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 1.20 2008/06/05 18:06:32 swildner Exp $ */
   5
   6 /*
   7  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
   8  *
   9  * Copyright (c) 2001 Daniel Hartmeier
  10  * Copyright (c) 2002,2003 Henning Brauer
  11  * All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  *
  17  *    - Redistributions of source code must retain the above copyright
  18  *      notice, this list of conditions and the following disclaimer.
  19  *    - Redistributions in binary form must reproduce the above
  20  *      copyright notice, this list of conditions and the following
  21  *      disclaimer in the documentation and/or other materials provided
  22  *      with the distribution.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  27  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  28  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  30  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  31  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  32  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  34  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Effort sponsored in part by the Defense Advanced Research Projects
  38  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  39  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  40  *
  41  */
  42
  43 #include "opt_inet.h"
  44 #include "opt_inet6.h"
  45 #include "use_pfsync.h"
  46
  47 #include <sys/param.h>
  48 #include <sys/systm.h>
  49 #include <sys/malloc.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/filio.h>
  52 #include <sys/socket.h>
  53 #include <sys/socketvar.h>
  54 #include <sys/kernel.h>
  55 #include <sys/time.h>
  56 #include <sys/sysctl.h>
  57 #include <sys/endian.h>
  58 #include <vm/vm_zone.h>
  59
  60 #include <machine/inttypes.h>
  61
  62 #include <net/if.h>
  63 #include <net/if_types.h>
  64 #include <net/bpf.h>
  65 #include <net/netisr.h>
  66 #include <net/route.h>
  67
  68 #include <netinet/in.h>
  69 #include <netinet/in_var.h>
  70 #include <netinet/in_systm.h>
  71 #include <netinet/ip.h>
  72 #include <netinet/ip_var.h>
  73 #include <netinet/tcp.h>
  74 #include <netinet/tcp_seq.h>
  75 #include <netinet/udp.h>
  76 #include <netinet/ip_icmp.h>
  77 #include <netinet/in_pcb.h>
  78 #include <netinet/tcp_timer.h>
  79 #include <netinet/tcp_var.h>
  80 #include <netinet/udp_var.h>
  81 #include <netinet/icmp_var.h>
  82
  83 #include <net/pf/pfvar.h>
  84 #include <net/pf/if_pflog.h>
  85
  86 #if NPFSYNC > 0
  87 #include <net/pf/if_pfsync.h>
  88 #endif /* NPFSYNC > 0 */
  89
  90 #ifdef INET6
  91 #include <netinet/ip6.h>
  92 #include <netinet/in_pcb.h>
  93 #include <netinet/icmp6.h>
  94 #include <netinet6/nd6.h>
  95 #include <netinet6/ip6_var.h>
  96 #include <netinet6/in6_pcb.h>
  97 #endif /* INET6 */
  98
  99 #include <sys/in_cksum.h>
 100 #include <sys/ucred.h>
 101 #include <machine/limits.h>
 102 #include <sys/msgport2.h>
 103 #include <net/netmsg2.h>
 104
 105 extern int ip_optcopy(struct ip *, struct ip *);
 106
 107 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
 108
 109 /*
 110  * Global variables
 111  */
 112
 113 struct pf_anchorqueue    pf_anchors;
 114 struct pf_ruleset        pf_main_ruleset;
 115 struct pf_altqqueue      pf_altqs[2];
 116 struct pf_palist         pf_pabuf;
 117 struct pf_altqqueue     *pf_altqs_active;
 118 struct pf_altqqueue     *pf_altqs_inactive;
 119 struct pf_status         pf_status;
 120
 121 u_int32_t                ticket_altqs_active;
 122 u_int32_t                ticket_altqs_inactive;
 123 int                      altqs_inactive_open;
 124 u_int32_t                ticket_pabuf;
 125
 126 struct callout           pf_expire_to;                  /* expire timeout */
 127
 128 vm_zone_t                pf_src_tree_pl, pf_rule_pl;
 129 vm_zone_t                pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
 130
 131 void                     pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
 132 void                     pf_print_state(struct pf_state *);
 133 void                     pf_print_flags(u_int8_t);
 134
 135 u_int16_t                pf_cksum_fixup(u_int16_t, u_int16_t, u_int16_t,
 136                             u_int8_t);
 137 void                     pf_change_ap(struct pf_addr *, u_int16_t *,
 138                             u_int16_t *, u_int16_t *, struct pf_addr *,
 139                             u_int16_t, u_int8_t, sa_family_t);
 140 #ifdef INET6
 141 void                     pf_change_a6(struct pf_addr *, u_int16_t *,
 142                             struct pf_addr *, u_int8_t);
 143 #endif /* INET6 */
 144 void                     pf_change_icmp(struct pf_addr *, u_int16_t *,
 145                             struct pf_addr *, struct pf_addr *, u_int16_t,
 146                             u_int16_t *, u_int16_t *, u_int16_t *,
 147                             u_int16_t *, u_int8_t, sa_family_t);
 148 void                     pf_send_tcp(const struct pf_rule *, sa_family_t,
 149                             const struct pf_addr *, const struct pf_addr *,
 150                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 151                             u_int8_t, u_int16_t, u_int16_t, u_int8_t);
 152 void                     pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 153                             sa_family_t, struct pf_rule *);
 154 struct pf_rule          *pf_match_translation(struct pf_pdesc *, struct mbuf *,
 155                             int, int, struct pfi_kif *,
 156                             struct pf_addr *, u_int16_t, struct pf_addr *,
 157                             u_int16_t, int);
 158 struct pf_rule          *pf_get_translation(struct pf_pdesc *, struct mbuf *,
 159                             int, int, struct pfi_kif *, struct pf_src_node **,
 160                             struct pf_addr *, u_int16_t,
 161                             struct pf_addr *, u_int16_t,
 162                             struct pf_addr *, u_int16_t *);
 163 int                      pf_test_tcp(struct pf_rule **, struct pf_state **,
 164                             int, struct pfi_kif *, struct mbuf *, int,
 165                             void *, struct pf_pdesc *, struct pf_rule **,
 166                             struct pf_ruleset **);
 167 int                      pf_test_udp(struct pf_rule **, struct pf_state **,
 168                             int, struct pfi_kif *, struct mbuf *, int,
 169                             void *, struct pf_pdesc *, struct pf_rule **,
 170                             struct pf_ruleset **);
 171 int                      pf_test_icmp(struct pf_rule **, struct pf_state **,
 172                             int, struct pfi_kif *, struct mbuf *, int,
 173                             void *, struct pf_pdesc *, struct pf_rule **,
 174                             struct pf_ruleset **);
 175 int                      pf_test_other(struct pf_rule **, struct pf_state **,
 176                             int, struct pfi_kif *, struct mbuf *, int, void *,
 177                             struct pf_pdesc *, struct pf_rule **,
 178                             struct pf_ruleset **);
 179 int                      pf_test_fragment(struct pf_rule **, int,
 180                             struct pfi_kif *, struct mbuf *, void *,
 181                             struct pf_pdesc *, struct pf_rule **,
 182                             struct pf_ruleset **);
 183 int                      pf_test_state_tcp(struct pf_state **, int,
 184                             struct pfi_kif *, struct mbuf *, int,
 185                             void *, struct pf_pdesc *, u_short *);
 186 int                      pf_test_state_udp(struct pf_state **, int,
 187                             struct pfi_kif *, struct mbuf *, int,
 188                             void *, struct pf_pdesc *);
 189 int                      pf_test_state_icmp(struct pf_state **, int,
 190                             struct pfi_kif *, struct mbuf *, int,
 191                             void *, struct pf_pdesc *);
 192 int                      pf_test_state_other(struct pf_state **, int,
 193                             struct pfi_kif *, struct pf_pdesc *);
 194 static int               pf_match_tag(struct mbuf *, struct pf_rule *,
 195                                       struct pf_rule *, int *);
 196 void                     pf_hash(struct pf_addr *, struct pf_addr *,
 197                             struct pf_poolhashkey *, sa_family_t);
 198 int                      pf_map_addr(u_int8_t, struct pf_rule *,
 199                             struct pf_addr *, struct pf_addr *,
 200                             struct pf_addr *, struct pf_src_node **);
 201 int                      pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
 202                             struct pf_addr *, struct pf_addr *, u_int16_t,
 203                             struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
 204                             struct pf_src_node **);
 205 void                     pf_route(struct mbuf **, struct pf_rule *, int,
 206                             struct ifnet *, struct pf_state *);
 207 void                     pf_route6(struct mbuf **, struct pf_rule *, int,
 208                             struct ifnet *, struct pf_state *);
 209 int                      pf_socket_lookup(uid_t *, gid_t *,
 210                             int, struct pf_pdesc *);
 211 u_int8_t                 pf_get_wscale(struct mbuf *, int, u_int16_t,
 212                             sa_family_t);
 213 u_int16_t                pf_get_mss(struct mbuf *, int, u_int16_t,
 214                             sa_family_t);
 215 u_int16_t                pf_calc_mss(struct pf_addr *, sa_family_t,
 216                                 u_int16_t);
 217 void                     pf_set_rt_ifp(struct pf_state *,
 218                             struct pf_addr *);
 219 int                      pf_check_proto_cksum(struct mbuf *, int, int,
 220                             u_int8_t, sa_family_t);
 221 int                      pf_addr_wrap_neq(struct pf_addr_wrap *,
 222                             struct pf_addr_wrap *);
 223 struct pf_state         *pf_find_state_recurse(struct pfi_kif *,
 224                             struct pf_state *, u_int8_t);
 225
 226 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX];
 227
 228 #define STATE_LOOKUP()                                                  \
 229         do {                                                            \
 230                 if (direction == PF_IN)                                 \
 231                         *state = pf_find_state_recurse(         \
 232                             kif, &key, PF_EXT_GWY);                     \
 233                 else                                                    \
 234                         *state = pf_find_state_recurse(         \
 235                             kif, &key, PF_LAN_EXT);                     \
 236                 if (*state == NULL)                                     \
 237                         return (PF_DROP);                               \
 238                 if (direction == PF_OUT &&                              \
 239                     (((*state)->rule.ptr->rt == PF_ROUTETO &&           \
 240                     (*state)->rule.ptr->direction == PF_OUT) ||         \
 241                     ((*state)->rule.ptr->rt == PF_REPLYTO &&            \
 242                     (*state)->rule.ptr->direction == PF_IN)) &&         \
 243                     (*state)->rt_kif != NULL &&                         \
 244                     (*state)->rt_kif != kif)                            \
 245                         return (PF_PASS);                               \
 246         } while (0)
 247
 248 #define STATE_TRANSLATE(s) \
 249         (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \
 250         ((s)->af == AF_INET6 && \
 251         ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \
 252         (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \
 253         (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \
 254         (s)->lan.port != (s)->gwy.port
 255
 256 #define BOUND_IFACE(r, k) (((r)->rule_flag & PFRULE_IFBOUND) ? (k) :   \
 257         ((r)->rule_flag & PFRULE_GRBOUND) ? (k)->pfik_parent :         \
 258         (k)->pfik_parent->pfik_parent)
 259
 260 static int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
 261 static int pf_state_compare_lan_ext(struct pf_state *,
 262         struct pf_state *);
 263 static int pf_state_compare_ext_gwy(struct pf_state *,
 264         struct pf_state *);
 265 static int pf_state_compare_id(struct pf_state *,
 266         struct pf_state *);
 267
 268 struct pf_src_tree tree_src_tracking;
 269
 270 struct pf_state_tree_id tree_id;
 271 struct pf_state_queue state_updates;
 272
 273 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
 274 RB_GENERATE(pf_state_tree_lan_ext, pf_state,
 275     u.s.entry_lan_ext, pf_state_compare_lan_ext);
 276 RB_GENERATE(pf_state_tree_ext_gwy, pf_state,
 277     u.s.entry_ext_gwy, pf_state_compare_ext_gwy);
 278 RB_GENERATE(pf_state_tree_id, pf_state,
 279     u.s.entry_id, pf_state_compare_id);
 280
 281 static int
 282 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
 283 {
 284         int     diff;
 285
 286         if (a->rule.ptr > b->rule.ptr)
 287                 return (1);
 288         if (a->rule.ptr < b->rule.ptr)
 289                 return (-1);
 290         if ((diff = a->af - b->af) != 0)
 291                 return (diff);
 292         switch (a->af) {
 293 #ifdef INET
 294         case AF_INET:
 295                 if (a->addr.addr32[0] > b->addr.addr32[0])
 296                         return (1);
 297                 if (a->addr.addr32[0] < b->addr.addr32[0])
 298                         return (-1);
 299                 break;
 300 #endif /* INET */
 301 #ifdef INET6
 302         case AF_INET6:
 303                 if (a->addr.addr32[3] > b->addr.addr32[3])
 304                         return (1);
 305                 if (a->addr.addr32[3] < b->addr.addr32[3])
 306                         return (-1);
 307                 if (a->addr.addr32[2] > b->addr.addr32[2])
 308                         return (1);
 309                 if (a->addr.addr32[2] < b->addr.addr32[2])
 310                         return (-1);
 311                 if (a->addr.addr32[1] > b->addr.addr32[1])
 312                         return (1);
 313                 if (a->addr.addr32[1] < b->addr.addr32[1])
 314                         return (-1);
 315                 if (a->addr.addr32[0] > b->addr.addr32[0])
 316                         return (1);
 317                 if (a->addr.addr32[0] < b->addr.addr32[0])
 318                         return (-1);
 319                 break;
 320 #endif /* INET6 */
 321         }
 322         return (0);
 323 }
 324
 325 u_int32_t
 326 pf_state_hash(struct pf_state *s)
 327 {
 328         u_int32_t hv = (intptr_t)s / sizeof(*s);
 329
 330         hv ^= crc32(&s->lan, sizeof(s->lan));
 331         hv ^= crc32(&s->gwy, sizeof(s->gwy));
 332         hv ^= crc32(&s->ext, sizeof(s->ext));
 333         if (hv == 0)    /* disallow 0 */
 334                 hv = 1;
 335         return(hv);
 336 }
 337
 338 static int
 339 pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b)
 340 {
 341         int     diff;
 342
 343         if ((diff = a->proto - b->proto) != 0)
 344                 return (diff);
 345         if ((diff = a->af - b->af) != 0)
 346                 return (diff);
 347         switch (a->af) {
 348 #ifdef INET
 349         case AF_INET:
 350                 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
 351                         return (1);
 352                 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
 353                         return (-1);
 354                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 355                         return (1);
 356                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 357                         return (-1);
 358                 break;
 359 #endif /* INET */
 360 #ifdef INET6
 361         case AF_INET6:
 362                 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
 363                         return (1);
 364                 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
 365                         return (-1);
 366                 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
 367                         return (1);
 368                 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
 369                         return (-1);
 370                 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
 371                         return (1);
 372                 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
 373                         return (-1);
 374                 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
 375                         return (1);
 376                 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
 377                         return (-1);
 378                 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
 379                         return (1);
 380                 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
 381                         return (-1);
 382                 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
 383                         return (1);
 384                 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
 385                         return (-1);
 386                 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
 387                         return (1);
 388                 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
 389                         return (-1);
 390                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 391                         return (1);
 392                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 393                         return (-1);
 394                 break;
 395 #endif /* INET6 */
 396         }
 397
 398         if ((diff = a->lan.port - b->lan.port) != 0)
 399                 return (diff);
 400         if ((diff = a->ext.port - b->ext.port) != 0)
 401                 return (diff);
 402
 403         return (0);
 404 }
 405
 406 static int
 407 pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b)
 408 {
 409         int     diff;
 410
 411         if ((diff = a->proto - b->proto) != 0)
 412                 return (diff);
 413         if ((diff = a->af - b->af) != 0)
 414                 return (diff);
 415         switch (a->af) {
 416 #ifdef INET
 417         case AF_INET:
 418                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 419                         return (1);
 420                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 421                         return (-1);
 422                 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
 423                         return (1);
 424                 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
 425                         return (-1);
 426                 break;
 427 #endif /* INET */
 428 #ifdef INET6
 429         case AF_INET6:
 430                 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
 431                         return (1);
 432                 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
 433                         return (-1);
 434                 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
 435                         return (1);
 436                 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
 437                         return (-1);
 438                 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
 439                         return (1);
 440                 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
 441                         return (-1);
 442                 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
 443                         return (1);
 444                 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
 445                         return (-1);
 446                 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
 447                         return (1);
 448                 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
 449                         return (-1);
 450                 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
 451                         return (1);
 452                 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
 453                         return (-1);
 454                 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
 455                         return (1);
 456                 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
 457                         return (-1);
 458                 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
 459                         return (1);
 460                 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
 461                         return (-1);
 462                 break;
 463 #endif /* INET6 */
 464         }
 465
 466         if ((diff = a->ext.port - b->ext.port) != 0)
 467                 return (diff);
 468         if ((diff = a->gwy.port - b->gwy.port) != 0)
 469                 return (diff);
 470
 471         return (0);
 472 }
 473
 474 static int
 475 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
 476 {
 477         if (a->id > b->id)
 478                 return (1);
 479         if (a->id < b->id)
 480                 return (-1);
 481         if (a->creatorid > b->creatorid)
 482                 return (1);
 483         if (a->creatorid < b->creatorid)
 484                 return (-1);
 485
 486         return (0);
 487 }
 488
 489 #ifdef INET6
 490 void
 491 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 492 {
 493         switch (af) {
 494 #ifdef INET
 495         case AF_INET:
 496                 dst->addr32[0] = src->addr32[0];
 497                 break;
 498 #endif /* INET */
 499         case AF_INET6:
 500                 dst->addr32[0] = src->addr32[0];
 501                 dst->addr32[1] = src->addr32[1];
 502                 dst->addr32[2] = src->addr32[2];
 503                 dst->addr32[3] = src->addr32[3];
 504                 break;
 505         }
 506 }
 507 #endif
 508
 509 struct pf_state *
 510 pf_find_state_byid(struct pf_state *key)
 511 {
 512         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 513         return (RB_FIND(pf_state_tree_id, &tree_id, key));
 514 }
 515
 516 struct pf_state *
 517 pf_find_state_recurse(struct pfi_kif *kif, struct pf_state *key, u_int8_t tree)
 518 {
 519         struct pf_state *s;
 520
 521         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 522
 523         switch (tree) {
 524         case PF_LAN_EXT:
 525                 for (; kif != NULL; kif = kif->pfik_parent) {
 526                         s = RB_FIND(pf_state_tree_lan_ext,
 527                             &kif->pfik_lan_ext, key);
 528                         if (s != NULL)
 529                                 return (s);
 530                 }
 531                 return (NULL);
 532         case PF_EXT_GWY:
 533                 for (; kif != NULL; kif = kif->pfik_parent) {
 534                         s = RB_FIND(pf_state_tree_ext_gwy,
 535                             &kif->pfik_ext_gwy, key);
 536                         if (s != NULL)
 537                                 return (s);
 538                 }
 539                 return (NULL);
 540         default:
 541                 panic("pf_find_state_recurse");
 542         }
 543 }
 544
 545 struct pf_state *
 546 pf_find_state_all(struct pf_state *key, u_int8_t tree, int *more)
 547 {
 548         struct pf_state *s, *ss = NULL;
 549         struct pfi_kif  *kif;
 550
 551         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 552
 553         switch (tree) {
 554         case PF_LAN_EXT:
 555                 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
 556                         s = RB_FIND(pf_state_tree_lan_ext,
 557                             &kif->pfik_lan_ext, key);
 558                         if (s == NULL)
 559                                 continue;
 560                         if (more == NULL)
 561                                 return (s);
 562                         ss = s;
 563                         (*more)++;
 564                 }
 565                 return (ss);
 566         case PF_EXT_GWY:
 567                 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
 568                         s = RB_FIND(pf_state_tree_ext_gwy,
 569                             &kif->pfik_ext_gwy, key);
 570                         if (s == NULL)
 571                                 continue;
 572                         if (more == NULL)
 573                                 return (s);
 574                         ss = s;
 575                         (*more)++;
 576                 }
 577                 return (ss);
 578         default:
 579                 panic("pf_find_state_all");
 580         }
 581 }
 582
 583 int
 584 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 585     struct pf_addr *src, sa_family_t af)
 586 {
 587         struct pf_src_node      k;
 588
 589         if (*sn == NULL) {
 590                 k.af = af;
 591                 PF_ACPY(&k.addr, src, af);
 592                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 593                     rule->rpool.opts & PF_POOL_STICKYADDR)
 594                         k.rule.ptr = rule;
 595                 else
 596                         k.rule.ptr = NULL;
 597                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
 598                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
 599         }
 600         if (*sn == NULL) {
 601                 if (!rule->max_src_nodes ||
 602                     rule->src_nodes < rule->max_src_nodes)
 603                         (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT);
 604                 if ((*sn) == NULL)
 605                         return (-1);
 606                 bzero(*sn, sizeof(struct pf_src_node));
 607                 (*sn)->af = af;
 608                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 609                     rule->rpool.opts & PF_POOL_STICKYADDR)
 610                         (*sn)->rule.ptr = rule;
 611                 else
 612                         (*sn)->rule.ptr = NULL;
 613                 PF_ACPY(&(*sn)->addr, src, af);
 614                 if (RB_INSERT(pf_src_tree,
 615                     &tree_src_tracking, *sn) != NULL) {
 616                         if (pf_status.debug >= PF_DEBUG_MISC) {
 617                                 kprintf("pf: src_tree insert failed: ");
 618                                 pf_print_host(&(*sn)->addr, 0, af);
 619                                 kprintf("\n");
 620                         }
 621                         pool_put(&pf_src_tree_pl, *sn);
 622                         return (-1);
 623                 }
 624                 (*sn)->creation = time_second;
 625                 (*sn)->ruletype = rule->action;
 626                 if ((*sn)->rule.ptr != NULL)
 627                         (*sn)->rule.ptr->src_nodes++;
 628                 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
 629                 pf_status.src_nodes++;
 630         } else {
 631                 if (rule->max_src_states &&
 632                     (*sn)->states >= rule->max_src_states)
 633                         return (-1);
 634         }
 635         return (0);
 636 }
 637
 638 int
 639 pf_insert_state(struct pfi_kif *kif, struct pf_state *state)
 640 {
 641         /* Thou MUST NOT insert multiple duplicate keys */
 642         state->u.s.kif = kif;
 643         if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) {
 644                 if (pf_status.debug >= PF_DEBUG_MISC) {
 645                         kprintf("pf: state insert failed: tree_lan_ext");
 646                         kprintf(" lan: ");
 647                         pf_print_host(&state->lan.addr, state->lan.port,
 648                             state->af);
 649                         kprintf(" gwy: ");
 650                         pf_print_host(&state->gwy.addr, state->gwy.port,
 651                             state->af);
 652                         kprintf(" ext: ");
 653                         pf_print_host(&state->ext.addr, state->ext.port,
 654                             state->af);
 655                         if (state->sync_flags & PFSTATE_FROMSYNC)
 656                                 kprintf(" (from sync)");
 657                         kprintf("\n");
 658                 }
 659                 return (-1);
 660         }
 661
 662         if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) {
 663                 if (pf_status.debug >= PF_DEBUG_MISC) {
 664                         kprintf("pf: state insert failed: tree_ext_gwy");
 665                         kprintf(" lan: ");
 666                         pf_print_host(&state->lan.addr, state->lan.port,
 667                             state->af);
 668                         kprintf(" gwy: ");
 669                         pf_print_host(&state->gwy.addr, state->gwy.port,
 670                             state->af);
 671                         kprintf(" ext: ");
 672                         pf_print_host(&state->ext.addr, state->ext.port,
 673                             state->af);
 674                         if (state->sync_flags & PFSTATE_FROMSYNC)
 675                                 kprintf(" (from sync)");
 676                         kprintf("\n");
 677                 }
 678                 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
 679                 return (-1);
 680         }
 681
 682         if (state->id == 0 && state->creatorid == 0) {
 683                 state->id = htobe64(pf_status.stateid++);
 684                 state->creatorid = pf_status.hostid;
 685         }
 686         if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) {
 687                 if (pf_status.debug >= PF_DEBUG_MISC) {
 688                         kprintf("pf: state insert failed: "
 689                             "id: %016" PRIx64 " creatorid: %08" PRIx32,
 690                             be64toh(state->id), ntohl(state->creatorid));
 691                         if (state->sync_flags & PFSTATE_FROMSYNC)
 692                                 kprintf(" (from sync)");
 693                         kprintf("\n");
 694                 }
 695                 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
 696                 RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state);
 697                 return (-1);
 698         }
 699         TAILQ_INSERT_HEAD(&state_updates, state, u.s.entry_updates);
 700
 701         pf_status.fcounters[FCNT_STATE_INSERT]++;
 702         pf_status.states++;
 703         pfi_attach_state(kif);
 704 #if NPFSYNC
 705         pfsync_insert_state(state);
 706 #endif
 707         return (0);
 708 }
 709
 710 void
 711 pf_purge_timeout(void *arg)
 712 {
 713         struct callout  *to = arg;
 714
 715         crit_enter();
 716         pf_purge_expired_states();
 717         pf_purge_expired_fragments();
 718         pf_purge_expired_src_nodes();
 719         crit_exit();
 720
 721         callout_reset(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz,
 722             pf_purge_timeout, to);
 723 }
 724
 725 u_int32_t
 726 pf_state_expires(const struct pf_state *state)
 727 {
 728         u_int32_t       timeout;
 729         u_int32_t       start;
 730         u_int32_t       end;
 731         u_int32_t       states;
 732
 733         /* handle all PFTM_* > PFTM_MAX here */
 734         if (state->timeout == PFTM_PURGE)
 735                 return (time_second);
 736         if (state->timeout == PFTM_UNTIL_PACKET)
 737                 return (0);
 738         KASSERT((state->timeout < PFTM_MAX),
 739             ("pf_state_expires: timeout > PFTM_MAX"));
 740         timeout = state->rule.ptr->timeout[state->timeout];
 741         if (!timeout)
 742                 timeout = pf_default_rule.timeout[state->timeout];
 743         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
 744         if (start) {
 745                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
 746                 states = state->rule.ptr->states;
 747         } else {
 748                 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
 749                 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
 750                 states = pf_status.states;
 751         }
 752         if (end && states > start && start < end) {
 753                 if (states < end)
 754                         return (state->expire + timeout * (end - states) /
 755                             (end - start));
 756                 else
 757                         return (time_second);
 758         }
 759         return (state->expire + timeout);
 760 }
 761
 762 void
 763 pf_purge_expired_src_nodes(void)
 764 {
 765          struct pf_src_node             *cur, *next;
 766
 767          for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
 768                  next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
 769
 770                  if (cur->states <= 0 && cur->expire <= time_second) {
 771                          if (cur->rule.ptr != NULL) {
 772                                  cur->rule.ptr->src_nodes--;
 773                                  if (cur->rule.ptr->states <= 0 &&
 774                                      cur->rule.ptr->max_src_nodes <= 0)
 775                                          pf_rm_rule(NULL, cur->rule.ptr);
 776                          }
 777                          RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
 778                          pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
 779                          pf_status.src_nodes--;
 780                          pool_put(&pf_src_tree_pl, cur);
 781                  }
 782          }
 783 }
 784
 785 void
 786 pf_src_tree_remove_state(struct pf_state *s)
 787 {
 788         u_int32_t timeout;
 789
 790         if (s->src_node != NULL) {
 791                 if (--s->src_node->states <= 0) {
 792                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
 793                         if (!timeout)
 794                                 timeout =
 795                                     pf_default_rule.timeout[PFTM_SRC_NODE];
 796                         s->src_node->expire = time_second + timeout;
 797                 }
 798         }
 799         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
 800                 if (--s->nat_src_node->states <= 0) {
 801                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
 802                         if (!timeout)
 803                                 timeout =
 804                                     pf_default_rule.timeout[PFTM_SRC_NODE];
 805                         s->nat_src_node->expire = time_second + timeout;
 806                 }
 807         }
 808         s->src_node = s->nat_src_node = NULL;
 809 }
 810
 811 static int
 812 pf_purge_expired_states_callback(struct pf_state *cur, void *data __unused)
 813 {
 814         if (pf_state_expires(cur) <= time_second) {
 815                 RB_REMOVE(pf_state_tree_ext_gwy,
 816                     &cur->u.s.kif->pfik_ext_gwy, cur);
 817                 RB_REMOVE(pf_state_tree_lan_ext,
 818                     &cur->u.s.kif->pfik_lan_ext, cur);
 819                 RB_REMOVE(pf_state_tree_id, &tree_id, cur);
 820                 if (cur->src.state == PF_TCPS_PROXY_DST) {
 821                         pf_send_tcp(cur->rule.ptr, cur->af,
 822                             &cur->ext.addr, &cur->lan.addr,
 823                             cur->ext.port, cur->lan.port,
 824                             cur->src.seqhi, cur->src.seqlo + 1, 0,
 825                             TH_RST|TH_ACK, 0, 0);
 826                 }
 827 #if NPFSYNC
 828                 pfsync_delete_state(cur);
 829 #endif
 830                 pf_src_tree_remove_state(cur);
 831                 if (--cur->rule.ptr->states <= 0 &&
 832                     cur->rule.ptr->src_nodes <= 0)
 833                         pf_rm_rule(NULL, cur->rule.ptr);
 834                 if (cur->nat_rule.ptr != NULL)
 835                         if (--cur->nat_rule.ptr->states <= 0 &&
 836                                 cur->nat_rule.ptr->src_nodes <= 0)
 837                                 pf_rm_rule(NULL, cur->nat_rule.ptr);
 838                 if (cur->anchor.ptr != NULL)
 839                         if (--cur->anchor.ptr->states <= 0)
 840                                 pf_rm_rule(NULL, cur->anchor.ptr);
 841                 pf_normalize_tcp_cleanup(cur);
 842                 pfi_detach_state(cur->u.s.kif);
 843                 TAILQ_REMOVE(&state_updates, cur, u.s.entry_updates);
 844                 pool_put(&pf_state_pl, cur);
 845                 pf_status.fcounters[FCNT_STATE_REMOVALS]++;
 846                 pf_status.states--;
 847         }
 848         return(0);
 849 }
 850
 851 void
 852 pf_purge_expired_states(void)
 853 {
 854         RB_SCAN(pf_state_tree_id, &tree_id, NULL,
 855                 pf_purge_expired_states_callback, NULL);
 856 }
 857
 858
 859 int
 860 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
 861 {
 862         if (aw->type != PF_ADDR_TABLE)
 863                 return (0);
 864         if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
 865                 return (1);
 866         return (0);
 867 }
 868
 869 void
 870 pf_tbladdr_remove(struct pf_addr_wrap *aw)
 871 {
 872         if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
 873                 return;
 874         pfr_detach_table(aw->p.tbl);
 875         aw->p.tbl = NULL;
 876 }
 877
 878 void
 879 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
 880 {
 881         struct pfr_ktable *kt = aw->p.tbl;
 882
 883         if (aw->type != PF_ADDR_TABLE || kt == NULL)
 884                 return;
 885         if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
 886                 kt = kt->pfrkt_root;
 887         aw->p.tbl = NULL;
 888         aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
 889                 kt->pfrkt_cnt : -1;
 890 }
 891
 892 void
 893 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
 894 {
 895         switch (af) {
 896 #ifdef INET
 897         case AF_INET: {
 898                 u_int32_t a = ntohl(addr->addr32[0]);
 899                 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
 900                     (a>>8)&255, a&255);
 901                 if (p) {
 902                         p = ntohs(p);
 903                         kprintf(":%u", p);
 904                 }
 905                 break;
 906         }
 907 #endif /* INET */
 908 #ifdef INET6
 909         case AF_INET6: {
 910                 u_int16_t b;
 911                 u_int8_t i, curstart = 255, curend = 0,
 912                     maxstart = 0, maxend = 0;
 913                 for (i = 0; i < 8; i++) {
 914                         if (!addr->addr16[i]) {
 915                                 if (curstart == 255)
 916                                         curstart = i;
 917                                 else
 918                                         curend = i;
 919                         } else {
 920                                 if (curstart) {
 921                                         if ((curend - curstart) >
 922                                             (maxend - maxstart)) {
 923                                                 maxstart = curstart;
 924                                                 maxend = curend;
 925                                                 curstart = 255;
 926                                         }
 927                                 }
 928                         }
 929                 }
 930                 for (i = 0; i < 8; i++) {
 931                         if (i >= maxstart && i <= maxend) {
 932                                 if (maxend != 7) {
 933                                         if (i == maxstart)
 934                                                 kprintf(":");
 935                                 } else {
 936                                         if (i == maxend)
 937                                                 kprintf(":");
 938                                 }
 939                         } else {
 940                                 b = ntohs(addr->addr16[i]);
 941                                 kprintf("%x", b);
 942                                 if (i < 7)
 943                                         kprintf(":");
 944                         }
 945                 }
 946                 if (p) {
 947                         p = ntohs(p);
 948                         kprintf("[%u]", p);
 949                 }
 950                 break;
 951         }
 952 #endif /* INET6 */
 953         }
 954 }
 955
 956 void
 957 pf_print_state(struct pf_state *s)
 958 {
 959         switch (s->proto) {
 960         case IPPROTO_TCP:
 961                 kprintf("TCP ");
 962                 break;
 963         case IPPROTO_UDP:
 964                 kprintf("UDP ");
 965                 break;
 966         case IPPROTO_ICMP:
 967                 kprintf("ICMP ");
 968                 break;
 969         case IPPROTO_ICMPV6:
 970                 kprintf("ICMPV6 ");
 971                 break;
 972         default:
 973                 kprintf("%u ", s->proto);
 974                 break;
 975         }
 976         pf_print_host(&s->lan.addr, s->lan.port, s->af);
 977         kprintf(" ");
 978         pf_print_host(&s->gwy.addr, s->gwy.port, s->af);
 979         kprintf(" ");
 980         pf_print_host(&s->ext.addr, s->ext.port, s->af);
 981         kprintf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
 982             s->src.seqhi, s->src.max_win, s->src.seqdiff);
 983         if (s->src.wscale && s->dst.wscale)
 984                 kprintf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
 985         kprintf("]");
 986         kprintf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
 987             s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
 988         if (s->src.wscale && s->dst.wscale)
 989                 kprintf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
 990         kprintf("]");
 991         kprintf(" %u:%u", s->src.state, s->dst.state);
 992 }
 993
 994 void
 995 pf_print_flags(u_int8_t f)
 996 {
 997         if (f)
 998                 kprintf(" ");
 999         if (f & TH_FIN)
1000                 kprintf("F");
1001         if (f & TH_SYN)
1002                 kprintf("S");
1003         if (f & TH_RST)
1004                 kprintf("R");
1005         if (f & TH_PUSH)
1006                 kprintf("P");
1007         if (f & TH_ACK)
1008                 kprintf("A");
1009         if (f & TH_URG)
1010                 kprintf("U");
1011         if (f & TH_ECE)
1012                 kprintf("E");
1013         if (f & TH_CWR)
1014                 kprintf("W");
1015 }
1016
1017 #define PF_SET_SKIP_STEPS(i)                                    \
1018         do {                                                    \
1019                 while (head[i] != cur) {                        \
1020                         head[i]->skip[i].ptr = cur;             \
1021                         head[i] = TAILQ_NEXT(head[i], entries); \
1022                 }                                               \
1023         } while (0)
1024
1025 void
1026 pf_calc_skip_steps(struct pf_rulequeue *rules)
1027 {
1028         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1029         int i;
1030
1031         cur = TAILQ_FIRST(rules);
1032         prev = cur;
1033         for (i = 0; i < PF_SKIP_COUNT; ++i)
1034                 head[i] = cur;
1035         while (cur != NULL) {
1036
1037                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1038                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1039                 if (cur->direction != prev->direction)
1040                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1041                 if (cur->af != prev->af)
1042                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
1043                 if (cur->proto != prev->proto)
1044                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1045                 if (cur->src.not != prev->src.not ||
1046                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1047                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1048                 if (cur->src.port[0] != prev->src.port[0] ||
1049                     cur->src.port[1] != prev->src.port[1] ||
1050                     cur->src.port_op != prev->src.port_op)
1051                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1052                 if (cur->dst.not != prev->dst.not ||
1053                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1054                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1055                 if (cur->dst.port[0] != prev->dst.port[0] ||
1056                     cur->dst.port[1] != prev->dst.port[1] ||
1057                     cur->dst.port_op != prev->dst.port_op)
1058                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1059
1060                 prev = cur;
1061                 cur = TAILQ_NEXT(cur, entries);
1062         }
1063         for (i = 0; i < PF_SKIP_COUNT; ++i)
1064                 PF_SET_SKIP_STEPS(i);
1065 }
1066
1067 int
1068 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1069 {
1070         if (aw1->type != aw2->type)
1071                 return (1);
1072         switch (aw1->type) {
1073         case PF_ADDR_ADDRMASK:
1074                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1075                         return (1);
1076                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1077                         return (1);
1078                 return (0);
1079         case PF_ADDR_DYNIFTL:
1080                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1081         case PF_ADDR_NOROUTE:
1082                 return (0);
1083         case PF_ADDR_TABLE:
1084                 return (aw1->p.tbl != aw2->p.tbl);
1085         default:
1086                 kprintf("invalid address type: %d\n", aw1->type);
1087                 return (1);
1088         }
1089 }
1090
1091 void
1092 pf_update_anchor_rules(void)
1093 {
1094         struct pf_rule  *rule;
1095         int              i;
1096
1097         for (i = 0; i < PF_RULESET_MAX; ++i)
1098                 TAILQ_FOREACH(rule, pf_main_ruleset.rules[i].active.ptr,
1099                     entries)
1100                         if (rule->anchorname[0])
1101                                 rule->anchor = pf_find_anchor(rule->anchorname);
1102                         else
1103                                 rule->anchor = NULL;
1104 }
1105
1106 u_int16_t
1107 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1108 {
1109         u_int32_t       l;
1110
1111         if (udp && !cksum)
1112                 return (0x0000);
1113         l = cksum + old - new;
1114         l = (l >> 16) + (l & 65535);
1115         l = l & 65535;
1116         if (udp && !l)
1117                 return (0xFFFF);
1118         return (l);
1119 }
1120
1121 void
1122 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1123     struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1124 {
1125         struct pf_addr  ao;
1126         u_int16_t       po = *p;
1127
1128         PF_ACPY(&ao, a, af);
1129         PF_ACPY(a, an, af);
1130
1131         *p = pn;
1132
1133         switch (af) {
1134 #ifdef INET
1135         case AF_INET:
1136                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1137                     ao.addr16[0], an->addr16[0], 0),
1138                     ao.addr16[1], an->addr16[1], 0);
1139                 *p = pn;
1140                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1141                     ao.addr16[0], an->addr16[0], u),
1142                     ao.addr16[1], an->addr16[1], u),
1143                     po, pn, u);
1144                 break;
1145 #endif /* INET */
1146 #ifdef INET6
1147         case AF_INET6:
1148                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1149                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1150                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1151                     ao.addr16[0], an->addr16[0], u),
1152                     ao.addr16[1], an->addr16[1], u),
1153                     ao.addr16[2], an->addr16[2], u),
1154                     ao.addr16[3], an->addr16[3], u),
1155                     ao.addr16[4], an->addr16[4], u),
1156                     ao.addr16[5], an->addr16[5], u),
1157                     ao.addr16[6], an->addr16[6], u),
1158                     ao.addr16[7], an->addr16[7], u),
1159                     po, pn, u);
1160                 break;
1161 #endif /* INET6 */
1162         }
1163 }
1164
1165
1166 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
1167 void
1168 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1169 {
1170         u_int32_t       ao;
1171
1172         memcpy(&ao, a, sizeof(ao));
1173         memcpy(a, &an, sizeof(u_int32_t));
1174         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1175             ao % 65536, an % 65536, u);
1176 }
1177
1178 #ifdef INET6
1179 void
1180 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1181 {
1182         struct pf_addr  ao;
1183
1184         PF_ACPY(&ao, a, AF_INET6);
1185         PF_ACPY(a, an, AF_INET6);
1186
1187         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1188             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1189             pf_cksum_fixup(pf_cksum_fixup(*c,
1190             ao.addr16[0], an->addr16[0], u),
1191             ao.addr16[1], an->addr16[1], u),
1192             ao.addr16[2], an->addr16[2], u),
1193             ao.addr16[3], an->addr16[3], u),
1194             ao.addr16[4], an->addr16[4], u),
1195             ao.addr16[5], an->addr16[5], u),
1196             ao.addr16[6], an->addr16[6], u),
1197             ao.addr16[7], an->addr16[7], u);
1198 }
1199 #endif /* INET6 */
1200
1201 void
1202 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1203     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1204     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1205 {
1206         struct pf_addr  oia, ooa;
1207
1208         PF_ACPY(&oia, ia, af);
1209         PF_ACPY(&ooa, oa, af);
1210
1211         /* Change inner protocol port, fix inner protocol checksum. */
1212         if (ip != NULL) {
1213                 u_int16_t       oip = *ip;
1214                 u_int32_t       opc = 0;
1215
1216                 if (pc != NULL)
1217                         opc = *pc;
1218                 *ip = np;
1219                 if (pc != NULL)
1220                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1221                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1222                 if (pc != NULL)
1223                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1224         }
1225         /* Change inner ip address, fix inner ip and icmp checksums. */
1226         PF_ACPY(ia, na, af);
1227         switch (af) {
1228 #ifdef INET
1229         case AF_INET: {
1230                 u_int32_t        oh2c = *h2c;
1231
1232                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1233                     oia.addr16[0], ia->addr16[0], 0),
1234                     oia.addr16[1], ia->addr16[1], 0);
1235                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1236                     oia.addr16[0], ia->addr16[0], 0),
1237                     oia.addr16[1], ia->addr16[1], 0);
1238                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1239                 break;
1240         }
1241 #endif /* INET */
1242 #ifdef INET6
1243         case AF_INET6:
1244                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1245                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1246                     pf_cksum_fixup(pf_cksum_fixup(*ic,
1247                     oia.addr16[0], ia->addr16[0], u),
1248                     oia.addr16[1], ia->addr16[1], u),
1249                     oia.addr16[2], ia->addr16[2], u),
1250                     oia.addr16[3], ia->addr16[3], u),
1251                     oia.addr16[4], ia->addr16[4], u),
1252                     oia.addr16[5], ia->addr16[5], u),
1253                     oia.addr16[6], ia->addr16[6], u),
1254                     oia.addr16[7], ia->addr16[7], u);
1255                 break;
1256 #endif /* INET6 */
1257         }
1258         /* Change outer ip address, fix outer ip or icmpv6 checksum. */
1259         PF_ACPY(oa, na, af);
1260         switch (af) {
1261 #ifdef INET
1262         case AF_INET:
1263                 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1264                     ooa.addr16[0], oa->addr16[0], 0),
1265                     ooa.addr16[1], oa->addr16[1], 0);
1266                 break;
1267 #endif /* INET */
1268 #ifdef INET6
1269         case AF_INET6:
1270                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1271                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1272                     pf_cksum_fixup(pf_cksum_fixup(*ic,
1273                     ooa.addr16[0], oa->addr16[0], u),
1274                     ooa.addr16[1], oa->addr16[1], u),
1275                     ooa.addr16[2], oa->addr16[2], u),
1276                     ooa.addr16[3], oa->addr16[3], u),
1277                     ooa.addr16[4], oa->addr16[4], u),
1278                     ooa.addr16[5], oa->addr16[5], u),
1279                     ooa.addr16[6], oa->addr16[6], u),
1280                     ooa.addr16[7], oa->addr16[7], u);
1281                 break;
1282 #endif /* INET6 */
1283         }
1284 }
1285
1286 void
1287 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1288     const struct pf_addr *saddr, const struct pf_addr *daddr,
1289     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1290     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl)
1291 {
1292         struct mbuf     *m;
1293         int              len = 0, tlen;
1294 #ifdef INET
1295         struct ip       *h = NULL;
1296 #endif /* INET */
1297 #ifdef INET6
1298         struct ip6_hdr  *h6 = NULL;
1299 #endif /* INET6 */
1300         struct tcphdr   *th = NULL;
1301         char *opt;
1302
1303         /* maximum segment size tcp option */
1304         tlen = sizeof(struct tcphdr);
1305         if (mss)
1306                 tlen += 4;
1307
1308         switch (af) {
1309 #ifdef INET
1310         case AF_INET:
1311                 len = sizeof(struct ip) + tlen;
1312                 break;
1313 #endif /* INET */
1314 #ifdef INET6
1315         case AF_INET6:
1316                 len = sizeof(struct ip6_hdr) + tlen;
1317                 break;
1318 #endif /* INET6 */
1319         }
1320
1321         /* create outgoing mbuf */
1322         m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1323         if (m == NULL)
1324                 return;
1325         m->m_pkthdr.fw_flags = PF_MBUF_GENERATED;
1326 #ifdef ALTQ
1327         if (r != NULL && r->qid) {
1328                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
1329                 m->m_pkthdr.altq_qid = r->qid;
1330                 m->m_pkthdr.ecn_af = af;
1331                 m->m_pkthdr.header = mtod(m, struct ip *);
1332         }
1333 #endif
1334         m->m_data += max_linkhdr;
1335         m->m_pkthdr.len = m->m_len = len;
1336         m->m_pkthdr.rcvif = NULL;
1337         bzero(m->m_data, len);
1338         switch (af) {
1339 #ifdef INET
1340         case AF_INET:
1341                 h = mtod(m, struct ip *);
1342
1343                 /* IP header fields included in the TCP checksum */
1344                 h->ip_p = IPPROTO_TCP;
1345                 h->ip_len = tlen;
1346                 h->ip_src.s_addr = saddr->v4.s_addr;
1347                 h->ip_dst.s_addr = daddr->v4.s_addr;
1348
1349                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1350                 break;
1351 #endif /* INET */
1352 #ifdef INET6
1353         case AF_INET6:
1354                 h6 = mtod(m, struct ip6_hdr *);
1355
1356                 /* IP header fields included in the TCP checksum */
1357                 h6->ip6_nxt = IPPROTO_TCP;
1358                 h6->ip6_plen = htons(tlen);
1359                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1360                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1361
1362                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1363                 break;
1364 #endif /* INET6 */
1365         }
1366
1367         /* TCP header */
1368         th->th_sport = sport;
1369         th->th_dport = dport;
1370         th->th_seq = htonl(seq);
1371         th->th_ack = htonl(ack);
1372         th->th_off = tlen >> 2;
1373         th->th_flags = flags;
1374         th->th_win = htons(win);
1375
1376         if (mss) {
1377                 opt = (char *)(th + 1);
1378                 opt[0] = TCPOPT_MAXSEG;
1379                 opt[1] = 4;
1380                 mss = htons(mss);
1381                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1382         }
1383
1384         switch (af) {
1385 #ifdef INET
1386         case AF_INET:
1387                 /* TCP checksum */
1388                 th->th_sum = in_cksum(m, len);
1389
1390                 /* Finish the IP header */
1391                 h->ip_v = 4;
1392                 h->ip_hl = sizeof(*h) >> 2;
1393                 h->ip_tos = IPTOS_LOWDELAY;
1394                 h->ip_len = len;
1395                 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1396                 h->ip_ttl = ttl ? ttl : ip_defttl;
1397                 h->ip_sum = 0;
1398                 ip_output(m, NULL, NULL, 0, NULL, 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->hash = pf_state_hash(s);
2728                 s->src.seqlo = ntohl(th->th_seq);
2729                 s->src.seqhi = s->src.seqlo + len + 1;
2730                 s->pickup_mode = r->pickup_mode;
2731
2732                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2733                     r->keep_state == PF_STATE_MODULATE) {
2734                         /* Generate sequence number modulator */
2735                         while ((s->src.seqdiff = karc4random()) == 0)
2736                                 ;
2737                         pf_change_a(&th->th_seq, &th->th_sum,
2738                             htonl(s->src.seqlo + s->src.seqdiff), 0);
2739                         rewrite = 1;
2740                 } else
2741                         s->src.seqdiff = 0;
2742
2743                 /*
2744                  * WARNING!  NetBSD patched this to not scale max_win up
2745                  * on the initial SYN, but they failed to correct the code
2746                  * in pf_test_state_tcp() that 'undid' the scaling, and they
2747                  * failed to remove the scale factor on successful window
2748                  * scale negotiation (and doing so would be difficult in the
2749                  * face of retransmission, without adding more flags to the
2750                  * state structure).
2751                  *
2752                  * After discussions with Daniel Hartmeier and Max Laier
2753                  * I've decided not to apply the NetBSD patch.
2754                  *
2755                  * The worst that happens is that the undo code on window
2756                  * scale negotiation failures will produce a larger
2757                  * max_win then actual.
2758                  */
2759                 if (th->th_flags & TH_SYN) {
2760                         s->src.seqhi++;
2761                         s->src.wscale = pf_get_wscale(m, off, th->th_off, af);
2762                         s->sync_flags |= PFSTATE_GOT_SYN1;
2763                 }
2764                 s->src.max_win = MAX(ntohs(th->th_win), 1);
2765                 if (s->src.wscale & PF_WSCALE_MASK) {
2766                         /* Remove scale factor from initial window */
2767                         u_int win = s->src.max_win;
2768                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
2769                         s->src.max_win = (win - 1) >>
2770                             (s->src.wscale & PF_WSCALE_MASK);
2771                 }
2772                 if (th->th_flags & TH_FIN)
2773                         s->src.seqhi++;
2774                 s->dst.seqhi = 1;
2775                 s->dst.max_win = 1;
2776                 s->src.state = TCPS_SYN_SENT;
2777                 s->dst.state = TCPS_CLOSED;
2778                 s->creation = time_second;
2779                 s->expire = time_second;
2780                 s->timeout = PFTM_TCP_FIRST_PACKET;
2781                 pf_set_rt_ifp(s, saddr);
2782                 if (sn != NULL) {
2783                         s->src_node = sn;
2784                         s->src_node->states++;
2785                 }
2786                 if (nsn != NULL) {
2787                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
2788                         s->nat_src_node = nsn;
2789                         s->nat_src_node->states++;
2790                 }
2791                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
2792                     off, pd, th, &s->src, &s->dst)) {
2793                         REASON_SET(&reason, PFRES_MEMORY);
2794                         pf_src_tree_remove_state(s);
2795                         pool_put(&pf_state_pl, s);
2796                         return (PF_DROP);
2797                 }
2798                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
2799                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, &s->src,
2800                     &s->dst, &rewrite)) {
2801                         pf_normalize_tcp_cleanup(s);
2802                         pf_src_tree_remove_state(s);
2803                         pool_put(&pf_state_pl, s);
2804                         return (PF_DROP);
2805                 }
2806                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
2807                         pf_normalize_tcp_cleanup(s);
2808                         REASON_SET(&reason, PFRES_MEMORY);
2809                         pf_src_tree_remove_state(s);
2810                         pool_put(&pf_state_pl, s);
2811                         return (PF_DROP);
2812                 } else
2813                         *sm = s;
2814                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2815                     r->keep_state == PF_STATE_SYNPROXY) {
2816                         s->src.state = PF_TCPS_PROXY_SRC;
2817                         if (nr != NULL) {
2818                                 if (direction == PF_OUT) {
2819                                         pf_change_ap(saddr, &th->th_sport,
2820                                             pd->ip_sum, &th->th_sum, &pd->baddr,
2821                                             bport, 0, af);
2822                                 } else {
2823                                         pf_change_ap(daddr, &th->th_dport,
2824                                             pd->ip_sum, &th->th_sum, &pd->baddr,
2825                                             bport, 0, af);
2826                                 }
2827                         }
2828                         s->src.seqhi = karc4random();
2829                         /* Find mss option */
2830                         mss = pf_get_mss(m, off, th->th_off, af);
2831                         mss = pf_calc_mss(saddr, af, mss);
2832                         mss = pf_calc_mss(daddr, af, mss);
2833                         s->src.mss = mss;
2834                         pf_send_tcp(r, af, daddr, saddr, th->th_dport,
2835                             th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
2836                             TH_SYN|TH_ACK, 0, s->src.mss, 0);
2837                         return (PF_SYNPROXY_DROP);
2838                 }
2839         }
2840
2841         /* copy back packet headers if we performed NAT operations */
2842         if (rewrite)
2843                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
2844
2845         return (PF_PASS);
2846 }
2847
2848 int
2849 pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction,
2850     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2851     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
2852 {
2853         struct pf_rule          *nr = NULL;
2854         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
2855         struct udphdr           *uh = pd->hdr.udp;
2856         u_int16_t                bport, nport = 0;
2857         sa_family_t              af = pd->af;
2858         int                      lookup = -1;
2859         uid_t                    uid;
2860         gid_t                    gid;
2861         struct pf_rule          *r, *a = NULL;
2862         struct pf_ruleset       *ruleset = NULL;
2863         struct pf_src_node      *nsn = NULL;
2864         u_short                  reason;
2865         int                      rewrite = 0;
2866         int                      tag = -1;
2867
2868         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2869
2870         if (direction == PF_OUT) {
2871                 bport = nport = uh->uh_sport;
2872                 /* check outgoing packet for BINAT/NAT */
2873                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2874                     saddr, uh->uh_sport, daddr, uh->uh_dport,
2875                     &pd->naddr, &nport)) != NULL) {
2876                         PF_ACPY(&pd->baddr, saddr, af);
2877                         pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2878                             &uh->uh_sum, &pd->naddr, nport, 1, af);
2879                         rewrite++;
2880                         if (nr->natpass)
2881                                 r = NULL;
2882                         pd->nat_rule = nr;
2883                 }
2884         } else {
2885                 bport = nport = uh->uh_dport;
2886                 /* check incoming packet for BINAT/RDR */
2887                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
2888                     saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr,
2889                     &nport)) != NULL) {
2890                         PF_ACPY(&pd->baddr, daddr, af);
2891                         pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2892                             &uh->uh_sum, &pd->naddr, nport, 1, af);
2893                         rewrite++;
2894                         if (nr->natpass)
2895                                 r = NULL;
2896                         pd->nat_rule = nr;
2897                 }
2898         }
2899
2900         while (r != NULL) {
2901                 r->evaluations++;
2902                 if (r->kif != NULL &&
2903                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
2904                         r = r->skip[PF_SKIP_IFP].ptr;
2905                 else if (r->direction && r->direction != direction)
2906                         r = r->skip[PF_SKIP_DIR].ptr;
2907                 else if (r->af && r->af != af)
2908                         r = r->skip[PF_SKIP_AF].ptr;
2909                 else if (r->proto && r->proto != IPPROTO_UDP)
2910                         r = r->skip[PF_SKIP_PROTO].ptr;
2911                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
2912                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
2913                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
2914                     r->src.port[0], r->src.port[1], uh->uh_sport))
2915                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
2916                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
2917                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2918                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
2919                     r->dst.port[0], r->dst.port[1], uh->uh_dport))
2920                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2921                 else if (r->tos && !(r->tos & pd->tos))
2922                         r = TAILQ_NEXT(r, entries);
2923                 else if (r->rule_flag & PFRULE_FRAGMENT)
2924                         r = TAILQ_NEXT(r, entries);
2925                 else if (r->uid.op && (lookup != -1 || (lookup =
2926                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2927                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
2928                     uid))
2929                         r = TAILQ_NEXT(r, entries);
2930                 else if (r->gid.op && (lookup != -1 || (lookup =
2931                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2932                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
2933                     gid))
2934                         r = TAILQ_NEXT(r, entries);
2935                 else if (r->prob && r->prob <= karc4random())
2936                         r = TAILQ_NEXT(r, entries);
2937                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
2938                         r = TAILQ_NEXT(r, entries);
2939                 else if (r->anchorname[0] && r->anchor == NULL)
2940                         r = TAILQ_NEXT(r, entries);
2941                 else if (r->os_fingerprint != PF_OSFP_ANY)
2942                         r = TAILQ_NEXT(r, entries);
2943                 else {
2944                         if (r->tag)
2945                                 tag = r->tag;
2946                         if (r->anchor == NULL) {
2947                                 *rm = r;
2948                                 *am = a;
2949                                 *rsm = ruleset;
2950                                 if ((*rm)->quick)
2951                                         break;
2952                                 r = TAILQ_NEXT(r, entries);
2953                         } else
2954                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
2955                                     PF_RULESET_FILTER);
2956                 }
2957                 if (r == NULL && a != NULL)
2958                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
2959                             PF_RULESET_FILTER);
2960         }
2961         r = *rm;
2962         a = *am;
2963         ruleset = *rsm;
2964
2965         REASON_SET(&reason, PFRES_MATCH);
2966
2967         if (r->log) {
2968                 if (rewrite)
2969                         m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
2970                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
2971         }
2972
2973         if ((r->action == PF_DROP) &&
2974             ((r->rule_flag & PFRULE_RETURNICMP) ||
2975             (r->rule_flag & PFRULE_RETURN))) {
2976                 /* undo NAT changes, if they have taken place */
2977                 if (nr != NULL) {
2978                         if (direction == PF_OUT) {
2979                                 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2980                                     &uh->uh_sum, &pd->baddr, bport, 1, af);
2981                                 rewrite++;
2982                         } else {
2983                                 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2984                                     &uh->uh_sum, &pd->baddr, bport, 1, af);
2985                                 rewrite++;
2986                         }
2987                 }
2988                 if ((af == AF_INET) && r->return_icmp)
2989                         pf_send_icmp(m, r->return_icmp >> 8,
2990                             r->return_icmp & 255, af, r);
2991                 else if ((af == AF_INET6) && r->return_icmp6)
2992                         pf_send_icmp(m, r->return_icmp6 >> 8,
2993                             r->return_icmp6 & 255, af, r);
2994         }
2995
2996         if (r->action == PF_DROP)
2997                 return (PF_DROP);
2998
2999         pf_tag_packet(m, tag);
3000
3001         if (r->keep_state || nr != NULL) {
3002                 /* create new state */
3003                 struct pf_state *s = NULL;
3004                 struct pf_src_node *sn = NULL;
3005
3006                 /* check maximums */
3007                 if (r->max_states && (r->states >= r->max_states))
3008                         goto cleanup;
3009                 /* src node for flter rule */
3010                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3011                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3012                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3013                         goto cleanup;
3014                 /* src node for translation rule */
3015                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3016                     ((direction == PF_OUT &&
3017                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3018                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3019                         goto cleanup;
3020                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3021                 if (s == NULL) {
3022 cleanup:
3023                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3024                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3025                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3026                                 pf_status.src_nodes--;
3027                                 pool_put(&pf_src_tree_pl, sn);
3028                         }
3029                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3030                             nsn->expire == 0) {
3031                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3032                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3033                                 pf_status.src_nodes--;
3034                                 pool_put(&pf_src_tree_pl, nsn);
3035                         }
3036                         REASON_SET(&reason, PFRES_MEMORY);
3037                         return (PF_DROP);
3038                 }
3039                 bzero(s, sizeof(*s));
3040                 r->states++;
3041                 if (a != NULL)
3042                         a->states++;
3043                 s->rule.ptr = r;
3044                 s->nat_rule.ptr = nr;
3045                 if (s->nat_rule.ptr != NULL)
3046                         s->nat_rule.ptr->states++;
3047                 s->anchor.ptr = a;
3048                 s->allow_opts = r->allow_opts;
3049                 s->log = r->log & 2;
3050                 s->proto = IPPROTO_UDP;
3051                 s->direction = direction;
3052                 s->af = af;
3053                 if (direction == PF_OUT) {
3054                         PF_ACPY(&s->gwy.addr, saddr, af);
3055                         s->gwy.port = uh->uh_sport;
3056                         PF_ACPY(&s->ext.addr, daddr, af);
3057                         s->ext.port = uh->uh_dport;
3058                         if (nr != NULL) {
3059                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3060                                 s->lan.port = bport;
3061                         } else {
3062                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3063                                 s->lan.port = s->gwy.port;
3064                         }
3065                 } else {
3066                         PF_ACPY(&s->lan.addr, daddr, af);
3067                         s->lan.port = uh->uh_dport;
3068                         PF_ACPY(&s->ext.addr, saddr, af);
3069                         s->ext.port = uh->uh_sport;
3070                         if (nr != NULL) {
3071                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3072                                 s->gwy.port = bport;
3073                         } else {
3074                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3075                                 s->gwy.port = s->lan.port;
3076                         }
3077                 }
3078                 s->hash = pf_state_hash(s);
3079                 s->src.state = PFUDPS_SINGLE;
3080                 s->dst.state = PFUDPS_NO_TRAFFIC;
3081                 s->creation = time_second;
3082                 s->expire = time_second;
3083                 s->timeout = PFTM_UDP_FIRST_PACKET;
3084                 pf_set_rt_ifp(s, saddr);
3085                 if (sn != NULL) {
3086                         s->src_node = sn;
3087                         s->src_node->states++;
3088                 }
3089                 if (nsn != NULL) {
3090                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3091                         s->nat_src_node = nsn;
3092                         s->nat_src_node->states++;
3093                 }
3094                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3095                         REASON_SET(&reason, PFRES_MEMORY);
3096                         pf_src_tree_remove_state(s);
3097                         pool_put(&pf_state_pl, s);
3098                         return (PF_DROP);
3099                 } else
3100                         *sm = s;
3101         }
3102
3103         /* copy back packet headers if we performed NAT operations */
3104         if (rewrite)
3105                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
3106
3107         return (PF_PASS);
3108 }
3109
3110 int
3111 pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction,
3112     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3113     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
3114 {
3115         struct pf_rule          *nr = NULL;
3116         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3117         struct pf_rule          *r, *a = NULL;
3118         struct pf_ruleset       *ruleset = NULL;
3119         struct pf_src_node      *nsn = NULL;
3120         u_short                  reason;
3121         u_int16_t                icmpid = 0;
3122         sa_family_t              af = pd->af;
3123         u_int8_t                 icmptype = 0, icmpcode = 0;
3124         int                      state_icmp = 0;
3125         int                      tag = -1;
3126 #ifdef INET6
3127         int                      rewrite = 0;
3128 #endif /* INET6 */
3129
3130         switch (pd->proto) {
3131 #ifdef INET
3132         case IPPROTO_ICMP:
3133                 icmptype = pd->hdr.icmp->icmp_type;
3134                 icmpcode = pd->hdr.icmp->icmp_code;
3135                 icmpid = pd->hdr.icmp->icmp_id;
3136
3137                 if (icmptype == ICMP_UNREACH ||
3138                     icmptype == ICMP_SOURCEQUENCH ||
3139                     icmptype == ICMP_REDIRECT ||
3140                     icmptype == ICMP_TIMXCEED ||
3141                     icmptype == ICMP_PARAMPROB)
3142                         state_icmp++;
3143                 break;
3144 #endif /* INET */
3145 #ifdef INET6
3146         case IPPROTO_ICMPV6:
3147                 icmptype = pd->hdr.icmp6->icmp6_type;
3148                 icmpcode = pd->hdr.icmp6->icmp6_code;
3149                 icmpid = pd->hdr.icmp6->icmp6_id;
3150
3151                 if (icmptype == ICMP6_DST_UNREACH ||
3152                     icmptype == ICMP6_PACKET_TOO_BIG ||
3153                     icmptype == ICMP6_TIME_EXCEEDED ||
3154                     icmptype == ICMP6_PARAM_PROB)
3155                         state_icmp++;
3156                 break;
3157 #endif /* INET6 */
3158         }
3159
3160         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3161
3162         if (direction == PF_OUT) {
3163                 /* check outgoing packet for BINAT/NAT */
3164                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3165                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3166                         PF_ACPY(&pd->baddr, saddr, af);
3167                         switch (af) {
3168 #ifdef INET
3169                         case AF_INET:
3170                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3171                                     pd->naddr.v4.s_addr, 0);
3172                                 break;
3173 #endif /* INET */
3174 #ifdef INET6
3175                         case AF_INET6:
3176                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3177                                     &pd->naddr, 0);
3178                                 rewrite++;
3179                                 break;
3180 #endif /* INET6 */
3181                         }
3182                         if (nr->natpass)
3183                                 r = NULL;
3184                         pd->nat_rule = nr;
3185                 }
3186         } else {
3187                 /* check incoming packet for BINAT/RDR */
3188                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3189                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3190                         PF_ACPY(&pd->baddr, daddr, af);
3191                         switch (af) {
3192 #ifdef INET
3193                         case AF_INET:
3194                                 pf_change_a(&daddr->v4.s_addr,
3195                                     pd->ip_sum, pd->naddr.v4.s_addr, 0);
3196                                 break;
3197 #endif /* INET */
3198 #ifdef INET6
3199                         case AF_INET6:
3200                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3201                                     &pd->naddr, 0);
3202                                 rewrite++;
3203                                 break;
3204 #endif /* INET6 */
3205                         }
3206                         if (nr->natpass)
3207                                 r = NULL;
3208                         pd->nat_rule = nr;
3209                 }
3210         }
3211
3212         while (r != NULL) {
3213                 r->evaluations++;
3214                 if (r->kif != NULL &&
3215                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3216                         r = r->skip[PF_SKIP_IFP].ptr;
3217                 else if (r->direction && r->direction != direction)
3218                         r = r->skip[PF_SKIP_DIR].ptr;
3219                 else if (r->af && r->af != af)
3220                         r = r->skip[PF_SKIP_AF].ptr;
3221                 else if (r->proto && r->proto != pd->proto)
3222                         r = r->skip[PF_SKIP_PROTO].ptr;
3223                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
3224                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3225                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
3226                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3227                 else if (r->type && r->type != icmptype + 1)
3228                         r = TAILQ_NEXT(r, entries);
3229                 else if (r->code && r->code != icmpcode + 1)
3230                         r = TAILQ_NEXT(r, entries);
3231                 else if (r->tos && !(r->tos & pd->tos))
3232                         r = TAILQ_NEXT(r, entries);
3233                 else if (r->rule_flag & PFRULE_FRAGMENT)
3234                         r = TAILQ_NEXT(r, entries);
3235                 else if (r->prob && r->prob <= karc4random())
3236                         r = TAILQ_NEXT(r, entries);
3237                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3238                         r = TAILQ_NEXT(r, entries);
3239                 else if (r->anchorname[0] && r->anchor == NULL)
3240                         r = TAILQ_NEXT(r, entries);
3241                 else if (r->os_fingerprint != PF_OSFP_ANY)
3242                         r = TAILQ_NEXT(r, entries);
3243                 else {
3244                         if (r->tag)
3245                                 tag = r->tag;
3246                         if (r->anchor == NULL) {
3247                                 *rm = r;
3248                                 *am = a;
3249                                 *rsm = ruleset;
3250                                 if ((*rm)->quick)
3251                                         break;
3252                                 r = TAILQ_NEXT(r, entries);
3253                         } else
3254                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3255                                     PF_RULESET_FILTER);
3256                 }
3257                 if (r == NULL && a != NULL)
3258                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3259                             PF_RULESET_FILTER);
3260         }
3261         r = *rm;
3262         a = *am;
3263         ruleset = *rsm;
3264
3265         REASON_SET(&reason, PFRES_MATCH);
3266
3267         if (r->log) {
3268 #ifdef INET6
3269                 if (rewrite)
3270                         m_copyback(m, off, sizeof(struct icmp6_hdr),
3271                             (caddr_t)pd->hdr.icmp6);
3272 #endif /* INET6 */
3273                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3274         }
3275
3276         if (r->action != PF_PASS)
3277                 return (PF_DROP);
3278
3279         pf_tag_packet(m, tag);
3280
3281         if (!state_icmp && (r->keep_state || nr != NULL)) {
3282                 /* create new state */
3283                 struct pf_state *s = NULL;
3284                 struct pf_src_node *sn = NULL;
3285
3286                 /* check maximums */
3287                 if (r->max_states && (r->states >= r->max_states))
3288                         goto cleanup;
3289                 /* src node for flter rule */
3290                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3291                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3292                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3293                         goto cleanup;
3294                 /* src node for translation rule */
3295                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3296                     ((direction == PF_OUT &&
3297                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3298                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3299                         goto cleanup;
3300                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3301                 if (s == NULL) {
3302 cleanup:
3303                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3304                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3305                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3306                                 pf_status.src_nodes--;
3307                                 pool_put(&pf_src_tree_pl, sn);
3308                         }
3309                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3310                             nsn->expire == 0) {
3311                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3312                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3313                                 pf_status.src_nodes--;
3314                                 pool_put(&pf_src_tree_pl, nsn);
3315                         }
3316                         REASON_SET(&reason, PFRES_MEMORY);
3317                         return (PF_DROP);
3318                 }
3319                 bzero(s, sizeof(*s));
3320                 r->states++;
3321                 if (a != NULL)
3322                         a->states++;
3323                 s->rule.ptr = r;
3324                 s->nat_rule.ptr = nr;
3325                 if (s->nat_rule.ptr != NULL)
3326                         s->nat_rule.ptr->states++;
3327                 s->anchor.ptr = a;
3328                 s->allow_opts = r->allow_opts;
3329                 s->log = r->log & 2;
3330                 s->proto = pd->proto;
3331                 s->direction = direction;
3332                 s->af = af;
3333                 if (direction == PF_OUT) {
3334                         PF_ACPY(&s->gwy.addr, saddr, af);
3335                         s->gwy.port = icmpid;
3336                         PF_ACPY(&s->ext.addr, daddr, af);
3337                         s->ext.port = icmpid;
3338                         if (nr != NULL)
3339                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3340                         else
3341                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3342                         s->lan.port = icmpid;
3343                 } else {
3344                         PF_ACPY(&s->lan.addr, daddr, af);
3345                         s->lan.port = icmpid;
3346                         PF_ACPY(&s->ext.addr, saddr, af);
3347                         s->ext.port = icmpid;
3348                         if (nr != NULL)
3349                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3350                         else
3351                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3352                         s->gwy.port = icmpid;
3353                 }
3354                 s->hash = pf_state_hash(s);
3355                 s->creation = time_second;
3356                 s->expire = time_second;
3357                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3358                 pf_set_rt_ifp(s, saddr);
3359                 if (sn != NULL) {
3360                         s->src_node = sn;
3361                         s->src_node->states++;
3362                 }
3363                 if (nsn != NULL) {
3364                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3365                         s->nat_src_node = nsn;
3366                         s->nat_src_node->states++;
3367                 }
3368                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3369                         REASON_SET(&reason, PFRES_MEMORY);
3370                         pf_src_tree_remove_state(s);
3371                         pool_put(&pf_state_pl, s);
3372                         return (PF_DROP);
3373                 } else
3374                         *sm = s;
3375         }
3376
3377 #ifdef INET6
3378         /* copy back packet headers if we performed IPv6 NAT operations */
3379         if (rewrite)
3380                 m_copyback(m, off, sizeof(struct icmp6_hdr),
3381                     (caddr_t)pd->hdr.icmp6);
3382 #endif /* INET6 */
3383
3384         return (PF_PASS);
3385 }
3386
3387 int
3388 pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction,
3389     struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3390     struct pf_rule **am, struct pf_ruleset **rsm)
3391 {
3392         struct pf_rule          *nr = NULL;
3393         struct pf_rule          *r, *a = NULL;
3394         struct pf_ruleset       *ruleset = NULL;
3395         struct pf_src_node      *nsn = NULL;
3396         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3397         sa_family_t              af = pd->af;
3398         u_short                  reason;
3399         int                      tag = -1;
3400
3401         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3402
3403         if (direction == PF_OUT) {
3404                 /* check outgoing packet for BINAT/NAT */
3405                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3406                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3407                         PF_ACPY(&pd->baddr, saddr, af);
3408                         switch (af) {
3409 #ifdef INET
3410                         case AF_INET:
3411                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3412                                     pd->naddr.v4.s_addr, 0);
3413                                 break;
3414 #endif /* INET */
3415 #ifdef INET6
3416                         case AF_INET6:
3417                                 PF_ACPY(saddr, &pd->naddr, af);
3418                                 break;
3419 #endif /* INET6 */
3420                         }
3421                         if (nr->natpass)
3422                                 r = NULL;
3423                         pd->nat_rule = nr;
3424                 }
3425         } else {
3426                 /* check incoming packet for BINAT/RDR */
3427                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3428                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3429                         PF_ACPY(&pd->baddr, daddr, af);
3430                         switch (af) {
3431 #ifdef INET
3432                         case AF_INET:
3433                                 pf_change_a(&daddr->v4.s_addr,
3434                                     pd->ip_sum, pd->naddr.v4.s_addr, 0);
3435                                 break;
3436 #endif /* INET */
3437 #ifdef INET6
3438                         case AF_INET6:
3439                                 PF_ACPY(daddr, &pd->naddr, af);
3440                                 break;
3441 #endif /* INET6 */
3442                         }
3443                         if (nr->natpass)
3444                                 r = NULL;
3445                         pd->nat_rule = nr;
3446                 }
3447         }
3448
3449         while (r != NULL) {
3450                 r->evaluations++;
3451                 if (r->kif != NULL &&
3452                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3453                         r = r->skip[PF_SKIP_IFP].ptr;
3454                 else if (r->direction && r->direction != direction)
3455                         r = r->skip[PF_SKIP_DIR].ptr;
3456                 else if (r->af && r->af != af)
3457                         r = r->skip[PF_SKIP_AF].ptr;
3458                 else if (r->proto && r->proto != pd->proto)
3459                         r = r->skip[PF_SKIP_PROTO].ptr;
3460                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3461                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3462                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3463                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3464                 else if (r->tos && !(r->tos & pd->tos))
3465                         r = TAILQ_NEXT(r, entries);
3466                 else if (r->rule_flag & PFRULE_FRAGMENT)
3467                         r = TAILQ_NEXT(r, entries);
3468                 else if (r->prob && r->prob <= karc4random())
3469                         r = TAILQ_NEXT(r, entries);
3470                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3471                         r = TAILQ_NEXT(r, entries);
3472                 else if (r->anchorname[0] && r->anchor == NULL)
3473                         r = TAILQ_NEXT(r, entries);
3474                 else if (r->os_fingerprint != PF_OSFP_ANY)
3475                         r = TAILQ_NEXT(r, entries);
3476                 else {
3477                         if (r->tag)
3478                                 tag = r->tag;
3479                         if (r->anchor == NULL) {
3480                                 *rm = r;
3481                                 *am = a;
3482                                 *rsm = ruleset;
3483                                 if ((*rm)->quick)
3484                                         break;
3485                                 r = TAILQ_NEXT(r, entries);
3486                         } else
3487                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3488                                     PF_RULESET_FILTER);
3489                 }
3490                 if (r == NULL && a != NULL)
3491                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3492                             PF_RULESET_FILTER);
3493         }
3494         r = *rm;
3495         a = *am;
3496         ruleset = *rsm;
3497
3498         REASON_SET(&reason, PFRES_MATCH);
3499
3500         if (r->log)
3501                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3502
3503         if ((r->action == PF_DROP) &&
3504             ((r->rule_flag & PFRULE_RETURNICMP) ||
3505             (r->rule_flag & PFRULE_RETURN))) {
3506                 struct pf_addr *a = NULL;
3507
3508                 if (nr != NULL) {
3509                         if (direction == PF_OUT)
3510                                 a = saddr;
3511                         else
3512                                 a = daddr;
3513                 }
3514                 if (a != NULL) {
3515                         switch (af) {
3516 #ifdef INET
3517                         case AF_INET:
3518                                 pf_change_a(&a->v4.s_addr, pd->ip_sum,
3519                                     pd->baddr.v4.s_addr, 0);
3520                                 break;
3521 #endif /* INET */
3522 #ifdef INET6
3523                         case AF_INET6:
3524                                 PF_ACPY(a, &pd->baddr, af);
3525                                 break;
3526 #endif /* INET6 */
3527                         }
3528                 }
3529                 if ((af == AF_INET) && r->return_icmp)
3530                         pf_send_icmp(m, r->return_icmp >> 8,
3531                             r->return_icmp & 255, af, r);
3532                 else if ((af == AF_INET6) && r->return_icmp6)
3533                         pf_send_icmp(m, r->return_icmp6 >> 8,
3534                             r->return_icmp6 & 255, af, r);
3535         }
3536
3537         if (r->action != PF_PASS)
3538                 return (PF_DROP);
3539
3540         pf_tag_packet(m, tag);
3541
3542         if (r->keep_state || nr != NULL) {
3543                 /* create new state */
3544                 struct pf_state *s = NULL;
3545                 struct pf_src_node *sn = NULL;
3546
3547                 /* check maximums */
3548                 if (r->max_states && (r->states >= r->max_states))
3549                         goto cleanup;
3550                 /* src node for flter rule */
3551                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3552                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3553                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3554                         goto cleanup;
3555                 /* src node for translation rule */
3556                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3557                     ((direction == PF_OUT &&
3558                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3559                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3560                         goto cleanup;
3561                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3562                 if (s == NULL) {
3563 cleanup:
3564                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3565                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3566                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3567                                 pf_status.src_nodes--;
3568                                 pool_put(&pf_src_tree_pl, sn);
3569                         }
3570                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3571                             nsn->expire == 0) {
3572                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3573                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3574                                 pf_status.src_nodes--;
3575                                 pool_put(&pf_src_tree_pl, nsn);
3576                         }
3577                         REASON_SET(&reason, PFRES_MEMORY);
3578                         return (PF_DROP);
3579                 }
3580                 bzero(s, sizeof(*s));
3581                 r->states++;
3582                 if (a != NULL)
3583                         a->states++;
3584                 s->rule.ptr = r;
3585                 s->nat_rule.ptr = nr;
3586                 if (s->nat_rule.ptr != NULL)
3587                         s->nat_rule.ptr->states++;
3588                 s->anchor.ptr = a;
3589                 s->allow_opts = r->allow_opts;
3590                 s->log = r->log & 2;
3591                 s->proto = pd->proto;
3592                 s->direction = direction;
3593                 s->af = af;
3594                 if (direction == PF_OUT) {
3595                         PF_ACPY(&s->gwy.addr, saddr, af);
3596                         PF_ACPY(&s->ext.addr, daddr, af);
3597                         if (nr != NULL)
3598                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3599                         else
3600                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3601                 } else {
3602                         PF_ACPY(&s->lan.addr, daddr, af);
3603                         PF_ACPY(&s->ext.addr, saddr, af);
3604                         if (nr != NULL)
3605                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3606                         else
3607                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3608                 }
3609                 s->hash = pf_state_hash(s);
3610                 s->src.state = PFOTHERS_SINGLE;
3611                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3612                 s->creation = time_second;
3613                 s->expire = time_second;
3614                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3615                 pf_set_rt_ifp(s, saddr);
3616                 if (sn != NULL) {
3617                         s->src_node = sn;
3618                         s->src_node->states++;
3619                 }
3620                 if (nsn != NULL) {
3621                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3622                         s->nat_src_node = nsn;
3623                         s->nat_src_node->states++;
3624                 }
3625                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3626                         REASON_SET(&reason, PFRES_MEMORY);
3627                         pf_src_tree_remove_state(s);
3628                         pool_put(&pf_state_pl, s);
3629                         return (PF_DROP);
3630                 } else
3631                         *sm = s;
3632         }
3633
3634         return (PF_PASS);
3635 }
3636
3637 int
3638 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3639     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3640     struct pf_ruleset **rsm)
3641 {
3642         struct pf_rule          *r, *a = NULL;
3643         struct pf_ruleset       *ruleset = NULL;
3644         sa_family_t              af = pd->af;
3645         u_short                  reason;
3646         int                      tag = -1;
3647
3648         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3649         while (r != NULL) {
3650                 r->evaluations++;
3651                 if (r->kif != NULL &&
3652                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3653                         r = r->skip[PF_SKIP_IFP].ptr;
3654                 else if (r->direction && r->direction != direction)
3655                         r = r->skip[PF_SKIP_DIR].ptr;
3656                 else if (r->af && r->af != af)
3657                         r = r->skip[PF_SKIP_AF].ptr;
3658                 else if (r->proto && r->proto != pd->proto)
3659                         r = r->skip[PF_SKIP_PROTO].ptr;
3660                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3661                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3662                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3663                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3664                 else if (r->tos && !(r->tos & pd->tos))
3665                         r = TAILQ_NEXT(r, entries);
3666                 else if (r->os_fingerprint != PF_OSFP_ANY)
3667                         r = TAILQ_NEXT(r, entries);
3668                 else if (pd->proto == IPPROTO_UDP &&
3669                     (r->src.port_op || r->dst.port_op))
3670                         r = TAILQ_NEXT(r, entries);
3671                 else if (pd->proto == IPPROTO_TCP &&
3672                     (r->src.port_op || r->dst.port_op || r->flagset))
3673                         r = TAILQ_NEXT(r, entries);
3674                 else if ((pd->proto == IPPROTO_ICMP ||
3675                     pd->proto == IPPROTO_ICMPV6) &&
3676                     (r->type || r->code))
3677                         r = TAILQ_NEXT(r, entries);
3678                 else if (r->prob && r->prob <= karc4random())
3679                         r = TAILQ_NEXT(r, entries);
3680                 else if (r->match_tag && !pf_match_tag(m, r, NULL, &tag))
3681                         r = TAILQ_NEXT(r, entries);
3682                 else if (r->anchorname[0] && r->anchor == NULL)
3683                         r = TAILQ_NEXT(r, entries);
3684                 else {
3685                         if (r->anchor == NULL) {
3686                                 *rm = r;
3687                                 *am = a;
3688                                 *rsm = ruleset;
3689                                 if ((*rm)->quick)
3690                                         break;
3691                                 r = TAILQ_NEXT(r, entries);
3692                         } else
3693                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3694                                     PF_RULESET_FILTER);
3695                 }
3696                 if (r == NULL && a != NULL)
3697                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3698                             PF_RULESET_FILTER);
3699         }
3700         r = *rm;
3701         a = *am;
3702         ruleset = *rsm;
3703
3704         REASON_SET(&reason, PFRES_MATCH);
3705
3706         if (r->log)
3707                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3708
3709         if (r->action != PF_PASS)
3710                 return (PF_DROP);
3711
3712         pf_tag_packet(m, tag);
3713
3714         return (PF_PASS);
3715 }
3716
3717 int
3718 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
3719     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3720     u_short *reason)
3721 {
3722         struct pf_state          key;
3723         struct tcphdr           *th = pd->hdr.tcp;
3724         u_int16_t                win = ntohs(th->th_win);
3725         u_int32_t                ack, end, seq;
3726         u_int8_t                 sws, dws;
3727         int                      ackskew;
3728         int                      copyback = 0;
3729         struct pf_state_peer    *src, *dst;
3730
3731         key.af = pd->af;
3732         key.proto = IPPROTO_TCP;
3733         if (direction == PF_IN) {
3734                 PF_ACPY(&key.ext.addr, pd->src, key.af);
3735                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
3736                 key.ext.port = th->th_sport;
3737                 key.gwy.port = th->th_dport;
3738         } else {
3739                 PF_ACPY(&key.lan.addr, pd->src, key.af);
3740                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
3741                 key.lan.port = th->th_sport;
3742                 key.ext.port = th->th_dport;
3743         }
3744
3745         STATE_LOOKUP();
3746
3747         if (direction == (*state)->direction) {
3748                 src = &(*state)->src;
3749                 dst = &(*state)->dst;
3750         } else {
3751                 src = &(*state)->dst;
3752                 dst = &(*state)->src;
3753         }
3754
3755         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
3756                 if (direction != (*state)->direction)
3757                         return (PF_SYNPROXY_DROP);
3758                 if (th->th_flags & TH_SYN) {
3759                         if (ntohl(th->th_seq) != (*state)->src.seqlo)
3760                                 return (PF_DROP);
3761                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3762                             pd->src, th->th_dport, th->th_sport,
3763                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
3764                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0);
3765                         return (PF_SYNPROXY_DROP);
3766                 } else if (!(th->th_flags & TH_ACK) ||
3767                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3768                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3769                         return (PF_DROP);
3770                 else
3771                         (*state)->src.state = PF_TCPS_PROXY_DST;
3772         }
3773         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
3774                 struct pf_state_host *src, *dst;
3775
3776                 if (direction == PF_OUT) {
3777                         src = &(*state)->gwy;
3778                         dst = &(*state)->ext;
3779                 } else {
3780                         src = &(*state)->ext;
3781                         dst = &(*state)->lan;
3782                 }
3783                 if (direction == (*state)->direction) {
3784                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
3785                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3786                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3787                                 return (PF_DROP);
3788                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
3789                         if ((*state)->dst.seqhi == 1)
3790                                 (*state)->dst.seqhi = karc4random();
3791                         pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3792                             &dst->addr, src->port, dst->port,
3793                             (*state)->dst.seqhi, 0, TH_SYN, 0,
3794                             (*state)->src.mss, 0);
3795                         return (PF_SYNPROXY_DROP);
3796                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
3797                     (TH_SYN|TH_ACK)) ||
3798                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1))
3799                         return (PF_DROP);
3800                 else {
3801                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
3802                         (*state)->dst.seqlo = ntohl(th->th_seq);
3803                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3804                             pd->src, th->th_dport, th->th_sport,
3805                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
3806                             TH_ACK, (*state)->src.max_win, 0, 0);
3807                         pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3808                             &dst->addr, src->port, dst->port,
3809                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
3810                             TH_ACK, (*state)->dst.max_win, 0, 0);
3811                         (*state)->src.seqdiff = (*state)->dst.seqhi -
3812                             (*state)->src.seqlo;
3813                         (*state)->dst.seqdiff = (*state)->src.seqhi -
3814                             (*state)->dst.seqlo;
3815                         (*state)->src.seqhi = (*state)->src.seqlo +
3816                             (*state)->dst.max_win;
3817                         (*state)->dst.seqhi = (*state)->dst.seqlo +
3818                             (*state)->src.max_win;
3819                         (*state)->src.wscale = (*state)->dst.wscale = 0;
3820                         (*state)->src.state = (*state)->dst.state =
3821                             TCPS_ESTABLISHED;
3822                         return (PF_SYNPROXY_DROP);
3823                 }
3824         }
3825
3826         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3827                 sws = src->wscale & PF_WSCALE_MASK;
3828                 dws = dst->wscale & PF_WSCALE_MASK;
3829         } else
3830                 sws = dws = 0;
3831
3832         /*
3833          * Sequence tracking algorithm from Guido van Rooij's paper:
3834          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3835          *      tcp_filtering.ps
3836          */
3837
3838         seq = ntohl(th->th_seq);
3839         if (src->seqlo == 0) {
3840                 /*
3841                  * First packet from this end.  The other end has already set
3842                  * the seqlo field.  Set its state.
3843                  */
3844                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3845                     src->scrub == NULL) {
3846                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3847                                 REASON_SET(reason, PFRES_MEMORY);
3848                                 return (PF_DROP);
3849                         }
3850                 }
3851
3852                 /* Deferred generation of sequence number modulator */
3853                 if (dst->seqdiff && !src->seqdiff) {
3854                         while ((src->seqdiff = karc4random()) == 0)
3855                                 ;
3856                         ack = ntohl(th->th_ack) - dst->seqdiff;
3857                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3858                             src->seqdiff), 0);
3859                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3860                         copyback = 1;
3861                 } else {
3862                         ack = ntohl(th->th_ack);
3863                 }
3864
3865                 end = seq + pd->p_len;
3866                 if (th->th_flags & TH_SYN) {
3867                         end++;
3868                         (*state)->sync_flags |= PFSTATE_GOT_SYN2;
3869                         if (dst->wscale & PF_WSCALE_FLAG) {
3870                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3871                                     pd->af);
3872                                 if (src->wscale & PF_WSCALE_FLAG) {
3873                                         /* Remove scale factor from initial
3874                                          * window */
3875                                         sws = src->wscale & PF_WSCALE_MASK;
3876                                         win = ((u_int32_t)win + (1 << sws) - 1)
3877                                             >> sws;
3878                                         dws = dst->wscale & PF_WSCALE_MASK;
3879                                 } else {
3880                                         /*
3881                                          * Fixup other window.  Undo the
3882                                          * normalization that was done on
3883                                          * the initial SYN.  This can result
3884                                          * in max_win being larger then
3885                                          * actual but we don't really have
3886                                          * much of a choice.
3887                                          */
3888                                         dst->max_win <<= dst->wscale &
3889                                             PF_WSCALE_MASK;
3890                                         /* in case of a retrans SYN|ACK */
3891                                         dst->wscale = 0;
3892                                 }
3893                         }
3894                 }
3895                 if (th->th_flags & TH_FIN)
3896                         end++;
3897
3898                 src->seqlo = seq;
3899                 if (src->state < TCPS_SYN_SENT)
3900                         src->state = TCPS_SYN_SENT;
3901
3902                 /*
3903                  * May need to slide the window (seqhi may have been set by
3904                  * the crappy stack check or if we picked up the connection
3905                  * after establishment)
3906                  */
3907                 if (src->seqhi == 1 ||
3908                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3909                         src->seqhi = end + MAX(1, dst->max_win << dws);
3910                 if (win > src->max_win)
3911                         src->max_win = win;
3912
3913         } else {
3914                 ack = ntohl(th->th_ack) - dst->seqdiff;
3915                 if (src->seqdiff) {
3916                         /* Modulate sequence numbers */
3917                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3918                             src->seqdiff), 0);
3919                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3920                         copyback = 1;
3921                 }
3922                 end = seq + pd->p_len;
3923                 if (th->th_flags & TH_SYN)
3924                         end++;
3925                 if (th->th_flags & TH_FIN)
3926                         end++;
3927         }
3928
3929         if ((th->th_flags & TH_ACK) == 0) {
3930                 /* Let it pass through the ack skew check */
3931                 ack = dst->seqlo;
3932         } else if ((ack == 0 &&
3933             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3934             /* broken tcp stacks do not set ack */
3935             (dst->state < TCPS_SYN_SENT)) {
3936                 /*
3937                  * Many stacks (ours included) will set the ACK number in an
3938                  * FIN|ACK if the SYN times out -- no sequence to ACK.
3939                  */
3940                 ack = dst->seqlo;
3941         }
3942
3943         if (seq == end) {
3944                 /* Ease sequencing restrictions on no data packets */
3945                 seq = src->seqlo;
3946                 end = seq;
3947         }
3948
3949         ackskew = dst->seqlo - ack;
3950
3951 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
3952
3953         if (SEQ_GEQ(src->seqhi, end) &&
3954             /* Last octet inside other's window space */
3955             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
3956             /* Retrans: not more than one window back */
3957             (ackskew >= -MAXACKWINDOW) &&
3958             /* Acking not more than one reassembled fragment backwards */
3959             (ackskew <= (MAXACKWINDOW << sws))) {
3960             /* Acking not more than one window forward */
3961
3962                 /* update max window */
3963                 if (src->max_win < win)
3964                         src->max_win = win;
3965                 /* synchronize sequencing */
3966                 if (SEQ_GT(end, src->seqlo))
3967                         src->seqlo = end;
3968                 /* slide the window of what the other end can send */
3969                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
3970                         dst->seqhi = ack + MAX((win << sws), 1);
3971
3972
3973                 /* update states */
3974                 if (th->th_flags & TH_SYN)
3975                         if (src->state < TCPS_SYN_SENT)
3976                                 src->state = TCPS_SYN_SENT;
3977                 if (th->th_flags & TH_FIN)
3978                         if (src->state < TCPS_CLOSING)
3979                                 src->state = TCPS_CLOSING;
3980                 if (th->th_flags & TH_ACK) {
3981                         if (dst->state == TCPS_SYN_SENT)
3982                                 dst->state = TCPS_ESTABLISHED;
3983                         else if (dst->state == TCPS_CLOSING)
3984                                 dst->state = TCPS_FIN_WAIT_2;
3985                 }
3986                 if (th->th_flags & TH_RST)
3987                         src->state = dst->state = TCPS_TIME_WAIT;
3988
3989                 /* update expire time */
3990                 (*state)->expire = time_second;
3991                 if (src->state >= TCPS_FIN_WAIT_2 &&
3992                     dst->state >= TCPS_FIN_WAIT_2)
3993                         (*state)->timeout = PFTM_TCP_CLOSED;
3994                 else if (src->state >= TCPS_FIN_WAIT_2 ||
3995                     dst->state >= TCPS_FIN_WAIT_2)
3996                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
3997                 else if (src->state < TCPS_ESTABLISHED ||
3998                     dst->state < TCPS_ESTABLISHED)
3999                         (*state)->timeout = PFTM_TCP_OPENING;
4000                 else if (src->state >= TCPS_CLOSING ||
4001                     dst->state >= TCPS_CLOSING)
4002                         (*state)->timeout = PFTM_TCP_CLOSING;
4003                 else
4004                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4005
4006                 /* Fall through to PASS packet */
4007
4008         } else if ((dst->state < TCPS_SYN_SENT ||
4009                 dst->state >= TCPS_FIN_WAIT_2 ||
4010                 src->state >= TCPS_FIN_WAIT_2) &&
4011             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4012             /* Within a window forward of the originating packet */
4013             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4014             /* Within a window backward of the originating packet */
4015
4016                 /*
4017                  * This currently handles three situations:
4018                  *  1) Stupid stacks will shotgun SYNs before their peer
4019                  *     replies.
4020                  *  2) When PF catches an already established stream (the
4021                  *     firewall rebooted, the state table was flushed, routes
4022                  *     changed...)
4023                  *  3) Packets get funky immediately after the connection
4024                  *     closes (this should catch Solaris spurious ACK|FINs
4025                  *     that web servers like to spew after a close)
4026                  *
4027                  * This must be a little more careful than the above code
4028                  * since packet floods will also be caught here. We don't
4029                  * update the TTL here to mitigate the damage of a packet
4030                  * flood and so the same code can handle awkward establishment
4031                  * and a loosened connection close.
4032                  * In the establishment case, a correct peer response will
4033                  * validate the connection, go through the normal state code
4034                  * and keep updating the state TTL.
4035                  */
4036
4037                 if (pf_status.debug >= PF_DEBUG_MISC) {
4038                         kprintf("pf: loose state match: ");
4039                         pf_print_state(*state);
4040                         pf_print_flags(th->th_flags);
4041                         kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n",
4042                             seq, ack, pd->p_len, ackskew,
4043                             (*state)->packets[0], (*state)->packets[1]);
4044                 }
4045
4046                 /* update max window */
4047                 if (src->max_win < win)
4048                         src->max_win = win;
4049                 /* synchronize sequencing */
4050                 if (SEQ_GT(end, src->seqlo))
4051                         src->seqlo = end;
4052                 /* slide the window of what the other end can send */
4053                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4054                         dst->seqhi = ack + MAX((win << sws), 1);
4055
4056                 /*
4057                  * Cannot set dst->seqhi here since this could be a shotgunned
4058                  * SYN and not an already established connection.
4059                  */
4060
4061                 if (th->th_flags & TH_FIN)
4062                         if (src->state < TCPS_CLOSING)
4063                                 src->state = TCPS_CLOSING;
4064                 if (th->th_flags & TH_RST)
4065                         src->state = dst->state = TCPS_TIME_WAIT;
4066
4067                 /* Fall through to PASS packet */
4068
4069         } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY ||
4070                     ((*state)->pickup_mode == PF_PICKUPS_ENABLED &&
4071                      ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) !=
4072                       PFSTATE_GOT_SYN_MASK)) {
4073                 /*
4074                  * If pickup mode is hash only, do not fail on sequence checks.
4075                  *
4076                  * If pickup mode is enabled and we did not see the SYN in
4077                  * both direction, do not fail on sequence checks because
4078                  * we do not have complete information on window scale.
4079                  *
4080                  * Adjust expiration and fall through to PASS packet.
4081                  * XXX Add a FIN check to reduce timeout?
4082                  */
4083                 (*state)->expire = time_second;
4084         } else  {
4085                 /*
4086                  * Failure processing
4087                  */
4088                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4089                     (*state)->src.state == TCPS_SYN_SENT) {
4090                         /* Send RST for state mismatches during handshake */
4091                         if (!(th->th_flags & TH_RST)) {
4092                                 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
4093
4094                                 if (th->th_flags & TH_SYN)
4095                                         ack++;
4096                                 if (th->th_flags & TH_FIN)
4097                                         ack++;
4098                                 pf_send_tcp((*state)->rule.ptr, pd->af,
4099                                     pd->dst, pd->src, th->th_dport,
4100                                     th->th_sport, ntohl(th->th_ack), ack,
4101                                     TH_RST|TH_ACK, 0, 0,
4102                                     (*state)->rule.ptr->return_ttl);
4103                         }
4104                         src->seqlo = 0;
4105                         src->seqhi = 1;
4106                         src->max_win = 1;
4107                 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4108                         kprintf("pf: BAD state: ");
4109                         pf_print_state(*state);
4110                         pf_print_flags(th->th_flags);
4111                         kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d "
4112                             "dir=%s,%s\n", seq, ack, pd->p_len, ackskew,
4113                             (*state)->packets[0], (*state)->packets[1],
4114                             direction == PF_IN ? "in" : "out",
4115                             direction == (*state)->direction ? "fwd" : "rev");
4116                         kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4117                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4118                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4119                             ' ': '2',
4120                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4121                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4122                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4123                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4124                 }
4125                 return (PF_DROP);
4126         }
4127
4128         if (dst->scrub || src->scrub) {
4129                 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4130                     src, dst, &copyback))
4131                         return (PF_DROP);
4132         }
4133
4134         /* Any packets which have gotten here are to be passed */
4135
4136         /* translate source/destination address, if necessary */
4137         if (STATE_TRANSLATE(*state)) {
4138                 if (direction == PF_OUT)
4139                         pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4140                             &th->th_sum, &(*state)->gwy.addr,
4141                             (*state)->gwy.port, 0, pd->af);
4142                 else
4143                         pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4144                             &th->th_sum, &(*state)->lan.addr,
4145                             (*state)->lan.port, 0, pd->af);
4146                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4147         } else if (copyback) {
4148                 /* Copyback sequence modulation or stateful scrub changes */
4149                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4150         }
4151
4152         return (PF_PASS);
4153 }
4154
4155 int
4156 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4157     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4158 {
4159         struct pf_state_peer    *src, *dst;
4160         struct pf_state          key;
4161         struct udphdr           *uh = pd->hdr.udp;
4162
4163         key.af = pd->af;
4164         key.proto = IPPROTO_UDP;
4165         if (direction == PF_IN) {
4166                 PF_ACPY(&key.ext.addr, pd->src, key.af);
4167                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4168                 key.ext.port = uh->uh_sport;
4169                 key.gwy.port = uh->uh_dport;
4170         } else {
4171                 PF_ACPY(&key.lan.addr, pd->src, key.af);
4172                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4173                 key.lan.port = uh->uh_sport;
4174                 key.ext.port = uh->uh_dport;
4175         }
4176
4177         STATE_LOOKUP();
4178
4179         if (direction == (*state)->direction) {
4180                 src = &(*state)->src;
4181                 dst = &(*state)->dst;
4182         } else {
4183                 src = &(*state)->dst;
4184                 dst = &(*state)->src;
4185         }
4186
4187         /* update states */
4188         if (src->state < PFUDPS_SINGLE)
4189                 src->state = PFUDPS_SINGLE;
4190         if (dst->state == PFUDPS_SINGLE)
4191                 dst->state = PFUDPS_MULTIPLE;
4192
4193         /* update expire time */
4194         (*state)->expire = time_second;
4195         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4196                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4197         else
4198                 (*state)->timeout = PFTM_UDP_SINGLE;
4199
4200         /* translate source/destination address, if necessary */
4201         if (STATE_TRANSLATE(*state)) {
4202                 if (direction == PF_OUT)
4203                         pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4204                             &uh->uh_sum, &(*state)->gwy.addr,
4205                             (*state)->gwy.port, 1, pd->af);
4206                 else
4207                         pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4208                             &uh->uh_sum, &(*state)->lan.addr,
4209                             (*state)->lan.port, 1, pd->af);
4210                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4211         }
4212
4213         return (PF_PASS);
4214 }
4215
4216 int
4217 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4218     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4219 {
4220         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4221         u_int16_t        icmpid = 0;
4222         u_int16_t       *icmpsum = NULL;
4223         u_int8_t         icmptype = 0;
4224         int              state_icmp = 0;
4225
4226         switch (pd->proto) {
4227 #ifdef INET
4228         case IPPROTO_ICMP:
4229                 icmptype = pd->hdr.icmp->icmp_type;
4230                 icmpid = pd->hdr.icmp->icmp_id;
4231                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4232
4233                 if (icmptype == ICMP_UNREACH ||
4234                     icmptype == ICMP_SOURCEQUENCH ||
4235                     icmptype == ICMP_REDIRECT ||
4236                     icmptype == ICMP_TIMXCEED ||
4237                     icmptype == ICMP_PARAMPROB)
4238                         state_icmp++;
4239                 break;
4240 #endif /* INET */
4241 #ifdef INET6
4242         case IPPROTO_ICMPV6:
4243                 icmptype = pd->hdr.icmp6->icmp6_type;
4244                 icmpid = pd->hdr.icmp6->icmp6_id;
4245                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4246
4247                 if (icmptype == ICMP6_DST_UNREACH ||
4248                     icmptype == ICMP6_PACKET_TOO_BIG ||
4249                     icmptype == ICMP6_TIME_EXCEEDED ||
4250                     icmptype == ICMP6_PARAM_PROB)
4251                         state_icmp++;
4252                 break;
4253 #endif /* INET6 */
4254         }
4255
4256         if (!state_icmp) {
4257
4258                 /*
4259                  * ICMP query/reply message not related to a TCP/UDP packet.
4260                  * Search for an ICMP state.
4261                  */
4262                 struct pf_state         key;
4263
4264                 key.af = pd->af;
4265                 key.proto = pd->proto;
4266                 if (direction == PF_IN) {
4267                         PF_ACPY(&key.ext.addr, pd->src, key.af);
4268                         PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4269                         key.ext.port = icmpid;
4270                         key.gwy.port = icmpid;
4271                 } else {
4272                         PF_ACPY(&key.lan.addr, pd->src, key.af);
4273                         PF_ACPY(&key.ext.addr, pd->dst, key.af);
4274                         key.lan.port = icmpid;
4275                         key.ext.port = icmpid;
4276                 }
4277
4278                 STATE_LOOKUP();
4279
4280                 (*state)->expire = time_second;
4281                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4282
4283                 /* translate source/destination address, if necessary */
4284                 if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) {
4285                         if (direction == PF_OUT) {
4286                                 switch (pd->af) {
4287 #ifdef INET
4288                                 case AF_INET:
4289                                         pf_change_a(&saddr->v4.s_addr,
4290                                             pd->ip_sum,
4291                                             (*state)->gwy.addr.v4.s_addr, 0);
4292                                         break;
4293 #endif /* INET */
4294 #ifdef INET6
4295                                 case AF_INET6:
4296                                         pf_change_a6(saddr,
4297                                             &pd->hdr.icmp6->icmp6_cksum,
4298                                             &(*state)->gwy.addr, 0);
4299                                         m_copyback(m, off,
4300                                             sizeof(struct icmp6_hdr),
4301                                             (caddr_t)pd->hdr.icmp6);
4302                                         break;
4303 #endif /* INET6 */
4304                                 }
4305                         } else {
4306                                 switch (pd->af) {
4307 #ifdef INET
4308                                 case AF_INET:
4309                                         pf_change_a(&daddr->v4.s_addr,
4310                                             pd->ip_sum,
4311                                             (*state)->lan.addr.v4.s_addr, 0);
4312                                         break;
4313 #endif /* INET */
4314 #ifdef INET6
4315                                 case AF_INET6:
4316                                         pf_change_a6(daddr,
4317                                             &pd->hdr.icmp6->icmp6_cksum,
4318                                             &(*state)->lan.addr, 0);
4319                                         m_copyback(m, off,
4320                                             sizeof(struct icmp6_hdr),
4321                                             (caddr_t)pd->hdr.icmp6);
4322                                         break;
4323 #endif /* INET6 */
4324                                 }
4325                         }
4326                 }
4327
4328                 return (PF_PASS);
4329
4330         } else {
4331                 /*
4332                  * ICMP error message in response to a TCP/UDP packet.
4333                  * Extract the inner TCP/UDP header and search for that state.
4334                  */
4335
4336                 struct pf_pdesc pd2;
4337 #ifdef INET
4338                 struct ip       h2;
4339 #endif /* INET */
4340 #ifdef INET6
4341                 struct ip6_hdr  h2_6;
4342                 int             terminal = 0;
4343 #endif /* INET6 */
4344                 int             ipoff2 = 0;
4345                 int             off2 = 0;
4346
4347                 pd2.af = pd->af;
4348                 switch (pd->af) {
4349 #ifdef INET
4350                 case AF_INET:
4351                         /* offset of h2 in mbuf chain */
4352                         ipoff2 = off + ICMP_MINLEN;
4353
4354                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4355                             NULL, NULL, pd2.af)) {
4356                                 DPFPRINTF(PF_DEBUG_MISC,
4357                                     ("pf: ICMP error message too short "
4358                                     "(ip)\n"));
4359                                 return (PF_DROP);
4360                         }
4361                         /*
4362                          * ICMP error messages don't refer to non-first
4363                          * fragments
4364                          */
4365                         /*
4366                          * Note: We are dealing with an encapsulated
4367                          * header. This means ip_off/ip_len are not
4368                          * in host byte order!
4369                          */
4370                         if (h2.ip_off & htons(IP_OFFMASK))
4371                                 return (PF_DROP);
4372
4373                         /* offset of protocol header that follows h2 */
4374                         off2 = ipoff2 + (h2.ip_hl << 2);
4375
4376                         pd2.proto = h2.ip_p;
4377                         pd2.src = (struct pf_addr *)&h2.ip_src;
4378                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4379                         pd2.ip_sum = &h2.ip_sum;
4380                         break;
4381 #endif /* INET */
4382 #ifdef INET6
4383                 case AF_INET6:
4384                         ipoff2 = off + sizeof(struct icmp6_hdr);
4385
4386                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4387                             NULL, NULL, pd2.af)) {
4388                                 DPFPRINTF(PF_DEBUG_MISC,
4389                                     ("pf: ICMP error message too short "
4390                                     "(ip6)\n"));
4391                                 return (PF_DROP);
4392                         }
4393                         pd2.proto = h2_6.ip6_nxt;
4394                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4395                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4396                         pd2.ip_sum = NULL;
4397                         off2 = ipoff2 + sizeof(h2_6);
4398                         do {
4399                                 switch (pd2.proto) {
4400                                 case IPPROTO_FRAGMENT:
4401                                         /*
4402                                          * ICMPv6 error messages for
4403                                          * non-first fragments
4404                                          */
4405                                         return (PF_DROP);
4406                                 case IPPROTO_AH:
4407                                 case IPPROTO_HOPOPTS:
4408                                 case IPPROTO_ROUTING:
4409                                 case IPPROTO_DSTOPTS: {
4410                                         /* get next header and header length */
4411                                         struct ip6_ext opt6;
4412
4413                                         if (!pf_pull_hdr(m, off2, &opt6,
4414                                             sizeof(opt6), NULL, NULL, pd2.af)) {
4415                                                 DPFPRINTF(PF_DEBUG_MISC,
4416                                                     ("pf: ICMPv6 short opt\n"));
4417                                                 return (PF_DROP);
4418                                         }
4419                                         if (pd2.proto == IPPROTO_AH)
4420                                                 off2 += (opt6.ip6e_len + 2) * 4;
4421                                         else
4422                                                 off2 += (opt6.ip6e_len + 1) * 8;
4423                                         pd2.proto = opt6.ip6e_nxt;
4424                                         /* goto the next header */
4425                                         break;
4426                                 }
4427                                 default:
4428                                         terminal++;
4429                                         break;
4430                                 }
4431                         } while (!terminal);
4432                         break;
4433 #endif /* INET6 */
4434                 }
4435
4436                 switch (pd2.proto) {
4437                 case IPPROTO_TCP: {
4438                         struct tcphdr            th;
4439                         u_int32_t                seq;
4440                         struct pf_state          key;
4441                         struct pf_state_peer    *src, *dst;
4442                         u_int8_t                 dws;
4443                         int                      copyback = 0;
4444
4445                         /*
4446                          * Only the first 8 bytes of the TCP header can be
4447                          * expected. Don't access any TCP header fields after
4448                          * th_seq, an ackskew test is not possible.
4449                          */
4450                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, NULL, pd2.af)) {
4451                                 DPFPRINTF(PF_DEBUG_MISC,
4452                                     ("pf: ICMP error message too short "
4453                                     "(tcp)\n"));
4454                                 return (PF_DROP);
4455                         }
4456
4457                         key.af = pd2.af;
4458                         key.proto = IPPROTO_TCP;
4459                         if (direction == PF_IN) {
4460                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4461                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4462                                 key.ext.port = th.th_dport;
4463                                 key.gwy.port = th.th_sport;
4464                         } else {
4465                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4466                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4467                                 key.lan.port = th.th_dport;
4468                                 key.ext.port = th.th_sport;
4469                         }
4470
4471                         STATE_LOOKUP();
4472
4473                         if (direction == (*state)->direction) {
4474                                 src = &(*state)->dst;
4475                                 dst = &(*state)->src;
4476                         } else {
4477                                 src = &(*state)->src;
4478                                 dst = &(*state)->dst;
4479                         }
4480
4481                         if (src->wscale && dst->wscale &&
4482                             !(th.th_flags & TH_SYN))
4483                                 dws = dst->wscale & PF_WSCALE_MASK;
4484                         else
4485                                 dws = 0;
4486
4487                         /* Demodulate sequence number */
4488                         seq = ntohl(th.th_seq) - src->seqdiff;
4489                         if (src->seqdiff) {
4490                                 pf_change_a(&th.th_seq, icmpsum,
4491                                     htonl(seq), 0);
4492                                 copyback = 1;
4493                         }
4494
4495                         if (!SEQ_GEQ(src->seqhi, seq) ||
4496                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
4497                                 if (pf_status.debug >= PF_DEBUG_MISC) {
4498                                         kprintf("pf: BAD ICMP %d:%d ",
4499                                             icmptype, pd->hdr.icmp->icmp_code);
4500                                         pf_print_host(pd->src, 0, pd->af);
4501                                         kprintf(" -> ");
4502                                         pf_print_host(pd->dst, 0, pd->af);
4503                                         kprintf(" state: ");
4504                                         pf_print_state(*state);
4505                                         kprintf(" seq=%u\n", seq);
4506                                 }
4507                                 return (PF_DROP);
4508                         }
4509
4510                         if (STATE_TRANSLATE(*state)) {
4511                                 if (direction == PF_IN) {
4512                                         pf_change_icmp(pd2.src, &th.th_sport,
4513                                             daddr, &(*state)->lan.addr,
4514                                             (*state)->lan.port, NULL,
4515                                             pd2.ip_sum, icmpsum,
4516                                             pd->ip_sum, 0, pd2.af);
4517                                 } else {
4518                                         pf_change_icmp(pd2.dst, &th.th_dport,
4519                                             saddr, &(*state)->gwy.addr,
4520                                             (*state)->gwy.port, NULL,
4521                                             pd2.ip_sum, icmpsum,
4522                                             pd->ip_sum, 0, pd2.af);
4523                                 }
4524                                 copyback = 1;
4525                         }
4526
4527                         if (copyback) {
4528                                 switch (pd2.af) {
4529 #ifdef INET
4530                                 case AF_INET:
4531                                         m_copyback(m, off, ICMP_MINLEN,
4532                                             (caddr_t)pd->hdr.icmp);
4533                                         m_copyback(m, ipoff2, sizeof(h2),
4534                                             (caddr_t)&h2);
4535                                         break;
4536 #endif /* INET */
4537 #ifdef INET6
4538                                 case AF_INET6:
4539                                         m_copyback(m, off,
4540                                             sizeof(struct icmp6_hdr),
4541                                             (caddr_t)pd->hdr.icmp6);
4542                                         m_copyback(m, ipoff2, sizeof(h2_6),
4543                                             (caddr_t)&h2_6);
4544                                         break;
4545 #endif /* INET6 */
4546                                 }
4547                                 m_copyback(m, off2, 8, (caddr_t)&th);
4548                         }
4549
4550                         return (PF_PASS);
4551                         break;
4552                 }
4553                 case IPPROTO_UDP: {
4554                         struct udphdr           uh;
4555                         struct pf_state         key;
4556
4557                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4558                             NULL, NULL, pd2.af)) {
4559                                 DPFPRINTF(PF_DEBUG_MISC,
4560                                     ("pf: ICMP error message too short "
4561                                     "(udp)\n"));
4562                                 return (PF_DROP);
4563                         }
4564
4565                         key.af = pd2.af;
4566                         key.proto = IPPROTO_UDP;
4567                         if (direction == PF_IN) {
4568                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4569                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4570                                 key.ext.port = uh.uh_dport;
4571                                 key.gwy.port = uh.uh_sport;
4572                         } else {
4573                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4574                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4575                                 key.lan.port = uh.uh_dport;
4576                                 key.ext.port = uh.uh_sport;
4577                         }
4578
4579                         STATE_LOOKUP();
4580
4581                         if (STATE_TRANSLATE(*state)) {
4582                                 if (direction == PF_IN) {
4583                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4584                                             daddr, &(*state)->lan.addr,
4585                                             (*state)->lan.port, &uh.uh_sum,
4586                                             pd2.ip_sum, icmpsum,
4587                                             pd->ip_sum, 1, pd2.af);
4588                                 } else {
4589                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4590                                             saddr, &(*state)->gwy.addr,
4591                                             (*state)->gwy.port, &uh.uh_sum,
4592                                             pd2.ip_sum, icmpsum,
4593                                             pd->ip_sum, 1, pd2.af);
4594                                 }
4595                                 switch (pd2.af) {
4596 #ifdef INET
4597                                 case AF_INET:
4598                                         m_copyback(m, off, ICMP_MINLEN,
4599                                             (caddr_t)pd->hdr.icmp);
4600                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4601                                         break;
4602 #endif /* INET */
4603 #ifdef INET6
4604                                 case AF_INET6:
4605                                         m_copyback(m, off,
4606                                             sizeof(struct icmp6_hdr),
4607                                             (caddr_t)pd->hdr.icmp6);
4608                                         m_copyback(m, ipoff2, sizeof(h2_6),
4609                                             (caddr_t)&h2_6);
4610                                         break;
4611 #endif /* INET6 */
4612                                 }
4613                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4614                         }
4615
4616                         return (PF_PASS);
4617                         break;
4618                 }
4619 #ifdef INET
4620                 case IPPROTO_ICMP: {
4621                         struct icmp             iih;
4622                         struct pf_state         key;
4623
4624                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4625                             NULL, NULL, pd2.af)) {
4626                                 DPFPRINTF(PF_DEBUG_MISC,
4627                                     ("pf: ICMP error message too short i"
4628                                     "(icmp)\n"));
4629                                 return (PF_DROP);
4630                         }
4631
4632                         key.af = pd2.af;
4633                         key.proto = IPPROTO_ICMP;
4634                         if (direction == PF_IN) {
4635                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4636                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4637                                 key.ext.port = iih.icmp_id;
4638                                 key.gwy.port = iih.icmp_id;
4639                         } else {
4640                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4641                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4642                                 key.lan.port = iih.icmp_id;
4643                                 key.ext.port = iih.icmp_id;
4644                         }
4645
4646                         STATE_LOOKUP();
4647
4648                         if (STATE_TRANSLATE(*state)) {
4649                                 if (direction == PF_IN) {
4650                                         pf_change_icmp(pd2.src, &iih.icmp_id,
4651                                             daddr, &(*state)->lan.addr,
4652                                             (*state)->lan.port, NULL,
4653                                             pd2.ip_sum, icmpsum,
4654                                             pd->ip_sum, 0, AF_INET);
4655                                 } else {
4656                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
4657                                             saddr, &(*state)->gwy.addr,
4658                                             (*state)->gwy.port, NULL,
4659                                             pd2.ip_sum, icmpsum,
4660                                             pd->ip_sum, 0, AF_INET);
4661                                 }
4662                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
4663                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4664                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
4665                         }
4666
4667                         return (PF_PASS);
4668                         break;
4669                 }
4670 #endif /* INET */
4671 #ifdef INET6
4672                 case IPPROTO_ICMPV6: {
4673                         struct icmp6_hdr        iih;
4674                         struct pf_state         key;
4675
4676                         if (!pf_pull_hdr(m, off2, &iih,
4677                             sizeof(struct icmp6_hdr), NULL, NULL, pd2.af)) {
4678                                 DPFPRINTF(PF_DEBUG_MISC,
4679                                     ("pf: ICMP error message too short "
4680                                     "(icmp6)\n"));
4681                                 return (PF_DROP);
4682                         }
4683
4684                         key.af = pd2.af;
4685                         key.proto = IPPROTO_ICMPV6;
4686                         if (direction == PF_IN) {
4687                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4688                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4689                                 key.ext.port = iih.icmp6_id;
4690                                 key.gwy.port = iih.icmp6_id;
4691                         } else {
4692                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4693                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4694                                 key.lan.port = iih.icmp6_id;
4695                                 key.ext.port = iih.icmp6_id;
4696                         }
4697
4698                         STATE_LOOKUP();
4699
4700                         if (STATE_TRANSLATE(*state)) {
4701                                 if (direction == PF_IN) {
4702                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
4703                                             daddr, &(*state)->lan.addr,
4704                                             (*state)->lan.port, NULL,
4705                                             pd2.ip_sum, icmpsum,
4706                                             pd->ip_sum, 0, AF_INET6);
4707                                 } else {
4708                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
4709                                             saddr, &(*state)->gwy.addr,
4710                                             (*state)->gwy.port, NULL,
4711                                             pd2.ip_sum, icmpsum,
4712                                             pd->ip_sum, 0, AF_INET6);
4713                                 }
4714                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4715                                     (caddr_t)pd->hdr.icmp6);
4716                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
4717                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
4718                                     (caddr_t)&iih);
4719                         }
4720
4721                         return (PF_PASS);
4722                         break;
4723                 }
4724 #endif /* INET6 */
4725                 default: {
4726                         struct pf_state         key;
4727
4728                         key.af = pd2.af;
4729                         key.proto = pd2.proto;
4730                         if (direction == PF_IN) {
4731                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4732                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4733                                 key.ext.port = 0;
4734                                 key.gwy.port = 0;
4735                         } else {
4736                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4737                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4738                                 key.lan.port = 0;
4739                                 key.ext.port = 0;
4740                         }
4741
4742                         STATE_LOOKUP();
4743
4744                         if (STATE_TRANSLATE(*state)) {
4745                                 if (direction == PF_IN) {
4746                                         pf_change_icmp(pd2.src, NULL,
4747                                             daddr, &(*state)->lan.addr,
4748                                             0, NULL,
4749                                             pd2.ip_sum, icmpsum,
4750                                             pd->ip_sum, 0, pd2.af);
4751                                 } else {
4752                                         pf_change_icmp(pd2.dst, NULL,
4753                                             saddr, &(*state)->gwy.addr,
4754                                             0, NULL,
4755                                             pd2.ip_sum, icmpsum,
4756                                             pd->ip_sum, 0, pd2.af);
4757                                 }
4758                                 switch (pd2.af) {
4759 #ifdef INET
4760                                 case AF_INET:
4761                                         m_copyback(m, off, ICMP_MINLEN,
4762                                             (caddr_t)pd->hdr.icmp);
4763                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4764                                         break;
4765 #endif /* INET */
4766 #ifdef INET6
4767                                 case AF_INET6:
4768                                         m_copyback(m, off,
4769                                             sizeof(struct icmp6_hdr),
4770                                             (caddr_t)pd->hdr.icmp6);
4771                                         m_copyback(m, ipoff2, sizeof(h2_6),
4772                                             (caddr_t)&h2_6);
4773                                         break;
4774 #endif /* INET6 */
4775                                 }
4776                         }
4777
4778                         return (PF_PASS);
4779                         break;
4780                 }
4781                 }
4782         }
4783 }
4784
4785 int
4786 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
4787     struct pf_pdesc *pd)
4788 {
4789         struct pf_state_peer    *src, *dst;
4790         struct pf_state          key;
4791
4792         key.af = pd->af;
4793         key.proto = pd->proto;
4794         if (direction == PF_IN) {
4795                 PF_ACPY(&key.ext.addr, pd->src, key.af);
4796                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4797                 key.ext.port = 0;
4798                 key.gwy.port = 0;
4799         } else {
4800                 PF_ACPY(&key.lan.addr, pd->src, key.af);
4801                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4802                 key.lan.port = 0;
4803                 key.ext.port = 0;
4804         }
4805
4806         STATE_LOOKUP();
4807
4808         if (direction == (*state)->direction) {
4809                 src = &(*state)->src;
4810                 dst = &(*state)->dst;
4811         } else {
4812                 src = &(*state)->dst;
4813                 dst = &(*state)->src;
4814         }
4815
4816         /* update states */
4817         if (src->state < PFOTHERS_SINGLE)
4818                 src->state = PFOTHERS_SINGLE;
4819         if (dst->state == PFOTHERS_SINGLE)
4820                 dst->state = PFOTHERS_MULTIPLE;
4821
4822         /* update expire time */
4823         (*state)->expire = time_second;
4824         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
4825                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
4826         else
4827                 (*state)->timeout = PFTM_OTHER_SINGLE;
4828
4829         /* translate source/destination address, if necessary */
4830         if (STATE_TRANSLATE(*state)) {
4831                 if (direction == PF_OUT)
4832                         switch (pd->af) {
4833 #ifdef INET
4834                         case AF_INET:
4835                                 pf_change_a(&pd->src->v4.s_addr,
4836                                     pd->ip_sum, (*state)->gwy.addr.v4.s_addr,
4837                                     0);
4838                                 break;
4839 #endif /* INET */
4840 #ifdef INET6
4841                         case AF_INET6:
4842                                 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af);
4843                                 break;
4844 #endif /* INET6 */
4845                         }
4846                 else
4847                         switch (pd->af) {
4848 #ifdef INET
4849                         case AF_INET:
4850                                 pf_change_a(&pd->dst->v4.s_addr,
4851                                     pd->ip_sum, (*state)->lan.addr.v4.s_addr,
4852                                     0);
4853                                 break;
4854 #endif /* INET */
4855 #ifdef INET6
4856                         case AF_INET6:
4857                                 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af);
4858                                 break;
4859 #endif /* INET6 */
4860                         }
4861         }
4862
4863         return (PF_PASS);
4864 }
4865
4866 /*
4867  * ipoff and off are measured from the start of the mbuf chain.
4868  * h must be at "ipoff" on the mbuf chain.
4869  */
4870 void *
4871 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
4872     u_short *actionp, u_short *reasonp, sa_family_t af)
4873 {
4874         switch (af) {
4875 #ifdef INET
4876         case AF_INET: {
4877                 struct ip       *h = mtod(m, struct ip *);
4878                 u_int16_t        fragoff = (h->ip_off & IP_OFFMASK) << 3;
4879
4880                 if (fragoff) {
4881                         if (fragoff >= len)
4882                                 ACTION_SET(actionp, PF_PASS);
4883                         else {
4884                                 ACTION_SET(actionp, PF_DROP);
4885                                 REASON_SET(reasonp, PFRES_FRAG);
4886                         }
4887                         return (NULL);
4888                 }
4889                 if (m->m_pkthdr.len < off + len ||
4890                     h->ip_len < off + len) {
4891                         ACTION_SET(actionp, PF_DROP);
4892                         REASON_SET(reasonp, PFRES_SHORT);
4893                         return (NULL);
4894                 }
4895                 break;
4896         }
4897 #endif /* INET */
4898 #ifdef INET6
4899         case AF_INET6: {
4900                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
4901
4902                 if (m->m_pkthdr.len < off + len ||
4903                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
4904                     (unsigned)(off + len)) {
4905                         ACTION_SET(actionp, PF_DROP);
4906                         REASON_SET(reasonp, PFRES_SHORT);
4907                         return (NULL);
4908                 }
4909                 break;
4910         }
4911 #endif /* INET6 */
4912         }
4913         m_copydata(m, off, len, p);
4914         return (p);
4915 }
4916
4917 int
4918 pf_routable(struct pf_addr *addr, sa_family_t af)
4919 {
4920         struct sockaddr_in      *dst;
4921         struct route             ro;
4922         int                      ret = 0;
4923
4924         bzero(&ro, sizeof(ro));
4925         dst = satosin(&ro.ro_dst);
4926         dst->sin_family = af;
4927         dst->sin_len = sizeof(*dst);
4928         dst->sin_addr = addr->v4;
4929         rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
4930
4931         if (ro.ro_rt != NULL) {
4932                 ret = 1;
4933                 RTFREE(ro.ro_rt);
4934         }
4935
4936         return (ret);
4937 }
4938
4939 #ifdef INET
4940 void
4941 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
4942     struct pf_state *s)
4943 {
4944         struct mbuf             *m0, *m1;
4945         struct route             iproute;
4946         struct route            *ro = NULL;
4947         struct sockaddr_in      *dst;
4948         struct ip               *ip;
4949         struct ifnet            *ifp = NULL;
4950         struct pf_addr           naddr;
4951         struct pf_src_node      *sn = NULL;
4952         int                      error = 0;
4953         int sw_csum;
4954
4955         if (m == NULL || *m == NULL || r == NULL ||
4956             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
4957                 panic("pf_route: invalid parameters");
4958
4959         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
4960                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
4961                 (*m)->m_pkthdr.pf_routed = 1;
4962         } else {
4963                 if ((*m)->m_pkthdr.pf_routed > 3) {
4964                         m0 = *m;
4965                         *m = NULL;
4966                         goto bad;
4967                 }
4968                 (*m)->m_pkthdr.pf_routed++;
4969         }
4970
4971         if (r->rt == PF_DUPTO) {
4972                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
4973                         return;
4974         } else {
4975                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
4976                         return;
4977                 m0 = *m;
4978         }
4979
4980         if (m0->m_len < sizeof(struct ip))
4981                 panic("pf_route: m0->m_len < sizeof(struct ip)");
4982         ip = mtod(m0, struct ip *);
4983
4984         ro = &iproute;
4985         bzero((caddr_t)ro, sizeof(*ro));
4986         dst = satosin(&ro->ro_dst);
4987         dst->sin_family = AF_INET;
4988         dst->sin_len = sizeof(*dst);
4989         dst->sin_addr = ip->ip_dst;
4990
4991         if (r->rt == PF_FASTROUTE) {
4992                 rtalloc(ro);
4993                 if (ro->ro_rt == 0) {
4994                         ipstat.ips_noroute++;
4995                         goto bad;
4996                 }
4997
4998                 ifp = ro->ro_rt->rt_ifp;
4999                 ro->ro_rt->rt_use++;
5000
5001                 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
5002                         dst = satosin(ro->ro_rt->rt_gateway);
5003         } else {
5004                 if (TAILQ_EMPTY(&r->rpool.list))
5005                         panic("pf_route: TAILQ_EMPTY(&r->rpool.list)");
5006                 if (s == NULL) {
5007                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5008                             &naddr, NULL, &sn);
5009                         if (!PF_AZERO(&naddr, AF_INET))
5010                                 dst->sin_addr.s_addr = naddr.v4.s_addr;
5011                         ifp = r->rpool.cur->kif ?
5012                             r->rpool.cur->kif->pfik_ifp : NULL;
5013                 } else {
5014                         if (!PF_AZERO(&s->rt_addr, AF_INET))
5015                                 dst->sin_addr.s_addr =
5016                                     s->rt_addr.v4.s_addr;
5017                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5018                 }
5019         }
5020         if (ifp == NULL)
5021                 goto bad;
5022
5023         if (oifp != ifp) {
5024                 if (pf_test(PF_OUT, ifp, &m0) != PF_PASS)
5025                         goto bad;
5026                 else if (m0 == NULL)
5027                         goto done;
5028                 if (m0->m_len < sizeof(struct ip))
5029                         panic("pf_route: m0->m_len < sizeof(struct ip)");
5030                 ip = mtod(m0, struct ip *);
5031         }
5032
5033         /* Copied from ip_output. */
5034         m0->m_pkthdr.csum_flags |= CSUM_IP;
5035         sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
5036         if (sw_csum & CSUM_DELAY_DATA) {
5037                 in_delayed_cksum(m0);
5038                 sw_csum &= ~CSUM_DELAY_DATA;
5039         }
5040         m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
5041
5042         /*
5043          * If small enough for interface, or the interface will take
5044          * care of the fragmentation for us, can just send directly.
5045          */
5046         if (ip->ip_len <= ifp->if_mtu || ((ifp->if_hwassist & CSUM_FRAGMENT) &&
5047                 (ip->ip_off & IP_DF) == 0)) {
5048                 ip->ip_len = htons(ip->ip_len);
5049                 ip->ip_off = htons(ip->ip_off);
5050                 ip->ip_sum = 0;
5051                 if (sw_csum & CSUM_DELAY_IP) {
5052                         /* From KAME */
5053                         if (ip->ip_v == IPVERSION &&
5054                             (ip->ip_hl << 2) == sizeof(*ip)) {
5055                                 ip->ip_sum = in_cksum_hdr(ip);
5056                         } else {
5057                                 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5058                         }
5059                 }
5060
5061                 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt);
5062                 goto done;
5063         }
5064
5065         /*
5066          * Too large for interface; fragment if possible.
5067          * Must be able to put at least 8 bytes per fragment.
5068          */
5069         if (ip->ip_off & IP_DF) {
5070                 ipstat.ips_cantfrag++;
5071                 if (r->rt != PF_DUPTO) {
5072                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5073                             ifp->if_mtu);
5074                         goto done;
5075                 } else
5076                         goto bad;
5077         }
5078
5079         m1 = m0;
5080         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5081         if (error)
5082                 goto bad;
5083
5084         for (m0 = m1; m0; m0 = m1) {
5085                 m1 = m0->m_nextpkt;
5086                 m0->m_nextpkt = 0;
5087                 if (error == 0) {
5088                         error = ifp->if_output(ifp, m0, sintosa(dst), NULL);
5089                 } else {
5090                         m_freem(m0);
5091                 }
5092         }
5093
5094         if (error == 0)
5095                 ipstat.ips_fragmented++;
5096
5097 done:
5098         if (r->rt != PF_DUPTO)
5099                 *m = NULL;
5100         if (ro == &iproute && ro->ro_rt)
5101                 RTFREE(ro->ro_rt);
5102         return;
5103
5104 bad:
5105         m_freem(m0);
5106         goto done;
5107 }
5108 #endif /* INET */
5109
5110 #ifdef INET6
5111 void
5112 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5113     struct pf_state *s)
5114 {
5115         struct mbuf             *m0;
5116         struct route_in6         ip6route;
5117         struct route_in6        *ro;
5118         struct sockaddr_in6     *dst;
5119         struct ip6_hdr          *ip6;
5120         struct ifnet            *ifp = NULL;
5121         struct pf_addr           naddr;
5122         struct pf_src_node      *sn = NULL;
5123         int                      error = 0;
5124
5125         if (m == NULL || *m == NULL || r == NULL ||
5126             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5127                 panic("pf_route6: invalid parameters");
5128
5129         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5130                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5131                 (*m)->m_pkthdr.pf_routed = 1;
5132         } else {
5133                 if ((*m)->m_pkthdr.pf_routed > 3) {
5134                         m0 = *m;
5135                         *m = NULL;
5136                         goto bad;
5137                 }
5138                 (*m)->m_pkthdr.pf_routed++;
5139         }
5140
5141         if (r->rt == PF_DUPTO) {
5142                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5143                         return;
5144         } else {
5145                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5146                         return;
5147                 m0 = *m;
5148         }
5149
5150         if (m0->m_len < sizeof(struct ip6_hdr))
5151                 panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5152         ip6 = mtod(m0, struct ip6_hdr *);
5153
5154         ro = &ip6route;
5155         bzero((caddr_t)ro, sizeof(*ro));
5156         dst = (struct sockaddr_in6 *)&ro->ro_dst;
5157         dst->sin6_family = AF_INET6;
5158         dst->sin6_len = sizeof(*dst);
5159         dst->sin6_addr = ip6->ip6_dst;
5160
5161         /* Cheat. */
5162         if (r->rt == PF_FASTROUTE) {
5163                 m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED;
5164                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5165                 return;
5166         }
5167
5168         if (TAILQ_EMPTY(&r->rpool.list))
5169                 panic("pf_route6: TAILQ_EMPTY(&r->rpool.list)");
5170         if (s == NULL) {
5171                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5172                     &naddr, NULL, &sn);
5173                 if (!PF_AZERO(&naddr, AF_INET6))
5174                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5175                             &naddr, AF_INET6);
5176                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5177         } else {
5178                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5179                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5180                             &s->rt_addr, AF_INET6);
5181                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5182         }
5183         if (ifp == NULL)
5184                 goto bad;
5185
5186         if (oifp != ifp) {
5187                 if (pf_test6(PF_OUT, ifp, &m0) != PF_PASS)
5188                         goto bad;
5189                 else if (m0 == NULL)
5190                         goto done;
5191                 if (m0->m_len < sizeof(struct ip6_hdr))
5192                         panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5193                 ip6 = mtod(m0, struct ip6_hdr *);
5194         }
5195
5196         /*
5197          * If the packet is too large for the outgoing interface,
5198          * send back an icmp6 error.
5199          */
5200         if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5201                 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5202         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5203                 error = nd6_output(ifp, ifp, m0, dst, NULL);
5204         } else {
5205                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5206                 if (r->rt != PF_DUPTO)
5207                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5208                 else
5209                         goto bad;
5210         }
5211
5212 done:
5213         if (r->rt != PF_DUPTO)
5214                 *m = NULL;
5215         return;
5216
5217 bad:
5218         m_freem(m0);
5219         goto done;
5220 }
5221 #endif /* INET6 */
5222
5223
5224 /*
5225  * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5226  *   off is the offset where the protocol header starts
5227  *   len is the total length of protocol header plus payload
5228  * returns 0 when the checksum is valid, otherwise returns 1.
5229  */
5230 /*
5231  * XXX
5232  * FreeBSD supports cksum offload for the following drivers.
5233  * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5234  * If we can make full use of it we would outperform ipfw/ipfilter in
5235  * very heavy traffic.
5236  * I have not tested 'cause I don't have NICs that supports cksum offload.
5237  * (There might be problems. Typical phenomena would be
5238  *   1. No route message for UDP packet.
5239  *   2. No connection acceptance from external hosts regardless of rule set.)
5240  */
5241 int
5242 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5243     sa_family_t af)
5244 {
5245         u_int16_t sum = 0;
5246         int hw_assist = 0;
5247         struct ip *ip;
5248
5249         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5250                 return (1);
5251         if (m->m_pkthdr.len < off + len)
5252                 return (1);
5253
5254         switch (p) {
5255         case IPPROTO_TCP:
5256         case IPPROTO_UDP:
5257                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5258                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5259                                 sum = m->m_pkthdr.csum_data;
5260                         } else {
5261                                 ip = mtod(m, struct ip *);
5262                                 sum = in_pseudo(ip->ip_src.s_addr,
5263                                         ip->ip_dst.s_addr, htonl((u_short)len +
5264                                         m->m_pkthdr.csum_data + p));
5265                         }
5266                         sum ^= 0xffff;
5267                         ++hw_assist;
5268                 }
5269                 break;
5270         case IPPROTO_ICMP:
5271 #ifdef INET6
5272         case IPPROTO_ICMPV6:
5273 #endif /* INET6 */
5274                 break;
5275         default:
5276                 return (1);
5277         }
5278
5279         if (!hw_assist) {
5280                 switch (af) {
5281                 case AF_INET:
5282                         if (p == IPPROTO_ICMP) {
5283                                 if (m->m_len < off)
5284                                         return (1);
5285                                 m->m_data += off;
5286                                 m->m_len -= off;
5287                                 sum = in_cksum(m, len);
5288                                 m->m_data -= off;
5289                                 m->m_len += off;
5290                         } else {
5291                                 if (m->m_len < sizeof(struct ip))
5292                                         return (1);
5293                                 sum = in_cksum_range(m, p, off, len);
5294                                 if (sum == 0) {
5295                                         m->m_pkthdr.csum_flags |=
5296                                             (CSUM_DATA_VALID |
5297                                              CSUM_PSEUDO_HDR);
5298                                         m->m_pkthdr.csum_data = 0xffff;
5299                                 }
5300                         }
5301                         break;
5302 #ifdef INET6
5303                 case AF_INET6:
5304                         if (m->m_len < sizeof(struct ip6_hdr))
5305                                 return (1);
5306                         sum = in6_cksum(m, p, off, len);
5307                         /*
5308                          * XXX
5309                          * IPv6 H/W cksum off-load not supported yet!
5310                          *
5311                          * if (sum == 0) {
5312                          *      m->m_pkthdr.csum_flags |=
5313                          *          (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5314                          *      m->m_pkthdr.csum_data = 0xffff;
5315                          *}
5316                          */
5317                         break;
5318 #endif /* INET6 */
5319                 default:
5320                         return (1);
5321                 }
5322         }
5323         if (sum) {
5324                 switch (p) {
5325                 case IPPROTO_TCP:
5326                         tcpstat.tcps_rcvbadsum++;
5327                         break;
5328                 case IPPROTO_UDP:
5329                         udpstat.udps_badsum++;
5330                         break;
5331                 case IPPROTO_ICMP:
5332                         icmpstat.icps_checksum++;
5333                         break;
5334 #ifdef INET6
5335                 case IPPROTO_ICMPV6:
5336                         icmp6stat.icp6s_checksum++;
5337                         break;
5338 #endif /* INET6 */
5339                 }
5340                 return (1);
5341         }
5342         return (0);
5343 }
5344
5345 #ifdef INET
5346 int
5347 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0)
5348 {
5349         struct pfi_kif          *kif;
5350         u_short                  action, reason = 0, log = 0;
5351         struct mbuf             *m = *m0;
5352         struct ip               *h = NULL;
5353         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5354         struct pf_state         *s = NULL;
5355         struct pf_ruleset       *ruleset = NULL;
5356         struct pf_pdesc          pd;
5357         int                      off, dirndx, pqid = 0;
5358
5359         if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED))
5360                 return (PF_PASS);
5361
5362         kif = pfi_index2kif[ifp->if_index];
5363         if (kif == NULL)
5364                 return (PF_DROP);
5365
5366 #ifdef DIAGNOSTIC
5367         if ((m->m_flags & M_PKTHDR) == 0)
5368                 panic("non-M_PKTHDR is passed to pf_test");
5369 #endif
5370
5371         memset(&pd, 0, sizeof(pd));
5372         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5373                 action = PF_DROP;
5374                 REASON_SET(&reason, PFRES_SHORT);
5375                 log = 1;
5376                 goto done;
5377         }
5378
5379         /* We do IP header normalization and packet reassembly here */
5380         if (pf_normalize_ip(m0, dir, kif, &reason) != PF_PASS) {
5381                 action = PF_DROP;
5382                 goto done;
5383         }
5384         m = *m0;
5385         h = mtod(m, struct ip *);
5386
5387         off = h->ip_hl << 2;
5388         if (off < (int)sizeof(*h)) {
5389                 action = PF_DROP;
5390                 REASON_SET(&reason, PFRES_SHORT);
5391                 log = 1;
5392                 goto done;
5393         }
5394
5395         pd.src = (struct pf_addr *)&h->ip_src;
5396         pd.dst = (struct pf_addr *)&h->ip_dst;
5397         PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
5398         pd.ip_sum = &h->ip_sum;
5399         pd.proto = h->ip_p;
5400         pd.af = AF_INET;
5401         pd.tos = h->ip_tos;
5402         pd.tot_len = h->ip_len;
5403
5404         /* handle fragments that didn't get reassembled by normalization */
5405         if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5406                 action = pf_test_fragment(&r, dir, kif, m, h,
5407                     &pd, &a, &ruleset);
5408                 goto done;
5409         }
5410
5411         switch (h->ip_p) {
5412
5413         case IPPROTO_TCP: {
5414                 struct tcphdr   th;
5415
5416                 pd.hdr.tcp = &th;
5417                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5418                     &action, &reason, AF_INET)) {
5419                         log = action != PF_PASS;
5420                         goto done;
5421                 }
5422                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5423                     h->ip_len - off, IPPROTO_TCP, AF_INET)) {
5424                         action = PF_DROP;
5425                         goto done;
5426                 }
5427                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5428                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5429                         pqid = 1;
5430                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5431                 if (action == PF_DROP)
5432                         goto done;
5433                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5434                     &reason);
5435                 if (action == PF_PASS) {
5436 #if NPFSYNC
5437                         pfsync_update_state(s);
5438 #endif
5439                         r = s->rule.ptr;
5440                         a = s->anchor.ptr;
5441                         log = s->log;
5442                 } else if (s == NULL)
5443                         action = pf_test_tcp(&r, &s, dir, kif,
5444                             m, off, h, &pd, &a, &ruleset);
5445                 break;
5446         }
5447
5448         case IPPROTO_UDP: {
5449                 struct udphdr   uh;
5450
5451                 pd.hdr.udp = &uh;
5452                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5453                     &action, &reason, AF_INET)) {
5454                         log = action != PF_PASS;
5455                         goto done;
5456                 }
5457                 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5458                     off, h->ip_len - off, IPPROTO_UDP, AF_INET)) {
5459                         action = PF_DROP;
5460                         goto done;
5461                 }
5462                 if (uh.uh_dport == 0 ||
5463                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5464                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5465                         action = PF_DROP;
5466                         goto done;
5467                 }
5468                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5469                 if (action == PF_PASS) {
5470 #if NPFSYNC
5471                         pfsync_update_state(s);
5472 #endif
5473                         r = s->rule.ptr;
5474                         a = s->anchor.ptr;
5475                         log = s->log;
5476                 } else if (s == NULL)
5477                         action = pf_test_udp(&r, &s, dir, kif,
5478                             m, off, h, &pd, &a, &ruleset);
5479                 break;
5480         }
5481
5482         case IPPROTO_ICMP: {
5483                 struct icmp     ih;
5484
5485                 pd.hdr.icmp = &ih;
5486                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5487                     &action, &reason, AF_INET)) {
5488                         log = action != PF_PASS;
5489                         goto done;
5490                 }
5491                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5492                     h->ip_len - off, IPPROTO_ICMP, AF_INET)) {
5493                         action = PF_DROP;
5494                         goto done;
5495                 }
5496                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd);
5497                 if (action == PF_PASS) {
5498 #if NPFSYNC
5499                         pfsync_update_state(s);
5500 #endif
5501                         r = s->rule.ptr;
5502                         a = s->anchor.ptr;
5503                         log = s->log;
5504                 } else if (s == NULL)
5505                         action = pf_test_icmp(&r, &s, dir, kif,
5506                             m, off, h, &pd, &a, &ruleset);
5507                 break;
5508         }
5509
5510         default:
5511                 action = pf_test_state_other(&s, dir, kif, &pd);
5512                 if (action == PF_PASS) {
5513 #if NPFSYNC
5514                         pfsync_update_state(s);
5515 #endif
5516                         r = s->rule.ptr;
5517                         a = s->anchor.ptr;
5518                         log = s->log;
5519                 } else if (s == NULL)
5520                         action = pf_test_other(&r, &s, dir, kif, m, off, h,
5521                             &pd, &a, &ruleset);
5522                 break;
5523         }
5524
5525 done:
5526         if (action == PF_PASS && h->ip_hl > 5 &&
5527             !((s && s->allow_opts) || r->allow_opts)) {
5528                 action = PF_DROP;
5529                 REASON_SET(&reason, PFRES_SHORT);
5530                 log = 1;
5531                 DPFPRINTF(PF_DEBUG_MISC,
5532                     ("pf: dropping packet with ip options\n"));
5533         }
5534
5535 #ifdef ALTQ
5536         if (action == PF_PASS && r->qid) {
5537                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
5538                 if (pd.tos == IPTOS_LOWDELAY)
5539                         m->m_pkthdr.altq_qid = r->pqid;
5540                 else
5541                         m->m_pkthdr.altq_qid = r->qid;
5542                 if (s) {
5543                         KKASSERT(s->hash != 0);
5544                         m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED;
5545                         m->m_pkthdr.altq_state_hash = s->hash;
5546                 }
5547                 m->m_pkthdr.ecn_af = AF_INET;
5548                 m->m_pkthdr.header = h;
5549         }
5550 #endif
5551
5552         /*
5553          * connections redirected to loopback should not match sockets
5554          * bound specifically to loopback due to security implications,
5555          * see tcp_input() and in_pcblookup_listen().
5556          */
5557         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5558             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5559             (s->nat_rule.ptr->action == PF_RDR ||
5560             s->nat_rule.ptr->action == PF_BINAT) &&
5561             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
5562                 action = PF_DROP;
5563                 REASON_SET(&reason, PFRES_MEMORY);
5564         }
5565
5566         m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5567
5568         if (log)
5569                 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset);
5570
5571         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5572         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
5573
5574         if (action == PF_PASS || r->action == PF_DROP) {
5575                 r->packets++;
5576                 r->bytes += pd.tot_len;
5577                 if (a != NULL) {
5578                         a->packets++;
5579                         a->bytes += pd.tot_len;
5580                 }
5581                 if (s != NULL) {
5582                         dirndx = (dir == s->direction) ? 0 : 1;
5583                         s->packets[dirndx]++;
5584                         s->bytes[dirndx] += pd.tot_len;
5585                         if (s->nat_rule.ptr != NULL) {
5586                                 s->nat_rule.ptr->packets++;
5587                                 s->nat_rule.ptr->bytes += pd.tot_len;
5588                         }
5589                         if (s->src_node != NULL) {
5590                                 s->src_node->packets++;
5591                                 s->src_node->bytes += pd.tot_len;
5592                         }
5593                         if (s->nat_src_node != NULL) {
5594                                 s->nat_src_node->packets++;
5595                                 s->nat_src_node->bytes += pd.tot_len;
5596                         }
5597                 }
5598                 tr = r;
5599                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5600                 if (nr != NULL) {
5601                         struct pf_addr *x;
5602                         /*
5603                          * XXX: we need to make sure that the addresses
5604                          * passed to pfr_update_stats() are the same than
5605                          * the addresses used during matching (pfr_match)
5606                          */
5607                         if (r == &pf_default_rule) {
5608                                 tr = nr;
5609                                 x = (s == NULL || s->direction == dir) ?
5610                                     &pd.baddr : &pd.naddr;
5611                         } else
5612                                 x = (s == NULL || s->direction == dir) ?
5613                                     &pd.naddr : &pd.baddr;
5614                         if (x == &pd.baddr || s == NULL) {
5615                                 /* we need to change the address */
5616                                 if (dir == PF_OUT)
5617                                         pd.src = x;
5618                                 else
5619                                         pd.dst = x;
5620                         }
5621                 }
5622                 if (tr->src.addr.type == PF_ADDR_TABLE)
5623                         pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5624                             s->direction == dir) ? pd.src : pd.dst, pd.af,
5625                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5626                             tr->src.not);
5627                 if (tr->dst.addr.type == PF_ADDR_TABLE)
5628                         pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5629                             s->direction == dir) ? pd.dst : pd.src, pd.af,
5630                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5631                             tr->dst.not);
5632         }
5633
5634
5635         if (action == PF_SYNPROXY_DROP) {
5636                 m_freem(*m0);
5637                 *m0 = NULL;
5638                 action = PF_PASS;
5639         } else if (r->rt)
5640                 /* pf_route can free the mbuf causing *m0 to become NULL */
5641                 pf_route(m0, r, dir, ifp, s);
5642
5643         return (action);
5644 }
5645 #endif /* INET */
5646
5647 #ifdef INET6
5648 int
5649 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0)
5650 {
5651         struct pfi_kif          *kif;
5652         u_short                  action, reason = 0, log = 0;
5653         struct mbuf             *m = *m0;
5654         struct ip6_hdr          *h = NULL;
5655         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5656         struct pf_state         *s = NULL;
5657         struct pf_ruleset       *ruleset = NULL;
5658         struct pf_pdesc          pd;
5659         int                      off, terminal = 0, dirndx;
5660
5661         if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED))
5662                 return (PF_PASS);
5663
5664         kif = pfi_index2kif[ifp->if_index];
5665         if (kif == NULL)
5666                 return (PF_DROP);
5667
5668 #ifdef DIAGNOSTIC
5669         if ((m->m_flags & M_PKTHDR) == 0)
5670                 panic("non-M_PKTHDR is passed to pf_test");
5671 #endif
5672
5673         memset(&pd, 0, sizeof(pd));
5674         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5675                 action = PF_DROP;
5676                 REASON_SET(&reason, PFRES_SHORT);
5677                 log = 1;
5678                 goto done;
5679         }
5680
5681         /* We do IP header normalization and packet reassembly here */
5682         if (pf_normalize_ip6(m0, dir, kif, &reason) != PF_PASS) {
5683                 action = PF_DROP;
5684                 goto done;
5685         }
5686         m = *m0;
5687         h = mtod(m, struct ip6_hdr *);
5688
5689         pd.src = (struct pf_addr *)&h->ip6_src;
5690         pd.dst = (struct pf_addr *)&h->ip6_dst;
5691         PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
5692         pd.ip_sum = NULL;
5693         pd.af = AF_INET6;
5694         pd.tos = 0;
5695         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
5696
5697         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
5698         pd.proto = h->ip6_nxt;
5699         do {
5700                 switch (pd.proto) {
5701                 case IPPROTO_FRAGMENT:
5702                         action = pf_test_fragment(&r, dir, kif, m, h,
5703                             &pd, &a, &ruleset);
5704                         if (action == PF_DROP)
5705                                 REASON_SET(&reason, PFRES_FRAG);
5706                         goto done;
5707                 case IPPROTO_AH:
5708                 case IPPROTO_HOPOPTS:
5709                 case IPPROTO_ROUTING:
5710                 case IPPROTO_DSTOPTS: {
5711                         /* get next header and header length */
5712                         struct ip6_ext  opt6;
5713
5714                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
5715                             NULL, NULL, pd.af)) {
5716                                 DPFPRINTF(PF_DEBUG_MISC,
5717                                     ("pf: IPv6 short opt\n"));
5718                                 action = PF_DROP;
5719                                 REASON_SET(&reason, PFRES_SHORT);
5720                                 log = 1;
5721                                 goto done;
5722                         }
5723                         if (pd.proto == IPPROTO_AH)
5724                                 off += (opt6.ip6e_len + 2) * 4;
5725                         else
5726                                 off += (opt6.ip6e_len + 1) * 8;
5727                         pd.proto = opt6.ip6e_nxt;
5728                         /* goto the next header */
5729                         break;
5730                 }
5731                 default:
5732                         terminal++;
5733                         break;
5734                 }
5735         } while (!terminal);
5736
5737         switch (pd.proto) {
5738
5739         case IPPROTO_TCP: {
5740                 struct tcphdr   th;
5741
5742                 pd.hdr.tcp = &th;
5743                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5744                     &action, &reason, AF_INET6)) {
5745                         log = action != PF_PASS;
5746                         goto done;
5747                 }
5748                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5749                     ntohs(h->ip6_plen), IPPROTO_TCP, AF_INET6)) {
5750                         action = PF_DROP;
5751                         goto done;
5752                 }
5753                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5754                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5755                 if (action == PF_DROP)
5756                         goto done;
5757                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5758                     &reason);
5759                 if (action == PF_PASS) {
5760 #if NPFSYNC
5761                         pfsync_update_state(s);
5762 #endif
5763                         r = s->rule.ptr;
5764                         a = s->anchor.ptr;
5765                         log = s->log;
5766                 } else if (s == NULL)
5767                         action = pf_test_tcp(&r, &s, dir, kif,
5768                             m, off, h, &pd, &a, &ruleset);
5769                 break;
5770         }
5771
5772         case IPPROTO_UDP: {
5773                 struct udphdr   uh;
5774
5775                 pd.hdr.udp = &uh;
5776                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5777                     &action, &reason, AF_INET6)) {
5778                         log = action != PF_PASS;
5779                         goto done;
5780                 }
5781                 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5782                     off, ntohs(h->ip6_plen), IPPROTO_UDP, AF_INET6)) {
5783                         action = PF_DROP;
5784                         goto done;
5785                 }
5786                 if (uh.uh_dport == 0 ||
5787                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5788                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5789                         action = PF_DROP;
5790                         goto done;
5791                 }
5792                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5793                 if (action == PF_PASS) {
5794 #if NPFSYNC
5795                         pfsync_update_state(s);
5796 #endif
5797                         r = s->rule.ptr;
5798                         a = s->anchor.ptr;
5799                         log = s->log;
5800                 } else if (s == NULL)
5801                         action = pf_test_udp(&r, &s, dir, kif,
5802                             m, off, h, &pd, &a, &ruleset);
5803                 break;
5804         }
5805
5806         case IPPROTO_ICMPV6: {
5807                 struct icmp6_hdr        ih;
5808
5809                 pd.hdr.icmp6 = &ih;
5810                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
5811                     &action, &reason, AF_INET6)) {
5812                         log = action != PF_PASS;
5813                         goto done;
5814                 }
5815                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5816                     ntohs(h->ip6_plen), IPPROTO_ICMPV6, AF_INET6)) {
5817                         action = PF_DROP;
5818                         goto done;
5819                 }
5820                 action = pf_test_state_icmp(&s, dir, kif,
5821                     m, off, h, &pd);
5822                 if (action == PF_PASS) {
5823 #if NPFSYNC
5824                         pfsync_update_state(s);
5825 #endif
5826                         r = s->rule.ptr;
5827                         a = s->anchor.ptr;
5828                         log = s->log;
5829                 } else if (s == NULL)
5830                         action = pf_test_icmp(&r, &s, dir, kif,
5831                             m, off, h, &pd, &a, &ruleset);
5832                 break;
5833         }
5834
5835         default:
5836                 action = pf_test_state_other(&s, dir, kif, &pd);
5837                 if (action == PF_PASS) {
5838                         r = s->rule.ptr;
5839                         a = s->anchor.ptr;
5840                         log = s->log;
5841                 } else if (s == NULL)
5842                         action = pf_test_other(&r, &s, dir, kif, m, off, h,
5843                             &pd, &a, &ruleset);
5844                 break;
5845         }
5846
5847 done:
5848         /* XXX handle IPv6 options, if not allowed. not implemented. */
5849
5850 #ifdef ALTQ
5851         if (action == PF_PASS && r->qid) {
5852                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
5853                 if (pd.tos == IPTOS_LOWDELAY)
5854                         m->m_pkthdr.altq_qid = r->pqid;
5855                 else
5856                         m->m_pkthdr.altq_qid = r->qid;
5857                 if (s) {
5858                         KKASSERT(s->hash != 0);
5859                         m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED;
5860                         m->m_pkthdr.altq_state_hash = s->hash;
5861                 }
5862                 m->m_pkthdr.ecn_af = AF_INET6;
5863                 m->m_pkthdr.header = h;
5864         }
5865 #endif
5866
5867         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5868             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5869             (s->nat_rule.ptr->action == PF_RDR ||
5870             s->nat_rule.ptr->action == PF_BINAT) &&
5871             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) {
5872                 action = PF_DROP;
5873                 REASON_SET(&reason, PFRES_MEMORY);
5874         }
5875
5876         m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5877
5878         if (log)
5879                 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset);
5880
5881         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5882         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
5883
5884         if (action == PF_PASS || r->action == PF_DROP) {
5885                 r->packets++;
5886                 r->bytes += pd.tot_len;
5887                 if (a != NULL) {
5888                         a->packets++;
5889                         a->bytes += pd.tot_len;
5890                 }
5891                 if (s != NULL) {
5892                         dirndx = (dir == s->direction) ? 0 : 1;
5893                         s->packets[dirndx]++;
5894                         s->bytes[dirndx] += pd.tot_len;
5895                         if (s->nat_rule.ptr != NULL) {
5896                                 s->nat_rule.ptr->packets++;
5897                                 s->nat_rule.ptr->bytes += pd.tot_len;
5898                         }
5899                         if (s->src_node != NULL) {
5900                                 s->src_node->packets++;
5901                                 s->src_node->bytes += pd.tot_len;
5902                         }
5903                         if (s->nat_src_node != NULL) {
5904                                 s->nat_src_node->packets++;
5905                                 s->nat_src_node->bytes += pd.tot_len;
5906                         }
5907                 }
5908                 tr = r;
5909                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5910                 if (nr != NULL) {
5911                         struct pf_addr *x;
5912                         /*
5913                          * XXX: we need to make sure that the addresses
5914                          * passed to pfr_update_stats() are the same than
5915                          * the addresses used during matching (pfr_match)
5916                          */
5917                         if (r == &pf_default_rule) {
5918                                 tr = nr;
5919                                 x = (s == NULL || s->direction == dir) ?
5920                                     &pd.baddr : &pd.naddr;
5921                         } else {
5922                                 x = (s == NULL || s->direction == dir) ?
5923                                     &pd.naddr : &pd.baddr;
5924                         }
5925                         if (x == &pd.baddr || s == NULL) {
5926                                 if (dir == PF_OUT)
5927                                         pd.src = x;
5928                                 else
5929                                         pd.dst = x;
5930                         }
5931                 }
5932                 if (tr->src.addr.type == PF_ADDR_TABLE)
5933                         pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5934                             s->direction == dir) ? pd.src : pd.dst, pd.af,
5935                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5936                             tr->src.not);
5937                 if (tr->dst.addr.type == PF_ADDR_TABLE)
5938                         pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5939                             s->direction == dir) ? pd.dst : pd.src, pd.af,
5940                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5941                             tr->dst.not);
5942         }
5943
5944
5945         if (action == PF_SYNPROXY_DROP) {
5946                 m_freem(*m0);
5947                 *m0 = NULL;
5948                 action = PF_PASS;
5949         } else if (r->rt)
5950                 /* pf_route6 can free the mbuf causing *m0 to become NULL */
5951                 pf_route6(m0, r, dir, ifp, s);
5952
5953         return (action);
5954 }
5955 #endif /* INET6 */