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 #  if !defined(IPFILTER_LKM)
  25 #   include "opt_inet6.h"
  26 #  endif
  27 # include <sys/filio.h>
  28 #else
  29 # include <sys/ioctl.h>
  30 #endif
  31 #if defined(__SVR4) || defined(sun) /* SOLARIS */
  32 # include <sys/filio.h>
  33 #endif
  34 # include <sys/fcntl.h>
  35 #if defined(_KERNEL)
  36 # include <sys/systm.h>
  37 # include <sys/file.h>
  38 #else
  39 # include <stdio.h>
  40 # include <string.h>
  41 # include <stdlib.h>
  42 # include <stddef.h>
  43 # include <sys/file.h>
  44 # define _KERNEL
  45 # include <sys/uio.h>
  46 # undef _KERNEL
  47 #endif
  48 #if !defined(__SVR4)
  49 # include <sys/mbuf.h>
  50 #else
  51 #  include <sys/byteorder.h>
  52 # if (SOLARIS2 < 5) && defined(sun)
  53 #  include <sys/dditypes.h>
  54 # endif
  55 #endif
  56 # include <sys/protosw.h>
  57 #include <sys/socket.h>
  58 #include <net/if.h>
  59 #ifdef sun
  60 # include <net/af.h>
  61 #endif
  62 #include <netinet/in.h>
  63 #include <netinet/in_systm.h>
  64 #include <netinet/ip.h>
  65 #include <netinet/tcp.h>
  66 # include <netinet/udp.h>
  67 # include <netinet/ip_icmp.h>
  68 #include "netinet/ip_compat.h"
  69 #ifdef  USE_INET6
  70 # include <netinet/icmp6.h>
  71 # if !SOLARIS && defined(_KERNEL)
  72 #  include <netinet6/in6_var.h>
  73 # endif
  74 #endif
  75 #include "netinet/ip_fil.h"
  76 #include "netinet/ip_nat.h"
  77 #include "netinet/ip_frag.h"
  78 #include "netinet/ip_state.h"
  79 #include "netinet/ip_proxy.h"
  80 #include "netinet/ip_auth.h"
  81 #ifdef IPFILTER_SCAN
  82 # include "netinet/ip_scan.h"
  83 #endif
  84 #include "netinet/ip_sync.h"
  85 #include "netinet/ip_lookup.h"
  86 #include "netinet/ip_pool.h"
  87 #include "netinet/ip_htable.h"
  88 #ifdef IPFILTER_COMPILED
  89 # include "netinet/ip_rules.h"
  90 #endif
  91 #if defined(IPFILTER_BPF) && defined(_KERNEL)
  92 # include <net/bpf.h>
  93 #endif
  94 #if defined(__FreeBSD_version)
  95 # include <sys/malloc.h>
  96 #endif
  97 #include "netinet/ipl.h"
  98
  99 #if defined(__NetBSD__) && (__NetBSD_Version__ >= 104230000)
 100 # include <sys/callout.h>
 101 extern struct callout ipf_slowtimer_ch;
 102 #endif
 103 /* END OF INCLUDES */
 104
 105 #if !defined(lint)
 106 static const char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-2000 Darren Reed";
 107 static const char rcsid[] = "@(#)$FreeBSD$";
 108 /* static const char rcsid[] = "@(#)$Id: fil.c,v 2.243.2.125 2007/10/10 09:27:20 darrenr Exp $"; */
 109 #endif
 110
 111 #ifndef _KERNEL
 112 # include "ipf.h"
 113 # include "ipt.h"
 114 extern  int     opts;
 115 extern  int     blockreason;
 116 #endif /* _KERNEL */
 117
 118 #define LBUMP(x)        softc->x++
 119 #define LBUMPD(x, y)    do { softc->x.y++; DT(y); } while (0)
 120
 121 static  INLINE int      ipf_check_ipf __P((fr_info_t *, frentry_t *, int));
 122 static  u_32_t          ipf_checkcipso __P((fr_info_t *, u_char *, int));
 123 static  u_32_t          ipf_checkripso __P((u_char *));
 124 static  u_32_t          ipf_decaps __P((fr_info_t *, u_32_t, int));
 125 #ifdef IPFILTER_LOG
 126 static  frentry_t       *ipf_dolog __P((fr_info_t *, u_32_t *));
 127 #endif
 128 static  int             ipf_flushlist __P((ipf_main_softc_t *, int *,
 129                                            frentry_t **));
 130 static  int             ipf_flush_groups __P((ipf_main_softc_t *, frgroup_t **,
 131                                               int));
 132 static  ipfunc_t        ipf_findfunc __P((ipfunc_t));
 133 static  void            *ipf_findlookup __P((ipf_main_softc_t *, int,
 134                                              frentry_t *,
 135                                              i6addr_t *, i6addr_t *));
 136 static  frentry_t       *ipf_firewall __P((fr_info_t *, u_32_t *));
 137 static  int             ipf_fr_matcharray __P((fr_info_t *, int *));
 138 static  int             ipf_frruleiter __P((ipf_main_softc_t *, void *, int,
 139                                             void *));
 140 static  void            ipf_funcfini __P((ipf_main_softc_t *, frentry_t *));
 141 static  int             ipf_funcinit __P((ipf_main_softc_t *, frentry_t *));
 142 static  int             ipf_geniter __P((ipf_main_softc_t *, ipftoken_t *,
 143                                          ipfgeniter_t *));
 144 static  void            ipf_getstat __P((ipf_main_softc_t *,
 145                                          struct friostat *, int));
 146 static  int             ipf_group_flush __P((ipf_main_softc_t *, frgroup_t *));
 147 static  void            ipf_group_free __P((frgroup_t *));
 148 static  int             ipf_grpmapfini __P((struct ipf_main_softc_s *,
 149                                             frentry_t *));
 150 static  int             ipf_grpmapinit __P((struct ipf_main_softc_s *,
 151                                             frentry_t *));
 152 static  frentry_t       *ipf_nextrule __P((ipf_main_softc_t *, int, int,
 153                                            frentry_t *, int));
 154 static  int             ipf_portcheck __P((frpcmp_t *, u_32_t));
 155 static  INLINE int      ipf_pr_ah __P((fr_info_t *));
 156 static  INLINE void     ipf_pr_esp __P((fr_info_t *));
 157 static  INLINE void     ipf_pr_gre __P((fr_info_t *));
 158 static  INLINE void     ipf_pr_udp __P((fr_info_t *));
 159 static  INLINE void     ipf_pr_tcp __P((fr_info_t *));
 160 static  INLINE void     ipf_pr_icmp __P((fr_info_t *));
 161 static  INLINE void     ipf_pr_ipv4hdr __P((fr_info_t *));
 162 static  INLINE void     ipf_pr_short __P((fr_info_t *, int));
 163 static  INLINE int      ipf_pr_tcpcommon __P((fr_info_t *));
 164 static  INLINE int      ipf_pr_udpcommon __P((fr_info_t *));
 165 static  void            ipf_rule_delete __P((ipf_main_softc_t *, frentry_t *f,
 166                                              int, int));
 167 static  void            ipf_rule_expire_insert __P((ipf_main_softc_t *,
 168                                                     frentry_t *, int));
 169 static  int             ipf_synclist __P((ipf_main_softc_t *, frentry_t *,
 170                                           void *));
 171 static  void            ipf_token_flush __P((ipf_main_softc_t *));
 172 static  void            ipf_token_unlink __P((ipf_main_softc_t *,
 173                                               ipftoken_t *));
 174 static  ipftuneable_t   *ipf_tune_findbyname __P((ipftuneable_t *,
 175                                                   const char *));
 176 static  ipftuneable_t   *ipf_tune_findbycookie __P((ipftuneable_t **, void *,
 177                                                     void **));
 178 static  int             ipf_updateipid __P((fr_info_t *));
 179 static  int             ipf_settimeout __P((struct ipf_main_softc_s *,
 180                                             struct ipftuneable *,
 181                                             ipftuneval_t *));
 182 #if !defined(_KERNEL) || SOLARIS
 183 static  int             ppsratecheck(struct timeval *, int *, int);
 184 #endif
 185
 186
 187 /*
 188  * bit values for identifying presence of individual IP options
 189  * All of these tables should be ordered by increasing key value on the left
 190  * hand side to allow for binary searching of the array and include a trailer
 191  * with a 0 for the bitmask for linear searches to easily find the end with.
 192  */
 193 static const    struct  optlist ipopts[20] = {
 194         { IPOPT_NOP,    0x000001 },
 195         { IPOPT_RR,     0x000002 },
 196         { IPOPT_ZSU,    0x000004 },
 197         { IPOPT_MTUP,   0x000008 },
 198         { IPOPT_MTUR,   0x000010 },
 199         { IPOPT_ENCODE, 0x000020 },
 200         { IPOPT_TS,     0x000040 },
 201         { IPOPT_TR,     0x000080 },
 202         { IPOPT_SECURITY, 0x000100 },
 203         { IPOPT_LSRR,   0x000200 },
 204         { IPOPT_E_SEC,  0x000400 },
 205         { IPOPT_CIPSO,  0x000800 },
 206         { IPOPT_SATID,  0x001000 },
 207         { IPOPT_SSRR,   0x002000 },
 208         { IPOPT_ADDEXT, 0x004000 },
 209         { IPOPT_VISA,   0x008000 },
 210         { IPOPT_IMITD,  0x010000 },
 211         { IPOPT_EIP,    0x020000 },
 212         { IPOPT_FINN,   0x040000 },
 213         { 0,            0x000000 }
 214 };
 215
 216 #ifdef USE_INET6
 217 static const struct optlist ip6exthdr[] = {
 218         { IPPROTO_HOPOPTS,              0x000001 },
 219         { IPPROTO_IPV6,                 0x000002 },
 220         { IPPROTO_ROUTING,              0x000004 },
 221         { IPPROTO_FRAGMENT,             0x000008 },
 222         { IPPROTO_ESP,                  0x000010 },
 223         { IPPROTO_AH,                   0x000020 },
 224         { IPPROTO_NONE,                 0x000040 },
 225         { IPPROTO_DSTOPTS,              0x000080 },
 226         { IPPROTO_MOBILITY,             0x000100 },
 227         { 0,                            0 }
 228 };
 229 #endif
 230
 231 /*
 232  * bit values for identifying presence of individual IP security options
 233  */
 234 static const    struct  optlist secopt[8] = {
 235         { IPSO_CLASS_RES4,      0x01 },
 236         { IPSO_CLASS_TOPS,      0x02 },
 237         { IPSO_CLASS_SECR,      0x04 },
 238         { IPSO_CLASS_RES3,      0x08 },
 239         { IPSO_CLASS_CONF,      0x10 },
 240         { IPSO_CLASS_UNCL,      0x20 },
 241         { IPSO_CLASS_RES2,      0x40 },
 242         { IPSO_CLASS_RES1,      0x80 }
 243 };
 244
 245 char    ipfilter_version[] = IPL_VERSION;
 246
 247 int     ipf_features = 0
 248 #ifdef  IPFILTER_LKM
 249                 | IPF_FEAT_LKM
 250 #endif
 251 #ifdef  IPFILTER_LOG
 252                 | IPF_FEAT_LOG
 253 #endif
 254                 | IPF_FEAT_LOOKUP
 255 #ifdef  IPFILTER_BPF
 256                 | IPF_FEAT_BPF
 257 #endif
 258 #ifdef  IPFILTER_COMPILED
 259                 | IPF_FEAT_COMPILED
 260 #endif
 261 #ifdef  IPFILTER_CKSUM
 262                 | IPF_FEAT_CKSUM
 263 #endif
 264                 | IPF_FEAT_SYNC
 265 #ifdef  IPFILTER_SCAN
 266                 | IPF_FEAT_SCAN
 267 #endif
 268 #ifdef  USE_INET6
 269                 | IPF_FEAT_IPV6
 270 #endif
 271         ;
 272
 273
 274 /*
 275  * Table of functions available for use with call rules.
 276  */
 277 static ipfunc_resolve_t ipf_availfuncs[] = {
 278         { "srcgrpmap", ipf_srcgrpmap, ipf_grpmapinit, ipf_grpmapfini },
 279         { "dstgrpmap", ipf_dstgrpmap, ipf_grpmapinit, ipf_grpmapfini },
 280         { "",         NULL,           NULL,           NULL }
 281 };
 282
 283 static ipftuneable_t ipf_main_tuneables[] = {
 284         { { (void *)offsetof(struct ipf_main_softc_s, ipf_flags) },
 285                 "ipf_flags",            0,      0xffffffff,
 286                 stsizeof(ipf_main_softc_t, ipf_flags),
 287                 0,                      NULL,   NULL },
 288         { { (void *)offsetof(struct ipf_main_softc_s, ipf_active) },
 289                 "active",               0,      0,
 290                 stsizeof(ipf_main_softc_t, ipf_active),
 291                 IPFT_RDONLY,            NULL,   NULL },
 292         { { (void *)offsetof(ipf_main_softc_t, ipf_control_forwarding) },
 293                 "control_forwarding",   0, 1,
 294                 stsizeof(ipf_main_softc_t, ipf_control_forwarding),
 295                 0,                      NULL,   NULL },
 296         { { (void *)offsetof(ipf_main_softc_t, ipf_update_ipid) },
 297                 "update_ipid",          0,      1,
 298                 stsizeof(ipf_main_softc_t, ipf_update_ipid),
 299                 0,                      NULL,   NULL },
 300         { { (void *)offsetof(ipf_main_softc_t, ipf_chksrc) },
 301                 "chksrc",               0,      1,
 302                 stsizeof(ipf_main_softc_t, ipf_chksrc),
 303                 0,                      NULL,   NULL },
 304         { { (void *)offsetof(ipf_main_softc_t, ipf_minttl) },
 305                 "min_ttl",              0,      1,
 306                 stsizeof(ipf_main_softc_t, ipf_minttl),
 307                 0,                      NULL,   NULL },
 308         { { (void *)offsetof(ipf_main_softc_t, ipf_icmpminfragmtu) },
 309                 "icmp_minfragmtu",      0,      1,
 310                 stsizeof(ipf_main_softc_t, ipf_icmpminfragmtu),
 311                 0,                      NULL,   NULL },
 312         { { (void *)offsetof(ipf_main_softc_t, ipf_pass) },
 313                 "default_pass",         0,      0xffffffff,
 314                 stsizeof(ipf_main_softc_t, ipf_pass),
 315                 0,                      NULL,   NULL },
 316         { { (void *)offsetof(ipf_main_softc_t, ipf_tcpidletimeout) },
 317                 "tcp_idle_timeout",     1,      0x7fffffff,
 318                 stsizeof(ipf_main_softc_t, ipf_tcpidletimeout),
 319                 0,                      NULL,   ipf_settimeout },
 320         { { (void *)offsetof(ipf_main_softc_t, ipf_tcpclosewait) },
 321                 "tcp_close_wait",       1,      0x7fffffff,
 322                 stsizeof(ipf_main_softc_t, ipf_tcpclosewait),
 323                 0,                      NULL,   ipf_settimeout },
 324         { { (void *)offsetof(ipf_main_softc_t, ipf_tcplastack) },
 325                 "tcp_last_ack",         1,      0x7fffffff,
 326                 stsizeof(ipf_main_softc_t, ipf_tcplastack),
 327                 0,                      NULL,   ipf_settimeout },
 328         { { (void *)offsetof(ipf_main_softc_t, ipf_tcptimeout) },
 329                 "tcp_timeout",          1,      0x7fffffff,
 330                 stsizeof(ipf_main_softc_t, ipf_tcptimeout),
 331                 0,                      NULL,   ipf_settimeout },
 332         { { (void *)offsetof(ipf_main_softc_t, ipf_tcpsynsent) },
 333                 "tcp_syn_sent",         1,      0x7fffffff,
 334                 stsizeof(ipf_main_softc_t, ipf_tcpsynsent),
 335                 0,                      NULL,   ipf_settimeout },
 336         { { (void *)offsetof(ipf_main_softc_t, ipf_tcpsynrecv) },
 337                 "tcp_syn_received",     1,      0x7fffffff,
 338                 stsizeof(ipf_main_softc_t, ipf_tcpsynrecv),
 339                 0,                      NULL,   ipf_settimeout },
 340         { { (void *)offsetof(ipf_main_softc_t, ipf_tcpclosed) },
 341                 "tcp_closed",           1,      0x7fffffff,
 342                 stsizeof(ipf_main_softc_t, ipf_tcpclosed),
 343                 0,                      NULL,   ipf_settimeout },
 344         { { (void *)offsetof(ipf_main_softc_t, ipf_tcphalfclosed) },
 345                 "tcp_half_closed",      1,      0x7fffffff,
 346                 stsizeof(ipf_main_softc_t, ipf_tcphalfclosed),
 347                 0,                      NULL,   ipf_settimeout },
 348         { { (void *)offsetof(ipf_main_softc_t, ipf_tcptimewait) },
 349                 "tcp_time_wait",        1,      0x7fffffff,
 350                 stsizeof(ipf_main_softc_t, ipf_tcptimewait),
 351                 0,                      NULL,   ipf_settimeout },
 352         { { (void *)offsetof(ipf_main_softc_t, ipf_udptimeout) },
 353                 "udp_timeout",          1,      0x7fffffff,
 354                 stsizeof(ipf_main_softc_t, ipf_udptimeout),
 355                 0,                      NULL,   ipf_settimeout },
 356         { { (void *)offsetof(ipf_main_softc_t, ipf_udpacktimeout) },
 357                 "udp_ack_timeout",      1,      0x7fffffff,
 358                 stsizeof(ipf_main_softc_t, ipf_udpacktimeout),
 359                 0,                      NULL,   ipf_settimeout },
 360         { { (void *)offsetof(ipf_main_softc_t, ipf_icmptimeout) },
 361                 "icmp_timeout",         1,      0x7fffffff,
 362                 stsizeof(ipf_main_softc_t, ipf_icmptimeout),
 363                 0,                      NULL,   ipf_settimeout },
 364         { { (void *)offsetof(ipf_main_softc_t, ipf_icmpacktimeout) },
 365                 "icmp_ack_timeout",     1,      0x7fffffff,
 366                 stsizeof(ipf_main_softc_t, ipf_icmpacktimeout),
 367                 0,                      NULL,   ipf_settimeout },
 368         { { (void *)offsetof(ipf_main_softc_t, ipf_iptimeout) },
 369                 "ip_timeout",           1,      0x7fffffff,
 370                 stsizeof(ipf_main_softc_t, ipf_iptimeout),
 371                 0,                      NULL,   ipf_settimeout },
 372 #if defined(INSTANCES) && defined(_KERNEL)
 373         { { (void *)offsetof(ipf_main_softc_t, ipf_get_loopback) },
 374                 "intercept_loopback",   0,      1,
 375                 stsizeof(ipf_main_softc_t, ipf_get_loopback),
 376                 0,                      NULL,   ipf_set_loopback },
 377 #endif
 378         { { 0 },
 379                 NULL,                   0,      0,
 380                 0,
 381                 0,                      NULL,   NULL }
 382 };
 383
 384
 385 /*
 386  * The next section of code is a collection of small routines that set
 387  * fields in the fr_info_t structure passed based on properties of the
 388  * current packet.  There are different routines for the same protocol
 389  * for each of IPv4 and IPv6.  Adding a new protocol, for which there
 390  * will "special" inspection for setup, is now more easily done by adding
 391  * a new routine and expanding the ipf_pr_ipinit*() function rather than by
 392  * adding more code to a growing switch statement.
 393  */
 394 #ifdef USE_INET6
 395 static  INLINE int      ipf_pr_ah6 __P((fr_info_t *));
 396 static  INLINE void     ipf_pr_esp6 __P((fr_info_t *));
 397 static  INLINE void     ipf_pr_gre6 __P((fr_info_t *));
 398 static  INLINE void     ipf_pr_udp6 __P((fr_info_t *));
 399 static  INLINE void     ipf_pr_tcp6 __P((fr_info_t *));
 400 static  INLINE void     ipf_pr_icmp6 __P((fr_info_t *));
 401 static  INLINE void     ipf_pr_ipv6hdr __P((fr_info_t *));
 402 static  INLINE void     ipf_pr_short6 __P((fr_info_t *, int));
 403 static  INLINE int      ipf_pr_hopopts6 __P((fr_info_t *));
 404 static  INLINE int      ipf_pr_mobility6 __P((fr_info_t *));
 405 static  INLINE int      ipf_pr_routing6 __P((fr_info_t *));
 406 static  INLINE int      ipf_pr_dstopts6 __P((fr_info_t *));
 407 static  INLINE int      ipf_pr_fragment6 __P((fr_info_t *));
 408 static  INLINE struct ip6_ext *ipf_pr_ipv6exthdr __P((fr_info_t *, int, int));
 409
 410
 411 /* ------------------------------------------------------------------------ */
 412 /* Function:    ipf_pr_short6                                               */
 413 /* Returns:     void                                                        */
 414 /* Parameters:  fin(I)  - pointer to packet information                     */
 415 /*              xmin(I) - minimum header size                               */
 416 /*                                                                          */
 417 /* IPv6 Only                                                                */
 418 /* This is function enforces the 'is a packet too short to be legit' rule   */
 419 /* for IPv6 and marks the packet with FI_SHORT if so.  See function comment */
 420 /* for ipf_pr_short() for more details.                                     */
 421 /* ------------------------------------------------------------------------ */
 422 static INLINE void
 423 ipf_pr_short6(fin, xmin)
 424         fr_info_t *fin;
 425         int xmin;
 426 {
 427
 428         if (fin->fin_dlen < xmin)
 429                 fin->fin_flx |= FI_SHORT;
 430 }
 431
 432
 433 /* ------------------------------------------------------------------------ */
 434 /* Function:    ipf_pr_ipv6hdr                                              */
 435 /* Returns:     void                                                        */
 436 /* Parameters:  fin(I) - pointer to packet information                      */
 437 /*                                                                          */
 438 /* IPv6 Only                                                                */
 439 /* Copy values from the IPv6 header into the fr_info_t struct and call the  */
 440 /* per-protocol analyzer if it exists.  In validating the packet, a protocol*/
 441 /* analyzer may pullup or free the packet itself so we need to be vigiliant */
 442 /* of that possibility arising.                                             */
 443 /* ------------------------------------------------------------------------ */
 444 static INLINE void
 445 ipf_pr_ipv6hdr(fin)
 446         fr_info_t *fin;
 447 {
 448         ip6_t *ip6 = (ip6_t *)fin->fin_ip;
 449         int p, go = 1, i, hdrcount;
 450         fr_ip_t *fi = &fin->fin_fi;
 451
 452         fin->fin_off = 0;
 453
 454         fi->fi_tos = 0;
 455         fi->fi_optmsk = 0;
 456         fi->fi_secmsk = 0;
 457         fi->fi_auth = 0;
 458
 459         p = ip6->ip6_nxt;
 460         fin->fin_crc = p;
 461         fi->fi_ttl = ip6->ip6_hlim;
 462         fi->fi_src.in6 = ip6->ip6_src;
 463         fin->fin_crc += fi->fi_src.i6[0];
 464         fin->fin_crc += fi->fi_src.i6[1];
 465         fin->fin_crc += fi->fi_src.i6[2];
 466         fin->fin_crc += fi->fi_src.i6[3];
 467         fi->fi_dst.in6 = ip6->ip6_dst;
 468         fin->fin_crc += fi->fi_dst.i6[0];
 469         fin->fin_crc += fi->fi_dst.i6[1];
 470         fin->fin_crc += fi->fi_dst.i6[2];
 471         fin->fin_crc += fi->fi_dst.i6[3];
 472         fin->fin_id = 0;
 473         if (IN6_IS_ADDR_MULTICAST(&fi->fi_dst.in6))
 474                 fin->fin_flx |= FI_MULTICAST|FI_MBCAST;
 475
 476         hdrcount = 0;
 477         while (go && !(fin->fin_flx & FI_SHORT)) {
 478                 switch (p)
 479                 {
 480                 case IPPROTO_UDP :
 481                         ipf_pr_udp6(fin);
 482                         go = 0;
 483                         break;
 484
 485                 case IPPROTO_TCP :
 486                         ipf_pr_tcp6(fin);
 487                         go = 0;
 488                         break;
 489
 490                 case IPPROTO_ICMPV6 :
 491                         ipf_pr_icmp6(fin);
 492                         go = 0;
 493                         break;
 494
 495                 case IPPROTO_GRE :
 496                         ipf_pr_gre6(fin);
 497                         go = 0;
 498                         break;
 499
 500                 case IPPROTO_HOPOPTS :
 501                         p = ipf_pr_hopopts6(fin);
 502                         break;
 503
 504                 case IPPROTO_MOBILITY :
 505                         p = ipf_pr_mobility6(fin);
 506                         break;
 507
 508                 case IPPROTO_DSTOPTS :
 509                         p = ipf_pr_dstopts6(fin);
 510                         break;
 511
 512                 case IPPROTO_ROUTING :
 513                         p = ipf_pr_routing6(fin);
 514                         break;
 515
 516                 case IPPROTO_AH :
 517                         p = ipf_pr_ah6(fin);
 518                         break;
 519
 520                 case IPPROTO_ESP :
 521                         ipf_pr_esp6(fin);
 522                         go = 0;
 523                         break;
 524
 525                 case IPPROTO_IPV6 :
 526                         for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
 527                                 if (ip6exthdr[i].ol_val == p) {
 528                                         fin->fin_flx |= ip6exthdr[i].ol_bit;
 529                                         break;
 530                                 }
 531                         go = 0;
 532                         break;
 533
 534                 case IPPROTO_NONE :
 535                         go = 0;
 536                         break;
 537
 538                 case IPPROTO_FRAGMENT :
 539                         p = ipf_pr_fragment6(fin);
 540                         /*
 541                          * Given that the only fragments we want to let through
 542                          * (where fin_off != 0) are those where the non-first
 543                          * fragments only have data, we can safely stop looking
 544                          * at headers if this is a non-leading fragment.
 545                          */
 546                         if (fin->fin_off != 0)
 547                                 go = 0;
 548                         break;
 549
 550                 default :
 551                         go = 0;
 552                         break;
 553                 }
 554                 hdrcount++;
 555
 556                 /*
 557                  * It is important to note that at this point, for the
 558                  * extension headers (go != 0), the entire header may not have
 559                  * been pulled up when the code gets to this point.  This is
 560                  * only done for "go != 0" because the other header handlers
 561                  * will all pullup their complete header.  The other indicator
 562                  * of an incomplete packet is that this was just an extension
 563                  * header.
 564                  */
 565                 if ((go != 0) && (p != IPPROTO_NONE) &&
 566                     (ipf_pr_pullup(fin, 0) == -1)) {
 567                         p = IPPROTO_NONE;
 568                         break;
 569                 }
 570         }
 571
 572         /*
 573          * Some of the above functions, like ipf_pr_esp6(), can call ipf_pullup
 574          * and destroy whatever packet was here.  The caller of this function
 575          * expects us to return if there is a problem with ipf_pullup.
 576          */
 577         if (fin->fin_m == NULL) {
 578                 ipf_main_softc_t *softc = fin->fin_main_soft;
 579
 580                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_bad);
 581                 return;
 582         }
 583
 584         fi->fi_p = p;
 585
 586         /*
 587          * IPv6 fragment case 1 - see comment for ipf_pr_fragment6().
 588          * "go != 0" imples the above loop hasn't arrived at a layer 4 header.
 589          */
 590         if ((go != 0) && (fin->fin_flx & FI_FRAG) && (fin->fin_off == 0)) {
 591                 ipf_main_softc_t *softc = fin->fin_main_soft;
 592
 593                 fin->fin_flx |= FI_BAD;
 594                 DT2(ipf_fi_bad_ipv6_frag_1, fr_info_t *, fin, int, go);
 595                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_badfrag);
 596                 LBUMP(ipf_stats[fin->fin_out].fr_v6_bad);
 597         }
 598 }
 599
 600
 601 /* ------------------------------------------------------------------------ */
 602 /* Function:    ipf_pr_ipv6exthdr                                           */
 603 /* Returns:     struct ip6_ext * - pointer to the start of the next header  */
 604 /*                                 or NULL if there is a prolblem.          */
 605 /* Parameters:  fin(I)      - pointer to packet information                 */
 606 /*              multiple(I) - flag indicating yes/no if multiple occurances */
 607 /*                            of this extension header are allowed.         */
 608 /*              proto(I)    - protocol number for this extension header     */
 609 /*                                                                          */
 610 /* IPv6 Only                                                                */
 611 /* This function embodies a number of common checks that all IPv6 extension */
 612 /* headers must be subjected to.  For example, making sure the packet is    */
 613 /* big enough for it to be in, checking if it is repeated and setting a     */
 614 /* flag to indicate its presence.                                           */
 615 /* ------------------------------------------------------------------------ */
 616 static INLINE struct ip6_ext *
 617 ipf_pr_ipv6exthdr(fin, multiple, proto)
 618         fr_info_t *fin;
 619         int multiple, proto;
 620 {
 621         ipf_main_softc_t *softc = fin->fin_main_soft;
 622         struct ip6_ext *hdr;
 623         u_short shift;
 624         int i;
 625
 626         fin->fin_flx |= FI_V6EXTHDR;
 627
 628                                 /* 8 is default length of extension hdr */
 629         if ((fin->fin_dlen - 8) < 0) {
 630                 fin->fin_flx |= FI_SHORT;
 631                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_short);
 632                 return NULL;
 633         }
 634
 635         if (ipf_pr_pullup(fin, 8) == -1) {
 636                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_pullup);
 637                 return NULL;
 638         }
 639
 640         hdr = fin->fin_dp;
 641         switch (proto)
 642         {
 643         case IPPROTO_FRAGMENT :
 644                 shift = 8;
 645                 break;
 646         default :
 647                 shift = 8 + (hdr->ip6e_len << 3);
 648                 break;
 649         }
 650
 651         if (shift > fin->fin_dlen) {    /* Nasty extension header length? */
 652                 fin->fin_flx |= FI_BAD;
 653                 DT3(ipf_fi_bad_pr_ipv6exthdr_len, fr_info_t *, fin, u_short, shift, u_short, fin->fin_dlen);
 654                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_hlen);
 655                 return NULL;
 656         }
 657
 658         fin->fin_dp = (char *)fin->fin_dp + shift;
 659         fin->fin_dlen -= shift;
 660
 661         /*
 662          * If we have seen a fragment header, do not set any flags to indicate
 663          * the presence of this extension header as it has no impact on the
 664          * end result until after it has been defragmented.
 665          */
 666         if (fin->fin_flx & FI_FRAG)
 667                 return hdr;
 668
 669         for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
 670                 if (ip6exthdr[i].ol_val == proto) {
 671                         /*
 672                          * Most IPv6 extension headers are only allowed once.
 673                          */
 674                         if ((multiple == 0) &&
 675                             ((fin->fin_optmsk & ip6exthdr[i].ol_bit) != 0)) {
 676                                 fin->fin_flx |= FI_BAD;
 677                                 DT2(ipf_fi_bad_ipv6exthdr_once, fr_info_t *, fin, u_int, (fin->fin_optmsk & ip6exthdr[i].ol_bit));
 678                         } else
 679                                 fin->fin_optmsk |= ip6exthdr[i].ol_bit;
 680                         break;
 681                 }
 682
 683         return hdr;
 684 }
 685
 686
 687 /* ------------------------------------------------------------------------ */
 688 /* Function:    ipf_pr_hopopts6                                             */
 689 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 690 /* Parameters:  fin(I) - pointer to packet information                      */
 691 /*                                                                          */
 692 /* IPv6 Only                                                                */
 693 /* This is function checks pending hop by hop options extension header      */
 694 /* ------------------------------------------------------------------------ */
 695 static INLINE int
 696 ipf_pr_hopopts6(fin)
 697         fr_info_t *fin;
 698 {
 699         struct ip6_ext *hdr;
 700
 701         hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_HOPOPTS);
 702         if (hdr == NULL)
 703                 return IPPROTO_NONE;
 704         return hdr->ip6e_nxt;
 705 }
 706
 707
 708 /* ------------------------------------------------------------------------ */
 709 /* Function:    ipf_pr_mobility6                                            */
 710 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 711 /* Parameters:  fin(I) - pointer to packet information                      */
 712 /*                                                                          */
 713 /* IPv6 Only                                                                */
 714 /* This is function checks the IPv6 mobility extension header               */
 715 /* ------------------------------------------------------------------------ */
 716 static INLINE int
 717 ipf_pr_mobility6(fin)
 718         fr_info_t *fin;
 719 {
 720         struct ip6_ext *hdr;
 721
 722         hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_MOBILITY);
 723         if (hdr == NULL)
 724                 return IPPROTO_NONE;
 725         return hdr->ip6e_nxt;
 726 }
 727
 728
 729 /* ------------------------------------------------------------------------ */
 730 /* Function:    ipf_pr_routing6                                             */
 731 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 732 /* Parameters:  fin(I) - pointer to packet information                      */
 733 /*                                                                          */
 734 /* IPv6 Only                                                                */
 735 /* This is function checks pending routing extension header                 */
 736 /* ------------------------------------------------------------------------ */
 737 static INLINE int
 738 ipf_pr_routing6(fin)
 739         fr_info_t *fin;
 740 {
 741         struct ip6_routing *hdr;
 742
 743         hdr = (struct ip6_routing *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_ROUTING);
 744         if (hdr == NULL)
 745                 return IPPROTO_NONE;
 746
 747         switch (hdr->ip6r_type)
 748         {
 749         case 0 :
 750                 /*
 751                  * Nasty extension header length?
 752                  */
 753                 if (((hdr->ip6r_len >> 1) < hdr->ip6r_segleft) ||
 754                     (hdr->ip6r_segleft && (hdr->ip6r_len & 1))) {
 755                         ipf_main_softc_t *softc = fin->fin_main_soft;
 756
 757                         fin->fin_flx |= FI_BAD;
 758                         DT1(ipf_fi_bad_routing6, fr_info_t *, fin);
 759                         LBUMPD(ipf_stats[fin->fin_out], fr_v6_rh_bad);
 760                         return IPPROTO_NONE;
 761                 }
 762                 break;
 763
 764         default :
 765                 break;
 766         }
 767
 768         return hdr->ip6r_nxt;
 769 }
 770
 771
 772 /* ------------------------------------------------------------------------ */
 773 /* Function:    ipf_pr_fragment6                                            */
 774 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 775 /* Parameters:  fin(I) - pointer to packet information                      */
 776 /*                                                                          */
 777 /* IPv6 Only                                                                */
 778 /* Examine the IPv6 fragment header and extract fragment offset information.*/
 779 /*                                                                          */
 780 /* Fragments in IPv6 are extraordinarily difficult to deal with - much more */
 781 /* so than in IPv4.  There are 5 cases of fragments with IPv6 that all      */
 782 /* packets with a fragment header can fit into.  They are as follows:       */
 783 /*                                                                          */
 784 /* 1.  [IPv6][0-n EH][FH][0-n EH] (no L4HDR present)                        */
 785 /* 2.  [IPV6][0-n EH][FH][0-n EH][L4HDR part] (short)                       */
 786 /* 3.  [IPV6][0-n EH][FH][L4HDR part][0-n data] (short)                     */
 787 /* 4.  [IPV6][0-n EH][FH][0-n EH][L4HDR][0-n data]                          */
 788 /* 5.  [IPV6][0-n EH][FH][data]                                             */
 789 /*                                                                          */
 790 /* IPV6 = IPv6 header, FH = Fragment Header,                                */
 791 /* 0-n EH = 0 or more extension headers, 0-n data = 0 or more bytes of data */
 792 /*                                                                          */
 793 /* Packets that match 1, 2, 3 will be dropped as the only reasonable        */
 794 /* scenario in which they happen is in extreme circumstances that are most  */
 795 /* likely to be an indication of an attack rather than normal traffic.      */
 796 /* A type 3 packet may be sent by an attacked after a type 4 packet.  There */
 797 /* are two rules that can be used to guard against type 3 packets: L4       */
 798 /* headers must always be in a packet that has the offset field set to 0    */
 799 /* and no packet is allowed to overlay that where offset = 0.               */
 800 /* ------------------------------------------------------------------------ */
 801 static INLINE int
 802 ipf_pr_fragment6(fin)
 803         fr_info_t *fin;
 804 {
 805         ipf_main_softc_t *softc = fin->fin_main_soft;
 806         struct ip6_frag *frag;
 807
 808         fin->fin_flx |= FI_FRAG;
 809
 810         frag = (struct ip6_frag *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_FRAGMENT);
 811         if (frag == NULL) {
 812                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_frag_bad);
 813                 return IPPROTO_NONE;
 814         }
 815
 816         if ((frag->ip6f_offlg & IP6F_MORE_FRAG) != 0) {
 817                 /*
 818                  * Any fragment that isn't the last fragment must have its
 819                  * length as a multiple of 8.
 820                  */
 821                 if ((fin->fin_plen & 7) != 0) {
 822                         fin->fin_flx |= FI_BAD;
 823                         DT2(ipf_fi_bad_frag_not_8, fr_info_t *, fin, u_int, (fin->fin_plen & 7));
 824                 }
 825         }
 826
 827         fin->fin_fraghdr = frag;
 828         fin->fin_id = frag->ip6f_ident;
 829         fin->fin_off = ntohs(frag->ip6f_offlg & IP6F_OFF_MASK);
 830         if (fin->fin_off != 0)
 831                 fin->fin_flx |= FI_FRAGBODY;
 832
 833         /*
 834          * Jumbograms aren't handled, so the max. length is 64k
 835          */
 836         if ((fin->fin_off << 3) + fin->fin_dlen > 65535) {
 837                   fin->fin_flx |= FI_BAD;
 838                   DT2(ipf_fi_bad_jumbogram, fr_info_t *, fin, u_int, ((fin->fin_off << 3) + fin->fin_dlen));
 839         }
 840
 841         /*
 842          * We don't know where the transport layer header (or whatever is next
 843          * is), as it could be behind destination options (amongst others) so
 844          * return the fragment header as the type of packet this is.  Note that
 845          * this effectively disables the fragment cache for > 1 protocol at a
 846          * time.
 847          */
 848         return frag->ip6f_nxt;
 849 }
 850
 851
 852 /* ------------------------------------------------------------------------ */
 853 /* Function:    ipf_pr_dstopts6                                             */
 854 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
 855 /* Parameters:  fin(I) - pointer to packet information                      */
 856 /*                                                                          */
 857 /* IPv6 Only                                                                */
 858 /* This is function checks pending destination options extension header     */
 859 /* ------------------------------------------------------------------------ */
 860 static INLINE int
 861 ipf_pr_dstopts6(fin)
 862         fr_info_t *fin;
 863 {
 864         ipf_main_softc_t *softc = fin->fin_main_soft;
 865         struct ip6_ext *hdr;
 866
 867         hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_DSTOPTS);
 868         if (hdr == NULL) {
 869                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_dst_bad);
 870                 return IPPROTO_NONE;
 871         }
 872         return hdr->ip6e_nxt;
 873 }
 874
 875
 876 /* ------------------------------------------------------------------------ */
 877 /* Function:    ipf_pr_icmp6                                                */
 878 /* Returns:     void                                                        */
 879 /* Parameters:  fin(I) - pointer to packet information                      */
 880 /*                                                                          */
 881 /* IPv6 Only                                                                */
 882 /* This routine is mainly concerned with determining the minimum valid size */
 883 /* for an ICMPv6 packet.                                                    */
 884 /* ------------------------------------------------------------------------ */
 885 static INLINE void
 886 ipf_pr_icmp6(fin)
 887         fr_info_t *fin;
 888 {
 889         int minicmpsz = sizeof(struct icmp6_hdr);
 890         struct icmp6_hdr *icmp6;
 891
 892         if (ipf_pr_pullup(fin, ICMP6ERR_MINPKTLEN - sizeof(ip6_t)) == -1) {
 893                 ipf_main_softc_t *softc = fin->fin_main_soft;
 894
 895                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_icmp6_pullup);
 896                 return;
 897         }
 898
 899         if (fin->fin_dlen > 1) {
 900                 ip6_t *ip6;
 901
 902                 icmp6 = fin->fin_dp;
 903
 904                 fin->fin_data[0] = *(u_short *)icmp6;
 905
 906                 if ((icmp6->icmp6_type & ICMP6_INFOMSG_MASK) != 0)
 907                         fin->fin_flx |= FI_ICMPQUERY;
 908
 909                 switch (icmp6->icmp6_type)
 910                 {
 911                 case ICMP6_ECHO_REPLY :
 912                 case ICMP6_ECHO_REQUEST :
 913                         if (fin->fin_dlen >= 6)
 914                                 fin->fin_data[1] = icmp6->icmp6_id;
 915                         minicmpsz = ICMP6ERR_MINPKTLEN - sizeof(ip6_t);
 916                         break;
 917
 918                 case ICMP6_DST_UNREACH :
 919                 case ICMP6_PACKET_TOO_BIG :
 920                 case ICMP6_TIME_EXCEEDED :
 921                 case ICMP6_PARAM_PROB :
 922                         fin->fin_flx |= FI_ICMPERR;
 923                         minicmpsz = ICMP6ERR_IPICMPHLEN - sizeof(ip6_t);
 924                         if (fin->fin_plen < ICMP6ERR_IPICMPHLEN)
 925                                 break;
 926
 927                         if (M_LEN(fin->fin_m) < fin->fin_plen) {
 928                                 if (ipf_coalesce(fin) != 1)
 929                                         return;
 930                         }
 931
 932                         if (ipf_pr_pullup(fin, ICMP6ERR_MINPKTLEN) == -1)
 933                                 return;
 934
 935                         /*
 936                          * If the destination of this packet doesn't match the
 937                          * source of the original packet then this packet is
 938                          * not correct.
 939                          */
 940                         icmp6 = fin->fin_dp;
 941                         ip6 = (ip6_t *)((char *)icmp6 + ICMPERR_ICMPHLEN);
 942                         if (IP6_NEQ(&fin->fin_fi.fi_dst,
 943                                     (i6addr_t *)&ip6->ip6_src)) {
 944                                 fin->fin_flx |= FI_BAD;
 945                                 DT1(ipf_fi_bad_icmp6, fr_info_t *, fin);
 946                         }
 947                         break;
 948                 default :
 949                         break;
 950                 }
 951         }
 952
 953         ipf_pr_short6(fin, minicmpsz);
 954         if ((fin->fin_flx & (FI_SHORT|FI_BAD)) == 0) {
 955                 u_char p = fin->fin_p;
 956
 957                 fin->fin_p = IPPROTO_ICMPV6;
 958                 ipf_checkv6sum(fin);
 959                 fin->fin_p = p;
 960         }
 961 }
 962
 963
 964 /* ------------------------------------------------------------------------ */
 965 /* Function:    ipf_pr_udp6                                                 */
 966 /* Returns:     void                                                        */
 967 /* Parameters:  fin(I) - pointer to packet information                      */
 968 /*                                                                          */
 969 /* IPv6 Only                                                                */
 970 /* Analyse the packet for IPv6/UDP properties.                              */
 971 /* Is not expected to be called for fragmented packets.                     */
 972 /* ------------------------------------------------------------------------ */
 973 static INLINE void
 974 ipf_pr_udp6(fin)
 975         fr_info_t *fin;
 976 {
 977
 978         if (ipf_pr_udpcommon(fin) == 0) {
 979                 u_char p = fin->fin_p;
 980
 981                 fin->fin_p = IPPROTO_UDP;
 982                 ipf_checkv6sum(fin);
 983                 fin->fin_p = p;
 984         }
 985 }
 986
 987
 988 /* ------------------------------------------------------------------------ */
 989 /* Function:    ipf_pr_tcp6                                                 */
 990 /* Returns:     void                                                        */
 991 /* Parameters:  fin(I) - pointer to packet information                      */
 992 /*                                                                          */
 993 /* IPv6 Only                                                                */
 994 /* Analyse the packet for IPv6/TCP properties.                              */
 995 /* Is not expected to be called for fragmented packets.                     */
 996 /* ------------------------------------------------------------------------ */
 997 static INLINE void
 998 ipf_pr_tcp6(fin)
 999         fr_info_t *fin;
1000 {
1001
1002         if (ipf_pr_tcpcommon(fin) == 0) {
1003                 u_char p = fin->fin_p;
1004
1005                 fin->fin_p = IPPROTO_TCP;
1006                 ipf_checkv6sum(fin);
1007                 fin->fin_p = p;
1008         }
1009 }
1010
1011
1012 /* ------------------------------------------------------------------------ */
1013 /* Function:    ipf_pr_esp6                                                 */
1014 /* Returns:     void                                                        */
1015 /* Parameters:  fin(I) - pointer to packet information                      */
1016 /*                                                                          */
1017 /* IPv6 Only                                                                */
1018 /* Analyse the packet for ESP properties.                                   */
1019 /* The minimum length is taken to be the SPI (32bits) plus a tail (32bits)  */
1020 /* even though the newer ESP packets must also have a sequence number that  */
1021 /* is 32bits as well, it is not possible(?) to determine the version from a */
1022 /* simple packet header.                                                    */
1023 /* ------------------------------------------------------------------------ */
1024 static INLINE void
1025 ipf_pr_esp6(fin)
1026         fr_info_t *fin;
1027 {
1028
1029         if ((fin->fin_off == 0) && (ipf_pr_pullup(fin, 8) == -1)) {
1030                 ipf_main_softc_t *softc = fin->fin_main_soft;
1031
1032                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_esp_pullup);
1033                 return;
1034         }
1035 }
1036
1037
1038 /* ------------------------------------------------------------------------ */
1039 /* Function:    ipf_pr_ah6                                                  */
1040 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
1041 /* Parameters:  fin(I) - pointer to packet information                      */
1042 /*                                                                          */
1043 /* IPv6 Only                                                                */
1044 /* Analyse the packet for AH properties.                                    */
1045 /* The minimum length is taken to be the combination of all fields in the   */
1046 /* header being present and no authentication data (null algorithm used.)   */
1047 /* ------------------------------------------------------------------------ */
1048 static INLINE int
1049 ipf_pr_ah6(fin)
1050         fr_info_t *fin;
1051 {
1052         authhdr_t *ah;
1053
1054         fin->fin_flx |= FI_AH;
1055
1056         ah = (authhdr_t *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_HOPOPTS);
1057         if (ah == NULL) {
1058                 ipf_main_softc_t *softc = fin->fin_main_soft;
1059
1060                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ah_bad);
1061                 return IPPROTO_NONE;
1062         }
1063
1064         ipf_pr_short6(fin, sizeof(*ah));
1065
1066         /*
1067          * No need for another pullup, ipf_pr_ipv6exthdr() will pullup
1068          * enough data to satisfy ah_next (the very first one.)
1069          */
1070         return ah->ah_next;
1071 }
1072
1073
1074 /* ------------------------------------------------------------------------ */
1075 /* Function:    ipf_pr_gre6                                                 */
1076 /* Returns:     void                                                        */
1077 /* Parameters:  fin(I) - pointer to packet information                      */
1078 /*                                                                          */
1079 /* Analyse the packet for GRE properties.                                   */
1080 /* ------------------------------------------------------------------------ */
1081 static INLINE void
1082 ipf_pr_gre6(fin)
1083         fr_info_t *fin;
1084 {
1085         grehdr_t *gre;
1086
1087         if (ipf_pr_pullup(fin, sizeof(grehdr_t)) == -1) {
1088                 ipf_main_softc_t *softc = fin->fin_main_soft;
1089
1090                 LBUMPD(ipf_stats[fin->fin_out], fr_v6_gre_pullup);
1091                 return;
1092         }
1093
1094         gre = fin->fin_dp;
1095         if (GRE_REV(gre->gr_flags) == 1)
1096                 fin->fin_data[0] = gre->gr_call;
1097 }
1098 #endif  /* USE_INET6 */
1099
1100
1101 /* ------------------------------------------------------------------------ */
1102 /* Function:    ipf_pr_pullup                                               */
1103 /* Returns:     int     - 0 == pullup succeeded, -1 == failure              */
1104 /* Parameters:  fin(I)  - pointer to packet information                     */
1105 /*              plen(I) - length (excluding L3 header) to pullup            */
1106 /*                                                                          */
1107 /* Short inline function to cut down on code duplication to perform a call  */
1108 /* to ipf_pullup to ensure there is the required amount of data,            */
1109 /* consecutively in the packet buffer.                                      */
1110 /*                                                                          */
1111 /* This function pulls up 'extra' data at the location of fin_dp.  fin_dp   */
1112 /* points to the first byte after the complete layer 3 header, which will   */
1113 /* include all of the known extension headers for IPv6 or options for IPv4. */
1114 /*                                                                          */
1115 /* Since fr_pullup() expects the total length of bytes to be pulled up, it  */
1116 /* is necessary to add those we can already assume to be pulled up (fin_dp  */
1117 /* - fin_ip) to what is passed through.                                     */
1118 /* ------------------------------------------------------------------------ */
1119 int
1120 ipf_pr_pullup(fin, plen)
1121         fr_info_t *fin;
1122         int plen;
1123 {
1124         ipf_main_softc_t *softc = fin->fin_main_soft;
1125
1126         if (fin->fin_m != NULL) {
1127                 if (fin->fin_dp != NULL)
1128                         plen += (char *)fin->fin_dp -
1129                                 ((char *)fin->fin_ip + fin->fin_hlen);
1130                 plen += fin->fin_hlen;
1131                 if (M_LEN(fin->fin_m) < plen + fin->fin_ipoff) {
1132 #if defined(_KERNEL)
1133                         if (ipf_pullup(fin->fin_m, fin, plen) == NULL) {
1134                                 DT(ipf_pullup_fail);
1135                                 LBUMP(ipf_stats[fin->fin_out].fr_pull[1]);
1136                                 return -1;
1137                         }
1138                         LBUMP(ipf_stats[fin->fin_out].fr_pull[0]);
1139 #else
1140                         LBUMP(ipf_stats[fin->fin_out].fr_pull[1]);
1141                         /*
1142                          * Fake ipf_pullup failing
1143                          */
1144                         fin->fin_reason = FRB_PULLUP;
1145                         *fin->fin_mp = NULL;
1146                         fin->fin_m = NULL;
1147                         fin->fin_ip = NULL;
1148                         return -1;
1149 #endif
1150                 }
1151         }
1152         return 0;
1153 }
1154
1155
1156 /* ------------------------------------------------------------------------ */
1157 /* Function:    ipf_pr_short                                                */
1158 /* Returns:     void                                                        */
1159 /* Parameters:  fin(I)  - pointer to packet information                     */
1160 /*              xmin(I) - minimum header size                               */
1161 /*                                                                          */
1162 /* Check if a packet is "short" as defined by xmin.  The rule we are        */
1163 /* applying here is that the packet must not be fragmented within the layer */
1164 /* 4 header.  That is, it must not be a fragment that has its offset set to */
1165 /* start within the layer 4 header (hdrmin) or if it is at offset 0, the    */
1166 /* entire layer 4 header must be present (min).                             */
1167 /* ------------------------------------------------------------------------ */
1168 static INLINE void
1169 ipf_pr_short(fin, xmin)
1170         fr_info_t *fin;
1171         int xmin;
1172 {
1173
1174         if (fin->fin_off == 0) {
1175                 if (fin->fin_dlen < xmin)
1176                         fin->fin_flx |= FI_SHORT;
1177         } else if (fin->fin_off < xmin) {
1178                 fin->fin_flx |= FI_SHORT;
1179         }
1180 }
1181
1182
1183 /* ------------------------------------------------------------------------ */
1184 /* Function:    ipf_pr_icmp                                                 */
1185 /* Returns:     void                                                        */
1186 /* Parameters:  fin(I) - pointer to packet information                      */
1187 /*                                                                          */
1188 /* IPv4 Only                                                                */
1189 /* Do a sanity check on the packet for ICMP (v4).  In nearly all cases,     */
1190 /* except extrememly bad packets, both type and code will be present.       */
1191 /* The expected minimum size of an ICMP packet is very much dependent on    */
1192 /* the type of it.                                                          */
1193 /*                                                                          */
1194 /* XXX - other ICMP sanity checks?                                          */
1195 /* ------------------------------------------------------------------------ */
1196 static INLINE void
1197 ipf_pr_icmp(fin)
1198         fr_info_t *fin;
1199 {
1200         ipf_main_softc_t *softc = fin->fin_main_soft;
1201         int minicmpsz = sizeof(struct icmp);
1202         icmphdr_t *icmp;
1203         ip_t *oip;
1204
1205         ipf_pr_short(fin, ICMPERR_ICMPHLEN);
1206
1207         if (fin->fin_off != 0) {
1208                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_icmp_frag);
1209                 return;
1210         }
1211
1212         if (ipf_pr_pullup(fin, ICMPERR_ICMPHLEN) == -1) {
1213                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_icmp_pullup);
1214                 return;
1215         }
1216
1217         icmp = fin->fin_dp;
1218
1219         fin->fin_data[0] = *(u_short *)icmp;
1220         fin->fin_data[1] = icmp->icmp_id;
1221
1222         switch (icmp->icmp_type)
1223         {
1224         case ICMP_ECHOREPLY :
1225         case ICMP_ECHO :
1226         /* Router discovery messaes - RFC 1256 */
1227         case ICMP_ROUTERADVERT :
1228         case ICMP_ROUTERSOLICIT :
1229                 fin->fin_flx |= FI_ICMPQUERY;
1230                 minicmpsz = ICMP_MINLEN;
1231                 break;
1232         /*
1233          * type(1) + code(1) + cksum(2) + id(2) seq(2) +
1234          * 3 * timestamp(3 * 4)
1235          */
1236         case ICMP_TSTAMP :
1237         case ICMP_TSTAMPREPLY :
1238                 fin->fin_flx |= FI_ICMPQUERY;
1239                 minicmpsz = 20;
1240                 break;
1241         /*
1242          * type(1) + code(1) + cksum(2) + id(2) seq(2) +
1243          * mask(4)
1244          */
1245         case ICMP_IREQ :
1246         case ICMP_IREQREPLY :
1247         case ICMP_MASKREQ :
1248         case ICMP_MASKREPLY :
1249                 fin->fin_flx |= FI_ICMPQUERY;
1250                 minicmpsz = 12;
1251                 break;
1252         /*
1253          * type(1) + code(1) + cksum(2) + id(2) seq(2) + ip(20+)
1254          */
1255         case ICMP_UNREACH :
1256 #ifdef icmp_nextmtu
1257                 if (icmp->icmp_code == ICMP_UNREACH_NEEDFRAG) {
1258                         if (icmp->icmp_nextmtu < softc->ipf_icmpminfragmtu) {
1259                                 fin->fin_flx |= FI_BAD;
1260                                 DT3(ipf_fi_bad_icmp_nextmtu, fr_info_t *, fin, u_int, icmp->icmp_nextmtu, u_int, softc->ipf_icmpminfragmtu);
1261                         }
1262                 }
1263 #endif
1264                 /* FALLTHROUGH */
1265         case ICMP_SOURCEQUENCH :
1266         case ICMP_REDIRECT :
1267         case ICMP_TIMXCEED :
1268         case ICMP_PARAMPROB :
1269                 fin->fin_flx |= FI_ICMPERR;
1270                 if (ipf_coalesce(fin) != 1) {
1271                         LBUMPD(ipf_stats[fin->fin_out], fr_icmp_coalesce);
1272                         return;
1273                 }
1274
1275                 /*
1276                  * ICMP error packets should not be generated for IP
1277                  * packets that are a fragment that isn't the first
1278                  * fragment.
1279                  */
1280                 oip = (ip_t *)((char *)fin->fin_dp + ICMPERR_ICMPHLEN);
1281                 if ((ntohs(oip->ip_off) & IP_OFFMASK) != 0) {
1282                         fin->fin_flx |= FI_BAD;
1283                         DT2(ipf_fi_bad_icmp_err, fr_info_t, fin, u_int, (ntohs(oip->ip_off) & IP_OFFMASK));
1284                 }
1285
1286                 /*
1287                  * If the destination of this packet doesn't match the
1288                  * source of the original packet then this packet is
1289                  * not correct.
1290                  */
1291                 if (oip->ip_src.s_addr != fin->fin_daddr) {
1292                         fin->fin_flx |= FI_BAD;
1293                         DT1(ipf_fi_bad_src_ne_dst, fr_info_t *, fin);
1294                 }
1295                 break;
1296         default :
1297                 break;
1298         }
1299
1300         ipf_pr_short(fin, minicmpsz);
1301
1302         ipf_checkv4sum(fin);
1303 }
1304
1305
1306 /* ------------------------------------------------------------------------ */
1307 /* Function:    ipf_pr_tcpcommon                                            */
1308 /* Returns:     int    - 0 = header ok, 1 = bad packet, -1 = buffer error   */
1309 /* Parameters:  fin(I) - pointer to packet information                      */
1310 /*                                                                          */
1311 /* TCP header sanity checking.  Look for bad combinations of TCP flags,     */
1312 /* and make some checks with how they interact with other fields.           */
1313 /* If compiled with IPFILTER_CKSUM, check to see if the TCP checksum is     */
1314 /* valid and mark the packet as bad if not.                                 */
1315 /* ------------------------------------------------------------------------ */
1316 static INLINE int
1317 ipf_pr_tcpcommon(fin)
1318         fr_info_t *fin;
1319 {
1320         ipf_main_softc_t *softc = fin->fin_main_soft;
1321         int flags, tlen;
1322         tcphdr_t *tcp;
1323
1324         fin->fin_flx |= FI_TCPUDP;
1325         if (fin->fin_off != 0) {
1326                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_frag);
1327                 return 0;
1328         }
1329
1330         if (ipf_pr_pullup(fin, sizeof(*tcp)) == -1) {
1331                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_pullup);
1332                 return -1;
1333         }
1334
1335         tcp = fin->fin_dp;
1336         if (fin->fin_dlen > 3) {
1337                 fin->fin_sport = ntohs(tcp->th_sport);
1338                 fin->fin_dport = ntohs(tcp->th_dport);
1339         }
1340
1341         if ((fin->fin_flx & FI_SHORT) != 0) {
1342                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_short);
1343                 return 1;
1344         }
1345
1346         /*
1347          * Use of the TCP data offset *must* result in a value that is at
1348          * least the same size as the TCP header.
1349          */
1350         tlen = TCP_OFF(tcp) << 2;
1351         if (tlen < sizeof(tcphdr_t)) {
1352                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_small);
1353                 fin->fin_flx |= FI_BAD;
1354                 DT3(ipf_fi_bad_tlen, fr_info_t, fin, u_int, tlen, u_int, sizeof(tcphdr_t));
1355                 return 1;
1356         }
1357
1358         flags = tcp->th_flags;
1359         fin->fin_tcpf = tcp->th_flags;
1360
1361         /*
1362          * If the urgent flag is set, then the urgent pointer must
1363          * also be set and vice versa.  Good TCP packets do not have
1364          * just one of these set.
1365          */
1366         if ((flags & TH_URG) != 0 && (tcp->th_urp == 0)) {
1367                 fin->fin_flx |= FI_BAD;
1368                 DT3(ipf_fi_bad_th_urg, fr_info_t*, fin, u_int, (flags & TH_URG), u_int, tcp->th_urp);
1369 #if 0
1370         } else if ((flags & TH_URG) == 0 && (tcp->th_urp != 0)) {
1371                 /*
1372                  * Ignore this case (#if 0) as it shows up in "real"
1373                  * traffic with bogus values in the urgent pointer field.
1374                  */
1375                 fin->fin_flx |= FI_BAD;
1376                 DT3(ipf_fi_bad_th_urg0, fr_info_t *, fin, u_int, (flags & TH_URG), u_int, tcp->th_urp);
1377 #endif
1378         } else if (((flags & (TH_SYN|TH_FIN)) != 0) &&
1379                    ((flags & (TH_RST|TH_ACK)) == TH_RST)) {
1380                 /* TH_FIN|TH_RST|TH_ACK seems to appear "naturally" */
1381                 fin->fin_flx |= FI_BAD;
1382                 DT1(ipf_fi_bad_th_fin_rst_ack, fr_info_t, fin);
1383 #if 1
1384         } else if (((flags & TH_SYN) != 0) &&
1385                    ((flags & (TH_URG|TH_PUSH)) != 0)) {
1386                 /*
1387                  * SYN with URG and PUSH set is not for normal TCP but it is
1388                  * possible(?) with T/TCP...but who uses T/TCP?
1389                  */
1390                 fin->fin_flx |= FI_BAD;
1391                 DT1(ipf_fi_bad_th_syn_urg_psh, fr_info_t *, fin);
1392 #endif
1393         } else if (!(flags & TH_ACK)) {
1394                 /*
1395                  * If the ack bit isn't set, then either the SYN or
1396                  * RST bit must be set.  If the SYN bit is set, then
1397                  * we expect the ACK field to be 0.  If the ACK is
1398                  * not set and if URG, PSH or FIN are set, consdier
1399                  * that to indicate a bad TCP packet.
1400                  */
1401                 if ((flags == TH_SYN) && (tcp->th_ack != 0)) {
1402                         /*
1403                          * Cisco PIX sets the ACK field to a random value.
1404                          * In light of this, do not set FI_BAD until a patch
1405                          * is available from Cisco to ensure that
1406                          * interoperability between existing systems is
1407                          * achieved.
1408                          */
1409                         /*fin->fin_flx |= FI_BAD*/;
1410                         /*DT1(ipf_fi_bad_th_syn_ack, fr_info_t *, fin);*/
1411                 } else if (!(flags & (TH_RST|TH_SYN))) {
1412                         fin->fin_flx |= FI_BAD;
1413                         DT1(ipf_fi_bad_th_rst_syn, fr_info_t *, fin);
1414                 } else if ((flags & (TH_URG|TH_PUSH|TH_FIN)) != 0) {
1415                         fin->fin_flx |= FI_BAD;
1416                         DT1(ipf_fi_bad_th_urg_push_fin, fr_info_t *, fin);
1417                 }
1418         }
1419         if (fin->fin_flx & FI_BAD) {
1420                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_bad_flags);
1421                 return 1;
1422         }
1423
1424         /*
1425          * At this point, it's not exactly clear what is to be gained by
1426          * marking up which TCP options are and are not present.  The one we
1427          * are most interested in is the TCP window scale.  This is only in
1428          * a SYN packet [RFC1323] so we don't need this here...?
1429          * Now if we were to analyse the header for passive fingerprinting,
1430          * then that might add some weight to adding this...
1431          */
1432         if (tlen == sizeof(tcphdr_t)) {
1433                 return 0;
1434         }
1435
1436         if (ipf_pr_pullup(fin, tlen) == -1) {
1437                 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_pullup);
1438                 return -1;
1439         }
1440
1441 #if 0
1442         tcp = fin->fin_dp;
1443         ip = fin->fin_ip;
1444         s = (u_char *)(tcp + 1);
1445         off = IP_HL(ip) << 2;
1446 # ifdef _KERNEL
1447         if (fin->fin_mp != NULL) {
1448                 mb_t *m = *fin->fin_mp;
1449
1450                 if (off + tlen > M_LEN(m))
1451                         return;
1452         }
1453 # endif
1454         for (tlen -= (int)sizeof(*tcp); tlen > 0; ) {
1455                 opt = *s;
1456                 if (opt == '\0')
1457                         break;
1458                 else if (opt == TCPOPT_NOP)
1459                         ol = 1;
1460                 else {
1461                         if (tlen < 2)
1462                                 break;
1463                         ol = (int)*(s + 1);
1464                         if (ol < 2 || ol > tlen)
1465                                 break;
1466                 }
1467
1468                 for (i = 9, mv = 4; mv >= 0; ) {
1469                         op = ipopts + i;
1470                         if (opt == (u_char)op->ol_val) {
1471                                 optmsk |= op->ol_bit;
1472                                 break;
1473                         }
1474                 }
1475                 tlen -= ol;
1476                 s += ol;
1477         }
1478 #endif /* 0 */
1479
1480         return 0;
1481 }
1482
1483
1484
1485 /* ------------------------------------------------------------------------ */
1486 /* Function:    ipf_pr_udpcommon                                            */
1487 /* Returns:     int    - 0 = header ok, 1 = bad packet                      */
1488 /* Parameters:  fin(I) - pointer to packet information                      */
1489 /*                                                                          */
1490 /* Extract the UDP source and destination ports, if present.  If compiled   */
1491 /* with IPFILTER_CKSUM, check to see if the UDP checksum is valid.          */
1492 /* ------------------------------------------------------------------------ */
1493 static INLINE int
1494 ipf_pr_udpcommon(fin)
1495         fr_info_t *fin;
1496 {
1497         udphdr_t *udp;
1498
1499         fin->fin_flx |= FI_TCPUDP;
1500
1501         if (!fin->fin_off && (fin->fin_dlen > 3)) {
1502                 if (ipf_pr_pullup(fin, sizeof(*udp)) == -1) {
1503                         ipf_main_softc_t *softc = fin->fin_main_soft;
1504
1505                         fin->fin_flx |= FI_SHORT;
1506                         LBUMPD(ipf_stats[fin->fin_out], fr_udp_pullup);
1507                         return 1;
1508                 }
1509
1510                 udp = fin->fin_dp;
1511
1512                 fin->fin_sport = ntohs(udp->uh_sport);
1513                 fin->fin_dport = ntohs(udp->uh_dport);
1514         }
1515
1516         return 0;
1517 }
1518
1519
1520 /* ------------------------------------------------------------------------ */
1521 /* Function:    ipf_pr_tcp                                                  */
1522 /* Returns:     void                                                        */
1523 /* Parameters:  fin(I) - pointer to packet information                      */
1524 /*                                                                          */
1525 /* IPv4 Only                                                                */
1526 /* Analyse the packet for IPv4/TCP properties.                              */
1527 /* ------------------------------------------------------------------------ */
1528 static INLINE void
1529 ipf_pr_tcp(fin)
1530         fr_info_t *fin;
1531 {
1532
1533         ipf_pr_short(fin, sizeof(tcphdr_t));
1534
1535         if (ipf_pr_tcpcommon(fin) == 0)
1536                 ipf_checkv4sum(fin);
1537 }
1538
1539
1540 /* ------------------------------------------------------------------------ */
1541 /* Function:    ipf_pr_udp                                                  */
1542 /* Returns:     void                                                        */
1543 /* Parameters:  fin(I) - pointer to packet information                      */
1544 /*                                                                          */
1545 /* IPv4 Only                                                                */
1546 /* Analyse the packet for IPv4/UDP properties.                              */
1547 /* ------------------------------------------------------------------------ */
1548 static INLINE void
1549 ipf_pr_udp(fin)
1550         fr_info_t *fin;
1551 {
1552
1553         ipf_pr_short(fin, sizeof(udphdr_t));
1554
1555         if (ipf_pr_udpcommon(fin) == 0)
1556                 ipf_checkv4sum(fin);
1557 }
1558
1559
1560 /* ------------------------------------------------------------------------ */
1561 /* Function:    ipf_pr_esp                                                  */
1562 /* Returns:     void                                                        */
1563 /* Parameters:  fin(I) - pointer to packet information                      */
1564 /*                                                                          */
1565 /* Analyse the packet for ESP properties.                                   */
1566 /* The minimum length is taken to be the SPI (32bits) plus a tail (32bits)  */
1567 /* even though the newer ESP packets must also have a sequence number that  */
1568 /* is 32bits as well, it is not possible(?) to determine the version from a */
1569 /* simple packet header.                                                    */
1570 /* ------------------------------------------------------------------------ */
1571 static INLINE void
1572 ipf_pr_esp(fin)
1573         fr_info_t *fin;
1574 {
1575
1576         if (fin->fin_off == 0) {
1577                 ipf_pr_short(fin, 8);
1578                 if (ipf_pr_pullup(fin, 8) == -1) {
1579                         ipf_main_softc_t *softc = fin->fin_main_soft;
1580
1581                         LBUMPD(ipf_stats[fin->fin_out], fr_v4_esp_pullup);
1582                 }
1583         }
1584 }
1585
1586
1587 /* ------------------------------------------------------------------------ */
1588 /* Function:    ipf_pr_ah                                                   */
1589 /* Returns:     int    - value of the next header or IPPROTO_NONE if error  */
1590 /* Parameters:  fin(I) - pointer to packet information                      */
1591 /*                                                                          */
1592 /* Analyse the packet for AH properties.                                    */
1593 /* The minimum length is taken to be the combination of all fields in the   */
1594 /* header being present and no authentication data (null algorithm used.)   */
1595 /* ------------------------------------------------------------------------ */
1596 static INLINE int
1597 ipf_pr_ah(fin)
1598         fr_info_t *fin;
1599 {
1600         ipf_main_softc_t *softc = fin->fin_main_soft;
1601         authhdr_t *ah;
1602         int len;
1603
1604         fin->fin_flx |= FI_AH;
1605         ipf_pr_short(fin, sizeof(*ah));
1606
1607         if (((fin->fin_flx & FI_SHORT) != 0) || (fin->fin_off != 0)) {
1608                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_ah_bad);
1609                 return IPPROTO_NONE;
1610         }
1611
1612         if (ipf_pr_pullup(fin, sizeof(*ah)) == -1) {
1613                 DT(fr_v4_ah_pullup_1);
1614                 LBUMP(ipf_stats[fin->fin_out].fr_v4_ah_pullup);
1615                 return IPPROTO_NONE;
1616         }
1617
1618         ah = (authhdr_t *)fin->fin_dp;
1619
1620         len = (ah->ah_plen + 2) << 2;
1621         ipf_pr_short(fin, len);
1622         if (ipf_pr_pullup(fin, len) == -1) {
1623                 DT(fr_v4_ah_pullup_2);
1624                 LBUMP(ipf_stats[fin->fin_out].fr_v4_ah_pullup);
1625                 return IPPROTO_NONE;
1626         }
1627
1628         /*
1629          * Adjust fin_dp and fin_dlen for skipping over the authentication
1630          * header.
1631          */
1632         fin->fin_dp = (char *)fin->fin_dp + len;
1633         fin->fin_dlen -= len;
1634         return ah->ah_next;
1635 }
1636
1637
1638 /* ------------------------------------------------------------------------ */
1639 /* Function:    ipf_pr_gre                                                  */
1640 /* Returns:     void                                                        */
1641 /* Parameters:  fin(I) - pointer to packet information                      */
1642 /*                                                                          */
1643 /* Analyse the packet for GRE properties.                                   */
1644 /* ------------------------------------------------------------------------ */
1645 static INLINE void
1646 ipf_pr_gre(fin)
1647         fr_info_t *fin;
1648 {
1649         ipf_main_softc_t *softc = fin->fin_main_soft;
1650         grehdr_t *gre;
1651
1652         ipf_pr_short(fin, sizeof(grehdr_t));
1653
1654         if (fin->fin_off != 0) {
1655                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_gre_frag);
1656                 return;
1657         }
1658
1659         if (ipf_pr_pullup(fin, sizeof(grehdr_t)) == -1) {
1660                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_gre_pullup);
1661                 return;
1662         }
1663
1664         gre = fin->fin_dp;
1665         if (GRE_REV(gre->gr_flags) == 1)
1666                 fin->fin_data[0] = gre->gr_call;
1667 }
1668
1669
1670 /* ------------------------------------------------------------------------ */
1671 /* Function:    ipf_pr_ipv4hdr                                              */
1672 /* Returns:     void                                                        */
1673 /* Parameters:  fin(I) - pointer to packet information                      */
1674 /*                                                                          */
1675 /* IPv4 Only                                                                */
1676 /* Analyze the IPv4 header and set fields in the fr_info_t structure.       */
1677 /* Check all options present and flag their presence if any exist.          */
1678 /* ------------------------------------------------------------------------ */
1679 static INLINE void
1680 ipf_pr_ipv4hdr(fin)
1681         fr_info_t *fin;
1682 {
1683         u_short optmsk = 0, secmsk = 0, auth = 0;
1684         int hlen, ol, mv, p, i;
1685         const struct optlist *op;
1686         u_char *s, opt;
1687         u_short off;
1688         fr_ip_t *fi;
1689         ip_t *ip;
1690
1691         fi = &fin->fin_fi;
1692         hlen = fin->fin_hlen;
1693
1694         ip = fin->fin_ip;
1695         p = ip->ip_p;
1696         fi->fi_p = p;
1697         fin->fin_crc = p;
1698         fi->fi_tos = ip->ip_tos;
1699         fin->fin_id = ip->ip_id;
1700         off = ntohs(ip->ip_off);
1701
1702         /* Get both TTL and protocol */
1703         fi->fi_p = ip->ip_p;
1704         fi->fi_ttl = ip->ip_ttl;
1705
1706         /* Zero out bits not used in IPv6 address */
1707         fi->fi_src.i6[1] = 0;
1708         fi->fi_src.i6[2] = 0;
1709         fi->fi_src.i6[3] = 0;
1710         fi->fi_dst.i6[1] = 0;
1711         fi->fi_dst.i6[2] = 0;
1712         fi->fi_dst.i6[3] = 0;
1713
1714         fi->fi_saddr = ip->ip_src.s_addr;
1715         fin->fin_crc += fi->fi_saddr;
1716         fi->fi_daddr = ip->ip_dst.s_addr;
1717         fin->fin_crc += fi->fi_daddr;
1718         if (IN_CLASSD(ntohl(fi->fi_daddr)))
1719                 fin->fin_flx |= FI_MULTICAST|FI_MBCAST;
1720
1721         /*
1722          * set packet attribute flags based on the offset and
1723          * calculate the byte offset that it represents.
1724          */
1725         off &= IP_MF|IP_OFFMASK;
1726         if (off != 0) {
1727                 int morefrag = off & IP_MF;
1728
1729                 fi->fi_flx |= FI_FRAG;
1730                 off &= IP_OFFMASK;
1731                 if (off != 0) {
1732                         fin->fin_flx |= FI_FRAGBODY;
1733                         off <<= 3;
1734                         if ((off + fin->fin_dlen > 65535) ||
1735                             (fin->fin_dlen == 0) ||
1736                             ((morefrag != 0) && ((fin->fin_dlen & 7) != 0))) {
1737                                 /*
1738                                  * The length of the packet, starting at its
1739                                  * offset cannot exceed 65535 (0xffff) as the
1740                                  * length of an IP packet is only 16 bits.
1741                                  *
1742                                  * Any fragment that isn't the last fragment
1743                                  * must have a length greater than 0 and it
1744                                  * must be an even multiple of 8.
1745                                  */
1746                                 fi->fi_flx |= FI_BAD;
1747                                 DT1(ipf_fi_bad_fragbody_gt_65535, fr_info_t *, fin);
1748                         }
1749                 }
1750         }
1751         fin->fin_off = off;
1752
1753         /*
1754          * Call per-protocol setup and checking
1755          */
1756         if (p == IPPROTO_AH) {
1757                 /*
1758                  * Treat AH differently because we expect there to be another
1759                  * layer 4 header after it.
1760                  */
1761                 p = ipf_pr_ah(fin);
1762         }
1763
1764         switch (p)
1765         {
1766         case IPPROTO_UDP :
1767                 ipf_pr_udp(fin);
1768                 break;
1769         case IPPROTO_TCP :
1770                 ipf_pr_tcp(fin);
1771                 break;
1772         case IPPROTO_ICMP :
1773                 ipf_pr_icmp(fin);
1774                 break;
1775         case IPPROTO_ESP :
1776                 ipf_pr_esp(fin);
1777                 break;
1778         case IPPROTO_GRE :
1779                 ipf_pr_gre(fin);
1780                 break;
1781         }
1782
1783         ip = fin->fin_ip;
1784         if (ip == NULL)
1785                 return;
1786
1787         /*
1788          * If it is a standard IP header (no options), set the flag fields
1789          * which relate to options to 0.
1790          */
1791         if (hlen == sizeof(*ip)) {
1792                 fi->fi_optmsk = 0;
1793                 fi->fi_secmsk = 0;
1794                 fi->fi_auth = 0;
1795                 return;
1796         }
1797
1798         /*
1799          * So the IP header has some IP options attached.  Walk the entire
1800          * list of options present with this packet and set flags to indicate
1801          * which ones are here and which ones are not.  For the somewhat out
1802          * of date and obscure security classification options, set a flag to
1803          * represent which classification is present.
1804          */
1805         fi->fi_flx |= FI_OPTIONS;
1806
1807         for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) {
1808                 opt = *s;
1809                 if (opt == '\0')
1810                         break;
1811                 else if (opt == IPOPT_NOP)
1812                         ol = 1;
1813                 else {
1814                         if (hlen < 2)
1815                                 break;
1816                         ol = (int)*(s + 1);
1817                         if (ol < 2 || ol > hlen)
1818                                 break;
1819                 }
1820                 for (i = 9, mv = 4; mv >= 0; ) {
1821                         op = ipopts + i;
1822
1823                         if ((opt == (u_char)op->ol_val) && (ol > 4)) {
1824                                 u_32_t doi;
1825
1826                                 switch (opt)
1827                                 {
1828                                 case IPOPT_SECURITY :
1829                                         if (optmsk & op->ol_bit) {
1830                                                 fin->fin_flx |= FI_BAD;
1831                                                 DT2(ipf_fi_bad_ipopt_security, fr_info_t *, fin, u_short, (optmsk & op->ol_bit));
1832                                         } else {
1833                                                 doi = ipf_checkripso(s);
1834                                                 secmsk = doi >> 16;
1835                                                 auth = doi & 0xffff;
1836                                         }
1837                                         break;
1838
1839                                 case IPOPT_CIPSO :
1840
1841                                         if (optmsk & op->ol_bit) {
1842                                                 fin->fin_flx |= FI_BAD;
1843                                                 DT2(ipf_fi_bad_ipopt_cipso, fr_info_t *, fin, u_short, (optmsk & op->ol_bit));
1844                                         } else {
1845                                                 doi = ipf_checkcipso(fin,
1846                                                                      s, ol);
1847                                                 secmsk = doi >> 16;
1848                                                 auth = doi & 0xffff;
1849                                         }
1850                                         break;
1851                                 }
1852                                 optmsk |= op->ol_bit;
1853                         }
1854
1855                         if (opt < op->ol_val)
1856                                 i -= mv;
1857                         else
1858                                 i += mv;
1859                         mv--;
1860                 }
1861                 hlen -= ol;
1862                 s += ol;
1863         }
1864
1865         /*
1866          *
1867          */
1868         if (auth && !(auth & 0x0100))
1869                 auth &= 0xff00;
1870         fi->fi_optmsk = optmsk;
1871         fi->fi_secmsk = secmsk;
1872         fi->fi_auth = auth;
1873 }
1874
1875
1876 /* ------------------------------------------------------------------------ */
1877 /* Function:    ipf_checkripso                                              */
1878 /* Returns:     void                                                        */
1879 /* Parameters:  s(I)   - pointer to start of RIPSO option                   */
1880 /*                                                                          */
1881 /* ------------------------------------------------------------------------ */
1882 static u_32_t
1883 ipf_checkripso(s)
1884         u_char *s;
1885 {
1886         const struct optlist *sp;
1887         u_short secmsk = 0, auth = 0;
1888         u_char sec;
1889         int j, m;
1890
1891         sec = *(s + 2); /* classification */
1892         for (j = 3, m = 2; m >= 0; ) {
1893                 sp = secopt + j;
1894                 if (sec == sp->ol_val) {
1895                         secmsk |= sp->ol_bit;
1896                         auth = *(s + 3);
1897                         auth *= 256;
1898                         auth += *(s + 4);
1899                         break;
1900                 }
1901                 if (sec < sp->ol_val)
1902                         j -= m;
1903                 else
1904                         j += m;
1905                 m--;
1906         }
1907
1908         return (secmsk << 16) | auth;
1909 }
1910
1911
1912 /* ------------------------------------------------------------------------ */
1913 /* Function:    ipf_checkcipso                                              */
1914 /* Returns:     u_32_t  - 0 = failure, else the doi from the header         */
1915 /* Parameters:  fin(IO) - pointer to packet information                     */
1916 /*              s(I)    - pointer to start of CIPSO option                  */
1917 /*              ol(I)   - length of CIPSO option field                      */
1918 /*                                                                          */
1919 /* This function returns the domain of integrity (DOI) field from the CIPSO */
1920 /* header and returns that whilst also storing the highest sensitivity      */
1921 /* value found in the fr_info_t structure.                                  */
1922 /*                                                                          */
1923 /* No attempt is made to extract the category bitmaps as these are defined  */
1924 /* by the user (rather than the protocol) and can be rather numerous on the */
1925 /* end nodes.                                                               */
1926 /* ------------------------------------------------------------------------ */
1927 static u_32_t
1928 ipf_checkcipso(fin, s, ol)
1929         fr_info_t *fin;
1930         u_char *s;
1931         int ol;
1932 {
1933         ipf_main_softc_t *softc = fin->fin_main_soft;
1934         fr_ip_t *fi;
1935         u_32_t doi;
1936         u_char *t, tag, tlen, sensitivity;
1937         int len;
1938
1939         if (ol < 6 || ol > 40) {
1940                 LBUMPD(ipf_stats[fin->fin_out], fr_v4_cipso_bad);
1941                 fin->fin_flx |= FI_BAD;
1942                 DT2(ipf_fi_bad_checkcipso_ol, fr_info_t *, fin, u_int, ol);
1943                 return 0;
1944         }
1945
1946         fi = &fin->fin_fi;
1947         fi->fi_sensitivity = 0;
1948         /*
1949          * The DOI field MUST be there.
1950          */
1951         bcopy(s + 2, &doi, sizeof(doi));
1952
1953         t = (u_char *)s + 6;
1954         for (len = ol - 6; len >= 2; len -= tlen, t+= tlen) {
1955                 tag = *t;
1956                 tlen = *(t + 1);
1957                 if (tlen > len || tlen < 4 || tlen > 34) {
1958                         LBUMPD(ipf_stats[fin->fin_out], fr_v4_cipso_tlen);
1959                         fin->fin_flx |= FI_BAD;
1960                         DT2(ipf_fi_bad_checkcipso_tlen, fr_info_t *, fin, u_int, tlen);
1961                         return 0;
1962                 }
1963
1964                 sensitivity = 0;
1965                 /*
1966                  * Tag numbers 0, 1, 2, 5 are laid out in the CIPSO Internet
1967                  * draft (16 July 1992) that has expired.
1968                  */
1969                 if (tag == 0) {
1970                         fin->fin_flx |= FI_BAD;
1971                         DT2(ipf_fi_bad_checkcipso_tag, fr_info_t *, fin, u_int, tag);
1972                         continue;
1973                 } else if (tag == 1) {
1974                         if (*(t + 2) != 0) {
1975                                 fin->fin_flx |= FI_BAD;
1976                                 DT2(ipf_fi_bad_checkcipso_tag1_t2, fr_info_t *, fin, u_int, (*t + 2));
1977                                 continue;
1978                         }
1979                         sensitivity = *(t + 3);
1980                         /* Category bitmap for categories 0-239 */
1981
1982                 } else if (tag == 4) {
1983                         if (*(t + 2) != 0) {
1984                                 fin->fin_flx |= FI_BAD;
1985                                 DT2(ipf_fi_bad_checkcipso_tag4_t2, fr_info_t *, fin, u_int, (*t + 2));
1986                                 continue;
1987                         }
1988                         sensitivity = *(t + 3);
1989                         /* Enumerated categories, 16bits each, upto 15 */
1990
1991                 } else if (tag == 5) {
1992                         if (*(t + 2) != 0) {
1993                                 fin->fin_flx |= FI_BAD;
1994                                 DT2(ipf_fi_bad_checkcipso_tag5_t2, fr_info_t *, fin, u_int, (*t + 2));
1995                                 continue;
1996                         }
1997                         sensitivity = *(t + 3);
1998                         /* Range of categories (2*16bits), up to 7 pairs */
1999
2000                 } else if (tag > 127) {
2001                         /* Custom defined DOI */
2002                         ;
2003                 } else {
2004                         fin->fin_flx |= FI_BAD;
2005                         DT2(ipf_fi_bad_checkcipso_tag127, fr_info_t *, fin, u_int, tag);
2006                         continue;
2007                 }
2008
2009                 if (sensitivity > fi->fi_sensitivity)
2010                         fi->fi_sensitivity = sensitivity;
2011         }
2012
2013         return doi;
2014 }
2015
2016
2017 /* ------------------------------------------------------------------------ */
2018 /* Function:    ipf_makefrip                                                */
2019 /* Returns:     int     - 0 == packet ok, -1 == packet freed                */
2020 /* Parameters:  hlen(I) - length of IP packet header                        */
2021 /*              ip(I)   - pointer to the IP header                          */
2022 /*              fin(IO) - pointer to packet information                     */
2023 /*                                                                          */
2024 /* Compact the IP header into a structure which contains just the info.     */
2025 /* which is useful for comparing IP headers with and store this information */
2026 /* in the fr_info_t structure pointer to by fin.  At present, it is assumed */
2027 /* this function will be called with either an IPv4 or IPv6 packet.         */
2028 /* ------------------------------------------------------------------------ */
2029 int
2030 ipf_makefrip(hlen, ip, fin)
2031         int hlen;
2032         ip_t *ip;
2033         fr_info_t *fin;
2034 {
2035         ipf_main_softc_t *softc = fin->fin_main_soft;
2036         int v;
2037
2038         fin->fin_depth = 0;
2039         fin->fin_hlen = (u_short)hlen;
2040         fin->fin_ip = ip;
2041         fin->fin_rule = 0xffffffff;
2042         fin->fin_group[0] = -1;
2043         fin->fin_group[1] = '\0';
2044         fin->fin_dp = (char *)ip + hlen;
2045
2046         v = fin->fin_v;
2047         if (v == 4) {
2048                 fin->fin_plen = ntohs(ip->ip_len);
2049                 fin->fin_dlen = fin->fin_plen - hlen;
2050                 ipf_pr_ipv4hdr(fin);
2051 #ifdef  USE_INET6
2052         } else if (v == 6) {
2053                 fin->fin_plen = ntohs(((ip6_t *)ip)->ip6_plen);
2054                 fin->fin_dlen = fin->fin_plen;
2055                 fin->fin_plen += hlen;
2056
2057                 ipf_pr_ipv6hdr(fin);
2058 #endif
2059         }
2060         if (fin->fin_ip == NULL) {
2061                 LBUMP(ipf_stats[fin->fin_out].fr_ip_freed);
2062                 return -1;
2063         }
2064         return 0;
2065 }
2066
2067
2068 /* ------------------------------------------------------------------------ */
2069 /* Function:    ipf_portcheck                                               */
2070 /* Returns:     int - 1 == port matched, 0 == port match failed             */
2071 /* Parameters:  frp(I) - pointer to port check `expression'                 */
2072 /*              pop(I) - port number to evaluate                            */
2073 /*                                                                          */
2074 /* Perform a comparison of a port number against some other(s), using a     */
2075 /* structure with compare information stored in it.                         */
2076 /* ------------------------------------------------------------------------ */
2077 static INLINE int
2078 ipf_portcheck(frp, pop)
2079         frpcmp_t *frp;
2080         u_32_t pop;
2081 {
2082         int err = 1;
2083         u_32_t po;
2084
2085         po = frp->frp_port;
2086
2087         /*
2088          * Do opposite test to that required and continue if that succeeds.
2089          */
2090         switch (frp->frp_cmp)
2091         {
2092         case FR_EQUAL :
2093                 if (pop != po) /* EQUAL */
2094                         err = 0;
2095                 break;
2096         case FR_NEQUAL :
2097                 if (pop == po) /* NOTEQUAL */
2098                         err = 0;
2099                 break;
2100         case FR_LESST :
2101                 if (pop >= po) /* LESSTHAN */
2102                         err = 0;
2103                 break;
2104         case FR_GREATERT :
2105                 if (pop <= po) /* GREATERTHAN */
2106                         err = 0;
2107                 break;
2108         case FR_LESSTE :
2109                 if (pop > po) /* LT or EQ */
2110                         err = 0;
2111                 break;
2112         case FR_GREATERTE :
2113                 if (pop < po) /* GT or EQ */
2114                         err = 0;
2115                 break;
2116         case FR_OUTRANGE :
2117                 if (pop >= po && pop <= frp->frp_top) /* Out of range */
2118                         err = 0;
2119                 break;
2120         case FR_INRANGE :
2121                 if (pop <= po || pop >= frp->frp_top) /* In range */
2122                         err = 0;
2123                 break;
2124         case FR_INCRANGE :
2125                 if (pop < po || pop > frp->frp_top) /* Inclusive range */
2126                         err = 0;
2127                 break;
2128         default :
2129                 break;
2130         }
2131         return err;
2132 }
2133
2134
2135 /* ------------------------------------------------------------------------ */
2136 /* Function:    ipf_tcpudpchk                                               */
2137 /* Returns:     int - 1 == protocol matched, 0 == check failed              */
2138 /* Parameters:  fda(I) - pointer to packet information                      */
2139 /*              ft(I)  - pointer to structure with comparison data          */
2140 /*                                                                          */
2141 /* Compares the current pcket (assuming it is TCP/UDP) information with a   */
2142 /* structure containing information that we want to match against.          */
2143 /* ------------------------------------------------------------------------ */
2144 int
2145 ipf_tcpudpchk(fi, ft)
2146         fr_ip_t *fi;
2147         frtuc_t *ft;
2148 {
2149         int err = 1;
2150
2151         /*
2152          * Both ports should *always* be in the first fragment.
2153          * So far, I cannot find any cases where they can not be.
2154          *
2155          * compare destination ports
2156          */
2157         if (ft->ftu_dcmp)
2158                 err = ipf_portcheck(&ft->ftu_dst, fi->fi_ports[1]);
2159
2160         /*
2161          * compare source ports
2162          */
2163         if (err && ft->ftu_scmp)
2164                 err = ipf_portcheck(&ft->ftu_src, fi->fi_ports[0]);
2165
2166         /*
2167          * If we don't have all the TCP/UDP header, then how can we
2168          * expect to do any sort of match on it ?  If we were looking for
2169          * TCP flags, then NO match.  If not, then match (which should
2170          * satisfy the "short" class too).
2171          */
2172         if (err && (fi->fi_p == IPPROTO_TCP)) {
2173                 if (fi->fi_flx & FI_SHORT)
2174                         return !(ft->ftu_tcpf | ft->ftu_tcpfm);
2175                 /*
2176                  * Match the flags ?  If not, abort this match.
2177                  */
2178                 if (ft->ftu_tcpfm &&
2179                     ft->ftu_tcpf != (fi->fi_tcpf & ft->ftu_tcpfm)) {
2180                         FR_DEBUG(("f. %#x & %#x != %#x\n", fi->fi_tcpf,
2181                                  ft->ftu_tcpfm, ft->ftu_tcpf));
2182                         err = 0;
2183                 }
2184         }
2185         return err;
2186 }
2187
2188
2189 /* ------------------------------------------------------------------------ */
2190 /* Function:    ipf_check_ipf                                               */
2191 /* Returns:     int - 0 == match, else no match                             */
2192 /* Parameters:  fin(I)     - pointer to packet information                  */
2193 /*              fr(I)      - pointer to filter rule                         */
2194 /*              portcmp(I) - flag indicating whether to attempt matching on */
2195 /*                           TCP/UDP port data.                             */
2196 /*                                                                          */
2197 /* Check to see if a packet matches an IPFilter rule.  Checks of addresses, */
2198 /* port numbers, etc, for "standard" IPFilter rules are all orchestrated in */
2199 /* this function.                                                           */
2200 /* ------------------------------------------------------------------------ */
2201 static INLINE int
2202 ipf_check_ipf(fin, fr, portcmp)
2203         fr_info_t *fin;
2204         frentry_t *fr;
2205         int portcmp;
2206 {
2207         u_32_t  *ld, *lm, *lip;
2208         fripf_t *fri;
2209         fr_ip_t *fi;
2210         int i;
2211
2212         fi = &fin->fin_fi;
2213         fri = fr->fr_ipf;
2214         lip = (u_32_t *)fi;
2215         lm = (u_32_t *)&fri->fri_mip;
2216         ld = (u_32_t *)&fri->fri_ip;
2217
2218         /*
2219          * first 32 bits to check coversion:
2220          * IP version, TOS, TTL, protocol
2221          */
2222         i = ((*lip & *lm) != *ld);
2223         FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
2224                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2225         if (i)
2226                 return 1;
2227
2228         /*
2229          * Next 32 bits is a constructed bitmask indicating which IP options
2230          * are present (if any) in this packet.
2231          */
2232         lip++, lm++, ld++;
2233         i = ((*lip & *lm) != *ld);
2234         FR_DEBUG(("1. %#08x & %#08x != %#08x\n",
2235                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2236         if (i != 0)
2237                 return 1;
2238
2239         lip++, lm++, ld++;
2240         /*
2241          * Unrolled loops (4 each, for 32 bits) for address checks.
2242          */
2243         /*
2244          * Check the source address.
2245          */
2246         if (fr->fr_satype == FRI_LOOKUP) {
2247                 i = (*fr->fr_srcfunc)(fin->fin_main_soft, fr->fr_srcptr,
2248                                       fi->fi_v, lip, fin->fin_plen);
2249                 if (i == -1)
2250                         return 1;
2251                 lip += 3;
2252                 lm += 3;
2253                 ld += 3;
2254         } else {
2255                 i = ((*lip & *lm) != *ld);
2256                 FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
2257                            ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2258                 if (fi->fi_v == 6) {
2259                         lip++, lm++, ld++;
2260                         i |= ((*lip & *lm) != *ld);
2261                         FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
2262                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2263                         lip++, lm++, ld++;
2264                         i |= ((*lip & *lm) != *ld);
2265                         FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
2266                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2267                         lip++, lm++, ld++;
2268                         i |= ((*lip & *lm) != *ld);
2269                         FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
2270                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2271                 } else {
2272                         lip += 3;
2273                         lm += 3;
2274                         ld += 3;
2275                 }
2276         }
2277         i ^= (fr->fr_flags & FR_NOTSRCIP) >> 6;
2278         if (i != 0)
2279                 return 1;
2280
2281         /*
2282          * Check the destination address.
2283          */
2284         lip++, lm++, ld++;
2285         if (fr->fr_datype == FRI_LOOKUP) {
2286                 i = (*fr->fr_dstfunc)(fin->fin_main_soft, fr->fr_dstptr,
2287                                       fi->fi_v, lip, fin->fin_plen);
2288                 if (i == -1)
2289                         return 1;
2290                 lip += 3;
2291                 lm += 3;
2292                 ld += 3;
2293         } else {
2294                 i = ((*lip & *lm) != *ld);
2295                 FR_DEBUG(("3a. %#08x & %#08x != %#08x\n",
2296                            ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2297                 if (fi->fi_v == 6) {
2298                         lip++, lm++, ld++;
2299                         i |= ((*lip & *lm) != *ld);
2300                         FR_DEBUG(("3b. %#08x & %#08x != %#08x\n",
2301                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2302                         lip++, lm++, ld++;
2303                         i |= ((*lip & *lm) != *ld);
2304                         FR_DEBUG(("3c. %#08x & %#08x != %#08x\n",
2305                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2306                         lip++, lm++, ld++;
2307                         i |= ((*lip & *lm) != *ld);
2308                         FR_DEBUG(("3d. %#08x & %#08x != %#08x\n",
2309                                    ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2310                 } else {
2311                         lip += 3;
2312                         lm += 3;
2313                         ld += 3;
2314                 }
2315         }
2316         i ^= (fr->fr_flags & FR_NOTDSTIP) >> 7;
2317         if (i != 0)
2318                 return 1;
2319         /*
2320          * IP addresses matched.  The next 32bits contains:
2321          * mast of old IP header security & authentication bits.
2322          */
2323         lip++, lm++, ld++;
2324         i = (*ld - (*lip & *lm));
2325         FR_DEBUG(("4. %#08x & %#08x != %#08x\n", *lip, *lm, *ld));
2326
2327         /*
2328          * Next we have 32 bits of packet flags.
2329          */
2330         lip++, lm++, ld++;
2331         i |= (*ld - (*lip & *lm));
2332         FR_DEBUG(("5. %#08x & %#08x != %#08x\n", *lip, *lm, *ld));
2333
2334         if (i == 0) {
2335                 /*
2336                  * If a fragment, then only the first has what we're
2337                  * looking for here...
2338                  */
2339                 if (portcmp) {
2340                         if (!ipf_tcpudpchk(&fin->fin_fi, &fr->fr_tuc))
2341                                 i = 1;
2342                 } else {
2343                         if (fr->fr_dcmp || fr->fr_scmp ||
2344                             fr->fr_tcpf || fr->fr_tcpfm)
2345                                 i = 1;
2346                         if (fr->fr_icmpm || fr->fr_icmp) {
2347                                 if (((fi->fi_p != IPPROTO_ICMP) &&
2348                                      (fi->fi_p != IPPROTO_ICMPV6)) ||
2349                                     fin->fin_off || (fin->fin_dlen < 2))
2350                                         i = 1;
2351                                 else if ((fin->fin_data[0] & fr->fr_icmpm) !=
2352                                          fr->fr_icmp) {
2353                                         FR_DEBUG(("i. %#x & %#x != %#x\n",
2354                                                  fin->fin_data[0],
2355                                                  fr->fr_icmpm, fr->fr_icmp));
2356                                         i = 1;
2357                                 }
2358                         }
2359                 }
2360         }
2361         return i;
2362 }
2363
2364
2365 /* ------------------------------------------------------------------------ */
2366 /* Function:    ipf_scanlist                                                */
2367 /* Returns:     int - result flags of scanning filter list                  */
2368 /* Parameters:  fin(I) - pointer to packet information                      */
2369 /*              pass(I) - default result to return for filtering            */
2370 /*                                                                          */
2371 /* Check the input/output list of rules for a match to the current packet.  */
2372 /* If a match is found, the value of fr_flags from the rule becomes the     */
2373 /* return value and fin->fin_fr points to the matched rule.                 */
2374 /*                                                                          */
2375 /* This function may be called recusively upto 16 times (limit inbuilt.)    */
2376 /* When unwinding, it should finish up with fin_depth as 0.                 */
2377 /*                                                                          */
2378 /* Could be per interface, but this gets real nasty when you don't have,    */
2379 /* or can't easily change, the kernel source code to .                      */
2380 /* ------------------------------------------------------------------------ */
2381 int
2382 ipf_scanlist(fin, pass)
2383         fr_info_t *fin;
2384         u_32_t pass;
2385 {
2386         ipf_main_softc_t *softc = fin->fin_main_soft;
2387         int rulen, portcmp, off, skip;
2388         struct frentry *fr, *fnext;
2389         u_32_t passt, passo;
2390
2391         /*
2392          * Do not allow nesting deeper than 16 levels.
2393          */
2394         if (fin->fin_depth >= 16)
2395                 return pass;
2396
2397         fr = fin->fin_fr;
2398
2399         /*
2400          * If there are no rules in this list, return now.
2401          */
2402         if (fr == NULL)
2403                 return pass;
2404
2405         skip = 0;
2406         portcmp = 0;
2407         fin->fin_depth++;
2408         fin->fin_fr = NULL;
2409         off = fin->fin_off;
2410
2411         if ((fin->fin_flx & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
2412                 portcmp = 1;
2413
2414         for (rulen = 0; fr; fr = fnext, rulen++) {
2415                 fnext = fr->fr_next;
2416                 if (skip != 0) {
2417                         FR_VERBOSE(("SKIP %d (%#x)\n", skip, fr->fr_flags));
2418                         skip--;
2419                         continue;
2420                 }
2421
2422                 /*
2423                  * In all checks below, a null (zero) value in the
2424                  * filter struture is taken to mean a wildcard.
2425                  *
2426                  * check that we are working for the right interface
2427                  */
2428 #ifdef  _KERNEL
2429                 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
2430                         continue;
2431 #else
2432                 if (opts & (OPT_VERBOSE|OPT_DEBUG))
2433                         printf("\n");
2434                 FR_VERBOSE(("%c", FR_ISSKIP(pass) ? 's' :
2435                                   FR_ISPASS(pass) ? 'p' :
2436                                   FR_ISACCOUNT(pass) ? 'A' :
2437                                   FR_ISAUTH(pass) ? 'a' :
2438                                   (pass & FR_NOMATCH) ? 'n' :'b'));
2439                 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
2440                         continue;
2441                 FR_VERBOSE((":i"));
2442 #endif
2443
2444                 switch (fr->fr_type)
2445                 {
2446                 case FR_T_IPF :
2447                 case FR_T_IPF_BUILTIN :
2448                         if (ipf_check_ipf(fin, fr, portcmp))
2449                                 continue;
2450                         break;
2451 #if defined(IPFILTER_BPF)
2452                 case FR_T_BPFOPC :
2453                 case FR_T_BPFOPC_BUILTIN :
2454                     {
2455                         u_char *mc;
2456                         int wlen;
2457
2458                         if (*fin->fin_mp == NULL)
2459                                 continue;
2460                         if (fin->fin_family != fr->fr_family)
2461                                 continue;
2462                         mc = (u_char *)fin->fin_m;
2463                         wlen = fin->fin_dlen + fin->fin_hlen;
2464                         if (!bpf_filter(fr->fr_data, mc, wlen, 0))
2465                                 continue;
2466                         break;
2467                     }
2468 #endif
2469                 case FR_T_CALLFUNC_BUILTIN :
2470                     {
2471                         frentry_t *f;
2472
2473                         f = (*fr->fr_func)(fin, &pass);
2474                         if (f != NULL)
2475                                 fr = f;
2476                         else
2477                                 continue;
2478                         break;
2479                     }
2480
2481                 case FR_T_IPFEXPR :
2482                 case FR_T_IPFEXPR_BUILTIN :
2483                         if (fin->fin_family != fr->fr_family)
2484                                 continue;
2485                         if (ipf_fr_matcharray(fin, fr->fr_data) == 0)
2486                                 continue;
2487                         break;
2488
2489                 default :
2490                         break;
2491                 }
2492
2493                 if ((fin->fin_out == 0) && (fr->fr_nattag.ipt_num[0] != 0)) {
2494                         if (fin->fin_nattag == NULL)
2495                                 continue;
2496                         if (ipf_matchtag(&fr->fr_nattag, fin->fin_nattag) == 0)
2497                                 continue;
2498                 }
2499                 FR_VERBOSE(("=%d/%d.%d *", fr->fr_grhead, fr->fr_group, rulen));
2500
2501                 passt = fr->fr_flags;
2502
2503                 /*
2504                  * If the rule is a "call now" rule, then call the function
2505                  * in the rule, if it exists and use the results from that.
2506                  * If the function pointer is bad, just make like we ignore
2507                  * it, except for increasing the hit counter.
2508                  */
2509                 if ((passt & FR_CALLNOW) != 0) {
2510                         frentry_t *frs;
2511
2512                         ATOMIC_INC64(fr->fr_hits);
2513                         if ((fr->fr_func == NULL) ||
2514                             (fr->fr_func == (ipfunc_t)-1))
2515                                 continue;
2516
2517                         frs = fin->fin_fr;
2518                         fin->fin_fr = fr;
2519                         fr = (*fr->fr_func)(fin, &passt);
2520                         if (fr == NULL) {
2521                                 fin->fin_fr = frs;
2522                                 continue;
2523                         }
2524                         passt = fr->fr_flags;
2525                 }
2526                 fin->fin_fr = fr;
2527
2528 #ifdef  IPFILTER_LOG
2529                 /*
2530                  * Just log this packet...
2531                  */
2532                 if ((passt & FR_LOGMASK) == FR_LOG) {
2533                         if (ipf_log_pkt(fin, passt) == -1) {
2534                                 if (passt & FR_LOGORBLOCK) {
2535                                         DT(frb_logfail);
2536                                         passt &= ~FR_CMDMASK;
2537                                         passt |= FR_BLOCK|FR_QUICK;
2538                                         fin->fin_reason = FRB_LOGFAIL;
2539                                 }
2540                         }
2541                 }
2542 #endif /* IPFILTER_LOG */
2543
2544                 MUTEX_ENTER(&fr->fr_lock);
2545                 fr->fr_bytes += (U_QUAD_T)fin->fin_plen;
2546                 fr->fr_hits++;
2547                 MUTEX_EXIT(&fr->fr_lock);
2548                 fin->fin_rule = rulen;
2549
2550                 passo = pass;
2551                 if (FR_ISSKIP(passt)) {
2552                         skip = fr->fr_arg;
2553                         continue;
2554                 } else if (((passt & FR_LOGMASK) != FR_LOG) &&
2555                            ((passt & FR_LOGMASK) != FR_DECAPSULATE)) {
2556                         pass = passt;
2557                 }
2558
2559                 if (passt & (FR_RETICMP|FR_FAKEICMP))
2560                         fin->fin_icode = fr->fr_icode;
2561
2562                 if (fr->fr_group != -1) {
2563                         (void) strncpy(fin->fin_group,
2564                                        FR_NAME(fr, fr_group),
2565                                        strlen(FR_NAME(fr, fr_group)));
2566                 } else {
2567                         fin->fin_group[0] = '\0';
2568                 }
2569
2570                 FR_DEBUG(("pass %#x/%#x/%x\n", passo, pass, passt));
2571
2572                 if (fr->fr_grphead != NULL) {
2573                         fin->fin_fr = fr->fr_grphead->fg_start;
2574                         FR_VERBOSE(("group %s\n", FR_NAME(fr, fr_grhead)));
2575
2576                         if (FR_ISDECAPS(passt))
2577                                 passt = ipf_decaps(fin, pass, fr->fr_icode);
2578                         else
2579                                 passt = ipf_scanlist(fin, pass);
2580
2581                         if (fin->fin_fr == NULL) {
2582                                 fin->fin_rule = rulen;
2583                                 if (fr->fr_group != -1)
2584                                         (void) strncpy(fin->fin_group,
2585                                                        fr->fr_names +
2586                                                        fr->fr_group,
2587                                                        strlen(fr->fr_names +
2588                                                               fr->fr_group));
2589                                 fin->fin_fr = fr;
2590                                 passt = pass;
2591                         }
2592                         pass = passt;
2593                 }
2594
2595                 if (pass & FR_QUICK) {
2596                         /*
2597                          * Finally, if we've asked to track state for this
2598                          * packet, set it up.  Add state for "quick" rules
2599                          * here so that if the action fails we can consider
2600                          * the rule to "not match" and keep on processing
2601                          * filter rules.
2602                          */
2603                         if ((pass & FR_KEEPSTATE) && !FR_ISAUTH(pass) &&
2604                             !(fin->fin_flx & FI_STATE)) {
2605                                 int out = fin->fin_out;
2606
2607                                 fin->fin_fr = fr;
2608                                 if (ipf_state_add(softc, fin, NULL, 0) == 0) {
2609                                         LBUMPD(ipf_stats[out], fr_ads);
2610                                 } else {
2611                                         LBUMPD(ipf_stats[out], fr_bads);
2612                                         pass = passo;
2613                                         continue;
2614                                 }
2615                         }
2616                         break;
2617                 }
2618         }
2619         fin->fin_depth--;
2620         return pass;
2621 }
2622
2623
2624 /* ------------------------------------------------------------------------ */
2625 /* Function:    ipf_acctpkt                                                 */
2626 /* Returns:     frentry_t* - always returns NULL                            */
2627 /* Parameters:  fin(I) - pointer to packet information                      */
2628 /*              passp(IO) - pointer to current/new filter decision (unused) */
2629 /*                                                                          */
2630 /* Checks a packet against accounting rules, if there are any for the given */
2631 /* IP protocol version.                                                     */
2632 /*                                                                          */
2633 /* N.B.: this function returns NULL to match the prototype used by other    */
2634 /* functions called from the IPFilter "mainline" in ipf_check().            */
2635 /* ------------------------------------------------------------------------ */
2636 frentry_t *
2637 ipf_acctpkt(fin, passp)
2638         fr_info_t *fin;
2639         u_32_t *passp;
2640 {
2641         ipf_main_softc_t *softc = fin->fin_main_soft;
2642         char group[FR_GROUPLEN];
2643         frentry_t *fr, *frsave;
2644         u_32_t pass, rulen;
2645
2646         passp = passp;
2647         fr = softc->ipf_acct[fin->fin_out][softc->ipf_active];
2648
2649         if (fr != NULL) {
2650                 frsave = fin->fin_fr;
2651                 bcopy(fin->fin_group, group, FR_GROUPLEN);
2652                 rulen = fin->fin_rule;
2653                 fin->fin_fr = fr;
2654                 pass = ipf_scanlist(fin, FR_NOMATCH);
2655                 if (FR_ISACCOUNT(pass)) {
2656                         LBUMPD(ipf_stats[0], fr_acct);
2657                 }
2658                 fin->fin_fr = frsave;
2659                 bcopy(group, fin->fin_group, FR_GROUPLEN);
2660                 fin->fin_rule = rulen;
2661         }
2662         return NULL;
2663 }
2664
2665
2666 /* ------------------------------------------------------------------------ */
2667 /* Function:    ipf_firewall                                                */
2668 /* Returns:     frentry_t* - returns pointer to matched rule, if no matches */
2669 /*                           were found, returns NULL.                      */
2670 /* Parameters:  fin(I) - pointer to packet information                      */
2671 /*              passp(IO) - pointer to current/new filter decision (unused) */
2672 /*                                                                          */
2673 /* Applies an appropriate set of firewall rules to the packet, to see if    */
2674 /* there are any matches.  The first check is to see if a match can be seen */
2675 /* in the cache.  If not, then search an appropriate list of rules.  Once a */
2676 /* matching rule is found, take any appropriate actions as defined by the   */
2677 /* rule - except logging.                                                   */
2678 /* ------------------------------------------------------------------------ */
2679 static frentry_t *
2680 ipf_firewall(fin, passp)
2681         fr_info_t *fin;
2682         u_32_t *passp;
2683 {
2684         ipf_main_softc_t *softc = fin->fin_main_soft;
2685         frentry_t *fr;
2686         u_32_t pass;
2687         int out;
2688
2689         out = fin->fin_out;
2690         pass = *passp;
2691
2692         /*
2693          * This rule cache will only affect packets that are not being
2694          * statefully filtered.
2695          */
2696         fin->fin_fr = softc->ipf_rules[out][softc->ipf_active];
2697         if (fin->fin_fr != NULL)
2698                 pass = ipf_scanlist(fin, softc->ipf_pass);
2699
2700         if ((pass & FR_NOMATCH)) {
2701                 LBUMPD(ipf_stats[out], fr_nom);
2702         }
2703         fr = fin->fin_fr;
2704
2705         /*
2706          * Apply packets per second rate-limiting to a rule as required.
2707          */
2708         if ((fr != NULL) && (fr->fr_pps != 0) &&
2709             !ppsratecheck(&fr->fr_lastpkt, &fr->fr_curpps, fr->fr_pps)) {
2710                 DT2(frb_ppsrate, fr_info_t *, fin, frentry_t *, fr);
2711                 pass &= ~(FR_CMDMASK|FR_RETICMP|FR_RETRST);
2712                 pass |= FR_BLOCK;
2713                 LBUMPD(ipf_stats[out], fr_ppshit);
2714                 fin->fin_reason = FRB_PPSRATE;
2715         }
2716
2717         /*
2718          * If we fail to add a packet to the authorization queue, then we
2719          * drop the packet later.  However, if it was added then pretend
2720          * we've dropped it already.
2721          */
2722         if (FR_ISAUTH(pass)) {
2723                 if (ipf_auth_new(fin->fin_m, fin) != 0) {
2724                         DT1(frb_authnew, fr_info_t *, fin);
2725                         fin->fin_m = *fin->fin_mp = NULL;
2726                         fin->fin_reason = FRB_AUTHNEW;
2727                         fin->fin_error = 0;
2728                 } else {
2729                         IPFERROR(1);
2730                         fin->fin_error = ENOSPC;
2731                 }
2732         }
2733
2734         if ((fr != NULL) && (fr->fr_func != NULL) &&
2735             (fr->fr_func != (ipfunc_t)-1) && !(pass & FR_CALLNOW))
2736                 (void) (*fr->fr_func)(fin, &pass);
2737
2738         /*
2739          * If a rule is a pre-auth rule, check again in the list of rules
2740          * loaded for authenticated use.  It does not particulary matter
2741          * if this search fails because a "preauth" result, from a rule,
2742          * is treated as "not a pass", hence the packet is blocked.
2743          */
2744         if (FR_ISPREAUTH(pass)) {
2745                 pass = ipf_auth_pre_scanlist(softc, fin, pass);
2746         }
2747
2748         /*
2749          * If the rule has "keep frag" and the packet is actually a fragment,
2750          * then create a fragment state entry.
2751          */
2752         if (pass & FR_KEEPFRAG) {
2753                 if (fin->fin_flx & FI_FRAG) {
2754                         if (ipf_frag_new(softc, fin, pass) == -1) {
2755                                 LBUMP(ipf_stats[out].fr_bnfr);
2756                         } else {
2757                                 LBUMP(ipf_stats[out].fr_nfr);
2758                         }
2759                 } else {
2760                         LBUMP(ipf_stats[out].fr_cfr);
2761                 }
2762         }
2763
2764         fr = fin->fin_fr;
2765         *passp = pass;
2766
2767         return fr;
2768 }
2769
2770
2771 /* ------------------------------------------------------------------------ */
2772 /* Function:    ipf_check                                                   */
2773 /* Returns:     int -  0 == packet allowed through,                         */
2774 /*              User space:                                                 */
2775 /*                    -1 == packet blocked                                  */
2776 /*                     1 == packet not matched                              */
2777 /*                    -2 == requires authentication                         */
2778 /*              Kernel:                                                     */
2779 /*                   > 0 == filter error # for packet                       */
2780 /* Parameters: ctx(I)  - pointer to the instance context                    */
2781 /*             ip(I)   - pointer to start of IPv4/6 packet                  */
2782 /*             hlen(I) - length of header                                   */
2783 /*             ifp(I)  - pointer to interface this packet is on             */
2784 /*             out(I)  - 0 == packet going in, 1 == packet going out        */
2785 /*             mp(IO)  - pointer to caller's buffer pointer that holds this */
2786 /*                       IP packet.                                         */
2787 /* Solaris:                                                                 */
2788 /*             qpi(I)  - pointer to STREAMS queue information for this      */
2789 /*                       interface & direction.                             */
2790 /*                                                                          */
2791 /* ipf_check() is the master function for all IPFilter packet processing.   */
2792 /* It orchestrates: Network Address Translation (NAT), checking for packet  */
2793 /* authorisation (or pre-authorisation), presence of related state info.,   */
2794 /* generating log entries, IP packet accounting, routing of packets as      */
2795 /* directed by firewall rules and of course whether or not to allow the     */
2796 /* packet to be further processed by the kernel.                            */
2797 /*                                                                          */
2798 /* For packets blocked, the contents of "mp" will be NULL'd and the buffer  */
2799 /* freed.  Packets passed may be returned with the pointer pointed to by    */
2800 /* by "mp" changed to a new buffer.                                         */
2801 /* ------------------------------------------------------------------------ */
2802 int
2803 ipf_check(ctx, ip, hlen, ifp, out
2804 #if defined(_KERNEL) && defined(MENTAT)
2805         , qif, mp)
2806         void *qif;
2807 #else
2808         , mp)
2809 #endif
2810         mb_t **mp;
2811         ip_t *ip;
2812         int hlen;
2813         void *ifp;
2814         int out;
2815         void *ctx;
2816 {
2817         /*
2818          * The above really sucks, but short of writing a diff
2819          */
2820         ipf_main_softc_t *softc = ctx;
2821         fr_info_t frinfo;
2822         fr_info_t *fin = &frinfo;
2823         u_32_t pass = softc->ipf_pass;
2824         frentry_t *fr = NULL;
2825         int v = IP_V(ip);
2826         mb_t *mc = NULL;
2827         mb_t *m;
2828         /*
2829          * The first part of ipf_check() deals with making sure that what goes
2830          * into the filtering engine makes some sense.  Information about the
2831          * the packet is distilled, collected into a fr_info_t structure and
2832          * the an attempt to ensure the buffer the packet is in is big enough
2833          * to hold all the required packet headers.
2834          */
2835 #ifdef  _KERNEL
2836 # ifdef MENTAT
2837         qpktinfo_t *qpi = qif;
2838
2839 #  ifdef __sparc
2840         if ((u_int)ip & 0x3)
2841                 return 2;
2842 #  endif
2843 # else
2844         SPL_INT(s);
2845 # endif
2846
2847         if (softc->ipf_running <= 0) {
2848                 return 0;
2849         }
2850
2851         bzero((char *)fin, sizeof(*fin));
2852
2853 # ifdef MENTAT
2854         if (qpi->qpi_flags & QF_BROADCAST)
2855                 fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
2856         if (qpi->qpi_flags & QF_MULTICAST)
2857                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2858         m = qpi->qpi_m;
2859         fin->fin_qfm = m;
2860         fin->fin_qpi = qpi;
2861 # else /* MENTAT */
2862
2863         m = *mp;
2864
2865 #  if defined(M_MCAST)
2866         if ((m->m_flags & M_MCAST) != 0)
2867                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2868 #  endif
2869 #  if defined(M_MLOOP)
2870         if ((m->m_flags & M_MLOOP) != 0)
2871                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2872 #  endif
2873 #  if defined(M_BCAST)
2874         if ((m->m_flags & M_BCAST) != 0)
2875                 fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
2876 #  endif
2877 #  ifdef M_CANFASTFWD
2878         /*
2879          * XXX For now, IP Filter and fast-forwarding of cached flows
2880          * XXX are mutually exclusive.  Eventually, IP Filter should
2881          * XXX get a "can-fast-forward" filter rule.
2882          */
2883         m->m_flags &= ~M_CANFASTFWD;
2884 #  endif /* M_CANFASTFWD */
2885 #  if defined(CSUM_DELAY_DATA) && (!defined(__FreeBSD_version) || \
2886                                    (__FreeBSD_version < 501108))
2887         /*
2888          * disable delayed checksums.
2889          */
2890         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
2891                 in_delayed_cksum(m);
2892                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
2893         }
2894 #  endif /* CSUM_DELAY_DATA */
2895 # endif /* MENTAT */
2896 #else
2897         bzero((char *)fin, sizeof(*fin));
2898         m = *mp;
2899 # if defined(M_MCAST)
2900         if ((m->m_flags & M_MCAST) != 0)
2901                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2902 # endif
2903 # if defined(M_MLOOP)
2904         if ((m->m_flags & M_MLOOP) != 0)
2905                 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2906 # endif
2907 # if defined(M_BCAST)
2908         if ((m->m_flags & M_BCAST) != 0)
2909                 fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
2910 # endif
2911 #endif /* _KERNEL */
2912
2913         fin->fin_v = v;
2914         fin->fin_m = m;
2915         fin->fin_ip = ip;
2916         fin->fin_mp = mp;
2917         fin->fin_out = out;
2918         fin->fin_ifp = ifp;
2919         fin->fin_error = ENETUNREACH;
2920         fin->fin_hlen = (u_short)hlen;
2921         fin->fin_dp = (char *)ip + hlen;
2922         fin->fin_main_soft = softc;
2923
2924         fin->fin_ipoff = (char *)ip - MTOD(m, char *);
2925
2926         SPL_NET(s);
2927
2928 #ifdef  USE_INET6
2929         if (v == 6) {
2930                 LBUMP(ipf_stats[out].fr_ipv6);
2931                 /*
2932                  * Jumbo grams are quite likely too big for internal buffer
2933                  * structures to handle comfortably, for now, so just drop
2934                  * them.
2935                  */
2936                 if (((ip6_t *)ip)->ip6_plen == 0) {
2937                         DT1(frb_jumbo, ip6_t *, (ip6_t *)ip);
2938                         pass = FR_BLOCK|FR_NOMATCH;
2939                         fin->fin_reason = FRB_JUMBO;
2940                         goto finished;
2941                 }
2942                 fin->fin_family = AF_INET6;
2943         } else
2944 #endif
2945         {
2946                 fin->fin_family = AF_INET;
2947         }
2948
2949         if (ipf_makefrip(hlen, ip, fin) == -1) {
2950                 DT1(frb_makefrip, fr_info_t *, fin);
2951                 pass = FR_BLOCK|FR_NOMATCH;
2952                 fin->fin_reason = FRB_MAKEFRIP;
2953                 goto finished;
2954         }
2955
2956         /*
2957          * For at least IPv6 packets, if a m_pullup() fails then this pointer
2958          * becomes NULL and so we have no packet to free.
2959          */
2960         if (*fin->fin_mp == NULL)
2961                 goto finished;
2962
2963         if (!out) {
2964                 if (v == 4) {
2965                         if (softc->ipf_chksrc && !ipf_verifysrc(fin)) {
2966                                 LBUMPD(ipf_stats[0], fr_v4_badsrc);
2967                                 fin->fin_flx |= FI_BADSRC;
2968                         }
2969                         if (fin->fin_ip->ip_ttl < softc->ipf_minttl) {
2970                                 LBUMPD(ipf_stats[0], fr_v4_badttl);
2971                                 fin->fin_flx |= FI_LOWTTL;
2972                         }
2973                 }
2974 #ifdef USE_INET6
2975                 else  if (v == 6) {
2976                         if (((ip6_t *)ip)->ip6_hlim < softc->ipf_minttl) {
2977                                 LBUMPD(ipf_stats[0], fr_v6_badttl);
2978                                 fin->fin_flx |= FI_LOWTTL;
2979                         }
2980                 }
2981 #endif
2982         }
2983
2984         if (fin->fin_flx & FI_SHORT) {
2985                 LBUMPD(ipf_stats[out], fr_short);
2986         }
2987
2988         READ_ENTER(&softc->ipf_mutex);
2989
2990         if (!out) {
2991                 switch (fin->fin_v)
2992                 {
2993                 case 4 :
2994                         if (ipf_nat_checkin(fin, &pass) == -1) {
2995                                 goto filterdone;
2996                         }
2997                         break;
2998 #ifdef USE_INET6
2999                 case 6 :
3000                         if (ipf_nat6_checkin(fin, &pass) == -1) {
3001                                 goto filterdone;
3002                         }
3003                         break;
3004 #endif
3005                 default :
3006                         break;
3007                 }
3008         }
3009         /*
3010          * Check auth now.
3011          * If a packet is found in the auth table, then skip checking
3012          * the access lists for permission but we do need to consider
3013          * the result as if it were from the ACL's.  In addition, being
3014          * found in the auth table means it has been seen before, so do
3015          * not pass it through accounting (again), lest it be counted twice.
3016          */
3017         fr = ipf_auth_check(fin, &pass);
3018         if (!out && (fr == NULL))
3019                 (void) ipf_acctpkt(fin, NULL);
3020
3021         if (fr == NULL) {
3022                 if ((fin->fin_flx & FI_FRAG) != 0)
3023                         fr = ipf_frag_known(fin, &pass);
3024
3025                 if (fr == NULL)
3026                         fr = ipf_state_check(fin, &pass);
3027         }
3028
3029         if ((pass & FR_NOMATCH) || (fr == NULL))
3030                 fr = ipf_firewall(fin, &pass);
3031
3032         /*
3033          * If we've asked to track state for this packet, set it up.
3034          * Here rather than ipf_firewall because ipf_checkauth may decide
3035          * to return a packet for "keep state"
3036          */
3037         if ((pass & FR_KEEPSTATE) && (fin->fin_m != NULL) &&
3038             !(fin->fin_flx & FI_STATE)) {
3039                 if (ipf_state_add(softc, fin, NULL, 0) == 0) {
3040                         LBUMP(ipf_stats[out].fr_ads);
3041                 } else {
3042                         LBUMP(ipf_stats[out].fr_bads);
3043                         if (FR_ISPASS(pass)) {
3044                                 DT(frb_stateadd);
3045                                 pass &= ~FR_CMDMASK;
3046                                 pass |= FR_BLOCK;
3047                                 fin->fin_reason = FRB_STATEADD;
3048                         }
3049                 }
3050         }
3051
3052         fin->fin_fr = fr;
3053         if ((fr != NULL) && !(fin->fin_flx & FI_STATE)) {
3054                 fin->fin_dif = &fr->fr_dif;
3055                 fin->fin_tif = &fr->fr_tifs[fin->fin_rev];
3056         }
3057
3058         /*
3059          * Only count/translate packets which will be passed on, out the
3060          * interface.
3061          */
3062         if (out && FR_ISPASS(pass)) {
3063                 (void) ipf_acctpkt(fin, NULL);
3064
3065                 switch (fin->fin_v)
3066                 {
3067                 case 4 :
3068                         if (ipf_nat_checkout(fin, &pass) == -1) {
3069                                 ;
3070                         } else if ((softc->ipf_update_ipid != 0) && (v == 4)) {
3071                                 if (ipf_updateipid(fin) == -1) {
3072                                         DT(frb_updateipid);
3073                                         LBUMP(ipf_stats[1].fr_ipud);
3074                                         pass &= ~FR_CMDMASK;
3075                                         pass |= FR_BLOCK;
3076                                         fin->fin_reason = FRB_UPDATEIPID;
3077                                 } else {
3078                                         LBUMP(ipf_stats[0].fr_ipud);
3079                                 }
3080                         }
3081                         break;
3082 #ifdef USE_INET6
3083                 case 6 :
3084                         (void) ipf_nat6_checkout(fin, &pass);
3085                         break;
3086 #endif
3087                 default :
3088                         break;
3089                 }
3090         }
3091
3092 filterdone:
3093 #ifdef  IPFILTER_LOG
3094         if ((softc->ipf_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
3095                 (void) ipf_dolog(fin, &pass);
3096         }
3097 #endif
3098
3099         /*
3100          * The FI_STATE flag is cleared here so that calling ipf_state_check
3101          * will work when called from inside of fr_fastroute.  Although
3102          * there is a similar flag, FI_NATED, for NAT, it does have the same
3103          * impact on code execution.
3104          */
3105         fin->fin_flx &= ~FI_STATE;
3106
3107 #if defined(FASTROUTE_RECURSION)
3108         /*
3109          * Up the reference on fr_lock and exit ipf_mutex. The generation of
3110          * a packet below can sometimes cause a recursive call into IPFilter.
3111          * On those platforms where that does happen, we need to hang onto
3112          * the filter rule just in case someone decides to remove or flush it
3113          * in the meantime.
3114          */
3115         if (fr != NULL) {
3116                 MUTEX_ENTER(&fr->fr_lock);
3117                 fr->fr_ref++;
3118                 MUTEX_EXIT(&fr->fr_lock);
3119         }
3120
3121         RWLOCK_EXIT(&softc->ipf_mutex);
3122 #endif
3123
3124         if ((pass & FR_RETMASK) != 0) {
3125                 /*
3126                  * Should we return an ICMP packet to indicate error
3127                  * status passing through the packet filter ?
3128                  * WARNING: ICMP error packets AND TCP RST packets should
3129                  * ONLY be sent in repsonse to incoming packets.  Sending
3130                  * them in response to outbound packets can result in a
3131                  * panic on some operating systems.
3132                  */
3133                 if (!out) {
3134                         if (pass & FR_RETICMP) {
3135                                 int dst;
3136
3137                                 if ((pass & FR_RETMASK) == FR_FAKEICMP)
3138                                         dst = 1;
3139                                 else
3140                                         dst = 0;
3141                                 (void) ipf_send_icmp_err(ICMP_UNREACH, fin,
3142                                                          dst);
3143                                 LBUMP(ipf_stats[0].fr_ret);
3144                         } else if (((pass & FR_RETMASK) == FR_RETRST) &&
3145                                    !(fin->fin_flx & FI_SHORT)) {
3146                                 if (((fin->fin_flx & FI_OOW) != 0) ||
3147                                     (ipf_send_reset(fin) == 0)) {
3148                                         LBUMP(ipf_stats[1].fr_ret);
3149                                 }
3150                         }
3151
3152                         /*
3153                          * When using return-* with auth rules, the auth code
3154                          * takes over disposing of this packet.
3155                          */
3156                         if (FR_ISAUTH(pass) && (fin->fin_m != NULL)) {
3157                                 DT1(frb_authcapture, fr_info_t *, fin);
3158                                 fin->fin_m = *fin->fin_mp = NULL;
3159                                 fin->fin_reason = FRB_AUTHCAPTURE;
3160                                 m = NULL;
3161                         }
3162                 } else {
3163                         if (pass & FR_RETRST) {
3164                                 fin->fin_error = ECONNRESET;
3165                         }
3166                 }
3167         }
3168
3169         /*
3170          * After the above so that ICMP unreachables and TCP RSTs get
3171          * created properly.
3172          */
3173         if (FR_ISBLOCK(pass) && (fin->fin_flx & FI_NEWNAT))
3174                 ipf_nat_uncreate(fin);
3175
3176         /*
3177          * If we didn't drop off the bottom of the list of rules (and thus
3178          * the 'current' rule fr is not NULL), then we may have some extra
3179          * instructions about what to do with a packet.
3180          * Once we're finished return to our caller, freeing the packet if
3181          * we are dropping it.
3182          */
3183         if (fr != NULL) {
3184                 frdest_t *fdp;
3185
3186                 /*
3187                  * Generate a duplicated packet first because ipf_fastroute
3188                  * can lead to fin_m being free'd... not good.
3189                  */
3190                 fdp = fin->fin_dif;
3191                 if ((fdp != NULL) && (fdp->fd_ptr != NULL) &&
3192                     (fdp->fd_ptr != (void *)-1)) {
3193                         mc = M_COPY(fin->fin_m);
3194                         if (mc != NULL)
3195                                 ipf_fastroute(mc, &mc, fin, fdp);
3196                 }
3197
3198                 fdp = fin->fin_tif;
3199                 if (!out && (pass & FR_FASTROUTE)) {
3200                         /*
3201                          * For fastroute rule, no destination interface defined
3202                          * so pass NULL as the frdest_t parameter
3203                          */
3204                         (void) ipf_fastroute(fin->fin_m, mp, fin, NULL);
3205                         m = *mp = NULL;
3206                 } else if ((fdp != NULL) && (fdp->fd_ptr != NULL) &&
3207                            (fdp->fd_ptr != (struct ifnet *)-1)) {
3208                         /* this is for to rules: */
3209                         ipf_fastroute(fin->fin_m, mp, fin, fdp);
3210                         m = *mp = NULL;
3211                 }
3212
3213 #if defined(FASTROUTE_RECURSION)
3214                 (void) ipf_derefrule(softc, &fr);
3215 #endif
3216         }
3217 #if !defined(FASTROUTE_RECURSION)
3218         RWLOCK_EXIT(&softc->ipf_mutex);
3219 #endif
3220
3221 finished:
3222         if (!FR_ISPASS(pass)) {
3223                 LBUMP(ipf_stats[out].fr_block);
3224                 if (*mp != NULL) {
3225 #ifdef _KERNEL
3226                         FREE_MB_T(*mp);
3227 #endif
3228                         m = *mp = NULL;
3229                 }
3230         } else {
3231                 LBUMP(ipf_stats[out].fr_pass);
3232         }
3233
3234         SPL_X(s);
3235
3236 #ifdef _KERNEL
3237         if (FR_ISPASS(pass))
3238                 return 0;
3239         LBUMP(ipf_stats[out].fr_blocked[fin->fin_reason]);
3240         return fin->fin_error;
3241 #else /* _KERNEL */
3242         if (*mp != NULL)
3243                 (*mp)->mb_ifp = fin->fin_ifp;
3244         blockreason = fin->fin_reason;
3245         FR_VERBOSE(("fin_flx %#x pass %#x ", fin->fin_flx, pass));
3246         /*if ((pass & FR_CMDMASK) == (softc->ipf_pass & FR_CMDMASK))*/
3247                 if ((pass & FR_NOMATCH) != 0)
3248                         return 1;
3249
3250         if ((pass & FR_RETMASK) != 0)
3251                 switch (pass & FR_RETMASK)
3252                 {
3253                 case FR_RETRST :
3254                         return 3;
3255                 case FR_RETICMP :
3256                         return 4;
3257                 case FR_FAKEICMP :
3258                         return 5;
3259                 }
3260
3261         switch (pass & FR_CMDMASK)
3262         {
3263         case FR_PASS :
3264                 return 0;
3265         case FR_BLOCK :
3266                 return -1;
3267         case FR_AUTH :
3268                 return -2;
3269         case FR_ACCOUNT :
3270                 return -3;
3271         case FR_PREAUTH :
3272                 return -4;
3273         }
3274         return 2;
3275 #endif /* _KERNEL */
3276 }
3277
3278
3279 #ifdef  IPFILTER_LOG
3280 /* ------------------------------------------------------------------------ */
3281 /* Function:    ipf_dolog                                                   */
3282 /* Returns:     frentry_t* - returns contents of fin_fr (no change made)    */
3283 /* Parameters:  fin(I) - pointer to packet information                      */
3284 /*              passp(IO) - pointer to current/new filter decision (unused) */
3285 /*                                                                          */
3286 /* Checks flags set to see how a packet should be logged, if it is to be    */
3287 /* logged.  Adjust statistics based on its success or not.                  */
3288 /* ------------------------------------------------------------------------ */
3289 frentry_t *
3290 ipf_dolog(fin, passp)
3291         fr_info_t *fin;
3292         u_32_t *passp;
3293 {
3294         ipf_main_softc_t *softc = fin->fin_main_soft;
3295         u_32_t pass;
3296         int out;
3297
3298         out = fin->fin_out;
3299         pass = *passp;
3300
3301         if ((softc->ipf_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
3302                 pass |= FF_LOGNOMATCH;
3303                 LBUMPD(ipf_stats[out], fr_npkl);
3304                 goto logit;
3305
3306         } else if (((pass & FR_LOGMASK) == FR_LOGP) ||
3307             (FR_ISPASS(pass) && (softc->ipf_flags & FF_LOGPASS))) {
3308                 if ((pass & FR_LOGMASK) != FR_LOGP)
3309                         pass |= FF_LOGPASS;
3310                 LBUMPD(ipf_stats[out], fr_ppkl);
3311                 goto logit;
3312
3313         } else if (((pass & FR_LOGMASK) == FR_LOGB) ||
3314                    (FR_ISBLOCK(pass) && (softc->ipf_flags & FF_LOGBLOCK))) {
3315                 if ((pass & FR_LOGMASK) != FR_LOGB)
3316                         pass |= FF_LOGBLOCK;
3317                 LBUMPD(ipf_stats[out], fr_bpkl);
3318
3319 logit:
3320                 if (ipf_log_pkt(fin, pass) == -1) {
3321                         /*
3322                          * If the "or-block" option has been used then
3323                          * block the packet if we failed to log it.
3324                          */
3325                         if ((pass & FR_LOGORBLOCK) && FR_ISPASS(pass)) {
3326                                 DT1(frb_logfail2, u_int, pass);
3327                                 pass &= ~FR_CMDMASK;
3328                                 pass |= FR_BLOCK;
3329                                 fin->fin_reason = FRB_LOGFAIL2;
3330                         }
3331                 }
3332                 *passp = pass;
3333         }
3334
3335         return fin->fin_fr;
3336 }
3337 #endif /* IPFILTER_LOG */
3338
3339
3340 /* ------------------------------------------------------------------------ */
3341 /* Function:    ipf_cksum                                                   */
3342 /* Returns:     u_short - IP header checksum                                */
3343 /* Parameters:  addr(I) - pointer to start of buffer to checksum            */
3344 /*              len(I)  - length of buffer in bytes                         */
3345 /*                                                                          */
3346 /* Calculate the two's complement 16 bit checksum of the buffer passed.     */
3347 /*                                                                          */
3348 /* N.B.: addr should be 16bit aligned.                                      */
3349 /* ------------------------------------------------------------------------ */
3350 u_short
3351 ipf_cksum(addr, len)
3352         u_short *addr;
3353         int len;
3354 {
3355         u_32_t sum = 0;
3356
3357         for (sum = 0; len > 1; len -= 2)
3358                 sum += *addr++;
3359
3360         /* mop up an odd byte, if necessary */
3361         if (len == 1)
3362                 sum += *(u_char *)addr;
3363
3364         /*
3365          * add back carry outs from top 16 bits to low 16 bits
3366          */
3367         sum = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
3368         sum += (sum >> 16);                     /* add carry */
3369         return (u_short)(~sum);
3370 }
3371
3372
3373 /* ------------------------------------------------------------------------ */
3374 /* Function:    fr_cksum                                                    */
3375 /* Returns:     u_short - layer 4 checksum                                  */
3376 /* Parameters:  fin(I)     - pointer to packet information                  */
3377 /*              ip(I)      - pointer to IP header                           */
3378 /*              l4proto(I) - protocol to caclulate checksum for             */
3379 /*              l4hdr(I)   - pointer to layer 4 header                      */
3380 /*                                                                          */
3381 /* Calculates the TCP checksum for the packet held in "m", using the data   */
3382 /* in the IP header "ip" to seed it.                                        */
3383 /*                                                                          */
3384 /* NB: This function assumes we've pullup'd enough for all of the IP header */
3385 /* and the TCP header.  We also assume that data blocks aren't allocated in */
3386 /* odd sizes.                                                               */
3387 /*                                                                          */
3388 /* Expects ip_len and ip_off to be in network byte order when called.       */
3389 /* ------------------------------------------------------------------------ */
3390 u_short
3391 fr_cksum(fin, ip, l4proto, l4hdr)
3392         fr_info_t *fin;
3393         ip_t *ip;
3394         int l4proto;
3395         void *l4hdr;
3396 {
3397         u_short *sp, slen, sumsave, *csump;
3398         u_int sum, sum2;
3399         int hlen;
3400         int off;
3401 #ifdef  USE_INET6
3402         ip6_t *ip6;
3403 #endif
3404
3405         csump = NULL;
3406         sumsave = 0;
3407         sp = NULL;
3408         slen = 0;
3409         hlen = 0;
3410         sum = 0;
3411
3412         sum = htons((u_short)l4proto);
3413         /*
3414          * Add up IP Header portion
3415          */
3416 #ifdef  USE_INET6
3417         if (IP_V(ip) == 4) {
3418 #endif
3419                 hlen = IP_HL(ip) << 2;
3420                 off = hlen;
3421                 sp = (u_short *)&ip->ip_src;
3422                 sum += *sp++;   /* ip_src */
3423                 sum += *sp++;
3424                 sum += *sp++;   /* ip_dst */
3425                 sum += *sp++;
3426 #ifdef  USE_INET6
3427         } else if (IP_V(ip) == 6) {
3428                 ip6 = (ip6_t *)ip;
3429                 hlen = sizeof(*ip6);
3430                 off = ((char *)fin->fin_dp - (char *)fin->fin_ip);
3431                 sp = (u_short *)&ip6->ip6_src;
3432                 sum += *sp++;   /* ip6_src */
3433                 sum += *sp++;
3434                 sum += *sp++;
3435                 sum += *sp++;
3436                 sum += *sp++;
3437                 sum += *sp++;
3438                 sum += *sp++;
3439                 sum += *sp++;
3440                 /* This needs to be routing header aware. */
3441                 sum += *sp++;   /* ip6_dst */
3442                 sum += *sp++;
3443                 sum += *sp++;
3444                 sum += *sp++;
3445                 sum += *sp++;
3446                 sum += *sp++;
3447                 sum += *sp++;
3448                 sum += *sp++;
3449         } else {
3450                 return 0xffff;
3451         }
3452 #endif
3453         slen = fin->fin_plen - off;
3454         sum += htons(slen);
3455
3456         switch (l4proto)
3457         {
3458         case IPPROTO_UDP :
3459                 csump = &((udphdr_t *)l4hdr)->uh_sum;
3460                 break;
3461
3462         case IPPROTO_TCP :
3463                 csump = &((tcphdr_t *)l4hdr)->th_sum;
3464                 break;
3465         case IPPROTO_ICMP :
3466                 csump = &((icmphdr_t *)l4hdr)->icmp_cksum;
3467                 sum = 0;        /* Pseudo-checksum is not included */
3468                 break;
3469 #ifdef USE_INET6
3470         case IPPROTO_ICMPV6 :
3471                 csump = &((struct icmp6_hdr *)l4hdr)->icmp6_cksum;
3472                 break;
3473 #endif
3474         default :
3475                 break;
3476         }
3477
3478         if (csump != NULL) {
3479                 sumsave = *csump;
3480                 *csump = 0;
3481         }
3482
3483         sum2 = ipf_pcksum(fin, off, sum);
3484         if (csump != NULL)
3485                 *csump = sumsave;
3486         return sum2;
3487 }
3488
3489
3490 /* ------------------------------------------------------------------------ */
3491 /* Function:    ipf_findgroup                                               */
3492 /* Returns:     frgroup_t * - NULL = group not found, else pointer to group */
3493 /* Parameters:  softc(I) - pointer to soft context main structure           */
3494 /*              group(I) - group name to search for                         */
3495 /*              unit(I)  - device to which this group belongs               */
3496 /*              set(I)   - which set of rules (inactive/inactive) this is   */
3497 /*              fgpp(O)  - pointer to place to store pointer to the pointer */
3498 /*                         to where to add the next (last) group or where   */
3499 /*                         to delete group from.                            */
3500 /*                                                                          */
3501 /* Search amongst the defined groups for a particular group number.         */
3502 /* ------------------------------------------------------------------------ */
3503 frgroup_t *
3504 ipf_findgroup(softc, group, unit, set, fgpp)
3505         ipf_main_softc_t *softc;
3506         char *group;
3507         minor_t unit;
3508         int set;
3509         frgroup_t ***fgpp;
3510 {
3511         frgroup_t *fg, **fgp;
3512
3513         /*
3514          * Which list of groups to search in is dependent on which list of
3515          * rules are being operated on.
3516          */
3517         fgp = &softc->ipf_groups[unit][set];
3518
3519         while ((fg = *fgp) != NULL) {
3520                 if (strncmp(group, fg->fg_name, FR_GROUPLEN) == 0)
3521                         break;
3522                 else
3523                         fgp = &fg->fg_next;
3524         }
3525         if (fgpp != NULL)
3526                 *fgpp = fgp;
3527         return fg;
3528 }
3529
3530
3531 /* ------------------------------------------------------------------------ */
3532 /* Function:    ipf_group_add                                               */
3533 /* Returns:     frgroup_t * - NULL == did not create group,                 */
3534 /*                            != NULL == pointer to the group               */
3535 /* Parameters:  softc(I) - pointer to soft context main structure           */
3536 /*              num(I)   - group number to add                              */
3537 /*              head(I)  - rule pointer that is using this as the head      */
3538 /*              flags(I) - rule flags which describe the type of rule it is */
3539 /*              unit(I)  - device to which this group will belong to        */
3540 /*              set(I)   - which set of rules (inactive/inactive) this is   */
3541 /* Write Locks: ipf_mutex                                                   */
3542 /*                                                                          */
3543 /* Add a new group head, or if it already exists, increase the reference    */
3544 /* count to it.                                                             */
3545 /* ------------------------------------------------------------------------ */
3546 frgroup_t *
3547 ipf_group_add(softc, group, head, flags, unit, set)
3548         ipf_main_softc_t *softc;
3549         char *group;
3550         void *head;
3551         u_32_t flags;
3552         minor_t unit;
3553         int set;
3554 {
3555         frgroup_t *fg, **fgp;
3556         u_32_t gflags;
3557
3558         if (group == NULL)
3559                 return NULL;
3560
3561         if (unit == IPL_LOGIPF && *group == '\0')
3562                 return NULL;
3563
3564         fgp = NULL;
3565         gflags = flags & FR_INOUT;
3566
3567         fg = ipf_findgroup(softc, group, unit, set, &fgp);
3568         if (fg != NULL) {
3569                 if (fg->fg_head == NULL && head != NULL)
3570                         fg->fg_head = head;
3571                 if (fg->fg_flags == 0)
3572                         fg->fg_flags = gflags;
3573                 else if (gflags != fg->fg_flags)
3574                         return NULL;
3575                 fg->fg_ref++;
3576                 return fg;
3577         }
3578
3579         KMALLOC(fg, frgroup_t *);
3580         if (fg != NULL) {
3581                 fg->fg_head = head;
3582                 fg->fg_start = NULL;
3583                 fg->fg_next = *fgp;
3584                 bcopy(group, fg->fg_name, strlen(group) + 1);
3585                 fg->fg_flags = gflags;
3586                 fg->fg_ref = 1;
3587                 fg->fg_set = &softc->ipf_groups[unit][set];
3588                 *fgp = fg;
3589         }
3590         return fg;
3591 }
3592
3593
3594 /* ------------------------------------------------------------------------ */
3595 /* Function:    ipf_group_del                                               */
3596 /* Returns:     int      - number of rules deleted                          */
3597 /* Parameters:  softc(I) - pointer to soft context main structure           */
3598 /*              group(I) - group name to delete                             */
3599 /*              fr(I)    - filter rule from which group is referenced       */
3600 /* Write Locks: ipf_mutex                                                   */
3601 /*                                                                          */
3602 /* This function is called whenever a reference to a group is to be dropped */
3603 /* and thus its reference count needs to be lowered and the group free'd if */
3604 /* the reference count reaches zero. Passing in fr is really for the sole   */
3605 /* purpose of knowing when the head rule is being deleted.                  */
3606 /* ------------------------------------------------------------------------ */
3607 void
3608 ipf_group_del(softc, group, fr)
3609         ipf_main_softc_t *softc;
3610         frgroup_t *group;
3611         frentry_t *fr;
3612 {
3613
3614         if (group->fg_head == fr)
3615                 group->fg_head = NULL;
3616
3617         group->fg_ref--;
3618         if ((group->fg_ref == 0) && (group->fg_start == NULL))
3619                 ipf_group_free(group);
3620 }
3621
3622
3623 /* ------------------------------------------------------------------------ */
3624 /* Function:    ipf_group_free                                              */
3625 /* Returns:     Nil                                                         */
3626 /* Parameters:  group(I) - pointer to filter rule group                     */
3627 /*                                                                          */
3628 /* Remove the group from the list of groups and free it.                    */
3629 /* ------------------------------------------------------------------------ */
3630 static void
3631 ipf_group_free(group)
3632         frgroup_t *group;
3633 {
3634         frgroup_t **gp;
3635
3636         for (gp = group->fg_set; *gp != NULL; gp = &(*gp)->fg_next) {
3637                 if (*gp == group) {
3638                         *gp = group->fg_next;
3639                         break;
3640                 }
3641         }
3642         KFREE(group);
3643 }
3644
3645
3646 /* ------------------------------------------------------------------------ */
3647 /* Function:    ipf_group_flush                                             */
3648 /* Returns:     int      - number of rules flush from group                 */
3649 /* Parameters:  softc(I) - pointer to soft context main structure           */
3650 /* Parameters:  group(I) - pointer to filter rule group                     */
3651 /*                                                                          */
3652 /* Remove all of the rules that currently are listed under the given group. */
3653 /* ------------------------------------------------------------------------ */
3654 static int
3655 ipf_group_flush(softc, group)
3656         ipf_main_softc_t *softc;
3657         frgroup_t *group;
3658 {
3659         int gone = 0;
3660
3661         (void) ipf_flushlist(softc, &gone, &group->fg_start);
3662
3663         return gone;
3664 }
3665
3666
3667 /* ------------------------------------------------------------------------ */
3668 /* Function:    ipf_getrulen                                                */
3669 /* Returns:     frentry_t * - NULL == not found, else pointer to rule n     */
3670 /* Parameters:  softc(I) - pointer to soft context main structure           */
3671 /* Parameters:  unit(I)  - device for which to count the rule's number      */
3672 /*              flags(I) - which set of rules to find the rule in           */
3673 /*              group(I) - group name                                       */
3674 /*              n(I)     - rule number to find                              */
3675 /*                                                                          */
3676 /* Find rule # n in group # g and return a pointer to it.  Return NULl if   */
3677 /* group # g doesn't exist or there are less than n rules in the group.     */
3678 /* ------------------------------------------------------------------------ */
3679 frentry_t *
3680 ipf_getrulen(softc, unit, group, n)
3681         ipf_main_softc_t *softc;
3682         int unit;
3683         char *group;
3684         u_32_t n;
3685 {
3686         frentry_t *fr;
3687         frgroup_t *fg;
3688
3689         fg = ipf_findgroup(softc, group, unit, softc->ipf_active, NULL);
3690         if (fg == NULL)
3691                 return NULL;
3692         for (fr = fg->fg_start; fr && n; fr = fr->fr_next, n--)
3693                 ;
3694         if (n != 0)
3695                 return NULL;
3696         return fr;
3697 }
3698
3699
3700 /* ------------------------------------------------------------------------ */
3701 /* Function:    ipf_flushlist                                               */
3702 /* Returns:     int - >= 0 - number of flushed rules                        */
3703 /* Parameters:  softc(I)   - pointer to soft context main structure         */
3704 /*              nfreedp(O) - pointer to int where flush count is stored     */
3705 /*              listp(I)   - pointer to list to flush pointer               */
3706 /* Write Locks: ipf_mutex                                                   */
3707 /*                                                                          */
3708 /* Recursively flush rules from the list, descending groups as they are     */
3709 /* encountered.  if a rule is the head of a group and it has lost all its   */
3710 /* group members, then also delete the group reference.  nfreedp is needed  */
3711 /* to store the accumulating count of rules removed, whereas the returned   */
3712 /* value is just the number removed from the current list.  The latter is   */
3713 /* needed to correctly adjust reference counts on rules that define groups. */
3714 /*                                                                          */
3715 /* NOTE: Rules not loaded from user space cannot be flushed.                */
3716 /* ------------------------------------------------------------------------ */
3717 static int
3718 ipf_flushlist(softc, nfreedp, listp)
3719         ipf_main_softc_t *softc;
3720         int *nfreedp;
3721         frentry_t **listp;
3722 {
3723         int freed = 0;
3724         frentry_t *fp;
3725
3726         while ((fp = *listp) != NULL) {
3727                 if ((fp->fr_type & FR_T_BUILTIN) ||
3728                     !(fp->fr_flags & FR_COPIED)) {
3729                         listp = &fp->fr_next;
3730                         continue;
3731                 }
3732                 *listp = fp->fr_next;
3733                 if (fp->fr_next != NULL)
3734                         fp->fr_next->fr_pnext = fp->fr_pnext;
3735                 fp->fr_pnext = NULL;
3736
3737                 if (fp->fr_grphead != NULL) {
3738                         freed += ipf_group_flush(softc, fp->fr_grphead);
3739                         fp->fr_names[fp->fr_grhead] = '\0';
3740                 }
3741
3742                 if (fp->fr_icmpgrp != NULL) {
3743                         freed += ipf_group_flush(softc, fp->fr_icmpgrp);
3744                         fp->fr_names[fp->fr_icmphead] = '\0';
3745                 }
3746
3747                 if (fp->fr_srctrack.ht_max_nodes)
3748                         ipf_rb_ht_flush(&fp->fr_srctrack);
3749
3750                 fp->fr_next = NULL;
3751
3752                 ASSERT(fp->fr_ref > 0);
3753                 if (ipf_derefrule(softc, &fp) == 0)
3754                         freed++;
3755         }
3756         *nfreedp += freed;
3757         return freed;
3758 }
3759
3760
3761 /* ------------------------------------------------------------------------ */
3762 /* Function:    ipf_flush                                                   */
3763 /* Returns:     int - >= 0 - number of flushed rules                        */
3764 /* Parameters:  softc(I) - pointer to soft context main structure           */
3765 /*              unit(I)  - device for which to flush rules                  */
3766 /*              flags(I) - which set of rules to flush                      */
3767 /*                                                                          */
3768 /* Calls flushlist() for all filter rules (accounting, firewall - both IPv4 */
3769 /* and IPv6) as defined by the value of flags.                              */
3770 /* ------------------------------------------------------------------------ */
3771 int
3772 ipf_flush(softc, unit, flags)
3773         ipf_main_softc_t *softc;
3774         minor_t unit;
3775         int flags;
3776 {
3777         int flushed = 0, set;
3778
3779         WRITE_ENTER(&softc->ipf_mutex);
3780
3781         set = softc->ipf_active;
3782         if ((flags & FR_INACTIVE) == FR_INACTIVE)
3783                 set = 1 - set;
3784
3785         if (flags & FR_OUTQUE) {
3786                 ipf_flushlist(softc, &flushed, &softc->ipf_rules[1][set]);
3787                 ipf_flushlist(softc, &flushed, &softc->ipf_acct[1][set]);
3788         }
3789         if (flags & FR_INQUE) {
3790                 ipf_flushlist(softc, &flushed, &softc->ipf_rules[0][set]);
3791                 ipf_flushlist(softc, &flushed, &softc->ipf_acct[0][set]);
3792         }
3793
3794         flushed += ipf_flush_groups(softc, &softc->ipf_groups[unit][set],
3795                                     flags & (FR_INQUE|FR_OUTQUE));
3796
3797         RWLOCK_EXIT(&softc->ipf_mutex);
3798
3799         if (unit == IPL_LOGIPF) {
3800                 int tmp;
3801
3802                 tmp = ipf_flush(softc, IPL_LOGCOUNT, flags);
3803                 if (tmp >= 0)
3804                         flushed += tmp;
3805         }
3806         return flushed;
3807 }
3808
3809
3810 /* ------------------------------------------------------------------------ */
3811 /* Function:    ipf_flush_groups                                            */
3812 /* Returns:     int - >= 0 - number of flushed rules                        */
3813 /* Parameters:  softc(I)  - soft context pointerto work with                */
3814 /*              grhead(I) - pointer to the start of the group list to flush */
3815 /*              flags(I)  - which set of rules to flush                     */
3816 /*                                                                          */
3817 /* Walk through all of the groups under the given group head and remove all */
3818 /* of those that match the flags passed in. The for loop here is bit more   */
3819 /* complicated than usual because the removal of a rule with ipf_derefrule  */
3820 /* may end up removing not only the structure pointed to by "fg" but also   */
3821 /* what is fg_next and fg_next after that. So if a filter rule is actually  */
3822 /* removed from the group then it is necessary to start again.              */
3823 /* ------------------------------------------------------------------------ */
3824 static int
3825 ipf_flush_groups(softc, grhead, flags)
3826         ipf_main_softc_t *softc;
3827         frgroup_t **grhead;
3828         int flags;
3829 {
3830         frentry_t *fr, **frp;
3831         frgroup_t *fg, **fgp;
3832         int flushed = 0;
3833         int removed = 0;
3834
3835         for (fgp = grhead; (fg = *fgp) != NULL; ) {
3836                 while ((fg != NULL) && ((fg->fg_flags & flags) == 0))
3837                         fg = fg->fg_next;
3838                 if (fg == NULL)
3839                         break;
3840                 removed = 0;
3841                 frp = &fg->fg_start;
3842                 while ((removed == 0) && ((fr = *frp) != NULL)) {
3843                         if ((fr->fr_flags & flags) == 0) {
3844                                 frp = &fr->fr_next;
3845                         } else {
3846                                 if (fr->fr_next != NULL)
3847                                         fr->fr_next->fr_pnext = fr->fr_pnext;
3848                                 *frp = fr->fr_next;
3849                                 fr->fr_pnext = NULL;
3850                                 fr->fr_next = NULL;
3851                                 (void) ipf_derefrule(softc, &fr);
3852                                 flushed++;
3853                                 removed++;
3854                         }
3855                 }
3856                 if (removed == 0)
3857                         fgp = &fg->fg_next;
3858         }
3859         return flushed;
3860 }
3861
3862
3863 /* ------------------------------------------------------------------------ */
3864 /* Function:    memstr                                                      */
3865 /* Returns:     char *  - NULL if failed, != NULL pointer to matching bytes */
3866 /* Parameters:  src(I)  - pointer to byte sequence to match                 */
3867 /*              dst(I)  - pointer to byte sequence to search                */
3868 /*              slen(I) - match length                                      */
3869 /*              dlen(I) - length available to search in                     */
3870 /*                                                                          */
3871 /* Search dst for a sequence of bytes matching those at src and extend for  */
3872 /* slen bytes.                                                              */
3873 /* ------------------------------------------------------------------------ */
3874 char *
3875 memstr(src, dst, slen, dlen)
3876         const char *src;
3877         char *dst;
3878         size_t slen, dlen;
3879 {
3880         char *s = NULL;
3881
3882         while (dlen >= slen) {
3883                 if (bcmp(src, dst, slen) == 0) {
3884                         s = dst;
3885                         break;
3886                 }
3887                 dst++;
3888                 dlen--;
3889         }
3890         return s;
3891 }
3892 /* ------------------------------------------------------------------------ */
3893 /* Function:    ipf_fixskip                                                 */
3894 /* Returns:     Nil                                                         */
3895 /* Parameters:  listp(IO)    - pointer to start of list with skip rule      */
3896 /*              rp(I)        - rule added/removed with skip in it.          */
3897 /*              addremove(I) - adjustment (-1/+1) to make to skip count,    */
3898 /*                             depending on whether a rule was just added   */
3899 /*                             or removed.                                  */
3900 /*                                                                          */
3901 /* Adjust all the rules in a list which would have skip'd past the position */
3902 /* where we are inserting to skip to the right place given the change.      */
3903 /* ------------------------------------------------------------------------ */
3904 void
3905 ipf_fixskip(listp, rp, addremove)
3906         frentry_t **listp, *rp;
3907         int addremove;
3908 {
3909         int rules, rn;
3910         frentry_t *fp;
3911
3912         rules = 0;
3913         for (fp = *listp; (fp != NULL) && (fp != rp); fp = fp->fr_next)
3914                 rules++;
3915
3916         if (!fp)
3917                 return;
3918
3919         for (rn = 0, fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
3920                 if (FR_ISSKIP(fp->fr_flags) && (rn + fp->fr_arg >= rules))
3921                         fp->fr_arg += addremove;
3922 }
3923
3924
3925 #ifdef  _KERNEL
3926 /* ------------------------------------------------------------------------ */
3927 /* Function:    count4bits                                                  */
3928 /* Returns:     int - >= 0 - number of consecutive bits in input            */
3929 /* Parameters:  ip(I) - 32bit IP address                                    */
3930 /*                                                                          */
3931 /* IPv4 ONLY                                                                */
3932 /* count consecutive 1's in bit mask.  If the mask generated by counting    */
3933 /* consecutive 1's is different to that passed, return -1, else return #    */
3934 /* of bits.                                                                 */
3935 /* ------------------------------------------------------------------------ */
3936 int
3937 count4bits(ip)
3938         u_32_t  ip;
3939 {
3940         u_32_t  ipn;
3941         int     cnt = 0, i, j;
3942
3943         ip = ipn = ntohl(ip);
3944         for (i = 32; i; i--, ipn *= 2)
3945                 if (ipn & 0x80000000)
3946                         cnt++;
3947                 else
3948                         break;
3949         ipn = 0;
3950         for (i = 32, j = cnt; i; i--, j--) {
3951                 ipn *= 2;
3952                 if (j > 0)
3953                         ipn++;
3954         }
3955         if (ipn == ip)
3956                 return cnt;
3957         return -1;
3958 }
3959
3960
3961 /* ------------------------------------------------------------------------ */
3962 /* Function:    count6bits                                                  */
3963 /* Returns:     int - >= 0 - number of consecutive bits in input            */
3964 /* Parameters:  msk(I) - pointer to start of IPv6 bitmask                   */
3965 /*                                                                          */
3966 /* IPv6 ONLY                                                                */
3967 /* count consecutive 1's in bit mask.                                       */
3968 /* ------------------------------------------------------------------------ */
3969 # ifdef USE_INET6
3970 int
3971 count6bits(msk)
3972         u_32_t *msk;
3973 {
3974         int i = 0, k;
3975         u_32_t j;
3976
3977         for (k = 3; k >= 0; k--)
3978                 if (msk[k] == 0xffffffff)
3979                         i += 32;
3980                 else {
3981                         for (j = msk[k]; j; j <<= 1)
3982                                 if (j & 0x80000000)
3983                                         i++;
3984                 }
3985         return i;
3986 }
3987 # endif
3988 #endif /* _KERNEL */
3989
3990
3991 /* ------------------------------------------------------------------------ */
3992 /* Function:    ipf_synclist                                                */
3993 /* Returns:     int    - 0 = no failures, else indication of first failure  */
3994 /* Parameters:  fr(I)  - start of filter list to sync interface names for   */
3995 /*              ifp(I) - interface pointer for limiting sync lookups        */
3996 /* Write Locks: ipf_mutex                                                   */
3997 /*                                                                          */
3998 /* Walk through a list of filter rules and resolve any interface names into */
3999 /* pointers.  Where dynamic addresses are used, also update the IP address  */
4000 /* used in the rule.  The interface pointer is used to limit the lookups to */
4001 /* a specific set of matching names if it is non-NULL.                      */
4002 /* Errors can occur when resolving the destination name of to/dup-to fields */
4003 /* when the name points to a pool and that pool doest not exist. If this    */
4004 /* does happen then it is necessary to check if there are any lookup refs   */
4005 /* that need to be dropped before returning with an error.                  */
4006 /* ------------------------------------------------------------------------ */
4007 static int
4008 ipf_synclist(softc, fr, ifp)
4009         ipf_main_softc_t *softc;
4010         frentry_t *fr;
4011         void *ifp;
4012 {
4013         frentry_t *frt, *start = fr;
4014         frdest_t *fdp;
4015         char *name;
4016         int error;
4017         void *ifa;
4018         int v, i;
4019
4020         error = 0;
4021
4022         for (; fr; fr = fr->fr_next) {
4023                 if (fr->fr_family == AF_INET)
4024                         v = 4;
4025                 else if (fr->fr_family == AF_INET6)
4026                         v = 6;
4027                 else
4028                         v = 0;
4029
4030                 /*
4031                  * Lookup all the interface names that are part of the rule.
4032                  */
4033                 for (i = 0; i < 4; i++) {
4034                         if ((ifp != NULL) && (fr->fr_ifas[i] != ifp))
4035                                 continue;
4036                         if (fr->fr_ifnames[i] == -1)
4037                                 continue;
4038                         name = FR_NAME(fr, fr_ifnames[i]);
4039                         fr->fr_ifas[i] = ipf_resolvenic(softc, name, v);
4040                 }
4041
4042                 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) {
4043                         if (fr->fr_satype != FRI_NORMAL &&
4044                             fr->fr_satype != FRI_LOOKUP) {
4045                                 ifa = ipf_resolvenic(softc, fr->fr_names +
4046                                                      fr->fr_sifpidx, v);
4047                                 ipf_ifpaddr(softc, v, fr->fr_satype, ifa,
4048                                             &fr->fr_src6, &fr->fr_smsk6);
4049                         }
4050                         if (fr->fr_datype != FRI_NORMAL &&
4051                             fr->fr_datype != FRI_LOOKUP) {
4052                                 ifa = ipf_resolvenic(softc, fr->fr_names +
4053                                                      fr->fr_sifpidx, v);
4054                                 ipf_ifpaddr(softc, v, fr->fr_datype, ifa,
4055                                             &fr->fr_dst6, &fr->fr_dmsk6);
4056                         }
4057                 }
4058
4059                 fdp = &fr->fr_tifs[0];
4060                 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4061                         error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4062                         if (error != 0)
4063                                 goto unwind;
4064                 }
4065
4066                 fdp = &fr->fr_tifs[1];
4067                 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4068                         error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4069                         if (error != 0)
4070                                 goto unwind;
4071                 }
4072
4073                 fdp = &fr->fr_dif;
4074                 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4075                         error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4076                         if (error != 0)
4077                                 goto unwind;
4078                 }
4079
4080                 if (((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4081                     (fr->fr_satype == FRI_LOOKUP) && (fr->fr_srcptr == NULL)) {
4082                         fr->fr_srcptr = ipf_lookup_res_num(softc,
4083                                                            fr->fr_srctype,
4084                                                            IPL_LOGIPF,
4085                                                            fr->fr_srcnum,
4086                                                            &fr->fr_srcfunc);
4087                 }
4088                 if (((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4089                     (fr->fr_datype == FRI_LOOKUP) && (fr->fr_dstptr == NULL)) {
4090                         fr->fr_dstptr = ipf_lookup_res_num(softc,
4091                                                            fr->fr_dsttype,
4092                                                            IPL_LOGIPF,
4093                                                            fr->fr_dstnum,
4094                                                            &fr->fr_dstfunc);
4095                 }
4096         }
4097         return 0;
4098
4099 unwind:
4100         for (frt = start; frt != fr; fr = fr->fr_next) {
4101                 if (((frt->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4102                     (frt->fr_satype == FRI_LOOKUP) && (frt->fr_srcptr != NULL))
4103                                 ipf_lookup_deref(softc, frt->fr_srctype,
4104                                                  frt->fr_srcptr);
4105                 if (((frt->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4106                     (frt->fr_datype == FRI_LOOKUP) && (frt->fr_dstptr != NULL))
4107                                 ipf_lookup_deref(softc, frt->fr_dsttype,
4108                                                  frt->fr_dstptr);
4109         }
4110         return error;
4111 }
4112
4113
4114 /* ------------------------------------------------------------------------ */
4115 /* Function:    ipf_sync                                                    */
4116 /* Returns:     void                                                        */
4117 /* Parameters:  Nil                                                         */
4118 /*                                                                          */
4119 /* ipf_sync() is called when we suspect that the interface list or          */
4120 /* information about interfaces (like IP#) has changed.  Go through all     */
4121 /* filter rules, NAT entries and the state table and check if anything      */
4122 /* needs to be changed/updated.                                             */
4123 /* ------------------------------------------------------------------------ */
4124 int
4125 ipf_sync(softc, ifp)
4126         ipf_main_softc_t *softc;
4127         void *ifp;
4128 {
4129         int i;
4130
4131 # if !SOLARIS
4132         ipf_nat_sync(softc, ifp);
4133         ipf_state_sync(softc, ifp);
4134         ipf_lookup_sync(softc, ifp);
4135 # endif
4136
4137         WRITE_ENTER(&softc->ipf_mutex);
4138         (void) ipf_synclist(softc, softc->ipf_acct[0][softc->ipf_active], ifp);
4139         (void) ipf_synclist(softc, softc->ipf_acct[1][softc->ipf_active], ifp);
4140         (void) ipf_synclist(softc, softc->ipf_rules[0][softc->ipf_active], ifp);
4141         (void) ipf_synclist(softc, softc->ipf_rules[1][softc->ipf_active], ifp);
4142
4143         for (i = 0; i < IPL_LOGSIZE; i++) {
4144                 frgroup_t *g;
4145
4146                 for (g = softc->ipf_groups[i][0]; g != NULL; g = g->fg_next)
4147                         (void) ipf_synclist(softc, g->fg_start, ifp);
4148                 for (g = softc->ipf_groups[i][1]; g != NULL; g = g->fg_next)
4149                         (void) ipf_synclist(softc, g->fg_start, ifp);
4150         }
4151         RWLOCK_EXIT(&softc->ipf_mutex);
4152
4153         return 0;
4154 }
4155
4156
4157 /*
4158  * In the functions below, bcopy() is called because the pointer being
4159  * copied _from_ in this instance is a pointer to a char buf (which could
4160  * end up being unaligned) and on the kernel's local stack.
4161  */
4162 /* ------------------------------------------------------------------------ */
4163 /* Function:    copyinptr                                                   */
4164 /* Returns:     int - 0 = success, else failure                             */
4165 /* Parameters:  src(I)  - pointer to the source address                     */
4166 /*              dst(I)  - destination address                               */
4167 /*              size(I) - number of bytes to copy                           */
4168 /*                                                                          */
4169 /* Copy a block of data in from user space, given a pointer to the pointer  */
4170 /* to start copying from (src) and a pointer to where to store it (dst).    */
4171 /* NB: src - pointer to user space pointer, dst - kernel space pointer      */
4172 /* ------------------------------------------------------------------------ */
4173 int
4174 copyinptr(softc, src, dst, size)
4175         ipf_main_softc_t *softc;
4176         void *src, *dst;
4177         size_t size;
4178 {
4179         caddr_t ca;
4180         int error;
4181
4182 # if SOLARIS
4183         error = COPYIN(src, &ca, sizeof(ca));
4184         if (error != 0)
4185                 return error;
4186 # else
4187         bcopy(src, (caddr_t)&ca, sizeof(ca));
4188 # endif
4189         error = COPYIN(ca, dst, size);
4190         if (error != 0) {
4191                 IPFERROR(3);
4192                 error = EFAULT;
4193         }
4194         return error;
4195 }
4196
4197
4198 /* ------------------------------------------------------------------------ */
4199 /* Function:    copyoutptr                                                  */
4200 /* Returns:     int - 0 = success, else failure                             */
4201 /* Parameters:  src(I)  - pointer to the source address                     */
4202 /*              dst(I)  - destination address                               */
4203 /*              size(I) - number of bytes to copy                           */
4204 /*                                                                          */
4205 /* Copy a block of data out to user space, given a pointer to the pointer   */
4206 /* to start copying from (src) and a pointer to where to store it (dst).    */
4207 /* NB: src - kernel space pointer, dst - pointer to user space pointer.     */
4208 /* ------------------------------------------------------------------------ */
4209 int
4210 copyoutptr(softc, src, dst, size)
4211         ipf_main_softc_t *softc;
4212         void *src, *dst;
4213         size_t size;
4214 {
4215         caddr_t ca;
4216         int error;
4217
4218         bcopy(dst, (caddr_t)&ca, sizeof(ca));
4219         error = COPYOUT(src, ca, size);
4220         if (error != 0) {
4221                 IPFERROR(4);
4222                 error = EFAULT;
4223         }
4224         return error;
4225 }
4226
4227
4228 /* ------------------------------------------------------------------------ */
4229 /* Function:    ipf_lock                                                    */
4230 /* Returns:     int      - 0 = success, else error                          */
4231 /* Parameters:  data(I)  - pointer to lock value to set                     */
4232 /*              lockp(O) - pointer to location to store old lock value      */
4233 /*                                                                          */
4234 /* Get the new value for the lock integer, set it and return the old value  */
4235 /* in *lockp.                                                               */
4236 /* ------------------------------------------------------------------------ */
4237 int
4238 ipf_lock(data, lockp)
4239         caddr_t data;
4240         int *lockp;
4241 {
4242         int arg, err;
4243
4244         err = BCOPYIN(data, &arg, sizeof(arg));
4245         if (err != 0)
4246                 return EFAULT;
4247         err = BCOPYOUT(lockp, data, sizeof(*lockp));
4248         if (err != 0)
4249                 return EFAULT;
4250         *lockp = arg;
4251         return 0;
4252 }
4253
4254
4255 /* ------------------------------------------------------------------------ */
4256 /* Function:    ipf_getstat                                                 */
4257 /* Returns:     Nil                                                         */
4258 /* Parameters:  softc(I) - pointer to soft context main structure           */
4259 /*              fiop(I)  - pointer to ipfilter stats structure              */
4260 /*              rev(I)   - version claim by program doing ioctl             */
4261 /*                                                                          */
4262 /* Stores a copy of current pointers, counters, etc, in the friostat        */
4263 /* structure.                                                               */
4264 /* If IPFILTER_COMPAT is compiled, we pretend to be whatever version the    */
4265 /* program is looking for. This ensure that validation of the version it    */
4266 /* expects will always succeed. Thus kernels with IPFILTER_COMPAT will      */
4267 /* allow older binaries to work but kernels without it will not.            */
4268 /* ------------------------------------------------------------------------ */
4269 /*ARGSUSED*/
4270 static void
4271 ipf_getstat(softc, fiop, rev)
4272         ipf_main_softc_t *softc;
4273         friostat_t *fiop;
4274         int rev;
4275 {
4276         int i;
4277
4278         bcopy((char *)softc->ipf_stats, (char *)fiop->f_st,
4279               sizeof(ipf_statistics_t) * 2);
4280         fiop->f_locks[IPL_LOGSTATE] = -1;
4281         fiop->f_locks[IPL_LOGNAT] = -1;
4282         fiop->f_locks[IPL_LOGIPF] = -1;
4283         fiop->f_locks[IPL_LOGAUTH] = -1;
4284
4285         fiop->f_ipf[0][0] = softc->ipf_rules[0][0];
4286         fiop->f_acct[0][0] = softc->ipf_acct[0][0];
4287         fiop->f_ipf[0][1] = softc->ipf_rules[0][1];
4288         fiop->f_acct[0][1] = softc->ipf_acct[0][1];
4289         fiop->f_ipf[1][0] = softc->ipf_rules[1][0];
4290         fiop->f_acct[1][0] = softc->ipf_acct[1][0];
4291         fiop->f_ipf[1][1] = softc->ipf_rules[1][1];
4292         fiop->f_acct[1][1] = softc->ipf_acct[1][1];
4293
4294         fiop->f_ticks = softc->ipf_ticks;
4295         fiop->f_active = softc->ipf_active;
4296         fiop->f_froute[0] = softc->ipf_frouteok[0];
4297         fiop->f_froute[1] = softc->ipf_frouteok[1];
4298         fiop->f_rb_no_mem = softc->ipf_rb_no_mem;
4299         fiop->f_rb_node_max = softc->ipf_rb_node_max;
4300
4301         fiop->f_running = softc->ipf_running;
4302         for (i = 0; i < IPL_LOGSIZE; i++) {
4303                 fiop->f_groups[i][0] = softc->ipf_groups[i][0];
4304                 fiop->f_groups[i][1] = softc->ipf_groups[i][1];
4305         }
4306 #ifdef  IPFILTER_LOG
4307         fiop->f_log_ok = ipf_log_logok(softc, IPL_LOGIPF);
4308         fiop->f_log_fail = ipf_log_failures(softc, IPL_LOGIPF);
4309         fiop->f_logging = 1;
4310 #else
4311         fiop->f_log_ok = 0;
4312         fiop->f_log_fail = 0;
4313         fiop->f_logging = 0;
4314 #endif
4315         fiop->f_defpass = softc->ipf_pass;
4316         fiop->f_features = ipf_features;
4317
4318 #ifdef IPFILTER_COMPAT
4319         sprintf(fiop->f_version, "IP Filter: v%d.%d.%d",
4320                 (rev / 1000000) % 100,
4321                 (rev / 10000) % 100,
4322                 (rev / 100) % 100);
4323 #else
4324         rev = rev;
4325         (void) strncpy(fiop->f_version, ipfilter_version,
4326                        sizeof(fiop->f_version));
4327 #endif
4328 }
4329
4330
4331 #ifdef  USE_INET6
4332 int icmptoicmp6types[ICMP_MAXTYPE+1] = {
4333         ICMP6_ECHO_REPLY,       /* 0: ICMP_ECHOREPLY */
4334         -1,                     /* 1: UNUSED */
4335         -1,                     /* 2: UNUSED */
4336         ICMP6_DST_UNREACH,      /* 3: ICMP_UNREACH */
4337         -1,                     /* 4: ICMP_SOURCEQUENCH */
4338         ND_REDIRECT,            /* 5: ICMP_REDIRECT */
4339         -1,                     /* 6: UNUSED */
4340         -1,                     /* 7: UNUSED */
4341         ICMP6_ECHO_REQUEST,     /* 8: ICMP_ECHO */
4342         -1,                     /* 9: UNUSED */
4343         -1,                     /* 10: UNUSED */
4344         ICMP6_TIME_EXCEEDED,    /* 11: ICMP_TIMXCEED */
4345         ICMP6_PARAM_PROB,       /* 12: ICMP_PARAMPROB */
4346         -1,                     /* 13: ICMP_TSTAMP */
4347         -1,                     /* 14: ICMP_TSTAMPREPLY */
4348         -1,                     /* 15: ICMP_IREQ */
4349         -1,                     /* 16: ICMP_IREQREPLY */
4350         -1,                     /* 17: ICMP_MASKREQ */
4351         -1,                     /* 18: ICMP_MASKREPLY */
4352 };
4353
4354
4355 int     icmptoicmp6unreach[ICMP_MAX_UNREACH] = {
4356         ICMP6_DST_UNREACH_ADDR,         /* 0: ICMP_UNREACH_NET */
4357         ICMP6_DST_UNREACH_ADDR,         /* 1: ICMP_UNREACH_HOST */
4358         -1,                             /* 2: ICMP_UNREACH_PROTOCOL */
4359         ICMP6_DST_UNREACH_NOPORT,       /* 3: ICMP_UNREACH_PORT */
4360         -1,                             /* 4: ICMP_UNREACH_NEEDFRAG */
4361         ICMP6_DST_UNREACH_NOTNEIGHBOR,  /* 5: ICMP_UNREACH_SRCFAIL */
4362         ICMP6_DST_UNREACH_ADDR,         /* 6: ICMP_UNREACH_NET_UNKNOWN */
4363         ICMP6_DST_UNREACH_ADDR,         /* 7: ICMP_UNREACH_HOST_UNKNOWN */
4364         -1,                             /* 8: ICMP_UNREACH_ISOLATED */
4365         ICMP6_DST_UNREACH_ADMIN,        /* 9: ICMP_UNREACH_NET_PROHIB */
4366         ICMP6_DST_UNREACH_ADMIN,        /* 10: ICMP_UNREACH_HOST_PROHIB */
4367         -1,                             /* 11: ICMP_UNREACH_TOSNET */
4368         -1,                             /* 12: ICMP_UNREACH_TOSHOST */
4369         ICMP6_DST_UNREACH_ADMIN,        /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */
4370 };
4371 int     icmpreplytype6[ICMP6_MAXTYPE + 1];
4372 #endif
4373
4374 int     icmpreplytype4[ICMP_MAXTYPE + 1];
4375
4376
4377 /* ------------------------------------------------------------------------ */
4378 /* Function:    ipf_matchicmpqueryreply                                     */
4379 /* Returns:     int - 1 if "icmp" is a valid reply to "ic" else 0.          */
4380 /* Parameters:  v(I)    - IP protocol version (4 or 6)                      */
4381 /*              ic(I)   - ICMP information                                  */
4382 /*              icmp(I) - ICMP packet header                                */
4383 /*              rev(I)  - direction (0 = forward/1 = reverse) of packet     */
4384 /*                                                                          */
4385 /* Check if the ICMP packet defined by the header pointed to by icmp is a   */
4386 /* reply to one as described by what's in ic.  If it is a match, return 1,  */
4387 /* else return 0 for no match.                                              */
4388 /* ------------------------------------------------------------------------ */
4389 int
4390 ipf_matchicmpqueryreply(v, ic, icmp, rev)
4391         int v;
4392         icmpinfo_t *ic;
4393         icmphdr_t *icmp;
4394         int rev;
4395 {
4396         int ictype;
4397
4398         ictype = ic->ici_type;
4399
4400         if (v == 4) {
4401                 /*
4402                  * If we matched its type on the way in, then when going out
4403                  * it will still be the same type.
4404                  */
4405                 if ((!rev && (icmp->icmp_type == ictype)) ||
4406                     (rev && (icmpreplytype4[ictype] == icmp->icmp_type))) {
4407                         if (icmp->icmp_type != ICMP_ECHOREPLY)
4408                                 return 1;
4409                         if (icmp->icmp_id == ic->ici_id)
4410                                 return 1;
4411                 }
4412         }
4413 #ifdef  USE_INET6
4414         else if (v == 6) {
4415                 if ((!rev && (icmp->icmp_type == ictype)) ||
4416                     (rev && (icmpreplytype6[ictype] == icmp->icmp_type))) {
4417                         if (icmp->icmp_type != ICMP6_ECHO_REPLY)
4418                                 return 1;
4419                         if (icmp->icmp_id == ic->ici_id)
4420                                 return 1;
4421                 }
4422         }
4423 #endif
4424         return 0;
4425 }
4426
4427
4428 /* ------------------------------------------------------------------------ */
4429 /* Function:    ipf_rule_compare                                            */
4430 /* Parameters:  fr1(I) - first rule structure to compare                    */
4431 /*              fr2(I) - second rule structure to compare                   */
4432 /* Returns:     int    - 0 == rules are the same, else mismatch             */
4433 /*                                                                          */
4434 /* Compare two rules and return 0 if they match or a number indicating      */
4435 /* which of the individual checks failed.                                   */
4436 /* ------------------------------------------------------------------------ */
4437 static int
4438 ipf_rule_compare(frentry_t *fr1, frentry_t *fr2)
4439 {
4440         if (fr1->fr_cksum != fr2->fr_cksum)
4441                 return 1;
4442         if (fr1->fr_size != fr2->fr_size)
4443                 return 2;
4444         if (fr1->fr_dsize != fr2->fr_dsize)
4445                 return 3;
4446         if (bcmp((char *)&fr1->fr_func, (char *)&fr2->fr_func,
4447                  fr1->fr_size - offsetof(struct frentry, fr_func)) != 0)
4448                 return 4;
4449         if (fr1->fr_data && !fr2->fr_data)
4450                 return 5;
4451         if (!fr1->fr_data && fr2->fr_data)
4452                 return 6;
4453         if (fr1->fr_data) {
4454                 if (bcmp(fr1->fr_caddr, fr2->fr_caddr, fr1->fr_dsize))
4455                         return 7;
4456         }
4457         return 0;
4458 }
4459
4460
4461 /* ------------------------------------------------------------------------ */
4462 /* Function:    frrequest                                                   */
4463 /* Returns:     int - 0 == success, > 0 == errno value                      */
4464 /* Parameters:  unit(I)     - device for which this is for                  */
4465 /*              req(I)      - ioctl command (SIOC*)                         */
4466 /*              data(I)     - pointr to ioctl data                          */
4467 /*              set(I)      - 1 or 0 (filter set)                           */
4468 /*              makecopy(I) - flag indicating whether data points to a rule */
4469 /*                            in kernel space & hence doesn't need copying. */
4470 /*                                                                          */
4471 /* This function handles all the requests which operate on the list of      */
4472 /* filter rules.  This includes adding, deleting, insertion.  It is also    */
4473 /* responsible for creating groups when a "head" rule is loaded.  Interface */
4474 /* names are resolved here and other sanity checks are made on the content  */
4475 /* of the rule structure being loaded.  If a rule has user defined timeouts */
4476 /* then make sure they are created and initialised before exiting.          */
4477 /* ------------------------------------------------------------------------ */
4478 int
4479 frrequest(softc, unit, req, data, set, makecopy)
4480         ipf_main_softc_t *softc;
4481         int unit;
4482         ioctlcmd_t req;
4483         int set, makecopy;
4484         caddr_t data;
4485 {
4486         int error = 0, in, family, addrem, need_free = 0;
4487         frentry_t frd, *fp, *f, **fprev, **ftail;
4488         void *ptr, *uptr, *cptr;
4489         u_int *p, *pp;
4490         frgroup_t *fg;
4491         char *group;
4492
4493         ptr = NULL;
4494         cptr = NULL;
4495         fg = NULL;
4496         fp = &frd;
4497         if (makecopy != 0) {
4498                 bzero(fp, sizeof(frd));
4499                 error = ipf_inobj(softc, data, NULL, fp, IPFOBJ_FRENTRY);
4500                 if (error) {
4501                         return error;
4502                 }
4503                 if ((fp->fr_type & FR_T_BUILTIN) != 0) {
4504                         IPFERROR(6);
4505                         return EINVAL;
4506                 }
4507                 KMALLOCS(f, frentry_t *, fp->fr_size);
4508                 if (f == NULL) {
4509                         IPFERROR(131);
4510                         return ENOMEM;
4511                 }
4512                 bzero(f, fp->fr_size);
4513                 error = ipf_inobjsz(softc, data, f, IPFOBJ_FRENTRY,
4514                                     fp->fr_size);
4515                 if (error) {
4516                         KFREES(f, fp->fr_size);
4517                         return error;
4518                 }
4519
4520                 fp = f;
4521                 f = NULL;
4522                 fp->fr_next = NULL;
4523                 fp->fr_dnext = NULL;
4524                 fp->fr_pnext = NULL;
4525                 fp->fr_pdnext = NULL;
4526                 fp->fr_grp = NULL;
4527                 fp->fr_grphead = NULL;
4528                 fp->fr_icmpgrp = NULL;
4529                 fp->fr_isc = (void *)-1;
4530                 fp->fr_ptr = NULL;
4531                 fp->fr_ref = 0;
4532                 fp->fr_flags |= FR_COPIED;
4533         } else {
4534                 fp = (frentry_t *)data;
4535                 if ((fp->fr_type & FR_T_BUILTIN) == 0) {
4536                         IPFERROR(7);
4537                         return EINVAL;
4538                 }
4539                 fp->fr_flags &= ~FR_COPIED;
4540         }
4541
4542         if (((fp->fr_dsize == 0) && (fp->fr_data != NULL)) ||
4543             ((fp->fr_dsize != 0) && (fp->fr_data == NULL))) {
4544                 IPFERROR(8);
4545                 error = EINVAL;
4546                 goto donenolock;
4547         }
4548
4549         family = fp->fr_family;
4550         uptr = fp->fr_data;
4551
4552         if (req == (ioctlcmd_t)SIOCINAFR || req == (ioctlcmd_t)SIOCINIFR ||
4553             req == (ioctlcmd_t)SIOCADAFR || req == (ioctlcmd_t)SIOCADIFR)
4554                 addrem = 0;
4555         else if (req == (ioctlcmd_t)SIOCRMAFR || req == (ioctlcmd_t)SIOCRMIFR)
4556                 addrem = 1;
4557         else if (req == (ioctlcmd_t)SIOCZRLST)
4558                 addrem = 2;
4559         else {
4560                 IPFERROR(9);
4561                 error = EINVAL;
4562                 goto donenolock;
4563         }
4564
4565         /*
4566          * Only filter rules for IPv4 or IPv6 are accepted.
4567          */
4568         if (family == AF_INET) {
4569                 /*EMPTY*/;
4570 #ifdef  USE_INET6
4571         } else if (family == AF_INET6) {
4572                 /*EMPTY*/;
4573 #endif
4574         } else if (family != 0) {
4575                 IPFERROR(10);
4576                 error = EINVAL;
4577                 goto donenolock;
4578         }
4579
4580         /*
4581          * If the rule is being loaded from user space, i.e. we had to copy it
4582          * into kernel space, then do not trust the function pointer in the
4583          * rule.
4584          */
4585         if ((makecopy == 1) && (fp->fr_func != NULL)) {
4586                 if (ipf_findfunc(fp->fr_func) == NULL) {
4587                         IPFERROR(11);
4588                         error = ESRCH;
4589                         goto donenolock;
4590                 }
4591
4592                 if (addrem == 0) {
4593                         error = ipf_funcinit(softc, fp);
4594                         if (error != 0)
4595                                 goto donenolock;
4596                 }
4597         }
4598         if ((fp->fr_flags & FR_CALLNOW) &&
4599             ((fp->fr_func == NULL) || (fp->fr_func == (ipfunc_t)-1))) {
4600                 IPFERROR(142);
4601                 error = ESRCH;
4602                 goto donenolock;
4603         }
4604         if (((fp->fr_flags & FR_CMDMASK) == FR_CALL) &&
4605             ((fp->fr_func == NULL) || (fp->fr_func == (ipfunc_t)-1))) {
4606                 IPFERROR(143);
4607                 error = ESRCH;
4608                 goto donenolock;
4609         }
4610
4611         ptr = NULL;
4612         cptr = NULL;
4613
4614         if (FR_ISACCOUNT(fp->fr_flags))
4615                 unit = IPL_LOGCOUNT;
4616
4617         /*
4618          * Check that each group name in the rule has a start index that
4619          * is valid.
4620          */
4621         if (fp->fr_icmphead != -1) {
4622                 if ((fp->fr_icmphead < 0) ||
4623                     (fp->fr_icmphead >= fp->fr_namelen)) {
4624                         IPFERROR(136);
4625                         error = EINVAL;
4626                         goto donenolock;
4627                 }
4628                 if (!strcmp(FR_NAME(fp, fr_icmphead), "0"))
4629                         fp->fr_names[fp->fr_icmphead] = '\0';
4630         }
4631
4632         if (fp->fr_grhead != -1) {
4633                 if ((fp->fr_grhead < 0) ||
4634                     (fp->fr_grhead >= fp->fr_namelen)) {
4635                         IPFERROR(137);
4636                         error = EINVAL;
4637                         goto donenolock;
4638                 }
4639                 if (!strcmp(FR_NAME(fp, fr_grhead), "0"))
4640                         fp->fr_names[fp->fr_grhead] = '\0';
4641         }
4642
4643         if (fp->fr_group != -1) {
4644                 if ((fp->fr_group < 0) ||
4645                     (fp->fr_group >= fp->fr_namelen)) {
4646                         IPFERROR(138);
4647                         error = EINVAL;
4648                         goto donenolock;
4649                 }
4650                 if ((req != (int)SIOCZRLST) && (fp->fr_group != -1)) {
4651                         /*
4652                          * Allow loading rules that are in groups to cause
4653                          * them to be created if they don't already exit.
4654                          */
4655                         group = FR_NAME(fp, fr_group);
4656                         if (addrem == 0) {
4657                                 fg = ipf_group_add(softc, group, NULL,
4658                                                    fp->fr_flags, unit, set);
4659                                 fp->fr_grp = fg;
4660                         } else {
4661                                 fg = ipf_findgroup(softc, group, unit,
4662                                                    set, NULL);
4663                                 if (fg == NULL) {
4664                                         IPFERROR(12);
4665                                         error = ESRCH;
4666                                         goto donenolock;
4667                                 }
4668                         }
4669
4670                         if (fg->fg_flags == 0) {
4671                                 fg->fg_flags = fp->fr_flags & FR_INOUT;
4672                         } else if (fg->fg_flags != (fp->fr_flags & FR_INOUT)) {
4673                                 IPFERROR(13);
4674                                 error = ESRCH;
4675                                 goto donenolock;
4676                         }
4677                 }
4678         } else {
4679                 /*
4680                  * If a rule is going to be part of a group then it does
4681                  * not matter whether it is an in or out rule, but if it
4682                  * isn't in a group, then it does...
4683                  */
4684                 if ((fp->fr_flags & (FR_INQUE|FR_OUTQUE)) == 0) {
4685                         IPFERROR(14);
4686                         error = EINVAL;
4687                         goto donenolock;
4688                 }
4689         }
4690         in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
4691
4692         /*
4693          * Work out which rule list this change is being applied to.
4694          */
4695         ftail = NULL;
4696         fprev = NULL;
4697         if (unit == IPL_LOGAUTH) {
4698                 if ((fp->fr_tifs[0].fd_ptr != NULL) ||
4699                     (fp->fr_tifs[1].fd_ptr != NULL) ||
4700                     (fp->fr_dif.fd_ptr != NULL) ||
4701                     (fp->fr_flags & FR_FASTROUTE)) {
4702                         softc->ipf_interror = 145;
4703                         error = EINVAL;
4704                         goto donenolock;
4705                 }
4706                 fprev = ipf_auth_rulehead(softc);
4707         } else {
4708                 if (FR_ISACCOUNT(fp->fr_flags))
4709                         fprev = &softc->ipf_acct[in][set];
4710                 else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) != 0)
4711                         fprev = &softc->ipf_rules[in][set];
4712         }
4713         if (fprev == NULL) {
4714                 IPFERROR(15);
4715                 error = ESRCH;
4716                 goto donenolock;
4717         }
4718
4719         if (fg != NULL)
4720                 fprev = &fg->fg_start;
4721
4722         /*
4723          * Copy in extra data for the rule.
4724          */
4725         if (fp->fr_dsize != 0) {
4726                 if (makecopy != 0) {
4727                         KMALLOCS(ptr, void *, fp->fr_dsize);
4728                         if (ptr == NULL) {
4729                                 IPFERROR(16);
4730                                 error = ENOMEM;
4731                                 goto donenolock;
4732                         }
4733
4734                         /*
4735                          * The bcopy case is for when the data is appended
4736                          * to the rule by ipf_in_compat().
4737                          */
4738                         if (uptr >= (void *)fp &&
4739                             uptr < (void *)((char *)fp + fp->fr_size)) {
4740                                 bcopy(uptr, ptr, fp->fr_dsize);
4741                                 error = 0;
4742                         } else {
4743                                 error = COPYIN(uptr, ptr, fp->fr_dsize);
4744                                 if (error != 0) {
4745                                         IPFERROR(17);
4746                                         error = EFAULT;
4747                                         goto donenolock;
4748                                 }
4749                         }
4750                 } else {
4751                         ptr = uptr;
4752                 }
4753                 fp->fr_data = ptr;
4754         } else {
4755                 fp->fr_data = NULL;
4756         }
4757
4758         /*
4759          * Perform per-rule type sanity checks of their members.
4760          * All code after this needs to be aware that allocated memory
4761          * may need to be free'd before exiting.
4762          */
4763         switch (fp->fr_type & ~FR_T_BUILTIN)
4764         {
4765 #if defined(IPFILTER_BPF)
4766         case FR_T_BPFOPC :
4767                 if (fp->fr_dsize == 0) {
4768                         IPFERROR(19);
4769                         error = EINVAL;
4770                         break;
4771                 }
4772                 if (!bpf_validate(ptr, fp->fr_dsize/sizeof(struct bpf_insn))) {
4773                         IPFERROR(20);
4774                         error = EINVAL;
4775                         break;
4776                 }
4777                 break;
4778 #endif
4779         case FR_T_IPF :
4780                 /*
4781                  * Preparation for error case at the bottom of this function.
4782                  */
4783                 if (fp->fr_datype == FRI_LOOKUP)
4784                         fp->fr_dstptr = NULL;
4785                 if (fp->fr_satype == FRI_LOOKUP)
4786                         fp->fr_srcptr = NULL;
4787
4788                 if (fp->fr_dsize != sizeof(fripf_t)) {
4789                         IPFERROR(21);
4790                         error = EINVAL;
4791                         break;
4792                 }
4793
4794                 /*
4795                  * Allowing a rule with both "keep state" and "with oow" is
4796                  * pointless because adding a state entry to the table will
4797                  * fail with the out of window (oow) flag set.
4798                  */
4799                 if ((fp->fr_flags & FR_KEEPSTATE) && (fp->fr_flx & FI_OOW)) {
4800                         IPFERROR(22);
4801                         error = EINVAL;
4802                         break;
4803                 }
4804
4805                 switch (fp->fr_satype)
4806                 {
4807                 case FRI_BROADCAST :
4808                 case FRI_DYNAMIC :
4809                 case FRI_NETWORK :
4810                 case FRI_NETMASKED :
4811                 case FRI_PEERADDR :
4812                         if (fp->fr_sifpidx < 0) {
4813                                 IPFERROR(23);
4814                                 error = EINVAL;
4815                         }
4816                         break;
4817                 case FRI_LOOKUP :
4818                         fp->fr_srcptr = ipf_findlookup(softc, unit, fp,
4819                                                        &fp->fr_src6,
4820                                                        &fp->fr_smsk6);
4821                         if (fp->fr_srcfunc == NULL) {
4822                                 IPFERROR(132);
4823                                 error = ESRCH;
4824                                 break;
4825                         }
4826                         break;
4827                 case FRI_NORMAL :
4828                         break;
4829                 default :
4830                         IPFERROR(133);
4831                         error = EINVAL;
4832                         break;
4833                 }
4834                 if (error != 0)
4835                         break;
4836
4837                 switch (fp->fr_datype)
4838                 {
4839                 case FRI_BROADCAST :
4840                 case FRI_DYNAMIC :
4841                 case FRI_NETWORK :
4842                 case FRI_NETMASKED :
4843                 case FRI_PEERADDR :
4844                         if (fp->fr_difpidx < 0) {
4845                                 IPFERROR(24);
4846                                 error = EINVAL;
4847                         }
4848                         break;
4849                 case FRI_LOOKUP :
4850                         fp->fr_dstptr = ipf_findlookup(softc, unit, fp,
4851                                                        &fp->fr_dst6,
4852                                                        &fp->fr_dmsk6);
4853                         if (fp->fr_dstfunc == NULL) {
4854                                 IPFERROR(134);
4855                                 error = ESRCH;
4856                         }
4857                         break;
4858                 case FRI_NORMAL :
4859                         break;
4860                 default :
4861                         IPFERROR(135);
4862                         error = EINVAL;
4863                 }
4864                 break;
4865
4866         case FR_T_NONE :
4867         case FR_T_CALLFUNC :
4868         case FR_T_COMPIPF :
4869                 break;
4870
4871         case FR_T_IPFEXPR :
4872                 if (ipf_matcharray_verify(fp->fr_data, fp->fr_dsize) == -1) {
4873                         IPFERROR(25);
4874                         error = EINVAL;
4875                 }
4876                 break;
4877
4878         default :
4879                 IPFERROR(26);
4880                 error = EINVAL;
4881                 break;
4882         }
4883         if (error != 0)
4884                 goto donenolock;
4885
4886         if (fp->fr_tif.fd_name != -1) {
4887                 if ((fp->fr_tif.fd_name < 0) ||
4888                     (fp->fr_tif.fd_name >= fp->fr_namelen)) {
4889                         IPFERROR(139);
4890                         error = EINVAL;
4891                         goto donenolock;
4892                 }
4893         }
4894
4895         if (fp->fr_dif.fd_name != -1) {
4896                 if ((fp->fr_dif.fd_name < 0) ||
4897                     (fp->fr_dif.fd_name >= fp->fr_namelen)) {
4898                         IPFERROR(140);
4899                         error = EINVAL;
4900                         goto donenolock;
4901                 }
4902         }
4903
4904         if (fp->fr_rif.fd_name != -1) {
4905                 if ((fp->fr_rif.fd_name < 0) ||
4906                     (fp->fr_rif.fd_name >= fp->fr_namelen)) {
4907                         IPFERROR(141);
4908                         error = EINVAL;
4909                         goto donenolock;
4910                 }
4911         }
4912
4913         /*
4914          * Lookup all the interface names that are part of the rule.
4915          */
4916         error = ipf_synclist(softc, fp, NULL);
4917         if (error != 0)
4918                 goto donenolock;
4919         fp->fr_statecnt = 0;
4920         if (fp->fr_srctrack.ht_max_nodes != 0)
4921                 ipf_rb_ht_init(&fp->fr_srctrack);
4922
4923         /*
4924          * Look for an existing matching filter rule, but don't include the
4925          * next or interface pointer in the comparison (fr_next, fr_ifa).
4926          * This elminates rules which are indentical being loaded.  Checksum
4927          * the constant part of the filter rule to make comparisons quicker
4928          * (this meaning no pointers are included).
4929          */
4930         for (fp->fr_cksum = 0, p = (u_int *)&fp->fr_func, pp = &fp->fr_cksum;
4931              p < pp; p++)
4932                 fp->fr_cksum += *p;
4933         pp = (u_int *)(fp->fr_caddr + fp->fr_dsize);
4934         for (p = (u_int *)fp->fr_data; p < pp; p++)
4935                 fp->fr_cksum += *p;
4936
4937         WRITE_ENTER(&softc->ipf_mutex);
4938
4939         /*
4940          * Now that the filter rule lists are locked, we can walk the
4941          * chain of them without fear.
4942          */
4943         ftail = fprev;
4944         for (f = *ftail; (f = *ftail) != NULL; ftail = &f->fr_next) {
4945                 if (fp->fr_collect <= f->fr_collect) {
4946                         ftail = fprev;
4947                         f = NULL;
4948                         break;
4949                 }
4950                 fprev = ftail;
4951         }
4952
4953         for (; (f = *ftail) != NULL; ftail = &f->fr_next) {
4954                 if (ipf_rule_compare(fp, f) == 0)
4955                         break;
4956         }
4957
4958         /*
4959          * If zero'ing statistics, copy current to caller and zero.
4960          */
4961         if (addrem == 2) {
4962                 if (f == NULL) {
4963                         IPFERROR(27);
4964                         error = ESRCH;
4965                 } else {
4966                         /*
4967                          * Copy and reduce lock because of impending copyout.
4968                          * Well we should, but if we do then the atomicity of
4969                          * this call and the correctness of fr_hits and
4970                          * fr_bytes cannot be guaranteed.  As it is, this code
4971                          * only resets them to 0 if they are successfully
4972                          * copied out into user space.
4973                          */
4974                         bcopy((char *)f, (char *)fp, f->fr_size);
4975                         /* MUTEX_DOWNGRADE(&softc->ipf_mutex); */
4976
4977                         /*
4978                          * When we copy this rule back out, set the data
4979                          * pointer to be what it was in user space.
4980                          */
4981                         fp->fr_data = uptr;
4982                         error = ipf_outobj(softc, data, fp, IPFOBJ_FRENTRY);
4983
4984                         if (error == 0) {
4985                                 if ((f->fr_dsize != 0) && (uptr != NULL)) {
4986                                         error = COPYOUT(f->fr_data, uptr,
4987                                                         f->fr_dsize);
4988                                         if (error == 0) {
4989                                                 f->fr_hits = 0;
4990                                                 f->fr_bytes = 0;
4991                                         } else {
4992                                                 IPFERROR(28);
4993                                                 error = EFAULT;
4994                                         }
4995                                 }
4996                         }
4997                 }
4998
4999                 if (makecopy != 0) {
5000                         if (ptr != NULL) {
5001                                 KFREES(ptr, fp->fr_dsize);
5002                         }
5003                         KFREES(fp, fp->fr_size);
5004                 }
5005                 RWLOCK_EXIT(&softc->ipf_mutex);
5006                 return error;
5007         }
5008
5009         if (!f) {
5010                 /*
5011                  * At the end of this, ftail must point to the place where the
5012                  * new rule is to be saved/inserted/added.
5013                  * For SIOCAD*FR, this should be the last rule in the group of
5014                  * rules that have equal fr_collect fields.
5015                  * For SIOCIN*FR, ...
5016                  */
5017                 if (req == (ioctlcmd_t)SIOCADAFR ||
5018                     req == (ioctlcmd_t)SIOCADIFR) {
5019
5020                         for (ftail = fprev; (f = *ftail) != NULL; ) {
5021                                 if (f->fr_collect > fp->fr_collect)
5022                                         break;
5023                                 ftail = &f->fr_next;
5024                                 fprev = ftail;
5025                         }
5026                         ftail = fprev;
5027                         f = NULL;
5028                         ptr = NULL;
5029                 } else if (req == (ioctlcmd_t)SIOCINAFR ||
5030                            req == (ioctlcmd_t)SIOCINIFR) {
5031                         while ((f = *fprev) != NULL) {
5032                                 if (f->fr_collect >= fp->fr_collect)
5033                                         break;
5034                                 fprev = &f->fr_next;
5035                         }
5036                         ftail = fprev;
5037                         if (fp->fr_hits != 0) {
5038                                 while (fp->fr_hits && (f = *ftail)) {
5039                                         if (f->fr_collect != fp->fr_collect)
5040                                                 break;
5041                                         fprev = ftail;
5042                                         ftail = &f->fr_next;
5043                                         fp->fr_hits--;
5044                                 }
5045                         }
5046                         f = NULL;
5047                         ptr = NULL;
5048                 }
5049         }
5050
5051         /*
5052          * Request to remove a rule.
5053          */
5054         if (addrem == 1) {
5055                 if (!f) {
5056                         IPFERROR(29);
5057                         error = ESRCH;
5058                 } else {
5059                         /*
5060                          * Do not allow activity from user space to interfere
5061                          * with rules not loaded that way.
5062                          */
5063                         if ((makecopy == 1) && !(f->fr_flags & FR_COPIED)) {
5064                                 IPFERROR(30);
5065                                 error = EPERM;
5066                                 goto done;
5067                         }
5068
5069                         /*
5070                          * Return EBUSY if the rule is being reference by
5071                          * something else (eg state information.)
5072                          */
5073                         if (f->fr_ref > 1) {
5074                                 IPFERROR(31);
5075                                 error = EBUSY;
5076                                 goto done;
5077                         }
5078 #ifdef  IPFILTER_SCAN
5079                         if (f->fr_isctag != -1 &&
5080                             (f->fr_isc != (struct ipscan *)-1))
5081                                 ipf_scan_detachfr(f);
5082 #endif
5083
5084                         if (unit == IPL_LOGAUTH) {
5085                                 error = ipf_auth_precmd(softc, req, f, ftail);
5086                                 goto done;
5087                         }
5088
5089                         ipf_rule_delete(softc, f, unit, set);
5090
5091                         need_free = makecopy;
5092                 }
5093         } else {
5094                 /*
5095                  * Not removing, so we must be adding/inserting a rule.
5096                  */
5097                 if (f != NULL) {
5098                         IPFERROR(32);
5099                         error = EEXIST;
5100                         goto done;
5101                 }
5102                 if (unit == IPL_LOGAUTH) {
5103                         error = ipf_auth_precmd(softc, req, fp, ftail);
5104                         goto done;
5105                 }
5106
5107                 MUTEX_NUKE(&fp->fr_lock);
5108                 MUTEX_INIT(&fp->fr_lock, "filter rule lock");
5109                 if (fp->fr_die != 0)
5110                         ipf_rule_expire_insert(softc, fp, set);
5111
5112                 fp->fr_hits = 0;
5113                 if (makecopy != 0)
5114                         fp->fr_ref = 1;
5115                 fp->fr_pnext = ftail;
5116                 fp->fr_next = *ftail;
5117                 if (fp->fr_next != NULL)
5118                         fp->fr_next->fr_pnext = &fp->fr_next;
5119                 *ftail = fp;
5120                 if (addrem == 0)
5121                         ipf_fixskip(ftail, fp, 1);
5122
5123                 fp->fr_icmpgrp = NULL;
5124                 if (fp->fr_icmphead != -1) {
5125                         group = FR_NAME(fp, fr_icmphead);
5126                         fg = ipf_group_add(softc, group, fp, 0, unit, set);
5127                         fp->fr_icmpgrp = fg;
5128                 }
5129
5130                 fp->fr_grphead = NULL;
5131                 if (fp->fr_grhead != -1) {
5132                         group = FR_NAME(fp, fr_grhead);
5133                         fg = ipf_group_add(softc, group, fp, fp->fr_flags,
5134                                            unit, set);
5135                         fp->fr_grphead = fg;
5136                 }
5137         }
5138 done:
5139         RWLOCK_EXIT(&softc->ipf_mutex);
5140 donenolock:
5141         if (need_free || (error != 0)) {
5142                 if ((fp->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) {
5143                         if ((fp->fr_satype == FRI_LOOKUP) &&
5144                             (fp->fr_srcptr != NULL))
5145                                 ipf_lookup_deref(softc, fp->fr_srctype,
5146                                                  fp->fr_srcptr);
5147                         if ((fp->fr_datype == FRI_LOOKUP) &&
5148                             (fp->fr_dstptr != NULL))
5149                                 ipf_lookup_deref(softc, fp->fr_dsttype,
5150                                                  fp->fr_dstptr);
5151                 }
5152                 if (fp->fr_grp != NULL) {
5153                         WRITE_ENTER(&softc->ipf_mutex);
5154                         ipf_group_del(softc, fp->fr_grp, fp);
5155                         RWLOCK_EXIT(&softc->ipf_mutex);
5156                 }
5157                 if ((ptr != NULL) && (makecopy != 0)) {
5158                         KFREES(ptr, fp->fr_dsize);
5159                 }
5160                 KFREES(fp, fp->fr_size);
5161         }
5162         return (error);
5163 }
5164
5165
5166 /* ------------------------------------------------------------------------ */
5167 /* Function:   ipf_rule_delete                                              */
5168 /* Returns:    Nil                                                          */
5169 /* Parameters: softc(I) - pointer to soft context main structure            */
5170 /*             f(I)     - pointer to the rule being deleted                 */
5171 /*             ftail(I) - pointer to the pointer to f                       */
5172 /*             unit(I)  - device for which this is for                      */
5173 /*             set(I)   - 1 or 0 (filter set)                               */
5174 /*                                                                          */
5175 /* This function attempts to do what it can to delete a filter rule: remove */
5176 /* it from any linked lists and remove any groups it is responsible for.    */
5177 /* But in the end, removing a rule can only drop the reference count - we   */
5178 /* must use that as the guide for whether or not it can be freed.           */
5179 /* ------------------------------------------------------------------------ */
5180 static void
5181 ipf_rule_delete(softc, f, unit, set)
5182         ipf_main_softc_t *softc;
5183         frentry_t *f;
5184         int unit, set;
5185 {
5186
5187         /*
5188          * If fr_pdnext is set, then the rule is on the expire list, so
5189          * remove it from there.
5190          */
5191         if (f->fr_pdnext != NULL) {
5192                 *f->fr_pdnext = f->fr_dnext;
5193                 if (f->fr_dnext != NULL)
5194                         f->fr_dnext->fr_pdnext = f->fr_pdnext;
5195                 f->fr_pdnext = NULL;
5196                 f->fr_dnext = NULL;
5197         }
5198
5199         ipf_fixskip(f->fr_pnext, f, -1);
5200         if (f->fr_pnext != NULL)
5201                 *f->fr_pnext = f->fr_next;
5202         if (f->fr_next != NULL)
5203                 f->fr_next->fr_pnext = f->fr_pnext;
5204         f->fr_pnext = NULL;
5205         f->fr_next = NULL;
5206
5207         (void) ipf_derefrule(softc, &f);
5208 }
5209
5210 /* ------------------------------------------------------------------------ */
5211 /* Function:   ipf_rule_expire_insert                                       */
5212 /* Returns:    Nil                                                          */
5213 /* Parameters: softc(I) - pointer to soft context main structure            */
5214 /*             f(I)     - pointer to rule to be added to expire list        */
5215 /*             set(I)   - 1 or 0 (filter set)                               */
5216 /*                                                                          */
5217 /* If the new rule has a given expiration time, insert it into the list of  */
5218 /* expiring rules with the ones to be removed first added to the front of   */
5219 /* the list. The insertion is O(n) but it is kept sorted for quick scans at */
5220 /* expiration interval checks.                                              */
5221 /* ------------------------------------------------------------------------ */
5222 static void
5223 ipf_rule_expire_insert(softc, f, set)
5224         ipf_main_softc_t *softc;
5225         frentry_t *f;
5226         int set;
5227 {
5228         frentry_t *fr;
5229
5230         /*
5231          */
5232
5233         f->fr_die = softc->ipf_ticks + IPF_TTLVAL(f->fr_die);
5234         for (fr = softc->ipf_rule_explist[set]; fr != NULL;
5235              fr = fr->fr_dnext) {
5236                 if (f->fr_die < fr->fr_die)
5237                         break;
5238                 if (fr->fr_dnext == NULL) {
5239                         /*
5240                          * We've got to the last rule and everything
5241                          * wanted to be expired before this new node,
5242                          * so we have to tack it on the end...
5243                          */
5244                         fr->fr_dnext = f;
5245                         f->fr_pdnext = &fr->fr_dnext;
5246                         fr = NULL;
5247                         break;
5248                 }
5249         }
5250
5251         if (softc->ipf_rule_explist[set] == NULL) {
5252                 softc->ipf_rule_explist[set] = f;
5253                 f->fr_pdnext = &softc->ipf_rule_explist[set];
5254         } else if (fr != NULL) {
5255                 f->fr_dnext = fr;
5256                 f->fr_pdnext = fr->fr_pdnext;
5257                 fr->fr_pdnext = &f->fr_dnext;
5258         }
5259 }
5260
5261
5262 /* ------------------------------------------------------------------------ */
5263 /* Function:   ipf_findlookup                                               */
5264 /* Returns:    NULL = failure, else success                                 */
5265 /* Parameters: softc(I) - pointer to soft context main structure            */
5266 /*             unit(I)  - ipf device we want to find match for              */
5267 /*             fp(I)    - rule for which lookup is for                      */
5268 /*             addrp(I) - pointer to lookup information in address struct   */
5269 /*             maskp(O) - pointer to lookup information for storage         */
5270 /*                                                                          */
5271 /* When using pools and hash tables to store addresses for matching in      */
5272 /* rules, it is necessary to resolve both the object referred to by the     */
5273 /* name or address (and return that pointer) and also provide the means by  */
5274 /* which to determine if an address belongs to that object to make the      */
5275 /* packet matching quicker.                                                 */
5276 /* ------------------------------------------------------------------------ */
5277 static void *
5278 ipf_findlookup(softc, unit, fr, addrp, maskp)
5279         ipf_main_softc_t *softc;
5280         int unit;
5281         frentry_t *fr;
5282         i6addr_t *addrp, *maskp;
5283 {
5284         void *ptr = NULL;
5285
5286         switch (addrp->iplookupsubtype)
5287         {
5288         case 0 :
5289                 ptr = ipf_lookup_res_num(softc, unit, addrp->iplookuptype,
5290                                          addrp->iplookupnum,
5291                                          &maskp->iplookupfunc);
5292                 break;
5293         case 1 :
5294                 if (addrp->iplookupname < 0)
5295                         break;
5296                 if (addrp->iplookupname >= fr->fr_namelen)
5297                         break;
5298                 ptr = ipf_lookup_res_name(softc, unit, addrp->iplookuptype,
5299                                           fr->fr_names + addrp->iplookupname,
5300                                           &maskp->iplookupfunc);
5301                 break;
5302         default :
5303                 break;
5304         }
5305
5306         return ptr;
5307 }
5308
5309
5310 /* ------------------------------------------------------------------------ */
5311 /* Function:    ipf_funcinit                                                */
5312 /* Returns:     int - 0 == success, else ESRCH: cannot resolve rule details */
5313 /* Parameters:  softc(I) - pointer to soft context main structure           */
5314 /*              fr(I)    - pointer to filter rule                           */
5315 /*                                                                          */
5316 /* If a rule is a call rule, then check if the function it points to needs  */
5317 /* an init function to be called now the rule has been loaded.              */
5318 /* ------------------------------------------------------------------------ */
5319 static int
5320 ipf_funcinit(softc, fr)
5321         ipf_main_softc_t *softc;
5322         frentry_t *fr;
5323 {
5324         ipfunc_resolve_t *ft;
5325         int err;
5326
5327         IPFERROR(34);
5328         err = ESRCH;
5329
5330         for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5331                 if (ft->ipfu_addr == fr->fr_func) {
5332                         err = 0;
5333                         if (ft->ipfu_init != NULL)
5334                                 err = (*ft->ipfu_init)(softc, fr);
5335                         break;
5336                 }
5337         return err;
5338 }
5339
5340
5341 /* ------------------------------------------------------------------------ */
5342 /* Function:    ipf_funcfini                                                */
5343 /* Returns:     Nil                                                         */
5344 /* Parameters:  softc(I) - pointer to soft context main structure           */
5345 /*              fr(I)    - pointer to filter rule                           */
5346 /*                                                                          */
5347 /* For a given filter rule, call the matching "fini" function if the rule   */
5348 /* is using a known function that would have resulted in the "init" being   */
5349 /* called for ealier.                                                       */
5350 /* ------------------------------------------------------------------------ */
5351 static void
5352 ipf_funcfini(softc, fr)
5353         ipf_main_softc_t *softc;
5354         frentry_t *fr;
5355 {
5356         ipfunc_resolve_t *ft;
5357
5358         for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5359                 if (ft->ipfu_addr == fr->fr_func) {
5360                         if (ft->ipfu_fini != NULL)
5361                                 (void) (*ft->ipfu_fini)(softc, fr);
5362                         break;
5363                 }
5364 }
5365
5366
5367 /* ------------------------------------------------------------------------ */
5368 /* Function:    ipf_findfunc                                                */
5369 /* Returns:     ipfunc_t - pointer to function if found, else NULL          */
5370 /* Parameters:  funcptr(I) - function pointer to lookup                     */
5371 /*                                                                          */
5372 /* Look for a function in the table of known functions.                     */
5373 /* ------------------------------------------------------------------------ */
5374 static ipfunc_t
5375 ipf_findfunc(funcptr)
5376         ipfunc_t funcptr;
5377 {
5378         ipfunc_resolve_t *ft;
5379
5380         for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5381                 if (ft->ipfu_addr == funcptr)
5382                         return funcptr;
5383         return NULL;
5384 }
5385
5386
5387 /* ------------------------------------------------------------------------ */
5388 /* Function:    ipf_resolvefunc                                             */
5389 /* Returns:     int - 0 == success, else error                              */
5390 /* Parameters:  data(IO) - ioctl data pointer to ipfunc_resolve_t struct    */
5391 /*                                                                          */
5392 /* Copy in a ipfunc_resolve_t structure and then fill in the missing field. */
5393 /* This will either be the function name (if the pointer is set) or the     */
5394 /* function pointer if the name is set.  When found, fill in the other one  */
5395 /* so that the entire, complete, structure can be copied back to user space.*/
5396 /* ------------------------------------------------------------------------ */
5397 int
5398 ipf_resolvefunc(softc, data)
5399         ipf_main_softc_t *softc;
5400         void *data;
5401 {
5402         ipfunc_resolve_t res, *ft;
5403         int error;
5404
5405         error = BCOPYIN(data, &res, sizeof(res));
5406         if (error != 0) {
5407                 IPFERROR(123);
5408                 return EFAULT;
5409         }
5410
5411         if (res.ipfu_addr == NULL && res.ipfu_name[0] != '\0') {
5412                 for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5413                         if (strncmp(res.ipfu_name, ft->ipfu_name,
5414                                     sizeof(res.ipfu_name)) == 0) {
5415                                 res.ipfu_addr = ft->ipfu_addr;
5416                                 res.ipfu_init = ft->ipfu_init;
5417                                 if (COPYOUT(&res, data, sizeof(res)) != 0) {
5418                                         IPFERROR(35);
5419                                         return EFAULT;
5420                                 }
5421                                 return 0;
5422                         }
5423         }
5424         if (res.ipfu_addr != NULL && res.ipfu_name[0] == '\0') {
5425                 for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5426                         if (ft->ipfu_addr == res.ipfu_addr) {
5427                                 (void) strncpy(res.ipfu_name, ft->ipfu_name,
5428                                                sizeof(res.ipfu_name));
5429                                 res.ipfu_init = ft->ipfu_init;
5430                                 if (COPYOUT(&res, data, sizeof(res)) != 0) {
5431                                         IPFERROR(36);
5432                                         return EFAULT;
5433                                 }
5434                                 return 0;
5435                         }
5436         }
5437         IPFERROR(37);
5438         return ESRCH;
5439 }
5440
5441
5442 #if !defined(_KERNEL) || SOLARIS
5443 /*
5444  * From: NetBSD
5445  * ppsratecheck(): packets (or events) per second limitation.
5446  */
5447 int
5448 ppsratecheck(lasttime, curpps, maxpps)
5449         struct timeval *lasttime;
5450         int *curpps;
5451         int maxpps;     /* maximum pps allowed */
5452 {
5453         struct timeval tv, delta;
5454         int rv;
5455
5456         GETKTIME(&tv);
5457
5458         delta.tv_sec = tv.tv_sec - lasttime->tv_sec;
5459         delta.tv_usec = tv.tv_usec - lasttime->tv_usec;
5460         if (delta.tv_usec < 0) {
5461                 delta.tv_sec--;
5462                 delta.tv_usec += 1000000;
5463         }
5464
5465         /*
5466          * check for 0,0 is so that the message will be seen at least once.
5467          * if more than one second have passed since the last update of
5468          * lasttime, reset the counter.
5469          *
5470          * we do increment *curpps even in *curpps < maxpps case, as some may
5471          * try to use *curpps for stat purposes as well.
5472          */
5473         if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
5474             delta.tv_sec >= 1) {
5475                 *lasttime = tv;
5476                 *curpps = 0;
5477                 rv = 1;
5478         } else if (maxpps < 0)
5479                 rv = 1;
5480         else if (*curpps < maxpps)
5481                 rv = 1;
5482         else
5483                 rv = 0;
5484         *curpps = *curpps + 1;
5485
5486         return (rv);
5487 }
5488 #endif
5489
5490
5491 /* ------------------------------------------------------------------------ */
5492 /* Function:    ipf_derefrule                                               */
5493 /* Returns:     int   - 0 == rule freed up, else rule not freed             */
5494 /* Parameters:  fr(I) - pointer to filter rule                              */
5495 /*                                                                          */
5496 /* Decrement the reference counter to a rule by one.  If it reaches zero,   */
5497 /* free it and any associated storage space being used by it.               */
5498 /* ------------------------------------------------------------------------ */
5499 int
5500 ipf_derefrule(softc, frp)
5501         ipf_main_softc_t *softc;
5502         frentry_t **frp;
5503 {
5504         frentry_t *fr;
5505         frdest_t *fdp;
5506
5507         fr = *frp;
5508         *frp = NULL;
5509
5510         MUTEX_ENTER(&fr->fr_lock);
5511         fr->fr_ref--;
5512         if (fr->fr_ref == 0) {
5513                 MUTEX_EXIT(&fr->fr_lock);
5514                 MUTEX_DESTROY(&fr->fr_lock);
5515
5516                 ipf_funcfini(softc, fr);
5517
5518                 fdp = &fr->fr_tif;
5519                 if (fdp->fd_type == FRD_DSTLIST)
5520                         ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5521
5522                 fdp = &fr->fr_rif;
5523                 if (fdp->fd_type == FRD_DSTLIST)
5524                         ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5525
5526                 fdp = &fr->fr_dif;
5527                 if (fdp->fd_type == FRD_DSTLIST)
5528                         ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5529
5530                 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF &&
5531                     fr->fr_satype == FRI_LOOKUP)
5532                         ipf_lookup_deref(softc, fr->fr_srctype, fr->fr_srcptr);
5533                 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF &&
5534                     fr->fr_datype == FRI_LOOKUP)
5535                         ipf_lookup_deref(softc, fr->fr_dsttype, fr->fr_dstptr);
5536
5537                 if (fr->fr_grp != NULL)
5538                         ipf_group_del(softc, fr->fr_grp, fr);
5539
5540                 if (fr->fr_grphead != NULL)
5541                         ipf_group_del(softc, fr->fr_grphead, fr);
5542
5543                 if (fr->fr_icmpgrp != NULL)
5544                         ipf_group_del(softc, fr->fr_icmpgrp, fr);
5545
5546                 if ((fr->fr_flags & FR_COPIED) != 0) {
5547                         if (fr->fr_dsize) {
5548                                 KFREES(fr->fr_data, fr->fr_dsize);
5549                         }
5550                         KFREES(fr, fr->fr_size);
5551                         return 0;
5552                 }
5553                 return 1;
5554         } else {
5555                 MUTEX_EXIT(&fr->fr_lock);
5556         }
5557         return -1;
5558 }
5559
5560
5561 /* ------------------------------------------------------------------------ */
5562 /* Function:    ipf_grpmapinit                                              */
5563 /* Returns:     int - 0 == success, else ESRCH because table entry not found*/
5564 /* Parameters:  fr(I) - pointer to rule to find hash table for              */
5565 /*                                                                          */
5566 /* Looks for group hash table fr_arg and stores a pointer to it in fr_ptr.  */
5567 /* fr_ptr is later used by ipf_srcgrpmap and ipf_dstgrpmap.                 */
5568 /* ------------------------------------------------------------------------ */
5569 static int
5570 ipf_grpmapinit(softc, fr)
5571         ipf_main_softc_t *softc;
5572         frentry_t *fr;
5573 {
5574         char name[FR_GROUPLEN];
5575         iphtable_t *iph;
5576
5577 #if defined(SNPRINTF) && defined(_KERNEL)
5578         SNPRINTF(name, sizeof(name), "%d", fr->fr_arg);
5579 #else
5580         (void) sprintf(name, "%d", fr->fr_arg);
5581 #endif
5582         iph = ipf_lookup_find_htable(softc, IPL_LOGIPF, name);
5583         if (iph == NULL) {
5584                 IPFERROR(38);
5585                 return ESRCH;
5586         }
5587         if ((iph->iph_flags & FR_INOUT) != (fr->fr_flags & FR_INOUT)) {
5588                 IPFERROR(39);
5589                 return ESRCH;
5590         }
5591         iph->iph_ref++;
5592         fr->fr_ptr = iph;
5593         return 0;
5594 }
5595
5596
5597 /* ------------------------------------------------------------------------ */
5598 /* Function:    ipf_grpmapfini                                              */
5599 /* Returns:     int - 0 == success, else ESRCH because table entry not found*/
5600 /* Parameters:  softc(I) - pointer to soft context main structure           */
5601 /*              fr(I)    - pointer to rule to release hash table for        */
5602 /*                                                                          */
5603 /* For rules that have had ipf_grpmapinit called, ipf_lookup_deref needs to */
5604 /* be called to undo what ipf_grpmapinit caused to be done.                 */
5605 /* ------------------------------------------------------------------------ */
5606 static int
5607 ipf_grpmapfini(softc, fr)
5608         ipf_main_softc_t *softc;
5609         frentry_t *fr;
5610 {
5611         iphtable_t *iph;
5612         iph = fr->fr_ptr;
5613         if (iph != NULL)
5614                 ipf_lookup_deref(softc, IPLT_HASH, iph);
5615         return 0;
5616 }
5617
5618
5619 /* ------------------------------------------------------------------------ */
5620 /* Function:    ipf_srcgrpmap                                               */
5621 /* Returns:     frentry_t * - pointer to "new last matching" rule or NULL   */
5622 /* Parameters:  fin(I)    - pointer to packet information                   */
5623 /*              passp(IO) - pointer to current/new filter decision (unused) */
5624 /*                                                                          */
5625 /* Look for a rule group head in a hash table, using the source address as  */
5626 /* the key, and descend into that group and continue matching rules against */
5627 /* the packet.                                                              */
5628 /* ------------------------------------------------------------------------ */
5629 frentry_t *
5630 ipf_srcgrpmap(fin, passp)
5631         fr_info_t *fin;
5632         u_32_t *passp;
5633 {
5634         frgroup_t *fg;
5635         void *rval;
5636
5637         rval = ipf_iphmfindgroup(fin->fin_main_soft, fin->fin_fr->fr_ptr,
5638                                  &fin->fin_src);
5639         if (rval == NULL)
5640                 return NULL;
5641
5642         fg = rval;
5643         fin->fin_fr = fg->fg_start;
5644         (void) ipf_scanlist(fin, *passp);
5645         return fin->fin_fr;
5646 }
5647
5648
5649 /* ------------------------------------------------------------------------ */
5650 /* Function:    ipf_dstgrpmap                                               */
5651 /* Returns:     frentry_t * - pointer to "new last matching" rule or NULL   */
5652 /* Parameters:  fin(I)    - pointer to packet information                   */
5653 /*              passp(IO) - pointer to current/new filter decision (unused) */
5654 /*                                                                          */
5655 /* Look for a rule group head in a hash table, using the destination        */
5656 /* address as the key, and descend into that group and continue matching    */
5657 /* rules against  the packet.                                               */
5658 /* ------------------------------------------------------------------------ */
5659 frentry_t *
5660 ipf_dstgrpmap(fin, passp)
5661         fr_info_t *fin;
5662         u_32_t *passp;
5663 {
5664         frgroup_t *fg;
5665         void *rval;
5666
5667         rval = ipf_iphmfindgroup(fin->fin_main_soft, fin->fin_fr->fr_ptr,
5668                                  &fin->fin_dst);
5669         if (rval == NULL)
5670                 return NULL;
5671
5672         fg = rval;
5673         fin->fin_fr = fg->fg_start;
5674         (void) ipf_scanlist(fin, *passp);
5675         return fin->fin_fr;
5676 }
5677
5678 /*
5679  * Queue functions
5680  * ===============
5681  * These functions manage objects on queues for efficient timeouts.  There
5682  * are a number of system defined queues as well as user defined timeouts.
5683  * It is expected that a lock is held in the domain in which the queue
5684  * belongs (i.e. either state or NAT) when calling any of these functions
5685  * that prevents ipf_freetimeoutqueue() from being called at the same time
5686  * as any other.
5687  */
5688
5689
5690 /* ------------------------------------------------------------------------ */
5691 /* Function:    ipf_addtimeoutqueue                                         */
5692 /* Returns:     struct ifqtq * - NULL if malloc fails, else pointer to      */
5693 /*                               timeout queue with given interval.         */
5694 /* Parameters:  parent(I)  - pointer to pointer to parent node of this list */
5695 /*                           of interface queues.                           */
5696 /*              seconds(I) - timeout value in seconds for this queue.       */
5697 /*                                                                          */
5698 /* This routine first looks for a timeout queue that matches the interval   */
5699 /* being requested.  If it finds one, increments the reference counter and  */
5700 /* returns a pointer to it.  If none are found, it allocates a new one and  */
5701 /* inserts it at the top of the list.                                       */
5702 /*                                                                          */
5703 /* Locking.                                                                 */
5704 /* It is assumed that the caller of this function has an appropriate lock   */
5705 /* held (exclusively) in the domain that encompases 'parent'.               */
5706 /* ------------------------------------------------------------------------ */
5707 ipftq_t *
5708 ipf_addtimeoutqueue(softc, parent, seconds)
5709         ipf_main_softc_t *softc;
5710         ipftq_t **parent;
5711         u_int seconds;
5712 {
5713         ipftq_t *ifq;
5714         u_int period;
5715
5716         period = seconds * IPF_HZ_DIVIDE;
5717
5718         MUTEX_ENTER(&softc->ipf_timeoutlock);
5719         for (ifq = *parent; ifq != NULL; ifq = ifq->ifq_next) {
5720                 if (ifq->ifq_ttl == period) {
5721                         /*
5722                          * Reset the delete flag, if set, so the structure
5723                          * gets reused rather than freed and reallocated.
5724                          */
5725                         MUTEX_ENTER(&ifq->ifq_lock);
5726                         ifq->ifq_flags &= ~IFQF_DELETE;
5727                         ifq->ifq_ref++;
5728                         MUTEX_EXIT(&ifq->ifq_lock);
5729                         MUTEX_EXIT(&softc->ipf_timeoutlock);
5730
5731                         return ifq;
5732                 }
5733         }
5734
5735         KMALLOC(ifq, ipftq_t *);
5736         if (ifq != NULL) {
5737                 MUTEX_NUKE(&ifq->ifq_lock);
5738                 IPFTQ_INIT(ifq, period, "ipftq mutex");
5739                 ifq->ifq_next = *parent;
5740                 ifq->ifq_pnext = parent;
5741                 ifq->ifq_flags = IFQF_USER;
5742                 ifq->ifq_ref++;
5743                 *parent = ifq;
5744                 softc->ipf_userifqs++;
5745         }
5746         MUTEX_EXIT(&softc->ipf_timeoutlock);
5747         return ifq;
5748 }
5749
5750
5751 /* ------------------------------------------------------------------------ */
5752 /* Function:    ipf_deletetimeoutqueue                                      */
5753 /* Returns:     int    - new reference count value of the timeout queue     */
5754 /* Parameters:  ifq(I) - timeout queue which is losing a reference.         */
5755 /* Locks:       ifq->ifq_lock                                               */
5756 /*                                                                          */
5757 /* This routine must be called when we're discarding a pointer to a timeout */
5758 /* queue object, taking care of the reference counter.                      */
5759 /*                                                                          */
5760 /* Now that this just sets a DELETE flag, it requires the expire code to    */
5761 /* check the list of user defined timeout queues and call the free function */
5762 /* below (currently commented out) to stop memory leaking.  It is done this */
5763 /* way because the locking may not be sufficient to safely do a free when   */
5764 /* this function is called.                                                 */
5765 /* ------------------------------------------------------------------------ */
5766 int
5767 ipf_deletetimeoutqueue(ifq)
5768         ipftq_t *ifq;
5769 {
5770
5771         ifq->ifq_ref--;
5772         if ((ifq->ifq_ref == 0) && ((ifq->ifq_flags & IFQF_USER) != 0)) {
5773                 ifq->ifq_flags |= IFQF_DELETE;
5774         }
5775
5776         return ifq->ifq_ref;
5777 }
5778
5779
5780 /* ------------------------------------------------------------------------ */
5781 /* Function:    ipf_freetimeoutqueue                                        */
5782 /* Parameters:  ifq(I) - timeout queue which is losing a reference.         */
5783 /* Returns:     Nil                                                         */
5784 /*                                                                          */
5785 /* Locking:                                                                 */
5786 /* It is assumed that the caller of this function has an appropriate lock   */
5787 /* held (exclusively) in the domain that encompases the callers "domain".   */
5788 /* The ifq_lock for this structure should not be held.                      */
5789 /*                                                                          */
5790 /* Remove a user defined timeout queue from the list of queues it is in and */
5791 /* tidy up after this is done.                                              */
5792 /* ------------------------------------------------------------------------ */
5793 void
5794 ipf_freetimeoutqueue(softc, ifq)
5795         ipf_main_softc_t *softc;
5796         ipftq_t *ifq;
5797 {
5798
5799         if (((ifq->ifq_flags & IFQF_DELETE) == 0) || (ifq->ifq_ref != 0) ||
5800             ((ifq->ifq_flags & IFQF_USER) == 0)) {
5801                 printf("ipf_freetimeoutqueue(%lx) flags 0x%x ttl %d ref %d\n",
5802                        (u_long)ifq, ifq->ifq_flags, ifq->ifq_ttl,
5803                        ifq->ifq_ref);
5804                 return;
5805         }
5806
5807         /*
5808          * Remove from its position in the list.
5809          */
5810         *ifq->ifq_pnext = ifq->ifq_next;
5811         if (ifq->ifq_next != NULL)
5812                 ifq->ifq_next->ifq_pnext = ifq->ifq_pnext;
5813         ifq->ifq_next = NULL;
5814         ifq->ifq_pnext = NULL;
5815
5816         MUTEX_DESTROY(&ifq->ifq_lock);
5817         ATOMIC_DEC(softc->ipf_userifqs);
5818         KFREE(ifq);
5819 }
5820
5821
5822 /* ------------------------------------------------------------------------ */
5823 /* Function:    ipf_deletequeueentry                                        */
5824 /* Returns:     Nil                                                         */
5825 /* Parameters:  tqe(I) - timeout queue entry to delete                      */
5826 /*                                                                          */
5827 /* Remove a tail queue entry from its queue and make it an orphan.          */
5828 /* ipf_deletetimeoutqueue is called to make sure the reference count on the */
5829 /* queue is correct.  We can't, however, call ipf_freetimeoutqueue because  */
5830 /* the correct lock(s) may not be held that would make it safe to do so.    */
5831 /* ------------------------------------------------------------------------ */
5832 void
5833 ipf_deletequeueentry(tqe)
5834         ipftqent_t *tqe;
5835 {
5836         ipftq_t *ifq;
5837
5838         ifq = tqe->tqe_ifq;
5839
5840         MUTEX_ENTER(&ifq->ifq_lock);
5841
5842         if (tqe->tqe_pnext != NULL) {
5843                 *tqe->tqe_pnext = tqe->tqe_next;
5844                 if (tqe->tqe_next != NULL)
5845                         tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5846                 else    /* we must be the tail anyway */
5847                         ifq->ifq_tail = tqe->tqe_pnext;
5848
5849                 tqe->tqe_pnext = NULL;
5850                 tqe->tqe_ifq = NULL;
5851         }
5852
5853         (void) ipf_deletetimeoutqueue(ifq);
5854         ASSERT(ifq->ifq_ref > 0);
5855
5856         MUTEX_EXIT(&ifq->ifq_lock);
5857 }
5858
5859
5860 /* ------------------------------------------------------------------------ */
5861 /* Function:    ipf_queuefront                                              */
5862 /* Returns:     Nil                                                         */
5863 /* Parameters:  tqe(I) - pointer to timeout queue entry                     */
5864 /*                                                                          */
5865 /* Move a queue entry to the front of the queue, if it isn't already there. */
5866 /* ------------------------------------------------------------------------ */
5867 void
5868 ipf_queuefront(tqe)
5869         ipftqent_t *tqe;
5870 {
5871         ipftq_t *ifq;
5872
5873         ifq = tqe->tqe_ifq;
5874         if (ifq == NULL)
5875                 return;
5876
5877         MUTEX_ENTER(&ifq->ifq_lock);
5878         if (ifq->ifq_head != tqe) {
5879                 *tqe->tqe_pnext = tqe->tqe_next;
5880                 if (tqe->tqe_next)
5881                         tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5882                 else
5883                         ifq->ifq_tail = tqe->tqe_pnext;
5884
5885                 tqe->tqe_next = ifq->ifq_head;
5886                 ifq->ifq_head->tqe_pnext = &tqe->tqe_next;
5887                 ifq->ifq_head = tqe;
5888                 tqe->tqe_pnext = &ifq->ifq_head;
5889         }
5890         MUTEX_EXIT(&ifq->ifq_lock);
5891 }
5892
5893
5894 /* ------------------------------------------------------------------------ */
5895 /* Function:    ipf_queueback                                               */
5896 /* Returns:     Nil                                                         */
5897 /* Parameters:  ticks(I) - ipf tick time to use with this call              */
5898 /*              tqe(I)   - pointer to timeout queue entry                   */
5899 /*                                                                          */
5900 /* Move a queue entry to the back of the queue, if it isn't already there.  */
5901 /* We use use ticks to calculate the expiration and mark for when we last   */
5902 /* touched the structure.                                                   */
5903 /* ------------------------------------------------------------------------ */
5904 void
5905 ipf_queueback(ticks, tqe)
5906         u_long ticks;
5907         ipftqent_t *tqe;
5908 {
5909         ipftq_t *ifq;
5910
5911         ifq = tqe->tqe_ifq;
5912         if (ifq == NULL)
5913                 return;
5914         tqe->tqe_die = ticks + ifq->ifq_ttl;
5915         tqe->tqe_touched = ticks;
5916
5917         MUTEX_ENTER(&ifq->ifq_lock);
5918         if (tqe->tqe_next != NULL) {            /* at the end already ? */
5919                 /*
5920                  * Remove from list
5921                  */
5922                 *tqe->tqe_pnext = tqe->tqe_next;
5923                 tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5924
5925                 /*
5926                  * Make it the last entry.
5927                  */
5928                 tqe->tqe_next = NULL;
5929                 tqe->tqe_pnext = ifq->ifq_tail;
5930                 *ifq->ifq_tail = tqe;
5931                 ifq->ifq_tail = &tqe->tqe_next;
5932         }
5933         MUTEX_EXIT(&ifq->ifq_lock);
5934 }
5935
5936
5937 /* ------------------------------------------------------------------------ */
5938 /* Function:    ipf_queueappend                                             */
5939 /* Returns:     Nil                                                         */
5940 /* Parameters:  ticks(I)  - ipf tick time to use with this call             */
5941 /*              tqe(I)    - pointer to timeout queue entry                  */
5942 /*              ifq(I)    - pointer to timeout queue                        */
5943 /*              parent(I) - owing object pointer                            */
5944 /*                                                                          */
5945 /* Add a new item to this queue and put it on the very end.                 */
5946 /* We use use ticks to calculate the expiration and mark for when we last   */
5947 /* touched the structure.                                                   */
5948 /* ------------------------------------------------------------------------ */
5949 void
5950 ipf_queueappend(ticks, tqe, ifq, parent)
5951         u_long ticks;
5952         ipftqent_t *tqe;
5953         ipftq_t *ifq;
5954         void *parent;
5955 {
5956
5957         MUTEX_ENTER(&ifq->ifq_lock);
5958         tqe->tqe_parent = parent;
5959         tqe->tqe_pnext = ifq->ifq_tail;
5960         *ifq->ifq_tail = tqe;
5961         ifq->ifq_tail = &tqe->tqe_next;
5962         tqe->tqe_next = NULL;
5963         tqe->tqe_ifq = ifq;
5964         tqe->tqe_die = ticks + ifq->ifq_ttl;
5965         tqe->tqe_touched = ticks;
5966         ifq->ifq_ref++;
5967         MUTEX_EXIT(&ifq->ifq_lock);
5968 }
5969
5970
5971 /* ------------------------------------------------------------------------ */
5972 /* Function:    ipf_movequeue                                               */
5973 /* Returns:     Nil                                                         */
5974 /* Parameters:  tq(I)   - pointer to timeout queue information              */
5975 /*              oifp(I) - old timeout queue entry was on                    */
5976 /*              nifp(I) - new timeout queue to put entry on                 */
5977 /*                                                                          */
5978 /* Move a queue entry from one timeout queue to another timeout queue.      */
5979 /* If it notices that the current entry is already last and does not need   */
5980 /* to move queue, the return.                                               */
5981 /* ------------------------------------------------------------------------ */
5982 void
5983 ipf_movequeue(ticks, tqe, oifq, nifq)
5984         u_long ticks;
5985         ipftqent_t *tqe;
5986         ipftq_t *oifq, *nifq;
5987 {
5988
5989         /*
5990          * If the queue hasn't changed and we last touched this entry at the
5991          * same ipf time, then we're not going to achieve anything by either
5992          * changing the ttl or moving it on the queue.
5993          */
5994         if (oifq == nifq && tqe->tqe_touched == ticks)
5995                 return;
5996
5997         /*
5998          * For any of this to be outside the lock, there is a risk that two
5999          * packets entering simultaneously, with one changing to a different
6000          * queue and one not, could end up with things in a bizarre state.
6001          */
6002         MUTEX_ENTER(&oifq->ifq_lock);
6003
6004         tqe->tqe_touched = ticks;
6005         tqe->tqe_die = ticks + nifq->ifq_ttl;
6006         /*
6007          * Is the operation here going to be a no-op ?
6008          */
6009         if (oifq == nifq) {
6010                 if ((tqe->tqe_next == NULL) ||
6011                     (tqe->tqe_next->tqe_die == tqe->tqe_die)) {
6012                         MUTEX_EXIT(&oifq->ifq_lock);
6013                         return;
6014                 }
6015         }
6016
6017         /*
6018          * Remove from the old queue
6019          */
6020         *tqe->tqe_pnext = tqe->tqe_next;
6021         if (tqe->tqe_next)
6022                 tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
6023         else
6024                 oifq->ifq_tail = tqe->tqe_pnext;
6025         tqe->tqe_next = NULL;
6026
6027         /*
6028          * If we're moving from one queue to another, release the
6029          * lock on the old queue and get a lock on the new queue.
6030          * For user defined queues, if we're moving off it, call
6031          * delete in case it can now be freed.
6032          */
6033         if (oifq != nifq) {
6034                 tqe->tqe_ifq = NULL;
6035
6036                 (void) ipf_deletetimeoutqueue(oifq);
6037
6038                 MUTEX_EXIT(&oifq->ifq_lock);
6039
6040                 MUTEX_ENTER(&nifq->ifq_lock);
6041
6042                 tqe->tqe_ifq = nifq;
6043                 nifq->ifq_ref++;
6044         }
6045
6046         /*
6047          * Add to the bottom of the new queue
6048          */
6049         tqe->tqe_pnext = nifq->ifq_tail;
6050         *nifq->ifq_tail = tqe;
6051         nifq->ifq_tail = &tqe->tqe_next;
6052         MUTEX_EXIT(&nifq->ifq_lock);
6053 }
6054
6055
6056 /* ------------------------------------------------------------------------ */
6057 /* Function:    ipf_updateipid                                              */
6058 /* Returns:     int - 0 == success, -1 == error (packet should be droppped) */
6059 /* Parameters:  fin(I) - pointer to packet information                      */
6060 /*                                                                          */
6061 /* When we are doing NAT, change the IP of every packet to represent a      */
6062 /* single sequence of packets coming from the host, hiding any host         */
6063 /* specific sequencing that might otherwise be revealed.  If the packet is  */
6064 /* a fragment, then store the 'new' IPid in the fragment cache and look up  */
6065 /* the fragment cache for non-leading fragments.  If a non-leading fragment */
6066 /* has no match in the cache, return an error.                              */
6067 /* ------------------------------------------------------------------------ */
6068 static int
6069 ipf_updateipid(fin)
6070         fr_info_t *fin;
6071 {
6072         u_short id, ido, sums;
6073         u_32_t sumd, sum;
6074         ip_t *ip;
6075
6076         ip = fin->fin_ip;
6077         ido = ntohs(ip->ip_id);
6078         if (fin->fin_off != 0) {
6079                 sum = ipf_frag_ipidknown(fin);
6080                 if (sum == 0xffffffff)
6081                         return -1;
6082                 sum &= 0xffff;
6083                 id = (u_short)sum;
6084                 ip->ip_id = htons(id);
6085         } else {
6086                 ip_fillid(ip);
6087                 id = ntohs(ip->ip_id);
6088                 if ((fin->fin_flx & FI_FRAG) != 0)
6089                         (void) ipf_frag_ipidnew(fin, (u_32_t)id);
6090         }
6091
6092         if (id == ido)
6093                 return 0;
6094         CALC_SUMD(ido, id, sumd);       /* DESTRUCTIVE MACRO! id,ido change */
6095         sum = (~ntohs(ip->ip_sum)) & 0xffff;
6096         sum += sumd;
6097         sum = (sum >> 16) + (sum & 0xffff);
6098         sum = (sum >> 16) + (sum & 0xffff);
6099         sums = ~(u_short)sum;
6100         ip->ip_sum = htons(sums);
6101         return 0;
6102 }
6103
6104
6105 #ifdef  NEED_FRGETIFNAME
6106 /* ------------------------------------------------------------------------ */
6107 /* Function:    ipf_getifname                                               */
6108 /* Returns:     char *    - pointer to interface name                       */
6109 /* Parameters:  ifp(I)    - pointer to network interface                    */
6110 /*              buffer(O) - pointer to where to store interface name        */
6111 /*                                                                          */
6112 /* Constructs an interface name in the buffer passed.  The buffer passed is */
6113 /* expected to be at least LIFNAMSIZ in bytes big.  If buffer is passed in  */
6114 /* as a NULL pointer then return a pointer to a static array.               */
6115 /* ------------------------------------------------------------------------ */
6116 char *
6117 ipf_getifname(ifp, buffer)
6118         struct ifnet *ifp;
6119         char *buffer;
6120 {
6121         static char namebuf[LIFNAMSIZ];
6122 # if defined(MENTAT) || defined(__FreeBSD__)
6123         int unit, space;
6124         char temp[20];
6125         char *s;
6126 # endif
6127
6128         if (buffer == NULL)
6129                 buffer = namebuf;
6130         (void) strncpy(buffer, ifp->if_name, LIFNAMSIZ);
6131         buffer[LIFNAMSIZ - 1] = '\0';
6132 # if defined(MENTAT) || defined(__FreeBSD__)
6133         for (s = buffer; *s; s++)
6134                 ;
6135         unit = ifp->if_unit;
6136         space = LIFNAMSIZ - (s - buffer);
6137         if ((space > 0) && (unit >= 0)) {
6138 #  if defined(SNPRINTF) && defined(_KERNEL)
6139                 SNPRINTF(temp, sizeof(temp), "%d", unit);
6140 #  else
6141                 (void) sprintf(temp, "%d", unit);
6142 #  endif
6143                 (void) strncpy(s, temp, space);
6144         }
6145 # endif
6146         return buffer;
6147 }
6148 #endif
6149
6150
6151 /* ------------------------------------------------------------------------ */
6152 /* Function:    ipf_ioctlswitch                                             */
6153 /* Returns:     int     - -1 continue processing, else ioctl return value   */
6154 /* Parameters:  unit(I) - device unit opened                                */
6155 /*              data(I) - pointer to ioctl data                             */
6156 /*              cmd(I)  - ioctl command                                     */
6157 /*              mode(I) - mode value                                        */
6158 /*              uid(I)  - uid making the ioctl call                         */
6159 /*              ctx(I)  - pointer to context data                           */
6160 /*                                                                          */
6161 /* Based on the value of unit, call the appropriate ioctl handler or return */
6162 /* EIO if ipfilter is not running.   Also checks if write perms are req'd   */
6163 /* for the device in order to execute the ioctl.  A special case is made    */
6164 /* SIOCIPFINTERROR so that the same code isn't required in every handler.   */
6165 /* The context data pointer is passed through as this is used as the key    */
6166 /* for locating a matching token for continued access for walking lists,    */
6167 /* etc.                                                                     */
6168 /* ------------------------------------------------------------------------ */
6169 int
6170 ipf_ioctlswitch(softc, unit, data, cmd, mode, uid, ctx)
6171         ipf_main_softc_t *softc;
6172         int unit, mode, uid;
6173         ioctlcmd_t cmd;
6174         void *data, *ctx;
6175 {
6176         int error = 0;
6177
6178         switch (cmd)
6179         {
6180         case SIOCIPFINTERROR :
6181                 error = BCOPYOUT(&softc->ipf_interror, data,
6182                                  sizeof(softc->ipf_interror));
6183                 if (error != 0) {
6184                         IPFERROR(40);
6185                         error = EFAULT;
6186                 }
6187                 return error;
6188         default :
6189                 break;
6190         }
6191
6192         switch (unit)
6193         {
6194         case IPL_LOGIPF :
6195                 error = ipf_ipf_ioctl(softc, data, cmd, mode, uid, ctx);
6196                 break;
6197         case IPL_LOGNAT :
6198                 if (softc->ipf_running > 0) {
6199                         error = ipf_nat_ioctl(softc, data, cmd, mode,
6200                                               uid, ctx);
6201                 } else {
6202                         IPFERROR(42);
6203                         error = EIO;
6204                 }
6205                 break;
6206         case IPL_LOGSTATE :
6207                 if (softc->ipf_running > 0) {
6208                         error = ipf_state_ioctl(softc, data, cmd, mode,
6209                                                 uid, ctx);
6210                 } else {
6211                         IPFERROR(43);
6212                         error = EIO;
6213                 }
6214                 break;
6215         case IPL_LOGAUTH :
6216                 if (softc->ipf_running > 0) {
6217                         error = ipf_auth_ioctl(softc, data, cmd, mode,
6218                                                uid, ctx);
6219                 } else {
6220                         IPFERROR(44);
6221                         error = EIO;
6222                 }
6223                 break;
6224         case IPL_LOGSYNC :
6225                 if (softc->ipf_running > 0) {
6226                         error = ipf_sync_ioctl(softc, data, cmd, mode,
6227                                                uid, ctx);
6228                 } else {
6229                         error = EIO;
6230                         IPFERROR(45);
6231                 }
6232                 break;
6233         case IPL_LOGSCAN :
6234 #ifdef IPFILTER_SCAN
6235                 if (softc->ipf_running > 0)
6236                         error = ipf_scan_ioctl(softc, data, cmd, mode,
6237                                                uid, ctx);
6238                 else
6239 #endif
6240                 {
6241                         error = EIO;
6242                         IPFERROR(46);
6243                 }
6244                 break;
6245         case IPL_LOGLOOKUP :
6246                 if (softc->ipf_running > 0) {
6247                         error = ipf_lookup_ioctl(softc, data, cmd, mode,
6248                                                  uid, ctx);
6249                 } else {
6250                         error = EIO;
6251                         IPFERROR(47);
6252                 }
6253                 break;
6254         default :
6255                 IPFERROR(48);
6256                 error = EIO;
6257                 break;
6258         }
6259
6260         return error;
6261 }
6262
6263
6264 /*
6265  * This array defines the expected size of objects coming into the kernel
6266  * for the various recognised object types. The first column is flags (see
6267  * below), 2nd column is current size, 3rd column is the version number of
6268  * when the current size became current.
6269  * Flags:
6270  * 1 = minimum size, not absolute size
6271  */
6272 static  int     ipf_objbytes[IPFOBJ_COUNT][3] = {
6273         { 1,    sizeof(struct frentry),         5010000 },      /* 0 */
6274         { 1,    sizeof(struct friostat),        5010000 },
6275         { 0,    sizeof(struct fr_info),         5010000 },
6276         { 0,    sizeof(struct ipf_authstat),    4010100 },
6277         { 0,    sizeof(struct ipfrstat),        5010000 },
6278         { 1,    sizeof(struct ipnat),           5010000 },      /* 5 */
6279         { 0,    sizeof(struct natstat),         5010000 },
6280         { 0,    sizeof(struct ipstate_save),    5010000 },
6281         { 1,    sizeof(struct nat_save),        5010000 },
6282         { 0,    sizeof(struct natlookup),       5010000 },
6283         { 1,    sizeof(struct ipstate),         5010000 },      /* 10 */
6284         { 0,    sizeof(struct ips_stat),        5010000 },
6285         { 0,    sizeof(struct frauth),          5010000 },
6286         { 0,    sizeof(struct ipftune),         4010100 },
6287         { 0,    sizeof(struct nat),             5010000 },
6288         { 0,    sizeof(struct ipfruleiter),     4011400 },      /* 15 */
6289         { 0,    sizeof(struct ipfgeniter),      4011400 },
6290         { 0,    sizeof(struct ipftable),        4011400 },
6291         { 0,    sizeof(struct ipflookupiter),   4011400 },
6292         { 0,    sizeof(struct ipftq) * IPF_TCP_NSTATES },
6293         { 1,    0,                              0       }, /* IPFEXPR */
6294         { 0,    0,                              0       }, /* PROXYCTL */
6295         { 0,    sizeof (struct fripf),          5010000 }
6296 };
6297
6298
6299 /* ------------------------------------------------------------------------ */
6300 /* Function:    ipf_inobj                                                   */
6301 /* Returns:     int     - 0 = success, else failure                         */
6302 /* Parameters:  softc(I) - soft context pointerto work with                 */
6303 /*              data(I)  - pointer to ioctl data                            */
6304 /*              objp(O)  - where to store ipfobj structure                  */
6305 /*              ptr(I)   - pointer to data to copy out                      */
6306 /*              type(I)  - type of structure being moved                    */
6307 /*                                                                          */
6308 /* Copy in the contents of what the ipfobj_t points to.  In future, we      */
6309 /* add things to check for version numbers, sizes, etc, to make it backward */
6310 /* compatible at the ABI for user land.                                     */
6311 /* If objp is not NULL then we assume that the caller wants to see what is  */
6312 /* in the ipfobj_t structure being copied in. As an example, this can tell  */
6313 /* the caller what version of ipfilter the ioctl program was written to.    */
6314 /* ------------------------------------------------------------------------ */
6315 int
6316 ipf_inobj(softc, data, objp, ptr, type)
6317         ipf_main_softc_t *softc;
6318         void *data;
6319         ipfobj_t *objp;
6320         void *ptr;
6321         int type;
6322 {
6323         ipfobj_t obj;
6324         int error;
6325         int size;
6326
6327         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6328                 IPFERROR(49);
6329                 return EINVAL;
6330         }
6331
6332         if (objp == NULL)
6333                 objp = &obj;
6334         error = BCOPYIN(data, objp, sizeof(*objp));
6335         if (error != 0) {
6336                 IPFERROR(124);
6337                 return EFAULT;
6338         }
6339
6340         if (objp->ipfo_type != type) {
6341                 IPFERROR(50);
6342                 return EINVAL;
6343         }
6344
6345         if (objp->ipfo_rev >= ipf_objbytes[type][2]) {
6346                 if ((ipf_objbytes[type][0] & 1) != 0) {
6347                         if (objp->ipfo_size < ipf_objbytes[type][1]) {
6348                                 IPFERROR(51);
6349                                 return EINVAL;
6350                         }
6351                         size =  ipf_objbytes[type][1];
6352                 } else if (objp->ipfo_size == ipf_objbytes[type][1]) {
6353                         size =  objp->ipfo_size;
6354                 } else {
6355                         IPFERROR(52);
6356                         return EINVAL;
6357                 }
6358                 error = COPYIN(objp->ipfo_ptr, ptr, size);
6359                 if (error != 0) {
6360                         IPFERROR(55);
6361                         error = EFAULT;
6362                 }
6363         } else {
6364 #ifdef  IPFILTER_COMPAT
6365                 error = ipf_in_compat(softc, objp, ptr, 0);
6366 #else
6367                 IPFERROR(54);
6368                 error = EINVAL;
6369 #endif
6370         }
6371         return error;
6372 }
6373
6374
6375 /* ------------------------------------------------------------------------ */
6376 /* Function:    ipf_inobjsz                                                 */
6377 /* Returns:     int     - 0 = success, else failure                         */
6378 /* Parameters:  softc(I) - soft context pointerto work with                 */
6379 /*              data(I)  - pointer to ioctl data                            */
6380 /*              ptr(I)   - pointer to store real data in                    */
6381 /*              type(I)  - type of structure being moved                    */
6382 /*              sz(I)    - size of data to copy                             */
6383 /*                                                                          */
6384 /* As per ipf_inobj, except the size of the object to copy in is passed in  */
6385 /* but it must not be smaller than the size defined for the type and the    */
6386 /* type must allow for varied sized objects.  The extra requirement here is */
6387 /* that sz must match the size of the object being passed in - this is not  */
6388 /* not possible nor required in ipf_inobj().                                */
6389 /* ------------------------------------------------------------------------ */
6390 int
6391 ipf_inobjsz(softc, data, ptr, type, sz)
6392         ipf_main_softc_t *softc;
6393         void *data;
6394         void *ptr;
6395         int type, sz;
6396 {
6397         ipfobj_t obj;
6398         int error;
6399
6400         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6401                 IPFERROR(56);
6402                 return EINVAL;
6403         }
6404
6405         error = BCOPYIN(data, &obj, sizeof(obj));
6406         if (error != 0) {
6407                 IPFERROR(125);
6408                 return EFAULT;
6409         }
6410
6411         if (obj.ipfo_type != type) {
6412                 IPFERROR(58);
6413                 return EINVAL;
6414         }
6415
6416         if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6417                 if (((ipf_objbytes[type][0] & 1) == 0) ||
6418                     (sz < ipf_objbytes[type][1])) {
6419                         IPFERROR(57);
6420                         return EINVAL;
6421                 }
6422                 error = COPYIN(obj.ipfo_ptr, ptr, sz);
6423                 if (error != 0) {
6424                         IPFERROR(61);
6425                         error = EFAULT;
6426                 }
6427         } else {
6428 #ifdef  IPFILTER_COMPAT
6429                 error = ipf_in_compat(softc, &obj, ptr, sz);
6430 #else
6431                 IPFERROR(60);
6432                 error = EINVAL;
6433 #endif
6434         }
6435         return error;
6436 }
6437
6438
6439 /* ------------------------------------------------------------------------ */
6440 /* Function:    ipf_outobjsz                                                */
6441 /* Returns:     int     - 0 = success, else failure                         */
6442 /* Parameters:  data(I) - pointer to ioctl data                             */
6443 /*              ptr(I)  - pointer to store real data in                     */
6444 /*              type(I) - type of structure being moved                     */
6445 /*              sz(I)   - size of data to copy                              */
6446 /*                                                                          */
6447 /* As per ipf_outobj, except the size of the object to copy out is passed in*/
6448 /* but it must not be smaller than the size defined for the type and the    */
6449 /* type must allow for varied sized objects.  The extra requirement here is */
6450 /* that sz must match the size of the object being passed in - this is not  */
6451 /* not possible nor required in ipf_outobj().                               */
6452 /* ------------------------------------------------------------------------ */
6453 int
6454 ipf_outobjsz(softc, data, ptr, type, sz)
6455         ipf_main_softc_t *softc;
6456         void *data;
6457         void *ptr;
6458         int type, sz;
6459 {
6460         ipfobj_t obj;
6461         int error;
6462
6463         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6464                 IPFERROR(62);
6465                 return EINVAL;
6466         }
6467
6468         error = BCOPYIN(data, &obj, sizeof(obj));
6469         if (error != 0) {
6470                 IPFERROR(127);
6471                 return EFAULT;
6472         }
6473
6474         if (obj.ipfo_type != type) {
6475                 IPFERROR(63);
6476                 return EINVAL;
6477         }
6478
6479         if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6480                 if (((ipf_objbytes[type][0] & 1) == 0) ||
6481                     (sz < ipf_objbytes[type][1])) {
6482                         IPFERROR(146);
6483                         return EINVAL;
6484                 }
6485                 error = COPYOUT(ptr, obj.ipfo_ptr, sz);
6486                 if (error != 0) {
6487                         IPFERROR(66);
6488                         error = EFAULT;
6489                 }
6490         } else {
6491 #ifdef  IPFILTER_COMPAT
6492                 error = ipf_out_compat(softc, &obj, ptr);
6493 #else
6494                 IPFERROR(65);
6495                 error = EINVAL;
6496 #endif
6497         }
6498         return error;
6499 }
6500
6501
6502 /* ------------------------------------------------------------------------ */
6503 /* Function:    ipf_outobj                                                  */
6504 /* Returns:     int     - 0 = success, else failure                         */
6505 /* Parameters:  data(I) - pointer to ioctl data                             */
6506 /*              ptr(I)  - pointer to store real data in                     */
6507 /*              type(I) - type of structure being moved                     */
6508 /*                                                                          */
6509 /* Copy out the contents of what ptr is to where ipfobj points to.  In      */
6510 /* future, we add things to check for version numbers, sizes, etc, to make  */
6511 /* it backward  compatible at the ABI for user land.                        */
6512 /* ------------------------------------------------------------------------ */
6513 int
6514 ipf_outobj(softc, data, ptr, type)
6515         ipf_main_softc_t *softc;
6516         void *data;
6517         void *ptr;
6518         int type;
6519 {
6520         ipfobj_t obj;
6521         int error;
6522
6523         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6524                 IPFERROR(67);
6525                 return EINVAL;
6526         }
6527
6528         error = BCOPYIN(data, &obj, sizeof(obj));
6529         if (error != 0) {
6530                 IPFERROR(126);
6531                 return EFAULT;
6532         }
6533
6534         if (obj.ipfo_type != type) {
6535                 IPFERROR(68);
6536                 return EINVAL;
6537         }
6538
6539         if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6540                 if ((ipf_objbytes[type][0] & 1) != 0) {
6541                         if (obj.ipfo_size < ipf_objbytes[type][1]) {
6542                                 IPFERROR(69);
6543                                 return EINVAL;
6544                         }
6545                 } else if (obj.ipfo_size != ipf_objbytes[type][1]) {
6546                         IPFERROR(70);
6547                         return EINVAL;
6548                 }
6549
6550                 error = COPYOUT(ptr, obj.ipfo_ptr, obj.ipfo_size);
6551                 if (error != 0) {
6552                         IPFERROR(73);
6553                         error = EFAULT;
6554                 }
6555         } else {
6556 #ifdef  IPFILTER_COMPAT
6557                 error = ipf_out_compat(softc, &obj, ptr);
6558 #else
6559                 IPFERROR(72);
6560                 error = EINVAL;
6561 #endif
6562         }
6563         return error;
6564 }
6565
6566
6567 /* ------------------------------------------------------------------------ */
6568 /* Function:    ipf_outobjk                                                 */
6569 /* Returns:     int     - 0 = success, else failure                         */
6570 /* Parameters:  obj(I)  - pointer to data description structure             */
6571 /*              ptr(I)  - pointer to kernel data to copy out                */
6572 /*                                                                          */
6573 /* In the above functions, the ipfobj_t structure is copied into the kernel,*/
6574 /* telling ipfilter how to copy out data. In this instance, the ipfobj_t is */
6575 /* already populated with information and now we just need to use it.       */
6576 /* There is no need for this function to have a "type" parameter as there   */
6577 /* is no point in validating information that comes from the kernel with    */
6578 /* itself.                                                                  */
6579 /* ------------------------------------------------------------------------ */
6580 int
6581 ipf_outobjk(softc, obj, ptr)
6582         ipf_main_softc_t *softc;
6583         ipfobj_t *obj;
6584         void *ptr;
6585 {
6586         int type = obj->ipfo_type;
6587         int error;
6588
6589         if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6590                 IPFERROR(147);
6591                 return EINVAL;
6592         }
6593
6594         if (obj->ipfo_rev >= ipf_objbytes[type][2]) {
6595                 if ((ipf_objbytes[type][0] & 1) != 0) {
6596                         if (obj->ipfo_size < ipf_objbytes[type][1]) {
6597                                 IPFERROR(148);
6598                                 return EINVAL;
6599                         }
6600
6601                 } else if (obj->ipfo_size != ipf_objbytes[type][1]) {
6602                         IPFERROR(149);
6603                         return EINVAL;
6604                 }
6605
6606                 error = COPYOUT(ptr, obj->ipfo_ptr, obj->ipfo_size);
6607                 if (error != 0) {
6608                         IPFERROR(150);
6609                         error = EFAULT;
6610                 }
6611         } else {
6612 #ifdef  IPFILTER_COMPAT
6613                 error = ipf_out_compat(softc, obj, ptr);
6614 #else
6615                 IPFERROR(151);
6616                 error = EINVAL;
6617 #endif
6618         }
6619         return error;
6620 }
6621
6622
6623 /* ------------------------------------------------------------------------ */
6624 /* Function:    ipf_checkl4sum                                              */
6625 /* Returns:     int     - 0 = good, -1 = bad, 1 = cannot check              */
6626 /* Parameters:  fin(I) - pointer to packet information                      */
6627 /*                                                                          */
6628 /* If possible, calculate the layer 4 checksum for the packet.  If this is  */
6629 /* not possible, return without indicating a failure or success but in a    */
6630 /* way that is ditinguishable. This function should only be called by the   */
6631 /* ipf_checkv6sum() for each platform.                                      */
6632 /* ------------------------------------------------------------------------ */
6633 INLINE int
6634 ipf_checkl4sum(fin)
6635         fr_info_t *fin;
6636 {
6637         u_short sum, hdrsum, *csump;
6638         udphdr_t *udp;
6639         int dosum;
6640
6641         /*
6642          * If the TCP packet isn't a fragment, isn't too short and otherwise
6643          * isn't already considered "bad", then validate the checksum.  If
6644          * this check fails then considered the packet to be "bad".
6645          */
6646         if ((fin->fin_flx & (FI_FRAG|FI_SHORT|FI_BAD)) != 0)
6647                 return 1;
6648
6649         csump = NULL;
6650         hdrsum = 0;
6651         dosum = 0;
6652         sum = 0;
6653
6654         switch (fin->fin_p)
6655         {
6656         case IPPROTO_TCP :
6657                 csump = &((tcphdr_t *)fin->fin_dp)->th_sum;
6658                 dosum = 1;
6659                 break;
6660
6661         case IPPROTO_UDP :
6662                 udp = fin->fin_dp;
6663                 if (udp->uh_sum != 0) {
6664                         csump = &udp->uh_sum;
6665                         dosum = 1;
6666                 }
6667                 break;
6668
6669 #ifdef USE_INET6
6670         case IPPROTO_ICMPV6 :
6671                 csump = &((struct icmp6_hdr *)fin->fin_dp)->icmp6_cksum;
6672                 dosum = 1;
6673                 break;
6674 #endif
6675
6676         case IPPROTO_ICMP :
6677                 csump = &((struct icmp *)fin->fin_dp)->icmp_cksum;
6678                 dosum = 1;
6679                 break;
6680
6681         default :
6682                 return 1;
6683                 /*NOTREACHED*/
6684         }
6685
6686         if (csump != NULL)
6687                 hdrsum = *csump;
6688
6689         if (dosum) {
6690                 sum = fr_cksum(fin, fin->fin_ip, fin->fin_p, fin->fin_dp);
6691         }
6692 #if !defined(_KERNEL)
6693         if (sum == hdrsum) {
6694                 FR_DEBUG(("checkl4sum: %hx == %hx\n", sum, hdrsum));
6695         } else {
6696                 FR_DEBUG(("checkl4sum: %hx != %hx\n", sum, hdrsum));
6697         }
6698 #endif
6699         DT2(l4sums, u_short, hdrsum, u_short, sum);
6700         if (hdrsum == sum) {
6701                 fin->fin_cksum = FI_CK_SUMOK;
6702                 return 0;
6703         }
6704         fin->fin_cksum = FI_CK_BAD;
6705         return -1;
6706 }
6707
6708
6709 /* ------------------------------------------------------------------------ */
6710 /* Function:    ipf_ifpfillv4addr                                           */
6711 /* Returns:     int     - 0 = address update, -1 = address not updated      */
6712 /* Parameters:  atype(I)   - type of network address update to perform      */
6713 /*              sin(I)     - pointer to source of address information       */
6714 /*              mask(I)    - pointer to source of netmask information       */
6715 /*              inp(I)     - pointer to destination address store           */
6716 /*              inpmask(I) - pointer to destination netmask store           */
6717 /*                                                                          */
6718 /* Given a type of network address update (atype) to perform, copy          */
6719 /* information from sin/mask into inp/inpmask.  If ipnmask is NULL then no  */
6720 /* netmask update is performed unless FRI_NETMASKED is passed as atype, in  */
6721 /* which case the operation fails.  For all values of atype other than      */
6722 /* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s  */
6723 /* value.                                                                   */
6724 /* ------------------------------------------------------------------------ */
6725 int
6726 ipf_ifpfillv4addr(atype, sin, mask, inp, inpmask)
6727         int atype;
6728         struct sockaddr_in *sin, *mask;
6729         struct in_addr *inp, *inpmask;
6730 {
6731         if (inpmask != NULL && atype != FRI_NETMASKED)
6732                 inpmask->s_addr = 0xffffffff;
6733
6734         if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
6735                 if (atype == FRI_NETMASKED) {
6736                         if (inpmask == NULL)
6737                                 return -1;
6738                         inpmask->s_addr = mask->sin_addr.s_addr;
6739                 }
6740                 inp->s_addr = sin->sin_addr.s_addr & mask->sin_addr.s_addr;
6741         } else {
6742                 inp->s_addr = sin->sin_addr.s_addr;
6743         }
6744         return 0;
6745 }
6746
6747
6748 #ifdef  USE_INET6
6749 /* ------------------------------------------------------------------------ */
6750 /* Function:    ipf_ifpfillv6addr                                           */
6751 /* Returns:     int     - 0 = address update, -1 = address not updated      */
6752 /* Parameters:  atype(I)   - type of network address update to perform      */
6753 /*              sin(I)     - pointer to source of address information       */
6754 /*              mask(I)    - pointer to source of netmask information       */
6755 /*              inp(I)     - pointer to destination address store           */
6756 /*              inpmask(I) - pointer to destination netmask store           */
6757 /*                                                                          */
6758 /* Given a type of network address update (atype) to perform, copy          */
6759 /* information from sin/mask into inp/inpmask.  If ipnmask is NULL then no  */
6760 /* netmask update is performed unless FRI_NETMASKED is passed as atype, in  */
6761 /* which case the operation fails.  For all values of atype other than      */
6762 /* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s  */
6763 /* value.                                                                   */
6764 /* ------------------------------------------------------------------------ */
6765 int
6766 ipf_ifpfillv6addr(atype, sin, mask, inp, inpmask)
6767         int atype;
6768         struct sockaddr_in6 *sin, *mask;
6769         i6addr_t *inp, *inpmask;
6770 {
6771         i6addr_t *src, *and;
6772
6773         src = (i6addr_t *)&sin->sin6_addr;
6774         and = (i6addr_t *)&mask->sin6_addr;
6775
6776         if (inpmask != NULL && atype != FRI_NETMASKED) {
6777                 inpmask->i6[0] = 0xffffffff;
6778                 inpmask->i6[1] = 0xffffffff;
6779                 inpmask->i6[2] = 0xffffffff;
6780                 inpmask->i6[3] = 0xffffffff;
6781         }
6782
6783         if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
6784                 if (atype == FRI_NETMASKED) {
6785                         if (inpmask == NULL)
6786                                 return -1;
6787                         inpmask->i6[0] = and->i6[0];
6788                         inpmask->i6[1] = and->i6[1];
6789                         inpmask->i6[2] = and->i6[2];
6790                         inpmask->i6[3] = and->i6[3];
6791                 }
6792
6793                 inp->i6[0] = src->i6[0] & and->i6[0];
6794                 inp->i6[1] = src->i6[1] & and->i6[1];
6795                 inp->i6[2] = src->i6[2] & and->i6[2];
6796                 inp->i6[3] = src->i6[3] & and->i6[3];
6797         } else {
6798                 inp->i6[0] = src->i6[0];
6799                 inp->i6[1] = src->i6[1];
6800                 inp->i6[2] = src->i6[2];
6801                 inp->i6[3] = src->i6[3];
6802         }
6803         return 0;
6804 }
6805 #endif
6806
6807
6808 /* ------------------------------------------------------------------------ */
6809 /* Function:    ipf_matchtag                                                */
6810 /* Returns:     0 == mismatch, 1 == match.                                  */
6811 /* Parameters:  tag1(I) - pointer to first tag to compare                   */
6812 /*              tag2(I) - pointer to second tag to compare                  */
6813 /*                                                                          */
6814 /* Returns true (non-zero) or false(0) if the two tag structures can be     */
6815 /* considered to be a match or not match, respectively.  The tag is 16      */
6816 /* bytes long (16 characters) but that is overlayed with 4 32bit ints so    */
6817 /* compare the ints instead, for speed. tag1 is the master of the           */
6818 /* comparison.  This function should only be called with both tag1 and tag2 */
6819 /* as non-NULL pointers.                                                    */
6820 /* ------------------------------------------------------------------------ */
6821 int
6822 ipf_matchtag(tag1, tag2)
6823         ipftag_t *tag1, *tag2;
6824 {
6825         if (tag1 == tag2)
6826                 return 1;
6827
6828         if ((tag1->ipt_num[0] == 0) && (tag2->ipt_num[0] == 0))
6829                 return 1;
6830
6831         if ((tag1->ipt_num[0] == tag2->ipt_num[0]) &&
6832             (tag1->ipt_num[1] == tag2->ipt_num[1]) &&
6833             (tag1->ipt_num[2] == tag2->ipt_num[2]) &&
6834             (tag1->ipt_num[3] == tag2->ipt_num[3]))
6835                 return 1;
6836         return 0;
6837 }
6838
6839
6840 /* ------------------------------------------------------------------------ */
6841 /* Function:    ipf_coalesce                                                */
6842 /* Returns:     1 == success, -1 == failure, 0 == no change                 */
6843 /* Parameters:  fin(I) - pointer to packet information                      */
6844 /*                                                                          */
6845 /* Attempt to get all of the packet data into a single, contiguous buffer.  */
6846 /* If this call returns a failure then the buffers have also been freed.    */
6847 /* ------------------------------------------------------------------------ */
6848 int
6849 ipf_coalesce(fin)
6850         fr_info_t *fin;
6851 {
6852
6853         if ((fin->fin_flx & FI_COALESCE) != 0)
6854                 return 1;
6855
6856         /*
6857          * If the mbuf pointers indicate that there is no mbuf to work with,
6858          * return but do not indicate success or failure.
6859          */
6860         if (fin->fin_m == NULL || fin->fin_mp == NULL)
6861                 return 0;
6862
6863 #if defined(_KERNEL)
6864         if (ipf_pullup(fin->fin_m, fin, fin->fin_plen) == NULL) {
6865                 ipf_main_softc_t *softc = fin->fin_main_soft;
6866
6867                 DT1(frb_coalesce, fr_info_t *, fin);
6868                 LBUMP(ipf_stats[fin->fin_out].fr_badcoalesces);
6869 # ifdef MENTAT
6870                 FREE_MB_T(*fin->fin_mp);
6871 # endif
6872                 fin->fin_reason = FRB_COALESCE;
6873                 *fin->fin_mp = NULL;
6874                 fin->fin_m = NULL;
6875                 return -1;
6876         }
6877 #else
6878         fin = fin;      /* LINT */
6879 #endif
6880         return 1;
6881 }
6882
6883
6884 /*
6885  * The following table lists all of the tunable variables that can be
6886  * accessed via SIOCIPFGET/SIOCIPFSET/SIOCIPFGETNEXt.  The format of each row
6887  * in the table below is as follows:
6888  *
6889  * pointer to value, name of value, minimum, maximum, size of the value's
6890  *     container, value attribute flags
6891  *
6892  * For convienience, IPFT_RDONLY means the value is read-only, IPFT_WRDISABLED
6893  * means the value can only be written to when IPFilter is loaded but disabled.
6894  * The obvious implication is if neither of these are set then the value can be
6895  * changed at any time without harm.
6896  */
6897
6898
6899 /* ------------------------------------------------------------------------ */
6900 /* Function:    ipf_tune_findbycookie                                       */
6901 /* Returns:     NULL = search failed, else pointer to tune struct           */
6902 /* Parameters:  cookie(I) - cookie value to search for amongst tuneables    */
6903 /*              next(O)   - pointer to place to store the cookie for the    */
6904 /*                          "next" tuneable, if it is desired.              */
6905 /*                                                                          */
6906 /* This function is used to walk through all of the existing tunables with  */
6907 /* successive calls.  It searches the known tunables for the one which has  */
6908 /* a matching value for "cookie" - ie its address.  When returning a match, */
6909 /* the next one to be found may be returned inside next.                    */
6910 /* ------------------------------------------------------------------------ */
6911 static ipftuneable_t *
6912 ipf_tune_findbycookie(ptop, cookie, next)
6913         ipftuneable_t **ptop;
6914         void *cookie, **next;
6915 {
6916         ipftuneable_t *ta, **tap;
6917
6918         for (ta = *ptop; ta->ipft_name != NULL; ta++)
6919                 if (ta == cookie) {
6920                         if (next != NULL) {
6921                                 /*
6922                                  * If the next entry in the array has a name
6923                                  * present, then return a pointer to it for
6924                                  * where to go next, else return a pointer to
6925                                  * the dynaminc list as a key to search there
6926                                  * next.  This facilitates a weak linking of
6927                                  * the two "lists" together.
6928                                  */
6929                                 if ((ta + 1)->ipft_name != NULL)
6930                                         *next = ta + 1;
6931                                 else
6932                                         *next = ptop;
6933                         }
6934                         return ta;
6935                 }
6936
6937         for (tap = ptop; (ta = *tap) != NULL; tap = &ta->ipft_next)
6938                 if (tap == cookie) {
6939                         if (next != NULL)
6940                                 *next = &ta->ipft_next;
6941                         return ta;
6942                 }
6943
6944         if (next != NULL)
6945                 *next = NULL;
6946         return NULL;
6947 }
6948
6949
6950 /* ------------------------------------------------------------------------ */
6951 /* Function:    ipf_tune_findbyname                                         */
6952 /* Returns:     NULL = search failed, else pointer to tune struct           */
6953 /* Parameters:  name(I) - name of the tuneable entry to find.               */
6954 /*                                                                          */
6955 /* Search the static array of tuneables and the list of dynamic tuneables   */
6956 /* for an entry with a matching name.  If we can find one, return a pointer */
6957 /* to the matching structure.                                               */
6958 /* ------------------------------------------------------------------------ */
6959 static ipftuneable_t *
6960 ipf_tune_findbyname(top, name)
6961         ipftuneable_t *top;
6962         const char *name;
6963 {
6964         ipftuneable_t *ta;
6965
6966         for (ta = top; ta != NULL; ta = ta->ipft_next)
6967                 if (!strcmp(ta->ipft_name, name)) {
6968                         return ta;
6969                 }
6970
6971         return NULL;
6972 }
6973
6974
6975 /* ------------------------------------------------------------------------ */
6976 /* Function:    ipf_tune_add_array                                          */
6977 /* Returns:     int - 0 == success, else failure                            */
6978 /* Parameters:  newtune - pointer to new tune array to add to tuneables     */
6979 /*                                                                          */
6980 /* Appends tune structures from the array passed in (newtune) to the end of */
6981 /* the current list of "dynamic" tuneable parameters.                       */
6982 /* If any entry to be added is already present (by name) then the operation */
6983 /* is aborted - entries that have been added are removed before returning.  */
6984 /* An entry with no name (NULL) is used as the indication that the end of   */
6985 /* the array has been reached.                                              */
6986 /* ------------------------------------------------------------------------ */
6987 int
6988 ipf_tune_add_array(softc, newtune)
6989         ipf_main_softc_t *softc;
6990         ipftuneable_t *newtune;
6991 {
6992         ipftuneable_t *nt, *dt;
6993         int error = 0;
6994
6995         for (nt = newtune; nt->ipft_name != NULL; nt++) {
6996                 error = ipf_tune_add(softc, nt);
6997                 if (error != 0) {
6998                         for (dt = newtune; dt != nt; dt++) {
6999                                 (void) ipf_tune_del(softc, dt);
7000                         }
7001                 }
7002         }
7003
7004         return error;
7005 }
7006
7007
7008 /* ------------------------------------------------------------------------ */
7009 /* Function:    ipf_tune_array_link                                         */
7010 /* Returns:     0 == success, -1 == failure                                 */
7011 /* Parameters:  softc(I) - soft context pointerto work with                 */
7012 /*              array(I) - pointer to an array of tuneables                 */
7013 /*                                                                          */
7014 /* Given an array of tunables (array), append them to the current list of   */
7015 /* tuneables for this context (softc->ipf_tuners.) To properly prepare the  */
7016 /* the array for being appended to the list, initialise all of the next     */
7017 /* pointers so we don't need to walk parts of it with ++ and others with    */
7018 /* next. The array is expected to have an entry with a NULL name as the     */
7019 /* terminator. Trying to add an array with no non-NULL names will return as */
7020 /* a failure.                                                               */
7021 /* ------------------------------------------------------------------------ */
7022 int
7023 ipf_tune_array_link(softc, array)
7024         ipf_main_softc_t *softc;
7025         ipftuneable_t *array;
7026 {
7027         ipftuneable_t *t, **p;
7028
7029         t = array;
7030         if (t->ipft_name == NULL)
7031                 return -1;
7032
7033         for (; t[1].ipft_name != NULL; t++)
7034                 t[0].ipft_next = &t[1];
7035         t->ipft_next = NULL;
7036
7037         /*
7038          * Since a pointer to the last entry isn't kept, we need to find it
7039          * each time we want to add new variables to the list.
7040          */
7041         for (p = &softc->ipf_tuners; (t = *p) != NULL; p = &t->ipft_next)
7042                 if (t->ipft_name == NULL)
7043                         break;
7044         *p = array;
7045
7046         return 0;
7047 }
7048
7049
7050 /* ------------------------------------------------------------------------ */
7051 /* Function:    ipf_tune_array_unlink                                       */
7052 /* Returns:     0 == success, -1 == failure                                 */
7053 /* Parameters:  softc(I) - soft context pointerto work with                 */
7054 /*              array(I) - pointer to an array of tuneables                 */
7055 /*                                                                          */
7056 /* ------------------------------------------------------------------------ */
7057 int
7058 ipf_tune_array_unlink(softc, array)
7059         ipf_main_softc_t *softc;
7060         ipftuneable_t *array;
7061 {
7062         ipftuneable_t *t, **p;
7063
7064         for (p = &softc->ipf_tuners; (t = *p) != NULL; p = &t->ipft_next)
7065                 if (t == array)
7066                         break;
7067         if (t == NULL)
7068                 return -1;
7069
7070         for (; t[1].ipft_name != NULL; t++)
7071                 ;
7072
7073         *p = t->ipft_next;
7074
7075         return 0;
7076 }
7077
7078
7079 /* ------------------------------------------------------------------------ */
7080 /* Function:   ipf_tune_array_copy                                          */
7081 /* Returns:    NULL = failure, else pointer to new array                    */
7082 /* Parameters: base(I)     - pointer to structure base                      */
7083 /*             size(I)     - size of the array at template                  */
7084 /*             template(I) - original array to copy                         */
7085 /*                                                                          */
7086 /* Allocate memory for a new set of tuneable values and copy everything     */
7087 /* from template into the new region of memory.  The new region is full of  */
7088 /* uninitialised pointers (ipft_next) so set them up.  Now, ipftp_offset... */
7089 /*                                                                          */
7090 /* NOTE: the following assumes that sizeof(long) == sizeof(void *)          */
7091 /* In the array template, ipftp_offset is the offset (in bytes) of the      */
7092 /* location of the tuneable value inside the structure pointed to by base.  */
7093 /* As ipftp_offset is a union over the pointers to the tuneable values, if  */
7094 /* we add base to the copy's ipftp_offset, copy ends up with a pointer in   */
7095 /* ipftp_void that points to the stored value.                              */
7096 /* ------------------------------------------------------------------------ */
7097 ipftuneable_t *
7098 ipf_tune_array_copy(base, size, template)
7099         void *base;
7100         size_t size;
7101         ipftuneable_t *template;
7102 {
7103         ipftuneable_t *copy;
7104         int i;
7105
7106
7107         KMALLOCS(copy, ipftuneable_t *, size);
7108         if (copy == NULL) {
7109                 return NULL;
7110         }
7111         bcopy(template, copy, size);
7112
7113         for (i = 0; copy[i].ipft_name; i++) {
7114                 copy[i].ipft_una.ipftp_offset += (u_long)base;
7115                 copy[i].ipft_next = copy + i + 1;
7116         }
7117
7118         return copy;
7119 }
7120
7121
7122 /* ------------------------------------------------------------------------ */
7123 /* Function:    ipf_tune_add                                                */
7124 /* Returns:     int - 0 == success, else failure                            */
7125 /* Parameters:  newtune - pointer to new tune entry to add to tuneables     */
7126 /*                                                                          */
7127 /* Appends tune structures from the array passed in (newtune) to the end of */
7128 /* the current list of "dynamic" tuneable parameters.  Once added, the      */
7129 /* owner of the object is not expected to ever change "ipft_next".          */
7130 /* ------------------------------------------------------------------------ */
7131 int
7132 ipf_tune_add(softc, newtune)
7133         ipf_main_softc_t *softc;
7134         ipftuneable_t *newtune;
7135 {
7136         ipftuneable_t *ta, **tap;
7137
7138         ta = ipf_tune_findbyname(softc->ipf_tuners, newtune->ipft_name);
7139         if (ta != NULL) {
7140                 IPFERROR(74);
7141                 return EEXIST;
7142         }
7143
7144         for (tap = &softc->ipf_tuners; *tap != NULL; tap = &(*tap)->ipft_next)
7145                 ;
7146
7147         newtune->ipft_next = NULL;
7148         *tap = newtune;
7149         return 0;
7150 }
7151
7152
7153 /* ------------------------------------------------------------------------ */
7154 /* Function:    ipf_tune_del                                                */
7155 /* Returns:     int - 0 == success, else failure                            */
7156 /* Parameters:  oldtune - pointer to tune entry to remove from the list of  */
7157 /*                        current dynamic tuneables                         */
7158 /*                                                                          */
7159 /* Search for the tune structure, by pointer, in the list of those that are */
7160 /* dynamically added at run time.  If found, adjust the list so that this   */
7161 /* structure is no longer part of it.                                       */
7162 /* ------------------------------------------------------------------------ */
7163 int
7164 ipf_tune_del(softc, oldtune)
7165         ipf_main_softc_t *softc;
7166         ipftuneable_t *oldtune;
7167 {
7168         ipftuneable_t *ta, **tap;
7169         int error = 0;
7170
7171         for (tap = &softc->ipf_tuners; (ta = *tap) != NULL;
7172              tap = &ta->ipft_next) {
7173                 if (ta == oldtune) {
7174                         *tap = oldtune->ipft_next;
7175                         oldtune->ipft_next = NULL;
7176                         break;
7177                 }
7178         }
7179
7180         if (ta == NULL) {
7181                 error = ESRCH;
7182                 IPFERROR(75);
7183         }
7184         return error;
7185 }
7186
7187
7188 /* ------------------------------------------------------------------------ */
7189 /* Function:    ipf_tune_del_array                                          */
7190 /* Returns:     int - 0 == success, else failure                            */
7191 /* Parameters:  oldtune - pointer to tuneables array                        */
7192 /*                                                                          */
7193 /* Remove each tuneable entry in the array from the list of "dynamic"       */
7194 /* tunables.  If one entry should fail to be found, an error will be        */
7195 /* returned and no further ones removed.                                    */
7196 /* An entry with a NULL name is used as the indicator of the last entry in  */
7197 /* the array.                                                               */
7198 /* ------------------------------------------------------------------------ */
7199 int
7200 ipf_tune_del_array(softc, oldtune)
7201         ipf_main_softc_t *softc;
7202         ipftuneable_t *oldtune;
7203 {
7204         ipftuneable_t *ot;
7205         int error = 0;
7206
7207         for (ot = oldtune; ot->ipft_name != NULL; ot++) {
7208                 error = ipf_tune_del(softc, ot);
7209                 if (error != 0)
7210                         break;
7211         }
7212
7213         return error;
7214
7215 }
7216
7217
7218 /* ------------------------------------------------------------------------ */
7219 /* Function:    ipf_tune                                                    */
7220 /* Returns:     int - 0 == success, else failure                            */
7221 /* Parameters:  cmd(I)  - ioctl command number                              */
7222 /*              data(I) - pointer to ioctl data structure                   */
7223 /*                                                                          */
7224 /* Implement handling of SIOCIPFGETNEXT, SIOCIPFGET and SIOCIPFSET.  These  */
7225 /* three ioctls provide the means to access and control global variables    */
7226 /* within IPFilter, allowing (for example) timeouts and table sizes to be   */
7227 /* changed without rebooting, reloading or recompiling.  The initialisation */
7228 /* and 'destruction' routines of the various components of ipfilter are all */
7229 /* each responsible for handling their own values being too big.            */
7230 /* ------------------------------------------------------------------------ */
7231 int
7232 ipf_ipftune(softc, cmd, data)
7233         ipf_main_softc_t *softc;
7234         ioctlcmd_t cmd;
7235         void *data;
7236 {
7237         ipftuneable_t *ta;
7238         ipftune_t tu;
7239         void *cookie;
7240         int error;
7241
7242         error = ipf_inobj(softc, data, NULL, &tu, IPFOBJ_TUNEABLE);
7243         if (error != 0)
7244                 return error;
7245
7246         tu.ipft_name[sizeof(tu.ipft_name) - 1] = '\0';
7247         cookie = tu.ipft_cookie;
7248         ta = NULL;
7249
7250         switch (cmd)
7251         {
7252         case SIOCIPFGETNEXT :
7253                 /*
7254                  * If cookie is non-NULL, assume it to be a pointer to the last
7255                  * entry we looked at, so find it (if possible) and return a
7256                  * pointer to the next one after it.  The last entry in the
7257                  * the table is a NULL entry, so when we get to it, set cookie
7258                  * to NULL and return that, indicating end of list, erstwhile
7259                  * if we come in with cookie set to NULL, we are starting anew
7260                  * at the front of the list.
7261                  */
7262                 if (cookie != NULL) {
7263                         ta = ipf_tune_findbycookie(&softc->ipf_tuners,
7264                                                    cookie, &tu.ipft_cookie);
7265                 } else {
7266                         ta = softc->ipf_tuners;
7267                         tu.ipft_cookie = ta + 1;
7268                 }
7269                 if (ta != NULL) {
7270                         /*
7271                          * Entry found, but does the data pointed to by that
7272                          * row fit in what we can return?
7273                          */
7274                         if (ta->ipft_sz > sizeof(tu.ipft_un)) {
7275                                 IPFERROR(76);
7276                                 return EINVAL;
7277                         }
7278
7279                         tu.ipft_vlong = 0;
7280                         if (ta->ipft_sz == sizeof(u_long))
7281                                 tu.ipft_vlong = *ta->ipft_plong;
7282                         else if (ta->ipft_sz == sizeof(u_int))
7283                                 tu.ipft_vint = *ta->ipft_pint;
7284                         else if (ta->ipft_sz == sizeof(u_short))
7285                                 tu.ipft_vshort = *ta->ipft_pshort;
7286                         else if (ta->ipft_sz == sizeof(u_char))
7287                                 tu.ipft_vchar = *ta->ipft_pchar;
7288
7289                         tu.ipft_sz = ta->ipft_sz;
7290                         tu.ipft_min = ta->ipft_min;
7291                         tu.ipft_max = ta->ipft_max;
7292                         tu.ipft_flags = ta->ipft_flags;
7293                         bcopy(ta->ipft_name, tu.ipft_name,
7294                               MIN(sizeof(tu.ipft_name),
7295                                   strlen(ta->ipft_name) + 1));
7296                 }
7297                 error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7298                 break;
7299
7300         case SIOCIPFGET :
7301         case SIOCIPFSET :
7302                 /*
7303                  * Search by name or by cookie value for a particular entry
7304                  * in the tuning paramter table.
7305                  */
7306                 IPFERROR(77);
7307                 error = ESRCH;
7308                 if (cookie != NULL) {
7309                         ta = ipf_tune_findbycookie(&softc->ipf_tuners,
7310                                                    cookie, NULL);
7311                         if (ta != NULL)
7312                                 error = 0;
7313                 } else if (tu.ipft_name[0] != '\0') {
7314                         ta = ipf_tune_findbyname(softc->ipf_tuners,
7315                                                  tu.ipft_name);
7316                         if (ta != NULL)
7317                                 error = 0;
7318                 }
7319                 if (error != 0)
7320                         break;
7321
7322                 if (cmd == (ioctlcmd_t)SIOCIPFGET) {
7323                         /*
7324                          * Fetch the tuning parameters for a particular value
7325                          */
7326                         tu.ipft_vlong = 0;
7327                         if (ta->ipft_sz == sizeof(u_long))
7328                                 tu.ipft_vlong = *ta->ipft_plong;
7329                         else if (ta->ipft_sz == sizeof(u_int))
7330                                 tu.ipft_vint = *ta->ipft_pint;
7331                         else if (ta->ipft_sz == sizeof(u_short))
7332                                 tu.ipft_vshort = *ta->ipft_pshort;
7333                         else if (ta->ipft_sz == sizeof(u_char))
7334                                 tu.ipft_vchar = *ta->ipft_pchar;
7335                         tu.ipft_cookie = ta;
7336                         tu.ipft_sz = ta->ipft_sz;
7337                         tu.ipft_min = ta->ipft_min;
7338                         tu.ipft_max = ta->ipft_max;
7339                         tu.ipft_flags = ta->ipft_flags;
7340                         error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7341
7342                 } else if (cmd == (ioctlcmd_t)SIOCIPFSET) {
7343                         /*
7344                          * Set an internal parameter.  The hard part here is
7345                          * getting the new value safely and correctly out of
7346                          * the kernel (given we only know its size, not type.)
7347                          */
7348                         u_long in;
7349
7350                         if (((ta->ipft_flags & IPFT_WRDISABLED) != 0) &&
7351                             (softc->ipf_running > 0)) {
7352                                 IPFERROR(78);
7353                                 error = EBUSY;
7354                                 break;
7355                         }
7356
7357                         in = tu.ipft_vlong;
7358                         if (in < ta->ipft_min || in > ta->ipft_max) {
7359                                 IPFERROR(79);
7360                                 error = EINVAL;
7361                                 break;
7362                         }
7363
7364                         if (ta->ipft_func != NULL) {
7365                                 SPL_INT(s);
7366
7367                                 SPL_NET(s);
7368                                 error = (*ta->ipft_func)(softc, ta,
7369                                                          &tu.ipft_un);
7370                                 SPL_X(s);
7371
7372                         } else if (ta->ipft_sz == sizeof(u_long)) {
7373                                 tu.ipft_vlong = *ta->ipft_plong;
7374                                 *ta->ipft_plong = in;
7375
7376                         } else if (ta->ipft_sz == sizeof(u_int)) {
7377                                 tu.ipft_vint = *ta->ipft_pint;
7378                                 *ta->ipft_pint = (u_int)(in & 0xffffffff);
7379
7380                         } else if (ta->ipft_sz == sizeof(u_short)) {
7381                                 tu.ipft_vshort = *ta->ipft_pshort;
7382                                 *ta->ipft_pshort = (u_short)(in & 0xffff);
7383
7384                         } else if (ta->ipft_sz == sizeof(u_char)) {
7385                                 tu.ipft_vchar = *ta->ipft_pchar;
7386                                 *ta->ipft_pchar = (u_char)(in & 0xff);
7387                         }
7388                         error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7389                 }
7390                 break;
7391
7392         default :
7393                 IPFERROR(80);
7394                 error = EINVAL;
7395                 break;
7396         }
7397
7398         return error;
7399 }
7400
7401
7402 /* ------------------------------------------------------------------------ */
7403 /* Function:    ipf_zerostats                                               */
7404 /* Returns:     int - 0 = success, else failure                             */
7405 /* Parameters:  data(O) - pointer to pointer for copying data back to       */
7406 /*                                                                          */
7407 /* Copies the current statistics out to userspace and then zero's the       */
7408 /* current ones in the kernel. The lock is only held across the bzero() as  */
7409 /* the copyout may result in paging (ie network activity.)                  */
7410 /* ------------------------------------------------------------------------ */
7411 int
7412 ipf_zerostats(softc, data)
7413         ipf_main_softc_t *softc;
7414         caddr_t data;
7415 {
7416         friostat_t fio;
7417         ipfobj_t obj;
7418         int error;
7419
7420         error = ipf_inobj(softc, data, &obj, &fio, IPFOBJ_IPFSTAT);
7421         if (error != 0)
7422                 return error;
7423         ipf_getstat(softc, &fio, obj.ipfo_rev);
7424         error = ipf_outobj(softc, data, &fio, IPFOBJ_IPFSTAT);
7425         if (error != 0)
7426                 return error;
7427
7428         WRITE_ENTER(&softc->ipf_mutex);
7429         bzero(&softc->ipf_stats, sizeof(softc->ipf_stats));
7430         RWLOCK_EXIT(&softc->ipf_mutex);
7431
7432         return 0;
7433 }
7434
7435
7436 /* ------------------------------------------------------------------------ */
7437 /* Function:    ipf_resolvedest                                             */
7438 /* Returns:     Nil                                                         */
7439 /* Parameters:  softc(I) - pointer to soft context main structure           */
7440 /*              base(I)  - where strings are stored                         */
7441 /*              fdp(IO)  - pointer to destination information to resolve    */
7442 /*              v(I)     - IP protocol version to match                     */
7443 /*                                                                          */
7444 /* Looks up an interface name in the frdest structure pointed to by fdp and */
7445 /* if a matching name can be found for the particular IP protocol version   */
7446 /* then store the interface pointer in the frdest struct.  If no match is   */
7447 /* found, then set the interface pointer to be -1 as NULL is considered to  */
7448 /* indicate there is no information at all in the structure.                */
7449 /* ------------------------------------------------------------------------ */
7450 int
7451 ipf_resolvedest(softc, base, fdp, v)
7452         ipf_main_softc_t *softc;
7453         char *base;
7454         frdest_t *fdp;
7455         int v;
7456 {
7457         int errval = 0;
7458         void *ifp;
7459
7460         ifp = NULL;
7461
7462         if (fdp->fd_name != -1) {
7463                 if (fdp->fd_type == FRD_DSTLIST) {
7464                         ifp = ipf_lookup_res_name(softc, IPL_LOGIPF,
7465                                                   IPLT_DSTLIST,
7466                                                   base + fdp->fd_name,
7467                                                   NULL);
7468                         if (ifp == NULL) {
7469                                 IPFERROR(144);
7470                                 errval = ESRCH;
7471                         }
7472                 } else {
7473                         ifp = GETIFP(base + fdp->fd_name, v);
7474                         if (ifp == NULL)
7475                                 ifp = (void *)-1;
7476                 }
7477         }
7478         fdp->fd_ptr = ifp;
7479
7480         if ((ifp != NULL) && (ifp != (void *)-1)) {
7481                 fdp->fd_local = ipf_deliverlocal(softc, v, ifp, &fdp->fd_ip6);
7482         }
7483
7484         return errval;
7485 }
7486
7487
7488 /* ------------------------------------------------------------------------ */
7489 /* Function:    ipf_resolvenic                                              */
7490 /* Returns:     void* - NULL = wildcard name, -1 = failed to find NIC, else */
7491 /*                      pointer to interface structure for NIC              */
7492 /* Parameters:  softc(I)- pointer to soft context main structure            */
7493 /*              name(I) - complete interface name                           */
7494 /*              v(I)    - IP protocol version                               */
7495 /*                                                                          */
7496 /* Look for a network interface structure that firstly has a matching name  */
7497 /* to that passed in and that is also being used for that IP protocol       */
7498 /* version (necessary on some platforms where there are separate listings   */
7499 /* for both IPv4 and IPv6 on the same physical NIC.                         */
7500 /* ------------------------------------------------------------------------ */
7501 void *
7502 ipf_resolvenic(softc, name, v)
7503         ipf_main_softc_t *softc;
7504         char *name;
7505         int v;
7506 {
7507         void *nic;
7508
7509         softc = softc;  /* gcc -Wextra */
7510         if (name[0] == '\0')
7511                 return NULL;
7512
7513         if ((name[1] == '\0') && ((name[0] == '-') || (name[0] == '*'))) {
7514                 return NULL;
7515         }
7516
7517         nic = GETIFP(name, v);
7518         if (nic == NULL)
7519                 nic = (void *)-1;
7520         return nic;
7521 }
7522
7523
7524 /* ------------------------------------------------------------------------ */
7525 /* Function:    ipf_token_expire                                            */
7526 /* Returns:     None.                                                       */
7527 /* Parameters:  softc(I) - pointer to soft context main structure           */
7528 /*                                                                          */
7529 /* This function is run every ipf tick to see if there are any tokens that  */
7530 /* have been held for too long and need to be freed up.                     */
7531 /* ------------------------------------------------------------------------ */
7532 void
7533 ipf_token_expire(softc)
7534         ipf_main_softc_t *softc;
7535 {
7536         ipftoken_t *it;
7537
7538         WRITE_ENTER(&softc->ipf_tokens);
7539         while ((it = softc->ipf_token_head) != NULL) {
7540                 if (it->ipt_die > softc->ipf_ticks)
7541                         break;
7542
7543                 ipf_token_deref(softc, it);
7544         }
7545         RWLOCK_EXIT(&softc->ipf_tokens);
7546 }
7547
7548
7549 /* ------------------------------------------------------------------------ */
7550 /* Function:    ipf_token_flush                                             */
7551 /* Returns:     None.                                                       */
7552 /* Parameters:  softc(I) - pointer to soft context main structure           */
7553 /*                                                                          */
7554 /* Loop through all of the existing tokens and call deref to see if they    */
7555 /* can be freed. Normally a function like this might just loop on           */
7556 /* ipf_token_head but there is a chance that a token might have a ref count */
7557 /* of greater than one and in that case the the reference would drop twice  */
7558 /* by code that is only entitled to drop it once.                           */
7559 /* ------------------------------------------------------------------------ */
7560 static void
7561 ipf_token_flush(softc)
7562         ipf_main_softc_t *softc;
7563 {
7564         ipftoken_t *it, *next;
7565
7566         WRITE_ENTER(&softc->ipf_tokens);
7567         for (it = softc->ipf_token_head; it != NULL; it = next) {
7568                 next = it->ipt_next;
7569                 (void) ipf_token_deref(softc, it);
7570         }
7571         RWLOCK_EXIT(&softc->ipf_tokens);
7572 }
7573
7574
7575 /* ------------------------------------------------------------------------ */
7576 /* Function:    ipf_token_del                                               */
7577 /* Returns:     int     - 0 = success, else error                           */
7578 /* Parameters:  softc(I)- pointer to soft context main structure            */
7579 /*              type(I) - the token type to match                           */
7580 /*              uid(I)  - uid owning the token                              */
7581 /*              ptr(I)  - context pointer for the token                     */
7582 /*                                                                          */
7583 /* This function looks for a a token in the current list that matches up    */
7584 /* the fields (type, uid, ptr).  If none is found, ESRCH is returned, else  */
7585 /* call ipf_token_dewref() to remove it from the list. In the event that    */
7586 /* the token has a reference held elsewhere, setting ipt_complete to 2      */
7587 /* enables debugging to distinguish between the two paths that ultimately   */
7588 /* lead to a token to be deleted.                                           */
7589 /* ------------------------------------------------------------------------ */
7590 int
7591 ipf_token_del(softc, type, uid, ptr)
7592         ipf_main_softc_t *softc;
7593         int type, uid;
7594         void *ptr;
7595 {
7596         ipftoken_t *it;
7597         int error;
7598
7599         IPFERROR(82);
7600         error = ESRCH;
7601
7602         WRITE_ENTER(&softc->ipf_tokens);
7603         for (it = softc->ipf_token_head; it != NULL; it = it->ipt_next) {
7604                 if (ptr == it->ipt_ctx && type == it->ipt_type &&
7605                     uid == it->ipt_uid) {
7606                         it->ipt_complete = 2;
7607                         ipf_token_deref(softc, it);
7608                         error = 0;
7609                         break;
7610                 }
7611         }
7612         RWLOCK_EXIT(&softc->ipf_tokens);
7613
7614         return error;
7615 }
7616
7617
7618 /* ------------------------------------------------------------------------ */
7619 /* Function:    ipf_token_mark_complete                                     */
7620 /* Returns:     None.                                                       */
7621 /* Parameters:  token(I) - pointer to token structure                       */
7622 /*                                                                          */
7623 /* Mark a token as being ineligable for being found with ipf_token_find.    */
7624 /* ------------------------------------------------------------------------ */
7625 void
7626 ipf_token_mark_complete(token)
7627         ipftoken_t *token;
7628 {
7629         if (token->ipt_complete == 0)
7630                 token->ipt_complete = 1;
7631 }
7632
7633
7634 /* ------------------------------------------------------------------------ */
7635 /* Function:    ipf_token_find                                               */
7636 /* Returns:     ipftoken_t * - NULL if no memory, else pointer to token     */
7637 /* Parameters:  softc(I)- pointer to soft context main structure            */
7638 /*              type(I) - the token type to match                           */
7639 /*              uid(I)  - uid owning the token                              */
7640 /*              ptr(I)  - context pointer for the token                     */
7641 /*                                                                          */
7642 /* This function looks for a live token in the list of current tokens that  */
7643 /* matches the tuple (type, uid, ptr).  If one cannot be found then one is  */
7644 /* allocated.  If one is found then it is moved to the top of the list of   */
7645 /* currently active tokens.                                                 */
7646 /* ------------------------------------------------------------------------ */
7647 ipftoken_t *
7648 ipf_token_find(softc, type, uid, ptr)
7649         ipf_main_softc_t *softc;
7650         int type, uid;
7651         void *ptr;
7652 {
7653         ipftoken_t *it, *new;
7654
7655         KMALLOC(new, ipftoken_t *);
7656         if (new != NULL)
7657                 bzero((char *)new, sizeof(*new));
7658
7659         WRITE_ENTER(&softc->ipf_tokens);
7660         for (it = softc->ipf_token_head; it != NULL; it = it->ipt_next) {
7661                 if ((ptr == it->ipt_ctx) && (type == it->ipt_type) &&
7662                     (uid == it->ipt_uid) && (it->ipt_complete < 2))
7663                         break;
7664         }
7665
7666         if (it == NULL) {
7667                 it = new;
7668                 new = NULL;
7669                 if (it == NULL) {
7670                         RWLOCK_EXIT(&softc->ipf_tokens);
7671                         return NULL;
7672                 }
7673                 it->ipt_ctx = ptr;
7674                 it->ipt_uid = uid;
7675                 it->ipt_type = type;
7676                 it->ipt_ref = 1;
7677         } else {
7678                 if (new != NULL) {
7679                         KFREE(new);
7680                         new = NULL;
7681                 }
7682
7683                 if (it->ipt_complete > 0)
7684                         it = NULL;
7685                 else
7686                         ipf_token_unlink(softc, it);
7687         }
7688
7689         if (it != NULL) {
7690                 it->ipt_pnext = softc->ipf_token_tail;
7691                 *softc->ipf_token_tail = it;
7692                 softc->ipf_token_tail = &it->ipt_next;
7693                 it->ipt_next = NULL;
7694                 it->ipt_ref++;
7695
7696                 it->ipt_die = softc->ipf_ticks + 20;
7697         }
7698
7699         RWLOCK_EXIT(&softc->ipf_tokens);
7700
7701         return it;
7702 }
7703
7704
7705 /* ------------------------------------------------------------------------ */
7706 /* Function:    ipf_token_unlink                                            */
7707 /* Returns:     None.                                                       */
7708 /* Parameters:  softc(I) - pointer to soft context main structure           */
7709 /*              token(I) - pointer to token structure                       */
7710 /* Write Locks: ipf_tokens                                                  */
7711 /*                                                                          */
7712 /* This function unlinks a token structure from the linked list of tokens   */
7713 /* that "own" it.  The head pointer never needs to be explicitly adjusted   */
7714 /* but the tail does due to the linked list implementation.                 */
7715 /* ------------------------------------------------------------------------ */
7716 static void
7717 ipf_token_unlink(softc, token)
7718         ipf_main_softc_t *softc;
7719         ipftoken_t *token;
7720 {
7721
7722         if (softc->ipf_token_tail == &token->ipt_next)
7723                 softc->ipf_token_tail = token->ipt_pnext;
7724
7725         *token->ipt_pnext = token->ipt_next;
7726         if (token->ipt_next != NULL)
7727                 token->ipt_next->ipt_pnext = token->ipt_pnext;
7728         token->ipt_next = NULL;
7729         token->ipt_pnext = NULL;
7730 }
7731
7732
7733 /* ------------------------------------------------------------------------ */
7734 /* Function:    ipf_token_deref                                             */
7735 /* Returns:     int      - 0 == token freed, else reference count           */
7736 /* Parameters:  softc(I) - pointer to soft context main structure           */
7737 /*              token(I) - pointer to token structure                       */
7738 /* Write Locks: ipf_tokens                                                  */
7739 /*                                                                          */
7740 /* Drop the reference count on the token structure and if it drops to zero, */
7741 /* call the dereference function for the token type because it is then      */
7742 /* possible to free the token data structure.                               */
7743 /* ------------------------------------------------------------------------ */
7744 int
7745 ipf_token_deref(softc, token)
7746         ipf_main_softc_t *softc;
7747         ipftoken_t *token;
7748 {
7749         void *data, **datap;
7750
7751         ASSERT(token->ipt_ref > 0);
7752         token->ipt_ref--;
7753         if (token->ipt_ref > 0)
7754                 return token->ipt_ref;
7755
7756         data = token->ipt_data;
7757         datap = &data;
7758
7759         if ((data != NULL) && (data != (void *)-1)) {
7760                 switch (token->ipt_type)
7761                 {
7762                 case IPFGENITER_IPF :
7763                         (void) ipf_derefrule(softc, (frentry_t **)datap);
7764                         break;
7765                 case IPFGENITER_IPNAT :
7766                         WRITE_ENTER(&softc->ipf_nat);
7767                         ipf_nat_rule_deref(softc, (ipnat_t **)datap);
7768                         RWLOCK_EXIT(&softc->ipf_nat);
7769                         break;
7770                 case IPFGENITER_NAT :
7771                         ipf_nat_deref(softc, (nat_t **)datap);
7772                         break;
7773                 case IPFGENITER_STATE :
7774                         ipf_state_deref(softc, (ipstate_t **)datap);
7775                         break;
7776                 case IPFGENITER_FRAG :
7777                         ipf_frag_pkt_deref(softc, (ipfr_t **)datap);
7778                         break;
7779                 case IPFGENITER_NATFRAG :
7780                         ipf_frag_nat_deref(softc, (ipfr_t **)datap);
7781                         break;
7782                 case IPFGENITER_HOSTMAP :
7783                         WRITE_ENTER(&softc->ipf_nat);
7784                         ipf_nat_hostmapdel(softc, (hostmap_t **)datap);
7785                         RWLOCK_EXIT(&softc->ipf_nat);
7786                         break;
7787                 default :
7788                         ipf_lookup_iterderef(softc, token->ipt_type, data);
7789                         break;
7790                 }
7791         }
7792
7793         ipf_token_unlink(softc, token);
7794         KFREE(token);
7795         return 0;
7796 }
7797
7798
7799 /* ------------------------------------------------------------------------ */
7800 /* Function:    ipf_nextrule                                                */
7801 /* Returns:     frentry_t * - NULL == no more rules, else pointer to next   */
7802 /* Parameters:  softc(I)    - pointer to soft context main structure        */
7803 /*              fr(I)       - pointer to filter rule                        */
7804 /*              out(I)      - 1 == out rules, 0 == input rules              */
7805 /*                                                                          */
7806 /* Starting with "fr", find the next rule to visit. This includes visiting  */
7807 /* the list of rule groups if either fr is NULL (empty list) or it is the   */
7808 /* last rule in the list. When walking rule lists, it is either input or    */
7809 /* output rules that are returned, never both.                              */
7810 /* ------------------------------------------------------------------------ */
7811 static frentry_t *
7812 ipf_nextrule(softc, active, unit, fr, out)
7813         ipf_main_softc_t *softc;
7814         int active, unit;
7815         frentry_t *fr;
7816         int out;
7817 {
7818         frentry_t *next;
7819         frgroup_t *fg;
7820
7821         if (fr != NULL && fr->fr_group != -1) {
7822                 fg = ipf_findgroup(softc, fr->fr_names + fr->fr_group,
7823                                    unit, active, NULL);
7824                 if (fg != NULL)
7825                         fg = fg->fg_next;
7826         } else {
7827                 fg = softc->ipf_groups[unit][active];
7828         }
7829
7830         while (fg != NULL) {
7831                 next = fg->fg_start;
7832                 while (next != NULL) {
7833                         if (out) {
7834                                 if (next->fr_flags & FR_OUTQUE)
7835                                         return next;
7836                         } else if (next->fr_flags & FR_INQUE) {
7837                                 return next;
7838                         }
7839                         next = next->fr_next;
7840                 }
7841                 if (next == NULL)
7842                         fg = fg->fg_next;
7843         }
7844
7845         return NULL;
7846 }
7847
7848 /* ------------------------------------------------------------------------ */
7849 /* Function:    ipf_getnextrule                                             */
7850 /* Returns:     int - 0 = success, else error                               */
7851 /* Parameters:  softc(I)- pointer to soft context main structure            */
7852 /*              t(I)   - pointer to destination information to resolve      */
7853 /*              ptr(I) - pointer to ipfobj_t to copyin from user space      */
7854 /*                                                                          */
7855 /* This function's first job is to bring in the ipfruleiter_t structure via */
7856 /* the ipfobj_t structure to determine what should be the next rule to      */
7857 /* return. Once the ipfruleiter_t has been brought in, it then tries to     */
7858 /* find the 'next rule'.  This may include searching rule group lists or    */
7859 /* just be as simple as looking at the 'next' field in the rule structure.  */
7860 /* When we have found the rule to return, increase its reference count and  */
7861 /* if we used an existing rule to get here, decrease its reference count.   */
7862 /* ------------------------------------------------------------------------ */
7863 int
7864 ipf_getnextrule(softc, t, ptr)
7865         ipf_main_softc_t *softc;
7866         ipftoken_t *t;
7867         void *ptr;
7868 {
7869         frentry_t *fr, *next, zero;
7870         ipfruleiter_t it;
7871         int error, out;
7872         frgroup_t *fg;
7873         ipfobj_t obj;
7874         int predict;
7875         char *dst;
7876         int unit;
7877
7878         if (t == NULL || ptr == NULL) {
7879                 IPFERROR(84);
7880                 return EFAULT;
7881         }
7882
7883         error = ipf_inobj(softc, ptr, &obj, &it, IPFOBJ_IPFITER);
7884         if (error != 0)
7885                 return error;
7886
7887         if ((it.iri_inout < 0) || (it.iri_inout > 3)) {
7888                 IPFERROR(85);
7889                 return EINVAL;
7890         }
7891         if ((it.iri_active != 0) && (it.iri_active != 1)) {
7892                 IPFERROR(86);
7893                 return EINVAL;
7894         }
7895         if (it.iri_nrules == 0) {
7896                 IPFERROR(87);
7897                 return ENOSPC;
7898         }
7899         if (it.iri_rule == NULL) {
7900                 IPFERROR(88);
7901                 return EFAULT;
7902         }
7903
7904         fg = NULL;
7905         fr = t->ipt_data;
7906         if ((it.iri_inout & F_OUT) != 0)
7907                 out = 1;
7908         else
7909                 out = 0;
7910         if ((it.iri_inout & F_ACIN) != 0)
7911                 unit = IPL_LOGCOUNT;
7912         else
7913                 unit = IPL_LOGIPF;
7914
7915         READ_ENTER(&softc->ipf_mutex);
7916         if (fr == NULL) {
7917                 if (*it.iri_group == '\0') {
7918                         if (unit == IPL_LOGCOUNT) {
7919                                 next = softc->ipf_acct[out][it.iri_active];
7920                         } else {
7921                                 next = softc->ipf_rules[out][it.iri_active];
7922                         }
7923                         if (next == NULL)
7924                                 next = ipf_nextrule(softc, it.iri_active,
7925                                                     unit, NULL, out);
7926                 } else {
7927                         fg = ipf_findgroup(softc, it.iri_group, unit,
7928                                            it.iri_active, NULL);
7929                         if (fg != NULL)
7930                                 next = fg->fg_start;
7931                         else
7932                                 next = NULL;
7933                 }
7934         } else {
7935                 next = fr->fr_next;
7936                 if (next == NULL)
7937                         next = ipf_nextrule(softc, it.iri_active, unit,
7938                                             fr, out);
7939         }
7940
7941         if (next != NULL && next->fr_next != NULL)
7942                 predict = 1;
7943         else if (ipf_nextrule(softc, it.iri_active, unit, next, out) != NULL)
7944                 predict = 1;
7945         else
7946                 predict = 0;
7947
7948         if (fr != NULL)
7949                 (void) ipf_derefrule(softc, &fr);
7950
7951         obj.ipfo_type = IPFOBJ_FRENTRY;
7952         dst = (char *)it.iri_rule;
7953
7954         if (next != NULL) {
7955                 obj.ipfo_size = next->fr_size;
7956                 MUTEX_ENTER(&next->fr_lock);
7957                 next->fr_ref++;
7958                 MUTEX_EXIT(&next->fr_lock);
7959                 t->ipt_data = next;
7960         } else {
7961                 obj.ipfo_size = sizeof(frentry_t);
7962                 bzero(&zero, sizeof(zero));
7963                 next = &zero;
7964                 t->ipt_data = NULL;
7965         }
7966         it.iri_rule = predict ? next : NULL;
7967         if (predict == 0)
7968                 ipf_token_mark_complete(t);
7969
7970         RWLOCK_EXIT(&softc->ipf_mutex);
7971
7972         obj.ipfo_ptr = dst;
7973         error = ipf_outobjk(softc, &obj, next);
7974         if (error == 0 && t->ipt_data != NULL) {
7975                 dst += obj.ipfo_size;
7976                 if (next->fr_data != NULL) {
7977                         ipfobj_t dobj;
7978
7979                         if (next->fr_type == FR_T_IPFEXPR)
7980                                 dobj.ipfo_type = IPFOBJ_IPFEXPR;
7981                         else
7982                                 dobj.ipfo_type = IPFOBJ_FRIPF;
7983                         dobj.ipfo_size = next->fr_dsize;
7984                         dobj.ipfo_rev = obj.ipfo_rev;
7985                         dobj.ipfo_ptr = dst;
7986                         error = ipf_outobjk(softc, &dobj, next->fr_data);
7987                 }
7988         }
7989
7990         if ((fr != NULL) && (next == &zero))
7991                 (void) ipf_derefrule(softc, &fr);
7992
7993         return error;
7994 }
7995
7996
7997 /* ------------------------------------------------------------------------ */
7998 /* Function:    ipf_frruleiter                                              */
7999 /* Returns:     int - 0 = success, else error                               */
8000 /* Parameters:  softc(I)- pointer to soft context main structure            */
8001 /*              data(I) - the token type to match                           */
8002 /*              uid(I)  - uid owning the token                              */
8003 /*              ptr(I)  - context pointer for the token                     */
8004 /*                                                                          */
8005 /* This function serves as a stepping stone between ipf_ipf_ioctl and       */
8006 /* ipf_getnextrule.  It's role is to find the right token in the kernel for */
8007 /* the process doing the ioctl and use that to ask for the next rule.       */
8008 /* ------------------------------------------------------------------------ */
8009 static int
8010 ipf_frruleiter(softc, data, uid, ctx)
8011         ipf_main_softc_t *softc;
8012         void *data, *ctx;
8013         int uid;
8014 {
8015         ipftoken_t *token;
8016         ipfruleiter_t it;
8017         ipfobj_t obj;
8018         int error;
8019
8020         token = ipf_token_find(softc, IPFGENITER_IPF, uid, ctx);
8021         if (token != NULL) {
8022                 error = ipf_getnextrule(softc, token, data);
8023                 WRITE_ENTER(&softc->ipf_tokens);
8024                 ipf_token_deref(softc, token);
8025                 RWLOCK_EXIT(&softc->ipf_tokens);
8026         } else {
8027                 error = ipf_inobj(softc, data, &obj, &it, IPFOBJ_IPFITER);
8028                 if (error != 0)
8029                         return error;
8030                 it.iri_rule = NULL;
8031                 error = ipf_outobj(softc, data, &it, IPFOBJ_IPFITER);
8032         }
8033
8034         return error;
8035 }
8036
8037
8038 /* ------------------------------------------------------------------------ */
8039 /* Function:    ipf_geniter                                                 */
8040 /* Returns:     int - 0 = success, else error                               */
8041 /* Parameters:  softc(I) - pointer to soft context main structure           */
8042 /*              token(I) - pointer to ipftoken_t structure                  */
8043 /*              itp(I)   - pointer to iterator data                         */
8044 /*                                                                          */
8045 /* Decide which iterator function to call using information passed through  */
8046 /* the ipfgeniter_t structure at itp.                                       */
8047 /* ------------------------------------------------------------------------ */
8048 static int
8049 ipf_geniter(softc, token, itp)
8050         ipf_main_softc_t *softc;
8051         ipftoken_t *token;
8052         ipfgeniter_t *itp;
8053 {
8054         int error;
8055
8056         switch (itp->igi_type)
8057         {
8058         case IPFGENITER_FRAG :
8059                 error = ipf_frag_pkt_next(softc, token, itp);
8060                 break;
8061         default :
8062                 IPFERROR(92);
8063                 error = EINVAL;
8064                 break;
8065         }
8066
8067         return error;
8068 }
8069
8070
8071 /* ------------------------------------------------------------------------ */
8072 /* Function:    ipf_genericiter                                             */
8073 /* Returns:     int - 0 = success, else error                               */
8074 /* Parameters:  softc(I)- pointer to soft context main structure            */
8075 /*              data(I) - the token type to match                           */
8076 /*              uid(I)  - uid owning the token                              */
8077 /*              ptr(I)  - context pointer for the token                     */
8078 /*                                                                          */
8079 /* Handle the SIOCGENITER ioctl for the ipfilter device. The primary role   */
8080 /* ------------------------------------------------------------------------ */
8081 int
8082 ipf_genericiter(softc, data, uid, ctx)
8083         ipf_main_softc_t *softc;
8084         void *data, *ctx;
8085         int uid;
8086 {
8087         ipftoken_t *token;
8088         ipfgeniter_t iter;
8089         int error;
8090
8091         error = ipf_inobj(softc, data, NULL, &iter, IPFOBJ_GENITER);
8092         if (error != 0)
8093                 return error;
8094
8095         token = ipf_token_find(softc, iter.igi_type, uid, ctx);
8096         if (token != NULL) {
8097                 token->ipt_subtype = iter.igi_type;
8098                 error = ipf_geniter(softc, token, &iter);
8099                 WRITE_ENTER(&softc->ipf_tokens);
8100                 ipf_token_deref(softc, token);
8101                 RWLOCK_EXIT(&softc->ipf_tokens);
8102         } else {
8103                 IPFERROR(93);
8104                 error = 0;
8105         }
8106
8107         return error;
8108 }
8109
8110
8111 /* ------------------------------------------------------------------------ */
8112 /* Function:    ipf_ipf_ioctl                                               */
8113 /* Returns:     int - 0 = success, else error                               */
8114 /* Parameters:  softc(I)- pointer to soft context main structure           */
8115 /*              data(I) - the token type to match                           */
8116 /*              cmd(I)  - the ioctl command number                          */
8117 /*              mode(I) - mode flags for the ioctl                          */
8118 /*              uid(I)  - uid owning the token                              */
8119 /*              ptr(I)  - context pointer for the token                     */
8120 /*                                                                          */
8121 /* This function handles all of the ioctl command that are actually isssued */
8122 /* to the /dev/ipl device.                                                  */
8123 /* ------------------------------------------------------------------------ */
8124 int
8125 ipf_ipf_ioctl(softc, data, cmd, mode, uid, ctx)
8126         ipf_main_softc_t *softc;
8127         caddr_t data;
8128         ioctlcmd_t cmd;
8129         int mode, uid;
8130         void *ctx;
8131 {
8132         friostat_t fio;
8133         int error, tmp;
8134         ipfobj_t obj;
8135         SPL_INT(s);
8136
8137         switch (cmd)
8138         {
8139         case SIOCFRENB :
8140                 if (!(mode & FWRITE)) {
8141                         IPFERROR(94);
8142                         error = EPERM;
8143                 } else {
8144                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8145                         if (error != 0) {
8146                                 IPFERROR(95);
8147                                 error = EFAULT;
8148                                 break;
8149                         }
8150
8151                         WRITE_ENTER(&softc->ipf_global);
8152                         if (tmp) {
8153                                 if (softc->ipf_running > 0)
8154                                         error = 0;
8155                                 else
8156                                         error = ipfattach(softc);
8157                                 if (error == 0)
8158                                         softc->ipf_running = 1;
8159                                 else
8160                                         (void) ipfdetach(softc);
8161                         } else {
8162                                 if (softc->ipf_running == 1)
8163                                         error = ipfdetach(softc);
8164                                 else
8165                                         error = 0;
8166                                 if (error == 0)
8167                                         softc->ipf_running = -1;
8168                         }
8169                         RWLOCK_EXIT(&softc->ipf_global);
8170                 }
8171                 break;
8172
8173         case SIOCIPFSET :
8174                 if (!(mode & FWRITE)) {
8175                         IPFERROR(96);
8176                         error = EPERM;
8177                         break;
8178                 }
8179                 /* FALLTHRU */
8180         case SIOCIPFGETNEXT :
8181         case SIOCIPFGET :
8182                 error = ipf_ipftune(softc, cmd, (void *)data);
8183                 break;
8184
8185         case SIOCSETFF :
8186                 if (!(mode & FWRITE)) {
8187                         IPFERROR(97);
8188                         error = EPERM;
8189                 } else {
8190                         error = BCOPYIN(data, &softc->ipf_flags,
8191                                         sizeof(softc->ipf_flags));
8192                         if (error != 0) {
8193                                 IPFERROR(98);
8194                                 error = EFAULT;
8195                         }
8196                 }
8197                 break;
8198
8199         case SIOCGETFF :
8200                 error = BCOPYOUT(&softc->ipf_flags, data,
8201                                  sizeof(softc->ipf_flags));
8202                 if (error != 0) {
8203                         IPFERROR(99);
8204                         error = EFAULT;
8205                 }
8206                 break;
8207
8208         case SIOCFUNCL :
8209                 error = ipf_resolvefunc(softc, (void *)data);
8210                 break;
8211
8212         case SIOCINAFR :
8213         case SIOCRMAFR :
8214         case SIOCADAFR :
8215         case SIOCZRLST :
8216                 if (!(mode & FWRITE)) {
8217                         IPFERROR(100);
8218                         error = EPERM;
8219                 } else {
8220                         error = frrequest(softc, IPL_LOGIPF, cmd, (caddr_t)data,
8221                                           softc->ipf_active, 1);
8222                 }
8223                 break;
8224
8225         case SIOCINIFR :
8226         case SIOCRMIFR :
8227         case SIOCADIFR :
8228                 if (!(mode & FWRITE)) {
8229                         IPFERROR(101);
8230                         error = EPERM;
8231                 } else {
8232                         error = frrequest(softc, IPL_LOGIPF, cmd, (caddr_t)data,
8233                                           1 - softc->ipf_active, 1);
8234                 }
8235                 break;
8236
8237         case SIOCSWAPA :
8238                 if (!(mode & FWRITE)) {
8239                         IPFERROR(102);
8240                         error = EPERM;
8241                 } else {
8242                         WRITE_ENTER(&softc->ipf_mutex);
8243                         error = BCOPYOUT(&softc->ipf_active, data,
8244                                          sizeof(softc->ipf_active));
8245                         if (error != 0) {
8246                                 IPFERROR(103);
8247                                 error = EFAULT;
8248                         } else {
8249                                 softc->ipf_active = 1 - softc->ipf_active;
8250                         }
8251                         RWLOCK_EXIT(&softc->ipf_mutex);
8252                 }
8253                 break;
8254
8255         case SIOCGETFS :
8256                 error = ipf_inobj(softc, (void *)data, &obj, &fio,
8257                                   IPFOBJ_IPFSTAT);
8258                 if (error != 0)
8259                         break;
8260                 ipf_getstat(softc, &fio, obj.ipfo_rev);
8261                 error = ipf_outobj(softc, (void *)data, &fio, IPFOBJ_IPFSTAT);
8262                 break;
8263
8264         case SIOCFRZST :
8265                 if (!(mode & FWRITE)) {
8266                         IPFERROR(104);
8267                         error = EPERM;
8268                 } else
8269                         error = ipf_zerostats(softc, (caddr_t)data);
8270                 break;
8271
8272         case SIOCIPFFL :
8273                 if (!(mode & FWRITE)) {
8274                         IPFERROR(105);
8275                         error = EPERM;
8276                 } else {
8277                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8278                         if (!error) {
8279                                 tmp = ipf_flush(softc, IPL_LOGIPF, tmp);
8280                                 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8281                                 if (error != 0) {
8282                                         IPFERROR(106);
8283                                         error = EFAULT;
8284                                 }
8285                         } else {
8286                                 IPFERROR(107);
8287                                 error = EFAULT;
8288                         }
8289                 }
8290                 break;
8291
8292 #ifdef USE_INET6
8293         case SIOCIPFL6 :
8294                 if (!(mode & FWRITE)) {
8295                         IPFERROR(108);
8296                         error = EPERM;
8297                 } else {
8298                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8299                         if (!error) {
8300                                 tmp = ipf_flush(softc, IPL_LOGIPF, tmp);
8301                                 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8302                                 if (error != 0) {
8303                                         IPFERROR(109);
8304                                         error = EFAULT;
8305                                 }
8306                         } else {
8307                                 IPFERROR(110);
8308                                 error = EFAULT;
8309                         }
8310                 }
8311                 break;
8312 #endif
8313
8314         case SIOCSTLCK :
8315                 if (!(mode & FWRITE)) {
8316                         IPFERROR(122);
8317                         error = EPERM;
8318                 } else {
8319                         error = BCOPYIN(data, &tmp, sizeof(tmp));
8320                         if (error == 0) {
8321                                 ipf_state_setlock(softc->ipf_state_soft, tmp);
8322                                 ipf_nat_setlock(softc->ipf_nat_soft, tmp);
8323                                 ipf_frag_setlock(softc->ipf_frag_soft, tmp);
8324                                 ipf_auth_setlock(softc->ipf_auth_soft, tmp);
8325                         } else {
8326                                 IPFERROR(111);
8327                                 error = EFAULT;
8328                         }
8329                 }
8330                 break;
8331
8332 #ifdef  IPFILTER_LOG
8333         case SIOCIPFFB :
8334                 if (!(mode & FWRITE)) {
8335                         IPFERROR(112);
8336                         error = EPERM;
8337                 } else {
8338                         tmp = ipf_log_clear(softc, IPL_LOGIPF);
8339                         error = BCOPYOUT(&tmp, data, sizeof(tmp));
8340                         if (error) {
8341                                 IPFERROR(113);
8342                                 error = EFAULT;
8343                         }
8344                 }
8345                 break;
8346 #endif /* IPFILTER_LOG */
8347
8348         case SIOCFRSYN :
8349                 if (!(mode & FWRITE)) {
8350                         IPFERROR(114);
8351                         error = EPERM;
8352                 } else {
8353                         WRITE_ENTER(&softc->ipf_global);
8354 #if (defined(MENTAT) && defined(_KERNEL)) && !defined(INSTANCES)
8355                         error = ipfsync();
8356 #else
8357                         ipf_sync(softc, NULL);
8358                         error = 0;
8359 #endif
8360                         RWLOCK_EXIT(&softc->ipf_global);
8361
8362                 }
8363                 break;
8364
8365         case SIOCGFRST :
8366                 error = ipf_outobj(softc, (void *)data,
8367                                    ipf_frag_stats(softc->ipf_frag_soft),
8368                                    IPFOBJ_FRAGSTAT);
8369                 break;
8370
8371 #ifdef  IPFILTER_LOG
8372         case FIONREAD :
8373                 tmp = ipf_log_bytesused(softc, IPL_LOGIPF);
8374                 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8375                 break;
8376 #endif
8377
8378         case SIOCIPFITER :
8379                 SPL_SCHED(s);
8380                 error = ipf_frruleiter(softc, data, uid, ctx);
8381                 SPL_X(s);
8382                 break;
8383
8384         case SIOCGENITER :
8385                 SPL_SCHED(s);
8386                 error = ipf_genericiter(softc, data, uid, ctx);
8387                 SPL_X(s);
8388                 break;
8389
8390         case SIOCIPFDELTOK :
8391                 error = BCOPYIN(data, &tmp, sizeof(tmp));
8392                 if (error == 0) {
8393                         SPL_SCHED(s);
8394                         error = ipf_token_del(softc, tmp, uid, ctx);
8395                         SPL_X(s);
8396                 }
8397                 break;
8398
8399         default :
8400                 IPFERROR(115);
8401                 error = EINVAL;
8402                 break;
8403         }
8404
8405         return error;
8406 }
8407
8408
8409 /* ------------------------------------------------------------------------ */
8410 /* Function:    ipf_decaps                                                  */
8411 /* Returns:     int        - -1 == decapsulation failed, else bit mask of   */
8412 /*                           flags indicating packet filtering decision.    */
8413 /* Parameters:  fin(I)     - pointer to packet information                  */
8414 /*              pass(I)    - IP protocol version to match                   */
8415 /*              l5proto(I) - layer 5 protocol to decode UDP data as.        */
8416 /*                                                                          */
8417 /* This function is called for packets that are wrapt up in other packets,  */
8418 /* for example, an IP packet that is the entire data segment for another IP */
8419 /* packet.  If the basic constraints for this are satisfied, change the     */
8420 /* buffer to point to the start of the inner packet and start processing    */
8421 /* rules belonging to the head group this rule specifies.                   */
8422 /* ------------------------------------------------------------------------ */
8423 u_32_t
8424 ipf_decaps(fin, pass, l5proto)
8425         fr_info_t *fin;
8426         u_32_t pass;
8427         int l5proto;
8428 {
8429         fr_info_t fin2, *fino = NULL;
8430         int elen, hlen, nh;
8431         grehdr_t gre;
8432         ip_t *ip;
8433         mb_t *m;
8434
8435         if ((fin->fin_flx & FI_COALESCE) == 0)
8436                 if (ipf_coalesce(fin) == -1)
8437                         goto cantdecaps;
8438
8439         m = fin->fin_m;
8440         hlen = fin->fin_hlen;
8441
8442         switch (fin->fin_p)
8443         {
8444         case IPPROTO_UDP :
8445                 /*
8446                  * In this case, the specific protocol being decapsulated
8447                  * inside UDP frames comes from the rule.
8448                  */
8449                 nh = fin->fin_fr->fr_icode;
8450                 break;
8451
8452         case IPPROTO_GRE :      /* 47 */
8453                 bcopy(fin->fin_dp, (char *)&gre, sizeof(gre));
8454                 hlen += sizeof(grehdr_t);
8455                 if (gre.gr_R|gre.gr_s)
8456                         goto cantdecaps;
8457                 if (gre.gr_C)
8458                         hlen += 4;
8459                 if (gre.gr_K)
8460                         hlen += 4;
8461                 if (gre.gr_S)
8462                         hlen += 4;
8463
8464                 nh = IPPROTO_IP;
8465
8466                 /*
8467                  * If the routing options flag is set, validate that it is
8468                  * there and bounce over it.
8469                  */
8470 #if 0
8471                 /* This is really heavy weight and lots of room for error, */
8472                 /* so for now, put it off and get the simple stuff right.  */
8473                 if (gre.gr_R) {
8474                         u_char off, len, *s;
8475                         u_short af;
8476                         int end;
8477
8478                         end = 0;
8479                         s = fin->fin_dp;
8480                         s += hlen;
8481                         aplen = fin->fin_plen - hlen;
8482                         while (aplen > 3) {
8483                                 af = (s[0] << 8) | s[1];
8484                                 off = s[2];
8485                                 len = s[3];
8486                                 aplen -= 4;
8487                                 s += 4;
8488                                 if (af == 0 && len == 0) {
8489                                         end = 1;
8490                                         break;
8491                                 }
8492                                 if (aplen < len)
8493                                         break;
8494                                 s += len;
8495                                 aplen -= len;
8496                         }
8497                         if (end != 1)
8498                                 goto cantdecaps;
8499                         hlen = s - (u_char *)fin->fin_dp;
8500                 }
8501 #endif
8502                 break;
8503
8504 #ifdef IPPROTO_IPIP
8505         case IPPROTO_IPIP :     /* 4 */
8506 #endif
8507                 nh = IPPROTO_IP;
8508                 break;
8509
8510         default :       /* Includes ESP, AH is special for IPv4 */
8511                 goto cantdecaps;
8512         }
8513
8514         switch (nh)
8515         {
8516         case IPPROTO_IP :
8517         case IPPROTO_IPV6 :
8518                 break;
8519         default :
8520                 goto cantdecaps;
8521         }
8522
8523         bcopy((char *)fin, (char *)&fin2, sizeof(fin2));
8524         fino = fin;
8525         fin = &fin2;
8526         elen = hlen;
8527 #if defined(MENTAT) && defined(_KERNEL)
8528         m->b_rptr += elen;
8529 #else
8530         m->m_data += elen;
8531         m->m_len -= elen;
8532 #endif
8533         fin->fin_plen -= elen;
8534
8535         ip = (ip_t *)((char *)fin->fin_ip + elen);
8536
8537         /*
8538          * Make sure we have at least enough data for the network layer
8539          * header.
8540          */
8541         if (IP_V(ip) == 4)
8542                 hlen = IP_HL(ip) << 2;
8543 #ifdef USE_INET6
8544         else if (IP_V(ip) == 6)
8545                 hlen = sizeof(ip6_t);
8546 #endif
8547         else
8548                 goto cantdecaps2;
8549
8550         if (fin->fin_plen < hlen)
8551                 goto cantdecaps2;
8552
8553         fin->fin_dp = (char *)ip + hlen;
8554
8555         if (IP_V(ip) == 4) {
8556                 /*
8557                  * Perform IPv4 header checksum validation.
8558                  */
8559                 if (ipf_cksum((u_short *)ip, hlen))
8560                         goto cantdecaps2;
8561         }
8562
8563         if (ipf_makefrip(hlen, ip, fin) == -1) {
8564 cantdecaps2:
8565                 if (m != NULL) {
8566 #if defined(MENTAT) && defined(_KERNEL)
8567                         m->b_rptr -= elen;
8568 #else
8569                         m->m_data -= elen;
8570                         m->m_len += elen;
8571 #endif
8572                 }
8573 cantdecaps:
8574                 DT1(frb_decapfrip, fr_info_t *, fin);
8575                 pass &= ~FR_CMDMASK;
8576                 pass |= FR_BLOCK|FR_QUICK;
8577                 fin->fin_reason = FRB_DECAPFRIP;
8578                 return -1;
8579         }
8580
8581         pass = ipf_scanlist(fin, pass);
8582
8583         /*
8584          * Copy the packet filter "result" fields out of the fr_info_t struct
8585          * that is local to the decapsulation processing and back into the
8586          * one we were called with.
8587          */
8588         fino->fin_flx = fin->fin_flx;
8589         fino->fin_rev = fin->fin_rev;
8590         fino->fin_icode = fin->fin_icode;
8591         fino->fin_rule = fin->fin_rule;
8592         (void) strncpy(fino->fin_group, fin->fin_group, FR_GROUPLEN);
8593         fino->fin_fr = fin->fin_fr;
8594         fino->fin_error = fin->fin_error;
8595         fino->fin_mp = fin->fin_mp;
8596         fino->fin_m = fin->fin_m;
8597         m = fin->fin_m;
8598         if (m != NULL) {
8599 #if defined(MENTAT) && defined(_KERNEL)
8600                 m->b_rptr -= elen;
8601 #else
8602                 m->m_data -= elen;
8603                 m->m_len += elen;
8604 #endif
8605         }
8606         return pass;
8607 }
8608
8609
8610 /* ------------------------------------------------------------------------ */
8611 /* Function:    ipf_matcharray_load                                         */
8612 /* Returns:     int         - 0 = success, else error                       */
8613 /* Parameters:  softc(I)    - pointer to soft context main structure        */
8614 /*              data(I)     - pointer to ioctl data                         */
8615 /*              objp(I)     - ipfobj_t structure to load data into          */
8616 /*              arrayptr(I) - pointer to location to store array pointer    */
8617 /*                                                                          */
8618 /* This function loads in a mathing array through the ipfobj_t struct that  */
8619 /* describes it.  Sanity checking and array size limitations are enforced   */
8620 /* in this function to prevent userspace from trying to load in something   */
8621 /* that is insanely big.  Once the size of the array is known, the memory   */
8622 /* required is malloc'd and returned through changing *arrayptr.  The       */
8623 /* contents of the array are verified before returning.  Only in the event  */
8624 /* of a successful call is the caller required to free up the malloc area.  */
8625 /* ------------------------------------------------------------------------ */
8626 int
8627 ipf_matcharray_load(softc, data, objp, arrayptr)
8628         ipf_main_softc_t *softc;
8629         caddr_t data;
8630         ipfobj_t *objp;
8631         int **arrayptr;
8632 {
8633         int arraysize, *array, error;
8634
8635         *arrayptr = NULL;
8636
8637         error = BCOPYIN(data, objp, sizeof(*objp));
8638         if (error != 0) {
8639                 IPFERROR(116);
8640                 return EFAULT;
8641         }
8642
8643         if (objp->ipfo_type != IPFOBJ_IPFEXPR) {
8644                 IPFERROR(117);
8645                 return EINVAL;
8646         }
8647
8648         if (((objp->ipfo_size & 3) != 0) || (objp->ipfo_size == 0) ||
8649             (objp->ipfo_size > 1024)) {
8650                 IPFERROR(118);
8651                 return EINVAL;
8652         }
8653
8654         arraysize = objp->ipfo_size * sizeof(*array);
8655         KMALLOCS(array, int *, arraysize);
8656         if (array == NULL) {
8657                 IPFERROR(119);
8658                 return ENOMEM;
8659         }
8660
8661         error = COPYIN(objp->ipfo_ptr, array, arraysize);
8662         if (error != 0) {
8663                 KFREES(array, arraysize);
8664                 IPFERROR(120);
8665                 return EFAULT;
8666         }
8667
8668         if (ipf_matcharray_verify(array, arraysize) != 0) {
8669                 KFREES(array, arraysize);
8670                 IPFERROR(121);
8671                 return EINVAL;
8672         }
8673
8674         *arrayptr = array;
8675         return 0;
8676 }
8677
8678
8679 /* ------------------------------------------------------------------------ */
8680 /* Function:    ipf_matcharray_verify                                       */
8681 /* Returns:     Nil                                                         */
8682 /* Parameters:  array(I)     - pointer to matching array                    */
8683 /*              arraysize(I) - number of elements in the array              */
8684 /*                                                                          */
8685 /* Verify the contents of a matching array by stepping through each element */
8686 /* in it.  The actual commands in the array are not verified for            */
8687 /* correctness, only that all of the sizes are correctly within limits.     */
8688 /* ------------------------------------------------------------------------ */
8689 int
8690 ipf_matcharray_verify(array, arraysize)
8691         int *array, arraysize;
8692 {
8693         int i, nelem, maxidx;
8694         ipfexp_t *e;
8695
8696         nelem = arraysize / sizeof(*array);
8697
8698         /*
8699          * Currently, it makes no sense to have an array less than 6
8700          * elements long - the initial size at the from, a single operation
8701          * (minimum 4 in length) and a trailer, for a total of 6.
8702          */
8703         if ((array[0] < 6) || (arraysize < 24) || (arraysize > 4096)) {
8704                 return -1;
8705         }
8706
8707         /*
8708          * Verify the size of data pointed to by array with how long
8709          * the array claims to be itself.
8710          */
8711         if (array[0] * sizeof(*array) != arraysize) {
8712                 return -1;
8713         }
8714
8715         maxidx = nelem - 1;
8716         /*
8717          * The last opcode in this array should be an IPF_EXP_END.
8718          */
8719         if (array[maxidx] != IPF_EXP_END) {
8720                 return -1;
8721         }
8722
8723         for (i = 1; i < maxidx; ) {
8724                 e = (ipfexp_t *)(array + i);
8725
8726                 /*
8727                  * The length of the bits to check must be at least 1
8728                  * (or else there is nothing to comapre with!) and it
8729                  * cannot exceed the length of the data present.
8730                  */
8731                 if ((e->ipfe_size < 1 ) ||
8732                     (e->ipfe_size + i > maxidx)) {
8733                         return -1;
8734                 }
8735                 i += e->ipfe_size;
8736         }
8737         return 0;
8738 }
8739
8740
8741 /* ------------------------------------------------------------------------ */
8742 /* Function:    ipf_fr_matcharray                                           */
8743 /* Returns:     int      - 0 = match failed, else positive match            */
8744 /* Parameters:  fin(I)   - pointer to packet information                    */
8745 /*              array(I) - pointer to matching array                        */
8746 /*                                                                          */
8747 /* This function is used to apply a matching array against a packet and     */
8748 /* return an indication of whether or not the packet successfully matches   */
8749 /* all of the commands in it.                                               */
8750 /* ------------------------------------------------------------------------ */
8751 static int
8752 ipf_fr_matcharray(fin, array)
8753         fr_info_t *fin;
8754         int *array;
8755 {
8756         int i, n, *x, rv, p;
8757         ipfexp_t *e;
8758
8759         rv = 0;
8760         n = array[0];
8761         x = array + 1;
8762
8763         for (; n > 0; x += 3 + x[3], rv = 0) {
8764                 e = (ipfexp_t *)x;
8765                 if (e->ipfe_cmd == IPF_EXP_END)
8766                         break;
8767                 n -= e->ipfe_size;
8768
8769                 /*
8770                  * The upper 16 bits currently store the protocol value.
8771                  * This is currently used with TCP and UDP port compares and
8772                  * allows "tcp.port = 80" without requiring an explicit
8773                  " "ip.pr = tcp" first.
8774                  */
8775                 p = e->ipfe_cmd >> 16;
8776                 if ((p != 0) && (p != fin->fin_p))
8777                         break;
8778
8779                 switch (e->ipfe_cmd)
8780                 {
8781                 case IPF_EXP_IP_PR :
8782                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8783                                 rv |= (fin->fin_p == e->ipfe_arg0[i]);
8784                         }
8785                         break;
8786
8787                 case IPF_EXP_IP_SRCADDR :
8788                         if (fin->fin_v != 4)
8789                                 break;
8790                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8791                                 rv |= ((fin->fin_saddr &
8792                                         e->ipfe_arg0[i * 2 + 1]) ==
8793                                        e->ipfe_arg0[i * 2]);
8794                         }
8795                         break;
8796
8797                 case IPF_EXP_IP_DSTADDR :
8798                         if (fin->fin_v != 4)
8799                                 break;
8800                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8801                                 rv |= ((fin->fin_daddr &
8802                                         e->ipfe_arg0[i * 2 + 1]) ==
8803                                        e->ipfe_arg0[i * 2]);
8804                         }
8805                         break;
8806
8807                 case IPF_EXP_IP_ADDR :
8808                         if (fin->fin_v != 4)
8809                                 break;
8810                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8811                                 rv |= ((fin->fin_saddr &
8812                                         e->ipfe_arg0[i * 2 + 1]) ==
8813                                        e->ipfe_arg0[i * 2]) ||
8814                                       ((fin->fin_daddr &
8815                                         e->ipfe_arg0[i * 2 + 1]) ==
8816                                        e->ipfe_arg0[i * 2]);
8817                         }
8818                         break;
8819
8820 #ifdef USE_INET6
8821                 case IPF_EXP_IP6_SRCADDR :
8822                         if (fin->fin_v != 6)
8823                                 break;
8824                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8825                                 rv |= IP6_MASKEQ(&fin->fin_src6,
8826                                                  &e->ipfe_arg0[i * 8 + 4],
8827                                                  &e->ipfe_arg0[i * 8]);
8828                         }
8829                         break;
8830
8831                 case IPF_EXP_IP6_DSTADDR :
8832                         if (fin->fin_v != 6)
8833                                 break;
8834                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8835                                 rv |= IP6_MASKEQ(&fin->fin_dst6,
8836                                                  &e->ipfe_arg0[i * 8 + 4],
8837                                                  &e->ipfe_arg0[i * 8]);
8838                         }
8839                         break;
8840
8841                 case IPF_EXP_IP6_ADDR :
8842                         if (fin->fin_v != 6)
8843                                 break;
8844                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8845                                 rv |= IP6_MASKEQ(&fin->fin_src6,
8846                                                  &e->ipfe_arg0[i * 8 + 4],
8847                                                  &e->ipfe_arg0[i * 8]) ||
8848                                       IP6_MASKEQ(&fin->fin_dst6,
8849                                                  &e->ipfe_arg0[i * 8 + 4],
8850                                                  &e->ipfe_arg0[i * 8]);
8851                         }
8852                         break;
8853 #endif
8854
8855                 case IPF_EXP_UDP_PORT :
8856                 case IPF_EXP_TCP_PORT :
8857                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8858                                 rv |= (fin->fin_sport == e->ipfe_arg0[i]) ||
8859                                       (fin->fin_dport == e->ipfe_arg0[i]);
8860                         }
8861                         break;
8862
8863                 case IPF_EXP_UDP_SPORT :
8864                 case IPF_EXP_TCP_SPORT :
8865                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8866                                 rv |= (fin->fin_sport == e->ipfe_arg0[i]);
8867                         }
8868                         break;
8869
8870                 case IPF_EXP_UDP_DPORT :
8871                 case IPF_EXP_TCP_DPORT :
8872                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8873                                 rv |= (fin->fin_dport == e->ipfe_arg0[i]);
8874                         }
8875                         break;
8876
8877                 case IPF_EXP_TCP_FLAGS :
8878                         for (i = 0; !rv && i < e->ipfe_narg; i++) {
8879                                 rv |= ((fin->fin_tcpf &
8880                                         e->ipfe_arg0[i * 2 + 1]) ==
8881                                        e->ipfe_arg0[i * 2]);
8882                         }
8883                         break;
8884                 }
8885                 rv ^= e->ipfe_not;
8886
8887                 if (rv == 0)
8888                         break;
8889         }
8890
8891         return rv;
8892 }
8893
8894
8895 /* ------------------------------------------------------------------------ */
8896 /* Function:    ipf_queueflush                                              */
8897 /* Returns:     int - number of entries flushed (0 = none)                  */
8898 /* Parameters:  softc(I)    - pointer to soft context main structure        */
8899 /*              deletefn(I) - function to call to delete entry              */
8900 /*              ipfqs(I)    - top of the list of ipf internal queues        */
8901 /*              userqs(I)   - top of the list of user defined timeouts      */
8902 /*                                                                          */
8903 /* This fucntion gets called when the state/NAT hash tables fill up and we  */
8904 /* need to try a bit harder to free up some space.  The algorithm used here */
8905 /* split into two parts but both halves have the same goal: to reduce the   */
8906 /* number of connections considered to be "active" to the low watermark.    */
8907 /* There are two steps in doing this:                                       */
8908 /* 1) Remove any TCP connections that are already considered to be "closed" */
8909 /*    but have not yet been removed from the state table.  The two states   */
8910 /*    TCPS_TIME_WAIT and TCPS_CLOSED are considered to be the perfect       */
8911 /*    candidates for this style of removal.  If freeing up entries in       */
8912 /*    CLOSED or both CLOSED and TIME_WAIT brings us to the low watermark,   */
8913 /*    we do not go on to step 2.                                            */
8914 /*                                                                          */
8915 /* 2) Look for the oldest entries on each timeout queue and free them if    */
8916 /*    they are within the given window we are considering.  Where the       */
8917 /*    window starts and the steps taken to increase its size depend upon    */
8918 /*    how long ipf has been running (ipf_ticks.)  Anything modified in the  */
8919 /*    last 30 seconds is not touched.                                       */
8920 /*                                              touched                     */
8921 /*         die     ipf_ticks  30*1.5    1800*1.5   |  43200*1.5             */
8922 /*           |          |        |           |     |     |                  */
8923 /* future <--+----------+--------+-----------+-----+-----+-----------> past */
8924 /*                     now        \_int=30s_/ \_int=1hr_/ \_int=12hr        */
8925 /*                                                                          */
8926 /* Points to note:                                                          */
8927 /* - tqe_die is the time, in the future, when entries die.                  */
8928 /* - tqe_die - ipf_ticks is how long left the connection has to live in ipf */
8929 /*   ticks.                                                                 */
8930 /* - tqe_touched is when the entry was last used by NAT/state               */
8931 /* - the closer tqe_touched is to ipf_ticks, the further tqe_die will be    */
8932 /*   ipf_ticks any given timeout queue and vice versa.                      */
8933 /* - both tqe_die and tqe_touched increase over time                        */
8934 /* - timeout queues are sorted with the highest value of tqe_die at the     */
8935 /*   bottom and therefore the smallest values of each are at the top        */
8936 /* - the pointer passed in as ipfqs should point to an array of timeout     */
8937 /*   queues representing each of the TCP states                             */
8938 /*                                                                          */
8939 /* We start by setting up a maximum range to scan for things to move of     */
8940 /* iend (newest) to istart (oldest) in chunks of "interval".  If nothing is */
8941 /* found in that range, "interval" is adjusted (so long as it isn't 30) and */
8942 /* we start again with a new value for "iend" and "istart".  This is        */
8943 /* continued until we either finish the scan of 30 second intervals or the  */
8944 /* low water mark is reached.                                               */
8945 /* ------------------------------------------------------------------------ */
8946 int
8947 ipf_queueflush(softc, deletefn, ipfqs, userqs, activep, size, low)
8948         ipf_main_softc_t *softc;
8949         ipftq_delete_fn_t deletefn;
8950         ipftq_t *ipfqs, *userqs;
8951         u_int *activep;
8952         int size, low;
8953 {
8954         u_long interval, istart, iend;
8955         ipftq_t *ifq, *ifqnext;
8956         ipftqent_t *tqe, *tqn;
8957         int removed = 0;
8958
8959         for (tqn = ipfqs[IPF_TCPS_CLOSED].ifq_head; ((tqe = tqn) != NULL); ) {
8960                 tqn = tqe->tqe_next;
8961                 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
8962                         removed++;
8963         }
8964         if ((*activep * 100 / size) > low) {
8965                 for (tqn = ipfqs[IPF_TCPS_TIME_WAIT].ifq_head;
8966                      ((tqe = tqn) != NULL); ) {
8967                         tqn = tqe->tqe_next;
8968                         if ((*deletefn)(softc, tqe->tqe_parent) == 0)
8969                                 removed++;
8970                 }
8971         }
8972
8973         if ((*activep * 100 / size) <= low) {
8974                 return removed;
8975         }
8976
8977         /*
8978          * NOTE: Use of "* 15 / 10" is required here because if "* 1.5" is
8979          *       used then the operations are upgraded to floating point
8980          *       and kernels don't like floating point...
8981          */
8982         if (softc->ipf_ticks > IPF_TTLVAL(43200 * 15 / 10)) {
8983                 istart = IPF_TTLVAL(86400 * 4);
8984                 interval = IPF_TTLVAL(43200);
8985         } else if (softc->ipf_ticks > IPF_TTLVAL(1800 * 15 / 10)) {
8986                 istart = IPF_TTLVAL(43200);
8987                 interval = IPF_TTLVAL(1800);
8988         } else if (softc->ipf_ticks > IPF_TTLVAL(30 * 15 / 10)) {
8989                 istart = IPF_TTLVAL(1800);
8990                 interval = IPF_TTLVAL(30);
8991         } else {
8992                 return 0;
8993         }
8994         if (istart > softc->ipf_ticks) {
8995                 if (softc->ipf_ticks - interval < interval)
8996                         istart = interval;
8997                 else
8998                         istart = (softc->ipf_ticks / interval) * interval;
8999         }
9000
9001         iend = softc->ipf_ticks - interval;
9002
9003         while ((*activep * 100 / size) > low) {
9004                 u_long try;
9005
9006                 try = softc->ipf_ticks - istart;
9007
9008                 for (ifq = ipfqs; ifq != NULL; ifq = ifq->ifq_next) {
9009                         for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); ) {
9010                                 if (try < tqe->tqe_touched)
9011                                         break;
9012                                 tqn = tqe->tqe_next;
9013                                 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9014                                         removed++;
9015                         }
9016                 }
9017
9018                 for (ifq = userqs; ifq != NULL; ifq = ifqnext) {
9019                         ifqnext = ifq->ifq_next;
9020
9021                         for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); ) {
9022                                 if (try < tqe->tqe_touched)
9023                                         break;
9024                                 tqn = tqe->tqe_next;
9025                                 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9026                                         removed++;
9027                         }
9028                 }
9029
9030                 if (try >= iend) {
9031                         if (interval == IPF_TTLVAL(43200)) {
9032                                 interval = IPF_TTLVAL(1800);
9033                         } else if (interval == IPF_TTLVAL(1800)) {
9034                                 interval = IPF_TTLVAL(30);
9035                         } else {
9036                                 break;
9037                         }
9038                         if (interval >= softc->ipf_ticks)
9039                                 break;
9040
9041                         iend = softc->ipf_ticks - interval;
9042                 }
9043                 istart -= interval;
9044         }
9045
9046         return removed;
9047 }
9048
9049
9050 /* ------------------------------------------------------------------------ */
9051 /* Function:    ipf_deliverlocal                                            */
9052 /* Returns:     int - 1 = local address, 0 = non-local address              */
9053 /* Parameters:  softc(I)     - pointer to soft context main structure       */
9054 /*              ipversion(I) - IP protocol version (4 or 6)                 */
9055 /*              ifp(I)       - network interface pointer                    */
9056 /*              ipaddr(I)    - IPv4/6 destination address                   */
9057 /*                                                                          */
9058 /* This fucntion is used to determine in the address "ipaddr" belongs to    */
9059 /* the network interface represented by ifp.                                */
9060 /* ------------------------------------------------------------------------ */
9061 int
9062 ipf_deliverlocal(softc, ipversion, ifp, ipaddr)
9063         ipf_main_softc_t *softc;
9064         int ipversion;
9065         void *ifp;
9066         i6addr_t *ipaddr;
9067 {
9068         i6addr_t addr;
9069         int islocal = 0;
9070
9071         if (ipversion == 4) {
9072                 if (ipf_ifpaddr(softc, 4, FRI_NORMAL, ifp, &addr, NULL) == 0) {
9073                         if (addr.in4.s_addr == ipaddr->in4.s_addr)
9074                                 islocal = 1;
9075                 }
9076
9077 #ifdef USE_INET6
9078         } else if (ipversion == 6) {
9079                 if (ipf_ifpaddr(softc, 6, FRI_NORMAL, ifp, &addr, NULL) == 0) {
9080                         if (IP6_EQ(&addr, ipaddr))
9081                                 islocal = 1;
9082                 }
9083 #endif
9084         }
9085
9086         return islocal;
9087 }
9088
9089
9090 /* ------------------------------------------------------------------------ */
9091 /* Function:    ipf_settimeout                                              */
9092 /* Returns:     int - 0 = success, -1 = failure                             */
9093 /* Parameters:  softc(I) - pointer to soft context main structure           */
9094 /*              t(I)     - pointer to tuneable array entry                  */
9095 /*              p(I)     - pointer to values passed in to apply             */
9096 /*                                                                          */
9097 /* This function is called to set the timeout values for each distinct      */
9098 /* queue timeout that is available.  When called, it calls into both the    */
9099 /* state and NAT code, telling them to update their timeout queues.         */
9100 /* ------------------------------------------------------------------------ */
9101 static int
9102 ipf_settimeout(softc, t, p)
9103         struct ipf_main_softc_s *softc;
9104         ipftuneable_t *t;
9105         ipftuneval_t *p;
9106 {
9107
9108         /*
9109          * ipf_interror should be set by the functions called here, not
9110          * by this function - it's just a middle man.
9111          */
9112         if (ipf_state_settimeout(softc, t, p) == -1)
9113                 return -1;
9114         if (ipf_nat_settimeout(softc, t, p) == -1)
9115                 return -1;
9116         return 0;
9117 }
9118
9119
9120 /* ------------------------------------------------------------------------ */
9121 /* Function:    ipf_apply_timeout                                           */
9122 /* Returns:     int - 0 = success, -1 = failure                             */
9123 /* Parameters:  head(I)    - pointer to tuneable array entry                */
9124 /*              seconds(I) - pointer to values passed in to apply           */
9125 /*                                                                          */
9126 /* This function applies a timeout of "seconds" to the timeout queue that   */
9127 /* is pointed to by "head".  All entries on this list have an expiration    */
9128 /* set to be the current tick value of ipf plus the ttl.  Given that this   */
9129 /* function should only be called when the delta is non-zero, the task is   */
9130 /* to walk the entire list and apply the change.  The sort order will not   */
9131 /* change.  The only catch is that this is O(n) across the list, so if the  */
9132 /* queue has lots of entries (10s of thousands or 100s of thousands), it    */
9133 /* could take a relatively long time to work through them all.              */
9134 /* ------------------------------------------------------------------------ */
9135 void
9136 ipf_apply_timeout(head, seconds)
9137         ipftq_t *head;
9138         u_int seconds;
9139 {
9140         u_int oldtimeout, newtimeout;
9141         ipftqent_t *tqe;
9142         int delta;
9143
9144         MUTEX_ENTER(&head->ifq_lock);
9145         oldtimeout = head->ifq_ttl;
9146         newtimeout = IPF_TTLVAL(seconds);
9147         delta = oldtimeout - newtimeout;
9148
9149         head->ifq_ttl = newtimeout;
9150
9151         for (tqe = head->ifq_head; tqe != NULL; tqe = tqe->tqe_next) {
9152                 tqe->tqe_die += delta;
9153         }
9154         MUTEX_EXIT(&head->ifq_lock);
9155 }
9156
9157
9158 /* ------------------------------------------------------------------------ */
9159 /* Function:   ipf_settimeout_tcp                                           */
9160 /* Returns:    int - 0 = successfully applied, -1 = failed                  */
9161 /* Parameters: t(I)   - pointer to tuneable to change                       */
9162 /*             p(I)   - pointer to new timeout information                  */
9163 /*             tab(I) - pointer to table of TCP queues                      */
9164 /*                                                                          */
9165 /* This function applies the new timeout (p) to the TCP tunable (t) and     */
9166 /* updates all of the entries on the relevant timeout queue by calling      */
9167 /* ipf_apply_timeout().                                                     */
9168 /* ------------------------------------------------------------------------ */
9169 int
9170 ipf_settimeout_tcp(t, p, tab)
9171         ipftuneable_t *t;
9172         ipftuneval_t *p;
9173         ipftq_t *tab;
9174 {
9175         if (!strcmp(t->ipft_name, "tcp_idle_timeout") ||
9176             !strcmp(t->ipft_name, "tcp_established")) {
9177                 ipf_apply_timeout(&tab[IPF_TCPS_ESTABLISHED], p->ipftu_int);
9178         } else if (!strcmp(t->ipft_name, "tcp_close_wait")) {
9179                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSE_WAIT], p->ipftu_int);
9180         } else if (!strcmp(t->ipft_name, "tcp_last_ack")) {
9181                 ipf_apply_timeout(&tab[IPF_TCPS_LAST_ACK], p->ipftu_int);
9182         } else if (!strcmp(t->ipft_name, "tcp_timeout")) {
9183                 ipf_apply_timeout(&tab[IPF_TCPS_LISTEN], p->ipftu_int);
9184                 ipf_apply_timeout(&tab[IPF_TCPS_HALF_ESTAB], p->ipftu_int);
9185                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSING], p->ipftu_int);
9186         } else if (!strcmp(t->ipft_name, "tcp_listen")) {
9187                 ipf_apply_timeout(&tab[IPF_TCPS_LISTEN], p->ipftu_int);
9188         } else if (!strcmp(t->ipft_name, "tcp_half_established")) {
9189                 ipf_apply_timeout(&tab[IPF_TCPS_HALF_ESTAB], p->ipftu_int);
9190         } else if (!strcmp(t->ipft_name, "tcp_closing")) {
9191                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSING], p->ipftu_int);
9192         } else if (!strcmp(t->ipft_name, "tcp_syn_received")) {
9193                 ipf_apply_timeout(&tab[IPF_TCPS_SYN_RECEIVED], p->ipftu_int);
9194         } else if (!strcmp(t->ipft_name, "tcp_syn_sent")) {
9195                 ipf_apply_timeout(&tab[IPF_TCPS_SYN_SENT], p->ipftu_int);
9196         } else if (!strcmp(t->ipft_name, "tcp_closed")) {
9197                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSED], p->ipftu_int);
9198         } else if (!strcmp(t->ipft_name, "tcp_half_closed")) {
9199                 ipf_apply_timeout(&tab[IPF_TCPS_CLOSED], p->ipftu_int);
9200         } else if (!strcmp(t->ipft_name, "tcp_time_wait")) {
9201                 ipf_apply_timeout(&tab[IPF_TCPS_TIME_WAIT], p->ipftu_int);
9202         } else {
9203                 /*
9204                  * ipf_interror isn't set here because it should be set
9205                  * by whatever called this function.
9206                  */
9207                 return -1;
9208         }
9209         return 0;
9210 }
9211
9212
9213 /* ------------------------------------------------------------------------ */
9214 /* Function:   ipf_main_soft_create                                         */
9215 /* Returns:    NULL = failure, else success                                 */
9216 /* Parameters: arg(I) - pointer to soft context structure if already allocd */
9217 /*                                                                          */
9218 /* Create the foundation soft context structure. In circumstances where it  */
9219 /* is not required to dynamically allocate the context, a pointer can be    */
9220 /* passed in (rather than NULL) to a structure to be initialised.           */
9221 /* The main thing of interest is that a number of locks are initialised     */
9222 /* here instead of in the where might be expected - in the relevant create  */
9223 /* function elsewhere.  This is done because the current locking design has */
9224 /* some areas where these locks are used outside of their module.           */
9225 /* Possibly the most important exercise that is done here is setting of all */
9226 /* the timeout values, allowing them to be changed before init().           */
9227 /* ------------------------------------------------------------------------ */
9228 void *
9229 ipf_main_soft_create(arg)
9230         void *arg;
9231 {
9232         ipf_main_softc_t *softc;
9233
9234         if (arg == NULL) {
9235                 KMALLOC(softc, ipf_main_softc_t *);
9236                 if (softc == NULL)
9237                         return NULL;
9238         } else {
9239                 softc = arg;
9240         }
9241
9242         bzero((char *)softc, sizeof(*softc));
9243
9244         /*
9245          * This serves as a flag as to whether or not the softc should be
9246          * free'd when _destroy is called.
9247          */
9248         softc->ipf_dynamic_softc = (arg == NULL) ? 1 : 0;
9249
9250         softc->ipf_tuners = ipf_tune_array_copy(softc,
9251                                                 sizeof(ipf_main_tuneables),
9252                                                 ipf_main_tuneables);
9253         if (softc->ipf_tuners == NULL) {
9254                 ipf_main_soft_destroy(softc);
9255                 return NULL;
9256         }
9257
9258         MUTEX_INIT(&softc->ipf_rw, "ipf rw mutex");
9259         MUTEX_INIT(&softc->ipf_timeoutlock, "ipf timeout lock");
9260         RWLOCK_INIT(&softc->ipf_global, "ipf filter load/unload mutex");
9261         RWLOCK_INIT(&softc->ipf_mutex, "ipf filter rwlock");
9262         RWLOCK_INIT(&softc->ipf_tokens, "ipf token rwlock");
9263         RWLOCK_INIT(&softc->ipf_state, "ipf state rwlock");
9264         RWLOCK_INIT(&softc->ipf_nat, "ipf IP NAT rwlock");
9265         RWLOCK_INIT(&softc->ipf_poolrw, "ipf pool rwlock");
9266         RWLOCK_INIT(&softc->ipf_frag, "ipf frag rwlock");
9267
9268         softc->ipf_token_head = NULL;
9269         softc->ipf_token_tail = &softc->ipf_token_head;
9270
9271         softc->ipf_tcpidletimeout = FIVE_DAYS;
9272         softc->ipf_tcpclosewait = IPF_TTLVAL(2 * TCP_MSL);
9273         softc->ipf_tcplastack = IPF_TTLVAL(30);
9274         softc->ipf_tcptimewait = IPF_TTLVAL(2 * TCP_MSL);
9275         softc->ipf_tcptimeout = IPF_TTLVAL(2 * TCP_MSL);
9276         softc->ipf_tcpsynsent = IPF_TTLVAL(2 * TCP_MSL);
9277         softc->ipf_tcpsynrecv = IPF_TTLVAL(2 * TCP_MSL);
9278         softc->ipf_tcpclosed = IPF_TTLVAL(30);
9279         softc->ipf_tcphalfclosed = IPF_TTLVAL(2 * 3600);
9280         softc->ipf_udptimeout = IPF_TTLVAL(120);
9281         softc->ipf_udpacktimeout = IPF_TTLVAL(12);
9282         softc->ipf_icmptimeout = IPF_TTLVAL(60);
9283         softc->ipf_icmpacktimeout = IPF_TTLVAL(6);
9284         softc->ipf_iptimeout = IPF_TTLVAL(60);
9285
9286 #if defined(IPFILTER_DEFAULT_BLOCK)
9287         softc->ipf_pass = FR_BLOCK|FR_NOMATCH;
9288 #else
9289         softc->ipf_pass = (IPF_DEFAULT_PASS)|FR_NOMATCH;
9290 #endif
9291         softc->ipf_minttl = 4;
9292         softc->ipf_icmpminfragmtu = 68;
9293         softc->ipf_flags = IPF_LOGGING;
9294
9295         return softc;
9296 }
9297
9298 /* ------------------------------------------------------------------------ */
9299 /* Function:   ipf_main_soft_init                                           */
9300 /* Returns:    0 = success, -1 = failure                                    */
9301 /* Parameters: softc(I) - pointer to soft context main structure            */
9302 /*                                                                          */
9303 /* A null-op function that exists as a placeholder so that the flow in      */
9304 /* other functions is obvious.                                              */
9305 /* ------------------------------------------------------------------------ */
9306 /*ARGSUSED*/
9307 int
9308 ipf_main_soft_init(softc)
9309         ipf_main_softc_t *softc;
9310 {
9311         return 0;
9312 }
9313
9314
9315 /* ------------------------------------------------------------------------ */
9316 /* Function:   ipf_main_soft_destroy                                        */
9317 /* Returns:    void                                                         */
9318 /* Parameters: softc(I) - pointer to soft context main structure            */
9319 /*                                                                          */
9320 /* Undo everything that we did in ipf_main_soft_create.                     */
9321 /*                                                                          */
9322 /* The most important check that needs to be made here is whether or not    */
9323 /* the structure was allocated by ipf_main_soft_create() by checking what   */
9324 /* value is stored in ipf_dynamic_main.                                     */
9325 /* ------------------------------------------------------------------------ */
9326 /*ARGSUSED*/
9327 void
9328 ipf_main_soft_destroy(softc)
9329         ipf_main_softc_t *softc;
9330 {
9331
9332         RW_DESTROY(&softc->ipf_frag);
9333         RW_DESTROY(&softc->ipf_poolrw);
9334         RW_DESTROY(&softc->ipf_nat);
9335         RW_DESTROY(&softc->ipf_state);
9336         RW_DESTROY(&softc->ipf_tokens);
9337         RW_DESTROY(&softc->ipf_mutex);
9338         RW_DESTROY(&softc->ipf_global);
9339         MUTEX_DESTROY(&softc->ipf_timeoutlock);
9340         MUTEX_DESTROY(&softc->ipf_rw);
9341
9342         if (softc->ipf_tuners != NULL) {
9343                 KFREES(softc->ipf_tuners, sizeof(ipf_main_tuneables));
9344         }
9345         if (softc->ipf_dynamic_softc == 1) {
9346                 KFREE(softc);
9347         }
9348 }
9349
9350
9351 /* ------------------------------------------------------------------------ */
9352 /* Function:   ipf_main_soft_fini                                           */
9353 /* Returns:    0 = success, -1 = failure                                    */
9354 /* Parameters: softc(I) - pointer to soft context main structure            */
9355 /*                                                                          */
9356 /* Clean out the rules which have been added since _init was last called,   */
9357 /* the only dynamic part of the mainline.                                   */
9358 /* ------------------------------------------------------------------------ */
9359 int
9360 ipf_main_soft_fini(softc)
9361         ipf_main_softc_t *softc;
9362 {
9363         (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
9364         (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE);
9365         (void) ipf_flush(softc, IPL_LOGCOUNT, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
9366         (void) ipf_flush(softc, IPL_LOGCOUNT, FR_INQUE|FR_OUTQUE);
9367
9368         return 0;
9369 }
9370
9371
9372 /* ------------------------------------------------------------------------ */
9373 /* Function:   ipf_main_load                                                */
9374 /* Returns:    0 = success, -1 = failure                                    */
9375 /* Parameters: none                                                         */
9376 /*                                                                          */
9377 /* Handle global initialisation that needs to be done for the base part of  */
9378 /* IPFilter. At present this just amounts to initialising some ICMP lookup  */
9379 /* arrays that get used by the state/NAT code.                              */
9380 /* ------------------------------------------------------------------------ */
9381 int
9382 ipf_main_load()
9383 {
9384         int i;
9385
9386         /* fill icmp reply type table */
9387         for (i = 0; i <= ICMP_MAXTYPE; i++)
9388                 icmpreplytype4[i] = -1;
9389         icmpreplytype4[ICMP_ECHO] = ICMP_ECHOREPLY;
9390         icmpreplytype4[ICMP_TSTAMP] = ICMP_TSTAMPREPLY;
9391         icmpreplytype4[ICMP_IREQ] = ICMP_IREQREPLY;
9392         icmpreplytype4[ICMP_MASKREQ] = ICMP_MASKREPLY;
9393
9394 #ifdef  USE_INET6
9395         /* fill icmp reply type table */
9396         for (i = 0; i <= ICMP6_MAXTYPE; i++)
9397                 icmpreplytype6[i] = -1;
9398         icmpreplytype6[ICMP6_ECHO_REQUEST] = ICMP6_ECHO_REPLY;
9399         icmpreplytype6[ICMP6_MEMBERSHIP_QUERY] = ICMP6_MEMBERSHIP_REPORT;
9400         icmpreplytype6[ICMP6_NI_QUERY] = ICMP6_NI_REPLY;
9401         icmpreplytype6[ND_ROUTER_SOLICIT] = ND_ROUTER_ADVERT;
9402         icmpreplytype6[ND_NEIGHBOR_SOLICIT] = ND_NEIGHBOR_ADVERT;
9403 #endif
9404
9405         return 0;
9406 }
9407
9408
9409 /* ------------------------------------------------------------------------ */
9410 /* Function:   ipf_main_unload                                              */
9411 /* Returns:    0 = success, -1 = failure                                    */
9412 /* Parameters: none                                                         */
9413 /*                                                                          */
9414 /* A null-op function that exists as a placeholder so that the flow in      */
9415 /* other functions is obvious.                                              */
9416 /* ------------------------------------------------------------------------ */
9417 int
9418 ipf_main_unload()
9419 {
9420         return 0;
9421 }
9422
9423
9424 /* ------------------------------------------------------------------------ */
9425 /* Function:   ipf_load_all                                                 */
9426 /* Returns:    0 = success, -1 = failure                                    */
9427 /* Parameters: none                                                         */
9428 /*                                                                          */
9429 /* Work through all of the subsystems inside IPFilter and call the load     */
9430 /* function for each in an order that won't lead to a crash :)              */
9431 /* ------------------------------------------------------------------------ */
9432 int
9433 ipf_load_all()
9434 {
9435         if (ipf_main_load() == -1)
9436                 return -1;
9437
9438         if (ipf_state_main_load() == -1)
9439                 return -1;
9440
9441         if (ipf_nat_main_load() == -1)
9442                 return -1;
9443
9444         if (ipf_frag_main_load() == -1)
9445                 return -1;
9446
9447         if (ipf_auth_main_load() == -1)
9448                 return -1;
9449
9450         if (ipf_proxy_main_load() == -1)
9451                 return -1;
9452
9453         return 0;
9454 }
9455
9456
9457 /* ------------------------------------------------------------------------ */
9458 /* Function:   ipf_unload_all                                               */
9459 /* Returns:    0 = success, -1 = failure                                    */
9460 /* Parameters: none                                                         */
9461 /*                                                                          */
9462 /* Work through all of the subsystems inside IPFilter and call the unload   */
9463 /* function for each in an order that won't lead to a crash :)              */
9464 /* ------------------------------------------------------------------------ */
9465 int
9466 ipf_unload_all()
9467 {
9468         if (ipf_proxy_main_unload() == -1)
9469                 return -1;
9470
9471         if (ipf_auth_main_unload() == -1)
9472                 return -1;
9473
9474         if (ipf_frag_main_unload() == -1)
9475                 return -1;
9476
9477         if (ipf_nat_main_unload() == -1)
9478                 return -1;
9479
9480         if (ipf_state_main_unload() == -1)
9481                 return -1;
9482
9483         if (ipf_main_unload() == -1)
9484                 return -1;
9485
9486         return 0;
9487 }
9488
9489
9490 /* ------------------------------------------------------------------------ */
9491 /* Function:   ipf_create_all                                               */
9492 /* Returns:    NULL = failure, else success                                 */
9493 /* Parameters: arg(I) - pointer to soft context main structure              */
9494 /*                                                                          */
9495 /* Work through all of the subsystems inside IPFilter and call the create   */
9496 /* function for each in an order that won't lead to a crash :)              */
9497 /* ------------------------------------------------------------------------ */
9498 ipf_main_softc_t *
9499 ipf_create_all(arg)
9500         void *arg;
9501 {
9502         ipf_main_softc_t *softc;
9503
9504         softc = ipf_main_soft_create(arg);
9505         if (softc == NULL)
9506                 return NULL;
9507
9508 #ifdef IPFILTER_LOG
9509         softc->ipf_log_soft = ipf_log_soft_create(softc);
9510         if (softc->ipf_log_soft == NULL) {
9511                 ipf_destroy_all(softc);
9512                 return NULL;
9513         }
9514 #endif
9515
9516         softc->ipf_lookup_soft = ipf_lookup_soft_create(softc);
9517         if (softc->ipf_lookup_soft == NULL) {
9518                 ipf_destroy_all(softc);
9519                 return NULL;
9520         }
9521
9522         softc->ipf_sync_soft = ipf_sync_soft_create(softc);
9523         if (softc->ipf_sync_soft == NULL) {
9524                 ipf_destroy_all(softc);
9525                 return NULL;
9526         }
9527
9528         softc->ipf_state_soft = ipf_state_soft_create(softc);
9529         if (softc->ipf_state_soft == NULL) {
9530                 ipf_destroy_all(softc);
9531                 return NULL;
9532         }
9533
9534         softc->ipf_nat_soft = ipf_nat_soft_create(softc);
9535         if (softc->ipf_nat_soft == NULL) {
9536                 ipf_destroy_all(softc);
9537                 return NULL;
9538         }
9539
9540         softc->ipf_frag_soft = ipf_frag_soft_create(softc);
9541         if (softc->ipf_frag_soft == NULL) {
9542                 ipf_destroy_all(softc);
9543                 return NULL;
9544         }
9545
9546         softc->ipf_auth_soft = ipf_auth_soft_create(softc);
9547         if (softc->ipf_auth_soft == NULL) {
9548                 ipf_destroy_all(softc);
9549                 return NULL;
9550         }
9551
9552         softc->ipf_proxy_soft = ipf_proxy_soft_create(softc);
9553         if (softc->ipf_proxy_soft == NULL) {
9554                 ipf_destroy_all(softc);
9555                 return NULL;
9556         }
9557
9558         return softc;
9559 }
9560
9561
9562 /* ------------------------------------------------------------------------ */
9563 /* Function:   ipf_destroy_all                                              */
9564 /* Returns:    void                                                         */
9565 /* Parameters: softc(I) - pointer to soft context main structure            */
9566 /*                                                                          */
9567 /* Work through all of the subsystems inside IPFilter and call the destroy  */
9568 /* function for each in an order that won't lead to a crash :)              */
9569 /*                                                                          */
9570 /* Every one of these functions is expected to succeed, so there is no      */
9571 /* checking of return values.                                               */
9572 /* ------------------------------------------------------------------------ */
9573 void
9574 ipf_destroy_all(softc)
9575         ipf_main_softc_t *softc;
9576 {
9577
9578         if (softc->ipf_state_soft != NULL) {
9579                 ipf_state_soft_destroy(softc, softc->ipf_state_soft);
9580                 softc->ipf_state_soft = NULL;
9581         }
9582
9583         if (softc->ipf_nat_soft != NULL) {
9584                 ipf_nat_soft_destroy(softc, softc->ipf_nat_soft);
9585                 softc->ipf_nat_soft = NULL;
9586         }
9587
9588         if (softc->ipf_frag_soft != NULL) {
9589                 ipf_frag_soft_destroy(softc, softc->ipf_frag_soft);
9590                 softc->ipf_frag_soft = NULL;
9591         }
9592
9593         if (softc->ipf_auth_soft != NULL) {
9594                 ipf_auth_soft_destroy(softc, softc->ipf_auth_soft);
9595                 softc->ipf_auth_soft = NULL;
9596         }
9597
9598         if (softc->ipf_proxy_soft != NULL) {
9599                 ipf_proxy_soft_destroy(softc, softc->ipf_proxy_soft);
9600                 softc->ipf_proxy_soft = NULL;
9601         }
9602
9603         if (softc->ipf_sync_soft != NULL) {
9604                 ipf_sync_soft_destroy(softc, softc->ipf_sync_soft);
9605                 softc->ipf_sync_soft = NULL;
9606         }
9607
9608         if (softc->ipf_lookup_soft != NULL) {
9609                 ipf_lookup_soft_destroy(softc, softc->ipf_lookup_soft);
9610                 softc->ipf_lookup_soft = NULL;
9611         }
9612
9613 #ifdef IPFILTER_LOG
9614         if (softc->ipf_log_soft != NULL) {
9615                 ipf_log_soft_destroy(softc, softc->ipf_log_soft);
9616                 softc->ipf_log_soft = NULL;
9617         }
9618 #endif
9619
9620         ipf_main_soft_destroy(softc);
9621 }
9622
9623
9624 /* ------------------------------------------------------------------------ */
9625 /* Function:   ipf_init_all                                                 */
9626 /* Returns:    0 = success, -1 = failure                                    */
9627 /* Parameters: softc(I) - pointer to soft context main structure            */
9628 /*                                                                          */
9629 /* Work through all of the subsystems inside IPFilter and call the init     */
9630 /* function for each in an order that won't lead to a crash :)              */
9631 /* ------------------------------------------------------------------------ */
9632 int
9633 ipf_init_all(softc)
9634         ipf_main_softc_t *softc;
9635 {
9636
9637         if (ipf_main_soft_init(softc) == -1)
9638                 return -1;
9639
9640 #ifdef IPFILTER_LOG
9641         if (ipf_log_soft_init(softc, softc->ipf_log_soft) == -1)
9642                 return -1;
9643 #endif
9644
9645         if (ipf_lookup_soft_init(softc, softc->ipf_lookup_soft) == -1)
9646                 return -1;
9647
9648         if (ipf_sync_soft_init(softc, softc->ipf_sync_soft) == -1)
9649                 return -1;
9650
9651         if (ipf_state_soft_init(softc, softc->ipf_state_soft) == -1)
9652                 return -1;
9653
9654         if (ipf_nat_soft_init(softc, softc->ipf_nat_soft) == -1)
9655                 return -1;
9656
9657         if (ipf_frag_soft_init(softc, softc->ipf_frag_soft) == -1)
9658                 return -1;
9659
9660         if (ipf_auth_soft_init(softc, softc->ipf_auth_soft) == -1)
9661                 return -1;
9662
9663         if (ipf_proxy_soft_init(softc, softc->ipf_proxy_soft) == -1)
9664                 return -1;
9665
9666         return 0;
9667 }
9668
9669
9670 /* ------------------------------------------------------------------------ */
9671 /* Function:   ipf_fini_all                                                 */
9672 /* Returns:    0 = success, -1 = failure                                    */
9673 /* Parameters: softc(I) - pointer to soft context main structure            */
9674 /*                                                                          */
9675 /* Work through all of the subsystems inside IPFilter and call the fini     */
9676 /* function for each in an order that won't lead to a crash :)              */
9677 /* ------------------------------------------------------------------------ */
9678 int
9679 ipf_fini_all(softc)
9680         ipf_main_softc_t *softc;
9681 {
9682
9683         ipf_token_flush(softc);
9684
9685         if (ipf_proxy_soft_fini(softc, softc->ipf_proxy_soft) == -1)
9686                 return -1;
9687
9688         if (ipf_auth_soft_fini(softc, softc->ipf_auth_soft) == -1)
9689                 return -1;
9690
9691         if (ipf_frag_soft_fini(softc, softc->ipf_frag_soft) == -1)
9692                 return -1;
9693
9694         if (ipf_nat_soft_fini(softc, softc->ipf_nat_soft) == -1)
9695                 return -1;
9696
9697         if (ipf_state_soft_fini(softc, softc->ipf_state_soft) == -1)
9698                 return -1;
9699
9700         if (ipf_sync_soft_fini(softc, softc->ipf_sync_soft) == -1)
9701                 return -1;
9702
9703         if (ipf_lookup_soft_fini(softc, softc->ipf_lookup_soft) == -1)
9704                 return -1;
9705
9706 #ifdef IPFILTER_LOG
9707         if (ipf_log_soft_fini(softc, softc->ipf_log_soft) == -1)
9708                 return -1;
9709 #endif
9710
9711         if (ipf_main_soft_fini(softc) == -1)
9712                 return -1;
9713
9714         return 0;
9715 }
9716
9717
9718 /* ------------------------------------------------------------------------ */
9719 /* Function:    ipf_rule_expire                                             */
9720 /* Returns:     Nil                                                         */
9721 /* Parameters:  softc(I) - pointer to soft context main structure           */
9722 /*                                                                          */
9723 /* At present this function exists just to support temporary addition of    */
9724 /* firewall rules. Both inactive and active lists are scanned for items to  */
9725 /* purge, as by rights, the expiration is computed as soon as the rule is   */
9726 /* loaded in.                                                               */
9727 /* ------------------------------------------------------------------------ */
9728 void
9729 ipf_rule_expire(softc)
9730         ipf_main_softc_t *softc;
9731 {
9732         frentry_t *fr;
9733
9734         if ((softc->ipf_rule_explist[0] == NULL) &&
9735             (softc->ipf_rule_explist[1] == NULL))
9736                 return;
9737
9738         WRITE_ENTER(&softc->ipf_mutex);
9739
9740         while ((fr = softc->ipf_rule_explist[0]) != NULL) {
9741                 /*
9742                  * Because the list is kept sorted on insertion, the fist
9743                  * one that dies in the future means no more work to do.
9744                  */
9745                 if (fr->fr_die > softc->ipf_ticks)
9746                         break;
9747                 ipf_rule_delete(softc, fr, IPL_LOGIPF, 0);
9748         }
9749
9750         while ((fr = softc->ipf_rule_explist[1]) != NULL) {
9751                 /*
9752                  * Because the list is kept sorted on insertion, the fist
9753                  * one that dies in the future means no more work to do.
9754                  */
9755                 if (fr->fr_die > softc->ipf_ticks)
9756                         break;
9757                 ipf_rule_delete(softc, fr, IPL_LOGIPF, 1);
9758         }
9759
9760         RWLOCK_EXIT(&softc->ipf_mutex);
9761 }
9762
9763
9764 static int ipf_ht_node_cmp __P((struct host_node_s *, struct host_node_s *));
9765 static void ipf_ht_node_make_key __P((host_track_t *, host_node_t *, int,
9766                                       i6addr_t *));
9767
9768 host_node_t RBI_ZERO(ipf_rb);
9769 RBI_CODE(ipf_rb, host_node_t, hn_entry, ipf_ht_node_cmp)
9770
9771
9772 /* ------------------------------------------------------------------------ */
9773 /* Function:    ipf_ht_node_cmp                                             */
9774 /* Returns:     int   - 0 == nodes are the same, ..                         */
9775 /* Parameters:  k1(I) - pointer to first key to compare                     */
9776 /*              k2(I) - pointer to second key to compare                    */
9777 /*                                                                          */
9778 /* The "key" for the node is a combination of two fields: the address       */
9779 /* family and the address itself.                                           */
9780 /*                                                                          */
9781 /* Because we're not actually interpreting the address data, it isn't       */
9782 /* necessary to convert them to/from network/host byte order. The mask is   */
9783 /* just used to remove bits that aren't significant - it doesn't matter     */
9784 /* where they are, as long as they're always in the same place.             */
9785 /*                                                                          */
9786 /* As with IP6_EQ, comparing IPv6 addresses starts at the bottom because    */
9787 /* this is where individual ones will differ the most - but not true for    */
9788 /* for /48's, etc.                                                          */
9789 /* ------------------------------------------------------------------------ */
9790 static int
9791 ipf_ht_node_cmp(k1, k2)
9792         struct host_node_s *k1, *k2;
9793 {
9794         int i;
9795
9796         i = (k2->hn_addr.adf_family - k1->hn_addr.adf_family);
9797         if (i != 0)
9798                 return i;
9799
9800         if (k1->hn_addr.adf_family == AF_INET)
9801                 return (k2->hn_addr.adf_addr.in4.s_addr -
9802                         k1->hn_addr.adf_addr.in4.s_addr);
9803
9804         i = k2->hn_addr.adf_addr.i6[3] - k1->hn_addr.adf_addr.i6[3];
9805         if (i != 0)
9806                 return i;
9807         i = k2->hn_addr.adf_addr.i6[2] - k1->hn_addr.adf_addr.i6[2];
9808         if (i != 0)
9809                 return i;
9810         i = k2->hn_addr.adf_addr.i6[1] - k1->hn_addr.adf_addr.i6[1];
9811         if (i != 0)
9812                 return i;
9813         i = k2->hn_addr.adf_addr.i6[0] - k1->hn_addr.adf_addr.i6[0];
9814         return i;
9815 }
9816
9817
9818 /* ------------------------------------------------------------------------ */
9819 /* Function:    ipf_ht_node_make_key                                        */
9820 /* Returns:     Nil                                                         */
9821 /* parameters:  htp(I)    - pointer to address tracking structure           */
9822 /*              key(I)    - where to store masked address for lookup        */
9823 /*              family(I) - protocol family of address                      */
9824 /*              addr(I)   - pointer to network address                      */
9825 /*                                                                          */
9826 /* Using the "netmask" (number of bits) stored parent host tracking struct, */
9827 /* copy the address passed in into the key structure whilst masking out the */
9828 /* bits that we don't want.                                                 */
9829 /*                                                                          */
9830 /* Because the parser will set ht_netmask to 128 if there is no protocol    */
9831 /* specified (the parser doesn't know if it should be a v4 or v6 rule), we  */
9832 /* have to be wary of that and not allow 32-128 to happen.                  */
9833 /* ------------------------------------------------------------------------ */
9834 static void
9835 ipf_ht_node_make_key(htp, key, family, addr)
9836         host_track_t *htp;
9837         host_node_t *key;
9838         int family;
9839         i6addr_t *addr;
9840 {
9841         key->hn_addr.adf_family = family;
9842         if (family == AF_INET) {
9843                 u_32_t mask;
9844                 int bits;
9845
9846                 key->hn_addr.adf_len = sizeof(key->hn_addr.adf_addr.in4);
9847                 bits = htp->ht_netmask;
9848                 if (bits >= 32) {
9849                         mask = 0xffffffff;
9850                 } else {
9851                         mask = htonl(0xffffffff << (32 - bits));
9852                 }
9853                 key->hn_addr.adf_addr.in4.s_addr = addr->in4.s_addr & mask;
9854 #ifdef USE_INET6
9855         } else {
9856                 int bits = htp->ht_netmask;
9857
9858                 key->hn_addr.adf_len = sizeof(key->hn_addr.adf_addr.in6);
9859                 if (bits > 96) {
9860                         key->hn_addr.adf_addr.i6[3] = addr->i6[3] &
9861                                              htonl(0xffffffff << (128 - bits));
9862                         key->hn_addr.adf_addr.i6[2] = addr->i6[2];
9863                         key->hn_addr.adf_addr.i6[1] = addr->i6[2];
9864                         key->hn_addr.adf_addr.i6[0] = addr->i6[2];
9865                 } else if (bits > 64) {
9866                         key->hn_addr.adf_addr.i6[3] = 0;
9867                         key->hn_addr.adf_addr.i6[2] = addr->i6[2] &
9868                                              htonl(0xffffffff << (96 - bits));
9869                         key->hn_addr.adf_addr.i6[1] = addr->i6[1];
9870                         key->hn_addr.adf_addr.i6[0] = addr->i6[0];
9871                 } else if (bits > 32) {
9872                         key->hn_addr.adf_addr.i6[3] = 0;
9873                         key->hn_addr.adf_addr.i6[2] = 0;
9874                         key->hn_addr.adf_addr.i6[1] = addr->i6[1] &
9875                                              htonl(0xffffffff << (64 - bits));
9876                         key->hn_addr.adf_addr.i6[0] = addr->i6[0];
9877                 } else {
9878                         key->hn_addr.adf_addr.i6[3] = 0;
9879                         key->hn_addr.adf_addr.i6[2] = 0;
9880                         key->hn_addr.adf_addr.i6[1] = 0;
9881                         key->hn_addr.adf_addr.i6[0] = addr->i6[0] &
9882                                              htonl(0xffffffff << (32 - bits));
9883                 }
9884 #endif
9885         }
9886 }
9887
9888
9889 /* ------------------------------------------------------------------------ */
9890 /* Function:    ipf_ht_node_add                                             */
9891 /* Returns:     int       - 0 == success,  -1 == failure                    */
9892 /* Parameters:  softc(I)  - pointer to soft context main structure          */
9893 /*              htp(I)    - pointer to address tracking structure           */
9894 /*              family(I) - protocol family of address                      */
9895 /*              addr(I)   - pointer to network address                      */
9896 /*                                                                          */
9897 /* NOTE: THIS FUNCTION MUST BE CALLED WITH AN EXCLUSIVE LOCK THAT PREVENTS  */
9898 /*       ipf_ht_node_del FROM RUNNING CONCURRENTLY ON THE SAME htp.         */
9899 /*                                                                          */
9900 /* After preparing the key with the address information to find, look in    */
9901 /* the red-black tree to see if the address is known. A successful call to  */
9902 /* this function can mean one of two things: a new node was added to the    */
9903 /* tree or a matching node exists and we're able to bump up its activity.   */
9904 /* ------------------------------------------------------------------------ */
9905 int
9906 ipf_ht_node_add(softc, htp, family, addr)
9907         ipf_main_softc_t *softc;
9908         host_track_t *htp;
9909         int family;
9910         i6addr_t *addr;
9911 {
9912         host_node_t *h;
9913         host_node_t k;
9914
9915         ipf_ht_node_make_key(htp, &k, family, addr);
9916
9917         h = RBI_SEARCH(ipf_rb, &htp->ht_root, &k);
9918         if (h == NULL) {
9919                 if (htp->ht_cur_nodes >= htp->ht_max_nodes)
9920                         return -1;
9921                 KMALLOC(h, host_node_t *);
9922                 if (h == NULL) {
9923                         DT(ipf_rb_no_mem);
9924                         LBUMP(ipf_rb_no_mem);
9925                         return -1;
9926                 }
9927
9928                 /*
9929                  * If there was a macro to initialise the RB node then that
9930                  * would get used here, but there isn't...
9931                  */
9932                 bzero((char *)h, sizeof(*h));
9933                 h->hn_addr = k.hn_addr;
9934                 h->hn_addr.adf_family = k.hn_addr.adf_family;
9935                 RBI_INSERT(ipf_rb, &htp->ht_root, h);
9936                 htp->ht_cur_nodes++;
9937         } else {
9938                 if ((htp->ht_max_per_node != 0) &&
9939                     (h->hn_active >= htp->ht_max_per_node)) {
9940                         DT(ipf_rb_node_max);
9941                         LBUMP(ipf_rb_node_max);
9942                         return -1;
9943                 }
9944         }
9945
9946         h->hn_active++;
9947
9948         return 0;
9949 }
9950
9951
9952 /* ------------------------------------------------------------------------ */
9953 /* Function:    ipf_ht_node_del                                             */
9954 /* Returns:     int       - 0 == success,  -1 == failure                    */
9955 /* parameters:  htp(I)    - pointer to address tracking structure           */
9956 /*              family(I) - protocol family of address                      */
9957 /*              addr(I)   - pointer to network address                      */
9958 /*                                                                          */
9959 /* NOTE: THIS FUNCTION MUST BE CALLED WITH AN EXCLUSIVE LOCK THAT PREVENTS  */
9960 /*       ipf_ht_node_add FROM RUNNING CONCURRENTLY ON THE SAME htp.         */
9961 /*                                                                          */
9962 /* Try and find the address passed in amongst the leavese on this tree to   */
9963 /* be friend. If found then drop the active account for that node drops by  */
9964 /* one. If that count reaches 0, it is time to free it all up.              */
9965 /* ------------------------------------------------------------------------ */
9966 int
9967 ipf_ht_node_del(htp, family, addr)
9968         host_track_t *htp;
9969         int family;
9970         i6addr_t *addr;
9971 {
9972         host_node_t *h;
9973         host_node_t k;
9974
9975         ipf_ht_node_make_key(htp, &k, family, addr);
9976
9977         h = RBI_SEARCH(ipf_rb, &htp->ht_root, &k);
9978         if (h == NULL) {
9979                 return -1;
9980         } else {
9981                 h->hn_active--;
9982                 if (h->hn_active == 0) {
9983                         (void) RBI_DELETE(ipf_rb, &htp->ht_root, h);
9984                         htp->ht_cur_nodes--;
9985                         KFREE(h);
9986                 }
9987         }
9988
9989         return 0;
9990 }
9991
9992
9993 /* ------------------------------------------------------------------------ */
9994 /* Function:    ipf_rb_ht_init                                              */
9995 /* Returns:     Nil                                                         */
9996 /* Parameters:  head(I) - pointer to host tracking structure                */
9997 /*                                                                          */
9998 /* Initialise the host tracking structure to be ready for use above.        */
9999 /* ------------------------------------------------------------------------ */
10000 void
10001 ipf_rb_ht_init(head)
10002         host_track_t *head;
10003 {
10004         RBI_INIT(ipf_rb, &head->ht_root);
10005 }
10006
10007
10008 /* ------------------------------------------------------------------------ */
10009 /* Function:    ipf_rb_ht_freenode                                          */
10010 /* Returns:     Nil                                                         */
10011 /* Parameters:  head(I) - pointer to host tracking structure                */
10012 /*              arg(I)  - additional argument from walk caller              */
10013 /*                                                                          */
10014 /* Free an actual host_node_t structure.                                    */
10015 /* ------------------------------------------------------------------------ */
10016 void
10017 ipf_rb_ht_freenode(node, arg)
10018         host_node_t *node;
10019         void *arg;
10020 {
10021         KFREE(node);
10022 }
10023
10024
10025 /* ------------------------------------------------------------------------ */
10026 /* Function:    ipf_rb_ht_flush                                             */
10027 /* Returns:     Nil                                                         */
10028 /* Parameters:  head(I) - pointer to host tracking structure                */
10029 /*                                                                          */
10030 /* Remove all of the nodes in the tree tracking hosts by calling a walker   */
10031 /* and free'ing each one.                                                   */
10032 /* ------------------------------------------------------------------------ */
10033 void
10034 ipf_rb_ht_flush(head)
10035         host_track_t *head;
10036 {
10037         RBI_WALK(ipf_rb, &head->ht_root, ipf_rb_ht_freenode, NULL);
10038 }
10039
10040
10041 /* ------------------------------------------------------------------------ */
10042 /* Function:    ipf_slowtimer                                               */
10043 /* Returns:     Nil                                                         */
10044 /* Parameters:  ptr(I) - pointer to main ipf soft context structure         */
10045 /*                                                                          */
10046 /* Slowly expire held state for fragments.  Timeouts are set * in           */
10047 /* expectation of this being called twice per second.                       */
10048 /* ------------------------------------------------------------------------ */
10049 void
10050 ipf_slowtimer(softc)
10051         ipf_main_softc_t *softc;
10052 {
10053
10054         ipf_token_expire(softc);
10055         ipf_frag_expire(softc);
10056         ipf_state_expire(softc);
10057         ipf_nat_expire(softc);
10058         ipf_auth_expire(softc);
10059         ipf_lookup_expire(softc);
10060         ipf_rule_expire(softc);
10061         ipf_sync_expire(softc);
10062         softc->ipf_ticks++;
10063 }
10064
10065
10066 /* ------------------------------------------------------------------------ */
10067 /* Function:    ipf_inet_mask_add                                           */
10068 /* Returns:     Nil                                                         */
10069 /* Parameters:  bits(I) - pointer to nat context information                */
10070 /*              mtab(I) - pointer to mask hash table structure              */
10071 /*                                                                          */
10072 /* When called, bits represents the mask of a new NAT rule that has just    */
10073 /* been added. This function inserts a bitmask into the array of masks to   */
10074 /* search when searching for a matching NAT rule for a packet.              */
10075 /* Prevention of duplicate masks is achieved by checking the use count for  */
10076 /* a given netmask.                                                         */
10077 /* ------------------------------------------------------------------------ */
10078 void
10079 ipf_inet_mask_add(bits, mtab)
10080         int bits;
10081         ipf_v4_masktab_t *mtab;
10082 {
10083         u_32_t mask;
10084         int i, j;
10085
10086         mtab->imt4_masks[bits]++;
10087         if (mtab->imt4_masks[bits] > 1)
10088                 return;
10089
10090         if (bits == 0)
10091                 mask = 0;
10092         else
10093                 mask = 0xffffffff << (32 - bits);
10094
10095         for (i = 0; i < 33; i++) {
10096                 if (ntohl(mtab->imt4_active[i]) < mask) {
10097                         for (j = 32; j > i; j--)
10098                                 mtab->imt4_active[j] = mtab->imt4_active[j - 1];
10099                         mtab->imt4_active[i] = htonl(mask);
10100                         break;
10101                 }
10102         }
10103         mtab->imt4_max++;
10104 }
10105
10106
10107 /* ------------------------------------------------------------------------ */
10108 /* Function:    ipf_inet_mask_del                                           */
10109 /* Returns:     Nil                                                         */
10110 /* Parameters:  bits(I) - number of bits set in the netmask                 */
10111 /*              mtab(I) - pointer to mask hash table structure              */
10112 /*                                                                          */
10113 /* Remove the 32bit bitmask represented by "bits" from the collection of    */
10114 /* netmasks stored inside of mtab.                                          */
10115 /* ------------------------------------------------------------------------ */
10116 void
10117 ipf_inet_mask_del(bits, mtab)
10118         int bits;
10119         ipf_v4_masktab_t *mtab;
10120 {
10121         u_32_t mask;
10122         int i, j;
10123
10124         mtab->imt4_masks[bits]--;
10125         if (mtab->imt4_masks[bits] > 0)
10126                 return;
10127
10128         mask = htonl(0xffffffff << (32 - bits));
10129         for (i = 0; i < 33; i++) {
10130                 if (mtab->imt4_active[i] == mask) {
10131                         for (j = i + 1; j < 33; j++)
10132                                 mtab->imt4_active[j - 1] = mtab->imt4_active[j];
10133                         break;
10134                 }
10135         }
10136         mtab->imt4_max--;
10137         ASSERT(mtab->imt4_max >= 0);
10138 }
10139
10140
10141 #ifdef USE_INET6
10142 /* ------------------------------------------------------------------------ */
10143 /* Function:    ipf_inet6_mask_add                                          */
10144 /* Returns:     Nil                                                         */
10145 /* Parameters:  bits(I) - number of bits set in mask                        */
10146 /*              mask(I) - pointer to mask to add                            */
10147 /*              mtab(I) - pointer to mask hash table structure              */
10148 /*                                                                          */
10149 /* When called, bitcount represents the mask of a IPv6 NAT map rule that    */
10150 /* has just been added. This function inserts a bitmask into the array of   */
10151 /* masks to search when searching for a matching NAT rule for a packet.     */
10152 /* Prevention of duplicate masks is achieved by checking the use count for  */
10153 /* a given netmask.                                                         */
10154 /* ------------------------------------------------------------------------ */
10155 void
10156 ipf_inet6_mask_add(bits, mask, mtab)
10157         int bits;
10158         i6addr_t *mask;
10159         ipf_v6_masktab_t *mtab;
10160 {
10161         i6addr_t zero;
10162         int i, j;
10163
10164         mtab->imt6_masks[bits]++;
10165         if (mtab->imt6_masks[bits] > 1)
10166                 return;
10167
10168         if (bits == 0) {
10169                 mask = &zero;
10170                 zero.i6[0] = 0;
10171                 zero.i6[1] = 0;
10172                 zero.i6[2] = 0;
10173                 zero.i6[3] = 0;
10174         }
10175
10176         for (i = 0; i < 129; i++) {
10177                 if (IP6_LT(&mtab->imt6_active[i], mask)) {
10178                         for (j = 128; j > i; j--)
10179                                 mtab->imt6_active[j] = mtab->imt6_active[j - 1];
10180                         mtab->imt6_active[i] = *mask;
10181                         break;
10182                 }
10183         }
10184         mtab->imt6_max++;
10185 }
10186
10187
10188 /* ------------------------------------------------------------------------ */
10189 /* Function:    ipf_inet6_mask_del                                          */
10190 /* Returns:     Nil                                                         */
10191 /* Parameters:  bits(I) - number of bits set in mask                        */
10192 /*              mask(I) - pointer to mask to remove                         */
10193 /*              mtab(I) - pointer to mask hash table structure              */
10194 /*                                                                          */
10195 /* Remove the 128bit bitmask represented by "bits" from the collection of   */
10196 /* netmasks stored inside of mtab.                                          */
10197 /* ------------------------------------------------------------------------ */
10198 void
10199 ipf_inet6_mask_del(bits, mask, mtab)
10200         int bits;
10201         i6addr_t *mask;
10202         ipf_v6_masktab_t *mtab;
10203 {
10204         i6addr_t zero;
10205         int i, j;
10206
10207         mtab->imt6_masks[bits]--;
10208         if (mtab->imt6_masks[bits] > 0)
10209                 return;
10210
10211         if (bits == 0)
10212                 mask = &zero;
10213         zero.i6[0] = 0;
10214         zero.i6[1] = 0;
10215         zero.i6[2] = 0;
10216         zero.i6[3] = 0;
10217
10218         for (i = 0; i < 129; i++) {
10219                 if (IP6_EQ(&mtab->imt6_active[i], mask)) {
10220                         for (j = i + 1; j < 129; j++) {
10221                                 mtab->imt6_active[j - 1] = mtab->imt6_active[j];
10222                                 if (IP6_EQ(&mtab->imt6_active[j - 1], &zero))
10223                                         break;
10224                         }
10225                         break;
10226                 }
10227         }
10228         mtab->imt6_max--;
10229         ASSERT(mtab->imt6_max >= 0);
10230 }
10231 #endif