sys/contrib/ipfilter/netinet/fil.c

   1 /*      $FreeBSD$       */
   2
   3 /*
   4  * Copyright (C) 2012 by Darren Reed.
   5  *
   6  * See the IPFILTER.LICENCE file for details on licencing.
   7  *
   8  * Copyright 2008 Sun Microsystems.
   9  *
  10  * $Id$
  11  *
  12  */
  13 #if defined(KERNEL) || defined(_KERNEL)
  14 # undef KERNEL
  15 # undef _KERNEL
  16 # define        KERNEL  1
  17 # define        _KERNEL 1
  18 #endif
  19 #include <sys/errno.h>
  20 #include <sys/types.h>
  21 #include <sys/param.h>
  22 #include <sys/time.h>
  23 #if defined(_KERNEL) && defined(__FreeBSD_version) && \
  24     (__FreeBSD_version >= 220000)
  25 # if (__FreeBSD_version >= 400000)
  26 #  if !defined(IPFILTER_LKM)
  27 #   include "opt_inet6.h"
  28 #  endif
  29 #  if (__FreeBSD_version == 400019)
  30 #   define CSUM_DELAY_DATA
  31 #  endif
  32 # endif
  33 # include <sys/filio.h>
  34 #else
  35 # include <sys/ioctl.h>
  36 #endif
  37 #if (defined(__SVR4) || defined(__svr4__)) && defined(sun)
  38 # include <sys/filio.h>
  39 #endif
  40 #if !defined(_AIX51)
  41 # include <sys/fcntl.h>
  42 #endif
  43 #if defined(_KERNEL)
  44 # include <sys/systm.h>
  45 # include <sys/file.h>
  46 #else
  47 # include <stdio.h>
  48 # include <string.h>
  49 # include <stdlib.h>
  50 # include <stddef.h>
  51 # include <sys/file.h>
  52 # define _KERNEL
  53 # ifdef __OpenBSD__
  54 struct file;
  55 # endif
  56 # include <sys/uio.h>
  57 # undef _KERNEL
  58 #endif
  59 #if !defined(__SVR4) && !defined(__svr4__) && !defined(__hpux) && \
  60     !defined(linux)
  61 # include <sys/mbuf.h>
  62 #else
  63 # if !defined(linux)
  64 #  include <sys/byteorder.h>
  65 # endif
  66 # if (SOLARIS2 < 5) && defined(sun)
  67 #  include <sys/dditypes.h>
  68 # endif
  69 #endif
  70 #ifdef __hpux
  71 # define _NET_ROUTE_INCLUDED
  72 #endif
  73 #if !defined(linux)
  74 # include <sys/protosw.h>
  75 #endif
  76 #include <sys/socket.h>
  77 #include <net/if.h>
  78 #ifdef sun
  79 # include <net/af.h>
  80 #endif
  81 #include <netinet/in.h>
  82 #include <netinet/in_systm.h>
  83 #include <netinet/ip.h>
  84 #if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
  85 # include <sys/hashing.h>
  86 # include <netinet/in_var.h>
  87 #endif
  88 #include <netinet/tcp.h>
  89 #if (!defined(__sgi) && !defined(AIX)) || defined(_KERNEL)
  90 # include <netinet/udp.h>
  91 # include <netinet/ip_icmp.h>
  92 #endif
  93 #ifdef __hpux
  94 # undef _NET_ROUTE_INCLUDED
  95 #endif
  96 #ifdef __osf__
  97 # undef _RADIX_H_
  98 #endif
  99 #include "netinet/ip_compat.h"
 100 #ifdef  USE_INET6
 101 # include <netinet/icmp6.h>
 102 # if !SOLARIS && defined(_KERNEL) && !defined(__osf__) && !defined(__hpux)
 103 #  include <netinet6/in6_var.h>
 104 # endif
 105 #endif
 106 #include "netinet/ip_fil.h"
 107 #include "netinet/ip_nat.h"
 108 #include "netinet/ip_frag.h"
 109 #include "netinet/ip_state.h"
 110 #include "netinet/ip_proxy.h"
 111 #include "netinet/ip_auth.h"
 112 #ifdef IPFILTER_SCAN
 113 # include "netinet/ip_scan.h"
 114 #endif
 115 #include "netinet/ip_sync.h"
 116 #include "netinet/ip_lookup.h"
 117 #include "netinet/ip_pool.h"
 118 #include "netinet/ip_htable.h"
 119 #ifdef IPFILTER_COMPILED
 120 # include "netinet/ip_rules.h"
 121 #endif
 122 #if defined(IPFILTER_BPF) && defined(_KERNEL)
 123 # include <net/bpf.h>
 124 #endif
 125 #if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
 126 # include <sys/malloc.h>
 127 #endif
 128 #include "netinet/ipl.h"
 129
 130 #if defined(__NetBSD__) && (__NetBSD_Version__ >= 104230000)
 131 # include <sys/callout.h>
 132 extern struct callout ipf_slowtimer_ch;
 133 #endif
 134 #if defined(__OpenBSD__)
 135 # include <sys/timeout.h>
 136 extern struct timeout ipf_slowtimer_ch;
 137 #endif
 138 /* END OF INCLUDES */
 139
 140 #if !defined(lint)
 141 static const char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-2000 Darren Reed";
 142 static const char rcsid[] = "@(#)$FreeBSD$";
 143 /* static const char rcsid[] = "@(#)$Id: fil.c,v 2.243.2.125 2007/10/10 09:27:20 darrenr Exp $"; */
 144 #endif
 145
 146 #ifndef _KERNEL
 147 # include "ipf.h"
 148 # include "ipt.h"
 149 extern  int     opts;
 150 extern  int     blockreason;
 151 #endif /* _KERNEL */
 152
 153 #define LBUMP(x)        softc->x++
 154 #define LBUMPD(x, y)    do { softc->x.y++; DT(y); } while (0)
 155
 156 static  INLINE int      ipf_check_ipf __P((fr_info_t *, frentry_t *, int));
 157 static  u_32_t          ipf_checkcipso __P((fr_info_t *, u_char *, int));
 158 static  u_32_t          ipf_checkripso __P((u_char *));
 159 static  u_32_t          ipf_decaps __P((fr_info_t *, u_32_t, int));
 160 #ifdef IPFILTER_LOG
 161 static  frentry_t       *ipf_dolog __P((fr_info_t *, u_32_t *));
 162 #endif
 163 static  int             ipf_flushlist __P((ipf_main_softc_t *, int *,
 164                                            frentry_t **));
 165 static  int             ipf_flush_groups __P((ipf_main_softc_t *, frgroup_t **,
 166                                               int));
 167 static  ipfunc_t        ipf_findfunc __P((ipfunc_t));
 168 static  void            *ipf_findlookup __P((ipf_main_softc_t *, int,
 169                                              frentry_t *,
 170                                              i6addr_t *, i6addr_t *));
 171 static  frentry_t       *ipf_firewall __P((fr_info_t *, u_32_t *));
 172 static  int             ipf_fr_matcharray __P((fr_info_t *, int *));
 173 static  int             ipf_frruleiter __P((ipf_main_softc_t *, void *, int,
 174                                             void *));
 175 static  void            ipf_funcfini __P((ipf_main_softc_t *, frentry_t *));
 176 static  int             ipf_funcinit __P((ipf_main_softc_t *, frentry_t *));
 177 static  int             ipf_geniter __P((ipf_main_softc_t *, ipftoken_t *,
 178                                          ipfgeniter_t *));
 179 static  void            ipf_getstat __P((ipf_main_softc_t *,
 180                                          struct friostat *, int));
 181 static  int             ipf_group_flush __P((ipf_main_softc_t *, frgroup_t *));
 182 static  void            ipf_group_free __P((frgroup_t *));
 183 static  int             ipf_grpmapfini __P((struct ipf_main_softc_s *,
 184                                             frentry_t *));
 185 static  int             ipf_grpmapinit __P((struct ipf_main_softc_s *,
 186                                             frentry_t *));
 187 static  frentry_t       *ipf_nextrule __P((ipf_main_softc_t *, int, int,
 188                                            frentry_t *, int));
 189 static  int             ipf_portcheck __P((frpcmp_t *, u_32_t));
 190 static  INLINE int      ipf_pr_ah __P((fr_info_t *));
 191 static  INLINE void     ipf_pr_esp __P((fr_info_t *));
 192 static  INLINE void     ipf_pr_gre __P((fr_info_t *));
 193 static  INLINE void     ipf_pr_udp __P((fr_info_t *));
 194 static  INLINE void     ipf_pr_tcp __P((fr_info_t *));
 195 static  INLINE void     ipf_pr_icmp __P((fr_info_t *));
 196 static  INLINE void     ipf_pr_ipv4hdr __P((fr_info_t *));
 197 static  INLINE void     ipf_pr_short __P((fr_info_t *, int));
 198 static  INLINE int      ipf_pr_tcpcommon __P((fr_info_t *));
 199 static  INLINE int      ipf_pr_udpcommon __P((fr_info_t *));
 200 static  void            ipf_rule_delete __P((ipf_main_softc_t *, frentry_t *f,
 201                                              int, int));
 202 static  void            ipf_rule_expire_insert __P((ipf_main_softc_t *,
 203                                                     frentry_t *, int));
 204 static  int             ipf_synclist __P((ipf_main_softc_t *, frentry_t *,
 205                                           void *));
 206 static  void            ipf_token_flush __P((ipf_main_softc_t *));
 207 static  void            ipf_token_unlink __P((ipf_main_softc_t *,
 208                                               ipftoken_t *));
 209 static  ipftuneable_t   *ipf_tune_findbyname __P((ipftuneable_t *,
 210                                                   const char *));
 211 static  ipftuneable_t   *ipf_tune_findbycookie __P((ipftuneable_t **, void *,
 212                                                     void **));
 213 static  int             ipf_updateipid __P((fr_info_t *));
 214 static  int             ipf_settimeout __P((struct ipf_main_softc_s *,
 215                                             struct ipftuneable *,
 216                                             ipftuneval_t *));
 217 #if !defined(_KERNEL) || (!defined(__NetBSD__) && !defined(__OpenBSD__) && \
 218      !defined(__FreeBSD__)) || \
 219     FREEBSD_LT_REV(501000) || NETBSD_LT_REV(105000000) || \
 220     OPENBSD_LT_REV(200006)
 221 static  int             ppsratecheck(struct timeval *, int *, int);
 222 #endif
 223
 224
 225 /*
 226  * bit values for identifying presence of individual IP options
 227  * All of these tables should be ordered by increasing key value on the left
 228  * hand side to allow for binary searching of the array and include a trailer
 229  * with a 0 for the bitmask for linear searches to easily find the end with.
 230  */
 231 static const    struct  optlist ipopts[20] = {
 232         { IPOPT_NOP,    0x000001 },
 233         { IPOPT_RR,     0x000002 },
 234         { IPOPT_ZSU,    0x000004 },
 235         { IPOPT_MTUP,   0x000008 },
 236         { IPOPT_MTUR,   0x000010 },
 237         { IPOPT_ENCODE, 0x000020 },
 238         { IPOPT_TS,     0x000040 },
 239         { IPOPT_TR,     0x000080 },
 240         { IPOPT_SECURITY, 0x000100 },
 241         { IPOPT_LSRR,   0x000200 },
 242         { IPOPT_E_SEC,  0x000400 },
 243         { IPOPT_CIPSO,  0x000800 },
 244         { IPOPT_SATID,  0x001000 },
 245         { IPOPT_SSRR,   0x002000 },
 246         { IPOPT_ADDEXT, 0x004000 },
 247         { IPOPT_VISA,   0x008000 },
 248         { IPOPT_IMITD,  0x010000 },
 249         { IPOPT_EIP,    0x020000 },
 250         { IPOPT_FINN,   0x040000 },
 251         { 0,            0x000000 }
 252 };
 253
 254 #ifdef USE_INET6
 255 static const struct optlist ip6exthdr[] = {
 256         { IPPROTO_HOPOPTS,              0x000001 },
 257         { IPPROTO_IPV6,                 0x000002 },
 258         { IPPROTO_ROUTING,              0x000004 },
 259         { IPPROTO_FRAGMENT,             0x000008 },
 260         { IPPROTO_ESP,                  0x000010 },
 261         { IPPROTO_AH,                   0x000020 },
 262         { IPPROTO_NONE,                 0x000040 },
 263         { IPPROTO_DSTOPTS,              0x000080 },
 264         { IPPROTO_MOBILITY,             0x000100 },
 265         { 0,                            0 }
 266 };
 267 #endif
 268
 269 /*
 270  * bit values for identifying presence of individual IP security options
 271  */
 272 static const    struct  optlist secopt[8] = {
 273         { IPSO_CLASS_RES4,      0x01 },
 274         { IPSO_CLASS_TOPS,      0x02 },
 275         { IPSO_CLASS_SECR,      0x04 },
 276         { IPSO_CLASS_RES3,      0x08 },
 277         { IPSO_CLASS_CONF,      0x10 },
 278         { IPSO_CLASS_UNCL,      0x20 },
 279         { IPSO_CLASS_RES2,      0x40 },
 280         { IPSO_CLASS_RES1,      0x80 }
 281 };
 282
 283 char    ipfilter_version[] = IPL_VERSION;
 284
 285 int     ipf_features = 0
 286 #ifdef  IPFILTER_LKM
 287                 | IPF_FEAT_LKM
 288 #endif
 289 #ifdef  IPFILTER_LOG
 290                 | IPF_FEAT_LOG
 291 #endif
 292                 | IPF_FEAT_LOOKUP
 293 #ifdef  IPFILTER_BPF
 294                 | IPF_FEAT_BPF
 295 #endif
 296 #ifdef  IPFILTER_COMPILED
 297                 | IPF_FEAT_COMPILED
 298 #endif
 299 #ifdef  IPFILTER_CKSUM
 300                 | IPF_FEAT_CKSUM
 301 #endif
 302                 | IPF_FEAT_SYNC
 303 #ifdef  IPFILTER_SCAN
 304                 | IPF_FEAT_SCAN
 305 #endif
 306 #ifdef  USE_INET6
 307                 | IPF_FEAT_IPV6
 308 #endif
 309         ;
 310
 311
 312 /*
 313  * Table of functions available for use with call rules.
 314  */
 315 static ipfunc_resolve_t ipf_availfuncs[] = {
 316         { "srcgrpmap", ipf_srcgrpmap, ipf_grpmapinit, ipf_grpmapfini },
 317         { "dstgrpmap", ipf_dstgrpmap, ipf_grpmapinit, ipf_grpmapfini },
 318         { "",         NULL,           NULL,           NULL }
 319 };
 320
 321 static ipftuneable_t ipf_main_tuneables[] = {
 322         { { (void *)offsetof(struct ipf_main_softc_s, ipf_flags) },
 323                 "ipf_flags",            0,      0xffffffff,
 324                 stsizeof(ipf_main_softc_t, ipf_flags),
 325                 0,                      NULL,   NULL },
 326         { { (void *)offsetof(struct ipf_main_softc_s, ipf_active) },
 327                 "active",               0,      0,
 328                 stsizeof(ipf_main_softc_t, ipf_active),
 329                 IPFT_RDONLY,            NULL,   NULL },
 330         { { (void *)offsetof(ipf_main_softc_t, ipf_control_forwarding) },
 331                 "control_forwarding",   0, 1,
 332                 stsizeof(ipf_main_softc_t, ipf_control_forwarding),
 333                 0,                      NULL,   NULL },
 334         { { (void *)offsetof(ipf_main_softc_t, ipf_update_ipid) },
 335                 "update_ipid",          0,      1,
 336                 stsizeof(ipf_main_softc_t, ipf_update_ipid),
 337                 0,                      NULL,   NULL },
 338         { { (void *)offsetof(ipf_main_softc_t, ipf_chksrc) },
 339                 "chksrc",               0,      1,
 340                 stsizeof(ipf_main_softc_t, ipf_chksrc),
 341                 0,                      NULL,   NULL },
 342         { { (void *)offsetof(ipf_main_softc_t, ipf_minttl) },
 343                 "min_ttl",              0,      1,
 344                 stsizeof(ipf_main_softc_t, ipf_minttl),
 345                 0,                      NULL,   NULL },
 346         { { (void *)offsetof(ipf_main_softc_t, ipf_icmpminfragmtu) },
 347                 "icmp_minfragmtu",      0,      1,
 348                 stsizeof(ipf_main_softc_t, ipf_icmpminfragmtu),
 349                 0,                      NULL,   NULL },
 350         { { (void *)offsetof(ipf_main_softc_t, ipf_pass) },
 351                 "default_pass",         0,      0xffffffff,
 352                 stsizeof(ipf_main_softc_t, ipf_pass),
 353                 0,                      NULL,   NULL },
 354         { { (void *)offsetof(ipf_main_softc_t, ipf_tcpidletimeout) },
 355                 "tcp_idle_timeout",     1,      0x7fffffff,
 356                 stsizeof(ipf_main_softc_t, ipf_tcpidletimeout),
 357                 0,                      NULL,   ipf_settimeout },
 358         { { (void *)offsetof(ipf_main_softc_t, ipf_tcpclosewait) },
 359                 "tcp_close_wait",       1,      0x7fffffff,
 360                 stsizeof(ipf_main_softc_t, ipf_tcpclosewait),
 361                 0,                      NULL,   ipf_settimeout },
 362         { { (void *)offsetof(ipf_main_softc_t, ipf_tcplastack) },
 363                 "tcp_last_ack",         1,      0x7fffffff,
 364                 stsizeof(ipf_main_softc_t, ipf_tcplastack),
 365                 0,                      NULL,   ipf_settimeout },
 366         { { (void *)offsetof(ipf_main_softc_t, ipf_tcptimeout) },
 367                 "tcp_timeout",          1,      0x7fffffff,
 368                 stsizeof(ipf_main_softc_t, ipf_tcptimeout),
 369                 0,                      NULL,   ipf_settimeout },
 370         { { (void *)offsetof(ipf_main_softc_t, ipf_tcpsynsent) },
 371                 "tcp_syn_sent",         1,      0x7fffffff,
 372                 stsizeof(ipf_main_softc_t, ipf_tcpsynsent),
 373                 0,                      NULL,   ipf_settimeout },
 374         { { (void *)offsetof(ipf_main_softc_t, ipf_tcpsynrecv) },
 375                 "tcp_syn_received",     1,      0x7fffffff,
 376                 stsizeof(ipf_main_softc_t, ipf_tcpsynrecv),
 377                 0,                      NULL,   ipf_settimeout },
 378         { { (void *)offsetof(ipf_main_softc_t, ipf_tcpclosed) },
 379                 "tcp_closed",           1,      0x7fffffff,
 380                 stsizeof(ipf_main_softc_t, ipf_tcpclosed),
 381                 0,                      NULL,   ipf_settimeout },
 382         { { (void *)offsetof(ipf_main_softc_t, ipf_tcphalfclosed) },
 383                 "tcp_half_closed",      1,      0x7fffffff,
 384                 stsizeof(ipf_main_softc_t, ipf_tcphalfclosed),
 385                 0,                      NULL,   ipf_settimeout },
 386         { { (void *)offsetof(ipf_main_softc_t, ipf_tcptimewait) },
 387                 "tcp_time_wait",        1,      0x7fffffff,
 388                 stsizeof(ipf_main_softc_t, ipf_tcptimewait),
 389                 0,                      NULL,   ipf_settimeout },
 390         { { (void *)offsetof(ipf_main_softc_t, ipf_udptimeout) },
 391                 "udp_timeout",          1,      0x7fffffff,
 392                 stsizeof(ipf_main_softc_t, ipf_udptimeout),
 393                 0,                      NULL,   ipf_settimeout },
 394         { { (void *)offsetof(ipf_main_softc_t, ipf_udpacktimeout) },
 395                 "udp_ack_timeout",      1,      0x7fffffff,
 396                 stsizeof(ipf_main_softc_t, ipf_udpacktimeout),
 397                 0,                      NULL,   ipf_settimeout },
 398         { { (void *)offsetof(ipf_main_softc_t, ipf_icmptimeout) },
 399                 "icmp_timeout",         1,      0x7fffffff,
 400                 stsizeof(ipf_main_softc_t, ipf_icmptimeout),
 401                 0,                      NULL,   ipf_settimeout },
 402         { { (void *)offsetof(ipf_main_softc_t, ipf_icmpacktimeout) },
 403                 "icmp_ack_timeout",     1,      0x7fffffff,
 404                 stsizeof(ipf_main_softc_t, ipf_icmpacktimeout),
 405                 0,                      NULL,   ipf_settimeout },
 406         { { (void *)offsetof(ipf_main_softc_t, ipf_iptimeout) },
 407                 "ip_timeout",           1,      0x7fffffff,
 408                 stsizeof(ipf_main_softc_t, ipf_iptimeout),
 409                 0,                      NULL,   ipf_settimeout },
 410 #if defined(INSTANCES) && defined(_KERNEL)
 411         { { (void *)offsetof(ipf_main_softc_t, ipf_get_loopback) },
 412                 "intercept_loopback",   0,      1,
 413                 stsizeof(ipf_main_softc_t, ipf_get_loopback),
 414                 0,                      NULL,   ipf_set_loopback },
 415 #endif
 416         { { 0 },
 417                 NULL,                   0,      0,
 418                 0,
 419                 0,                      NULL,   NULL }
 420 };
 421
 422
 423 /*
 424  * The next section of code is a collection of small routines that set
 425  * fields in the fr_info_t structure passed based on properties of the
 426  * current packet.  There are different routines for the same protocol
 427  * for each of IPv4 and IPv6.  Adding a new protocol, for which there
 428  * will "special" inspection for setup, is now more easily done by adding
 429  * a new routine and expanding the ipf_pr_ipinit*() function rather than by
 430  * adding more code to a growing switch statement.
 431  */
 432 #ifdef USE_INET6
 433 static  INLINE int      ipf_pr_ah6 __P((fr_info_t *));
 434 static  INLINE void     ipf_pr_esp6 __P((fr_info_t *));
 435 static  INLINE void     ipf_pr_gre6 __P((fr_info_t *));
 436 static  INLINE void     ipf_pr_udp6 __P((fr_info_t *));
 437 static  INLINE void     ipf_pr_tcp6 __P((fr_info_t *));
 438 static  INLINE void     ipf_pr_icmp6 __P((fr_info_t *));
 439 static  INLINE void     ipf_pr_ipv6hdr __P((fr_info_t *));
 440 static  INLINE void     ipf_pr_short6 __P((fr_info_t *, int));
 441 static  INLINE int      ipf_pr_hopopts6 __P((fr_info_t *));
 442 static  INLINE int      ipf_pr_mobility6 __P((fr_info_t *));
 443 static  INLINE int      ipf_pr_routing6 __P((fr_info_t *));
 444 static  INLINE int      ipf_pr_dstopts6 __P((fr_info_t *));
 445 static  INLINE int      ipf_pr_fragment6 __P((fr_info_t *));
 446 static  INLINE struct ip6_ext *ipf_pr_ipv6exthdr __P((fr_info_t *, int, int));
 447
 448
 449 /* ------------------------------------------------------------------------ */
 450 /* Function:    ipf_pr_short6                                               */
 451 /* Returns:     void                                                        */
 452 /* Parameters:  fin(I)  - pointer to packet information                     */
 453 /*              xmin(I) - minimum header size                               */
 454 /*                                                                          */
 455 /* IPv6 Only                                                                */
 456 /* This is function enforces the 'is a packet too short to be legit' rule   */
 457 /* for IPv6 and marks the packet with FI_SHORT if so.  See function comment */
 458 /* for ipf_pr_short() for more details.                                     */
 459 /* ------------------------------------------------------------------------ */
 460 static INLINE void
 461 ipf_pr_short6(fin, xmin)
 462         fr_info_t *fin;
 463         int xmin;
 464 {
 465
 466         if (fin->fin_dlen < xmin)
 467                 fin->fin_flx |= FI_SHORT;
 468 }
 469
 470
 471 /* ------------------------------------------------------------------------ */
 472 /* Function:    ipf_pr_ipv6hdr                                              */
 473 /* Returns:     void                                                        */
 474 /* Parameters:  fin(I) - pointer to packet information                      */
 475 /*                                                                          */
 476 /* IPv6 Only                                                                */
 477 /* Copy values from the IPv6 header into the fr_info_t struct and call the  */
 478 /* per-protocol analyzer if it exists.  In validating the packet, a protocol*/
 479 /* analyzer may pullup or free the packet itself so we need to be vigiliant */
 480 /* of that possibility arising.                                             */
 481 /* ------------------------------------------------------------------------ */
 482 static INLINE void
 483 ipf_pr_ipv6hdr(fin)
 484         fr_info_t *fin;
 485 {
 486         ip6_t *ip6 = (ip6_t *)fin->fin_ip;
 487         int p, go = 1, i, hdrcount;
 488         fr_ip_t *fi = &fin->fin_fi;
 489
 490         fin->fin_off = 0;
 491
 492         fi->fi_tos = 0;
 493         fi->fi_optmsk = 0;
 494         fi->fi_secmsk = 0;
 495         fi->fi_auth = 0;
 496
 497         p = ip6->ip6_nxt;
 498         fin->fin_crc = p;
 499         fi->fi_ttl = ip6->ip6_hlim;
 500         fi->fi_src.in6 = ip6->ip6_src;
 501         fin->fin_crc += fi->fi_src.i6[0];
 502         fin->fin_crc += fi->fi_src.i6[1];
 503         fin->fin_crc += fi->fi_src.i6[2];
 504         fin->fin_crc += fi->fi_src.i6[3];
 505         fi->fi_dst.in6 = ip6->ip6_dst;
 506         fin->fin_crc += fi->fi_dst.i6[0];
 507         fin->fin_crc += fi->fi_dst.i6[1];
 508         fin->fin_crc += fi->fi_dst.i6[2];
 509         fin->fin_crc += fi->fi_dst.i6[3];
 510         fin->fin_id = 0;
 511         if (IN6_IS_ADDR_MULTICAST(&fi->fi_dst.in6))
 512                 fin->fin_flx |= FI_MULTICAST|FI_MBCAST;
 513
 514         hdrcount = 0;
 515         while (go && !(fin->fin_flx & FI_SHORT)) {
 516                 switch (p)
 517                 {
 518                 case IPPROTO_UDP :
 519                         ipf_pr_udp6(fin);
 520                         go = 0;
 521                         break;
 522
 523                 case IPPROTO_TCP :
 524                         ipf_pr_tcp6(fin);
 525                         go = 0;
 526                         break;
 527
 528                 case IPPROTO_ICMPV6 :
 529                         ipf_pr_icmp6(fin);
 530                         go = 0;
 531                         break;
 532
 533                 case IPPROTO_GRE :
 534                         ipf_pr_gre6(fin);
 535                         go = 0;
 536                         break;
 537
 538                 case IPPROTO_HOPOPTS :
 539                         p = ipf_pr_hopopts6(fin);
 540                         break;
 541
 542                 case IPPROTO_MOBILITY :
 543                         p = ipf_pr_mobility6(fin);
 544                         break;
 545
 546                 case IPPROTO_DSTOPTS :
 547                         p = ipf_pr_dstopts6(fin);
 548                         break;
 549
 550                 case IPPROTO_ROUTING :
 551                         p = ipf_pr_routing6(fin);
 552                         break;
 553
 554                 case IPPROTO_AH :
 555                         p = ipf_pr_ah6(fin);
 556                         break;
 557
 558                 case IPPROTO_ESP :
 559                         ipf_pr_esp6(fin);
 560                         go = 0;
 561                         break;
 562
 563                 case IPPROTO_IPV6 :
 564                         for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
 565                                 if (ip6exthdr[i].ol_val == p) {
 566                                         fin->fin_flx |= ip6exthdr[i].ol_bit;
 567                                         break;
 568                                 }
 569                         go = 0;
 570                         break;
 571
 572                 case IPPROTO_NONE :
 573                         go = 0;
 574                         break;
 575
 576                 case IPPROTO_FRAGMENT :
 577                         p = ipf_pr_fragment6(fin);
 578                         /*
 579                          * Given that the only fragments we want to let through
 580                          * (where fin_off != 0) are those where the non-first
 581                          * fragments only have data, we can safely stop looking
 582                          * at headers if this is a non-leading fragment.
 583                          */
 584                         if (fin->fin_off != 0)
 585                                 go = 0;
 586                         break;
 587
 588                 default :
 589                         go = 0;
 590                         break;
 591                 }
 592                 hdrcount++;
 593
 594                 /*
 595                  * It is important to note that at this point, for the
 596                  * extension headers (go != 0), the entire header may not have
 597                  * been pulled up when the code gets to this point.  This is
 598                  * only done for "go != 0" because the other header handlers
 599                  * will all pullup their complete header.  The other indicator
 600                  * of an incomplete packet is that this was just an extension
 601                  * header.
 602                  */
 603                 if ((go != 0) && (p != IPPROTO_NONE) &&
 604                     (ipf_pr_pullup(fin, 0) == -1)) {
 605                         p = IPPROTO_NONE;
 606                         break;
 607                 }
 608         }
 609
 610         /*
 611          * Some of the above functions, like ipf_pr_esp6(), can call ipf_pullup
 612          * and destroy whatever packet was here.  The caller of this function
 613          * expects us to return if there is a problem with ipf_pullup.
 614          */
 615         if (fin->fin_m == NULL) {
 616                 ipf_main_softc_t *softc = fin->fin_main_soft;
 617
 618                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_bad);
 619                 return;
 620         }
 621
 622         fi->fi_p = p;
 623
 624         /*
 625          * IPv6 fragment case 1 - see comment for ipf_pr_fragment6().
 626          * "go != 0" imples the above loop hasn't arrived at a layer 4 header.
 627          */
 628         if ((go != 0) && (fin->fin_flx & FI_FRAG) && (fin->fin_off == 0)) {
 629                 ipf_main_softc_t *softc = fin->fin_main_soft;
 630
 631                 fin->fin_flx |= FI_BAD;
 632                 DT2(ipf_fi_bad_ipv6_frag_1, fr_info_t *, fin, int, go);
 633                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_badfrag);
 634                 LBUMP(ipf_stats[fin->fin_out].fr_v6_bad);
 635         }
 636 }
 637
 638
 639 /* ------------------------------------------------------------------------ */
 640 /* Function:    ipf_pr_ipv6exthdr                                           */
 641 /* Returns:     struct ip6_ext * - pointer to the start of the next header  */
 642 /*                                 or NULL if there is a prolblem.          */
 643 /* Parameters:  fin(I)      - pointer to packet information                 */
 644 /*              multiple(I) - flag indicating yes/no if multiple occurances */
 645 /*                            of this extension header are allowed.         */
 646 /*              proto(I)    - protocol number for this extension header     */
 647 /*                                                                          */
 648 /* IPv6 Only                                                                */
 649 /* This function embodies a number of common checks that all IPv6 extension */
 650 /* headers must be subjected to.  For example, making sure the packet is    */
 651 /* big enough for it to be in, checking if it is repeated and setting a     */
 652 /* flag to indicate its presence.                                           */
 653 /* ------------------------------------------------------------------------ */
 654 static INLINE struct ip6_ext *
 655 ipf_pr_ipv6exthdr(fin, multiple, proto)
 656         fr_info_t *fin;
 657         int multiple, proto;
 658 {
 659         ipf_main_softc_t *softc = fin->fin_main_soft;
 660         struct ip6_ext *hdr;
 661         u_short shift;
 662         int i;
 663
 664         fin->fin_flx |= FI_V6EXTHDR;
 665
 666                                 /* 8 is default length of extension hdr */
 667         if ((fin->fin_dlen - 8) < 0) {
 668                 fin->fin_flx |= FI_SHORT;
 669                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_short);
 670                 return NULL;
 671         }
 672
 673         if (ipf_pr_pullup(fin, 8) == -1) {
 674                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_pullup);
 675                 return NULL;
 676         }
 677
 678         hdr = fin->fin_dp;
 679         switch (proto)
 680         {
 681         case IPPROTO_FRAGMENT :
 682                 shift = 8;
 683                 break;
 684         default :
 685                 shift = 8 + (hdr->ip6e_len << 3);
 686                 break;
 687         }
 688
 689         if (shift > fin->fin_dlen) {    /* Nasty extension header length? */
 690                 fin->fin_flx |= FI_BAD;
 691                 DT3(ipf_fi_bad_pr_ipv6exthdr_len, fr_info_t *, fin, u_short, shift, u_short, fin->fin_dlen);
 692                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_hlen);
 693                 return NULL;
 694         }
 695
 696         fin->fin_dp = (char *)fin->fin_dp + shift;
 697         fin->fin_dlen -= shift;
 698
 699         /*
 700          * If we have seen a fragment header, do not set any flags to indicate
 701          * the presence of this extension header as it has no impact on the
 702          * end result until after it has been defragmented.
 703          */
 704         if (fin->fin_flx & FI_FRAG)
 705                 return hdr;
 706
 707         for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
 708                 if (ip6exthdr[i].ol_val == proto) {
 709                         /*
 710                          * Most IPv6 extension headers are only allowed once.
 711                          */
 712                         if ((multiple == 0) &&
 713                             ((fin->fin_optmsk & ip6exthdr[i].ol_bit) != 0)) {
 714                                 fin->fin_flx |= FI_BAD;
 715                                 DT2(ipf_fi_bad_ipv6exthdr_once, fr_info_t *, fin, u_int, (fin->fin_optmsk & ip6exthdr[i].ol_bit));
 716                         } else
 717                                 fin->fin_optmsk |= ip6exthdr[i].ol_bit;
 718                         break;
 719                 }
 720
 721         return hdr;
 722 }
 723
 724
 725 /* ------------------------------------------------------------------------ */
 726 /* Function:    ipf_pr_hopopts6                                             */
 727 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 728 /* Parameters:  fin(I) - pointer to packet information                      */
 729 /*                                                                          */
 730 /* IPv6 Only                                                                */
 731 /* This is function checks pending hop by hop options extension header      */
 732 /* ------------------------------------------------------------------------ */
 733 static INLINE int
 734 ipf_pr_hopopts6(fin)
 735         fr_info_t *fin;
 736 {
 737         struct ip6_ext *hdr;
 738
 739         hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_HOPOPTS);
 740         if (hdr == NULL)
 741                 return IPPROTO_NONE;
 742         return hdr->ip6e_nxt;
 743 }
 744
 745
 746 /* ------------------------------------------------------------------------ */
 747 /* Function:    ipf_pr_mobility6                                            */
 748 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 749 /* Parameters:  fin(I) - pointer to packet information                      */
 750 /*                                                                          */
 751 /* IPv6 Only                                                                */
 752 /* This is function checks the IPv6 mobility extension header               */
 753 /* ------------------------------------------------------------------------ */
 754 static INLINE int
 755 ipf_pr_mobility6(fin)
 756         fr_info_t *fin;
 757 {
 758         struct ip6_ext *hdr;
 759
 760         hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_MOBILITY);
 761         if (hdr == NULL)
 762                 return IPPROTO_NONE;
 763         return hdr->ip6e_nxt;
 764 }
 765
 766
 767 /* ------------------------------------------------------------------------ */
 768 /* Function:    ipf_pr_routing6                                             */
 769 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 770 /* Parameters:  fin(I) - pointer to packet information                      */
 771 /*                                                                          */
 772 /* IPv6 Only                                                                */
 773 /* This is function checks pending routing extension header                 */
 774 /* ------------------------------------------------------------------------ */
 775 static INLINE int
 776 ipf_pr_routing6(fin)
 777         fr_info_t *fin;
 778 {
 779         struct ip6_routing *hdr;
 780
 781         hdr = (struct ip6_routing *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_ROUTING);
 782         if (hdr == NULL)
 783                 return IPPROTO_NONE;
 784
 785         switch (hdr->ip6r_type)
 786         {
 787         case 0 :
 788                 /*
 789                  * Nasty extension header length?
 790                  */
 791                 if (((hdr->ip6r_len >> 1) < hdr->ip6r_segleft) ||
 792                     (hdr->ip6r_segleft && (hdr->ip6r_len & 1))) {
 793                         ipf_main_softc_t *softc = fin->fin_main_soft;
 794
 795                         fin->fin_flx |= FI_BAD;
 796                         DT1(ipf_fi_bad_routing6, fr_info_t *, fin);
 797                         LBUMPD(ipf_stats[fin->fin_out], fr_v6_rh_bad);
 798                         return IPPROTO_NONE;
 799                 }
 800                 break;
 801
 802         default :
 803                 break;
 804         }
 805
 806         return hdr->ip6r_nxt;
 807 }
 808
 809
 810 /* ------------------------------------------------------------------------ */
 811 /* Function:    ipf_pr_fragment6                                            */
 812 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 813 /* Parameters:  fin(I) - pointer to packet information                      */
 814 /*                                                                          */
 815 /* IPv6 Only                                                                */
 816 /* Examine the IPv6 fragment header and extract fragment offset information.*/
 817 /*                                                                          */
 818 /* Fragments in IPv6 are extraordinarily difficult to deal with - much more */
 819 /* so than in IPv4.  There are 5 cases of fragments with IPv6 that all      */
 820 /* packets with a fragment header can fit into.  They are as follows:       */
 821 /*                                                                          */
 822 /* 1.  [IPv6][0-n EH][FH][0-n EH] (no L4HDR present)                        */
 823 /* 2.  [IPV6][0-n EH][FH][0-n EH][L4HDR part] (short)                       */
 824 /* 3.  [IPV6][0-n EH][FH][L4HDR part][0-n data] (short)                     */
 825 /* 4.  [IPV6][0-n EH][FH][0-n EH][L4HDR][0-n data]                          */
 826 /* 5.  [IPV6][0-n EH][FH][data]                                             */
 827 /*                                                                          */
 828 /* IPV6 = IPv6 header, FH = Fragment Header,                                */
 829 /* 0-n EH = 0 or more extension headers, 0-n data = 0 or more bytes of data */
 830 /*                                                                          */
 831 /* Packets that match 1, 2, 3 will be dropped as the only reasonable        */
 832 /* scenario in which they happen is in extreme circumstances that are most  */
 833 /* likely to be an indication of an attack rather than normal traffic.      */
 834 /* A type 3 packet may be sent by an attacked after a type 4 packet.  There */
 835 /* are two rules that can be used to guard against type 3 packets: L4       */
 836 /* headers must always be in a packet that has the offset field set to 0    */
 837 /* and no packet is allowed to overlay that where offset = 0.               */
 838 /* ------------------------------------------------------------------------ */
 839 static INLINE int
 840 ipf_pr_fragment6(fin)
 841         fr_info_t *fin;
 842 {
 843         ipf_main_softc_t *softc = fin->fin_main_soft;
 844         struct ip6_frag *frag;
 845
 846         fin->fin_flx |= FI_FRAG;
 847
 848         frag = (struct ip6_frag *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_FRAGMENT);
 849         if (frag == NULL) {
 850                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_frag_bad);
 851                 return IPPROTO_NONE;
 852         }
 853
 854         if ((frag->ip6f_offlg & IP6F_MORE_FRAG) != 0) {
 855                 /*
 856                  * Any fragment that isn't the last fragment must have its
 857                  * length as a multiple of 8.
 858                  */
 859                 if ((fin->fin_plen & 7) != 0) {
 860                         fin->fin_flx |= FI_BAD;
 861                         DT2(ipf_fi_bad_frag_not_8, fr_info_t *, fin, u_int, (fin->fin_plen & 7));
 862                 }
 863         }
 864
 865         fin->fin_fraghdr = frag;
 866         fin->fin_id = frag->ip6f_ident;
 867         fin->fin_off = ntohs(frag->ip6f_offlg & IP6F_OFF_MASK);
 868         if (fin->fin_off != 0)
 869                 fin->fin_flx |= FI_FRAGBODY;
 870
 871         /*
 872          * Jumbograms aren't handled, so the max. length is 64k
 873          */
 874         if ((fin->fin_off << 3) + fin->fin_dlen > 65535) {
 875                   fin->fin_flx |= FI_BAD;
 876                   DT2(ipf_fi_bad_jumbogram, fr_info_t *, fin, u_int, ((fin->fin_off << 3) + fin->fin_dlen));
 877         }
 878
 879         /*
 880          * We don't know where the transport layer header (or whatever is next
 881          * is), as it could be behind destination options (amongst others) so
 882          * return the fragment header as the type of packet this is.  Note that
 883          * this effectively disables the fragment cache for > 1 protocol at a
 884          * time.
 885          */
 886         return frag->ip6f_nxt;
 887 }
 888
 889
 890 /* ------------------------------------------------------------------------ */
 891 /* Function:    ipf_pr_dstopts6                                             */
 892 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 893 /* Parameters:  fin(I) - pointer to packet information                      */
 894 /*                                                                          */
 895 /* IPv6 Only                                                                */
 896 /* This is function checks pending destination options extension header     */
 897 /* ------------------------------------------------------------------------ */
 898 static INLINE int
 899 ipf_pr_dstopts6(fin)
 900         fr_info_t *fin;
 901 {
 902         ipf_main_softc_t *softc = fin->fin_main_soft;
 903         struct ip6_ext *hdr;
 904
 905         hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_DSTOPTS);
 906         if (hdr == NULL) {
 907                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_dst_bad);
 908                 return IPPROTO_NONE;
 909         }
 910         return hdr->ip6e_nxt;
 911 }
 912
 913
 914 /* ------------------------------------------------------------------------ */
 915 /* Function:    ipf_pr_icmp6                                                */
 916 /* Returns:     void                                                        */
 917 /* Parameters:  fin(I) - pointer to packet information                      */
 918 /*                                                                          */
 919 /* IPv6 Only                                                                */
 920 /* This routine is mainly concerned with determining the minimum valid size */
 921 /* for an ICMPv6 packet.                                                    */
 922 /* ------------------------------------------------------------------------ */
 923 static INLINE void
 924 ipf_pr_icmp6(fin)
 925         fr_info_t *fin;
 926 {
 927         int minicmpsz = sizeof(struct icmp6_hdr);
 928         struct icmp6_hdr *icmp6;
 929
 930         if (ipf_pr_pullup(fin, ICMP6ERR_MINPKTLEN - sizeof(ip6_t)) == -1) {
 931                 ipf_main_softc_t *softc = fin->fin_main_soft;
 932
 933                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_icmp6_pullup);
 934                 return;
 935         }
 936
 937         if (fin->fin_dlen > 1) {
 938                 ip6_t *ip6;
 939
 940                 icmp6 = fin->fin_dp;
 941
 942                 fin->fin_data[0] = *(u_short *)icmp6;
 943
 944                 if ((icmp6->icmp6_type & ICMP6_INFOMSG_MASK) != 0)
 945                         fin->fin_flx |= FI_ICMPQUERY;
 946
 947                 switch (icmp6->icmp6_type)
 948                 {
 949                 case ICMP6_ECHO_REPLY :
 950                 case ICMP6_ECHO_REQUEST :
 951                         if (fin->fin_dlen >= 6)
 952                                 fin->fin_data[1] = icmp6->icmp6_id;
 953                         minicmpsz = ICMP6ERR_MINPKTLEN - sizeof(ip6_t);
 954                         break;
 955
 956                 case ICMP6_DST_UNREACH :
 957                 case ICMP6_PACKET_TOO_BIG :
 958                 case ICMP6_TIME_EXCEEDED :
 959                 case ICMP6_PARAM_PROB :
 960                         fin->fin_flx |= FI_ICMPERR;
 961                         minicmpsz = ICMP6ERR_IPICMPHLEN - sizeof(ip6_t);
 962                         if (fin->fin_plen < ICMP6ERR_IPICMPHLEN)
 963                                 break;
 964
 965                         if (M_LEN(fin->fin_m) < fin->fin_plen) {
 966                                 if (ipf_coalesce(fin) != 1)
 967                                         return;
 968                         }
 969
 970                         if (ipf_pr_pullup(fin, ICMP6ERR_MINPKTLEN) == -1)
 971                                 return;
 972
 973                         /*
 974                          * If the destination of this packet doesn't match the
 975                          * source of the original packet then this packet is
 976                          * not correct.
 977                          */
 978                         icmp6 = fin->fin_dp;
 979                         ip6 = (ip6_t *)((char *)icmp6 + ICMPERR_ICMPHLEN);
 980                         if (IP6_NEQ(&fin->fin_fi.fi_dst,
 981                                     (i6addr_t *)&ip6->ip6_src)) {
 982                                 fin->fin_flx |= FI_BAD;
 983                                 DT1(ipf_fi_bad_icmp6, fr_info_t *, fin);
 984                         }
 985                         break;
 986                 default :
 987                         break;
 988                 }
 989         }
 990
 991         ipf_pr_short6(fin, minicmpsz);
 992         if ((fin->fin_flx & (FI_SHORT|FI_BAD)) == 0) {
 993                 u_char p = fin->fin_p;
 994
 995                 fin->fin_p = IPPROTO_ICMPV6;
 996                 ipf_checkv6sum(fin);
 997                 fin->fin_p = p;
 998         }
 999 }
1000
1001
1002 /* ------------------------------------------------------------------------ */
1003 /* Function:    ipf_pr_udp6                                                 */
1004 /* Returns:     void                                                        */
1005 /* Parameters:  fin(I) - pointer to packet information                      */
1006 /*                                                                          */
1007 /* IPv6 Only                                                                */
1008 /* Analyse the packet for IPv6/UDP properties.                              */
1009 /* Is not expected to be called for fragmented packets.                     */
1010 /* ------------------------------------------------------------------------ */
1011 static INLINE void
1012 ipf_pr_udp6(fin)
1013         fr_info_t *fin;
1014 {
1015
1016         if (ipf_pr_udpcommon(fin) == 0) {
1017                 u_char p = fin->fin_p;
1018
1019                 fin->fin_p = IPPROTO_UDP;
1020                 ipf_checkv6sum(fin);
1021                 fin->fin_p = p;
1022         }
1023 }
1024
1025
1026 /* ------------------------------------------------------------------------ */
1027 /* Function:    ipf_pr_tcp6                                                 */
1028 /* Returns:     void                                                        */
1029 /* Parameters:  fin(I) - pointer to packet information                      */
1030 /*                                                                          */
1031 /* IPv6 Only                                                                */
1032 /* Analyse the packet for IPv6/TCP properties.                              */
1033 /* Is not expected to be called for fragmented packets.                     */
1034 /* ------------------------------------------------------------------------ */
1035 static INLINE void
1036 ipf_pr_tcp6(fin)
1037         fr_info_t *fin;
1038 {
1039
1040         if (ipf_pr_tcpcommon(fin) == 0) {
1041                 u_char p = fin->fin_p;
1042
1043                 fin->fin_p = IPPROTO_TCP;
1044                 ipf_checkv6sum(fin);
1045                 fin->fin_p = p;
1046         }
1047 }
1048
1049
1050 /* ------------------------------------------------------------------------ */
1051 /* Function:    ipf_pr_esp6                                                 */
1052 /* Returns:     void                                                        */
1053 /* Parameters:  fin(I) - pointer to packet information                      */
1054 /*                                                                          */
1055 /* IPv6 Only                                                                */
1056 /* Analyse the packet for ESP properties.                                   */
1057 /* The minimum length is taken to be the SPI (32bits) plus a tail (32bits)  */
1058 /* even though the newer ESP packets must also have a sequence number that  */
1059 /* is 32bits as well, it is not possible(?) to determine the version from a */
1060 /* simple packet header.                                                    */
1061 /* ------------------------------------------------------------------------ */
1062 static INLINE void
1063 ipf_pr_esp6(fin)
1064         fr_info_t *fin;
1065 {
1066
1067         if ((fin->fin_off == 0) && (ipf_pr_pullup(fin, 8) == -1)) {
1068                 ipf_main_softc_t *softc = fin->fin_main_soft;
1069
1070                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_esp_pullup);
1071                 return;
1072         }
1073 }
1074
1075
1076 /* ------------------------------------------------------------------------ */
1077 /* Function:    ipf_pr_ah6                                                  */
1078 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
1079 /* Parameters:  fin(I) - pointer to packet information                      */
1080 /*                                                                          */
1081 /* IPv6 Only                                                                */
1082 /* Analyse the packet for AH properties.                                    */
1083 /* The minimum length is taken to be the combination of all fields in the   */
1084 /* header being present and no authentication data (null algorithm used.)   */
1085 /* ------------------------------------------------------------------------ */
1086 static INLINE int
1087 ipf_pr_ah6(fin)
1088         fr_info_t *fin;
1089 {
1090         authhdr_t *ah;
1091
1092         fin->fin_flx |= FI_AH;
1093
1094         ah = (authhdr_t *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_HOPOPTS);
1095         if (ah == NULL) {
1096                 ipf_main_softc_t *softc = fin->fin_main_soft;
1097
1098                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ah_bad);
1099                 return IPPROTO_NONE;
1100         }
1101
1102         ipf_pr_short6(fin, sizeof(*ah));
1103
1104         /*
1105          * No need for another pullup, ipf_pr_ipv6exthdr() will pullup
1106          * enough data to satisfy ah_next (the very first one.)
1107          */
1108         return ah->ah_next;
1109 }
1110
1111
1112 /* ------------------------------------------------------------------------ */
1113 /* Function:    ipf_pr_gre6                                                 */
1114 /* Returns:     void                                                        */
1115 /* Parameters:  fin(I) - pointer to packet information                      */
1116 /*                                                                          */
1117 /* Analyse the packet for GRE properties.                                   */
1118 /* ------------------------------------------------------------------------ */
1119 static INLINE void
1120 ipf_pr_gre6(fin)
1121         fr_info_t *fin;
1122 {
1123         grehdr_t *gre;
1124
1125         if (ipf_pr_pullup(fin, sizeof(grehdr_t)) == -1) {
1126                 ipf_main_softc_t *softc = fin->fin_main_soft;
1127
1128                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_gre_pullup);
1129                 return;
1130         }
1131
1132         gre = fin->fin_dp;
1133         if (GRE_REV(gre->gr_flags) == 1)
1134                 fin->fin_data[0] = gre->gr_call;
1135 }
1136 #endif  /* USE_INET6 */
1137
1138
1139 /* ------------------------------------------------------------------------ */
1140 /* Function:    ipf_pr_pullup                                               */
1141 /* Returns:     int     - 0 == pullup succeeded, -1 == failure              */
1142 /* Parameters:  fin(I)  - pointer to packet information                     */
1143 /*              plen(I) - length (excluding L3 header) to pullup            */
1144 /*                                                                          */
1145 /* Short inline function to cut down on code duplication to perform a call  */
1146 /* to ipf_pullup to ensure there is the required amount of data,            */
1147 /* consecutively in the packet buffer.                                      */
1148 /*                                                                          */
1149 /* This function pulls up 'extra' data at the location of fin_dp.  fin_dp   */
1150 /* points to the first byte after the complete layer 3 header, which will   */
1151 /* include all of the known extension headers for IPv6 or options for IPv4. */
1152 /*                                                                          */
1153 /* Since fr_pullup() expects the total length of bytes to be pulled up, it  */
1154 /* is necessary to add those we can already assume to be pulled up (fin_dp  */
1155 /* - fin_ip) to what is passed through.                                     */
1156 /* ------------------------------------------------------------------------ */
1157 int
1158 ipf_pr_pullup(fin, plen)
1159         fr_info_t *fin;
1160         int plen;
1161 {
1162         ipf_main_softc_t *softc = fin->fin_main_soft;
1163
1164         if (fin->fin_m != NULL) {
1165                 if (fin->fin_dp != NULL)
1166                         plen += (char *)fin->fin_dp -
1167                                 ((char *)fin->fin_ip + fin->fin_hlen);
1168                 plen += fin->fin_hlen;
1169                 if (M_LEN(fin->fin_m) < plen + fin->fin_ipoff) {
1170 #if defined(_KERNEL)
1171                         if (ipf_pullup(fin->fin_m, fin, plen) == NULL) {
1172                                 DT(ipf_pullup_fail);
1173                                 LBUMP(ipf_stats[fin->fin_out].fr_pull[1]);
1174                                 return -1;
1175                         }
1176                         LBUMP(ipf_stats[fin->fin_out].fr_pull[0]);
1177 #else
1178                         LBUMP(ipf_stats[fin->fin_out].fr_pull[1]);
1179                         /*
1180                          * Fake ipf_pullup failing
1181                          */
1182                         fin->fin_reason = FRB_PULLUP;
1183                         *fin->fin_mp = NULL;
1184                         fin->fin_m = NULL;
1185                         fin->fin_ip = NULL;
1186                         return -1;
1187 #endif
1188                 }
1189         }
1190         return 0;
1191 }
1192
1193
1194 /* ------------------------------------------------------------------------ */
1195 /* Function:    ipf_pr_short                                                */
1196 /* Returns:     void                                                        */
1197 /* Parameters:  fin(I)  - pointer to packet information                     */
1198 /*              xmin(I) - minimum header size                               */
1199 /*                                                                          */
1200 /* Check if a packet is "short" as defined by xmin.  The rule we are        */
1201 /* applying here is that the packet must not be fragmented within the layer */
1202 /* 4 header.  That is, it must not be a fragment that has its offset set to */
1203 /* start within the layer 4 header (hdrmin) or if it is at offset 0, the    */
1204 /* entire layer 4 header must be present (min).                             */
1205 /* ------------------------------------------------------------------------ */
1206 static INLINE void
1207 ipf_pr_short(fin, xmin)
1208         fr_info_t *fin;
1209         int xmin;
1210 {
1211
1212         if (fin->fin_off == 0) {
1213                 if (fin->fin_dlen < xmin)
1214                         fin->fin_flx |= FI_SHORT;
1215         } else if (fin->fin_off < xmin) {
1216                 fin->fin_flx |= FI_SHORT;
1217         }
1218 }
1219
1220
1221 /* ------------------------------------------------------------------------ */
1222 /* Function:    ipf_pr_icmp                                                 */
1223 /* Returns:     void                                                        */
1224 /* Parameters:  fin(I) - pointer to packet information                      */
1225 /*                                                                          */
1226 /* IPv4 Only                                                                */
1227 /* Do a sanity check on the packet for ICMP (v4).  In nearly all cases,     */
1228 /* except extrememly bad packets, both type and code will be present.       */
1229 /* The expected minimum size of an ICMP packet is very much dependent on    */
1230 /* the type of it.                                                          */
1231 /*                                                                          */
1232 /* XXX - other ICMP sanity checks?                                          */
1233 /* ------------------------------------------------------------------------ */
1234 static INLINE void
1235 ipf_pr_icmp(fin)
1236         fr_info_t *fin;
1237 {
1238         ipf_main_softc_t *softc = fin->fin_main_soft;
1239         int minicmpsz = sizeof(struct icmp);
1240         icmphdr_t *icmp;
1241         ip_t *oip;
1242
1243         ipf_pr_short(fin, ICMPERR_ICMPHLEN);
1244
1245         if (fin->fin_off != 0) {
1246                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_icmp_frag);
1247                 return;
1248         }
1249
1250         if (ipf_pr_pullup(fin, ICMPERR_ICMPHLEN) == -1) {
1251                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_icmp_pullup);
1252                 return;
1253         }
1254
1255         icmp = fin->fin_dp;
1256
1257         fin->fin_data[0] = *(u_short *)icmp;
1258         fin->fin_data[1] = icmp->icmp_id;
1259
1260         switch (icmp->icmp_type)
1261         {
1262         case ICMP_ECHOREPLY :
1263         case ICMP_ECHO :
1264         /* Router discovery messaes - RFC 1256 */
1265         case ICMP_ROUTERADVERT :
1266         case ICMP_ROUTERSOLICIT :
1267                 fin->fin_flx |= FI_ICMPQUERY;
1268                 minicmpsz = ICMP_MINLEN;
1269                 break;
1270         /*
1271          * type(1) + code(1) + cksum(2) + id(2) seq(2) +
1272          * 3 * timestamp(3 * 4)
1273          */
1274         case ICMP_TSTAMP :
1275         case ICMP_TSTAMPREPLY :
1276                 fin->fin_flx |= FI_ICMPQUERY;
1277                 minicmpsz = 20;
1278                 break;
1279         /*
1280          * type(1) + code(1) + cksum(2) + id(2) seq(2) +
1281          * mask(4)
1282          */
1283         case ICMP_IREQ :
1284         case ICMP_IREQREPLY :
1285         case ICMP_MASKREQ :
1286         case ICMP_MASKREPLY :
1287                 fin->fin_flx |= FI_ICMPQUERY;
1288                 minicmpsz = 12;
1289                 break;
1290         /*
1291          * type(1) + code(1) + cksum(2) + id(2) seq(2) + ip(20+)
1292          */
1293         case ICMP_UNREACH :
1294 #ifdef icmp_nextmtu
1295                 if (icmp->icmp_code == ICMP_UNREACH_NEEDFRAG) {
1296                         if (icmp->icmp_nextmtu < softc->ipf_icmpminfragmtu) {
1297                                 fin->fin_flx |= FI_BAD;
1298                                 DT3(ipf_fi_bad_icmp_nextmtu, fr_info_t *, fin, u_int, icmp->icmp_nextmtu, u_int, softc->ipf_icmpminfragmtu);
1299                         }
1300                 }
1301 #endif
1302                 /* FALLTHROUGH */
1303         case ICMP_SOURCEQUENCH :
1304         case ICMP_REDIRECT :
1305         case ICMP_TIMXCEED :
1306         case ICMP_PARAMPROB :
1307                 fin->fin_flx |= FI_ICMPERR;
1308                 if (ipf_coalesce(fin) != 1) {
1309                         LBUMPD(ipf_stats[fin->fin_out], fr_icmp_coalesce);
1310                         return;
1311                 }
1312
1313                 /*
1314                  * ICMP error packets should not be generated for IP
1315                  * packets that are a fragment that isn't the first
1316                  * fragment.
1317                  */
1318                 oip = (ip_t *)((char *)fin->fin_dp + ICMPERR_ICMPHLEN);
1319                 if ((ntohs(oip->ip_off) & IP_OFFMASK) != 0) {
1320                         fin->fin_flx |= FI_BAD;
1321                         DT2(ipf_fi_bad_icmp_err, fr_info_t, fin, u_int, (ntohs(oip->ip_off) & IP_OFFMASK));
1322                 }
1323
1324                 /*
1325                  * If the destination of this packet doesn't match the
1326                  * source of the original packet then this packet is
1327                  * not correct.
1328                  */
1329                 if (oip->ip_src.s_addr != fin->fin_daddr) {
1330                         fin->fin_flx |= FI_BAD;
1331                         DT1(ipf_fi_bad_src_ne_dst, fr_info_t *, fin);
1332                 }
1333                 break;
1334         default :
1335                 break;
1336         }
1337
1338         ipf_pr_short(fin, minicmpsz);
1339
1340         ipf_checkv4sum(fin);
1341 }
1342
1343
1344 /* ------------------------------------------------------------------------ */
1345 /* Function:    ipf_pr_tcpcommon                                            */
1346 /* Returns:     int    - 0 = header ok, 1 = bad packet, -1 = buffer error   */
1347 /* Parameters:  fin(I) - pointer to packet information                      */
1348 /*                                                                          */
1349 /* TCP header sanity checking.  Look for bad combinations of TCP flags,     */
1350 /* and make some checks with how they interact with other fields.           */
1351 /* If compiled with IPFILTER_CKSUM, check to see if the TCP checksum is     */
1352 /* valid and mark the packet as bad if not.                                 */
1353 /* ------------------------------------------------------------------------ */
1354 static INLINE int
1355 ipf_pr_tcpcommon(fin)
1356         fr_info_t *fin;
1357 {
1358         ipf_main_softc_t *softc = fin->fin_main_soft;
1359         int flags, tlen;
1360         tcphdr_t *tcp;
1361
1362         fin->fin_flx |= FI_TCPUDP;
1363         if (fin->fin_off != 0) {
1364                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_frag);
1365                 return 0;
1366         }
1367
1368         if (ipf_pr_pullup(fin, sizeof(*tcp)) == -1) {
1369                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_pullup);
1370                 return -1;
1371         }
1372
1373         tcp = fin->fin_dp;
1374         if (fin->fin_dlen > 3) {
1375                 fin->fin_sport = ntohs(tcp->th_sport);
1376                 fin->fin_dport = ntohs(tcp->th_dport);
1377         }
1378
1379         if ((fin->fin_flx & FI_SHORT) != 0) {
1380                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_short);
1381                 return 1;
1382         }
1383
1384         /*
1385          * Use of the TCP data offset *must* result in a value that is at
1386          * least the same size as the TCP header.
1387          */
1388         tlen = TCP_OFF(tcp) << 2;
1389         if (tlen < sizeof(tcphdr_t)) {
1390                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_small);
1391                 fin->fin_flx |= FI_BAD;
1392                 DT3(ipf_fi_bad_tlen, fr_info_t, fin, u_int, tlen, u_int, sizeof(tcphdr_t));
1393                 return 1;
1394         }
1395
1396         flags = tcp->th_flags;
1397         fin->fin_tcpf = tcp->th_flags;
1398
1399         /*
1400          * If the urgent flag is set, then the urgent pointer must
1401          * also be set and vice versa.  Good TCP packets do not have
1402          * just one of these set.
1403          */
1404         if ((flags & TH_URG) != 0 && (tcp->th_urp == 0)) {
1405                 fin->fin_flx |= FI_BAD;
1406                 DT3(ipf_fi_bad_th_urg, fr_info_t*, fin, u_int, (flags & TH_URG), u_int, tcp->th_urp);
1407 #if 0
1408         } else if ((flags & TH_URG) == 0 && (tcp->th_urp != 0)) {
1409                 /*
1410                  * Ignore this case (#if 0) as it shows up in "real"
1411                  * traffic with bogus values in the urgent pointer field.
1412                  */
1413                 fin->fin_flx |= FI_BAD;
1414                 DT3(ipf_fi_bad_th_urg0, fr_info_t *, fin, u_int, (flags & TH_URG), u_int, tcp->th_urp);
1415 #endif
1416         } else if (((flags & (TH_SYN|TH_FIN)) != 0) &&
1417                    ((flags & (TH_RST|TH_ACK)) == TH_RST)) {
1418                 /* TH_FIN|TH_RST|TH_ACK seems to appear "naturally" */
1419                 fin->fin_flx |= FI_BAD;
1420                 DT1(ipf_fi_bad_th_fin_rst_ack, fr_info_t, fin);
1421 #if 1
1422         } else if (((flags & TH_SYN) != 0) &&
1423                    ((flags & (TH_URG|TH_PUSH)) != 0)) {
1424                 /*
1425                  * SYN with URG and PUSH set is not for normal TCP but it is
1426                  * possible(?) with T/TCP...but who uses T/TCP?
1427                  */
1428                 fin->fin_flx |= FI_BAD;
1429                 DT1(ipf_fi_bad_th_syn_urg_psh, fr_info_t *, fin);
1430 #endif
1431         } else if (!(flags & TH_ACK)) {
1432                 /*
1433                  * If the ack bit isn't set, then either the SYN or
1434                  * RST bit must be set.  If the SYN bit is set, then
1435                  * we expect the ACK field to be 0.  If the ACK is
1436                  * not set and if URG, PSH or FIN are set, consdier
1437                  * that to indicate a bad TCP packet.
1438                  */
1439                 if ((flags == TH_SYN) && (tcp->th_ack != 0)) {
1440                         /*
1441                          * Cisco PIX sets the ACK field to a random value.
1442                          * In light of this, do not set FI_BAD until a patch
1443                          * is available from Cisco to ensure that
1444                          * interoperability between existing systems is
1445                          * achieved.
1446                          */
1447                         /*fin->fin_flx |= FI_BAD*/;
1448                         /*DT1(ipf_fi_bad_th_syn_ack, fr_info_t *, fin);*/
1449                 } else if (!(flags & (TH_RST|TH_SYN))) {
1450                         fin->fin_flx |= FI_BAD;
1451                         DT1(ipf_fi_bad_th_rst_syn, fr_info_t *, fin);
1452                 } else if ((flags & (TH_URG|TH_PUSH|TH_FIN)) != 0) {
1453                         fin->fin_flx |= FI_BAD;
1454                         DT1(ipf_fi_bad_th_urg_push_fin, fr_info_t *, fin);
1455                 }
1456         }
1457         if (fin->fin_flx & FI_BAD) {
1458                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_bad_flags);
1459                 return 1;
1460         }
1461
1462         /*
1463          * At this point, it's not exactly clear what is to be gained by
1464          * marking up which TCP options are and are not present.  The one we
1465          * are most interested in is the TCP window scale.  This is only in
1466          * a SYN packet [RFC1323] so we don't need this here...?
1467          * Now if we were to analyse the header for passive fingerprinting,
1468          * then that might add some weight to adding this...
1469          */
1470         if (tlen == sizeof(tcphdr_t)) {
1471                 return 0;
1472         }
1473
1474         if (ipf_pr_pullup(fin, tlen) == -1) {
1475                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_pullup);
1476                 return -1;
1477         }
1478
1479 #if 0
1480         tcp = fin->fin_dp;
1481         ip = fin->fin_ip;
1482         s = (u_char *)(tcp + 1);
1483         off = IP_HL(ip) << 2;
1484 # ifdef _KERNEL
1485         if (fin->fin_mp != NULL) {
1486                 mb_t *m = *fin->fin_mp;
1487
1488                 if (off + tlen > M_LEN(m))
1489                         return;
1490         }
1491 # endif
1492         for (tlen -= (int)sizeof(*tcp); tlen > 0; ) {
1493                 opt = *s;
1494                 if (opt == '\0')
1495                         break;
1496                 else if (opt == TCPOPT_NOP)
1497                         ol = 1;
1498                 else {
1499                         if (tlen < 2)
1500                                 break;
1501                         ol = (int)*(s + 1);
1502                         if (ol < 2 || ol > tlen)
1503                                 break;
1504                 }
1505
1506                 for (i = 9, mv = 4; mv >= 0; ) {
1507                         op = ipopts + i;
1508                         if (opt == (u_char)op->ol_val) {
1509                                 optmsk |= op->ol_bit;
1510                                 break;
1511                         }
1512                 }
1513                 tlen -= ol;
1514                 s += ol;
1515         }
1516 #endif /* 0 */
1517
1518         return 0;
1519 }
1520
1521
1522
1523 /* ------------------------------------------------------------------------ */
1524 /* Function:    ipf_pr_udpcommon                                            */
1525 /* Returns:     int    - 0 = header ok, 1 = bad packet                      */
1526 /* Parameters:  fin(I) - pointer to packet information                      */
1527 /*                                                                          */
1528 /* Extract the UDP source and destination ports, if present.  If compiled   */
1529 /* with IPFILTER_CKSUM, check to see if the UDP checksum is valid.          */
1530 /* ------------------------------------------------------------------------ */
1531 static INLINE int
1532 ipf_pr_udpcommon(fin)
1533         fr_info_t *fin;
1534 {
1535         udphdr_t *udp;
1536
1537         fin->fin_flx |= FI_TCPUDP;
1538
1539         if (!fin->fin_off && (fin->fin_dlen > 3)) {
1540                 if (ipf_pr_pullup(fin, sizeof(*udp)) == -1) {
1541                         ipf_main_softc_t *softc = fin->fin_main_soft;
1542
1543                         fin->fin_flx |= FI_SHORT;
1544                         LBUMPD(ipf_stats[fin->fin_out], fr_udp_pullup);
1545                         return 1;
1546                 }
1547
1548                 udp = fin->fin_dp;
1549
1550                 fin->fin_sport = ntohs(udp->uh_sport);
1551                 fin->fin_dport = ntohs(udp->uh_dport);
1552         }
1553
1554         return 0;
1555 }
1556
1557
1558 /* ------------------------------------------------------------------------ */
1559 /* Function:    ipf_pr_tcp                                                  */
1560 /* Returns:     void                                                        */
1561 /* Parameters:  fin(I) - pointer to packet information                      */
1562 /*                                                                          */
1563 /* IPv4 Only                                                                */
1564 /* Analyse the packet for IPv4/TCP properties.                              */
1565 /* ------------------------------------------------------------------------ */
1566 static INLINE void
1567 ipf_pr_tcp(fin)
1568         fr_info_t *fin;
1569 {
1570
1571         ipf_pr_short(fin, sizeof(tcphdr_t));
1572
1573         if (ipf_pr_tcpcommon(fin) == 0)
1574                 ipf_checkv4sum(fin);
1575 }
1576
1577
1578 /* ------------------------------------------------------------------------ */
1579 /* Function:    ipf_pr_udp                                                  */
1580 /* Returns:     void                                                        */
1581 /* Parameters:  fin(I) - pointer to packet information                      */
1582 /*                                                                          */
1583 /* IPv4 Only                                                                */
1584 /* Analyse the packet for IPv4/UDP properties.                              */
1585 /* ------------------------------------------------------------------------ */
1586 static INLINE void
1587 ipf_pr_udp(fin)
1588         fr_info_t *fin;
1589 {
1590
1591         ipf_pr_short(fin, sizeof(udphdr_t));
1592
1593         if (ipf_pr_udpcommon(fin) == 0)
1594                 ipf_checkv4sum(fin);
1595 }
1596
1597
1598 /* ------------------------------------------------------------------------ */
1599 /* Function:    ipf_pr_esp                                                  */
1600 /* Returns:     void                                                        */
1601 /* Parameters:  fin(I) - pointer to packet information                      */
1602 /*                                                                          */
1603 /* Analyse the packet for ESP properties.                                   */
1604 /* The minimum length is taken to be the SPI (32bits) plus a tail (32bits)  */
1605 /* even though the newer ESP packets must also have a sequence number that  */
1606 /* is 32bits as well, it is not possible(?) to determine the version from a */
1607 /* simple packet header.                                                    */
1608 /* ------------------------------------------------------------------------ */
1609 static INLINE void
1610 ipf_pr_esp(fin)
1611         fr_info_t *fin;
1612 {
1613
1614         if (fin->fin_off == 0) {
1615                 ipf_pr_short(fin, 8);
1616                 if (ipf_pr_pullup(fin, 8) == -1) {
1617                         ipf_main_softc_t *softc = fin->fin_main_soft;
1618
1619                         LBUMPD(ipf_stats[fin->fin_out], fr_v4_esp_pullup);
1620                 }
1621         }
1622 }
1623
1624
1625 /* ------------------------------------------------------------------------ */
1626 /* Function:    ipf_pr_ah                                                   */
1627 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
1628 /* Parameters:  fin(I) - pointer to packet information                      */
1629 /*                                                                          */
1630 /* Analyse the packet for AH properties.                                    */
1631 /* The minimum length is taken to be the combination of all fields in the   */
1632 /* header being present and no authentication data (null algorithm used.)   */
1633 /* ------------------------------------------------------------------------ */
1634 static INLINE int
1635 ipf_pr_ah(fin)
1636         fr_info_t *fin;
1637 {
1638         ipf_main_softc_t *softc = fin->fin_main_soft;
1639         authhdr_t *ah;
1640         int len;
1641
1642         fin->fin_flx |= FI_AH;
1643         ipf_pr_short(fin, sizeof(*ah));
1644
1645         if (((fin->fin_flx & FI_SHORT) != 0) || (fin->fin_off != 0)) {
1646                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_ah_bad);
1647                 return IPPROTO_NONE;
1648         }
1649
1650         if (ipf_pr_pullup(fin, sizeof(*ah)) == -1) {
1651                 DT(fr_v4_ah_pullup_1);
1652                 LBUMP(ipf_stats[fin->fin_out].fr_v4_ah_pullup);
1653                 return IPPROTO_NONE;
1654         }
1655
1656         ah = (authhdr_t *)fin->fin_dp;
1657
1658         len = (ah->ah_plen + 2) << 2;
1659         ipf_pr_short(fin, len);
1660         if (ipf_pr_pullup(fin, len) == -1) {
1661                 DT(fr_v4_ah_pullup_2);
1662                 LBUMP(ipf_stats[fin->fin_out].fr_v4_ah_pullup);
1663                 return IPPROTO_NONE;
1664         }
1665
1666         /*
1667          * Adjust fin_dp and fin_dlen for skipping over the authentication
1668          * header.
1669          */
1670         fin->fin_dp = (char *)fin->fin_dp + len;
1671         fin->fin_dlen -= len;
1672         return ah->ah_next;
1673 }
1674
1675
1676 /* ------------------------------------------------------------------------ */
1677 /* Function:    ipf_pr_gre                                                  */
1678 /* Returns:     void                                                        */
1679 /* Parameters:  fin(I) - pointer to packet information                      */
1680 /*                                                                          */
1681 /* Analyse the packet for GRE properties.                                   */
1682 /* ------------------------------------------------------------------------ */
1683 static INLINE void
1684 ipf_pr_gre(fin)
1685         fr_info_t *fin;
1686 {
1687         ipf_main_softc_t *softc = fin->fin_main_soft;
1688         grehdr_t *gre;
1689
1690         ipf_pr_short(fin, sizeof(grehdr_t));
1691
1692         if (fin->fin_off != 0) {
1693                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_gre_frag);
1694                 return;
1695         }
1696
1697         if (ipf_pr_pullup(fin, sizeof(grehdr_t)) == -1) {
1698                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_gre_pullup);
1699                 return;
1700         }
1701
1702         gre = fin->fin_dp;
1703         if (GRE_REV(gre->gr_flags) == 1)
1704                 fin->fin_data[0] = gre->gr_call;
1705 }
1706
1707
1708 /* ------------------------------------------------------------------------ */
1709 /* Function:    ipf_pr_ipv4hdr                                              */
1710 /* Returns:     void                                                        */
1711 /* Parameters:  fin(I) - pointer to packet information                      */
1712 /*                                                                          */
1713 /* IPv4 Only                                                                */
1714 /* Analyze the IPv4 header and set fields in the fr_info_t structure.       */
1715 /* Check all options present and flag their presence if any exist.          */
1716 /* ------------------------------------------------------------------------ */
1717 static INLINE void
1718 ipf_pr_ipv4hdr(fin)
1719         fr_info_t *fin;
1720 {
1721         u_short optmsk = 0, secmsk = 0, auth = 0;
1722         int hlen, ol, mv, p, i;
1723         const struct optlist *op;
1724         u_char *s, opt;
1725         u_short off;
1726         fr_ip_t *fi;
1727         ip_t *ip;
1728
1729         fi = &fin->fin_fi;
1730         hlen = fin->fin_hlen;
1731
1732         ip = fin->fin_ip;
1733         p = ip->ip_p;
1734         fi->fi_p = p;
1735         fin->fin_crc = p;
1736         fi->fi_tos = ip->ip_tos;
1737         fin->fin_id = ip->ip_id;
1738         off = ntohs(ip->ip_off);
1739
1740         /* Get both TTL and protocol */
1741         fi->fi_p = ip->ip_p;
1742         fi->fi_ttl = ip->ip_ttl;
1743
1744         /* Zero out bits not used in IPv6 address */
1745         fi->fi_src.i6[1] = 0;
1746         fi->fi_src.i6[2] = 0;
1747         fi->fi_src.i6[3] = 0;
1748         fi->fi_dst.i6[1] = 0;
1749         fi->fi_dst.i6[2] = 0;
1750         fi->fi_dst.i6[3] = 0;
1751
1752         fi->fi_saddr = ip->ip_src.s_addr;
1753         fin->fin_crc += fi->fi_saddr;
1754         fi->fi_daddr = ip->ip_dst.s_addr;
1755         fin->fin_crc += fi->fi_daddr;
1756         if (IN_CLASSD(ntohl(fi->fi_daddr)))
1757                 fin->fin_flx |= FI_MULTICAST|FI_MBCAST;
1758
1759         /*
1760          * set packet attribute flags based on the offset and
1761          * calculate the byte offset that it represents.
1762          */
1763         off &= IP_MF|IP_OFFMASK;
1764         if (off != 0) {
1765                 int morefrag = off & IP_MF;
1766
1767                 fi->fi_flx |= FI_FRAG;
1768                 off &= IP_OFFMASK;
1769                 if (off != 0) {
1770                         fin->fin_flx |= FI_FRAGBODY;
1771                         off <<= 3;
1772                         if ((off + fin->fin_dlen > 65535) ||
1773                             (fin->fin_dlen == 0) ||
1774                             ((morefrag != 0) && ((fin->fin_dlen & 7) != 0))) {
1775                                 /*
1776                                  * The length of the packet, starting at its
1777                                  * offset cannot exceed 65535 (0xffff) as the
1778                                  * length of an IP packet is only 16 bits.
1779                                  *
1780                                  * Any fragment that isn't the last fragment
1781                                  * must have a length greater than 0 and it
1782                                  * must be an even multiple of 8.
1783                                  */
1784                                 fi->fi_flx |= FI_BAD;
1785                                 DT1(ipf_fi_bad_fragbody_gt_65535, fr_info_t *, fin);
1786                         }
1787                 }
1788         }
1789         fin->fin_off = off;
1790
1791         /*
1792          * Call per-protocol setup and checking
1793          */
1794         if (p == IPPROTO_AH) {
1795                 /*
1796                  * Treat AH differently because we expect there to be another
1797                  * layer 4 header after it.
1798                  */
1799                 p = ipf_pr_ah(fin);
1800         }
1801
1802         switch (p)
1803         {
1804         case IPPROTO_UDP :
1805                 ipf_pr_udp(fin);
1806                 break;
1807         case IPPROTO_TCP :
1808                 ipf_pr_tcp(fin);
1809                 break;
1810         case IPPROTO_ICMP :
1811                 ipf_pr_icmp(fin);
1812                 break;
1813         case IPPROTO_ESP :
1814                 ipf_pr_esp(fin);
1815                 break;
1816         case IPPROTO_GRE :
1817                 ipf_pr_gre(fin);
1818                 break;
1819         }
1820
1821         ip = fin->fin_ip;
1822         if (ip == NULL)
1823                 return;
1824
1825         /*
1826          * If it is a standard IP header (no options), set the flag fields
1827          * which relate to options to 0.
1828          */
1829         if (hlen == sizeof(*ip)) {
1830                 fi->fi_optmsk = 0;
1831                 fi->fi_secmsk = 0;
1832                 fi->fi_auth = 0;
1833                 return;
1834         }
1835
1836         /*
1837          * So the IP header has some IP options attached.  Walk the entire
1838          * list of options present with this packet and set flags to indicate
1839          * which ones are here and which ones are not.  For the somewhat out
1840          * of date and obscure security classification options, set a flag to
1841          * represent which classification is present.
1842          */
1843         fi->fi_flx |= FI_OPTIONS;
1844
1845         for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) {
1846                 opt = *s;
1847                 if (opt == '\0')
1848                         break;
1849                 else if (opt == IPOPT_NOP)
1850                         ol = 1;
1851                 else {
1852                         if (hlen < 2)
1853                                 break;
1854                         ol = (int)*(s + 1);
1855                         if (ol < 2 || ol > hlen)
1856                                 break;
1857                 }
1858                 for (i = 9, mv = 4; mv >= 0; ) {
1859                         op = ipopts + i;
1860
1861                         if ((opt == (u_char)op->ol_val) && (ol > 4)) {
1862                                 u_32_t doi;
1863
1864                                 switch (opt)
1865                                 {
1866                                 case IPOPT_SECURITY :
1867                                         if (optmsk & op->ol_bit) {
1868                                                 fin->fin_flx |= FI_BAD;
1869                                                 DT2(ipf_fi_bad_ipopt_security, fr_info_t *, fin, u_short, (optmsk & op->ol_bit));
1870                                         } else {
1871                                                 doi = ipf_checkripso(s);
1872                                                 secmsk = doi >> 16;
1873                                                 auth = doi & 0xffff;
1874                                         }
1875                                         break;
1876
1877                                 case IPOPT_CIPSO :
1878
1879                                         if (optmsk & op->ol_bit) {
1880                                                 fin->fin_flx |= FI_BAD;
1881                                                 DT2(ipf_fi_bad_ipopt_cipso, fr_info_t *, fin, u_short, (optmsk & op->ol_bit));
1882                                         } else {
1883                                                 doi = ipf_checkcipso(fin,
1884                                                                      s, ol);
1885                                                 secmsk = doi >> 16;
1886                                                 auth = doi & 0xffff;
1887                                         }
1888                                         break;
1889                                 }
1890                                 optmsk |= op->ol_bit;
1891                         }
1892
1893                         if (opt < op->ol_val)
1894                                 i -= mv;
1895                         else
1896                                 i += mv;
1897                         mv--;
1898                 }
1899                 hlen -= ol;
1900                 s += ol;
1901         }
1902
1903         /*
1904          *
1905          */
1906         if (auth && !(auth & 0x0100))
1907                 auth &= 0xff00;
1908         fi->fi_optmsk = optmsk;
1909         fi->fi_secmsk = secmsk;
1910         fi->fi_auth = auth;
1911 }
1912
1913
1914 /* ------------------------------------------------------------------------ */
1915 /* Function:    ipf_checkripso                                              */
1916 /* Returns:     void                                                        */
1917 /* Parameters:  s(I)   - pointer to start of RIPSO option                   */
1918 /*                                                                          */
1919 /* ------------------------------------------------------------------------ */
1920 static u_32_t
1921 ipf_checkripso(s)
1922         u_char *s;
1923 {
1924         const struct optlist *sp;
1925         u_short secmsk = 0, auth = 0;
1926         u_char sec;
1927         int j, m;
1928
1929         sec = *(s + 2); /* classification */
1930         for (j = 3, m = 2; m >= 0; ) {
1931                 sp = secopt + j;
1932                 if (sec == sp->ol_val) {
1933                         secmsk |= sp->ol_bit;
1934                         auth = *(s + 3);
1935                         auth *= 256;
1936                         auth += *(s + 4);
1937                         break;
1938                 }
1939                 if (sec < sp->ol_val)
1940                         j -= m;
1941                 else
1942                         j += m;
1943                 m--;
1944         }
1945
1946         return (secmsk << 16) | auth;
1947 }
1948
1949
1950 /* ------------------------------------------------------------------------ */
1951 /* Function:    ipf_checkcipso                                              */
1952 /* Returns:     u_32_t  - 0 = failure, else the doi from the header         */
1953 /* Parameters:  fin(IO) - pointer to packet information                     */
1954 /*              s(I)    - pointer to start of CIPSO option                  */
1955 /*              ol(I)   - length of CIPSO option field                      */
1956 /*                                                                          */
1957 /* This function returns the domain of integrity (DOI) field from the CIPSO */
1958 /* header and returns that whilst also storing the highest sensitivity      */
1959 /* value found in the fr_info_t structure.                                  */
1960 /*                                                                          */
1961 /* No attempt is made to extract the category bitmaps as these are defined  */
1962 /* by the user (rather than the protocol) and can be rather numerous on the */
1963 /* end nodes.                                                               */
1964 /* ------------------------------------------------------------------------ */
1965 static u_32_t
1966 ipf_checkcipso(fin, s, ol)
1967         fr_info_t *fin;
1968         u_char *s;
1969         int ol;
1970 {
1971         ipf_main_softc_t *softc = fin->fin_main_soft;
1972         fr_ip_t *fi;
1973         u_32_t doi;
1974         u_char *t, tag, tlen, sensitivity;
1975         int len;
1976
1977         if (ol < 6 || ol > 40) {
1978                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_cipso_bad);
1979                 fin->fin_flx |= FI_BAD;
1980                 DT2(ipf_fi_bad_checkcipso_ol, fr_info_t *, fin, u_int, ol);
1981                 return 0;
1982         }
1983
1984         fi = &fin->fin_fi;
1985         fi->fi_sensitivity = 0;
1986         /*
1987          * The DOI field MUST be there.
1988          */
1989         bcopy(s + 2, &doi, sizeof(doi));
1990
1991         t = (u_char *)s + 6;
1992         for (len = ol - 6; len >= 2; len -= tlen, t+= tlen) {
1993                 tag = *t;
1994                 tlen = *(t + 1);
1995                 if (tlen > len || tlen < 4 || tlen > 34) {
1996                         LBUMPD(ipf_stats[fin->fin_out], fr_v4_cipso_tlen);
1997                         fin->fin_flx |= FI_BAD;
1998                         DT2(ipf_fi_bad_checkcipso_tlen, fr_info_t *, fin, u_int, tlen);
1999                         return 0;
2000                 }
2001
2002                 sensitivity = 0;
2003                 /*
2004                  * Tag numbers 0, 1, 2, 5 are laid out in the CIPSO Internet
2005                  * draft (16 July 1992) that has expired.
2006                  */
2007                 if (tag == 0) {
2008                         fin->fin_flx |= FI_BAD;
2009                         DT2(ipf_fi_bad_checkcipso_tag, fr_info_t *, fin, u_int, tag);
2010                         continue;
2011                 } else if (tag == 1) {
2012                         if (*(t + 2) != 0) {
2013                                 fin->fin_flx |= FI_BAD;
2014                                 DT2(ipf_fi_bad_checkcipso_tag1_t2, fr_info_t *, fin, u_int, (*t + 2));
2015                                 continue;
2016                         }
2017                         sensitivity = *(t + 3);
2018                         /* Category bitmap for categories 0-239 */
2019
2020                 } else if (tag == 4) {
2021                         if (*(t + 2) != 0) {
2022                                 fin->fin_flx |= FI_BAD;
2023                                 DT2(ipf_fi_bad_checkcipso_tag4_t2, fr_info_t *, fin, u_int, (*t + 2));
2024                                 continue;
2025                         }
2026                         sensitivity = *(t + 3);
2027                         /* Enumerated categories, 16bits each, upto 15 */
2028
2029                 } else if (tag == 5) {
2030                         if (*(t + 2) != 0) {
2031                                 fin->fin_flx |= FI_BAD;
2032                                 DT2(ipf_fi_bad_checkcipso_tag5_t2, fr_info_t *, fin, u_int, (*t + 2));
2033                                 continue;
2034                         }
2035                         sensitivity = *(t + 3);
2036                         /* Range of categories (2*16bits), up to 7 pairs */
2037
2038                 } else if (tag > 127) {
2039                         /* Custom defined DOI */
2040                         ;
2041                 } else {
2042                         fin->fin_flx |= FI_BAD;
2043                         DT2(ipf_fi_bad_checkcipso_tag127, fr_info_t *, fin, u_int, tag);
2044                         continue;
2045                 }
2046
2047                 if (sensitivity > fi->fi_sensitivity)
2048                         fi->fi_sensitivity = sensitivity;
2049         }
2050
2051         return doi;
2052 }
2053
2054
2055 /* ------------------------------------------------------------------------ */
2056 /* Function:    ipf_makefrip                                                */
2057 /* Returns:     int     - 0 == packet ok, -1 == packet freed                */
2058 /* Parameters:  hlen(I) - length of IP packet header                        */
2059 /*              ip(I)   - pointer to the IP header                          */
2060 /*              fin(IO) - pointer to packet information                     */
2061 /*                                                                          */
2062 /* Compact the IP header into a structure which contains just the info.     */
2063 /* which is useful for comparing IP headers with and store this information */
2064 /* in the fr_info_t structure pointer to by fin.  At present, it is assumed */
2065 /* this function will be called with either an IPv4 or IPv6 packet.         */
2066 /* ------------------------------------------------------------------------ */
2067 int
2068 ipf_makefrip(hlen, ip, fin)
2069         int hlen;
2070         ip_t *ip;
2071         fr_info_t *fin;
2072 {
2073         ipf_main_softc_t *softc = fin->fin_main_soft;
2074         int v;
2075
2076         fin->fin_depth = 0;
2077         fin->fin_hlen = (u_short)hlen;
2078         fin->fin_ip = ip;
2079         fin->fin_rule = 0xffffffff;
2080         fin->fin_group[0] = -1;
2081         fin->fin_group[1] = '\0';
2082         fin->fin_dp = (char *)ip + hlen;
2083
2084         v = fin->fin_v;
2085         if (v == 4) {
2086                 fin->fin_plen = ntohs(ip->ip_len);
2087                 fin->fin_dlen = fin->fin_plen - hlen;
2088                 ipf_pr_ipv4hdr(fin);
2089 #ifdef  USE_INET6
2090         } else if (v == 6) {
2091                 fin->fin_plen = ntohs(((ip6_t *)ip)->ip6_plen);
2092                 fin->fin_dlen = fin->fin_plen;
2093                 fin->fin_plen += hlen;
2094
2095                 ipf_pr_ipv6hdr(fin);
2096 #endif
2097         }
2098         if (fin->fin_ip == NULL) {
2099                 LBUMP(ipf_stats[fin->fin_out].fr_ip_freed);
2100                 return -1;
2101         }
2102         return 0;
2103 }
2104
2105
2106 /* ------------------------------------------------------------------------ */
2107 /* Function:    ipf_portcheck                                               */
2108 /* Returns:     int - 1 == port matched, 0 == port match failed             */
2109 /* Parameters:  frp(I) - pointer to port check `expression'                 */
2110 /*              pop(I) - port number to evaluate                            */
2111 /*                                                                          */
2112 /* Perform a comparison of a port number against some other(s), using a     */
2113 /* structure with compare information stored in it.                         */
2114 /* ------------------------------------------------------------------------ */
2115 static INLINE int
2116 ipf_portcheck(frp, pop)
2117         frpcmp_t *frp;
2118         u_32_t pop;
2119 {
2120         int err = 1;
2121         u_32_t po;
2122
2123         po = frp->frp_port;
2124
2125         /*
2126          * Do opposite test to that required and continue if that succeeds.
2127          */
2128         switch (frp->frp_cmp)
2129         {
2130         case FR_EQUAL :
2131                 if (pop != po) /* EQUAL */
2132                         err = 0;
2133                 break;
2134         case FR_NEQUAL :
2135                 if (pop == po) /* NOTEQUAL */
2136                         err = 0;
2137                 break;
2138         case FR_LESST :
2139                 if (pop >= po) /* LESSTHAN */
2140                         err = 0;
2141                 break;
2142         case FR_GREATERT :
2143                 if (pop <= po) /* GREATERTHAN */
2144                         err = 0;
2145                 break;
2146         case FR_LESSTE :
2147                 if (pop > po) /* LT or EQ */
2148                         err = 0;
2149                 break;
2150         case FR_GREATERTE :
2151                 if (pop < po) /* GT or EQ */
2152                         err = 0;
2153                 break;
2154         case FR_OUTRANGE :
2155                 if (pop >= po && pop <= frp->frp_top) /* Out of range */
2156                         err = 0;
2157                 break;
2158         case FR_INRANGE :
2159                 if (pop <= po || pop >= frp->frp_top) /* In range */
2160                         err = 0;
2161                 break;
2162         case FR_INCRANGE :
2163                 if (pop < po || pop > frp->frp_top) /* Inclusive range */
2164                         err = 0;
2165                 break;
2166         default :
2167                 break;
2168         }
2169         return err;
2170 }
2171
2172
2173 /* ------------------------------------------------------------------------ */
2174 /* Function:    ipf_tcpudpchk                                               */
2175 /* Returns:     int - 1 == protocol matched, 0 == check failed              */
2176 /* Parameters:  fda(I) - pointer to packet information                      */
2177 /*              ft(I)  - pointer to structure with comparison data          */
2178 /*                                                                          */
2179 /* Compares the current pcket (assuming it is TCP/UDP) information with a   */
2180 /* structure containing information that we want to match against.          */
2181 /* ------------------------------------------------------------------------ */
2182 int
2183 ipf_tcpudpchk(fi, ft)
2184         fr_ip_t *fi;
2185         frtuc_t *ft;
2186 {
2187         int err = 1;
2188
2189         /*
2190          * Both ports should *always* be in the first fragment.
2191          * So far, I cannot find any cases where they can not be.
2192          *
2193          * compare destination ports
2194          */
2195         if (ft->ftu_dcmp)
2196                 err = ipf_portcheck(&ft->ftu_dst, fi->fi_ports[1]);
2197
2198         /*
2199          * compare source ports
2200          */
2201         if (err && ft->ftu_scmp)
2202                 err = ipf_portcheck(&ft->ftu_src, fi->fi_ports[0]);
2203
2204         /*
2205          * If we don't have all the TCP/UDP header, then how can we
2206          * expect to do any sort of match on it ?  If we were looking for
2207          * TCP flags, then NO match.  If not, then match (which should
2208          * satisfy the "short" class too).
2209          */
2210         if (err && (fi->fi_p == IPPROTO_TCP)) {
2211                 if (fi->fi_flx & FI_SHORT)
2212                         return !(ft->ftu_tcpf | ft->ftu_tcpfm);
2213                 /*
2214                  * Match the flags ?  If not, abort this match.
2215                  */
2216                 if (ft->ftu_tcpfm &&
2217                     ft->ftu_tcpf != (fi->fi_tcpf & ft->ftu_tcpfm)) {
2218                         FR_DEBUG(("f. %#x & %#x != %#x\n", fi->fi_tcpf,
2219                                  ft->ftu_tcpfm, ft->ftu_tcpf));
2220                         err = 0;
2221                 }
2222         }
2223         return err;
2224 }
2225
2226
2227 /* ------------------------------------------------------------------------ */
2228 /* Function:    ipf_check_ipf                                               */
2229 /* Returns:     int - 0 == match, else no match                             */
2230 /* Parameters:  fin(I)     - pointer to packet information                  */
2231 /*              fr(I)      - pointer to filter rule                         */
2232 /*              portcmp(I) - flag indicating whether to attempt matching on */
2233 /*                           TCP/UDP port data.                             */
2234 /*                                                                          */
2235 /* Check to see if a packet matches an IPFilter rule.  Checks of addresses, */
2236 /* port numbers, etc, for "standard" IPFilter rules are all orchestrated in */
2237 /* this function.                                                           */
2238 /* ------------------------------------------------------------------------ */
2239 static INLINE int
2240 ipf_check_ipf(fin, fr, portcmp)
2241         fr_info_t *fin;
2242         frentry_t *fr;
2243         int portcmp;
2244 {
2245         u_32_t  *ld, *lm, *lip;
2246         fripf_t *fri;
2247         fr_ip_t *fi;
2248         int i;
2249
2250         fi = &fin->fin_fi;
2251         fri = fr->fr_ipf;
2252         lip = (u_32_t *)fi;
2253         lm = (u_32_t *)&fri->fri_mip;
2254         ld = (u_32_t *)&fri->fri_ip;
2255
2256         /*
2257          * first 32 bits to check coversion:
2258          * IP version, TOS, TTL, protocol
2259          */
2260         i = ((*lip & *lm) != *ld);
2261         FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
2262                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2263         if (i)
2264                 return 1;
2265
2266         /*
2267          * Next 32 bits is a constructed bitmask indicating which IP options
2268          * are present (if any) in this packet.
2269          */
2270         lip++, lm++, ld++;
2271         i = ((*lip & *lm) != *ld);
2272         FR_DEBUG(("1. %#08x & %#08x != %#08x\n",
2273                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2274         if (i != 0)
2275                 return 1;
2276
2277         lip++, lm++, ld++;
2278         /*
2279          * Unrolled loops (4 each, for 32 bits) for address checks.
2280          */
2281         /*
2282          * Check the source address.
2283          */
2284         if (fr->fr_satype == FRI_LOOKUP) {
2285                 i = (*fr->fr_srcfunc)(fin->fin_main_soft, fr->fr_srcptr,
2286                                       fi->fi_v, lip, fin->fin_plen);
2287                 if (i == -1)
2288                         return 1;
2289                 lip += 3;
2290                 lm += 3;
2291                 ld += 3;
2292         } else {
2293                 i = ((*lip & *lm) != *ld);
2294                 FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
2295                            ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2296                 if (fi->fi_v == 6) {
2297                         lip++, lm++, ld++;
2298                         i |= ((*lip & *lm) != *ld);
2299                         FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
2300                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2301                         lip++, lm++, ld++;
2302                         i |= ((*lip & *lm) != *ld);
2303                         FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
2304                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2305                         lip++, lm++, ld++;
2306                         i |= ((*lip & *lm) != *ld);
2307                         FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
2308                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2309                 } else {
2310                         lip += 3;
2311                         lm += 3;
2312                         ld += 3;
2313                 }
2314         }
2315         i ^= (fr->fr_flags & FR_NOTSRCIP) >> 6;
2316         if (i != 0)
2317                 return 1;
2318
2319         /*
2320          * Check the destination address.
2321          */
2322         lip++, lm++, ld++;
2323         if (fr->fr_datype == FRI_LOOKUP) {
2324                 i = (*fr->fr_dstfunc)(fin->fin_main_soft, fr->fr_dstptr,
2325                                       fi->fi_v, lip, fin->fin_plen);
2326                 if (i == -1)
2327                         return 1;
2328                 lip += 3;
2329                 lm += 3;
2330                 ld += 3;
2331         } else {
2332                 i = ((*lip & *lm) != *ld);
2333                 FR_DEBUG(("3a. %#08x & %#08x != %#08x\n",
2334                            ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2335                 if (fi->fi_v == 6) {
2336                         lip++, lm++, ld++;
2337                         i |= ((*lip & *lm) != *ld);
2338                         FR_DEBUG(("3b. %#08x & %#08x != %#08x\n",
2339                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2340                         lip++, lm++, ld++;
2341                         i |= ((*lip & *lm) != *ld);
2342                         FR_DEBUG(("3c. %#08x & %#08x != %#08x\n",
2343                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2344                         lip++, lm++, ld++;
2345                         i |= ((*lip & *lm) != *ld);
2346                         FR_DEBUG(("3d. %#08x & %#08x != %#08x\n",
2347                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2348                 } else {
2349                         lip += 3;
2350                         lm += 3;
2351                         ld += 3;
2352                 }
2353         }
2354         i ^= (fr->fr_flags & FR_NOTDSTIP) >> 7;
2355         if (i != 0)
2356                 return 1;
2357         /*
2358          * IP addresses matched.  The next 32bits contains:
2359          * mast of old IP header security & authentication bits.
2360          */
2361         lip++, lm++, ld++;
2362         i = (*ld - (*lip & *lm));
2363         FR_DEBUG(("4. %#08x & %#08x != %#08x\n", *lip, *lm, *ld));
2364
2365         /*
2366          * Next we have 32 bits of packet flags.
2367          */
2368         lip++, lm++, ld++;
2369         i |= (*ld - (*lip & *lm));
2370         FR_DEBUG(("5. %#08x & %#08x != %#08x\n", *lip, *lm, *ld));
2371
2372         if (i == 0) {
2373                 /*
2374                  * If a fragment, then only the first has what we're
2375                  * looking for here...
2376                  */
2377                 if (portcmp) {
2378                         if (!ipf_tcpudpchk(&fin->fin_fi, &fr->fr_tuc))
2379                                 i = 1;
2380                 } else {
2381                         if (fr->fr_dcmp || fr->fr_scmp ||
2382                             fr->fr_tcpf || fr->fr_tcpfm)
2383                                 i = 1;
2384                         if (fr->fr_icmpm || fr->fr_icmp) {
2385                                 if (((fi->fi_p != IPPROTO_ICMP) &&
2386                                      (fi->fi_p != IPPROTO_ICMPV6)) ||
2387                                     fin->fin_off || (fin->fin_dlen < 2))
2388                                         i = 1;
2389                                 else if ((fin->fin_data[0] & fr->fr_icmpm) !=
2390                                          fr->fr_icmp) {
2391                                         FR_DEBUG(("i. %#x & %#x != %#x\n",
2392                                                  fin->fin_data[0],
2393                                                  fr->fr_icmpm, fr->fr_icmp));
2394                                         i = 1;
2395                                 }
2396                         }
2397                 }
2398         }
2399         return i;
2400 }
2401
2402
2403 /* ------------------------------------------------------------------------ */
2404 /* Function:    ipf_scanlist                                                */
2405 /* Returns:     int - result flags of scanning filter list                  */
2406 /* Parameters:  fin(I) - pointer to packet information                      */
2407 /*              pass(I) - default result to return for filtering            */
2408 /*                                                                          */
2409 /* Check the input/output list of rules for a match to the current packet.  */
2410 /* If a match is found, the value of fr_flags from the rule becomes the     */
2411 /* return value and fin->fin_fr points to the matched rule.                 */
2412 /*                                                                          */
2413 /* This function may be called recusively upto 16 times (limit inbuilt.)    */
2414 /* When unwinding, it should finish up with fin_depth as 0.                 */
2415 /*                                                                          */
2416 /* Could be per interface, but this gets real nasty when you don't have,    */
2417 /* or can't easily change, the kernel source code to .                      */
2418 /* ------------------------------------------------------------------------ */
2419 int
2420 ipf_scanlist(fin, pass)
2421         fr_info_t *fin;
2422         u_32_t pass;
2423 {
2424         ipf_main_softc_t *softc = fin->fin_main_soft;
2425         int rulen, portcmp, off, skip;
2426         struct frentry *fr, *fnext;
2427         u_32_t passt, passo;
2428
2429         /*
2430          * Do not allow nesting deeper than 16 levels.
2431          */
2432         if (fin->fin_depth >= 16)
2433                 return pass;
2434
2435         fr = fin->fin_fr;
2436
2437         /*
2438          * If there are no rules in this list, return now.
2439          */
2440         if (fr == NULL)
2441                 return pass;
2442
2443         skip = 0;
2444         portcmp = 0;
2445         fin->fin_depth++;
2446         fin->fin_fr = NULL;
2447         off = fin->fin_off;
2448
2449         if ((fin->fin_flx & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
2450                 portcmp = 1;
2451
2452         for (rulen = 0; fr; fr = fnext, rulen++) {
2453                 fnext = fr->fr_next;
2454                 if (skip != 0) {
2455                         FR_VERBOSE(("SKIP %d (%#x)\n", skip, fr->fr_flags));
2456                         skip--;
2457                         continue;
2458                 }
2459
2460                 /*
2461                  * In all checks below, a null (zero) value in the
2462                  * filter struture is taken to mean a wildcard.
2463                  *
2464                  * check that we are working for the right interface
2465                  */
2466 #ifdef  _KERNEL
2467                 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
2468                         continue;
2469 #else
2470                 if (opts & (OPT_VERBOSE|OPT_DEBUG))
2471                         printf("\n");
2472                 FR_VERBOSE(("%c", FR_ISSKIP(pass) ? 's' :
2473                                   FR_ISPASS(pass) ? 'p' :
2474                                   FR_ISACCOUNT(pass) ? 'A' :
2475                                   FR_ISAUTH(pass) ? 'a' :
2476                                   (pass & FR_NOMATCH) ? 'n' :'b'));
2477                 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
2478                         continue;
2479                 FR_VERBOSE((":i"));
2480 #endif
2481
2482                 switch (fr->fr_type)
2483                 {
2484                 case FR_T_IPF :
2485                 case FR_T_IPF_BUILTIN :
2486                         if (ipf_check_ipf(fin, fr, portcmp))
2487                                 continue;
2488                         break;
2489 #if defined(IPFILTER_BPF)
2490                 case FR_T_BPFOPC :
2491                 case FR_T_BPFOPC_BUILTIN :
2492                     {
2493                         u_char *mc;
2494                         int wlen;
2495
2496                         if (*fin->fin_mp == NULL)
2497                                 continue;
2498                         if (fin->fin_family != fr->fr_family)
2499                                 continue;
2500                         mc = (u_char *)fin->fin_m;
2501                         wlen = fin->fin_dlen + fin->fin_hlen;
2502                         if (!bpf_filter(fr->fr_data, mc, wlen, 0))
2503                                 continue;
2504                         break;
2505                     }
2506 #endif
2507                 case FR_T_CALLFUNC_BUILTIN :
2508                     {
2509                         frentry_t *f;
2510
2511                         f = (*fr->fr_func)(fin, &pass);
2512                         if (f != NULL)
2513                                 fr = f;
2514                         else
2515                                 continue;
2516                         break;
2517                     }
2518
2519                 case FR_T_IPFEXPR :
2520                 case FR_T_IPFEXPR_BUILTIN :
2521                         if (fin->fin_family != fr->fr_family)
2522                                 continue;
2523                         if (ipf_fr_matcharray(fin, fr->fr_data) == 0)
2524                                 continue;
2525                         break;
2526
2527                 default :
2528                         break;
2529                 }
2530
2531                 if ((fin->fin_out == 0) && (fr->fr_nattag.ipt_num[0] != 0)) {
2532                         if (fin->fin_nattag == NULL)
2533                                 continue;
2534                         if (ipf_matchtag(&fr->fr_nattag, fin->fin_nattag) == 0)
2535                                 continue;
2536                 }
2537                 FR_VERBOSE(("=%d/%d.%d *", fr->fr_grhead, fr->fr_group, rulen));
2538
2539                 passt = fr->fr_flags;
2540
2541                 /*
2542                  * If the rule is a "call now" rule, then call the function
2543                  * in the rule, if it exists and use the results from that.
2544                  * If the function pointer is bad, just make like we ignore
2545                  * it, except for increasing the hit counter.
2546                  */
2547                 if ((passt & FR_CALLNOW) != 0) {
2548                         frentry_t *frs;
2549
2550                         ATOMIC_INC64(fr->fr_hits);
2551                         if ((fr->fr_func == NULL) ||
2552                             (fr->fr_func == (ipfunc_t)-1))
2553                                 continue;
2554
2555                         frs = fin->fin_fr;
2556                         fin->fin_fr = fr;
2557                         fr = (*fr->fr_func)(fin, &passt);
2558                         if (fr == NULL) {
2559                                 fin->fin_fr = frs;
2560                                 continue;
2561                         }
2562                         passt = fr->fr_flags;
2563                 }
2564                 fin->fin_fr = fr;
2565
2566 #ifdef  IPFILTER_LOG
2567                 /*
2568                  * Just log this packet...
2569                  */
2570                 if ((passt & FR_LOGMASK) == FR_LOG) {
2571                         if (ipf_log_pkt(fin, passt) == -1) {
2572                                 if (passt & FR_LOGORBLOCK) {
2573                                         DT(frb_logfail);
2574                                         passt &= ~FR_CMDMASK;
2575                                         passt |= FR_BLOCK|FR_QUICK;
2576                                         fin->fin_reason = FRB_LOGFAIL;
2577                                 }
2578                         }
2579                 }
2580 #endif /* IPFILTER_LOG */
2581
2582                 MUTEX_ENTER(&fr->fr_lock);
2583                 fr->fr_bytes += (U_QUAD_T)fin->fin_plen;
2584                 fr->fr_hits++;
2585                 MUTEX_EXIT(&fr->fr_lock);
2586                 fin->fin_rule = rulen;
2587
2588                 passo = pass;
2589                 if (FR_ISSKIP(passt)) {
2590                         skip = fr->fr_arg;
2591                         continue;
2592                 } else if (((passt & FR_LOGMASK) != FR_LOG) &&
2593                            ((passt & FR_LOGMASK) != FR_DECAPSULATE)) {
2594                         pass = passt;
2595                 }
2596
2597                 if (passt & (FR_RETICMP|FR_FAKEICMP))
2598                         fin->fin_icode = fr->fr_icode;
2599
2600                 if (fr->fr_group != -1) {
2601                         (void) strncpy(fin->fin_group,
2602                                        FR_NAME(fr, fr_group),
2603                                        strlen(FR_NAME(fr, fr_group)));
2604                 } else {
2605                         fin->fin_group[0] = '\0';
2606                 }
2607
2608                 FR_DEBUG(("pass %#x/%#x/%x\n", passo, pass, passt));
2609
2610                 if (fr->fr_grphead != NULL) {
2611                         fin->fin_fr = fr->fr_grphead->fg_start;
2612                         FR_VERBOSE(("group %s\n", FR_NAME(fr, fr_grhead)));
2613
2614                         if (FR_ISDECAPS(passt))
2615                                 passt = ipf_decaps(fin, pass, fr->fr_icode);
2616                         else
2617                                 passt = ipf_scanlist(fin, pass);
2618
2619                         if (fin->fin_fr == NULL) {
2620                                 fin->fin_rule = rulen;
2621                                 if (fr->fr_group != -1)
2622                                         (void) strncpy(fin->fin_group,
2623                                                        fr->fr_names +
2624                                                        fr->fr_group,
2625                                                        strlen(fr->fr_names +
2626                                                               fr->fr_group));
2627                                 fin->fin_fr = fr;
2628                                 passt = pass;
2629                         }
2630                         pass = passt;
2631                 }
2632
2633                 if (pass & FR_QUICK) {
2634                         /*
2635                          * Finally, if we've asked to track state for this
2636                          * packet, set it up.  Add state for "quick" rules
2637                          * here so that if the action fails we can consider
2638                          * the rule to "not match" and keep on processing
2639                          * filter rules.
2640                          */
2641                         if ((pass & FR_KEEPSTATE) && !FR_ISAUTH(pass) &&
2642                             !(fin->fin_flx & FI_STATE)) {
2643                                 int out = fin->fin_out;
2644
2645                                 fin->fin_fr = fr;
2646                                 if (ipf_state_add(softc, fin, NULL, 0) == 0) {
2647                                         LBUMPD(ipf_stats[out], fr_ads);
2648                                 } else {
2649                                         LBUMPD(ipf_stats[out], fr_bads);
2650                                         pass = passo;
2651                                         continue;
2652                                 }
2653                         }
2654                         break;
2655                 }
2656         }
2657         fin->fin_depth--;
2658         return pass;
2659 }
2660
2661
2662 /* ------------------------------------------------------------------------ */
2663 /* Function:    ipf_acctpkt                                                 */
2664 /* Returns:     frentry_t* - always returns NULL                            */
2665 /* Parameters:  fin(I) - pointer to packet information                      */
2666 /*              passp(IO) - pointer to current/new filter decision (unused) */
2667 /*                                                                          */
2668 /* Checks a packet against accounting rules, if there are any for the given */
2669 /* IP protocol version.                                                     */
2670 /*                                                                          */
2671 /* N.B.: this function returns NULL to match the prototype used by other    */
2672 /* functions called from the IPFilter "mainline" in ipf_check().            */
2673 /* ------------------------------------------------------------------------ */
2674 frentry_t *
2675 ipf_acctpkt(fin, passp)
2676         fr_info_t *fin;
2677         u_32_t *passp;
2678 {
2679         ipf_main_softc_t *softc = fin->fin_main_soft;
2680         char group[FR_GROUPLEN];
2681         frentry_t *fr, *frsave;
2682         u_32_t pass, rulen;
2683
2684         passp = passp;
2685         fr = softc->ipf_acct[fin->fin_out][softc->ipf_active];
2686
2687         if (fr != NULL) {
2688                 frsave = fin->fin_fr;
2689                 bcopy(fin->fin_group, group, FR_GROUPLEN);
2690                 rulen = fin->fin_rule;
2691                 fin->fin_fr = fr;
2692                 pass = ipf_scanlist(fin, FR_NOMATCH);
2693                 if (FR_ISACCOUNT(pass)) {
2694                         LBUMPD(ipf_stats[0], fr_acct);
2695                 }
2696                 fin->fin_fr = frsave;
2697                 bcopy(group, fin->fin_group, FR_GROUPLEN);
2698                 fin->fin_rule = rulen;
2699         }
2700         return NULL;
2701 }
2702
2703
2704 /* ------------------------------------------------------------------------ */
2705 /* Function:    ipf_firewall                                                */
2706 /* Returns:     frentry_t* - returns pointer to matched rule, if no matches */
2707 /*                           were found, returns NULL.                      */
2708 /* Parameters:  fin(I) - pointer to packet information                      */
2709 /*              passp(IO) - pointer to current/new filter decision (unused) */
2710 /*                                                                          */
2711 /* Applies an appropriate set of firewall rules to the packet, to see if    */
2712 /* there are any matches.  The first check is to see if a match can be seen */
2713 /* in the cache.  If not, then search an appropriate list of rules.  Once a */
2714 /* matching rule is found, take any appropriate actions as defined by the   */
2715 /* rule - except logging.                                                   */
2716 /* ------------------------------------------------------------------------ */
2717 static frentry_t *
2718 ipf_firewall(fin, passp)
2719         fr_info_t *fin;
2720         u_32_t *passp;
2721 {
2722         ipf_main_softc_t *softc = fin->fin_main_soft;
2723         frentry_t *fr;
2724         u_32_t pass;
2725         int out;
2726
2727         out = fin->fin_out;
2728         pass = *passp;
2729
2730         /*
2731          * This rule cache will only affect packets that are not being
2732          * statefully filtered.
2733          */
2734         fin->fin_fr = softc->ipf_rules[out][softc->ipf_active];
2735         if (fin->fin_fr != NULL)
2736                 pass = ipf_scanlist(fin, softc->ipf_pass);
2737
2738         if ((pass & FR_NOMATCH)) {
2739                 LBUMPD(ipf_stats[out], fr_nom);
2740         }
2741         fr = fin->fin_fr;
2742
2743         /*
2744          * Apply packets per second rate-limiting to a rule as required.
2745          */
2746         if ((fr != NULL) && (fr->fr_pps != 0) &&
2747             !ppsratecheck(&fr->fr_lastpkt, &fr->fr_curpps, fr->fr_pps)) {
2748                 DT2(frb_ppsrate, fr_info_t *, fin, frentry_t *, fr);
2749                 pass &= ~(FR_CMDMASK|FR_RETICMP|FR_RETRST);
2750                 pass |= FR_BLOCK;
2751                 LBUMPD(ipf_stats[out], fr_ppshit);
2752                 fin->fin_reason = FRB_PPSRATE;
2753         }
2754
2755         /*
2756          * If we fail to add a packet to the authorization queue, then we
2757          * drop the packet later.  However, if it was added then pretend
2758          * we've dropped it already.
2759          */
2760         if (FR_ISAUTH(pass)) {
2761                 if (ipf_auth_new(fin->fin_m, fin) != 0) {
2762                         DT1(frb_authnew, fr_info_t *, fin);
2763                         fin->fin_m = *fin->fin_mp = NULL;
2764                         fin->fin_reason = FRB_AUTHNEW;
2765                         fin->fin_error = 0;
2766                 } else {
2767                         IPFERROR(1);
2768                         fin->fin_error = ENOSPC;
2769                 }
2770         }
2771
2772         if ((fr != NULL) && (fr->fr_func != NULL) &&
2773             (fr->fr_func != (ipfunc_t)-1) && !(pass & FR_CALLNOW))
2774                 (void) (*fr->fr_func)(fin, &pass);
2775
2776         /*
2777          * If a rule is a pre-auth rule, check again in the list of rules
2778          * loaded for authenticated use.  It does not particulary matter
2779          * if this search fails because a "preauth" result, from a rule,
2780          * is treated as "not a pass", hence the packet is blocked.
2781          */
2782         if (FR_ISPREAUTH(pass)) {
2783                 pass = ipf_auth_pre_scanlist(softc, fin, pass);
2784         }
2785
2786         /*
2787          * If the rule has "keep frag" and the packet is actually a fragment,
2788          * then create a fragment state entry.
2789          */
2790         if (pass & FR_KEEPFRAG) {
2791                 if (fin->fin_flx & FI_FRAG) {
2792                         if (ipf_frag_new(softc, fin, pass) == -1) {
2793                                 LBUMP(ipf_stats[out].fr_bnfr);
2794                         } else {
2795                                 LBUMP(ipf_stats[out].fr_nfr);
2796                         }
2797                 } else {
2798                         LBUMP(ipf_stats[out].fr_cfr);
2799                 }
2800         }
2801
2802         fr = fin->fin_fr;
2803         *passp = pass;
2804
2805         return fr;
2806 }
2807
2808
2809 /* ------------------------------------------------------------------------ */
2810 /* Function:    ipf_check                                                   */
2811 /* Returns:     int -  0 == packet allowed through,                         */
2812 /*              User space:                                                 */
2813 /*                    -1 == packet blocked                                  */
2814 /*                     1 == packet not matched                              */
2815 /*                    -2 == requires authentication                         */
2816 /*              Kernel:                                                     */
2817 /*                   > 0 == filter error # for packet                       */
2818 /* Parameters: ip(I)   - pointer to start of IPv4/6 packet                  */
2819 /*             hlen(I) - length of header                                   */
2820 /*             ifp(I)  - pointer to interface this packet is on             */
2821 /*             out(I)  - 0 == packet going in, 1 == packet going out        */
2822 /*             mp(IO)  - pointer to caller's buffer pointer that holds this */
2823 /*                       IP packet.                                         */
2824 /* Solaris & HP-UX ONLY :                                                   */
2825 /*             qpi(I)  - pointer to STREAMS queue information for this      */
2826 /*                       interface & direction.                             */
2827 /*                                                                          */
2828 /* ipf_check() is the master function for all IPFilter packet processing.   */
2829 /* It orchestrates: Network Address Translation (NAT), checking for packet  */
2830 /* authorisation (or pre-authorisation), presence of related state info.,   */
2831 /* generating log entries, IP packet accounting, routing of packets as      */
2832 /* directed by firewall rules and of course whether or not to allow the     */
2833 /* packet to be further processed by the kernel.                            */
2834 /*                                                                          */
2835 /* For packets blocked, the contents of "mp" will be NULL'd and the buffer  */
2836 /* freed.  Packets passed may be returned with the pointer pointed to by    */
2837 /* by "mp" changed to a new buffer.                                         */
2838 /* ------------------------------------------------------------------------ */
2839 int
2840 ipf_check(ctx, ip, hlen, ifp, out
2841 #if defined(_KERNEL) && defined(MENTAT)
2842         , qif, mp)
2843         void *qif;
2844 #else
2845         , mp)
2846 #endif
2847         mb_t **mp;
2848         ip_t *ip;
2849         int hlen;
2850         void *ifp;
2851         int out;
2852         void *ctx;
2853 {
2854         /*
2855          * The above really sucks, but short of writing a diff
2856          */
2857         ipf_main_softc_t *softc = ctx;
2858         fr_info_t frinfo;
2859         fr_info_t *fin = &frinfo;
2860         u_32_t pass = softc->ipf_pass;
2861         frentry_t *fr = NULL;
2862         int v = IP_V(ip);
2863         mb_t *mc = NULL;
2864         mb_t *m;
2865         /*
2866          * The first part of ipf_check() deals with making sure that what goes
2867          * into the filtering engine makes some sense.  Information about the
2868          * the packet is distilled, collected into a fr_info_t structure and
2869          * the an attempt to ensure the buffer the packet is in is big enough
2870          * to hold all the required packet headers.
2871          */
2872 #ifdef  _KERNEL
2873 # ifdef MENTAT
2874         qpktinfo_t *qpi = qif;
2875
2876 #  ifdef __sparc
2877         if ((u_int)ip & 0x3)
2878                 return 2;
2879 #  endif
2880 # else
2881         SPL_INT(s);
2882 # endif
2883
2884         if (softc->ipf_running <= 0) {
2885                 return 0;
2886         }
2887
2888         bzero((char *)fin, sizeof(*fin));
2889
2890 # ifdef MENTAT
2891         if (qpi->qpi_flags & QF_BROADCAST)
2892                 fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
2893         if (qpi->qpi_flags & QF_MULTICAST)
2894                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2895         m = qpi->qpi_m;
2896         fin->fin_qfm = m;
2897         fin->fin_qpi = qpi;
2898 # else /* MENTAT */
2899
2900         m = *mp;
2901
2902 #  if defined(M_MCAST)
2903         if ((m->m_flags & M_MCAST) != 0)
2904                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2905 #  endif
2906 #  if defined(M_MLOOP)
2907         if ((m->m_flags & M_MLOOP) != 0)
2908                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2909 #  endif
2910 #  if defined(M_BCAST)
2911         if ((m->m_flags & M_BCAST) != 0)
2912                 fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
2913 #  endif
2914 #  ifdef M_CANFASTFWD
2915         /*
2916          * XXX For now, IP Filter and fast-forwarding of cached flows
2917          * XXX are mutually exclusive.  Eventually, IP Filter should
2918          * XXX get a "can-fast-forward" filter rule.
2919          */
2920         m->m_flags &= ~M_CANFASTFWD;
2921 #  endif /* M_CANFASTFWD */
2922 #  if defined(CSUM_DELAY_DATA) && (!defined(__FreeBSD_version) || \
2923                                    (__FreeBSD_version < 501108))
2924         /*
2925          * disable delayed checksums.
2926          */
2927         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
2928                 in_delayed_cksum(m);
2929                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
2930         }
2931 #  endif /* CSUM_DELAY_DATA */
2932 # endif /* MENTAT */
2933 #else
2934         bzero((char *)fin, sizeof(*fin));
2935         m = *mp;
2936 # if defined(M_MCAST)
2937         if ((m->m_flags & M_MCAST) != 0)
2938                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2939 # endif
2940 # if defined(M_MLOOP)
2941         if ((m->m_flags & M_MLOOP) != 0)
2942                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2943 # endif
2944 # if defined(M_BCAST)
2945         if ((m->m_flags & M_BCAST) != 0)
2946                 fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
2947 # endif
2948 #endif /* _KERNEL */
2949
2950         fin->fin_v = v;
2951         fin->fin_m = m;
2952         fin->fin_ip = ip;
2953         fin->fin_mp = mp;
2954         fin->fin_out = out;
2955         fin->fin_ifp = ifp;
2956         fin->fin_error = ENETUNREACH;
2957         fin->fin_hlen = (u_short)hlen;
2958         fin->fin_dp = (char *)ip + hlen;
2959         fin->fin_main_soft = softc;
2960
2961         fin->fin_ipoff = (char *)ip - MTOD(m, char *);
2962
2963         SPL_NET(s);
2964
2965 #ifdef  USE_INET6
2966         if (v == 6) {
2967                 LBUMP(ipf_stats[out].fr_ipv6);
2968                 /*
2969                  * Jumbo grams are quite likely too big for internal buffer
2970                  * structures to handle comfortably, for now, so just drop
2971                  * them.
2972                  */
2973                 if (((ip6_t *)ip)->ip6_plen == 0) {
2974                         DT1(frb_jumbo, ip6_t *, (ip6_t *)ip);
2975                         pass = FR_BLOCK|FR_NOMATCH;
2976                         fin->fin_reason = FRB_JUMBO;
2977                         goto finished;
2978                 }
2979                 fin->fin_family = AF_INET6;
2980         } else
2981 #endif
2982         {
2983                 fin->fin_family = AF_INET;
2984         }
2985
2986         if (ipf_makefrip(hlen, ip, fin) == -1) {
2987                 DT1(frb_makefrip, fr_info_t *, fin);
2988                 pass = FR_BLOCK|FR_NOMATCH;
2989                 fin->fin_reason = FRB_MAKEFRIP;
2990                 goto finished;
2991         }
2992
2993         /*
2994          * For at least IPv6 packets, if a m_pullup() fails then this pointer
2995          * becomes NULL and so we have no packet to free.
2996          */
2997         if (*fin->fin_mp == NULL)
2998                 goto finished;
2999
3000         if (!out) {
3001                 if (v == 4) {
3002                         if (softc->ipf_chksrc && !ipf_verifysrc(fin)) {
3003                                 LBUMPD(ipf_stats[0], fr_v4_badsrc);
3004                                 fin->fin_flx |= FI_BADSRC;
3005                         }
3006                         if (fin->fin_ip->ip_ttl < softc->ipf_minttl) {
3007                                 LBUMPD(ipf_stats[0], fr_v4_badttl);
3008                                 fin->fin_flx |= FI_LOWTTL;
3009                         }
3010                 }
3011 #ifdef USE_INET6
3012                 else  if (v == 6) {
3013                         if (((ip6_t *)ip)->ip6_hlim < softc->ipf_minttl) {
3014                                 LBUMPD(ipf_stats[0], fr_v6_badttl);
3015                                 fin->fin_flx |= FI_LOWTTL;
3016                         }
3017                 }
3018 #endif
3019         }
3020
3021         if (fin->fin_flx & FI_SHORT) {
3022                 LBUMPD(ipf_stats[out], fr_short);
3023         }
3024
3025         READ_ENTER(&softc->ipf_mutex);
3026
3027         if (!out) {
3028                 switch (fin->fin_v)
3029                 {
3030                 case 4 :
3031                         if (ipf_nat_checkin(fin, &pass) == -1) {
3032                                 goto filterdone;
3033                         }
3034                         break;
3035 #ifdef USE_INET6
3036                 case 6 :
3037                         if (ipf_nat6_checkin(fin, &pass) == -1) {
3038                                 goto filterdone;
3039                         }
3040                         break;
3041 #endif
3042                 default :
3043                         break;
3044                 }
3045         }
3046         /*
3047          * Check auth now.
3048          * If a packet is found in the auth table, then skip checking
3049          * the access lists for permission but we do need to consider
3050          * the result as if it were from the ACL's.  In addition, being
3051          * found in the auth table means it has been seen before, so do
3052          * not pass it through accounting (again), lest it be counted twice.
3053          */
3054         fr = ipf_auth_check(fin, &pass);
3055         if (!out && (fr == NULL))
3056                 (void) ipf_acctpkt(fin, NULL);
3057
3058         if (fr == NULL) {
3059                 if ((fin->fin_flx & FI_FRAG) != 0)
3060                         fr = ipf_frag_known(fin, &pass);
3061
3062                 if (fr == NULL)
3063                         fr = ipf_state_check(fin, &pass);
3064         }
3065
3066         if ((pass & FR_NOMATCH) || (fr == NULL))
3067                 fr = ipf_firewall(fin, &pass);
3068
3069         /*
3070          * If we've asked to track state for this packet, set it up.
3071          * Here rather than ipf_firewall because ipf_checkauth may decide
3072          * to return a packet for "keep state"
3073          */
3074         if ((pass & FR_KEEPSTATE) && (fin->fin_m != NULL) &&
3075             !(fin->fin_flx & FI_STATE)) {
3076                 if (ipf_state_add(softc, fin, NULL, 0) == 0) {
3077                         LBUMP(ipf_stats[out].fr_ads);
3078                 } else {
3079                         LBUMP(ipf_stats[out].fr_bads);
3080                         if (FR_ISPASS(pass)) {
3081                                 DT(frb_stateadd);
3082                                 pass &= ~FR_CMDMASK;
3083                                 pass |= FR_BLOCK;
3084                                 fin->fin_reason = FRB_STATEADD;
3085                         }
3086                 }
3087         }
3088
3089         fin->fin_fr = fr;
3090         if ((fr != NULL) && !(fin->fin_flx & FI_STATE)) {
3091                 fin->fin_dif = &fr->fr_dif;
3092                 fin->fin_tif = &fr->fr_tifs[fin->fin_rev];
3093         }
3094
3095         /*
3096          * Only count/translate packets which will be passed on, out the
3097          * interface.
3098          */
3099         if (out && FR_ISPASS(pass)) {
3100                 (void) ipf_acctpkt(fin, NULL);
3101
3102                 switch (fin->fin_v)
3103                 {
3104                 case 4 :
3105                         if (ipf_nat_checkout(fin, &pass) == -1) {
3106                                 ;
3107                         } else if ((softc->ipf_update_ipid != 0) && (v == 4)) {
3108                                 if (ipf_updateipid(fin) == -1) {
3109                                         DT(frb_updateipid);
3110                                         LBUMP(ipf_stats[1].fr_ipud);
3111                                         pass &= ~FR_CMDMASK;
3112                                         pass |= FR_BLOCK;
3113                                         fin->fin_reason = FRB_UPDATEIPID;
3114                                 } else {
3115                                         LBUMP(ipf_stats[0].fr_ipud);
3116                                 }
3117                         }
3118                         break;
3119 #ifdef USE_INET6
3120                 case 6 :
3121                         (void) ipf_nat6_checkout(fin, &pass);
3122                         break;
3123 #endif
3124                 default :
3125                         break;
3126                 }
3127         }
3128
3129 filterdone:
3130 #ifdef  IPFILTER_LOG
3131         if ((softc->ipf_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
3132                 (void) ipf_dolog(fin, &pass);
3133         }
3134 #endif
3135
3136         /*
3137          * The FI_STATE flag is cleared here so that calling ipf_state_check
3138          * will work when called from inside of fr_fastroute.  Although
3139          * there is a similar flag, FI_NATED, for NAT, it does have the same
3140          * impact on code execution.
3141          */
3142         fin->fin_flx &= ~FI_STATE;
3143
3144 #if defined(FASTROUTE_RECURSION)
3145         /*
3146          * Up the reference on fr_lock and exit ipf_mutex. The generation of
3147          * a packet below can sometimes cause a recursive call into IPFilter.
3148          * On those platforms where that does happen, we need to hang onto
3149          * the filter rule just in case someone decides to remove or flush it
3150          * in the meantime.
3151          */
3152         if (fr != NULL) {
3153                 MUTEX_ENTER(&fr->fr_lock);
3154                 fr->fr_ref++;
3155                 MUTEX_EXIT(&fr->fr_lock);
3156         }
3157
3158         RWLOCK_EXIT(&softc->ipf_mutex);
3159 #endif
3160
3161         if ((pass & FR_RETMASK) != 0) {
3162                 /*
3163                  * Should we return an ICMP packet to indicate error
3164                  * status passing through the packet filter ?
3165                  * WARNING: ICMP error packets AND TCP RST packets should
3166                  * ONLY be sent in repsonse to incoming packets.  Sending
3167                  * them in response to outbound packets can result in a
3168                  * panic on some operating systems.
3169                  */
3170                 if (!out) {
3171                         if (pass & FR_RETICMP) {
3172                                 int dst;
3173
3174                                 if ((pass & FR_RETMASK) == FR_FAKEICMP)
3175                                         dst = 1;
3176                                 else
3177                                         dst = 0;
3178                                 (void) ipf_send_icmp_err(ICMP_UNREACH, fin,
3179                                                          dst);
3180                                 LBUMP(ipf_stats[0].fr_ret);
3181                         } else if (((pass & FR_RETMASK) == FR_RETRST) &&
3182                                    !(fin->fin_flx & FI_SHORT)) {
3183                                 if (((fin->fin_flx & FI_OOW) != 0) ||
3184                                     (ipf_send_reset(fin) == 0)) {
3185                                         LBUMP(ipf_stats[1].fr_ret);
3186                                 }
3187                         }
3188
3189                         /*
3190                          * When using return-* with auth rules, the auth code
3191                          * takes over disposing of this packet.
3192                          */
3193                         if (FR_ISAUTH(pass) && (fin->fin_m != NULL)) {
3194                                 DT1(frb_authcapture, fr_info_t *, fin);
3195                                 fin->fin_m = *fin->fin_mp = NULL;
3196                                 fin->fin_reason = FRB_AUTHCAPTURE;
3197                                 m = NULL;
3198                         }
3199                 } else {
3200                         if (pass & FR_RETRST) {
3201                                 fin->fin_error = ECONNRESET;
3202                         }
3203                 }
3204         }
3205
3206         /*
3207          * After the above so that ICMP unreachables and TCP RSTs get
3208          * created properly.
3209          */
3210         if (FR_ISBLOCK(pass) && (fin->fin_flx & FI_NEWNAT))
3211                 ipf_nat_uncreate(fin);
3212
3213         /*
3214          * If we didn't drop off the bottom of the list of rules (and thus
3215          * the 'current' rule fr is not NULL), then we may have some extra
3216          * instructions about what to do with a packet.
3217          * Once we're finished return to our caller, freeing the packet if
3218          * we are dropping it.
3219          */
3220         if (fr != NULL) {
3221                 frdest_t *fdp;
3222
3223                 /*
3224                  * Generate a duplicated packet first because ipf_fastroute
3225                  * can lead to fin_m being free'd... not good.
3226                  */
3227                 fdp = fin->fin_dif;
3228                 if ((fdp != NULL) && (fdp->fd_ptr != NULL) &&
3229                     (fdp->fd_ptr != (void *)-1)) {
3230                         mc = M_COPY(fin->fin_m);
3231                         if (mc != NULL)
3232                                 ipf_fastroute(mc, &mc, fin, fdp);
3233                 }
3234
3235                 fdp = fin->fin_tif;
3236                 if (!out && (pass & FR_FASTROUTE)) {
3237                         /*
3238                          * For fastroute rule, no destination interface defined
3239                          * so pass NULL as the frdest_t parameter
3240                          */
3241                         (void) ipf_fastroute(fin->fin_m, mp, fin, NULL);
3242                         m = *mp = NULL;
3243                 } else if ((fdp != NULL) && (fdp->fd_ptr != NULL) &&
3244                            (fdp->fd_ptr != (struct ifnet *)-1)) {
3245                         /* this is for to rules: */
3246                         ipf_fastroute(fin->fin_m, mp, fin, fdp);
3247                         m = *mp = NULL;
3248                 }
3249
3250 #if defined(FASTROUTE_RECURSION)
3251                 (void) ipf_derefrule(softc, &fr);
3252 #endif
3253         }
3254 #if !defined(FASTROUTE_RECURSION)
3255         RWLOCK_EXIT(&softc->ipf_mutex);
3256 #endif
3257
3258 finished:
3259         if (!FR_ISPASS(pass)) {
3260                 LBUMP(ipf_stats[out].fr_block);
3261                 if (*mp != NULL) {
3262 #ifdef _KERNEL
3263                         FREE_MB_T(*mp);
3264 #endif
3265                         m = *mp = NULL;
3266                 }
3267         } else {
3268                 LBUMP(ipf_stats[out].fr_pass);
3269 #if defined(_KERNEL) && defined(__sgi)
3270                 if ((fin->fin_hbuf != NULL) &&
3271                     (mtod(fin->fin_m, struct ip *) != fin->fin_ip)) {
3272                         COPYBACK(fin->fin_m, 0, fin->fin_plen, fin->fin_hbuf);
3273                 }
3274 #endif
3275         }
3276
3277         SPL_X(s);
3278
3279 #ifdef _KERNEL
3280         if (FR_ISPASS(pass))
3281                 return 0;
3282         LBUMP(ipf_stats[out].fr_blocked[fin->fin_reason]);
3283         return fin->fin_error;
3284 #else /* _KERNEL */
3285         if (*mp != NULL)
3286                 (*mp)->mb_ifp = fin->fin_ifp;
3287         blockreason = fin->fin_reason;
3288         FR_VERBOSE(("fin_flx %#x pass %#x ", fin->fin_flx, pass));
3289         /*if ((pass & FR_CMDMASK) == (softc->ipf_pass & FR_CMDMASK))*/
3290                 if ((pass & FR_NOMATCH) != 0)
3291                         return 1;
3292
3293         if ((pass & FR_RETMASK) != 0)
3294                 switch (pass & FR_RETMASK)
3295                 {
3296                 case FR_RETRST :
3297                         return 3;
3298                 case FR_RETICMP :
3299                         return 4;
3300                 case FR_FAKEICMP :
3301                         return 5;
3302                 }
3303
3304         switch (pass & FR_CMDMASK)
3305         {
3306         case FR_PASS :
3307                 return 0;
3308         case FR_BLOCK :
3309                 return -1;
3310         case FR_AUTH :
3311                 return -2;
3312         case FR_ACCOUNT :
3313                 return -3;
3314         case FR_PREAUTH :
3315                 return -4;
3316         }
3317         return 2;
3318 #endif /* _KERNEL */
3319 }
3320
3321
3322 #ifdef  IPFILTER_LOG
3323 /* ------------------------------------------------------------------------ */
3324 /* Function:    ipf_dolog                                                   */
3325 /* Returns:     frentry_t* - returns contents of fin_fr (no change made)    */
3326 /* Parameters:  fin(I) - pointer to packet information                      */
3327 /*              passp(IO) - pointer to current/new filter decision (unused) */
3328 /*                                                                          */
3329 /* Checks flags set to see how a packet should be logged, if it is to be    */
3330 /* logged.  Adjust statistics based on its success or not.                  */
3331 /* ------------------------------------------------------------------------ */
3332 frentry_t *
3333 ipf_dolog(fin, passp)
3334         fr_info_t *fin;
3335         u_32_t *passp;
3336 {
3337         ipf_main_softc_t *softc = fin->fin_main_soft;
3338         u_32_t pass;
3339         int out;
3340
3341         out = fin->fin_out;
3342         pass = *passp;
3343
3344         if ((softc->ipf_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
3345                 pass |= FF_LOGNOMATCH;
3346                 LBUMPD(ipf_stats[out], fr_npkl);
3347                 goto logit;
3348
3349         } else if (((pass & FR_LOGMASK) == FR_LOGP) ||
3350             (FR_ISPASS(pass) && (softc->ipf_flags & FF_LOGPASS))) {
3351                 if ((pass & FR_LOGMASK) != FR_LOGP)
3352                         pass |= FF_LOGPASS;
3353                 LBUMPD(ipf_stats[out], fr_ppkl);
3354                 goto logit;
3355
3356         } else if (((pass & FR_LOGMASK) == FR_LOGB) ||
3357                    (FR_ISBLOCK(pass) && (softc->ipf_flags & FF_LOGBLOCK))) {
3358                 if ((pass & FR_LOGMASK) != FR_LOGB)
3359                         pass |= FF_LOGBLOCK;
3360                 LBUMPD(ipf_stats[out], fr_bpkl);
3361
3362 logit:
3363                 if (ipf_log_pkt(fin, pass) == -1) {
3364                         /*
3365                          * If the "or-block" option has been used then
3366                          * block the packet if we failed to log it.
3367                          */
3368                         if ((pass & FR_LOGORBLOCK) && FR_ISPASS(pass)) {
3369                                 DT1(frb_logfail2, u_int, pass);
3370                                 pass &= ~FR_CMDMASK;
3371                                 pass |= FR_BLOCK;
3372                                 fin->fin_reason = FRB_LOGFAIL2;
3373                         }
3374                 }
3375                 *passp = pass;
3376         }
3377
3378         return fin->fin_fr;
3379 }
3380 #endif /* IPFILTER_LOG */
3381
3382
3383 /* ------------------------------------------------------------------------ */
3384 /* Function:    ipf_cksum                                                   */
3385 /* Returns:     u_short - IP header checksum                                */
3386 /* Parameters:  addr(I) - pointer to start of buffer to checksum            */
3387 /*              len(I)  - length of buffer in bytes                         */
3388 /*                                                                          */
3389 /* Calculate the two's complement 16 bit checksum of the buffer passed.     */
3390 /*                                                                          */
3391 /* N.B.: addr should be 16bit aligned.                                      */
3392 /* ------------------------------------------------------------------------ */
3393 u_short
3394 ipf_cksum(addr, len)
3395         u_short *addr;
3396         int len;
3397 {
3398         u_32_t sum = 0;
3399
3400         for (sum = 0; len > 1; len -= 2)
3401                 sum += *addr++;
3402
3403         /* mop up an odd byte, if necessary */
3404         if (len == 1)
3405                 sum += *(u_char *)addr;
3406
3407         /*
3408          * add back carry outs from top 16 bits to low 16 bits
3409          */
3410         sum = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
3411         sum += (sum >> 16);                     /* add carry */
3412         return (u_short)(~sum);
3413 }
3414
3415
3416 /* ------------------------------------------------------------------------ */
3417 /* Function:    fr_cksum                                                    */
3418 /* Returns:     u_short - layer 4 checksum                                  */
3419 /* Parameters:  fin(I)     - pointer to packet information                  */
3420 /*              ip(I)      - pointer to IP header                           */
3421 /*              l4proto(I) - protocol to caclulate checksum for             */
3422 /*              l4hdr(I)   - pointer to layer 4 header                      */
3423 /*                                                                          */
3424 /* Calculates the TCP checksum for the packet held in "m", using the data   */
3425 /* in the IP header "ip" to seed it.                                        */
3426 /*                                                                          */
3427 /* NB: This function assumes we've pullup'd enough for all of the IP header */
3428 /* and the TCP header.  We also assume that data blocks aren't allocated in */
3429 /* odd sizes.                                                               */
3430 /*                                                                          */
3431 /* Expects ip_len and ip_off to be in network byte order when called.       */
3432 /* ------------------------------------------------------------------------ */
3433 u_short
3434 fr_cksum(fin, ip, l4proto, l4hdr)
3435         fr_info_t *fin;
3436         ip_t *ip;
3437         int l4proto;
3438         void *l4hdr;
3439 {
3440         u_short *sp, slen, sumsave, *csump;
3441         u_int sum, sum2;
3442         int hlen;
3443         int off;
3444 #ifdef  USE_INET6
3445         ip6_t *ip6;
3446 #endif
3447
3448         csump = NULL;
3449         sumsave = 0;
3450         sp = NULL;
3451         slen = 0;
3452         hlen = 0;
3453         sum = 0;
3454
3455         sum = htons((u_short)l4proto);
3456         /*
3457          * Add up IP Header portion
3458          */
3459 #ifdef  USE_INET6
3460         if (IP_V(ip) == 4) {
3461 #endif
3462                 hlen = IP_HL(ip) << 2;
3463                 off = hlen;
3464                 sp = (u_short *)&ip->ip_src;
3465                 sum += *sp++;   /* ip_src */
3466                 sum += *sp++;
3467                 sum += *sp++;   /* ip_dst */
3468                 sum += *sp++;
3469 #ifdef  USE_INET6
3470         } else if (IP_V(ip) == 6) {
3471                 ip6 = (ip6_t *)ip;
3472                 hlen = sizeof(*ip6);
3473                 off = ((char *)fin->fin_dp - (char *)fin->fin_ip);
3474                 sp = (u_short *)&ip6->ip6_src;
3475                 sum += *sp++;   /* ip6_src */
3476                 sum += *sp++;
3477                 sum += *sp++;
3478                 sum += *sp++;
3479                 sum += *sp++;
3480                 sum += *sp++;
3481                 sum += *sp++;
3482                 sum += *sp++;
3483                 /* This needs to be routing header aware. */
3484                 sum += *sp++;   /* ip6_dst */
3485                 sum += *sp++;
3486                 sum += *sp++;
3487                 sum += *sp++;
3488                 sum += *sp++;
3489                 sum += *sp++;
3490                 sum += *sp++;
3491                 sum += *sp++;
3492         } else {
3493                 return 0xffff;
3494         }
3495 #endif
3496         slen = fin->fin_plen - off;
3497         sum += htons(slen);
3498
3499         switch (l4proto)
3500         {
3501         case IPPROTO_UDP :
3502                 csump = &((udphdr_t *)l4hdr)->uh_sum;
3503                 break;
3504
3505         case IPPROTO_TCP :
3506                 csump = &((tcphdr_t *)l4hdr)->th_sum;
3507                 break;
3508         case IPPROTO_ICMP :
3509                 csump = &((icmphdr_t *)l4hdr)->icmp_cksum;
3510                 sum = 0;        /* Pseudo-checksum is not included */
3511                 break;
3512 #ifdef USE_INET6
3513         case IPPROTO_ICMPV6 :
3514                 csump = &((struct icmp6_hdr *)l4hdr)->icmp6_cksum;
3515                 break;
3516 #endif
3517         default :
3518                 break;
3519         }
3520
3521         if (csump != NULL) {
3522                 sumsave = *csump;
3523                 *csump = 0;
3524         }
3525
3526         sum2 = ipf_pcksum(fin, off, sum);
3527         if (csump != NULL)
3528                 *csump = sumsave;
3529         return sum2;
3530 }
3531
3532
3533 /* ------------------------------------------------------------------------ */
3534 /* Function:    ipf_findgroup                                               */
3535 /* Returns:     frgroup_t * - NULL = group not found, else pointer to group */
3536 /* Parameters:  softc(I) - pointer to soft context main structure           */
3537 /*              group(I) - group name to search for                         */
3538 /*              unit(I)  - device to which this group belongs               */
3539 /*              set(I)   - which set of rules (inactive/inactive) this is   */
3540 /*              fgpp(O)  - pointer to place to store pointer to the pointer */
3541 /*                         to where to add the next (last) group or where   */
3542 /*                         to delete group from.                            */
3543 /*                                                                          */
3544 /* Search amongst the defined groups for a particular group number.         */
3545 /* ------------------------------------------------------------------------ */
3546 frgroup_t *
3547 ipf_findgroup(softc, group, unit, set, fgpp)
3548         ipf_main_softc_t *softc;
3549         char *group;
3550         minor_t unit;
3551         int set;
3552         frgroup_t ***fgpp;
3553 {
3554         frgroup_t *fg, **fgp;
3555
3556         /*
3557          * Which list of groups to search in is dependent on which list of
3558          * rules are being operated on.
3559          */
3560         fgp = &softc->ipf_groups[unit][set];
3561
3562         while ((fg = *fgp) != NULL) {
3563                 if (strncmp(group, fg->fg_name, FR_GROUPLEN) == 0)
3564                         break;
3565                 else
3566                         fgp = &fg->fg_next;
3567         }
3568         if (fgpp != NULL)
3569                 *fgpp = fgp;
3570         return fg;
3571 }
3572
3573
3574 /* ------------------------------------------------------------------------ */
3575 /* Function:    ipf_group_add                                               */
3576 /* Returns:     frgroup_t * - NULL == did not create group,                 */
3577 /*                            != NULL == pointer to the group               */
3578 /* Parameters:  softc(I) - pointer to soft context main structure           */
3579 /*              num(I)   - group number to add                              */
3580 /*              head(I)  - rule pointer that is using this as the head      */
3581 /*              flags(I) - rule flags which describe the type of rule it is */
3582 /*              unit(I)  - device to which this group will belong to        */
3583 /*              set(I)   - which set of rules (inactive/inactive) this is   */
3584 /* Write Locks: ipf_mutex                                                   */
3585 /*                                                                          */
3586 /* Add a new group head, or if it already exists, increase the reference    */
3587 /* count to it.                                                             */
3588 /* ------------------------------------------------------------------------ */
3589 frgroup_t *
3590 ipf_group_add(softc, group, head, flags, unit, set)
3591         ipf_main_softc_t *softc;
3592         char *group;
3593         void *head;
3594         u_32_t flags;
3595         minor_t unit;
3596         int set;
3597 {
3598         frgroup_t *fg, **fgp;
3599         u_32_t gflags;
3600
3601         if (group == NULL)
3602                 return NULL;
3603
3604         if (unit == IPL_LOGIPF && *group == '\0')
3605                 return NULL;
3606
3607         fgp = NULL;
3608         gflags = flags & FR_INOUT;
3609
3610         fg = ipf_findgroup(softc, group, unit, set, &fgp);
3611         if (fg != NULL) {
3612                 if (fg->fg_head == NULL && head != NULL)
3613                         fg->fg_head = head;
3614                 if (fg->fg_flags == 0)
3615                         fg->fg_flags = gflags;
3616                 else if (gflags != fg->fg_flags)
3617                         return NULL;
3618                 fg->fg_ref++;
3619                 return fg;
3620         }
3621
3622         KMALLOC(fg, frgroup_t *);
3623         if (fg != NULL) {
3624                 fg->fg_head = head;
3625                 fg->fg_start = NULL;
3626                 fg->fg_next = *fgp;
3627                 bcopy(group, fg->fg_name, strlen(group) + 1);
3628                 fg->fg_flags = gflags;
3629                 fg->fg_ref = 1;
3630                 fg->fg_set = &softc->ipf_groups[unit][set];
3631                 *fgp = fg;
3632         }
3633         return fg;
3634 }
3635
3636
3637 /* ------------------------------------------------------------------------ */
3638 /* Function:    ipf_group_del                                               */
3639 /* Returns:     int      - number of rules deleted                          */
3640 /* Parameters:  softc(I) - pointer to soft context main structure           */
3641 /*              group(I) - group name to delete                             */
3642 /*              fr(I)    - filter rule from which group is referenced       */
3643 /* Write Locks: ipf_mutex                                                   */
3644 /*                                                                          */
3645 /* This function is called whenever a reference to a group is to be dropped */
3646 /* and thus its reference count needs to be lowered and the group free'd if */
3647 /* the reference count reaches zero. Passing in fr is really for the sole   */
3648 /* purpose of knowing when the head rule is being deleted.                  */
3649 /* ------------------------------------------------------------------------ */
3650 void
3651 ipf_group_del(softc, group, fr)
3652         ipf_main_softc_t *softc;
3653         frgroup_t *group;
3654         frentry_t *fr;
3655 {
3656
3657         if (group->fg_head == fr)
3658                 group->fg_head = NULL;
3659
3660         group->fg_ref--;
3661         if ((group->fg_ref == 0) && (group->fg_start == NULL))
3662                 ipf_group_free(group);
3663 }
3664
3665
3666 /* ------------------------------------------------------------------------ */
3667 /* Function:    ipf_group_free                                              */
3668 /* Returns:     Nil                                                         */
3669 /* Parameters:  group(I) - pointer to filter rule group                     */
3670 /*                                                                          */
3671 /* Remove the group from the list of groups and free it.                    */
3672 /* ------------------------------------------------------------------------ */
3673 static void
3674 ipf_group_free(group)
3675         frgroup_t *group;
3676 {
3677         frgroup_t **gp;
3678
3679         for (gp = group->fg_set; *gp != NULL; gp = &(*gp)->fg_next) {
3680                 if (*gp == group) {
3681                         *gp = group->fg_next;
3682                         break;
3683                 }
3684         }
3685         KFREE(group);
3686 }
3687
3688
3689 /* ------------------------------------------------------------------------ */
3690 /* Function:    ipf_group_flush                                             */
3691 /* Returns:     int      - number of rules flush from group                 */
3692 /* Parameters:  softc(I) - pointer to soft context main structure           */
3693 /* Parameters:  group(I) - pointer to filter rule group                     */
3694 /*                                                                          */
3695 /* Remove all of the rules that currently are listed under the given group. */
3696 /* ------------------------------------------------------------------------ */
3697 static int
3698 ipf_group_flush(softc, group)
3699         ipf_main_softc_t *softc;
3700         frgroup_t *group;
3701 {
3702         int gone = 0;
3703
3704         (void) ipf_flushlist(softc, &gone, &group->fg_start);
3705
3706         return gone;
3707 }
3708
3709
3710 /* ------------------------------------------------------------------------ */
3711 /* Function:    ipf_getrulen                                                */
3712 /* Returns:     frentry_t * - NULL == not found, else pointer to rule n     */
3713 /* Parameters:  softc(I) - pointer to soft context main structure           */
3714 /* Parameters:  unit(I)  - device for which to count the rule's number      */
3715 /*              flags(I) - which set of rules to find the rule in           */
3716 /*              group(I) - group name                                       */
3717 /*              n(I)     - rule number to find                              */
3718 /*                                                                          */
3719 /* Find rule # n in group # g and return a pointer to it.  Return NULl if   */
3720 /* group # g doesn't exist or there are less than n rules in the group.     */
3721 /* ------------------------------------------------------------------------ */
3722 frentry_t *
3723 ipf_getrulen(softc, unit, group, n)
3724         ipf_main_softc_t *softc;
3725         int unit;
3726         char *group;
3727         u_32_t n;
3728 {
3729         frentry_t *fr;
3730         frgroup_t *fg;
3731
3732         fg = ipf_findgroup(softc, group, unit, softc->ipf_active, NULL);
3733         if (fg == NULL)
3734                 return NULL;
3735         for (fr = fg->fg_start; fr && n; fr = fr->fr_next, n--)
3736                 ;
3737         if (n != 0)
3738                 return NULL;
3739         return fr;
3740 }
3741
3742
3743 /* ------------------------------------------------------------------------ */
3744 /* Function:    ipf_flushlist                                               */
3745 /* Returns:     int - >= 0 - number of flushed rules                        */
3746 /* Parameters:  softc(I)   - pointer to soft context main structure         */
3747 /*              nfreedp(O) - pointer to int where flush count is stored     */
3748 /*              listp(I)   - pointer to list to flush pointer               */
3749 /* Write Locks: ipf_mutex                                                   */
3750 /*                                                                          */
3751 /* Recursively flush rules from the list, descending groups as they are     */
3752 /* encountered.  if a rule is the head of a group and it has lost all its   */
3753 /* group members, then also delete the group reference.  nfreedp is needed  */
3754 /* to store the accumulating count of rules removed, whereas the returned   */
3755 /* value is just the number removed from the current list.  The latter is   */
3756 /* needed to correctly adjust reference counts on rules that define groups. */
3757 /*                                                                          */
3758 /* NOTE: Rules not loaded from user space cannot be flushed.                */
3759 /* ------------------------------------------------------------------------ */
3760 static int
3761 ipf_flushlist(softc, nfreedp, listp)
3762         ipf_main_softc_t *softc;
3763         int *nfreedp;
3764         frentry_t **listp;
3765 {
3766         int freed = 0;
3767         frentry_t *fp;
3768
3769         while ((fp = *listp) != NULL) {
3770                 if ((fp->fr_type & FR_T_BUILTIN) ||
3771                     !(fp->fr_flags & FR_COPIED)) {
3772                         listp = &fp->fr_next;
3773                         continue;
3774                 }
3775                 *listp = fp->fr_next;
3776                 if (fp->fr_next != NULL)
3777                         fp->fr_next->fr_pnext = fp->fr_pnext;
3778                 fp->fr_pnext = NULL;
3779
3780                 if (fp->fr_grphead != NULL) {
3781                         freed += ipf_group_flush(softc, fp->fr_grphead);
3782                         fp->fr_names[fp->fr_grhead] = '\0';
3783                 }
3784
3785                 if (fp->fr_icmpgrp != NULL) {
3786                         freed += ipf_group_flush(softc, fp->fr_icmpgrp);
3787                         fp->fr_names[fp->fr_icmphead] = '\0';
3788                 }
3789
3790                 if (fp->fr_srctrack.ht_max_nodes)
3791                         ipf_rb_ht_flush(&fp->fr_srctrack);
3792
3793                 fp->fr_next = NULL;
3794
3795                 ASSERT(fp->fr_ref > 0);
3796                 if (ipf_derefrule(softc, &fp) == 0)
3797                         freed++;
3798         }
3799         *nfreedp += freed;
3800         return freed;
3801 }
3802
3803
3804 /* ------------------------------------------------------------------------ */
3805 /* Function:    ipf_flush                                                   */
3806 /* Returns:     int - >= 0 - number of flushed rules                        */
3807 /* Parameters:  softc(I) - pointer to soft context main structure           */
3808 /*              unit(I)  - device for which to flush rules                  */
3809 /*              flags(I) - which set of rules to flush                      */
3810 /*                                                                          */
3811 /* Calls flushlist() for all filter rules (accounting, firewall - both IPv4 */
3812 /* and IPv6) as defined by the value of flags.                              */
3813 /* ------------------------------------------------------------------------ */
3814 int
3815 ipf_flush(softc, unit, flags)
3816         ipf_main_softc_t *softc;
3817         minor_t unit;
3818         int flags;
3819 {
3820         int flushed = 0, set;
3821
3822         WRITE_ENTER(&softc->ipf_mutex);
3823
3824         set = softc->ipf_active;
3825         if ((flags & FR_INACTIVE) == FR_INACTIVE)
3826                 set = 1 - set;
3827
3828         if (flags & FR_OUTQUE) {
3829                 ipf_flushlist(softc, &flushed, &softc->ipf_rules[1][set]);
3830                 ipf_flushlist(softc, &flushed, &softc->ipf_acct[1][set]);
3831         }
3832         if (flags & FR_INQUE) {
3833                 ipf_flushlist(softc, &flushed, &softc->ipf_rules[0][set]);
3834                 ipf_flushlist(softc, &flushed, &softc->ipf_acct[0][set]);
3835         }
3836
3837         flushed += ipf_flush_groups(softc, &softc->ipf_groups[unit][set],
3838                                     flags & (FR_INQUE|FR_OUTQUE));
3839
3840         RWLOCK_EXIT(&softc->ipf_mutex);
3841
3842         if (unit == IPL_LOGIPF) {
3843                 int tmp;
3844
3845                 tmp = ipf_flush(softc, IPL_LOGCOUNT, flags);
3846                 if (tmp >= 0)
3847                         flushed += tmp;
3848         }
3849         return flushed;
3850 }
3851
3852
3853 /* ------------------------------------------------------------------------ */
3854 /* Function:    ipf_flush_groups                                            */
3855 /* Returns:     int - >= 0 - number of flushed rules                        */
3856 /* Parameters:  softc(I)  - soft context pointerto work with                */
3857 /*              grhead(I) - pointer to the start of the group list to flush */
3858 /*              flags(I)  - which set of rules to flush                     */
3859 /*                                                                          */
3860 /* Walk through all of the groups under the given group head and remove all */
3861 /* of those that match the flags passed in. The for loop here is bit more   */
3862 /* complicated than usual because the removal of a rule with ipf_derefrule  */
3863 /* may end up removing not only the structure pointed to by "fg" but also   */
3864 /* what is fg_next and fg_next after that. So if a filter rule is actually  */
3865 /* removed from the group then it is necessary to start again.              */
3866 /* ------------------------------------------------------------------------ */
3867 static int
3868 ipf_flush_groups(softc, grhead, flags)
3869         ipf_main_softc_t *softc;
3870         frgroup_t **grhead;
3871         int flags;
3872 {
3873         frentry_t *fr, **frp;
3874         frgroup_t *fg, **fgp;
3875         int flushed = 0;
3876         int removed = 0;
3877
3878         for (fgp = grhead; (fg = *fgp) != NULL; ) {
3879                 while ((fg != NULL) && ((fg->fg_flags & flags) == 0))
3880                         fg = fg->fg_next;
3881                 if (fg == NULL)
3882                         break;
3883                 removed = 0;
3884                 frp = &fg->fg_start;
3885                 while ((removed == 0) && ((fr = *frp) != NULL)) {
3886                         if ((fr->fr_flags & flags) == 0) {
3887                                 frp = &fr->fr_next;
3888                         } else {
3889                                 if (fr->fr_next != NULL)
3890                                         fr->fr_next->fr_pnext = fr->fr_pnext;
3891                                 *frp = fr->fr_next;
3892                                 fr->fr_pnext = NULL;
3893                                 fr->fr_next = NULL;
3894                                 (void) ipf_derefrule(softc, &fr);
3895                                 flushed++;
3896                                 removed++;
3897                         }
3898                 }
3899                 if (removed == 0)
3900                         fgp = &fg->fg_next;
3901         }
3902         return flushed;
3903 }
3904
3905
3906 /* ------------------------------------------------------------------------ */
3907 /* Function:    memstr                                                      */
3908 /* Returns:     char *  - NULL if failed, != NULL pointer to matching bytes */
3909 /* Parameters:  src(I)  - pointer to byte sequence to match                 */
3910 /*              dst(I)  - pointer to byte sequence to search                */
3911 /*              slen(I) - match length                                      */
3912 /*              dlen(I) - length available to search in                     */
3913 /*                                                                          */
3914 /* Search dst for a sequence of bytes matching those at src and extend for  */
3915 /* slen bytes.                                                              */
3916 /* ------------------------------------------------------------------------ */
3917 char *
3918 memstr(src, dst, slen, dlen)
3919         const char *src;
3920         char *dst;
3921         size_t slen, dlen;
3922 {
3923         char *s = NULL;
3924
3925         while (dlen >= slen) {
3926                 if (bcmp(src, dst, slen) == 0) {
3927                         s = dst;
3928                         break;
3929                 }
3930                 dst++;
3931                 dlen--;
3932         }
3933         return s;
3934 }
3935 /* ------------------------------------------------------------------------ */
3936 /* Function:    ipf_fixskip                                                 */
3937 /* Returns:     Nil                                                         */
3938 /* Parameters:  listp(IO)    - pointer to start of list with skip rule      */
3939 /*              rp(I)        - rule added/removed with skip in it.          */
3940 /*              addremove(I) - adjustment (-1/+1) to make to skip count,    */
3941 /*                             depending on whether a rule was just added   */
3942 /*                             or removed.                                  */
3943 /*                                                                          */
3944 /* Adjust all the rules in a list which would have skip'd past the position */
3945 /* where we are inserting to skip to the right place given the change.      */
3946 /* ------------------------------------------------------------------------ */
3947 void
3948 ipf_fixskip(listp, rp, addremove)
3949         frentry_t **listp, *rp;
3950         int addremove;
3951 {
3952         int rules, rn;
3953         frentry_t *fp;
3954
3955         rules = 0;
3956         for (fp = *listp; (fp != NULL) && (fp != rp); fp = fp->fr_next)
3957                 rules++;
3958
3959         if (!fp)
3960                 return;
3961
3962         for (rn = 0, fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
3963                 if (FR_ISSKIP(fp->fr_flags) && (rn + fp->fr_arg >= rules))
3964                         fp->fr_arg += addremove;
3965 }
3966
3967
3968 #ifdef  _KERNEL
3969 /* ------------------------------------------------------------------------ */
3970 /* Function:    count4bits                                                  */
3971 /* Returns:     int - >= 0 - number of consecutive bits in input            */
3972 /* Parameters:  ip(I) - 32bit IP address                                    */
3973 /*                                                                          */
3974 /* IPv4 ONLY                                                                */
3975 /* count consecutive 1's in bit mask.  If the mask generated by counting    */
3976 /* consecutive 1's is different to that passed, return -1, else return #    */
3977 /* of bits.                                                                 */
3978 /* ------------------------------------------------------------------------ */
3979 int
3980 count4bits(ip)
3981         u_32_t  ip;
3982 {
3983         u_32_t  ipn;
3984         int     cnt = 0, i, j;
3985
3986         ip = ipn = ntohl(ip);
3987         for (i = 32; i; i--, ipn *= 2)
3988                 if (ipn & 0x80000000)
3989                         cnt++;
3990                 else
3991                         break;
3992         ipn = 0;
3993         for (i = 32, j = cnt; i; i--, j--) {
3994                 ipn *= 2;
3995                 if (j > 0)
3996                         ipn++;
3997         }
3998         if (ipn == ip)
3999                 return cnt;
4000         return -1;
4001 }
4002
4003
4004 /* ------------------------------------------------------------------------ */
4005 /* Function:    count6bits                                                  */
4006 /* Returns:     int - >= 0 - number of consecutive bits in input            */
4007 /* Parameters:  msk(I) - pointer to start of IPv6 bitmask                   */
4008 /*                                                                          */
4009 /* IPv6 ONLY                                                                */
4010 /* count consecutive 1's in bit mask.                                       */
4011 /* ------------------------------------------------------------------------ */
4012 # ifdef USE_INET6
4013 int
4014 count6bits(msk)
4015         u_32_t *msk;
4016 {
4017         int i = 0, k;
4018         u_32_t j;
4019
4020         for (k = 3; k >= 0; k--)
4021                 if (msk[k] == 0xffffffff)
4022                         i += 32;
4023                 else {
4024                         for (j = msk[k]; j; j <<= 1)
4025                                 if (j & 0x80000000)
4026                                         i++;
4027                 }
4028         return i;
4029 }
4030 # endif
4031 #endif /* _KERNEL */
4032
4033
4034 /* ------------------------------------------------------------------------ */
4035 /* Function:    ipf_synclist                                                */
4036 /* Returns:     int    - 0 = no failures, else indication of first failure  */
4037 /* Parameters:  fr(I)  - start of filter list to sync interface names for   */
4038 /*              ifp(I) - interface pointer for limiting sync lookups        */
4039 /* Write Locks: ipf_mutex                                                   */
4040 /*                                                                          */
4041 /* Walk through a list of filter rules and resolve any interface names into */
4042 /* pointers.  Where dynamic addresses are used, also update the IP address  */
4043 /* used in the rule.  The interface pointer is used to limit the lookups to */
4044 /* a specific set of matching names if it is non-NULL.                      */
4045 /* Errors can occur when resolving the destination name of to/dup-to fields */
4046 /* when the name points to a pool and that pool doest not exist. If this    */
4047 /* does happen then it is necessary to check if there are any lookup refs   */
4048 /* that need to be dropped before returning with an error.                  */
4049 /* ------------------------------------------------------------------------ */
4050 static int
4051 ipf_synclist(softc, fr, ifp)
4052         ipf_main_softc_t *softc;
4053         frentry_t *fr;
4054         void *ifp;
4055 {
4056         frentry_t *frt, *start = fr;
4057         frdest_t *fdp;
4058         char *name;
4059         int error;
4060         void *ifa;
4061         int v, i;
4062
4063         error = 0;
4064
4065         for (; fr; fr = fr->fr_next) {
4066                 if (fr->fr_family == AF_INET)
4067                         v = 4;
4068                 else if (fr->fr_family == AF_INET6)
4069                         v = 6;
4070                 else
4071                         v = 0;
4072
4073                 /*
4074                  * Lookup all the interface names that are part of the rule.
4075                  */
4076                 for (i = 0; i < 4; i++) {
4077                         if ((ifp != NULL) && (fr->fr_ifas[i] != ifp))
4078                                 continue;
4079                         if (fr->fr_ifnames[i] == -1)
4080                                 continue;
4081                         name = FR_NAME(fr, fr_ifnames[i]);
4082                         fr->fr_ifas[i] = ipf_resolvenic(softc, name, v);
4083                 }
4084
4085                 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) {
4086                         if (fr->fr_satype != FRI_NORMAL &&
4087                             fr->fr_satype != FRI_LOOKUP) {
4088                                 ifa = ipf_resolvenic(softc, fr->fr_names +
4089                                                      fr->fr_sifpidx, v);
4090                                 ipf_ifpaddr(softc, v, fr->fr_satype, ifa,
4091                                             &fr->fr_src6, &fr->fr_smsk6);
4092                         }
4093                         if (fr->fr_datype != FRI_NORMAL &&
4094                             fr->fr_datype != FRI_LOOKUP) {
4095                                 ifa = ipf_resolvenic(softc, fr->fr_names +
4096                                                      fr->fr_sifpidx, v);
4097                                 ipf_ifpaddr(softc, v, fr->fr_datype, ifa,
4098                                             &fr->fr_dst6, &fr->fr_dmsk6);
4099                         }
4100                 }
4101
4102                 fdp = &fr->fr_tifs[0];
4103                 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4104                         error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4105                         if (error != 0)
4106                                 goto unwind;
4107                 }
4108
4109                 fdp = &fr->fr_tifs[1];
4110                 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4111                         error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4112                         if (error != 0)
4113                                 goto unwind;
4114                 }
4115
4116                 fdp = &fr->fr_dif;
4117                 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4118                         error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4119                         if (error != 0)
4120                                 goto unwind;
4121                 }
4122
4123                 if (((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4124                     (fr->fr_satype == FRI_LOOKUP) && (fr->fr_srcptr == NULL)) {
4125                         fr->fr_srcptr = ipf_lookup_res_num(softc,
4126                                                            fr->fr_srctype,
4127                                                            IPL_LOGIPF,
4128                                                            fr->fr_srcnum,
4129                                                            &fr->fr_srcfunc);
4130                 }
4131                 if (((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4132                     (fr->fr_datype == FRI_LOOKUP) && (fr->fr_dstptr == NULL)) {
4133                         fr->fr_dstptr = ipf_lookup_res_num(softc,
4134                                                            fr->fr_dsttype,
4135                                                            IPL_LOGIPF,
4136                                                            fr->fr_dstnum,
4137                                                            &fr->fr_dstfunc);
4138                 }
4139         }
4140         return 0;
4141
4142 unwind:
4143         for (frt = start; frt != fr; fr = fr->fr_next) {
4144                 if (((frt->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4145                     (frt->fr_satype == FRI_LOOKUP) && (frt->fr_srcptr != NULL))
4146                                 ipf_lookup_deref(softc, frt->fr_srctype,
4147                                                  frt->fr_srcptr);
4148                 if (((frt->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4149                     (frt->fr_datype == FRI_LOOKUP) && (frt->fr_dstptr != NULL))
4150                                 ipf_lookup_deref(softc, frt->fr_dsttype,
4151                                                  frt->fr_dstptr);
4152         }
4153         return error;
4154 }
4155
4156
4157 /* ------------------------------------------------------------------------ */
4158 /* Function:    ipf_sync                                                    */
4159 /* Returns:     void                                                        */
4160 /* Parameters:  Nil                                                         */
4161 /*                                                                          */
4162 /* ipf_sync() is called when we suspect that the interface list or          */
4163 /* information about interfaces (like IP#) has changed.  Go through all     */
4164 /* filter rules, NAT entries and the state table and check if anything      */
4165 /* needs to be changed/updated.                                             */
4166 /* ------------------------------------------------------------------------ */
4167 int
4168 ipf_sync(softc, ifp)
4169         ipf_main_softc_t *softc;
4170         void *ifp;
4171 {
4172         int i;
4173
4174 # if !SOLARIS
4175         ipf_nat_sync(softc, ifp);
4176         ipf_state_sync(softc, ifp);
4177         ipf_lookup_sync(softc, ifp);
4178 # endif
4179
4180         WRITE_ENTER(&softc->ipf_mutex);
4181         (void) ipf_synclist(softc, softc->ipf_acct[0][softc->ipf_active], ifp);
4182         (void) ipf_synclist(softc, softc->ipf_acct[1][softc->ipf_active], ifp);
4183         (void) ipf_synclist(softc, softc->ipf_rules[0][softc->ipf_active], ifp);
4184         (void) ipf_synclist(softc, softc->ipf_rules[1][softc->ipf_active], ifp);
4185
4186         for (i = 0; i < IPL_LOGSIZE; i++) {
4187                 frgroup_t *g;
4188
4189                 for (g = softc->ipf_groups[i][0]; g != NULL; g = g->fg_next)
4190                         (void) ipf_synclist(softc, g->fg_start, ifp);
4191                 for (g = softc->ipf_groups[i][1]; g != NULL; g = g->fg_next)
4192                         (void) ipf_synclist(softc, g->fg_start, ifp);
4193         }
4194         RWLOCK_EXIT(&softc->ipf_mutex);
4195
4196         return 0;
4197 }
4198
4199
4200 /*
4201  * In the functions below, bcopy() is called because the pointer being
4202  * copied _from_ in this instance is a pointer to a char buf (which could
4203  * end up being unaligned) and on the kernel's local stack.
4204  */
4205 /* ------------------------------------------------------------------------ */
4206 /* Function:    copyinptr                                                   */
4207 /* Returns:     int - 0 = success, else failure                             */
4208 /* Parameters:  src(I)  - pointer to the source address                     */
4209 /*              dst(I)  - destination address                               */
4210 /*              size(I) - number of bytes to copy                           */
4211 /*                                                                          */
4212 /* Copy a block of data in from user space, given a pointer to the pointer  */
4213 /* to start copying from (src) and a pointer to where to store it (dst).    */
4214 /* NB: src - pointer to user space pointer, dst - kernel space pointer      */
4215 /* ------------------------------------------------------------------------ */
4216 int
4217 copyinptr(softc, src, dst, size)
4218         ipf_main_softc_t *softc;
4219         void *src, *dst;
4220         size_t size;
4221 {
4222         caddr_t ca;
4223         int error;
4224
4225 # if SOLARIS
4226         error = COPYIN(src, &ca, sizeof(ca));
4227         if (error != 0)
4228                 return error;
4229 # else
4230         bcopy(src, (caddr_t)&ca, sizeof(ca));
4231 # endif
4232         error = COPYIN(ca, dst, size);
4233         if (error != 0) {
4234                 IPFERROR(3);
4235                 error = EFAULT;
4236         }
4237         return error;
4238 }
4239
4240
4241 /* ------------------------------------------------------------------------ */
4242 /* Function:    copyoutptr                                                  */
4243 /* Returns:     int - 0 = success, else failure                             */
4244 /* Parameters:  src(I)  - pointer to the source address                     */
4245 /*              dst(I)  - destination address                               */
4246 /*              size(I) - number of bytes to copy                           */
4247 /*                                                                          */
4248 /* Copy a block of data out to user space, given a pointer to the pointer   */
4249 /* to start copying from (src) and a pointer to where to store it (dst).    */
4250 /* NB: src - kernel space pointer, dst - pointer to user space pointer.     */
4251 /* ------------------------------------------------------------------------ */
4252 int
4253 copyoutptr(softc, src, dst, size)
4254         ipf_main_softc_t *softc;
4255         void *src, *dst;
4256         size_t size;
4257 {
4258         caddr_t ca;
4259         int error;
4260
4261         bcopy(dst, (caddr_t)&ca, sizeof(ca));
4262         error = COPYOUT(src, ca, size);
4263         if (error != 0) {
4264                 IPFERROR(4);
4265                 error = EFAULT;
4266         }
4267         return error;
4268 }
4269
4270
4271 /* ------------------------------------------------------------------------ */
4272 /* Function:    ipf_lock                                                    */
4273 /* Returns:     int      - 0 = success, else error                          */
4274 /* Parameters:  data(I)  - pointer to lock value to set                     */
4275 /*              lockp(O) - pointer to location to store old lock value      */
4276 /*                                                                          */
4277 /* Get the new value for the lock integer, set it and return the old value  */
4278 /* in *lockp.                                                               */
4279 /* ------------------------------------------------------------------------ */
4280 int
4281 ipf_lock(data, lockp)
4282         caddr_t data;
4283         int *lockp;
4284 {
4285         int arg, err;
4286
4287         err = BCOPYIN(data, &arg, sizeof(arg));
4288         if (err != 0)
4289                 return EFAULT;
4290         err = BCOPYOUT(lockp, data, sizeof(*lockp));
4291         if (err != 0)
4292                 return EFAULT;
4293         *lockp = arg;
4294         return 0;
4295 }
4296
4297
4298 /* ------------------------------------------------------------------------ */
4299 /* Function:    ipf_getstat                                                 */
4300 /* Returns:     Nil                                                         */
4301 /* Parameters:  softc(I) - pointer to soft context main structure           */
4302 /*              fiop(I)  - pointer to ipfilter stats structure              */
4303 /*              rev(I)   - version claim by program doing ioctl             */
4304 /*                                                                          */
4305 /* Stores a copy of current pointers, counters, etc, in the friostat        */
4306 /* structure.                                                               */
4307 /* If IPFILTER_COMPAT is compiled, we pretend to be whatever version the    */
4308 /* program is looking for. This ensure that validation of the version it    */
4309 /* expects will always succeed. Thus kernels with IPFILTER_COMPAT will      */
4310 /* allow older binaries to work but kernels without it will not.            */
4311 /* ------------------------------------------------------------------------ */
4312 /*ARGSUSED*/
4313 static void
4314 ipf_getstat(softc, fiop, rev)
4315         ipf_main_softc_t *softc;
4316         friostat_t *fiop;
4317         int rev;
4318 {
4319         int i;
4320
4321         bcopy((char *)softc->ipf_stats, (char *)fiop->f_st,
4322               sizeof(ipf_statistics_t) * 2);
4323         fiop->f_locks[IPL_LOGSTATE] = -1;
4324         fiop->f_locks[IPL_LOGNAT] = -1;
4325         fiop->f_locks[IPL_LOGIPF] = -1;
4326         fiop->f_locks[IPL_LOGAUTH] = -1;
4327
4328         fiop->f_ipf[0][0] = softc->ipf_rules[0][0];
4329         fiop->f_acct[0][0] = softc->ipf_acct[0][0];
4330         fiop->f_ipf[0][1] = softc->ipf_rules[0][1];
4331         fiop->f_acct[0][1] = softc->ipf_acct[0][1];
4332         fiop->f_ipf[1][0] = softc->ipf_rules[1][0];
4333         fiop->f_acct[1][0] = softc->ipf_acct[1][0];
4334         fiop->f_ipf[1][1] = softc->ipf_rules[1][1];
4335         fiop->f_acct[1][1] = softc->ipf_acct[1][1];
4336
4337         fiop->f_ticks = softc->ipf_ticks;
4338         fiop->f_active = softc->ipf_active;
4339         fiop->f_froute[0] = softc->ipf_frouteok[0];
4340         fiop->f_froute[1] = softc->ipf_frouteok[1];
4341         fiop->f_rb_no_mem = softc->ipf_rb_no_mem;
4342         fiop->f_rb_node_max = softc->ipf_rb_node_max;
4343
4344         fiop->f_running = softc->ipf_running;
4345         for (i = 0; i < IPL_LOGSIZE; i++) {
4346                 fiop->f_groups[i][0] = softc->ipf_groups[i][0];
4347                 fiop->f_groups[i][1] = softc->ipf_groups[i][1];
4348         }
4349 #ifdef  IPFILTER_LOG
4350         fiop->f_log_ok = ipf_log_logok(softc, IPL_LOGIPF);
4351         fiop->f_log_fail = ipf_log_failures(softc, IPL_LOGIPF);
4352         fiop->f_logging = 1;
4353 #else
4354         fiop->f_log_ok = 0;
4355         fiop->f_log_fail = 0;
4356         fiop->f_logging = 0;
4357 #endif
4358         fiop->f_defpass = softc->ipf_pass;
4359         fiop->f_features = ipf_features;
4360
4361 #ifdef IPFILTER_COMPAT
4362         sprintf(fiop->f_version, "IP Filter: v%d.%d.%d",
4363                 (rev / 1000000) % 100,
4364                 (rev / 10000) % 100,
4365                 (rev / 100) % 100);
4366 #else
4367         rev = rev;
4368         (void) strncpy(fiop->f_version, ipfilter_version,
4369                        sizeof(fiop->f_version));
4370 #endif
4371 }
4372
4373
4374 #ifdef  USE_INET6
4375 int icmptoicmp6types[ICMP_MAXTYPE+1] = {
4376         ICMP6_ECHO_REPLY,       /* 0: ICMP_ECHOREPLY */
4377         -1,                     /* 1: UNUSED */
4378         -1,                     /* 2: UNUSED */
4379         ICMP6_DST_UNREACH,      /* 3: ICMP_UNREACH */
4380         -1,                     /* 4: ICMP_SOURCEQUENCH */
4381         ND_REDIRECT,            /* 5: ICMP_REDIRECT */
4382         -1,                     /* 6: UNUSED */
4383         -1,                     /* 7: UNUSED */
4384         ICMP6_ECHO_REQUEST,     /* 8: ICMP_ECHO */
4385         -1,                     /* 9: UNUSED */
4386         -1,                     /* 10: UNUSED */
4387         ICMP6_TIME_EXCEEDED,    /* 11: ICMP_TIMXCEED */
4388         ICMP6_PARAM_PROB,       /* 12: ICMP_PARAMPROB */
4389         -1,                     /* 13: ICMP_TSTAMP */
4390         -1,                     /* 14: ICMP_TSTAMPREPLY */
4391         -1,                     /* 15: ICMP_IREQ */
4392         -1,                     /* 16: ICMP_IREQREPLY */
4393         -1,                     /* 17: ICMP_MASKREQ */
4394         -1,                     /* 18: ICMP_MASKREPLY */
4395 };
4396
4397
4398 int     icmptoicmp6unreach[ICMP_MAX_UNREACH] = {
4399         ICMP6_DST_UNREACH_ADDR,         /* 0: ICMP_UNREACH_NET */
4400         ICMP6_DST_UNREACH_ADDR,         /* 1: ICMP_UNREACH_HOST */
4401         -1,                             /* 2: ICMP_UNREACH_PROTOCOL */
4402         ICMP6_DST_UNREACH_NOPORT,       /* 3: ICMP_UNREACH_PORT */
4403         -1,                             /* 4: ICMP_UNREACH_NEEDFRAG */
4404         ICMP6_DST_UNREACH_NOTNEIGHBOR,  /* 5: ICMP_UNREACH_SRCFAIL */
4405         ICMP6_DST_UNREACH_ADDR,         /* 6: ICMP_UNREACH_NET_UNKNOWN */
4406         ICMP6_DST_UNREACH_ADDR,         /* 7: ICMP_UNREACH_HOST_UNKNOWN */
4407         -1,                             /* 8: ICMP_UNREACH_ISOLATED */
4408         ICMP6_DST_UNREACH_ADMIN,        /* 9: ICMP_UNREACH_NET_PROHIB */
4409         ICMP6_DST_UNREACH_ADMIN,        /* 10: ICMP_UNREACH_HOST_PROHIB */
4410         -1,                             /* 11: ICMP_UNREACH_TOSNET */
4411         -1,                             /* 12: ICMP_UNREACH_TOSHOST */
4412         ICMP6_DST_UNREACH_ADMIN,        /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */
4413 };
4414 int     icmpreplytype6[ICMP6_MAXTYPE + 1];
4415 #endif
4416
4417 int     icmpreplytype4[ICMP_MAXTYPE + 1];
4418
4419
4420 /* ------------------------------------------------------------------------ */
4421 /* Function:    ipf_matchicmpqueryreply                                     */
4422 /* Returns:     int - 1 if "icmp" is a valid reply to "ic" else 0.          */
4423 /* Parameters:  v(I)    - IP protocol version (4 or 6)                      */
4424 /*              ic(I)   - ICMP information                                  */
4425 /*              icmp(I) - ICMP packet header                                */
4426 /*              rev(I)  - direction (0 = forward/1 = reverse) of packet     */
4427 /*                                                                          */
4428 /* Check if the ICMP packet defined by the header pointed to by icmp is a   */
4429 /* reply to one as described by what's in ic.  If it is a match, return 1,  */
4430 /* else return 0 for no match.                                              */
4431 /* ------------------------------------------------------------------------ */
4432 int
4433 ipf_matchicmpqueryreply(v, ic, icmp, rev)
4434         int v;
4435         icmpinfo_t *ic;
4436         icmphdr_t *icmp;
4437         int rev;
4438 {
4439         int ictype;
4440
4441         ictype = ic->ici_type;
4442
4443         if (v == 4) {
4444                 /*
4445                  * If we matched its type on the way in, then when going out
4446                  * it will still be the same type.
4447                  */
4448                 if ((!rev && (icmp->icmp_type == ictype)) ||
4449                     (rev && (icmpreplytype4[ictype] == icmp->icmp_type))) {
4450                         if (icmp->icmp_type != ICMP_ECHOREPLY)
4451                                 return 1;
4452                         if (icmp->icmp_id == ic->ici_id)
4453                                 return 1;
4454                 }
4455         }
4456 #ifdef  USE_INET6
4457         else if (v == 6) {
4458                 if ((!rev && (icmp->icmp_type == ictype)) ||
4459                     (rev && (icmpreplytype6[ictype] == icmp->icmp_type))) {
4460                         if (icmp->icmp_type != ICMP6_ECHO_REPLY)
4461                                 return 1;
4462                         if (icmp->icmp_id == ic->ici_id)
4463                                 return 1;
4464                 }
4465         }
4466 #endif
4467         return 0;
4468 }
4469
4470
4471 /* ------------------------------------------------------------------------ */
4472 /* Function:    ipf_rule_compare                                            */
4473 /* Parameters:  fr1(I) - first rule structure to compare                    */
4474 /*              fr2(I) - second rule structure to compare                   */
4475 /* Returns:     int    - 0 == rules are the same, else mismatch             */
4476 /*                                                                          */
4477 /* Compare two rules and return 0 if they match or a number indicating      */
4478 /* which of the individual checks failed.                                   */
4479 /* ------------------------------------------------------------------------ */
4480 static int
4481 ipf_rule_compare(frentry_t *fr1, frentry_t *fr2)
4482 {
4483         if (fr1->fr_cksum != fr2->fr_cksum)
4484                 return 1;
4485         if (fr1->fr_size != fr2->fr_size)
4486                 return 2;
4487         if (fr1->fr_dsize != fr2->fr_dsize)
4488                 return 3;
4489         if (bcmp((char *)&fr1->fr_func, (char *)&fr2->fr_func,
4490                  fr1->fr_size - offsetof(struct frentry, fr_func)) != 0)
4491                 return 4;
4492         if (fr1->fr_data && !fr2->fr_data)
4493                 return 5;
4494         if (!fr1->fr_data && fr2->fr_data)
4495                 return 6;
4496         if (fr1->fr_data) {
4497                 if (bcmp(fr1->fr_caddr, fr2->fr_caddr, fr1->fr_dsize))
4498                         return 7;
4499         }
4500         return 0;
4501 }
4502
4503
4504 /* ------------------------------------------------------------------------ */
4505 /* Function:    frrequest                                                   */
4506 /* Returns:     int - 0 == success, > 0 == errno value                      */
4507 /* Parameters:  unit(I)     - device for which this is for                  */
4508 /*              req(I)      - ioctl command (SIOC*)                         */
4509 /*              data(I)     - pointr to ioctl data                          */
4510 /*              set(I)      - 1 or 0 (filter set)                           */
4511 /*              makecopy(I) - flag indicating whether data points to a rule */
4512 /*                            in kernel space & hence doesn't need copying. */
4513 /*                                                                          */
4514 /* This function handles all the requests which operate on the list of      */
4515 /* filter rules.  This includes adding, deleting, insertion.  It is also    */
4516 /* responsible for creating groups when a "head" rule is loaded.  Interface */
4517 /* names are resolved here and other sanity checks are made on the content  */
4518 /* of the rule structure being loaded.  If a rule has user defined timeouts */
4519 /* then make sure they are created and initialised before exiting.          */
4520 /* ------------------------------------------------------------------------ */
4521 int
4522 frrequest(softc, unit, req, data, set, makecopy)
4523         ipf_main_softc_t *softc;
4524         int unit;
4525         ioctlcmd_t req;
4526         int set, makecopy;
4527         caddr_t data;
4528 {
4529         int error = 0, in, family, addrem, need_free = 0;
4530         frentry_t frd, *fp, *f, **fprev, **ftail;
4531         void *ptr, *uptr, *cptr;
4532         u_int *p, *pp;
4533         frgroup_t *fg;
4534         char *group;
4535
4536         ptr = NULL;
4537         cptr = NULL;
4538         fg = NULL;
4539         fp = &frd;
4540         if (makecopy != 0) {
4541                 bzero(fp, sizeof(frd));
4542                 error = ipf_inobj(softc, data, NULL, fp, IPFOBJ_FRENTRY);
4543                 if (error) {
4544                         return error;
4545                 }
4546                 if ((fp->fr_type & FR_T_BUILTIN) != 0) {
4547                         IPFERROR(6);
4548                         return EINVAL;
4549                 }
4550                 KMALLOCS(f, frentry_t *, fp->fr_size);
4551                 if (f == NULL) {
4552                         IPFERROR(131);
4553                         return ENOMEM;
4554                 }
4555                 bzero(f, fp->fr_size);
4556                 error = ipf_inobjsz(softc, data, f, IPFOBJ_FRENTRY,
4557                                     fp->fr_size);
4558                 if (error) {
4559                         KFREES(f, fp->fr_size);
4560                         return error;
4561                 }
4562
4563                 fp = f;
4564                 f = NULL;
4565                 fp->fr_next = NULL;
4566                 fp->fr_dnext = NULL;
4567                 fp->fr_pnext = NULL;
4568                 fp->fr_pdnext = NULL;
4569                 fp->fr_grp = NULL;
4570                 fp->fr_grphead = NULL;
4571                 fp->fr_icmpgrp = NULL;
4572                 fp->fr_isc = (void *)-1;
4573                 fp->fr_ptr = NULL;
4574                 fp->fr_ref = 0;
4575                 fp->fr_flags |= FR_COPIED;
4576         } else {
4577                 fp = (frentry_t *)data;
4578                 if ((fp->fr_type & FR_T_BUILTIN) == 0) {
4579                         IPFERROR(7);
4580                         return EINVAL;
4581                 }
4582                 fp->fr_flags &= ~FR_COPIED;
4583         }
4584
4585         if (((fp->fr_dsize == 0) && (fp->fr_data != NULL)) ||
4586             ((fp->fr_dsize != 0) && (fp->fr_data == NULL))) {
4587                 IPFERROR(8);
4588                 error = EINVAL;
4589                 goto donenolock;
4590         }
4591
4592         family = fp->fr_family;
4593         uptr = fp->fr_data;
4594
4595         if (req == (ioctlcmd_t)SIOCINAFR || req == (ioctlcmd_t)SIOCINIFR ||
4596             req == (ioctlcmd_t)SIOCADAFR || req == (ioctlcmd_t)SIOCADIFR)
4597                 addrem = 0;
4598         else if (req == (ioctlcmd_t)SIOCRMAFR || req == (ioctlcmd_t)SIOCRMIFR)
4599                 addrem = 1;
4600         else if (req == (ioctlcmd_t)SIOCZRLST)
4601                 addrem = 2;
4602         else {
4603                 IPFERROR(9);
4604                 error = EINVAL;
4605                 goto donenolock;
4606         }
4607
4608         /*
4609          * Only filter rules for IPv4 or IPv6 are accepted.
4610          */
4611         if (family == AF_INET) {
4612                 /*EMPTY*/;
4613 #ifdef  USE_INET6
4614         } else if (family == AF_INET6) {
4615                 /*EMPTY*/;
4616 #endif
4617         } else if (family != 0) {
4618                 IPFERROR(10);
4619                 error = EINVAL;
4620                 goto donenolock;
4621         }
4622
4623         /*
4624          * If the rule is being loaded from user space, i.e. we had to copy it
4625          * into kernel space, then do not trust the function pointer in the
4626          * rule.
4627          */
4628         if ((makecopy == 1) && (fp->fr_func != NULL)) {
4629                 if (ipf_findfunc(fp->fr_func) == NULL) {
4630                         IPFERROR(11);
4631                         error = ESRCH;
4632                         goto donenolock;
4633                 }
4634
4635                 if (addrem == 0) {
4636                         error = ipf_funcinit(softc, fp);
4637                         if (error != 0)
4638                                 goto donenolock;
4639                 }
4640         }
4641         if ((fp->fr_flags & FR_CALLNOW) &&
4642             ((fp->fr_func == NULL) || (fp->fr_func == (ipfunc_t)-1))) {
4643                 IPFERROR(142);
4644                 error = ESRCH;
4645                 goto donenolock;
4646         }
4647         if (((fp->fr_flags & FR_CMDMASK) == FR_CALL) &&
4648             ((fp->fr_func == NULL) || (fp->fr_func == (ipfunc_t)-1))) {
4649                 IPFERROR(143);
4650                 error = ESRCH;
4651                 goto donenolock;
4652         }
4653
4654         ptr = NULL;
4655         cptr = NULL;
4656
4657         if (FR_ISACCOUNT(fp->fr_flags))
4658                 unit = IPL_LOGCOUNT;
4659
4660         /*
4661          * Check that each group name in the rule has a start index that
4662          * is valid.
4663          */
4664         if (fp->fr_icmphead != -1) {
4665                 if ((fp->fr_icmphead < 0) ||
4666                     (fp->fr_icmphead >= fp->fr_namelen)) {
4667                         IPFERROR(136);
4668                         error = EINVAL;
4669                         goto donenolock;
4670                 }
4671                 if (!strcmp(FR_NAME(fp, fr_icmphead), "0"))
4672                         fp->fr_names[fp->fr_icmphead] = '\0';
4673         }
4674
4675         if (fp->fr_grhead != -1) {
4676                 if ((fp->fr_grhead < 0) ||
4677                     (fp->fr_grhead >= fp->fr_namelen)) {
4678                         IPFERROR(137);
4679                         error = EINVAL;
4680                         goto donenolock;
4681                 }
4682                 if (!strcmp(FR_NAME(fp, fr_grhead), "0"))
4683                         fp->fr_names[fp->fr_grhead] = '\0';
4684         }
4685
4686         if (fp->fr_group != -1) {
4687                 if ((fp->fr_group < 0) ||
4688                     (fp->fr_group >= fp->fr_namelen)) {
4689                         IPFERROR(138);
4690                         error = EINVAL;
4691                         goto donenolock;
4692                 }
4693                 if ((req != (int)SIOCZRLST) && (fp->fr_group != -1)) {
4694                         /*
4695                          * Allow loading rules that are in groups to cause
4696                          * them to be created if they don't already exit.
4697                          */
4698                         group = FR_NAME(fp, fr_group);
4699                         if (addrem == 0) {
4700                                 fg = ipf_group_add(softc, group, NULL,
4701                                                    fp->fr_flags, unit, set);
4702                                 fp->fr_grp = fg;
4703                         } else {
4704                                 fg = ipf_findgroup(softc, group, unit,
4705                                                    set, NULL);
4706                                 if (fg == NULL) {
4707                                         IPFERROR(12);
4708                                         error = ESRCH;
4709                                         goto donenolock;
4710                                 }
4711                         }
4712
4713                         if (fg->fg_flags == 0) {
4714                                 fg->fg_flags = fp->fr_flags & FR_INOUT;
4715                         } else if (fg->fg_flags != (fp->fr_flags & FR_INOUT)) {
4716                                 IPFERROR(13);
4717                                 error = ESRCH;
4718                                 goto donenolock;
4719                         }
4720                 }
4721         } else {
4722                 /*
4723                  * If a rule is going to be part of a group then it does
4724                  * not matter whether it is an in or out rule, but if it
4725                  * isn't in a group, then it does...
4726                  */
4727                 if ((fp->fr_flags & (FR_INQUE|FR_OUTQUE)) == 0) {
4728                         IPFERROR(14);
4729                         error = EINVAL;
4730                         goto donenolock;
4731                 }
4732         }
4733         in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
4734
4735         /*
4736          * Work out which rule list this change is being applied to.
4737          */
4738         ftail = NULL;
4739         fprev = NULL;
4740         if (unit == IPL_LOGAUTH) {
4741                 if ((fp->fr_tifs[0].fd_ptr != NULL) ||
4742                     (fp->fr_tifs[1].fd_ptr != NULL) ||
4743                     (fp->fr_dif.fd_ptr != NULL) ||
4744                     (fp->fr_flags & FR_FASTROUTE)) {
4745                         softc->ipf_interror = 145;
4746                         error = EINVAL;
4747                         goto donenolock;
4748                 }
4749                 fprev = ipf_auth_rulehead(softc);
4750         } else {
4751                 if (FR_ISACCOUNT(fp->fr_flags))
4752                         fprev = &softc->ipf_acct[in][set];
4753                 else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) != 0)
4754                         fprev = &softc->ipf_rules[in][set];
4755         }
4756         if (fprev == NULL) {
4757                 IPFERROR(15);
4758                 error = ESRCH;
4759                 goto donenolock;
4760         }
4761
4762         if (fg != NULL)
4763                 fprev = &fg->fg_start;
4764
4765         /*
4766          * Copy in extra data for the rule.
4767          */
4768         if (fp->fr_dsize != 0) {
4769                 if (makecopy != 0) {
4770                         KMALLOCS(ptr, void *, fp->fr_dsize);
4771                         if (ptr == NULL) {
4772                                 IPFERROR(16);
4773                                 error = ENOMEM;
4774                                 goto donenolock;
4775                         }
4776
4777                         /*
4778                          * The bcopy case is for when the data is appended
4779                          * to the rule by ipf_in_compat().
4780                          */
4781                         if (uptr >= (void *)fp &&
4782                             uptr < (void *)((char *)fp + fp->fr_size)) {
4783                                 bcopy(uptr, ptr, fp->fr_dsize);
4784                                 error = 0;
4785                         } else {
4786                                 error = COPYIN(uptr, ptr, fp->fr_dsize);
4787                                 if (error != 0) {
4788                                         IPFERROR(17);
4789                                         error = EFAULT;
4790                                         goto donenolock;
4791                                 }
4792                         }
4793                 } else {
4794                         ptr = uptr;
4795                 }
4796                 fp->fr_data = ptr;
4797         } else {
4798                 fp->fr_data = NULL;
4799         }
4800
4801         /*
4802          * Perform per-rule type sanity checks of their members.
4803          * All code after this needs to be aware that allocated memory
4804          * may need to be free'd before exiting.
4805          */
4806         switch (fp->fr_type & ~FR_T_BUILTIN)
4807         {
4808 #if defined(IPFILTER_BPF)
4809         case FR_T_BPFOPC :
4810                 if (fp->fr_dsize == 0) {
4811                         IPFERROR(19);
4812                         error = EINVAL;
4813                         break;
4814                 }
4815                 if (!bpf_validate(ptr, fp->fr_dsize/sizeof(struct bpf_insn))) {
4816                         IPFERROR(20);
4817                         error = EINVAL;
4818                         break;
4819                 }
4820                 break;
4821 #endif
4822         case FR_T_IPF :
4823                 /*
4824                  * Preparation for error case at the bottom of this function.
4825                  */
4826                 if (fp->fr_datype == FRI_LOOKUP)
4827                         fp->fr_dstptr = NULL;
4828                 if (fp->fr_satype == FRI_LOOKUP)
4829                         fp->fr_srcptr = NULL;
4830
4831                 if (fp->fr_dsize != sizeof(fripf_t)) {
4832                         IPFERROR(21);
4833                         error = EINVAL;
4834                         break;
4835                 }
4836
4837                 /*
4838                  * Allowing a rule with both "keep state" and "with oow" is
4839                  * pointless because adding a state entry to the table will
4840                  * fail with the out of window (oow) flag set.
4841                  */
4842                 if ((fp->fr_flags & FR_KEEPSTATE) && (fp->fr_flx & FI_OOW)) {
4843                         IPFERROR(22);
4844                         error = EINVAL;
4845                         break;
4846                 }
4847
4848                 switch (fp->fr_satype)
4849                 {
4850                 case FRI_BROADCAST :
4851                 case FRI_DYNAMIC :
4852                 case FRI_NETWORK :
4853                 case FRI_NETMASKED :
4854                 case FRI_PEERADDR :
4855                         if (fp->fr_sifpidx < 0) {
4856                                 IPFERROR(23);
4857                                 error = EINVAL;
4858                         }
4859                         break;
4860                 case FRI_LOOKUP :
4861                         fp->fr_srcptr = ipf_findlookup(softc, unit, fp,
4862                                                        &fp->fr_src6,
4863                                                        &fp->fr_smsk6);
4864                         if (fp->fr_srcfunc == NULL) {
4865                                 IPFERROR(132);
4866                                 error = ESRCH;
4867                                 break;
4868                         }
4869                         break;
4870                 case FRI_NORMAL :
4871                         break;
4872                 default :
4873                         IPFERROR(133);
4874                         error = EINVAL;
4875                         break;
4876                 }
4877                 if (error != 0)
4878                         break;
4879
4880                 switch (fp->fr_datype)
4881                 {
4882                 case FRI_BROADCAST :
4883                 case FRI_DYNAMIC :
4884                 case FRI_NETWORK :
4885                 case FRI_NETMASKED :
4886                 case FRI_PEERADDR :
4887                         if (fp->fr_difpidx < 0) {
4888                                 IPFERROR(24);
4889                                 error = EINVAL;
4890                         }
4891                         break;
4892                 case FRI_LOOKUP :
4893                         fp->fr_dstptr = ipf_findlookup(softc, unit, fp,
4894                                                        &fp->fr_dst6,
4895                                                        &fp->fr_dmsk6);
4896                         if (fp->fr_dstfunc == NULL) {
4897                                 IPFERROR(134);
4898                                 error = ESRCH;
4899                         }
4900                         break;
4901                 case FRI_NORMAL :
4902                         break;
4903                 default :
4904                         IPFERROR(135);
4905                         error = EINVAL;
4906                 }
4907                 break;
4908
4909         case FR_T_NONE :
4910         case FR_T_CALLFUNC :
4911         case FR_T_COMPIPF :
4912                 break;
4913
4914         case FR_T_IPFEXPR :
4915                 if (ipf_matcharray_verify(fp->fr_data, fp->fr_dsize) == -1) {
4916                         IPFERROR(25);
4917                         error = EINVAL;
4918                 }
4919                 break;
4920
4921         default :
4922                 IPFERROR(26);
4923                 error = EINVAL;
4924                 break;
4925         }
4926         if (error != 0)
4927                 goto donenolock;
4928
4929         if (fp->fr_tif.fd_name != -1) {
4930                 if ((fp->fr_tif.fd_name < 0) ||
4931                     (fp->fr_tif.fd_name >= fp->fr_namelen)) {
4932                         IPFERROR(139);
4933                         error = EINVAL;
4934                         goto donenolock;
4935                 }
4936         }
4937
4938         if (fp->fr_dif.fd_name != -1) {
4939                 if ((fp->fr_dif.fd_name < 0) ||
4940                     (fp->fr_dif.fd_name >= fp->fr_namelen)) {
4941                         IPFERROR(140);
4942                         error = EINVAL;
4943                         goto donenolock;
4944                 }
4945         }
4946
4947         if (fp->fr_rif.fd_name != -1) {
4948                 if ((fp->fr_rif.fd_name < 0) ||
4949                     (fp->fr_rif.fd_name >= fp->fr_namelen)) {
4950                         IPFERROR(141);
4951                         error = EINVAL;
4952                         goto donenolock;
4953                 }
4954         }
4955
4956         /*
4957          * Lookup all the interface names that are part of the rule.
4958          */
4959         error = ipf_synclist(softc, fp, NULL);
4960         if (error != 0)
4961                 goto donenolock;
4962         fp->fr_statecnt = 0;
4963         if (fp->fr_srctrack.ht_max_nodes != 0)
4964                 ipf_rb_ht_init(&fp->fr_srctrack);
4965
4966         /*
4967          * Look for an existing matching filter rule, but don't include the
4968          * next or interface pointer in the comparison (fr_next, fr_ifa).
4969          * This elminates rules which are indentical being loaded.  Checksum
4970          * the constant part of the filter rule to make comparisons quicker
4971          * (this meaning no pointers are included).
4972          */
4973         for (fp->fr_cksum = 0, p = (u_int *)&fp->fr_func, pp = &fp->fr_cksum;
4974              p < pp; p++)
4975                 fp->fr_cksum += *p;
4976         pp = (u_int *)(fp->fr_caddr + fp->fr_dsize);
4977         for (p = (u_int *)fp->fr_data; p < pp; p++)
4978                 fp->fr_cksum += *p;
4979
4980         WRITE_ENTER(&softc->ipf_mutex);
4981
4982         /*
4983          * Now that the filter rule lists are locked, we can walk the
4984          * chain of them without fear.
4985          */
4986         ftail = fprev;
4987         for (f = *ftail; (f = *ftail) != NULL; ftail = &f->fr_next) {
4988                 if (fp->fr_collect <= f->fr_collect) {
4989                         ftail = fprev;
4990                         f = NULL;
4991                         break;
4992                 }
4993                 fprev = ftail;
4994         }
4995
4996         for (; (f = *ftail) != NULL; ftail = &f->fr_next) {
4997                 if (ipf_rule_compare(fp, f) == 0)
4998                         break;
4999         }
5000
5001         /*
5002          * If zero'ing statistics, copy current to caller and zero.
5003          */
5004         if (addrem == 2) {
5005                 if (f == NULL) {
5006                         IPFERROR(27);
5007                         error = ESRCH;
5008                 } else {
5009                         /*
5010                          * Copy and reduce lock because of impending copyout.
5011                          * Well we should, but if we do then the atomicity of
5012                          * this call and the correctness of fr_hits and
5013                          * fr_bytes cannot be guaranteed.  As it is, this code
5014                          * only resets them to 0 if they are successfully
5015                          * copied out into user space.
5016                          */
5017                         bcopy((char *)f, (char *)fp, f->fr_size);
5018                         /* MUTEX_DOWNGRADE(&softc->ipf_mutex); */
5019
5020                         /*
5021                          * When we copy this rule back out, set the data
5022                          * pointer to be what it was in user space.
5023                          */
5024                         fp->fr_data = uptr;
5025                         error = ipf_outobj(softc, data, fp, IPFOBJ_FRENTRY);
5026
5027                         if (error == 0) {
5028                                 if ((f->fr_dsize != 0) && (uptr != NULL))
5029                                         error = COPYOUT(f->fr_data, uptr,
5030                                                         f->fr_dsize);
5031                                         if (error != 0) {
5032                                                 IPFERROR(28);
5033                                                 error = EFAULT;
5034                                         }
5035                                 if (error == 0) {
5036                                         f->fr_hits = 0;
5037                                         f->fr_bytes = 0;
5038                                 }
5039                         }
5040                 }
5041
5042                 if (makecopy != 0) {
5043                         if (ptr != NULL) {
5044                                 KFREES(ptr, fp->fr_dsize);
5045                         }
5046                         KFREES(fp, fp->fr_size);
5047                 }
5048                 RWLOCK_EXIT(&softc->ipf_mutex);
5049                 return error;
5050         }
5051
5052         if (!f) {
5053                 /*
5054                  * At the end of this, ftail must point to the place where the
5055                  * new rule is to be saved/inserted/added.
5056                  * For SIOCAD*FR, this should be the last rule in the group of
5057                  * rules that have equal fr_collect fields.
5058                  * For SIOCIN*FR, ...
5059                  */
5060                 if (req == (ioctlcmd_t)SIOCADAFR ||
5061                     req == (ioctlcmd_t)SIOCADIFR) {
5062
5063                         for (ftail = fprev; (f = *ftail) != NULL; ) {
5064                                 if (f->fr_collect > fp->fr_collect)
5065                                         break;
5066                                 ftail = &f->fr_next;
5067                                 fprev = ftail;
5068                         }
5069                         ftail = fprev;
5070                         f = NULL;
5071                         ptr = NULL;
5072                 } else if (req == (ioctlcmd_t)SIOCINAFR ||
5073                            req == (ioctlcmd_t)SIOCINIFR) {
5074                         while ((f = *fprev) != NULL) {
5075                                 if (f->fr_collect >= fp->fr_collect)
5076                                         break;
5077                                 fprev = &f->fr_next;
5078                         }
5079                         ftail = fprev;
5080                         if (fp->fr_hits != 0) {
5081                                 while (fp->fr_hits && (f = *ftail)) {
5082                                         if (f->fr_collect != fp->fr_collect)
5083                                                 break;
5084                                         fprev = ftail;
5085                                         ftail = &f->fr_next;
5086                                         fp->fr_hits--;
5087                                 }
5088                         }
5089                         f = NULL;
5090                         ptr = NULL;
5091                 }
5092         }
5093
5094         /*
5095          * Request to remove a rule.
5096          */
5097         if (addrem == 1) {
5098                 if (!f) {
5099                         IPFERROR(29);
5100                         error = ESRCH;
5101                 } else {
5102                         /*
5103                          * Do not allow activity from user space to interfere
5104                          * with rules not loaded that way.
5105                          */
5106                         if ((makecopy == 1) && !(f->fr_flags & FR_COPIED)) {
5107                                 IPFERROR(30);
5108                                 error = EPERM;
5109                                 goto done;
5110                         }
5111
5112                         /*
5113                          * Return EBUSY if the rule is being reference by
5114                          * something else (eg state information.)
5115                          */
5116                         if (f->fr_ref > 1) {
5117                                 IPFERROR(31);
5118                                 error = EBUSY;
5119                                 goto done;
5120                         }
5121 #ifdef  IPFILTER_SCAN
5122                         if (f->fr_isctag != -1 &&
5123                             (f->fr_isc != (struct ipscan *)-1))
5124                                 ipf_scan_detachfr(f);
5125 #endif
5126
5127                         if (unit == IPL_LOGAUTH) {
5128                                 error = ipf_auth_precmd(softc, req, f, ftail);
5129                                 goto done;
5130                         }
5131
5132                         ipf_rule_delete(softc, f, unit, set);
5133
5134                         need_free = makecopy;
5135                 }
5136         } else {
5137                 /*
5138                  * Not removing, so we must be adding/inserting a rule.
5139                  */
5140                 if (f != NULL) {
5141                         IPFERROR(32);
5142                         error = EEXIST;
5143                         goto done;
5144                 }
5145                 if (unit == IPL_LOGAUTH) {
5146                         error = ipf_auth_precmd(softc, req, fp, ftail);
5147                         goto done;
5148                 }
5149
5150                 MUTEX_NUKE(&fp->fr_lock);
5151                 MUTEX_INIT(&fp->fr_lock, "filter rule lock");
5152                 if (fp->fr_die != 0)
5153                         ipf_rule_expire_insert(softc, fp, set);
5154
5155                 fp->fr_hits = 0;
5156                 if (makecopy != 0)
5157                         fp->fr_ref = 1;
5158                 fp->fr_pnext = ftail;
5159                 fp->fr_next = *ftail;
5160                 if (fp->fr_next != NULL)
5161                         fp->fr_next->fr_pnext = &fp->fr_next;
5162                 *ftail = fp;
5163                 if (addrem == 0)
5164                         ipf_fixskip(ftail, fp, 1);
5165
5166                 fp->fr_icmpgrp = NULL;
5167                 if (fp->fr_icmphead != -1) {
5168                         group = FR_NAME(fp, fr_icmphead);
5169                         fg = ipf_group_add(softc, group, fp, 0, unit, set);
5170                         fp->fr_icmpgrp = fg;
5171                 }
5172
5173                 fp->fr_grphead = NULL;
5174                 if (fp->fr_grhead != -1) {
5175                         group = FR_NAME(fp, fr_grhead);
5176                         fg = ipf_group_add(softc, group, fp, fp->fr_flags,
5177                                            unit, set);
5178                         fp->fr_grphead = fg;
5179                 }
5180         }
5181 done:
5182         RWLOCK_EXIT(&softc->ipf_mutex);
5183 donenolock:
5184         if (need_free || (error != 0)) {
5185                 if ((fp->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) {
5186                         if ((fp->fr_satype == FRI_LOOKUP) &&
5187                             (fp->fr_srcptr != NULL))
5188                                 ipf_lookup_deref(softc, fp->fr_srctype,
5189                                                  fp->fr_srcptr);
5190                         if ((fp->fr_datype == FRI_LOOKUP) &&
5191                             (fp->fr_dstptr != NULL))
5192                                 ipf_lookup_deref(softc, fp->fr_dsttype,
5193                                                  fp->fr_dstptr);
5194                 }
5195                 if (fp->fr_grp != NULL) {
5196                         WRITE_ENTER(&softc->ipf_mutex);
5197                         ipf_group_del(softc, fp->fr_grp, fp);
5198                         RWLOCK_EXIT(&softc->ipf_mutex);
5199                 }
5200                 if ((ptr != NULL) && (makecopy != 0)) {
5201                         KFREES(ptr, fp->fr_dsize);
5202                 }
5203                 KFREES(fp, fp->fr_size);
5204         }
5205         return (error);
5206 }
5207
5208
5209 /* ------------------------------------------------------------------------ */
5210 /* Function:   ipf_rule_delete                                              */
5211 /* Returns:    Nil                                                          */
5212 /* Parameters: softc(I) - pointer to soft context main structure            */
5213 /*             f(I)     - pointer to the rule being deleted                 */
5214 /*             ftail(I) - pointer to the pointer to f                       */
5215 /*             unit(I)  - device for which this is for                      */
5216 /*             set(I)   - 1 or 0 (filter set)                               */
5217 /*                                                                          */
5218 /* This function attempts to do what it can to delete a filter rule: remove */
5219 /* it from any linked lists and remove any groups it is responsible for.    */
5220 /* But in the end, removing a rule can only drop the reference count - we   */
5221 /* must use that as the guide for whether or not it can be freed.           */
5222 /* ------------------------------------------------------------------------ */
5223 static void
5224 ipf_rule_delete(softc, f, unit, set)
5225         ipf_main_softc_t *softc;
5226         frentry_t *f;
5227         int unit, set;
5228 {
5229
5230         /*
5231          * If fr_pdnext is set, then the rule is on the expire list, so
5232          * remove it from there.
5233          */
5234         if (f->fr_pdnext != NULL) {
5235                 *f->fr_pdnext = f->fr_dnext;
5236                 if (f->fr_dnext != NULL)
5237                         f->fr_dnext->fr_pdnext = f->fr_pdnext;
5238                 f->fr_pdnext = NULL;
5239                 f->fr_dnext = NULL;
5240         }
5241
5242         ipf_fixskip(f->fr_pnext, f, -1);
5243         if (f->fr_pnext != NULL)
5244                 *f->fr_pnext = f->fr_next;
5245         if (f->fr_next != NULL)
5246                 f->fr_next->fr_pnext = f->fr_pnext;
5247         f->fr_pnext = NULL;
5248         f->fr_next = NULL;
5249
5250         (void) ipf_derefrule(softc, &f);
5251 }
5252
5253 /* ------------------------------------------------------------------------ */
5254 /* Function:   ipf_rule_expire_insert                                       */
5255 /* Returns:    Nil                                                          */
5256 /* Parameters: softc(I) - pointer to soft context main structure            */
5257 /*             f(I)     - pointer to rule to be added to expire list        */
5258 /*             set(I)   - 1 or 0 (filter set)                               */
5259 /*                                                                          */
5260 /* If the new rule has a given expiration time, insert it into the list of  */
5261 /* expiring rules with the ones to be removed first added to the front of   */
5262 /* the list. The insertion is O(n) but it is kept sorted for quick scans at */
5263 /* expiration interval checks.                                              */
5264 /* ------------------------------------------------------------------------ */
5265 static void
5266 ipf_rule_expire_insert(softc, f, set)
5267         ipf_main_softc_t *softc;
5268         frentry_t *f;
5269         int set;
5270 {
5271         frentry_t *fr;
5272
5273         /*
5274          */
5275
5276         f->fr_die = softc->ipf_ticks + IPF_TTLVAL(f->fr_die);
5277         for (fr = softc->ipf_rule_explist[set]; fr != NULL;
5278              fr = fr->fr_dnext) {
5279                 if (f->fr_die < fr->fr_die)
5280                         break;
5281                 if (fr->fr_dnext == NULL) {
5282                         /*
5283                          * We've got to the last rule and everything
5284                          * wanted to be expired before this new node,
5285                          * so we have to tack it on the end...
5286                          */
5287                         fr->fr_dnext = f;
5288                         f->fr_pdnext = &fr->fr_dnext;
5289                         fr = NULL;
5290                         break;
5291                 }
5292         }
5293
5294         if (softc->ipf_rule_explist[set] == NULL) {
5295                 softc->ipf_rule_explist[set] = f;
5296                 f->fr_pdnext = &softc->ipf_rule_explist[set];
5297         } else if (fr != NULL) {
5298                 f->fr_dnext = fr;
5299                 f->fr_pdnext = fr->fr_pdnext;
5300                 fr->fr_pdnext = &f->fr_dnext;
5301         }
5302 }
5303
5304
5305 /* ------------------------------------------------------------------------ */
5306 /* Function:   ipf_findlookup                                               */
5307 /* Returns:    NULL = failure, else success                                 */
5308 /* Parameters: softc(I) - pointer to soft context main structure            */
5309 /*             unit(I)  - ipf device we want to find match for              */
5310 /*             fp(I)    - rule for which lookup is for                      */
5311 /*             addrp(I) - pointer to lookup information in address struct   */
5312 /*             maskp(O) - pointer to lookup information for storage         */
5313 /*                                                                          */
5314 /* When using pools and hash tables to store addresses for matching in      */
5315 /* rules, it is necessary to resolve both the object referred to by the     */
5316 /* name or address (and return that pointer) and also provide the means by  */
5317 /* which to determine if an address belongs to that object to make the      */
5318 /* packet matching quicker.                                                 */
5319 /* ------------------------------------------------------------------------ */
5320 static void *
5321 ipf_findlookup(softc, unit, fr, addrp, maskp)
5322         ipf_main_softc_t *softc;
5323         int unit;
5324         frentry_t *fr;
5325         i6addr_t *addrp, *maskp;
5326 {
5327         void *ptr = NULL;
5328
5329         switch (addrp->iplookupsubtype)
5330         {
5331         case 0 :
5332                 ptr = ipf_lookup_res_num(softc, unit, addrp->iplookuptype,
5333                                          addrp->iplookupnum,
5334                                          &maskp->iplookupfunc);
5335                 break;
5336         case 1 :
5337                 if (addrp->iplookupname < 0)
5338                         break;
5339                 if (addrp->iplookupname >= fr->fr_namelen)
5340                         break;
5341                 ptr = ipf_lookup_res_name(softc, unit, addrp->iplookuptype,
5342                                           fr->fr_names + addrp->iplookupname,
5343                                           &maskp->iplookupfunc);
5344                 break;
5345         default :
5346                 break;
5347         }
5348
5349         return ptr;
5350 }
5351
5352
5353 /* ------------------------------------------------------------------------ */
5354 /* Function:    ipf_funcinit                                                */
5355 /* Returns:     int - 0 == success, else ESRCH: cannot resolve rule details */
5356 /* Parameters:  softc(I) - pointer to soft context main structure           */
5357 /*              fr(I)    - pointer to filter rule                           */
5358 /*                                                                          */
5359 /* If a rule is a call rule, then check if the function it points to needs  */
5360 /* an init function to be called now the rule has been loaded.              */
5361 /* ------------------------------------------------------------------------ */
5362 static int
5363 ipf_funcinit(softc, fr)
5364         ipf_main_softc_t *softc;
5365         frentry_t *fr;
5366 {
5367         ipfunc_resolve_t *ft;
5368         int err;
5369
5370         IPFERROR(34);
5371         err = ESRCH;
5372
5373         for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5374                 if (ft->ipfu_addr == fr->fr_func) {
5375                         err = 0;
5376                         if (ft->ipfu_init != NULL)
5377                                 err = (*ft->ipfu_init)(softc, fr);
5378                         break;
5379                 }
5380         return err;
5381 }
5382
5383
5384 /* ------------------------------------------------------------------------ */
5385 /* Function:    ipf_funcfini                                                */
5386 /* Returns:     Nil                                                         */
5387 /* Parameters:  softc(I) - pointer to soft context main structure           */
5388 /*              fr(I)    - pointer to filter rule                           */
5389 /*                                                                          */
5390 /* For a given filter rule, call the matching "fini" function if the rule   */
5391 /* is using a known function that would have resulted in the "init" being   */
5392 /* called for ealier.                                                       */
5393 /* ------------------------------------------------------------------------ */
5394 static void
5395 ipf_funcfini(softc, fr)
5396         ipf_main_softc_t *softc;
5397         frentry_t *fr;
5398 {
5399         ipfunc_resolve_t *ft;
5400
5401         for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5402                 if (ft->ipfu_addr == fr->fr_func) {
5403                         if (ft->ipfu_fini != NULL)
5404                                 (void) (*ft->ipfu_fini)(softc, fr);
5405                         break;
5406                 }
5407 }
5408
5409
5410 /* ------------------------------------------------------------------------ */
5411 /* Function:    ipf_findfunc                                                */
5412 /* Returns:     ipfunc_t - pointer to function if found, else NULL          */
5413 /* Parameters:  funcptr(I) - function pointer to lookup                     */
5414 /*                                                                          */
5415 /* Look for a function in the table of known functions.                     */
5416 /* ------------------------------------------------------------------------ */
5417 static ipfunc_t
5418 ipf_findfunc(funcptr)
5419         ipfunc_t funcptr;
5420 {
5421         ipfunc_resolve_t *ft;
5422
5423         for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5424                 if (ft->ipfu_addr == funcptr)
5425                         return funcptr;
5426         return NULL;
5427 }
5428
5429
5430 /* ------------------------------------------------------------------------ */
5431 /* Function:    ipf_resolvefunc                                             */
5432 /* Returns:     int - 0 == success, else error                              */
5433 /* Parameters:  data(IO) - ioctl data pointer to ipfunc_resolve_t struct    */
5434 /*                                                                          */
5435 /* Copy in a ipfunc_resolve_t structure and then fill in the missing field. */
5436 /* This will either be the function name (if the pointer is set) or the     */
5437 /* function pointer if the name is set.  When found, fill in the other one  */
5438 /* so that the entire, complete, structure can be copied back to user space.*/
5439 /* ------------------------------------------------------------------------ */
5440 int
5441 ipf_resolvefunc(softc, data)
5442         ipf_main_softc_t *softc;
5443         void *data;
5444 {
5445         ipfunc_resolve_t res, *ft;
5446         int error;
5447
5448         error = BCOPYIN(data, &res, sizeof(res));
5449         if (error != 0) {
5450                 IPFERROR(123);
5451                 return EFAULT;
5452         }
5453
5454         if (res.ipfu_addr == NULL && res.ipfu_name[0] != '\0') {
5455                 for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5456                         if (strncmp(res.ipfu_name, ft->ipfu_name,
5457                                     sizeof(res.ipfu_name)) == 0) {
5458                                 res.ipfu_addr = ft->ipfu_addr;
5459                                 res.ipfu_init = ft->ipfu_init;
5460                                 if (COPYOUT(&res, data, sizeof(res)) != 0) {
5461                                         IPFERROR(35);
5462                                         return EFAULT;
5463                                 }
5464                                 return 0;
5465                         }
5466         }
5467         if (res.ipfu_addr != NULL && res.ipfu_name[0] == '\0') {
5468                 for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5469                         if (ft->ipfu_addr == res.ipfu_addr) {
5470                                 (void) strncpy(res.ipfu_name, ft->ipfu_name,
5471                                                sizeof(res.ipfu_name));
5472                                 res.ipfu_init = ft->ipfu_init;
5473                                 if (COPYOUT(&res, data, sizeof(res)) != 0) {
5474                                         IPFERROR(36);
5475                                         return EFAULT;
5476                                 }
5477                                 return 0;
5478                         }
5479         }
5480         IPFERROR(37);
5481         return ESRCH;
5482 }
5483
5484
5485 #if !defined(_KERNEL) || (!defined(__NetBSD__) && !defined(__OpenBSD__) && \
5486      !defined(__FreeBSD__)) || \
5487     FREEBSD_LT_REV(501000) || NETBSD_LT_REV(105000000) || \
5488     OPENBSD_LT_REV(200006)
5489 /*
5490  * From: NetBSD
5491  * ppsratecheck(): packets (or events) per second limitation.
5492  */
5493 int
5494 ppsratecheck(lasttime, curpps, maxpps)
5495         struct timeval *lasttime;
5496         int *curpps;
5497         int maxpps;     /* maximum pps allowed */
5498 {
5499         struct timeval tv, delta;
5500         int rv;
5501
5502         GETKTIME(&tv);
5503
5504         delta.tv_sec = tv.tv_sec - lasttime->tv_sec;
5505         delta.tv_usec = tv.tv_usec - lasttime->tv_usec;
5506         if (delta.tv_usec < 0) {
5507                 delta.tv_sec--;
5508                 delta.tv_usec += 1000000;
5509         }
5510
5511         /*
5512          * check for 0,0 is so that the message will be seen at least once.
5513          * if more than one second have passed since the last update of
5514          * lasttime, reset the counter.
5515          *
5516          * we do increment *curpps even in *curpps < maxpps case, as some may
5517          * try to use *curpps for stat purposes as well.
5518          */
5519         if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
5520             delta.tv_sec >= 1) {
5521                 *lasttime = tv;
5522                 *curpps = 0;
5523                 rv = 1;
5524         } else if (maxpps < 0)
5525                 rv = 1;
5526         else if (*curpps < maxpps)
5527                 rv = 1;
5528         else
5529                 rv = 0;
5530         *curpps = *curpps + 1;
5531
5532         return (rv);
5533 }
5534 #endif
5535
5536
5537 /* ------------------------------------------------------------------------ */
5538 /* Function:    ipf_derefrule                                               */
5539 /* Returns:     int   - 0 == rule freed up, else rule not freed             */
5540 /* Parameters:  fr(I) - pointer to filter rule                              */
5541 /*                                                                          */
5542 /* Decrement the reference counter to a rule by one.  If it reaches zero,   */
5543 /* free it and any associated storage space being used by it.               */
5544 /* ------------------------------------------------------------------------ */
5545 int
5546 ipf_derefrule(softc, frp)
5547         ipf_main_softc_t *softc;
5548         frentry_t **frp;
5549 {
5550         frentry_t *fr;
5551         frdest_t *fdp;
5552
5553         fr = *frp;
5554         *frp = NULL;
5555
5556         MUTEX_ENTER(&fr->fr_lock);
5557         fr->fr_ref--;
5558         if (fr->fr_ref == 0) {
5559                 MUTEX_EXIT(&fr->fr_lock);
5560                 MUTEX_DESTROY(&fr->fr_lock);
5561
5562                 ipf_funcfini(softc, fr);
5563
5564                 fdp = &fr->fr_tif;
5565                 if (fdp->fd_type == FRD_DSTLIST)
5566                         ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5567
5568                 fdp = &fr->fr_rif;
5569                 if (fdp->fd_type == FRD_DSTLIST)
5570                         ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5571
5572                 fdp = &fr->fr_dif;
5573                 if (fdp->fd_type == FRD_DSTLIST)
5574                         ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5575
5576                 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF &&
5577                     fr->fr_satype == FRI_LOOKUP)
5578                         ipf_lookup_deref(softc, fr->fr_srctype, fr->fr_srcptr);
5579                 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF &&
5580                     fr->fr_datype == FRI_LOOKUP)
5581                         ipf_lookup_deref(softc, fr->fr_dsttype, fr->fr_dstptr);
5582
5583                 if (fr->fr_grp != NULL)
5584                         ipf_group_del(softc, fr->fr_grp, fr);
5585
5586                 if (fr->fr_grphead != NULL)
5587                         ipf_group_del(softc, fr->fr_grphead, fr);
5588
5589                 if (fr->fr_icmpgrp != NULL)
5590                         ipf_group_del(softc, fr->fr_icmpgrp, fr);
5591
5592                 if ((fr->fr_flags & FR_COPIED) != 0) {
5593                         if (fr->fr_dsize) {
5594                                 KFREES(fr->fr_data, fr->fr_dsize);
5595                         }
5596                         KFREES(fr, fr->fr_size);
5597                         return 0;
5598                 }
5599                 return 1;
5600         } else {
5601                 MUTEX_EXIT(&fr->fr_lock);
5602         }
5603         return -1;
5604 }
5605
5606
5607 /* ------------------------------------------------------------------------ */
5608 /* Function:    ipf_grpmapinit                                              */
5609 /* Returns:     int - 0 == success, else ESRCH because table entry not found*/
5610 /* Parameters:  fr(I) - pointer to rule to find hash table for              */
5611 /*                                                                          */
5612 /* Looks for group hash table fr_arg and stores a pointer to it in fr_ptr.  */
5613 /* fr_ptr is later used by ipf_srcgrpmap and ipf_dstgrpmap.                 */
5614 /* ------------------------------------------------------------------------ */
5615 static int
5616 ipf_grpmapinit(softc, fr)
5617         ipf_main_softc_t *softc;
5618         frentry_t *fr;
5619 {
5620         char name[FR_GROUPLEN];
5621         iphtable_t *iph;
5622
5623 #if defined(SNPRINTF) && defined(_KERNEL)
5624         SNPRINTF(name, sizeof(name), "%d", fr->fr_arg);
5625 #else
5626         (void) sprintf(name, "%d", fr->fr_arg);
5627 #endif
5628         iph = ipf_lookup_find_htable(softc, IPL_LOGIPF, name);
5629         if (iph == NULL) {
5630                 IPFERROR(38);
5631                 return ESRCH;
5632         }
5633         if ((iph->iph_flags & FR_INOUT) != (fr->fr_flags & FR_INOUT)) {
5634                 IPFERROR(39);
5635                 return ESRCH;
5636         }
5637         iph->iph_ref++;
5638         fr->fr_ptr = iph;
5639         return 0;
5640 }
5641
5642
5643 /* ------------------------------------------------------------------------ */
5644 /* Function:    ipf_grpmapfini                                              */
5645 /* Returns:     int - 0 == success, else ESRCH because table entry not found*/
5646 /* Parameters:  softc(I) - pointer to soft context main structure           */
5647 /*              fr(I)    - pointer to rule to release hash table for        */
5648 /*                                                                          */
5649 /* For rules that have had ipf_grpmapinit called, ipf_lookup_deref needs to */
5650 /* be called to undo what ipf_grpmapinit caused to be done.                 */
5651 /* ------------------------------------------------------------------------ */
5652 static int
5653 ipf_grpmapfini(softc, fr)
5654         ipf_main_softc_t *softc;
5655         frentry_t *fr;
5656 {
5657         iphtable_t *iph;
5658         iph = fr->fr_ptr;
5659         if (iph != NULL)
5660                 ipf_lookup_deref(softc, IPLT_HASH, iph);
5661         return 0;
5662 }
5663
5664
5665 /* ------------------------------------------------------------------------ */
5666 /* Function:    ipf_srcgrpmap                                               */
5667 /* Returns:     frentry_t * - pointer to "new last matching" rule or NULL   */
5668 /* Parameters:  fin(I)    - pointer to packet information                   */
5669 /*              passp(IO) - pointer to current/new filter decision (unused) */
5670 /*                                                                          */
5671 /* Look for a rule group head in a hash table, using the source address as  */
5672 /* the key, and descend into that group and continue matching rules against */
5673 /* the packet.                                                              */
5674 /* ------------------------------------------------------------------------ */
5675 frentry_t *
5676 ipf_srcgrpmap(fin, passp)
5677         fr_info_t *fin;
5678         u_32_t *passp;
5679 {
5680         frgroup_t *fg;
5681         void *rval;
5682
5683         rval = ipf_iphmfindgroup(fin->fin_main_soft, fin->fin_fr->fr_ptr,
5684                                  &fin->fin_src);
5685         if (rval == NULL)
5686                 return NULL;
5687
5688         fg = rval;
5689         fin->fin_fr = fg->fg_start;
5690         (void) ipf_scanlist(fin, *passp);
5691         return fin->fin_fr;
5692 }
5693
5694
5695 /* ------------------------------------------------------------------------ */
5696 /* Function:    ipf_dstgrpmap                                               */
5697 /* Returns:     frentry_t * - pointer to "new last matching" rule or NULL   */
5698 /* Parameters:  fin(I)    - pointer to packet information                   */
5699 /*              passp(IO) - pointer to current/new filter decision (unused) */
5700 /*                                                                          */
5701 /* Look for a rule group head in a hash table, using the destination        */
5702 /* address as the key, and descend into that group and continue matching    */
5703 /* rules against  the packet.                                               */
5704 /* ------------------------------------------------------------------------ */
5705 frentry_t *
5706 ipf_dstgrpmap(fin, passp)
5707         fr_info_t *fin;
5708         u_32_t *passp;
5709 {
5710         frgroup_t *fg;
5711         void *rval;
5712
5713         rval = ipf_iphmfindgroup(fin->fin_main_soft, fin->fin_fr->fr_ptr,
5714                                  &fin->fin_dst);
5715         if (rval == NULL)
5716                 return NULL;
5717
5718         fg = rval;
5719         fin->fin_fr = fg->fg_start;
5720         (void) ipf_scanlist(fin, *passp);
5721         return fin->fin_fr;
5722 }
5723
5724 /*
5725  * Queue functions
5726  * ===============
5727  * These functions manage objects on queues for efficient timeouts.  There
5728  * are a number of system defined queues as well as user defined timeouts.
5729  * It is expected that a lock is held in the domain in which the queue
5730  * belongs (i.e. either state or NAT) when calling any of these functions
5731  * that prevents ipf_freetimeoutqueue() from being called at the same time
5732  * as any other.
5733  */
5734
5735
5736 /* ------------------------------------------------------------------------ */
5737 /* Function:    ipf_addtimeoutqueue                                         */
5738 /* Returns:     struct ifqtq * - NULL if malloc fails, else pointer to      */
5739 /*                               timeout queue with given interval.         */
5740 /* Parameters:  parent(I)  - pointer to pointer to parent node of this list */
5741 /*                           of interface queues.                           */
5742 /*              seconds(I) - timeout value in seconds for this queue.       */
5743 /*                                                                          */
5744 /* This routine first looks for a timeout queue that matches the interval   */
5745 /* being requested.  If it finds one, increments the reference counter and  */
5746 /* returns a pointer to it.  If none are found, it allocates a new one and  */
5747 /* inserts it at the top of the list.                                       */
5748 /*                                                                          */
5749 /* Locking.                                                                 */
5750 /* It is assumed that the caller of this function has an appropriate lock   */
5751 /* held (exclusively) in the domain that encompases 'parent'.               */
5752 /* ------------------------------------------------------------------------ */
5753 ipftq_t *
5754 ipf_addtimeoutqueue(softc, parent, seconds)
5755         ipf_main_softc_t *softc;
5756         ipftq_t **parent;
5757         u_int seconds;
5758 {
5759         ipftq_t *ifq;
5760         u_int period;
5761
5762         period = seconds * IPF_HZ_DIVIDE;
5763
5764         MUTEX_ENTER(&softc->ipf_timeoutlock);
5765         for (ifq = *parent; ifq != NULL; ifq = ifq->ifq_next) {
5766                 if (ifq->ifq_ttl == period) {
5767                         /*
5768                          * Reset the delete flag, if set, so the structure
5769                          * gets reused rather than freed and reallocated.
5770                          */
5771                         MUTEX_ENTER(&ifq->ifq_lock);
5772                         ifq->ifq_flags &= ~IFQF_DELETE;
5773                         ifq->ifq_ref++;
5774                         MUTEX_EXIT(&ifq->ifq_lock);
5775                         MUTEX_EXIT(&softc->ipf_timeoutlock);
5776
5777                         return ifq;
5778                 }
5779         }
5780
5781         KMALLOC(ifq, ipftq_t *);
5782         if (ifq != NULL) {
5783                 MUTEX_NUKE(&ifq->ifq_lock);
5784                 IPFTQ_INIT(ifq, period, "ipftq mutex");
5785                 ifq->ifq_next = *parent;
5786                 ifq->ifq_pnext = parent;
5787                 ifq->ifq_flags = IFQF_USER;
5788                 ifq->ifq_ref++;
5789                 *parent = ifq;
5790                 softc->ipf_userifqs++;
5791         }
5792         MUTEX_EXIT(&softc->ipf_timeoutlock);
5793         return ifq;
5794 }
5795
5796
5797 /* ------------------------------------------------------------------------ */
5798 /* Function:    ipf_deletetimeoutqueue                                      */
5799 /* Returns:     int    - new reference count value of the timeout queue     */
5800 /* Parameters:  ifq(I) - timeout queue which is losing a reference.         */
5801 /* Locks:       ifq->ifq_lock                                               */
5802 /*                                                                          */
5803 /* This routine must be called when we're discarding a pointer to a timeout */
5804 /* queue object, taking care of the reference counter.                      */
5805 /*                                                                          */
5806 /* Now that this just sets a DELETE flag, it requires the expire code to    */
5807 /* check the list of user defined timeout queues and call the free function */
5808 /* below (currently commented out) to stop memory leaking.  It is done this */
5809 /* way because the locking may not be sufficient to safely do a free when   */
5810 /* this function is called.                                                 */
5811 /* ------------------------------------------------------------------------ */
5812 int
5813 ipf_deletetimeoutqueue(ifq)
5814         ipftq_t *ifq;
5815 {
5816
5817         ifq->ifq_ref--;
5818         if ((ifq->ifq_ref == 0) && ((ifq->ifq_flags & IFQF_USER) != 0)) {
5819                 ifq->ifq_flags |= IFQF_DELETE;
5820         }
5821
5822         return ifq->ifq_ref;
5823 }
5824
5825
5826 /* ------------------------------------------------------------------------ */
5827 /* Function:    ipf_freetimeoutqueue                                        */
5828 /* Parameters:  ifq(I) - timeout queue which is losing a reference.         */
5829 /* Returns:     Nil                                                         */
5830 /*                                                                          */
5831 /* Locking:                                                                 */
5832 /* It is assumed that the caller of this function has an appropriate lock   */
5833 /* held (exclusively) in the domain that encompases the callers "domain".   */
5834 /* The ifq_lock for this structure should not be held.                      */
5835 /*                                                                          */
5836 /* Remove a user defined timeout queue from the list of queues it is in and */
5837 /* tidy up after this is done.                                              */
5838 /* ------------------------------------------------------------------------ */
5839 void
5840 ipf_freetimeoutqueue(softc, ifq)
5841         ipf_main_softc_t *softc;
5842         ipftq_t *ifq;
5843 {
5844
5845         if (((ifq->ifq_flags & IFQF_DELETE) == 0) || (ifq->ifq_ref != 0) ||
5846             ((ifq->ifq_flags & IFQF_USER) == 0)) {
5847                 printf("ipf_freetimeoutqueue(%lx) flags 0x%x ttl %d ref %d\n",
5848                        (u_long)ifq, ifq->ifq_flags, ifq->ifq_ttl,
5849                        ifq->ifq_ref);
5850                 return;
5851         }
5852
5853         /*
5854          * Remove from its position in the list.
5855          */
5856         *ifq->ifq_pnext = ifq->ifq_next;
5857         if (ifq->ifq_next != NULL)
5858                 ifq->ifq_next->ifq_pnext = ifq->ifq_pnext;
5859         ifq->ifq_next = NULL;
5860         ifq->ifq_pnext = NULL;
5861
5862         MUTEX_DESTROY(&ifq->ifq_lock);
5863         ATOMIC_DEC(softc->ipf_userifqs);
5864         KFREE(ifq);
5865 }
5866
5867
5868 /* ------------------------------------------------------------------------ */
5869 /* Function:    ipf_deletequeueentry                                        */
5870 /* Returns:     Nil                                                         */
5871 /* Parameters:  tqe(I) - timeout queue entry to delete                      */
5872 /*                                                                          */
5873 /* Remove a tail queue entry from its queue and make it an orphan.          */
5874 /* ipf_deletetimeoutqueue is called to make sure the reference count on the */
5875 /* queue is correct.  We can't, however, call ipf_freetimeoutqueue because  */
5876 /* the correct lock(s) may not be held that would make it safe to do so.    */
5877 /* ------------------------------------------------------------------------ */
5878 void
5879 ipf_deletequeueentry(tqe)
5880         ipftqent_t *tqe;
5881 {
5882         ipftq_t *ifq;
5883
5884         ifq = tqe->tqe_ifq;
5885
5886         MUTEX_ENTER(&ifq->ifq_lock);
5887
5888         if (tqe->tqe_pnext != NULL) {
5889                 *tqe->tqe_pnext = tqe->tqe_next;
5890                 if (tqe->tqe_next != NULL)
5891                         tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5892                 else    /* we must be the tail anyway */
5893                         ifq->ifq_tail = tqe->tqe_pnext;
5894
5895                 tqe->tqe_pnext = NULL;
5896                 tqe->tqe_ifq = NULL;
5897         }
5898
5899         (void) ipf_deletetimeoutqueue(ifq);
5900         ASSERT(ifq->ifq_ref > 0);
5901
5902         MUTEX_EXIT(&ifq->ifq_lock);
5903 }
5904
5905
5906 /* ------------------------------------------------------------------------ */
5907 /* Function:    ipf_queuefront                                              */
5908 /* Returns:     Nil                                                         */
5909 /* Parameters:  tqe(I) - pointer to timeout queue entry                     */
5910 /*                                                                          */
5911 /* Move a queue entry to the front of the queue, if it isn't already there. */
5912 /* ------------------------------------------------------------------------ */
5913 void
5914 ipf_queuefront(tqe)
5915         ipftqent_t *tqe;
5916 {
5917         ipftq_t *ifq;
5918
5919         ifq = tqe->tqe_ifq;
5920         if (ifq == NULL)
5921                 return;
5922
5923         MUTEX_ENTER(&ifq->ifq_lock);
5924         if (ifq->ifq_head != tqe) {
5925                 *tqe->tqe_pnext = tqe->tqe_next;
5926                 if (tqe->tqe_next)
5927                         tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5928                 else
5929                         ifq->ifq_tail = tqe->tqe_pnext;
5930
5931                 tqe->tqe_next = ifq->ifq_head;
5932                 ifq->ifq_head->tqe_pnext = &tqe->tqe_next;
5933                 ifq->ifq_head = tqe;
5934                 tqe->tqe_pnext = &ifq->ifq_head;
5935         }
5936         MUTEX_EXIT(&ifq->ifq_lock);
5937 }
5938
5939
5940 /* ------------------------------------------------------------------------ */
5941 /* Function:    ipf_queueback                                               */
5942 /* Returns:     Nil                                                         */
5943 /* Parameters:  ticks(I) - ipf tick time to use with this call              */
5944 /*              tqe(I)   - pointer to timeout queue entry                   */
5945 /*                                                                          */
5946 /* Move a queue entry to the back of the queue, if it isn't already there.  */
5947 /* We use use ticks to calculate the expiration and mark for when we last   */
5948 /* touched the structure.                                                   */
5949 /* ------------------------------------------------------------------------ */
5950 void
5951 ipf_queueback(ticks, tqe)
5952         u_long ticks;
5953         ipftqent_t *tqe;
5954 {
5955         ipftq_t *ifq;
5956
5957         ifq = tqe->tqe_ifq;
5958         if (ifq == NULL)
5959                 return;
5960         tqe->tqe_die = ticks + ifq->ifq_ttl;
5961         tqe->tqe_touched = ticks;
5962
5963         MUTEX_ENTER(&ifq->ifq_lock);
5964         if (tqe->tqe_next != NULL) {            /* at the end already ? */
5965                 /*
5966                  * Remove from list
5967                  */
5968                 *tqe->tqe_pnext = tqe->tqe_next;
5969                 tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5970
5971                 /*
5972                  * Make it the last entry.
5973                  */
5974                 tqe->tqe_next = NULL;
5975                 tqe->tqe_pnext = ifq->ifq_tail;
5976                 *ifq->ifq_tail = tqe;
5977                 ifq->ifq_tail = &tqe->tqe_next;
5978         }
5979         MUTEX_EXIT(&ifq->ifq_lock);
5980 }
5981
5982
5983 /* ------------------------------------------------------------------------ */
5984 /* Function:    ipf_queueappend                                             */
5985 /* Returns:     Nil                                                         */
5986 /* Parameters:  ticks(I)  - ipf tick time to use with this call             */
5987 /*              tqe(I)    - pointer to timeout queue entry                  */
5988 /*              ifq(I)    - pointer to timeout queue                        */
5989 /*              parent(I) - owing object pointer                            */
5990 /*                                                                          */
5991 /* Add a new item to this queue and put it on the very end.                 */
5992 /* We use use ticks to calculate the expiration and mark for when we last   */
5993 /* touched the structure.                                                   */
5994 /* ------------------------------------------------------------------------ */
5995 void
5996 ipf_queueappend(ticks, tqe, ifq, parent)
5997         u_long ticks;
5998         ipftqent_t *tqe;
5999         ipftq_t *ifq;
6000         void *parent;
6001 {
6002
6003         MUTEX_ENTER(&ifq->ifq_lock);
6004         tqe->tqe_parent = parent;
6005         tqe->tqe_pnext = ifq->ifq_tail;
6006         *ifq->ifq_tail = tqe;
6007         ifq->ifq_tail = &tqe->tqe_next;
6008         tqe->tqe_next = NULL;
6009         tqe->tqe_ifq = ifq;
6010         tqe->tqe_die = ticks + ifq->ifq_ttl;
6011         tqe->tqe_touched = ticks;
6012         ifq->ifq_ref++;
6013         MUTEX_EXIT(&ifq->ifq_lock);
6014 }
6015
6016
6017 /* ------------------------------------------------------------------------ */
6018 /* Function:    ipf_movequeue                                               */
6019 /* Returns:     Nil                                                         */
6020 /* Parameters:  tq(I)   - pointer to timeout queue information              */
6021 /*              oifp(I) - old timeout queue entry was on                    */
6022 /*              nifp(I) - new timeout queue to put entry on                 */
6023 /*                                                                          */
6024 /* Move a queue entry from one timeout queue to another timeout queue.      */
6025 /* If it notices that the current entry is already last and does not need   */
6026 /* to move queue, the return.                                               */
6027 /* ------------------------------------------------------------------------ */
6028 void
6029 ipf_movequeue(ticks, tqe, oifq, nifq)
6030         u_long ticks;
6031         ipftqent_t *tqe;
6032         ipftq_t *oifq, *nifq;
6033 {
6034
6035         /*
6036          * If the queue hasn't changed and we last touched this entry at the
6037          * same ipf time, then we're not going to achieve anything by either
6038          * changing the ttl or moving it on the queue.
6039          */
6040         if (oifq == nifq && tqe->tqe_touched == ticks)
6041                 return;
6042
6043         /*
6044          * For any of this to be outside the lock, there is a risk that two
6045          * packets entering simultaneously, with one changing to a different
6046          * queue and one not, could end up with things in a bizarre state.
6047          */
6048         MUTEX_ENTER(&oifq->ifq_lock);
6049
6050         tqe->tqe_touched = ticks;
6051         tqe->tqe_die = ticks + nifq->ifq_ttl;
6052         /*
6053          * Is the operation here going to be a no-op ?
6054          */
6055         if (oifq == nifq) {
6056                 if ((tqe->tqe_next == NULL) ||
6057                     (tqe->tqe_next->tqe_die == tqe->tqe_die)) {
6058                         MUTEX_EXIT(&oifq->ifq_lock);
6059                         return;
6060                 }
6061         }
6062
6063         /*
6064          * Remove from the old queue
6065          */
6066         *tqe->tqe_pnext = tqe->tqe_next;
6067         if (tqe->tqe_next)
6068                 tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
6069         else
6070                 oifq->ifq_tail = tqe->tqe_pnext;
6071         tqe->tqe_next = NULL;
6072
6073         /*
6074          * If we're moving from one queue to another, release the
6075          * lock on the old queue and get a lock on the new queue.
6076          * For user defined queues, if we're moving off it, call
6077          * delete in case it can now be freed.
6078          */
6079         if (oifq != nifq) {
6080                 tqe->tqe_ifq = NULL;
6081
6082                 (void) ipf_deletetimeoutqueue(oifq);
6083
6084                 MUTEX_EXIT(&oifq->ifq_lock);
6085
6086                 MUTEX_ENTER(&nifq->ifq_lock);
6087
6088                 tqe->tqe_ifq = nifq;
6089                 nifq->ifq_ref++;
6090         }
6091
6092         /*
6093          * Add to the bottom of the new queue
6094          */
6095         tqe->tqe_pnext = nifq->ifq_tail;
6096         *nifq->ifq_tail = tqe;
6097         nifq->ifq_tail = &tqe->tqe_next;
6098         MUTEX_EXIT(&nifq->ifq_lock);
6099 }
6100
6101
6102 /* ------------------------------------------------------------------------ */
6103 /* Function:    ipf_updateipid                                              */
6104 /* Returns:     int - 0 == success, -1 == error (packet should be droppped) */
6105 /* Parameters:  fin(I) - pointer to packet information                      */
6106 /*                                                                          */
6107 /* When we are doing NAT, change the IP of every packet to represent a      */
6108 /* single sequence of packets coming from the host, hiding any host         */
6109 /* specific sequencing that might otherwise be revealed.  If the packet is  */
6110 /* a fragment, then store the 'new' IPid in the fragment cache and look up  */
6111 /* the fragment cache for non-leading fragments.  If a non-leading fragment */
6112 /* has no match in the cache, return an error.                              */
6113 /* ------------------------------------------------------------------------ */
6114 static int
6115 ipf_updateipid(fin)
6116         fr_info_t *fin;
6117 {
6118         u_short id, ido, sums;
6119         u_32_t sumd, sum;
6120         ip_t *ip;
6121
6122         ip = fin->fin_ip;
6123         ido = ntohs(ip->ip_id);
6124         if (fin->fin_off != 0) {
6125                 sum = ipf_frag_ipidknown(fin);
6126                 if (sum == 0xffffffff)
6127                         return -1;
6128                 sum &= 0xffff;
6129                 id = (u_short)sum;
6130                 ip->ip_id = htons(id);
6131         } else {
6132                 ip_fillid(ip);
6133                 id = ntohs(ip->ip_id);
6134                 if ((fin->fin_flx & FI_FRAG) != 0)
6135                         (void) ipf_frag_ipidnew(fin, (u_32_t)id);
6136         }
6137
6138         if (id == ido)
6139                 return 0;
6140         CALC_SUMD(ido, id, sumd);       /* DESTRUCTIVE MACRO! id,ido change */
6141         sum = (~ntohs(ip->ip_sum)) & 0xffff;
6142         sum += sumd;
6143         sum = (sum >> 16) + (sum & 0xffff);
6144         sum = (sum >> 16) + (sum & 0xffff);
6145         sums = ~(u_short)sum;
6146         ip->ip_sum = htons(sums);
6147         return 0;
6148 }
6149
6150
6151 #ifdef  NEED_FRGETIFNAME
6152 /* ------------------------------------------------------------------------ */
6153 /* Function:    ipf_getifname                                               */
6154 /* Returns:     char *    - pointer to interface name                       */
6155 /* Parameters:  ifp(I)    - pointer to network interface                    */
6156 /*              buffer(O) - pointer to where to store interface name        */
6157 /*                                                                          */
6158 /* Constructs an interface name in the buffer passed.  The buffer passed is */
6159 /* expected to be at least LIFNAMSIZ in bytes big.  If buffer is passed in  */
6160 /* as a NULL pointer then return a pointer to a static array.               */
6161 /* ------------------------------------------------------------------------ */
6162 char *
6163 ipf_getifname(ifp, buffer)
6164         struct ifnet *ifp;
6165         char *buffer;
6166 {
6167         static char namebuf[LIFNAMSIZ];
6168 # if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \
6169      defined(__sgi) || defined(linux) || defined(_AIX51) || \
6170      (defined(sun) && !defined(__SVR4) && !defined(__svr4__))
6171         int unit, space;
6172         char temp[20];
6173         char *s;
6174 # endif
6175
6176         if (buffer == NULL)
6177                 buffer = namebuf;
6178         (void) strncpy(buffer, ifp->if_name, LIFNAMSIZ);
6179         buffer[LIFNAMSIZ - 1] = '\0';
6180 # if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \
6181      defined(__sgi) || defined(_AIX51) || \
6182      (defined(sun) && !defined(__SVR4) && !defined(__svr4__))
6183         for (s = buffer; *s; s++)
6184                 ;
6185         unit = ifp->if_unit;
6186         space = LIFNAMSIZ - (s - buffer);
6187         if ((space > 0) && (unit >= 0)) {
6188 #  if defined(SNPRINTF) && defined(_KERNEL)
6189                 SNPRINTF(temp, sizeof(temp), "%d", unit);
6190 #  else
6191                 (void) sprintf(temp, "%d", unit);
6192 #  endif
6193                 (void) strncpy(s, temp, space);
6194         }
6195 # endif
6196         return buffer;
6197 }
6198 #endif
6199
6200
6201 /* ------------------------------------------------------------------------ */
6202 /* Function:    ipf_ioctlswitch                                             */
6203 /* Returns:     int     - -1 continue processing, else ioctl return value   */
6204 /* Parameters:  unit(I) - device unit opened                                */
6205 /*              data(I) - pointer to ioctl data                             */
6206 /*              cmd(I)  - ioctl command                                     */
6207 /*              mode(I) - mode value                                        */
6208 /*              uid(I)  - uid making the ioctl call                         */
6209 /*              ctx(I)  - pointer to context data                           */
6210 /*                                                                          */
6211 /* Based on the value of unit, call the appropriate ioctl handler or return */
6212 /* EIO if ipfilter is not running.   Also checks if write perms are req'd   */
6213 /* for the device in order to execute the ioctl.  A special case is made    */
6214 /* SIOCIPFINTERROR so that the same code isn't required in every handler.   */
6215 /* The context data pointer is passed through as this is used as the key    */
6216 /* for locating a matching token for continued access for walking lists,    */
6217 /* etc.                                                                     */
6218 /* ------------------------------------------------------------------------ */
6219 int
6220 ipf_ioctlswitch(softc, unit, data, cmd, mode, uid, ctx)
6221         ipf_main_softc_t *softc;
6222         int unit, mode, uid;
6223         ioctlcmd_t cmd;
6224         void *data, *ctx;
6225 {
6226         int error = 0;
6227
6228         switch (cmd)
6229         {
6230         case SIOCIPFINTERROR :
6231                 error = BCOPYOUT(&softc->ipf_interror, data,
6232                                  sizeof(softc->ipf_interror));
6233                 if (error != 0) {
6234                         IPFERROR(40);
6235                         error = EFAULT;
6236                 }
6237                 return error;
6238         default :
6239                 break;
6240         }
6241
6242         switch (unit)
6243         {
6244         case IPL_LOGIPF :
6245                 error = ipf_ipf_ioctl(softc, data, cmd, mode, uid, ctx);
6246                 break;
6247         case IPL_LOGNAT :
6248                 if (softc->ipf_running > 0) {
6249                         error = ipf_nat_ioctl(softc, data, cmd, mode,
6250                                               uid, ctx);
6251                 } else {
6252                         IPFERROR(42);
6253                         error = EIO;
6254                 }
6255                 break;
6256         case IPL_LOGSTATE :
6257                 if (softc->ipf_running > 0) {
6258                         error = ipf_state_ioctl(softc, data, cmd, mode,
6259                                                 uid, ctx);
6260                 } else {
6261                         IPFERROR(43);
6262                         error = EIO;
6263                 }
6264                 break;
6265         case IPL_LOGAUTH :
6266                 if (softc->ipf_running > 0) {
6267                         error = ipf_auth_ioctl(softc, data, cmd, mode,
6268                                                uid, ctx);
6269                 } else {
6270                         IPFERROR(44);
6271                         error = EIO;
6272                 }
6273                 break;
6274         case IPL_LOGSYNC :
6275                 if (softc->ipf_running > 0) {
6276                         error = ipf_sync_ioctl(softc, data, cmd, mode,
6277                                                uid, ctx);
6278                 } else {
6279                         error = EIO;
6280                         IPFERROR(45);
6281                 }
6282                 break;
6283         case IPL_LOGSCAN :
6284 #ifdef IPFILTER_SCAN
6285                 if (softc->ipf_running > 0)
6286                         error = ipf_scan_ioctl(softc, data, cmd, mode,
6287                                                uid, ctx);
6288                 else
6289 #endif
6290                 {
6291                         error = EIO;
6292                         IPFERROR(46);
6293                 }
6294                 break;
6295         case IPL_LOGLOOKUP :
6296                 if (softc->ipf_running > 0) {
6297                         error = ipf_lookup_ioctl(softc, data, cmd, mode,
6298                                                  uid, ctx);
6299                 } else {
6300                         error = EIO;
6301                         IPFERROR(47);
6302                 }
6303                 break;
6304         default :
6305                 IPFERROR(48);
6306                 error = EIO;
6307                 break;
6308         }
6309
6310         return error;
6311 }
6312
6313
6314 /*
6315  * This array defines the expected size of objects coming into the kernel
6316  * for the various recognised object types. The first column is flags (see
6317  * below), 2nd column is current size, 3rd column is the version number of
6318  * when the current size became current.
6319  * Flags:
6320  * 1 = minimum size, not absolute size
6321  */
6322 static  int     ipf_objbytes[IPFOBJ_COUNT][3] = {
6323         { 1,    sizeof(struct frentry),         5010000 },      /* 0 */
6324         { 1,    sizeof(struct friostat),        5010000 },
6325         { 0,    sizeof(struct fr_info),         5010000 },
6326         { 0,    sizeof(struct ipf_authstat),    4010100 },
6327         { 0,    sizeof(struct ipfrstat),        5010000 },
6328         { 1,    sizeof(struct ipnat),           5010000 },      /* 5 */
6329         { 0,    sizeof(struct natstat),         5010000 },
6330         { 0,    sizeof(struct ipstate_save),    5010000 },
6331         { 1,    sizeof(struct nat_save),        5010000 },
6332         { 0,    sizeof(struct natlookup),       5010000 },
6333         { 1,    sizeof(struct ipstate),         5010000 },      /* 10 */
6334         { 0,    sizeof(struct ips_stat),        5010000 },
6335         { 0,    sizeof(struct frauth),          5010000 },
6336         { 0,    sizeof(struct ipftune),         4010100 },
6337         { 0,    sizeof(struct nat),             5010000 },
6338         { 0,    sizeof(struct ipfruleiter),     4011400 },      /* 15 */
6339         { 0,    sizeof(struct ipfgeniter),      4011400 },
6340         { 0,    sizeof(struct ipftable),        4011400 },
6341         { 0,    sizeof(struct ipflookupiter),   4011400 },
6342         { 0,    sizeof(struct ipftq) * IPF_TCP_NSTATES },
6343         { 1,    0,                              0       }, /* IPFEXPR */
6344         { 0,    0,                              0       }, /* PROXYCTL */
6345         { 0,    sizeof (struct fripf),          5010000 }
6346 };
6347
6348
6349 /* ------------------------------------------------------------------------ */
6350 /* Function:    ipf_inobj                                                   */
6351 /* Returns:     int     - 0 = success, else failure                         */
6352 /* Parameters:  softc(I) - soft context pointerto work with                 */
6353 /*              data(I)  - pointer to ioctl data                            */
6354 /*              objp(O)  - where to store ipfobj structure                  */
6355 /*              ptr(I)   - pointer to data to copy out                      */
6356 /*              type(I)  - type of structure being moved                    */
6357 /*                                                                          */
6358 /* Copy in the contents of what the ipfobj_t points to.  In future, we      */
6359 /* add things to check for version numbers, sizes, etc, to make it backward */
6360 /* compatible at the ABI for user land.                                     */
6361 /* If objp is not NULL then we assume that the caller wants to see what is  */
6362 /* in the ipfobj_t structure being copied in. As an example, this can tell  */
6363 /* the caller what version of ipfilter the ioctl program was written to.    */
6364 /* ------------------------------------------------------------------------ */
6365 int
6366 ipf_inobj(softc, data, objp, ptr, type)
6367         ipf_main_softc_t *softc;
6368         void *data;
6369         ipfobj_t *objp;
6370         void *ptr;
6371         int type;
6372 {
6373         ipfobj_t obj;
6374         int error;
6375         int size;
6376
6377         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6378                 IPFERROR(49);
6379                 return EINVAL;
6380         }
6381
6382         if (objp == NULL)
6383                 objp = &obj;
6384         error = BCOPYIN(data, objp, sizeof(*objp));
6385         if (error != 0) {
6386                 IPFERROR(124);
6387                 return EFAULT;
6388         }
6389
6390         if (objp->ipfo_type != type) {
6391                 IPFERROR(50);
6392                 return EINVAL;
6393         }
6394
6395         if (objp->ipfo_rev >= ipf_objbytes[type][2]) {
6396                 if ((ipf_objbytes[type][0] & 1) != 0) {
6397                         if (objp->ipfo_size < ipf_objbytes[type][1]) {
6398                                 IPFERROR(51);
6399                                 return EINVAL;
6400                         }
6401                         size =  ipf_objbytes[type][1];
6402                 } else if (objp->ipfo_size == ipf_objbytes[type][1]) {
6403                         size =  objp->ipfo_size;
6404                 } else {
6405                         IPFERROR(52);
6406                         return EINVAL;
6407                 }
6408                 error = COPYIN(objp->ipfo_ptr, ptr, size);
6409                 if (error != 0) {
6410                         IPFERROR(55);
6411                         error = EFAULT;
6412                 }
6413         } else {
6414 #ifdef  IPFILTER_COMPAT
6415                 error = ipf_in_compat(softc, objp, ptr, 0);
6416 #else
6417                 IPFERROR(54);
6418                 error = EINVAL;
6419 #endif
6420         }
6421         return error;
6422 }
6423
6424
6425 /* ------------------------------------------------------------------------ */
6426 /* Function:    ipf_inobjsz                                                 */
6427 /* Returns:     int     - 0 = success, else failure                         */
6428 /* Parameters:  softc(I) - soft context pointerto work with                 */
6429 /*              data(I)  - pointer to ioctl data                            */
6430 /*              ptr(I)   - pointer to store real data in                    */
6431 /*              type(I)  - type of structure being moved                    */
6432 /*              sz(I)    - size of data to copy                             */
6433 /*                                                                          */
6434 /* As per ipf_inobj, except the size of the object to copy in is passed in  */
6435 /* but it must not be smaller than the size defined for the type and the    */
6436 /* type must allow for varied sized objects.  The extra requirement here is */
6437 /* that sz must match the size of the object being passed in - this is not  */
6438 /* not possible nor required in ipf_inobj().                                */
6439 /* ------------------------------------------------------------------------ */
6440 int
6441 ipf_inobjsz(softc, data, ptr, type, sz)
6442         ipf_main_softc_t *softc;
6443         void *data;
6444         void *ptr;
6445         int type, sz;
6446 {
6447         ipfobj_t obj;
6448         int error;
6449
6450         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6451                 IPFERROR(56);
6452                 return EINVAL;
6453         }
6454
6455         error = BCOPYIN(data, &obj, sizeof(obj));
6456         if (error != 0) {
6457                 IPFERROR(125);
6458                 return EFAULT;
6459         }
6460
6461         if (obj.ipfo_type != type) {
6462                 IPFERROR(58);
6463                 return EINVAL;
6464         }
6465
6466         if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6467                 if (((ipf_objbytes[type][0] & 1) == 0) ||
6468                     (sz < ipf_objbytes[type][1])) {
6469                         IPFERROR(57);
6470                         return EINVAL;
6471                 }
6472                 error = COPYIN(obj.ipfo_ptr, ptr, sz);
6473                 if (error != 0) {
6474                         IPFERROR(61);
6475                         error = EFAULT;
6476                 }
6477         } else {
6478 #ifdef  IPFILTER_COMPAT
6479                 error = ipf_in_compat(softc, &obj, ptr, sz);
6480 #else
6481                 IPFERROR(60);
6482                 error = EINVAL;
6483 #endif
6484         }
6485         return error;
6486 }
6487
6488
6489 /* ------------------------------------------------------------------------ */
6490 /* Function:    ipf_outobjsz                                                */
6491 /* Returns:     int     - 0 = success, else failure                         */
6492 /* Parameters:  data(I) - pointer to ioctl data                             */
6493 /*              ptr(I)  - pointer to store real data in                     */
6494 /*              type(I) - type of structure being moved                     */
6495 /*              sz(I)   - size of data to copy                              */
6496 /*                                                                          */
6497 /* As per ipf_outobj, except the size of the object to copy out is passed in*/
6498 /* but it must not be smaller than the size defined for the type and the    */
6499 /* type must allow for varied sized objects.  The extra requirement here is */
6500 /* that sz must match the size of the object being passed in - this is not  */
6501 /* not possible nor required in ipf_outobj().                               */
6502 /* ------------------------------------------------------------------------ */
6503 int
6504 ipf_outobjsz(softc, data, ptr, type, sz)
6505         ipf_main_softc_t *softc;
6506         void *data;
6507         void *ptr;
6508         int type, sz;
6509 {
6510         ipfobj_t obj;
6511         int error;
6512
6513         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6514                 IPFERROR(62);
6515                 return EINVAL;
6516         }
6517
6518         error = BCOPYIN(data, &obj, sizeof(obj));
6519         if (error != 0) {
6520                 IPFERROR(127);
6521                 return EFAULT;
6522         }
6523
6524         if (obj.ipfo_type != type) {
6525                 IPFERROR(63);
6526                 return EINVAL;
6527         }
6528
6529         if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6530                 if (((ipf_objbytes[type][0] & 1) == 0) ||
6531                     (sz < ipf_objbytes[type][1])) {
6532                         IPFERROR(146);
6533                         return EINVAL;
6534                 }
6535                 error = COPYOUT(ptr, obj.ipfo_ptr, sz);
6536                 if (error != 0) {
6537                         IPFERROR(66);
6538                         error = EFAULT;
6539                 }
6540         } else {
6541 #ifdef  IPFILTER_COMPAT
6542                 error = ipf_out_compat(softc, &obj, ptr);
6543 #else
6544                 IPFERROR(65);
6545                 error = EINVAL;
6546 #endif
6547         }
6548         return error;
6549 }
6550
6551
6552 /* ------------------------------------------------------------------------ */
6553 /* Function:    ipf_outobj                                                  */
6554 /* Returns:     int     - 0 = success, else failure                         */
6555 /* Parameters:  data(I) - pointer to ioctl data                             */
6556 /*              ptr(I)  - pointer to store real data in                     */
6557 /*              type(I) - type of structure being moved                     */
6558 /*                                                                          */
6559 /* Copy out the contents of what ptr is to where ipfobj points to.  In      */
6560 /* future, we add things to check for version numbers, sizes, etc, to make  */
6561 /* it backward  compatible at the ABI for user land.                        */
6562 /* ------------------------------------------------------------------------ */
6563 int
6564 ipf_outobj(softc, data, ptr, type)
6565         ipf_main_softc_t *softc;
6566         void *data;
6567         void *ptr;
6568         int type;
6569 {
6570         ipfobj_t obj;
6571         int error;
6572
6573         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6574                 IPFERROR(67);
6575                 return EINVAL;
6576         }
6577
6578         error = BCOPYIN(data, &obj, sizeof(obj));
6579         if (error != 0) {
6580                 IPFERROR(126);
6581                 return EFAULT;
6582         }
6583
6584         if (obj.ipfo_type != type) {
6585                 IPFERROR(68);
6586                 return EINVAL;
6587         }
6588
6589         if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6590                 if ((ipf_objbytes[type][0] & 1) != 0) {
6591                         if (obj.ipfo_size < ipf_objbytes[type][1]) {
6592                                 IPFERROR(69);
6593                                 return EINVAL;
6594                         }
6595                 } else if (obj.ipfo_size != ipf_objbytes[type][1]) {
6596                         IPFERROR(70);
6597                         return EINVAL;
6598                 }
6599
6600                 error = COPYOUT(ptr, obj.ipfo_ptr, obj.ipfo_size);
6601                 if (error != 0) {
6602                         IPFERROR(73);
6603                         error = EFAULT;
6604                 }
6605         } else {
6606 #ifdef  IPFILTER_COMPAT
6607                 error = ipf_out_compat(softc, &obj, ptr);
6608 #else
6609                 IPFERROR(72);
6610                 error = EINVAL;
6611 #endif
6612         }
6613         return error;
6614 }
6615
6616
6617 /* ------------------------------------------------------------------------ */
6618 /* Function:    ipf_outobjk                                                 */
6619 /* Returns:     int     - 0 = success, else failure                         */
6620 /* Parameters:  obj(I)  - pointer to data description structure             */
6621 /*              ptr(I)  - pointer to kernel data to copy out                */
6622 /*                                                                          */
6623 /* In the above functions, the ipfobj_t structure is copied into the kernel,*/
6624 /* telling ipfilter how to copy out data. In this instance, the ipfobj_t is */
6625 /* already populated with information and now we just need to use it.       */
6626 /* There is no need for this function to have a "type" parameter as there   */
6627 /* is no point in validating information that comes from the kernel with    */
6628 /* itself.                                                                  */
6629 /* ------------------------------------------------------------------------ */
6630 int
6631 ipf_outobjk(softc, obj, ptr)
6632         ipf_main_softc_t *softc;
6633         ipfobj_t *obj;
6634         void *ptr;
6635 {
6636         int type = obj->ipfo_type;
6637         int error;
6638
6639         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6640                 IPFERROR(147);
6641                 return EINVAL;
6642         }
6643
6644         if (obj->ipfo_rev >= ipf_objbytes[type][2]) {
6645                 if ((ipf_objbytes[type][0] & 1) != 0) {
6646                         if (obj->ipfo_size < ipf_objbytes[type][1]) {
6647                                 IPFERROR(148);
6648                                 return EINVAL;
6649                         }
6650
6651                 } else if (obj->ipfo_size != ipf_objbytes[type][1]) {
6652                         IPFERROR(149);
6653                         return EINVAL;
6654                 }
6655
6656                 error = COPYOUT(ptr, obj->ipfo_ptr, obj->ipfo_size);
6657                 if (error != 0) {
6658                         IPFERROR(150);
6659                         error = EFAULT;
6660                 }
6661         } else {
6662 #ifdef  IPFILTER_COMPAT
6663                 error = ipf_out_compat(softc, obj, ptr);
6664 #else
6665                 IPFERROR(151);
6666                 error = EINVAL;
6667 #endif
6668         }
6669         return error;
6670 }
6671
6672
6673 /* ------------------------------------------------------------------------ */
6674 /* Function:    ipf_checkl4sum                                              */
6675 /* Returns:     int     - 0 = good, -1 = bad, 1 = cannot check              */
6676 /* Parameters:  fin(I) - pointer to packet information                      */
6677 /*                                                                          */
6678 /* If possible, calculate the layer 4 checksum for the packet.  If this is  */
6679 /* not possible, return without indicating a failure or success but in a    */
6680 /* way that is ditinguishable. This function should only be called by the   */
6681 /* ipf_checkv6sum() for each platform.                                      */
6682 /* ------------------------------------------------------------------------ */
6683 INLINE int
6684 ipf_checkl4sum(fin)
6685         fr_info_t *fin;
6686 {
6687         u_short sum, hdrsum, *csump;
6688         udphdr_t *udp;
6689         int dosum;
6690
6691         /*
6692          * If the TCP packet isn't a fragment, isn't too short and otherwise
6693          * isn't already considered "bad", then validate the checksum.  If
6694          * this check fails then considered the packet to be "bad".
6695          */
6696         if ((fin->fin_flx & (FI_FRAG|FI_SHORT|FI_BAD)) != 0)
6697                 return 1;
6698
6699         csump = NULL;
6700         hdrsum = 0;
6701         dosum = 0;
6702         sum = 0;
6703
6704         switch (fin->fin_p)
6705         {
6706         case IPPROTO_TCP :
6707                 csump = &((tcphdr_t *)fin->fin_dp)->th_sum;
6708                 dosum = 1;
6709                 break;
6710
6711         case IPPROTO_UDP :
6712                 udp = fin->fin_dp;
6713                 if (udp->uh_sum != 0) {
6714                         csump = &udp->uh_sum;
6715                         dosum = 1;
6716                 }
6717                 break;
6718
6719 #ifdef USE_INET6
6720         case IPPROTO_ICMPV6 :
6721                 csump = &((struct icmp6_hdr *)fin->fin_dp)->icmp6_cksum;
6722                 dosum = 1;
6723                 break;
6724 #endif
6725
6726         case IPPROTO_ICMP :
6727                 csump = &((struct icmp *)fin->fin_dp)->icmp_cksum;
6728                 dosum = 1;
6729                 break;
6730
6731         default :
6732                 return 1;
6733                 /*NOTREACHED*/
6734         }
6735
6736         if (csump != NULL)
6737                 hdrsum = *csump;
6738
6739         if (dosum) {
6740                 sum = fr_cksum(fin, fin->fin_ip, fin->fin_p, fin->fin_dp);
6741         }
6742 #if !defined(_KERNEL)
6743         if (sum == hdrsum) {
6744                 FR_DEBUG(("checkl4sum: %hx == %hx\n", sum, hdrsum));
6745         } else {
6746                 FR_DEBUG(("checkl4sum: %hx != %hx\n", sum, hdrsum));
6747         }
6748 #endif
6749         DT2(l4sums, u_short, hdrsum, u_short, sum);
6750         if (hdrsum == sum) {
6751                 fin->fin_cksum = FI_CK_SUMOK;
6752                 return 0;
6753         }
6754         fin->fin_cksum = FI_CK_BAD;
6755         return -1;
6756 }
6757
6758
6759 /* ------------------------------------------------------------------------ */
6760 /* Function:    ipf_ifpfillv4addr                                           */
6761 /* Returns:     int     - 0 = address update, -1 = address not updated      */
6762 /* Parameters:  atype(I)   - type of network address update to perform      */
6763 /*              sin(I)     - pointer to source of address information       */
6764 /*              mask(I)    - pointer to source of netmask information       */
6765 /*              inp(I)     - pointer to destination address store           */
6766 /*              inpmask(I) - pointer to destination netmask store           */
6767 /*                                                                          */
6768 /* Given a type of network address update (atype) to perform, copy          */
6769 /* information from sin/mask into inp/inpmask.  If ipnmask is NULL then no  */
6770 /* netmask update is performed unless FRI_NETMASKED is passed as atype, in  */
6771 /* which case the operation fails.  For all values of atype other than      */
6772 /* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s  */
6773 /* value.                                                                   */
6774 /* ------------------------------------------------------------------------ */
6775 int
6776 ipf_ifpfillv4addr(atype, sin, mask, inp, inpmask)
6777         int atype;
6778         struct sockaddr_in *sin, *mask;
6779         struct in_addr *inp, *inpmask;
6780 {
6781         if (inpmask != NULL && atype != FRI_NETMASKED)
6782                 inpmask->s_addr = 0xffffffff;
6783
6784         if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
6785                 if (atype == FRI_NETMASKED) {
6786                         if (inpmask == NULL)
6787                                 return -1;
6788                         inpmask->s_addr = mask->sin_addr.s_addr;
6789                 }
6790                 inp->s_addr = sin->sin_addr.s_addr & mask->sin_addr.s_addr;
6791         } else {
6792                 inp->s_addr = sin->sin_addr.s_addr;
6793         }
6794         return 0;
6795 }
6796
6797
6798 #ifdef  USE_INET6
6799 /* ------------------------------------------------------------------------ */
6800 /* Function:    ipf_ifpfillv6addr                                           */
6801 /* Returns:     int     - 0 = address update, -1 = address not updated      */
6802 /* Parameters:  atype(I)   - type of network address update to perform      */
6803 /*              sin(I)     - pointer to source of address information       */
6804 /*              mask(I)    - pointer to source of netmask information       */
6805 /*              inp(I)     - pointer to destination address store           */
6806 /*              inpmask(I) - pointer to destination netmask store           */
6807 /*                                                                          */
6808 /* Given a type of network address update (atype) to perform, copy          */
6809 /* information from sin/mask into inp/inpmask.  If ipnmask is NULL then no  */
6810 /* netmask update is performed unless FRI_NETMASKED is passed as atype, in  */
6811 /* which case the operation fails.  For all values of atype other than      */
6812 /* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s  */
6813 /* value.                                                                   */
6814 /* ------------------------------------------------------------------------ */
6815 int
6816 ipf_ifpfillv6addr(atype, sin, mask, inp, inpmask)
6817         int atype;
6818         struct sockaddr_in6 *sin, *mask;
6819         i6addr_t *inp, *inpmask;
6820 {
6821         i6addr_t *src, *and;
6822
6823         src = (i6addr_t *)&sin->sin6_addr;
6824         and = (i6addr_t *)&mask->sin6_addr;
6825
6826         if (inpmask != NULL && atype != FRI_NETMASKED) {
6827                 inpmask->i6[0] = 0xffffffff;
6828                 inpmask->i6[1] = 0xffffffff;
6829                 inpmask->i6[2] = 0xffffffff;
6830                 inpmask->i6[3] = 0xffffffff;
6831         }
6832
6833         if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
6834                 if (atype == FRI_NETMASKED) {
6835                         if (inpmask == NULL)
6836                                 return -1;
6837                         inpmask->i6[0] = and->i6[0];
6838                         inpmask->i6[1] = and->i6[1];
6839                         inpmask->i6[2] = and->i6[2];
6840                         inpmask->i6[3] = and->i6[3];
6841                 }
6842
6843                 inp->i6[0] = src->i6[0] & and->i6[0];
6844                 inp->i6[1] = src->i6[1] & and->i6[1];
6845                 inp->i6[2] = src->i6[2] & and->i6[2];
6846                 inp->i6[3] = src->i6[3] & and->i6[3];
6847         } else {
6848                 inp->i6[0] = src->i6[0];
6849                 inp->i6[1] = src->i6[1];
6850                 inp->i6[2] = src->i6[2];
6851                 inp->i6[3] = src->i6[3];
6852         }
6853         return 0;
6854 }
6855 #endif
6856
6857
6858 /* ------------------------------------------------------------------------ */
6859 /* Function:    ipf_matchtag                                                */
6860 /* Returns:     0 == mismatch, 1 == match.                                  */
6861 /* Parameters:  tag1(I) - pointer to first tag to compare                   */
6862 /*              tag2(I) - pointer to second tag to compare                  */
6863 /*                                                                          */
6864 /* Returns true (non-zero) or false(0) if the two tag structures can be     */
6865 /* considered to be a match or not match, respectively.  The tag is 16      */
6866 /* bytes long (16 characters) but that is overlayed with 4 32bit ints so    */
6867 /* compare the ints instead, for speed. tag1 is the master of the           */
6868 /* comparison.  This function should only be called with both tag1 and tag2 */
6869 /* as non-NULL pointers.                                                    */
6870 /* ------------------------------------------------------------------------ */
6871 int
6872 ipf_matchtag(tag1, tag2)
6873         ipftag_t *tag1, *tag2;
6874 {
6875         if (tag1 == tag2)
6876                 return 1;
6877
6878         if ((tag1->ipt_num[0] == 0) && (tag2->ipt_num[0] == 0))
6879                 return 1;
6880
6881         if ((tag1->ipt_num[0] == tag2->ipt_num[0]) &&
6882             (tag1->ipt_num[1] == tag2->ipt_num[1]) &&
6883             (tag1->ipt_num[2] == tag2->ipt_num[2]) &&
6884             (tag1->ipt_num[3] == tag2->ipt_num[3]))
6885                 return 1;
6886         return 0;
6887 }
6888
6889
6890 /* ------------------------------------------------------------------------ */
6891 /* Function:    ipf_coalesce                                                */
6892 /* Returns:     1 == success, -1 == failure, 0 == no change                 */
6893 /* Parameters:  fin(I) - pointer to packet information                      */
6894 /*                                                                          */
6895 /* Attempt to get all of the packet data into a single, contiguous buffer.  */
6896 /* If this call returns a failure then the buffers have also been freed.    */
6897 /* ------------------------------------------------------------------------ */
6898 int
6899 ipf_coalesce(fin)
6900         fr_info_t *fin;
6901 {
6902
6903         if ((fin->fin_flx & FI_COALESCE) != 0)
6904                 return 1;
6905
6906         /*
6907          * If the mbuf pointers indicate that there is no mbuf to work with,
6908          * return but do not indicate success or failure.
6909          */
6910         if (fin->fin_m == NULL || fin->fin_mp == NULL)
6911                 return 0;
6912
6913 #if defined(_KERNEL)
6914         if (ipf_pullup(fin->fin_m, fin, fin->fin_plen) == NULL) {
6915                 ipf_main_softc_t *softc = fin->fin_main_soft;
6916
6917                 DT1(frb_coalesce, fr_info_t *, fin);
6918                 LBUMP(ipf_stats[fin->fin_out].fr_badcoalesces);
6919 # ifdef MENTAT
6920                 FREE_MB_T(*fin->fin_mp);
6921 # endif
6922                 fin->fin_reason = FRB_COALESCE;
6923                 *fin->fin_mp = NULL;
6924                 fin->fin_m = NULL;
6925                 return -1;
6926         }
6927 #else
6928         fin = fin;      /* LINT */
6929 #endif
6930         return 1;
6931 }
6932
6933
6934 /*
6935  * The following table lists all of the tunable variables that can be
6936  * accessed via SIOCIPFGET/SIOCIPFSET/SIOCIPFGETNEXt.  The format of each row
6937  * in the table below is as follows:
6938  *
6939  * pointer to value, name of value, minimum, maximum, size of the value's
6940  *     container, value attribute flags
6941  *
6942  * For convienience, IPFT_RDONLY means the value is read-only, IPFT_WRDISABLED
6943  * means the value can only be written to when IPFilter is loaded but disabled.
6944  * The obvious implication is if neither of these are set then the value can be
6945  * changed at any time without harm.
6946  */
6947
6948
6949 /* ------------------------------------------------------------------------ */
6950 /* Function:    ipf_tune_findbycookie                                       */
6951 /* Returns:     NULL = search failed, else pointer to tune struct           */
6952 /* Parameters:  cookie(I) - cookie value to search for amongst tuneables    */
6953 /*              next(O)   - pointer to place to store the cookie for the    */
6954 /*                          "next" tuneable, if it is desired.              */
6955 /*                                                                          */
6956 /* This function is used to walk through all of the existing tunables with  */
6957 /* successive calls.  It searches the known tunables for the one which has  */
6958 /* a matching value for "cookie" - ie its address.  When returning a match, */
6959 /* the next one to be found may be returned inside next.                    */
6960 /* ------------------------------------------------------------------------ */
6961 static ipftuneable_t *
6962 ipf_tune_findbycookie(ptop, cookie, next)
6963         ipftuneable_t **ptop;
6964         void *cookie, **next;
6965 {
6966         ipftuneable_t *ta, **tap;
6967
6968         for (ta = *ptop; ta->ipft_name != NULL; ta++)
6969                 if (ta == cookie) {
6970                         if (next != NULL) {
6971                                 /*
6972                                  * If the next entry in the array has a name
6973                                  * present, then return a pointer to it for
6974                                  * where to go next, else return a pointer to
6975                                  * the dynaminc list as a key to search there
6976                                  * next.  This facilitates a weak linking of
6977                                  * the two "lists" together.
6978                                  */
6979                                 if ((ta + 1)->ipft_name != NULL)
6980                                         *next = ta + 1;
6981                                 else
6982                                         *next = ptop;
6983                         }
6984                         return ta;
6985                 }
6986
6987         for (tap = ptop; (ta = *tap) != NULL; tap = &ta->ipft_next)
6988                 if (tap == cookie) {
6989                         if (next != NULL)
6990                                 *next = &ta->ipft_next;
6991                         return ta;
6992                 }
6993
6994         if (next != NULL)
6995                 *next = NULL;
6996         return NULL;
6997 }
6998
6999
7000 /* ------------------------------------------------------------------------ */
7001 /* Function:    ipf_tune_findbyname                                         */
7002 /* Returns:     NULL = search failed, else pointer to tune struct           */
7003 /* Parameters:  name(I) - name of the tuneable entry to find.               */
7004 /*                                                                          */
7005 /* Search the static array of tuneables and the list of dynamic tuneables   */
7006 /* for an entry with a matching name.  If we can find one, return a pointer */
7007 /* to the matching structure.                                               */
7008 /* ------------------------------------------------------------------------ */
7009 static ipftuneable_t *
7010 ipf_tune_findbyname(top, name)
7011         ipftuneable_t *top;
7012         const char *name;
7013 {
7014         ipftuneable_t *ta;
7015
7016         for (ta = top; ta != NULL; ta = ta->ipft_next)
7017                 if (!strcmp(ta->ipft_name, name)) {
7018                         return ta;
7019                 }
7020
7021         return NULL;
7022 }
7023
7024
7025 /* ------------------------------------------------------------------------ */
7026 /* Function:    ipf_tune_add_array                                          */
7027 /* Returns:     int - 0 == success, else failure                            */
7028 /* Parameters:  newtune - pointer to new tune array to add to tuneables     */
7029 /*                                                                          */
7030 /* Appends tune structures from the array passed in (newtune) to the end of */
7031 /* the current list of "dynamic" tuneable parameters.                       */
7032 /* If any entry to be added is already present (by name) then the operation */
7033 /* is aborted - entries that have been added are removed before returning.  */
7034 /* An entry with no name (NULL) is used as the indication that the end of   */
7035 /* the array has been reached.                                              */
7036 /* ------------------------------------------------------------------------ */
7037 int
7038 ipf_tune_add_array(softc, newtune)
7039         ipf_main_softc_t *softc;
7040         ipftuneable_t *newtune;
7041 {
7042         ipftuneable_t *nt, *dt;
7043         int error = 0;
7044
7045         for (nt = newtune; nt->ipft_name != NULL; nt++) {
7046                 error = ipf_tune_add(softc, nt);
7047                 if (error != 0) {
7048                         for (dt = newtune; dt != nt; dt++) {
7049                                 (void) ipf_tune_del(softc, dt);
7050                         }
7051                 }
7052         }
7053
7054         return error;
7055 }
7056
7057
7058 /* ------------------------------------------------------------------------ */
7059 /* Function:    ipf_tune_array_link                                         */
7060 /* Returns:     0 == success, -1 == failure                                 */
7061 /* Parameters:  softc(I) - soft context pointerto work with                 */
7062 /*              array(I) - pointer to an array of tuneables                 */
7063 /*                                                                          */
7064 /* Given an array of tunables (array), append them to the current list of   */
7065 /* tuneables for this context (softc->ipf_tuners.) To properly prepare the  */
7066 /* the array for being appended to the list, initialise all of the next     */
7067 /* pointers so we don't need to walk parts of it with ++ and others with    */
7068 /* next. The array is expected to have an entry with a NULL name as the     */
7069 /* terminator. Trying to add an array with no non-NULL names will return as */
7070 /* a failure.                                                               */
7071 /* ------------------------------------------------------------------------ */
7072 int
7073 ipf_tune_array_link(softc, array)
7074         ipf_main_softc_t *softc;
7075         ipftuneable_t *array;
7076 {
7077         ipftuneable_t *t, **p;
7078
7079         t = array;
7080         if (t->ipft_name == NULL)
7081                 return -1;
7082
7083         for (; t[1].ipft_name != NULL; t++)
7084                 t[0].ipft_next = &t[1];
7085         t->ipft_next = NULL;
7086
7087         /*
7088          * Since a pointer to the last entry isn't kept, we need to find it
7089          * each time we want to add new variables to the list.
7090          */
7091         for (p = &softc->ipf_tuners; (t = *p) != NULL; p = &t->ipft_next)
7092                 if (t->ipft_name == NULL)
7093                         break;
7094         *p = array;
7095
7096         return 0;
7097 }
7098
7099
7100 /* ------------------------------------------------------------------------ */
7101 /* Function:    ipf_tune_array_unlink                                       */
7102 /* Returns:     0 == success, -1 == failure                                 */
7103 /* Parameters:  softc(I) - soft context pointerto work with                 */
7104 /*              array(I) - pointer to an array of tuneables                 */
7105 /*                                                                          */
7106 /* ------------------------------------------------------------------------ */
7107 int
7108 ipf_tune_array_unlink(softc, array)
7109         ipf_main_softc_t *softc;
7110         ipftuneable_t *array;
7111 {
7112         ipftuneable_t *t, **p;
7113
7114         for (p = &softc->ipf_tuners; (t = *p) != NULL; p = &t->ipft_next)
7115                 if (t == array)
7116                         break;
7117         if (t == NULL)
7118                 return -1;
7119
7120         for (; t[1].ipft_name != NULL; t++)
7121                 ;
7122
7123         *p = t->ipft_next;
7124
7125         return 0;
7126 }
7127
7128
7129 /* ------------------------------------------------------------------------ */
7130 /* Function:   ipf_tune_array_copy                                          */
7131 /* Returns:    NULL = failure, else pointer to new array                    */
7132 /* Parameters: base(I)     - pointer to structure base                      */
7133 /*             size(I)     - size of the array at template                  */
7134 /*             template(I) - original array to copy                         */
7135 /*                                                                          */
7136 /* Allocate memory for a new set of tuneable values and copy everything     */
7137 /* from template into the new region of memory.  The new region is full of  */
7138 /* uninitialised pointers (ipft_next) so set them up.  Now, ipftp_offset... */
7139 /*                                                                          */
7140 /* NOTE: the following assumes that sizeof(long) == sizeof(void *)          */
7141 /* In the array template, ipftp_offset is the offset (in bytes) of the      */
7142 /* location of the tuneable value inside the structure pointed to by base.  */
7143 /* As ipftp_offset is a union over the pointers to the tuneable values, if  */
7144 /* we add base to the copy's ipftp_offset, copy ends up with a pointer in   */
7145 /* ipftp_void that points to the stored value.                              */
7146 /* ------------------------------------------------------------------------ */
7147 ipftuneable_t *
7148 ipf_tune_array_copy(base, size, template)
7149         void *base;
7150         size_t size;
7151         ipftuneable_t *template;
7152 {
7153         ipftuneable_t *copy;
7154         int i;
7155
7156
7157         KMALLOCS(copy, ipftuneable_t *, size);
7158         if (copy == NULL) {
7159                 return NULL;
7160         }
7161         bcopy(template, copy, size);
7162
7163         for (i = 0; copy[i].ipft_name; i++) {
7164                 copy[i].ipft_una.ipftp_offset += (u_long)base;
7165                 copy[i].ipft_next = copy + i + 1;
7166         }
7167
7168         return copy;
7169 }
7170
7171
7172 /* ------------------------------------------------------------------------ */
7173 /* Function:    ipf_tune_add                                                */
7174 /* Returns:     int - 0 == success, else failure                            */
7175 /* Parameters:  newtune - pointer to new tune entry to add to tuneables     */
7176 /*                                                                          */
7177 /* Appends tune structures from the array passed in (newtune) to the end of */
7178 /* the current list of "dynamic" tuneable parameters.  Once added, the      */
7179 /* owner of the object is not expected to ever change "ipft_next".          */
7180 /* ------------------------------------------------------------------------ */
7181 int
7182 ipf_tune_add(softc, newtune)
7183         ipf_main_softc_t *softc;
7184         ipftuneable_t *newtune;
7185 {
7186         ipftuneable_t *ta, **tap;
7187
7188         ta = ipf_tune_findbyname(softc->ipf_tuners, newtune->ipft_name);
7189         if (ta != NULL) {
7190                 IPFERROR(74);
7191                 return EEXIST;
7192         }
7193
7194         for (tap = &softc->ipf_tuners; *tap != NULL; tap = &(*tap)->ipft_next)
7195                 ;
7196
7197         newtune->ipft_next = NULL;
7198         *tap = newtune;
7199         return 0;
7200 }
7201
7202
7203 /* ------------------------------------------------------------------------ */
7204 /* Function:    ipf_tune_del                                                */
7205 /* Returns:     int - 0 == success, else failure                            */
7206 /* Parameters:  oldtune - pointer to tune entry to remove from the list of  */
7207 /*                        current dynamic tuneables                         */
7208 /*                                                                          */
7209 /* Search for the tune structure, by pointer, in the list of those that are */
7210 /* dynamically added at run time.  If found, adjust the list so that this   */
7211 /* structure is no longer part of it.                                       */
7212 /* ------------------------------------------------------------------------ */
7213 int
7214 ipf_tune_del(softc, oldtune)
7215         ipf_main_softc_t *softc;
7216         ipftuneable_t *oldtune;
7217 {
7218         ipftuneable_t *ta, **tap;
7219         int error = 0;
7220
7221         for (tap = &softc->ipf_tuners; (ta = *tap) != NULL;
7222              tap = &ta->ipft_next) {
7223                 if (ta == oldtune) {
7224                         *tap = oldtune->ipft_next;
7225                         oldtune->ipft_next = NULL;
7226                         break;
7227                 }
7228         }
7229
7230         if (ta == NULL) {
7231                 error = ESRCH;
7232                 IPFERROR(75);
7233         }
7234         return error;
7235 }
7236
7237
7238 /* ------------------------------------------------------------------------ */
7239 /* Function:    ipf_tune_del_array                                          */
7240 /* Returns:     int - 0 == success, else failure                            */
7241 /* Parameters:  oldtune - pointer to tuneables array                        */
7242 /*                                                                          */
7243 /* Remove each tuneable entry in the array from the list of "dynamic"       */
7244 /* tunables.  If one entry should fail to be found, an error will be        */
7245 /* returned and no further ones removed.                                    */
7246 /* An entry with a NULL name is used as the indicator of the last entry in  */
7247 /* the array.                                                               */
7248 /* ------------------------------------------------------------------------ */
7249 int
7250 ipf_tune_del_array(softc, oldtune)
7251         ipf_main_softc_t *softc;
7252         ipftuneable_t *oldtune;
7253 {
7254         ipftuneable_t *ot;
7255         int error = 0;
7256
7257         for (ot = oldtune; ot->ipft_name != NULL; ot++) {
7258                 error = ipf_tune_del(softc, ot);
7259                 if (error != 0)
7260                         break;
7261         }
7262
7263         return error;
7264
7265 }
7266
7267
7268 /* ------------------------------------------------------------------------ */
7269 /* Function:    ipf_tune                                                    */
7270 /* Returns:     int - 0 == success, else failure                            */
7271 /* Parameters:  cmd(I)  - ioctl command number                              */
7272 /*              data(I) - pointer to ioctl data structure                   */
7273 /*                                                                          */
7274 /* Implement handling of SIOCIPFGETNEXT, SIOCIPFGET and SIOCIPFSET.  These  */
7275 /* three ioctls provide the means to access and control global variables    */
7276 /* within IPFilter, allowing (for example) timeouts and table sizes to be   */
7277 /* changed without rebooting, reloading or recompiling.  The initialisation */
7278 /* and 'destruction' routines of the various components of ipfilter are all */
7279 /* each responsible for handling their own values being too big.            */
7280 /* ------------------------------------------------------------------------ */
7281 int
7282 ipf_ipftune(softc, cmd, data)
7283         ipf_main_softc_t *softc;
7284         ioctlcmd_t cmd;
7285         void *data;
7286 {
7287         ipftuneable_t *ta;
7288         ipftune_t tu;
7289         void *cookie;
7290         int error;
7291
7292         error = ipf_inobj(softc, data, NULL, &tu, IPFOBJ_TUNEABLE);
7293         if (error != 0)
7294                 return error;
7295
7296         tu.ipft_name[sizeof(tu.ipft_name) - 1] = '\0';
7297         cookie = tu.ipft_cookie;
7298         ta = NULL;
7299
7300         switch (cmd)
7301         {
7302         case SIOCIPFGETNEXT :
7303                 /*
7304                  * If cookie is non-NULL, assume it to be a pointer to the last
7305                  * entry we looked at, so find it (if possible) and return a
7306                  * pointer to the next one after it.  The last entry in the
7307                  * the table is a NULL entry, so when we get to it, set cookie
7308                  * to NULL and return that, indicating end of list, erstwhile
7309                  * if we come in with cookie set to NULL, we are starting anew
7310                  * at the front of the list.
7311                  */
7312                 if (cookie != NULL) {
7313                         ta = ipf_tune_findbycookie(&softc->ipf_tuners,
7314                                                    cookie, &tu.ipft_cookie);
7315                 } else {
7316                         ta = softc->ipf_tuners;
7317                         tu.ipft_cookie = ta + 1;
7318                 }
7319                 if (ta != NULL) {
7320                         /*
7321                          * Entry found, but does the data pointed to by that
7322                          * row fit in what we can return?
7323                          */
7324                         if (ta->ipft_sz > sizeof(tu.ipft_un)) {
7325                                 IPFERROR(76);
7326                                 return EINVAL;
7327                         }
7328
7329                         tu.ipft_vlong = 0;
7330                         if (ta->ipft_sz == sizeof(u_long))
7331                                 tu.ipft_vlong = *ta->ipft_plong;
7332                         else if (ta->ipft_sz == sizeof(u_int))
7333                                 tu.ipft_vint = *ta->ipft_pint;
7334                         else if (ta->ipft_sz == sizeof(u_short))
7335                                 tu.ipft_vshort = *ta->ipft_pshort;
7336                         else if (ta->ipft_sz == sizeof(u_char))
7337                                 tu.ipft_vchar = *ta->ipft_pchar;
7338
7339                         tu.ipft_sz = ta->ipft_sz;
7340                         tu.ipft_min = ta->ipft_min;
7341                         tu.ipft_max = ta->ipft_max;
7342                         tu.ipft_flags = ta->ipft_flags;
7343                         bcopy(ta->ipft_name, tu.ipft_name,
7344                               MIN(sizeof(tu.ipft_name),
7345                                   strlen(ta->ipft_name) + 1));
7346                 }
7347                 error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7348                 break;
7349
7350         case SIOCIPFGET :
7351         case SIOCIPFSET :
7352                 /*
7353                  * Search by name or by cookie value for a particular entry
7354                  * in the tuning paramter table.
7355                  */
7356                 IPFERROR(77);
7357                 error = ESRCH;
7358                 if (cookie != NULL) {
7359                         ta = ipf_tune_findbycookie(&softc->ipf_tuners,
7360                                                    cookie, NULL);
7361                         if (ta != NULL)
7362                                 error = 0;
7363                 } else if (tu.ipft_name[0] != '\0') {
7364                         ta = ipf_tune_findbyname(softc->ipf_tuners,
7365                                                  tu.ipft_name);
7366                         if (ta != NULL)
7367                                 error = 0;
7368                 }
7369                 if (error != 0)
7370                         break;
7371
7372                 if (cmd == (ioctlcmd_t)SIOCIPFGET) {
7373                         /*
7374                          * Fetch the tuning parameters for a particular value
7375                          */
7376                         tu.ipft_vlong = 0;
7377                         if (ta->ipft_sz == sizeof(u_long))
7378                                 tu.ipft_vlong = *ta->ipft_plong;
7379                         else if (ta->ipft_sz == sizeof(u_int))
7380                                 tu.ipft_vint = *ta->ipft_pint;
7381                         else if (ta->ipft_sz == sizeof(u_short))
7382                                 tu.ipft_vshort = *ta->ipft_pshort;
7383                         else if (ta->ipft_sz == sizeof(u_char))
7384                                 tu.ipft_vchar = *ta->ipft_pchar;
7385                         tu.ipft_cookie = ta;
7386                         tu.ipft_sz = ta->ipft_sz;
7387                         tu.ipft_min = ta->ipft_min;
7388                         tu.ipft_max = ta->ipft_max;
7389                         tu.ipft_flags = ta->ipft_flags;
7390                         error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7391
7392                 } else if (cmd == (ioctlcmd_t)SIOCIPFSET) {
7393                         /*
7394                          * Set an internal parameter.  The hard part here is
7395                          * getting the new value safely and correctly out of
7396                          * the kernel (given we only know its size, not type.)
7397                          */
7398                         u_long in;
7399
7400                         if (((ta->ipft_flags & IPFT_WRDISABLED) != 0) &&
7401                             (softc->ipf_running > 0)) {
7402                                 IPFERROR(78);
7403                                 error = EBUSY;
7404                                 break;
7405                         }
7406
7407                         in = tu.ipft_vlong;
7408                         if (in < ta->ipft_min || in > ta->ipft_max) {
7409                                 IPFERROR(79);
7410                                 error = EINVAL;
7411                                 break;
7412                         }
7413
7414                         if (ta->ipft_func != NULL) {
7415                                 SPL_INT(s);
7416
7417                                 SPL_NET(s);
7418                                 error = (*ta->ipft_func)(softc, ta,
7419                                                          &tu.ipft_un);
7420                                 SPL_X(s);
7421
7422                         } else if (ta->ipft_sz == sizeof(u_long)) {
7423                                 tu.ipft_vlong = *ta->ipft_plong;
7424                                 *ta->ipft_plong = in;
7425
7426                         } else if (ta->ipft_sz == sizeof(u_int)) {
7427                                 tu.ipft_vint = *ta->ipft_pint;
7428                                 *ta->ipft_pint = (u_int)(in & 0xffffffff);
7429
7430                         } else if (ta->ipft_sz == sizeof(u_short)) {
7431                                 tu.ipft_vshort = *ta->ipft_pshort;
7432                                 *ta->ipft_pshort = (u_short)(in & 0xffff);
7433
7434                         } else if (ta->ipft_sz == sizeof(u_char)) {
7435                                 tu.ipft_vchar = *ta->ipft_pchar;
7436                                 *ta->ipft_pchar = (u_char)(in & 0xff);
7437                         }
7438                         error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7439                 }
7440                 break;
7441
7442         default :
7443                 IPFERROR(80);
7444                 error = EINVAL;
7445                 break;
7446         }
7447
7448         return error;
7449 }
7450
7451
7452 /* ------------------------------------------------------------------------ */
7453 /* Function:    ipf_zerostats                                               */
7454 /* Returns:     int - 0 = success, else failure                             */
7455 /* Parameters:  data(O) - pointer to pointer for copying data back to       */
7456 /*                                                                          */
7457 /* Copies the current statistics out to userspace and then zero's the       */
7458 /* current ones in the kernel. The lock is only held across the bzero() as  */
7459 /* the copyout may result in paging (ie network activity.)                  */
7460 /* ------------------------------------------------------------------------ */
7461 int
7462 ipf_zerostats(softc, data)
7463         ipf_main_softc_t *softc;
7464         caddr_t data;
7465 {
7466         friostat_t fio;
7467         ipfobj_t obj;
7468         int error;
7469
7470         error = ipf_inobj(softc, data, &obj, &fio, IPFOBJ_IPFSTAT);
7471         if (error != 0)
7472                 return error;
7473         ipf_getstat(softc, &fio, obj.ipfo_rev);
7474         error = ipf_outobj(softc, data, &fio, IPFOBJ_IPFSTAT);
7475         if (error != 0)
7476                 return error;
7477
7478         WRITE_ENTER(&softc->ipf_mutex);
7479         bzero(&softc->ipf_stats, sizeof(softc->ipf_stats));
7480         RWLOCK_EXIT(&softc->ipf_mutex);
7481
7482         return 0;
7483 }
7484
7485
7486 /* ------------------------------------------------------------------------ */
7487 /* Function:    ipf_resolvedest                                             */
7488 /* Returns:     Nil                                                         */
7489 /* Parameters:  softc(I) - pointer to soft context main structure           */
7490 /*              base(I)  - where strings are stored                         */
7491 /*              fdp(IO)  - pointer to destination information to resolve    */
7492 /*              v(I)     - IP protocol version to match                     */
7493 /*                                                                          */
7494 /* Looks up an interface name in the frdest structure pointed to by fdp and */
7495 /* if a matching name can be found for the particular IP protocol version   */
7496 /* then store the interface pointer in the frdest struct.  If no match is   */
7497 /* found, then set the interface pointer to be -1 as NULL is considered to  */
7498 /* indicate there is no information at all in the structure.                */
7499 /* ------------------------------------------------------------------------ */
7500 int
7501 ipf_resolvedest(softc, base, fdp, v)
7502         ipf_main_softc_t *softc;
7503         char *base;
7504         frdest_t *fdp;
7505         int v;
7506 {
7507         int errval = 0;
7508         void *ifp;
7509
7510         ifp = NULL;
7511
7512         if (fdp->fd_name != -1) {
7513                 if (fdp->fd_type == FRD_DSTLIST) {
7514                         ifp = ipf_lookup_res_name(softc, IPL_LOGIPF,
7515                                                   IPLT_DSTLIST,
7516                                                   base + fdp->fd_name,
7517                                                   NULL);
7518                         if (ifp == NULL) {
7519                                 IPFERROR(144);
7520                                 errval = ESRCH;
7521                         }
7522                 } else {
7523                         ifp = GETIFP(base + fdp->fd_name, v);
7524                         if (ifp == NULL)
7525                                 ifp = (void *)-1;
7526                 }
7527         }
7528         fdp->fd_ptr = ifp;
7529
7530         if ((ifp != NULL) && (ifp != (void *)-1)) {
7531                 fdp->fd_local = ipf_deliverlocal(softc, v, ifp, &fdp->fd_ip6);
7532         }
7533
7534         return errval;
7535 }
7536
7537
7538 /* ------------------------------------------------------------------------ */
7539 /* Function:    ipf_resolvenic                                              */
7540 /* Returns:     void* - NULL = wildcard name, -1 = failed to find NIC, else */
7541 /*                      pointer to interface structure for NIC              */
7542 /* Parameters:  softc(I)- pointer to soft context main structure            */
7543 /*              name(I) - complete interface name                           */
7544 /*              v(I)    - IP protocol version                               */
7545 /*                                                                          */
7546 /* Look for a network interface structure that firstly has a matching name  */
7547 /* to that passed in and that is also being used for that IP protocol       */
7548 /* version (necessary on some platforms where there are separate listings   */
7549 /* for both IPv4 and IPv6 on the same physical NIC.                         */
7550 /* ------------------------------------------------------------------------ */
7551 void *
7552 ipf_resolvenic(softc, name, v)
7553         ipf_main_softc_t *softc;
7554         char *name;
7555         int v;
7556 {
7557         void *nic;
7558
7559         softc = softc;  /* gcc -Wextra */
7560         if (name[0] == '\0')
7561                 return NULL;
7562
7563         if ((name[1] == '\0') && ((name[0] == '-') || (name[0] == '*'))) {
7564                 return NULL;
7565         }
7566
7567         nic = GETIFP(name, v);
7568         if (nic == NULL)
7569                 nic = (void *)-1;
7570         return nic;
7571 }
7572
7573
7574 /* ------------------------------------------------------------------------ */
7575 /* Function:    ipf_token_expire                                            */
7576 /* Returns:     None.                                                       */
7577 /* Parameters:  softc(I) - pointer to soft context main structure           */
7578 /*                                                                          */
7579 /* This function is run every ipf tick to see if there are any tokens that  */
7580 /* have been held for too long and need to be freed up.                     */
7581 /* ------------------------------------------------------------------------ */
7582 void
7583 ipf_token_expire(softc)
7584         ipf_main_softc_t *softc;
7585 {
7586         ipftoken_t *it;
7587
7588         WRITE_ENTER(&softc->ipf_tokens);
7589         while ((it = softc->ipf_token_head) != NULL) {
7590                 if (it->ipt_die > softc->ipf_ticks)
7591                         break;
7592
7593                 ipf_token_deref(softc, it);
7594         }
7595         RWLOCK_EXIT(&softc->ipf_tokens);
7596 }
7597
7598
7599 /* ------------------------------------------------------------------------ */
7600 /* Function:    ipf_token_flush                                             */
7601 /* Returns:     None.                                                       */
7602 /* Parameters:  softc(I) - pointer to soft context main structure           */
7603 /*                                                                          */
7604 /* Loop through all of the existing tokens and call deref to see if they    */
7605 /* can be freed. Normally a function like this might just loop on           */
7606 /* ipf_token_head but there is a chance that a token might have a ref count */
7607 /* of greater than one and in that case the the reference would drop twice  */
7608 /* by code that is only entitled to drop it once.                           */
7609 /* ------------------------------------------------------------------------ */
7610 static void
7611 ipf_token_flush(softc)
7612         ipf_main_softc_t *softc;
7613 {
7614         ipftoken_t *it, *next;
7615
7616         WRITE_ENTER(&softc->ipf_tokens);
7617         for (it = softc->ipf_token_head; it != NULL; it = next) {
7618                 next = it->ipt_next;
7619                 (void) ipf_token_deref(softc, it);
7620         }
7621         RWLOCK_EXIT(&softc->ipf_tokens);
7622 }
7623
7624
7625 /* ------------------------------------------------------------------------ */
7626 /* Function:    ipf_token_del                                               */
7627 /* Returns:     int     - 0 = success, else error                           */
7628 /* Parameters:  softc(I)- pointer to soft context main structure            */
7629 /*              type(I) - the token type to match                           */
7630 /*              uid(I)  - uid owning the token                              */
7631 /*              ptr(I)  - context pointer for the token                     */
7632 /*                                                                          */
7633 /* This function looks for a a token in the current list that matches up    */
7634 /* the fields (type, uid, ptr).  If none is found, ESRCH is returned, else  */
7635 /* call ipf_token_dewref() to remove it from the list. In the event that    */
7636 /* the token has a reference held elsewhere, setting ipt_complete to 2      */
7637 /* enables debugging to distinguish between the two paths that ultimately   */
7638 /* lead to a token to be deleted.                                           */
7639 /* ------------------------------------------------------------------------ */
7640 int
7641 ipf_token_del(softc, type, uid, ptr)
7642         ipf_main_softc_t *softc;
7643         int type, uid;
7644         void *ptr;
7645 {
7646         ipftoken_t *it;
7647         int error;
7648
7649         IPFERROR(82);
7650         error = ESRCH;
7651
7652         WRITE_ENTER(&softc->ipf_tokens);
7653         for (it = softc->ipf_token_head; it != NULL; it = it->ipt_next) {
7654                 if (ptr == it->ipt_ctx && type == it->ipt_type &&
7655                     uid == it->ipt_uid) {
7656                         it->ipt_complete = 2;
7657                         ipf_token_deref(softc, it);
7658                         error = 0;
7659                         break;
7660                 }
7661         }
7662         RWLOCK_EXIT(&softc->ipf_tokens);
7663
7664         return error;
7665 }
7666
7667
7668 /* ------------------------------------------------------------------------ */
7669 /* Function:    ipf_token_mark_complete                                     */
7670 /* Returns:     None.                                                       */
7671 /* Parameters:  token(I) - pointer to token structure                       */
7672 /*                                                                          */
7673 /* Mark a token as being ineligable for being found with ipf_token_find.    */
7674 /* ------------------------------------------------------------------------ */
7675 void
7676 ipf_token_mark_complete(token)
7677         ipftoken_t *token;
7678 {
7679         if (token->ipt_complete == 0)
7680                 token->ipt_complete = 1;
7681 }
7682
7683
7684 /* ------------------------------------------------------------------------ */
7685 /* Function:    ipf_token_find                                               */
7686 /* Returns:     ipftoken_t * - NULL if no memory, else pointer to token     */
7687 /* Parameters:  softc(I)- pointer to soft context main structure            */
7688 /*              type(I) - the token type to match                           */
7689 /*              uid(I)  - uid owning the token                              */
7690 /*              ptr(I)  - context pointer for the token                     */
7691 /*                                                                          */
7692 /* This function looks for a live token in the list of current tokens that  */
7693 /* matches the tuple (type, uid, ptr).  If one cannot be found then one is  */
7694 /* allocated.  If one is found then it is moved to the top of the list of   */
7695 /* currently active tokens.                                                 */
7696 /* ------------------------------------------------------------------------ */
7697 ipftoken_t *
7698 ipf_token_find(softc, type, uid, ptr)
7699         ipf_main_softc_t *softc;
7700         int type, uid;
7701         void *ptr;
7702 {
7703         ipftoken_t *it, *new;
7704
7705         KMALLOC(new, ipftoken_t *);
7706         if (new != NULL)
7707                 bzero((char *)new, sizeof(*new));
7708
7709         WRITE_ENTER(&softc->ipf_tokens);
7710         for (it = softc->ipf_token_head; it != NULL; it = it->ipt_next) {
7711                 if ((ptr == it->ipt_ctx) && (type == it->ipt_type) &&
7712                     (uid == it->ipt_uid) && (it->ipt_complete < 2))
7713                         break;
7714         }
7715
7716         if (it == NULL) {
7717                 it = new;
7718                 new = NULL;
7719                 if (it == NULL) {
7720                         RWLOCK_EXIT(&softc->ipf_tokens);
7721                         return NULL;
7722                 }
7723                 it->ipt_ctx = ptr;
7724                 it->ipt_uid = uid;
7725                 it->ipt_type = type;
7726                 it->ipt_ref = 1;
7727         } else {
7728                 if (new != NULL) {
7729                         KFREE(new);
7730                         new = NULL;
7731                 }
7732
7733                 if (it->ipt_complete > 0)
7734                         it = NULL;
7735                 else
7736                         ipf_token_unlink(softc, it);
7737         }
7738
7739         if (it != NULL) {
7740                 it->ipt_pnext = softc->ipf_token_tail;
7741                 *softc->ipf_token_tail = it;
7742                 softc->ipf_token_tail = &it->ipt_next;
7743                 it->ipt_next = NULL;
7744                 it->ipt_ref++;
7745
7746                 it->ipt_die = softc->ipf_ticks + 20;
7747         }
7748
7749         RWLOCK_EXIT(&softc->ipf_tokens);
7750
7751         return it;
7752 }
7753
7754
7755 /* ------------------------------------------------------------------------ */
7756 /* Function:    ipf_token_unlink                                            */
7757 /* Returns:     None.                                                       */
7758 /* Parameters:  softc(I) - pointer to soft context main structure           */
7759 /*              token(I) - pointer to token structure                       */
7760 /* Write Locks: ipf_tokens                                                  */
7761 /*                                                                          */
7762 /* This function unlinks a token structure from the linked list of tokens   */
7763 /* that "own" it.  The head pointer never needs to be explicitly adjusted   */
7764 /* but the tail does due to the linked list implementation.                 */
7765 /* ------------------------------------------------------------------------ */
7766 static void
7767 ipf_token_unlink(softc, token)
7768         ipf_main_softc_t *softc;
7769         ipftoken_t *token;
7770 {
7771
7772         if (softc->ipf_token_tail == &token->ipt_next)
7773                 softc->ipf_token_tail = token->ipt_pnext;
7774
7775         *token->ipt_pnext = token->ipt_next;
7776         if (token->ipt_next != NULL)
7777                 token->ipt_next->ipt_pnext = token->ipt_pnext;
7778         token->ipt_next = NULL;
7779         token->ipt_pnext = NULL;
7780 }
7781
7782
7783 /* ------------------------------------------------------------------------ */
7784 /* Function:    ipf_token_deref                                             */
7785 /* Returns:     int      - 0 == token freed, else reference count           */
7786 /* Parameters:  softc(I) - pointer to soft context main structure           */
7787 /*              token(I) - pointer to token structure                       */
7788 /* Write Locks: ipf_tokens                                                  */
7789 /*                                                                          */
7790 /* Drop the reference count on the token structure and if it drops to zero, */
7791 /* call the dereference function for the token type because it is then      */
7792 /* possible to free the token data structure.                               */
7793 /* ------------------------------------------------------------------------ */
7794 int
7795 ipf_token_deref(softc, token)
7796         ipf_main_softc_t *softc;
7797         ipftoken_t *token;
7798 {
7799         void *data, **datap;
7800
7801         ASSERT(token->ipt_ref > 0);
7802         token->ipt_ref--;
7803         if (token->ipt_ref > 0)
7804                 return token->ipt_ref;
7805
7806         data = token->ipt_data;
7807         datap = &data;
7808
7809         if ((data != NULL) && (data != (void *)-1)) {
7810                 switch (token->ipt_type)
7811                 {
7812                 case IPFGENITER_IPF :
7813                         (void) ipf_derefrule(softc, (frentry_t **)datap);
7814                         break;
7815                 case IPFGENITER_IPNAT :
7816                         WRITE_ENTER(&softc->ipf_nat);
7817                         ipf_nat_rule_deref(softc, (ipnat_t **)datap);
7818                         RWLOCK_EXIT(&softc->ipf_nat);
7819                         break;
7820                 case IPFGENITER_NAT :
7821                         ipf_nat_deref(softc, (nat_t **)datap);
7822                         break;
7823                 case IPFGENITER_STATE :
7824                         ipf_state_deref(softc, (ipstate_t **)datap);
7825                         break;
7826                 case IPFGENITER_FRAG :
7827                         ipf_frag_pkt_deref(softc, (ipfr_t **)datap);
7828                         break;
7829                 case IPFGENITER_NATFRAG :
7830                         ipf_frag_nat_deref(softc, (ipfr_t **)datap);
7831                         break;
7832                 case IPFGENITER_HOSTMAP :
7833                         WRITE_ENTER(&softc->ipf_nat);
7834                         ipf_nat_hostmapdel(softc, (hostmap_t **)datap);
7835                         RWLOCK_EXIT(&softc->ipf_nat);
7836                         break;
7837                 default :
7838                         ipf_lookup_iterderef(softc, token->ipt_type, data);
7839                         break;
7840                 }
7841         }
7842
7843         ipf_token_unlink(softc, token);
7844         KFREE(token);
7845         return 0;
7846 }
7847
7848
7849 /* ------------------------------------------------------------------------ */
7850 /* Function:    ipf_nextrule                                                */
7851 /* Returns:     frentry_t * - NULL == no more rules, else pointer to next   */
7852 /* Parameters:  softc(I)    - pointer to soft context main structure        */
7853 /*              fr(I)       - pointer to filter rule                        */
7854 /*              out(I)      - 1 == out rules, 0 == input rules              */
7855 /*                                                                          */
7856 /* Starting with "fr", find the next rule to visit. This includes visiting  */
7857 /* the list of rule groups if either fr is NULL (empty list) or it is the   */
7858 /* last rule in the list. When walking rule lists, it is either input or    */
7859 /* output rules that are returned, never both.                              */
7860 /* ------------------------------------------------------------------------ */
7861 static frentry_t *
7862 ipf_nextrule(softc, active, unit, fr, out)
7863         ipf_main_softc_t *softc;
7864         int active, unit;
7865         frentry_t *fr;
7866         int out;
7867 {
7868         frentry_t *next;
7869         frgroup_t *fg;
7870
7871         if (fr != NULL && fr->fr_group != -1) {
7872                 fg = ipf_findgroup(softc, fr->fr_names + fr->fr_group,
7873                                    unit, active, NULL);
7874                 if (fg != NULL)
7875                         fg = fg->fg_next;
7876         } else {
7877                 fg = softc->ipf_groups[unit][active];
7878         }
7879
7880         while (fg != NULL) {
7881                 next = fg->fg_start;
7882                 while (next != NULL) {
7883                         if (out) {
7884                                 if (next->fr_flags & FR_OUTQUE)
7885                                         return next;
7886                         } else if (next->fr_flags & FR_INQUE) {
7887                                 return next;
7888                         }
7889                         next = next->fr_next;
7890                 }
7891                 if (next == NULL)
7892                         fg = fg->fg_next;
7893         }
7894
7895         return NULL;
7896 }
7897
7898 /* ------------------------------------------------------------------------ */
7899 /* Function:    ipf_getnextrule                                             */
7900 /* Returns:     int - 0 = success, else error                               */
7901 /* Parameters:  softc(I)- pointer to soft context main structure            */
7902 /*              t(I)   - pointer to destination information to resolve      */
7903 /*              ptr(I) - pointer to ipfobj_t to copyin from user space      */
7904 /*                                                                          */
7905 /* This function's first job is to bring in the ipfruleiter_t structure via */
7906 /* the ipfobj_t structure to determine what should be the next rule to      */
7907 /* return. Once the ipfruleiter_t has been brought in, it then tries to     */
7908 /* find the 'next rule'.  This may include searching rule group lists or    */
7909 /* just be as simple as looking at the 'next' field in the rule structure.  */
7910 /* When we have found the rule to return, increase its reference count and  */
7911 /* if we used an existing rule to get here, decrease its reference count.   */
7912 /* ------------------------------------------------------------------------ */
7913 int
7914 ipf_getnextrule(softc, t, ptr)
7915         ipf_main_softc_t *softc;
7916         ipftoken_t *t;
7917         void *ptr;
7918 {
7919         frentry_t *fr, *next, zero;
7920         ipfruleiter_t it;
7921         int error, out;
7922         frgroup_t *fg;
7923         ipfobj_t obj;
7924         int predict;
7925         char *dst;
7926         int unit;
7927
7928         if (t == NULL || ptr == NULL) {
7929                 IPFERROR(84);
7930                 return EFAULT;
7931         }
7932
7933         error = ipf_inobj(softc, ptr, &obj, &it, IPFOBJ_IPFITER);
7934         if (error != 0)
7935                 return error;
7936
7937         if ((it.iri_inout < 0) || (it.iri_inout > 3)) {
7938                 IPFERROR(85);
7939                 return EINVAL;
7940         }
7941         if ((it.iri_active != 0) && (it.iri_active != 1)) {
7942                 IPFERROR(86);
7943                 return EINVAL;
7944         }
7945         if (it.iri_nrules == 0) {
7946                 IPFERROR(87);
7947                 return ENOSPC;
7948         }
7949         if (it.iri_rule == NULL) {
7950                 IPFERROR(88);
7951                 return EFAULT;
7952         }
7953
7954         fg = NULL;
7955         fr = t->ipt_data;
7956         if ((it.iri_inout & F_OUT) != 0)
7957                 out = 1;
7958         else
7959                 out = 0;
7960         if ((it.iri_inout & F_ACIN) != 0)
7961                 unit = IPL_LOGCOUNT;
7962         else
7963                 unit = IPL_LOGIPF;
7964
7965         READ_ENTER(&softc->ipf_mutex);
7966         if (fr == NULL) {
7967                 if (*it.iri_group == '\0') {
7968                         if (unit == IPL_LOGCOUNT) {
7969                                 next = softc->ipf_acct[out][it.iri_active];
7970                         } else {
7971                                 next = softc->ipf_rules[out][it.iri_active];
7972                         }
7973                         if (next == NULL)
7974                                 next = ipf_nextrule(softc, it.iri_active,
7975                                                     unit, NULL, out);
7976                 } else {
7977                         fg = ipf_findgroup(softc, it.iri_group, unit,
7978                                            it.iri_active, NULL);
7979                         if (fg != NULL)
7980                                 next = fg->fg_start;
7981                         else
7982                                 next = NULL;
7983                 }
7984         } else {
7985                 next = fr->fr_next;
7986                 if (next == NULL)
7987                         next = ipf_nextrule(softc, it.iri_active, unit,
7988                                             fr, out);
7989         }
7990
7991         if (next != NULL && next->fr_next != NULL)
7992                 predict = 1;
7993         else if (ipf_nextrule(softc, it.iri_active, unit, next, out) != NULL)
7994                 predict = 1;
7995         else
7996                 predict = 0;
7997
7998         if (fr != NULL)
7999                 (void) ipf_derefrule(softc, &fr);
8000
8001         obj.ipfo_type = IPFOBJ_FRENTRY;
8002         dst = (char *)it.iri_rule;
8003
8004         if (next != NULL) {
8005                 obj.ipfo_size = next->fr_size;
8006                 MUTEX_ENTER(&next->fr_lock);
8007                 next->fr_ref++;
8008                 MUTEX_EXIT(&next->fr_lock);
8009                 t->ipt_data = next;
8010         } else {
8011                 obj.ipfo_size = sizeof(frentry_t);
8012                 bzero(&zero, sizeof(zero));
8013                 next = &zero;
8014                 t->ipt_data = NULL;
8015         }
8016         it.iri_rule = predict ? next : NULL;
8017         if (predict == 0)
8018                 ipf_token_mark_complete(t);
8019
8020         RWLOCK_EXIT(&softc->ipf_mutex);
8021
8022         obj.ipfo_ptr = dst;
8023         error = ipf_outobjk(softc, &obj, next);
8024         if (error == 0 && t->ipt_data != NULL) {
8025                 dst += obj.ipfo_size;
8026                 if (next->fr_data != NULL) {
8027                         ipfobj_t dobj;
8028
8029                         if (next->fr_type == FR_T_IPFEXPR)
8030                                 dobj.ipfo_type = IPFOBJ_IPFEXPR;
8031                         else
8032                                 dobj.ipfo_type = IPFOBJ_FRIPF;
8033                         dobj.ipfo_size = next->fr_dsize;
8034                         dobj.ipfo_rev = obj.ipfo_rev;
8035                         dobj.ipfo_ptr = dst;
8036                         error = ipf_outobjk(softc, &dobj, next->fr_data);
8037                 }
8038         }
8039
8040         if ((fr != NULL) && (next == &zero))
8041                 (void) ipf_derefrule(softc, &fr);
8042
8043         return error;
8044 }
8045
8046
8047 /* ------------------------------------------------------------------------ */
8048 /* Function:    ipf_frruleiter                                              */
8049 /* Returns:     int - 0 = success, else error                               */
8050 /* Parameters:  softc(I)- pointer to soft context main structure            */
8051 /*              data(I) - the token type to match                           */
8052 /*              uid(I)  - uid owning the token                              */
8053 /*              ptr(I)  - context pointer for the token                     */
8054 /*                                                                          */
8055 /* This function serves as a stepping stone between ipf_ipf_ioctl and       */
8056 /* ipf_getnextrule.  It's role is to find the right token in the kernel for */
8057 /* the process doing the ioctl and use that to ask for the next rule.       */
8058 /* ------------------------------------------------------------------------ */
8059 static int
8060 ipf_frruleiter(softc, data, uid, ctx)
8061         ipf_main_softc_t *softc;
8062         void *data, *ctx;
8063         int uid;
8064 {
8065         ipftoken_t *token;
8066         ipfruleiter_t it;
8067         ipfobj_t obj;
8068         int error;
8069
8070         token = ipf_token_find(softc, IPFGENITER_IPF, uid, ctx);
8071         if (token != NULL) {
8072                 error = ipf_getnextrule(softc, token, data);
8073                 WRITE_ENTER(&softc->ipf_tokens);
8074                 ipf_token_deref(softc, token);
8075                 RWLOCK_EXIT(&softc->ipf_tokens);
8076         } else {
8077                 error = ipf_inobj(softc, data, &obj, &it, IPFOBJ_IPFITER);
8078                 if (error != 0)
8079                         return error;
8080                 it.iri_rule = NULL;
8081                 error = ipf_outobj(softc, data, &it, IPFOBJ_IPFITER);
8082         }
8083
8084         return error;
8085 }
8086
8087
8088 /* ------------------------------------------------------------------------ */
8089 /* Function:    ipf_geniter                                                 */
8090 /* Returns:     int - 0 = success, else error                               */
8091 /* Parameters:  softc(I) - pointer to soft context main structure           */
8092 /*              token(I) - pointer to ipftoken_t structure                  */
8093 /*              itp(I)   - pointer to iterator data                         */
8094 /*                                                                          */
8095 /* Decide which iterator function to call using information passed through  */
8096 /* the ipfgeniter_t structure at itp.                                       */
8097 /* ------------------------------------------------------------------------ */
8098 static int
8099 ipf_geniter(softc, token, itp)
8100         ipf_main_softc_t *softc;
8101         ipftoken_t *token;
8102         ipfgeniter_t *itp;
8103 {
8104         int error;
8105
8106         switch (itp->igi_type)
8107         {
8108         case IPFGENITER_FRAG :
8109                 error = ipf_frag_pkt_next(softc, token, itp);
8110                 break;
8111         default :
8112                 IPFERROR(92);
8113                 error = EINVAL;
8114                 break;
8115         }
8116
8117         return error;
8118 }
8119
8120
8121 /* ------------------------------------------------------------------------ */
8122 /* Function:    ipf_genericiter                                             */
8123 /* Returns:     int - 0 = success, else error                               */
8124 /* Parameters:  softc(I)- pointer to soft context main structure            */
8125 /*              data(I) - the token type to match                           */
8126 /*              uid(I)  - uid owning the token                              */
8127 /*              ptr(I)  - context pointer for the token                     */
8128 /*                                                                          */
8129 /* Handle the SIOCGENITER ioctl for the ipfilter device. The primary role   */
8130 /* ------------------------------------------------------------------------ */
8131 int
8132 ipf_genericiter(softc, data, uid, ctx)
8133         ipf_main_softc_t *softc;
8134         void *data, *ctx;
8135         int uid;
8136 {
8137         ipftoken_t *token;
8138         ipfgeniter_t iter;
8139         int error;
8140
8141         error = ipf_inobj(softc, data, NULL, &iter, IPFOBJ_GENITER);
8142         if (error != 0)
8143                 return error;
8144
8145         token = ipf_token_find(softc, iter.igi_type, uid, ctx);
8146         if (token != NULL) {
8147                 token->ipt_subtype = iter.igi_type;
8148                 error = ipf_geniter(softc, token, &iter);
8149                 WRITE_ENTER(&softc->ipf_tokens);
8150                 ipf_token_deref(softc, token);
8151                 RWLOCK_EXIT(&softc->ipf_tokens);
8152         } else {
8153                 IPFERROR(93);
8154                 error = 0;
8155         }
8156
8157         return error;
8158 }
8159
8160
8161 /* ------------------------------------------------------------------------ */
8162 /* Function:    ipf_ipf_ioctl                                               */
8163 /* Returns:     int - 0 = success, else error                               */
8164 /* Parameters:  softc(I)- pointer to soft context main structure           */
8165 /*              data(I) - the token type to match                           */
8166 /*              cmd(I)  - the ioctl command number                          */
8167 /*              mode(I) - mode flags for the ioctl                          */
8168 /*              uid(I)  - uid owning the token                              */
8169 /*              ptr(I)  - context pointer for the token                     */
8170 /*                                                                          */
8171 /* This function handles all of the ioctl command that are actually isssued */
8172 /* to the /dev/ipl device.                                                  */
8173 /* ------------------------------------------------------------------------ */
8174 int
8175 ipf_ipf_ioctl(softc, data, cmd, mode, uid, ctx)
8176         ipf_main_softc_t *softc;
8177         caddr_t data;
8178         ioctlcmd_t cmd;
8179         int mode, uid;
8180         void *ctx;
8181 {
8182         friostat_t fio;
8183         int error, tmp;
8184         ipfobj_t obj;
8185         SPL_INT(s);
8186
8187         switch (cmd)
8188         {
8189         case SIOCFRENB :
8190                 if (!(mode & FWRITE)) {
8191                         IPFERROR(94);
8192                         error = EPERM;
8193                 } else {
8194                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8195                         if (error != 0) {
8196                                 IPFERROR(95);
8197                                 error = EFAULT;
8198                                 break;
8199                         }
8200
8201                         WRITE_ENTER(&softc->ipf_global);
8202                         if (tmp) {
8203                                 if (softc->ipf_running > 0)
8204                                         error = 0;
8205                                 else
8206                                         error = ipfattach(softc);
8207                                 if (error == 0)
8208                                         softc->ipf_running = 1;
8209                                 else
8210                                         (void) ipfdetach(softc);
8211                         } else {
8212                                 if (softc->ipf_running == 1)
8213                                         error = ipfdetach(softc);
8214                                 else
8215                                         error = 0;
8216                                 if (error == 0)
8217                                         softc->ipf_running = -1;
8218                         }
8219                         RWLOCK_EXIT(&softc->ipf_global);
8220                 }
8221                 break;
8222
8223         case SIOCIPFSET :
8224                 if (!(mode & FWRITE)) {
8225                         IPFERROR(96);
8226                         error = EPERM;
8227                         break;
8228                 }
8229                 /* FALLTHRU */
8230         case SIOCIPFGETNEXT :
8231         case SIOCIPFGET :
8232                 error = ipf_ipftune(softc, cmd, (void *)data);
8233                 break;
8234
8235         case SIOCSETFF :
8236                 if (!(mode & FWRITE)) {
8237                         IPFERROR(97);
8238                         error = EPERM;
8239                 } else {
8240                         error = BCOPYIN(data, &softc->ipf_flags,
8241                                         sizeof(softc->ipf_flags));
8242                         if (error != 0) {
8243                                 IPFERROR(98);
8244                                 error = EFAULT;
8245                         }
8246                 }
8247                 break;
8248
8249         case SIOCGETFF :
8250                 error = BCOPYOUT(&softc->ipf_flags, data,
8251                                  sizeof(softc->ipf_flags));
8252                 if (error != 0) {
8253                         IPFERROR(99);
8254                         error = EFAULT;
8255                 }
8256                 break;
8257
8258         case SIOCFUNCL :
8259                 error = ipf_resolvefunc(softc, (void *)data);
8260                 break;
8261
8262         case SIOCINAFR :
8263         case SIOCRMAFR :
8264         case SIOCADAFR :
8265         case SIOCZRLST :
8266                 if (!(mode & FWRITE)) {
8267                         IPFERROR(100);
8268                         error = EPERM;
8269                 } else {
8270                         error = frrequest(softc, IPL_LOGIPF, cmd, (caddr_t)data,
8271                                           softc->ipf_active, 1);
8272                 }
8273                 break;
8274
8275         case SIOCINIFR :
8276         case SIOCRMIFR :
8277         case SIOCADIFR :
8278                 if (!(mode & FWRITE)) {
8279                         IPFERROR(101);
8280                         error = EPERM;
8281                 } else {
8282                         error = frrequest(softc, IPL_LOGIPF, cmd, (caddr_t)data,
8283                                           1 - softc->ipf_active, 1);
8284                 }
8285                 break;
8286
8287         case SIOCSWAPA :
8288                 if (!(mode & FWRITE)) {
8289                         IPFERROR(102);
8290                         error = EPERM;
8291                 } else {
8292                         WRITE_ENTER(&softc->ipf_mutex);
8293                         error = BCOPYOUT(&softc->ipf_active, data,
8294                                          sizeof(softc->ipf_active));
8295                         if (error != 0) {
8296                                 IPFERROR(103);
8297                                 error = EFAULT;
8298                         } else {
8299                                 softc->ipf_active = 1 - softc->ipf_active;
8300                         }
8301                         RWLOCK_EXIT(&softc->ipf_mutex);
8302                 }
8303                 break;
8304
8305         case SIOCGETFS :
8306                 error = ipf_inobj(softc, (void *)data, &obj, &fio,
8307                                   IPFOBJ_IPFSTAT);
8308                 if (error != 0)
8309                         break;
8310                 ipf_getstat(softc, &fio, obj.ipfo_rev);
8311                 error = ipf_outobj(softc, (void *)data, &fio, IPFOBJ_IPFSTAT);
8312                 break;
8313
8314         case SIOCFRZST :
8315                 if (!(mode & FWRITE)) {
8316                         IPFERROR(104);
8317                         error = EPERM;
8318                 } else
8319                         error = ipf_zerostats(softc, (caddr_t)data);
8320                 break;
8321
8322         case SIOCIPFFL :
8323                 if (!(mode & FWRITE)) {
8324                         IPFERROR(105);
8325                         error = EPERM;
8326                 } else {
8327                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8328                         if (!error) {
8329                                 tmp = ipf_flush(softc, IPL_LOGIPF, tmp);
8330                                 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8331                                 if (error != 0) {
8332                                         IPFERROR(106);
8333                                         error = EFAULT;
8334                                 }
8335                         } else {
8336                                 IPFERROR(107);
8337                                 error = EFAULT;
8338                         }
8339                 }
8340                 break;
8341
8342 #ifdef USE_INET6
8343         case SIOCIPFL6 :
8344                 if (!(mode & FWRITE)) {
8345                         IPFERROR(108);
8346                         error = EPERM;
8347                 } else {
8348                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8349                         if (!error) {
8350                                 tmp = ipf_flush(softc, IPL_LOGIPF, tmp);
8351                                 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8352                                 if (error != 0) {
8353                                         IPFERROR(109);
8354                                         error = EFAULT;
8355                                 }
8356                         } else {
8357                                 IPFERROR(110);
8358                                 error = EFAULT;
8359                         }
8360                 }
8361                 break;
8362 #endif
8363
8364         case SIOCSTLCK :
8365                 if (!(mode & FWRITE)) {
8366                         IPFERROR(122);
8367                         error = EPERM;
8368                 } else {
8369                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8370                         if (error == 0) {
8371                                 ipf_state_setlock(softc->ipf_state_soft, tmp);
8372                                 ipf_nat_setlock(softc->ipf_nat_soft, tmp);
8373                                 ipf_frag_setlock(softc->ipf_frag_soft, tmp);
8374                                 ipf_auth_setlock(softc->ipf_auth_soft, tmp);
8375                         } else {
8376                                 IPFERROR(111);
8377                                 error = EFAULT;
8378                         }
8379                 }
8380                 break;
8381
8382 #ifdef  IPFILTER_LOG
8383         case SIOCIPFFB :
8384                 if (!(mode & FWRITE)) {
8385                         IPFERROR(112);
8386                         error = EPERM;
8387                 } else {
8388                         tmp = ipf_log_clear(softc, IPL_LOGIPF);
8389                         error = BCOPYOUT(&tmp, data, sizeof(tmp));
8390                         if (error) {
8391                                 IPFERROR(113);
8392                                 error = EFAULT;
8393                         }
8394                 }
8395                 break;
8396 #endif /* IPFILTER_LOG */
8397
8398         case SIOCFRSYN :
8399                 if (!(mode & FWRITE)) {
8400                         IPFERROR(114);
8401                         error = EPERM;
8402                 } else {
8403                         WRITE_ENTER(&softc->ipf_global);
8404 #if (defined(MENTAT) && defined(_KERNEL)) && !defined(INSTANCES)
8405                         error = ipfsync();
8406 #else
8407                         ipf_sync(softc, NULL);
8408                         error = 0;
8409 #endif
8410                         RWLOCK_EXIT(&softc->ipf_global);
8411
8412                 }
8413                 break;
8414
8415         case SIOCGFRST :
8416                 error = ipf_outobj(softc, (void *)data,
8417                                    ipf_frag_stats(softc->ipf_frag_soft),
8418                                    IPFOBJ_FRAGSTAT);
8419                 break;
8420
8421 #ifdef  IPFILTER_LOG
8422         case FIONREAD :
8423                 tmp = ipf_log_bytesused(softc, IPL_LOGIPF);
8424                 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8425                 break;
8426 #endif
8427
8428         case SIOCIPFITER :
8429                 SPL_SCHED(s);
8430                 error = ipf_frruleiter(softc, data, uid, ctx);
8431                 SPL_X(s);
8432                 break;
8433
8434         case SIOCGENITER :
8435                 SPL_SCHED(s);
8436                 error = ipf_genericiter(softc, data, uid, ctx);
8437                 SPL_X(s);
8438                 break;
8439
8440         case SIOCIPFDELTOK :
8441                 error = BCOPYIN(data, &tmp, sizeof(tmp));
8442                 if (error == 0) {
8443                         SPL_SCHED(s);
8444                         error = ipf_token_del(softc, tmp, uid, ctx);
8445                         SPL_X(s);
8446                 }
8447                 break;
8448
8449         default :
8450                 IPFERROR(115);
8451                 error = EINVAL;
8452                 break;
8453         }
8454
8455         return error;
8456 }
8457
8458
8459 /* ------------------------------------------------------------------------ */
8460 /* Function:    ipf_decaps                                                  */
8461 /* Returns:     int        - -1 == decapsulation failed, else bit mask of   */
8462 /*                           flags indicating packet filtering decision.    */
8463 /* Parameters:  fin(I)     - pointer to packet information                  */
8464 /*              pass(I)    - IP protocol version to match                   */
8465 /*              l5proto(I) - layer 5 protocol to decode UDP data as.        */
8466 /*                                                                          */
8467 /* This function is called for packets that are wrapt up in other packets,  */
8468 /* for example, an IP packet that is the entire data segment for another IP */
8469 /* packet.  If the basic constraints for this are satisfied, change the     */
8470 /* buffer to point to the start of the inner packet and start processing    */
8471 /* rules belonging to the head group this rule specifies.                   */
8472 /* ------------------------------------------------------------------------ */
8473 u_32_t
8474 ipf_decaps(fin, pass, l5proto)
8475         fr_info_t *fin;
8476         u_32_t pass;
8477         int l5proto;
8478 {
8479         fr_info_t fin2, *fino = NULL;
8480         int elen, hlen, nh;
8481         grehdr_t gre;
8482         ip_t *ip;
8483         mb_t *m;
8484
8485         if ((fin->fin_flx & FI_COALESCE) == 0)
8486                 if (ipf_coalesce(fin) == -1)
8487                         goto cantdecaps;
8488
8489         m = fin->fin_m;
8490         hlen = fin->fin_hlen;
8491
8492         switch (fin->fin_p)
8493         {
8494         case IPPROTO_UDP :
8495                 /*
8496                  * In this case, the specific protocol being decapsulated
8497                  * inside UDP frames comes from the rule.
8498                  */
8499                 nh = fin->fin_fr->fr_icode;
8500                 break;
8501
8502         case IPPROTO_GRE :      /* 47 */
8503                 bcopy(fin->fin_dp, (char *)&gre, sizeof(gre));
8504                 hlen += sizeof(grehdr_t);
8505                 if (gre.gr_R|gre.gr_s)
8506                         goto cantdecaps;
8507                 if (gre.gr_C)
8508                         hlen += 4;
8509                 if (gre.gr_K)
8510                         hlen += 4;
8511                 if (gre.gr_S)
8512                         hlen += 4;
8513
8514                 nh = IPPROTO_IP;
8515
8516                 /*
8517                  * If the routing options flag is set, validate that it is
8518                  * there and bounce over it.
8519                  */
8520 #if 0
8521                 /* This is really heavy weight and lots of room for error, */
8522                 /* so for now, put it off and get the simple stuff right.  */
8523                 if (gre.gr_R) {
8524                         u_char off, len, *s;
8525                         u_short af;
8526                         int end;
8527
8528                         end = 0;
8529                         s = fin->fin_dp;
8530                         s += hlen;
8531                         aplen = fin->fin_plen - hlen;
8532                         while (aplen > 3) {
8533                                 af = (s[0] << 8) | s[1];
8534                                 off = s[2];
8535                                 len = s[3];
8536                                 aplen -= 4;
8537                                 s += 4;
8538                                 if (af == 0 && len == 0) {
8539                                         end = 1;
8540                                         break;
8541                                 }
8542                                 if (aplen < len)
8543                                         break;
8544                                 s += len;
8545                                 aplen -= len;
8546                         }
8547                         if (end != 1)
8548                                 goto cantdecaps;
8549                         hlen = s - (u_char *)fin->fin_dp;
8550                 }
8551 #endif
8552                 break;
8553
8554 #ifdef IPPROTO_IPIP
8555         case IPPROTO_IPIP :     /* 4 */
8556 #endif
8557                 nh = IPPROTO_IP;
8558                 break;
8559
8560         default :       /* Includes ESP, AH is special for IPv4 */
8561                 goto cantdecaps;
8562         }
8563
8564         switch (nh)
8565         {
8566         case IPPROTO_IP :
8567         case IPPROTO_IPV6 :
8568                 break;
8569         default :
8570                 goto cantdecaps;
8571         }
8572
8573         bcopy((char *)fin, (char *)&fin2, sizeof(fin2));
8574         fino = fin;
8575         fin = &fin2;
8576         elen = hlen;
8577 #if defined(MENTAT) && defined(_KERNEL)
8578         m->b_rptr += elen;
8579 #else
8580         m->m_data += elen;
8581         m->m_len -= elen;
8582 #endif
8583         fin->fin_plen -= elen;
8584
8585         ip = (ip_t *)((char *)fin->fin_ip + elen);
8586
8587         /*
8588          * Make sure we have at least enough data for the network layer
8589          * header.
8590          */
8591         if (IP_V(ip) == 4)
8592                 hlen = IP_HL(ip) << 2;
8593 #ifdef USE_INET6
8594         else if (IP_V(ip) == 6)
8595                 hlen = sizeof(ip6_t);
8596 #endif
8597         else
8598                 goto cantdecaps2;
8599
8600         if (fin->fin_plen < hlen)
8601                 goto cantdecaps2;
8602
8603         fin->fin_dp = (char *)ip + hlen;
8604
8605         if (IP_V(ip) == 4) {
8606                 /*
8607                  * Perform IPv4 header checksum validation.
8608                  */
8609                 if (ipf_cksum((u_short *)ip, hlen))
8610                         goto cantdecaps2;
8611         }
8612
8613         if (ipf_makefrip(hlen, ip, fin) == -1) {
8614 cantdecaps2:
8615                 if (m != NULL) {
8616 #if defined(MENTAT) && defined(_KERNEL)
8617                         m->b_rptr -= elen;
8618 #else
8619                         m->m_data -= elen;
8620                         m->m_len += elen;
8621 #endif
8622                 }
8623 cantdecaps:
8624                 DT1(frb_decapfrip, fr_info_t *, fin);
8625                 pass &= ~FR_CMDMASK;
8626                 pass |= FR_BLOCK|FR_QUICK;
8627                 fin->fin_reason = FRB_DECAPFRIP;
8628                 return -1;
8629         }
8630
8631         pass = ipf_scanlist(fin, pass);
8632
8633         /*
8634          * Copy the packet filter "result" fields out of the fr_info_t struct
8635          * that is local to the decapsulation processing and back into the
8636          * one we were called with.
8637          */
8638         fino->fin_flx = fin->fin_flx;
8639         fino->fin_rev = fin->fin_rev;
8640         fino->fin_icode = fin->fin_icode;
8641         fino->fin_rule = fin->fin_rule;
8642         (void) strncpy(fino->fin_group, fin->fin_group, FR_GROUPLEN);
8643         fino->fin_fr = fin->fin_fr;
8644         fino->fin_error = fin->fin_error;
8645         fino->fin_mp = fin->fin_mp;
8646         fino->fin_m = fin->fin_m;
8647         m = fin->fin_m;
8648         if (m != NULL) {
8649 #if defined(MENTAT) && defined(_KERNEL)
8650                 m->b_rptr -= elen;
8651 #else
8652                 m->m_data -= elen;
8653                 m->m_len += elen;
8654 #endif
8655         }
8656         return pass;
8657 }
8658
8659
8660 /* ------------------------------------------------------------------------ */
8661 /* Function:    ipf_matcharray_load                                         */
8662 /* Returns:     int         - 0 = success, else error                       */
8663 /* Parameters:  softc(I)    - pointer to soft context main structure        */
8664 /*              data(I)     - pointer to ioctl data                         */
8665 /*              objp(I)     - ipfobj_t structure to load data into          */
8666 /*              arrayptr(I) - pointer to location to store array pointer    */
8667 /*                                                                          */
8668 /* This function loads in a mathing array through the ipfobj_t struct that  */
8669 /* describes it.  Sanity checking and array size limitations are enforced   */
8670 /* in this function to prevent userspace from trying to load in something   */
8671 /* that is insanely big.  Once the size of the array is known, the memory   */
8672 /* required is malloc'd and returned through changing *arrayptr.  The       */
8673 /* contents of the array are verified before returning.  Only in the event  */
8674 /* of a successful call is the caller required to free up the malloc area.  */
8675 /* ------------------------------------------------------------------------ */
8676 int
8677 ipf_matcharray_load(softc, data, objp, arrayptr)
8678         ipf_main_softc_t *softc;
8679         caddr_t data;
8680         ipfobj_t *objp;
8681         int **arrayptr;
8682 {
8683         int arraysize, *array, error;
8684
8685         *arrayptr = NULL;
8686
8687         error = BCOPYIN(data, objp, sizeof(*objp));
8688         if (error != 0) {
8689                 IPFERROR(116);
8690                 return EFAULT;
8691         }
8692
8693         if (objp->ipfo_type != IPFOBJ_IPFEXPR) {
8694                 IPFERROR(117);
8695                 return EINVAL;
8696         }
8697
8698         if (((objp->ipfo_size & 3) != 0) || (objp->ipfo_size == 0) ||
8699             (objp->ipfo_size > 1024)) {
8700                 IPFERROR(118);
8701                 return EINVAL;
8702         }
8703
8704         arraysize = objp->ipfo_size * sizeof(*array);
8705         KMALLOCS(array, int *, arraysize);
8706         if (array == NULL) {
8707                 IPFERROR(119);
8708                 return ENOMEM;
8709         }
8710
8711         error = COPYIN(objp->ipfo_ptr, array, arraysize);
8712         if (error != 0) {
8713                 KFREES(array, arraysize);
8714                 IPFERROR(120);
8715                 return EFAULT;
8716         }
8717
8718         if (ipf_matcharray_verify(array, arraysize) != 0) {
8719                 KFREES(array, arraysize);
8720                 IPFERROR(121);
8721                 return EINVAL;
8722         }
8723
8724         *arrayptr = array;
8725         return 0;
8726 }
8727
8728
8729 /* ------------------------------------------------------------------------ */
8730 /* Function:    ipf_matcharray_verify                                       */
8731 /* Returns:     Nil                                                         */
8732 /* Parameters:  array(I)     - pointer to matching array                    */
8733 /*              arraysize(I) - number of elements in the array              */
8734 /*                                                                          */
8735 /* Verify the contents of a matching array by stepping through each element */
8736 /* in it.  The actual commands in the array are not verified for            */
8737 /* correctness, only that all of the sizes are correctly within limits.     */
8738 /* ------------------------------------------------------------------------ */
8739 int
8740 ipf_matcharray_verify(array, arraysize)
8741         int *array, arraysize;
8742 {
8743         int i, nelem, maxidx;
8744         ipfexp_t *e;
8745
8746         nelem = arraysize / sizeof(*array);
8747
8748         /*
8749          * Currently, it makes no sense to have an array less than 6
8750          * elements long - the initial size at the from, a single operation
8751          * (minimum 4 in length) and a trailer, for a total of 6.
8752          */
8753         if ((array[0] < 6) || (arraysize < 24) || (arraysize > 4096)) {
8754                 return -1;
8755         }
8756
8757         /*
8758          * Verify the size of data pointed to by array with how long
8759          * the array claims to be itself.
8760          */
8761         if (array[0] * sizeof(*array) != arraysize) {
8762                 return -1;
8763         }
8764
8765         maxidx = nelem - 1;
8766         /*
8767          * The last opcode in this array should be an IPF_EXP_END.
8768          */
8769         if (array[maxidx] != IPF_EXP_END) {
8770                 return -1;
8771         }
8772
8773         for (i = 1; i < maxidx; ) {
8774                 e = (ipfexp_t *)(array + i);
8775
8776                 /*
8777                  * The length of the bits to check must be at least 1
8778                  * (or else there is nothing to comapre with!) and it
8779                  * cannot exceed the length of the data present.
8780                  */
8781                 if ((e->ipfe_size < 1 ) ||
8782                     (e->ipfe_size + i > maxidx)) {
8783                         return -1;
8784                 }
8785                 i += e->ipfe_size;
8786         }
8787         return 0;
8788 }
8789
8790
8791 /* ------------------------------------------------------------------------ */
8792 /* Function:    ipf_fr_matcharray                                           */
8793 /* Returns:     int      - 0 = match failed, else positive match            */
8794 /* Parameters:  fin(I)   - pointer to packet information                    */
8795 /*              array(I) - pointer to matching array                        */
8796 /*                                                                          */
8797 /* This function is used to apply a matching array against a packet and     */
8798 /* return an indication of whether or not the packet successfully matches   */
8799 /* all of the commands in it.                                               */
8800 /* ------------------------------------------------------------------------ */
8801 static int
8802 ipf_fr_matcharray(fin, array)
8803         fr_info_t *fin;
8804         int *array;
8805 {
8806         int i, n, *x, rv, p;
8807         ipfexp_t *e;
8808
8809         rv = 0;
8810         n = array[0];
8811         x = array + 1;
8812
8813         for (; n > 0; x += 3 + x[3], rv = 0) {
8814                 e = (ipfexp_t *)x;
8815                 if (e->ipfe_cmd == IPF_EXP_END)
8816                         break;
8817                 n -= e->ipfe_size;
8818
8819                 /*
8820                  * The upper 16 bits currently store the protocol value.
8821                  * This is currently used with TCP and UDP port compares and
8822                  * allows "tcp.port = 80" without requiring an explicit
8823                  " "ip.pr = tcp" first.
8824                  */
8825                 p = e->ipfe_cmd >> 16;
8826                 if ((p != 0) && (p != fin->fin_p))
8827                         break;
8828
8829                 switch (e->ipfe_cmd)
8830                 {
8831                 case IPF_EXP_IP_PR :
8832                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8833                                 rv |= (fin->fin_p == e->ipfe_arg0[i]);
8834                         }
8835                         break;
8836
8837                 case IPF_EXP_IP_SRCADDR :
8838                         if (fin->fin_v != 4)
8839                                 break;
8840                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8841                                 rv |= ((fin->fin_saddr &
8842                                         e->ipfe_arg0[i * 2 + 1]) ==
8843                                        e->ipfe_arg0[i * 2]);
8844                         }
8845                         break;
8846
8847                 case IPF_EXP_IP_DSTADDR :
8848                         if (fin->fin_v != 4)
8849                                 break;
8850                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8851                                 rv |= ((fin->fin_daddr &
8852                                         e->ipfe_arg0[i * 2 + 1]) ==
8853                                        e->ipfe_arg0[i * 2]);
8854                         }
8855                         break;
8856
8857                 case IPF_EXP_IP_ADDR :
8858                         if (fin->fin_v != 4)
8859                                 break;
8860                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8861                                 rv |= ((fin->fin_saddr &
8862                                         e->ipfe_arg0[i * 2 + 1]) ==
8863                                        e->ipfe_arg0[i * 2]) ||
8864                                       ((fin->fin_daddr &
8865                                         e->ipfe_arg0[i * 2 + 1]) ==
8866                                        e->ipfe_arg0[i * 2]);
8867                         }
8868                         break;
8869
8870 #ifdef USE_INET6
8871                 case IPF_EXP_IP6_SRCADDR :
8872                         if (fin->fin_v != 6)
8873                                 break;
8874                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8875                                 rv |= IP6_MASKEQ(&fin->fin_src6,
8876                                                  &e->ipfe_arg0[i * 8 + 4],
8877                                                  &e->ipfe_arg0[i * 8]);
8878                         }
8879                         break;
8880
8881                 case IPF_EXP_IP6_DSTADDR :
8882                         if (fin->fin_v != 6)
8883                                 break;
8884                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8885                                 rv |= IP6_MASKEQ(&fin->fin_dst6,
8886                                                  &e->ipfe_arg0[i * 8 + 4],
8887                                                  &e->ipfe_arg0[i * 8]);
8888                         }
8889                         break;
8890
8891                 case IPF_EXP_IP6_ADDR :
8892                         if (fin->fin_v != 6)
8893                                 break;
8894                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8895                                 rv |= IP6_MASKEQ(&fin->fin_src6,
8896                                                  &e->ipfe_arg0[i * 8 + 4],
8897                                                  &e->ipfe_arg0[i * 8]) ||
8898                                       IP6_MASKEQ(&fin->fin_dst6,
8899                                                  &e->ipfe_arg0[i * 8 + 4],
8900                                                  &e->ipfe_arg0[i * 8]);
8901                         }
8902                         break;
8903 #endif
8904
8905                 case IPF_EXP_UDP_PORT :
8906                 case IPF_EXP_TCP_PORT :
8907                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8908                                 rv |= (fin->fin_sport == e->ipfe_arg0[i]) ||
8909                                       (fin->fin_dport == e->ipfe_arg0[i]);
8910                         }
8911                         break;
8912
8913                 case IPF_EXP_UDP_SPORT :
8914                 case IPF_EXP_TCP_SPORT :
8915                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8916                                 rv |= (fin->fin_sport == e->ipfe_arg0[i]);
8917                         }
8918                         break;
8919
8920                 case IPF_EXP_UDP_DPORT :
8921                 case IPF_EXP_TCP_DPORT :
8922                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8923                                 rv |= (fin->fin_dport == e->ipfe_arg0[i]);
8924                         }
8925                         break;
8926
8927                 case IPF_EXP_TCP_FLAGS :
8928                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8929                                 rv |= ((fin->fin_tcpf &
8930                                         e->ipfe_arg0[i * 2 + 1]) ==
8931                                        e->ipfe_arg0[i * 2]);
8932                         }
8933                         break;
8934                 }
8935                 rv ^= e->ipfe_not;
8936
8937                 if (rv == 0)
8938                         break;
8939         }
8940
8941         return rv;
8942 }
8943
8944
8945 /* ------------------------------------------------------------------------ */
8946 /* Function:    ipf_queueflush                                              */
8947 /* Returns:     int - number of entries flushed (0 = none)                  */
8948 /* Parameters:  softc(I)    - pointer to soft context main structure        */
8949 /*              deletefn(I) - function to call to delete entry              */
8950 /*              ipfqs(I)    - top of the list of ipf internal queues        */
8951 /*              userqs(I)   - top of the list of user defined timeouts      */
8952 /*                                                                          */
8953 /* This fucntion gets called when the state/NAT hash tables fill up and we  */
8954 /* need to try a bit harder to free up some space.  The algorithm used here */
8955 /* split into two parts but both halves have the same goal: to reduce the   */
8956 /* number of connections considered to be "active" to the low watermark.    */
8957 /* There are two steps in doing this:                                       */
8958 /* 1) Remove any TCP connections that are already considered to be "closed" */
8959 /*    but have not yet been removed from the state table.  The two states   */
8960 /*    TCPS_TIME_WAIT and TCPS_CLOSED are considered to be the perfect       */
8961 /*    candidates for this style of removal.  If freeing up entries in       */
8962 /*    CLOSED or both CLOSED and TIME_WAIT brings us to the low watermark,   */
8963 /*    we do not go on to step 2.                                            */
8964 /*                                                                          */
8965 /* 2) Look for the oldest entries on each timeout queue and free them if    */
8966 /*    they are within the given window we are considering.  Where the       */
8967 /*    window starts and the steps taken to increase its size depend upon    */
8968 /*    how long ipf has been running (ipf_ticks.)  Anything modified in the  */
8969 /*    last 30 seconds is not touched.                                       */
8970 /*                                              touched                     */
8971 /*         die     ipf_ticks  30*1.5    1800*1.5   |  43200*1.5             */
8972 /*           |          |        |           |     |     |                  */
8973 /* future <--+----------+--------+-----------+-----+-----+-----------> past */
8974 /*                     now        \_int=30s_/ \_int=1hr_/ \_int=12hr        */
8975 /*                                                                          */
8976 /* Points to note:                                                          */
8977 /* - tqe_die is the time, in the future, when entries die.                  */
8978 /* - tqe_die - ipf_ticks is how long left the connection has to live in ipf */
8979 /*   ticks.                                                                 */
8980 /* - tqe_touched is when the entry was last used by NAT/state               */
8981 /* - the closer tqe_touched is to ipf_ticks, the further tqe_die will be    */
8982 /*   ipf_ticks any given timeout queue and vice versa.                      */
8983 /* - both tqe_die and tqe_touched increase over time                        */
8984 /* - timeout queues are sorted with the highest value of tqe_die at the     */
8985 /*   bottom and therefore the smallest values of each are at the top        */
8986 /* - the pointer passed in as ipfqs should point to an array of timeout     */
8987 /*   queues representing each of the TCP states                             */
8988 /*                                                                          */
8989 /* We start by setting up a maximum range to scan for things to move of     */
8990 /* iend (newest) to istart (oldest) in chunks of "interval".  If nothing is */
8991 /* found in that range, "interval" is adjusted (so long as it isn't 30) and */
8992 /* we start again with a new value for "iend" and "istart".  This is        */
8993 /* continued until we either finish the scan of 30 second intervals or the  */
8994 /* low water mark is reached.                                               */
8995 /* ------------------------------------------------------------------------ */
8996 int
8997 ipf_queueflush(softc, deletefn, ipfqs, userqs, activep, size, low)
8998         ipf_main_softc_t *softc;
8999         ipftq_delete_fn_t deletefn;
9000         ipftq_t *ipfqs, *userqs;
9001         u_int *activep;
9002         int size, low;
9003 {
9004         u_long interval, istart, iend;
9005         ipftq_t *ifq, *ifqnext;
9006         ipftqent_t *tqe, *tqn;
9007         int removed = 0;
9008
9009         for (tqn = ipfqs[IPF_TCPS_CLOSED].ifq_head; ((tqe = tqn) != NULL); ) {
9010                 tqn = tqe->tqe_next;
9011                 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9012                         removed++;
9013         }
9014         if ((*activep * 100 / size) > low) {
9015                 for (tqn = ipfqs[IPF_TCPS_TIME_WAIT].ifq_head;
9016                      ((tqe = tqn) != NULL); ) {
9017                         tqn = tqe->tqe_next;
9018                         if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9019                                 removed++;
9020                 }
9021         }
9022
9023         if ((*activep * 100 / size) <= low) {
9024                 return removed;
9025         }
9026
9027         /*
9028          * NOTE: Use of "* 15 / 10" is required here because if "* 1.5" is
9029          *       used then the operations are upgraded to floating point
9030          *       and kernels don't like floating point...
9031          */
9032         if (softc->ipf_ticks > IPF_TTLVAL(43200 * 15 / 10)) {
9033                 istart = IPF_TTLVAL(86400 * 4);
9034                 interval = IPF_TTLVAL(43200);
9035         } else if (softc->ipf_ticks > IPF_TTLVAL(1800 * 15 / 10)) {
9036                 istart = IPF_TTLVAL(43200);
9037                 interval = IPF_TTLVAL(1800);
9038         } else if (softc->ipf_ticks > IPF_TTLVAL(30 * 15 / 10)) {
9039                 istart = IPF_TTLVAL(1800);
9040                 interval = IPF_TTLVAL(30);
9041         } else {
9042                 return 0;
9043         }
9044         if (istart > softc->ipf_ticks) {
9045                 if (softc->ipf_ticks - interval < interval)
9046                         istart = interval;
9047                 else
9048                         istart = (softc->ipf_ticks / interval) * interval;
9049         }
9050
9051         iend = softc->ipf_ticks - interval;
9052
9053         while ((*activep * 100 / size) > low) {
9054                 u_long try;
9055
9056                 try = softc->ipf_ticks - istart;
9057
9058                 for (ifq = ipfqs; ifq != NULL; ifq = ifq->ifq_next) {
9059                         for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); ) {
9060                                 if (try < tqe->tqe_touched)
9061                                         break;
9062                                 tqn = tqe->tqe_next;
9063                                 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9064                                         removed++;
9065                         }
9066                 }
9067
9068                 for (ifq = userqs; ifq != NULL; ifq = ifqnext) {
9069                         ifqnext = ifq->ifq_next;
9070
9071                         for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); ) {
9072                                 if (try < tqe->tqe_touched)
9073                                         break;
9074                                 tqn = tqe->tqe_next;
9075                                 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9076                                         removed++;
9077                         }
9078                 }
9079
9080                 if (try >= iend) {
9081                         if (interval == IPF_TTLVAL(43200)) {
9082                                 interval = IPF_TTLVAL(1800);
9083                         } else if (interval == IPF_TTLVAL(1800)) {
9084                                 interval = IPF_TTLVAL(30);
9085                         } else {
9086                                 break;
9087                         }
9088                         if (interval >= softc->ipf_ticks)
9089                                 break;
9090
9091                         iend = softc->ipf_ticks - interval;
9092                 }
9093                 istart -= interval;
9094         }
9095
9096         return removed;
9097 }
9098
9099
9100 /* ------------------------------------------------------------------------ */
9101 /* Function:    ipf_deliverlocal                                            */
9102 /* Returns:     int - 1 = local address, 0 = non-local address              */
9103 /* Parameters:  softc(I)     - pointer to soft context main structure       */
9104 /*              ipversion(I) - IP protocol version (4 or 6)                 */
9105 /*              ifp(I)       - network interface pointer                    */
9106 /*              ipaddr(I)    - IPv4/6 destination address                   */
9107 /*                                                                          */
9108 /* This fucntion is used to determine in the address "ipaddr" belongs to    */
9109 /* the network interface represented by ifp.                                */
9110 /* ------------------------------------------------------------------------ */
9111 int
9112 ipf_deliverlocal(softc, ipversion, ifp, ipaddr)
9113         ipf_main_softc_t *softc;
9114         int ipversion;
9115         void *ifp;
9116         i6addr_t *ipaddr;
9117 {
9118         i6addr_t addr;
9119         int islocal = 0;
9120
9121         if (ipversion == 4) {
9122                 if (ipf_ifpaddr(softc, 4, FRI_NORMAL, ifp, &addr, NULL) == 0) {
9123                         if (addr.in4.s_addr == ipaddr->in4.s_addr)
9124                                 islocal = 1;
9125                 }
9126
9127 #ifdef USE_INET6
9128         } else if (ipversion == 6) {
9129                 if (ipf_ifpaddr(softc, 6, FRI_NORMAL, ifp, &addr, NULL) == 0) {
9130                         if (IP6_EQ(&addr, ipaddr))
9131                                 islocal = 1;
9132                 }
9133 #endif
9134         }
9135
9136         return islocal;
9137 }
9138
9139
9140 /* ------------------------------------------------------------------------ */
9141 /* Function:    ipf_settimeout                                              */
9142 /* Returns:     int - 0 = success, -1 = failure                             */
9143 /* Parameters:  softc(I) - pointer to soft context main structure           */
9144 /*              t(I)     - pointer to tuneable array entry                  */
9145 /*              p(I)     - pointer to values passed in to apply             */
9146 /*                                                                          */
9147 /* This function is called to set the timeout values for each distinct      */
9148 /* queue timeout that is available.  When called, it calls into both the    */
9149 /* state and NAT code, telling them to update their timeout queues.         */
9150 /* ------------------------------------------------------------------------ */
9151 static int
9152 ipf_settimeout(softc, t, p)
9153         struct ipf_main_softc_s *softc;
9154         ipftuneable_t *t;
9155         ipftuneval_t *p;
9156 {
9157
9158         /*
9159          * ipf_interror should be set by the functions called here, not
9160          * by this function - it's just a middle man.
9161          */
9162         if (ipf_state_settimeout(softc, t, p) == -1)
9163                 return -1;
9164         if (ipf_nat_settimeout(softc, t, p) == -1)
9165                 return -1;
9166         return 0;
9167 }
9168
9169
9170 /* ------------------------------------------------------------------------ */
9171 /* Function:    ipf_apply_timeout                                           */
9172 /* Returns:     int - 0 = success, -1 = failure                             */
9173 /* Parameters:  head(I)    - pointer to tuneable array entry                */
9174 /*              seconds(I) - pointer to values passed in to apply           */
9175 /*                                                                          */
9176 /* This function applies a timeout of "seconds" to the timeout queue that   */
9177 /* is pointed to by "head".  All entries on this list have an expiration    */
9178 /* set to be the current tick value of ipf plus the ttl.  Given that this   */
9179 /* function should only be called when the delta is non-zero, the task is   */
9180 /* to walk the entire list and apply the change.  The sort order will not   */
9181 /* change.  The only catch is that this is O(n) across the list, so if the  */
9182 /* queue has lots of entries (10s of thousands or 100s of thousands), it    */
9183 /* could take a relatively long time to work through them all.              */
9184 /* ------------------------------------------------------------------------ */
9185 void
9186 ipf_apply_timeout(head, seconds)
9187         ipftq_t *head;
9188         u_int seconds;
9189 {
9190         u_int oldtimeout, newtimeout;
9191         ipftqent_t *tqe;
9192         int delta;
9193
9194         MUTEX_ENTER(&head->ifq_lock);
9195         oldtimeout = head->ifq_ttl;
9196         newtimeout = IPF_TTLVAL(seconds);
9197         delta = oldtimeout - newtimeout;
9198
9199         head->ifq_ttl = newtimeout;
9200
9201         for (tqe = head->ifq_head; tqe != NULL; tqe = tqe->tqe_next) {
9202                 tqe->tqe_die += delta;
9203         }
9204         MUTEX_EXIT(&head->ifq_lock);
9205 }
9206
9207
9208 /* ------------------------------------------------------------------------ */
9209 /* Function:   ipf_settimeout_tcp                                           */
9210 /* Returns:    int - 0 = successfully applied, -1 = failed                  */
9211 /* Parameters: t(I)   - pointer to tuneable to change                       */
9212 /*             p(I)   - pointer to new timeout information                  */
9213 /*             tab(I) - pointer to table of TCP queues                      */
9214 /*                                                                          */
9215 /* This function applies the new timeout (p) to the TCP tunable (t) and     */
9216 /* updates all of the entries on the relevant timeout queue by calling      */
9217 /* ipf_apply_timeout().                                                     */
9218 /* ------------------------------------------------------------------------ */
9219 int
9220 ipf_settimeout_tcp(t, p, tab)
9221         ipftuneable_t *t;
9222         ipftuneval_t *p;
9223         ipftq_t *tab;
9224 {
9225         if (!strcmp(t->ipft_name, "tcp_idle_timeout") ||
9226             !strcmp(t->ipft_name, "tcp_established")) {
9227                 ipf_apply_timeout(&tab[IPF_TCPS_ESTABLISHED], p->ipftu_int);
9228         } else if (!strcmp(t->ipft_name, "tcp_close_wait")) {
9229                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSE_WAIT], p->ipftu_int);
9230         } else if (!strcmp(t->ipft_name, "tcp_last_ack")) {
9231                 ipf_apply_timeout(&tab[IPF_TCPS_LAST_ACK], p->ipftu_int);
9232         } else if (!strcmp(t->ipft_name, "tcp_timeout")) {
9233                 ipf_apply_timeout(&tab[IPF_TCPS_LISTEN], p->ipftu_int);
9234                 ipf_apply_timeout(&tab[IPF_TCPS_HALF_ESTAB], p->ipftu_int);
9235                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSING], p->ipftu_int);
9236         } else if (!strcmp(t->ipft_name, "tcp_listen")) {
9237                 ipf_apply_timeout(&tab[IPF_TCPS_LISTEN], p->ipftu_int);
9238         } else if (!strcmp(t->ipft_name, "tcp_half_established")) {
9239                 ipf_apply_timeout(&tab[IPF_TCPS_HALF_ESTAB], p->ipftu_int);
9240         } else if (!strcmp(t->ipft_name, "tcp_closing")) {
9241                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSING], p->ipftu_int);
9242         } else if (!strcmp(t->ipft_name, "tcp_syn_received")) {
9243                 ipf_apply_timeout(&tab[IPF_TCPS_SYN_RECEIVED], p->ipftu_int);
9244         } else if (!strcmp(t->ipft_name, "tcp_syn_sent")) {
9245                 ipf_apply_timeout(&tab[IPF_TCPS_SYN_SENT], p->ipftu_int);
9246         } else if (!strcmp(t->ipft_name, "tcp_closed")) {
9247                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSED], p->ipftu_int);
9248         } else if (!strcmp(t->ipft_name, "tcp_half_closed")) {
9249                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSED], p->ipftu_int);
9250         } else if (!strcmp(t->ipft_name, "tcp_time_wait")) {
9251                 ipf_apply_timeout(&tab[IPF_TCPS_TIME_WAIT], p->ipftu_int);
9252         } else {
9253                 /*
9254                  * ipf_interror isn't set here because it should be set
9255                  * by whatever called this function.
9256                  */
9257                 return -1;
9258         }
9259         return 0;
9260 }
9261
9262
9263 /* ------------------------------------------------------------------------ */
9264 /* Function:   ipf_main_soft_create                                         */
9265 /* Returns:    NULL = failure, else success                                 */
9266 /* Parameters: arg(I) - pointer to soft context structure if already allocd */
9267 /*                                                                          */
9268 /* Create the foundation soft context structure. In circumstances where it  */
9269 /* is not required to dynamically allocate the context, a pointer can be    */
9270 /* passed in (rather than NULL) to a structure to be initialised.           */
9271 /* The main thing of interest is that a number of locks are initialised     */
9272 /* here instead of in the where might be expected - in the relevant create  */
9273 /* function elsewhere.  This is done because the current locking design has */
9274 /* some areas where these locks are used outside of their module.           */
9275 /* Possibly the most important exercise that is done here is setting of all */
9276 /* the timeout values, allowing them to be changed before init().           */
9277 /* ------------------------------------------------------------------------ */
9278 void *
9279 ipf_main_soft_create(arg)
9280         void *arg;
9281 {
9282         ipf_main_softc_t *softc;
9283
9284         if (arg == NULL) {
9285                 KMALLOC(softc, ipf_main_softc_t *);
9286                 if (softc == NULL)
9287                         return NULL;
9288         } else {
9289                 softc = arg;
9290         }
9291
9292         bzero((char *)softc, sizeof(*softc));
9293
9294         /*
9295          * This serves as a flag as to whether or not the softc should be
9296          * free'd when _destroy is called.
9297          */
9298         softc->ipf_dynamic_softc = (arg == NULL) ? 1 : 0;
9299
9300         softc->ipf_tuners = ipf_tune_array_copy(softc,
9301                                                 sizeof(ipf_main_tuneables),
9302                                                 ipf_main_tuneables);
9303         if (softc->ipf_tuners == NULL) {
9304                 ipf_main_soft_destroy(softc);
9305                 return NULL;
9306         }
9307
9308         MUTEX_INIT(&softc->ipf_rw, "ipf rw mutex");
9309         MUTEX_INIT(&softc->ipf_timeoutlock, "ipf timeout lock");
9310         RWLOCK_INIT(&softc->ipf_global, "ipf filter load/unload mutex");
9311         RWLOCK_INIT(&softc->ipf_mutex, "ipf filter rwlock");
9312         RWLOCK_INIT(&softc->ipf_tokens, "ipf token rwlock");
9313         RWLOCK_INIT(&softc->ipf_state, "ipf state rwlock");
9314         RWLOCK_INIT(&softc->ipf_nat, "ipf IP NAT rwlock");
9315         RWLOCK_INIT(&softc->ipf_poolrw, "ipf pool rwlock");
9316         RWLOCK_INIT(&softc->ipf_frag, "ipf frag rwlock");
9317
9318         softc->ipf_token_head = NULL;
9319         softc->ipf_token_tail = &softc->ipf_token_head;
9320
9321         softc->ipf_tcpidletimeout = FIVE_DAYS;
9322         softc->ipf_tcpclosewait = IPF_TTLVAL(2 * TCP_MSL);
9323         softc->ipf_tcplastack = IPF_TTLVAL(30);
9324         softc->ipf_tcptimewait = IPF_TTLVAL(2 * TCP_MSL);
9325         softc->ipf_tcptimeout = IPF_TTLVAL(2 * TCP_MSL);
9326         softc->ipf_tcpsynsent = IPF_TTLVAL(2 * TCP_MSL);
9327         softc->ipf_tcpsynrecv = IPF_TTLVAL(2 * TCP_MSL);
9328         softc->ipf_tcpclosed = IPF_TTLVAL(30);
9329         softc->ipf_tcphalfclosed = IPF_TTLVAL(2 * 3600);
9330         softc->ipf_udptimeout = IPF_TTLVAL(120);
9331         softc->ipf_udpacktimeout = IPF_TTLVAL(12);
9332         softc->ipf_icmptimeout = IPF_TTLVAL(60);
9333         softc->ipf_icmpacktimeout = IPF_TTLVAL(6);
9334         softc->ipf_iptimeout = IPF_TTLVAL(60);
9335
9336 #if defined(IPFILTER_DEFAULT_BLOCK)
9337         softc->ipf_pass = FR_BLOCK|FR_NOMATCH;
9338 #else
9339         softc->ipf_pass = (IPF_DEFAULT_PASS)|FR_NOMATCH;
9340 #endif
9341         softc->ipf_minttl = 4;
9342         softc->ipf_icmpminfragmtu = 68;
9343         softc->ipf_flags = IPF_LOGGING;
9344
9345         return softc;
9346 }
9347
9348 /* ------------------------------------------------------------------------ */
9349 /* Function:   ipf_main_soft_init                                           */
9350 /* Returns:    0 = success, -1 = failure                                    */
9351 /* Parameters: softc(I) - pointer to soft context main structure            */
9352 /*                                                                          */
9353 /* A null-op function that exists as a placeholder so that the flow in      */
9354 /* other functions is obvious.                                              */
9355 /* ------------------------------------------------------------------------ */
9356 /*ARGSUSED*/
9357 int
9358 ipf_main_soft_init(softc)
9359         ipf_main_softc_t *softc;
9360 {
9361         return 0;
9362 }
9363
9364
9365 /* ------------------------------------------------------------------------ */
9366 /* Function:   ipf_main_soft_destroy                                        */
9367 /* Returns:    void                                                         */
9368 /* Parameters: softc(I) - pointer to soft context main structure            */
9369 /*                                                                          */
9370 /* Undo everything that we did in ipf_main_soft_create.                     */
9371 /*                                                                          */
9372 /* The most important check that needs to be made here is whether or not    */
9373 /* the structure was allocated by ipf_main_soft_create() by checking what   */
9374 /* value is stored in ipf_dynamic_main.                                     */
9375 /* ------------------------------------------------------------------------ */
9376 /*ARGSUSED*/
9377 void
9378 ipf_main_soft_destroy(softc)
9379         ipf_main_softc_t *softc;
9380 {
9381
9382         RW_DESTROY(&softc->ipf_frag);
9383         RW_DESTROY(&softc->ipf_poolrw);
9384         RW_DESTROY(&softc->ipf_nat);
9385         RW_DESTROY(&softc->ipf_state);
9386         RW_DESTROY(&softc->ipf_tokens);
9387         RW_DESTROY(&softc->ipf_mutex);
9388         RW_DESTROY(&softc->ipf_global);
9389         MUTEX_DESTROY(&softc->ipf_timeoutlock);
9390         MUTEX_DESTROY(&softc->ipf_rw);
9391
9392         if (softc->ipf_tuners != NULL) {
9393                 KFREES(softc->ipf_tuners, sizeof(ipf_main_tuneables));
9394         }
9395         if (softc->ipf_dynamic_softc == 1) {
9396                 KFREE(softc);
9397         }
9398 }
9399
9400
9401 /* ------------------------------------------------------------------------ */
9402 /* Function:   ipf_main_soft_fini                                           */
9403 /* Returns:    0 = success, -1 = failure                                    */
9404 /* Parameters: softc(I) - pointer to soft context main structure            */
9405 /*                                                                          */
9406 /* Clean out the rules which have been added since _init was last called,   */
9407 /* the only dynamic part of the mainline.                                   */
9408 /* ------------------------------------------------------------------------ */
9409 int
9410 ipf_main_soft_fini(softc)
9411         ipf_main_softc_t *softc;
9412 {
9413         (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
9414         (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE);
9415         (void) ipf_flush(softc, IPL_LOGCOUNT, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
9416         (void) ipf_flush(softc, IPL_LOGCOUNT, FR_INQUE|FR_OUTQUE);
9417
9418         return 0;
9419 }
9420
9421
9422 /* ------------------------------------------------------------------------ */
9423 /* Function:   ipf_main_load                                                */
9424 /* Returns:    0 = success, -1 = failure                                    */
9425 /* Parameters: none                                                         */
9426 /*                                                                          */
9427 /* Handle global initialisation that needs to be done for the base part of  */
9428 /* IPFilter. At present this just amounts to initialising some ICMP lookup  */
9429 /* arrays that get used by the state/NAT code.                              */
9430 /* ------------------------------------------------------------------------ */
9431 int
9432 ipf_main_load()
9433 {
9434         int i;
9435
9436         /* fill icmp reply type table */
9437         for (i = 0; i <= ICMP_MAXTYPE; i++)
9438                 icmpreplytype4[i] = -1;
9439         icmpreplytype4[ICMP_ECHO] = ICMP_ECHOREPLY;
9440         icmpreplytype4[ICMP_TSTAMP] = ICMP_TSTAMPREPLY;
9441         icmpreplytype4[ICMP_IREQ] = ICMP_IREQREPLY;
9442         icmpreplytype4[ICMP_MASKREQ] = ICMP_MASKREPLY;
9443
9444 #ifdef  USE_INET6
9445         /* fill icmp reply type table */
9446         for (i = 0; i <= ICMP6_MAXTYPE; i++)
9447                 icmpreplytype6[i] = -1;
9448         icmpreplytype6[ICMP6_ECHO_REQUEST] = ICMP6_ECHO_REPLY;
9449         icmpreplytype6[ICMP6_MEMBERSHIP_QUERY] = ICMP6_MEMBERSHIP_REPORT;
9450         icmpreplytype6[ICMP6_NI_QUERY] = ICMP6_NI_REPLY;
9451         icmpreplytype6[ND_ROUTER_SOLICIT] = ND_ROUTER_ADVERT;
9452         icmpreplytype6[ND_NEIGHBOR_SOLICIT] = ND_NEIGHBOR_ADVERT;
9453 #endif
9454
9455         return 0;
9456 }
9457
9458
9459 /* ------------------------------------------------------------------------ */
9460 /* Function:   ipf_main_unload                                              */
9461 /* Returns:    0 = success, -1 = failure                                    */
9462 /* Parameters: none                                                         */
9463 /*                                                                          */
9464 /* A null-op function that exists as a placeholder so that the flow in      */
9465 /* other functions is obvious.                                              */
9466 /* ------------------------------------------------------------------------ */
9467 int
9468 ipf_main_unload()
9469 {
9470         return 0;
9471 }
9472
9473
9474 /* ------------------------------------------------------------------------ */
9475 /* Function:   ipf_load_all                                                 */
9476 /* Returns:    0 = success, -1 = failure                                    */
9477 /* Parameters: none                                                         */
9478 /*                                                                          */
9479 /* Work through all of the subsystems inside IPFilter and call the load     */
9480 /* function for each in an order that won't lead to a crash :)              */
9481 /* ------------------------------------------------------------------------ */
9482 int
9483 ipf_load_all()
9484 {
9485         if (ipf_main_load() == -1)
9486                 return -1;
9487
9488         if (ipf_state_main_load() == -1)
9489                 return -1;
9490
9491         if (ipf_nat_main_load() == -1)
9492                 return -1;
9493
9494         if (ipf_frag_main_load() == -1)
9495                 return -1;
9496
9497         if (ipf_auth_main_load() == -1)
9498                 return -1;
9499
9500         if (ipf_proxy_main_load() == -1)
9501                 return -1;
9502
9503         return 0;
9504 }
9505
9506
9507 /* ------------------------------------------------------------------------ */
9508 /* Function:   ipf_unload_all                                               */
9509 /* Returns:    0 = success, -1 = failure                                    */
9510 /* Parameters: none                                                         */
9511 /*                                                                          */
9512 /* Work through all of the subsystems inside IPFilter and call the unload   */
9513 /* function for each in an order that won't lead to a crash :)              */
9514 /* ------------------------------------------------------------------------ */
9515 int
9516 ipf_unload_all()
9517 {
9518         if (ipf_proxy_main_unload() == -1)
9519                 return -1;
9520
9521         if (ipf_auth_main_unload() == -1)
9522                 return -1;
9523
9524         if (ipf_frag_main_unload() == -1)
9525                 return -1;
9526
9527         if (ipf_nat_main_unload() == -1)
9528                 return -1;
9529
9530         if (ipf_state_main_unload() == -1)
9531                 return -1;
9532
9533         if (ipf_main_unload() == -1)
9534                 return -1;
9535
9536         return 0;
9537 }
9538
9539
9540 /* ------------------------------------------------------------------------ */
9541 /* Function:   ipf_create_all                                               */
9542 /* Returns:    NULL = failure, else success                                 */
9543 /* Parameters: arg(I) - pointer to soft context main structure              */
9544 /*                                                                          */
9545 /* Work through all of the subsystems inside IPFilter and call the create   */
9546 /* function for each in an order that won't lead to a crash :)              */
9547 /* ------------------------------------------------------------------------ */
9548 ipf_main_softc_t *
9549 ipf_create_all(arg)
9550         void *arg;
9551 {
9552         ipf_main_softc_t *softc;
9553
9554         softc = ipf_main_soft_create(arg);
9555         if (softc == NULL)
9556                 return NULL;
9557
9558 #ifdef IPFILTER_LOG
9559         softc->ipf_log_soft = ipf_log_soft_create(softc);
9560         if (softc->ipf_log_soft == NULL) {
9561                 ipf_destroy_all(softc);
9562                 return NULL;
9563         }
9564 #endif
9565
9566         softc->ipf_lookup_soft = ipf_lookup_soft_create(softc);
9567         if (softc->ipf_lookup_soft == NULL) {
9568                 ipf_destroy_all(softc);
9569                 return NULL;
9570         }
9571
9572         softc->ipf_sync_soft = ipf_sync_soft_create(softc);
9573         if (softc->ipf_sync_soft == NULL) {
9574                 ipf_destroy_all(softc);
9575                 return NULL;
9576         }
9577
9578         softc->ipf_state_soft = ipf_state_soft_create(softc);
9579         if (softc->ipf_state_soft == NULL) {
9580                 ipf_destroy_all(softc);
9581                 return NULL;
9582         }
9583
9584         softc->ipf_nat_soft = ipf_nat_soft_create(softc);
9585         if (softc->ipf_nat_soft == NULL) {
9586                 ipf_destroy_all(softc);
9587                 return NULL;
9588         }
9589
9590         softc->ipf_frag_soft = ipf_frag_soft_create(softc);
9591         if (softc->ipf_frag_soft == NULL) {
9592                 ipf_destroy_all(softc);
9593                 return NULL;
9594         }
9595
9596         softc->ipf_auth_soft = ipf_auth_soft_create(softc);
9597         if (softc->ipf_auth_soft == NULL) {
9598                 ipf_destroy_all(softc);
9599                 return NULL;
9600         }
9601
9602         softc->ipf_proxy_soft = ipf_proxy_soft_create(softc);
9603         if (softc->ipf_proxy_soft == NULL) {
9604                 ipf_destroy_all(softc);
9605                 return NULL;
9606         }
9607
9608         return softc;
9609 }
9610
9611
9612 /* ------------------------------------------------------------------------ */
9613 /* Function:   ipf_destroy_all                                              */
9614 /* Returns:    void                                                         */
9615 /* Parameters: softc(I) - pointer to soft context main structure            */
9616 /*                                                                          */
9617 /* Work through all of the subsystems inside IPFilter and call the destroy  */
9618 /* function for each in an order that won't lead to a crash :)              */
9619 /*                                                                          */
9620 /* Every one of these functions is expected to succeed, so there is no      */
9621 /* checking of return values.                                               */
9622 /* ------------------------------------------------------------------------ */
9623 void
9624 ipf_destroy_all(softc)
9625         ipf_main_softc_t *softc;
9626 {
9627
9628         if (softc->ipf_state_soft != NULL) {
9629                 ipf_state_soft_destroy(softc, softc->ipf_state_soft);
9630                 softc->ipf_state_soft = NULL;
9631         }
9632
9633         if (softc->ipf_nat_soft != NULL) {
9634                 ipf_nat_soft_destroy(softc, softc->ipf_nat_soft);
9635                 softc->ipf_nat_soft = NULL;
9636         }
9637
9638         if (softc->ipf_frag_soft != NULL) {
9639                 ipf_frag_soft_destroy(softc, softc->ipf_frag_soft);
9640                 softc->ipf_frag_soft = NULL;
9641         }
9642
9643         if (softc->ipf_auth_soft != NULL) {
9644                 ipf_auth_soft_destroy(softc, softc->ipf_auth_soft);
9645                 softc->ipf_auth_soft = NULL;
9646         }
9647
9648         if (softc->ipf_proxy_soft != NULL) {
9649                 ipf_proxy_soft_destroy(softc, softc->ipf_proxy_soft);
9650                 softc->ipf_proxy_soft = NULL;
9651         }
9652
9653         if (softc->ipf_sync_soft != NULL) {
9654                 ipf_sync_soft_destroy(softc, softc->ipf_sync_soft);
9655                 softc->ipf_sync_soft = NULL;
9656         }
9657
9658         if (softc->ipf_lookup_soft != NULL) {
9659                 ipf_lookup_soft_destroy(softc, softc->ipf_lookup_soft);
9660                 softc->ipf_lookup_soft = NULL;
9661         }
9662
9663 #ifdef IPFILTER_LOG
9664         if (softc->ipf_log_soft != NULL) {
9665                 ipf_log_soft_destroy(softc, softc->ipf_log_soft);
9666                 softc->ipf_log_soft = NULL;
9667         }
9668 #endif
9669
9670         ipf_main_soft_destroy(softc);
9671 }
9672
9673
9674 /* ------------------------------------------------------------------------ */
9675 /* Function:   ipf_init_all                                                 */
9676 /* Returns:    0 = success, -1 = failure                                    */
9677 /* Parameters: softc(I) - pointer to soft context main structure            */
9678 /*                                                                          */
9679 /* Work through all of the subsystems inside IPFilter and call the init     */
9680 /* function for each in an order that won't lead to a crash :)              */
9681 /* ------------------------------------------------------------------------ */
9682 int
9683 ipf_init_all(softc)
9684         ipf_main_softc_t *softc;
9685 {
9686
9687         if (ipf_main_soft_init(softc) == -1)
9688                 return -1;
9689
9690 #ifdef IPFILTER_LOG
9691         if (ipf_log_soft_init(softc, softc->ipf_log_soft) == -1)
9692                 return -1;
9693 #endif
9694
9695         if (ipf_lookup_soft_init(softc, softc->ipf_lookup_soft) == -1)
9696                 return -1;
9697
9698         if (ipf_sync_soft_init(softc, softc->ipf_sync_soft) == -1)
9699                 return -1;
9700
9701         if (ipf_state_soft_init(softc, softc->ipf_state_soft) == -1)
9702                 return -1;
9703
9704         if (ipf_nat_soft_init(softc, softc->ipf_nat_soft) == -1)
9705                 return -1;
9706
9707         if (ipf_frag_soft_init(softc, softc->ipf_frag_soft) == -1)
9708                 return -1;
9709
9710         if (ipf_auth_soft_init(softc, softc->ipf_auth_soft) == -1)
9711                 return -1;
9712
9713         if (ipf_proxy_soft_init(softc, softc->ipf_proxy_soft) == -1)
9714                 return -1;
9715
9716         return 0;
9717 }
9718
9719
9720 /* ------------------------------------------------------------------------ */
9721 /* Function:   ipf_fini_all                                                 */
9722 /* Returns:    0 = success, -1 = failure                                    */
9723 /* Parameters: softc(I) - pointer to soft context main structure            */
9724 /*                                                                          */
9725 /* Work through all of the subsystems inside IPFilter and call the fini     */
9726 /* function for each in an order that won't lead to a crash :)              */
9727 /* ------------------------------------------------------------------------ */
9728 int
9729 ipf_fini_all(softc)
9730         ipf_main_softc_t *softc;
9731 {
9732
9733         ipf_token_flush(softc);
9734
9735         if (ipf_proxy_soft_fini(softc, softc->ipf_proxy_soft) == -1)
9736                 return -1;
9737
9738         if (ipf_auth_soft_fini(softc, softc->ipf_auth_soft) == -1)
9739                 return -1;
9740
9741         if (ipf_frag_soft_fini(softc, softc->ipf_frag_soft) == -1)
9742                 return -1;
9743
9744         if (ipf_nat_soft_fini(softc, softc->ipf_nat_soft) == -1)
9745                 return -1;
9746
9747         if (ipf_state_soft_fini(softc, softc->ipf_state_soft) == -1)
9748                 return -1;
9749
9750         if (ipf_sync_soft_fini(softc, softc->ipf_sync_soft) == -1)
9751                 return -1;
9752
9753         if (ipf_lookup_soft_fini(softc, softc->ipf_lookup_soft) == -1)
9754                 return -1;
9755
9756 #ifdef IPFILTER_LOG
9757         if (ipf_log_soft_fini(softc, softc->ipf_log_soft) == -1)
9758                 return -1;
9759 #endif
9760
9761         if (ipf_main_soft_fini(softc) == -1)
9762                 return -1;
9763
9764         return 0;
9765 }
9766
9767
9768 /* ------------------------------------------------------------------------ */
9769 /* Function:    ipf_rule_expire                                             */
9770 /* Returns:     Nil                                                         */
9771 /* Parameters:  softc(I) - pointer to soft context main structure           */
9772 /*                                                                          */
9773 /* At present this function exists just to support temporary addition of    */
9774 /* firewall rules. Both inactive and active lists are scanned for items to  */
9775 /* purge, as by rights, the expiration is computed as soon as the rule is   */
9776 /* loaded in.                                                               */
9777 /* ------------------------------------------------------------------------ */
9778 void
9779 ipf_rule_expire(softc)
9780         ipf_main_softc_t *softc;
9781 {
9782         frentry_t *fr;
9783
9784         if ((softc->ipf_rule_explist[0] == NULL) &&
9785             (softc->ipf_rule_explist[1] == NULL))
9786                 return;
9787
9788         WRITE_ENTER(&softc->ipf_mutex);
9789
9790         while ((fr = softc->ipf_rule_explist[0]) != NULL) {
9791                 /*
9792                  * Because the list is kept sorted on insertion, the fist
9793                  * one that dies in the future means no more work to do.
9794                  */
9795                 if (fr->fr_die > softc->ipf_ticks)
9796                         break;
9797                 ipf_rule_delete(softc, fr, IPL_LOGIPF, 0);
9798         }
9799
9800         while ((fr = softc->ipf_rule_explist[1]) != NULL) {
9801                 /*
9802                  * Because the list is kept sorted on insertion, the fist
9803                  * one that dies in the future means no more work to do.
9804                  */
9805                 if (fr->fr_die > softc->ipf_ticks)
9806                         break;
9807                 ipf_rule_delete(softc, fr, IPL_LOGIPF, 1);
9808         }
9809
9810         RWLOCK_EXIT(&softc->ipf_mutex);
9811 }
9812
9813
9814 static int ipf_ht_node_cmp __P((struct host_node_s *, struct host_node_s *));
9815 static void ipf_ht_node_make_key __P((host_track_t *, host_node_t *, int,
9816                                       i6addr_t *));
9817
9818 host_node_t RBI_ZERO(ipf_rb);
9819 RBI_CODE(ipf_rb, host_node_t, hn_entry, ipf_ht_node_cmp)
9820
9821
9822 /* ------------------------------------------------------------------------ */
9823 /* Function:    ipf_ht_node_cmp                                             */
9824 /* Returns:     int   - 0 == nodes are the same, ..                         */
9825 /* Parameters:  k1(I) - pointer to first key to compare                     */
9826 /*              k2(I) - pointer to second key to compare                    */
9827 /*                                                                          */
9828 /* The "key" for the node is a combination of two fields: the address       */
9829 /* family and the address itself.                                           */
9830 /*                                                                          */
9831 /* Because we're not actually interpreting the address data, it isn't       */
9832 /* necessary to convert them to/from network/host byte order. The mask is   */
9833 /* just used to remove bits that aren't significant - it doesn't matter     */
9834 /* where they are, as long as they're always in the same place.             */
9835 /*                                                                          */
9836 /* As with IP6_EQ, comparing IPv6 addresses starts at the bottom because    */
9837 /* this is where individual ones will differ the most - but not true for    */
9838 /* for /48's, etc.                                                          */
9839 /* ------------------------------------------------------------------------ */
9840 static int
9841 ipf_ht_node_cmp(k1, k2)
9842         struct host_node_s *k1, *k2;
9843 {
9844         int i;
9845
9846         i = (k2->hn_addr.adf_family - k1->hn_addr.adf_family);
9847         if (i != 0)
9848                 return i;
9849
9850         if (k1->hn_addr.adf_family == AF_INET)
9851                 return (k2->hn_addr.adf_addr.in4.s_addr -
9852                         k1->hn_addr.adf_addr.in4.s_addr);
9853
9854         i = k2->hn_addr.adf_addr.i6[3] - k1->hn_addr.adf_addr.i6[3];
9855         if (i != 0)
9856                 return i;
9857         i = k2->hn_addr.adf_addr.i6[2] - k1->hn_addr.adf_addr.i6[2];
9858         if (i != 0)
9859                 return i;
9860         i = k2->hn_addr.adf_addr.i6[1] - k1->hn_addr.adf_addr.i6[1];
9861         if (i != 0)
9862                 return i;
9863         i = k2->hn_addr.adf_addr.i6[0] - k1->hn_addr.adf_addr.i6[0];
9864         return i;
9865 }
9866
9867
9868 /* ------------------------------------------------------------------------ */
9869 /* Function:    ipf_ht_node_make_key                                        */
9870 /* Returns:     Nil                                                         */
9871 /* parameters:  htp(I)    - pointer to address tracking structure           */
9872 /*              key(I)    - where to store masked address for lookup        */
9873 /*              family(I) - protocol family of address                      */
9874 /*              addr(I)   - pointer to network address                      */
9875 /*                                                                          */
9876 /* Using the "netmask" (number of bits) stored parent host tracking struct, */
9877 /* copy the address passed in into the key structure whilst masking out the */
9878 /* bits that we don't want.                                                 */
9879 /*                                                                          */
9880 /* Because the parser will set ht_netmask to 128 if there is no protocol    */
9881 /* specified (the parser doesn't know if it should be a v4 or v6 rule), we  */
9882 /* have to be wary of that and not allow 32-128 to happen.                  */
9883 /* ------------------------------------------------------------------------ */
9884 static void
9885 ipf_ht_node_make_key(htp, key, family, addr)
9886         host_track_t *htp;
9887         host_node_t *key;
9888         int family;
9889         i6addr_t *addr;
9890 {
9891         key->hn_addr.adf_family = family;
9892         if (family == AF_INET) {
9893                 u_32_t mask;
9894                 int bits;
9895
9896                 key->hn_addr.adf_len = sizeof(key->hn_addr.adf_addr.in4);
9897                 bits = htp->ht_netmask;
9898                 if (bits >= 32) {
9899                         mask = 0xffffffff;
9900                 } else {
9901                         mask = htonl(0xffffffff << (32 - bits));
9902                 }
9903                 key->hn_addr.adf_addr.in4.s_addr = addr->in4.s_addr & mask;
9904 #ifdef USE_INET6
9905         } else {
9906                 int bits = htp->ht_netmask;
9907
9908                 key->hn_addr.adf_len = sizeof(key->hn_addr.adf_addr.in6);
9909                 if (bits > 96) {
9910                         key->hn_addr.adf_addr.i6[3] = addr->i6[3] &
9911                                              htonl(0xffffffff << (128 - bits));
9912                         key->hn_addr.adf_addr.i6[2] = addr->i6[2];
9913                         key->hn_addr.adf_addr.i6[1] = addr->i6[2];
9914                         key->hn_addr.adf_addr.i6[0] = addr->i6[2];
9915                 } else if (bits > 64) {
9916                         key->hn_addr.adf_addr.i6[3] = 0;
9917                         key->hn_addr.adf_addr.i6[2] = addr->i6[2] &
9918                                              htonl(0xffffffff << (96 - bits));
9919                         key->hn_addr.adf_addr.i6[1] = addr->i6[1];
9920                         key->hn_addr.adf_addr.i6[0] = addr->i6[0];
9921                 } else if (bits > 32) {
9922                         key->hn_addr.adf_addr.i6[3] = 0;
9923                         key->hn_addr.adf_addr.i6[2] = 0;
9924                         key->hn_addr.adf_addr.i6[1] = addr->i6[1] &
9925                                              htonl(0xffffffff << (64 - bits));
9926                         key->hn_addr.adf_addr.i6[0] = addr->i6[0];
9927                 } else {
9928                         key->hn_addr.adf_addr.i6[3] = 0;
9929                         key->hn_addr.adf_addr.i6[2] = 0;
9930                         key->hn_addr.adf_addr.i6[1] = 0;
9931                         key->hn_addr.adf_addr.i6[0] = addr->i6[0] &
9932                                              htonl(0xffffffff << (32 - bits));
9933                 }
9934 #endif
9935         }
9936 }
9937
9938
9939 /* ------------------------------------------------------------------------ */
9940 /* Function:    ipf_ht_node_add                                             */
9941 /* Returns:     int       - 0 == success,  -1 == failure                    */
9942 /* Parameters:  softc(I)  - pointer to soft context main structure          */
9943 /*              htp(I)    - pointer to address tracking structure           */
9944 /*              family(I) - protocol family of address                      */
9945 /*              addr(I)   - pointer to network address                      */
9946 /*                                                                          */
9947 /* NOTE: THIS FUNCTION MUST BE CALLED WITH AN EXCLUSIVE LOCK THAT PREVENTS  */
9948 /*       ipf_ht_node_del FROM RUNNING CONCURRENTLY ON THE SAME htp.         */
9949 /*                                                                          */
9950 /* After preparing the key with the address information to find, look in    */
9951 /* the red-black tree to see if the address is known. A successful call to  */
9952 /* this function can mean one of two things: a new node was added to the    */
9953 /* tree or a matching node exists and we're able to bump up its activity.   */
9954 /* ------------------------------------------------------------------------ */
9955 int
9956 ipf_ht_node_add(softc, htp, family, addr)
9957         ipf_main_softc_t *softc;
9958         host_track_t *htp;
9959         int family;
9960         i6addr_t *addr;
9961 {
9962         host_node_t *h;
9963         host_node_t k;
9964
9965         ipf_ht_node_make_key(htp, &k, family, addr);
9966
9967         h = RBI_SEARCH(ipf_rb, &htp->ht_root, &k);
9968         if (h == NULL) {
9969                 if (htp->ht_cur_nodes >= htp->ht_max_nodes)
9970                         return -1;
9971                 KMALLOC(h, host_node_t *);
9972                 if (h == NULL) {
9973                         DT(ipf_rb_no_mem);
9974                         LBUMP(ipf_rb_no_mem);
9975                         return -1;
9976                 }
9977
9978                 /*
9979                  * If there was a macro to initialise the RB node then that
9980                  * would get used here, but there isn't...
9981                  */
9982                 bzero((char *)h, sizeof(*h));
9983                 h->hn_addr = k.hn_addr;
9984                 h->hn_addr.adf_family = k.hn_addr.adf_family;
9985                 RBI_INSERT(ipf_rb, &htp->ht_root, h);
9986                 htp->ht_cur_nodes++;
9987         } else {
9988                 if ((htp->ht_max_per_node != 0) &&
9989                     (h->hn_active >= htp->ht_max_per_node)) {
9990                         DT(ipf_rb_node_max);
9991                         LBUMP(ipf_rb_node_max);
9992                         return -1;
9993                 }
9994         }
9995
9996         h->hn_active++;
9997
9998         return 0;
9999 }
10000
10001
10002 /* ------------------------------------------------------------------------ */
10003 /* Function:    ipf_ht_node_del                                             */
10004 /* Returns:     int       - 0 == success,  -1 == failure                    */
10005 /* parameters:  htp(I)    - pointer to address tracking structure           */
10006 /*              family(I) - protocol family of address                      */
10007 /*              addr(I)   - pointer to network address                      */
10008 /*                                                                          */
10009 /* NOTE: THIS FUNCTION MUST BE CALLED WITH AN EXCLUSIVE LOCK THAT PREVENTS  */
10010 /*       ipf_ht_node_add FROM RUNNING CONCURRENTLY ON THE SAME htp.         */
10011 /*                                                                          */
10012 /* Try and find the address passed in amongst the leavese on this tree to   */
10013 /* be friend. If found then drop the active account for that node drops by  */
10014 /* one. If that count reaches 0, it is time to free it all up.              */
10015 /* ------------------------------------------------------------------------ */
10016 int
10017 ipf_ht_node_del(htp, family, addr)
10018         host_track_t *htp;
10019         int family;
10020         i6addr_t *addr;
10021 {
10022         host_node_t *h;
10023         host_node_t k;
10024
10025         ipf_ht_node_make_key(htp, &k, family, addr);
10026
10027         h = RBI_SEARCH(ipf_rb, &htp->ht_root, &k);
10028         if (h == NULL) {
10029                 return -1;
10030         } else {
10031                 h->hn_active--;
10032                 if (h->hn_active == 0) {
10033                         (void) RBI_DELETE(ipf_rb, &htp->ht_root, h);
10034                         htp->ht_cur_nodes--;
10035                         KFREE(h);
10036                 }
10037         }
10038
10039         return 0;
10040 }
10041
10042
10043 /* ------------------------------------------------------------------------ */
10044 /* Function:    ipf_rb_ht_init                                              */
10045 /* Returns:     Nil                                                         */
10046 /* Parameters:  head(I) - pointer to host tracking structure                */
10047 /*                                                                          */
10048 /* Initialise the host tracking structure to be ready for use above.        */
10049 /* ------------------------------------------------------------------------ */
10050 void
10051 ipf_rb_ht_init(head)
10052         host_track_t *head;
10053 {
10054         RBI_INIT(ipf_rb, &head->ht_root);
10055 }
10056
10057
10058 /* ------------------------------------------------------------------------ */
10059 /* Function:    ipf_rb_ht_freenode                                          */
10060 /* Returns:     Nil                                                         */
10061 /* Parameters:  head(I) - pointer to host tracking structure                */
10062 /*              arg(I)  - additional argument from walk caller              */
10063 /*                                                                          */
10064 /* Free an actual host_node_t structure.                                    */
10065 /* ------------------------------------------------------------------------ */
10066 void
10067 ipf_rb_ht_freenode(node, arg)
10068         host_node_t *node;
10069         void *arg;
10070 {
10071         KFREE(node);
10072 }
10073
10074
10075 /* ------------------------------------------------------------------------ */
10076 /* Function:    ipf_rb_ht_flush                                             */
10077 /* Returns:     Nil                                                         */
10078 /* Parameters:  head(I) - pointer to host tracking structure                */
10079 /*                                                                          */
10080 /* Remove all of the nodes in the tree tracking hosts by calling a walker   */
10081 /* and free'ing each one.                                                   */
10082 /* ------------------------------------------------------------------------ */
10083 void
10084 ipf_rb_ht_flush(head)
10085         host_track_t *head;
10086 {
10087         RBI_WALK(ipf_rb, &head->ht_root, ipf_rb_ht_freenode, NULL);
10088 }
10089
10090
10091 /* ------------------------------------------------------------------------ */
10092 /* Function:    ipf_slowtimer                                               */
10093 /* Returns:     Nil                                                         */
10094 /* Parameters:  ptr(I) - pointer to main ipf soft context structure         */
10095 /*                                                                          */
10096 /* Slowly expire held state for fragments.  Timeouts are set * in           */
10097 /* expectation of this being called twice per second.                       */
10098 /* ------------------------------------------------------------------------ */
10099 void
10100 ipf_slowtimer(softc)
10101         ipf_main_softc_t *softc;
10102 {
10103
10104         ipf_token_expire(softc);
10105         ipf_frag_expire(softc);
10106         ipf_state_expire(softc);
10107         ipf_nat_expire(softc);
10108         ipf_auth_expire(softc);
10109         ipf_lookup_expire(softc);
10110         ipf_rule_expire(softc);
10111         ipf_sync_expire(softc);
10112         softc->ipf_ticks++;
10113 #   if defined(__OpenBSD__)
10114         timeout_add(&ipf_slowtimer_ch, hz/2);
10115 #   endif
10116 }
10117
10118
10119 /* ------------------------------------------------------------------------ */
10120 /* Function:    ipf_inet_mask_add                                           */
10121 /* Returns:     Nil                                                         */
10122 /* Parameters:  bits(I) - pointer to nat context information                */
10123 /*              mtab(I) - pointer to mask hash table structure              */
10124 /*                                                                          */
10125 /* When called, bits represents the mask of a new NAT rule that has just    */
10126 /* been added. This function inserts a bitmask into the array of masks to   */
10127 /* search when searching for a matching NAT rule for a packet.              */
10128 /* Prevention of duplicate masks is achieved by checking the use count for  */
10129 /* a given netmask.                                                         */
10130 /* ------------------------------------------------------------------------ */
10131 void
10132 ipf_inet_mask_add(bits, mtab)
10133         int bits;
10134         ipf_v4_masktab_t *mtab;
10135 {
10136         u_32_t mask;
10137         int i, j;
10138
10139         mtab->imt4_masks[bits]++;
10140         if (mtab->imt4_masks[bits] > 1)
10141                 return;
10142
10143         if (bits == 0)
10144                 mask = 0;
10145         else
10146                 mask = 0xffffffff << (32 - bits);
10147
10148         for (i = 0; i < 33; i++) {
10149                 if (ntohl(mtab->imt4_active[i]) < mask) {
10150                         for (j = 32; j > i; j--)
10151                                 mtab->imt4_active[j] = mtab->imt4_active[j - 1];
10152                         mtab->imt4_active[i] = htonl(mask);
10153                         break;
10154                 }
10155         }
10156         mtab->imt4_max++;
10157 }
10158
10159
10160 /* ------------------------------------------------------------------------ */
10161 /* Function:    ipf_inet_mask_del                                           */
10162 /* Returns:     Nil                                                         */
10163 /* Parameters:  bits(I) - number of bits set in the netmask                 */
10164 /*              mtab(I) - pointer to mask hash table structure              */
10165 /*                                                                          */
10166 /* Remove the 32bit bitmask represented by "bits" from the collection of    */
10167 /* netmasks stored inside of mtab.                                          */
10168 /* ------------------------------------------------------------------------ */
10169 void
10170 ipf_inet_mask_del(bits, mtab)
10171         int bits;
10172         ipf_v4_masktab_t *mtab;
10173 {
10174         u_32_t mask;
10175         int i, j;
10176
10177         mtab->imt4_masks[bits]--;
10178         if (mtab->imt4_masks[bits] > 0)
10179                 return;
10180
10181         mask = htonl(0xffffffff << (32 - bits));
10182         for (i = 0; i < 33; i++) {
10183                 if (mtab->imt4_active[i] == mask) {
10184                         for (j = i + 1; j < 33; j++)
10185                                 mtab->imt4_active[j - 1] = mtab->imt4_active[j];
10186                         break;
10187                 }
10188         }
10189         mtab->imt4_max--;
10190         ASSERT(mtab->imt4_max >= 0);
10191 }
10192
10193
10194 #ifdef USE_INET6
10195 /* ------------------------------------------------------------------------ */
10196 /* Function:    ipf_inet6_mask_add                                          */
10197 /* Returns:     Nil                                                         */
10198 /* Parameters:  bits(I) - number of bits set in mask                        */
10199 /*              mask(I) - pointer to mask to add                            */
10200 /*              mtab(I) - pointer to mask hash table structure              */
10201 /*                                                                          */
10202 /* When called, bitcount represents the mask of a IPv6 NAT map rule that    */
10203 /* has just been added. This function inserts a bitmask into the array of   */
10204 /* masks to search when searching for a matching NAT rule for a packet.     */
10205 /* Prevention of duplicate masks is achieved by checking the use count for  */
10206 /* a given netmask.                                                         */
10207 /* ------------------------------------------------------------------------ */
10208 void
10209 ipf_inet6_mask_add(bits, mask, mtab)
10210         int bits;
10211         i6addr_t *mask;
10212         ipf_v6_masktab_t *mtab;
10213 {
10214         i6addr_t zero;
10215         int i, j;
10216
10217         mtab->imt6_masks[bits]++;
10218         if (mtab->imt6_masks[bits] > 1)
10219                 return;
10220
10221         if (bits == 0) {
10222                 mask = &zero;
10223                 zero.i6[0] = 0;
10224                 zero.i6[1] = 0;
10225                 zero.i6[2] = 0;
10226                 zero.i6[3] = 0;
10227         }
10228
10229         for (i = 0; i < 129; i++) {
10230                 if (IP6_LT(&mtab->imt6_active[i], mask)) {
10231                         for (j = 128; j > i; j--)
10232                                 mtab->imt6_active[j] = mtab->imt6_active[j - 1];
10233                         mtab->imt6_active[i] = *mask;
10234                         break;
10235                 }
10236         }
10237         mtab->imt6_max++;
10238 }
10239
10240
10241 /* ------------------------------------------------------------------------ */
10242 /* Function:    ipf_inet6_mask_del                                          */
10243 /* Returns:     Nil                                                         */
10244 /* Parameters:  bits(I) - number of bits set in mask                        */
10245 /*              mask(I) - pointer to mask to remove                         */
10246 /*              mtab(I) - pointer to mask hash table structure              */
10247 /*                                                                          */
10248 /* Remove the 128bit bitmask represented by "bits" from the collection of   */
10249 /* netmasks stored inside of mtab.                                          */
10250 /* ------------------------------------------------------------------------ */
10251 void
10252 ipf_inet6_mask_del(bits, mask, mtab)
10253         int bits;
10254         i6addr_t *mask;
10255         ipf_v6_masktab_t *mtab;
10256 {
10257         i6addr_t zero;
10258         int i, j;
10259
10260         mtab->imt6_masks[bits]--;
10261         if (mtab->imt6_masks[bits] > 0)
10262                 return;
10263
10264         if (bits == 0)
10265                 mask = &zero;
10266         zero.i6[0] = 0;
10267         zero.i6[1] = 0;
10268         zero.i6[2] = 0;
10269         zero.i6[3] = 0;
10270
10271         for (i = 0; i < 129; i++) {
10272                 if (IP6_EQ(&mtab->imt6_active[i], mask)) {
10273                         for (j = i + 1; j < 129; j++) {
10274                                 mtab->imt6_active[j - 1] = mtab->imt6_active[j];
10275                                 if (IP6_EQ(&mtab->imt6_active[j - 1], &zero))
10276                                         break;
10277                         }
10278                         break;
10279                 }
10280         }
10281         mtab->imt6_max--;
10282         ASSERT(mtab->imt6_max >= 0);
10283 }
10284 #endif