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 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                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_badfrag);
 633                 LBUMP(ipf_stats[fin->fin_out].fr_v6_bad);
 634         }
 635 }
 636
 637
 638 /* ------------------------------------------------------------------------ */
 639 /* Function:    ipf_pr_ipv6exthdr                                           */
 640 /* Returns:     struct ip6_ext * - pointer to the start of the next header  */
 641 /*                                 or NULL if there is a prolblem.          */
 642 /* Parameters:  fin(I)      - pointer to packet information                 */
 643 /*              multiple(I) - flag indicating yes/no if multiple occurances */
 644 /*                            of this extension header are allowed.         */
 645 /*              proto(I)    - protocol number for this extension header     */
 646 /*                                                                          */
 647 /* IPv6 Only                                                                */
 648 /* This function embodies a number of common checks that all IPv6 extension */
 649 /* headers must be subjected to.  For example, making sure the packet is    */
 650 /* big enough for it to be in, checking if it is repeated and setting a     */
 651 /* flag to indicate its presence.                                           */
 652 /* ------------------------------------------------------------------------ */
 653 static INLINE struct ip6_ext *
 654 ipf_pr_ipv6exthdr(fin, multiple, proto)
 655         fr_info_t *fin;
 656         int multiple, proto;
 657 {
 658         ipf_main_softc_t *softc = fin->fin_main_soft;
 659         struct ip6_ext *hdr;
 660         u_short shift;
 661         int i;
 662
 663         fin->fin_flx |= FI_V6EXTHDR;
 664
 665                                 /* 8 is default length of extension hdr */
 666         if ((fin->fin_dlen - 8) < 0) {
 667                 fin->fin_flx |= FI_SHORT;
 668                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_short);
 669                 return NULL;
 670         }
 671
 672         if (ipf_pr_pullup(fin, 8) == -1) {
 673                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_pullup);
 674                 return NULL;
 675         }
 676
 677         hdr = fin->fin_dp;
 678         switch (proto)
 679         {
 680         case IPPROTO_FRAGMENT :
 681                 shift = 8;
 682                 break;
 683         default :
 684                 shift = 8 + (hdr->ip6e_len << 3);
 685                 break;
 686         }
 687
 688         if (shift > fin->fin_dlen) {    /* Nasty extension header length? */
 689                 fin->fin_flx |= FI_BAD;
 690                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_hlen);
 691                 return NULL;
 692         }
 693
 694         fin->fin_dp = (char *)fin->fin_dp + shift;
 695         fin->fin_dlen -= shift;
 696
 697         /*
 698          * If we have seen a fragment header, do not set any flags to indicate
 699          * the presence of this extension header as it has no impact on the
 700          * end result until after it has been defragmented.
 701          */
 702         if (fin->fin_flx & FI_FRAG)
 703                 return hdr;
 704
 705         for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
 706                 if (ip6exthdr[i].ol_val == proto) {
 707                         /*
 708                          * Most IPv6 extension headers are only allowed once.
 709                          */
 710                         if ((multiple == 0) &&
 711                             ((fin->fin_optmsk & ip6exthdr[i].ol_bit) != 0))
 712                                 fin->fin_flx |= FI_BAD;
 713                         else
 714                                 fin->fin_optmsk |= ip6exthdr[i].ol_bit;
 715                         break;
 716                 }
 717
 718         return hdr;
 719 }
 720
 721
 722 /* ------------------------------------------------------------------------ */
 723 /* Function:    ipf_pr_hopopts6                                             */
 724 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 725 /* Parameters:  fin(I) - pointer to packet information                      */
 726 /*                                                                          */
 727 /* IPv6 Only                                                                */
 728 /* This is function checks pending hop by hop options extension header      */
 729 /* ------------------------------------------------------------------------ */
 730 static INLINE int
 731 ipf_pr_hopopts6(fin)
 732         fr_info_t *fin;
 733 {
 734         struct ip6_ext *hdr;
 735
 736         hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_HOPOPTS);
 737         if (hdr == NULL)
 738                 return IPPROTO_NONE;
 739         return hdr->ip6e_nxt;
 740 }
 741
 742
 743 /* ------------------------------------------------------------------------ */
 744 /* Function:    ipf_pr_mobility6                                            */
 745 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 746 /* Parameters:  fin(I) - pointer to packet information                      */
 747 /*                                                                          */
 748 /* IPv6 Only                                                                */
 749 /* This is function checks the IPv6 mobility extension header               */
 750 /* ------------------------------------------------------------------------ */
 751 static INLINE int
 752 ipf_pr_mobility6(fin)
 753         fr_info_t *fin;
 754 {
 755         struct ip6_ext *hdr;
 756
 757         hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_MOBILITY);
 758         if (hdr == NULL)
 759                 return IPPROTO_NONE;
 760         return hdr->ip6e_nxt;
 761 }
 762
 763
 764 /* ------------------------------------------------------------------------ */
 765 /* Function:    ipf_pr_routing6                                             */
 766 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 767 /* Parameters:  fin(I) - pointer to packet information                      */
 768 /*                                                                          */
 769 /* IPv6 Only                                                                */
 770 /* This is function checks pending routing extension header                 */
 771 /* ------------------------------------------------------------------------ */
 772 static INLINE int
 773 ipf_pr_routing6(fin)
 774         fr_info_t *fin;
 775 {
 776         struct ip6_routing *hdr;
 777
 778         hdr = (struct ip6_routing *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_ROUTING);
 779         if (hdr == NULL)
 780                 return IPPROTO_NONE;
 781
 782         switch (hdr->ip6r_type)
 783         {
 784         case 0 :
 785                 /*
 786                  * Nasty extension header length?
 787                  */
 788                 if (((hdr->ip6r_len >> 1) < hdr->ip6r_segleft) ||
 789                     (hdr->ip6r_segleft && (hdr->ip6r_len & 1))) {
 790                         ipf_main_softc_t *softc = fin->fin_main_soft;
 791
 792                         fin->fin_flx |= FI_BAD;
 793                         LBUMPD(ipf_stats[fin->fin_out], fr_v6_rh_bad);
 794                         return IPPROTO_NONE;
 795                 }
 796                 break;
 797
 798         default :
 799                 break;
 800         }
 801
 802         return hdr->ip6r_nxt;
 803 }
 804
 805
 806 /* ------------------------------------------------------------------------ */
 807 /* Function:    ipf_pr_fragment6                                            */
 808 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 809 /* Parameters:  fin(I) - pointer to packet information                      */
 810 /*                                                                          */
 811 /* IPv6 Only                                                                */
 812 /* Examine the IPv6 fragment header and extract fragment offset information.*/
 813 /*                                                                          */
 814 /* Fragments in IPv6 are extraordinarily difficult to deal with - much more */
 815 /* so than in IPv4.  There are 5 cases of fragments with IPv6 that all      */
 816 /* packets with a fragment header can fit into.  They are as follows:       */
 817 /*                                                                          */
 818 /* 1.  [IPv6][0-n EH][FH][0-n EH] (no L4HDR present)                        */
 819 /* 2.  [IPV6][0-n EH][FH][0-n EH][L4HDR part] (short)                       */
 820 /* 3.  [IPV6][0-n EH][FH][L4HDR part][0-n data] (short)                     */
 821 /* 4.  [IPV6][0-n EH][FH][0-n EH][L4HDR][0-n data]                          */
 822 /* 5.  [IPV6][0-n EH][FH][data]                                             */
 823 /*                                                                          */
 824 /* IPV6 = IPv6 header, FH = Fragment Header,                                */
 825 /* 0-n EH = 0 or more extension headers, 0-n data = 0 or more bytes of data */
 826 /*                                                                          */
 827 /* Packets that match 1, 2, 3 will be dropped as the only reasonable        */
 828 /* scenario in which they happen is in extreme circumstances that are most  */
 829 /* likely to be an indication of an attack rather than normal traffic.      */
 830 /* A type 3 packet may be sent by an attacked after a type 4 packet.  There */
 831 /* are two rules that can be used to guard against type 3 packets: L4       */
 832 /* headers must always be in a packet that has the offset field set to 0    */
 833 /* and no packet is allowed to overlay that where offset = 0.               */
 834 /* ------------------------------------------------------------------------ */
 835 static INLINE int
 836 ipf_pr_fragment6(fin)
 837         fr_info_t *fin;
 838 {
 839         ipf_main_softc_t *softc = fin->fin_main_soft;
 840         struct ip6_frag *frag;
 841
 842         fin->fin_flx |= FI_FRAG;
 843
 844         frag = (struct ip6_frag *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_FRAGMENT);
 845         if (frag == NULL) {
 846                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_frag_bad);
 847                 return IPPROTO_NONE;
 848         }
 849
 850         if ((frag->ip6f_offlg & IP6F_MORE_FRAG) != 0) {
 851                 /*
 852                  * Any fragment that isn't the last fragment must have its
 853                  * length as a multiple of 8.
 854                  */
 855                 if ((fin->fin_plen & 7) != 0)
 856                         fin->fin_flx |= FI_BAD;
 857         }
 858
 859         fin->fin_fraghdr = frag;
 860         fin->fin_id = frag->ip6f_ident;
 861         fin->fin_off = ntohs(frag->ip6f_offlg & IP6F_OFF_MASK);
 862         if (fin->fin_off != 0)
 863                 fin->fin_flx |= FI_FRAGBODY;
 864
 865         /*
 866          * Jumbograms aren't handled, so the max. length is 64k
 867          */
 868         if ((fin->fin_off << 3) + fin->fin_dlen > 65535)
 869                   fin->fin_flx |= FI_BAD;
 870
 871         /*
 872          * We don't know where the transport layer header (or whatever is next
 873          * is), as it could be behind destination options (amongst others) so
 874          * return the fragment header as the type of packet this is.  Note that
 875          * this effectively disables the fragment cache for > 1 protocol at a
 876          * time.
 877          */
 878         return frag->ip6f_nxt;
 879 }
 880
 881
 882 /* ------------------------------------------------------------------------ */
 883 /* Function:    ipf_pr_dstopts6                                             */
 884 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 885 /* Parameters:  fin(I) - pointer to packet information                      */
 886 /*                                                                          */
 887 /* IPv6 Only                                                                */
 888 /* This is function checks pending destination options extension header     */
 889 /* ------------------------------------------------------------------------ */
 890 static INLINE int
 891 ipf_pr_dstopts6(fin)
 892         fr_info_t *fin;
 893 {
 894         ipf_main_softc_t *softc = fin->fin_main_soft;
 895         struct ip6_ext *hdr;
 896
 897         hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_DSTOPTS);
 898         if (hdr == NULL) {
 899                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_dst_bad);
 900                 return IPPROTO_NONE;
 901         }
 902         return hdr->ip6e_nxt;
 903 }
 904
 905
 906 /* ------------------------------------------------------------------------ */
 907 /* Function:    ipf_pr_icmp6                                                */
 908 /* Returns:     void                                                        */
 909 /* Parameters:  fin(I) - pointer to packet information                      */
 910 /*                                                                          */
 911 /* IPv6 Only                                                                */
 912 /* This routine is mainly concerned with determining the minimum valid size */
 913 /* for an ICMPv6 packet.                                                    */
 914 /* ------------------------------------------------------------------------ */
 915 static INLINE void
 916 ipf_pr_icmp6(fin)
 917         fr_info_t *fin;
 918 {
 919         int minicmpsz = sizeof(struct icmp6_hdr);
 920         struct icmp6_hdr *icmp6;
 921
 922         if (ipf_pr_pullup(fin, ICMP6ERR_MINPKTLEN - sizeof(ip6_t)) == -1) {
 923                 ipf_main_softc_t *softc = fin->fin_main_soft;
 924
 925                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_icmp6_pullup);
 926                 return;
 927         }
 928
 929         if (fin->fin_dlen > 1) {
 930                 ip6_t *ip6;
 931
 932                 icmp6 = fin->fin_dp;
 933
 934                 fin->fin_data[0] = *(u_short *)icmp6;
 935
 936                 if ((icmp6->icmp6_type & ICMP6_INFOMSG_MASK) != 0)
 937                         fin->fin_flx |= FI_ICMPQUERY;
 938
 939                 switch (icmp6->icmp6_type)
 940                 {
 941                 case ICMP6_ECHO_REPLY :
 942                 case ICMP6_ECHO_REQUEST :
 943                         if (fin->fin_dlen >= 6)
 944                                 fin->fin_data[1] = icmp6->icmp6_id;
 945                         minicmpsz = ICMP6ERR_MINPKTLEN - sizeof(ip6_t);
 946                         break;
 947
 948                 case ICMP6_DST_UNREACH :
 949                 case ICMP6_PACKET_TOO_BIG :
 950                 case ICMP6_TIME_EXCEEDED :
 951                 case ICMP6_PARAM_PROB :
 952                         fin->fin_flx |= FI_ICMPERR;
 953                         minicmpsz = ICMP6ERR_IPICMPHLEN - sizeof(ip6_t);
 954                         if (fin->fin_plen < ICMP6ERR_IPICMPHLEN)
 955                                 break;
 956
 957                         if (M_LEN(fin->fin_m) < fin->fin_plen) {
 958                                 if (ipf_coalesce(fin) != 1)
 959                                         return;
 960                         }
 961
 962                         if (ipf_pr_pullup(fin, ICMP6ERR_MINPKTLEN) == -1)
 963                                 return;
 964
 965                         /*
 966                          * If the destination of this packet doesn't match the
 967                          * source of the original packet then this packet is
 968                          * not correct.
 969                          */
 970                         icmp6 = fin->fin_dp;
 971                         ip6 = (ip6_t *)((char *)icmp6 + ICMPERR_ICMPHLEN);
 972                         if (IP6_NEQ(&fin->fin_fi.fi_dst,
 973                                     (i6addr_t *)&ip6->ip6_src))
 974                                 fin->fin_flx |= FI_BAD;
 975                         break;
 976                 default :
 977                         break;
 978                 }
 979         }
 980
 981         ipf_pr_short6(fin, minicmpsz);
 982         if ((fin->fin_flx & (FI_SHORT|FI_BAD)) == 0) {
 983                 u_char p = fin->fin_p;
 984
 985                 fin->fin_p = IPPROTO_ICMPV6;
 986                 ipf_checkv6sum(fin);
 987                 fin->fin_p = p;
 988         }
 989 }
 990
 991
 992 /* ------------------------------------------------------------------------ */
 993 /* Function:    ipf_pr_udp6                                                 */
 994 /* Returns:     void                                                        */
 995 /* Parameters:  fin(I) - pointer to packet information                      */
 996 /*                                                                          */
 997 /* IPv6 Only                                                                */
 998 /* Analyse the packet for IPv6/UDP properties.                              */
 999 /* Is not expected to be called for fragmented packets.                     */
1000 /* ------------------------------------------------------------------------ */
1001 static INLINE void
1002 ipf_pr_udp6(fin)
1003         fr_info_t *fin;
1004 {
1005
1006         if (ipf_pr_udpcommon(fin) == 0) {
1007                 u_char p = fin->fin_p;
1008
1009                 fin->fin_p = IPPROTO_UDP;
1010                 ipf_checkv6sum(fin);
1011                 fin->fin_p = p;
1012         }
1013 }
1014
1015
1016 /* ------------------------------------------------------------------------ */
1017 /* Function:    ipf_pr_tcp6                                                 */
1018 /* Returns:     void                                                        */
1019 /* Parameters:  fin(I) - pointer to packet information                      */
1020 /*                                                                          */
1021 /* IPv6 Only                                                                */
1022 /* Analyse the packet for IPv6/TCP properties.                              */
1023 /* Is not expected to be called for fragmented packets.                     */
1024 /* ------------------------------------------------------------------------ */
1025 static INLINE void
1026 ipf_pr_tcp6(fin)
1027         fr_info_t *fin;
1028 {
1029
1030         if (ipf_pr_tcpcommon(fin) == 0) {
1031                 u_char p = fin->fin_p;
1032
1033                 fin->fin_p = IPPROTO_TCP;
1034                 ipf_checkv6sum(fin);
1035                 fin->fin_p = p;
1036         }
1037 }
1038
1039
1040 /* ------------------------------------------------------------------------ */
1041 /* Function:    ipf_pr_esp6                                                 */
1042 /* Returns:     void                                                        */
1043 /* Parameters:  fin(I) - pointer to packet information                      */
1044 /*                                                                          */
1045 /* IPv6 Only                                                                */
1046 /* Analyse the packet for ESP properties.                                   */
1047 /* The minimum length is taken to be the SPI (32bits) plus a tail (32bits)  */
1048 /* even though the newer ESP packets must also have a sequence number that  */
1049 /* is 32bits as well, it is not possible(?) to determine the version from a */
1050 /* simple packet header.                                                    */
1051 /* ------------------------------------------------------------------------ */
1052 static INLINE void
1053 ipf_pr_esp6(fin)
1054         fr_info_t *fin;
1055 {
1056
1057         if ((fin->fin_off == 0) && (ipf_pr_pullup(fin, 8) == -1)) {
1058                 ipf_main_softc_t *softc = fin->fin_main_soft;
1059
1060                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_esp_pullup);
1061                 return;
1062         }
1063 }
1064
1065
1066 /* ------------------------------------------------------------------------ */
1067 /* Function:    ipf_pr_ah6                                                  */
1068 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
1069 /* Parameters:  fin(I) - pointer to packet information                      */
1070 /*                                                                          */
1071 /* IPv6 Only                                                                */
1072 /* Analyse the packet for AH properties.                                    */
1073 /* The minimum length is taken to be the combination of all fields in the   */
1074 /* header being present and no authentication data (null algorithm used.)   */
1075 /* ------------------------------------------------------------------------ */
1076 static INLINE int
1077 ipf_pr_ah6(fin)
1078         fr_info_t *fin;
1079 {
1080         authhdr_t *ah;
1081
1082         fin->fin_flx |= FI_AH;
1083
1084         ah = (authhdr_t *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_HOPOPTS);
1085         if (ah == NULL) {
1086                 ipf_main_softc_t *softc = fin->fin_main_soft;
1087
1088                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ah_bad);
1089                 return IPPROTO_NONE;
1090         }
1091
1092         ipf_pr_short6(fin, sizeof(*ah));
1093
1094         /*
1095          * No need for another pullup, ipf_pr_ipv6exthdr() will pullup
1096          * enough data to satisfy ah_next (the very first one.)
1097          */
1098         return ah->ah_next;
1099 }
1100
1101
1102 /* ------------------------------------------------------------------------ */
1103 /* Function:    ipf_pr_gre6                                                 */
1104 /* Returns:     void                                                        */
1105 /* Parameters:  fin(I) - pointer to packet information                      */
1106 /*                                                                          */
1107 /* Analyse the packet for GRE properties.                                   */
1108 /* ------------------------------------------------------------------------ */
1109 static INLINE void
1110 ipf_pr_gre6(fin)
1111         fr_info_t *fin;
1112 {
1113         grehdr_t *gre;
1114
1115         if (ipf_pr_pullup(fin, sizeof(grehdr_t)) == -1) {
1116                 ipf_main_softc_t *softc = fin->fin_main_soft;
1117
1118                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_gre_pullup);
1119                 return;
1120         }
1121
1122         gre = fin->fin_dp;
1123         if (GRE_REV(gre->gr_flags) == 1)
1124                 fin->fin_data[0] = gre->gr_call;
1125 }
1126 #endif  /* USE_INET6 */
1127
1128
1129 /* ------------------------------------------------------------------------ */
1130 /* Function:    ipf_pr_pullup                                               */
1131 /* Returns:     int     - 0 == pullup succeeded, -1 == failure              */
1132 /* Parameters:  fin(I)  - pointer to packet information                     */
1133 /*              plen(I) - length (excluding L3 header) to pullup            */
1134 /*                                                                          */
1135 /* Short inline function to cut down on code duplication to perform a call  */
1136 /* to ipf_pullup to ensure there is the required amount of data,            */
1137 /* consecutively in the packet buffer.                                      */
1138 /*                                                                          */
1139 /* This function pulls up 'extra' data at the location of fin_dp.  fin_dp   */
1140 /* points to the first byte after the complete layer 3 header, which will   */
1141 /* include all of the known extension headers for IPv6 or options for IPv4. */
1142 /*                                                                          */
1143 /* Since fr_pullup() expects the total length of bytes to be pulled up, it  */
1144 /* is necessary to add those we can already assume to be pulled up (fin_dp  */
1145 /* - fin_ip) to what is passed through.                                     */
1146 /* ------------------------------------------------------------------------ */
1147 int
1148 ipf_pr_pullup(fin, plen)
1149         fr_info_t *fin;
1150         int plen;
1151 {
1152         ipf_main_softc_t *softc = fin->fin_main_soft;
1153
1154         if (fin->fin_m != NULL) {
1155                 if (fin->fin_dp != NULL)
1156                         plen += (char *)fin->fin_dp -
1157                                 ((char *)fin->fin_ip + fin->fin_hlen);
1158                 plen += fin->fin_hlen;
1159                 if (M_LEN(fin->fin_m) < plen + fin->fin_ipoff) {
1160 #if defined(_KERNEL)
1161                         if (ipf_pullup(fin->fin_m, fin, plen) == NULL) {
1162                                 DT(ipf_pullup_fail);
1163                                 LBUMP(ipf_stats[fin->fin_out].fr_pull[1]);
1164                                 return -1;
1165                         }
1166                         LBUMP(ipf_stats[fin->fin_out].fr_pull[0]);
1167 #else
1168                         LBUMP(ipf_stats[fin->fin_out].fr_pull[1]);
1169                         /*
1170                          * Fake ipf_pullup failing
1171                          */
1172                         fin->fin_reason = FRB_PULLUP;
1173                         *fin->fin_mp = NULL;
1174                         fin->fin_m = NULL;
1175                         fin->fin_ip = NULL;
1176                         return -1;
1177 #endif
1178                 }
1179         }
1180         return 0;
1181 }
1182
1183
1184 /* ------------------------------------------------------------------------ */
1185 /* Function:    ipf_pr_short                                                */
1186 /* Returns:     void                                                        */
1187 /* Parameters:  fin(I)  - pointer to packet information                     */
1188 /*              xmin(I) - minimum header size                               */
1189 /*                                                                          */
1190 /* Check if a packet is "short" as defined by xmin.  The rule we are        */
1191 /* applying here is that the packet must not be fragmented within the layer */
1192 /* 4 header.  That is, it must not be a fragment that has its offset set to */
1193 /* start within the layer 4 header (hdrmin) or if it is at offset 0, the    */
1194 /* entire layer 4 header must be present (min).                             */
1195 /* ------------------------------------------------------------------------ */
1196 static INLINE void
1197 ipf_pr_short(fin, xmin)
1198         fr_info_t *fin;
1199         int xmin;
1200 {
1201
1202         if (fin->fin_off == 0) {
1203                 if (fin->fin_dlen < xmin)
1204                         fin->fin_flx |= FI_SHORT;
1205         } else if (fin->fin_off < xmin) {
1206                 fin->fin_flx |= FI_SHORT;
1207         }
1208 }
1209
1210
1211 /* ------------------------------------------------------------------------ */
1212 /* Function:    ipf_pr_icmp                                                 */
1213 /* Returns:     void                                                        */
1214 /* Parameters:  fin(I) - pointer to packet information                      */
1215 /*                                                                          */
1216 /* IPv4 Only                                                                */
1217 /* Do a sanity check on the packet for ICMP (v4).  In nearly all cases,     */
1218 /* except extrememly bad packets, both type and code will be present.       */
1219 /* The expected minimum size of an ICMP packet is very much dependent on    */
1220 /* the type of it.                                                          */
1221 /*                                                                          */
1222 /* XXX - other ICMP sanity checks?                                          */
1223 /* ------------------------------------------------------------------------ */
1224 static INLINE void
1225 ipf_pr_icmp(fin)
1226         fr_info_t *fin;
1227 {
1228         ipf_main_softc_t *softc = fin->fin_main_soft;
1229         int minicmpsz = sizeof(struct icmp);
1230         icmphdr_t *icmp;
1231         ip_t *oip;
1232
1233         ipf_pr_short(fin, ICMPERR_ICMPHLEN);
1234
1235         if (fin->fin_off != 0) {
1236                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_icmp_frag);
1237                 return;
1238         }
1239
1240         if (ipf_pr_pullup(fin, ICMPERR_ICMPHLEN) == -1) {
1241                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_icmp_pullup);
1242                 return;
1243         }
1244
1245         icmp = fin->fin_dp;
1246
1247         fin->fin_data[0] = *(u_short *)icmp;
1248         fin->fin_data[1] = icmp->icmp_id;
1249
1250         switch (icmp->icmp_type)
1251         {
1252         case ICMP_ECHOREPLY :
1253         case ICMP_ECHO :
1254         /* Router discovery messaes - RFC 1256 */
1255         case ICMP_ROUTERADVERT :
1256         case ICMP_ROUTERSOLICIT :
1257                 fin->fin_flx |= FI_ICMPQUERY;
1258                 minicmpsz = ICMP_MINLEN;
1259                 break;
1260         /*
1261          * type(1) + code(1) + cksum(2) + id(2) seq(2) +
1262          * 3 * timestamp(3 * 4)
1263          */
1264         case ICMP_TSTAMP :
1265         case ICMP_TSTAMPREPLY :
1266                 fin->fin_flx |= FI_ICMPQUERY;
1267                 minicmpsz = 20;
1268                 break;
1269         /*
1270          * type(1) + code(1) + cksum(2) + id(2) seq(2) +
1271          * mask(4)
1272          */
1273         case ICMP_IREQ :
1274         case ICMP_IREQREPLY :
1275         case ICMP_MASKREQ :
1276         case ICMP_MASKREPLY :
1277                 fin->fin_flx |= FI_ICMPQUERY;
1278                 minicmpsz = 12;
1279                 break;
1280         /*
1281          * type(1) + code(1) + cksum(2) + id(2) seq(2) + ip(20+)
1282          */
1283         case ICMP_UNREACH :
1284 #ifdef icmp_nextmtu
1285                 if (icmp->icmp_code == ICMP_UNREACH_NEEDFRAG) {
1286                         if (icmp->icmp_nextmtu < softc->ipf_icmpminfragmtu)
1287                                 fin->fin_flx |= FI_BAD;
1288                 }
1289 #endif
1290                 /* FALLTHROUGH */
1291         case ICMP_SOURCEQUENCH :
1292         case ICMP_REDIRECT :
1293         case ICMP_TIMXCEED :
1294         case ICMP_PARAMPROB :
1295                 fin->fin_flx |= FI_ICMPERR;
1296                 if (ipf_coalesce(fin) != 1) {
1297                         LBUMPD(ipf_stats[fin->fin_out], fr_icmp_coalesce);
1298                         return;
1299                 }
1300
1301                 /*
1302                  * ICMP error packets should not be generated for IP
1303                  * packets that are a fragment that isn't the first
1304                  * fragment.
1305                  */
1306                 oip = (ip_t *)((char *)fin->fin_dp + ICMPERR_ICMPHLEN);
1307                 if ((ntohs(oip->ip_off) & IP_OFFMASK) != 0)
1308                         fin->fin_flx |= FI_BAD;
1309
1310                 /*
1311                  * If the destination of this packet doesn't match the
1312                  * source of the original packet then this packet is
1313                  * not correct.
1314                  */
1315                 if (oip->ip_src.s_addr != fin->fin_daddr)
1316                         fin->fin_flx |= FI_BAD;
1317                 break;
1318         default :
1319                 break;
1320         }
1321
1322         ipf_pr_short(fin, minicmpsz);
1323
1324         ipf_checkv4sum(fin);
1325 }
1326
1327
1328 /* ------------------------------------------------------------------------ */
1329 /* Function:    ipf_pr_tcpcommon                                            */
1330 /* Returns:     int    - 0 = header ok, 1 = bad packet, -1 = buffer error   */
1331 /* Parameters:  fin(I) - pointer to packet information                      */
1332 /*                                                                          */
1333 /* TCP header sanity checking.  Look for bad combinations of TCP flags,     */
1334 /* and make some checks with how they interact with other fields.           */
1335 /* If compiled with IPFILTER_CKSUM, check to see if the TCP checksum is     */
1336 /* valid and mark the packet as bad if not.                                 */
1337 /* ------------------------------------------------------------------------ */
1338 static INLINE int
1339 ipf_pr_tcpcommon(fin)
1340         fr_info_t *fin;
1341 {
1342         ipf_main_softc_t *softc = fin->fin_main_soft;
1343         int flags, tlen;
1344         tcphdr_t *tcp;
1345
1346         fin->fin_flx |= FI_TCPUDP;
1347         if (fin->fin_off != 0) {
1348                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_frag);
1349                 return 0;
1350         }
1351
1352         if (ipf_pr_pullup(fin, sizeof(*tcp)) == -1) {
1353                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_pullup);
1354                 return -1;
1355         }
1356
1357         tcp = fin->fin_dp;
1358         if (fin->fin_dlen > 3) {
1359                 fin->fin_sport = ntohs(tcp->th_sport);
1360                 fin->fin_dport = ntohs(tcp->th_dport);
1361         }
1362
1363         if ((fin->fin_flx & FI_SHORT) != 0) {
1364                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_short);
1365                 return 1;
1366         }
1367
1368         /*
1369          * Use of the TCP data offset *must* result in a value that is at
1370          * least the same size as the TCP header.
1371          */
1372         tlen = TCP_OFF(tcp) << 2;
1373         if (tlen < sizeof(tcphdr_t)) {
1374                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_small);
1375                 fin->fin_flx |= FI_BAD;
1376                 return 1;
1377         }
1378
1379         flags = tcp->th_flags;
1380         fin->fin_tcpf = tcp->th_flags;
1381
1382         /*
1383          * If the urgent flag is set, then the urgent pointer must
1384          * also be set and vice versa.  Good TCP packets do not have
1385          * just one of these set.
1386          */
1387         if ((flags & TH_URG) != 0 && (tcp->th_urp == 0)) {
1388                 fin->fin_flx |= FI_BAD;
1389 #if 0
1390         } else if ((flags & TH_URG) == 0 && (tcp->th_urp != 0)) {
1391                 /*
1392                  * Ignore this case (#if 0) as it shows up in "real"
1393                  * traffic with bogus values in the urgent pointer field.
1394                  */
1395                 fin->fin_flx |= FI_BAD;
1396 #endif
1397         } else if (((flags & (TH_SYN|TH_FIN)) != 0) &&
1398                    ((flags & (TH_RST|TH_ACK)) == TH_RST)) {
1399                 /* TH_FIN|TH_RST|TH_ACK seems to appear "naturally" */
1400                 fin->fin_flx |= FI_BAD;
1401 #if 1
1402         } else if (((flags & TH_SYN) != 0) &&
1403                    ((flags & (TH_URG|TH_PUSH)) != 0)) {
1404                 /*
1405                  * SYN with URG and PUSH set is not for normal TCP but it is
1406                  * possible(?) with T/TCP...but who uses T/TCP?
1407                  */
1408                 fin->fin_flx |= FI_BAD;
1409 #endif
1410         } else if (!(flags & TH_ACK)) {
1411                 /*
1412                  * If the ack bit isn't set, then either the SYN or
1413                  * RST bit must be set.  If the SYN bit is set, then
1414                  * we expect the ACK field to be 0.  If the ACK is
1415                  * not set and if URG, PSH or FIN are set, consdier
1416                  * that to indicate a bad TCP packet.
1417                  */
1418                 if ((flags == TH_SYN) && (tcp->th_ack != 0)) {
1419                         /*
1420                          * Cisco PIX sets the ACK field to a random value.
1421                          * In light of this, do not set FI_BAD until a patch
1422                          * is available from Cisco to ensure that
1423                          * interoperability between existing systems is
1424                          * achieved.
1425                          */
1426                         /*fin->fin_flx |= FI_BAD*/;
1427                 } else if (!(flags & (TH_RST|TH_SYN))) {
1428                         fin->fin_flx |= FI_BAD;
1429                 } else if ((flags & (TH_URG|TH_PUSH|TH_FIN)) != 0) {
1430                         fin->fin_flx |= FI_BAD;
1431                 }
1432         }
1433         if (fin->fin_flx & FI_BAD) {
1434                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_bad_flags);
1435                 return 1;
1436         }
1437
1438         /*
1439          * At this point, it's not exactly clear what is to be gained by
1440          * marking up which TCP options are and are not present.  The one we
1441          * are most interested in is the TCP window scale.  This is only in
1442          * a SYN packet [RFC1323] so we don't need this here...?
1443          * Now if we were to analyse the header for passive fingerprinting,
1444          * then that might add some weight to adding this...
1445          */
1446         if (tlen == sizeof(tcphdr_t)) {
1447                 return 0;
1448         }
1449
1450         if (ipf_pr_pullup(fin, tlen) == -1) {
1451                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_pullup);
1452                 return -1;
1453         }
1454
1455 #if 0
1456         tcp = fin->fin_dp;
1457         ip = fin->fin_ip;
1458         s = (u_char *)(tcp + 1);
1459         off = IP_HL(ip) << 2;
1460 # ifdef _KERNEL
1461         if (fin->fin_mp != NULL) {
1462                 mb_t *m = *fin->fin_mp;
1463
1464                 if (off + tlen > M_LEN(m))
1465                         return;
1466         }
1467 # endif
1468         for (tlen -= (int)sizeof(*tcp); tlen > 0; ) {
1469                 opt = *s;
1470                 if (opt == '\0')
1471                         break;
1472                 else if (opt == TCPOPT_NOP)
1473                         ol = 1;
1474                 else {
1475                         if (tlen < 2)
1476                                 break;
1477                         ol = (int)*(s + 1);
1478                         if (ol < 2 || ol > tlen)
1479                                 break;
1480                 }
1481
1482                 for (i = 9, mv = 4; mv >= 0; ) {
1483                         op = ipopts + i;
1484                         if (opt == (u_char)op->ol_val) {
1485                                 optmsk |= op->ol_bit;
1486                                 break;
1487                         }
1488                 }
1489                 tlen -= ol;
1490                 s += ol;
1491         }
1492 #endif /* 0 */
1493
1494         return 0;
1495 }
1496
1497
1498
1499 /* ------------------------------------------------------------------------ */
1500 /* Function:    ipf_pr_udpcommon                                            */
1501 /* Returns:     int    - 0 = header ok, 1 = bad packet                      */
1502 /* Parameters:  fin(I) - pointer to packet information                      */
1503 /*                                                                          */
1504 /* Extract the UDP source and destination ports, if present.  If compiled   */
1505 /* with IPFILTER_CKSUM, check to see if the UDP checksum is valid.          */
1506 /* ------------------------------------------------------------------------ */
1507 static INLINE int
1508 ipf_pr_udpcommon(fin)
1509         fr_info_t *fin;
1510 {
1511         udphdr_t *udp;
1512
1513         fin->fin_flx |= FI_TCPUDP;
1514
1515         if (!fin->fin_off && (fin->fin_dlen > 3)) {
1516                 if (ipf_pr_pullup(fin, sizeof(*udp)) == -1) {
1517                         ipf_main_softc_t *softc = fin->fin_main_soft;
1518
1519                         fin->fin_flx |= FI_SHORT;
1520                         LBUMPD(ipf_stats[fin->fin_out], fr_udp_pullup);
1521                         return 1;
1522                 }
1523
1524                 udp = fin->fin_dp;
1525
1526                 fin->fin_sport = ntohs(udp->uh_sport);
1527                 fin->fin_dport = ntohs(udp->uh_dport);
1528         }
1529
1530         return 0;
1531 }
1532
1533
1534 /* ------------------------------------------------------------------------ */
1535 /* Function:    ipf_pr_tcp                                                  */
1536 /* Returns:     void                                                        */
1537 /* Parameters:  fin(I) - pointer to packet information                      */
1538 /*                                                                          */
1539 /* IPv4 Only                                                                */
1540 /* Analyse the packet for IPv4/TCP properties.                              */
1541 /* ------------------------------------------------------------------------ */
1542 static INLINE void
1543 ipf_pr_tcp(fin)
1544         fr_info_t *fin;
1545 {
1546
1547         ipf_pr_short(fin, sizeof(tcphdr_t));
1548
1549         if (ipf_pr_tcpcommon(fin) == 0)
1550                 ipf_checkv4sum(fin);
1551 }
1552
1553
1554 /* ------------------------------------------------------------------------ */
1555 /* Function:    ipf_pr_udp                                                  */
1556 /* Returns:     void                                                        */
1557 /* Parameters:  fin(I) - pointer to packet information                      */
1558 /*                                                                          */
1559 /* IPv4 Only                                                                */
1560 /* Analyse the packet for IPv4/UDP properties.                              */
1561 /* ------------------------------------------------------------------------ */
1562 static INLINE void
1563 ipf_pr_udp(fin)
1564         fr_info_t *fin;
1565 {
1566
1567         ipf_pr_short(fin, sizeof(udphdr_t));
1568
1569         if (ipf_pr_udpcommon(fin) == 0)
1570                 ipf_checkv4sum(fin);
1571 }
1572
1573
1574 /* ------------------------------------------------------------------------ */
1575 /* Function:    ipf_pr_esp                                                  */
1576 /* Returns:     void                                                        */
1577 /* Parameters:  fin(I) - pointer to packet information                      */
1578 /*                                                                          */
1579 /* Analyse the packet for ESP properties.                                   */
1580 /* The minimum length is taken to be the SPI (32bits) plus a tail (32bits)  */
1581 /* even though the newer ESP packets must also have a sequence number that  */
1582 /* is 32bits as well, it is not possible(?) to determine the version from a */
1583 /* simple packet header.                                                    */
1584 /* ------------------------------------------------------------------------ */
1585 static INLINE void
1586 ipf_pr_esp(fin)
1587         fr_info_t *fin;
1588 {
1589
1590         if (fin->fin_off == 0) {
1591                 ipf_pr_short(fin, 8);
1592                 if (ipf_pr_pullup(fin, 8) == -1) {
1593                         ipf_main_softc_t *softc = fin->fin_main_soft;
1594
1595                         LBUMPD(ipf_stats[fin->fin_out], fr_v4_esp_pullup);
1596                 }
1597         }
1598 }
1599
1600
1601 /* ------------------------------------------------------------------------ */
1602 /* Function:    ipf_pr_ah                                                   */
1603 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
1604 /* Parameters:  fin(I) - pointer to packet information                      */
1605 /*                                                                          */
1606 /* Analyse the packet for AH properties.                                    */
1607 /* The minimum length is taken to be the combination of all fields in the   */
1608 /* header being present and no authentication data (null algorithm used.)   */
1609 /* ------------------------------------------------------------------------ */
1610 static INLINE int
1611 ipf_pr_ah(fin)
1612         fr_info_t *fin;
1613 {
1614         ipf_main_softc_t *softc = fin->fin_main_soft;
1615         authhdr_t *ah;
1616         int len;
1617
1618         fin->fin_flx |= FI_AH;
1619         ipf_pr_short(fin, sizeof(*ah));
1620
1621         if (((fin->fin_flx & FI_SHORT) != 0) || (fin->fin_off != 0)) {
1622                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_ah_bad);
1623                 return IPPROTO_NONE;
1624         }
1625
1626         if (ipf_pr_pullup(fin, sizeof(*ah)) == -1) {
1627                 DT(fr_v4_ah_pullup_1);
1628                 LBUMP(ipf_stats[fin->fin_out].fr_v4_ah_pullup);
1629                 return IPPROTO_NONE;
1630         }
1631
1632         ah = (authhdr_t *)fin->fin_dp;
1633
1634         len = (ah->ah_plen + 2) << 2;
1635         ipf_pr_short(fin, len);
1636         if (ipf_pr_pullup(fin, len) == -1) {
1637                 DT(fr_v4_ah_pullup_2);
1638                 LBUMP(ipf_stats[fin->fin_out].fr_v4_ah_pullup);
1639                 return IPPROTO_NONE;
1640         }
1641
1642         /*
1643          * Adjust fin_dp and fin_dlen for skipping over the authentication
1644          * header.
1645          */
1646         fin->fin_dp = (char *)fin->fin_dp + len;
1647         fin->fin_dlen -= len;
1648         return ah->ah_next;
1649 }
1650
1651
1652 /* ------------------------------------------------------------------------ */
1653 /* Function:    ipf_pr_gre                                                  */
1654 /* Returns:     void                                                        */
1655 /* Parameters:  fin(I) - pointer to packet information                      */
1656 /*                                                                          */
1657 /* Analyse the packet for GRE properties.                                   */
1658 /* ------------------------------------------------------------------------ */
1659 static INLINE void
1660 ipf_pr_gre(fin)
1661         fr_info_t *fin;
1662 {
1663         ipf_main_softc_t *softc = fin->fin_main_soft;
1664         grehdr_t *gre;
1665
1666         ipf_pr_short(fin, sizeof(grehdr_t));
1667
1668         if (fin->fin_off != 0) {
1669                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_gre_frag);
1670                 return;
1671         }
1672
1673         if (ipf_pr_pullup(fin, sizeof(grehdr_t)) == -1) {
1674                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_gre_pullup);
1675                 return;
1676         }
1677
1678         gre = fin->fin_dp;
1679         if (GRE_REV(gre->gr_flags) == 1)
1680                 fin->fin_data[0] = gre->gr_call;
1681 }
1682
1683
1684 /* ------------------------------------------------------------------------ */
1685 /* Function:    ipf_pr_ipv4hdr                                              */
1686 /* Returns:     void                                                        */
1687 /* Parameters:  fin(I) - pointer to packet information                      */
1688 /*                                                                          */
1689 /* IPv4 Only                                                                */
1690 /* Analyze the IPv4 header and set fields in the fr_info_t structure.       */
1691 /* Check all options present and flag their presence if any exist.          */
1692 /* ------------------------------------------------------------------------ */
1693 static INLINE void
1694 ipf_pr_ipv4hdr(fin)
1695         fr_info_t *fin;
1696 {
1697         u_short optmsk = 0, secmsk = 0, auth = 0;
1698         int hlen, ol, mv, p, i;
1699         const struct optlist *op;
1700         u_char *s, opt;
1701         u_short off;
1702         fr_ip_t *fi;
1703         ip_t *ip;
1704
1705         fi = &fin->fin_fi;
1706         hlen = fin->fin_hlen;
1707
1708         ip = fin->fin_ip;
1709         p = ip->ip_p;
1710         fi->fi_p = p;
1711         fin->fin_crc = p;
1712         fi->fi_tos = ip->ip_tos;
1713         fin->fin_id = ip->ip_id;
1714         off = ntohs(ip->ip_off);
1715
1716         /* Get both TTL and protocol */
1717         fi->fi_p = ip->ip_p;
1718         fi->fi_ttl = ip->ip_ttl;
1719
1720         /* Zero out bits not used in IPv6 address */
1721         fi->fi_src.i6[1] = 0;
1722         fi->fi_src.i6[2] = 0;
1723         fi->fi_src.i6[3] = 0;
1724         fi->fi_dst.i6[1] = 0;
1725         fi->fi_dst.i6[2] = 0;
1726         fi->fi_dst.i6[3] = 0;
1727
1728         fi->fi_saddr = ip->ip_src.s_addr;
1729         fin->fin_crc += fi->fi_saddr;
1730         fi->fi_daddr = ip->ip_dst.s_addr;
1731         fin->fin_crc += fi->fi_daddr;
1732         if (IN_CLASSD(ntohl(fi->fi_daddr)))
1733                 fin->fin_flx |= FI_MULTICAST|FI_MBCAST;
1734
1735         /*
1736          * set packet attribute flags based on the offset and
1737          * calculate the byte offset that it represents.
1738          */
1739         off &= IP_MF|IP_OFFMASK;
1740         if (off != 0) {
1741                 int morefrag = off & IP_MF;
1742
1743                 fi->fi_flx |= FI_FRAG;
1744                 off &= IP_OFFMASK;
1745                 if (off != 0) {
1746                         fin->fin_flx |= FI_FRAGBODY;
1747                         off <<= 3;
1748                         if ((off + fin->fin_dlen > 65535) ||
1749                             (fin->fin_dlen == 0) ||
1750                             ((morefrag != 0) && ((fin->fin_dlen & 7) != 0))) {
1751                                 /*
1752                                  * The length of the packet, starting at its
1753                                  * offset cannot exceed 65535 (0xffff) as the
1754                                  * length of an IP packet is only 16 bits.
1755                                  *
1756                                  * Any fragment that isn't the last fragment
1757                                  * must have a length greater than 0 and it
1758                                  * must be an even multiple of 8.
1759                                  */
1760                                 fi->fi_flx |= FI_BAD;
1761                         }
1762                 }
1763         }
1764         fin->fin_off = off;
1765
1766         /*
1767          * Call per-protocol setup and checking
1768          */
1769         if (p == IPPROTO_AH) {
1770                 /*
1771                  * Treat AH differently because we expect there to be another
1772                  * layer 4 header after it.
1773                  */
1774                 p = ipf_pr_ah(fin);
1775         }
1776
1777         switch (p)
1778         {
1779         case IPPROTO_UDP :
1780                 ipf_pr_udp(fin);
1781                 break;
1782         case IPPROTO_TCP :
1783                 ipf_pr_tcp(fin);
1784                 break;
1785         case IPPROTO_ICMP :
1786                 ipf_pr_icmp(fin);
1787                 break;
1788         case IPPROTO_ESP :
1789                 ipf_pr_esp(fin);
1790                 break;
1791         case IPPROTO_GRE :
1792                 ipf_pr_gre(fin);
1793                 break;
1794         }
1795
1796         ip = fin->fin_ip;
1797         if (ip == NULL)
1798                 return;
1799
1800         /*
1801          * If it is a standard IP header (no options), set the flag fields
1802          * which relate to options to 0.
1803          */
1804         if (hlen == sizeof(*ip)) {
1805                 fi->fi_optmsk = 0;
1806                 fi->fi_secmsk = 0;
1807                 fi->fi_auth = 0;
1808                 return;
1809         }
1810
1811         /*
1812          * So the IP header has some IP options attached.  Walk the entire
1813          * list of options present with this packet and set flags to indicate
1814          * which ones are here and which ones are not.  For the somewhat out
1815          * of date and obscure security classification options, set a flag to
1816          * represent which classification is present.
1817          */
1818         fi->fi_flx |= FI_OPTIONS;
1819
1820         for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) {
1821                 opt = *s;
1822                 if (opt == '\0')
1823                         break;
1824                 else if (opt == IPOPT_NOP)
1825                         ol = 1;
1826                 else {
1827                         if (hlen < 2)
1828                                 break;
1829                         ol = (int)*(s + 1);
1830                         if (ol < 2 || ol > hlen)
1831                                 break;
1832                 }
1833                 for (i = 9, mv = 4; mv >= 0; ) {
1834                         op = ipopts + i;
1835
1836                         if ((opt == (u_char)op->ol_val) && (ol > 4)) {
1837                                 u_32_t doi;
1838
1839                                 switch (opt)
1840                                 {
1841                                 case IPOPT_SECURITY :
1842                                         if (optmsk & op->ol_bit) {
1843                                                 fin->fin_flx |= FI_BAD;
1844                                         } else {
1845                                                 doi = ipf_checkripso(s);
1846                                                 secmsk = doi >> 16;
1847                                                 auth = doi & 0xffff;
1848                                         }
1849                                         break;
1850
1851                                 case IPOPT_CIPSO :
1852
1853                                         if (optmsk & op->ol_bit) {
1854                                                 fin->fin_flx |= FI_BAD;
1855                                         } else {
1856                                                 doi = ipf_checkcipso(fin,
1857                                                                      s, ol);
1858                                                 secmsk = doi >> 16;
1859                                                 auth = doi & 0xffff;
1860                                         }
1861                                         break;
1862                                 }
1863                                 optmsk |= op->ol_bit;
1864                         }
1865
1866                         if (opt < op->ol_val)
1867                                 i -= mv;
1868                         else
1869                                 i += mv;
1870                         mv--;
1871                 }
1872                 hlen -= ol;
1873                 s += ol;
1874         }
1875
1876         /*
1877          *
1878          */
1879         if (auth && !(auth & 0x0100))
1880                 auth &= 0xff00;
1881         fi->fi_optmsk = optmsk;
1882         fi->fi_secmsk = secmsk;
1883         fi->fi_auth = auth;
1884 }
1885
1886
1887 /* ------------------------------------------------------------------------ */
1888 /* Function:    ipf_checkripso                                              */
1889 /* Returns:     void                                                        */
1890 /* Parameters:  s(I)   - pointer to start of RIPSO option                   */
1891 /*                                                                          */
1892 /* ------------------------------------------------------------------------ */
1893 static u_32_t
1894 ipf_checkripso(s)
1895         u_char *s;
1896 {
1897         const struct optlist *sp;
1898         u_short secmsk = 0, auth = 0;
1899         u_char sec;
1900         int j, m;
1901
1902         sec = *(s + 2); /* classification */
1903         for (j = 3, m = 2; m >= 0; ) {
1904                 sp = secopt + j;
1905                 if (sec == sp->ol_val) {
1906                         secmsk |= sp->ol_bit;
1907                         auth = *(s + 3);
1908                         auth *= 256;
1909                         auth += *(s + 4);
1910                         break;
1911                 }
1912                 if (sec < sp->ol_val)
1913                         j -= m;
1914                 else
1915                         j += m;
1916                 m--;
1917         }
1918
1919         return (secmsk << 16) | auth;
1920 }
1921
1922
1923 /* ------------------------------------------------------------------------ */
1924 /* Function:    ipf_checkcipso                                              */
1925 /* Returns:     u_32_t  - 0 = failure, else the doi from the header         */
1926 /* Parameters:  fin(IO) - pointer to packet information                     */
1927 /*              s(I)    - pointer to start of CIPSO option                  */
1928 /*              ol(I)   - length of CIPSO option field                      */
1929 /*                                                                          */
1930 /* This function returns the domain of integrity (DOI) field from the CIPSO */
1931 /* header and returns that whilst also storing the highest sensitivity      */
1932 /* value found in the fr_info_t structure.                                  */
1933 /*                                                                          */
1934 /* No attempt is made to extract the category bitmaps as these are defined  */
1935 /* by the user (rather than the protocol) and can be rather numerous on the */
1936 /* end nodes.                                                               */
1937 /* ------------------------------------------------------------------------ */
1938 static u_32_t
1939 ipf_checkcipso(fin, s, ol)
1940         fr_info_t *fin;
1941         u_char *s;
1942         int ol;
1943 {
1944         ipf_main_softc_t *softc = fin->fin_main_soft;
1945         fr_ip_t *fi;
1946         u_32_t doi;
1947         u_char *t, tag, tlen, sensitivity;
1948         int len;
1949
1950         if (ol < 6 || ol > 40) {
1951                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_cipso_bad);
1952                 fin->fin_flx |= FI_BAD;
1953                 return 0;
1954         }
1955
1956         fi = &fin->fin_fi;
1957         fi->fi_sensitivity = 0;
1958         /*
1959          * The DOI field MUST be there.
1960          */
1961         bcopy(s + 2, &doi, sizeof(doi));
1962
1963         t = (u_char *)s + 6;
1964         for (len = ol - 6; len >= 2; len -= tlen, t+= tlen) {
1965                 tag = *t;
1966                 tlen = *(t + 1);
1967                 if (tlen > len || tlen < 4 || tlen > 34) {
1968                         LBUMPD(ipf_stats[fin->fin_out], fr_v4_cipso_tlen);
1969                         fin->fin_flx |= FI_BAD;
1970                         return 0;
1971                 }
1972
1973                 sensitivity = 0;
1974                 /*
1975                  * Tag numbers 0, 1, 2, 5 are laid out in the CIPSO Internet
1976                  * draft (16 July 1992) that has expired.
1977                  */
1978                 if (tag == 0) {
1979                         fin->fin_flx |= FI_BAD;
1980                         continue;
1981                 } else if (tag == 1) {
1982                         if (*(t + 2) != 0) {
1983                                 fin->fin_flx |= FI_BAD;
1984                                 continue;
1985                         }
1986                         sensitivity = *(t + 3);
1987                         /* Category bitmap for categories 0-239 */
1988
1989                 } else if (tag == 4) {
1990                         if (*(t + 2) != 0) {
1991                                 fin->fin_flx |= FI_BAD;
1992                                 continue;
1993                         }
1994                         sensitivity = *(t + 3);
1995                         /* Enumerated categories, 16bits each, upto 15 */
1996
1997                 } else if (tag == 5) {
1998                         if (*(t + 2) != 0) {
1999                                 fin->fin_flx |= FI_BAD;
2000                                 continue;
2001                         }
2002                         sensitivity = *(t + 3);
2003                         /* Range of categories (2*16bits), up to 7 pairs */
2004
2005                 } else if (tag > 127) {
2006                         /* Custom defined DOI */
2007                         ;
2008                 } else {
2009                         fin->fin_flx |= FI_BAD;
2010                         continue;
2011                 }
2012
2013                 if (sensitivity > fi->fi_sensitivity)
2014                         fi->fi_sensitivity = sensitivity;
2015         }
2016
2017         return doi;
2018 }
2019
2020
2021 /* ------------------------------------------------------------------------ */
2022 /* Function:    ipf_makefrip                                                */
2023 /* Returns:     int     - 0 == packet ok, -1 == packet freed                */
2024 /* Parameters:  hlen(I) - length of IP packet header                        */
2025 /*              ip(I)   - pointer to the IP header                          */
2026 /*              fin(IO) - pointer to packet information                     */
2027 /*                                                                          */
2028 /* Compact the IP header into a structure which contains just the info.     */
2029 /* which is useful for comparing IP headers with and store this information */
2030 /* in the fr_info_t structure pointer to by fin.  At present, it is assumed */
2031 /* this function will be called with either an IPv4 or IPv6 packet.         */
2032 /* ------------------------------------------------------------------------ */
2033 int
2034 ipf_makefrip(hlen, ip, fin)
2035         int hlen;
2036         ip_t *ip;
2037         fr_info_t *fin;
2038 {
2039         ipf_main_softc_t *softc = fin->fin_main_soft;
2040         int v;
2041
2042         fin->fin_depth = 0;
2043         fin->fin_hlen = (u_short)hlen;
2044         fin->fin_ip = ip;
2045         fin->fin_rule = 0xffffffff;
2046         fin->fin_group[0] = -1;
2047         fin->fin_group[1] = '\0';
2048         fin->fin_dp = (char *)ip + hlen;
2049
2050         v = fin->fin_v;
2051         if (v == 4) {
2052                 fin->fin_plen = ntohs(ip->ip_len);
2053                 fin->fin_dlen = fin->fin_plen - hlen;
2054                 ipf_pr_ipv4hdr(fin);
2055 #ifdef  USE_INET6
2056         } else if (v == 6) {
2057                 fin->fin_plen = ntohs(((ip6_t *)ip)->ip6_plen);
2058                 fin->fin_dlen = fin->fin_plen;
2059                 fin->fin_plen += hlen;
2060
2061                 ipf_pr_ipv6hdr(fin);
2062 #endif
2063         }
2064         if (fin->fin_ip == NULL) {
2065                 LBUMP(ipf_stats[fin->fin_out].fr_ip_freed);
2066                 return -1;
2067         }
2068         return 0;
2069 }
2070
2071
2072 /* ------------------------------------------------------------------------ */
2073 /* Function:    ipf_portcheck                                               */
2074 /* Returns:     int - 1 == port matched, 0 == port match failed             */
2075 /* Parameters:  frp(I) - pointer to port check `expression'                 */
2076 /*              pop(I) - port number to evaluate                            */
2077 /*                                                                          */
2078 /* Perform a comparison of a port number against some other(s), using a     */
2079 /* structure with compare information stored in it.                         */
2080 /* ------------------------------------------------------------------------ */
2081 static INLINE int
2082 ipf_portcheck(frp, pop)
2083         frpcmp_t *frp;
2084         u_32_t pop;
2085 {
2086         int err = 1;
2087         u_32_t po;
2088
2089         po = frp->frp_port;
2090
2091         /*
2092          * Do opposite test to that required and continue if that succeeds.
2093          */
2094         switch (frp->frp_cmp)
2095         {
2096         case FR_EQUAL :
2097                 if (pop != po) /* EQUAL */
2098                         err = 0;
2099                 break;
2100         case FR_NEQUAL :
2101                 if (pop == po) /* NOTEQUAL */
2102                         err = 0;
2103                 break;
2104         case FR_LESST :
2105                 if (pop >= po) /* LESSTHAN */
2106                         err = 0;
2107                 break;
2108         case FR_GREATERT :
2109                 if (pop <= po) /* GREATERTHAN */
2110                         err = 0;
2111                 break;
2112         case FR_LESSTE :
2113                 if (pop > po) /* LT or EQ */
2114                         err = 0;
2115                 break;
2116         case FR_GREATERTE :
2117                 if (pop < po) /* GT or EQ */
2118                         err = 0;
2119                 break;
2120         case FR_OUTRANGE :
2121                 if (pop >= po && pop <= frp->frp_top) /* Out of range */
2122                         err = 0;
2123                 break;
2124         case FR_INRANGE :
2125                 if (pop <= po || pop >= frp->frp_top) /* In range */
2126                         err = 0;
2127                 break;
2128         case FR_INCRANGE :
2129                 if (pop < po || pop > frp->frp_top) /* Inclusive range */
2130                         err = 0;
2131                 break;
2132         default :
2133                 break;
2134         }
2135         return err;
2136 }
2137
2138
2139 /* ------------------------------------------------------------------------ */
2140 /* Function:    ipf_tcpudpchk                                               */
2141 /* Returns:     int - 1 == protocol matched, 0 == check failed              */
2142 /* Parameters:  fda(I) - pointer to packet information                      */
2143 /*              ft(I)  - pointer to structure with comparison data          */
2144 /*                                                                          */
2145 /* Compares the current pcket (assuming it is TCP/UDP) information with a   */
2146 /* structure containing information that we want to match against.          */
2147 /* ------------------------------------------------------------------------ */
2148 int
2149 ipf_tcpudpchk(fi, ft)
2150         fr_ip_t *fi;
2151         frtuc_t *ft;
2152 {
2153         int err = 1;
2154
2155         /*
2156          * Both ports should *always* be in the first fragment.
2157          * So far, I cannot find any cases where they can not be.
2158          *
2159          * compare destination ports
2160          */
2161         if (ft->ftu_dcmp)
2162                 err = ipf_portcheck(&ft->ftu_dst, fi->fi_ports[1]);
2163
2164         /*
2165          * compare source ports
2166          */
2167         if (err && ft->ftu_scmp)
2168                 err = ipf_portcheck(&ft->ftu_src, fi->fi_ports[0]);
2169
2170         /*
2171          * If we don't have all the TCP/UDP header, then how can we
2172          * expect to do any sort of match on it ?  If we were looking for
2173          * TCP flags, then NO match.  If not, then match (which should
2174          * satisfy the "short" class too).
2175          */
2176         if (err && (fi->fi_p == IPPROTO_TCP)) {
2177                 if (fi->fi_flx & FI_SHORT)
2178                         return !(ft->ftu_tcpf | ft->ftu_tcpfm);
2179                 /*
2180                  * Match the flags ?  If not, abort this match.
2181                  */
2182                 if (ft->ftu_tcpfm &&
2183                     ft->ftu_tcpf != (fi->fi_tcpf & ft->ftu_tcpfm)) {
2184                         FR_DEBUG(("f. %#x & %#x != %#x\n", fi->fi_tcpf,
2185                                  ft->ftu_tcpfm, ft->ftu_tcpf));
2186                         err = 0;
2187                 }
2188         }
2189         return err;
2190 }
2191
2192
2193 /* ------------------------------------------------------------------------ */
2194 /* Function:    ipf_check_ipf                                               */
2195 /* Returns:     int - 0 == match, else no match                             */
2196 /* Parameters:  fin(I)     - pointer to packet information                  */
2197 /*              fr(I)      - pointer to filter rule                         */
2198 /*              portcmp(I) - flag indicating whether to attempt matching on */
2199 /*                           TCP/UDP port data.                             */
2200 /*                                                                          */
2201 /* Check to see if a packet matches an IPFilter rule.  Checks of addresses, */
2202 /* port numbers, etc, for "standard" IPFilter rules are all orchestrated in */
2203 /* this function.                                                           */
2204 /* ------------------------------------------------------------------------ */
2205 static INLINE int
2206 ipf_check_ipf(fin, fr, portcmp)
2207         fr_info_t *fin;
2208         frentry_t *fr;
2209         int portcmp;
2210 {
2211         u_32_t  *ld, *lm, *lip;
2212         fripf_t *fri;
2213         fr_ip_t *fi;
2214         int i;
2215
2216         fi = &fin->fin_fi;
2217         fri = fr->fr_ipf;
2218         lip = (u_32_t *)fi;
2219         lm = (u_32_t *)&fri->fri_mip;
2220         ld = (u_32_t *)&fri->fri_ip;
2221
2222         /*
2223          * first 32 bits to check coversion:
2224          * IP version, TOS, TTL, protocol
2225          */
2226         i = ((*lip & *lm) != *ld);
2227         FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
2228                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2229         if (i)
2230                 return 1;
2231
2232         /*
2233          * Next 32 bits is a constructed bitmask indicating which IP options
2234          * are present (if any) in this packet.
2235          */
2236         lip++, lm++, ld++;
2237         i = ((*lip & *lm) != *ld);
2238         FR_DEBUG(("1. %#08x & %#08x != %#08x\n",
2239                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2240         if (i != 0)
2241                 return 1;
2242
2243         lip++, lm++, ld++;
2244         /*
2245          * Unrolled loops (4 each, for 32 bits) for address checks.
2246          */
2247         /*
2248          * Check the source address.
2249          */
2250         if (fr->fr_satype == FRI_LOOKUP) {
2251                 i = (*fr->fr_srcfunc)(fin->fin_main_soft, fr->fr_srcptr,
2252                                       fi->fi_v, lip, fin->fin_plen);
2253                 if (i == -1)
2254                         return 1;
2255                 lip += 3;
2256                 lm += 3;
2257                 ld += 3;
2258         } else {
2259                 i = ((*lip & *lm) != *ld);
2260                 FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
2261                            ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2262                 if (fi->fi_v == 6) {
2263                         lip++, lm++, ld++;
2264                         i |= ((*lip & *lm) != *ld);
2265                         FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
2266                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2267                         lip++, lm++, ld++;
2268                         i |= ((*lip & *lm) != *ld);
2269                         FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
2270                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2271                         lip++, lm++, ld++;
2272                         i |= ((*lip & *lm) != *ld);
2273                         FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
2274                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2275                 } else {
2276                         lip += 3;
2277                         lm += 3;
2278                         ld += 3;
2279                 }
2280         }
2281         i ^= (fr->fr_flags & FR_NOTSRCIP) >> 6;
2282         if (i != 0)
2283                 return 1;
2284
2285         /*
2286          * Check the destination address.
2287          */
2288         lip++, lm++, ld++;
2289         if (fr->fr_datype == FRI_LOOKUP) {
2290                 i = (*fr->fr_dstfunc)(fin->fin_main_soft, fr->fr_dstptr,
2291                                       fi->fi_v, lip, fin->fin_plen);
2292                 if (i == -1)
2293                         return 1;
2294                 lip += 3;
2295                 lm += 3;
2296                 ld += 3;
2297         } else {
2298                 i = ((*lip & *lm) != *ld);
2299                 FR_DEBUG(("3a. %#08x & %#08x != %#08x\n",
2300                            ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2301                 if (fi->fi_v == 6) {
2302                         lip++, lm++, ld++;
2303                         i |= ((*lip & *lm) != *ld);
2304                         FR_DEBUG(("3b. %#08x & %#08x != %#08x\n",
2305                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2306                         lip++, lm++, ld++;
2307                         i |= ((*lip & *lm) != *ld);
2308                         FR_DEBUG(("3c. %#08x & %#08x != %#08x\n",
2309                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2310                         lip++, lm++, ld++;
2311                         i |= ((*lip & *lm) != *ld);
2312                         FR_DEBUG(("3d. %#08x & %#08x != %#08x\n",
2313                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2314                 } else {
2315                         lip += 3;
2316                         lm += 3;
2317                         ld += 3;
2318                 }
2319         }
2320         i ^= (fr->fr_flags & FR_NOTDSTIP) >> 7;
2321         if (i != 0)
2322                 return 1;
2323         /*
2324          * IP addresses matched.  The next 32bits contains:
2325          * mast of old IP header security & authentication bits.
2326          */
2327         lip++, lm++, ld++;
2328         i = (*ld - (*lip & *lm));
2329         FR_DEBUG(("4. %#08x & %#08x != %#08x\n", *lip, *lm, *ld));
2330
2331         /*
2332          * Next we have 32 bits of packet flags.
2333          */
2334         lip++, lm++, ld++;
2335         i |= (*ld - (*lip & *lm));
2336         FR_DEBUG(("5. %#08x & %#08x != %#08x\n", *lip, *lm, *ld));
2337
2338         if (i == 0) {
2339                 /*
2340                  * If a fragment, then only the first has what we're
2341                  * looking for here...
2342                  */
2343                 if (portcmp) {
2344                         if (!ipf_tcpudpchk(&fin->fin_fi, &fr->fr_tuc))
2345                                 i = 1;
2346                 } else {
2347                         if (fr->fr_dcmp || fr->fr_scmp ||
2348                             fr->fr_tcpf || fr->fr_tcpfm)
2349                                 i = 1;
2350                         if (fr->fr_icmpm || fr->fr_icmp) {
2351                                 if (((fi->fi_p != IPPROTO_ICMP) &&
2352                                      (fi->fi_p != IPPROTO_ICMPV6)) ||
2353                                     fin->fin_off || (fin->fin_dlen < 2))
2354                                         i = 1;
2355                                 else if ((fin->fin_data[0] & fr->fr_icmpm) !=
2356                                          fr->fr_icmp) {
2357                                         FR_DEBUG(("i. %#x & %#x != %#x\n",
2358                                                  fin->fin_data[0],
2359                                                  fr->fr_icmpm, fr->fr_icmp));
2360                                         i = 1;
2361                                 }
2362                         }
2363                 }
2364         }
2365         return i;
2366 }
2367
2368
2369 /* ------------------------------------------------------------------------ */
2370 /* Function:    ipf_scanlist                                                */
2371 /* Returns:     int - result flags of scanning filter list                  */
2372 /* Parameters:  fin(I) - pointer to packet information                      */
2373 /*              pass(I) - default result to return for filtering            */
2374 /*                                                                          */
2375 /* Check the input/output list of rules for a match to the current packet.  */
2376 /* If a match is found, the value of fr_flags from the rule becomes the     */
2377 /* return value and fin->fin_fr points to the matched rule.                 */
2378 /*                                                                          */
2379 /* This function may be called recusively upto 16 times (limit inbuilt.)    */
2380 /* When unwinding, it should finish up with fin_depth as 0.                 */
2381 /*                                                                          */
2382 /* Could be per interface, but this gets real nasty when you don't have,    */
2383 /* or can't easily change, the kernel source code to .                      */
2384 /* ------------------------------------------------------------------------ */
2385 int
2386 ipf_scanlist(fin, pass)
2387         fr_info_t *fin;
2388         u_32_t pass;
2389 {
2390         ipf_main_softc_t *softc = fin->fin_main_soft;
2391         int rulen, portcmp, off, skip;
2392         struct frentry *fr, *fnext;
2393         u_32_t passt, passo;
2394
2395         /*
2396          * Do not allow nesting deeper than 16 levels.
2397          */
2398         if (fin->fin_depth >= 16)
2399                 return pass;
2400
2401         fr = fin->fin_fr;
2402
2403         /*
2404          * If there are no rules in this list, return now.
2405          */
2406         if (fr == NULL)
2407                 return pass;
2408
2409         skip = 0;
2410         portcmp = 0;
2411         fin->fin_depth++;
2412         fin->fin_fr = NULL;
2413         off = fin->fin_off;
2414
2415         if ((fin->fin_flx & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
2416                 portcmp = 1;
2417
2418         for (rulen = 0; fr; fr = fnext, rulen++) {
2419                 fnext = fr->fr_next;
2420                 if (skip != 0) {
2421                         FR_VERBOSE(("SKIP %d (%#x)\n", skip, fr->fr_flags));
2422                         skip--;
2423                         continue;
2424                 }
2425
2426                 /*
2427                  * In all checks below, a null (zero) value in the
2428                  * filter struture is taken to mean a wildcard.
2429                  *
2430                  * check that we are working for the right interface
2431                  */
2432 #ifdef  _KERNEL
2433                 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
2434                         continue;
2435 #else
2436                 if (opts & (OPT_VERBOSE|OPT_DEBUG))
2437                         printf("\n");
2438                 FR_VERBOSE(("%c", FR_ISSKIP(pass) ? 's' :
2439                                   FR_ISPASS(pass) ? 'p' :
2440                                   FR_ISACCOUNT(pass) ? 'A' :
2441                                   FR_ISAUTH(pass) ? 'a' :
2442                                   (pass & FR_NOMATCH) ? 'n' :'b'));
2443                 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
2444                         continue;
2445                 FR_VERBOSE((":i"));
2446 #endif
2447
2448                 switch (fr->fr_type)
2449                 {
2450                 case FR_T_IPF :
2451                 case FR_T_IPF_BUILTIN :
2452                         if (ipf_check_ipf(fin, fr, portcmp))
2453                                 continue;
2454                         break;
2455 #if defined(IPFILTER_BPF)
2456                 case FR_T_BPFOPC :
2457                 case FR_T_BPFOPC_BUILTIN :
2458                     {
2459                         u_char *mc;
2460                         int wlen;
2461
2462                         if (*fin->fin_mp == NULL)
2463                                 continue;
2464                         if (fin->fin_family != fr->fr_family)
2465                                 continue;
2466                         mc = (u_char *)fin->fin_m;
2467                         wlen = fin->fin_dlen + fin->fin_hlen;
2468                         if (!bpf_filter(fr->fr_data, mc, wlen, 0))
2469                                 continue;
2470                         break;
2471                     }
2472 #endif
2473                 case FR_T_CALLFUNC_BUILTIN :
2474                     {
2475                         frentry_t *f;
2476
2477                         f = (*fr->fr_func)(fin, &pass);
2478                         if (f != NULL)
2479                                 fr = f;
2480                         else
2481                                 continue;
2482                         break;
2483                     }
2484
2485                 case FR_T_IPFEXPR :
2486                 case FR_T_IPFEXPR_BUILTIN :
2487                         if (fin->fin_family != fr->fr_family)
2488                                 continue;
2489                         if (ipf_fr_matcharray(fin, fr->fr_data) == 0)
2490                                 continue;
2491                         break;
2492
2493                 default :
2494                         break;
2495                 }
2496
2497                 if ((fin->fin_out == 0) && (fr->fr_nattag.ipt_num[0] != 0)) {
2498                         if (fin->fin_nattag == NULL)
2499                                 continue;
2500                         if (ipf_matchtag(&fr->fr_nattag, fin->fin_nattag) == 0)
2501                                 continue;
2502                 }
2503                 FR_VERBOSE(("=%d/%d.%d *", fr->fr_grhead, fr->fr_group, rulen));
2504
2505                 passt = fr->fr_flags;
2506
2507                 /*
2508                  * If the rule is a "call now" rule, then call the function
2509                  * in the rule, if it exists and use the results from that.
2510                  * If the function pointer is bad, just make like we ignore
2511                  * it, except for increasing the hit counter.
2512                  */
2513                 if ((passt & FR_CALLNOW) != 0) {
2514                         frentry_t *frs;
2515
2516                         ATOMIC_INC64(fr->fr_hits);
2517                         if ((fr->fr_func == NULL) ||
2518                             (fr->fr_func == (ipfunc_t)-1))
2519                                 continue;
2520
2521                         frs = fin->fin_fr;
2522                         fin->fin_fr = fr;
2523                         fr = (*fr->fr_func)(fin, &passt);
2524                         if (fr == NULL) {
2525                                 fin->fin_fr = frs;
2526                                 continue;
2527                         }
2528                         passt = fr->fr_flags;
2529                 }
2530                 fin->fin_fr = fr;
2531
2532 #ifdef  IPFILTER_LOG
2533                 /*
2534                  * Just log this packet...
2535                  */
2536                 if ((passt & FR_LOGMASK) == FR_LOG) {
2537                         if (ipf_log_pkt(fin, passt) == -1) {
2538                                 if (passt & FR_LOGORBLOCK) {
2539                                         DT(frb_logfail);
2540                                         passt &= ~FR_CMDMASK;
2541                                         passt |= FR_BLOCK|FR_QUICK;
2542                                         fin->fin_reason = FRB_LOGFAIL;
2543                                 }
2544                         }
2545                 }
2546 #endif /* IPFILTER_LOG */
2547
2548                 MUTEX_ENTER(&fr->fr_lock);
2549                 fr->fr_bytes += (U_QUAD_T)fin->fin_plen;
2550                 fr->fr_hits++;
2551                 MUTEX_EXIT(&fr->fr_lock);
2552                 fin->fin_rule = rulen;
2553
2554                 passo = pass;
2555                 if (FR_ISSKIP(passt)) {
2556                         skip = fr->fr_arg;
2557                         continue;
2558                 } else if (((passt & FR_LOGMASK) != FR_LOG) &&
2559                            ((passt & FR_LOGMASK) != FR_DECAPSULATE)) {
2560                         pass = passt;
2561                 }
2562
2563                 if (passt & (FR_RETICMP|FR_FAKEICMP))
2564                         fin->fin_icode = fr->fr_icode;
2565
2566                 if (fr->fr_group != -1) {
2567                         (void) strncpy(fin->fin_group,
2568                                        FR_NAME(fr, fr_group),
2569                                        strlen(FR_NAME(fr, fr_group)));
2570                 } else {
2571                         fin->fin_group[0] = '\0';
2572                 }
2573
2574                 FR_DEBUG(("pass %#x/%#x/%x\n", passo, pass, passt));
2575
2576                 if (fr->fr_grphead != NULL) {
2577                         fin->fin_fr = fr->fr_grphead->fg_start;
2578                         FR_VERBOSE(("group %s\n", FR_NAME(fr, fr_grhead)));
2579
2580                         if (FR_ISDECAPS(passt))
2581                                 passt = ipf_decaps(fin, pass, fr->fr_icode);
2582                         else
2583                                 passt = ipf_scanlist(fin, pass);
2584
2585                         if (fin->fin_fr == NULL) {
2586                                 fin->fin_rule = rulen;
2587                                 if (fr->fr_group != -1)
2588                                         (void) strncpy(fin->fin_group,
2589                                                        fr->fr_names +
2590                                                        fr->fr_group,
2591                                                        strlen(fr->fr_names +
2592                                                               fr->fr_group));
2593                                 fin->fin_fr = fr;
2594                                 passt = pass;
2595                         }
2596                         pass = passt;
2597                 }
2598
2599                 if (pass & FR_QUICK) {
2600                         /*
2601                          * Finally, if we've asked to track state for this
2602                          * packet, set it up.  Add state for "quick" rules
2603                          * here so that if the action fails we can consider
2604                          * the rule to "not match" and keep on processing
2605                          * filter rules.
2606                          */
2607                         if ((pass & FR_KEEPSTATE) && !FR_ISAUTH(pass) &&
2608                             !(fin->fin_flx & FI_STATE)) {
2609                                 int out = fin->fin_out;
2610
2611                                 fin->fin_fr = fr;
2612                                 if (ipf_state_add(softc, fin, NULL, 0) == 0) {
2613                                         LBUMPD(ipf_stats[out], fr_ads);
2614                                 } else {
2615                                         LBUMPD(ipf_stats[out], fr_bads);
2616                                         pass = passo;
2617                                         continue;
2618                                 }
2619                         }
2620                         break;
2621                 }
2622         }
2623         fin->fin_depth--;
2624         return pass;
2625 }
2626
2627
2628 /* ------------------------------------------------------------------------ */
2629 /* Function:    ipf_acctpkt                                                 */
2630 /* Returns:     frentry_t* - always returns NULL                            */
2631 /* Parameters:  fin(I) - pointer to packet information                      */
2632 /*              passp(IO) - pointer to current/new filter decision (unused) */
2633 /*                                                                          */
2634 /* Checks a packet against accounting rules, if there are any for the given */
2635 /* IP protocol version.                                                     */
2636 /*                                                                          */
2637 /* N.B.: this function returns NULL to match the prototype used by other    */
2638 /* functions called from the IPFilter "mainline" in ipf_check().            */
2639 /* ------------------------------------------------------------------------ */
2640 frentry_t *
2641 ipf_acctpkt(fin, passp)
2642         fr_info_t *fin;
2643         u_32_t *passp;
2644 {
2645         ipf_main_softc_t *softc = fin->fin_main_soft;
2646         char group[FR_GROUPLEN];
2647         frentry_t *fr, *frsave;
2648         u_32_t pass, rulen;
2649
2650         passp = passp;
2651         fr = softc->ipf_acct[fin->fin_out][softc->ipf_active];
2652
2653         if (fr != NULL) {
2654                 frsave = fin->fin_fr;
2655                 bcopy(fin->fin_group, group, FR_GROUPLEN);
2656                 rulen = fin->fin_rule;
2657                 fin->fin_fr = fr;
2658                 pass = ipf_scanlist(fin, FR_NOMATCH);
2659                 if (FR_ISACCOUNT(pass)) {
2660                         LBUMPD(ipf_stats[0], fr_acct);
2661                 }
2662                 fin->fin_fr = frsave;
2663                 bcopy(group, fin->fin_group, FR_GROUPLEN);
2664                 fin->fin_rule = rulen;
2665         }
2666         return NULL;
2667 }
2668
2669
2670 /* ------------------------------------------------------------------------ */
2671 /* Function:    ipf_firewall                                                */
2672 /* Returns:     frentry_t* - returns pointer to matched rule, if no matches */
2673 /*                           were found, returns NULL.                      */
2674 /* Parameters:  fin(I) - pointer to packet information                      */
2675 /*              passp(IO) - pointer to current/new filter decision (unused) */
2676 /*                                                                          */
2677 /* Applies an appropriate set of firewall rules to the packet, to see if    */
2678 /* there are any matches.  The first check is to see if a match can be seen */
2679 /* in the cache.  If not, then search an appropriate list of rules.  Once a */
2680 /* matching rule is found, take any appropriate actions as defined by the   */
2681 /* rule - except logging.                                                   */
2682 /* ------------------------------------------------------------------------ */
2683 static frentry_t *
2684 ipf_firewall(fin, passp)
2685         fr_info_t *fin;
2686         u_32_t *passp;
2687 {
2688         ipf_main_softc_t *softc = fin->fin_main_soft;
2689         frentry_t *fr;
2690         u_32_t pass;
2691         int out;
2692
2693         out = fin->fin_out;
2694         pass = *passp;
2695
2696         /*
2697          * This rule cache will only affect packets that are not being
2698          * statefully filtered.
2699          */
2700         fin->fin_fr = softc->ipf_rules[out][softc->ipf_active];
2701         if (fin->fin_fr != NULL)
2702                 pass = ipf_scanlist(fin, softc->ipf_pass);
2703
2704         if ((pass & FR_NOMATCH)) {
2705                 LBUMPD(ipf_stats[out], fr_nom);
2706         }
2707         fr = fin->fin_fr;
2708
2709         /*
2710          * Apply packets per second rate-limiting to a rule as required.
2711          */
2712         if ((fr != NULL) && (fr->fr_pps != 0) &&
2713             !ppsratecheck(&fr->fr_lastpkt, &fr->fr_curpps, fr->fr_pps)) {
2714                 DT2(frb_ppsrate, fr_info_t *, fin, frentry_t *, fr);
2715                 pass &= ~(FR_CMDMASK|FR_RETICMP|FR_RETRST);
2716                 pass |= FR_BLOCK;
2717                 LBUMPD(ipf_stats[out], fr_ppshit);
2718                 fin->fin_reason = FRB_PPSRATE;
2719         }
2720
2721         /*
2722          * If we fail to add a packet to the authorization queue, then we
2723          * drop the packet later.  However, if it was added then pretend
2724          * we've dropped it already.
2725          */
2726         if (FR_ISAUTH(pass)) {
2727                 if (ipf_auth_new(fin->fin_m, fin) != 0) {
2728                         DT1(frb_authnew, fr_info_t *, fin);
2729                         fin->fin_m = *fin->fin_mp = NULL;
2730                         fin->fin_reason = FRB_AUTHNEW;
2731                         fin->fin_error = 0;
2732                 } else {
2733                         IPFERROR(1);
2734                         fin->fin_error = ENOSPC;
2735                 }
2736         }
2737
2738         if ((fr != NULL) && (fr->fr_func != NULL) &&
2739             (fr->fr_func != (ipfunc_t)-1) && !(pass & FR_CALLNOW))
2740                 (void) (*fr->fr_func)(fin, &pass);
2741
2742         /*
2743          * If a rule is a pre-auth rule, check again in the list of rules
2744          * loaded for authenticated use.  It does not particulary matter
2745          * if this search fails because a "preauth" result, from a rule,
2746          * is treated as "not a pass", hence the packet is blocked.
2747          */
2748         if (FR_ISPREAUTH(pass)) {
2749                 pass = ipf_auth_pre_scanlist(softc, fin, pass);
2750         }
2751
2752         /*
2753          * If the rule has "keep frag" and the packet is actually a fragment,
2754          * then create a fragment state entry.
2755          */
2756         if (pass & FR_KEEPFRAG) {
2757                 if (fin->fin_flx & FI_FRAG) {
2758                         if (ipf_frag_new(softc, fin, pass) == -1) {
2759                                 LBUMP(ipf_stats[out].fr_bnfr);
2760                         } else {
2761                                 LBUMP(ipf_stats[out].fr_nfr);
2762                         }
2763                 } else {
2764                         LBUMP(ipf_stats[out].fr_cfr);
2765                 }
2766         }
2767
2768         fr = fin->fin_fr;
2769         *passp = pass;
2770
2771         return fr;
2772 }
2773
2774
2775 /* ------------------------------------------------------------------------ */
2776 /* Function:    ipf_check                                                   */
2777 /* Returns:     int -  0 == packet allowed through,                         */
2778 /*              User space:                                                 */
2779 /*                    -1 == packet blocked                                  */
2780 /*                     1 == packet not matched                              */
2781 /*                    -2 == requires authentication                         */
2782 /*              Kernel:                                                     */
2783 /*                   > 0 == filter error # for packet                       */
2784 /* Parameters: ip(I)   - pointer to start of IPv4/6 packet                  */
2785 /*             hlen(I) - length of header                                   */
2786 /*             ifp(I)  - pointer to interface this packet is on             */
2787 /*             out(I)  - 0 == packet going in, 1 == packet going out        */
2788 /*             mp(IO)  - pointer to caller's buffer pointer that holds this */
2789 /*                       IP packet.                                         */
2790 /* Solaris & HP-UX ONLY :                                                   */
2791 /*             qpi(I)  - pointer to STREAMS queue information for this      */
2792 /*                       interface & direction.                             */
2793 /*                                                                          */
2794 /* ipf_check() is the master function for all IPFilter packet processing.   */
2795 /* It orchestrates: Network Address Translation (NAT), checking for packet  */
2796 /* authorisation (or pre-authorisation), presence of related state info.,   */
2797 /* generating log entries, IP packet accounting, routing of packets as      */
2798 /* directed by firewall rules and of course whether or not to allow the     */
2799 /* packet to be further processed by the kernel.                            */
2800 /*                                                                          */
2801 /* For packets blocked, the contents of "mp" will be NULL'd and the buffer  */
2802 /* freed.  Packets passed may be returned with the pointer pointed to by    */
2803 /* by "mp" changed to a new buffer.                                         */
2804 /* ------------------------------------------------------------------------ */
2805 int
2806 ipf_check(ctx, ip, hlen, ifp, out
2807 #if defined(_KERNEL) && defined(MENTAT)
2808         , qif, mp)
2809         void *qif;
2810 #else
2811         , mp)
2812 #endif
2813         mb_t **mp;
2814         ip_t *ip;
2815         int hlen;
2816         void *ifp;
2817         int out;
2818         void *ctx;
2819 {
2820         /*
2821          * The above really sucks, but short of writing a diff
2822          */
2823         ipf_main_softc_t *softc = ctx;
2824         fr_info_t frinfo;
2825         fr_info_t *fin = &frinfo;
2826         u_32_t pass = softc->ipf_pass;
2827         frentry_t *fr = NULL;
2828         int v = IP_V(ip);
2829         mb_t *mc = NULL;
2830         mb_t *m;
2831         /*
2832          * The first part of ipf_check() deals with making sure that what goes
2833          * into the filtering engine makes some sense.  Information about the
2834          * the packet is distilled, collected into a fr_info_t structure and
2835          * the an attempt to ensure the buffer the packet is in is big enough
2836          * to hold all the required packet headers.
2837          */
2838 #ifdef  _KERNEL
2839 # ifdef MENTAT
2840         qpktinfo_t *qpi = qif;
2841
2842 #  ifdef __sparc
2843         if ((u_int)ip & 0x3)
2844                 return 2;
2845 #  endif
2846 # else
2847         SPL_INT(s);
2848 # endif
2849
2850         if (softc->ipf_running <= 0) {
2851                 return 0;
2852         }
2853
2854         bzero((char *)fin, sizeof(*fin));
2855
2856 # ifdef MENTAT
2857         if (qpi->qpi_flags & QF_BROADCAST)
2858                 fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
2859         if (qpi->qpi_flags & QF_MULTICAST)
2860                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2861         m = qpi->qpi_m;
2862         fin->fin_qfm = m;
2863         fin->fin_qpi = qpi;
2864 # else /* MENTAT */
2865
2866         m = *mp;
2867
2868 #  if defined(M_MCAST)
2869         if ((m->m_flags & M_MCAST) != 0)
2870                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2871 #  endif
2872 #  if defined(M_MLOOP)
2873         if ((m->m_flags & M_MLOOP) != 0)
2874                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2875 #  endif
2876 #  if defined(M_BCAST)
2877         if ((m->m_flags & M_BCAST) != 0)
2878                 fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
2879 #  endif
2880 #  ifdef M_CANFASTFWD
2881         /*
2882          * XXX For now, IP Filter and fast-forwarding of cached flows
2883          * XXX are mutually exclusive.  Eventually, IP Filter should
2884          * XXX get a "can-fast-forward" filter rule.
2885          */
2886         m->m_flags &= ~M_CANFASTFWD;
2887 #  endif /* M_CANFASTFWD */
2888 #  if defined(CSUM_DELAY_DATA) && (!defined(__FreeBSD_version) || \
2889                                    (__FreeBSD_version < 501108))
2890         /*
2891          * disable delayed checksums.
2892          */
2893         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
2894                 in_delayed_cksum(m);
2895                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
2896         }
2897 #  endif /* CSUM_DELAY_DATA */
2898 # endif /* MENTAT */
2899 #else
2900         bzero((char *)fin, sizeof(*fin));
2901         m = *mp;
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 #endif /* _KERNEL */
2915
2916         fin->fin_v = v;
2917         fin->fin_m = m;
2918         fin->fin_ip = ip;
2919         fin->fin_mp = mp;
2920         fin->fin_out = out;
2921         fin->fin_ifp = ifp;
2922         fin->fin_error = ENETUNREACH;
2923         fin->fin_hlen = (u_short)hlen;
2924         fin->fin_dp = (char *)ip + hlen;
2925         fin->fin_main_soft = softc;
2926
2927         fin->fin_ipoff = (char *)ip - MTOD(m, char *);
2928
2929         SPL_NET(s);
2930
2931 #ifdef  USE_INET6
2932         if (v == 6) {
2933                 LBUMP(ipf_stats[out].fr_ipv6);
2934                 /*
2935                  * Jumbo grams are quite likely too big for internal buffer
2936                  * structures to handle comfortably, for now, so just drop
2937                  * them.
2938                  */
2939                 if (((ip6_t *)ip)->ip6_plen == 0) {
2940                         DT1(frb_jumbo, ip6_t *, (ip6_t *)ip);
2941                         pass = FR_BLOCK|FR_NOMATCH;
2942                         fin->fin_reason = FRB_JUMBO;
2943                         goto finished;
2944                 }
2945                 fin->fin_family = AF_INET6;
2946         } else
2947 #endif
2948         {
2949                 fin->fin_family = AF_INET;
2950         }
2951
2952         if (ipf_makefrip(hlen, ip, fin) == -1) {
2953                 DT1(frb_makefrip, fr_info_t *, fin);
2954                 pass = FR_BLOCK|FR_NOMATCH;
2955                 fin->fin_reason = FRB_MAKEFRIP;
2956                 goto finished;
2957         }
2958
2959         /*
2960          * For at least IPv6 packets, if a m_pullup() fails then this pointer
2961          * becomes NULL and so we have no packet to free.
2962          */
2963         if (*fin->fin_mp == NULL)
2964                 goto finished;
2965
2966         if (!out) {
2967                 if (v == 4) {
2968                         if (softc->ipf_chksrc && !ipf_verifysrc(fin)) {
2969                                 LBUMPD(ipf_stats[0], fr_v4_badsrc);
2970                                 fin->fin_flx |= FI_BADSRC;
2971                         }
2972                         if (fin->fin_ip->ip_ttl < softc->ipf_minttl) {
2973                                 LBUMPD(ipf_stats[0], fr_v4_badttl);
2974                                 fin->fin_flx |= FI_LOWTTL;
2975                         }
2976                 }
2977 #ifdef USE_INET6
2978                 else  if (v == 6) {
2979                         if (((ip6_t *)ip)->ip6_hlim < softc->ipf_minttl) {
2980                                 LBUMPD(ipf_stats[0], fr_v6_badttl);
2981                                 fin->fin_flx |= FI_LOWTTL;
2982                         }
2983                 }
2984 #endif
2985         }
2986
2987         if (fin->fin_flx & FI_SHORT) {
2988                 LBUMPD(ipf_stats[out], fr_short);
2989         }
2990
2991         READ_ENTER(&softc->ipf_mutex);
2992
2993         if (!out) {
2994                 switch (fin->fin_v)
2995                 {
2996                 case 4 :
2997                         if (ipf_nat_checkin(fin, &pass) == -1) {
2998                                 goto filterdone;
2999                         }
3000                         break;
3001 #ifdef USE_INET6
3002                 case 6 :
3003                         if (ipf_nat6_checkin(fin, &pass) == -1) {
3004                                 goto filterdone;
3005                         }
3006                         break;
3007 #endif
3008                 default :
3009                         break;
3010                 }
3011         }
3012         /*
3013          * Check auth now.
3014          * If a packet is found in the auth table, then skip checking
3015          * the access lists for permission but we do need to consider
3016          * the result as if it were from the ACL's.  In addition, being
3017          * found in the auth table means it has been seen before, so do
3018          * not pass it through accounting (again), lest it be counted twice.
3019          */
3020         fr = ipf_auth_check(fin, &pass);
3021         if (!out && (fr == NULL))
3022                 (void) ipf_acctpkt(fin, NULL);
3023
3024         if (fr == NULL) {
3025                 if ((fin->fin_flx & FI_FRAG) != 0)
3026                         fr = ipf_frag_known(fin, &pass);
3027
3028                 if (fr == NULL)
3029                         fr = ipf_state_check(fin, &pass);
3030         }
3031
3032         if ((pass & FR_NOMATCH) || (fr == NULL))
3033                 fr = ipf_firewall(fin, &pass);
3034
3035         /*
3036          * If we've asked to track state for this packet, set it up.
3037          * Here rather than ipf_firewall because ipf_checkauth may decide
3038          * to return a packet for "keep state"
3039          */
3040         if ((pass & FR_KEEPSTATE) && (fin->fin_m != NULL) &&
3041             !(fin->fin_flx & FI_STATE)) {
3042                 if (ipf_state_add(softc, fin, NULL, 0) == 0) {
3043                         LBUMP(ipf_stats[out].fr_ads);
3044                 } else {
3045                         LBUMP(ipf_stats[out].fr_bads);
3046                         if (FR_ISPASS(pass)) {
3047                                 DT(frb_stateadd);
3048                                 pass &= ~FR_CMDMASK;
3049                                 pass |= FR_BLOCK;
3050                                 fin->fin_reason = FRB_STATEADD;
3051                         }
3052                 }
3053         }
3054
3055         fin->fin_fr = fr;
3056         if ((fr != NULL) && !(fin->fin_flx & FI_STATE)) {
3057                 fin->fin_dif = &fr->fr_dif;
3058                 fin->fin_tif = &fr->fr_tifs[fin->fin_rev];
3059         }
3060
3061         /*
3062          * Only count/translate packets which will be passed on, out the
3063          * interface.
3064          */
3065         if (out && FR_ISPASS(pass)) {
3066                 (void) ipf_acctpkt(fin, NULL);
3067
3068                 switch (fin->fin_v)
3069                 {
3070                 case 4 :
3071                         if (ipf_nat_checkout(fin, &pass) == -1) {
3072                                 ;
3073                         } else if ((softc->ipf_update_ipid != 0) && (v == 4)) {
3074                                 if (ipf_updateipid(fin) == -1) {
3075                                         DT(frb_updateipid);
3076                                         LBUMP(ipf_stats[1].fr_ipud);
3077                                         pass &= ~FR_CMDMASK;
3078                                         pass |= FR_BLOCK;
3079                                         fin->fin_reason = FRB_UPDATEIPID;
3080                                 } else {
3081                                         LBUMP(ipf_stats[0].fr_ipud);
3082                                 }
3083                         }
3084                         break;
3085 #ifdef USE_INET6
3086                 case 6 :
3087                         (void) ipf_nat6_checkout(fin, &pass);
3088                         break;
3089 #endif
3090                 default :
3091                         break;
3092                 }
3093         }
3094
3095 filterdone:
3096 #ifdef  IPFILTER_LOG
3097         if ((softc->ipf_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
3098                 (void) ipf_dolog(fin, &pass);
3099         }
3100 #endif
3101
3102         /*
3103          * The FI_STATE flag is cleared here so that calling ipf_state_check
3104          * will work when called from inside of fr_fastroute.  Although
3105          * there is a similar flag, FI_NATED, for NAT, it does have the same
3106          * impact on code execution.
3107          */
3108         fin->fin_flx &= ~FI_STATE;
3109
3110 #if defined(FASTROUTE_RECURSION)
3111         /*
3112          * Up the reference on fr_lock and exit ipf_mutex. The generation of
3113          * a packet below can sometimes cause a recursive call into IPFilter.
3114          * On those platforms where that does happen, we need to hang onto
3115          * the filter rule just in case someone decides to remove or flush it
3116          * in the meantime.
3117          */
3118         if (fr != NULL) {
3119                 MUTEX_ENTER(&fr->fr_lock);
3120                 fr->fr_ref++;
3121                 MUTEX_EXIT(&fr->fr_lock);
3122         }
3123
3124         RWLOCK_EXIT(&softc->ipf_mutex);
3125 #endif
3126
3127         if ((pass & FR_RETMASK) != 0) {
3128                 /*
3129                  * Should we return an ICMP packet to indicate error
3130                  * status passing through the packet filter ?
3131                  * WARNING: ICMP error packets AND TCP RST packets should
3132                  * ONLY be sent in repsonse to incoming packets.  Sending
3133                  * them in response to outbound packets can result in a
3134                  * panic on some operating systems.
3135                  */
3136                 if (!out) {
3137                         if (pass & FR_RETICMP) {
3138                                 int dst;
3139
3140                                 if ((pass & FR_RETMASK) == FR_FAKEICMP)
3141                                         dst = 1;
3142                                 else
3143                                         dst = 0;
3144                                 (void) ipf_send_icmp_err(ICMP_UNREACH, fin,
3145                                                          dst);
3146                                 LBUMP(ipf_stats[0].fr_ret);
3147                         } else if (((pass & FR_RETMASK) == FR_RETRST) &&
3148                                    !(fin->fin_flx & FI_SHORT)) {
3149                                 if (((fin->fin_flx & FI_OOW) != 0) ||
3150                                     (ipf_send_reset(fin) == 0)) {
3151                                         LBUMP(ipf_stats[1].fr_ret);
3152                                 }
3153                         }
3154
3155                         /*
3156                          * When using return-* with auth rules, the auth code
3157                          * takes over disposing of this packet.
3158                          */
3159                         if (FR_ISAUTH(pass) && (fin->fin_m != NULL)) {
3160                                 DT1(frb_authcapture, fr_info_t *, fin);
3161                                 fin->fin_m = *fin->fin_mp = NULL;
3162                                 fin->fin_reason = FRB_AUTHCAPTURE;
3163                                 m = NULL;
3164                         }
3165                 } else {
3166                         if (pass & FR_RETRST) {
3167                                 fin->fin_error = ECONNRESET;
3168                         }
3169                 }
3170         }
3171
3172         /*
3173          * After the above so that ICMP unreachables and TCP RSTs get
3174          * created properly.
3175          */
3176         if (FR_ISBLOCK(pass) && (fin->fin_flx & FI_NEWNAT))
3177                 ipf_nat_uncreate(fin);
3178
3179         /*
3180          * If we didn't drop off the bottom of the list of rules (and thus
3181          * the 'current' rule fr is not NULL), then we may have some extra
3182          * instructions about what to do with a packet.
3183          * Once we're finished return to our caller, freeing the packet if
3184          * we are dropping it.
3185          */
3186         if (fr != NULL) {
3187                 frdest_t *fdp;
3188
3189                 /*
3190                  * Generate a duplicated packet first because ipf_fastroute
3191                  * can lead to fin_m being free'd... not good.
3192                  */
3193                 fdp = fin->fin_dif;
3194                 if ((fdp != NULL) && (fdp->fd_ptr != NULL) &&
3195                     (fdp->fd_ptr != (void *)-1)) {
3196                         mc = M_COPY(fin->fin_m);
3197                         if (mc != NULL)
3198                                 ipf_fastroute(mc, &mc, fin, fdp);
3199                 }
3200
3201                 fdp = fin->fin_tif;
3202                 if (!out && (pass & FR_FASTROUTE)) {
3203                         /*
3204                          * For fastroute rule, no destination interface defined
3205                          * so pass NULL as the frdest_t parameter
3206                          */
3207                         (void) ipf_fastroute(fin->fin_m, mp, fin, NULL);
3208                         m = *mp = NULL;
3209                 } else if ((fdp != NULL) && (fdp->fd_ptr != NULL) &&
3210                            (fdp->fd_ptr != (struct ifnet *)-1)) {
3211                         /* this is for to rules: */
3212                         ipf_fastroute(fin->fin_m, mp, fin, fdp);
3213                         m = *mp = NULL;
3214                 }
3215
3216 #if defined(FASTROUTE_RECURSION)
3217                 (void) ipf_derefrule(softc, &fr);
3218 #endif
3219         }
3220 #if !defined(FASTROUTE_RECURSION)
3221         RWLOCK_EXIT(&softc->ipf_mutex);
3222 #endif
3223
3224 finished:
3225         if (!FR_ISPASS(pass)) {
3226                 LBUMP(ipf_stats[out].fr_block);
3227                 if (*mp != NULL) {
3228 #ifdef _KERNEL
3229                         FREE_MB_T(*mp);
3230 #endif
3231                         m = *mp = NULL;
3232                 }
3233         } else {
3234                 LBUMP(ipf_stats[out].fr_pass);
3235 #if defined(_KERNEL) && defined(__sgi)
3236                 if ((fin->fin_hbuf != NULL) &&
3237                     (mtod(fin->fin_m, struct ip *) != fin->fin_ip)) {
3238                         COPYBACK(fin->fin_m, 0, fin->fin_plen, fin->fin_hbuf);
3239                 }
3240 #endif
3241         }
3242
3243         SPL_X(s);
3244
3245 #ifdef _KERNEL
3246         if (FR_ISPASS(pass))
3247                 return 0;
3248         LBUMP(ipf_stats[out].fr_blocked[fin->fin_reason]);
3249         return fin->fin_error;
3250 #else /* _KERNEL */
3251         if (*mp != NULL)
3252                 (*mp)->mb_ifp = fin->fin_ifp;
3253         blockreason = fin->fin_reason;
3254         FR_VERBOSE(("fin_flx %#x pass %#x ", fin->fin_flx, pass));
3255         /*if ((pass & FR_CMDMASK) == (softc->ipf_pass & FR_CMDMASK))*/
3256                 if ((pass & FR_NOMATCH) != 0)
3257                         return 1;
3258
3259         if ((pass & FR_RETMASK) != 0)
3260                 switch (pass & FR_RETMASK)
3261                 {
3262                 case FR_RETRST :
3263                         return 3;
3264                 case FR_RETICMP :
3265                         return 4;
3266                 case FR_FAKEICMP :
3267                         return 5;
3268                 }
3269
3270         switch (pass & FR_CMDMASK)
3271         {
3272         case FR_PASS :
3273                 return 0;
3274         case FR_BLOCK :
3275                 return -1;
3276         case FR_AUTH :
3277                 return -2;
3278         case FR_ACCOUNT :
3279                 return -3;
3280         case FR_PREAUTH :
3281                 return -4;
3282         }
3283         return 2;
3284 #endif /* _KERNEL */
3285 }
3286
3287
3288 #ifdef  IPFILTER_LOG
3289 /* ------------------------------------------------------------------------ */
3290 /* Function:    ipf_dolog                                                   */
3291 /* Returns:     frentry_t* - returns contents of fin_fr (no change made)    */
3292 /* Parameters:  fin(I) - pointer to packet information                      */
3293 /*              passp(IO) - pointer to current/new filter decision (unused) */
3294 /*                                                                          */
3295 /* Checks flags set to see how a packet should be logged, if it is to be    */
3296 /* logged.  Adjust statistics based on its success or not.                  */
3297 /* ------------------------------------------------------------------------ */
3298 frentry_t *
3299 ipf_dolog(fin, passp)
3300         fr_info_t *fin;
3301         u_32_t *passp;
3302 {
3303         ipf_main_softc_t *softc = fin->fin_main_soft;
3304         u_32_t pass;
3305         int out;
3306
3307         out = fin->fin_out;
3308         pass = *passp;
3309
3310         if ((softc->ipf_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
3311                 pass |= FF_LOGNOMATCH;
3312                 LBUMPD(ipf_stats[out], fr_npkl);
3313                 goto logit;
3314
3315         } else if (((pass & FR_LOGMASK) == FR_LOGP) ||
3316             (FR_ISPASS(pass) && (softc->ipf_flags & FF_LOGPASS))) {
3317                 if ((pass & FR_LOGMASK) != FR_LOGP)
3318                         pass |= FF_LOGPASS;
3319                 LBUMPD(ipf_stats[out], fr_ppkl);
3320                 goto logit;
3321
3322         } else if (((pass & FR_LOGMASK) == FR_LOGB) ||
3323                    (FR_ISBLOCK(pass) && (softc->ipf_flags & FF_LOGBLOCK))) {
3324                 if ((pass & FR_LOGMASK) != FR_LOGB)
3325                         pass |= FF_LOGBLOCK;
3326                 LBUMPD(ipf_stats[out], fr_bpkl);
3327
3328 logit:
3329                 if (ipf_log_pkt(fin, pass) == -1) {
3330                         /*
3331                          * If the "or-block" option has been used then
3332                          * block the packet if we failed to log it.
3333                          */
3334                         if ((pass & FR_LOGORBLOCK) && FR_ISPASS(pass)) {
3335                                 DT1(frb_logfail2, u_int, pass);
3336                                 pass &= ~FR_CMDMASK;
3337                                 pass |= FR_BLOCK;
3338                                 fin->fin_reason = FRB_LOGFAIL2;
3339                         }
3340                 }
3341                 *passp = pass;
3342         }
3343
3344         return fin->fin_fr;
3345 }
3346 #endif /* IPFILTER_LOG */
3347
3348
3349 /* ------------------------------------------------------------------------ */
3350 /* Function:    ipf_cksum                                                   */
3351 /* Returns:     u_short - IP header checksum                                */
3352 /* Parameters:  addr(I) - pointer to start of buffer to checksum            */
3353 /*              len(I)  - length of buffer in bytes                         */
3354 /*                                                                          */
3355 /* Calculate the two's complement 16 bit checksum of the buffer passed.     */
3356 /*                                                                          */
3357 /* N.B.: addr should be 16bit aligned.                                      */
3358 /* ------------------------------------------------------------------------ */
3359 u_short
3360 ipf_cksum(addr, len)
3361         u_short *addr;
3362         int len;
3363 {
3364         u_32_t sum = 0;
3365
3366         for (sum = 0; len > 1; len -= 2)
3367                 sum += *addr++;
3368
3369         /* mop up an odd byte, if necessary */
3370         if (len == 1)
3371                 sum += *(u_char *)addr;
3372
3373         /*
3374          * add back carry outs from top 16 bits to low 16 bits
3375          */
3376         sum = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
3377         sum += (sum >> 16);                     /* add carry */
3378         return (u_short)(~sum);
3379 }
3380
3381
3382 /* ------------------------------------------------------------------------ */
3383 /* Function:    fr_cksum                                                    */
3384 /* Returns:     u_short - layer 4 checksum                                  */
3385 /* Parameters:  fin(I)     - pointer to packet information                  */
3386 /*              ip(I)      - pointer to IP header                           */
3387 /*              l4proto(I) - protocol to caclulate checksum for             */
3388 /*              l4hdr(I)   - pointer to layer 4 header                      */
3389 /*                                                                          */
3390 /* Calculates the TCP checksum for the packet held in "m", using the data   */
3391 /* in the IP header "ip" to seed it.                                        */
3392 /*                                                                          */
3393 /* NB: This function assumes we've pullup'd enough for all of the IP header */
3394 /* and the TCP header.  We also assume that data blocks aren't allocated in */
3395 /* odd sizes.                                                               */
3396 /*                                                                          */
3397 /* Expects ip_len and ip_off to be in network byte order when called.       */
3398 /* ------------------------------------------------------------------------ */
3399 u_short
3400 fr_cksum(fin, ip, l4proto, l4hdr)
3401         fr_info_t *fin;
3402         ip_t *ip;
3403         int l4proto;
3404         void *l4hdr;
3405 {
3406         u_short *sp, slen, sumsave, *csump;
3407         u_int sum, sum2;
3408         int hlen;
3409         int off;
3410 #ifdef  USE_INET6
3411         ip6_t *ip6;
3412 #endif
3413
3414         csump = NULL;
3415         sumsave = 0;
3416         sp = NULL;
3417         slen = 0;
3418         hlen = 0;
3419         sum = 0;
3420
3421         sum = htons((u_short)l4proto);
3422         /*
3423          * Add up IP Header portion
3424          */
3425 #ifdef  USE_INET6
3426         if (IP_V(ip) == 4) {
3427 #endif
3428                 hlen = IP_HL(ip) << 2;
3429                 off = hlen;
3430                 sp = (u_short *)&ip->ip_src;
3431                 sum += *sp++;   /* ip_src */
3432                 sum += *sp++;
3433                 sum += *sp++;   /* ip_dst */
3434                 sum += *sp++;
3435 #ifdef  USE_INET6
3436         } else if (IP_V(ip) == 6) {
3437                 ip6 = (ip6_t *)ip;
3438                 hlen = sizeof(*ip6);
3439                 off = ((char *)fin->fin_dp - (char *)fin->fin_ip);
3440                 sp = (u_short *)&ip6->ip6_src;
3441                 sum += *sp++;   /* ip6_src */
3442                 sum += *sp++;
3443                 sum += *sp++;
3444                 sum += *sp++;
3445                 sum += *sp++;
3446                 sum += *sp++;
3447                 sum += *sp++;
3448                 sum += *sp++;
3449                 /* This needs to be routing header aware. */
3450                 sum += *sp++;   /* ip6_dst */
3451                 sum += *sp++;
3452                 sum += *sp++;
3453                 sum += *sp++;
3454                 sum += *sp++;
3455                 sum += *sp++;
3456                 sum += *sp++;
3457                 sum += *sp++;
3458         } else {
3459                 return 0xffff;
3460         }
3461 #endif
3462         slen = fin->fin_plen - off;
3463         sum += htons(slen);
3464
3465         switch (l4proto)
3466         {
3467         case IPPROTO_UDP :
3468                 csump = &((udphdr_t *)l4hdr)->uh_sum;
3469                 break;
3470
3471         case IPPROTO_TCP :
3472                 csump = &((tcphdr_t *)l4hdr)->th_sum;
3473                 break;
3474         case IPPROTO_ICMP :
3475                 csump = &((icmphdr_t *)l4hdr)->icmp_cksum;
3476                 sum = 0;        /* Pseudo-checksum is not included */
3477                 break;
3478 #ifdef USE_INET6
3479         case IPPROTO_ICMPV6 :
3480                 csump = &((struct icmp6_hdr *)l4hdr)->icmp6_cksum;
3481                 break;
3482 #endif
3483         default :
3484                 break;
3485         }
3486
3487         if (csump != NULL) {
3488                 sumsave = *csump;
3489                 *csump = 0;
3490         }
3491
3492         sum2 = ipf_pcksum(fin, off, sum);
3493         if (csump != NULL)
3494                 *csump = sumsave;
3495         return sum2;
3496 }
3497
3498
3499 /* ------------------------------------------------------------------------ */
3500 /* Function:    ipf_findgroup                                               */
3501 /* Returns:     frgroup_t * - NULL = group not found, else pointer to group */
3502 /* Parameters:  softc(I) - pointer to soft context main structure           */
3503 /*              group(I) - group name to search for                         */
3504 /*              unit(I)  - device to which this group belongs               */
3505 /*              set(I)   - which set of rules (inactive/inactive) this is   */
3506 /*              fgpp(O)  - pointer to place to store pointer to the pointer */
3507 /*                         to where to add the next (last) group or where   */
3508 /*                         to delete group from.                            */
3509 /*                                                                          */
3510 /* Search amongst the defined groups for a particular group number.         */
3511 /* ------------------------------------------------------------------------ */
3512 frgroup_t *
3513 ipf_findgroup(softc, group, unit, set, fgpp)
3514         ipf_main_softc_t *softc;
3515         char *group;
3516         minor_t unit;
3517         int set;
3518         frgroup_t ***fgpp;
3519 {
3520         frgroup_t *fg, **fgp;
3521
3522         /*
3523          * Which list of groups to search in is dependent on which list of
3524          * rules are being operated on.
3525          */
3526         fgp = &softc->ipf_groups[unit][set];
3527
3528         while ((fg = *fgp) != NULL) {
3529                 if (strncmp(group, fg->fg_name, FR_GROUPLEN) == 0)
3530                         break;
3531                 else
3532                         fgp = &fg->fg_next;
3533         }
3534         if (fgpp != NULL)
3535                 *fgpp = fgp;
3536         return fg;
3537 }
3538
3539
3540 /* ------------------------------------------------------------------------ */
3541 /* Function:    ipf_group_add                                               */
3542 /* Returns:     frgroup_t * - NULL == did not create group,                 */
3543 /*                            != NULL == pointer to the group               */
3544 /* Parameters:  softc(I) - pointer to soft context main structure           */
3545 /*              num(I)   - group number to add                              */
3546 /*              head(I)  - rule pointer that is using this as the head      */
3547 /*              flags(I) - rule flags which describe the type of rule it is */
3548 /*              unit(I)  - device to which this group will belong to        */
3549 /*              set(I)   - which set of rules (inactive/inactive) this is   */
3550 /* Write Locks: ipf_mutex                                                   */
3551 /*                                                                          */
3552 /* Add a new group head, or if it already exists, increase the reference    */
3553 /* count to it.                                                             */
3554 /* ------------------------------------------------------------------------ */
3555 frgroup_t *
3556 ipf_group_add(softc, group, head, flags, unit, set)
3557         ipf_main_softc_t *softc;
3558         char *group;
3559         void *head;
3560         u_32_t flags;
3561         minor_t unit;
3562         int set;
3563 {
3564         frgroup_t *fg, **fgp;
3565         u_32_t gflags;
3566
3567         if (group == NULL)
3568                 return NULL;
3569
3570         if (unit == IPL_LOGIPF && *group == '\0')
3571                 return NULL;
3572
3573         fgp = NULL;
3574         gflags = flags & FR_INOUT;
3575
3576         fg = ipf_findgroup(softc, group, unit, set, &fgp);
3577         if (fg != NULL) {
3578                 if (fg->fg_head == NULL && head != NULL)
3579                         fg->fg_head = head;
3580                 if (fg->fg_flags == 0)
3581                         fg->fg_flags = gflags;
3582                 else if (gflags != fg->fg_flags)
3583                         return NULL;
3584                 fg->fg_ref++;
3585                 return fg;
3586         }
3587
3588         KMALLOC(fg, frgroup_t *);
3589         if (fg != NULL) {
3590                 fg->fg_head = head;
3591                 fg->fg_start = NULL;
3592                 fg->fg_next = *fgp;
3593                 bcopy(group, fg->fg_name, strlen(group) + 1);
3594                 fg->fg_flags = gflags;
3595                 fg->fg_ref = 1;
3596                 fg->fg_set = &softc->ipf_groups[unit][set];
3597                 *fgp = fg;
3598         }
3599         return fg;
3600 }
3601
3602
3603 /* ------------------------------------------------------------------------ */
3604 /* Function:    ipf_group_del                                               */
3605 /* Returns:     int      - number of rules deleted                          */
3606 /* Parameters:  softc(I) - pointer to soft context main structure           */
3607 /*              group(I) - group name to delete                             */
3608 /*              fr(I)    - filter rule from which group is referenced       */
3609 /* Write Locks: ipf_mutex                                                   */
3610 /*                                                                          */
3611 /* This function is called whenever a reference to a group is to be dropped */
3612 /* and thus its reference count needs to be lowered and the group free'd if */
3613 /* the reference count reaches zero. Passing in fr is really for the sole   */
3614 /* purpose of knowing when the head rule is being deleted.                  */
3615 /* ------------------------------------------------------------------------ */
3616 void
3617 ipf_group_del(softc, group, fr)
3618         ipf_main_softc_t *softc;
3619         frgroup_t *group;
3620         frentry_t *fr;
3621 {
3622
3623         if (group->fg_head == fr)
3624                 group->fg_head = NULL;
3625
3626         group->fg_ref--;
3627         if ((group->fg_ref == 0) && (group->fg_start == NULL))
3628                 ipf_group_free(group);
3629 }
3630
3631
3632 /* ------------------------------------------------------------------------ */
3633 /* Function:    ipf_group_free                                              */
3634 /* Returns:     Nil                                                         */
3635 /* Parameters:  group(I) - pointer to filter rule group                     */
3636 /*                                                                          */
3637 /* Remove the group from the list of groups and free it.                    */
3638 /* ------------------------------------------------------------------------ */
3639 static void
3640 ipf_group_free(group)
3641         frgroup_t *group;
3642 {
3643         frgroup_t **gp;
3644
3645         for (gp = group->fg_set; *gp != NULL; gp = &(*gp)->fg_next) {
3646                 if (*gp == group) {
3647                         *gp = group->fg_next;
3648                         break;
3649                 }
3650         }
3651         KFREE(group);
3652 }
3653
3654
3655 /* ------------------------------------------------------------------------ */
3656 /* Function:    ipf_group_flush                                             */
3657 /* Returns:     int      - number of rules flush from group                 */
3658 /* Parameters:  softc(I) - pointer to soft context main structure           */
3659 /* Parameters:  group(I) - pointer to filter rule group                     */
3660 /*                                                                          */
3661 /* Remove all of the rules that currently are listed under the given group. */
3662 /* ------------------------------------------------------------------------ */
3663 static int
3664 ipf_group_flush(softc, group)
3665         ipf_main_softc_t *softc;
3666         frgroup_t *group;
3667 {
3668         int gone = 0;
3669
3670         (void) ipf_flushlist(softc, &gone, &group->fg_start);
3671
3672         return gone;
3673 }
3674
3675
3676 /* ------------------------------------------------------------------------ */
3677 /* Function:    ipf_getrulen                                                */
3678 /* Returns:     frentry_t * - NULL == not found, else pointer to rule n     */
3679 /* Parameters:  softc(I) - pointer to soft context main structure           */
3680 /* Parameters:  unit(I)  - device for which to count the rule's number      */
3681 /*              flags(I) - which set of rules to find the rule in           */
3682 /*              group(I) - group name                                       */
3683 /*              n(I)     - rule number to find                              */
3684 /*                                                                          */
3685 /* Find rule # n in group # g and return a pointer to it.  Return NULl if   */
3686 /* group # g doesn't exist or there are less than n rules in the group.     */
3687 /* ------------------------------------------------------------------------ */
3688 frentry_t *
3689 ipf_getrulen(softc, unit, group, n)
3690         ipf_main_softc_t *softc;
3691         int unit;
3692         char *group;
3693         u_32_t n;
3694 {
3695         frentry_t *fr;
3696         frgroup_t *fg;
3697
3698         fg = ipf_findgroup(softc, group, unit, softc->ipf_active, NULL);
3699         if (fg == NULL)
3700                 return NULL;
3701         for (fr = fg->fg_start; fr && n; fr = fr->fr_next, n--)
3702                 ;
3703         if (n != 0)
3704                 return NULL;
3705         return fr;
3706 }
3707
3708
3709 /* ------------------------------------------------------------------------ */
3710 /* Function:    ipf_flushlist                                               */
3711 /* Returns:     int - >= 0 - number of flushed rules                        */
3712 /* Parameters:  softc(I)   - pointer to soft context main structure         */
3713 /*              nfreedp(O) - pointer to int where flush count is stored     */
3714 /*              listp(I)   - pointer to list to flush pointer               */
3715 /* Write Locks: ipf_mutex                                                   */
3716 /*                                                                          */
3717 /* Recursively flush rules from the list, descending groups as they are     */
3718 /* encountered.  if a rule is the head of a group and it has lost all its   */
3719 /* group members, then also delete the group reference.  nfreedp is needed  */
3720 /* to store the accumulating count of rules removed, whereas the returned   */
3721 /* value is just the number removed from the current list.  The latter is   */
3722 /* needed to correctly adjust reference counts on rules that define groups. */
3723 /*                                                                          */
3724 /* NOTE: Rules not loaded from user space cannot be flushed.                */
3725 /* ------------------------------------------------------------------------ */
3726 static int
3727 ipf_flushlist(softc, nfreedp, listp)
3728         ipf_main_softc_t *softc;
3729         int *nfreedp;
3730         frentry_t **listp;
3731 {
3732         int freed = 0;
3733         frentry_t *fp;
3734
3735         while ((fp = *listp) != NULL) {
3736                 if ((fp->fr_type & FR_T_BUILTIN) ||
3737                     !(fp->fr_flags & FR_COPIED)) {
3738                         listp = &fp->fr_next;
3739                         continue;
3740                 }
3741                 *listp = fp->fr_next;
3742                 if (fp->fr_next != NULL)
3743                         fp->fr_next->fr_pnext = fp->fr_pnext;
3744                 fp->fr_pnext = NULL;
3745
3746                 if (fp->fr_grphead != NULL) {
3747                         freed += ipf_group_flush(softc, fp->fr_grphead);
3748                         fp->fr_names[fp->fr_grhead] = '\0';
3749                 }
3750
3751                 if (fp->fr_icmpgrp != NULL) {
3752                         freed += ipf_group_flush(softc, fp->fr_icmpgrp);
3753                         fp->fr_names[fp->fr_icmphead] = '\0';
3754                 }
3755
3756                 if (fp->fr_srctrack.ht_max_nodes)
3757                         ipf_rb_ht_flush(&fp->fr_srctrack);
3758
3759                 fp->fr_next = NULL;
3760
3761                 ASSERT(fp->fr_ref > 0);
3762                 if (ipf_derefrule(softc, &fp) == 0)
3763                         freed++;
3764         }
3765         *nfreedp += freed;
3766         return freed;
3767 }
3768
3769
3770 /* ------------------------------------------------------------------------ */
3771 /* Function:    ipf_flush                                                   */
3772 /* Returns:     int - >= 0 - number of flushed rules                        */
3773 /* Parameters:  softc(I) - pointer to soft context main structure           */
3774 /*              unit(I)  - device for which to flush rules                  */
3775 /*              flags(I) - which set of rules to flush                      */
3776 /*                                                                          */
3777 /* Calls flushlist() for all filter rules (accounting, firewall - both IPv4 */
3778 /* and IPv6) as defined by the value of flags.                              */
3779 /* ------------------------------------------------------------------------ */
3780 int
3781 ipf_flush(softc, unit, flags)
3782         ipf_main_softc_t *softc;
3783         minor_t unit;
3784         int flags;
3785 {
3786         int flushed = 0, set;
3787
3788         WRITE_ENTER(&softc->ipf_mutex);
3789
3790         set = softc->ipf_active;
3791         if ((flags & FR_INACTIVE) == FR_INACTIVE)
3792                 set = 1 - set;
3793
3794         if (flags & FR_OUTQUE) {
3795                 ipf_flushlist(softc, &flushed, &softc->ipf_rules[1][set]);
3796                 ipf_flushlist(softc, &flushed, &softc->ipf_acct[1][set]);
3797         }
3798         if (flags & FR_INQUE) {
3799                 ipf_flushlist(softc, &flushed, &softc->ipf_rules[0][set]);
3800                 ipf_flushlist(softc, &flushed, &softc->ipf_acct[0][set]);
3801         }
3802
3803         flushed += ipf_flush_groups(softc, &softc->ipf_groups[unit][set],
3804                                     flags & (FR_INQUE|FR_OUTQUE));
3805
3806         RWLOCK_EXIT(&softc->ipf_mutex);
3807
3808         if (unit == IPL_LOGIPF) {
3809                 int tmp;
3810
3811                 tmp = ipf_flush(softc, IPL_LOGCOUNT, flags);
3812                 if (tmp >= 0)
3813                         flushed += tmp;
3814         }
3815         return flushed;
3816 }
3817
3818
3819 /* ------------------------------------------------------------------------ */
3820 /* Function:    ipf_flush_groups                                            */
3821 /* Returns:     int - >= 0 - number of flushed rules                        */
3822 /* Parameters:  softc(I)  - soft context pointerto work with                */
3823 /*              grhead(I) - pointer to the start of the group list to flush */
3824 /*              flags(I)  - which set of rules to flush                     */
3825 /*                                                                          */
3826 /* Walk through all of the groups under the given group head and remove all */
3827 /* of those that match the flags passed in. The for loop here is bit more   */
3828 /* complicated than usual because the removal of a rule with ipf_derefrule  */
3829 /* may end up removing not only the structure pointed to by "fg" but also   */
3830 /* what is fg_next and fg_next after that. So if a filter rule is actually  */
3831 /* removed from the group then it is necessary to start again.              */
3832 /* ------------------------------------------------------------------------ */
3833 static int
3834 ipf_flush_groups(softc, grhead, flags)
3835         ipf_main_softc_t *softc;
3836         frgroup_t **grhead;
3837         int flags;
3838 {
3839         frentry_t *fr, **frp;
3840         frgroup_t *fg, **fgp;
3841         int flushed = 0;
3842         int removed = 0;
3843
3844         for (fgp = grhead; (fg = *fgp) != NULL; ) {
3845                 while ((fg != NULL) && ((fg->fg_flags & flags) == 0))
3846                         fg = fg->fg_next;
3847                 if (fg == NULL)
3848                         break;
3849                 removed = 0;
3850                 frp = &fg->fg_start;
3851                 while ((removed == 0) && ((fr = *frp) != NULL)) {
3852                         if ((fr->fr_flags & flags) == 0) {
3853                                 frp = &fr->fr_next;
3854                         } else {
3855                                 if (fr->fr_next != NULL)
3856                                         fr->fr_next->fr_pnext = fr->fr_pnext;
3857                                 *frp = fr->fr_next;
3858                                 fr->fr_pnext = NULL;
3859                                 fr->fr_next = NULL;
3860                                 (void) ipf_derefrule(softc, &fr);
3861                                 flushed++;
3862                                 removed++;
3863                         }
3864                 }
3865                 if (removed == 0)
3866                         fgp = &fg->fg_next;
3867         }
3868         return flushed;
3869 }
3870
3871
3872 /* ------------------------------------------------------------------------ */
3873 /* Function:    memstr                                                      */
3874 /* Returns:     char *  - NULL if failed, != NULL pointer to matching bytes */
3875 /* Parameters:  src(I)  - pointer to byte sequence to match                 */
3876 /*              dst(I)  - pointer to byte sequence to search                */
3877 /*              slen(I) - match length                                      */
3878 /*              dlen(I) - length available to search in                     */
3879 /*                                                                          */
3880 /* Search dst for a sequence of bytes matching those at src and extend for  */
3881 /* slen bytes.                                                              */
3882 /* ------------------------------------------------------------------------ */
3883 char *
3884 memstr(src, dst, slen, dlen)
3885         const char *src;
3886         char *dst;
3887         size_t slen, dlen;
3888 {
3889         char *s = NULL;
3890
3891         while (dlen >= slen) {
3892                 if (bcmp(src, dst, slen) == 0) {
3893                         s = dst;
3894                         break;
3895                 }
3896                 dst++;
3897                 dlen--;
3898         }
3899         return s;
3900 }
3901 /* ------------------------------------------------------------------------ */
3902 /* Function:    ipf_fixskip                                                 */
3903 /* Returns:     Nil                                                         */
3904 /* Parameters:  listp(IO)    - pointer to start of list with skip rule      */
3905 /*              rp(I)        - rule added/removed with skip in it.          */
3906 /*              addremove(I) - adjustment (-1/+1) to make to skip count,    */
3907 /*                             depending on whether a rule was just added   */
3908 /*                             or removed.                                  */
3909 /*                                                                          */
3910 /* Adjust all the rules in a list which would have skip'd past the position */
3911 /* where we are inserting to skip to the right place given the change.      */
3912 /* ------------------------------------------------------------------------ */
3913 void
3914 ipf_fixskip(listp, rp, addremove)
3915         frentry_t **listp, *rp;
3916         int addremove;
3917 {
3918         int rules, rn;
3919         frentry_t *fp;
3920
3921         rules = 0;
3922         for (fp = *listp; (fp != NULL) && (fp != rp); fp = fp->fr_next)
3923                 rules++;
3924
3925         if (!fp)
3926                 return;
3927
3928         for (rn = 0, fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
3929                 if (FR_ISSKIP(fp->fr_flags) && (rn + fp->fr_arg >= rules))
3930                         fp->fr_arg += addremove;
3931 }
3932
3933
3934 #ifdef  _KERNEL
3935 /* ------------------------------------------------------------------------ */
3936 /* Function:    count4bits                                                  */
3937 /* Returns:     int - >= 0 - number of consecutive bits in input            */
3938 /* Parameters:  ip(I) - 32bit IP address                                    */
3939 /*                                                                          */
3940 /* IPv4 ONLY                                                                */
3941 /* count consecutive 1's in bit mask.  If the mask generated by counting    */
3942 /* consecutive 1's is different to that passed, return -1, else return #    */
3943 /* of bits.                                                                 */
3944 /* ------------------------------------------------------------------------ */
3945 int
3946 count4bits(ip)
3947         u_32_t  ip;
3948 {
3949         u_32_t  ipn;
3950         int     cnt = 0, i, j;
3951
3952         ip = ipn = ntohl(ip);
3953         for (i = 32; i; i--, ipn *= 2)
3954                 if (ipn & 0x80000000)
3955                         cnt++;
3956                 else
3957                         break;
3958         ipn = 0;
3959         for (i = 32, j = cnt; i; i--, j--) {
3960                 ipn *= 2;
3961                 if (j > 0)
3962                         ipn++;
3963         }
3964         if (ipn == ip)
3965                 return cnt;
3966         return -1;
3967 }
3968
3969
3970 /* ------------------------------------------------------------------------ */
3971 /* Function:    count6bits                                                  */
3972 /* Returns:     int - >= 0 - number of consecutive bits in input            */
3973 /* Parameters:  msk(I) - pointer to start of IPv6 bitmask                   */
3974 /*                                                                          */
3975 /* IPv6 ONLY                                                                */
3976 /* count consecutive 1's in bit mask.                                       */
3977 /* ------------------------------------------------------------------------ */
3978 # ifdef USE_INET6
3979 int
3980 count6bits(msk)
3981         u_32_t *msk;
3982 {
3983         int i = 0, k;
3984         u_32_t j;
3985
3986         for (k = 3; k >= 0; k--)
3987                 if (msk[k] == 0xffffffff)
3988                         i += 32;
3989                 else {
3990                         for (j = msk[k]; j; j <<= 1)
3991                                 if (j & 0x80000000)
3992                                         i++;
3993                 }
3994         return i;
3995 }
3996 # endif
3997 #endif /* _KERNEL */
3998
3999
4000 /* ------------------------------------------------------------------------ */
4001 /* Function:    ipf_synclist                                                */
4002 /* Returns:     int    - 0 = no failures, else indication of first failure  */
4003 /* Parameters:  fr(I)  - start of filter list to sync interface names for   */
4004 /*              ifp(I) - interface pointer for limiting sync lookups        */
4005 /* Write Locks: ipf_mutex                                                   */
4006 /*                                                                          */
4007 /* Walk through a list of filter rules and resolve any interface names into */
4008 /* pointers.  Where dynamic addresses are used, also update the IP address  */
4009 /* used in the rule.  The interface pointer is used to limit the lookups to */
4010 /* a specific set of matching names if it is non-NULL.                      */
4011 /* Errors can occur when resolving the destination name of to/dup-to fields */
4012 /* when the name points to a pool and that pool doest not exist. If this    */
4013 /* does happen then it is necessary to check if there are any lookup refs   */
4014 /* that need to be dropped before returning with an error.                  */
4015 /* ------------------------------------------------------------------------ */
4016 static int
4017 ipf_synclist(softc, fr, ifp)
4018         ipf_main_softc_t *softc;
4019         frentry_t *fr;
4020         void *ifp;
4021 {
4022         frentry_t *frt, *start = fr;
4023         frdest_t *fdp;
4024         char *name;
4025         int error;
4026         void *ifa;
4027         int v, i;
4028
4029         error = 0;
4030
4031         for (; fr; fr = fr->fr_next) {
4032                 if (fr->fr_family == AF_INET)
4033                         v = 4;
4034                 else if (fr->fr_family == AF_INET6)
4035                         v = 6;
4036                 else
4037                         v = 0;
4038
4039                 /*
4040                  * Lookup all the interface names that are part of the rule.
4041                  */
4042                 for (i = 0; i < 4; i++) {
4043                         if ((ifp != NULL) && (fr->fr_ifas[i] != ifp))
4044                                 continue;
4045                         if (fr->fr_ifnames[i] == -1)
4046                                 continue;
4047                         name = FR_NAME(fr, fr_ifnames[i]);
4048                         fr->fr_ifas[i] = ipf_resolvenic(softc, name, v);
4049                 }
4050
4051                 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) {
4052                         if (fr->fr_satype != FRI_NORMAL &&
4053                             fr->fr_satype != FRI_LOOKUP) {
4054                                 ifa = ipf_resolvenic(softc, fr->fr_names +
4055                                                      fr->fr_sifpidx, v);
4056                                 ipf_ifpaddr(softc, v, fr->fr_satype, ifa,
4057                                             &fr->fr_src6, &fr->fr_smsk6);
4058                         }
4059                         if (fr->fr_datype != FRI_NORMAL &&
4060                             fr->fr_datype != FRI_LOOKUP) {
4061                                 ifa = ipf_resolvenic(softc, fr->fr_names +
4062                                                      fr->fr_sifpidx, v);
4063                                 ipf_ifpaddr(softc, v, fr->fr_datype, ifa,
4064                                             &fr->fr_dst6, &fr->fr_dmsk6);
4065                         }
4066                 }
4067
4068                 fdp = &fr->fr_tifs[0];
4069                 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4070                         error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4071                         if (error != 0)
4072                                 goto unwind;
4073                 }
4074
4075                 fdp = &fr->fr_tifs[1];
4076                 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4077                         error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4078                         if (error != 0)
4079                                 goto unwind;
4080                 }
4081
4082                 fdp = &fr->fr_dif;
4083                 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4084                         error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4085                         if (error != 0)
4086                                 goto unwind;
4087                 }
4088
4089                 if (((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4090                     (fr->fr_satype == FRI_LOOKUP) && (fr->fr_srcptr == NULL)) {
4091                         fr->fr_srcptr = ipf_lookup_res_num(softc,
4092                                                            fr->fr_srctype,
4093                                                            IPL_LOGIPF,
4094                                                            fr->fr_srcnum,
4095                                                            &fr->fr_srcfunc);
4096                 }
4097                 if (((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4098                     (fr->fr_datype == FRI_LOOKUP) && (fr->fr_dstptr == NULL)) {
4099                         fr->fr_dstptr = ipf_lookup_res_num(softc,
4100                                                            fr->fr_dsttype,
4101                                                            IPL_LOGIPF,
4102                                                            fr->fr_dstnum,
4103                                                            &fr->fr_dstfunc);
4104                 }
4105         }
4106         return 0;
4107
4108 unwind:
4109         for (frt = start; frt != fr; fr = fr->fr_next) {
4110                 if (((frt->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4111                     (frt->fr_satype == FRI_LOOKUP) && (frt->fr_srcptr != NULL))
4112                                 ipf_lookup_deref(softc, frt->fr_srctype,
4113                                                  frt->fr_srcptr);
4114                 if (((frt->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4115                     (frt->fr_datype == FRI_LOOKUP) && (frt->fr_dstptr != NULL))
4116                                 ipf_lookup_deref(softc, frt->fr_dsttype,
4117                                                  frt->fr_dstptr);
4118         }
4119         return error;
4120 }
4121
4122
4123 /* ------------------------------------------------------------------------ */
4124 /* Function:    ipf_sync                                                    */
4125 /* Returns:     void                                                        */
4126 /* Parameters:  Nil                                                         */
4127 /*                                                                          */
4128 /* ipf_sync() is called when we suspect that the interface list or          */
4129 /* information about interfaces (like IP#) has changed.  Go through all     */
4130 /* filter rules, NAT entries and the state table and check if anything      */
4131 /* needs to be changed/updated.                                             */
4132 /* ------------------------------------------------------------------------ */
4133 int
4134 ipf_sync(softc, ifp)
4135         ipf_main_softc_t *softc;
4136         void *ifp;
4137 {
4138         int i;
4139
4140 # if !SOLARIS
4141         ipf_nat_sync(softc, ifp);
4142         ipf_state_sync(softc, ifp);
4143         ipf_lookup_sync(softc, ifp);
4144 # endif
4145
4146         WRITE_ENTER(&softc->ipf_mutex);
4147         (void) ipf_synclist(softc, softc->ipf_acct[0][softc->ipf_active], ifp);
4148         (void) ipf_synclist(softc, softc->ipf_acct[1][softc->ipf_active], ifp);
4149         (void) ipf_synclist(softc, softc->ipf_rules[0][softc->ipf_active], ifp);
4150         (void) ipf_synclist(softc, softc->ipf_rules[1][softc->ipf_active], ifp);
4151
4152         for (i = 0; i < IPL_LOGSIZE; i++) {
4153                 frgroup_t *g;
4154
4155                 for (g = softc->ipf_groups[i][0]; g != NULL; g = g->fg_next)
4156                         (void) ipf_synclist(softc, g->fg_start, ifp);
4157                 for (g = softc->ipf_groups[i][1]; g != NULL; g = g->fg_next)
4158                         (void) ipf_synclist(softc, g->fg_start, ifp);
4159         }
4160         RWLOCK_EXIT(&softc->ipf_mutex);
4161
4162         return 0;
4163 }
4164
4165
4166 /*
4167  * In the functions below, bcopy() is called because the pointer being
4168  * copied _from_ in this instance is a pointer to a char buf (which could
4169  * end up being unaligned) and on the kernel's local stack.
4170  */
4171 /* ------------------------------------------------------------------------ */
4172 /* Function:    copyinptr                                                   */
4173 /* Returns:     int - 0 = success, else failure                             */
4174 /* Parameters:  src(I)  - pointer to the source address                     */
4175 /*              dst(I)  - destination address                               */
4176 /*              size(I) - number of bytes to copy                           */
4177 /*                                                                          */
4178 /* Copy a block of data in from user space, given a pointer to the pointer  */
4179 /* to start copying from (src) and a pointer to where to store it (dst).    */
4180 /* NB: src - pointer to user space pointer, dst - kernel space pointer      */
4181 /* ------------------------------------------------------------------------ */
4182 int
4183 copyinptr(softc, src, dst, size)
4184         ipf_main_softc_t *softc;
4185         void *src, *dst;
4186         size_t size;
4187 {
4188         caddr_t ca;
4189         int error;
4190
4191 # if SOLARIS
4192         error = COPYIN(src, &ca, sizeof(ca));
4193         if (error != 0)
4194                 return error;
4195 # else
4196         bcopy(src, (caddr_t)&ca, sizeof(ca));
4197 # endif
4198         error = COPYIN(ca, dst, size);
4199         if (error != 0) {
4200                 IPFERROR(3);
4201                 error = EFAULT;
4202         }
4203         return error;
4204 }
4205
4206
4207 /* ------------------------------------------------------------------------ */
4208 /* Function:    copyoutptr                                                  */
4209 /* Returns:     int - 0 = success, else failure                             */
4210 /* Parameters:  src(I)  - pointer to the source address                     */
4211 /*              dst(I)  - destination address                               */
4212 /*              size(I) - number of bytes to copy                           */
4213 /*                                                                          */
4214 /* Copy a block of data out to user space, given a pointer to the pointer   */
4215 /* to start copying from (src) and a pointer to where to store it (dst).    */
4216 /* NB: src - kernel space pointer, dst - pointer to user space pointer.     */
4217 /* ------------------------------------------------------------------------ */
4218 int
4219 copyoutptr(softc, src, dst, size)
4220         ipf_main_softc_t *softc;
4221         void *src, *dst;
4222         size_t size;
4223 {
4224         caddr_t ca;
4225         int error;
4226
4227         bcopy(dst, (caddr_t)&ca, sizeof(ca));
4228         error = COPYOUT(src, ca, size);
4229         if (error != 0) {
4230                 IPFERROR(4);
4231                 error = EFAULT;
4232         }
4233         return error;
4234 }
4235 #ifdef  _KERNEL
4236 #endif
4237
4238
4239 /* ------------------------------------------------------------------------ */
4240 /* Function:    ipf_lock                                                    */
4241 /* Returns:     int      - 0 = success, else error                          */
4242 /* Parameters:  data(I)  - pointer to lock value to set                     */
4243 /*              lockp(O) - pointer to location to store old lock value      */
4244 /*                                                                          */
4245 /* Get the new value for the lock integer, set it and return the old value  */
4246 /* in *lockp.                                                               */
4247 /* ------------------------------------------------------------------------ */
4248 int
4249 ipf_lock(data, lockp)
4250         caddr_t data;
4251         int *lockp;
4252 {
4253         int arg, err;
4254
4255         err = BCOPYIN(data, &arg, sizeof(arg));
4256         if (err != 0)
4257                 return EFAULT;
4258         err = BCOPYOUT(lockp, data, sizeof(*lockp));
4259         if (err != 0)
4260                 return EFAULT;
4261         *lockp = arg;
4262         return 0;
4263 }
4264
4265
4266 /* ------------------------------------------------------------------------ */
4267 /* Function:    ipf_getstat                                                 */
4268 /* Returns:     Nil                                                         */
4269 /* Parameters:  softc(I) - pointer to soft context main structure           */
4270 /*              fiop(I)  - pointer to ipfilter stats structure              */
4271 /*              rev(I)   - version claim by program doing ioctl             */
4272 /*                                                                          */
4273 /* Stores a copy of current pointers, counters, etc, in the friostat        */
4274 /* structure.                                                               */
4275 /* If IPFILTER_COMPAT is compiled, we pretend to be whatever version the    */
4276 /* program is looking for. This ensure that validation of the version it    */
4277 /* expects will always succeed. Thus kernels with IPFILTER_COMPAT will      */
4278 /* allow older binaries to work but kernels without it will not.            */
4279 /* ------------------------------------------------------------------------ */
4280 /*ARGSUSED*/
4281 static void
4282 ipf_getstat(softc, fiop, rev)
4283         ipf_main_softc_t *softc;
4284         friostat_t *fiop;
4285         int rev;
4286 {
4287         int i;
4288
4289         bcopy((char *)softc->ipf_stats, (char *)fiop->f_st,
4290               sizeof(ipf_statistics_t) * 2);
4291         fiop->f_locks[IPL_LOGSTATE] = -1;
4292         fiop->f_locks[IPL_LOGNAT] = -1;
4293         fiop->f_locks[IPL_LOGIPF] = -1;
4294         fiop->f_locks[IPL_LOGAUTH] = -1;
4295
4296         fiop->f_ipf[0][0] = softc->ipf_rules[0][0];
4297         fiop->f_acct[0][0] = softc->ipf_acct[0][0];
4298         fiop->f_ipf[0][1] = softc->ipf_rules[0][1];
4299         fiop->f_acct[0][1] = softc->ipf_acct[0][1];
4300         fiop->f_ipf[1][0] = softc->ipf_rules[1][0];
4301         fiop->f_acct[1][0] = softc->ipf_acct[1][0];
4302         fiop->f_ipf[1][1] = softc->ipf_rules[1][1];
4303         fiop->f_acct[1][1] = softc->ipf_acct[1][1];
4304
4305         fiop->f_ticks = softc->ipf_ticks;
4306         fiop->f_active = softc->ipf_active;
4307         fiop->f_froute[0] = softc->ipf_frouteok[0];
4308         fiop->f_froute[1] = softc->ipf_frouteok[1];
4309         fiop->f_rb_no_mem = softc->ipf_rb_no_mem;
4310         fiop->f_rb_node_max = softc->ipf_rb_node_max;
4311
4312         fiop->f_running = softc->ipf_running;
4313         for (i = 0; i < IPL_LOGSIZE; i++) {
4314                 fiop->f_groups[i][0] = softc->ipf_groups[i][0];
4315                 fiop->f_groups[i][1] = softc->ipf_groups[i][1];
4316         }
4317 #ifdef  IPFILTER_LOG
4318         fiop->f_log_ok = ipf_log_logok(softc, IPL_LOGIPF);
4319         fiop->f_log_fail = ipf_log_failures(softc, IPL_LOGIPF);
4320         fiop->f_logging = 1;
4321 #else
4322         fiop->f_log_ok = 0;
4323         fiop->f_log_fail = 0;
4324         fiop->f_logging = 0;
4325 #endif
4326         fiop->f_defpass = softc->ipf_pass;
4327         fiop->f_features = ipf_features;
4328
4329 #ifdef IPFILTER_COMPAT
4330         sprintf(fiop->f_version, "IP Filter: v%d.%d.%d",
4331                 (rev / 1000000) % 100,
4332                 (rev / 10000) % 100,
4333                 (rev / 100) % 100);
4334 #else
4335         rev = rev;
4336         (void) strncpy(fiop->f_version, ipfilter_version,
4337                        sizeof(fiop->f_version));
4338 #endif
4339 }
4340
4341
4342 #ifdef  USE_INET6
4343 int icmptoicmp6types[ICMP_MAXTYPE+1] = {
4344         ICMP6_ECHO_REPLY,       /* 0: ICMP_ECHOREPLY */
4345         -1,                     /* 1: UNUSED */
4346         -1,                     /* 2: UNUSED */
4347         ICMP6_DST_UNREACH,      /* 3: ICMP_UNREACH */
4348         -1,                     /* 4: ICMP_SOURCEQUENCH */
4349         ND_REDIRECT,            /* 5: ICMP_REDIRECT */
4350         -1,                     /* 6: UNUSED */
4351         -1,                     /* 7: UNUSED */
4352         ICMP6_ECHO_REQUEST,     /* 8: ICMP_ECHO */
4353         -1,                     /* 9: UNUSED */
4354         -1,                     /* 10: UNUSED */
4355         ICMP6_TIME_EXCEEDED,    /* 11: ICMP_TIMXCEED */
4356         ICMP6_PARAM_PROB,       /* 12: ICMP_PARAMPROB */
4357         -1,                     /* 13: ICMP_TSTAMP */
4358         -1,                     /* 14: ICMP_TSTAMPREPLY */
4359         -1,                     /* 15: ICMP_IREQ */
4360         -1,                     /* 16: ICMP_IREQREPLY */
4361         -1,                     /* 17: ICMP_MASKREQ */
4362         -1,                     /* 18: ICMP_MASKREPLY */
4363 };
4364
4365
4366 int     icmptoicmp6unreach[ICMP_MAX_UNREACH] = {
4367         ICMP6_DST_UNREACH_ADDR,         /* 0: ICMP_UNREACH_NET */
4368         ICMP6_DST_UNREACH_ADDR,         /* 1: ICMP_UNREACH_HOST */
4369         -1,                             /* 2: ICMP_UNREACH_PROTOCOL */
4370         ICMP6_DST_UNREACH_NOPORT,       /* 3: ICMP_UNREACH_PORT */
4371         -1,                             /* 4: ICMP_UNREACH_NEEDFRAG */
4372         ICMP6_DST_UNREACH_NOTNEIGHBOR,  /* 5: ICMP_UNREACH_SRCFAIL */
4373         ICMP6_DST_UNREACH_ADDR,         /* 6: ICMP_UNREACH_NET_UNKNOWN */
4374         ICMP6_DST_UNREACH_ADDR,         /* 7: ICMP_UNREACH_HOST_UNKNOWN */
4375         -1,                             /* 8: ICMP_UNREACH_ISOLATED */
4376         ICMP6_DST_UNREACH_ADMIN,        /* 9: ICMP_UNREACH_NET_PROHIB */
4377         ICMP6_DST_UNREACH_ADMIN,        /* 10: ICMP_UNREACH_HOST_PROHIB */
4378         -1,                             /* 11: ICMP_UNREACH_TOSNET */
4379         -1,                             /* 12: ICMP_UNREACH_TOSHOST */
4380         ICMP6_DST_UNREACH_ADMIN,        /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */
4381 };
4382 int     icmpreplytype6[ICMP6_MAXTYPE + 1];
4383 #endif
4384
4385 int     icmpreplytype4[ICMP_MAXTYPE + 1];
4386
4387
4388 /* ------------------------------------------------------------------------ */
4389 /* Function:    ipf_matchicmpqueryreply                                     */
4390 /* Returns:     int - 1 if "icmp" is a valid reply to "ic" else 0.          */
4391 /* Parameters:  v(I)    - IP protocol version (4 or 6)                      */
4392 /*              ic(I)   - ICMP information                                  */
4393 /*              icmp(I) - ICMP packet header                                */
4394 /*              rev(I)  - direction (0 = forward/1 = reverse) of packet     */
4395 /*                                                                          */
4396 /* Check if the ICMP packet defined by the header pointed to by icmp is a   */
4397 /* reply to one as described by what's in ic.  If it is a match, return 1,  */
4398 /* else return 0 for no match.                                              */
4399 /* ------------------------------------------------------------------------ */
4400 int
4401 ipf_matchicmpqueryreply(v, ic, icmp, rev)
4402         int v;
4403         icmpinfo_t *ic;
4404         icmphdr_t *icmp;
4405         int rev;
4406 {
4407         int ictype;
4408
4409         ictype = ic->ici_type;
4410
4411         if (v == 4) {
4412                 /*
4413                  * If we matched its type on the way in, then when going out
4414                  * it will still be the same type.
4415                  */
4416                 if ((!rev && (icmp->icmp_type == ictype)) ||
4417                     (rev && (icmpreplytype4[ictype] == icmp->icmp_type))) {
4418                         if (icmp->icmp_type != ICMP_ECHOREPLY)
4419                                 return 1;
4420                         if (icmp->icmp_id == ic->ici_id)
4421                                 return 1;
4422                 }
4423         }
4424 #ifdef  USE_INET6
4425         else if (v == 6) {
4426                 if ((!rev && (icmp->icmp_type == ictype)) ||
4427                     (rev && (icmpreplytype6[ictype] == icmp->icmp_type))) {
4428                         if (icmp->icmp_type != ICMP6_ECHO_REPLY)
4429                                 return 1;
4430                         if (icmp->icmp_id == ic->ici_id)
4431                                 return 1;
4432                 }
4433         }
4434 #endif
4435         return 0;
4436 }
4437
4438
4439 /* ------------------------------------------------------------------------ */
4440 /* Function:    ipf_rule_compare                                            */
4441 /* Parameters:  fr1(I) - first rule structure to compare                    */
4442 /*              fr2(I) - second rule structure to compare                   */
4443 /* Returns:     int    - 0 == rules are the same, else mismatch             */
4444 /*                                                                          */
4445 /* Compare two rules and return 0 if they match or a number indicating      */
4446 /* which of the individual checks failed.                                   */
4447 /* ------------------------------------------------------------------------ */
4448 static int
4449 ipf_rule_compare(frentry_t *fr1, frentry_t *fr2)
4450 {
4451         if (fr1->fr_cksum != fr2->fr_cksum)
4452                 return 1;
4453         if (fr1->fr_size != fr2->fr_size)
4454                 return 2;
4455         if (fr1->fr_dsize != fr2->fr_dsize)
4456                 return 3;
4457         if (bcmp((char *)&fr1->fr_func, (char *)&fr2->fr_func,
4458                  fr1->fr_size - offsetof(struct frentry, fr_func)) != 0)
4459                 return 4;
4460         if (fr1->fr_data && !fr2->fr_data)
4461                 return 5;
4462         if (!fr1->fr_data && fr2->fr_data)
4463                 return 6;
4464         if (fr1->fr_data) {
4465                 if (bcmp(fr1->fr_caddr, fr2->fr_caddr, fr1->fr_dsize))
4466                         return 7;
4467         }
4468         return 0;
4469 }
4470
4471
4472 /* ------------------------------------------------------------------------ */
4473 /* Function:    frrequest                                                   */
4474 /* Returns:     int - 0 == success, > 0 == errno value                      */
4475 /* Parameters:  unit(I)     - device for which this is for                  */
4476 /*              req(I)      - ioctl command (SIOC*)                         */
4477 /*              data(I)     - pointr to ioctl data                          */
4478 /*              set(I)      - 1 or 0 (filter set)                           */
4479 /*              makecopy(I) - flag indicating whether data points to a rule */
4480 /*                            in kernel space & hence doesn't need copying. */
4481 /*                                                                          */
4482 /* This function handles all the requests which operate on the list of      */
4483 /* filter rules.  This includes adding, deleting, insertion.  It is also    */
4484 /* responsible for creating groups when a "head" rule is loaded.  Interface */
4485 /* names are resolved here and other sanity checks are made on the content  */
4486 /* of the rule structure being loaded.  If a rule has user defined timeouts */
4487 /* then make sure they are created and initialised before exiting.          */
4488 /* ------------------------------------------------------------------------ */
4489 int
4490 frrequest(softc, unit, req, data, set, makecopy)
4491         ipf_main_softc_t *softc;
4492         int unit;
4493         ioctlcmd_t req;
4494         int set, makecopy;
4495         caddr_t data;
4496 {
4497         int error = 0, in, family, addrem, need_free = 0;
4498         frentry_t frd, *fp, *f, **fprev, **ftail;
4499         void *ptr, *uptr, *cptr;
4500         u_int *p, *pp;
4501         frgroup_t *fg;
4502         char *group;
4503
4504         ptr = NULL;
4505         cptr = NULL;
4506         fg = NULL;
4507         fp = &frd;
4508         if (makecopy != 0) {
4509                 bzero(fp, sizeof(frd));
4510                 error = ipf_inobj(softc, data, NULL, fp, IPFOBJ_FRENTRY);
4511                 if (error) {
4512                         return error;
4513                 }
4514                 if ((fp->fr_type & FR_T_BUILTIN) != 0) {
4515                         IPFERROR(6);
4516                         return EINVAL;
4517                 }
4518                 KMALLOCS(f, frentry_t *, fp->fr_size);
4519                 if (f == NULL) {
4520                         IPFERROR(131);
4521                         return ENOMEM;
4522                 }
4523                 bzero(f, fp->fr_size);
4524                 error = ipf_inobjsz(softc, data, f, IPFOBJ_FRENTRY,
4525                                     fp->fr_size);
4526                 if (error) {
4527                         KFREES(f, fp->fr_size);
4528                         return error;
4529                 }
4530
4531                 fp = f;
4532                 f = NULL;
4533                 fp->fr_next = NULL;
4534                 fp->fr_dnext = NULL;
4535                 fp->fr_pnext = NULL;
4536                 fp->fr_pdnext = NULL;
4537                 fp->fr_grp = NULL;
4538                 fp->fr_grphead = NULL;
4539                 fp->fr_icmpgrp = NULL;
4540                 fp->fr_isc = (void *)-1;
4541                 fp->fr_ptr = NULL;
4542                 fp->fr_ref = 0;
4543                 fp->fr_flags |= FR_COPIED;
4544         } else {
4545                 fp = (frentry_t *)data;
4546                 if ((fp->fr_type & FR_T_BUILTIN) == 0) {
4547                         IPFERROR(7);
4548                         return EINVAL;
4549                 }
4550                 fp->fr_flags &= ~FR_COPIED;
4551         }
4552
4553         if (((fp->fr_dsize == 0) && (fp->fr_data != NULL)) ||
4554             ((fp->fr_dsize != 0) && (fp->fr_data == NULL))) {
4555                 IPFERROR(8);
4556                 error = EINVAL;
4557                 goto donenolock;
4558         }
4559
4560         family = fp->fr_family;
4561         uptr = fp->fr_data;
4562
4563         if (req == (ioctlcmd_t)SIOCINAFR || req == (ioctlcmd_t)SIOCINIFR ||
4564             req == (ioctlcmd_t)SIOCADAFR || req == (ioctlcmd_t)SIOCADIFR)
4565                 addrem = 0;
4566         else if (req == (ioctlcmd_t)SIOCRMAFR || req == (ioctlcmd_t)SIOCRMIFR)
4567                 addrem = 1;
4568         else if (req == (ioctlcmd_t)SIOCZRLST)
4569                 addrem = 2;
4570         else {
4571                 IPFERROR(9);
4572                 error = EINVAL;
4573                 goto donenolock;
4574         }
4575
4576         /*
4577          * Only filter rules for IPv4 or IPv6 are accepted.
4578          */
4579         if (family == AF_INET) {
4580                 /*EMPTY*/;
4581 #ifdef  USE_INET6
4582         } else if (family == AF_INET6) {
4583                 /*EMPTY*/;
4584 #endif
4585         } else if (family != 0) {
4586                 IPFERROR(10);
4587                 error = EINVAL;
4588                 goto donenolock;
4589         }
4590
4591         /*
4592          * If the rule is being loaded from user space, i.e. we had to copy it
4593          * into kernel space, then do not trust the function pointer in the
4594          * rule.
4595          */
4596         if ((makecopy == 1) && (fp->fr_func != NULL)) {
4597                 if (ipf_findfunc(fp->fr_func) == NULL) {
4598                         IPFERROR(11);
4599                         error = ESRCH;
4600                         goto donenolock;
4601                 }
4602
4603                 if (addrem == 0) {
4604                         error = ipf_funcinit(softc, fp);
4605                         if (error != 0)
4606                                 goto donenolock;
4607                 }
4608         }
4609         if ((fp->fr_flags & FR_CALLNOW) &&
4610             ((fp->fr_func == NULL) || (fp->fr_func == (ipfunc_t)-1))) {
4611                 IPFERROR(142);
4612                 error = ESRCH;
4613                 goto donenolock;
4614         }
4615         if (((fp->fr_flags & FR_CMDMASK) == FR_CALL) &&
4616             ((fp->fr_func == NULL) || (fp->fr_func == (ipfunc_t)-1))) {
4617                 IPFERROR(143);
4618                 error = ESRCH;
4619                 goto donenolock;
4620         }
4621
4622         ptr = NULL;
4623         cptr = NULL;
4624
4625         if (FR_ISACCOUNT(fp->fr_flags))
4626                 unit = IPL_LOGCOUNT;
4627
4628         /*
4629          * Check that each group name in the rule has a start index that
4630          * is valid.
4631          */
4632         if (fp->fr_icmphead != -1) {
4633                 if ((fp->fr_icmphead < 0) ||
4634                     (fp->fr_icmphead >= fp->fr_namelen)) {
4635                         IPFERROR(136);
4636                         error = EINVAL;
4637                         goto donenolock;
4638                 }
4639                 if (!strcmp(FR_NAME(fp, fr_icmphead), "0"))
4640                         fp->fr_names[fp->fr_icmphead] = '\0';
4641         }
4642
4643         if (fp->fr_grhead != -1) {
4644                 if ((fp->fr_grhead < 0) ||
4645                     (fp->fr_grhead >= fp->fr_namelen)) {
4646                         IPFERROR(137);
4647                         error = EINVAL;
4648                         goto donenolock;
4649                 }
4650                 if (!strcmp(FR_NAME(fp, fr_grhead), "0"))
4651                         fp->fr_names[fp->fr_grhead] = '\0';
4652         }
4653
4654         if (fp->fr_group != -1) {
4655                 if ((fp->fr_group < 0) ||
4656                     (fp->fr_group >= fp->fr_namelen)) {
4657                         IPFERROR(138);
4658                         error = EINVAL;
4659                         goto donenolock;
4660                 }
4661                 if ((req != (int)SIOCZRLST) && (fp->fr_group != -1)) {
4662                         /*
4663                          * Allow loading rules that are in groups to cause
4664                          * them to be created if they don't already exit.
4665                          */
4666                         group = FR_NAME(fp, fr_group);
4667                         if (addrem == 0) {
4668                                 fg = ipf_group_add(softc, group, NULL,
4669                                                    fp->fr_flags, unit, set);
4670                                 fp->fr_grp = fg;
4671                         } else {
4672                                 fg = ipf_findgroup(softc, group, unit,
4673                                                    set, NULL);
4674                                 if (fg == NULL) {
4675                                         IPFERROR(12);
4676                                         error = ESRCH;
4677                                         goto donenolock;
4678                                 }
4679                         }
4680
4681                         if (fg->fg_flags == 0) {
4682                                 fg->fg_flags = fp->fr_flags & FR_INOUT;
4683                         } else if (fg->fg_flags != (fp->fr_flags & FR_INOUT)) {
4684                                 IPFERROR(13);
4685                                 error = ESRCH;
4686                                 goto donenolock;
4687                         }
4688                 }
4689         } else {
4690                 /*
4691                  * If a rule is going to be part of a group then it does
4692                  * not matter whether it is an in or out rule, but if it
4693                  * isn't in a group, then it does...
4694                  */
4695                 if ((fp->fr_flags & (FR_INQUE|FR_OUTQUE)) == 0) {
4696                         IPFERROR(14);
4697                         error = EINVAL;
4698                         goto donenolock;
4699                 }
4700         }
4701         in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
4702
4703         /*
4704          * Work out which rule list this change is being applied to.
4705          */
4706         ftail = NULL;
4707         fprev = NULL;
4708         if (unit == IPL_LOGAUTH) {
4709                 if ((fp->fr_tifs[0].fd_ptr != NULL) ||
4710                     (fp->fr_tifs[1].fd_ptr != NULL) ||
4711                     (fp->fr_dif.fd_ptr != NULL) ||
4712                     (fp->fr_flags & FR_FASTROUTE)) {
4713                         softc->ipf_interror = 145;
4714                         error = EINVAL;
4715                         goto donenolock;
4716                 }
4717                 fprev = ipf_auth_rulehead(softc);
4718         } else {
4719                 if (FR_ISACCOUNT(fp->fr_flags))
4720                         fprev = &softc->ipf_acct[in][set];
4721                 else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) != 0)
4722                         fprev = &softc->ipf_rules[in][set];
4723         }
4724         if (fprev == NULL) {
4725                 IPFERROR(15);
4726                 error = ESRCH;
4727                 goto donenolock;
4728         }
4729
4730         if (fg != NULL)
4731                 fprev = &fg->fg_start;
4732
4733         /*
4734          * Copy in extra data for the rule.
4735          */
4736         if (fp->fr_dsize != 0) {
4737                 if (makecopy != 0) {
4738                         KMALLOCS(ptr, void *, fp->fr_dsize);
4739                         if (ptr == NULL) {
4740                                 IPFERROR(16);
4741                                 error = ENOMEM;
4742                                 goto donenolock;
4743                         }
4744
4745                         /*
4746                          * The bcopy case is for when the data is appended
4747                          * to the rule by ipf_in_compat().
4748                          */
4749                         if (uptr >= (void *)fp &&
4750                             uptr < (void *)((char *)fp + fp->fr_size)) {
4751                                 bcopy(uptr, ptr, fp->fr_dsize);
4752                                 error = 0;
4753                         } else {
4754                                 error = COPYIN(uptr, ptr, fp->fr_dsize);
4755                                 if (error != 0) {
4756                                         IPFERROR(17);
4757                                         error = EFAULT;
4758                                         goto donenolock;
4759                                 }
4760                         }
4761                 } else {
4762                         ptr = uptr;
4763                 }
4764                 fp->fr_data = ptr;
4765         } else {
4766                 fp->fr_data = NULL;
4767         }
4768
4769         /*
4770          * Perform per-rule type sanity checks of their members.
4771          * All code after this needs to be aware that allocated memory
4772          * may need to be free'd before exiting.
4773          */
4774         switch (fp->fr_type & ~FR_T_BUILTIN)
4775         {
4776 #if defined(IPFILTER_BPF)
4777         case FR_T_BPFOPC :
4778                 if (fp->fr_dsize == 0) {
4779                         IPFERROR(19);
4780                         error = EINVAL;
4781                         break;
4782                 }
4783                 if (!bpf_validate(ptr, fp->fr_dsize/sizeof(struct bpf_insn))) {
4784                         IPFERROR(20);
4785                         error = EINVAL;
4786                         break;
4787                 }
4788                 break;
4789 #endif
4790         case FR_T_IPF :
4791                 /*
4792                  * Preparation for error case at the bottom of this function.
4793                  */
4794                 if (fp->fr_datype == FRI_LOOKUP)
4795                         fp->fr_dstptr = NULL;
4796                 if (fp->fr_satype == FRI_LOOKUP)
4797                         fp->fr_srcptr = NULL;
4798
4799                 if (fp->fr_dsize != sizeof(fripf_t)) {
4800                         IPFERROR(21);
4801                         error = EINVAL;
4802                         break;
4803                 }
4804
4805                 /*
4806                  * Allowing a rule with both "keep state" and "with oow" is
4807                  * pointless because adding a state entry to the table will
4808                  * fail with the out of window (oow) flag set.
4809                  */
4810                 if ((fp->fr_flags & FR_KEEPSTATE) && (fp->fr_flx & FI_OOW)) {
4811                         IPFERROR(22);
4812                         error = EINVAL;
4813                         break;
4814                 }
4815
4816                 switch (fp->fr_satype)
4817                 {
4818                 case FRI_BROADCAST :
4819                 case FRI_DYNAMIC :
4820                 case FRI_NETWORK :
4821                 case FRI_NETMASKED :
4822                 case FRI_PEERADDR :
4823                         if (fp->fr_sifpidx < 0) {
4824                                 IPFERROR(23);
4825                                 error = EINVAL;
4826                         }
4827                         break;
4828                 case FRI_LOOKUP :
4829                         fp->fr_srcptr = ipf_findlookup(softc, unit, fp,
4830                                                        &fp->fr_src6,
4831                                                        &fp->fr_smsk6);
4832                         if (fp->fr_srcfunc == NULL) {
4833                                 IPFERROR(132);
4834                                 error = ESRCH;
4835                                 break;
4836                         }
4837                         break;
4838                 case FRI_NORMAL :
4839                         break;
4840                 default :
4841                         IPFERROR(133);
4842                         error = EINVAL;
4843                         break;
4844                 }
4845                 if (error != 0)
4846                         break;
4847
4848                 switch (fp->fr_datype)
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_difpidx < 0) {
4856                                 IPFERROR(24);
4857                                 error = EINVAL;
4858                         }
4859                         break;
4860                 case FRI_LOOKUP :
4861                         fp->fr_dstptr = ipf_findlookup(softc, unit, fp,
4862                                                        &fp->fr_dst6,
4863                                                        &fp->fr_dmsk6);
4864                         if (fp->fr_dstfunc == NULL) {
4865                                 IPFERROR(134);
4866                                 error = ESRCH;
4867                         }
4868                         break;
4869                 case FRI_NORMAL :
4870                         break;
4871                 default :
4872                         IPFERROR(135);
4873                         error = EINVAL;
4874                 }
4875                 break;
4876
4877         case FR_T_NONE :
4878         case FR_T_CALLFUNC :
4879         case FR_T_COMPIPF :
4880                 break;
4881
4882         case FR_T_IPFEXPR :
4883                 if (ipf_matcharray_verify(fp->fr_data, fp->fr_dsize) == -1) {
4884                         IPFERROR(25);
4885                         error = EINVAL;
4886                 }
4887                 break;
4888
4889         default :
4890                 IPFERROR(26);
4891                 error = EINVAL;
4892                 break;
4893         }
4894         if (error != 0)
4895                 goto donenolock;
4896
4897         if (fp->fr_tif.fd_name != -1) {
4898                 if ((fp->fr_tif.fd_name < 0) ||
4899                     (fp->fr_tif.fd_name >= fp->fr_namelen)) {
4900                         IPFERROR(139);
4901                         error = EINVAL;
4902                         goto donenolock;
4903                 }
4904         }
4905
4906         if (fp->fr_dif.fd_name != -1) {
4907                 if ((fp->fr_dif.fd_name < 0) ||
4908                     (fp->fr_dif.fd_name >= fp->fr_namelen)) {
4909                         IPFERROR(140);
4910                         error = EINVAL;
4911                         goto donenolock;
4912                 }
4913         }
4914
4915         if (fp->fr_rif.fd_name != -1) {
4916                 if ((fp->fr_rif.fd_name < 0) ||
4917                     (fp->fr_rif.fd_name >= fp->fr_namelen)) {
4918                         IPFERROR(141);
4919                         error = EINVAL;
4920                         goto donenolock;
4921                 }
4922         }
4923
4924         /*
4925          * Lookup all the interface names that are part of the rule.
4926          */
4927         error = ipf_synclist(softc, fp, NULL);
4928         if (error != 0)
4929                 goto donenolock;
4930         fp->fr_statecnt = 0;
4931         if (fp->fr_srctrack.ht_max_nodes != 0)
4932                 ipf_rb_ht_init(&fp->fr_srctrack);
4933
4934         /*
4935          * Look for an existing matching filter rule, but don't include the
4936          * next or interface pointer in the comparison (fr_next, fr_ifa).
4937          * This elminates rules which are indentical being loaded.  Checksum
4938          * the constant part of the filter rule to make comparisons quicker
4939          * (this meaning no pointers are included).
4940          */
4941         for (fp->fr_cksum = 0, p = (u_int *)&fp->fr_func, pp = &fp->fr_cksum;
4942              p < pp; p++)
4943                 fp->fr_cksum += *p;
4944         pp = (u_int *)(fp->fr_caddr + fp->fr_dsize);
4945         for (p = (u_int *)fp->fr_data; p < pp; p++)
4946                 fp->fr_cksum += *p;
4947
4948         WRITE_ENTER(&softc->ipf_mutex);
4949
4950         /*
4951          * Now that the filter rule lists are locked, we can walk the
4952          * chain of them without fear.
4953          */
4954         ftail = fprev;
4955         for (f = *ftail; (f = *ftail) != NULL; ftail = &f->fr_next) {
4956                 if (fp->fr_collect <= f->fr_collect) {
4957                         ftail = fprev;
4958                         f = NULL;
4959                         break;
4960                 }
4961                 fprev = ftail;
4962         }
4963
4964         for (; (f = *ftail) != NULL; ftail = &f->fr_next) {
4965                 if (ipf_rule_compare(fp, f) == 0)
4966                         break;
4967         }
4968
4969         /*
4970          * If zero'ing statistics, copy current to caller and zero.
4971          */
4972         if (addrem == 2) {
4973                 if (f == NULL) {
4974                         IPFERROR(27);
4975                         error = ESRCH;
4976                 } else {
4977                         /*
4978                          * Copy and reduce lock because of impending copyout.
4979                          * Well we should, but if we do then the atomicity of
4980                          * this call and the correctness of fr_hits and
4981                          * fr_bytes cannot be guaranteed.  As it is, this code
4982                          * only resets them to 0 if they are successfully
4983                          * copied out into user space.
4984                          */
4985                         bcopy((char *)f, (char *)fp, f->fr_size);
4986                         /* MUTEX_DOWNGRADE(&softc->ipf_mutex); */
4987
4988                         /*
4989                          * When we copy this rule back out, set the data
4990                          * pointer to be what it was in user space.
4991                          */
4992                         fp->fr_data = uptr;
4993                         error = ipf_outobj(softc, data, fp, IPFOBJ_FRENTRY);
4994
4995                         if (error == 0) {
4996                                 if ((f->fr_dsize != 0) && (uptr != NULL))
4997                                         error = COPYOUT(f->fr_data, uptr,
4998                                                         f->fr_dsize);
4999                                         if (error != 0) {
5000                                                 IPFERROR(28);
5001                                                 error = EFAULT;
5002                                         }
5003                                 if (error == 0) {
5004                                         f->fr_hits = 0;
5005                                         f->fr_bytes = 0;
5006                                 }
5007                         }
5008                 }
5009
5010                 if (makecopy != 0) {
5011                         if (ptr != NULL) {
5012                                 KFREES(ptr, fp->fr_dsize);
5013                         }
5014                         KFREES(fp, fp->fr_size);
5015                 }
5016                 RWLOCK_EXIT(&softc->ipf_mutex);
5017                 return error;
5018         }
5019
5020         if (!f) {
5021                 /*
5022                  * At the end of this, ftail must point to the place where the
5023                  * new rule is to be saved/inserted/added.
5024                  * For SIOCAD*FR, this should be the last rule in the group of
5025                  * rules that have equal fr_collect fields.
5026                  * For SIOCIN*FR, ...
5027                  */
5028                 if (req == (ioctlcmd_t)SIOCADAFR ||
5029                     req == (ioctlcmd_t)SIOCADIFR) {
5030
5031                         for (ftail = fprev; (f = *ftail) != NULL; ) {
5032                                 if (f->fr_collect > fp->fr_collect)
5033                                         break;
5034                                 ftail = &f->fr_next;
5035                                 fprev = ftail;
5036                         }
5037                         ftail = fprev;
5038                         f = NULL;
5039                         ptr = NULL;
5040                 } else if (req == (ioctlcmd_t)SIOCINAFR ||
5041                            req == (ioctlcmd_t)SIOCINIFR) {
5042                         while ((f = *fprev) != NULL) {
5043                                 if (f->fr_collect >= fp->fr_collect)
5044                                         break;
5045                                 fprev = &f->fr_next;
5046                         }
5047                         ftail = fprev;
5048                         if (fp->fr_hits != 0) {
5049                                 while (fp->fr_hits && (f = *ftail)) {
5050                                         if (f->fr_collect != fp->fr_collect)
5051                                                 break;
5052                                         fprev = ftail;
5053                                         ftail = &f->fr_next;
5054                                         fp->fr_hits--;
5055                                 }
5056                         }
5057                         f = NULL;
5058                         ptr = NULL;
5059                 }
5060         }
5061
5062         /*
5063          * Request to remove a rule.
5064          */
5065         if (addrem == 1) {
5066                 if (!f) {
5067                         IPFERROR(29);
5068                         error = ESRCH;
5069                 } else {
5070                         /*
5071                          * Do not allow activity from user space to interfere
5072                          * with rules not loaded that way.
5073                          */
5074                         if ((makecopy == 1) && !(f->fr_flags & FR_COPIED)) {
5075                                 IPFERROR(30);
5076                                 error = EPERM;
5077                                 goto done;
5078                         }
5079
5080                         /*
5081                          * Return EBUSY if the rule is being reference by
5082                          * something else (eg state information.)
5083                          */
5084                         if (f->fr_ref > 1) {
5085                                 IPFERROR(31);
5086                                 error = EBUSY;
5087                                 goto done;
5088                         }
5089 #ifdef  IPFILTER_SCAN
5090                         if (f->fr_isctag != -1 &&
5091                             (f->fr_isc != (struct ipscan *)-1))
5092                                 ipf_scan_detachfr(f);
5093 #endif
5094
5095                         if (unit == IPL_LOGAUTH) {
5096                                 error = ipf_auth_precmd(softc, req, f, ftail);
5097                                 goto done;
5098                         }
5099
5100                         ipf_rule_delete(softc, f, unit, set);
5101
5102                         need_free = makecopy;
5103                 }
5104         } else {
5105                 /*
5106                  * Not removing, so we must be adding/inserting a rule.
5107                  */
5108                 if (f != NULL) {
5109                         IPFERROR(32);
5110                         error = EEXIST;
5111                         goto done;
5112                 }
5113                 if (unit == IPL_LOGAUTH) {
5114                         error = ipf_auth_precmd(softc, req, fp, ftail);
5115                         goto done;
5116                 }
5117
5118                 MUTEX_NUKE(&fp->fr_lock);
5119                 MUTEX_INIT(&fp->fr_lock, "filter rule lock");
5120                 if (fp->fr_die != 0)
5121                         ipf_rule_expire_insert(softc, fp, set);
5122
5123                 fp->fr_hits = 0;
5124                 if (makecopy != 0)
5125                         fp->fr_ref = 1;
5126                 fp->fr_pnext = ftail;
5127                 fp->fr_next = *ftail;
5128                 if (fp->fr_next != NULL)
5129                         fp->fr_next->fr_pnext = &fp->fr_next;
5130                 *ftail = fp;
5131                 if (addrem == 0)
5132                         ipf_fixskip(ftail, fp, 1);
5133
5134                 fp->fr_icmpgrp = NULL;
5135                 if (fp->fr_icmphead != -1) {
5136                         group = FR_NAME(fp, fr_icmphead);
5137                         fg = ipf_group_add(softc, group, fp, 0, unit, set);
5138                         fp->fr_icmpgrp = fg;
5139                 }
5140
5141                 fp->fr_grphead = NULL;
5142                 if (fp->fr_grhead != -1) {
5143                         group = FR_NAME(fp, fr_grhead);
5144                         fg = ipf_group_add(softc, group, fp, fp->fr_flags,
5145                                            unit, set);
5146                         fp->fr_grphead = fg;
5147                 }
5148         }
5149 done:
5150         RWLOCK_EXIT(&softc->ipf_mutex);
5151 donenolock:
5152         if (need_free || (error != 0)) {
5153                 if ((fp->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) {
5154                         if ((fp->fr_satype == FRI_LOOKUP) &&
5155                             (fp->fr_srcptr != NULL))
5156                                 ipf_lookup_deref(softc, fp->fr_srctype,
5157                                                  fp->fr_srcptr);
5158                         if ((fp->fr_datype == FRI_LOOKUP) &&
5159                             (fp->fr_dstptr != NULL))
5160                                 ipf_lookup_deref(softc, fp->fr_dsttype,
5161                                                  fp->fr_dstptr);
5162                 }
5163                 if (fp->fr_grp != NULL) {
5164                         WRITE_ENTER(&softc->ipf_mutex);
5165                         ipf_group_del(softc, fp->fr_grp, fp);
5166                         RWLOCK_EXIT(&softc->ipf_mutex);
5167                 }
5168                 if ((ptr != NULL) && (makecopy != 0)) {
5169                         KFREES(ptr, fp->fr_dsize);
5170                 }
5171                 KFREES(fp, fp->fr_size);
5172         }
5173         return (error);
5174 }
5175
5176
5177 /* ------------------------------------------------------------------------ */
5178 /* Function:   ipf_rule_delete                                              */
5179 /* Returns:    Nil                                                          */
5180 /* Parameters: softc(I) - pointer to soft context main structure            */
5181 /*             f(I)     - pointer to the rule being deleted                 */
5182 /*             ftail(I) - pointer to the pointer to f                       */
5183 /*             unit(I)  - device for which this is for                      */
5184 /*             set(I)   - 1 or 0 (filter set)                               */
5185 /*                                                                          */
5186 /* This function attempts to do what it can to delete a filter rule: remove */
5187 /* it from any linked lists and remove any groups it is responsible for.    */
5188 /* But in the end, removing a rule can only drop the reference count - we   */
5189 /* must use that as the guide for whether or not it can be freed.           */
5190 /* ------------------------------------------------------------------------ */
5191 static void
5192 ipf_rule_delete(softc, f, unit, set)
5193         ipf_main_softc_t *softc;
5194         frentry_t *f;
5195         int unit, set;
5196 {
5197
5198         /*
5199          * If fr_pdnext is set, then the rule is on the expire list, so
5200          * remove it from there.
5201          */
5202         if (f->fr_pdnext != NULL) {
5203                 *f->fr_pdnext = f->fr_dnext;
5204                 if (f->fr_dnext != NULL)
5205                         f->fr_dnext->fr_pdnext = f->fr_pdnext;
5206                 f->fr_pdnext = NULL;
5207                 f->fr_dnext = NULL;
5208         }
5209
5210         ipf_fixskip(f->fr_pnext, f, -1);
5211         if (f->fr_pnext != NULL)
5212                 *f->fr_pnext = f->fr_next;
5213         if (f->fr_next != NULL)
5214                 f->fr_next->fr_pnext = f->fr_pnext;
5215         f->fr_pnext = NULL;
5216         f->fr_next = NULL;
5217
5218         (void) ipf_derefrule(softc, &f);
5219 }
5220
5221 /* ------------------------------------------------------------------------ */
5222 /* Function:   ipf_rule_expire_insert                                       */
5223 /* Returns:    Nil                                                          */
5224 /* Parameters: softc(I) - pointer to soft context main structure            */
5225 /*             f(I)     - pointer to rule to be added to expire list        */
5226 /*             set(I)   - 1 or 0 (filter set)                               */
5227 /*                                                                          */
5228 /* If the new rule has a given expiration time, insert it into the list of  */
5229 /* expiring rules with the ones to be removed first added to the front of   */
5230 /* the list. The insertion is O(n) but it is kept sorted for quick scans at */
5231 /* expiration interval checks.                                              */
5232 /* ------------------------------------------------------------------------ */
5233 static void
5234 ipf_rule_expire_insert(softc, f, set)
5235         ipf_main_softc_t *softc;
5236         frentry_t *f;
5237         int set;
5238 {
5239         frentry_t *fr;
5240
5241         /*
5242          */
5243
5244         f->fr_die = softc->ipf_ticks + IPF_TTLVAL(f->fr_die);
5245         for (fr = softc->ipf_rule_explist[set]; fr != NULL;
5246              fr = fr->fr_dnext) {
5247                 if (f->fr_die < fr->fr_die)
5248                         break;
5249                 if (fr->fr_dnext == NULL) {
5250                         /*
5251                          * We've got to the last rule and everything
5252                          * wanted to be expired before this new node,
5253                          * so we have to tack it on the end...
5254                          */
5255                         fr->fr_dnext = f;
5256                         f->fr_pdnext = &fr->fr_dnext;
5257                         fr = NULL;
5258                         break;
5259                 }
5260         }
5261
5262         if (softc->ipf_rule_explist[set] == NULL) {
5263                 softc->ipf_rule_explist[set] = f;
5264                 f->fr_pdnext = &softc->ipf_rule_explist[set];
5265         } else if (fr != NULL) {
5266                 f->fr_dnext = fr;
5267                 f->fr_pdnext = fr->fr_pdnext;
5268                 fr->fr_pdnext = &f->fr_dnext;
5269         }
5270 }
5271
5272
5273 /* ------------------------------------------------------------------------ */
5274 /* Function:   ipf_findlookup                                               */
5275 /* Returns:    NULL = failure, else success                                 */
5276 /* Parameters: softc(I) - pointer to soft context main structure            */
5277 /*             unit(I)  - ipf device we want to find match for              */
5278 /*             fp(I)    - rule for which lookup is for                      */
5279 /*             addrp(I) - pointer to lookup information in address struct   */
5280 /*             maskp(O) - pointer to lookup information for storage         */
5281 /*                                                                          */
5282 /* When using pools and hash tables to store addresses for matching in      */
5283 /* rules, it is necessary to resolve both the object referred to by the     */
5284 /* name or address (and return that pointer) and also provide the means by  */
5285 /* which to determine if an address belongs to that object to make the      */
5286 /* packet matching quicker.                                                 */
5287 /* ------------------------------------------------------------------------ */
5288 static void *
5289 ipf_findlookup(softc, unit, fr, addrp, maskp)
5290         ipf_main_softc_t *softc;
5291         int unit;
5292         frentry_t *fr;
5293         i6addr_t *addrp, *maskp;
5294 {
5295         void *ptr = NULL;
5296
5297         switch (addrp->iplookupsubtype)
5298         {
5299         case 0 :
5300                 ptr = ipf_lookup_res_num(softc, unit, addrp->iplookuptype,
5301                                          addrp->iplookupnum,
5302                                          &maskp->iplookupfunc);
5303                 break;
5304         case 1 :
5305                 if (addrp->iplookupname < 0)
5306                         break;
5307                 if (addrp->iplookupname >= fr->fr_namelen)
5308                         break;
5309                 ptr = ipf_lookup_res_name(softc, unit, addrp->iplookuptype,
5310                                           fr->fr_names + addrp->iplookupname,
5311                                           &maskp->iplookupfunc);
5312                 break;
5313         default :
5314                 break;
5315         }
5316
5317         return ptr;
5318 }
5319
5320
5321 /* ------------------------------------------------------------------------ */
5322 /* Function:    ipf_funcinit                                                */
5323 /* Returns:     int - 0 == success, else ESRCH: cannot resolve rule details */
5324 /* Parameters:  softc(I) - pointer to soft context main structure           */
5325 /*              fr(I)    - pointer to filter rule                           */
5326 /*                                                                          */
5327 /* If a rule is a call rule, then check if the function it points to needs  */
5328 /* an init function to be called now the rule has been loaded.              */
5329 /* ------------------------------------------------------------------------ */
5330 static int
5331 ipf_funcinit(softc, fr)
5332         ipf_main_softc_t *softc;
5333         frentry_t *fr;
5334 {
5335         ipfunc_resolve_t *ft;
5336         int err;
5337
5338         IPFERROR(34);
5339         err = ESRCH;
5340
5341         for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5342                 if (ft->ipfu_addr == fr->fr_func) {
5343                         err = 0;
5344                         if (ft->ipfu_init != NULL)
5345                                 err = (*ft->ipfu_init)(softc, fr);
5346                         break;
5347                 }
5348         return err;
5349 }
5350
5351
5352 /* ------------------------------------------------------------------------ */
5353 /* Function:    ipf_funcfini                                                */
5354 /* Returns:     Nil                                                         */
5355 /* Parameters:  softc(I) - pointer to soft context main structure           */
5356 /*              fr(I)    - pointer to filter rule                           */
5357 /*                                                                          */
5358 /* For a given filter rule, call the matching "fini" function if the rule   */
5359 /* is using a known function that would have resulted in the "init" being   */
5360 /* called for ealier.                                                       */
5361 /* ------------------------------------------------------------------------ */
5362 static void
5363 ipf_funcfini(softc, fr)
5364         ipf_main_softc_t *softc;
5365         frentry_t *fr;
5366 {
5367         ipfunc_resolve_t *ft;
5368
5369         for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5370                 if (ft->ipfu_addr == fr->fr_func) {
5371                         if (ft->ipfu_fini != NULL)
5372                                 (void) (*ft->ipfu_fini)(softc, fr);
5373                         break;
5374                 }
5375 }
5376
5377
5378 /* ------------------------------------------------------------------------ */
5379 /* Function:    ipf_findfunc                                                */
5380 /* Returns:     ipfunc_t - pointer to function if found, else NULL          */
5381 /* Parameters:  funcptr(I) - function pointer to lookup                     */
5382 /*                                                                          */
5383 /* Look for a function in the table of known functions.                     */
5384 /* ------------------------------------------------------------------------ */
5385 static ipfunc_t
5386 ipf_findfunc(funcptr)
5387         ipfunc_t funcptr;
5388 {
5389         ipfunc_resolve_t *ft;
5390
5391         for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5392                 if (ft->ipfu_addr == funcptr)
5393                         return funcptr;
5394         return NULL;
5395 }
5396
5397
5398 /* ------------------------------------------------------------------------ */
5399 /* Function:    ipf_resolvefunc                                             */
5400 /* Returns:     int - 0 == success, else error                              */
5401 /* Parameters:  data(IO) - ioctl data pointer to ipfunc_resolve_t struct    */
5402 /*                                                                          */
5403 /* Copy in a ipfunc_resolve_t structure and then fill in the missing field. */
5404 /* This will either be the function name (if the pointer is set) or the     */
5405 /* function pointer if the name is set.  When found, fill in the other one  */
5406 /* so that the entire, complete, structure can be copied back to user space.*/
5407 /* ------------------------------------------------------------------------ */
5408 int
5409 ipf_resolvefunc(softc, data)
5410         ipf_main_softc_t *softc;
5411         void *data;
5412 {
5413         ipfunc_resolve_t res, *ft;
5414         int error;
5415
5416         error = BCOPYIN(data, &res, sizeof(res));
5417         if (error != 0) {
5418                 IPFERROR(123);
5419                 return EFAULT;
5420         }
5421
5422         if (res.ipfu_addr == NULL && res.ipfu_name[0] != '\0') {
5423                 for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5424                         if (strncmp(res.ipfu_name, ft->ipfu_name,
5425                                     sizeof(res.ipfu_name)) == 0) {
5426                                 res.ipfu_addr = ft->ipfu_addr;
5427                                 res.ipfu_init = ft->ipfu_init;
5428                                 if (COPYOUT(&res, data, sizeof(res)) != 0) {
5429                                         IPFERROR(35);
5430                                         return EFAULT;
5431                                 }
5432                                 return 0;
5433                         }
5434         }
5435         if (res.ipfu_addr != NULL && res.ipfu_name[0] == '\0') {
5436                 for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5437                         if (ft->ipfu_addr == res.ipfu_addr) {
5438                                 (void) strncpy(res.ipfu_name, ft->ipfu_name,
5439                                                sizeof(res.ipfu_name));
5440                                 res.ipfu_init = ft->ipfu_init;
5441                                 if (COPYOUT(&res, data, sizeof(res)) != 0) {
5442                                         IPFERROR(36);
5443                                         return EFAULT;
5444                                 }
5445                                 return 0;
5446                         }
5447         }
5448         IPFERROR(37);
5449         return ESRCH;
5450 }
5451
5452
5453 #if !defined(_KERNEL) || (!defined(__NetBSD__) && !defined(__OpenBSD__) && \
5454      !defined(__FreeBSD__)) || \
5455     FREEBSD_LT_REV(501000) || NETBSD_LT_REV(105000000) || \
5456     OPENBSD_LT_REV(200006)
5457 /*
5458  * From: NetBSD
5459  * ppsratecheck(): packets (or events) per second limitation.
5460  */
5461 int
5462 ppsratecheck(lasttime, curpps, maxpps)
5463         struct timeval *lasttime;
5464         int *curpps;
5465         int maxpps;     /* maximum pps allowed */
5466 {
5467         struct timeval tv, delta;
5468         int rv;
5469
5470         GETKTIME(&tv);
5471
5472         delta.tv_sec = tv.tv_sec - lasttime->tv_sec;
5473         delta.tv_usec = tv.tv_usec - lasttime->tv_usec;
5474         if (delta.tv_usec < 0) {
5475                 delta.tv_sec--;
5476                 delta.tv_usec += 1000000;
5477         }
5478
5479         /*
5480          * check for 0,0 is so that the message will be seen at least once.
5481          * if more than one second have passed since the last update of
5482          * lasttime, reset the counter.
5483          *
5484          * we do increment *curpps even in *curpps < maxpps case, as some may
5485          * try to use *curpps for stat purposes as well.
5486          */
5487         if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
5488             delta.tv_sec >= 1) {
5489                 *lasttime = tv;
5490                 *curpps = 0;
5491                 rv = 1;
5492         } else if (maxpps < 0)
5493                 rv = 1;
5494         else if (*curpps < maxpps)
5495                 rv = 1;
5496         else
5497                 rv = 0;
5498         *curpps = *curpps + 1;
5499
5500         return (rv);
5501 }
5502 #endif
5503
5504
5505 /* ------------------------------------------------------------------------ */
5506 /* Function:    ipf_derefrule                                               */
5507 /* Returns:     int   - 0 == rule freed up, else rule not freed             */
5508 /* Parameters:  fr(I) - pointer to filter rule                              */
5509 /*                                                                          */
5510 /* Decrement the reference counter to a rule by one.  If it reaches zero,   */
5511 /* free it and any associated storage space being used by it.               */
5512 /* ------------------------------------------------------------------------ */
5513 int
5514 ipf_derefrule(softc, frp)
5515         ipf_main_softc_t *softc;
5516         frentry_t **frp;
5517 {
5518         frentry_t *fr;
5519         frdest_t *fdp;
5520
5521         fr = *frp;
5522         *frp = NULL;
5523
5524         MUTEX_ENTER(&fr->fr_lock);
5525         fr->fr_ref--;
5526         if (fr->fr_ref == 0) {
5527                 MUTEX_EXIT(&fr->fr_lock);
5528                 MUTEX_DESTROY(&fr->fr_lock);
5529
5530                 ipf_funcfini(softc, fr);
5531
5532                 fdp = &fr->fr_tif;
5533                 if (fdp->fd_type == FRD_DSTLIST)
5534                         ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5535
5536                 fdp = &fr->fr_rif;
5537                 if (fdp->fd_type == FRD_DSTLIST)
5538                         ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5539
5540                 fdp = &fr->fr_dif;
5541                 if (fdp->fd_type == FRD_DSTLIST)
5542                         ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5543
5544                 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF &&
5545                     fr->fr_satype == FRI_LOOKUP)
5546                         ipf_lookup_deref(softc, fr->fr_srctype, fr->fr_srcptr);
5547                 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF &&
5548                     fr->fr_datype == FRI_LOOKUP)
5549                         ipf_lookup_deref(softc, fr->fr_dsttype, fr->fr_dstptr);
5550
5551                 if (fr->fr_grp != NULL)
5552                         ipf_group_del(softc, fr->fr_grp, fr);
5553
5554                 if (fr->fr_grphead != NULL)
5555                         ipf_group_del(softc, fr->fr_grphead, fr);
5556
5557                 if (fr->fr_icmpgrp != NULL)
5558                         ipf_group_del(softc, fr->fr_icmpgrp, fr);
5559
5560                 if ((fr->fr_flags & FR_COPIED) != 0) {
5561                         if (fr->fr_dsize) {
5562                                 KFREES(fr->fr_data, fr->fr_dsize);
5563                         }
5564                         KFREES(fr, fr->fr_size);
5565                         return 0;
5566                 }
5567                 return 1;
5568         } else {
5569                 MUTEX_EXIT(&fr->fr_lock);
5570         }
5571         return -1;
5572 }
5573
5574
5575 /* ------------------------------------------------------------------------ */
5576 /* Function:    ipf_grpmapinit                                              */
5577 /* Returns:     int - 0 == success, else ESRCH because table entry not found*/
5578 /* Parameters:  fr(I) - pointer to rule to find hash table for              */
5579 /*                                                                          */
5580 /* Looks for group hash table fr_arg and stores a pointer to it in fr_ptr.  */
5581 /* fr_ptr is later used by ipf_srcgrpmap and ipf_dstgrpmap.                 */
5582 /* ------------------------------------------------------------------------ */
5583 static int
5584 ipf_grpmapinit(softc, fr)
5585         ipf_main_softc_t *softc;
5586         frentry_t *fr;
5587 {
5588         char name[FR_GROUPLEN];
5589         iphtable_t *iph;
5590
5591 #if defined(SNPRINTF) && defined(_KERNEL)
5592         SNPRINTF(name, sizeof(name), "%d", fr->fr_arg);
5593 #else
5594         (void) sprintf(name, "%d", fr->fr_arg);
5595 #endif
5596         iph = ipf_lookup_find_htable(softc, IPL_LOGIPF, name);
5597         if (iph == NULL) {
5598                 IPFERROR(38);
5599                 return ESRCH;
5600         }
5601         if ((iph->iph_flags & FR_INOUT) != (fr->fr_flags & FR_INOUT)) {
5602                 IPFERROR(39);
5603                 return ESRCH;
5604         }
5605         iph->iph_ref++;
5606         fr->fr_ptr = iph;
5607         return 0;
5608 }
5609
5610
5611 /* ------------------------------------------------------------------------ */
5612 /* Function:    ipf_grpmapfini                                              */
5613 /* Returns:     int - 0 == success, else ESRCH because table entry not found*/
5614 /* Parameters:  softc(I) - pointer to soft context main structure           */
5615 /*              fr(I)    - pointer to rule to release hash table for        */
5616 /*                                                                          */
5617 /* For rules that have had ipf_grpmapinit called, ipf_lookup_deref needs to */
5618 /* be called to undo what ipf_grpmapinit caused to be done.                 */
5619 /* ------------------------------------------------------------------------ */
5620 static int
5621 ipf_grpmapfini(softc, fr)
5622         ipf_main_softc_t *softc;
5623         frentry_t *fr;
5624 {
5625         iphtable_t *iph;
5626         iph = fr->fr_ptr;
5627         if (iph != NULL)
5628                 ipf_lookup_deref(softc, IPLT_HASH, iph);
5629         return 0;
5630 }
5631
5632
5633 /* ------------------------------------------------------------------------ */
5634 /* Function:    ipf_srcgrpmap                                               */
5635 /* Returns:     frentry_t * - pointer to "new last matching" rule or NULL   */
5636 /* Parameters:  fin(I)    - pointer to packet information                   */
5637 /*              passp(IO) - pointer to current/new filter decision (unused) */
5638 /*                                                                          */
5639 /* Look for a rule group head in a hash table, using the source address as  */
5640 /* the key, and descend into that group and continue matching rules against */
5641 /* the packet.                                                              */
5642 /* ------------------------------------------------------------------------ */
5643 frentry_t *
5644 ipf_srcgrpmap(fin, passp)
5645         fr_info_t *fin;
5646         u_32_t *passp;
5647 {
5648         frgroup_t *fg;
5649         void *rval;
5650
5651         rval = ipf_iphmfindgroup(fin->fin_main_soft, fin->fin_fr->fr_ptr,
5652                                  &fin->fin_src);
5653         if (rval == NULL)
5654                 return NULL;
5655
5656         fg = rval;
5657         fin->fin_fr = fg->fg_start;
5658         (void) ipf_scanlist(fin, *passp);
5659         return fin->fin_fr;
5660 }
5661
5662
5663 /* ------------------------------------------------------------------------ */
5664 /* Function:    ipf_dstgrpmap                                               */
5665 /* Returns:     frentry_t * - pointer to "new last matching" rule or NULL   */
5666 /* Parameters:  fin(I)    - pointer to packet information                   */
5667 /*              passp(IO) - pointer to current/new filter decision (unused) */
5668 /*                                                                          */
5669 /* Look for a rule group head in a hash table, using the destination        */
5670 /* address as the key, and descend into that group and continue matching    */
5671 /* rules against  the packet.                                               */
5672 /* ------------------------------------------------------------------------ */
5673 frentry_t *
5674 ipf_dstgrpmap(fin, passp)
5675         fr_info_t *fin;
5676         u_32_t *passp;
5677 {
5678         frgroup_t *fg;
5679         void *rval;
5680
5681         rval = ipf_iphmfindgroup(fin->fin_main_soft, fin->fin_fr->fr_ptr,
5682                                  &fin->fin_dst);
5683         if (rval == NULL)
5684                 return NULL;
5685
5686         fg = rval;
5687         fin->fin_fr = fg->fg_start;
5688         (void) ipf_scanlist(fin, *passp);
5689         return fin->fin_fr;
5690 }
5691
5692 /*
5693  * Queue functions
5694  * ===============
5695  * These functions manage objects on queues for efficient timeouts.  There
5696  * are a number of system defined queues as well as user defined timeouts.
5697  * It is expected that a lock is held in the domain in which the queue
5698  * belongs (i.e. either state or NAT) when calling any of these functions
5699  * that prevents ipf_freetimeoutqueue() from being called at the same time
5700  * as any other.
5701  */
5702
5703
5704 /* ------------------------------------------------------------------------ */
5705 /* Function:    ipf_addtimeoutqueue                                         */
5706 /* Returns:     struct ifqtq * - NULL if malloc fails, else pointer to      */
5707 /*                               timeout queue with given interval.         */
5708 /* Parameters:  parent(I)  - pointer to pointer to parent node of this list */
5709 /*                           of interface queues.                           */
5710 /*              seconds(I) - timeout value in seconds for this queue.       */
5711 /*                                                                          */
5712 /* This routine first looks for a timeout queue that matches the interval   */
5713 /* being requested.  If it finds one, increments the reference counter and  */
5714 /* returns a pointer to it.  If none are found, it allocates a new one and  */
5715 /* inserts it at the top of the list.                                       */
5716 /*                                                                          */
5717 /* Locking.                                                                 */
5718 /* It is assumed that the caller of this function has an appropriate lock   */
5719 /* held (exclusively) in the domain that encompases 'parent'.               */
5720 /* ------------------------------------------------------------------------ */
5721 ipftq_t *
5722 ipf_addtimeoutqueue(softc, parent, seconds)
5723         ipf_main_softc_t *softc;
5724         ipftq_t **parent;
5725         u_int seconds;
5726 {
5727         ipftq_t *ifq;
5728         u_int period;
5729
5730         period = seconds * IPF_HZ_DIVIDE;
5731
5732         MUTEX_ENTER(&softc->ipf_timeoutlock);
5733         for (ifq = *parent; ifq != NULL; ifq = ifq->ifq_next) {
5734                 if (ifq->ifq_ttl == period) {
5735                         /*
5736                          * Reset the delete flag, if set, so the structure
5737                          * gets reused rather than freed and reallocated.
5738                          */
5739                         MUTEX_ENTER(&ifq->ifq_lock);
5740                         ifq->ifq_flags &= ~IFQF_DELETE;
5741                         ifq->ifq_ref++;
5742                         MUTEX_EXIT(&ifq->ifq_lock);
5743                         MUTEX_EXIT(&softc->ipf_timeoutlock);
5744
5745                         return ifq;
5746                 }
5747         }
5748
5749         KMALLOC(ifq, ipftq_t *);
5750         if (ifq != NULL) {
5751                 MUTEX_NUKE(&ifq->ifq_lock);
5752                 IPFTQ_INIT(ifq, period, "ipftq mutex");
5753                 ifq->ifq_next = *parent;
5754                 ifq->ifq_pnext = parent;
5755                 ifq->ifq_flags = IFQF_USER;
5756                 ifq->ifq_ref++;
5757                 *parent = ifq;
5758                 softc->ipf_userifqs++;
5759         }
5760         MUTEX_EXIT(&softc->ipf_timeoutlock);
5761         return ifq;
5762 }
5763
5764
5765 /* ------------------------------------------------------------------------ */
5766 /* Function:    ipf_deletetimeoutqueue                                      */
5767 /* Returns:     int    - new reference count value of the timeout queue     */
5768 /* Parameters:  ifq(I) - timeout queue which is losing a reference.         */
5769 /* Locks:       ifq->ifq_lock                                               */
5770 /*                                                                          */
5771 /* This routine must be called when we're discarding a pointer to a timeout */
5772 /* queue object, taking care of the reference counter.                      */
5773 /*                                                                          */
5774 /* Now that this just sets a DELETE flag, it requires the expire code to    */
5775 /* check the list of user defined timeout queues and call the free function */
5776 /* below (currently commented out) to stop memory leaking.  It is done this */
5777 /* way because the locking may not be sufficient to safely do a free when   */
5778 /* this function is called.                                                 */
5779 /* ------------------------------------------------------------------------ */
5780 int
5781 ipf_deletetimeoutqueue(ifq)
5782         ipftq_t *ifq;
5783 {
5784
5785         ifq->ifq_ref--;
5786         if ((ifq->ifq_ref == 0) && ((ifq->ifq_flags & IFQF_USER) != 0)) {
5787                 ifq->ifq_flags |= IFQF_DELETE;
5788         }
5789
5790         return ifq->ifq_ref;
5791 }
5792
5793
5794 /* ------------------------------------------------------------------------ */
5795 /* Function:    ipf_freetimeoutqueue                                        */
5796 /* Parameters:  ifq(I) - timeout queue which is losing a reference.         */
5797 /* Returns:     Nil                                                         */
5798 /*                                                                          */
5799 /* Locking:                                                                 */
5800 /* It is assumed that the caller of this function has an appropriate lock   */
5801 /* held (exclusively) in the domain that encompases the callers "domain".   */
5802 /* The ifq_lock for this structure should not be held.                      */
5803 /*                                                                          */
5804 /* Remove a user defined timeout queue from the list of queues it is in and */
5805 /* tidy up after this is done.                                              */
5806 /* ------------------------------------------------------------------------ */
5807 void
5808 ipf_freetimeoutqueue(softc, ifq)
5809         ipf_main_softc_t *softc;
5810         ipftq_t *ifq;
5811 {
5812
5813         if (((ifq->ifq_flags & IFQF_DELETE) == 0) || (ifq->ifq_ref != 0) ||
5814             ((ifq->ifq_flags & IFQF_USER) == 0)) {
5815                 printf("ipf_freetimeoutqueue(%lx) flags 0x%x ttl %d ref %d\n",
5816                        (u_long)ifq, ifq->ifq_flags, ifq->ifq_ttl,
5817                        ifq->ifq_ref);
5818                 return;
5819         }
5820
5821         /*
5822          * Remove from its position in the list.
5823          */
5824         *ifq->ifq_pnext = ifq->ifq_next;
5825         if (ifq->ifq_next != NULL)
5826                 ifq->ifq_next->ifq_pnext = ifq->ifq_pnext;
5827         ifq->ifq_next = NULL;
5828         ifq->ifq_pnext = NULL;
5829
5830         MUTEX_DESTROY(&ifq->ifq_lock);
5831         ATOMIC_DEC(softc->ipf_userifqs);
5832         KFREE(ifq);
5833 }
5834
5835
5836 /* ------------------------------------------------------------------------ */
5837 /* Function:    ipf_deletequeueentry                                        */
5838 /* Returns:     Nil                                                         */
5839 /* Parameters:  tqe(I) - timeout queue entry to delete                      */
5840 /*                                                                          */
5841 /* Remove a tail queue entry from its queue and make it an orphan.          */
5842 /* ipf_deletetimeoutqueue is called to make sure the reference count on the */
5843 /* queue is correct.  We can't, however, call ipf_freetimeoutqueue because  */
5844 /* the correct lock(s) may not be held that would make it safe to do so.    */
5845 /* ------------------------------------------------------------------------ */
5846 void
5847 ipf_deletequeueentry(tqe)
5848         ipftqent_t *tqe;
5849 {
5850         ipftq_t *ifq;
5851
5852         ifq = tqe->tqe_ifq;
5853
5854         MUTEX_ENTER(&ifq->ifq_lock);
5855
5856         if (tqe->tqe_pnext != NULL) {
5857                 *tqe->tqe_pnext = tqe->tqe_next;
5858                 if (tqe->tqe_next != NULL)
5859                         tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5860                 else    /* we must be the tail anyway */
5861                         ifq->ifq_tail = tqe->tqe_pnext;
5862
5863                 tqe->tqe_pnext = NULL;
5864                 tqe->tqe_ifq = NULL;
5865         }
5866
5867         (void) ipf_deletetimeoutqueue(ifq);
5868         ASSERT(ifq->ifq_ref > 0);
5869
5870         MUTEX_EXIT(&ifq->ifq_lock);
5871 }
5872
5873
5874 /* ------------------------------------------------------------------------ */
5875 /* Function:    ipf_queuefront                                              */
5876 /* Returns:     Nil                                                         */
5877 /* Parameters:  tqe(I) - pointer to timeout queue entry                     */
5878 /*                                                                          */
5879 /* Move a queue entry to the front of the queue, if it isn't already there. */
5880 /* ------------------------------------------------------------------------ */
5881 void
5882 ipf_queuefront(tqe)
5883         ipftqent_t *tqe;
5884 {
5885         ipftq_t *ifq;
5886
5887         ifq = tqe->tqe_ifq;
5888         if (ifq == NULL)
5889                 return;
5890
5891         MUTEX_ENTER(&ifq->ifq_lock);
5892         if (ifq->ifq_head != tqe) {
5893                 *tqe->tqe_pnext = tqe->tqe_next;
5894                 if (tqe->tqe_next)
5895                         tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5896                 else
5897                         ifq->ifq_tail = tqe->tqe_pnext;
5898
5899                 tqe->tqe_next = ifq->ifq_head;
5900                 ifq->ifq_head->tqe_pnext = &tqe->tqe_next;
5901                 ifq->ifq_head = tqe;
5902                 tqe->tqe_pnext = &ifq->ifq_head;
5903         }
5904         MUTEX_EXIT(&ifq->ifq_lock);
5905 }
5906
5907
5908 /* ------------------------------------------------------------------------ */
5909 /* Function:    ipf_queueback                                               */
5910 /* Returns:     Nil                                                         */
5911 /* Parameters:  ticks(I) - ipf tick time to use with this call              */
5912 /*              tqe(I)   - pointer to timeout queue entry                   */
5913 /*                                                                          */
5914 /* Move a queue entry to the back of the queue, if it isn't already there.  */
5915 /* We use use ticks to calculate the expiration and mark for when we last   */
5916 /* touched the structure.                                                   */
5917 /* ------------------------------------------------------------------------ */
5918 void
5919 ipf_queueback(ticks, tqe)
5920         u_long ticks;
5921         ipftqent_t *tqe;
5922 {
5923         ipftq_t *ifq;
5924
5925         ifq = tqe->tqe_ifq;
5926         if (ifq == NULL)
5927                 return;
5928         tqe->tqe_die = ticks + ifq->ifq_ttl;
5929         tqe->tqe_touched = ticks;
5930
5931         MUTEX_ENTER(&ifq->ifq_lock);
5932         if (tqe->tqe_next != NULL) {            /* at the end already ? */
5933                 /*
5934                  * Remove from list
5935                  */
5936                 *tqe->tqe_pnext = tqe->tqe_next;
5937                 tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5938
5939                 /*
5940                  * Make it the last entry.
5941                  */
5942                 tqe->tqe_next = NULL;
5943                 tqe->tqe_pnext = ifq->ifq_tail;
5944                 *ifq->ifq_tail = tqe;
5945                 ifq->ifq_tail = &tqe->tqe_next;
5946         }
5947         MUTEX_EXIT(&ifq->ifq_lock);
5948 }
5949
5950
5951 /* ------------------------------------------------------------------------ */
5952 /* Function:    ipf_queueappend                                             */
5953 /* Returns:     Nil                                                         */
5954 /* Parameters:  ticks(I)  - ipf tick time to use with this call             */
5955 /*              tqe(I)    - pointer to timeout queue entry                  */
5956 /*              ifq(I)    - pointer to timeout queue                        */
5957 /*              parent(I) - owing object pointer                            */
5958 /*                                                                          */
5959 /* Add a new item to this queue and put it on the very end.                 */
5960 /* We use use ticks to calculate the expiration and mark for when we last   */
5961 /* touched the structure.                                                   */
5962 /* ------------------------------------------------------------------------ */
5963 void
5964 ipf_queueappend(ticks, tqe, ifq, parent)
5965         u_long ticks;
5966         ipftqent_t *tqe;
5967         ipftq_t *ifq;
5968         void *parent;
5969 {
5970
5971         MUTEX_ENTER(&ifq->ifq_lock);
5972         tqe->tqe_parent = parent;
5973         tqe->tqe_pnext = ifq->ifq_tail;
5974         *ifq->ifq_tail = tqe;
5975         ifq->ifq_tail = &tqe->tqe_next;
5976         tqe->tqe_next = NULL;
5977         tqe->tqe_ifq = ifq;
5978         tqe->tqe_die = ticks + ifq->ifq_ttl;
5979         tqe->tqe_touched = ticks;
5980         ifq->ifq_ref++;
5981         MUTEX_EXIT(&ifq->ifq_lock);
5982 }
5983
5984
5985 /* ------------------------------------------------------------------------ */
5986 /* Function:    ipf_movequeue                                               */
5987 /* Returns:     Nil                                                         */
5988 /* Parameters:  tq(I)   - pointer to timeout queue information              */
5989 /*              oifp(I) - old timeout queue entry was on                    */
5990 /*              nifp(I) - new timeout queue to put entry on                 */
5991 /*                                                                          */
5992 /* Move a queue entry from one timeout queue to another timeout queue.      */
5993 /* If it notices that the current entry is already last and does not need   */
5994 /* to move queue, the return.                                               */
5995 /* ------------------------------------------------------------------------ */
5996 void
5997 ipf_movequeue(ticks, tqe, oifq, nifq)
5998         u_long ticks;
5999         ipftqent_t *tqe;
6000         ipftq_t *oifq, *nifq;
6001 {
6002
6003         /*
6004          * If the queue hasn't changed and we last touched this entry at the
6005          * same ipf time, then we're not going to achieve anything by either
6006          * changing the ttl or moving it on the queue.
6007          */
6008         if (oifq == nifq && tqe->tqe_touched == ticks)
6009                 return;
6010
6011         /*
6012          * For any of this to be outside the lock, there is a risk that two
6013          * packets entering simultaneously, with one changing to a different
6014          * queue and one not, could end up with things in a bizarre state.
6015          */
6016         MUTEX_ENTER(&oifq->ifq_lock);
6017
6018         tqe->tqe_touched = ticks;
6019         tqe->tqe_die = ticks + nifq->ifq_ttl;
6020         /*
6021          * Is the operation here going to be a no-op ?
6022          */
6023         if (oifq == nifq) {
6024                 if ((tqe->tqe_next == NULL) ||
6025                     (tqe->tqe_next->tqe_die == tqe->tqe_die)) {
6026                         MUTEX_EXIT(&oifq->ifq_lock);
6027                         return;
6028                 }
6029         }
6030
6031         /*
6032          * Remove from the old queue
6033          */
6034         *tqe->tqe_pnext = tqe->tqe_next;
6035         if (tqe->tqe_next)
6036                 tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
6037         else
6038                 oifq->ifq_tail = tqe->tqe_pnext;
6039         tqe->tqe_next = NULL;
6040
6041         /*
6042          * If we're moving from one queue to another, release the
6043          * lock on the old queue and get a lock on the new queue.
6044          * For user defined queues, if we're moving off it, call
6045          * delete in case it can now be freed.
6046          */
6047         if (oifq != nifq) {
6048                 tqe->tqe_ifq = NULL;
6049
6050                 (void) ipf_deletetimeoutqueue(oifq);
6051
6052                 MUTEX_EXIT(&oifq->ifq_lock);
6053
6054                 MUTEX_ENTER(&nifq->ifq_lock);
6055
6056                 tqe->tqe_ifq = nifq;
6057                 nifq->ifq_ref++;
6058         }
6059
6060         /*
6061          * Add to the bottom of the new queue
6062          */
6063         tqe->tqe_pnext = nifq->ifq_tail;
6064         *nifq->ifq_tail = tqe;
6065         nifq->ifq_tail = &tqe->tqe_next;
6066         MUTEX_EXIT(&nifq->ifq_lock);
6067 }
6068
6069
6070 /* ------------------------------------------------------------------------ */
6071 /* Function:    ipf_updateipid                                              */
6072 /* Returns:     int - 0 == success, -1 == error (packet should be droppped) */
6073 /* Parameters:  fin(I) - pointer to packet information                      */
6074 /*                                                                          */
6075 /* When we are doing NAT, change the IP of every packet to represent a      */
6076 /* single sequence of packets coming from the host, hiding any host         */
6077 /* specific sequencing that might otherwise be revealed.  If the packet is  */
6078 /* a fragment, then store the 'new' IPid in the fragment cache and look up  */
6079 /* the fragment cache for non-leading fragments.  If a non-leading fragment */
6080 /* has no match in the cache, return an error.                              */
6081 /* ------------------------------------------------------------------------ */
6082 static int
6083 ipf_updateipid(fin)
6084         fr_info_t *fin;
6085 {
6086         u_short id, ido, sums;
6087         u_32_t sumd, sum;
6088         ip_t *ip;
6089
6090         if (fin->fin_off != 0) {
6091                 sum = ipf_frag_ipidknown(fin);
6092                 if (sum == 0xffffffff)
6093                         return -1;
6094                 sum &= 0xffff;
6095                 id = (u_short)sum;
6096         } else {
6097                 id = ipf_nextipid(fin);
6098                 if (fin->fin_off == 0 && (fin->fin_flx & FI_FRAG) != 0)
6099                         (void) ipf_frag_ipidnew(fin, (u_32_t)id);
6100         }
6101
6102         ip = fin->fin_ip;
6103         ido = ntohs(ip->ip_id);
6104         if (id == ido)
6105                 return 0;
6106         ip->ip_id = htons(id);
6107         CALC_SUMD(ido, id, sumd);       /* DESTRUCTIVE MACRO! id,ido change */
6108         sum = (~ntohs(ip->ip_sum)) & 0xffff;
6109         sum += sumd;
6110         sum = (sum >> 16) + (sum & 0xffff);
6111         sum = (sum >> 16) + (sum & 0xffff);
6112         sums = ~(u_short)sum;
6113         ip->ip_sum = htons(sums);
6114         return 0;
6115 }
6116
6117
6118 #ifdef  NEED_FRGETIFNAME
6119 /* ------------------------------------------------------------------------ */
6120 /* Function:    ipf_getifname                                               */
6121 /* Returns:     char *    - pointer to interface name                       */
6122 /* Parameters:  ifp(I)    - pointer to network interface                    */
6123 /*              buffer(O) - pointer to where to store interface name        */
6124 /*                                                                          */
6125 /* Constructs an interface name in the buffer passed.  The buffer passed is */
6126 /* expected to be at least LIFNAMSIZ in bytes big.  If buffer is passed in  */
6127 /* as a NULL pointer then return a pointer to a static array.               */
6128 /* ------------------------------------------------------------------------ */
6129 char *
6130 ipf_getifname(ifp, buffer)
6131         struct ifnet *ifp;
6132         char *buffer;
6133 {
6134         static char namebuf[LIFNAMSIZ];
6135 # if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \
6136      defined(__sgi) || defined(linux) || defined(_AIX51) || \
6137      (defined(sun) && !defined(__SVR4) && !defined(__svr4__))
6138         int unit, space;
6139         char temp[20];
6140         char *s;
6141 # endif
6142
6143         if (buffer == NULL)
6144                 buffer = namebuf;
6145         (void) strncpy(buffer, ifp->if_name, LIFNAMSIZ);
6146         buffer[LIFNAMSIZ - 1] = '\0';
6147 # if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \
6148      defined(__sgi) || defined(_AIX51) || \
6149      (defined(sun) && !defined(__SVR4) && !defined(__svr4__))
6150         for (s = buffer; *s; s++)
6151                 ;
6152         unit = ifp->if_unit;
6153         space = LIFNAMSIZ - (s - buffer);
6154         if ((space > 0) && (unit >= 0)) {
6155 #  if defined(SNPRINTF) && defined(_KERNEL)
6156                 SNPRINTF(temp, sizeof(temp), "%d", unit);
6157 #  else
6158                 (void) sprintf(temp, "%d", unit);
6159 #  endif
6160                 (void) strncpy(s, temp, space);
6161         }
6162 # endif
6163         return buffer;
6164 }
6165 #endif
6166
6167
6168 /* ------------------------------------------------------------------------ */
6169 /* Function:    ipf_ioctlswitch                                             */
6170 /* Returns:     int     - -1 continue processing, else ioctl return value   */
6171 /* Parameters:  unit(I) - device unit opened                                */
6172 /*              data(I) - pointer to ioctl data                             */
6173 /*              cmd(I)  - ioctl command                                     */
6174 /*              mode(I) - mode value                                        */
6175 /*              uid(I)  - uid making the ioctl call                         */
6176 /*              ctx(I)  - pointer to context data                           */
6177 /*                                                                          */
6178 /* Based on the value of unit, call the appropriate ioctl handler or return */
6179 /* EIO if ipfilter is not running.   Also checks if write perms are req'd   */
6180 /* for the device in order to execute the ioctl.  A special case is made    */
6181 /* SIOCIPFINTERROR so that the same code isn't required in every handler.   */
6182 /* The context data pointer is passed through as this is used as the key    */
6183 /* for locating a matching token for continued access for walking lists,    */
6184 /* etc.                                                                     */
6185 /* ------------------------------------------------------------------------ */
6186 int
6187 ipf_ioctlswitch(softc, unit, data, cmd, mode, uid, ctx)
6188         ipf_main_softc_t *softc;
6189         int unit, mode, uid;
6190         ioctlcmd_t cmd;
6191         void *data, *ctx;
6192 {
6193         int error = 0;
6194
6195         switch (cmd)
6196         {
6197         case SIOCIPFINTERROR :
6198                 error = BCOPYOUT(&softc->ipf_interror, data,
6199                                  sizeof(softc->ipf_interror));
6200                 if (error != 0) {
6201                         IPFERROR(40);
6202                         error = EFAULT;
6203                 }
6204                 return error;
6205         default :
6206                 break;
6207         }
6208
6209         switch (unit)
6210         {
6211         case IPL_LOGIPF :
6212                 error = ipf_ipf_ioctl(softc, data, cmd, mode, uid, ctx);
6213                 break;
6214         case IPL_LOGNAT :
6215                 if (softc->ipf_running > 0) {
6216                         error = ipf_nat_ioctl(softc, data, cmd, mode,
6217                                               uid, ctx);
6218                 } else {
6219                         IPFERROR(42);
6220                         error = EIO;
6221                 }
6222                 break;
6223         case IPL_LOGSTATE :
6224                 if (softc->ipf_running > 0) {
6225                         error = ipf_state_ioctl(softc, data, cmd, mode,
6226                                                 uid, ctx);
6227                 } else {
6228                         IPFERROR(43);
6229                         error = EIO;
6230                 }
6231                 break;
6232         case IPL_LOGAUTH :
6233                 if (softc->ipf_running > 0) {
6234                         error = ipf_auth_ioctl(softc, data, cmd, mode,
6235                                                uid, ctx);
6236                 } else {
6237                         IPFERROR(44);
6238                         error = EIO;
6239                 }
6240                 break;
6241         case IPL_LOGSYNC :
6242                 if (softc->ipf_running > 0) {
6243                         error = ipf_sync_ioctl(softc, data, cmd, mode,
6244                                                uid, ctx);
6245                 } else {
6246                         error = EIO;
6247                         IPFERROR(45);
6248                 }
6249                 break;
6250         case IPL_LOGSCAN :
6251 #ifdef IPFILTER_SCAN
6252                 if (softc->ipf_running > 0)
6253                         error = ipf_scan_ioctl(softc, data, cmd, mode,
6254                                                uid, ctx);
6255                 else
6256 #endif
6257                 {
6258                         error = EIO;
6259                         IPFERROR(46);
6260                 }
6261                 break;
6262         case IPL_LOGLOOKUP :
6263                 if (softc->ipf_running > 0) {
6264                         error = ipf_lookup_ioctl(softc, data, cmd, mode,
6265                                                  uid, ctx);
6266                 } else {
6267                         error = EIO;
6268                         IPFERROR(47);
6269                 }
6270                 break;
6271         default :
6272                 IPFERROR(48);
6273                 error = EIO;
6274                 break;
6275         }
6276
6277         return error;
6278 }
6279
6280
6281 /*
6282  * This array defines the expected size of objects coming into the kernel
6283  * for the various recognised object types. The first column is flags (see
6284  * below), 2nd column is current size, 3rd column is the version number of
6285  * when the current size became current.
6286  * Flags:
6287  * 1 = minimum size, not absolute size
6288  */
6289 static  int     ipf_objbytes[IPFOBJ_COUNT][3] = {
6290         { 1,    sizeof(struct frentry),         5010000 },      /* 0 */
6291         { 1,    sizeof(struct friostat),        5010000 },
6292         { 0,    sizeof(struct fr_info),         5010000 },
6293         { 0,    sizeof(struct ipf_authstat),    4010100 },
6294         { 0,    sizeof(struct ipfrstat),        5010000 },
6295         { 1,    sizeof(struct ipnat),           5010000 },      /* 5 */
6296         { 0,    sizeof(struct natstat),         5010000 },
6297         { 0,    sizeof(struct ipstate_save),    5010000 },
6298         { 1,    sizeof(struct nat_save),        5010000 },
6299         { 0,    sizeof(struct natlookup),       5010000 },
6300         { 1,    sizeof(struct ipstate),         5010000 },      /* 10 */
6301         { 0,    sizeof(struct ips_stat),        5010000 },
6302         { 0,    sizeof(struct frauth),          5010000 },
6303         { 0,    sizeof(struct ipftune),         4010100 },
6304         { 0,    sizeof(struct nat),             5010000 },
6305         { 0,    sizeof(struct ipfruleiter),     4011400 },      /* 15 */
6306         { 0,    sizeof(struct ipfgeniter),      4011400 },
6307         { 0,    sizeof(struct ipftable),        4011400 },
6308         { 0,    sizeof(struct ipflookupiter),   4011400 },
6309         { 0,    sizeof(struct ipftq) * IPF_TCP_NSTATES },
6310         { 1,    0,                              0       }, /* IPFEXPR */
6311         { 0,    0,                              0       }, /* PROXYCTL */
6312         { 0,    sizeof (struct fripf),          5010000 }
6313 };
6314
6315
6316 /* ------------------------------------------------------------------------ */
6317 /* Function:    ipf_inobj                                                   */
6318 /* Returns:     int     - 0 = success, else failure                         */
6319 /* Parameters:  softc(I) - soft context pointerto work with                 */
6320 /*              data(I)  - pointer to ioctl data                            */
6321 /*              objp(O)  - where to store ipfobj structure                  */
6322 /*              ptr(I)   - pointer to data to copy out                      */
6323 /*              type(I)  - type of structure being moved                    */
6324 /*                                                                          */
6325 /* Copy in the contents of what the ipfobj_t points to.  In future, we      */
6326 /* add things to check for version numbers, sizes, etc, to make it backward */
6327 /* compatible at the ABI for user land.                                     */
6328 /* If objp is not NULL then we assume that the caller wants to see what is  */
6329 /* in the ipfobj_t structure being copied in. As an example, this can tell  */
6330 /* the caller what version of ipfilter the ioctl program was written to.    */
6331 /* ------------------------------------------------------------------------ */
6332 int
6333 ipf_inobj(softc, data, objp, ptr, type)
6334         ipf_main_softc_t *softc;
6335         void *data;
6336         ipfobj_t *objp;
6337         void *ptr;
6338         int type;
6339 {
6340         ipfobj_t obj;
6341         int error;
6342         int size;
6343
6344         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6345                 IPFERROR(49);
6346                 return EINVAL;
6347         }
6348
6349         if (objp == NULL)
6350                 objp = &obj;
6351         error = BCOPYIN(data, objp, sizeof(*objp));
6352         if (error != 0) {
6353                 IPFERROR(124);
6354                 return EFAULT;
6355         }
6356
6357         if (objp->ipfo_type != type) {
6358                 IPFERROR(50);
6359                 return EINVAL;
6360         }
6361
6362         if (objp->ipfo_rev >= ipf_objbytes[type][2]) {
6363                 if ((ipf_objbytes[type][0] & 1) != 0) {
6364                         if (objp->ipfo_size < ipf_objbytes[type][1]) {
6365                                 IPFERROR(51);
6366                                 return EINVAL;
6367                         }
6368                         size =  ipf_objbytes[type][1];
6369                 } else if (objp->ipfo_size == ipf_objbytes[type][1]) {
6370                         size =  objp->ipfo_size;
6371                 } else {
6372                         IPFERROR(52);
6373                         return EINVAL;
6374                 }
6375                 error = COPYIN(objp->ipfo_ptr, ptr, size);
6376                 if (error != 0) {
6377                         IPFERROR(55);
6378                         error = EFAULT;
6379                 }
6380         } else {
6381 #ifdef  IPFILTER_COMPAT
6382                 error = ipf_in_compat(softc, objp, ptr, 0);
6383 #else
6384                 IPFERROR(54);
6385                 error = EINVAL;
6386 #endif
6387         }
6388         return error;
6389 }
6390
6391
6392 /* ------------------------------------------------------------------------ */
6393 /* Function:    ipf_inobjsz                                                 */
6394 /* Returns:     int     - 0 = success, else failure                         */
6395 /* Parameters:  softc(I) - soft context pointerto work with                 */
6396 /*              data(I)  - pointer to ioctl data                            */
6397 /*              ptr(I)   - pointer to store real data in                    */
6398 /*              type(I)  - type of structure being moved                    */
6399 /*              sz(I)    - size of data to copy                             */
6400 /*                                                                          */
6401 /* As per ipf_inobj, except the size of the object to copy in is passed in  */
6402 /* but it must not be smaller than the size defined for the type and the    */
6403 /* type must allow for varied sized objects.  The extra requirement here is */
6404 /* that sz must match the size of the object being passed in - this is not  */
6405 /* not possible nor required in ipf_inobj().                                */
6406 /* ------------------------------------------------------------------------ */
6407 int
6408 ipf_inobjsz(softc, data, ptr, type, sz)
6409         ipf_main_softc_t *softc;
6410         void *data;
6411         void *ptr;
6412         int type, sz;
6413 {
6414         ipfobj_t obj;
6415         int error;
6416
6417         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6418                 IPFERROR(56);
6419                 return EINVAL;
6420         }
6421
6422         error = BCOPYIN(data, &obj, sizeof(obj));
6423         if (error != 0) {
6424                 IPFERROR(125);
6425                 return EFAULT;
6426         }
6427
6428         if (obj.ipfo_type != type) {
6429                 IPFERROR(58);
6430                 return EINVAL;
6431         }
6432
6433         if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6434                 if (((ipf_objbytes[type][0] & 1) == 0) ||
6435                     (sz < ipf_objbytes[type][1])) {
6436                         IPFERROR(57);
6437                         return EINVAL;
6438                 }
6439                 error = COPYIN(obj.ipfo_ptr, ptr, sz);
6440                 if (error != 0) {
6441                         IPFERROR(61);
6442                         error = EFAULT;
6443                 }
6444         } else {
6445 #ifdef  IPFILTER_COMPAT
6446                 error = ipf_in_compat(softc, &obj, ptr, sz);
6447 #else
6448                 IPFERROR(60);
6449                 error = EINVAL;
6450 #endif
6451         }
6452         return error;
6453 }
6454
6455
6456 /* ------------------------------------------------------------------------ */
6457 /* Function:    ipf_outobjsz                                                */
6458 /* Returns:     int     - 0 = success, else failure                         */
6459 /* Parameters:  data(I) - pointer to ioctl data                             */
6460 /*              ptr(I)  - pointer to store real data in                     */
6461 /*              type(I) - type of structure being moved                     */
6462 /*              sz(I)   - size of data to copy                              */
6463 /*                                                                          */
6464 /* As per ipf_outobj, except the size of the object to copy out is passed in*/
6465 /* but it must not be smaller than the size defined for the type and the    */
6466 /* type must allow for varied sized objects.  The extra requirement here is */
6467 /* that sz must match the size of the object being passed in - this is not  */
6468 /* not possible nor required in ipf_outobj().                               */
6469 /* ------------------------------------------------------------------------ */
6470 int
6471 ipf_outobjsz(softc, data, ptr, type, sz)
6472         ipf_main_softc_t *softc;
6473         void *data;
6474         void *ptr;
6475         int type, sz;
6476 {
6477         ipfobj_t obj;
6478         int error;
6479
6480         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6481                 IPFERROR(62);
6482                 return EINVAL;
6483         }
6484
6485         error = BCOPYIN(data, &obj, sizeof(obj));
6486         if (error != 0) {
6487                 IPFERROR(127);
6488                 return EFAULT;
6489         }
6490
6491         if (obj.ipfo_type != type) {
6492                 IPFERROR(63);
6493                 return EINVAL;
6494         }
6495
6496         if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6497                 if (((ipf_objbytes[type][0] & 1) == 0) ||
6498                     (sz < ipf_objbytes[type][1])) {
6499                         IPFERROR(146);
6500                         return EINVAL;
6501                 }
6502                 error = COPYOUT(ptr, obj.ipfo_ptr, sz);
6503                 if (error != 0) {
6504                         IPFERROR(66);
6505                         error = EFAULT;
6506                 }
6507         } else {
6508 #ifdef  IPFILTER_COMPAT
6509                 error = ipf_out_compat(softc, &obj, ptr);
6510 #else
6511                 IPFERROR(65);
6512                 error = EINVAL;
6513 #endif
6514         }
6515         return error;
6516 }
6517
6518
6519 /* ------------------------------------------------------------------------ */
6520 /* Function:    ipf_outobj                                                  */
6521 /* Returns:     int     - 0 = success, else failure                         */
6522 /* Parameters:  data(I) - pointer to ioctl data                             */
6523 /*              ptr(I)  - pointer to store real data in                     */
6524 /*              type(I) - type of structure being moved                     */
6525 /*                                                                          */
6526 /* Copy out the contents of what ptr is to where ipfobj points to.  In      */
6527 /* future, we add things to check for version numbers, sizes, etc, to make  */
6528 /* it backward  compatible at the ABI for user land.                        */
6529 /* ------------------------------------------------------------------------ */
6530 int
6531 ipf_outobj(softc, data, ptr, type)
6532         ipf_main_softc_t *softc;
6533         void *data;
6534         void *ptr;
6535         int type;
6536 {
6537         ipfobj_t obj;
6538         int error;
6539
6540         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6541                 IPFERROR(67);
6542                 return EINVAL;
6543         }
6544
6545         error = BCOPYIN(data, &obj, sizeof(obj));
6546         if (error != 0) {
6547                 IPFERROR(126);
6548                 return EFAULT;
6549         }
6550
6551         if (obj.ipfo_type != type) {
6552                 IPFERROR(68);
6553                 return EINVAL;
6554         }
6555
6556         if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6557                 if ((ipf_objbytes[type][0] & 1) != 0) {
6558                         if (obj.ipfo_size < ipf_objbytes[type][1]) {
6559                                 IPFERROR(69);
6560                                 return EINVAL;
6561                         }
6562                 } else if (obj.ipfo_size != ipf_objbytes[type][1]) {
6563                         IPFERROR(70);
6564                         return EINVAL;
6565                 }
6566
6567                 error = COPYOUT(ptr, obj.ipfo_ptr, obj.ipfo_size);
6568                 if (error != 0) {
6569                         IPFERROR(73);
6570                         error = EFAULT;
6571                 }
6572         } else {
6573 #ifdef  IPFILTER_COMPAT
6574                 error = ipf_out_compat(softc, &obj, ptr);
6575 #else
6576                 IPFERROR(72);
6577                 error = EINVAL;
6578 #endif
6579         }
6580         return error;
6581 }
6582
6583
6584 /* ------------------------------------------------------------------------ */
6585 /* Function:    ipf_outobjk                                                 */
6586 /* Returns:     int     - 0 = success, else failure                         */
6587 /* Parameters:  obj(I)  - pointer to data description structure             */
6588 /*              ptr(I)  - pointer to kernel data to copy out                */
6589 /*                                                                          */
6590 /* In the above functions, the ipfobj_t structure is copied into the kernel,*/
6591 /* telling ipfilter how to copy out data. In this instance, the ipfobj_t is */
6592 /* already populated with information and now we just need to use it.       */
6593 /* There is no need for this function to have a "type" parameter as there   */
6594 /* is no point in validating information that comes from the kernel with    */
6595 /* itself.                                                                  */
6596 /* ------------------------------------------------------------------------ */
6597 int
6598 ipf_outobjk(softc, obj, ptr)
6599         ipf_main_softc_t *softc;
6600         ipfobj_t *obj;
6601         void *ptr;
6602 {
6603         int type = obj->ipfo_type;
6604         int error;
6605
6606         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6607                 IPFERROR(147);
6608                 return EINVAL;
6609         }
6610
6611         if (obj->ipfo_rev >= ipf_objbytes[type][2]) {
6612                 if ((ipf_objbytes[type][0] & 1) != 0) {
6613                         if (obj->ipfo_size < ipf_objbytes[type][1]) {
6614                                 IPFERROR(148);
6615                                 return EINVAL;
6616                         }
6617
6618                 } else if (obj->ipfo_size != ipf_objbytes[type][1]) {
6619                         IPFERROR(149);
6620                         return EINVAL;
6621                 }
6622
6623                 error = COPYOUT(ptr, obj->ipfo_ptr, obj->ipfo_size);
6624                 if (error != 0) {
6625                         IPFERROR(150);
6626                         error = EFAULT;
6627                 }
6628         } else {
6629 #ifdef  IPFILTER_COMPAT
6630                 error = ipf_out_compat(softc, obj, ptr);
6631 #else
6632                 IPFERROR(151);
6633                 error = EINVAL;
6634 #endif
6635         }
6636         return error;
6637 }
6638
6639
6640 /* ------------------------------------------------------------------------ */
6641 /* Function:    ipf_checkl4sum                                              */
6642 /* Returns:     int     - 0 = good, -1 = bad, 1 = cannot check              */
6643 /* Parameters:  fin(I) - pointer to packet information                      */
6644 /*                                                                          */
6645 /* If possible, calculate the layer 4 checksum for the packet.  If this is  */
6646 /* not possible, return without indicating a failure or success but in a    */
6647 /* way that is ditinguishable. This function should only be called by the   */
6648 /* ipf_checkv6sum() for each platform.                                      */
6649 /* ------------------------------------------------------------------------ */
6650 INLINE int
6651 ipf_checkl4sum(fin)
6652         fr_info_t *fin;
6653 {
6654         u_short sum, hdrsum, *csump;
6655         udphdr_t *udp;
6656         int dosum;
6657
6658         /*
6659          * If the TCP packet isn't a fragment, isn't too short and otherwise
6660          * isn't already considered "bad", then validate the checksum.  If
6661          * this check fails then considered the packet to be "bad".
6662          */
6663         if ((fin->fin_flx & (FI_FRAG|FI_SHORT|FI_BAD)) != 0)
6664                 return 1;
6665
6666         csump = NULL;
6667         hdrsum = 0;
6668         dosum = 0;
6669         sum = 0;
6670
6671         switch (fin->fin_p)
6672         {
6673         case IPPROTO_TCP :
6674                 csump = &((tcphdr_t *)fin->fin_dp)->th_sum;
6675                 dosum = 1;
6676                 break;
6677
6678         case IPPROTO_UDP :
6679                 udp = fin->fin_dp;
6680                 if (udp->uh_sum != 0) {
6681                         csump = &udp->uh_sum;
6682                         dosum = 1;
6683                 }
6684                 break;
6685
6686 #ifdef USE_INET6
6687         case IPPROTO_ICMPV6 :
6688                 csump = &((struct icmp6_hdr *)fin->fin_dp)->icmp6_cksum;
6689                 dosum = 1;
6690                 break;
6691 #endif
6692
6693         case IPPROTO_ICMP :
6694                 csump = &((struct icmp *)fin->fin_dp)->icmp_cksum;
6695                 dosum = 1;
6696                 break;
6697
6698         default :
6699                 return 1;
6700                 /*NOTREACHED*/
6701         }
6702
6703         if (csump != NULL)
6704                 hdrsum = *csump;
6705
6706         if (dosum) {
6707                 sum = fr_cksum(fin, fin->fin_ip, fin->fin_p, fin->fin_dp);
6708         }
6709 #if !defined(_KERNEL)
6710         if (sum == hdrsum) {
6711                 FR_DEBUG(("checkl4sum: %hx == %hx\n", sum, hdrsum));
6712         } else {
6713                 FR_DEBUG(("checkl4sum: %hx != %hx\n", sum, hdrsum));
6714         }
6715 #endif
6716         DT2(l4sums, u_short, hdrsum, u_short, sum);
6717         if (hdrsum == sum) {
6718                 fin->fin_cksum = FI_CK_SUMOK;
6719                 return 0;
6720         }
6721         fin->fin_cksum = FI_CK_BAD;
6722         return -1;
6723 }
6724
6725
6726 /* ------------------------------------------------------------------------ */
6727 /* Function:    ipf_ifpfillv4addr                                           */
6728 /* Returns:     int     - 0 = address update, -1 = address not updated      */
6729 /* Parameters:  atype(I)   - type of network address update to perform      */
6730 /*              sin(I)     - pointer to source of address information       */
6731 /*              mask(I)    - pointer to source of netmask information       */
6732 /*              inp(I)     - pointer to destination address store           */
6733 /*              inpmask(I) - pointer to destination netmask store           */
6734 /*                                                                          */
6735 /* Given a type of network address update (atype) to perform, copy          */
6736 /* information from sin/mask into inp/inpmask.  If ipnmask is NULL then no  */
6737 /* netmask update is performed unless FRI_NETMASKED is passed as atype, in  */
6738 /* which case the operation fails.  For all values of atype other than      */
6739 /* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s  */
6740 /* value.                                                                   */
6741 /* ------------------------------------------------------------------------ */
6742 int
6743 ipf_ifpfillv4addr(atype, sin, mask, inp, inpmask)
6744         int atype;
6745         struct sockaddr_in *sin, *mask;
6746         struct in_addr *inp, *inpmask;
6747 {
6748         if (inpmask != NULL && atype != FRI_NETMASKED)
6749                 inpmask->s_addr = 0xffffffff;
6750
6751         if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
6752                 if (atype == FRI_NETMASKED) {
6753                         if (inpmask == NULL)
6754                                 return -1;
6755                         inpmask->s_addr = mask->sin_addr.s_addr;
6756                 }
6757                 inp->s_addr = sin->sin_addr.s_addr & mask->sin_addr.s_addr;
6758         } else {
6759                 inp->s_addr = sin->sin_addr.s_addr;
6760         }
6761         return 0;
6762 }
6763
6764
6765 #ifdef  USE_INET6
6766 /* ------------------------------------------------------------------------ */
6767 /* Function:    ipf_ifpfillv6addr                                           */
6768 /* Returns:     int     - 0 = address update, -1 = address not updated      */
6769 /* Parameters:  atype(I)   - type of network address update to perform      */
6770 /*              sin(I)     - pointer to source of address information       */
6771 /*              mask(I)    - pointer to source of netmask information       */
6772 /*              inp(I)     - pointer to destination address store           */
6773 /*              inpmask(I) - pointer to destination netmask store           */
6774 /*                                                                          */
6775 /* Given a type of network address update (atype) to perform, copy          */
6776 /* information from sin/mask into inp/inpmask.  If ipnmask is NULL then no  */
6777 /* netmask update is performed unless FRI_NETMASKED is passed as atype, in  */
6778 /* which case the operation fails.  For all values of atype other than      */
6779 /* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s  */
6780 /* value.                                                                   */
6781 /* ------------------------------------------------------------------------ */
6782 int
6783 ipf_ifpfillv6addr(atype, sin, mask, inp, inpmask)
6784         int atype;
6785         struct sockaddr_in6 *sin, *mask;
6786         i6addr_t *inp, *inpmask;
6787 {
6788         i6addr_t *src, *and;
6789
6790         src = (i6addr_t *)&sin->sin6_addr;
6791         and = (i6addr_t *)&mask->sin6_addr;
6792
6793         if (inpmask != NULL && atype != FRI_NETMASKED) {
6794                 inpmask->i6[0] = 0xffffffff;
6795                 inpmask->i6[1] = 0xffffffff;
6796                 inpmask->i6[2] = 0xffffffff;
6797                 inpmask->i6[3] = 0xffffffff;
6798         }
6799
6800         if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
6801                 if (atype == FRI_NETMASKED) {
6802                         if (inpmask == NULL)
6803                                 return -1;
6804                         inpmask->i6[0] = and->i6[0];
6805                         inpmask->i6[1] = and->i6[1];
6806                         inpmask->i6[2] = and->i6[2];
6807                         inpmask->i6[3] = and->i6[3];
6808                 }
6809
6810                 inp->i6[0] = src->i6[0] & and->i6[0];
6811                 inp->i6[1] = src->i6[1] & and->i6[1];
6812                 inp->i6[2] = src->i6[2] & and->i6[2];
6813                 inp->i6[3] = src->i6[3] & and->i6[3];
6814         } else {
6815                 inp->i6[0] = src->i6[0];
6816                 inp->i6[1] = src->i6[1];
6817                 inp->i6[2] = src->i6[2];
6818                 inp->i6[3] = src->i6[3];
6819         }
6820         return 0;
6821 }
6822 #endif
6823
6824
6825 /* ------------------------------------------------------------------------ */
6826 /* Function:    ipf_matchtag                                                */
6827 /* Returns:     0 == mismatch, 1 == match.                                  */
6828 /* Parameters:  tag1(I) - pointer to first tag to compare                   */
6829 /*              tag2(I) - pointer to second tag to compare                  */
6830 /*                                                                          */
6831 /* Returns true (non-zero) or false(0) if the two tag structures can be     */
6832 /* considered to be a match or not match, respectively.  The tag is 16      */
6833 /* bytes long (16 characters) but that is overlayed with 4 32bit ints so    */
6834 /* compare the ints instead, for speed. tag1 is the master of the           */
6835 /* comparison.  This function should only be called with both tag1 and tag2 */
6836 /* as non-NULL pointers.                                                    */
6837 /* ------------------------------------------------------------------------ */
6838 int
6839 ipf_matchtag(tag1, tag2)
6840         ipftag_t *tag1, *tag2;
6841 {
6842         if (tag1 == tag2)
6843                 return 1;
6844
6845         if ((tag1->ipt_num[0] == 0) && (tag2->ipt_num[0] == 0))
6846                 return 1;
6847
6848         if ((tag1->ipt_num[0] == tag2->ipt_num[0]) &&
6849             (tag1->ipt_num[1] == tag2->ipt_num[1]) &&
6850             (tag1->ipt_num[2] == tag2->ipt_num[2]) &&
6851             (tag1->ipt_num[3] == tag2->ipt_num[3]))
6852                 return 1;
6853         return 0;
6854 }
6855
6856
6857 /* ------------------------------------------------------------------------ */
6858 /* Function:    ipf_coalesce                                                */
6859 /* Returns:     1 == success, -1 == failure, 0 == no change                 */
6860 /* Parameters:  fin(I) - pointer to packet information                      */
6861 /*                                                                          */
6862 /* Attempt to get all of the packet data into a single, contiguous buffer.  */
6863 /* If this call returns a failure then the buffers have also been freed.    */
6864 /* ------------------------------------------------------------------------ */
6865 int
6866 ipf_coalesce(fin)
6867         fr_info_t *fin;
6868 {
6869
6870         if ((fin->fin_flx & FI_COALESCE) != 0)
6871                 return 1;
6872
6873         /*
6874          * If the mbuf pointers indicate that there is no mbuf to work with,
6875          * return but do not indicate success or failure.
6876          */
6877         if (fin->fin_m == NULL || fin->fin_mp == NULL)
6878                 return 0;
6879
6880 #if defined(_KERNEL)
6881         if (ipf_pullup(fin->fin_m, fin, fin->fin_plen) == NULL) {
6882                 ipf_main_softc_t *softc = fin->fin_main_soft;
6883
6884                 DT1(frb_coalesce, fr_info_t *, fin);
6885                 LBUMP(ipf_stats[fin->fin_out].fr_badcoalesces);
6886 # ifdef MENTAT
6887                 FREE_MB_T(*fin->fin_mp);
6888 # endif
6889                 fin->fin_reason = FRB_COALESCE;
6890                 *fin->fin_mp = NULL;
6891                 fin->fin_m = NULL;
6892                 return -1;
6893         }
6894 #else
6895         fin = fin;      /* LINT */
6896 #endif
6897         return 1;
6898 }
6899
6900
6901 /*
6902  * The following table lists all of the tunable variables that can be
6903  * accessed via SIOCIPFGET/SIOCIPFSET/SIOCIPFGETNEXt.  The format of each row
6904  * in the table below is as follows:
6905  *
6906  * pointer to value, name of value, minimum, maximum, size of the value's
6907  *     container, value attribute flags
6908  *
6909  * For convienience, IPFT_RDONLY means the value is read-only, IPFT_WRDISABLED
6910  * means the value can only be written to when IPFilter is loaded but disabled.
6911  * The obvious implication is if neither of these are set then the value can be
6912  * changed at any time without harm.
6913  */
6914
6915
6916 /* ------------------------------------------------------------------------ */
6917 /* Function:    ipf_tune_findbycookie                                       */
6918 /* Returns:     NULL = search failed, else pointer to tune struct           */
6919 /* Parameters:  cookie(I) - cookie value to search for amongst tuneables    */
6920 /*              next(O)   - pointer to place to store the cookie for the    */
6921 /*                          "next" tuneable, if it is desired.              */
6922 /*                                                                          */
6923 /* This function is used to walk through all of the existing tunables with  */
6924 /* successive calls.  It searches the known tunables for the one which has  */
6925 /* a matching value for "cookie" - ie its address.  When returning a match, */
6926 /* the next one to be found may be returned inside next.                    */
6927 /* ------------------------------------------------------------------------ */
6928 static ipftuneable_t *
6929 ipf_tune_findbycookie(ptop, cookie, next)
6930         ipftuneable_t **ptop;
6931         void *cookie, **next;
6932 {
6933         ipftuneable_t *ta, **tap;
6934
6935         for (ta = *ptop; ta->ipft_name != NULL; ta++)
6936                 if (ta == cookie) {
6937                         if (next != NULL) {
6938                                 /*
6939                                  * If the next entry in the array has a name
6940                                  * present, then return a pointer to it for
6941                                  * where to go next, else return a pointer to
6942                                  * the dynaminc list as a key to search there
6943                                  * next.  This facilitates a weak linking of
6944                                  * the two "lists" together.
6945                                  */
6946                                 if ((ta + 1)->ipft_name != NULL)
6947                                         *next = ta + 1;
6948                                 else
6949                                         *next = ptop;
6950                         }
6951                         return ta;
6952                 }
6953
6954         for (tap = ptop; (ta = *tap) != NULL; tap = &ta->ipft_next)
6955                 if (tap == cookie) {
6956                         if (next != NULL)
6957                                 *next = &ta->ipft_next;
6958                         return ta;
6959                 }
6960
6961         if (next != NULL)
6962                 *next = NULL;
6963         return NULL;
6964 }
6965
6966
6967 /* ------------------------------------------------------------------------ */
6968 /* Function:    ipf_tune_findbyname                                         */
6969 /* Returns:     NULL = search failed, else pointer to tune struct           */
6970 /* Parameters:  name(I) - name of the tuneable entry to find.               */
6971 /*                                                                          */
6972 /* Search the static array of tuneables and the list of dynamic tuneables   */
6973 /* for an entry with a matching name.  If we can find one, return a pointer */
6974 /* to the matching structure.                                               */
6975 /* ------------------------------------------------------------------------ */
6976 static ipftuneable_t *
6977 ipf_tune_findbyname(top, name)
6978         ipftuneable_t *top;
6979         const char *name;
6980 {
6981         ipftuneable_t *ta;
6982
6983         for (ta = top; ta != NULL; ta = ta->ipft_next)
6984                 if (!strcmp(ta->ipft_name, name)) {
6985                         return ta;
6986                 }
6987
6988         return NULL;
6989 }
6990
6991
6992 /* ------------------------------------------------------------------------ */
6993 /* Function:    ipf_tune_add_array                                          */
6994 /* Returns:     int - 0 == success, else failure                            */
6995 /* Parameters:  newtune - pointer to new tune array to add to tuneables     */
6996 /*                                                                          */
6997 /* Appends tune structures from the array passed in (newtune) to the end of */
6998 /* the current list of "dynamic" tuneable parameters.                       */
6999 /* If any entry to be added is already present (by name) then the operation */
7000 /* is aborted - entries that have been added are removed before returning.  */
7001 /* An entry with no name (NULL) is used as the indication that the end of   */
7002 /* the array has been reached.                                              */
7003 /* ------------------------------------------------------------------------ */
7004 int
7005 ipf_tune_add_array(softc, newtune)
7006         ipf_main_softc_t *softc;
7007         ipftuneable_t *newtune;
7008 {
7009         ipftuneable_t *nt, *dt;
7010         int error = 0;
7011
7012         for (nt = newtune; nt->ipft_name != NULL; nt++) {
7013                 error = ipf_tune_add(softc, nt);
7014                 if (error != 0) {
7015                         for (dt = newtune; dt != nt; dt++) {
7016                                 (void) ipf_tune_del(softc, dt);
7017                         }
7018                 }
7019         }
7020
7021         return error;
7022 }
7023
7024
7025 /* ------------------------------------------------------------------------ */
7026 /* Function:    ipf_tune_array_link                                         */
7027 /* Returns:     0 == success, -1 == failure                                 */
7028 /* Parameters:  softc(I) - soft context pointerto work with                 */
7029 /*              array(I) - pointer to an array of tuneables                 */
7030 /*                                                                          */
7031 /* Given an array of tunables (array), append them to the current list of   */
7032 /* tuneables for this context (softc->ipf_tuners.) To properly prepare the  */
7033 /* the array for being appended to the list, initialise all of the next     */
7034 /* pointers so we don't need to walk parts of it with ++ and others with    */
7035 /* next. The array is expected to have an entry with a NULL name as the     */
7036 /* terminator. Trying to add an array with no non-NULL names will return as */
7037 /* a failure.                                                               */
7038 /* ------------------------------------------------------------------------ */
7039 int
7040 ipf_tune_array_link(softc, array)
7041         ipf_main_softc_t *softc;
7042         ipftuneable_t *array;
7043 {
7044         ipftuneable_t *t, **p;
7045
7046         t = array;
7047         if (t->ipft_name == NULL)
7048                 return -1;
7049
7050         for (; t[1].ipft_name != NULL; t++)
7051                 t[0].ipft_next = &t[1];
7052         t->ipft_next = NULL;
7053
7054         /*
7055          * Since a pointer to the last entry isn't kept, we need to find it
7056          * each time we want to add new variables to the list.
7057          */
7058         for (p = &softc->ipf_tuners; (t = *p) != NULL; p = &t->ipft_next)
7059                 if (t->ipft_name == NULL)
7060                         break;
7061         *p = array;
7062
7063         return 0;
7064 }
7065
7066
7067 /* ------------------------------------------------------------------------ */
7068 /* Function:    ipf_tune_array_unlink                                       */
7069 /* Returns:     0 == success, -1 == failure                                 */
7070 /* Parameters:  softc(I) - soft context pointerto work with                 */
7071 /*              array(I) - pointer to an array of tuneables                 */
7072 /*                                                                          */
7073 /* ------------------------------------------------------------------------ */
7074 int
7075 ipf_tune_array_unlink(softc, array)
7076         ipf_main_softc_t *softc;
7077         ipftuneable_t *array;
7078 {
7079         ipftuneable_t *t, **p;
7080
7081         for (p = &softc->ipf_tuners; (t = *p) != NULL; p = &t->ipft_next)
7082                 if (t == array)
7083                         break;
7084         if (t == NULL)
7085                 return -1;
7086
7087         for (; t[1].ipft_name != NULL; t++)
7088                 ;
7089
7090         *p = t->ipft_next;
7091
7092         return 0;
7093 }
7094
7095
7096 /* ------------------------------------------------------------------------ */
7097 /* Function:   ipf_tune_array_copy                                          */
7098 /* Returns:    NULL = failure, else pointer to new array                    */
7099 /* Parameters: base(I)     - pointer to structure base                      */
7100 /*             size(I)     - size of the array at template                  */
7101 /*             template(I) - original array to copy                         */
7102 /*                                                                          */
7103 /* Allocate memory for a new set of tuneable values and copy everything     */
7104 /* from template into the new region of memory.  The new region is full of  */
7105 /* uninitialised pointers (ipft_next) so set them up.  Now, ipftp_offset... */
7106 /*                                                                          */
7107 /* NOTE: the following assumes that sizeof(long) == sizeof(void *)          */
7108 /* In the array template, ipftp_offset is the offset (in bytes) of the      */
7109 /* location of the tuneable value inside the structure pointed to by base.  */
7110 /* As ipftp_offset is a union over the pointers to the tuneable values, if  */
7111 /* we add base to the copy's ipftp_offset, copy ends up with a pointer in   */
7112 /* ipftp_void that points to the stored value.                              */
7113 /* ------------------------------------------------------------------------ */
7114 ipftuneable_t *
7115 ipf_tune_array_copy(base, size, template)
7116         void *base;
7117         size_t size;
7118         ipftuneable_t *template;
7119 {
7120         ipftuneable_t *copy;
7121         int i;
7122
7123
7124         KMALLOCS(copy, ipftuneable_t *, size);
7125         if (copy == NULL) {
7126                 return NULL;
7127         }
7128         bcopy(template, copy, size);
7129
7130         for (i = 0; copy[i].ipft_name; i++) {
7131                 copy[i].ipft_una.ipftp_offset += (u_long)base;
7132                 copy[i].ipft_next = copy + i + 1;
7133         }
7134
7135         return copy;
7136 }
7137
7138
7139 /* ------------------------------------------------------------------------ */
7140 /* Function:    ipf_tune_add                                                */
7141 /* Returns:     int - 0 == success, else failure                            */
7142 /* Parameters:  newtune - pointer to new tune entry to add to tuneables     */
7143 /*                                                                          */
7144 /* Appends tune structures from the array passed in (newtune) to the end of */
7145 /* the current list of "dynamic" tuneable parameters.  Once added, the      */
7146 /* owner of the object is not expected to ever change "ipft_next".          */
7147 /* ------------------------------------------------------------------------ */
7148 int
7149 ipf_tune_add(softc, newtune)
7150         ipf_main_softc_t *softc;
7151         ipftuneable_t *newtune;
7152 {
7153         ipftuneable_t *ta, **tap;
7154
7155         ta = ipf_tune_findbyname(softc->ipf_tuners, newtune->ipft_name);
7156         if (ta != NULL) {
7157                 IPFERROR(74);
7158                 return EEXIST;
7159         }
7160
7161         for (tap = &softc->ipf_tuners; *tap != NULL; tap = &(*tap)->ipft_next)
7162                 ;
7163
7164         newtune->ipft_next = NULL;
7165         *tap = newtune;
7166         return 0;
7167 }
7168
7169
7170 /* ------------------------------------------------------------------------ */
7171 /* Function:    ipf_tune_del                                                */
7172 /* Returns:     int - 0 == success, else failure                            */
7173 /* Parameters:  oldtune - pointer to tune entry to remove from the list of  */
7174 /*                        current dynamic tuneables                         */
7175 /*                                                                          */
7176 /* Search for the tune structure, by pointer, in the list of those that are */
7177 /* dynamically added at run time.  If found, adjust the list so that this   */
7178 /* structure is no longer part of it.                                       */
7179 /* ------------------------------------------------------------------------ */
7180 int
7181 ipf_tune_del(softc, oldtune)
7182         ipf_main_softc_t *softc;
7183         ipftuneable_t *oldtune;
7184 {
7185         ipftuneable_t *ta, **tap;
7186         int error = 0;
7187
7188         for (tap = &softc->ipf_tuners; (ta = *tap) != NULL;
7189              tap = &ta->ipft_next) {
7190                 if (ta == oldtune) {
7191                         *tap = oldtune->ipft_next;
7192                         oldtune->ipft_next = NULL;
7193                         break;
7194                 }
7195         }
7196
7197         if (ta == NULL) {
7198                 error = ESRCH;
7199                 IPFERROR(75);
7200         }
7201         return error;
7202 }
7203
7204
7205 /* ------------------------------------------------------------------------ */
7206 /* Function:    ipf_tune_del_array                                          */
7207 /* Returns:     int - 0 == success, else failure                            */
7208 /* Parameters:  oldtune - pointer to tuneables array                        */
7209 /*                                                                          */
7210 /* Remove each tuneable entry in the array from the list of "dynamic"       */
7211 /* tunables.  If one entry should fail to be found, an error will be        */
7212 /* returned and no further ones removed.                                    */
7213 /* An entry with a NULL name is used as the indicator of the last entry in  */
7214 /* the array.                                                               */
7215 /* ------------------------------------------------------------------------ */
7216 int
7217 ipf_tune_del_array(softc, oldtune)
7218         ipf_main_softc_t *softc;
7219         ipftuneable_t *oldtune;
7220 {
7221         ipftuneable_t *ot;
7222         int error = 0;
7223
7224         for (ot = oldtune; ot->ipft_name != NULL; ot++) {
7225                 error = ipf_tune_del(softc, ot);
7226                 if (error != 0)
7227                         break;
7228         }
7229
7230         return error;
7231
7232 }
7233
7234
7235 /* ------------------------------------------------------------------------ */
7236 /* Function:    ipf_tune                                                    */
7237 /* Returns:     int - 0 == success, else failure                            */
7238 /* Parameters:  cmd(I)  - ioctl command number                              */
7239 /*              data(I) - pointer to ioctl data structure                   */
7240 /*                                                                          */
7241 /* Implement handling of SIOCIPFGETNEXT, SIOCIPFGET and SIOCIPFSET.  These  */
7242 /* three ioctls provide the means to access and control global variables    */
7243 /* within IPFilter, allowing (for example) timeouts and table sizes to be   */
7244 /* changed without rebooting, reloading or recompiling.  The initialisation */
7245 /* and 'destruction' routines of the various components of ipfilter are all */
7246 /* each responsible for handling their own values being too big.            */
7247 /* ------------------------------------------------------------------------ */
7248 int
7249 ipf_ipftune(softc, cmd, data)
7250         ipf_main_softc_t *softc;
7251         ioctlcmd_t cmd;
7252         void *data;
7253 {
7254         ipftuneable_t *ta;
7255         ipftune_t tu;
7256         void *cookie;
7257         int error;
7258
7259         error = ipf_inobj(softc, data, NULL, &tu, IPFOBJ_TUNEABLE);
7260         if (error != 0)
7261                 return error;
7262
7263         tu.ipft_name[sizeof(tu.ipft_name) - 1] = '\0';
7264         cookie = tu.ipft_cookie;
7265         ta = NULL;
7266
7267         switch (cmd)
7268         {
7269         case SIOCIPFGETNEXT :
7270                 /*
7271                  * If cookie is non-NULL, assume it to be a pointer to the last
7272                  * entry we looked at, so find it (if possible) and return a
7273                  * pointer to the next one after it.  The last entry in the
7274                  * the table is a NULL entry, so when we get to it, set cookie
7275                  * to NULL and return that, indicating end of list, erstwhile
7276                  * if we come in with cookie set to NULL, we are starting anew
7277                  * at the front of the list.
7278                  */
7279                 if (cookie != NULL) {
7280                         ta = ipf_tune_findbycookie(&softc->ipf_tuners,
7281                                                    cookie, &tu.ipft_cookie);
7282                 } else {
7283                         ta = softc->ipf_tuners;
7284                         tu.ipft_cookie = ta + 1;
7285                 }
7286                 if (ta != NULL) {
7287                         /*
7288                          * Entry found, but does the data pointed to by that
7289                          * row fit in what we can return?
7290                          */
7291                         if (ta->ipft_sz > sizeof(tu.ipft_un)) {
7292                                 IPFERROR(76);
7293                                 return EINVAL;
7294                         }
7295
7296                         tu.ipft_vlong = 0;
7297                         if (ta->ipft_sz == sizeof(u_long))
7298                                 tu.ipft_vlong = *ta->ipft_plong;
7299                         else if (ta->ipft_sz == sizeof(u_int))
7300                                 tu.ipft_vint = *ta->ipft_pint;
7301                         else if (ta->ipft_sz == sizeof(u_short))
7302                                 tu.ipft_vshort = *ta->ipft_pshort;
7303                         else if (ta->ipft_sz == sizeof(u_char))
7304                                 tu.ipft_vchar = *ta->ipft_pchar;
7305
7306                         tu.ipft_sz = ta->ipft_sz;
7307                         tu.ipft_min = ta->ipft_min;
7308                         tu.ipft_max = ta->ipft_max;
7309                         tu.ipft_flags = ta->ipft_flags;
7310                         bcopy(ta->ipft_name, tu.ipft_name,
7311                               MIN(sizeof(tu.ipft_name),
7312                                   strlen(ta->ipft_name) + 1));
7313                 }
7314                 error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7315                 break;
7316
7317         case SIOCIPFGET :
7318         case SIOCIPFSET :
7319                 /*
7320                  * Search by name or by cookie value for a particular entry
7321                  * in the tuning paramter table.
7322                  */
7323                 IPFERROR(77);
7324                 error = ESRCH;
7325                 if (cookie != NULL) {
7326                         ta = ipf_tune_findbycookie(&softc->ipf_tuners,
7327                                                    cookie, NULL);
7328                         if (ta != NULL)
7329                                 error = 0;
7330                 } else if (tu.ipft_name[0] != '\0') {
7331                         ta = ipf_tune_findbyname(softc->ipf_tuners,
7332                                                  tu.ipft_name);
7333                         if (ta != NULL)
7334                                 error = 0;
7335                 }
7336                 if (error != 0)
7337                         break;
7338
7339                 if (cmd == (ioctlcmd_t)SIOCIPFGET) {
7340                         /*
7341                          * Fetch the tuning parameters for a particular value
7342                          */
7343                         tu.ipft_vlong = 0;
7344                         if (ta->ipft_sz == sizeof(u_long))
7345                                 tu.ipft_vlong = *ta->ipft_plong;
7346                         else if (ta->ipft_sz == sizeof(u_int))
7347                                 tu.ipft_vint = *ta->ipft_pint;
7348                         else if (ta->ipft_sz == sizeof(u_short))
7349                                 tu.ipft_vshort = *ta->ipft_pshort;
7350                         else if (ta->ipft_sz == sizeof(u_char))
7351                                 tu.ipft_vchar = *ta->ipft_pchar;
7352                         tu.ipft_cookie = ta;
7353                         tu.ipft_sz = ta->ipft_sz;
7354                         tu.ipft_min = ta->ipft_min;
7355                         tu.ipft_max = ta->ipft_max;
7356                         tu.ipft_flags = ta->ipft_flags;
7357                         error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7358
7359                 } else if (cmd == (ioctlcmd_t)SIOCIPFSET) {
7360                         /*
7361                          * Set an internal parameter.  The hard part here is
7362                          * getting the new value safely and correctly out of
7363                          * the kernel (given we only know its size, not type.)
7364                          */
7365                         u_long in;
7366
7367                         if (((ta->ipft_flags & IPFT_WRDISABLED) != 0) &&
7368                             (softc->ipf_running > 0)) {
7369                                 IPFERROR(78);
7370                                 error = EBUSY;
7371                                 break;
7372                         }
7373
7374                         in = tu.ipft_vlong;
7375                         if (in < ta->ipft_min || in > ta->ipft_max) {
7376                                 IPFERROR(79);
7377                                 error = EINVAL;
7378                                 break;
7379                         }
7380
7381                         if (ta->ipft_func != NULL) {
7382                                 SPL_INT(s);
7383
7384                                 SPL_NET(s);
7385                                 error = (*ta->ipft_func)(softc, ta,
7386                                                          &tu.ipft_un);
7387                                 SPL_X(s);
7388
7389                         } else if (ta->ipft_sz == sizeof(u_long)) {
7390                                 tu.ipft_vlong = *ta->ipft_plong;
7391                                 *ta->ipft_plong = in;
7392
7393                         } else if (ta->ipft_sz == sizeof(u_int)) {
7394                                 tu.ipft_vint = *ta->ipft_pint;
7395                                 *ta->ipft_pint = (u_int)(in & 0xffffffff);
7396
7397                         } else if (ta->ipft_sz == sizeof(u_short)) {
7398                                 tu.ipft_vshort = *ta->ipft_pshort;
7399                                 *ta->ipft_pshort = (u_short)(in & 0xffff);
7400
7401                         } else if (ta->ipft_sz == sizeof(u_char)) {
7402                                 tu.ipft_vchar = *ta->ipft_pchar;
7403                                 *ta->ipft_pchar = (u_char)(in & 0xff);
7404                         }
7405                         error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7406                 }
7407                 break;
7408
7409         default :
7410                 IPFERROR(80);
7411                 error = EINVAL;
7412                 break;
7413         }
7414
7415         return error;
7416 }
7417
7418
7419 /* ------------------------------------------------------------------------ */
7420 /* Function:    ipf_zerostats                                               */
7421 /* Returns:     int - 0 = success, else failure                             */
7422 /* Parameters:  data(O) - pointer to pointer for copying data back to       */
7423 /*                                                                          */
7424 /* Copies the current statistics out to userspace and then zero's the       */
7425 /* current ones in the kernel. The lock is only held across the bzero() as  */
7426 /* the copyout may result in paging (ie network activity.)                  */
7427 /* ------------------------------------------------------------------------ */
7428 int
7429 ipf_zerostats(softc, data)
7430         ipf_main_softc_t *softc;
7431         caddr_t data;
7432 {
7433         friostat_t fio;
7434         ipfobj_t obj;
7435         int error;
7436
7437         error = ipf_inobj(softc, data, &obj, &fio, IPFOBJ_IPFSTAT);
7438         if (error != 0)
7439                 return error;
7440         ipf_getstat(softc, &fio, obj.ipfo_rev);
7441         error = ipf_outobj(softc, data, &fio, IPFOBJ_IPFSTAT);
7442         if (error != 0)
7443                 return error;
7444
7445         WRITE_ENTER(&softc->ipf_mutex);
7446         bzero(&softc->ipf_stats, sizeof(softc->ipf_stats));
7447         RWLOCK_EXIT(&softc->ipf_mutex);
7448
7449         return 0;
7450 }
7451
7452
7453 /* ------------------------------------------------------------------------ */
7454 /* Function:    ipf_resolvedest                                             */
7455 /* Returns:     Nil                                                         */
7456 /* Parameters:  softc(I) - pointer to soft context main structure           */
7457 /*              base(I)  - where strings are stored                         */
7458 /*              fdp(IO)  - pointer to destination information to resolve    */
7459 /*              v(I)     - IP protocol version to match                     */
7460 /*                                                                          */
7461 /* Looks up an interface name in the frdest structure pointed to by fdp and */
7462 /* if a matching name can be found for the particular IP protocol version   */
7463 /* then store the interface pointer in the frdest struct.  If no match is   */
7464 /* found, then set the interface pointer to be -1 as NULL is considered to  */
7465 /* indicate there is no information at all in the structure.                */
7466 /* ------------------------------------------------------------------------ */
7467 int
7468 ipf_resolvedest(softc, base, fdp, v)
7469         ipf_main_softc_t *softc;
7470         char *base;
7471         frdest_t *fdp;
7472         int v;
7473 {
7474         int errval = 0;
7475         void *ifp;
7476
7477         ifp = NULL;
7478
7479         if (fdp->fd_name != -1) {
7480                 if (fdp->fd_type == FRD_DSTLIST) {
7481                         ifp = ipf_lookup_res_name(softc, IPL_LOGIPF,
7482                                                   IPLT_DSTLIST,
7483                                                   base + fdp->fd_name,
7484                                                   NULL);
7485                         if (ifp == NULL) {
7486                                 IPFERROR(144);
7487                                 errval = ESRCH;
7488                         }
7489                 } else {
7490                         ifp = GETIFP(base + fdp->fd_name, v);
7491                         if (ifp == NULL)
7492                                 ifp = (void *)-1;
7493                 }
7494         }
7495         fdp->fd_ptr = ifp;
7496
7497         if ((ifp != NULL) && (ifp != (void *)-1)) {
7498                 fdp->fd_local = ipf_deliverlocal(softc, v, ifp, &fdp->fd_ip6);
7499         }
7500
7501         return errval;
7502 }
7503
7504
7505 /* ------------------------------------------------------------------------ */
7506 /* Function:    ipf_resolvenic                                              */
7507 /* Returns:     void* - NULL = wildcard name, -1 = failed to find NIC, else */
7508 /*                      pointer to interface structure for NIC              */
7509 /* Parameters:  softc(I)- pointer to soft context main structure            */
7510 /*              name(I) - complete interface name                           */
7511 /*              v(I)    - IP protocol version                               */
7512 /*                                                                          */
7513 /* Look for a network interface structure that firstly has a matching name  */
7514 /* to that passed in and that is also being used for that IP protocol       */
7515 /* version (necessary on some platforms where there are separate listings   */
7516 /* for both IPv4 and IPv6 on the same physical NIC.                         */
7517 /* ------------------------------------------------------------------------ */
7518 void *
7519 ipf_resolvenic(softc, name, v)
7520         ipf_main_softc_t *softc;
7521         char *name;
7522         int v;
7523 {
7524         void *nic;
7525
7526         softc = softc;  /* gcc -Wextra */
7527         if (name[0] == '\0')
7528                 return NULL;
7529
7530         if ((name[1] == '\0') && ((name[0] == '-') || (name[0] == '*'))) {
7531                 return NULL;
7532         }
7533
7534         nic = GETIFP(name, v);
7535         if (nic == NULL)
7536                 nic = (void *)-1;
7537         return nic;
7538 }
7539
7540
7541 /* ------------------------------------------------------------------------ */
7542 /* Function:    ipf_token_expire                                            */
7543 /* Returns:     None.                                                       */
7544 /* Parameters:  softc(I) - pointer to soft context main structure           */
7545 /*                                                                          */
7546 /* This function is run every ipf tick to see if there are any tokens that  */
7547 /* have been held for too long and need to be freed up.                     */
7548 /* ------------------------------------------------------------------------ */
7549 void
7550 ipf_token_expire(softc)
7551         ipf_main_softc_t *softc;
7552 {
7553         ipftoken_t *it;
7554
7555         WRITE_ENTER(&softc->ipf_tokens);
7556         while ((it = softc->ipf_token_head) != NULL) {
7557                 if (it->ipt_die > softc->ipf_ticks)
7558                         break;
7559
7560                 ipf_token_deref(softc, it);
7561         }
7562         RWLOCK_EXIT(&softc->ipf_tokens);
7563 }
7564
7565
7566 /* ------------------------------------------------------------------------ */
7567 /* Function:    ipf_token_flush                                             */
7568 /* Returns:     None.                                                       */
7569 /* Parameters:  softc(I) - pointer to soft context main structure           */
7570 /*                                                                          */
7571 /* Loop through all of the existing tokens and call deref to see if they    */
7572 /* can be freed. Normally a function like this might just loop on           */
7573 /* ipf_token_head but there is a chance that a token might have a ref count */
7574 /* of greater than one and in that case the the reference would drop twice  */
7575 /* by code that is only entitled to drop it once.                           */
7576 /* ------------------------------------------------------------------------ */
7577 static void
7578 ipf_token_flush(softc)
7579         ipf_main_softc_t *softc;
7580 {
7581         ipftoken_t *it, *next;
7582
7583         WRITE_ENTER(&softc->ipf_tokens);
7584         for (it = softc->ipf_token_head; it != NULL; it = next) {
7585                 next = it->ipt_next;
7586                 (void) ipf_token_deref(softc, it);
7587         }
7588         RWLOCK_EXIT(&softc->ipf_tokens);
7589 }
7590
7591
7592 /* ------------------------------------------------------------------------ */
7593 /* Function:    ipf_token_del                                               */
7594 /* Returns:     int     - 0 = success, else error                           */
7595 /* Parameters:  softc(I)- pointer to soft context main structure            */
7596 /*              type(I) - the token type to match                           */
7597 /*              uid(I)  - uid owning the token                              */
7598 /*              ptr(I)  - context pointer for the token                     */
7599 /*                                                                          */
7600 /* This function looks for a a token in the current list that matches up    */
7601 /* the fields (type, uid, ptr).  If none is found, ESRCH is returned, else  */
7602 /* call ipf_token_dewref() to remove it from the list. In the event that    */
7603 /* the token has a reference held elsewhere, setting ipt_complete to 2      */
7604 /* enables debugging to distinguish between the two paths that ultimately   */
7605 /* lead to a token to be deleted.                                           */
7606 /* ------------------------------------------------------------------------ */
7607 int
7608 ipf_token_del(softc, type, uid, ptr)
7609         ipf_main_softc_t *softc;
7610         int type, uid;
7611         void *ptr;
7612 {
7613         ipftoken_t *it;
7614         int error;
7615
7616         IPFERROR(82);
7617         error = ESRCH;
7618
7619         WRITE_ENTER(&softc->ipf_tokens);
7620         for (it = softc->ipf_token_head; it != NULL; it = it->ipt_next) {
7621                 if (ptr == it->ipt_ctx && type == it->ipt_type &&
7622                     uid == it->ipt_uid) {
7623                         it->ipt_complete = 2;
7624                         ipf_token_deref(softc, it);
7625                         error = 0;
7626                         break;
7627                 }
7628         }
7629         RWLOCK_EXIT(&softc->ipf_tokens);
7630
7631         return error;
7632 }
7633
7634
7635 /* ------------------------------------------------------------------------ */
7636 /* Function:    ipf_token_mark_complete                                     */
7637 /* Returns:     None.                                                       */
7638 /* Parameters:  token(I) - pointer to token structure                       */
7639 /*                                                                          */
7640 /* Mark a token as being ineligable for being found with ipf_token_find.    */
7641 /* ------------------------------------------------------------------------ */
7642 void
7643 ipf_token_mark_complete(token)
7644         ipftoken_t *token;
7645 {
7646         if (token->ipt_complete == 0)
7647                 token->ipt_complete = 1;
7648 }
7649
7650
7651 /* ------------------------------------------------------------------------ */
7652 /* Function:    ipf_token_find                                               */
7653 /* Returns:     ipftoken_t * - NULL if no memory, else pointer to token     */
7654 /* Parameters:  softc(I)- pointer to soft context main structure            */
7655 /*              type(I) - the token type to match                           */
7656 /*              uid(I)  - uid owning the token                              */
7657 /*              ptr(I)  - context pointer for the token                     */
7658 /*                                                                          */
7659 /* This function looks for a live token in the list of current tokens that  */
7660 /* matches the tuple (type, uid, ptr).  If one cannot be found then one is  */
7661 /* allocated.  If one is found then it is moved to the top of the list of   */
7662 /* currently active tokens.                                                 */
7663 /* ------------------------------------------------------------------------ */
7664 ipftoken_t *
7665 ipf_token_find(softc, type, uid, ptr)
7666         ipf_main_softc_t *softc;
7667         int type, uid;
7668         void *ptr;
7669 {
7670         ipftoken_t *it, *new;
7671
7672         KMALLOC(new, ipftoken_t *);
7673         if (new != NULL)
7674                 bzero((char *)new, sizeof(*new));
7675
7676         WRITE_ENTER(&softc->ipf_tokens);
7677         for (it = softc->ipf_token_head; it != NULL; it = it->ipt_next) {
7678                 if ((ptr == it->ipt_ctx) && (type == it->ipt_type) &&
7679                     (uid == it->ipt_uid) && (it->ipt_complete < 2))
7680                         break;
7681         }
7682
7683         if (it == NULL) {
7684                 it = new;
7685                 new = NULL;
7686                 if (it == NULL) {
7687                         RWLOCK_EXIT(&softc->ipf_tokens);
7688                         return NULL;
7689                 }
7690                 it->ipt_ctx = ptr;
7691                 it->ipt_uid = uid;
7692                 it->ipt_type = type;
7693                 it->ipt_ref = 1;
7694         } else {
7695                 if (new != NULL) {
7696                         KFREE(new);
7697                         new = NULL;
7698                 }
7699
7700                 if (it->ipt_complete > 0)
7701                         it = NULL;
7702                 else
7703                         ipf_token_unlink(softc, it);
7704         }
7705
7706         if (it != NULL) {
7707                 it->ipt_pnext = softc->ipf_token_tail;
7708                 *softc->ipf_token_tail = it;
7709                 softc->ipf_token_tail = &it->ipt_next;
7710                 it->ipt_next = NULL;
7711                 it->ipt_ref++;
7712
7713                 it->ipt_die = softc->ipf_ticks + 20;
7714         }
7715
7716         RWLOCK_EXIT(&softc->ipf_tokens);
7717
7718         return it;
7719 }
7720
7721
7722 /* ------------------------------------------------------------------------ */
7723 /* Function:    ipf_token_unlink                                            */
7724 /* Returns:     None.                                                       */
7725 /* Parameters:  softc(I) - pointer to soft context main structure           */
7726 /*              token(I) - pointer to token structure                       */
7727 /* Write Locks: ipf_tokens                                                  */
7728 /*                                                                          */
7729 /* This function unlinks a token structure from the linked list of tokens   */
7730 /* that "own" it.  The head pointer never needs to be explicitly adjusted   */
7731 /* but the tail does due to the linked list implementation.                 */
7732 /* ------------------------------------------------------------------------ */
7733 static void
7734 ipf_token_unlink(softc, token)
7735         ipf_main_softc_t *softc;
7736         ipftoken_t *token;
7737 {
7738
7739         if (softc->ipf_token_tail == &token->ipt_next)
7740                 softc->ipf_token_tail = token->ipt_pnext;
7741
7742         *token->ipt_pnext = token->ipt_next;
7743         if (token->ipt_next != NULL)
7744                 token->ipt_next->ipt_pnext = token->ipt_pnext;
7745         token->ipt_next = NULL;
7746         token->ipt_pnext = NULL;
7747 }
7748
7749
7750 /* ------------------------------------------------------------------------ */
7751 /* Function:    ipf_token_deref                                             */
7752 /* Returns:     int      - 0 == token freed, else reference count           */
7753 /* Parameters:  softc(I) - pointer to soft context main structure           */
7754 /*              token(I) - pointer to token structure                       */
7755 /* Write Locks: ipf_tokens                                                  */
7756 /*                                                                          */
7757 /* Drop the reference count on the token structure and if it drops to zero, */
7758 /* call the dereference function for the token type because it is then      */
7759 /* possible to free the token data structure.                               */
7760 /* ------------------------------------------------------------------------ */
7761 int
7762 ipf_token_deref(softc, token)
7763         ipf_main_softc_t *softc;
7764         ipftoken_t *token;
7765 {
7766         void *data, **datap;
7767
7768         ASSERT(token->ipt_ref > 0);
7769         token->ipt_ref--;
7770         if (token->ipt_ref > 0)
7771                 return token->ipt_ref;
7772
7773         data = token->ipt_data;
7774         datap = &data;
7775
7776         if ((data != NULL) && (data != (void *)-1)) {
7777                 switch (token->ipt_type)
7778                 {
7779                 case IPFGENITER_IPF :
7780                         (void) ipf_derefrule(softc, (frentry_t **)datap);
7781                         break;
7782                 case IPFGENITER_IPNAT :
7783                         WRITE_ENTER(&softc->ipf_nat);
7784                         ipf_nat_rule_deref(softc, (ipnat_t **)datap);
7785                         RWLOCK_EXIT(&softc->ipf_nat);
7786                         break;
7787                 case IPFGENITER_NAT :
7788                         ipf_nat_deref(softc, (nat_t **)datap);
7789                         break;
7790                 case IPFGENITER_STATE :
7791                         ipf_state_deref(softc, (ipstate_t **)datap);
7792                         break;
7793                 case IPFGENITER_FRAG :
7794                         ipf_frag_pkt_deref(softc, (ipfr_t **)datap);
7795                         break;
7796                 case IPFGENITER_NATFRAG :
7797                         ipf_frag_nat_deref(softc, (ipfr_t **)datap);
7798                         break;
7799                 case IPFGENITER_HOSTMAP :
7800                         WRITE_ENTER(&softc->ipf_nat);
7801                         ipf_nat_hostmapdel(softc, (hostmap_t **)datap);
7802                         RWLOCK_EXIT(&softc->ipf_nat);
7803                         break;
7804                 default :
7805                         ipf_lookup_iterderef(softc, token->ipt_type, data);
7806                         break;
7807                 }
7808         }
7809
7810         ipf_token_unlink(softc, token);
7811         KFREE(token);
7812         return 0;
7813 }
7814
7815
7816 /* ------------------------------------------------------------------------ */
7817 /* Function:    ipf_nextrule                                                */
7818 /* Returns:     frentry_t * - NULL == no more rules, else pointer to next   */
7819 /* Parameters:  softc(I)    - pointer to soft context main structure        */
7820 /*              fr(I)       - pointer to filter rule                        */
7821 /*              out(I)      - 1 == out rules, 0 == input rules              */
7822 /*                                                                          */
7823 /* Starting with "fr", find the next rule to visit. This includes visiting  */
7824 /* the list of rule groups if either fr is NULL (empty list) or it is the   */
7825 /* last rule in the list. When walking rule lists, it is either input or    */
7826 /* output rules that are returned, never both.                              */
7827 /* ------------------------------------------------------------------------ */
7828 static frentry_t *
7829 ipf_nextrule(softc, active, unit, fr, out)
7830         ipf_main_softc_t *softc;
7831         int active, unit;
7832         frentry_t *fr;
7833         int out;
7834 {
7835         frentry_t *next;
7836         frgroup_t *fg;
7837
7838         if (fr != NULL && fr->fr_group != -1) {
7839                 fg = ipf_findgroup(softc, fr->fr_names + fr->fr_group,
7840                                    unit, active, NULL);
7841                 if (fg != NULL)
7842                         fg = fg->fg_next;
7843         } else {
7844                 fg = softc->ipf_groups[unit][active];
7845         }
7846
7847         while (fg != NULL) {
7848                 next = fg->fg_start;
7849                 while (next != NULL) {
7850                         if (out) {
7851                                 if (next->fr_flags & FR_OUTQUE)
7852                                         return next;
7853                         } else if (next->fr_flags & FR_INQUE) {
7854                                 return next;
7855                         }
7856                         next = next->fr_next;
7857                 }
7858                 if (next == NULL)
7859                         fg = fg->fg_next;
7860         }
7861
7862         return NULL;
7863 }
7864
7865 /* ------------------------------------------------------------------------ */
7866 /* Function:    ipf_getnextrule                                             */
7867 /* Returns:     int - 0 = success, else error                               */
7868 /* Parameters:  softc(I)- pointer to soft context main structure            */
7869 /*              t(I)   - pointer to destination information to resolve      */
7870 /*              ptr(I) - pointer to ipfobj_t to copyin from user space      */
7871 /*                                                                          */
7872 /* This function's first job is to bring in the ipfruleiter_t structure via */
7873 /* the ipfobj_t structure to determine what should be the next rule to      */
7874 /* return. Once the ipfruleiter_t has been brought in, it then tries to     */
7875 /* find the 'next rule'.  This may include searching rule group lists or    */
7876 /* just be as simple as looking at the 'next' field in the rule structure.  */
7877 /* When we have found the rule to return, increase its reference count and  */
7878 /* if we used an existing rule to get here, decrease its reference count.   */
7879 /* ------------------------------------------------------------------------ */
7880 int
7881 ipf_getnextrule(softc, t, ptr)
7882         ipf_main_softc_t *softc;
7883         ipftoken_t *t;
7884         void *ptr;
7885 {
7886         frentry_t *fr, *next, zero;
7887         ipfruleiter_t it;
7888         int error, out;
7889         frgroup_t *fg;
7890         ipfobj_t obj;
7891         int predict;
7892         char *dst;
7893         int unit;
7894
7895         if (t == NULL || ptr == NULL) {
7896                 IPFERROR(84);
7897                 return EFAULT;
7898         }
7899
7900         error = ipf_inobj(softc, ptr, &obj, &it, IPFOBJ_IPFITER);
7901         if (error != 0)
7902                 return error;
7903
7904         if ((it.iri_inout < 0) || (it.iri_inout > 3)) {
7905                 IPFERROR(85);
7906                 return EINVAL;
7907         }
7908         if ((it.iri_active != 0) && (it.iri_active != 1)) {
7909                 IPFERROR(86);
7910                 return EINVAL;
7911         }
7912         if (it.iri_nrules == 0) {
7913                 IPFERROR(87);
7914                 return ENOSPC;
7915         }
7916         if (it.iri_rule == NULL) {
7917                 IPFERROR(88);
7918                 return EFAULT;
7919         }
7920
7921         fg = NULL;
7922         fr = t->ipt_data;
7923         if ((it.iri_inout & F_OUT) != 0)
7924                 out = 1;
7925         else
7926                 out = 0;
7927         if ((it.iri_inout & F_ACIN) != 0)
7928                 unit = IPL_LOGCOUNT;
7929         else
7930                 unit = IPL_LOGIPF;
7931
7932         READ_ENTER(&softc->ipf_mutex);
7933         if (fr == NULL) {
7934                 if (*it.iri_group == '\0') {
7935                         if (unit == IPL_LOGCOUNT) {
7936                                 next = softc->ipf_acct[out][it.iri_active];
7937                         } else {
7938                                 next = softc->ipf_rules[out][it.iri_active];
7939                         }
7940                         if (next == NULL)
7941                                 next = ipf_nextrule(softc, it.iri_active,
7942                                                     unit, NULL, out);
7943                 } else {
7944                         fg = ipf_findgroup(softc, it.iri_group, unit,
7945                                            it.iri_active, NULL);
7946                         if (fg != NULL)
7947                                 next = fg->fg_start;
7948                         else
7949                                 next = NULL;
7950                 }
7951         } else {
7952                 next = fr->fr_next;
7953                 if (next == NULL)
7954                         next = ipf_nextrule(softc, it.iri_active, unit,
7955                                             fr, out);
7956         }
7957
7958         if (next != NULL && next->fr_next != NULL)
7959                 predict = 1;
7960         else if (ipf_nextrule(softc, it.iri_active, unit, next, out) != NULL)
7961                 predict = 1;
7962         else
7963                 predict = 0;
7964
7965         if (fr != NULL)
7966                 (void) ipf_derefrule(softc, &fr);
7967
7968         obj.ipfo_type = IPFOBJ_FRENTRY;
7969         dst = (char *)it.iri_rule;
7970
7971         if (next != NULL) {
7972                 obj.ipfo_size = next->fr_size;
7973                 MUTEX_ENTER(&next->fr_lock);
7974                 next->fr_ref++;
7975                 MUTEX_EXIT(&next->fr_lock);
7976                 t->ipt_data = next;
7977         } else {
7978                 obj.ipfo_size = sizeof(frentry_t);
7979                 bzero(&zero, sizeof(zero));
7980                 next = &zero;
7981                 t->ipt_data = NULL;
7982         }
7983         it.iri_rule = predict ? next : NULL;
7984         if (predict == 0)
7985                 ipf_token_mark_complete(t);
7986
7987         RWLOCK_EXIT(&softc->ipf_mutex);
7988
7989         obj.ipfo_ptr = dst;
7990         error = ipf_outobjk(softc, &obj, next);
7991         if (error == 0 && t->ipt_data != NULL) {
7992                 dst += obj.ipfo_size;
7993                 if (next->fr_data != NULL) {
7994                         ipfobj_t dobj;
7995
7996                         if (next->fr_type == FR_T_IPFEXPR)
7997                                 dobj.ipfo_type = IPFOBJ_IPFEXPR;
7998                         else
7999                                 dobj.ipfo_type = IPFOBJ_FRIPF;
8000                         dobj.ipfo_size = next->fr_dsize;
8001                         dobj.ipfo_rev = obj.ipfo_rev;
8002                         dobj.ipfo_ptr = dst;
8003                         error = ipf_outobjk(softc, &dobj, next->fr_data);
8004                 }
8005         }
8006
8007         if ((fr != NULL) && (next == &zero))
8008                 (void) ipf_derefrule(softc, &fr);
8009
8010         return error;
8011 }
8012
8013
8014 /* ------------------------------------------------------------------------ */
8015 /* Function:    ipf_frruleiter                                              */
8016 /* Returns:     int - 0 = success, else error                               */
8017 /* Parameters:  softc(I)- pointer to soft context main structure            */
8018 /*              data(I) - the token type to match                           */
8019 /*              uid(I)  - uid owning the token                              */
8020 /*              ptr(I)  - context pointer for the token                     */
8021 /*                                                                          */
8022 /* This function serves as a stepping stone between ipf_ipf_ioctl and       */
8023 /* ipf_getnextrule.  It's role is to find the right token in the kernel for */
8024 /* the process doing the ioctl and use that to ask for the next rule.       */
8025 /* ------------------------------------------------------------------------ */
8026 static int
8027 ipf_frruleiter(softc, data, uid, ctx)
8028         ipf_main_softc_t *softc;
8029         void *data, *ctx;
8030         int uid;
8031 {
8032         ipftoken_t *token;
8033         ipfruleiter_t it;
8034         ipfobj_t obj;
8035         int error;
8036
8037         token = ipf_token_find(softc, IPFGENITER_IPF, uid, ctx);
8038         if (token != NULL) {
8039                 error = ipf_getnextrule(softc, token, data);
8040                 WRITE_ENTER(&softc->ipf_tokens);
8041                 ipf_token_deref(softc, token);
8042                 RWLOCK_EXIT(&softc->ipf_tokens);
8043         } else {
8044                 error = ipf_inobj(softc, data, &obj, &it, IPFOBJ_IPFITER);
8045                 if (error != 0)
8046                         return error;
8047                 it.iri_rule = NULL;
8048                 error = ipf_outobj(softc, data, &it, IPFOBJ_IPFITER);
8049         }
8050
8051         return error;
8052 }
8053
8054
8055 /* ------------------------------------------------------------------------ */
8056 /* Function:    ipf_geniter                                                 */
8057 /* Returns:     int - 0 = success, else error                               */
8058 /* Parameters:  softc(I) - pointer to soft context main structure           */
8059 /*              token(I) - pointer to ipftoken_t structure                  */
8060 /*              itp(I)   - pointer to iterator data                         */
8061 /*                                                                          */
8062 /* Decide which iterator function to call using information passed through  */
8063 /* the ipfgeniter_t structure at itp.                                       */
8064 /* ------------------------------------------------------------------------ */
8065 static int
8066 ipf_geniter(softc, token, itp)
8067         ipf_main_softc_t *softc;
8068         ipftoken_t *token;
8069         ipfgeniter_t *itp;
8070 {
8071         int error;
8072
8073         switch (itp->igi_type)
8074         {
8075         case IPFGENITER_FRAG :
8076                 error = ipf_frag_pkt_next(softc, token, itp);
8077                 break;
8078         default :
8079                 IPFERROR(92);
8080                 error = EINVAL;
8081                 break;
8082         }
8083
8084         return error;
8085 }
8086
8087
8088 /* ------------------------------------------------------------------------ */
8089 /* Function:    ipf_genericiter                                             */
8090 /* Returns:     int - 0 = success, else error                               */
8091 /* Parameters:  softc(I)- pointer to soft context main structure            */
8092 /*              data(I) - the token type to match                           */
8093 /*              uid(I)  - uid owning the token                              */
8094 /*              ptr(I)  - context pointer for the token                     */
8095 /*                                                                          */
8096 /* Handle the SIOCGENITER ioctl for the ipfilter device. The primary role   */
8097 /* ------------------------------------------------------------------------ */
8098 int
8099 ipf_genericiter(softc, data, uid, ctx)
8100         ipf_main_softc_t *softc;
8101         void *data, *ctx;
8102         int uid;
8103 {
8104         ipftoken_t *token;
8105         ipfgeniter_t iter;
8106         int error;
8107
8108         error = ipf_inobj(softc, data, NULL, &iter, IPFOBJ_GENITER);
8109         if (error != 0)
8110                 return error;
8111
8112         token = ipf_token_find(softc, iter.igi_type, uid, ctx);
8113         if (token != NULL) {
8114                 token->ipt_subtype = iter.igi_type;
8115                 error = ipf_geniter(softc, token, &iter);
8116                 WRITE_ENTER(&softc->ipf_tokens);
8117                 ipf_token_deref(softc, token);
8118                 RWLOCK_EXIT(&softc->ipf_tokens);
8119         } else {
8120                 IPFERROR(93);
8121                 error = 0;
8122         }
8123
8124         return error;
8125 }
8126
8127
8128 /* ------------------------------------------------------------------------ */
8129 /* Function:    ipf_ipf_ioctl                                               */
8130 /* Returns:     int - 0 = success, else error                               */
8131 /* Parameters:  softc(I)- pointer to soft context main structure           */
8132 /*              data(I) - the token type to match                           */
8133 /*              cmd(I)  - the ioctl command number                          */
8134 /*              mode(I) - mode flags for the ioctl                          */
8135 /*              uid(I)  - uid owning the token                              */
8136 /*              ptr(I)  - context pointer for the token                     */
8137 /*                                                                          */
8138 /* This function handles all of the ioctl command that are actually isssued */
8139 /* to the /dev/ipl device.                                                  */
8140 /* ------------------------------------------------------------------------ */
8141 int
8142 ipf_ipf_ioctl(softc, data, cmd, mode, uid, ctx)
8143         ipf_main_softc_t *softc;
8144         caddr_t data;
8145         ioctlcmd_t cmd;
8146         int mode, uid;
8147         void *ctx;
8148 {
8149         friostat_t fio;
8150         int error, tmp;
8151         ipfobj_t obj;
8152         SPL_INT(s);
8153
8154         switch (cmd)
8155         {
8156         case SIOCFRENB :
8157                 if (!(mode & FWRITE)) {
8158                         IPFERROR(94);
8159                         error = EPERM;
8160                 } else {
8161                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8162                         if (error != 0) {
8163                                 IPFERROR(95);
8164                                 error = EFAULT;
8165                                 break;
8166                         }
8167
8168                         WRITE_ENTER(&softc->ipf_global);
8169                         if (tmp) {
8170                                 if (softc->ipf_running > 0)
8171                                         error = 0;
8172                                 else
8173                                         error = ipfattach(softc);
8174                                 if (error == 0)
8175                                         softc->ipf_running = 1;
8176                                 else
8177                                         (void) ipfdetach(softc);
8178                         } else {
8179                                 if (softc->ipf_running == 1)
8180                                         error = ipfdetach(softc);
8181                                 else
8182                                         error = 0;
8183                                 if (error == 0)
8184                                         softc->ipf_running = -1;
8185                         }
8186                         RWLOCK_EXIT(&softc->ipf_global);
8187                 }
8188                 break;
8189
8190         case SIOCIPFSET :
8191                 if (!(mode & FWRITE)) {
8192                         IPFERROR(96);
8193                         error = EPERM;
8194                         break;
8195                 }
8196                 /* FALLTHRU */
8197         case SIOCIPFGETNEXT :
8198         case SIOCIPFGET :
8199                 error = ipf_ipftune(softc, cmd, (void *)data);
8200                 break;
8201
8202         case SIOCSETFF :
8203                 if (!(mode & FWRITE)) {
8204                         IPFERROR(97);
8205                         error = EPERM;
8206                 } else {
8207                         error = BCOPYIN(data, &softc->ipf_flags,
8208                                         sizeof(softc->ipf_flags));
8209                         if (error != 0) {
8210                                 IPFERROR(98);
8211                                 error = EFAULT;
8212                         }
8213                 }
8214                 break;
8215
8216         case SIOCGETFF :
8217                 error = BCOPYOUT(&softc->ipf_flags, data,
8218                                  sizeof(softc->ipf_flags));
8219                 if (error != 0) {
8220                         IPFERROR(99);
8221                         error = EFAULT;
8222                 }
8223                 break;
8224
8225         case SIOCFUNCL :
8226                 error = ipf_resolvefunc(softc, (void *)data);
8227                 break;
8228
8229         case SIOCINAFR :
8230         case SIOCRMAFR :
8231         case SIOCADAFR :
8232         case SIOCZRLST :
8233                 if (!(mode & FWRITE)) {
8234                         IPFERROR(100);
8235                         error = EPERM;
8236                 } else {
8237                         error = frrequest(softc, IPL_LOGIPF, cmd, (caddr_t)data,
8238                                           softc->ipf_active, 1);
8239                 }
8240                 break;
8241
8242         case SIOCINIFR :
8243         case SIOCRMIFR :
8244         case SIOCADIFR :
8245                 if (!(mode & FWRITE)) {
8246                         IPFERROR(101);
8247                         error = EPERM;
8248                 } else {
8249                         error = frrequest(softc, IPL_LOGIPF, cmd, (caddr_t)data,
8250                                           1 - softc->ipf_active, 1);
8251                 }
8252                 break;
8253
8254         case SIOCSWAPA :
8255                 if (!(mode & FWRITE)) {
8256                         IPFERROR(102);
8257                         error = EPERM;
8258                 } else {
8259                         WRITE_ENTER(&softc->ipf_mutex);
8260                         error = BCOPYOUT(&softc->ipf_active, data,
8261                                          sizeof(softc->ipf_active));
8262                         if (error != 0) {
8263                                 IPFERROR(103);
8264                                 error = EFAULT;
8265                         } else {
8266                                 softc->ipf_active = 1 - softc->ipf_active;
8267                         }
8268                         RWLOCK_EXIT(&softc->ipf_mutex);
8269                 }
8270                 break;
8271
8272         case SIOCGETFS :
8273                 error = ipf_inobj(softc, (void *)data, &obj, &fio,
8274                                   IPFOBJ_IPFSTAT);
8275                 if (error != 0)
8276                         break;
8277                 ipf_getstat(softc, &fio, obj.ipfo_rev);
8278                 error = ipf_outobj(softc, (void *)data, &fio, IPFOBJ_IPFSTAT);
8279                 break;
8280
8281         case SIOCFRZST :
8282                 if (!(mode & FWRITE)) {
8283                         IPFERROR(104);
8284                         error = EPERM;
8285                 } else
8286                         error = ipf_zerostats(softc, (caddr_t)data);
8287                 break;
8288
8289         case SIOCIPFFL :
8290                 if (!(mode & FWRITE)) {
8291                         IPFERROR(105);
8292                         error = EPERM;
8293                 } else {
8294                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8295                         if (!error) {
8296                                 tmp = ipf_flush(softc, IPL_LOGIPF, tmp);
8297                                 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8298                                 if (error != 0) {
8299                                         IPFERROR(106);
8300                                         error = EFAULT;
8301                                 }
8302                         } else {
8303                                 IPFERROR(107);
8304                                 error = EFAULT;
8305                         }
8306                 }
8307                 break;
8308
8309 #ifdef USE_INET6
8310         case SIOCIPFL6 :
8311                 if (!(mode & FWRITE)) {
8312                         IPFERROR(108);
8313                         error = EPERM;
8314                 } else {
8315                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8316                         if (!error) {
8317                                 tmp = ipf_flush(softc, IPL_LOGIPF, tmp);
8318                                 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8319                                 if (error != 0) {
8320                                         IPFERROR(109);
8321                                         error = EFAULT;
8322                                 }
8323                         } else {
8324                                 IPFERROR(110);
8325                                 error = EFAULT;
8326                         }
8327                 }
8328                 break;
8329 #endif
8330
8331         case SIOCSTLCK :
8332                 if (!(mode & FWRITE)) {
8333                         IPFERROR(122);
8334                         error = EPERM;
8335                 } else {
8336                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8337                         if (error == 0) {
8338                                 ipf_state_setlock(softc->ipf_state_soft, tmp);
8339                                 ipf_nat_setlock(softc->ipf_nat_soft, tmp);
8340                                 ipf_frag_setlock(softc->ipf_frag_soft, tmp);
8341                                 ipf_auth_setlock(softc->ipf_auth_soft, tmp);
8342                         } else {
8343                                 IPFERROR(111);
8344                                 error = EFAULT;
8345                         }
8346                 }
8347                 break;
8348
8349 #ifdef  IPFILTER_LOG
8350         case SIOCIPFFB :
8351                 if (!(mode & FWRITE)) {
8352                         IPFERROR(112);
8353                         error = EPERM;
8354                 } else {
8355                         tmp = ipf_log_clear(softc, IPL_LOGIPF);
8356                         error = BCOPYOUT(&tmp, data, sizeof(tmp));
8357                         if (error) {
8358                                 IPFERROR(113);
8359                                 error = EFAULT;
8360                         }
8361                 }
8362                 break;
8363 #endif /* IPFILTER_LOG */
8364
8365         case SIOCFRSYN :
8366                 if (!(mode & FWRITE)) {
8367                         IPFERROR(114);
8368                         error = EPERM;
8369                 } else {
8370                         WRITE_ENTER(&softc->ipf_global);
8371 #if (defined(MENTAT) && defined(_KERNEL)) && !defined(INSTANCES)
8372                         error = ipfsync();
8373 #else
8374                         ipf_sync(softc, NULL);
8375                         error = 0;
8376 #endif
8377                         RWLOCK_EXIT(&softc->ipf_global);
8378
8379                 }
8380                 break;
8381
8382         case SIOCGFRST :
8383                 error = ipf_outobj(softc, (void *)data,
8384                                    ipf_frag_stats(softc->ipf_frag_soft),
8385                                    IPFOBJ_FRAGSTAT);
8386                 break;
8387
8388 #ifdef  IPFILTER_LOG
8389         case FIONREAD :
8390                 tmp = ipf_log_bytesused(softc, IPL_LOGIPF);
8391                 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8392                 break;
8393 #endif
8394
8395         case SIOCIPFITER :
8396                 SPL_SCHED(s);
8397                 error = ipf_frruleiter(softc, data, uid, ctx);
8398                 SPL_X(s);
8399                 break;
8400
8401         case SIOCGENITER :
8402                 SPL_SCHED(s);
8403                 error = ipf_genericiter(softc, data, uid, ctx);
8404                 SPL_X(s);
8405                 break;
8406
8407         case SIOCIPFDELTOK :
8408                 error = BCOPYIN(data, &tmp, sizeof(tmp));
8409                 if (error == 0) {
8410                         SPL_SCHED(s);
8411                         error = ipf_token_del(softc, tmp, uid, ctx);
8412                         SPL_X(s);
8413                 }
8414                 break;
8415
8416         default :
8417                 IPFERROR(115);
8418                 error = EINVAL;
8419                 break;
8420         }
8421
8422         return error;
8423 }
8424
8425
8426 /* ------------------------------------------------------------------------ */
8427 /* Function:    ipf_decaps                                                  */
8428 /* Returns:     int        - -1 == decapsulation failed, else bit mask of   */
8429 /*                           flags indicating packet filtering decision.    */
8430 /* Parameters:  fin(I)     - pointer to packet information                  */
8431 /*              pass(I)    - IP protocol version to match                   */
8432 /*              l5proto(I) - layer 5 protocol to decode UDP data as.        */
8433 /*                                                                          */
8434 /* This function is called for packets that are wrapt up in other packets,  */
8435 /* for example, an IP packet that is the entire data segment for another IP */
8436 /* packet.  If the basic constraints for this are satisfied, change the     */
8437 /* buffer to point to the start of the inner packet and start processing    */
8438 /* rules belonging to the head group this rule specifies.                   */
8439 /* ------------------------------------------------------------------------ */
8440 u_32_t
8441 ipf_decaps(fin, pass, l5proto)
8442         fr_info_t *fin;
8443         u_32_t pass;
8444         int l5proto;
8445 {
8446         fr_info_t fin2, *fino = NULL;
8447         int elen, hlen, nh;
8448         grehdr_t gre;
8449         ip_t *ip;
8450         mb_t *m;
8451
8452         if ((fin->fin_flx & FI_COALESCE) == 0)
8453                 if (ipf_coalesce(fin) == -1)
8454                         goto cantdecaps;
8455
8456         m = fin->fin_m;
8457         hlen = fin->fin_hlen;
8458
8459         switch (fin->fin_p)
8460         {
8461         case IPPROTO_UDP :
8462                 /*
8463                  * In this case, the specific protocol being decapsulated
8464                  * inside UDP frames comes from the rule.
8465                  */
8466                 nh = fin->fin_fr->fr_icode;
8467                 break;
8468
8469         case IPPROTO_GRE :      /* 47 */
8470                 bcopy(fin->fin_dp, (char *)&gre, sizeof(gre));
8471                 hlen += sizeof(grehdr_t);
8472                 if (gre.gr_R|gre.gr_s)
8473                         goto cantdecaps;
8474                 if (gre.gr_C)
8475                         hlen += 4;
8476                 if (gre.gr_K)
8477                         hlen += 4;
8478                 if (gre.gr_S)
8479                         hlen += 4;
8480
8481                 nh = IPPROTO_IP;
8482
8483                 /*
8484                  * If the routing options flag is set, validate that it is
8485                  * there and bounce over it.
8486                  */
8487 #if 0
8488                 /* This is really heavy weight and lots of room for error, */
8489                 /* so for now, put it off and get the simple stuff right.  */
8490                 if (gre.gr_R) {
8491                         u_char off, len, *s;
8492                         u_short af;
8493                         int end;
8494
8495                         end = 0;
8496                         s = fin->fin_dp;
8497                         s += hlen;
8498                         aplen = fin->fin_plen - hlen;
8499                         while (aplen > 3) {
8500                                 af = (s[0] << 8) | s[1];
8501                                 off = s[2];
8502                                 len = s[3];
8503                                 aplen -= 4;
8504                                 s += 4;
8505                                 if (af == 0 && len == 0) {
8506                                         end = 1;
8507                                         break;
8508                                 }
8509                                 if (aplen < len)
8510                                         break;
8511                                 s += len;
8512                                 aplen -= len;
8513                         }
8514                         if (end != 1)
8515                                 goto cantdecaps;
8516                         hlen = s - (u_char *)fin->fin_dp;
8517                 }
8518 #endif
8519                 break;
8520
8521 #ifdef IPPROTO_IPIP
8522         case IPPROTO_IPIP :     /* 4 */
8523 #endif
8524                 nh = IPPROTO_IP;
8525                 break;
8526
8527         default :       /* Includes ESP, AH is special for IPv4 */
8528                 goto cantdecaps;
8529         }
8530
8531         switch (nh)
8532         {
8533         case IPPROTO_IP :
8534         case IPPROTO_IPV6 :
8535                 break;
8536         default :
8537                 goto cantdecaps;
8538         }
8539
8540         bcopy((char *)fin, (char *)&fin2, sizeof(fin2));
8541         fino = fin;
8542         fin = &fin2;
8543         elen = hlen;
8544 #if defined(MENTAT) && defined(_KERNEL)
8545         m->b_rptr += elen;
8546 #else
8547         m->m_data += elen;
8548         m->m_len -= elen;
8549 #endif
8550         fin->fin_plen -= elen;
8551
8552         ip = (ip_t *)((char *)fin->fin_ip + elen);
8553
8554         /*
8555          * Make sure we have at least enough data for the network layer
8556          * header.
8557          */
8558         if (IP_V(ip) == 4)
8559                 hlen = IP_HL(ip) << 2;
8560 #ifdef USE_INET6
8561         else if (IP_V(ip) == 6)
8562                 hlen = sizeof(ip6_t);
8563 #endif
8564         else
8565                 goto cantdecaps2;
8566
8567         if (fin->fin_plen < hlen)
8568                 goto cantdecaps2;
8569
8570         fin->fin_dp = (char *)ip + hlen;
8571
8572         if (IP_V(ip) == 4) {
8573                 /*
8574                  * Perform IPv4 header checksum validation.
8575                  */
8576                 if (ipf_cksum((u_short *)ip, hlen))
8577                         goto cantdecaps2;
8578         }
8579
8580         if (ipf_makefrip(hlen, ip, fin) == -1) {
8581 cantdecaps2:
8582                 if (m != NULL) {
8583 #if defined(MENTAT) && defined(_KERNEL)
8584                         m->b_rptr -= elen;
8585 #else
8586                         m->m_data -= elen;
8587                         m->m_len += elen;
8588 #endif
8589                 }
8590 cantdecaps:
8591                 DT1(frb_decapfrip, fr_info_t *, fin);
8592                 pass &= ~FR_CMDMASK;
8593                 pass |= FR_BLOCK|FR_QUICK;
8594                 fin->fin_reason = FRB_DECAPFRIP;
8595                 return -1;
8596         }
8597
8598         pass = ipf_scanlist(fin, pass);
8599
8600         /*
8601          * Copy the packet filter "result" fields out of the fr_info_t struct
8602          * that is local to the decapsulation processing and back into the
8603          * one we were called with.
8604          */
8605         fino->fin_flx = fin->fin_flx;
8606         fino->fin_rev = fin->fin_rev;
8607         fino->fin_icode = fin->fin_icode;
8608         fino->fin_rule = fin->fin_rule;
8609         (void) strncpy(fino->fin_group, fin->fin_group, FR_GROUPLEN);
8610         fino->fin_fr = fin->fin_fr;
8611         fino->fin_error = fin->fin_error;
8612         fino->fin_mp = fin->fin_mp;
8613         fino->fin_m = fin->fin_m;
8614         m = fin->fin_m;
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         return pass;
8624 }
8625
8626
8627 /* ------------------------------------------------------------------------ */
8628 /* Function:    ipf_matcharray_load                                         */
8629 /* Returns:     int         - 0 = success, else error                       */
8630 /* Parameters:  softc(I)    - pointer to soft context main structure        */
8631 /*              data(I)     - pointer to ioctl data                         */
8632 /*              objp(I)     - ipfobj_t structure to load data into          */
8633 /*              arrayptr(I) - pointer to location to store array pointer    */
8634 /*                                                                          */
8635 /* This function loads in a mathing array through the ipfobj_t struct that  */
8636 /* describes it.  Sanity checking and array size limitations are enforced   */
8637 /* in this function to prevent userspace from trying to load in something   */
8638 /* that is insanely big.  Once the size of the array is known, the memory   */
8639 /* required is malloc'd and returned through changing *arrayptr.  The       */
8640 /* contents of the array are verified before returning.  Only in the event  */
8641 /* of a successful call is the caller required to free up the malloc area.  */
8642 /* ------------------------------------------------------------------------ */
8643 int
8644 ipf_matcharray_load(softc, data, objp, arrayptr)
8645         ipf_main_softc_t *softc;
8646         caddr_t data;
8647         ipfobj_t *objp;
8648         int **arrayptr;
8649 {
8650         int arraysize, *array, error;
8651
8652         *arrayptr = NULL;
8653
8654         error = BCOPYIN(data, objp, sizeof(*objp));
8655         if (error != 0) {
8656                 IPFERROR(116);
8657                 return EFAULT;
8658         }
8659
8660         if (objp->ipfo_type != IPFOBJ_IPFEXPR) {
8661                 IPFERROR(117);
8662                 return EINVAL;
8663         }
8664
8665         if (((objp->ipfo_size & 3) != 0) || (objp->ipfo_size == 0) ||
8666             (objp->ipfo_size > 1024)) {
8667                 IPFERROR(118);
8668                 return EINVAL;
8669         }
8670
8671         arraysize = objp->ipfo_size * sizeof(*array);
8672         KMALLOCS(array, int *, arraysize);
8673         if (array == NULL) {
8674                 IPFERROR(119);
8675                 return ENOMEM;
8676         }
8677
8678         error = COPYIN(objp->ipfo_ptr, array, arraysize);
8679         if (error != 0) {
8680                 KFREES(array, arraysize);
8681                 IPFERROR(120);
8682                 return EFAULT;
8683         }
8684
8685         if (ipf_matcharray_verify(array, arraysize) != 0) {
8686                 KFREES(array, arraysize);
8687                 IPFERROR(121);
8688                 return EINVAL;
8689         }
8690
8691         *arrayptr = array;
8692         return 0;
8693 }
8694
8695
8696 /* ------------------------------------------------------------------------ */
8697 /* Function:    ipf_matcharray_verify                                       */
8698 /* Returns:     Nil                                                         */
8699 /* Parameters:  array(I)     - pointer to matching array                    */
8700 /*              arraysize(I) - number of elements in the array              */
8701 /*                                                                          */
8702 /* Verify the contents of a matching array by stepping through each element */
8703 /* in it.  The actual commands in the array are not verified for            */
8704 /* correctness, only that all of the sizes are correctly within limits.     */
8705 /* ------------------------------------------------------------------------ */
8706 int
8707 ipf_matcharray_verify(array, arraysize)
8708         int *array, arraysize;
8709 {
8710         int i, nelem, maxidx;
8711         ipfexp_t *e;
8712
8713         nelem = arraysize / sizeof(*array);
8714
8715         /*
8716          * Currently, it makes no sense to have an array less than 6
8717          * elements long - the initial size at the from, a single operation
8718          * (minimum 4 in length) and a trailer, for a total of 6.
8719          */
8720         if ((array[0] < 6) || (arraysize < 24) || (arraysize > 4096)) {
8721                 return -1;
8722         }
8723
8724         /*
8725          * Verify the size of data pointed to by array with how long
8726          * the array claims to be itself.
8727          */
8728         if (array[0] * sizeof(*array) != arraysize) {
8729                 return -1;
8730         }
8731
8732         maxidx = nelem - 1;
8733         /*
8734          * The last opcode in this array should be an IPF_EXP_END.
8735          */
8736         if (array[maxidx] != IPF_EXP_END) {
8737                 return -1;
8738         }
8739
8740         for (i = 1; i < maxidx; ) {
8741                 e = (ipfexp_t *)(array + i);
8742
8743                 /*
8744                  * The length of the bits to check must be at least 1
8745                  * (or else there is nothing to comapre with!) and it
8746                  * cannot exceed the length of the data present.
8747                  */
8748                 if ((e->ipfe_size < 1 ) ||
8749                     (e->ipfe_size + i > maxidx)) {
8750                         return -1;
8751                 }
8752                 i += e->ipfe_size;
8753         }
8754         return 0;
8755 }
8756
8757
8758 /* ------------------------------------------------------------------------ */
8759 /* Function:    ipf_fr_matcharray                                           */
8760 /* Returns:     int      - 0 = match failed, else positive match            */
8761 /* Parameters:  fin(I)   - pointer to packet information                    */
8762 /*              array(I) - pointer to matching array                        */
8763 /*                                                                          */
8764 /* This function is used to apply a matching array against a packet and     */
8765 /* return an indication of whether or not the packet successfully matches   */
8766 /* all of the commands in it.                                               */
8767 /* ------------------------------------------------------------------------ */
8768 static int
8769 ipf_fr_matcharray(fin, array)
8770         fr_info_t *fin;
8771         int *array;
8772 {
8773         int i, n, *x, rv, p;
8774         ipfexp_t *e;
8775
8776         rv = 0;
8777         n = array[0];
8778         x = array + 1;
8779
8780         for (; n > 0; x += 3 + x[3], rv = 0) {
8781                 e = (ipfexp_t *)x;
8782                 if (e->ipfe_cmd == IPF_EXP_END)
8783                         break;
8784                 n -= e->ipfe_size;
8785
8786                 /*
8787                  * The upper 16 bits currently store the protocol value.
8788                  * This is currently used with TCP and UDP port compares and
8789                  * allows "tcp.port = 80" without requiring an explicit
8790                  " "ip.pr = tcp" first.
8791                  */
8792                 p = e->ipfe_cmd >> 16;
8793                 if ((p != 0) && (p != fin->fin_p))
8794                         break;
8795
8796                 switch (e->ipfe_cmd)
8797                 {
8798                 case IPF_EXP_IP_PR :
8799                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8800                                 rv |= (fin->fin_p == e->ipfe_arg0[i]);
8801                         }
8802                         break;
8803
8804                 case IPF_EXP_IP_SRCADDR :
8805                         if (fin->fin_v != 4)
8806                                 break;
8807                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8808                                 rv |= ((fin->fin_saddr &
8809                                         e->ipfe_arg0[i * 2 + 1]) ==
8810                                        e->ipfe_arg0[i * 2]);
8811                         }
8812                         break;
8813
8814                 case IPF_EXP_IP_DSTADDR :
8815                         if (fin->fin_v != 4)
8816                                 break;
8817                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8818                                 rv |= ((fin->fin_daddr &
8819                                         e->ipfe_arg0[i * 2 + 1]) ==
8820                                        e->ipfe_arg0[i * 2]);
8821                         }
8822                         break;
8823
8824                 case IPF_EXP_IP_ADDR :
8825                         if (fin->fin_v != 4)
8826                                 break;
8827                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8828                                 rv |= ((fin->fin_saddr &
8829                                         e->ipfe_arg0[i * 2 + 1]) ==
8830                                        e->ipfe_arg0[i * 2]) ||
8831                                       ((fin->fin_daddr &
8832                                         e->ipfe_arg0[i * 2 + 1]) ==
8833                                        e->ipfe_arg0[i * 2]);
8834                         }
8835                         break;
8836
8837 #ifdef USE_INET6
8838                 case IPF_EXP_IP6_SRCADDR :
8839                         if (fin->fin_v != 6)
8840                                 break;
8841                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8842                                 rv |= IP6_MASKEQ(&fin->fin_src6,
8843                                                  &e->ipfe_arg0[i * 8 + 4],
8844                                                  &e->ipfe_arg0[i * 8]);
8845                         }
8846                         break;
8847
8848                 case IPF_EXP_IP6_DSTADDR :
8849                         if (fin->fin_v != 6)
8850                                 break;
8851                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8852                                 rv |= IP6_MASKEQ(&fin->fin_dst6,
8853                                                  &e->ipfe_arg0[i * 8 + 4],
8854                                                  &e->ipfe_arg0[i * 8]);
8855                         }
8856                         break;
8857
8858                 case IPF_EXP_IP6_ADDR :
8859                         if (fin->fin_v != 6)
8860                                 break;
8861                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8862                                 rv |= IP6_MASKEQ(&fin->fin_src6,
8863                                                  &e->ipfe_arg0[i * 8 + 4],
8864                                                  &e->ipfe_arg0[i * 8]) ||
8865                                       IP6_MASKEQ(&fin->fin_dst6,
8866                                                  &e->ipfe_arg0[i * 8 + 4],
8867                                                  &e->ipfe_arg0[i * 8]);
8868                         }
8869                         break;
8870 #endif
8871
8872                 case IPF_EXP_UDP_PORT :
8873                 case IPF_EXP_TCP_PORT :
8874                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8875                                 rv |= (fin->fin_sport == e->ipfe_arg0[i]) ||
8876                                       (fin->fin_dport == e->ipfe_arg0[i]);
8877                         }
8878                         break;
8879
8880                 case IPF_EXP_UDP_SPORT :
8881                 case IPF_EXP_TCP_SPORT :
8882                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8883                                 rv |= (fin->fin_sport == e->ipfe_arg0[i]);
8884                         }
8885                         break;
8886
8887                 case IPF_EXP_UDP_DPORT :
8888                 case IPF_EXP_TCP_DPORT :
8889                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8890                                 rv |= (fin->fin_dport == e->ipfe_arg0[i]);
8891                         }
8892                         break;
8893
8894                 case IPF_EXP_TCP_FLAGS :
8895                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8896                                 rv |= ((fin->fin_tcpf &
8897                                         e->ipfe_arg0[i * 2 + 1]) ==
8898                                        e->ipfe_arg0[i * 2]);
8899                         }
8900                         break;
8901                 }
8902                 rv ^= e->ipfe_not;
8903
8904                 if (rv == 0)
8905                         break;
8906         }
8907
8908         return rv;
8909 }
8910
8911
8912 /* ------------------------------------------------------------------------ */
8913 /* Function:    ipf_queueflush                                              */
8914 /* Returns:     int - number of entries flushed (0 = none)                  */
8915 /* Parameters:  softc(I)    - pointer to soft context main structure        */
8916 /*              deletefn(I) - function to call to delete entry              */
8917 /*              ipfqs(I)    - top of the list of ipf internal queues        */
8918 /*              userqs(I)   - top of the list of user defined timeouts      */
8919 /*                                                                          */
8920 /* This fucntion gets called when the state/NAT hash tables fill up and we  */
8921 /* need to try a bit harder to free up some space.  The algorithm used here */
8922 /* split into two parts but both halves have the same goal: to reduce the   */
8923 /* number of connections considered to be "active" to the low watermark.    */
8924 /* There are two steps in doing this:                                       */
8925 /* 1) Remove any TCP connections that are already considered to be "closed" */
8926 /*    but have not yet been removed from the state table.  The two states   */
8927 /*    TCPS_TIME_WAIT and TCPS_CLOSED are considered to be the perfect       */
8928 /*    candidates for this style of removal.  If freeing up entries in       */
8929 /*    CLOSED or both CLOSED and TIME_WAIT brings us to the low watermark,   */
8930 /*    we do not go on to step 2.                                            */
8931 /*                                                                          */
8932 /* 2) Look for the oldest entries on each timeout queue and free them if    */
8933 /*    they are within the given window we are considering.  Where the       */
8934 /*    window starts and the steps taken to increase its size depend upon    */
8935 /*    how long ipf has been running (ipf_ticks.)  Anything modified in the  */
8936 /*    last 30 seconds is not touched.                                       */
8937 /*                                              touched                     */
8938 /*         die     ipf_ticks  30*1.5    1800*1.5   |  43200*1.5             */
8939 /*           |          |        |           |     |     |                  */
8940 /* future <--+----------+--------+-----------+-----+-----+-----------> past */
8941 /*                     now        \_int=30s_/ \_int=1hr_/ \_int=12hr        */
8942 /*                                                                          */
8943 /* Points to note:                                                          */
8944 /* - tqe_die is the time, in the future, when entries die.                  */
8945 /* - tqe_die - ipf_ticks is how long left the connection has to live in ipf */
8946 /*   ticks.                                                                 */
8947 /* - tqe_touched is when the entry was last used by NAT/state               */
8948 /* - the closer tqe_touched is to ipf_ticks, the further tqe_die will be    */
8949 /*   ipf_ticks any given timeout queue and vice versa.                      */
8950 /* - both tqe_die and tqe_touched increase over time                        */
8951 /* - timeout queues are sorted with the highest value of tqe_die at the     */
8952 /*   bottom and therefore the smallest values of each are at the top        */
8953 /* - the pointer passed in as ipfqs should point to an array of timeout     */
8954 /*   queues representing each of the TCP states                             */
8955 /*                                                                          */
8956 /* We start by setting up a maximum range to scan for things to move of     */
8957 /* iend (newest) to istart (oldest) in chunks of "interval".  If nothing is */
8958 /* found in that range, "interval" is adjusted (so long as it isn't 30) and */
8959 /* we start again with a new value for "iend" and "istart".  This is        */
8960 /* continued until we either finish the scan of 30 second intervals or the  */
8961 /* low water mark is reached.                                               */
8962 /* ------------------------------------------------------------------------ */
8963 int
8964 ipf_queueflush(softc, deletefn, ipfqs, userqs, activep, size, low)
8965         ipf_main_softc_t *softc;
8966         ipftq_delete_fn_t deletefn;
8967         ipftq_t *ipfqs, *userqs;
8968         u_int *activep;
8969         int size, low;
8970 {
8971         u_long interval, istart, iend;
8972         ipftq_t *ifq, *ifqnext;
8973         ipftqent_t *tqe, *tqn;
8974         int removed = 0;
8975
8976         for (tqn = ipfqs[IPF_TCPS_CLOSED].ifq_head; ((tqe = tqn) != NULL); ) {
8977                 tqn = tqe->tqe_next;
8978                 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
8979                         removed++;
8980         }
8981         if ((*activep * 100 / size) > low) {
8982                 for (tqn = ipfqs[IPF_TCPS_TIME_WAIT].ifq_head;
8983                      ((tqe = tqn) != NULL); ) {
8984                         tqn = tqe->tqe_next;
8985                         if ((*deletefn)(softc, tqe->tqe_parent) == 0)
8986                                 removed++;
8987                 }
8988         }
8989
8990         if ((*activep * 100 / size) <= low) {
8991                 return removed;
8992         }
8993
8994         /*
8995          * NOTE: Use of "* 15 / 10" is required here because if "* 1.5" is
8996          *       used then the operations are upgraded to floating point
8997          *       and kernels don't like floating point...
8998          */
8999         if (softc->ipf_ticks > IPF_TTLVAL(43200 * 15 / 10)) {
9000                 istart = IPF_TTLVAL(86400 * 4);
9001                 interval = IPF_TTLVAL(43200);
9002         } else if (softc->ipf_ticks > IPF_TTLVAL(1800 * 15 / 10)) {
9003                 istart = IPF_TTLVAL(43200);
9004                 interval = IPF_TTLVAL(1800);
9005         } else if (softc->ipf_ticks > IPF_TTLVAL(30 * 15 / 10)) {
9006                 istart = IPF_TTLVAL(1800);
9007                 interval = IPF_TTLVAL(30);
9008         } else {
9009                 return 0;
9010         }
9011         if (istart > softc->ipf_ticks) {
9012                 if (softc->ipf_ticks - interval < interval)
9013                         istart = interval;
9014                 else
9015                         istart = (softc->ipf_ticks / interval) * interval;
9016         }
9017
9018         iend = softc->ipf_ticks - interval;
9019
9020         while ((*activep * 100 / size) > low) {
9021                 u_long try;
9022
9023                 try = softc->ipf_ticks - istart;
9024
9025                 for (ifq = ipfqs; ifq != NULL; ifq = ifq->ifq_next) {
9026                         for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); ) {
9027                                 if (try < tqe->tqe_touched)
9028                                         break;
9029                                 tqn = tqe->tqe_next;
9030                                 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9031                                         removed++;
9032                         }
9033                 }
9034
9035                 for (ifq = userqs; ifq != NULL; ifq = ifqnext) {
9036                         ifqnext = ifq->ifq_next;
9037
9038                         for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); ) {
9039                                 if (try < tqe->tqe_touched)
9040                                         break;
9041                                 tqn = tqe->tqe_next;
9042                                 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9043                                         removed++;
9044                         }
9045                 }
9046
9047                 if (try >= iend) {
9048                         if (interval == IPF_TTLVAL(43200)) {
9049                                 interval = IPF_TTLVAL(1800);
9050                         } else if (interval == IPF_TTLVAL(1800)) {
9051                                 interval = IPF_TTLVAL(30);
9052                         } else {
9053                                 break;
9054                         }
9055                         if (interval >= softc->ipf_ticks)
9056                                 break;
9057
9058                         iend = softc->ipf_ticks - interval;
9059                 }
9060                 istart -= interval;
9061         }
9062
9063         return removed;
9064 }
9065
9066
9067 /* ------------------------------------------------------------------------ */
9068 /* Function:    ipf_deliverlocal                                            */
9069 /* Returns:     int - 1 = local address, 0 = non-local address              */
9070 /* Parameters:  softc(I)     - pointer to soft context main structure       */
9071 /*              ipversion(I) - IP protocol version (4 or 6)                 */
9072 /*              ifp(I)       - network interface pointer                    */
9073 /*              ipaddr(I)    - IPv4/6 destination address                   */
9074 /*                                                                          */
9075 /* This fucntion is used to determine in the address "ipaddr" belongs to    */
9076 /* the network interface represented by ifp.                                */
9077 /* ------------------------------------------------------------------------ */
9078 int
9079 ipf_deliverlocal(softc, ipversion, ifp, ipaddr)
9080         ipf_main_softc_t *softc;
9081         int ipversion;
9082         void *ifp;
9083         i6addr_t *ipaddr;
9084 {
9085         i6addr_t addr;
9086         int islocal = 0;
9087
9088         if (ipversion == 4) {
9089                 if (ipf_ifpaddr(softc, 4, FRI_NORMAL, ifp, &addr, NULL) == 0) {
9090                         if (addr.in4.s_addr == ipaddr->in4.s_addr)
9091                                 islocal = 1;
9092                 }
9093
9094 #ifdef USE_INET6
9095         } else if (ipversion == 6) {
9096                 if (ipf_ifpaddr(softc, 6, FRI_NORMAL, ifp, &addr, NULL) == 0) {
9097                         if (IP6_EQ(&addr, ipaddr))
9098                                 islocal = 1;
9099                 }
9100 #endif
9101         }
9102
9103         return islocal;
9104 }
9105
9106
9107 /* ------------------------------------------------------------------------ */
9108 /* Function:    ipf_settimeout                                              */
9109 /* Returns:     int - 0 = success, -1 = failure                             */
9110 /* Parameters:  softc(I) - pointer to soft context main structure           */
9111 /*              t(I)     - pointer to tuneable array entry                  */
9112 /*              p(I)     - pointer to values passed in to apply             */
9113 /*                                                                          */
9114 /* This function is called to set the timeout values for each distinct      */
9115 /* queue timeout that is available.  When called, it calls into both the    */
9116 /* state and NAT code, telling them to update their timeout queues.         */
9117 /* ------------------------------------------------------------------------ */
9118 static int
9119 ipf_settimeout(softc, t, p)
9120         struct ipf_main_softc_s *softc;
9121         ipftuneable_t *t;
9122         ipftuneval_t *p;
9123 {
9124
9125         /*
9126          * ipf_interror should be set by the functions called here, not
9127          * by this function - it's just a middle man.
9128          */
9129         if (ipf_state_settimeout(softc, t, p) == -1)
9130                 return -1;
9131         if (ipf_nat_settimeout(softc, t, p) == -1)
9132                 return -1;
9133         return 0;
9134 }
9135
9136
9137 /* ------------------------------------------------------------------------ */
9138 /* Function:    ipf_apply_timeout                                           */
9139 /* Returns:     int - 0 = success, -1 = failure                             */
9140 /* Parameters:  head(I)    - pointer to tuneable array entry                */
9141 /*              seconds(I) - pointer to values passed in to apply           */
9142 /*                                                                          */
9143 /* This function applies a timeout of "seconds" to the timeout queue that   */
9144 /* is pointed to by "head".  All entries on this list have an expiration    */
9145 /* set to be the current tick value of ipf plus the ttl.  Given that this   */
9146 /* function should only be called when the delta is non-zero, the task is   */
9147 /* to walk the entire list and apply the change.  The sort order will not   */
9148 /* change.  The only catch is that this is O(n) across the list, so if the  */
9149 /* queue has lots of entries (10s of thousands or 100s of thousands), it    */
9150 /* could take a relatively long time to work through them all.              */
9151 /* ------------------------------------------------------------------------ */
9152 void
9153 ipf_apply_timeout(head, seconds)
9154         ipftq_t *head;
9155         u_int seconds;
9156 {
9157         u_int oldtimeout, newtimeout;
9158         ipftqent_t *tqe;
9159         int delta;
9160
9161         MUTEX_ENTER(&head->ifq_lock);
9162         oldtimeout = head->ifq_ttl;
9163         newtimeout = IPF_TTLVAL(seconds);
9164         delta = oldtimeout - newtimeout;
9165
9166         head->ifq_ttl = newtimeout;
9167
9168         for (tqe = head->ifq_head; tqe != NULL; tqe = tqe->tqe_next) {
9169                 tqe->tqe_die += delta;
9170         }
9171         MUTEX_EXIT(&head->ifq_lock);
9172 }
9173
9174
9175 /* ------------------------------------------------------------------------ */
9176 /* Function:   ipf_settimeout_tcp                                           */
9177 /* Returns:    int - 0 = successfully applied, -1 = failed                  */
9178 /* Parameters: t(I)   - pointer to tuneable to change                       */
9179 /*             p(I)   - pointer to new timeout information                  */
9180 /*             tab(I) - pointer to table of TCP queues                      */
9181 /*                                                                          */
9182 /* This function applies the new timeout (p) to the TCP tunable (t) and     */
9183 /* updates all of the entries on the relevant timeout queue by calling      */
9184 /* ipf_apply_timeout().                                                     */
9185 /* ------------------------------------------------------------------------ */
9186 int
9187 ipf_settimeout_tcp(t, p, tab)
9188         ipftuneable_t *t;
9189         ipftuneval_t *p;
9190         ipftq_t *tab;
9191 {
9192         if (!strcmp(t->ipft_name, "tcp_idle_timeout") ||
9193             !strcmp(t->ipft_name, "tcp_established")) {
9194                 ipf_apply_timeout(&tab[IPF_TCPS_ESTABLISHED], p->ipftu_int);
9195         } else if (!strcmp(t->ipft_name, "tcp_close_wait")) {
9196                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSE_WAIT], p->ipftu_int);
9197         } else if (!strcmp(t->ipft_name, "tcp_last_ack")) {
9198                 ipf_apply_timeout(&tab[IPF_TCPS_LAST_ACK], p->ipftu_int);
9199         } else if (!strcmp(t->ipft_name, "tcp_timeout")) {
9200                 ipf_apply_timeout(&tab[IPF_TCPS_LISTEN], p->ipftu_int);
9201                 ipf_apply_timeout(&tab[IPF_TCPS_HALF_ESTAB], p->ipftu_int);
9202                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSING], p->ipftu_int);
9203         } else if (!strcmp(t->ipft_name, "tcp_listen")) {
9204                 ipf_apply_timeout(&tab[IPF_TCPS_LISTEN], p->ipftu_int);
9205         } else if (!strcmp(t->ipft_name, "tcp_half_established")) {
9206                 ipf_apply_timeout(&tab[IPF_TCPS_HALF_ESTAB], p->ipftu_int);
9207         } else if (!strcmp(t->ipft_name, "tcp_closing")) {
9208                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSING], p->ipftu_int);
9209         } else if (!strcmp(t->ipft_name, "tcp_syn_received")) {
9210                 ipf_apply_timeout(&tab[IPF_TCPS_SYN_RECEIVED], p->ipftu_int);
9211         } else if (!strcmp(t->ipft_name, "tcp_syn_sent")) {
9212                 ipf_apply_timeout(&tab[IPF_TCPS_SYN_SENT], p->ipftu_int);
9213         } else if (!strcmp(t->ipft_name, "tcp_closed")) {
9214                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSED], p->ipftu_int);
9215         } else if (!strcmp(t->ipft_name, "tcp_half_closed")) {
9216                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSED], p->ipftu_int);
9217         } else if (!strcmp(t->ipft_name, "tcp_time_wait")) {
9218                 ipf_apply_timeout(&tab[IPF_TCPS_TIME_WAIT], p->ipftu_int);
9219         } else {
9220                 /*
9221                  * ipf_interror isn't set here because it should be set
9222                  * by whatever called this function.
9223                  */
9224                 return -1;
9225         }
9226         return 0;
9227 }
9228
9229
9230 /* ------------------------------------------------------------------------ */
9231 /* Function:   ipf_main_soft_create                                         */
9232 /* Returns:    NULL = failure, else success                                 */
9233 /* Parameters: arg(I) - pointer to soft context structure if already allocd */
9234 /*                                                                          */
9235 /* Create the foundation soft context structure. In circumstances where it  */
9236 /* is not required to dynamically allocate the context, a pointer can be    */
9237 /* passed in (rather than NULL) to a structure to be initialised.           */
9238 /* The main thing of interest is that a number of locks are initialised     */
9239 /* here instead of in the where might be expected - in the relevant create  */
9240 /* function elsewhere.  This is done because the current locking design has */
9241 /* some areas where these locks are used outside of their module.           */
9242 /* Possibly the most important exercise that is done here is setting of all */
9243 /* the timeout values, allowing them to be changed before init().           */
9244 /* ------------------------------------------------------------------------ */
9245 void *
9246 ipf_main_soft_create(arg)
9247         void *arg;
9248 {
9249         ipf_main_softc_t *softc;
9250
9251         if (arg == NULL) {
9252                 KMALLOC(softc, ipf_main_softc_t *);
9253                 if (softc == NULL)
9254                         return NULL;
9255         } else {
9256                 softc = arg;
9257         }
9258
9259         bzero((char *)softc, sizeof(*softc));
9260
9261         /*
9262          * This serves as a flag as to whether or not the softc should be
9263          * free'd when _destroy is called.
9264          */
9265         softc->ipf_dynamic_softc = (arg == NULL) ? 1 : 0;
9266
9267         softc->ipf_tuners = ipf_tune_array_copy(softc,
9268                                                 sizeof(ipf_main_tuneables),
9269                                                 ipf_main_tuneables);
9270         if (softc->ipf_tuners == NULL) {
9271                 ipf_main_soft_destroy(softc);
9272                 return NULL;
9273         }
9274
9275         MUTEX_INIT(&softc->ipf_rw, "ipf rw mutex");
9276         MUTEX_INIT(&softc->ipf_timeoutlock, "ipf timeout lock");
9277         RWLOCK_INIT(&softc->ipf_global, "ipf filter load/unload mutex");
9278         RWLOCK_INIT(&softc->ipf_mutex, "ipf filter rwlock");
9279         RWLOCK_INIT(&softc->ipf_tokens, "ipf token rwlock");
9280         RWLOCK_INIT(&softc->ipf_state, "ipf state rwlock");
9281         RWLOCK_INIT(&softc->ipf_nat, "ipf IP NAT rwlock");
9282         RWLOCK_INIT(&softc->ipf_poolrw, "ipf pool rwlock");
9283         RWLOCK_INIT(&softc->ipf_frag, "ipf frag rwlock");
9284
9285         softc->ipf_token_head = NULL;
9286         softc->ipf_token_tail = &softc->ipf_token_head;
9287
9288         softc->ipf_tcpidletimeout = FIVE_DAYS;
9289         softc->ipf_tcpclosewait = IPF_TTLVAL(2 * TCP_MSL);
9290         softc->ipf_tcplastack = IPF_TTLVAL(30);
9291         softc->ipf_tcptimewait = IPF_TTLVAL(2 * TCP_MSL);
9292         softc->ipf_tcptimeout = IPF_TTLVAL(2 * TCP_MSL);
9293         softc->ipf_tcpsynsent = IPF_TTLVAL(2 * TCP_MSL);
9294         softc->ipf_tcpsynrecv = IPF_TTLVAL(2 * TCP_MSL);
9295         softc->ipf_tcpclosed = IPF_TTLVAL(30);
9296         softc->ipf_tcphalfclosed = IPF_TTLVAL(2 * 3600);
9297         softc->ipf_udptimeout = IPF_TTLVAL(120);
9298         softc->ipf_udpacktimeout = IPF_TTLVAL(12);
9299         softc->ipf_icmptimeout = IPF_TTLVAL(60);
9300         softc->ipf_icmpacktimeout = IPF_TTLVAL(6);
9301         softc->ipf_iptimeout = IPF_TTLVAL(60);
9302
9303 #if defined(IPFILTER_DEFAULT_BLOCK)
9304         softc->ipf_pass = FR_BLOCK|FR_NOMATCH;
9305 #else
9306         softc->ipf_pass = (IPF_DEFAULT_PASS)|FR_NOMATCH;
9307 #endif
9308         softc->ipf_minttl = 4;
9309         softc->ipf_icmpminfragmtu = 68;
9310         softc->ipf_flags = IPF_LOGGING;
9311
9312         return softc;
9313 }
9314
9315 /* ------------------------------------------------------------------------ */
9316 /* Function:   ipf_main_soft_init                                           */
9317 /* Returns:    0 = success, -1 = failure                                    */
9318 /* Parameters: softc(I) - pointer to soft context main structure            */
9319 /*                                                                          */
9320 /* A null-op function that exists as a placeholder so that the flow in      */
9321 /* other functions is obvious.                                              */
9322 /* ------------------------------------------------------------------------ */
9323 /*ARGSUSED*/
9324 int
9325 ipf_main_soft_init(softc)
9326         ipf_main_softc_t *softc;
9327 {
9328         return 0;
9329 }
9330
9331
9332 /* ------------------------------------------------------------------------ */
9333 /* Function:   ipf_main_soft_destroy                                        */
9334 /* Returns:    void                                                         */
9335 /* Parameters: softc(I) - pointer to soft context main structure            */
9336 /*                                                                          */
9337 /* Undo everything that we did in ipf_main_soft_create.                     */
9338 /*                                                                          */
9339 /* The most important check that needs to be made here is whether or not    */
9340 /* the structure was allocated by ipf_main_soft_create() by checking what   */
9341 /* value is stored in ipf_dynamic_main.                                     */
9342 /* ------------------------------------------------------------------------ */
9343 /*ARGSUSED*/
9344 void
9345 ipf_main_soft_destroy(softc)
9346         ipf_main_softc_t *softc;
9347 {
9348
9349         RW_DESTROY(&softc->ipf_frag);
9350         RW_DESTROY(&softc->ipf_poolrw);
9351         RW_DESTROY(&softc->ipf_nat);
9352         RW_DESTROY(&softc->ipf_state);
9353         RW_DESTROY(&softc->ipf_tokens);
9354         RW_DESTROY(&softc->ipf_mutex);
9355         RW_DESTROY(&softc->ipf_global);
9356         MUTEX_DESTROY(&softc->ipf_timeoutlock);
9357         MUTEX_DESTROY(&softc->ipf_rw);
9358
9359         if (softc->ipf_tuners != NULL) {
9360                 KFREES(softc->ipf_tuners, sizeof(ipf_main_tuneables));
9361         }
9362         if (softc->ipf_dynamic_softc == 1) {
9363                 KFREE(softc);
9364         }
9365 }
9366
9367
9368 /* ------------------------------------------------------------------------ */
9369 /* Function:   ipf_main_soft_fini                                           */
9370 /* Returns:    0 = success, -1 = failure                                    */
9371 /* Parameters: softc(I) - pointer to soft context main structure            */
9372 /*                                                                          */
9373 /* Clean out the rules which have been added since _init was last called,   */
9374 /* the only dynamic part of the mainline.                                   */
9375 /* ------------------------------------------------------------------------ */
9376 int
9377 ipf_main_soft_fini(softc)
9378         ipf_main_softc_t *softc;
9379 {
9380         (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
9381         (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE);
9382         (void) ipf_flush(softc, IPL_LOGCOUNT, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
9383         (void) ipf_flush(softc, IPL_LOGCOUNT, FR_INQUE|FR_OUTQUE);
9384
9385         return 0;
9386 }
9387
9388
9389 /* ------------------------------------------------------------------------ */
9390 /* Function:   ipf_main_load                                                */
9391 /* Returns:    0 = success, -1 = failure                                    */
9392 /* Parameters: none                                                         */
9393 /*                                                                          */
9394 /* Handle global initialisation that needs to be done for the base part of  */
9395 /* IPFilter. At present this just amounts to initialising some ICMP lookup  */
9396 /* arrays that get used by the state/NAT code.                              */
9397 /* ------------------------------------------------------------------------ */
9398 int
9399 ipf_main_load()
9400 {
9401         int i;
9402
9403         /* fill icmp reply type table */
9404         for (i = 0; i <= ICMP_MAXTYPE; i++)
9405                 icmpreplytype4[i] = -1;
9406         icmpreplytype4[ICMP_ECHO] = ICMP_ECHOREPLY;
9407         icmpreplytype4[ICMP_TSTAMP] = ICMP_TSTAMPREPLY;
9408         icmpreplytype4[ICMP_IREQ] = ICMP_IREQREPLY;
9409         icmpreplytype4[ICMP_MASKREQ] = ICMP_MASKREPLY;
9410
9411 #ifdef  USE_INET6
9412         /* fill icmp reply type table */
9413         for (i = 0; i <= ICMP6_MAXTYPE; i++)
9414                 icmpreplytype6[i] = -1;
9415         icmpreplytype6[ICMP6_ECHO_REQUEST] = ICMP6_ECHO_REPLY;
9416         icmpreplytype6[ICMP6_MEMBERSHIP_QUERY] = ICMP6_MEMBERSHIP_REPORT;
9417         icmpreplytype6[ICMP6_NI_QUERY] = ICMP6_NI_REPLY;
9418         icmpreplytype6[ND_ROUTER_SOLICIT] = ND_ROUTER_ADVERT;
9419         icmpreplytype6[ND_NEIGHBOR_SOLICIT] = ND_NEIGHBOR_ADVERT;
9420 #endif
9421
9422         return 0;
9423 }
9424
9425
9426 /* ------------------------------------------------------------------------ */
9427 /* Function:   ipf_main_unload                                              */
9428 /* Returns:    0 = success, -1 = failure                                    */
9429 /* Parameters: none                                                         */
9430 /*                                                                          */
9431 /* A null-op function that exists as a placeholder so that the flow in      */
9432 /* other functions is obvious.                                              */
9433 /* ------------------------------------------------------------------------ */
9434 int
9435 ipf_main_unload()
9436 {
9437         return 0;
9438 }
9439
9440
9441 /* ------------------------------------------------------------------------ */
9442 /* Function:   ipf_load_all                                                 */
9443 /* Returns:    0 = success, -1 = failure                                    */
9444 /* Parameters: none                                                         */
9445 /*                                                                          */
9446 /* Work through all of the subsystems inside IPFilter and call the load     */
9447 /* function for each in an order that won't lead to a crash :)              */
9448 /* ------------------------------------------------------------------------ */
9449 int
9450 ipf_load_all()
9451 {
9452         if (ipf_main_load() == -1)
9453                 return -1;
9454
9455         if (ipf_state_main_load() == -1)
9456                 return -1;
9457
9458         if (ipf_nat_main_load() == -1)
9459                 return -1;
9460
9461         if (ipf_frag_main_load() == -1)
9462                 return -1;
9463
9464         if (ipf_auth_main_load() == -1)
9465                 return -1;
9466
9467         if (ipf_proxy_main_load() == -1)
9468                 return -1;
9469
9470         return 0;
9471 }
9472
9473
9474 /* ------------------------------------------------------------------------ */
9475 /* Function:   ipf_unload_all                                               */
9476 /* Returns:    0 = success, -1 = failure                                    */
9477 /* Parameters: none                                                         */
9478 /*                                                                          */
9479 /* Work through all of the subsystems inside IPFilter and call the unload   */
9480 /* function for each in an order that won't lead to a crash :)              */
9481 /* ------------------------------------------------------------------------ */
9482 int
9483 ipf_unload_all()
9484 {
9485         if (ipf_proxy_main_unload() == -1)
9486                 return -1;
9487
9488         if (ipf_auth_main_unload() == -1)
9489                 return -1;
9490
9491         if (ipf_frag_main_unload() == -1)
9492                 return -1;
9493
9494         if (ipf_nat_main_unload() == -1)
9495                 return -1;
9496
9497         if (ipf_state_main_unload() == -1)
9498                 return -1;
9499
9500         if (ipf_main_unload() == -1)
9501                 return -1;
9502
9503         return 0;
9504 }
9505
9506
9507 /* ------------------------------------------------------------------------ */
9508 /* Function:   ipf_create_all                                               */
9509 /* Returns:    NULL = failure, else success                                 */
9510 /* Parameters: arg(I) - pointer to soft context main structure              */
9511 /*                                                                          */
9512 /* Work through all of the subsystems inside IPFilter and call the create   */
9513 /* function for each in an order that won't lead to a crash :)              */
9514 /* ------------------------------------------------------------------------ */
9515 ipf_main_softc_t *
9516 ipf_create_all(arg)
9517         void *arg;
9518 {
9519         ipf_main_softc_t *softc;
9520
9521         softc = ipf_main_soft_create(arg);
9522         if (softc == NULL)
9523                 return NULL;
9524
9525 #ifdef IPFILTER_LOG
9526         softc->ipf_log_soft = ipf_log_soft_create(softc);
9527         if (softc->ipf_log_soft == NULL) {
9528                 ipf_destroy_all(softc);
9529                 return NULL;
9530         }
9531 #endif
9532
9533         softc->ipf_lookup_soft = ipf_lookup_soft_create(softc);
9534         if (softc->ipf_lookup_soft == NULL) {
9535                 ipf_destroy_all(softc);
9536                 return NULL;
9537         }
9538
9539         softc->ipf_sync_soft = ipf_sync_soft_create(softc);
9540         if (softc->ipf_sync_soft == NULL) {
9541                 ipf_destroy_all(softc);
9542                 return NULL;
9543         }
9544
9545         softc->ipf_state_soft = ipf_state_soft_create(softc);
9546         if (softc->ipf_state_soft == NULL) {
9547                 ipf_destroy_all(softc);
9548                 return NULL;
9549         }
9550
9551         softc->ipf_nat_soft = ipf_nat_soft_create(softc);
9552         if (softc->ipf_nat_soft == NULL) {
9553                 ipf_destroy_all(softc);
9554                 return NULL;
9555         }
9556
9557         softc->ipf_frag_soft = ipf_frag_soft_create(softc);
9558         if (softc->ipf_frag_soft == NULL) {
9559                 ipf_destroy_all(softc);
9560                 return NULL;
9561         }
9562
9563         softc->ipf_auth_soft = ipf_auth_soft_create(softc);
9564         if (softc->ipf_auth_soft == NULL) {
9565                 ipf_destroy_all(softc);
9566                 return NULL;
9567         }
9568
9569         softc->ipf_proxy_soft = ipf_proxy_soft_create(softc);
9570         if (softc->ipf_proxy_soft == NULL) {
9571                 ipf_destroy_all(softc);
9572                 return NULL;
9573         }
9574
9575         return softc;
9576 }
9577
9578
9579 /* ------------------------------------------------------------------------ */
9580 /* Function:   ipf_destroy_all                                              */
9581 /* Returns:    void                                                         */
9582 /* Parameters: softc(I) - pointer to soft context main structure            */
9583 /*                                                                          */
9584 /* Work through all of the subsystems inside IPFilter and call the destroy  */
9585 /* function for each in an order that won't lead to a crash :)              */
9586 /*                                                                          */
9587 /* Every one of these functions is expected to succeed, so there is no      */
9588 /* checking of return values.                                               */
9589 /* ------------------------------------------------------------------------ */
9590 void
9591 ipf_destroy_all(softc)
9592         ipf_main_softc_t *softc;
9593 {
9594
9595         if (softc->ipf_state_soft != NULL) {
9596                 ipf_state_soft_destroy(softc, softc->ipf_state_soft);
9597                 softc->ipf_state_soft = NULL;
9598         }
9599
9600         if (softc->ipf_nat_soft != NULL) {
9601                 ipf_nat_soft_destroy(softc, softc->ipf_nat_soft);
9602                 softc->ipf_nat_soft = NULL;
9603         }
9604
9605         if (softc->ipf_frag_soft != NULL) {
9606                 ipf_frag_soft_destroy(softc, softc->ipf_frag_soft);
9607                 softc->ipf_frag_soft = NULL;
9608         }
9609
9610         if (softc->ipf_auth_soft != NULL) {
9611                 ipf_auth_soft_destroy(softc, softc->ipf_auth_soft);
9612                 softc->ipf_auth_soft = NULL;
9613         }
9614
9615         if (softc->ipf_proxy_soft != NULL) {
9616                 ipf_proxy_soft_destroy(softc, softc->ipf_proxy_soft);
9617                 softc->ipf_proxy_soft = NULL;
9618         }
9619
9620         if (softc->ipf_sync_soft != NULL) {
9621                 ipf_sync_soft_destroy(softc, softc->ipf_sync_soft);
9622                 softc->ipf_sync_soft = NULL;
9623         }
9624
9625         if (softc->ipf_lookup_soft != NULL) {
9626                 ipf_lookup_soft_destroy(softc, softc->ipf_lookup_soft);
9627                 softc->ipf_lookup_soft = NULL;
9628         }
9629
9630 #ifdef IPFILTER_LOG
9631         if (softc->ipf_log_soft != NULL) {
9632                 ipf_log_soft_destroy(softc, softc->ipf_log_soft);
9633                 softc->ipf_log_soft = NULL;
9634         }
9635 #endif
9636
9637         ipf_main_soft_destroy(softc);
9638 }
9639
9640
9641 /* ------------------------------------------------------------------------ */
9642 /* Function:   ipf_init_all                                                 */
9643 /* Returns:    0 = success, -1 = failure                                    */
9644 /* Parameters: softc(I) - pointer to soft context main structure            */
9645 /*                                                                          */
9646 /* Work through all of the subsystems inside IPFilter and call the init     */
9647 /* function for each in an order that won't lead to a crash :)              */
9648 /* ------------------------------------------------------------------------ */
9649 int
9650 ipf_init_all(softc)
9651         ipf_main_softc_t *softc;
9652 {
9653
9654         if (ipf_main_soft_init(softc) == -1)
9655                 return -1;
9656
9657 #ifdef IPFILTER_LOG
9658         if (ipf_log_soft_init(softc, softc->ipf_log_soft) == -1)
9659                 return -1;
9660 #endif
9661
9662         if (ipf_lookup_soft_init(softc, softc->ipf_lookup_soft) == -1)
9663                 return -1;
9664
9665         if (ipf_sync_soft_init(softc, softc->ipf_sync_soft) == -1)
9666                 return -1;
9667
9668         if (ipf_state_soft_init(softc, softc->ipf_state_soft) == -1)
9669                 return -1;
9670
9671         if (ipf_nat_soft_init(softc, softc->ipf_nat_soft) == -1)
9672                 return -1;
9673
9674         if (ipf_frag_soft_init(softc, softc->ipf_frag_soft) == -1)
9675                 return -1;
9676
9677         if (ipf_auth_soft_init(softc, softc->ipf_auth_soft) == -1)
9678                 return -1;
9679
9680         if (ipf_proxy_soft_init(softc, softc->ipf_proxy_soft) == -1)
9681                 return -1;
9682
9683         return 0;
9684 }
9685
9686
9687 /* ------------------------------------------------------------------------ */
9688 /* Function:   ipf_fini_all                                                 */
9689 /* Returns:    0 = success, -1 = failure                                    */
9690 /* Parameters: softc(I) - pointer to soft context main structure            */
9691 /*                                                                          */
9692 /* Work through all of the subsystems inside IPFilter and call the fini     */
9693 /* function for each in an order that won't lead to a crash :)              */
9694 /* ------------------------------------------------------------------------ */
9695 int
9696 ipf_fini_all(softc)
9697         ipf_main_softc_t *softc;
9698 {
9699
9700         ipf_token_flush(softc);
9701
9702         if (ipf_proxy_soft_fini(softc, softc->ipf_proxy_soft) == -1)
9703                 return -1;
9704
9705         if (ipf_auth_soft_fini(softc, softc->ipf_auth_soft) == -1)
9706                 return -1;
9707
9708         if (ipf_frag_soft_fini(softc, softc->ipf_frag_soft) == -1)
9709                 return -1;
9710
9711         if (ipf_nat_soft_fini(softc, softc->ipf_nat_soft) == -1)
9712                 return -1;
9713
9714         if (ipf_state_soft_fini(softc, softc->ipf_state_soft) == -1)
9715                 return -1;
9716
9717         if (ipf_sync_soft_fini(softc, softc->ipf_sync_soft) == -1)
9718                 return -1;
9719
9720         if (ipf_lookup_soft_fini(softc, softc->ipf_lookup_soft) == -1)
9721                 return -1;
9722
9723 #ifdef IPFILTER_LOG
9724         if (ipf_log_soft_fini(softc, softc->ipf_log_soft) == -1)
9725                 return -1;
9726 #endif
9727
9728         if (ipf_main_soft_fini(softc) == -1)
9729                 return -1;
9730
9731         return 0;
9732 }
9733
9734
9735 /* ------------------------------------------------------------------------ */
9736 /* Function:    ipf_rule_expire                                             */
9737 /* Returns:     Nil                                                         */
9738 /* Parameters:  softc(I) - pointer to soft context main structure           */
9739 /*                                                                          */
9740 /* At present this function exists just to support temporary addition of    */
9741 /* firewall rules. Both inactive and active lists are scanned for items to  */
9742 /* purge, as by rights, the expiration is computed as soon as the rule is   */
9743 /* loaded in.                                                               */
9744 /* ------------------------------------------------------------------------ */
9745 void
9746 ipf_rule_expire(softc)
9747         ipf_main_softc_t *softc;
9748 {
9749         frentry_t *fr;
9750
9751         if ((softc->ipf_rule_explist[0] == NULL) &&
9752             (softc->ipf_rule_explist[1] == NULL))
9753                 return;
9754
9755         WRITE_ENTER(&softc->ipf_mutex);
9756
9757         while ((fr = softc->ipf_rule_explist[0]) != NULL) {
9758                 /*
9759                  * Because the list is kept sorted on insertion, the fist
9760                  * one that dies in the future means no more work to do.
9761                  */
9762                 if (fr->fr_die > softc->ipf_ticks)
9763                         break;
9764                 ipf_rule_delete(softc, fr, IPL_LOGIPF, 0);
9765         }
9766
9767         while ((fr = softc->ipf_rule_explist[1]) != NULL) {
9768                 /*
9769                  * Because the list is kept sorted on insertion, the fist
9770                  * one that dies in the future means no more work to do.
9771                  */
9772                 if (fr->fr_die > softc->ipf_ticks)
9773                         break;
9774                 ipf_rule_delete(softc, fr, IPL_LOGIPF, 1);
9775         }
9776
9777         RWLOCK_EXIT(&softc->ipf_mutex);
9778 }
9779
9780
9781 static int ipf_ht_node_cmp __P((struct host_node_s *, struct host_node_s *));
9782 static void ipf_ht_node_make_key __P((host_track_t *, host_node_t *, int,
9783                                       i6addr_t *));
9784
9785 host_node_t RBI_ZERO(ipf_rb);
9786 RBI_CODE(ipf_rb, host_node_t, hn_entry, ipf_ht_node_cmp)
9787
9788
9789 /* ------------------------------------------------------------------------ */
9790 /* Function:    ipf_ht_node_cmp                                             */
9791 /* Returns:     int   - 0 == nodes are the same, ..                         */
9792 /* Parameters:  k1(I) - pointer to first key to compare                     */
9793 /*              k2(I) - pointer to second key to compare                    */
9794 /*                                                                          */
9795 /* The "key" for the node is a combination of two fields: the address       */
9796 /* family and the address itself.                                           */
9797 /*                                                                          */
9798 /* Because we're not actually interpreting the address data, it isn't       */
9799 /* necessary to convert them to/from network/host byte order. The mask is   */
9800 /* just used to remove bits that aren't significant - it doesn't matter     */
9801 /* where they are, as long as they're always in the same place.             */
9802 /*                                                                          */
9803 /* As with IP6_EQ, comparing IPv6 addresses starts at the bottom because    */
9804 /* this is where individual ones will differ the most - but not true for    */
9805 /* for /48's, etc.                                                          */
9806 /* ------------------------------------------------------------------------ */
9807 static int
9808 ipf_ht_node_cmp(k1, k2)
9809         struct host_node_s *k1, *k2;
9810 {
9811         int i;
9812
9813         i = (k2->hn_addr.adf_family - k1->hn_addr.adf_family);
9814         if (i != 0)
9815                 return i;
9816
9817         if (k1->hn_addr.adf_family == AF_INET)
9818                 return (k2->hn_addr.adf_addr.in4.s_addr -
9819                         k1->hn_addr.adf_addr.in4.s_addr);
9820
9821         i = k2->hn_addr.adf_addr.i6[3] - k1->hn_addr.adf_addr.i6[3];
9822         if (i != 0)
9823                 return i;
9824         i = k2->hn_addr.adf_addr.i6[2] - k1->hn_addr.adf_addr.i6[2];
9825         if (i != 0)
9826                 return i;
9827         i = k2->hn_addr.adf_addr.i6[1] - k1->hn_addr.adf_addr.i6[1];
9828         if (i != 0)
9829                 return i;
9830         i = k2->hn_addr.adf_addr.i6[0] - k1->hn_addr.adf_addr.i6[0];
9831         return i;
9832 }
9833
9834
9835 /* ------------------------------------------------------------------------ */
9836 /* Function:    ipf_ht_node_make_key                                        */
9837 /* Returns:     Nil                                                         */
9838 /* parameters:  htp(I)    - pointer to address tracking structure           */
9839 /*              key(I)    - where to store masked address for lookup        */
9840 /*              family(I) - protocol family of address                      */
9841 /*              addr(I)   - pointer to network address                      */
9842 /*                                                                          */
9843 /* Using the "netmask" (number of bits) stored parent host tracking struct, */
9844 /* copy the address passed in into the key structure whilst masking out the */
9845 /* bits that we don't want.                                                 */
9846 /*                                                                          */
9847 /* Because the parser will set ht_netmask to 128 if there is no protocol    */
9848 /* specified (the parser doesn't know if it should be a v4 or v6 rule), we  */
9849 /* have to be wary of that and not allow 32-128 to happen.                  */
9850 /* ------------------------------------------------------------------------ */
9851 static void
9852 ipf_ht_node_make_key(htp, key, family, addr)
9853         host_track_t *htp;
9854         host_node_t *key;
9855         int family;
9856         i6addr_t *addr;
9857 {
9858         key->hn_addr.adf_family = family;
9859         if (family == AF_INET) {
9860                 u_32_t mask;
9861                 int bits;
9862
9863                 key->hn_addr.adf_len = sizeof(key->hn_addr.adf_addr.in4);
9864                 bits = htp->ht_netmask;
9865                 if (bits >= 32) {
9866                         mask = 0xffffffff;
9867                 } else {
9868                         mask = htonl(0xffffffff << (32 - bits));
9869                 }
9870                 key->hn_addr.adf_addr.in4.s_addr = addr->in4.s_addr & mask;
9871 #ifdef USE_INET6
9872         } else {
9873                 int bits = htp->ht_netmask;
9874
9875                 key->hn_addr.adf_len = sizeof(key->hn_addr.adf_addr.in6);
9876                 if (bits > 96) {
9877                         key->hn_addr.adf_addr.i6[3] = addr->i6[3] &
9878                                              htonl(0xffffffff << (128 - bits));
9879                         key->hn_addr.adf_addr.i6[2] = addr->i6[2];
9880                         key->hn_addr.adf_addr.i6[1] = addr->i6[2];
9881                         key->hn_addr.adf_addr.i6[0] = addr->i6[2];
9882                 } else if (bits > 64) {
9883                         key->hn_addr.adf_addr.i6[3] = 0;
9884                         key->hn_addr.adf_addr.i6[2] = addr->i6[2] &
9885                                              htonl(0xffffffff << (96 - bits));
9886                         key->hn_addr.adf_addr.i6[1] = addr->i6[1];
9887                         key->hn_addr.adf_addr.i6[0] = addr->i6[0];
9888                 } else if (bits > 32) {
9889                         key->hn_addr.adf_addr.i6[3] = 0;
9890                         key->hn_addr.adf_addr.i6[2] = 0;
9891                         key->hn_addr.adf_addr.i6[1] = addr->i6[1] &
9892                                              htonl(0xffffffff << (64 - bits));
9893                         key->hn_addr.adf_addr.i6[0] = addr->i6[0];
9894                 } else {
9895                         key->hn_addr.adf_addr.i6[3] = 0;
9896                         key->hn_addr.adf_addr.i6[2] = 0;
9897                         key->hn_addr.adf_addr.i6[1] = 0;
9898                         key->hn_addr.adf_addr.i6[0] = addr->i6[0] &
9899                                              htonl(0xffffffff << (32 - bits));
9900                 }
9901 #endif
9902         }
9903 }
9904
9905
9906 /* ------------------------------------------------------------------------ */
9907 /* Function:    ipf_ht_node_add                                             */
9908 /* Returns:     int       - 0 == success,  -1 == failure                    */
9909 /* Parameters:  softc(I)  - pointer to soft context main structure          */
9910 /*              htp(I)    - pointer to address tracking structure           */
9911 /*              family(I) - protocol family of address                      */
9912 /*              addr(I)   - pointer to network address                      */
9913 /*                                                                          */
9914 /* NOTE: THIS FUNCTION MUST BE CALLED WITH AN EXCLUSIVE LOCK THAT PREVENTS  */
9915 /*       ipf_ht_node_del FROM RUNNING CONCURRENTLY ON THE SAME htp.         */
9916 /*                                                                          */
9917 /* After preparing the key with the address information to find, look in    */
9918 /* the red-black tree to see if the address is known. A successful call to  */
9919 /* this function can mean one of two things: a new node was added to the    */
9920 /* tree or a matching node exists and we're able to bump up its activity.   */
9921 /* ------------------------------------------------------------------------ */
9922 int
9923 ipf_ht_node_add(softc, htp, family, addr)
9924         ipf_main_softc_t *softc;
9925         host_track_t *htp;
9926         int family;
9927         i6addr_t *addr;
9928 {
9929         host_node_t *h;
9930         host_node_t k;
9931
9932         ipf_ht_node_make_key(htp, &k, family, addr);
9933
9934         h = RBI_SEARCH(ipf_rb, &htp->ht_root, &k);
9935         if (h == NULL) {
9936                 if (htp->ht_cur_nodes >= htp->ht_max_nodes)
9937                         return -1;
9938                 KMALLOC(h, host_node_t *);
9939                 if (h == NULL) {
9940                         DT(ipf_rb_no_mem);
9941                         LBUMP(ipf_rb_no_mem);
9942                         return -1;
9943                 }
9944
9945                 /*
9946                  * If there was a macro to initialise the RB node then that
9947                  * would get used here, but there isn't...
9948                  */
9949                 bzero((char *)h, sizeof(*h));
9950                 h->hn_addr = k.hn_addr;
9951                 h->hn_addr.adf_family = k.hn_addr.adf_family;
9952                 RBI_INSERT(ipf_rb, &htp->ht_root, h);
9953                 htp->ht_cur_nodes++;
9954         } else {
9955                 if ((htp->ht_max_per_node != 0) &&
9956                     (h->hn_active >= htp->ht_max_per_node)) {
9957                         DT(ipf_rb_node_max);
9958                         LBUMP(ipf_rb_node_max);
9959                         return -1;
9960                 }
9961         }
9962
9963         h->hn_active++;
9964
9965         return 0;
9966 }
9967
9968
9969 /* ------------------------------------------------------------------------ */
9970 /* Function:    ipf_ht_node_del                                             */
9971 /* Returns:     int       - 0 == success,  -1 == failure                    */
9972 /* parameters:  htp(I)    - pointer to address tracking structure           */
9973 /*              family(I) - protocol family of address                      */
9974 /*              addr(I)   - pointer to network address                      */
9975 /*                                                                          */
9976 /* NOTE: THIS FUNCTION MUST BE CALLED WITH AN EXCLUSIVE LOCK THAT PREVENTS  */
9977 /*       ipf_ht_node_add FROM RUNNING CONCURRENTLY ON THE SAME htp.         */
9978 /*                                                                          */
9979 /* Try and find the address passed in amongst the leavese on this tree to   */
9980 /* be friend. If found then drop the active account for that node drops by  */
9981 /* one. If that count reaches 0, it is time to free it all up.              */
9982 /* ------------------------------------------------------------------------ */
9983 int
9984 ipf_ht_node_del(htp, family, addr)
9985         host_track_t *htp;
9986         int family;
9987         i6addr_t *addr;
9988 {
9989         host_node_t *h;
9990         host_node_t k;
9991
9992         ipf_ht_node_make_key(htp, &k, family, addr);
9993
9994         h = RBI_SEARCH(ipf_rb, &htp->ht_root, &k);
9995         if (h == NULL) {
9996                 return -1;
9997         } else {
9998                 h->hn_active--;
9999                 if (h->hn_active == 0) {
10000                         (void) RBI_DELETE(ipf_rb, &htp->ht_root, h);
10001                         htp->ht_cur_nodes--;
10002                         KFREE(h);
10003                 }
10004         }
10005
10006         return 0;
10007 }
10008
10009
10010 /* ------------------------------------------------------------------------ */
10011 /* Function:    ipf_rb_ht_init                                              */
10012 /* Returns:     Nil                                                         */
10013 /* Parameters:  head(I) - pointer to host tracking structure                */
10014 /*                                                                          */
10015 /* Initialise the host tracking structure to be ready for use above.        */
10016 /* ------------------------------------------------------------------------ */
10017 void
10018 ipf_rb_ht_init(head)
10019         host_track_t *head;
10020 {
10021         RBI_INIT(ipf_rb, &head->ht_root);
10022 }
10023
10024
10025 /* ------------------------------------------------------------------------ */
10026 /* Function:    ipf_rb_ht_freenode                                          */
10027 /* Returns:     Nil                                                         */
10028 /* Parameters:  head(I) - pointer to host tracking structure                */
10029 /*              arg(I)  - additional argument from walk caller              */
10030 /*                                                                          */
10031 /* Free an actual host_node_t structure.                                    */
10032 /* ------------------------------------------------------------------------ */
10033 void
10034 ipf_rb_ht_freenode(node, arg)
10035         host_node_t *node;
10036         void *arg;
10037 {
10038         KFREE(node);
10039 }
10040
10041
10042 /* ------------------------------------------------------------------------ */
10043 /* Function:    ipf_rb_ht_flush                                             */
10044 /* Returns:     Nil                                                         */
10045 /* Parameters:  head(I) - pointer to host tracking structure                */
10046 /*                                                                          */
10047 /* Remove all of the nodes in the tree tracking hosts by calling a walker   */
10048 /* and free'ing each one.                                                   */
10049 /* ------------------------------------------------------------------------ */
10050 void
10051 ipf_rb_ht_flush(head)
10052         host_track_t *head;
10053 {
10054         RBI_WALK(ipf_rb, &head->ht_root, ipf_rb_ht_freenode, NULL);
10055 }
10056
10057
10058 /* ------------------------------------------------------------------------ */
10059 /* Function:    ipf_slowtimer                                               */
10060 /* Returns:     Nil                                                         */
10061 /* Parameters:  ptr(I) - pointer to main ipf soft context structure         */
10062 /*                                                                          */
10063 /* Slowly expire held state for fragments.  Timeouts are set * in           */
10064 /* expectation of this being called twice per second.                       */
10065 /* ------------------------------------------------------------------------ */
10066 void
10067 ipf_slowtimer(softc)
10068         ipf_main_softc_t *softc;
10069 {
10070
10071         ipf_token_expire(softc);
10072         ipf_frag_expire(softc);
10073         ipf_state_expire(softc);
10074         ipf_nat_expire(softc);
10075         ipf_auth_expire(softc);
10076         ipf_lookup_expire(softc);
10077         ipf_rule_expire(softc);
10078         ipf_sync_expire(softc);
10079         softc->ipf_ticks++;
10080 #   if defined(__OpenBSD__)
10081         timeout_add(&ipf_slowtimer_ch, hz/2);
10082 #   endif
10083 }
10084
10085
10086 /* ------------------------------------------------------------------------ */
10087 /* Function:    ipf_inet_mask_add                                           */
10088 /* Returns:     Nil                                                         */
10089 /* Parameters:  bits(I) - pointer to nat context information                */
10090 /*              mtab(I) - pointer to mask hash table structure              */
10091 /*                                                                          */
10092 /* When called, bits represents the mask of a new NAT rule that has just    */
10093 /* been added. This function inserts a bitmask into the array of masks to   */
10094 /* search when searching for a matching NAT rule for a packet.              */
10095 /* Prevention of duplicate masks is achieved by checking the use count for  */
10096 /* a given netmask.                                                         */
10097 /* ------------------------------------------------------------------------ */
10098 void
10099 ipf_inet_mask_add(bits, mtab)
10100         int bits;
10101         ipf_v4_masktab_t *mtab;
10102 {
10103         u_32_t mask;
10104         int i, j;
10105
10106         mtab->imt4_masks[bits]++;
10107         if (mtab->imt4_masks[bits] > 1)
10108                 return;
10109
10110         if (bits == 0)
10111                 mask = 0;
10112         else
10113                 mask = 0xffffffff << (32 - bits);
10114
10115         for (i = 0; i < 33; i++) {
10116                 if (ntohl(mtab->imt4_active[i]) < mask) {
10117                         for (j = 32; j > i; j--)
10118                                 mtab->imt4_active[j] = mtab->imt4_active[j - 1];
10119                         mtab->imt4_active[i] = htonl(mask);
10120                         break;
10121                 }
10122         }
10123         mtab->imt4_max++;
10124 }
10125
10126
10127 /* ------------------------------------------------------------------------ */
10128 /* Function:    ipf_inet_mask_del                                           */
10129 /* Returns:     Nil                                                         */
10130 /* Parameters:  bits(I) - number of bits set in the netmask                 */
10131 /*              mtab(I) - pointer to mask hash table structure              */
10132 /*                                                                          */
10133 /* Remove the 32bit bitmask represented by "bits" from the collection of    */
10134 /* netmasks stored inside of mtab.                                          */
10135 /* ------------------------------------------------------------------------ */
10136 void
10137 ipf_inet_mask_del(bits, mtab)
10138         int bits;
10139         ipf_v4_masktab_t *mtab;
10140 {
10141         u_32_t mask;
10142         int i, j;
10143
10144         mtab->imt4_masks[bits]--;
10145         if (mtab->imt4_masks[bits] > 0)
10146                 return;
10147
10148         mask = htonl(0xffffffff << (32 - bits));
10149         for (i = 0; i < 33; i++) {
10150                 if (mtab->imt4_active[i] == mask) {
10151                         for (j = i + 1; j < 33; j++)
10152                                 mtab->imt4_active[j - 1] = mtab->imt4_active[j];
10153                         break;
10154                 }
10155         }
10156         mtab->imt4_max--;
10157         ASSERT(mtab->imt4_max >= 0);
10158 }
10159
10160
10161 #ifdef USE_INET6
10162 /* ------------------------------------------------------------------------ */
10163 /* Function:    ipf_inet6_mask_add                                          */
10164 /* Returns:     Nil                                                         */
10165 /* Parameters:  bits(I) - number of bits set in mask                        */
10166 /*              mask(I) - pointer to mask to add                            */
10167 /*              mtab(I) - pointer to mask hash table structure              */
10168 /*                                                                          */
10169 /* When called, bitcount represents the mask of a IPv6 NAT map rule that    */
10170 /* has just been added. This function inserts a bitmask into the array of   */
10171 /* masks to search when searching for a matching NAT rule for a packet.     */
10172 /* Prevention of duplicate masks is achieved by checking the use count for  */
10173 /* a given netmask.                                                         */
10174 /* ------------------------------------------------------------------------ */
10175 void
10176 ipf_inet6_mask_add(bits, mask, mtab)
10177         int bits;
10178         i6addr_t *mask;
10179         ipf_v6_masktab_t *mtab;
10180 {
10181         i6addr_t zero;
10182         int i, j;
10183
10184         mtab->imt6_masks[bits]++;
10185         if (mtab->imt6_masks[bits] > 1)
10186                 return;
10187
10188         if (bits == 0) {
10189                 mask = &zero;
10190                 zero.i6[0] = 0;
10191                 zero.i6[1] = 0;
10192                 zero.i6[2] = 0;
10193                 zero.i6[3] = 0;
10194         }
10195
10196         for (i = 0; i < 129; i++) {
10197                 if (IP6_LT(&mtab->imt6_active[i], mask)) {
10198                         for (j = 128; j > i; j--)
10199                                 mtab->imt6_active[j] = mtab->imt6_active[j - 1];
10200                         mtab->imt6_active[i] = *mask;
10201                         break;
10202                 }
10203         }
10204         mtab->imt6_max++;
10205 }
10206
10207
10208 /* ------------------------------------------------------------------------ */
10209 /* Function:    ipf_inet6_mask_del                                          */
10210 /* Returns:     Nil                                                         */
10211 /* Parameters:  bits(I) - number of bits set in mask                        */
10212 /*              mask(I) - pointer to mask to remove                         */
10213 /*              mtab(I) - pointer to mask hash table structure              */
10214 /*                                                                          */
10215 /* Remove the 128bit bitmask represented by "bits" from the collection of   */
10216 /* netmasks stored inside of mtab.                                          */
10217 /* ------------------------------------------------------------------------ */
10218 void
10219 ipf_inet6_mask_del(bits, mask, mtab)
10220         int bits;
10221         i6addr_t *mask;
10222         ipf_v6_masktab_t *mtab;
10223 {
10224         i6addr_t zero;
10225         int i, j;
10226
10227         mtab->imt6_masks[bits]--;
10228         if (mtab->imt6_masks[bits] > 0)
10229                 return;
10230
10231         if (bits == 0)
10232                 mask = &zero;
10233         zero.i6[0] = 0;
10234         zero.i6[1] = 0;
10235         zero.i6[2] = 0;
10236         zero.i6[3] = 0;
10237
10238         for (i = 0; i < 129; i++) {
10239                 if (IP6_EQ(&mtab->imt6_active[i], mask)) {
10240                         for (j = i + 1; j < 129; j++) {
10241                                 mtab->imt6_active[j - 1] = mtab->imt6_active[j];
10242                                 if (IP6_EQ(&mtab->imt6_active[j - 1], &zero))
10243                                         break;
10244                         }
10245                         break;
10246                 }
10247         }
10248         mtab->imt6_max--;
10249         ASSERT(mtab->imt6_max >= 0);
10250 }
10251 #endif