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
2494         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2495
2496         if (direction == PF_OUT) {
2497                 bport = nport = th->th_sport;
2498                 /* check outgoing packet for BINAT/NAT */
2499                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2500                     saddr, th->th_sport, daddr, th->th_dport,
2501                     &pd->naddr, &nport)) != NULL) {
2502                         PF_ACPY(&pd->baddr, saddr, af);
2503                         pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
2504                             &th->th_sum, &pd->naddr, nport, 0, af);
2505                         rewrite++;
2506                         if (nr->natpass)
2507                                 r = NULL;
2508                         pd->nat_rule = nr;
2509                 }
2510         } else {
2511                 bport = nport = th->th_dport;
2512                 /* check incoming packet for BINAT/RDR */
2513                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
2514                     saddr, th->th_sport, daddr, th->th_dport,
2515                     &pd->naddr, &nport)) != NULL) {
2516                         PF_ACPY(&pd->baddr, daddr, af);
2517                         pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
2518                             &th->th_sum, &pd->naddr, nport, 0, af);
2519                         rewrite++;
2520                         if (nr->natpass)
2521                                 r = NULL;
2522                         pd->nat_rule = nr;
2523                 }
2524         }
2525
2526         while (r != NULL) {
2527                 r->evaluations++;
2528                 if (r->kif != NULL &&
2529                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
2530                         r = r->skip[PF_SKIP_IFP].ptr;
2531                 else if (r->direction && r->direction != direction)
2532                         r = r->skip[PF_SKIP_DIR].ptr;
2533                 else if (r->af && r->af != af)
2534                         r = r->skip[PF_SKIP_AF].ptr;
2535                 else if (r->proto && r->proto != IPPROTO_TCP)
2536                         r = r->skip[PF_SKIP_PROTO].ptr;
2537                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
2538                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
2539                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
2540                     r->src.port[0], r->src.port[1], th->th_sport))
2541                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
2542                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
2543                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2544                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
2545                     r->dst.port[0], r->dst.port[1], th->th_dport))
2546                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2547                 else if (r->tos && !(r->tos & pd->tos))
2548                         r = TAILQ_NEXT(r, entries);
2549                 else if (r->rule_flag & PFRULE_FRAGMENT)
2550                         r = TAILQ_NEXT(r, entries);
2551                 else if ((r->flagset & th->th_flags) != r->flags)
2552                         r = TAILQ_NEXT(r, entries);
2553                 else if (r->uid.op && (lookup != -1 || (lookup =
2554                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2555                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
2556                     uid))
2557                         r = TAILQ_NEXT(r, entries);
2558                 else if (r->gid.op && (lookup != -1 || (lookup =
2559                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2560                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
2561                     gid))
2562                         r = TAILQ_NEXT(r, entries);
2563                 else if (r->prob && r->prob <= karc4random())
2564                         r = TAILQ_NEXT(r, entries);
2565                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
2566                         r = TAILQ_NEXT(r, entries);
2567                 else if (r->anchorname[0] && r->anchor == NULL)
2568                         r = TAILQ_NEXT(r, entries);
2569                 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match(
2570                     pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint))
2571                         r = TAILQ_NEXT(r, entries);
2572                 else {
2573                         if (r->tag)
2574                                 tag = r->tag;
2575                         if (r->anchor == NULL) {
2576                                 *rm = r;
2577                                 *am = a;
2578                                 *rsm = ruleset;
2579                                 if ((*rm)->quick)
2580                                         break;
2581                                 r = TAILQ_NEXT(r, entries);
2582                         } else
2583                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
2584                                     PF_RULESET_FILTER);
2585                 }
2586                 if (r == NULL && a != NULL)
2587                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
2588                             PF_RULESET_FILTER);
2589         }
2590         r = *rm;
2591         a = *am;
2592         ruleset = *rsm;
2593
2594         REASON_SET(&reason, PFRES_MATCH);
2595
2596         if (r->log) {
2597                 if (rewrite)
2598                         m_copyback(m, off, sizeof(*th), (caddr_t)th);
2599                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
2600         }
2601
2602         if ((r->action == PF_DROP) &&
2603             ((r->rule_flag & PFRULE_RETURNRST) ||
2604             (r->rule_flag & PFRULE_RETURNICMP) ||
2605             (r->rule_flag & PFRULE_RETURN))) {
2606                 /* undo NAT changes, if they have taken place */
2607                 if (nr != NULL) {
2608                         if (direction == PF_OUT) {
2609                                 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
2610                                     &th->th_sum, &pd->baddr, bport, 0, af);
2611                                 rewrite++;
2612                         } else {
2613                                 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
2614                                     &th->th_sum, &pd->baddr, bport, 0, af);
2615                                 rewrite++;
2616                         }
2617                 }
2618                 if (((r->rule_flag & PFRULE_RETURNRST) ||
2619                     (r->rule_flag & PFRULE_RETURN)) &&
2620                     !(th->th_flags & TH_RST)) {
2621                         u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
2622
2623                         if (th->th_flags & TH_SYN)
2624                                 ack++;
2625                         if (th->th_flags & TH_FIN)
2626                                 ack++;
2627                         pf_send_tcp(r, af, pd->dst,
2628                             pd->src, th->th_dport, th->th_sport,
2629                             ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
2630                             r->return_ttl);
2631                 } else if ((af == AF_INET) && r->return_icmp)
2632                         pf_send_icmp(m, r->return_icmp >> 8,
2633                             r->return_icmp & 255, af, r);
2634                 else if ((af == AF_INET6) && r->return_icmp6)
2635                         pf_send_icmp(m, r->return_icmp6 >> 8,
2636                             r->return_icmp6 & 255, af, r);
2637         }
2638
2639         if (r->action == PF_DROP)
2640                 return (PF_DROP);
2641
2642         pf_tag_packet(m, tag);
2643
2644         if (r->keep_state || nr != NULL ||
2645             (pd->flags & PFDESC_TCP_NORM)) {
2646                 /* create new state */
2647                 u_int16_t        len;
2648                 struct pf_state *s = NULL;
2649                 struct pf_src_node *sn = NULL;
2650
2651                 len = pd->tot_len - off - (th->th_off << 2);
2652
2653                 /* check maximums */
2654                 if (r->max_states && (r->states >= r->max_states))
2655                         goto cleanup;
2656                 /* src node for flter rule */
2657                 if ((r->rule_flag & PFRULE_SRCTRACK ||
2658                     r->rpool.opts & PF_POOL_STICKYADDR) &&
2659                     pf_insert_src_node(&sn, r, saddr, af) != 0)
2660                         goto cleanup;
2661                 /* src node for translation rule */
2662                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
2663                     ((direction == PF_OUT &&
2664                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
2665                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
2666                         goto cleanup;
2667                 s = pool_get(&pf_state_pl, PR_NOWAIT);
2668                 if (s == NULL) {
2669 cleanup:
2670                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
2671                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
2672                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2673                                 pf_status.src_nodes--;
2674                                 pool_put(&pf_src_tree_pl, sn);
2675                         }
2676                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
2677                             nsn->expire == 0) {
2678                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
2679                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2680                                 pf_status.src_nodes--;
2681                                 pool_put(&pf_src_tree_pl, nsn);
2682                         }
2683                         REASON_SET(&reason, PFRES_MEMORY);
2684                         return (PF_DROP);
2685                 }
2686                 bzero(s, sizeof(*s));
2687                 r->states++;
2688                 if (a != NULL)
2689                         a->states++;
2690                 s->rule.ptr = r;
2691                 s->nat_rule.ptr = nr;
2692                 if (s->nat_rule.ptr != NULL)
2693                         s->nat_rule.ptr->states++;
2694                 s->anchor.ptr = a;
2695                 s->allow_opts = r->allow_opts;
2696                 s->log = r->log & 2;
2697                 s->proto = IPPROTO_TCP;
2698                 s->direction = direction;
2699                 s->af = af;
2700                 if (direction == PF_OUT) {
2701                         PF_ACPY(&s->gwy.addr, saddr, af);
2702                         s->gwy.port = th->th_sport;             /* sport */
2703                         PF_ACPY(&s->ext.addr, daddr, af);
2704                         s->ext.port = th->th_dport;
2705                         if (nr != NULL) {
2706                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
2707                                 s->lan.port = bport;
2708                         } else {
2709                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
2710                                 s->lan.port = s->gwy.port;
2711                         }
2712                 } else {
2713                         PF_ACPY(&s->lan.addr, daddr, af);
2714                         s->lan.port = th->th_dport;
2715                         PF_ACPY(&s->ext.addr, saddr, af);
2716                         s->ext.port = th->th_sport;
2717                         if (nr != NULL) {
2718                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
2719                                 s->gwy.port = bport;
2720                         } else {
2721                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
2722                                 s->gwy.port = s->lan.port;
2723                         }
2724                 }
2725
2726                 s->hash = pf_state_hash(s);
2727                 s->src.seqlo = ntohl(th->th_seq);
2728                 s->src.seqhi = s->src.seqlo + len + 1;
2729                 s->pickup_mode = r->pickup_mode;
2730
2731                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2732                     r->keep_state == PF_STATE_MODULATE) {
2733                         /* Generate sequence number modulator */
2734                         while ((s->src.seqdiff = karc4random()) == 0)
2735                                 ;
2736                         pf_change_a(&th->th_seq, &th->th_sum,
2737                             htonl(s->src.seqlo + s->src.seqdiff), 0);
2738                         rewrite = 1;
2739                 } else
2740                         s->src.seqdiff = 0;
2741
2742                 /*
2743                  * WARNING!  NetBSD patched this to not scale max_win up
2744                  * on the initial SYN, but they failed to correct the code
2745                  * in pf_test_state_tcp() that 'undid' the scaling, and they
2746                  * failed to remove the scale factor on successful window
2747                  * scale negotiation (and doing so would be difficult in the
2748                  * face of retransmission, without adding more flags to the
2749                  * state structure).
2750                  *
2751                  * After discussions with Daniel Hartmeier and Max Laier
2752                  * I've decided not to apply the NetBSD patch.
2753                  *
2754                  * The worst that happens is that the undo code on window
2755                  * scale negotiation failures will produce a larger
2756                  * max_win then actual.
2757                  */
2758                 if (th->th_flags & TH_SYN) {
2759                         s->src.seqhi++;
2760                         s->src.wscale = pf_get_wscale(m, off, th->th_off, af);
2761                         s->sync_flags |= PFSTATE_GOT_SYN1;
2762                 }
2763                 s->src.max_win = MAX(ntohs(th->th_win), 1);
2764                 if (s->src.wscale & PF_WSCALE_MASK) {
2765                         /* Remove scale factor from initial window */
2766                         u_int win = s->src.max_win;
2767                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
2768                         s->src.max_win = (win - 1) >>
2769                             (s->src.wscale & PF_WSCALE_MASK);
2770                 }
2771                 if (th->th_flags & TH_FIN)
2772                         s->src.seqhi++;
2773                 s->dst.seqhi = 1;
2774                 s->dst.max_win = 1;
2775                 s->src.state = TCPS_SYN_SENT;
2776                 s->dst.state = TCPS_CLOSED;
2777                 s->creation = time_second;
2778                 s->expire = time_second;
2779                 s->timeout = PFTM_TCP_FIRST_PACKET;
2780                 pf_set_rt_ifp(s, saddr);
2781                 if (sn != NULL) {
2782                         s->src_node = sn;
2783                         s->src_node->states++;
2784                 }
2785                 if (nsn != NULL) {
2786                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
2787                         s->nat_src_node = nsn;
2788                         s->nat_src_node->states++;
2789                 }
2790                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
2791                     off, pd, th, &s->src, &s->dst)) {
2792                         REASON_SET(&reason, PFRES_MEMORY);
2793                         pf_src_tree_remove_state(s);
2794                         pool_put(&pf_state_pl, s);
2795                         return (PF_DROP);
2796                 }
2797                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
2798                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, &s->src,
2799                     &s->dst, &rewrite)) {
2800                         pf_normalize_tcp_cleanup(s);
2801                         pf_src_tree_remove_state(s);
2802                         pool_put(&pf_state_pl, s);
2803                         return (PF_DROP);
2804                 }
2805                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
2806                         pf_normalize_tcp_cleanup(s);
2807                         REASON_SET(&reason, PFRES_MEMORY);
2808                         pf_src_tree_remove_state(s);
2809                         pool_put(&pf_state_pl, s);
2810                         return (PF_DROP);
2811                 } else
2812                         *sm = s;
2813                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2814                     r->keep_state == PF_STATE_SYNPROXY) {
2815                         u_int16_t mss;
2816
2817                         s->src.state = PF_TCPS_PROXY_SRC;
2818                         if (nr != NULL) {
2819                                 if (direction == PF_OUT) {
2820                                         pf_change_ap(saddr, &th->th_sport,
2821                                             pd->ip_sum, &th->th_sum, &pd->baddr,
2822                                             bport, 0, af);
2823                                 } else {
2824                                         pf_change_ap(daddr, &th->th_dport,
2825                                             pd->ip_sum, &th->th_sum, &pd->baddr,
2826                                             bport, 0, af);
2827                                 }
2828                         }
2829                         s->src.seqhi = karc4random();
2830                         /* Find mss option */
2831                         mss = pf_get_mss(m, off, th->th_off, af);
2832                         mss = pf_calc_mss(saddr, af, mss);
2833                         mss = pf_calc_mss(daddr, af, mss);
2834                         s->src.mss = mss;
2835                         pf_send_tcp(r, af, daddr, saddr, th->th_dport,
2836                             th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
2837                             TH_SYN|TH_ACK, 0, s->src.mss, 0);
2838                         return (PF_SYNPROXY_DROP);
2839                 }
2840         }
2841
2842         /* copy back packet headers if we performed NAT operations */
2843         if (rewrite)
2844                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
2845
2846         return (PF_PASS);
2847 }
2848
2849 int
2850 pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction,
2851     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2852     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
2853 {
2854         struct pf_rule          *nr = NULL;
2855         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
2856         struct udphdr           *uh = pd->hdr.udp;
2857         u_int16_t                bport, nport = 0;
2858         sa_family_t              af = pd->af;
2859         int                      lookup = -1;
2860         uid_t                    uid;
2861         gid_t                    gid;
2862         struct pf_rule          *r, *a = NULL;
2863         struct pf_ruleset       *ruleset = NULL;
2864         struct pf_src_node      *nsn = NULL;
2865         u_short                  reason;
2866         int                      rewrite = 0;
2867         int                      tag = -1;
2868
2869         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2870
2871         if (direction == PF_OUT) {
2872                 bport = nport = uh->uh_sport;
2873                 /* check outgoing packet for BINAT/NAT */
2874                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2875                     saddr, uh->uh_sport, daddr, uh->uh_dport,
2876                     &pd->naddr, &nport)) != NULL) {
2877                         PF_ACPY(&pd->baddr, saddr, af);
2878                         pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2879                             &uh->uh_sum, &pd->naddr, nport, 1, af);
2880                         rewrite++;
2881                         if (nr->natpass)
2882                                 r = NULL;
2883                         pd->nat_rule = nr;
2884                 }
2885         } else {
2886                 bport = nport = uh->uh_dport;
2887                 /* check incoming packet for BINAT/RDR */
2888                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
2889                     saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr,
2890                     &nport)) != NULL) {
2891                         PF_ACPY(&pd->baddr, daddr, af);
2892                         pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2893                             &uh->uh_sum, &pd->naddr, nport, 1, af);
2894                         rewrite++;
2895                         if (nr->natpass)
2896                                 r = NULL;
2897                         pd->nat_rule = nr;
2898                 }
2899         }
2900
2901         while (r != NULL) {
2902                 r->evaluations++;
2903                 if (r->kif != NULL &&
2904                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
2905                         r = r->skip[PF_SKIP_IFP].ptr;
2906                 else if (r->direction && r->direction != direction)
2907                         r = r->skip[PF_SKIP_DIR].ptr;
2908                 else if (r->af && r->af != af)
2909                         r = r->skip[PF_SKIP_AF].ptr;
2910                 else if (r->proto && r->proto != IPPROTO_UDP)
2911                         r = r->skip[PF_SKIP_PROTO].ptr;
2912                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
2913                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
2914                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
2915                     r->src.port[0], r->src.port[1], uh->uh_sport))
2916                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
2917                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
2918                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2919                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
2920                     r->dst.port[0], r->dst.port[1], uh->uh_dport))
2921                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2922                 else if (r->tos && !(r->tos & pd->tos))
2923                         r = TAILQ_NEXT(r, entries);
2924                 else if (r->rule_flag & PFRULE_FRAGMENT)
2925                         r = TAILQ_NEXT(r, entries);
2926                 else if (r->uid.op && (lookup != -1 || (lookup =
2927                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2928                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
2929                     uid))
2930                         r = TAILQ_NEXT(r, entries);
2931                 else if (r->gid.op && (lookup != -1 || (lookup =
2932                     pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2933                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
2934                     gid))
2935                         r = TAILQ_NEXT(r, entries);
2936                 else if (r->prob && r->prob <= karc4random())
2937                         r = TAILQ_NEXT(r, entries);
2938                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
2939                         r = TAILQ_NEXT(r, entries);
2940                 else if (r->anchorname[0] && r->anchor == NULL)
2941                         r = TAILQ_NEXT(r, entries);
2942                 else if (r->os_fingerprint != PF_OSFP_ANY)
2943                         r = TAILQ_NEXT(r, entries);
2944                 else {
2945                         if (r->tag)
2946                                 tag = r->tag;
2947                         if (r->anchor == NULL) {
2948                                 *rm = r;
2949                                 *am = a;
2950                                 *rsm = ruleset;
2951                                 if ((*rm)->quick)
2952                                         break;
2953                                 r = TAILQ_NEXT(r, entries);
2954                         } else
2955                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
2956                                     PF_RULESET_FILTER);
2957                 }
2958                 if (r == NULL && a != NULL)
2959                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
2960                             PF_RULESET_FILTER);
2961         }
2962         r = *rm;
2963         a = *am;
2964         ruleset = *rsm;
2965
2966         REASON_SET(&reason, PFRES_MATCH);
2967
2968         if (r->log) {
2969                 if (rewrite)
2970                         m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
2971                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
2972         }
2973
2974         if ((r->action == PF_DROP) &&
2975             ((r->rule_flag & PFRULE_RETURNICMP) ||
2976             (r->rule_flag & PFRULE_RETURN))) {
2977                 /* undo NAT changes, if they have taken place */
2978                 if (nr != NULL) {
2979                         if (direction == PF_OUT) {
2980                                 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2981                                     &uh->uh_sum, &pd->baddr, bport, 1, af);
2982                                 rewrite++;
2983                         } else {
2984                                 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2985                                     &uh->uh_sum, &pd->baddr, bport, 1, af);
2986                                 rewrite++;
2987                         }
2988                 }
2989                 if ((af == AF_INET) && r->return_icmp)
2990                         pf_send_icmp(m, r->return_icmp >> 8,
2991                             r->return_icmp & 255, af, r);
2992                 else if ((af == AF_INET6) && r->return_icmp6)
2993                         pf_send_icmp(m, r->return_icmp6 >> 8,
2994                             r->return_icmp6 & 255, af, r);
2995         }
2996
2997         if (r->action == PF_DROP)
2998                 return (PF_DROP);
2999
3000         pf_tag_packet(m, tag);
3001
3002         if (r->keep_state || nr != NULL) {
3003                 /* create new state */
3004                 struct pf_state *s = NULL;
3005                 struct pf_src_node *sn = NULL;
3006
3007                 /* check maximums */
3008                 if (r->max_states && (r->states >= r->max_states))
3009                         goto cleanup;
3010                 /* src node for flter rule */
3011                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3012                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3013                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3014                         goto cleanup;
3015                 /* src node for translation rule */
3016                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3017                     ((direction == PF_OUT &&
3018                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3019                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3020                         goto cleanup;
3021                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3022                 if (s == NULL) {
3023 cleanup:
3024                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3025                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3026                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3027                                 pf_status.src_nodes--;
3028                                 pool_put(&pf_src_tree_pl, sn);
3029                         }
3030                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3031                             nsn->expire == 0) {
3032                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3033                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3034                                 pf_status.src_nodes--;
3035                                 pool_put(&pf_src_tree_pl, nsn);
3036                         }
3037                         REASON_SET(&reason, PFRES_MEMORY);
3038                         return (PF_DROP);
3039                 }
3040                 bzero(s, sizeof(*s));
3041                 r->states++;
3042                 if (a != NULL)
3043                         a->states++;
3044                 s->rule.ptr = r;
3045                 s->nat_rule.ptr = nr;
3046                 if (s->nat_rule.ptr != NULL)
3047                         s->nat_rule.ptr->states++;
3048                 s->anchor.ptr = a;
3049                 s->allow_opts = r->allow_opts;
3050                 s->log = r->log & 2;
3051                 s->proto = IPPROTO_UDP;
3052                 s->direction = direction;
3053                 s->af = af;
3054                 if (direction == PF_OUT) {
3055                         PF_ACPY(&s->gwy.addr, saddr, af);
3056                         s->gwy.port = uh->uh_sport;
3057                         PF_ACPY(&s->ext.addr, daddr, af);
3058                         s->ext.port = uh->uh_dport;
3059                         if (nr != NULL) {
3060                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3061                                 s->lan.port = bport;
3062                         } else {
3063                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3064                                 s->lan.port = s->gwy.port;
3065                         }
3066                 } else {
3067                         PF_ACPY(&s->lan.addr, daddr, af);
3068                         s->lan.port = uh->uh_dport;
3069                         PF_ACPY(&s->ext.addr, saddr, af);
3070                         s->ext.port = uh->uh_sport;
3071                         if (nr != NULL) {
3072                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3073                                 s->gwy.port = bport;
3074                         } else {
3075                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3076                                 s->gwy.port = s->lan.port;
3077                         }
3078                 }
3079                 s->hash = pf_state_hash(s);
3080                 s->src.state = PFUDPS_SINGLE;
3081                 s->dst.state = PFUDPS_NO_TRAFFIC;
3082                 s->creation = time_second;
3083                 s->expire = time_second;
3084                 s->timeout = PFTM_UDP_FIRST_PACKET;
3085                 pf_set_rt_ifp(s, saddr);
3086                 if (sn != NULL) {
3087                         s->src_node = sn;
3088                         s->src_node->states++;
3089                 }
3090                 if (nsn != NULL) {
3091                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3092                         s->nat_src_node = nsn;
3093                         s->nat_src_node->states++;
3094                 }
3095                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3096                         REASON_SET(&reason, PFRES_MEMORY);
3097                         pf_src_tree_remove_state(s);
3098                         pool_put(&pf_state_pl, s);
3099                         return (PF_DROP);
3100                 } else
3101                         *sm = s;
3102         }
3103
3104         /* copy back packet headers if we performed NAT operations */
3105         if (rewrite)
3106                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
3107
3108         return (PF_PASS);
3109 }
3110
3111 int
3112 pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction,
3113     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3114     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
3115 {
3116         struct pf_rule          *nr = NULL;
3117         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3118         struct pf_rule          *r, *a = NULL;
3119         struct pf_ruleset       *ruleset = NULL;
3120         struct pf_src_node      *nsn = NULL;
3121         u_short                  reason;
3122         u_int16_t                icmpid = 0;
3123         sa_family_t              af = pd->af;
3124         u_int8_t                 icmptype = 0, icmpcode = 0;
3125         int                      state_icmp = 0;
3126         int                      tag = -1;
3127 #ifdef INET6
3128         int                      rewrite = 0;
3129 #endif /* INET6 */
3130
3131         switch (pd->proto) {
3132 #ifdef INET
3133         case IPPROTO_ICMP:
3134                 icmptype = pd->hdr.icmp->icmp_type;
3135                 icmpcode = pd->hdr.icmp->icmp_code;
3136                 icmpid = pd->hdr.icmp->icmp_id;
3137
3138                 if (icmptype == ICMP_UNREACH ||
3139                     icmptype == ICMP_SOURCEQUENCH ||
3140                     icmptype == ICMP_REDIRECT ||
3141                     icmptype == ICMP_TIMXCEED ||
3142                     icmptype == ICMP_PARAMPROB)
3143                         state_icmp++;
3144                 break;
3145 #endif /* INET */
3146 #ifdef INET6
3147         case IPPROTO_ICMPV6:
3148                 icmptype = pd->hdr.icmp6->icmp6_type;
3149                 icmpcode = pd->hdr.icmp6->icmp6_code;
3150                 icmpid = pd->hdr.icmp6->icmp6_id;
3151
3152                 if (icmptype == ICMP6_DST_UNREACH ||
3153                     icmptype == ICMP6_PACKET_TOO_BIG ||
3154                     icmptype == ICMP6_TIME_EXCEEDED ||
3155                     icmptype == ICMP6_PARAM_PROB)
3156                         state_icmp++;
3157                 break;
3158 #endif /* INET6 */
3159         }
3160
3161         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3162
3163         if (direction == PF_OUT) {
3164                 /* check outgoing packet for BINAT/NAT */
3165                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3166                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3167                         PF_ACPY(&pd->baddr, saddr, af);
3168                         switch (af) {
3169 #ifdef INET
3170                         case AF_INET:
3171                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3172                                     pd->naddr.v4.s_addr, 0);
3173                                 break;
3174 #endif /* INET */
3175 #ifdef INET6
3176                         case AF_INET6:
3177                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3178                                     &pd->naddr, 0);
3179                                 rewrite++;
3180                                 break;
3181 #endif /* INET6 */
3182                         }
3183                         if (nr->natpass)
3184                                 r = NULL;
3185                         pd->nat_rule = nr;
3186                 }
3187         } else {
3188                 /* check incoming packet for BINAT/RDR */
3189                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3190                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3191                         PF_ACPY(&pd->baddr, daddr, af);
3192                         switch (af) {
3193 #ifdef INET
3194                         case AF_INET:
3195                                 pf_change_a(&daddr->v4.s_addr,
3196                                     pd->ip_sum, pd->naddr.v4.s_addr, 0);
3197                                 break;
3198 #endif /* INET */
3199 #ifdef INET6
3200                         case AF_INET6:
3201                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3202                                     &pd->naddr, 0);
3203                                 rewrite++;
3204                                 break;
3205 #endif /* INET6 */
3206                         }
3207                         if (nr->natpass)
3208                                 r = NULL;
3209                         pd->nat_rule = nr;
3210                 }
3211         }
3212
3213         while (r != NULL) {
3214                 r->evaluations++;
3215                 if (r->kif != NULL &&
3216                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3217                         r = r->skip[PF_SKIP_IFP].ptr;
3218                 else if (r->direction && r->direction != direction)
3219                         r = r->skip[PF_SKIP_DIR].ptr;
3220                 else if (r->af && r->af != af)
3221                         r = r->skip[PF_SKIP_AF].ptr;
3222                 else if (r->proto && r->proto != pd->proto)
3223                         r = r->skip[PF_SKIP_PROTO].ptr;
3224                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
3225                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3226                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
3227                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3228                 else if (r->type && r->type != icmptype + 1)
3229                         r = TAILQ_NEXT(r, entries);
3230                 else if (r->code && r->code != icmpcode + 1)
3231                         r = TAILQ_NEXT(r, entries);
3232                 else if (r->tos && !(r->tos & pd->tos))
3233                         r = TAILQ_NEXT(r, entries);
3234                 else if (r->rule_flag & PFRULE_FRAGMENT)
3235                         r = TAILQ_NEXT(r, entries);
3236                 else if (r->prob && r->prob <= karc4random())
3237                         r = TAILQ_NEXT(r, entries);
3238                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3239                         r = TAILQ_NEXT(r, entries);
3240                 else if (r->anchorname[0] && r->anchor == NULL)
3241                         r = TAILQ_NEXT(r, entries);
3242                 else if (r->os_fingerprint != PF_OSFP_ANY)
3243                         r = TAILQ_NEXT(r, entries);
3244                 else {
3245                         if (r->tag)
3246                                 tag = r->tag;
3247                         if (r->anchor == NULL) {
3248                                 *rm = r;
3249                                 *am = a;
3250                                 *rsm = ruleset;
3251                                 if ((*rm)->quick)
3252                                         break;
3253                                 r = TAILQ_NEXT(r, entries);
3254                         } else
3255                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3256                                     PF_RULESET_FILTER);
3257                 }
3258                 if (r == NULL && a != NULL)
3259                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3260                             PF_RULESET_FILTER);
3261         }
3262         r = *rm;
3263         a = *am;
3264         ruleset = *rsm;
3265
3266         REASON_SET(&reason, PFRES_MATCH);
3267
3268         if (r->log) {
3269 #ifdef INET6
3270                 if (rewrite)
3271                         m_copyback(m, off, sizeof(struct icmp6_hdr),
3272                             (caddr_t)pd->hdr.icmp6);
3273 #endif /* INET6 */
3274                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3275         }
3276
3277         if (r->action != PF_PASS)
3278                 return (PF_DROP);
3279
3280         pf_tag_packet(m, tag);
3281
3282         if (!state_icmp && (r->keep_state || nr != NULL)) {
3283                 /* create new state */
3284                 struct pf_state *s = NULL;
3285                 struct pf_src_node *sn = NULL;
3286
3287                 /* check maximums */
3288                 if (r->max_states && (r->states >= r->max_states))
3289                         goto cleanup;
3290                 /* src node for flter rule */
3291                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3292                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3293                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3294                         goto cleanup;
3295                 /* src node for translation rule */
3296                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3297                     ((direction == PF_OUT &&
3298                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3299                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3300                         goto cleanup;
3301                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3302                 if (s == NULL) {
3303 cleanup:
3304                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3305                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3306                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3307                                 pf_status.src_nodes--;
3308                                 pool_put(&pf_src_tree_pl, sn);
3309                         }
3310                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3311                             nsn->expire == 0) {
3312                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3313                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3314                                 pf_status.src_nodes--;
3315                                 pool_put(&pf_src_tree_pl, nsn);
3316                         }
3317                         REASON_SET(&reason, PFRES_MEMORY);
3318                         return (PF_DROP);
3319                 }
3320                 bzero(s, sizeof(*s));
3321                 r->states++;
3322                 if (a != NULL)
3323                         a->states++;
3324                 s->rule.ptr = r;
3325                 s->nat_rule.ptr = nr;
3326                 if (s->nat_rule.ptr != NULL)
3327                         s->nat_rule.ptr->states++;
3328                 s->anchor.ptr = a;
3329                 s->allow_opts = r->allow_opts;
3330                 s->log = r->log & 2;
3331                 s->proto = pd->proto;
3332                 s->direction = direction;
3333                 s->af = af;
3334                 if (direction == PF_OUT) {
3335                         PF_ACPY(&s->gwy.addr, saddr, af);
3336                         s->gwy.port = icmpid;
3337                         PF_ACPY(&s->ext.addr, daddr, af);
3338                         s->ext.port = icmpid;
3339                         if (nr != NULL)
3340                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3341                         else
3342                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3343                         s->lan.port = icmpid;
3344                 } else {
3345                         PF_ACPY(&s->lan.addr, daddr, af);
3346                         s->lan.port = icmpid;
3347                         PF_ACPY(&s->ext.addr, saddr, af);
3348                         s->ext.port = icmpid;
3349                         if (nr != NULL)
3350                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3351                         else
3352                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3353                         s->gwy.port = icmpid;
3354                 }
3355                 s->hash = pf_state_hash(s);
3356                 s->creation = time_second;
3357                 s->expire = time_second;
3358                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3359                 pf_set_rt_ifp(s, saddr);
3360                 if (sn != NULL) {
3361                         s->src_node = sn;
3362                         s->src_node->states++;
3363                 }
3364                 if (nsn != NULL) {
3365                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3366                         s->nat_src_node = nsn;
3367                         s->nat_src_node->states++;
3368                 }
3369                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3370                         REASON_SET(&reason, PFRES_MEMORY);
3371                         pf_src_tree_remove_state(s);
3372                         pool_put(&pf_state_pl, s);
3373                         return (PF_DROP);
3374                 } else
3375                         *sm = s;
3376         }
3377
3378 #ifdef INET6
3379         /* copy back packet headers if we performed IPv6 NAT operations */
3380         if (rewrite)
3381                 m_copyback(m, off, sizeof(struct icmp6_hdr),
3382                     (caddr_t)pd->hdr.icmp6);
3383 #endif /* INET6 */
3384
3385         return (PF_PASS);
3386 }
3387
3388 int
3389 pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction,
3390     struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3391     struct pf_rule **am, struct pf_ruleset **rsm)
3392 {
3393         struct pf_rule          *nr = NULL;
3394         struct pf_rule          *r, *a = NULL;
3395         struct pf_ruleset       *ruleset = NULL;
3396         struct pf_src_node      *nsn = NULL;
3397         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3398         sa_family_t              af = pd->af;
3399         u_short                  reason;
3400         int                      tag = -1;
3401
3402         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3403
3404         if (direction == PF_OUT) {
3405                 /* check outgoing packet for BINAT/NAT */
3406                 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3407                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3408                         PF_ACPY(&pd->baddr, saddr, af);
3409                         switch (af) {
3410 #ifdef INET
3411                         case AF_INET:
3412                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3413                                     pd->naddr.v4.s_addr, 0);
3414                                 break;
3415 #endif /* INET */
3416 #ifdef INET6
3417                         case AF_INET6:
3418                                 PF_ACPY(saddr, &pd->naddr, af);
3419                                 break;
3420 #endif /* INET6 */
3421                         }
3422                         if (nr->natpass)
3423                                 r = NULL;
3424                         pd->nat_rule = nr;
3425                 }
3426         } else {
3427                 /* check incoming packet for BINAT/RDR */
3428                 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3429                     saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3430                         PF_ACPY(&pd->baddr, daddr, af);
3431                         switch (af) {
3432 #ifdef INET
3433                         case AF_INET:
3434                                 pf_change_a(&daddr->v4.s_addr,
3435                                     pd->ip_sum, pd->naddr.v4.s_addr, 0);
3436                                 break;
3437 #endif /* INET */
3438 #ifdef INET6
3439                         case AF_INET6:
3440                                 PF_ACPY(daddr, &pd->naddr, af);
3441                                 break;
3442 #endif /* INET6 */
3443                         }
3444                         if (nr->natpass)
3445                                 r = NULL;
3446                         pd->nat_rule = nr;
3447                 }
3448         }
3449
3450         while (r != NULL) {
3451                 r->evaluations++;
3452                 if (r->kif != NULL &&
3453                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3454                         r = r->skip[PF_SKIP_IFP].ptr;
3455                 else if (r->direction && r->direction != direction)
3456                         r = r->skip[PF_SKIP_DIR].ptr;
3457                 else if (r->af && r->af != af)
3458                         r = r->skip[PF_SKIP_AF].ptr;
3459                 else if (r->proto && r->proto != pd->proto)
3460                         r = r->skip[PF_SKIP_PROTO].ptr;
3461                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3462                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3463                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3464                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3465                 else if (r->tos && !(r->tos & pd->tos))
3466                         r = TAILQ_NEXT(r, entries);
3467                 else if (r->rule_flag & PFRULE_FRAGMENT)
3468                         r = TAILQ_NEXT(r, entries);
3469                 else if (r->prob && r->prob <= karc4random())
3470                         r = TAILQ_NEXT(r, entries);
3471                 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3472                         r = TAILQ_NEXT(r, entries);
3473                 else if (r->anchorname[0] && r->anchor == NULL)
3474                         r = TAILQ_NEXT(r, entries);
3475                 else if (r->os_fingerprint != PF_OSFP_ANY)
3476                         r = TAILQ_NEXT(r, entries);
3477                 else {
3478                         if (r->tag)
3479                                 tag = r->tag;
3480                         if (r->anchor == NULL) {
3481                                 *rm = r;
3482                                 *am = a;
3483                                 *rsm = ruleset;
3484                                 if ((*rm)->quick)
3485                                         break;
3486                                 r = TAILQ_NEXT(r, entries);
3487                         } else
3488                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3489                                     PF_RULESET_FILTER);
3490                 }
3491                 if (r == NULL && a != NULL)
3492                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3493                             PF_RULESET_FILTER);
3494         }
3495         r = *rm;
3496         a = *am;
3497         ruleset = *rsm;
3498
3499         REASON_SET(&reason, PFRES_MATCH);
3500
3501         if (r->log)
3502                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3503
3504         if ((r->action == PF_DROP) &&
3505             ((r->rule_flag & PFRULE_RETURNICMP) ||
3506             (r->rule_flag & PFRULE_RETURN))) {
3507                 struct pf_addr *a = NULL;
3508
3509                 if (nr != NULL) {
3510                         if (direction == PF_OUT)
3511                                 a = saddr;
3512                         else
3513                                 a = daddr;
3514                 }
3515                 if (a != NULL) {
3516                         switch (af) {
3517 #ifdef INET
3518                         case AF_INET:
3519                                 pf_change_a(&a->v4.s_addr, pd->ip_sum,
3520                                     pd->baddr.v4.s_addr, 0);
3521                                 break;
3522 #endif /* INET */
3523 #ifdef INET6
3524                         case AF_INET6:
3525                                 PF_ACPY(a, &pd->baddr, af);
3526                                 break;
3527 #endif /* INET6 */
3528                         }
3529                 }
3530                 if ((af == AF_INET) && r->return_icmp)
3531                         pf_send_icmp(m, r->return_icmp >> 8,
3532                             r->return_icmp & 255, af, r);
3533                 else if ((af == AF_INET6) && r->return_icmp6)
3534                         pf_send_icmp(m, r->return_icmp6 >> 8,
3535                             r->return_icmp6 & 255, af, r);
3536         }
3537
3538         if (r->action != PF_PASS)
3539                 return (PF_DROP);
3540
3541         pf_tag_packet(m, tag);
3542
3543         if (r->keep_state || nr != NULL) {
3544                 /* create new state */
3545                 struct pf_state *s = NULL;
3546                 struct pf_src_node *sn = NULL;
3547
3548                 /* check maximums */
3549                 if (r->max_states && (r->states >= r->max_states))
3550                         goto cleanup;
3551                 /* src node for flter rule */
3552                 if ((r->rule_flag & PFRULE_SRCTRACK ||
3553                     r->rpool.opts & PF_POOL_STICKYADDR) &&
3554                     pf_insert_src_node(&sn, r, saddr, af) != 0)
3555                         goto cleanup;
3556                 /* src node for translation rule */
3557                 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3558                     ((direction == PF_OUT &&
3559                     pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3560                     (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3561                         goto cleanup;
3562                 s = pool_get(&pf_state_pl, PR_NOWAIT);
3563                 if (s == NULL) {
3564 cleanup:
3565                         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3566                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3567                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3568                                 pf_status.src_nodes--;
3569                                 pool_put(&pf_src_tree_pl, sn);
3570                         }
3571                         if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3572                             nsn->expire == 0) {
3573                                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3574                                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3575                                 pf_status.src_nodes--;
3576                                 pool_put(&pf_src_tree_pl, nsn);
3577                         }
3578                         REASON_SET(&reason, PFRES_MEMORY);
3579                         return (PF_DROP);
3580                 }
3581                 bzero(s, sizeof(*s));
3582                 r->states++;
3583                 if (a != NULL)
3584                         a->states++;
3585                 s->rule.ptr = r;
3586                 s->nat_rule.ptr = nr;
3587                 if (s->nat_rule.ptr != NULL)
3588                         s->nat_rule.ptr->states++;
3589                 s->anchor.ptr = a;
3590                 s->allow_opts = r->allow_opts;
3591                 s->log = r->log & 2;
3592                 s->proto = pd->proto;
3593                 s->direction = direction;
3594                 s->af = af;
3595                 if (direction == PF_OUT) {
3596                         PF_ACPY(&s->gwy.addr, saddr, af);
3597                         PF_ACPY(&s->ext.addr, daddr, af);
3598                         if (nr != NULL)
3599                                 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3600                         else
3601                                 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3602                 } else {
3603                         PF_ACPY(&s->lan.addr, daddr, af);
3604                         PF_ACPY(&s->ext.addr, saddr, af);
3605                         if (nr != NULL)
3606                                 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3607                         else
3608                                 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3609                 }
3610                 s->hash = pf_state_hash(s);
3611                 s->src.state = PFOTHERS_SINGLE;
3612                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3613                 s->creation = time_second;
3614                 s->expire = time_second;
3615                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3616                 pf_set_rt_ifp(s, saddr);
3617                 if (sn != NULL) {
3618                         s->src_node = sn;
3619                         s->src_node->states++;
3620                 }
3621                 if (nsn != NULL) {
3622                         PF_ACPY(&nsn->raddr, &pd->naddr, af);
3623                         s->nat_src_node = nsn;
3624                         s->nat_src_node->states++;
3625                 }
3626                 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3627                         REASON_SET(&reason, PFRES_MEMORY);
3628                         pf_src_tree_remove_state(s);
3629                         pool_put(&pf_state_pl, s);
3630                         return (PF_DROP);
3631                 } else
3632                         *sm = s;
3633         }
3634
3635         return (PF_PASS);
3636 }
3637
3638 int
3639 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3640     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3641     struct pf_ruleset **rsm)
3642 {
3643         struct pf_rule          *r, *a = NULL;
3644         struct pf_ruleset       *ruleset = NULL;
3645         sa_family_t              af = pd->af;
3646         u_short                  reason;
3647         int                      tag = -1;
3648
3649         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3650         while (r != NULL) {
3651                 r->evaluations++;
3652                 if (r->kif != NULL &&
3653                     (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3654                         r = r->skip[PF_SKIP_IFP].ptr;
3655                 else if (r->direction && r->direction != direction)
3656                         r = r->skip[PF_SKIP_DIR].ptr;
3657                 else if (r->af && r->af != af)
3658                         r = r->skip[PF_SKIP_AF].ptr;
3659                 else if (r->proto && r->proto != pd->proto)
3660                         r = r->skip[PF_SKIP_PROTO].ptr;
3661                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3662                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3663                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3664                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3665                 else if (r->tos && !(r->tos & pd->tos))
3666                         r = TAILQ_NEXT(r, entries);
3667                 else if (r->os_fingerprint != PF_OSFP_ANY)
3668                         r = TAILQ_NEXT(r, entries);
3669                 else if (pd->proto == IPPROTO_UDP &&
3670                     (r->src.port_op || r->dst.port_op))
3671                         r = TAILQ_NEXT(r, entries);
3672                 else if (pd->proto == IPPROTO_TCP &&
3673                     (r->src.port_op || r->dst.port_op || r->flagset))
3674                         r = TAILQ_NEXT(r, entries);
3675                 else if ((pd->proto == IPPROTO_ICMP ||
3676                     pd->proto == IPPROTO_ICMPV6) &&
3677                     (r->type || r->code))
3678                         r = TAILQ_NEXT(r, entries);
3679                 else if (r->prob && r->prob <= karc4random())
3680                         r = TAILQ_NEXT(r, entries);
3681                 else if (r->match_tag && !pf_match_tag(m, r, NULL, &tag))
3682                         r = TAILQ_NEXT(r, entries);
3683                 else if (r->anchorname[0] && r->anchor == NULL)
3684                         r = TAILQ_NEXT(r, entries);
3685                 else {
3686                         if (r->anchor == NULL) {
3687                                 *rm = r;
3688                                 *am = a;
3689                                 *rsm = ruleset;
3690                                 if ((*rm)->quick)
3691                                         break;
3692                                 r = TAILQ_NEXT(r, entries);
3693                         } else
3694                                 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3695                                     PF_RULESET_FILTER);
3696                 }
3697                 if (r == NULL && a != NULL)
3698                         PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3699                             PF_RULESET_FILTER);
3700         }
3701         r = *rm;
3702         a = *am;
3703         ruleset = *rsm;
3704
3705         REASON_SET(&reason, PFRES_MATCH);
3706
3707         if (r->log)
3708                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3709
3710         if (r->action != PF_PASS)
3711                 return (PF_DROP);
3712
3713         pf_tag_packet(m, tag);
3714
3715         return (PF_PASS);
3716 }
3717
3718 int
3719 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
3720     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3721     u_short *reason)
3722 {
3723         struct pf_state          key;
3724         struct tcphdr           *th = pd->hdr.tcp;
3725         u_int16_t                win = ntohs(th->th_win);
3726         u_int32_t                ack, end, seq;
3727         u_int8_t                 sws, dws;
3728         int                      ackskew;
3729         int                      copyback = 0;
3730         struct pf_state_peer    *src, *dst;
3731
3732         key.af = pd->af;
3733         key.proto = IPPROTO_TCP;
3734         if (direction == PF_IN) {
3735                 PF_ACPY(&key.ext.addr, pd->src, key.af);
3736                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
3737                 key.ext.port = th->th_sport;
3738                 key.gwy.port = th->th_dport;
3739         } else {
3740                 PF_ACPY(&key.lan.addr, pd->src, key.af);
3741                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
3742                 key.lan.port = th->th_sport;
3743                 key.ext.port = th->th_dport;
3744         }
3745
3746         STATE_LOOKUP();
3747
3748         if (direction == (*state)->direction) {
3749                 src = &(*state)->src;
3750                 dst = &(*state)->dst;
3751         } else {
3752                 src = &(*state)->dst;
3753                 dst = &(*state)->src;
3754         }
3755
3756         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
3757                 if (direction != (*state)->direction)
3758                         return (PF_SYNPROXY_DROP);
3759                 if (th->th_flags & TH_SYN) {
3760                         if (ntohl(th->th_seq) != (*state)->src.seqlo)
3761                                 return (PF_DROP);
3762                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3763                             pd->src, th->th_dport, th->th_sport,
3764                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
3765                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0);
3766                         return (PF_SYNPROXY_DROP);
3767                 } else if (!(th->th_flags & TH_ACK) ||
3768                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3769                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3770                         return (PF_DROP);
3771                 else
3772                         (*state)->src.state = PF_TCPS_PROXY_DST;
3773         }
3774         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
3775                 struct pf_state_host *src, *dst;
3776
3777                 if (direction == PF_OUT) {
3778                         src = &(*state)->gwy;
3779                         dst = &(*state)->ext;
3780                 } else {
3781                         src = &(*state)->ext;
3782                         dst = &(*state)->lan;
3783                 }
3784                 if (direction == (*state)->direction) {
3785                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
3786                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3787                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3788                                 return (PF_DROP);
3789                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
3790                         if ((*state)->dst.seqhi == 1)
3791                                 (*state)->dst.seqhi = karc4random();
3792                         pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3793                             &dst->addr, src->port, dst->port,
3794                             (*state)->dst.seqhi, 0, TH_SYN, 0,
3795                             (*state)->src.mss, 0);
3796                         return (PF_SYNPROXY_DROP);
3797                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
3798                     (TH_SYN|TH_ACK)) ||
3799                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1))
3800                         return (PF_DROP);
3801                 else {
3802                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
3803                         (*state)->dst.seqlo = ntohl(th->th_seq);
3804                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3805                             pd->src, th->th_dport, th->th_sport,
3806                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
3807                             TH_ACK, (*state)->src.max_win, 0, 0);
3808                         pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3809                             &dst->addr, src->port, dst->port,
3810                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
3811                             TH_ACK, (*state)->dst.max_win, 0, 0);
3812                         (*state)->src.seqdiff = (*state)->dst.seqhi -
3813                             (*state)->src.seqlo;
3814                         (*state)->dst.seqdiff = (*state)->src.seqhi -
3815                             (*state)->dst.seqlo;
3816                         (*state)->src.seqhi = (*state)->src.seqlo +
3817                             (*state)->dst.max_win;
3818                         (*state)->dst.seqhi = (*state)->dst.seqlo +
3819                             (*state)->src.max_win;
3820                         (*state)->src.wscale = (*state)->dst.wscale = 0;
3821                         (*state)->src.state = (*state)->dst.state =
3822                             TCPS_ESTABLISHED;
3823                         return (PF_SYNPROXY_DROP);
3824                 }
3825         }
3826
3827         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3828                 sws = src->wscale & PF_WSCALE_MASK;
3829                 dws = dst->wscale & PF_WSCALE_MASK;
3830         } else
3831                 sws = dws = 0;
3832
3833         /*
3834          * Sequence tracking algorithm from Guido van Rooij's paper:
3835          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3836          *      tcp_filtering.ps
3837          */
3838
3839         seq = ntohl(th->th_seq);
3840         if (src->seqlo == 0) {
3841                 /*
3842                  * First packet from this end.  The other end has already set
3843                  * the seqlo field.  Set its state.
3844                  */
3845                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3846                     src->scrub == NULL) {
3847                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3848                                 REASON_SET(reason, PFRES_MEMORY);
3849                                 return (PF_DROP);
3850                         }
3851                 }
3852
3853                 /* Deferred generation of sequence number modulator */
3854                 if (dst->seqdiff && !src->seqdiff) {
3855                         while ((src->seqdiff = karc4random()) == 0)
3856                                 ;
3857                         ack = ntohl(th->th_ack) - dst->seqdiff;
3858                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3859                             src->seqdiff), 0);
3860                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3861                         copyback = 1;
3862                 } else {
3863                         ack = ntohl(th->th_ack);
3864                 }
3865
3866                 end = seq + pd->p_len;
3867                 if (th->th_flags & TH_SYN) {
3868                         end++;
3869                         (*state)->sync_flags |= PFSTATE_GOT_SYN2;
3870                         if (dst->wscale & PF_WSCALE_FLAG) {
3871                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3872                                     pd->af);
3873                                 if (src->wscale & PF_WSCALE_FLAG) {
3874                                         /* Remove scale factor from initial
3875                                          * window */
3876                                         sws = src->wscale & PF_WSCALE_MASK;
3877                                         win = ((u_int32_t)win + (1 << sws) - 1)
3878                                             >> sws;
3879                                         dws = dst->wscale & PF_WSCALE_MASK;
3880                                 } else {
3881                                         /*
3882                                          * Fixup other window.  Undo the
3883                                          * normalization that was done on
3884                                          * the initial SYN.  This can result
3885                                          * in max_win being larger then
3886                                          * actual but we don't really have
3887                                          * much of a choice.
3888                                          */
3889                                         dst->max_win <<= dst->wscale &
3890                                             PF_WSCALE_MASK;
3891                                         /* in case of a retrans SYN|ACK */
3892                                         dst->wscale = 0;
3893                                 }
3894                         }
3895                 }
3896                 if (th->th_flags & TH_FIN)
3897                         end++;
3898
3899                 src->seqlo = seq;
3900                 if (src->state < TCPS_SYN_SENT)
3901                         src->state = TCPS_SYN_SENT;
3902
3903                 /*
3904                  * May need to slide the window (seqhi may have been set by
3905                  * the crappy stack check or if we picked up the connection
3906                  * after establishment)
3907                  */
3908                 if (src->seqhi == 1 ||
3909                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3910                         src->seqhi = end + MAX(1, dst->max_win << dws);
3911                 if (win > src->max_win)
3912                         src->max_win = win;
3913
3914         } else {
3915                 ack = ntohl(th->th_ack) - dst->seqdiff;
3916                 if (src->seqdiff) {
3917                         /* Modulate sequence numbers */
3918                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3919                             src->seqdiff), 0);
3920                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3921                         copyback = 1;
3922                 }
3923                 end = seq + pd->p_len;
3924                 if (th->th_flags & TH_SYN)
3925                         end++;
3926                 if (th->th_flags & TH_FIN)
3927                         end++;
3928         }
3929
3930         if ((th->th_flags & TH_ACK) == 0) {
3931                 /* Let it pass through the ack skew check */
3932                 ack = dst->seqlo;
3933         } else if ((ack == 0 &&
3934             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3935             /* broken tcp stacks do not set ack */
3936             (dst->state < TCPS_SYN_SENT)) {
3937                 /*
3938                  * Many stacks (ours included) will set the ACK number in an
3939                  * FIN|ACK if the SYN times out -- no sequence to ACK.
3940                  */
3941                 ack = dst->seqlo;
3942         }
3943
3944         if (seq == end) {
3945                 /* Ease sequencing restrictions on no data packets */
3946                 seq = src->seqlo;
3947                 end = seq;
3948         }
3949
3950         ackskew = dst->seqlo - ack;
3951
3952 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
3953
3954         if (SEQ_GEQ(src->seqhi, end) &&
3955             /* Last octet inside other's window space */
3956             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
3957             /* Retrans: not more than one window back */
3958             (ackskew >= -MAXACKWINDOW) &&
3959             /* Acking not more than one reassembled fragment backwards */
3960             (ackskew <= (MAXACKWINDOW << sws))) {
3961             /* Acking not more than one window forward */
3962
3963                 /* update max window */
3964                 if (src->max_win < win)
3965                         src->max_win = win;
3966                 /* synchronize sequencing */
3967                 if (SEQ_GT(end, src->seqlo))
3968                         src->seqlo = end;
3969                 /* slide the window of what the other end can send */
3970                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
3971                         dst->seqhi = ack + MAX((win << sws), 1);
3972
3973
3974                 /* update states */
3975                 if (th->th_flags & TH_SYN)
3976                         if (src->state < TCPS_SYN_SENT)
3977                                 src->state = TCPS_SYN_SENT;
3978                 if (th->th_flags & TH_FIN)
3979                         if (src->state < TCPS_CLOSING)
3980                                 src->state = TCPS_CLOSING;
3981                 if (th->th_flags & TH_ACK) {
3982                         if (dst->state == TCPS_SYN_SENT)
3983                                 dst->state = TCPS_ESTABLISHED;
3984                         else if (dst->state == TCPS_CLOSING)
3985                                 dst->state = TCPS_FIN_WAIT_2;
3986                 }
3987                 if (th->th_flags & TH_RST)
3988                         src->state = dst->state = TCPS_TIME_WAIT;
3989
3990                 /* update expire time */
3991                 (*state)->expire = time_second;
3992                 if (src->state >= TCPS_FIN_WAIT_2 &&
3993                     dst->state >= TCPS_FIN_WAIT_2)
3994                         (*state)->timeout = PFTM_TCP_CLOSED;
3995                 else if (src->state >= TCPS_FIN_WAIT_2 ||
3996                     dst->state >= TCPS_FIN_WAIT_2)
3997                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
3998                 else if (src->state < TCPS_ESTABLISHED ||
3999                     dst->state < TCPS_ESTABLISHED)
4000                         (*state)->timeout = PFTM_TCP_OPENING;
4001                 else if (src->state >= TCPS_CLOSING ||
4002                     dst->state >= TCPS_CLOSING)
4003                         (*state)->timeout = PFTM_TCP_CLOSING;
4004                 else
4005                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4006
4007                 /* Fall through to PASS packet */
4008
4009         } else if ((dst->state < TCPS_SYN_SENT ||
4010                 dst->state >= TCPS_FIN_WAIT_2 ||
4011                 src->state >= TCPS_FIN_WAIT_2) &&
4012             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4013             /* Within a window forward of the originating packet */
4014             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4015             /* Within a window backward of the originating packet */
4016
4017                 /*
4018                  * This currently handles three situations:
4019                  *  1) Stupid stacks will shotgun SYNs before their peer
4020                  *     replies.
4021                  *  2) When PF catches an already established stream (the
4022                  *     firewall rebooted, the state table was flushed, routes
4023                  *     changed...)
4024                  *  3) Packets get funky immediately after the connection
4025                  *     closes (this should catch Solaris spurious ACK|FINs
4026                  *     that web servers like to spew after a close)
4027                  *
4028                  * This must be a little more careful than the above code
4029                  * since packet floods will also be caught here. We don't
4030                  * update the TTL here to mitigate the damage of a packet
4031                  * flood and so the same code can handle awkward establishment
4032                  * and a loosened connection close.
4033                  * In the establishment case, a correct peer response will
4034                  * validate the connection, go through the normal state code
4035                  * and keep updating the state TTL.
4036                  */
4037
4038                 if (pf_status.debug >= PF_DEBUG_MISC) {
4039                         kprintf("pf: loose state match: ");
4040                         pf_print_state(*state);
4041                         pf_print_flags(th->th_flags);
4042                         kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n",
4043                             seq, ack, pd->p_len, ackskew,
4044                             (*state)->packets[0], (*state)->packets[1]);
4045                 }
4046
4047                 /* update max window */
4048                 if (src->max_win < win)
4049                         src->max_win = win;
4050                 /* synchronize sequencing */
4051                 if (SEQ_GT(end, src->seqlo))
4052                         src->seqlo = end;
4053                 /* slide the window of what the other end can send */
4054                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4055                         dst->seqhi = ack + MAX((win << sws), 1);
4056
4057                 /*
4058                  * Cannot set dst->seqhi here since this could be a shotgunned
4059                  * SYN and not an already established connection.
4060                  */
4061
4062                 if (th->th_flags & TH_FIN)
4063                         if (src->state < TCPS_CLOSING)
4064                                 src->state = TCPS_CLOSING;
4065                 if (th->th_flags & TH_RST)
4066                         src->state = dst->state = TCPS_TIME_WAIT;
4067
4068                 /* Fall through to PASS packet */
4069
4070         } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY ||
4071                     ((*state)->pickup_mode == PF_PICKUPS_ENABLED &&
4072                      ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) !=
4073                       PFSTATE_GOT_SYN_MASK)) {
4074                 /*
4075                  * If pickup mode is hash only, do not fail on sequence checks.
4076                  *
4077                  * If pickup mode is enabled and we did not see the SYN in
4078                  * both direction, do not fail on sequence checks because
4079                  * we do not have complete information on window scale.
4080                  *
4081                  * Adjust expiration and fall through to PASS packet.
4082                  * XXX Add a FIN check to reduce timeout?
4083                  */
4084                 (*state)->expire = time_second;
4085         } else  {
4086                 /*
4087                  * Failure processing
4088                  */
4089                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4090                     (*state)->src.state == TCPS_SYN_SENT) {
4091                         /* Send RST for state mismatches during handshake */
4092                         if (!(th->th_flags & TH_RST)) {
4093                                 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
4094
4095                                 if (th->th_flags & TH_SYN)
4096                                         ack++;
4097                                 if (th->th_flags & TH_FIN)
4098                                         ack++;
4099                                 pf_send_tcp((*state)->rule.ptr, pd->af,
4100                                     pd->dst, pd->src, th->th_dport,
4101                                     th->th_sport, ntohl(th->th_ack), ack,
4102                                     TH_RST|TH_ACK, 0, 0,
4103                                     (*state)->rule.ptr->return_ttl);
4104                         }
4105                         src->seqlo = 0;
4106                         src->seqhi = 1;
4107                         src->max_win = 1;
4108                 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4109                         kprintf("pf: BAD state: ");
4110                         pf_print_state(*state);
4111                         pf_print_flags(th->th_flags);
4112                         kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d "
4113                             "dir=%s,%s\n", seq, ack, pd->p_len, ackskew,
4114                             (*state)->packets[0], (*state)->packets[1],
4115                             direction == PF_IN ? "in" : "out",
4116                             direction == (*state)->direction ? "fwd" : "rev");
4117                         kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4118                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4119                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4120                             ' ': '2',
4121                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4122                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4123                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4124                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4125                 }
4126                 return (PF_DROP);
4127         }
4128
4129         if (dst->scrub || src->scrub) {
4130                 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4131                     src, dst, &copyback))
4132                         return (PF_DROP);
4133         }
4134
4135         /* Any packets which have gotten here are to be passed */
4136
4137         /* translate source/destination address, if necessary */
4138         if (STATE_TRANSLATE(*state)) {
4139                 if (direction == PF_OUT) {
4140                         pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4141                             &th->th_sum, &(*state)->gwy.addr,
4142                             (*state)->gwy.port, 0, pd->af);
4143                 } else {
4144                         /*
4145                          * If we don't redispatch the packet will go into
4146                          * the protocol stack on the wrong cpu for the
4147                          * post-translated address.
4148                          */
4149                         m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH;
4150                         pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4151                             &th->th_sum, &(*state)->lan.addr,
4152                             (*state)->lan.port, 0, pd->af);
4153                 }
4154                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4155         } else if (copyback) {
4156                 /* Copyback sequence modulation or stateful scrub changes */
4157                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4158         }
4159
4160         return (PF_PASS);
4161 }
4162
4163 int
4164 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4165     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4166 {
4167         struct pf_state_peer    *src, *dst;
4168         struct pf_state          key;
4169         struct udphdr           *uh = pd->hdr.udp;
4170
4171         key.af = pd->af;
4172         key.proto = IPPROTO_UDP;
4173         if (direction == PF_IN) {
4174                 PF_ACPY(&key.ext.addr, pd->src, key.af);
4175                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4176                 key.ext.port = uh->uh_sport;
4177                 key.gwy.port = uh->uh_dport;
4178         } else {
4179                 PF_ACPY(&key.lan.addr, pd->src, key.af);
4180                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4181                 key.lan.port = uh->uh_sport;
4182                 key.ext.port = uh->uh_dport;
4183         }
4184
4185         STATE_LOOKUP();
4186
4187         if (direction == (*state)->direction) {
4188                 src = &(*state)->src;
4189                 dst = &(*state)->dst;
4190         } else {
4191                 src = &(*state)->dst;
4192                 dst = &(*state)->src;
4193         }
4194
4195         /* update states */
4196         if (src->state < PFUDPS_SINGLE)
4197                 src->state = PFUDPS_SINGLE;
4198         if (dst->state == PFUDPS_SINGLE)
4199                 dst->state = PFUDPS_MULTIPLE;
4200
4201         /* update expire time */
4202         (*state)->expire = time_second;
4203         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4204                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4205         else
4206                 (*state)->timeout = PFTM_UDP_SINGLE;
4207
4208         /* translate source/destination address, if necessary */
4209         if (STATE_TRANSLATE(*state)) {
4210                 if (direction == PF_OUT) {
4211                         pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4212                             &uh->uh_sum, &(*state)->gwy.addr,
4213                             (*state)->gwy.port, 1, pd->af);
4214                 } else {
4215                         /*
4216                          * If we don't redispatch the packet will go into
4217                          * the protocol stack on the wrong cpu for the
4218                          * post-translated address.
4219                          */
4220                         m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH;
4221                         pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4222                             &uh->uh_sum, &(*state)->lan.addr,
4223                             (*state)->lan.port, 1, pd->af);
4224                 }
4225                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4226         }
4227
4228         return (PF_PASS);
4229 }
4230
4231 int
4232 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4233     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4234 {
4235         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4236         u_int16_t        icmpid = 0;
4237         u_int16_t       *icmpsum = NULL;
4238         u_int8_t         icmptype = 0;
4239         int              state_icmp = 0;
4240
4241         switch (pd->proto) {
4242 #ifdef INET
4243         case IPPROTO_ICMP:
4244                 icmptype = pd->hdr.icmp->icmp_type;
4245                 icmpid = pd->hdr.icmp->icmp_id;
4246                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4247
4248                 if (icmptype == ICMP_UNREACH ||
4249                     icmptype == ICMP_SOURCEQUENCH ||
4250                     icmptype == ICMP_REDIRECT ||
4251                     icmptype == ICMP_TIMXCEED ||
4252                     icmptype == ICMP_PARAMPROB)
4253                         state_icmp++;
4254                 break;
4255 #endif /* INET */
4256 #ifdef INET6
4257         case IPPROTO_ICMPV6:
4258                 icmptype = pd->hdr.icmp6->icmp6_type;
4259                 icmpid = pd->hdr.icmp6->icmp6_id;
4260                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4261
4262                 if (icmptype == ICMP6_DST_UNREACH ||
4263                     icmptype == ICMP6_PACKET_TOO_BIG ||
4264                     icmptype == ICMP6_TIME_EXCEEDED ||
4265                     icmptype == ICMP6_PARAM_PROB)
4266                         state_icmp++;
4267                 break;
4268 #endif /* INET6 */
4269         }
4270
4271         if (!state_icmp) {
4272
4273                 /*
4274                  * ICMP query/reply message not related to a TCP/UDP packet.
4275                  * Search for an ICMP state.
4276                  */
4277                 struct pf_state         key;
4278
4279                 key.af = pd->af;
4280                 key.proto = pd->proto;
4281                 if (direction == PF_IN) {
4282                         PF_ACPY(&key.ext.addr, pd->src, key.af);
4283                         PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4284                         key.ext.port = icmpid;
4285                         key.gwy.port = icmpid;
4286                 } else {
4287                         PF_ACPY(&key.lan.addr, pd->src, key.af);
4288                         PF_ACPY(&key.ext.addr, pd->dst, key.af);
4289                         key.lan.port = icmpid;
4290                         key.ext.port = icmpid;
4291                 }
4292
4293                 STATE_LOOKUP();
4294
4295                 (*state)->expire = time_second;
4296                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4297
4298                 /* translate source/destination address, if necessary */
4299                 if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) {
4300                         if (direction == PF_OUT) {
4301                                 switch (pd->af) {
4302 #ifdef INET
4303                                 case AF_INET:
4304                                         pf_change_a(&saddr->v4.s_addr,
4305                                             pd->ip_sum,
4306                                             (*state)->gwy.addr.v4.s_addr, 0);
4307                                         break;
4308 #endif /* INET */
4309 #ifdef INET6
4310                                 case AF_INET6:
4311                                         pf_change_a6(saddr,
4312                                             &pd->hdr.icmp6->icmp6_cksum,
4313                                             &(*state)->gwy.addr, 0);
4314                                         m_copyback(m, off,
4315                                             sizeof(struct icmp6_hdr),
4316                                             (caddr_t)pd->hdr.icmp6);
4317                                         break;
4318 #endif /* INET6 */
4319                                 }
4320                         } else {
4321                                 switch (pd->af) {
4322 #ifdef INET
4323                                 case AF_INET:
4324                                         pf_change_a(&daddr->v4.s_addr,
4325                                             pd->ip_sum,
4326                                             (*state)->lan.addr.v4.s_addr, 0);
4327                                         break;
4328 #endif /* INET */
4329 #ifdef INET6
4330                                 case AF_INET6:
4331                                         pf_change_a6(daddr,
4332                                             &pd->hdr.icmp6->icmp6_cksum,
4333                                             &(*state)->lan.addr, 0);
4334                                         m_copyback(m, off,
4335                                             sizeof(struct icmp6_hdr),
4336                                             (caddr_t)pd->hdr.icmp6);
4337                                         break;
4338 #endif /* INET6 */
4339                                 }
4340                         }
4341                 }
4342
4343                 return (PF_PASS);
4344
4345         } else {
4346                 /*
4347                  * ICMP error message in response to a TCP/UDP packet.
4348                  * Extract the inner TCP/UDP header and search for that state.
4349                  */
4350
4351                 struct pf_pdesc pd2;
4352 #ifdef INET
4353                 struct ip       h2;
4354 #endif /* INET */
4355 #ifdef INET6
4356                 struct ip6_hdr  h2_6;
4357                 int             terminal = 0;
4358 #endif /* INET6 */
4359                 int             ipoff2 = 0;
4360                 int             off2 = 0;
4361
4362                 pd2.af = pd->af;
4363                 switch (pd->af) {
4364 #ifdef INET
4365                 case AF_INET:
4366                         /* offset of h2 in mbuf chain */
4367                         ipoff2 = off + ICMP_MINLEN;
4368
4369                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4370                             NULL, NULL, pd2.af)) {
4371                                 DPFPRINTF(PF_DEBUG_MISC,
4372                                     ("pf: ICMP error message too short "
4373                                     "(ip)\n"));
4374                                 return (PF_DROP);
4375                         }
4376                         /*
4377                          * ICMP error messages don't refer to non-first
4378                          * fragments
4379                          */
4380                         /*
4381                          * Note: We are dealing with an encapsulated
4382                          * header. This means ip_off/ip_len are not
4383                          * in host byte order!
4384                          */
4385                         if (h2.ip_off & htons(IP_OFFMASK))
4386                                 return (PF_DROP);
4387
4388                         /* offset of protocol header that follows h2 */
4389                         off2 = ipoff2 + (h2.ip_hl << 2);
4390
4391                         pd2.proto = h2.ip_p;
4392                         pd2.src = (struct pf_addr *)&h2.ip_src;
4393                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4394                         pd2.ip_sum = &h2.ip_sum;
4395                         break;
4396 #endif /* INET */
4397 #ifdef INET6
4398                 case AF_INET6:
4399                         ipoff2 = off + sizeof(struct icmp6_hdr);
4400
4401                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4402                             NULL, NULL, pd2.af)) {
4403                                 DPFPRINTF(PF_DEBUG_MISC,
4404                                     ("pf: ICMP error message too short "
4405                                     "(ip6)\n"));
4406                                 return (PF_DROP);
4407                         }
4408                         pd2.proto = h2_6.ip6_nxt;
4409                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4410                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4411                         pd2.ip_sum = NULL;
4412                         off2 = ipoff2 + sizeof(h2_6);
4413                         do {
4414                                 switch (pd2.proto) {
4415                                 case IPPROTO_FRAGMENT:
4416                                         /*
4417                                          * ICMPv6 error messages for
4418                                          * non-first fragments
4419                                          */
4420                                         return (PF_DROP);
4421                                 case IPPROTO_AH:
4422                                 case IPPROTO_HOPOPTS:
4423                                 case IPPROTO_ROUTING:
4424                                 case IPPROTO_DSTOPTS: {
4425                                         /* get next header and header length */
4426                                         struct ip6_ext opt6;
4427
4428                                         if (!pf_pull_hdr(m, off2, &opt6,
4429                                             sizeof(opt6), NULL, NULL, pd2.af)) {
4430                                                 DPFPRINTF(PF_DEBUG_MISC,
4431                                                     ("pf: ICMPv6 short opt\n"));
4432                                                 return (PF_DROP);
4433                                         }
4434                                         if (pd2.proto == IPPROTO_AH)
4435                                                 off2 += (opt6.ip6e_len + 2) * 4;
4436                                         else
4437                                                 off2 += (opt6.ip6e_len + 1) * 8;
4438                                         pd2.proto = opt6.ip6e_nxt;
4439                                         /* goto the next header */
4440                                         break;
4441                                 }
4442                                 default:
4443                                         terminal++;
4444                                         break;
4445                                 }
4446                         } while (!terminal);
4447                         break;
4448 #endif /* INET6 */
4449                 default:
4450                         DPFPRINTF(PF_DEBUG_MISC,
4451                             ("pf: ICMP AF %d unknown (ip6)\n", pd->af));
4452                         return (PF_DROP);
4453                         break;
4454                 }
4455
4456                 switch (pd2.proto) {
4457                 case IPPROTO_TCP: {
4458                         struct tcphdr            th;
4459                         u_int32_t                seq;
4460                         struct pf_state          key;
4461                         struct pf_state_peer    *src, *dst;
4462                         u_int8_t                 dws;
4463                         int                      copyback = 0;
4464
4465                         /*
4466                          * Only the first 8 bytes of the TCP header can be
4467                          * expected. Don't access any TCP header fields after
4468                          * th_seq, an ackskew test is not possible.
4469                          */
4470                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, NULL, pd2.af)) {
4471                                 DPFPRINTF(PF_DEBUG_MISC,
4472                                     ("pf: ICMP error message too short "
4473                                     "(tcp)\n"));
4474                                 return (PF_DROP);
4475                         }
4476
4477                         key.af = pd2.af;
4478                         key.proto = IPPROTO_TCP;
4479                         if (direction == PF_IN) {
4480                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4481                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4482                                 key.ext.port = th.th_dport;
4483                                 key.gwy.port = th.th_sport;
4484                         } else {
4485                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4486                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4487                                 key.lan.port = th.th_dport;
4488                                 key.ext.port = th.th_sport;
4489                         }
4490
4491                         STATE_LOOKUP();
4492
4493                         if (direction == (*state)->direction) {
4494                                 src = &(*state)->dst;
4495                                 dst = &(*state)->src;
4496                         } else {
4497                                 src = &(*state)->src;
4498                                 dst = &(*state)->dst;
4499                         }
4500
4501                         if (src->wscale && dst->wscale &&
4502                             !(th.th_flags & TH_SYN))
4503                                 dws = dst->wscale & PF_WSCALE_MASK;
4504                         else
4505                                 dws = 0;
4506
4507                         /* Demodulate sequence number */
4508                         seq = ntohl(th.th_seq) - src->seqdiff;
4509                         if (src->seqdiff) {
4510                                 pf_change_a(&th.th_seq, icmpsum,
4511                                     htonl(seq), 0);
4512                                 copyback = 1;
4513                         }
4514
4515                         if (!SEQ_GEQ(src->seqhi, seq) ||
4516                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
4517                                 if (pf_status.debug >= PF_DEBUG_MISC) {
4518                                         kprintf("pf: BAD ICMP %d:%d ",
4519                                             icmptype, pd->hdr.icmp->icmp_code);
4520                                         pf_print_host(pd->src, 0, pd->af);
4521                                         kprintf(" -> ");
4522                                         pf_print_host(pd->dst, 0, pd->af);
4523                                         kprintf(" state: ");
4524                                         pf_print_state(*state);
4525                                         kprintf(" seq=%u\n", seq);
4526                                 }
4527                                 return (PF_DROP);
4528                         }
4529
4530                         if (STATE_TRANSLATE(*state)) {
4531                                 if (direction == PF_IN) {
4532                                         pf_change_icmp(pd2.src, &th.th_sport,
4533                                             daddr, &(*state)->lan.addr,
4534                                             (*state)->lan.port, NULL,
4535                                             pd2.ip_sum, icmpsum,
4536                                             pd->ip_sum, 0, pd2.af);
4537                                 } else {
4538                                         pf_change_icmp(pd2.dst, &th.th_dport,
4539                                             saddr, &(*state)->gwy.addr,
4540                                             (*state)->gwy.port, NULL,
4541                                             pd2.ip_sum, icmpsum,
4542                                             pd->ip_sum, 0, pd2.af);
4543                                 }
4544                                 copyback = 1;
4545                         }
4546
4547                         if (copyback) {
4548                                 switch (pd2.af) {
4549 #ifdef INET
4550                                 case AF_INET:
4551                                         m_copyback(m, off, ICMP_MINLEN,
4552                                             (caddr_t)pd->hdr.icmp);
4553                                         m_copyback(m, ipoff2, sizeof(h2),
4554                                             (caddr_t)&h2);
4555                                         break;
4556 #endif /* INET */
4557 #ifdef INET6
4558                                 case AF_INET6:
4559                                         m_copyback(m, off,
4560                                             sizeof(struct icmp6_hdr),
4561                                             (caddr_t)pd->hdr.icmp6);
4562                                         m_copyback(m, ipoff2, sizeof(h2_6),
4563                                             (caddr_t)&h2_6);
4564                                         break;
4565 #endif /* INET6 */
4566                                 }
4567                                 m_copyback(m, off2, 8, (caddr_t)&th);
4568                         }
4569
4570                         return (PF_PASS);
4571                         break;
4572                 }
4573                 case IPPROTO_UDP: {
4574                         struct udphdr           uh;
4575                         struct pf_state         key;
4576
4577                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4578                             NULL, NULL, pd2.af)) {
4579                                 DPFPRINTF(PF_DEBUG_MISC,
4580                                     ("pf: ICMP error message too short "
4581                                     "(udp)\n"));
4582                                 return (PF_DROP);
4583                         }
4584
4585                         key.af = pd2.af;
4586                         key.proto = IPPROTO_UDP;
4587                         if (direction == PF_IN) {
4588                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4589                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4590                                 key.ext.port = uh.uh_dport;
4591                                 key.gwy.port = uh.uh_sport;
4592                         } else {
4593                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4594                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4595                                 key.lan.port = uh.uh_dport;
4596                                 key.ext.port = uh.uh_sport;
4597                         }
4598
4599                         STATE_LOOKUP();
4600
4601                         if (STATE_TRANSLATE(*state)) {
4602                                 if (direction == PF_IN) {
4603                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4604                                             daddr, &(*state)->lan.addr,
4605                                             (*state)->lan.port, &uh.uh_sum,
4606                                             pd2.ip_sum, icmpsum,
4607                                             pd->ip_sum, 1, pd2.af);
4608                                 } else {
4609                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4610                                             saddr, &(*state)->gwy.addr,
4611                                             (*state)->gwy.port, &uh.uh_sum,
4612                                             pd2.ip_sum, icmpsum,
4613                                             pd->ip_sum, 1, pd2.af);
4614                                 }
4615                                 switch (pd2.af) {
4616 #ifdef INET
4617                                 case AF_INET:
4618                                         m_copyback(m, off, ICMP_MINLEN,
4619                                             (caddr_t)pd->hdr.icmp);
4620                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4621                                         break;
4622 #endif /* INET */
4623 #ifdef INET6
4624                                 case AF_INET6:
4625                                         m_copyback(m, off,
4626                                             sizeof(struct icmp6_hdr),
4627                                             (caddr_t)pd->hdr.icmp6);
4628                                         m_copyback(m, ipoff2, sizeof(h2_6),
4629                                             (caddr_t)&h2_6);
4630                                         break;
4631 #endif /* INET6 */
4632                                 }
4633                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4634                         }
4635
4636                         return (PF_PASS);
4637                         break;
4638                 }
4639 #ifdef INET
4640                 case IPPROTO_ICMP: {
4641                         struct icmp             iih;
4642                         struct pf_state         key;
4643
4644                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4645                             NULL, NULL, pd2.af)) {
4646                                 DPFPRINTF(PF_DEBUG_MISC,
4647                                     ("pf: ICMP error message too short i"
4648                                     "(icmp)\n"));
4649                                 return (PF_DROP);
4650                         }
4651
4652                         key.af = pd2.af;
4653                         key.proto = IPPROTO_ICMP;
4654                         if (direction == PF_IN) {
4655                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4656                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4657                                 key.ext.port = iih.icmp_id;
4658                                 key.gwy.port = iih.icmp_id;
4659                         } else {
4660                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4661                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4662                                 key.lan.port = iih.icmp_id;
4663                                 key.ext.port = iih.icmp_id;
4664                         }
4665
4666                         STATE_LOOKUP();
4667
4668                         if (STATE_TRANSLATE(*state)) {
4669                                 if (direction == PF_IN) {
4670                                         pf_change_icmp(pd2.src, &iih.icmp_id,
4671                                             daddr, &(*state)->lan.addr,
4672                                             (*state)->lan.port, NULL,
4673                                             pd2.ip_sum, icmpsum,
4674                                             pd->ip_sum, 0, AF_INET);
4675                                 } else {
4676                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
4677                                             saddr, &(*state)->gwy.addr,
4678                                             (*state)->gwy.port, NULL,
4679                                             pd2.ip_sum, icmpsum,
4680                                             pd->ip_sum, 0, AF_INET);
4681                                 }
4682                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
4683                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4684                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
4685                         }
4686
4687                         return (PF_PASS);
4688                         break;
4689                 }
4690 #endif /* INET */
4691 #ifdef INET6
4692                 case IPPROTO_ICMPV6: {
4693                         struct icmp6_hdr        iih;
4694                         struct pf_state         key;
4695
4696                         if (!pf_pull_hdr(m, off2, &iih,
4697                             sizeof(struct icmp6_hdr), NULL, NULL, pd2.af)) {
4698                                 DPFPRINTF(PF_DEBUG_MISC,
4699                                     ("pf: ICMP error message too short "
4700                                     "(icmp6)\n"));
4701                                 return (PF_DROP);
4702                         }
4703
4704                         key.af = pd2.af;
4705                         key.proto = IPPROTO_ICMPV6;
4706                         if (direction == PF_IN) {
4707                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4708                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4709                                 key.ext.port = iih.icmp6_id;
4710                                 key.gwy.port = iih.icmp6_id;
4711                         } else {
4712                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4713                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4714                                 key.lan.port = iih.icmp6_id;
4715                                 key.ext.port = iih.icmp6_id;
4716                         }
4717
4718                         STATE_LOOKUP();
4719
4720                         if (STATE_TRANSLATE(*state)) {
4721                                 if (direction == PF_IN) {
4722                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
4723                                             daddr, &(*state)->lan.addr,
4724                                             (*state)->lan.port, NULL,
4725                                             pd2.ip_sum, icmpsum,
4726                                             pd->ip_sum, 0, AF_INET6);
4727                                 } else {
4728                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
4729                                             saddr, &(*state)->gwy.addr,
4730                                             (*state)->gwy.port, NULL,
4731                                             pd2.ip_sum, icmpsum,
4732                                             pd->ip_sum, 0, AF_INET6);
4733                                 }
4734                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4735                                     (caddr_t)pd->hdr.icmp6);
4736                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
4737                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
4738                                     (caddr_t)&iih);
4739                         }
4740
4741                         return (PF_PASS);
4742                         break;
4743                 }
4744 #endif /* INET6 */
4745                 default: {
4746                         struct pf_state         key;
4747
4748                         key.af = pd2.af;
4749                         key.proto = pd2.proto;
4750                         if (direction == PF_IN) {
4751                                 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4752                                 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4753                                 key.ext.port = 0;
4754                                 key.gwy.port = 0;
4755                         } else {
4756                                 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4757                                 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4758                                 key.lan.port = 0;
4759                                 key.ext.port = 0;
4760                         }
4761
4762                         STATE_LOOKUP();
4763
4764                         if (STATE_TRANSLATE(*state)) {
4765                                 if (direction == PF_IN) {
4766                                         pf_change_icmp(pd2.src, NULL,
4767                                             daddr, &(*state)->lan.addr,
4768                                             0, NULL,
4769                                             pd2.ip_sum, icmpsum,
4770                                             pd->ip_sum, 0, pd2.af);
4771                                 } else {
4772                                         pf_change_icmp(pd2.dst, NULL,
4773                                             saddr, &(*state)->gwy.addr,
4774                                             0, NULL,
4775                                             pd2.ip_sum, icmpsum,
4776                                             pd->ip_sum, 0, pd2.af);
4777                                 }
4778                                 switch (pd2.af) {
4779 #ifdef INET
4780                                 case AF_INET:
4781                                         m_copyback(m, off, ICMP_MINLEN,
4782                                             (caddr_t)pd->hdr.icmp);
4783                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4784                                         break;
4785 #endif /* INET */
4786 #ifdef INET6
4787                                 case AF_INET6:
4788                                         m_copyback(m, off,
4789                                             sizeof(struct icmp6_hdr),
4790                                             (caddr_t)pd->hdr.icmp6);
4791                                         m_copyback(m, ipoff2, sizeof(h2_6),
4792                                             (caddr_t)&h2_6);
4793                                         break;
4794 #endif /* INET6 */
4795                                 }
4796                         }
4797
4798                         return (PF_PASS);
4799                         break;
4800                 }
4801                 }
4802         }
4803 }
4804
4805 int
4806 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
4807     struct pf_pdesc *pd)
4808 {
4809         struct pf_state_peer    *src, *dst;
4810         struct pf_state          key;
4811
4812         key.af = pd->af;
4813         key.proto = pd->proto;
4814         if (direction == PF_IN) {
4815                 PF_ACPY(&key.ext.addr, pd->src, key.af);
4816                 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4817                 key.ext.port = 0;
4818                 key.gwy.port = 0;
4819         } else {
4820                 PF_ACPY(&key.lan.addr, pd->src, key.af);
4821                 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4822                 key.lan.port = 0;
4823                 key.ext.port = 0;
4824         }
4825
4826         STATE_LOOKUP();
4827
4828         if (direction == (*state)->direction) {
4829                 src = &(*state)->src;
4830                 dst = &(*state)->dst;
4831         } else {
4832                 src = &(*state)->dst;
4833                 dst = &(*state)->src;
4834         }
4835
4836         /* update states */
4837         if (src->state < PFOTHERS_SINGLE)
4838                 src->state = PFOTHERS_SINGLE;
4839         if (dst->state == PFOTHERS_SINGLE)
4840                 dst->state = PFOTHERS_MULTIPLE;
4841
4842         /* update expire time */
4843         (*state)->expire = time_second;
4844         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
4845                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
4846         else
4847                 (*state)->timeout = PFTM_OTHER_SINGLE;
4848
4849         /* translate source/destination address, if necessary */
4850         if (STATE_TRANSLATE(*state)) {
4851                 if (direction == PF_OUT)
4852                         switch (pd->af) {
4853 #ifdef INET
4854                         case AF_INET:
4855                                 pf_change_a(&pd->src->v4.s_addr,
4856                                     pd->ip_sum, (*state)->gwy.addr.v4.s_addr,
4857                                     0);
4858                                 break;
4859 #endif /* INET */
4860 #ifdef INET6
4861                         case AF_INET6:
4862                                 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af);
4863                                 break;
4864 #endif /* INET6 */
4865                         }
4866                 else
4867                         switch (pd->af) {
4868 #ifdef INET
4869                         case AF_INET:
4870                                 pf_change_a(&pd->dst->v4.s_addr,
4871                                     pd->ip_sum, (*state)->lan.addr.v4.s_addr,
4872                                     0);
4873                                 break;
4874 #endif /* INET */
4875 #ifdef INET6
4876                         case AF_INET6:
4877                                 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af);
4878                                 break;
4879 #endif /* INET6 */
4880                         }
4881         }
4882
4883         return (PF_PASS);
4884 }
4885
4886 /*
4887  * ipoff and off are measured from the start of the mbuf chain.
4888  * h must be at "ipoff" on the mbuf chain.
4889  */
4890 void *
4891 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
4892     u_short *actionp, u_short *reasonp, sa_family_t af)
4893 {
4894         switch (af) {
4895 #ifdef INET
4896         case AF_INET: {
4897                 struct ip       *h = mtod(m, struct ip *);
4898                 u_int16_t        fragoff = (h->ip_off & IP_OFFMASK) << 3;
4899
4900                 if (fragoff) {
4901                         if (fragoff >= len)
4902                                 ACTION_SET(actionp, PF_PASS);
4903                         else {
4904                                 ACTION_SET(actionp, PF_DROP);
4905                                 REASON_SET(reasonp, PFRES_FRAG);
4906                         }
4907                         return (NULL);
4908                 }
4909                 if (m->m_pkthdr.len < off + len ||
4910                     h->ip_len < off + len) {
4911                         ACTION_SET(actionp, PF_DROP);
4912                         REASON_SET(reasonp, PFRES_SHORT);
4913                         return (NULL);
4914                 }
4915                 break;
4916         }
4917 #endif /* INET */
4918 #ifdef INET6
4919         case AF_INET6: {
4920                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
4921
4922                 if (m->m_pkthdr.len < off + len ||
4923                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
4924                     (unsigned)(off + len)) {
4925                         ACTION_SET(actionp, PF_DROP);
4926                         REASON_SET(reasonp, PFRES_SHORT);
4927                         return (NULL);
4928                 }
4929                 break;
4930         }
4931 #endif /* INET6 */
4932         }
4933         m_copydata(m, off, len, p);
4934         return (p);
4935 }
4936
4937 int
4938 pf_routable(struct pf_addr *addr, sa_family_t af)
4939 {
4940         struct sockaddr_in      *dst;
4941         struct route             ro;
4942         int                      ret = 0;
4943
4944         bzero(&ro, sizeof(ro));
4945         dst = satosin(&ro.ro_dst);
4946         dst->sin_family = af;
4947         dst->sin_len = sizeof(*dst);
4948         dst->sin_addr = addr->v4;
4949         rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
4950
4951         if (ro.ro_rt != NULL) {
4952                 ret = 1;
4953                 RTFREE(ro.ro_rt);
4954         }
4955
4956         return (ret);
4957 }
4958
4959 #ifdef INET
4960 void
4961 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
4962     struct pf_state *s)
4963 {
4964         struct mbuf             *m0, *m1;
4965         struct route             iproute;
4966         struct route            *ro = NULL;
4967         struct sockaddr_in      *dst;
4968         struct ip               *ip;
4969         struct ifnet            *ifp = NULL;
4970         struct pf_addr           naddr;
4971         struct pf_src_node      *sn = NULL;
4972         int                      error = 0;
4973         int sw_csum;
4974
4975         if (m == NULL || *m == NULL || r == NULL ||
4976             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
4977                 panic("pf_route: invalid parameters");
4978
4979         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
4980                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
4981                 (*m)->m_pkthdr.pf_routed = 1;
4982         } else {
4983                 if ((*m)->m_pkthdr.pf_routed > 3) {
4984                         m0 = *m;
4985                         *m = NULL;
4986                         goto bad;
4987                 }
4988                 (*m)->m_pkthdr.pf_routed++;
4989         }
4990
4991         if (r->rt == PF_DUPTO) {
4992                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
4993                         return;
4994         } else {
4995                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
4996                         return;
4997                 m0 = *m;
4998         }
4999
5000         if (m0->m_len < sizeof(struct ip))
5001                 panic("pf_route: m0->m_len < sizeof(struct ip)");
5002         ip = mtod(m0, struct ip *);
5003
5004         ro = &iproute;
5005         bzero((caddr_t)ro, sizeof(*ro));
5006         dst = satosin(&ro->ro_dst);
5007         dst->sin_family = AF_INET;
5008         dst->sin_len = sizeof(*dst);
5009         dst->sin_addr = ip->ip_dst;
5010
5011         if (r->rt == PF_FASTROUTE) {
5012                 rtalloc(ro);
5013                 if (ro->ro_rt == 0) {
5014                         ipstat.ips_noroute++;
5015                         goto bad;
5016                 }
5017
5018                 ifp = ro->ro_rt->rt_ifp;
5019                 ro->ro_rt->rt_use++;
5020
5021                 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
5022                         dst = satosin(ro->ro_rt->rt_gateway);
5023         } else {
5024                 if (TAILQ_EMPTY(&r->rpool.list))
5025                         panic("pf_route: TAILQ_EMPTY(&r->rpool.list)");
5026                 if (s == NULL) {
5027                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5028                             &naddr, NULL, &sn);
5029                         if (!PF_AZERO(&naddr, AF_INET))
5030                                 dst->sin_addr.s_addr = naddr.v4.s_addr;
5031                         ifp = r->rpool.cur->kif ?
5032                             r->rpool.cur->kif->pfik_ifp : NULL;
5033                 } else {
5034                         if (!PF_AZERO(&s->rt_addr, AF_INET))
5035                                 dst->sin_addr.s_addr =
5036                                     s->rt_addr.v4.s_addr;
5037                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5038                 }
5039         }
5040         if (ifp == NULL)
5041                 goto bad;
5042
5043         if (oifp != ifp) {
5044                 if (pf_test(PF_OUT, ifp, &m0) != PF_PASS)
5045                         goto bad;
5046                 else if (m0 == NULL)
5047                         goto done;
5048                 if (m0->m_len < sizeof(struct ip))
5049                         panic("pf_route: m0->m_len < sizeof(struct ip)");
5050                 ip = mtod(m0, struct ip *);
5051         }
5052
5053         /* Copied from ip_output. */
5054         m0->m_pkthdr.csum_flags |= CSUM_IP;
5055         sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
5056         if (sw_csum & CSUM_DELAY_DATA) {
5057                 in_delayed_cksum(m0);
5058                 sw_csum &= ~CSUM_DELAY_DATA;
5059         }
5060         m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
5061
5062         /*
5063          * If small enough for interface, or the interface will take
5064          * care of the fragmentation for us, can just send directly.
5065          */
5066         if (ip->ip_len <= ifp->if_mtu || ((ifp->if_hwassist & CSUM_FRAGMENT) &&
5067                 (ip->ip_off & IP_DF) == 0)) {
5068                 ip->ip_len = htons(ip->ip_len);
5069                 ip->ip_off = htons(ip->ip_off);
5070                 ip->ip_sum = 0;
5071                 if (sw_csum & CSUM_DELAY_IP) {
5072                         /* From KAME */
5073                         if (ip->ip_v == IPVERSION &&
5074                             (ip->ip_hl << 2) == sizeof(*ip)) {
5075                                 ip->ip_sum = in_cksum_hdr(ip);
5076                         } else {
5077                                 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5078                         }
5079                 }
5080
5081                 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt);
5082                 goto done;
5083         }
5084
5085         /*
5086          * Too large for interface; fragment if possible.
5087          * Must be able to put at least 8 bytes per fragment.
5088          */
5089         if (ip->ip_off & IP_DF) {
5090                 ipstat.ips_cantfrag++;
5091                 if (r->rt != PF_DUPTO) {
5092                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5093                             ifp->if_mtu);
5094                         goto done;
5095                 } else
5096                         goto bad;
5097         }
5098
5099         m1 = m0;
5100         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5101         if (error)
5102                 goto bad;
5103
5104         for (m0 = m1; m0; m0 = m1) {
5105                 m1 = m0->m_nextpkt;
5106                 m0->m_nextpkt = 0;
5107                 if (error == 0) {
5108                         error = ifp->if_output(ifp, m0, sintosa(dst), NULL);
5109                 } else {
5110                         m_freem(m0);
5111                 }
5112         }
5113
5114         if (error == 0)
5115                 ipstat.ips_fragmented++;
5116
5117 done:
5118         if (r->rt != PF_DUPTO)
5119                 *m = NULL;
5120         if (ro == &iproute && ro->ro_rt)
5121                 RTFREE(ro->ro_rt);
5122         return;
5123
5124 bad:
5125         m_freem(m0);
5126         goto done;
5127 }
5128 #endif /* INET */
5129
5130 #ifdef INET6
5131 void
5132 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5133     struct pf_state *s)
5134 {
5135         struct mbuf             *m0;
5136         struct route_in6         ip6route;
5137         struct route_in6        *ro;
5138         struct sockaddr_in6     *dst;
5139         struct ip6_hdr          *ip6;
5140         struct ifnet            *ifp = NULL;
5141         struct pf_addr           naddr;
5142         struct pf_src_node      *sn = NULL;
5143         int                      error = 0;
5144
5145         if (m == NULL || *m == NULL || r == NULL ||
5146             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5147                 panic("pf_route6: invalid parameters");
5148
5149         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5150                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5151                 (*m)->m_pkthdr.pf_routed = 1;
5152         } else {
5153                 if ((*m)->m_pkthdr.pf_routed > 3) {
5154                         m0 = *m;
5155                         *m = NULL;
5156                         goto bad;
5157                 }
5158                 (*m)->m_pkthdr.pf_routed++;
5159         }
5160
5161         if (r->rt == PF_DUPTO) {
5162                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5163                         return;
5164         } else {
5165                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5166                         return;
5167                 m0 = *m;
5168         }
5169
5170         if (m0->m_len < sizeof(struct ip6_hdr))
5171                 panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5172         ip6 = mtod(m0, struct ip6_hdr *);
5173
5174         ro = &ip6route;
5175         bzero((caddr_t)ro, sizeof(*ro));
5176         dst = (struct sockaddr_in6 *)&ro->ro_dst;
5177         dst->sin6_family = AF_INET6;
5178         dst->sin6_len = sizeof(*dst);
5179         dst->sin6_addr = ip6->ip6_dst;
5180
5181         /* Cheat. */
5182         if (r->rt == PF_FASTROUTE) {
5183                 m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED;
5184                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5185                 return;
5186         }
5187
5188         if (TAILQ_EMPTY(&r->rpool.list))
5189                 panic("pf_route6: TAILQ_EMPTY(&r->rpool.list)");
5190         if (s == NULL) {
5191                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5192                     &naddr, NULL, &sn);
5193                 if (!PF_AZERO(&naddr, AF_INET6))
5194                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5195                             &naddr, AF_INET6);
5196                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5197         } else {
5198                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5199                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5200                             &s->rt_addr, AF_INET6);
5201                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5202         }
5203         if (ifp == NULL)
5204                 goto bad;
5205
5206         if (oifp != ifp) {
5207                 if (pf_test6(PF_OUT, ifp, &m0) != PF_PASS)
5208                         goto bad;
5209                 else if (m0 == NULL)
5210                         goto done;
5211                 if (m0->m_len < sizeof(struct ip6_hdr))
5212                         panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5213                 ip6 = mtod(m0, struct ip6_hdr *);
5214         }
5215
5216         /*
5217          * If the packet is too large for the outgoing interface,
5218          * send back an icmp6 error.
5219          */
5220         if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5221                 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5222         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5223                 error = nd6_output(ifp, ifp, m0, dst, NULL);
5224         } else {
5225                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5226                 if (r->rt != PF_DUPTO)
5227                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5228                 else
5229                         goto bad;
5230         }
5231
5232 done:
5233         if (r->rt != PF_DUPTO)
5234                 *m = NULL;
5235         return;
5236
5237 bad:
5238         m_freem(m0);
5239         goto done;
5240 }
5241 #endif /* INET6 */
5242
5243
5244 /*
5245  * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5246  *   off is the offset where the protocol header starts
5247  *   len is the total length of protocol header plus payload
5248  * returns 0 when the checksum is valid, otherwise returns 1.
5249  */
5250 /*
5251  * XXX
5252  * FreeBSD supports cksum offload for the following drivers.
5253  * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5254  * If we can make full use of it we would outperform ipfw/ipfilter in
5255  * very heavy traffic.
5256  * I have not tested 'cause I don't have NICs that supports cksum offload.
5257  * (There might be problems. Typical phenomena would be
5258  *   1. No route message for UDP packet.
5259  *   2. No connection acceptance from external hosts regardless of rule set.)
5260  */
5261 int
5262 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5263     sa_family_t af)
5264 {
5265         u_int16_t sum = 0;
5266         int hw_assist = 0;
5267         struct ip *ip;
5268
5269         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5270                 return (1);
5271         if (m->m_pkthdr.len < off + len)
5272                 return (1);
5273
5274         switch (p) {
5275         case IPPROTO_TCP:
5276         case IPPROTO_UDP:
5277                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5278                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5279                                 sum = m->m_pkthdr.csum_data;
5280                         } else {
5281                                 ip = mtod(m, struct ip *);
5282                                 sum = in_pseudo(ip->ip_src.s_addr,
5283                                         ip->ip_dst.s_addr, htonl((u_short)len +
5284                                         m->m_pkthdr.csum_data + p));
5285                         }
5286                         sum ^= 0xffff;
5287                         ++hw_assist;
5288                 }
5289                 break;
5290         case IPPROTO_ICMP:
5291 #ifdef INET6
5292         case IPPROTO_ICMPV6:
5293 #endif /* INET6 */
5294                 break;
5295         default:
5296                 return (1);
5297         }
5298
5299         if (!hw_assist) {
5300                 switch (af) {
5301                 case AF_INET:
5302                         if (p == IPPROTO_ICMP) {
5303                                 if (m->m_len < off)
5304                                         return (1);
5305                                 m->m_data += off;
5306                                 m->m_len -= off;
5307                                 sum = in_cksum(m, len);
5308                                 m->m_data -= off;
5309                                 m->m_len += off;
5310                         } else {
5311                                 if (m->m_len < sizeof(struct ip))
5312                                         return (1);
5313                                 sum = in_cksum_range(m, p, off, len);
5314                                 if (sum == 0) {
5315                                         m->m_pkthdr.csum_flags |=
5316                                             (CSUM_DATA_VALID |
5317                                              CSUM_PSEUDO_HDR);
5318                                         m->m_pkthdr.csum_data = 0xffff;
5319                                 }
5320                         }
5321                         break;
5322 #ifdef INET6
5323                 case AF_INET6:
5324                         if (m->m_len < sizeof(struct ip6_hdr))
5325                                 return (1);
5326                         sum = in6_cksum(m, p, off, len);
5327                         /*
5328                          * XXX
5329                          * IPv6 H/W cksum off-load not supported yet!
5330                          *
5331                          * if (sum == 0) {
5332                          *      m->m_pkthdr.csum_flags |=
5333                          *          (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5334                          *      m->m_pkthdr.csum_data = 0xffff;
5335                          *}
5336                          */
5337                         break;
5338 #endif /* INET6 */
5339                 default:
5340                         return (1);
5341                 }
5342         }
5343         if (sum) {
5344                 switch (p) {
5345                 case IPPROTO_TCP:
5346                         tcpstat.tcps_rcvbadsum++;
5347                         break;
5348                 case IPPROTO_UDP:
5349                         udpstat.udps_badsum++;
5350                         break;
5351                 case IPPROTO_ICMP:
5352                         icmpstat.icps_checksum++;
5353                         break;
5354 #ifdef INET6
5355                 case IPPROTO_ICMPV6:
5356                         icmp6stat.icp6s_checksum++;
5357                         break;
5358 #endif /* INET6 */
5359                 }
5360                 return (1);
5361         }
5362         return (0);
5363 }
5364
5365 #ifdef INET
5366 int
5367 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0)
5368 {
5369         struct pfi_kif          *kif;
5370         u_short                  action, reason = 0, log = 0;
5371         struct mbuf             *m = *m0;
5372         struct ip               *h = NULL;
5373         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5374         struct pf_state         *s = NULL;
5375         struct pf_ruleset       *ruleset = NULL;
5376         struct pf_pdesc          pd;
5377         int                      off, dirndx, pqid = 0;
5378
5379         if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED))
5380                 return (PF_PASS);
5381
5382         kif = pfi_index2kif[ifp->if_index];
5383         if (kif == NULL)
5384                 return (PF_DROP);
5385
5386 #ifdef DIAGNOSTIC
5387         if ((m->m_flags & M_PKTHDR) == 0)
5388                 panic("non-M_PKTHDR is passed to pf_test");
5389 #endif
5390
5391         memset(&pd, 0, sizeof(pd));
5392         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5393                 action = PF_DROP;
5394                 REASON_SET(&reason, PFRES_SHORT);
5395                 log = 1;
5396                 goto done;
5397         }
5398
5399         /* We do IP header normalization and packet reassembly here */
5400         if (pf_normalize_ip(m0, dir, kif, &reason) != PF_PASS) {
5401                 action = PF_DROP;
5402                 goto done;
5403         }
5404         m = *m0;
5405         h = mtod(m, struct ip *);
5406
5407         off = h->ip_hl << 2;
5408         if (off < (int)sizeof(*h)) {
5409                 action = PF_DROP;
5410                 REASON_SET(&reason, PFRES_SHORT);
5411                 log = 1;
5412                 goto done;
5413         }
5414
5415         pd.src = (struct pf_addr *)&h->ip_src;
5416         pd.dst = (struct pf_addr *)&h->ip_dst;
5417         PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
5418         pd.ip_sum = &h->ip_sum;
5419         pd.proto = h->ip_p;
5420         pd.af = AF_INET;
5421         pd.tos = h->ip_tos;
5422         pd.tot_len = h->ip_len;
5423
5424         /* handle fragments that didn't get reassembled by normalization */
5425         if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5426                 action = pf_test_fragment(&r, dir, kif, m, h,
5427                     &pd, &a, &ruleset);
5428                 goto done;
5429         }
5430
5431         switch (h->ip_p) {
5432
5433         case IPPROTO_TCP: {
5434                 struct tcphdr   th;
5435
5436                 pd.hdr.tcp = &th;
5437                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5438                     &action, &reason, AF_INET)) {
5439                         log = action != PF_PASS;
5440                         goto done;
5441                 }
5442                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5443                     h->ip_len - off, IPPROTO_TCP, AF_INET)) {
5444                         action = PF_DROP;
5445                         goto done;
5446                 }
5447                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5448                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5449                         pqid = 1;
5450                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5451                 if (action == PF_DROP)
5452                         goto done;
5453                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5454                     &reason);
5455                 if (action == PF_PASS) {
5456 #if NPFSYNC
5457                         pfsync_update_state(s);
5458 #endif
5459                         r = s->rule.ptr;
5460                         a = s->anchor.ptr;
5461                         log = s->log;
5462                 } else if (s == NULL)
5463                         action = pf_test_tcp(&r, &s, dir, kif,
5464                             m, off, h, &pd, &a, &ruleset);
5465                 break;
5466         }
5467
5468         case IPPROTO_UDP: {
5469                 struct udphdr   uh;
5470
5471                 pd.hdr.udp = &uh;
5472                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5473                     &action, &reason, AF_INET)) {
5474                         log = action != PF_PASS;
5475                         goto done;
5476                 }
5477                 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5478                     off, h->ip_len - off, IPPROTO_UDP, AF_INET)) {
5479                         action = PF_DROP;
5480                         goto done;
5481                 }
5482                 if (uh.uh_dport == 0 ||
5483                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5484                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5485                         action = PF_DROP;
5486                         goto done;
5487                 }
5488                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5489                 if (action == PF_PASS) {
5490 #if NPFSYNC
5491                         pfsync_update_state(s);
5492 #endif
5493                         r = s->rule.ptr;
5494                         a = s->anchor.ptr;
5495                         log = s->log;
5496                 } else if (s == NULL)
5497                         action = pf_test_udp(&r, &s, dir, kif,
5498                             m, off, h, &pd, &a, &ruleset);
5499                 break;
5500         }
5501
5502         case IPPROTO_ICMP: {
5503                 struct icmp     ih;
5504
5505                 pd.hdr.icmp = &ih;
5506                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5507                     &action, &reason, AF_INET)) {
5508                         log = action != PF_PASS;
5509                         goto done;
5510                 }
5511                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5512                     h->ip_len - off, IPPROTO_ICMP, AF_INET)) {
5513                         action = PF_DROP;
5514                         goto done;
5515                 }
5516                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd);
5517                 if (action == PF_PASS) {
5518 #if NPFSYNC
5519                         pfsync_update_state(s);
5520 #endif
5521                         r = s->rule.ptr;
5522                         a = s->anchor.ptr;
5523                         log = s->log;
5524                 } else if (s == NULL)
5525                         action = pf_test_icmp(&r, &s, dir, kif,
5526                             m, off, h, &pd, &a, &ruleset);
5527                 break;
5528         }
5529
5530         default:
5531                 action = pf_test_state_other(&s, dir, kif, &pd);
5532                 if (action == PF_PASS) {
5533 #if NPFSYNC
5534                         pfsync_update_state(s);
5535 #endif
5536                         r = s->rule.ptr;
5537                         a = s->anchor.ptr;
5538                         log = s->log;
5539                 } else if (s == NULL)
5540                         action = pf_test_other(&r, &s, dir, kif, m, off, h,
5541                             &pd, &a, &ruleset);
5542                 break;
5543         }
5544
5545 done:
5546         if (action == PF_PASS && h->ip_hl > 5 &&
5547             !((s && s->allow_opts) || r->allow_opts)) {
5548                 action = PF_DROP;
5549                 REASON_SET(&reason, PFRES_SHORT);
5550                 log = 1;
5551                 DPFPRINTF(PF_DEBUG_MISC,
5552                     ("pf: dropping packet with ip options\n"));
5553         }
5554
5555 #ifdef ALTQ
5556         if (action == PF_PASS && r->qid) {
5557                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
5558                 if (pd.tos == IPTOS_LOWDELAY)
5559                         m->m_pkthdr.altq_qid = r->pqid;
5560                 else
5561                         m->m_pkthdr.altq_qid = r->qid;
5562                 if (s) {
5563                         KKASSERT(s->hash != 0);
5564                         m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED;
5565                         m->m_pkthdr.altq_state_hash = s->hash;
5566                 }
5567                 m->m_pkthdr.ecn_af = AF_INET;
5568                 m->m_pkthdr.header = h;
5569         }
5570 #endif
5571
5572         /*
5573          * connections redirected to loopback should not match sockets
5574          * bound specifically to loopback due to security implications,
5575          * see tcp_input() and in_pcblookup_listen().
5576          */
5577         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5578             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5579             (s->nat_rule.ptr->action == PF_RDR ||
5580             s->nat_rule.ptr->action == PF_BINAT) &&
5581             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
5582                 action = PF_DROP;
5583                 REASON_SET(&reason, PFRES_MEMORY);
5584         }
5585
5586         m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5587
5588         if (log)
5589                 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset);
5590
5591         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5592         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
5593
5594         if (action == PF_PASS || r->action == PF_DROP) {
5595                 r->packets++;
5596                 r->bytes += pd.tot_len;
5597                 if (a != NULL) {
5598                         a->packets++;
5599                         a->bytes += pd.tot_len;
5600                 }
5601                 if (s != NULL) {
5602                         dirndx = (dir == s->direction) ? 0 : 1;
5603                         s->packets[dirndx]++;
5604                         s->bytes[dirndx] += pd.tot_len;
5605                         if (s->nat_rule.ptr != NULL) {
5606                                 s->nat_rule.ptr->packets++;
5607                                 s->nat_rule.ptr->bytes += pd.tot_len;
5608                         }
5609                         if (s->src_node != NULL) {
5610                                 s->src_node->packets++;
5611                                 s->src_node->bytes += pd.tot_len;
5612                         }
5613                         if (s->nat_src_node != NULL) {
5614                                 s->nat_src_node->packets++;
5615                                 s->nat_src_node->bytes += pd.tot_len;
5616                         }
5617                 }
5618                 tr = r;
5619                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5620                 if (nr != NULL) {
5621                         struct pf_addr *x;
5622                         /*
5623                          * XXX: we need to make sure that the addresses
5624                          * passed to pfr_update_stats() are the same than
5625                          * the addresses used during matching (pfr_match)
5626                          */
5627                         if (r == &pf_default_rule) {
5628                                 tr = nr;
5629                                 x = (s == NULL || s->direction == dir) ?
5630                                     &pd.baddr : &pd.naddr;
5631                         } else
5632                                 x = (s == NULL || s->direction == dir) ?
5633                                     &pd.naddr : &pd.baddr;
5634                         if (x == &pd.baddr || s == NULL) {
5635                                 /* we need to change the address */
5636                                 if (dir == PF_OUT)
5637                                         pd.src = x;
5638                                 else
5639                                         pd.dst = x;
5640                         }
5641                 }
5642                 if (tr->src.addr.type == PF_ADDR_TABLE)
5643                         pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5644                             s->direction == dir) ? pd.src : pd.dst, pd.af,
5645                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5646                             tr->src.not);
5647                 if (tr->dst.addr.type == PF_ADDR_TABLE)
5648                         pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5649                             s->direction == dir) ? pd.dst : pd.src, pd.af,
5650                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5651                             tr->dst.not);
5652         }
5653
5654
5655         if (action == PF_SYNPROXY_DROP) {
5656                 m_freem(*m0);
5657                 *m0 = NULL;
5658                 action = PF_PASS;
5659         } else if (r->rt)
5660                 /* pf_route can free the mbuf causing *m0 to become NULL */
5661                 pf_route(m0, r, dir, ifp, s);
5662
5663         return (action);
5664 }
5665 #endif /* INET */
5666
5667 #ifdef INET6
5668 int
5669 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0)
5670 {
5671         struct pfi_kif          *kif;
5672         u_short                  action, reason = 0, log = 0;
5673         struct mbuf             *m = *m0;
5674         struct ip6_hdr          *h = NULL;
5675         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5676         struct pf_state         *s = NULL;
5677         struct pf_ruleset       *ruleset = NULL;
5678         struct pf_pdesc          pd;
5679         int                      off, terminal = 0, dirndx;
5680
5681         if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED))
5682                 return (PF_PASS);
5683
5684         kif = pfi_index2kif[ifp->if_index];
5685         if (kif == NULL)
5686                 return (PF_DROP);
5687
5688 #ifdef DIAGNOSTIC
5689         if ((m->m_flags & M_PKTHDR) == 0)
5690                 panic("non-M_PKTHDR is passed to pf_test");
5691 #endif
5692
5693         memset(&pd, 0, sizeof(pd));
5694         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5695                 action = PF_DROP;
5696                 REASON_SET(&reason, PFRES_SHORT);
5697                 log = 1;
5698                 goto done;
5699         }
5700
5701         /* We do IP header normalization and packet reassembly here */
5702         if (pf_normalize_ip6(m0, dir, kif, &reason) != PF_PASS) {
5703                 action = PF_DROP;
5704                 goto done;
5705         }
5706         m = *m0;
5707         h = mtod(m, struct ip6_hdr *);
5708
5709         pd.src = (struct pf_addr *)&h->ip6_src;
5710         pd.dst = (struct pf_addr *)&h->ip6_dst;
5711         PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
5712         pd.ip_sum = NULL;
5713         pd.af = AF_INET6;
5714         pd.tos = 0;
5715         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
5716
5717         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
5718         pd.proto = h->ip6_nxt;
5719         do {
5720                 switch (pd.proto) {
5721                 case IPPROTO_FRAGMENT:
5722                         action = pf_test_fragment(&r, dir, kif, m, h,
5723                             &pd, &a, &ruleset);
5724                         if (action == PF_DROP)
5725                                 REASON_SET(&reason, PFRES_FRAG);
5726                         goto done;
5727                 case IPPROTO_AH:
5728                 case IPPROTO_HOPOPTS:
5729                 case IPPROTO_ROUTING:
5730                 case IPPROTO_DSTOPTS: {
5731                         /* get next header and header length */
5732                         struct ip6_ext  opt6;
5733
5734                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
5735                             NULL, NULL, pd.af)) {
5736                                 DPFPRINTF(PF_DEBUG_MISC,
5737                                     ("pf: IPv6 short opt\n"));
5738                                 action = PF_DROP;
5739                                 REASON_SET(&reason, PFRES_SHORT);
5740                                 log = 1;
5741                                 goto done;
5742                         }
5743                         if (pd.proto == IPPROTO_AH)
5744                                 off += (opt6.ip6e_len + 2) * 4;
5745                         else
5746                                 off += (opt6.ip6e_len + 1) * 8;
5747                         pd.proto = opt6.ip6e_nxt;
5748                         /* goto the next header */
5749                         break;
5750                 }
5751                 default:
5752                         terminal++;
5753                         break;
5754                 }
5755         } while (!terminal);
5756
5757         switch (pd.proto) {
5758
5759         case IPPROTO_TCP: {
5760                 struct tcphdr   th;
5761
5762                 pd.hdr.tcp = &th;
5763                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5764                     &action, &reason, AF_INET6)) {
5765                         log = action != PF_PASS;
5766                         goto done;
5767                 }
5768                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5769                     ntohs(h->ip6_plen), IPPROTO_TCP, AF_INET6)) {
5770                         action = PF_DROP;
5771                         goto done;
5772                 }
5773                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5774                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5775                 if (action == PF_DROP)
5776                         goto done;
5777                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5778                     &reason);
5779                 if (action == PF_PASS) {
5780 #if NPFSYNC
5781                         pfsync_update_state(s);
5782 #endif
5783                         r = s->rule.ptr;
5784                         a = s->anchor.ptr;
5785                         log = s->log;
5786                 } else if (s == NULL)
5787                         action = pf_test_tcp(&r, &s, dir, kif,
5788                             m, off, h, &pd, &a, &ruleset);
5789                 break;
5790         }
5791
5792         case IPPROTO_UDP: {
5793                 struct udphdr   uh;
5794
5795                 pd.hdr.udp = &uh;
5796                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5797                     &action, &reason, AF_INET6)) {
5798                         log = action != PF_PASS;
5799                         goto done;
5800                 }
5801                 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5802                     off, ntohs(h->ip6_plen), IPPROTO_UDP, AF_INET6)) {
5803                         action = PF_DROP;
5804                         goto done;
5805                 }
5806                 if (uh.uh_dport == 0 ||
5807                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5808                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5809                         action = PF_DROP;
5810                         goto done;
5811                 }
5812                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5813                 if (action == PF_PASS) {
5814 #if NPFSYNC
5815                         pfsync_update_state(s);
5816 #endif
5817                         r = s->rule.ptr;
5818                         a = s->anchor.ptr;
5819                         log = s->log;
5820                 } else if (s == NULL)
5821                         action = pf_test_udp(&r, &s, dir, kif,
5822                             m, off, h, &pd, &a, &ruleset);
5823                 break;
5824         }
5825
5826         case IPPROTO_ICMPV6: {
5827                 struct icmp6_hdr        ih;
5828
5829                 pd.hdr.icmp6 = &ih;
5830                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
5831                     &action, &reason, AF_INET6)) {
5832                         log = action != PF_PASS;
5833                         goto done;
5834                 }
5835                 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5836                     ntohs(h->ip6_plen), IPPROTO_ICMPV6, AF_INET6)) {
5837                         action = PF_DROP;
5838                         goto done;
5839                 }
5840                 action = pf_test_state_icmp(&s, dir, kif,
5841                     m, off, h, &pd);
5842                 if (action == PF_PASS) {
5843 #if NPFSYNC
5844                         pfsync_update_state(s);
5845 #endif
5846                         r = s->rule.ptr;
5847                         a = s->anchor.ptr;
5848                         log = s->log;
5849                 } else if (s == NULL)
5850                         action = pf_test_icmp(&r, &s, dir, kif,
5851                             m, off, h, &pd, &a, &ruleset);
5852                 break;
5853         }
5854
5855         default:
5856                 action = pf_test_state_other(&s, dir, kif, &pd);
5857                 if (action == PF_PASS) {
5858                         r = s->rule.ptr;
5859                         a = s->anchor.ptr;
5860                         log = s->log;
5861                 } else if (s == NULL)
5862                         action = pf_test_other(&r, &s, dir, kif, m, off, h,
5863                             &pd, &a, &ruleset);
5864                 break;
5865         }
5866
5867 done:
5868         /* XXX handle IPv6 options, if not allowed. not implemented. */
5869
5870 #ifdef ALTQ
5871         if (action == PF_PASS && r->qid) {
5872                 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
5873                 if (pd.tos == IPTOS_LOWDELAY)
5874                         m->m_pkthdr.altq_qid = r->pqid;
5875                 else
5876                         m->m_pkthdr.altq_qid = r->qid;
5877                 if (s) {
5878                         KKASSERT(s->hash != 0);
5879                         m->m_pkthdr.fw_flags |= ALTQ_MBUF_STATE_HASHED;
5880                         m->m_pkthdr.altq_state_hash = s->hash;
5881                 }
5882                 m->m_pkthdr.ecn_af = AF_INET6;
5883                 m->m_pkthdr.header = h;
5884         }
5885 #endif
5886
5887         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5888             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5889             (s->nat_rule.ptr->action == PF_RDR ||
5890             s->nat_rule.ptr->action == PF_BINAT) &&
5891             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) {
5892                 action = PF_DROP;
5893                 REASON_SET(&reason, PFRES_MEMORY);
5894         }
5895
5896         m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5897
5898         if (log)
5899                 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset);
5900
5901         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5902         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
5903
5904         if (action == PF_PASS || r->action == PF_DROP) {
5905                 r->packets++;
5906                 r->bytes += pd.tot_len;
5907                 if (a != NULL) {
5908                         a->packets++;
5909                         a->bytes += pd.tot_len;
5910                 }
5911                 if (s != NULL) {
5912                         dirndx = (dir == s->direction) ? 0 : 1;
5913                         s->packets[dirndx]++;
5914                         s->bytes[dirndx] += pd.tot_len;
5915                         if (s->nat_rule.ptr != NULL) {
5916                                 s->nat_rule.ptr->packets++;
5917                                 s->nat_rule.ptr->bytes += pd.tot_len;
5918                         }
5919                         if (s->src_node != NULL) {
5920                                 s->src_node->packets++;
5921                                 s->src_node->bytes += pd.tot_len;
5922                         }
5923                         if (s->nat_src_node != NULL) {
5924                                 s->nat_src_node->packets++;
5925                                 s->nat_src_node->bytes += pd.tot_len;
5926                         }
5927                 }
5928                 tr = r;
5929                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5930                 if (nr != NULL) {
5931                         struct pf_addr *x;
5932                         /*
5933                          * XXX: we need to make sure that the addresses
5934                          * passed to pfr_update_stats() are the same than
5935                          * the addresses used during matching (pfr_match)
5936                          */
5937                         if (r == &pf_default_rule) {
5938                                 tr = nr;
5939                                 x = (s == NULL || s->direction == dir) ?
5940                                     &pd.baddr : &pd.naddr;
5941                         } else {
5942                                 x = (s == NULL || s->direction == dir) ?
5943                                     &pd.naddr : &pd.baddr;
5944                         }
5945                         if (x == &pd.baddr || s == NULL) {
5946                                 if (dir == PF_OUT)
5947                                         pd.src = x;
5948                                 else
5949                                         pd.dst = x;
5950                         }
5951                 }
5952                 if (tr->src.addr.type == PF_ADDR_TABLE)
5953                         pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5954                             s->direction == dir) ? pd.src : pd.dst, pd.af,
5955                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5956                             tr->src.not);
5957                 if (tr->dst.addr.type == PF_ADDR_TABLE)
5958                         pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5959                             s->direction == dir) ? pd.dst : pd.src, pd.af,
5960                             pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5961                             tr->dst.not);
5962         }
5963
5964
5965         if (action == PF_SYNPROXY_DROP) {
5966                 m_freem(*m0);
5967                 *m0 = NULL;
5968                 action = PF_PASS;
5969         } else if (r->rt)
5970                 /* pf_route6 can free the mbuf causing *m0 to become NULL */
5971                 pf_route6(m0, r, dir, ifp, s);
5972
5973         return (action);
5974 }
5975 #endif /* INET6 */