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 1.17 2008/04/07 00:43:44 dillon Exp $ */
   5
   6 /*
   7  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
   8  *
   9  * Copyright (c) 2001 Daniel Hartmeier
  10  * Copyright (c) 2002,2003 Henning Brauer
  11  * All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  *
  17  *    - Redistributions of source code must retain the above copyright
  18  *      notice, this list of conditions and the following disclaimer.
  19  *    - Redistributions in binary form must reproduce the above
  20  *      copyright notice, this list of conditions and the following
  21  *      disclaimer in the documentation and/or other materials provided
  22  *      with the distribution.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  27  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  28  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  30  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  31  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  32  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  34  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Effort sponsored in part by the Defense Advanced Research Projects
  38  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  39  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  40  *
  41  */
  42
  43 #include "opt_inet.h"
  44 #include "opt_inet6.h"
  45 #include "use_pfsync.h"
  46
  47 #include <sys/param.h>
  48 #include <sys/systm.h>
  49 #include <sys/malloc.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/filio.h>
  52 #include <sys/socket.h>
  53 #include <sys/socketvar.h>
  54 #include <sys/kernel.h>
  55 #include <sys/time.h>
  56 #include <sys/sysctl.h>
  57 #include <sys/endian.h>
  58 #include <vm/vm_zone.h>
  59
  60 #include <machine/inttypes.h>
  61
  62 #include <net/if.h>
  63 #include <net/if_types.h>
  64 #include <net/bpf.h>
  65 #include <net/netisr.h>
  66 #include <net/route.h>
  67
  68 #include <netinet/in.h>
  69 #include <netinet/in_var.h>
  70 #include <netinet/in_systm.h>
  71 #include <netinet/ip.h>
  72 #include <netinet/ip_var.h>
  73 #include <netinet/tcp.h>
  74 #include <netinet/tcp_seq.h>
  75 #include <netinet/udp.h>
  76 #include <netinet/ip_icmp.h>
  77 #include <netinet/in_pcb.h>
  78 #include <netinet/tcp_timer.h>
  79 #include <netinet/tcp_var.h>
  80 #include <netinet/udp_var.h>
  81 #include <netinet/icmp_var.h>
  82
  83 #include <net/pf/pfvar.h>
  84 #include <net/pf/if_pflog.h>
  85
  86 #if NPFSYNC > 0
  87 #include <net/pf/if_pfsync.h>
  88 #endif /* NPFSYNC > 0 */
  89
  90 #ifdef INET6
  91 #include <netinet/ip6.h>
  92 #include <netinet/in_pcb.h>
  93 #include <netinet/icmp6.h>
  94 #include <netinet6/nd6.h>
  95 #include <netinet6/ip6_var.h>
  96 #include <netinet6/in6_pcb.h>
  97 #endif /* INET6 */
  98
  99 #include <sys/in_cksum.h>
 100 #include <sys/ucred.h>
 101 #include <machine/limits.h>
 102 #include <sys/msgport2.h>
 103 #include <net/netmsg2.h>
 104
 105 extern int ip_optcopy(struct ip *, struct ip *);
 106
 107 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
 108
 109 /*
 110  * Global variables
 111  */
 112
 113 struct pf_anchorqueue    pf_anchors;
 114 struct pf_ruleset        pf_main_ruleset;
 115 struct pf_altqqueue      pf_altqs[2];
 116 struct pf_palist         pf_pabuf;
 117 struct pf_altqqueue     *pf_altqs_active;
 118 struct pf_altqqueue     *pf_altqs_inactive;
 119 struct pf_status         pf_status;
 120
 121 u_int32_t                ticket_altqs_active;
 122 u_int32_t                ticket_altqs_inactive;
 123 int                      altqs_inactive_open;
 124 u_int32_t                ticket_pabuf;
 125
 126 struct callout           pf_expire_to;                  /* expire timeout */
 127
 128 vm_zone_t                pf_src_tree_pl, pf_rule_pl;
 129 vm_zone_t                pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
 130
 131 void                     pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
 132 void                     pf_print_state(struct pf_state *);
 133 void                     pf_print_flags(u_int8_t);
 134
 135 u_int16_t                pf_cksum_fixup(u_int16_t, u_int16_t, u_int16_t,
 136                             u_int8_t);
 137 void                     pf_change_ap(struct pf_addr *, u_int16_t *,
 138                             u_int16_t *, u_int16_t *, struct pf_addr *,
 139                             u_int16_t, u_int8_t, sa_family_t);
 140 #ifdef INET6
 141 void                     pf_change_a6(struct pf_addr *, u_int16_t *,
 142                             struct pf_addr *, u_int8_t);
 143 #endif /* INET6 */
 144 void                     pf_change_icmp(struct pf_addr *, u_int16_t *,
 145                             struct pf_addr *, struct pf_addr *, u_int16_t,
 146                             u_int16_t *, u_int16_t *, u_int16_t *,
 147                             u_int16_t *, u_int8_t, sa_family_t);
 148 void                     pf_send_tcp(const struct pf_rule *, sa_family_t,
 149                             const struct pf_addr *, const struct pf_addr *,
 150                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 151                             u_int8_t, u_int16_t, u_int16_t, u_int8_t);
 152 void                     pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 153                             sa_family_t, struct pf_rule *);
 154 struct pf_rule          *pf_match_translation(struct pf_pdesc *, struct mbuf *,
 155                             int, int, struct pfi_kif *,
 156                             struct pf_addr *, u_int16_t, struct pf_addr *,
 157                             u_int16_t, int);
 158 struct pf_rule          *pf_get_translation(struct pf_pdesc *, struct mbuf *,
 159                             int, int, struct pfi_kif *, struct pf_src_node **,
 160                             struct pf_addr *, u_int16_t,
 161                             struct pf_addr *, u_int16_t,
 162                             struct pf_addr *, u_int16_t *);
 163 int                      pf_test_tcp(struct pf_rule **, struct pf_state **,
 164                             int, struct pfi_kif *, struct mbuf *, int,
 165                             void *, struct pf_pdesc *, struct pf_rule **,
 166                             struct pf_ruleset **);
 167 int                      pf_test_udp(struct pf_rule **, struct pf_state **,
 168                             int, struct pfi_kif *, struct mbuf *, int,
 169                             void *, struct pf_pdesc *, struct pf_rule **,
 170                             struct pf_ruleset **);
 171 int                      pf_test_icmp(struct pf_rule **, struct pf_state **,
 172                             int, struct pfi_kif *, struct mbuf *, int,
 173                             void *, struct pf_pdesc *, struct pf_rule **,
 174                             struct pf_ruleset **);
 175 int                      pf_test_other(struct pf_rule **, struct pf_state **,
 176                             int, struct pfi_kif *, struct mbuf *, int, void *,
 177                             struct pf_pdesc *, struct pf_rule **,
 178                             struct pf_ruleset **);
 179 int                      pf_test_fragment(struct pf_rule **, int,
 180                             struct pfi_kif *, struct mbuf *, void *,
 181                             struct pf_pdesc *, struct pf_rule **,
 182                             struct pf_ruleset **);
 183 int                      pf_test_state_tcp(struct pf_state **, int,
 184                             struct pfi_kif *, struct mbuf *, int,
 185                             void *, struct pf_pdesc *, u_short *);
 186 int                      pf_test_state_udp(struct pf_state **, int,
 187                             struct pfi_kif *, struct mbuf *, int,
 188                             void *, struct pf_pdesc *);
 189 int                      pf_test_state_icmp(struct pf_state **, int,
 190                             struct pfi_kif *, struct mbuf *, int,
 191                             void *, struct pf_pdesc *);
 192 int                      pf_test_state_other(struct pf_state **, int,
 193                             struct pfi_kif *, struct pf_pdesc *);
 194 static int               pf_match_tag(struct mbuf *, struct pf_rule *,
 195                                       struct pf_rule *, int *);
 196 void                     pf_hash(struct pf_addr *, struct pf_addr *,
 197                             struct pf_poolhashkey *, sa_family_t);
 198 int                      pf_map_addr(u_int8_t, struct pf_rule *,
 199                             struct pf_addr *, struct pf_addr *,
 200                             struct pf_addr *, struct pf_src_node **);
 201 int                      pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
 202                             struct pf_addr *, struct pf_addr *, u_int16_t,
 203                             struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
 204                             struct pf_src_node **);
 205 void                     pf_route(struct mbuf **, struct pf_rule *, int,
 206                             struct ifnet *, struct pf_state *);
 207 void                     pf_route6(struct mbuf **, struct pf_rule *, int,
 208                             struct ifnet *, struct pf_state *);
 209 int                      pf_socket_lookup(uid_t *, gid_t *,
 210                             int, struct pf_pdesc *);
 211 u_int8_t                 pf_get_wscale(struct mbuf *, int, u_int16_t,
 212                             sa_family_t);
 213 u_int16_t                pf_get_mss(struct mbuf *, int, u_int16_t,
 214                             sa_family_t);
 215 u_int16_t                pf_calc_mss(struct pf_addr *, sa_family_t,
 216                                 u_int16_t);
 217 void                     pf_set_rt_ifp(struct pf_state *,
 218                             struct pf_addr *);
 219 int                      pf_check_proto_cksum(struct mbuf *, int, int,
 220                             u_int8_t, sa_family_t);
 221 int                      pf_addr_wrap_neq(struct pf_addr_wrap *,
 222                             struct pf_addr_wrap *);
 223 struct pf_state         *pf_find_state_recurse(struct pfi_kif *,
 224                             struct pf_state *, u_int8_t);
 225
 226 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX];
 227
 228 #define STATE_LOOKUP()                                                  \
 229         do {                                                            \
 230                 if (direction == PF_IN)                                 \
 231                         *state = pf_find_state_recurse(         \
 232                             kif, &key, PF_EXT_GWY);                     \
 233                 else                                                    \
 234                         *state = pf_find_state_recurse(         \
 235                             kif, &key, PF_LAN_EXT);                     \
 236                 if (*state == NULL)                                     \
 237                         return (PF_DROP);                               \
 238                 if (direction == PF_OUT &&                              \
 239                     (((*state)->rule.ptr->rt == PF_ROUTETO &&           \
 240                     (*state)->rule.ptr->direction == PF_OUT) ||         \
 241                     ((*state)->rule.ptr->rt == PF_REPLYTO &&            \
 242                     (*state)->rule.ptr->direction == PF_IN)) &&         \
 243                     (*state)->rt_kif != NULL &&                         \
 244                     (*state)->rt_kif != kif)                            \
 245                         return (PF_PASS);                               \
 246         } while (0)
 247
 248 #define STATE_TRANSLATE(s) \
 249         (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \
 250         ((s)->af == AF_INET6 && \
 251         ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \
 252         (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \
 253         (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \
 254         (s)->lan.port != (s)->gwy.port
 255
 256 #define BOUND_IFACE(r, k) (((r)->rule_flag & PFRULE_IFBOUND) ? (k) :   \
 257         ((r)->rule_flag & PFRULE_GRBOUND) ? (k)->pfik_parent :         \
 258         (k)->pfik_parent->pfik_parent)
 259
 260 static int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
 261 static int pf_state_compare_lan_ext(struct pf_state *,
 262         struct pf_state *);
 263 static int pf_state_compare_ext_gwy(struct pf_state *,
 264         struct pf_state *);
 265 static int pf_state_compare_id(struct pf_state *,
 266         struct pf_state *);
 267
 268 struct pf_src_tree tree_src_tracking;
 269
 270 struct pf_state_tree_id tree_id;
 271 struct pf_state_queue state_updates;
 272
 273 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
 274 RB_GENERATE(pf_state_tree_lan_ext, pf_state,
 275     u.s.entry_lan_ext, pf_state_compare_lan_ext);
 276 RB_GENERATE(pf_state_tree_ext_gwy, pf_state,
 277     u.s.entry_ext_gwy, pf_state_compare_ext_gwy);
 278 RB_GENERATE(pf_state_tree_id, pf_state,
 279     u.s.entry_id, pf_state_compare_id);
 280
 281 static int
 282 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
 283 {
 284         int     diff;
 285
 286         if (a->rule.ptr > b->rule.ptr)
 287                 return (1);
 288         if (a->rule.ptr < b->rule.ptr)
 289                 return (-1);
 290         if ((diff = a->af - b->af) != 0)
 291                 return (diff);
 292         switch (a->af) {
 293 #ifdef INET
 294         case AF_INET:
 295                 if (a->addr.addr32[0] > b->addr.addr32[0])
 296                         return (1);
 297                 if (a->addr.addr32[0] < b->addr.addr32[0])
 298                         return (-1);
 299                 break;
 300 #endif /* INET */
 301 #ifdef INET6
 302         case AF_INET6:
 303                 if (a->addr.addr32[3] > b->addr.addr32[3])
 304                         return (1);
 305                 if (a->addr.addr32[3] < b->addr.addr32[3])
 306                         return (-1);
 307                 if (a->addr.addr32[2] > b->addr.addr32[2])
 308                         return (1);
 309                 if (a->addr.addr32[2] < b->addr.addr32[2])
 310                         return (-1);
 311                 if (a->addr.addr32[1] > b->addr.addr32[1])
 312                         return (1);
 313                 if (a->addr.addr32[1] < b->addr.addr32[1])
 314                         return (-1);
 315                 if (a->addr.addr32[0] > b->addr.addr32[0])
 316                         return (1);
 317                 if (a->addr.addr32[0] < b->addr.addr32[0])
 318                         return (-1);
 319                 break;
 320 #endif /* INET6 */
 321         }
 322         return (0);
 323 }
 324
 325 static
 326 int
 327 pf_state_hash(struct pf_state *s)
 328 {
 329         int hv = (intptr_t)s / sizeof(*s);
 330
 331         hv ^= crc32(&s->lan, sizeof(s->lan));
 332         hv ^= crc32(&s->gwy, sizeof(s->gwy));
 333         hv ^= crc32(&s->ext, sizeof(s->ext));
 334         return(hv);
 335 }
 336
 337 static int
 338 pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b)
 339 {
 340         int     diff;
 341
 342         if ((diff = a->proto - b->proto) != 0)
 343                 return (diff);
 344         if ((diff = a->af - b->af) != 0)
 345                 return (diff);
 346         switch (a->af) {
 347 #ifdef INET
 348         case AF_INET:
 349                 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
 350                         return (1);
 351                 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
 352                         return (-1);
 353                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 354                         return (1);
 355                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 356                         return (-1);
 357                 break;
 358 #endif /* INET */
 359 #ifdef INET6
 360         case AF_INET6:
 361                 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
 362                         return (1);
 363                 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
 364                         return (-1);
 365                 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
 366                         return (1);
 367                 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
 368                         return (-1);
 369                 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
 370                         return (1);
 371                 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
 372                         return (-1);
 373                 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
 374                         return (1);
 375                 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
 376                         return (-1);
 377                 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
 378                         return (1);
 379                 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
 380                         return (-1);
 381                 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
 382                         return (1);
 383                 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
 384                         return (-1);
 385                 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
 386                         return (1);
 387                 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
 388                         return (-1);
 389                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 390                         return (1);
 391                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 392                         return (-1);
 393                 break;
 394 #endif /* INET6 */
 395         }
 396
 397         if ((diff = a->lan.port - b->lan.port) != 0)
 398                 return (diff);
 399         if ((diff = a->ext.port - b->ext.port) != 0)
 400                 return (diff);
 401
 402         return (0);
 403 }
 404
 405 static int
 406 pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b)
 407 {
 408         int     diff;
 409
 410         if ((diff = a->proto - b->proto) != 0)
 411                 return (diff);
 412         if ((diff = a->af - b->af) != 0)
 413                 return (diff);
 414         switch (a->af) {
 415 #ifdef INET
 416         case AF_INET:
 417                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 418                         return (1);
 419                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 420                         return (-1);
 421                 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
 422                         return (1);
 423                 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
 424                         return (-1);
 425                 break;
 426 #endif /* INET */
 427 #ifdef INET6
 428         case AF_INET6:
 429                 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
 430                         return (1);
 431                 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
 432                         return (-1);
 433                 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
 434                         return (1);
 435                 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
 436                         return (-1);
 437                 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
 438                         return (1);
 439                 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
 440                         return (-1);
 441                 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
 442                         return (1);
 443                 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
 444                         return (-1);
 445                 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
 446                         return (1);
 447                 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
 448                         return (-1);
 449                 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
 450                         return (1);
 451                 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
 452                         return (-1);
 453                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 454                         return (1);
 455                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 456                         return (-1);
 457                 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
 458                         return (1);
 459                 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
 460                         return (-1);
 461                 break;
 462 #endif /* INET6 */
 463         }
 464
 465         if ((diff = a->ext.port - b->ext.port) != 0)
 466                 return (diff);
 467         if ((diff = a->gwy.port - b->gwy.port) != 0)
 468                 return (diff);
 469
 470         return (0);
 471 }
 472
 473 static int
 474 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
 475 {
 476         if (a->id > b->id)
 477                 return (1);
 478         if (a->id < b->id)
 479                 return (-1);
 480         if (a->creatorid > b->creatorid)
 481                 return (1);
 482         if (a->creatorid < b->creatorid)
 483                 return (-1);
 484
 485         return (0);
 486 }
 487
 488 #ifdef INET6
 489 void
 490 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 491 {
 492         switch (af) {
 493 #ifdef INET
 494         case AF_INET:
 495                 dst->addr32[0] = src->addr32[0];
 496                 break;
 497 #endif /* INET */
 498         case AF_INET6:
 499                 dst->addr32[0] = src->addr32[0];
 500                 dst->addr32[1] = src->addr32[1];
 501                 dst->addr32[2] = src->addr32[2];
 502                 dst->addr32[3] = src->addr32[3];
 503                 break;
 504         }
 505 }
 506 #endif
 507
 508 struct pf_state *
 509 pf_find_state_byid(struct pf_state *key)
 510 {
 511         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 512         return (RB_FIND(pf_state_tree_id, &tree_id, key));
 513 }
 514
 515 struct pf_state *
 516 pf_find_state_recurse(struct pfi_kif *kif, struct pf_state *key, u_int8_t tree)
 517 {
 518         struct pf_state *s;
 519
 520         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 521
 522         switch (tree) {
 523         case PF_LAN_EXT:
 524                 for (; kif != NULL; kif = kif->pfik_parent) {
 525                         s = RB_FIND(pf_state_tree_lan_ext,
 526                             &kif->pfik_lan_ext, key);
 527                         if (s != NULL)
 528                                 return (s);
 529                 }
 530                 return (NULL);
 531         case PF_EXT_GWY:
 532                 for (; kif != NULL; kif = kif->pfik_parent) {
 533                         s = RB_FIND(pf_state_tree_ext_gwy,
 534                             &kif->pfik_ext_gwy, key);
 535                         if (s != NULL)
 536                                 return (s);
 537                 }
 538                 return (NULL);
 539         default:
 540                 panic("pf_find_state_recurse");
 541         }
 542 }
 543
 544 struct pf_state *
 545 pf_find_state_all(struct pf_state *key, u_int8_t tree, int *more)
 546 {
 547         struct pf_state *s, *ss = NULL;
 548         struct pfi_kif  *kif;
 549
 550         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 551
 552         switch (tree) {
 553         case PF_LAN_EXT:
 554                 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
 555                         s = RB_FIND(pf_state_tree_lan_ext,
 556                             &kif->pfik_lan_ext, key);
 557                         if (s == NULL)
 558                                 continue;
 559                         if (more == NULL)
 560                                 return (s);
 561                         ss = s;
 562                         (*more)++;
 563                 }
 564                 return (ss);
 565         case PF_EXT_GWY:
 566                 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
 567                         s = RB_FIND(pf_state_tree_ext_gwy,
 568                             &kif->pfik_ext_gwy, key);
 569                         if (s == NULL)
 570                                 continue;
 571                         if (more == NULL)
 572                                 return (s);
 573                         ss = s;
 574                         (*more)++;
 575                 }
 576                 return (ss);
 577         default:
 578                 panic("pf_find_state_all");
 579         }
 580 }
 581
 582 int
 583 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 584     struct pf_addr *src, sa_family_t af)
 585 {
 586         struct pf_src_node      k;
 587
 588         if (*sn == NULL) {
 589                 k.af = af;
 590                 PF_ACPY(&k.addr, src, af);
 591                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 592                     rule->rpool.opts & PF_POOL_STICKYADDR)
 593                         k.rule.ptr = rule;
 594                 else
 595                         k.rule.ptr = NULL;
 596                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
 597                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
 598         }
 599         if (*sn == NULL) {
 600                 if (!rule->max_src_nodes ||
 601                     rule->src_nodes < rule->max_src_nodes)
 602                         (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT);
 603                 if ((*sn) == NULL)
 604                         return (-1);
 605                 bzero(*sn, sizeof(struct pf_src_node));
 606                 (*sn)->af = af;
 607                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 608                     rule->rpool.opts & PF_POOL_STICKYADDR)
 609                         (*sn)->rule.ptr = rule;
 610                 else
 611                         (*sn)->rule.ptr = NULL;
 612                 PF_ACPY(&(*sn)->addr, src, af);
 613                 if (RB_INSERT(pf_src_tree,
 614                     &tree_src_tracking, *sn) != NULL) {
 615                         if (pf_status.debug >= PF_DEBUG_MISC) {
 616                                 kprintf("pf: src_tree insert failed: ");
 617                                 pf_print_host(&(*sn)->addr, 0, af);
 618                                 kprintf("\n");
 619                         }
 620                         pool_put(&pf_src_tree_pl, *sn);
 621                         return (-1);
 622                 }
 623                 (*sn)->creation = time_second;
 624                 (*sn)->ruletype = rule->action;
 625                 if ((*sn)->rule.ptr != NULL)
 626                         (*sn)->rule.ptr->src_nodes++;
 627                 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
 628                 pf_status.src_nodes++;
 629         } else {
 630                 if (rule->max_src_states &&
 631                     (*sn)->states >= rule->max_src_states)
 632                         return (-1);
 633         }
 634         return (0);
 635 }
 636
 637 int
 638 pf_insert_state(struct pfi_kif *kif, struct pf_state *state)
 639 {
 640         /* Thou MUST NOT insert multiple duplicate keys */
 641         state->u.s.kif = kif;
 642         if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) {
 643                 if (pf_status.debug >= PF_DEBUG_MISC) {
 644                         kprintf("pf: state insert failed: tree_lan_ext");
 645                         kprintf(" lan: ");
 646                         pf_print_host(&state->lan.addr, state->lan.port,
 647                             state->af);
 648                         kprintf(" gwy: ");
 649                         pf_print_host(&state->gwy.addr, state->gwy.port,
 650                             state->af);
 651                         kprintf(" ext: ");
 652                         pf_print_host(&state->ext.addr, state->ext.port,
 653                             state->af);
 654                         if (state->sync_flags & PFSTATE_FROMSYNC)
 655                                 kprintf(" (from sync)");
 656                         kprintf("\n");
 657                 }
 658                 return (-1);
 659         }
 660
 661         if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) {
 662                 if (pf_status.debug >= PF_DEBUG_MISC) {
 663                         kprintf("pf: state insert failed: tree_ext_gwy");
 664                         kprintf(" lan: ");
 665                         pf_print_host(&state->lan.addr, state->lan.port,
 666                             state->af);
 667                         kprintf(" gwy: ");
 668                         pf_print_host(&state->gwy.addr, state->gwy.port,
 669                             state->af);
 670                         kprintf(" ext: ");
 671                         pf_print_host(&state->ext.addr, state->ext.port,
 672                             state->af);
 673                         if (state->sync_flags & PFSTATE_FROMSYNC)
 674                                 kprintf(" (from sync)");
 675                         kprintf("\n");
 676                 }
 677                 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
 678                 return (-1);
 679         }
 680
 681         if (state->id == 0 && state->creatorid == 0) {
 682                 state->id = htobe64(pf_status.stateid++);
 683                 state->creatorid = pf_status.hostid;
 684         }
 685         if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) {
 686                 if (pf_status.debug >= PF_DEBUG_MISC) {
 687                         kprintf("pf: state insert failed: "
 688                             "id: %016" PRIx64 " creatorid: %08" PRIx32,
 689                             be64toh(state->id), ntohl(state->creatorid));
 690                         if (state->sync_flags & PFSTATE_FROMSYNC)
 691                                 kprintf(" (from sync)");
 692                         kprintf("\n");
 693                 }
 694                 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
 695                 RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state);
 696                 return (-1);
 697         }
 698         TAILQ_INSERT_HEAD(&state_updates, state, u.s.entry_updates);
 699
 700         pf_status.fcounters[FCNT_STATE_INSERT]++;
 701         pf_status.states++;
 702         pfi_attach_state(kif);
 703 #if NPFSYNC
 704         pfsync_insert_state(state);
 705 #endif
 706         return (0);
 707 }
 708
 709 void
 710 pf_purge_timeout(void *arg)
 711 {
 712         struct callout  *to = arg;
 713
 714         crit_enter();
 715         pf_purge_expired_states();
 716         pf_purge_expired_fragments();
 717         pf_purge_expired_src_nodes();
 718         crit_exit();
 719
 720         callout_reset(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz,
 721             pf_purge_timeout, to);
 722 }
 723
 724 u_int32_t
 725 pf_state_expires(const struct pf_state *state)
 726 {
 727         u_int32_t       timeout;
 728         u_int32_t       start;
 729         u_int32_t       end;
 730         u_int32_t       states;
 731
 732         /* handle all PFTM_* > PFTM_MAX here */
 733         if (state->timeout == PFTM_PURGE)
 734                 return (time_second);
 735         if (state->timeout == PFTM_UNTIL_PACKET)
 736                 return (0);
 737         KASSERT((state->timeout < PFTM_MAX),
 738             ("pf_state_expires: timeout > PFTM_MAX"));
 739         timeout = state->rule.ptr->timeout[state->timeout];
 740         if (!timeout)
 741                 timeout = pf_default_rule.timeout[state->timeout];
 742         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
 743         if (start) {
 744                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
 745                 states = state->rule.ptr->states;
 746         } else {
 747                 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
 748                 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
 749                 states = pf_status.states;
 750         }
 751         if (end && states > start && start < end) {
 752                 if (states < end)
 753                         return (state->expire + timeout * (end - states) /
 754                             (end - start));
 755                 else
 756                         return (time_second);
 757         }
 758         return (state->expire + timeout);
 759 }
 760
 761 void
 762 pf_purge_expired_src_nodes(void)
 763 {
 764          struct pf_src_node             *cur, *next;
 765
 766          for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
 767                  next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
 768
 769                  if (cur->states <= 0 && cur->expire <= time_second) {
 770                          if (cur->rule.ptr != NULL) {
 771                                  cur->rule.ptr->src_nodes--;
 772                                  if (cur->rule.ptr->states <= 0 &&
 773                                      cur->rule.ptr->max_src_nodes <= 0)
 774                                          pf_rm_rule(NULL, cur->rule.ptr);
 775                          }
 776                          RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
 777                          pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
 778                          pf_status.src_nodes--;
 779                          pool_put(&pf_src_tree_pl, cur);
 780                  }
 781          }
 782 }
 783
 784 void
 785 pf_src_tree_remove_state(struct pf_state *s)
 786 {
 787         u_int32_t timeout;
 788
 789         if (s->src_node != NULL) {
 790                 if (--s->src_node->states <= 0) {
 791                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
 792                         if (!timeout)
 793                                 timeout =
 794                                     pf_default_rule.timeout[PFTM_SRC_NODE];
 795                         s->src_node->expire = time_second + timeout;
 796                 }
 797         }
 798         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
 799                 if (--s->nat_src_node->states <= 0) {
 800                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
 801                         if (!timeout)
 802                                 timeout =
 803                                     pf_default_rule.timeout[PFTM_SRC_NODE];
 804                         s->nat_src_node->expire = time_second + timeout;
 805                 }
 806         }
 807         s->src_node = s->nat_src_node = NULL;
 808 }
 809
 810 static int
 811 pf_purge_expired_states_callback(struct pf_state *cur, void *data __unused)
 812 {
 813         if (pf_state_expires(cur) <= time_second) {
 814                 RB_REMOVE(pf_state_tree_ext_gwy,
 815                     &cur->u.s.kif->pfik_ext_gwy, cur);
 816                 RB_REMOVE(pf_state_tree_lan_ext,
 817                     &cur->u.s.kif->pfik_lan_ext, cur);
 818                 RB_REMOVE(pf_state_tree_id, &tree_id, cur);
 819                 if (cur->src.state == PF_TCPS_PROXY_DST) {
 820                         pf_send_tcp(cur->rule.ptr, cur->af,
 821                             &cur->ext.addr, &cur->lan.addr,
 822                             cur->ext.port, cur->lan.port,
 823                             cur->src.seqhi, cur->src.seqlo + 1, 0,
 824                             TH_RST|TH_ACK, 0, 0);
 825                 }
 826 #if NPFSYNC
 827                 pfsync_delete_state(cur);
 828 #endif
 829                 pf_src_tree_remove_state(cur);
 830                 if (--cur->rule.ptr->states <= 0 &&
 831                     cur->rule.ptr->src_nodes <= 0)
 832                         pf_rm_rule(NULL, cur->rule.ptr);
 833                 if (cur->nat_rule.ptr != NULL)
 834                         if (--cur->nat_rule.ptr->states <= 0 &&
 835                                 cur->nat_rule.ptr->src_nodes <= 0)
 836                                 pf_rm_rule(NULL, cur->nat_rule.ptr);
 837                 if (cur->anchor.ptr != NULL)
 838                         if (--cur->anchor.ptr->states <= 0)
 839                                 pf_rm_rule(NULL, cur->anchor.ptr);
 840                 pf_normalize_tcp_cleanup(cur);
 841                 pfi_detach_state(cur->u.s.kif);
 842                 TAILQ_REMOVE(&state_updates, cur, u.s.entry_updates);
 843                 pool_put(&pf_state_pl, cur);
 844                 pf_status.fcounters[FCNT_STATE_REMOVALS]++;
 845                 pf_status.states--;
 846         }
 847         return(0);
 848 }
 849
 850 void
 851 pf_purge_expired_states(void)
 852 {
 853         RB_SCAN(pf_state_tree_id, &tree_id, NULL,
 854                 pf_purge_expired_states_callback, NULL);
 855 }
 856
 857
 858 int
 859 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
 860 {
 861         if (aw->type != PF_ADDR_TABLE)
 862                 return (0);
 863         if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
 864                 return (1);
 865         return (0);
 866 }
 867
 868 void
 869 pf_tbladdr_remove(struct pf_addr_wrap *aw)
 870 {
 871         if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
 872                 return;
 873         pfr_detach_table(aw->p.tbl);
 874         aw->p.tbl = NULL;
 875 }
 876
 877 void
 878 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
 879 {
 880         struct pfr_ktable *kt = aw->p.tbl;
 881
 882         if (aw->type != PF_ADDR_TABLE || kt == NULL)
 883                 return;
 884         if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
 885                 kt = kt->pfrkt_root;
 886         aw->p.tbl = NULL;
 887         aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
 888                 kt->pfrkt_cnt : -1;
 889 }
 890
 891 void
 892 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
 893 {
 894         switch (af) {
 895 #ifdef INET
 896         case AF_INET: {
 897                 u_int32_t a = ntohl(addr->addr32[0]);
 898                 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
 899                     (a>>8)&255, a&255);
 900                 if (p) {
 901                         p = ntohs(p);
 902                         kprintf(":%u", p);
 903                 }
 904                 break;
 905         }
 906 #endif /* INET */
 907 #ifdef INET6
 908         case AF_INET6: {
 909                 u_int16_t b;
 910                 u_int8_t i, curstart = 255, curend = 0,
 911                     maxstart = 0, maxend = 0;
 912                 for (i = 0; i < 8; i++) {
 913                         if (!addr->addr16[i]) {
 914                                 if (curstart == 255)
 915                                         curstart = i;
 916                                 else
 917                                         curend = i;
 918                         } else {
 919                                 if (curstart) {
 920                                         if ((curend - curstart) >
 921                                             (maxend - maxstart)) {
 922                                                 maxstart = curstart;
 923                                                 maxend = curend;
 924                                                 curstart = 255;
 925                                         }
 926                                 }
 927                         }
 928                 }
 929                 for (i = 0; i < 8; i++) {
 930                         if (i >= maxstart && i <= maxend) {
 931                                 if (maxend != 7) {
 932                                         if (i == maxstart)
 933                                                 kprintf(":");
 934                                 } else {
 935                                         if (i == maxend)
 936                                                 kprintf(":");
 937                                 }
 938                         } else {
 939                                 b = ntohs(addr->addr16[i]);
 940                                 kprintf("%x", b);
 941                                 if (i < 7)
 942                                         kprintf(":");
 943                         }
 944                 }
 945                 if (p) {
 946                         p = ntohs(p);
 947                         kprintf("[%u]", p);
 948                 }
 949                 break;
 950         }
 951 #endif /* INET6 */
 952         }
 953 }
 954
 955 void
 956 pf_print_state(struct pf_state *s)
 957 {
 958         switch (s->proto) {
 959         case IPPROTO_TCP:
 960                 kprintf("TCP ");
 961                 break;
 962         case IPPROTO_UDP:
 963                 kprintf("UDP ");
 964                 break;
 965         case IPPROTO_ICMP:
 966                 kprintf("ICMP ");
 967                 break;
 968         case IPPROTO_ICMPV6:
 969                 kprintf("ICMPV6 ");
 970                 break;
 971         default:
 972                 kprintf("%u ", s->proto);
 973                 break;
 974         }
 975         pf_print_host(&s->lan.addr, s->lan.port, s->af);
 976         kprintf(" ");
 977         pf_print_host(&s->gwy.addr, s->gwy.port, s->af);
 978         kprintf(" ");
 979         pf_print_host(&s->ext.addr, s->ext.port, s->af);
 980         kprintf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
 981             s->src.seqhi, s->src.max_win, s->src.seqdiff);
 982         if (s->src.wscale && s->dst.wscale)
 983                 kprintf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
 984         kprintf("]");
 985         kprintf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
 986             s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
 987         if (s->src.wscale && s->dst.wscale)
 988                 kprintf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
 989         kprintf("]");
 990         kprintf(" %u:%u", s->src.state, s->dst.state);
 991 }
 992
 993 void
 994 pf_print_flags(u_int8_t f)
 995 {
 996         if (f)
 997                 kprintf(" ");
 998         if (f & TH_FIN)
 999                 kprintf("F");
1000         if (f & TH_SYN)
1001                 kprintf("S");
1002         if (f & TH_RST)
1003                 kprintf("R");
1004         if (f & TH_PUSH)
1005                 kprintf("P");
1006         if (f & TH_ACK)
1007                 kprintf("A");
1008         if (f & TH_URG)
1009                 kprintf("U");
1010         if (f & TH_ECE)
1011                 kprintf("E");
1012         if (f & TH_CWR)
1013                 kprintf("W");
1014 }
1015
1016 #define PF_SET_SKIP_STEPS(i)                                    \
1017         do {                                                    \
1018                 while (head[i] != cur) {                        \
1019                         head[i]->skip[i].ptr = cur;             \
1020                         head[i] = TAILQ_NEXT(head[i], entries); \
1021                 }                                               \
1022         } while (0)
1023
1024 void
1025 pf_calc_skip_steps(struct pf_rulequeue *rules)
1026 {
1027         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1028         int i;
1029
1030         cur = TAILQ_FIRST(rules);
1031         prev = cur;
1032         for (i = 0; i < PF_SKIP_COUNT; ++i)
1033                 head[i] = cur;
1034         while (cur != NULL) {
1035
1036                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1037                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1038                 if (cur->direction != prev->direction)
1039                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1040                 if (cur->af != prev->af)
1041                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
1042                 if (cur->proto != prev->proto)
1043                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1044                 if (cur->src.not != prev->src.not ||
1045                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1046                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1047                 if (cur->src.port[0] != prev->src.port[0] ||
1048                     cur->src.port[1] != prev->src.port[1] ||
1049                     cur->src.port_op != prev->src.port_op)
1050                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1051                 if (cur->dst.not != prev->dst.not ||
1052                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1053                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1054                 if (cur->dst.port[0] != prev->dst.port[0] ||
1055                     cur->dst.port[1] != prev->dst.port[1] ||
1056                     cur->dst.port_op != prev->dst.port_op)
1057                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1058
1059                 prev = cur;
1060                 cur = TAILQ_NEXT(cur, entries);
1061         }
1062         for (i = 0; i < PF_SKIP_COUNT; ++i)
1063                 PF_SET_SKIP_STEPS(i);
1064 }
1065
1066 int
1067 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1068 {
1069         if (aw1->type != aw2->type)
1070                 return (1);
1071         switch (aw1->type) {
1072         case PF_ADDR_ADDRMASK:
1073                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1074                         return (1);
1075                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1076                         return (1);
1077                 return (0);
1078         case PF_ADDR_DYNIFTL:
1079                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1080         case PF_ADDR_NOROUTE:
1081                 return (0);
1082         case PF_ADDR_TABLE:
1083                 return (aw1->p.tbl != aw2->p.tbl);
1084         default:
1085                 kprintf("invalid address type: %d\n", aw1->type);
1086                 return (1);
1087         }
1088 }
1089
1090 void
1091 pf_update_anchor_rules(void)
1092 {
1093         struct pf_rule  *rule;
1094         int              i;
1095
1096         for (i = 0; i < PF_RULESET_MAX; ++i)
1097                 TAILQ_FOREACH(rule, pf_main_ruleset.rules[i].active.ptr,
1098                     entries)
1099                         if (rule->anchorname[0])
1100                                 rule->anchor = pf_find_anchor(rule->anchorname);
1101                         else
1102                                 rule->anchor = NULL;
1103 }
1104
1105 u_int16_t
1106 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1107 {
1108         u_int32_t       l;
1109
1110         if (udp && !cksum)
1111                 return (0x0000);
1112         l = cksum + old - new;
1113         l = (l >> 16) + (l & 65535);
1114         l = l & 65535;
1115         if (udp && !l)
1116                 return (0xFFFF);
1117         return (l);
1118 }
1119
1120 void
1121 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1122     struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1123 {
1124         struct pf_addr  ao;
1125         u_int16_t       po = *p;
1126
1127         PF_ACPY(&ao, a, af);
1128         PF_ACPY(a, an, af);
1129
1130         *p = pn;
1131
1132         switch (af) {
1133 #ifdef INET
1134         case AF_INET:
1135                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1136                     ao.addr16[0], an->addr16[0], 0),
1137                     ao.addr16[1], an->addr16[1], 0);
1138                 *p = pn;
1139                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1140                     ao.addr16[0], an->addr16[0], u),
1141                     ao.addr16[1], an->addr16[1], u),
1142                     po, pn, u);
1143                 break;
1144 #endif /* INET */
1145 #ifdef INET6
1146         case AF_INET6:
1147                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1148                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1149                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1150                     ao.addr16[0], an->addr16[0], u),
1151                     ao.addr16[1], an->addr16[1], u),
1152                     ao.addr16[2], an->addr16[2], u),
1153                     ao.addr16[3], an->addr16[3], u),
1154                     ao.addr16[4], an->addr16[4], u),
1155                     ao.addr16[5], an->addr16[5], u),
1156                     ao.addr16[6], an->addr16[6], u),
1157                     ao.addr16[7], an->addr16[7], u),
1158                     po, pn, u);
1159                 break;
1160 #endif /* INET6 */
1161         }
1162 }
1163
1164
1165 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
1166 void
1167 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1168 {
1169         u_int32_t       ao;
1170
1171         memcpy(&ao, a, sizeof(ao));
1172         memcpy(a, &an, sizeof(u_int32_t));
1173         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1174             ao % 65536, an % 65536, u);
1175 }
1176
1177 #ifdef INET6
1178 void
1179 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1180 {
1181         struct pf_addr  ao;
1182
1183         PF_ACPY(&ao, a, AF_INET6);
1184         PF_ACPY(a, an, AF_INET6);
1185
1186         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1187             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1188             pf_cksum_fixup(pf_cksum_fixup(*c,
1189             ao.addr16[0], an->addr16[0], u),
1190             ao.addr16[1], an->addr16[1], u),
1191             ao.addr16[2], an->addr16[2], u),
1192             ao.addr16[3], an->addr16[3], u),
1193             ao.addr16[4], an->addr16[4], u),
1194             ao.addr16[5], an->addr16[5], u),
1195             ao.addr16[6], an->addr16[6], u),
1196             ao.addr16[7], an->addr16[7], u);
1197 }
1198 #endif /* INET6 */
1199
1200 void
1201 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1202     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1203     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1204 {
1205         struct pf_addr  oia, ooa;
1206
1207         PF_ACPY(&oia, ia, af);
1208         PF_ACPY(&ooa, oa, af);
1209
1210         /* Change inner protocol port, fix inner protocol checksum. */
1211         if (ip != NULL) {
1212                 u_int16_t       oip = *ip;
1213                 u_int32_t       opc = 0;
1214
1215                 if (pc != NULL)
1216                         opc = *pc;
1217                 *ip = np;
1218                 if (pc != NULL)
1219                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1220                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1221                 if (pc != NULL)
1222                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1223         }
1224         /* Change inner ip address, fix inner ip and icmp checksums. */
1225         PF_ACPY(ia, na, af);
1226         switch (af) {
1227 #ifdef INET
1228         case AF_INET: {
1229                 u_int32_t        oh2c = *h2c;
1230
1231                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1232                     oia.addr16[0], ia->addr16[0], 0),
1233                     oia.addr16[1], ia->addr16[1], 0);
1234                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1235                     oia.addr16[0], ia->addr16[0], 0),
1236                     oia.addr16[1], ia->addr16[1], 0);
1237                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1238                 break;
1239         }
1240 #endif /* INET */
1241 #ifdef INET6
1242         case AF_INET6:
1243                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1244                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1245                     pf_cksum_fixup(pf_cksum_fixup(*ic,
1246                     oia.addr16[0], ia->addr16[0], u),
1247                     oia.addr16[1], ia->addr16[1], u),
1248                     oia.addr16[2], ia->addr16[2], u),
1249                     oia.addr16[3], ia->addr16[3], u),
1250                     oia.addr16[4], ia->addr16[4], u),
1251                     oia.addr16[5], ia->addr16[5], u),
1252                     oia.addr16[6], ia->addr16[6], u),
1253                     oia.addr16[7], ia->addr16[7], u);
1254                 break;
1255 #endif /* INET6 */
1256         }
1257         /* Change outer ip address, fix outer ip or icmpv6 checksum. */
1258         PF_ACPY(oa, na, af);
1259         switch (af) {
1260 #ifdef INET
1261         case AF_INET:
1262                 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1263                     ooa.addr16[0], oa->addr16[0], 0),
1264                     ooa.addr16[1], oa->addr16[1], 0);
1265                 break;
1266 #endif /* INET */
1267 #ifdef INET6
1268         case AF_INET6:
1269                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1270                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1271                     pf_cksum_fixup(pf_cksum_fixup(*ic,
1272                     ooa.addr16[0], oa->addr16[0], u),
1273                     ooa.addr16[1], oa->addr16[1], u),
1274                     ooa.addr16[2], oa->addr16[2], u),
1275                     ooa.addr16[3], oa->addr16[3], u),
1276                     ooa.addr16[4], oa->addr16[4], u),
1277                     ooa.addr16[5], oa->addr16[5], u),
1278                     ooa.addr16[6], oa->addr16[6], u),
1279                     ooa.addr16[7], oa->addr16[7], u);
1280                 break;
1281 #endif /* INET6 */
1282         }
1283 }
1284
1285 void
1286 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1287     const struct pf_addr *saddr, const struct pf_addr *daddr,
1288     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1289     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl)
1290 {
1291         struct mbuf     *m;
1292         int              len = 0, tlen;
1293 #ifdef INET
1294         struct ip       *h = NULL;
1295 #endif /* INET */
1296 #ifdef INET6
1297         struct ip6_hdr  *h6 = NULL;
1298 #endif /* INET6 */
1299         struct tcphdr   *th = NULL;
1300         char *opt;
1301
1302         /* maximum segment size tcp option */
1303         tlen = sizeof(struct tcphdr);
1304         if (mss)
1305                 tlen += 4;
1306
1307         switch (af) {
1308 #ifdef INET
1309         case AF_INET:
1310                 len = sizeof(struct ip) + tlen;
1311                 break;
1312 #endif /* INET */
1313 #ifdef INET6
1314         case AF_INET6:
1315                 len = sizeof(struct ip6_hdr) + tlen;
1316                 break;
1317 #endif /* INET6 */
1318         }
1319
1320         /* create outgoing mbuf */
1321         m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1322         if (m == NULL)
1323                 return;
1324         m->m_pkthdr.fw_flags = PF_MBUF_GENERATED;
1325 #ifdef ALTQ
1326         if (r != NULL && r->qid) {
1327                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
1328                 m->m_pkthdr.altq_qid = r->qid;
1329                 m->m_pkthdr.ecn_af = af;
1330                 m->m_pkthdr.header = mtod(m, struct ip *);
1331         }
1332 #endif
1333         m->m_data += max_linkhdr;
1334         m->m_pkthdr.len = m->m_len = len;
1335         m->m_pkthdr.rcvif = NULL;
1336         bzero(m->m_data, len);
1337         switch (af) {
1338 #ifdef INET
1339         case AF_INET:
1340                 h = mtod(m, struct ip *);
1341
1342                 /* IP header fields included in the TCP checksum */
1343                 h->ip_p = IPPROTO_TCP;
1344                 h->ip_len = tlen;
1345                 h->ip_src.s_addr = saddr->v4.s_addr;
1346                 h->ip_dst.s_addr = daddr->v4.s_addr;
1347
1348                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1349                 break;
1350 #endif /* INET */
1351 #ifdef INET6
1352         case AF_INET6:
1353                 h6 = mtod(m, struct ip6_hdr *);
1354
1355                 /* IP header fields included in the TCP checksum */
1356                 h6->ip6_nxt = IPPROTO_TCP;
1357                 h6->ip6_plen = htons(tlen);
1358                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1359                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1360
1361                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1362                 break;
1363 #endif /* INET6 */
1364         }
1365
1366         /* TCP header */
1367         th->th_sport = sport;
1368         th->th_dport = dport;
1369         th->th_seq = htonl(seq);
1370         th->th_ack = htonl(ack);
1371         th->th_off = tlen >> 2;
1372         th->th_flags = flags;
1373         th->th_win = htons(win);
1374
1375         if (mss) {
1376                 opt = (char *)(th + 1);
1377                 opt[0] = TCPOPT_MAXSEG;
1378                 opt[1] = 4;
1379                 mss = htons(mss);
1380                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1381         }
1382
1383         switch (af) {
1384 #ifdef INET
1385         case AF_INET:
1386                 /* TCP checksum */
1387                 th->th_sum = in_cksum(m, len);
1388
1389                 /* Finish the IP header */
1390                 h->ip_v = 4;
1391                 h->ip_hl = sizeof(*h) >> 2;
1392                 h->ip_tos = IPTOS_LOWDELAY;
1393                 h->ip_len = len;
1394                 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1395                 h->ip_ttl = ttl ? ttl : ip_defttl;
1396                 h->ip_sum = 0;
1397                 ip_output(m, (void *)NULL, (void *)NULL, 0, (void *)NULL,
1398                     (void *)NULL);
1399                 break;
1400 #endif /* INET */
1401 #ifdef INET6
1402         case AF_INET6:
1403                 /* TCP checksum */
1404                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1405                     sizeof(struct ip6_hdr), tlen);
1406
1407                 h6->ip6_vfc |= IPV6_VERSION;
1408                 h6->ip6_hlim = IPV6_DEFHLIM;
1409
1410                 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
1411                 break;
1412 #endif /* INET6 */
1413         }
1414 }
1415
1416 void
1417 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1418     struct pf_rule *r)
1419 {
1420         struct mbuf     *m0;
1421
1422         m0 = m_copypacket(m, MB_DONTWAIT);
1423         if (m0 == NULL)
1424                 return;
1425         m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED;
1426
1427 #ifdef ALTQ
1428         if (r->qid) {
1429                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
1430                 m->m_pkthdr.altq_qid = r->qid;
1431                 m->m_pkthdr.ecn_af = af;
1432                 m->m_pkthdr.header = mtod(m0, struct ip *);
1433         }
1434 #endif
1435
1436         switch (af) {
1437 #ifdef INET
1438         case AF_INET:
1439                 icmp_error(m0, type, code, 0, 0);
1440                 break;
1441 #endif /* INET */
1442 #ifdef INET6
1443         case AF_INET6:
1444                 icmp6_error(m0, type, code, 0);
1445                 break;
1446 #endif /* INET6 */
1447         }
1448 }
1449
1450 /*
1451  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1452  * If n is 0, they match if they are equal. If n is != 0, they match if they
1453  * are different.
1454  */
1455 int
1456 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1457     struct pf_addr *b, sa_family_t af)
1458 {
1459         int     match = 0;
1460
1461         switch (af) {
1462 #ifdef INET
1463         case AF_INET:
1464                 if ((a->addr32[0] & m->addr32[0]) ==
1465                     (b->addr32[0] & m->addr32[0]))
1466                         match++;
1467                 break;
1468 #endif /* INET */
1469 #ifdef INET6
1470         case AF_INET6:
1471                 if (((a->addr32[0] & m->addr32[0]) ==
1472                      (b->addr32[0] & m->addr32[0])) &&
1473                     ((a->addr32[1] & m->addr32[1]) ==
1474                      (b->addr32[1] & m->addr32[1])) &&
1475                     ((a->addr32[2] & m->addr32[2]) ==
1476                      (b->addr32[2] & m->addr32[2])) &&
1477                     ((a->addr32[3] & m->addr32[3]) ==
1478                      (b->addr32[3] & m->addr32[3])))
1479                         match++;
1480                 break;
1481 #endif /* INET6 */
1482         }
1483         if (match) {
1484                 if (n)
1485                         return (0);
1486                 else
1487                         return (1);
1488         } else {
1489                 if (n)
1490                         return (1);
1491                 else
1492                         return (0);
1493         }
1494 }
1495
1496 int
1497 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
1498 {
1499         switch (op) {
1500         case PF_OP_IRG:
1501                 return ((p > a1) && (p < a2));
1502         case PF_OP_XRG:
1503                 return ((p < a1) || (p > a2));
1504         case PF_OP_RRG:
1505                 return ((p >= a1) && (p <= a2));
1506         case PF_OP_EQ:
1507                 return (p == a1);
1508         case PF_OP_NE:
1509                 return (p != a1);
1510         case PF_OP_LT:
1511                 return (p < a1);
1512         case PF_OP_LE:
1513                 return (p <= a1);
1514         case PF_OP_GT:
1515                 return (p > a1);
1516         case PF_OP_GE:
1517                 return (p >= a1);
1518         }
1519         return (0); /* never reached */
1520 }
1521
1522 int
1523 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
1524 {
1525         a1 = ntohs(a1);
1526         a2 = ntohs(a2);
1527         p = ntohs(p);
1528         return (pf_match(op, a1, a2, p));
1529 }
1530
1531 int
1532 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
1533 {
1534         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1535                 return (0);
1536         return (pf_match(op, a1, a2, u));
1537 }
1538
1539 int
1540 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
1541 {
1542         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1543                 return (0);
1544         return (pf_match(op, a1, a2, g));
1545 }
1546
1547 static int
1548 pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_rule *nat_rule,
1549              int *tag)
1550 {
1551         if (*tag == -1) {       /* find mbuf tag */
1552                 if (nat_rule != NULL && nat_rule->tag)
1553                         *tag = nat_rule->tag;
1554                 else if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
1555                         *tag = m->m_pkthdr.pf_tag;
1556                 else
1557                         *tag = 0;
1558         }
1559
1560         return ((!r->match_tag_not && r->match_tag == *tag) ||
1561             (r->match_tag_not && r->match_tag != *tag));
1562 }
1563
1564 void
1565 pf_tag_packet(struct mbuf *m, int tag)
1566 {
1567         if (tag <= 0)
1568                 return;
1569
1570         m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1571         m->m_pkthdr.pf_tag = tag;
1572 }
1573
1574 #define PF_STEP_INTO_ANCHOR(r, a, s, n)                                 \
1575         do {                                                            \
1576                 if ((r) == NULL || (r)->anchor == NULL ||               \
1577                     (s) != NULL || (a) != NULL)                         \
1578                         panic("PF_STEP_INTO_ANCHOR");                   \
1579                 (a) = (r);                                              \
1580                 (s) = TAILQ_FIRST(&(r)->anchor->rulesets);              \
1581                 (r) = NULL;                                             \
1582                 while ((s) != NULL && ((r) =                            \
1583                     TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL)     \
1584                         (s) = TAILQ_NEXT((s), entries);                 \
1585                 if ((r) == NULL) {                                      \
1586                         (r) = TAILQ_NEXT((a), entries);                 \
1587                         (a) = NULL;                                     \
1588                 }                                                       \
1589         } while (0)
1590
1591 #define PF_STEP_OUT_OF_ANCHOR(r, a, s, n)                               \
1592         do {                                                            \
1593                 if ((r) != NULL || (a) == NULL || (s) == NULL)          \
1594                         panic("PF_STEP_OUT_OF_ANCHOR");                 \
1595                 (s) = TAILQ_NEXT((s), entries);                         \
1596                 while ((s) != NULL && ((r) =                            \
1597                     TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL)     \
1598                         (s) = TAILQ_NEXT((s), entries);                 \
1599                 if ((r) == NULL) {                                      \
1600                         (r) = TAILQ_NEXT((a), entries);                 \
1601                         (a) = NULL;                                     \
1602                 }                                                       \
1603         } while (0)
1604
1605 #ifdef INET6
1606 void
1607 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
1608     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
1609 {
1610         switch (af) {
1611 #ifdef INET
1612         case AF_INET:
1613                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
1614                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
1615                 break;
1616 #endif /* INET */
1617         case AF_INET6:
1618                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
1619                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
1620                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
1621                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
1622                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
1623                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
1624                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
1625                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
1626                 break;
1627         }
1628 }
1629
1630 void
1631 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
1632 {
1633         switch (af) {
1634 #ifdef INET
1635         case AF_INET:
1636                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
1637                 break;
1638 #endif /* INET */
1639         case AF_INET6:
1640                 if (addr->addr32[3] == 0xffffffff) {
1641                         addr->addr32[3] = 0;
1642                         if (addr->addr32[2] == 0xffffffff) {
1643                                 addr->addr32[2] = 0;
1644                                 if (addr->addr32[1] == 0xffffffff) {
1645                                         addr->addr32[1] = 0;
1646                                         addr->addr32[0] =
1647                                             htonl(ntohl(addr->addr32[0]) + 1);
1648                                 } else
1649                                         addr->addr32[1] =
1650                                             htonl(ntohl(addr->addr32[1]) + 1);
1651                         } else
1652                                 addr->addr32[2] =
1653                                     htonl(ntohl(addr->addr32[2]) + 1);
1654                 } else
1655                         addr->addr32[3] =
1656                             htonl(ntohl(addr->addr32[3]) + 1);
1657                 break;
1658         }
1659 }
1660 #endif /* INET6 */
1661
1662 #define mix(a,b,c) \
1663         do {                                    \
1664                 a -= b; a -= c; a ^= (c >> 13); \
1665                 b -= c; b -= a; b ^= (a << 8);  \
1666                 c -= a; c -= b; c ^= (b >> 13); \
1667                 a -= b; a -= c; a ^= (c >> 12); \
1668                 b -= c; b -= a; b ^= (a << 16); \
1669                 c -= a; c -= b; c ^= (b >> 5);  \
1670                 a -= b; a -= c; a ^= (c >> 3);  \
1671                 b -= c; b -= a; b ^= (a << 10); \
1672                 c -= a; c -= b; c ^= (b >> 15); \
1673         } while (0)
1674
1675 /*
1676  * hash function based on bridge_hash in if_bridge.c
1677  */
1678 void
1679 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
1680     struct pf_poolhashkey *key, sa_family_t af)
1681 {
1682         u_int32_t       a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
1683
1684         switch (af) {
1685 #ifdef INET
1686         case AF_INET:
1687                 a += inaddr->addr32[0];
1688                 b += key->key32[1];
1689                 mix(a, b, c);
1690                 hash->addr32[0] = c + key->key32[2];
1691                 break;
1692 #endif /* INET */
1693 #ifdef INET6
1694         case AF_INET6:
1695                 a += inaddr->addr32[0];
1696                 b += inaddr->addr32[2];
1697                 mix(a, b, c);
1698                 hash->addr32[0] = c;
1699                 a += inaddr->addr32[1];
1700                 b += inaddr->addr32[3];
1701                 c += key->key32[1];
1702                 mix(a, b, c);
1703                 hash->addr32[1] = c;
1704                 a += inaddr->addr32[2];
1705                 b += inaddr->addr32[1];
1706                 c += key->key32[2];
1707                 mix(a, b, c);
1708                 hash->addr32[2] = c;
1709                 a += inaddr->addr32[3];
1710                 b += inaddr->addr32[0];
1711                 c += key->key32[3];
1712                 mix(a, b, c);
1713                 hash->addr32[3] = c;
1714                 break;
1715 #endif /* INET6 */
1716         }
1717 }
1718
1719 int
1720 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
1721     struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
1722 {
1723         unsigned char            hash[16];
1724         struct pf_pool          *rpool = &r->rpool;
1725         struct pf_addr          *raddr = &rpool->cur->addr.v.a.addr;
1726         struct pf_addr          *rmask = &rpool->cur->addr.v.a.mask;
1727         struct pf_pooladdr      *acur = rpool->cur;
1728         struct pf_src_node       k;
1729
1730         if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
1731             (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
1732                 k.af = af;
1733                 PF_ACPY(&k.addr, saddr, af);
1734                 if (r->rule_flag & PFRULE_RULESRCTRACK ||
1735                     r->rpool.opts & PF_POOL_STICKYADDR)
1736                         k.rule.ptr = r;
1737                 else
1738                         k.rule.ptr = NULL;
1739                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
1740                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
1741                 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
1742                         PF_ACPY(naddr, &(*sn)->raddr, af);
1743                         if (pf_status.debug >= PF_DEBUG_MISC) {
1744                                 kprintf("pf_map_addr: src tracking maps ");
1745                                 pf_print_host(&k.addr, 0, af);
1746                                 kprintf(" to ");
1747                                 pf_print_host(naddr, 0, af);
1748                                 kprintf("\n");
1749                         }
1750                         return (0);
1751                 }
1752         }
1753
1754         if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
1755                 return (1);
1756         if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1757                 if (af == AF_INET) {
1758                         if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
1759                             (rpool->opts & PF_POOL_TYPEMASK) !=
1760                             PF_POOL_ROUNDROBIN)
1761                                 return (1);
1762                          raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
1763                          rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
1764                 } else {
1765                         if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
1766                             (rpool->opts & PF_POOL_TYPEMASK) !=
1767                             PF_POOL_ROUNDROBIN)
1768                                 return (1);
1769                         raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
1770                         rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
1771                 }
1772         } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1773                 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
1774                         return (1); /* unsupported */
1775         } else {
1776                 raddr = &rpool->cur->addr.v.a.addr;
1777                 rmask = &rpool->cur->addr.v.a.mask;
1778         }
1779
1780         switch (rpool->opts & PF_POOL_TYPEMASK) {
1781         case PF_POOL_NONE:
1782                 PF_ACPY(naddr, raddr, af);
1783                 break;
1784         case PF_POOL_BITMASK:
1785                 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
1786                 break;
1787         case PF_POOL_RANDOM:
1788                 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
1789                         switch (af) {
1790 #ifdef INET
1791                         case AF_INET:
1792                                 rpool->counter.addr32[0] = karc4random();
1793                                 break;
1794 #endif /* INET */
1795 #ifdef INET6
1796                         case AF_INET6:
1797                                 if (rmask->addr32[3] != 0xffffffff)
1798                                         rpool->counter.addr32[3] = karc4random();
1799                                 else
1800                                         break;
1801                                 if (rmask->addr32[2] != 0xffffffff)
1802                                         rpool->counter.addr32[2] = karc4random();
1803                                 else
1804                                         break;
1805                                 if (rmask->addr32[1] != 0xffffffff)
1806                                         rpool->counter.addr32[1] = karc4random();
1807                                 else
1808                                         break;
1809                                 if (rmask->addr32[0] != 0xffffffff)
1810                                         rpool->counter.addr32[0] = karc4random();
1811                                 break;
1812 #endif /* INET6 */
1813                         }
1814                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
1815                         PF_ACPY(init_addr, naddr, af);
1816
1817                 } else {
1818                         PF_AINC(&rpool->counter, af);
1819                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
1820                 }
1821                 break;
1822         case PF_POOL_SRCHASH:
1823                 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
1824                 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
1825                 break;
1826         case PF_POOL_ROUNDROBIN:
1827                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1828                         if (!pfr_pool_get(rpool->cur->addr.p.tbl,
1829                             &rpool->tblidx, &rpool->counter,
1830                             &raddr, &rmask, af))
1831                                 goto get_addr;
1832                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1833                         if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
1834                             &rpool->tblidx, &rpool->counter,
1835                             &raddr, &rmask, af))
1836                                 goto get_addr;
1837                 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
1838                         goto get_addr;
1839
1840         try_next:
1841                 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
1842                         rpool->cur = TAILQ_FIRST(&rpool->list);
1843                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1844                         rpool->tblidx = -1;
1845                         if (pfr_pool_get(rpool->cur->addr.p.tbl,
1846                             &rpool->tblidx, &rpool->counter,
1847                             &raddr, &rmask, af)) {
1848                                 /* table contains no address of type 'af' */
1849                                 if (rpool->cur != acur)
1850                                         goto try_next;
1851                                 return (1);
1852                         }
1853                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1854                         rpool->tblidx = -1;
1855                         if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
1856                             &rpool->tblidx, &rpool->counter,
1857                             &raddr, &rmask, af)) {
1858                                 /* table contains no address of type 'af' */
1859                                 if (rpool->cur != acur)
1860                                         goto try_next;
1861                                 return (1);
1862                         }
1863                 } else {
1864                         raddr = &rpool->cur->addr.v.a.addr;
1865                         rmask = &rpool->cur->addr.v.a.mask;
1866                         PF_ACPY(&rpool->counter, raddr, af);
1867                 }
1868
1869         get_addr:
1870                 PF_ACPY(naddr, &rpool->counter, af);
1871                 PF_AINC(&rpool->counter, af);
1872                 break;
1873         }
1874         if (*sn != NULL)
1875                 PF_ACPY(&(*sn)->raddr, naddr, af);
1876
1877         if (pf_status.debug >= PF_DEBUG_MISC &&
1878             (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
1879                 kprintf("pf_map_addr: selected address ");
1880                 pf_print_host(naddr, 0, af);
1881                 kprintf("\n");
1882         }
1883
1884         return (0);
1885 }
1886
1887 int
1888 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
1889     struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
1890     struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
1891     struct pf_src_node **sn)
1892 {
1893         struct pf_state         key;
1894         struct pf_addr          init_addr;
1895         u_int16_t               cut;
1896
1897         bzero(&init_addr, sizeof(init_addr));
1898         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
1899                 return (1);
1900
1901         do {
1902                 key.af = af;
1903                 key.proto = proto;
1904                 PF_ACPY(&key.ext.addr, daddr, key.af);
1905                 PF_ACPY(&key.gwy.addr, naddr, key.af);
1906                 key.ext.port = dport;
1907
1908                 /*
1909                  * port search; start random, step;
1910                  * similar 2 portloop in in_pcbbind
1911                  */
1912                 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP)) {
1913                         key.gwy.port = 0;
1914                         if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
1915                                 return (0);
1916                 } else if (low == 0 && high == 0) {
1917                         key.gwy.port = *nport;
1918                         if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
1919                                 return (0);
1920                 } else if (low == high) {
1921                         key.gwy.port = htons(low);
1922                         if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) {
1923                                 *nport = htons(low);
1924                                 return (0);
1925                         }
1926                 } else {
1927                         u_int16_t tmp;
1928
1929                         if (low > high) {
1930                                 tmp = low;
1931                                 low = high;
1932                                 high = tmp;
1933                         }
1934                         /* low < high */
1935                         cut = karc4random() % (1 + high - low) + low;
1936                         /* low <= cut <= high */
1937                         for (tmp = cut; tmp <= high; ++(tmp)) {
1938                                 key.gwy.port = htons(tmp);
1939                                 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
1940                                     NULL) {
1941                                         *nport = htons(tmp);
1942                                         return (0);
1943                                 }
1944                         }
1945                         for (tmp = cut - 1; tmp >= low; --(tmp)) {
1946                                 key.gwy.port = htons(tmp);
1947                                 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
1948                                     NULL) {
1949                                         *nport = htons(tmp);
1950                                         return (0);
1951                                 }
1952                         }
1953                 }
1954
1955                 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
1956                 case PF_POOL_RANDOM:
1957                 case PF_POOL_ROUNDROBIN:
1958                         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
1959                                 return (1);
1960                         break;
1961                 case PF_POOL_NONE:
1962                 case PF_POOL_SRCHASH:
1963                 case PF_POOL_BITMASK:
1964                 default:
1965                         return (1);
1966                 }
1967         } while (! PF_AEQ(&init_addr, naddr, af) );
1968
1969         return (1);                                     /* none available */
1970 }
1971
1972 struct pf_rule *
1973 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
1974     int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
1975     struct pf_addr *daddr, u_int16_t dport, int rs_num)
1976 {
1977         struct pf_rule          *r, *rm = NULL, *anchorrule = NULL;
1978         struct pf_ruleset       *ruleset = NULL;
1979
1980         r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
1981         while (r && rm == NULL) {
1982                 struct pf_rule_addr     *src = NULL, *dst = NULL;
1983                 struct pf_addr_wrap     *xdst = NULL;
1984
1985                 if (r->action == PF_BINAT && direction == PF_IN) {
1986                         src = &r->dst;
1987                         if (r->rpool.cur != NULL)
1988                                 xdst = &r->rpool.cur->addr;
1989                 } else {
1990                         src = &r->src;
1991                         dst = &r->dst;
1992                 }
1993
1994                 r->evaluations++;
1995                 if (r->kif != NULL &&
1996                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
1997                         r = r->skip[PF_SKIP_IFP].ptr;
1998                 else if (r->direction && r->direction != direction)
1999                         r = r->skip[PF_SKIP_DIR].ptr;
2000                 else if (r->af && r->af != pd->af)
2001                         r = r->skip[PF_SKIP_AF].ptr;
2002                 else if (r->proto && r->proto != pd->proto)
2003                         r = r->skip[PF_SKIP_PROTO].ptr;
2004                 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->not))
2005                         r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
2006                             PF_SKIP_DST_ADDR].ptr;
2007                 else if (src->port_op && !pf_match_port(src->port_op,
2008                     src->port[0], src->port[1], sport))
2009                         r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
2010                             PF_SKIP_DST_PORT].ptr;
2011                 else if (dst != NULL &&
2012                     PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->not))
2013                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2014                 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0))
2015                         r = TAILQ_NEXT(r, entries);
2016                 else if (dst != NULL && dst->port_op &&
2017                     !pf_match_port(dst->port_op, dst->port[0],
2018                     dst->port[1], dport))
2019                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2020                 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2021                     IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2022                     off, pd->hdr.tcp), r->os_fingerprint)))
2023                         r = TAILQ_NEXT(r, entries);
2024                 else if (r->anchorname[0] && r->anchor == NULL)
2025                         r = TAILQ_NEXT(r, entries);
2026                 else if (r->anchor == NULL)
2027                                 rm = r;
2028                 else
2029                         PF_STEP_INTO_ANCHOR(r, anchorrule, ruleset, rs_num);
2030                 if (r == NULL && anchorrule != NULL)
2031                         PF_STEP_OUT_OF_ANCHOR(r, anchorrule, ruleset,
2032                             rs_num);
2033         }
2034         if (rm != NULL && (rm->action == PF_NONAT ||
2035             rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2036                 return (NULL);
2037         return (rm);
2038 }
2039
2040 struct pf_rule *
2041 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2042     struct pfi_kif *kif, struct pf_src_node **sn,
2043     struct pf_addr *saddr, u_int16_t sport,
2044     struct pf_addr *daddr, u_int16_t dport,
2045     struct pf_addr *naddr, u_int16_t *nport)
2046 {
2047         struct pf_rule  *r = NULL;
2048
2049         if (direction == PF_OUT) {
2050                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2051                     sport, daddr, dport, PF_RULESET_BINAT);
2052                 if (r == NULL)
2053                         r = pf_match_translation(pd, m, off, direction, kif,
2054                             saddr, sport, daddr, dport, PF_RULESET_NAT);
2055         } else {
2056                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2057                     sport, daddr, dport, PF_RULESET_RDR);
2058                 if (r == NULL)
2059                         r = pf_match_translation(pd, m, off, direction, kif,
2060                             saddr, sport, daddr, dport, PF_RULESET_BINAT);
2061         }
2062
2063         if (r != NULL) {
2064                 switch (r->action) {
2065                 case PF_NONAT:
2066                 case PF_NOBINAT:
2067                 case PF_NORDR:
2068                         return (NULL);
2069                 case PF_NAT:
2070                         if (pf_get_sport(pd->af, pd->proto, r, saddr,
2071                             daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2072                             r->rpool.proxy_port[1], sn)) {
2073                                 DPFPRINTF(PF_DEBUG_MISC,
2074                                     ("pf: NAT proxy port allocation "
2075                                     "(%u-%u) failed\n",
2076                                     r->rpool.proxy_port[0],
2077                                     r->rpool.proxy_port[1]));
2078                                 return (NULL);
2079                         }
2080                         break;
2081                 case PF_BINAT:
2082                         switch (direction) {
2083                         case PF_OUT:
2084                                 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
2085                                         if (pd->af == AF_INET) {
2086                                                 if (r->rpool.cur->addr.p.dyn->
2087                                                     pfid_acnt4 < 1)
2088                                                         return (NULL);
2089                                                 PF_POOLMASK(naddr,
2090                                                     &r->rpool.cur->addr.p.dyn->
2091                                                     pfid_addr4,
2092                                                     &r->rpool.cur->addr.p.dyn->
2093                                                     pfid_mask4,
2094                                                     saddr, AF_INET);
2095                                         } else {
2096                                                 if (r->rpool.cur->addr.p.dyn->
2097                                                     pfid_acnt6 < 1)
2098                                                         return (NULL);
2099                                                 PF_POOLMASK(naddr,
2100                                                     &r->rpool.cur->addr.p.dyn->
2101                                                     pfid_addr6,
2102                                                     &r->rpool.cur->addr.p.dyn->
2103                                                     pfid_mask6,
2104                                                     saddr, AF_INET6);
2105                                         }
2106                                 } else
2107                                         PF_POOLMASK(naddr,
2108                                             &r->rpool.cur->addr.v.a.addr,
2109                                             &r->rpool.cur->addr.v.a.mask,
2110                                             saddr, pd->af);
2111                                 break;
2112                         case PF_IN:
2113                                 if (r->src.addr.type == PF_ADDR_DYNIFTL){
2114                                         if (pd->af == AF_INET) {
2115                                                 if (r->src.addr.p.dyn->
2116                                                     pfid_acnt4 < 1)
2117                                                         return (NULL);
2118                                                 PF_POOLMASK(naddr,
2119                                                     &r->src.addr.p.dyn->
2120                                                     pfid_addr4,
2121                                                     &r->src.addr.p.dyn->
2122                                                     pfid_mask4,
2123                                                     daddr, AF_INET);
2124                                         } else {
2125                                                 if (r->src.addr.p.dyn->
2126                                                     pfid_acnt6 < 1)
2127                                                         return (NULL);
2128                                                 PF_POOLMASK(naddr,
2129                                                     &r->src.addr.p.dyn->
2130                                                     pfid_addr6,
2131                                                     &r->src.addr.p.dyn->
2132                                                     pfid_mask6,
2133                                                     daddr, AF_INET6);
2134                                         }
2135                                 } else
2136                                         PF_POOLMASK(naddr,
2137                                             &r->src.addr.v.a.addr,
2138                                             &r->src.addr.v.a.mask, daddr,
2139                                             pd->af);
2140                                 break;
2141                         }
2142                         break;
2143                 case PF_RDR: {
2144                         if (pf_map_addr(r->af, r, saddr, naddr, NULL, sn))
2145                                 return (NULL);
2146
2147                         if (r->rpool.proxy_port[1]) {
2148                                 u_int32_t       tmp_nport;
2149
2150                                 tmp_nport = ((ntohs(dport) -
2151                                     ntohs(r->dst.port[0])) %
2152                                     (r->rpool.proxy_port[1] -
2153                                     r->rpool.proxy_port[0] + 1)) +
2154                                     r->rpool.proxy_port[0];
2155
2156                                 /* wrap around if necessary */
2157                                 if (tmp_nport > 65535)
2158                                         tmp_nport -= 65535;
2159                                 *nport = htons((u_int16_t)tmp_nport);
2160                         } else if (r->rpool.proxy_port[0])
2161                                 *nport = htons(r->rpool.proxy_port[0]);
2162                         break;
2163                 }
2164                 default:
2165                         return (NULL);
2166                 }
2167         }
2168
2169         return (r);
2170 }
2171
2172 #ifdef SMP
2173 struct netmsg_hashlookup {
2174         struct netmsg           nm_netmsg;
2175         struct inpcb            **nm_pinp;
2176         struct inpcbinfo        *nm_pcbinfo;
2177         struct pf_addr          *nm_saddr;
2178         struct pf_addr          *nm_daddr;
2179         uint16_t                nm_sport;
2180         uint16_t                nm_dport;
2181         sa_family_t             nm_af;
2182 };
2183
2184 static void
2185 in_pcblookup_hash_handler(struct netmsg *msg0)
2186 {
2187         struct netmsg_hashlookup *msg = (struct netmsg_hashlookup *)msg0;
2188
2189         if (msg->nm_af == AF_INET)
2190                 *msg->nm_pinp = in_pcblookup_hash(msg->nm_pcbinfo,
2191                     msg->nm_saddr->v4, msg->nm_sport, msg->nm_daddr->v4,
2192                     msg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2193 #ifdef INET6
2194         else
2195                 *msg->nm_pinp = in6_pcblookup_hash(msg->nm_pcbinfo,
2196                     &msg->nm_saddr->v6, msg->nm_sport, &msg->nm_daddr->v6,
2197                     msg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2198 #endif /* INET6 */
2199         lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, 0);
2200 }
2201 #endif /* SMP */
2202
2203 int
2204 pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd)
2205 {
2206         struct pf_addr          *saddr, *daddr;
2207         u_int16_t                sport, dport;
2208         struct inpcbinfo        *pi;
2209         struct inpcb            *inp;
2210 #ifdef SMP
2211         struct netmsg_hashlookup *msg = NULL;
2212 #endif
2213         int                      pi_cpu = 0;
2214
2215         *uid = UID_MAX;
2216         *gid = GID_MAX;
2217         if (direction == PF_IN) {
2218                 saddr = pd->src;
2219                 daddr = pd->dst;
2220         } else {
2221                 saddr = pd->dst;
2222                 daddr = pd->src;
2223         }
2224         switch (pd->proto) {
2225         case IPPROTO_TCP:
2226                 sport = pd->hdr.tcp->th_sport;
2227                 dport = pd->hdr.tcp->th_dport;
2228
2229                 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2230                 pi = &tcbinfo[pi_cpu];
2231 #ifdef SMP
2232                 /*
2233                  * Our netstack runs lockless on MP systems
2234                  * (only for TCP connections at the moment).
2235                  *
2236                  * As we are not allowed to read another CPU's tcbinfo,
2237                  * we have to ask that CPU via remote call to search the
2238                  * table for us.
2239                  *
2240                  * Prepare a msg iff data belongs to another CPU.
2241                  */
2242                 if (pi_cpu != mycpu->gd_cpuid) {
2243                         msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_INTWAIT);
2244                         netmsg_init(&msg->nm_netmsg, &netisr_afree_rport, 0,
2245                                     in_pcblookup_hash_handler);
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),
2300                                      &msg->nm_netmsg.nm_lmsg);
2301                 } else
2302 #endif /* SMP */
2303                 {
2304                         inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2305                             dport, INPLOOKUP_WILDCARD, NULL);
2306                 }
2307                 if (inp == NULL)
2308                         return (0);
2309                 break;
2310
2311         default:
2312                 return (0);
2313         }
2314         *uid = inp->inp_socket->so_cred->cr_uid;
2315         *gid = inp->inp_socket->so_cred->cr_groups[0];
2316         return (1);
2317 }
2318
2319 u_int8_t
2320 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2321 {
2322         int              hlen;
2323         u_int8_t         hdr[60];
2324         u_int8_t        *opt, optlen;
2325         u_int8_t         wscale = 0;
2326
2327         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
2328         if (hlen <= sizeof(struct tcphdr))
2329                 return (0);
2330         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2331                 return (0);
2332         opt = hdr + sizeof(struct tcphdr);
2333         hlen -= sizeof(struct tcphdr);
2334         while (hlen >= 3) {
2335                 switch (*opt) {
2336                 case TCPOPT_EOL:
2337                 case TCPOPT_NOP:
2338                         ++opt;
2339                         --hlen;
2340                         break;
2341                 case TCPOPT_WINDOW:
2342                         wscale = opt[2];
2343                         if (wscale > TCP_MAX_WINSHIFT)
2344                                 wscale = TCP_MAX_WINSHIFT;
2345                         wscale |= PF_WSCALE_FLAG;
2346                         /* FALLTHROUGH */
2347                 default:
2348                         optlen = opt[1];
2349                         if (optlen < 2)
2350                                 optlen = 2;
2351                         hlen -= optlen;
2352                         opt += optlen;
2353                         break;
2354                 }
2355         }
2356         return (wscale);
2357 }
2358
2359 u_int16_t
2360 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2361 {
2362         int              hlen;
2363         u_int8_t         hdr[60];
2364         u_int8_t        *opt, optlen;
2365         u_int16_t        mss = tcp_mssdflt;
2366
2367         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
2368         if (hlen <= sizeof(struct tcphdr))
2369                 return (0);
2370         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2371                 return (0);
2372         opt = hdr + sizeof(struct tcphdr);
2373         hlen -= sizeof(struct tcphdr);
2374         while (hlen >= TCPOLEN_MAXSEG) {
2375                 switch (*opt) {
2376                 case TCPOPT_EOL:
2377                 case TCPOPT_NOP:
2378                         ++opt;
2379                         --hlen;
2380                         break;
2381                 case TCPOPT_MAXSEG:
2382                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
2383                         /* FALLTHROUGH */
2384                 default:
2385                         optlen = opt[1];
2386                         if (optlen < 2)
2387                                 optlen = 2;
2388                         hlen -= optlen;
2389                         opt += optlen;
2390                         break;
2391                 }
2392         }
2393         return (mss);
2394 }
2395
2396 u_int16_t
2397 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
2398 {
2399 #ifdef INET
2400         struct sockaddr_in      *dst;
2401         struct route             ro;
2402 #endif /* INET */
2403 #ifdef INET6
2404         struct sockaddr_in6     *dst6;
2405         struct route_in6         ro6;
2406 #endif /* INET6 */
2407         struct rtentry          *rt = NULL;
2408         int                      hlen = 0;
2409         u_int16_t                mss = tcp_mssdflt;
2410
2411         switch (af) {
2412 #ifdef INET
2413         case AF_INET:
2414                 hlen = sizeof(struct ip);
2415                 bzero(&ro, sizeof(ro));
2416                 dst = (struct sockaddr_in *)&ro.ro_dst;
2417                 dst->sin_family = AF_INET;
2418                 dst->sin_len = sizeof(*dst);
2419                 dst->sin_addr = addr->v4;
2420                 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
2421                 rt = ro.ro_rt;
2422                 break;
2423 #endif /* INET */
2424 #ifdef INET6
2425         case AF_INET6:
2426                 hlen = sizeof(struct ip6_hdr);
2427                 bzero(&ro6, sizeof(ro6));
2428                 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
2429                 dst6->sin6_family = AF_INET6;
2430                 dst6->sin6_len = sizeof(*dst6);
2431                 dst6->sin6_addr = addr->v6;
2432                 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
2433                 rt = ro6.ro_rt;
2434                 break;
2435 #endif /* INET6 */
2436         }
2437
2438         if (rt && rt->rt_ifp) {
2439                 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
2440                 mss = max(tcp_mssdflt, mss);
2441                 RTFREE(rt);
2442         }
2443         mss = min(mss, offer);
2444         mss = max(mss, 64);             /* sanity - at least max opt space */
2445         return (mss);
2446 }
2447
2448 void
2449 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
2450 {
2451         struct pf_rule *r = s->rule.ptr;
2452
2453         s->rt_kif = NULL;
2454         if (!r->rt || r->rt == PF_FASTROUTE)
2455                 return;
2456         switch (s->af) {
2457 #ifdef INET
2458         case AF_INET:
2459                 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
2460                     &s->nat_src_node);
2461                 s->rt_kif = r->rpool.cur->kif;
2462                 break;
2463 #endif /* INET */
2464 #ifdef INET6
2465         case AF_INET6:
2466                 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
2467                     &s->nat_src_node);
2468                 s->rt_kif = r->rpool.cur->kif;
2469                 break;
2470 #endif /* INET6 */
2471         }
2472 }
2473
2474 int
2475 pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction,
2476     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2477     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
2478 {
2479         struct pf_rule          *nr = NULL;
2480         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
2481         struct tcphdr           *th = pd->hdr.tcp;
2482         u_int16_t                bport, nport = 0;
2483         sa_family_t              af = pd->af;
2484         int                      lookup = -1;
2485         uid_t                    uid;
2486         gid_t                    gid;
2487         struct pf_rule          *r, *a = NULL;
2488         struct pf_ruleset       *ruleset = NULL;
2489         struct pf_src_node      *nsn = NULL;
2490         u_short                  reason;
2491         int                      rewrite = 0;
2492         int                      tag = -1;
2493         u_int16_t                mss = tcp_mssdflt;
2494
2495         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2496
2497         if (direction == PF_OUT) {
2498                 bport = nport = th->th_sport;
2499                 /* check outgoing packet for BINAT/NAT */
2500                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2501                     saddr, th->th_sport, daddr, th->th_dport,
2502                     &pd->naddr, &nport)) != NULL) {
2503                         PF_ACPY(&pd->baddr, saddr, af);
2504                         pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
2505                             &th->th_sum, &pd->naddr, nport, 0, af);
2506                         rewrite++;
2507                         if (nr->natpass)
2508                                 r = NULL;
2509                         pd->nat_rule = nr;
2510                 }
2511         } else {
2512                 bport = nport = th->th_dport;
2513                 /* check incoming packet for BINAT/RDR */
2514                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
2515                     saddr, th->th_sport, daddr, th->th_dport,
2516                     &pd->naddr, &nport)) != NULL) {
2517                         PF_ACPY(&pd->baddr, daddr, af);
2518                         pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
2519                             &th->th_sum, &pd->naddr, nport, 0, af);
2520                         rewrite++;
2521                         if (nr->natpass)
2522                                 r = NULL;
2523                         pd->nat_rule = nr;
2524                 }
2525         }
2526
2527         while (r != NULL) {
2528                 r->evaluations++;
2529                 if (r->kif != NULL &&
2530                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
2531                         r = r->skip[PF_SKIP_IFP].ptr;
2532                 else if (r->direction && r->direction != direction)
2533                         r = r->skip[PF_SKIP_DIR].ptr;
2534                 else if (r->af && r->af != af)
2535                         r = r->skip[PF_SKIP_AF].ptr;
2536                 else if (r->proto && r->proto != IPPROTO_TCP)
2537                         r = r->skip[PF_SKIP_PROTO].ptr;
2538                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
2539                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
2540                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
2541                     r->src.port[0], r->src.port[1], th->th_sport))
2542                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
2543                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
2544                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2545                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
2546                     r->dst.port[0], r->dst.port[1], th->th_dport))
2547                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2548                 else if (r->tos && !(r->tos & pd->tos))
2549                         r = TAILQ_NEXT(r, entries);
2550                 else if (r->rule_flag & PFRULE_FRAGMENT)
2551                         r = TAILQ_NEXT(r, entries);
2552                 else if ((r->flagset & th->th_flags) != r->flags)
2553                         r = TAILQ_NEXT(r, entries);
2554                 else if (r->uid.op && (lookup != -1 || (lookup =
2555                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2556                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
2557                     uid))
2558                         r = TAILQ_NEXT(r, entries);
2559                 else if (r->gid.op && (lookup != -1 || (lookup =
2560                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2561                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
2562                     gid))
2563                         r = TAILQ_NEXT(r, entries);
2564                 else if (r->prob && r->prob <= karc4random())
2565                         r = TAILQ_NEXT(r, entries);
2566                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
2567                         r = TAILQ_NEXT(r, entries);
2568                 else if (r->anchorname[0] && r->anchor == NULL)
2569                         r = TAILQ_NEXT(r, entries);
2570                 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match(
2571                     pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint))
2572                         r = TAILQ_NEXT(r, entries);
2573                 else {
2574                         if (r->tag)
2575                                 tag = r->tag;
2576                         if (r->anchor == NULL) {
2577                                 *rm = r;
2578                                 *am = a;
2579                                 *rsm = ruleset;
2580                                 if ((*rm)->quick)
2581                                         break;
2582                                 r = TAILQ_NEXT(r, entries);
2583                         } else
2584                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
2585                                     PF_RULESET_FILTER);
2586                 }
2587                 if (r == NULL && a != NULL)
2588                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
2589                             PF_RULESET_FILTER);
2590         }
2591         r = *rm;
2592         a = *am;
2593         ruleset = *rsm;
2594
2595         REASON_SET(&reason, PFRES_MATCH);
2596
2597         if (r->log) {
2598                 if (rewrite)
2599                         m_copyback(m, off, sizeof(*th), (caddr_t)th);
2600                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
2601         }
2602
2603         if ((r->action == PF_DROP) &&
2604             ((r->rule_flag & PFRULE_RETURNRST) ||
2605             (r->rule_flag & PFRULE_RETURNICMP) ||
2606             (r->rule_flag & PFRULE_RETURN))) {
2607                 /* undo NAT changes, if they have taken place */
2608                 if (nr != NULL) {
2609                         if (direction == PF_OUT) {
2610                                 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
2611                                     &th->th_sum, &pd->baddr, bport, 0, af);
2612                                 rewrite++;
2613                         } else {
2614                                 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
2615                                     &th->th_sum, &pd->baddr, bport, 0, af);
2616                                 rewrite++;
2617                         }
2618                 }
2619                 if (((r->rule_flag & PFRULE_RETURNRST) ||
2620                     (r->rule_flag & PFRULE_RETURN)) &&
2621                     !(th->th_flags & TH_RST)) {
2622                         u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
2623
2624                         if (th->th_flags & TH_SYN)
2625                                 ack++;
2626                         if (th->th_flags & TH_FIN)
2627                                 ack++;
2628                         pf_send_tcp(r, af, pd->dst,
2629                             pd->src, th->th_dport, th->th_sport,
2630                             ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
2631                             r->return_ttl);
2632                 } else if ((af == AF_INET) && r->return_icmp)
2633                         pf_send_icmp(m, r->return_icmp >> 8,
2634                             r->return_icmp & 255, af, r);
2635                 else if ((af == AF_INET6) && r->return_icmp6)
2636                         pf_send_icmp(m, r->return_icmp6 >> 8,
2637                             r->return_icmp6 & 255, af, r);
2638         }
2639
2640         if (r->action == PF_DROP)
2641                 return (PF_DROP);
2642
2643         pf_tag_packet(m, tag);
2644
2645         if (r->keep_state || nr != NULL ||
2646             (pd->flags & PFDESC_TCP_NORM)) {
2647                 /* create new state */
2648                 u_int16_t        len;
2649                 struct pf_state *s = NULL;
2650                 struct pf_src_node *sn = NULL;
2651
2652                 len = pd->tot_len - off - (th->th_off << 2);
2653
2654                 /* check maximums */
2655                 if (r->max_states && (r->states >= r->max_states))
2656                         goto cleanup;
2657                 /* src node for flter rule */
2658                 if ((r->rule_flag & PFRULE_SRCTRACK ||
2659                     r->rpool.opts & PF_POOL_STICKYADDR) &&
2660                     pf_insert_src_node(&sn, r, saddr, af) != 0)
2661                         goto cleanup;
2662                 /* src node for translation rule */
2663                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
2664                     ((direction == PF_OUT &&
2665                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
2666                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
2667                         goto cleanup;
2668                 s = pool_get(&pf_state_pl, PR_NOWAIT);
2669                 if (s == NULL) {
2670 cleanup:
2671                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
2672                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
2673                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2674                                 pf_status.src_nodes--;
2675                                 pool_put(&pf_src_tree_pl, sn);
2676                         }
2677                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
2678                             nsn->expire == 0) {
2679                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
2680                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2681                                 pf_status.src_nodes--;
2682                                 pool_put(&pf_src_tree_pl, nsn);
2683                         }
2684                         REASON_SET(&reason, PFRES_MEMORY);
2685                         return (PF_DROP);
2686                 }
2687                 bzero(s, sizeof(*s));
2688                 r->states++;
2689                 if (a != NULL)
2690                         a->states++;
2691                 s->rule.ptr = r;
2692                 s->nat_rule.ptr = nr;
2693                 if (s->nat_rule.ptr != NULL)
2694                         s->nat_rule.ptr->states++;
2695                 s->anchor.ptr = a;
2696                 s->allow_opts = r->allow_opts;
2697                 s->log = r->log & 2;
2698                 s->proto = IPPROTO_TCP;
2699                 s->direction = direction;
2700                 s->af = af;
2701                 if (direction == PF_OUT) {
2702                         PF_ACPY(&s->gwy.addr, saddr, af);
2703                         s->gwy.port = th->th_sport;             /* sport */
2704                         PF_ACPY(&s->ext.addr, daddr, af);
2705                         s->ext.port = th->th_dport;
2706                         if (nr != NULL) {
2707                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
2708                                 s->lan.port = bport;
2709                         } else {
2710                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
2711                                 s->lan.port = s->gwy.port;
2712                         }
2713                 } else {
2714                         PF_ACPY(&s->lan.addr, daddr, af);
2715                         s->lan.port = th->th_dport;
2716                         PF_ACPY(&s->ext.addr, saddr, af);
2717                         s->ext.port = th->th_sport;
2718                         if (nr != NULL) {
2719                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
2720                                 s->gwy.port = bport;
2721                         } else {
2722                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
2723                                 s->gwy.port = s->lan.port;
2724                         }
2725                 }
2726
2727                 s->src.seqlo = ntohl(th->th_seq);
2728                 s->src.seqhi = s->src.seqlo + len + 1;
2729                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2730                     r->keep_state == PF_STATE_MODULATE) {
2731                         /* Generate sequence number modulator */
2732                         while ((s->src.seqdiff = karc4random()) == 0)
2733                                 ;
2734                         pf_change_a(&th->th_seq, &th->th_sum,
2735                             htonl(s->src.seqlo + s->src.seqdiff), 0);
2736                         rewrite = 1;
2737                 } else
2738                         s->src.seqdiff = 0;
2739                 s->src.max_win = MAX(ntohs(th->th_win), 1);
2740                 if (th->th_flags & TH_SYN) {
2741                         s->src.seqhi++;
2742                         s->src.wscale = pf_get_wscale(m, off, th->th_off, af);
2743                 } else if (s->src.wscale & PF_WSCALE_MASK) {
2744                         /* Remove scale factor from initial window */
2745                         u_int win = s->src.max_win;
2746                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
2747                         s->src.max_win = (win - 1) >>
2748                             (s->src.wscale & PF_WSCALE_MASK);
2749                 }
2750                 if (th->th_flags & TH_FIN)
2751                         s->src.seqhi++;
2752                 s->dst.seqhi = 1;
2753                 s->dst.max_win = 1;
2754                 s->src.state = TCPS_SYN_SENT;
2755                 s->dst.state = TCPS_CLOSED;
2756                 s->creation = time_second;
2757                 s->expire = time_second;
2758                 s->timeout = PFTM_TCP_FIRST_PACKET;
2759                 pf_set_rt_ifp(s, saddr);
2760                 if (sn != NULL) {
2761                         s->src_node = sn;
2762                         s->src_node->states++;
2763                 }
2764                 if (nsn != NULL) {
2765                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
2766                         s->nat_src_node = nsn;
2767                         s->nat_src_node->states++;
2768                 }
2769                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
2770                     off, pd, th, &s->src, &s->dst)) {
2771                         REASON_SET(&reason, PFRES_MEMORY);
2772                         pf_src_tree_remove_state(s);
2773                         pool_put(&pf_state_pl, s);
2774                         return (PF_DROP);
2775                 }
2776                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
2777                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, &s->src,
2778                     &s->dst, &rewrite)) {
2779                         pf_normalize_tcp_cleanup(s);
2780                         pf_src_tree_remove_state(s);
2781                         pool_put(&pf_state_pl, s);
2782                         return (PF_DROP);
2783                 }
2784                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
2785                         pf_normalize_tcp_cleanup(s);
2786                         REASON_SET(&reason, PFRES_MEMORY);
2787                         pf_src_tree_remove_state(s);
2788                         pool_put(&pf_state_pl, s);
2789                         return (PF_DROP);
2790                 } else
2791                         *sm = s;
2792                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2793                     r->keep_state == PF_STATE_SYNPROXY) {
2794                         s->src.state = PF_TCPS_PROXY_SRC;
2795                         if (nr != NULL) {
2796                                 if (direction == PF_OUT) {
2797                                         pf_change_ap(saddr, &th->th_sport,
2798                                             pd->ip_sum, &th->th_sum, &pd->baddr,
2799                                             bport, 0, af);
2800                                 } else {
2801                                         pf_change_ap(daddr, &th->th_dport,
2802                                             pd->ip_sum, &th->th_sum, &pd->baddr,
2803                                             bport, 0, af);
2804                                 }
2805                         }
2806                         s->src.seqhi = karc4random();
2807                         /* Find mss option */
2808                         mss = pf_get_mss(m, off, th->th_off, af);
2809                         mss = pf_calc_mss(saddr, af, mss);
2810                         mss = pf_calc_mss(daddr, af, mss);
2811                         s->src.mss = mss;
2812                         pf_send_tcp(r, af, daddr, saddr, th->th_dport,
2813                             th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
2814                             TH_SYN|TH_ACK, 0, s->src.mss, 0);
2815                         return (PF_SYNPROXY_DROP);
2816                 }
2817         }
2818
2819         /* copy back packet headers if we performed NAT operations */
2820         if (rewrite)
2821                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
2822
2823         return (PF_PASS);
2824 }
2825
2826 int
2827 pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction,
2828     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2829     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
2830 {
2831         struct pf_rule          *nr = NULL;
2832         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
2833         struct udphdr           *uh = pd->hdr.udp;
2834         u_int16_t                bport, nport = 0;
2835         sa_family_t              af = pd->af;
2836         int                      lookup = -1;
2837         uid_t                    uid;
2838         gid_t                    gid;
2839         struct pf_rule          *r, *a = NULL;
2840         struct pf_ruleset       *ruleset = NULL;
2841         struct pf_src_node      *nsn = NULL;
2842         u_short                  reason;
2843         int                      rewrite = 0;
2844         int                      tag = -1;
2845
2846         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2847
2848         if (direction == PF_OUT) {
2849                 bport = nport = uh->uh_sport;
2850                 /* check outgoing packet for BINAT/NAT */
2851                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2852                     saddr, uh->uh_sport, daddr, uh->uh_dport,
2853                     &pd->naddr, &nport)) != NULL) {
2854                         PF_ACPY(&pd->baddr, saddr, af);
2855                         pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2856                             &uh->uh_sum, &pd->naddr, nport, 1, af);
2857                         rewrite++;
2858                         if (nr->natpass)
2859                                 r = NULL;
2860                         pd->nat_rule = nr;
2861                 }
2862         } else {
2863                 bport = nport = uh->uh_dport;
2864                 /* check incoming packet for BINAT/RDR */
2865                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
2866                     saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr,
2867                     &nport)) != NULL) {
2868                         PF_ACPY(&pd->baddr, daddr, af);
2869                         pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2870                             &uh->uh_sum, &pd->naddr, nport, 1, af);
2871                         rewrite++;
2872                         if (nr->natpass)
2873                                 r = NULL;
2874                         pd->nat_rule = nr;
2875                 }
2876         }
2877
2878         while (r != NULL) {
2879                 r->evaluations++;
2880                 if (r->kif != NULL &&
2881                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
2882                         r = r->skip[PF_SKIP_IFP].ptr;
2883                 else if (r->direction && r->direction != direction)
2884                         r = r->skip[PF_SKIP_DIR].ptr;
2885                 else if (r->af && r->af != af)
2886                         r = r->skip[PF_SKIP_AF].ptr;
2887                 else if (r->proto && r->proto != IPPROTO_UDP)
2888                         r = r->skip[PF_SKIP_PROTO].ptr;
2889                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
2890                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
2891                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
2892                     r->src.port[0], r->src.port[1], uh->uh_sport))
2893                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
2894                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
2895                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2896                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
2897                     r->dst.port[0], r->dst.port[1], uh->uh_dport))
2898                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2899                 else if (r->tos && !(r->tos & pd->tos))
2900                         r = TAILQ_NEXT(r, entries);
2901                 else if (r->rule_flag & PFRULE_FRAGMENT)
2902                         r = TAILQ_NEXT(r, entries);
2903                 else if (r->uid.op && (lookup != -1 || (lookup =
2904                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2905                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
2906                     uid))
2907                         r = TAILQ_NEXT(r, entries);
2908                 else if (r->gid.op && (lookup != -1 || (lookup =
2909                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2910                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
2911                     gid))
2912                         r = TAILQ_NEXT(r, entries);
2913                 else if (r->prob && r->prob <= karc4random())
2914                         r = TAILQ_NEXT(r, entries);
2915                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
2916                         r = TAILQ_NEXT(r, entries);
2917                 else if (r->anchorname[0] && r->anchor == NULL)
2918                         r = TAILQ_NEXT(r, entries);
2919                 else if (r->os_fingerprint != PF_OSFP_ANY)
2920                         r = TAILQ_NEXT(r, entries);
2921                 else {
2922                         if (r->tag)
2923                                 tag = r->tag;
2924                         if (r->anchor == NULL) {
2925                                 *rm = r;
2926                                 *am = a;
2927                                 *rsm = ruleset;
2928                                 if ((*rm)->quick)
2929                                         break;
2930                                 r = TAILQ_NEXT(r, entries);
2931                         } else
2932                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
2933                                     PF_RULESET_FILTER);
2934                 }
2935                 if (r == NULL && a != NULL)
2936                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
2937                             PF_RULESET_FILTER);
2938         }
2939         r = *rm;
2940         a = *am;
2941         ruleset = *rsm;
2942
2943         REASON_SET(&reason, PFRES_MATCH);
2944
2945         if (r->log) {
2946                 if (rewrite)
2947                         m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
2948                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
2949         }
2950
2951         if ((r->action == PF_DROP) &&
2952             ((r->rule_flag & PFRULE_RETURNICMP) ||
2953             (r->rule_flag & PFRULE_RETURN))) {
2954                 /* undo NAT changes, if they have taken place */
2955                 if (nr != NULL) {
2956                         if (direction == PF_OUT) {
2957                                 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2958                                     &uh->uh_sum, &pd->baddr, bport, 1, af);
2959                                 rewrite++;
2960                         } else {
2961                                 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2962                                     &uh->uh_sum, &pd->baddr, bport, 1, af);
2963                                 rewrite++;
2964                         }
2965                 }
2966                 if ((af == AF_INET) && r->return_icmp)
2967                         pf_send_icmp(m, r->return_icmp >> 8,
2968                             r->return_icmp & 255, af, r);
2969                 else if ((af == AF_INET6) && r->return_icmp6)
2970                         pf_send_icmp(m, r->return_icmp6 >> 8,
2971                             r->return_icmp6 & 255, af, r);
2972         }
2973
2974         if (r->action == PF_DROP)
2975                 return (PF_DROP);
2976
2977         pf_tag_packet(m, tag);
2978
2979         if (r->keep_state || nr != NULL) {
2980                 /* create new state */
2981                 struct pf_state *s = NULL;
2982                 struct pf_src_node *sn = NULL;
2983
2984                 /* check maximums */
2985                 if (r->max_states && (r->states >= r->max_states))
2986                         goto cleanup;
2987                 /* src node for flter rule */
2988                 if ((r->rule_flag & PFRULE_SRCTRACK ||
2989                     r->rpool.opts & PF_POOL_STICKYADDR) &&
2990                     pf_insert_src_node(&sn, r, saddr, af) != 0)
2991                         goto cleanup;
2992                 /* src node for translation rule */
2993                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
2994                     ((direction == PF_OUT &&
2995                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
2996                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
2997                         goto cleanup;
2998                 s = pool_get(&pf_state_pl, PR_NOWAIT);
2999                 if (s == NULL) {
3000 cleanup:
3001                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3002                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3003                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3004                                 pf_status.src_nodes--;
3005                                 pool_put(&pf_src_tree_pl, sn);
3006                         }
3007                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3008                             nsn->expire == 0) {
3009                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3010                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3011                                 pf_status.src_nodes--;
3012                                 pool_put(&pf_src_tree_pl, nsn);
3013                         }
3014                         REASON_SET(&reason, PFRES_MEMORY);
3015                         return (PF_DROP);
3016                 }
3017                 bzero(s, sizeof(*s));
3018                 r->states++;
3019                 if (a != NULL)
3020                         a->states++;
3021                 s->rule.ptr = r;
3022                 s->nat_rule.ptr = nr;
3023                 if (s->nat_rule.ptr != NULL)
3024                         s->nat_rule.ptr->states++;
3025                 s->anchor.ptr = a;
3026                 s->allow_opts = r->allow_opts;
3027                 s->log = r->log & 2;
3028                 s->proto = IPPROTO_UDP;
3029                 s->direction = direction;
3030                 s->af = af;
3031                 if (direction == PF_OUT) {
3032                         PF_ACPY(&s->gwy.addr, saddr, af);
3033                         s->gwy.port = uh->uh_sport;
3034                         PF_ACPY(&s->ext.addr, daddr, af);
3035                         s->ext.port = uh->uh_dport;
3036                         if (nr != NULL) {
3037                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3038                                 s->lan.port = bport;
3039                         } else {
3040                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3041                                 s->lan.port = s->gwy.port;
3042                         }
3043                 } else {
3044                         PF_ACPY(&s->lan.addr, daddr, af);
3045                         s->lan.port = uh->uh_dport;
3046                         PF_ACPY(&s->ext.addr, saddr, af);
3047                         s->ext.port = uh->uh_sport;
3048                         if (nr != NULL) {
3049                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3050                                 s->gwy.port = bport;
3051                         } else {
3052                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3053                                 s->gwy.port = s->lan.port;
3054                         }
3055                 }
3056                 s->src.state = PFUDPS_SINGLE;
3057                 s->dst.state = PFUDPS_NO_TRAFFIC;
3058                 s->creation = time_second;
3059                 s->expire = time_second;
3060                 s->timeout = PFTM_UDP_FIRST_PACKET;
3061                 pf_set_rt_ifp(s, saddr);
3062                 if (sn != NULL) {
3063                         s->src_node = sn;
3064                         s->src_node->states++;
3065                 }
3066                 if (nsn != NULL) {
3067                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3068                         s->nat_src_node = nsn;
3069                         s->nat_src_node->states++;
3070                 }
3071                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3072                         REASON_SET(&reason, PFRES_MEMORY);
3073                         pf_src_tree_remove_state(s);
3074                         pool_put(&pf_state_pl, s);
3075                         return (PF_DROP);
3076                 } else
3077                         *sm = s;
3078         }
3079
3080         /* copy back packet headers if we performed NAT operations */
3081         if (rewrite)
3082                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
3083
3084         return (PF_PASS);
3085 }
3086
3087 int
3088 pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction,
3089     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3090     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
3091 {
3092         struct pf_rule          *nr = NULL;
3093         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3094         struct pf_rule          *r, *a = NULL;
3095         struct pf_ruleset       *ruleset = NULL;
3096         struct pf_src_node      *nsn = NULL;
3097         u_short                  reason;
3098         u_int16_t                icmpid = 0;
3099         sa_family_t              af = pd->af;
3100         u_int8_t                 icmptype = 0, icmpcode = 0;
3101         int                      state_icmp = 0;
3102         int                      tag = -1;
3103 #ifdef INET6
3104         int                      rewrite = 0;
3105 #endif /* INET6 */
3106
3107         switch (pd->proto) {
3108 #ifdef INET
3109         case IPPROTO_ICMP:
3110                 icmptype = pd->hdr.icmp->icmp_type;
3111                 icmpcode = pd->hdr.icmp->icmp_code;
3112                 icmpid = pd->hdr.icmp->icmp_id;
3113
3114                 if (icmptype == ICMP_UNREACH ||
3115                     icmptype == ICMP_SOURCEQUENCH ||
3116                     icmptype == ICMP_REDIRECT ||
3117                     icmptype == ICMP_TIMXCEED ||
3118                     icmptype == ICMP_PARAMPROB)
3119                         state_icmp++;
3120                 break;
3121 #endif /* INET */
3122 #ifdef INET6
3123         case IPPROTO_ICMPV6:
3124                 icmptype = pd->hdr.icmp6->icmp6_type;
3125                 icmpcode = pd->hdr.icmp6->icmp6_code;
3126                 icmpid = pd->hdr.icmp6->icmp6_id;
3127
3128                 if (icmptype == ICMP6_DST_UNREACH ||
3129                     icmptype == ICMP6_PACKET_TOO_BIG ||
3130                     icmptype == ICMP6_TIME_EXCEEDED ||
3131                     icmptype == ICMP6_PARAM_PROB)
3132                         state_icmp++;
3133                 break;
3134 #endif /* INET6 */
3135         }
3136
3137         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3138
3139         if (direction == PF_OUT) {
3140                 /* check outgoing packet for BINAT/NAT */
3141                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3142                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3143                         PF_ACPY(&pd->baddr, saddr, af);
3144                         switch (af) {
3145 #ifdef INET
3146                         case AF_INET:
3147                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3148                                     pd->naddr.v4.s_addr, 0);
3149                                 break;
3150 #endif /* INET */
3151 #ifdef INET6
3152                         case AF_INET6:
3153                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3154                                     &pd->naddr, 0);
3155                                 rewrite++;
3156                                 break;
3157 #endif /* INET6 */
3158                         }
3159                         if (nr->natpass)
3160                                 r = NULL;
3161                         pd->nat_rule = nr;
3162                 }
3163         } else {
3164                 /* check incoming packet for BINAT/RDR */
3165                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3166                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3167                         PF_ACPY(&pd->baddr, daddr, af);
3168                         switch (af) {
3169 #ifdef INET
3170                         case AF_INET:
3171                                 pf_change_a(&daddr->v4.s_addr,
3172                                     pd->ip_sum, pd->naddr.v4.s_addr, 0);
3173                                 break;
3174 #endif /* INET */
3175 #ifdef INET6
3176                         case AF_INET6:
3177                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3178                                     &pd->naddr, 0);
3179                                 rewrite++;
3180                                 break;
3181 #endif /* INET6 */
3182                         }
3183                         if (nr->natpass)
3184                                 r = NULL;
3185                         pd->nat_rule = nr;
3186                 }
3187         }
3188
3189         while (r != NULL) {
3190                 r->evaluations++;
3191                 if (r->kif != NULL &&
3192                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3193                         r = r->skip[PF_SKIP_IFP].ptr;
3194                 else if (r->direction && r->direction != direction)
3195                         r = r->skip[PF_SKIP_DIR].ptr;
3196                 else if (r->af && r->af != af)
3197                         r = r->skip[PF_SKIP_AF].ptr;
3198                 else if (r->proto && r->proto != pd->proto)
3199                         r = r->skip[PF_SKIP_PROTO].ptr;
3200                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
3201                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3202                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
3203                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3204                 else if (r->type && r->type != icmptype + 1)
3205                         r = TAILQ_NEXT(r, entries);
3206                 else if (r->code && r->code != icmpcode + 1)
3207                         r = TAILQ_NEXT(r, entries);
3208                 else if (r->tos && !(r->tos & pd->tos))
3209                         r = TAILQ_NEXT(r, entries);
3210                 else if (r->rule_flag & PFRULE_FRAGMENT)
3211                         r = TAILQ_NEXT(r, entries);
3212                 else if (r->prob && r->prob <= karc4random())
3213                         r = TAILQ_NEXT(r, entries);
3214                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3215                         r = TAILQ_NEXT(r, entries);
3216                 else if (r->anchorname[0] && r->anchor == NULL)
3217                         r = TAILQ_NEXT(r, entries);
3218                 else if (r->os_fingerprint != PF_OSFP_ANY)
3219                         r = TAILQ_NEXT(r, entries);
3220                 else {
3221                         if (r->tag)
3222                                 tag = r->tag;
3223                         if (r->anchor == NULL) {
3224                                 *rm = r;
3225                                 *am = a;
3226                                 *rsm = ruleset;
3227                                 if ((*rm)->quick)
3228                                         break;
3229                                 r = TAILQ_NEXT(r, entries);
3230                         } else
3231                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3232                                     PF_RULESET_FILTER);
3233                 }
3234                 if (r == NULL && a != NULL)
3235                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3236                             PF_RULESET_FILTER);
3237         }
3238         r = *rm;
3239         a = *am;
3240         ruleset = *rsm;
3241
3242         REASON_SET(&reason, PFRES_MATCH);
3243
3244         if (r->log) {
3245 #ifdef INET6
3246                 if (rewrite)
3247                         m_copyback(m, off, sizeof(struct icmp6_hdr),
3248                             (caddr_t)pd->hdr.icmp6);
3249 #endif /* INET6 */
3250                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3251         }
3252
3253         if (r->action != PF_PASS)
3254                 return (PF_DROP);
3255
3256         pf_tag_packet(m, tag);
3257
3258         if (!state_icmp && (r->keep_state || nr != NULL)) {
3259                 /* create new state */
3260                 struct pf_state *s = NULL;
3261                 struct pf_src_node *sn = NULL;
3262
3263                 /* check maximums */
3264                 if (r->max_states && (r->states >= r->max_states))
3265                         goto cleanup;
3266                 /* src node for flter rule */
3267                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3268                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3269                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3270                         goto cleanup;
3271                 /* src node for translation rule */
3272                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3273                     ((direction == PF_OUT &&
3274                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3275                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3276                         goto cleanup;
3277                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3278                 if (s == NULL) {
3279 cleanup:
3280                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3281                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3282                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3283                                 pf_status.src_nodes--;
3284                                 pool_put(&pf_src_tree_pl, sn);
3285                         }
3286                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3287                             nsn->expire == 0) {
3288                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3289                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3290                                 pf_status.src_nodes--;
3291                                 pool_put(&pf_src_tree_pl, nsn);
3292                         }
3293                         REASON_SET(&reason, PFRES_MEMORY);
3294                         return (PF_DROP);
3295                 }
3296                 bzero(s, sizeof(*s));
3297                 r->states++;
3298                 if (a != NULL)
3299                         a->states++;
3300                 s->rule.ptr = r;
3301                 s->nat_rule.ptr = nr;
3302                 if (s->nat_rule.ptr != NULL)
3303                         s->nat_rule.ptr->states++;
3304                 s->anchor.ptr = a;
3305                 s->allow_opts = r->allow_opts;
3306                 s->log = r->log & 2;
3307                 s->proto = pd->proto;
3308                 s->direction = direction;
3309                 s->af = af;
3310                 if (direction == PF_OUT) {
3311                         PF_ACPY(&s->gwy.addr, saddr, af);
3312                         s->gwy.port = icmpid;
3313                         PF_ACPY(&s->ext.addr, daddr, af);
3314                         s->ext.port = icmpid;
3315                         if (nr != NULL)
3316                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3317                         else
3318                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3319                         s->lan.port = icmpid;
3320                 } else {
3321                         PF_ACPY(&s->lan.addr, daddr, af);
3322                         s->lan.port = icmpid;
3323                         PF_ACPY(&s->ext.addr, saddr, af);
3324                         s->ext.port = icmpid;
3325                         if (nr != NULL)
3326                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3327                         else
3328                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3329                         s->gwy.port = icmpid;
3330                 }
3331                 s->creation = time_second;
3332                 s->expire = time_second;
3333                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3334                 pf_set_rt_ifp(s, saddr);
3335                 if (sn != NULL) {
3336                         s->src_node = sn;
3337                         s->src_node->states++;
3338                 }
3339                 if (nsn != NULL) {
3340                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3341                         s->nat_src_node = nsn;
3342                         s->nat_src_node->states++;
3343                 }
3344                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3345                         REASON_SET(&reason, PFRES_MEMORY);
3346                         pf_src_tree_remove_state(s);
3347                         pool_put(&pf_state_pl, s);
3348                         return (PF_DROP);
3349                 } else
3350                         *sm = s;
3351         }
3352
3353 #ifdef INET6
3354         /* copy back packet headers if we performed IPv6 NAT operations */
3355         if (rewrite)
3356                 m_copyback(m, off, sizeof(struct icmp6_hdr),
3357                     (caddr_t)pd->hdr.icmp6);
3358 #endif /* INET6 */
3359
3360         return (PF_PASS);
3361 }
3362
3363 int
3364 pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction,
3365     struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3366     struct pf_rule **am, struct pf_ruleset **rsm)
3367 {
3368         struct pf_rule          *nr = NULL;
3369         struct pf_rule          *r, *a = NULL;
3370         struct pf_ruleset       *ruleset = NULL;
3371         struct pf_src_node      *nsn = NULL;
3372         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3373         sa_family_t              af = pd->af;
3374         u_short                  reason;
3375         int                      tag = -1;
3376
3377         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3378
3379         if (direction == PF_OUT) {
3380                 /* check outgoing packet for BINAT/NAT */
3381                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3382                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3383                         PF_ACPY(&pd->baddr, saddr, af);
3384                         switch (af) {
3385 #ifdef INET
3386                         case AF_INET:
3387                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3388                                     pd->naddr.v4.s_addr, 0);
3389                                 break;
3390 #endif /* INET */
3391 #ifdef INET6
3392                         case AF_INET6:
3393                                 PF_ACPY(saddr, &pd->naddr, af);
3394                                 break;
3395 #endif /* INET6 */
3396                         }
3397                         if (nr->natpass)
3398                                 r = NULL;
3399                         pd->nat_rule = nr;
3400                 }
3401         } else {
3402                 /* check incoming packet for BINAT/RDR */
3403                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3404                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3405                         PF_ACPY(&pd->baddr, daddr, af);
3406                         switch (af) {
3407 #ifdef INET
3408                         case AF_INET:
3409                                 pf_change_a(&daddr->v4.s_addr,
3410                                     pd->ip_sum, pd->naddr.v4.s_addr, 0);
3411                                 break;
3412 #endif /* INET */
3413 #ifdef INET6
3414                         case AF_INET6:
3415                                 PF_ACPY(daddr, &pd->naddr, af);
3416                                 break;
3417 #endif /* INET6 */
3418                         }
3419                         if (nr->natpass)
3420                                 r = NULL;
3421                         pd->nat_rule = nr;
3422                 }
3423         }
3424
3425         while (r != NULL) {
3426                 r->evaluations++;
3427                 if (r->kif != NULL &&
3428                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3429                         r = r->skip[PF_SKIP_IFP].ptr;
3430                 else if (r->direction && r->direction != direction)
3431                         r = r->skip[PF_SKIP_DIR].ptr;
3432                 else if (r->af && r->af != af)
3433                         r = r->skip[PF_SKIP_AF].ptr;
3434                 else if (r->proto && r->proto != pd->proto)
3435                         r = r->skip[PF_SKIP_PROTO].ptr;
3436                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3437                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3438                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3439                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3440                 else if (r->tos && !(r->tos & pd->tos))
3441                         r = TAILQ_NEXT(r, entries);
3442                 else if (r->rule_flag & PFRULE_FRAGMENT)
3443                         r = TAILQ_NEXT(r, entries);
3444                 else if (r->prob && r->prob <= karc4random())
3445                         r = TAILQ_NEXT(r, entries);
3446                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3447                         r = TAILQ_NEXT(r, entries);
3448                 else if (r->anchorname[0] && r->anchor == NULL)
3449                         r = TAILQ_NEXT(r, entries);
3450                 else if (r->os_fingerprint != PF_OSFP_ANY)
3451                         r = TAILQ_NEXT(r, entries);
3452                 else {
3453                         if (r->tag)
3454                                 tag = r->tag;
3455                         if (r->anchor == NULL) {
3456                                 *rm = r;
3457                                 *am = a;
3458                                 *rsm = ruleset;
3459                                 if ((*rm)->quick)
3460                                         break;
3461                                 r = TAILQ_NEXT(r, entries);
3462                         } else
3463                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3464                                     PF_RULESET_FILTER);
3465                 }
3466                 if (r == NULL && a != NULL)
3467                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3468                             PF_RULESET_FILTER);
3469         }
3470         r = *rm;
3471         a = *am;
3472         ruleset = *rsm;
3473
3474         REASON_SET(&reason, PFRES_MATCH);
3475
3476         if (r->log)
3477                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3478
3479         if ((r->action == PF_DROP) &&
3480             ((r->rule_flag & PFRULE_RETURNICMP) ||
3481             (r->rule_flag & PFRULE_RETURN))) {
3482                 struct pf_addr *a = NULL;
3483
3484                 if (nr != NULL) {
3485                         if (direction == PF_OUT)
3486                                 a = saddr;
3487                         else
3488                                 a = daddr;
3489                 }
3490                 if (a != NULL) {
3491                         switch (af) {
3492 #ifdef INET
3493                         case AF_INET:
3494                                 pf_change_a(&a->v4.s_addr, pd->ip_sum,
3495                                     pd->baddr.v4.s_addr, 0);
3496                                 break;
3497 #endif /* INET */
3498 #ifdef INET6
3499                         case AF_INET6:
3500                                 PF_ACPY(a, &pd->baddr, af);
3501                                 break;
3502 #endif /* INET6 */
3503                         }
3504                 }
3505                 if ((af == AF_INET) && r->return_icmp)
3506                         pf_send_icmp(m, r->return_icmp >> 8,
3507                             r->return_icmp & 255, af, r);
3508                 else if ((af == AF_INET6) && r->return_icmp6)
3509                         pf_send_icmp(m, r->return_icmp6 >> 8,
3510                             r->return_icmp6 & 255, af, r);
3511         }
3512
3513         if (r->action != PF_PASS)
3514                 return (PF_DROP);
3515
3516         pf_tag_packet(m, tag);
3517
3518         if (r->keep_state || nr != NULL) {
3519                 /* create new state */
3520                 struct pf_state *s = NULL;
3521                 struct pf_src_node *sn = NULL;
3522
3523                 /* check maximums */
3524                 if (r->max_states && (r->states >= r->max_states))
3525                         goto cleanup;
3526                 /* src node for flter rule */
3527                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3528                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3529                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3530                         goto cleanup;
3531                 /* src node for translation rule */
3532                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3533                     ((direction == PF_OUT &&
3534                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3535                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3536                         goto cleanup;
3537                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3538                 if (s == NULL) {
3539 cleanup:
3540                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3541                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3542                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3543                                 pf_status.src_nodes--;
3544                                 pool_put(&pf_src_tree_pl, sn);
3545                         }
3546                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3547                             nsn->expire == 0) {
3548                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3549                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3550                                 pf_status.src_nodes--;
3551                                 pool_put(&pf_src_tree_pl, nsn);
3552                         }
3553                         REASON_SET(&reason, PFRES_MEMORY);
3554                         return (PF_DROP);
3555                 }
3556                 bzero(s, sizeof(*s));
3557                 r->states++;
3558                 if (a != NULL)
3559                         a->states++;
3560                 s->rule.ptr = r;
3561                 s->nat_rule.ptr = nr;
3562                 if (s->nat_rule.ptr != NULL)
3563                         s->nat_rule.ptr->states++;
3564                 s->anchor.ptr = a;
3565                 s->allow_opts = r->allow_opts;
3566                 s->log = r->log & 2;
3567                 s->proto = pd->proto;
3568                 s->direction = direction;
3569                 s->af = af;
3570                 if (direction == PF_OUT) {
3571                         PF_ACPY(&s->gwy.addr, saddr, af);
3572                         PF_ACPY(&s->ext.addr, daddr, af);
3573                         if (nr != NULL)
3574                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3575                         else
3576                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3577                 } else {
3578                         PF_ACPY(&s->lan.addr, daddr, af);
3579                         PF_ACPY(&s->ext.addr, saddr, af);
3580                         if (nr != NULL)
3581                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3582                         else
3583                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3584                 }
3585                 s->src.state = PFOTHERS_SINGLE;
3586                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3587                 s->creation = time_second;
3588                 s->expire = time_second;
3589                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3590                 pf_set_rt_ifp(s, saddr);
3591                 if (sn != NULL) {
3592                         s->src_node = sn;
3593                         s->src_node->states++;
3594                 }
3595                 if (nsn != NULL) {
3596                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3597                         s->nat_src_node = nsn;
3598                         s->nat_src_node->states++;
3599                 }
3600                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3601                         REASON_SET(&reason, PFRES_MEMORY);
3602                         pf_src_tree_remove_state(s);
3603                         pool_put(&pf_state_pl, s);
3604                         return (PF_DROP);
3605                 } else
3606                         *sm = s;
3607         }
3608
3609         return (PF_PASS);
3610 }
3611
3612 int
3613 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3614     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3615     struct pf_ruleset **rsm)
3616 {
3617         struct pf_rule          *r, *a = NULL;
3618         struct pf_ruleset       *ruleset = NULL;
3619         sa_family_t              af = pd->af;
3620         u_short                  reason;
3621         int                      tag = -1;
3622
3623         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3624         while (r != NULL) {
3625                 r->evaluations++;
3626                 if (r->kif != NULL &&
3627                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3628                         r = r->skip[PF_SKIP_IFP].ptr;
3629                 else if (r->direction && r->direction != direction)
3630                         r = r->skip[PF_SKIP_DIR].ptr;
3631                 else if (r->af && r->af != af)
3632                         r = r->skip[PF_SKIP_AF].ptr;
3633                 else if (r->proto && r->proto != pd->proto)
3634                         r = r->skip[PF_SKIP_PROTO].ptr;
3635                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3636                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3637                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3638                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3639                 else if (r->tos && !(r->tos & pd->tos))
3640                         r = TAILQ_NEXT(r, entries);
3641                 else if (r->src.port_op || r->dst.port_op ||
3642                     r->flagset || r->type || r->code ||
3643                     r->os_fingerprint != PF_OSFP_ANY)
3644                         r = TAILQ_NEXT(r, entries);
3645                 else if (r->prob && r->prob <= karc4random())
3646                         r = TAILQ_NEXT(r, entries);
3647                 else if (r->match_tag && !pf_match_tag(m, r, NULL, &tag))
3648                         r = TAILQ_NEXT(r, entries);
3649                 else if (r->anchorname[0] && r->anchor == NULL)
3650                         r = TAILQ_NEXT(r, entries);
3651                 else {
3652                         if (r->anchor == NULL) {
3653                                 *rm = r;
3654                                 *am = a;
3655                                 *rsm = ruleset;
3656                                 if ((*rm)->quick)
3657                                         break;
3658                                 r = TAILQ_NEXT(r, entries);
3659                         } else
3660                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3661                                     PF_RULESET_FILTER);
3662                 }
3663                 if (r == NULL && a != NULL)
3664                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3665                             PF_RULESET_FILTER);
3666         }
3667         r = *rm;
3668         a = *am;
3669         ruleset = *rsm;
3670
3671         REASON_SET(&reason, PFRES_MATCH);
3672
3673         if (r->log)
3674                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3675
3676         if (r->action != PF_PASS)
3677                 return (PF_DROP);
3678
3679         pf_tag_packet(m, tag);
3680
3681         return (PF_PASS);
3682 }
3683
3684 int
3685 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
3686     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3687     u_short *reason)
3688 {
3689         struct pf_state          key;
3690         struct tcphdr           *th = pd->hdr.tcp;
3691         u_int16_t                win = ntohs(th->th_win);
3692         u_int32_t                ack, end, seq;
3693         u_int8_t                 sws, dws;
3694         int                      ackskew;
3695         int                      copyback = 0;
3696         struct pf_state_peer    *src, *dst;
3697
3698         key.af = pd->af;
3699         key.proto = IPPROTO_TCP;
3700         if (direction == PF_IN) {
3701                 PF_ACPY(&key.ext.addr, pd->src, key.af);
3702                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
3703                 key.ext.port = th->th_sport;
3704                 key.gwy.port = th->th_dport;
3705         } else {
3706                 PF_ACPY(&key.lan.addr, pd->src, key.af);
3707                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
3708                 key.lan.port = th->th_sport;
3709                 key.ext.port = th->th_dport;
3710         }
3711
3712         STATE_LOOKUP();
3713
3714         if (direction == (*state)->direction) {
3715                 src = &(*state)->src;
3716                 dst = &(*state)->dst;
3717         } else {
3718                 src = &(*state)->dst;
3719                 dst = &(*state)->src;
3720         }
3721
3722         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
3723                 if (direction != (*state)->direction)
3724                         return (PF_SYNPROXY_DROP);
3725                 if (th->th_flags & TH_SYN) {
3726                         if (ntohl(th->th_seq) != (*state)->src.seqlo)
3727                                 return (PF_DROP);
3728                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3729                             pd->src, th->th_dport, th->th_sport,
3730                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
3731                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0);
3732                         return (PF_SYNPROXY_DROP);
3733                 } else if (!(th->th_flags & TH_ACK) ||
3734                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3735                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3736                         return (PF_DROP);
3737                 else
3738                         (*state)->src.state = PF_TCPS_PROXY_DST;
3739         }
3740         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
3741                 struct pf_state_host *src, *dst;
3742
3743                 if (direction == PF_OUT) {
3744                         src = &(*state)->gwy;
3745                         dst = &(*state)->ext;
3746                 } else {
3747                         src = &(*state)->ext;
3748                         dst = &(*state)->lan;
3749                 }
3750                 if (direction == (*state)->direction) {
3751                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
3752                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3753                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3754                                 return (PF_DROP);
3755                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
3756                         if ((*state)->dst.seqhi == 1)
3757                                 (*state)->dst.seqhi = karc4random();
3758                         pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3759                             &dst->addr, src->port, dst->port,
3760                             (*state)->dst.seqhi, 0, TH_SYN, 0,
3761                             (*state)->src.mss, 0);
3762                         return (PF_SYNPROXY_DROP);
3763                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
3764                     (TH_SYN|TH_ACK)) ||
3765                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1))
3766                         return (PF_DROP);
3767                 else {
3768                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
3769                         (*state)->dst.seqlo = ntohl(th->th_seq);
3770                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3771                             pd->src, th->th_dport, th->th_sport,
3772                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
3773                             TH_ACK, (*state)->src.max_win, 0, 0);
3774                         pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3775                             &dst->addr, src->port, dst->port,
3776                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
3777                             TH_ACK, (*state)->dst.max_win, 0, 0);
3778                         (*state)->src.seqdiff = (*state)->dst.seqhi -
3779                             (*state)->src.seqlo;
3780                         (*state)->dst.seqdiff = (*state)->src.seqhi -
3781                             (*state)->dst.seqlo;
3782                         (*state)->src.seqhi = (*state)->src.seqlo +
3783                             (*state)->dst.max_win;
3784                         (*state)->dst.seqhi = (*state)->dst.seqlo +
3785                             (*state)->src.max_win;
3786                         (*state)->src.wscale = (*state)->dst.wscale = 0;
3787                         (*state)->src.state = (*state)->dst.state =
3788                             TCPS_ESTABLISHED;
3789                         return (PF_SYNPROXY_DROP);
3790                 }
3791         }
3792
3793         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3794                 sws = src->wscale & PF_WSCALE_MASK;
3795                 dws = dst->wscale & PF_WSCALE_MASK;
3796         } else
3797                 sws = dws = 0;
3798
3799         /*
3800          * Sequence tracking algorithm from Guido van Rooij's paper:
3801          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3802          *      tcp_filtering.ps
3803          */
3804
3805         seq = ntohl(th->th_seq);
3806         if (src->seqlo == 0) {
3807                 /* First packet from this end. Set its state */
3808
3809                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3810                     src->scrub == NULL) {
3811                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3812                                 REASON_SET(reason, PFRES_MEMORY);
3813                                 return (PF_DROP);
3814                         }
3815                 }
3816
3817                 /* Deferred generation of sequence number modulator */
3818                 if (dst->seqdiff && !src->seqdiff) {
3819                         while ((src->seqdiff = karc4random()) == 0)
3820                                 ;
3821                         ack = ntohl(th->th_ack) - dst->seqdiff;
3822                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3823                             src->seqdiff), 0);
3824                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3825                         copyback = 1;
3826                 } else {
3827                         ack = ntohl(th->th_ack);
3828                 }
3829
3830                 end = seq + pd->p_len;
3831                 if (th->th_flags & TH_SYN) {
3832                         end++;
3833                         if (dst->wscale & PF_WSCALE_FLAG) {
3834                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3835                                     pd->af);
3836                                 if (src->wscale & PF_WSCALE_FLAG) {
3837                                         /* Remove scale factor from initial
3838                                          * window */
3839                                         sws = src->wscale & PF_WSCALE_MASK;
3840                                         win = ((u_int32_t)win + (1 << sws) - 1)
3841                                             >> sws;
3842                                         dws = dst->wscale & PF_WSCALE_MASK;
3843                                 } else {
3844                                         /* fixup other window */
3845                                         dst->max_win <<= dst->wscale &
3846                                             PF_WSCALE_MASK;
3847                                         /* in case of a retrans SYN|ACK */
3848                                         dst->wscale = 0;
3849                                 }
3850                         }
3851                 }
3852                 if (th->th_flags & TH_FIN)
3853                         end++;
3854
3855                 src->seqlo = seq;
3856                 if (src->state < TCPS_SYN_SENT)
3857                         src->state = TCPS_SYN_SENT;
3858
3859                 /*
3860                  * May need to slide the window (seqhi may have been set by
3861                  * the crappy stack check or if we picked up the connection
3862                  * after establishment)
3863                  */
3864                 if (src->seqhi == 1 ||
3865                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3866                         src->seqhi = end + MAX(1, dst->max_win << dws);
3867                 if (win > src->max_win)
3868                         src->max_win = win;
3869
3870         } else {
3871                 ack = ntohl(th->th_ack) - dst->seqdiff;
3872                 if (src->seqdiff) {
3873                         /* Modulate sequence numbers */
3874                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3875                             src->seqdiff), 0);
3876                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3877                         copyback = 1;
3878                 }
3879                 end = seq + pd->p_len;
3880                 if (th->th_flags & TH_SYN)
3881                         end++;
3882                 if (th->th_flags & TH_FIN)
3883                         end++;
3884         }
3885
3886         if ((th->th_flags & TH_ACK) == 0) {
3887                 /* Let it pass through the ack skew check */
3888                 ack = dst->seqlo;
3889         } else if ((ack == 0 &&
3890             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3891             /* broken tcp stacks do not set ack */
3892             (dst->state < TCPS_SYN_SENT)) {
3893                 /*
3894                  * Many stacks (ours included) will set the ACK number in an
3895                  * FIN|ACK if the SYN times out -- no sequence to ACK.
3896                  */
3897                 ack = dst->seqlo;
3898         }
3899
3900         if (seq == end) {
3901                 /* Ease sequencing restrictions on no data packets */
3902                 seq = src->seqlo;
3903                 end = seq;
3904         }
3905
3906         ackskew = dst->seqlo - ack;
3907
3908 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
3909         if (SEQ_GEQ(src->seqhi, end) &&
3910             /* Last octet inside other's window space */
3911             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
3912             /* Retrans: not more than one window back */
3913             (ackskew >= -MAXACKWINDOW) &&
3914             /* Acking not more than one reassembled fragment backwards */
3915             (ackskew <= (MAXACKWINDOW << sws))) {
3916             /* Acking not more than one window forward */
3917
3918                 /* update max window */
3919                 if (src->max_win < win)
3920                         src->max_win = win;
3921                 /* synchronize sequencing */
3922                 if (SEQ_GT(end, src->seqlo))
3923                         src->seqlo = end;
3924                 /* slide the window of what the other end can send */
3925                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
3926                         dst->seqhi = ack + MAX((win << sws), 1);
3927
3928
3929                 /* update states */
3930                 if (th->th_flags & TH_SYN)
3931                         if (src->state < TCPS_SYN_SENT)
3932                                 src->state = TCPS_SYN_SENT;
3933                 if (th->th_flags & TH_FIN)
3934                         if (src->state < TCPS_CLOSING)
3935                                 src->state = TCPS_CLOSING;
3936                 if (th->th_flags & TH_ACK) {
3937                         if (dst->state == TCPS_SYN_SENT)
3938                                 dst->state = TCPS_ESTABLISHED;
3939                         else if (dst->state == TCPS_CLOSING)
3940                                 dst->state = TCPS_FIN_WAIT_2;
3941                 }
3942                 if (th->th_flags & TH_RST)
3943                         src->state = dst->state = TCPS_TIME_WAIT;
3944
3945                 /* update expire time */
3946                 (*state)->expire = time_second;
3947                 if (src->state >= TCPS_FIN_WAIT_2 &&
3948                     dst->state >= TCPS_FIN_WAIT_2)
3949                         (*state)->timeout = PFTM_TCP_CLOSED;
3950                 else if (src->state >= TCPS_FIN_WAIT_2 ||
3951                     dst->state >= TCPS_FIN_WAIT_2)
3952                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
3953                 else if (src->state < TCPS_ESTABLISHED ||
3954                     dst->state < TCPS_ESTABLISHED)
3955                         (*state)->timeout = PFTM_TCP_OPENING;
3956                 else if (src->state >= TCPS_CLOSING ||
3957                     dst->state >= TCPS_CLOSING)
3958                         (*state)->timeout = PFTM_TCP_CLOSING;
3959                 else
3960                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
3961
3962                 /* Fall through to PASS packet */
3963
3964         } else if ((dst->state < TCPS_SYN_SENT ||
3965                 dst->state >= TCPS_FIN_WAIT_2 ||
3966                 src->state >= TCPS_FIN_WAIT_2) &&
3967             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
3968             /* Within a window forward of the originating packet */
3969             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
3970             /* Within a window backward of the originating packet */
3971
3972                 /*
3973                  * This currently handles three situations:
3974                  *  1) Stupid stacks will shotgun SYNs before their peer
3975                  *     replies.
3976                  *  2) When PF catches an already established stream (the
3977                  *     firewall rebooted, the state table was flushed, routes
3978                  *     changed...)
3979                  *  3) Packets get funky immediately after the connection
3980                  *     closes (this should catch Solaris spurious ACK|FINs
3981                  *     that web servers like to spew after a close)
3982                  *
3983                  * This must be a little more careful than the above code
3984                  * since packet floods will also be caught here. We don't
3985                  * update the TTL here to mitigate the damage of a packet
3986                  * flood and so the same code can handle awkward establishment
3987                  * and a loosened connection close.
3988                  * In the establishment case, a correct peer response will
3989                  * validate the connection, go through the normal state code
3990                  * and keep updating the state TTL.
3991                  */
3992
3993                 if (pf_status.debug >= PF_DEBUG_MISC) {
3994                         kprintf("pf: loose state match: ");
3995                         pf_print_state(*state);
3996                         pf_print_flags(th->th_flags);
3997                         kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n",
3998                             seq, ack, pd->p_len, ackskew,
3999                             (*state)->packets[0], (*state)->packets[1]);
4000                 }
4001
4002                 /* update max window */
4003                 if (src->max_win < win)
4004                         src->max_win = win;
4005                 /* synchronize sequencing */
4006                 if (SEQ_GT(end, src->seqlo))
4007                         src->seqlo = end;
4008                 /* slide the window of what the other end can send */
4009                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4010                         dst->seqhi = ack + MAX((win << sws), 1);
4011
4012                 /*
4013                  * Cannot set dst->seqhi here since this could be a shotgunned
4014                  * SYN and not an already established connection.
4015                  */
4016
4017                 if (th->th_flags & TH_FIN)
4018                         if (src->state < TCPS_CLOSING)
4019                                 src->state = TCPS_CLOSING;
4020                 if (th->th_flags & TH_RST)
4021                         src->state = dst->state = TCPS_TIME_WAIT;
4022
4023                 /* Fall through to PASS packet */
4024
4025         } else {
4026                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4027                     (*state)->src.state == TCPS_SYN_SENT) {
4028                         /* Send RST for state mismatches during handshake */
4029                         if (!(th->th_flags & TH_RST)) {
4030                                 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
4031
4032                                 if (th->th_flags & TH_SYN)
4033                                         ack++;
4034                                 if (th->th_flags & TH_FIN)
4035                                         ack++;
4036                                 pf_send_tcp((*state)->rule.ptr, pd->af,
4037                                     pd->dst, pd->src, th->th_dport,
4038                                     th->th_sport, ntohl(th->th_ack), ack,
4039                                     TH_RST|TH_ACK, 0, 0,
4040                                     (*state)->rule.ptr->return_ttl);
4041                         }
4042                         src->seqlo = 0;
4043                         src->seqhi = 1;
4044                         src->max_win = 1;
4045                 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4046                         kprintf("pf: BAD state: ");
4047                         pf_print_state(*state);
4048                         pf_print_flags(th->th_flags);
4049                         kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d "
4050                             "dir=%s,%s\n", seq, ack, pd->p_len, ackskew,
4051                             (*state)->packets[0], (*state)->packets[1],
4052                             direction == PF_IN ? "in" : "out",
4053                             direction == (*state)->direction ? "fwd" : "rev");
4054                         kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4055                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4056                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4057                             ' ': '2',
4058                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4059                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4060                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4061                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4062                 }
4063                 return (PF_DROP);
4064         }
4065
4066         if (dst->scrub || src->scrub) {
4067                 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4068                     src, dst, &copyback))
4069                         return (PF_DROP);
4070         }
4071
4072         /* Any packets which have gotten here are to be passed */
4073
4074         /* translate source/destination address, if necessary */
4075         if (STATE_TRANSLATE(*state)) {
4076                 if (direction == PF_OUT)
4077                         pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4078                             &th->th_sum, &(*state)->gwy.addr,
4079                             (*state)->gwy.port, 0, pd->af);
4080                 else
4081                         pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4082                             &th->th_sum, &(*state)->lan.addr,
4083                             (*state)->lan.port, 0, pd->af);
4084                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4085         } else if (copyback) {
4086                 /* Copyback sequence modulation or stateful scrub changes */
4087                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4088         }
4089
4090         return (PF_PASS);
4091 }
4092
4093 int
4094 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4095     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4096 {
4097         struct pf_state_peer    *src, *dst;
4098         struct pf_state          key;
4099         struct udphdr           *uh = pd->hdr.udp;
4100
4101         key.af = pd->af;
4102         key.proto = IPPROTO_UDP;
4103         if (direction == PF_IN) {
4104                 PF_ACPY(&key.ext.addr, pd->src, key.af);
4105                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4106                 key.ext.port = uh->uh_sport;
4107                 key.gwy.port = uh->uh_dport;
4108         } else {
4109                 PF_ACPY(&key.lan.addr, pd->src, key.af);
4110                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4111                 key.lan.port = uh->uh_sport;
4112                 key.ext.port = uh->uh_dport;
4113         }
4114
4115         STATE_LOOKUP();
4116
4117         if (direction == (*state)->direction) {
4118                 src = &(*state)->src;
4119                 dst = &(*state)->dst;
4120         } else {
4121                 src = &(*state)->dst;
4122                 dst = &(*state)->src;
4123         }
4124
4125         /* update states */
4126         if (src->state < PFUDPS_SINGLE)
4127                 src->state = PFUDPS_SINGLE;
4128         if (dst->state == PFUDPS_SINGLE)
4129                 dst->state = PFUDPS_MULTIPLE;
4130
4131         /* update expire time */
4132         (*state)->expire = time_second;
4133         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4134                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4135         else
4136                 (*state)->timeout = PFTM_UDP_SINGLE;
4137
4138         /* translate source/destination address, if necessary */
4139         if (STATE_TRANSLATE(*state)) {
4140                 if (direction == PF_OUT)
4141                         pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4142                             &uh->uh_sum, &(*state)->gwy.addr,
4143                             (*state)->gwy.port, 1, pd->af);
4144                 else
4145                         pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4146                             &uh->uh_sum, &(*state)->lan.addr,
4147                             (*state)->lan.port, 1, pd->af);
4148                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4149         }
4150
4151         return (PF_PASS);
4152 }
4153
4154 int
4155 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4156     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4157 {
4158         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4159         u_int16_t        icmpid = 0;
4160         u_int16_t       *icmpsum = NULL;
4161         u_int8_t         icmptype = 0;
4162         int              state_icmp = 0;
4163
4164         switch (pd->proto) {
4165 #ifdef INET
4166         case IPPROTO_ICMP:
4167                 icmptype = pd->hdr.icmp->icmp_type;
4168                 icmpid = pd->hdr.icmp->icmp_id;
4169                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4170
4171                 if (icmptype == ICMP_UNREACH ||
4172                     icmptype == ICMP_SOURCEQUENCH ||
4173                     icmptype == ICMP_REDIRECT ||
4174                     icmptype == ICMP_TIMXCEED ||
4175                     icmptype == ICMP_PARAMPROB)
4176                         state_icmp++;
4177                 break;
4178 #endif /* INET */
4179 #ifdef INET6
4180         case IPPROTO_ICMPV6:
4181                 icmptype = pd->hdr.icmp6->icmp6_type;
4182                 icmpid = pd->hdr.icmp6->icmp6_id;
4183                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4184
4185                 if (icmptype == ICMP6_DST_UNREACH ||
4186                     icmptype == ICMP6_PACKET_TOO_BIG ||
4187                     icmptype == ICMP6_TIME_EXCEEDED ||
4188                     icmptype == ICMP6_PARAM_PROB)
4189                         state_icmp++;
4190                 break;
4191 #endif /* INET6 */
4192         }
4193
4194         if (!state_icmp) {
4195
4196                 /*
4197                  * ICMP query/reply message not related to a TCP/UDP packet.
4198                  * Search for an ICMP state.
4199                  */
4200                 struct pf_state         key;
4201
4202                 key.af = pd->af;
4203                 key.proto = pd->proto;
4204                 if (direction == PF_IN) {
4205                         PF_ACPY(&key.ext.addr, pd->src, key.af);
4206                         PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4207                         key.ext.port = icmpid;
4208                         key.gwy.port = icmpid;
4209                 } else {
4210                         PF_ACPY(&key.lan.addr, pd->src, key.af);
4211                         PF_ACPY(&key.ext.addr, pd->dst, key.af);
4212                         key.lan.port = icmpid;
4213                         key.ext.port = icmpid;
4214                 }
4215
4216                 STATE_LOOKUP();
4217
4218                 (*state)->expire = time_second;
4219                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4220
4221                 /* translate source/destination address, if necessary */
4222                 if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) {
4223                         if (direction == PF_OUT) {
4224                                 switch (pd->af) {
4225 #ifdef INET
4226                                 case AF_INET:
4227                                         pf_change_a(&saddr->v4.s_addr,
4228                                             pd->ip_sum,
4229                                             (*state)->gwy.addr.v4.s_addr, 0);
4230                                         break;
4231 #endif /* INET */
4232 #ifdef INET6
4233                                 case AF_INET6:
4234                                         pf_change_a6(saddr,
4235                                             &pd->hdr.icmp6->icmp6_cksum,
4236                                             &(*state)->gwy.addr, 0);
4237                                         m_copyback(m, off,
4238                                             sizeof(struct icmp6_hdr),
4239                                             (caddr_t)pd->hdr.icmp6);
4240                                         break;
4241 #endif /* INET6 */
4242                                 }
4243                         } else {
4244                                 switch (pd->af) {
4245 #ifdef INET
4246                                 case AF_INET:
4247                                         pf_change_a(&daddr->v4.s_addr,
4248                                             pd->ip_sum,
4249                                             (*state)->lan.addr.v4.s_addr, 0);
4250                                         break;
4251 #endif /* INET */
4252 #ifdef INET6
4253                                 case AF_INET6:
4254                                         pf_change_a6(daddr,
4255                                             &pd->hdr.icmp6->icmp6_cksum,
4256                                             &(*state)->lan.addr, 0);
4257                                         m_copyback(m, off,
4258                                             sizeof(struct icmp6_hdr),
4259                                             (caddr_t)pd->hdr.icmp6);
4260                                         break;
4261 #endif /* INET6 */
4262                                 }
4263                         }
4264                 }
4265
4266                 return (PF_PASS);
4267
4268         } else {
4269                 /*
4270                  * ICMP error message in response to a TCP/UDP packet.
4271                  * Extract the inner TCP/UDP header and search for that state.
4272                  */
4273
4274                 struct pf_pdesc pd2;
4275 #ifdef INET
4276                 struct ip       h2;
4277 #endif /* INET */
4278 #ifdef INET6
4279                 struct ip6_hdr  h2_6;
4280                 int             terminal = 0;
4281 #endif /* INET6 */
4282                 int             ipoff2 = 0;
4283                 int             off2 = 0;
4284
4285                 pd2.af = pd->af;
4286                 switch (pd->af) {
4287 #ifdef INET
4288                 case AF_INET:
4289                         /* offset of h2 in mbuf chain */
4290                         ipoff2 = off + ICMP_MINLEN;
4291
4292                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4293                             NULL, NULL, pd2.af)) {
4294                                 DPFPRINTF(PF_DEBUG_MISC,
4295                                     ("pf: ICMP error message too short "
4296                                     "(ip)\n"));
4297                                 return (PF_DROP);
4298                         }
4299                         /*
4300                          * ICMP error messages don't refer to non-first
4301                          * fragments
4302                          */
4303                         /*
4304                          * Note: We are dealing with an encapsulated
4305                          * header. This means ip_off/ip_len are not
4306                          * in host byte order!
4307                          */
4308                         if (h2.ip_off & htons(IP_OFFMASK))
4309                                 return (PF_DROP);
4310
4311                         /* offset of protocol header that follows h2 */
4312                         off2 = ipoff2 + (h2.ip_hl << 2);
4313
4314                         pd2.proto = h2.ip_p;
4315                         pd2.src = (struct pf_addr *)&h2.ip_src;
4316                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4317                         pd2.ip_sum = &h2.ip_sum;
4318                         break;
4319 #endif /* INET */
4320 #ifdef INET6
4321                 case AF_INET6:
4322                         ipoff2 = off + sizeof(struct icmp6_hdr);
4323
4324                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4325                             NULL, NULL, pd2.af)) {
4326                                 DPFPRINTF(PF_DEBUG_MISC,
4327                                     ("pf: ICMP error message too short "
4328                                     "(ip6)\n"));
4329                                 return (PF_DROP);
4330                         }
4331                         pd2.proto = h2_6.ip6_nxt;
4332                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4333                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4334                         pd2.ip_sum = NULL;
4335                         off2 = ipoff2 + sizeof(h2_6);
4336                         do {
4337                                 switch (pd2.proto) {
4338                                 case IPPROTO_FRAGMENT:
4339                                         /*
4340                                          * ICMPv6 error messages for
4341                                          * non-first fragments
4342                                          */
4343                                         return (PF_DROP);
4344                                 case IPPROTO_AH:
4345                                 case IPPROTO_HOPOPTS:
4346                                 case IPPROTO_ROUTING:
4347                                 case IPPROTO_DSTOPTS: {
4348                                         /* get next header and header length */
4349                                         struct ip6_ext opt6;
4350
4351                                         if (!pf_pull_hdr(m, off2, &opt6,
4352                                             sizeof(opt6), NULL, NULL, pd2.af)) {
4353                                                 DPFPRINTF(PF_DEBUG_MISC,
4354                                                     ("pf: ICMPv6 short opt\n"));
4355                                                 return (PF_DROP);
4356                                         }
4357                                         if (pd2.proto == IPPROTO_AH)
4358                                                 off2 += (opt6.ip6e_len + 2) * 4;
4359                                         else
4360                                                 off2 += (opt6.ip6e_len + 1) * 8;
4361                                         pd2.proto = opt6.ip6e_nxt;
4362                                         /* goto the next header */
4363                                         break;
4364                                 }
4365                                 default:
4366                                         terminal++;
4367                                         break;
4368                                 }
4369                         } while (!terminal);
4370                         break;
4371 #endif /* INET6 */
4372                 }
4373
4374                 switch (pd2.proto) {
4375                 case IPPROTO_TCP: {
4376                         struct tcphdr            th;
4377                         u_int32_t                seq;
4378                         struct pf_state          key;
4379                         struct pf_state_peer    *src, *dst;
4380                         u_int8_t                 dws;
4381                         int                      copyback = 0;
4382
4383                         /*
4384                          * Only the first 8 bytes of the TCP header can be
4385                          * expected. Don't access any TCP header fields after
4386                          * th_seq, an ackskew test is not possible.
4387                          */
4388                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, NULL, pd2.af)) {
4389                                 DPFPRINTF(PF_DEBUG_MISC,
4390                                     ("pf: ICMP error message too short "
4391                                     "(tcp)\n"));
4392                                 return (PF_DROP);
4393                         }
4394
4395                         key.af = pd2.af;
4396                         key.proto = IPPROTO_TCP;
4397                         if (direction == PF_IN) {
4398                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4399                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4400                                 key.ext.port = th.th_dport;
4401                                 key.gwy.port = th.th_sport;
4402                         } else {
4403                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4404                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4405                                 key.lan.port = th.th_dport;
4406                                 key.ext.port = th.th_sport;
4407                         }
4408
4409                         STATE_LOOKUP();
4410
4411                         if (direction == (*state)->direction) {
4412                                 src = &(*state)->dst;
4413                                 dst = &(*state)->src;
4414                         } else {
4415                                 src = &(*state)->src;
4416                                 dst = &(*state)->dst;
4417                         }
4418
4419                         if (src->wscale && dst->wscale &&
4420                             !(th.th_flags & TH_SYN))
4421                                 dws = dst->wscale & PF_WSCALE_MASK;
4422                         else
4423                                 dws = 0;
4424
4425                         /* Demodulate sequence number */
4426                         seq = ntohl(th.th_seq) - src->seqdiff;
4427                         if (src->seqdiff) {
4428                                 pf_change_a(&th.th_seq, icmpsum,
4429                                     htonl(seq), 0);
4430                                 copyback = 1;
4431                         }
4432
4433                         if (!SEQ_GEQ(src->seqhi, seq) ||
4434                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
4435                                 if (pf_status.debug >= PF_DEBUG_MISC) {
4436                                         kprintf("pf: BAD ICMP %d:%d ",
4437                                             icmptype, pd->hdr.icmp->icmp_code);
4438                                         pf_print_host(pd->src, 0, pd->af);
4439                                         kprintf(" -> ");
4440                                         pf_print_host(pd->dst, 0, pd->af);
4441                                         kprintf(" state: ");
4442                                         pf_print_state(*state);
4443                                         kprintf(" seq=%u\n", seq);
4444                                 }
4445                                 return (PF_DROP);
4446                         }
4447
4448                         if (STATE_TRANSLATE(*state)) {
4449                                 if (direction == PF_IN) {
4450                                         pf_change_icmp(pd2.src, &th.th_sport,
4451                                             daddr, &(*state)->lan.addr,
4452                                             (*state)->lan.port, NULL,
4453                                             pd2.ip_sum, icmpsum,
4454                                             pd->ip_sum, 0, pd2.af);
4455                                 } else {
4456                                         pf_change_icmp(pd2.dst, &th.th_dport,
4457                                             saddr, &(*state)->gwy.addr,
4458                                             (*state)->gwy.port, NULL,
4459                                             pd2.ip_sum, icmpsum,
4460                                             pd->ip_sum, 0, pd2.af);
4461                                 }
4462                                 copyback = 1;
4463                         }
4464
4465                         if (copyback) {
4466                                 switch (pd2.af) {
4467 #ifdef INET
4468                                 case AF_INET:
4469                                         m_copyback(m, off, ICMP_MINLEN,
4470                                             (caddr_t)pd->hdr.icmp);
4471                                         m_copyback(m, ipoff2, sizeof(h2),
4472                                             (caddr_t)&h2);
4473                                         break;
4474 #endif /* INET */
4475 #ifdef INET6
4476                                 case AF_INET6:
4477                                         m_copyback(m, off,
4478                                             sizeof(struct icmp6_hdr),
4479                                             (caddr_t)pd->hdr.icmp6);
4480                                         m_copyback(m, ipoff2, sizeof(h2_6),
4481                                             (caddr_t)&h2_6);
4482                                         break;
4483 #endif /* INET6 */
4484                                 }
4485                                 m_copyback(m, off2, 8, (caddr_t)&th);
4486                         }
4487
4488                         return (PF_PASS);
4489                         break;
4490                 }
4491                 case IPPROTO_UDP: {
4492                         struct udphdr           uh;
4493                         struct pf_state         key;
4494
4495                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4496                             NULL, NULL, pd2.af)) {
4497                                 DPFPRINTF(PF_DEBUG_MISC,
4498                                     ("pf: ICMP error message too short "
4499                                     "(udp)\n"));
4500                                 return (PF_DROP);
4501                         }
4502
4503                         key.af = pd2.af;
4504                         key.proto = IPPROTO_UDP;
4505                         if (direction == PF_IN) {
4506                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4507                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4508                                 key.ext.port = uh.uh_dport;
4509                                 key.gwy.port = uh.uh_sport;
4510                         } else {
4511                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4512                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4513                                 key.lan.port = uh.uh_dport;
4514                                 key.ext.port = uh.uh_sport;
4515                         }
4516
4517                         STATE_LOOKUP();
4518
4519                         if (STATE_TRANSLATE(*state)) {
4520                                 if (direction == PF_IN) {
4521                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4522                                             daddr, &(*state)->lan.addr,
4523                                             (*state)->lan.port, &uh.uh_sum,
4524                                             pd2.ip_sum, icmpsum,
4525                                             pd->ip_sum, 1, pd2.af);
4526                                 } else {
4527                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4528                                             saddr, &(*state)->gwy.addr,
4529                                             (*state)->gwy.port, &uh.uh_sum,
4530                                             pd2.ip_sum, icmpsum,
4531                                             pd->ip_sum, 1, pd2.af);
4532                                 }
4533                                 switch (pd2.af) {
4534 #ifdef INET
4535                                 case AF_INET:
4536                                         m_copyback(m, off, ICMP_MINLEN,
4537                                             (caddr_t)pd->hdr.icmp);
4538                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4539                                         break;
4540 #endif /* INET */
4541 #ifdef INET6
4542                                 case AF_INET6:
4543                                         m_copyback(m, off,
4544                                             sizeof(struct icmp6_hdr),
4545                                             (caddr_t)pd->hdr.icmp6);
4546                                         m_copyback(m, ipoff2, sizeof(h2_6),
4547                                             (caddr_t)&h2_6);
4548                                         break;
4549 #endif /* INET6 */
4550                                 }
4551                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4552                         }
4553
4554                         return (PF_PASS);
4555                         break;
4556                 }
4557 #ifdef INET
4558                 case IPPROTO_ICMP: {
4559                         struct icmp             iih;
4560                         struct pf_state         key;
4561
4562                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4563                             NULL, NULL, pd2.af)) {
4564                                 DPFPRINTF(PF_DEBUG_MISC,
4565                                     ("pf: ICMP error message too short i"
4566                                     "(icmp)\n"));
4567                                 return (PF_DROP);
4568                         }
4569
4570                         key.af = pd2.af;
4571                         key.proto = IPPROTO_ICMP;
4572                         if (direction == PF_IN) {
4573                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4574                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4575                                 key.ext.port = iih.icmp_id;
4576                                 key.gwy.port = iih.icmp_id;
4577                         } else {
4578                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4579                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4580                                 key.lan.port = iih.icmp_id;
4581                                 key.ext.port = iih.icmp_id;
4582                         }
4583
4584                         STATE_LOOKUP();
4585
4586                         if (STATE_TRANSLATE(*state)) {
4587                                 if (direction == PF_IN) {
4588                                         pf_change_icmp(pd2.src, &iih.icmp_id,
4589                                             daddr, &(*state)->lan.addr,
4590                                             (*state)->lan.port, NULL,
4591                                             pd2.ip_sum, icmpsum,
4592                                             pd->ip_sum, 0, AF_INET);
4593                                 } else {
4594                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
4595                                             saddr, &(*state)->gwy.addr,
4596                                             (*state)->gwy.port, NULL,
4597                                             pd2.ip_sum, icmpsum,
4598                                             pd->ip_sum, 0, AF_INET);
4599                                 }
4600                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
4601                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4602                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
4603                         }
4604
4605                         return (PF_PASS);
4606                         break;
4607                 }
4608 #endif /* INET */
4609 #ifdef INET6
4610                 case IPPROTO_ICMPV6: {
4611                         struct icmp6_hdr        iih;
4612                         struct pf_state         key;
4613
4614                         if (!pf_pull_hdr(m, off2, &iih,
4615                             sizeof(struct icmp6_hdr), NULL, NULL, pd2.af)) {
4616                                 DPFPRINTF(PF_DEBUG_MISC,
4617                                     ("pf: ICMP error message too short "
4618                                     "(icmp6)\n"));
4619                                 return (PF_DROP);
4620                         }
4621
4622                         key.af = pd2.af;
4623                         key.proto = IPPROTO_ICMPV6;
4624                         if (direction == PF_IN) {
4625                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4626                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4627                                 key.ext.port = iih.icmp6_id;
4628                                 key.gwy.port = iih.icmp6_id;
4629                         } else {
4630                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4631                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4632                                 key.lan.port = iih.icmp6_id;
4633                                 key.ext.port = iih.icmp6_id;
4634                         }
4635
4636                         STATE_LOOKUP();
4637
4638                         if (STATE_TRANSLATE(*state)) {
4639                                 if (direction == PF_IN) {
4640                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
4641                                             daddr, &(*state)->lan.addr,
4642                                             (*state)->lan.port, NULL,
4643                                             pd2.ip_sum, icmpsum,
4644                                             pd->ip_sum, 0, AF_INET6);
4645                                 } else {
4646                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
4647                                             saddr, &(*state)->gwy.addr,
4648                                             (*state)->gwy.port, NULL,
4649                                             pd2.ip_sum, icmpsum,
4650                                             pd->ip_sum, 0, AF_INET6);
4651                                 }
4652                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4653                                     (caddr_t)pd->hdr.icmp6);
4654                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
4655                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
4656                                     (caddr_t)&iih);
4657                         }
4658
4659                         return (PF_PASS);
4660                         break;
4661                 }
4662 #endif /* INET6 */
4663                 default: {
4664                         struct pf_state         key;
4665
4666                         key.af = pd2.af;
4667                         key.proto = pd2.proto;
4668                         if (direction == PF_IN) {
4669                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4670                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4671                                 key.ext.port = 0;
4672                                 key.gwy.port = 0;
4673                         } else {
4674                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4675                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4676                                 key.lan.port = 0;
4677                                 key.ext.port = 0;
4678                         }
4679
4680                         STATE_LOOKUP();
4681
4682                         if (STATE_TRANSLATE(*state)) {
4683                                 if (direction == PF_IN) {
4684                                         pf_change_icmp(pd2.src, NULL,
4685                                             daddr, &(*state)->lan.addr,
4686                                             0, NULL,
4687                                             pd2.ip_sum, icmpsum,
4688                                             pd->ip_sum, 0, pd2.af);
4689                                 } else {
4690                                         pf_change_icmp(pd2.dst, NULL,
4691                                             saddr, &(*state)->gwy.addr,
4692                                             0, NULL,
4693                                             pd2.ip_sum, icmpsum,
4694                                             pd->ip_sum, 0, pd2.af);
4695                                 }
4696                                 switch (pd2.af) {
4697 #ifdef INET
4698                                 case AF_INET:
4699                                         m_copyback(m, off, ICMP_MINLEN,
4700                                             (caddr_t)pd->hdr.icmp);
4701                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4702                                         break;
4703 #endif /* INET */
4704 #ifdef INET6
4705                                 case AF_INET6:
4706                                         m_copyback(m, off,
4707                                             sizeof(struct icmp6_hdr),
4708                                             (caddr_t)pd->hdr.icmp6);
4709                                         m_copyback(m, ipoff2, sizeof(h2_6),
4710                                             (caddr_t)&h2_6);
4711                                         break;
4712 #endif /* INET6 */
4713                                 }
4714                         }
4715
4716                         return (PF_PASS);
4717                         break;
4718                 }
4719                 }
4720         }
4721 }
4722
4723 int
4724 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
4725     struct pf_pdesc *pd)
4726 {
4727         struct pf_state_peer    *src, *dst;
4728         struct pf_state          key;
4729
4730         key.af = pd->af;
4731         key.proto = pd->proto;
4732         if (direction == PF_IN) {
4733                 PF_ACPY(&key.ext.addr, pd->src, key.af);
4734                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4735                 key.ext.port = 0;
4736                 key.gwy.port = 0;
4737         } else {
4738                 PF_ACPY(&key.lan.addr, pd->src, key.af);
4739                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4740                 key.lan.port = 0;
4741                 key.ext.port = 0;
4742         }
4743
4744         STATE_LOOKUP();
4745
4746         if (direction == (*state)->direction) {
4747                 src = &(*state)->src;
4748                 dst = &(*state)->dst;
4749         } else {
4750                 src = &(*state)->dst;
4751                 dst = &(*state)->src;
4752         }
4753
4754         /* update states */
4755         if (src->state < PFOTHERS_SINGLE)
4756                 src->state = PFOTHERS_SINGLE;
4757         if (dst->state == PFOTHERS_SINGLE)
4758                 dst->state = PFOTHERS_MULTIPLE;
4759
4760         /* update expire time */
4761         (*state)->expire = time_second;
4762         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
4763                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
4764         else
4765                 (*state)->timeout = PFTM_OTHER_SINGLE;
4766
4767         /* translate source/destination address, if necessary */
4768         if (STATE_TRANSLATE(*state)) {
4769                 if (direction == PF_OUT)
4770                         switch (pd->af) {
4771 #ifdef INET
4772                         case AF_INET:
4773                                 pf_change_a(&pd->src->v4.s_addr,
4774                                     pd->ip_sum, (*state)->gwy.addr.v4.s_addr,
4775                                     0);
4776                                 break;
4777 #endif /* INET */
4778 #ifdef INET6
4779                         case AF_INET6:
4780                                 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af);
4781                                 break;
4782 #endif /* INET6 */
4783                         }
4784                 else
4785                         switch (pd->af) {
4786 #ifdef INET
4787                         case AF_INET:
4788                                 pf_change_a(&pd->dst->v4.s_addr,
4789                                     pd->ip_sum, (*state)->lan.addr.v4.s_addr,
4790                                     0);
4791                                 break;
4792 #endif /* INET */
4793 #ifdef INET6
4794                         case AF_INET6:
4795                                 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af);
4796                                 break;
4797 #endif /* INET6 */
4798                         }
4799         }
4800
4801         return (PF_PASS);
4802 }
4803
4804 /*
4805  * ipoff and off are measured from the start of the mbuf chain.
4806  * h must be at "ipoff" on the mbuf chain.
4807  */
4808 void *
4809 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
4810     u_short *actionp, u_short *reasonp, sa_family_t af)
4811 {
4812         switch (af) {
4813 #ifdef INET
4814         case AF_INET: {
4815                 struct ip       *h = mtod(m, struct ip *);
4816                 u_int16_t        fragoff = (h->ip_off & IP_OFFMASK) << 3;
4817
4818                 if (fragoff) {
4819                         if (fragoff >= len)
4820                                 ACTION_SET(actionp, PF_PASS);
4821                         else {
4822                                 ACTION_SET(actionp, PF_DROP);
4823                                 REASON_SET(reasonp, PFRES_FRAG);
4824                         }
4825                         return (NULL);
4826                 }
4827                 if (m->m_pkthdr.len < off + len ||
4828                     h->ip_len < off + len) {
4829                         ACTION_SET(actionp, PF_DROP);
4830                         REASON_SET(reasonp, PFRES_SHORT);
4831                         return (NULL);
4832                 }
4833                 break;
4834         }
4835 #endif /* INET */
4836 #ifdef INET6
4837         case AF_INET6: {
4838                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
4839
4840                 if (m->m_pkthdr.len < off + len ||
4841                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
4842                     (unsigned)(off + len)) {
4843                         ACTION_SET(actionp, PF_DROP);
4844                         REASON_SET(reasonp, PFRES_SHORT);
4845                         return (NULL);
4846                 }
4847                 break;
4848         }
4849 #endif /* INET6 */
4850         }
4851         m_copydata(m, off, len, p);
4852         return (p);
4853 }
4854
4855 int
4856 pf_routable(struct pf_addr *addr, sa_family_t af)
4857 {
4858         struct sockaddr_in      *dst;
4859         struct route             ro;
4860         int                      ret = 0;
4861
4862         bzero(&ro, sizeof(ro));
4863         dst = satosin(&ro.ro_dst);
4864         dst->sin_family = af;
4865         dst->sin_len = sizeof(*dst);
4866         dst->sin_addr = addr->v4;
4867         rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
4868
4869         if (ro.ro_rt != NULL) {
4870                 ret = 1;
4871                 RTFREE(ro.ro_rt);
4872         }
4873
4874         return (ret);
4875 }
4876
4877 #ifdef INET
4878 void
4879 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
4880     struct pf_state *s)
4881 {
4882         struct mbuf             *m0, *m1;
4883         struct route             iproute;
4884         struct route            *ro = NULL;
4885         struct sockaddr_in      *dst;
4886         struct ip               *ip;
4887         struct ifnet            *ifp = NULL;
4888         struct pf_addr           naddr;
4889         struct pf_src_node      *sn = NULL;
4890         int                      error = 0;
4891         int sw_csum;
4892
4893         if (m == NULL || *m == NULL || r == NULL ||
4894             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
4895                 panic("pf_route: invalid parameters");
4896
4897         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
4898                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
4899                 (*m)->m_pkthdr.pf_routed = 1;
4900         } else {
4901                 if ((*m)->m_pkthdr.pf_routed > 3) {
4902                         m0 = *m;
4903                         *m = NULL;
4904                         goto bad;
4905                 }
4906                 (*m)->m_pkthdr.pf_routed++;
4907         }
4908
4909         if (r->rt == PF_DUPTO) {
4910                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
4911                         return;
4912         } else {
4913                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
4914                         return;
4915                 m0 = *m;
4916         }
4917
4918         if (m0->m_len < sizeof(struct ip))
4919                 panic("pf_route: m0->m_len < sizeof(struct ip)");
4920         ip = mtod(m0, struct ip *);
4921
4922         ro = &iproute;
4923         bzero((caddr_t)ro, sizeof(*ro));
4924         dst = satosin(&ro->ro_dst);
4925         dst->sin_family = AF_INET;
4926         dst->sin_len = sizeof(*dst);
4927         dst->sin_addr = ip->ip_dst;
4928
4929         if (r->rt == PF_FASTROUTE) {
4930                 rtalloc(ro);
4931                 if (ro->ro_rt == 0) {
4932                         ipstat.ips_noroute++;
4933                         goto bad;
4934                 }
4935
4936                 ifp = ro->ro_rt->rt_ifp;
4937                 ro->ro_rt->rt_use++;
4938
4939                 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
4940                         dst = satosin(ro->ro_rt->rt_gateway);
4941         } else {
4942                 if (TAILQ_EMPTY(&r->rpool.list))
4943                         panic("pf_route: TAILQ_EMPTY(&r->rpool.list)");
4944                 if (s == NULL) {
4945                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
4946                             &naddr, NULL, &sn);
4947                         if (!PF_AZERO(&naddr, AF_INET))
4948                                 dst->sin_addr.s_addr = naddr.v4.s_addr;
4949                         ifp = r->rpool.cur->kif ?
4950                             r->rpool.cur->kif->pfik_ifp : NULL;
4951                 } else {
4952                         if (!PF_AZERO(&s->rt_addr, AF_INET))
4953                                 dst->sin_addr.s_addr =
4954                                     s->rt_addr.v4.s_addr;
4955                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
4956                 }
4957         }
4958         if (ifp == NULL)
4959                 goto bad;
4960
4961         if (oifp != ifp) {
4962                 if (pf_test(PF_OUT, ifp, &m0) != PF_PASS)
4963                         goto bad;
4964                 else if (m0 == NULL)
4965                         goto done;
4966                 if (m0->m_len < sizeof(struct ip))
4967                         panic("pf_route: m0->m_len < sizeof(struct ip)");
4968                 ip = mtod(m0, struct ip *);
4969         }
4970
4971         /* Copied from ip_output. */
4972         m0->m_pkthdr.csum_flags |= CSUM_IP;
4973         sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
4974         if (sw_csum & CSUM_DELAY_DATA) {
4975                 in_delayed_cksum(m0);
4976                 sw_csum &= ~CSUM_DELAY_DATA;
4977         }
4978         m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
4979
4980         /*
4981          * If small enough for interface, or the interface will take
4982          * care of the fragmentation for us, can just send directly.
4983          */
4984         if (ip->ip_len <= ifp->if_mtu || ((ifp->if_hwassist & CSUM_FRAGMENT) &&
4985                 (ip->ip_off & IP_DF) == 0)) {
4986                 ip->ip_len = htons(ip->ip_len);
4987                 ip->ip_off = htons(ip->ip_off);
4988                 ip->ip_sum = 0;
4989                 if (sw_csum & CSUM_DELAY_IP) {
4990                         /* From KAME */
4991                         if (ip->ip_v == IPVERSION &&
4992                             (ip->ip_hl << 2) == sizeof(*ip)) {
4993                                 ip->ip_sum = in_cksum_hdr(ip);
4994                         } else {
4995                                 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
4996                         }
4997                 }
4998
4999                 lwkt_serialize_enter(ifp->if_serializer);
5000                 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt);
5001                 lwkt_serialize_exit(ifp->if_serializer);
5002                 goto done;
5003         }
5004
5005         /*
5006          * Too large for interface; fragment if possible.
5007          * Must be able to put at least 8 bytes per fragment.
5008          */
5009         if (ip->ip_off & IP_DF) {
5010                 ipstat.ips_cantfrag++;
5011                 if (r->rt != PF_DUPTO) {
5012                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5013                             ifp->if_mtu);
5014                         goto done;
5015                 } else
5016                         goto bad;
5017         }
5018
5019         m1 = m0;
5020         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5021         if (error)
5022                 goto bad;
5023
5024         for (m0 = m1; m0; m0 = m1) {
5025                 m1 = m0->m_nextpkt;
5026                 m0->m_nextpkt = 0;
5027                 if (error == 0) {
5028                         lwkt_serialize_enter(ifp->if_serializer);
5029                         error = (*ifp->if_output)(ifp, m0, sintosa(dst),
5030                                     NULL);
5031                         lwkt_serialize_exit(ifp->if_serializer);
5032                 } else {
5033                         m_freem(m0);
5034                 }
5035         }
5036
5037         if (error == 0)
5038                 ipstat.ips_fragmented++;
5039
5040 done:
5041         if (r->rt != PF_DUPTO)
5042                 *m = NULL;
5043         if (ro == &iproute && ro->ro_rt)
5044                 RTFREE(ro->ro_rt);
5045         return;
5046
5047 bad:
5048         m_freem(m0);
5049         goto done;
5050 }
5051 #endif /* INET */
5052
5053 #ifdef INET6
5054 void
5055 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5056     struct pf_state *s)
5057 {
5058         struct mbuf             *m0;
5059         struct route_in6         ip6route;
5060         struct route_in6        *ro;
5061         struct sockaddr_in6     *dst;
5062         struct ip6_hdr          *ip6;
5063         struct ifnet            *ifp = NULL;
5064         struct pf_addr           naddr;
5065         struct pf_src_node      *sn = NULL;
5066         int                      error = 0;
5067
5068         if (m == NULL || *m == NULL || r == NULL ||
5069             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5070                 panic("pf_route6: invalid parameters");
5071
5072         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5073                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5074                 (*m)->m_pkthdr.pf_routed = 1;
5075         } else {
5076                 if ((*m)->m_pkthdr.pf_routed > 3) {
5077                         m0 = *m;
5078                         *m = NULL;
5079                         goto bad;
5080                 }
5081                 (*m)->m_pkthdr.pf_routed++;
5082         }
5083
5084         if (r->rt == PF_DUPTO) {
5085                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5086                         return;
5087         } else {
5088                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5089                         return;
5090                 m0 = *m;
5091         }
5092
5093         if (m0->m_len < sizeof(struct ip6_hdr))
5094                 panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5095         ip6 = mtod(m0, struct ip6_hdr *);
5096
5097         ro = &ip6route;
5098         bzero((caddr_t)ro, sizeof(*ro));
5099         dst = (struct sockaddr_in6 *)&ro->ro_dst;
5100         dst->sin6_family = AF_INET6;
5101         dst->sin6_len = sizeof(*dst);
5102         dst->sin6_addr = ip6->ip6_dst;
5103
5104         /* Cheat. */
5105         if (r->rt == PF_FASTROUTE) {
5106                 m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED;
5107                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5108                 return;
5109         }
5110
5111         if (TAILQ_EMPTY(&r->rpool.list))
5112                 panic("pf_route6: TAILQ_EMPTY(&r->rpool.list)");
5113         if (s == NULL) {
5114                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5115                     &naddr, NULL, &sn);
5116                 if (!PF_AZERO(&naddr, AF_INET6))
5117                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5118                             &naddr, AF_INET6);
5119                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5120         } else {
5121                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5122                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5123                             &s->rt_addr, AF_INET6);
5124                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5125         }
5126         if (ifp == NULL)
5127                 goto bad;
5128
5129         if (oifp != ifp) {
5130                 if (pf_test6(PF_OUT, ifp, &m0) != PF_PASS)
5131                         goto bad;
5132                 else if (m0 == NULL)
5133                         goto done;
5134                 if (m0->m_len < sizeof(struct ip6_hdr))
5135                         panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5136                 ip6 = mtod(m0, struct ip6_hdr *);
5137         }
5138
5139         /*
5140          * If the packet is too large for the outgoing interface,
5141          * send back an icmp6 error.
5142          */
5143         if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5144                 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5145         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5146                 error = nd6_output(ifp, ifp, m0, dst, NULL);
5147         } else {
5148                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5149                 if (r->rt != PF_DUPTO)
5150                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5151                 else
5152                         goto bad;
5153         }
5154
5155 done:
5156         if (r->rt != PF_DUPTO)
5157                 *m = NULL;
5158         return;
5159
5160 bad:
5161         m_freem(m0);
5162         goto done;
5163 }
5164 #endif /* INET6 */
5165
5166
5167 /*
5168  * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5169  *   off is the offset where the protocol header starts
5170  *   len is the total length of protocol header plus payload
5171  * returns 0 when the checksum is valid, otherwise returns 1.
5172  */
5173 /*
5174  * XXX
5175  * FreeBSD supports cksum offload for the following drivers.
5176  * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5177  * If we can make full use of it we would outperform ipfw/ipfilter in
5178  * very heavy traffic.
5179  * I have not tested 'cause I don't have NICs that supports cksum offload.
5180  * (There might be problems. Typical phenomena would be
5181  *   1. No route message for UDP packet.
5182  *   2. No connection acceptance from external hosts regardless of rule set.)
5183  */
5184 int
5185 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5186     sa_family_t af)
5187 {
5188         u_int16_t sum = 0;
5189         int hw_assist = 0;
5190         struct ip *ip;
5191
5192         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5193                 return (1);
5194         if (m->m_pkthdr.len < off + len)
5195                 return (1);
5196
5197         switch (p) {
5198         case IPPROTO_TCP:
5199         case IPPROTO_UDP:
5200                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5201                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5202                                 sum = m->m_pkthdr.csum_data;
5203                         } else {
5204                                 ip = mtod(m, struct ip *);
5205                                 sum = in_pseudo(ip->ip_src.s_addr,
5206                                         ip->ip_dst.s_addr, htonl((u_short)len +
5207                                         m->m_pkthdr.csum_data + p));
5208                         }
5209                         sum ^= 0xffff;
5210                         ++hw_assist;
5211                 }
5212                 break;
5213         case IPPROTO_ICMP:
5214 #ifdef INET6
5215         case IPPROTO_ICMPV6:
5216 #endif /* INET6 */
5217                 break;
5218         default:
5219                 return (1);
5220         }
5221
5222         if (!hw_assist) {
5223                 switch (af) {
5224                 case AF_INET:
5225                         if (p == IPPROTO_ICMP) {
5226                                 if (m->m_len < off)
5227                                         return (1);
5228                                 m->m_data += off;
5229                                 m->m_len -= off;
5230                                 sum = in_cksum(m, len);
5231                                 m->m_data -= off;
5232                                 m->m_len += off;
5233                         } else {
5234                                 if (m->m_len < sizeof(struct ip))
5235                                         return (1);
5236                                 sum = in_cksum_range(m, p, off, len);
5237                                 if (sum == 0) {
5238                                         m->m_pkthdr.csum_flags |=
5239                                             (CSUM_DATA_VALID |
5240                                              CSUM_PSEUDO_HDR);
5241                                         m->m_pkthdr.csum_data = 0xffff;
5242                                 }
5243                         }
5244                         break;
5245 #ifdef INET6
5246                 case AF_INET6:
5247                         if (m->m_len < sizeof(struct ip6_hdr))
5248                                 return (1);
5249                         sum = in6_cksum(m, p, off, len);
5250                         /*
5251                          * XXX
5252                          * IPv6 H/W cksum off-load not supported yet!
5253                          *
5254                          * if (sum == 0) {
5255                          *      m->m_pkthdr.csum_flags |=
5256                          *          (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5257                          *      m->m_pkthdr.csum_data = 0xffff;
5258                          *}
5259                          */
5260                         break;
5261 #endif /* INET6 */
5262                 default:
5263                         return (1);
5264                 }
5265         }
5266         if (sum) {
5267                 switch (p) {
5268                 case IPPROTO_TCP:
5269                         tcpstat.tcps_rcvbadsum++;
5270                         break;
5271                 case IPPROTO_UDP:
5272                         udpstat.udps_badsum++;
5273                         break;
5274                 case IPPROTO_ICMP:
5275                         icmpstat.icps_checksum++;
5276                         break;
5277 #ifdef INET6
5278                 case IPPROTO_ICMPV6:
5279                         icmp6stat.icp6s_checksum++;
5280                         break;
5281 #endif /* INET6 */
5282                 }
5283                 return (1);
5284         }
5285         return (0);
5286 }
5287
5288 #ifdef INET
5289 int
5290 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0)
5291 {
5292         struct pfi_kif          *kif;
5293         u_short                  action, reason = 0, log = 0;
5294         struct mbuf             *m = *m0;
5295         struct ip               *h = NULL;
5296         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5297         struct pf_state         *s = NULL;
5298         struct pf_ruleset       *ruleset = NULL;
5299         struct pf_pdesc          pd;
5300         int                      off, dirndx, pqid = 0;
5301
5302         if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED))
5303                 return (PF_PASS);
5304
5305         kif = pfi_index2kif[ifp->if_index];
5306         if (kif == NULL)
5307                 return (PF_DROP);
5308
5309 #ifdef DIAGNOSTIC
5310         if ((m->m_flags & M_PKTHDR) == 0)
5311                 panic("non-M_PKTHDR is passed to pf_test");
5312 #endif
5313
5314         memset(&pd, 0, sizeof(pd));
5315         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5316                 action = PF_DROP;
5317                 REASON_SET(&reason, PFRES_SHORT);
5318                 log = 1;
5319                 goto done;
5320         }
5321
5322         /* We do IP header normalization and packet reassembly here */
5323         if (pf_normalize_ip(m0, dir, kif, &reason) != PF_PASS) {
5324                 action = PF_DROP;
5325                 goto done;
5326         }
5327         m = *m0;
5328         h = mtod(m, struct ip *);
5329
5330         off = h->ip_hl << 2;
5331         if (off < (int)sizeof(*h)) {
5332                 action = PF_DROP;
5333                 REASON_SET(&reason, PFRES_SHORT);
5334                 log = 1;
5335                 goto done;
5336         }
5337
5338         pd.src = (struct pf_addr *)&h->ip_src;
5339         pd.dst = (struct pf_addr *)&h->ip_dst;
5340         PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
5341         pd.ip_sum = &h->ip_sum;
5342         pd.proto = h->ip_p;
5343         pd.af = AF_INET;
5344         pd.tos = h->ip_tos;
5345         pd.tot_len = h->ip_len;
5346
5347         /* handle fragments that didn't get reassembled by normalization */
5348         if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5349                 action = pf_test_fragment(&r, dir, kif, m, h,
5350                     &pd, &a, &ruleset);
5351                 goto done;
5352         }
5353
5354         switch (h->ip_p) {
5355
5356         case IPPROTO_TCP: {
5357                 struct tcphdr   th;
5358
5359                 pd.hdr.tcp = &th;
5360                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5361                     &action, &reason, AF_INET)) {
5362                         log = action != PF_PASS;
5363                         goto done;
5364                 }
5365                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5366                     h->ip_len - off, IPPROTO_TCP, AF_INET)) {
5367                         action = PF_DROP;
5368                         goto done;
5369                 }
5370                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5371                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5372                         pqid = 1;
5373                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5374                 if (action == PF_DROP)
5375                         goto done;
5376                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5377                     &reason);
5378                 if (action == PF_PASS) {
5379 #if NPFSYNC
5380                         pfsync_update_state(s);
5381 #endif
5382                         r = s->rule.ptr;
5383                         a = s->anchor.ptr;
5384                         log = s->log;
5385                 } else if (s == NULL)
5386                         action = pf_test_tcp(&r, &s, dir, kif,
5387                             m, off, h, &pd, &a, &ruleset);
5388                 break;
5389         }
5390
5391         case IPPROTO_UDP: {
5392                 struct udphdr   uh;
5393
5394                 pd.hdr.udp = &uh;
5395                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5396                     &action, &reason, AF_INET)) {
5397                         log = action != PF_PASS;
5398                         goto done;
5399                 }
5400                 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5401                     off, h->ip_len - off, IPPROTO_UDP, AF_INET)) {
5402                         action = PF_DROP;
5403                         goto done;
5404                 }
5405                 if (uh.uh_dport == 0 ||
5406                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5407                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5408                         action = PF_DROP;
5409                         goto done;
5410                 }
5411                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5412                 if (action == PF_PASS) {
5413 #if NPFSYNC
5414                         pfsync_update_state(s);
5415 #endif
5416                         r = s->rule.ptr;
5417                         a = s->anchor.ptr;
5418                         log = s->log;
5419                 } else if (s == NULL)
5420                         action = pf_test_udp(&r, &s, dir, kif,
5421                             m, off, h, &pd, &a, &ruleset);
5422                 break;
5423         }
5424
5425         case IPPROTO_ICMP: {
5426                 struct icmp     ih;
5427
5428                 pd.hdr.icmp = &ih;
5429                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5430                     &action, &reason, AF_INET)) {
5431                         log = action != PF_PASS;
5432                         goto done;
5433                 }
5434                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5435                     h->ip_len - off, IPPROTO_ICMP, AF_INET)) {
5436                         action = PF_DROP;
5437                         goto done;
5438                 }
5439                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &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_icmp(&r, &s, dir, kif,
5449                             m, off, h, &pd, &a, &ruleset);
5450                 break;
5451         }
5452
5453         default:
5454                 action = pf_test_state_other(&s, dir, kif, &pd);
5455                 if (action == PF_PASS) {
5456 #if NPFSYNC
5457                         pfsync_update_state(s);
5458 #endif
5459                         r = s->rule.ptr;
5460                         a = s->anchor.ptr;
5461                         log = s->log;
5462                 } else if (s == NULL)
5463                         action = pf_test_other(&r, &s, dir, kif, m, off, h,
5464                             &pd, &a, &ruleset);
5465                 break;
5466         }
5467
5468 done:
5469         if (action == PF_PASS && h->ip_hl > 5 &&
5470             !((s && s->allow_opts) || r->allow_opts)) {
5471                 action = PF_DROP;
5472                 REASON_SET(&reason, PFRES_SHORT);
5473                 log = 1;
5474                 DPFPRINTF(PF_DEBUG_MISC,
5475                     ("pf: dropping packet with ip options\n"));
5476         }
5477
5478 #ifdef ALTQ
5479         if (action == PF_PASS && r->qid) {
5480                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
5481                 if (pd.tos == IPTOS_LOWDELAY)
5482                         m->m_pkthdr.altq_qid = r->pqid;
5483                 else
5484                         m->m_pkthdr.altq_qid = r->qid;
5485                 if (s) {
5486                         m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED;
5487                         m->m_pkthdr.altq_state_hash = pf_state_hash(s);
5488                 }
5489                 m->m_pkthdr.ecn_af = AF_INET;
5490                 m->m_pkthdr.header = h;
5491         }
5492 #endif
5493
5494         /*
5495          * connections redirected to loopback should not match sockets
5496          * bound specifically to loopback due to security implications,
5497          * see tcp_input() and in_pcblookup_listen().
5498          */
5499         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5500             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5501             (s->nat_rule.ptr->action == PF_RDR ||
5502             s->nat_rule.ptr->action == PF_BINAT) &&
5503             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
5504                 action = PF_DROP;
5505                 REASON_SET(&reason, PFRES_MEMORY);
5506         }
5507
5508         m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5509
5510         if (log)
5511                 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset);
5512
5513         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5514         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
5515
5516         if (action == PF_PASS || r->action == PF_DROP) {
5517                 r->packets++;
5518                 r->bytes += pd.tot_len;
5519                 if (a != NULL) {
5520                         a->packets++;
5521                         a->bytes += pd.tot_len;
5522                 }
5523                 if (s != NULL) {
5524                         dirndx = (dir == s->direction) ? 0 : 1;
5525                         s->packets[dirndx]++;
5526                         s->bytes[dirndx] += pd.tot_len;
5527                         if (s->nat_rule.ptr != NULL) {
5528                                 s->nat_rule.ptr->packets++;
5529                                 s->nat_rule.ptr->bytes += pd.tot_len;
5530                         }
5531                         if (s->src_node != NULL) {
5532                                 s->src_node->packets++;
5533                                 s->src_node->bytes += pd.tot_len;
5534                         }
5535                         if (s->nat_src_node != NULL) {
5536                                 s->nat_src_node->packets++;
5537                                 s->nat_src_node->bytes += pd.tot_len;
5538                         }
5539                 }
5540                 tr = r;
5541                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5542                 if (nr != NULL) {
5543                         struct pf_addr *x;
5544                         /*
5545                          * XXX: we need to make sure that the addresses
5546                          * passed to pfr_update_stats() are the same than
5547                          * the addresses used during matching (pfr_match)
5548                          */
5549                         if (r == &pf_default_rule) {
5550                                 tr = nr;
5551                                 x = (s == NULL || s->direction == dir) ?
5552                                     &pd.baddr : &pd.naddr;
5553                         } else
5554                                 x = (s == NULL || s->direction == dir) ?
5555                                     &pd.naddr : &pd.baddr;
5556                         if (x == &pd.baddr || s == NULL) {
5557                                 /* we need to change the address */
5558                                 if (dir == PF_OUT)
5559                                         pd.src = x;
5560                                 else
5561                                         pd.dst = x;
5562                         }
5563                 }
5564                 if (tr->src.addr.type == PF_ADDR_TABLE)
5565                         pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5566                             s->direction == dir) ? pd.src : pd.dst, pd.af,
5567                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5568                             tr->src.not);
5569                 if (tr->dst.addr.type == PF_ADDR_TABLE)
5570                         pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5571                             s->direction == dir) ? pd.dst : pd.src, pd.af,
5572                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5573                             tr->dst.not);
5574         }
5575
5576
5577         if (action == PF_SYNPROXY_DROP) {
5578                 m_freem(*m0);
5579                 *m0 = NULL;
5580                 action = PF_PASS;
5581         } else if (r->rt)
5582                 /* pf_route can free the mbuf causing *m0 to become NULL */
5583                 pf_route(m0, r, dir, ifp, s);
5584
5585         return (action);
5586 }
5587 #endif /* INET */
5588
5589 #ifdef INET6
5590 int
5591 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0)
5592 {
5593         struct pfi_kif          *kif;
5594         u_short                  action, reason = 0, log = 0;
5595         struct mbuf             *m = *m0;
5596         struct ip6_hdr          *h = NULL;
5597         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5598         struct pf_state         *s = NULL;
5599         struct pf_ruleset       *ruleset = NULL;
5600         struct pf_pdesc          pd;
5601         int                      off, terminal = 0, dirndx;
5602
5603         if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED))
5604                 return (PF_PASS);
5605
5606         kif = pfi_index2kif[ifp->if_index];
5607         if (kif == NULL)
5608                 return (PF_DROP);
5609
5610 #ifdef DIAGNOSTIC
5611         if ((m->m_flags & M_PKTHDR) == 0)
5612                 panic("non-M_PKTHDR is passed to pf_test");
5613 #endif
5614
5615         memset(&pd, 0, sizeof(pd));
5616         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5617                 action = PF_DROP;
5618                 REASON_SET(&reason, PFRES_SHORT);
5619                 log = 1;
5620                 goto done;
5621         }
5622
5623         /* We do IP header normalization and packet reassembly here */
5624         if (pf_normalize_ip6(m0, dir, kif, &reason) != PF_PASS) {
5625                 action = PF_DROP;
5626                 goto done;
5627         }
5628         m = *m0;
5629         h = mtod(m, struct ip6_hdr *);
5630
5631         pd.src = (struct pf_addr *)&h->ip6_src;
5632         pd.dst = (struct pf_addr *)&h->ip6_dst;
5633         PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
5634         pd.ip_sum = NULL;
5635         pd.af = AF_INET6;
5636         pd.tos = 0;
5637         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
5638
5639         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
5640         pd.proto = h->ip6_nxt;
5641         do {
5642                 switch (pd.proto) {
5643                 case IPPROTO_FRAGMENT:
5644                         action = pf_test_fragment(&r, dir, kif, m, h,
5645                             &pd, &a, &ruleset);
5646                         if (action == PF_DROP)
5647                                 REASON_SET(&reason, PFRES_FRAG);
5648                         goto done;
5649                 case IPPROTO_AH:
5650                 case IPPROTO_HOPOPTS:
5651                 case IPPROTO_ROUTING:
5652                 case IPPROTO_DSTOPTS: {
5653                         /* get next header and header length */
5654                         struct ip6_ext  opt6;
5655
5656                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
5657                             NULL, NULL, pd.af)) {
5658                                 DPFPRINTF(PF_DEBUG_MISC,
5659                                     ("pf: IPv6 short opt\n"));
5660                                 action = PF_DROP;
5661                                 REASON_SET(&reason, PFRES_SHORT);
5662                                 log = 1;
5663                                 goto done;
5664                         }
5665                         if (pd.proto == IPPROTO_AH)
5666                                 off += (opt6.ip6e_len + 2) * 4;
5667                         else
5668                                 off += (opt6.ip6e_len + 1) * 8;
5669                         pd.proto = opt6.ip6e_nxt;
5670                         /* goto the next header */
5671                         break;
5672                 }
5673                 default:
5674                         terminal++;
5675                         break;
5676                 }
5677         } while (!terminal);
5678
5679         switch (pd.proto) {
5680
5681         case IPPROTO_TCP: {
5682                 struct tcphdr   th;
5683
5684                 pd.hdr.tcp = &th;
5685                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5686                     &action, &reason, AF_INET6)) {
5687                         log = action != PF_PASS;
5688                         goto done;
5689                 }
5690                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5691                     ntohs(h->ip6_plen), IPPROTO_TCP, AF_INET6)) {
5692                         action = PF_DROP;
5693                         goto done;
5694                 }
5695                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5696                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5697                 if (action == PF_DROP)
5698                         goto done;
5699                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5700                     &reason);
5701                 if (action == PF_PASS) {
5702 #if NPFSYNC
5703                         pfsync_update_state(s);
5704 #endif
5705                         r = s->rule.ptr;
5706                         a = s->anchor.ptr;
5707                         log = s->log;
5708                 } else if (s == NULL)
5709                         action = pf_test_tcp(&r, &s, dir, kif,
5710                             m, off, h, &pd, &a, &ruleset);
5711                 break;
5712         }
5713
5714         case IPPROTO_UDP: {
5715                 struct udphdr   uh;
5716
5717                 pd.hdr.udp = &uh;
5718                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5719                     &action, &reason, AF_INET6)) {
5720                         log = action != PF_PASS;
5721                         goto done;
5722                 }
5723                 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5724                     off, ntohs(h->ip6_plen), IPPROTO_UDP, AF_INET6)) {
5725                         action = PF_DROP;
5726                         goto done;
5727                 }
5728                 if (uh.uh_dport == 0 ||
5729                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5730                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5731                         action = PF_DROP;
5732                         goto done;
5733                 }
5734                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5735                 if (action == PF_PASS) {
5736 #if NPFSYNC
5737                         pfsync_update_state(s);
5738 #endif
5739                         r = s->rule.ptr;
5740                         a = s->anchor.ptr;
5741                         log = s->log;
5742                 } else if (s == NULL)
5743                         action = pf_test_udp(&r, &s, dir, kif,
5744                             m, off, h, &pd, &a, &ruleset);
5745                 break;
5746         }
5747
5748         case IPPROTO_ICMPV6: {
5749                 struct icmp6_hdr        ih;
5750
5751                 pd.hdr.icmp6 = &ih;
5752                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
5753                     &action, &reason, AF_INET6)) {
5754                         log = action != PF_PASS;
5755                         goto done;
5756                 }
5757                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5758                     ntohs(h->ip6_plen), IPPROTO_ICMPV6, AF_INET6)) {
5759                         action = PF_DROP;
5760                         goto done;
5761                 }
5762                 action = pf_test_state_icmp(&s, dir, kif,
5763                     m, off, h, &pd);
5764                 if (action == PF_PASS) {
5765 #if NPFSYNC
5766                         pfsync_update_state(s);
5767 #endif
5768                         r = s->rule.ptr;
5769                         a = s->anchor.ptr;
5770                         log = s->log;
5771                 } else if (s == NULL)
5772                         action = pf_test_icmp(&r, &s, dir, kif,
5773                             m, off, h, &pd, &a, &ruleset);
5774                 break;
5775         }
5776
5777         default:
5778                 action = pf_test_state_other(&s, dir, kif, &pd);
5779                 if (action == PF_PASS) {
5780                         r = s->rule.ptr;
5781                         a = s->anchor.ptr;
5782                         log = s->log;
5783                 } else if (s == NULL)
5784                         action = pf_test_other(&r, &s, dir, kif, m, off, h,
5785                             &pd, &a, &ruleset);
5786                 break;
5787         }
5788
5789 done:
5790         /* XXX handle IPv6 options, if not allowed. not implemented. */
5791
5792 #ifdef ALTQ
5793         if (action == PF_PASS && r->qid) {
5794                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
5795                 if (pd.tos == IPTOS_LOWDELAY)
5796                         m->m_pkthdr.altq_qid = r->pqid;
5797                 else
5798                         m->m_pkthdr.altq_qid = r->qid;
5799                 if (s) {
5800                         m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED;
5801                         m->m_pkthdr.altq_state_hash = pf_state_hash(s);
5802                 }
5803                 m->m_pkthdr.ecn_af = AF_INET6;
5804                 m->m_pkthdr.header = h;
5805         }
5806 #endif
5807
5808         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5809             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5810             (s->nat_rule.ptr->action == PF_RDR ||
5811             s->nat_rule.ptr->action == PF_BINAT) &&
5812             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) {
5813                 action = PF_DROP;
5814                 REASON_SET(&reason, PFRES_MEMORY);
5815         }
5816
5817         m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5818
5819         if (log)
5820                 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset);
5821
5822         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5823         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
5824
5825         if (action == PF_PASS || r->action == PF_DROP) {
5826                 r->packets++;
5827                 r->bytes += pd.tot_len;
5828                 if (a != NULL) {
5829                         a->packets++;
5830                         a->bytes += pd.tot_len;
5831                 }
5832                 if (s != NULL) {
5833                         dirndx = (dir == s->direction) ? 0 : 1;
5834                         s->packets[dirndx]++;
5835                         s->bytes[dirndx] += pd.tot_len;
5836                         if (s->nat_rule.ptr != NULL) {
5837                                 s->nat_rule.ptr->packets++;
5838                                 s->nat_rule.ptr->bytes += pd.tot_len;
5839                         }
5840                         if (s->src_node != NULL) {
5841                                 s->src_node->packets++;
5842                                 s->src_node->bytes += pd.tot_len;
5843                         }
5844                         if (s->nat_src_node != NULL) {
5845                                 s->nat_src_node->packets++;
5846                                 s->nat_src_node->bytes += pd.tot_len;
5847                         }
5848                 }
5849                 tr = r;
5850                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5851                 if (nr != NULL) {
5852                         struct pf_addr *x;
5853                         /*
5854                          * XXX: we need to make sure that the addresses
5855                          * passed to pfr_update_stats() are the same than
5856                          * the addresses used during matching (pfr_match)
5857                          */
5858                         if (r == &pf_default_rule) {
5859                                 tr = nr;
5860                                 x = (s == NULL || s->direction == dir) ?
5861                                     &pd.baddr : &pd.naddr;
5862                         } else {
5863                                 x = (s == NULL || s->direction == dir) ?
5864                                     &pd.naddr : &pd.baddr;
5865                         }
5866                         if (x == &pd.baddr || s == NULL) {
5867                                 if (dir == PF_OUT)
5868                                         pd.src = x;
5869                                 else
5870                                         pd.dst = x;
5871                         }
5872                 }
5873                 if (tr->src.addr.type == PF_ADDR_TABLE)
5874                         pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5875                             s->direction == dir) ? pd.src : pd.dst, pd.af,
5876                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5877                             tr->src.not);
5878                 if (tr->dst.addr.type == PF_ADDR_TABLE)
5879                         pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5880                             s->direction == dir) ? pd.dst : pd.src, pd.af,
5881                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5882                             tr->dst.not);
5883         }
5884
5885
5886         if (action == PF_SYNPROXY_DROP) {
5887                 m_freem(*m0);
5888                 *m0 = NULL;
5889                 action = PF_PASS;
5890         } else if (r->rt)
5891                 /* pf_route6 can free the mbuf causing *m0 to become NULL */
5892                 pf_route6(m0, r, dir, ifp, s);
5893
5894         return (action);
5895 }
5896 #endif /* INET6 */