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 /* mask radix tree */
 116 struct radix_node_head  *pf_maskhead;
 117
 118 /* state tables */
 119 struct pf_state_tree     pf_statetbl;
 120
 121 struct pf_altqqueue      pf_altqs[2];
 122 struct pf_palist         pf_pabuf;
 123 struct pf_altqqueue     *pf_altqs_active;
 124 struct pf_altqqueue     *pf_altqs_inactive;
 125 struct pf_status         pf_status;
 126
 127 u_int32_t                ticket_altqs_active;
 128 u_int32_t                ticket_altqs_inactive;
 129 int                      altqs_inactive_open;
 130 u_int32_t                ticket_pabuf;
 131
 132 MD5_CTX                  pf_tcp_secret_ctx;
 133 u_char                   pf_tcp_secret[16];
 134 int                      pf_tcp_secret_init;
 135 int                      pf_tcp_iss_off;
 136
 137 struct pf_anchor_stackframe {
 138         struct pf_ruleset                       *rs;
 139         struct pf_rule                          *r;
 140         struct pf_anchor_node                   *parent;
 141         struct pf_anchor                        *child;
 142 } pf_anchor_stack[64];
 143
 144 vm_zone_t                pf_src_tree_pl, pf_rule_pl, pf_pooladdr_pl;
 145 vm_zone_t                pf_state_pl, pf_state_key_pl, pf_state_item_pl;
 146 vm_zone_t                pf_altq_pl;
 147
 148 void                     pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
 149
 150 void                     pf_init_threshold(struct pf_threshold *, u_int32_t,
 151                             u_int32_t);
 152 void                     pf_add_threshold(struct pf_threshold *);
 153 int                      pf_check_threshold(struct pf_threshold *);
 154
 155 void                     pf_change_ap(struct pf_addr *, u_int16_t *,
 156                             u_int16_t *, u_int16_t *, struct pf_addr *,
 157                             u_int16_t, u_int8_t, sa_family_t);
 158 int                      pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
 159                             struct tcphdr *, struct pf_state_peer *);
 160 #ifdef INET6
 161 void                     pf_change_a6(struct pf_addr *, u_int16_t *,
 162                             struct pf_addr *, u_int8_t);
 163 #endif /* INET6 */
 164 void                     pf_change_icmp(struct pf_addr *, u_int16_t *,
 165                             struct pf_addr *, struct pf_addr *, u_int16_t,
 166                             u_int16_t *, u_int16_t *, u_int16_t *,
 167                             u_int16_t *, u_int8_t, sa_family_t);
 168 void                     pf_send_tcp(const struct pf_rule *, sa_family_t,
 169                             const struct pf_addr *, const struct pf_addr *,
 170                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 171                             u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
 172                             u_int16_t, struct ether_header *, struct ifnet *);
 173 void                     pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 174                             sa_family_t, struct pf_rule *);
 175 struct pf_rule          *pf_match_translation(struct pf_pdesc *, struct mbuf *,
 176                             int, int, struct pfi_kif *,
 177                             struct pf_addr *, u_int16_t, struct pf_addr *,
 178                             u_int16_t, int);
 179 struct pf_rule          *pf_get_translation(struct pf_pdesc *, struct mbuf *,
 180                             int, int, struct pfi_kif *, struct pf_src_node **,
 181                             struct pf_state_key **, struct pf_state_key **,
 182                             struct pf_state_key **, struct pf_state_key **,
 183                             struct pf_addr *, struct pf_addr *,
 184                             u_int16_t, u_int16_t);
 185 void                     pf_detach_state(struct pf_state *);
 186 int                      pf_state_key_setup(struct pf_pdesc *, struct pf_rule *,
 187                             struct pf_state_key **, struct pf_state_key **,
 188                             struct pf_state_key **, struct pf_state_key **,
 189                             struct pf_addr *, struct pf_addr *,
 190                             u_int16_t, u_int16_t);
 191 void                     pf_state_key_detach(struct pf_state *, int);
 192 u_int32_t                pf_tcp_iss(struct pf_pdesc *);
 193 int                      pf_test_rule(struct pf_rule **, struct pf_state **,
 194                             int, struct pfi_kif *, struct mbuf *, int,
 195                             void *, struct pf_pdesc *, struct pf_rule **,
 196                             struct pf_ruleset **, struct ifqueue *, struct inpcb *);
 197 static __inline int      pf_create_state(struct pf_rule *, struct pf_rule *,
 198                             struct pf_rule *, struct pf_pdesc *,
 199                             struct pf_src_node *, struct pf_state_key *,
 200                             struct pf_state_key *, struct pf_state_key *,
 201                             struct pf_state_key *, struct mbuf *, int,
 202                             u_int16_t, u_int16_t, int *, struct pfi_kif *,
 203                             struct pf_state **, int, u_int16_t, u_int16_t,
 204                             int);
 205 int                      pf_test_fragment(struct pf_rule **, int,
 206                             struct pfi_kif *, struct mbuf *, void *,
 207                             struct pf_pdesc *, struct pf_rule **,
 208                             struct pf_ruleset **);
 209 int                      pf_tcp_track_full(struct pf_state_peer *,
 210                             struct pf_state_peer *, struct pf_state **,
 211                             struct pfi_kif *, struct mbuf *, int,
 212                             struct pf_pdesc *, u_short *, int *);
 213 int                     pf_tcp_track_sloppy(struct pf_state_peer *,
 214                             struct pf_state_peer *, struct pf_state **,
 215                             struct pf_pdesc *, u_short *);
 216 int                      pf_test_state_tcp(struct pf_state **, int,
 217                             struct pfi_kif *, struct mbuf *, int,
 218                             void *, struct pf_pdesc *, u_short *);
 219 int                      pf_test_state_udp(struct pf_state **, int,
 220                             struct pfi_kif *, struct mbuf *, int,
 221                             void *, struct pf_pdesc *);
 222 int                      pf_test_state_icmp(struct pf_state **, int,
 223                             struct pfi_kif *, struct mbuf *, int,
 224                             void *, struct pf_pdesc *, u_short *);
 225 int                      pf_test_state_other(struct pf_state **, int,
 226                             struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
 227 void                     pf_step_into_anchor(int *, struct pf_ruleset **, int,
 228                             struct pf_rule **, struct pf_rule **, int *);
 229 int                      pf_step_out_of_anchor(int *, struct pf_ruleset **,
 230                              int, struct pf_rule **, struct pf_rule **,
 231                              int *);
 232 void                     pf_hash(struct pf_addr *, struct pf_addr *,
 233                             struct pf_poolhashkey *, sa_family_t);
 234 int                      pf_map_addr(u_int8_t, struct pf_rule *,
 235                             struct pf_addr *, struct pf_addr *,
 236                             struct pf_addr *, struct pf_src_node **);
 237 int                      pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
 238                             struct pf_addr *, struct pf_addr *, u_int16_t,
 239                             struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
 240                             struct pf_src_node **);
 241 void                     pf_route(struct mbuf **, struct pf_rule *, int,
 242                             struct ifnet *, struct pf_state *,
 243                             struct pf_pdesc *);
 244 void                     pf_route6(struct mbuf **, struct pf_rule *, int,
 245                             struct ifnet *, struct pf_state *,
 246                             struct pf_pdesc *);
 247 u_int8_t                 pf_get_wscale(struct mbuf *, int, u_int16_t,
 248                             sa_family_t);
 249 u_int16_t                pf_get_mss(struct mbuf *, int, u_int16_t,
 250                             sa_family_t);
 251 u_int16_t                pf_calc_mss(struct pf_addr *, sa_family_t,
 252                                 u_int16_t);
 253 void                     pf_set_rt_ifp(struct pf_state *,
 254                             struct pf_addr *);
 255 int                      pf_check_proto_cksum(struct mbuf *, int, int,
 256                             u_int8_t, sa_family_t);
 257 struct pf_divert        *pf_get_divert(struct mbuf *);
 258 void                     pf_print_state_parts(struct pf_state *,
 259                             struct pf_state_key *, struct pf_state_key *);
 260 int                      pf_addr_wrap_neq(struct pf_addr_wrap *,
 261                             struct pf_addr_wrap *);
 262 struct pf_state         *pf_find_state(struct pfi_kif *,
 263                             struct pf_state_key_cmp *, u_int, struct mbuf *);
 264 int                      pf_src_connlimit(struct pf_state **);
 265 int                      pf_check_congestion(struct ifqueue *);
 266
 267 extern int pf_end_threads;
 268
 269 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
 270         { &pf_state_pl, PFSTATE_HIWAT },
 271         { &pf_src_tree_pl, PFSNODE_HIWAT },
 272         { &pf_frent_pl, PFFRAG_FRENT_HIWAT },
 273         { &pfr_ktable_pl, PFR_KTABLE_HIWAT },
 274         { &pfr_kentry_pl, PFR_KENTRY_HIWAT }
 275 };
 276
 277 #define STATE_LOOKUP(i, k, d, s, m)                                     \
 278         do {                                                            \
 279                 s = pf_find_state(i, k, d, m);                  \
 280                 if (s == NULL || (s)->timeout == PFTM_PURGE)            \
 281                         return (PF_DROP);                               \
 282                 if (d == PF_OUT &&                                      \
 283                     (((s)->rule.ptr->rt == PF_ROUTETO &&                \
 284                     (s)->rule.ptr->direction == PF_OUT) ||              \
 285                     ((s)->rule.ptr->rt == PF_REPLYTO &&                 \
 286                     (s)->rule.ptr->direction == PF_IN)) &&              \
 287                     (s)->rt_kif != NULL &&                              \
 288                     (s)->rt_kif != i)                                   \
 289                         return (PF_PASS);                               \
 290         } while (0)
 291
 292 #define BOUND_IFACE(r, k) \
 293         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
 294
 295 #define STATE_INC_COUNTERS(s)                           \
 296         do {                                            \
 297                 s->rule.ptr->states_cur++;              \
 298                 s->rule.ptr->states_tot++;              \
 299                 if (s->anchor.ptr != NULL) {            \
 300                         s->anchor.ptr->states_cur++;    \
 301                         s->anchor.ptr->states_tot++;    \
 302                 }                                       \
 303                 if (s->nat_rule.ptr != NULL) {          \
 304                         s->nat_rule.ptr->states_cur++;  \
 305                         s->nat_rule.ptr->states_tot++;  \
 306                 }                                       \
 307         } while (0)
 308
 309 #define STATE_DEC_COUNTERS(s)                           \
 310         do {                                            \
 311                 if (s->nat_rule.ptr != NULL)            \
 312                         s->nat_rule.ptr->states_cur--;  \
 313                 if (s->anchor.ptr != NULL)              \
 314                         s->anchor.ptr->states_cur--;    \
 315                 s->rule.ptr->states_cur--;              \
 316         } while (0)
 317
 318 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
 319 static __inline int pf_state_compare_key(struct pf_state_key *,
 320         struct pf_state_key *);
 321 static __inline int pf_state_compare_id(struct pf_state *,
 322         struct pf_state *);
 323
 324 struct pf_src_tree tree_src_tracking;
 325
 326 struct pf_state_tree_id tree_id;
 327 struct pf_state_queue state_list;
 328
 329 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
 330 RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key);
 331 RB_GENERATE(pf_state_tree_id, pf_state,
 332     entry_id, pf_state_compare_id);
 333
 334 static __inline int
 335 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
 336 {
 337         int     diff;
 338
 339         if (a->rule.ptr > b->rule.ptr)
 340                 return (1);
 341         if (a->rule.ptr < b->rule.ptr)
 342                 return (-1);
 343         if ((diff = a->af - b->af) != 0)
 344                 return (diff);
 345         switch (a->af) {
 346 #ifdef INET
 347         case AF_INET:
 348                 if (a->addr.addr32[0] > b->addr.addr32[0])
 349                         return (1);
 350                 if (a->addr.addr32[0] < b->addr.addr32[0])
 351                         return (-1);
 352                 break;
 353 #endif /* INET */
 354 #ifdef INET6
 355         case AF_INET6:
 356                 if (a->addr.addr32[3] > b->addr.addr32[3])
 357                         return (1);
 358                 if (a->addr.addr32[3] < b->addr.addr32[3])
 359                         return (-1);
 360                 if (a->addr.addr32[2] > b->addr.addr32[2])
 361                         return (1);
 362                 if (a->addr.addr32[2] < b->addr.addr32[2])
 363                         return (-1);
 364                 if (a->addr.addr32[1] > b->addr.addr32[1])
 365                         return (1);
 366                 if (a->addr.addr32[1] < b->addr.addr32[1])
 367                         return (-1);
 368                 if (a->addr.addr32[0] > b->addr.addr32[0])
 369                         return (1);
 370                 if (a->addr.addr32[0] < b->addr.addr32[0])
 371                         return (-1);
 372                 break;
 373 #endif /* INET6 */
 374         }
 375         return (0);
 376 }
 377
 378 u_int32_t
 379 pf_state_hash(struct pf_state_key *sk)
 380 {
 381         u_int32_t hv = (u_int32_t)(((intptr_t)sk >> 6) ^ ((intptr_t)sk >> 15));
 382         if (hv == 0)    /* disallow 0 */
 383                 hv = 1;
 384         return(hv);
 385 }
 386
 387 #ifdef INET6
 388 void
 389 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 390 {
 391         switch (af) {
 392 #ifdef INET
 393         case AF_INET:
 394                 dst->addr32[0] = src->addr32[0];
 395                 break;
 396 #endif /* INET */
 397         case AF_INET6:
 398                 dst->addr32[0] = src->addr32[0];
 399                 dst->addr32[1] = src->addr32[1];
 400                 dst->addr32[2] = src->addr32[2];
 401                 dst->addr32[3] = src->addr32[3];
 402                 break;
 403         }
 404 }
 405 #endif /* INET6 */
 406
 407 void
 408 pf_init_threshold(struct pf_threshold *threshold,
 409     u_int32_t limit, u_int32_t seconds)
 410 {
 411         threshold->limit = limit * PF_THRESHOLD_MULT;
 412         threshold->seconds = seconds;
 413         threshold->count = 0;
 414         threshold->last = time_second;
 415 }
 416
 417 void
 418 pf_add_threshold(struct pf_threshold *threshold)
 419 {
 420         u_int32_t t = time_second, diff = t - threshold->last;
 421
 422         if (diff >= threshold->seconds)
 423                 threshold->count = 0;
 424         else
 425                 threshold->count -= threshold->count * diff /
 426                     threshold->seconds;
 427         threshold->count += PF_THRESHOLD_MULT;
 428         threshold->last = t;
 429 }
 430
 431 int
 432 pf_check_threshold(struct pf_threshold *threshold)
 433 {
 434         return (threshold->count > threshold->limit);
 435 }
 436
 437 int
 438 pf_src_connlimit(struct pf_state **state)
 439 {
 440         int bad = 0;
 441
 442         (*state)->src_node->conn++;
 443         (*state)->src.tcp_est = 1;
 444         pf_add_threshold(&(*state)->src_node->conn_rate);
 445
 446         if ((*state)->rule.ptr->max_src_conn &&
 447             (*state)->rule.ptr->max_src_conn <
 448             (*state)->src_node->conn) {
 449                 pf_status.lcounters[LCNT_SRCCONN]++;
 450                 bad++;
 451         }
 452
 453         if ((*state)->rule.ptr->max_src_conn_rate.limit &&
 454             pf_check_threshold(&(*state)->src_node->conn_rate)) {
 455                 pf_status.lcounters[LCNT_SRCCONNRATE]++;
 456                 bad++;
 457         }
 458
 459         if (!bad)
 460                 return (0);
 461
 462         if ((*state)->rule.ptr->overload_tbl) {
 463                 struct pfr_addr p;
 464                 u_int32_t       killed = 0;
 465
 466                 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
 467                 if (pf_status.debug >= PF_DEBUG_MISC) {
 468                         kprintf("pf_src_connlimit: blocking address ");
 469                         pf_print_host(&(*state)->src_node->addr, 0,
 470                             (*state)->key[PF_SK_WIRE]->af);
 471                 }
 472
 473                 bzero(&p, sizeof(p));
 474                 p.pfra_af = (*state)->key[PF_SK_WIRE]->af;
 475                 switch ((*state)->key[PF_SK_WIRE]->af) {
 476 #ifdef INET
 477                 case AF_INET:
 478                         p.pfra_net = 32;
 479                         p.pfra_ip4addr = (*state)->src_node->addr.v4;
 480                         break;
 481 #endif /* INET */
 482 #ifdef INET6
 483                 case AF_INET6:
 484                         p.pfra_net = 128;
 485                         p.pfra_ip6addr = (*state)->src_node->addr.v6;
 486                         break;
 487 #endif /* INET6 */
 488                 }
 489
 490                 pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
 491                     &p, time_second);
 492
 493                 /* kill existing states if that's required. */
 494                 if ((*state)->rule.ptr->flush) {
 495                         struct pf_state_key *sk;
 496                         struct pf_state *st;
 497
 498                         pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
 499                         RB_FOREACH(st, pf_state_tree_id, &tree_id) {
 500                                 sk = st->key[PF_SK_WIRE];
 501                                 /*
 502                                  * Kill states from this source.  (Only those
 503                                  * from the same rule if PF_FLUSH_GLOBAL is not
 504                                  * set)
 505                                  */
 506                                 if (sk->af ==
 507                                     (*state)->key[PF_SK_WIRE]->af &&
 508                                     (((*state)->direction == PF_OUT &&
 509                                     PF_AEQ(&(*state)->src_node->addr,
 510                                         &sk->addr[0], sk->af)) ||
 511                                     ((*state)->direction == PF_IN &&
 512                                     PF_AEQ(&(*state)->src_node->addr,
 513                                         &sk->addr[1], sk->af))) &&
 514                                     ((*state)->rule.ptr->flush &
 515                                     PF_FLUSH_GLOBAL ||
 516                                     (*state)->rule.ptr == st->rule.ptr)) {
 517                                         st->timeout = PFTM_PURGE;
 518                                         st->src.state = st->dst.state =
 519                                             TCPS_CLOSED;
 520                                         killed++;
 521                                 }
 522                         }
 523                         if (pf_status.debug >= PF_DEBUG_MISC)
 524                                 kprintf(", %u states killed", killed);
 525                 }
 526                 if (pf_status.debug >= PF_DEBUG_MISC)
 527                         kprintf("\n");
 528         }
 529
 530         /* kill this state */
 531         (*state)->timeout = PFTM_PURGE;
 532         (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
 533         return (1);
 534 }
 535
 536 int
 537 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 538     struct pf_addr *src, sa_family_t af)
 539 {
 540         struct pf_src_node      k;
 541
 542         if (*sn == NULL) {
 543                 k.af = af;
 544                 PF_ACPY(&k.addr, src, af);
 545                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 546                     rule->rpool.opts & PF_POOL_STICKYADDR)
 547                         k.rule.ptr = rule;
 548                 else
 549                         k.rule.ptr = NULL;
 550                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
 551                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
 552         }
 553         if (*sn == NULL) {
 554                 if (!rule->max_src_nodes ||
 555                     rule->src_nodes < rule->max_src_nodes)
 556                         (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT | PR_ZERO);
 557                 else
 558                         pf_status.lcounters[LCNT_SRCNODES]++;
 559                 if ((*sn) == NULL)
 560                         return (-1);
 561
 562                 pf_init_threshold(&(*sn)->conn_rate,
 563                     rule->max_src_conn_rate.limit,
 564                     rule->max_src_conn_rate.seconds);
 565
 566                 (*sn)->af = af;
 567                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 568                     rule->rpool.opts & PF_POOL_STICKYADDR)
 569                         (*sn)->rule.ptr = rule;
 570                 else
 571                         (*sn)->rule.ptr = NULL;
 572                 PF_ACPY(&(*sn)->addr, src, af);
 573                 if (RB_INSERT(pf_src_tree,
 574                     &tree_src_tracking, *sn) != NULL) {
 575                         if (pf_status.debug >= PF_DEBUG_MISC) {
 576                                 kprintf("pf: src_tree insert failed: ");
 577                                 pf_print_host(&(*sn)->addr, 0, af);
 578                                 kprintf("\n");
 579                         }
 580                         pool_put(&pf_src_tree_pl, *sn);
 581                         return (-1);
 582                 }
 583                 (*sn)->creation = time_second;
 584                 (*sn)->ruletype = rule->action;
 585                 if ((*sn)->rule.ptr != NULL)
 586                         (*sn)->rule.ptr->src_nodes++;
 587                 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
 588                 pf_status.src_nodes++;
 589         } else {
 590                 if (rule->max_src_states &&
 591                     (*sn)->states >= rule->max_src_states) {
 592                         pf_status.lcounters[LCNT_SRCSTATES]++;
 593                         return (-1);
 594                 }
 595         }
 596         return (0);
 597 }
 598
 599 /* state table stuff */
 600
 601 static __inline int
 602 pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b)
 603 {
 604         int     diff;
 605
 606         if ((diff = a->proto - b->proto) != 0)
 607                 return (diff);
 608         if ((diff = a->af - b->af) != 0)
 609                 return (diff);
 610         switch (a->af) {
 611 #ifdef INET
 612         case AF_INET:
 613                 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
 614                         return (1);
 615                 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
 616                         return (-1);
 617                 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
 618                         return (1);
 619                 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
 620                         return (-1);
 621                 break;
 622 #endif /* INET */
 623 #ifdef INET6
 624         case AF_INET6:
 625                 if (a->addr[0].addr32[3] > b->addr[0].addr32[3])
 626                         return (1);
 627                 if (a->addr[0].addr32[3] < b->addr[0].addr32[3])
 628                         return (-1);
 629                 if (a->addr[1].addr32[3] > b->addr[1].addr32[3])
 630                         return (1);
 631                 if (a->addr[1].addr32[3] < b->addr[1].addr32[3])
 632                         return (-1);
 633                 if (a->addr[0].addr32[2] > b->addr[0].addr32[2])
 634                         return (1);
 635                 if (a->addr[0].addr32[2] < b->addr[0].addr32[2])
 636                         return (-1);
 637                 if (a->addr[1].addr32[2] > b->addr[1].addr32[2])
 638                         return (1);
 639                 if (a->addr[1].addr32[2] < b->addr[1].addr32[2])
 640                         return (-1);
 641                 if (a->addr[0].addr32[1] > b->addr[0].addr32[1])
 642                         return (1);
 643                 if (a->addr[0].addr32[1] < b->addr[0].addr32[1])
 644                         return (-1);
 645                 if (a->addr[1].addr32[1] > b->addr[1].addr32[1])
 646                         return (1);
 647                 if (a->addr[1].addr32[1] < b->addr[1].addr32[1])
 648                         return (-1);
 649                 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
 650                         return (1);
 651                 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
 652                         return (-1);
 653                 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
 654                         return (1);
 655                 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
 656                         return (-1);
 657                 break;
 658 #endif /* INET6 */
 659         }
 660
 661         if ((diff = a->port[0] - b->port[0]) != 0)
 662                 return (diff);
 663         if ((diff = a->port[1] - b->port[1]) != 0)
 664                 return (diff);
 665
 666         return (0);
 667 }
 668
 669 static __inline int
 670 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
 671 {
 672         if (a->id > b->id)
 673                 return (1);
 674         if (a->id < b->id)
 675                 return (-1);
 676         if (a->creatorid > b->creatorid)
 677                 return (1);
 678         if (a->creatorid < b->creatorid)
 679                 return (-1);
 680
 681         return (0);
 682 }
 683
 684 int
 685 pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx)
 686 {
 687         struct pf_state_item    *si;
 688         struct pf_state_key     *cur;
 689
 690         KKASSERT(s->key[idx] == NULL);  /* XXX handle this? */
 691
 692         if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl, sk)) != NULL) {
 693                 /* key exists. check for same kif, if none, add to key */
 694                 TAILQ_FOREACH(si, &cur->states, entry)
 695                         if (si->s->kif == s->kif &&
 696                             si->s->direction == s->direction) {
 697                                 if (pf_status.debug >= PF_DEBUG_MISC) {
 698                                         kprintf(
 699                                             "pf: %s key attach failed on %s: ",
 700                                             (idx == PF_SK_WIRE) ?
 701                                             "wire" : "stack",
 702                                             s->kif->pfik_name);
 703                                         pf_print_state_parts(s,
 704                                             (idx == PF_SK_WIRE) ? sk : NULL,
 705                                             (idx == PF_SK_STACK) ? sk : NULL);
 706                                         kprintf("\n");
 707                                 }
 708                                 pool_put(&pf_state_key_pl, sk);
 709                                 return (-1);    /* collision! */
 710                         }
 711                 pool_put(&pf_state_key_pl, sk);
 712                 s->key[idx] = cur;
 713         } else
 714                 s->key[idx] = sk;
 715
 716         if ((si = pool_get(&pf_state_item_pl, PR_NOWAIT)) == NULL) {
 717                 pf_state_key_detach(s, idx);
 718                 return (-1);
 719         }
 720         si->s = s;
 721
 722         /* list is sorted, if-bound states before floating */
 723         if (s->kif == pfi_all)
 724                 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry);
 725         else
 726                 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry);
 727         return (0);
 728 }
 729
 730 void
 731 pf_detach_state(struct pf_state *s)
 732 {
 733         if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK])
 734                 s->key[PF_SK_WIRE] = NULL;
 735
 736         if (s->key[PF_SK_STACK] != NULL)
 737                 pf_state_key_detach(s, PF_SK_STACK);
 738
 739         if (s->key[PF_SK_WIRE] != NULL)
 740                 pf_state_key_detach(s, PF_SK_WIRE);
 741 }
 742
 743 void
 744 pf_state_key_detach(struct pf_state *s, int idx)
 745 {
 746         struct pf_state_item    *si;
 747
 748         si = TAILQ_FIRST(&s->key[idx]->states);
 749         while (si && si->s != s)
 750             si = TAILQ_NEXT(si, entry);
 751
 752         if (si) {
 753                 TAILQ_REMOVE(&s->key[idx]->states, si, entry);
 754                 pool_put(&pf_state_item_pl, si);
 755         }
 756
 757         if (TAILQ_EMPTY(&s->key[idx]->states)) {
 758                 RB_REMOVE(pf_state_tree, &pf_statetbl, s->key[idx]);
 759                 if (s->key[idx]->reverse)
 760                         s->key[idx]->reverse->reverse = NULL;
 761                 if (s->key[idx]->inp)
 762                         s->key[idx]->inp->inp_pf_sk = NULL;
 763                 pool_put(&pf_state_key_pl, s->key[idx]);
 764         }
 765         s->key[idx] = NULL;
 766 }
 767
 768 struct pf_state_key *
 769 pf_alloc_state_key(int pool_flags)
 770 {
 771         struct pf_state_key     *sk;
 772
 773         if ((sk = pool_get(&pf_state_key_pl, pool_flags)) == NULL)
 774                 return (NULL);
 775         TAILQ_INIT(&sk->states);
 776
 777         return (sk);
 778 }
 779
 780 int
 781 pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr,
 782         struct pf_state_key **skw, struct pf_state_key **sks,
 783         struct pf_state_key **skp, struct pf_state_key **nkp,
 784         struct pf_addr *saddr, struct pf_addr *daddr,
 785         u_int16_t sport, u_int16_t dport)
 786 {
 787         KKASSERT((*skp == NULL && *nkp == NULL));
 788
 789         if ((*skp = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL)
 790                 return (ENOMEM);
 791
 792         PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af);
 793         PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af);
 794         (*skp)->port[pd->sidx] = sport;
 795         (*skp)->port[pd->didx] = dport;
 796         (*skp)->proto = pd->proto;
 797         (*skp)->af = pd->af;
 798
 799         if (nr != NULL) {
 800                 if ((*nkp = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL)
 801                         return (ENOMEM); /* caller must handle cleanup */
 802
 803                 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */
 804                 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af);
 805                 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af);
 806                 (*nkp)->port[0] = (*skp)->port[0];
 807                 (*nkp)->port[1] = (*skp)->port[1];
 808                 (*nkp)->proto = pd->proto;
 809                 (*nkp)->af = pd->af;
 810         } else
 811                 *nkp = *skp;
 812
 813         if (pd->dir == PF_IN) {
 814                 *skw = *skp;
 815                 *sks = *nkp;
 816         } else {
 817                 *sks = *skp;
 818                 *skw = *nkp;
 819         }
 820         return (0);
 821 }
 822
 823
 824 int
 825 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
 826     struct pf_state_key *sks, struct pf_state *s)
 827 {
 828         s->kif = kif;
 829
 830         if (skw == sks) {
 831                 if (pf_state_key_attach(skw, s, PF_SK_WIRE))
 832                         return (-1);
 833                 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
 834         } else {
 835                 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) {
 836                         pool_put(&pf_state_key_pl, sks);
 837                         return (-1);
 838                 }
 839                 if (pf_state_key_attach(sks, s, PF_SK_STACK)) {
 840                         pf_state_key_detach(s, PF_SK_WIRE);
 841                         return (-1);
 842                 }
 843         }
 844
 845         if (s->id == 0 && s->creatorid == 0) {
 846                 s->id = htobe64(pf_status.stateid++);
 847                 s->creatorid = pf_status.hostid;
 848         }
 849
 850         /*
 851          * Calculate hash code for altq
 852          */
 853         s->hash = crc32(s->key[PF_SK_WIRE], sizeof(*sks));
 854
 855         if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) {
 856                 if (pf_status.debug >= PF_DEBUG_MISC) {
 857                         kprintf("pf: state insert failed: "
 858                             "id: %016jx creatorid: %08x",
 859                               (uintmax_t)be64toh(s->id), ntohl(s->creatorid));
 860                         if (s->sync_flags & PFSTATE_FROMSYNC)
 861                                 kprintf(" (from sync)");
 862                         kprintf("\n");
 863                 }
 864                 pf_detach_state(s);
 865                 return (-1);
 866         }
 867         TAILQ_INSERT_TAIL(&state_list, s, entry_list);
 868         pf_status.fcounters[FCNT_STATE_INSERT]++;
 869         pf_status.states++;
 870         pfi_kif_ref(kif, PFI_KIF_REF_STATE);
 871         pfsync_insert_state(s);
 872         return (0);
 873 }
 874
 875 struct pf_state *
 876 pf_find_state_byid(struct pf_state_cmp *key)
 877 {
 878         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 879
 880         return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
 881 }
 882
 883 struct pf_state *
 884 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir,
 885     struct mbuf *m)
 886 {
 887         struct pf_state_key     *sk;
 888         struct pf_state_item    *si;
 889
 890         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 891
 892         if (dir == PF_OUT && m->m_pkthdr.pf.statekey &&
 893             ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse)
 894                 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse;
 895         else {
 896                 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl,
 897                     (struct pf_state_key *)key)) == NULL)
 898                         return (NULL);
 899                 if (dir == PF_OUT && m->m_pkthdr.pf.statekey) {
 900                         ((struct pf_state_key *)
 901                             m->m_pkthdr.pf.statekey)->reverse = sk;
 902                         sk->reverse = m->m_pkthdr.pf.statekey;
 903                 }
 904         }
 905
 906         if (dir == PF_OUT)
 907                 m->m_pkthdr.pf.statekey = NULL;
 908
 909         /* list is sorted, if-bound states before floating ones */
 910         TAILQ_FOREACH(si, &sk->states, entry)
 911                 if ((si->s->kif == pfi_all || si->s->kif == kif) &&
 912                     sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
 913                     si->s->key[PF_SK_STACK]))
 914                         return (si->s);
 915
 916         return (NULL);
 917 }
 918
 919 struct pf_state *
 920 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
 921 {
 922         struct pf_state_key     *sk;
 923         struct pf_state_item    *si, *ret = NULL;
 924
 925         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 926
 927         sk = RB_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key);
 928
 929         if (sk != NULL) {
 930                 TAILQ_FOREACH(si, &sk->states, entry)
 931                         if (dir == PF_INOUT ||
 932                             (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
 933                             si->s->key[PF_SK_STACK]))) {
 934                                 if (more == NULL)
 935                                         return (si->s);
 936
 937                                 if (ret)
 938                                         (*more)++;
 939                                 else
 940                                         ret = si;
 941                         }
 942         }
 943         return (ret ? ret->s : NULL);
 944 }
 945
 946 /* END state table stuff */
 947
 948
 949 void
 950 pf_purge_thread(void *v)
 951 {
 952         int nloops = 0;
 953         int locked = 0;
 954
 955         lwkt_gettoken(&pf_token);
 956         for (;;) {
 957                 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz);
 958
 959                 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
 960
 961                 if (pf_end_threads) {
 962                         pf_purge_expired_states(pf_status.states, 1);
 963                         pf_purge_expired_fragments();
 964                         pf_purge_expired_src_nodes(1);
 965                         pf_end_threads++;
 966
 967                         lockmgr(&pf_consistency_lock, LK_RELEASE);
 968                         wakeup(pf_purge_thread);
 969                         kthread_exit();
 970                 }
 971                 crit_enter();
 972
 973                 /* process a fraction of the state table every second */
 974                 if(!pf_purge_expired_states(1 + (pf_status.states
 975                     / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) {
 976
 977                         pf_purge_expired_states(1 + (pf_status.states
 978                             / pf_default_rule.timeout[PFTM_INTERVAL]), 1);
 979                 }
 980
 981                 /* purge other expired types every PFTM_INTERVAL seconds */
 982                 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
 983                         pf_purge_expired_fragments();
 984                         if (!pf_purge_expired_src_nodes(locked)) {
 985                                 pf_purge_expired_src_nodes(1);
 986                         }
 987                         nloops = 0;
 988                 }
 989                 crit_exit();
 990                 lockmgr(&pf_consistency_lock, LK_RELEASE);
 991         }
 992         lwkt_reltoken(&pf_token);
 993 }
 994
 995 u_int32_t
 996 pf_state_expires(const struct pf_state *state)
 997 {
 998         u_int32_t       timeout;
 999         u_int32_t       start;
1000         u_int32_t       end;
1001         u_int32_t       states;
1002
1003         /* handle all PFTM_* > PFTM_MAX here */
1004         if (state->timeout == PFTM_PURGE)
1005                 return (time_second);
1006         if (state->timeout == PFTM_UNTIL_PACKET)
1007                 return (0);
1008         KKASSERT(state->timeout != PFTM_UNLINKED);
1009         KKASSERT(state->timeout < PFTM_MAX);
1010         timeout = state->rule.ptr->timeout[state->timeout];
1011         if (!timeout)
1012                 timeout = pf_default_rule.timeout[state->timeout];
1013         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1014         if (start) {
1015                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1016                 states = state->rule.ptr->states_cur;
1017         } else {
1018                 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1019                 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1020                 states = pf_status.states;
1021         }
1022         if (end && states > start && start < end) {
1023                 if (states < end)
1024                         return (state->expire + timeout * (end - states) /
1025                             (end - start));
1026                 else
1027                         return (time_second);
1028         }
1029         return (state->expire + timeout);
1030 }
1031
1032 int
1033 pf_purge_expired_src_nodes(int waslocked)
1034 {
1035          struct pf_src_node             *cur, *next;
1036          int                             locked = waslocked;
1037
1038          for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
1039                  next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
1040
1041                  if (cur->states <= 0 && cur->expire <= time_second) {
1042                          if (! locked) {
1043                                  lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1044                                  next = RB_NEXT(pf_src_tree,
1045                                      &tree_src_tracking, cur);
1046                                  locked = 1;
1047                          }
1048                          if (cur->rule.ptr != NULL) {
1049                                  cur->rule.ptr->src_nodes--;
1050                                  if (cur->rule.ptr->states_cur <= 0 &&
1051                                      cur->rule.ptr->max_src_nodes <= 0)
1052                                          pf_rm_rule(NULL, cur->rule.ptr);
1053                          }
1054                          RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
1055                          pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
1056                          pf_status.src_nodes--;
1057                          pool_put(&pf_src_tree_pl, cur);
1058                  }
1059          }
1060
1061          if (locked && !waslocked)
1062                 lockmgr(&pf_consistency_lock, LK_RELEASE);
1063         return(1);
1064 }
1065
1066 void
1067 pf_src_tree_remove_state(struct pf_state *s)
1068 {
1069         u_int32_t timeout;
1070
1071         if (s->src_node != NULL) {
1072                 if (s->src.tcp_est)
1073                         --s->src_node->conn;
1074                 if (--s->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->src_node->expire = time_second + timeout;
1080                 }
1081         }
1082         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1083                 if (--s->nat_src_node->states <= 0) {
1084                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1085                         if (!timeout)
1086                                 timeout =
1087                                     pf_default_rule.timeout[PFTM_SRC_NODE];
1088                         s->nat_src_node->expire = time_second + timeout;
1089                 }
1090         }
1091         s->src_node = s->nat_src_node = NULL;
1092 }
1093
1094 /* callers should be at crit_enter() */
1095 void
1096 pf_unlink_state(struct pf_state *cur)
1097 {
1098         if (cur->src.state == PF_TCPS_PROXY_DST) {
1099                 /* XXX wire key the right one? */
1100                 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af,
1101                     &cur->key[PF_SK_WIRE]->addr[1],
1102                     &cur->key[PF_SK_WIRE]->addr[0],
1103                     cur->key[PF_SK_WIRE]->port[1],
1104                     cur->key[PF_SK_WIRE]->port[0],
1105                     cur->src.seqhi, cur->src.seqlo + 1,
1106                     TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
1107         }
1108         RB_REMOVE(pf_state_tree_id, &tree_id, cur);
1109         if (cur->creatorid == pf_status.hostid)
1110                 pfsync_delete_state(cur);
1111         cur->timeout = PFTM_UNLINKED;
1112         pf_src_tree_remove_state(cur);
1113         pf_detach_state(cur);
1114 }
1115
1116 static struct pf_state  *purge_cur;
1117
1118 /* callers should be at crit_enter() and hold the
1119  * write_lock on pf_consistency_lock */
1120 void
1121 pf_free_state(struct pf_state *cur)
1122 {
1123         if (pfsyncif != NULL &&
1124             (pfsyncif->sc_bulk_send_next == cur ||
1125             pfsyncif->sc_bulk_terminator == cur))
1126                 return;
1127         KKASSERT(cur->timeout == PFTM_UNLINKED);
1128         if (--cur->rule.ptr->states_cur <= 0 &&
1129             cur->rule.ptr->src_nodes <= 0)
1130                 pf_rm_rule(NULL, cur->rule.ptr);
1131         if (cur->nat_rule.ptr != NULL)
1132                 if (--cur->nat_rule.ptr->states_cur <= 0 &&
1133                         cur->nat_rule.ptr->src_nodes <= 0)
1134                         pf_rm_rule(NULL, cur->nat_rule.ptr);
1135         if (cur->anchor.ptr != NULL)
1136                 if (--cur->anchor.ptr->states_cur <= 0)
1137                         pf_rm_rule(NULL, cur->anchor.ptr);
1138         pf_normalize_tcp_cleanup(cur);
1139         pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE);
1140
1141         /*
1142          * We may be freeing pf_purge_expired_states()'s saved scan entry,
1143          * adjust it if necessary.
1144          */
1145         if (purge_cur == cur) {
1146                 kprintf("PURGE CONFLICT\n");
1147                 purge_cur = TAILQ_NEXT(purge_cur, entry_list);
1148         }
1149         TAILQ_REMOVE(&state_list, cur, entry_list);
1150         if (cur->tag)
1151                 pf_tag_unref(cur->tag);
1152         pool_put(&pf_state_pl, cur);
1153         pf_status.fcounters[FCNT_STATE_REMOVALS]++;
1154         pf_status.states--;
1155 }
1156
1157 int
1158 pf_purge_expired_states(u_int32_t maxcheck, int waslocked)
1159 {
1160         struct pf_state         *cur;
1161         int                      locked = waslocked;
1162
1163         while (maxcheck--) {
1164                 /*
1165                  * Wrap to start of list when we hit the end
1166                  */
1167                 cur = purge_cur;
1168                 if (cur == NULL) {
1169                         cur = TAILQ_FIRST(&state_list);
1170                         if (cur == NULL)
1171                                 break;  /* list empty */
1172                 }
1173
1174                 /*
1175                  * Setup next (purge_cur) while we process this one.  If we block and
1176                  * something else deletes purge_cur, pf_free_state() will adjust it further
1177                  * ahead.
1178                  */
1179                 purge_cur = TAILQ_NEXT(cur, entry_list);
1180
1181                 if (cur->timeout == PFTM_UNLINKED) {
1182                         /* free unlinked state */
1183                         if (! locked) {
1184                                 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1185                                 locked = 1;
1186                         }
1187                         pf_free_state(cur);
1188                 } else if (pf_state_expires(cur) <= time_second) {
1189                         /* unlink and free expired state */
1190                         pf_unlink_state(cur);
1191                         if (! locked) {
1192                                 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE))
1193                                         return (0);
1194                                 locked = 1;
1195                         }
1196                         pf_free_state(cur);
1197                 }
1198         }
1199
1200         if (locked)
1201                 lockmgr(&pf_consistency_lock, LK_RELEASE);
1202         return (1);
1203 }
1204
1205 int
1206 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
1207 {
1208         if (aw->type != PF_ADDR_TABLE)
1209                 return (0);
1210         if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
1211                 return (1);
1212         return (0);
1213 }
1214
1215 void
1216 pf_tbladdr_remove(struct pf_addr_wrap *aw)
1217 {
1218         if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
1219                 return;
1220         pfr_detach_table(aw->p.tbl);
1221         aw->p.tbl = NULL;
1222 }
1223
1224 void
1225 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
1226 {
1227         struct pfr_ktable *kt = aw->p.tbl;
1228
1229         if (aw->type != PF_ADDR_TABLE || kt == NULL)
1230                 return;
1231         if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
1232                 kt = kt->pfrkt_root;
1233         aw->p.tbl = NULL;
1234         aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
1235                 kt->pfrkt_cnt : -1;
1236 }
1237
1238 void
1239 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1240 {
1241         switch (af) {
1242 #ifdef INET
1243         case AF_INET: {
1244                 u_int32_t a = ntohl(addr->addr32[0]);
1245                 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1246                     (a>>8)&255, a&255);
1247                 if (p) {
1248                         p = ntohs(p);
1249                         kprintf(":%u", p);
1250                 }
1251                 break;
1252         }
1253 #endif /* INET */
1254 #ifdef INET6
1255         case AF_INET6: {
1256                 u_int16_t b;
1257                 u_int8_t i, curstart = 255, curend = 0,
1258                     maxstart = 0, maxend = 0;
1259                 for (i = 0; i < 8; i++) {
1260                         if (!addr->addr16[i]) {
1261                                 if (curstart == 255)
1262                                         curstart = i;
1263                                 else
1264                                         curend = i;
1265                         } else {
1266                                 if (curstart) {
1267                                         if ((curend - curstart) >
1268                                             (maxend - maxstart)) {
1269                                                 maxstart = curstart;
1270                                                 maxend = curend;
1271                                                 curstart = 255;
1272                                         }
1273                                 }
1274                         }
1275                 }
1276                 for (i = 0; i < 8; i++) {
1277                         if (i >= maxstart && i <= maxend) {
1278                                 if (maxend != 7) {
1279                                         if (i == maxstart)
1280                                                 kprintf(":");
1281                                 } else {
1282                                         if (i == maxend)
1283                                                 kprintf(":");
1284                                 }
1285                         } else {
1286                                 b = ntohs(addr->addr16[i]);
1287                                 kprintf("%x", b);
1288                                 if (i < 7)
1289                                         kprintf(":");
1290                         }
1291                 }
1292                 if (p) {
1293                         p = ntohs(p);
1294                         kprintf("[%u]", p);
1295                 }
1296                 break;
1297         }
1298 #endif /* INET6 */
1299         }
1300 }
1301
1302 void
1303 pf_print_state(struct pf_state *s)
1304 {
1305         pf_print_state_parts(s, NULL, NULL);
1306 }
1307
1308 void
1309 pf_print_state_parts(struct pf_state *s,
1310     struct pf_state_key *skwp, struct pf_state_key *sksp)
1311 {
1312         struct pf_state_key *skw, *sks;
1313         u_int8_t proto, dir;
1314
1315         /* Do our best to fill these, but they're skipped if NULL */
1316         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1317         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1318         proto = skw ? skw->proto : (sks ? sks->proto : 0);
1319         dir = s ? s->direction : 0;
1320
1321         switch (proto) {
1322         case IPPROTO_TCP:
1323                 kprintf("TCP ");
1324                 break;
1325         case IPPROTO_UDP:
1326                 kprintf("UDP ");
1327                 break;
1328         case IPPROTO_ICMP:
1329                 kprintf("ICMP ");
1330                 break;
1331         case IPPROTO_ICMPV6:
1332                 kprintf("ICMPV6 ");
1333                 break;
1334         default:
1335                 kprintf("%u ", skw->proto);
1336                 break;
1337         }
1338         switch (dir) {
1339         case PF_IN:
1340                 kprintf(" in");
1341                 break;
1342         case PF_OUT:
1343                 kprintf(" out");
1344                 break;
1345         }
1346         if (skw) {
1347                 kprintf(" wire: ");
1348                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1349                 kprintf(" ");
1350                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1351         }
1352         if (sks) {
1353                 kprintf(" stack: ");
1354                 if (sks != skw) {
1355                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1356                         kprintf(" ");
1357                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1358                 } else
1359                         kprintf("-");
1360         }
1361         if (s) {
1362                 if (proto == IPPROTO_TCP) {
1363                         kprintf(" [lo=%u high=%u win=%u modulator=%u",
1364                             s->src.seqlo, s->src.seqhi,
1365                             s->src.max_win, s->src.seqdiff);
1366                         if (s->src.wscale && s->dst.wscale)
1367                                 kprintf(" wscale=%u",
1368                                     s->src.wscale & PF_WSCALE_MASK);
1369                         kprintf("]");
1370                         kprintf(" [lo=%u high=%u win=%u modulator=%u",
1371                             s->dst.seqlo, s->dst.seqhi,
1372                             s->dst.max_win, s->dst.seqdiff);
1373                         if (s->src.wscale && s->dst.wscale)
1374                                 kprintf(" wscale=%u",
1375                                 s->dst.wscale & PF_WSCALE_MASK);
1376                         kprintf("]");
1377                 }
1378                 kprintf(" %u:%u", s->src.state, s->dst.state);
1379         }
1380 }
1381
1382 void
1383 pf_print_flags(u_int8_t f)
1384 {
1385         if (f)
1386                 kprintf(" ");
1387         if (f & TH_FIN)
1388                 kprintf("F");
1389         if (f & TH_SYN)
1390                 kprintf("S");
1391         if (f & TH_RST)
1392                 kprintf("R");
1393         if (f & TH_PUSH)
1394                 kprintf("P");
1395         if (f & TH_ACK)
1396                 kprintf("A");
1397         if (f & TH_URG)
1398                 kprintf("U");
1399         if (f & TH_ECE)
1400                 kprintf("E");
1401         if (f & TH_CWR)
1402                 kprintf("W");
1403 }
1404
1405 #define PF_SET_SKIP_STEPS(i)                                    \
1406         do {                                                    \
1407                 while (head[i] != cur) {                        \
1408                         head[i]->skip[i].ptr = cur;             \
1409                         head[i] = TAILQ_NEXT(head[i], entries); \
1410                 }                                               \
1411         } while (0)
1412
1413 void
1414 pf_calc_skip_steps(struct pf_rulequeue *rules)
1415 {
1416         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1417         int i;
1418
1419         cur = TAILQ_FIRST(rules);
1420         prev = cur;
1421         for (i = 0; i < PF_SKIP_COUNT; ++i)
1422                 head[i] = cur;
1423         while (cur != NULL) {
1424
1425                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1426                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1427                 if (cur->direction != prev->direction)
1428                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1429                 if (cur->af != prev->af)
1430                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
1431                 if (cur->proto != prev->proto)
1432                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1433                 if (cur->src.neg != prev->src.neg ||
1434                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1435                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1436                 if (cur->src.port[0] != prev->src.port[0] ||
1437                     cur->src.port[1] != prev->src.port[1] ||
1438                     cur->src.port_op != prev->src.port_op)
1439                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1440                 if (cur->dst.neg != prev->dst.neg ||
1441                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1442                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1443                 if (cur->dst.port[0] != prev->dst.port[0] ||
1444                     cur->dst.port[1] != prev->dst.port[1] ||
1445                     cur->dst.port_op != prev->dst.port_op)
1446                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1447
1448                 prev = cur;
1449                 cur = TAILQ_NEXT(cur, entries);
1450         }
1451         for (i = 0; i < PF_SKIP_COUNT; ++i)
1452                 PF_SET_SKIP_STEPS(i);
1453 }
1454
1455 int
1456 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1457 {
1458         if (aw1->type != aw2->type)
1459                 return (1);
1460         switch (aw1->type) {
1461         case PF_ADDR_ADDRMASK:
1462         case PF_ADDR_RANGE:
1463                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1464                         return (1);
1465                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1466                         return (1);
1467                 return (0);
1468         case PF_ADDR_DYNIFTL:
1469                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1470         case PF_ADDR_NOROUTE:
1471         case PF_ADDR_URPFFAILED:
1472                 return (0);
1473         case PF_ADDR_TABLE:
1474                 return (aw1->p.tbl != aw2->p.tbl);
1475         case PF_ADDR_RTLABEL:
1476                 return (aw1->v.rtlabel != aw2->v.rtlabel);
1477         default:
1478                 kprintf("invalid address type: %d\n", aw1->type);
1479                 return (1);
1480         }
1481 }
1482
1483 u_int16_t
1484 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1485 {
1486         u_int32_t       l;
1487
1488         if (udp && !cksum)
1489                 return (0x0000);
1490         l = cksum + old - new;
1491         l = (l >> 16) + (l & 65535);
1492         l = l & 65535;
1493         if (udp && !l)
1494                 return (0xFFFF);
1495         return (l);
1496 }
1497
1498 void
1499 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1500     struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1501 {
1502         struct pf_addr  ao;
1503         u_int16_t       po = *p;
1504
1505         PF_ACPY(&ao, a, af);
1506         PF_ACPY(a, an, af);
1507
1508         *p = pn;
1509
1510         switch (af) {
1511 #ifdef INET
1512         case AF_INET:
1513                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1514                     ao.addr16[0], an->addr16[0], 0),
1515                     ao.addr16[1], an->addr16[1], 0);
1516                 *p = pn;
1517                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1518                     ao.addr16[0], an->addr16[0], u),
1519                     ao.addr16[1], an->addr16[1], u),
1520                     po, pn, u);
1521                 break;
1522 #endif /* INET */
1523 #ifdef INET6
1524         case AF_INET6:
1525                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1526                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1527                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1528                     ao.addr16[0], an->addr16[0], u),
1529                     ao.addr16[1], an->addr16[1], u),
1530                     ao.addr16[2], an->addr16[2], u),
1531                     ao.addr16[3], an->addr16[3], u),
1532                     ao.addr16[4], an->addr16[4], u),
1533                     ao.addr16[5], an->addr16[5], u),
1534                     ao.addr16[6], an->addr16[6], u),
1535                     ao.addr16[7], an->addr16[7], u),
1536                     po, pn, u);
1537                 break;
1538 #endif /* INET6 */
1539         }
1540 }
1541
1542
1543 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
1544 void
1545 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1546 {
1547         u_int32_t       ao;
1548
1549         memcpy(&ao, a, sizeof(ao));
1550         memcpy(a, &an, sizeof(u_int32_t));
1551         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1552             ao % 65536, an % 65536, u);
1553 }
1554
1555 #ifdef INET6
1556 void
1557 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1558 {
1559         struct pf_addr  ao;
1560
1561         PF_ACPY(&ao, a, AF_INET6);
1562         PF_ACPY(a, an, AF_INET6);
1563
1564         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1565             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1566             pf_cksum_fixup(pf_cksum_fixup(*c,
1567             ao.addr16[0], an->addr16[0], u),
1568             ao.addr16[1], an->addr16[1], u),
1569             ao.addr16[2], an->addr16[2], u),
1570             ao.addr16[3], an->addr16[3], u),
1571             ao.addr16[4], an->addr16[4], u),
1572             ao.addr16[5], an->addr16[5], u),
1573             ao.addr16[6], an->addr16[6], u),
1574             ao.addr16[7], an->addr16[7], u);
1575 }
1576 #endif /* INET6 */
1577
1578 void
1579 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1580     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1581     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1582 {
1583         struct pf_addr  oia, ooa;
1584
1585         PF_ACPY(&oia, ia, af);
1586         if (oa)
1587                 PF_ACPY(&ooa, oa, af);
1588
1589         /* Change inner protocol port, fix inner protocol checksum. */
1590         if (ip != NULL) {
1591                 u_int16_t       oip = *ip;
1592                 u_int32_t       opc = 0;
1593
1594                 if (pc != NULL)
1595                         opc = *pc;
1596                 *ip = np;
1597                 if (pc != NULL)
1598                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1599                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1600                 if (pc != NULL)
1601                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1602         }
1603         /* Change inner ip address, fix inner ip and icmp checksums. */
1604         PF_ACPY(ia, na, af);
1605         switch (af) {
1606 #ifdef INET
1607         case AF_INET: {
1608                 u_int32_t        oh2c = *h2c;
1609
1610                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1611                     oia.addr16[0], ia->addr16[0], 0),
1612                     oia.addr16[1], ia->addr16[1], 0);
1613                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1614                     oia.addr16[0], ia->addr16[0], 0),
1615                     oia.addr16[1], ia->addr16[1], 0);
1616                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1617                 break;
1618         }
1619 #endif /* INET */
1620 #ifdef INET6
1621         case AF_INET6:
1622                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1623                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1624                     pf_cksum_fixup(pf_cksum_fixup(*ic,
1625                     oia.addr16[0], ia->addr16[0], u),
1626                     oia.addr16[1], ia->addr16[1], u),
1627                     oia.addr16[2], ia->addr16[2], u),
1628                     oia.addr16[3], ia->addr16[3], u),
1629                     oia.addr16[4], ia->addr16[4], u),
1630                     oia.addr16[5], ia->addr16[5], u),
1631                     oia.addr16[6], ia->addr16[6], u),
1632                     oia.addr16[7], ia->addr16[7], u);
1633                 break;
1634 #endif /* INET6 */
1635         }
1636         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
1637         if (oa) {
1638                 PF_ACPY(oa, na, af);
1639                 switch (af) {
1640 #ifdef INET
1641                 case AF_INET:
1642                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1643                             ooa.addr16[0], oa->addr16[0], 0),
1644                             ooa.addr16[1], oa->addr16[1], 0);
1645                         break;
1646 #endif /* INET */
1647 #ifdef INET6
1648                 case AF_INET6:
1649                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1650                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1651                             pf_cksum_fixup(pf_cksum_fixup(*ic,
1652                             ooa.addr16[0], oa->addr16[0], u),
1653                             ooa.addr16[1], oa->addr16[1], u),
1654                             ooa.addr16[2], oa->addr16[2], u),
1655                             ooa.addr16[3], oa->addr16[3], u),
1656                             ooa.addr16[4], oa->addr16[4], u),
1657                             ooa.addr16[5], oa->addr16[5], u),
1658                             ooa.addr16[6], oa->addr16[6], u),
1659                             ooa.addr16[7], oa->addr16[7], u);
1660                         break;
1661 #endif /* INET6 */
1662                 }
1663         }
1664 }
1665
1666
1667 /*
1668  * Need to modulate the sequence numbers in the TCP SACK option
1669  * (credits to Krzysztof Pfaff for report and patch)
1670  */
1671 int
1672 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
1673     struct tcphdr *th, struct pf_state_peer *dst)
1674 {
1675         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
1676         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
1677         int copyback = 0, i, olen;
1678         struct raw_sackblock sack;
1679
1680 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
1681         if (hlen < TCPOLEN_SACKLEN ||
1682             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
1683                 return 0;
1684
1685         while (hlen >= TCPOLEN_SACKLEN) {
1686                 olen = opt[1];
1687                 switch (*opt) {
1688                 case TCPOPT_EOL:        /* FALLTHROUGH */
1689                 case TCPOPT_NOP:
1690                         opt++;
1691                         hlen--;
1692                         break;
1693                 case TCPOPT_SACK:
1694                         if (olen > hlen)
1695                                 olen = hlen;
1696                         if (olen >= TCPOLEN_SACKLEN) {
1697                                 for (i = 2; i + TCPOLEN_SACK <= olen;
1698                                     i += TCPOLEN_SACK) {
1699                                         memcpy(&sack, &opt[i], sizeof(sack));
1700                                         pf_change_a(&sack.rblk_start, &th->th_sum,
1701                                             htonl(ntohl(sack.rblk_start) -
1702                                             dst->seqdiff), 0);
1703                                         pf_change_a(&sack.rblk_end, &th->th_sum,
1704                                             htonl(ntohl(sack.rblk_end) -
1705                                             dst->seqdiff), 0);
1706                                         memcpy(&opt[i], &sack, sizeof(sack));
1707                                 }
1708                                 copyback = 1;
1709                         }
1710                         /* FALLTHROUGH */
1711                 default:
1712                         if (olen < 2)
1713                                 olen = 2;
1714                         hlen -= olen;
1715                         opt += olen;
1716                 }
1717         }
1718
1719         if (copyback)
1720                 m_copyback(m, off + sizeof(*th), thoptlen, opts);
1721         return (copyback);
1722 }
1723
1724 void
1725 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1726     const struct pf_addr *saddr, const struct pf_addr *daddr,
1727     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1728     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
1729     u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
1730 {
1731         struct mbuf     *m;
1732         int              len = 0, tlen;
1733 #ifdef INET
1734         struct ip       *h = NULL;
1735 #endif /* INET */
1736 #ifdef INET6
1737         struct ip6_hdr  *h6 = NULL;
1738 #endif /* INET6 */
1739         struct tcphdr   *th = NULL;
1740         char            *opt;
1741
1742         ASSERT_LWKT_TOKEN_HELD(&pf_token);
1743
1744         /* maximum segment size tcp option */
1745         tlen = sizeof(struct tcphdr);
1746         if (mss)
1747                 tlen += 4;
1748
1749         switch (af) {
1750 #ifdef INET
1751         case AF_INET:
1752                 len = sizeof(struct ip) + tlen;
1753                 break;
1754 #endif /* INET */
1755 #ifdef INET6
1756         case AF_INET6:
1757                 len = sizeof(struct ip6_hdr) + tlen;
1758                 break;
1759 #endif /* INET6 */
1760         }
1761
1762         /*
1763          * Create outgoing mbuf.
1764          *
1765          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1766          * so make sure pf.flags is clear.
1767          */
1768         m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1769         if (m == NULL) {
1770                 return;
1771         }
1772         if (tag)
1773                 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1774         m->m_pkthdr.pf.flags = 0;
1775         m->m_pkthdr.pf.tag = rtag;
1776         /* XXX Recheck when upgrading to > 4.4 */
1777         m->m_pkthdr.pf.statekey = NULL;
1778         if (r != NULL && r->rtableid >= 0)
1779                 m->m_pkthdr.pf.rtableid = r->rtableid;
1780
1781 #ifdef ALTQ
1782         if (r != NULL && r->qid) {
1783                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1784                 m->m_pkthdr.pf.qid = r->qid;
1785                 m->m_pkthdr.pf.ecn_af = af;
1786                 m->m_pkthdr.pf.hdr = mtod(m, struct ip *);
1787         }
1788 #endif /* ALTQ */
1789         m->m_data += max_linkhdr;
1790         m->m_pkthdr.len = m->m_len = len;
1791         m->m_pkthdr.rcvif = NULL;
1792         bzero(m->m_data, len);
1793         switch (af) {
1794 #ifdef INET
1795         case AF_INET:
1796                 h = mtod(m, struct ip *);
1797
1798                 /* IP header fields included in the TCP checksum */
1799                 h->ip_p = IPPROTO_TCP;
1800                 h->ip_len = tlen;
1801                 h->ip_src.s_addr = saddr->v4.s_addr;
1802                 h->ip_dst.s_addr = daddr->v4.s_addr;
1803
1804                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1805                 break;
1806 #endif /* INET */
1807 #ifdef INET6
1808         case AF_INET6:
1809                 h6 = mtod(m, struct ip6_hdr *);
1810
1811                 /* IP header fields included in the TCP checksum */
1812                 h6->ip6_nxt = IPPROTO_TCP;
1813                 h6->ip6_plen = htons(tlen);
1814                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1815                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1816
1817                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1818                 break;
1819 #endif /* INET6 */
1820         }
1821
1822         /* TCP header */
1823         th->th_sport = sport;
1824         th->th_dport = dport;
1825         th->th_seq = htonl(seq);
1826         th->th_ack = htonl(ack);
1827         th->th_off = tlen >> 2;
1828         th->th_flags = flags;
1829         th->th_win = htons(win);
1830
1831         if (mss) {
1832                 opt = (char *)(th + 1);
1833                 opt[0] = TCPOPT_MAXSEG;
1834                 opt[1] = 4;
1835                 mss = htons(mss);
1836                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1837         }
1838
1839         switch (af) {
1840 #ifdef INET
1841         case AF_INET:
1842                 /* TCP checksum */
1843                 th->th_sum = in_cksum(m, len);
1844
1845                 /* Finish the IP header */
1846                 h->ip_v = 4;
1847                 h->ip_hl = sizeof(*h) >> 2;
1848                 h->ip_tos = IPTOS_LOWDELAY;
1849                 h->ip_len = len;
1850                 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1851                 h->ip_ttl = ttl ? ttl : ip_defttl;
1852                 h->ip_sum = 0;
1853                 if (eh == NULL) {
1854                         lwkt_reltoken(&pf_token);
1855                         ip_output(m, NULL, NULL, 0, NULL, NULL);
1856                         lwkt_gettoken(&pf_token);
1857                 } else {
1858                         struct route             ro;
1859                         struct rtentry           rt;
1860                         struct ether_header     *e = (void *)ro.ro_dst.sa_data;
1861
1862                         if (ifp == NULL) {
1863                                 m_freem(m);
1864                                 return;
1865                         }
1866                         rt.rt_ifp = ifp;
1867                         ro.ro_rt = &rt;
1868                         ro.ro_dst.sa_len = sizeof(ro.ro_dst);
1869                         ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
1870                         bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
1871                         bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
1872                         e->ether_type = eh->ether_type;
1873                         /* XXX_IMPORT: later */
1874                         lwkt_reltoken(&pf_token);
1875                         ip_output(m, (void *)NULL, &ro, 0,
1876                             (void *)NULL, (void *)NULL);
1877                         lwkt_gettoken(&pf_token);
1878                 }
1879                 break;
1880 #endif /* INET */
1881 #ifdef INET6
1882         case AF_INET6:
1883                 /* TCP checksum */
1884                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1885                     sizeof(struct ip6_hdr), tlen);
1886
1887                 h6->ip6_vfc |= IPV6_VERSION;
1888                 h6->ip6_hlim = IPV6_DEFHLIM;
1889
1890                 lwkt_reltoken(&pf_token);
1891                 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
1892                 lwkt_gettoken(&pf_token);
1893                 break;
1894 #endif /* INET6 */
1895         }
1896 }
1897
1898 void
1899 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1900     struct pf_rule *r)
1901 {
1902         struct mbuf     *m0;
1903
1904         /*
1905          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1906          * so make sure pf.flags is clear.
1907          */
1908         if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL)
1909                 return;
1910
1911         m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1912         m0->m_pkthdr.pf.flags = 0;
1913         /* XXX Re-Check when Upgrading to > 4.4 */
1914         m0->m_pkthdr.pf.statekey = NULL;
1915
1916         if (r->rtableid >= 0)
1917                 m0->m_pkthdr.pf.rtableid = r->rtableid;
1918
1919 #ifdef ALTQ
1920         if (r->qid) {
1921                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1922                 m0->m_pkthdr.pf.qid = r->qid;
1923                 m0->m_pkthdr.pf.ecn_af = af;
1924                 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *);
1925         }
1926 #endif /* ALTQ */
1927
1928         switch (af) {
1929 #ifdef INET
1930         case AF_INET:
1931                 icmp_error(m0, type, code, 0, 0);
1932                 break;
1933 #endif /* INET */
1934 #ifdef INET6
1935         case AF_INET6:
1936                 icmp6_error(m0, type, code, 0);
1937                 break;
1938 #endif /* INET6 */
1939         }
1940 }
1941
1942 /*
1943  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1944  * If n is 0, they match if they are equal. If n is != 0, they match if they
1945  * are different.
1946  */
1947 int
1948 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1949     struct pf_addr *b, sa_family_t af)
1950 {
1951         int     match = 0;
1952
1953         switch (af) {
1954 #ifdef INET
1955         case AF_INET:
1956                 if ((a->addr32[0] & m->addr32[0]) ==
1957                     (b->addr32[0] & m->addr32[0]))
1958                         match++;
1959                 break;
1960 #endif /* INET */
1961 #ifdef INET6
1962         case AF_INET6:
1963                 if (((a->addr32[0] & m->addr32[0]) ==
1964                      (b->addr32[0] & m->addr32[0])) &&
1965                     ((a->addr32[1] & m->addr32[1]) ==
1966                      (b->addr32[1] & m->addr32[1])) &&
1967                     ((a->addr32[2] & m->addr32[2]) ==
1968                      (b->addr32[2] & m->addr32[2])) &&
1969                     ((a->addr32[3] & m->addr32[3]) ==
1970                      (b->addr32[3] & m->addr32[3])))
1971                         match++;
1972                 break;
1973 #endif /* INET6 */
1974         }
1975         if (match) {
1976                 if (n)
1977                         return (0);
1978                 else
1979                         return (1);
1980         } else {
1981                 if (n)
1982                         return (1);
1983                 else
1984                         return (0);
1985         }
1986 }
1987
1988 /*
1989  * Return 1 if b <= a <= e, otherwise return 0.
1990  */
1991 int
1992 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
1993     struct pf_addr *a, sa_family_t af)
1994 {
1995         switch (af) {
1996 #ifdef INET
1997         case AF_INET:
1998                 if ((a->addr32[0] < b->addr32[0]) ||
1999                     (a->addr32[0] > e->addr32[0]))
2000                         return (0);
2001                 break;
2002 #endif /* INET */
2003 #ifdef INET6
2004         case AF_INET6: {
2005                 int     i;
2006
2007                 /* check a >= b */
2008                 for (i = 0; i < 4; ++i)
2009                         if (a->addr32[i] > b->addr32[i])
2010                                 break;
2011                         else if (a->addr32[i] < b->addr32[i])
2012                                 return (0);
2013                 /* check a <= e */
2014                 for (i = 0; i < 4; ++i)
2015                         if (a->addr32[i] < e->addr32[i])
2016                                 break;
2017                         else if (a->addr32[i] > e->addr32[i])
2018                                 return (0);
2019                 break;
2020         }
2021 #endif /* INET6 */
2022         }
2023         return (1);
2024 }
2025
2026 int
2027 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2028 {
2029         switch (op) {
2030         case PF_OP_IRG:
2031                 return ((p > a1) && (p < a2));
2032         case PF_OP_XRG:
2033                 return ((p < a1) || (p > a2));
2034         case PF_OP_RRG:
2035                 return ((p >= a1) && (p <= a2));
2036         case PF_OP_EQ:
2037                 return (p == a1);
2038         case PF_OP_NE:
2039                 return (p != a1);
2040         case PF_OP_LT:
2041                 return (p < a1);
2042         case PF_OP_LE:
2043                 return (p <= a1);
2044         case PF_OP_GT:
2045                 return (p > a1);
2046         case PF_OP_GE:
2047                 return (p >= a1);
2048         }
2049         return (0); /* never reached */
2050 }
2051
2052 int
2053 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2054 {
2055         a1 = ntohs(a1);
2056         a2 = ntohs(a2);
2057         p = ntohs(p);
2058         return (pf_match(op, a1, a2, p));
2059 }
2060
2061 int
2062 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2063 {
2064         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2065                 return (0);
2066         return (pf_match(op, a1, a2, u));
2067 }
2068
2069 int
2070 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2071 {
2072         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2073                 return (0);
2074         return (pf_match(op, a1, a2, g));
2075 }
2076
2077 int
2078 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag)
2079 {
2080         if (*tag == -1)
2081                 *tag = m->m_pkthdr.pf.tag;
2082
2083         return ((!r->match_tag_not && r->match_tag == *tag) ||
2084             (r->match_tag_not && r->match_tag != *tag));
2085 }
2086
2087 int
2088 pf_tag_packet(struct mbuf *m, int tag, int rtableid)
2089 {
2090         if (tag <= 0 && rtableid < 0)
2091                 return (0);
2092
2093         if (tag > 0)
2094                 m->m_pkthdr.pf.tag = tag;
2095         if (rtableid >= 0)
2096                 m->m_pkthdr.pf.rtableid = rtableid;
2097
2098         return (0);
2099 }
2100
2101 void
2102 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
2103     struct pf_rule **r, struct pf_rule **a, int *match)
2104 {
2105         struct pf_anchor_stackframe     *f;
2106
2107         (*r)->anchor->match = 0;
2108         if (match)
2109                 *match = 0;
2110         if (*depth >= sizeof(pf_anchor_stack) /
2111             sizeof(pf_anchor_stack[0])) {
2112                 kprintf("pf_step_into_anchor: stack overflow\n");
2113                 *r = TAILQ_NEXT(*r, entries);
2114                 return;
2115         } else if (*depth == 0 && a != NULL)
2116                 *a = *r;
2117         f = pf_anchor_stack + (*depth)++;
2118         f->rs = *rs;
2119         f->r = *r;
2120         if ((*r)->anchor_wildcard) {
2121                 f->parent = &(*r)->anchor->children;
2122                 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
2123                     NULL) {
2124                         *r = NULL;
2125                         return;
2126                 }
2127                 *rs = &f->child->ruleset;
2128         } else {
2129                 f->parent = NULL;
2130                 f->child = NULL;
2131                 *rs = &(*r)->anchor->ruleset;
2132         }
2133         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2134 }
2135
2136 int
2137 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
2138     struct pf_rule **r, struct pf_rule **a, int *match)
2139 {
2140         struct pf_anchor_stackframe     *f;
2141         int quick = 0;
2142
2143         do {
2144                 if (*depth <= 0)
2145                         break;
2146                 f = pf_anchor_stack + *depth - 1;
2147                 if (f->parent != NULL && f->child != NULL) {
2148                         if (f->child->match ||
2149                             (match != NULL && *match)) {
2150                                 f->r->anchor->match = 1;
2151                                 *match = 0;
2152                         }
2153                         f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
2154                         if (f->child != NULL) {
2155                                 *rs = &f->child->ruleset;
2156                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2157                                 if (*r == NULL)
2158                                         continue;
2159                                 else
2160                                         break;
2161                         }
2162                 }
2163                 (*depth)--;
2164                 if (*depth == 0 && a != NULL)
2165                         *a = NULL;
2166                 *rs = f->rs;
2167                 if (f->r->anchor->match || (match != NULL && *match))
2168                         quick = f->r->quick;
2169                 *r = TAILQ_NEXT(f->r, entries);
2170         } while (*r == NULL);
2171
2172         return (quick);
2173 }
2174
2175 #ifdef INET6
2176 void
2177 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2178     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2179 {
2180         switch (af) {
2181 #ifdef INET
2182         case AF_INET:
2183                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2184                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2185                 break;
2186 #endif /* INET */
2187         case AF_INET6:
2188                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2189                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2190                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2191                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2192                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2193                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2194                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2195                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2196                 break;
2197         }
2198 }
2199
2200 void
2201 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2202 {
2203         switch (af) {
2204 #ifdef INET
2205         case AF_INET:
2206                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2207                 break;
2208 #endif /* INET */
2209         case AF_INET6:
2210                 if (addr->addr32[3] == 0xffffffff) {
2211                         addr->addr32[3] = 0;
2212                         if (addr->addr32[2] == 0xffffffff) {
2213                                 addr->addr32[2] = 0;
2214                                 if (addr->addr32[1] == 0xffffffff) {
2215                                         addr->addr32[1] = 0;
2216                                         addr->addr32[0] =
2217                                             htonl(ntohl(addr->addr32[0]) + 1);
2218                                 } else
2219                                         addr->addr32[1] =
2220                                             htonl(ntohl(addr->addr32[1]) + 1);
2221                         } else
2222                                 addr->addr32[2] =
2223                                     htonl(ntohl(addr->addr32[2]) + 1);
2224                 } else
2225                         addr->addr32[3] =
2226                             htonl(ntohl(addr->addr32[3]) + 1);
2227                 break;
2228         }
2229 }
2230 #endif /* INET6 */
2231
2232 #define mix(a,b,c) \
2233         do {                                    \
2234                 a -= b; a -= c; a ^= (c >> 13); \
2235                 b -= c; b -= a; b ^= (a << 8);  \
2236                 c -= a; c -= b; c ^= (b >> 13); \
2237                 a -= b; a -= c; a ^= (c >> 12); \
2238                 b -= c; b -= a; b ^= (a << 16); \
2239                 c -= a; c -= b; c ^= (b >> 5);  \
2240                 a -= b; a -= c; a ^= (c >> 3);  \
2241                 b -= c; b -= a; b ^= (a << 10); \
2242                 c -= a; c -= b; c ^= (b >> 15); \
2243         } while (0)
2244
2245 /*
2246  * hash function based on bridge_hash in if_bridge.c
2247  */
2248 void
2249 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
2250     struct pf_poolhashkey *key, sa_family_t af)
2251 {
2252         u_int32_t       a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
2253
2254         switch (af) {
2255 #ifdef INET
2256         case AF_INET:
2257                 a += inaddr->addr32[0];
2258                 b += key->key32[1];
2259                 mix(a, b, c);
2260                 hash->addr32[0] = c + key->key32[2];
2261                 break;
2262 #endif /* INET */
2263 #ifdef INET6
2264         case AF_INET6:
2265                 a += inaddr->addr32[0];
2266                 b += inaddr->addr32[2];
2267                 mix(a, b, c);
2268                 hash->addr32[0] = c;
2269                 a += inaddr->addr32[1];
2270                 b += inaddr->addr32[3];
2271                 c += key->key32[1];
2272                 mix(a, b, c);
2273                 hash->addr32[1] = c;
2274                 a += inaddr->addr32[2];
2275                 b += inaddr->addr32[1];
2276                 c += key->key32[2];
2277                 mix(a, b, c);
2278                 hash->addr32[2] = c;
2279                 a += inaddr->addr32[3];
2280                 b += inaddr->addr32[0];
2281                 c += key->key32[3];
2282                 mix(a, b, c);
2283                 hash->addr32[3] = c;
2284                 break;
2285 #endif /* INET6 */
2286         }
2287 }
2288
2289 int
2290 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
2291     struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
2292 {
2293         unsigned char            hash[16];
2294         struct pf_pool          *rpool = &r->rpool;
2295         struct pf_addr          *raddr = &rpool->cur->addr.v.a.addr;
2296         struct pf_addr          *rmask = &rpool->cur->addr.v.a.mask;
2297         struct pf_pooladdr      *acur = rpool->cur;
2298         struct pf_src_node       k;
2299
2300         if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
2301             (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2302                 k.af = af;
2303                 PF_ACPY(&k.addr, saddr, af);
2304                 if (r->rule_flag & PFRULE_RULESRCTRACK ||
2305                     r->rpool.opts & PF_POOL_STICKYADDR)
2306                         k.rule.ptr = r;
2307                 else
2308                         k.rule.ptr = NULL;
2309                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
2310                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
2311                 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
2312                         PF_ACPY(naddr, &(*sn)->raddr, af);
2313                         if (pf_status.debug >= PF_DEBUG_MISC) {
2314                                 kprintf("pf_map_addr: src tracking maps ");
2315                                 pf_print_host(&k.addr, 0, af);
2316                                 kprintf(" to ");
2317                                 pf_print_host(naddr, 0, af);
2318                                 kprintf("\n");
2319                         }
2320                         return (0);
2321                 }
2322         }
2323
2324         if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
2325                 return (1);
2326         if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2327                 switch (af) {
2328 #ifdef INET
2329                 case AF_INET:
2330                         if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
2331                             (rpool->opts & PF_POOL_TYPEMASK) !=
2332                             PF_POOL_ROUNDROBIN)
2333                                 return (1);
2334                          raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
2335                          rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
2336                         break;
2337 #endif /* INET */
2338 #ifdef INET6
2339                 case AF_INET6:
2340                         if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
2341                             (rpool->opts & PF_POOL_TYPEMASK) !=
2342                             PF_POOL_ROUNDROBIN)
2343                                 return (1);
2344                         raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
2345                         rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
2346                         break;
2347 #endif /* INET6 */
2348                 }
2349         } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2350                 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
2351                         return (1); /* unsupported */
2352         } else {
2353                 raddr = &rpool->cur->addr.v.a.addr;
2354                 rmask = &rpool->cur->addr.v.a.mask;
2355         }
2356
2357         switch (rpool->opts & PF_POOL_TYPEMASK) {
2358         case PF_POOL_NONE:
2359                 PF_ACPY(naddr, raddr, af);
2360                 break;
2361         case PF_POOL_BITMASK:
2362                 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
2363                 break;
2364         case PF_POOL_RANDOM:
2365                 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
2366                         switch (af) {
2367 #ifdef INET
2368                         case AF_INET:
2369                                 rpool->counter.addr32[0] = htonl(karc4random());
2370                                 break;
2371 #endif /* INET */
2372 #ifdef INET6
2373                         case AF_INET6:
2374                                 if (rmask->addr32[3] != 0xffffffff)
2375                                         rpool->counter.addr32[3] =
2376                                             htonl(karc4random());
2377                                 else
2378                                         break;
2379                                 if (rmask->addr32[2] != 0xffffffff)
2380                                         rpool->counter.addr32[2] =
2381                                             htonl(karc4random());
2382                                 else
2383                                         break;
2384                                 if (rmask->addr32[1] != 0xffffffff)
2385                                         rpool->counter.addr32[1] =
2386                                             htonl(karc4random());
2387                                 else
2388                                         break;
2389                                 if (rmask->addr32[0] != 0xffffffff)
2390                                         rpool->counter.addr32[0] =
2391                                             htonl(karc4random());
2392                                 break;
2393 #endif /* INET6 */
2394                         }
2395                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2396                         PF_ACPY(init_addr, naddr, af);
2397
2398                 } else {
2399                         PF_AINC(&rpool->counter, af);
2400                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2401                 }
2402                 break;
2403         case PF_POOL_SRCHASH:
2404                 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
2405                 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
2406                 break;
2407         case PF_POOL_ROUNDROBIN:
2408                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2409                         if (!pfr_pool_get(rpool->cur->addr.p.tbl,
2410                             &rpool->tblidx, &rpool->counter,
2411                             &raddr, &rmask, af))
2412                                 goto get_addr;
2413                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2414                         if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2415                             &rpool->tblidx, &rpool->counter,
2416                             &raddr, &rmask, af))
2417                                 goto get_addr;
2418                 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
2419                         goto get_addr;
2420
2421         try_next:
2422                 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
2423                         rpool->cur = TAILQ_FIRST(&rpool->list);
2424                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2425                         rpool->tblidx = -1;
2426                         if (pfr_pool_get(rpool->cur->addr.p.tbl,
2427                             &rpool->tblidx, &rpool->counter,
2428                             &raddr, &rmask, af)) {
2429                                 /* table contains no address of type 'af' */
2430                                 if (rpool->cur != acur)
2431                                         goto try_next;
2432                                 return (1);
2433                         }
2434                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2435                         rpool->tblidx = -1;
2436                         if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2437                             &rpool->tblidx, &rpool->counter,
2438                             &raddr, &rmask, af)) {
2439                                 /* table contains no address of type 'af' */
2440                                 if (rpool->cur != acur)
2441                                         goto try_next;
2442                                 return (1);
2443                         }
2444                 } else {
2445                         raddr = &rpool->cur->addr.v.a.addr;
2446                         rmask = &rpool->cur->addr.v.a.mask;
2447                         PF_ACPY(&rpool->counter, raddr, af);
2448                 }
2449
2450         get_addr:
2451                 PF_ACPY(naddr, &rpool->counter, af);
2452                 if (init_addr != NULL && PF_AZERO(init_addr, af))
2453                         PF_ACPY(init_addr, naddr, af);
2454                 PF_AINC(&rpool->counter, af);
2455                 break;
2456         }
2457         if (*sn != NULL)
2458                 PF_ACPY(&(*sn)->raddr, naddr, af);
2459
2460         if (pf_status.debug >= PF_DEBUG_MISC &&
2461             (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2462                 kprintf("pf_map_addr: selected address ");
2463                 pf_print_host(naddr, 0, af);
2464                 kprintf("\n");
2465         }
2466
2467         return (0);
2468 }
2469
2470 int
2471 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
2472     struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
2473     struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
2474     struct pf_src_node **sn)
2475 {
2476         struct pf_state_key_cmp key;
2477         struct pf_addr          init_addr;
2478         u_int16_t               cut;
2479
2480         bzero(&init_addr, sizeof(init_addr));
2481         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2482                 return (1);
2483
2484         if (proto == IPPROTO_ICMP) {
2485                 low = 1;
2486                 high = 65535;
2487         }
2488
2489         do {
2490                 key.af = af;
2491                 key.proto = proto;
2492                 PF_ACPY(&key.addr[1], daddr, key.af);
2493                 PF_ACPY(&key.addr[0], naddr, key.af);
2494                 key.port[1] = dport;
2495
2496                 /*
2497                  * port search; start random, step;
2498                  * similar 2 portloop in in_pcbbind
2499                  */
2500                 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
2501                     proto == IPPROTO_ICMP)) {
2502                         key.port[0] = dport;
2503                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
2504                                 return (0);
2505                 } else if (low == 0 && high == 0) {
2506                         key.port[0] = *nport;
2507                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
2508                                 return (0);
2509                 } else if (low == high) {
2510                         key.port[0] = htons(low);
2511                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
2512                                 *nport = htons(low);
2513                                 return (0);
2514                         }
2515                 } else {
2516                         u_int16_t tmp;
2517
2518                         if (low > high) {
2519                                 tmp = low;
2520                                 low = high;
2521                                 high = tmp;
2522                         }
2523                         /* low < high */
2524                         cut = htonl(karc4random()) % (1 + high - low) + low;
2525                         /* low <= cut <= high */
2526                         for (tmp = cut; tmp <= high; ++(tmp)) {
2527                                 key.port[0] = htons(tmp);
2528                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
2529                                     NULL && !in_baddynamic(tmp, proto)) {
2530                                         *nport = htons(tmp);
2531                                         return (0);
2532                                 }
2533                         }
2534                         for (tmp = cut - 1; tmp >= low; --(tmp)) {
2535                                 key.port[0] = htons(tmp);
2536                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
2537                                     NULL && !in_baddynamic(tmp, proto)) {
2538                                         *nport = htons(tmp);
2539                                         return (0);
2540                                 }
2541                         }
2542                 }
2543
2544                 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
2545                 case PF_POOL_RANDOM:
2546                 case PF_POOL_ROUNDROBIN:
2547                         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2548                                 return (1);
2549                         break;
2550                 case PF_POOL_NONE:
2551                 case PF_POOL_SRCHASH:
2552                 case PF_POOL_BITMASK:
2553                 default:
2554                         return (1);
2555                 }
2556         } while (! PF_AEQ(&init_addr, naddr, af) );
2557         return (1);                                     /* none available */
2558 }
2559
2560 struct pf_rule *
2561 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
2562     int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
2563     struct pf_addr *daddr, u_int16_t dport, int rs_num)
2564 {
2565         struct pf_rule          *r, *rm = NULL;
2566         struct pf_ruleset       *ruleset = NULL;
2567         int                      tag = -1;
2568         int                      rtableid = -1;
2569         int                      asd = 0;
2570
2571         r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
2572         while (r && rm == NULL) {
2573                 struct pf_rule_addr     *src = NULL, *dst = NULL;
2574                 struct pf_addr_wrap     *xdst = NULL;
2575
2576                 if (r->action == PF_BINAT && direction == PF_IN) {
2577                         src = &r->dst;
2578                         if (r->rpool.cur != NULL)
2579                                 xdst = &r->rpool.cur->addr;
2580                 } else {
2581                         src = &r->src;
2582                         dst = &r->dst;
2583                 }
2584
2585                 r->evaluations++;
2586                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
2587                         r = r->skip[PF_SKIP_IFP].ptr;
2588                 else if (r->direction && r->direction != direction)
2589                         r = r->skip[PF_SKIP_DIR].ptr;
2590                 else if (r->af && r->af != pd->af)
2591                         r = r->skip[PF_SKIP_AF].ptr;
2592                 else if (r->proto && r->proto != pd->proto)
2593                         r = r->skip[PF_SKIP_PROTO].ptr;
2594                 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
2595                     src->neg, kif))
2596                         r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
2597                             PF_SKIP_DST_ADDR].ptr;
2598                 else if (src->port_op && !pf_match_port(src->port_op,
2599                     src->port[0], src->port[1], sport))
2600                         r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
2601                             PF_SKIP_DST_PORT].ptr;
2602                 else if (dst != NULL &&
2603                     PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL))
2604                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2605                 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
2606                     0, NULL))
2607                         r = TAILQ_NEXT(r, entries);
2608                 else if (dst != NULL && dst->port_op &&
2609                     !pf_match_port(dst->port_op, dst->port[0],
2610                     dst->port[1], dport))
2611                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2612                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
2613                         r = TAILQ_NEXT(r, entries);
2614                 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2615                     IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2616                     off, pd->hdr.tcp), r->os_fingerprint)))
2617                         r = TAILQ_NEXT(r, entries);
2618                 else {
2619                         if (r->tag)
2620                                 tag = r->tag;
2621                         if (r->rtableid >= 0)
2622                                 rtableid = r->rtableid;
2623                         if (r->anchor == NULL) {
2624                                 rm = r;
2625                         } else
2626                                 pf_step_into_anchor(&asd, &ruleset, rs_num,
2627                                     &r, NULL, NULL);
2628                 }
2629                 if (r == NULL)
2630                         pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r,
2631                             NULL, NULL);
2632         }
2633         if (pf_tag_packet(m, tag, rtableid))
2634                 return (NULL);
2635         if (rm != NULL && (rm->action == PF_NONAT ||
2636             rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2637                 return (NULL);
2638         return (rm);
2639 }
2640
2641 struct pf_rule *
2642 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2643     struct pfi_kif *kif, struct pf_src_node **sn,
2644     struct pf_state_key **skw, struct pf_state_key **sks,
2645     struct pf_state_key **skp, struct pf_state_key **nkp,
2646     struct pf_addr *saddr, struct pf_addr *daddr,
2647     u_int16_t sport, u_int16_t dport)
2648 {
2649         struct pf_rule  *r = NULL;
2650
2651
2652         if (direction == PF_OUT) {
2653                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2654                     sport, daddr, dport, PF_RULESET_BINAT);
2655                 if (r == NULL)
2656                         r = pf_match_translation(pd, m, off, direction, kif,
2657                             saddr, sport, daddr, dport, PF_RULESET_NAT);
2658         } else {
2659                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2660                     sport, daddr, dport, PF_RULESET_RDR);
2661                 if (r == NULL)
2662                         r = pf_match_translation(pd, m, off, direction, kif,
2663                             saddr, sport, daddr, dport, PF_RULESET_BINAT);
2664         }
2665
2666         if (r != NULL) {
2667                 struct pf_addr  *naddr;
2668                 u_int16_t       *nport;
2669
2670                 if (pf_state_key_setup(pd, r, skw, sks, skp, nkp,
2671                     saddr, daddr, sport, dport))
2672                         return r;
2673
2674                 /* XXX We only modify one side for now. */
2675                 naddr = &(*nkp)->addr[1];
2676                 nport = &(*nkp)->port[1];
2677
2678                 /*
2679                  * NOTE: Currently all translations will clear
2680                  *       BRIDGE_MBUF_TAGGED, telling the bridge to
2681                  *       ignore the original input encapsulation.
2682                  */
2683                 switch (r->action) {
2684                 case PF_NONAT:
2685                 case PF_NOBINAT:
2686                 case PF_NORDR:
2687                         return (NULL);
2688                 case PF_NAT:
2689                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2690                         if (pf_get_sport(pd->af, pd->proto, r, saddr,
2691                             daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2692                             r->rpool.proxy_port[1], sn)) {
2693                                 DPFPRINTF(PF_DEBUG_MISC,
2694                                     ("pf: NAT proxy port allocation "
2695                                     "(%u-%u) failed\n",
2696                                     r->rpool.proxy_port[0],
2697                                     r->rpool.proxy_port[1]));
2698                                 return (NULL);
2699                         }
2700                         break;
2701                 case PF_BINAT:
2702                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2703                         switch (direction) {
2704                         case PF_OUT:
2705                                 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
2706                                         switch (pd->af) {
2707 #ifdef INET
2708                                         case AF_INET:
2709                                                 if (r->rpool.cur->addr.p.dyn->
2710                                                     pfid_acnt4 < 1)
2711                                                         return (NULL);
2712                                                 PF_POOLMASK(naddr,
2713                                                     &r->rpool.cur->addr.p.dyn->
2714                                                     pfid_addr4,
2715                                                     &r->rpool.cur->addr.p.dyn->
2716                                                     pfid_mask4,
2717                                                     saddr, AF_INET);
2718                                                 break;
2719 #endif /* INET */
2720 #ifdef INET6
2721                                         case AF_INET6:
2722                                                 if (r->rpool.cur->addr.p.dyn->
2723                                                     pfid_acnt6 < 1)
2724                                                         return (NULL);
2725                                                 PF_POOLMASK(naddr,
2726                                                     &r->rpool.cur->addr.p.dyn->
2727                                                     pfid_addr6,
2728                                                     &r->rpool.cur->addr.p.dyn->
2729                                                     pfid_mask6,
2730                                                     saddr, AF_INET6);
2731                                                 break;
2732 #endif /* INET6 */
2733                                         }
2734                                 } else
2735                                         PF_POOLMASK(naddr,
2736                                             &r->rpool.cur->addr.v.a.addr,
2737                                             &r->rpool.cur->addr.v.a.mask,
2738                                             saddr, pd->af);
2739                                 break;
2740                         case PF_IN:
2741                                 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
2742                                         switch (pd->af) {
2743 #ifdef INET
2744                                         case AF_INET:
2745                                                 if (r->src.addr.p.dyn->
2746                                                     pfid_acnt4 < 1)
2747                                                         return (NULL);
2748                                                 PF_POOLMASK(naddr,
2749                                                     &r->src.addr.p.dyn->
2750                                                     pfid_addr4,
2751                                                     &r->src.addr.p.dyn->
2752                                                     pfid_mask4,
2753                                                     daddr, AF_INET);
2754                                                 break;
2755 #endif /* INET */
2756 #ifdef INET6
2757                                         case AF_INET6:
2758                                                 if (r->src.addr.p.dyn->
2759                                                     pfid_acnt6 < 1)
2760                                                         return (NULL);
2761                                                 PF_POOLMASK(naddr,
2762                                                     &r->src.addr.p.dyn->
2763                                                     pfid_addr6,
2764                                                     &r->src.addr.p.dyn->
2765                                                     pfid_mask6,
2766                                                     daddr, AF_INET6);
2767                                                 break;
2768 #endif /* INET6 */
2769                                         }
2770                                 } else
2771                                         PF_POOLMASK(naddr,
2772                                             &r->src.addr.v.a.addr,
2773                                             &r->src.addr.v.a.mask, daddr,
2774                                             pd->af);
2775                                 break;
2776                         }
2777                         break;
2778                 case PF_RDR: {
2779                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2780                         if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
2781                                 return (NULL);
2782                         if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
2783                             PF_POOL_BITMASK)
2784                                 PF_POOLMASK(naddr, naddr,
2785                                     &r->rpool.cur->addr.v.a.mask, daddr,
2786                                     pd->af);
2787
2788                         if (r->rpool.proxy_port[1]) {
2789                                 u_int32_t       tmp_nport;
2790
2791                                 tmp_nport = ((ntohs(dport) -
2792                                     ntohs(r->dst.port[0])) %
2793                                     (r->rpool.proxy_port[1] -
2794                                     r->rpool.proxy_port[0] + 1)) +
2795                                     r->rpool.proxy_port[0];
2796
2797                                 /* wrap around if necessary */
2798                                 if (tmp_nport > 65535)
2799                                         tmp_nport -= 65535;
2800                                 *nport = htons((u_int16_t)tmp_nport);
2801                         } else if (r->rpool.proxy_port[0])
2802                                 *nport = htons(r->rpool.proxy_port[0]);
2803                         break;
2804                 }
2805                 default:
2806                         return (NULL);
2807                 }
2808         }
2809
2810         return (r);
2811 }
2812
2813 #ifdef SMP
2814 struct netmsg_hashlookup {
2815         struct netmsg_base      base;
2816         struct inpcb            **nm_pinp;
2817         struct inpcbinfo        *nm_pcbinfo;
2818         struct pf_addr          *nm_saddr;
2819         struct pf_addr          *nm_daddr;
2820         uint16_t                nm_sport;
2821         uint16_t                nm_dport;
2822         sa_family_t             nm_af;
2823 };
2824
2825 #ifdef PF_SOCKET_LOOKUP_DOMSG
2826 static void
2827 in_pcblookup_hash_handler(netmsg_t msg)
2828 {
2829         struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg;
2830
2831         if (rmsg->nm_af == AF_INET)
2832                 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo,
2833                     rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4,
2834                     rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2835 #ifdef INET6
2836         else
2837                 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo,
2838                     &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6,
2839                     rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2840 #endif /* INET6 */
2841         lwkt_replymsg(&rmsg->base.lmsg, 0);
2842 }
2843 #endif  /* PF_SOCKET_LOOKUP_DOMSG */
2844
2845 #endif /* SMP */
2846
2847 int
2848 pf_socket_lookup(int direction, struct pf_pdesc *pd)
2849 {
2850         struct pf_addr          *saddr, *daddr;
2851         u_int16_t                sport, dport;
2852         struct inpcbinfo        *pi;
2853         struct inpcb            *inp;
2854 #ifdef SMP
2855         struct netmsg_hashlookup *msg = NULL;
2856 #ifdef PF_SOCKET_LOOKUP_DOMSG
2857         struct netmsg_hashlookup msg0;
2858 #endif
2859 #endif
2860         int                      pi_cpu = 0;
2861
2862         if (pd == NULL)
2863                 return (-1);
2864         pd->lookup.uid = UID_MAX;
2865         pd->lookup.gid = GID_MAX;
2866         pd->lookup.pid = NO_PID;
2867         if (direction == PF_IN) {
2868                 saddr = pd->src;
2869                 daddr = pd->dst;
2870         } else {
2871                 saddr = pd->dst;
2872                 daddr = pd->src;
2873         }
2874         switch (pd->proto) {
2875         case IPPROTO_TCP:
2876                 if (pd->hdr.tcp == NULL)
2877                         return (-1);
2878                 sport = pd->hdr.tcp->th_sport;
2879                 dport = pd->hdr.tcp->th_dport;
2880
2881                 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2882                 pi = &tcbinfo[pi_cpu];
2883 #ifdef SMP
2884                 /*
2885                  * Our netstack runs lockless on MP systems
2886                  * (only for TCP connections at the moment).
2887                  *
2888                  * As we are not allowed to read another CPU's tcbinfo,
2889                  * we have to ask that CPU via remote call to search the
2890                  * table for us.
2891                  *
2892                  * Prepare a msg iff data belongs to another CPU.
2893                  */
2894                 if (pi_cpu != mycpu->gd_cpuid) {
2895 #ifdef PF_SOCKET_LOOKUP_DOMSG
2896                         /*
2897                          * NOTE:
2898                          *
2899                          * Following lwkt_domsg() is dangerous and could
2900                          * lockup the network system, e.g.
2901                          *
2902                          * On 2 CPU system:
2903                          * netisr0 domsg to netisr1 (due to lookup)
2904                          * netisr1 domsg to netisr0 (due to lookup)
2905                          *
2906                          * We simply return -1 here, since we are probably
2907                          * called before NAT, so the TCP packet should
2908                          * already be on the correct CPU.
2909                          */
2910                         msg = &msg0;
2911                         netmsg_init(&msg->base, NULL, &curthread->td_msgport,
2912                                     0, in_pcblookup_hash_handler);
2913                         msg->nm_pinp = &inp;
2914                         msg->nm_pcbinfo = pi;
2915                         msg->nm_saddr = saddr;
2916                         msg->nm_sport = sport;
2917                         msg->nm_daddr = daddr;
2918                         msg->nm_dport = dport;
2919                         msg->nm_af = pd->af;
2920 #else   /* !PF_SOCKET_LOOKUP_DOMSG */
2921                         kprintf("pf_socket_lookup: tcp packet not on the "
2922                                 "correct cpu %d, cur cpu %d\n",
2923                                 pi_cpu, mycpuid);
2924                         print_backtrace(-1);
2925                         return -1;
2926 #endif  /* PF_SOCKET_LOOKUP_DOMSG */
2927                 }
2928 #endif /* SMP */
2929                 break;
2930         case IPPROTO_UDP:
2931                 if (pd->hdr.udp == NULL)
2932                         return (-1);
2933                 sport = pd->hdr.udp->uh_sport;
2934                 dport = pd->hdr.udp->uh_dport;
2935                 pi = &udbinfo;
2936                 break;
2937         default:
2938                 return (-1);
2939         }
2940         if (direction != PF_IN) {
2941                 u_int16_t       p;
2942
2943                 p = sport;
2944                 sport = dport;
2945                 dport = p;
2946         }
2947         switch (pd->af) {
2948 #ifdef INET6
2949         case AF_INET6:
2950 #ifdef SMP
2951                 /*
2952                  * Query other CPU, second part
2953                  *
2954                  * msg only gets initialized when:
2955                  * 1) packet is TCP
2956                  * 2) the info belongs to another CPU
2957                  *
2958                  * Use some switch/case magic to avoid code duplication.
2959                  */
2960                 if (msg == NULL)
2961 #endif /* SMP */
2962                 {
2963                         inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
2964                             &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
2965
2966                         if (inp == NULL)
2967                                 return (-1);
2968                         break;
2969                 }
2970                 /* FALLTHROUGH if SMP and on other CPU */
2971 #endif /* INET6 */
2972         case AF_INET:
2973 #ifdef SMP
2974                 if (msg != NULL) {
2975                         lwkt_domsg(cpu_portfn(pi_cpu),
2976                                      &msg->base.lmsg, 0);
2977                 } else
2978 #endif /* SMP */
2979                 {
2980                         inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2981                             dport, INPLOOKUP_WILDCARD, NULL);
2982                 }
2983                 if (inp == NULL)
2984                         return (-1);
2985                 break;
2986
2987         default:
2988                 return (-1);
2989         }
2990         pd->lookup.uid = inp->inp_socket->so_cred->cr_uid;
2991         pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0];
2992         return (1);
2993 }
2994
2995 u_int8_t
2996 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2997 {
2998         int              hlen;
2999         u_int8_t         hdr[60];
3000         u_int8_t        *opt, optlen;
3001         u_int8_t         wscale = 0;
3002
3003         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
3004         if (hlen <= sizeof(struct tcphdr))
3005                 return (0);
3006         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3007                 return (0);
3008         opt = hdr + sizeof(struct tcphdr);
3009         hlen -= sizeof(struct tcphdr);
3010         while (hlen >= 3) {
3011                 switch (*opt) {
3012                 case TCPOPT_EOL:
3013                 case TCPOPT_NOP:
3014                         ++opt;
3015                         --hlen;
3016                         break;
3017                 case TCPOPT_WINDOW:
3018                         wscale = opt[2];
3019                         if (wscale > TCP_MAX_WINSHIFT)
3020                                 wscale = TCP_MAX_WINSHIFT;
3021                         wscale |= PF_WSCALE_FLAG;
3022                         /* FALLTHROUGH */
3023                 default:
3024                         optlen = opt[1];
3025                         if (optlen < 2)
3026                                 optlen = 2;
3027                         hlen -= optlen;
3028                         opt += optlen;
3029                         break;
3030                 }
3031         }
3032         return (wscale);
3033 }
3034
3035 u_int16_t
3036 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3037 {
3038         int              hlen;
3039         u_int8_t         hdr[60];
3040         u_int8_t        *opt, optlen;
3041         u_int16_t        mss = tcp_mssdflt;
3042
3043         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
3044         if (hlen <= sizeof(struct tcphdr))
3045                 return (0);
3046         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3047                 return (0);
3048         opt = hdr + sizeof(struct tcphdr);
3049         hlen -= sizeof(struct tcphdr);
3050         while (hlen >= TCPOLEN_MAXSEG) {
3051                 switch (*opt) {
3052                 case TCPOPT_EOL:
3053                 case TCPOPT_NOP:
3054                         ++opt;
3055                         --hlen;
3056                         break;
3057                 case TCPOPT_MAXSEG:
3058                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3059                         /* FALLTHROUGH */
3060                 default:
3061                         optlen = opt[1];
3062                         if (optlen < 2)
3063                                 optlen = 2;
3064                         hlen -= optlen;
3065                         opt += optlen;
3066                         break;
3067                 }
3068         }
3069         return (mss);
3070 }
3071
3072 u_int16_t
3073 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
3074 {
3075 #ifdef INET
3076         struct sockaddr_in      *dst;
3077         struct route             ro;
3078 #endif /* INET */
3079 #ifdef INET6
3080         struct sockaddr_in6     *dst6;
3081         struct route_in6         ro6;
3082 #endif /* INET6 */
3083         struct rtentry          *rt = NULL;
3084         int                      hlen = 0;
3085         u_int16_t                mss = tcp_mssdflt;
3086
3087         switch (af) {
3088 #ifdef INET
3089         case AF_INET:
3090                 hlen = sizeof(struct ip);
3091                 bzero(&ro, sizeof(ro));
3092                 dst = (struct sockaddr_in *)&ro.ro_dst;
3093                 dst->sin_family = AF_INET;
3094                 dst->sin_len = sizeof(*dst);
3095                 dst->sin_addr = addr->v4;
3096                 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
3097                 rt = ro.ro_rt;
3098                 break;
3099 #endif /* INET */
3100 #ifdef INET6
3101         case AF_INET6:
3102                 hlen = sizeof(struct ip6_hdr);
3103                 bzero(&ro6, sizeof(ro6));
3104                 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
3105                 dst6->sin6_family = AF_INET6;
3106                 dst6->sin6_len = sizeof(*dst6);
3107                 dst6->sin6_addr = addr->v6;
3108                 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
3109                 rt = ro6.ro_rt;
3110                 break;
3111 #endif /* INET6 */
3112         }
3113
3114         if (rt && rt->rt_ifp) {
3115                 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
3116                 mss = max(tcp_mssdflt, mss);
3117                 RTFREE(rt);
3118         }
3119         mss = min(mss, offer);
3120         mss = max(mss, 64);             /* sanity - at least max opt space */
3121         return (mss);
3122 }
3123
3124 void
3125 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
3126 {
3127         struct pf_rule *r = s->rule.ptr;
3128
3129         s->rt_kif = NULL;
3130         if (!r->rt || r->rt == PF_FASTROUTE)
3131                 return;
3132         switch (s->key[PF_SK_WIRE]->af) {
3133 #ifdef INET
3134         case AF_INET:
3135                 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
3136                     &s->nat_src_node);
3137                 s->rt_kif = r->rpool.cur->kif;
3138                 break;
3139 #endif /* INET */
3140 #ifdef INET6
3141         case AF_INET6:
3142                 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
3143                     &s->nat_src_node);
3144                 s->rt_kif = r->rpool.cur->kif;
3145                 break;
3146 #endif /* INET6 */
3147         }
3148 }
3149
3150 u_int32_t
3151 pf_tcp_iss(struct pf_pdesc *pd)
3152 {
3153         MD5_CTX ctx;
3154         u_int32_t digest[4];
3155
3156         if (pf_tcp_secret_init == 0) {
3157                 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret));
3158                 MD5Init(&pf_tcp_secret_ctx);
3159                 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret,
3160                     sizeof(pf_tcp_secret));
3161                 pf_tcp_secret_init = 1;
3162         }
3163         ctx = pf_tcp_secret_ctx;
3164
3165         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3166         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3167         if (pd->af == AF_INET6) {
3168                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3169                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3170         } else {
3171                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3172                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3173         }
3174         MD5Final((u_char *)digest, &ctx);
3175         pf_tcp_iss_off += 4096;
3176         return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off);
3177 }
3178
3179 int
3180 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3181     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3182     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
3183     struct ifqueue *ifq, struct inpcb *inp)
3184 {
3185         struct pf_rule          *nr = NULL;
3186         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3187         sa_family_t              af = pd->af;
3188         struct pf_rule          *r, *a = NULL;
3189         struct pf_ruleset       *ruleset = NULL;
3190         struct pf_src_node      *nsn = NULL;
3191         struct tcphdr           *th = pd->hdr.tcp;
3192         struct pf_state_key     *skw = NULL, *sks = NULL;
3193         struct pf_state_key     *sk = NULL, *nk = NULL;
3194         u_short                  reason;
3195         int                      rewrite = 0, hdrlen = 0;
3196         int                      tag = -1, rtableid = -1;
3197         int                      asd = 0;
3198         int                      match = 0;
3199         int                      state_icmp = 0;
3200         u_int16_t                sport = 0, dport = 0;
3201         u_int16_t                nport = 0, bport = 0;
3202         u_int16_t                bproto_sum = 0, bip_sum = 0;
3203         u_int8_t                 icmptype = 0, icmpcode = 0;
3204
3205
3206         if (direction == PF_IN && pf_check_congestion(ifq)) {
3207                 REASON_SET(&reason, PFRES_CONGEST);
3208                 return (PF_DROP);
3209         }
3210
3211         if (inp != NULL)
3212                 pd->lookup.done = pf_socket_lookup(direction, pd);
3213         else if (debug_pfugidhack) {
3214                 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n"));
3215                 pd->lookup.done = pf_socket_lookup(direction, pd);
3216         }
3217
3218         switch (pd->proto) {
3219         case IPPROTO_TCP:
3220                 sport = th->th_sport;
3221                 dport = th->th_dport;
3222                 hdrlen = sizeof(*th);
3223                 break;
3224         case IPPROTO_UDP:
3225                 sport = pd->hdr.udp->uh_sport;
3226                 dport = pd->hdr.udp->uh_dport;
3227                 hdrlen = sizeof(*pd->hdr.udp);
3228                 break;
3229 #ifdef INET
3230         case IPPROTO_ICMP:
3231                 if (pd->af != AF_INET)
3232                         break;
3233                 sport = dport = pd->hdr.icmp->icmp_id;
3234                 hdrlen = sizeof(*pd->hdr.icmp);
3235                 icmptype = pd->hdr.icmp->icmp_type;
3236                 icmpcode = pd->hdr.icmp->icmp_code;
3237
3238                 if (icmptype == ICMP_UNREACH ||
3239                     icmptype == ICMP_SOURCEQUENCH ||
3240                     icmptype == ICMP_REDIRECT ||
3241                     icmptype == ICMP_TIMXCEED ||
3242                     icmptype == ICMP_PARAMPROB)
3243                         state_icmp++;
3244                 break;
3245 #endif /* INET */
3246 #ifdef INET6
3247         case IPPROTO_ICMPV6:
3248                 if (af != AF_INET6)
3249                         break;
3250                 sport = dport = pd->hdr.icmp6->icmp6_id;
3251                 hdrlen = sizeof(*pd->hdr.icmp6);
3252                 icmptype = pd->hdr.icmp6->icmp6_type;
3253                 icmpcode = pd->hdr.icmp6->icmp6_code;
3254
3255                 if (icmptype == ICMP6_DST_UNREACH ||
3256                     icmptype == ICMP6_PACKET_TOO_BIG ||
3257                     icmptype == ICMP6_TIME_EXCEEDED ||
3258                     icmptype == ICMP6_PARAM_PROB)
3259                         state_icmp++;
3260                 break;
3261 #endif /* INET6 */
3262         default:
3263                 sport = dport = hdrlen = 0;
3264                 break;
3265         }
3266
3267         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3268
3269         bport = nport = sport;
3270         /* check packet for BINAT/NAT/RDR */
3271         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn,
3272             &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) {
3273                 if (nk == NULL || sk == NULL) {
3274                         REASON_SET(&reason, PFRES_MEMORY);
3275                         goto cleanup;
3276                 }
3277
3278                 if (pd->ip_sum)
3279                         bip_sum = *pd->ip_sum;
3280
3281                 switch (pd->proto) {
3282                 case IPPROTO_TCP:
3283                         bproto_sum = th->th_sum;
3284                         pd->proto_sum = &th->th_sum;
3285
3286                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3287                             nk->port[pd->sidx] != sport) {
3288                                 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
3289                                     &th->th_sum, &nk->addr[pd->sidx],
3290                                     nk->port[pd->sidx], 0, af);
3291                                 pd->sport = &th->th_sport;
3292                                 sport = th->th_sport;
3293                         }
3294
3295                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3296                             nk->port[pd->didx] != dport) {
3297                                 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
3298                                     &th->th_sum, &nk->addr[pd->didx],
3299                                     nk->port[pd->didx], 0, af);
3300                                 dport = th->th_dport;
3301                                 pd->dport = &th->th_dport;
3302                         }
3303                         rewrite++;
3304                         break;
3305                 case IPPROTO_UDP:
3306                         bproto_sum = pd->hdr.udp->uh_sum;
3307                         pd->proto_sum = &pd->hdr.udp->uh_sum;
3308
3309                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3310                             nk->port[pd->sidx] != sport) {
3311                                 pf_change_ap(saddr, &pd->hdr.udp->uh_sport,
3312                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3313                                     &nk->addr[pd->sidx],
3314                                     nk->port[pd->sidx], 1, af);
3315                                 sport = pd->hdr.udp->uh_sport;
3316                                 pd->sport = &pd->hdr.udp->uh_sport;
3317                         }
3318
3319                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3320                             nk->port[pd->didx] != dport) {
3321                                 pf_change_ap(daddr, &pd->hdr.udp->uh_dport,
3322                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3323                                     &nk->addr[pd->didx],
3324                                     nk->port[pd->didx], 1, af);
3325                                 dport = pd->hdr.udp->uh_dport;
3326                                 pd->dport = &pd->hdr.udp->uh_dport;
3327                         }
3328                         rewrite++;
3329                         break;
3330 #ifdef INET
3331                 case IPPROTO_ICMP:
3332                         nk->port[0] = nk->port[1];
3333                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3334                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3335                                     nk->addr[pd->sidx].v4.s_addr, 0);
3336
3337                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3338                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3339                                     nk->addr[pd->didx].v4.s_addr, 0);
3340
3341                         if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3342                                 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3343                                     pd->hdr.icmp->icmp_cksum, sport,
3344                                     nk->port[1], 0);
3345                                 pd->hdr.icmp->icmp_id = nk->port[1];
3346                                 pd->sport = &pd->hdr.icmp->icmp_id;
3347                         }
3348                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3349                         break;
3350 #endif /* INET */
3351 #ifdef INET6
3352                 case IPPROTO_ICMPV6:
3353                         nk->port[0] = nk->port[1];
3354                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3355                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3356                                     &nk->addr[pd->sidx], 0);
3357
3358                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3359                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3360                                     &nk->addr[pd->didx], 0);
3361                         rewrite++;
3362                         break;
3363 #endif /* INET */
3364                 default:
3365                         switch (af) {
3366 #ifdef INET
3367                         case AF_INET:
3368                                 if (PF_ANEQ(saddr,
3369                                     &nk->addr[pd->sidx], AF_INET))
3370                                         pf_change_a(&saddr->v4.s_addr,
3371                                             pd->ip_sum,
3372                                             nk->addr[pd->sidx].v4.s_addr, 0);
3373
3374                                 if (PF_ANEQ(daddr,
3375                                     &nk->addr[pd->didx], AF_INET))
3376                                         pf_change_a(&daddr->v4.s_addr,
3377                                             pd->ip_sum,
3378                                             nk->addr[pd->didx].v4.s_addr, 0);
3379                                 break;
3380 #endif /* INET */
3381 #ifdef INET6
3382                         case AF_INET6:
3383                                 if (PF_ANEQ(saddr,
3384                                     &nk->addr[pd->sidx], AF_INET6))
3385                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3386
3387                                 if (PF_ANEQ(daddr,
3388                                     &nk->addr[pd->didx], AF_INET6))
3389                                         PF_ACPY(saddr, &nk->addr[pd->didx], af);
3390                                 break;
3391 #endif /* INET */
3392                         }
3393                         break;
3394                 }
3395                 if (nr->natpass)
3396                         r = NULL;
3397                 pd->nat_rule = nr;
3398         }
3399
3400         while (r != NULL) {
3401                 r->evaluations++;
3402                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3403                         r = r->skip[PF_SKIP_IFP].ptr;
3404                 else if (r->direction && r->direction != direction)
3405                         r = r->skip[PF_SKIP_DIR].ptr;
3406                 else if (r->af && r->af != af)
3407                         r = r->skip[PF_SKIP_AF].ptr;
3408                 else if (r->proto && r->proto != pd->proto)
3409                         r = r->skip[PF_SKIP_PROTO].ptr;
3410                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3411                     r->src.neg, kif))
3412                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3413                 /* tcp/udp only. port_op always 0 in other cases */
3414                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3415                     r->src.port[0], r->src.port[1], sport))
3416                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
3417                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3418                     r->dst.neg, NULL))
3419                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3420                 /* tcp/udp only. port_op always 0 in other cases */
3421                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3422                     r->dst.port[0], r->dst.port[1], dport))
3423                         r = r->skip[PF_SKIP_DST_PORT].ptr;
3424                 /* icmp only. type always 0 in other cases */
3425                 else if (r->type && r->type != icmptype + 1)
3426                         r = TAILQ_NEXT(r, entries);
3427                 /* icmp only. type always 0 in other cases */
3428                 else if (r->code && r->code != icmpcode + 1)
3429                         r = TAILQ_NEXT(r, entries);
3430                 else if (r->tos && !(r->tos == pd->tos))
3431                         r = TAILQ_NEXT(r, entries);
3432                 else if (r->rule_flag & PFRULE_FRAGMENT)
3433                         r = TAILQ_NEXT(r, entries);
3434                 else if (pd->proto == IPPROTO_TCP &&
3435                     (r->flagset & th->th_flags) != r->flags)
3436                         r = TAILQ_NEXT(r, entries);
3437                 /* tcp/udp only. uid.op always 0 in other cases */
3438                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3439                     pf_socket_lookup(direction, pd), 1)) &&
3440                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3441                     pd->lookup.uid))
3442                         r = TAILQ_NEXT(r, entries);
3443                 /* tcp/udp only. gid.op always 0 in other cases */
3444                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3445                     pf_socket_lookup(direction, pd), 1)) &&
3446                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3447                     pd->lookup.gid))
3448                         r = TAILQ_NEXT(r, entries);
3449                 else if (r->prob &&
3450                   r->prob <= karc4random())
3451                         r = TAILQ_NEXT(r, entries);
3452                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3453                         r = TAILQ_NEXT(r, entries);
3454                 else if (r->os_fingerprint != PF_OSFP_ANY &&
3455                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3456                     pf_osfp_fingerprint(pd, m, off, th),
3457                     r->os_fingerprint)))
3458                         r = TAILQ_NEXT(r, entries);
3459                 else {
3460                         if (r->tag)
3461                                 tag = r->tag;
3462                         if (r->rtableid >= 0)
3463                                 rtableid = r->rtableid;
3464                         if (r->anchor == NULL) {
3465                                 match = 1;
3466                                 *rm = r;
3467                                 *am = a;
3468                                 *rsm = ruleset;
3469                                 if ((*rm)->quick)
3470                                         break;
3471                                 r = TAILQ_NEXT(r, entries);
3472                         } else
3473                                 pf_step_into_anchor(&asd, &ruleset,
3474                                     PF_RULESET_FILTER, &r, &a, &match);
3475                 }
3476                 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3477                     PF_RULESET_FILTER, &r, &a, &match))
3478                         break;
3479         }
3480         r = *rm;
3481         a = *am;
3482         ruleset = *rsm;
3483
3484         REASON_SET(&reason, PFRES_MATCH);
3485
3486         if (r->log || (nr != NULL && nr->log)) {
3487                 if (rewrite)
3488                         m_copyback(m, off, hdrlen, pd->hdr.any);
3489                 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
3490                     a, ruleset, pd);
3491         }
3492
3493         if ((r->action == PF_DROP) &&
3494             ((r->rule_flag & PFRULE_RETURNRST) ||
3495             (r->rule_flag & PFRULE_RETURNICMP) ||
3496             (r->rule_flag & PFRULE_RETURN))) {
3497                 /* undo NAT changes, if they have taken place */
3498                 if (nr != NULL) {
3499                         PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3500                         PF_ACPY(daddr, &sk->addr[pd->didx], af);
3501                         if (pd->sport)
3502                                 *pd->sport = sk->port[pd->sidx];
3503                         if (pd->dport)
3504                                 *pd->dport = sk->port[pd->didx];
3505                         if (pd->proto_sum)
3506                                 *pd->proto_sum = bproto_sum;
3507                         if (pd->ip_sum)
3508                                 *pd->ip_sum = bip_sum;
3509                         m_copyback(m, off, hdrlen, pd->hdr.any);
3510                 }
3511                 if (pd->proto == IPPROTO_TCP &&
3512                     ((r->rule_flag & PFRULE_RETURNRST) ||
3513                     (r->rule_flag & PFRULE_RETURN)) &&
3514                     !(th->th_flags & TH_RST)) {
3515                         u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
3516                         int              len = 0;
3517                         struct ip       *h4;
3518                         struct ip6_hdr  *h6;
3519
3520                         switch (af) {
3521                         case AF_INET:
3522                                 h4 = mtod(m, struct ip *);
3523                                 len = h4->ip_len - off;
3524                                 break;
3525 #ifdef INET6
3526                         case AF_INET6:
3527                                 h6 = mtod(m, struct ip6_hdr *);
3528                                 len = h6->ip6_plen - (off - sizeof(*h6));
3529                                 break;
3530 #endif
3531                         }
3532
3533                         if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3534                                 REASON_SET(&reason, PFRES_PROTCKSUM);
3535                         else {
3536                                 if (th->th_flags & TH_SYN)
3537                                         ack++;
3538                                 if (th->th_flags & TH_FIN)
3539                                         ack++;
3540                                 pf_send_tcp(r, af, pd->dst,
3541                                     pd->src, th->th_dport, th->th_sport,
3542                                     ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3543                                     r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
3544                         }
3545                 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3546                     r->return_icmp)
3547                         pf_send_icmp(m, r->return_icmp >> 8,
3548                             r->return_icmp & 255, af, r);
3549                 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3550                     r->return_icmp6)
3551                         pf_send_icmp(m, r->return_icmp6 >> 8,
3552                             r->return_icmp6 & 255, af, r);
3553         }
3554
3555         if (r->action == PF_DROP)
3556                 goto cleanup;
3557
3558         if (pf_tag_packet(m, tag, rtableid)) {
3559                 REASON_SET(&reason, PFRES_MEMORY);
3560                 goto cleanup;
3561         }
3562
3563         if (!state_icmp && (r->keep_state || nr != NULL ||
3564             (pd->flags & PFDESC_TCP_NORM))) {
3565                 int action;
3566                 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m,
3567                     off, sport, dport, &rewrite, kif, sm, tag, bproto_sum,
3568                     bip_sum, hdrlen);
3569                 if (action != PF_PASS)
3570                         return (action);
3571         }
3572
3573         /* copy back packet headers if we performed NAT operations */
3574         if (rewrite)
3575                 m_copyback(m, off, hdrlen, pd->hdr.any);
3576
3577         return (PF_PASS);
3578
3579 cleanup:
3580         if (sk != NULL)
3581                 pool_put(&pf_state_key_pl, sk);
3582         if (nk != NULL)
3583                 pool_put(&pf_state_key_pl, nk);
3584         return (PF_DROP);
3585 }
3586
3587 static __inline int
3588 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3589     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw,
3590     struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk,
3591     struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite,
3592     struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum,
3593     u_int16_t bip_sum, int hdrlen)
3594 {
3595         struct pf_state         *s = NULL;
3596         struct pf_src_node      *sn = NULL;
3597         struct tcphdr           *th = pd->hdr.tcp;
3598         u_int16_t                mss = tcp_mssdflt;
3599         u_short                  reason;
3600
3601         /* check maximums */
3602         if (r->max_states && (r->states_cur >= r->max_states)) {
3603                 pf_status.lcounters[LCNT_STATES]++;
3604                 REASON_SET(&reason, PFRES_MAXSTATES);
3605                 return (PF_DROP);
3606         }
3607         /* src node for filter rule */
3608         if ((r->rule_flag & PFRULE_SRCTRACK ||
3609             r->rpool.opts & PF_POOL_STICKYADDR) &&
3610             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3611                 REASON_SET(&reason, PFRES_SRCLIMIT);
3612                 goto csfailed;
3613         }
3614         /* src node for translation rule */
3615         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3616             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3617                 REASON_SET(&reason, PFRES_SRCLIMIT);
3618                 goto csfailed;
3619         }
3620         s = pool_get(&pf_state_pl, PR_NOWAIT | PR_ZERO);
3621         if (s == NULL) {
3622                 REASON_SET(&reason, PFRES_MEMORY);
3623                 goto csfailed;
3624         }
3625         s->id = 0; /* XXX Do we really need that? not in OpenBSD */
3626         s->creatorid = 0;
3627         s->rule.ptr = r;
3628         s->nat_rule.ptr = nr;
3629         s->anchor.ptr = a;
3630         STATE_INC_COUNTERS(s);
3631         if (r->allow_opts)
3632                 s->state_flags |= PFSTATE_ALLOWOPTS;
3633         if (r->rule_flag & PFRULE_STATESLOPPY)
3634                 s->state_flags |= PFSTATE_SLOPPY;
3635         s->log = r->log & PF_LOG_ALL;
3636         if (nr != NULL)
3637                 s->log |= nr->log & PF_LOG_ALL;
3638         switch (pd->proto) {
3639         case IPPROTO_TCP:
3640                 s->src.seqlo = ntohl(th->th_seq);
3641                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3642                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3643                     r->keep_state == PF_STATE_MODULATE) {
3644                         /* Generate sequence number modulator */
3645                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3646                             0)
3647                                 s->src.seqdiff = 1;
3648                         pf_change_a(&th->th_seq, &th->th_sum,
3649                             htonl(s->src.seqlo + s->src.seqdiff), 0);
3650                         *rewrite = 1;
3651                 } else
3652                         s->src.seqdiff = 0;
3653                 if (th->th_flags & TH_SYN) {
3654                         s->src.seqhi++;
3655                         s->src.wscale = pf_get_wscale(m, off,
3656                             th->th_off, pd->af);
3657                 }
3658                 s->src.max_win = MAX(ntohs(th->th_win), 1);
3659                 if (s->src.wscale & PF_WSCALE_MASK) {
3660                         /* Remove scale factor from initial window */
3661                         int win = s->src.max_win;
3662                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3663                         s->src.max_win = (win - 1) >>
3664                             (s->src.wscale & PF_WSCALE_MASK);
3665                 }
3666                 if (th->th_flags & TH_FIN)
3667                         s->src.seqhi++;
3668                 s->dst.seqhi = 1;
3669                 s->dst.max_win = 1;
3670                 s->src.state = TCPS_SYN_SENT;
3671                 s->dst.state = TCPS_CLOSED;
3672                 s->timeout = PFTM_TCP_FIRST_PACKET;
3673                 break;
3674         case IPPROTO_UDP:
3675                 s->src.state = PFUDPS_SINGLE;
3676                 s->dst.state = PFUDPS_NO_TRAFFIC;
3677                 s->timeout = PFTM_UDP_FIRST_PACKET;
3678                 break;
3679         case IPPROTO_ICMP:
3680 #ifdef INET6
3681         case IPPROTO_ICMPV6:
3682 #endif
3683                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3684                 break;
3685         default:
3686                 s->src.state = PFOTHERS_SINGLE;
3687                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3688                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3689         }
3690
3691         s->creation = time_second;
3692         s->expire = time_second;
3693
3694         if (sn != NULL) {
3695                 s->src_node = sn;
3696                 s->src_node->states++;
3697         }
3698         if (nsn != NULL) {
3699                 /* XXX We only modify one side for now. */
3700                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3701                 s->nat_src_node = nsn;
3702                 s->nat_src_node->states++;
3703         }
3704         if (pd->proto == IPPROTO_TCP) {
3705                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3706                     off, pd, th, &s->src, &s->dst)) {
3707                         REASON_SET(&reason, PFRES_MEMORY);
3708                         pf_src_tree_remove_state(s);
3709                         STATE_DEC_COUNTERS(s);
3710                         pool_put(&pf_state_pl, s);
3711                         return (PF_DROP);
3712                 }
3713                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3714                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3715                     &s->src, &s->dst, rewrite)) {
3716                         /* This really shouldn't happen!!! */
3717                         DPFPRINTF(PF_DEBUG_URGENT,
3718                             ("pf_normalize_tcp_stateful failed on first pkt"));
3719                         pf_normalize_tcp_cleanup(s);
3720                         pf_src_tree_remove_state(s);
3721                         STATE_DEC_COUNTERS(s);
3722                         pool_put(&pf_state_pl, s);
3723                         return (PF_DROP);
3724                 }
3725         }
3726         s->direction = pd->dir;
3727
3728         if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk,
3729             pd->src, pd->dst, sport, dport))
3730                 goto csfailed;
3731
3732         if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) {
3733                 if (pd->proto == IPPROTO_TCP)
3734                         pf_normalize_tcp_cleanup(s);
3735                 REASON_SET(&reason, PFRES_STATEINS);
3736                 pf_src_tree_remove_state(s);
3737                 STATE_DEC_COUNTERS(s);
3738                 pool_put(&pf_state_pl, s);
3739                 return (PF_DROP);
3740         } else
3741                 *sm = s;
3742
3743         pf_set_rt_ifp(s, pd->src);      /* needs s->state_key set */
3744         if (tag > 0) {
3745                 pf_tag_ref(tag);
3746                 s->tag = tag;
3747         }
3748         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3749             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3750                 s->src.state = PF_TCPS_PROXY_SRC;
3751                 /* undo NAT changes, if they have taken place */
3752                 if (nr != NULL) {
3753                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
3754                         if (pd->dir == PF_OUT)
3755                                 skt = s->key[PF_SK_STACK];
3756                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3757                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3758                         if (pd->sport)
3759                                 *pd->sport = skt->port[pd->sidx];
3760                         if (pd->dport)
3761                                 *pd->dport = skt->port[pd->didx];
3762                         if (pd->proto_sum)
3763                                 *pd->proto_sum = bproto_sum;
3764                         if (pd->ip_sum)
3765                                 *pd->ip_sum = bip_sum;
3766                         m_copyback(m, off, hdrlen, pd->hdr.any);
3767                 }
3768                 s->src.seqhi = htonl(karc4random());
3769                 /* Find mss option */
3770                 mss = pf_get_mss(m, off, th->th_off, pd->af);
3771                 mss = pf_calc_mss(pd->src, pd->af, mss);
3772                 mss = pf_calc_mss(pd->dst, pd->af, mss);
3773                 s->src.mss = mss;
3774                 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport,
3775                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3776                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
3777                 REASON_SET(&reason, PFRES_SYNPROXY);
3778                 return (PF_SYNPROXY_DROP);
3779         }
3780
3781         return (PF_PASS);
3782
3783 csfailed:
3784         if (sk != NULL)
3785                 pool_put(&pf_state_key_pl, sk);
3786         if (nk != NULL)
3787                 pool_put(&pf_state_key_pl, nk);
3788
3789         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3790                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3791                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3792                 pf_status.src_nodes--;
3793                 pool_put(&pf_src_tree_pl, sn);
3794         }
3795         if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) {
3796                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3797                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3798                 pf_status.src_nodes--;
3799                 pool_put(&pf_src_tree_pl, nsn);
3800         }
3801         return (PF_DROP);
3802 }
3803
3804 int
3805 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3806     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3807     struct pf_ruleset **rsm)
3808 {
3809         struct pf_rule          *r, *a = NULL;
3810         struct pf_ruleset       *ruleset = NULL;
3811         sa_family_t              af = pd->af;
3812         u_short                  reason;
3813         int                      tag = -1;
3814         int                      asd = 0;
3815         int                      match = 0;
3816
3817         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3818         while (r != NULL) {
3819                 r->evaluations++;
3820                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3821                         r = r->skip[PF_SKIP_IFP].ptr;
3822                 else if (r->direction && r->direction != direction)
3823                         r = r->skip[PF_SKIP_DIR].ptr;
3824                 else if (r->af && r->af != af)
3825                         r = r->skip[PF_SKIP_AF].ptr;
3826                 else if (r->proto && r->proto != pd->proto)
3827                         r = r->skip[PF_SKIP_PROTO].ptr;
3828                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3829                     r->src.neg, kif))
3830                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3831                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3832                     r->dst.neg, NULL))
3833                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3834                 else if (r->tos && !(r->tos == pd->tos))
3835                         r = TAILQ_NEXT(r, entries);
3836                 else if (r->os_fingerprint != PF_OSFP_ANY)
3837                         r = TAILQ_NEXT(r, entries);
3838                 else if (pd->proto == IPPROTO_UDP &&
3839                     (r->src.port_op || r->dst.port_op))
3840                         r = TAILQ_NEXT(r, entries);
3841                 else if (pd->proto == IPPROTO_TCP &&
3842                     (r->src.port_op || r->dst.port_op || r->flagset))
3843                         r = TAILQ_NEXT(r, entries);
3844                 else if ((pd->proto == IPPROTO_ICMP ||
3845                     pd->proto == IPPROTO_ICMPV6) &&
3846                     (r->type || r->code))
3847                         r = TAILQ_NEXT(r, entries);
3848                 else if (r->prob && r->prob <= karc4random())
3849                         r = TAILQ_NEXT(r, entries);
3850                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3851                         r = TAILQ_NEXT(r, entries);
3852                 else {
3853                         if (r->anchor == NULL) {
3854                                 match = 1;
3855                                 *rm = r;
3856                                 *am = a;
3857                                 *rsm = ruleset;
3858                                 if ((*rm)->quick)
3859                                         break;
3860                                 r = TAILQ_NEXT(r, entries);
3861                         } else
3862                                 pf_step_into_anchor(&asd, &ruleset,
3863                                     PF_RULESET_FILTER, &r, &a, &match);
3864                 }
3865                 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3866                     PF_RULESET_FILTER, &r, &a, &match))
3867                         break;
3868         }
3869         r = *rm;
3870         a = *am;
3871         ruleset = *rsm;
3872
3873         REASON_SET(&reason, PFRES_MATCH);
3874
3875         if (r->log)
3876                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
3877                     pd);
3878
3879         if (r->action != PF_PASS)
3880                 return (PF_DROP);
3881
3882         if (pf_tag_packet(m, tag, -1)) {
3883                 REASON_SET(&reason, PFRES_MEMORY);
3884                 return (PF_DROP);
3885         }
3886
3887         return (PF_PASS);
3888 }
3889
3890 int
3891 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3892         struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3893         struct pf_pdesc *pd, u_short *reason, int *copyback)
3894 {
3895         struct tcphdr           *th = pd->hdr.tcp;
3896         u_int16_t                win = ntohs(th->th_win);
3897         u_int32_t                ack, end, seq, orig_seq;
3898         u_int8_t                 sws, dws;
3899         int                      ackskew;
3900
3901         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3902                 sws = src->wscale & PF_WSCALE_MASK;
3903                 dws = dst->wscale & PF_WSCALE_MASK;
3904         } else
3905                 sws = dws = 0;
3906
3907         /*
3908          * Sequence tracking algorithm from Guido van Rooij's paper:
3909          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3910          *      tcp_filtering.ps
3911          */
3912
3913         orig_seq = seq = ntohl(th->th_seq);
3914         if (src->seqlo == 0) {
3915                 /* First packet from this end. Set its state */
3916
3917                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3918                     src->scrub == NULL) {
3919                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3920                                 REASON_SET(reason, PFRES_MEMORY);
3921                                 return (PF_DROP);
3922                         }
3923                 }
3924
3925                 /* Deferred generation of sequence number modulator */
3926                 if (dst->seqdiff && !src->seqdiff) {
3927                         /* use random iss for the TCP server */
3928                         while ((src->seqdiff = karc4random() - seq) == 0)
3929                                 ;
3930                         ack = ntohl(th->th_ack) - dst->seqdiff;
3931                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3932                             src->seqdiff), 0);
3933                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3934                         *copyback = 1;
3935                 } else {
3936                         ack = ntohl(th->th_ack);
3937                 }
3938
3939                 end = seq + pd->p_len;
3940                 if (th->th_flags & TH_SYN) {
3941                         end++;
3942                         (*state)->sync_flags |= PFSTATE_GOT_SYN2;
3943                         if (dst->wscale & PF_WSCALE_FLAG) {
3944                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3945                                     pd->af);
3946                                 if (src->wscale & PF_WSCALE_FLAG) {
3947                                         /* Remove scale factor from initial
3948                                          * window */
3949                                         sws = src->wscale & PF_WSCALE_MASK;
3950                                         win = ((u_int32_t)win + (1 << sws) - 1)
3951                                             >> sws;
3952                                         dws = dst->wscale & PF_WSCALE_MASK;
3953                                 } else {
3954                                         /* fixup other window */
3955                                         dst->max_win <<= dst->wscale &
3956                                             PF_WSCALE_MASK;
3957                                         /* in case of a retrans SYN|ACK */
3958                                         dst->wscale = 0;
3959                                 }
3960                         }
3961                 }
3962                 if (th->th_flags & TH_FIN)
3963                         end++;
3964
3965                 src->seqlo = seq;
3966                 if (src->state < TCPS_SYN_SENT)
3967                         src->state = TCPS_SYN_SENT;
3968
3969                 /*
3970                  * May need to slide the window (seqhi may have been set by
3971                  * the crappy stack check or if we picked up the connection
3972                  * after establishment)
3973                  */
3974                 if (src->seqhi == 1 ||
3975                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3976                         src->seqhi = end + MAX(1, dst->max_win << dws);
3977                 if (win > src->max_win)
3978                         src->max_win = win;
3979
3980         } else {
3981                 ack = ntohl(th->th_ack) - dst->seqdiff;
3982                 if (src->seqdiff) {
3983                         /* Modulate sequence numbers */
3984                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3985                             src->seqdiff), 0);
3986                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3987                         *copyback = 1;
3988                 }
3989                 end = seq + pd->p_len;
3990                 if (th->th_flags & TH_SYN)
3991                         end++;
3992                 if (th->th_flags & TH_FIN)
3993                         end++;
3994         }
3995
3996         if ((th->th_flags & TH_ACK) == 0) {
3997                 /* Let it pass through the ack skew check */
3998                 ack = dst->seqlo;
3999         } else if ((ack == 0 &&
4000             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
4001             /* broken tcp stacks do not set ack */
4002             (dst->state < TCPS_SYN_SENT)) {
4003                 /*
4004                  * Many stacks (ours included) will set the ACK number in an
4005                  * FIN|ACK if the SYN times out -- no sequence to ACK.
4006                  */
4007                 ack = dst->seqlo;
4008         }
4009
4010         if (seq == end) {
4011                 /* Ease sequencing restrictions on no data packets */
4012                 seq = src->seqlo;
4013                 end = seq;
4014         }
4015
4016         ackskew = dst->seqlo - ack;
4017
4018
4019         /*
4020          * Need to demodulate the sequence numbers in any TCP SACK options
4021          * (Selective ACK). We could optionally validate the SACK values
4022          * against the current ACK window, either forwards or backwards, but
4023          * I'm not confident that SACK has been implemented properly
4024          * everywhere. It wouldn't surprise me if several stacks accidently
4025          * SACK too far backwards of previously ACKed data. There really aren't
4026          * any security implications of bad SACKing unless the target stack
4027          * doesn't validate the option length correctly. Someone trying to
4028          * spoof into a TCP connection won't bother blindly sending SACK
4029          * options anyway.
4030          */
4031         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4032                 if (pf_modulate_sack(m, off, pd, th, dst))
4033                         *copyback = 1;
4034         }
4035
4036
4037 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
4038         if (SEQ_GEQ(src->seqhi, end) &&
4039             /* Last octet inside other's window space */
4040             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4041             /* Retrans: not more than one window back */
4042             (ackskew >= -MAXACKWINDOW) &&
4043             /* Acking not more than one reassembled fragment backwards */
4044             (ackskew <= (MAXACKWINDOW << sws)) &&
4045             /* Acking not more than one window forward */
4046             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4047             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4048             (pd->flags & PFDESC_IP_REAS) == 0)) {
4049             /* Require an exact/+1 sequence match on resets when possible */
4050
4051                 if (dst->scrub || src->scrub) {
4052                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4053                             *state, src, dst, copyback))
4054                                 return (PF_DROP);
4055                 }
4056
4057                 /* update max window */
4058                 if (src->max_win < win)
4059                         src->max_win = win;
4060                 /* synchronize sequencing */
4061                 if (SEQ_GT(end, src->seqlo))
4062                         src->seqlo = end;
4063                 /* slide the window of what the other end can send */
4064                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4065                         dst->seqhi = ack + MAX((win << sws), 1);
4066
4067
4068                 /* update states */
4069                 if (th->th_flags & TH_SYN)
4070                         if (src->state < TCPS_SYN_SENT)
4071                                 src->state = TCPS_SYN_SENT;
4072                 if (th->th_flags & TH_FIN)
4073                         if (src->state < TCPS_CLOSING)
4074                                 src->state = TCPS_CLOSING;
4075                 if (th->th_flags & TH_ACK) {
4076                         if (dst->state == TCPS_SYN_SENT) {
4077                                 dst->state = TCPS_ESTABLISHED;
4078                                 if (src->state == TCPS_ESTABLISHED &&
4079                                     (*state)->src_node != NULL &&
4080                                     pf_src_connlimit(state)) {
4081                                         REASON_SET(reason, PFRES_SRCLIMIT);
4082                                         return (PF_DROP);
4083                                 }
4084                         } else if (dst->state == TCPS_CLOSING)
4085                                 dst->state = TCPS_FIN_WAIT_2;
4086                 }
4087                 if (th->th_flags & TH_RST)
4088                         src->state = dst->state = TCPS_TIME_WAIT;
4089
4090                 /* update expire time */
4091                 (*state)->expire = time_second;
4092                 if (src->state >= TCPS_FIN_WAIT_2 &&
4093                     dst->state >= TCPS_FIN_WAIT_2)
4094                         (*state)->timeout = PFTM_TCP_CLOSED;
4095                 else if (src->state >= TCPS_CLOSING &&
4096                     dst->state >= TCPS_CLOSING)
4097                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
4098                 else if (src->state < TCPS_ESTABLISHED ||
4099                     dst->state < TCPS_ESTABLISHED)
4100                         (*state)->timeout = PFTM_TCP_OPENING;
4101                 else if (src->state >= TCPS_CLOSING ||
4102                     dst->state >= TCPS_CLOSING)
4103                         (*state)->timeout = PFTM_TCP_CLOSING;
4104                 else
4105                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4106
4107                 /* Fall through to PASS packet */
4108
4109         } else if ((dst->state < TCPS_SYN_SENT ||
4110                 dst->state >= TCPS_FIN_WAIT_2 ||
4111                 src->state >= TCPS_FIN_WAIT_2) &&
4112             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4113             /* Within a window forward of the originating packet */
4114             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4115             /* Within a window backward of the originating packet */
4116
4117                 /*
4118                  * This currently handles three situations:
4119                  *  1) Stupid stacks will shotgun SYNs before their peer
4120                  *     replies.
4121                  *  2) When PF catches an already established stream (the
4122                  *     firewall rebooted, the state table was flushed, routes
4123                  *     changed...)
4124                  *  3) Packets get funky immediately after the connection
4125                  *     closes (this should catch Solaris spurious ACK|FINs
4126                  *     that web servers like to spew after a close)
4127                  *
4128                  * This must be a little more careful than the above code
4129                  * since packet floods will also be caught here. We don't
4130                  * update the TTL here to mitigate the damage of a packet
4131                  * flood and so the same code can handle awkward establishment
4132                  * and a loosened connection close.
4133                  * In the establishment case, a correct peer response will
4134                  * validate the connection, go through the normal state code
4135                  * and keep updating the state TTL.
4136                  */
4137
4138                 if (pf_status.debug >= PF_DEBUG_MISC) {
4139                         kprintf("pf: loose state match: ");
4140                         pf_print_state(*state);
4141                         pf_print_flags(th->th_flags);
4142                         kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4143                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len,
4144                             ackskew, (unsigned long long)(*state)->packets[0],
4145                             (unsigned long long)(*state)->packets[1],
4146                             pd->dir == PF_IN ? "in" : "out",
4147                             pd->dir == (*state)->direction ? "fwd" : "rev");
4148                 }
4149
4150                 if (dst->scrub || src->scrub) {
4151                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4152                             *state, src, dst, copyback))
4153                                 return (PF_DROP);
4154                 }
4155
4156                 /* update max window */
4157                 if (src->max_win < win)
4158                         src->max_win = win;
4159                 /* synchronize sequencing */
4160                 if (SEQ_GT(end, src->seqlo))
4161                         src->seqlo = end;
4162                 /* slide the window of what the other end can send */
4163                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4164                         dst->seqhi = ack + MAX((win << sws), 1);
4165
4166                 /*
4167                  * Cannot set dst->seqhi here since this could be a shotgunned
4168                  * SYN and not an already established connection.
4169                  */
4170
4171                 if (th->th_flags & TH_FIN)
4172                         if (src->state < TCPS_CLOSING)
4173                                 src->state = TCPS_CLOSING;
4174                 if (th->th_flags & TH_RST)
4175                         src->state = dst->state = TCPS_TIME_WAIT;
4176
4177                 /* Fall through to PASS packet */
4178
4179         } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY ||
4180                     ((*state)->pickup_mode == PF_PICKUPS_ENABLED &&
4181                      ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) !=
4182                       PFSTATE_GOT_SYN_MASK)) {
4183                 /*
4184                  * If pickup mode is hash only, do not fail on sequence checks.
4185                  *
4186                  * If pickup mode is enabled and we did not see the SYN in
4187                  * both direction, do not fail on sequence checks because
4188                  * we do not have complete information on window scale.
4189                  *
4190                  * Adjust expiration and fall through to PASS packet.
4191                  * XXX Add a FIN check to reduce timeout?
4192                  */
4193                 (*state)->expire = time_second;
4194         } else  {
4195                 /*
4196                  * Failure processing
4197                  */
4198                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4199                     (*state)->src.state == TCPS_SYN_SENT) {
4200                         /* Send RST for state mismatches during handshake */
4201                         if (!(th->th_flags & TH_RST))
4202                                 pf_send_tcp((*state)->rule.ptr, pd->af,
4203                                     pd->dst, pd->src, th->th_dport,
4204                                     th->th_sport, ntohl(th->th_ack), 0,
4205                                     TH_RST, 0, 0,
4206                                     (*state)->rule.ptr->return_ttl, 1, 0,
4207                                     pd->eh, kif->pfik_ifp);
4208                         src->seqlo = 0;
4209                         src->seqhi = 1;
4210                         src->max_win = 1;
4211                 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4212                         kprintf("pf: BAD state: ");
4213                         pf_print_state(*state);
4214                         pf_print_flags(th->th_flags);
4215                         kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4216                             "pkts=%llu:%llu dir=%s,%s\n",
4217                             seq, orig_seq, ack, pd->p_len, ackskew,
4218                             (unsigned long long)(*state)->packets[0],
4219                                 (unsigned long long)(*state)->packets[1],
4220                             pd->dir == PF_IN ? "in" : "out",
4221                             pd->dir == (*state)->direction ? "fwd" : "rev");
4222                         kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4223                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4224                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4225                             ' ': '2',
4226                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4227                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4228                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4229                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4230                 }
4231                 REASON_SET(reason, PFRES_BADSTATE);
4232                 return (PF_DROP);
4233         }
4234
4235         return (PF_PASS);
4236 }
4237
4238 int
4239 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4240         struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4241 {
4242         struct tcphdr           *th = pd->hdr.tcp;
4243
4244         if (th->th_flags & TH_SYN)
4245                 if (src->state < TCPS_SYN_SENT)
4246                         src->state = TCPS_SYN_SENT;
4247         if (th->th_flags & TH_FIN)
4248                 if (src->state < TCPS_CLOSING)
4249                         src->state = TCPS_CLOSING;
4250         if (th->th_flags & TH_ACK) {
4251                 if (dst->state == TCPS_SYN_SENT) {
4252                         dst->state = TCPS_ESTABLISHED;
4253                         if (src->state == TCPS_ESTABLISHED &&
4254                             (*state)->src_node != NULL &&
4255                             pf_src_connlimit(state)) {
4256                                 REASON_SET(reason, PFRES_SRCLIMIT);
4257                                 return (PF_DROP);
4258                         }
4259                 } else if (dst->state == TCPS_CLOSING) {
4260                         dst->state = TCPS_FIN_WAIT_2;
4261                 } else if (src->state == TCPS_SYN_SENT &&
4262                     dst->state < TCPS_SYN_SENT) {
4263                         /*
4264                          * Handle a special sloppy case where we only see one
4265                          * half of the connection. If there is a ACK after
4266                          * the initial SYN without ever seeing a packet from
4267                          * the destination, set the connection to established.
4268                          */
4269                         dst->state = src->state = TCPS_ESTABLISHED;
4270                         if ((*state)->src_node != NULL &&
4271                             pf_src_connlimit(state)) {
4272                                 REASON_SET(reason, PFRES_SRCLIMIT);
4273                                 return (PF_DROP);
4274                         }
4275                 } else if (src->state == TCPS_CLOSING &&
4276                     dst->state == TCPS_ESTABLISHED &&
4277                     dst->seqlo == 0) {
4278                         /*
4279                          * Handle the closing of half connections where we
4280                          * don't see the full bidirectional FIN/ACK+ACK
4281                          * handshake.
4282                          */
4283                         dst->state = TCPS_CLOSING;
4284                 }
4285         }
4286         if (th->th_flags & TH_RST)
4287                 src->state = dst->state = TCPS_TIME_WAIT;
4288
4289         /* update expire time */
4290         (*state)->expire = time_second;
4291         if (src->state >= TCPS_FIN_WAIT_2 &&
4292             dst->state >= TCPS_FIN_WAIT_2)
4293                 (*state)->timeout = PFTM_TCP_CLOSED;
4294         else if (src->state >= TCPS_CLOSING &&
4295             dst->state >= TCPS_CLOSING)
4296                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4297         else if (src->state < TCPS_ESTABLISHED ||
4298             dst->state < TCPS_ESTABLISHED)
4299                 (*state)->timeout = PFTM_TCP_OPENING;
4300         else if (src->state >= TCPS_CLOSING ||
4301             dst->state >= TCPS_CLOSING)
4302                 (*state)->timeout = PFTM_TCP_CLOSING;
4303         else
4304                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4305
4306         return (PF_PASS);
4307 }
4308
4309 int
4310 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4311     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4312     u_short *reason)
4313 {
4314         struct pf_state_key_cmp  key;
4315         struct tcphdr           *th = pd->hdr.tcp;
4316         int                      copyback = 0;
4317         struct pf_state_peer    *src, *dst;
4318         struct pf_state_key     *sk;
4319
4320         key.af = pd->af;
4321         key.proto = IPPROTO_TCP;
4322         if (direction == PF_IN) {       /* wire side, straight */
4323                 PF_ACPY(&key.addr[0], pd->src, key.af);
4324                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4325                 key.port[0] = th->th_sport;
4326                 key.port[1] = th->th_dport;
4327         } else {                        /* stack side, reverse */
4328                 PF_ACPY(&key.addr[1], pd->src, key.af);
4329                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4330                 key.port[1] = th->th_sport;
4331                 key.port[0] = th->th_dport;
4332         }
4333
4334         STATE_LOOKUP(kif, &key, direction, *state, m);
4335
4336         if (direction == (*state)->direction) {
4337                 src = &(*state)->src;
4338                 dst = &(*state)->dst;
4339         } else {
4340                 src = &(*state)->dst;
4341                 dst = &(*state)->src;
4342         }
4343
4344         sk = (*state)->key[pd->didx];
4345
4346         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4347                 if (direction != (*state)->direction) {
4348                         REASON_SET(reason, PFRES_SYNPROXY);
4349                         return (PF_SYNPROXY_DROP);
4350                 }
4351                 if (th->th_flags & TH_SYN) {
4352                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4353                                 REASON_SET(reason, PFRES_SYNPROXY);
4354                                 return (PF_DROP);
4355                         }
4356                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4357                             pd->src, th->th_dport, th->th_sport,
4358                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4359                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
4360                             0, NULL, NULL);
4361                         REASON_SET(reason, PFRES_SYNPROXY);
4362                         return (PF_SYNPROXY_DROP);
4363                 } else if (!(th->th_flags & TH_ACK) ||
4364                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4365                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4366                         REASON_SET(reason, PFRES_SYNPROXY);
4367                         return (PF_DROP);
4368                 } else if ((*state)->src_node != NULL &&
4369                     pf_src_connlimit(state)) {
4370                         REASON_SET(reason, PFRES_SRCLIMIT);
4371                         return (PF_DROP);
4372                 } else
4373                         (*state)->src.state = PF_TCPS_PROXY_DST;
4374         }
4375         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4376                 if (direction == (*state)->direction) {
4377                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4378                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4379                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4380                                 REASON_SET(reason, PFRES_SYNPROXY);
4381                                 return (PF_DROP);
4382                         }
4383                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4384                         if ((*state)->dst.seqhi == 1)
4385                                 (*state)->dst.seqhi = htonl(karc4random());
4386                         pf_send_tcp((*state)->rule.ptr, pd->af,
4387                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4388                             sk->port[pd->sidx], sk->port[pd->didx],
4389                             (*state)->dst.seqhi, 0, TH_SYN, 0,
4390                             (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
4391                         REASON_SET(reason, PFRES_SYNPROXY);
4392                         return (PF_SYNPROXY_DROP);
4393                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4394                     (TH_SYN|TH_ACK)) ||
4395                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4396                         REASON_SET(reason, PFRES_SYNPROXY);
4397                         return (PF_DROP);
4398                 } else {
4399                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4400                         (*state)->dst.seqlo = ntohl(th->th_seq);
4401                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4402                             pd->src, th->th_dport, th->th_sport,
4403                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4404                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
4405                             (*state)->tag, NULL, NULL);
4406                         pf_send_tcp((*state)->rule.ptr, pd->af,
4407                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4408                             sk->port[pd->sidx], sk->port[pd->didx],
4409                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4410                             TH_ACK, (*state)->dst.max_win, 0, 0, 1,
4411                             0, NULL, NULL);
4412                         (*state)->src.seqdiff = (*state)->dst.seqhi -
4413                             (*state)->src.seqlo;
4414                         (*state)->dst.seqdiff = (*state)->src.seqhi -
4415                             (*state)->dst.seqlo;
4416                         (*state)->src.seqhi = (*state)->src.seqlo +
4417                             (*state)->dst.max_win;
4418                         (*state)->dst.seqhi = (*state)->dst.seqlo +
4419                             (*state)->src.max_win;
4420                         (*state)->src.wscale = (*state)->dst.wscale = 0;
4421                         (*state)->src.state = (*state)->dst.state =
4422                             TCPS_ESTABLISHED;
4423                         REASON_SET(reason, PFRES_SYNPROXY);
4424                         return (PF_SYNPROXY_DROP);
4425                 }
4426         }
4427
4428         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4429             dst->state >= TCPS_FIN_WAIT_2 &&
4430             src->state >= TCPS_FIN_WAIT_2) {
4431                 if (pf_status.debug >= PF_DEBUG_MISC) {
4432                         kprintf("pf: state reuse ");
4433                         pf_print_state(*state);
4434                         pf_print_flags(th->th_flags);
4435                         kprintf("\n");
4436                 }
4437                 /* XXX make sure it's the same direction ?? */
4438                 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4439                 pf_unlink_state(*state);
4440                 *state = NULL;
4441                 return (PF_DROP);
4442         }
4443
4444         if ((*state)->state_flags & PFSTATE_SLOPPY) {
4445                 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4446                         return (PF_DROP);
4447         } else {
4448                 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4449                     &copyback) == PF_DROP)
4450                         return (PF_DROP);
4451         }
4452
4453         /* translate source/destination address, if necessary */
4454         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4455                 struct pf_state_key *nk = (*state)->key[pd->didx];
4456
4457                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4458                     nk->port[pd->sidx] != th->th_sport)
4459                         pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4460                             &th->th_sum, &nk->addr[pd->sidx],
4461                             nk->port[pd->sidx], 0, pd->af);
4462
4463                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4464                     nk->port[pd->didx] != th->th_dport) {
4465                         /*
4466                          * If we don't redispatch the packet will go into
4467                          * the protocol stack on the wrong cpu for the
4468                          * post-translated address.
4469                          */
4470                         m->m_flags &= ~M_HASH;
4471                         pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4472                             &th->th_sum, &nk->addr[pd->didx],
4473                             nk->port[pd->didx], 0, pd->af);
4474                 }
4475                 copyback = 1;
4476         }
4477
4478         /* Copyback sequence modulation or stateful scrub changes if needed */
4479         if (copyback)
4480                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4481
4482         return (PF_PASS);
4483 }
4484
4485 int
4486 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4487     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4488 {
4489         struct pf_state_peer    *src, *dst;
4490         struct pf_state_key_cmp  key;
4491         struct udphdr           *uh = pd->hdr.udp;
4492
4493         key.af = pd->af;
4494         key.proto = IPPROTO_UDP;
4495         if (direction == PF_IN) {       /* wire side, straight */
4496                 PF_ACPY(&key.addr[0], pd->src, key.af);
4497                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4498                 key.port[0] = uh->uh_sport;
4499                 key.port[1] = uh->uh_dport;
4500         } else {                        /* stack side, reverse */
4501                 PF_ACPY(&key.addr[1], pd->src, key.af);
4502                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4503                 key.port[1] = uh->uh_sport;
4504                 key.port[0] = uh->uh_dport;
4505         }
4506
4507         STATE_LOOKUP(kif, &key, direction, *state, m);
4508
4509         if (direction == (*state)->direction) {
4510                 src = &(*state)->src;
4511                 dst = &(*state)->dst;
4512         } else {
4513                 src = &(*state)->dst;
4514                 dst = &(*state)->src;
4515         }
4516
4517         /* update states */
4518         if (src->state < PFUDPS_SINGLE)
4519                 src->state = PFUDPS_SINGLE;
4520         if (dst->state == PFUDPS_SINGLE)
4521                 dst->state = PFUDPS_MULTIPLE;
4522
4523         /* update expire time */
4524         (*state)->expire = time_second;
4525         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4526                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4527         else
4528                 (*state)->timeout = PFTM_UDP_SINGLE;
4529
4530         /* translate source/destination address, if necessary */
4531         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4532                 struct pf_state_key *nk = (*state)->key[pd->didx];
4533
4534                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4535                     nk->port[pd->sidx] != uh->uh_sport)
4536                         pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4537                             &uh->uh_sum, &nk->addr[pd->sidx],
4538                             nk->port[pd->sidx], 1, pd->af);
4539
4540                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4541                     nk->port[pd->didx] != uh->uh_dport) {
4542                         /*
4543                          * If we don't redispatch the packet will go into
4544                          * the protocol stack on the wrong cpu for the
4545                          * post-translated address.
4546                          */
4547                         m->m_flags &= ~M_HASH;
4548                         pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4549                             &uh->uh_sum, &nk->addr[pd->didx],
4550                             nk->port[pd->didx], 1, pd->af);
4551                 }
4552                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4553         }
4554
4555         return (PF_PASS);
4556 }
4557
4558 int
4559 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4560     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4561 {
4562         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4563         u_int16_t        icmpid = 0, *icmpsum;
4564         u_int8_t         icmptype;
4565         int              state_icmp = 0;
4566         struct pf_state_key_cmp key;
4567
4568         switch (pd->proto) {
4569 #ifdef INET
4570         case IPPROTO_ICMP:
4571                 icmptype = pd->hdr.icmp->icmp_type;
4572                 icmpid = pd->hdr.icmp->icmp_id;
4573                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4574
4575                 if (icmptype == ICMP_UNREACH ||
4576                     icmptype == ICMP_SOURCEQUENCH ||
4577                     icmptype == ICMP_REDIRECT ||
4578                     icmptype == ICMP_TIMXCEED ||
4579                     icmptype == ICMP_PARAMPROB)
4580                         state_icmp++;
4581                 break;
4582 #endif /* INET */
4583 #ifdef INET6
4584         case IPPROTO_ICMPV6:
4585                 icmptype = pd->hdr.icmp6->icmp6_type;
4586                 icmpid = pd->hdr.icmp6->icmp6_id;
4587                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4588
4589                 if (icmptype == ICMP6_DST_UNREACH ||
4590                     icmptype == ICMP6_PACKET_TOO_BIG ||
4591                     icmptype == ICMP6_TIME_EXCEEDED ||
4592                     icmptype == ICMP6_PARAM_PROB)
4593                         state_icmp++;
4594                 break;
4595 #endif /* INET6 */
4596         }
4597
4598         if (!state_icmp) {
4599
4600                 /*
4601                  * ICMP query/reply message not related to a TCP/UDP packet.
4602                  * Search for an ICMP state.
4603                  */
4604                 key.af = pd->af;
4605                 key.proto = pd->proto;
4606                 key.port[0] = key.port[1] = icmpid;
4607                 if (direction == PF_IN) {       /* wire side, straight */
4608                         PF_ACPY(&key.addr[0], pd->src, key.af);
4609                         PF_ACPY(&key.addr[1], pd->dst, key.af);
4610                 } else {                        /* stack side, reverse */
4611                         PF_ACPY(&key.addr[1], pd->src, key.af);
4612                         PF_ACPY(&key.addr[0], pd->dst, key.af);
4613                 }
4614
4615                 STATE_LOOKUP(kif, &key, direction, *state, m);
4616
4617                 (*state)->expire = time_second;
4618                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4619
4620                 /* translate source/destination address, if necessary */
4621                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4622                         struct pf_state_key *nk = (*state)->key[pd->didx];
4623
4624                         switch (pd->af) {
4625 #ifdef INET
4626                         case AF_INET:
4627                                 if (PF_ANEQ(pd->src,
4628                                     &nk->addr[pd->sidx], AF_INET))
4629                                         pf_change_a(&saddr->v4.s_addr,
4630                                             pd->ip_sum,
4631                                             nk->addr[pd->sidx].v4.s_addr, 0);
4632
4633                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4634                                     AF_INET))
4635                                         pf_change_a(&daddr->v4.s_addr,
4636                                             pd->ip_sum,
4637                                             nk->addr[pd->didx].v4.s_addr, 0);
4638
4639                                 if (nk->port[0] !=
4640                                     pd->hdr.icmp->icmp_id) {
4641                                         pd->hdr.icmp->icmp_cksum =
4642                                             pf_cksum_fixup(
4643                                             pd->hdr.icmp->icmp_cksum, icmpid,
4644                                             nk->port[pd->sidx], 0);
4645                                         pd->hdr.icmp->icmp_id =
4646                                             nk->port[pd->sidx];
4647                                 }
4648
4649                                 m_copyback(m, off, ICMP_MINLEN,
4650                                     (caddr_t)pd->hdr.icmp);
4651                                 break;
4652 #endif /* INET */
4653 #ifdef INET6
4654                         case AF_INET6:
4655                                 if (PF_ANEQ(pd->src,
4656                                     &nk->addr[pd->sidx], AF_INET6))
4657                                         pf_change_a6(saddr,
4658                                             &pd->hdr.icmp6->icmp6_cksum,
4659                                             &nk->addr[pd->sidx], 0);
4660
4661                                 if (PF_ANEQ(pd->dst,
4662                                     &nk->addr[pd->didx], AF_INET6))
4663                                         pf_change_a6(daddr,
4664                                             &pd->hdr.icmp6->icmp6_cksum,
4665                                             &nk->addr[pd->didx], 0);
4666
4667                                 m_copyback(m, off,
4668                                         sizeof(struct icmp6_hdr),
4669                                         (caddr_t)pd->hdr.icmp6);
4670                                 break;
4671 #endif /* INET6 */
4672                         }
4673                 }
4674                 return (PF_PASS);
4675
4676         } else {
4677                 /*
4678                  * ICMP error message in response to a TCP/UDP packet.
4679                  * Extract the inner TCP/UDP header and search for that state.
4680                  */
4681
4682                 struct pf_pdesc pd2;
4683 #ifdef INET
4684                 struct ip       h2;
4685 #endif /* INET */
4686 #ifdef INET6
4687                 struct ip6_hdr  h2_6;
4688                 int             terminal = 0;
4689 #endif /* INET6 */
4690                 int             ipoff2;
4691                 int             off2;
4692
4693                 pd2.af = pd->af;
4694                 /* Payload packet is from the opposite direction. */
4695                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
4696                 pd2.didx = (direction == PF_IN) ? 0 : 1;
4697                 switch (pd->af) {
4698 #ifdef INET
4699                 case AF_INET:
4700                         /* offset of h2 in mbuf chain */
4701                         ipoff2 = off + ICMP_MINLEN;
4702
4703                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4704                             NULL, reason, pd2.af)) {
4705                                 DPFPRINTF(PF_DEBUG_MISC,
4706                                     ("pf: ICMP error message too short "
4707                                     "(ip)\n"));
4708                                 return (PF_DROP);
4709                         }
4710                         /*
4711                          * ICMP error messages don't refer to non-first
4712                          * fragments
4713                          */
4714                         if (h2.ip_off & htons(IP_OFFMASK)) {
4715                                 REASON_SET(reason, PFRES_FRAG);
4716                                 return (PF_DROP);
4717                         }
4718
4719                         /* offset of protocol header that follows h2 */
4720                         off2 = ipoff2 + (h2.ip_hl << 2);
4721
4722                         pd2.proto = h2.ip_p;
4723                         pd2.src = (struct pf_addr *)&h2.ip_src;
4724                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4725                         pd2.ip_sum = &h2.ip_sum;
4726                         break;
4727 #endif /* INET */
4728 #ifdef INET6
4729                 case AF_INET6:
4730                         ipoff2 = off + sizeof(struct icmp6_hdr);
4731
4732                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4733                             NULL, reason, pd2.af)) {
4734                                 DPFPRINTF(PF_DEBUG_MISC,
4735                                     ("pf: ICMP error message too short "
4736                                     "(ip6)\n"));
4737                                 return (PF_DROP);
4738                         }
4739                         pd2.proto = h2_6.ip6_nxt;
4740                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4741                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4742                         pd2.ip_sum = NULL;
4743                         off2 = ipoff2 + sizeof(h2_6);
4744                         do {
4745                                 switch (pd2.proto) {
4746                                 case IPPROTO_FRAGMENT:
4747                                         /*
4748                                          * ICMPv6 error messages for
4749                                          * non-first fragments
4750                                          */
4751                                         REASON_SET(reason, PFRES_FRAG);
4752                                         return (PF_DROP);
4753                                 case IPPROTO_AH:
4754                                 case IPPROTO_HOPOPTS:
4755                                 case IPPROTO_ROUTING:
4756                                 case IPPROTO_DSTOPTS: {
4757                                         /* get next header and header length */
4758                                         struct ip6_ext opt6;
4759
4760                                         if (!pf_pull_hdr(m, off2, &opt6,
4761                                             sizeof(opt6), NULL, reason,
4762                                             pd2.af)) {
4763                                                 DPFPRINTF(PF_DEBUG_MISC,
4764                                                     ("pf: ICMPv6 short opt\n"));
4765                                                 return (PF_DROP);
4766                                         }
4767                                         if (pd2.proto == IPPROTO_AH)
4768                                                 off2 += (opt6.ip6e_len + 2) * 4;
4769                                         else
4770                                                 off2 += (opt6.ip6e_len + 1) * 8;
4771                                         pd2.proto = opt6.ip6e_nxt;
4772                                         /* goto the next header */
4773                                         break;
4774                                 }
4775                                 default:
4776                                         terminal++;
4777                                         break;
4778                                 }
4779                         } while (!terminal);
4780                         break;
4781 #endif /* INET6 */
4782                 default:
4783                         DPFPRINTF(PF_DEBUG_MISC,
4784                             ("pf: ICMP AF %d unknown (ip6)\n", pd->af));
4785                         return (PF_DROP);
4786                         break;
4787                 }
4788
4789                 switch (pd2.proto) {
4790                 case IPPROTO_TCP: {
4791                         struct tcphdr            th;
4792                         u_int32_t                seq;
4793                         struct pf_state_peer    *src, *dst;
4794                         u_int8_t                 dws;
4795                         int                      copyback = 0;
4796
4797                         /*
4798                          * Only the first 8 bytes of the TCP header can be
4799                          * expected. Don't access any TCP header fields after
4800                          * th_seq, an ackskew test is not possible.
4801                          */
4802                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4803                             pd2.af)) {
4804                                 DPFPRINTF(PF_DEBUG_MISC,
4805                                     ("pf: ICMP error message too short "
4806                                     "(tcp)\n"));
4807                                 return (PF_DROP);
4808                         }
4809
4810                         key.af = pd2.af;
4811                         key.proto = IPPROTO_TCP;
4812                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4813                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4814                         key.port[pd2.sidx] = th.th_sport;
4815                         key.port[pd2.didx] = th.th_dport;
4816
4817                         STATE_LOOKUP(kif, &key, direction, *state, m);
4818
4819                         if (direction == (*state)->direction) {
4820                                 src = &(*state)->dst;
4821                                 dst = &(*state)->src;
4822                         } else {
4823                                 src = &(*state)->src;
4824                                 dst = &(*state)->dst;
4825                         }
4826
4827                         if (src->wscale && dst->wscale)
4828                                 dws = dst->wscale & PF_WSCALE_MASK;
4829                         else
4830                                 dws = 0;
4831
4832                         /* Demodulate sequence number */
4833                         seq = ntohl(th.th_seq) - src->seqdiff;
4834                         if (src->seqdiff) {
4835                                 pf_change_a(&th.th_seq, icmpsum,
4836                                     htonl(seq), 0);
4837                                 copyback = 1;
4838                         }
4839
4840                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4841                             (!SEQ_GEQ(src->seqhi, seq) ||
4842                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4843                                 if (pf_status.debug >= PF_DEBUG_MISC) {
4844                                         kprintf("pf: BAD ICMP %d:%d ",
4845                                             icmptype, pd->hdr.icmp->icmp_code);
4846                                         pf_print_host(pd->src, 0, pd->af);
4847                                         kprintf(" -> ");
4848                                         pf_print_host(pd->dst, 0, pd->af);
4849                                         kprintf(" state: ");
4850                                         pf_print_state(*state);
4851                                         kprintf(" seq=%u\n", seq);
4852                                 }
4853                                 REASON_SET(reason, PFRES_BADSTATE);
4854                                 return (PF_DROP);
4855                         } else {
4856                                 if (pf_status.debug >= PF_DEBUG_MISC) {
4857                                         kprintf("pf: OK ICMP %d:%d ",
4858                                             icmptype, pd->hdr.icmp->icmp_code);
4859                                         pf_print_host(pd->src, 0, pd->af);
4860                                         kprintf(" -> ");
4861                                         pf_print_host(pd->dst, 0, pd->af);
4862                                         kprintf(" state: ");
4863                                         pf_print_state(*state);
4864                                         kprintf(" seq=%u\n", seq);
4865                                 }
4866                         }
4867
4868                         /* translate source/destination address, if necessary */
4869                         if ((*state)->key[PF_SK_WIRE] !=
4870                             (*state)->key[PF_SK_STACK]) {
4871                                 struct pf_state_key *nk =
4872                                     (*state)->key[pd->didx];
4873
4874                                 if (PF_ANEQ(pd2.src,
4875                                     &nk->addr[pd2.sidx], pd2.af) ||
4876                                     nk->port[pd2.sidx] != th.th_sport)
4877                                         pf_change_icmp(pd2.src, &th.th_sport,
4878                                             daddr, &nk->addr[pd2.sidx],
4879                                             nk->port[pd2.sidx], NULL,
4880                                             pd2.ip_sum, icmpsum,
4881                                             pd->ip_sum, 0, pd2.af);
4882
4883                                 if (PF_ANEQ(pd2.dst,
4884                                     &nk->addr[pd2.didx], pd2.af) ||
4885                                     nk->port[pd2.didx] != th.th_dport)
4886                                         pf_change_icmp(pd2.dst, &th.th_dport,
4887                                             NULL, /* XXX Inbound NAT? */
4888                                             &nk->addr[pd2.didx],
4889                                             nk->port[pd2.didx], NULL,
4890                                             pd2.ip_sum, icmpsum,
4891                                             pd->ip_sum, 0, pd2.af);
4892                                 copyback = 1;
4893                         }
4894
4895                         if (copyback) {
4896                                 switch (pd2.af) {
4897 #ifdef INET
4898                                 case AF_INET:
4899                                         m_copyback(m, off, ICMP_MINLEN,
4900                                             (caddr_t)pd->hdr.icmp);
4901                                         m_copyback(m, ipoff2, sizeof(h2),
4902                                             (caddr_t)&h2);
4903                                         break;
4904 #endif /* INET */
4905 #ifdef INET6
4906                                 case AF_INET6:
4907                                         m_copyback(m, off,
4908                                             sizeof(struct icmp6_hdr),
4909                                             (caddr_t)pd->hdr.icmp6);
4910                                         m_copyback(m, ipoff2, sizeof(h2_6),
4911                                             (caddr_t)&h2_6);
4912                                         break;
4913 #endif /* INET6 */
4914                                 }
4915                                 m_copyback(m, off2, 8, (caddr_t)&th);
4916                         }
4917
4918                         return (PF_PASS);
4919                         break;
4920                 }
4921                 case IPPROTO_UDP: {
4922                         struct udphdr           uh;
4923
4924                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4925                             NULL, reason, pd2.af)) {
4926                                 DPFPRINTF(PF_DEBUG_MISC,
4927                                     ("pf: ICMP error message too short "
4928                                     "(udp)\n"));
4929                                 return (PF_DROP);
4930                         }
4931
4932                         key.af = pd2.af;
4933                         key.proto = IPPROTO_UDP;
4934                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4935                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4936                         key.port[pd2.sidx] = uh.uh_sport;
4937                         key.port[pd2.didx] = uh.uh_dport;
4938
4939                         STATE_LOOKUP(kif, &key, direction, *state, m);
4940
4941                         /* translate source/destination address, if necessary */
4942                         if ((*state)->key[PF_SK_WIRE] !=
4943                             (*state)->key[PF_SK_STACK]) {
4944                                 struct pf_state_key *nk =
4945                                     (*state)->key[pd->didx];
4946
4947                                 if (PF_ANEQ(pd2.src,
4948                                     &nk->addr[pd2.sidx], pd2.af) ||
4949                                     nk->port[pd2.sidx] != uh.uh_sport)
4950                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4951                                             daddr, &nk->addr[pd2.sidx],
4952                                             nk->port[pd2.sidx], &uh.uh_sum,
4953                                             pd2.ip_sum, icmpsum,
4954                                             pd->ip_sum, 1, pd2.af);
4955
4956                                 if (PF_ANEQ(pd2.dst,
4957                                     &nk->addr[pd2.didx], pd2.af) ||
4958                                     nk->port[pd2.didx] != uh.uh_dport)
4959                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4960                                             NULL, /* XXX Inbound NAT? */
4961                                             &nk->addr[pd2.didx],
4962                                             nk->port[pd2.didx], &uh.uh_sum,
4963                                             pd2.ip_sum, icmpsum,
4964                                             pd->ip_sum, 1, pd2.af);
4965
4966                                 switch (pd2.af) {
4967 #ifdef INET
4968                                 case AF_INET:
4969                                         m_copyback(m, off, ICMP_MINLEN,
4970                                             (caddr_t)pd->hdr.icmp);
4971                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4972                                         break;
4973 #endif /* INET */
4974 #ifdef INET6
4975                                 case AF_INET6:
4976                                         m_copyback(m, off,
4977                                             sizeof(struct icmp6_hdr),
4978                                             (caddr_t)pd->hdr.icmp6);
4979                                         m_copyback(m, ipoff2, sizeof(h2_6),
4980                                             (caddr_t)&h2_6);
4981                                         break;
4982 #endif /* INET6 */
4983                                 }
4984                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4985                         }
4986
4987                         return (PF_PASS);
4988                         break;
4989                 }
4990 #ifdef INET
4991                 case IPPROTO_ICMP: {
4992                         struct icmp             iih;
4993
4994                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4995                             NULL, reason, pd2.af)) {
4996                                 DPFPRINTF(PF_DEBUG_MISC,
4997                                     ("pf: ICMP error message too short i"
4998                                     "(icmp)\n"));
4999                                 return (PF_DROP);
5000                         }
5001
5002                         key.af = pd2.af;
5003                         key.proto = IPPROTO_ICMP;
5004                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5005                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5006                         key.port[0] = key.port[1] = iih.icmp_id;
5007
5008                         STATE_LOOKUP(kif, &key, direction, *state, m);
5009
5010                         /* translate source/destination address, if necessary */
5011                         if ((*state)->key[PF_SK_WIRE] !=
5012                             (*state)->key[PF_SK_STACK]) {
5013                                 struct pf_state_key *nk =
5014                                     (*state)->key[pd->didx];
5015
5016                                 if (PF_ANEQ(pd2.src,
5017                                     &nk->addr[pd2.sidx], pd2.af) ||
5018                                     nk->port[pd2.sidx] != iih.icmp_id)
5019                                         pf_change_icmp(pd2.src, &iih.icmp_id,
5020                                             daddr, &nk->addr[pd2.sidx],
5021                                             nk->port[pd2.sidx], NULL,
5022                                             pd2.ip_sum, icmpsum,
5023                                             pd->ip_sum, 0, AF_INET);
5024
5025                                 if (PF_ANEQ(pd2.dst,
5026                                     &nk->addr[pd2.didx], pd2.af) ||
5027                                     nk->port[pd2.didx] != iih.icmp_id)
5028                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
5029                                             NULL, /* XXX Inbound NAT? */
5030                                             &nk->addr[pd2.didx],
5031                                             nk->port[pd2.didx], NULL,
5032                                             pd2.ip_sum, icmpsum,
5033                                             pd->ip_sum, 0, AF_INET);
5034
5035                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
5036                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5037                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
5038                         }
5039                         return (PF_PASS);
5040                         break;
5041                 }
5042 #endif /* INET */
5043 #ifdef INET6
5044                 case IPPROTO_ICMPV6: {
5045                         struct icmp6_hdr        iih;
5046
5047                         if (!pf_pull_hdr(m, off2, &iih,
5048                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5049                                 DPFPRINTF(PF_DEBUG_MISC,
5050                                     ("pf: ICMP error message too short "
5051                                     "(icmp6)\n"));
5052                                 return (PF_DROP);
5053                         }
5054
5055                         key.af = pd2.af;
5056                         key.proto = IPPROTO_ICMPV6;
5057                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5058                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5059                         key.port[0] = key.port[1] = iih.icmp6_id;
5060
5061                         STATE_LOOKUP(kif, &key, direction, *state, m);
5062
5063                         /* translate source/destination address, if necessary */
5064                         if ((*state)->key[PF_SK_WIRE] !=
5065                             (*state)->key[PF_SK_STACK]) {
5066                                 struct pf_state_key *nk =
5067                                     (*state)->key[pd->didx];
5068
5069                                 if (PF_ANEQ(pd2.src,
5070                                     &nk->addr[pd2.sidx], pd2.af) ||
5071                                     nk->port[pd2.sidx] != iih.icmp6_id)
5072                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
5073                                             daddr, &nk->addr[pd2.sidx],
5074                                             nk->port[pd2.sidx], NULL,
5075                                             pd2.ip_sum, icmpsum,
5076                                             pd->ip_sum, 0, AF_INET6);
5077
5078                                 if (PF_ANEQ(pd2.dst,
5079                                     &nk->addr[pd2.didx], pd2.af) ||
5080                                     nk->port[pd2.didx] != iih.icmp6_id)
5081                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
5082                                             NULL, /* XXX Inbound NAT? */
5083                                             &nk->addr[pd2.didx],
5084                                             nk->port[pd2.didx], NULL,
5085                                             pd2.ip_sum, icmpsum,
5086                                             pd->ip_sum, 0, AF_INET6);
5087
5088                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
5089                                     (caddr_t)pd->hdr.icmp6);
5090                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5091                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5092                                     (caddr_t)&iih);
5093                         }
5094
5095                         return (PF_PASS);
5096                         break;
5097                 }
5098 #endif /* INET6 */
5099                 default: {
5100                         key.af = pd2.af;
5101                         key.proto = pd2.proto;
5102                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5103                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5104                         key.port[0] = key.port[1] = 0;
5105
5106                         STATE_LOOKUP(kif, &key, direction, *state, m);
5107
5108                         /* translate source/destination address, if necessary */
5109                         if ((*state)->key[PF_SK_WIRE] !=
5110                             (*state)->key[PF_SK_STACK]) {
5111                                 struct pf_state_key *nk =
5112                                     (*state)->key[pd->didx];
5113
5114                                 if (PF_ANEQ(pd2.src,
5115                                     &nk->addr[pd2.sidx], pd2.af))
5116                                         pf_change_icmp(pd2.src, NULL, daddr,
5117                                             &nk->addr[pd2.sidx], 0, NULL,
5118                                             pd2.ip_sum, icmpsum,
5119                                             pd->ip_sum, 0, pd2.af);
5120
5121                                 if (PF_ANEQ(pd2.dst,
5122                                     &nk->addr[pd2.didx], pd2.af))
5123                                         pf_change_icmp(pd2.src, NULL,
5124                                             NULL, /* XXX Inbound NAT? */
5125                                             &nk->addr[pd2.didx], 0, NULL,
5126                                             pd2.ip_sum, icmpsum,
5127                                             pd->ip_sum, 0, pd2.af);
5128
5129                                 switch (pd2.af) {
5130 #ifdef INET
5131                                 case AF_INET:
5132                                         m_copyback(m, off, ICMP_MINLEN,
5133                                             (caddr_t)pd->hdr.icmp);
5134                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5135                                         break;
5136 #endif /* INET */
5137 #ifdef INET6
5138                                 case AF_INET6:
5139                                         m_copyback(m, off,
5140                                             sizeof(struct icmp6_hdr),
5141                                             (caddr_t)pd->hdr.icmp6);
5142                                         m_copyback(m, ipoff2, sizeof(h2_6),
5143                                             (caddr_t)&h2_6);
5144                                         break;
5145 #endif /* INET6 */
5146                                 }
5147                         }
5148                         return (PF_PASS);
5149                         break;
5150                 }
5151                 }
5152         }
5153 }
5154
5155 int
5156 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5157     struct mbuf *m, struct pf_pdesc *pd)
5158 {
5159         struct pf_state_peer    *src, *dst;
5160         struct pf_state_key_cmp  key;
5161
5162         key.af = pd->af;
5163         key.proto = pd->proto;
5164         if (direction == PF_IN) {
5165                 PF_ACPY(&key.addr[0], pd->src, key.af);
5166                 PF_ACPY(&key.addr[1], pd->dst, key.af);
5167                 key.port[0] = key.port[1] = 0;
5168         } else {
5169                 PF_ACPY(&key.addr[1], pd->src, key.af);
5170                 PF_ACPY(&key.addr[0], pd->dst, key.af);
5171                 key.port[1] = key.port[0] = 0;
5172         }
5173
5174         STATE_LOOKUP(kif, &key, direction, *state, m);
5175
5176         if (direction == (*state)->direction) {
5177                 src = &(*state)->src;
5178                 dst = &(*state)->dst;
5179         } else {
5180                 src = &(*state)->dst;
5181                 dst = &(*state)->src;
5182         }
5183
5184         /* update states */
5185         if (src->state < PFOTHERS_SINGLE)
5186                 src->state = PFOTHERS_SINGLE;
5187         if (dst->state == PFOTHERS_SINGLE)
5188                 dst->state = PFOTHERS_MULTIPLE;
5189
5190         /* update expire time */
5191         (*state)->expire = time_second;
5192         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5193                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5194         else
5195                 (*state)->timeout = PFTM_OTHER_SINGLE;
5196
5197         /* translate source/destination address, if necessary */
5198         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5199                 struct pf_state_key *nk = (*state)->key[pd->didx];
5200
5201                 KKASSERT(nk);
5202                 KKASSERT(pd);
5203                 KKASSERT(pd->src);
5204                 KKASSERT(pd->dst);
5205                 switch (pd->af) {
5206 #ifdef INET
5207                 case AF_INET:
5208                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5209                                 pf_change_a(&pd->src->v4.s_addr,
5210                                     pd->ip_sum,
5211                                     nk->addr[pd->sidx].v4.s_addr,
5212                                     0);
5213
5214
5215                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5216                                 pf_change_a(&pd->dst->v4.s_addr,
5217                                     pd->ip_sum,
5218                                     nk->addr[pd->didx].v4.s_addr,
5219                                     0);
5220
5221                                 break;
5222 #endif /* INET */
5223 #ifdef INET6
5224                 case AF_INET6:
5225                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5226                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5227
5228                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5229                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5230 #endif /* INET6 */
5231                 }
5232         }
5233         return (PF_PASS);
5234 }
5235
5236 /*
5237  * ipoff and off are measured from the start of the mbuf chain.
5238  * h must be at "ipoff" on the mbuf chain.
5239  */
5240 void *
5241 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5242     u_short *actionp, u_short *reasonp, sa_family_t af)
5243 {
5244         switch (af) {
5245 #ifdef INET
5246         case AF_INET: {
5247                 struct ip       *h = mtod(m, struct ip *);
5248                 u_int16_t        fragoff = (h->ip_off & IP_OFFMASK) << 3;
5249
5250                 if (fragoff) {
5251                         if (fragoff >= len)
5252                                 ACTION_SET(actionp, PF_PASS);
5253                         else {
5254                                 ACTION_SET(actionp, PF_DROP);
5255                                 REASON_SET(reasonp, PFRES_FRAG);
5256                         }
5257                         return (NULL);
5258                 }
5259                 if (m->m_pkthdr.len < off + len ||
5260                     h->ip_len < off + len) {
5261                         ACTION_SET(actionp, PF_DROP);
5262                         REASON_SET(reasonp, PFRES_SHORT);
5263                         return (NULL);
5264                 }
5265                 break;
5266         }
5267 #endif /* INET */
5268 #ifdef INET6
5269         case AF_INET6: {
5270                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
5271
5272                 if (m->m_pkthdr.len < off + len ||
5273                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5274                     (unsigned)(off + len)) {
5275                         ACTION_SET(actionp, PF_DROP);
5276                         REASON_SET(reasonp, PFRES_SHORT);
5277                         return (NULL);
5278                 }
5279                 break;
5280         }
5281 #endif /* INET6 */
5282         }
5283         m_copydata(m, off, len, p);
5284         return (p);
5285 }
5286
5287 int
5288 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif)
5289 {
5290         struct sockaddr_in      *dst;
5291         int                      ret = 1;
5292         int                      check_mpath;
5293 #ifdef INET6
5294         struct sockaddr_in6     *dst6;
5295         struct route_in6         ro;
5296 #else
5297         struct route             ro;
5298 #endif
5299         struct radix_node       *rn;
5300         struct rtentry          *rt;
5301         struct ifnet            *ifp;
5302
5303         check_mpath = 0;
5304         bzero(&ro, sizeof(ro));
5305         switch (af) {
5306         case AF_INET:
5307                 dst = satosin(&ro.ro_dst);
5308                 dst->sin_family = AF_INET;
5309                 dst->sin_len = sizeof(*dst);
5310                 dst->sin_addr = addr->v4;
5311                 break;
5312 #ifdef INET6
5313         case AF_INET6:
5314                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5315                 dst6->sin6_family = AF_INET6;
5316                 dst6->sin6_len = sizeof(*dst6);
5317                 dst6->sin6_addr = addr->v6;
5318                 break;
5319 #endif /* INET6 */
5320         default:
5321                 return (0);
5322         }
5323
5324         /* Skip checks for ipsec interfaces */
5325         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5326                 goto out;
5327
5328         rtalloc_ign((struct route *)&ro, 0);
5329
5330         if (ro.ro_rt != NULL) {
5331                 /* No interface given, this is a no-route check */
5332                 if (kif == NULL)
5333                         goto out;
5334
5335                 if (kif->pfik_ifp == NULL) {
5336                         ret = 0;
5337                         goto out;
5338                 }
5339
5340                 /* Perform uRPF check if passed input interface */
5341                 ret = 0;
5342                 rn = (struct radix_node *)ro.ro_rt;
5343                 do {
5344                         rt = (struct rtentry *)rn;
5345                         ifp = rt->rt_ifp;
5346
5347                         if (kif->pfik_ifp == ifp)
5348                                 ret = 1;
5349                         rn = NULL;
5350                 } while (check_mpath == 1 && rn != NULL && ret == 0);
5351         } else
5352                 ret = 0;
5353 out:
5354         if (ro.ro_rt != NULL)
5355                 RTFREE(ro.ro_rt);
5356         return (ret);
5357 }
5358
5359 int
5360 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw)
5361 {
5362         struct sockaddr_in      *dst;
5363 #ifdef INET6
5364         struct sockaddr_in6     *dst6;
5365         struct route_in6         ro;
5366 #else
5367         struct route             ro;
5368 #endif
5369         int                      ret = 0;
5370
5371         ASSERT_LWKT_TOKEN_HELD(&pf_token);
5372
5373         bzero(&ro, sizeof(ro));
5374         switch (af) {
5375         case AF_INET:
5376                 dst = satosin(&ro.ro_dst);
5377                 dst->sin_family = AF_INET;
5378                 dst->sin_len = sizeof(*dst);
5379                 dst->sin_addr = addr->v4;
5380                 break;
5381 #ifdef INET6
5382         case AF_INET6:
5383                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5384                 dst6->sin6_family = AF_INET6;
5385                 dst6->sin6_len = sizeof(*dst6);
5386                 dst6->sin6_addr = addr->v6;
5387                 break;
5388 #endif /* INET6 */
5389         default:
5390                 return (0);
5391         }
5392
5393 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING));
5394
5395         if (ro.ro_rt != NULL) {
5396                 RTFREE(ro.ro_rt);
5397         }
5398
5399         return (ret);
5400 }
5401
5402 #ifdef INET
5403 void
5404 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5405     struct pf_state *s, struct pf_pdesc *pd)
5406 {
5407         struct mbuf             *m0, *m1;
5408         struct route             iproute;
5409         struct route            *ro = NULL;
5410         struct sockaddr_in      *dst;
5411         struct ip               *ip;
5412         struct ifnet            *ifp = NULL;
5413         struct pf_addr           naddr;
5414         struct pf_src_node      *sn = NULL;
5415         int                      error = 0;
5416         int sw_csum;
5417 #ifdef IPSEC
5418         struct m_tag            *mtag;
5419 #endif /* IPSEC */
5420
5421         ASSERT_LWKT_TOKEN_HELD(&pf_token);
5422
5423         if (m == NULL || *m == NULL || r == NULL ||
5424             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5425                 panic("pf_route: invalid parameters");
5426
5427         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5428                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5429                 (*m)->m_pkthdr.pf.routed = 1;
5430         } else {
5431                 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5432                         m0 = *m;
5433                         *m = NULL;
5434                         goto bad;
5435                 }
5436         }
5437
5438         if (r->rt == PF_DUPTO) {
5439                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) {
5440                         return;
5441                 }
5442         } else {
5443                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5444                         return;
5445                 }
5446                 m0 = *m;
5447         }
5448
5449         if (m0->m_len < sizeof(struct ip)) {
5450                 DPFPRINTF(PF_DEBUG_URGENT,
5451                     ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5452                 goto bad;
5453         }
5454
5455         ip = mtod(m0, struct ip *);
5456
5457         ro = &iproute;
5458         bzero((caddr_t)ro, sizeof(*ro));
5459         dst = satosin(&ro->ro_dst);
5460         dst->sin_family = AF_INET;
5461         dst->sin_len = sizeof(*dst);
5462         dst->sin_addr = ip->ip_dst;
5463
5464         if (r->rt == PF_FASTROUTE) {
5465                 rtalloc(ro);
5466                 if (ro->ro_rt == 0) {
5467                         ipstat.ips_noroute++;
5468                         goto bad;
5469                 }
5470
5471                 ifp = ro->ro_rt->rt_ifp;
5472                 ro->ro_rt->rt_use++;
5473
5474                 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
5475                         dst = satosin(ro->ro_rt->rt_gateway);
5476         } else {
5477                 if (TAILQ_EMPTY(&r->rpool.list)) {
5478                         DPFPRINTF(PF_DEBUG_URGENT,
5479                             ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
5480                         goto bad;
5481                 }
5482                 if (s == NULL) {
5483                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5484                             &naddr, NULL, &sn);
5485                         if (!PF_AZERO(&naddr, AF_INET))
5486                                 dst->sin_addr.s_addr = naddr.v4.s_addr;
5487                         ifp = r->rpool.cur->kif ?
5488                             r->rpool.cur->kif->pfik_ifp : NULL;
5489                 } else {
5490                         if (!PF_AZERO(&s->rt_addr, AF_INET))
5491                                 dst->sin_addr.s_addr =
5492                                     s->rt_addr.v4.s_addr;
5493                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5494                 }
5495         }
5496         if (ifp == NULL)
5497                 goto bad;
5498
5499         if (oifp != ifp) {
5500                 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5501                         goto bad;
5502                 } else if (m0 == NULL) {
5503                         goto done;
5504                 }
5505                 if (m0->m_len < sizeof(struct ip)) {
5506                         DPFPRINTF(PF_DEBUG_URGENT,
5507                             ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5508                         goto bad;
5509                 }
5510                 ip = mtod(m0, struct ip *);
5511         }
5512
5513         /* Copied from FreeBSD 5.1-CURRENT ip_output. */
5514         m0->m_pkthdr.csum_flags |= CSUM_IP;
5515         sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
5516         if (sw_csum & CSUM_DELAY_DATA) {
5517                 in_delayed_cksum(m0);
5518                 sw_csum &= ~CSUM_DELAY_DATA;
5519         }
5520         m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
5521
5522         if (ip->ip_len <= ifp->if_mtu ||
5523             (ifp->if_hwassist & CSUM_FRAGMENT &&
5524                 (ip->ip_off & IP_DF) == 0)) {
5525                 ip->ip_len = htons(ip->ip_len);
5526                 ip->ip_off = htons(ip->ip_off);
5527                 ip->ip_sum = 0;
5528                 if (sw_csum & CSUM_DELAY_IP) {
5529                         /* From KAME */
5530                         if (ip->ip_v == IPVERSION &&
5531                             (ip->ip_hl << 2) == sizeof(*ip)) {
5532                                 ip->ip_sum = in_cksum_hdr(ip);
5533                         } else {
5534                                 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5535                         }
5536                 }
5537                 lwkt_reltoken(&pf_token);
5538                 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt);
5539                 lwkt_gettoken(&pf_token);
5540                 goto done;
5541         }
5542
5543         /*
5544          * Too large for interface; fragment if possible.
5545          * Must be able to put at least 8 bytes per fragment.
5546          */
5547         if (ip->ip_off & IP_DF) {
5548                 ipstat.ips_cantfrag++;
5549                 if (r->rt != PF_DUPTO) {
5550                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5551                             ifp->if_mtu);
5552                         goto done;
5553                 } else
5554                         goto bad;
5555         }
5556
5557         m1 = m0;
5558         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5559         if (error) {
5560                 goto bad;
5561         }
5562
5563         for (m0 = m1; m0; m0 = m1) {
5564                 m1 = m0->m_nextpkt;
5565                 m0->m_nextpkt = 0;
5566                 if (error == 0) {
5567                         lwkt_reltoken(&pf_token);
5568                         error = (*ifp->if_output)(ifp, m0, sintosa(dst),
5569                                                   NULL);
5570                         lwkt_gettoken(&pf_token);
5571                 } else
5572                         m_freem(m0);
5573         }
5574
5575         if (error == 0)
5576                 ipstat.ips_fragmented++;
5577
5578 done:
5579         if (r->rt != PF_DUPTO)
5580                 *m = NULL;
5581         if (ro == &iproute && ro->ro_rt)
5582                 RTFREE(ro->ro_rt);
5583         return;
5584
5585 bad:
5586         m_freem(m0);
5587         goto done;
5588 }
5589 #endif /* INET */
5590
5591 #ifdef INET6
5592 void
5593 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5594     struct pf_state *s, struct pf_pdesc *pd)
5595 {
5596         struct mbuf             *m0;
5597         struct route_in6         ip6route;
5598         struct route_in6        *ro;
5599         struct sockaddr_in6     *dst;
5600         struct ip6_hdr          *ip6;
5601         struct ifnet            *ifp = NULL;
5602         struct pf_addr           naddr;
5603         struct pf_src_node      *sn = NULL;
5604         int                      error = 0;
5605
5606         if (m == NULL || *m == NULL || r == NULL ||
5607             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5608                 panic("pf_route6: invalid parameters");
5609
5610         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5611                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5612                 (*m)->m_pkthdr.pf.routed = 1;
5613         } else {
5614                 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5615                         m0 = *m;
5616                         *m = NULL;
5617                         goto bad;
5618                 }
5619         }
5620
5621         if (r->rt == PF_DUPTO) {
5622                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5623                         return;
5624         } else {
5625                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5626                         return;
5627                 m0 = *m;
5628         }
5629
5630         if (m0->m_len < sizeof(struct ip6_hdr)) {
5631                 DPFPRINTF(PF_DEBUG_URGENT,
5632                     ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5633                 goto bad;
5634         }
5635         ip6 = mtod(m0, struct ip6_hdr *);
5636
5637         ro = &ip6route;
5638         bzero((caddr_t)ro, sizeof(*ro));
5639         dst = (struct sockaddr_in6 *)&ro->ro_dst;
5640         dst->sin6_family = AF_INET6;
5641         dst->sin6_len = sizeof(*dst);
5642         dst->sin6_addr = ip6->ip6_dst;
5643
5644         /*
5645          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
5646          * so make sure pf.flags is clear.
5647          *
5648          * Cheat. XXX why only in the v6 case???
5649          */
5650         if (r->rt == PF_FASTROUTE) {
5651                 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
5652                 m0->m_pkthdr.pf.flags = 0;
5653                 /* XXX Re-Check when Upgrading to > 4.4 */
5654                 m0->m_pkthdr.pf.statekey = NULL;
5655                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5656                 return;
5657         }
5658
5659         if (TAILQ_EMPTY(&r->rpool.list)) {
5660                 DPFPRINTF(PF_DEBUG_URGENT,
5661                     ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
5662                 goto bad;
5663         }
5664         if (s == NULL) {
5665                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5666                     &naddr, NULL, &sn);
5667                 if (!PF_AZERO(&naddr, AF_INET6))
5668                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5669                             &naddr, AF_INET6);
5670                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5671         } else {
5672                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5673                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5674                             &s->rt_addr, AF_INET6);
5675                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5676         }
5677         if (ifp == NULL)
5678                 goto bad;
5679
5680         if (oifp != ifp) {
5681                 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5682                         goto bad;
5683                 } else if (m0 == NULL) {
5684                         goto done;
5685                 }
5686                 if (m0->m_len < sizeof(struct ip6_hdr)) {
5687                         DPFPRINTF(PF_DEBUG_URGENT,
5688                             ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5689                         goto bad;
5690                 }
5691                 ip6 = mtod(m0, struct ip6_hdr *);
5692         }
5693
5694         /*
5695          * If the packet is too large for the outgoing interface,
5696          * send back an icmp6 error.
5697          */
5698         if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5699                 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5700         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5701                 error = nd6_output(ifp, ifp, m0, dst, NULL);
5702         } else {
5703                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5704                 if (r->rt != PF_DUPTO)
5705                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5706                 else
5707                         goto bad;
5708         }
5709
5710 done:
5711         if (r->rt != PF_DUPTO)
5712                 *m = NULL;
5713         return;
5714
5715 bad:
5716         m_freem(m0);
5717         goto done;
5718 }
5719 #endif /* INET6 */
5720
5721
5722 /*
5723  * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5724  *   off is the offset where the protocol header starts
5725  *   len is the total length of protocol header plus payload
5726  * returns 0 when the checksum is valid, otherwise returns 1.
5727  */
5728 /*
5729  * XXX
5730  * FreeBSD supports cksum offload for the following drivers.
5731  * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5732  * If we can make full use of it we would outperform ipfw/ipfilter in
5733  * very heavy traffic.
5734  * I have not tested 'cause I don't have NICs that supports cksum offload.
5735  * (There might be problems. Typical phenomena would be
5736  *   1. No route message for UDP packet.
5737  *   2. No connection acceptance from external hosts regardless of rule set.)
5738  */
5739 int
5740 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5741     sa_family_t af)
5742 {
5743         u_int16_t sum = 0;
5744         int hw_assist = 0;
5745         struct ip *ip;
5746
5747         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5748                 return (1);
5749         if (m->m_pkthdr.len < off + len)
5750                 return (1);
5751
5752         switch (p) {
5753         case IPPROTO_TCP:
5754         case IPPROTO_UDP:
5755                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5756                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5757                                 sum = m->m_pkthdr.csum_data;
5758                         } else {
5759                                 ip = mtod(m, struct ip *);
5760                                 sum = in_pseudo(ip->ip_src.s_addr,
5761                                         ip->ip_dst.s_addr, htonl((u_short)len +
5762                                         m->m_pkthdr.csum_data + p));
5763                         }
5764                         sum ^= 0xffff;
5765                         ++hw_assist;
5766                 }
5767                 break;
5768         case IPPROTO_ICMP:
5769 #ifdef INET6
5770         case IPPROTO_ICMPV6:
5771 #endif /* INET6 */
5772                 break;
5773         default:
5774                 return (1);
5775         }
5776
5777         if (!hw_assist) {
5778                 switch (af) {
5779                 case AF_INET:
5780                         if (p == IPPROTO_ICMP) {
5781                                 if (m->m_len < off)
5782                                         return (1);
5783                                 m->m_data += off;
5784                                 m->m_len -= off;
5785                                 sum = in_cksum(m, len);
5786                                 m->m_data -= off;
5787                                 m->m_len += off;
5788                         } else {
5789                                 if (m->m_len < sizeof(struct ip))
5790                                         return (1);
5791                                 sum = in_cksum_range(m, p, off, len);
5792                                 if (sum == 0) {
5793                                         m->m_pkthdr.csum_flags |=
5794                                             (CSUM_DATA_VALID |
5795                                              CSUM_PSEUDO_HDR);
5796                                         m->m_pkthdr.csum_data = 0xffff;
5797                                 }
5798                         }
5799                         break;
5800 #ifdef INET6
5801                 case AF_INET6:
5802                         if (m->m_len < sizeof(struct ip6_hdr))
5803                                 return (1);
5804                         sum = in6_cksum(m, p, off, len);
5805                         /*
5806                          * XXX
5807                          * IPv6 H/W cksum off-load not supported yet!
5808                          *
5809                          * if (sum == 0) {
5810                          *      m->m_pkthdr.csum_flags |=
5811                          *          (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5812                          *      m->m_pkthdr.csum_data = 0xffff;
5813                          *}
5814                          */
5815                         break;
5816 #endif /* INET6 */
5817                 default:
5818                         return (1);
5819                 }
5820         }
5821         if (sum) {
5822                 switch (p) {
5823                 case IPPROTO_TCP:
5824                         tcpstat.tcps_rcvbadsum++;
5825                         break;
5826                 case IPPROTO_UDP:
5827                         udpstat.udps_badsum++;
5828                         break;
5829                 case IPPROTO_ICMP:
5830                         icmpstat.icps_checksum++;
5831                         break;
5832 #ifdef INET6
5833                 case IPPROTO_ICMPV6:
5834                         icmp6stat.icp6s_checksum++;
5835                         break;
5836 #endif /* INET6 */
5837                 }
5838                 return (1);
5839         }
5840         return (0);
5841 }
5842
5843 struct pf_divert *
5844 pf_find_divert(struct mbuf *m)
5845 {
5846         struct m_tag    *mtag;
5847
5848         if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL)
5849                 return (NULL);
5850
5851         return ((struct pf_divert *)(mtag + 1));
5852 }
5853
5854 struct pf_divert *
5855 pf_get_divert(struct mbuf *m)
5856 {
5857         struct m_tag    *mtag;
5858
5859         if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) {
5860                 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert),
5861                     M_NOWAIT);
5862                 if (mtag == NULL)
5863                         return (NULL);
5864                 bzero(mtag + 1, sizeof(struct pf_divert));
5865                 m_tag_prepend(m, mtag);
5866         }
5867
5868         return ((struct pf_divert *)(mtag + 1));
5869 }
5870
5871 #ifdef INET
5872 int
5873 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
5874     struct ether_header *eh, struct inpcb *inp)
5875 {
5876         struct pfi_kif          *kif;
5877         u_short                  action, reason = 0, log = 0;
5878         struct mbuf             *m = *m0;
5879         struct ip               *h = NULL;
5880         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5881         struct pf_state         *s = NULL;
5882         struct pf_ruleset       *ruleset = NULL;
5883         struct pf_pdesc          pd;
5884         int                      off, dirndx, pqid = 0;
5885
5886         if (!pf_status.running)
5887                 return (PF_PASS);
5888
5889         memset(&pd, 0, sizeof(pd));
5890         if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
5891                 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
5892         else
5893                 kif = (struct pfi_kif *)ifp->if_pf_kif;
5894
5895         if (kif == NULL) {
5896                 DPFPRINTF(PF_DEBUG_URGENT,
5897                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5898                 return (PF_DROP);
5899         }
5900         if (kif->pfik_flags & PFI_IFLAG_SKIP)
5901                 return (PF_PASS);
5902
5903 #ifdef DIAGNOSTIC
5904         if ((m->m_flags & M_PKTHDR) == 0)
5905                 panic("non-M_PKTHDR is passed to pf_test");
5906 #endif /* DIAGNOSTIC */
5907
5908         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5909                 action = PF_DROP;
5910                 REASON_SET(&reason, PFRES_SHORT);
5911                 log = 1;
5912                 goto done;
5913         }
5914
5915         /*
5916          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
5917          * so make sure pf.flags is clear.
5918          */
5919         if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
5920                 return (PF_PASS);
5921         m->m_pkthdr.pf.flags = 0;
5922         /* Re-Check when updating to > 4.4 */
5923         m->m_pkthdr.pf.statekey = NULL;
5924
5925         /* We do IP header normalization and packet reassembly here */
5926         if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5927                 action = PF_DROP;
5928                 goto done;
5929         }
5930         m = *m0;        /* pf_normalize messes with m0 */
5931         h = mtod(m, struct ip *);
5932
5933         off = h->ip_hl << 2;
5934         if (off < (int)sizeof(*h)) {
5935                 action = PF_DROP;
5936                 REASON_SET(&reason, PFRES_SHORT);
5937                 log = 1;
5938                 goto done;
5939         }
5940
5941         pd.src = (struct pf_addr *)&h->ip_src;
5942         pd.dst = (struct pf_addr *)&h->ip_dst;
5943         pd.sport = pd.dport = NULL;
5944         pd.ip_sum = &h->ip_sum;
5945         pd.proto_sum = NULL;
5946         pd.proto = h->ip_p;
5947         pd.dir = dir;
5948         pd.sidx = (dir == PF_IN) ? 0 : 1;
5949         pd.didx = (dir == PF_IN) ? 1 : 0;
5950         pd.af = AF_INET;
5951         pd.tos = h->ip_tos;
5952         pd.tot_len = h->ip_len;
5953         pd.eh = eh;
5954
5955         /* handle fragments that didn't get reassembled by normalization */
5956         if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5957                 action = pf_test_fragment(&r, dir, kif, m, h,
5958                     &pd, &a, &ruleset);
5959                 goto done;
5960         }
5961
5962         switch (h->ip_p) {
5963
5964         case IPPROTO_TCP: {
5965                 struct tcphdr   th;
5966
5967                 pd.hdr.tcp = &th;
5968                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5969                     &action, &reason, AF_INET)) {
5970                         log = action != PF_PASS;
5971                         goto done;
5972                 }
5973                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5974                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5975                         pqid = 1;
5976                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5977                 if (action == PF_DROP)
5978                         goto done;
5979                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5980                     &reason);
5981                 if (action == PF_PASS) {
5982                         pfsync_update_state(s);
5983                         r = s->rule.ptr;
5984                         a = s->anchor.ptr;
5985                         log = s->log;
5986                 } else if (s == NULL)
5987                         action = pf_test_rule(&r, &s, dir, kif,
5988                             m, off, h, &pd, &a, &ruleset, NULL, inp);
5989                 break;
5990         }
5991
5992         case IPPROTO_UDP: {
5993                 struct udphdr   uh;
5994
5995                 pd.hdr.udp = &uh;
5996                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5997                     &action, &reason, AF_INET)) {
5998                         log = action != PF_PASS;
5999                         goto done;
6000                 }
6001                 if (uh.uh_dport == 0 ||
6002                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6003                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6004                         action = PF_DROP;
6005                         REASON_SET(&reason, PFRES_SHORT);
6006                         goto done;
6007                 }
6008                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6009                 if (action == PF_PASS) {
6010                         pfsync_update_state(s);
6011                         r = s->rule.ptr;
6012                         a = s->anchor.ptr;
6013                         log = s->log;
6014                 } else if (s == NULL)
6015                         action = pf_test_rule(&r, &s, dir, kif,
6016                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6017                 break;
6018         }
6019
6020         case IPPROTO_ICMP: {
6021                 struct icmp     ih;
6022
6023                 pd.hdr.icmp = &ih;
6024                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
6025                     &action, &reason, AF_INET)) {
6026                         log = action != PF_PASS;
6027                         goto done;
6028                 }
6029                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
6030                     &reason);
6031                 if (action == PF_PASS) {
6032                         pfsync_update_state(s);
6033                         r = s->rule.ptr;
6034                         a = s->anchor.ptr;
6035                         log = s->log;
6036                 } else if (s == NULL)
6037                         action = pf_test_rule(&r, &s, dir, kif,
6038                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6039                 break;
6040         }
6041
6042         default:
6043                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6044                 if (action == PF_PASS) {
6045                         pfsync_update_state(s);
6046                         r = s->rule.ptr;
6047                         a = s->anchor.ptr;
6048                         log = s->log;
6049                 } else if (s == NULL)
6050                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6051                             &pd, &a, &ruleset, NULL, inp);
6052                 break;
6053         }
6054
6055 done:
6056         if (action == PF_PASS && h->ip_hl > 5 &&
6057             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6058                 action = PF_DROP;
6059                 REASON_SET(&reason, PFRES_IPOPTIONS);
6060                 log = 1;
6061                 DPFPRINTF(PF_DEBUG_MISC,
6062                     ("pf: dropping packet with ip options\n"));
6063         }
6064
6065         if ((s && s->tag) || r->rtableid)
6066                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6067
6068 #if 0
6069         if (dir == PF_IN && s && s->key[PF_SK_STACK])
6070                 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
6071 #endif
6072
6073 #ifdef ALTQ
6074         if (action == PF_PASS && r->qid) {
6075                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
6076                 if (pqid || (pd.tos & IPTOS_LOWDELAY))
6077                         m->m_pkthdr.pf.qid = r->pqid;
6078                 else
6079                         m->m_pkthdr.pf.qid = r->qid;
6080                 m->m_pkthdr.pf.ecn_af = AF_INET;
6081                 m->m_pkthdr.pf.hdr = h;
6082                 /* add connection hash for fairq */
6083                 if (s) {
6084                         /* for fairq */
6085                         m->m_pkthdr.pf.state_hash = s->hash;
6086                         m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
6087                 }
6088         }
6089 #endif /* ALTQ */
6090
6091         /*
6092          * connections redirected to loopback should not match sockets
6093          * bound specifically to loopback due to security implications,
6094          * see tcp_input() and in_pcblookup_listen().
6095          */
6096         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6097             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6098             (s->nat_rule.ptr->action == PF_RDR ||
6099             s->nat_rule.ptr->action == PF_BINAT) &&
6100             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
6101                 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
6102
6103         if (dir == PF_IN && action == PF_PASS && r->divert.port) {
6104                 struct pf_divert *divert;
6105
6106                 if ((divert = pf_get_divert(m))) {
6107                         m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
6108                         divert->port = r->divert.port;
6109                         divert->addr.ipv4 = r->divert.addr.v4;
6110                 }
6111         }
6112
6113         if (log) {
6114                 struct pf_rule *lr;
6115
6116                 if (s != NULL && s->nat_rule.ptr != NULL &&
6117                     s->nat_rule.ptr->log & PF_LOG_ALL)
6118                         lr = s->nat_rule.ptr;
6119                 else
6120                         lr = r;
6121                 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset,
6122                     &pd);
6123         }
6124
6125         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6126         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6127
6128         if (action == PF_PASS || r->action == PF_DROP) {
6129                 dirndx = (dir == PF_OUT);
6130                 r->packets[dirndx]++;
6131                 r->bytes[dirndx] += pd.tot_len;
6132                 if (a != NULL) {
6133                         a->packets[dirndx]++;
6134                         a->bytes[dirndx] += pd.tot_len;
6135                 }
6136                 if (s != NULL) {
6137                         if (s->nat_rule.ptr != NULL) {
6138                                 s->nat_rule.ptr->packets[dirndx]++;
6139                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6140                         }
6141                         if (s->src_node != NULL) {
6142                                 s->src_node->packets[dirndx]++;
6143                                 s->src_node->bytes[dirndx] += pd.tot_len;
6144                         }
6145                         if (s->nat_src_node != NULL) {
6146                                 s->nat_src_node->packets[dirndx]++;
6147                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6148                         }
6149                         dirndx = (dir == s->direction) ? 0 : 1;
6150                         s->packets[dirndx]++;
6151                         s->bytes[dirndx] += pd.tot_len;
6152                 }
6153                 tr = r;
6154                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6155                 if (nr != NULL && r == &pf_default_rule)
6156                         tr = nr;
6157                 if (tr->src.addr.type == PF_ADDR_TABLE)
6158                         pfr_update_stats(tr->src.addr.p.tbl,
6159                             (s == NULL) ? pd.src :
6160                             &s->key[(s->direction == PF_IN)]->
6161                                 addr[(s->direction == PF_OUT)],
6162                             pd.af, pd.tot_len, dir == PF_OUT,
6163                             r->action == PF_PASS, tr->src.neg);
6164                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6165                         pfr_update_stats(tr->dst.addr.p.tbl,
6166                             (s == NULL) ? pd.dst :
6167                             &s->key[(s->direction == PF_IN)]->
6168                                 addr[(s->direction == PF_IN)],
6169                             pd.af, pd.tot_len, dir == PF_OUT,
6170                             r->action == PF_PASS, tr->dst.neg);
6171         }
6172
6173
6174         if (action == PF_SYNPROXY_DROP) {
6175                 m_freem(*m0);
6176                 *m0 = NULL;
6177                 action = PF_PASS;
6178         } else if (r->rt)
6179                 /* pf_route can free the mbuf causing *m0 to become NULL */
6180                 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
6181
6182         return (action);
6183 }
6184 #endif /* INET */
6185
6186 #ifdef INET6
6187 int
6188 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
6189     struct ether_header *eh, struct inpcb *inp)
6190 {
6191         struct pfi_kif          *kif;
6192         u_short                  action, reason = 0, log = 0;
6193         struct mbuf             *m = *m0, *n = NULL;
6194         struct ip6_hdr          *h = NULL;
6195         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
6196         struct pf_state         *s = NULL;
6197         struct pf_ruleset       *ruleset = NULL;
6198         struct pf_pdesc          pd;
6199         int                      off, terminal = 0, dirndx, rh_cnt = 0;
6200
6201         if (!pf_status.running)
6202                 return (PF_PASS);
6203
6204         memset(&pd, 0, sizeof(pd));
6205         if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
6206                 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
6207         else
6208                 kif = (struct pfi_kif *)ifp->if_pf_kif;
6209
6210         if (kif == NULL) {
6211                 DPFPRINTF(PF_DEBUG_URGENT,
6212                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6213                 return (PF_DROP);
6214         }
6215         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6216                 return (PF_PASS);
6217
6218 #ifdef DIAGNOSTIC
6219         if ((m->m_flags & M_PKTHDR) == 0)
6220                 panic("non-M_PKTHDR is passed to pf_test6");
6221 #endif /* DIAGNOSTIC */
6222
6223         if (m->m_pkthdr.len < (int)sizeof(*h)) {
6224                 action = PF_DROP;
6225                 REASON_SET(&reason, PFRES_SHORT);
6226                 log = 1;
6227                 goto done;
6228         }
6229
6230         /*
6231          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
6232          * so make sure pf.flags is clear.
6233          */
6234         if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
6235                 return (PF_PASS);
6236         m->m_pkthdr.pf.flags = 0;
6237         /* Re-Check when updating to > 4.4 */
6238         m->m_pkthdr.pf.statekey = NULL;
6239
6240         /* We do IP header normalization and packet reassembly here */
6241         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6242                 action = PF_DROP;
6243                 goto done;
6244         }
6245         m = *m0;        /* pf_normalize messes with m0 */
6246         h = mtod(m, struct ip6_hdr *);
6247
6248 #if 1
6249         /*
6250          * we do not support jumbogram yet.  if we keep going, zero ip6_plen
6251          * will do something bad, so drop the packet for now.
6252          */
6253         if (htons(h->ip6_plen) == 0) {
6254                 action = PF_DROP;
6255                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
6256                 goto done;
6257         }
6258 #endif
6259
6260         pd.src = (struct pf_addr *)&h->ip6_src;
6261         pd.dst = (struct pf_addr *)&h->ip6_dst;
6262         pd.sport = pd.dport = NULL;
6263         pd.ip_sum = NULL;
6264         pd.proto_sum = NULL;
6265         pd.dir = dir;
6266         pd.sidx = (dir == PF_IN) ? 0 : 1;
6267         pd.didx = (dir == PF_IN) ? 1 : 0;
6268         pd.af = AF_INET6;
6269         pd.tos = 0;
6270         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6271         pd.eh = eh;
6272
6273         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6274         pd.proto = h->ip6_nxt;
6275         do {
6276                 switch (pd.proto) {
6277                 case IPPROTO_FRAGMENT:
6278                         action = pf_test_fragment(&r, dir, kif, m, h,
6279                             &pd, &a, &ruleset);
6280                         if (action == PF_DROP)
6281                                 REASON_SET(&reason, PFRES_FRAG);
6282                         goto done;
6283                 case IPPROTO_ROUTING: {
6284                         struct ip6_rthdr rthdr;
6285
6286                         if (rh_cnt++) {
6287                                 DPFPRINTF(PF_DEBUG_MISC,
6288                                     ("pf: IPv6 more than one rthdr\n"));
6289                                 action = PF_DROP;
6290                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6291                                 log = 1;
6292                                 goto done;
6293                         }
6294                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6295                             &reason, pd.af)) {
6296                                 DPFPRINTF(PF_DEBUG_MISC,
6297                                     ("pf: IPv6 short rthdr\n"));
6298                                 action = PF_DROP;
6299                                 REASON_SET(&reason, PFRES_SHORT);
6300                                 log = 1;
6301                                 goto done;
6302                         }
6303                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6304                                 DPFPRINTF(PF_DEBUG_MISC,
6305                                     ("pf: IPv6 rthdr0\n"));
6306                                 action = PF_DROP;
6307                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6308                                 log = 1;
6309                                 goto done;
6310                         }
6311                         /* FALLTHROUGH */
6312                 }
6313                 case IPPROTO_AH:
6314                 case IPPROTO_HOPOPTS:
6315                 case IPPROTO_DSTOPTS: {
6316                         /* get next header and header length */
6317                         struct ip6_ext  opt6;
6318
6319                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6320                             NULL, &reason, pd.af)) {
6321                                 DPFPRINTF(PF_DEBUG_MISC,
6322                                     ("pf: IPv6 short opt\n"));
6323                                 action = PF_DROP;
6324                                 log = 1;
6325                                 goto done;
6326                         }
6327                         if (pd.proto == IPPROTO_AH)
6328                                 off += (opt6.ip6e_len + 2) * 4;
6329                         else
6330                                 off += (opt6.ip6e_len + 1) * 8;
6331                         pd.proto = opt6.ip6e_nxt;
6332                         /* goto the next header */
6333                         break;
6334                 }
6335                 default:
6336                         terminal++;
6337                         break;
6338                 }
6339         } while (!terminal);
6340
6341         /* if there's no routing header, use unmodified mbuf for checksumming */
6342         if (!n)
6343                 n = m;
6344
6345         switch (pd.proto) {
6346
6347         case IPPROTO_TCP: {
6348                 struct tcphdr   th;
6349
6350                 pd.hdr.tcp = &th;
6351                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6352                     &action, &reason, AF_INET6)) {
6353                         log = action != PF_PASS;
6354                         goto done;
6355                 }
6356                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6357                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6358                 if (action == PF_DROP)
6359                         goto done;
6360                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6361                     &reason);
6362                 if (action == PF_PASS) {
6363                         pfsync_update_state(s);
6364                         r = s->rule.ptr;
6365                         a = s->anchor.ptr;
6366                         log = s->log;
6367                 } else if (s == NULL)
6368                         action = pf_test_rule(&r, &s, dir, kif,
6369                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6370                 break;
6371         }
6372
6373         case IPPROTO_UDP: {
6374                 struct udphdr   uh;
6375
6376                 pd.hdr.udp = &uh;
6377                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6378                     &action, &reason, AF_INET6)) {
6379                         log = action != PF_PASS;
6380                         goto done;
6381                 }
6382                 if (uh.uh_dport == 0 ||
6383                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6384                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6385                         action = PF_DROP;
6386                         REASON_SET(&reason, PFRES_SHORT);
6387                         goto done;
6388                 }
6389                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6390                 if (action == PF_PASS) {
6391                         pfsync_update_state(s);
6392                         r = s->rule.ptr;
6393                         a = s->anchor.ptr;
6394                         log = s->log;
6395                 } else if (s == NULL)
6396                         action = pf_test_rule(&r, &s, dir, kif,
6397                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6398                 break;
6399         }
6400
6401         case IPPROTO_ICMPV6: {
6402                 struct icmp6_hdr        ih;
6403
6404                 pd.hdr.icmp6 = &ih;
6405                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6406                     &action, &reason, AF_INET6)) {
6407                         log = action != PF_PASS;
6408                         goto done;
6409                 }
6410                 action = pf_test_state_icmp(&s, dir, kif,
6411                     m, off, h, &pd, &reason);
6412                 if (action == PF_PASS) {
6413                         pfsync_update_state(s);
6414                         r = s->rule.ptr;
6415                         a = s->anchor.ptr;
6416                         log = s->log;
6417                 } else if (s == NULL)
6418                         action = pf_test_rule(&r, &s, dir, kif,
6419                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6420                 break;
6421         }
6422
6423         default:
6424                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6425                 if (action == PF_PASS) {
6426                         pfsync_update_state(s);
6427                         r = s->rule.ptr;
6428                         a = s->anchor.ptr;
6429                         log = s->log;
6430                 } else if (s == NULL)
6431                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6432                             &pd, &a, &ruleset, NULL, inp);
6433                 break;
6434         }
6435
6436 done:
6437         if (n != m) {
6438                 m_freem(n);
6439                 n = NULL;
6440         }
6441
6442         /* handle dangerous IPv6 extension headers. */
6443         if (action == PF_PASS && rh_cnt &&
6444             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6445                 action = PF_DROP;
6446                 REASON_SET(&reason, PFRES_IPOPTIONS);
6447                 log = 1;
6448                 DPFPRINTF(PF_DEBUG_MISC,
6449                     ("pf: dropping packet with dangerous v6 headers\n"));
6450         }
6451
6452         if ((s && s->tag) || r->rtableid)
6453                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6454
6455 #if 0
6456         if (dir == PF_IN && s && s->key[PF_SK_STACK])
6457                 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
6458 #endif
6459
6460 #ifdef ALTQ
6461         if (action == PF_PASS && r->qid) {
6462                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
6463                 if (pd.tos & IPTOS_LOWDELAY)
6464                         m->m_pkthdr.pf.qid = r->pqid;
6465                 else
6466                         m->m_pkthdr.pf.qid = r->qid;
6467                 m->m_pkthdr.pf.ecn_af = AF_INET6;
6468                 m->m_pkthdr.pf.hdr = h;
6469                 if (s) {
6470                         /* for fairq */
6471                         m->m_pkthdr.pf.state_hash = s->hash;
6472                         m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
6473                 }
6474         }
6475 #endif /* ALTQ */
6476
6477         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6478             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6479             (s->nat_rule.ptr->action == PF_RDR ||
6480             s->nat_rule.ptr->action == PF_BINAT) &&
6481             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6482                 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
6483
6484         if (dir == PF_IN && action == PF_PASS && r->divert.port) {
6485                 struct pf_divert *divert;
6486
6487                 if ((divert = pf_get_divert(m))) {
6488                         m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
6489                         divert->port = r->divert.port;
6490                         divert->addr.ipv6 = r->divert.addr.v6;
6491                 }
6492         }
6493
6494         if (log) {
6495                 struct pf_rule *lr;
6496
6497                 if (s != NULL && s->nat_rule.ptr != NULL &&
6498                     s->nat_rule.ptr->log & PF_LOG_ALL)
6499                         lr = s->nat_rule.ptr;
6500                 else
6501                         lr = r;
6502                 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset,
6503                     &pd);
6504         }
6505
6506         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6507         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6508
6509         if (action == PF_PASS || r->action == PF_DROP) {
6510                 dirndx = (dir == PF_OUT);
6511                 r->packets[dirndx]++;
6512                 r->bytes[dirndx] += pd.tot_len;
6513                 if (a != NULL) {
6514                         a->packets[dirndx]++;
6515                         a->bytes[dirndx] += pd.tot_len;
6516                 }
6517                 if (s != NULL) {
6518                         if (s->nat_rule.ptr != NULL) {
6519                                 s->nat_rule.ptr->packets[dirndx]++;
6520                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6521                         }
6522                         if (s->src_node != NULL) {
6523                                 s->src_node->packets[dirndx]++;
6524                                 s->src_node->bytes[dirndx] += pd.tot_len;
6525                         }
6526                         if (s->nat_src_node != NULL) {
6527                                 s->nat_src_node->packets[dirndx]++;
6528                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6529                         }
6530                         dirndx = (dir == s->direction) ? 0 : 1;
6531                         s->packets[dirndx]++;
6532                         s->bytes[dirndx] += pd.tot_len;
6533                 }
6534                 tr = r;
6535                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6536                 if (nr != NULL && r == &pf_default_rule)
6537                         tr = nr;
6538                 if (tr->src.addr.type == PF_ADDR_TABLE)
6539                         pfr_update_stats(tr->src.addr.p.tbl,
6540                             (s == NULL) ? pd.src :
6541                             &s->key[(s->direction == PF_IN)]->addr[0],
6542                             pd.af, pd.tot_len, dir == PF_OUT,
6543                             r->action == PF_PASS, tr->src.neg);
6544                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6545                         pfr_update_stats(tr->dst.addr.p.tbl,
6546                             (s == NULL) ? pd.dst :
6547                             &s->key[(s->direction == PF_IN)]->addr[1],
6548                             pd.af, pd.tot_len, dir == PF_OUT,
6549                             r->action == PF_PASS, tr->dst.neg);
6550         }
6551
6552
6553         if (action == PF_SYNPROXY_DROP) {
6554                 m_freem(*m0);
6555                 *m0 = NULL;
6556                 action = PF_PASS;
6557         } else if (r->rt)
6558                 /* pf_route6 can free the mbuf causing *m0 to become NULL */
6559                 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
6560
6561         return (action);
6562 }
6563 #endif /* INET6 */
6564
6565 int
6566 pf_check_congestion(struct ifqueue *ifq)
6567 {
6568                 return (0);
6569 }