sys/contrib/pf/net/pf.c

   1 /*      $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ */
   2
   3 /*
   4  * Copyright (c) 2001 Daniel Hartmeier
   5  * Copyright (c) 2002 - 2008 Henning Brauer
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  *    - Redistributions of source code must retain the above copyright
  13  *      notice, this list of conditions and the following disclaimer.
  14  *    - Redistributions in binary form must reproduce the above
  15  *      copyright notice, this list of conditions and the following
  16  *      disclaimer in the documentation and/or other materials provided
  17  *      with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  22  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  23  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  25  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  27  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  29  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * Effort sponsored in part by the Defense Advanced Research Projects
  33  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  34  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  35  *
  36  */
  37
  38 #ifdef __FreeBSD__
  39 #include "opt_inet.h"
  40 #include "opt_inet6.h"
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44 #endif
  45
  46 #ifdef __FreeBSD__
  47 #include "opt_bpf.h"
  48 #include "opt_pf.h"
  49
  50 #define NPFSYNC         1
  51
  52 #ifdef DEV_PFLOW
  53 #define NPFLOW          DEV_PFLOW
  54 #else
  55 #define NPFLOW          0
  56 #endif
  57
  58 #else
  59 #include "bpfilter.h"
  60 #include "pflog.h"
  61 #include "pfsync.h"
  62 #include "pflow.h"
  63 #endif
  64
  65 #include <sys/param.h>
  66 #include <sys/systm.h>
  67 #include <sys/mbuf.h>
  68 #include <sys/filio.h>
  69 #include <sys/socket.h>
  70 #include <sys/socketvar.h>
  71 #include <sys/kernel.h>
  72 #include <sys/time.h>
  73 #ifdef __FreeBSD__
  74 #include <sys/random.h>
  75 #include <sys/sysctl.h>
  76 #include <sys/endian.h>
  77 #define betoh64         be64toh
  78 #else
  79 #include <sys/pool.h>
  80 #endif
  81 #include <sys/proc.h>
  82 #ifdef __FreeBSD__
  83 #include <sys/kthread.h>
  84 #include <sys/lock.h>
  85 #include <sys/sx.h>
  86 #else
  87 #include <sys/rwlock.h>
  88 #endif
  89
  90 #ifdef __FreeBSD__
  91 #include <sys/md5.h>
  92 #else
  93 #include <crypto/md5.h>
  94 #endif
  95
  96 #include <net/if.h>
  97 #include <net/if_types.h>
  98 #include <net/bpf.h>
  99 #include <net/route.h>
 100 #ifdef __FreeBSD__
 101 #ifdef RADIX_MPATH
 102 #include <net/radix_mpath.h>
 103 #endif
 104 #else
 105 #include <net/radix_mpath.h>
 106 #endif
 107
 108 #include <netinet/in.h>
 109 #include <netinet/in_var.h>
 110 #include <netinet/in_systm.h>
 111 #include <netinet/ip.h>
 112 #include <netinet/ip_var.h>
 113 #include <netinet/tcp.h>
 114 #include <netinet/tcp_seq.h>
 115 #include <netinet/udp.h>
 116 #include <netinet/ip_icmp.h>
 117 #include <netinet/in_pcb.h>
 118 #include <netinet/tcp_timer.h>
 119 #include <netinet/tcp_var.h>
 120 #include <netinet/udp_var.h>
 121 #include <netinet/icmp_var.h>
 122 #include <netinet/if_ether.h>
 123 #ifdef __FreeBSD__
 124 #include <netinet/ip_fw.h>
 125 #include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */
 126 #endif
 127
 128 #ifndef __FreeBSD__
 129 #include <dev/rndvar.h>
 130 #endif
 131 #include <net/pfvar.h>
 132 #include <net/if_pflog.h>
 133 #include <net/if_pflow.h>
 134 #include <net/if_pfsync.h>
 135
 136 #ifdef INET6
 137 #include <netinet/ip6.h>
 138 #include <netinet/in_pcb.h>
 139 #include <netinet/icmp6.h>
 140 #include <netinet6/nd6.h>
 141 #ifdef __FreeBSD__
 142 #include <netinet6/ip6_var.h>
 143 #include <netinet6/in6_pcb.h>
 144 #endif
 145 #endif /* INET6 */
 146
 147 #ifdef __FreeBSD__
 148 #include <machine/in_cksum.h>
 149 #include <sys/limits.h>
 150 #include <sys/ucred.h>
 151 #include <security/mac/mac_framework.h>
 152
 153 extern int ip_optcopy(struct ip *, struct ip *);
 154 #endif
 155
 156 #ifdef __FreeBSD__
 157 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
 158 #else
 159 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x
 160 #endif
 161
 162 /*
 163  * Global variables
 164  */
 165
 166 /* state tables */
 167 #ifdef __FreeBSD__
 168 VNET_DEFINE(struct pf_state_tree,        pf_statetbl);
 169
 170 VNET_DEFINE(struct pf_altqqueue,         pf_altqs[2]);
 171 VNET_DEFINE(struct pf_palist,            pf_pabuf);
 172 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_active);
 173 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_inactive);
 174 VNET_DEFINE(struct pf_status,            pf_status);
 175
 176 VNET_DEFINE(u_int32_t,                   ticket_altqs_active);
 177 VNET_DEFINE(u_int32_t,                   ticket_altqs_inactive);
 178 VNET_DEFINE(int,                         altqs_inactive_open);
 179 VNET_DEFINE(u_int32_t,                   ticket_pabuf);
 180
 181 VNET_DEFINE(MD5_CTX,                     pf_tcp_secret_ctx);
 182 #define V_pf_tcp_secret_ctx              VNET(pf_tcp_secret_ctx)
 183 VNET_DEFINE(u_char,                      pf_tcp_secret[16]);
 184 #define V_pf_tcp_secret                  VNET(pf_tcp_secret)
 185 VNET_DEFINE(int,                         pf_tcp_secret_init);
 186 #define V_pf_tcp_secret_init             VNET(pf_tcp_secret_init)
 187 VNET_DEFINE(int,                         pf_tcp_iss_off);
 188 #define V_pf_tcp_iss_off                 VNET(pf_tcp_iss_off)
 189
 190 struct pf_anchor_stackframe {
 191         struct pf_ruleset               *rs;
 192         struct pf_rule                  *r;
 193         struct pf_anchor_node           *parent;
 194         struct pf_anchor                *child;
 195 };
 196 VNET_DEFINE(struct pf_anchor_stackframe, pf_anchor_stack[64]);
 197 #define V_pf_anchor_stack                VNET(pf_anchor_stack)
 198
 199 VNET_DEFINE(uma_zone_t,  pf_src_tree_pl);
 200 VNET_DEFINE(uma_zone_t,  pf_rule_pl);
 201 VNET_DEFINE(uma_zone_t,  pf_pooladdr_pl);
 202 VNET_DEFINE(uma_zone_t,  pf_state_pl);
 203 VNET_DEFINE(uma_zone_t,  pf_state_key_pl);
 204 VNET_DEFINE(uma_zone_t,  pf_state_item_pl);
 205 VNET_DEFINE(uma_zone_t,  pf_altq_pl);
 206 #else
 207 struct pf_state_tree     pf_statetbl;
 208
 209 struct pf_altqqueue      pf_altqs[2];
 210 struct pf_palist         pf_pabuf;
 211 struct pf_altqqueue     *pf_altqs_active;
 212 struct pf_altqqueue     *pf_altqs_inactive;
 213 struct pf_status         pf_status;
 214
 215 u_int32_t                ticket_altqs_active;
 216 u_int32_t                ticket_altqs_inactive;
 217 int                      altqs_inactive_open;
 218 u_int32_t                ticket_pabuf;
 219
 220 MD5_CTX                  pf_tcp_secret_ctx;
 221 u_char                   pf_tcp_secret[16];
 222 int                      pf_tcp_secret_init;
 223 int                      pf_tcp_iss_off;
 224
 225 struct pf_anchor_stackframe {
 226         struct pf_ruleset                       *rs;
 227         struct pf_rule                          *r;
 228         struct pf_anchor_node                   *parent;
 229         struct pf_anchor                        *child;
 230 } pf_anchor_stack[64];
 231
 232 struct pool              pf_src_tree_pl, pf_rule_pl, pf_pooladdr_pl;
 233 struct pool              pf_state_pl, pf_state_key_pl, pf_state_item_pl;
 234 struct pool              pf_altq_pl;
 235 #endif
 236
 237 void                     pf_init_threshold(struct pf_threshold *, u_int32_t,
 238                             u_int32_t);
 239 void                     pf_add_threshold(struct pf_threshold *);
 240 int                      pf_check_threshold(struct pf_threshold *);
 241
 242 void                     pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *,
 243                             u_int16_t *, u_int16_t *, struct pf_addr *,
 244                             u_int16_t, u_int8_t, sa_family_t);
 245 int                      pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
 246                             struct tcphdr *, struct pf_state_peer *);
 247 #ifdef INET6
 248 void                     pf_change_a6(struct pf_addr *, u_int16_t *,
 249                             struct pf_addr *, u_int8_t);
 250 #endif /* INET6 */
 251 void                     pf_change_icmp(struct pf_addr *, u_int16_t *,
 252                             struct pf_addr *, struct pf_addr *, u_int16_t,
 253                             u_int16_t *, u_int16_t *, u_int16_t *,
 254                             u_int16_t *, u_int8_t, sa_family_t);
 255 #ifdef __FreeBSD__
 256 void                     pf_send_tcp(struct mbuf *,
 257                             const struct pf_rule *, sa_family_t,
 258 #else
 259 void                     pf_send_tcp(const struct pf_rule *, sa_family_t,
 260 #endif
 261                             const struct pf_addr *, const struct pf_addr *,
 262                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 263                             u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
 264                             u_int16_t, struct ether_header *, struct ifnet *);
 265 static void              pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 266                             sa_family_t, struct pf_rule *);
 267 void                     pf_detach_state(struct pf_state *);
 268 void                     pf_state_key_detach(struct pf_state *, int);
 269 u_int32_t                pf_tcp_iss(struct pf_pdesc *);
 270 int                      pf_test_rule(struct pf_rule **, struct pf_state **,
 271                             int, struct pfi_kif *, struct mbuf *, int,
 272                             void *, struct pf_pdesc *, struct pf_rule **,
 273 #ifdef __FreeBSD__
 274                             struct pf_ruleset **, struct ifqueue *,
 275                             struct inpcb *);
 276 #else
 277                             struct pf_ruleset **, struct ifqueue *);
 278 #endif
 279 static __inline int      pf_create_state(struct pf_rule *, struct pf_rule *,
 280                             struct pf_rule *, struct pf_pdesc *,
 281                             struct pf_src_node *, struct pf_state_key *,
 282                             struct pf_state_key *, struct pf_state_key *,
 283                             struct pf_state_key *, struct mbuf *, int,
 284                             u_int16_t, u_int16_t, int *, struct pfi_kif *,
 285                             struct pf_state **, int, u_int16_t, u_int16_t,
 286                             int);
 287 int                      pf_test_fragment(struct pf_rule **, int,
 288                             struct pfi_kif *, struct mbuf *, void *,
 289                             struct pf_pdesc *, struct pf_rule **,
 290                             struct pf_ruleset **);
 291 int                      pf_tcp_track_full(struct pf_state_peer *,
 292                             struct pf_state_peer *, struct pf_state **,
 293                             struct pfi_kif *, struct mbuf *, int,
 294                             struct pf_pdesc *, u_short *, int *);
 295 int                     pf_tcp_track_sloppy(struct pf_state_peer *,
 296                             struct pf_state_peer *, struct pf_state **,
 297                             struct pf_pdesc *, u_short *);
 298 int                      pf_test_state_tcp(struct pf_state **, int,
 299                             struct pfi_kif *, struct mbuf *, int,
 300                             void *, struct pf_pdesc *, u_short *);
 301 int                      pf_test_state_udp(struct pf_state **, int,
 302                             struct pfi_kif *, struct mbuf *, int,
 303                             void *, struct pf_pdesc *);
 304 int                      pf_test_state_icmp(struct pf_state **, int,
 305                             struct pfi_kif *, struct mbuf *, int,
 306                             void *, struct pf_pdesc *, u_short *);
 307 int                      pf_test_state_other(struct pf_state **, int,
 308                             struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
 309 void                     pf_route(struct mbuf **, struct pf_rule *, int,
 310                             struct ifnet *, struct pf_state *,
 311                             struct pf_pdesc *);
 312 void                     pf_route6(struct mbuf **, struct pf_rule *, int,
 313                             struct ifnet *, struct pf_state *,
 314                             struct pf_pdesc *);
 315 #ifndef __FreeBSD__
 316 int                      pf_socket_lookup(int, struct pf_pdesc *);
 317 #endif
 318 u_int8_t                 pf_get_wscale(struct mbuf *, int, u_int16_t,
 319                             sa_family_t);
 320 u_int16_t                pf_get_mss(struct mbuf *, int, u_int16_t,
 321                             sa_family_t);
 322 u_int16_t                pf_calc_mss(struct pf_addr *, sa_family_t,
 323                                 int, u_int16_t);
 324 void                     pf_set_rt_ifp(struct pf_state *,
 325                             struct pf_addr *);
 326 int                      pf_check_proto_cksum(struct mbuf *, int, int,
 327                             u_int8_t, sa_family_t);
 328 #ifndef __FreeBSD__
 329 struct pf_divert        *pf_get_divert(struct mbuf *);
 330 #endif
 331 void                     pf_print_state_parts(struct pf_state *,
 332                             struct pf_state_key *, struct pf_state_key *);
 333 int                      pf_addr_wrap_neq(struct pf_addr_wrap *,
 334                             struct pf_addr_wrap *);
 335 int                      pf_compare_state_keys(struct pf_state_key *,
 336                             struct pf_state_key *, struct pfi_kif *, u_int);
 337 #ifdef __FreeBSD__
 338 struct pf_state         *pf_find_state(struct pfi_kif *,
 339                             struct pf_state_key_cmp *, u_int, struct mbuf *,
 340                             struct pf_mtag *);
 341 #else
 342 struct pf_state         *pf_find_state(struct pfi_kif *,
 343                             struct pf_state_key_cmp *, u_int, struct mbuf *);
 344 #endif
 345 int                      pf_src_connlimit(struct pf_state **);
 346 int                      pf_check_congestion(struct ifqueue *);
 347
 348 #ifdef __FreeBSD__
 349 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len);
 350
 351 VNET_DECLARE(int, pf_end_threads);
 352
 353 VNET_DEFINE(struct pf_pool_limit, pf_pool_limits[PF_LIMIT_MAX]);
 354 #else
 355 extern struct pool pfr_ktable_pl;
 356 extern struct pool pfr_kentry_pl;
 357
 358 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
 359         { &pf_state_pl, PFSTATE_HIWAT },
 360         { &pf_src_tree_pl, PFSNODE_HIWAT },
 361         { &pf_frent_pl, PFFRAG_FRENT_HIWAT },
 362         { &pfr_ktable_pl, PFR_KTABLE_HIWAT },
 363         { &pfr_kentry_pl, PFR_KENTRY_HIWAT }
 364 };
 365 #endif
 366
 367 #ifdef __FreeBSD__
 368 #define PPACKET_LOOPED()                                                \
 369         (pd->pf_mtag->flags & PF_PACKET_LOOPED)
 370
 371 #define PACKET_LOOPED()                                                 \
 372         (pd.pf_mtag->flags & PF_PACKET_LOOPED)
 373
 374 #define STATE_LOOKUP(i, k, d, s, m, pt)                                 \
 375         do {                                                            \
 376                 s = pf_find_state(i, k, d, m, pt);                      \
 377                 if (s == NULL || (s)->timeout == PFTM_PURGE)            \
 378                         return (PF_DROP);                               \
 379                 if (PPACKET_LOOPED())                                   \
 380                         return (PF_PASS);                               \
 381                 if (d == PF_OUT &&                                      \
 382                     (((s)->rule.ptr->rt == PF_ROUTETO &&                \
 383                     (s)->rule.ptr->direction == PF_OUT) ||              \
 384                     ((s)->rule.ptr->rt == PF_REPLYTO &&                 \
 385                     (s)->rule.ptr->direction == PF_IN)) &&              \
 386                     (s)->rt_kif != NULL &&                              \
 387                     (s)->rt_kif != i)                                   \
 388                         return (PF_PASS);                               \
 389         } while (0)
 390 #else
 391 #define STATE_LOOKUP(i, k, d, s, m)                                     \
 392         do {                                                            \
 393                 s = pf_find_state(i, k, d, m);                          \
 394                 if (s == NULL || (s)->timeout == PFTM_PURGE)            \
 395                         return (PF_DROP);                               \
 396                 if (d == PF_OUT &&                                      \
 397                     (((s)->rule.ptr->rt == PF_ROUTETO &&                \
 398                     (s)->rule.ptr->direction == PF_OUT) ||              \
 399                     ((s)->rule.ptr->rt == PF_REPLYTO &&                 \
 400                     (s)->rule.ptr->direction == PF_IN)) &&              \
 401                     (s)->rt_kif != NULL &&                              \
 402                     (s)->rt_kif != i)                                   \
 403                         return (PF_PASS);                               \
 404         } while (0)
 405 #endif
 406
 407 #ifdef __FreeBSD__
 408 #define BOUND_IFACE(r, k) \
 409         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all
 410 #else
 411 #define BOUND_IFACE(r, k) \
 412         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
 413 #endif
 414
 415 #define STATE_INC_COUNTERS(s)                           \
 416         do {                                            \
 417                 s->rule.ptr->states_cur++;              \
 418                 s->rule.ptr->states_tot++;              \
 419                 if (s->anchor.ptr != NULL) {            \
 420                         s->anchor.ptr->states_cur++;    \
 421                         s->anchor.ptr->states_tot++;    \
 422                 }                                       \
 423                 if (s->nat_rule.ptr != NULL) {          \
 424                         s->nat_rule.ptr->states_cur++;  \
 425                         s->nat_rule.ptr->states_tot++;  \
 426                 }                                       \
 427         } while (0)
 428
 429 #define STATE_DEC_COUNTERS(s)                           \
 430         do {                                            \
 431                 if (s->nat_rule.ptr != NULL)            \
 432                         s->nat_rule.ptr->states_cur--;  \
 433                 if (s->anchor.ptr != NULL)              \
 434                         s->anchor.ptr->states_cur--;    \
 435                 s->rule.ptr->states_cur--;              \
 436         } while (0)
 437
 438 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
 439 static __inline int pf_state_compare_key(struct pf_state_key *,
 440         struct pf_state_key *);
 441 static __inline int pf_state_compare_id(struct pf_state *,
 442         struct pf_state *);
 443
 444 #ifdef __FreeBSD__
 445 VNET_DEFINE(struct pf_src_tree,          tree_src_tracking);
 446
 447 VNET_DEFINE(struct pf_state_tree_id,     tree_id);
 448 VNET_DEFINE(struct pf_state_queue,       state_list);
 449 #else
 450 struct pf_src_tree tree_src_tracking;
 451
 452 struct pf_state_tree_id tree_id;
 453 struct pf_state_queue state_list;
 454 #endif
 455
 456 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
 457 RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key);
 458 RB_GENERATE(pf_state_tree_id, pf_state,
 459     entry_id, pf_state_compare_id);
 460
 461 static __inline int
 462 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
 463 {
 464         int     diff;
 465
 466         if (a->rule.ptr > b->rule.ptr)
 467                 return (1);
 468         if (a->rule.ptr < b->rule.ptr)
 469                 return (-1);
 470         if ((diff = a->af - b->af) != 0)
 471                 return (diff);
 472         switch (a->af) {
 473 #ifdef INET
 474         case AF_INET:
 475                 if (a->addr.addr32[0] > b->addr.addr32[0])
 476                         return (1);
 477                 if (a->addr.addr32[0] < b->addr.addr32[0])
 478                         return (-1);
 479                 break;
 480 #endif /* INET */
 481 #ifdef INET6
 482         case AF_INET6:
 483                 if (a->addr.addr32[3] > b->addr.addr32[3])
 484                         return (1);
 485                 if (a->addr.addr32[3] < b->addr.addr32[3])
 486                         return (-1);
 487                 if (a->addr.addr32[2] > b->addr.addr32[2])
 488                         return (1);
 489                 if (a->addr.addr32[2] < b->addr.addr32[2])
 490                         return (-1);
 491                 if (a->addr.addr32[1] > b->addr.addr32[1])
 492                         return (1);
 493                 if (a->addr.addr32[1] < b->addr.addr32[1])
 494                         return (-1);
 495                 if (a->addr.addr32[0] > b->addr.addr32[0])
 496                         return (1);
 497                 if (a->addr.addr32[0] < b->addr.addr32[0])
 498                         return (-1);
 499                 break;
 500 #endif /* INET6 */
 501         }
 502         return (0);
 503 }
 504
 505 #ifdef INET6
 506 void
 507 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 508 {
 509         switch (af) {
 510 #ifdef INET
 511         case AF_INET:
 512                 dst->addr32[0] = src->addr32[0];
 513                 break;
 514 #endif /* INET */
 515         case AF_INET6:
 516                 dst->addr32[0] = src->addr32[0];
 517                 dst->addr32[1] = src->addr32[1];
 518                 dst->addr32[2] = src->addr32[2];
 519                 dst->addr32[3] = src->addr32[3];
 520                 break;
 521         }
 522 }
 523 #endif /* INET6 */
 524
 525 void
 526 pf_init_threshold(struct pf_threshold *threshold,
 527     u_int32_t limit, u_int32_t seconds)
 528 {
 529         threshold->limit = limit * PF_THRESHOLD_MULT;
 530         threshold->seconds = seconds;
 531         threshold->count = 0;
 532         threshold->last = time_second;
 533 }
 534
 535 void
 536 pf_add_threshold(struct pf_threshold *threshold)
 537 {
 538         u_int32_t t = time_second, diff = t - threshold->last;
 539
 540         if (diff >= threshold->seconds)
 541                 threshold->count = 0;
 542         else
 543                 threshold->count -= threshold->count * diff /
 544                     threshold->seconds;
 545         threshold->count += PF_THRESHOLD_MULT;
 546         threshold->last = t;
 547 }
 548
 549 int
 550 pf_check_threshold(struct pf_threshold *threshold)
 551 {
 552         return (threshold->count > threshold->limit);
 553 }
 554
 555 int
 556 pf_src_connlimit(struct pf_state **state)
 557 {
 558         int bad = 0;
 559
 560         (*state)->src_node->conn++;
 561         (*state)->src.tcp_est = 1;
 562         pf_add_threshold(&(*state)->src_node->conn_rate);
 563
 564         if ((*state)->rule.ptr->max_src_conn &&
 565             (*state)->rule.ptr->max_src_conn <
 566             (*state)->src_node->conn) {
 567 #ifdef __FreeBSD__
 568                 V_pf_status.lcounters[LCNT_SRCCONN]++;
 569 #else
 570                 pf_status.lcounters[LCNT_SRCCONN]++;
 571 #endif
 572                 bad++;
 573         }
 574
 575         if ((*state)->rule.ptr->max_src_conn_rate.limit &&
 576             pf_check_threshold(&(*state)->src_node->conn_rate)) {
 577 #ifdef __FreeBSD__
 578                 V_pf_status.lcounters[LCNT_SRCCONNRATE]++;
 579 #else
 580                 pf_status.lcounters[LCNT_SRCCONNRATE]++;
 581 #endif
 582                 bad++;
 583         }
 584
 585         if (!bad)
 586                 return (0);
 587
 588         if ((*state)->rule.ptr->overload_tbl) {
 589                 struct pfr_addr p;
 590                 u_int32_t       killed = 0;
 591
 592 #ifdef __FreeBSD__
 593                 V_pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
 594                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
 595 #else
 596                 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
 597                 if (pf_status.debug >= PF_DEBUG_MISC) {
 598 #endif
 599                         printf("pf_src_connlimit: blocking address ");
 600                         pf_print_host(&(*state)->src_node->addr, 0,
 601                             (*state)->key[PF_SK_WIRE]->af);
 602                 }
 603
 604                 bzero(&p, sizeof(p));
 605                 p.pfra_af = (*state)->key[PF_SK_WIRE]->af;
 606                 switch ((*state)->key[PF_SK_WIRE]->af) {
 607 #ifdef INET
 608                 case AF_INET:
 609                         p.pfra_net = 32;
 610                         p.pfra_ip4addr = (*state)->src_node->addr.v4;
 611                         break;
 612 #endif /* INET */
 613 #ifdef INET6
 614                 case AF_INET6:
 615                         p.pfra_net = 128;
 616                         p.pfra_ip6addr = (*state)->src_node->addr.v6;
 617                         break;
 618 #endif /* INET6 */
 619                 }
 620
 621                 pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
 622                     &p, time_second);
 623
 624                 /* kill existing states if that's required. */
 625                 if ((*state)->rule.ptr->flush) {
 626                         struct pf_state_key *sk;
 627                         struct pf_state *st;
 628
 629 #ifdef __FreeBSD__
 630                         V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
 631                         RB_FOREACH(st, pf_state_tree_id, &V_tree_id) {
 632 #else
 633                         pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
 634                         RB_FOREACH(st, pf_state_tree_id, &tree_id) {
 635 #endif
 636                                 sk = st->key[PF_SK_WIRE];
 637                                 /*
 638                                  * Kill states from this source.  (Only those
 639                                  * from the same rule if PF_FLUSH_GLOBAL is not
 640                                  * set)
 641                                  */
 642                                 if (sk->af ==
 643                                     (*state)->key[PF_SK_WIRE]->af &&
 644                                     (((*state)->direction == PF_OUT &&
 645                                     PF_AEQ(&(*state)->src_node->addr,
 646                                         &sk->addr[1], sk->af)) ||
 647                                     ((*state)->direction == PF_IN &&
 648                                     PF_AEQ(&(*state)->src_node->addr,
 649                                         &sk->addr[0], sk->af))) &&
 650                                     ((*state)->rule.ptr->flush &
 651                                     PF_FLUSH_GLOBAL ||
 652                                     (*state)->rule.ptr == st->rule.ptr)) {
 653                                         st->timeout = PFTM_PURGE;
 654                                         st->src.state = st->dst.state =
 655                                             TCPS_CLOSED;
 656                                         killed++;
 657                                 }
 658                         }
 659 #ifdef __FreeBSD__
 660                         if (V_pf_status.debug >= PF_DEBUG_MISC)
 661 #else
 662                         if (pf_status.debug >= PF_DEBUG_MISC)
 663 #endif
 664                                 printf(", %u states killed", killed);
 665                 }
 666 #ifdef __FreeBSD__
 667                 if (V_pf_status.debug >= PF_DEBUG_MISC)
 668 #else
 669                 if (pf_status.debug >= PF_DEBUG_MISC)
 670 #endif
 671                         printf("\n");
 672         }
 673
 674         /* kill this state */
 675         (*state)->timeout = PFTM_PURGE;
 676         (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
 677         return (1);
 678 }
 679
 680 int
 681 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 682     struct pf_addr *src, sa_family_t af)
 683 {
 684         struct pf_src_node      k;
 685
 686         if (*sn == NULL) {
 687                 k.af = af;
 688                 PF_ACPY(&k.addr, src, af);
 689                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 690                     rule->rpool.opts & PF_POOL_STICKYADDR)
 691                         k.rule.ptr = rule;
 692                 else
 693                         k.rule.ptr = NULL;
 694 #ifdef __FreeBSD__
 695                 V_pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
 696                 *sn = RB_FIND(pf_src_tree, &V_tree_src_tracking, &k);
 697 #else
 698                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
 699                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
 700 #endif
 701         }
 702         if (*sn == NULL) {
 703                 if (!rule->max_src_nodes ||
 704                     rule->src_nodes < rule->max_src_nodes)
 705 #ifdef __FreeBSD__
 706                         (*sn) = pool_get(&V_pf_src_tree_pl, PR_NOWAIT | PR_ZERO);
 707 #else
 708                         (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT | PR_ZERO);
 709 #endif
 710                 else
 711 #ifdef __FreeBSD__
 712                         V_pf_status.lcounters[LCNT_SRCNODES]++;
 713 #else
 714                         pf_status.lcounters[LCNT_SRCNODES]++;
 715 #endif
 716                 if ((*sn) == NULL)
 717                         return (-1);
 718
 719                 pf_init_threshold(&(*sn)->conn_rate,
 720                     rule->max_src_conn_rate.limit,
 721                     rule->max_src_conn_rate.seconds);
 722
 723                 (*sn)->af = af;
 724                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 725                     rule->rpool.opts & PF_POOL_STICKYADDR)
 726                         (*sn)->rule.ptr = rule;
 727                 else
 728                         (*sn)->rule.ptr = NULL;
 729                 PF_ACPY(&(*sn)->addr, src, af);
 730                 if (RB_INSERT(pf_src_tree,
 731 #ifdef __FreeBSD__
 732                     &V_tree_src_tracking, *sn) != NULL) {
 733                         if (V_pf_status.debug >= PF_DEBUG_MISC) {
 734 #else
 735                     &tree_src_tracking, *sn) != NULL) {
 736                         if (pf_status.debug >= PF_DEBUG_MISC) {
 737 #endif
 738                                 printf("pf: src_tree insert failed: ");
 739                                 pf_print_host(&(*sn)->addr, 0, af);
 740                                 printf("\n");
 741                         }
 742 #ifdef __FreeBSD__
 743                         pool_put(&V_pf_src_tree_pl, *sn);
 744 #else
 745                         pool_put(&pf_src_tree_pl, *sn);
 746 #endif
 747                         return (-1);
 748                 }
 749                 (*sn)->creation = time_second;
 750                 (*sn)->ruletype = rule->action;
 751                 if ((*sn)->rule.ptr != NULL)
 752                         (*sn)->rule.ptr->src_nodes++;
 753 #ifdef __FreeBSD__
 754                 V_pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
 755                 V_pf_status.src_nodes++;
 756 #else
 757                 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
 758                 pf_status.src_nodes++;
 759 #endif
 760         } else {
 761                 if (rule->max_src_states &&
 762                     (*sn)->states >= rule->max_src_states) {
 763 #ifdef __FreeBSD__
 764                         V_pf_status.lcounters[LCNT_SRCSTATES]++;
 765 #else
 766                         pf_status.lcounters[LCNT_SRCSTATES]++;
 767 #endif
 768                         return (-1);
 769                 }
 770         }
 771         return (0);
 772 }
 773
 774 /* state table stuff */
 775
 776 static __inline int
 777 pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b)
 778 {
 779         int     diff;
 780
 781         if ((diff = a->proto - b->proto) != 0)
 782                 return (diff);
 783         if ((diff = a->af - b->af) != 0)
 784                 return (diff);
 785         switch (a->af) {
 786 #ifdef INET
 787         case AF_INET:
 788                 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
 789                         return (1);
 790                 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
 791                         return (-1);
 792                 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
 793                         return (1);
 794                 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
 795                         return (-1);
 796                 break;
 797 #endif /* INET */
 798 #ifdef INET6
 799         case AF_INET6:
 800                 if (a->addr[0].addr32[3] > b->addr[0].addr32[3])
 801                         return (1);
 802                 if (a->addr[0].addr32[3] < b->addr[0].addr32[3])
 803                         return (-1);
 804                 if (a->addr[1].addr32[3] > b->addr[1].addr32[3])
 805                         return (1);
 806                 if (a->addr[1].addr32[3] < b->addr[1].addr32[3])
 807                         return (-1);
 808                 if (a->addr[0].addr32[2] > b->addr[0].addr32[2])
 809                         return (1);
 810                 if (a->addr[0].addr32[2] < b->addr[0].addr32[2])
 811                         return (-1);
 812                 if (a->addr[1].addr32[2] > b->addr[1].addr32[2])
 813                         return (1);
 814                 if (a->addr[1].addr32[2] < b->addr[1].addr32[2])
 815                         return (-1);
 816                 if (a->addr[0].addr32[1] > b->addr[0].addr32[1])
 817                         return (1);
 818                 if (a->addr[0].addr32[1] < b->addr[0].addr32[1])
 819                         return (-1);
 820                 if (a->addr[1].addr32[1] > b->addr[1].addr32[1])
 821                         return (1);
 822                 if (a->addr[1].addr32[1] < b->addr[1].addr32[1])
 823                         return (-1);
 824                 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
 825                         return (1);
 826                 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
 827                         return (-1);
 828                 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
 829                         return (1);
 830                 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
 831                         return (-1);
 832                 break;
 833 #endif /* INET6 */
 834         }
 835
 836         if ((diff = a->port[0] - b->port[0]) != 0)
 837                 return (diff);
 838         if ((diff = a->port[1] - b->port[1]) != 0)
 839                 return (diff);
 840
 841         return (0);
 842 }
 843
 844 static __inline int
 845 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
 846 {
 847         if (a->id > b->id)
 848                 return (1);
 849         if (a->id < b->id)
 850                 return (-1);
 851         if (a->creatorid > b->creatorid)
 852                 return (1);
 853         if (a->creatorid < b->creatorid)
 854                 return (-1);
 855
 856         return (0);
 857 }
 858
 859 int
 860 pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx)
 861 {
 862         struct pf_state_item    *si;
 863         struct pf_state_key     *cur;
 864         struct pf_state         *olds = NULL;
 865
 866 #ifdef __FreeBSD__
 867         KASSERT(s->key[idx] == NULL, ("%s: key is null!", __FUNCTION__));
 868 #else
 869         KASSERT(s->key[idx] == NULL);   /* XXX handle this? */
 870 #endif
 871
 872 #ifdef __FreeBSD__
 873         if ((cur = RB_INSERT(pf_state_tree, &V_pf_statetbl, sk)) != NULL) {
 874 #else
 875         if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl, sk)) != NULL) {
 876 #endif
 877                 /* key exists. check for same kif, if none, add to key */
 878                 TAILQ_FOREACH(si, &cur->states, entry)
 879                         if (si->s->kif == s->kif &&
 880                             si->s->direction == s->direction) {
 881                                 if (sk->proto == IPPROTO_TCP &&
 882                                     si->s->src.state >= TCPS_FIN_WAIT_2 &&
 883                                     si->s->dst.state >= TCPS_FIN_WAIT_2) {
 884                                         si->s->src.state = si->s->dst.state =
 885                                             TCPS_CLOSED;
 886                                         /* unlink late or sks can go away */
 887                                         olds = si->s;
 888                                 } else {
 889 #ifdef __FreeBSD__
 890                                         if (V_pf_status.debug >= PF_DEBUG_MISC) {
 891 #else
 892                                         if (pf_status.debug >= PF_DEBUG_MISC) {
 893 #endif
 894                                                 printf("pf: %s key attach "
 895                                                     "failed on %s: ",
 896                                                     (idx == PF_SK_WIRE) ?
 897                                                     "wire" : "stack",
 898                                                     s->kif->pfik_name);
 899                                                 pf_print_state_parts(s,
 900                                                     (idx == PF_SK_WIRE) ?
 901                                                     sk : NULL,
 902                                                     (idx == PF_SK_STACK) ?
 903                                                     sk : NULL);
 904                                                 printf(", existing: ");
 905                                                 pf_print_state_parts(si->s,
 906                                                     (idx == PF_SK_WIRE) ?
 907                                                     sk : NULL,
 908                                                     (idx == PF_SK_STACK) ?
 909                                                     sk : NULL);
 910                                                 printf("\n");
 911                                         }
 912 #ifdef __FreeBSD__
 913                                         pool_put(&V_pf_state_key_pl, sk);
 914 #else
 915                                         pool_put(&pf_state_key_pl, sk);
 916 #endif
 917                                         return (-1);    /* collision! */
 918                                 }
 919                         }
 920 #ifdef __FreeBSD__
 921                 pool_put(&V_pf_state_key_pl, sk);
 922 #else
 923                 pool_put(&pf_state_key_pl, sk);
 924 #endif
 925                 s->key[idx] = cur;
 926         } else
 927                 s->key[idx] = sk;
 928
 929 #ifdef __FreeBSD__
 930         if ((si = pool_get(&V_pf_state_item_pl, PR_NOWAIT)) == NULL) {
 931 #else
 932         if ((si = pool_get(&pf_state_item_pl, PR_NOWAIT)) == NULL) {
 933 #endif
 934                 pf_state_key_detach(s, idx);
 935                 return (-1);
 936         }
 937         si->s = s;
 938
 939         /* list is sorted, if-bound states before floating */
 940 #ifdef __FreeBSD__
 941         if (s->kif == V_pfi_all)
 942 #else
 943         if (s->kif == pfi_all)
 944 #endif
 945                 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry);
 946         else
 947                 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry);
 948
 949         if (olds)
 950                 pf_unlink_state(olds);
 951
 952         return (0);
 953 }
 954
 955 void
 956 pf_detach_state(struct pf_state *s)
 957 {
 958         if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK])
 959                 s->key[PF_SK_WIRE] = NULL;
 960
 961         if (s->key[PF_SK_STACK] != NULL)
 962                 pf_state_key_detach(s, PF_SK_STACK);
 963
 964         if (s->key[PF_SK_WIRE] != NULL)
 965                 pf_state_key_detach(s, PF_SK_WIRE);
 966 }
 967
 968 void
 969 pf_state_key_detach(struct pf_state *s, int idx)
 970 {
 971         struct pf_state_item    *si;
 972
 973         si = TAILQ_FIRST(&s->key[idx]->states);
 974         while (si && si->s != s)
 975             si = TAILQ_NEXT(si, entry);
 976
 977         if (si) {
 978                 TAILQ_REMOVE(&s->key[idx]->states, si, entry);
 979 #ifdef __FreeBSD__
 980                 pool_put(&V_pf_state_item_pl, si);
 981 #else
 982                 pool_put(&pf_state_item_pl, si);
 983 #endif
 984         }
 985
 986         if (TAILQ_EMPTY(&s->key[idx]->states)) {
 987 #ifdef __FreeBSD__
 988                 RB_REMOVE(pf_state_tree, &V_pf_statetbl, s->key[idx]);
 989 #else
 990                 RB_REMOVE(pf_state_tree, &pf_statetbl, s->key[idx]);
 991 #endif
 992                 if (s->key[idx]->reverse)
 993                         s->key[idx]->reverse->reverse = NULL;
 994 #ifdef __FreeBSD__
 995         /* XXX: implement this */
 996 #else
 997                 if (s->key[idx]->inp)
 998                         s->key[idx]->inp->inp_pf_sk = NULL;
 999 #endif
1000 #ifdef __FreeBSD__
1001                 pool_put(&V_pf_state_key_pl, s->key[idx]);
1002 #else
1003                 pool_put(&pf_state_key_pl, s->key[idx]);
1004 #endif
1005         }
1006         s->key[idx] = NULL;
1007 }
1008
1009 struct pf_state_key *
1010 pf_alloc_state_key(int pool_flags)
1011 {
1012         struct pf_state_key     *sk;
1013
1014 #ifdef __FreeBSD__
1015         if ((sk = pool_get(&V_pf_state_key_pl, pool_flags)) == NULL)
1016 #else
1017         if ((sk = pool_get(&pf_state_key_pl, pool_flags)) == NULL)
1018 #endif
1019                 return (NULL);
1020         TAILQ_INIT(&sk->states);
1021
1022         return (sk);
1023 }
1024
1025 int
1026 pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr,
1027         struct pf_state_key **skw, struct pf_state_key **sks,
1028         struct pf_state_key **skp, struct pf_state_key **nkp,
1029         struct pf_addr *saddr, struct pf_addr *daddr,
1030         u_int16_t sport, u_int16_t dport)
1031 {
1032 #ifdef __FreeBSD__
1033         KASSERT((*skp == NULL && *nkp == NULL),
1034                 ("%s: skp == NULL && nkp == NULL", __FUNCTION__));
1035 #else
1036         KASSERT((*skp == NULL && *nkp == NULL));
1037 #endif
1038
1039         if ((*skp = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL)
1040                 return (ENOMEM);
1041
1042         PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af);
1043         PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af);
1044         (*skp)->port[pd->sidx] = sport;
1045         (*skp)->port[pd->didx] = dport;
1046         (*skp)->proto = pd->proto;
1047         (*skp)->af = pd->af;
1048
1049         if (nr != NULL) {
1050                 if ((*nkp = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL)
1051                         return (ENOMEM); /* caller must handle cleanup */
1052
1053                 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */
1054                 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af);
1055                 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af);
1056                 (*nkp)->port[0] = (*skp)->port[0];
1057                 (*nkp)->port[1] = (*skp)->port[1];
1058                 (*nkp)->proto = pd->proto;
1059                 (*nkp)->af = pd->af;
1060         } else
1061                 *nkp = *skp;
1062
1063         if (pd->dir == PF_IN) {
1064                 *skw = *skp;
1065                 *sks = *nkp;
1066         } else {
1067                 *sks = *skp;
1068                 *skw = *nkp;
1069         }
1070         return (0);
1071 }
1072
1073
1074 int
1075 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
1076     struct pf_state_key *sks, struct pf_state *s)
1077 {
1078 #ifndef __FreeBSD__
1079         splassert(IPL_SOFTNET);
1080 #endif
1081
1082         s->kif = kif;
1083
1084         if (skw == sks) {
1085                 if (pf_state_key_attach(skw, s, PF_SK_WIRE))
1086                         return (-1);
1087                 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
1088         } else {
1089                 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) {
1090 #ifdef __FreeBSD__
1091                         pool_put(&V_pf_state_key_pl, sks);
1092 #else
1093                         pool_put(&pf_state_key_pl, sks);
1094 #endif
1095                         return (-1);
1096                 }
1097                 if (pf_state_key_attach(sks, s, PF_SK_STACK)) {
1098                         pf_state_key_detach(s, PF_SK_WIRE);
1099                         return (-1);
1100                 }
1101         }
1102
1103         if (s->id == 0 && s->creatorid == 0) {
1104 #ifdef __FreeBSD__
1105                 s->id = htobe64(V_pf_status.stateid++);
1106                 s->creatorid = V_pf_status.hostid;
1107 #else
1108                 s->id = htobe64(pf_status.stateid++);
1109                 s->creatorid = pf_status.hostid;
1110 #endif
1111         }
1112 #ifdef __FreeBSD__
1113         if (RB_INSERT(pf_state_tree_id, &V_tree_id, s) != NULL) {
1114                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1115 #else
1116         if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) {
1117                 if (pf_status.debug >= PF_DEBUG_MISC) {
1118 #endif
1119                         printf("pf: state insert failed: "
1120                             "id: %016llx creatorid: %08x",
1121 #ifdef __FreeBSD__
1122                             (unsigned long long)betoh64(s->id), ntohl(s->creatorid));
1123 #else
1124                             betoh64(s->id), ntohl(s->creatorid));
1125 #endif
1126                         printf("\n");
1127                 }
1128                 pf_detach_state(s);
1129                 return (-1);
1130         }
1131 #ifdef __FreeBSD__
1132         TAILQ_INSERT_TAIL(&V_state_list, s, entry_list);
1133         V_pf_status.fcounters[FCNT_STATE_INSERT]++;
1134         V_pf_status.states++;
1135 #else
1136         TAILQ_INSERT_TAIL(&state_list, s, entry_list);
1137         pf_status.fcounters[FCNT_STATE_INSERT]++;
1138         pf_status.states++;
1139 #endif
1140         pfi_kif_ref(kif, PFI_KIF_REF_STATE);
1141 #if NPFSYNC > 0
1142 #ifdef __FreeBSD__
1143         if (pfsync_insert_state_ptr != NULL)
1144                 pfsync_insert_state_ptr(s);
1145 #else
1146         pfsync_insert_state(s);
1147 #endif
1148 #endif
1149         return (0);
1150 }
1151
1152 struct pf_state *
1153 pf_find_state_byid(struct pf_state_cmp *key)
1154 {
1155 #ifdef __FreeBSD__
1156         V_pf_status.fcounters[FCNT_STATE_SEARCH]++;
1157
1158         return (RB_FIND(pf_state_tree_id, &V_tree_id, (struct pf_state *)key));
1159 #else
1160         pf_status.fcounters[FCNT_STATE_SEARCH]++;
1161
1162         return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
1163 #endif
1164 }
1165
1166 /* XXX debug function, intended to be removed one day */
1167 int
1168 pf_compare_state_keys(struct pf_state_key *a, struct pf_state_key *b,
1169     struct pfi_kif *kif, u_int dir)
1170 {
1171         /* a (from hdr) and b (new) must be exact opposites of each other */
1172         if (a->af == b->af && a->proto == b->proto &&
1173             PF_AEQ(&a->addr[0], &b->addr[1], a->af) &&
1174             PF_AEQ(&a->addr[1], &b->addr[0], a->af) &&
1175             a->port[0] == b->port[1] &&
1176             a->port[1] == b->port[0])
1177                 return (0);
1178         else {
1179                 /* mismatch. must not happen. */
1180                 printf("pf: state key linking mismatch! dir=%s, "
1181                     "if=%s, stored af=%u, a0: ",
1182                     dir == PF_OUT ? "OUT" : "IN", kif->pfik_name, a->af);
1183                 pf_print_host(&a->addr[0], a->port[0], a->af);
1184                 printf(", a1: ");
1185                 pf_print_host(&a->addr[1], a->port[1], a->af);
1186                 printf(", proto=%u", a->proto);
1187                 printf(", found af=%u, a0: ", b->af);
1188                 pf_print_host(&b->addr[0], b->port[0], b->af);
1189                 printf(", a1: ");
1190                 pf_print_host(&b->addr[1], b->port[1], b->af);
1191                 printf(", proto=%u", b->proto);
1192                 printf(".\n");
1193                 return (-1);
1194         }
1195 }
1196
1197 struct pf_state *
1198 #ifdef __FreeBSD__
1199 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir,
1200     struct mbuf *m, struct pf_mtag *pftag)
1201 #else
1202 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir,
1203     struct mbuf *m)
1204 #endif
1205 {
1206         struct pf_state_key     *sk;
1207         struct pf_state_item    *si;
1208
1209 #ifdef __FreeBSD__
1210         V_pf_status.fcounters[FCNT_STATE_SEARCH]++;
1211 #else
1212         pf_status.fcounters[FCNT_STATE_SEARCH]++;
1213 #endif
1214
1215 #ifdef __FreeBSD__
1216         if (dir == PF_OUT && pftag->statekey &&
1217             ((struct pf_state_key *)pftag->statekey)->reverse)
1218                 sk = ((struct pf_state_key *)pftag->statekey)->reverse;
1219         else {
1220 #ifdef __FreeBSD__
1221                 if ((sk = RB_FIND(pf_state_tree, &V_pf_statetbl,
1222 #else
1223                 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl,
1224 #endif
1225                     (struct pf_state_key *)key)) == NULL)
1226                         return (NULL);
1227                 if (dir == PF_OUT && pftag->statekey &&
1228                     pf_compare_state_keys(pftag->statekey, sk,
1229                     kif, dir) == 0) {
1230                         ((struct pf_state_key *)
1231                             pftag->statekey)->reverse = sk;
1232                         sk->reverse = pftag->statekey;
1233                 }
1234         }
1235 #else
1236         if (dir == PF_OUT && m->m_pkthdr.pf.statekey &&
1237             ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse)
1238                 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse;
1239         else {
1240 #ifdef __FreeBSD__
1241                 if ((sk = RB_FIND(pf_state_tree, &V_pf_statetbl,
1242 #else
1243                 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl,
1244 #endif
1245                     (struct pf_state_key *)key)) == NULL)
1246                         return (NULL);
1247                 if (dir == PF_OUT && m->m_pkthdr.pf.statekey &&
1248                     pf_compare_state_keys(m->m_pkthdr.pf.statekey, sk,
1249                     kif, dir) == 0) {
1250                         ((struct pf_state_key *)
1251                             m->m_pkthdr.pf.statekey)->reverse = sk;
1252                         sk->reverse = m->m_pkthdr.pf.statekey;
1253                 }
1254         }
1255 #endif
1256
1257         if (dir == PF_OUT)
1258 #ifdef __FreeBSD__
1259                 pftag->statekey = NULL;
1260 #else
1261                 m->m_pkthdr.pf.statekey = NULL;
1262 #endif
1263
1264         /* list is sorted, if-bound states before floating ones */
1265         TAILQ_FOREACH(si, &sk->states, entry)
1266 #ifdef __FreeBSD__
1267                 if ((si->s->kif == V_pfi_all || si->s->kif == kif) &&
1268 #else
1269                 if ((si->s->kif == pfi_all || si->s->kif == kif) &&
1270 #endif
1271                     sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
1272                     si->s->key[PF_SK_STACK]))
1273                         return (si->s);
1274
1275         return (NULL);
1276 }
1277
1278 struct pf_state *
1279 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
1280 {
1281         struct pf_state_key     *sk;
1282         struct pf_state_item    *si, *ret = NULL;
1283
1284 #ifdef __FreeBSD__
1285         V_pf_status.fcounters[FCNT_STATE_SEARCH]++;
1286 #else
1287         pf_status.fcounters[FCNT_STATE_SEARCH]++;
1288 #endif
1289
1290 #ifdef __FreeBSD__
1291         sk = RB_FIND(pf_state_tree, &V_pf_statetbl, (struct pf_state_key *)key);
1292 #else
1293         sk = RB_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key);
1294 #endif
1295         if (sk != NULL) {
1296                 TAILQ_FOREACH(si, &sk->states, entry)
1297                         if (dir == PF_INOUT ||
1298                             (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
1299                             si->s->key[PF_SK_STACK]))) {
1300                                 if (more == NULL)
1301                                         return (si->s);
1302
1303                                 if (ret)
1304                                         (*more)++;
1305                                 else
1306                                         ret = si;
1307                         }
1308         }
1309         return (ret ? ret->s : NULL);
1310 }
1311
1312 /* END state table stuff */
1313
1314
1315 void
1316 pf_purge_thread(void *v)
1317 {
1318         int nloops = 0, s;
1319 #ifdef __FreeBSD__
1320         int locked;
1321 #endif
1322
1323         CURVNET_SET((struct vnet *)v);
1324
1325         for (;;) {
1326                 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz);
1327
1328 #ifdef __FreeBSD__
1329                 sx_slock(&V_pf_consistency_lock);
1330                 PF_LOCK();
1331                 locked = 0;
1332
1333                 if (V_pf_end_threads) {
1334                         PF_UNLOCK();
1335                         sx_sunlock(&V_pf_consistency_lock);
1336                         sx_xlock(&V_pf_consistency_lock);
1337                         PF_LOCK();
1338
1339                         pf_purge_expired_states(V_pf_status.states, 1);
1340                         pf_purge_expired_fragments();
1341                         pf_purge_expired_src_nodes(1);
1342                         V_pf_end_threads++;
1343
1344                         sx_xunlock(&V_pf_consistency_lock);
1345                         PF_UNLOCK();
1346                         wakeup(pf_purge_thread);
1347                         kproc_exit(0);
1348                 }
1349 #endif
1350                 s = splsoftnet();
1351
1352                 /* process a fraction of the state table every second */
1353 #ifdef __FreeBSD__
1354                 if (!pf_purge_expired_states(1 + (V_pf_status.states /
1355                     V_pf_default_rule.timeout[PFTM_INTERVAL]), 0)) {
1356                         PF_UNLOCK();
1357                         sx_sunlock(&V_pf_consistency_lock);
1358                         sx_xlock(&V_pf_consistency_lock);
1359                         PF_LOCK();
1360                         locked = 1;
1361
1362                         pf_purge_expired_states(1 + (V_pf_status.states /
1363                             V_pf_default_rule.timeout[PFTM_INTERVAL]), 1);
1364                 }
1365 #else
1366                 pf_purge_expired_states(1 + (pf_status.states
1367                     / pf_default_rule.timeout[PFTM_INTERVAL]));
1368 #endif
1369
1370                 /* purge other expired types every PFTM_INTERVAL seconds */
1371 #ifdef __FreeBSD__
1372                 if (++nloops >= V_pf_default_rule.timeout[PFTM_INTERVAL]) {
1373 #else
1374                 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
1375 #endif
1376                         pf_purge_expired_fragments();
1377                         pf_purge_expired_src_nodes(0);
1378                         nloops = 0;
1379                 }
1380
1381                 splx(s);
1382 #ifdef __FreeBSD__
1383                 PF_UNLOCK();
1384                 if (locked)
1385                         sx_xunlock(&V_pf_consistency_lock);
1386                 else
1387                         sx_sunlock(&V_pf_consistency_lock);
1388 #endif
1389         }
1390         CURVNET_RESTORE();
1391 }
1392
1393 u_int32_t
1394 pf_state_expires(const struct pf_state *state)
1395 {
1396         u_int32_t       timeout;
1397         u_int32_t       start;
1398         u_int32_t       end;
1399         u_int32_t       states;
1400
1401         /* handle all PFTM_* > PFTM_MAX here */
1402         if (state->timeout == PFTM_PURGE)
1403                 return (time_second);
1404         if (state->timeout == PFTM_UNTIL_PACKET)
1405                 return (0);
1406 #ifdef __FreeBSD__
1407         KASSERT(state->timeout != PFTM_UNLINKED,
1408             ("pf_state_expires: timeout == PFTM_UNLINKED"));
1409         KASSERT((state->timeout < PFTM_MAX),
1410             ("pf_state_expires: timeout > PFTM_MAX"));
1411 #else
1412         KASSERT(state->timeout != PFTM_UNLINKED);
1413         KASSERT(state->timeout < PFTM_MAX);
1414 #endif
1415         timeout = state->rule.ptr->timeout[state->timeout];
1416         if (!timeout)
1417 #ifdef __FreeBSD__
1418                 timeout = V_pf_default_rule.timeout[state->timeout];
1419 #else
1420                 timeout = pf_default_rule.timeout[state->timeout];
1421 #endif
1422         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1423         if (start) {
1424                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1425                 states = state->rule.ptr->states_cur;
1426         } else {
1427 #ifdef __FreeBSD__
1428                 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1429                 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1430                 states = V_pf_status.states;
1431 #else
1432                 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1433                 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1434                 states = pf_status.states;
1435 #endif
1436         }
1437         if (end && states > start && start < end) {
1438                 if (states < end)
1439                         return (state->expire + timeout * (end - states) /
1440                             (end - start));
1441                 else
1442                         return (time_second);
1443         }
1444         return (state->expire + timeout);
1445 }
1446
1447 #ifdef __FreeBSD__
1448 int
1449 pf_purge_expired_src_nodes(int waslocked)
1450 #else
1451 void
1452 pf_purge_expired_src_nodes(int waslocked)
1453 #endif
1454 {
1455         struct pf_src_node              *cur, *next;
1456         int                              locked = waslocked;
1457
1458 #ifdef __FreeBSD__
1459         for (cur = RB_MIN(pf_src_tree, &V_tree_src_tracking); cur; cur = next) {
1460         next = RB_NEXT(pf_src_tree, &V_tree_src_tracking, cur);
1461 #else
1462         for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
1463         next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
1464 #endif
1465
1466                 if (cur->states <= 0 && cur->expire <= time_second) {
1467                         if (! locked) {
1468 #ifdef __FreeBSD__
1469                                 if (!sx_try_upgrade(&V_pf_consistency_lock))
1470                                         return (0);
1471 #else
1472                                 rw_enter_write(&pf_consistency_lock);
1473 #endif
1474                                 next = RB_NEXT(pf_src_tree,
1475 #ifdef __FreeBSD__
1476                                     &V_tree_src_tracking, cur);
1477 #else
1478                                     &tree_src_tracking, cur);
1479 #endif
1480                                 locked = 1;
1481                         }
1482                         if (cur->rule.ptr != NULL) {
1483                                 cur->rule.ptr->src_nodes--;
1484                                 if (cur->rule.ptr->states_cur <= 0 &&
1485                                     cur->rule.ptr->max_src_nodes <= 0)
1486                                         pf_rm_rule(NULL, cur->rule.ptr);
1487                         }
1488 #ifdef __FreeBSD__
1489                         RB_REMOVE(pf_src_tree, &V_tree_src_tracking, cur);
1490                         V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
1491                         V_pf_status.src_nodes--;
1492                         pool_put(&V_pf_src_tree_pl, cur);
1493 #else
1494                         RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
1495                         pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
1496                         pf_status.src_nodes--;
1497                         pool_put(&pf_src_tree_pl, cur);
1498 #endif
1499                 }
1500         }
1501
1502         if (locked && !waslocked)
1503 #ifdef __FreeBSD__
1504         {
1505                 sx_downgrade(&V_pf_consistency_lock);
1506         }
1507         return (1);
1508 #else
1509                 rw_exit_write(&pf_consistency_lock);
1510 #endif
1511 }
1512
1513 void
1514 pf_src_tree_remove_state(struct pf_state *s)
1515 {
1516         u_int32_t timeout;
1517
1518         if (s->src_node != NULL) {
1519                 if (s->src.tcp_est)
1520                         --s->src_node->conn;
1521                 if (--s->src_node->states <= 0) {
1522                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1523                         if (!timeout)
1524                                 timeout =
1525 #ifdef __FreeBSD__
1526                                     V_pf_default_rule.timeout[PFTM_SRC_NODE];
1527 #else
1528                                     pf_default_rule.timeout[PFTM_SRC_NODE];
1529 #endif
1530                         s->src_node->expire = time_second + timeout;
1531                 }
1532         }
1533         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1534                 if (--s->nat_src_node->states <= 0) {
1535                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1536                         if (!timeout)
1537                                 timeout =
1538 #ifdef __FreeBSD__
1539                                     V_pf_default_rule.timeout[PFTM_SRC_NODE];
1540 #else
1541                                     pf_default_rule.timeout[PFTM_SRC_NODE];
1542 #endif
1543                         s->nat_src_node->expire = time_second + timeout;
1544                 }
1545         }
1546         s->src_node = s->nat_src_node = NULL;
1547 }
1548
1549 /* callers should be at splsoftnet */
1550 void
1551 pf_unlink_state(struct pf_state *cur)
1552 {
1553 #ifdef __FreeBSD__
1554         if (cur->local_flags & PFSTATE_EXPIRING)
1555                 return;
1556         cur->local_flags |= PFSTATE_EXPIRING;
1557 #else
1558         splassert(IPL_SOFTNET);
1559 #endif
1560
1561         if (cur->src.state == PF_TCPS_PROXY_DST) {
1562                 /* XXX wire key the right one? */
1563 #ifdef __FreeBSD__
1564                 pf_send_tcp(NULL, cur->rule.ptr, cur->key[PF_SK_WIRE]->af,
1565 #else
1566                 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af,
1567 #endif
1568                     &cur->key[PF_SK_WIRE]->addr[1],
1569                     &cur->key[PF_SK_WIRE]->addr[0],
1570                     cur->key[PF_SK_WIRE]->port[1],
1571                     cur->key[PF_SK_WIRE]->port[0],
1572                     cur->src.seqhi, cur->src.seqlo + 1,
1573                     TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
1574         }
1575 #ifdef __FreeBSD__
1576         RB_REMOVE(pf_state_tree_id, &V_tree_id, cur);
1577 #else
1578         RB_REMOVE(pf_state_tree_id, &tree_id, cur);
1579 #endif
1580 #if NPFLOW > 0
1581         if (cur->state_flags & PFSTATE_PFLOW)
1582 #ifdef __FreeBSD__
1583                 if (export_pflow_ptr != NULL)
1584                         export_pflow_ptr(cur);
1585 #else
1586                 export_pflow(cur);
1587 #endif
1588 #endif
1589 #if NPFSYNC > 0
1590 #ifdef __FreeBSD__
1591         if (pfsync_delete_state_ptr != NULL)
1592                 pfsync_delete_state_ptr(cur);
1593 #else
1594         pfsync_delete_state(cur);
1595 #endif
1596 #endif
1597         cur->timeout = PFTM_UNLINKED;
1598         pf_src_tree_remove_state(cur);
1599         pf_detach_state(cur);
1600 }
1601
1602 /* callers should be at splsoftnet and hold the
1603  * write_lock on pf_consistency_lock */
1604 void
1605 pf_free_state(struct pf_state *cur)
1606 {
1607 #ifndef __FreeBSD__
1608         splassert(IPL_SOFTNET);
1609 #endif
1610
1611 #if NPFSYNC > 0
1612 #ifdef __FreeBSD__
1613         if (pfsync_state_in_use_ptr != NULL &&
1614                 pfsync_state_in_use_ptr(cur))
1615 #else
1616         if (pfsync_state_in_use(cur))
1617 #endif
1618                 return;
1619 #endif
1620 #ifdef __FreeBSD__
1621         KASSERT(cur->timeout == PFTM_UNLINKED,
1622             ("pf_free_state: cur->timeout != PFTM_UNLINKED"));
1623 #else
1624         KASSERT(cur->timeout == PFTM_UNLINKED);
1625 #endif
1626         if (--cur->rule.ptr->states_cur <= 0 &&
1627             cur->rule.ptr->src_nodes <= 0)
1628                 pf_rm_rule(NULL, cur->rule.ptr);
1629         if (cur->nat_rule.ptr != NULL)
1630                 if (--cur->nat_rule.ptr->states_cur <= 0 &&
1631                         cur->nat_rule.ptr->src_nodes <= 0)
1632                         pf_rm_rule(NULL, cur->nat_rule.ptr);
1633         if (cur->anchor.ptr != NULL)
1634                 if (--cur->anchor.ptr->states_cur <= 0)
1635                         pf_rm_rule(NULL, cur->anchor.ptr);
1636         pf_normalize_tcp_cleanup(cur);
1637         pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE);
1638 #ifdef __FreeBSD__
1639         TAILQ_REMOVE(&V_state_list, cur, entry_list);
1640 #else
1641         TAILQ_REMOVE(&state_list, cur, entry_list);
1642 #endif
1643         if (cur->tag)
1644                 pf_tag_unref(cur->tag);
1645 #ifdef __FreeBSD__
1646         pool_put(&V_pf_state_pl, cur);
1647         V_pf_status.fcounters[FCNT_STATE_REMOVALS]++;
1648         V_pf_status.states--;
1649 #else
1650         pool_put(&pf_state_pl, cur);
1651         pf_status.fcounters[FCNT_STATE_REMOVALS]++;
1652         pf_status.states--;
1653 #endif
1654 }
1655
1656 #ifdef __FreeBSD__
1657 int
1658 pf_purge_expired_states(u_int32_t maxcheck, int waslocked)
1659 #else
1660 void
1661 pf_purge_expired_states(u_int32_t maxcheck)
1662 #endif
1663 {
1664         static struct pf_state  *cur = NULL;
1665         struct pf_state         *next;
1666 #ifdef __FreeBSD__
1667         int                      locked = waslocked;
1668 #else
1669         int                      locked = 0;
1670 #endif
1671
1672         while (maxcheck--) {
1673                 /* wrap to start of list when we hit the end */
1674                 if (cur == NULL) {
1675 #ifdef __FreeBSD__
1676                         cur = TAILQ_FIRST(&V_state_list);
1677 #else
1678                         cur = TAILQ_FIRST(&state_list);
1679 #endif
1680                         if (cur == NULL)
1681                                 break;  /* list empty */
1682                 }
1683
1684                 /* get next state, as cur may get deleted */
1685                 next = TAILQ_NEXT(cur, entry_list);
1686
1687                 if (cur->timeout == PFTM_UNLINKED) {
1688                         /* free unlinked state */
1689                         if (! locked) {
1690 #ifdef __FreeBSD__
1691                                 if (!sx_try_upgrade(&V_pf_consistency_lock))
1692                                         return (0);
1693 #else
1694                                 rw_enter_write(&pf_consistency_lock);
1695 #endif
1696                                 locked = 1;
1697                         }
1698                         pf_free_state(cur);
1699                 } else if (pf_state_expires(cur) <= time_second) {
1700                         /* unlink and free expired state */
1701                         pf_unlink_state(cur);
1702                         if (! locked) {
1703 #ifdef __FreeBSD__
1704                                 if (!sx_try_upgrade(&V_pf_consistency_lock))
1705                                         return (0);
1706 #else
1707                                 rw_enter_write(&pf_consistency_lock);
1708 #endif
1709                                 locked = 1;
1710                         }
1711                         pf_free_state(cur);
1712                 }
1713                 cur = next;
1714         }
1715
1716 #ifdef __FreeBSD__
1717         if (!waslocked && locked)
1718                 sx_downgrade(&V_pf_consistency_lock);
1719
1720         return (1);
1721 #else
1722         if (locked)
1723                 rw_exit_write(&pf_consistency_lock);
1724 #endif
1725 }
1726
1727 int
1728 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
1729 {
1730         if (aw->type != PF_ADDR_TABLE)
1731                 return (0);
1732         if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname, 1)) == NULL)
1733                 return (1);
1734         return (0);
1735 }
1736
1737 void
1738 pf_tbladdr_remove(struct pf_addr_wrap *aw)
1739 {
1740         if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
1741                 return;
1742         pfr_detach_table(aw->p.tbl);
1743         aw->p.tbl = NULL;
1744 }
1745
1746 void
1747 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
1748 {
1749         struct pfr_ktable *kt = aw->p.tbl;
1750
1751         if (aw->type != PF_ADDR_TABLE || kt == NULL)
1752                 return;
1753         if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
1754                 kt = kt->pfrkt_root;
1755         aw->p.tbl = NULL;
1756         aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
1757                 kt->pfrkt_cnt : -1;
1758 }
1759
1760 void
1761 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1762 {
1763         switch (af) {
1764 #ifdef INET
1765         case AF_INET: {
1766                 u_int32_t a = ntohl(addr->addr32[0]);
1767                 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1768                     (a>>8)&255, a&255);
1769                 if (p) {
1770                         p = ntohs(p);
1771                         printf(":%u", p);
1772                 }
1773                 break;
1774         }
1775 #endif /* INET */
1776 #ifdef INET6
1777         case AF_INET6: {
1778                 u_int16_t b;
1779                 u_int8_t i, curstart, curend, maxstart, maxend;
1780                 curstart = curend = maxstart = maxend = 255;
1781                 for (i = 0; i < 8; i++) {
1782                         if (!addr->addr16[i]) {
1783                                 if (curstart == 255)
1784                                         curstart = i;
1785                                 curend = i;
1786                         } else {
1787                                 if ((curend - curstart) >
1788                                     (maxend - maxstart)) {
1789                                         maxstart = curstart;
1790                                         maxend = curend;
1791                                 }
1792                                 curstart = curend = 255;
1793                         }
1794                 }
1795                 if ((curend - curstart) >
1796                     (maxend - maxstart)) {
1797                         maxstart = curstart;
1798                         maxend = curend;
1799                 }
1800                 for (i = 0; i < 8; i++) {
1801                         if (i >= maxstart && i <= maxend) {
1802                                 if (i == 0)
1803                                         printf(":");
1804                                 if (i == maxend)
1805                                         printf(":");
1806                         } else {
1807                                 b = ntohs(addr->addr16[i]);
1808                                 printf("%x", b);
1809                                 if (i < 7)
1810                                         printf(":");
1811                         }
1812                 }
1813                 if (p) {
1814                         p = ntohs(p);
1815                         printf("[%u]", p);
1816                 }
1817                 break;
1818         }
1819 #endif /* INET6 */
1820         }
1821 }
1822
1823 void
1824 pf_print_state(struct pf_state *s)
1825 {
1826         pf_print_state_parts(s, NULL, NULL);
1827 }
1828
1829 void
1830 pf_print_state_parts(struct pf_state *s,
1831     struct pf_state_key *skwp, struct pf_state_key *sksp)
1832 {
1833         struct pf_state_key *skw, *sks;
1834         u_int8_t proto, dir;
1835
1836         /* Do our best to fill these, but they're skipped if NULL */
1837         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1838         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1839         proto = skw ? skw->proto : (sks ? sks->proto : 0);
1840         dir = s ? s->direction : 0;
1841
1842         switch (proto) {
1843         case IPPROTO_IPV4:
1844                 printf("IPv4");
1845                 break;
1846         case IPPROTO_IPV6:
1847                 printf("IPv6");
1848                 break;
1849         case IPPROTO_TCP:
1850                 printf("TCP");
1851                 break;
1852         case IPPROTO_UDP:
1853                 printf("UDP");
1854                 break;
1855         case IPPROTO_ICMP:
1856                 printf("ICMP");
1857                 break;
1858         case IPPROTO_ICMPV6:
1859                 printf("ICMPv6");
1860                 break;
1861         default:
1862                 printf("%u", skw->proto);
1863                 break;
1864         }
1865         switch (dir) {
1866         case PF_IN:
1867                 printf(" in");
1868                 break;
1869         case PF_OUT:
1870                 printf(" out");
1871                 break;
1872         }
1873         if (skw) {
1874                 printf(" wire: ");
1875                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1876                 printf(" ");
1877                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1878         }
1879         if (sks) {
1880                 printf(" stack: ");
1881                 if (sks != skw) {
1882                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1883                         printf(" ");
1884                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1885                 } else
1886                         printf("-");
1887         }
1888         if (s) {
1889                 if (proto == IPPROTO_TCP) {
1890                         printf(" [lo=%u high=%u win=%u modulator=%u",
1891                             s->src.seqlo, s->src.seqhi,
1892                             s->src.max_win, s->src.seqdiff);
1893                         if (s->src.wscale && s->dst.wscale)
1894                                 printf(" wscale=%u",
1895                                     s->src.wscale & PF_WSCALE_MASK);
1896                         printf("]");
1897                         printf(" [lo=%u high=%u win=%u modulator=%u",
1898                             s->dst.seqlo, s->dst.seqhi,
1899                             s->dst.max_win, s->dst.seqdiff);
1900                         if (s->src.wscale && s->dst.wscale)
1901                                 printf(" wscale=%u",
1902                                 s->dst.wscale & PF_WSCALE_MASK);
1903                         printf("]");
1904                 }
1905                 printf(" %u:%u", s->src.state, s->dst.state);
1906         }
1907 }
1908
1909 void
1910 pf_print_flags(u_int8_t f)
1911 {
1912         if (f)
1913                 printf(" ");
1914         if (f & TH_FIN)
1915                 printf("F");
1916         if (f & TH_SYN)
1917                 printf("S");
1918         if (f & TH_RST)
1919                 printf("R");
1920         if (f & TH_PUSH)
1921                 printf("P");
1922         if (f & TH_ACK)
1923                 printf("A");
1924         if (f & TH_URG)
1925                 printf("U");
1926         if (f & TH_ECE)
1927                 printf("E");
1928         if (f & TH_CWR)
1929                 printf("W");
1930 }
1931
1932 #define PF_SET_SKIP_STEPS(i)                                    \
1933         do {                                                    \
1934                 while (head[i] != cur) {                        \
1935                         head[i]->skip[i].ptr = cur;             \
1936                         head[i] = TAILQ_NEXT(head[i], entries); \
1937                 }                                               \
1938         } while (0)
1939
1940 void
1941 pf_calc_skip_steps(struct pf_rulequeue *rules)
1942 {
1943         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1944         int i;
1945
1946         cur = TAILQ_FIRST(rules);
1947         prev = cur;
1948         for (i = 0; i < PF_SKIP_COUNT; ++i)
1949                 head[i] = cur;
1950         while (cur != NULL) {
1951
1952                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1953                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1954                 if (cur->direction != prev->direction)
1955                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1956                 if (cur->af != prev->af)
1957                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
1958                 if (cur->proto != prev->proto)
1959                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1960                 if (cur->src.neg != prev->src.neg ||
1961                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1962                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1963                 if (cur->src.port[0] != prev->src.port[0] ||
1964                     cur->src.port[1] != prev->src.port[1] ||
1965                     cur->src.port_op != prev->src.port_op)
1966                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1967                 if (cur->dst.neg != prev->dst.neg ||
1968                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1969                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1970                 if (cur->dst.port[0] != prev->dst.port[0] ||
1971                     cur->dst.port[1] != prev->dst.port[1] ||
1972                     cur->dst.port_op != prev->dst.port_op)
1973                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1974
1975                 prev = cur;
1976                 cur = TAILQ_NEXT(cur, entries);
1977         }
1978         for (i = 0; i < PF_SKIP_COUNT; ++i)
1979                 PF_SET_SKIP_STEPS(i);
1980 }
1981
1982 int
1983 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1984 {
1985         if (aw1->type != aw2->type)
1986                 return (1);
1987         switch (aw1->type) {
1988         case PF_ADDR_ADDRMASK:
1989         case PF_ADDR_RANGE:
1990                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1991                         return (1);
1992                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1993                         return (1);
1994                 return (0);
1995         case PF_ADDR_DYNIFTL:
1996                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1997         case PF_ADDR_NOROUTE:
1998         case PF_ADDR_URPFFAILED:
1999                 return (0);
2000         case PF_ADDR_TABLE:
2001                 return (aw1->p.tbl != aw2->p.tbl);
2002         case PF_ADDR_RTLABEL:
2003                 return (aw1->v.rtlabel != aw2->v.rtlabel);
2004         default:
2005                 printf("invalid address type: %d\n", aw1->type);
2006                 return (1);
2007         }
2008 }
2009
2010 /**
2011  * Checksum updates are a little complicated because the checksum in the TCP/UDP
2012  * header isn't always a full checksum. In some cases (i.e. output) it's a
2013  * pseudo-header checksum, which is a partial checksum over src/dst IP
2014  * addresses, protocol number and length.
2015  *
2016  * That means we have the following cases:
2017  *  * Input or forwarding: we don't have TSO, the checksum fields are full
2018  *      checksums, we need to update the checksum whenever we change anything.
2019  *  * Output (i.e. the checksum is a pseudo-header checksum):
2020  *      x The field being updated is src/dst address or affects the length of
2021  *      the packet. We need to update the pseudo-header checksum (note that this
2022  *      checksum is not ones' complement).
2023  *      x Some other field is being modified (e.g. src/dst port numbers): We
2024  *      don't have to update anything.
2025  **/
2026 u_int16_t
2027 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
2028 {
2029         u_int32_t       l;
2030
2031         if (udp && !cksum)
2032                 return (0x0000);
2033         l = cksum + old - new;
2034         l = (l >> 16) + (l & 65535);
2035         l = l & 65535;
2036         if (udp && !l)
2037                 return (0xFFFF);
2038         return (l);
2039 }
2040
2041 u_int16_t
2042 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old,
2043         u_int16_t new, u_int8_t udp)
2044 {
2045         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2046                 return (cksum);
2047
2048         return (pf_cksum_fixup(cksum, old, new, udp));
2049 }
2050
2051 void
2052 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic,
2053         u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u,
2054         sa_family_t af)
2055 {
2056         struct pf_addr  ao;
2057         u_int16_t       po = *p;
2058
2059         PF_ACPY(&ao, a, af);
2060         PF_ACPY(a, an, af);
2061
2062         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2063                 *pc = ~*pc;
2064
2065         *p = pn;
2066
2067         switch (af) {
2068 #ifdef INET
2069         case AF_INET:
2070                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2071                     ao.addr16[0], an->addr16[0], 0),
2072                     ao.addr16[1], an->addr16[1], 0);
2073                 *p = pn;
2074
2075                 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc,
2076                     ao.addr16[0], an->addr16[0], u),
2077                     ao.addr16[1], an->addr16[1], u);
2078
2079                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2080                 break;
2081 #endif /* INET */
2082 #ifdef INET6
2083         case AF_INET6:
2084                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2085                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2086                     pf_cksum_fixup(pf_cksum_fixup(*pc,
2087                     ao.addr16[0], an->addr16[0], u),
2088                     ao.addr16[1], an->addr16[1], u),
2089                     ao.addr16[2], an->addr16[2], u),
2090                     ao.addr16[3], an->addr16[3], u),
2091                     ao.addr16[4], an->addr16[4], u),
2092                     ao.addr16[5], an->addr16[5], u),
2093                     ao.addr16[6], an->addr16[6], u),
2094                     ao.addr16[7], an->addr16[7], u);
2095
2096                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2097                 break;
2098 #endif /* INET6 */
2099         }
2100
2101         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA |
2102             CSUM_DELAY_DATA_IPV6)) {
2103                 *pc = ~*pc;
2104                 if (! *pc)
2105                         *pc = 0xffff;
2106         }
2107 }
2108
2109 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
2110 void
2111 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
2112 {
2113         u_int32_t       ao;
2114
2115         memcpy(&ao, a, sizeof(ao));
2116         memcpy(a, &an, sizeof(u_int32_t));
2117         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
2118             ao % 65536, an % 65536, u);
2119 }
2120
2121 void
2122 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp)
2123 {
2124         u_int32_t       ao;
2125
2126         memcpy(&ao, a, sizeof(ao));
2127         memcpy(a, &an, sizeof(u_int32_t));
2128
2129         *c = pf_proto_cksum_fixup(m,
2130             pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp),
2131             ao % 65536, an % 65536, udp);
2132 }
2133
2134 #ifdef INET6
2135 void
2136 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
2137 {
2138         struct pf_addr  ao;
2139
2140         PF_ACPY(&ao, a, AF_INET6);
2141         PF_ACPY(a, an, AF_INET6);
2142
2143         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2144             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2145             pf_cksum_fixup(pf_cksum_fixup(*c,
2146             ao.addr16[0], an->addr16[0], u),
2147             ao.addr16[1], an->addr16[1], u),
2148             ao.addr16[2], an->addr16[2], u),
2149             ao.addr16[3], an->addr16[3], u),
2150             ao.addr16[4], an->addr16[4], u),
2151             ao.addr16[5], an->addr16[5], u),
2152             ao.addr16[6], an->addr16[6], u),
2153             ao.addr16[7], an->addr16[7], u);
2154 }
2155 #endif /* INET6 */
2156
2157 void
2158 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
2159     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
2160     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
2161 {
2162         struct pf_addr  oia, ooa;
2163
2164         PF_ACPY(&oia, ia, af);
2165         if (oa)
2166                 PF_ACPY(&ooa, oa, af);
2167
2168         /* Change inner protocol port, fix inner protocol checksum. */
2169         if (ip != NULL) {
2170                 u_int16_t       oip = *ip;
2171                 u_int32_t       opc;
2172
2173                 if (pc != NULL)
2174                         opc = *pc;
2175                 *ip = np;
2176                 if (pc != NULL)
2177                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
2178                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
2179                 if (pc != NULL)
2180                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
2181         }
2182         /* Change inner ip address, fix inner ip and icmp checksums. */
2183         PF_ACPY(ia, na, af);
2184         switch (af) {
2185 #ifdef INET
2186         case AF_INET: {
2187                 u_int32_t        oh2c = *h2c;
2188
2189                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
2190                     oia.addr16[0], ia->addr16[0], 0),
2191                     oia.addr16[1], ia->addr16[1], 0);
2192                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2193                     oia.addr16[0], ia->addr16[0], 0),
2194                     oia.addr16[1], ia->addr16[1], 0);
2195                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
2196                 break;
2197         }
2198 #endif /* INET */
2199 #ifdef INET6
2200         case AF_INET6:
2201                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2202                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2203                     pf_cksum_fixup(pf_cksum_fixup(*ic,
2204                     oia.addr16[0], ia->addr16[0], u),
2205                     oia.addr16[1], ia->addr16[1], u),
2206                     oia.addr16[2], ia->addr16[2], u),
2207                     oia.addr16[3], ia->addr16[3], u),
2208                     oia.addr16[4], ia->addr16[4], u),
2209                     oia.addr16[5], ia->addr16[5], u),
2210                     oia.addr16[6], ia->addr16[6], u),
2211                     oia.addr16[7], ia->addr16[7], u);
2212                 break;
2213 #endif /* INET6 */
2214         }
2215         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
2216         if (oa) {
2217                 PF_ACPY(oa, na, af);
2218                 switch (af) {
2219 #ifdef INET
2220                 case AF_INET:
2221                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
2222                             ooa.addr16[0], oa->addr16[0], 0),
2223                             ooa.addr16[1], oa->addr16[1], 0);
2224                         break;
2225 #endif /* INET */
2226 #ifdef INET6
2227                 case AF_INET6:
2228                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2229                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2230                             pf_cksum_fixup(pf_cksum_fixup(*ic,
2231                             ooa.addr16[0], oa->addr16[0], u),
2232                             ooa.addr16[1], oa->addr16[1], u),
2233                             ooa.addr16[2], oa->addr16[2], u),
2234                             ooa.addr16[3], oa->addr16[3], u),
2235                             ooa.addr16[4], oa->addr16[4], u),
2236                             ooa.addr16[5], oa->addr16[5], u),
2237                             ooa.addr16[6], oa->addr16[6], u),
2238                             ooa.addr16[7], oa->addr16[7], u);
2239                         break;
2240 #endif /* INET6 */
2241                 }
2242         }
2243 }
2244
2245
2246 /*
2247  * Need to modulate the sequence numbers in the TCP SACK option
2248  * (credits to Krzysztof Pfaff for report and patch)
2249  */
2250 int
2251 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
2252     struct tcphdr *th, struct pf_state_peer *dst)
2253 {
2254         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
2255 #ifdef __FreeBSD__
2256         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
2257 #else
2258         u_int8_t opts[MAX_TCPOPTLEN], *opt = opts;
2259 #endif
2260         int copyback = 0, i, olen;
2261         struct sackblk sack;
2262
2263 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
2264         if (hlen < TCPOLEN_SACKLEN ||
2265             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
2266                 return 0;
2267
2268         while (hlen >= TCPOLEN_SACKLEN) {
2269                 olen = opt[1];
2270                 switch (*opt) {
2271                 case TCPOPT_EOL:        /* FALLTHROUGH */
2272                 case TCPOPT_NOP:
2273                         opt++;
2274                         hlen--;
2275                         break;
2276                 case TCPOPT_SACK:
2277                         if (olen > hlen)
2278                                 olen = hlen;
2279                         if (olen >= TCPOLEN_SACKLEN) {
2280                                 for (i = 2; i + TCPOLEN_SACK <= olen;
2281                                     i += TCPOLEN_SACK) {
2282                                         memcpy(&sack, &opt[i], sizeof(sack));
2283                                         pf_change_proto_a(m, &sack.start, &th->th_sum,
2284                                             htonl(ntohl(sack.start) - dst->seqdiff), 0);
2285                                         pf_change_proto_a(m, &sack.end, &th->th_sum,
2286                                             htonl(ntohl(sack.end) - dst->seqdiff), 0);
2287                                         memcpy(&opt[i], &sack, sizeof(sack));
2288                                 }
2289                                 copyback = 1;
2290                         }
2291                         /* FALLTHROUGH */
2292                 default:
2293                         if (olen < 2)
2294                                 olen = 2;
2295                         hlen -= olen;
2296                         opt += olen;
2297                 }
2298         }
2299
2300         if (copyback)
2301 #ifdef __FreeBSD__
2302                 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts);
2303 #else
2304                 m_copyback(m, off + sizeof(*th), thoptlen, opts);
2305 #endif
2306         return (copyback);
2307 }
2308
2309 void
2310 #ifdef __FreeBSD__
2311 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af,
2312 #else
2313 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
2314 #endif
2315     const struct pf_addr *saddr, const struct pf_addr *daddr,
2316     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
2317     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
2318     u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
2319 {
2320         struct mbuf     *m;
2321         int              len, tlen;
2322 #ifdef INET
2323         struct ip       *h;
2324 #endif /* INET */
2325 #ifdef INET6
2326         struct ip6_hdr  *h6;
2327 #endif /* INET6 */
2328         struct tcphdr   *th;
2329         char            *opt;
2330 #ifdef __FreeBSD__
2331         struct pf_mtag  *pf_mtag;
2332
2333         KASSERT(
2334 #ifdef INET
2335             af == AF_INET
2336 #else
2337             0
2338 #endif
2339             ||
2340 #ifdef INET6
2341             af == AF_INET6
2342 #else
2343             0
2344 #endif
2345             , ("Unsupported AF %d", af));
2346         len = 0;
2347         th = NULL;
2348 #ifdef INET
2349         h = NULL;
2350 #endif
2351 #ifdef INET6
2352         h6 = NULL;
2353 #endif
2354 #endif /* __FreeBSD__ */
2355
2356         /* maximum segment size tcp option */
2357         tlen = sizeof(struct tcphdr);
2358         if (mss)
2359                 tlen += 4;
2360
2361         switch (af) {
2362 #ifdef INET
2363         case AF_INET:
2364                 len = sizeof(struct ip) + tlen;
2365                 break;
2366 #endif /* INET */
2367 #ifdef INET6
2368         case AF_INET6:
2369                 len = sizeof(struct ip6_hdr) + tlen;
2370                 break;
2371 #endif /* INET6 */
2372         }
2373
2374         /* create outgoing mbuf */
2375         m = m_gethdr(M_DONTWAIT, MT_HEADER);
2376         if (m == NULL)
2377                 return;
2378 #ifdef __FreeBSD__
2379 #ifdef MAC
2380         mac_netinet_firewall_send(m);
2381 #endif
2382         if ((pf_mtag = pf_get_mtag(m)) == NULL) {
2383                 m_freem(m);
2384                 return;
2385         }
2386 #endif
2387         if (tag)
2388 #ifdef __FreeBSD__
2389                 m->m_flags |= M_SKIP_FIREWALL;
2390         pf_mtag->tag = rtag;
2391 #else
2392                 m->m_pkthdr.pf.flags |= PF_TAG_GENERATED;
2393         m->m_pkthdr.pf.tag = rtag;
2394 #endif
2395
2396         if (r != NULL && r->rtableid >= 0)
2397 #ifdef __FreeBSD__
2398         {
2399                 M_SETFIB(m, r->rtableid);
2400                 pf_mtag->rtableid = r->rtableid;
2401 #else
2402                 m->m_pkthdr.pf.rtableid = r->rtableid;
2403 #endif
2404 #ifdef __FreeBSD__
2405         }
2406 #endif
2407
2408 #ifdef ALTQ
2409         if (r != NULL && r->qid) {
2410 #ifdef __FreeBSD__
2411                 pf_mtag->qid = r->qid;
2412
2413                 /* add hints for ecn */
2414                 pf_mtag->hdr = mtod(m, struct ip *);
2415 #else
2416                 m->m_pkthdr.pf.qid = r->qid;
2417                 /* add hints for ecn */
2418                 m->m_pkthdr.pf.hdr = mtod(m, struct ip *);
2419 #endif
2420         }
2421 #endif /* ALTQ */
2422         m->m_data += max_linkhdr;
2423         m->m_pkthdr.len = m->m_len = len;
2424         m->m_pkthdr.rcvif = NULL;
2425         bzero(m->m_data, len);
2426         switch (af) {
2427 #ifdef INET
2428         case AF_INET:
2429                 h = mtod(m, struct ip *);
2430
2431                 /* IP header fields included in the TCP checksum */
2432                 h->ip_p = IPPROTO_TCP;
2433                 h->ip_len = htons(tlen);
2434                 h->ip_src.s_addr = saddr->v4.s_addr;
2435                 h->ip_dst.s_addr = daddr->v4.s_addr;
2436
2437                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
2438                 break;
2439 #endif /* INET */
2440 #ifdef INET6
2441         case AF_INET6:
2442                 h6 = mtod(m, struct ip6_hdr *);
2443
2444                 /* IP header fields included in the TCP checksum */
2445                 h6->ip6_nxt = IPPROTO_TCP;
2446                 h6->ip6_plen = htons(tlen);
2447                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
2448                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
2449
2450                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
2451                 break;
2452 #endif /* INET6 */
2453         }
2454
2455         /* TCP header */
2456         th->th_sport = sport;
2457         th->th_dport = dport;
2458         th->th_seq = htonl(seq);
2459         th->th_ack = htonl(ack);
2460         th->th_off = tlen >> 2;
2461         th->th_flags = flags;
2462         th->th_win = htons(win);
2463
2464         if (mss) {
2465                 opt = (char *)(th + 1);
2466                 opt[0] = TCPOPT_MAXSEG;
2467                 opt[1] = 4;
2468                 HTONS(mss);
2469                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
2470         }
2471
2472         switch (af) {
2473 #ifdef INET
2474         case AF_INET:
2475                 /* TCP checksum */
2476                 th->th_sum = in_cksum(m, len);
2477
2478                 /* Finish the IP header */
2479                 h->ip_v = 4;
2480                 h->ip_hl = sizeof(*h) >> 2;
2481                 h->ip_tos = IPTOS_LOWDELAY;
2482 #ifdef __FreeBSD__
2483                 h->ip_off = V_path_mtu_discovery ? IP_DF : 0;
2484                 h->ip_len = len;
2485                 h->ip_ttl = ttl ? ttl : V_ip_defttl;
2486 #else
2487                 h->ip_len = htons(len);
2488                 h->ip_off = htons(ip_mtudisc ? IP_DF : 0);
2489                 h->ip_ttl = ttl ? ttl : ip_defttl;
2490 #endif
2491                 h->ip_sum = 0;
2492                 if (eh == NULL) {
2493 #ifdef __FreeBSD__
2494                 PF_UNLOCK();
2495                 ip_output(m, (void *)NULL, (void *)NULL, 0,
2496                     (void *)NULL, (void *)NULL);
2497                 PF_LOCK();
2498 #else /* ! __FreeBSD__ */
2499                         ip_output(m, (void *)NULL, (void *)NULL, 0,
2500                             (void *)NULL, (void *)NULL);
2501 #endif
2502                 } else {
2503                         struct route             ro;
2504                         struct rtentry           rt;
2505                         struct ether_header     *e = (void *)ro.ro_dst.sa_data;
2506
2507                         if (ifp == NULL) {
2508                                 m_freem(m);
2509                                 return;
2510                         }
2511                         rt.rt_ifp = ifp;
2512                         ro.ro_rt = &rt;
2513                         ro.ro_dst.sa_len = sizeof(ro.ro_dst);
2514                         ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
2515                         bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
2516                         bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
2517                         e->ether_type = eh->ether_type;
2518 #ifdef __FreeBSD__
2519                         PF_UNLOCK();
2520                         /* XXX_IMPORT: later */
2521                         ip_output(m, (void *)NULL, &ro, 0,
2522                             (void *)NULL, (void *)NULL);
2523                         PF_LOCK();
2524 #else /* ! __FreeBSD__ */
2525                         ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER,
2526                             (void *)NULL, (void *)NULL);
2527 #endif
2528                 }
2529                 break;
2530 #endif /* INET */
2531 #ifdef INET6
2532         case AF_INET6:
2533                 /* TCP checksum */
2534                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
2535                     sizeof(struct ip6_hdr), tlen);
2536
2537                 h6->ip6_vfc |= IPV6_VERSION;
2538                 h6->ip6_hlim = IPV6_DEFHLIM;
2539
2540 #ifdef __FreeBSD__
2541                 PF_UNLOCK();
2542                 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
2543                 PF_LOCK();
2544 #else
2545                 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
2546 #endif
2547                 break;
2548 #endif /* INET6 */
2549         }
2550 }
2551
2552 static void
2553 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
2554     struct pf_rule *r)
2555 {
2556         struct mbuf     *m0;
2557 #ifdef __FreeBSD__
2558 #ifdef INET
2559         struct ip *ip;
2560 #endif
2561         struct pf_mtag *pf_mtag;
2562 #endif
2563
2564 #ifdef __FreeBSD__
2565         m0 = m_copypacket(m, M_DONTWAIT);
2566         if (m0 == NULL)
2567                 return;
2568 #else
2569         if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL)
2570                 return;
2571 #endif
2572
2573 #ifdef __FreeBSD__
2574         if ((pf_mtag = pf_get_mtag(m0)) == NULL)
2575                 return;
2576         /* XXX: revisit */
2577         m0->m_flags |= M_SKIP_FIREWALL;
2578 #else
2579         m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED;
2580 #endif
2581
2582         if (r->rtableid >= 0)
2583 #ifdef __FreeBSD__
2584         {
2585                 M_SETFIB(m0, r->rtableid);
2586                 pf_mtag->rtableid = r->rtableid;
2587 #else
2588                 m0->m_pkthdr.pf.rtableid = r->rtableid;
2589 #endif
2590 #ifdef __FreeBSD__
2591         }
2592 #endif
2593
2594 #ifdef ALTQ
2595         if (r->qid) {
2596 #ifdef __FreeBSD__
2597                 pf_mtag->qid = r->qid;
2598                 /* add hints for ecn */
2599                 pf_mtag->hdr = mtod(m0, struct ip *);
2600 #else
2601                 m0->m_pkthdr.pf.qid = r->qid;
2602                 /* add hints for ecn */
2603                 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *);
2604 #endif
2605         }
2606 #endif /* ALTQ */
2607
2608         switch (af) {
2609 #ifdef INET
2610         case AF_INET:
2611 #ifdef __FreeBSD__
2612                 /* icmp_error() expects host byte ordering */
2613                 ip = mtod(m0, struct ip *);
2614                 NTOHS(ip->ip_len);
2615                 NTOHS(ip->ip_off);
2616                 PF_UNLOCK();
2617                 icmp_error(m0, type, code, 0, 0);
2618                 PF_LOCK();
2619 #else
2620                 icmp_error(m0, type, code, 0, 0);
2621 #endif
2622                 break;
2623 #endif /* INET */
2624 #ifdef INET6
2625         case AF_INET6:
2626 #ifdef __FreeBSD__
2627                 PF_UNLOCK();
2628 #endif
2629                 icmp6_error(m0, type, code, 0);
2630 #ifdef __FreeBSD__
2631                 PF_LOCK();
2632 #endif
2633                 break;
2634 #endif /* INET6 */
2635         }
2636 }
2637
2638 /*
2639  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
2640  * If n is 0, they match if they are equal. If n is != 0, they match if they
2641  * are different.
2642  */
2643 int
2644 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
2645     struct pf_addr *b, sa_family_t af)
2646 {
2647         int     match = 0;
2648
2649         switch (af) {
2650 #ifdef INET
2651         case AF_INET:
2652                 if ((a->addr32[0] & m->addr32[0]) ==
2653                     (b->addr32[0] & m->addr32[0]))
2654                         match++;
2655                 break;
2656 #endif /* INET */
2657 #ifdef INET6
2658         case AF_INET6:
2659                 if (((a->addr32[0] & m->addr32[0]) ==
2660                      (b->addr32[0] & m->addr32[0])) &&
2661                     ((a->addr32[1] & m->addr32[1]) ==
2662                      (b->addr32[1] & m->addr32[1])) &&
2663                     ((a->addr32[2] & m->addr32[2]) ==
2664                      (b->addr32[2] & m->addr32[2])) &&
2665                     ((a->addr32[3] & m->addr32[3]) ==
2666                      (b->addr32[3] & m->addr32[3])))
2667                         match++;
2668                 break;
2669 #endif /* INET6 */
2670         }
2671         if (match) {
2672                 if (n)
2673                         return (0);
2674                 else
2675                         return (1);
2676         } else {
2677                 if (n)
2678                         return (1);
2679                 else
2680                         return (0);
2681         }
2682 }
2683
2684 /*
2685  * Return 1 if b <= a <= e, otherwise return 0.
2686  */
2687 int
2688 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
2689     struct pf_addr *a, sa_family_t af)
2690 {
2691         switch (af) {
2692 #ifdef INET
2693         case AF_INET:
2694                 if ((a->addr32[0] < b->addr32[0]) ||
2695                     (a->addr32[0] > e->addr32[0]))
2696                         return (0);
2697                 break;
2698 #endif /* INET */
2699 #ifdef INET6
2700         case AF_INET6: {
2701                 int     i;
2702
2703                 /* check a >= b */
2704                 for (i = 0; i < 4; ++i)
2705                         if (a->addr32[i] > b->addr32[i])
2706                                 break;
2707                         else if (a->addr32[i] < b->addr32[i])
2708                                 return (0);
2709                 /* check a <= e */
2710                 for (i = 0; i < 4; ++i)
2711                         if (a->addr32[i] < e->addr32[i])
2712                                 break;
2713                         else if (a->addr32[i] > e->addr32[i])
2714                                 return (0);
2715                 break;
2716         }
2717 #endif /* INET6 */
2718         }
2719         return (1);
2720 }
2721
2722 int
2723 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2724 {
2725         switch (op) {
2726         case PF_OP_IRG:
2727                 return ((p > a1) && (p < a2));
2728         case PF_OP_XRG:
2729                 return ((p < a1) || (p > a2));
2730         case PF_OP_RRG:
2731                 return ((p >= a1) && (p <= a2));
2732         case PF_OP_EQ:
2733                 return (p == a1);
2734         case PF_OP_NE:
2735                 return (p != a1);
2736         case PF_OP_LT:
2737                 return (p < a1);
2738         case PF_OP_LE:
2739                 return (p <= a1);
2740         case PF_OP_GT:
2741                 return (p > a1);
2742         case PF_OP_GE:
2743                 return (p >= a1);
2744         }
2745         return (0); /* never reached */
2746 }
2747
2748 int
2749 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2750 {
2751         NTOHS(a1);
2752         NTOHS(a2);
2753         NTOHS(p);
2754         return (pf_match(op, a1, a2, p));
2755 }
2756
2757 int
2758 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2759 {
2760         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2761                 return (0);
2762         return (pf_match(op, a1, a2, u));
2763 }
2764
2765 int
2766 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2767 {
2768         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2769                 return (0);
2770         return (pf_match(op, a1, a2, g));
2771 }
2772
2773 int
2774 #ifdef __FreeBSD__
2775 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag,
2776     struct pf_mtag *pf_mtag)
2777 #else
2778 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag)
2779 #endif
2780 {
2781         if (*tag == -1)
2782 #ifdef __FreeBSD__
2783                 *tag = pf_mtag->tag;
2784 #else
2785                 *tag = m->m_pkthdr.pf.tag;
2786 #endif
2787
2788         return ((!r->match_tag_not && r->match_tag == *tag) ||
2789             (r->match_tag_not && r->match_tag != *tag));
2790 }
2791
2792 int
2793 #ifdef __FreeBSD__
2794 pf_tag_packet(struct mbuf *m, int tag, int rtableid,
2795     struct pf_mtag *pf_mtag)
2796 #else
2797 pf_tag_packet(struct mbuf *m, int tag, int rtableid)
2798 #endif
2799 {
2800         if (tag <= 0 && rtableid < 0)
2801                 return (0);
2802
2803         if (tag > 0)
2804 #ifdef __FreeBSD__
2805                 pf_mtag->tag = tag;
2806 #else
2807                 m->m_pkthdr.pf.tag = tag;
2808 #endif
2809         if (rtableid >= 0)
2810 #ifdef __FreeBSD__
2811         {
2812                 M_SETFIB(m, rtableid);
2813         }
2814 #else
2815                 m->m_pkthdr.pf.rtableid = rtableid;
2816 #endif
2817
2818         return (0);
2819 }
2820
2821 void
2822 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
2823     struct pf_rule **r, struct pf_rule **a, int *match)
2824 {
2825         struct pf_anchor_stackframe     *f;
2826
2827         (*r)->anchor->match = 0;
2828         if (match)
2829                 *match = 0;
2830 #ifdef __FreeBSD__
2831         if (*depth >= sizeof(V_pf_anchor_stack) /
2832             sizeof(V_pf_anchor_stack[0])) {
2833 #else
2834         if (*depth >= sizeof(pf_anchor_stack) /
2835             sizeof(pf_anchor_stack[0])) {
2836 #endif
2837                 printf("pf_step_into_anchor: stack overflow\n");
2838                 *r = TAILQ_NEXT(*r, entries);
2839                 return;
2840         } else if (*depth == 0 && a != NULL)
2841                 *a = *r;
2842 #ifdef __FreeBSD__
2843         f = V_pf_anchor_stack + (*depth)++;
2844 #else
2845         f = pf_anchor_stack + (*depth)++;
2846 #endif
2847         f->rs = *rs;
2848         f->r = *r;
2849         if ((*r)->anchor_wildcard) {
2850                 f->parent = &(*r)->anchor->children;
2851                 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
2852                     NULL) {
2853                         *r = NULL;
2854                         return;
2855                 }
2856                 *rs = &f->child->ruleset;
2857         } else {
2858                 f->parent = NULL;
2859                 f->child = NULL;
2860                 *rs = &(*r)->anchor->ruleset;
2861         }
2862         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2863 }
2864
2865 int
2866 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
2867     struct pf_rule **r, struct pf_rule **a, int *match)
2868 {
2869         struct pf_anchor_stackframe     *f;
2870         int quick = 0;
2871
2872         do {
2873                 if (*depth <= 0)
2874                         break;
2875 #ifdef __FreeBSD__
2876                 f = V_pf_anchor_stack + *depth - 1;
2877 #else
2878                 f = pf_anchor_stack + *depth - 1;
2879 #endif
2880                 if (f->parent != NULL && f->child != NULL) {
2881                         if (f->child->match ||
2882                             (match != NULL && *match)) {
2883                                 f->r->anchor->match = 1;
2884                                 *match = 0;
2885                         }
2886                         f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
2887                         if (f->child != NULL) {
2888                                 *rs = &f->child->ruleset;
2889                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2890                                 if (*r == NULL)
2891                                         continue;
2892                                 else
2893                                         break;
2894                         }
2895                 }
2896                 (*depth)--;
2897                 if (*depth == 0 && a != NULL)
2898                         *a = NULL;
2899                 *rs = f->rs;
2900                 if (f->r->anchor->match || (match != NULL && *match))
2901                         quick = f->r->quick;
2902                 *r = TAILQ_NEXT(f->r, entries);
2903         } while (*r == NULL);
2904
2905         return (quick);
2906 }
2907
2908 #ifdef INET6
2909 void
2910 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2911     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2912 {
2913         switch (af) {
2914 #ifdef INET
2915         case AF_INET:
2916                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2917                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2918                 break;
2919 #endif /* INET */
2920         case AF_INET6:
2921                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2922                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2923                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2924                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2925                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2926                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2927                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2928                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2929                 break;
2930         }
2931 }
2932
2933 void
2934 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2935 {
2936         switch (af) {
2937 #ifdef INET
2938         case AF_INET:
2939                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2940                 break;
2941 #endif /* INET */
2942         case AF_INET6:
2943                 if (addr->addr32[3] == 0xffffffff) {
2944                         addr->addr32[3] = 0;
2945                         if (addr->addr32[2] == 0xffffffff) {
2946                                 addr->addr32[2] = 0;
2947                                 if (addr->addr32[1] == 0xffffffff) {
2948                                         addr->addr32[1] = 0;
2949                                         addr->addr32[0] =
2950                                             htonl(ntohl(addr->addr32[0]) + 1);
2951                                 } else
2952                                         addr->addr32[1] =
2953                                             htonl(ntohl(addr->addr32[1]) + 1);
2954                         } else
2955                                 addr->addr32[2] =
2956                                     htonl(ntohl(addr->addr32[2]) + 1);
2957                 } else
2958                         addr->addr32[3] =
2959                             htonl(ntohl(addr->addr32[3]) + 1);
2960                 break;
2961         }
2962 }
2963 #endif /* INET6 */
2964
2965 int
2966 #ifdef __FreeBSD__
2967 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct inpcb *inp_arg)
2968 #else
2969 pf_socket_lookup(int direction, struct pf_pdesc *pd)
2970 #endif
2971 {
2972         struct pf_addr          *saddr, *daddr;
2973         u_int16_t                sport, dport;
2974 #ifdef __FreeBSD__
2975         struct inpcbinfo        *pi;
2976 #else
2977         struct inpcbtable       *tb;
2978 #endif
2979         struct inpcb            *inp;
2980
2981         if (pd == NULL)
2982                 return (-1);
2983         pd->lookup.uid = UID_MAX;
2984         pd->lookup.gid = GID_MAX;
2985         pd->lookup.pid = NO_PID;
2986
2987 #ifdef __FreeBSD__
2988         if (inp_arg != NULL) {
2989                 INP_LOCK_ASSERT(inp_arg);
2990                 pd->lookup.uid = inp_arg->inp_cred->cr_uid;
2991                 pd->lookup.gid = inp_arg->inp_cred->cr_groups[0];
2992                 return (1);
2993         }
2994 #endif
2995
2996         switch (pd->proto) {
2997         case IPPROTO_TCP:
2998                 if (pd->hdr.tcp == NULL)
2999                         return (-1);
3000                 sport = pd->hdr.tcp->th_sport;
3001                 dport = pd->hdr.tcp->th_dport;
3002 #ifdef __FreeBSD__
3003                 pi = &V_tcbinfo;
3004 #else
3005                 tb = &tcbtable;
3006 #endif
3007                 break;
3008         case IPPROTO_UDP:
3009                 if (pd->hdr.udp == NULL)
3010                         return (-1);
3011                 sport = pd->hdr.udp->uh_sport;
3012                 dport = pd->hdr.udp->uh_dport;
3013 #ifdef __FreeBSD__
3014                 pi = &V_udbinfo;
3015 #else
3016                 tb = &udbtable;
3017 #endif
3018                 break;
3019         default:
3020                 return (-1);
3021         }
3022         if (direction == PF_IN) {
3023                 saddr = pd->src;
3024                 daddr = pd->dst;
3025         } else {
3026                 u_int16_t       p;
3027
3028                 p = sport;
3029                 sport = dport;
3030                 dport = p;
3031                 saddr = pd->dst;
3032                 daddr = pd->src;
3033         }
3034         switch (pd->af) {
3035 #ifdef INET
3036         case AF_INET:
3037 #ifdef __FreeBSD__
3038                 /*
3039                  * XXXRW: would be nice if we had an mbuf here so that we
3040                  * could use in_pcblookup_mbuf().
3041                  */
3042                 inp = in_pcblookup(pi, saddr->v4, sport, daddr->v4,
3043                         dport, INPLOOKUP_RLOCKPCB, NULL);
3044                 if (inp == NULL) {
3045                         inp = in_pcblookup(pi, saddr->v4, sport,
3046                            daddr->v4, dport, INPLOOKUP_WILDCARD |
3047                            INPLOOKUP_RLOCKPCB, NULL);
3048                         if (inp == NULL)
3049                                 return (-1);
3050                 }
3051 #else
3052                 inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport);
3053                 if (inp == NULL) {
3054                         inp = in_pcblookup_listen(tb, daddr->v4, dport, 0,
3055                             NULL);
3056                         if (inp == NULL)
3057                                 return (-1);
3058                 }
3059 #endif
3060                 break;
3061 #endif /* INET */
3062 #ifdef INET6
3063         case AF_INET6:
3064 #ifdef __FreeBSD__
3065                 /*
3066                  * XXXRW: would be nice if we had an mbuf here so that we
3067                  * could use in6_pcblookup_mbuf().
3068                  */
3069                 inp = in6_pcblookup(pi, &saddr->v6, sport,
3070                         &daddr->v6, dport, INPLOOKUP_RLOCKPCB, NULL);
3071                 if (inp == NULL) {
3072                         inp = in6_pcblookup(pi, &saddr->v6, sport,
3073                             &daddr->v6, dport, INPLOOKUP_WILDCARD |
3074                             INPLOOKUP_RLOCKPCB, NULL);
3075                         if (inp == NULL)
3076                                 return (-1);
3077                 }
3078 #else
3079                 inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6,
3080                     dport);
3081                 if (inp == NULL) {
3082                         inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0,
3083                             NULL);
3084                         if (inp == NULL)
3085                                 return (-1);
3086                 }
3087 #endif
3088                 break;
3089 #endif /* INET6 */
3090
3091         default:
3092                 return (-1);
3093         }
3094 #ifdef __FreeBSD__
3095         INP_RLOCK_ASSERT(inp);
3096         pd->lookup.uid = inp->inp_cred->cr_uid;
3097         pd->lookup.gid = inp->inp_cred->cr_groups[0];
3098         INP_RUNLOCK(inp);
3099 #else
3100         pd->lookup.uid = inp->inp_socket->so_euid;
3101         pd->lookup.gid = inp->inp_socket->so_egid;
3102         pd->lookup.pid = inp->inp_socket->so_cpid;
3103 #endif
3104         return (1);
3105 }
3106
3107 u_int8_t
3108 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3109 {
3110         int              hlen;
3111         u_int8_t         hdr[60];
3112         u_int8_t        *opt, optlen;
3113         u_int8_t         wscale = 0;
3114
3115         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
3116         if (hlen <= sizeof(struct tcphdr))
3117                 return (0);
3118         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3119                 return (0);
3120         opt = hdr + sizeof(struct tcphdr);
3121         hlen -= sizeof(struct tcphdr);
3122         while (hlen >= 3) {
3123                 switch (*opt) {
3124                 case TCPOPT_EOL:
3125                 case TCPOPT_NOP:
3126                         ++opt;
3127                         --hlen;
3128                         break;
3129                 case TCPOPT_WINDOW:
3130                         wscale = opt[2];
3131                         if (wscale > TCP_MAX_WINSHIFT)
3132                                 wscale = TCP_MAX_WINSHIFT;
3133                         wscale |= PF_WSCALE_FLAG;
3134                         /* FALLTHROUGH */
3135                 default:
3136                         optlen = opt[1];
3137                         if (optlen < 2)
3138                                 optlen = 2;
3139                         hlen -= optlen;
3140                         opt += optlen;
3141                         break;
3142                 }
3143         }
3144         return (wscale);
3145 }
3146
3147 u_int16_t
3148 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3149 {
3150         int              hlen;
3151         u_int8_t         hdr[60];
3152         u_int8_t        *opt, optlen;
3153 #ifdef __FreeBSD__
3154         u_int16_t        mss = V_tcp_mssdflt;
3155 #else
3156         u_int16_t        mss = tcp_mssdflt;
3157 #endif
3158
3159         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
3160         if (hlen <= sizeof(struct tcphdr))
3161                 return (0);
3162         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3163                 return (0);
3164         opt = hdr + sizeof(struct tcphdr);
3165         hlen -= sizeof(struct tcphdr);
3166         while (hlen >= TCPOLEN_MAXSEG) {
3167                 switch (*opt) {
3168                 case TCPOPT_EOL:
3169                 case TCPOPT_NOP:
3170                         ++opt;
3171                         --hlen;
3172                         break;
3173                 case TCPOPT_MAXSEG:
3174                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3175                         NTOHS(mss);
3176                         /* FALLTHROUGH */
3177                 default:
3178                         optlen = opt[1];
3179                         if (optlen < 2)
3180                                 optlen = 2;
3181                         hlen -= optlen;
3182                         opt += optlen;
3183                         break;
3184                 }
3185         }
3186         return (mss);
3187 }
3188
3189 u_int16_t
3190 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
3191 {
3192 #ifdef INET
3193         struct sockaddr_in      *dst;
3194         struct route             ro;
3195 #endif /* INET */
3196 #ifdef INET6
3197         struct sockaddr_in6     *dst6;
3198         struct route_in6         ro6;
3199 #endif /* INET6 */
3200         struct rtentry          *rt = NULL;
3201 #ifdef __FreeBSD__
3202         int                      hlen = 0;
3203         u_int16_t                mss = V_tcp_mssdflt;
3204 #else
3205         int                      hlen;
3206         u_int16_t                mss = tcp_mssdflt;
3207 #endif
3208
3209         switch (af) {
3210 #ifdef INET
3211         case AF_INET:
3212                 hlen = sizeof(struct ip);
3213                 bzero(&ro, sizeof(ro));
3214                 dst = (struct sockaddr_in *)&ro.ro_dst;
3215                 dst->sin_family = AF_INET;
3216                 dst->sin_len = sizeof(*dst);
3217                 dst->sin_addr = addr->v4;
3218 #ifdef __FreeBSD__
3219                 in_rtalloc_ign(&ro, 0, rtableid);
3220 #else /* ! __FreeBSD__ */
3221                 rtalloc_noclone(&ro, NO_CLONING);
3222 #endif
3223                 rt = ro.ro_rt;
3224                 break;
3225 #endif /* INET */
3226 #ifdef INET6
3227         case AF_INET6:
3228                 hlen = sizeof(struct ip6_hdr);
3229                 bzero(&ro6, sizeof(ro6));
3230                 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
3231                 dst6->sin6_family = AF_INET6;
3232                 dst6->sin6_len = sizeof(*dst6);
3233                 dst6->sin6_addr = addr->v6;
3234 #ifdef __FreeBSD__
3235                 in6_rtalloc_ign(&ro6, 0, rtableid);
3236 #else /* ! __FreeBSD__ */
3237                 rtalloc_noclone((struct route *)&ro6, NO_CLONING);
3238 #endif
3239                 rt = ro6.ro_rt;
3240                 break;
3241 #endif /* INET6 */
3242         }
3243
3244         if (rt && rt->rt_ifp) {
3245                 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
3246 #ifdef __FreeBSD__
3247                 mss = max(V_tcp_mssdflt, mss);
3248 #else
3249                 mss = max(tcp_mssdflt, mss);
3250 #endif
3251                 RTFREE(rt);
3252         }
3253         mss = min(mss, offer);
3254         mss = max(mss, 64);             /* sanity - at least max opt space */
3255         return (mss);
3256 }
3257
3258 void
3259 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
3260 {
3261         struct pf_rule *r = s->rule.ptr;
3262         struct pf_src_node *sn = NULL;
3263
3264         s->rt_kif = NULL;
3265         if (!r->rt || r->rt == PF_FASTROUTE)
3266                 return;
3267         switch (s->key[PF_SK_WIRE]->af) {
3268 #ifdef INET
3269         case AF_INET:
3270                 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, &sn);
3271                 s->rt_kif = r->rpool.cur->kif;
3272                 break;
3273 #endif /* INET */
3274 #ifdef INET6
3275         case AF_INET6:
3276                 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, &sn);
3277                 s->rt_kif = r->rpool.cur->kif;
3278                 break;
3279 #endif /* INET6 */
3280         }
3281 }
3282
3283 u_int32_t
3284 pf_tcp_iss(struct pf_pdesc *pd)
3285 {
3286         MD5_CTX ctx;
3287         u_int32_t digest[4];
3288
3289 #ifdef __FreeBSD__
3290         if (V_pf_tcp_secret_init == 0) {
3291                 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret));
3292                 MD5Init(&V_pf_tcp_secret_ctx);
3293                 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret,
3294                     sizeof(V_pf_tcp_secret));
3295                 V_pf_tcp_secret_init = 1;
3296         }
3297
3298         ctx = V_pf_tcp_secret_ctx;
3299 #else
3300         if (pf_tcp_secret_init == 0) {
3301                 arc4random_buf(pf_tcp_secret, sizeof(pf_tcp_secret));
3302                 MD5Init(&pf_tcp_secret_ctx);
3303                 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret,
3304                     sizeof(pf_tcp_secret));
3305                 pf_tcp_secret_init = 1;
3306         }
3307
3308         ctx = pf_tcp_secret_ctx;
3309 #endif
3310
3311         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3312         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3313         if (pd->af == AF_INET6) {
3314                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3315                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3316         } else {
3317                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3318                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3319         }
3320         MD5Final((u_char *)digest, &ctx);
3321 #ifdef __FreeBSD__
3322         V_pf_tcp_iss_off += 4096;
3323 #define ISN_RANDOM_INCREMENT (4096 - 1)
3324         return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) +
3325             V_pf_tcp_iss_off);
3326 #undef  ISN_RANDOM_INCREMENT
3327 #else
3328         pf_tcp_iss_off += 4096;
3329         return (digest[0] + tcp_iss + pf_tcp_iss_off);
3330 #endif
3331 }
3332
3333 int
3334 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3335     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3336     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
3337 #ifdef __FreeBSD__
3338     struct ifqueue *ifq, struct inpcb *inp)
3339 #else
3340     struct ifqueue *ifq)
3341 #endif
3342 {
3343         struct pf_rule          *nr = NULL;
3344         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3345         sa_family_t              af = pd->af;
3346         struct pf_rule          *r, *a = NULL;
3347         struct pf_ruleset       *ruleset = NULL;
3348         struct pf_src_node      *nsn = NULL;
3349         struct tcphdr           *th = pd->hdr.tcp;
3350         struct pf_state_key     *skw = NULL, *sks = NULL;
3351         struct pf_state_key     *sk = NULL, *nk = NULL;
3352         u_short                  reason;
3353         int                      rewrite = 0, hdrlen = 0;
3354         int                      tag = -1, rtableid = -1;
3355         int                      asd = 0;
3356         int                      match = 0;
3357         int                      state_icmp = 0;
3358 #ifdef __FreeBSD__
3359         u_int16_t                sport = 0, dport = 0;
3360         u_int16_t                bproto_sum = 0, bip_sum = 0;
3361 #else
3362         u_int16_t                sport, dport;
3363         u_int16_t                bproto_sum = 0, bip_sum;
3364 #endif
3365         u_int8_t                 icmptype = 0, icmpcode = 0;
3366
3367
3368         if (direction == PF_IN && pf_check_congestion(ifq)) {
3369                 REASON_SET(&reason, PFRES_CONGEST);
3370                 return (PF_DROP);
3371         }
3372
3373 #ifdef __FreeBSD__
3374         if (inp != NULL)
3375                 pd->lookup.done = pf_socket_lookup(direction, pd, inp);
3376         else if (V_debug_pfugidhack) {
3377                 PF_UNLOCK();
3378                 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n"));
3379                     pd->lookup.done = pf_socket_lookup(direction, pd, inp);
3380                 PF_LOCK();
3381         }
3382 #endif
3383
3384         switch (pd->proto) {
3385         case IPPROTO_TCP:
3386                 sport = th->th_sport;
3387                 dport = th->th_dport;
3388                 hdrlen = sizeof(*th);
3389                 break;
3390         case IPPROTO_UDP:
3391                 sport = pd->hdr.udp->uh_sport;
3392                 dport = pd->hdr.udp->uh_dport;
3393                 hdrlen = sizeof(*pd->hdr.udp);
3394                 break;
3395 #ifdef INET
3396         case IPPROTO_ICMP:
3397                 if (pd->af != AF_INET)
3398                         break;
3399                 sport = dport = pd->hdr.icmp->icmp_id;
3400                 hdrlen = sizeof(*pd->hdr.icmp);
3401                 icmptype = pd->hdr.icmp->icmp_type;
3402                 icmpcode = pd->hdr.icmp->icmp_code;
3403
3404                 if (icmptype == ICMP_UNREACH ||
3405                     icmptype == ICMP_SOURCEQUENCH ||
3406                     icmptype == ICMP_REDIRECT ||
3407                     icmptype == ICMP_TIMXCEED ||
3408                     icmptype == ICMP_PARAMPROB)
3409                         state_icmp++;
3410                 break;
3411 #endif /* INET */
3412 #ifdef INET6
3413         case IPPROTO_ICMPV6:
3414                 if (af != AF_INET6)
3415                         break;
3416                 sport = dport = pd->hdr.icmp6->icmp6_id;
3417                 hdrlen = sizeof(*pd->hdr.icmp6);
3418                 icmptype = pd->hdr.icmp6->icmp6_type;
3419                 icmpcode = pd->hdr.icmp6->icmp6_code;
3420
3421                 if (icmptype == ICMP6_DST_UNREACH ||
3422                     icmptype == ICMP6_PACKET_TOO_BIG ||
3423                     icmptype == ICMP6_TIME_EXCEEDED ||
3424                     icmptype == ICMP6_PARAM_PROB)
3425                         state_icmp++;
3426                 break;
3427 #endif /* INET6 */
3428         default:
3429                 sport = dport = hdrlen = 0;
3430                 break;
3431         }
3432
3433         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3434
3435         /* check packet for BINAT/NAT/RDR */
3436         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn,
3437             &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) {
3438                 if (nk == NULL || sk == NULL) {
3439                         REASON_SET(&reason, PFRES_MEMORY);
3440                         goto cleanup;
3441                 }
3442
3443                 if (pd->ip_sum)
3444                         bip_sum = *pd->ip_sum;
3445
3446                 switch (pd->proto) {
3447                 case IPPROTO_TCP:
3448                         bproto_sum = th->th_sum;
3449                         pd->proto_sum = &th->th_sum;
3450
3451                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3452                             nk->port[pd->sidx] != sport) {
3453                                 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum,
3454                                     &th->th_sum, &nk->addr[pd->sidx],
3455                                     nk->port[pd->sidx], 0, af);
3456                                 pd->sport = &th->th_sport;
3457                                 sport = th->th_sport;
3458                         }
3459
3460                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3461                             nk->port[pd->didx] != dport) {
3462                                 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum,
3463                                     &th->th_sum, &nk->addr[pd->didx],
3464                                     nk->port[pd->didx], 0, af);
3465                                 dport = th->th_dport;
3466                                 pd->dport = &th->th_dport;
3467                         }
3468                         rewrite++;
3469                         break;
3470                 case IPPROTO_UDP:
3471                         bproto_sum = pd->hdr.udp->uh_sum;
3472                         pd->proto_sum = &pd->hdr.udp->uh_sum;
3473
3474                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3475                             nk->port[pd->sidx] != sport) {
3476                                 pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport,
3477                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3478                                     &nk->addr[pd->sidx],
3479                                     nk->port[pd->sidx], 1, af);
3480                                 sport = pd->hdr.udp->uh_sport;
3481                                 pd->sport = &pd->hdr.udp->uh_sport;
3482                         }
3483
3484                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3485                             nk->port[pd->didx] != dport) {
3486                                 pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport,
3487                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3488                                     &nk->addr[pd->didx],
3489                                     nk->port[pd->didx], 1, af);
3490                                 dport = pd->hdr.udp->uh_dport;
3491                                 pd->dport = &pd->hdr.udp->uh_dport;
3492                         }
3493                         rewrite++;
3494                         break;
3495 #ifdef INET
3496                 case IPPROTO_ICMP:
3497                         nk->port[0] = nk->port[1];
3498                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3499                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3500                                     nk->addr[pd->sidx].v4.s_addr, 0);
3501
3502                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3503                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3504                                     nk->addr[pd->didx].v4.s_addr, 0);
3505
3506                         if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3507                                 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3508                                     pd->hdr.icmp->icmp_cksum, sport,
3509                                     nk->port[1], 0);
3510                                 pd->hdr.icmp->icmp_id = nk->port[1];
3511                                 pd->sport = &pd->hdr.icmp->icmp_id;
3512                         }
3513                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3514                         break;
3515 #endif /* INET */
3516 #ifdef INET6
3517                 case IPPROTO_ICMPV6:
3518                         nk->port[0] = nk->port[1];
3519                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3520                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3521                                     &nk->addr[pd->sidx], 0);
3522
3523                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3524                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3525                                     &nk->addr[pd->didx], 0);
3526                         rewrite++;
3527                         break;
3528 #endif /* INET */
3529                 default:
3530                         switch (af) {
3531 #ifdef INET
3532                         case AF_INET:
3533                                 if (PF_ANEQ(saddr,
3534                                     &nk->addr[pd->sidx], AF_INET))
3535                                         pf_change_a(&saddr->v4.s_addr,
3536                                             pd->ip_sum,
3537                                             nk->addr[pd->sidx].v4.s_addr, 0);
3538
3539                                 if (PF_ANEQ(daddr,
3540                                     &nk->addr[pd->didx], AF_INET))
3541                                         pf_change_a(&daddr->v4.s_addr,
3542                                             pd->ip_sum,
3543                                             nk->addr[pd->didx].v4.s_addr, 0);
3544                                 break;
3545 #endif /* INET */
3546 #ifdef INET6
3547                         case AF_INET6:
3548                                 if (PF_ANEQ(saddr,
3549                                     &nk->addr[pd->sidx], AF_INET6))
3550                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3551
3552                                 if (PF_ANEQ(daddr,
3553                                     &nk->addr[pd->didx], AF_INET6))
3554                                         PF_ACPY(saddr, &nk->addr[pd->didx], af);
3555                                 break;
3556 #endif /* INET */
3557                         }
3558                         break;
3559                 }
3560                 if (nr->natpass)
3561                         r = NULL;
3562                 pd->nat_rule = nr;
3563         }
3564
3565         while (r != NULL) {
3566                 r->evaluations++;
3567                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3568                         r = r->skip[PF_SKIP_IFP].ptr;
3569                 else if (r->direction && r->direction != direction)
3570                         r = r->skip[PF_SKIP_DIR].ptr;
3571                 else if (r->af && r->af != af)
3572                         r = r->skip[PF_SKIP_AF].ptr;
3573                 else if (r->proto && r->proto != pd->proto)
3574                         r = r->skip[PF_SKIP_PROTO].ptr;
3575                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3576                     r->src.neg, kif, M_GETFIB(m)))
3577                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3578                 /* tcp/udp only. port_op always 0 in other cases */
3579                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3580                     r->src.port[0], r->src.port[1], sport))
3581                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
3582                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3583                     r->dst.neg, NULL, M_GETFIB(m)))
3584                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3585                 /* tcp/udp only. port_op always 0 in other cases */
3586                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3587                     r->dst.port[0], r->dst.port[1], dport))
3588                         r = r->skip[PF_SKIP_DST_PORT].ptr;
3589                 /* icmp only. type always 0 in other cases */
3590                 else if (r->type && r->type != icmptype + 1)
3591                         r = TAILQ_NEXT(r, entries);
3592                 /* icmp only. type always 0 in other cases */
3593                 else if (r->code && r->code != icmpcode + 1)
3594                         r = TAILQ_NEXT(r, entries);
3595                 else if (r->tos && !(r->tos == pd->tos))
3596                         r = TAILQ_NEXT(r, entries);
3597                 else if (r->rule_flag & PFRULE_FRAGMENT)
3598                         r = TAILQ_NEXT(r, entries);
3599                 else if (pd->proto == IPPROTO_TCP &&
3600                     (r->flagset & th->th_flags) != r->flags)
3601                         r = TAILQ_NEXT(r, entries);
3602                 /* tcp/udp only. uid.op always 0 in other cases */
3603                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3604 #ifdef __FreeBSD__
3605                     pf_socket_lookup(direction, pd, inp), 1)) &&
3606 #else
3607                     pf_socket_lookup(direction, pd), 1)) &&
3608 #endif
3609                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3610                     pd->lookup.uid))
3611                         r = TAILQ_NEXT(r, entries);
3612                 /* tcp/udp only. gid.op always 0 in other cases */
3613                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3614 #ifdef __FreeBSD__
3615                     pf_socket_lookup(direction, pd, inp), 1)) &&
3616 #else
3617                     pf_socket_lookup(direction, pd), 1)) &&
3618 #endif
3619                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3620                     pd->lookup.gid))
3621                         r = TAILQ_NEXT(r, entries);
3622                 else if (r->prob &&
3623 #ifdef __FreeBSD__
3624                     r->prob <= arc4random())
3625 #else
3626                     r->prob <= arc4random_uniform(UINT_MAX - 1) + 1)
3627 #endif
3628                         r = TAILQ_NEXT(r, entries);
3629 #ifdef __FreeBSD__
3630                 else if (r->match_tag && !pf_match_tag(m, r, &tag, pd->pf_mtag))
3631 #else
3632                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3633 #endif
3634                         r = TAILQ_NEXT(r, entries);
3635                 else if (r->os_fingerprint != PF_OSFP_ANY &&
3636                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3637                     pf_osfp_fingerprint(pd, m, off, th),
3638                     r->os_fingerprint)))
3639                         r = TAILQ_NEXT(r, entries);
3640                 else {
3641                         if (r->tag)
3642                                 tag = r->tag;
3643                         if (r->rtableid >= 0)
3644                                 rtableid = r->rtableid;
3645                         if (r->anchor == NULL) {
3646                                 match = 1;
3647                                 *rm = r;
3648                                 *am = a;
3649                                 *rsm = ruleset;
3650                                 if ((*rm)->quick)
3651                                         break;
3652                                 r = TAILQ_NEXT(r, entries);
3653                         } else
3654                                 pf_step_into_anchor(&asd, &ruleset,
3655                                     PF_RULESET_FILTER, &r, &a, &match);
3656                 }
3657                 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3658                     PF_RULESET_FILTER, &r, &a, &match))
3659                         break;
3660         }
3661         r = *rm;
3662         a = *am;
3663         ruleset = *rsm;
3664
3665         REASON_SET(&reason, PFRES_MATCH);
3666
3667         if (r->log || (nr != NULL && nr->log)) {
3668                 if (rewrite)
3669                         m_copyback(m, off, hdrlen, pd->hdr.any);
3670                 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
3671                     a, ruleset, pd);
3672         }
3673
3674         if ((r->action == PF_DROP) &&
3675             ((r->rule_flag & PFRULE_RETURNRST) ||
3676             (r->rule_flag & PFRULE_RETURNICMP) ||
3677             (r->rule_flag & PFRULE_RETURN))) {
3678                 /* undo NAT changes, if they have taken place */
3679                 if (nr != NULL) {
3680                         PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3681                         PF_ACPY(daddr, &sk->addr[pd->didx], af);
3682                         if (pd->sport)
3683                                 *pd->sport = sk->port[pd->sidx];
3684                         if (pd->dport)
3685                                 *pd->dport = sk->port[pd->didx];
3686                         if (pd->proto_sum)
3687                                 *pd->proto_sum = bproto_sum;
3688                         if (pd->ip_sum)
3689                                 *pd->ip_sum = bip_sum;
3690                         m_copyback(m, off, hdrlen, pd->hdr.any);
3691                 }
3692                 if (pd->proto == IPPROTO_TCP &&
3693                     ((r->rule_flag & PFRULE_RETURNRST) ||
3694                     (r->rule_flag & PFRULE_RETURN)) &&
3695                     !(th->th_flags & TH_RST)) {
3696                         u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
3697                         int              len = 0;
3698 #ifdef INET
3699                         struct ip       *h4;
3700 #endif
3701 #ifdef INET6
3702                         struct ip6_hdr  *h6;
3703 #endif
3704
3705                         switch (af) {
3706 #ifdef INET
3707                         case AF_INET:
3708                                 h4 = mtod(m, struct ip *);
3709                                 len = ntohs(h4->ip_len) - off;
3710                                 break;
3711 #endif
3712 #ifdef INET6
3713                         case AF_INET6:
3714                                 h6 = mtod(m, struct ip6_hdr *);
3715                                 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6));
3716                                 break;
3717 #endif
3718                         }
3719
3720                         if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3721                                 REASON_SET(&reason, PFRES_PROTCKSUM);
3722                         else {
3723                                 if (th->th_flags & TH_SYN)
3724                                         ack++;
3725                                 if (th->th_flags & TH_FIN)
3726                                         ack++;
3727 #ifdef __FreeBSD__
3728                                 pf_send_tcp(m, r, af, pd->dst,
3729 #else
3730                                 pf_send_tcp(r, af, pd->dst,
3731 #endif
3732                                     pd->src, th->th_dport, th->th_sport,
3733                                     ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3734                                     r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
3735                         }
3736                 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3737                     r->return_icmp)
3738                         pf_send_icmp(m, r->return_icmp >> 8,
3739                             r->return_icmp & 255, af, r);
3740                 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3741                     r->return_icmp6)
3742                         pf_send_icmp(m, r->return_icmp6 >> 8,
3743                             r->return_icmp6 & 255, af, r);
3744         }
3745
3746         if (r->action == PF_DROP)
3747                 goto cleanup;
3748
3749 #ifdef __FreeBSD__
3750         if (pf_tag_packet(m, tag, rtableid, pd->pf_mtag)) {
3751 #else
3752         if (pf_tag_packet(m, tag, rtableid)) {
3753 #endif
3754                 REASON_SET(&reason, PFRES_MEMORY);
3755                 goto cleanup;
3756         }
3757
3758         if (!state_icmp && (r->keep_state || nr != NULL ||
3759             (pd->flags & PFDESC_TCP_NORM))) {
3760                 int action;
3761                 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m,
3762                     off, sport, dport, &rewrite, kif, sm, tag, bproto_sum,
3763                     bip_sum, hdrlen);
3764                 if (action != PF_PASS)
3765                         return (action);
3766         } else {
3767 #ifdef __FreeBSD__
3768                 if (sk != NULL)
3769                         pool_put(&V_pf_state_key_pl, sk);
3770                 if (nk != NULL)
3771                         pool_put(&V_pf_state_key_pl, nk);
3772 #else
3773                 if (sk != NULL)
3774                         pool_put(&pf_state_key_pl, sk);
3775                 if (nk != NULL)
3776                         pool_put(&pf_state_key_pl, nk);
3777 #endif
3778         }
3779
3780         /* copy back packet headers if we performed NAT operations */
3781         if (rewrite)
3782                 m_copyback(m, off, hdrlen, pd->hdr.any);
3783
3784 #if NPFSYNC > 0
3785         if (*sm != NULL && !ISSET((*sm)->state_flags, PFSTATE_NOSYNC) &&
3786 #ifdef __FreeBSD__
3787             direction == PF_OUT && pfsync_up_ptr != NULL && pfsync_up_ptr()) {
3788 #else
3789             direction == PF_OUT && pfsync_up()) {
3790 #endif
3791                 /*
3792                  * We want the state created, but we dont
3793                  * want to send this in case a partner
3794                  * firewall has to know about it to allow
3795                  * replies through it.
3796                  */
3797 #ifdef __FreeBSD__
3798                 if (pfsync_defer_ptr != NULL &&
3799                         pfsync_defer_ptr(*sm, m))
3800 #else
3801                 if (pfsync_defer(*sm, m))
3802 #endif
3803                         return (PF_DEFER);
3804         }
3805 #endif
3806
3807         return (PF_PASS);
3808
3809 cleanup:
3810 #ifdef __FreeBSD__
3811         if (sk != NULL)
3812                 pool_put(&V_pf_state_key_pl, sk);
3813         if (nk != NULL)
3814                 pool_put(&V_pf_state_key_pl, nk);
3815 #else
3816         if (sk != NULL)
3817                 pool_put(&pf_state_key_pl, sk);
3818         if (nk != NULL)
3819                 pool_put(&pf_state_key_pl, nk);
3820 #endif
3821         return (PF_DROP);
3822 }
3823
3824 static __inline int
3825 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3826     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw,
3827     struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk,
3828     struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite,
3829     struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum,
3830     u_int16_t bip_sum, int hdrlen)
3831 {
3832         struct pf_state         *s = NULL;
3833         struct pf_src_node      *sn = NULL;
3834         struct tcphdr           *th = pd->hdr.tcp;
3835 #ifdef __FreeBSD__
3836         u_int16_t                mss = V_tcp_mssdflt;
3837 #else
3838         u_int16_t                mss = tcp_mssdflt;
3839 #endif
3840         u_short                  reason;
3841
3842         /* check maximums */
3843         if (r->max_states && (r->states_cur >= r->max_states)) {
3844 #ifdef __FreeBSD__
3845                 V_pf_status.lcounters[LCNT_STATES]++;
3846 #else
3847                 pf_status.lcounters[LCNT_STATES]++;
3848 #endif
3849                 REASON_SET(&reason, PFRES_MAXSTATES);
3850                 return (PF_DROP);
3851         }
3852         /* src node for filter rule */
3853         if ((r->rule_flag & PFRULE_SRCTRACK ||
3854             r->rpool.opts & PF_POOL_STICKYADDR) &&
3855             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3856                 REASON_SET(&reason, PFRES_SRCLIMIT);
3857                 goto csfailed;
3858         }
3859         /* src node for translation rule */
3860         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3861             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3862                 REASON_SET(&reason, PFRES_SRCLIMIT);
3863                 goto csfailed;
3864         }
3865 #ifdef __FreeBSD__
3866         s = pool_get(&V_pf_state_pl, PR_NOWAIT | PR_ZERO);
3867 #else
3868         s = pool_get(&pf_state_pl, PR_NOWAIT | PR_ZERO);
3869 #endif
3870         if (s == NULL) {
3871                 REASON_SET(&reason, PFRES_MEMORY);
3872                 goto csfailed;
3873         }
3874         s->rule.ptr = r;
3875         s->nat_rule.ptr = nr;
3876         s->anchor.ptr = a;
3877         STATE_INC_COUNTERS(s);
3878         if (r->allow_opts)
3879                 s->state_flags |= PFSTATE_ALLOWOPTS;
3880         if (r->rule_flag & PFRULE_STATESLOPPY)
3881                 s->state_flags |= PFSTATE_SLOPPY;
3882         if (r->rule_flag & PFRULE_PFLOW)
3883                 s->state_flags |= PFSTATE_PFLOW;
3884         s->log = r->log & PF_LOG_ALL;
3885         s->sync_state = PFSYNC_S_NONE;
3886         if (nr != NULL)
3887                 s->log |= nr->log & PF_LOG_ALL;
3888         switch (pd->proto) {
3889         case IPPROTO_TCP:
3890                 s->src.seqlo = ntohl(th->th_seq);
3891                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3892                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3893                     r->keep_state == PF_STATE_MODULATE) {
3894                         /* Generate sequence number modulator */
3895                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3896                             0)
3897                                 s->src.seqdiff = 1;
3898                         pf_change_proto_a(m, &th->th_seq, &th->th_sum,
3899                             htonl(s->src.seqlo + s->src.seqdiff), 0);
3900                         *rewrite = 1;
3901                 } else
3902                         s->src.seqdiff = 0;
3903                 if (th->th_flags & TH_SYN) {
3904                         s->src.seqhi++;
3905                         s->src.wscale = pf_get_wscale(m, off,
3906                             th->th_off, pd->af);
3907                 }
3908                 s->src.max_win = MAX(ntohs(th->th_win), 1);
3909                 if (s->src.wscale & PF_WSCALE_MASK) {
3910                         /* Remove scale factor from initial window */
3911                         int win = s->src.max_win;
3912                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3913                         s->src.max_win = (win - 1) >>
3914                             (s->src.wscale & PF_WSCALE_MASK);
3915                 }
3916                 if (th->th_flags & TH_FIN)
3917                         s->src.seqhi++;
3918                 s->dst.seqhi = 1;
3919                 s->dst.max_win = 1;
3920                 s->src.state = TCPS_SYN_SENT;
3921                 s->dst.state = TCPS_CLOSED;
3922                 s->timeout = PFTM_TCP_FIRST_PACKET;
3923                 break;
3924         case IPPROTO_UDP:
3925                 s->src.state = PFUDPS_SINGLE;
3926                 s->dst.state = PFUDPS_NO_TRAFFIC;
3927                 s->timeout = PFTM_UDP_FIRST_PACKET;
3928                 break;
3929         case IPPROTO_ICMP:
3930 #ifdef INET6
3931         case IPPROTO_ICMPV6:
3932 #endif
3933                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3934                 break;
3935         default:
3936                 s->src.state = PFOTHERS_SINGLE;
3937                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3938                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3939         }
3940
3941         s->creation = time_second;
3942         s->expire = time_second;
3943
3944         if (sn != NULL) {
3945                 s->src_node = sn;
3946                 s->src_node->states++;
3947         }
3948         if (nsn != NULL) {
3949                 /* XXX We only modify one side for now. */
3950                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3951                 s->nat_src_node = nsn;
3952                 s->nat_src_node->states++;
3953         }
3954         if (pd->proto == IPPROTO_TCP) {
3955                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3956                     off, pd, th, &s->src, &s->dst)) {
3957                         REASON_SET(&reason, PFRES_MEMORY);
3958                         pf_src_tree_remove_state(s);
3959                         STATE_DEC_COUNTERS(s);
3960 #ifdef __FreeBSD__
3961                         pool_put(&V_pf_state_pl, s);
3962 #else
3963                         pool_put(&pf_state_pl, s);
3964 #endif
3965                         return (PF_DROP);
3966                 }
3967                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3968                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3969                     &s->src, &s->dst, rewrite)) {
3970                         /* This really shouldn't happen!!! */
3971                         DPFPRINTF(PF_DEBUG_URGENT,
3972                             ("pf_normalize_tcp_stateful failed on first pkt"));
3973                         pf_normalize_tcp_cleanup(s);
3974                         pf_src_tree_remove_state(s);
3975                         STATE_DEC_COUNTERS(s);
3976 #ifdef __FreeBSD__
3977                         pool_put(&V_pf_state_pl, s);
3978 #else
3979                         pool_put(&pf_state_pl, s);
3980 #endif
3981                         return (PF_DROP);
3982                 }
3983         }
3984         s->direction = pd->dir;
3985
3986         if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk,
3987             pd->src, pd->dst, sport, dport))
3988                 goto csfailed;
3989
3990         if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) {
3991                 if (pd->proto == IPPROTO_TCP)
3992                         pf_normalize_tcp_cleanup(s);
3993                 REASON_SET(&reason, PFRES_STATEINS);
3994                 pf_src_tree_remove_state(s);
3995                 STATE_DEC_COUNTERS(s);
3996 #ifdef __FreeBSD__
3997                 pool_put(&V_pf_state_pl, s);
3998 #else
3999                 pool_put(&pf_state_pl, s);
4000 #endif
4001                 return (PF_DROP);
4002         } else
4003                 *sm = s;
4004
4005         pf_set_rt_ifp(s, pd->src);      /* needs s->state_key set */
4006         if (tag > 0) {
4007                 pf_tag_ref(tag);
4008                 s->tag = tag;
4009         }
4010         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
4011             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
4012                 s->src.state = PF_TCPS_PROXY_SRC;
4013                 /* undo NAT changes, if they have taken place */
4014                 if (nr != NULL) {
4015                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
4016                         if (pd->dir == PF_OUT)
4017                                 skt = s->key[PF_SK_STACK];
4018                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
4019                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
4020                         if (pd->sport)
4021                                 *pd->sport = skt->port[pd->sidx];
4022                         if (pd->dport)
4023                                 *pd->dport = skt->port[pd->didx];
4024                         if (pd->proto_sum)
4025                                 *pd->proto_sum = bproto_sum;
4026                         if (pd->ip_sum)
4027                                 *pd->ip_sum = bip_sum;
4028                         m_copyback(m, off, hdrlen, pd->hdr.any);
4029                 }
4030                 s->src.seqhi = htonl(arc4random());
4031                 /* Find mss option */
4032                 int rtid = M_GETFIB(m);
4033                 mss = pf_get_mss(m, off, th->th_off, pd->af);
4034                 mss = pf_calc_mss(pd->src, pd->af, rtid, mss);
4035                 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss);
4036                 s->src.mss = mss;
4037 #ifdef __FreeBSD__
4038                 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport,
4039 #else
4040                 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport,
4041 #endif
4042                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
4043                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
4044                 REASON_SET(&reason, PFRES_SYNPROXY);
4045                 return (PF_SYNPROXY_DROP);
4046         }
4047
4048         return (PF_PASS);
4049
4050 csfailed:
4051 #ifdef __FreeBSD__
4052         if (sk != NULL)
4053                 pool_put(&V_pf_state_key_pl, sk);
4054         if (nk != NULL)
4055                 pool_put(&V_pf_state_key_pl, nk);
4056 #else
4057         if (sk != NULL)
4058                 pool_put(&pf_state_key_pl, sk);
4059         if (nk != NULL)
4060                 pool_put(&pf_state_key_pl, nk);
4061 #endif
4062
4063         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
4064 #ifdef __FreeBSD__
4065                 RB_REMOVE(pf_src_tree, &V_tree_src_tracking, sn);
4066                 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
4067                 V_pf_status.src_nodes--;
4068                 pool_put(&V_pf_src_tree_pl, sn);
4069 #else
4070                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
4071                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
4072                 pf_status.src_nodes--;
4073                 pool_put(&pf_src_tree_pl, sn);
4074 #endif
4075         }
4076         if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) {
4077 #ifdef __FreeBSD__
4078                 RB_REMOVE(pf_src_tree, &V_tree_src_tracking, nsn);
4079                 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
4080                 V_pf_status.src_nodes--;
4081                 pool_put(&V_pf_src_tree_pl, nsn);
4082 #else
4083                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
4084                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
4085                 pf_status.src_nodes--;
4086                 pool_put(&pf_src_tree_pl, nsn);
4087 #endif
4088         }
4089         return (PF_DROP);
4090 }
4091
4092 int
4093 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
4094     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
4095     struct pf_ruleset **rsm)
4096 {
4097         struct pf_rule          *r, *a = NULL;
4098         struct pf_ruleset       *ruleset = NULL;
4099         sa_family_t              af = pd->af;
4100         u_short                  reason;
4101         int                      tag = -1;
4102         int                      asd = 0;
4103         int                      match = 0;
4104
4105         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
4106         while (r != NULL) {
4107                 r->evaluations++;
4108                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
4109                         r = r->skip[PF_SKIP_IFP].ptr;
4110                 else if (r->direction && r->direction != direction)
4111                         r = r->skip[PF_SKIP_DIR].ptr;
4112                 else if (r->af && r->af != af)
4113                         r = r->skip[PF_SKIP_AF].ptr;
4114                 else if (r->proto && r->proto != pd->proto)
4115                         r = r->skip[PF_SKIP_PROTO].ptr;
4116                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
4117                     r->src.neg, kif, M_GETFIB(m)))
4118                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
4119                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
4120                     r->dst.neg, NULL, M_GETFIB(m)))
4121                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
4122                 else if (r->tos && !(r->tos == pd->tos))
4123                         r = TAILQ_NEXT(r, entries);
4124                 else if (r->os_fingerprint != PF_OSFP_ANY)
4125                         r = TAILQ_NEXT(r, entries);
4126                 else if (pd->proto == IPPROTO_UDP &&
4127                     (r->src.port_op || r->dst.port_op))
4128                         r = TAILQ_NEXT(r, entries);
4129                 else if (pd->proto == IPPROTO_TCP &&
4130                     (r->src.port_op || r->dst.port_op || r->flagset))
4131                         r = TAILQ_NEXT(r, entries);
4132                 else if ((pd->proto == IPPROTO_ICMP ||
4133                     pd->proto == IPPROTO_ICMPV6) &&
4134                     (r->type || r->code))
4135                         r = TAILQ_NEXT(r, entries);
4136                 else if (r->prob && r->prob <=
4137                     (arc4random() % (UINT_MAX - 1) + 1))
4138                         r = TAILQ_NEXT(r, entries);
4139 #ifdef __FreeBSD__
4140                 else if (r->match_tag && !pf_match_tag(m, r, &tag, pd->pf_mtag))
4141 #else
4142                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
4143 #endif
4144                         r = TAILQ_NEXT(r, entries);
4145                 else {
4146                         if (r->anchor == NULL) {
4147                                 match = 1;
4148                                 *rm = r;
4149                                 *am = a;
4150                                 *rsm = ruleset;
4151                                 if ((*rm)->quick)
4152                                         break;
4153                                 r = TAILQ_NEXT(r, entries);
4154                         } else
4155                                 pf_step_into_anchor(&asd, &ruleset,
4156                                     PF_RULESET_FILTER, &r, &a, &match);
4157                 }
4158                 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
4159                     PF_RULESET_FILTER, &r, &a, &match))
4160                         break;
4161         }
4162         r = *rm;
4163         a = *am;
4164         ruleset = *rsm;
4165
4166         REASON_SET(&reason, PFRES_MATCH);
4167
4168         if (r->log)
4169                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
4170                     pd);
4171
4172         if (r->action != PF_PASS)
4173                 return (PF_DROP);
4174
4175 #ifdef __FreeBSD__
4176         if (pf_tag_packet(m, tag, -1, pd->pf_mtag)) {
4177 #else
4178         if (pf_tag_packet(m, tag, -1)) {
4179 #endif
4180                 REASON_SET(&reason, PFRES_MEMORY);
4181                 return (PF_DROP);
4182         }
4183
4184         return (PF_PASS);
4185 }
4186
4187 int
4188 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
4189         struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
4190         struct pf_pdesc *pd, u_short *reason, int *copyback)
4191 {
4192         struct tcphdr           *th = pd->hdr.tcp;
4193         u_int16_t                win = ntohs(th->th_win);
4194         u_int32_t                ack, end, seq, orig_seq;
4195         u_int8_t                 sws, dws;
4196         int                      ackskew;
4197
4198         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
4199                 sws = src->wscale & PF_WSCALE_MASK;
4200                 dws = dst->wscale & PF_WSCALE_MASK;
4201         } else
4202                 sws = dws = 0;
4203
4204         /*
4205          * Sequence tracking algorithm from Guido van Rooij's paper:
4206          *   http://www.madison-gurkha.com/publications/tcp_filtering/
4207          *      tcp_filtering.ps
4208          */
4209
4210         orig_seq = seq = ntohl(th->th_seq);
4211         if (src->seqlo == 0) {
4212                 /* First packet from this end. Set its state */
4213
4214                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
4215                     src->scrub == NULL) {
4216                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
4217                                 REASON_SET(reason, PFRES_MEMORY);
4218                                 return (PF_DROP);
4219                         }
4220                 }
4221
4222                 /* Deferred generation of sequence number modulator */
4223                 if (dst->seqdiff && !src->seqdiff) {
4224                         /* use random iss for the TCP server */
4225                         while ((src->seqdiff = arc4random() - seq) == 0)
4226                                 ;
4227                         ack = ntohl(th->th_ack) - dst->seqdiff;
4228                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
4229                             src->seqdiff), 0);
4230                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
4231                         *copyback = 1;
4232                 } else {
4233                         ack = ntohl(th->th_ack);
4234                 }
4235
4236                 end = seq + pd->p_len;
4237                 if (th->th_flags & TH_SYN) {
4238                         end++;
4239                         if (dst->wscale & PF_WSCALE_FLAG) {
4240                                 src->wscale = pf_get_wscale(m, off, th->th_off,
4241                                     pd->af);
4242                                 if (src->wscale & PF_WSCALE_FLAG) {
4243                                         /* Remove scale factor from initial
4244                                          * window */
4245                                         sws = src->wscale & PF_WSCALE_MASK;
4246                                         win = ((u_int32_t)win + (1 << sws) - 1)
4247                                             >> sws;
4248                                         dws = dst->wscale & PF_WSCALE_MASK;
4249                                 } else {
4250                                         /* fixup other window */
4251                                         dst->max_win <<= dst->wscale &
4252                                             PF_WSCALE_MASK;
4253                                         /* in case of a retrans SYN|ACK */
4254                                         dst->wscale = 0;
4255                                 }
4256                         }
4257                 }
4258                 if (th->th_flags & TH_FIN)
4259                         end++;
4260
4261                 src->seqlo = seq;
4262                 if (src->state < TCPS_SYN_SENT)
4263                         src->state = TCPS_SYN_SENT;
4264
4265                 /*
4266                  * May need to slide the window (seqhi may have been set by
4267                  * the crappy stack check or if we picked up the connection
4268                  * after establishment)
4269                  */
4270                 if (src->seqhi == 1 ||
4271                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
4272                         src->seqhi = end + MAX(1, dst->max_win << dws);
4273                 if (win > src->max_win)
4274                         src->max_win = win;
4275
4276         } else {
4277                 ack = ntohl(th->th_ack) - dst->seqdiff;
4278                 if (src->seqdiff) {
4279                         /* Modulate sequence numbers */
4280                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
4281                             src->seqdiff), 0);
4282                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
4283                         *copyback = 1;
4284                 }
4285                 end = seq + pd->p_len;
4286                 if (th->th_flags & TH_SYN)
4287                         end++;
4288                 if (th->th_flags & TH_FIN)
4289                         end++;
4290         }
4291
4292         if ((th->th_flags & TH_ACK) == 0) {
4293                 /* Let it pass through the ack skew check */
4294                 ack = dst->seqlo;
4295         } else if ((ack == 0 &&
4296             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
4297             /* broken tcp stacks do not set ack */
4298             (dst->state < TCPS_SYN_SENT)) {
4299                 /*
4300                  * Many stacks (ours included) will set the ACK number in an
4301                  * FIN|ACK if the SYN times out -- no sequence to ACK.
4302                  */
4303                 ack = dst->seqlo;
4304         }
4305
4306         if (seq == end) {
4307                 /* Ease sequencing restrictions on no data packets */
4308                 seq = src->seqlo;
4309                 end = seq;
4310         }
4311
4312         ackskew = dst->seqlo - ack;
4313
4314
4315         /*
4316          * Need to demodulate the sequence numbers in any TCP SACK options
4317          * (Selective ACK). We could optionally validate the SACK values
4318          * against the current ACK window, either forwards or backwards, but
4319          * I'm not confident that SACK has been implemented properly
4320          * everywhere. It wouldn't surprise me if several stacks accidently
4321          * SACK too far backwards of previously ACKed data. There really aren't
4322          * any security implications of bad SACKing unless the target stack
4323          * doesn't validate the option length correctly. Someone trying to
4324          * spoof into a TCP connection won't bother blindly sending SACK
4325          * options anyway.
4326          */
4327         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4328                 if (pf_modulate_sack(m, off, pd, th, dst))
4329                         *copyback = 1;
4330         }
4331
4332
4333 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
4334         if (SEQ_GEQ(src->seqhi, end) &&
4335             /* Last octet inside other's window space */
4336             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4337             /* Retrans: not more than one window back */
4338             (ackskew >= -MAXACKWINDOW) &&
4339             /* Acking not more than one reassembled fragment backwards */
4340             (ackskew <= (MAXACKWINDOW << sws)) &&
4341             /* Acking not more than one window forward */
4342             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4343             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4344             (pd->flags & PFDESC_IP_REAS) == 0)) {
4345             /* Require an exact/+1 sequence match on resets when possible */
4346
4347                 if (dst->scrub || src->scrub) {
4348                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4349                             *state, src, dst, copyback))
4350                                 return (PF_DROP);
4351                 }
4352
4353                 /* update max window */
4354                 if (src->max_win < win)
4355                         src->max_win = win;
4356                 /* synchronize sequencing */
4357                 if (SEQ_GT(end, src->seqlo))
4358                         src->seqlo = end;
4359                 /* slide the window of what the other end can send */
4360                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4361                         dst->seqhi = ack + MAX((win << sws), 1);
4362
4363
4364                 /* update states */
4365                 if (th->th_flags & TH_SYN)
4366                         if (src->state < TCPS_SYN_SENT)
4367                                 src->state = TCPS_SYN_SENT;
4368                 if (th->th_flags & TH_FIN)
4369                         if (src->state < TCPS_CLOSING)
4370                                 src->state = TCPS_CLOSING;
4371                 if (th->th_flags & TH_ACK) {
4372                         if (dst->state == TCPS_SYN_SENT) {
4373                                 dst->state = TCPS_ESTABLISHED;
4374                                 if (src->state == TCPS_ESTABLISHED &&
4375                                     (*state)->src_node != NULL &&
4376                                     pf_src_connlimit(state)) {
4377                                         REASON_SET(reason, PFRES_SRCLIMIT);
4378                                         return (PF_DROP);
4379                                 }
4380                         } else if (dst->state == TCPS_CLOSING)
4381                                 dst->state = TCPS_FIN_WAIT_2;
4382                 }
4383                 if (th->th_flags & TH_RST)
4384                         src->state = dst->state = TCPS_TIME_WAIT;
4385
4386                 /* update expire time */
4387                 (*state)->expire = time_second;
4388                 if (src->state >= TCPS_FIN_WAIT_2 &&
4389                     dst->state >= TCPS_FIN_WAIT_2)
4390                         (*state)->timeout = PFTM_TCP_CLOSED;
4391                 else if (src->state >= TCPS_CLOSING &&
4392                     dst->state >= TCPS_CLOSING)
4393                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
4394                 else if (src->state < TCPS_ESTABLISHED ||
4395                     dst->state < TCPS_ESTABLISHED)
4396                         (*state)->timeout = PFTM_TCP_OPENING;
4397                 else if (src->state >= TCPS_CLOSING ||
4398                     dst->state >= TCPS_CLOSING)
4399                         (*state)->timeout = PFTM_TCP_CLOSING;
4400                 else
4401                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4402
4403                 /* Fall through to PASS packet */
4404
4405         } else if ((dst->state < TCPS_SYN_SENT ||
4406                 dst->state >= TCPS_FIN_WAIT_2 ||
4407                 src->state >= TCPS_FIN_WAIT_2) &&
4408             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4409             /* Within a window forward of the originating packet */
4410             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4411             /* Within a window backward of the originating packet */
4412
4413                 /*
4414                  * This currently handles three situations:
4415                  *  1) Stupid stacks will shotgun SYNs before their peer
4416                  *     replies.
4417                  *  2) When PF catches an already established stream (the
4418                  *     firewall rebooted, the state table was flushed, routes
4419                  *     changed...)
4420                  *  3) Packets get funky immediately after the connection
4421                  *     closes (this should catch Solaris spurious ACK|FINs
4422                  *     that web servers like to spew after a close)
4423                  *
4424                  * This must be a little more careful than the above code
4425                  * since packet floods will also be caught here. We don't
4426                  * update the TTL here to mitigate the damage of a packet
4427                  * flood and so the same code can handle awkward establishment
4428                  * and a loosened connection close.
4429                  * In the establishment case, a correct peer response will
4430                  * validate the connection, go through the normal state code
4431                  * and keep updating the state TTL.
4432                  */
4433
4434 #ifdef __FreeBSD__
4435                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4436 #else
4437                 if (pf_status.debug >= PF_DEBUG_MISC) {
4438 #endif
4439                         printf("pf: loose state match: ");
4440                         pf_print_state(*state);
4441                         pf_print_flags(th->th_flags);
4442                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4443                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
4444 #ifdef __FreeBSD__
4445                             pd->p_len, ackskew, (unsigned long long)(*state)->packets[0],
4446                             (unsigned long long)(*state)->packets[1],
4447 #else
4448                             pd->p_len, ackskew, (*state)->packets[0],
4449                             (*state)->packets[1],
4450 #endif
4451                             pd->dir == PF_IN ? "in" : "out",
4452                             pd->dir == (*state)->direction ? "fwd" : "rev");
4453                 }
4454
4455                 if (dst->scrub || src->scrub) {
4456                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4457                             *state, src, dst, copyback))
4458                                 return (PF_DROP);
4459                 }
4460
4461                 /* update max window */
4462                 if (src->max_win < win)
4463                         src->max_win = win;
4464                 /* synchronize sequencing */
4465                 if (SEQ_GT(end, src->seqlo))
4466                         src->seqlo = end;
4467                 /* slide the window of what the other end can send */
4468                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4469                         dst->seqhi = ack + MAX((win << sws), 1);
4470
4471                 /*
4472                  * Cannot set dst->seqhi here since this could be a shotgunned
4473                  * SYN and not an already established connection.
4474                  */
4475
4476                 if (th->th_flags & TH_FIN)
4477                         if (src->state < TCPS_CLOSING)
4478                                 src->state = TCPS_CLOSING;
4479                 if (th->th_flags & TH_RST)
4480                         src->state = dst->state = TCPS_TIME_WAIT;
4481
4482                 /* Fall through to PASS packet */
4483
4484         } else {
4485                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4486                     (*state)->src.state == TCPS_SYN_SENT) {
4487                         /* Send RST for state mismatches during handshake */
4488                         if (!(th->th_flags & TH_RST))
4489 #ifdef __FreeBSD__
4490                                 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4491 #else
4492                                 pf_send_tcp((*state)->rule.ptr, pd->af,
4493 #endif
4494                                     pd->dst, pd->src, th->th_dport,
4495                                     th->th_sport, ntohl(th->th_ack), 0,
4496                                     TH_RST, 0, 0,
4497                                     (*state)->rule.ptr->return_ttl, 1, 0,
4498                                     pd->eh, kif->pfik_ifp);
4499                         src->seqlo = 0;
4500                         src->seqhi = 1;
4501                         src->max_win = 1;
4502 #ifdef __FreeBSD__
4503                 } else if (V_pf_status.debug >= PF_DEBUG_MISC) {
4504 #else
4505                 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4506 #endif
4507                         printf("pf: BAD state: ");
4508                         pf_print_state(*state);
4509                         pf_print_flags(th->th_flags);
4510                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4511                             "pkts=%llu:%llu dir=%s,%s\n",
4512                             seq, orig_seq, ack, pd->p_len, ackskew,
4513 #ifdef __FreeBSD__
4514                             (unsigned long long)(*state)->packets[0],
4515                             (unsigned long long)(*state)->packets[1],
4516 #else
4517                             (*state)->packets[0], (*state)->packets[1],
4518 #endif
4519                             pd->dir == PF_IN ? "in" : "out",
4520                             pd->dir == (*state)->direction ? "fwd" : "rev");
4521                         printf("pf: State failure on: %c %c %c %c | %c %c\n",
4522                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4523                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4524                             ' ': '2',
4525                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4526                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4527                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4528                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4529                 }
4530                 REASON_SET(reason, PFRES_BADSTATE);
4531                 return (PF_DROP);
4532         }
4533
4534         return (PF_PASS);
4535 }
4536
4537 int
4538 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4539         struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4540 {
4541         struct tcphdr           *th = pd->hdr.tcp;
4542
4543         if (th->th_flags & TH_SYN)
4544                 if (src->state < TCPS_SYN_SENT)
4545                         src->state = TCPS_SYN_SENT;
4546         if (th->th_flags & TH_FIN)
4547                 if (src->state < TCPS_CLOSING)
4548                         src->state = TCPS_CLOSING;
4549         if (th->th_flags & TH_ACK) {
4550                 if (dst->state == TCPS_SYN_SENT) {
4551                         dst->state = TCPS_ESTABLISHED;
4552                         if (src->state == TCPS_ESTABLISHED &&
4553                             (*state)->src_node != NULL &&
4554                             pf_src_connlimit(state)) {
4555                                 REASON_SET(reason, PFRES_SRCLIMIT);
4556                                 return (PF_DROP);
4557                         }
4558                 } else if (dst->state == TCPS_CLOSING) {
4559                         dst->state = TCPS_FIN_WAIT_2;
4560                 } else if (src->state == TCPS_SYN_SENT &&
4561                     dst->state < TCPS_SYN_SENT) {
4562                         /*
4563                          * Handle a special sloppy case where we only see one
4564                          * half of the connection. If there is a ACK after
4565                          * the initial SYN without ever seeing a packet from
4566                          * the destination, set the connection to established.
4567                          */
4568                         dst->state = src->state = TCPS_ESTABLISHED;
4569                         if ((*state)->src_node != NULL &&
4570                             pf_src_connlimit(state)) {
4571                                 REASON_SET(reason, PFRES_SRCLIMIT);
4572                                 return (PF_DROP);
4573                         }
4574                 } else if (src->state == TCPS_CLOSING &&
4575                     dst->state == TCPS_ESTABLISHED &&
4576                     dst->seqlo == 0) {
4577                         /*
4578                          * Handle the closing of half connections where we
4579                          * don't see the full bidirectional FIN/ACK+ACK
4580                          * handshake.
4581                          */
4582                         dst->state = TCPS_CLOSING;
4583                 }
4584         }
4585         if (th->th_flags & TH_RST)
4586                 src->state = dst->state = TCPS_TIME_WAIT;
4587
4588         /* update expire time */
4589         (*state)->expire = time_second;
4590         if (src->state >= TCPS_FIN_WAIT_2 &&
4591             dst->state >= TCPS_FIN_WAIT_2)
4592                 (*state)->timeout = PFTM_TCP_CLOSED;
4593         else if (src->state >= TCPS_CLOSING &&
4594             dst->state >= TCPS_CLOSING)
4595                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4596         else if (src->state < TCPS_ESTABLISHED ||
4597             dst->state < TCPS_ESTABLISHED)
4598                 (*state)->timeout = PFTM_TCP_OPENING;
4599         else if (src->state >= TCPS_CLOSING ||
4600             dst->state >= TCPS_CLOSING)
4601                 (*state)->timeout = PFTM_TCP_CLOSING;
4602         else
4603                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4604
4605         return (PF_PASS);
4606 }
4607
4608 int
4609 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4610     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4611     u_short *reason)
4612 {
4613         struct pf_state_key_cmp  key;
4614         struct tcphdr           *th = pd->hdr.tcp;
4615         int                      copyback = 0;
4616         struct pf_state_peer    *src, *dst;
4617         struct pf_state_key     *sk;
4618
4619         key.af = pd->af;
4620         key.proto = IPPROTO_TCP;
4621         if (direction == PF_IN) {       /* wire side, straight */
4622                 PF_ACPY(&key.addr[0], pd->src, key.af);
4623                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4624                 key.port[0] = th->th_sport;
4625                 key.port[1] = th->th_dport;
4626         } else {                        /* stack side, reverse */
4627                 PF_ACPY(&key.addr[1], pd->src, key.af);
4628                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4629                 key.port[1] = th->th_sport;
4630                 key.port[0] = th->th_dport;
4631         }
4632
4633 #ifdef __FreeBSD__
4634         STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag);
4635 #else
4636         STATE_LOOKUP(kif, &key, direction, *state, m);
4637 #endif
4638
4639         if (direction == (*state)->direction) {
4640                 src = &(*state)->src;
4641                 dst = &(*state)->dst;
4642         } else {
4643                 src = &(*state)->dst;
4644                 dst = &(*state)->src;
4645         }
4646
4647         sk = (*state)->key[pd->didx];
4648
4649         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4650                 if (direction != (*state)->direction) {
4651                         REASON_SET(reason, PFRES_SYNPROXY);
4652                         return (PF_SYNPROXY_DROP);
4653                 }
4654                 if (th->th_flags & TH_SYN) {
4655                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4656                                 REASON_SET(reason, PFRES_SYNPROXY);
4657                                 return (PF_DROP);
4658                         }
4659 #ifdef __FreeBSD__
4660                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4661 #else
4662                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4663 #endif
4664                             pd->src, th->th_dport, th->th_sport,
4665                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4666                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
4667                             0, NULL, NULL);
4668                         REASON_SET(reason, PFRES_SYNPROXY);
4669                         return (PF_SYNPROXY_DROP);
4670                 } else if (!(th->th_flags & TH_ACK) ||
4671                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4672                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4673                         REASON_SET(reason, PFRES_SYNPROXY);
4674                         return (PF_DROP);
4675                 } else if ((*state)->src_node != NULL &&
4676                     pf_src_connlimit(state)) {
4677                         REASON_SET(reason, PFRES_SRCLIMIT);
4678                         return (PF_DROP);
4679                 } else
4680                         (*state)->src.state = PF_TCPS_PROXY_DST;
4681         }
4682         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4683                 if (direction == (*state)->direction) {
4684                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4685                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4686                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4687                                 REASON_SET(reason, PFRES_SYNPROXY);
4688                                 return (PF_DROP);
4689                         }
4690                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4691                         if ((*state)->dst.seqhi == 1)
4692                                 (*state)->dst.seqhi = htonl(arc4random());
4693 #ifdef __FreeBSD__
4694                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4695 #else
4696                         pf_send_tcp((*state)->rule.ptr, pd->af,
4697 #endif
4698                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4699                             sk->port[pd->sidx], sk->port[pd->didx],
4700                             (*state)->dst.seqhi, 0, TH_SYN, 0,
4701                             (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
4702                         REASON_SET(reason, PFRES_SYNPROXY);
4703                         return (PF_SYNPROXY_DROP);
4704                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4705                     (TH_SYN|TH_ACK)) ||
4706                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4707                         REASON_SET(reason, PFRES_SYNPROXY);
4708                         return (PF_DROP);
4709                 } else {
4710                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4711                         (*state)->dst.seqlo = ntohl(th->th_seq);
4712 #ifdef __FreeBSD__
4713                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4714 #else
4715                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4716 #endif
4717                             pd->src, th->th_dport, th->th_sport,
4718                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4719                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
4720                             (*state)->tag, NULL, NULL);
4721 #ifdef __FreeBSD__
4722                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4723 #else
4724                         pf_send_tcp((*state)->rule.ptr, pd->af,
4725 #endif
4726                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4727                             sk->port[pd->sidx], sk->port[pd->didx],
4728                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4729                             TH_ACK, (*state)->dst.max_win, 0, 0, 1,
4730                             0, NULL, NULL);
4731                         (*state)->src.seqdiff = (*state)->dst.seqhi -
4732                             (*state)->src.seqlo;
4733                         (*state)->dst.seqdiff = (*state)->src.seqhi -
4734                             (*state)->dst.seqlo;
4735                         (*state)->src.seqhi = (*state)->src.seqlo +
4736                             (*state)->dst.max_win;
4737                         (*state)->dst.seqhi = (*state)->dst.seqlo +
4738                             (*state)->src.max_win;
4739                         (*state)->src.wscale = (*state)->dst.wscale = 0;
4740                         (*state)->src.state = (*state)->dst.state =
4741                             TCPS_ESTABLISHED;
4742                         REASON_SET(reason, PFRES_SYNPROXY);
4743                         return (PF_SYNPROXY_DROP);
4744                 }
4745         }
4746
4747         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4748             dst->state >= TCPS_FIN_WAIT_2 &&
4749             src->state >= TCPS_FIN_WAIT_2) {
4750 #ifdef __FreeBSD__
4751                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4752 #else
4753                 if (pf_status.debug >= PF_DEBUG_MISC) {
4754 #endif
4755                         printf("pf: state reuse ");
4756                         pf_print_state(*state);
4757                         pf_print_flags(th->th_flags);
4758                         printf("\n");
4759                 }
4760                 /* XXX make sure it's the same direction ?? */
4761                 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4762                 pf_unlink_state(*state);
4763                 *state = NULL;
4764                 return (PF_DROP);
4765         }
4766
4767         if ((*state)->state_flags & PFSTATE_SLOPPY) {
4768                 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4769                         return (PF_DROP);
4770         } else {
4771                 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4772                     &copyback) == PF_DROP)
4773                         return (PF_DROP);
4774         }
4775
4776         /* translate source/destination address, if necessary */
4777         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4778                 struct pf_state_key *nk = (*state)->key[pd->didx];
4779
4780                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4781                     nk->port[pd->sidx] != th->th_sport)
4782                         pf_change_ap(m, pd->src, &th->th_sport,
4783                             pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx],
4784                             nk->port[pd->sidx], 0, pd->af);
4785
4786                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4787                     nk->port[pd->didx] != th->th_dport)
4788                         pf_change_ap(m, pd->dst, &th->th_dport,
4789                             pd->ip_sum, &th->th_sum, &nk->addr[pd->didx],
4790                             nk->port[pd->didx], 0, pd->af);
4791                 copyback = 1;
4792         }
4793
4794         /* Copyback sequence modulation or stateful scrub changes if needed */
4795         if (copyback)
4796 #ifdef __FreeBSD__
4797                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4798 #else
4799                 m_copyback(m, off, sizeof(*th), th);
4800 #endif
4801
4802         return (PF_PASS);
4803 }
4804
4805 int
4806 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4807     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4808 {
4809         struct pf_state_peer    *src, *dst;
4810         struct pf_state_key_cmp  key;
4811         struct udphdr           *uh = pd->hdr.udp;
4812
4813         key.af = pd->af;
4814         key.proto = IPPROTO_UDP;
4815         if (direction == PF_IN) {       /* wire side, straight */
4816                 PF_ACPY(&key.addr[0], pd->src, key.af);
4817                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4818                 key.port[0] = uh->uh_sport;
4819                 key.port[1] = uh->uh_dport;
4820         } else {                        /* stack side, reverse */
4821                 PF_ACPY(&key.addr[1], pd->src, key.af);
4822                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4823                 key.port[1] = uh->uh_sport;
4824                 key.port[0] = uh->uh_dport;
4825         }
4826
4827 #ifdef __FreeBSD__
4828         STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag);
4829 #else
4830         STATE_LOOKUP(kif, &key, direction, *state, m);
4831 #endif
4832
4833         if (direction == (*state)->direction) {
4834                 src = &(*state)->src;
4835                 dst = &(*state)->dst;
4836         } else {
4837                 src = &(*state)->dst;
4838                 dst = &(*state)->src;
4839         }
4840
4841         /* update states */
4842         if (src->state < PFUDPS_SINGLE)
4843                 src->state = PFUDPS_SINGLE;
4844         if (dst->state == PFUDPS_SINGLE)
4845                 dst->state = PFUDPS_MULTIPLE;
4846
4847         /* update expire time */
4848         (*state)->expire = time_second;
4849         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4850                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4851         else
4852                 (*state)->timeout = PFTM_UDP_SINGLE;
4853
4854         /* translate source/destination address, if necessary */
4855         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4856                 struct pf_state_key *nk = (*state)->key[pd->didx];
4857
4858                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4859                     nk->port[pd->sidx] != uh->uh_sport)
4860                         pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum,
4861                             &uh->uh_sum, &nk->addr[pd->sidx],
4862                             nk->port[pd->sidx], 1, pd->af);
4863
4864                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4865                     nk->port[pd->didx] != uh->uh_dport)
4866                         pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum,
4867                             &uh->uh_sum, &nk->addr[pd->didx],
4868                             nk->port[pd->didx], 1, pd->af);
4869 #ifdef __FreeBSD__
4870                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4871 #else
4872                 m_copyback(m, off, sizeof(*uh), uh);
4873 #endif
4874         }
4875
4876         return (PF_PASS);
4877 }
4878
4879 int
4880 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4881     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4882 {
4883         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4884 #ifdef __FreeBSD__
4885         u_int16_t        icmpid = 0, *icmpsum;
4886 #else
4887         u_int16_t        icmpid, *icmpsum;
4888 #endif
4889         u_int8_t         icmptype;
4890         int              state_icmp = 0;
4891         struct pf_state_key_cmp key;
4892
4893         switch (pd->proto) {
4894 #ifdef INET
4895         case IPPROTO_ICMP:
4896                 icmptype = pd->hdr.icmp->icmp_type;
4897                 icmpid = pd->hdr.icmp->icmp_id;
4898                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4899
4900                 if (icmptype == ICMP_UNREACH ||
4901                     icmptype == ICMP_SOURCEQUENCH ||
4902                     icmptype == ICMP_REDIRECT ||
4903                     icmptype == ICMP_TIMXCEED ||
4904                     icmptype == ICMP_PARAMPROB)
4905                         state_icmp++;
4906                 break;
4907 #endif /* INET */
4908 #ifdef INET6
4909         case IPPROTO_ICMPV6:
4910                 icmptype = pd->hdr.icmp6->icmp6_type;
4911                 icmpid = pd->hdr.icmp6->icmp6_id;
4912                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4913
4914                 if (icmptype == ICMP6_DST_UNREACH ||
4915                     icmptype == ICMP6_PACKET_TOO_BIG ||
4916                     icmptype == ICMP6_TIME_EXCEEDED ||
4917                     icmptype == ICMP6_PARAM_PROB)
4918                         state_icmp++;
4919                 break;
4920 #endif /* INET6 */
4921         }
4922
4923         if (!state_icmp) {
4924
4925                 /*
4926                  * ICMP query/reply message not related to a TCP/UDP packet.
4927                  * Search for an ICMP state.
4928                  */
4929                 key.af = pd->af;
4930                 key.proto = pd->proto;
4931                 key.port[0] = key.port[1] = icmpid;
4932                 if (direction == PF_IN) {       /* wire side, straight */
4933                         PF_ACPY(&key.addr[0], pd->src, key.af);
4934                         PF_ACPY(&key.addr[1], pd->dst, key.af);
4935                 } else {                        /* stack side, reverse */
4936                         PF_ACPY(&key.addr[1], pd->src, key.af);
4937                         PF_ACPY(&key.addr[0], pd->dst, key.af);
4938                 }
4939
4940 #ifdef __FreeBSD__
4941                 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag);
4942 #else
4943                 STATE_LOOKUP(kif, &key, direction, *state, m);
4944 #endif
4945
4946                 (*state)->expire = time_second;
4947                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4948
4949                 /* translate source/destination address, if necessary */
4950                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4951                         struct pf_state_key *nk = (*state)->key[pd->didx];
4952
4953                         switch (pd->af) {
4954 #ifdef INET
4955                         case AF_INET:
4956                                 if (PF_ANEQ(pd->src,
4957                                     &nk->addr[pd->sidx], AF_INET))
4958                                         pf_change_a(&saddr->v4.s_addr,
4959                                             pd->ip_sum,
4960                                             nk->addr[pd->sidx].v4.s_addr, 0);
4961
4962                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4963                                     AF_INET))
4964                                         pf_change_a(&daddr->v4.s_addr,
4965                                             pd->ip_sum,
4966                                             nk->addr[pd->didx].v4.s_addr, 0);
4967
4968                                 if (nk->port[0] !=
4969                                     pd->hdr.icmp->icmp_id) {
4970                                         pd->hdr.icmp->icmp_cksum =
4971                                             pf_cksum_fixup(
4972                                             pd->hdr.icmp->icmp_cksum, icmpid,
4973                                             nk->port[pd->sidx], 0);
4974                                         pd->hdr.icmp->icmp_id =
4975                                             nk->port[pd->sidx];
4976                                 }
4977
4978                                 m_copyback(m, off, ICMP_MINLEN,
4979 #ifdef __FreeBSD__
4980                                     (caddr_t)
4981 #endif
4982                                     pd->hdr.icmp);
4983                                 break;
4984 #endif /* INET */
4985 #ifdef INET6
4986                         case AF_INET6:
4987                                 if (PF_ANEQ(pd->src,
4988                                     &nk->addr[pd->sidx], AF_INET6))
4989                                         pf_change_a6(saddr,
4990                                             &pd->hdr.icmp6->icmp6_cksum,
4991                                             &nk->addr[pd->sidx], 0);
4992
4993                                 if (PF_ANEQ(pd->dst,
4994                                     &nk->addr[pd->didx], AF_INET6))
4995                                         pf_change_a6(daddr,
4996                                             &pd->hdr.icmp6->icmp6_cksum,
4997                                             &nk->addr[pd->didx], 0);
4998
4999                                 m_copyback(m, off,
5000                                     sizeof(struct icmp6_hdr),
5001 #ifdef __FreeBSD__
5002                                     (caddr_t)
5003 #endif
5004                                     pd->hdr.icmp6);
5005                                 break;
5006 #endif /* INET6 */
5007                         }
5008                 }
5009                 return (PF_PASS);
5010
5011         } else {
5012                 /*
5013                  * ICMP error message in response to a TCP/UDP packet.
5014                  * Extract the inner TCP/UDP header and search for that state.
5015                  */
5016
5017                 struct pf_pdesc pd2;
5018 #ifdef __FreeBSD__
5019                 bzero(&pd2, sizeof pd2);
5020 #endif
5021 #ifdef INET
5022                 struct ip       h2;
5023 #endif /* INET */
5024 #ifdef INET6
5025                 struct ip6_hdr  h2_6;
5026                 int             terminal = 0;
5027 #endif /* INET6 */
5028 #ifdef __FreeBSD__
5029                 int             ipoff2 = 0;
5030                 int             off2 = 0;
5031 #else
5032                 int             ipoff2;
5033                 int             off2;
5034 #endif
5035
5036                 pd2.af = pd->af;
5037                 /* Payload packet is from the opposite direction. */
5038                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
5039                 pd2.didx = (direction == PF_IN) ? 0 : 1;
5040                 switch (pd->af) {
5041 #ifdef INET
5042                 case AF_INET:
5043                         /* offset of h2 in mbuf chain */
5044                         ipoff2 = off + ICMP_MINLEN;
5045
5046                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
5047                             NULL, reason, pd2.af)) {
5048                                 DPFPRINTF(PF_DEBUG_MISC,
5049                                     ("pf: ICMP error message too short "
5050                                     "(ip)\n"));
5051                                 return (PF_DROP);
5052                         }
5053                         /*
5054                          * ICMP error messages don't refer to non-first
5055                          * fragments
5056                          */
5057                         if (h2.ip_off & htons(IP_OFFMASK)) {
5058                                 REASON_SET(reason, PFRES_FRAG);
5059                                 return (PF_DROP);
5060                         }
5061
5062                         /* offset of protocol header that follows h2 */
5063                         off2 = ipoff2 + (h2.ip_hl << 2);
5064
5065                         pd2.proto = h2.ip_p;
5066                         pd2.src = (struct pf_addr *)&h2.ip_src;
5067                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
5068                         pd2.ip_sum = &h2.ip_sum;
5069                         break;
5070 #endif /* INET */
5071 #ifdef INET6
5072                 case AF_INET6:
5073                         ipoff2 = off + sizeof(struct icmp6_hdr);
5074
5075                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
5076                             NULL, reason, pd2.af)) {
5077                                 DPFPRINTF(PF_DEBUG_MISC,
5078                                     ("pf: ICMP error message too short "
5079                                     "(ip6)\n"));
5080                                 return (PF_DROP);
5081                         }
5082                         pd2.proto = h2_6.ip6_nxt;
5083                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
5084                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
5085                         pd2.ip_sum = NULL;
5086                         off2 = ipoff2 + sizeof(h2_6);
5087                         do {
5088                                 switch (pd2.proto) {
5089                                 case IPPROTO_FRAGMENT:
5090                                         /*
5091                                          * ICMPv6 error messages for
5092                                          * non-first fragments
5093                                          */
5094                                         REASON_SET(reason, PFRES_FRAG);
5095                                         return (PF_DROP);
5096                                 case IPPROTO_AH:
5097                                 case IPPROTO_HOPOPTS:
5098                                 case IPPROTO_ROUTING:
5099                                 case IPPROTO_DSTOPTS: {
5100                                         /* get next header and header length */
5101                                         struct ip6_ext opt6;
5102
5103                                         if (!pf_pull_hdr(m, off2, &opt6,
5104                                             sizeof(opt6), NULL, reason,
5105                                             pd2.af)) {
5106                                                 DPFPRINTF(PF_DEBUG_MISC,
5107                                                     ("pf: ICMPv6 short opt\n"));
5108                                                 return (PF_DROP);
5109                                         }
5110                                         if (pd2.proto == IPPROTO_AH)
5111                                                 off2 += (opt6.ip6e_len + 2) * 4;
5112                                         else
5113                                                 off2 += (opt6.ip6e_len + 1) * 8;
5114                                         pd2.proto = opt6.ip6e_nxt;
5115                                         /* goto the next header */
5116                                         break;
5117                                 }
5118                                 default:
5119                                         terminal++;
5120                                         break;
5121                                 }
5122                         } while (!terminal);
5123                         break;
5124 #endif /* INET6 */
5125                 }
5126
5127                 switch (pd2.proto) {
5128                 case IPPROTO_TCP: {
5129                         struct tcphdr            th;
5130                         u_int32_t                seq;
5131                         struct pf_state_peer    *src, *dst;
5132                         u_int8_t                 dws;
5133                         int                      copyback = 0;
5134
5135                         /*
5136                          * Only the first 8 bytes of the TCP header can be
5137                          * expected. Don't access any TCP header fields after
5138                          * th_seq, an ackskew test is not possible.
5139                          */
5140                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
5141                             pd2.af)) {
5142                                 DPFPRINTF(PF_DEBUG_MISC,
5143                                     ("pf: ICMP error message too short "
5144                                     "(tcp)\n"));
5145                                 return (PF_DROP);
5146                         }
5147
5148                         key.af = pd2.af;
5149                         key.proto = IPPROTO_TCP;
5150                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5151                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5152                         key.port[pd2.sidx] = th.th_sport;
5153                         key.port[pd2.didx] = th.th_dport;
5154
5155 #ifdef __FreeBSD__
5156                         STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag);
5157 #else
5158                         STATE_LOOKUP(kif, &key, direction, *state, m);
5159 #endif
5160
5161                         if (direction == (*state)->direction) {
5162                                 src = &(*state)->dst;
5163                                 dst = &(*state)->src;
5164                         } else {
5165                                 src = &(*state)->src;
5166                                 dst = &(*state)->dst;
5167                         }
5168
5169                         if (src->wscale && dst->wscale)
5170                                 dws = dst->wscale & PF_WSCALE_MASK;
5171                         else
5172                                 dws = 0;
5173
5174                         /* Demodulate sequence number */
5175                         seq = ntohl(th.th_seq) - src->seqdiff;
5176                         if (src->seqdiff) {
5177                                 pf_change_a(&th.th_seq, icmpsum,
5178                                     htonl(seq), 0);
5179                                 copyback = 1;
5180                         }
5181
5182                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
5183                             (!SEQ_GEQ(src->seqhi, seq) ||
5184                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
5185 #ifdef __FreeBSD__
5186                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
5187 #else
5188                                 if (pf_status.debug >= PF_DEBUG_MISC) {
5189 #endif
5190                                         printf("pf: BAD ICMP %d:%d ",
5191                                             icmptype, pd->hdr.icmp->icmp_code);
5192                                         pf_print_host(pd->src, 0, pd->af);
5193                                         printf(" -> ");
5194                                         pf_print_host(pd->dst, 0, pd->af);
5195                                         printf(" state: ");
5196                                         pf_print_state(*state);
5197                                         printf(" seq=%u\n", seq);
5198                                 }
5199                                 REASON_SET(reason, PFRES_BADSTATE);
5200                                 return (PF_DROP);
5201                         } else {
5202 #ifdef __FreeBSD__
5203                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
5204 #else
5205                                 if (pf_status.debug >= PF_DEBUG_MISC) {
5206 #endif
5207                                         printf("pf: OK ICMP %d:%d ",
5208                                             icmptype, pd->hdr.icmp->icmp_code);
5209                                         pf_print_host(pd->src, 0, pd->af);
5210                                         printf(" -> ");
5211                                         pf_print_host(pd->dst, 0, pd->af);
5212                                         printf(" state: ");
5213                                         pf_print_state(*state);
5214                                         printf(" seq=%u\n", seq);
5215                                 }
5216                         }
5217
5218                         /* translate source/destination address, if necessary */
5219                         if ((*state)->key[PF_SK_WIRE] !=
5220                             (*state)->key[PF_SK_STACK]) {
5221                                 struct pf_state_key *nk =
5222                                     (*state)->key[pd->didx];
5223
5224                                 if (PF_ANEQ(pd2.src,
5225                                     &nk->addr[pd2.sidx], pd2.af) ||
5226                                     nk->port[pd2.sidx] != th.th_sport)
5227                                         pf_change_icmp(pd2.src, &th.th_sport,
5228                                             daddr, &nk->addr[pd2.sidx],
5229                                             nk->port[pd2.sidx], NULL,
5230                                             pd2.ip_sum, icmpsum,
5231                                             pd->ip_sum, 0, pd2.af);
5232
5233                                 if (PF_ANEQ(pd2.dst,
5234                                     &nk->addr[pd2.didx], pd2.af) ||
5235                                     nk->port[pd2.didx] != th.th_dport)
5236                                         pf_change_icmp(pd2.dst, &th.th_dport,
5237                                             NULL, /* XXX Inbound NAT? */
5238                                             &nk->addr[pd2.didx],
5239                                             nk->port[pd2.didx], NULL,
5240                                             pd2.ip_sum, icmpsum,
5241                                             pd->ip_sum, 0, pd2.af);
5242                                 copyback = 1;
5243                         }
5244
5245                         if (copyback) {
5246                                 switch (pd2.af) {
5247 #ifdef INET
5248                                 case AF_INET:
5249                                         m_copyback(m, off, ICMP_MINLEN,
5250 #ifdef __FreeBSD__
5251                                             (caddr_t)
5252 #endif
5253                                             pd->hdr.icmp);
5254                                         m_copyback(m, ipoff2, sizeof(h2),
5255 #ifdef __FreeBSD__
5256                                             (caddr_t)
5257 #endif
5258                                             &h2);
5259                                         break;
5260 #endif /* INET */
5261 #ifdef INET6
5262                                 case AF_INET6:
5263                                         m_copyback(m, off,
5264                                             sizeof(struct icmp6_hdr),
5265 #ifdef __FreeBSD__
5266                                             (caddr_t)
5267 #endif
5268                                             pd->hdr.icmp6);
5269                                         m_copyback(m, ipoff2, sizeof(h2_6),
5270 #ifdef __FreeBSD__
5271                                             (caddr_t)
5272 #endif
5273                                             &h2_6);
5274                                         break;
5275 #endif /* INET6 */
5276                                 }
5277 #ifdef __FreeBSD__
5278                                 m_copyback(m, off2, 8, (caddr_t)&th);
5279 #else
5280                                 m_copyback(m, off2, 8, &th);
5281 #endif
5282                         }
5283
5284                         return (PF_PASS);
5285                         break;
5286                 }
5287                 case IPPROTO_UDP: {
5288                         struct udphdr           uh;
5289
5290                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
5291                             NULL, reason, pd2.af)) {
5292                                 DPFPRINTF(PF_DEBUG_MISC,
5293                                     ("pf: ICMP error message too short "
5294                                     "(udp)\n"));
5295                                 return (PF_DROP);
5296                         }
5297
5298                         key.af = pd2.af;
5299                         key.proto = IPPROTO_UDP;
5300                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5301                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5302                         key.port[pd2.sidx] = uh.uh_sport;
5303                         key.port[pd2.didx] = uh.uh_dport;
5304
5305 #ifdef __FreeBSD__
5306                         STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag);
5307 #else
5308                         STATE_LOOKUP(kif, &key, direction, *state, m);
5309 #endif
5310
5311                         /* translate source/destination address, if necessary */
5312                         if ((*state)->key[PF_SK_WIRE] !=
5313                             (*state)->key[PF_SK_STACK]) {
5314                                 struct pf_state_key *nk =
5315                                     (*state)->key[pd->didx];
5316
5317                                 if (PF_ANEQ(pd2.src,
5318                                     &nk->addr[pd2.sidx], pd2.af) ||
5319                                     nk->port[pd2.sidx] != uh.uh_sport)
5320                                         pf_change_icmp(pd2.src, &uh.uh_sport,
5321                                             daddr, &nk->addr[pd2.sidx],
5322                                             nk->port[pd2.sidx], &uh.uh_sum,
5323                                             pd2.ip_sum, icmpsum,
5324                                             pd->ip_sum, 1, pd2.af);
5325
5326                                 if (PF_ANEQ(pd2.dst,
5327                                     &nk->addr[pd2.didx], pd2.af) ||
5328                                     nk->port[pd2.didx] != uh.uh_dport)
5329                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
5330                                             NULL, /* XXX Inbound NAT? */
5331                                             &nk->addr[pd2.didx],
5332                                             nk->port[pd2.didx], &uh.uh_sum,
5333                                             pd2.ip_sum, icmpsum,
5334                                             pd->ip_sum, 1, pd2.af);
5335
5336                                 switch (pd2.af) {
5337 #ifdef INET
5338                                 case AF_INET:
5339                                         m_copyback(m, off, ICMP_MINLEN,
5340 #ifdef __FreeBSD__
5341                                             (caddr_t)
5342 #endif
5343                                             pd->hdr.icmp);
5344 #ifdef __FreeBSD__
5345                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5346 #else
5347                                         m_copyback(m, ipoff2, sizeof(h2), &h2);
5348 #endif
5349                                         break;
5350 #endif /* INET */
5351 #ifdef INET6
5352                                 case AF_INET6:
5353                                         m_copyback(m, off,
5354                                             sizeof(struct icmp6_hdr),
5355 #ifdef __FreeBSD__
5356                                             (caddr_t)
5357 #endif
5358                                             pd->hdr.icmp6);
5359                                         m_copyback(m, ipoff2, sizeof(h2_6),
5360 #ifdef __FreeBSD__
5361                                             (caddr_t)
5362 #endif
5363                                             &h2_6);
5364                                         break;
5365 #endif /* INET6 */
5366                                 }
5367 #ifdef __FreeBSD__
5368                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
5369 #else
5370                                 m_copyback(m, off2, sizeof(uh), &uh);
5371 #endif
5372                         }
5373                         return (PF_PASS);
5374                         break;
5375                 }
5376 #ifdef INET
5377                 case IPPROTO_ICMP: {
5378                         struct icmp             iih;
5379
5380                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
5381                             NULL, reason, pd2.af)) {
5382                                 DPFPRINTF(PF_DEBUG_MISC,
5383                                     ("pf: ICMP error message too short i"
5384                                     "(icmp)\n"));
5385                                 return (PF_DROP);
5386                         }
5387
5388                         key.af = pd2.af;
5389                         key.proto = IPPROTO_ICMP;
5390                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5391                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5392                         key.port[0] = key.port[1] = iih.icmp_id;
5393
5394 #ifdef __FreeBSD__
5395                         STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag);
5396 #else
5397                         STATE_LOOKUP(kif, &key, direction, *state, m);
5398 #endif
5399
5400                         /* translate source/destination address, if necessary */
5401                         if ((*state)->key[PF_SK_WIRE] !=
5402                             (*state)->key[PF_SK_STACK]) {
5403                                 struct pf_state_key *nk =
5404                                     (*state)->key[pd->didx];
5405
5406                                 if (PF_ANEQ(pd2.src,
5407                                     &nk->addr[pd2.sidx], pd2.af) ||
5408                                     nk->port[pd2.sidx] != iih.icmp_id)
5409                                         pf_change_icmp(pd2.src, &iih.icmp_id,
5410                                             daddr, &nk->addr[pd2.sidx],
5411                                             nk->port[pd2.sidx], NULL,
5412                                             pd2.ip_sum, icmpsum,
5413                                             pd->ip_sum, 0, AF_INET);
5414
5415                                 if (PF_ANEQ(pd2.dst,
5416                                     &nk->addr[pd2.didx], pd2.af) ||
5417                                     nk->port[pd2.didx] != iih.icmp_id)
5418                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
5419                                             NULL, /* XXX Inbound NAT? */
5420                                             &nk->addr[pd2.didx],
5421                                             nk->port[pd2.didx], NULL,
5422                                             pd2.ip_sum, icmpsum,
5423                                             pd->ip_sum, 0, AF_INET);
5424
5425 #ifdef __FreeBSD__
5426                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
5427                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5428                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
5429 #else
5430                                 m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp);
5431                                 m_copyback(m, ipoff2, sizeof(h2), &h2);
5432                                 m_copyback(m, off2, ICMP_MINLEN, &iih);
5433 #endif
5434                         }
5435                         return (PF_PASS);
5436                         break;
5437                 }
5438 #endif /* INET */
5439 #ifdef INET6
5440                 case IPPROTO_ICMPV6: {
5441                         struct icmp6_hdr        iih;
5442
5443                         if (!pf_pull_hdr(m, off2, &iih,
5444                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5445                                 DPFPRINTF(PF_DEBUG_MISC,
5446                                     ("pf: ICMP error message too short "
5447                                     "(icmp6)\n"));
5448                                 return (PF_DROP);
5449                         }
5450
5451                         key.af = pd2.af;
5452                         key.proto = IPPROTO_ICMPV6;
5453                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5454                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5455                         key.port[0] = key.port[1] = iih.icmp6_id;
5456
5457 #ifdef __FreeBSD__
5458                         STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag);
5459 #else
5460                         STATE_LOOKUP(kif, &key, direction, *state, m);
5461 #endif
5462
5463                         /* translate source/destination address, if necessary */
5464                         if ((*state)->key[PF_SK_WIRE] !=
5465                             (*state)->key[PF_SK_STACK]) {
5466                                 struct pf_state_key *nk =
5467                                     (*state)->key[pd->didx];
5468
5469                                 if (PF_ANEQ(pd2.src,
5470                                     &nk->addr[pd2.sidx], pd2.af) ||
5471                                     nk->port[pd2.sidx] != iih.icmp6_id)
5472                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
5473                                             daddr, &nk->addr[pd2.sidx],
5474                                             nk->port[pd2.sidx], NULL,
5475                                             pd2.ip_sum, icmpsum,
5476                                             pd->ip_sum, 0, AF_INET6);
5477
5478                                 if (PF_ANEQ(pd2.dst,
5479                                     &nk->addr[pd2.didx], pd2.af) ||
5480                                     nk->port[pd2.didx] != iih.icmp6_id)
5481                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
5482                                             NULL, /* XXX Inbound NAT? */
5483                                             &nk->addr[pd2.didx],
5484                                             nk->port[pd2.didx], NULL,
5485                                             pd2.ip_sum, icmpsum,
5486                                             pd->ip_sum, 0, AF_INET6);
5487
5488 #ifdef __FreeBSD__
5489                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
5490                                     (caddr_t)pd->hdr.icmp6);
5491                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5492                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5493                                     (caddr_t)&iih);
5494 #else
5495                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
5496                                     pd->hdr.icmp6);
5497                                 m_copyback(m, ipoff2, sizeof(h2_6), &h2_6);
5498                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5499                                     &iih);
5500 #endif
5501                         }
5502                         return (PF_PASS);
5503                         break;
5504                 }
5505 #endif /* INET6 */
5506                 default: {
5507                         key.af = pd2.af;
5508                         key.proto = pd2.proto;
5509                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5510                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5511                         key.port[0] = key.port[1] = 0;
5512
5513 #ifdef __FreeBSD__
5514                         STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag);
5515 #else
5516                         STATE_LOOKUP(kif, &key, direction, *state, m);
5517 #endif
5518
5519                         /* translate source/destination address, if necessary */
5520                         if ((*state)->key[PF_SK_WIRE] !=
5521                             (*state)->key[PF_SK_STACK]) {
5522                                 struct pf_state_key *nk =
5523                                     (*state)->key[pd->didx];
5524
5525                                 if (PF_ANEQ(pd2.src,
5526                                     &nk->addr[pd2.sidx], pd2.af))
5527                                         pf_change_icmp(pd2.src, NULL, daddr,
5528                                             &nk->addr[pd2.sidx], 0, NULL,
5529                                             pd2.ip_sum, icmpsum,
5530                                             pd->ip_sum, 0, pd2.af);
5531
5532                                 if (PF_ANEQ(pd2.dst,
5533                                     &nk->addr[pd2.didx], pd2.af))
5534                                         pf_change_icmp(pd2.src, NULL,
5535                                             NULL, /* XXX Inbound NAT? */
5536                                             &nk->addr[pd2.didx], 0, NULL,
5537                                             pd2.ip_sum, icmpsum,
5538                                             pd->ip_sum, 0, pd2.af);
5539
5540                                 switch (pd2.af) {
5541 #ifdef INET
5542                                 case AF_INET:
5543 #ifdef __FreeBSD__
5544                                         m_copyback(m, off, ICMP_MINLEN,
5545                                             (caddr_t)pd->hdr.icmp);
5546                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5547 #else
5548                                         m_copyback(m, off, ICMP_MINLEN,
5549                                             pd->hdr.icmp);
5550                                         m_copyback(m, ipoff2, sizeof(h2), &h2);
5551 #endif
5552                                         break;
5553 #endif /* INET */
5554 #ifdef INET6
5555                                 case AF_INET6:
5556                                         m_copyback(m, off,
5557                                             sizeof(struct icmp6_hdr),
5558 #ifdef __FreeBSD__
5559                                             (caddr_t)
5560 #endif
5561                                             pd->hdr.icmp6);
5562                                         m_copyback(m, ipoff2, sizeof(h2_6),
5563 #ifdef __FreeBSD__
5564                                             (caddr_t)
5565 #endif
5566                                             &h2_6);
5567                                         break;
5568 #endif /* INET6 */
5569                                 }
5570                         }
5571                         return (PF_PASS);
5572                         break;
5573                 }
5574                 }
5575         }
5576 }
5577
5578 int
5579 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5580     struct mbuf *m, struct pf_pdesc *pd)
5581 {
5582         struct pf_state_peer    *src, *dst;
5583         struct pf_state_key_cmp  key;
5584
5585         key.af = pd->af;
5586         key.proto = pd->proto;
5587         if (direction == PF_IN) {
5588                 PF_ACPY(&key.addr[0], pd->src, key.af);
5589                 PF_ACPY(&key.addr[1], pd->dst, key.af);
5590                 key.port[0] = key.port[1] = 0;
5591         } else {
5592                 PF_ACPY(&key.addr[1], pd->src, key.af);
5593                 PF_ACPY(&key.addr[0], pd->dst, key.af);
5594                 key.port[1] = key.port[0] = 0;
5595         }
5596
5597 #ifdef __FreeBSD__
5598         STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag);
5599 #else
5600         STATE_LOOKUP(kif, &key, direction, *state, m);
5601 #endif
5602
5603         if (direction == (*state)->direction) {
5604                 src = &(*state)->src;
5605                 dst = &(*state)->dst;
5606         } else {
5607                 src = &(*state)->dst;
5608                 dst = &(*state)->src;
5609         }
5610
5611         /* update states */
5612         if (src->state < PFOTHERS_SINGLE)
5613                 src->state = PFOTHERS_SINGLE;
5614         if (dst->state == PFOTHERS_SINGLE)
5615                 dst->state = PFOTHERS_MULTIPLE;
5616
5617         /* update expire time */
5618         (*state)->expire = time_second;
5619         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5620                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5621         else
5622                 (*state)->timeout = PFTM_OTHER_SINGLE;
5623
5624         /* translate source/destination address, if necessary */
5625         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5626                 struct pf_state_key *nk = (*state)->key[pd->didx];
5627
5628 #ifdef __FreeBSD__
5629                 KASSERT(nk, ("%s: nk is null", __FUNCTION__));
5630                 KASSERT(pd, ("%s: pd is null", __FUNCTION__));
5631                 KASSERT(pd->src, ("%s: pd->src is null", __FUNCTION__));
5632                 KASSERT(pd->dst, ("%s: pd->dst is null", __FUNCTION__));
5633 #else
5634                 KASSERT(nk);
5635                 KASSERT(pd);
5636                 KASSERT(pd->src);
5637                 KASSERT(pd->dst);
5638 #endif
5639                 switch (pd->af) {
5640 #ifdef INET
5641                 case AF_INET:
5642                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5643                                 pf_change_a(&pd->src->v4.s_addr,
5644                                     pd->ip_sum,
5645                                     nk->addr[pd->sidx].v4.s_addr,
5646                                     0);
5647
5648
5649                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5650                                 pf_change_a(&pd->dst->v4.s_addr,
5651                                     pd->ip_sum,
5652                                     nk->addr[pd->didx].v4.s_addr,
5653                                     0);
5654
5655                                 break;
5656 #endif /* INET */
5657 #ifdef INET6
5658                 case AF_INET6:
5659                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5660                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5661
5662                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5663                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5664 #endif /* INET6 */
5665                 }
5666         }
5667         return (PF_PASS);
5668 }
5669
5670 /*
5671  * ipoff and off are measured from the start of the mbuf chain.
5672  * h must be at "ipoff" on the mbuf chain.
5673  */
5674 void *
5675 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5676     u_short *actionp, u_short *reasonp, sa_family_t af)
5677 {
5678         switch (af) {
5679 #ifdef INET
5680         case AF_INET: {
5681                 struct ip       *h = mtod(m, struct ip *);
5682                 u_int16_t        fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
5683
5684                 if (fragoff) {
5685                         if (fragoff >= len)
5686                                 ACTION_SET(actionp, PF_PASS);
5687                         else {
5688                                 ACTION_SET(actionp, PF_DROP);
5689                                 REASON_SET(reasonp, PFRES_FRAG);
5690                         }
5691                         return (NULL);
5692                 }
5693                 if (m->m_pkthdr.len < off + len ||
5694                     ntohs(h->ip_len) < off + len) {
5695                         ACTION_SET(actionp, PF_DROP);
5696                         REASON_SET(reasonp, PFRES_SHORT);
5697                         return (NULL);
5698                 }
5699                 break;
5700         }
5701 #endif /* INET */
5702 #ifdef INET6
5703         case AF_INET6: {
5704                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
5705
5706                 if (m->m_pkthdr.len < off + len ||
5707                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5708                     (unsigned)(off + len)) {
5709                         ACTION_SET(actionp, PF_DROP);
5710                         REASON_SET(reasonp, PFRES_SHORT);
5711                         return (NULL);
5712                 }
5713                 break;
5714         }
5715 #endif /* INET6 */
5716         }
5717         m_copydata(m, off, len, p);
5718         return (p);
5719 }
5720
5721 int
5722 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5723     int rtableid)
5724 {
5725 #ifdef __FreeBSD__
5726 #ifdef RADIX_MPATH
5727         struct radix_node_head  *rnh;
5728 #endif
5729 #endif
5730         struct sockaddr_in      *dst;
5731         int                      ret = 1;
5732         int                      check_mpath;
5733 #ifndef __FreeBSD__
5734         extern int               ipmultipath;
5735 #endif
5736 #ifdef INET6
5737 #ifndef __FreeBSD__
5738         extern int               ip6_multipath;
5739 #endif
5740         struct sockaddr_in6     *dst6;
5741         struct route_in6         ro;
5742 #else
5743         struct route             ro;
5744 #endif
5745         struct radix_node       *rn;
5746         struct rtentry          *rt;
5747         struct ifnet            *ifp;
5748
5749         check_mpath = 0;
5750 #ifdef __FreeBSD__
5751 #ifdef RADIX_MPATH
5752         /* XXX: stick to table 0 for now */
5753         rnh = rt_tables_get_rnh(0, af);
5754         if (rnh != NULL && rn_mpath_capable(rnh))
5755                 check_mpath = 1;
5756 #endif
5757 #endif
5758         bzero(&ro, sizeof(ro));
5759         switch (af) {
5760         case AF_INET:
5761                 dst = satosin(&ro.ro_dst);
5762                 dst->sin_family = AF_INET;
5763                 dst->sin_len = sizeof(*dst);
5764                 dst->sin_addr = addr->v4;
5765 #ifndef __FreeBSD__
5766                 if (ipmultipath)
5767                         check_mpath = 1;
5768 #endif
5769                 break;
5770 #ifdef INET6
5771         case AF_INET6:
5772                 /*
5773                  * Skip check for addresses with embedded interface scope,
5774                  * as they would always match anyway.
5775                  */
5776                 if (IN6_IS_SCOPE_EMBED(&addr->v6))
5777                         goto out;
5778                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5779                 dst6->sin6_family = AF_INET6;
5780                 dst6->sin6_len = sizeof(*dst6);
5781                 dst6->sin6_addr = addr->v6;
5782 #ifndef __FreeBSD__
5783                 if (ip6_multipath)
5784                         check_mpath = 1;
5785 #endif
5786                 break;
5787 #endif /* INET6 */
5788         default:
5789                 return (0);
5790         }
5791
5792         /* Skip checks for ipsec interfaces */
5793         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5794                 goto out;
5795
5796 #ifdef __FreeBSD__
5797         switch (af) {
5798 #ifdef INET6
5799         case AF_INET6:
5800                 in6_rtalloc_ign(&ro, 0, rtableid);
5801                 break;
5802 #endif
5803 #ifdef INET
5804         case AF_INET:
5805                 in_rtalloc_ign((struct route *)&ro, 0, rtableid);
5806                 break;
5807 #endif
5808         default:
5809                 rtalloc_ign((struct route *)&ro, 0);    /* No/default FIB. */
5810                 break;
5811         }
5812 #else /* ! __FreeBSD__ */
5813         rtalloc_noclone((struct route *)&ro, NO_CLONING);
5814 #endif
5815
5816         if (ro.ro_rt != NULL) {
5817                 /* No interface given, this is a no-route check */
5818                 if (kif == NULL)
5819                         goto out;
5820
5821                 if (kif->pfik_ifp == NULL) {
5822                         ret = 0;
5823                         goto out;
5824                 }
5825
5826                 /* Perform uRPF check if passed input interface */
5827                 ret = 0;
5828                 rn = (struct radix_node *)ro.ro_rt;
5829                 do {
5830                         rt = (struct rtentry *)rn;
5831 #ifndef __FreeBSD__ /* CARPDEV */
5832                         if (rt->rt_ifp->if_type == IFT_CARP)
5833                                 ifp = rt->rt_ifp->if_carpdev;
5834                         else
5835 #endif
5836                                 ifp = rt->rt_ifp;
5837
5838                         if (kif->pfik_ifp == ifp)
5839                                 ret = 1;
5840 #ifdef __FreeBSD__
5841 #ifdef RADIX_MPATH
5842                         rn = rn_mpath_next(rn);
5843 #endif
5844 #else
5845                         rn = rn_mpath_next(rn, 0);
5846 #endif
5847                 } while (check_mpath == 1 && rn != NULL && ret == 0);
5848         } else
5849                 ret = 0;
5850 out:
5851         if (ro.ro_rt != NULL)
5852                 RTFREE(ro.ro_rt);
5853         return (ret);
5854 }
5855
5856 int
5857 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw,
5858     int rtableid)
5859 {
5860         struct sockaddr_in      *dst;
5861 #ifdef INET6
5862         struct sockaddr_in6     *dst6;
5863         struct route_in6         ro;
5864 #else
5865         struct route             ro;
5866 #endif
5867         int                      ret = 0;
5868
5869         bzero(&ro, sizeof(ro));
5870         switch (af) {
5871         case AF_INET:
5872                 dst = satosin(&ro.ro_dst);
5873                 dst->sin_family = AF_INET;
5874                 dst->sin_len = sizeof(*dst);
5875                 dst->sin_addr = addr->v4;
5876                 break;
5877 #ifdef INET6
5878         case AF_INET6:
5879                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5880                 dst6->sin6_family = AF_INET6;
5881                 dst6->sin6_len = sizeof(*dst6);
5882                 dst6->sin6_addr = addr->v6;
5883                 break;
5884 #endif /* INET6 */
5885         default:
5886                 return (0);
5887         }
5888
5889 #ifdef __FreeBSD__
5890         switch (af) {
5891 #ifdef INET6
5892         case AF_INET6:
5893                 in6_rtalloc_ign(&ro, 0, rtableid);
5894                 break;
5895 #endif
5896 #ifdef INET
5897         case AF_INET:
5898                 in_rtalloc_ign((struct route *)&ro, 0, rtableid);
5899                 break;
5900 #endif
5901         default:
5902                 rtalloc_ign((struct route *)&ro, 0);
5903                 break;
5904         }
5905 #else /* ! __FreeBSD__ */
5906         rtalloc_noclone((struct route *)&ro, NO_CLONING);
5907 #endif
5908
5909         if (ro.ro_rt != NULL) {
5910 #ifdef __FreeBSD__
5911                 /* XXX_IMPORT: later */
5912 #else
5913                 if (ro.ro_rt->rt_labelid == aw->v.rtlabel)
5914                         ret = 1;
5915 #endif
5916                 RTFREE(ro.ro_rt);
5917         }
5918
5919         return (ret);
5920 }
5921
5922 #ifdef INET
5923 void
5924 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5925     struct pf_state *s, struct pf_pdesc *pd)
5926 {
5927         struct mbuf             *m0, *m1;
5928         struct route             iproute;
5929         struct route            *ro = NULL;
5930         struct sockaddr_in      *dst;
5931         struct ip               *ip;
5932         struct ifnet            *ifp = NULL;
5933         struct pf_addr           naddr;
5934         struct pf_src_node      *sn = NULL;
5935         int                      error = 0;
5936 #ifdef __FreeBSD__
5937         int sw_csum;
5938 #endif
5939 #ifdef IPSEC
5940         struct m_tag            *mtag;
5941 #endif /* IPSEC */
5942
5943         if (m == NULL || *m == NULL || r == NULL ||
5944             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5945                 panic("pf_route: invalid parameters");
5946
5947 #ifdef __FreeBSD__
5948         if (pd->pf_mtag->routed++ > 3) {
5949 #else
5950         if ((*m)->m_pkthdr.pf.routed++ > 3) {
5951 #endif
5952                 m0 = *m;
5953                 *m = NULL;
5954                 goto bad;
5955         }
5956
5957         if (r->rt == PF_DUPTO) {
5958 #ifdef __FreeBSD__
5959                 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL)
5960 #else
5961                 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
5962 #endif
5963                         return;
5964         } else {
5965                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5966                         return;
5967                 m0 = *m;
5968         }
5969
5970         if (m0->m_len < sizeof(struct ip)) {
5971                 DPFPRINTF(PF_DEBUG_URGENT,
5972                     ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5973                 goto bad;
5974         }
5975
5976         ip = mtod(m0, struct ip *);
5977
5978         ro = &iproute;
5979         bzero((caddr_t)ro, sizeof(*ro));
5980         dst = satosin(&ro->ro_dst);
5981         dst->sin_family = AF_INET;
5982         dst->sin_len = sizeof(*dst);
5983         dst->sin_addr = ip->ip_dst;
5984
5985         if (r->rt == PF_FASTROUTE) {
5986 #ifdef __FreeBSD__
5987                 in_rtalloc_ign(ro, 0, M_GETFIB(m0));
5988 #else
5989                 rtalloc(ro);
5990 #endif
5991                 if (ro->ro_rt == 0) {
5992 #ifdef __FreeBSD__
5993                         KMOD_IPSTAT_INC(ips_noroute);
5994 #else
5995                         ipstat.ips_noroute++;
5996 #endif
5997                         goto bad;
5998                 }
5999
6000                 ifp = ro->ro_rt->rt_ifp;
6001                 ro->ro_rt->rt_use++;
6002
6003                 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
6004                         dst = satosin(ro->ro_rt->rt_gateway);
6005         } else {
6006                 if (TAILQ_EMPTY(&r->rpool.list)) {
6007                         DPFPRINTF(PF_DEBUG_URGENT,
6008                             ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
6009                         goto bad;
6010                 }
6011                 if (s == NULL) {
6012                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
6013                             &naddr, NULL, &sn);
6014                         if (!PF_AZERO(&naddr, AF_INET))
6015                                 dst->sin_addr.s_addr = naddr.v4.s_addr;
6016                         ifp = r->rpool.cur->kif ?
6017                             r->rpool.cur->kif->pfik_ifp : NULL;
6018                 } else {
6019                         if (!PF_AZERO(&s->rt_addr, AF_INET))
6020                                 dst->sin_addr.s_addr =
6021                                     s->rt_addr.v4.s_addr;
6022                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
6023                 }
6024         }
6025         if (ifp == NULL)
6026                 goto bad;
6027
6028         if (oifp != ifp) {
6029 #ifdef __FreeBSD__
6030                 PF_UNLOCK();
6031                 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
6032                         PF_LOCK();
6033                         goto bad;
6034                 } else if (m0 == NULL) {
6035                         PF_LOCK();
6036                         goto done;
6037                 }
6038                 PF_LOCK();
6039 #else
6040                 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS)
6041                         goto bad;
6042                 else if (m0 == NULL)
6043                         goto done;
6044 #endif
6045                 if (m0->m_len < sizeof(struct ip)) {
6046                         DPFPRINTF(PF_DEBUG_URGENT,
6047                             ("pf_route: m0->m_len < sizeof(struct ip)\n"));
6048                         goto bad;
6049                 }
6050                 ip = mtod(m0, struct ip *);
6051         }
6052
6053 #ifdef __FreeBSD__
6054         /* Copied from FreeBSD 5.1-CURRENT ip_output. */
6055         m0->m_pkthdr.csum_flags |= CSUM_IP;
6056         sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
6057         if (sw_csum & CSUM_DELAY_DATA) {
6058                 /*
6059                  * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least)
6060                  */
6061                 NTOHS(ip->ip_len);
6062                 NTOHS(ip->ip_off);      /* XXX: needed? */
6063                 in_delayed_cksum(m0);
6064                 HTONS(ip->ip_len);
6065                 HTONS(ip->ip_off);
6066                 sw_csum &= ~CSUM_DELAY_DATA;
6067         }
6068         m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
6069
6070         if (ntohs(ip->ip_len) <= ifp->if_mtu ||
6071             (ifp->if_hwassist & CSUM_FRAGMENT &&
6072             ((ip->ip_off & htons(IP_DF)) == 0))) {
6073                 /*
6074                  * ip->ip_len = htons(ip->ip_len);
6075                  * ip->ip_off = htons(ip->ip_off);
6076                  */
6077                 ip->ip_sum = 0;
6078                 if (sw_csum & CSUM_DELAY_IP) {
6079                         /* From KAME */
6080                         if (ip->ip_v == IPVERSION &&
6081                             (ip->ip_hl << 2) == sizeof(*ip)) {
6082                                 ip->ip_sum = in_cksum_hdr(ip);
6083                         } else {
6084                                 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
6085                         }
6086                 }
6087                 PF_UNLOCK();
6088                 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro);
6089                 PF_LOCK();
6090                 goto done;
6091         }
6092 #else
6093         /* Copied from ip_output. */
6094 #ifdef IPSEC
6095         /*
6096          * If deferred crypto processing is needed, check that the
6097          * interface supports it.
6098          */
6099         if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL))
6100             != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) {
6101                 /* Notify IPsec to do its own crypto. */
6102                 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1));
6103                 goto bad;
6104         }
6105 #endif /* IPSEC */
6106
6107         /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */
6108         if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) {
6109                 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) ||
6110                     ifp->if_bridge != NULL) {
6111                         in_delayed_cksum(m0);
6112                         m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clr */
6113                 }
6114         } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) {
6115                 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) ||
6116                     ifp->if_bridge != NULL) {
6117                         in_delayed_cksum(m0);
6118                         m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clr */
6119                 }
6120         }
6121
6122         if (ntohs(ip->ip_len) <= ifp->if_mtu) {
6123                 ip->ip_sum = 0;
6124                 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) &&
6125                     ifp->if_bridge == NULL) {
6126                         m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT;
6127 #ifdef __FreeBSD__
6128                         KMOD_IPSTAT_INC(ips_outhwcsum);
6129 #else
6130                         ipstat.ips_outhwcsum++;
6131 #endif
6132                 } else
6133                         ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
6134                 /* Update relevant hardware checksum stats for TCP/UDP */
6135                 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT)
6136                         KMOD_TCPSTAT_INC(tcps_outhwcsum);
6137                 else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT)
6138                         KMOD_UDPSTAT_INC(udps_outhwcsum);
6139                 error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL);
6140                 goto done;
6141         }
6142 #endif
6143
6144         /*
6145          * Too large for interface; fragment if possible.
6146          * Must be able to put at least 8 bytes per fragment.
6147          */
6148         if (ip->ip_off & htons(IP_DF)) {
6149 #ifdef __FreeBSD__
6150                 KMOD_IPSTAT_INC(ips_cantfrag);
6151 #else
6152                 ipstat.ips_cantfrag++;
6153 #endif
6154                 if (r->rt != PF_DUPTO) {
6155 #ifdef __FreeBSD__
6156                         /* icmp_error() expects host byte ordering */
6157                         NTOHS(ip->ip_len);
6158                         NTOHS(ip->ip_off);
6159                         PF_UNLOCK();
6160                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
6161                             ifp->if_mtu);
6162                         PF_LOCK();
6163 #else
6164                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
6165                             ifp->if_mtu);
6166 #endif
6167                         goto done;
6168                 } else
6169                         goto bad;
6170         }
6171
6172         m1 = m0;
6173 #ifdef __FreeBSD__
6174         /*
6175          * XXX: is cheaper + less error prone than own function
6176          */
6177         NTOHS(ip->ip_len);
6178         NTOHS(ip->ip_off);
6179         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
6180 #else
6181         error = ip_fragment(m0, ifp, ifp->if_mtu);
6182 #endif
6183         if (error) {
6184 #ifndef __FreeBSD__    /* ip_fragment does not do m_freem() on FreeBSD */
6185                 m0 = NULL;
6186 #endif
6187                 goto bad;
6188         }
6189
6190         for (m0 = m1; m0; m0 = m1) {
6191                 m1 = m0->m_nextpkt;
6192                 m0->m_nextpkt = 0;
6193 #ifdef __FreeBSD__
6194                 if (error == 0) {
6195                         PF_UNLOCK();
6196                         error = (*ifp->if_output)(ifp, m0, sintosa(dst),
6197                             NULL);
6198                         PF_LOCK();
6199                 } else
6200 #else
6201                 if (error == 0)
6202                         error = (*ifp->if_output)(ifp, m0, sintosa(dst),
6203                             NULL);
6204                 else
6205 #endif
6206                         m_freem(m0);
6207         }
6208
6209         if (error == 0)
6210 #ifdef __FreeBSD__
6211                 KMOD_IPSTAT_INC(ips_fragmented);
6212 #else
6213                 ipstat.ips_fragmented++;
6214 #endif
6215
6216 done:
6217         if (r->rt != PF_DUPTO)
6218                 *m = NULL;
6219         if (ro == &iproute && ro->ro_rt)
6220                 RTFREE(ro->ro_rt);
6221         return;
6222
6223 bad:
6224         m_freem(m0);
6225         goto done;
6226 }
6227 #endif /* INET */
6228
6229 #ifdef INET6
6230 void
6231 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
6232     struct pf_state *s, struct pf_pdesc *pd)
6233 {
6234         struct mbuf             *m0;
6235         struct route_in6         ip6route;
6236         struct route_in6        *ro;
6237         struct sockaddr_in6     *dst;
6238         struct ip6_hdr          *ip6;
6239         struct ifnet            *ifp = NULL;
6240         struct pf_addr           naddr;
6241         struct pf_src_node      *sn = NULL;
6242
6243         if (m == NULL || *m == NULL || r == NULL ||
6244             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
6245                 panic("pf_route6: invalid parameters");
6246
6247 #ifdef __FreeBSD__
6248         if (pd->pf_mtag->routed++ > 3) {
6249 #else
6250         if ((*m)->m_pkthdr.pf.routed++ > 3) {
6251 #endif
6252                 m0 = *m;
6253                 *m = NULL;
6254                 goto bad;
6255         }
6256
6257         if (r->rt == PF_DUPTO) {
6258 #ifdef __FreeBSD__
6259                 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL)
6260 #else
6261                 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
6262 #endif
6263                         return;
6264         } else {
6265                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
6266                         return;
6267                 m0 = *m;
6268         }
6269
6270         if (m0->m_len < sizeof(struct ip6_hdr)) {
6271                 DPFPRINTF(PF_DEBUG_URGENT,
6272                     ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
6273                 goto bad;
6274         }
6275         ip6 = mtod(m0, struct ip6_hdr *);
6276
6277         ro = &ip6route;
6278         bzero((caddr_t)ro, sizeof(*ro));
6279         dst = (struct sockaddr_in6 *)&ro->ro_dst;
6280         dst->sin6_family = AF_INET6;
6281         dst->sin6_len = sizeof(*dst);
6282         dst->sin6_addr = ip6->ip6_dst;
6283
6284         /* Cheat. XXX why only in the v6 case??? */
6285         if (r->rt == PF_FASTROUTE) {
6286 #ifdef __FreeBSD__
6287                 m0->m_flags |= M_SKIP_FIREWALL;
6288                 PF_UNLOCK();
6289                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
6290 #else
6291                 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED;
6292                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
6293 #endif
6294                 return;
6295         }
6296
6297         if (TAILQ_EMPTY(&r->rpool.list)) {
6298                 DPFPRINTF(PF_DEBUG_URGENT,
6299                     ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
6300                 goto bad;
6301         }
6302         if (s == NULL) {
6303                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
6304                     &naddr, NULL, &sn);
6305                 if (!PF_AZERO(&naddr, AF_INET6))
6306                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
6307                             &naddr, AF_INET6);
6308                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
6309         } else {
6310                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
6311                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
6312                             &s->rt_addr, AF_INET6);
6313                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
6314         }
6315         if (ifp == NULL)
6316                 goto bad;
6317
6318         if (oifp != ifp) {
6319 #ifdef __FreeBSD__
6320                 PF_UNLOCK();
6321                 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
6322                         PF_LOCK();
6323                         goto bad;
6324                 } else if (m0 == NULL) {
6325                         PF_LOCK();
6326                         goto done;
6327                 }
6328                 PF_LOCK();
6329 #else
6330                 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS)
6331                         goto bad;
6332                 else if (m0 == NULL)
6333                         goto done;
6334 #endif
6335                 if (m0->m_len < sizeof(struct ip6_hdr)) {
6336                         DPFPRINTF(PF_DEBUG_URGENT,
6337                             ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
6338                         goto bad;
6339                 }
6340                 ip6 = mtod(m0, struct ip6_hdr *);
6341         }
6342
6343         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 &
6344             ~ifp->if_hwassist) {
6345                 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6);
6346                 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr));
6347                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
6348         }
6349
6350         /*
6351          * If the packet is too large for the outgoing interface,
6352          * send back an icmp6 error.
6353          */
6354         if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr))
6355                 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
6356         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
6357 #ifdef __FreeBSD__
6358                 PF_UNLOCK();
6359 #endif
6360                 nd6_output(ifp, ifp, m0, dst, NULL);
6361 #ifdef __FreeBSD__
6362                 PF_LOCK();
6363 #endif
6364         } else {
6365                 in6_ifstat_inc(ifp, ifs6_in_toobig);
6366 #ifdef __FreeBSD__
6367                 if (r->rt != PF_DUPTO) {
6368                         PF_UNLOCK();
6369                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
6370                         PF_LOCK();
6371                 } else
6372 #else
6373                 if (r->rt != PF_DUPTO)
6374                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
6375                 else
6376 #endif
6377                         goto bad;
6378         }
6379
6380 done:
6381         if (r->rt != PF_DUPTO)
6382                 *m = NULL;
6383         return;
6384
6385 bad:
6386         m_freem(m0);
6387         goto done;
6388 }
6389 #endif /* INET6 */
6390
6391 #ifdef __FreeBSD__
6392 /*
6393  * FreeBSD supports cksum offloads for the following drivers.
6394  *  em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4),
6395  *   ti(4), txp(4), xl(4)
6396  *
6397  * CSUM_DATA_VALID | CSUM_PSEUDO_HDR :
6398  *  network driver performed cksum including pseudo header, need to verify
6399  *   csum_data
6400  * CSUM_DATA_VALID :
6401  *  network driver performed cksum, needs to additional pseudo header
6402  *  cksum computation with partial csum_data(i.e. lack of H/W support for
6403  *  pseudo header, for instance hme(4), sk(4) and possibly gem(4))
6404  *
6405  * After validating the cksum of packet, set both flag CSUM_DATA_VALID and
6406  * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper
6407  * TCP/UDP layer.
6408  * Also, set csum_data to 0xffff to force cksum validation.
6409  */
6410 int
6411 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
6412 {
6413         u_int16_t sum = 0;
6414         int hw_assist = 0;
6415         struct ip *ip;
6416
6417         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
6418                 return (1);
6419         if (m->m_pkthdr.len < off + len)
6420                 return (1);
6421
6422         switch (p) {
6423         case IPPROTO_TCP:
6424                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
6425                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
6426                                 sum = m->m_pkthdr.csum_data;
6427                         } else {
6428                                 ip = mtod(m, struct ip *);
6429                                 sum = in_pseudo(ip->ip_src.s_addr,
6430                                 ip->ip_dst.s_addr, htonl((u_short)len +
6431                                 m->m_pkthdr.csum_data + IPPROTO_TCP));
6432                         }
6433                         sum ^= 0xffff;
6434                         ++hw_assist;
6435                 }
6436                 break;
6437         case IPPROTO_UDP:
6438                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
6439                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
6440                                 sum = m->m_pkthdr.csum_data;
6441                         } else {
6442                                 ip = mtod(m, struct ip *);
6443                                 sum = in_pseudo(ip->ip_src.s_addr,
6444                                 ip->ip_dst.s_addr, htonl((u_short)len +
6445                                 m->m_pkthdr.csum_data + IPPROTO_UDP));
6446                         }
6447                         sum ^= 0xffff;
6448                         ++hw_assist;
6449                 }
6450                 break;
6451         case IPPROTO_ICMP:
6452 #ifdef INET6
6453         case IPPROTO_ICMPV6:
6454 #endif /* INET6 */
6455                 break;
6456         default:
6457                 return (1);
6458         }
6459
6460         if (!hw_assist) {
6461                 switch (af) {
6462                 case AF_INET:
6463                         if (p == IPPROTO_ICMP) {
6464                                 if (m->m_len < off)
6465                                         return (1);
6466                                 m->m_data += off;
6467                                 m->m_len -= off;
6468                                 sum = in_cksum(m, len);
6469                                 m->m_data -= off;
6470                                 m->m_len += off;
6471                         } else {
6472                                 if (m->m_len < sizeof(struct ip))
6473                                         return (1);
6474                                 sum = in4_cksum(m, p, off, len);
6475                         }
6476                         break;
6477 #ifdef INET6
6478                 case AF_INET6:
6479                         if (m->m_len < sizeof(struct ip6_hdr))
6480                                 return (1);
6481                         sum = in6_cksum(m, p, off, len);
6482                         break;
6483 #endif /* INET6 */
6484                 default:
6485                         return (1);
6486                 }
6487         }
6488         if (sum) {
6489                 switch (p) {
6490                 case IPPROTO_TCP:
6491                     {
6492                         KMOD_TCPSTAT_INC(tcps_rcvbadsum);
6493                         break;
6494                     }
6495                 case IPPROTO_UDP:
6496                     {
6497                         KMOD_UDPSTAT_INC(udps_badsum);
6498                         break;
6499                     }
6500 #ifdef INET
6501                 case IPPROTO_ICMP:
6502                     {
6503                         KMOD_ICMPSTAT_INC(icps_checksum);
6504                         break;
6505                     }
6506 #endif
6507 #ifdef INET6
6508                 case IPPROTO_ICMPV6:
6509                     {
6510                         KMOD_ICMP6STAT_INC(icp6s_checksum);
6511                         break;
6512                     }
6513 #endif /* INET6 */
6514                 }
6515                 return (1);
6516         } else {
6517                 if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
6518                         m->m_pkthdr.csum_flags |=
6519                             (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
6520                         m->m_pkthdr.csum_data = 0xffff;
6521                 }
6522         }
6523         return (0);
6524 }
6525 #else /* !__FreeBSD__ */
6526
6527 /*
6528  * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
6529  *   off is the offset where the protocol header starts
6530  *   len is the total length of protocol header plus payload
6531  * returns 0 when the checksum is valid, otherwise returns 1.
6532  */
6533 int
6534 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
6535     sa_family_t af)
6536 {
6537         u_int16_t flag_ok, flag_bad;
6538         u_int16_t sum;
6539
6540         switch (p) {
6541         case IPPROTO_TCP:
6542                 flag_ok = M_TCP_CSUM_IN_OK;
6543                 flag_bad = M_TCP_CSUM_IN_BAD;
6544                 break;
6545         case IPPROTO_UDP:
6546                 flag_ok = M_UDP_CSUM_IN_OK;
6547                 flag_bad = M_UDP_CSUM_IN_BAD;
6548                 break;
6549         case IPPROTO_ICMP:
6550 #ifdef INET6
6551         case IPPROTO_ICMPV6:
6552 #endif /* INET6 */
6553                 flag_ok = flag_bad = 0;
6554                 break;
6555         default:
6556                 return (1);
6557         }
6558         if (m->m_pkthdr.csum_flags & flag_ok)
6559                 return (0);
6560         if (m->m_pkthdr.csum_flags & flag_bad)
6561                 return (1);
6562         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
6563                 return (1);
6564         if (m->m_pkthdr.len < off + len)
6565                 return (1);
6566         switch (af) {
6567 #ifdef INET
6568         case AF_INET:
6569                 if (p == IPPROTO_ICMP) {
6570                         if (m->m_len < off)
6571                                 return (1);
6572                         m->m_data += off;
6573                         m->m_len -= off;
6574                         sum = in_cksum(m, len);
6575                         m->m_data -= off;
6576                         m->m_len += off;
6577                 } else {
6578                         if (m->m_len < sizeof(struct ip))
6579                                 return (1);
6580                         sum = in4_cksum(m, p, off, len);
6581                 }
6582                 break;
6583 #endif /* INET */
6584 #ifdef INET6
6585         case AF_INET6:
6586                 if (m->m_len < sizeof(struct ip6_hdr))
6587                         return (1);
6588                 sum = in6_cksum(m, p, off, len);
6589                 break;
6590 #endif /* INET6 */
6591         default:
6592                 return (1);
6593         }
6594         if (sum) {
6595                 m->m_pkthdr.csum_flags |= flag_bad;
6596                 switch (p) {
6597                 case IPPROTO_TCP:
6598                         KMOD_TCPSTAT_INC(tcps_rcvbadsum);
6599                         break;
6600                 case IPPROTO_UDP:
6601                         KMOD_UDPSTAT_INC(udps_badsum);
6602                         break;
6603 #ifdef INET
6604                 case IPPROTO_ICMP:
6605                         KMOD_ICMPSTAT_INC(icps_checksum);
6606                         break;
6607 #endif
6608 #ifdef INET6
6609                 case IPPROTO_ICMPV6:
6610                         KMOD_ICMP6STAT_INC(icp6s_checksum);
6611                         break;
6612 #endif /* INET6 */
6613                 }
6614                 return (1);
6615         }
6616         m->m_pkthdr.csum_flags |= flag_ok;
6617         return (0);
6618 }
6619 #endif
6620
6621 #ifndef __FreeBSD__
6622 struct pf_divert *
6623 pf_find_divert(struct mbuf *m)
6624 {
6625         struct m_tag    *mtag;
6626
6627         if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL)
6628                 return (NULL);
6629
6630         return ((struct pf_divert *)(mtag + 1));
6631 }
6632
6633 struct pf_divert *
6634 pf_get_divert(struct mbuf *m)
6635 {
6636         struct m_tag    *mtag;
6637
6638         if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) {
6639                 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert),
6640                     M_NOWAIT);
6641                 if (mtag == NULL)
6642                         return (NULL);
6643                 bzero(mtag + 1, sizeof(struct pf_divert));
6644                 m_tag_prepend(m, mtag);
6645         }
6646
6647         return ((struct pf_divert *)(mtag + 1));
6648 }
6649 #endif
6650
6651 #ifdef INET
6652 int
6653 #ifdef __FreeBSD__
6654 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
6655     struct ether_header *eh, struct inpcb *inp)
6656 #else
6657 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
6658     struct ether_header *eh)
6659 #endif
6660 {
6661         struct pfi_kif          *kif;
6662         u_short                  action, reason = 0, log = 0;
6663         struct mbuf             *m = *m0;
6664 #ifdef __FreeBSD__
6665         struct ip               *h = NULL;
6666         struct m_tag            *ipfwtag;
6667         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
6668 #else
6669         struct ip               *h;
6670         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
6671 #endif
6672         struct pf_state         *s = NULL;
6673         struct pf_ruleset       *ruleset = NULL;
6674         struct pf_pdesc          pd;
6675         int                      off, dirndx, pqid = 0;
6676
6677 #ifdef __FreeBSD__
6678         PF_LOCK();
6679         if (!V_pf_status.running)
6680         {
6681                 PF_UNLOCK();
6682                 return (PF_PASS);
6683         }
6684 #else
6685         if (!pf_status.running)
6686                 return (PF_PASS);
6687 #endif
6688
6689         memset(&pd, 0, sizeof(pd));
6690 #ifdef __FreeBSD__
6691         if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) {
6692                 PF_UNLOCK();
6693                 DPFPRINTF(PF_DEBUG_URGENT,
6694                     ("pf_test: pf_get_mtag returned NULL\n"));
6695                 return (PF_DROP);
6696         }
6697 #endif
6698 #ifndef __FreeBSD__
6699         if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
6700                 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
6701         else
6702 #endif
6703                 kif = (struct pfi_kif *)ifp->if_pf_kif;
6704
6705         if (kif == NULL) {
6706 #ifdef __FreeBSD__
6707                 PF_UNLOCK();
6708 #endif
6709                 DPFPRINTF(PF_DEBUG_URGENT,
6710                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
6711                 return (PF_DROP);
6712         }
6713         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6714 #ifdef __FreeBSD__
6715         {
6716                 PF_UNLOCK();
6717 #endif
6718                 return (PF_PASS);
6719 #ifdef __FreeBSD__
6720         }
6721 #endif
6722
6723 #ifdef __FreeBSD__
6724         M_ASSERTPKTHDR(m);
6725 #else
6726 #ifdef DIAGNOSTIC
6727         if ((m->m_flags & M_PKTHDR) == 0)
6728                 panic("non-M_PKTHDR is passed to pf_test");
6729 #endif /* DIAGNOSTIC */
6730 #endif
6731
6732         if (m->m_pkthdr.len < (int)sizeof(*h)) {
6733                 action = PF_DROP;
6734                 REASON_SET(&reason, PFRES_SHORT);
6735                 log = 1;
6736                 goto done;
6737         }
6738
6739 #ifdef __FreeBSD__
6740         if (m->m_flags & M_SKIP_FIREWALL) {
6741                 PF_UNLOCK();
6742                 return (PF_PASS);
6743         }
6744 #else
6745         if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED)
6746                 return (PF_PASS);
6747 #endif
6748
6749 #ifdef __FreeBSD__
6750         if (ip_divert_ptr != NULL &&
6751             ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) {
6752                 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1);
6753                 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) {
6754                         pd.pf_mtag->flags |= PF_PACKET_LOOPED;
6755                         m_tag_delete(m, ipfwtag);
6756                 }
6757                 if (pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) {
6758                         m->m_flags |= M_FASTFWD_OURS;
6759                         pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT;
6760                 }
6761         } else
6762 #endif
6763         /* We do IP header normalization and packet reassembly here */
6764         if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
6765                 action = PF_DROP;
6766                 goto done;
6767         }
6768         m = *m0;        /* pf_normalize messes with m0 */
6769         h = mtod(m, struct ip *);
6770
6771         off = h->ip_hl << 2;
6772         if (off < (int)sizeof(*h)) {
6773                 action = PF_DROP;
6774                 REASON_SET(&reason, PFRES_SHORT);
6775                 log = 1;
6776                 goto done;
6777         }
6778
6779         pd.src = (struct pf_addr *)&h->ip_src;
6780         pd.dst = (struct pf_addr *)&h->ip_dst;
6781         pd.sport = pd.dport = NULL;
6782         pd.ip_sum = &h->ip_sum;
6783         pd.proto_sum = NULL;
6784         pd.proto = h->ip_p;
6785         pd.dir = dir;
6786         pd.sidx = (dir == PF_IN) ? 0 : 1;
6787         pd.didx = (dir == PF_IN) ? 1 : 0;
6788         pd.af = AF_INET;
6789         pd.tos = h->ip_tos;
6790         pd.tot_len = ntohs(h->ip_len);
6791         pd.eh = eh;
6792
6793         /* handle fragments that didn't get reassembled by normalization */
6794         if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
6795                 action = pf_test_fragment(&r, dir, kif, m, h,
6796                     &pd, &a, &ruleset);
6797                 goto done;
6798         }
6799
6800         switch (h->ip_p) {
6801
6802         case IPPROTO_TCP: {
6803                 struct tcphdr   th;
6804
6805                 pd.hdr.tcp = &th;
6806                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6807                     &action, &reason, AF_INET)) {
6808                         log = action != PF_PASS;
6809                         goto done;
6810                 }
6811                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6812                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
6813                         pqid = 1;
6814                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6815                 if (action == PF_DROP)
6816                         goto done;
6817                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6818                     &reason);
6819                 if (action == PF_PASS) {
6820 #if NPFSYNC > 0
6821 #ifdef __FreeBSD__
6822                         if (pfsync_update_state_ptr != NULL)
6823                                 pfsync_update_state_ptr(s);
6824 #else
6825                         pfsync_update_state(s);
6826 #endif
6827 #endif /* NPFSYNC */
6828                         r = s->rule.ptr;
6829                         a = s->anchor.ptr;
6830                         log = s->log;
6831                 } else if (s == NULL)
6832 #ifdef __FreeBSD__
6833                         action = pf_test_rule(&r, &s, dir, kif,
6834                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6835 #else
6836                         action = pf_test_rule(&r, &s, dir, kif,
6837                             m, off, h, &pd, &a, &ruleset, &ipintrq);
6838 #endif
6839                 break;
6840         }
6841
6842         case IPPROTO_UDP: {
6843                 struct udphdr   uh;
6844
6845                 pd.hdr.udp = &uh;
6846                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6847                     &action, &reason, AF_INET)) {
6848                         log = action != PF_PASS;
6849                         goto done;
6850                 }
6851                 if (uh.uh_dport == 0 ||
6852                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6853                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6854                         action = PF_DROP;
6855                         REASON_SET(&reason, PFRES_SHORT);
6856                         goto done;
6857                 }
6858                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6859                 if (action == PF_PASS) {
6860 #if NPFSYNC > 0
6861 #ifdef __FreeBSD__
6862                         if (pfsync_update_state_ptr != NULL)
6863                                 pfsync_update_state_ptr(s);
6864 #else
6865                         pfsync_update_state(s);
6866 #endif
6867 #endif /* NPFSYNC */
6868                         r = s->rule.ptr;
6869                         a = s->anchor.ptr;
6870                         log = s->log;
6871                 } else if (s == NULL)
6872 #ifdef __FreeBSD__
6873                         action = pf_test_rule(&r, &s, dir, kif,
6874                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6875 #else
6876                         action = pf_test_rule(&r, &s, dir, kif,
6877                             m, off, h, &pd, &a, &ruleset, &ipintrq);
6878 #endif
6879                 break;
6880         }
6881
6882         case IPPROTO_ICMP: {
6883                 struct icmp     ih;
6884
6885                 pd.hdr.icmp = &ih;
6886                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
6887                     &action, &reason, AF_INET)) {
6888                         log = action != PF_PASS;
6889                         goto done;
6890                 }
6891                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
6892                     &reason);
6893                 if (action == PF_PASS) {
6894 #if NPFSYNC > 0
6895 #ifdef __FreeBSD__
6896                         if (pfsync_update_state_ptr != NULL)
6897                                 pfsync_update_state_ptr(s);
6898 #else
6899                         pfsync_update_state(s);
6900 #endif
6901 #endif /* NPFSYNC */
6902                         r = s->rule.ptr;
6903                         a = s->anchor.ptr;
6904                         log = s->log;
6905                 } else if (s == NULL)
6906 #ifdef __FreeBSD__
6907                         action = pf_test_rule(&r, &s, dir, kif,
6908                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6909 #else
6910                         action = pf_test_rule(&r, &s, dir, kif,
6911                             m, off, h, &pd, &a, &ruleset, &ipintrq);
6912 #endif
6913                 break;
6914         }
6915
6916 #ifdef INET6
6917         case IPPROTO_ICMPV6: {
6918                 action = PF_DROP;
6919                 DPFPRINTF(PF_DEBUG_MISC,
6920                     ("pf: dropping IPv4 packet with ICMPv6 payload\n"));
6921                 goto done;
6922         }
6923 #endif
6924
6925         default:
6926                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6927                 if (action == PF_PASS) {
6928 #if NPFSYNC > 0
6929 #ifdef __FreeBSD__
6930                         if (pfsync_update_state_ptr != NULL)
6931                                 pfsync_update_state_ptr(s);
6932 #else
6933                         pfsync_update_state(s);
6934 #endif
6935 #endif /* NPFSYNC */
6936                         r = s->rule.ptr;
6937                         a = s->anchor.ptr;
6938                         log = s->log;
6939                 } else if (s == NULL)
6940 #ifdef __FreeBSD__
6941                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6942                             &pd, &a, &ruleset, NULL, inp);
6943 #else
6944                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6945                             &pd, &a, &ruleset, &ipintrq);
6946 #endif
6947                 break;
6948         }
6949
6950 done:
6951         if (action == PF_PASS && h->ip_hl > 5 &&
6952             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6953                 action = PF_DROP;
6954                 REASON_SET(&reason, PFRES_IPOPTIONS);
6955                 log = 1;
6956                 DPFPRINTF(PF_DEBUG_MISC,
6957                     ("pf: dropping packet with ip options\n"));
6958         }
6959
6960         if ((s && s->tag) || r->rtableid >= 0)
6961 #ifdef __FreeBSD__
6962                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid, pd.pf_mtag);
6963 #else
6964                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6965 #endif
6966
6967         if (dir == PF_IN && s && s->key[PF_SK_STACK])
6968 #ifdef __FreeBSD__
6969                 pd.pf_mtag->statekey = s->key[PF_SK_STACK];
6970 #else
6971                 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
6972 #endif
6973
6974 #ifdef ALTQ
6975         if (action == PF_PASS && r->qid) {
6976 #ifdef __FreeBSD__
6977                 if (pqid || (pd.tos & IPTOS_LOWDELAY))
6978                         pd.pf_mtag->qid = r->pqid;
6979                 else
6980                         pd.pf_mtag->qid = r->qid;
6981                 /* add hints for ecn */
6982                 pd.pf_mtag->hdr = h;
6983
6984 #else
6985                 if (pqid || (pd.tos & IPTOS_LOWDELAY))
6986                         m->m_pkthdr.pf.qid = r->pqid;
6987                 else
6988                         m->m_pkthdr.pf.qid = r->qid;
6989                 /* add hints for ecn */
6990                 m->m_pkthdr.pf.hdr = h;
6991 #endif
6992         }
6993 #endif /* ALTQ */
6994
6995         /*
6996          * connections redirected to loopback should not match sockets
6997          * bound specifically to loopback due to security implications,
6998          * see tcp_input() and in_pcblookup_listen().
6999          */
7000         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
7001             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
7002             (s->nat_rule.ptr->action == PF_RDR ||
7003             s->nat_rule.ptr->action == PF_BINAT) &&
7004             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
7005 #ifdef __FreeBSD__
7006                 m->m_flags |= M_SKIP_FIREWALL;
7007 #else
7008                 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
7009 #endif
7010
7011 #ifdef __FreeBSD__
7012         if (action == PF_PASS && r->divert.port &&
7013             ip_divert_ptr != NULL && !PACKET_LOOPED()) {
7014
7015                 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0,
7016                                 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO);
7017                 if (ipfwtag != NULL) {
7018                         ((struct ipfw_rule_ref *)(ipfwtag+1))->info =
7019                             ntohs(r->divert.port);
7020                         ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir;
7021
7022                         m_tag_prepend(m, ipfwtag);
7023
7024                         PF_UNLOCK();
7025
7026                         if (m->m_flags & M_FASTFWD_OURS) {
7027                                 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT;
7028                                 m->m_flags &= ~M_FASTFWD_OURS;
7029                         }
7030
7031                         ip_divert_ptr(*m0,
7032                                 dir ==  PF_IN ? DIR_IN : DIR_OUT);
7033                         *m0 = NULL;
7034                         return (action);
7035                 } else {
7036                         /* XXX: ipfw has the same behaviour! */
7037                         action = PF_DROP;
7038                         REASON_SET(&reason, PFRES_MEMORY);
7039                         log = 1;
7040                         DPFPRINTF(PF_DEBUG_MISC,
7041                             ("pf: failed to allocate divert tag\n"));
7042                 }
7043         }
7044 #else
7045         if (dir == PF_IN && action == PF_PASS && r->divert.port) {
7046                 struct pf_divert *divert;
7047
7048                 if ((divert = pf_get_divert(m))) {
7049                         m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
7050                         divert->port = r->divert.port;
7051                         divert->addr.ipv4 = r->divert.addr.v4;
7052                 }
7053         }
7054 #endif
7055
7056         if (log) {
7057                 struct pf_rule *lr;
7058
7059                 if (s != NULL && s->nat_rule.ptr != NULL &&
7060                     s->nat_rule.ptr->log & PF_LOG_ALL)
7061                         lr = s->nat_rule.ptr;
7062                 else
7063                         lr = r;
7064                 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset,
7065                     &pd);
7066         }
7067
7068         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
7069         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
7070
7071         if (action == PF_PASS || r->action == PF_DROP) {
7072                 dirndx = (dir == PF_OUT);
7073                 r->packets[dirndx]++;
7074                 r->bytes[dirndx] += pd.tot_len;
7075                 if (a != NULL) {
7076                         a->packets[dirndx]++;
7077                         a->bytes[dirndx] += pd.tot_len;
7078                 }
7079                 if (s != NULL) {
7080                         if (s->nat_rule.ptr != NULL) {
7081                                 s->nat_rule.ptr->packets[dirndx]++;
7082                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
7083                         }
7084                         if (s->src_node != NULL) {
7085                                 s->src_node->packets[dirndx]++;
7086                                 s->src_node->bytes[dirndx] += pd.tot_len;
7087                         }
7088                         if (s->nat_src_node != NULL) {
7089                                 s->nat_src_node->packets[dirndx]++;
7090                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
7091                         }
7092                         dirndx = (dir == s->direction) ? 0 : 1;
7093                         s->packets[dirndx]++;
7094                         s->bytes[dirndx] += pd.tot_len;
7095                 }
7096                 tr = r;
7097                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
7098 #ifdef __FreeBSD__
7099                 if (nr != NULL && r == &V_pf_default_rule)
7100 #else
7101                 if (nr != NULL && r == &pf_default_rule)
7102 #endif
7103                         tr = nr;
7104                 if (tr->src.addr.type == PF_ADDR_TABLE)
7105                         pfr_update_stats(tr->src.addr.p.tbl,
7106                             (s == NULL) ? pd.src :
7107                             &s->key[(s->direction == PF_IN)]->
7108                                 addr[(s->direction == PF_OUT)],
7109                             pd.af, pd.tot_len, dir == PF_OUT,
7110                             r->action == PF_PASS, tr->src.neg);
7111                 if (tr->dst.addr.type == PF_ADDR_TABLE)
7112                         pfr_update_stats(tr->dst.addr.p.tbl,
7113                             (s == NULL) ? pd.dst :
7114                             &s->key[(s->direction == PF_IN)]->
7115                                 addr[(s->direction == PF_IN)],
7116                             pd.af, pd.tot_len, dir == PF_OUT,
7117                             r->action == PF_PASS, tr->dst.neg);
7118         }
7119
7120         switch (action) {
7121         case PF_SYNPROXY_DROP:
7122                 m_freem(*m0);
7123         case PF_DEFER:
7124                 *m0 = NULL;
7125                 action = PF_PASS;
7126                 break;
7127         default:
7128                 /* pf_route can free the mbuf causing *m0 to become NULL */
7129                 if (r->rt)
7130                         pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
7131                 break;
7132         }
7133 #ifdef __FreeBSD__
7134         PF_UNLOCK();
7135 #endif
7136         return (action);
7137 }
7138 #endif /* INET */
7139
7140 #ifdef INET6
7141 int
7142 #ifdef __FreeBSD__
7143 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
7144     struct ether_header *eh, struct inpcb *inp)
7145 #else
7146 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
7147     struct ether_header *eh)
7148 #endif
7149 {
7150         struct pfi_kif          *kif;
7151         u_short                  action, reason = 0, log = 0;
7152         struct mbuf             *m = *m0, *n = NULL;
7153 #ifdef __FreeBSD__
7154         struct ip6_hdr          *h = NULL;
7155         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
7156 #else
7157         struct ip6_hdr          *h;
7158         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
7159 #endif
7160         struct pf_state         *s = NULL;
7161         struct pf_ruleset       *ruleset = NULL;
7162         struct pf_pdesc          pd;
7163         int                      off, terminal = 0, dirndx, rh_cnt = 0;
7164
7165 #ifdef __FreeBSD__
7166         PF_LOCK();
7167         if (!V_pf_status.running) {
7168                 PF_UNLOCK();
7169                 return (PF_PASS);
7170         }
7171 #else
7172         if (!pf_status.running)
7173                 return (PF_PASS);
7174 #endif
7175
7176         memset(&pd, 0, sizeof(pd));
7177 #ifdef __FreeBSD__
7178         if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) {
7179                 PF_UNLOCK();
7180                 DPFPRINTF(PF_DEBUG_URGENT,
7181                     ("pf_test: pf_get_mtag returned NULL\n"));
7182                 return (PF_DROP);
7183         }
7184 #endif
7185 #ifndef __FreeBSD__
7186         if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
7187                 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
7188         else
7189 #endif
7190                 kif = (struct pfi_kif *)ifp->if_pf_kif;
7191
7192         if (kif == NULL) {
7193 #ifdef __FreeBSD__
7194                 PF_UNLOCK();
7195 #endif
7196                 DPFPRINTF(PF_DEBUG_URGENT,
7197                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
7198                 return (PF_DROP);
7199         }
7200         if (kif->pfik_flags & PFI_IFLAG_SKIP)
7201 #ifdef __FreeBSD__
7202         {
7203                 PF_UNLOCK();
7204 #endif
7205                 return (PF_PASS);
7206 #ifdef __FreeBSD__
7207         }
7208 #endif
7209
7210 #ifdef __FreeBSD__
7211         M_ASSERTPKTHDR(m);
7212 #else
7213 #ifdef DIAGNOSTIC
7214         if ((m->m_flags & M_PKTHDR) == 0)
7215                 panic("non-M_PKTHDR is passed to pf_test6");
7216 #endif /* DIAGNOSTIC */
7217 #endif
7218
7219         if (m->m_pkthdr.len < (int)sizeof(*h)) {
7220                 action = PF_DROP;
7221                 REASON_SET(&reason, PFRES_SHORT);
7222                 log = 1;
7223                 goto done;
7224         }
7225
7226 #ifdef __FreeBSD__
7227         if (pd.pf_mtag->flags & PF_TAG_GENERATED) {
7228                 PF_UNLOCK();
7229 #else
7230         if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED)
7231 #endif
7232                 return (PF_PASS);
7233 #ifdef __FreeBSD__
7234         }
7235 #endif
7236
7237         /* We do IP header normalization and packet reassembly here */
7238         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
7239                 action = PF_DROP;
7240                 goto done;
7241         }
7242         m = *m0;        /* pf_normalize messes with m0 */
7243         h = mtod(m, struct ip6_hdr *);
7244
7245 #if 1
7246         /*
7247          * we do not support jumbogram yet.  if we keep going, zero ip6_plen
7248          * will do something bad, so drop the packet for now.
7249          */
7250         if (htons(h->ip6_plen) == 0) {
7251                 action = PF_DROP;
7252                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
7253                 goto done;
7254         }
7255 #endif
7256
7257         pd.src = (struct pf_addr *)&h->ip6_src;
7258         pd.dst = (struct pf_addr *)&h->ip6_dst;
7259         pd.sport = pd.dport = NULL;
7260         pd.ip_sum = NULL;
7261         pd.proto_sum = NULL;
7262         pd.dir = dir;
7263         pd.sidx = (dir == PF_IN) ? 0 : 1;
7264         pd.didx = (dir == PF_IN) ? 1 : 0;
7265         pd.af = AF_INET6;
7266         pd.tos = 0;
7267         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
7268         pd.eh = eh;
7269
7270         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
7271         pd.proto = h->ip6_nxt;
7272         do {
7273                 switch (pd.proto) {
7274                 case IPPROTO_FRAGMENT:
7275                         action = pf_test_fragment(&r, dir, kif, m, h,
7276                             &pd, &a, &ruleset);
7277                         if (action == PF_DROP)
7278                                 REASON_SET(&reason, PFRES_FRAG);
7279                         goto done;
7280                 case IPPROTO_ROUTING: {
7281                         struct ip6_rthdr rthdr;
7282
7283                         if (rh_cnt++) {
7284                                 DPFPRINTF(PF_DEBUG_MISC,
7285                                     ("pf: IPv6 more than one rthdr\n"));
7286                                 action = PF_DROP;
7287                                 REASON_SET(&reason, PFRES_IPOPTIONS);
7288                                 log = 1;
7289                                 goto done;
7290                         }
7291                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
7292                             &reason, pd.af)) {
7293                                 DPFPRINTF(PF_DEBUG_MISC,
7294                                     ("pf: IPv6 short rthdr\n"));
7295                                 action = PF_DROP;
7296                                 REASON_SET(&reason, PFRES_SHORT);
7297                                 log = 1;
7298                                 goto done;
7299                         }
7300                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
7301                                 DPFPRINTF(PF_DEBUG_MISC,
7302                                     ("pf: IPv6 rthdr0\n"));
7303                                 action = PF_DROP;
7304                                 REASON_SET(&reason, PFRES_IPOPTIONS);
7305                                 log = 1;
7306                                 goto done;
7307                         }
7308                         /* FALLTHROUGH */
7309                 }
7310                 case IPPROTO_AH:
7311                 case IPPROTO_HOPOPTS:
7312                 case IPPROTO_DSTOPTS: {
7313                         /* get next header and header length */
7314                         struct ip6_ext  opt6;
7315
7316                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
7317                             NULL, &reason, pd.af)) {
7318                                 DPFPRINTF(PF_DEBUG_MISC,
7319                                     ("pf: IPv6 short opt\n"));
7320                                 action = PF_DROP;
7321                                 log = 1;
7322                                 goto done;
7323                         }
7324                         if (pd.proto == IPPROTO_AH)
7325                                 off += (opt6.ip6e_len + 2) * 4;
7326                         else
7327                                 off += (opt6.ip6e_len + 1) * 8;
7328                         pd.proto = opt6.ip6e_nxt;
7329                         /* goto the next header */
7330                         break;
7331                 }
7332                 default:
7333                         terminal++;
7334                         break;
7335                 }
7336         } while (!terminal);
7337
7338         /* if there's no routing header, use unmodified mbuf for checksumming */
7339         if (!n)
7340                 n = m;
7341
7342         switch (pd.proto) {
7343
7344         case IPPROTO_TCP: {
7345                 struct tcphdr   th;
7346
7347                 pd.hdr.tcp = &th;
7348                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
7349                     &action, &reason, AF_INET6)) {
7350                         log = action != PF_PASS;
7351                         goto done;
7352                 }
7353                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
7354                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
7355                 if (action == PF_DROP)
7356                         goto done;
7357                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
7358                     &reason);
7359                 if (action == PF_PASS) {
7360 #if NPFSYNC > 0
7361 #ifdef __FreeBSD__
7362                         if (pfsync_update_state_ptr != NULL)
7363                                 pfsync_update_state_ptr(s);
7364 #else
7365                         pfsync_update_state(s);
7366 #endif
7367 #endif /* NPFSYNC */
7368                         r = s->rule.ptr;
7369                         a = s->anchor.ptr;
7370                         log = s->log;
7371                 } else if (s == NULL)
7372 #ifdef __FreeBSD__
7373                         action = pf_test_rule(&r, &s, dir, kif,
7374                             m, off, h, &pd, &a, &ruleset, NULL, inp);
7375 #else
7376                         action = pf_test_rule(&r, &s, dir, kif,
7377                             m, off, h, &pd, &a, &ruleset, &ip6intrq);
7378 #endif
7379                 break;
7380         }
7381
7382         case IPPROTO_UDP: {
7383                 struct udphdr   uh;
7384
7385                 pd.hdr.udp = &uh;
7386                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
7387                     &action, &reason, AF_INET6)) {
7388                         log = action != PF_PASS;
7389                         goto done;
7390                 }
7391                 if (uh.uh_dport == 0 ||
7392                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
7393                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
7394                         action = PF_DROP;
7395                         REASON_SET(&reason, PFRES_SHORT);
7396                         goto done;
7397                 }
7398                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
7399                 if (action == PF_PASS) {
7400 #if NPFSYNC > 0
7401 #ifdef __FreeBSD__
7402                         if (pfsync_update_state_ptr != NULL)
7403                                 pfsync_update_state_ptr(s);
7404 #else
7405                         pfsync_update_state(s);
7406 #endif
7407 #endif /* NPFSYNC */
7408                         r = s->rule.ptr;
7409                         a = s->anchor.ptr;
7410                         log = s->log;
7411                 } else if (s == NULL)
7412 #ifdef __FreeBSD__
7413                         action = pf_test_rule(&r, &s, dir, kif,
7414                             m, off, h, &pd, &a, &ruleset, NULL, inp);
7415 #else
7416                         action = pf_test_rule(&r, &s, dir, kif,
7417                             m, off, h, &pd, &a, &ruleset, &ip6intrq);
7418 #endif
7419                 break;
7420         }
7421
7422         case IPPROTO_ICMP: {
7423                 action = PF_DROP;
7424                 DPFPRINTF(PF_DEBUG_MISC,
7425                     ("pf: dropping IPv6 packet with ICMPv4 payload\n"));
7426                 goto done;
7427         }
7428
7429         case IPPROTO_ICMPV6: {
7430                 struct icmp6_hdr        ih;
7431
7432                 pd.hdr.icmp6 = &ih;
7433                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
7434                     &action, &reason, AF_INET6)) {
7435                         log = action != PF_PASS;
7436                         goto done;
7437                 }
7438                 action = pf_test_state_icmp(&s, dir, kif,
7439                     m, off, h, &pd, &reason);
7440                 if (action == PF_PASS) {
7441 #if NPFSYNC > 0
7442 #ifdef __FreeBSD__
7443                         if (pfsync_update_state_ptr != NULL)
7444                                 pfsync_update_state_ptr(s);
7445 #else
7446                         pfsync_update_state(s);
7447 #endif
7448 #endif /* NPFSYNC */
7449                         r = s->rule.ptr;
7450                         a = s->anchor.ptr;
7451                         log = s->log;
7452                 } else if (s == NULL)
7453 #ifdef __FreeBSD__
7454                         action = pf_test_rule(&r, &s, dir, kif,
7455                             m, off, h, &pd, &a, &ruleset, NULL, inp);
7456 #else
7457                         action = pf_test_rule(&r, &s, dir, kif,
7458                             m, off, h, &pd, &a, &ruleset, &ip6intrq);
7459 #endif
7460                 break;
7461         }
7462
7463         default:
7464                 action = pf_test_state_other(&s, dir, kif, m, &pd);
7465                 if (action == PF_PASS) {
7466 #if NPFSYNC > 0
7467 #ifdef __FreeBSD__
7468                         if (pfsync_update_state_ptr != NULL)
7469                                 pfsync_update_state_ptr(s);
7470 #else
7471                         pfsync_update_state(s);
7472 #endif
7473 #endif /* NPFSYNC */
7474                         r = s->rule.ptr;
7475                         a = s->anchor.ptr;
7476                         log = s->log;
7477                 } else if (s == NULL)
7478 #ifdef __FreeBSD__
7479                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
7480                             &pd, &a, &ruleset, NULL, inp);
7481 #else
7482                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
7483                             &pd, &a, &ruleset, &ip6intrq);
7484 #endif
7485                 break;
7486         }
7487
7488 done:
7489         if (n != m) {
7490                 m_freem(n);
7491                 n = NULL;
7492         }
7493
7494         /* handle dangerous IPv6 extension headers. */
7495         if (action == PF_PASS && rh_cnt &&
7496             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
7497                 action = PF_DROP;
7498                 REASON_SET(&reason, PFRES_IPOPTIONS);
7499                 log = 1;
7500                 DPFPRINTF(PF_DEBUG_MISC,
7501                     ("pf: dropping packet with dangerous v6 headers\n"));
7502         }
7503
7504         if ((s && s->tag) || r->rtableid >= 0)
7505 #ifdef __FreeBSD__
7506                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid, pd.pf_mtag);
7507 #else
7508                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
7509 #endif
7510
7511         if (dir == PF_IN && s && s->key[PF_SK_STACK])
7512 #ifdef __FreeBSD__
7513                 pd.pf_mtag->statekey = s->key[PF_SK_STACK];
7514 #else
7515                 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
7516 #endif
7517
7518 #ifdef ALTQ
7519         if (action == PF_PASS && r->qid) {
7520 #ifdef __FreeBSD__
7521                 if (pd.tos & IPTOS_LOWDELAY)
7522                         pd.pf_mtag->qid = r->pqid;
7523                 else
7524                         pd.pf_mtag->qid = r->qid;
7525                 /* add hints for ecn */
7526                 pd.pf_mtag->hdr = h;
7527 #else
7528                 if (pd.tos & IPTOS_LOWDELAY)
7529                         m->m_pkthdr.pf.qid = r->pqid;
7530                 else
7531                         m->m_pkthdr.pf.qid = r->qid;
7532                 /* add hints for ecn */
7533                 m->m_pkthdr.pf.hdr = h;
7534 #endif
7535         }
7536 #endif /* ALTQ */
7537
7538         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
7539             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
7540             (s->nat_rule.ptr->action == PF_RDR ||
7541             s->nat_rule.ptr->action == PF_BINAT) &&
7542             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
7543 #ifdef __FreeBSD__
7544                 m->m_flags |= M_SKIP_FIREWALL;
7545 #else
7546                 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
7547 #endif
7548
7549 #ifdef __FreeBSD__
7550         /* XXX: Anybody working on it?! */
7551         if (r->divert.port)
7552                 printf("pf: divert(9) is not supported for IPv6\n");
7553 #else
7554         if (dir == PF_IN && action == PF_PASS && r->divert.port) {
7555                 struct pf_divert *divert;
7556
7557                 if ((divert = pf_get_divert(m))) {
7558                         m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
7559                         divert->port = r->divert.port;
7560                         divert->addr.ipv6 = r->divert.addr.v6;
7561                 }
7562         }
7563 #endif
7564
7565         if (log) {
7566                 struct pf_rule *lr;
7567
7568                 if (s != NULL && s->nat_rule.ptr != NULL &&
7569                     s->nat_rule.ptr->log & PF_LOG_ALL)
7570                         lr = s->nat_rule.ptr;
7571                 else
7572                         lr = r;
7573                 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset,
7574                     &pd);
7575         }
7576
7577         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
7578         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
7579
7580         if (action == PF_PASS || r->action == PF_DROP) {
7581                 dirndx = (dir == PF_OUT);
7582                 r->packets[dirndx]++;
7583                 r->bytes[dirndx] += pd.tot_len;
7584                 if (a != NULL) {
7585                         a->packets[dirndx]++;
7586                         a->bytes[dirndx] += pd.tot_len;
7587                 }
7588                 if (s != NULL) {
7589                         if (s->nat_rule.ptr != NULL) {
7590                                 s->nat_rule.ptr->packets[dirndx]++;
7591                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
7592                         }
7593                         if (s->src_node != NULL) {
7594                                 s->src_node->packets[dirndx]++;
7595                                 s->src_node->bytes[dirndx] += pd.tot_len;
7596                         }
7597                         if (s->nat_src_node != NULL) {
7598                                 s->nat_src_node->packets[dirndx]++;
7599                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
7600                         }
7601                         dirndx = (dir == s->direction) ? 0 : 1;
7602                         s->packets[dirndx]++;
7603                         s->bytes[dirndx] += pd.tot_len;
7604                 }
7605                 tr = r;
7606                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
7607 #ifdef __FreeBSD__
7608                 if (nr != NULL && r == &V_pf_default_rule)
7609 #else
7610                 if (nr != NULL && r == &pf_default_rule)
7611 #endif
7612                         tr = nr;
7613                 if (tr->src.addr.type == PF_ADDR_TABLE)
7614                         pfr_update_stats(tr->src.addr.p.tbl,
7615                             (s == NULL) ? pd.src :
7616                             &s->key[(s->direction == PF_IN)]->addr[0],
7617                             pd.af, pd.tot_len, dir == PF_OUT,
7618                             r->action == PF_PASS, tr->src.neg);
7619                 if (tr->dst.addr.type == PF_ADDR_TABLE)
7620                         pfr_update_stats(tr->dst.addr.p.tbl,
7621                             (s == NULL) ? pd.dst :
7622                             &s->key[(s->direction == PF_IN)]->addr[1],
7623                             pd.af, pd.tot_len, dir == PF_OUT,
7624                             r->action == PF_PASS, tr->dst.neg);
7625         }
7626
7627         switch (action) {
7628         case PF_SYNPROXY_DROP:
7629                 m_freem(*m0);
7630         case PF_DEFER:
7631                 *m0 = NULL;
7632                 action = PF_PASS;
7633                 break;
7634         default:
7635                 /* pf_route6 can free the mbuf causing *m0 to become NULL */
7636                 if (r->rt)
7637                         pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
7638                 break;
7639         }
7640
7641 #ifdef __FreeBSD__
7642         PF_UNLOCK();
7643 #endif
7644         return (action);
7645 }
7646 #endif /* INET6 */
7647
7648 int
7649 pf_check_congestion(struct ifqueue *ifq)
7650 {
7651 #ifdef __FreeBSD__
7652         /* XXX_IMPORT: later */
7653         return (0);
7654 #else
7655         if (ifq->ifq_congestion)
7656                 return (1);
7657         else
7658                 return (0);
7659 #endif
7660 }
7661
7662 /*
7663  * must be called whenever any addressing information such as
7664  * address, port, protocol has changed
7665  */
7666 void
7667 pf_pkt_addr_changed(struct mbuf *m)
7668 {
7669 #ifdef __FreeBSD__
7670         struct pf_mtag  *pf_tag;
7671
7672         if ((pf_tag = pf_find_mtag(m)) != NULL)
7673                 pf_tag->statekey = NULL;
7674 #else
7675         m->m_pkthdr.pf.statekey = NULL;
7676 #endif
7677 }