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 1.2 2004/11/30 16:02:21 joerg 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/route.h>
  66
  67 #include <netinet/in.h>
  68 #include <netinet/in_var.h>
  69 #include <netinet/in_systm.h>
  70 #include <netinet/ip.h>
  71 #include <netinet/ip_var.h>
  72 #include <netinet/tcp.h>
  73 #include <netinet/tcp_seq.h>
  74 #include <netinet/udp.h>
  75 #include <netinet/ip_icmp.h>
  76 #include <netinet/in_pcb.h>
  77 #include <netinet/tcp_timer.h>
  78 #include <netinet/tcp_var.h>
  79 #include <netinet/udp_var.h>
  80 #include <netinet/icmp_var.h>
  81
  82 #include <net/pf/pfvar.h>
  83 #include <net/pf/if_pflog.h>
  84
  85 #if NPFSYNC > 0
  86 #include <net/pf/if_pfsync.h>
  87 #endif /* NPFSYNC > 0 */
  88
  89 #ifdef INET6
  90 #include <netinet/ip6.h>
  91 #include <netinet/in_pcb.h>
  92 #include <netinet/icmp6.h>
  93 #include <netinet6/nd6.h>
  94 #include <netinet6/ip6_var.h>
  95 #include <netinet6/in6_pcb.h>
  96 #endif /* INET6 */
  97
  98 #include <sys/in_cksum.h>
  99 #include <machine/limits.h>
 100 #include <sys/msgport2.h>
 101 #include <sys/ucred.h>
 102
 103 extern int ip_optcopy(struct ip *, struct ip *);
 104
 105 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x
 106
 107 /*
 108  * Global variables
 109  */
 110
 111 struct pf_anchorqueue    pf_anchors;
 112 struct pf_ruleset        pf_main_ruleset;
 113 struct pf_altqqueue      pf_altqs[2];
 114 struct pf_palist         pf_pabuf;
 115 struct pf_altqqueue     *pf_altqs_active;
 116 struct pf_altqqueue     *pf_altqs_inactive;
 117 struct pf_status         pf_status;
 118
 119 u_int32_t                ticket_altqs_active;
 120 u_int32_t                ticket_altqs_inactive;
 121 int                      altqs_inactive_open;
 122 u_int32_t                ticket_pabuf;
 123
 124 struct callout           pf_expire_to;                  /* expire timeout */
 125
 126 vm_zone_t                pf_src_tree_pl, pf_rule_pl;
 127 vm_zone_t                pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
 128
 129 void                     pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
 130 void                     pf_print_state(struct pf_state *);
 131 void                     pf_print_flags(u_int8_t);
 132
 133 u_int16_t                pf_cksum_fixup(u_int16_t, u_int16_t, u_int16_t,
 134                             u_int8_t);
 135 void                     pf_change_ap(struct pf_addr *, u_int16_t *,
 136                             u_int16_t *, u_int16_t *, struct pf_addr *,
 137                             u_int16_t, u_int8_t, sa_family_t);
 138 #ifdef INET6
 139 void                     pf_change_a6(struct pf_addr *, u_int16_t *,
 140                             struct pf_addr *, u_int8_t);
 141 #endif /* INET6 */
 142 void                     pf_change_icmp(struct pf_addr *, u_int16_t *,
 143                             struct pf_addr *, struct pf_addr *, u_int16_t,
 144                             u_int16_t *, u_int16_t *, u_int16_t *,
 145                             u_int16_t *, u_int8_t, sa_family_t);
 146 void                     pf_send_tcp(const struct pf_rule *, sa_family_t,
 147                             const struct pf_addr *, const struct pf_addr *,
 148                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 149                             u_int8_t, u_int16_t, u_int16_t, u_int8_t);
 150 void                     pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 151                             sa_family_t, struct pf_rule *);
 152 struct pf_rule          *pf_match_translation(struct pf_pdesc *, struct mbuf *,
 153                             int, int, struct pfi_kif *,
 154                             struct pf_addr *, u_int16_t, struct pf_addr *,
 155                             u_int16_t, int);
 156 struct pf_rule          *pf_get_translation(struct pf_pdesc *, struct mbuf *,
 157                             int, int, struct pfi_kif *, struct pf_src_node **,
 158                             struct pf_addr *, u_int16_t,
 159                             struct pf_addr *, u_int16_t,
 160                             struct pf_addr *, u_int16_t *);
 161 int                      pf_test_tcp(struct pf_rule **, struct pf_state **,
 162                             int, struct pfi_kif *, struct mbuf *, int,
 163                             void *, struct pf_pdesc *, struct pf_rule **,
 164                             struct pf_ruleset **);
 165 int                      pf_test_udp(struct pf_rule **, struct pf_state **,
 166                             int, struct pfi_kif *, struct mbuf *, int,
 167                             void *, struct pf_pdesc *, struct pf_rule **,
 168                             struct pf_ruleset **);
 169 int                      pf_test_icmp(struct pf_rule **, struct pf_state **,
 170                             int, struct pfi_kif *, struct mbuf *, int,
 171                             void *, struct pf_pdesc *, struct pf_rule **,
 172                             struct pf_ruleset **);
 173 int                      pf_test_other(struct pf_rule **, struct pf_state **,
 174                             int, struct pfi_kif *, struct mbuf *, int, void *,
 175                             struct pf_pdesc *, struct pf_rule **,
 176                             struct pf_ruleset **);
 177 int                      pf_test_fragment(struct pf_rule **, int,
 178                             struct pfi_kif *, struct mbuf *, void *,
 179                             struct pf_pdesc *, struct pf_rule **,
 180                             struct pf_ruleset **);
 181 int                      pf_test_state_tcp(struct pf_state **, int,
 182                             struct pfi_kif *, struct mbuf *, int,
 183                             void *, struct pf_pdesc *, u_short *);
 184 int                      pf_test_state_udp(struct pf_state **, int,
 185                             struct pfi_kif *, struct mbuf *, int,
 186                             void *, struct pf_pdesc *);
 187 int                      pf_test_state_icmp(struct pf_state **, int,
 188                             struct pfi_kif *, struct mbuf *, int,
 189                             void *, struct pf_pdesc *);
 190 int                      pf_test_state_other(struct pf_state **, int,
 191                             struct pfi_kif *, struct pf_pdesc *);
 192 static int               pf_match_tag(struct mbuf *, struct pf_rule *,
 193                                       struct pf_rule *, int *);
 194 void                     pf_hash(struct pf_addr *, struct pf_addr *,
 195                             struct pf_poolhashkey *, sa_family_t);
 196 int                      pf_map_addr(u_int8_t, struct pf_rule *,
 197                             struct pf_addr *, struct pf_addr *,
 198                             struct pf_addr *, struct pf_src_node **);
 199 int                      pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
 200                             struct pf_addr *, struct pf_addr *, u_int16_t,
 201                             struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
 202                             struct pf_src_node **);
 203 void                     pf_route(struct mbuf **, struct pf_rule *, int,
 204                             struct ifnet *, struct pf_state *);
 205 void                     pf_route6(struct mbuf **, struct pf_rule *, int,
 206                             struct ifnet *, struct pf_state *);
 207 int                      pf_socket_lookup(uid_t *, gid_t *,
 208                             int, struct pf_pdesc *);
 209 u_int8_t                 pf_get_wscale(struct mbuf *, int, u_int16_t,
 210                             sa_family_t);
 211 u_int16_t                pf_get_mss(struct mbuf *, int, u_int16_t,
 212                             sa_family_t);
 213 u_int16_t                pf_calc_mss(struct pf_addr *, sa_family_t,
 214                                 u_int16_t);
 215 void                     pf_set_rt_ifp(struct pf_state *,
 216                             struct pf_addr *);
 217 int                      pf_check_proto_cksum(struct mbuf *, int, int,
 218                             u_int8_t, sa_family_t);
 219 int                      pf_addr_wrap_neq(struct pf_addr_wrap *,
 220                             struct pf_addr_wrap *);
 221 struct pf_state         *pf_find_state_recurse(struct pfi_kif *,
 222                             struct pf_state *, u_int8_t);
 223
 224 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX];
 225
 226 #define STATE_LOOKUP()                                                  \
 227         do {                                                            \
 228                 if (direction == PF_IN)                                 \
 229                         *state = pf_find_state_recurse(         \
 230                             kif, &key, PF_EXT_GWY);                     \
 231                 else                                                    \
 232                         *state = pf_find_state_recurse(         \
 233                             kif, &key, PF_LAN_EXT);                     \
 234                 if (*state == NULL)                                     \
 235                         return (PF_DROP);                               \
 236                 if (direction == PF_OUT &&                              \
 237                     (((*state)->rule.ptr->rt == PF_ROUTETO &&           \
 238                     (*state)->rule.ptr->direction == PF_OUT) ||         \
 239                     ((*state)->rule.ptr->rt == PF_REPLYTO &&            \
 240                     (*state)->rule.ptr->direction == PF_IN)) &&         \
 241                     (*state)->rt_kif != NULL &&                         \
 242                     (*state)->rt_kif != kif)                            \
 243                         return (PF_PASS);                               \
 244         } while (0)
 245
 246 #define STATE_TRANSLATE(s) \
 247         (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \
 248         ((s)->af == AF_INET6 && \
 249         ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \
 250         (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \
 251         (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \
 252         (s)->lan.port != (s)->gwy.port
 253
 254 #define BOUND_IFACE(r, k) (((r)->rule_flag & PFRULE_IFBOUND) ? (k) :   \
 255         ((r)->rule_flag & PFRULE_GRBOUND) ? (k)->pfik_parent :         \
 256         (k)->pfik_parent->pfik_parent)
 257
 258 static int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
 259 static int pf_state_compare_lan_ext(struct pf_state *,
 260         struct pf_state *);
 261 static int pf_state_compare_ext_gwy(struct pf_state *,
 262         struct pf_state *);
 263 static int pf_state_compare_id(struct pf_state *,
 264         struct pf_state *);
 265
 266 struct pf_src_tree tree_src_tracking;
 267
 268 struct pf_state_tree_id tree_id;
 269 struct pf_state_queue state_updates;
 270
 271 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
 272 RB_GENERATE(pf_state_tree_lan_ext, pf_state,
 273     u.s.entry_lan_ext, pf_state_compare_lan_ext);
 274 RB_GENERATE(pf_state_tree_ext_gwy, pf_state,
 275     u.s.entry_ext_gwy, pf_state_compare_ext_gwy);
 276 RB_GENERATE(pf_state_tree_id, pf_state,
 277     u.s.entry_id, pf_state_compare_id);
 278
 279 static int
 280 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
 281 {
 282         int     diff;
 283
 284         if (a->rule.ptr > b->rule.ptr)
 285                 return (1);
 286         if (a->rule.ptr < b->rule.ptr)
 287                 return (-1);
 288         if ((diff = a->af - b->af) != 0)
 289                 return (diff);
 290         switch (a->af) {
 291 #ifdef INET
 292         case AF_INET:
 293                 if (a->addr.addr32[0] > b->addr.addr32[0])
 294                         return (1);
 295                 if (a->addr.addr32[0] < b->addr.addr32[0])
 296                         return (-1);
 297                 break;
 298 #endif /* INET */
 299 #ifdef INET6
 300         case AF_INET6:
 301                 if (a->addr.addr32[3] > b->addr.addr32[3])
 302                         return (1);
 303                 if (a->addr.addr32[3] < b->addr.addr32[3])
 304                         return (-1);
 305                 if (a->addr.addr32[2] > b->addr.addr32[2])
 306                         return (1);
 307                 if (a->addr.addr32[2] < b->addr.addr32[2])
 308                         return (-1);
 309                 if (a->addr.addr32[1] > b->addr.addr32[1])
 310                         return (1);
 311                 if (a->addr.addr32[1] < b->addr.addr32[1])
 312                         return (-1);
 313                 if (a->addr.addr32[0] > b->addr.addr32[0])
 314                         return (1);
 315                 if (a->addr.addr32[0] < b->addr.addr32[0])
 316                         return (-1);
 317                 break;
 318 #endif /* INET6 */
 319         }
 320         return (0);
 321 }
 322
 323 static int
 324 pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b)
 325 {
 326         int     diff;
 327
 328         if ((diff = a->proto - b->proto) != 0)
 329                 return (diff);
 330         if ((diff = a->af - b->af) != 0)
 331                 return (diff);
 332         switch (a->af) {
 333 #ifdef INET
 334         case AF_INET:
 335                 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
 336                         return (1);
 337                 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
 338                         return (-1);
 339                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 340                         return (1);
 341                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 342                         return (-1);
 343                 break;
 344 #endif /* INET */
 345 #ifdef INET6
 346         case AF_INET6:
 347                 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
 348                         return (1);
 349                 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
 350                         return (-1);
 351                 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
 352                         return (1);
 353                 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
 354                         return (-1);
 355                 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
 356                         return (1);
 357                 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
 358                         return (-1);
 359                 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
 360                         return (1);
 361                 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
 362                         return (-1);
 363                 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
 364                         return (1);
 365                 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
 366                         return (-1);
 367                 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
 368                         return (1);
 369                 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
 370                         return (-1);
 371                 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
 372                         return (1);
 373                 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
 374                         return (-1);
 375                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 376                         return (1);
 377                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 378                         return (-1);
 379                 break;
 380 #endif /* INET6 */
 381         }
 382
 383         if ((diff = a->lan.port - b->lan.port) != 0)
 384                 return (diff);
 385         if ((diff = a->ext.port - b->ext.port) != 0)
 386                 return (diff);
 387
 388         return (0);
 389 }
 390
 391 static int
 392 pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b)
 393 {
 394         int     diff;
 395
 396         if ((diff = a->proto - b->proto) != 0)
 397                 return (diff);
 398         if ((diff = a->af - b->af) != 0)
 399                 return (diff);
 400         switch (a->af) {
 401 #ifdef INET
 402         case AF_INET:
 403                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 404                         return (1);
 405                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 406                         return (-1);
 407                 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
 408                         return (1);
 409                 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
 410                         return (-1);
 411                 break;
 412 #endif /* INET */
 413 #ifdef INET6
 414         case AF_INET6:
 415                 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
 416                         return (1);
 417                 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
 418                         return (-1);
 419                 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
 420                         return (1);
 421                 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
 422                         return (-1);
 423                 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
 424                         return (1);
 425                 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
 426                         return (-1);
 427                 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
 428                         return (1);
 429                 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
 430                         return (-1);
 431                 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
 432                         return (1);
 433                 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
 434                         return (-1);
 435                 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
 436                         return (1);
 437                 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
 438                         return (-1);
 439                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 440                         return (1);
 441                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 442                         return (-1);
 443                 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
 444                         return (1);
 445                 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
 446                         return (-1);
 447                 break;
 448 #endif /* INET6 */
 449         }
 450
 451         if ((diff = a->ext.port - b->ext.port) != 0)
 452                 return (diff);
 453         if ((diff = a->gwy.port - b->gwy.port) != 0)
 454                 return (diff);
 455
 456         return (0);
 457 }
 458
 459 static int
 460 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
 461 {
 462         if (a->id > b->id)
 463                 return (1);
 464         if (a->id < b->id)
 465                 return (-1);
 466         if (a->creatorid > b->creatorid)
 467                 return (1);
 468         if (a->creatorid < b->creatorid)
 469                 return (-1);
 470
 471         return (0);
 472 }
 473
 474 #ifdef INET6
 475 void
 476 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 477 {
 478         switch (af) {
 479 #ifdef INET
 480         case AF_INET:
 481                 dst->addr32[0] = src->addr32[0];
 482                 break;
 483 #endif /* INET */
 484         case AF_INET6:
 485                 dst->addr32[0] = src->addr32[0];
 486                 dst->addr32[1] = src->addr32[1];
 487                 dst->addr32[2] = src->addr32[2];
 488                 dst->addr32[3] = src->addr32[3];
 489                 break;
 490         }
 491 }
 492 #endif
 493
 494 struct pf_state *
 495 pf_find_state_byid(struct pf_state *key)
 496 {
 497         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 498         return (RB_FIND(pf_state_tree_id, &tree_id, key));
 499 }
 500
 501 struct pf_state *
 502 pf_find_state_recurse(struct pfi_kif *kif, struct pf_state *key, u_int8_t tree)
 503 {
 504         struct pf_state *s;
 505
 506         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 507
 508         switch (tree) {
 509         case PF_LAN_EXT:
 510                 for (; kif != NULL; kif = kif->pfik_parent) {
 511                         s = RB_FIND(pf_state_tree_lan_ext,
 512                             &kif->pfik_lan_ext, key);
 513                         if (s != NULL)
 514                                 return (s);
 515                 }
 516                 return (NULL);
 517         case PF_EXT_GWY:
 518                 for (; kif != NULL; kif = kif->pfik_parent) {
 519                         s = RB_FIND(pf_state_tree_ext_gwy,
 520                             &kif->pfik_ext_gwy, key);
 521                         if (s != NULL)
 522                                 return (s);
 523                 }
 524                 return (NULL);
 525         default:
 526                 panic("pf_find_state_recurse");
 527         }
 528 }
 529
 530 struct pf_state *
 531 pf_find_state_all(struct pf_state *key, u_int8_t tree, int *more)
 532 {
 533         struct pf_state *s, *ss = NULL;
 534         struct pfi_kif  *kif;
 535
 536         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 537
 538         switch (tree) {
 539         case PF_LAN_EXT:
 540                 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
 541                         s = RB_FIND(pf_state_tree_lan_ext,
 542                             &kif->pfik_lan_ext, key);
 543                         if (s == NULL)
 544                                 continue;
 545                         if (more == NULL)
 546                                 return (s);
 547                         ss = s;
 548                         (*more)++;
 549                 }
 550                 return (ss);
 551         case PF_EXT_GWY:
 552                 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
 553                         s = RB_FIND(pf_state_tree_ext_gwy,
 554                             &kif->pfik_ext_gwy, key);
 555                         if (s == NULL)
 556                                 continue;
 557                         if (more == NULL)
 558                                 return (s);
 559                         ss = s;
 560                         (*more)++;
 561                 }
 562                 return (ss);
 563         default:
 564                 panic("pf_find_state_all");
 565         }
 566 }
 567
 568 int
 569 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 570     struct pf_addr *src, sa_family_t af)
 571 {
 572         struct pf_src_node      k;
 573
 574         if (*sn == NULL) {
 575                 k.af = af;
 576                 PF_ACPY(&k.addr, src, af);
 577                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 578                     rule->rpool.opts & PF_POOL_STICKYADDR)
 579                         k.rule.ptr = rule;
 580                 else
 581                         k.rule.ptr = NULL;
 582                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
 583                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
 584         }
 585         if (*sn == NULL) {
 586                 if (!rule->max_src_nodes ||
 587                     rule->src_nodes < rule->max_src_nodes)
 588                         (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT);
 589                 if ((*sn) == NULL)
 590                         return (-1);
 591                 bzero(*sn, sizeof(struct pf_src_node));
 592                 (*sn)->af = af;
 593                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 594                     rule->rpool.opts & PF_POOL_STICKYADDR)
 595                         (*sn)->rule.ptr = rule;
 596                 else
 597                         (*sn)->rule.ptr = NULL;
 598                 PF_ACPY(&(*sn)->addr, src, af);
 599                 if (RB_INSERT(pf_src_tree,
 600                     &tree_src_tracking, *sn) != NULL) {
 601                         if (pf_status.debug >= PF_DEBUG_MISC) {
 602                                 printf("pf: src_tree insert failed: ");
 603                                 pf_print_host(&(*sn)->addr, 0, af);
 604                                 printf("\n");
 605                         }
 606                         pool_put(&pf_src_tree_pl, *sn);
 607                         return (-1);
 608                 }
 609                 (*sn)->creation = time_second;
 610                 (*sn)->ruletype = rule->action;
 611                 if ((*sn)->rule.ptr != NULL)
 612                         (*sn)->rule.ptr->src_nodes++;
 613                 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
 614                 pf_status.src_nodes++;
 615         } else {
 616                 if (rule->max_src_states &&
 617                     (*sn)->states >= rule->max_src_states)
 618                         return (-1);
 619         }
 620         return (0);
 621 }
 622
 623 int
 624 pf_insert_state(struct pfi_kif *kif, struct pf_state *state)
 625 {
 626         /* Thou MUST NOT insert multiple duplicate keys */
 627         state->u.s.kif = kif;
 628         if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) {
 629                 if (pf_status.debug >= PF_DEBUG_MISC) {
 630                         printf("pf: state insert failed: tree_lan_ext");
 631                         printf(" lan: ");
 632                         pf_print_host(&state->lan.addr, state->lan.port,
 633                             state->af);
 634                         printf(" gwy: ");
 635                         pf_print_host(&state->gwy.addr, state->gwy.port,
 636                             state->af);
 637                         printf(" ext: ");
 638                         pf_print_host(&state->ext.addr, state->ext.port,
 639                             state->af);
 640                         if (state->sync_flags & PFSTATE_FROMSYNC)
 641                                 printf(" (from sync)");
 642                         printf("\n");
 643                 }
 644                 return (-1);
 645         }
 646
 647         if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) {
 648                 if (pf_status.debug >= PF_DEBUG_MISC) {
 649                         printf("pf: state insert failed: tree_ext_gwy");
 650                         printf(" lan: ");
 651                         pf_print_host(&state->lan.addr, state->lan.port,
 652                             state->af);
 653                         printf(" gwy: ");
 654                         pf_print_host(&state->gwy.addr, state->gwy.port,
 655                             state->af);
 656                         printf(" ext: ");
 657                         pf_print_host(&state->ext.addr, state->ext.port,
 658                             state->af);
 659                         if (state->sync_flags & PFSTATE_FROMSYNC)
 660                                 printf(" (from sync)");
 661                         printf("\n");
 662                 }
 663                 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
 664                 return (-1);
 665         }
 666
 667         if (state->id == 0 && state->creatorid == 0) {
 668                 state->id = htobe64(pf_status.stateid++);
 669                 state->creatorid = pf_status.hostid;
 670         }
 671         if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) {
 672                 if (pf_status.debug >= PF_DEBUG_MISC) {
 673                         printf("pf: state insert failed: "
 674                             "id: %016" PRIx64 " creatorid: %08" PRIx32,
 675                             be64toh(state->id), ntohl(state->creatorid));
 676                         if (state->sync_flags & PFSTATE_FROMSYNC)
 677                                 printf(" (from sync)");
 678                         printf("\n");
 679                 }
 680                 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
 681                 RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state);
 682                 return (-1);
 683         }
 684         TAILQ_INSERT_HEAD(&state_updates, state, u.s.entry_updates);
 685
 686         pf_status.fcounters[FCNT_STATE_INSERT]++;
 687         pf_status.states++;
 688         pfi_attach_state(kif);
 689 #if NPFSYNC
 690         pfsync_insert_state(state);
 691 #endif
 692         return (0);
 693 }
 694
 695 void
 696 pf_purge_timeout(void *arg)
 697 {
 698         struct callout  *to = arg;
 699         int              s;
 700
 701         s = splsoftnet();
 702         pf_purge_expired_states();
 703         pf_purge_expired_fragments();
 704         pf_purge_expired_src_nodes();
 705         splx(s);
 706
 707         callout_reset(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz,
 708             pf_purge_timeout, to);
 709 }
 710
 711 u_int32_t
 712 pf_state_expires(const struct pf_state *state)
 713 {
 714         u_int32_t       timeout;
 715         u_int32_t       start;
 716         u_int32_t       end;
 717         u_int32_t       states;
 718
 719         /* handle all PFTM_* > PFTM_MAX here */
 720         if (state->timeout == PFTM_PURGE)
 721                 return (time_second);
 722         if (state->timeout == PFTM_UNTIL_PACKET)
 723                 return (0);
 724         KASSERT((state->timeout < PFTM_MAX),
 725             ("pf_state_expires: timeout > PFTM_MAX"));
 726         timeout = state->rule.ptr->timeout[state->timeout];
 727         if (!timeout)
 728                 timeout = pf_default_rule.timeout[state->timeout];
 729         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
 730         if (start) {
 731                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
 732                 states = state->rule.ptr->states;
 733         } else {
 734                 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
 735                 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
 736                 states = pf_status.states;
 737         }
 738         if (end && states > start && start < end) {
 739                 if (states < end)
 740                         return (state->expire + timeout * (end - states) /
 741                             (end - start));
 742                 else
 743                         return (time_second);
 744         }
 745         return (state->expire + timeout);
 746 }
 747
 748 void
 749 pf_purge_expired_src_nodes(void)
 750 {
 751          struct pf_src_node             *cur, *next;
 752
 753          for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
 754                  next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
 755
 756                  if (cur->states <= 0 && cur->expire <= time_second) {
 757                          if (cur->rule.ptr != NULL) {
 758                                  cur->rule.ptr->src_nodes--;
 759                                  if (cur->rule.ptr->states <= 0 &&
 760                                      cur->rule.ptr->max_src_nodes <= 0)
 761                                          pf_rm_rule(NULL, cur->rule.ptr);
 762                          }
 763                          RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
 764                          pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
 765                          pf_status.src_nodes--;
 766                          pool_put(&pf_src_tree_pl, cur);
 767                  }
 768          }
 769 }
 770
 771 void
 772 pf_src_tree_remove_state(struct pf_state *s)
 773 {
 774         u_int32_t timeout;
 775
 776         if (s->src_node != NULL) {
 777                 if (--s->src_node->states <= 0) {
 778                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
 779                         if (!timeout)
 780                                 timeout =
 781                                     pf_default_rule.timeout[PFTM_SRC_NODE];
 782                         s->src_node->expire = time_second + timeout;
 783                 }
 784         }
 785         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
 786                 if (--s->nat_src_node->states <= 0) {
 787                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
 788                         if (!timeout)
 789                                 timeout =
 790                                     pf_default_rule.timeout[PFTM_SRC_NODE];
 791                         s->nat_src_node->expire = time_second + timeout;
 792                 }
 793         }
 794         s->src_node = s->nat_src_node = NULL;
 795 }
 796
 797 void
 798 pf_purge_expired_states(void)
 799 {
 800         struct pf_state         *cur, *next;
 801
 802         for (cur = RB_MIN(pf_state_tree_id, &tree_id);
 803             cur; cur = next) {
 804                 next = RB_NEXT(pf_state_tree_id, &tree_id, cur);
 805
 806                 if (pf_state_expires(cur) <= time_second) {
 807                         if (cur->src.state == PF_TCPS_PROXY_DST)
 808                                 pf_send_tcp(cur->rule.ptr, cur->af,
 809                                     &cur->ext.addr, &cur->lan.addr,
 810                                     cur->ext.port, cur->lan.port,
 811                                     cur->src.seqhi, cur->src.seqlo + 1, 0,
 812                                     TH_RST|TH_ACK, 0, 0);
 813                         RB_REMOVE(pf_state_tree_ext_gwy,
 814                             &cur->u.s.kif->pfik_ext_gwy, cur);
 815                         RB_REMOVE(pf_state_tree_lan_ext,
 816                             &cur->u.s.kif->pfik_lan_ext, cur);
 817                         RB_REMOVE(pf_state_tree_id, &tree_id, cur);
 818 #if NPFSYNC
 819                         pfsync_delete_state(cur);
 820 #endif
 821                         pf_src_tree_remove_state(cur);
 822                         if (--cur->rule.ptr->states <= 0 &&
 823                             cur->rule.ptr->src_nodes <= 0)
 824                                 pf_rm_rule(NULL, cur->rule.ptr);
 825                         if (cur->nat_rule.ptr != NULL)
 826                                 if (--cur->nat_rule.ptr->states <= 0 &&
 827                                         cur->nat_rule.ptr->src_nodes <= 0)
 828                                         pf_rm_rule(NULL, cur->nat_rule.ptr);
 829                         if (cur->anchor.ptr != NULL)
 830                                 if (--cur->anchor.ptr->states <= 0)
 831                                         pf_rm_rule(NULL, cur->anchor.ptr);
 832                         pf_normalize_tcp_cleanup(cur);
 833                         pfi_detach_state(cur->u.s.kif);
 834                         TAILQ_REMOVE(&state_updates, cur, u.s.entry_updates);
 835                         pool_put(&pf_state_pl, cur);
 836                         pf_status.fcounters[FCNT_STATE_REMOVALS]++;
 837                         pf_status.states--;
 838                 }
 839         }
 840 }
 841
 842 int
 843 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
 844 {
 845         if (aw->type != PF_ADDR_TABLE)
 846                 return (0);
 847         if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
 848                 return (1);
 849         return (0);
 850 }
 851
 852 void
 853 pf_tbladdr_remove(struct pf_addr_wrap *aw)
 854 {
 855         if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
 856                 return;
 857         pfr_detach_table(aw->p.tbl);
 858         aw->p.tbl = NULL;
 859 }
 860
 861 void
 862 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
 863 {
 864         struct pfr_ktable *kt = aw->p.tbl;
 865
 866         if (aw->type != PF_ADDR_TABLE || kt == NULL)
 867                 return;
 868         if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
 869                 kt = kt->pfrkt_root;
 870         aw->p.tbl = NULL;
 871         aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
 872                 kt->pfrkt_cnt : -1;
 873 }
 874
 875 void
 876 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
 877 {
 878         switch (af) {
 879 #ifdef INET
 880         case AF_INET: {
 881                 u_int32_t a = ntohl(addr->addr32[0]);
 882                 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
 883                     (a>>8)&255, a&255);
 884                 if (p) {
 885                         p = ntohs(p);
 886                         printf(":%u", p);
 887                 }
 888                 break;
 889         }
 890 #endif /* INET */
 891 #ifdef INET6
 892         case AF_INET6: {
 893                 u_int16_t b;
 894                 u_int8_t i, curstart = 255, curend = 0,
 895                     maxstart = 0, maxend = 0;
 896                 for (i = 0; i < 8; i++) {
 897                         if (!addr->addr16[i]) {
 898                                 if (curstart == 255)
 899                                         curstart = i;
 900                                 else
 901                                         curend = i;
 902                         } else {
 903                                 if (curstart) {
 904                                         if ((curend - curstart) >
 905                                             (maxend - maxstart)) {
 906                                                 maxstart = curstart;
 907                                                 maxend = curend;
 908                                                 curstart = 255;
 909                                         }
 910                                 }
 911                         }
 912                 }
 913                 for (i = 0; i < 8; i++) {
 914                         if (i >= maxstart && i <= maxend) {
 915                                 if (maxend != 7) {
 916                                         if (i == maxstart)
 917                                                 printf(":");
 918                                 } else {
 919                                         if (i == maxend)
 920                                                 printf(":");
 921                                 }
 922                         } else {
 923                                 b = ntohs(addr->addr16[i]);
 924                                 printf("%x", b);
 925                                 if (i < 7)
 926                                         printf(":");
 927                         }
 928                 }
 929                 if (p) {
 930                         p = ntohs(p);
 931                         printf("[%u]", p);
 932                 }
 933                 break;
 934         }
 935 #endif /* INET6 */
 936         }
 937 }
 938
 939 void
 940 pf_print_state(struct pf_state *s)
 941 {
 942         switch (s->proto) {
 943         case IPPROTO_TCP:
 944                 printf("TCP ");
 945                 break;
 946         case IPPROTO_UDP:
 947                 printf("UDP ");
 948                 break;
 949         case IPPROTO_ICMP:
 950                 printf("ICMP ");
 951                 break;
 952         case IPPROTO_ICMPV6:
 953                 printf("ICMPV6 ");
 954                 break;
 955         default:
 956                 printf("%u ", s->proto);
 957                 break;
 958         }
 959         pf_print_host(&s->lan.addr, s->lan.port, s->af);
 960         printf(" ");
 961         pf_print_host(&s->gwy.addr, s->gwy.port, s->af);
 962         printf(" ");
 963         pf_print_host(&s->ext.addr, s->ext.port, s->af);
 964         printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
 965             s->src.seqhi, s->src.max_win, s->src.seqdiff);
 966         if (s->src.wscale && s->dst.wscale)
 967                 printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
 968         printf("]");
 969         printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
 970             s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
 971         if (s->src.wscale && s->dst.wscale)
 972                 printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
 973         printf("]");
 974         printf(" %u:%u", s->src.state, s->dst.state);
 975 }
 976
 977 void
 978 pf_print_flags(u_int8_t f)
 979 {
 980         if (f)
 981                 printf(" ");
 982         if (f & TH_FIN)
 983                 printf("F");
 984         if (f & TH_SYN)
 985                 printf("S");
 986         if (f & TH_RST)
 987                 printf("R");
 988         if (f & TH_PUSH)
 989                 printf("P");
 990         if (f & TH_ACK)
 991                 printf("A");
 992         if (f & TH_URG)
 993                 printf("U");
 994         if (f & TH_ECE)
 995                 printf("E");
 996         if (f & TH_CWR)
 997                 printf("W");
 998 }
 999
1000 #define PF_SET_SKIP_STEPS(i)                                    \
1001         do {                                                    \
1002                 while (head[i] != cur) {                        \
1003                         head[i]->skip[i].ptr = cur;             \
1004                         head[i] = TAILQ_NEXT(head[i], entries); \
1005                 }                                               \
1006         } while (0)
1007
1008 void
1009 pf_calc_skip_steps(struct pf_rulequeue *rules)
1010 {
1011         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1012         int i;
1013
1014         cur = TAILQ_FIRST(rules);
1015         prev = cur;
1016         for (i = 0; i < PF_SKIP_COUNT; ++i)
1017                 head[i] = cur;
1018         while (cur != NULL) {
1019
1020                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1021                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1022                 if (cur->direction != prev->direction)
1023                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1024                 if (cur->af != prev->af)
1025                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
1026                 if (cur->proto != prev->proto)
1027                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1028                 if (cur->src.not != prev->src.not ||
1029                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1030                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1031                 if (cur->src.port[0] != prev->src.port[0] ||
1032                     cur->src.port[1] != prev->src.port[1] ||
1033                     cur->src.port_op != prev->src.port_op)
1034                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1035                 if (cur->dst.not != prev->dst.not ||
1036                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1037                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1038                 if (cur->dst.port[0] != prev->dst.port[0] ||
1039                     cur->dst.port[1] != prev->dst.port[1] ||
1040                     cur->dst.port_op != prev->dst.port_op)
1041                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1042
1043                 prev = cur;
1044                 cur = TAILQ_NEXT(cur, entries);
1045         }
1046         for (i = 0; i < PF_SKIP_COUNT; ++i)
1047                 PF_SET_SKIP_STEPS(i);
1048 }
1049
1050 int
1051 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1052 {
1053         if (aw1->type != aw2->type)
1054                 return (1);
1055         switch (aw1->type) {
1056         case PF_ADDR_ADDRMASK:
1057                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1058                         return (1);
1059                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1060                         return (1);
1061                 return (0);
1062         case PF_ADDR_DYNIFTL:
1063                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1064         case PF_ADDR_NOROUTE:
1065                 return (0);
1066         case PF_ADDR_TABLE:
1067                 return (aw1->p.tbl != aw2->p.tbl);
1068         default:
1069                 printf("invalid address type: %d\n", aw1->type);
1070                 return (1);
1071         }
1072 }
1073
1074 void
1075 pf_update_anchor_rules()
1076 {
1077         struct pf_rule  *rule;
1078         int              i;
1079
1080         for (i = 0; i < PF_RULESET_MAX; ++i)
1081                 TAILQ_FOREACH(rule, pf_main_ruleset.rules[i].active.ptr,
1082                     entries)
1083                         if (rule->anchorname[0])
1084                                 rule->anchor = pf_find_anchor(rule->anchorname);
1085                         else
1086                                 rule->anchor = NULL;
1087 }
1088
1089 u_int16_t
1090 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1091 {
1092         u_int32_t       l;
1093
1094         if (udp && !cksum)
1095                 return (0x0000);
1096         l = cksum + old - new;
1097         l = (l >> 16) + (l & 65535);
1098         l = l & 65535;
1099         if (udp && !l)
1100                 return (0xFFFF);
1101         return (l);
1102 }
1103
1104 void
1105 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1106     struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1107 {
1108         struct pf_addr  ao;
1109         u_int16_t       po = *p;
1110
1111         PF_ACPY(&ao, a, af);
1112         PF_ACPY(a, an, af);
1113
1114         *p = pn;
1115
1116         switch (af) {
1117 #ifdef INET
1118         case AF_INET:
1119                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1120                     ao.addr16[0], an->addr16[0], 0),
1121                     ao.addr16[1], an->addr16[1], 0);
1122                 *p = pn;
1123                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1124                     ao.addr16[0], an->addr16[0], u),
1125                     ao.addr16[1], an->addr16[1], u),
1126                     po, pn, u);
1127                 break;
1128 #endif /* INET */
1129 #ifdef INET6
1130         case AF_INET6:
1131                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1132                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1133                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1134                     ao.addr16[0], an->addr16[0], u),
1135                     ao.addr16[1], an->addr16[1], u),
1136                     ao.addr16[2], an->addr16[2], u),
1137                     ao.addr16[3], an->addr16[3], u),
1138                     ao.addr16[4], an->addr16[4], u),
1139                     ao.addr16[5], an->addr16[5], u),
1140                     ao.addr16[6], an->addr16[6], u),
1141                     ao.addr16[7], an->addr16[7], u),
1142                     po, pn, u);
1143                 break;
1144 #endif /* INET6 */
1145         }
1146 }
1147
1148
1149 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
1150 void
1151 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1152 {
1153         u_int32_t       ao;
1154
1155         memcpy(&ao, a, sizeof(ao));
1156         memcpy(a, &an, sizeof(u_int32_t));
1157         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1158             ao % 65536, an % 65536, u);
1159 }
1160
1161 #ifdef INET6
1162 void
1163 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1164 {
1165         struct pf_addr  ao;
1166
1167         PF_ACPY(&ao, a, AF_INET6);
1168         PF_ACPY(a, an, AF_INET6);
1169
1170         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1171             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1172             pf_cksum_fixup(pf_cksum_fixup(*c,
1173             ao.addr16[0], an->addr16[0], u),
1174             ao.addr16[1], an->addr16[1], u),
1175             ao.addr16[2], an->addr16[2], u),
1176             ao.addr16[3], an->addr16[3], u),
1177             ao.addr16[4], an->addr16[4], u),
1178             ao.addr16[5], an->addr16[5], u),
1179             ao.addr16[6], an->addr16[6], u),
1180             ao.addr16[7], an->addr16[7], u);
1181 }
1182 #endif /* INET6 */
1183
1184 void
1185 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1186     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1187     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1188 {
1189         struct pf_addr  oia, ooa;
1190
1191         PF_ACPY(&oia, ia, af);
1192         PF_ACPY(&ooa, oa, af);
1193
1194         /* Change inner protocol port, fix inner protocol checksum. */
1195         if (ip != NULL) {
1196                 u_int16_t       oip = *ip;
1197                 u_int32_t       opc = 0;
1198
1199                 if (pc != NULL)
1200                         opc = *pc;
1201                 *ip = np;
1202                 if (pc != NULL)
1203                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1204                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1205                 if (pc != NULL)
1206                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1207         }
1208         /* Change inner ip address, fix inner ip and icmp checksums. */
1209         PF_ACPY(ia, na, af);
1210         switch (af) {
1211 #ifdef INET
1212         case AF_INET: {
1213                 u_int32_t        oh2c = *h2c;
1214
1215                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1216                     oia.addr16[0], ia->addr16[0], 0),
1217                     oia.addr16[1], ia->addr16[1], 0);
1218                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1219                     oia.addr16[0], ia->addr16[0], 0),
1220                     oia.addr16[1], ia->addr16[1], 0);
1221                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1222                 break;
1223         }
1224 #endif /* INET */
1225 #ifdef INET6
1226         case AF_INET6:
1227                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1228                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1229                     pf_cksum_fixup(pf_cksum_fixup(*ic,
1230                     oia.addr16[0], ia->addr16[0], u),
1231                     oia.addr16[1], ia->addr16[1], u),
1232                     oia.addr16[2], ia->addr16[2], u),
1233                     oia.addr16[3], ia->addr16[3], u),
1234                     oia.addr16[4], ia->addr16[4], u),
1235                     oia.addr16[5], ia->addr16[5], u),
1236                     oia.addr16[6], ia->addr16[6], u),
1237                     oia.addr16[7], ia->addr16[7], u);
1238                 break;
1239 #endif /* INET6 */
1240         }
1241         /* Change outer ip address, fix outer ip or icmpv6 checksum. */
1242         PF_ACPY(oa, na, af);
1243         switch (af) {
1244 #ifdef INET
1245         case AF_INET:
1246                 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1247                     ooa.addr16[0], oa->addr16[0], 0),
1248                     ooa.addr16[1], oa->addr16[1], 0);
1249                 break;
1250 #endif /* INET */
1251 #ifdef INET6
1252         case AF_INET6:
1253                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1254                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1255                     pf_cksum_fixup(pf_cksum_fixup(*ic,
1256                     ooa.addr16[0], oa->addr16[0], u),
1257                     ooa.addr16[1], oa->addr16[1], u),
1258                     ooa.addr16[2], oa->addr16[2], u),
1259                     ooa.addr16[3], oa->addr16[3], u),
1260                     ooa.addr16[4], oa->addr16[4], u),
1261                     ooa.addr16[5], oa->addr16[5], u),
1262                     ooa.addr16[6], oa->addr16[6], u),
1263                     ooa.addr16[7], oa->addr16[7], u);
1264                 break;
1265 #endif /* INET6 */
1266         }
1267 }
1268
1269 void
1270 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1271     const struct pf_addr *saddr, const struct pf_addr *daddr,
1272     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1273     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl)
1274 {
1275         struct mbuf     *m;
1276         int              len = 0, tlen;
1277 #ifdef INET
1278         struct ip       *h = NULL;
1279 #endif /* INET */
1280 #ifdef INET6
1281         struct ip6_hdr  *h6 = NULL;
1282 #endif /* INET6 */
1283         struct tcphdr   *th = NULL;
1284         char *opt;
1285
1286         /* maximum segment size tcp option */
1287         tlen = sizeof(struct tcphdr);
1288         if (mss)
1289                 tlen += 4;
1290
1291         switch (af) {
1292 #ifdef INET
1293         case AF_INET:
1294                 len = sizeof(struct ip) + tlen;
1295                 break;
1296 #endif /* INET */
1297 #ifdef INET6
1298         case AF_INET6:
1299                 len = sizeof(struct ip6_hdr) + tlen;
1300                 break;
1301 #endif /* INET6 */
1302         }
1303
1304         /* create outgoing mbuf */
1305         m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1306         if (m == NULL)
1307                 return;
1308         m->m_pkthdr.pf_flags |= PF_MBUF_GENERATED;
1309 #ifdef ALTQ
1310         if (r != NULL && r->qid) {
1311                 struct altq_tag *atag;
1312
1313                 mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), MB_DONTWAIT);
1314                 if (mtag != NULL) {
1315                         atag = (struct altq_tag *)(mtag + 1);
1316                         atag->qid = r->qid;
1317                         /* add hints for ecn */
1318                         atag->af = af;
1319                         atag->hdr = mtod(m, struct ip *);
1320                         m_tag_prepend(m, mtag);
1321                 }
1322         }
1323 #endif
1324         m->m_data += max_linkhdr;
1325         m->m_pkthdr.len = m->m_len = len;
1326         m->m_pkthdr.rcvif = NULL;
1327         bzero(m->m_data, len);
1328         switch (af) {
1329 #ifdef INET
1330         case AF_INET:
1331                 h = mtod(m, struct ip *);
1332
1333                 /* IP header fields included in the TCP checksum */
1334                 h->ip_p = IPPROTO_TCP;
1335                 h->ip_len = tlen;
1336                 h->ip_src.s_addr = saddr->v4.s_addr;
1337                 h->ip_dst.s_addr = daddr->v4.s_addr;
1338
1339                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1340                 break;
1341 #endif /* INET */
1342 #ifdef INET6
1343         case AF_INET6:
1344                 h6 = mtod(m, struct ip6_hdr *);
1345
1346                 /* IP header fields included in the TCP checksum */
1347                 h6->ip6_nxt = IPPROTO_TCP;
1348                 h6->ip6_plen = htons(tlen);
1349                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1350                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1351
1352                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1353                 break;
1354 #endif /* INET6 */
1355         }
1356
1357         /* TCP header */
1358         th->th_sport = sport;
1359         th->th_dport = dport;
1360         th->th_seq = htonl(seq);
1361         th->th_ack = htonl(ack);
1362         th->th_off = tlen >> 2;
1363         th->th_flags = flags;
1364         th->th_win = htons(win);
1365
1366         if (mss) {
1367                 opt = (char *)(th + 1);
1368                 opt[0] = TCPOPT_MAXSEG;
1369                 opt[1] = 4;
1370                 mss = htons(mss);
1371                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1372         }
1373
1374         switch (af) {
1375 #ifdef INET
1376         case AF_INET:
1377                 /* TCP checksum */
1378                 th->th_sum = in_cksum(m, len);
1379
1380                 /* Finish the IP header */
1381                 h->ip_v = 4;
1382                 h->ip_hl = sizeof(*h) >> 2;
1383                 h->ip_tos = IPTOS_LOWDELAY;
1384                 h->ip_len = len;
1385                 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1386                 h->ip_ttl = ttl ? ttl : ip_defttl;
1387                 h->ip_sum = 0;
1388                 ip_output(m, (void *)NULL, (void *)NULL, 0, (void *)NULL,
1389                     (void *)NULL);
1390                 break;
1391 #endif /* INET */
1392 #ifdef INET6
1393         case AF_INET6:
1394                 /* TCP checksum */
1395                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1396                     sizeof(struct ip6_hdr), tlen);
1397
1398                 h6->ip6_vfc |= IPV6_VERSION;
1399                 h6->ip6_hlim = IPV6_DEFHLIM;
1400
1401                 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
1402                 break;
1403 #endif /* INET6 */
1404         }
1405 }
1406
1407 void
1408 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1409     struct pf_rule *r)
1410 {
1411         struct mbuf     *m0;
1412
1413         m0 = m_copypacket(m, MB_DONTWAIT);
1414         if (m0 == NULL)
1415                 return;
1416         m0->m_pkthdr.pf_flags |= PF_MBUF_GENERATED;
1417
1418 #ifdef ALTQ
1419         if (r->qid) {
1420                 struct altq_tag *atag;
1421
1422                 mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), MB_DONTWAIT);
1423                 if (mtag != NULL) {
1424                         atag = (struct altq_tag *)(mtag + 1);
1425                         atag->qid = r->qid;
1426                         /* add hints for ecn */
1427                         atag->af = af;
1428                         atag->hdr = mtod(m0, struct ip *);
1429                         m_tag_prepend(m0, mtag);
1430                 }
1431         }
1432 #endif
1433
1434         switch (af) {
1435 #ifdef INET
1436         case AF_INET:
1437                 icmp_error(m0, type, code, 0, (void *)NULL);
1438                 break;
1439 #endif /* INET */
1440 #ifdef INET6
1441         case AF_INET6:
1442                 icmp6_error(m0, type, code, 0);
1443                 break;
1444 #endif /* INET6 */
1445         }
1446 }
1447
1448 /*
1449  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1450  * If n is 0, they match if they are equal. If n is != 0, they match if they
1451  * are different.
1452  */
1453 int
1454 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1455     struct pf_addr *b, sa_family_t af)
1456 {
1457         int     match = 0;
1458
1459         switch (af) {
1460 #ifdef INET
1461         case AF_INET:
1462                 if ((a->addr32[0] & m->addr32[0]) ==
1463                     (b->addr32[0] & m->addr32[0]))
1464                         match++;
1465                 break;
1466 #endif /* INET */
1467 #ifdef INET6
1468         case AF_INET6:
1469                 if (((a->addr32[0] & m->addr32[0]) ==
1470                      (b->addr32[0] & m->addr32[0])) &&
1471                     ((a->addr32[1] & m->addr32[1]) ==
1472                      (b->addr32[1] & m->addr32[1])) &&
1473                     ((a->addr32[2] & m->addr32[2]) ==
1474                      (b->addr32[2] & m->addr32[2])) &&
1475                     ((a->addr32[3] & m->addr32[3]) ==
1476                      (b->addr32[3] & m->addr32[3])))
1477                         match++;
1478                 break;
1479 #endif /* INET6 */
1480         }
1481         if (match) {
1482                 if (n)
1483                         return (0);
1484                 else
1485                         return (1);
1486         } else {
1487                 if (n)
1488                         return (1);
1489                 else
1490                         return (0);
1491         }
1492 }
1493
1494 int
1495 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
1496 {
1497         switch (op) {
1498         case PF_OP_IRG:
1499                 return ((p > a1) && (p < a2));
1500         case PF_OP_XRG:
1501                 return ((p < a1) || (p > a2));
1502         case PF_OP_RRG:
1503                 return ((p >= a1) && (p <= a2));
1504         case PF_OP_EQ:
1505                 return (p == a1);
1506         case PF_OP_NE:
1507                 return (p != a1);
1508         case PF_OP_LT:
1509                 return (p < a1);
1510         case PF_OP_LE:
1511                 return (p <= a1);
1512         case PF_OP_GT:
1513                 return (p > a1);
1514         case PF_OP_GE:
1515                 return (p >= a1);
1516         }
1517         return (0); /* never reached */
1518 }
1519
1520 int
1521 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
1522 {
1523         a1 = ntohs(a1);
1524         a2 = ntohs(a2);
1525         p = ntohs(p);
1526         return (pf_match(op, a1, a2, p));
1527 }
1528
1529 int
1530 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
1531 {
1532         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1533                 return (0);
1534         return (pf_match(op, a1, a2, u));
1535 }
1536
1537 int
1538 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
1539 {
1540         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1541                 return (0);
1542         return (pf_match(op, a1, a2, g));
1543 }
1544
1545 static int
1546 pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_rule *nat_rule,
1547              int *tag)
1548 {
1549         if (*tag == -1) {       /* find mbuf tag */
1550                 if (nat_rule != NULL && nat_rule->tag)
1551                         *tag = nat_rule->tag;
1552                 else if (m->m_pkthdr.pf_flags & PF_MBUF_TAGGED)
1553                         *tag = m->m_pkthdr.pf_tag;
1554                 else
1555                         *tag = 0;
1556         }
1557
1558         return ((!r->match_tag_not && r->match_tag == *tag) ||
1559             (r->match_tag_not && r->match_tag != *tag));
1560 }
1561
1562 void
1563 pf_tag_packet(struct mbuf *m, int tag)
1564 {
1565         if (tag <= 0)
1566                 return;
1567
1568         m->m_pkthdr.pf_flags |= PF_MBUF_TAGGED;
1569         m->m_pkthdr.pf_tag = tag;
1570 }
1571
1572 #define PF_STEP_INTO_ANCHOR(r, a, s, n)                                 \
1573         do {                                                            \
1574                 if ((r) == NULL || (r)->anchor == NULL ||               \
1575                     (s) != NULL || (a) != NULL)                         \
1576                         panic("PF_STEP_INTO_ANCHOR");                   \
1577                 (a) = (r);                                              \
1578                 (s) = TAILQ_FIRST(&(r)->anchor->rulesets);              \
1579                 (r) = NULL;                                             \
1580                 while ((s) != NULL && ((r) =                            \
1581                     TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL)     \
1582                         (s) = TAILQ_NEXT((s), entries);                 \
1583                 if ((r) == NULL) {                                      \
1584                         (r) = TAILQ_NEXT((a), entries);                 \
1585                         (a) = NULL;                                     \
1586                 }                                                       \
1587         } while (0)
1588
1589 #define PF_STEP_OUT_OF_ANCHOR(r, a, s, n)                               \
1590         do {                                                            \
1591                 if ((r) != NULL || (a) == NULL || (s) == NULL)          \
1592                         panic("PF_STEP_OUT_OF_ANCHOR");                 \
1593                 (s) = TAILQ_NEXT((s), entries);                         \
1594                 while ((s) != NULL && ((r) =                            \
1595                     TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL)     \
1596                         (s) = TAILQ_NEXT((s), entries);                 \
1597                 if ((r) == NULL) {                                      \
1598                         (r) = TAILQ_NEXT((a), entries);                 \
1599                         (a) = NULL;                                     \
1600                 }                                                       \
1601         } while (0)
1602
1603 #ifdef INET6
1604 void
1605 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
1606     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
1607 {
1608         switch (af) {
1609 #ifdef INET
1610         case AF_INET:
1611                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
1612                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
1613                 break;
1614 #endif /* INET */
1615         case AF_INET6:
1616                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
1617                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
1618                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
1619                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
1620                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
1621                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
1622                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
1623                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
1624                 break;
1625         }
1626 }
1627
1628 void
1629 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
1630 {
1631         switch (af) {
1632 #ifdef INET
1633         case AF_INET:
1634                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
1635                 break;
1636 #endif /* INET */
1637         case AF_INET6:
1638                 if (addr->addr32[3] == 0xffffffff) {
1639                         addr->addr32[3] = 0;
1640                         if (addr->addr32[2] == 0xffffffff) {
1641                                 addr->addr32[2] = 0;
1642                                 if (addr->addr32[1] == 0xffffffff) {
1643                                         addr->addr32[1] = 0;
1644                                         addr->addr32[0] =
1645                                             htonl(ntohl(addr->addr32[0]) + 1);
1646                                 } else
1647                                         addr->addr32[1] =
1648                                             htonl(ntohl(addr->addr32[1]) + 1);
1649                         } else
1650                                 addr->addr32[2] =
1651                                     htonl(ntohl(addr->addr32[2]) + 1);
1652                 } else
1653                         addr->addr32[3] =
1654                             htonl(ntohl(addr->addr32[3]) + 1);
1655                 break;
1656         }
1657 }
1658 #endif /* INET6 */
1659
1660 #define mix(a,b,c) \
1661         do {                                    \
1662                 a -= b; a -= c; a ^= (c >> 13); \
1663                 b -= c; b -= a; b ^= (a << 8);  \
1664                 c -= a; c -= b; c ^= (b >> 13); \
1665                 a -= b; a -= c; a ^= (c >> 12); \
1666                 b -= c; b -= a; b ^= (a << 16); \
1667                 c -= a; c -= b; c ^= (b >> 5);  \
1668                 a -= b; a -= c; a ^= (c >> 3);  \
1669                 b -= c; b -= a; b ^= (a << 10); \
1670                 c -= a; c -= b; c ^= (b >> 15); \
1671         } while (0)
1672
1673 /*
1674  * hash function based on bridge_hash in if_bridge.c
1675  */
1676 void
1677 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
1678     struct pf_poolhashkey *key, sa_family_t af)
1679 {
1680         u_int32_t       a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
1681
1682         switch (af) {
1683 #ifdef INET
1684         case AF_INET:
1685                 a += inaddr->addr32[0];
1686                 b += key->key32[1];
1687                 mix(a, b, c);
1688                 hash->addr32[0] = c + key->key32[2];
1689                 break;
1690 #endif /* INET */
1691 #ifdef INET6
1692         case AF_INET6:
1693                 a += inaddr->addr32[0];
1694                 b += inaddr->addr32[2];
1695                 mix(a, b, c);
1696                 hash->addr32[0] = c;
1697                 a += inaddr->addr32[1];
1698                 b += inaddr->addr32[3];
1699                 c += key->key32[1];
1700                 mix(a, b, c);
1701                 hash->addr32[1] = c;
1702                 a += inaddr->addr32[2];
1703                 b += inaddr->addr32[1];
1704                 c += key->key32[2];
1705                 mix(a, b, c);
1706                 hash->addr32[2] = c;
1707                 a += inaddr->addr32[3];
1708                 b += inaddr->addr32[0];
1709                 c += key->key32[3];
1710                 mix(a, b, c);
1711                 hash->addr32[3] = c;
1712                 break;
1713 #endif /* INET6 */
1714         }
1715 }
1716
1717 int
1718 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
1719     struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
1720 {
1721         unsigned char            hash[16];
1722         struct pf_pool          *rpool = &r->rpool;
1723         struct pf_addr          *raddr = &rpool->cur->addr.v.a.addr;
1724         struct pf_addr          *rmask = &rpool->cur->addr.v.a.mask;
1725         struct pf_pooladdr      *acur = rpool->cur;
1726         struct pf_src_node       k;
1727
1728         if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
1729             (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
1730                 k.af = af;
1731                 PF_ACPY(&k.addr, saddr, af);
1732                 if (r->rule_flag & PFRULE_RULESRCTRACK ||
1733                     r->rpool.opts & PF_POOL_STICKYADDR)
1734                         k.rule.ptr = r;
1735                 else
1736                         k.rule.ptr = NULL;
1737                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
1738                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
1739                 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
1740                         PF_ACPY(naddr, &(*sn)->raddr, af);
1741                         if (pf_status.debug >= PF_DEBUG_MISC) {
1742                                 printf("pf_map_addr: src tracking maps ");
1743                                 pf_print_host(&k.addr, 0, af);
1744                                 printf(" to ");
1745                                 pf_print_host(naddr, 0, af);
1746                                 printf("\n");
1747                         }
1748                         return (0);
1749                 }
1750         }
1751
1752         if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
1753                 return (1);
1754         if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1755                 if (af == AF_INET) {
1756                         if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
1757                             (rpool->opts & PF_POOL_TYPEMASK) !=
1758                             PF_POOL_ROUNDROBIN)
1759                                 return (1);
1760                          raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
1761                          rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
1762                 } else {
1763                         if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
1764                             (rpool->opts & PF_POOL_TYPEMASK) !=
1765                             PF_POOL_ROUNDROBIN)
1766                                 return (1);
1767                         raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
1768                         rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
1769                 }
1770         } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1771                 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
1772                         return (1); /* unsupported */
1773         } else {
1774                 raddr = &rpool->cur->addr.v.a.addr;
1775                 rmask = &rpool->cur->addr.v.a.mask;
1776         }
1777
1778         switch (rpool->opts & PF_POOL_TYPEMASK) {
1779         case PF_POOL_NONE:
1780                 PF_ACPY(naddr, raddr, af);
1781                 break;
1782         case PF_POOL_BITMASK:
1783                 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
1784                 break;
1785         case PF_POOL_RANDOM:
1786                 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
1787                         switch (af) {
1788 #ifdef INET
1789                         case AF_INET:
1790                                 rpool->counter.addr32[0] = arc4random();
1791                                 break;
1792 #endif /* INET */
1793 #ifdef INET6
1794                         case AF_INET6:
1795                                 if (rmask->addr32[3] != 0xffffffff)
1796                                         rpool->counter.addr32[3] = arc4random();
1797                                 else
1798                                         break;
1799                                 if (rmask->addr32[2] != 0xffffffff)
1800                                         rpool->counter.addr32[2] = arc4random();
1801                                 else
1802                                         break;
1803                                 if (rmask->addr32[1] != 0xffffffff)
1804                                         rpool->counter.addr32[1] = arc4random();
1805                                 else
1806                                         break;
1807                                 if (rmask->addr32[0] != 0xffffffff)
1808                                         rpool->counter.addr32[0] = arc4random();
1809                                 break;
1810 #endif /* INET6 */
1811                         }
1812                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
1813                         PF_ACPY(init_addr, naddr, af);
1814
1815                 } else {
1816                         PF_AINC(&rpool->counter, af);
1817                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
1818                 }
1819                 break;
1820         case PF_POOL_SRCHASH:
1821                 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
1822                 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
1823                 break;
1824         case PF_POOL_ROUNDROBIN:
1825                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1826                         if (!pfr_pool_get(rpool->cur->addr.p.tbl,
1827                             &rpool->tblidx, &rpool->counter,
1828                             &raddr, &rmask, af))
1829                                 goto get_addr;
1830                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1831                         if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
1832                             &rpool->tblidx, &rpool->counter,
1833                             &raddr, &rmask, af))
1834                                 goto get_addr;
1835                 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
1836                         goto get_addr;
1837
1838         try_next:
1839                 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
1840                         rpool->cur = TAILQ_FIRST(&rpool->list);
1841                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1842                         rpool->tblidx = -1;
1843                         if (pfr_pool_get(rpool->cur->addr.p.tbl,
1844                             &rpool->tblidx, &rpool->counter,
1845                             &raddr, &rmask, af)) {
1846                                 /* table contains no address of type 'af' */
1847                                 if (rpool->cur != acur)
1848                                         goto try_next;
1849                                 return (1);
1850                         }
1851                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1852                         rpool->tblidx = -1;
1853                         if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
1854                             &rpool->tblidx, &rpool->counter,
1855                             &raddr, &rmask, af)) {
1856                                 /* table contains no address of type 'af' */
1857                                 if (rpool->cur != acur)
1858                                         goto try_next;
1859                                 return (1);
1860                         }
1861                 } else {
1862                         raddr = &rpool->cur->addr.v.a.addr;
1863                         rmask = &rpool->cur->addr.v.a.mask;
1864                         PF_ACPY(&rpool->counter, raddr, af);
1865                 }
1866
1867         get_addr:
1868                 PF_ACPY(naddr, &rpool->counter, af);
1869                 PF_AINC(&rpool->counter, af);
1870                 break;
1871         }
1872         if (*sn != NULL)
1873                 PF_ACPY(&(*sn)->raddr, naddr, af);
1874
1875         if (pf_status.debug >= PF_DEBUG_MISC &&
1876             (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
1877                 printf("pf_map_addr: selected address ");
1878                 pf_print_host(naddr, 0, af);
1879                 printf("\n");
1880         }
1881
1882         return (0);
1883 }
1884
1885 int
1886 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
1887     struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
1888     struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
1889     struct pf_src_node **sn)
1890 {
1891         struct pf_state         key;
1892         struct pf_addr          init_addr;
1893         u_int16_t               cut;
1894
1895         bzero(&init_addr, sizeof(init_addr));
1896         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
1897                 return (1);
1898
1899         do {
1900                 key.af = af;
1901                 key.proto = proto;
1902                 PF_ACPY(&key.ext.addr, daddr, key.af);
1903                 PF_ACPY(&key.gwy.addr, naddr, key.af);
1904                 key.ext.port = dport;
1905
1906                 /*
1907                  * port search; start random, step;
1908                  * similar 2 portloop in in_pcbbind
1909                  */
1910                 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP)) {
1911                         key.gwy.port = 0;
1912                         if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
1913                                 return (0);
1914                 } else if (low == 0 && high == 0) {
1915                         key.gwy.port = *nport;
1916                         if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
1917                                 return (0);
1918                 } else if (low == high) {
1919                         key.gwy.port = htons(low);
1920                         if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) {
1921                                 *nport = htons(low);
1922                                 return (0);
1923                         }
1924                 } else {
1925                         u_int16_t tmp;
1926
1927                         if (low > high) {
1928                                 tmp = low;
1929                                 low = high;
1930                                 high = tmp;
1931                         }
1932                         /* low < high */
1933                         cut = arc4random() % (1 + high - low) + low;
1934                         /* low <= cut <= high */
1935                         for (tmp = cut; tmp <= high; ++(tmp)) {
1936                                 key.gwy.port = htons(tmp);
1937                                 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
1938                                     NULL) {
1939                                         *nport = htons(tmp);
1940                                         return (0);
1941                                 }
1942                         }
1943                         for (tmp = cut - 1; tmp >= low; --(tmp)) {
1944                                 key.gwy.port = htons(tmp);
1945                                 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
1946                                     NULL) {
1947                                         *nport = htons(tmp);
1948                                         return (0);
1949                                 }
1950                         }
1951                 }
1952
1953                 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
1954                 case PF_POOL_RANDOM:
1955                 case PF_POOL_ROUNDROBIN:
1956                         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
1957                                 return (1);
1958                         break;
1959                 case PF_POOL_NONE:
1960                 case PF_POOL_SRCHASH:
1961                 case PF_POOL_BITMASK:
1962                 default:
1963                         return (1);
1964                 }
1965         } while (! PF_AEQ(&init_addr, naddr, af) );
1966
1967         return (1);                                     /* none available */
1968 }
1969
1970 struct pf_rule *
1971 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
1972     int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
1973     struct pf_addr *daddr, u_int16_t dport, int rs_num)
1974 {
1975         struct pf_rule          *r, *rm = NULL, *anchorrule = NULL;
1976         struct pf_ruleset       *ruleset = NULL;
1977
1978         r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
1979         while (r && rm == NULL) {
1980                 struct pf_rule_addr     *src = NULL, *dst = NULL;
1981                 struct pf_addr_wrap     *xdst = NULL;
1982
1983                 if (r->action == PF_BINAT && direction == PF_IN) {
1984                         src = &r->dst;
1985                         if (r->rpool.cur != NULL)
1986                                 xdst = &r->rpool.cur->addr;
1987                 } else {
1988                         src = &r->src;
1989                         dst = &r->dst;
1990                 }
1991
1992                 r->evaluations++;
1993                 if (r->kif != NULL &&
1994                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
1995                         r = r->skip[PF_SKIP_IFP].ptr;
1996                 else if (r->direction && r->direction != direction)
1997                         r = r->skip[PF_SKIP_DIR].ptr;
1998                 else if (r->af && r->af != pd->af)
1999                         r = r->skip[PF_SKIP_AF].ptr;
2000                 else if (r->proto && r->proto != pd->proto)
2001                         r = r->skip[PF_SKIP_PROTO].ptr;
2002                 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->not))
2003                         r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
2004                             PF_SKIP_DST_ADDR].ptr;
2005                 else if (src->port_op && !pf_match_port(src->port_op,
2006                     src->port[0], src->port[1], sport))
2007                         r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
2008                             PF_SKIP_DST_PORT].ptr;
2009                 else if (dst != NULL &&
2010                     PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->not))
2011                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2012                 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0))
2013                         r = TAILQ_NEXT(r, entries);
2014                 else if (dst != NULL && dst->port_op &&
2015                     !pf_match_port(dst->port_op, dst->port[0],
2016                     dst->port[1], dport))
2017                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2018                 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2019                     IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2020                     off, pd->hdr.tcp), r->os_fingerprint)))
2021                         r = TAILQ_NEXT(r, entries);
2022                 else if (r->anchorname[0] && r->anchor == NULL)
2023                         r = TAILQ_NEXT(r, entries);
2024                 else if (r->anchor == NULL)
2025                                 rm = r;
2026                 else
2027                         PF_STEP_INTO_ANCHOR(r, anchorrule, ruleset, rs_num);
2028                 if (r == NULL && anchorrule != NULL)
2029                         PF_STEP_OUT_OF_ANCHOR(r, anchorrule, ruleset,
2030                             rs_num);
2031         }
2032         if (rm != NULL && (rm->action == PF_NONAT ||
2033             rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2034                 return (NULL);
2035         return (rm);
2036 }
2037
2038 struct pf_rule *
2039 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2040     struct pfi_kif *kif, struct pf_src_node **sn,
2041     struct pf_addr *saddr, u_int16_t sport,
2042     struct pf_addr *daddr, u_int16_t dport,
2043     struct pf_addr *naddr, u_int16_t *nport)
2044 {
2045         struct pf_rule  *r = NULL;
2046
2047         if (direction == PF_OUT) {
2048                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2049                     sport, daddr, dport, PF_RULESET_BINAT);
2050                 if (r == NULL)
2051                         r = pf_match_translation(pd, m, off, direction, kif,
2052                             saddr, sport, daddr, dport, PF_RULESET_NAT);
2053         } else {
2054                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2055                     sport, daddr, dport, PF_RULESET_RDR);
2056                 if (r == NULL)
2057                         r = pf_match_translation(pd, m, off, direction, kif,
2058                             saddr, sport, daddr, dport, PF_RULESET_BINAT);
2059         }
2060
2061         if (r != NULL) {
2062                 switch (r->action) {
2063                 case PF_NONAT:
2064                 case PF_NOBINAT:
2065                 case PF_NORDR:
2066                         return (NULL);
2067                 case PF_NAT:
2068                         if (pf_get_sport(pd->af, pd->proto, r, saddr,
2069                             daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2070                             r->rpool.proxy_port[1], sn)) {
2071                                 DPFPRINTF(PF_DEBUG_MISC,
2072                                     ("pf: NAT proxy port allocation "
2073                                     "(%u-%u) failed\n",
2074                                     r->rpool.proxy_port[0],
2075                                     r->rpool.proxy_port[1]));
2076                                 return (NULL);
2077                         }
2078                         break;
2079                 case PF_BINAT:
2080                         switch (direction) {
2081                         case PF_OUT:
2082                                 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
2083                                         if (pd->af == AF_INET) {
2084                                                 if (r->rpool.cur->addr.p.dyn->
2085                                                     pfid_acnt4 < 1)
2086                                                         return (NULL);
2087                                                 PF_POOLMASK(naddr,
2088                                                     &r->rpool.cur->addr.p.dyn->
2089                                                     pfid_addr4,
2090                                                     &r->rpool.cur->addr.p.dyn->
2091                                                     pfid_mask4,
2092                                                     saddr, AF_INET);
2093                                         } else {
2094                                                 if (r->rpool.cur->addr.p.dyn->
2095                                                     pfid_acnt6 < 1)
2096                                                         return (NULL);
2097                                                 PF_POOLMASK(naddr,
2098                                                     &r->rpool.cur->addr.p.dyn->
2099                                                     pfid_addr6,
2100                                                     &r->rpool.cur->addr.p.dyn->
2101                                                     pfid_mask6,
2102                                                     saddr, AF_INET6);
2103                                         }
2104                                 } else
2105                                         PF_POOLMASK(naddr,
2106                                             &r->rpool.cur->addr.v.a.addr,
2107                                             &r->rpool.cur->addr.v.a.mask,
2108                                             saddr, pd->af);
2109                                 break;
2110                         case PF_IN:
2111                                 if (r->src.addr.type == PF_ADDR_DYNIFTL){
2112                                         if (pd->af == AF_INET) {
2113                                                 if (r->src.addr.p.dyn->
2114                                                     pfid_acnt4 < 1)
2115                                                         return (NULL);
2116                                                 PF_POOLMASK(naddr,
2117                                                     &r->src.addr.p.dyn->
2118                                                     pfid_addr4,
2119                                                     &r->src.addr.p.dyn->
2120                                                     pfid_mask4,
2121                                                     daddr, AF_INET);
2122                                         } else {
2123                                                 if (r->src.addr.p.dyn->
2124                                                     pfid_acnt6 < 1)
2125                                                         return (NULL);
2126                                                 PF_POOLMASK(naddr,
2127                                                     &r->src.addr.p.dyn->
2128                                                     pfid_addr6,
2129                                                     &r->src.addr.p.dyn->
2130                                                     pfid_mask6,
2131                                                     daddr, AF_INET6);
2132                                         }
2133                                 } else
2134                                         PF_POOLMASK(naddr,
2135                                             &r->src.addr.v.a.addr,
2136                                             &r->src.addr.v.a.mask, daddr,
2137                                             pd->af);
2138                                 break;
2139                         }
2140                         break;
2141                 case PF_RDR: {
2142                         if (pf_map_addr(r->af, r, saddr, naddr, NULL, sn))
2143                                 return (NULL);
2144
2145                         if (r->rpool.proxy_port[1]) {
2146                                 u_int32_t       tmp_nport;
2147
2148                                 tmp_nport = ((ntohs(dport) -
2149                                     ntohs(r->dst.port[0])) %
2150                                     (r->rpool.proxy_port[1] -
2151                                     r->rpool.proxy_port[0] + 1)) +
2152                                     r->rpool.proxy_port[0];
2153
2154                                 /* wrap around if necessary */
2155                                 if (tmp_nport > 65535)
2156                                         tmp_nport -= 65535;
2157                                 *nport = htons((u_int16_t)tmp_nport);
2158                         } else if (r->rpool.proxy_port[0])
2159                                 *nport = htons(r->rpool.proxy_port[0]);
2160                         break;
2161                 }
2162                 default:
2163                         return (NULL);
2164                 }
2165         }
2166
2167         return (r);
2168 }
2169
2170 #ifdef SMP
2171 struct netmsg_hashlookup {
2172         struct lwkt_msg         nm_lmsg;
2173         struct inpcb            **nm_pinp;
2174         struct inpcbinfo        *nm_pcbinfo;
2175         struct pf_addr          *nm_saddr;
2176         struct pf_addr          *nm_daddr;
2177         uint16_t                nm_sport;
2178         uint16_t                nm_dport;
2179         sa_family_t             nm_af;
2180 };
2181
2182 static int
2183 in_pcblookup_hash_handler(struct lwkt_msg *msg0)
2184 {
2185         struct netmsg_hashlookup *msg = (struct netmsg_hashlookup *)msg0;
2186
2187         if (msg->nm_af == AF_INET)
2188                 *msg->nm_pinp = in_pcblookup_hash(msg->nm_pcbinfo,
2189                     msg->nm_saddr->v4, msg->nm_sport, msg->nm_daddr->v4,
2190                     msg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2191 #ifdef INET6
2192         else
2193                 *msg->nm_pinp = in6_pcblookup_hash(msg->nm_pcbinfo,
2194                     &msg->nm_saddr->v6, msg->nm_sport, &msg->nm_daddr->v6,
2195                     msg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2196 #endif /* INET6 */
2197         lwkt_replymsg(&msg->nm_lmsg, 0);
2198         return (EASYNC);
2199 }
2200 #endif /* SMP */
2201
2202 int
2203 pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd)
2204 {
2205         struct pf_addr          *saddr, *daddr;
2206         u_int16_t                sport, dport;
2207         struct inpcbinfo        *pi;
2208         struct inpcb            *inp;
2209 #ifdef SMP
2210         struct netmsg_hashlookup *msg = NULL;
2211 #endif
2212         int                      pi_cpu = 0;
2213
2214         *uid = UID_MAX;
2215         *gid = GID_MAX;
2216         if (direction == PF_IN) {
2217                 saddr = pd->src;
2218                 daddr = pd->dst;
2219         } else {
2220                 saddr = pd->dst;
2221                 daddr = pd->src;
2222         }
2223         switch (pd->proto) {
2224         case IPPROTO_TCP:
2225                 sport = pd->hdr.tcp->th_sport;
2226                 dport = pd->hdr.tcp->th_dport;
2227
2228                 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2229                 pi = &tcbinfo[pi_cpu];
2230 #ifdef SMP
2231                 /*
2232                  * Our netstack runs lockless on MP systems
2233                  * (only for TCP connections at the moment).
2234                  *
2235                  * As we are not allowed to read another CPU's tcbinfo,
2236                  * we have to ask that CPU via remote call to search the
2237                  * table for us.
2238                  *
2239                  * Prepare a msg iff data belongs to another CPU.
2240                  */
2241                 if (pi_cpu != mycpu->gd_cpuid) {
2242                         msg = malloc(sizeof(*msg), M_LWKTMSG, M_INTWAIT);
2243                         lwkt_initmsg(&msg->nm_lmsg, &netisr_afree_rport, 0,
2244                             lwkt_cmd_func(in_pcblookup_hash_handler),
2245                             lwkt_cmd_op_none);
2246                         msg->nm_pinp = &inp;
2247                         msg->nm_pcbinfo = pi;
2248                         msg->nm_saddr = saddr;
2249                         msg->nm_sport = sport;
2250                         msg->nm_daddr = daddr;
2251                         msg->nm_dport = dport;
2252                         msg->nm_af = pd->af;
2253                 }
2254 #endif /* SMP */
2255                 break;
2256         case IPPROTO_UDP:
2257                 sport = pd->hdr.udp->uh_sport;
2258                 dport = pd->hdr.udp->uh_dport;
2259                 pi = &udbinfo;
2260                 break;
2261         default:
2262                 return (0);
2263         }
2264         if (direction != PF_IN) {
2265                 u_int16_t       p;
2266
2267                 p = sport;
2268                 sport = dport;
2269                 dport = p;
2270         }
2271         switch (pd->af) {
2272 #ifdef INET6
2273         case AF_INET6:
2274 #ifdef SMP
2275                 /*
2276                  * Query other CPU, second part
2277                  *
2278                  * msg only gets initialized when:
2279                  * 1) packet is TCP
2280                  * 2) the info belongs to another CPU
2281                  *
2282                  * Use some switch/case magic to avoid code duplication.
2283                  */
2284                 if (msg == NULL)
2285 #endif /* SMP */
2286                 {
2287                         inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
2288                             &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
2289
2290                         if (inp == NULL)
2291                                 return (0);
2292                         break;
2293                 }
2294                 /* FALLTHROUGH if SMP and on other CPU */
2295 #endif /* INET6 */
2296         case AF_INET:
2297 #ifdef SMP
2298                 if (msg != NULL) {
2299                         lwkt_sendmsg(tcp_cport(pi_cpu), &msg->nm_lmsg);
2300                 } else
2301 #endif /* SMP */
2302                 {
2303                         inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2304                             dport, INPLOOKUP_WILDCARD, NULL);
2305                 }
2306                 if (inp == NULL)
2307                         return (0);
2308                 break;
2309
2310         default:
2311                 return (0);
2312         }
2313         *uid = inp->inp_socket->so_cred->cr_uid;
2314         *gid = inp->inp_socket->so_cred->cr_groups[0];
2315         return (1);
2316 }
2317
2318 u_int8_t
2319 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2320 {
2321         int              hlen;
2322         u_int8_t         hdr[60];
2323         u_int8_t        *opt, optlen;
2324         u_int8_t         wscale = 0;
2325
2326         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
2327         if (hlen <= sizeof(struct tcphdr))
2328                 return (0);
2329         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2330                 return (0);
2331         opt = hdr + sizeof(struct tcphdr);
2332         hlen -= sizeof(struct tcphdr);
2333         while (hlen >= 3) {
2334                 switch (*opt) {
2335                 case TCPOPT_EOL:
2336                 case TCPOPT_NOP:
2337                         ++opt;
2338                         --hlen;
2339                         break;
2340                 case TCPOPT_WINDOW:
2341                         wscale = opt[2];
2342                         if (wscale > TCP_MAX_WINSHIFT)
2343                                 wscale = TCP_MAX_WINSHIFT;
2344                         wscale |= PF_WSCALE_FLAG;
2345                         /* FALLTHROUGH */
2346                 default:
2347                         optlen = opt[1];
2348                         if (optlen < 2)
2349                                 optlen = 2;
2350                         hlen -= optlen;
2351                         opt += optlen;
2352                         break;
2353                 }
2354         }
2355         return (wscale);
2356 }
2357
2358 u_int16_t
2359 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2360 {
2361         int              hlen;
2362         u_int8_t         hdr[60];
2363         u_int8_t        *opt, optlen;
2364         u_int16_t        mss = tcp_mssdflt;
2365
2366         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
2367         if (hlen <= sizeof(struct tcphdr))
2368                 return (0);
2369         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2370                 return (0);
2371         opt = hdr + sizeof(struct tcphdr);
2372         hlen -= sizeof(struct tcphdr);
2373         while (hlen >= TCPOLEN_MAXSEG) {
2374                 switch (*opt) {
2375                 case TCPOPT_EOL:
2376                 case TCPOPT_NOP:
2377                         ++opt;
2378                         --hlen;
2379                         break;
2380                 case TCPOPT_MAXSEG:
2381                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
2382                         /* FALLTHROUGH */
2383                 default:
2384                         optlen = opt[1];
2385                         if (optlen < 2)
2386                                 optlen = 2;
2387                         hlen -= optlen;
2388                         opt += optlen;
2389                         break;
2390                 }
2391         }
2392         return (mss);
2393 }
2394
2395 u_int16_t
2396 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
2397 {
2398 #ifdef INET
2399         struct sockaddr_in      *dst;
2400         struct route             ro;
2401 #endif /* INET */
2402 #ifdef INET6
2403         struct sockaddr_in6     *dst6;
2404         struct route_in6         ro6;
2405 #endif /* INET6 */
2406         struct rtentry          *rt = NULL;
2407         int                      hlen = 0;
2408         u_int16_t                mss = tcp_mssdflt;
2409
2410         switch (af) {
2411 #ifdef INET
2412         case AF_INET:
2413                 hlen = sizeof(struct ip);
2414                 bzero(&ro, sizeof(ro));
2415                 dst = (struct sockaddr_in *)&ro.ro_dst;
2416                 dst->sin_family = AF_INET;
2417                 dst->sin_len = sizeof(*dst);
2418                 dst->sin_addr = addr->v4;
2419                 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
2420                 rt = ro.ro_rt;
2421                 break;
2422 #endif /* INET */
2423 #ifdef INET6
2424         case AF_INET6:
2425                 hlen = sizeof(struct ip6_hdr);
2426                 bzero(&ro6, sizeof(ro6));
2427                 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
2428                 dst6->sin6_family = AF_INET6;
2429                 dst6->sin6_len = sizeof(*dst6);
2430                 dst6->sin6_addr = addr->v6;
2431                 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
2432                 rt = ro6.ro_rt;
2433                 break;
2434 #endif /* INET6 */
2435         }
2436
2437         if (rt && rt->rt_ifp) {
2438                 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
2439                 mss = max(tcp_mssdflt, mss);
2440                 RTFREE(rt);
2441         }
2442         mss = min(mss, offer);
2443         mss = max(mss, 64);             /* sanity - at least max opt space */
2444         return (mss);
2445 }
2446
2447 void
2448 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
2449 {
2450         struct pf_rule *r = s->rule.ptr;
2451
2452         s->rt_kif = NULL;
2453         if (!r->rt || r->rt == PF_FASTROUTE)
2454                 return;
2455         switch (s->af) {
2456 #ifdef INET
2457         case AF_INET:
2458                 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
2459                     &s->nat_src_node);
2460                 s->rt_kif = r->rpool.cur->kif;
2461                 break;
2462 #endif /* INET */
2463 #ifdef INET6
2464         case AF_INET6:
2465                 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
2466                     &s->nat_src_node);
2467                 s->rt_kif = r->rpool.cur->kif;
2468                 break;
2469 #endif /* INET6 */
2470         }
2471 }
2472
2473 int
2474 pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction,
2475     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2476     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
2477 {
2478         struct pf_rule          *nr = NULL;
2479         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
2480         struct tcphdr           *th = pd->hdr.tcp;
2481         u_int16_t                bport, nport = 0;
2482         sa_family_t              af = pd->af;
2483         int                      lookup = -1;
2484         uid_t                    uid;
2485         gid_t                    gid;
2486         struct pf_rule          *r, *a = NULL;
2487         struct pf_ruleset       *ruleset = NULL;
2488         struct pf_src_node      *nsn = NULL;
2489         u_short                  reason;
2490         int                      rewrite = 0;
2491         int                      tag = -1;
2492         u_int16_t                mss = tcp_mssdflt;
2493
2494         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2495
2496         if (direction == PF_OUT) {
2497                 bport = nport = th->th_sport;
2498                 /* check outgoing packet for BINAT/NAT */
2499                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2500                     saddr, th->th_sport, daddr, th->th_dport,
2501                     &pd->naddr, &nport)) != NULL) {
2502                         PF_ACPY(&pd->baddr, saddr, af);
2503                         pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
2504                             &th->th_sum, &pd->naddr, nport, 0, af);
2505                         rewrite++;
2506                         if (nr->natpass)
2507                                 r = NULL;
2508                         pd->nat_rule = nr;
2509                 }
2510         } else {
2511                 bport = nport = th->th_dport;
2512                 /* check incoming packet for BINAT/RDR */
2513                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
2514                     saddr, th->th_sport, daddr, th->th_dport,
2515                     &pd->naddr, &nport)) != NULL) {
2516                         PF_ACPY(&pd->baddr, daddr, af);
2517                         pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
2518                             &th->th_sum, &pd->naddr, nport, 0, af);
2519                         rewrite++;
2520                         if (nr->natpass)
2521                                 r = NULL;
2522                         pd->nat_rule = nr;
2523                 }
2524         }
2525
2526         while (r != NULL) {
2527                 r->evaluations++;
2528                 if (r->kif != NULL &&
2529                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
2530                         r = r->skip[PF_SKIP_IFP].ptr;
2531                 else if (r->direction && r->direction != direction)
2532                         r = r->skip[PF_SKIP_DIR].ptr;
2533                 else if (r->af && r->af != af)
2534                         r = r->skip[PF_SKIP_AF].ptr;
2535                 else if (r->proto && r->proto != IPPROTO_TCP)
2536                         r = r->skip[PF_SKIP_PROTO].ptr;
2537                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
2538                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
2539                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
2540                     r->src.port[0], r->src.port[1], th->th_sport))
2541                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
2542                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
2543                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2544                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
2545                     r->dst.port[0], r->dst.port[1], th->th_dport))
2546                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2547                 else if (r->tos && !(r->tos & pd->tos))
2548                         r = TAILQ_NEXT(r, entries);
2549                 else if (r->rule_flag & PFRULE_FRAGMENT)
2550                         r = TAILQ_NEXT(r, entries);
2551                 else if ((r->flagset & th->th_flags) != r->flags)
2552                         r = TAILQ_NEXT(r, entries);
2553                 else if (r->uid.op && (lookup != -1 || (lookup =
2554                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2555                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
2556                     uid))
2557                         r = TAILQ_NEXT(r, entries);
2558                 else if (r->gid.op && (lookup != -1 || (lookup =
2559                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2560                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
2561                     gid))
2562                         r = TAILQ_NEXT(r, entries);
2563                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
2564                         r = TAILQ_NEXT(r, entries);
2565                 else if (r->anchorname[0] && r->anchor == NULL)
2566                         r = TAILQ_NEXT(r, entries);
2567                 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match(
2568                     pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint))
2569                         r = TAILQ_NEXT(r, entries);
2570                 else {
2571                         if (r->tag)
2572                                 tag = r->tag;
2573                         if (r->anchor == NULL) {
2574                                 *rm = r;
2575                                 *am = a;
2576                                 *rsm = ruleset;
2577                                 if ((*rm)->quick)
2578                                         break;
2579                                 r = TAILQ_NEXT(r, entries);
2580                         } else
2581                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
2582                                     PF_RULESET_FILTER);
2583                 }
2584                 if (r == NULL && a != NULL)
2585                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
2586                             PF_RULESET_FILTER);
2587         }
2588         r = *rm;
2589         a = *am;
2590         ruleset = *rsm;
2591
2592         REASON_SET(&reason, PFRES_MATCH);
2593
2594         if (r->log) {
2595                 if (rewrite)
2596                         m_copyback(m, off, sizeof(*th), (caddr_t)th);
2597                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
2598         }
2599
2600         if ((r->action == PF_DROP) &&
2601             ((r->rule_flag & PFRULE_RETURNRST) ||
2602             (r->rule_flag & PFRULE_RETURNICMP) ||
2603             (r->rule_flag & PFRULE_RETURN))) {
2604                 /* undo NAT changes, if they have taken place */
2605                 if (nr != NULL) {
2606                         if (direction == PF_OUT) {
2607                                 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
2608                                     &th->th_sum, &pd->baddr, bport, 0, af);
2609                                 rewrite++;
2610                         } else {
2611                                 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
2612                                     &th->th_sum, &pd->baddr, bport, 0, af);
2613                                 rewrite++;
2614                         }
2615                 }
2616                 if (((r->rule_flag & PFRULE_RETURNRST) ||
2617                     (r->rule_flag & PFRULE_RETURN)) &&
2618                     !(th->th_flags & TH_RST)) {
2619                         u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
2620
2621                         if (th->th_flags & TH_SYN)
2622                                 ack++;
2623                         if (th->th_flags & TH_FIN)
2624                                 ack++;
2625                         pf_send_tcp(r, af, pd->dst,
2626                             pd->src, th->th_dport, th->th_sport,
2627                             ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
2628                             r->return_ttl);
2629                 } else if ((af == AF_INET) && r->return_icmp)
2630                         pf_send_icmp(m, r->return_icmp >> 8,
2631                             r->return_icmp & 255, af, r);
2632                 else if ((af == AF_INET6) && r->return_icmp6)
2633                         pf_send_icmp(m, r->return_icmp6 >> 8,
2634                             r->return_icmp6 & 255, af, r);
2635         }
2636
2637         if (r->action == PF_DROP)
2638                 return (PF_DROP);
2639
2640         pf_tag_packet(m, tag);
2641
2642         if (r->keep_state || nr != NULL ||
2643             (pd->flags & PFDESC_TCP_NORM)) {
2644                 /* create new state */
2645                 u_int16_t        len;
2646                 struct pf_state *s = NULL;
2647                 struct pf_src_node *sn = NULL;
2648
2649                 len = pd->tot_len - off - (th->th_off << 2);
2650
2651                 /* check maximums */
2652                 if (r->max_states && (r->states >= r->max_states))
2653                         goto cleanup;
2654                 /* src node for flter rule */
2655                 if ((r->rule_flag & PFRULE_SRCTRACK ||
2656                     r->rpool.opts & PF_POOL_STICKYADDR) &&
2657                     pf_insert_src_node(&sn, r, saddr, af) != 0)
2658                         goto cleanup;
2659                 /* src node for translation rule */
2660                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
2661                     ((direction == PF_OUT &&
2662                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
2663                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
2664                         goto cleanup;
2665                 s = pool_get(&pf_state_pl, PR_NOWAIT);
2666                 if (s == NULL) {
2667 cleanup:
2668                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
2669                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
2670                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2671                                 pf_status.src_nodes--;
2672                                 pool_put(&pf_src_tree_pl, sn);
2673                         }
2674                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
2675                             nsn->expire == 0) {
2676                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
2677                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2678                                 pf_status.src_nodes--;
2679                                 pool_put(&pf_src_tree_pl, nsn);
2680                         }
2681                         REASON_SET(&reason, PFRES_MEMORY);
2682                         return (PF_DROP);
2683                 }
2684                 bzero(s, sizeof(*s));
2685                 r->states++;
2686                 if (a != NULL)
2687                         a->states++;
2688                 s->rule.ptr = r;
2689                 s->nat_rule.ptr = nr;
2690                 if (s->nat_rule.ptr != NULL)
2691                         s->nat_rule.ptr->states++;
2692                 s->anchor.ptr = a;
2693                 s->allow_opts = r->allow_opts;
2694                 s->log = r->log & 2;
2695                 s->proto = IPPROTO_TCP;
2696                 s->direction = direction;
2697                 s->af = af;
2698                 if (direction == PF_OUT) {
2699                         PF_ACPY(&s->gwy.addr, saddr, af);
2700                         s->gwy.port = th->th_sport;             /* sport */
2701                         PF_ACPY(&s->ext.addr, daddr, af);
2702                         s->ext.port = th->th_dport;
2703                         if (nr != NULL) {
2704                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
2705                                 s->lan.port = bport;
2706                         } else {
2707                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
2708                                 s->lan.port = s->gwy.port;
2709                         }
2710                 } else {
2711                         PF_ACPY(&s->lan.addr, daddr, af);
2712                         s->lan.port = th->th_dport;
2713                         PF_ACPY(&s->ext.addr, saddr, af);
2714                         s->ext.port = th->th_sport;
2715                         if (nr != NULL) {
2716                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
2717                                 s->gwy.port = bport;
2718                         } else {
2719                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
2720                                 s->gwy.port = s->lan.port;
2721                         }
2722                 }
2723
2724                 s->src.seqlo = ntohl(th->th_seq);
2725                 s->src.seqhi = s->src.seqlo + len + 1;
2726                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2727                     r->keep_state == PF_STATE_MODULATE) {
2728                         /* Generate sequence number modulator */
2729                         while ((s->src.seqdiff = arc4random()) == 0)
2730                                 ;
2731                         pf_change_a(&th->th_seq, &th->th_sum,
2732                             htonl(s->src.seqlo + s->src.seqdiff), 0);
2733                         rewrite = 1;
2734                 } else
2735                         s->src.seqdiff = 0;
2736                 if (th->th_flags & TH_SYN) {
2737                         s->src.seqhi++;
2738                         s->src.wscale = pf_get_wscale(m, off, th->th_off, af);
2739                 }
2740                 s->src.max_win = MAX(ntohs(th->th_win), 1);
2741                 if (s->src.wscale & PF_WSCALE_MASK) {
2742                         /* Remove scale factor from initial window */
2743                         int win = s->src.max_win;
2744                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
2745                         s->src.max_win = (win - 1) >>
2746                             (s->src.wscale & PF_WSCALE_MASK);
2747                 }
2748                 if (th->th_flags & TH_FIN)
2749                         s->src.seqhi++;
2750                 s->dst.seqhi = 1;
2751                 s->dst.max_win = 1;
2752                 s->src.state = TCPS_SYN_SENT;
2753                 s->dst.state = TCPS_CLOSED;
2754                 s->creation = time_second;
2755                 s->expire = time_second;
2756                 s->timeout = PFTM_TCP_FIRST_PACKET;
2757                 pf_set_rt_ifp(s, saddr);
2758                 if (sn != NULL) {
2759                         s->src_node = sn;
2760                         s->src_node->states++;
2761                 }
2762                 if (nsn != NULL) {
2763                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
2764                         s->nat_src_node = nsn;
2765                         s->nat_src_node->states++;
2766                 }
2767                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
2768                     off, pd, th, &s->src, &s->dst)) {
2769                         REASON_SET(&reason, PFRES_MEMORY);
2770                         pf_src_tree_remove_state(s);
2771                         pool_put(&pf_state_pl, s);
2772                         return (PF_DROP);
2773                 }
2774                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
2775                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, &s->src,
2776                     &s->dst, &rewrite)) {
2777                         pf_normalize_tcp_cleanup(s);
2778                         pf_src_tree_remove_state(s);
2779                         pool_put(&pf_state_pl, s);
2780                         return (PF_DROP);
2781                 }
2782                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
2783                         pf_normalize_tcp_cleanup(s);
2784                         REASON_SET(&reason, PFRES_MEMORY);
2785                         pf_src_tree_remove_state(s);
2786                         pool_put(&pf_state_pl, s);
2787                         return (PF_DROP);
2788                 } else
2789                         *sm = s;
2790                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2791                     r->keep_state == PF_STATE_SYNPROXY) {
2792                         s->src.state = PF_TCPS_PROXY_SRC;
2793                         if (nr != NULL) {
2794                                 if (direction == PF_OUT) {
2795                                         pf_change_ap(saddr, &th->th_sport,
2796                                             pd->ip_sum, &th->th_sum, &pd->baddr,
2797                                             bport, 0, af);
2798                                 } else {
2799                                         pf_change_ap(daddr, &th->th_dport,
2800                                             pd->ip_sum, &th->th_sum, &pd->baddr,
2801                                             bport, 0, af);
2802                                 }
2803                         }
2804                         s->src.seqhi = arc4random();
2805                         /* Find mss option */
2806                         mss = pf_get_mss(m, off, th->th_off, af);
2807                         mss = pf_calc_mss(saddr, af, mss);
2808                         mss = pf_calc_mss(daddr, af, mss);
2809                         s->src.mss = mss;
2810                         pf_send_tcp(r, af, daddr, saddr, th->th_dport,
2811                             th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
2812                             TH_SYN|TH_ACK, 0, s->src.mss, 0);
2813                         return (PF_SYNPROXY_DROP);
2814                 }
2815         }
2816
2817         /* copy back packet headers if we performed NAT operations */
2818         if (rewrite)
2819                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
2820
2821         return (PF_PASS);
2822 }
2823
2824 int
2825 pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction,
2826     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2827     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
2828 {
2829         struct pf_rule          *nr = NULL;
2830         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
2831         struct udphdr           *uh = pd->hdr.udp;
2832         u_int16_t                bport, nport = 0;
2833         sa_family_t              af = pd->af;
2834         int                      lookup = -1;
2835         uid_t                    uid;
2836         gid_t                    gid;
2837         struct pf_rule          *r, *a = NULL;
2838         struct pf_ruleset       *ruleset = NULL;
2839         struct pf_src_node      *nsn = NULL;
2840         u_short                  reason;
2841         int                      rewrite = 0;
2842         int                      tag = -1;
2843
2844         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2845
2846         if (direction == PF_OUT) {
2847                 bport = nport = uh->uh_sport;
2848                 /* check outgoing packet for BINAT/NAT */
2849                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2850                     saddr, uh->uh_sport, daddr, uh->uh_dport,
2851                     &pd->naddr, &nport)) != NULL) {
2852                         PF_ACPY(&pd->baddr, saddr, af);
2853                         pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2854                             &uh->uh_sum, &pd->naddr, nport, 1, af);
2855                         rewrite++;
2856                         if (nr->natpass)
2857                                 r = NULL;
2858                         pd->nat_rule = nr;
2859                 }
2860         } else {
2861                 bport = nport = uh->uh_dport;
2862                 /* check incoming packet for BINAT/RDR */
2863                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
2864                     saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr,
2865                     &nport)) != NULL) {
2866                         PF_ACPY(&pd->baddr, daddr, af);
2867                         pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2868                             &uh->uh_sum, &pd->naddr, nport, 1, af);
2869                         rewrite++;
2870                         if (nr->natpass)
2871                                 r = NULL;
2872                         pd->nat_rule = nr;
2873                 }
2874         }
2875
2876         while (r != NULL) {
2877                 r->evaluations++;
2878                 if (r->kif != NULL &&
2879                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
2880                         r = r->skip[PF_SKIP_IFP].ptr;
2881                 else if (r->direction && r->direction != direction)
2882                         r = r->skip[PF_SKIP_DIR].ptr;
2883                 else if (r->af && r->af != af)
2884                         r = r->skip[PF_SKIP_AF].ptr;
2885                 else if (r->proto && r->proto != IPPROTO_UDP)
2886                         r = r->skip[PF_SKIP_PROTO].ptr;
2887                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
2888                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
2889                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
2890                     r->src.port[0], r->src.port[1], uh->uh_sport))
2891                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
2892                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
2893                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2894                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
2895                     r->dst.port[0], r->dst.port[1], uh->uh_dport))
2896                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2897                 else if (r->tos && !(r->tos & pd->tos))
2898                         r = TAILQ_NEXT(r, entries);
2899                 else if (r->rule_flag & PFRULE_FRAGMENT)
2900                         r = TAILQ_NEXT(r, entries);
2901                 else if (r->uid.op && (lookup != -1 || (lookup =
2902                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2903                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
2904                     uid))
2905                         r = TAILQ_NEXT(r, entries);
2906                 else if (r->gid.op && (lookup != -1 || (lookup =
2907                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2908                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
2909                     gid))
2910                         r = TAILQ_NEXT(r, entries);
2911                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
2912                         r = TAILQ_NEXT(r, entries);
2913                 else if (r->anchorname[0] && r->anchor == NULL)
2914                         r = TAILQ_NEXT(r, entries);
2915                 else if (r->os_fingerprint != PF_OSFP_ANY)
2916                         r = TAILQ_NEXT(r, entries);
2917                 else {
2918                         if (r->tag)
2919                                 tag = r->tag;
2920                         if (r->anchor == NULL) {
2921                                 *rm = r;
2922                                 *am = a;
2923                                 *rsm = ruleset;
2924                                 if ((*rm)->quick)
2925                                         break;
2926                                 r = TAILQ_NEXT(r, entries);
2927                         } else
2928                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
2929                                     PF_RULESET_FILTER);
2930                 }
2931                 if (r == NULL && a != NULL)
2932                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
2933                             PF_RULESET_FILTER);
2934         }
2935         r = *rm;
2936         a = *am;
2937         ruleset = *rsm;
2938
2939         REASON_SET(&reason, PFRES_MATCH);
2940
2941         if (r->log) {
2942                 if (rewrite)
2943                         m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
2944                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
2945         }
2946
2947         if ((r->action == PF_DROP) &&
2948             ((r->rule_flag & PFRULE_RETURNICMP) ||
2949             (r->rule_flag & PFRULE_RETURN))) {
2950                 /* undo NAT changes, if they have taken place */
2951                 if (nr != NULL) {
2952                         if (direction == PF_OUT) {
2953                                 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2954                                     &uh->uh_sum, &pd->baddr, bport, 1, af);
2955                                 rewrite++;
2956                         } else {
2957                                 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2958                                     &uh->uh_sum, &pd->baddr, bport, 1, af);
2959                                 rewrite++;
2960                         }
2961                 }
2962                 if ((af == AF_INET) && r->return_icmp)
2963                         pf_send_icmp(m, r->return_icmp >> 8,
2964                             r->return_icmp & 255, af, r);
2965                 else if ((af == AF_INET6) && r->return_icmp6)
2966                         pf_send_icmp(m, r->return_icmp6 >> 8,
2967                             r->return_icmp6 & 255, af, r);
2968         }
2969
2970         if (r->action == PF_DROP)
2971                 return (PF_DROP);
2972
2973         pf_tag_packet(m, tag);
2974
2975         if (r->keep_state || nr != NULL) {
2976                 /* create new state */
2977                 struct pf_state *s = NULL;
2978                 struct pf_src_node *sn = NULL;
2979
2980                 /* check maximums */
2981                 if (r->max_states && (r->states >= r->max_states))
2982                         goto cleanup;
2983                 /* src node for flter rule */
2984                 if ((r->rule_flag & PFRULE_SRCTRACK ||
2985                     r->rpool.opts & PF_POOL_STICKYADDR) &&
2986                     pf_insert_src_node(&sn, r, saddr, af) != 0)
2987                         goto cleanup;
2988                 /* src node for translation rule */
2989                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
2990                     ((direction == PF_OUT &&
2991                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
2992                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
2993                         goto cleanup;
2994                 s = pool_get(&pf_state_pl, PR_NOWAIT);
2995                 if (s == NULL) {
2996 cleanup:
2997                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
2998                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
2999                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3000                                 pf_status.src_nodes--;
3001                                 pool_put(&pf_src_tree_pl, sn);
3002                         }
3003                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3004                             nsn->expire == 0) {
3005                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3006                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3007                                 pf_status.src_nodes--;
3008                                 pool_put(&pf_src_tree_pl, nsn);
3009                         }
3010                         REASON_SET(&reason, PFRES_MEMORY);
3011                         return (PF_DROP);
3012                 }
3013                 bzero(s, sizeof(*s));
3014                 r->states++;
3015                 if (a != NULL)
3016                         a->states++;
3017                 s->rule.ptr = r;
3018                 s->nat_rule.ptr = nr;
3019                 if (s->nat_rule.ptr != NULL)
3020                         s->nat_rule.ptr->states++;
3021                 s->anchor.ptr = a;
3022                 s->allow_opts = r->allow_opts;
3023                 s->log = r->log & 2;
3024                 s->proto = IPPROTO_UDP;
3025                 s->direction = direction;
3026                 s->af = af;
3027                 if (direction == PF_OUT) {
3028                         PF_ACPY(&s->gwy.addr, saddr, af);
3029                         s->gwy.port = uh->uh_sport;
3030                         PF_ACPY(&s->ext.addr, daddr, af);
3031                         s->ext.port = uh->uh_dport;
3032                         if (nr != NULL) {
3033                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3034                                 s->lan.port = bport;
3035                         } else {
3036                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3037                                 s->lan.port = s->gwy.port;
3038                         }
3039                 } else {
3040                         PF_ACPY(&s->lan.addr, daddr, af);
3041                         s->lan.port = uh->uh_dport;
3042                         PF_ACPY(&s->ext.addr, saddr, af);
3043                         s->ext.port = uh->uh_sport;
3044                         if (nr != NULL) {
3045                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3046                                 s->gwy.port = bport;
3047                         } else {
3048                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3049                                 s->gwy.port = s->lan.port;
3050                         }
3051                 }
3052                 s->src.state = PFUDPS_SINGLE;
3053                 s->dst.state = PFUDPS_NO_TRAFFIC;
3054                 s->creation = time_second;
3055                 s->expire = time_second;
3056                 s->timeout = PFTM_UDP_FIRST_PACKET;
3057                 pf_set_rt_ifp(s, saddr);
3058                 if (sn != NULL) {
3059                         s->src_node = sn;
3060                         s->src_node->states++;
3061                 }
3062                 if (nsn != NULL) {
3063                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3064                         s->nat_src_node = nsn;
3065                         s->nat_src_node->states++;
3066                 }
3067                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3068                         REASON_SET(&reason, PFRES_MEMORY);
3069                         pf_src_tree_remove_state(s);
3070                         pool_put(&pf_state_pl, s);
3071                         return (PF_DROP);
3072                 } else
3073                         *sm = s;
3074         }
3075
3076         /* copy back packet headers if we performed NAT operations */
3077         if (rewrite)
3078                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
3079
3080         return (PF_PASS);
3081 }
3082
3083 int
3084 pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction,
3085     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3086     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
3087 {
3088         struct pf_rule          *nr = NULL;
3089         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3090         struct pf_rule          *r, *a = NULL;
3091         struct pf_ruleset       *ruleset = NULL;
3092         struct pf_src_node      *nsn = NULL;
3093         u_short                  reason;
3094         u_int16_t                icmpid = 0;
3095         sa_family_t              af = pd->af;
3096         u_int8_t                 icmptype = 0, icmpcode = 0;
3097         int                      state_icmp = 0;
3098         int                      tag = -1;
3099 #ifdef INET6
3100         int                      rewrite = 0;
3101 #endif /* INET6 */
3102
3103         switch (pd->proto) {
3104 #ifdef INET
3105         case IPPROTO_ICMP:
3106                 icmptype = pd->hdr.icmp->icmp_type;
3107                 icmpcode = pd->hdr.icmp->icmp_code;
3108                 icmpid = pd->hdr.icmp->icmp_id;
3109
3110                 if (icmptype == ICMP_UNREACH ||
3111                     icmptype == ICMP_SOURCEQUENCH ||
3112                     icmptype == ICMP_REDIRECT ||
3113                     icmptype == ICMP_TIMXCEED ||
3114                     icmptype == ICMP_PARAMPROB)
3115                         state_icmp++;
3116                 break;
3117 #endif /* INET */
3118 #ifdef INET6
3119         case IPPROTO_ICMPV6:
3120                 icmptype = pd->hdr.icmp6->icmp6_type;
3121                 icmpcode = pd->hdr.icmp6->icmp6_code;
3122                 icmpid = pd->hdr.icmp6->icmp6_id;
3123
3124                 if (icmptype == ICMP6_DST_UNREACH ||
3125                     icmptype == ICMP6_PACKET_TOO_BIG ||
3126                     icmptype == ICMP6_TIME_EXCEEDED ||
3127                     icmptype == ICMP6_PARAM_PROB)
3128                         state_icmp++;
3129                 break;
3130 #endif /* INET6 */
3131         }
3132
3133         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3134
3135         if (direction == PF_OUT) {
3136                 /* check outgoing packet for BINAT/NAT */
3137                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3138                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3139                         PF_ACPY(&pd->baddr, saddr, af);
3140                         switch (af) {
3141 #ifdef INET
3142                         case AF_INET:
3143                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3144                                     pd->naddr.v4.s_addr, 0);
3145                                 break;
3146 #endif /* INET */
3147 #ifdef INET6
3148                         case AF_INET6:
3149                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3150                                     &pd->naddr, 0);
3151                                 rewrite++;
3152                                 break;
3153 #endif /* INET6 */
3154                         }
3155                         if (nr->natpass)
3156                                 r = NULL;
3157                         pd->nat_rule = nr;
3158                 }
3159         } else {
3160                 /* check incoming packet for BINAT/RDR */
3161                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3162                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3163                         PF_ACPY(&pd->baddr, daddr, af);
3164                         switch (af) {
3165 #ifdef INET
3166                         case AF_INET:
3167                                 pf_change_a(&daddr->v4.s_addr,
3168                                     pd->ip_sum, pd->naddr.v4.s_addr, 0);
3169                                 break;
3170 #endif /* INET */
3171 #ifdef INET6
3172                         case AF_INET6:
3173                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3174                                     &pd->naddr, 0);
3175                                 rewrite++;
3176                                 break;
3177 #endif /* INET6 */
3178                         }
3179                         if (nr->natpass)
3180                                 r = NULL;
3181                         pd->nat_rule = nr;
3182                 }
3183         }
3184
3185         while (r != NULL) {
3186                 r->evaluations++;
3187                 if (r->kif != NULL &&
3188                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3189                         r = r->skip[PF_SKIP_IFP].ptr;
3190                 else if (r->direction && r->direction != direction)
3191                         r = r->skip[PF_SKIP_DIR].ptr;
3192                 else if (r->af && r->af != af)
3193                         r = r->skip[PF_SKIP_AF].ptr;
3194                 else if (r->proto && r->proto != pd->proto)
3195                         r = r->skip[PF_SKIP_PROTO].ptr;
3196                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
3197                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3198                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
3199                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3200                 else if (r->type && r->type != icmptype + 1)
3201                         r = TAILQ_NEXT(r, entries);
3202                 else if (r->code && r->code != icmpcode + 1)
3203                         r = TAILQ_NEXT(r, entries);
3204                 else if (r->tos && !(r->tos & pd->tos))
3205                         r = TAILQ_NEXT(r, entries);
3206                 else if (r->rule_flag & PFRULE_FRAGMENT)
3207                         r = TAILQ_NEXT(r, entries);
3208                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3209                         r = TAILQ_NEXT(r, entries);
3210                 else if (r->anchorname[0] && r->anchor == NULL)
3211                         r = TAILQ_NEXT(r, entries);
3212                 else if (r->os_fingerprint != PF_OSFP_ANY)
3213                         r = TAILQ_NEXT(r, entries);
3214                 else {
3215                         if (r->tag)
3216                                 tag = r->tag;
3217                         if (r->anchor == NULL) {
3218                                 *rm = r;
3219                                 *am = a;
3220                                 *rsm = ruleset;
3221                                 if ((*rm)->quick)
3222                                         break;
3223                                 r = TAILQ_NEXT(r, entries);
3224                         } else
3225                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3226                                     PF_RULESET_FILTER);
3227                 }
3228                 if (r == NULL && a != NULL)
3229                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3230                             PF_RULESET_FILTER);
3231         }
3232         r = *rm;
3233         a = *am;
3234         ruleset = *rsm;
3235
3236         REASON_SET(&reason, PFRES_MATCH);
3237
3238         if (r->log) {
3239 #ifdef INET6
3240                 if (rewrite)
3241                         m_copyback(m, off, sizeof(struct icmp6_hdr),
3242                             (caddr_t)pd->hdr.icmp6);
3243 #endif /* INET6 */
3244                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3245         }
3246
3247         if (r->action != PF_PASS)
3248                 return (PF_DROP);
3249
3250         pf_tag_packet(m, tag);
3251
3252         if (!state_icmp && (r->keep_state || nr != NULL)) {
3253                 /* create new state */
3254                 struct pf_state *s = NULL;
3255                 struct pf_src_node *sn = NULL;
3256
3257                 /* check maximums */
3258                 if (r->max_states && (r->states >= r->max_states))
3259                         goto cleanup;
3260                 /* src node for flter rule */
3261                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3262                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3263                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3264                         goto cleanup;
3265                 /* src node for translation rule */
3266                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3267                     ((direction == PF_OUT &&
3268                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3269                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3270                         goto cleanup;
3271                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3272                 if (s == NULL) {
3273 cleanup:
3274                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3275                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3276                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3277                                 pf_status.src_nodes--;
3278                                 pool_put(&pf_src_tree_pl, sn);
3279                         }
3280                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3281                             nsn->expire == 0) {
3282                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3283                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3284                                 pf_status.src_nodes--;
3285                                 pool_put(&pf_src_tree_pl, nsn);
3286                         }
3287                         REASON_SET(&reason, PFRES_MEMORY);
3288                         return (PF_DROP);
3289                 }
3290                 bzero(s, sizeof(*s));
3291                 r->states++;
3292                 if (a != NULL)
3293                         a->states++;
3294                 s->rule.ptr = r;
3295                 s->nat_rule.ptr = nr;
3296                 if (s->nat_rule.ptr != NULL)
3297                         s->nat_rule.ptr->states++;
3298                 s->anchor.ptr = a;
3299                 s->allow_opts = r->allow_opts;
3300                 s->log = r->log & 2;
3301                 s->proto = pd->proto;
3302                 s->direction = direction;
3303                 s->af = af;
3304                 if (direction == PF_OUT) {
3305                         PF_ACPY(&s->gwy.addr, saddr, af);
3306                         s->gwy.port = icmpid;
3307                         PF_ACPY(&s->ext.addr, daddr, af);
3308                         s->ext.port = icmpid;
3309                         if (nr != NULL)
3310                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3311                         else
3312                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3313                         s->lan.port = icmpid;
3314                 } else {
3315                         PF_ACPY(&s->lan.addr, daddr, af);
3316                         s->lan.port = icmpid;
3317                         PF_ACPY(&s->ext.addr, saddr, af);
3318                         s->ext.port = icmpid;
3319                         if (nr != NULL)
3320                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3321                         else
3322                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3323                         s->gwy.port = icmpid;
3324                 }
3325                 s->creation = time_second;
3326                 s->expire = time_second;
3327                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3328                 pf_set_rt_ifp(s, saddr);
3329                 if (sn != NULL) {
3330                         s->src_node = sn;
3331                         s->src_node->states++;
3332                 }
3333                 if (nsn != NULL) {
3334                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3335                         s->nat_src_node = nsn;
3336                         s->nat_src_node->states++;
3337                 }
3338                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3339                         REASON_SET(&reason, PFRES_MEMORY);
3340                         pf_src_tree_remove_state(s);
3341                         pool_put(&pf_state_pl, s);
3342                         return (PF_DROP);
3343                 } else
3344                         *sm = s;
3345         }
3346
3347 #ifdef INET6
3348         /* copy back packet headers if we performed IPv6 NAT operations */
3349         if (rewrite)
3350                 m_copyback(m, off, sizeof(struct icmp6_hdr),
3351                     (caddr_t)pd->hdr.icmp6);
3352 #endif /* INET6 */
3353
3354         return (PF_PASS);
3355 }
3356
3357 int
3358 pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction,
3359     struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3360     struct pf_rule **am, struct pf_ruleset **rsm)
3361 {
3362         struct pf_rule          *nr = NULL;
3363         struct pf_rule          *r, *a = NULL;
3364         struct pf_ruleset       *ruleset = NULL;
3365         struct pf_src_node      *nsn = NULL;
3366         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3367         sa_family_t              af = pd->af;
3368         u_short                  reason;
3369         int                      tag = -1;
3370
3371         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3372
3373         if (direction == PF_OUT) {
3374                 /* check outgoing packet for BINAT/NAT */
3375                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3376                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3377                         PF_ACPY(&pd->baddr, saddr, af);
3378                         switch (af) {
3379 #ifdef INET
3380                         case AF_INET:
3381                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3382                                     pd->naddr.v4.s_addr, 0);
3383                                 break;
3384 #endif /* INET */
3385 #ifdef INET6
3386                         case AF_INET6:
3387                                 PF_ACPY(saddr, &pd->naddr, af);
3388                                 break;
3389 #endif /* INET6 */
3390                         }
3391                         if (nr->natpass)
3392                                 r = NULL;
3393                         pd->nat_rule = nr;
3394                 }
3395         } else {
3396                 /* check incoming packet for BINAT/RDR */
3397                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3398                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3399                         PF_ACPY(&pd->baddr, daddr, af);
3400                         switch (af) {
3401 #ifdef INET
3402                         case AF_INET:
3403                                 pf_change_a(&daddr->v4.s_addr,
3404                                     pd->ip_sum, pd->naddr.v4.s_addr, 0);
3405                                 break;
3406 #endif /* INET */
3407 #ifdef INET6
3408                         case AF_INET6:
3409                                 PF_ACPY(daddr, &pd->naddr, af);
3410                                 break;
3411 #endif /* INET6 */
3412                         }
3413                         if (nr->natpass)
3414                                 r = NULL;
3415                         pd->nat_rule = nr;
3416                 }
3417         }
3418
3419         while (r != NULL) {
3420                 r->evaluations++;
3421                 if (r->kif != NULL &&
3422                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3423                         r = r->skip[PF_SKIP_IFP].ptr;
3424                 else if (r->direction && r->direction != direction)
3425                         r = r->skip[PF_SKIP_DIR].ptr;
3426                 else if (r->af && r->af != af)
3427                         r = r->skip[PF_SKIP_AF].ptr;
3428                 else if (r->proto && r->proto != pd->proto)
3429                         r = r->skip[PF_SKIP_PROTO].ptr;
3430                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3431                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3432                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3433                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3434                 else if (r->tos && !(r->tos & pd->tos))
3435                         r = TAILQ_NEXT(r, entries);
3436                 else if (r->rule_flag & PFRULE_FRAGMENT)
3437                         r = TAILQ_NEXT(r, entries);
3438                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3439                         r = TAILQ_NEXT(r, entries);
3440                 else if (r->anchorname[0] && r->anchor == NULL)
3441                         r = TAILQ_NEXT(r, entries);
3442                 else if (r->os_fingerprint != PF_OSFP_ANY)
3443                         r = TAILQ_NEXT(r, entries);
3444                 else {
3445                         if (r->tag)
3446                                 tag = r->tag;
3447                         if (r->anchor == NULL) {
3448                                 *rm = r;
3449                                 *am = a;
3450                                 *rsm = ruleset;
3451                                 if ((*rm)->quick)
3452                                         break;
3453                                 r = TAILQ_NEXT(r, entries);
3454                         } else
3455                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3456                                     PF_RULESET_FILTER);
3457                 }
3458                 if (r == NULL && a != NULL)
3459                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3460                             PF_RULESET_FILTER);
3461         }
3462         r = *rm;
3463         a = *am;
3464         ruleset = *rsm;
3465
3466         REASON_SET(&reason, PFRES_MATCH);
3467
3468         if (r->log)
3469                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3470
3471         if ((r->action == PF_DROP) &&
3472             ((r->rule_flag & PFRULE_RETURNICMP) ||
3473             (r->rule_flag & PFRULE_RETURN))) {
3474                 struct pf_addr *a = NULL;
3475
3476                 if (nr != NULL) {
3477                         if (direction == PF_OUT)
3478                                 a = saddr;
3479                         else
3480                                 a = daddr;
3481                 }
3482                 if (a != NULL) {
3483                         switch (af) {
3484 #ifdef INET
3485                         case AF_INET:
3486                                 pf_change_a(&a->v4.s_addr, pd->ip_sum,
3487                                     pd->baddr.v4.s_addr, 0);
3488                                 break;
3489 #endif /* INET */
3490 #ifdef INET6
3491                         case AF_INET6:
3492                                 PF_ACPY(a, &pd->baddr, af);
3493                                 break;
3494 #endif /* INET6 */
3495                         }
3496                 }
3497                 if ((af == AF_INET) && r->return_icmp)
3498                         pf_send_icmp(m, r->return_icmp >> 8,
3499                             r->return_icmp & 255, af, r);
3500                 else if ((af == AF_INET6) && r->return_icmp6)
3501                         pf_send_icmp(m, r->return_icmp6 >> 8,
3502                             r->return_icmp6 & 255, af, r);
3503         }
3504
3505         if (r->action != PF_PASS)
3506                 return (PF_DROP);
3507
3508         pf_tag_packet(m, tag);
3509
3510         if (r->keep_state || nr != NULL) {
3511                 /* create new state */
3512                 struct pf_state *s = NULL;
3513                 struct pf_src_node *sn = NULL;
3514
3515                 /* check maximums */
3516                 if (r->max_states && (r->states >= r->max_states))
3517                         goto cleanup;
3518                 /* src node for flter rule */
3519                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3520                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3521                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3522                         goto cleanup;
3523                 /* src node for translation rule */
3524                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3525                     ((direction == PF_OUT &&
3526                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3527                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3528                         goto cleanup;
3529                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3530                 if (s == NULL) {
3531 cleanup:
3532                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3533                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3534                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3535                                 pf_status.src_nodes--;
3536                                 pool_put(&pf_src_tree_pl, sn);
3537                         }
3538                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3539                             nsn->expire == 0) {
3540                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3541                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3542                                 pf_status.src_nodes--;
3543                                 pool_put(&pf_src_tree_pl, nsn);
3544                         }
3545                         REASON_SET(&reason, PFRES_MEMORY);
3546                         return (PF_DROP);
3547                 }
3548                 bzero(s, sizeof(*s));
3549                 r->states++;
3550                 if (a != NULL)
3551                         a->states++;
3552                 s->rule.ptr = r;
3553                 s->nat_rule.ptr = nr;
3554                 if (s->nat_rule.ptr != NULL)
3555                         s->nat_rule.ptr->states++;
3556                 s->anchor.ptr = a;
3557                 s->allow_opts = r->allow_opts;
3558                 s->log = r->log & 2;
3559                 s->proto = pd->proto;
3560                 s->direction = direction;
3561                 s->af = af;
3562                 if (direction == PF_OUT) {
3563                         PF_ACPY(&s->gwy.addr, saddr, af);
3564                         PF_ACPY(&s->ext.addr, daddr, af);
3565                         if (nr != NULL)
3566                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3567                         else
3568                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3569                 } else {
3570                         PF_ACPY(&s->lan.addr, daddr, af);
3571                         PF_ACPY(&s->ext.addr, saddr, af);
3572                         if (nr != NULL)
3573                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3574                         else
3575                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3576                 }
3577                 s->src.state = PFOTHERS_SINGLE;
3578                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3579                 s->creation = time_second;
3580                 s->expire = time_second;
3581                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3582                 pf_set_rt_ifp(s, saddr);
3583                 if (sn != NULL) {
3584                         s->src_node = sn;
3585                         s->src_node->states++;
3586                 }
3587                 if (nsn != NULL) {
3588                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3589                         s->nat_src_node = nsn;
3590                         s->nat_src_node->states++;
3591                 }
3592                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3593                         REASON_SET(&reason, PFRES_MEMORY);
3594                         pf_src_tree_remove_state(s);
3595                         pool_put(&pf_state_pl, s);
3596                         return (PF_DROP);
3597                 } else
3598                         *sm = s;
3599         }
3600
3601         return (PF_PASS);
3602 }
3603
3604 int
3605 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3606     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3607     struct pf_ruleset **rsm)
3608 {
3609         struct pf_rule          *r, *a = NULL;
3610         struct pf_ruleset       *ruleset = NULL;
3611         sa_family_t              af = pd->af;
3612         u_short                  reason;
3613         int                      tag = -1;
3614
3615         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3616         while (r != NULL) {
3617                 r->evaluations++;
3618                 if (r->kif != NULL &&
3619                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3620                         r = r->skip[PF_SKIP_IFP].ptr;
3621                 else if (r->direction && r->direction != direction)
3622                         r = r->skip[PF_SKIP_DIR].ptr;
3623                 else if (r->af && r->af != af)
3624                         r = r->skip[PF_SKIP_AF].ptr;
3625                 else if (r->proto && r->proto != pd->proto)
3626                         r = r->skip[PF_SKIP_PROTO].ptr;
3627                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3628                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3629                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3630                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3631                 else if (r->tos && !(r->tos & pd->tos))
3632                         r = TAILQ_NEXT(r, entries);
3633                 else if (r->src.port_op || r->dst.port_op ||
3634                     r->flagset || r->type || r->code ||
3635                     r->os_fingerprint != PF_OSFP_ANY)
3636                         r = TAILQ_NEXT(r, entries);
3637                 else if (r->match_tag && !pf_match_tag(m, r, NULL, &tag))
3638                         r = TAILQ_NEXT(r, entries);
3639                 else if (r->anchorname[0] && r->anchor == NULL)
3640                         r = TAILQ_NEXT(r, entries);
3641                 else {
3642                         if (r->anchor == NULL) {
3643                                 *rm = r;
3644                                 *am = a;
3645                                 *rsm = ruleset;
3646                                 if ((*rm)->quick)
3647                                         break;
3648                                 r = TAILQ_NEXT(r, entries);
3649                         } else
3650                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3651                                     PF_RULESET_FILTER);
3652                 }
3653                 if (r == NULL && a != NULL)
3654                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3655                             PF_RULESET_FILTER);
3656         }
3657         r = *rm;
3658         a = *am;
3659         ruleset = *rsm;
3660
3661         REASON_SET(&reason, PFRES_MATCH);
3662
3663         if (r->log)
3664                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3665
3666         if (r->action != PF_PASS)
3667                 return (PF_DROP);
3668
3669         pf_tag_packet(m, tag);
3670
3671         return (PF_PASS);
3672 }
3673
3674 int
3675 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
3676     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3677     u_short *reason)
3678 {
3679         struct pf_state          key;
3680         struct tcphdr           *th = pd->hdr.tcp;
3681         u_int16_t                win = ntohs(th->th_win);
3682         u_int32_t                ack, end, seq;
3683         u_int8_t                 sws, dws;
3684         int                      ackskew;
3685         int                      copyback = 0;
3686         struct pf_state_peer    *src, *dst;
3687
3688         key.af = pd->af;
3689         key.proto = IPPROTO_TCP;
3690         if (direction == PF_IN) {
3691                 PF_ACPY(&key.ext.addr, pd->src, key.af);
3692                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
3693                 key.ext.port = th->th_sport;
3694                 key.gwy.port = th->th_dport;
3695         } else {
3696                 PF_ACPY(&key.lan.addr, pd->src, key.af);
3697                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
3698                 key.lan.port = th->th_sport;
3699                 key.ext.port = th->th_dport;
3700         }
3701
3702         STATE_LOOKUP();
3703
3704         if (direction == (*state)->direction) {
3705                 src = &(*state)->src;
3706                 dst = &(*state)->dst;
3707         } else {
3708                 src = &(*state)->dst;
3709                 dst = &(*state)->src;
3710         }
3711
3712         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
3713                 if (direction != (*state)->direction)
3714                         return (PF_SYNPROXY_DROP);
3715                 if (th->th_flags & TH_SYN) {
3716                         if (ntohl(th->th_seq) != (*state)->src.seqlo)
3717                                 return (PF_DROP);
3718                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3719                             pd->src, th->th_dport, th->th_sport,
3720                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
3721                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0);
3722                         return (PF_SYNPROXY_DROP);
3723                 } else if (!(th->th_flags & TH_ACK) ||
3724                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3725                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3726                         return (PF_DROP);
3727                 else
3728                         (*state)->src.state = PF_TCPS_PROXY_DST;
3729         }
3730         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
3731                 struct pf_state_host *src, *dst;
3732
3733                 if (direction == PF_OUT) {
3734                         src = &(*state)->gwy;
3735                         dst = &(*state)->ext;
3736                 } else {
3737                         src = &(*state)->ext;
3738                         dst = &(*state)->lan;
3739                 }
3740                 if (direction == (*state)->direction) {
3741                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
3742                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3743                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3744                                 return (PF_DROP);
3745                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
3746                         if ((*state)->dst.seqhi == 1)
3747                                 (*state)->dst.seqhi = arc4random();
3748                         pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3749                             &dst->addr, src->port, dst->port,
3750                             (*state)->dst.seqhi, 0, TH_SYN, 0,
3751                             (*state)->src.mss, 0);
3752                         return (PF_SYNPROXY_DROP);
3753                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
3754                     (TH_SYN|TH_ACK)) ||
3755                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1))
3756                         return (PF_DROP);
3757                 else {
3758                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
3759                         (*state)->dst.seqlo = ntohl(th->th_seq);
3760                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3761                             pd->src, th->th_dport, th->th_sport,
3762                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
3763                             TH_ACK, (*state)->src.max_win, 0, 0);
3764                         pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3765                             &dst->addr, src->port, dst->port,
3766                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
3767                             TH_ACK, (*state)->dst.max_win, 0, 0);
3768                         (*state)->src.seqdiff = (*state)->dst.seqhi -
3769                             (*state)->src.seqlo;
3770                         (*state)->dst.seqdiff = (*state)->src.seqhi -
3771                             (*state)->dst.seqlo;
3772                         (*state)->src.seqhi = (*state)->src.seqlo +
3773                             (*state)->src.max_win;
3774                         (*state)->dst.seqhi = (*state)->dst.seqlo +
3775                             (*state)->dst.max_win;
3776                         (*state)->src.wscale = (*state)->dst.wscale = 0;
3777                         (*state)->src.state = (*state)->dst.state =
3778                             TCPS_ESTABLISHED;
3779                         return (PF_SYNPROXY_DROP);
3780                 }
3781         }
3782
3783         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3784                 sws = src->wscale & PF_WSCALE_MASK;
3785                 dws = dst->wscale & PF_WSCALE_MASK;
3786         } else
3787                 sws = dws = 0;
3788
3789         /*
3790          * Sequence tracking algorithm from Guido van Rooij's paper:
3791          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3792          *      tcp_filtering.ps
3793          */
3794
3795         seq = ntohl(th->th_seq);
3796         if (src->seqlo == 0) {
3797                 /* First packet from this end. Set its state */
3798
3799                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3800                     src->scrub == NULL) {
3801                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3802                                 REASON_SET(reason, PFRES_MEMORY);
3803                                 return (PF_DROP);
3804                         }
3805                 }
3806
3807                 /* Deferred generation of sequence number modulator */
3808                 if (dst->seqdiff && !src->seqdiff) {
3809                         while ((src->seqdiff = arc4random()) == 0)
3810                                 ;
3811                         ack = ntohl(th->th_ack) - dst->seqdiff;
3812                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3813                             src->seqdiff), 0);
3814                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3815                         copyback = 1;
3816                 } else {
3817                         ack = ntohl(th->th_ack);
3818                 }
3819
3820                 end = seq + pd->p_len;
3821                 if (th->th_flags & TH_SYN) {
3822                         end++;
3823                         if (dst->wscale & PF_WSCALE_FLAG) {
3824                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3825                                     pd->af);
3826                                 if (src->wscale & PF_WSCALE_FLAG) {
3827                                         /* Remove scale factor from initial
3828                                          * window */
3829                                         sws = src->wscale & PF_WSCALE_MASK;
3830                                         win = ((u_int32_t)win + (1 << sws) - 1)
3831                                             >> sws;
3832                                         dws = dst->wscale & PF_WSCALE_MASK;
3833                                 } else {
3834                                         /* fixup other window */
3835                                         dst->max_win <<= dst->wscale &
3836                                             PF_WSCALE_MASK;
3837                                         /* in case of a retrans SYN|ACK */
3838                                         dst->wscale = 0;
3839                                 }
3840                         }
3841                 }
3842                 if (th->th_flags & TH_FIN)
3843                         end++;
3844
3845                 src->seqlo = seq;
3846                 if (src->state < TCPS_SYN_SENT)
3847                         src->state = TCPS_SYN_SENT;
3848
3849                 /*
3850                  * May need to slide the window (seqhi may have been set by
3851                  * the crappy stack check or if we picked up the connection
3852                  * after establishment)
3853                  */
3854                 if (src->seqhi == 1 ||
3855                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3856                         src->seqhi = end + MAX(1, dst->max_win << dws);
3857                 if (win > src->max_win)
3858                         src->max_win = win;
3859
3860         } else {
3861                 ack = ntohl(th->th_ack) - dst->seqdiff;
3862                 if (src->seqdiff) {
3863                         /* Modulate sequence numbers */
3864                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3865                             src->seqdiff), 0);
3866                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3867                         copyback = 1;
3868                 }
3869                 end = seq + pd->p_len;
3870                 if (th->th_flags & TH_SYN)
3871                         end++;
3872                 if (th->th_flags & TH_FIN)
3873                         end++;
3874         }
3875
3876         if ((th->th_flags & TH_ACK) == 0) {
3877                 /* Let it pass through the ack skew check */
3878                 ack = dst->seqlo;
3879         } else if ((ack == 0 &&
3880             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3881             /* broken tcp stacks do not set ack */
3882             (dst->state < TCPS_SYN_SENT)) {
3883                 /*
3884                  * Many stacks (ours included) will set the ACK number in an
3885                  * FIN|ACK if the SYN times out -- no sequence to ACK.
3886                  */
3887                 ack = dst->seqlo;
3888         }
3889
3890         if (seq == end) {
3891                 /* Ease sequencing restrictions on no data packets */
3892                 seq = src->seqlo;
3893                 end = seq;
3894         }
3895
3896         ackskew = dst->seqlo - ack;
3897
3898 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
3899         if (SEQ_GEQ(src->seqhi, end) &&
3900             /* Last octet inside other's window space */
3901             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
3902             /* Retrans: not more than one window back */
3903             (ackskew >= -MAXACKWINDOW) &&
3904             /* Acking not more than one reassembled fragment backwards */
3905             (ackskew <= (MAXACKWINDOW << sws))) {
3906             /* Acking not more than one window forward */
3907
3908                 /* update max window */
3909                 if (src->max_win < win)
3910                         src->max_win = win;
3911                 /* synchronize sequencing */
3912                 if (SEQ_GT(end, src->seqlo))
3913                         src->seqlo = end;
3914                 /* slide the window of what the other end can send */
3915                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
3916                         dst->seqhi = ack + MAX((win << sws), 1);
3917
3918
3919                 /* update states */
3920                 if (th->th_flags & TH_SYN)
3921                         if (src->state < TCPS_SYN_SENT)
3922                                 src->state = TCPS_SYN_SENT;
3923                 if (th->th_flags & TH_FIN)
3924                         if (src->state < TCPS_CLOSING)
3925                                 src->state = TCPS_CLOSING;
3926                 if (th->th_flags & TH_ACK) {
3927                         if (dst->state == TCPS_SYN_SENT)
3928                                 dst->state = TCPS_ESTABLISHED;
3929                         else if (dst->state == TCPS_CLOSING)
3930                                 dst->state = TCPS_FIN_WAIT_2;
3931                 }
3932                 if (th->th_flags & TH_RST)
3933                         src->state = dst->state = TCPS_TIME_WAIT;
3934
3935                 /* update expire time */
3936                 (*state)->expire = time_second;
3937                 if (src->state >= TCPS_FIN_WAIT_2 &&
3938                     dst->state >= TCPS_FIN_WAIT_2)
3939                         (*state)->timeout = PFTM_TCP_CLOSED;
3940                 else if (src->state >= TCPS_FIN_WAIT_2 ||
3941                     dst->state >= TCPS_FIN_WAIT_2)
3942                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
3943                 else if (src->state < TCPS_ESTABLISHED ||
3944                     dst->state < TCPS_ESTABLISHED)
3945                         (*state)->timeout = PFTM_TCP_OPENING;
3946                 else if (src->state >= TCPS_CLOSING ||
3947                     dst->state >= TCPS_CLOSING)
3948                         (*state)->timeout = PFTM_TCP_CLOSING;
3949                 else
3950                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
3951
3952                 /* Fall through to PASS packet */
3953
3954         } else if ((dst->state < TCPS_SYN_SENT ||
3955                 dst->state >= TCPS_FIN_WAIT_2 ||
3956                 src->state >= TCPS_FIN_WAIT_2) &&
3957             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
3958             /* Within a window forward of the originating packet */
3959             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
3960             /* Within a window backward of the originating packet */
3961
3962                 /*
3963                  * This currently handles three situations:
3964                  *  1) Stupid stacks will shotgun SYNs before their peer
3965                  *     replies.
3966                  *  2) When PF catches an already established stream (the
3967                  *     firewall rebooted, the state table was flushed, routes
3968                  *     changed...)
3969                  *  3) Packets get funky immediately after the connection
3970                  *     closes (this should catch Solaris spurious ACK|FINs
3971                  *     that web servers like to spew after a close)
3972                  *
3973                  * This must be a little more careful than the above code
3974                  * since packet floods will also be caught here. We don't
3975                  * update the TTL here to mitigate the damage of a packet
3976                  * flood and so the same code can handle awkward establishment
3977                  * and a loosened connection close.
3978                  * In the establishment case, a correct peer response will
3979                  * validate the connection, go through the normal state code
3980                  * and keep updating the state TTL.
3981                  */
3982
3983                 if (pf_status.debug >= PF_DEBUG_MISC) {
3984                         printf("pf: loose state match: ");
3985                         pf_print_state(*state);
3986                         pf_print_flags(th->th_flags);
3987                         printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n",
3988                             seq, ack, pd->p_len, ackskew,
3989                             (*state)->packets[0], (*state)->packets[1]);
3990                 }
3991
3992                 /* update max window */
3993                 if (src->max_win < win)
3994                         src->max_win = win;
3995                 /* synchronize sequencing */
3996                 if (SEQ_GT(end, src->seqlo))
3997                         src->seqlo = end;
3998                 /* slide the window of what the other end can send */
3999                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4000                         dst->seqhi = ack + MAX((win << sws), 1);
4001
4002                 /*
4003                  * Cannot set dst->seqhi here since this could be a shotgunned
4004                  * SYN and not an already established connection.
4005                  */
4006
4007                 if (th->th_flags & TH_FIN)
4008                         if (src->state < TCPS_CLOSING)
4009                                 src->state = TCPS_CLOSING;
4010                 if (th->th_flags & TH_RST)
4011                         src->state = dst->state = TCPS_TIME_WAIT;
4012
4013                 /* Fall through to PASS packet */
4014
4015         } else {
4016                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4017                     (*state)->src.state == TCPS_SYN_SENT) {
4018                         /* Send RST for state mismatches during handshake */
4019                         if (!(th->th_flags & TH_RST)) {
4020                                 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
4021
4022                                 if (th->th_flags & TH_SYN)
4023                                         ack++;
4024                                 if (th->th_flags & TH_FIN)
4025                                         ack++;
4026                                 pf_send_tcp((*state)->rule.ptr, pd->af,
4027                                     pd->dst, pd->src, th->th_dport,
4028                                     th->th_sport, ntohl(th->th_ack), ack,
4029                                     TH_RST|TH_ACK, 0, 0,
4030                                     (*state)->rule.ptr->return_ttl);
4031                         }
4032                         src->seqlo = 0;
4033                         src->seqhi = 1;
4034                         src->max_win = 1;
4035                 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4036                         printf("pf: BAD state: ");
4037                         pf_print_state(*state);
4038                         pf_print_flags(th->th_flags);
4039                         printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d "
4040                             "dir=%s,%s\n", seq, ack, pd->p_len, ackskew,
4041                             (*state)->packets[0], (*state)->packets[1],
4042                             direction == PF_IN ? "in" : "out",
4043                             direction == (*state)->direction ? "fwd" : "rev");
4044                         printf("pf: State failure on: %c %c %c %c | %c %c\n",
4045                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4046                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4047                             ' ': '2',
4048                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4049                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4050                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4051                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4052                 }
4053                 return (PF_DROP);
4054         }
4055
4056         if (dst->scrub || src->scrub) {
4057                 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4058                     src, dst, &copyback))
4059                         return (PF_DROP);
4060         }
4061
4062         /* Any packets which have gotten here are to be passed */
4063
4064         /* translate source/destination address, if necessary */
4065         if (STATE_TRANSLATE(*state)) {
4066                 if (direction == PF_OUT)
4067                         pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4068                             &th->th_sum, &(*state)->gwy.addr,
4069                             (*state)->gwy.port, 0, pd->af);
4070                 else
4071                         pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4072                             &th->th_sum, &(*state)->lan.addr,
4073                             (*state)->lan.port, 0, pd->af);
4074                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4075         } else if (copyback) {
4076                 /* Copyback sequence modulation or stateful scrub changes */
4077                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4078         }
4079
4080         return (PF_PASS);
4081 }
4082
4083 int
4084 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4085     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4086 {
4087         struct pf_state_peer    *src, *dst;
4088         struct pf_state          key;
4089         struct udphdr           *uh = pd->hdr.udp;
4090
4091         key.af = pd->af;
4092         key.proto = IPPROTO_UDP;
4093         if (direction == PF_IN) {
4094                 PF_ACPY(&key.ext.addr, pd->src, key.af);
4095                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4096                 key.ext.port = uh->uh_sport;
4097                 key.gwy.port = uh->uh_dport;
4098         } else {
4099                 PF_ACPY(&key.lan.addr, pd->src, key.af);
4100                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4101                 key.lan.port = uh->uh_sport;
4102                 key.ext.port = uh->uh_dport;
4103         }
4104
4105         STATE_LOOKUP();
4106
4107         if (direction == (*state)->direction) {
4108                 src = &(*state)->src;
4109                 dst = &(*state)->dst;
4110         } else {
4111                 src = &(*state)->dst;
4112                 dst = &(*state)->src;
4113         }
4114
4115         /* update states */
4116         if (src->state < PFUDPS_SINGLE)
4117                 src->state = PFUDPS_SINGLE;
4118         if (dst->state == PFUDPS_SINGLE)
4119                 dst->state = PFUDPS_MULTIPLE;
4120
4121         /* update expire time */
4122         (*state)->expire = time_second;
4123         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4124                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4125         else
4126                 (*state)->timeout = PFTM_UDP_SINGLE;
4127
4128         /* translate source/destination address, if necessary */
4129         if (STATE_TRANSLATE(*state)) {
4130                 if (direction == PF_OUT)
4131                         pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4132                             &uh->uh_sum, &(*state)->gwy.addr,
4133                             (*state)->gwy.port, 1, pd->af);
4134                 else
4135                         pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4136                             &uh->uh_sum, &(*state)->lan.addr,
4137                             (*state)->lan.port, 1, pd->af);
4138                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4139         }
4140
4141         return (PF_PASS);
4142 }
4143
4144 int
4145 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4146     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4147 {
4148         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4149         u_int16_t        icmpid = 0;
4150         u_int16_t       *icmpsum = NULL;
4151         u_int8_t         icmptype = 0;
4152         int              state_icmp = 0;
4153
4154         switch (pd->proto) {
4155 #ifdef INET
4156         case IPPROTO_ICMP:
4157                 icmptype = pd->hdr.icmp->icmp_type;
4158                 icmpid = pd->hdr.icmp->icmp_id;
4159                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4160
4161                 if (icmptype == ICMP_UNREACH ||
4162                     icmptype == ICMP_SOURCEQUENCH ||
4163                     icmptype == ICMP_REDIRECT ||
4164                     icmptype == ICMP_TIMXCEED ||
4165                     icmptype == ICMP_PARAMPROB)
4166                         state_icmp++;
4167                 break;
4168 #endif /* INET */
4169 #ifdef INET6
4170         case IPPROTO_ICMPV6:
4171                 icmptype = pd->hdr.icmp6->icmp6_type;
4172                 icmpid = pd->hdr.icmp6->icmp6_id;
4173                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4174
4175                 if (icmptype == ICMP6_DST_UNREACH ||
4176                     icmptype == ICMP6_PACKET_TOO_BIG ||
4177                     icmptype == ICMP6_TIME_EXCEEDED ||
4178                     icmptype == ICMP6_PARAM_PROB)
4179                         state_icmp++;
4180                 break;
4181 #endif /* INET6 */
4182         }
4183
4184         if (!state_icmp) {
4185
4186                 /*
4187                  * ICMP query/reply message not related to a TCP/UDP packet.
4188                  * Search for an ICMP state.
4189                  */
4190                 struct pf_state         key;
4191
4192                 key.af = pd->af;
4193                 key.proto = pd->proto;
4194                 if (direction == PF_IN) {
4195                         PF_ACPY(&key.ext.addr, pd->src, key.af);
4196                         PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4197                         key.ext.port = icmpid;
4198                         key.gwy.port = icmpid;
4199                 } else {
4200                         PF_ACPY(&key.lan.addr, pd->src, key.af);
4201                         PF_ACPY(&key.ext.addr, pd->dst, key.af);
4202                         key.lan.port = icmpid;
4203                         key.ext.port = icmpid;
4204                 }
4205
4206                 STATE_LOOKUP();
4207
4208                 (*state)->expire = time_second;
4209                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4210
4211                 /* translate source/destination address, if necessary */
4212                 if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) {
4213                         if (direction == PF_OUT) {
4214                                 switch (pd->af) {
4215 #ifdef INET
4216                                 case AF_INET:
4217                                         pf_change_a(&saddr->v4.s_addr,
4218                                             pd->ip_sum,
4219                                             (*state)->gwy.addr.v4.s_addr, 0);
4220                                         break;
4221 #endif /* INET */
4222 #ifdef INET6
4223                                 case AF_INET6:
4224                                         pf_change_a6(saddr,
4225                                             &pd->hdr.icmp6->icmp6_cksum,
4226                                             &(*state)->gwy.addr, 0);
4227                                         m_copyback(m, off,
4228                                             sizeof(struct icmp6_hdr),
4229                                             (caddr_t)pd->hdr.icmp6);
4230                                         break;
4231 #endif /* INET6 */
4232                                 }
4233                         } else {
4234                                 switch (pd->af) {
4235 #ifdef INET
4236                                 case AF_INET:
4237                                         pf_change_a(&daddr->v4.s_addr,
4238                                             pd->ip_sum,
4239                                             (*state)->lan.addr.v4.s_addr, 0);
4240                                         break;
4241 #endif /* INET */
4242 #ifdef INET6
4243                                 case AF_INET6:
4244                                         pf_change_a6(daddr,
4245                                             &pd->hdr.icmp6->icmp6_cksum,
4246                                             &(*state)->lan.addr, 0);
4247                                         m_copyback(m, off,
4248                                             sizeof(struct icmp6_hdr),
4249                                             (caddr_t)pd->hdr.icmp6);
4250                                         break;
4251 #endif /* INET6 */
4252                                 }
4253                         }
4254                 }
4255
4256                 return (PF_PASS);
4257
4258         } else {
4259                 /*
4260                  * ICMP error message in response to a TCP/UDP packet.
4261                  * Extract the inner TCP/UDP header and search for that state.
4262                  */
4263
4264                 struct pf_pdesc pd2;
4265 #ifdef INET
4266                 struct ip       h2;
4267 #endif /* INET */
4268 #ifdef INET6
4269                 struct ip6_hdr  h2_6;
4270                 int             terminal = 0;
4271 #endif /* INET6 */
4272                 int             ipoff2 = 0;
4273                 int             off2 = 0;
4274
4275                 pd2.af = pd->af;
4276                 switch (pd->af) {
4277 #ifdef INET
4278                 case AF_INET:
4279                         /* offset of h2 in mbuf chain */
4280                         ipoff2 = off + ICMP_MINLEN;
4281
4282                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4283                             NULL, NULL, pd2.af)) {
4284                                 DPFPRINTF(PF_DEBUG_MISC,
4285                                     ("pf: ICMP error message too short "
4286                                     "(ip)\n"));
4287                                 return (PF_DROP);
4288                         }
4289                         /*
4290                          * ICMP error messages don't refer to non-first
4291                          * fragments
4292                          */
4293                         /*
4294                          * Note: We are dealing with an encapsulated
4295                          * header. This means ip_off/ip_len are not
4296                          * in host byte order!
4297                          */
4298                         if (h2.ip_off & htons(IP_OFFMASK))
4299                                 return (PF_DROP);
4300
4301                         /* offset of protocol header that follows h2 */
4302                         off2 = ipoff2 + (h2.ip_hl << 2);
4303
4304                         pd2.proto = h2.ip_p;
4305                         pd2.src = (struct pf_addr *)&h2.ip_src;
4306                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4307                         pd2.ip_sum = &h2.ip_sum;
4308                         break;
4309 #endif /* INET */
4310 #ifdef INET6
4311                 case AF_INET6:
4312                         ipoff2 = off + sizeof(struct icmp6_hdr);
4313
4314                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4315                             NULL, NULL, pd2.af)) {
4316                                 DPFPRINTF(PF_DEBUG_MISC,
4317                                     ("pf: ICMP error message too short "
4318                                     "(ip6)\n"));
4319                                 return (PF_DROP);
4320                         }
4321                         pd2.proto = h2_6.ip6_nxt;
4322                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4323                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4324                         pd2.ip_sum = NULL;
4325                         off2 = ipoff2 + sizeof(h2_6);
4326                         do {
4327                                 switch (pd2.proto) {
4328                                 case IPPROTO_FRAGMENT:
4329                                         /*
4330                                          * ICMPv6 error messages for
4331                                          * non-first fragments
4332                                          */
4333                                         return (PF_DROP);
4334                                 case IPPROTO_AH:
4335                                 case IPPROTO_HOPOPTS:
4336                                 case IPPROTO_ROUTING:
4337                                 case IPPROTO_DSTOPTS: {
4338                                         /* get next header and header length */
4339                                         struct ip6_ext opt6;
4340
4341                                         if (!pf_pull_hdr(m, off2, &opt6,
4342                                             sizeof(opt6), NULL, NULL, pd2.af)) {
4343                                                 DPFPRINTF(PF_DEBUG_MISC,
4344                                                     ("pf: ICMPv6 short opt\n"));
4345                                                 return (PF_DROP);
4346                                         }
4347                                         if (pd2.proto == IPPROTO_AH)
4348                                                 off2 += (opt6.ip6e_len + 2) * 4;
4349                                         else
4350                                                 off2 += (opt6.ip6e_len + 1) * 8;
4351                                         pd2.proto = opt6.ip6e_nxt;
4352                                         /* goto the next header */
4353                                         break;
4354                                 }
4355                                 default:
4356                                         terminal++;
4357                                         break;
4358                                 }
4359                         } while (!terminal);
4360                         break;
4361 #endif /* INET6 */
4362                 }
4363
4364                 switch (pd2.proto) {
4365                 case IPPROTO_TCP: {
4366                         struct tcphdr            th;
4367                         u_int32_t                seq;
4368                         struct pf_state          key;
4369                         struct pf_state_peer    *src, *dst;
4370                         u_int8_t                 dws;
4371                         int                      copyback = 0;
4372
4373                         /*
4374                          * Only the first 8 bytes of the TCP header can be
4375                          * expected. Don't access any TCP header fields after
4376                          * th_seq, an ackskew test is not possible.
4377                          */
4378                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, NULL, pd2.af)) {
4379                                 DPFPRINTF(PF_DEBUG_MISC,
4380                                     ("pf: ICMP error message too short "
4381                                     "(tcp)\n"));
4382                                 return (PF_DROP);
4383                         }
4384
4385                         key.af = pd2.af;
4386                         key.proto = IPPROTO_TCP;
4387                         if (direction == PF_IN) {
4388                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4389                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4390                                 key.ext.port = th.th_dport;
4391                                 key.gwy.port = th.th_sport;
4392                         } else {
4393                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4394                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4395                                 key.lan.port = th.th_dport;
4396                                 key.ext.port = th.th_sport;
4397                         }
4398
4399                         STATE_LOOKUP();
4400
4401                         if (direction == (*state)->direction) {
4402                                 src = &(*state)->dst;
4403                                 dst = &(*state)->src;
4404                         } else {
4405                                 src = &(*state)->src;
4406                                 dst = &(*state)->dst;
4407                         }
4408
4409                         if (src->wscale && dst->wscale &&
4410                             !(th.th_flags & TH_SYN))
4411                                 dws = dst->wscale & PF_WSCALE_MASK;
4412                         else
4413                                 dws = 0;
4414
4415                         /* Demodulate sequence number */
4416                         seq = ntohl(th.th_seq) - src->seqdiff;
4417                         if (src->seqdiff) {
4418                                 pf_change_a(&th.th_seq, icmpsum,
4419                                     htonl(seq), 0);
4420                                 copyback = 1;
4421                         }
4422
4423                         if (!SEQ_GEQ(src->seqhi, seq) ||
4424                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
4425                                 if (pf_status.debug >= PF_DEBUG_MISC) {
4426                                         printf("pf: BAD ICMP %d:%d ",
4427                                             icmptype, pd->hdr.icmp->icmp_code);
4428                                         pf_print_host(pd->src, 0, pd->af);
4429                                         printf(" -> ");
4430                                         pf_print_host(pd->dst, 0, pd->af);
4431                                         printf(" state: ");
4432                                         pf_print_state(*state);
4433                                         printf(" seq=%u\n", seq);
4434                                 }
4435                                 return (PF_DROP);
4436                         }
4437
4438                         if (STATE_TRANSLATE(*state)) {
4439                                 if (direction == PF_IN) {
4440                                         pf_change_icmp(pd2.src, &th.th_sport,
4441                                             daddr, &(*state)->lan.addr,
4442                                             (*state)->lan.port, NULL,
4443                                             pd2.ip_sum, icmpsum,
4444                                             pd->ip_sum, 0, pd2.af);
4445                                 } else {
4446                                         pf_change_icmp(pd2.dst, &th.th_dport,
4447                                             saddr, &(*state)->gwy.addr,
4448                                             (*state)->gwy.port, NULL,
4449                                             pd2.ip_sum, icmpsum,
4450                                             pd->ip_sum, 0, pd2.af);
4451                                 }
4452                                 copyback = 1;
4453                         }
4454
4455                         if (copyback) {
4456                                 switch (pd2.af) {
4457 #ifdef INET
4458                                 case AF_INET:
4459                                         m_copyback(m, off, ICMP_MINLEN,
4460                                             (caddr_t)pd->hdr.icmp);
4461                                         m_copyback(m, ipoff2, sizeof(h2),
4462                                             (caddr_t)&h2);
4463                                         break;
4464 #endif /* INET */
4465 #ifdef INET6
4466                                 case AF_INET6:
4467                                         m_copyback(m, off,
4468                                             sizeof(struct icmp6_hdr),
4469                                             (caddr_t)pd->hdr.icmp6);
4470                                         m_copyback(m, ipoff2, sizeof(h2_6),
4471                                             (caddr_t)&h2_6);
4472                                         break;
4473 #endif /* INET6 */
4474                                 }
4475                                 m_copyback(m, off2, 8, (caddr_t)&th);
4476                         }
4477
4478                         return (PF_PASS);
4479                         break;
4480                 }
4481                 case IPPROTO_UDP: {
4482                         struct udphdr           uh;
4483                         struct pf_state         key;
4484
4485                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4486                             NULL, NULL, pd2.af)) {
4487                                 DPFPRINTF(PF_DEBUG_MISC,
4488                                     ("pf: ICMP error message too short "
4489                                     "(udp)\n"));
4490                                 return (PF_DROP);
4491                         }
4492
4493                         key.af = pd2.af;
4494                         key.proto = IPPROTO_UDP;
4495                         if (direction == PF_IN) {
4496                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4497                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4498                                 key.ext.port = uh.uh_dport;
4499                                 key.gwy.port = uh.uh_sport;
4500                         } else {
4501                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4502                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4503                                 key.lan.port = uh.uh_dport;
4504                                 key.ext.port = uh.uh_sport;
4505                         }
4506
4507                         STATE_LOOKUP();
4508
4509                         if (STATE_TRANSLATE(*state)) {
4510                                 if (direction == PF_IN) {
4511                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4512                                             daddr, &(*state)->lan.addr,
4513                                             (*state)->lan.port, &uh.uh_sum,
4514                                             pd2.ip_sum, icmpsum,
4515                                             pd->ip_sum, 1, pd2.af);
4516                                 } else {
4517                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4518                                             saddr, &(*state)->gwy.addr,
4519                                             (*state)->gwy.port, &uh.uh_sum,
4520                                             pd2.ip_sum, icmpsum,
4521                                             pd->ip_sum, 1, pd2.af);
4522                                 }
4523                                 switch (pd2.af) {
4524 #ifdef INET
4525                                 case AF_INET:
4526                                         m_copyback(m, off, ICMP_MINLEN,
4527                                             (caddr_t)pd->hdr.icmp);
4528                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4529                                         break;
4530 #endif /* INET */
4531 #ifdef INET6
4532                                 case AF_INET6:
4533                                         m_copyback(m, off,
4534                                             sizeof(struct icmp6_hdr),
4535                                             (caddr_t)pd->hdr.icmp6);
4536                                         m_copyback(m, ipoff2, sizeof(h2_6),
4537                                             (caddr_t)&h2_6);
4538                                         break;
4539 #endif /* INET6 */
4540                                 }
4541                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4542                         }
4543
4544                         return (PF_PASS);
4545                         break;
4546                 }
4547 #ifdef INET
4548                 case IPPROTO_ICMP: {
4549                         struct icmp             iih;
4550                         struct pf_state         key;
4551
4552                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4553                             NULL, NULL, pd2.af)) {
4554                                 DPFPRINTF(PF_DEBUG_MISC,
4555                                     ("pf: ICMP error message too short i"
4556                                     "(icmp)\n"));
4557                                 return (PF_DROP);
4558                         }
4559
4560                         key.af = pd2.af;
4561                         key.proto = IPPROTO_ICMP;
4562                         if (direction == PF_IN) {
4563                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4564                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4565                                 key.ext.port = iih.icmp_id;
4566                                 key.gwy.port = iih.icmp_id;
4567                         } else {
4568                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4569                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4570                                 key.lan.port = iih.icmp_id;
4571                                 key.ext.port = iih.icmp_id;
4572                         }
4573
4574                         STATE_LOOKUP();
4575
4576                         if (STATE_TRANSLATE(*state)) {
4577                                 if (direction == PF_IN) {
4578                                         pf_change_icmp(pd2.src, &iih.icmp_id,
4579                                             daddr, &(*state)->lan.addr,
4580                                             (*state)->lan.port, NULL,
4581                                             pd2.ip_sum, icmpsum,
4582                                             pd->ip_sum, 0, AF_INET);
4583                                 } else {
4584                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
4585                                             saddr, &(*state)->gwy.addr,
4586                                             (*state)->gwy.port, NULL,
4587                                             pd2.ip_sum, icmpsum,
4588                                             pd->ip_sum, 0, AF_INET);
4589                                 }
4590                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
4591                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4592                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
4593                         }
4594
4595                         return (PF_PASS);
4596                         break;
4597                 }
4598 #endif /* INET */
4599 #ifdef INET6
4600                 case IPPROTO_ICMPV6: {
4601                         struct icmp6_hdr        iih;
4602                         struct pf_state         key;
4603
4604                         if (!pf_pull_hdr(m, off2, &iih,
4605                             sizeof(struct icmp6_hdr), NULL, NULL, pd2.af)) {
4606                                 DPFPRINTF(PF_DEBUG_MISC,
4607                                     ("pf: ICMP error message too short "
4608                                     "(icmp6)\n"));
4609                                 return (PF_DROP);
4610                         }
4611
4612                         key.af = pd2.af;
4613                         key.proto = IPPROTO_ICMPV6;
4614                         if (direction == PF_IN) {
4615                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4616                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4617                                 key.ext.port = iih.icmp6_id;
4618                                 key.gwy.port = iih.icmp6_id;
4619                         } else {
4620                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4621                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4622                                 key.lan.port = iih.icmp6_id;
4623                                 key.ext.port = iih.icmp6_id;
4624                         }
4625
4626                         STATE_LOOKUP();
4627
4628                         if (STATE_TRANSLATE(*state)) {
4629                                 if (direction == PF_IN) {
4630                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
4631                                             daddr, &(*state)->lan.addr,
4632                                             (*state)->lan.port, NULL,
4633                                             pd2.ip_sum, icmpsum,
4634                                             pd->ip_sum, 0, AF_INET6);
4635                                 } else {
4636                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
4637                                             saddr, &(*state)->gwy.addr,
4638                                             (*state)->gwy.port, NULL,
4639                                             pd2.ip_sum, icmpsum,
4640                                             pd->ip_sum, 0, AF_INET6);
4641                                 }
4642                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4643                                     (caddr_t)pd->hdr.icmp6);
4644                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
4645                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
4646                                     (caddr_t)&iih);
4647                         }
4648
4649                         return (PF_PASS);
4650                         break;
4651                 }
4652 #endif /* INET6 */
4653                 default: {
4654                         struct pf_state         key;
4655
4656                         key.af = pd2.af;
4657                         key.proto = pd2.proto;
4658                         if (direction == PF_IN) {
4659                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4660                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4661                                 key.ext.port = 0;
4662                                 key.gwy.port = 0;
4663                         } else {
4664                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4665                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4666                                 key.lan.port = 0;
4667                                 key.ext.port = 0;
4668                         }
4669
4670                         STATE_LOOKUP();
4671
4672                         if (STATE_TRANSLATE(*state)) {
4673                                 if (direction == PF_IN) {
4674                                         pf_change_icmp(pd2.src, NULL,
4675                                             daddr, &(*state)->lan.addr,
4676                                             0, NULL,
4677                                             pd2.ip_sum, icmpsum,
4678                                             pd->ip_sum, 0, pd2.af);
4679                                 } else {
4680                                         pf_change_icmp(pd2.dst, NULL,
4681                                             saddr, &(*state)->gwy.addr,
4682                                             0, NULL,
4683                                             pd2.ip_sum, icmpsum,
4684                                             pd->ip_sum, 0, pd2.af);
4685                                 }
4686                                 switch (pd2.af) {
4687 #ifdef INET
4688                                 case AF_INET:
4689                                         m_copyback(m, off, ICMP_MINLEN,
4690                                             (caddr_t)pd->hdr.icmp);
4691                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4692                                         break;
4693 #endif /* INET */
4694 #ifdef INET6
4695                                 case AF_INET6:
4696                                         m_copyback(m, off,
4697                                             sizeof(struct icmp6_hdr),
4698                                             (caddr_t)pd->hdr.icmp6);
4699                                         m_copyback(m, ipoff2, sizeof(h2_6),
4700                                             (caddr_t)&h2_6);
4701                                         break;
4702 #endif /* INET6 */
4703                                 }
4704                         }
4705
4706                         return (PF_PASS);
4707                         break;
4708                 }
4709                 }
4710         }
4711 }
4712
4713 int
4714 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
4715     struct pf_pdesc *pd)
4716 {
4717         struct pf_state_peer    *src, *dst;
4718         struct pf_state          key;
4719
4720         key.af = pd->af;
4721         key.proto = pd->proto;
4722         if (direction == PF_IN) {
4723                 PF_ACPY(&key.ext.addr, pd->src, key.af);
4724                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4725                 key.ext.port = 0;
4726                 key.gwy.port = 0;
4727         } else {
4728                 PF_ACPY(&key.lan.addr, pd->src, key.af);
4729                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4730                 key.lan.port = 0;
4731                 key.ext.port = 0;
4732         }
4733
4734         STATE_LOOKUP();
4735
4736         if (direction == (*state)->direction) {
4737                 src = &(*state)->src;
4738                 dst = &(*state)->dst;
4739         } else {
4740                 src = &(*state)->dst;
4741                 dst = &(*state)->src;
4742         }
4743
4744         /* update states */
4745         if (src->state < PFOTHERS_SINGLE)
4746                 src->state = PFOTHERS_SINGLE;
4747         if (dst->state == PFOTHERS_SINGLE)
4748                 dst->state = PFOTHERS_MULTIPLE;
4749
4750         /* update expire time */
4751         (*state)->expire = time_second;
4752         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
4753                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
4754         else
4755                 (*state)->timeout = PFTM_OTHER_SINGLE;
4756
4757         /* translate source/destination address, if necessary */
4758         if (STATE_TRANSLATE(*state)) {
4759                 if (direction == PF_OUT)
4760                         switch (pd->af) {
4761 #ifdef INET
4762                         case AF_INET:
4763                                 pf_change_a(&pd->src->v4.s_addr,
4764                                     pd->ip_sum, (*state)->gwy.addr.v4.s_addr,
4765                                     0);
4766                                 break;
4767 #endif /* INET */
4768 #ifdef INET6
4769                         case AF_INET6:
4770                                 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af);
4771                                 break;
4772 #endif /* INET6 */
4773                         }
4774                 else
4775                         switch (pd->af) {
4776 #ifdef INET
4777                         case AF_INET:
4778                                 pf_change_a(&pd->dst->v4.s_addr,
4779                                     pd->ip_sum, (*state)->lan.addr.v4.s_addr,
4780                                     0);
4781                                 break;
4782 #endif /* INET */
4783 #ifdef INET6
4784                         case AF_INET6:
4785                                 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af);
4786                                 break;
4787 #endif /* INET6 */
4788                         }
4789         }
4790
4791         return (PF_PASS);
4792 }
4793
4794 /*
4795  * ipoff and off are measured from the start of the mbuf chain.
4796  * h must be at "ipoff" on the mbuf chain.
4797  */
4798 void *
4799 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
4800     u_short *actionp, u_short *reasonp, sa_family_t af)
4801 {
4802         switch (af) {
4803 #ifdef INET
4804         case AF_INET: {
4805                 struct ip       *h = mtod(m, struct ip *);
4806                 u_int16_t        fragoff = (h->ip_off & IP_OFFMASK) << 3;
4807
4808                 if (fragoff) {
4809                         if (fragoff >= len)
4810                                 ACTION_SET(actionp, PF_PASS);
4811                         else {
4812                                 ACTION_SET(actionp, PF_DROP);
4813                                 REASON_SET(reasonp, PFRES_FRAG);
4814                         }
4815                         return (NULL);
4816                 }
4817                 if (m->m_pkthdr.len < off + len ||
4818                     h->ip_len < off + len) {
4819                         ACTION_SET(actionp, PF_DROP);
4820                         REASON_SET(reasonp, PFRES_SHORT);
4821                         return (NULL);
4822                 }
4823                 break;
4824         }
4825 #endif /* INET */
4826 #ifdef INET6
4827         case AF_INET6: {
4828                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
4829
4830                 if (m->m_pkthdr.len < off + len ||
4831                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
4832                     (unsigned)(off + len)) {
4833                         ACTION_SET(actionp, PF_DROP);
4834                         REASON_SET(reasonp, PFRES_SHORT);
4835                         return (NULL);
4836                 }
4837                 break;
4838         }
4839 #endif /* INET6 */
4840         }
4841         m_copydata(m, off, len, p);
4842         return (p);
4843 }
4844
4845 int
4846 pf_routable(struct pf_addr *addr, sa_family_t af)
4847 {
4848         struct sockaddr_in      *dst;
4849         struct route             ro;
4850         int                      ret = 0;
4851
4852         bzero(&ro, sizeof(ro));
4853         dst = satosin(&ro.ro_dst);
4854         dst->sin_family = af;
4855         dst->sin_len = sizeof(*dst);
4856         dst->sin_addr = addr->v4;
4857         rtalloc_ign(&ro, (RTF_CLONING|RTF_PRCLONING));
4858
4859         if (ro.ro_rt != NULL) {
4860                 ret = 1;
4861                 RTFREE(ro.ro_rt);
4862         }
4863
4864         return (ret);
4865 }
4866
4867 #ifdef INET
4868 void
4869 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
4870     struct pf_state *s)
4871 {
4872         struct mbuf             *m0, *m1;
4873         struct route             iproute;
4874         struct route            *ro = NULL;
4875         struct sockaddr_in      *dst;
4876         struct ip               *ip;
4877         struct ifnet            *ifp = NULL;
4878         struct pf_addr           naddr;
4879         struct pf_src_node      *sn = NULL;
4880         int                      error = 0;
4881         int sw_csum;
4882
4883         if (m == NULL || *m == NULL || r == NULL ||
4884             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
4885                 panic("pf_route: invalid parameters");
4886
4887         if (((*m)->m_pkthdr.pf_flags & PF_MBUF_ROUTED) == 0) {
4888                 (*m)->m_pkthdr.pf_flags |= PF_MBUF_ROUTED;
4889                 (*m)->m_pkthdr.pf_routed = 1;
4890         } else {
4891                 if ((*m)->m_pkthdr.pf_routed > 3) {
4892                         m0 = *m;
4893                         *m = NULL;
4894                         goto bad;
4895                 }
4896                 (*m)->m_pkthdr.pf_routed++;
4897         }
4898
4899         if (r->rt == PF_DUPTO) {
4900                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
4901                         return;
4902         } else {
4903                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
4904                         return;
4905                 m0 = *m;
4906         }
4907
4908         if (m0->m_len < sizeof(struct ip))
4909                 panic("pf_route: m0->m_len < sizeof(struct ip)");
4910         ip = mtod(m0, struct ip *);
4911
4912         ro = &iproute;
4913         bzero((caddr_t)ro, sizeof(*ro));
4914         dst = satosin(&ro->ro_dst);
4915         dst->sin_family = AF_INET;
4916         dst->sin_len = sizeof(*dst);
4917         dst->sin_addr = ip->ip_dst;
4918
4919         if (r->rt == PF_FASTROUTE) {
4920                 rtalloc(ro);
4921                 if (ro->ro_rt == 0) {
4922                         ipstat.ips_noroute++;
4923                         goto bad;
4924                 }
4925
4926                 ifp = ro->ro_rt->rt_ifp;
4927                 ro->ro_rt->rt_use++;
4928
4929                 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
4930                         dst = satosin(ro->ro_rt->rt_gateway);
4931         } else {
4932                 if (TAILQ_EMPTY(&r->rpool.list))
4933                         panic("pf_route: TAILQ_EMPTY(&r->rpool.list)");
4934                 if (s == NULL) {
4935                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
4936                             &naddr, NULL, &sn);
4937                         if (!PF_AZERO(&naddr, AF_INET))
4938                                 dst->sin_addr.s_addr = naddr.v4.s_addr;
4939                         ifp = r->rpool.cur->kif ?
4940                             r->rpool.cur->kif->pfik_ifp : NULL;
4941                 } else {
4942                         if (!PF_AZERO(&s->rt_addr, AF_INET))
4943                                 dst->sin_addr.s_addr =
4944                                     s->rt_addr.v4.s_addr;
4945                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
4946                 }
4947         }
4948         if (ifp == NULL)
4949                 goto bad;
4950
4951         if (oifp != ifp) {
4952                 if (pf_test(PF_OUT, ifp, &m0) != PF_PASS)
4953                         goto bad;
4954                 else if (m0 == NULL)
4955                         goto done;
4956                 if (m0->m_len < sizeof(struct ip))
4957                         panic("pf_route: m0->m_len < sizeof(struct ip)");
4958                 ip = mtod(m0, struct ip *);
4959         }
4960
4961         /* Copied from ip_output. */
4962         m0->m_pkthdr.csum_flags |= CSUM_IP;
4963         sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
4964         if (sw_csum & CSUM_DELAY_DATA) {
4965                 in_delayed_cksum(m0);
4966                 sw_csum &= ~CSUM_DELAY_DATA;
4967         }
4968         m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
4969
4970         /*
4971          * If small enough for interface, or the interface will take
4972          * care of the fragmentation for us, can just send directly.
4973          */
4974         if (ip->ip_len <= ifp->if_mtu || ((ifp->if_hwassist & CSUM_FRAGMENT) &&
4975                 (ip->ip_off & IP_DF) == 0)) {
4976                 ip->ip_len = htons(ip->ip_len);
4977                 ip->ip_off = htons(ip->ip_off);
4978                 ip->ip_sum = 0;
4979                 if (sw_csum & CSUM_DELAY_IP) {
4980                         /* From KAME */
4981                         if (ip->ip_v == IPVERSION &&
4982                             (ip->ip_hl << 2) == sizeof(*ip)) {
4983                                 ip->ip_sum = in_cksum_hdr(ip);
4984                         } else {
4985                                 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
4986                         }
4987                 }
4988
4989                 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt);
4990                 goto done;
4991         }
4992
4993         /*
4994          * Too large for interface; fragment if possible.
4995          * Must be able to put at least 8 bytes per fragment.
4996          */
4997         if (ip->ip_off & IP_DF) {
4998                 ipstat.ips_cantfrag++;
4999                 if (r->rt != PF_DUPTO) {
5000                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5001                             ifp);
5002                         goto done;
5003                 } else
5004                         goto bad;
5005         }
5006
5007         m1 = m0;
5008         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5009         if (error)
5010                 goto bad;
5011
5012         for (m0 = m1; m0; m0 = m1) {
5013                 m1 = m0->m_nextpkt;
5014                 m0->m_nextpkt = 0;
5015                 if (error == 0)
5016                         error = (*ifp->if_output)(ifp, m0, sintosa(dst),
5017                             NULL);
5018                 else
5019                         m_freem(m0);
5020         }
5021
5022         if (error == 0)
5023                 ipstat.ips_fragmented++;
5024
5025 done:
5026         if (r->rt != PF_DUPTO)
5027                 *m = NULL;
5028         if (ro == &iproute && ro->ro_rt)
5029                 RTFREE(ro->ro_rt);
5030         return;
5031
5032 bad:
5033         m_freem(m0);
5034         goto done;
5035 }
5036 #endif /* INET */
5037
5038 #ifdef INET6
5039 void
5040 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5041     struct pf_state *s)
5042 {
5043         struct mbuf             *m0;
5044         struct route_in6         ip6route;
5045         struct route_in6        *ro;
5046         struct sockaddr_in6     *dst;
5047         struct ip6_hdr          *ip6;
5048         struct ifnet            *ifp = NULL;
5049         struct pf_addr           naddr;
5050         struct pf_src_node      *sn = NULL;
5051         int                      error = 0;
5052
5053         if (m == NULL || *m == NULL || r == NULL ||
5054             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5055                 panic("pf_route6: invalid parameters");
5056
5057         if (((*m)->m_pkthdr.pf_flags & PF_MBUF_ROUTED) == 0) {
5058                 (*m)->m_pkthdr.pf_flags |= PF_MBUF_ROUTED;
5059                 (*m)->m_pkthdr.pf_routed = 1;
5060         } else {
5061                 if ((*m)->m_pkthdr.pf_routed > 3) {
5062                         m0 = *m;
5063                         *m = NULL;
5064                         goto bad;
5065                 }
5066                 (*m)->m_pkthdr.pf_routed++;
5067         }
5068
5069         if (r->rt == PF_DUPTO) {
5070                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5071                         return;
5072         } else {
5073                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5074                         return;
5075                 m0 = *m;
5076         }
5077
5078         if (m0->m_len < sizeof(struct ip6_hdr))
5079                 panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5080         ip6 = mtod(m0, struct ip6_hdr *);
5081
5082         ro = &ip6route;
5083         bzero((caddr_t)ro, sizeof(*ro));
5084         dst = (struct sockaddr_in6 *)&ro->ro_dst;
5085         dst->sin6_family = AF_INET6;
5086         dst->sin6_len = sizeof(*dst);
5087         dst->sin6_addr = ip6->ip6_dst;
5088
5089         /* Cheat. */
5090         if (r->rt == PF_FASTROUTE) {
5091                 m0->m_pkthdr.pf_flags |= PF_MBUF_GENERATED;
5092                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5093                 return;
5094         }
5095
5096         if (TAILQ_EMPTY(&r->rpool.list))
5097                 panic("pf_route6: TAILQ_EMPTY(&r->rpool.list)");
5098         if (s == NULL) {
5099                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5100                     &naddr, NULL, &sn);
5101                 if (!PF_AZERO(&naddr, AF_INET6))
5102                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5103                             &naddr, AF_INET6);
5104                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5105         } else {
5106                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5107                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5108                             &s->rt_addr, AF_INET6);
5109                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5110         }
5111         if (ifp == NULL)
5112                 goto bad;
5113
5114         if (oifp != ifp) {
5115                 if (pf_test6(PF_OUT, ifp, &m0) != PF_PASS)
5116                         goto bad;
5117                 else if (m0 == NULL)
5118                         goto done;
5119                 if (m0->m_len < sizeof(struct ip6_hdr))
5120                         panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5121                 ip6 = mtod(m0, struct ip6_hdr *);
5122         }
5123
5124         /*
5125          * If the packet is too large for the outgoing interface,
5126          * send back an icmp6 error.
5127          */
5128         if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5129                 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5130         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5131                 error = nd6_output(ifp, ifp, m0, dst, NULL);
5132         } else {
5133                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5134                 if (r->rt != PF_DUPTO)
5135                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5136                 else
5137                         goto bad;
5138         }
5139
5140 done:
5141         if (r->rt != PF_DUPTO)
5142                 *m = NULL;
5143         return;
5144
5145 bad:
5146         m_freem(m0);
5147         goto done;
5148 }
5149 #endif /* INET6 */
5150
5151
5152 /*
5153  * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5154  *   off is the offset where the protocol header starts
5155  *   len is the total length of protocol header plus payload
5156  * returns 0 when the checksum is valid, otherwise returns 1.
5157  */
5158 /*
5159  * XXX
5160  * FreeBSD supports cksum offload for the following drivers.
5161  * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5162  * If we can make full use of it we would outperform ipfw/ipfilter in
5163  * very heavy traffic.
5164  * I have not tested 'cause I don't have NICs that supports cksum offload.
5165  * (There might be problems. Typical phenomena would be
5166  *   1. No route message for UDP packet.
5167  *   2. No connection acceptance from external hosts regardless of rule set.)
5168  */
5169 int
5170 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5171     sa_family_t af)
5172 {
5173         u_int16_t sum = 0;
5174         int hw_assist = 0;
5175         struct ip *ip;
5176
5177         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5178                 return (1);
5179         if (m->m_pkthdr.len < off + len)
5180                 return (1);
5181
5182         switch (p) {
5183         case IPPROTO_TCP:
5184         case IPPROTO_UDP:
5185                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5186                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5187                                 sum = m->m_pkthdr.csum_data;
5188                         } else {
5189                                 ip = mtod(m, struct ip *);
5190                                 sum = in_pseudo(ip->ip_src.s_addr,
5191                                         ip->ip_dst.s_addr, htonl((u_short)len +
5192                                         m->m_pkthdr.csum_data + p));
5193                         }
5194                         sum ^= 0xffff;
5195                         ++hw_assist;
5196                 }
5197                 break;
5198         case IPPROTO_ICMP:
5199 #ifdef INET6
5200         case IPPROTO_ICMPV6:
5201 #endif /* INET6 */
5202                 break;
5203         default:
5204                 return (1);
5205         }
5206
5207         if (!hw_assist) {
5208                 switch (af) {
5209                 case AF_INET:
5210                         if (p == IPPROTO_ICMP) {
5211                                 if (m->m_len < off)
5212                                         return (1);
5213                                 m->m_data += off;
5214                                 m->m_len -= off;
5215                                 sum = in_cksum(m, len);
5216                                 m->m_data -= off;
5217                                 m->m_len += off;
5218                         } else {
5219                                 if (m->m_len < sizeof(struct ip))
5220                                         return (1);
5221                                 sum = in_cksum_range(m, p, off, len);
5222                                 if (sum == 0) {
5223                                         m->m_pkthdr.csum_flags |=
5224                                             (CSUM_DATA_VALID |
5225                                              CSUM_PSEUDO_HDR);
5226                                         m->m_pkthdr.csum_data = 0xffff;
5227                                 }
5228                         }
5229                         break;
5230 #ifdef INET6
5231                 case AF_INET6:
5232                         if (m->m_len < sizeof(struct ip6_hdr))
5233                                 return (1);
5234                         sum = in6_cksum(m, p, off, len);
5235                         /*
5236                          * XXX
5237                          * IPv6 H/W cksum off-load not supported yet!
5238                          *
5239                          * if (sum == 0) {
5240                          *      m->m_pkthdr.csum_flags |=
5241                          *          (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5242                          *      m->m_pkthdr.csum_data = 0xffff;
5243                          *}
5244                          */
5245                         break;
5246 #endif /* INET6 */
5247                 default:
5248                         return (1);
5249                 }
5250         }
5251         if (sum) {
5252                 switch (p) {
5253                 case IPPROTO_TCP:
5254                         tcpstat.tcps_rcvbadsum++;
5255                         break;
5256                 case IPPROTO_UDP:
5257                         udpstat.udps_badsum++;
5258                         break;
5259                 case IPPROTO_ICMP:
5260                         icmpstat.icps_checksum++;
5261                         break;
5262 #ifdef INET6
5263                 case IPPROTO_ICMPV6:
5264                         icmp6stat.icp6s_checksum++;
5265                         break;
5266 #endif /* INET6 */
5267                 }
5268                 return (1);
5269         }
5270         return (0);
5271 }
5272
5273 #ifdef INET
5274 int
5275 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0)
5276 {
5277         struct pfi_kif          *kif;
5278         u_short                  action, reason = 0, log = 0;
5279         struct mbuf             *m = *m0;
5280         struct ip               *h = NULL;
5281         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5282         struct pf_state         *s = NULL;
5283         struct pf_ruleset       *ruleset = NULL;
5284         struct pf_pdesc          pd;
5285         int                      off, dirndx, pqid = 0;
5286
5287         if (!pf_status.running || (m->m_pkthdr.pf_flags & PF_MBUF_GENERATED))
5288                 return (PF_PASS);
5289
5290         kif = pfi_index2kif[ifp->if_index];
5291         if (kif == NULL)
5292                 return (PF_DROP);
5293
5294 #ifdef DIAGNOSTIC
5295         if ((m->m_flags & M_PKTHDR) == 0)
5296                 panic("non-M_PKTHDR is passed to pf_test");
5297 #endif
5298
5299         memset(&pd, 0, sizeof(pd));
5300         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5301                 action = PF_DROP;
5302                 REASON_SET(&reason, PFRES_SHORT);
5303                 log = 1;
5304                 goto done;
5305         }
5306
5307         /* We do IP header normalization and packet reassembly here */
5308         if (pf_normalize_ip(m0, dir, kif, &reason) != PF_PASS) {
5309                 action = PF_DROP;
5310                 goto done;
5311         }
5312         m = *m0;
5313         h = mtod(m, struct ip *);
5314
5315         off = h->ip_hl << 2;
5316         if (off < (int)sizeof(*h)) {
5317                 action = PF_DROP;
5318                 REASON_SET(&reason, PFRES_SHORT);
5319                 log = 1;
5320                 goto done;
5321         }
5322
5323         pd.src = (struct pf_addr *)&h->ip_src;
5324         pd.dst = (struct pf_addr *)&h->ip_dst;
5325         PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
5326         pd.ip_sum = &h->ip_sum;
5327         pd.proto = h->ip_p;
5328         pd.af = AF_INET;
5329         pd.tos = h->ip_tos;
5330         pd.tot_len = h->ip_len;
5331
5332         /* handle fragments that didn't get reassembled by normalization */
5333         if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5334                 action = pf_test_fragment(&r, dir, kif, m, h,
5335                     &pd, &a, &ruleset);
5336                 goto done;
5337         }
5338
5339         switch (h->ip_p) {
5340
5341         case IPPROTO_TCP: {
5342                 struct tcphdr   th;
5343
5344                 pd.hdr.tcp = &th;
5345                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5346                     &action, &reason, AF_INET)) {
5347                         log = action != PF_PASS;
5348                         goto done;
5349                 }
5350                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5351                     h->ip_len - off, IPPROTO_TCP, AF_INET)) {
5352                         action = PF_DROP;
5353                         goto done;
5354                 }
5355                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5356                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5357                         pqid = 1;
5358                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5359                 if (action == PF_DROP)
5360                         goto done;
5361                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5362                     &reason);
5363                 if (action == PF_PASS) {
5364 #if NPFSYNC
5365                         pfsync_update_state(s);
5366 #endif
5367                         r = s->rule.ptr;
5368                         a = s->anchor.ptr;
5369                         log = s->log;
5370                 } else if (s == NULL)
5371                         action = pf_test_tcp(&r, &s, dir, kif,
5372                             m, off, h, &pd, &a, &ruleset);
5373                 break;
5374         }
5375
5376         case IPPROTO_UDP: {
5377                 struct udphdr   uh;
5378
5379                 pd.hdr.udp = &uh;
5380                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5381                     &action, &reason, AF_INET)) {
5382                         log = action != PF_PASS;
5383                         goto done;
5384                 }
5385                 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5386                     off, h->ip_len - off, IPPROTO_UDP, AF_INET)) {
5387                         action = PF_DROP;
5388                         goto done;
5389                 }
5390                 if (uh.uh_dport == 0 ||
5391                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5392                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5393                         action = PF_DROP;
5394                         goto done;
5395                 }
5396                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5397                 if (action == PF_PASS) {
5398 #if NPFSYNC
5399                         pfsync_update_state(s);
5400 #endif
5401                         r = s->rule.ptr;
5402                         a = s->anchor.ptr;
5403                         log = s->log;
5404                 } else if (s == NULL)
5405                         action = pf_test_udp(&r, &s, dir, kif,
5406                             m, off, h, &pd, &a, &ruleset);
5407                 break;
5408         }
5409
5410         case IPPROTO_ICMP: {
5411                 struct icmp     ih;
5412
5413                 pd.hdr.icmp = &ih;
5414                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5415                     &action, &reason, AF_INET)) {
5416                         log = action != PF_PASS;
5417                         goto done;
5418                 }
5419                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5420                     h->ip_len - off, IPPROTO_ICMP, AF_INET)) {
5421                         action = PF_DROP;
5422                         goto done;
5423                 }
5424                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd);
5425                 if (action == PF_PASS) {
5426 #if NPFSYNC
5427                         pfsync_update_state(s);
5428 #endif
5429                         r = s->rule.ptr;
5430                         a = s->anchor.ptr;
5431                         log = s->log;
5432                 } else if (s == NULL)
5433                         action = pf_test_icmp(&r, &s, dir, kif,
5434                             m, off, h, &pd, &a, &ruleset);
5435                 break;
5436         }
5437
5438         default:
5439                 action = pf_test_state_other(&s, dir, kif, &pd);
5440                 if (action == PF_PASS) {
5441 #if NPFSYNC
5442                         pfsync_update_state(s);
5443 #endif
5444                         r = s->rule.ptr;
5445                         a = s->anchor.ptr;
5446                         log = s->log;
5447                 } else if (s == NULL)
5448                         action = pf_test_other(&r, &s, dir, kif, m, off, h,
5449                             &pd, &a, &ruleset);
5450                 break;
5451         }
5452
5453 done:
5454         if (action == PF_PASS && h->ip_hl > 5 &&
5455             !((s && s->allow_opts) || r->allow_opts)) {
5456                 action = PF_DROP;
5457                 REASON_SET(&reason, PFRES_SHORT);
5458                 log = 1;
5459                 DPFPRINTF(PF_DEBUG_MISC,
5460                     ("pf: dropping packet with ip options\n"));
5461         }
5462
5463 #ifdef ALTQ
5464         if (action == PF_PASS && r->qid) {
5465                 struct m_tag    *mtag;
5466                 struct altq_tag *atag;
5467
5468                 mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), MB_DONTWAIT);
5469                 if (mtag != NULL) {
5470                         atag = (struct altq_tag *)(mtag + 1);
5471                         if (pqid || pd.tos == IPTOS_LOWDELAY)
5472                                 atag->qid = r->pqid;
5473                         else
5474                                 atag->qid = r->qid;
5475                         /* add hints for ecn */
5476                         atag->af = AF_INET;
5477                         atag->hdr = h;
5478                         m_tag_prepend(m, mtag);
5479                 }
5480         }
5481 #endif
5482
5483         /*
5484          * connections redirected to loopback should not match sockets
5485          * bound specifically to loopback due to security implications,
5486          * see tcp_input() and in_pcblookup_listen().
5487          */
5488         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5489             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5490             (s->nat_rule.ptr->action == PF_RDR ||
5491             s->nat_rule.ptr->action == PF_BINAT) &&
5492             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
5493                 action = PF_DROP;
5494                 REASON_SET(&reason, PFRES_MEMORY);
5495         }
5496
5497         m->m_pkthdr.pf_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5498
5499         if (log)
5500                 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset);
5501
5502         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5503         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
5504
5505         if (action == PF_PASS || r->action == PF_DROP) {
5506                 r->packets++;
5507                 r->bytes += pd.tot_len;
5508                 if (a != NULL) {
5509                         a->packets++;
5510                         a->bytes += pd.tot_len;
5511                 }
5512                 if (s != NULL) {
5513                         dirndx = (dir == s->direction) ? 0 : 1;
5514                         s->packets[dirndx]++;
5515                         s->bytes[dirndx] += pd.tot_len;
5516                         if (s->nat_rule.ptr != NULL) {
5517                                 s->nat_rule.ptr->packets++;
5518                                 s->nat_rule.ptr->bytes += pd.tot_len;
5519                         }
5520                         if (s->src_node != NULL) {
5521                                 s->src_node->packets++;
5522                                 s->src_node->bytes += pd.tot_len;
5523                         }
5524                         if (s->nat_src_node != NULL) {
5525                                 s->nat_src_node->packets++;
5526                                 s->nat_src_node->bytes += pd.tot_len;
5527                         }
5528                 }
5529                 tr = r;
5530                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5531                 if (nr != NULL) {
5532                         struct pf_addr *x;
5533                         /*
5534                          * XXX: we need to make sure that the addresses
5535                          * passed to pfr_update_stats() are the same than
5536                          * the addresses used during matching (pfr_match)
5537                          */
5538                         if (r == &pf_default_rule) {
5539                                 tr = nr;
5540                                 x = (s == NULL || s->direction == dir) ?
5541                                     &pd.baddr : &pd.naddr;
5542                         } else
5543                                 x = (s == NULL || s->direction == dir) ?
5544                                     &pd.naddr : &pd.baddr;
5545                         if (x == &pd.baddr || s == NULL) {
5546                                 /* we need to change the address */
5547                                 if (dir == PF_OUT)
5548                                         pd.src = x;
5549                                 else
5550                                         pd.dst = x;
5551                         }
5552                 }
5553                 if (tr->src.addr.type == PF_ADDR_TABLE)
5554                         pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5555                             s->direction == dir) ? pd.src : pd.dst, pd.af,
5556                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5557                             tr->src.not);
5558                 if (tr->dst.addr.type == PF_ADDR_TABLE)
5559                         pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5560                             s->direction == dir) ? pd.dst : pd.src, pd.af,
5561                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5562                             tr->dst.not);
5563         }
5564
5565
5566         if (action == PF_SYNPROXY_DROP) {
5567                 m_freem(*m0);
5568                 *m0 = NULL;
5569                 action = PF_PASS;
5570         } else if (r->rt)
5571                 /* pf_route can free the mbuf causing *m0 to become NULL */
5572                 pf_route(m0, r, dir, ifp, s);
5573
5574         return (action);
5575 }
5576 #endif /* INET */
5577
5578 #ifdef INET6
5579 int
5580 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0)
5581 {
5582         struct pfi_kif          *kif;
5583         u_short                  action, reason = 0, log = 0;
5584         struct mbuf             *m = *m0;
5585         struct ip6_hdr          *h;
5586         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5587         struct pf_state         *s = NULL;
5588         struct pf_ruleset       *ruleset = NULL;
5589         struct pf_pdesc          pd;
5590         int                      off, terminal = 0, dirndx;
5591
5592         if (!pf_status.running || (m->m_pkthdr.pf_flags & PF_MBUF_GENERATED))
5593                 return (PF_PASS);
5594
5595         kif = pfi_index2kif[ifp->if_index];
5596         if (kif == NULL)
5597                 return (PF_DROP);
5598
5599 #ifdef DIAGNOSTIC
5600         if ((m->m_flags & M_PKTHDR) == 0)
5601                 panic("non-M_PKTHDR is passed to pf_test");
5602 #endif
5603
5604         memset(&pd, 0, sizeof(pd));
5605         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5606                 action = PF_DROP;
5607                 REASON_SET(&reason, PFRES_SHORT);
5608                 log = 1;
5609                 goto done;
5610         }
5611
5612         /* We do IP header normalization and packet reassembly here */
5613         if (pf_normalize_ip6(m0, dir, kif, &reason) != PF_PASS) {
5614                 action = PF_DROP;
5615                 goto done;
5616         }
5617         m = *m0;
5618         h = mtod(m, struct ip6_hdr *);
5619
5620         pd.src = (struct pf_addr *)&h->ip6_src;
5621         pd.dst = (struct pf_addr *)&h->ip6_dst;
5622         PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
5623         pd.ip_sum = NULL;
5624         pd.af = AF_INET6;
5625         pd.tos = 0;
5626         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
5627
5628         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
5629         pd.proto = h->ip6_nxt;
5630         do {
5631                 switch (pd.proto) {
5632                 case IPPROTO_FRAGMENT:
5633                         action = pf_test_fragment(&r, dir, kif, m, h,
5634                             &pd, &a, &ruleset);
5635                         if (action == PF_DROP)
5636                                 REASON_SET(&reason, PFRES_FRAG);
5637                         goto done;
5638                 case IPPROTO_AH:
5639                 case IPPROTO_HOPOPTS:
5640                 case IPPROTO_ROUTING:
5641                 case IPPROTO_DSTOPTS: {
5642                         /* get next header and header length */
5643                         struct ip6_ext  opt6;
5644
5645                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
5646                             NULL, NULL, pd.af)) {
5647                                 DPFPRINTF(PF_DEBUG_MISC,
5648                                     ("pf: IPv6 short opt\n"));
5649                                 action = PF_DROP;
5650                                 REASON_SET(&reason, PFRES_SHORT);
5651                                 log = 1;
5652                                 goto done;
5653                         }
5654                         if (pd.proto == IPPROTO_AH)
5655                                 off += (opt6.ip6e_len + 2) * 4;
5656                         else
5657                                 off += (opt6.ip6e_len + 1) * 8;
5658                         pd.proto = opt6.ip6e_nxt;
5659                         /* goto the next header */
5660                         break;
5661                 }
5662                 default:
5663                         terminal++;
5664                         break;
5665                 }
5666         } while (!terminal);
5667
5668         switch (pd.proto) {
5669
5670         case IPPROTO_TCP: {
5671                 struct tcphdr   th;
5672
5673                 pd.hdr.tcp = &th;
5674                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5675                     &action, &reason, AF_INET6)) {
5676                         log = action != PF_PASS;
5677                         goto done;
5678                 }
5679                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5680                     ntohs(h->ip6_plen), IPPROTO_TCP, AF_INET6)) {
5681                         action = PF_DROP;
5682                         goto done;
5683                 }
5684                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5685                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5686                 if (action == PF_DROP)
5687                         goto done;
5688                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5689                     &reason);
5690                 if (action == PF_PASS) {
5691 #if NPFSYNC
5692                         pfsync_update_state(s);
5693 #endif
5694                         r = s->rule.ptr;
5695                         a = s->anchor.ptr;
5696                         log = s->log;
5697                 } else if (s == NULL)
5698                         action = pf_test_tcp(&r, &s, dir, kif,
5699                             m, off, h, &pd, &a, &ruleset);
5700                 break;
5701         }
5702
5703         case IPPROTO_UDP: {
5704                 struct udphdr   uh;
5705
5706                 pd.hdr.udp = &uh;
5707                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5708                     &action, &reason, AF_INET6)) {
5709                         log = action != PF_PASS;
5710                         goto done;
5711                 }
5712                 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5713                     off, ntohs(h->ip6_plen), IPPROTO_UDP, AF_INET6)) {
5714                         action = PF_DROP;
5715                         goto done;
5716                 }
5717                 if (uh.uh_dport == 0 ||
5718                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5719                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5720                         action = PF_DROP;
5721                         goto done;
5722                 }
5723                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5724                 if (action == PF_PASS) {
5725 #if NPFSYNC
5726                         pfsync_update_state(s);
5727 #endif
5728                         r = s->rule.ptr;
5729                         a = s->anchor.ptr;
5730                         log = s->log;
5731                 } else if (s == NULL)
5732                         action = pf_test_udp(&r, &s, dir, kif,
5733                             m, off, h, &pd, &a, &ruleset);
5734                 break;
5735         }
5736
5737         case IPPROTO_ICMPV6: {
5738                 struct icmp6_hdr        ih;
5739
5740                 pd.hdr.icmp6 = &ih;
5741                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
5742                     &action, &reason, AF_INET6)) {
5743                         log = action != PF_PASS;
5744                         goto done;
5745                 }
5746                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5747                     ntohs(h->ip6_plen), IPPROTO_ICMPV6, AF_INET6)) {
5748                         action = PF_DROP;
5749                         goto done;
5750                 }
5751                 action = pf_test_state_icmp(&s, dir, kif,
5752                     m, off, h, &pd);
5753                 if (action == PF_PASS) {
5754 #if NPFSYNC
5755                         pfsync_update_state(s);
5756 #endif
5757                         r = s->rule.ptr;
5758                         a = s->anchor.ptr;
5759                         log = s->log;
5760                 } else if (s == NULL)
5761                         action = pf_test_icmp(&r, &s, dir, kif,
5762                             m, off, h, &pd, &a, &ruleset);
5763                 break;
5764         }
5765
5766         default:
5767                 action = pf_test_state_other(&s, dir, kif, &pd);
5768                 if (action == PF_PASS) {
5769                         r = s->rule.ptr;
5770                         a = s->anchor.ptr;
5771                         log = s->log;
5772                 } else if (s == NULL)
5773                         action = pf_test_other(&r, &s, dir, kif, m, off, h,
5774                             &pd, &a, &ruleset);
5775                 break;
5776         }
5777
5778 done:
5779         /* XXX handle IPv6 options, if not allowed. not implemented. */
5780
5781 #ifdef ALTQ
5782         if (action == PF_PASS && r->qid) {
5783                 struct m_tag    *mtag;
5784                 struct altq_tag *atag;
5785
5786                 mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), MB_DONTWAIT);
5787                 if (mtag != NULL) {
5788                         atag = (struct altq_tag *)(mtag + 1);
5789                         if (pd.tos == IPTOS_LOWDELAY)
5790                                 atag->qid = r->pqid;
5791                         else
5792                                 atag->qid = r->qid;
5793                         /* add hints for ecn */
5794                         atag->af = AF_INET6;
5795                         atag->hdr = h;
5796                         m_tag_prepend(m, mtag);
5797                 }
5798         }
5799 #endif
5800
5801         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5802             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5803             (s->nat_rule.ptr->action == PF_RDR ||
5804             s->nat_rule.ptr->action == PF_BINAT) &&
5805             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) {
5806                 action = PF_DROP;
5807                 REASON_SET(&reason, PFRES_MEMORY);
5808         }
5809
5810         m->m_pkthdr.pf_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5811
5812         if (log)
5813                 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset);
5814
5815         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5816         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
5817
5818         if (action == PF_PASS || r->action == PF_DROP) {
5819                 r->packets++;
5820                 r->bytes += pd.tot_len;
5821                 if (a != NULL) {
5822                         a->packets++;
5823                         a->bytes += pd.tot_len;
5824                 }
5825                 if (s != NULL) {
5826                         dirndx = (dir == s->direction) ? 0 : 1;
5827                         s->packets[dirndx]++;
5828                         s->bytes[dirndx] += pd.tot_len;
5829                         if (s->nat_rule.ptr != NULL) {
5830                                 s->nat_rule.ptr->packets++;
5831                                 s->nat_rule.ptr->bytes += pd.tot_len;
5832                         }
5833                         if (s->src_node != NULL) {
5834                                 s->src_node->packets++;
5835                                 s->src_node->bytes += pd.tot_len;
5836                         }
5837                         if (s->nat_src_node != NULL) {
5838                                 s->nat_src_node->packets++;
5839                                 s->nat_src_node->bytes += pd.tot_len;
5840                         }
5841                 }
5842                 tr = r;
5843                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5844                 if (nr != NULL) {
5845                         struct pf_addr *x;
5846                         /*
5847                          * XXX: we need to make sure that the addresses
5848                          * passed to pfr_update_stats() are the same than
5849                          * the addresses used during matching (pfr_match)
5850                          */
5851                         if (r == &pf_default_rule) {
5852                                 tr = nr;
5853                                 x = (s == NULL || s->direction == dir) ?
5854                                     &pd.baddr : &pd.naddr;
5855                         } else {
5856                                 x = (s == NULL || s->direction == dir) ?
5857                                     &pd.naddr : &pd.baddr;
5858                         }
5859                         if (x == &pd.baddr || s == NULL) {
5860                                 if (dir == PF_OUT)
5861                                         pd.src = x;
5862                                 else
5863                                         pd.dst = x;
5864                         }
5865                 }
5866                 if (tr->src.addr.type == PF_ADDR_TABLE)
5867                         pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5868                             s->direction == dir) ? pd.src : pd.dst, pd.af,
5869                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5870                             tr->src.not);
5871                 if (tr->dst.addr.type == PF_ADDR_TABLE)
5872                         pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5873                             s->direction == dir) ? pd.dst : pd.src, pd.af,
5874                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5875                             tr->dst.not);
5876         }
5877
5878
5879         if (action == PF_SYNPROXY_DROP) {
5880                 m_freem(*m0);
5881                 *m0 = NULL;
5882                 action = PF_PASS;
5883         } else if (r->rt)
5884                 /* pf_route6 can free the mbuf causing *m0 to become NULL */
5885                 pf_route6(m0, r, dir, ifp, s);
5886
5887         return (action);
5888 }
5889 #endif /* INET6 */