sys/net/pf/pf.c

   1 /*      $OpenBSD: pf.c,v 1.614 2008/08/02 12:34:37 henning Exp $ */
   2
   3 /*
   4  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
   5  *
   6  * Copyright (c) 2001 Daniel Hartmeier
   7  * Copyright (c) 2002 - 2008 Henning Brauer
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  *
  14  *    - Redistributions of source code must retain the above copyright
  15  *      notice, this list of conditions and the following disclaimer.
  16  *    - Redistributions in binary form must reproduce the above
  17  *      copyright notice, this list of conditions and the following
  18  *      disclaimer in the documentation and/or other materials provided
  19  *      with the distribution.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  29  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  31  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * Effort sponsored in part by the Defense Advanced Research Projects
  35  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  36  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  37  *
  38  */
  39
  40 #include "opt_inet.h"
  41 #include "opt_inet6.h"
  42
  43 #include <sys/param.h>
  44 #include <sys/systm.h>
  45 #include <sys/malloc.h>
  46 #include <sys/mbuf.h>
  47 #include <sys/filio.h>
  48 #include <sys/socket.h>
  49 #include <sys/socketvar.h>
  50 #include <sys/kernel.h>
  51 #include <sys/time.h>
  52 #include <sys/sysctl.h>
  53 #include <sys/endian.h>
  54 #include <vm/vm_zone.h>
  55 #include <sys/proc.h>
  56 #include <sys/kthread.h>
  57
  58 #include <machine/inttypes.h>
  59
  60 #include <sys/md5.h>
  61
  62 #include <net/if.h>
  63 #include <net/if_types.h>
  64 #include <net/bpf.h>
  65 #include <net/netisr.h>
  66 #include <net/route.h>
  67
  68 #include <netinet/in.h>
  69 #include <netinet/in_var.h>
  70 #include <netinet/in_systm.h>
  71 #include <netinet/ip.h>
  72 #include <netinet/ip_var.h>
  73 #include <netinet/tcp.h>
  74 #include <netinet/tcp_seq.h>
  75 #include <netinet/udp.h>
  76 #include <netinet/ip_icmp.h>
  77 #include <netinet/in_pcb.h>
  78 #include <netinet/tcp_timer.h>
  79 #include <netinet/tcp_var.h>
  80 #include <netinet/udp_var.h>
  81 #include <netinet/icmp_var.h>
  82 #include <netinet/if_ether.h>
  83
  84 #include <net/pf/pfvar.h>
  85 #include <net/pf/if_pflog.h>
  86
  87 #include <net/pf/if_pfsync.h>
  88
  89 #ifdef INET6
  90 #include <netinet/ip6.h>
  91 #include <netinet/in_pcb.h>
  92 #include <netinet/icmp6.h>
  93 #include <netinet6/nd6.h>
  94 #include <netinet6/ip6_var.h>
  95 #include <netinet6/in6_pcb.h>
  96 #endif /* INET6 */
  97
  98 #include <sys/in_cksum.h>
  99 #include <sys/ucred.h>
 100 #include <machine/limits.h>
 101 #include <sys/msgport2.h>
 102 #include <net/netmsg2.h>
 103
 104 extern int ip_optcopy(struct ip *, struct ip *);
 105 extern int debug_pfugidhack;
 106
 107 struct lwkt_token pf_token = LWKT_TOKEN_INITIALIZER(pf_token);
 108
 109 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
 110
 111 /*
 112  * Global variables
 113  */
 114
 115 /* state tables */
 116 struct pf_state_tree     pf_statetbl;
 117
 118 struct pf_altqqueue      pf_altqs[2];
 119 struct pf_palist         pf_pabuf;
 120 struct pf_altqqueue     *pf_altqs_active;
 121 struct pf_altqqueue     *pf_altqs_inactive;
 122 struct pf_status         pf_status;
 123
 124 u_int32_t                ticket_altqs_active;
 125 u_int32_t                ticket_altqs_inactive;
 126 int                      altqs_inactive_open;
 127 u_int32_t                ticket_pabuf;
 128
 129 MD5_CTX                  pf_tcp_secret_ctx;
 130 u_char                   pf_tcp_secret[16];
 131 int                      pf_tcp_secret_init;
 132 int                      pf_tcp_iss_off;
 133
 134 struct pf_anchor_stackframe {
 135         struct pf_ruleset                       *rs;
 136         struct pf_rule                          *r;
 137         struct pf_anchor_node                   *parent;
 138         struct pf_anchor                        *child;
 139 } pf_anchor_stack[64];
 140
 141 vm_zone_t                pf_src_tree_pl, pf_rule_pl, pf_pooladdr_pl;
 142 vm_zone_t                pf_state_pl, pf_state_key_pl, pf_state_item_pl;
 143 vm_zone_t                pf_altq_pl;
 144
 145 void                     pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
 146
 147 void                     pf_init_threshold(struct pf_threshold *, u_int32_t,
 148                             u_int32_t);
 149 void                     pf_add_threshold(struct pf_threshold *);
 150 int                      pf_check_threshold(struct pf_threshold *);
 151
 152 void                     pf_change_ap(struct pf_addr *, u_int16_t *,
 153                             u_int16_t *, u_int16_t *, struct pf_addr *,
 154                             u_int16_t, u_int8_t, sa_family_t);
 155 int                      pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
 156                             struct tcphdr *, struct pf_state_peer *);
 157 #ifdef INET6
 158 void                     pf_change_a6(struct pf_addr *, u_int16_t *,
 159                             struct pf_addr *, u_int8_t);
 160 #endif /* INET6 */
 161 void                     pf_change_icmp(struct pf_addr *, u_int16_t *,
 162                             struct pf_addr *, struct pf_addr *, u_int16_t,
 163                             u_int16_t *, u_int16_t *, u_int16_t *,
 164                             u_int16_t *, u_int8_t, sa_family_t);
 165 void                     pf_send_tcp(const struct pf_rule *, sa_family_t,
 166                             const struct pf_addr *, const struct pf_addr *,
 167                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 168                             u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
 169                             u_int16_t, struct ether_header *, struct ifnet *);
 170 void                     pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 171                             sa_family_t, struct pf_rule *);
 172 struct pf_rule          *pf_match_translation(struct pf_pdesc *, struct mbuf *,
 173                             int, int, struct pfi_kif *,
 174                             struct pf_addr *, u_int16_t, struct pf_addr *,
 175                             u_int16_t, int);
 176 struct pf_rule          *pf_get_translation(struct pf_pdesc *, struct mbuf *,
 177                             int, int, struct pfi_kif *, struct pf_src_node **,
 178                             struct pf_state_key **, struct pf_state_key **,
 179                             struct pf_state_key **, struct pf_state_key **,
 180                             struct pf_addr *, struct pf_addr *,
 181                             u_int16_t, u_int16_t);
 182 void                     pf_detach_state(struct pf_state *);
 183 int                      pf_state_key_setup(struct pf_pdesc *, struct pf_rule *,
 184                             struct pf_state_key **, struct pf_state_key **,
 185                             struct pf_state_key **, struct pf_state_key **,
 186                             struct pf_addr *, struct pf_addr *,
 187                             u_int16_t, u_int16_t);
 188 void                     pf_state_key_detach(struct pf_state *, int);
 189 u_int32_t                pf_tcp_iss(struct pf_pdesc *);
 190 int                      pf_test_rule(struct pf_rule **, struct pf_state **,
 191                             int, struct pfi_kif *, struct mbuf *, int,
 192                             void *, struct pf_pdesc *, struct pf_rule **,
 193                             struct pf_ruleset **, struct ifqueue *, struct inpcb *);
 194 static __inline int      pf_create_state(struct pf_rule *, struct pf_rule *,
 195                             struct pf_rule *, struct pf_pdesc *,
 196                             struct pf_src_node *, struct pf_state_key *,
 197                             struct pf_state_key *, struct pf_state_key *,
 198                             struct pf_state_key *, struct mbuf *, int,
 199                             u_int16_t, u_int16_t, int *, struct pfi_kif *,
 200                             struct pf_state **, int, u_int16_t, u_int16_t,
 201                             int);
 202 int                      pf_test_fragment(struct pf_rule **, int,
 203                             struct pfi_kif *, struct mbuf *, void *,
 204                             struct pf_pdesc *, struct pf_rule **,
 205                             struct pf_ruleset **);
 206 int                      pf_tcp_track_full(struct pf_state_peer *,
 207                             struct pf_state_peer *, struct pf_state **,
 208                             struct pfi_kif *, struct mbuf *, int,
 209                             struct pf_pdesc *, u_short *, int *);
 210 int                     pf_tcp_track_sloppy(struct pf_state_peer *,
 211                             struct pf_state_peer *, struct pf_state **,
 212                             struct pf_pdesc *, u_short *);
 213 int                      pf_test_state_tcp(struct pf_state **, int,
 214                             struct pfi_kif *, struct mbuf *, int,
 215                             void *, struct pf_pdesc *, u_short *);
 216 int                      pf_test_state_udp(struct pf_state **, int,
 217                             struct pfi_kif *, struct mbuf *, int,
 218                             void *, struct pf_pdesc *);
 219 int                      pf_test_state_icmp(struct pf_state **, int,
 220                             struct pfi_kif *, struct mbuf *, int,
 221                             void *, struct pf_pdesc *, u_short *);
 222 int                      pf_test_state_other(struct pf_state **, int,
 223                             struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
 224 void                     pf_step_into_anchor(int *, struct pf_ruleset **, int,
 225                             struct pf_rule **, struct pf_rule **, int *);
 226 int                      pf_step_out_of_anchor(int *, struct pf_ruleset **,
 227                              int, struct pf_rule **, struct pf_rule **,
 228                              int *);
 229 void                     pf_hash(struct pf_addr *, struct pf_addr *,
 230                             struct pf_poolhashkey *, sa_family_t);
 231 int                      pf_map_addr(u_int8_t, struct pf_rule *,
 232                             struct pf_addr *, struct pf_addr *,
 233                             struct pf_addr *, struct pf_src_node **);
 234 int                      pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
 235                             struct pf_addr *, struct pf_addr *, u_int16_t,
 236                             struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
 237                             struct pf_src_node **);
 238 void                     pf_route(struct mbuf **, struct pf_rule *, int,
 239                             struct ifnet *, struct pf_state *,
 240                             struct pf_pdesc *);
 241 void                     pf_route6(struct mbuf **, struct pf_rule *, int,
 242                             struct ifnet *, struct pf_state *,
 243                             struct pf_pdesc *);
 244 u_int8_t                 pf_get_wscale(struct mbuf *, int, u_int16_t,
 245                             sa_family_t);
 246 u_int16_t                pf_get_mss(struct mbuf *, int, u_int16_t,
 247                             sa_family_t);
 248 u_int16_t                pf_calc_mss(struct pf_addr *, sa_family_t,
 249                                 u_int16_t);
 250 void                     pf_set_rt_ifp(struct pf_state *,
 251                             struct pf_addr *);
 252 int                      pf_check_proto_cksum(struct mbuf *, int, int,
 253                             u_int8_t, sa_family_t);
 254 struct pf_divert        *pf_get_divert(struct mbuf *);
 255 void                     pf_print_state_parts(struct pf_state *,
 256                             struct pf_state_key *, struct pf_state_key *);
 257 int                      pf_addr_wrap_neq(struct pf_addr_wrap *,
 258                             struct pf_addr_wrap *);
 259 struct pf_state         *pf_find_state(struct pfi_kif *,
 260                             struct pf_state_key_cmp *, u_int, struct mbuf *);
 261 int                      pf_src_connlimit(struct pf_state **);
 262 int                      pf_check_congestion(struct ifqueue *);
 263
 264 extern int pf_end_threads;
 265
 266 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
 267         { &pf_state_pl, PFSTATE_HIWAT },
 268         { &pf_src_tree_pl, PFSNODE_HIWAT },
 269         { &pf_frent_pl, PFFRAG_FRENT_HIWAT },
 270         { &pfr_ktable_pl, PFR_KTABLE_HIWAT },
 271         { &pfr_kentry_pl, PFR_KENTRY_HIWAT }
 272 };
 273
 274 #define STATE_LOOKUP(i, k, d, s, m)                                     \
 275         do {                                                            \
 276                 s = pf_find_state(i, k, d, m);                  \
 277                 if (s == NULL || (s)->timeout == PFTM_PURGE)            \
 278                         return (PF_DROP);                               \
 279                 if (d == PF_OUT &&                                      \
 280                     (((s)->rule.ptr->rt == PF_ROUTETO &&                \
 281                     (s)->rule.ptr->direction == PF_OUT) ||              \
 282                     ((s)->rule.ptr->rt == PF_REPLYTO &&                 \
 283                     (s)->rule.ptr->direction == PF_IN)) &&              \
 284                     (s)->rt_kif != NULL &&                              \
 285                     (s)->rt_kif != i)                                   \
 286                         return (PF_PASS);                               \
 287         } while (0)
 288
 289 #define BOUND_IFACE(r, k) \
 290         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
 291
 292 #define STATE_INC_COUNTERS(s)                           \
 293         do {                                            \
 294                 s->rule.ptr->states_cur++;              \
 295                 s->rule.ptr->states_tot++;              \
 296                 if (s->anchor.ptr != NULL) {            \
 297                         s->anchor.ptr->states_cur++;    \
 298                         s->anchor.ptr->states_tot++;    \
 299                 }                                       \
 300                 if (s->nat_rule.ptr != NULL) {          \
 301                         s->nat_rule.ptr->states_cur++;  \
 302                         s->nat_rule.ptr->states_tot++;  \
 303                 }                                       \
 304         } while (0)
 305
 306 #define STATE_DEC_COUNTERS(s)                           \
 307         do {                                            \
 308                 if (s->nat_rule.ptr != NULL)            \
 309                         s->nat_rule.ptr->states_cur--;  \
 310                 if (s->anchor.ptr != NULL)              \
 311                         s->anchor.ptr->states_cur--;    \
 312                 s->rule.ptr->states_cur--;              \
 313         } while (0)
 314
 315 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
 316 static __inline int pf_state_compare_key(struct pf_state_key *,
 317         struct pf_state_key *);
 318 static __inline int pf_state_compare_id(struct pf_state *,
 319         struct pf_state *);
 320
 321 struct pf_src_tree tree_src_tracking;
 322
 323 struct pf_state_tree_id tree_id;
 324 struct pf_state_queue state_list;
 325
 326 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
 327 RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key);
 328 RB_GENERATE(pf_state_tree_id, pf_state,
 329     entry_id, pf_state_compare_id);
 330
 331 static __inline int
 332 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
 333 {
 334         int     diff;
 335
 336         if (a->rule.ptr > b->rule.ptr)
 337                 return (1);
 338         if (a->rule.ptr < b->rule.ptr)
 339                 return (-1);
 340         if ((diff = a->af - b->af) != 0)
 341                 return (diff);
 342         switch (a->af) {
 343 #ifdef INET
 344         case AF_INET:
 345                 if (a->addr.addr32[0] > b->addr.addr32[0])
 346                         return (1);
 347                 if (a->addr.addr32[0] < b->addr.addr32[0])
 348                         return (-1);
 349                 break;
 350 #endif /* INET */
 351 #ifdef INET6
 352         case AF_INET6:
 353                 if (a->addr.addr32[3] > b->addr.addr32[3])
 354                         return (1);
 355                 if (a->addr.addr32[3] < b->addr.addr32[3])
 356                         return (-1);
 357                 if (a->addr.addr32[2] > b->addr.addr32[2])
 358                         return (1);
 359                 if (a->addr.addr32[2] < b->addr.addr32[2])
 360                         return (-1);
 361                 if (a->addr.addr32[1] > b->addr.addr32[1])
 362                         return (1);
 363                 if (a->addr.addr32[1] < b->addr.addr32[1])
 364                         return (-1);
 365                 if (a->addr.addr32[0] > b->addr.addr32[0])
 366                         return (1);
 367                 if (a->addr.addr32[0] < b->addr.addr32[0])
 368                         return (-1);
 369                 break;
 370 #endif /* INET6 */
 371         }
 372         return (0);
 373 }
 374
 375 u_int32_t
 376 pf_state_hash(struct pf_state_key *sk)
 377 {
 378         u_int32_t hv = (u_int32_t)(((intptr_t)sk >> 6) ^ ((intptr_t)sk >> 15));
 379         if (hv == 0)    /* disallow 0 */
 380                 hv = 1;
 381         return(hv);
 382 }
 383
 384 #ifdef INET6
 385 void
 386 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 387 {
 388         switch (af) {
 389 #ifdef INET
 390         case AF_INET:
 391                 dst->addr32[0] = src->addr32[0];
 392                 break;
 393 #endif /* INET */
 394         case AF_INET6:
 395                 dst->addr32[0] = src->addr32[0];
 396                 dst->addr32[1] = src->addr32[1];
 397                 dst->addr32[2] = src->addr32[2];
 398                 dst->addr32[3] = src->addr32[3];
 399                 break;
 400         }
 401 }
 402 #endif /* INET6 */
 403
 404 void
 405 pf_init_threshold(struct pf_threshold *threshold,
 406     u_int32_t limit, u_int32_t seconds)
 407 {
 408         threshold->limit = limit * PF_THRESHOLD_MULT;
 409         threshold->seconds = seconds;
 410         threshold->count = 0;
 411         threshold->last = time_second;
 412 }
 413
 414 void
 415 pf_add_threshold(struct pf_threshold *threshold)
 416 {
 417         u_int32_t t = time_second, diff = t - threshold->last;
 418
 419         if (diff >= threshold->seconds)
 420                 threshold->count = 0;
 421         else
 422                 threshold->count -= threshold->count * diff /
 423                     threshold->seconds;
 424         threshold->count += PF_THRESHOLD_MULT;
 425         threshold->last = t;
 426 }
 427
 428 int
 429 pf_check_threshold(struct pf_threshold *threshold)
 430 {
 431         return (threshold->count > threshold->limit);
 432 }
 433
 434 int
 435 pf_src_connlimit(struct pf_state **state)
 436 {
 437         int bad = 0;
 438
 439         (*state)->src_node->conn++;
 440         (*state)->src.tcp_est = 1;
 441         pf_add_threshold(&(*state)->src_node->conn_rate);
 442
 443         if ((*state)->rule.ptr->max_src_conn &&
 444             (*state)->rule.ptr->max_src_conn <
 445             (*state)->src_node->conn) {
 446                 pf_status.lcounters[LCNT_SRCCONN]++;
 447                 bad++;
 448         }
 449
 450         if ((*state)->rule.ptr->max_src_conn_rate.limit &&
 451             pf_check_threshold(&(*state)->src_node->conn_rate)) {
 452                 pf_status.lcounters[LCNT_SRCCONNRATE]++;
 453                 bad++;
 454         }
 455
 456         if (!bad)
 457                 return (0);
 458
 459         if ((*state)->rule.ptr->overload_tbl) {
 460                 struct pfr_addr p;
 461                 u_int32_t       killed = 0;
 462
 463                 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
 464                 if (pf_status.debug >= PF_DEBUG_MISC) {
 465                         kprintf("pf_src_connlimit: blocking address ");
 466                         pf_print_host(&(*state)->src_node->addr, 0,
 467                             (*state)->key[PF_SK_WIRE]->af);
 468                 }
 469
 470                 bzero(&p, sizeof(p));
 471                 p.pfra_af = (*state)->key[PF_SK_WIRE]->af;
 472                 switch ((*state)->key[PF_SK_WIRE]->af) {
 473 #ifdef INET
 474                 case AF_INET:
 475                         p.pfra_net = 32;
 476                         p.pfra_ip4addr = (*state)->src_node->addr.v4;
 477                         break;
 478 #endif /* INET */
 479 #ifdef INET6
 480                 case AF_INET6:
 481                         p.pfra_net = 128;
 482                         p.pfra_ip6addr = (*state)->src_node->addr.v6;
 483                         break;
 484 #endif /* INET6 */
 485                 }
 486
 487                 pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
 488                     &p, time_second);
 489
 490                 /* kill existing states if that's required. */
 491                 if ((*state)->rule.ptr->flush) {
 492                         struct pf_state_key *sk;
 493                         struct pf_state *st;
 494
 495                         pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
 496                         RB_FOREACH(st, pf_state_tree_id, &tree_id) {
 497                                 sk = st->key[PF_SK_WIRE];
 498                                 /*
 499                                  * Kill states from this source.  (Only those
 500                                  * from the same rule if PF_FLUSH_GLOBAL is not
 501                                  * set)
 502                                  */
 503                                 if (sk->af ==
 504                                     (*state)->key[PF_SK_WIRE]->af &&
 505                                     (((*state)->direction == PF_OUT &&
 506                                     PF_AEQ(&(*state)->src_node->addr,
 507                                         &sk->addr[0], sk->af)) ||
 508                                     ((*state)->direction == PF_IN &&
 509                                     PF_AEQ(&(*state)->src_node->addr,
 510                                         &sk->addr[1], sk->af))) &&
 511                                     ((*state)->rule.ptr->flush &
 512                                     PF_FLUSH_GLOBAL ||
 513                                     (*state)->rule.ptr == st->rule.ptr)) {
 514                                         st->timeout = PFTM_PURGE;
 515                                         st->src.state = st->dst.state =
 516                                             TCPS_CLOSED;
 517                                         killed++;
 518                                 }
 519                         }
 520                         if (pf_status.debug >= PF_DEBUG_MISC)
 521                                 kprintf(", %u states killed", killed);
 522                 }
 523                 if (pf_status.debug >= PF_DEBUG_MISC)
 524                         kprintf("\n");
 525         }
 526
 527         /* kill this state */
 528         (*state)->timeout = PFTM_PURGE;
 529         (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
 530         return (1);
 531 }
 532
 533 int
 534 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 535     struct pf_addr *src, sa_family_t af)
 536 {
 537         struct pf_src_node      k;
 538
 539         if (*sn == NULL) {
 540                 k.af = af;
 541                 PF_ACPY(&k.addr, src, af);
 542                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 543                     rule->rpool.opts & PF_POOL_STICKYADDR)
 544                         k.rule.ptr = rule;
 545                 else
 546                         k.rule.ptr = NULL;
 547                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
 548                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
 549         }
 550         if (*sn == NULL) {
 551                 if (!rule->max_src_nodes ||
 552                     rule->src_nodes < rule->max_src_nodes)
 553                         (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT | PR_ZERO);
 554                 else
 555                         pf_status.lcounters[LCNT_SRCNODES]++;
 556                 if ((*sn) == NULL)
 557                         return (-1);
 558
 559                 pf_init_threshold(&(*sn)->conn_rate,
 560                     rule->max_src_conn_rate.limit,
 561                     rule->max_src_conn_rate.seconds);
 562
 563                 (*sn)->af = af;
 564                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 565                     rule->rpool.opts & PF_POOL_STICKYADDR)
 566                         (*sn)->rule.ptr = rule;
 567                 else
 568                         (*sn)->rule.ptr = NULL;
 569                 PF_ACPY(&(*sn)->addr, src, af);
 570                 if (RB_INSERT(pf_src_tree,
 571                     &tree_src_tracking, *sn) != NULL) {
 572                         if (pf_status.debug >= PF_DEBUG_MISC) {
 573                                 kprintf("pf: src_tree insert failed: ");
 574                                 pf_print_host(&(*sn)->addr, 0, af);
 575                                 kprintf("\n");
 576                         }
 577                         pool_put(&pf_src_tree_pl, *sn);
 578                         return (-1);
 579                 }
 580                 (*sn)->creation = time_second;
 581                 (*sn)->ruletype = rule->action;
 582                 if ((*sn)->rule.ptr != NULL)
 583                         (*sn)->rule.ptr->src_nodes++;
 584                 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
 585                 pf_status.src_nodes++;
 586         } else {
 587                 if (rule->max_src_states &&
 588                     (*sn)->states >= rule->max_src_states) {
 589                         pf_status.lcounters[LCNT_SRCSTATES]++;
 590                         return (-1);
 591                 }
 592         }
 593         return (0);
 594 }
 595
 596 /* state table stuff */
 597
 598 static __inline int
 599 pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b)
 600 {
 601         int     diff;
 602
 603         if ((diff = a->proto - b->proto) != 0)
 604                 return (diff);
 605         if ((diff = a->af - b->af) != 0)
 606                 return (diff);
 607         switch (a->af) {
 608 #ifdef INET
 609         case AF_INET:
 610                 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
 611                         return (1);
 612                 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
 613                         return (-1);
 614                 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
 615                         return (1);
 616                 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
 617                         return (-1);
 618                 break;
 619 #endif /* INET */
 620 #ifdef INET6
 621         case AF_INET6:
 622                 if (a->addr[0].addr32[3] > b->addr[0].addr32[3])
 623                         return (1);
 624                 if (a->addr[0].addr32[3] < b->addr[0].addr32[3])
 625                         return (-1);
 626                 if (a->addr[1].addr32[3] > b->addr[1].addr32[3])
 627                         return (1);
 628                 if (a->addr[1].addr32[3] < b->addr[1].addr32[3])
 629                         return (-1);
 630                 if (a->addr[0].addr32[2] > b->addr[0].addr32[2])
 631                         return (1);
 632                 if (a->addr[0].addr32[2] < b->addr[0].addr32[2])
 633                         return (-1);
 634                 if (a->addr[1].addr32[2] > b->addr[1].addr32[2])
 635                         return (1);
 636                 if (a->addr[1].addr32[2] < b->addr[1].addr32[2])
 637                         return (-1);
 638                 if (a->addr[0].addr32[1] > b->addr[0].addr32[1])
 639                         return (1);
 640                 if (a->addr[0].addr32[1] < b->addr[0].addr32[1])
 641                         return (-1);
 642                 if (a->addr[1].addr32[1] > b->addr[1].addr32[1])
 643                         return (1);
 644                 if (a->addr[1].addr32[1] < b->addr[1].addr32[1])
 645                         return (-1);
 646                 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
 647                         return (1);
 648                 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
 649                         return (-1);
 650                 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
 651                         return (1);
 652                 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
 653                         return (-1);
 654                 break;
 655 #endif /* INET6 */
 656         }
 657
 658         if ((diff = a->port[0] - b->port[0]) != 0)
 659                 return (diff);
 660         if ((diff = a->port[1] - b->port[1]) != 0)
 661                 return (diff);
 662
 663         return (0);
 664 }
 665
 666 static __inline int
 667 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
 668 {
 669         if (a->id > b->id)
 670                 return (1);
 671         if (a->id < b->id)
 672                 return (-1);
 673         if (a->creatorid > b->creatorid)
 674                 return (1);
 675         if (a->creatorid < b->creatorid)
 676                 return (-1);
 677
 678         return (0);
 679 }
 680
 681 int
 682 pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx)
 683 {
 684         struct pf_state_item    *si;
 685         struct pf_state_key     *cur;
 686
 687         KKASSERT(s->key[idx] == NULL);  /* XXX handle this? */
 688
 689         if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl, sk)) != NULL) {
 690                 /* key exists. check for same kif, if none, add to key */
 691                 TAILQ_FOREACH(si, &cur->states, entry)
 692                         if (si->s->kif == s->kif &&
 693                             si->s->direction == s->direction) {
 694                                 if (pf_status.debug >= PF_DEBUG_MISC) {
 695                                         kprintf(
 696                                             "pf: %s key attach failed on %s: ",
 697                                             (idx == PF_SK_WIRE) ?
 698                                             "wire" : "stack",
 699                                             s->kif->pfik_name);
 700                                         pf_print_state_parts(s,
 701                                             (idx == PF_SK_WIRE) ? sk : NULL,
 702                                             (idx == PF_SK_STACK) ? sk : NULL);
 703                                         kprintf("\n");
 704                                 }
 705                                 pool_put(&pf_state_key_pl, sk);
 706                                 return (-1);    /* collision! */
 707                         }
 708                 pool_put(&pf_state_key_pl, sk);
 709                 s->key[idx] = cur;
 710         } else
 711                 s->key[idx] = sk;
 712
 713         if ((si = pool_get(&pf_state_item_pl, PR_NOWAIT)) == NULL) {
 714                 pf_state_key_detach(s, idx);
 715                 return (-1);
 716         }
 717         si->s = s;
 718
 719         /* list is sorted, if-bound states before floating */
 720         if (s->kif == pfi_all)
 721                 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry);
 722         else
 723                 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry);
 724         return (0);
 725 }
 726
 727 void
 728 pf_detach_state(struct pf_state *s)
 729 {
 730         if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK])
 731                 s->key[PF_SK_WIRE] = NULL;
 732
 733         if (s->key[PF_SK_STACK] != NULL)
 734                 pf_state_key_detach(s, PF_SK_STACK);
 735
 736         if (s->key[PF_SK_WIRE] != NULL)
 737                 pf_state_key_detach(s, PF_SK_WIRE);
 738 }
 739
 740 void
 741 pf_state_key_detach(struct pf_state *s, int idx)
 742 {
 743         struct pf_state_item    *si;
 744
 745         si = TAILQ_FIRST(&s->key[idx]->states);
 746         while (si && si->s != s)
 747             si = TAILQ_NEXT(si, entry);
 748
 749         if (si) {
 750                 TAILQ_REMOVE(&s->key[idx]->states, si, entry);
 751                 pool_put(&pf_state_item_pl, si);
 752         }
 753
 754         if (TAILQ_EMPTY(&s->key[idx]->states)) {
 755                 RB_REMOVE(pf_state_tree, &pf_statetbl, s->key[idx]);
 756                 if (s->key[idx]->reverse)
 757                         s->key[idx]->reverse->reverse = NULL;
 758                 if (s->key[idx]->inp)
 759                         s->key[idx]->inp->inp_pf_sk = NULL;
 760                 pool_put(&pf_state_key_pl, s->key[idx]);
 761         }
 762         s->key[idx] = NULL;
 763 }
 764
 765 struct pf_state_key *
 766 pf_alloc_state_key(int pool_flags)
 767 {
 768         struct pf_state_key     *sk;
 769
 770         if ((sk = pool_get(&pf_state_key_pl, pool_flags)) == NULL)
 771                 return (NULL);
 772         TAILQ_INIT(&sk->states);
 773
 774         return (sk);
 775 }
 776
 777 int
 778 pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr,
 779         struct pf_state_key **skw, struct pf_state_key **sks,
 780         struct pf_state_key **skp, struct pf_state_key **nkp,
 781         struct pf_addr *saddr, struct pf_addr *daddr,
 782         u_int16_t sport, u_int16_t dport)
 783 {
 784         KKASSERT((*skp == NULL && *nkp == NULL));
 785
 786         if ((*skp = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL)
 787                 return (ENOMEM);
 788
 789         PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af);
 790         PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af);
 791         (*skp)->port[pd->sidx] = sport;
 792         (*skp)->port[pd->didx] = dport;
 793         (*skp)->proto = pd->proto;
 794         (*skp)->af = pd->af;
 795
 796         if (nr != NULL) {
 797                 if ((*nkp = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL)
 798                         return (ENOMEM); /* caller must handle cleanup */
 799
 800                 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */
 801                 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af);
 802                 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af);
 803                 (*nkp)->port[0] = (*skp)->port[0];
 804                 (*nkp)->port[1] = (*skp)->port[1];
 805                 (*nkp)->proto = pd->proto;
 806                 (*nkp)->af = pd->af;
 807         } else
 808                 *nkp = *skp;
 809
 810         if (pd->dir == PF_IN) {
 811                 *skw = *skp;
 812                 *sks = *nkp;
 813         } else {
 814                 *sks = *skp;
 815                 *skw = *nkp;
 816         }
 817         return (0);
 818 }
 819
 820
 821 int
 822 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
 823     struct pf_state_key *sks, struct pf_state *s)
 824 {
 825         s->kif = kif;
 826
 827         if (skw == sks) {
 828                 if (pf_state_key_attach(skw, s, PF_SK_WIRE))
 829                         return (-1);
 830                 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
 831         } else {
 832                 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) {
 833                         pool_put(&pf_state_key_pl, sks);
 834                         return (-1);
 835                 }
 836                 if (pf_state_key_attach(sks, s, PF_SK_STACK)) {
 837                         pf_state_key_detach(s, PF_SK_WIRE);
 838                         return (-1);
 839                 }
 840         }
 841
 842         if (s->id == 0 && s->creatorid == 0) {
 843                 s->id = htobe64(pf_status.stateid++);
 844                 s->creatorid = pf_status.hostid;
 845         }
 846         if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) {
 847                 if (pf_status.debug >= PF_DEBUG_MISC) {
 848                         kprintf("pf: state insert failed: "
 849                             "id: %016jx creatorid: %08x",
 850                               (uintmax_t)be64toh(s->id), ntohl(s->creatorid));
 851                         if (s->sync_flags & PFSTATE_FROMSYNC)
 852                                 kprintf(" (from sync)");
 853                         kprintf("\n");
 854                 }
 855                 pf_detach_state(s);
 856                 return (-1);
 857         }
 858         TAILQ_INSERT_TAIL(&state_list, s, entry_list);
 859         pf_status.fcounters[FCNT_STATE_INSERT]++;
 860         pf_status.states++;
 861         pfi_kif_ref(kif, PFI_KIF_REF_STATE);
 862         pfsync_insert_state(s);
 863         return (0);
 864 }
 865
 866 struct pf_state *
 867 pf_find_state_byid(struct pf_state_cmp *key)
 868 {
 869         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 870
 871         return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
 872 }
 873
 874 struct pf_state *
 875 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir,
 876     struct mbuf *m)
 877 {
 878         struct pf_state_key     *sk;
 879         struct pf_state_item    *si;
 880
 881         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 882
 883         if (dir == PF_OUT && m->m_pkthdr.pf.statekey &&
 884             ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse)
 885                 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse;
 886         else {
 887                 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl,
 888                     (struct pf_state_key *)key)) == NULL)
 889                         return (NULL);
 890                 if (dir == PF_OUT && m->m_pkthdr.pf.statekey) {
 891                         ((struct pf_state_key *)
 892                             m->m_pkthdr.pf.statekey)->reverse = sk;
 893                         sk->reverse = m->m_pkthdr.pf.statekey;
 894                 }
 895         }
 896
 897         if (dir == PF_OUT)
 898                 m->m_pkthdr.pf.statekey = NULL;
 899
 900         /* list is sorted, if-bound states before floating ones */
 901         TAILQ_FOREACH(si, &sk->states, entry)
 902                 if ((si->s->kif == pfi_all || si->s->kif == kif) &&
 903                     sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
 904                     si->s->key[PF_SK_STACK]))
 905                         return (si->s);
 906
 907         return (NULL);
 908 }
 909
 910 struct pf_state *
 911 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
 912 {
 913         struct pf_state_key     *sk;
 914         struct pf_state_item    *si, *ret = NULL;
 915
 916         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 917
 918         sk = RB_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key);
 919
 920         if (sk != NULL) {
 921                 TAILQ_FOREACH(si, &sk->states, entry)
 922                         if (dir == PF_INOUT ||
 923                             (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
 924                             si->s->key[PF_SK_STACK]))) {
 925                                 if (more == NULL)
 926                                         return (si->s);
 927
 928                                 if (ret)
 929                                         (*more)++;
 930                                 else
 931                                         ret = si;
 932                         }
 933         }
 934         return (ret ? ret->s : NULL);
 935 }
 936
 937 /* END state table stuff */
 938
 939
 940 void
 941 pf_purge_thread(void *v)
 942 {
 943         int nloops = 0;
 944         int locked = 0;
 945
 946         lwkt_gettoken(&pf_token);
 947         for (;;) {
 948                 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz);
 949
 950                 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
 951
 952                 if (pf_end_threads) {
 953                         pf_purge_expired_states(pf_status.states, 1);
 954                         pf_purge_expired_fragments();
 955                         pf_purge_expired_src_nodes(1);
 956                         pf_end_threads++;
 957
 958                         lockmgr(&pf_consistency_lock, LK_RELEASE);
 959                         wakeup(pf_purge_thread);
 960                         kthread_exit();
 961                 }
 962                 crit_enter();
 963
 964                 /* process a fraction of the state table every second */
 965                 if(!pf_purge_expired_states(1 + (pf_status.states
 966                     / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) {
 967
 968                         pf_purge_expired_states(1 + (pf_status.states
 969                             / pf_default_rule.timeout[PFTM_INTERVAL]), 1);
 970                 }
 971
 972                 /* purge other expired types every PFTM_INTERVAL seconds */
 973                 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
 974                         pf_purge_expired_fragments();
 975                         if (!pf_purge_expired_src_nodes(locked)) {
 976                                 pf_purge_expired_src_nodes(1);
 977                         }
 978                         nloops = 0;
 979                 }
 980                 crit_exit();
 981                 lockmgr(&pf_consistency_lock, LK_RELEASE);
 982         }
 983         lwkt_reltoken(&pf_token);
 984 }
 985
 986 u_int32_t
 987 pf_state_expires(const struct pf_state *state)
 988 {
 989         u_int32_t       timeout;
 990         u_int32_t       start;
 991         u_int32_t       end;
 992         u_int32_t       states;
 993
 994         /* handle all PFTM_* > PFTM_MAX here */
 995         if (state->timeout == PFTM_PURGE)
 996                 return (time_second);
 997         if (state->timeout == PFTM_UNTIL_PACKET)
 998                 return (0);
 999         KKASSERT(state->timeout != PFTM_UNLINKED);
1000         KKASSERT(state->timeout < PFTM_MAX);
1001         timeout = state->rule.ptr->timeout[state->timeout];
1002         if (!timeout)
1003                 timeout = pf_default_rule.timeout[state->timeout];
1004         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1005         if (start) {
1006                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1007                 states = state->rule.ptr->states_cur;
1008         } else {
1009                 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1010                 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1011                 states = pf_status.states;
1012         }
1013         if (end && states > start && start < end) {
1014                 if (states < end)
1015                         return (state->expire + timeout * (end - states) /
1016                             (end - start));
1017                 else
1018                         return (time_second);
1019         }
1020         return (state->expire + timeout);
1021 }
1022
1023 int
1024 pf_purge_expired_src_nodes(int waslocked)
1025 {
1026          struct pf_src_node             *cur, *next;
1027          int                             locked = waslocked;
1028
1029          for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
1030                  next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
1031
1032                  if (cur->states <= 0 && cur->expire <= time_second) {
1033                          if (! locked) {
1034                                  lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1035                                  next = RB_NEXT(pf_src_tree,
1036                                      &tree_src_tracking, cur);
1037                                  locked = 1;
1038                          }
1039                          if (cur->rule.ptr != NULL) {
1040                                  cur->rule.ptr->src_nodes--;
1041                                  if (cur->rule.ptr->states_cur <= 0 &&
1042                                      cur->rule.ptr->max_src_nodes <= 0)
1043                                          pf_rm_rule(NULL, cur->rule.ptr);
1044                          }
1045                          RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
1046                          pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
1047                          pf_status.src_nodes--;
1048                          pool_put(&pf_src_tree_pl, cur);
1049                  }
1050          }
1051
1052          if (locked && !waslocked)
1053                 lockmgr(&pf_consistency_lock, LK_RELEASE);
1054         return(1);
1055 }
1056
1057 void
1058 pf_src_tree_remove_state(struct pf_state *s)
1059 {
1060         u_int32_t timeout;
1061
1062         if (s->src_node != NULL) {
1063                 if (s->src.tcp_est)
1064                         --s->src_node->conn;
1065                 if (--s->src_node->states <= 0) {
1066                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1067                         if (!timeout)
1068                                 timeout =
1069                                     pf_default_rule.timeout[PFTM_SRC_NODE];
1070                         s->src_node->expire = time_second + timeout;
1071                 }
1072         }
1073         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1074                 if (--s->nat_src_node->states <= 0) {
1075                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1076                         if (!timeout)
1077                                 timeout =
1078                                     pf_default_rule.timeout[PFTM_SRC_NODE];
1079                         s->nat_src_node->expire = time_second + timeout;
1080                 }
1081         }
1082         s->src_node = s->nat_src_node = NULL;
1083 }
1084
1085 /* callers should be at crit_enter() */
1086 void
1087 pf_unlink_state(struct pf_state *cur)
1088 {
1089         if (cur->src.state == PF_TCPS_PROXY_DST) {
1090                 /* XXX wire key the right one? */
1091                 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af,
1092                     &cur->key[PF_SK_WIRE]->addr[1],
1093                     &cur->key[PF_SK_WIRE]->addr[0],
1094                     cur->key[PF_SK_WIRE]->port[1],
1095                     cur->key[PF_SK_WIRE]->port[0],
1096                     cur->src.seqhi, cur->src.seqlo + 1,
1097                     TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
1098         }
1099         RB_REMOVE(pf_state_tree_id, &tree_id, cur);
1100         if (cur->creatorid == pf_status.hostid)
1101                 pfsync_delete_state(cur);
1102         cur->timeout = PFTM_UNLINKED;
1103         pf_src_tree_remove_state(cur);
1104         pf_detach_state(cur);
1105 }
1106
1107 static struct pf_state  *purge_cur;
1108
1109 /* callers should be at crit_enter() and hold the
1110  * write_lock on pf_consistency_lock */
1111 void
1112 pf_free_state(struct pf_state *cur)
1113 {
1114         if (pfsyncif != NULL &&
1115             (pfsyncif->sc_bulk_send_next == cur ||
1116             pfsyncif->sc_bulk_terminator == cur))
1117                 return;
1118         KKASSERT(cur->timeout == PFTM_UNLINKED);
1119         if (--cur->rule.ptr->states_cur <= 0 &&
1120             cur->rule.ptr->src_nodes <= 0)
1121                 pf_rm_rule(NULL, cur->rule.ptr);
1122         if (cur->nat_rule.ptr != NULL)
1123                 if (--cur->nat_rule.ptr->states_cur <= 0 &&
1124                         cur->nat_rule.ptr->src_nodes <= 0)
1125                         pf_rm_rule(NULL, cur->nat_rule.ptr);
1126         if (cur->anchor.ptr != NULL)
1127                 if (--cur->anchor.ptr->states_cur <= 0)
1128                         pf_rm_rule(NULL, cur->anchor.ptr);
1129         pf_normalize_tcp_cleanup(cur);
1130         pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE);
1131
1132         /*
1133          * We may be freeing pf_purge_expired_states()'s saved scan entry,
1134          * adjust it if necessary.
1135          */
1136         if (purge_cur == cur) {
1137                 kprintf("PURGE CONFLICT\n");
1138                 purge_cur = TAILQ_NEXT(purge_cur, entry_list);
1139         }
1140         TAILQ_REMOVE(&state_list, cur, entry_list);
1141         if (cur->tag)
1142                 pf_tag_unref(cur->tag);
1143         pool_put(&pf_state_pl, cur);
1144         pf_status.fcounters[FCNT_STATE_REMOVALS]++;
1145         pf_status.states--;
1146 }
1147
1148 int
1149 pf_purge_expired_states(u_int32_t maxcheck, int waslocked)
1150 {
1151         struct pf_state         *cur;
1152         int                      locked = waslocked;
1153
1154         while (maxcheck--) {
1155                 /*
1156                  * Wrap to start of list when we hit the end
1157                  */
1158                 cur = purge_cur;
1159                 if (cur == NULL) {
1160                         cur = TAILQ_FIRST(&state_list);
1161                         if (cur == NULL)
1162                                 break;  /* list empty */
1163                 }
1164
1165                 /*
1166                  * Setup next (purge_cur) while we process this one.  If we block and
1167                  * something else deletes purge_cur, pf_free_state() will adjust it further
1168                  * ahead.
1169                  */
1170                 purge_cur = TAILQ_NEXT(cur, entry_list);
1171
1172                 if (cur->timeout == PFTM_UNLINKED) {
1173                         /* free unlinked state */
1174                         if (! locked) {
1175                                 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1176                                 locked = 1;
1177                         }
1178                         pf_free_state(cur);
1179                 } else if (pf_state_expires(cur) <= time_second) {
1180                         /* unlink and free expired state */
1181                         pf_unlink_state(cur);
1182                         if (! locked) {
1183                                 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE))
1184                                         return (0);
1185                                 locked = 1;
1186                         }
1187                         pf_free_state(cur);
1188                 }
1189         }
1190
1191         if (locked)
1192                 lockmgr(&pf_consistency_lock, LK_RELEASE);
1193         return (1);
1194 }
1195
1196 int
1197 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
1198 {
1199         if (aw->type != PF_ADDR_TABLE)
1200                 return (0);
1201         if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
1202                 return (1);
1203         return (0);
1204 }
1205
1206 void
1207 pf_tbladdr_remove(struct pf_addr_wrap *aw)
1208 {
1209         if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
1210                 return;
1211         pfr_detach_table(aw->p.tbl);
1212         aw->p.tbl = NULL;
1213 }
1214
1215 void
1216 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
1217 {
1218         struct pfr_ktable *kt = aw->p.tbl;
1219
1220         if (aw->type != PF_ADDR_TABLE || kt == NULL)
1221                 return;
1222         if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
1223                 kt = kt->pfrkt_root;
1224         aw->p.tbl = NULL;
1225         aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
1226                 kt->pfrkt_cnt : -1;
1227 }
1228
1229 void
1230 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1231 {
1232         switch (af) {
1233 #ifdef INET
1234         case AF_INET: {
1235                 u_int32_t a = ntohl(addr->addr32[0]);
1236                 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1237                     (a>>8)&255, a&255);
1238                 if (p) {
1239                         p = ntohs(p);
1240                         kprintf(":%u", p);
1241                 }
1242                 break;
1243         }
1244 #endif /* INET */
1245 #ifdef INET6
1246         case AF_INET6: {
1247                 u_int16_t b;
1248                 u_int8_t i, curstart = 255, curend = 0,
1249                     maxstart = 0, maxend = 0;
1250                 for (i = 0; i < 8; i++) {
1251                         if (!addr->addr16[i]) {
1252                                 if (curstart == 255)
1253                                         curstart = i;
1254                                 else
1255                                         curend = i;
1256                         } else {
1257                                 if (curstart) {
1258                                         if ((curend - curstart) >
1259                                             (maxend - maxstart)) {
1260                                                 maxstart = curstart;
1261                                                 maxend = curend;
1262                                                 curstart = 255;
1263                                         }
1264                                 }
1265                         }
1266                 }
1267                 for (i = 0; i < 8; i++) {
1268                         if (i >= maxstart && i <= maxend) {
1269                                 if (maxend != 7) {
1270                                         if (i == maxstart)
1271                                                 kprintf(":");
1272                                 } else {
1273                                         if (i == maxend)
1274                                                 kprintf(":");
1275                                 }
1276                         } else {
1277                                 b = ntohs(addr->addr16[i]);
1278                                 kprintf("%x", b);
1279                                 if (i < 7)
1280                                         kprintf(":");
1281                         }
1282                 }
1283                 if (p) {
1284                         p = ntohs(p);
1285                         kprintf("[%u]", p);
1286                 }
1287                 break;
1288         }
1289 #endif /* INET6 */
1290         }
1291 }
1292
1293 void
1294 pf_print_state(struct pf_state *s)
1295 {
1296         pf_print_state_parts(s, NULL, NULL);
1297 }
1298
1299 void
1300 pf_print_state_parts(struct pf_state *s,
1301     struct pf_state_key *skwp, struct pf_state_key *sksp)
1302 {
1303         struct pf_state_key *skw, *sks;
1304         u_int8_t proto, dir;
1305
1306         /* Do our best to fill these, but they're skipped if NULL */
1307         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1308         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1309         proto = skw ? skw->proto : (sks ? sks->proto : 0);
1310         dir = s ? s->direction : 0;
1311
1312         switch (proto) {
1313         case IPPROTO_TCP:
1314                 kprintf("TCP ");
1315                 break;
1316         case IPPROTO_UDP:
1317                 kprintf("UDP ");
1318                 break;
1319         case IPPROTO_ICMP:
1320                 kprintf("ICMP ");
1321                 break;
1322         case IPPROTO_ICMPV6:
1323                 kprintf("ICMPV6 ");
1324                 break;
1325         default:
1326                 kprintf("%u ", skw->proto);
1327                 break;
1328         }
1329         switch (dir) {
1330         case PF_IN:
1331                 kprintf(" in");
1332                 break;
1333         case PF_OUT:
1334                 kprintf(" out");
1335                 break;
1336         }
1337         if (skw) {
1338                 kprintf(" wire: ");
1339                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1340                 kprintf(" ");
1341                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1342         }
1343         if (sks) {
1344                 kprintf(" stack: ");
1345                 if (sks != skw) {
1346                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1347                         kprintf(" ");
1348                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1349                 } else
1350                         kprintf("-");
1351         }
1352         if (s) {
1353                 if (proto == IPPROTO_TCP) {
1354                         kprintf(" [lo=%u high=%u win=%u modulator=%u",
1355                             s->src.seqlo, s->src.seqhi,
1356                             s->src.max_win, s->src.seqdiff);
1357                         if (s->src.wscale && s->dst.wscale)
1358                                 kprintf(" wscale=%u",
1359                                     s->src.wscale & PF_WSCALE_MASK);
1360                         kprintf("]");
1361                         kprintf(" [lo=%u high=%u win=%u modulator=%u",
1362                             s->dst.seqlo, s->dst.seqhi,
1363                             s->dst.max_win, s->dst.seqdiff);
1364                         if (s->src.wscale && s->dst.wscale)
1365                                 kprintf(" wscale=%u",
1366                                 s->dst.wscale & PF_WSCALE_MASK);
1367                         kprintf("]");
1368                 }
1369                 kprintf(" %u:%u", s->src.state, s->dst.state);
1370         }
1371 }
1372
1373 void
1374 pf_print_flags(u_int8_t f)
1375 {
1376         if (f)
1377                 kprintf(" ");
1378         if (f & TH_FIN)
1379                 kprintf("F");
1380         if (f & TH_SYN)
1381                 kprintf("S");
1382         if (f & TH_RST)
1383                 kprintf("R");
1384         if (f & TH_PUSH)
1385                 kprintf("P");
1386         if (f & TH_ACK)
1387                 kprintf("A");
1388         if (f & TH_URG)
1389                 kprintf("U");
1390         if (f & TH_ECE)
1391                 kprintf("E");
1392         if (f & TH_CWR)
1393                 kprintf("W");
1394 }
1395
1396 #define PF_SET_SKIP_STEPS(i)                                    \
1397         do {                                                    \
1398                 while (head[i] != cur) {                        \
1399                         head[i]->skip[i].ptr = cur;             \
1400                         head[i] = TAILQ_NEXT(head[i], entries); \
1401                 }                                               \
1402         } while (0)
1403
1404 void
1405 pf_calc_skip_steps(struct pf_rulequeue *rules)
1406 {
1407         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1408         int i;
1409
1410         cur = TAILQ_FIRST(rules);
1411         prev = cur;
1412         for (i = 0; i < PF_SKIP_COUNT; ++i)
1413                 head[i] = cur;
1414         while (cur != NULL) {
1415
1416                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1417                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1418                 if (cur->direction != prev->direction)
1419                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1420                 if (cur->af != prev->af)
1421                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
1422                 if (cur->proto != prev->proto)
1423                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1424                 if (cur->src.neg != prev->src.neg ||
1425                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1426                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1427                 if (cur->src.port[0] != prev->src.port[0] ||
1428                     cur->src.port[1] != prev->src.port[1] ||
1429                     cur->src.port_op != prev->src.port_op)
1430                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1431                 if (cur->dst.neg != prev->dst.neg ||
1432                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1433                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1434                 if (cur->dst.port[0] != prev->dst.port[0] ||
1435                     cur->dst.port[1] != prev->dst.port[1] ||
1436                     cur->dst.port_op != prev->dst.port_op)
1437                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1438
1439                 prev = cur;
1440                 cur = TAILQ_NEXT(cur, entries);
1441         }
1442         for (i = 0; i < PF_SKIP_COUNT; ++i)
1443                 PF_SET_SKIP_STEPS(i);
1444 }
1445
1446 int
1447 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1448 {
1449         if (aw1->type != aw2->type)
1450                 return (1);
1451         switch (aw1->type) {
1452         case PF_ADDR_ADDRMASK:
1453         case PF_ADDR_RANGE:
1454                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1455                         return (1);
1456                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1457                         return (1);
1458                 return (0);
1459         case PF_ADDR_DYNIFTL:
1460                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1461         case PF_ADDR_NOROUTE:
1462         case PF_ADDR_URPFFAILED:
1463                 return (0);
1464         case PF_ADDR_TABLE:
1465                 return (aw1->p.tbl != aw2->p.tbl);
1466         case PF_ADDR_RTLABEL:
1467                 return (aw1->v.rtlabel != aw2->v.rtlabel);
1468         default:
1469                 kprintf("invalid address type: %d\n", aw1->type);
1470                 return (1);
1471         }
1472 }
1473
1474 u_int16_t
1475 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1476 {
1477         u_int32_t       l;
1478
1479         if (udp && !cksum)
1480                 return (0x0000);
1481         l = cksum + old - new;
1482         l = (l >> 16) + (l & 65535);
1483         l = l & 65535;
1484         if (udp && !l)
1485                 return (0xFFFF);
1486         return (l);
1487 }
1488
1489 void
1490 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1491     struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1492 {
1493         struct pf_addr  ao;
1494         u_int16_t       po = *p;
1495
1496         PF_ACPY(&ao, a, af);
1497         PF_ACPY(a, an, af);
1498
1499         *p = pn;
1500
1501         switch (af) {
1502 #ifdef INET
1503         case AF_INET:
1504                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1505                     ao.addr16[0], an->addr16[0], 0),
1506                     ao.addr16[1], an->addr16[1], 0);
1507                 *p = pn;
1508                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1509                     ao.addr16[0], an->addr16[0], u),
1510                     ao.addr16[1], an->addr16[1], u),
1511                     po, pn, u);
1512                 break;
1513 #endif /* INET */
1514 #ifdef INET6
1515         case AF_INET6:
1516                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1517                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1518                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1519                     ao.addr16[0], an->addr16[0], u),
1520                     ao.addr16[1], an->addr16[1], u),
1521                     ao.addr16[2], an->addr16[2], u),
1522                     ao.addr16[3], an->addr16[3], u),
1523                     ao.addr16[4], an->addr16[4], u),
1524                     ao.addr16[5], an->addr16[5], u),
1525                     ao.addr16[6], an->addr16[6], u),
1526                     ao.addr16[7], an->addr16[7], u),
1527                     po, pn, u);
1528                 break;
1529 #endif /* INET6 */
1530         }
1531 }
1532
1533
1534 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
1535 void
1536 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1537 {
1538         u_int32_t       ao;
1539
1540         memcpy(&ao, a, sizeof(ao));
1541         memcpy(a, &an, sizeof(u_int32_t));
1542         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1543             ao % 65536, an % 65536, u);
1544 }
1545
1546 #ifdef INET6
1547 void
1548 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1549 {
1550         struct pf_addr  ao;
1551
1552         PF_ACPY(&ao, a, AF_INET6);
1553         PF_ACPY(a, an, AF_INET6);
1554
1555         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1556             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1557             pf_cksum_fixup(pf_cksum_fixup(*c,
1558             ao.addr16[0], an->addr16[0], u),
1559             ao.addr16[1], an->addr16[1], u),
1560             ao.addr16[2], an->addr16[2], u),
1561             ao.addr16[3], an->addr16[3], u),
1562             ao.addr16[4], an->addr16[4], u),
1563             ao.addr16[5], an->addr16[5], u),
1564             ao.addr16[6], an->addr16[6], u),
1565             ao.addr16[7], an->addr16[7], u);
1566 }
1567 #endif /* INET6 */
1568
1569 void
1570 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1571     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1572     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1573 {
1574         struct pf_addr  oia, ooa;
1575
1576         PF_ACPY(&oia, ia, af);
1577         if (oa)
1578                 PF_ACPY(&ooa, oa, af);
1579
1580         /* Change inner protocol port, fix inner protocol checksum. */
1581         if (ip != NULL) {
1582                 u_int16_t       oip = *ip;
1583                 u_int32_t       opc = 0;
1584
1585                 if (pc != NULL)
1586                         opc = *pc;
1587                 *ip = np;
1588                 if (pc != NULL)
1589                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1590                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1591                 if (pc != NULL)
1592                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1593         }
1594         /* Change inner ip address, fix inner ip and icmp checksums. */
1595         PF_ACPY(ia, na, af);
1596         switch (af) {
1597 #ifdef INET
1598         case AF_INET: {
1599                 u_int32_t        oh2c = *h2c;
1600
1601                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1602                     oia.addr16[0], ia->addr16[0], 0),
1603                     oia.addr16[1], ia->addr16[1], 0);
1604                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1605                     oia.addr16[0], ia->addr16[0], 0),
1606                     oia.addr16[1], ia->addr16[1], 0);
1607                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1608                 break;
1609         }
1610 #endif /* INET */
1611 #ifdef INET6
1612         case AF_INET6:
1613                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1614                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1615                     pf_cksum_fixup(pf_cksum_fixup(*ic,
1616                     oia.addr16[0], ia->addr16[0], u),
1617                     oia.addr16[1], ia->addr16[1], u),
1618                     oia.addr16[2], ia->addr16[2], u),
1619                     oia.addr16[3], ia->addr16[3], u),
1620                     oia.addr16[4], ia->addr16[4], u),
1621                     oia.addr16[5], ia->addr16[5], u),
1622                     oia.addr16[6], ia->addr16[6], u),
1623                     oia.addr16[7], ia->addr16[7], u);
1624                 break;
1625 #endif /* INET6 */
1626         }
1627         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
1628         if (oa) {
1629                 PF_ACPY(oa, na, af);
1630                 switch (af) {
1631 #ifdef INET
1632                 case AF_INET:
1633                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1634                             ooa.addr16[0], oa->addr16[0], 0),
1635                             ooa.addr16[1], oa->addr16[1], 0);
1636                         break;
1637 #endif /* INET */
1638 #ifdef INET6
1639                 case AF_INET6:
1640                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1641                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1642                             pf_cksum_fixup(pf_cksum_fixup(*ic,
1643                             ooa.addr16[0], oa->addr16[0], u),
1644                             ooa.addr16[1], oa->addr16[1], u),
1645                             ooa.addr16[2], oa->addr16[2], u),
1646                             ooa.addr16[3], oa->addr16[3], u),
1647                             ooa.addr16[4], oa->addr16[4], u),
1648                             ooa.addr16[5], oa->addr16[5], u),
1649                             ooa.addr16[6], oa->addr16[6], u),
1650                             ooa.addr16[7], oa->addr16[7], u);
1651                         break;
1652 #endif /* INET6 */
1653                 }
1654         }
1655 }
1656
1657
1658 /*
1659  * Need to modulate the sequence numbers in the TCP SACK option
1660  * (credits to Krzysztof Pfaff for report and patch)
1661  */
1662 int
1663 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
1664     struct tcphdr *th, struct pf_state_peer *dst)
1665 {
1666         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
1667         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
1668         int copyback = 0, i, olen;
1669         struct raw_sackblock sack;
1670
1671 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
1672         if (hlen < TCPOLEN_SACKLEN ||
1673             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
1674                 return 0;
1675
1676         while (hlen >= TCPOLEN_SACKLEN) {
1677                 olen = opt[1];
1678                 switch (*opt) {
1679                 case TCPOPT_EOL:        /* FALLTHROUGH */
1680                 case TCPOPT_NOP:
1681                         opt++;
1682                         hlen--;
1683                         break;
1684                 case TCPOPT_SACK:
1685                         if (olen > hlen)
1686                                 olen = hlen;
1687                         if (olen >= TCPOLEN_SACKLEN) {
1688                                 for (i = 2; i + TCPOLEN_SACK <= olen;
1689                                     i += TCPOLEN_SACK) {
1690                                         memcpy(&sack, &opt[i], sizeof(sack));
1691                                         pf_change_a(&sack.rblk_start, &th->th_sum,
1692                                             htonl(ntohl(sack.rblk_start) -
1693                                             dst->seqdiff), 0);
1694                                         pf_change_a(&sack.rblk_end, &th->th_sum,
1695                                             htonl(ntohl(sack.rblk_end) -
1696                                             dst->seqdiff), 0);
1697                                         memcpy(&opt[i], &sack, sizeof(sack));
1698                                 }
1699                                 copyback = 1;
1700                         }
1701                         /* FALLTHROUGH */
1702                 default:
1703                         if (olen < 2)
1704                                 olen = 2;
1705                         hlen -= olen;
1706                         opt += olen;
1707                 }
1708         }
1709
1710         if (copyback)
1711                 m_copyback(m, off + sizeof(*th), thoptlen, opts);
1712         return (copyback);
1713 }
1714
1715 void
1716 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1717     const struct pf_addr *saddr, const struct pf_addr *daddr,
1718     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1719     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
1720     u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
1721 {
1722         struct mbuf     *m;
1723         int              len = 0, tlen;
1724 #ifdef INET
1725         struct ip       *h = NULL;
1726 #endif /* INET */
1727 #ifdef INET6
1728         struct ip6_hdr  *h6 = NULL;
1729 #endif /* INET6 */
1730         struct tcphdr   *th = NULL;
1731         char            *opt;
1732
1733         ASSERT_LWKT_TOKEN_HELD(&pf_token);
1734
1735         /* maximum segment size tcp option */
1736         tlen = sizeof(struct tcphdr);
1737         if (mss)
1738                 tlen += 4;
1739
1740         switch (af) {
1741 #ifdef INET
1742         case AF_INET:
1743                 len = sizeof(struct ip) + tlen;
1744                 break;
1745 #endif /* INET */
1746 #ifdef INET6
1747         case AF_INET6:
1748                 len = sizeof(struct ip6_hdr) + tlen;
1749                 break;
1750 #endif /* INET6 */
1751         }
1752
1753         /*
1754          * Create outgoing mbuf.
1755          *
1756          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1757          * so make sure pf.flags is clear.
1758          */
1759         m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1760         if (m == NULL) {
1761                 return;
1762         }
1763         if (tag)
1764                 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1765         m->m_pkthdr.pf.flags = 0;
1766         m->m_pkthdr.pf.tag = rtag;
1767         /* XXX Recheck when upgrading to > 4.4 */
1768         m->m_pkthdr.pf.statekey = NULL;
1769         if (r != NULL && r->rtableid >= 0)
1770                 m->m_pkthdr.pf.rtableid = r->rtableid;
1771
1772 #ifdef ALTQ
1773         if (r != NULL && r->qid) {
1774                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1775                 m->m_pkthdr.pf.qid = r->qid;
1776                 m->m_pkthdr.pf.ecn_af = af;
1777                 m->m_pkthdr.pf.hdr = mtod(m, struct ip *);
1778         }
1779 #endif /* ALTQ */
1780         m->m_data += max_linkhdr;
1781         m->m_pkthdr.len = m->m_len = len;
1782         m->m_pkthdr.rcvif = NULL;
1783         bzero(m->m_data, len);
1784         switch (af) {
1785 #ifdef INET
1786         case AF_INET:
1787                 h = mtod(m, struct ip *);
1788
1789                 /* IP header fields included in the TCP checksum */
1790                 h->ip_p = IPPROTO_TCP;
1791                 h->ip_len = tlen;
1792                 h->ip_src.s_addr = saddr->v4.s_addr;
1793                 h->ip_dst.s_addr = daddr->v4.s_addr;
1794
1795                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1796                 break;
1797 #endif /* INET */
1798 #ifdef INET6
1799         case AF_INET6:
1800                 h6 = mtod(m, struct ip6_hdr *);
1801
1802                 /* IP header fields included in the TCP checksum */
1803                 h6->ip6_nxt = IPPROTO_TCP;
1804                 h6->ip6_plen = htons(tlen);
1805                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1806                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1807
1808                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1809                 break;
1810 #endif /* INET6 */
1811         }
1812
1813         /* TCP header */
1814         th->th_sport = sport;
1815         th->th_dport = dport;
1816         th->th_seq = htonl(seq);
1817         th->th_ack = htonl(ack);
1818         th->th_off = tlen >> 2;
1819         th->th_flags = flags;
1820         th->th_win = htons(win);
1821
1822         if (mss) {
1823                 opt = (char *)(th + 1);
1824                 opt[0] = TCPOPT_MAXSEG;
1825                 opt[1] = 4;
1826                 mss = htons(mss);
1827                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1828         }
1829
1830         switch (af) {
1831 #ifdef INET
1832         case AF_INET:
1833                 /* TCP checksum */
1834                 th->th_sum = in_cksum(m, len);
1835
1836                 /* Finish the IP header */
1837                 h->ip_v = 4;
1838                 h->ip_hl = sizeof(*h) >> 2;
1839                 h->ip_tos = IPTOS_LOWDELAY;
1840                 h->ip_len = len;
1841                 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1842                 h->ip_ttl = ttl ? ttl : ip_defttl;
1843                 h->ip_sum = 0;
1844                 if (eh == NULL) {
1845                         lwkt_reltoken(&pf_token);
1846                         ip_output(m, NULL, NULL, 0, NULL, NULL);
1847                         lwkt_gettoken(&pf_token);
1848                 } else {
1849                         struct route             ro;
1850                         struct rtentry           rt;
1851                         struct ether_header     *e = (void *)ro.ro_dst.sa_data;
1852
1853                         if (ifp == NULL) {
1854                                 m_freem(m);
1855                                 return;
1856                         }
1857                         rt.rt_ifp = ifp;
1858                         ro.ro_rt = &rt;
1859                         ro.ro_dst.sa_len = sizeof(ro.ro_dst);
1860                         ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
1861                         bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
1862                         bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
1863                         e->ether_type = eh->ether_type;
1864                         /* XXX_IMPORT: later */
1865                         lwkt_reltoken(&pf_token);
1866                         ip_output(m, (void *)NULL, &ro, 0,
1867                             (void *)NULL, (void *)NULL);
1868                         lwkt_gettoken(&pf_token);
1869                 }
1870                 break;
1871 #endif /* INET */
1872 #ifdef INET6
1873         case AF_INET6:
1874                 /* TCP checksum */
1875                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1876                     sizeof(struct ip6_hdr), tlen);
1877
1878                 h6->ip6_vfc |= IPV6_VERSION;
1879                 h6->ip6_hlim = IPV6_DEFHLIM;
1880
1881                 lwkt_reltoken(&pf_token);
1882                 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
1883                 lwkt_gettoken(&pf_token);
1884                 break;
1885 #endif /* INET6 */
1886         }
1887 }
1888
1889 void
1890 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1891     struct pf_rule *r)
1892 {
1893         struct mbuf     *m0;
1894
1895         /*
1896          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1897          * so make sure pf.flags is clear.
1898          */
1899         if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL)
1900                 return;
1901
1902         m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1903         m0->m_pkthdr.pf.flags = 0;
1904         /* XXX Re-Check when Upgrading to > 4.4 */
1905         m0->m_pkthdr.pf.statekey = NULL;
1906
1907         if (r->rtableid >= 0)
1908                 m0->m_pkthdr.pf.rtableid = r->rtableid;
1909
1910 #ifdef ALTQ
1911         if (r->qid) {
1912                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1913                 m0->m_pkthdr.pf.qid = r->qid;
1914                 m0->m_pkthdr.pf.ecn_af = af;
1915                 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *);
1916         }
1917 #endif /* ALTQ */
1918
1919         switch (af) {
1920 #ifdef INET
1921         case AF_INET:
1922                 icmp_error(m0, type, code, 0, 0);
1923                 break;
1924 #endif /* INET */
1925 #ifdef INET6
1926         case AF_INET6:
1927                 icmp6_error(m0, type, code, 0);
1928                 break;
1929 #endif /* INET6 */
1930         }
1931 }
1932
1933 /*
1934  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1935  * If n is 0, they match if they are equal. If n is != 0, they match if they
1936  * are different.
1937  */
1938 int
1939 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1940     struct pf_addr *b, sa_family_t af)
1941 {
1942         int     match = 0;
1943
1944         switch (af) {
1945 #ifdef INET
1946         case AF_INET:
1947                 if ((a->addr32[0] & m->addr32[0]) ==
1948                     (b->addr32[0] & m->addr32[0]))
1949                         match++;
1950                 break;
1951 #endif /* INET */
1952 #ifdef INET6
1953         case AF_INET6:
1954                 if (((a->addr32[0] & m->addr32[0]) ==
1955                      (b->addr32[0] & m->addr32[0])) &&
1956                     ((a->addr32[1] & m->addr32[1]) ==
1957                      (b->addr32[1] & m->addr32[1])) &&
1958                     ((a->addr32[2] & m->addr32[2]) ==
1959                      (b->addr32[2] & m->addr32[2])) &&
1960                     ((a->addr32[3] & m->addr32[3]) ==
1961                      (b->addr32[3] & m->addr32[3])))
1962                         match++;
1963                 break;
1964 #endif /* INET6 */
1965         }
1966         if (match) {
1967                 if (n)
1968                         return (0);
1969                 else
1970                         return (1);
1971         } else {
1972                 if (n)
1973                         return (1);
1974                 else
1975                         return (0);
1976         }
1977 }
1978
1979 /*
1980  * Return 1 if b <= a <= e, otherwise return 0.
1981  */
1982 int
1983 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
1984     struct pf_addr *a, sa_family_t af)
1985 {
1986         switch (af) {
1987 #ifdef INET
1988         case AF_INET:
1989                 if ((a->addr32[0] < b->addr32[0]) ||
1990                     (a->addr32[0] > e->addr32[0]))
1991                         return (0);
1992                 break;
1993 #endif /* INET */
1994 #ifdef INET6
1995         case AF_INET6: {
1996                 int     i;
1997
1998                 /* check a >= b */
1999                 for (i = 0; i < 4; ++i)
2000                         if (a->addr32[i] > b->addr32[i])
2001                                 break;
2002                         else if (a->addr32[i] < b->addr32[i])
2003                                 return (0);
2004                 /* check a <= e */
2005                 for (i = 0; i < 4; ++i)
2006                         if (a->addr32[i] < e->addr32[i])
2007                                 break;
2008                         else if (a->addr32[i] > e->addr32[i])
2009                                 return (0);
2010                 break;
2011         }
2012 #endif /* INET6 */
2013         }
2014         return (1);
2015 }
2016
2017 int
2018 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2019 {
2020         switch (op) {
2021         case PF_OP_IRG:
2022                 return ((p > a1) && (p < a2));
2023         case PF_OP_XRG:
2024                 return ((p < a1) || (p > a2));
2025         case PF_OP_RRG:
2026                 return ((p >= a1) && (p <= a2));
2027         case PF_OP_EQ:
2028                 return (p == a1);
2029         case PF_OP_NE:
2030                 return (p != a1);
2031         case PF_OP_LT:
2032                 return (p < a1);
2033         case PF_OP_LE:
2034                 return (p <= a1);
2035         case PF_OP_GT:
2036                 return (p > a1);
2037         case PF_OP_GE:
2038                 return (p >= a1);
2039         }
2040         return (0); /* never reached */
2041 }
2042
2043 int
2044 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2045 {
2046         a1 = ntohs(a1);
2047         a2 = ntohs(a2);
2048         p = ntohs(p);
2049         return (pf_match(op, a1, a2, p));
2050 }
2051
2052 int
2053 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2054 {
2055         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2056                 return (0);
2057         return (pf_match(op, a1, a2, u));
2058 }
2059
2060 int
2061 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2062 {
2063         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2064                 return (0);
2065         return (pf_match(op, a1, a2, g));
2066 }
2067
2068 int
2069 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag)
2070 {
2071         if (*tag == -1)
2072                 *tag = m->m_pkthdr.pf.tag;
2073
2074         return ((!r->match_tag_not && r->match_tag == *tag) ||
2075             (r->match_tag_not && r->match_tag != *tag));
2076 }
2077
2078 int
2079 pf_tag_packet(struct mbuf *m, int tag, int rtableid)
2080 {
2081         if (tag <= 0 && rtableid < 0)
2082                 return (0);
2083
2084         if (tag > 0)
2085                 m->m_pkthdr.pf.tag = tag;
2086         if (rtableid >= 0)
2087                 m->m_pkthdr.pf.rtableid = rtableid;
2088
2089         return (0);
2090 }
2091
2092 void
2093 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
2094     struct pf_rule **r, struct pf_rule **a, int *match)
2095 {
2096         struct pf_anchor_stackframe     *f;
2097
2098         (*r)->anchor->match = 0;
2099         if (match)
2100                 *match = 0;
2101         if (*depth >= sizeof(pf_anchor_stack) /
2102             sizeof(pf_anchor_stack[0])) {
2103                 kprintf("pf_step_into_anchor: stack overflow\n");
2104                 *r = TAILQ_NEXT(*r, entries);
2105                 return;
2106         } else if (*depth == 0 && a != NULL)
2107                 *a = *r;
2108         f = pf_anchor_stack + (*depth)++;
2109         f->rs = *rs;
2110         f->r = *r;
2111         if ((*r)->anchor_wildcard) {
2112                 f->parent = &(*r)->anchor->children;
2113                 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
2114                     NULL) {
2115                         *r = NULL;
2116                         return;
2117                 }
2118                 *rs = &f->child->ruleset;
2119         } else {
2120                 f->parent = NULL;
2121                 f->child = NULL;
2122                 *rs = &(*r)->anchor->ruleset;
2123         }
2124         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2125 }
2126
2127 int
2128 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
2129     struct pf_rule **r, struct pf_rule **a, int *match)
2130 {
2131         struct pf_anchor_stackframe     *f;
2132         int quick = 0;
2133
2134         do {
2135                 if (*depth <= 0)
2136                         break;
2137                 f = pf_anchor_stack + *depth - 1;
2138                 if (f->parent != NULL && f->child != NULL) {
2139                         if (f->child->match ||
2140                             (match != NULL && *match)) {
2141                                 f->r->anchor->match = 1;
2142                                 *match = 0;
2143                         }
2144                         f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
2145                         if (f->child != NULL) {
2146                                 *rs = &f->child->ruleset;
2147                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2148                                 if (*r == NULL)
2149                                         continue;
2150                                 else
2151                                         break;
2152                         }
2153                 }
2154                 (*depth)--;
2155                 if (*depth == 0 && a != NULL)
2156                         *a = NULL;
2157                 *rs = f->rs;
2158                 if (f->r->anchor->match || (match != NULL && *match))
2159                         quick = f->r->quick;
2160                 *r = TAILQ_NEXT(f->r, entries);
2161         } while (*r == NULL);
2162
2163         return (quick);
2164 }
2165
2166 #ifdef INET6
2167 void
2168 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2169     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2170 {
2171         switch (af) {
2172 #ifdef INET
2173         case AF_INET:
2174                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2175                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2176                 break;
2177 #endif /* INET */
2178         case AF_INET6:
2179                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2180                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2181                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2182                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2183                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2184                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2185                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2186                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2187                 break;
2188         }
2189 }
2190
2191 void
2192 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2193 {
2194         switch (af) {
2195 #ifdef INET
2196         case AF_INET:
2197                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2198                 break;
2199 #endif /* INET */
2200         case AF_INET6:
2201                 if (addr->addr32[3] == 0xffffffff) {
2202                         addr->addr32[3] = 0;
2203                         if (addr->addr32[2] == 0xffffffff) {
2204                                 addr->addr32[2] = 0;
2205                                 if (addr->addr32[1] == 0xffffffff) {
2206                                         addr->addr32[1] = 0;
2207                                         addr->addr32[0] =
2208                                             htonl(ntohl(addr->addr32[0]) + 1);
2209                                 } else
2210                                         addr->addr32[1] =
2211                                             htonl(ntohl(addr->addr32[1]) + 1);
2212                         } else
2213                                 addr->addr32[2] =
2214                                     htonl(ntohl(addr->addr32[2]) + 1);
2215                 } else
2216                         addr->addr32[3] =
2217                             htonl(ntohl(addr->addr32[3]) + 1);
2218                 break;
2219         }
2220 }
2221 #endif /* INET6 */
2222
2223 #define mix(a,b,c) \
2224         do {                                    \
2225                 a -= b; a -= c; a ^= (c >> 13); \
2226                 b -= c; b -= a; b ^= (a << 8);  \
2227                 c -= a; c -= b; c ^= (b >> 13); \
2228                 a -= b; a -= c; a ^= (c >> 12); \
2229                 b -= c; b -= a; b ^= (a << 16); \
2230                 c -= a; c -= b; c ^= (b >> 5);  \
2231                 a -= b; a -= c; a ^= (c >> 3);  \
2232                 b -= c; b -= a; b ^= (a << 10); \
2233                 c -= a; c -= b; c ^= (b >> 15); \
2234         } while (0)
2235
2236 /*
2237  * hash function based on bridge_hash in if_bridge.c
2238  */
2239 void
2240 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
2241     struct pf_poolhashkey *key, sa_family_t af)
2242 {
2243         u_int32_t       a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
2244
2245         switch (af) {
2246 #ifdef INET
2247         case AF_INET:
2248                 a += inaddr->addr32[0];
2249                 b += key->key32[1];
2250                 mix(a, b, c);
2251                 hash->addr32[0] = c + key->key32[2];
2252                 break;
2253 #endif /* INET */
2254 #ifdef INET6
2255         case AF_INET6:
2256                 a += inaddr->addr32[0];
2257                 b += inaddr->addr32[2];
2258                 mix(a, b, c);
2259                 hash->addr32[0] = c;
2260                 a += inaddr->addr32[1];
2261                 b += inaddr->addr32[3];
2262                 c += key->key32[1];
2263                 mix(a, b, c);
2264                 hash->addr32[1] = c;
2265                 a += inaddr->addr32[2];
2266                 b += inaddr->addr32[1];
2267                 c += key->key32[2];
2268                 mix(a, b, c);
2269                 hash->addr32[2] = c;
2270                 a += inaddr->addr32[3];
2271                 b += inaddr->addr32[0];
2272                 c += key->key32[3];
2273                 mix(a, b, c);
2274                 hash->addr32[3] = c;
2275                 break;
2276 #endif /* INET6 */
2277         }
2278 }
2279
2280 int
2281 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
2282     struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
2283 {
2284         unsigned char            hash[16];
2285         struct pf_pool          *rpool = &r->rpool;
2286         struct pf_addr          *raddr = &rpool->cur->addr.v.a.addr;
2287         struct pf_addr          *rmask = &rpool->cur->addr.v.a.mask;
2288         struct pf_pooladdr      *acur = rpool->cur;
2289         struct pf_src_node       k;
2290
2291         if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
2292             (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2293                 k.af = af;
2294                 PF_ACPY(&k.addr, saddr, af);
2295                 if (r->rule_flag & PFRULE_RULESRCTRACK ||
2296                     r->rpool.opts & PF_POOL_STICKYADDR)
2297                         k.rule.ptr = r;
2298                 else
2299                         k.rule.ptr = NULL;
2300                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
2301                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
2302                 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
2303                         PF_ACPY(naddr, &(*sn)->raddr, af);
2304                         if (pf_status.debug >= PF_DEBUG_MISC) {
2305                                 kprintf("pf_map_addr: src tracking maps ");
2306                                 pf_print_host(&k.addr, 0, af);
2307                                 kprintf(" to ");
2308                                 pf_print_host(naddr, 0, af);
2309                                 kprintf("\n");
2310                         }
2311                         return (0);
2312                 }
2313         }
2314
2315         if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
2316                 return (1);
2317         if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2318                 switch (af) {
2319 #ifdef INET
2320                 case AF_INET:
2321                         if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
2322                             (rpool->opts & PF_POOL_TYPEMASK) !=
2323                             PF_POOL_ROUNDROBIN)
2324                                 return (1);
2325                          raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
2326                          rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
2327                         break;
2328 #endif /* INET */
2329 #ifdef INET6
2330                 case AF_INET6:
2331                         if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
2332                             (rpool->opts & PF_POOL_TYPEMASK) !=
2333                             PF_POOL_ROUNDROBIN)
2334                                 return (1);
2335                         raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
2336                         rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
2337                         break;
2338 #endif /* INET6 */
2339                 }
2340         } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2341                 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
2342                         return (1); /* unsupported */
2343         } else {
2344                 raddr = &rpool->cur->addr.v.a.addr;
2345                 rmask = &rpool->cur->addr.v.a.mask;
2346         }
2347
2348         switch (rpool->opts & PF_POOL_TYPEMASK) {
2349         case PF_POOL_NONE:
2350                 PF_ACPY(naddr, raddr, af);
2351                 break;
2352         case PF_POOL_BITMASK:
2353                 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
2354                 break;
2355         case PF_POOL_RANDOM:
2356                 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
2357                         switch (af) {
2358 #ifdef INET
2359                         case AF_INET:
2360                                 rpool->counter.addr32[0] = htonl(karc4random());
2361                                 break;
2362 #endif /* INET */
2363 #ifdef INET6
2364                         case AF_INET6:
2365                                 if (rmask->addr32[3] != 0xffffffff)
2366                                         rpool->counter.addr32[3] =
2367                                             htonl(karc4random());
2368                                 else
2369                                         break;
2370                                 if (rmask->addr32[2] != 0xffffffff)
2371                                         rpool->counter.addr32[2] =
2372                                             htonl(karc4random());
2373                                 else
2374                                         break;
2375                                 if (rmask->addr32[1] != 0xffffffff)
2376                                         rpool->counter.addr32[1] =
2377                                             htonl(karc4random());
2378                                 else
2379                                         break;
2380                                 if (rmask->addr32[0] != 0xffffffff)
2381                                         rpool->counter.addr32[0] =
2382                                             htonl(karc4random());
2383                                 break;
2384 #endif /* INET6 */
2385                         }
2386                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2387                         PF_ACPY(init_addr, naddr, af);
2388
2389                 } else {
2390                         PF_AINC(&rpool->counter, af);
2391                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2392                 }
2393                 break;
2394         case PF_POOL_SRCHASH:
2395                 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
2396                 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
2397                 break;
2398         case PF_POOL_ROUNDROBIN:
2399                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2400                         if (!pfr_pool_get(rpool->cur->addr.p.tbl,
2401                             &rpool->tblidx, &rpool->counter,
2402                             &raddr, &rmask, af))
2403                                 goto get_addr;
2404                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2405                         if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2406                             &rpool->tblidx, &rpool->counter,
2407                             &raddr, &rmask, af))
2408                                 goto get_addr;
2409                 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
2410                         goto get_addr;
2411
2412         try_next:
2413                 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
2414                         rpool->cur = TAILQ_FIRST(&rpool->list);
2415                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2416                         rpool->tblidx = -1;
2417                         if (pfr_pool_get(rpool->cur->addr.p.tbl,
2418                             &rpool->tblidx, &rpool->counter,
2419                             &raddr, &rmask, af)) {
2420                                 /* table contains no address of type 'af' */
2421                                 if (rpool->cur != acur)
2422                                         goto try_next;
2423                                 return (1);
2424                         }
2425                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2426                         rpool->tblidx = -1;
2427                         if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2428                             &rpool->tblidx, &rpool->counter,
2429                             &raddr, &rmask, af)) {
2430                                 /* table contains no address of type 'af' */
2431                                 if (rpool->cur != acur)
2432                                         goto try_next;
2433                                 return (1);
2434                         }
2435                 } else {
2436                         raddr = &rpool->cur->addr.v.a.addr;
2437                         rmask = &rpool->cur->addr.v.a.mask;
2438                         PF_ACPY(&rpool->counter, raddr, af);
2439                 }
2440
2441         get_addr:
2442                 PF_ACPY(naddr, &rpool->counter, af);
2443                 if (init_addr != NULL && PF_AZERO(init_addr, af))
2444                         PF_ACPY(init_addr, naddr, af);
2445                 PF_AINC(&rpool->counter, af);
2446                 break;
2447         }
2448         if (*sn != NULL)
2449                 PF_ACPY(&(*sn)->raddr, naddr, af);
2450
2451         if (pf_status.debug >= PF_DEBUG_MISC &&
2452             (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2453                 kprintf("pf_map_addr: selected address ");
2454                 pf_print_host(naddr, 0, af);
2455                 kprintf("\n");
2456         }
2457
2458         return (0);
2459 }
2460
2461 int
2462 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
2463     struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
2464     struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
2465     struct pf_src_node **sn)
2466 {
2467         struct pf_state_key_cmp key;
2468         struct pf_addr          init_addr;
2469         u_int16_t               cut;
2470
2471         bzero(&init_addr, sizeof(init_addr));
2472         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2473                 return (1);
2474
2475         if (proto == IPPROTO_ICMP) {
2476                 low = 1;
2477                 high = 65535;
2478         }
2479
2480         do {
2481                 key.af = af;
2482                 key.proto = proto;
2483                 PF_ACPY(&key.addr[1], daddr, key.af);
2484                 PF_ACPY(&key.addr[0], naddr, key.af);
2485                 key.port[1] = dport;
2486
2487                 /*
2488                  * port search; start random, step;
2489                  * similar 2 portloop in in_pcbbind
2490                  */
2491                 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
2492                     proto == IPPROTO_ICMP)) {
2493                         key.port[0] = dport;
2494                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
2495                                 return (0);
2496                 } else if (low == 0 && high == 0) {
2497                         key.port[0] = *nport;
2498                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
2499                                 return (0);
2500                 } else if (low == high) {
2501                         key.port[0] = htons(low);
2502                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
2503                                 *nport = htons(low);
2504                                 return (0);
2505                         }
2506                 } else {
2507                         u_int16_t tmp;
2508
2509                         if (low > high) {
2510                                 tmp = low;
2511                                 low = high;
2512                                 high = tmp;
2513                         }
2514                         /* low < high */
2515                         cut = htonl(karc4random()) % (1 + high - low) + low;
2516                         /* low <= cut <= high */
2517                         for (tmp = cut; tmp <= high; ++(tmp)) {
2518                                 key.port[0] = htons(tmp);
2519                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
2520                                     NULL && !in_baddynamic(tmp, proto)) {
2521                                         *nport = htons(tmp);
2522                                         return (0);
2523                                 }
2524                         }
2525                         for (tmp = cut - 1; tmp >= low; --(tmp)) {
2526                                 key.port[0] = htons(tmp);
2527                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
2528                                     NULL && !in_baddynamic(tmp, proto)) {
2529                                         *nport = htons(tmp);
2530                                         return (0);
2531                                 }
2532                         }
2533                 }
2534
2535                 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
2536                 case PF_POOL_RANDOM:
2537                 case PF_POOL_ROUNDROBIN:
2538                         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2539                                 return (1);
2540                         break;
2541                 case PF_POOL_NONE:
2542                 case PF_POOL_SRCHASH:
2543                 case PF_POOL_BITMASK:
2544                 default:
2545                         return (1);
2546                 }
2547         } while (! PF_AEQ(&init_addr, naddr, af) );
2548         return (1);                                     /* none available */
2549 }
2550
2551 struct pf_rule *
2552 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
2553     int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
2554     struct pf_addr *daddr, u_int16_t dport, int rs_num)
2555 {
2556         struct pf_rule          *r, *rm = NULL;
2557         struct pf_ruleset       *ruleset = NULL;
2558         int                      tag = -1;
2559         int                      rtableid = -1;
2560         int                      asd = 0;
2561
2562         r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
2563         while (r && rm == NULL) {
2564                 struct pf_rule_addr     *src = NULL, *dst = NULL;
2565                 struct pf_addr_wrap     *xdst = NULL;
2566
2567                 if (r->action == PF_BINAT && direction == PF_IN) {
2568                         src = &r->dst;
2569                         if (r->rpool.cur != NULL)
2570                                 xdst = &r->rpool.cur->addr;
2571                 } else {
2572                         src = &r->src;
2573                         dst = &r->dst;
2574                 }
2575
2576                 r->evaluations++;
2577                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
2578                         r = r->skip[PF_SKIP_IFP].ptr;
2579                 else if (r->direction && r->direction != direction)
2580                         r = r->skip[PF_SKIP_DIR].ptr;
2581                 else if (r->af && r->af != pd->af)
2582                         r = r->skip[PF_SKIP_AF].ptr;
2583                 else if (r->proto && r->proto != pd->proto)
2584                         r = r->skip[PF_SKIP_PROTO].ptr;
2585                 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
2586                     src->neg, kif))
2587                         r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
2588                             PF_SKIP_DST_ADDR].ptr;
2589                 else if (src->port_op && !pf_match_port(src->port_op,
2590                     src->port[0], src->port[1], sport))
2591                         r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
2592                             PF_SKIP_DST_PORT].ptr;
2593                 else if (dst != NULL &&
2594                     PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL))
2595                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2596                 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
2597                     0, NULL))
2598                         r = TAILQ_NEXT(r, entries);
2599                 else if (dst != NULL && dst->port_op &&
2600                     !pf_match_port(dst->port_op, dst->port[0],
2601                     dst->port[1], dport))
2602                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2603                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
2604                         r = TAILQ_NEXT(r, entries);
2605                 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2606                     IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2607                     off, pd->hdr.tcp), r->os_fingerprint)))
2608                         r = TAILQ_NEXT(r, entries);
2609                 else {
2610                         if (r->tag)
2611                                 tag = r->tag;
2612                         if (r->rtableid >= 0)
2613                                 rtableid = r->rtableid;
2614                         if (r->anchor == NULL) {
2615                                 rm = r;
2616                         } else
2617                                 pf_step_into_anchor(&asd, &ruleset, rs_num,
2618                                     &r, NULL, NULL);
2619                 }
2620                 if (r == NULL)
2621                         pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r,
2622                             NULL, NULL);
2623         }
2624         if (pf_tag_packet(m, tag, rtableid))
2625                 return (NULL);
2626         if (rm != NULL && (rm->action == PF_NONAT ||
2627             rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2628                 return (NULL);
2629         return (rm);
2630 }
2631
2632 struct pf_rule *
2633 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2634     struct pfi_kif *kif, struct pf_src_node **sn,
2635     struct pf_state_key **skw, struct pf_state_key **sks,
2636     struct pf_state_key **skp, struct pf_state_key **nkp,
2637     struct pf_addr *saddr, struct pf_addr *daddr,
2638     u_int16_t sport, u_int16_t dport)
2639 {
2640         struct pf_rule  *r = NULL;
2641
2642
2643         if (direction == PF_OUT) {
2644                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2645                     sport, daddr, dport, PF_RULESET_BINAT);
2646                 if (r == NULL)
2647                         r = pf_match_translation(pd, m, off, direction, kif,
2648                             saddr, sport, daddr, dport, PF_RULESET_NAT);
2649         } else {
2650                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2651                     sport, daddr, dport, PF_RULESET_RDR);
2652                 if (r == NULL)
2653                         r = pf_match_translation(pd, m, off, direction, kif,
2654                             saddr, sport, daddr, dport, PF_RULESET_BINAT);
2655         }
2656
2657         if (r != NULL) {
2658                 struct pf_addr  *naddr;
2659                 u_int16_t       *nport;
2660
2661                 if (pf_state_key_setup(pd, r, skw, sks, skp, nkp,
2662                     saddr, daddr, sport, dport))
2663                         return r;
2664
2665                 /* XXX We only modify one side for now. */
2666                 naddr = &(*nkp)->addr[1];
2667                 nport = &(*nkp)->port[1];
2668
2669                 switch (r->action) {
2670                 case PF_NONAT:
2671                 case PF_NOBINAT:
2672                 case PF_NORDR:
2673                         return (NULL);
2674                 case PF_NAT:
2675                         if (pf_get_sport(pd->af, pd->proto, r, saddr,
2676                             daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2677                             r->rpool.proxy_port[1], sn)) {
2678                                 DPFPRINTF(PF_DEBUG_MISC,
2679                                     ("pf: NAT proxy port allocation "
2680                                     "(%u-%u) failed\n",
2681                                     r->rpool.proxy_port[0],
2682                                     r->rpool.proxy_port[1]));
2683                                 return (NULL);
2684                         }
2685                         break;
2686                 case PF_BINAT:
2687                         switch (direction) {
2688                         case PF_OUT:
2689                                 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
2690                                         switch (pd->af) {
2691 #ifdef INET
2692                                         case AF_INET:
2693                                                 if (r->rpool.cur->addr.p.dyn->
2694                                                     pfid_acnt4 < 1)
2695                                                         return (NULL);
2696                                                 PF_POOLMASK(naddr,
2697                                                     &r->rpool.cur->addr.p.dyn->
2698                                                     pfid_addr4,
2699                                                     &r->rpool.cur->addr.p.dyn->
2700                                                     pfid_mask4,
2701                                                     saddr, AF_INET);
2702                                                 break;
2703 #endif /* INET */
2704 #ifdef INET6
2705                                         case AF_INET6:
2706                                                 if (r->rpool.cur->addr.p.dyn->
2707                                                     pfid_acnt6 < 1)
2708                                                         return (NULL);
2709                                                 PF_POOLMASK(naddr,
2710                                                     &r->rpool.cur->addr.p.dyn->
2711                                                     pfid_addr6,
2712                                                     &r->rpool.cur->addr.p.dyn->
2713                                                     pfid_mask6,
2714                                                     saddr, AF_INET6);
2715                                                 break;
2716 #endif /* INET6 */
2717                                         }
2718                                 } else
2719                                         PF_POOLMASK(naddr,
2720                                             &r->rpool.cur->addr.v.a.addr,
2721                                             &r->rpool.cur->addr.v.a.mask,
2722                                             saddr, pd->af);
2723                                 break;
2724                         case PF_IN:
2725                                 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
2726                                         switch (pd->af) {
2727 #ifdef INET
2728                                         case AF_INET:
2729                                                 if (r->src.addr.p.dyn->
2730                                                     pfid_acnt4 < 1)
2731                                                         return (NULL);
2732                                                 PF_POOLMASK(naddr,
2733                                                     &r->src.addr.p.dyn->
2734                                                     pfid_addr4,
2735                                                     &r->src.addr.p.dyn->
2736                                                     pfid_mask4,
2737                                                     daddr, AF_INET);
2738                                                 break;
2739 #endif /* INET */
2740 #ifdef INET6
2741                                         case AF_INET6:
2742                                                 if (r->src.addr.p.dyn->
2743                                                     pfid_acnt6 < 1)
2744                                                         return (NULL);
2745                                                 PF_POOLMASK(naddr,
2746                                                     &r->src.addr.p.dyn->
2747                                                     pfid_addr6,
2748                                                     &r->src.addr.p.dyn->
2749                                                     pfid_mask6,
2750                                                     daddr, AF_INET6);
2751                                                 break;
2752 #endif /* INET6 */
2753                                         }
2754                                 } else
2755                                         PF_POOLMASK(naddr,
2756                                             &r->src.addr.v.a.addr,
2757                                             &r->src.addr.v.a.mask, daddr,
2758                                             pd->af);
2759                                 break;
2760                         }
2761                         break;
2762                 case PF_RDR: {
2763                         if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
2764                                 return (NULL);
2765                         if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
2766                             PF_POOL_BITMASK)
2767                                 PF_POOLMASK(naddr, naddr,
2768                                     &r->rpool.cur->addr.v.a.mask, daddr,
2769                                     pd->af);
2770
2771                         if (r->rpool.proxy_port[1]) {
2772                                 u_int32_t       tmp_nport;
2773
2774                                 tmp_nport = ((ntohs(dport) -
2775                                     ntohs(r->dst.port[0])) %
2776                                     (r->rpool.proxy_port[1] -
2777                                     r->rpool.proxy_port[0] + 1)) +
2778                                     r->rpool.proxy_port[0];
2779
2780                                 /* wrap around if necessary */
2781                                 if (tmp_nport > 65535)
2782                                         tmp_nport -= 65535;
2783                                 *nport = htons((u_int16_t)tmp_nport);
2784                         } else if (r->rpool.proxy_port[0])
2785                                 *nport = htons(r->rpool.proxy_port[0]);
2786                         break;
2787                 }
2788                 default:
2789                         return (NULL);
2790                 }
2791         }
2792
2793         return (r);
2794 }
2795
2796 #ifdef SMP
2797 struct netmsg_hashlookup {
2798         struct netmsg_base      base;
2799         struct inpcb            **nm_pinp;
2800         struct inpcbinfo        *nm_pcbinfo;
2801         struct pf_addr          *nm_saddr;
2802         struct pf_addr          *nm_daddr;
2803         uint16_t                nm_sport;
2804         uint16_t                nm_dport;
2805         sa_family_t             nm_af;
2806 };
2807
2808 static void
2809 in_pcblookup_hash_handler(netmsg_t msg)
2810 {
2811         struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg;
2812
2813         if (rmsg->nm_af == AF_INET)
2814                 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo,
2815                     rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4,
2816                     rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2817 #ifdef INET6
2818         else
2819                 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo,
2820                     &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6,
2821                     rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2822 #endif /* INET6 */
2823         lwkt_replymsg(&rmsg->base.lmsg, 0);
2824 }
2825 #endif /* SMP */
2826
2827 int
2828 pf_socket_lookup(int direction, struct pf_pdesc *pd)
2829 {
2830         struct pf_addr          *saddr, *daddr;
2831         u_int16_t                sport, dport;
2832         struct inpcbinfo        *pi;
2833         struct inpcb            *inp;
2834 #ifdef SMP
2835         struct netmsg_hashlookup *msg = NULL;
2836         struct netmsg_hashlookup msg0;
2837 #endif
2838         int                      pi_cpu = 0;
2839
2840         if (pd == NULL)
2841                 return (-1);
2842         pd->lookup.uid = UID_MAX;
2843         pd->lookup.gid = GID_MAX;
2844         pd->lookup.pid = NO_PID;
2845         if (direction == PF_IN) {
2846                 saddr = pd->src;
2847                 daddr = pd->dst;
2848         } else {
2849                 saddr = pd->dst;
2850                 daddr = pd->src;
2851         }
2852         switch (pd->proto) {
2853         case IPPROTO_TCP:
2854                 if (pd->hdr.tcp == NULL)
2855                         return (-1);
2856                 sport = pd->hdr.tcp->th_sport;
2857                 dport = pd->hdr.tcp->th_dport;
2858
2859                 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2860                 pi = &tcbinfo[pi_cpu];
2861 #ifdef SMP
2862                 /*
2863                  * Our netstack runs lockless on MP systems
2864                  * (only for TCP connections at the moment).
2865                  *
2866                  * As we are not allowed to read another CPU's tcbinfo,
2867                  * we have to ask that CPU via remote call to search the
2868                  * table for us.
2869                  *
2870                  * Prepare a msg iff data belongs to another CPU.
2871                  */
2872                 if (pi_cpu != mycpu->gd_cpuid) {
2873                         msg = &msg0;
2874                         netmsg_init(&msg->base, NULL, &curthread->td_msgport,
2875                                     0, in_pcblookup_hash_handler);
2876                         msg->nm_pinp = &inp;
2877                         msg->nm_pcbinfo = pi;
2878                         msg->nm_saddr = saddr;
2879                         msg->nm_sport = sport;
2880                         msg->nm_daddr = daddr;
2881                         msg->nm_dport = dport;
2882                         msg->nm_af = pd->af;
2883                 }
2884 #endif /* SMP */
2885                 break;
2886         case IPPROTO_UDP:
2887                 if (pd->hdr.udp == NULL)
2888                         return (-1);
2889                 sport = pd->hdr.udp->uh_sport;
2890                 dport = pd->hdr.udp->uh_dport;
2891                 pi = &udbinfo;
2892                 break;
2893         default:
2894                 return (-1);
2895         }
2896         if (direction != PF_IN) {
2897                 u_int16_t       p;
2898
2899                 p = sport;
2900                 sport = dport;
2901                 dport = p;
2902         }
2903         switch (pd->af) {
2904 #ifdef INET6
2905         case AF_INET6:
2906 #ifdef SMP
2907                 /*
2908                  * Query other CPU, second part
2909                  *
2910                  * msg only gets initialized when:
2911                  * 1) packet is TCP
2912                  * 2) the info belongs to another CPU
2913                  *
2914                  * Use some switch/case magic to avoid code duplication.
2915                  */
2916                 if (msg == NULL)
2917 #endif /* SMP */
2918                 {
2919                         inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
2920                             &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
2921
2922                         if (inp == NULL)
2923                                 return (-1);
2924                         break;
2925                 }
2926                 /* FALLTHROUGH if SMP and on other CPU */
2927 #endif /* INET6 */
2928         case AF_INET:
2929 #ifdef SMP
2930                 if (msg != NULL) {
2931                         lwkt_domsg(cpu_portfn(pi_cpu),
2932                                      &msg->base.lmsg, 0);
2933                 } else
2934 #endif /* SMP */
2935                 {
2936                         inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2937                             dport, INPLOOKUP_WILDCARD, NULL);
2938                 }
2939                 if (inp == NULL)
2940                         return (-1);
2941                 break;
2942
2943         default:
2944                 return (-1);
2945         }
2946         pd->lookup.uid = inp->inp_socket->so_cred->cr_uid;
2947         pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0];
2948         return (1);
2949 }
2950
2951 u_int8_t
2952 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2953 {
2954         int              hlen;
2955         u_int8_t         hdr[60];
2956         u_int8_t        *opt, optlen;
2957         u_int8_t         wscale = 0;
2958
2959         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
2960         if (hlen <= sizeof(struct tcphdr))
2961                 return (0);
2962         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2963                 return (0);
2964         opt = hdr + sizeof(struct tcphdr);
2965         hlen -= sizeof(struct tcphdr);
2966         while (hlen >= 3) {
2967                 switch (*opt) {
2968                 case TCPOPT_EOL:
2969                 case TCPOPT_NOP:
2970                         ++opt;
2971                         --hlen;
2972                         break;
2973                 case TCPOPT_WINDOW:
2974                         wscale = opt[2];
2975                         if (wscale > TCP_MAX_WINSHIFT)
2976                                 wscale = TCP_MAX_WINSHIFT;
2977                         wscale |= PF_WSCALE_FLAG;
2978                         /* FALLTHROUGH */
2979                 default:
2980                         optlen = opt[1];
2981                         if (optlen < 2)
2982                                 optlen = 2;
2983                         hlen -= optlen;
2984                         opt += optlen;
2985                         break;
2986                 }
2987         }
2988         return (wscale);
2989 }
2990
2991 u_int16_t
2992 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2993 {
2994         int              hlen;
2995         u_int8_t         hdr[60];
2996         u_int8_t        *opt, optlen;
2997         u_int16_t        mss = tcp_mssdflt;
2998
2999         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
3000         if (hlen <= sizeof(struct tcphdr))
3001                 return (0);
3002         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3003                 return (0);
3004         opt = hdr + sizeof(struct tcphdr);
3005         hlen -= sizeof(struct tcphdr);
3006         while (hlen >= TCPOLEN_MAXSEG) {
3007                 switch (*opt) {
3008                 case TCPOPT_EOL:
3009                 case TCPOPT_NOP:
3010                         ++opt;
3011                         --hlen;
3012                         break;
3013                 case TCPOPT_MAXSEG:
3014                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3015                         /* FALLTHROUGH */
3016                 default:
3017                         optlen = opt[1];
3018                         if (optlen < 2)
3019                                 optlen = 2;
3020                         hlen -= optlen;
3021                         opt += optlen;
3022                         break;
3023                 }
3024         }
3025         return (mss);
3026 }
3027
3028 u_int16_t
3029 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
3030 {
3031 #ifdef INET
3032         struct sockaddr_in      *dst;
3033         struct route             ro;
3034 #endif /* INET */
3035 #ifdef INET6
3036         struct sockaddr_in6     *dst6;
3037         struct route_in6         ro6;
3038 #endif /* INET6 */
3039         struct rtentry          *rt = NULL;
3040         int                      hlen = 0;
3041         u_int16_t                mss = tcp_mssdflt;
3042
3043         switch (af) {
3044 #ifdef INET
3045         case AF_INET:
3046                 hlen = sizeof(struct ip);
3047                 bzero(&ro, sizeof(ro));
3048                 dst = (struct sockaddr_in *)&ro.ro_dst;
3049                 dst->sin_family = AF_INET;
3050                 dst->sin_len = sizeof(*dst);
3051                 dst->sin_addr = addr->v4;
3052                 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
3053                 rt = ro.ro_rt;
3054                 break;
3055 #endif /* INET */
3056 #ifdef INET6
3057         case AF_INET6:
3058                 hlen = sizeof(struct ip6_hdr);
3059                 bzero(&ro6, sizeof(ro6));
3060                 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
3061                 dst6->sin6_family = AF_INET6;
3062                 dst6->sin6_len = sizeof(*dst6);
3063                 dst6->sin6_addr = addr->v6;
3064                 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
3065                 rt = ro6.ro_rt;
3066                 break;
3067 #endif /* INET6 */
3068         }
3069
3070         if (rt && rt->rt_ifp) {
3071                 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
3072                 mss = max(tcp_mssdflt, mss);
3073                 RTFREE(rt);
3074         }
3075         mss = min(mss, offer);
3076         mss = max(mss, 64);             /* sanity - at least max opt space */
3077         return (mss);
3078 }
3079
3080 void
3081 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
3082 {
3083         struct pf_rule *r = s->rule.ptr;
3084
3085         s->rt_kif = NULL;
3086         if (!r->rt || r->rt == PF_FASTROUTE)
3087                 return;
3088         switch (s->key[PF_SK_WIRE]->af) {
3089 #ifdef INET
3090         case AF_INET:
3091                 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
3092                     &s->nat_src_node);
3093                 s->rt_kif = r->rpool.cur->kif;
3094                 break;
3095 #endif /* INET */
3096 #ifdef INET6
3097         case AF_INET6:
3098                 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
3099                     &s->nat_src_node);
3100                 s->rt_kif = r->rpool.cur->kif;
3101                 break;
3102 #endif /* INET6 */
3103         }
3104 }
3105
3106 u_int32_t
3107 pf_tcp_iss(struct pf_pdesc *pd)
3108 {
3109         MD5_CTX ctx;
3110         u_int32_t digest[4];
3111
3112         if (pf_tcp_secret_init == 0) {
3113                 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret));
3114                 MD5Init(&pf_tcp_secret_ctx);
3115                 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret,
3116                     sizeof(pf_tcp_secret));
3117                 pf_tcp_secret_init = 1;
3118         }
3119         ctx = pf_tcp_secret_ctx;
3120
3121         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3122         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3123         if (pd->af == AF_INET6) {
3124                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3125                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3126         } else {
3127                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3128                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3129         }
3130         MD5Final((u_char *)digest, &ctx);
3131         pf_tcp_iss_off += 4096;
3132         return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off);
3133 }
3134
3135 int
3136 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3137     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3138     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
3139     struct ifqueue *ifq, struct inpcb *inp)
3140 {
3141         struct pf_rule          *nr = NULL;
3142         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3143         sa_family_t              af = pd->af;
3144         struct pf_rule          *r, *a = NULL;
3145         struct pf_ruleset       *ruleset = NULL;
3146         struct pf_src_node      *nsn = NULL;
3147         struct tcphdr           *th = pd->hdr.tcp;
3148         struct pf_state_key     *skw = NULL, *sks = NULL;
3149         struct pf_state_key     *sk = NULL, *nk = NULL;
3150         u_short                  reason;
3151         int                      rewrite = 0, hdrlen = 0;
3152         int                      tag = -1, rtableid = -1;
3153         int                      asd = 0;
3154         int                      match = 0;
3155         int                      state_icmp = 0;
3156         u_int16_t                sport = 0, dport = 0;
3157         u_int16_t                nport = 0, bport = 0;
3158         u_int16_t                bproto_sum = 0, bip_sum = 0;
3159         u_int8_t                 icmptype = 0, icmpcode = 0;
3160
3161
3162         if (direction == PF_IN && pf_check_congestion(ifq)) {
3163                 REASON_SET(&reason, PFRES_CONGEST);
3164                 return (PF_DROP);
3165         }
3166
3167         if (inp != NULL)
3168                 pd->lookup.done = pf_socket_lookup(direction, pd);
3169         else if (debug_pfugidhack) {
3170                 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n"));
3171                 pd->lookup.done = pf_socket_lookup(direction, pd);
3172         }
3173
3174         switch (pd->proto) {
3175         case IPPROTO_TCP:
3176                 sport = th->th_sport;
3177                 dport = th->th_dport;
3178                 hdrlen = sizeof(*th);
3179                 break;
3180         case IPPROTO_UDP:
3181                 sport = pd->hdr.udp->uh_sport;
3182                 dport = pd->hdr.udp->uh_dport;
3183                 hdrlen = sizeof(*pd->hdr.udp);
3184                 break;
3185 #ifdef INET
3186         case IPPROTO_ICMP:
3187                 if (pd->af != AF_INET)
3188                         break;
3189                 sport = dport = pd->hdr.icmp->icmp_id;
3190                 hdrlen = sizeof(*pd->hdr.icmp);
3191                 icmptype = pd->hdr.icmp->icmp_type;
3192                 icmpcode = pd->hdr.icmp->icmp_code;
3193
3194                 if (icmptype == ICMP_UNREACH ||
3195                     icmptype == ICMP_SOURCEQUENCH ||
3196                     icmptype == ICMP_REDIRECT ||
3197                     icmptype == ICMP_TIMXCEED ||
3198                     icmptype == ICMP_PARAMPROB)
3199                         state_icmp++;
3200                 break;
3201 #endif /* INET */
3202 #ifdef INET6
3203         case IPPROTO_ICMPV6:
3204                 if (af != AF_INET6)
3205                         break;
3206                 sport = dport = pd->hdr.icmp6->icmp6_id;
3207                 hdrlen = sizeof(*pd->hdr.icmp6);
3208                 icmptype = pd->hdr.icmp6->icmp6_type;
3209                 icmpcode = pd->hdr.icmp6->icmp6_code;
3210
3211                 if (icmptype == ICMP6_DST_UNREACH ||
3212                     icmptype == ICMP6_PACKET_TOO_BIG ||
3213                     icmptype == ICMP6_TIME_EXCEEDED ||
3214                     icmptype == ICMP6_PARAM_PROB)
3215                         state_icmp++;
3216                 break;
3217 #endif /* INET6 */
3218         default:
3219                 sport = dport = hdrlen = 0;
3220                 break;
3221         }
3222
3223         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3224
3225         bport = nport = sport;
3226         /* check packet for BINAT/NAT/RDR */
3227         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn,
3228             &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) {
3229                 if (nk == NULL || sk == NULL) {
3230                         REASON_SET(&reason, PFRES_MEMORY);
3231                         goto cleanup;
3232                 }
3233
3234                 if (pd->ip_sum)
3235                         bip_sum = *pd->ip_sum;
3236
3237                 switch (pd->proto) {
3238                 case IPPROTO_TCP:
3239                         bproto_sum = th->th_sum;
3240                         pd->proto_sum = &th->th_sum;
3241
3242                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3243                             nk->port[pd->sidx] != sport) {
3244                                 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
3245                                     &th->th_sum, &nk->addr[pd->sidx],
3246                                     nk->port[pd->sidx], 0, af);
3247                                 pd->sport = &th->th_sport;
3248                                 sport = th->th_sport;
3249                         }
3250
3251                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3252                             nk->port[pd->didx] != dport) {
3253                                 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
3254                                     &th->th_sum, &nk->addr[pd->didx],
3255                                     nk->port[pd->didx], 0, af);
3256                                 dport = th->th_dport;
3257                                 pd->dport = &th->th_dport;
3258                         }
3259                         rewrite++;
3260                         break;
3261                 case IPPROTO_UDP:
3262                         bproto_sum = pd->hdr.udp->uh_sum;
3263                         pd->proto_sum = &pd->hdr.udp->uh_sum;
3264
3265                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3266                             nk->port[pd->sidx] != sport) {
3267                                 pf_change_ap(saddr, &pd->hdr.udp->uh_sport,
3268                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3269                                     &nk->addr[pd->sidx],
3270                                     nk->port[pd->sidx], 1, af);
3271                                 sport = pd->hdr.udp->uh_sport;
3272                                 pd->sport = &pd->hdr.udp->uh_sport;
3273                         }
3274
3275                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3276                             nk->port[pd->didx] != dport) {
3277                                 pf_change_ap(daddr, &pd->hdr.udp->uh_dport,
3278                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3279                                     &nk->addr[pd->didx],
3280                                     nk->port[pd->didx], 1, af);
3281                                 dport = pd->hdr.udp->uh_dport;
3282                                 pd->dport = &pd->hdr.udp->uh_dport;
3283                         }
3284                         rewrite++;
3285                         break;
3286 #ifdef INET
3287                 case IPPROTO_ICMP:
3288                         nk->port[0] = nk->port[1];
3289                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3290                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3291                                     nk->addr[pd->sidx].v4.s_addr, 0);
3292
3293                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3294                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3295                                     nk->addr[pd->didx].v4.s_addr, 0);
3296
3297                         if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3298                                 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3299                                     pd->hdr.icmp->icmp_cksum, sport,
3300                                     nk->port[1], 0);
3301                                 pd->hdr.icmp->icmp_id = nk->port[1];
3302                                 pd->sport = &pd->hdr.icmp->icmp_id;
3303                         }
3304                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3305                         break;
3306 #endif /* INET */
3307 #ifdef INET6
3308                 case IPPROTO_ICMPV6:
3309                         nk->port[0] = nk->port[1];
3310                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3311                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3312                                     &nk->addr[pd->sidx], 0);
3313
3314                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3315                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3316                                     &nk->addr[pd->didx], 0);
3317                         rewrite++;
3318                         break;
3319 #endif /* INET */
3320                 default:
3321                         switch (af) {
3322 #ifdef INET
3323                         case AF_INET:
3324                                 if (PF_ANEQ(saddr,
3325                                     &nk->addr[pd->sidx], AF_INET))
3326                                         pf_change_a(&saddr->v4.s_addr,
3327                                             pd->ip_sum,
3328                                             nk->addr[pd->sidx].v4.s_addr, 0);
3329
3330                                 if (PF_ANEQ(daddr,
3331                                     &nk->addr[pd->didx], AF_INET))
3332                                         pf_change_a(&daddr->v4.s_addr,
3333                                             pd->ip_sum,
3334                                             nk->addr[pd->didx].v4.s_addr, 0);
3335                                 break;
3336 #endif /* INET */
3337 #ifdef INET6
3338                         case AF_INET6:
3339                                 if (PF_ANEQ(saddr,
3340                                     &nk->addr[pd->sidx], AF_INET6))
3341                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3342
3343                                 if (PF_ANEQ(daddr,
3344                                     &nk->addr[pd->didx], AF_INET6))
3345                                         PF_ACPY(saddr, &nk->addr[pd->didx], af);
3346                                 break;
3347 #endif /* INET */
3348                         }
3349                         break;
3350                 }
3351                 if (nr->natpass)
3352                         r = NULL;
3353                 pd->nat_rule = nr;
3354         }
3355
3356         while (r != NULL) {
3357                 r->evaluations++;
3358                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3359                         r = r->skip[PF_SKIP_IFP].ptr;
3360                 else if (r->direction && r->direction != direction)
3361                         r = r->skip[PF_SKIP_DIR].ptr;
3362                 else if (r->af && r->af != af)
3363                         r = r->skip[PF_SKIP_AF].ptr;
3364                 else if (r->proto && r->proto != pd->proto)
3365                         r = r->skip[PF_SKIP_PROTO].ptr;
3366                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3367                     r->src.neg, kif))
3368                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3369                 /* tcp/udp only. port_op always 0 in other cases */
3370                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3371                     r->src.port[0], r->src.port[1], sport))
3372                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
3373                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3374                     r->dst.neg, NULL))
3375                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3376                 /* tcp/udp only. port_op always 0 in other cases */
3377                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3378                     r->dst.port[0], r->dst.port[1], dport))
3379                         r = r->skip[PF_SKIP_DST_PORT].ptr;
3380                 /* icmp only. type always 0 in other cases */
3381                 else if (r->type && r->type != icmptype + 1)
3382                         r = TAILQ_NEXT(r, entries);
3383                 /* icmp only. type always 0 in other cases */
3384                 else if (r->code && r->code != icmpcode + 1)
3385                         r = TAILQ_NEXT(r, entries);
3386                 else if (r->tos && !(r->tos == pd->tos))
3387                         r = TAILQ_NEXT(r, entries);
3388                 else if (r->rule_flag & PFRULE_FRAGMENT)
3389                         r = TAILQ_NEXT(r, entries);
3390                 else if (pd->proto == IPPROTO_TCP &&
3391                     (r->flagset & th->th_flags) != r->flags)
3392                         r = TAILQ_NEXT(r, entries);
3393                 /* tcp/udp only. uid.op always 0 in other cases */
3394                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3395                     pf_socket_lookup(direction, pd), 1)) &&
3396                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3397                     pd->lookup.uid))
3398                         r = TAILQ_NEXT(r, entries);
3399                 /* tcp/udp only. gid.op always 0 in other cases */
3400                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3401                     pf_socket_lookup(direction, pd), 1)) &&
3402                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3403                     pd->lookup.gid))
3404                         r = TAILQ_NEXT(r, entries);
3405                 else if (r->prob &&
3406                   r->prob <= karc4random())
3407                         r = TAILQ_NEXT(r, entries);
3408                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3409                         r = TAILQ_NEXT(r, entries);
3410                 else if (r->os_fingerprint != PF_OSFP_ANY &&
3411                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3412                     pf_osfp_fingerprint(pd, m, off, th),
3413                     r->os_fingerprint)))
3414                         r = TAILQ_NEXT(r, entries);
3415                 else {
3416                         if (r->tag)
3417                                 tag = r->tag;
3418                         if (r->rtableid >= 0)
3419                                 rtableid = r->rtableid;
3420                         if (r->anchor == NULL) {
3421                                 match = 1;
3422                                 *rm = r;
3423                                 *am = a;
3424                                 *rsm = ruleset;
3425                                 if ((*rm)->quick)
3426                                         break;
3427                                 r = TAILQ_NEXT(r, entries);
3428                         } else
3429                                 pf_step_into_anchor(&asd, &ruleset,
3430                                     PF_RULESET_FILTER, &r, &a, &match);
3431                 }
3432                 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3433                     PF_RULESET_FILTER, &r, &a, &match))
3434                         break;
3435         }
3436         r = *rm;
3437         a = *am;
3438         ruleset = *rsm;
3439
3440         REASON_SET(&reason, PFRES_MATCH);
3441
3442         if (r->log || (nr != NULL && nr->log)) {
3443                 if (rewrite)
3444                         m_copyback(m, off, hdrlen, pd->hdr.any);
3445                 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
3446                     a, ruleset, pd);
3447         }
3448
3449         if ((r->action == PF_DROP) &&
3450             ((r->rule_flag & PFRULE_RETURNRST) ||
3451             (r->rule_flag & PFRULE_RETURNICMP) ||
3452             (r->rule_flag & PFRULE_RETURN))) {
3453                 /* undo NAT changes, if they have taken place */
3454                 if (nr != NULL) {
3455                         PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3456                         PF_ACPY(daddr, &sk->addr[pd->didx], af);
3457                         if (pd->sport)
3458                                 *pd->sport = sk->port[pd->sidx];
3459                         if (pd->dport)
3460                                 *pd->dport = sk->port[pd->didx];
3461                         if (pd->proto_sum)
3462                                 *pd->proto_sum = bproto_sum;
3463                         if (pd->ip_sum)
3464                                 *pd->ip_sum = bip_sum;
3465                         m_copyback(m, off, hdrlen, pd->hdr.any);
3466                 }
3467                 if (pd->proto == IPPROTO_TCP &&
3468                     ((r->rule_flag & PFRULE_RETURNRST) ||
3469                     (r->rule_flag & PFRULE_RETURN)) &&
3470                     !(th->th_flags & TH_RST)) {
3471                         u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
3472                         int              len = 0;
3473                         struct ip       *h4;
3474                         struct ip6_hdr  *h6;
3475
3476                         switch (af) {
3477                         case AF_INET:
3478                                 h4 = mtod(m, struct ip *);
3479                                 len = h4->ip_len - off;
3480                                 break;
3481 #ifdef INET6
3482                         case AF_INET6:
3483                                 h6 = mtod(m, struct ip6_hdr *);
3484                                 len = h6->ip6_plen - (off - sizeof(*h6));
3485                                 break;
3486 #endif
3487                         }
3488
3489                         if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3490                                 REASON_SET(&reason, PFRES_PROTCKSUM);
3491                         else {
3492                                 if (th->th_flags & TH_SYN)
3493                                         ack++;
3494                                 if (th->th_flags & TH_FIN)
3495                                         ack++;
3496                                 pf_send_tcp(r, af, pd->dst,
3497                                     pd->src, th->th_dport, th->th_sport,
3498                                     ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3499                                     r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
3500                         }
3501                 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3502                     r->return_icmp)
3503                         pf_send_icmp(m, r->return_icmp >> 8,
3504                             r->return_icmp & 255, af, r);
3505                 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3506                     r->return_icmp6)
3507                         pf_send_icmp(m, r->return_icmp6 >> 8,
3508                             r->return_icmp6 & 255, af, r);
3509         }
3510
3511         if (r->action == PF_DROP)
3512                 goto cleanup;
3513
3514         if (pf_tag_packet(m, tag, rtableid)) {
3515                 REASON_SET(&reason, PFRES_MEMORY);
3516                 goto cleanup;
3517         }
3518
3519         if (!state_icmp && (r->keep_state || nr != NULL ||
3520             (pd->flags & PFDESC_TCP_NORM))) {
3521                 int action;
3522                 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m,
3523                     off, sport, dport, &rewrite, kif, sm, tag, bproto_sum,
3524                     bip_sum, hdrlen);
3525                 if (action != PF_PASS)
3526                         return (action);
3527         }
3528
3529         /* copy back packet headers if we performed NAT operations */
3530         if (rewrite)
3531                 m_copyback(m, off, hdrlen, pd->hdr.any);
3532
3533         return (PF_PASS);
3534
3535 cleanup:
3536         if (sk != NULL)
3537                 pool_put(&pf_state_key_pl, sk);
3538         if (nk != NULL)
3539                 pool_put(&pf_state_key_pl, nk);
3540         return (PF_DROP);
3541 }
3542
3543 static __inline int
3544 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3545     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw,
3546     struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk,
3547     struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite,
3548     struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum,
3549     u_int16_t bip_sum, int hdrlen)
3550 {
3551         struct pf_state         *s = NULL;
3552         struct pf_src_node      *sn = NULL;
3553         struct tcphdr           *th = pd->hdr.tcp;
3554         u_int16_t                mss = tcp_mssdflt;
3555         u_short                  reason;
3556
3557         /* check maximums */
3558         if (r->max_states && (r->states_cur >= r->max_states)) {
3559                 pf_status.lcounters[LCNT_STATES]++;
3560                 REASON_SET(&reason, PFRES_MAXSTATES);
3561                 return (PF_DROP);
3562         }
3563         /* src node for filter rule */
3564         if ((r->rule_flag & PFRULE_SRCTRACK ||
3565             r->rpool.opts & PF_POOL_STICKYADDR) &&
3566             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3567                 REASON_SET(&reason, PFRES_SRCLIMIT);
3568                 goto csfailed;
3569         }
3570         /* src node for translation rule */
3571         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3572             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3573                 REASON_SET(&reason, PFRES_SRCLIMIT);
3574                 goto csfailed;
3575         }
3576         s = pool_get(&pf_state_pl, PR_NOWAIT | PR_ZERO);
3577         if (s == NULL) {
3578                 REASON_SET(&reason, PFRES_MEMORY);
3579                 goto csfailed;
3580         }
3581         s->id = 0; /* XXX Do we really need that? not in OpenBSD */
3582         s->creatorid = 0;
3583         s->rule.ptr = r;
3584         s->nat_rule.ptr = nr;
3585         s->anchor.ptr = a;
3586         STATE_INC_COUNTERS(s);
3587         if (r->allow_opts)
3588                 s->state_flags |= PFSTATE_ALLOWOPTS;
3589         if (r->rule_flag & PFRULE_STATESLOPPY)
3590                 s->state_flags |= PFSTATE_SLOPPY;
3591         s->log = r->log & PF_LOG_ALL;
3592         if (nr != NULL)
3593                 s->log |= nr->log & PF_LOG_ALL;
3594         switch (pd->proto) {
3595         case IPPROTO_TCP:
3596                 s->src.seqlo = ntohl(th->th_seq);
3597                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3598                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3599                     r->keep_state == PF_STATE_MODULATE) {
3600                         /* Generate sequence number modulator */
3601                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3602                             0)
3603                                 s->src.seqdiff = 1;
3604                         pf_change_a(&th->th_seq, &th->th_sum,
3605                             htonl(s->src.seqlo + s->src.seqdiff), 0);
3606                         *rewrite = 1;
3607                 } else
3608                         s->src.seqdiff = 0;
3609                 if (th->th_flags & TH_SYN) {
3610                         s->src.seqhi++;
3611                         s->src.wscale = pf_get_wscale(m, off,
3612                             th->th_off, pd->af);
3613                 }
3614                 s->src.max_win = MAX(ntohs(th->th_win), 1);
3615                 if (s->src.wscale & PF_WSCALE_MASK) {
3616                         /* Remove scale factor from initial window */
3617                         int win = s->src.max_win;
3618                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3619                         s->src.max_win = (win - 1) >>
3620                             (s->src.wscale & PF_WSCALE_MASK);
3621                 }
3622                 if (th->th_flags & TH_FIN)
3623                         s->src.seqhi++;
3624                 s->dst.seqhi = 1;
3625                 s->dst.max_win = 1;
3626                 s->src.state = TCPS_SYN_SENT;
3627                 s->dst.state = TCPS_CLOSED;
3628                 s->timeout = PFTM_TCP_FIRST_PACKET;
3629                 break;
3630         case IPPROTO_UDP:
3631                 s->src.state = PFUDPS_SINGLE;
3632                 s->dst.state = PFUDPS_NO_TRAFFIC;
3633                 s->timeout = PFTM_UDP_FIRST_PACKET;
3634                 break;
3635         case IPPROTO_ICMP:
3636 #ifdef INET6
3637         case IPPROTO_ICMPV6:
3638 #endif
3639                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3640                 break;
3641         default:
3642                 s->src.state = PFOTHERS_SINGLE;
3643                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3644                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3645         }
3646
3647         s->creation = time_second;
3648         s->expire = time_second;
3649
3650         if (sn != NULL) {
3651                 s->src_node = sn;
3652                 s->src_node->states++;
3653         }
3654         if (nsn != NULL) {
3655                 /* XXX We only modify one side for now. */
3656                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3657                 s->nat_src_node = nsn;
3658                 s->nat_src_node->states++;
3659         }
3660         if (pd->proto == IPPROTO_TCP) {
3661                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3662                     off, pd, th, &s->src, &s->dst)) {
3663                         REASON_SET(&reason, PFRES_MEMORY);
3664                         pf_src_tree_remove_state(s);
3665                         STATE_DEC_COUNTERS(s);
3666                         pool_put(&pf_state_pl, s);
3667                         return (PF_DROP);
3668                 }
3669                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3670                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3671                     &s->src, &s->dst, rewrite)) {
3672                         /* This really shouldn't happen!!! */
3673                         DPFPRINTF(PF_DEBUG_URGENT,
3674                             ("pf_normalize_tcp_stateful failed on first pkt"));
3675                         pf_normalize_tcp_cleanup(s);
3676                         pf_src_tree_remove_state(s);
3677                         STATE_DEC_COUNTERS(s);
3678                         pool_put(&pf_state_pl, s);
3679                         return (PF_DROP);
3680                 }
3681         }
3682         s->direction = pd->dir;
3683
3684         if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk,
3685             pd->src, pd->dst, sport, dport))
3686                 goto csfailed;
3687
3688         if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) {
3689                 if (pd->proto == IPPROTO_TCP)
3690                         pf_normalize_tcp_cleanup(s);
3691                 REASON_SET(&reason, PFRES_STATEINS);
3692                 pf_src_tree_remove_state(s);
3693                 STATE_DEC_COUNTERS(s);
3694                 pool_put(&pf_state_pl, s);
3695                 return (PF_DROP);
3696         } else
3697                 *sm = s;
3698
3699         pf_set_rt_ifp(s, pd->src);      /* needs s->state_key set */
3700         if (tag > 0) {
3701                 pf_tag_ref(tag);
3702                 s->tag = tag;
3703         }
3704         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3705             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3706                 s->src.state = PF_TCPS_PROXY_SRC;
3707                 /* undo NAT changes, if they have taken place */
3708                 if (nr != NULL) {
3709                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
3710                         if (pd->dir == PF_OUT)
3711                                 skt = s->key[PF_SK_STACK];
3712                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3713                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3714                         if (pd->sport)
3715                                 *pd->sport = skt->port[pd->sidx];
3716                         if (pd->dport)
3717                                 *pd->dport = skt->port[pd->didx];
3718                         if (pd->proto_sum)
3719                                 *pd->proto_sum = bproto_sum;
3720                         if (pd->ip_sum)
3721                                 *pd->ip_sum = bip_sum;
3722                         m_copyback(m, off, hdrlen, pd->hdr.any);
3723                 }
3724                 s->src.seqhi = htonl(karc4random());
3725                 /* Find mss option */
3726                 mss = pf_get_mss(m, off, th->th_off, pd->af);
3727                 mss = pf_calc_mss(pd->src, pd->af, mss);
3728                 mss = pf_calc_mss(pd->dst, pd->af, mss);
3729                 s->src.mss = mss;
3730                 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport,
3731                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3732                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
3733                 REASON_SET(&reason, PFRES_SYNPROXY);
3734                 return (PF_SYNPROXY_DROP);
3735         }
3736
3737         return (PF_PASS);
3738
3739 csfailed:
3740         if (sk != NULL)
3741                 pool_put(&pf_state_key_pl, sk);
3742         if (nk != NULL)
3743                 pool_put(&pf_state_key_pl, nk);
3744
3745         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3746                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3747                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3748                 pf_status.src_nodes--;
3749                 pool_put(&pf_src_tree_pl, sn);
3750         }
3751         if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) {
3752                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3753                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3754                 pf_status.src_nodes--;
3755                 pool_put(&pf_src_tree_pl, nsn);
3756         }
3757         return (PF_DROP);
3758 }
3759
3760 int
3761 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3762     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3763     struct pf_ruleset **rsm)
3764 {
3765         struct pf_rule          *r, *a = NULL;
3766         struct pf_ruleset       *ruleset = NULL;
3767         sa_family_t              af = pd->af;
3768         u_short                  reason;
3769         int                      tag = -1;
3770         int                      asd = 0;
3771         int                      match = 0;
3772
3773         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3774         while (r != NULL) {
3775                 r->evaluations++;
3776                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3777                         r = r->skip[PF_SKIP_IFP].ptr;
3778                 else if (r->direction && r->direction != direction)
3779                         r = r->skip[PF_SKIP_DIR].ptr;
3780                 else if (r->af && r->af != af)
3781                         r = r->skip[PF_SKIP_AF].ptr;
3782                 else if (r->proto && r->proto != pd->proto)
3783                         r = r->skip[PF_SKIP_PROTO].ptr;
3784                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3785                     r->src.neg, kif))
3786                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3787                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3788                     r->dst.neg, NULL))
3789                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3790                 else if (r->tos && !(r->tos == pd->tos))
3791                         r = TAILQ_NEXT(r, entries);
3792                 else if (r->os_fingerprint != PF_OSFP_ANY)
3793                         r = TAILQ_NEXT(r, entries);
3794                 else if (pd->proto == IPPROTO_UDP &&
3795                     (r->src.port_op || r->dst.port_op))
3796                         r = TAILQ_NEXT(r, entries);
3797                 else if (pd->proto == IPPROTO_TCP &&
3798                     (r->src.port_op || r->dst.port_op || r->flagset))
3799                         r = TAILQ_NEXT(r, entries);
3800                 else if ((pd->proto == IPPROTO_ICMP ||
3801                     pd->proto == IPPROTO_ICMPV6) &&
3802                     (r->type || r->code))
3803                         r = TAILQ_NEXT(r, entries);
3804                 else if (r->prob && r->prob <= karc4random())
3805                         r = TAILQ_NEXT(r, entries);
3806                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3807                         r = TAILQ_NEXT(r, entries);
3808                 else {
3809                         if (r->anchor == NULL) {
3810                                 match = 1;
3811                                 *rm = r;
3812                                 *am = a;
3813                                 *rsm = ruleset;
3814                                 if ((*rm)->quick)
3815                                         break;
3816                                 r = TAILQ_NEXT(r, entries);
3817                         } else
3818                                 pf_step_into_anchor(&asd, &ruleset,
3819                                     PF_RULESET_FILTER, &r, &a, &match);
3820                 }
3821                 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3822                     PF_RULESET_FILTER, &r, &a, &match))
3823                         break;
3824         }
3825         r = *rm;
3826         a = *am;
3827         ruleset = *rsm;
3828
3829         REASON_SET(&reason, PFRES_MATCH);
3830
3831         if (r->log)
3832                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
3833                     pd);
3834
3835         if (r->action != PF_PASS)
3836                 return (PF_DROP);
3837
3838         if (pf_tag_packet(m, tag, -1)) {
3839                 REASON_SET(&reason, PFRES_MEMORY);
3840                 return (PF_DROP);
3841         }
3842
3843         return (PF_PASS);
3844 }
3845
3846 int
3847 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3848         struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3849         struct pf_pdesc *pd, u_short *reason, int *copyback)
3850 {
3851         struct tcphdr           *th = pd->hdr.tcp;
3852         u_int16_t                win = ntohs(th->th_win);
3853         u_int32_t                ack, end, seq, orig_seq;
3854         u_int8_t                 sws, dws;
3855         int                      ackskew;
3856
3857         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3858                 sws = src->wscale & PF_WSCALE_MASK;
3859                 dws = dst->wscale & PF_WSCALE_MASK;
3860         } else
3861                 sws = dws = 0;
3862
3863         /*
3864          * Sequence tracking algorithm from Guido van Rooij's paper:
3865          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3866          *      tcp_filtering.ps
3867          */
3868
3869         orig_seq = seq = ntohl(th->th_seq);
3870         if (src->seqlo == 0) {
3871                 /* First packet from this end. Set its state */
3872
3873                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3874                     src->scrub == NULL) {
3875                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3876                                 REASON_SET(reason, PFRES_MEMORY);
3877                                 return (PF_DROP);
3878                         }
3879                 }
3880
3881                 /* Deferred generation of sequence number modulator */
3882                 if (dst->seqdiff && !src->seqdiff) {
3883                         /* use random iss for the TCP server */
3884                         while ((src->seqdiff = karc4random() - seq) == 0)
3885                                 ;
3886                         ack = ntohl(th->th_ack) - dst->seqdiff;
3887                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3888                             src->seqdiff), 0);
3889                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3890                         *copyback = 1;
3891                 } else {
3892                         ack = ntohl(th->th_ack);
3893                 }
3894
3895                 end = seq + pd->p_len;
3896                 if (th->th_flags & TH_SYN) {
3897                         end++;
3898                         (*state)->sync_flags |= PFSTATE_GOT_SYN2;
3899                         if (dst->wscale & PF_WSCALE_FLAG) {
3900                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3901                                     pd->af);
3902                                 if (src->wscale & PF_WSCALE_FLAG) {
3903                                         /* Remove scale factor from initial
3904                                          * window */
3905                                         sws = src->wscale & PF_WSCALE_MASK;
3906                                         win = ((u_int32_t)win + (1 << sws) - 1)
3907                                             >> sws;
3908                                         dws = dst->wscale & PF_WSCALE_MASK;
3909                                 } else {
3910                                         /* fixup other window */
3911                                         dst->max_win <<= dst->wscale &
3912                                             PF_WSCALE_MASK;
3913                                         /* in case of a retrans SYN|ACK */
3914                                         dst->wscale = 0;
3915                                 }
3916                         }
3917                 }
3918                 if (th->th_flags & TH_FIN)
3919                         end++;
3920
3921                 src->seqlo = seq;
3922                 if (src->state < TCPS_SYN_SENT)
3923                         src->state = TCPS_SYN_SENT;
3924
3925                 /*
3926                  * May need to slide the window (seqhi may have been set by
3927                  * the crappy stack check or if we picked up the connection
3928                  * after establishment)
3929                  */
3930                 if (src->seqhi == 1 ||
3931                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3932                         src->seqhi = end + MAX(1, dst->max_win << dws);
3933                 if (win > src->max_win)
3934                         src->max_win = win;
3935
3936         } else {
3937                 ack = ntohl(th->th_ack) - dst->seqdiff;
3938                 if (src->seqdiff) {
3939                         /* Modulate sequence numbers */
3940                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3941                             src->seqdiff), 0);
3942                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3943                         *copyback = 1;
3944                 }
3945                 end = seq + pd->p_len;
3946                 if (th->th_flags & TH_SYN)
3947                         end++;
3948                 if (th->th_flags & TH_FIN)
3949                         end++;
3950         }
3951
3952         if ((th->th_flags & TH_ACK) == 0) {
3953                 /* Let it pass through the ack skew check */
3954                 ack = dst->seqlo;
3955         } else if ((ack == 0 &&
3956             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3957             /* broken tcp stacks do not set ack */
3958             (dst->state < TCPS_SYN_SENT)) {
3959                 /*
3960                  * Many stacks (ours included) will set the ACK number in an
3961                  * FIN|ACK if the SYN times out -- no sequence to ACK.
3962                  */
3963                 ack = dst->seqlo;
3964         }
3965
3966         if (seq == end) {
3967                 /* Ease sequencing restrictions on no data packets */
3968                 seq = src->seqlo;
3969                 end = seq;
3970         }
3971
3972         ackskew = dst->seqlo - ack;
3973
3974
3975         /*
3976          * Need to demodulate the sequence numbers in any TCP SACK options
3977          * (Selective ACK). We could optionally validate the SACK values
3978          * against the current ACK window, either forwards or backwards, but
3979          * I'm not confident that SACK has been implemented properly
3980          * everywhere. It wouldn't surprise me if several stacks accidently
3981          * SACK too far backwards of previously ACKed data. There really aren't
3982          * any security implications of bad SACKing unless the target stack
3983          * doesn't validate the option length correctly. Someone trying to
3984          * spoof into a TCP connection won't bother blindly sending SACK
3985          * options anyway.
3986          */
3987         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
3988                 if (pf_modulate_sack(m, off, pd, th, dst))
3989                         *copyback = 1;
3990         }
3991
3992
3993 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
3994         if (SEQ_GEQ(src->seqhi, end) &&
3995             /* Last octet inside other's window space */
3996             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
3997             /* Retrans: not more than one window back */
3998             (ackskew >= -MAXACKWINDOW) &&
3999             /* Acking not more than one reassembled fragment backwards */
4000             (ackskew <= (MAXACKWINDOW << sws)) &&
4001             /* Acking not more than one window forward */
4002             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4003             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4004             (pd->flags & PFDESC_IP_REAS) == 0)) {
4005             /* Require an exact/+1 sequence match on resets when possible */
4006
4007                 if (dst->scrub || src->scrub) {
4008                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4009                             *state, src, dst, copyback))
4010                                 return (PF_DROP);
4011                 }
4012
4013                 /* update max window */
4014                 if (src->max_win < win)
4015                         src->max_win = win;
4016                 /* synchronize sequencing */
4017                 if (SEQ_GT(end, src->seqlo))
4018                         src->seqlo = end;
4019                 /* slide the window of what the other end can send */
4020                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4021                         dst->seqhi = ack + MAX((win << sws), 1);
4022
4023
4024                 /* update states */
4025                 if (th->th_flags & TH_SYN)
4026                         if (src->state < TCPS_SYN_SENT)
4027                                 src->state = TCPS_SYN_SENT;
4028                 if (th->th_flags & TH_FIN)
4029                         if (src->state < TCPS_CLOSING)
4030                                 src->state = TCPS_CLOSING;
4031                 if (th->th_flags & TH_ACK) {
4032                         if (dst->state == TCPS_SYN_SENT) {
4033                                 dst->state = TCPS_ESTABLISHED;
4034                                 if (src->state == TCPS_ESTABLISHED &&
4035                                     (*state)->src_node != NULL &&
4036                                     pf_src_connlimit(state)) {
4037                                         REASON_SET(reason, PFRES_SRCLIMIT);
4038                                         return (PF_DROP);
4039                                 }
4040                         } else if (dst->state == TCPS_CLOSING)
4041                                 dst->state = TCPS_FIN_WAIT_2;
4042                 }
4043                 if (th->th_flags & TH_RST)
4044                         src->state = dst->state = TCPS_TIME_WAIT;
4045
4046                 /* update expire time */
4047                 (*state)->expire = time_second;
4048                 if (src->state >= TCPS_FIN_WAIT_2 &&
4049                     dst->state >= TCPS_FIN_WAIT_2)
4050                         (*state)->timeout = PFTM_TCP_CLOSED;
4051                 else if (src->state >= TCPS_CLOSING &&
4052                     dst->state >= TCPS_CLOSING)
4053                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
4054                 else if (src->state < TCPS_ESTABLISHED ||
4055                     dst->state < TCPS_ESTABLISHED)
4056                         (*state)->timeout = PFTM_TCP_OPENING;
4057                 else if (src->state >= TCPS_CLOSING ||
4058                     dst->state >= TCPS_CLOSING)
4059                         (*state)->timeout = PFTM_TCP_CLOSING;
4060                 else
4061                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4062
4063                 /* Fall through to PASS packet */
4064
4065         } else if ((dst->state < TCPS_SYN_SENT ||
4066                 dst->state >= TCPS_FIN_WAIT_2 ||
4067                 src->state >= TCPS_FIN_WAIT_2) &&
4068             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4069             /* Within a window forward of the originating packet */
4070             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4071             /* Within a window backward of the originating packet */
4072
4073                 /*
4074                  * This currently handles three situations:
4075                  *  1) Stupid stacks will shotgun SYNs before their peer
4076                  *     replies.
4077                  *  2) When PF catches an already established stream (the
4078                  *     firewall rebooted, the state table was flushed, routes
4079                  *     changed...)
4080                  *  3) Packets get funky immediately after the connection
4081                  *     closes (this should catch Solaris spurious ACK|FINs
4082                  *     that web servers like to spew after a close)
4083                  *
4084                  * This must be a little more careful than the above code
4085                  * since packet floods will also be caught here. We don't
4086                  * update the TTL here to mitigate the damage of a packet
4087                  * flood and so the same code can handle awkward establishment
4088                  * and a loosened connection close.
4089                  * In the establishment case, a correct peer response will
4090                  * validate the connection, go through the normal state code
4091                  * and keep updating the state TTL.
4092                  */
4093
4094                 if (pf_status.debug >= PF_DEBUG_MISC) {
4095                         kprintf("pf: loose state match: ");
4096                         pf_print_state(*state);
4097                         pf_print_flags(th->th_flags);
4098                         kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4099                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len,
4100                             ackskew, (unsigned long long)(*state)->packets[0],
4101                             (unsigned long long)(*state)->packets[1],
4102                             pd->dir == PF_IN ? "in" : "out",
4103                             pd->dir == (*state)->direction ? "fwd" : "rev");
4104                 }
4105
4106                 if (dst->scrub || src->scrub) {
4107                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4108                             *state, src, dst, copyback))
4109                                 return (PF_DROP);
4110                 }
4111
4112                 /* update max window */
4113                 if (src->max_win < win)
4114                         src->max_win = win;
4115                 /* synchronize sequencing */
4116                 if (SEQ_GT(end, src->seqlo))
4117                         src->seqlo = end;
4118                 /* slide the window of what the other end can send */
4119                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4120                         dst->seqhi = ack + MAX((win << sws), 1);
4121
4122                 /*
4123                  * Cannot set dst->seqhi here since this could be a shotgunned
4124                  * SYN and not an already established connection.
4125                  */
4126
4127                 if (th->th_flags & TH_FIN)
4128                         if (src->state < TCPS_CLOSING)
4129                                 src->state = TCPS_CLOSING;
4130                 if (th->th_flags & TH_RST)
4131                         src->state = dst->state = TCPS_TIME_WAIT;
4132
4133                 /* Fall through to PASS packet */
4134
4135         } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY ||
4136                     ((*state)->pickup_mode == PF_PICKUPS_ENABLED &&
4137                      ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) !=
4138                       PFSTATE_GOT_SYN_MASK)) {
4139                 /*
4140                  * If pickup mode is hash only, do not fail on sequence checks.
4141                  *
4142                  * If pickup mode is enabled and we did not see the SYN in
4143                  * both direction, do not fail on sequence checks because
4144                  * we do not have complete information on window scale.
4145                  *
4146                  * Adjust expiration and fall through to PASS packet.
4147                  * XXX Add a FIN check to reduce timeout?
4148                  */
4149                 (*state)->expire = time_second;
4150         } else  {
4151                 /*
4152                  * Failure processing
4153                  */
4154                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4155                     (*state)->src.state == TCPS_SYN_SENT) {
4156                         /* Send RST for state mismatches during handshake */
4157                         if (!(th->th_flags & TH_RST))
4158                                 pf_send_tcp((*state)->rule.ptr, pd->af,
4159                                     pd->dst, pd->src, th->th_dport,
4160                                     th->th_sport, ntohl(th->th_ack), 0,
4161                                     TH_RST, 0, 0,
4162                                     (*state)->rule.ptr->return_ttl, 1, 0,
4163                                     pd->eh, kif->pfik_ifp);
4164                         src->seqlo = 0;
4165                         src->seqhi = 1;
4166                         src->max_win = 1;
4167                 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4168                         kprintf("pf: BAD state: ");
4169                         pf_print_state(*state);
4170                         pf_print_flags(th->th_flags);
4171                         kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4172                             "pkts=%llu:%llu dir=%s,%s\n",
4173                             seq, orig_seq, ack, pd->p_len, ackskew,
4174                             (unsigned long long)(*state)->packets[0],
4175                                 (unsigned long long)(*state)->packets[1],
4176                             pd->dir == PF_IN ? "in" : "out",
4177                             pd->dir == (*state)->direction ? "fwd" : "rev");
4178                         kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4179                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4180                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4181                             ' ': '2',
4182                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4183                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4184                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4185                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4186                 }
4187                 REASON_SET(reason, PFRES_BADSTATE);
4188                 return (PF_DROP);
4189         }
4190
4191         return (PF_PASS);
4192 }
4193
4194 int
4195 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4196         struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4197 {
4198         struct tcphdr           *th = pd->hdr.tcp;
4199
4200         if (th->th_flags & TH_SYN)
4201                 if (src->state < TCPS_SYN_SENT)
4202                         src->state = TCPS_SYN_SENT;
4203         if (th->th_flags & TH_FIN)
4204                 if (src->state < TCPS_CLOSING)
4205                         src->state = TCPS_CLOSING;
4206         if (th->th_flags & TH_ACK) {
4207                 if (dst->state == TCPS_SYN_SENT) {
4208                         dst->state = TCPS_ESTABLISHED;
4209                         if (src->state == TCPS_ESTABLISHED &&
4210                             (*state)->src_node != NULL &&
4211                             pf_src_connlimit(state)) {
4212                                 REASON_SET(reason, PFRES_SRCLIMIT);
4213                                 return (PF_DROP);
4214                         }
4215                 } else if (dst->state == TCPS_CLOSING) {
4216                         dst->state = TCPS_FIN_WAIT_2;
4217                 } else if (src->state == TCPS_SYN_SENT &&
4218                     dst->state < TCPS_SYN_SENT) {
4219                         /*
4220                          * Handle a special sloppy case where we only see one
4221                          * half of the connection. If there is a ACK after
4222                          * the initial SYN without ever seeing a packet from
4223                          * the destination, set the connection to established.
4224                          */
4225                         dst->state = src->state = TCPS_ESTABLISHED;
4226                         if ((*state)->src_node != NULL &&
4227                             pf_src_connlimit(state)) {
4228                                 REASON_SET(reason, PFRES_SRCLIMIT);
4229                                 return (PF_DROP);
4230                         }
4231                 } else if (src->state == TCPS_CLOSING &&
4232                     dst->state == TCPS_ESTABLISHED &&
4233                     dst->seqlo == 0) {
4234                         /*
4235                          * Handle the closing of half connections where we
4236                          * don't see the full bidirectional FIN/ACK+ACK
4237                          * handshake.
4238                          */
4239                         dst->state = TCPS_CLOSING;
4240                 }
4241         }
4242         if (th->th_flags & TH_RST)
4243                 src->state = dst->state = TCPS_TIME_WAIT;
4244
4245         /* update expire time */
4246         (*state)->expire = time_second;
4247         if (src->state >= TCPS_FIN_WAIT_2 &&
4248             dst->state >= TCPS_FIN_WAIT_2)
4249                 (*state)->timeout = PFTM_TCP_CLOSED;
4250         else if (src->state >= TCPS_CLOSING &&
4251             dst->state >= TCPS_CLOSING)
4252                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4253         else if (src->state < TCPS_ESTABLISHED ||
4254             dst->state < TCPS_ESTABLISHED)
4255                 (*state)->timeout = PFTM_TCP_OPENING;
4256         else if (src->state >= TCPS_CLOSING ||
4257             dst->state >= TCPS_CLOSING)
4258                 (*state)->timeout = PFTM_TCP_CLOSING;
4259         else
4260                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4261
4262         return (PF_PASS);
4263 }
4264
4265 int
4266 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4267     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4268     u_short *reason)
4269 {
4270         struct pf_state_key_cmp  key;
4271         struct tcphdr           *th = pd->hdr.tcp;
4272         int                      copyback = 0;
4273         struct pf_state_peer    *src, *dst;
4274         struct pf_state_key     *sk;
4275
4276         key.af = pd->af;
4277         key.proto = IPPROTO_TCP;
4278         if (direction == PF_IN) {       /* wire side, straight */
4279                 PF_ACPY(&key.addr[0], pd->src, key.af);
4280                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4281                 key.port[0] = th->th_sport;
4282                 key.port[1] = th->th_dport;
4283         } else {                        /* stack side, reverse */
4284                 PF_ACPY(&key.addr[1], pd->src, key.af);
4285                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4286                 key.port[1] = th->th_sport;
4287                 key.port[0] = th->th_dport;
4288         }
4289
4290         STATE_LOOKUP(kif, &key, direction, *state, m);
4291
4292         if (direction == (*state)->direction) {
4293                 src = &(*state)->src;
4294                 dst = &(*state)->dst;
4295         } else {
4296                 src = &(*state)->dst;
4297                 dst = &(*state)->src;
4298         }
4299
4300         sk = (*state)->key[pd->didx];
4301
4302         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4303                 if (direction != (*state)->direction) {
4304                         REASON_SET(reason, PFRES_SYNPROXY);
4305                         return (PF_SYNPROXY_DROP);
4306                 }
4307                 if (th->th_flags & TH_SYN) {
4308                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4309                                 REASON_SET(reason, PFRES_SYNPROXY);
4310                                 return (PF_DROP);
4311                         }
4312                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4313                             pd->src, th->th_dport, th->th_sport,
4314                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4315                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
4316                             0, NULL, NULL);
4317                         REASON_SET(reason, PFRES_SYNPROXY);
4318                         return (PF_SYNPROXY_DROP);
4319                 } else if (!(th->th_flags & TH_ACK) ||
4320                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4321                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4322                         REASON_SET(reason, PFRES_SYNPROXY);
4323                         return (PF_DROP);
4324                 } else if ((*state)->src_node != NULL &&
4325                     pf_src_connlimit(state)) {
4326                         REASON_SET(reason, PFRES_SRCLIMIT);
4327                         return (PF_DROP);
4328                 } else
4329                         (*state)->src.state = PF_TCPS_PROXY_DST;
4330         }
4331         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4332                 if (direction == (*state)->direction) {
4333                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4334                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4335                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4336                                 REASON_SET(reason, PFRES_SYNPROXY);
4337                                 return (PF_DROP);
4338                         }
4339                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4340                         if ((*state)->dst.seqhi == 1)
4341                                 (*state)->dst.seqhi = htonl(karc4random());
4342                         pf_send_tcp((*state)->rule.ptr, pd->af,
4343                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4344                             sk->port[pd->sidx], sk->port[pd->didx],
4345                             (*state)->dst.seqhi, 0, TH_SYN, 0,
4346                             (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
4347                         REASON_SET(reason, PFRES_SYNPROXY);
4348                         return (PF_SYNPROXY_DROP);
4349                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4350                     (TH_SYN|TH_ACK)) ||
4351                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4352                         REASON_SET(reason, PFRES_SYNPROXY);
4353                         return (PF_DROP);
4354                 } else {
4355                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4356                         (*state)->dst.seqlo = ntohl(th->th_seq);
4357                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4358                             pd->src, th->th_dport, th->th_sport,
4359                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4360                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
4361                             (*state)->tag, NULL, NULL);
4362                         pf_send_tcp((*state)->rule.ptr, pd->af,
4363                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4364                             sk->port[pd->sidx], sk->port[pd->didx],
4365                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4366                             TH_ACK, (*state)->dst.max_win, 0, 0, 1,
4367                             0, NULL, NULL);
4368                         (*state)->src.seqdiff = (*state)->dst.seqhi -
4369                             (*state)->src.seqlo;
4370                         (*state)->dst.seqdiff = (*state)->src.seqhi -
4371                             (*state)->dst.seqlo;
4372                         (*state)->src.seqhi = (*state)->src.seqlo +
4373                             (*state)->dst.max_win;
4374                         (*state)->dst.seqhi = (*state)->dst.seqlo +
4375                             (*state)->src.max_win;
4376                         (*state)->src.wscale = (*state)->dst.wscale = 0;
4377                         (*state)->src.state = (*state)->dst.state =
4378                             TCPS_ESTABLISHED;
4379                         REASON_SET(reason, PFRES_SYNPROXY);
4380                         return (PF_SYNPROXY_DROP);
4381                 }
4382         }
4383
4384         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4385             dst->state >= TCPS_FIN_WAIT_2 &&
4386             src->state >= TCPS_FIN_WAIT_2) {
4387                 if (pf_status.debug >= PF_DEBUG_MISC) {
4388                         kprintf("pf: state reuse ");
4389                         pf_print_state(*state);
4390                         pf_print_flags(th->th_flags);
4391                         kprintf("\n");
4392                 }
4393                 /* XXX make sure it's the same direction ?? */
4394                 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4395                 pf_unlink_state(*state);
4396                 *state = NULL;
4397                 return (PF_DROP);
4398         }
4399
4400         if ((*state)->state_flags & PFSTATE_SLOPPY) {
4401                 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4402                         return (PF_DROP);
4403         } else {
4404                 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4405                     &copyback) == PF_DROP)
4406                         return (PF_DROP);
4407         }
4408
4409         /* translate source/destination address, if necessary */
4410         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4411                 struct pf_state_key *nk = (*state)->key[pd->didx];
4412
4413                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4414                     nk->port[pd->sidx] != th->th_sport)
4415                         pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4416                             &th->th_sum, &nk->addr[pd->sidx],
4417                             nk->port[pd->sidx], 0, pd->af);
4418
4419                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4420                     nk->port[pd->didx] != th->th_dport) {
4421                         /*
4422                          * If we don't redispatch the packet will go into
4423                          * the protocol stack on the wrong cpu for the
4424                          * post-translated address.
4425                          */
4426                         m->m_flags &= ~M_HASH;
4427                         pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4428                             &th->th_sum, &nk->addr[pd->didx],
4429                             nk->port[pd->didx], 0, pd->af);
4430                 }
4431                 copyback = 1;
4432         }
4433
4434         /* Copyback sequence modulation or stateful scrub changes if needed */
4435         if (copyback)
4436                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4437
4438         return (PF_PASS);
4439 }
4440
4441 int
4442 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4443     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4444 {
4445         struct pf_state_peer    *src, *dst;
4446         struct pf_state_key_cmp  key;
4447         struct udphdr           *uh = pd->hdr.udp;
4448
4449         key.af = pd->af;
4450         key.proto = IPPROTO_UDP;
4451         if (direction == PF_IN) {       /* wire side, straight */
4452                 PF_ACPY(&key.addr[0], pd->src, key.af);
4453                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4454                 key.port[0] = uh->uh_sport;
4455                 key.port[1] = uh->uh_dport;
4456         } else {                        /* stack side, reverse */
4457                 PF_ACPY(&key.addr[1], pd->src, key.af);
4458                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4459                 key.port[1] = uh->uh_sport;
4460                 key.port[0] = uh->uh_dport;
4461         }
4462
4463         STATE_LOOKUP(kif, &key, direction, *state, m);
4464
4465         if (direction == (*state)->direction) {
4466                 src = &(*state)->src;
4467                 dst = &(*state)->dst;
4468         } else {
4469                 src = &(*state)->dst;
4470                 dst = &(*state)->src;
4471         }
4472
4473         /* update states */
4474         if (src->state < PFUDPS_SINGLE)
4475                 src->state = PFUDPS_SINGLE;
4476         if (dst->state == PFUDPS_SINGLE)
4477                 dst->state = PFUDPS_MULTIPLE;
4478
4479         /* update expire time */
4480         (*state)->expire = time_second;
4481         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4482                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4483         else
4484                 (*state)->timeout = PFTM_UDP_SINGLE;
4485
4486         /* translate source/destination address, if necessary */
4487         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4488                 struct pf_state_key *nk = (*state)->key[pd->didx];
4489
4490                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4491                     nk->port[pd->sidx] != uh->uh_sport)
4492                         pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4493                             &uh->uh_sum, &nk->addr[pd->sidx],
4494                             nk->port[pd->sidx], 1, pd->af);
4495
4496                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4497                     nk->port[pd->didx] != uh->uh_dport) {
4498                         /*
4499                          * If we don't redispatch the packet will go into
4500                          * the protocol stack on the wrong cpu for the
4501                          * post-translated address.
4502                          */
4503                         m->m_flags &= ~M_HASH;
4504                         pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4505                             &uh->uh_sum, &nk->addr[pd->didx],
4506                             nk->port[pd->didx], 1, pd->af);
4507                 }
4508                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4509         }
4510
4511         return (PF_PASS);
4512 }
4513
4514 int
4515 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4516     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4517 {
4518         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4519         u_int16_t        icmpid = 0, *icmpsum;
4520         u_int8_t         icmptype;
4521         int              state_icmp = 0;
4522         struct pf_state_key_cmp key;
4523
4524         switch (pd->proto) {
4525 #ifdef INET
4526         case IPPROTO_ICMP:
4527                 icmptype = pd->hdr.icmp->icmp_type;
4528                 icmpid = pd->hdr.icmp->icmp_id;
4529                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4530
4531                 if (icmptype == ICMP_UNREACH ||
4532                     icmptype == ICMP_SOURCEQUENCH ||
4533                     icmptype == ICMP_REDIRECT ||
4534                     icmptype == ICMP_TIMXCEED ||
4535                     icmptype == ICMP_PARAMPROB)
4536                         state_icmp++;
4537                 break;
4538 #endif /* INET */
4539 #ifdef INET6
4540         case IPPROTO_ICMPV6:
4541                 icmptype = pd->hdr.icmp6->icmp6_type;
4542                 icmpid = pd->hdr.icmp6->icmp6_id;
4543                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4544
4545                 if (icmptype == ICMP6_DST_UNREACH ||
4546                     icmptype == ICMP6_PACKET_TOO_BIG ||
4547                     icmptype == ICMP6_TIME_EXCEEDED ||
4548                     icmptype == ICMP6_PARAM_PROB)
4549                         state_icmp++;
4550                 break;
4551 #endif /* INET6 */
4552         }
4553
4554         if (!state_icmp) {
4555
4556                 /*
4557                  * ICMP query/reply message not related to a TCP/UDP packet.
4558                  * Search for an ICMP state.
4559                  */
4560                 key.af = pd->af;
4561                 key.proto = pd->proto;
4562                 key.port[0] = key.port[1] = icmpid;
4563                 if (direction == PF_IN) {       /* wire side, straight */
4564                         PF_ACPY(&key.addr[0], pd->src, key.af);
4565                         PF_ACPY(&key.addr[1], pd->dst, key.af);
4566                 } else {                        /* stack side, reverse */
4567                         PF_ACPY(&key.addr[1], pd->src, key.af);
4568                         PF_ACPY(&key.addr[0], pd->dst, key.af);
4569                 }
4570
4571                 STATE_LOOKUP(kif, &key, direction, *state, m);
4572
4573                 (*state)->expire = time_second;
4574                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4575
4576                 /* translate source/destination address, if necessary */
4577                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4578                         struct pf_state_key *nk = (*state)->key[pd->didx];
4579
4580                         switch (pd->af) {
4581 #ifdef INET
4582                         case AF_INET:
4583                                 if (PF_ANEQ(pd->src,
4584                                     &nk->addr[pd->sidx], AF_INET))
4585                                         pf_change_a(&saddr->v4.s_addr,
4586                                             pd->ip_sum,
4587                                             nk->addr[pd->sidx].v4.s_addr, 0);
4588
4589                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4590                                     AF_INET))
4591                                         pf_change_a(&daddr->v4.s_addr,
4592                                             pd->ip_sum,
4593                                             nk->addr[pd->didx].v4.s_addr, 0);
4594
4595                                 if (nk->port[0] !=
4596                                     pd->hdr.icmp->icmp_id) {
4597                                         pd->hdr.icmp->icmp_cksum =
4598                                             pf_cksum_fixup(
4599                                             pd->hdr.icmp->icmp_cksum, icmpid,
4600                                             nk->port[pd->sidx], 0);
4601                                         pd->hdr.icmp->icmp_id =
4602                                             nk->port[pd->sidx];
4603                                 }
4604
4605                                 m_copyback(m, off, ICMP_MINLEN,
4606                                     (caddr_t)pd->hdr.icmp);
4607                                 break;
4608 #endif /* INET */
4609 #ifdef INET6
4610                         case AF_INET6:
4611                                 if (PF_ANEQ(pd->src,
4612                                     &nk->addr[pd->sidx], AF_INET6))
4613                                         pf_change_a6(saddr,
4614                                             &pd->hdr.icmp6->icmp6_cksum,
4615                                             &nk->addr[pd->sidx], 0);
4616
4617                                 if (PF_ANEQ(pd->dst,
4618                                     &nk->addr[pd->didx], AF_INET6))
4619                                         pf_change_a6(daddr,
4620                                             &pd->hdr.icmp6->icmp6_cksum,
4621                                             &nk->addr[pd->didx], 0);
4622
4623                                 m_copyback(m, off,
4624                                         sizeof(struct icmp6_hdr),
4625                                         (caddr_t)pd->hdr.icmp6);
4626                                 break;
4627 #endif /* INET6 */
4628                         }
4629                 }
4630                 return (PF_PASS);
4631
4632         } else {
4633                 /*
4634                  * ICMP error message in response to a TCP/UDP packet.
4635                  * Extract the inner TCP/UDP header and search for that state.
4636                  */
4637
4638                 struct pf_pdesc pd2;
4639 #ifdef INET
4640                 struct ip       h2;
4641 #endif /* INET */
4642 #ifdef INET6
4643                 struct ip6_hdr  h2_6;
4644                 int             terminal = 0;
4645 #endif /* INET6 */
4646                 int             ipoff2;
4647                 int             off2;
4648
4649                 pd2.af = pd->af;
4650                 /* Payload packet is from the opposite direction. */
4651                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
4652                 pd2.didx = (direction == PF_IN) ? 0 : 1;
4653                 switch (pd->af) {
4654 #ifdef INET
4655                 case AF_INET:
4656                         /* offset of h2 in mbuf chain */
4657                         ipoff2 = off + ICMP_MINLEN;
4658
4659                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4660                             NULL, reason, pd2.af)) {
4661                                 DPFPRINTF(PF_DEBUG_MISC,
4662                                     ("pf: ICMP error message too short "
4663                                     "(ip)\n"));
4664                                 return (PF_DROP);
4665                         }
4666                         /*
4667                          * ICMP error messages don't refer to non-first
4668                          * fragments
4669                          */
4670                         if (h2.ip_off & htons(IP_OFFMASK)) {
4671                                 REASON_SET(reason, PFRES_FRAG);
4672                                 return (PF_DROP);
4673                         }
4674
4675                         /* offset of protocol header that follows h2 */
4676                         off2 = ipoff2 + (h2.ip_hl << 2);
4677
4678                         pd2.proto = h2.ip_p;
4679                         pd2.src = (struct pf_addr *)&h2.ip_src;
4680                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4681                         pd2.ip_sum = &h2.ip_sum;
4682                         break;
4683 #endif /* INET */
4684 #ifdef INET6
4685                 case AF_INET6:
4686                         ipoff2 = off + sizeof(struct icmp6_hdr);
4687
4688                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4689                             NULL, reason, pd2.af)) {
4690                                 DPFPRINTF(PF_DEBUG_MISC,
4691                                     ("pf: ICMP error message too short "
4692                                     "(ip6)\n"));
4693                                 return (PF_DROP);
4694                         }
4695                         pd2.proto = h2_6.ip6_nxt;
4696                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4697                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4698                         pd2.ip_sum = NULL;
4699                         off2 = ipoff2 + sizeof(h2_6);
4700                         do {
4701                                 switch (pd2.proto) {
4702                                 case IPPROTO_FRAGMENT:
4703                                         /*
4704                                          * ICMPv6 error messages for
4705                                          * non-first fragments
4706                                          */
4707                                         REASON_SET(reason, PFRES_FRAG);
4708                                         return (PF_DROP);
4709                                 case IPPROTO_AH:
4710                                 case IPPROTO_HOPOPTS:
4711                                 case IPPROTO_ROUTING:
4712                                 case IPPROTO_DSTOPTS: {
4713                                         /* get next header and header length */
4714                                         struct ip6_ext opt6;
4715
4716                                         if (!pf_pull_hdr(m, off2, &opt6,
4717                                             sizeof(opt6), NULL, reason,
4718                                             pd2.af)) {
4719                                                 DPFPRINTF(PF_DEBUG_MISC,
4720                                                     ("pf: ICMPv6 short opt\n"));
4721                                                 return (PF_DROP);
4722                                         }
4723                                         if (pd2.proto == IPPROTO_AH)
4724                                                 off2 += (opt6.ip6e_len + 2) * 4;
4725                                         else
4726                                                 off2 += (opt6.ip6e_len + 1) * 8;
4727                                         pd2.proto = opt6.ip6e_nxt;
4728                                         /* goto the next header */
4729                                         break;
4730                                 }
4731                                 default:
4732                                         terminal++;
4733                                         break;
4734                                 }
4735                         } while (!terminal);
4736                         break;
4737 #endif /* INET6 */
4738                 default:
4739                         DPFPRINTF(PF_DEBUG_MISC,
4740                             ("pf: ICMP AF %d unknown (ip6)\n", pd->af));
4741                         return (PF_DROP);
4742                         break;
4743                 }
4744
4745                 switch (pd2.proto) {
4746                 case IPPROTO_TCP: {
4747                         struct tcphdr            th;
4748                         u_int32_t                seq;
4749                         struct pf_state_peer    *src, *dst;
4750                         u_int8_t                 dws;
4751                         int                      copyback = 0;
4752
4753                         /*
4754                          * Only the first 8 bytes of the TCP header can be
4755                          * expected. Don't access any TCP header fields after
4756                          * th_seq, an ackskew test is not possible.
4757                          */
4758                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4759                             pd2.af)) {
4760                                 DPFPRINTF(PF_DEBUG_MISC,
4761                                     ("pf: ICMP error message too short "
4762                                     "(tcp)\n"));
4763                                 return (PF_DROP);
4764                         }
4765
4766                         key.af = pd2.af;
4767                         key.proto = IPPROTO_TCP;
4768                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4769                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4770                         key.port[pd2.sidx] = th.th_sport;
4771                         key.port[pd2.didx] = th.th_dport;
4772
4773                         STATE_LOOKUP(kif, &key, direction, *state, m);
4774
4775                         if (direction == (*state)->direction) {
4776                                 src = &(*state)->dst;
4777                                 dst = &(*state)->src;
4778                         } else {
4779                                 src = &(*state)->src;
4780                                 dst = &(*state)->dst;
4781                         }
4782
4783                         if (src->wscale && dst->wscale)
4784                                 dws = dst->wscale & PF_WSCALE_MASK;
4785                         else
4786                                 dws = 0;
4787
4788                         /* Demodulate sequence number */
4789                         seq = ntohl(th.th_seq) - src->seqdiff;
4790                         if (src->seqdiff) {
4791                                 pf_change_a(&th.th_seq, icmpsum,
4792                                     htonl(seq), 0);
4793                                 copyback = 1;
4794                         }
4795
4796                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4797                             (!SEQ_GEQ(src->seqhi, seq) ||
4798                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4799                                 if (pf_status.debug >= PF_DEBUG_MISC) {
4800                                         kprintf("pf: BAD ICMP %d:%d ",
4801                                             icmptype, pd->hdr.icmp->icmp_code);
4802                                         pf_print_host(pd->src, 0, pd->af);
4803                                         kprintf(" -> ");
4804                                         pf_print_host(pd->dst, 0, pd->af);
4805                                         kprintf(" state: ");
4806                                         pf_print_state(*state);
4807                                         kprintf(" seq=%u\n", seq);
4808                                 }
4809                                 REASON_SET(reason, PFRES_BADSTATE);
4810                                 return (PF_DROP);
4811                         } else {
4812                                 if (pf_status.debug >= PF_DEBUG_MISC) {
4813                                         kprintf("pf: OK ICMP %d:%d ",
4814                                             icmptype, pd->hdr.icmp->icmp_code);
4815                                         pf_print_host(pd->src, 0, pd->af);
4816                                         kprintf(" -> ");
4817                                         pf_print_host(pd->dst, 0, pd->af);
4818                                         kprintf(" state: ");
4819                                         pf_print_state(*state);
4820                                         kprintf(" seq=%u\n", seq);
4821                                 }
4822                         }
4823
4824                         /* translate source/destination address, if necessary */
4825                         if ((*state)->key[PF_SK_WIRE] !=
4826                             (*state)->key[PF_SK_STACK]) {
4827                                 struct pf_state_key *nk =
4828                                     (*state)->key[pd->didx];
4829
4830                                 if (PF_ANEQ(pd2.src,
4831                                     &nk->addr[pd2.sidx], pd2.af) ||
4832                                     nk->port[pd2.sidx] != th.th_sport)
4833                                         pf_change_icmp(pd2.src, &th.th_sport,
4834                                             daddr, &nk->addr[pd2.sidx],
4835                                             nk->port[pd2.sidx], NULL,
4836                                             pd2.ip_sum, icmpsum,
4837                                             pd->ip_sum, 0, pd2.af);
4838
4839                                 if (PF_ANEQ(pd2.dst,
4840                                     &nk->addr[pd2.didx], pd2.af) ||
4841                                     nk->port[pd2.didx] != th.th_dport)
4842                                         pf_change_icmp(pd2.dst, &th.th_dport,
4843                                             NULL, /* XXX Inbound NAT? */
4844                                             &nk->addr[pd2.didx],
4845                                             nk->port[pd2.didx], NULL,
4846                                             pd2.ip_sum, icmpsum,
4847                                             pd->ip_sum, 0, pd2.af);
4848                                 copyback = 1;
4849                         }
4850
4851                         if (copyback) {
4852                                 switch (pd2.af) {
4853 #ifdef INET
4854                                 case AF_INET:
4855                                         m_copyback(m, off, ICMP_MINLEN,
4856                                             (caddr_t)pd->hdr.icmp);
4857                                         m_copyback(m, ipoff2, sizeof(h2),
4858                                             (caddr_t)&h2);
4859                                         break;
4860 #endif /* INET */
4861 #ifdef INET6
4862                                 case AF_INET6:
4863                                         m_copyback(m, off,
4864                                             sizeof(struct icmp6_hdr),
4865                                             (caddr_t)pd->hdr.icmp6);
4866                                         m_copyback(m, ipoff2, sizeof(h2_6),
4867                                             (caddr_t)&h2_6);
4868                                         break;
4869 #endif /* INET6 */
4870                                 }
4871                                 m_copyback(m, off2, 8, (caddr_t)&th);
4872                         }
4873
4874                         return (PF_PASS);
4875                         break;
4876                 }
4877                 case IPPROTO_UDP: {
4878                         struct udphdr           uh;
4879
4880                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4881                             NULL, reason, pd2.af)) {
4882                                 DPFPRINTF(PF_DEBUG_MISC,
4883                                     ("pf: ICMP error message too short "
4884                                     "(udp)\n"));
4885                                 return (PF_DROP);
4886                         }
4887
4888                         key.af = pd2.af;
4889                         key.proto = IPPROTO_UDP;
4890                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4891                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4892                         key.port[pd2.sidx] = uh.uh_sport;
4893                         key.port[pd2.didx] = uh.uh_dport;
4894
4895                         STATE_LOOKUP(kif, &key, direction, *state, m);
4896
4897                         /* translate source/destination address, if necessary */
4898                         if ((*state)->key[PF_SK_WIRE] !=
4899                             (*state)->key[PF_SK_STACK]) {
4900                                 struct pf_state_key *nk =
4901                                     (*state)->key[pd->didx];
4902
4903                                 if (PF_ANEQ(pd2.src,
4904                                     &nk->addr[pd2.sidx], pd2.af) ||
4905                                     nk->port[pd2.sidx] != uh.uh_sport)
4906                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4907                                             daddr, &nk->addr[pd2.sidx],
4908                                             nk->port[pd2.sidx], &uh.uh_sum,
4909                                             pd2.ip_sum, icmpsum,
4910                                             pd->ip_sum, 1, pd2.af);
4911
4912                                 if (PF_ANEQ(pd2.dst,
4913                                     &nk->addr[pd2.didx], pd2.af) ||
4914                                     nk->port[pd2.didx] != uh.uh_dport)
4915                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4916                                             NULL, /* XXX Inbound NAT? */
4917                                             &nk->addr[pd2.didx],
4918                                             nk->port[pd2.didx], &uh.uh_sum,
4919                                             pd2.ip_sum, icmpsum,
4920                                             pd->ip_sum, 1, pd2.af);
4921
4922                                 switch (pd2.af) {
4923 #ifdef INET
4924                                 case AF_INET:
4925                                         m_copyback(m, off, ICMP_MINLEN,
4926                                             (caddr_t)pd->hdr.icmp);
4927                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4928                                         break;
4929 #endif /* INET */
4930 #ifdef INET6
4931                                 case AF_INET6:
4932                                         m_copyback(m, off,
4933                                             sizeof(struct icmp6_hdr),
4934                                             (caddr_t)pd->hdr.icmp6);
4935                                         m_copyback(m, ipoff2, sizeof(h2_6),
4936                                             (caddr_t)&h2_6);
4937                                         break;
4938 #endif /* INET6 */
4939                                 }
4940                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4941                         }
4942
4943                         return (PF_PASS);
4944                         break;
4945                 }
4946 #ifdef INET
4947                 case IPPROTO_ICMP: {
4948                         struct icmp             iih;
4949
4950                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4951                             NULL, reason, pd2.af)) {
4952                                 DPFPRINTF(PF_DEBUG_MISC,
4953                                     ("pf: ICMP error message too short i"
4954                                     "(icmp)\n"));
4955                                 return (PF_DROP);
4956                         }
4957
4958                         key.af = pd2.af;
4959                         key.proto = IPPROTO_ICMP;
4960                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4961                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4962                         key.port[0] = key.port[1] = iih.icmp_id;
4963
4964                         STATE_LOOKUP(kif, &key, direction, *state, m);
4965
4966                         /* translate source/destination address, if necessary */
4967                         if ((*state)->key[PF_SK_WIRE] !=
4968                             (*state)->key[PF_SK_STACK]) {
4969                                 struct pf_state_key *nk =
4970                                     (*state)->key[pd->didx];
4971
4972                                 if (PF_ANEQ(pd2.src,
4973                                     &nk->addr[pd2.sidx], pd2.af) ||
4974                                     nk->port[pd2.sidx] != iih.icmp_id)
4975                                         pf_change_icmp(pd2.src, &iih.icmp_id,
4976                                             daddr, &nk->addr[pd2.sidx],
4977                                             nk->port[pd2.sidx], NULL,
4978                                             pd2.ip_sum, icmpsum,
4979                                             pd->ip_sum, 0, AF_INET);
4980
4981                                 if (PF_ANEQ(pd2.dst,
4982                                     &nk->addr[pd2.didx], pd2.af) ||
4983                                     nk->port[pd2.didx] != iih.icmp_id)
4984                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
4985                                             NULL, /* XXX Inbound NAT? */
4986                                             &nk->addr[pd2.didx],
4987                                             nk->port[pd2.didx], NULL,
4988                                             pd2.ip_sum, icmpsum,
4989                                             pd->ip_sum, 0, AF_INET);
4990
4991                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
4992                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4993                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
4994                         }
4995                         return (PF_PASS);
4996                         break;
4997                 }
4998 #endif /* INET */
4999 #ifdef INET6
5000                 case IPPROTO_ICMPV6: {
5001                         struct icmp6_hdr        iih;
5002
5003                         if (!pf_pull_hdr(m, off2, &iih,
5004                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5005                                 DPFPRINTF(PF_DEBUG_MISC,
5006                                     ("pf: ICMP error message too short "
5007                                     "(icmp6)\n"));
5008                                 return (PF_DROP);
5009                         }
5010
5011                         key.af = pd2.af;
5012                         key.proto = IPPROTO_ICMPV6;
5013                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5014                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5015                         key.port[0] = key.port[1] = iih.icmp6_id;
5016
5017                         STATE_LOOKUP(kif, &key, direction, *state, m);
5018
5019                         /* translate source/destination address, if necessary */
5020                         if ((*state)->key[PF_SK_WIRE] !=
5021                             (*state)->key[PF_SK_STACK]) {
5022                                 struct pf_state_key *nk =
5023                                     (*state)->key[pd->didx];
5024
5025                                 if (PF_ANEQ(pd2.src,
5026                                     &nk->addr[pd2.sidx], pd2.af) ||
5027                                     nk->port[pd2.sidx] != iih.icmp6_id)
5028                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
5029                                             daddr, &nk->addr[pd2.sidx],
5030                                             nk->port[pd2.sidx], NULL,
5031                                             pd2.ip_sum, icmpsum,
5032                                             pd->ip_sum, 0, AF_INET6);
5033
5034                                 if (PF_ANEQ(pd2.dst,
5035                                     &nk->addr[pd2.didx], pd2.af) ||
5036                                     nk->port[pd2.didx] != iih.icmp6_id)
5037                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
5038                                             NULL, /* XXX Inbound NAT? */
5039                                             &nk->addr[pd2.didx],
5040                                             nk->port[pd2.didx], NULL,
5041                                             pd2.ip_sum, icmpsum,
5042                                             pd->ip_sum, 0, AF_INET6);
5043
5044                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
5045                                     (caddr_t)pd->hdr.icmp6);
5046                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5047                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5048                                     (caddr_t)&iih);
5049                         }
5050
5051                         return (PF_PASS);
5052                         break;
5053                 }
5054 #endif /* INET6 */
5055                 default: {
5056                         key.af = pd2.af;
5057                         key.proto = pd2.proto;
5058                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5059                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5060                         key.port[0] = key.port[1] = 0;
5061
5062                         STATE_LOOKUP(kif, &key, direction, *state, m);
5063
5064                         /* translate source/destination address, if necessary */
5065                         if ((*state)->key[PF_SK_WIRE] !=
5066                             (*state)->key[PF_SK_STACK]) {
5067                                 struct pf_state_key *nk =
5068                                     (*state)->key[pd->didx];
5069
5070                                 if (PF_ANEQ(pd2.src,
5071                                     &nk->addr[pd2.sidx], pd2.af))
5072                                         pf_change_icmp(pd2.src, NULL, daddr,
5073                                             &nk->addr[pd2.sidx], 0, NULL,
5074                                             pd2.ip_sum, icmpsum,
5075                                             pd->ip_sum, 0, pd2.af);
5076
5077                                 if (PF_ANEQ(pd2.dst,
5078                                     &nk->addr[pd2.didx], pd2.af))
5079                                         pf_change_icmp(pd2.src, NULL,
5080                                             NULL, /* XXX Inbound NAT? */
5081                                             &nk->addr[pd2.didx], 0, NULL,
5082                                             pd2.ip_sum, icmpsum,
5083                                             pd->ip_sum, 0, pd2.af);
5084
5085                                 switch (pd2.af) {
5086 #ifdef INET
5087                                 case AF_INET:
5088                                         m_copyback(m, off, ICMP_MINLEN,
5089                                             (caddr_t)pd->hdr.icmp);
5090                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5091                                         break;
5092 #endif /* INET */
5093 #ifdef INET6
5094                                 case AF_INET6:
5095                                         m_copyback(m, off,
5096                                             sizeof(struct icmp6_hdr),
5097                                             (caddr_t)pd->hdr.icmp6);
5098                                         m_copyback(m, ipoff2, sizeof(h2_6),
5099                                             (caddr_t)&h2_6);
5100                                         break;
5101 #endif /* INET6 */
5102                                 }
5103                         }
5104                         return (PF_PASS);
5105                         break;
5106                 }
5107                 }
5108         }
5109 }
5110
5111 int
5112 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5113     struct mbuf *m, struct pf_pdesc *pd)
5114 {
5115         struct pf_state_peer    *src, *dst;
5116         struct pf_state_key_cmp  key;
5117
5118         key.af = pd->af;
5119         key.proto = pd->proto;
5120         if (direction == PF_IN) {
5121                 PF_ACPY(&key.addr[0], pd->src, key.af);
5122                 PF_ACPY(&key.addr[1], pd->dst, key.af);
5123                 key.port[0] = key.port[1] = 0;
5124         } else {
5125                 PF_ACPY(&key.addr[1], pd->src, key.af);
5126                 PF_ACPY(&key.addr[0], pd->dst, key.af);
5127                 key.port[1] = key.port[0] = 0;
5128         }
5129
5130         STATE_LOOKUP(kif, &key, direction, *state, m);
5131
5132         if (direction == (*state)->direction) {
5133                 src = &(*state)->src;
5134                 dst = &(*state)->dst;
5135         } else {
5136                 src = &(*state)->dst;
5137                 dst = &(*state)->src;
5138         }
5139
5140         /* update states */
5141         if (src->state < PFOTHERS_SINGLE)
5142                 src->state = PFOTHERS_SINGLE;
5143         if (dst->state == PFOTHERS_SINGLE)
5144                 dst->state = PFOTHERS_MULTIPLE;
5145
5146         /* update expire time */
5147         (*state)->expire = time_second;
5148         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5149                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5150         else
5151                 (*state)->timeout = PFTM_OTHER_SINGLE;
5152
5153         /* translate source/destination address, if necessary */
5154         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5155                 struct pf_state_key *nk = (*state)->key[pd->didx];
5156
5157                 KKASSERT(nk);
5158                 KKASSERT(pd);
5159                 KKASSERT(pd->src);
5160                 KKASSERT(pd->dst);
5161                 switch (pd->af) {
5162 #ifdef INET
5163                 case AF_INET:
5164                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5165                                 pf_change_a(&pd->src->v4.s_addr,
5166                                     pd->ip_sum,
5167                                     nk->addr[pd->sidx].v4.s_addr,
5168                                     0);
5169
5170
5171                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5172                                 pf_change_a(&pd->dst->v4.s_addr,
5173                                     pd->ip_sum,
5174                                     nk->addr[pd->didx].v4.s_addr,
5175                                     0);
5176
5177                                 break;
5178 #endif /* INET */
5179 #ifdef INET6
5180                 case AF_INET6:
5181                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5182                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5183
5184                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5185                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5186 #endif /* INET6 */
5187                 }
5188         }
5189         return (PF_PASS);
5190 }
5191
5192 /*
5193  * ipoff and off are measured from the start of the mbuf chain.
5194  * h must be at "ipoff" on the mbuf chain.
5195  */
5196 void *
5197 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5198     u_short *actionp, u_short *reasonp, sa_family_t af)
5199 {
5200         switch (af) {
5201 #ifdef INET
5202         case AF_INET: {
5203                 struct ip       *h = mtod(m, struct ip *);
5204                 u_int16_t        fragoff = (h->ip_off & IP_OFFMASK) << 3;
5205
5206                 if (fragoff) {
5207                         if (fragoff >= len)
5208                                 ACTION_SET(actionp, PF_PASS);
5209                         else {
5210                                 ACTION_SET(actionp, PF_DROP);
5211                                 REASON_SET(reasonp, PFRES_FRAG);
5212                         }
5213                         return (NULL);
5214                 }
5215                 if (m->m_pkthdr.len < off + len ||
5216                     h->ip_len < off + len) {
5217                         ACTION_SET(actionp, PF_DROP);
5218                         REASON_SET(reasonp, PFRES_SHORT);
5219                         return (NULL);
5220                 }
5221                 break;
5222         }
5223 #endif /* INET */
5224 #ifdef INET6
5225         case AF_INET6: {
5226                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
5227
5228                 if (m->m_pkthdr.len < off + len ||
5229                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5230                     (unsigned)(off + len)) {
5231                         ACTION_SET(actionp, PF_DROP);
5232                         REASON_SET(reasonp, PFRES_SHORT);
5233                         return (NULL);
5234                 }
5235                 break;
5236         }
5237 #endif /* INET6 */
5238         }
5239         m_copydata(m, off, len, p);
5240         return (p);
5241 }
5242
5243 int
5244 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif)
5245 {
5246         struct sockaddr_in      *dst;
5247         int                      ret = 1;
5248         int                      check_mpath;
5249 #ifdef INET6
5250         struct sockaddr_in6     *dst6;
5251         struct route_in6         ro;
5252 #else
5253         struct route             ro;
5254 #endif
5255         struct radix_node       *rn;
5256         struct rtentry          *rt;
5257         struct ifnet            *ifp;
5258
5259         check_mpath = 0;
5260         bzero(&ro, sizeof(ro));
5261         switch (af) {
5262         case AF_INET:
5263                 dst = satosin(&ro.ro_dst);
5264                 dst->sin_family = AF_INET;
5265                 dst->sin_len = sizeof(*dst);
5266                 dst->sin_addr = addr->v4;
5267                 break;
5268 #ifdef INET6
5269         case AF_INET6:
5270                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5271                 dst6->sin6_family = AF_INET6;
5272                 dst6->sin6_len = sizeof(*dst6);
5273                 dst6->sin6_addr = addr->v6;
5274                 break;
5275 #endif /* INET6 */
5276         default:
5277                 return (0);
5278         }
5279
5280         /* Skip checks for ipsec interfaces */
5281         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5282                 goto out;
5283
5284         rtalloc_ign((struct route *)&ro, 0);
5285
5286         if (ro.ro_rt != NULL) {
5287                 /* No interface given, this is a no-route check */
5288                 if (kif == NULL)
5289                         goto out;
5290
5291                 if (kif->pfik_ifp == NULL) {
5292                         ret = 0;
5293                         goto out;
5294                 }
5295
5296                 /* Perform uRPF check if passed input interface */
5297                 ret = 0;
5298                 rn = (struct radix_node *)ro.ro_rt;
5299                 do {
5300                         rt = (struct rtentry *)rn;
5301                         ifp = rt->rt_ifp;
5302
5303                         if (kif->pfik_ifp == ifp)
5304                                 ret = 1;
5305                         rn = NULL;
5306                 } while (check_mpath == 1 && rn != NULL && ret == 0);
5307         } else
5308                 ret = 0;
5309 out:
5310         if (ro.ro_rt != NULL)
5311                 RTFREE(ro.ro_rt);
5312         return (ret);
5313 }
5314
5315 int
5316 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw)
5317 {
5318         struct sockaddr_in      *dst;
5319 #ifdef INET6
5320         struct sockaddr_in6     *dst6;
5321         struct route_in6         ro;
5322 #else
5323         struct route             ro;
5324 #endif
5325         int                      ret = 0;
5326
5327         ASSERT_LWKT_TOKEN_HELD(&pf_token);
5328
5329         bzero(&ro, sizeof(ro));
5330         switch (af) {
5331         case AF_INET:
5332                 dst = satosin(&ro.ro_dst);
5333                 dst->sin_family = AF_INET;
5334                 dst->sin_len = sizeof(*dst);
5335                 dst->sin_addr = addr->v4;
5336                 break;
5337 #ifdef INET6
5338         case AF_INET6:
5339                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5340                 dst6->sin6_family = AF_INET6;
5341                 dst6->sin6_len = sizeof(*dst6);
5342                 dst6->sin6_addr = addr->v6;
5343                 break;
5344 #endif /* INET6 */
5345         default:
5346                 return (0);
5347         }
5348
5349 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING));
5350
5351         if (ro.ro_rt != NULL) {
5352                 RTFREE(ro.ro_rt);
5353         }
5354
5355         return (ret);
5356 }
5357
5358 #ifdef INET
5359 void
5360 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5361     struct pf_state *s, struct pf_pdesc *pd)
5362 {
5363         struct mbuf             *m0, *m1;
5364         struct route             iproute;
5365         struct route            *ro = NULL;
5366         struct sockaddr_in      *dst;
5367         struct ip               *ip;
5368         struct ifnet            *ifp = NULL;
5369         struct pf_addr           naddr;
5370         struct pf_src_node      *sn = NULL;
5371         int                      error = 0;
5372         int sw_csum;
5373 #ifdef IPSEC
5374         struct m_tag            *mtag;
5375 #endif /* IPSEC */
5376
5377         ASSERT_LWKT_TOKEN_HELD(&pf_token);
5378
5379         if (m == NULL || *m == NULL || r == NULL ||
5380             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5381                 panic("pf_route: invalid parameters");
5382
5383         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5384                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5385                 (*m)->m_pkthdr.pf.routed = 1;
5386         } else {
5387                 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5388                         m0 = *m;
5389                         *m = NULL;
5390                         goto bad;
5391                 }
5392         }
5393
5394         if (r->rt == PF_DUPTO) {
5395                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) {
5396                         return;
5397                 }
5398         } else {
5399                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5400                         return;
5401                 }
5402                 m0 = *m;
5403         }
5404
5405         if (m0->m_len < sizeof(struct ip)) {
5406                 DPFPRINTF(PF_DEBUG_URGENT,
5407                     ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5408                 goto bad;
5409         }
5410
5411         ip = mtod(m0, struct ip *);
5412
5413         ro = &iproute;
5414         bzero((caddr_t)ro, sizeof(*ro));
5415         dst = satosin(&ro->ro_dst);
5416         dst->sin_family = AF_INET;
5417         dst->sin_len = sizeof(*dst);
5418         dst->sin_addr = ip->ip_dst;
5419
5420         if (r->rt == PF_FASTROUTE) {
5421                 rtalloc(ro);
5422                 if (ro->ro_rt == 0) {
5423                         ipstat.ips_noroute++;
5424                         goto bad;
5425                 }
5426
5427                 ifp = ro->ro_rt->rt_ifp;
5428                 ro->ro_rt->rt_use++;
5429
5430                 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
5431                         dst = satosin(ro->ro_rt->rt_gateway);
5432         } else {
5433                 if (TAILQ_EMPTY(&r->rpool.list)) {
5434                         DPFPRINTF(PF_DEBUG_URGENT,
5435                             ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
5436                         goto bad;
5437                 }
5438                 if (s == NULL) {
5439                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5440                             &naddr, NULL, &sn);
5441                         if (!PF_AZERO(&naddr, AF_INET))
5442                                 dst->sin_addr.s_addr = naddr.v4.s_addr;
5443                         ifp = r->rpool.cur->kif ?
5444                             r->rpool.cur->kif->pfik_ifp : NULL;
5445                 } else {
5446                         if (!PF_AZERO(&s->rt_addr, AF_INET))
5447                                 dst->sin_addr.s_addr =
5448                                     s->rt_addr.v4.s_addr;
5449                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5450                 }
5451         }
5452         if (ifp == NULL)
5453                 goto bad;
5454
5455         if (oifp != ifp) {
5456                 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5457                         goto bad;
5458                 } else if (m0 == NULL) {
5459                         goto done;
5460                 }
5461                 if (m0->m_len < sizeof(struct ip)) {
5462                         DPFPRINTF(PF_DEBUG_URGENT,
5463                             ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5464                         goto bad;
5465                 }
5466                 ip = mtod(m0, struct ip *);
5467         }
5468
5469         /* Copied from FreeBSD 5.1-CURRENT ip_output. */
5470         m0->m_pkthdr.csum_flags |= CSUM_IP;
5471         sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
5472         if (sw_csum & CSUM_DELAY_DATA) {
5473                 in_delayed_cksum(m0);
5474                 sw_csum &= ~CSUM_DELAY_DATA;
5475         }
5476         m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
5477
5478         if (ip->ip_len <= ifp->if_mtu ||
5479             (ifp->if_hwassist & CSUM_FRAGMENT &&
5480                 (ip->ip_off & IP_DF) == 0)) {
5481                 ip->ip_len = htons(ip->ip_len);
5482                 ip->ip_off = htons(ip->ip_off);
5483                 ip->ip_sum = 0;
5484                 if (sw_csum & CSUM_DELAY_IP) {
5485                         /* From KAME */
5486                         if (ip->ip_v == IPVERSION &&
5487                             (ip->ip_hl << 2) == sizeof(*ip)) {
5488                                 ip->ip_sum = in_cksum_hdr(ip);
5489                         } else {
5490                                 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5491                         }
5492                 }
5493                 lwkt_reltoken(&pf_token);
5494                 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt);
5495                 lwkt_gettoken(&pf_token);
5496                 goto done;
5497         }
5498
5499         /*
5500          * Too large for interface; fragment if possible.
5501          * Must be able to put at least 8 bytes per fragment.
5502          */
5503         if (ip->ip_off & IP_DF) {
5504                 ipstat.ips_cantfrag++;
5505                 if (r->rt != PF_DUPTO) {
5506                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5507                             ifp->if_mtu);
5508                         goto done;
5509                 } else
5510                         goto bad;
5511         }
5512
5513         m1 = m0;
5514         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5515         if (error) {
5516                 goto bad;
5517         }
5518
5519         for (m0 = m1; m0; m0 = m1) {
5520                 m1 = m0->m_nextpkt;
5521                 m0->m_nextpkt = 0;
5522                 if (error == 0) {
5523                         lwkt_reltoken(&pf_token);
5524                         error = (*ifp->if_output)(ifp, m0, sintosa(dst),
5525                                                   NULL);
5526                         lwkt_gettoken(&pf_token);
5527                 } else
5528                         m_freem(m0);
5529         }
5530
5531         if (error == 0)
5532                 ipstat.ips_fragmented++;
5533
5534 done:
5535         if (r->rt != PF_DUPTO)
5536                 *m = NULL;
5537         if (ro == &iproute && ro->ro_rt)
5538                 RTFREE(ro->ro_rt);
5539         return;
5540
5541 bad:
5542         m_freem(m0);
5543         goto done;
5544 }
5545 #endif /* INET */
5546
5547 #ifdef INET6
5548 void
5549 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5550     struct pf_state *s, struct pf_pdesc *pd)
5551 {
5552         struct mbuf             *m0;
5553         struct route_in6         ip6route;
5554         struct route_in6        *ro;
5555         struct sockaddr_in6     *dst;
5556         struct ip6_hdr          *ip6;
5557         struct ifnet            *ifp = NULL;
5558         struct pf_addr           naddr;
5559         struct pf_src_node      *sn = NULL;
5560         int                      error = 0;
5561
5562         if (m == NULL || *m == NULL || r == NULL ||
5563             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5564                 panic("pf_route6: invalid parameters");
5565
5566         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5567                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5568                 (*m)->m_pkthdr.pf.routed = 1;
5569         } else {
5570                 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5571                         m0 = *m;
5572                         *m = NULL;
5573                         goto bad;
5574                 }
5575         }
5576
5577         if (r->rt == PF_DUPTO) {
5578                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5579                         return;
5580         } else {
5581                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5582                         return;
5583                 m0 = *m;
5584         }
5585
5586         if (m0->m_len < sizeof(struct ip6_hdr)) {
5587                 DPFPRINTF(PF_DEBUG_URGENT,
5588                     ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5589                 goto bad;
5590         }
5591         ip6 = mtod(m0, struct ip6_hdr *);
5592
5593         ro = &ip6route;
5594         bzero((caddr_t)ro, sizeof(*ro));
5595         dst = (struct sockaddr_in6 *)&ro->ro_dst;
5596         dst->sin6_family = AF_INET6;
5597         dst->sin6_len = sizeof(*dst);
5598         dst->sin6_addr = ip6->ip6_dst;
5599
5600         /*
5601          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
5602          * so make sure pf.flags is clear.
5603          *
5604          * Cheat. XXX why only in the v6 case???
5605          */
5606         if (r->rt == PF_FASTROUTE) {
5607                 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
5608                 m0->m_pkthdr.pf.flags = 0;
5609                 /* XXX Re-Check when Upgrading to > 4.4 */
5610                 m0->m_pkthdr.pf.statekey = NULL;
5611                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5612                 return;
5613         }
5614
5615         if (TAILQ_EMPTY(&r->rpool.list)) {
5616                 DPFPRINTF(PF_DEBUG_URGENT,
5617                     ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
5618                 goto bad;
5619         }
5620         if (s == NULL) {
5621                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5622                     &naddr, NULL, &sn);
5623                 if (!PF_AZERO(&naddr, AF_INET6))
5624                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5625                             &naddr, AF_INET6);
5626                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5627         } else {
5628                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5629                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5630                             &s->rt_addr, AF_INET6);
5631                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5632         }
5633         if (ifp == NULL)
5634                 goto bad;
5635
5636         if (oifp != ifp) {
5637                 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5638                         goto bad;
5639                 } else if (m0 == NULL) {
5640                         goto done;
5641                 }
5642                 if (m0->m_len < sizeof(struct ip6_hdr)) {
5643                         DPFPRINTF(PF_DEBUG_URGENT,
5644                             ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5645                         goto bad;
5646                 }
5647                 ip6 = mtod(m0, struct ip6_hdr *);
5648         }
5649
5650         /*
5651          * If the packet is too large for the outgoing interface,
5652          * send back an icmp6 error.
5653          */
5654         if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5655                 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5656         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5657                 error = nd6_output(ifp, ifp, m0, dst, NULL);
5658         } else {
5659                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5660                 if (r->rt != PF_DUPTO)
5661                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5662                 else
5663                         goto bad;
5664         }
5665
5666 done:
5667         if (r->rt != PF_DUPTO)
5668                 *m = NULL;
5669         return;
5670
5671 bad:
5672         m_freem(m0);
5673         goto done;
5674 }
5675 #endif /* INET6 */
5676
5677
5678 /*
5679  * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5680  *   off is the offset where the protocol header starts
5681  *   len is the total length of protocol header plus payload
5682  * returns 0 when the checksum is valid, otherwise returns 1.
5683  */
5684 /*
5685  * XXX
5686  * FreeBSD supports cksum offload for the following drivers.
5687  * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5688  * If we can make full use of it we would outperform ipfw/ipfilter in
5689  * very heavy traffic.
5690  * I have not tested 'cause I don't have NICs that supports cksum offload.
5691  * (There might be problems. Typical phenomena would be
5692  *   1. No route message for UDP packet.
5693  *   2. No connection acceptance from external hosts regardless of rule set.)
5694  */
5695 int
5696 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5697     sa_family_t af)
5698 {
5699         u_int16_t sum = 0;
5700         int hw_assist = 0;
5701         struct ip *ip;
5702
5703         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5704                 return (1);
5705         if (m->m_pkthdr.len < off + len)
5706                 return (1);
5707
5708         switch (p) {
5709         case IPPROTO_TCP:
5710         case IPPROTO_UDP:
5711                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5712                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5713                                 sum = m->m_pkthdr.csum_data;
5714                         } else {
5715                                 ip = mtod(m, struct ip *);
5716                                 sum = in_pseudo(ip->ip_src.s_addr,
5717                                         ip->ip_dst.s_addr, htonl((u_short)len +
5718                                         m->m_pkthdr.csum_data + p));
5719                         }
5720                         sum ^= 0xffff;
5721                         ++hw_assist;
5722                 }
5723                 break;
5724         case IPPROTO_ICMP:
5725 #ifdef INET6
5726         case IPPROTO_ICMPV6:
5727 #endif /* INET6 */
5728                 break;
5729         default:
5730                 return (1);
5731         }
5732
5733         if (!hw_assist) {
5734                 switch (af) {
5735                 case AF_INET:
5736                         if (p == IPPROTO_ICMP) {
5737                                 if (m->m_len < off)
5738                                         return (1);
5739                                 m->m_data += off;
5740                                 m->m_len -= off;
5741                                 sum = in_cksum(m, len);
5742                                 m->m_data -= off;
5743                                 m->m_len += off;
5744                         } else {
5745                                 if (m->m_len < sizeof(struct ip))
5746                                         return (1);
5747                                 sum = in_cksum_range(m, p, off, len);
5748                                 if (sum == 0) {
5749                                         m->m_pkthdr.csum_flags |=
5750                                             (CSUM_DATA_VALID |
5751                                              CSUM_PSEUDO_HDR);
5752                                         m->m_pkthdr.csum_data = 0xffff;
5753                                 }
5754                         }
5755                         break;
5756 #ifdef INET6
5757                 case AF_INET6:
5758                         if (m->m_len < sizeof(struct ip6_hdr))
5759                                 return (1);
5760                         sum = in6_cksum(m, p, off, len);
5761                         /*
5762                          * XXX
5763                          * IPv6 H/W cksum off-load not supported yet!
5764                          *
5765                          * if (sum == 0) {
5766                          *      m->m_pkthdr.csum_flags |=
5767                          *          (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5768                          *      m->m_pkthdr.csum_data = 0xffff;
5769                          *}
5770                          */
5771                         break;
5772 #endif /* INET6 */
5773                 default:
5774                         return (1);
5775                 }
5776         }
5777         if (sum) {
5778                 switch (p) {
5779                 case IPPROTO_TCP:
5780                         tcpstat.tcps_rcvbadsum++;
5781                         break;
5782                 case IPPROTO_UDP:
5783                         udpstat.udps_badsum++;
5784                         break;
5785                 case IPPROTO_ICMP:
5786                         icmpstat.icps_checksum++;
5787                         break;
5788 #ifdef INET6
5789                 case IPPROTO_ICMPV6:
5790                         icmp6stat.icp6s_checksum++;
5791                         break;
5792 #endif /* INET6 */
5793                 }
5794                 return (1);
5795         }
5796         return (0);
5797 }
5798
5799 struct pf_divert *
5800 pf_find_divert(struct mbuf *m)
5801 {
5802         struct m_tag    *mtag;
5803
5804         if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL)
5805                 return (NULL);
5806
5807         return ((struct pf_divert *)(mtag + 1));
5808 }
5809
5810 struct pf_divert *
5811 pf_get_divert(struct mbuf *m)
5812 {
5813         struct m_tag    *mtag;
5814
5815         if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) {
5816                 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert),
5817                     M_NOWAIT);
5818                 if (mtag == NULL)
5819                         return (NULL);
5820                 bzero(mtag + 1, sizeof(struct pf_divert));
5821                 m_tag_prepend(m, mtag);
5822         }
5823
5824         return ((struct pf_divert *)(mtag + 1));
5825 }
5826
5827 #ifdef INET
5828 int
5829 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
5830     struct ether_header *eh, struct inpcb *inp)
5831 {
5832         struct pfi_kif          *kif;
5833         u_short                  action, reason = 0, log = 0;
5834         struct mbuf             *m = *m0;
5835         struct ip               *h = NULL;
5836         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5837         struct pf_state         *s = NULL;
5838         struct pf_ruleset       *ruleset = NULL;
5839         struct pf_pdesc          pd;
5840         int                      off, dirndx, pqid = 0;
5841
5842         if (!pf_status.running)
5843                 return (PF_PASS);
5844
5845         memset(&pd, 0, sizeof(pd));
5846         if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
5847                 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
5848         else
5849                 kif = (struct pfi_kif *)ifp->if_pf_kif;
5850
5851         if (kif == NULL) {
5852                 DPFPRINTF(PF_DEBUG_URGENT,
5853                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5854                 return (PF_DROP);
5855         }
5856         if (kif->pfik_flags & PFI_IFLAG_SKIP)
5857                 return (PF_PASS);
5858
5859 #ifdef DIAGNOSTIC
5860         if ((m->m_flags & M_PKTHDR) == 0)
5861                 panic("non-M_PKTHDR is passed to pf_test");
5862 #endif /* DIAGNOSTIC */
5863
5864         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5865                 action = PF_DROP;
5866                 REASON_SET(&reason, PFRES_SHORT);
5867                 log = 1;
5868                 goto done;
5869         }
5870
5871         /*
5872          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
5873          * so make sure pf.flags is clear.
5874          */
5875         if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
5876                 return (PF_PASS);
5877         m->m_pkthdr.pf.flags = 0;
5878         /* Re-Check when updating to > 4.4 */
5879         m->m_pkthdr.pf.statekey = NULL;
5880
5881         /* We do IP header normalization and packet reassembly here */
5882         if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5883                 action = PF_DROP;
5884                 goto done;
5885         }
5886         m = *m0;        /* pf_normalize messes with m0 */
5887         h = mtod(m, struct ip *);
5888
5889         off = h->ip_hl << 2;
5890         if (off < (int)sizeof(*h)) {
5891                 action = PF_DROP;
5892                 REASON_SET(&reason, PFRES_SHORT);
5893                 log = 1;
5894                 goto done;
5895         }
5896
5897         pd.src = (struct pf_addr *)&h->ip_src;
5898         pd.dst = (struct pf_addr *)&h->ip_dst;
5899         pd.sport = pd.dport = NULL;
5900         pd.ip_sum = &h->ip_sum;
5901         pd.proto_sum = NULL;
5902         pd.proto = h->ip_p;
5903         pd.dir = dir;
5904         pd.sidx = (dir == PF_IN) ? 0 : 1;
5905         pd.didx = (dir == PF_IN) ? 1 : 0;
5906         pd.af = AF_INET;
5907         pd.tos = h->ip_tos;
5908         pd.tot_len = h->ip_len;
5909         pd.eh = eh;
5910
5911         /* handle fragments that didn't get reassembled by normalization */
5912         if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5913                 action = pf_test_fragment(&r, dir, kif, m, h,
5914                     &pd, &a, &ruleset);
5915                 goto done;
5916         }
5917
5918         switch (h->ip_p) {
5919
5920         case IPPROTO_TCP: {
5921                 struct tcphdr   th;
5922
5923                 pd.hdr.tcp = &th;
5924                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5925                     &action, &reason, AF_INET)) {
5926                         log = action != PF_PASS;
5927                         goto done;
5928                 }
5929                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5930                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5931                         pqid = 1;
5932                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5933                 if (action == PF_DROP)
5934                         goto done;
5935                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5936                     &reason);
5937                 if (action == PF_PASS) {
5938                         pfsync_update_state(s);
5939                         r = s->rule.ptr;
5940                         a = s->anchor.ptr;
5941                         log = s->log;
5942                 } else if (s == NULL)
5943                         action = pf_test_rule(&r, &s, dir, kif,
5944                             m, off, h, &pd, &a, &ruleset, NULL, inp);
5945                 break;
5946         }
5947
5948         case IPPROTO_UDP: {
5949                 struct udphdr   uh;
5950
5951                 pd.hdr.udp = &uh;
5952                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5953                     &action, &reason, AF_INET)) {
5954                         log = action != PF_PASS;
5955                         goto done;
5956                 }
5957                 if (uh.uh_dport == 0 ||
5958                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5959                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5960                         action = PF_DROP;
5961                         REASON_SET(&reason, PFRES_SHORT);
5962                         goto done;
5963                 }
5964                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5965                 if (action == PF_PASS) {
5966                         pfsync_update_state(s);
5967                         r = s->rule.ptr;
5968                         a = s->anchor.ptr;
5969                         log = s->log;
5970                 } else if (s == NULL)
5971                         action = pf_test_rule(&r, &s, dir, kif,
5972                             m, off, h, &pd, &a, &ruleset, NULL, inp);
5973                 break;
5974         }
5975
5976         case IPPROTO_ICMP: {
5977                 struct icmp     ih;
5978
5979                 pd.hdr.icmp = &ih;
5980                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5981                     &action, &reason, AF_INET)) {
5982                         log = action != PF_PASS;
5983                         goto done;
5984                 }
5985                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
5986                     &reason);
5987                 if (action == PF_PASS) {
5988                         pfsync_update_state(s);
5989                         r = s->rule.ptr;
5990                         a = s->anchor.ptr;
5991                         log = s->log;
5992                 } else if (s == NULL)
5993                         action = pf_test_rule(&r, &s, dir, kif,
5994                             m, off, h, &pd, &a, &ruleset, NULL, inp);
5995                 break;
5996         }
5997
5998         default:
5999                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6000                 if (action == PF_PASS) {
6001                         pfsync_update_state(s);
6002                         r = s->rule.ptr;
6003                         a = s->anchor.ptr;
6004                         log = s->log;
6005                 } else if (s == NULL)
6006                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6007                             &pd, &a, &ruleset, NULL, inp);
6008                 break;
6009         }
6010
6011 done:
6012         if (action == PF_PASS && h->ip_hl > 5 &&
6013             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6014                 action = PF_DROP;
6015                 REASON_SET(&reason, PFRES_IPOPTIONS);
6016                 log = 1;
6017                 DPFPRINTF(PF_DEBUG_MISC,
6018                     ("pf: dropping packet with ip options\n"));
6019         }
6020
6021         if ((s && s->tag) || r->rtableid)
6022                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6023
6024 #if 0
6025         if (dir == PF_IN && s && s->key[PF_SK_STACK])
6026                 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
6027 #endif
6028
6029 #ifdef ALTQ
6030         if (action == PF_PASS && r->qid) {
6031                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
6032                 if (pqid || (pd.tos & IPTOS_LOWDELAY))
6033                         m->m_pkthdr.pf.qid = r->pqid;
6034                 else
6035                         m->m_pkthdr.pf.qid = r->qid;
6036                 m->m_pkthdr.pf.ecn_af = AF_INET;
6037                 m->m_pkthdr.pf.hdr = h;
6038                 /* add connection hash for fairq */
6039                 if (s) {
6040                         /* for fairq */
6041                         m->m_pkthdr.pf.state_hash = s->hash;
6042                         m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
6043                 }
6044         }
6045 #endif /* ALTQ */
6046
6047         /*
6048          * connections redirected to loopback should not match sockets
6049          * bound specifically to loopback due to security implications,
6050          * see tcp_input() and in_pcblookup_listen().
6051          */
6052         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6053             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6054             (s->nat_rule.ptr->action == PF_RDR ||
6055             s->nat_rule.ptr->action == PF_BINAT) &&
6056             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
6057                 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
6058
6059         if (dir == PF_IN && action == PF_PASS && r->divert.port) {
6060                 struct pf_divert *divert;
6061
6062                 if ((divert = pf_get_divert(m))) {
6063                         m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
6064                         divert->port = r->divert.port;
6065                         divert->addr.ipv4 = r->divert.addr.v4;
6066                 }
6067         }
6068
6069         if (log) {
6070                 struct pf_rule *lr;
6071
6072                 if (s != NULL && s->nat_rule.ptr != NULL &&
6073                     s->nat_rule.ptr->log & PF_LOG_ALL)
6074                         lr = s->nat_rule.ptr;
6075                 else
6076                         lr = r;
6077                 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset,
6078                     &pd);
6079         }
6080
6081         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6082         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6083
6084         if (action == PF_PASS || r->action == PF_DROP) {
6085                 dirndx = (dir == PF_OUT);
6086                 r->packets[dirndx]++;
6087                 r->bytes[dirndx] += pd.tot_len;
6088                 if (a != NULL) {
6089                         a->packets[dirndx]++;
6090                         a->bytes[dirndx] += pd.tot_len;
6091                 }
6092                 if (s != NULL) {
6093                         if (s->nat_rule.ptr != NULL) {
6094                                 s->nat_rule.ptr->packets[dirndx]++;
6095                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6096                         }
6097                         if (s->src_node != NULL) {
6098                                 s->src_node->packets[dirndx]++;
6099                                 s->src_node->bytes[dirndx] += pd.tot_len;
6100                         }
6101                         if (s->nat_src_node != NULL) {
6102                                 s->nat_src_node->packets[dirndx]++;
6103                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6104                         }
6105                         dirndx = (dir == s->direction) ? 0 : 1;
6106                         s->packets[dirndx]++;
6107                         s->bytes[dirndx] += pd.tot_len;
6108                 }
6109                 tr = r;
6110                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6111                 if (nr != NULL && r == &pf_default_rule)
6112                         tr = nr;
6113                 if (tr->src.addr.type == PF_ADDR_TABLE)
6114                         pfr_update_stats(tr->src.addr.p.tbl,
6115                             (s == NULL) ? pd.src :
6116                             &s->key[(s->direction == PF_IN)]->
6117                                 addr[(s->direction == PF_OUT)],
6118                             pd.af, pd.tot_len, dir == PF_OUT,
6119                             r->action == PF_PASS, tr->src.neg);
6120                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6121                         pfr_update_stats(tr->dst.addr.p.tbl,
6122                             (s == NULL) ? pd.dst :
6123                             &s->key[(s->direction == PF_IN)]->
6124                                 addr[(s->direction == PF_IN)],
6125                             pd.af, pd.tot_len, dir == PF_OUT,
6126                             r->action == PF_PASS, tr->dst.neg);
6127         }
6128
6129
6130         if (action == PF_SYNPROXY_DROP) {
6131                 m_freem(*m0);
6132                 *m0 = NULL;
6133                 action = PF_PASS;
6134         } else if (r->rt)
6135                 /* pf_route can free the mbuf causing *m0 to become NULL */
6136                 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
6137
6138         return (action);
6139 }
6140 #endif /* INET */
6141
6142 #ifdef INET6
6143 int
6144 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
6145     struct ether_header *eh, struct inpcb *inp)
6146 {
6147         struct pfi_kif          *kif;
6148         u_short                  action, reason = 0, log = 0;
6149         struct mbuf             *m = *m0, *n = NULL;
6150         struct ip6_hdr          *h = NULL;
6151         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
6152         struct pf_state         *s = NULL;
6153         struct pf_ruleset       *ruleset = NULL;
6154         struct pf_pdesc          pd;
6155         int                      off, terminal = 0, dirndx, rh_cnt = 0;
6156
6157         if (!pf_status.running)
6158                 return (PF_PASS);
6159
6160         memset(&pd, 0, sizeof(pd));
6161         if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
6162                 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
6163         else
6164                 kif = (struct pfi_kif *)ifp->if_pf_kif;
6165
6166         if (kif == NULL) {
6167                 DPFPRINTF(PF_DEBUG_URGENT,
6168                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6169                 return (PF_DROP);
6170         }
6171         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6172                 return (PF_PASS);
6173
6174 #ifdef DIAGNOSTIC
6175         if ((m->m_flags & M_PKTHDR) == 0)
6176                 panic("non-M_PKTHDR is passed to pf_test6");
6177 #endif /* DIAGNOSTIC */
6178
6179         if (m->m_pkthdr.len < (int)sizeof(*h)) {
6180                 action = PF_DROP;
6181                 REASON_SET(&reason, PFRES_SHORT);
6182                 log = 1;
6183                 goto done;
6184         }
6185
6186         /*
6187          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
6188          * so make sure pf.flags is clear.
6189          */
6190         if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
6191                 return (PF_PASS);
6192         m->m_pkthdr.pf.flags = 0;
6193         /* Re-Check when updating to > 4.4 */
6194         m->m_pkthdr.pf.statekey = NULL;
6195
6196         /* We do IP header normalization and packet reassembly here */
6197         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6198                 action = PF_DROP;
6199                 goto done;
6200         }
6201         m = *m0;        /* pf_normalize messes with m0 */
6202         h = mtod(m, struct ip6_hdr *);
6203
6204 #if 1
6205         /*
6206          * we do not support jumbogram yet.  if we keep going, zero ip6_plen
6207          * will do something bad, so drop the packet for now.
6208          */
6209         if (htons(h->ip6_plen) == 0) {
6210                 action = PF_DROP;
6211                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
6212                 goto done;
6213         }
6214 #endif
6215
6216         pd.src = (struct pf_addr *)&h->ip6_src;
6217         pd.dst = (struct pf_addr *)&h->ip6_dst;
6218         pd.sport = pd.dport = NULL;
6219         pd.ip_sum = NULL;
6220         pd.proto_sum = NULL;
6221         pd.dir = dir;
6222         pd.sidx = (dir == PF_IN) ? 0 : 1;
6223         pd.didx = (dir == PF_IN) ? 1 : 0;
6224         pd.af = AF_INET6;
6225         pd.tos = 0;
6226         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6227         pd.eh = eh;
6228
6229         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6230         pd.proto = h->ip6_nxt;
6231         do {
6232                 switch (pd.proto) {
6233                 case IPPROTO_FRAGMENT:
6234                         action = pf_test_fragment(&r, dir, kif, m, h,
6235                             &pd, &a, &ruleset);
6236                         if (action == PF_DROP)
6237                                 REASON_SET(&reason, PFRES_FRAG);
6238                         goto done;
6239                 case IPPROTO_ROUTING: {
6240                         struct ip6_rthdr rthdr;
6241
6242                         if (rh_cnt++) {
6243                                 DPFPRINTF(PF_DEBUG_MISC,
6244                                     ("pf: IPv6 more than one rthdr\n"));
6245                                 action = PF_DROP;
6246                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6247                                 log = 1;
6248                                 goto done;
6249                         }
6250                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6251                             &reason, pd.af)) {
6252                                 DPFPRINTF(PF_DEBUG_MISC,
6253                                     ("pf: IPv6 short rthdr\n"));
6254                                 action = PF_DROP;
6255                                 REASON_SET(&reason, PFRES_SHORT);
6256                                 log = 1;
6257                                 goto done;
6258                         }
6259                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6260                                 DPFPRINTF(PF_DEBUG_MISC,
6261                                     ("pf: IPv6 rthdr0\n"));
6262                                 action = PF_DROP;
6263                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6264                                 log = 1;
6265                                 goto done;
6266                         }
6267                         /* FALLTHROUGH */
6268                 }
6269                 case IPPROTO_AH:
6270                 case IPPROTO_HOPOPTS:
6271                 case IPPROTO_DSTOPTS: {
6272                         /* get next header and header length */
6273                         struct ip6_ext  opt6;
6274
6275                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6276                             NULL, &reason, pd.af)) {
6277                                 DPFPRINTF(PF_DEBUG_MISC,
6278                                     ("pf: IPv6 short opt\n"));
6279                                 action = PF_DROP;
6280                                 log = 1;
6281                                 goto done;
6282                         }
6283                         if (pd.proto == IPPROTO_AH)
6284                                 off += (opt6.ip6e_len + 2) * 4;
6285                         else
6286                                 off += (opt6.ip6e_len + 1) * 8;
6287                         pd.proto = opt6.ip6e_nxt;
6288                         /* goto the next header */
6289                         break;
6290                 }
6291                 default:
6292                         terminal++;
6293                         break;
6294                 }
6295         } while (!terminal);
6296
6297         /* if there's no routing header, use unmodified mbuf for checksumming */
6298         if (!n)
6299                 n = m;
6300
6301         switch (pd.proto) {
6302
6303         case IPPROTO_TCP: {
6304                 struct tcphdr   th;
6305
6306                 pd.hdr.tcp = &th;
6307                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6308                     &action, &reason, AF_INET6)) {
6309                         log = action != PF_PASS;
6310                         goto done;
6311                 }
6312                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6313                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6314                 if (action == PF_DROP)
6315                         goto done;
6316                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6317                     &reason);
6318                 if (action == PF_PASS) {
6319                         pfsync_update_state(s);
6320                         r = s->rule.ptr;
6321                         a = s->anchor.ptr;
6322                         log = s->log;
6323                 } else if (s == NULL)
6324                         action = pf_test_rule(&r, &s, dir, kif,
6325                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6326                 break;
6327         }
6328
6329         case IPPROTO_UDP: {
6330                 struct udphdr   uh;
6331
6332                 pd.hdr.udp = &uh;
6333                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6334                     &action, &reason, AF_INET6)) {
6335                         log = action != PF_PASS;
6336                         goto done;
6337                 }
6338                 if (uh.uh_dport == 0 ||
6339                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6340                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6341                         action = PF_DROP;
6342                         REASON_SET(&reason, PFRES_SHORT);
6343                         goto done;
6344                 }
6345                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6346                 if (action == PF_PASS) {
6347                         pfsync_update_state(s);
6348                         r = s->rule.ptr;
6349                         a = s->anchor.ptr;
6350                         log = s->log;
6351                 } else if (s == NULL)
6352                         action = pf_test_rule(&r, &s, dir, kif,
6353                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6354                 break;
6355         }
6356
6357         case IPPROTO_ICMPV6: {
6358                 struct icmp6_hdr        ih;
6359
6360                 pd.hdr.icmp6 = &ih;
6361                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6362                     &action, &reason, AF_INET6)) {
6363                         log = action != PF_PASS;
6364                         goto done;
6365                 }
6366                 action = pf_test_state_icmp(&s, dir, kif,
6367                     m, off, h, &pd, &reason);
6368                 if (action == PF_PASS) {
6369                         pfsync_update_state(s);
6370                         r = s->rule.ptr;
6371                         a = s->anchor.ptr;
6372                         log = s->log;
6373                 } else if (s == NULL)
6374                         action = pf_test_rule(&r, &s, dir, kif,
6375                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6376                 break;
6377         }
6378
6379         default:
6380                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6381                 if (action == PF_PASS) {
6382                         pfsync_update_state(s);
6383                         r = s->rule.ptr;
6384                         a = s->anchor.ptr;
6385                         log = s->log;
6386                 } else if (s == NULL)
6387                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6388                             &pd, &a, &ruleset, NULL, inp);
6389                 break;
6390         }
6391
6392 done:
6393         if (n != m) {
6394                 m_freem(n);
6395                 n = NULL;
6396         }
6397
6398         /* handle dangerous IPv6 extension headers. */
6399         if (action == PF_PASS && rh_cnt &&
6400             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6401                 action = PF_DROP;
6402                 REASON_SET(&reason, PFRES_IPOPTIONS);
6403                 log = 1;
6404                 DPFPRINTF(PF_DEBUG_MISC,
6405                     ("pf: dropping packet with dangerous v6 headers\n"));
6406         }
6407
6408         if ((s && s->tag) || r->rtableid)
6409                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6410
6411 #if 0
6412         if (dir == PF_IN && s && s->key[PF_SK_STACK])
6413                 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
6414 #endif
6415
6416 #ifdef ALTQ
6417         if (action == PF_PASS && r->qid) {
6418                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
6419                 if (pd.tos & IPTOS_LOWDELAY)
6420                         m->m_pkthdr.pf.qid = r->pqid;
6421                 else
6422                         m->m_pkthdr.pf.qid = r->qid;
6423                 m->m_pkthdr.pf.ecn_af = AF_INET6;
6424                 m->m_pkthdr.pf.hdr = h;
6425                 if (s) {
6426                         /* for fairq */
6427                         m->m_pkthdr.pf.state_hash = s->hash;
6428                         m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
6429                 }
6430         }
6431 #endif /* ALTQ */
6432
6433         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6434             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6435             (s->nat_rule.ptr->action == PF_RDR ||
6436             s->nat_rule.ptr->action == PF_BINAT) &&
6437             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6438                 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
6439
6440         if (dir == PF_IN && action == PF_PASS && r->divert.port) {
6441                 struct pf_divert *divert;
6442
6443                 if ((divert = pf_get_divert(m))) {
6444                         m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
6445                         divert->port = r->divert.port;
6446                         divert->addr.ipv6 = r->divert.addr.v6;
6447                 }
6448         }
6449
6450         if (log) {
6451                 struct pf_rule *lr;
6452
6453                 if (s != NULL && s->nat_rule.ptr != NULL &&
6454                     s->nat_rule.ptr->log & PF_LOG_ALL)
6455                         lr = s->nat_rule.ptr;
6456                 else
6457                         lr = r;
6458                 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset,
6459                     &pd);
6460         }
6461
6462         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6463         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6464
6465         if (action == PF_PASS || r->action == PF_DROP) {
6466                 dirndx = (dir == PF_OUT);
6467                 r->packets[dirndx]++;
6468                 r->bytes[dirndx] += pd.tot_len;
6469                 if (a != NULL) {
6470                         a->packets[dirndx]++;
6471                         a->bytes[dirndx] += pd.tot_len;
6472                 }
6473                 if (s != NULL) {
6474                         if (s->nat_rule.ptr != NULL) {
6475                                 s->nat_rule.ptr->packets[dirndx]++;
6476                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6477                         }
6478                         if (s->src_node != NULL) {
6479                                 s->src_node->packets[dirndx]++;
6480                                 s->src_node->bytes[dirndx] += pd.tot_len;
6481                         }
6482                         if (s->nat_src_node != NULL) {
6483                                 s->nat_src_node->packets[dirndx]++;
6484                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6485                         }
6486                         dirndx = (dir == s->direction) ? 0 : 1;
6487                         s->packets[dirndx]++;
6488                         s->bytes[dirndx] += pd.tot_len;
6489                 }
6490                 tr = r;
6491                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6492                 if (nr != NULL && r == &pf_default_rule)
6493                         tr = nr;
6494                 if (tr->src.addr.type == PF_ADDR_TABLE)
6495                         pfr_update_stats(tr->src.addr.p.tbl,
6496                             (s == NULL) ? pd.src :
6497                             &s->key[(s->direction == PF_IN)]->addr[0],
6498                             pd.af, pd.tot_len, dir == PF_OUT,
6499                             r->action == PF_PASS, tr->src.neg);
6500                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6501                         pfr_update_stats(tr->dst.addr.p.tbl,
6502                             (s == NULL) ? pd.dst :
6503                             &s->key[(s->direction == PF_IN)]->addr[1],
6504                             pd.af, pd.tot_len, dir == PF_OUT,
6505                             r->action == PF_PASS, tr->dst.neg);
6506         }
6507
6508
6509         if (action == PF_SYNPROXY_DROP) {
6510                 m_freem(*m0);
6511                 *m0 = NULL;
6512                 action = PF_PASS;
6513         } else if (r->rt)
6514                 /* pf_route6 can free the mbuf causing *m0 to become NULL */
6515                 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
6516
6517         return (action);
6518 }
6519 #endif /* INET6 */
6520
6521 int
6522 pf_check_congestion(struct ifqueue *ifq)
6523 {
6524                 return (0);
6525 }