sys/net/pf/pf.c

   1 /*      $FreeBSD: src/sys/contrib/pf/net/pf.c,v 1.19 2004/09/11 11:18:25 mlaier Exp $   */
   2 /*      $OpenBSD: pf.c,v 1.433.2.2 2004/07/17 03:22:34 brad Exp $ */
   3 /* add  $OpenBSD: pf.c,v 1.448 2004/05/11 07:34:11 dhartmei Exp $ */
   4 /*      $DragonFly: src/sys/net/pf/pf.c,v 1.19 2008/05/14 11:59:23 sephe Exp $ */
   5
   6 /*
   7  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
   8  *
   9  * Copyright (c) 2001 Daniel Hartmeier
  10  * Copyright (c) 2002,2003 Henning Brauer
  11  * All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  *
  17  *    - Redistributions of source code must retain the above copyright
  18  *      notice, this list of conditions and the following disclaimer.
  19  *    - Redistributions in binary form must reproduce the above
  20  *      copyright notice, this list of conditions and the following
  21  *      disclaimer in the documentation and/or other materials provided
  22  *      with the distribution.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  27  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  28  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  30  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  31  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  32  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  34  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Effort sponsored in part by the Defense Advanced Research Projects
  38  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  39  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  40  *
  41  */
  42
  43 #include "opt_inet.h"
  44 #include "opt_inet6.h"
  45 #include "use_pfsync.h"
  46
  47 #include <sys/param.h>
  48 #include <sys/systm.h>
  49 #include <sys/malloc.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/filio.h>
  52 #include <sys/socket.h>
  53 #include <sys/socketvar.h>
  54 #include <sys/kernel.h>
  55 #include <sys/time.h>
  56 #include <sys/sysctl.h>
  57 #include <sys/endian.h>
  58 #include <vm/vm_zone.h>
  59
  60 #include <machine/inttypes.h>
  61
  62 #include <net/if.h>
  63 #include <net/if_types.h>
  64 #include <net/bpf.h>
  65 #include <net/netisr.h>
  66 #include <net/route.h>
  67
  68 #include <netinet/in.h>
  69 #include <netinet/in_var.h>
  70 #include <netinet/in_systm.h>
  71 #include <netinet/ip.h>
  72 #include <netinet/ip_var.h>
  73 #include <netinet/tcp.h>
  74 #include <netinet/tcp_seq.h>
  75 #include <netinet/udp.h>
  76 #include <netinet/ip_icmp.h>
  77 #include <netinet/in_pcb.h>
  78 #include <netinet/tcp_timer.h>
  79 #include <netinet/tcp_var.h>
  80 #include <netinet/udp_var.h>
  81 #include <netinet/icmp_var.h>
  82
  83 #include <net/pf/pfvar.h>
  84 #include <net/pf/if_pflog.h>
  85
  86 #if NPFSYNC > 0
  87 #include <net/pf/if_pfsync.h>
  88 #endif /* NPFSYNC > 0 */
  89
  90 #ifdef INET6
  91 #include <netinet/ip6.h>
  92 #include <netinet/in_pcb.h>
  93 #include <netinet/icmp6.h>
  94 #include <netinet6/nd6.h>
  95 #include <netinet6/ip6_var.h>
  96 #include <netinet6/in6_pcb.h>
  97 #endif /* INET6 */
  98
  99 #include <sys/in_cksum.h>
 100 #include <sys/ucred.h>
 101 #include <machine/limits.h>
 102 #include <sys/msgport2.h>
 103 #include <net/netmsg2.h>
 104
 105 extern int ip_optcopy(struct ip *, struct ip *);
 106
 107 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
 108
 109 /*
 110  * Global variables
 111  */
 112
 113 struct pf_anchorqueue    pf_anchors;
 114 struct pf_ruleset        pf_main_ruleset;
 115 struct pf_altqqueue      pf_altqs[2];
 116 struct pf_palist         pf_pabuf;
 117 struct pf_altqqueue     *pf_altqs_active;
 118 struct pf_altqqueue     *pf_altqs_inactive;
 119 struct pf_status         pf_status;
 120
 121 u_int32_t                ticket_altqs_active;
 122 u_int32_t                ticket_altqs_inactive;
 123 int                      altqs_inactive_open;
 124 u_int32_t                ticket_pabuf;
 125
 126 struct callout           pf_expire_to;                  /* expire timeout */
 127
 128 vm_zone_t                pf_src_tree_pl, pf_rule_pl;
 129 vm_zone_t                pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
 130
 131 void                     pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
 132 void                     pf_print_state(struct pf_state *);
 133 void                     pf_print_flags(u_int8_t);
 134
 135 u_int16_t                pf_cksum_fixup(u_int16_t, u_int16_t, u_int16_t,
 136                             u_int8_t);
 137 void                     pf_change_ap(struct pf_addr *, u_int16_t *,
 138                             u_int16_t *, u_int16_t *, struct pf_addr *,
 139                             u_int16_t, u_int8_t, sa_family_t);
 140 #ifdef INET6
 141 void                     pf_change_a6(struct pf_addr *, u_int16_t *,
 142                             struct pf_addr *, u_int8_t);
 143 #endif /* INET6 */
 144 void                     pf_change_icmp(struct pf_addr *, u_int16_t *,
 145                             struct pf_addr *, struct pf_addr *, u_int16_t,
 146                             u_int16_t *, u_int16_t *, u_int16_t *,
 147                             u_int16_t *, u_int8_t, sa_family_t);
 148 void                     pf_send_tcp(const struct pf_rule *, sa_family_t,
 149                             const struct pf_addr *, const struct pf_addr *,
 150                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 151                             u_int8_t, u_int16_t, u_int16_t, u_int8_t);
 152 void                     pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 153                             sa_family_t, struct pf_rule *);
 154 struct pf_rule          *pf_match_translation(struct pf_pdesc *, struct mbuf *,
 155                             int, int, struct pfi_kif *,
 156                             struct pf_addr *, u_int16_t, struct pf_addr *,
 157                             u_int16_t, int);
 158 struct pf_rule          *pf_get_translation(struct pf_pdesc *, struct mbuf *,
 159                             int, int, struct pfi_kif *, struct pf_src_node **,
 160                             struct pf_addr *, u_int16_t,
 161                             struct pf_addr *, u_int16_t,
 162                             struct pf_addr *, u_int16_t *);
 163 int                      pf_test_tcp(struct pf_rule **, struct pf_state **,
 164                             int, struct pfi_kif *, struct mbuf *, int,
 165                             void *, struct pf_pdesc *, struct pf_rule **,
 166                             struct pf_ruleset **);
 167 int                      pf_test_udp(struct pf_rule **, struct pf_state **,
 168                             int, struct pfi_kif *, struct mbuf *, int,
 169                             void *, struct pf_pdesc *, struct pf_rule **,
 170                             struct pf_ruleset **);
 171 int                      pf_test_icmp(struct pf_rule **, struct pf_state **,
 172                             int, struct pfi_kif *, struct mbuf *, int,
 173                             void *, struct pf_pdesc *, struct pf_rule **,
 174                             struct pf_ruleset **);
 175 int                      pf_test_other(struct pf_rule **, struct pf_state **,
 176                             int, struct pfi_kif *, struct mbuf *, int, void *,
 177                             struct pf_pdesc *, struct pf_rule **,
 178                             struct pf_ruleset **);
 179 int                      pf_test_fragment(struct pf_rule **, int,
 180                             struct pfi_kif *, struct mbuf *, void *,
 181                             struct pf_pdesc *, struct pf_rule **,
 182                             struct pf_ruleset **);
 183 int                      pf_test_state_tcp(struct pf_state **, int,
 184                             struct pfi_kif *, struct mbuf *, int,
 185                             void *, struct pf_pdesc *, u_short *);
 186 int                      pf_test_state_udp(struct pf_state **, int,
 187                             struct pfi_kif *, struct mbuf *, int,
 188                             void *, struct pf_pdesc *);
 189 int                      pf_test_state_icmp(struct pf_state **, int,
 190                             struct pfi_kif *, struct mbuf *, int,
 191                             void *, struct pf_pdesc *);
 192 int                      pf_test_state_other(struct pf_state **, int,
 193                             struct pfi_kif *, struct pf_pdesc *);
 194 static int               pf_match_tag(struct mbuf *, struct pf_rule *,
 195                                       struct pf_rule *, int *);
 196 void                     pf_hash(struct pf_addr *, struct pf_addr *,
 197                             struct pf_poolhashkey *, sa_family_t);
 198 int                      pf_map_addr(u_int8_t, struct pf_rule *,
 199                             struct pf_addr *, struct pf_addr *,
 200                             struct pf_addr *, struct pf_src_node **);
 201 int                      pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
 202                             struct pf_addr *, struct pf_addr *, u_int16_t,
 203                             struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
 204                             struct pf_src_node **);
 205 void                     pf_route(struct mbuf **, struct pf_rule *, int,
 206                             struct ifnet *, struct pf_state *);
 207 void                     pf_route6(struct mbuf **, struct pf_rule *, int,
 208                             struct ifnet *, struct pf_state *);
 209 int                      pf_socket_lookup(uid_t *, gid_t *,
 210                             int, struct pf_pdesc *);
 211 u_int8_t                 pf_get_wscale(struct mbuf *, int, u_int16_t,
 212                             sa_family_t);
 213 u_int16_t                pf_get_mss(struct mbuf *, int, u_int16_t,
 214                             sa_family_t);
 215 u_int16_t                pf_calc_mss(struct pf_addr *, sa_family_t,
 216                                 u_int16_t);
 217 void                     pf_set_rt_ifp(struct pf_state *,
 218                             struct pf_addr *);
 219 int                      pf_check_proto_cksum(struct mbuf *, int, int,
 220                             u_int8_t, sa_family_t);
 221 int                      pf_addr_wrap_neq(struct pf_addr_wrap *,
 222                             struct pf_addr_wrap *);
 223 struct pf_state         *pf_find_state_recurse(struct pfi_kif *,
 224                             struct pf_state *, u_int8_t);
 225
 226 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX];
 227
 228 #define STATE_LOOKUP()                                                  \
 229         do {                                                            \
 230                 if (direction == PF_IN)                                 \
 231                         *state = pf_find_state_recurse(         \
 232                             kif, &key, PF_EXT_GWY);                     \
 233                 else                                                    \
 234                         *state = pf_find_state_recurse(         \
 235                             kif, &key, PF_LAN_EXT);                     \
 236                 if (*state == NULL)                                     \
 237                         return (PF_DROP);                               \
 238                 if (direction == PF_OUT &&                              \
 239                     (((*state)->rule.ptr->rt == PF_ROUTETO &&           \
 240                     (*state)->rule.ptr->direction == PF_OUT) ||         \
 241                     ((*state)->rule.ptr->rt == PF_REPLYTO &&            \
 242                     (*state)->rule.ptr->direction == PF_IN)) &&         \
 243                     (*state)->rt_kif != NULL &&                         \
 244                     (*state)->rt_kif != kif)                            \
 245                         return (PF_PASS);                               \
 246         } while (0)
 247
 248 #define STATE_TRANSLATE(s) \
 249         (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \
 250         ((s)->af == AF_INET6 && \
 251         ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \
 252         (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \
 253         (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \
 254         (s)->lan.port != (s)->gwy.port
 255
 256 #define BOUND_IFACE(r, k) (((r)->rule_flag & PFRULE_IFBOUND) ? (k) :   \
 257         ((r)->rule_flag & PFRULE_GRBOUND) ? (k)->pfik_parent :         \
 258         (k)->pfik_parent->pfik_parent)
 259
 260 static int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
 261 static int pf_state_compare_lan_ext(struct pf_state *,
 262         struct pf_state *);
 263 static int pf_state_compare_ext_gwy(struct pf_state *,
 264         struct pf_state *);
 265 static int pf_state_compare_id(struct pf_state *,
 266         struct pf_state *);
 267
 268 struct pf_src_tree tree_src_tracking;
 269
 270 struct pf_state_tree_id tree_id;
 271 struct pf_state_queue state_updates;
 272
 273 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
 274 RB_GENERATE(pf_state_tree_lan_ext, pf_state,
 275     u.s.entry_lan_ext, pf_state_compare_lan_ext);
 276 RB_GENERATE(pf_state_tree_ext_gwy, pf_state,
 277     u.s.entry_ext_gwy, pf_state_compare_ext_gwy);
 278 RB_GENERATE(pf_state_tree_id, pf_state,
 279     u.s.entry_id, pf_state_compare_id);
 280
 281 static int
 282 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
 283 {
 284         int     diff;
 285
 286         if (a->rule.ptr > b->rule.ptr)
 287                 return (1);
 288         if (a->rule.ptr < b->rule.ptr)
 289                 return (-1);
 290         if ((diff = a->af - b->af) != 0)
 291                 return (diff);
 292         switch (a->af) {
 293 #ifdef INET
 294         case AF_INET:
 295                 if (a->addr.addr32[0] > b->addr.addr32[0])
 296                         return (1);
 297                 if (a->addr.addr32[0] < b->addr.addr32[0])
 298                         return (-1);
 299                 break;
 300 #endif /* INET */
 301 #ifdef INET6
 302         case AF_INET6:
 303                 if (a->addr.addr32[3] > b->addr.addr32[3])
 304                         return (1);
 305                 if (a->addr.addr32[3] < b->addr.addr32[3])
 306                         return (-1);
 307                 if (a->addr.addr32[2] > b->addr.addr32[2])
 308                         return (1);
 309                 if (a->addr.addr32[2] < b->addr.addr32[2])
 310                         return (-1);
 311                 if (a->addr.addr32[1] > b->addr.addr32[1])
 312                         return (1);
 313                 if (a->addr.addr32[1] < b->addr.addr32[1])
 314                         return (-1);
 315                 if (a->addr.addr32[0] > b->addr.addr32[0])
 316                         return (1);
 317                 if (a->addr.addr32[0] < b->addr.addr32[0])
 318                         return (-1);
 319                 break;
 320 #endif /* INET6 */
 321         }
 322         return (0);
 323 }
 324
 325 u_int32_t
 326 pf_state_hash(struct pf_state *s)
 327 {
 328         u_int32_t hv = (intptr_t)s / sizeof(*s);
 329
 330         hv ^= crc32(&s->lan, sizeof(s->lan));
 331         hv ^= crc32(&s->gwy, sizeof(s->gwy));
 332         hv ^= crc32(&s->ext, sizeof(s->ext));
 333         if (hv == 0)    /* disallow 0 */
 334                 hv = 1;
 335         return(hv);
 336 }
 337
 338 static int
 339 pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b)
 340 {
 341         int     diff;
 342
 343         if ((diff = a->proto - b->proto) != 0)
 344                 return (diff);
 345         if ((diff = a->af - b->af) != 0)
 346                 return (diff);
 347         switch (a->af) {
 348 #ifdef INET
 349         case AF_INET:
 350                 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
 351                         return (1);
 352                 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
 353                         return (-1);
 354                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 355                         return (1);
 356                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 357                         return (-1);
 358                 break;
 359 #endif /* INET */
 360 #ifdef INET6
 361         case AF_INET6:
 362                 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
 363                         return (1);
 364                 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
 365                         return (-1);
 366                 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
 367                         return (1);
 368                 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
 369                         return (-1);
 370                 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
 371                         return (1);
 372                 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
 373                         return (-1);
 374                 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
 375                         return (1);
 376                 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
 377                         return (-1);
 378                 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
 379                         return (1);
 380                 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
 381                         return (-1);
 382                 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
 383                         return (1);
 384                 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
 385                         return (-1);
 386                 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
 387                         return (1);
 388                 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
 389                         return (-1);
 390                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 391                         return (1);
 392                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 393                         return (-1);
 394                 break;
 395 #endif /* INET6 */
 396         }
 397
 398         if ((diff = a->lan.port - b->lan.port) != 0)
 399                 return (diff);
 400         if ((diff = a->ext.port - b->ext.port) != 0)
 401                 return (diff);
 402
 403         return (0);
 404 }
 405
 406 static int
 407 pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b)
 408 {
 409         int     diff;
 410
 411         if ((diff = a->proto - b->proto) != 0)
 412                 return (diff);
 413         if ((diff = a->af - b->af) != 0)
 414                 return (diff);
 415         switch (a->af) {
 416 #ifdef INET
 417         case AF_INET:
 418                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 419                         return (1);
 420                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 421                         return (-1);
 422                 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
 423                         return (1);
 424                 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
 425                         return (-1);
 426                 break;
 427 #endif /* INET */
 428 #ifdef INET6
 429         case AF_INET6:
 430                 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
 431                         return (1);
 432                 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
 433                         return (-1);
 434                 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
 435                         return (1);
 436                 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
 437                         return (-1);
 438                 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
 439                         return (1);
 440                 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
 441                         return (-1);
 442                 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
 443                         return (1);
 444                 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
 445                         return (-1);
 446                 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
 447                         return (1);
 448                 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
 449                         return (-1);
 450                 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
 451                         return (1);
 452                 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
 453                         return (-1);
 454                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 455                         return (1);
 456                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 457                         return (-1);
 458                 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
 459                         return (1);
 460                 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
 461                         return (-1);
 462                 break;
 463 #endif /* INET6 */
 464         }
 465
 466         if ((diff = a->ext.port - b->ext.port) != 0)
 467                 return (diff);
 468         if ((diff = a->gwy.port - b->gwy.port) != 0)
 469                 return (diff);
 470
 471         return (0);
 472 }
 473
 474 static int
 475 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
 476 {
 477         if (a->id > b->id)
 478                 return (1);
 479         if (a->id < b->id)
 480                 return (-1);
 481         if (a->creatorid > b->creatorid)
 482                 return (1);
 483         if (a->creatorid < b->creatorid)
 484                 return (-1);
 485
 486         return (0);
 487 }
 488
 489 #ifdef INET6
 490 void
 491 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 492 {
 493         switch (af) {
 494 #ifdef INET
 495         case AF_INET:
 496                 dst->addr32[0] = src->addr32[0];
 497                 break;
 498 #endif /* INET */
 499         case AF_INET6:
 500                 dst->addr32[0] = src->addr32[0];
 501                 dst->addr32[1] = src->addr32[1];
 502                 dst->addr32[2] = src->addr32[2];
 503                 dst->addr32[3] = src->addr32[3];
 504                 break;
 505         }
 506 }
 507 #endif
 508
 509 struct pf_state *
 510 pf_find_state_byid(struct pf_state *key)
 511 {
 512         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 513         return (RB_FIND(pf_state_tree_id, &tree_id, key));
 514 }
 515
 516 struct pf_state *
 517 pf_find_state_recurse(struct pfi_kif *kif, struct pf_state *key, u_int8_t tree)
 518 {
 519         struct pf_state *s;
 520
 521         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 522
 523         switch (tree) {
 524         case PF_LAN_EXT:
 525                 for (; kif != NULL; kif = kif->pfik_parent) {
 526                         s = RB_FIND(pf_state_tree_lan_ext,
 527                             &kif->pfik_lan_ext, key);
 528                         if (s != NULL)
 529                                 return (s);
 530                 }
 531                 return (NULL);
 532         case PF_EXT_GWY:
 533                 for (; kif != NULL; kif = kif->pfik_parent) {
 534                         s = RB_FIND(pf_state_tree_ext_gwy,
 535                             &kif->pfik_ext_gwy, key);
 536                         if (s != NULL)
 537                                 return (s);
 538                 }
 539                 return (NULL);
 540         default:
 541                 panic("pf_find_state_recurse");
 542         }
 543 }
 544
 545 struct pf_state *
 546 pf_find_state_all(struct pf_state *key, u_int8_t tree, int *more)
 547 {
 548         struct pf_state *s, *ss = NULL;
 549         struct pfi_kif  *kif;
 550
 551         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 552
 553         switch (tree) {
 554         case PF_LAN_EXT:
 555                 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
 556                         s = RB_FIND(pf_state_tree_lan_ext,
 557                             &kif->pfik_lan_ext, key);
 558                         if (s == NULL)
 559                                 continue;
 560                         if (more == NULL)
 561                                 return (s);
 562                         ss = s;
 563                         (*more)++;
 564                 }
 565                 return (ss);
 566         case PF_EXT_GWY:
 567                 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
 568                         s = RB_FIND(pf_state_tree_ext_gwy,
 569                             &kif->pfik_ext_gwy, key);
 570                         if (s == NULL)
 571                                 continue;
 572                         if (more == NULL)
 573                                 return (s);
 574                         ss = s;
 575                         (*more)++;
 576                 }
 577                 return (ss);
 578         default:
 579                 panic("pf_find_state_all");
 580         }
 581 }
 582
 583 int
 584 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 585     struct pf_addr *src, sa_family_t af)
 586 {
 587         struct pf_src_node      k;
 588
 589         if (*sn == NULL) {
 590                 k.af = af;
 591                 PF_ACPY(&k.addr, src, af);
 592                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 593                     rule->rpool.opts & PF_POOL_STICKYADDR)
 594                         k.rule.ptr = rule;
 595                 else
 596                         k.rule.ptr = NULL;
 597                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
 598                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
 599         }
 600         if (*sn == NULL) {
 601                 if (!rule->max_src_nodes ||
 602                     rule->src_nodes < rule->max_src_nodes)
 603                         (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT);
 604                 if ((*sn) == NULL)
 605                         return (-1);
 606                 bzero(*sn, sizeof(struct pf_src_node));
 607                 (*sn)->af = af;
 608                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 609                     rule->rpool.opts & PF_POOL_STICKYADDR)
 610                         (*sn)->rule.ptr = rule;
 611                 else
 612                         (*sn)->rule.ptr = NULL;
 613                 PF_ACPY(&(*sn)->addr, src, af);
 614                 if (RB_INSERT(pf_src_tree,
 615                     &tree_src_tracking, *sn) != NULL) {
 616                         if (pf_status.debug >= PF_DEBUG_MISC) {
 617                                 kprintf("pf: src_tree insert failed: ");
 618                                 pf_print_host(&(*sn)->addr, 0, af);
 619                                 kprintf("\n");
 620                         }
 621                         pool_put(&pf_src_tree_pl, *sn);
 622                         return (-1);
 623                 }
 624                 (*sn)->creation = time_second;
 625                 (*sn)->ruletype = rule->action;
 626                 if ((*sn)->rule.ptr != NULL)
 627                         (*sn)->rule.ptr->src_nodes++;
 628                 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
 629                 pf_status.src_nodes++;
 630         } else {
 631                 if (rule->max_src_states &&
 632                     (*sn)->states >= rule->max_src_states)
 633                         return (-1);
 634         }
 635         return (0);
 636 }
 637
 638 int
 639 pf_insert_state(struct pfi_kif *kif, struct pf_state *state)
 640 {
 641         /* Thou MUST NOT insert multiple duplicate keys */
 642         state->u.s.kif = kif;
 643         if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) {
 644                 if (pf_status.debug >= PF_DEBUG_MISC) {
 645                         kprintf("pf: state insert failed: tree_lan_ext");
 646                         kprintf(" lan: ");
 647                         pf_print_host(&state->lan.addr, state->lan.port,
 648                             state->af);
 649                         kprintf(" gwy: ");
 650                         pf_print_host(&state->gwy.addr, state->gwy.port,
 651                             state->af);
 652                         kprintf(" ext: ");
 653                         pf_print_host(&state->ext.addr, state->ext.port,
 654                             state->af);
 655                         if (state->sync_flags & PFSTATE_FROMSYNC)
 656                                 kprintf(" (from sync)");
 657                         kprintf("\n");
 658                 }
 659                 return (-1);
 660         }
 661
 662         if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) {
 663                 if (pf_status.debug >= PF_DEBUG_MISC) {
 664                         kprintf("pf: state insert failed: tree_ext_gwy");
 665                         kprintf(" lan: ");
 666                         pf_print_host(&state->lan.addr, state->lan.port,
 667                             state->af);
 668                         kprintf(" gwy: ");
 669                         pf_print_host(&state->gwy.addr, state->gwy.port,
 670                             state->af);
 671                         kprintf(" ext: ");
 672                         pf_print_host(&state->ext.addr, state->ext.port,
 673                             state->af);
 674                         if (state->sync_flags & PFSTATE_FROMSYNC)
 675                                 kprintf(" (from sync)");
 676                         kprintf("\n");
 677                 }
 678                 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
 679                 return (-1);
 680         }
 681
 682         if (state->id == 0 && state->creatorid == 0) {
 683                 state->id = htobe64(pf_status.stateid++);
 684                 state->creatorid = pf_status.hostid;
 685         }
 686         if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) {
 687                 if (pf_status.debug >= PF_DEBUG_MISC) {
 688                         kprintf("pf: state insert failed: "
 689                             "id: %016" PRIx64 " creatorid: %08" PRIx32,
 690                             be64toh(state->id), ntohl(state->creatorid));
 691                         if (state->sync_flags & PFSTATE_FROMSYNC)
 692                                 kprintf(" (from sync)");
 693                         kprintf("\n");
 694                 }
 695                 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
 696                 RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state);
 697                 return (-1);
 698         }
 699         TAILQ_INSERT_HEAD(&state_updates, state, u.s.entry_updates);
 700
 701         pf_status.fcounters[FCNT_STATE_INSERT]++;
 702         pf_status.states++;
 703         pfi_attach_state(kif);
 704 #if NPFSYNC
 705         pfsync_insert_state(state);
 706 #endif
 707         return (0);
 708 }
 709
 710 void
 711 pf_purge_timeout(void *arg)
 712 {
 713         struct callout  *to = arg;
 714
 715         crit_enter();
 716         pf_purge_expired_states();
 717         pf_purge_expired_fragments();
 718         pf_purge_expired_src_nodes();
 719         crit_exit();
 720
 721         callout_reset(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz,
 722             pf_purge_timeout, to);
 723 }
 724
 725 u_int32_t
 726 pf_state_expires(const struct pf_state *state)
 727 {
 728         u_int32_t       timeout;
 729         u_int32_t       start;
 730         u_int32_t       end;
 731         u_int32_t       states;
 732
 733         /* handle all PFTM_* > PFTM_MAX here */
 734         if (state->timeout == PFTM_PURGE)
 735                 return (time_second);
 736         if (state->timeout == PFTM_UNTIL_PACKET)
 737                 return (0);
 738         KASSERT((state->timeout < PFTM_MAX),
 739             ("pf_state_expires: timeout > PFTM_MAX"));
 740         timeout = state->rule.ptr->timeout[state->timeout];
 741         if (!timeout)
 742                 timeout = pf_default_rule.timeout[state->timeout];
 743         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
 744         if (start) {
 745                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
 746                 states = state->rule.ptr->states;
 747         } else {
 748                 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
 749                 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
 750                 states = pf_status.states;
 751         }
 752         if (end && states > start && start < end) {
 753                 if (states < end)
 754                         return (state->expire + timeout * (end - states) /
 755                             (end - start));
 756                 else
 757                         return (time_second);
 758         }
 759         return (state->expire + timeout);
 760 }
 761
 762 void
 763 pf_purge_expired_src_nodes(void)
 764 {
 765          struct pf_src_node             *cur, *next;
 766
 767          for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
 768                  next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
 769
 770                  if (cur->states <= 0 && cur->expire <= time_second) {
 771                          if (cur->rule.ptr != NULL) {
 772                                  cur->rule.ptr->src_nodes--;
 773                                  if (cur->rule.ptr->states <= 0 &&
 774                                      cur->rule.ptr->max_src_nodes <= 0)
 775                                          pf_rm_rule(NULL, cur->rule.ptr);
 776                          }
 777                          RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
 778                          pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
 779                          pf_status.src_nodes--;
 780                          pool_put(&pf_src_tree_pl, cur);
 781                  }
 782          }
 783 }
 784
 785 void
 786 pf_src_tree_remove_state(struct pf_state *s)
 787 {
 788         u_int32_t timeout;
 789
 790         if (s->src_node != NULL) {
 791                 if (--s->src_node->states <= 0) {
 792                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
 793                         if (!timeout)
 794                                 timeout =
 795                                     pf_default_rule.timeout[PFTM_SRC_NODE];
 796                         s->src_node->expire = time_second + timeout;
 797                 }
 798         }
 799         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
 800                 if (--s->nat_src_node->states <= 0) {
 801                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
 802                         if (!timeout)
 803                                 timeout =
 804                                     pf_default_rule.timeout[PFTM_SRC_NODE];
 805                         s->nat_src_node->expire = time_second + timeout;
 806                 }
 807         }
 808         s->src_node = s->nat_src_node = NULL;
 809 }
 810
 811 static int
 812 pf_purge_expired_states_callback(struct pf_state *cur, void *data __unused)
 813 {
 814         if (pf_state_expires(cur) <= time_second) {
 815                 RB_REMOVE(pf_state_tree_ext_gwy,
 816                     &cur->u.s.kif->pfik_ext_gwy, cur);
 817                 RB_REMOVE(pf_state_tree_lan_ext,
 818                     &cur->u.s.kif->pfik_lan_ext, cur);
 819                 RB_REMOVE(pf_state_tree_id, &tree_id, cur);
 820                 if (cur->src.state == PF_TCPS_PROXY_DST) {
 821                         pf_send_tcp(cur->rule.ptr, cur->af,
 822                             &cur->ext.addr, &cur->lan.addr,
 823                             cur->ext.port, cur->lan.port,
 824                             cur->src.seqhi, cur->src.seqlo + 1, 0,
 825                             TH_RST|TH_ACK, 0, 0);
 826                 }
 827 #if NPFSYNC
 828                 pfsync_delete_state(cur);
 829 #endif
 830                 pf_src_tree_remove_state(cur);
 831                 if (--cur->rule.ptr->states <= 0 &&
 832                     cur->rule.ptr->src_nodes <= 0)
 833                         pf_rm_rule(NULL, cur->rule.ptr);
 834                 if (cur->nat_rule.ptr != NULL)
 835                         if (--cur->nat_rule.ptr->states <= 0 &&
 836                                 cur->nat_rule.ptr->src_nodes <= 0)
 837                                 pf_rm_rule(NULL, cur->nat_rule.ptr);
 838                 if (cur->anchor.ptr != NULL)
 839                         if (--cur->anchor.ptr->states <= 0)
 840                                 pf_rm_rule(NULL, cur->anchor.ptr);
 841                 pf_normalize_tcp_cleanup(cur);
 842                 pfi_detach_state(cur->u.s.kif);
 843                 TAILQ_REMOVE(&state_updates, cur, u.s.entry_updates);
 844                 pool_put(&pf_state_pl, cur);
 845                 pf_status.fcounters[FCNT_STATE_REMOVALS]++;
 846                 pf_status.states--;
 847         }
 848         return(0);
 849 }
 850
 851 void
 852 pf_purge_expired_states(void)
 853 {
 854         RB_SCAN(pf_state_tree_id, &tree_id, NULL,
 855                 pf_purge_expired_states_callback, NULL);
 856 }
 857
 858
 859 int
 860 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
 861 {
 862         if (aw->type != PF_ADDR_TABLE)
 863                 return (0);
 864         if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
 865                 return (1);
 866         return (0);
 867 }
 868
 869 void
 870 pf_tbladdr_remove(struct pf_addr_wrap *aw)
 871 {
 872         if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
 873                 return;
 874         pfr_detach_table(aw->p.tbl);
 875         aw->p.tbl = NULL;
 876 }
 877
 878 void
 879 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
 880 {
 881         struct pfr_ktable *kt = aw->p.tbl;
 882
 883         if (aw->type != PF_ADDR_TABLE || kt == NULL)
 884                 return;
 885         if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
 886                 kt = kt->pfrkt_root;
 887         aw->p.tbl = NULL;
 888         aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
 889                 kt->pfrkt_cnt : -1;
 890 }
 891
 892 void
 893 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
 894 {
 895         switch (af) {
 896 #ifdef INET
 897         case AF_INET: {
 898                 u_int32_t a = ntohl(addr->addr32[0]);
 899                 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
 900                     (a>>8)&255, a&255);
 901                 if (p) {
 902                         p = ntohs(p);
 903                         kprintf(":%u", p);
 904                 }
 905                 break;
 906         }
 907 #endif /* INET */
 908 #ifdef INET6
 909         case AF_INET6: {
 910                 u_int16_t b;
 911                 u_int8_t i, curstart = 255, curend = 0,
 912                     maxstart = 0, maxend = 0;
 913                 for (i = 0; i < 8; i++) {
 914                         if (!addr->addr16[i]) {
 915                                 if (curstart == 255)
 916                                         curstart = i;
 917                                 else
 918                                         curend = i;
 919                         } else {
 920                                 if (curstart) {
 921                                         if ((curend - curstart) >
 922                                             (maxend - maxstart)) {
 923                                                 maxstart = curstart;
 924                                                 maxend = curend;
 925                                                 curstart = 255;
 926                                         }
 927                                 }
 928                         }
 929                 }
 930                 for (i = 0; i < 8; i++) {
 931                         if (i >= maxstart && i <= maxend) {
 932                                 if (maxend != 7) {
 933                                         if (i == maxstart)
 934                                                 kprintf(":");
 935                                 } else {
 936                                         if (i == maxend)
 937                                                 kprintf(":");
 938                                 }
 939                         } else {
 940                                 b = ntohs(addr->addr16[i]);
 941                                 kprintf("%x", b);
 942                                 if (i < 7)
 943                                         kprintf(":");
 944                         }
 945                 }
 946                 if (p) {
 947                         p = ntohs(p);
 948                         kprintf("[%u]", p);
 949                 }
 950                 break;
 951         }
 952 #endif /* INET6 */
 953         }
 954 }
 955
 956 void
 957 pf_print_state(struct pf_state *s)
 958 {
 959         switch (s->proto) {
 960         case IPPROTO_TCP:
 961                 kprintf("TCP ");
 962                 break;
 963         case IPPROTO_UDP:
 964                 kprintf("UDP ");
 965                 break;
 966         case IPPROTO_ICMP:
 967                 kprintf("ICMP ");
 968                 break;
 969         case IPPROTO_ICMPV6:
 970                 kprintf("ICMPV6 ");
 971                 break;
 972         default:
 973                 kprintf("%u ", s->proto);
 974                 break;
 975         }
 976         pf_print_host(&s->lan.addr, s->lan.port, s->af);
 977         kprintf(" ");
 978         pf_print_host(&s->gwy.addr, s->gwy.port, s->af);
 979         kprintf(" ");
 980         pf_print_host(&s->ext.addr, s->ext.port, s->af);
 981         kprintf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
 982             s->src.seqhi, s->src.max_win, s->src.seqdiff);
 983         if (s->src.wscale && s->dst.wscale)
 984                 kprintf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
 985         kprintf("]");
 986         kprintf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
 987             s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
 988         if (s->src.wscale && s->dst.wscale)
 989                 kprintf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
 990         kprintf("]");
 991         kprintf(" %u:%u", s->src.state, s->dst.state);
 992 }
 993
 994 void
 995 pf_print_flags(u_int8_t f)
 996 {
 997         if (f)
 998                 kprintf(" ");
 999         if (f & TH_FIN)
1000                 kprintf("F");
1001         if (f & TH_SYN)
1002                 kprintf("S");
1003         if (f & TH_RST)
1004                 kprintf("R");
1005         if (f & TH_PUSH)
1006                 kprintf("P");
1007         if (f & TH_ACK)
1008                 kprintf("A");
1009         if (f & TH_URG)
1010                 kprintf("U");
1011         if (f & TH_ECE)
1012                 kprintf("E");
1013         if (f & TH_CWR)
1014                 kprintf("W");
1015 }
1016
1017 #define PF_SET_SKIP_STEPS(i)                                    \
1018         do {                                                    \
1019                 while (head[i] != cur) {                        \
1020                         head[i]->skip[i].ptr = cur;             \
1021                         head[i] = TAILQ_NEXT(head[i], entries); \
1022                 }                                               \
1023         } while (0)
1024
1025 void
1026 pf_calc_skip_steps(struct pf_rulequeue *rules)
1027 {
1028         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1029         int i;
1030
1031         cur = TAILQ_FIRST(rules);
1032         prev = cur;
1033         for (i = 0; i < PF_SKIP_COUNT; ++i)
1034                 head[i] = cur;
1035         while (cur != NULL) {
1036
1037                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1038                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1039                 if (cur->direction != prev->direction)
1040                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1041                 if (cur->af != prev->af)
1042                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
1043                 if (cur->proto != prev->proto)
1044                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1045                 if (cur->src.not != prev->src.not ||
1046                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1047                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1048                 if (cur->src.port[0] != prev->src.port[0] ||
1049                     cur->src.port[1] != prev->src.port[1] ||
1050                     cur->src.port_op != prev->src.port_op)
1051                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1052                 if (cur->dst.not != prev->dst.not ||
1053                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1054                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1055                 if (cur->dst.port[0] != prev->dst.port[0] ||
1056                     cur->dst.port[1] != prev->dst.port[1] ||
1057                     cur->dst.port_op != prev->dst.port_op)
1058                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1059
1060                 prev = cur;
1061                 cur = TAILQ_NEXT(cur, entries);
1062         }
1063         for (i = 0; i < PF_SKIP_COUNT; ++i)
1064                 PF_SET_SKIP_STEPS(i);
1065 }
1066
1067 int
1068 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1069 {
1070         if (aw1->type != aw2->type)
1071                 return (1);
1072         switch (aw1->type) {
1073         case PF_ADDR_ADDRMASK:
1074                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1075                         return (1);
1076                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1077                         return (1);
1078                 return (0);
1079         case PF_ADDR_DYNIFTL:
1080                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1081         case PF_ADDR_NOROUTE:
1082                 return (0);
1083         case PF_ADDR_TABLE:
1084                 return (aw1->p.tbl != aw2->p.tbl);
1085         default:
1086                 kprintf("invalid address type: %d\n", aw1->type);
1087                 return (1);
1088         }
1089 }
1090
1091 void
1092 pf_update_anchor_rules(void)
1093 {
1094         struct pf_rule  *rule;
1095         int              i;
1096
1097         for (i = 0; i < PF_RULESET_MAX; ++i)
1098                 TAILQ_FOREACH(rule, pf_main_ruleset.rules[i].active.ptr,
1099                     entries)
1100                         if (rule->anchorname[0])
1101                                 rule->anchor = pf_find_anchor(rule->anchorname);
1102                         else
1103                                 rule->anchor = NULL;
1104 }
1105
1106 u_int16_t
1107 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1108 {
1109         u_int32_t       l;
1110
1111         if (udp && !cksum)
1112                 return (0x0000);
1113         l = cksum + old - new;
1114         l = (l >> 16) + (l & 65535);
1115         l = l & 65535;
1116         if (udp && !l)
1117                 return (0xFFFF);
1118         return (l);
1119 }
1120
1121 void
1122 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1123     struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1124 {
1125         struct pf_addr  ao;
1126         u_int16_t       po = *p;
1127
1128         PF_ACPY(&ao, a, af);
1129         PF_ACPY(a, an, af);
1130
1131         *p = pn;
1132
1133         switch (af) {
1134 #ifdef INET
1135         case AF_INET:
1136                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1137                     ao.addr16[0], an->addr16[0], 0),
1138                     ao.addr16[1], an->addr16[1], 0);
1139                 *p = pn;
1140                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1141                     ao.addr16[0], an->addr16[0], u),
1142                     ao.addr16[1], an->addr16[1], u),
1143                     po, pn, u);
1144                 break;
1145 #endif /* INET */
1146 #ifdef INET6
1147         case AF_INET6:
1148                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1149                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1150                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1151                     ao.addr16[0], an->addr16[0], u),
1152                     ao.addr16[1], an->addr16[1], u),
1153                     ao.addr16[2], an->addr16[2], u),
1154                     ao.addr16[3], an->addr16[3], u),
1155                     ao.addr16[4], an->addr16[4], u),
1156                     ao.addr16[5], an->addr16[5], u),
1157                     ao.addr16[6], an->addr16[6], u),
1158                     ao.addr16[7], an->addr16[7], u),
1159                     po, pn, u);
1160                 break;
1161 #endif /* INET6 */
1162         }
1163 }
1164
1165
1166 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
1167 void
1168 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1169 {
1170         u_int32_t       ao;
1171
1172         memcpy(&ao, a, sizeof(ao));
1173         memcpy(a, &an, sizeof(u_int32_t));
1174         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1175             ao % 65536, an % 65536, u);
1176 }
1177
1178 #ifdef INET6
1179 void
1180 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1181 {
1182         struct pf_addr  ao;
1183
1184         PF_ACPY(&ao, a, AF_INET6);
1185         PF_ACPY(a, an, AF_INET6);
1186
1187         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1188             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1189             pf_cksum_fixup(pf_cksum_fixup(*c,
1190             ao.addr16[0], an->addr16[0], u),
1191             ao.addr16[1], an->addr16[1], u),
1192             ao.addr16[2], an->addr16[2], u),
1193             ao.addr16[3], an->addr16[3], u),
1194             ao.addr16[4], an->addr16[4], u),
1195             ao.addr16[5], an->addr16[5], u),
1196             ao.addr16[6], an->addr16[6], u),
1197             ao.addr16[7], an->addr16[7], u);
1198 }
1199 #endif /* INET6 */
1200
1201 void
1202 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1203     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1204     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1205 {
1206         struct pf_addr  oia, ooa;
1207
1208         PF_ACPY(&oia, ia, af);
1209         PF_ACPY(&ooa, oa, af);
1210
1211         /* Change inner protocol port, fix inner protocol checksum. */
1212         if (ip != NULL) {
1213                 u_int16_t       oip = *ip;
1214                 u_int32_t       opc = 0;
1215
1216                 if (pc != NULL)
1217                         opc = *pc;
1218                 *ip = np;
1219                 if (pc != NULL)
1220                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1221                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1222                 if (pc != NULL)
1223                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1224         }
1225         /* Change inner ip address, fix inner ip and icmp checksums. */
1226         PF_ACPY(ia, na, af);
1227         switch (af) {
1228 #ifdef INET
1229         case AF_INET: {
1230                 u_int32_t        oh2c = *h2c;
1231
1232                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1233                     oia.addr16[0], ia->addr16[0], 0),
1234                     oia.addr16[1], ia->addr16[1], 0);
1235                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1236                     oia.addr16[0], ia->addr16[0], 0),
1237                     oia.addr16[1], ia->addr16[1], 0);
1238                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1239                 break;
1240         }
1241 #endif /* INET */
1242 #ifdef INET6
1243         case AF_INET6:
1244                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1245                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1246                     pf_cksum_fixup(pf_cksum_fixup(*ic,
1247                     oia.addr16[0], ia->addr16[0], u),
1248                     oia.addr16[1], ia->addr16[1], u),
1249                     oia.addr16[2], ia->addr16[2], u),
1250                     oia.addr16[3], ia->addr16[3], u),
1251                     oia.addr16[4], ia->addr16[4], u),
1252                     oia.addr16[5], ia->addr16[5], u),
1253                     oia.addr16[6], ia->addr16[6], u),
1254                     oia.addr16[7], ia->addr16[7], u);
1255                 break;
1256 #endif /* INET6 */
1257         }
1258         /* Change outer ip address, fix outer ip or icmpv6 checksum. */
1259         PF_ACPY(oa, na, af);
1260         switch (af) {
1261 #ifdef INET
1262         case AF_INET:
1263                 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1264                     ooa.addr16[0], oa->addr16[0], 0),
1265                     ooa.addr16[1], oa->addr16[1], 0);
1266                 break;
1267 #endif /* INET */
1268 #ifdef INET6
1269         case AF_INET6:
1270                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1271                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1272                     pf_cksum_fixup(pf_cksum_fixup(*ic,
1273                     ooa.addr16[0], oa->addr16[0], u),
1274                     ooa.addr16[1], oa->addr16[1], u),
1275                     ooa.addr16[2], oa->addr16[2], u),
1276                     ooa.addr16[3], oa->addr16[3], u),
1277                     ooa.addr16[4], oa->addr16[4], u),
1278                     ooa.addr16[5], oa->addr16[5], u),
1279                     ooa.addr16[6], oa->addr16[6], u),
1280                     ooa.addr16[7], oa->addr16[7], u);
1281                 break;
1282 #endif /* INET6 */
1283         }
1284 }
1285
1286 void
1287 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1288     const struct pf_addr *saddr, const struct pf_addr *daddr,
1289     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1290     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl)
1291 {
1292         struct mbuf     *m;
1293         int              len = 0, tlen;
1294 #ifdef INET
1295         struct ip       *h = NULL;
1296 #endif /* INET */
1297 #ifdef INET6
1298         struct ip6_hdr  *h6 = NULL;
1299 #endif /* INET6 */
1300         struct tcphdr   *th = NULL;
1301         char *opt;
1302
1303         /* maximum segment size tcp option */
1304         tlen = sizeof(struct tcphdr);
1305         if (mss)
1306                 tlen += 4;
1307
1308         switch (af) {
1309 #ifdef INET
1310         case AF_INET:
1311                 len = sizeof(struct ip) + tlen;
1312                 break;
1313 #endif /* INET */
1314 #ifdef INET6
1315         case AF_INET6:
1316                 len = sizeof(struct ip6_hdr) + tlen;
1317                 break;
1318 #endif /* INET6 */
1319         }
1320
1321         /* create outgoing mbuf */
1322         m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1323         if (m == NULL)
1324                 return;
1325         m->m_pkthdr.fw_flags = PF_MBUF_GENERATED;
1326 #ifdef ALTQ
1327         if (r != NULL && r->qid) {
1328                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
1329                 m->m_pkthdr.altq_qid = r->qid;
1330                 m->m_pkthdr.ecn_af = af;
1331                 m->m_pkthdr.header = mtod(m, struct ip *);
1332         }
1333 #endif
1334         m->m_data += max_linkhdr;
1335         m->m_pkthdr.len = m->m_len = len;
1336         m->m_pkthdr.rcvif = NULL;
1337         bzero(m->m_data, len);
1338         switch (af) {
1339 #ifdef INET
1340         case AF_INET:
1341                 h = mtod(m, struct ip *);
1342
1343                 /* IP header fields included in the TCP checksum */
1344                 h->ip_p = IPPROTO_TCP;
1345                 h->ip_len = tlen;
1346                 h->ip_src.s_addr = saddr->v4.s_addr;
1347                 h->ip_dst.s_addr = daddr->v4.s_addr;
1348
1349                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1350                 break;
1351 #endif /* INET */
1352 #ifdef INET6
1353         case AF_INET6:
1354                 h6 = mtod(m, struct ip6_hdr *);
1355
1356                 /* IP header fields included in the TCP checksum */
1357                 h6->ip6_nxt = IPPROTO_TCP;
1358                 h6->ip6_plen = htons(tlen);
1359                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1360                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1361
1362                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1363                 break;
1364 #endif /* INET6 */
1365         }
1366
1367         /* TCP header */
1368         th->th_sport = sport;
1369         th->th_dport = dport;
1370         th->th_seq = htonl(seq);
1371         th->th_ack = htonl(ack);
1372         th->th_off = tlen >> 2;
1373         th->th_flags = flags;
1374         th->th_win = htons(win);
1375
1376         if (mss) {
1377                 opt = (char *)(th + 1);
1378                 opt[0] = TCPOPT_MAXSEG;
1379                 opt[1] = 4;
1380                 mss = htons(mss);
1381                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1382         }
1383
1384         switch (af) {
1385 #ifdef INET
1386         case AF_INET:
1387                 /* TCP checksum */
1388                 th->th_sum = in_cksum(m, len);
1389
1390                 /* Finish the IP header */
1391                 h->ip_v = 4;
1392                 h->ip_hl = sizeof(*h) >> 2;
1393                 h->ip_tos = IPTOS_LOWDELAY;
1394                 h->ip_len = len;
1395                 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1396                 h->ip_ttl = ttl ? ttl : ip_defttl;
1397                 h->ip_sum = 0;
1398                 ip_output(m, (void *)NULL, (void *)NULL, 0, (void *)NULL,
1399                     (void *)NULL);
1400                 break;
1401 #endif /* INET */
1402 #ifdef INET6
1403         case AF_INET6:
1404                 /* TCP checksum */
1405                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1406                     sizeof(struct ip6_hdr), tlen);
1407
1408                 h6->ip6_vfc |= IPV6_VERSION;
1409                 h6->ip6_hlim = IPV6_DEFHLIM;
1410
1411                 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
1412                 break;
1413 #endif /* INET6 */
1414         }
1415 }
1416
1417 void
1418 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1419     struct pf_rule *r)
1420 {
1421         struct mbuf     *m0;
1422
1423         m0 = m_copypacket(m, MB_DONTWAIT);
1424         if (m0 == NULL)
1425                 return;
1426         m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED;
1427
1428 #ifdef ALTQ
1429         if (r->qid) {
1430                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
1431                 m->m_pkthdr.altq_qid = r->qid;
1432                 m->m_pkthdr.ecn_af = af;
1433                 m->m_pkthdr.header = mtod(m0, struct ip *);
1434         }
1435 #endif
1436
1437         switch (af) {
1438 #ifdef INET
1439         case AF_INET:
1440                 icmp_error(m0, type, code, 0, 0);
1441                 break;
1442 #endif /* INET */
1443 #ifdef INET6
1444         case AF_INET6:
1445                 icmp6_error(m0, type, code, 0);
1446                 break;
1447 #endif /* INET6 */
1448         }
1449 }
1450
1451 /*
1452  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1453  * If n is 0, they match if they are equal. If n is != 0, they match if they
1454  * are different.
1455  */
1456 int
1457 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1458     struct pf_addr *b, sa_family_t af)
1459 {
1460         int     match = 0;
1461
1462         switch (af) {
1463 #ifdef INET
1464         case AF_INET:
1465                 if ((a->addr32[0] & m->addr32[0]) ==
1466                     (b->addr32[0] & m->addr32[0]))
1467                         match++;
1468                 break;
1469 #endif /* INET */
1470 #ifdef INET6
1471         case AF_INET6:
1472                 if (((a->addr32[0] & m->addr32[0]) ==
1473                      (b->addr32[0] & m->addr32[0])) &&
1474                     ((a->addr32[1] & m->addr32[1]) ==
1475                      (b->addr32[1] & m->addr32[1])) &&
1476                     ((a->addr32[2] & m->addr32[2]) ==
1477                      (b->addr32[2] & m->addr32[2])) &&
1478                     ((a->addr32[3] & m->addr32[3]) ==
1479                      (b->addr32[3] & m->addr32[3])))
1480                         match++;
1481                 break;
1482 #endif /* INET6 */
1483         }
1484         if (match) {
1485                 if (n)
1486                         return (0);
1487                 else
1488                         return (1);
1489         } else {
1490                 if (n)
1491                         return (1);
1492                 else
1493                         return (0);
1494         }
1495 }
1496
1497 int
1498 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
1499 {
1500         switch (op) {
1501         case PF_OP_IRG:
1502                 return ((p > a1) && (p < a2));
1503         case PF_OP_XRG:
1504                 return ((p < a1) || (p > a2));
1505         case PF_OP_RRG:
1506                 return ((p >= a1) && (p <= a2));
1507         case PF_OP_EQ:
1508                 return (p == a1);
1509         case PF_OP_NE:
1510                 return (p != a1);
1511         case PF_OP_LT:
1512                 return (p < a1);
1513         case PF_OP_LE:
1514                 return (p <= a1);
1515         case PF_OP_GT:
1516                 return (p > a1);
1517         case PF_OP_GE:
1518                 return (p >= a1);
1519         }
1520         return (0); /* never reached */
1521 }
1522
1523 int
1524 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
1525 {
1526         a1 = ntohs(a1);
1527         a2 = ntohs(a2);
1528         p = ntohs(p);
1529         return (pf_match(op, a1, a2, p));
1530 }
1531
1532 int
1533 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
1534 {
1535         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1536                 return (0);
1537         return (pf_match(op, a1, a2, u));
1538 }
1539
1540 int
1541 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
1542 {
1543         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1544                 return (0);
1545         return (pf_match(op, a1, a2, g));
1546 }
1547
1548 static int
1549 pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_rule *nat_rule,
1550              int *tag)
1551 {
1552         if (*tag == -1) {       /* find mbuf tag */
1553                 if (nat_rule != NULL && nat_rule->tag)
1554                         *tag = nat_rule->tag;
1555                 else if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
1556                         *tag = m->m_pkthdr.pf_tag;
1557                 else
1558                         *tag = 0;
1559         }
1560
1561         return ((!r->match_tag_not && r->match_tag == *tag) ||
1562             (r->match_tag_not && r->match_tag != *tag));
1563 }
1564
1565 void
1566 pf_tag_packet(struct mbuf *m, int tag)
1567 {
1568         if (tag <= 0)
1569                 return;
1570
1571         m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1572         m->m_pkthdr.pf_tag = tag;
1573 }
1574
1575 #define PF_STEP_INTO_ANCHOR(r, a, s, n)                                 \
1576         do {                                                            \
1577                 if ((r) == NULL || (r)->anchor == NULL ||               \
1578                     (s) != NULL || (a) != NULL)                         \
1579                         panic("PF_STEP_INTO_ANCHOR");                   \
1580                 (a) = (r);                                              \
1581                 (s) = TAILQ_FIRST(&(r)->anchor->rulesets);              \
1582                 (r) = NULL;                                             \
1583                 while ((s) != NULL && ((r) =                            \
1584                     TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL)     \
1585                         (s) = TAILQ_NEXT((s), entries);                 \
1586                 if ((r) == NULL) {                                      \
1587                         (r) = TAILQ_NEXT((a), entries);                 \
1588                         (a) = NULL;                                     \
1589                 }                                                       \
1590         } while (0)
1591
1592 #define PF_STEP_OUT_OF_ANCHOR(r, a, s, n)                               \
1593         do {                                                            \
1594                 if ((r) != NULL || (a) == NULL || (s) == NULL)          \
1595                         panic("PF_STEP_OUT_OF_ANCHOR");                 \
1596                 (s) = TAILQ_NEXT((s), entries);                         \
1597                 while ((s) != NULL && ((r) =                            \
1598                     TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL)     \
1599                         (s) = TAILQ_NEXT((s), entries);                 \
1600                 if ((r) == NULL) {                                      \
1601                         (r) = TAILQ_NEXT((a), entries);                 \
1602                         (a) = NULL;                                     \
1603                 }                                                       \
1604         } while (0)
1605
1606 #ifdef INET6
1607 void
1608 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
1609     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
1610 {
1611         switch (af) {
1612 #ifdef INET
1613         case AF_INET:
1614                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
1615                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
1616                 break;
1617 #endif /* INET */
1618         case AF_INET6:
1619                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
1620                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
1621                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
1622                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
1623                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
1624                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
1625                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
1626                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
1627                 break;
1628         }
1629 }
1630
1631 void
1632 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
1633 {
1634         switch (af) {
1635 #ifdef INET
1636         case AF_INET:
1637                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
1638                 break;
1639 #endif /* INET */
1640         case AF_INET6:
1641                 if (addr->addr32[3] == 0xffffffff) {
1642                         addr->addr32[3] = 0;
1643                         if (addr->addr32[2] == 0xffffffff) {
1644                                 addr->addr32[2] = 0;
1645                                 if (addr->addr32[1] == 0xffffffff) {
1646                                         addr->addr32[1] = 0;
1647                                         addr->addr32[0] =
1648                                             htonl(ntohl(addr->addr32[0]) + 1);
1649                                 } else
1650                                         addr->addr32[1] =
1651                                             htonl(ntohl(addr->addr32[1]) + 1);
1652                         } else
1653                                 addr->addr32[2] =
1654                                     htonl(ntohl(addr->addr32[2]) + 1);
1655                 } else
1656                         addr->addr32[3] =
1657                             htonl(ntohl(addr->addr32[3]) + 1);
1658                 break;
1659         }
1660 }
1661 #endif /* INET6 */
1662
1663 #define mix(a,b,c) \
1664         do {                                    \
1665                 a -= b; a -= c; a ^= (c >> 13); \
1666                 b -= c; b -= a; b ^= (a << 8);  \
1667                 c -= a; c -= b; c ^= (b >> 13); \
1668                 a -= b; a -= c; a ^= (c >> 12); \
1669                 b -= c; b -= a; b ^= (a << 16); \
1670                 c -= a; c -= b; c ^= (b >> 5);  \
1671                 a -= b; a -= c; a ^= (c >> 3);  \
1672                 b -= c; b -= a; b ^= (a << 10); \
1673                 c -= a; c -= b; c ^= (b >> 15); \
1674         } while (0)
1675
1676 /*
1677  * hash function based on bridge_hash in if_bridge.c
1678  */
1679 void
1680 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
1681     struct pf_poolhashkey *key, sa_family_t af)
1682 {
1683         u_int32_t       a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
1684
1685         switch (af) {
1686 #ifdef INET
1687         case AF_INET:
1688                 a += inaddr->addr32[0];
1689                 b += key->key32[1];
1690                 mix(a, b, c);
1691                 hash->addr32[0] = c + key->key32[2];
1692                 break;
1693 #endif /* INET */
1694 #ifdef INET6
1695         case AF_INET6:
1696                 a += inaddr->addr32[0];
1697                 b += inaddr->addr32[2];
1698                 mix(a, b, c);
1699                 hash->addr32[0] = c;
1700                 a += inaddr->addr32[1];
1701                 b += inaddr->addr32[3];
1702                 c += key->key32[1];
1703                 mix(a, b, c);
1704                 hash->addr32[1] = c;
1705                 a += inaddr->addr32[2];
1706                 b += inaddr->addr32[1];
1707                 c += key->key32[2];
1708                 mix(a, b, c);
1709                 hash->addr32[2] = c;
1710                 a += inaddr->addr32[3];
1711                 b += inaddr->addr32[0];
1712                 c += key->key32[3];
1713                 mix(a, b, c);
1714                 hash->addr32[3] = c;
1715                 break;
1716 #endif /* INET6 */
1717         }
1718 }
1719
1720 int
1721 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
1722     struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
1723 {
1724         unsigned char            hash[16];
1725         struct pf_pool          *rpool = &r->rpool;
1726         struct pf_addr          *raddr = &rpool->cur->addr.v.a.addr;
1727         struct pf_addr          *rmask = &rpool->cur->addr.v.a.mask;
1728         struct pf_pooladdr      *acur = rpool->cur;
1729         struct pf_src_node       k;
1730
1731         if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
1732             (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
1733                 k.af = af;
1734                 PF_ACPY(&k.addr, saddr, af);
1735                 if (r->rule_flag & PFRULE_RULESRCTRACK ||
1736                     r->rpool.opts & PF_POOL_STICKYADDR)
1737                         k.rule.ptr = r;
1738                 else
1739                         k.rule.ptr = NULL;
1740                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
1741                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
1742                 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
1743                         PF_ACPY(naddr, &(*sn)->raddr, af);
1744                         if (pf_status.debug >= PF_DEBUG_MISC) {
1745                                 kprintf("pf_map_addr: src tracking maps ");
1746                                 pf_print_host(&k.addr, 0, af);
1747                                 kprintf(" to ");
1748                                 pf_print_host(naddr, 0, af);
1749                                 kprintf("\n");
1750                         }
1751                         return (0);
1752                 }
1753         }
1754
1755         if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
1756                 return (1);
1757         if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1758                 if (af == AF_INET) {
1759                         if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
1760                             (rpool->opts & PF_POOL_TYPEMASK) !=
1761                             PF_POOL_ROUNDROBIN)
1762                                 return (1);
1763                          raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
1764                          rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
1765                 } else {
1766                         if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
1767                             (rpool->opts & PF_POOL_TYPEMASK) !=
1768                             PF_POOL_ROUNDROBIN)
1769                                 return (1);
1770                         raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
1771                         rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
1772                 }
1773         } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1774                 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
1775                         return (1); /* unsupported */
1776         } else {
1777                 raddr = &rpool->cur->addr.v.a.addr;
1778                 rmask = &rpool->cur->addr.v.a.mask;
1779         }
1780
1781         switch (rpool->opts & PF_POOL_TYPEMASK) {
1782         case PF_POOL_NONE:
1783                 PF_ACPY(naddr, raddr, af);
1784                 break;
1785         case PF_POOL_BITMASK:
1786                 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
1787                 break;
1788         case PF_POOL_RANDOM:
1789                 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
1790                         switch (af) {
1791 #ifdef INET
1792                         case AF_INET:
1793                                 rpool->counter.addr32[0] = karc4random();
1794                                 break;
1795 #endif /* INET */
1796 #ifdef INET6
1797                         case AF_INET6:
1798                                 if (rmask->addr32[3] != 0xffffffff)
1799                                         rpool->counter.addr32[3] = karc4random();
1800                                 else
1801                                         break;
1802                                 if (rmask->addr32[2] != 0xffffffff)
1803                                         rpool->counter.addr32[2] = karc4random();
1804                                 else
1805                                         break;
1806                                 if (rmask->addr32[1] != 0xffffffff)
1807                                         rpool->counter.addr32[1] = karc4random();
1808                                 else
1809                                         break;
1810                                 if (rmask->addr32[0] != 0xffffffff)
1811                                         rpool->counter.addr32[0] = karc4random();
1812                                 break;
1813 #endif /* INET6 */
1814                         }
1815                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
1816                         PF_ACPY(init_addr, naddr, af);
1817
1818                 } else {
1819                         PF_AINC(&rpool->counter, af);
1820                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
1821                 }
1822                 break;
1823         case PF_POOL_SRCHASH:
1824                 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
1825                 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
1826                 break;
1827         case PF_POOL_ROUNDROBIN:
1828                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1829                         if (!pfr_pool_get(rpool->cur->addr.p.tbl,
1830                             &rpool->tblidx, &rpool->counter,
1831                             &raddr, &rmask, af))
1832                                 goto get_addr;
1833                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1834                         if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
1835                             &rpool->tblidx, &rpool->counter,
1836                             &raddr, &rmask, af))
1837                                 goto get_addr;
1838                 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
1839                         goto get_addr;
1840
1841         try_next:
1842                 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
1843                         rpool->cur = TAILQ_FIRST(&rpool->list);
1844                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1845                         rpool->tblidx = -1;
1846                         if (pfr_pool_get(rpool->cur->addr.p.tbl,
1847                             &rpool->tblidx, &rpool->counter,
1848                             &raddr, &rmask, af)) {
1849                                 /* table contains no address of type 'af' */
1850                                 if (rpool->cur != acur)
1851                                         goto try_next;
1852                                 return (1);
1853                         }
1854                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1855                         rpool->tblidx = -1;
1856                         if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
1857                             &rpool->tblidx, &rpool->counter,
1858                             &raddr, &rmask, af)) {
1859                                 /* table contains no address of type 'af' */
1860                                 if (rpool->cur != acur)
1861                                         goto try_next;
1862                                 return (1);
1863                         }
1864                 } else {
1865                         raddr = &rpool->cur->addr.v.a.addr;
1866                         rmask = &rpool->cur->addr.v.a.mask;
1867                         PF_ACPY(&rpool->counter, raddr, af);
1868                 }
1869
1870         get_addr:
1871                 PF_ACPY(naddr, &rpool->counter, af);
1872                 PF_AINC(&rpool->counter, af);
1873                 break;
1874         }
1875         if (*sn != NULL)
1876                 PF_ACPY(&(*sn)->raddr, naddr, af);
1877
1878         if (pf_status.debug >= PF_DEBUG_MISC &&
1879             (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
1880                 kprintf("pf_map_addr: selected address ");
1881                 pf_print_host(naddr, 0, af);
1882                 kprintf("\n");
1883         }
1884
1885         return (0);
1886 }
1887
1888 int
1889 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
1890     struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
1891     struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
1892     struct pf_src_node **sn)
1893 {
1894         struct pf_state         key;
1895         struct pf_addr          init_addr;
1896         u_int16_t               cut;
1897
1898         bzero(&init_addr, sizeof(init_addr));
1899         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
1900                 return (1);
1901
1902         do {
1903                 key.af = af;
1904                 key.proto = proto;
1905                 PF_ACPY(&key.ext.addr, daddr, key.af);
1906                 PF_ACPY(&key.gwy.addr, naddr, key.af);
1907                 key.ext.port = dport;
1908
1909                 /*
1910                  * port search; start random, step;
1911                  * similar 2 portloop in in_pcbbind
1912                  */
1913                 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP)) {
1914                         key.gwy.port = 0;
1915                         if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
1916                                 return (0);
1917                 } else if (low == 0 && high == 0) {
1918                         key.gwy.port = *nport;
1919                         if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
1920                                 return (0);
1921                 } else if (low == high) {
1922                         key.gwy.port = htons(low);
1923                         if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) {
1924                                 *nport = htons(low);
1925                                 return (0);
1926                         }
1927                 } else {
1928                         u_int16_t tmp;
1929
1930                         if (low > high) {
1931                                 tmp = low;
1932                                 low = high;
1933                                 high = tmp;
1934                         }
1935                         /* low < high */
1936                         cut = karc4random() % (1 + high - low) + low;
1937                         /* low <= cut <= high */
1938                         for (tmp = cut; tmp <= high; ++(tmp)) {
1939                                 key.gwy.port = htons(tmp);
1940                                 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
1941                                     NULL) {
1942                                         *nport = htons(tmp);
1943                                         return (0);
1944                                 }
1945                         }
1946                         for (tmp = cut - 1; tmp >= low; --(tmp)) {
1947                                 key.gwy.port = htons(tmp);
1948                                 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
1949                                     NULL) {
1950                                         *nport = htons(tmp);
1951                                         return (0);
1952                                 }
1953                         }
1954                 }
1955
1956                 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
1957                 case PF_POOL_RANDOM:
1958                 case PF_POOL_ROUNDROBIN:
1959                         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
1960                                 return (1);
1961                         break;
1962                 case PF_POOL_NONE:
1963                 case PF_POOL_SRCHASH:
1964                 case PF_POOL_BITMASK:
1965                 default:
1966                         return (1);
1967                 }
1968         } while (! PF_AEQ(&init_addr, naddr, af) );
1969
1970         return (1);                                     /* none available */
1971 }
1972
1973 struct pf_rule *
1974 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
1975     int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
1976     struct pf_addr *daddr, u_int16_t dport, int rs_num)
1977 {
1978         struct pf_rule          *r, *rm = NULL, *anchorrule = NULL;
1979         struct pf_ruleset       *ruleset = NULL;
1980
1981         r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
1982         while (r && rm == NULL) {
1983                 struct pf_rule_addr     *src = NULL, *dst = NULL;
1984                 struct pf_addr_wrap     *xdst = NULL;
1985
1986                 if (r->action == PF_BINAT && direction == PF_IN) {
1987                         src = &r->dst;
1988                         if (r->rpool.cur != NULL)
1989                                 xdst = &r->rpool.cur->addr;
1990                 } else {
1991                         src = &r->src;
1992                         dst = &r->dst;
1993                 }
1994
1995                 r->evaluations++;
1996                 if (r->kif != NULL &&
1997                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
1998                         r = r->skip[PF_SKIP_IFP].ptr;
1999                 else if (r->direction && r->direction != direction)
2000                         r = r->skip[PF_SKIP_DIR].ptr;
2001                 else if (r->af && r->af != pd->af)
2002                         r = r->skip[PF_SKIP_AF].ptr;
2003                 else if (r->proto && r->proto != pd->proto)
2004                         r = r->skip[PF_SKIP_PROTO].ptr;
2005                 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->not))
2006                         r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
2007                             PF_SKIP_DST_ADDR].ptr;
2008                 else if (src->port_op && !pf_match_port(src->port_op,
2009                     src->port[0], src->port[1], sport))
2010                         r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
2011                             PF_SKIP_DST_PORT].ptr;
2012                 else if (dst != NULL &&
2013                     PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->not))
2014                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2015                 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0))
2016                         r = TAILQ_NEXT(r, entries);
2017                 else if (dst != NULL && dst->port_op &&
2018                     !pf_match_port(dst->port_op, dst->port[0],
2019                     dst->port[1], dport))
2020                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2021                 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2022                     IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2023                     off, pd->hdr.tcp), r->os_fingerprint)))
2024                         r = TAILQ_NEXT(r, entries);
2025                 else if (r->anchorname[0] && r->anchor == NULL)
2026                         r = TAILQ_NEXT(r, entries);
2027                 else if (r->anchor == NULL)
2028                                 rm = r;
2029                 else
2030                         PF_STEP_INTO_ANCHOR(r, anchorrule, ruleset, rs_num);
2031                 if (r == NULL && anchorrule != NULL)
2032                         PF_STEP_OUT_OF_ANCHOR(r, anchorrule, ruleset,
2033                             rs_num);
2034         }
2035         if (rm != NULL && (rm->action == PF_NONAT ||
2036             rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2037                 return (NULL);
2038         return (rm);
2039 }
2040
2041 struct pf_rule *
2042 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2043     struct pfi_kif *kif, struct pf_src_node **sn,
2044     struct pf_addr *saddr, u_int16_t sport,
2045     struct pf_addr *daddr, u_int16_t dport,
2046     struct pf_addr *naddr, u_int16_t *nport)
2047 {
2048         struct pf_rule  *r = NULL;
2049
2050         if (direction == PF_OUT) {
2051                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2052                     sport, daddr, dport, PF_RULESET_BINAT);
2053                 if (r == NULL)
2054                         r = pf_match_translation(pd, m, off, direction, kif,
2055                             saddr, sport, daddr, dport, PF_RULESET_NAT);
2056         } else {
2057                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2058                     sport, daddr, dport, PF_RULESET_RDR);
2059                 if (r == NULL)
2060                         r = pf_match_translation(pd, m, off, direction, kif,
2061                             saddr, sport, daddr, dport, PF_RULESET_BINAT);
2062         }
2063
2064         if (r != NULL) {
2065                 switch (r->action) {
2066                 case PF_NONAT:
2067                 case PF_NOBINAT:
2068                 case PF_NORDR:
2069                         return (NULL);
2070                 case PF_NAT:
2071                         if (pf_get_sport(pd->af, pd->proto, r, saddr,
2072                             daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2073                             r->rpool.proxy_port[1], sn)) {
2074                                 DPFPRINTF(PF_DEBUG_MISC,
2075                                     ("pf: NAT proxy port allocation "
2076                                     "(%u-%u) failed\n",
2077                                     r->rpool.proxy_port[0],
2078                                     r->rpool.proxy_port[1]));
2079                                 return (NULL);
2080                         }
2081                         break;
2082                 case PF_BINAT:
2083                         switch (direction) {
2084                         case PF_OUT:
2085                                 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
2086                                         if (pd->af == AF_INET) {
2087                                                 if (r->rpool.cur->addr.p.dyn->
2088                                                     pfid_acnt4 < 1)
2089                                                         return (NULL);
2090                                                 PF_POOLMASK(naddr,
2091                                                     &r->rpool.cur->addr.p.dyn->
2092                                                     pfid_addr4,
2093                                                     &r->rpool.cur->addr.p.dyn->
2094                                                     pfid_mask4,
2095                                                     saddr, AF_INET);
2096                                         } else {
2097                                                 if (r->rpool.cur->addr.p.dyn->
2098                                                     pfid_acnt6 < 1)
2099                                                         return (NULL);
2100                                                 PF_POOLMASK(naddr,
2101                                                     &r->rpool.cur->addr.p.dyn->
2102                                                     pfid_addr6,
2103                                                     &r->rpool.cur->addr.p.dyn->
2104                                                     pfid_mask6,
2105                                                     saddr, AF_INET6);
2106                                         }
2107                                 } else
2108                                         PF_POOLMASK(naddr,
2109                                             &r->rpool.cur->addr.v.a.addr,
2110                                             &r->rpool.cur->addr.v.a.mask,
2111                                             saddr, pd->af);
2112                                 break;
2113                         case PF_IN:
2114                                 if (r->src.addr.type == PF_ADDR_DYNIFTL){
2115                                         if (pd->af == AF_INET) {
2116                                                 if (r->src.addr.p.dyn->
2117                                                     pfid_acnt4 < 1)
2118                                                         return (NULL);
2119                                                 PF_POOLMASK(naddr,
2120                                                     &r->src.addr.p.dyn->
2121                                                     pfid_addr4,
2122                                                     &r->src.addr.p.dyn->
2123                                                     pfid_mask4,
2124                                                     daddr, AF_INET);
2125                                         } else {
2126                                                 if (r->src.addr.p.dyn->
2127                                                     pfid_acnt6 < 1)
2128                                                         return (NULL);
2129                                                 PF_POOLMASK(naddr,
2130                                                     &r->src.addr.p.dyn->
2131                                                     pfid_addr6,
2132                                                     &r->src.addr.p.dyn->
2133                                                     pfid_mask6,
2134                                                     daddr, AF_INET6);
2135                                         }
2136                                 } else
2137                                         PF_POOLMASK(naddr,
2138                                             &r->src.addr.v.a.addr,
2139                                             &r->src.addr.v.a.mask, daddr,
2140                                             pd->af);
2141                                 break;
2142                         }
2143                         break;
2144                 case PF_RDR: {
2145                         if (pf_map_addr(r->af, r, saddr, naddr, NULL, sn))
2146                                 return (NULL);
2147
2148                         if (r->rpool.proxy_port[1]) {
2149                                 u_int32_t       tmp_nport;
2150
2151                                 tmp_nport = ((ntohs(dport) -
2152                                     ntohs(r->dst.port[0])) %
2153                                     (r->rpool.proxy_port[1] -
2154                                     r->rpool.proxy_port[0] + 1)) +
2155                                     r->rpool.proxy_port[0];
2156
2157                                 /* wrap around if necessary */
2158                                 if (tmp_nport > 65535)
2159                                         tmp_nport -= 65535;
2160                                 *nport = htons((u_int16_t)tmp_nport);
2161                         } else if (r->rpool.proxy_port[0])
2162                                 *nport = htons(r->rpool.proxy_port[0]);
2163                         break;
2164                 }
2165                 default:
2166                         return (NULL);
2167                 }
2168         }
2169
2170         return (r);
2171 }
2172
2173 #ifdef SMP
2174 struct netmsg_hashlookup {
2175         struct netmsg           nm_netmsg;
2176         struct inpcb            **nm_pinp;
2177         struct inpcbinfo        *nm_pcbinfo;
2178         struct pf_addr          *nm_saddr;
2179         struct pf_addr          *nm_daddr;
2180         uint16_t                nm_sport;
2181         uint16_t                nm_dport;
2182         sa_family_t             nm_af;
2183 };
2184
2185 static void
2186 in_pcblookup_hash_handler(struct netmsg *msg0)
2187 {
2188         struct netmsg_hashlookup *msg = (struct netmsg_hashlookup *)msg0;
2189
2190         if (msg->nm_af == AF_INET)
2191                 *msg->nm_pinp = in_pcblookup_hash(msg->nm_pcbinfo,
2192                     msg->nm_saddr->v4, msg->nm_sport, msg->nm_daddr->v4,
2193                     msg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2194 #ifdef INET6
2195         else
2196                 *msg->nm_pinp = in6_pcblookup_hash(msg->nm_pcbinfo,
2197                     &msg->nm_saddr->v6, msg->nm_sport, &msg->nm_daddr->v6,
2198                     msg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2199 #endif /* INET6 */
2200         lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, 0);
2201 }
2202 #endif /* SMP */
2203
2204 int
2205 pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd)
2206 {
2207         struct pf_addr          *saddr, *daddr;
2208         u_int16_t                sport, dport;
2209         struct inpcbinfo        *pi;
2210         struct inpcb            *inp;
2211 #ifdef SMP
2212         struct netmsg_hashlookup *msg = NULL;
2213 #endif
2214         int                      pi_cpu = 0;
2215
2216         *uid = UID_MAX;
2217         *gid = GID_MAX;
2218         if (direction == PF_IN) {
2219                 saddr = pd->src;
2220                 daddr = pd->dst;
2221         } else {
2222                 saddr = pd->dst;
2223                 daddr = pd->src;
2224         }
2225         switch (pd->proto) {
2226         case IPPROTO_TCP:
2227                 sport = pd->hdr.tcp->th_sport;
2228                 dport = pd->hdr.tcp->th_dport;
2229
2230                 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2231                 pi = &tcbinfo[pi_cpu];
2232 #ifdef SMP
2233                 /*
2234                  * Our netstack runs lockless on MP systems
2235                  * (only for TCP connections at the moment).
2236                  *
2237                  * As we are not allowed to read another CPU's tcbinfo,
2238                  * we have to ask that CPU via remote call to search the
2239                  * table for us.
2240                  *
2241                  * Prepare a msg iff data belongs to another CPU.
2242                  */
2243                 if (pi_cpu != mycpu->gd_cpuid) {
2244                         msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_INTWAIT);
2245                         netmsg_init(&msg->nm_netmsg, &netisr_afree_rport, 0,
2246                                     in_pcblookup_hash_handler);
2247                         msg->nm_pinp = &inp;
2248                         msg->nm_pcbinfo = pi;
2249                         msg->nm_saddr = saddr;
2250                         msg->nm_sport = sport;
2251                         msg->nm_daddr = daddr;
2252                         msg->nm_dport = dport;
2253                         msg->nm_af = pd->af;
2254                 }
2255 #endif /* SMP */
2256                 break;
2257         case IPPROTO_UDP:
2258                 sport = pd->hdr.udp->uh_sport;
2259                 dport = pd->hdr.udp->uh_dport;
2260                 pi = &udbinfo;
2261                 break;
2262         default:
2263                 return (0);
2264         }
2265         if (direction != PF_IN) {
2266                 u_int16_t       p;
2267
2268                 p = sport;
2269                 sport = dport;
2270                 dport = p;
2271         }
2272         switch (pd->af) {
2273 #ifdef INET6
2274         case AF_INET6:
2275 #ifdef SMP
2276                 /*
2277                  * Query other CPU, second part
2278                  *
2279                  * msg only gets initialized when:
2280                  * 1) packet is TCP
2281                  * 2) the info belongs to another CPU
2282                  *
2283                  * Use some switch/case magic to avoid code duplication.
2284                  */
2285                 if (msg == NULL)
2286 #endif /* SMP */
2287                 {
2288                         inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
2289                             &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
2290
2291                         if (inp == NULL)
2292                                 return (0);
2293                         break;
2294                 }
2295                 /* FALLTHROUGH if SMP and on other CPU */
2296 #endif /* INET6 */
2297         case AF_INET:
2298 #ifdef SMP
2299                 if (msg != NULL) {
2300                         lwkt_sendmsg(tcp_cport(pi_cpu),
2301                                      &msg->nm_netmsg.nm_lmsg);
2302                 } else
2303 #endif /* SMP */
2304                 {
2305                         inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2306                             dport, INPLOOKUP_WILDCARD, NULL);
2307                 }
2308                 if (inp == NULL)
2309                         return (0);
2310                 break;
2311
2312         default:
2313                 return (0);
2314         }
2315         *uid = inp->inp_socket->so_cred->cr_uid;
2316         *gid = inp->inp_socket->so_cred->cr_groups[0];
2317         return (1);
2318 }
2319
2320 u_int8_t
2321 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2322 {
2323         int              hlen;
2324         u_int8_t         hdr[60];
2325         u_int8_t        *opt, optlen;
2326         u_int8_t         wscale = 0;
2327
2328         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
2329         if (hlen <= sizeof(struct tcphdr))
2330                 return (0);
2331         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2332                 return (0);
2333         opt = hdr + sizeof(struct tcphdr);
2334         hlen -= sizeof(struct tcphdr);
2335         while (hlen >= 3) {
2336                 switch (*opt) {
2337                 case TCPOPT_EOL:
2338                 case TCPOPT_NOP:
2339                         ++opt;
2340                         --hlen;
2341                         break;
2342                 case TCPOPT_WINDOW:
2343                         wscale = opt[2];
2344                         if (wscale > TCP_MAX_WINSHIFT)
2345                                 wscale = TCP_MAX_WINSHIFT;
2346                         wscale |= PF_WSCALE_FLAG;
2347                         /* FALLTHROUGH */
2348                 default:
2349                         optlen = opt[1];
2350                         if (optlen < 2)
2351                                 optlen = 2;
2352                         hlen -= optlen;
2353                         opt += optlen;
2354                         break;
2355                 }
2356         }
2357         return (wscale);
2358 }
2359
2360 u_int16_t
2361 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2362 {
2363         int              hlen;
2364         u_int8_t         hdr[60];
2365         u_int8_t        *opt, optlen;
2366         u_int16_t        mss = tcp_mssdflt;
2367
2368         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
2369         if (hlen <= sizeof(struct tcphdr))
2370                 return (0);
2371         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2372                 return (0);
2373         opt = hdr + sizeof(struct tcphdr);
2374         hlen -= sizeof(struct tcphdr);
2375         while (hlen >= TCPOLEN_MAXSEG) {
2376                 switch (*opt) {
2377                 case TCPOPT_EOL:
2378                 case TCPOPT_NOP:
2379                         ++opt;
2380                         --hlen;
2381                         break;
2382                 case TCPOPT_MAXSEG:
2383                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
2384                         /* FALLTHROUGH */
2385                 default:
2386                         optlen = opt[1];
2387                         if (optlen < 2)
2388                                 optlen = 2;
2389                         hlen -= optlen;
2390                         opt += optlen;
2391                         break;
2392                 }
2393         }
2394         return (mss);
2395 }
2396
2397 u_int16_t
2398 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
2399 {
2400 #ifdef INET
2401         struct sockaddr_in      *dst;
2402         struct route             ro;
2403 #endif /* INET */
2404 #ifdef INET6
2405         struct sockaddr_in6     *dst6;
2406         struct route_in6         ro6;
2407 #endif /* INET6 */
2408         struct rtentry          *rt = NULL;
2409         int                      hlen = 0;
2410         u_int16_t                mss = tcp_mssdflt;
2411
2412         switch (af) {
2413 #ifdef INET
2414         case AF_INET:
2415                 hlen = sizeof(struct ip);
2416                 bzero(&ro, sizeof(ro));
2417                 dst = (struct sockaddr_in *)&ro.ro_dst;
2418                 dst->sin_family = AF_INET;
2419                 dst->sin_len = sizeof(*dst);
2420                 dst->sin_addr = addr->v4;
2421                 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
2422                 rt = ro.ro_rt;
2423                 break;
2424 #endif /* INET */
2425 #ifdef INET6
2426         case AF_INET6:
2427                 hlen = sizeof(struct ip6_hdr);
2428                 bzero(&ro6, sizeof(ro6));
2429                 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
2430                 dst6->sin6_family = AF_INET6;
2431                 dst6->sin6_len = sizeof(*dst6);
2432                 dst6->sin6_addr = addr->v6;
2433                 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
2434                 rt = ro6.ro_rt;
2435                 break;
2436 #endif /* INET6 */
2437         }
2438
2439         if (rt && rt->rt_ifp) {
2440                 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
2441                 mss = max(tcp_mssdflt, mss);
2442                 RTFREE(rt);
2443         }
2444         mss = min(mss, offer);
2445         mss = max(mss, 64);             /* sanity - at least max opt space */
2446         return (mss);
2447 }
2448
2449 void
2450 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
2451 {
2452         struct pf_rule *r = s->rule.ptr;
2453
2454         s->rt_kif = NULL;
2455         if (!r->rt || r->rt == PF_FASTROUTE)
2456                 return;
2457         switch (s->af) {
2458 #ifdef INET
2459         case AF_INET:
2460                 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
2461                     &s->nat_src_node);
2462                 s->rt_kif = r->rpool.cur->kif;
2463                 break;
2464 #endif /* INET */
2465 #ifdef INET6
2466         case AF_INET6:
2467                 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
2468                     &s->nat_src_node);
2469                 s->rt_kif = r->rpool.cur->kif;
2470                 break;
2471 #endif /* INET6 */
2472         }
2473 }
2474
2475 int
2476 pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction,
2477     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2478     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
2479 {
2480         struct pf_rule          *nr = NULL;
2481         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
2482         struct tcphdr           *th = pd->hdr.tcp;
2483         u_int16_t                bport, nport = 0;
2484         sa_family_t              af = pd->af;
2485         int                      lookup = -1;
2486         uid_t                    uid;
2487         gid_t                    gid;
2488         struct pf_rule          *r, *a = NULL;
2489         struct pf_ruleset       *ruleset = NULL;
2490         struct pf_src_node      *nsn = NULL;
2491         u_short                  reason;
2492         int                      rewrite = 0;
2493         int                      tag = -1;
2494         u_int16_t                mss = tcp_mssdflt;
2495
2496         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2497
2498         if (direction == PF_OUT) {
2499                 bport = nport = th->th_sport;
2500                 /* check outgoing packet for BINAT/NAT */
2501                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2502                     saddr, th->th_sport, daddr, th->th_dport,
2503                     &pd->naddr, &nport)) != NULL) {
2504                         PF_ACPY(&pd->baddr, saddr, af);
2505                         pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
2506                             &th->th_sum, &pd->naddr, nport, 0, af);
2507                         rewrite++;
2508                         if (nr->natpass)
2509                                 r = NULL;
2510                         pd->nat_rule = nr;
2511                 }
2512         } else {
2513                 bport = nport = th->th_dport;
2514                 /* check incoming packet for BINAT/RDR */
2515                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
2516                     saddr, th->th_sport, daddr, th->th_dport,
2517                     &pd->naddr, &nport)) != NULL) {
2518                         PF_ACPY(&pd->baddr, daddr, af);
2519                         pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
2520                             &th->th_sum, &pd->naddr, nport, 0, af);
2521                         rewrite++;
2522                         if (nr->natpass)
2523                                 r = NULL;
2524                         pd->nat_rule = nr;
2525                 }
2526         }
2527
2528         while (r != NULL) {
2529                 r->evaluations++;
2530                 if (r->kif != NULL &&
2531                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
2532                         r = r->skip[PF_SKIP_IFP].ptr;
2533                 else if (r->direction && r->direction != direction)
2534                         r = r->skip[PF_SKIP_DIR].ptr;
2535                 else if (r->af && r->af != af)
2536                         r = r->skip[PF_SKIP_AF].ptr;
2537                 else if (r->proto && r->proto != IPPROTO_TCP)
2538                         r = r->skip[PF_SKIP_PROTO].ptr;
2539                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
2540                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
2541                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
2542                     r->src.port[0], r->src.port[1], th->th_sport))
2543                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
2544                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
2545                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2546                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
2547                     r->dst.port[0], r->dst.port[1], th->th_dport))
2548                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2549                 else if (r->tos && !(r->tos & pd->tos))
2550                         r = TAILQ_NEXT(r, entries);
2551                 else if (r->rule_flag & PFRULE_FRAGMENT)
2552                         r = TAILQ_NEXT(r, entries);
2553                 else if ((r->flagset & th->th_flags) != r->flags)
2554                         r = TAILQ_NEXT(r, entries);
2555                 else if (r->uid.op && (lookup != -1 || (lookup =
2556                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2557                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
2558                     uid))
2559                         r = TAILQ_NEXT(r, entries);
2560                 else if (r->gid.op && (lookup != -1 || (lookup =
2561                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2562                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
2563                     gid))
2564                         r = TAILQ_NEXT(r, entries);
2565                 else if (r->prob && r->prob <= karc4random())
2566                         r = TAILQ_NEXT(r, entries);
2567                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
2568                         r = TAILQ_NEXT(r, entries);
2569                 else if (r->anchorname[0] && r->anchor == NULL)
2570                         r = TAILQ_NEXT(r, entries);
2571                 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match(
2572                     pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint))
2573                         r = TAILQ_NEXT(r, entries);
2574                 else {
2575                         if (r->tag)
2576                                 tag = r->tag;
2577                         if (r->anchor == NULL) {
2578                                 *rm = r;
2579                                 *am = a;
2580                                 *rsm = ruleset;
2581                                 if ((*rm)->quick)
2582                                         break;
2583                                 r = TAILQ_NEXT(r, entries);
2584                         } else
2585                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
2586                                     PF_RULESET_FILTER);
2587                 }
2588                 if (r == NULL && a != NULL)
2589                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
2590                             PF_RULESET_FILTER);
2591         }
2592         r = *rm;
2593         a = *am;
2594         ruleset = *rsm;
2595
2596         REASON_SET(&reason, PFRES_MATCH);
2597
2598         if (r->log) {
2599                 if (rewrite)
2600                         m_copyback(m, off, sizeof(*th), (caddr_t)th);
2601                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
2602         }
2603
2604         if ((r->action == PF_DROP) &&
2605             ((r->rule_flag & PFRULE_RETURNRST) ||
2606             (r->rule_flag & PFRULE_RETURNICMP) ||
2607             (r->rule_flag & PFRULE_RETURN))) {
2608                 /* undo NAT changes, if they have taken place */
2609                 if (nr != NULL) {
2610                         if (direction == PF_OUT) {
2611                                 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
2612                                     &th->th_sum, &pd->baddr, bport, 0, af);
2613                                 rewrite++;
2614                         } else {
2615                                 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
2616                                     &th->th_sum, &pd->baddr, bport, 0, af);
2617                                 rewrite++;
2618                         }
2619                 }
2620                 if (((r->rule_flag & PFRULE_RETURNRST) ||
2621                     (r->rule_flag & PFRULE_RETURN)) &&
2622                     !(th->th_flags & TH_RST)) {
2623                         u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
2624
2625                         if (th->th_flags & TH_SYN)
2626                                 ack++;
2627                         if (th->th_flags & TH_FIN)
2628                                 ack++;
2629                         pf_send_tcp(r, af, pd->dst,
2630                             pd->src, th->th_dport, th->th_sport,
2631                             ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
2632                             r->return_ttl);
2633                 } else if ((af == AF_INET) && r->return_icmp)
2634                         pf_send_icmp(m, r->return_icmp >> 8,
2635                             r->return_icmp & 255, af, r);
2636                 else if ((af == AF_INET6) && r->return_icmp6)
2637                         pf_send_icmp(m, r->return_icmp6 >> 8,
2638                             r->return_icmp6 & 255, af, r);
2639         }
2640
2641         if (r->action == PF_DROP)
2642                 return (PF_DROP);
2643
2644         pf_tag_packet(m, tag);
2645
2646         if (r->keep_state || nr != NULL ||
2647             (pd->flags & PFDESC_TCP_NORM)) {
2648                 /* create new state */
2649                 u_int16_t        len;
2650                 struct pf_state *s = NULL;
2651                 struct pf_src_node *sn = NULL;
2652
2653                 len = pd->tot_len - off - (th->th_off << 2);
2654
2655                 /* check maximums */
2656                 if (r->max_states && (r->states >= r->max_states))
2657                         goto cleanup;
2658                 /* src node for flter rule */
2659                 if ((r->rule_flag & PFRULE_SRCTRACK ||
2660                     r->rpool.opts & PF_POOL_STICKYADDR) &&
2661                     pf_insert_src_node(&sn, r, saddr, af) != 0)
2662                         goto cleanup;
2663                 /* src node for translation rule */
2664                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
2665                     ((direction == PF_OUT &&
2666                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
2667                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
2668                         goto cleanup;
2669                 s = pool_get(&pf_state_pl, PR_NOWAIT);
2670                 if (s == NULL) {
2671 cleanup:
2672                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
2673                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
2674                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2675                                 pf_status.src_nodes--;
2676                                 pool_put(&pf_src_tree_pl, sn);
2677                         }
2678                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
2679                             nsn->expire == 0) {
2680                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
2681                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2682                                 pf_status.src_nodes--;
2683                                 pool_put(&pf_src_tree_pl, nsn);
2684                         }
2685                         REASON_SET(&reason, PFRES_MEMORY);
2686                         return (PF_DROP);
2687                 }
2688                 bzero(s, sizeof(*s));
2689                 r->states++;
2690                 if (a != NULL)
2691                         a->states++;
2692                 s->rule.ptr = r;
2693                 s->nat_rule.ptr = nr;
2694                 if (s->nat_rule.ptr != NULL)
2695                         s->nat_rule.ptr->states++;
2696                 s->anchor.ptr = a;
2697                 s->allow_opts = r->allow_opts;
2698                 s->log = r->log & 2;
2699                 s->proto = IPPROTO_TCP;
2700                 s->direction = direction;
2701                 s->af = af;
2702                 if (direction == PF_OUT) {
2703                         PF_ACPY(&s->gwy.addr, saddr, af);
2704                         s->gwy.port = th->th_sport;             /* sport */
2705                         PF_ACPY(&s->ext.addr, daddr, af);
2706                         s->ext.port = th->th_dport;
2707                         if (nr != NULL) {
2708                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
2709                                 s->lan.port = bport;
2710                         } else {
2711                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
2712                                 s->lan.port = s->gwy.port;
2713                         }
2714                 } else {
2715                         PF_ACPY(&s->lan.addr, daddr, af);
2716                         s->lan.port = th->th_dport;
2717                         PF_ACPY(&s->ext.addr, saddr, af);
2718                         s->ext.port = th->th_sport;
2719                         if (nr != NULL) {
2720                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
2721                                 s->gwy.port = bport;
2722                         } else {
2723                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
2724                                 s->gwy.port = s->lan.port;
2725                         }
2726                 }
2727
2728                 s->hash = pf_state_hash(s);
2729                 s->src.seqlo = ntohl(th->th_seq);
2730                 s->src.seqhi = s->src.seqlo + len + 1;
2731                 s->pickup_mode = r->pickup_mode;
2732
2733                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2734                     r->keep_state == PF_STATE_MODULATE) {
2735                         /* Generate sequence number modulator */
2736                         while ((s->src.seqdiff = karc4random()) == 0)
2737                                 ;
2738                         pf_change_a(&th->th_seq, &th->th_sum,
2739                             htonl(s->src.seqlo + s->src.seqdiff), 0);
2740                         rewrite = 1;
2741                 } else
2742                         s->src.seqdiff = 0;
2743
2744                 /*
2745                  * WARNING!  NetBSD patched this to not scale max_win up
2746                  * on the initial SYN, but they failed to correct the code
2747                  * in pf_test_state_tcp() that 'undid' the scaling, and they
2748                  * failed to remove the scale factor on successful window
2749                  * scale negotiation (and doing so would be difficult in the
2750                  * face of retransmission, without adding more flags to the
2751                  * state structure).
2752                  *
2753                  * After discussions with Daniel Hartmeier and Max Laier
2754                  * I've decided not to apply the NetBSD patch.
2755                  *
2756                  * The worst that happens is that the undo code on window
2757                  * scale negotiation failures will produce a larger
2758                  * max_win then actual.
2759                  */
2760                 if (th->th_flags & TH_SYN) {
2761                         s->src.seqhi++;
2762                         s->src.wscale = pf_get_wscale(m, off, th->th_off, af);
2763                         s->sync_flags |= PFSTATE_GOT_SYN1;
2764                 }
2765                 s->src.max_win = MAX(ntohs(th->th_win), 1);
2766                 if (s->src.wscale & PF_WSCALE_MASK) {
2767                         /* Remove scale factor from initial window */
2768                         u_int win = s->src.max_win;
2769                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
2770                         s->src.max_win = (win - 1) >>
2771                             (s->src.wscale & PF_WSCALE_MASK);
2772                 }
2773                 if (th->th_flags & TH_FIN)
2774                         s->src.seqhi++;
2775                 s->dst.seqhi = 1;
2776                 s->dst.max_win = 1;
2777                 s->src.state = TCPS_SYN_SENT;
2778                 s->dst.state = TCPS_CLOSED;
2779                 s->creation = time_second;
2780                 s->expire = time_second;
2781                 s->timeout = PFTM_TCP_FIRST_PACKET;
2782                 pf_set_rt_ifp(s, saddr);
2783                 if (sn != NULL) {
2784                         s->src_node = sn;
2785                         s->src_node->states++;
2786                 }
2787                 if (nsn != NULL) {
2788                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
2789                         s->nat_src_node = nsn;
2790                         s->nat_src_node->states++;
2791                 }
2792                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
2793                     off, pd, th, &s->src, &s->dst)) {
2794                         REASON_SET(&reason, PFRES_MEMORY);
2795                         pf_src_tree_remove_state(s);
2796                         pool_put(&pf_state_pl, s);
2797                         return (PF_DROP);
2798                 }
2799                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
2800                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, &s->src,
2801                     &s->dst, &rewrite)) {
2802                         pf_normalize_tcp_cleanup(s);
2803                         pf_src_tree_remove_state(s);
2804                         pool_put(&pf_state_pl, s);
2805                         return (PF_DROP);
2806                 }
2807                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
2808                         pf_normalize_tcp_cleanup(s);
2809                         REASON_SET(&reason, PFRES_MEMORY);
2810                         pf_src_tree_remove_state(s);
2811                         pool_put(&pf_state_pl, s);
2812                         return (PF_DROP);
2813                 } else
2814                         *sm = s;
2815                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2816                     r->keep_state == PF_STATE_SYNPROXY) {
2817                         s->src.state = PF_TCPS_PROXY_SRC;
2818                         if (nr != NULL) {
2819                                 if (direction == PF_OUT) {
2820                                         pf_change_ap(saddr, &th->th_sport,
2821                                             pd->ip_sum, &th->th_sum, &pd->baddr,
2822                                             bport, 0, af);
2823                                 } else {
2824                                         pf_change_ap(daddr, &th->th_dport,
2825                                             pd->ip_sum, &th->th_sum, &pd->baddr,
2826                                             bport, 0, af);
2827                                 }
2828                         }
2829                         s->src.seqhi = karc4random();
2830                         /* Find mss option */
2831                         mss = pf_get_mss(m, off, th->th_off, af);
2832                         mss = pf_calc_mss(saddr, af, mss);
2833                         mss = pf_calc_mss(daddr, af, mss);
2834                         s->src.mss = mss;
2835                         pf_send_tcp(r, af, daddr, saddr, th->th_dport,
2836                             th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
2837                             TH_SYN|TH_ACK, 0, s->src.mss, 0);
2838                         return (PF_SYNPROXY_DROP);
2839                 }
2840         }
2841
2842         /* copy back packet headers if we performed NAT operations */
2843         if (rewrite)
2844                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
2845
2846         return (PF_PASS);
2847 }
2848
2849 int
2850 pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction,
2851     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2852     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
2853 {
2854         struct pf_rule          *nr = NULL;
2855         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
2856         struct udphdr           *uh = pd->hdr.udp;
2857         u_int16_t                bport, nport = 0;
2858         sa_family_t              af = pd->af;
2859         int                      lookup = -1;
2860         uid_t                    uid;
2861         gid_t                    gid;
2862         struct pf_rule          *r, *a = NULL;
2863         struct pf_ruleset       *ruleset = NULL;
2864         struct pf_src_node      *nsn = NULL;
2865         u_short                  reason;
2866         int                      rewrite = 0;
2867         int                      tag = -1;
2868
2869         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2870
2871         if (direction == PF_OUT) {
2872                 bport = nport = uh->uh_sport;
2873                 /* check outgoing packet for BINAT/NAT */
2874                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2875                     saddr, uh->uh_sport, daddr, uh->uh_dport,
2876                     &pd->naddr, &nport)) != NULL) {
2877                         PF_ACPY(&pd->baddr, saddr, af);
2878                         pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2879                             &uh->uh_sum, &pd->naddr, nport, 1, af);
2880                         rewrite++;
2881                         if (nr->natpass)
2882                                 r = NULL;
2883                         pd->nat_rule = nr;
2884                 }
2885         } else {
2886                 bport = nport = uh->uh_dport;
2887                 /* check incoming packet for BINAT/RDR */
2888                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
2889                     saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr,
2890                     &nport)) != NULL) {
2891                         PF_ACPY(&pd->baddr, daddr, af);
2892                         pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2893                             &uh->uh_sum, &pd->naddr, nport, 1, af);
2894                         rewrite++;
2895                         if (nr->natpass)
2896                                 r = NULL;
2897                         pd->nat_rule = nr;
2898                 }
2899         }
2900
2901         while (r != NULL) {
2902                 r->evaluations++;
2903                 if (r->kif != NULL &&
2904                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
2905                         r = r->skip[PF_SKIP_IFP].ptr;
2906                 else if (r->direction && r->direction != direction)
2907                         r = r->skip[PF_SKIP_DIR].ptr;
2908                 else if (r->af && r->af != af)
2909                         r = r->skip[PF_SKIP_AF].ptr;
2910                 else if (r->proto && r->proto != IPPROTO_UDP)
2911                         r = r->skip[PF_SKIP_PROTO].ptr;
2912                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
2913                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
2914                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
2915                     r->src.port[0], r->src.port[1], uh->uh_sport))
2916                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
2917                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
2918                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2919                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
2920                     r->dst.port[0], r->dst.port[1], uh->uh_dport))
2921                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2922                 else if (r->tos && !(r->tos & pd->tos))
2923                         r = TAILQ_NEXT(r, entries);
2924                 else if (r->rule_flag & PFRULE_FRAGMENT)
2925                         r = TAILQ_NEXT(r, entries);
2926                 else if (r->uid.op && (lookup != -1 || (lookup =
2927                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2928                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
2929                     uid))
2930                         r = TAILQ_NEXT(r, entries);
2931                 else if (r->gid.op && (lookup != -1 || (lookup =
2932                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2933                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
2934                     gid))
2935                         r = TAILQ_NEXT(r, entries);
2936                 else if (r->prob && r->prob <= karc4random())
2937                         r = TAILQ_NEXT(r, entries);
2938                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
2939                         r = TAILQ_NEXT(r, entries);
2940                 else if (r->anchorname[0] && r->anchor == NULL)
2941                         r = TAILQ_NEXT(r, entries);
2942                 else if (r->os_fingerprint != PF_OSFP_ANY)
2943                         r = TAILQ_NEXT(r, entries);
2944                 else {
2945                         if (r->tag)
2946                                 tag = r->tag;
2947                         if (r->anchor == NULL) {
2948                                 *rm = r;
2949                                 *am = a;
2950                                 *rsm = ruleset;
2951                                 if ((*rm)->quick)
2952                                         break;
2953                                 r = TAILQ_NEXT(r, entries);
2954                         } else
2955                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
2956                                     PF_RULESET_FILTER);
2957                 }
2958                 if (r == NULL && a != NULL)
2959                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
2960                             PF_RULESET_FILTER);
2961         }
2962         r = *rm;
2963         a = *am;
2964         ruleset = *rsm;
2965
2966         REASON_SET(&reason, PFRES_MATCH);
2967
2968         if (r->log) {
2969                 if (rewrite)
2970                         m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
2971                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
2972         }
2973
2974         if ((r->action == PF_DROP) &&
2975             ((r->rule_flag & PFRULE_RETURNICMP) ||
2976             (r->rule_flag & PFRULE_RETURN))) {
2977                 /* undo NAT changes, if they have taken place */
2978                 if (nr != NULL) {
2979                         if (direction == PF_OUT) {
2980                                 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2981                                     &uh->uh_sum, &pd->baddr, bport, 1, af);
2982                                 rewrite++;
2983                         } else {
2984                                 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2985                                     &uh->uh_sum, &pd->baddr, bport, 1, af);
2986                                 rewrite++;
2987                         }
2988                 }
2989                 if ((af == AF_INET) && r->return_icmp)
2990                         pf_send_icmp(m, r->return_icmp >> 8,
2991                             r->return_icmp & 255, af, r);
2992                 else if ((af == AF_INET6) && r->return_icmp6)
2993                         pf_send_icmp(m, r->return_icmp6 >> 8,
2994                             r->return_icmp6 & 255, af, r);
2995         }
2996
2997         if (r->action == PF_DROP)
2998                 return (PF_DROP);
2999
3000         pf_tag_packet(m, tag);
3001
3002         if (r->keep_state || nr != NULL) {
3003                 /* create new state */
3004                 struct pf_state *s = NULL;
3005                 struct pf_src_node *sn = NULL;
3006
3007                 /* check maximums */
3008                 if (r->max_states && (r->states >= r->max_states))
3009                         goto cleanup;
3010                 /* src node for flter rule */
3011                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3012                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3013                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3014                         goto cleanup;
3015                 /* src node for translation rule */
3016                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3017                     ((direction == PF_OUT &&
3018                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3019                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3020                         goto cleanup;
3021                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3022                 if (s == NULL) {
3023 cleanup:
3024                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3025                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3026                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3027                                 pf_status.src_nodes--;
3028                                 pool_put(&pf_src_tree_pl, sn);
3029                         }
3030                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3031                             nsn->expire == 0) {
3032                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3033                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3034                                 pf_status.src_nodes--;
3035                                 pool_put(&pf_src_tree_pl, nsn);
3036                         }
3037                         REASON_SET(&reason, PFRES_MEMORY);
3038                         return (PF_DROP);
3039                 }
3040                 bzero(s, sizeof(*s));
3041                 r->states++;
3042                 if (a != NULL)
3043                         a->states++;
3044                 s->rule.ptr = r;
3045                 s->nat_rule.ptr = nr;
3046                 if (s->nat_rule.ptr != NULL)
3047                         s->nat_rule.ptr->states++;
3048                 s->anchor.ptr = a;
3049                 s->allow_opts = r->allow_opts;
3050                 s->log = r->log & 2;
3051                 s->proto = IPPROTO_UDP;
3052                 s->direction = direction;
3053                 s->af = af;
3054                 if (direction == PF_OUT) {
3055                         PF_ACPY(&s->gwy.addr, saddr, af);
3056                         s->gwy.port = uh->uh_sport;
3057                         PF_ACPY(&s->ext.addr, daddr, af);
3058                         s->ext.port = uh->uh_dport;
3059                         if (nr != NULL) {
3060                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3061                                 s->lan.port = bport;
3062                         } else {
3063                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3064                                 s->lan.port = s->gwy.port;
3065                         }
3066                 } else {
3067                         PF_ACPY(&s->lan.addr, daddr, af);
3068                         s->lan.port = uh->uh_dport;
3069                         PF_ACPY(&s->ext.addr, saddr, af);
3070                         s->ext.port = uh->uh_sport;
3071                         if (nr != NULL) {
3072                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3073                                 s->gwy.port = bport;
3074                         } else {
3075                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3076                                 s->gwy.port = s->lan.port;
3077                         }
3078                 }
3079                 s->hash = pf_state_hash(s);
3080                 s->src.state = PFUDPS_SINGLE;
3081                 s->dst.state = PFUDPS_NO_TRAFFIC;
3082                 s->creation = time_second;
3083                 s->expire = time_second;
3084                 s->timeout = PFTM_UDP_FIRST_PACKET;
3085                 pf_set_rt_ifp(s, saddr);
3086                 if (sn != NULL) {
3087                         s->src_node = sn;
3088                         s->src_node->states++;
3089                 }
3090                 if (nsn != NULL) {
3091                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3092                         s->nat_src_node = nsn;
3093                         s->nat_src_node->states++;
3094                 }
3095                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3096                         REASON_SET(&reason, PFRES_MEMORY);
3097                         pf_src_tree_remove_state(s);
3098                         pool_put(&pf_state_pl, s);
3099                         return (PF_DROP);
3100                 } else
3101                         *sm = s;
3102         }
3103
3104         /* copy back packet headers if we performed NAT operations */
3105         if (rewrite)
3106                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
3107
3108         return (PF_PASS);
3109 }
3110
3111 int
3112 pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction,
3113     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3114     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
3115 {
3116         struct pf_rule          *nr = NULL;
3117         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3118         struct pf_rule          *r, *a = NULL;
3119         struct pf_ruleset       *ruleset = NULL;
3120         struct pf_src_node      *nsn = NULL;
3121         u_short                  reason;
3122         u_int16_t                icmpid = 0;
3123         sa_family_t              af = pd->af;
3124         u_int8_t                 icmptype = 0, icmpcode = 0;
3125         int                      state_icmp = 0;
3126         int                      tag = -1;
3127 #ifdef INET6
3128         int                      rewrite = 0;
3129 #endif /* INET6 */
3130
3131         switch (pd->proto) {
3132 #ifdef INET
3133         case IPPROTO_ICMP:
3134                 icmptype = pd->hdr.icmp->icmp_type;
3135                 icmpcode = pd->hdr.icmp->icmp_code;
3136                 icmpid = pd->hdr.icmp->icmp_id;
3137
3138                 if (icmptype == ICMP_UNREACH ||
3139                     icmptype == ICMP_SOURCEQUENCH ||
3140                     icmptype == ICMP_REDIRECT ||
3141                     icmptype == ICMP_TIMXCEED ||
3142                     icmptype == ICMP_PARAMPROB)
3143                         state_icmp++;
3144                 break;
3145 #endif /* INET */
3146 #ifdef INET6
3147         case IPPROTO_ICMPV6:
3148                 icmptype = pd->hdr.icmp6->icmp6_type;
3149                 icmpcode = pd->hdr.icmp6->icmp6_code;
3150                 icmpid = pd->hdr.icmp6->icmp6_id;
3151
3152                 if (icmptype == ICMP6_DST_UNREACH ||
3153                     icmptype == ICMP6_PACKET_TOO_BIG ||
3154                     icmptype == ICMP6_TIME_EXCEEDED ||
3155                     icmptype == ICMP6_PARAM_PROB)
3156                         state_icmp++;
3157                 break;
3158 #endif /* INET6 */
3159         }
3160
3161         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3162
3163         if (direction == PF_OUT) {
3164                 /* check outgoing packet for BINAT/NAT */
3165                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3166                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3167                         PF_ACPY(&pd->baddr, saddr, af);
3168                         switch (af) {
3169 #ifdef INET
3170                         case AF_INET:
3171                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3172                                     pd->naddr.v4.s_addr, 0);
3173                                 break;
3174 #endif /* INET */
3175 #ifdef INET6
3176                         case AF_INET6:
3177                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3178                                     &pd->naddr, 0);
3179                                 rewrite++;
3180                                 break;
3181 #endif /* INET6 */
3182                         }
3183                         if (nr->natpass)
3184                                 r = NULL;
3185                         pd->nat_rule = nr;
3186                 }
3187         } else {
3188                 /* check incoming packet for BINAT/RDR */
3189                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3190                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3191                         PF_ACPY(&pd->baddr, daddr, af);
3192                         switch (af) {
3193 #ifdef INET
3194                         case AF_INET:
3195                                 pf_change_a(&daddr->v4.s_addr,
3196                                     pd->ip_sum, pd->naddr.v4.s_addr, 0);
3197                                 break;
3198 #endif /* INET */
3199 #ifdef INET6
3200                         case AF_INET6:
3201                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3202                                     &pd->naddr, 0);
3203                                 rewrite++;
3204                                 break;
3205 #endif /* INET6 */
3206                         }
3207                         if (nr->natpass)
3208                                 r = NULL;
3209                         pd->nat_rule = nr;
3210                 }
3211         }
3212
3213         while (r != NULL) {
3214                 r->evaluations++;
3215                 if (r->kif != NULL &&
3216                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3217                         r = r->skip[PF_SKIP_IFP].ptr;
3218                 else if (r->direction && r->direction != direction)
3219                         r = r->skip[PF_SKIP_DIR].ptr;
3220                 else if (r->af && r->af != af)
3221                         r = r->skip[PF_SKIP_AF].ptr;
3222                 else if (r->proto && r->proto != pd->proto)
3223                         r = r->skip[PF_SKIP_PROTO].ptr;
3224                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
3225                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3226                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
3227                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3228                 else if (r->type && r->type != icmptype + 1)
3229                         r = TAILQ_NEXT(r, entries);
3230                 else if (r->code && r->code != icmpcode + 1)
3231                         r = TAILQ_NEXT(r, entries);
3232                 else if (r->tos && !(r->tos & pd->tos))
3233                         r = TAILQ_NEXT(r, entries);
3234                 else if (r->rule_flag & PFRULE_FRAGMENT)
3235                         r = TAILQ_NEXT(r, entries);
3236                 else if (r->prob && r->prob <= karc4random())
3237                         r = TAILQ_NEXT(r, entries);
3238                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3239                         r = TAILQ_NEXT(r, entries);
3240                 else if (r->anchorname[0] && r->anchor == NULL)
3241                         r = TAILQ_NEXT(r, entries);
3242                 else if (r->os_fingerprint != PF_OSFP_ANY)
3243                         r = TAILQ_NEXT(r, entries);
3244                 else {
3245                         if (r->tag)
3246                                 tag = r->tag;
3247                         if (r->anchor == NULL) {
3248                                 *rm = r;
3249                                 *am = a;
3250                                 *rsm = ruleset;
3251                                 if ((*rm)->quick)
3252                                         break;
3253                                 r = TAILQ_NEXT(r, entries);
3254                         } else
3255                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3256                                     PF_RULESET_FILTER);
3257                 }
3258                 if (r == NULL && a != NULL)
3259                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3260                             PF_RULESET_FILTER);
3261         }
3262         r = *rm;
3263         a = *am;
3264         ruleset = *rsm;
3265
3266         REASON_SET(&reason, PFRES_MATCH);
3267
3268         if (r->log) {
3269 #ifdef INET6
3270                 if (rewrite)
3271                         m_copyback(m, off, sizeof(struct icmp6_hdr),
3272                             (caddr_t)pd->hdr.icmp6);
3273 #endif /* INET6 */
3274                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3275         }
3276
3277         if (r->action != PF_PASS)
3278                 return (PF_DROP);
3279
3280         pf_tag_packet(m, tag);
3281
3282         if (!state_icmp && (r->keep_state || nr != NULL)) {
3283                 /* create new state */
3284                 struct pf_state *s = NULL;
3285                 struct pf_src_node *sn = NULL;
3286
3287                 /* check maximums */
3288                 if (r->max_states && (r->states >= r->max_states))
3289                         goto cleanup;
3290                 /* src node for flter rule */
3291                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3292                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3293                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3294                         goto cleanup;
3295                 /* src node for translation rule */
3296                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3297                     ((direction == PF_OUT &&
3298                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3299                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3300                         goto cleanup;
3301                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3302                 if (s == NULL) {
3303 cleanup:
3304                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3305                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3306                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3307                                 pf_status.src_nodes--;
3308                                 pool_put(&pf_src_tree_pl, sn);
3309                         }
3310                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3311                             nsn->expire == 0) {
3312                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3313                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3314                                 pf_status.src_nodes--;
3315                                 pool_put(&pf_src_tree_pl, nsn);
3316                         }
3317                         REASON_SET(&reason, PFRES_MEMORY);
3318                         return (PF_DROP);
3319                 }
3320                 bzero(s, sizeof(*s));
3321                 r->states++;
3322                 if (a != NULL)
3323                         a->states++;
3324                 s->rule.ptr = r;
3325                 s->nat_rule.ptr = nr;
3326                 if (s->nat_rule.ptr != NULL)
3327                         s->nat_rule.ptr->states++;
3328                 s->anchor.ptr = a;
3329                 s->allow_opts = r->allow_opts;
3330                 s->log = r->log & 2;
3331                 s->proto = pd->proto;
3332                 s->direction = direction;
3333                 s->af = af;
3334                 if (direction == PF_OUT) {
3335                         PF_ACPY(&s->gwy.addr, saddr, af);
3336                         s->gwy.port = icmpid;
3337                         PF_ACPY(&s->ext.addr, daddr, af);
3338                         s->ext.port = icmpid;
3339                         if (nr != NULL)
3340                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3341                         else
3342                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3343                         s->lan.port = icmpid;
3344                 } else {
3345                         PF_ACPY(&s->lan.addr, daddr, af);
3346                         s->lan.port = icmpid;
3347                         PF_ACPY(&s->ext.addr, saddr, af);
3348                         s->ext.port = icmpid;
3349                         if (nr != NULL)
3350                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3351                         else
3352                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3353                         s->gwy.port = icmpid;
3354                 }
3355                 s->hash = pf_state_hash(s);
3356                 s->creation = time_second;
3357                 s->expire = time_second;
3358                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3359                 pf_set_rt_ifp(s, saddr);
3360                 if (sn != NULL) {
3361                         s->src_node = sn;
3362                         s->src_node->states++;
3363                 }
3364                 if (nsn != NULL) {
3365                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3366                         s->nat_src_node = nsn;
3367                         s->nat_src_node->states++;
3368                 }
3369                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3370                         REASON_SET(&reason, PFRES_MEMORY);
3371                         pf_src_tree_remove_state(s);
3372                         pool_put(&pf_state_pl, s);
3373                         return (PF_DROP);
3374                 } else
3375                         *sm = s;
3376         }
3377
3378 #ifdef INET6
3379         /* copy back packet headers if we performed IPv6 NAT operations */
3380         if (rewrite)
3381                 m_copyback(m, off, sizeof(struct icmp6_hdr),
3382                     (caddr_t)pd->hdr.icmp6);
3383 #endif /* INET6 */
3384
3385         return (PF_PASS);
3386 }
3387
3388 int
3389 pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction,
3390     struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3391     struct pf_rule **am, struct pf_ruleset **rsm)
3392 {
3393         struct pf_rule          *nr = NULL;
3394         struct pf_rule          *r, *a = NULL;
3395         struct pf_ruleset       *ruleset = NULL;
3396         struct pf_src_node      *nsn = NULL;
3397         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3398         sa_family_t              af = pd->af;
3399         u_short                  reason;
3400         int                      tag = -1;
3401
3402         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3403
3404         if (direction == PF_OUT) {
3405                 /* check outgoing packet for BINAT/NAT */
3406                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3407                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3408                         PF_ACPY(&pd->baddr, saddr, af);
3409                         switch (af) {
3410 #ifdef INET
3411                         case AF_INET:
3412                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3413                                     pd->naddr.v4.s_addr, 0);
3414                                 break;
3415 #endif /* INET */
3416 #ifdef INET6
3417                         case AF_INET6:
3418                                 PF_ACPY(saddr, &pd->naddr, af);
3419                                 break;
3420 #endif /* INET6 */
3421                         }
3422                         if (nr->natpass)
3423                                 r = NULL;
3424                         pd->nat_rule = nr;
3425                 }
3426         } else {
3427                 /* check incoming packet for BINAT/RDR */
3428                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3429                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3430                         PF_ACPY(&pd->baddr, daddr, af);
3431                         switch (af) {
3432 #ifdef INET
3433                         case AF_INET:
3434                                 pf_change_a(&daddr->v4.s_addr,
3435                                     pd->ip_sum, pd->naddr.v4.s_addr, 0);
3436                                 break;
3437 #endif /* INET */
3438 #ifdef INET6
3439                         case AF_INET6:
3440                                 PF_ACPY(daddr, &pd->naddr, af);
3441                                 break;
3442 #endif /* INET6 */
3443                         }
3444                         if (nr->natpass)
3445                                 r = NULL;
3446                         pd->nat_rule = nr;
3447                 }
3448         }
3449
3450         while (r != NULL) {
3451                 r->evaluations++;
3452                 if (r->kif != NULL &&
3453                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3454                         r = r->skip[PF_SKIP_IFP].ptr;
3455                 else if (r->direction && r->direction != direction)
3456                         r = r->skip[PF_SKIP_DIR].ptr;
3457                 else if (r->af && r->af != af)
3458                         r = r->skip[PF_SKIP_AF].ptr;
3459                 else if (r->proto && r->proto != pd->proto)
3460                         r = r->skip[PF_SKIP_PROTO].ptr;
3461                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3462                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3463                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3464                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3465                 else if (r->tos && !(r->tos & pd->tos))
3466                         r = TAILQ_NEXT(r, entries);
3467                 else if (r->rule_flag & PFRULE_FRAGMENT)
3468                         r = TAILQ_NEXT(r, entries);
3469                 else if (r->prob && r->prob <= karc4random())
3470                         r = TAILQ_NEXT(r, entries);
3471                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3472                         r = TAILQ_NEXT(r, entries);
3473                 else if (r->anchorname[0] && r->anchor == NULL)
3474                         r = TAILQ_NEXT(r, entries);
3475                 else if (r->os_fingerprint != PF_OSFP_ANY)
3476                         r = TAILQ_NEXT(r, entries);
3477                 else {
3478                         if (r->tag)
3479                                 tag = r->tag;
3480                         if (r->anchor == NULL) {
3481                                 *rm = r;
3482                                 *am = a;
3483                                 *rsm = ruleset;
3484                                 if ((*rm)->quick)
3485                                         break;
3486                                 r = TAILQ_NEXT(r, entries);
3487                         } else
3488                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3489                                     PF_RULESET_FILTER);
3490                 }
3491                 if (r == NULL && a != NULL)
3492                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3493                             PF_RULESET_FILTER);
3494         }
3495         r = *rm;
3496         a = *am;
3497         ruleset = *rsm;
3498
3499         REASON_SET(&reason, PFRES_MATCH);
3500
3501         if (r->log)
3502                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3503
3504         if ((r->action == PF_DROP) &&
3505             ((r->rule_flag & PFRULE_RETURNICMP) ||
3506             (r->rule_flag & PFRULE_RETURN))) {
3507                 struct pf_addr *a = NULL;
3508
3509                 if (nr != NULL) {
3510                         if (direction == PF_OUT)
3511                                 a = saddr;
3512                         else
3513                                 a = daddr;
3514                 }
3515                 if (a != NULL) {
3516                         switch (af) {
3517 #ifdef INET
3518                         case AF_INET:
3519                                 pf_change_a(&a->v4.s_addr, pd->ip_sum,
3520                                     pd->baddr.v4.s_addr, 0);
3521                                 break;
3522 #endif /* INET */
3523 #ifdef INET6
3524                         case AF_INET6:
3525                                 PF_ACPY(a, &pd->baddr, af);
3526                                 break;
3527 #endif /* INET6 */
3528                         }
3529                 }
3530                 if ((af == AF_INET) && r->return_icmp)
3531                         pf_send_icmp(m, r->return_icmp >> 8,
3532                             r->return_icmp & 255, af, r);
3533                 else if ((af == AF_INET6) && r->return_icmp6)
3534                         pf_send_icmp(m, r->return_icmp6 >> 8,
3535                             r->return_icmp6 & 255, af, r);
3536         }
3537
3538         if (r->action != PF_PASS)
3539                 return (PF_DROP);
3540
3541         pf_tag_packet(m, tag);
3542
3543         if (r->keep_state || nr != NULL) {
3544                 /* create new state */
3545                 struct pf_state *s = NULL;
3546                 struct pf_src_node *sn = NULL;
3547
3548                 /* check maximums */
3549                 if (r->max_states && (r->states >= r->max_states))
3550                         goto cleanup;
3551                 /* src node for flter rule */
3552                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3553                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3554                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3555                         goto cleanup;
3556                 /* src node for translation rule */
3557                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3558                     ((direction == PF_OUT &&
3559                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3560                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3561                         goto cleanup;
3562                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3563                 if (s == NULL) {
3564 cleanup:
3565                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3566                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3567                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3568                                 pf_status.src_nodes--;
3569                                 pool_put(&pf_src_tree_pl, sn);
3570                         }
3571                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3572                             nsn->expire == 0) {
3573                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3574                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3575                                 pf_status.src_nodes--;
3576                                 pool_put(&pf_src_tree_pl, nsn);
3577                         }
3578                         REASON_SET(&reason, PFRES_MEMORY);
3579                         return (PF_DROP);
3580                 }
3581                 bzero(s, sizeof(*s));
3582                 r->states++;
3583                 if (a != NULL)
3584                         a->states++;
3585                 s->rule.ptr = r;
3586                 s->nat_rule.ptr = nr;
3587                 if (s->nat_rule.ptr != NULL)
3588                         s->nat_rule.ptr->states++;
3589                 s->anchor.ptr = a;
3590                 s->allow_opts = r->allow_opts;
3591                 s->log = r->log & 2;
3592                 s->proto = pd->proto;
3593                 s->direction = direction;
3594                 s->af = af;
3595                 if (direction == PF_OUT) {
3596                         PF_ACPY(&s->gwy.addr, saddr, af);
3597                         PF_ACPY(&s->ext.addr, daddr, af);
3598                         if (nr != NULL)
3599                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3600                         else
3601                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3602                 } else {
3603                         PF_ACPY(&s->lan.addr, daddr, af);
3604                         PF_ACPY(&s->ext.addr, saddr, af);
3605                         if (nr != NULL)
3606                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3607                         else
3608                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3609                 }
3610                 s->hash = pf_state_hash(s);
3611                 s->src.state = PFOTHERS_SINGLE;
3612                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3613                 s->creation = time_second;
3614                 s->expire = time_second;
3615                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3616                 pf_set_rt_ifp(s, saddr);
3617                 if (sn != NULL) {
3618                         s->src_node = sn;
3619                         s->src_node->states++;
3620                 }
3621                 if (nsn != NULL) {
3622                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3623                         s->nat_src_node = nsn;
3624                         s->nat_src_node->states++;
3625                 }
3626                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3627                         REASON_SET(&reason, PFRES_MEMORY);
3628                         pf_src_tree_remove_state(s);
3629                         pool_put(&pf_state_pl, s);
3630                         return (PF_DROP);
3631                 } else
3632                         *sm = s;
3633         }
3634
3635         return (PF_PASS);
3636 }
3637
3638 int
3639 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3640     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3641     struct pf_ruleset **rsm)
3642 {
3643         struct pf_rule          *r, *a = NULL;
3644         struct pf_ruleset       *ruleset = NULL;
3645         sa_family_t              af = pd->af;
3646         u_short                  reason;
3647         int                      tag = -1;
3648
3649         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3650         while (r != NULL) {
3651                 r->evaluations++;
3652                 if (r->kif != NULL &&
3653                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3654                         r = r->skip[PF_SKIP_IFP].ptr;
3655                 else if (r->direction && r->direction != direction)
3656                         r = r->skip[PF_SKIP_DIR].ptr;
3657                 else if (r->af && r->af != af)
3658                         r = r->skip[PF_SKIP_AF].ptr;
3659                 else if (r->proto && r->proto != pd->proto)
3660                         r = r->skip[PF_SKIP_PROTO].ptr;
3661                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3662                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3663                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3664                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3665                 else if (r->tos && !(r->tos & pd->tos))
3666                         r = TAILQ_NEXT(r, entries);
3667                 else if (r->os_fingerprint != PF_OSFP_ANY)
3668                         r = TAILQ_NEXT(r, entries);
3669                 else if (pd->proto == IPPROTO_UDP &&
3670                     (r->src.port_op || r->dst.port_op))
3671                         r = TAILQ_NEXT(r, entries);
3672                 else if (pd->proto == IPPROTO_TCP &&
3673                     (r->src.port_op || r->dst.port_op || r->flagset))
3674                         r = TAILQ_NEXT(r, entries);
3675                 else if ((pd->proto == IPPROTO_ICMP ||
3676                     pd->proto == IPPROTO_ICMPV6) &&
3677                     (r->type || r->code))
3678                         r = TAILQ_NEXT(r, entries);
3679                 else if (r->prob && r->prob <= karc4random())
3680                         r = TAILQ_NEXT(r, entries);
3681                 else if (r->match_tag && !pf_match_tag(m, r, NULL, &tag))
3682                         r = TAILQ_NEXT(r, entries);
3683                 else if (r->anchorname[0] && r->anchor == NULL)
3684                         r = TAILQ_NEXT(r, entries);
3685                 else {
3686                         if (r->anchor == NULL) {
3687                                 *rm = r;
3688                                 *am = a;
3689                                 *rsm = ruleset;
3690                                 if ((*rm)->quick)
3691                                         break;
3692                                 r = TAILQ_NEXT(r, entries);
3693                         } else
3694                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3695                                     PF_RULESET_FILTER);
3696                 }
3697                 if (r == NULL && a != NULL)
3698                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3699                             PF_RULESET_FILTER);
3700         }
3701         r = *rm;
3702         a = *am;
3703         ruleset = *rsm;
3704
3705         REASON_SET(&reason, PFRES_MATCH);
3706
3707         if (r->log)
3708                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3709
3710         if (r->action != PF_PASS)
3711                 return (PF_DROP);
3712
3713         pf_tag_packet(m, tag);
3714
3715         return (PF_PASS);
3716 }
3717
3718 int
3719 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
3720     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3721     u_short *reason)
3722 {
3723         struct pf_state          key;
3724         struct tcphdr           *th = pd->hdr.tcp;
3725         u_int16_t                win = ntohs(th->th_win);
3726         u_int32_t                ack, end, seq;
3727         u_int8_t                 sws, dws;
3728         int                      ackskew;
3729         int                      copyback = 0;
3730         struct pf_state_peer    *src, *dst;
3731
3732         key.af = pd->af;
3733         key.proto = IPPROTO_TCP;
3734         if (direction == PF_IN) {
3735                 PF_ACPY(&key.ext.addr, pd->src, key.af);
3736                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
3737                 key.ext.port = th->th_sport;
3738                 key.gwy.port = th->th_dport;
3739         } else {
3740                 PF_ACPY(&key.lan.addr, pd->src, key.af);
3741                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
3742                 key.lan.port = th->th_sport;
3743                 key.ext.port = th->th_dport;
3744         }
3745
3746         STATE_LOOKUP();
3747
3748         if (direction == (*state)->direction) {
3749                 src = &(*state)->src;
3750                 dst = &(*state)->dst;
3751         } else {
3752                 src = &(*state)->dst;
3753                 dst = &(*state)->src;
3754         }
3755
3756         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
3757                 if (direction != (*state)->direction)
3758                         return (PF_SYNPROXY_DROP);
3759                 if (th->th_flags & TH_SYN) {
3760                         if (ntohl(th->th_seq) != (*state)->src.seqlo)
3761                                 return (PF_DROP);
3762                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3763                             pd->src, th->th_dport, th->th_sport,
3764                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
3765                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0);
3766                         return (PF_SYNPROXY_DROP);
3767                 } else if (!(th->th_flags & TH_ACK) ||
3768                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3769                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3770                         return (PF_DROP);
3771                 else
3772                         (*state)->src.state = PF_TCPS_PROXY_DST;
3773         }
3774         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
3775                 struct pf_state_host *src, *dst;
3776
3777                 if (direction == PF_OUT) {
3778                         src = &(*state)->gwy;
3779                         dst = &(*state)->ext;
3780                 } else {
3781                         src = &(*state)->ext;
3782                         dst = &(*state)->lan;
3783                 }
3784                 if (direction == (*state)->direction) {
3785                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
3786                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3787                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3788                                 return (PF_DROP);
3789                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
3790                         if ((*state)->dst.seqhi == 1)
3791                                 (*state)->dst.seqhi = karc4random();
3792                         pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3793                             &dst->addr, src->port, dst->port,
3794                             (*state)->dst.seqhi, 0, TH_SYN, 0,
3795                             (*state)->src.mss, 0);
3796                         return (PF_SYNPROXY_DROP);
3797                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
3798                     (TH_SYN|TH_ACK)) ||
3799                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1))
3800                         return (PF_DROP);
3801                 else {
3802                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
3803                         (*state)->dst.seqlo = ntohl(th->th_seq);
3804                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3805                             pd->src, th->th_dport, th->th_sport,
3806                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
3807                             TH_ACK, (*state)->src.max_win, 0, 0);
3808                         pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3809                             &dst->addr, src->port, dst->port,
3810                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
3811                             TH_ACK, (*state)->dst.max_win, 0, 0);
3812                         (*state)->src.seqdiff = (*state)->dst.seqhi -
3813                             (*state)->src.seqlo;
3814                         (*state)->dst.seqdiff = (*state)->src.seqhi -
3815                             (*state)->dst.seqlo;
3816                         (*state)->src.seqhi = (*state)->src.seqlo +
3817                             (*state)->dst.max_win;
3818                         (*state)->dst.seqhi = (*state)->dst.seqlo +
3819                             (*state)->src.max_win;
3820                         (*state)->src.wscale = (*state)->dst.wscale = 0;
3821                         (*state)->src.state = (*state)->dst.state =
3822                             TCPS_ESTABLISHED;
3823                         return (PF_SYNPROXY_DROP);
3824                 }
3825         }
3826
3827         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3828                 sws = src->wscale & PF_WSCALE_MASK;
3829                 dws = dst->wscale & PF_WSCALE_MASK;
3830         } else
3831                 sws = dws = 0;
3832
3833         /*
3834          * Sequence tracking algorithm from Guido van Rooij's paper:
3835          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3836          *      tcp_filtering.ps
3837          */
3838
3839         seq = ntohl(th->th_seq);
3840         if (src->seqlo == 0) {
3841                 /*
3842                  * First packet from this end.  The other end has already set
3843                  * the seqlo field.  Set its state.
3844                  */
3845                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3846                     src->scrub == NULL) {
3847                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3848                                 REASON_SET(reason, PFRES_MEMORY);
3849                                 return (PF_DROP);
3850                         }
3851                 }
3852
3853                 /* Deferred generation of sequence number modulator */
3854                 if (dst->seqdiff && !src->seqdiff) {
3855                         while ((src->seqdiff = karc4random()) == 0)
3856                                 ;
3857                         ack = ntohl(th->th_ack) - dst->seqdiff;
3858                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3859                             src->seqdiff), 0);
3860                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3861                         copyback = 1;
3862                 } else {
3863                         ack = ntohl(th->th_ack);
3864                 }
3865
3866                 end = seq + pd->p_len;
3867                 if (th->th_flags & TH_SYN) {
3868                         end++;
3869                         (*state)->sync_flags |= PFSTATE_GOT_SYN2;
3870                         if (dst->wscale & PF_WSCALE_FLAG) {
3871                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3872                                     pd->af);
3873                                 if (src->wscale & PF_WSCALE_FLAG) {
3874                                         /* Remove scale factor from initial
3875                                          * window */
3876                                         sws = src->wscale & PF_WSCALE_MASK;
3877                                         win = ((u_int32_t)win + (1 << sws) - 1)
3878                                             >> sws;
3879                                         dws = dst->wscale & PF_WSCALE_MASK;
3880                                 } else {
3881                                         /*
3882                                          * Fixup other window.  Undo the
3883                                          * normalization that was done on
3884                                          * the initial SYN.  This can result
3885                                          * in max_win being larger then
3886                                          * actual but we don't really have
3887                                          * much of a choice.
3888                                          */
3889                                         dst->max_win <<= dst->wscale &
3890                                             PF_WSCALE_MASK;
3891                                         /* in case of a retrans SYN|ACK */
3892                                         dst->wscale = 0;
3893                                 }
3894                         }
3895                 }
3896                 if (th->th_flags & TH_FIN)
3897                         end++;
3898
3899                 src->seqlo = seq;
3900                 if (src->state < TCPS_SYN_SENT)
3901                         src->state = TCPS_SYN_SENT;
3902
3903                 /*
3904                  * May need to slide the window (seqhi may have been set by
3905                  * the crappy stack check or if we picked up the connection
3906                  * after establishment)
3907                  */
3908                 if (src->seqhi == 1 ||
3909                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3910                         src->seqhi = end + MAX(1, dst->max_win << dws);
3911                 if (win > src->max_win)
3912                         src->max_win = win;
3913
3914         } else {
3915                 ack = ntohl(th->th_ack) - dst->seqdiff;
3916                 if (src->seqdiff) {
3917                         /* Modulate sequence numbers */
3918                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3919                             src->seqdiff), 0);
3920                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3921                         copyback = 1;
3922                 }
3923                 end = seq + pd->p_len;
3924                 if (th->th_flags & TH_SYN)
3925                         end++;
3926                 if (th->th_flags & TH_FIN)
3927                         end++;
3928         }
3929
3930         if ((th->th_flags & TH_ACK) == 0) {
3931                 /* Let it pass through the ack skew check */
3932                 ack = dst->seqlo;
3933         } else if ((ack == 0 &&
3934             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3935             /* broken tcp stacks do not set ack */
3936             (dst->state < TCPS_SYN_SENT)) {
3937                 /*
3938                  * Many stacks (ours included) will set the ACK number in an
3939                  * FIN|ACK if the SYN times out -- no sequence to ACK.
3940                  */
3941                 ack = dst->seqlo;
3942         }
3943
3944         if (seq == end) {
3945                 /* Ease sequencing restrictions on no data packets */
3946                 seq = src->seqlo;
3947                 end = seq;
3948         }
3949
3950         ackskew = dst->seqlo - ack;
3951
3952 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
3953
3954         if (SEQ_GEQ(src->seqhi, end) &&
3955             /* Last octet inside other's window space */
3956             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
3957             /* Retrans: not more than one window back */
3958             (ackskew >= -MAXACKWINDOW) &&
3959             /* Acking not more than one reassembled fragment backwards */
3960             (ackskew <= (MAXACKWINDOW << sws))) {
3961             /* Acking not more than one window forward */
3962
3963                 /* update max window */
3964                 if (src->max_win < win)
3965                         src->max_win = win;
3966                 /* synchronize sequencing */
3967                 if (SEQ_GT(end, src->seqlo))
3968                         src->seqlo = end;
3969                 /* slide the window of what the other end can send */
3970                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
3971                         dst->seqhi = ack + MAX((win << sws), 1);
3972
3973
3974                 /* update states */
3975                 if (th->th_flags & TH_SYN)
3976                         if (src->state < TCPS_SYN_SENT)
3977                                 src->state = TCPS_SYN_SENT;
3978                 if (th->th_flags & TH_FIN)
3979                         if (src->state < TCPS_CLOSING)
3980                                 src->state = TCPS_CLOSING;
3981                 if (th->th_flags & TH_ACK) {
3982                         if (dst->state == TCPS_SYN_SENT)
3983                                 dst->state = TCPS_ESTABLISHED;
3984                         else if (dst->state == TCPS_CLOSING)
3985                                 dst->state = TCPS_FIN_WAIT_2;
3986                 }
3987                 if (th->th_flags & TH_RST)
3988                         src->state = dst->state = TCPS_TIME_WAIT;
3989
3990                 /* update expire time */
3991                 (*state)->expire = time_second;
3992                 if (src->state >= TCPS_FIN_WAIT_2 &&
3993                     dst->state >= TCPS_FIN_WAIT_2)
3994                         (*state)->timeout = PFTM_TCP_CLOSED;
3995                 else if (src->state >= TCPS_FIN_WAIT_2 ||
3996                     dst->state >= TCPS_FIN_WAIT_2)
3997                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
3998                 else if (src->state < TCPS_ESTABLISHED ||
3999                     dst->state < TCPS_ESTABLISHED)
4000                         (*state)->timeout = PFTM_TCP_OPENING;
4001                 else if (src->state >= TCPS_CLOSING ||
4002                     dst->state >= TCPS_CLOSING)
4003                         (*state)->timeout = PFTM_TCP_CLOSING;
4004                 else
4005                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4006
4007                 /* Fall through to PASS packet */
4008
4009         } else if ((dst->state < TCPS_SYN_SENT ||
4010                 dst->state >= TCPS_FIN_WAIT_2 ||
4011                 src->state >= TCPS_FIN_WAIT_2) &&
4012             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4013             /* Within a window forward of the originating packet */
4014             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4015             /* Within a window backward of the originating packet */
4016
4017                 /*
4018                  * This currently handles three situations:
4019                  *  1) Stupid stacks will shotgun SYNs before their peer
4020                  *     replies.
4021                  *  2) When PF catches an already established stream (the
4022                  *     firewall rebooted, the state table was flushed, routes
4023                  *     changed...)
4024                  *  3) Packets get funky immediately after the connection
4025                  *     closes (this should catch Solaris spurious ACK|FINs
4026                  *     that web servers like to spew after a close)
4027                  *
4028                  * This must be a little more careful than the above code
4029                  * since packet floods will also be caught here. We don't
4030                  * update the TTL here to mitigate the damage of a packet
4031                  * flood and so the same code can handle awkward establishment
4032                  * and a loosened connection close.
4033                  * In the establishment case, a correct peer response will
4034                  * validate the connection, go through the normal state code
4035                  * and keep updating the state TTL.
4036                  */
4037
4038                 if (pf_status.debug >= PF_DEBUG_MISC) {
4039                         kprintf("pf: loose state match: ");
4040                         pf_print_state(*state);
4041                         pf_print_flags(th->th_flags);
4042                         kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n",
4043                             seq, ack, pd->p_len, ackskew,
4044                             (*state)->packets[0], (*state)->packets[1]);
4045                 }
4046
4047                 /* update max window */
4048                 if (src->max_win < win)
4049                         src->max_win = win;
4050                 /* synchronize sequencing */
4051                 if (SEQ_GT(end, src->seqlo))
4052                         src->seqlo = end;
4053                 /* slide the window of what the other end can send */
4054                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4055                         dst->seqhi = ack + MAX((win << sws), 1);
4056
4057                 /*
4058                  * Cannot set dst->seqhi here since this could be a shotgunned
4059                  * SYN and not an already established connection.
4060                  */
4061
4062                 if (th->th_flags & TH_FIN)
4063                         if (src->state < TCPS_CLOSING)
4064                                 src->state = TCPS_CLOSING;
4065                 if (th->th_flags & TH_RST)
4066                         src->state = dst->state = TCPS_TIME_WAIT;
4067
4068                 /* Fall through to PASS packet */
4069
4070         } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY ||
4071                     ((*state)->pickup_mode == PF_PICKUPS_ENABLED &&
4072                      ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) !=
4073                       PFSTATE_GOT_SYN_MASK)) {
4074                 /*
4075                  * If pickup mode is hash only, do not fail on sequence checks.
4076                  *
4077                  * If pickup mode is enabled and we did not see the SYN in
4078                  * both direction, do not fail on sequence checks because
4079                  * we do not have complete information on window scale.
4080                  *
4081                  * Adjust expiration and fall through to PASS packet.
4082                  * XXX Add a FIN check to reduce timeout?
4083                  */
4084                 (*state)->expire = time_second;
4085         } else  {
4086                 /*
4087                  * Failure processing
4088                  */
4089                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4090                     (*state)->src.state == TCPS_SYN_SENT) {
4091                         /* Send RST for state mismatches during handshake */
4092                         if (!(th->th_flags & TH_RST)) {
4093                                 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
4094
4095                                 if (th->th_flags & TH_SYN)
4096                                         ack++;
4097                                 if (th->th_flags & TH_FIN)
4098                                         ack++;
4099                                 pf_send_tcp((*state)->rule.ptr, pd->af,
4100                                     pd->dst, pd->src, th->th_dport,
4101                                     th->th_sport, ntohl(th->th_ack), ack,
4102                                     TH_RST|TH_ACK, 0, 0,
4103                                     (*state)->rule.ptr->return_ttl);
4104                         }
4105                         src->seqlo = 0;
4106                         src->seqhi = 1;
4107                         src->max_win = 1;
4108                 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4109                         kprintf("pf: BAD state: ");
4110                         pf_print_state(*state);
4111                         pf_print_flags(th->th_flags);
4112                         kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d "
4113                             "dir=%s,%s\n", seq, ack, pd->p_len, ackskew,
4114                             (*state)->packets[0], (*state)->packets[1],
4115                             direction == PF_IN ? "in" : "out",
4116                             direction == (*state)->direction ? "fwd" : "rev");
4117                         kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4118                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4119                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4120                             ' ': '2',
4121                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4122                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4123                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4124                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4125                 }
4126                 return (PF_DROP);
4127         }
4128
4129         if (dst->scrub || src->scrub) {
4130                 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4131                     src, dst, &copyback))
4132                         return (PF_DROP);
4133         }
4134
4135         /* Any packets which have gotten here are to be passed */
4136
4137         /* translate source/destination address, if necessary */
4138         if (STATE_TRANSLATE(*state)) {
4139                 if (direction == PF_OUT)
4140                         pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4141                             &th->th_sum, &(*state)->gwy.addr,
4142                             (*state)->gwy.port, 0, pd->af);
4143                 else
4144                         pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4145                             &th->th_sum, &(*state)->lan.addr,
4146                             (*state)->lan.port, 0, pd->af);
4147                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4148         } else if (copyback) {
4149                 /* Copyback sequence modulation or stateful scrub changes */
4150                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4151         }
4152
4153         return (PF_PASS);
4154 }
4155
4156 int
4157 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4158     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4159 {
4160         struct pf_state_peer    *src, *dst;
4161         struct pf_state          key;
4162         struct udphdr           *uh = pd->hdr.udp;
4163
4164         key.af = pd->af;
4165         key.proto = IPPROTO_UDP;
4166         if (direction == PF_IN) {
4167                 PF_ACPY(&key.ext.addr, pd->src, key.af);
4168                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4169                 key.ext.port = uh->uh_sport;
4170                 key.gwy.port = uh->uh_dport;
4171         } else {
4172                 PF_ACPY(&key.lan.addr, pd->src, key.af);
4173                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4174                 key.lan.port = uh->uh_sport;
4175                 key.ext.port = uh->uh_dport;
4176         }
4177
4178         STATE_LOOKUP();
4179
4180         if (direction == (*state)->direction) {
4181                 src = &(*state)->src;
4182                 dst = &(*state)->dst;
4183         } else {
4184                 src = &(*state)->dst;
4185                 dst = &(*state)->src;
4186         }
4187
4188         /* update states */
4189         if (src->state < PFUDPS_SINGLE)
4190                 src->state = PFUDPS_SINGLE;
4191         if (dst->state == PFUDPS_SINGLE)
4192                 dst->state = PFUDPS_MULTIPLE;
4193
4194         /* update expire time */
4195         (*state)->expire = time_second;
4196         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4197                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4198         else
4199                 (*state)->timeout = PFTM_UDP_SINGLE;
4200
4201         /* translate source/destination address, if necessary */
4202         if (STATE_TRANSLATE(*state)) {
4203                 if (direction == PF_OUT)
4204                         pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4205                             &uh->uh_sum, &(*state)->gwy.addr,
4206                             (*state)->gwy.port, 1, pd->af);
4207                 else
4208                         pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4209                             &uh->uh_sum, &(*state)->lan.addr,
4210                             (*state)->lan.port, 1, pd->af);
4211                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4212         }
4213
4214         return (PF_PASS);
4215 }
4216
4217 int
4218 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4219     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4220 {
4221         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4222         u_int16_t        icmpid = 0;
4223         u_int16_t       *icmpsum = NULL;
4224         u_int8_t         icmptype = 0;
4225         int              state_icmp = 0;
4226
4227         switch (pd->proto) {
4228 #ifdef INET
4229         case IPPROTO_ICMP:
4230                 icmptype = pd->hdr.icmp->icmp_type;
4231                 icmpid = pd->hdr.icmp->icmp_id;
4232                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4233
4234                 if (icmptype == ICMP_UNREACH ||
4235                     icmptype == ICMP_SOURCEQUENCH ||
4236                     icmptype == ICMP_REDIRECT ||
4237                     icmptype == ICMP_TIMXCEED ||
4238                     icmptype == ICMP_PARAMPROB)
4239                         state_icmp++;
4240                 break;
4241 #endif /* INET */
4242 #ifdef INET6
4243         case IPPROTO_ICMPV6:
4244                 icmptype = pd->hdr.icmp6->icmp6_type;
4245                 icmpid = pd->hdr.icmp6->icmp6_id;
4246                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4247
4248                 if (icmptype == ICMP6_DST_UNREACH ||
4249                     icmptype == ICMP6_PACKET_TOO_BIG ||
4250                     icmptype == ICMP6_TIME_EXCEEDED ||
4251                     icmptype == ICMP6_PARAM_PROB)
4252                         state_icmp++;
4253                 break;
4254 #endif /* INET6 */
4255         }
4256
4257         if (!state_icmp) {
4258
4259                 /*
4260                  * ICMP query/reply message not related to a TCP/UDP packet.
4261                  * Search for an ICMP state.
4262                  */
4263                 struct pf_state         key;
4264
4265                 key.af = pd->af;
4266                 key.proto = pd->proto;
4267                 if (direction == PF_IN) {
4268                         PF_ACPY(&key.ext.addr, pd->src, key.af);
4269                         PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4270                         key.ext.port = icmpid;
4271                         key.gwy.port = icmpid;
4272                 } else {
4273                         PF_ACPY(&key.lan.addr, pd->src, key.af);
4274                         PF_ACPY(&key.ext.addr, pd->dst, key.af);
4275                         key.lan.port = icmpid;
4276                         key.ext.port = icmpid;
4277                 }
4278
4279                 STATE_LOOKUP();
4280
4281                 (*state)->expire = time_second;
4282                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4283
4284                 /* translate source/destination address, if necessary */
4285                 if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) {
4286                         if (direction == PF_OUT) {
4287                                 switch (pd->af) {
4288 #ifdef INET
4289                                 case AF_INET:
4290                                         pf_change_a(&saddr->v4.s_addr,
4291                                             pd->ip_sum,
4292                                             (*state)->gwy.addr.v4.s_addr, 0);
4293                                         break;
4294 #endif /* INET */
4295 #ifdef INET6
4296                                 case AF_INET6:
4297                                         pf_change_a6(saddr,
4298                                             &pd->hdr.icmp6->icmp6_cksum,
4299                                             &(*state)->gwy.addr, 0);
4300                                         m_copyback(m, off,
4301                                             sizeof(struct icmp6_hdr),
4302                                             (caddr_t)pd->hdr.icmp6);
4303                                         break;
4304 #endif /* INET6 */
4305                                 }
4306                         } else {
4307                                 switch (pd->af) {
4308 #ifdef INET
4309                                 case AF_INET:
4310                                         pf_change_a(&daddr->v4.s_addr,
4311                                             pd->ip_sum,
4312                                             (*state)->lan.addr.v4.s_addr, 0);
4313                                         break;
4314 #endif /* INET */
4315 #ifdef INET6
4316                                 case AF_INET6:
4317                                         pf_change_a6(daddr,
4318                                             &pd->hdr.icmp6->icmp6_cksum,
4319                                             &(*state)->lan.addr, 0);
4320                                         m_copyback(m, off,
4321                                             sizeof(struct icmp6_hdr),
4322                                             (caddr_t)pd->hdr.icmp6);
4323                                         break;
4324 #endif /* INET6 */
4325                                 }
4326                         }
4327                 }
4328
4329                 return (PF_PASS);
4330
4331         } else {
4332                 /*
4333                  * ICMP error message in response to a TCP/UDP packet.
4334                  * Extract the inner TCP/UDP header and search for that state.
4335                  */
4336
4337                 struct pf_pdesc pd2;
4338 #ifdef INET
4339                 struct ip       h2;
4340 #endif /* INET */
4341 #ifdef INET6
4342                 struct ip6_hdr  h2_6;
4343                 int             terminal = 0;
4344 #endif /* INET6 */
4345                 int             ipoff2 = 0;
4346                 int             off2 = 0;
4347
4348                 pd2.af = pd->af;
4349                 switch (pd->af) {
4350 #ifdef INET
4351                 case AF_INET:
4352                         /* offset of h2 in mbuf chain */
4353                         ipoff2 = off + ICMP_MINLEN;
4354
4355                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4356                             NULL, NULL, pd2.af)) {
4357                                 DPFPRINTF(PF_DEBUG_MISC,
4358                                     ("pf: ICMP error message too short "
4359                                     "(ip)\n"));
4360                                 return (PF_DROP);
4361                         }
4362                         /*
4363                          * ICMP error messages don't refer to non-first
4364                          * fragments
4365                          */
4366                         /*
4367                          * Note: We are dealing with an encapsulated
4368                          * header. This means ip_off/ip_len are not
4369                          * in host byte order!
4370                          */
4371                         if (h2.ip_off & htons(IP_OFFMASK))
4372                                 return (PF_DROP);
4373
4374                         /* offset of protocol header that follows h2 */
4375                         off2 = ipoff2 + (h2.ip_hl << 2);
4376
4377                         pd2.proto = h2.ip_p;
4378                         pd2.src = (struct pf_addr *)&h2.ip_src;
4379                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4380                         pd2.ip_sum = &h2.ip_sum;
4381                         break;
4382 #endif /* INET */
4383 #ifdef INET6
4384                 case AF_INET6:
4385                         ipoff2 = off + sizeof(struct icmp6_hdr);
4386
4387                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4388                             NULL, NULL, pd2.af)) {
4389                                 DPFPRINTF(PF_DEBUG_MISC,
4390                                     ("pf: ICMP error message too short "
4391                                     "(ip6)\n"));
4392                                 return (PF_DROP);
4393                         }
4394                         pd2.proto = h2_6.ip6_nxt;
4395                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4396                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4397                         pd2.ip_sum = NULL;
4398                         off2 = ipoff2 + sizeof(h2_6);
4399                         do {
4400                                 switch (pd2.proto) {
4401                                 case IPPROTO_FRAGMENT:
4402                                         /*
4403                                          * ICMPv6 error messages for
4404                                          * non-first fragments
4405                                          */
4406                                         return (PF_DROP);
4407                                 case IPPROTO_AH:
4408                                 case IPPROTO_HOPOPTS:
4409                                 case IPPROTO_ROUTING:
4410                                 case IPPROTO_DSTOPTS: {
4411                                         /* get next header and header length */
4412                                         struct ip6_ext opt6;
4413
4414                                         if (!pf_pull_hdr(m, off2, &opt6,
4415                                             sizeof(opt6), NULL, NULL, pd2.af)) {
4416                                                 DPFPRINTF(PF_DEBUG_MISC,
4417                                                     ("pf: ICMPv6 short opt\n"));
4418                                                 return (PF_DROP);
4419                                         }
4420                                         if (pd2.proto == IPPROTO_AH)
4421                                                 off2 += (opt6.ip6e_len + 2) * 4;
4422                                         else
4423                                                 off2 += (opt6.ip6e_len + 1) * 8;
4424                                         pd2.proto = opt6.ip6e_nxt;
4425                                         /* goto the next header */
4426                                         break;
4427                                 }
4428                                 default:
4429                                         terminal++;
4430                                         break;
4431                                 }
4432                         } while (!terminal);
4433                         break;
4434 #endif /* INET6 */
4435                 }
4436
4437                 switch (pd2.proto) {
4438                 case IPPROTO_TCP: {
4439                         struct tcphdr            th;
4440                         u_int32_t                seq;
4441                         struct pf_state          key;
4442                         struct pf_state_peer    *src, *dst;
4443                         u_int8_t                 dws;
4444                         int                      copyback = 0;
4445
4446                         /*
4447                          * Only the first 8 bytes of the TCP header can be
4448                          * expected. Don't access any TCP header fields after
4449                          * th_seq, an ackskew test is not possible.
4450                          */
4451                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, NULL, pd2.af)) {
4452                                 DPFPRINTF(PF_DEBUG_MISC,
4453                                     ("pf: ICMP error message too short "
4454                                     "(tcp)\n"));
4455                                 return (PF_DROP);
4456                         }
4457
4458                         key.af = pd2.af;
4459                         key.proto = IPPROTO_TCP;
4460                         if (direction == PF_IN) {
4461                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4462                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4463                                 key.ext.port = th.th_dport;
4464                                 key.gwy.port = th.th_sport;
4465                         } else {
4466                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4467                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4468                                 key.lan.port = th.th_dport;
4469                                 key.ext.port = th.th_sport;
4470                         }
4471
4472                         STATE_LOOKUP();
4473
4474                         if (direction == (*state)->direction) {
4475                                 src = &(*state)->dst;
4476                                 dst = &(*state)->src;
4477                         } else {
4478                                 src = &(*state)->src;
4479                                 dst = &(*state)->dst;
4480                         }
4481
4482                         if (src->wscale && dst->wscale &&
4483                             !(th.th_flags & TH_SYN))
4484                                 dws = dst->wscale & PF_WSCALE_MASK;
4485                         else
4486                                 dws = 0;
4487
4488                         /* Demodulate sequence number */
4489                         seq = ntohl(th.th_seq) - src->seqdiff;
4490                         if (src->seqdiff) {
4491                                 pf_change_a(&th.th_seq, icmpsum,
4492                                     htonl(seq), 0);
4493                                 copyback = 1;
4494                         }
4495
4496                         if (!SEQ_GEQ(src->seqhi, seq) ||
4497                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
4498                                 if (pf_status.debug >= PF_DEBUG_MISC) {
4499                                         kprintf("pf: BAD ICMP %d:%d ",
4500                                             icmptype, pd->hdr.icmp->icmp_code);
4501                                         pf_print_host(pd->src, 0, pd->af);
4502                                         kprintf(" -> ");
4503                                         pf_print_host(pd->dst, 0, pd->af);
4504                                         kprintf(" state: ");
4505                                         pf_print_state(*state);
4506                                         kprintf(" seq=%u\n", seq);
4507                                 }
4508                                 return (PF_DROP);
4509                         }
4510
4511                         if (STATE_TRANSLATE(*state)) {
4512                                 if (direction == PF_IN) {
4513                                         pf_change_icmp(pd2.src, &th.th_sport,
4514                                             daddr, &(*state)->lan.addr,
4515                                             (*state)->lan.port, NULL,
4516                                             pd2.ip_sum, icmpsum,
4517                                             pd->ip_sum, 0, pd2.af);
4518                                 } else {
4519                                         pf_change_icmp(pd2.dst, &th.th_dport,
4520                                             saddr, &(*state)->gwy.addr,
4521                                             (*state)->gwy.port, NULL,
4522                                             pd2.ip_sum, icmpsum,
4523                                             pd->ip_sum, 0, pd2.af);
4524                                 }
4525                                 copyback = 1;
4526                         }
4527
4528                         if (copyback) {
4529                                 switch (pd2.af) {
4530 #ifdef INET
4531                                 case AF_INET:
4532                                         m_copyback(m, off, ICMP_MINLEN,
4533                                             (caddr_t)pd->hdr.icmp);
4534                                         m_copyback(m, ipoff2, sizeof(h2),
4535                                             (caddr_t)&h2);
4536                                         break;
4537 #endif /* INET */
4538 #ifdef INET6
4539                                 case AF_INET6:
4540                                         m_copyback(m, off,
4541                                             sizeof(struct icmp6_hdr),
4542                                             (caddr_t)pd->hdr.icmp6);
4543                                         m_copyback(m, ipoff2, sizeof(h2_6),
4544                                             (caddr_t)&h2_6);
4545                                         break;
4546 #endif /* INET6 */
4547                                 }
4548                                 m_copyback(m, off2, 8, (caddr_t)&th);
4549                         }
4550
4551                         return (PF_PASS);
4552                         break;
4553                 }
4554                 case IPPROTO_UDP: {
4555                         struct udphdr           uh;
4556                         struct pf_state         key;
4557
4558                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4559                             NULL, NULL, pd2.af)) {
4560                                 DPFPRINTF(PF_DEBUG_MISC,
4561                                     ("pf: ICMP error message too short "
4562                                     "(udp)\n"));
4563                                 return (PF_DROP);
4564                         }
4565
4566                         key.af = pd2.af;
4567                         key.proto = IPPROTO_UDP;
4568                         if (direction == PF_IN) {
4569                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4570                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4571                                 key.ext.port = uh.uh_dport;
4572                                 key.gwy.port = uh.uh_sport;
4573                         } else {
4574                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4575                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4576                                 key.lan.port = uh.uh_dport;
4577                                 key.ext.port = uh.uh_sport;
4578                         }
4579
4580                         STATE_LOOKUP();
4581
4582                         if (STATE_TRANSLATE(*state)) {
4583                                 if (direction == PF_IN) {
4584                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4585                                             daddr, &(*state)->lan.addr,
4586                                             (*state)->lan.port, &uh.uh_sum,
4587                                             pd2.ip_sum, icmpsum,
4588                                             pd->ip_sum, 1, pd2.af);
4589                                 } else {
4590                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4591                                             saddr, &(*state)->gwy.addr,
4592                                             (*state)->gwy.port, &uh.uh_sum,
4593                                             pd2.ip_sum, icmpsum,
4594                                             pd->ip_sum, 1, pd2.af);
4595                                 }
4596                                 switch (pd2.af) {
4597 #ifdef INET
4598                                 case AF_INET:
4599                                         m_copyback(m, off, ICMP_MINLEN,
4600                                             (caddr_t)pd->hdr.icmp);
4601                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4602                                         break;
4603 #endif /* INET */
4604 #ifdef INET6
4605                                 case AF_INET6:
4606                                         m_copyback(m, off,
4607                                             sizeof(struct icmp6_hdr),
4608                                             (caddr_t)pd->hdr.icmp6);
4609                                         m_copyback(m, ipoff2, sizeof(h2_6),
4610                                             (caddr_t)&h2_6);
4611                                         break;
4612 #endif /* INET6 */
4613                                 }
4614                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4615                         }
4616
4617                         return (PF_PASS);
4618                         break;
4619                 }
4620 #ifdef INET
4621                 case IPPROTO_ICMP: {
4622                         struct icmp             iih;
4623                         struct pf_state         key;
4624
4625                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4626                             NULL, NULL, pd2.af)) {
4627                                 DPFPRINTF(PF_DEBUG_MISC,
4628                                     ("pf: ICMP error message too short i"
4629                                     "(icmp)\n"));
4630                                 return (PF_DROP);
4631                         }
4632
4633                         key.af = pd2.af;
4634                         key.proto = IPPROTO_ICMP;
4635                         if (direction == PF_IN) {
4636                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4637                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4638                                 key.ext.port = iih.icmp_id;
4639                                 key.gwy.port = iih.icmp_id;
4640                         } else {
4641                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4642                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4643                                 key.lan.port = iih.icmp_id;
4644                                 key.ext.port = iih.icmp_id;
4645                         }
4646
4647                         STATE_LOOKUP();
4648
4649                         if (STATE_TRANSLATE(*state)) {
4650                                 if (direction == PF_IN) {
4651                                         pf_change_icmp(pd2.src, &iih.icmp_id,
4652                                             daddr, &(*state)->lan.addr,
4653                                             (*state)->lan.port, NULL,
4654                                             pd2.ip_sum, icmpsum,
4655                                             pd->ip_sum, 0, AF_INET);
4656                                 } else {
4657                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
4658                                             saddr, &(*state)->gwy.addr,
4659                                             (*state)->gwy.port, NULL,
4660                                             pd2.ip_sum, icmpsum,
4661                                             pd->ip_sum, 0, AF_INET);
4662                                 }
4663                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
4664                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4665                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
4666                         }
4667
4668                         return (PF_PASS);
4669                         break;
4670                 }
4671 #endif /* INET */
4672 #ifdef INET6
4673                 case IPPROTO_ICMPV6: {
4674                         struct icmp6_hdr        iih;
4675                         struct pf_state         key;
4676
4677                         if (!pf_pull_hdr(m, off2, &iih,
4678                             sizeof(struct icmp6_hdr), NULL, NULL, pd2.af)) {
4679                                 DPFPRINTF(PF_DEBUG_MISC,
4680                                     ("pf: ICMP error message too short "
4681                                     "(icmp6)\n"));
4682                                 return (PF_DROP);
4683                         }
4684
4685                         key.af = pd2.af;
4686                         key.proto = IPPROTO_ICMPV6;
4687                         if (direction == PF_IN) {
4688                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4689                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4690                                 key.ext.port = iih.icmp6_id;
4691                                 key.gwy.port = iih.icmp6_id;
4692                         } else {
4693                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4694                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4695                                 key.lan.port = iih.icmp6_id;
4696                                 key.ext.port = iih.icmp6_id;
4697                         }
4698
4699                         STATE_LOOKUP();
4700
4701                         if (STATE_TRANSLATE(*state)) {
4702                                 if (direction == PF_IN) {
4703                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
4704                                             daddr, &(*state)->lan.addr,
4705                                             (*state)->lan.port, NULL,
4706                                             pd2.ip_sum, icmpsum,
4707                                             pd->ip_sum, 0, AF_INET6);
4708                                 } else {
4709                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
4710                                             saddr, &(*state)->gwy.addr,
4711                                             (*state)->gwy.port, NULL,
4712                                             pd2.ip_sum, icmpsum,
4713                                             pd->ip_sum, 0, AF_INET6);
4714                                 }
4715                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4716                                     (caddr_t)pd->hdr.icmp6);
4717                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
4718                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
4719                                     (caddr_t)&iih);
4720                         }
4721
4722                         return (PF_PASS);
4723                         break;
4724                 }
4725 #endif /* INET6 */
4726                 default: {
4727                         struct pf_state         key;
4728
4729                         key.af = pd2.af;
4730                         key.proto = pd2.proto;
4731                         if (direction == PF_IN) {
4732                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4733                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4734                                 key.ext.port = 0;
4735                                 key.gwy.port = 0;
4736                         } else {
4737                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4738                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4739                                 key.lan.port = 0;
4740                                 key.ext.port = 0;
4741                         }
4742
4743                         STATE_LOOKUP();
4744
4745                         if (STATE_TRANSLATE(*state)) {
4746                                 if (direction == PF_IN) {
4747                                         pf_change_icmp(pd2.src, NULL,
4748                                             daddr, &(*state)->lan.addr,
4749                                             0, NULL,
4750                                             pd2.ip_sum, icmpsum,
4751                                             pd->ip_sum, 0, pd2.af);
4752                                 } else {
4753                                         pf_change_icmp(pd2.dst, NULL,
4754                                             saddr, &(*state)->gwy.addr,
4755                                             0, NULL,
4756                                             pd2.ip_sum, icmpsum,
4757                                             pd->ip_sum, 0, pd2.af);
4758                                 }
4759                                 switch (pd2.af) {
4760 #ifdef INET
4761                                 case AF_INET:
4762                                         m_copyback(m, off, ICMP_MINLEN,
4763                                             (caddr_t)pd->hdr.icmp);
4764                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4765                                         break;
4766 #endif /* INET */
4767 #ifdef INET6
4768                                 case AF_INET6:
4769                                         m_copyback(m, off,
4770                                             sizeof(struct icmp6_hdr),
4771                                             (caddr_t)pd->hdr.icmp6);
4772                                         m_copyback(m, ipoff2, sizeof(h2_6),
4773                                             (caddr_t)&h2_6);
4774                                         break;
4775 #endif /* INET6 */
4776                                 }
4777                         }
4778
4779                         return (PF_PASS);
4780                         break;
4781                 }
4782                 }
4783         }
4784 }
4785
4786 int
4787 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
4788     struct pf_pdesc *pd)
4789 {
4790         struct pf_state_peer    *src, *dst;
4791         struct pf_state          key;
4792
4793         key.af = pd->af;
4794         key.proto = pd->proto;
4795         if (direction == PF_IN) {
4796                 PF_ACPY(&key.ext.addr, pd->src, key.af);
4797                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4798                 key.ext.port = 0;
4799                 key.gwy.port = 0;
4800         } else {
4801                 PF_ACPY(&key.lan.addr, pd->src, key.af);
4802                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4803                 key.lan.port = 0;
4804                 key.ext.port = 0;
4805         }
4806
4807         STATE_LOOKUP();
4808
4809         if (direction == (*state)->direction) {
4810                 src = &(*state)->src;
4811                 dst = &(*state)->dst;
4812         } else {
4813                 src = &(*state)->dst;
4814                 dst = &(*state)->src;
4815         }
4816
4817         /* update states */
4818         if (src->state < PFOTHERS_SINGLE)
4819                 src->state = PFOTHERS_SINGLE;
4820         if (dst->state == PFOTHERS_SINGLE)
4821                 dst->state = PFOTHERS_MULTIPLE;
4822
4823         /* update expire time */
4824         (*state)->expire = time_second;
4825         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
4826                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
4827         else
4828                 (*state)->timeout = PFTM_OTHER_SINGLE;
4829
4830         /* translate source/destination address, if necessary */
4831         if (STATE_TRANSLATE(*state)) {
4832                 if (direction == PF_OUT)
4833                         switch (pd->af) {
4834 #ifdef INET
4835                         case AF_INET:
4836                                 pf_change_a(&pd->src->v4.s_addr,
4837                                     pd->ip_sum, (*state)->gwy.addr.v4.s_addr,
4838                                     0);
4839                                 break;
4840 #endif /* INET */
4841 #ifdef INET6
4842                         case AF_INET6:
4843                                 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af);
4844                                 break;
4845 #endif /* INET6 */
4846                         }
4847                 else
4848                         switch (pd->af) {
4849 #ifdef INET
4850                         case AF_INET:
4851                                 pf_change_a(&pd->dst->v4.s_addr,
4852                                     pd->ip_sum, (*state)->lan.addr.v4.s_addr,
4853                                     0);
4854                                 break;
4855 #endif /* INET */
4856 #ifdef INET6
4857                         case AF_INET6:
4858                                 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af);
4859                                 break;
4860 #endif /* INET6 */
4861                         }
4862         }
4863
4864         return (PF_PASS);
4865 }
4866
4867 /*
4868  * ipoff and off are measured from the start of the mbuf chain.
4869  * h must be at "ipoff" on the mbuf chain.
4870  */
4871 void *
4872 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
4873     u_short *actionp, u_short *reasonp, sa_family_t af)
4874 {
4875         switch (af) {
4876 #ifdef INET
4877         case AF_INET: {
4878                 struct ip       *h = mtod(m, struct ip *);
4879                 u_int16_t        fragoff = (h->ip_off & IP_OFFMASK) << 3;
4880
4881                 if (fragoff) {
4882                         if (fragoff >= len)
4883                                 ACTION_SET(actionp, PF_PASS);
4884                         else {
4885                                 ACTION_SET(actionp, PF_DROP);
4886                                 REASON_SET(reasonp, PFRES_FRAG);
4887                         }
4888                         return (NULL);
4889                 }
4890                 if (m->m_pkthdr.len < off + len ||
4891                     h->ip_len < off + len) {
4892                         ACTION_SET(actionp, PF_DROP);
4893                         REASON_SET(reasonp, PFRES_SHORT);
4894                         return (NULL);
4895                 }
4896                 break;
4897         }
4898 #endif /* INET */
4899 #ifdef INET6
4900         case AF_INET6: {
4901                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
4902
4903                 if (m->m_pkthdr.len < off + len ||
4904                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
4905                     (unsigned)(off + len)) {
4906                         ACTION_SET(actionp, PF_DROP);
4907                         REASON_SET(reasonp, PFRES_SHORT);
4908                         return (NULL);
4909                 }
4910                 break;
4911         }
4912 #endif /* INET6 */
4913         }
4914         m_copydata(m, off, len, p);
4915         return (p);
4916 }
4917
4918 int
4919 pf_routable(struct pf_addr *addr, sa_family_t af)
4920 {
4921         struct sockaddr_in      *dst;
4922         struct route             ro;
4923         int                      ret = 0;
4924
4925         bzero(&ro, sizeof(ro));
4926         dst = satosin(&ro.ro_dst);
4927         dst->sin_family = af;
4928         dst->sin_len = sizeof(*dst);
4929         dst->sin_addr = addr->v4;
4930         rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
4931
4932         if (ro.ro_rt != NULL) {
4933                 ret = 1;
4934                 RTFREE(ro.ro_rt);
4935         }
4936
4937         return (ret);
4938 }
4939
4940 #ifdef INET
4941 void
4942 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
4943     struct pf_state *s)
4944 {
4945         struct mbuf             *m0, *m1;
4946         struct route             iproute;
4947         struct route            *ro = NULL;
4948         struct sockaddr_in      *dst;
4949         struct ip               *ip;
4950         struct ifnet            *ifp = NULL;
4951         struct pf_addr           naddr;
4952         struct pf_src_node      *sn = NULL;
4953         int                      error = 0;
4954         int sw_csum;
4955
4956         if (m == NULL || *m == NULL || r == NULL ||
4957             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
4958                 panic("pf_route: invalid parameters");
4959
4960         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
4961                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
4962                 (*m)->m_pkthdr.pf_routed = 1;
4963         } else {
4964                 if ((*m)->m_pkthdr.pf_routed > 3) {
4965                         m0 = *m;
4966                         *m = NULL;
4967                         goto bad;
4968                 }
4969                 (*m)->m_pkthdr.pf_routed++;
4970         }
4971
4972         if (r->rt == PF_DUPTO) {
4973                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
4974                         return;
4975         } else {
4976                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
4977                         return;
4978                 m0 = *m;
4979         }
4980
4981         if (m0->m_len < sizeof(struct ip))
4982                 panic("pf_route: m0->m_len < sizeof(struct ip)");
4983         ip = mtod(m0, struct ip *);
4984
4985         ro = &iproute;
4986         bzero((caddr_t)ro, sizeof(*ro));
4987         dst = satosin(&ro->ro_dst);
4988         dst->sin_family = AF_INET;
4989         dst->sin_len = sizeof(*dst);
4990         dst->sin_addr = ip->ip_dst;
4991
4992         if (r->rt == PF_FASTROUTE) {
4993                 rtalloc(ro);
4994                 if (ro->ro_rt == 0) {
4995                         ipstat.ips_noroute++;
4996                         goto bad;
4997                 }
4998
4999                 ifp = ro->ro_rt->rt_ifp;
5000                 ro->ro_rt->rt_use++;
5001
5002                 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
5003                         dst = satosin(ro->ro_rt->rt_gateway);
5004         } else {
5005                 if (TAILQ_EMPTY(&r->rpool.list))
5006                         panic("pf_route: TAILQ_EMPTY(&r->rpool.list)");
5007                 if (s == NULL) {
5008                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5009                             &naddr, NULL, &sn);
5010                         if (!PF_AZERO(&naddr, AF_INET))
5011                                 dst->sin_addr.s_addr = naddr.v4.s_addr;
5012                         ifp = r->rpool.cur->kif ?
5013                             r->rpool.cur->kif->pfik_ifp : NULL;
5014                 } else {
5015                         if (!PF_AZERO(&s->rt_addr, AF_INET))
5016                                 dst->sin_addr.s_addr =
5017                                     s->rt_addr.v4.s_addr;
5018                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5019                 }
5020         }
5021         if (ifp == NULL)
5022                 goto bad;
5023
5024         if (oifp != ifp) {
5025                 if (pf_test(PF_OUT, ifp, &m0) != PF_PASS)
5026                         goto bad;
5027                 else if (m0 == NULL)
5028                         goto done;
5029                 if (m0->m_len < sizeof(struct ip))
5030                         panic("pf_route: m0->m_len < sizeof(struct ip)");
5031                 ip = mtod(m0, struct ip *);
5032         }
5033
5034         /* Copied from ip_output. */
5035         m0->m_pkthdr.csum_flags |= CSUM_IP;
5036         sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
5037         if (sw_csum & CSUM_DELAY_DATA) {
5038                 in_delayed_cksum(m0);
5039                 sw_csum &= ~CSUM_DELAY_DATA;
5040         }
5041         m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
5042
5043         /*
5044          * If small enough for interface, or the interface will take
5045          * care of the fragmentation for us, can just send directly.
5046          */
5047         if (ip->ip_len <= ifp->if_mtu || ((ifp->if_hwassist & CSUM_FRAGMENT) &&
5048                 (ip->ip_off & IP_DF) == 0)) {
5049                 ip->ip_len = htons(ip->ip_len);
5050                 ip->ip_off = htons(ip->ip_off);
5051                 ip->ip_sum = 0;
5052                 if (sw_csum & CSUM_DELAY_IP) {
5053                         /* From KAME */
5054                         if (ip->ip_v == IPVERSION &&
5055                             (ip->ip_hl << 2) == sizeof(*ip)) {
5056                                 ip->ip_sum = in_cksum_hdr(ip);
5057                         } else {
5058                                 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5059                         }
5060                 }
5061
5062                 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt);
5063                 goto done;
5064         }
5065
5066         /*
5067          * Too large for interface; fragment if possible.
5068          * Must be able to put at least 8 bytes per fragment.
5069          */
5070         if (ip->ip_off & IP_DF) {
5071                 ipstat.ips_cantfrag++;
5072                 if (r->rt != PF_DUPTO) {
5073                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5074                             ifp->if_mtu);
5075                         goto done;
5076                 } else
5077                         goto bad;
5078         }
5079
5080         m1 = m0;
5081         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5082         if (error)
5083                 goto bad;
5084
5085         for (m0 = m1; m0; m0 = m1) {
5086                 m1 = m0->m_nextpkt;
5087                 m0->m_nextpkt = 0;
5088                 if (error == 0) {
5089                         error = ifp->if_output(ifp, m0, sintosa(dst), NULL);
5090                 } else {
5091                         m_freem(m0);
5092                 }
5093         }
5094
5095         if (error == 0)
5096                 ipstat.ips_fragmented++;
5097
5098 done:
5099         if (r->rt != PF_DUPTO)
5100                 *m = NULL;
5101         if (ro == &iproute && ro->ro_rt)
5102                 RTFREE(ro->ro_rt);
5103         return;
5104
5105 bad:
5106         m_freem(m0);
5107         goto done;
5108 }
5109 #endif /* INET */
5110
5111 #ifdef INET6
5112 void
5113 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5114     struct pf_state *s)
5115 {
5116         struct mbuf             *m0;
5117         struct route_in6         ip6route;
5118         struct route_in6        *ro;
5119         struct sockaddr_in6     *dst;
5120         struct ip6_hdr          *ip6;
5121         struct ifnet            *ifp = NULL;
5122         struct pf_addr           naddr;
5123         struct pf_src_node      *sn = NULL;
5124         int                      error = 0;
5125
5126         if (m == NULL || *m == NULL || r == NULL ||
5127             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5128                 panic("pf_route6: invalid parameters");
5129
5130         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5131                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5132                 (*m)->m_pkthdr.pf_routed = 1;
5133         } else {
5134                 if ((*m)->m_pkthdr.pf_routed > 3) {
5135                         m0 = *m;
5136                         *m = NULL;
5137                         goto bad;
5138                 }
5139                 (*m)->m_pkthdr.pf_routed++;
5140         }
5141
5142         if (r->rt == PF_DUPTO) {
5143                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5144                         return;
5145         } else {
5146                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5147                         return;
5148                 m0 = *m;
5149         }
5150
5151         if (m0->m_len < sizeof(struct ip6_hdr))
5152                 panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5153         ip6 = mtod(m0, struct ip6_hdr *);
5154
5155         ro = &ip6route;
5156         bzero((caddr_t)ro, sizeof(*ro));
5157         dst = (struct sockaddr_in6 *)&ro->ro_dst;
5158         dst->sin6_family = AF_INET6;
5159         dst->sin6_len = sizeof(*dst);
5160         dst->sin6_addr = ip6->ip6_dst;
5161
5162         /* Cheat. */
5163         if (r->rt == PF_FASTROUTE) {
5164                 m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED;
5165                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5166                 return;
5167         }
5168
5169         if (TAILQ_EMPTY(&r->rpool.list))
5170                 panic("pf_route6: TAILQ_EMPTY(&r->rpool.list)");
5171         if (s == NULL) {
5172                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5173                     &naddr, NULL, &sn);
5174                 if (!PF_AZERO(&naddr, AF_INET6))
5175                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5176                             &naddr, AF_INET6);
5177                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5178         } else {
5179                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5180                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5181                             &s->rt_addr, AF_INET6);
5182                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5183         }
5184         if (ifp == NULL)
5185                 goto bad;
5186
5187         if (oifp != ifp) {
5188                 if (pf_test6(PF_OUT, ifp, &m0) != PF_PASS)
5189                         goto bad;
5190                 else if (m0 == NULL)
5191                         goto done;
5192                 if (m0->m_len < sizeof(struct ip6_hdr))
5193                         panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5194                 ip6 = mtod(m0, struct ip6_hdr *);
5195         }
5196
5197         /*
5198          * If the packet is too large for the outgoing interface,
5199          * send back an icmp6 error.
5200          */
5201         if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5202                 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5203         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5204                 error = nd6_output(ifp, ifp, m0, dst, NULL);
5205         } else {
5206                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5207                 if (r->rt != PF_DUPTO)
5208                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5209                 else
5210                         goto bad;
5211         }
5212
5213 done:
5214         if (r->rt != PF_DUPTO)
5215                 *m = NULL;
5216         return;
5217
5218 bad:
5219         m_freem(m0);
5220         goto done;
5221 }
5222 #endif /* INET6 */
5223
5224
5225 /*
5226  * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5227  *   off is the offset where the protocol header starts
5228  *   len is the total length of protocol header plus payload
5229  * returns 0 when the checksum is valid, otherwise returns 1.
5230  */
5231 /*
5232  * XXX
5233  * FreeBSD supports cksum offload for the following drivers.
5234  * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5235  * If we can make full use of it we would outperform ipfw/ipfilter in
5236  * very heavy traffic.
5237  * I have not tested 'cause I don't have NICs that supports cksum offload.
5238  * (There might be problems. Typical phenomena would be
5239  *   1. No route message for UDP packet.
5240  *   2. No connection acceptance from external hosts regardless of rule set.)
5241  */
5242 int
5243 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5244     sa_family_t af)
5245 {
5246         u_int16_t sum = 0;
5247         int hw_assist = 0;
5248         struct ip *ip;
5249
5250         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5251                 return (1);
5252         if (m->m_pkthdr.len < off + len)
5253                 return (1);
5254
5255         switch (p) {
5256         case IPPROTO_TCP:
5257         case IPPROTO_UDP:
5258                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5259                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5260                                 sum = m->m_pkthdr.csum_data;
5261                         } else {
5262                                 ip = mtod(m, struct ip *);
5263                                 sum = in_pseudo(ip->ip_src.s_addr,
5264                                         ip->ip_dst.s_addr, htonl((u_short)len +
5265                                         m->m_pkthdr.csum_data + p));
5266                         }
5267                         sum ^= 0xffff;
5268                         ++hw_assist;
5269                 }
5270                 break;
5271         case IPPROTO_ICMP:
5272 #ifdef INET6
5273         case IPPROTO_ICMPV6:
5274 #endif /* INET6 */
5275                 break;
5276         default:
5277                 return (1);
5278         }
5279
5280         if (!hw_assist) {
5281                 switch (af) {
5282                 case AF_INET:
5283                         if (p == IPPROTO_ICMP) {
5284                                 if (m->m_len < off)
5285                                         return (1);
5286                                 m->m_data += off;
5287                                 m->m_len -= off;
5288                                 sum = in_cksum(m, len);
5289                                 m->m_data -= off;
5290                                 m->m_len += off;
5291                         } else {
5292                                 if (m->m_len < sizeof(struct ip))
5293                                         return (1);
5294                                 sum = in_cksum_range(m, p, off, len);
5295                                 if (sum == 0) {
5296                                         m->m_pkthdr.csum_flags |=
5297                                             (CSUM_DATA_VALID |
5298                                              CSUM_PSEUDO_HDR);
5299                                         m->m_pkthdr.csum_data = 0xffff;
5300                                 }
5301                         }
5302                         break;
5303 #ifdef INET6
5304                 case AF_INET6:
5305                         if (m->m_len < sizeof(struct ip6_hdr))
5306                                 return (1);
5307                         sum = in6_cksum(m, p, off, len);
5308                         /*
5309                          * XXX
5310                          * IPv6 H/W cksum off-load not supported yet!
5311                          *
5312                          * if (sum == 0) {
5313                          *      m->m_pkthdr.csum_flags |=
5314                          *          (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5315                          *      m->m_pkthdr.csum_data = 0xffff;
5316                          *}
5317                          */
5318                         break;
5319 #endif /* INET6 */
5320                 default:
5321                         return (1);
5322                 }
5323         }
5324         if (sum) {
5325                 switch (p) {
5326                 case IPPROTO_TCP:
5327                         tcpstat.tcps_rcvbadsum++;
5328                         break;
5329                 case IPPROTO_UDP:
5330                         udpstat.udps_badsum++;
5331                         break;
5332                 case IPPROTO_ICMP:
5333                         icmpstat.icps_checksum++;
5334                         break;
5335 #ifdef INET6
5336                 case IPPROTO_ICMPV6:
5337                         icmp6stat.icp6s_checksum++;
5338                         break;
5339 #endif /* INET6 */
5340                 }
5341                 return (1);
5342         }
5343         return (0);
5344 }
5345
5346 #ifdef INET
5347 int
5348 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0)
5349 {
5350         struct pfi_kif          *kif;
5351         u_short                  action, reason = 0, log = 0;
5352         struct mbuf             *m = *m0;
5353         struct ip               *h = NULL;
5354         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5355         struct pf_state         *s = NULL;
5356         struct pf_ruleset       *ruleset = NULL;
5357         struct pf_pdesc          pd;
5358         int                      off, dirndx, pqid = 0;
5359
5360         if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED))
5361                 return (PF_PASS);
5362
5363         kif = pfi_index2kif[ifp->if_index];
5364         if (kif == NULL)
5365                 return (PF_DROP);
5366
5367 #ifdef DIAGNOSTIC
5368         if ((m->m_flags & M_PKTHDR) == 0)
5369                 panic("non-M_PKTHDR is passed to pf_test");
5370 #endif
5371
5372         memset(&pd, 0, sizeof(pd));
5373         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5374                 action = PF_DROP;
5375                 REASON_SET(&reason, PFRES_SHORT);
5376                 log = 1;
5377                 goto done;
5378         }
5379
5380         /* We do IP header normalization and packet reassembly here */
5381         if (pf_normalize_ip(m0, dir, kif, &reason) != PF_PASS) {
5382                 action = PF_DROP;
5383                 goto done;
5384         }
5385         m = *m0;
5386         h = mtod(m, struct ip *);
5387
5388         off = h->ip_hl << 2;
5389         if (off < (int)sizeof(*h)) {
5390                 action = PF_DROP;
5391                 REASON_SET(&reason, PFRES_SHORT);
5392                 log = 1;
5393                 goto done;
5394         }
5395
5396         pd.src = (struct pf_addr *)&h->ip_src;
5397         pd.dst = (struct pf_addr *)&h->ip_dst;
5398         PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
5399         pd.ip_sum = &h->ip_sum;
5400         pd.proto = h->ip_p;
5401         pd.af = AF_INET;
5402         pd.tos = h->ip_tos;
5403         pd.tot_len = h->ip_len;
5404
5405         /* handle fragments that didn't get reassembled by normalization */
5406         if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5407                 action = pf_test_fragment(&r, dir, kif, m, h,
5408                     &pd, &a, &ruleset);
5409                 goto done;
5410         }
5411
5412         switch (h->ip_p) {
5413
5414         case IPPROTO_TCP: {
5415                 struct tcphdr   th;
5416
5417                 pd.hdr.tcp = &th;
5418                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5419                     &action, &reason, AF_INET)) {
5420                         log = action != PF_PASS;
5421                         goto done;
5422                 }
5423                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5424                     h->ip_len - off, IPPROTO_TCP, AF_INET)) {
5425                         action = PF_DROP;
5426                         goto done;
5427                 }
5428                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5429                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5430                         pqid = 1;
5431                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5432                 if (action == PF_DROP)
5433                         goto done;
5434                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5435                     &reason);
5436                 if (action == PF_PASS) {
5437 #if NPFSYNC
5438                         pfsync_update_state(s);
5439 #endif
5440                         r = s->rule.ptr;
5441                         a = s->anchor.ptr;
5442                         log = s->log;
5443                 } else if (s == NULL)
5444                         action = pf_test_tcp(&r, &s, dir, kif,
5445                             m, off, h, &pd, &a, &ruleset);
5446                 break;
5447         }
5448
5449         case IPPROTO_UDP: {
5450                 struct udphdr   uh;
5451
5452                 pd.hdr.udp = &uh;
5453                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5454                     &action, &reason, AF_INET)) {
5455                         log = action != PF_PASS;
5456                         goto done;
5457                 }
5458                 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5459                     off, h->ip_len - off, IPPROTO_UDP, AF_INET)) {
5460                         action = PF_DROP;
5461                         goto done;
5462                 }
5463                 if (uh.uh_dport == 0 ||
5464                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5465                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5466                         action = PF_DROP;
5467                         goto done;
5468                 }
5469                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5470                 if (action == PF_PASS) {
5471 #if NPFSYNC
5472                         pfsync_update_state(s);
5473 #endif
5474                         r = s->rule.ptr;
5475                         a = s->anchor.ptr;
5476                         log = s->log;
5477                 } else if (s == NULL)
5478                         action = pf_test_udp(&r, &s, dir, kif,
5479                             m, off, h, &pd, &a, &ruleset);
5480                 break;
5481         }
5482
5483         case IPPROTO_ICMP: {
5484                 struct icmp     ih;
5485
5486                 pd.hdr.icmp = &ih;
5487                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5488                     &action, &reason, AF_INET)) {
5489                         log = action != PF_PASS;
5490                         goto done;
5491                 }
5492                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5493                     h->ip_len - off, IPPROTO_ICMP, AF_INET)) {
5494                         action = PF_DROP;
5495                         goto done;
5496                 }
5497                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd);
5498                 if (action == PF_PASS) {
5499 #if NPFSYNC
5500                         pfsync_update_state(s);
5501 #endif
5502                         r = s->rule.ptr;
5503                         a = s->anchor.ptr;
5504                         log = s->log;
5505                 } else if (s == NULL)
5506                         action = pf_test_icmp(&r, &s, dir, kif,
5507                             m, off, h, &pd, &a, &ruleset);
5508                 break;
5509         }
5510
5511         default:
5512                 action = pf_test_state_other(&s, dir, kif, &pd);
5513                 if (action == PF_PASS) {
5514 #if NPFSYNC
5515                         pfsync_update_state(s);
5516 #endif
5517                         r = s->rule.ptr;
5518                         a = s->anchor.ptr;
5519                         log = s->log;
5520                 } else if (s == NULL)
5521                         action = pf_test_other(&r, &s, dir, kif, m, off, h,
5522                             &pd, &a, &ruleset);
5523                 break;
5524         }
5525
5526 done:
5527         if (action == PF_PASS && h->ip_hl > 5 &&
5528             !((s && s->allow_opts) || r->allow_opts)) {
5529                 action = PF_DROP;
5530                 REASON_SET(&reason, PFRES_SHORT);
5531                 log = 1;
5532                 DPFPRINTF(PF_DEBUG_MISC,
5533                     ("pf: dropping packet with ip options\n"));
5534         }
5535
5536 #ifdef ALTQ
5537         if (action == PF_PASS && r->qid) {
5538                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
5539                 if (pd.tos == IPTOS_LOWDELAY)
5540                         m->m_pkthdr.altq_qid = r->pqid;
5541                 else
5542                         m->m_pkthdr.altq_qid = r->qid;
5543                 if (s) {
5544                         KKASSERT(s->hash != 0);
5545                         m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED;
5546                         m->m_pkthdr.altq_state_hash = s->hash;
5547                 }
5548                 m->m_pkthdr.ecn_af = AF_INET;
5549                 m->m_pkthdr.header = h;
5550         }
5551 #endif
5552
5553         /*
5554          * connections redirected to loopback should not match sockets
5555          * bound specifically to loopback due to security implications,
5556          * see tcp_input() and in_pcblookup_listen().
5557          */
5558         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5559             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5560             (s->nat_rule.ptr->action == PF_RDR ||
5561             s->nat_rule.ptr->action == PF_BINAT) &&
5562             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
5563                 action = PF_DROP;
5564                 REASON_SET(&reason, PFRES_MEMORY);
5565         }
5566
5567         m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5568
5569         if (log)
5570                 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset);
5571
5572         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5573         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
5574
5575         if (action == PF_PASS || r->action == PF_DROP) {
5576                 r->packets++;
5577                 r->bytes += pd.tot_len;
5578                 if (a != NULL) {
5579                         a->packets++;
5580                         a->bytes += pd.tot_len;
5581                 }
5582                 if (s != NULL) {
5583                         dirndx = (dir == s->direction) ? 0 : 1;
5584                         s->packets[dirndx]++;
5585                         s->bytes[dirndx] += pd.tot_len;
5586                         if (s->nat_rule.ptr != NULL) {
5587                                 s->nat_rule.ptr->packets++;
5588                                 s->nat_rule.ptr->bytes += pd.tot_len;
5589                         }
5590                         if (s->src_node != NULL) {
5591                                 s->src_node->packets++;
5592                                 s->src_node->bytes += pd.tot_len;
5593                         }
5594                         if (s->nat_src_node != NULL) {
5595                                 s->nat_src_node->packets++;
5596                                 s->nat_src_node->bytes += pd.tot_len;
5597                         }
5598                 }
5599                 tr = r;
5600                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5601                 if (nr != NULL) {
5602                         struct pf_addr *x;
5603                         /*
5604                          * XXX: we need to make sure that the addresses
5605                          * passed to pfr_update_stats() are the same than
5606                          * the addresses used during matching (pfr_match)
5607                          */
5608                         if (r == &pf_default_rule) {
5609                                 tr = nr;
5610                                 x = (s == NULL || s->direction == dir) ?
5611                                     &pd.baddr : &pd.naddr;
5612                         } else
5613                                 x = (s == NULL || s->direction == dir) ?
5614                                     &pd.naddr : &pd.baddr;
5615                         if (x == &pd.baddr || s == NULL) {
5616                                 /* we need to change the address */
5617                                 if (dir == PF_OUT)
5618                                         pd.src = x;
5619                                 else
5620                                         pd.dst = x;
5621                         }
5622                 }
5623                 if (tr->src.addr.type == PF_ADDR_TABLE)
5624                         pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5625                             s->direction == dir) ? pd.src : pd.dst, pd.af,
5626                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5627                             tr->src.not);
5628                 if (tr->dst.addr.type == PF_ADDR_TABLE)
5629                         pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5630                             s->direction == dir) ? pd.dst : pd.src, pd.af,
5631                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5632                             tr->dst.not);
5633         }
5634
5635
5636         if (action == PF_SYNPROXY_DROP) {
5637                 m_freem(*m0);
5638                 *m0 = NULL;
5639                 action = PF_PASS;
5640         } else if (r->rt)
5641                 /* pf_route can free the mbuf causing *m0 to become NULL */
5642                 pf_route(m0, r, dir, ifp, s);
5643
5644         return (action);
5645 }
5646 #endif /* INET */
5647
5648 #ifdef INET6
5649 int
5650 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0)
5651 {
5652         struct pfi_kif          *kif;
5653         u_short                  action, reason = 0, log = 0;
5654         struct mbuf             *m = *m0;
5655         struct ip6_hdr          *h = NULL;
5656         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5657         struct pf_state         *s = NULL;
5658         struct pf_ruleset       *ruleset = NULL;
5659         struct pf_pdesc          pd;
5660         int                      off, terminal = 0, dirndx;
5661
5662         if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED))
5663                 return (PF_PASS);
5664
5665         kif = pfi_index2kif[ifp->if_index];
5666         if (kif == NULL)
5667                 return (PF_DROP);
5668
5669 #ifdef DIAGNOSTIC
5670         if ((m->m_flags & M_PKTHDR) == 0)
5671                 panic("non-M_PKTHDR is passed to pf_test");
5672 #endif
5673
5674         memset(&pd, 0, sizeof(pd));
5675         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5676                 action = PF_DROP;
5677                 REASON_SET(&reason, PFRES_SHORT);
5678                 log = 1;
5679                 goto done;
5680         }
5681
5682         /* We do IP header normalization and packet reassembly here */
5683         if (pf_normalize_ip6(m0, dir, kif, &reason) != PF_PASS) {
5684                 action = PF_DROP;
5685                 goto done;
5686         }
5687         m = *m0;
5688         h = mtod(m, struct ip6_hdr *);
5689
5690         pd.src = (struct pf_addr *)&h->ip6_src;
5691         pd.dst = (struct pf_addr *)&h->ip6_dst;
5692         PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
5693         pd.ip_sum = NULL;
5694         pd.af = AF_INET6;
5695         pd.tos = 0;
5696         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
5697
5698         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
5699         pd.proto = h->ip6_nxt;
5700         do {
5701                 switch (pd.proto) {
5702                 case IPPROTO_FRAGMENT:
5703                         action = pf_test_fragment(&r, dir, kif, m, h,
5704                             &pd, &a, &ruleset);
5705                         if (action == PF_DROP)
5706                                 REASON_SET(&reason, PFRES_FRAG);
5707                         goto done;
5708                 case IPPROTO_AH:
5709                 case IPPROTO_HOPOPTS:
5710                 case IPPROTO_ROUTING:
5711                 case IPPROTO_DSTOPTS: {
5712                         /* get next header and header length */
5713                         struct ip6_ext  opt6;
5714
5715                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
5716                             NULL, NULL, pd.af)) {
5717                                 DPFPRINTF(PF_DEBUG_MISC,
5718                                     ("pf: IPv6 short opt\n"));
5719                                 action = PF_DROP;
5720                                 REASON_SET(&reason, PFRES_SHORT);
5721                                 log = 1;
5722                                 goto done;
5723                         }
5724                         if (pd.proto == IPPROTO_AH)
5725                                 off += (opt6.ip6e_len + 2) * 4;
5726                         else
5727                                 off += (opt6.ip6e_len + 1) * 8;
5728                         pd.proto = opt6.ip6e_nxt;
5729                         /* goto the next header */
5730                         break;
5731                 }
5732                 default:
5733                         terminal++;
5734                         break;
5735                 }
5736         } while (!terminal);
5737
5738         switch (pd.proto) {
5739
5740         case IPPROTO_TCP: {
5741                 struct tcphdr   th;
5742
5743                 pd.hdr.tcp = &th;
5744                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5745                     &action, &reason, AF_INET6)) {
5746                         log = action != PF_PASS;
5747                         goto done;
5748                 }
5749                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5750                     ntohs(h->ip6_plen), IPPROTO_TCP, AF_INET6)) {
5751                         action = PF_DROP;
5752                         goto done;
5753                 }
5754                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5755                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5756                 if (action == PF_DROP)
5757                         goto done;
5758                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5759                     &reason);
5760                 if (action == PF_PASS) {
5761 #if NPFSYNC
5762                         pfsync_update_state(s);
5763 #endif
5764                         r = s->rule.ptr;
5765                         a = s->anchor.ptr;
5766                         log = s->log;
5767                 } else if (s == NULL)
5768                         action = pf_test_tcp(&r, &s, dir, kif,
5769                             m, off, h, &pd, &a, &ruleset);
5770                 break;
5771         }
5772
5773         case IPPROTO_UDP: {
5774                 struct udphdr   uh;
5775
5776                 pd.hdr.udp = &uh;
5777                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5778                     &action, &reason, AF_INET6)) {
5779                         log = action != PF_PASS;
5780                         goto done;
5781                 }
5782                 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5783                     off, ntohs(h->ip6_plen), IPPROTO_UDP, AF_INET6)) {
5784                         action = PF_DROP;
5785                         goto done;
5786                 }
5787                 if (uh.uh_dport == 0 ||
5788                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5789                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5790                         action = PF_DROP;
5791                         goto done;
5792                 }
5793                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5794                 if (action == PF_PASS) {
5795 #if NPFSYNC
5796                         pfsync_update_state(s);
5797 #endif
5798                         r = s->rule.ptr;
5799                         a = s->anchor.ptr;
5800                         log = s->log;
5801                 } else if (s == NULL)
5802                         action = pf_test_udp(&r, &s, dir, kif,
5803                             m, off, h, &pd, &a, &ruleset);
5804                 break;
5805         }
5806
5807         case IPPROTO_ICMPV6: {
5808                 struct icmp6_hdr        ih;
5809
5810                 pd.hdr.icmp6 = &ih;
5811                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
5812                     &action, &reason, AF_INET6)) {
5813                         log = action != PF_PASS;
5814                         goto done;
5815                 }
5816                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5817                     ntohs(h->ip6_plen), IPPROTO_ICMPV6, AF_INET6)) {
5818                         action = PF_DROP;
5819                         goto done;
5820                 }
5821                 action = pf_test_state_icmp(&s, dir, kif,
5822                     m, off, h, &pd);
5823                 if (action == PF_PASS) {
5824 #if NPFSYNC
5825                         pfsync_update_state(s);
5826 #endif
5827                         r = s->rule.ptr;
5828                         a = s->anchor.ptr;
5829                         log = s->log;
5830                 } else if (s == NULL)
5831                         action = pf_test_icmp(&r, &s, dir, kif,
5832                             m, off, h, &pd, &a, &ruleset);
5833                 break;
5834         }
5835
5836         default:
5837                 action = pf_test_state_other(&s, dir, kif, &pd);
5838                 if (action == PF_PASS) {
5839                         r = s->rule.ptr;
5840                         a = s->anchor.ptr;
5841                         log = s->log;
5842                 } else if (s == NULL)
5843                         action = pf_test_other(&r, &s, dir, kif, m, off, h,
5844                             &pd, &a, &ruleset);
5845                 break;
5846         }
5847
5848 done:
5849         /* XXX handle IPv6 options, if not allowed. not implemented. */
5850
5851 #ifdef ALTQ
5852         if (action == PF_PASS && r->qid) {
5853                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
5854                 if (pd.tos == IPTOS_LOWDELAY)
5855                         m->m_pkthdr.altq_qid = r->pqid;
5856                 else
5857                         m->m_pkthdr.altq_qid = r->qid;
5858                 if (s) {
5859                         KKASSERT(s->hash != 0);
5860                         m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED;
5861                         m->m_pkthdr.altq_state_hash = s->hash;
5862                 }
5863                 m->m_pkthdr.ecn_af = AF_INET6;
5864                 m->m_pkthdr.header = h;
5865         }
5866 #endif
5867
5868         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5869             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5870             (s->nat_rule.ptr->action == PF_RDR ||
5871             s->nat_rule.ptr->action == PF_BINAT) &&
5872             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) {
5873                 action = PF_DROP;
5874                 REASON_SET(&reason, PFRES_MEMORY);
5875         }
5876
5877         m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5878
5879         if (log)
5880                 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset);
5881
5882         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5883         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
5884
5885         if (action == PF_PASS || r->action == PF_DROP) {
5886                 r->packets++;
5887                 r->bytes += pd.tot_len;
5888                 if (a != NULL) {
5889                         a->packets++;
5890                         a->bytes += pd.tot_len;
5891                 }
5892                 if (s != NULL) {
5893                         dirndx = (dir == s->direction) ? 0 : 1;
5894                         s->packets[dirndx]++;
5895                         s->bytes[dirndx] += pd.tot_len;
5896                         if (s->nat_rule.ptr != NULL) {
5897                                 s->nat_rule.ptr->packets++;
5898                                 s->nat_rule.ptr->bytes += pd.tot_len;
5899                         }
5900                         if (s->src_node != NULL) {
5901                                 s->src_node->packets++;
5902                                 s->src_node->bytes += pd.tot_len;
5903                         }
5904                         if (s->nat_src_node != NULL) {
5905                                 s->nat_src_node->packets++;
5906                                 s->nat_src_node->bytes += pd.tot_len;
5907                         }
5908                 }
5909                 tr = r;
5910                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5911                 if (nr != NULL) {
5912                         struct pf_addr *x;
5913                         /*
5914                          * XXX: we need to make sure that the addresses
5915                          * passed to pfr_update_stats() are the same than
5916                          * the addresses used during matching (pfr_match)
5917                          */
5918                         if (r == &pf_default_rule) {
5919                                 tr = nr;
5920                                 x = (s == NULL || s->direction == dir) ?
5921                                     &pd.baddr : &pd.naddr;
5922                         } else {
5923                                 x = (s == NULL || s->direction == dir) ?
5924                                     &pd.naddr : &pd.baddr;
5925                         }
5926                         if (x == &pd.baddr || s == NULL) {
5927                                 if (dir == PF_OUT)
5928                                         pd.src = x;
5929                                 else
5930                                         pd.dst = x;
5931                         }
5932                 }
5933                 if (tr->src.addr.type == PF_ADDR_TABLE)
5934                         pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5935                             s->direction == dir) ? pd.src : pd.dst, pd.af,
5936                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5937                             tr->src.not);
5938                 if (tr->dst.addr.type == PF_ADDR_TABLE)
5939                         pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5940                             s->direction == dir) ? pd.dst : pd.src, pd.af,
5941                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5942                             tr->dst.not);
5943         }
5944
5945
5946         if (action == PF_SYNPROXY_DROP) {
5947                 m_freem(*m0);
5948                 *m0 = NULL;
5949                 action = PF_PASS;
5950         } else if (r->rt)
5951                 /* pf_route6 can free the mbuf causing *m0 to become NULL */
5952                 pf_route6(m0, r, dir, ifp, s);
5953
5954         return (action);
5955 }
5956 #endif /* INET6 */