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 <sys/proc.h>
  55 #include <sys/kthread.h>
  56
  57 #include <machine/inttypes.h>
  58
  59 #include <sys/md5.h>
  60
  61 #include <net/if.h>
  62 #include <net/if_types.h>
  63 #include <net/bpf.h>
  64 #include <net/netisr.h>
  65 #include <net/route.h>
  66
  67 #include <netinet/in.h>
  68 #include <netinet/in_var.h>
  69 #include <netinet/in_systm.h>
  70 #include <netinet/ip.h>
  71 #include <netinet/ip_var.h>
  72 #include <netinet/tcp.h>
  73 #include <netinet/tcp_seq.h>
  74 #include <netinet/udp.h>
  75 #include <netinet/ip_icmp.h>
  76 #include <netinet/in_pcb.h>
  77 #include <netinet/tcp_timer.h>
  78 #include <netinet/tcp_var.h>
  79 #include <netinet/udp_var.h>
  80 #include <netinet/icmp_var.h>
  81 #include <netinet/if_ether.h>
  82
  83 #include <net/pf/pfvar.h>
  84 #include <net/pf/if_pflog.h>
  85
  86 #include <net/pf/if_pfsync.h>
  87
  88 #ifdef INET6
  89 #include <netinet/ip6.h>
  90 #include <netinet/in_pcb.h>
  91 #include <netinet/icmp6.h>
  92 #include <netinet6/nd6.h>
  93 #include <netinet6/ip6_var.h>
  94 #include <netinet6/in6_pcb.h>
  95 #endif /* INET6 */
  96
  97 #include <sys/in_cksum.h>
  98 #include <sys/ucred.h>
  99 #include <machine/limits.h>
 100 #include <sys/msgport2.h>
 101 #include <net/netmsg2.h>
 102
 103 extern int ip_optcopy(struct ip *, struct ip *);
 104 extern int debug_pfugidhack;
 105
 106 struct lwkt_token pf_token = LWKT_TOKEN_INITIALIZER(pf_token);
 107
 108 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
 109
 110 /*
 111  * Global variables
 112  */
 113
 114 /* mask radix tree */
 115 struct radix_node_head  *pf_maskhead;
 116
 117 /* state tables */
 118 struct pf_state_tree     pf_statetbl;
 119
 120 struct pf_altqqueue      pf_altqs[2];
 121 struct pf_palist         pf_pabuf;
 122 struct pf_altqqueue     *pf_altqs_active;
 123 struct pf_altqqueue     *pf_altqs_inactive;
 124 struct pf_status         pf_status;
 125
 126 u_int32_t                ticket_altqs_active;
 127 u_int32_t                ticket_altqs_inactive;
 128 int                      altqs_inactive_open;
 129 u_int32_t                ticket_pabuf;
 130
 131 MD5_CTX                  pf_tcp_secret_ctx;
 132 u_char                   pf_tcp_secret[16];
 133 int                      pf_tcp_secret_init;
 134 int                      pf_tcp_iss_off;
 135
 136 struct pf_anchor_stackframe {
 137         struct pf_ruleset                       *rs;
 138         struct pf_rule                          *r;
 139         struct pf_anchor_node                   *parent;
 140         struct pf_anchor                        *child;
 141 } pf_anchor_stack[64];
 142
 143 struct malloc_type       *pf_src_tree_pl, *pf_rule_pl, *pf_pooladdr_pl;
 144 struct malloc_type       *pf_state_pl, *pf_state_key_pl, *pf_state_item_pl;
 145 struct malloc_type       *pf_altq_pl;
 146
 147 void                     pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
 148
 149 void                     pf_init_threshold(struct pf_threshold *, u_int32_t,
 150                             u_int32_t);
 151 void                     pf_add_threshold(struct pf_threshold *);
 152 int                      pf_check_threshold(struct pf_threshold *);
 153
 154 void                     pf_change_ap(struct pf_addr *, u_int16_t *,
 155                             u_int16_t *, u_int16_t *, struct pf_addr *,
 156                             u_int16_t, u_int8_t, sa_family_t);
 157 int                      pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
 158                             struct tcphdr *, struct pf_state_peer *);
 159 #ifdef INET6
 160 void                     pf_change_a6(struct pf_addr *, u_int16_t *,
 161                             struct pf_addr *, u_int8_t);
 162 #endif /* INET6 */
 163 void                     pf_change_icmp(struct pf_addr *, u_int16_t *,
 164                             struct pf_addr *, struct pf_addr *, u_int16_t,
 165                             u_int16_t *, u_int16_t *, u_int16_t *,
 166                             u_int16_t *, u_int8_t, sa_family_t);
 167 void                     pf_send_tcp(const struct pf_rule *, sa_family_t,
 168                             const struct pf_addr *, const struct pf_addr *,
 169                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 170                             u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
 171                             u_int16_t, struct ether_header *, struct ifnet *);
 172 void                     pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 173                             sa_family_t, struct pf_rule *);
 174 struct pf_rule          *pf_match_translation(struct pf_pdesc *, struct mbuf *,
 175                             int, int, struct pfi_kif *,
 176                             struct pf_addr *, u_int16_t, struct pf_addr *,
 177                             u_int16_t, int);
 178 struct pf_rule          *pf_get_translation(struct pf_pdesc *, struct mbuf *,
 179                             int, int, struct pfi_kif *, struct pf_src_node **,
 180                             struct pf_state_key **, struct pf_state_key **,
 181                             struct pf_state_key **, struct pf_state_key **,
 182                             struct pf_addr *, struct pf_addr *,
 183                             u_int16_t, u_int16_t);
 184 void                     pf_detach_state(struct pf_state *);
 185 int                      pf_state_key_setup(struct pf_pdesc *, struct pf_rule *,
 186                             struct pf_state_key **, struct pf_state_key **,
 187                             struct pf_state_key **, struct pf_state_key **,
 188                             struct pf_addr *, struct pf_addr *,
 189                             u_int16_t, u_int16_t);
 190 void                     pf_state_key_detach(struct pf_state *, int);
 191 u_int32_t                pf_tcp_iss(struct pf_pdesc *);
 192 int                      pf_test_rule(struct pf_rule **, struct pf_state **,
 193                             int, struct pfi_kif *, struct mbuf *, int,
 194                             void *, struct pf_pdesc *, struct pf_rule **,
 195                             struct pf_ruleset **, struct ifqueue *, struct inpcb *);
 196 static __inline int      pf_create_state(struct pf_rule *, struct pf_rule *,
 197                             struct pf_rule *, struct pf_pdesc *,
 198                             struct pf_src_node *, struct pf_state_key *,
 199                             struct pf_state_key *, struct pf_state_key *,
 200                             struct pf_state_key *, struct mbuf *, int,
 201                             u_int16_t, u_int16_t, int *, struct pfi_kif *,
 202                             struct pf_state **, int, u_int16_t, u_int16_t,
 203                             int);
 204 int                      pf_test_fragment(struct pf_rule **, int,
 205                             struct pfi_kif *, struct mbuf *, void *,
 206                             struct pf_pdesc *, struct pf_rule **,
 207                             struct pf_ruleset **);
 208 int                      pf_tcp_track_full(struct pf_state_peer *,
 209                             struct pf_state_peer *, struct pf_state **,
 210                             struct pfi_kif *, struct mbuf *, int,
 211                             struct pf_pdesc *, u_short *, int *);
 212 int                     pf_tcp_track_sloppy(struct pf_state_peer *,
 213                             struct pf_state_peer *, struct pf_state **,
 214                             struct pf_pdesc *, u_short *);
 215 int                      pf_test_state_tcp(struct pf_state **, int,
 216                             struct pfi_kif *, struct mbuf *, int,
 217                             void *, struct pf_pdesc *, u_short *);
 218 int                      pf_test_state_udp(struct pf_state **, int,
 219                             struct pfi_kif *, struct mbuf *, int,
 220                             void *, struct pf_pdesc *);
 221 int                      pf_test_state_icmp(struct pf_state **, int,
 222                             struct pfi_kif *, struct mbuf *, int,
 223                             void *, struct pf_pdesc *, u_short *);
 224 int                      pf_test_state_other(struct pf_state **, int,
 225                             struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
 226 void                     pf_step_into_anchor(int *, struct pf_ruleset **, int,
 227                             struct pf_rule **, struct pf_rule **, int *);
 228 int                      pf_step_out_of_anchor(int *, struct pf_ruleset **,
 229                              int, struct pf_rule **, struct pf_rule **,
 230                              int *);
 231 void                     pf_hash(struct pf_addr *, struct pf_addr *,
 232                             struct pf_poolhashkey *, sa_family_t);
 233 int                      pf_map_addr(u_int8_t, struct pf_rule *,
 234                             struct pf_addr *, struct pf_addr *,
 235                             struct pf_addr *, struct pf_src_node **);
 236 int                      pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
 237                             struct pf_addr *, struct pf_addr *, u_int16_t,
 238                             struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
 239                             struct pf_src_node **);
 240 void                     pf_route(struct mbuf **, struct pf_rule *, int,
 241                             struct ifnet *, struct pf_state *,
 242                             struct pf_pdesc *);
 243 void                     pf_route6(struct mbuf **, struct pf_rule *, int,
 244                             struct ifnet *, struct pf_state *,
 245                             struct pf_pdesc *);
 246 u_int8_t                 pf_get_wscale(struct mbuf *, int, u_int16_t,
 247                             sa_family_t);
 248 u_int16_t                pf_get_mss(struct mbuf *, int, u_int16_t,
 249                             sa_family_t);
 250 u_int16_t                pf_calc_mss(struct pf_addr *, sa_family_t,
 251                                 u_int16_t);
 252 void                     pf_set_rt_ifp(struct pf_state *,
 253                             struct pf_addr *);
 254 int                      pf_check_proto_cksum(struct mbuf *, int, int,
 255                             u_int8_t, sa_family_t);
 256 struct pf_divert        *pf_get_divert(struct mbuf *);
 257 void                     pf_print_state_parts(struct pf_state *,
 258                             struct pf_state_key *, struct pf_state_key *);
 259 int                      pf_addr_wrap_neq(struct pf_addr_wrap *,
 260                             struct pf_addr_wrap *);
 261 struct pf_state         *pf_find_state(struct pfi_kif *,
 262                             struct pf_state_key_cmp *, u_int, struct mbuf *);
 263 int                      pf_src_connlimit(struct pf_state **);
 264 int                      pf_check_congestion(struct ifqueue *);
 265
 266 extern int pf_end_threads;
 267
 268 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
 269         { &pf_state_pl, PFSTATE_HIWAT },
 270         { &pf_src_tree_pl, PFSNODE_HIWAT },
 271         { &pf_frent_pl, PFFRAG_FRENT_HIWAT },
 272         { &pfr_ktable_pl, PFR_KTABLE_HIWAT },
 273         { &pfr_kentry_pl, PFR_KENTRY_HIWAT }
 274 };
 275
 276 #define STATE_LOOKUP(i, k, d, s, m)                                     \
 277         do {                                                            \
 278                 s = pf_find_state(i, k, d, m);                  \
 279                 if (s == NULL || (s)->timeout == PFTM_PURGE)            \
 280                         return (PF_DROP);                               \
 281                 if (d == PF_OUT &&                                      \
 282                     (((s)->rule.ptr->rt == PF_ROUTETO &&                \
 283                     (s)->rule.ptr->direction == PF_OUT) ||              \
 284                     ((s)->rule.ptr->rt == PF_REPLYTO &&                 \
 285                     (s)->rule.ptr->direction == PF_IN)) &&              \
 286                     (s)->rt_kif != NULL &&                              \
 287                     (s)->rt_kif != i)                                   \
 288                         return (PF_PASS);                               \
 289         } while (0)
 290
 291 #define BOUND_IFACE(r, k) \
 292         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
 293
 294 #define STATE_INC_COUNTERS(s)                           \
 295         do {                                            \
 296                 s->rule.ptr->states_cur++;              \
 297                 s->rule.ptr->states_tot++;              \
 298                 if (s->anchor.ptr != NULL) {            \
 299                         s->anchor.ptr->states_cur++;    \
 300                         s->anchor.ptr->states_tot++;    \
 301                 }                                       \
 302                 if (s->nat_rule.ptr != NULL) {          \
 303                         s->nat_rule.ptr->states_cur++;  \
 304                         s->nat_rule.ptr->states_tot++;  \
 305                 }                                       \
 306         } while (0)
 307
 308 #define STATE_DEC_COUNTERS(s)                           \
 309         do {                                            \
 310                 if (s->nat_rule.ptr != NULL)            \
 311                         s->nat_rule.ptr->states_cur--;  \
 312                 if (s->anchor.ptr != NULL)              \
 313                         s->anchor.ptr->states_cur--;    \
 314                 s->rule.ptr->states_cur--;              \
 315         } while (0)
 316
 317 static MALLOC_DEFINE(M_PFSTATEPL, "pfstatepl", "pf state pool list");
 318 static MALLOC_DEFINE(M_PFSRCTREEPL, "pfsrctpl", "pf source tree pool list");
 319 static MALLOC_DEFINE(M_PFSTATEKEYPL, "pfstatekeypl", "pf state key pool list");
 320 static MALLOC_DEFINE(M_PFSTATEITEMPL, "pfstateitempl", "pf state item pool list");
 321
 322 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
 323 static __inline int pf_state_compare_key(struct pf_state_key *,
 324         struct pf_state_key *);
 325 static __inline int pf_state_compare_id(struct pf_state *,
 326         struct pf_state *);
 327
 328 struct pf_src_tree tree_src_tracking;
 329
 330 struct pf_state_tree_id tree_id;
 331 struct pf_state_queue state_list;
 332
 333 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
 334 RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key);
 335 RB_GENERATE(pf_state_tree_id, pf_state,
 336     entry_id, pf_state_compare_id);
 337
 338 static __inline int
 339 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
 340 {
 341         int     diff;
 342
 343         if (a->rule.ptr > b->rule.ptr)
 344                 return (1);
 345         if (a->rule.ptr < b->rule.ptr)
 346                 return (-1);
 347         if ((diff = a->af - b->af) != 0)
 348                 return (diff);
 349         switch (a->af) {
 350 #ifdef INET
 351         case AF_INET:
 352                 if (a->addr.addr32[0] > b->addr.addr32[0])
 353                         return (1);
 354                 if (a->addr.addr32[0] < b->addr.addr32[0])
 355                         return (-1);
 356                 break;
 357 #endif /* INET */
 358 #ifdef INET6
 359         case AF_INET6:
 360                 if (a->addr.addr32[3] > b->addr.addr32[3])
 361                         return (1);
 362                 if (a->addr.addr32[3] < b->addr.addr32[3])
 363                         return (-1);
 364                 if (a->addr.addr32[2] > b->addr.addr32[2])
 365                         return (1);
 366                 if (a->addr.addr32[2] < b->addr.addr32[2])
 367                         return (-1);
 368                 if (a->addr.addr32[1] > b->addr.addr32[1])
 369                         return (1);
 370                 if (a->addr.addr32[1] < b->addr.addr32[1])
 371                         return (-1);
 372                 if (a->addr.addr32[0] > b->addr.addr32[0])
 373                         return (1);
 374                 if (a->addr.addr32[0] < b->addr.addr32[0])
 375                         return (-1);
 376                 break;
 377 #endif /* INET6 */
 378         }
 379         return (0);
 380 }
 381
 382 u_int32_t
 383 pf_state_hash(struct pf_state_key *sk)
 384 {
 385         u_int32_t hv = (u_int32_t)(((intptr_t)sk >> 6) ^ ((intptr_t)sk >> 15));
 386         if (hv == 0)    /* disallow 0 */
 387                 hv = 1;
 388         return(hv);
 389 }
 390
 391 #ifdef INET6
 392 void
 393 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 394 {
 395         switch (af) {
 396 #ifdef INET
 397         case AF_INET:
 398                 dst->addr32[0] = src->addr32[0];
 399                 break;
 400 #endif /* INET */
 401         case AF_INET6:
 402                 dst->addr32[0] = src->addr32[0];
 403                 dst->addr32[1] = src->addr32[1];
 404                 dst->addr32[2] = src->addr32[2];
 405                 dst->addr32[3] = src->addr32[3];
 406                 break;
 407         }
 408 }
 409 #endif /* INET6 */
 410
 411 void
 412 pf_init_threshold(struct pf_threshold *threshold,
 413     u_int32_t limit, u_int32_t seconds)
 414 {
 415         threshold->limit = limit * PF_THRESHOLD_MULT;
 416         threshold->seconds = seconds;
 417         threshold->count = 0;
 418         threshold->last = time_second;
 419 }
 420
 421 void
 422 pf_add_threshold(struct pf_threshold *threshold)
 423 {
 424         u_int32_t t = time_second, diff = t - threshold->last;
 425
 426         if (diff >= threshold->seconds)
 427                 threshold->count = 0;
 428         else
 429                 threshold->count -= threshold->count * diff /
 430                     threshold->seconds;
 431         threshold->count += PF_THRESHOLD_MULT;
 432         threshold->last = t;
 433 }
 434
 435 int
 436 pf_check_threshold(struct pf_threshold *threshold)
 437 {
 438         return (threshold->count > threshold->limit);
 439 }
 440
 441 int
 442 pf_src_connlimit(struct pf_state **state)
 443 {
 444         int bad = 0;
 445
 446         (*state)->src_node->conn++;
 447         (*state)->src.tcp_est = 1;
 448         pf_add_threshold(&(*state)->src_node->conn_rate);
 449
 450         if ((*state)->rule.ptr->max_src_conn &&
 451             (*state)->rule.ptr->max_src_conn <
 452             (*state)->src_node->conn) {
 453                 pf_status.lcounters[LCNT_SRCCONN]++;
 454                 bad++;
 455         }
 456
 457         if ((*state)->rule.ptr->max_src_conn_rate.limit &&
 458             pf_check_threshold(&(*state)->src_node->conn_rate)) {
 459                 pf_status.lcounters[LCNT_SRCCONNRATE]++;
 460                 bad++;
 461         }
 462
 463         if (!bad)
 464                 return (0);
 465
 466         if ((*state)->rule.ptr->overload_tbl) {
 467                 struct pfr_addr p;
 468                 u_int32_t       killed = 0;
 469
 470                 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
 471                 if (pf_status.debug >= PF_DEBUG_MISC) {
 472                         kprintf("pf_src_connlimit: blocking address ");
 473                         pf_print_host(&(*state)->src_node->addr, 0,
 474                             (*state)->key[PF_SK_WIRE]->af);
 475                 }
 476
 477                 bzero(&p, sizeof(p));
 478                 p.pfra_af = (*state)->key[PF_SK_WIRE]->af;
 479                 switch ((*state)->key[PF_SK_WIRE]->af) {
 480 #ifdef INET
 481                 case AF_INET:
 482                         p.pfra_net = 32;
 483                         p.pfra_ip4addr = (*state)->src_node->addr.v4;
 484                         break;
 485 #endif /* INET */
 486 #ifdef INET6
 487                 case AF_INET6:
 488                         p.pfra_net = 128;
 489                         p.pfra_ip6addr = (*state)->src_node->addr.v6;
 490                         break;
 491 #endif /* INET6 */
 492                 }
 493
 494                 pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
 495                     &p, time_second);
 496
 497                 /* kill existing states if that's required. */
 498                 if ((*state)->rule.ptr->flush) {
 499                         struct pf_state_key *sk;
 500                         struct pf_state *st;
 501
 502                         pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
 503                         RB_FOREACH(st, pf_state_tree_id, &tree_id) {
 504                                 sk = st->key[PF_SK_WIRE];
 505                                 /*
 506                                  * Kill states from this source.  (Only those
 507                                  * from the same rule if PF_FLUSH_GLOBAL is not
 508                                  * set)
 509                                  */
 510                                 if (sk->af ==
 511                                     (*state)->key[PF_SK_WIRE]->af &&
 512                                     (((*state)->direction == PF_OUT &&
 513                                     PF_AEQ(&(*state)->src_node->addr,
 514                                         &sk->addr[0], sk->af)) ||
 515                                     ((*state)->direction == PF_IN &&
 516                                     PF_AEQ(&(*state)->src_node->addr,
 517                                         &sk->addr[1], sk->af))) &&
 518                                     ((*state)->rule.ptr->flush &
 519                                     PF_FLUSH_GLOBAL ||
 520                                     (*state)->rule.ptr == st->rule.ptr)) {
 521                                         st->timeout = PFTM_PURGE;
 522                                         st->src.state = st->dst.state =
 523                                             TCPS_CLOSED;
 524                                         killed++;
 525                                 }
 526                         }
 527                         if (pf_status.debug >= PF_DEBUG_MISC)
 528                                 kprintf(", %u states killed", killed);
 529                 }
 530                 if (pf_status.debug >= PF_DEBUG_MISC)
 531                         kprintf("\n");
 532         }
 533
 534         /* kill this state */
 535         (*state)->timeout = PFTM_PURGE;
 536         (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
 537         return (1);
 538 }
 539
 540 int
 541 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 542     struct pf_addr *src, sa_family_t af)
 543 {
 544         struct pf_src_node      k;
 545
 546         if (*sn == NULL) {
 547                 k.af = af;
 548                 PF_ACPY(&k.addr, src, af);
 549                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 550                     rule->rpool.opts & PF_POOL_STICKYADDR)
 551                         k.rule.ptr = rule;
 552                 else
 553                         k.rule.ptr = NULL;
 554                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
 555                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
 556         }
 557         if (*sn == NULL) {
 558                 if (!rule->max_src_nodes ||
 559                     rule->src_nodes < rule->max_src_nodes)
 560                         (*sn) = kmalloc(sizeof(struct pf_src_node), M_PFSRCTREEPL, M_NOWAIT|M_ZERO);
 561                 else
 562                         pf_status.lcounters[LCNT_SRCNODES]++;
 563                 if ((*sn) == NULL)
 564                         return (-1);
 565
 566                 pf_init_threshold(&(*sn)->conn_rate,
 567                     rule->max_src_conn_rate.limit,
 568                     rule->max_src_conn_rate.seconds);
 569
 570                 (*sn)->af = af;
 571                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
 572                     rule->rpool.opts & PF_POOL_STICKYADDR)
 573                         (*sn)->rule.ptr = rule;
 574                 else
 575                         (*sn)->rule.ptr = NULL;
 576                 PF_ACPY(&(*sn)->addr, src, af);
 577                 if (RB_INSERT(pf_src_tree,
 578                     &tree_src_tracking, *sn) != NULL) {
 579                         if (pf_status.debug >= PF_DEBUG_MISC) {
 580                                 kprintf("pf: src_tree insert failed: ");
 581                                 pf_print_host(&(*sn)->addr, 0, af);
 582                                 kprintf("\n");
 583                         }
 584                         kfree(*sn, M_PFSRCTREEPL);
 585                         return (-1);
 586                 }
 587                 (*sn)->creation = time_second;
 588                 (*sn)->ruletype = rule->action;
 589                 if ((*sn)->rule.ptr != NULL)
 590                         (*sn)->rule.ptr->src_nodes++;
 591                 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
 592                 pf_status.src_nodes++;
 593         } else {
 594                 if (rule->max_src_states &&
 595                     (*sn)->states >= rule->max_src_states) {
 596                         pf_status.lcounters[LCNT_SRCSTATES]++;
 597                         return (-1);
 598                 }
 599         }
 600         return (0);
 601 }
 602
 603 /* state table stuff */
 604
 605 static __inline int
 606 pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b)
 607 {
 608         int     diff;
 609
 610         if ((diff = a->proto - b->proto) != 0)
 611                 return (diff);
 612         if ((diff = a->af - b->af) != 0)
 613                 return (diff);
 614         switch (a->af) {
 615 #ifdef INET
 616         case AF_INET:
 617                 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
 618                         return (1);
 619                 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
 620                         return (-1);
 621                 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
 622                         return (1);
 623                 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
 624                         return (-1);
 625                 break;
 626 #endif /* INET */
 627 #ifdef INET6
 628         case AF_INET6:
 629                 if (a->addr[0].addr32[3] > b->addr[0].addr32[3])
 630                         return (1);
 631                 if (a->addr[0].addr32[3] < b->addr[0].addr32[3])
 632                         return (-1);
 633                 if (a->addr[1].addr32[3] > b->addr[1].addr32[3])
 634                         return (1);
 635                 if (a->addr[1].addr32[3] < b->addr[1].addr32[3])
 636                         return (-1);
 637                 if (a->addr[0].addr32[2] > b->addr[0].addr32[2])
 638                         return (1);
 639                 if (a->addr[0].addr32[2] < b->addr[0].addr32[2])
 640                         return (-1);
 641                 if (a->addr[1].addr32[2] > b->addr[1].addr32[2])
 642                         return (1);
 643                 if (a->addr[1].addr32[2] < b->addr[1].addr32[2])
 644                         return (-1);
 645                 if (a->addr[0].addr32[1] > b->addr[0].addr32[1])
 646                         return (1);
 647                 if (a->addr[0].addr32[1] < b->addr[0].addr32[1])
 648                         return (-1);
 649                 if (a->addr[1].addr32[1] > b->addr[1].addr32[1])
 650                         return (1);
 651                 if (a->addr[1].addr32[1] < b->addr[1].addr32[1])
 652                         return (-1);
 653                 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
 654                         return (1);
 655                 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
 656                         return (-1);
 657                 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
 658                         return (1);
 659                 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
 660                         return (-1);
 661                 break;
 662 #endif /* INET6 */
 663         }
 664
 665         if ((diff = a->port[0] - b->port[0]) != 0)
 666                 return (diff);
 667         if ((diff = a->port[1] - b->port[1]) != 0)
 668                 return (diff);
 669
 670         return (0);
 671 }
 672
 673 static __inline int
 674 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
 675 {
 676         if (a->id > b->id)
 677                 return (1);
 678         if (a->id < b->id)
 679                 return (-1);
 680         if (a->creatorid > b->creatorid)
 681                 return (1);
 682         if (a->creatorid < b->creatorid)
 683                 return (-1);
 684
 685         return (0);
 686 }
 687
 688 int
 689 pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx)
 690 {
 691         struct pf_state_item    *si;
 692         struct pf_state_key     *cur;
 693
 694         KKASSERT(s->key[idx] == NULL);  /* XXX handle this? */
 695
 696         if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl, sk)) != NULL) {
 697                 /* key exists. check for same kif, if none, add to key */
 698                 TAILQ_FOREACH(si, &cur->states, entry)
 699                         if (si->s->kif == s->kif &&
 700                             si->s->direction == s->direction) {
 701                                 if (pf_status.debug >= PF_DEBUG_MISC) {
 702                                         kprintf(
 703                                             "pf: %s key attach failed on %s: ",
 704                                             (idx == PF_SK_WIRE) ?
 705                                             "wire" : "stack",
 706                                             s->kif->pfik_name);
 707                                         pf_print_state_parts(s,
 708                                             (idx == PF_SK_WIRE) ? sk : NULL,
 709                                             (idx == PF_SK_STACK) ? sk : NULL);
 710                                         kprintf("\n");
 711                                 }
 712                                 kfree(sk, M_PFSTATEKEYPL);
 713                                 return (-1);    /* collision! */
 714                         }
 715                 kfree(sk, M_PFSTATEKEYPL);
 716
 717                 s->key[idx] = cur;
 718         } else
 719                 s->key[idx] = sk;
 720
 721         if ((si = kmalloc(sizeof(struct pf_state_item), M_PFSTATEITEMPL, M_NOWAIT)) == NULL) {
 722                 pf_state_key_detach(s, idx);
 723                 return (-1);
 724         }
 725         si->s = s;
 726
 727         /* list is sorted, if-bound states before floating */
 728         if (s->kif == pfi_all)
 729                 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry);
 730         else
 731                 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry);
 732         return (0);
 733 }
 734
 735 void
 736 pf_detach_state(struct pf_state *s)
 737 {
 738         if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK])
 739                 s->key[PF_SK_WIRE] = NULL;
 740
 741         if (s->key[PF_SK_STACK] != NULL)
 742                 pf_state_key_detach(s, PF_SK_STACK);
 743
 744         if (s->key[PF_SK_WIRE] != NULL)
 745                 pf_state_key_detach(s, PF_SK_WIRE);
 746 }
 747
 748 void
 749 pf_state_key_detach(struct pf_state *s, int idx)
 750 {
 751         struct pf_state_item    *si;
 752         si = TAILQ_FIRST(&s->key[idx]->states);
 753         while (si && si->s != s)
 754             si = TAILQ_NEXT(si, entry);
 755
 756         if (si) {
 757                 TAILQ_REMOVE(&s->key[idx]->states, si, entry);
 758                 kfree(si, M_PFSTATEITEMPL);
 759         }
 760
 761         if (TAILQ_EMPTY(&s->key[idx]->states)) {
 762                 RB_REMOVE(pf_state_tree, &pf_statetbl, s->key[idx]);
 763                 if (s->key[idx]->reverse)
 764                         s->key[idx]->reverse->reverse = NULL;
 765                 if (s->key[idx]->inp)
 766                         s->key[idx]->inp->inp_pf_sk = NULL;
 767                 kfree(s->key[idx], M_PFSTATEKEYPL);
 768         }
 769         s->key[idx] = NULL;
 770 }
 771
 772 struct pf_state_key *
 773 pf_alloc_state_key(int pool_flags)
 774 {
 775         struct pf_state_key     *sk;
 776
 777         if ((sk = kmalloc(sizeof(struct pf_state_key), M_PFSTATEKEYPL, pool_flags)) == NULL)
 778                         return (NULL);
 779         TAILQ_INIT(&sk->states);
 780
 781         return (sk);
 782 }
 783
 784 int
 785 pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr,
 786         struct pf_state_key **skw, struct pf_state_key **sks,
 787         struct pf_state_key **skp, struct pf_state_key **nkp,
 788         struct pf_addr *saddr, struct pf_addr *daddr,
 789         u_int16_t sport, u_int16_t dport)
 790 {
 791         KKASSERT((*skp == NULL && *nkp == NULL));
 792
 793         if ((*skp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL)
 794                 return (ENOMEM);
 795
 796         PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af);
 797         PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af);
 798         (*skp)->port[pd->sidx] = sport;
 799         (*skp)->port[pd->didx] = dport;
 800         (*skp)->proto = pd->proto;
 801         (*skp)->af = pd->af;
 802
 803         if (nr != NULL) {
 804                 if ((*nkp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL)
 805                         return (ENOMEM); /* caller must handle cleanup */
 806
 807                 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */
 808                 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af);
 809                 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af);
 810                 (*nkp)->port[0] = (*skp)->port[0];
 811                 (*nkp)->port[1] = (*skp)->port[1];
 812                 (*nkp)->proto = pd->proto;
 813                 (*nkp)->af = pd->af;
 814         } else
 815                 *nkp = *skp;
 816
 817         if (pd->dir == PF_IN) {
 818                 *skw = *skp;
 819                 *sks = *nkp;
 820         } else {
 821                 *sks = *skp;
 822                 *skw = *nkp;
 823         }
 824         return (0);
 825 }
 826
 827
 828 int
 829 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
 830     struct pf_state_key *sks, struct pf_state *s)
 831 {
 832         s->kif = kif;
 833
 834         if (skw == sks) {
 835                 if (pf_state_key_attach(skw, s, PF_SK_WIRE))
 836                         return (-1);
 837                 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
 838         } else {
 839                 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) {
 840                         kfree(sks, M_PFSTATEKEYPL);
 841                         return (-1);
 842                 }
 843                 if (pf_state_key_attach(sks, s, PF_SK_STACK)) {
 844                         pf_state_key_detach(s, PF_SK_WIRE);
 845                         return (-1);
 846                 }
 847         }
 848
 849         if (s->id == 0 && s->creatorid == 0) {
 850                 s->id = htobe64(pf_status.stateid++);
 851                 s->creatorid = pf_status.hostid;
 852         }
 853
 854         /*
 855          * Calculate hash code for altq
 856          */
 857         s->hash = crc32(s->key[PF_SK_WIRE], sizeof(*sks));
 858
 859         if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) {
 860                 if (pf_status.debug >= PF_DEBUG_MISC) {
 861                         kprintf("pf: state insert failed: "
 862                             "id: %016jx creatorid: %08x",
 863                               (uintmax_t)be64toh(s->id), ntohl(s->creatorid));
 864                         if (s->sync_flags & PFSTATE_FROMSYNC)
 865                                 kprintf(" (from sync)");
 866                         kprintf("\n");
 867                 }
 868                 pf_detach_state(s);
 869                 return (-1);
 870         }
 871         TAILQ_INSERT_TAIL(&state_list, s, entry_list);
 872         pf_status.fcounters[FCNT_STATE_INSERT]++;
 873         pf_status.states++;
 874         pfi_kif_ref(kif, PFI_KIF_REF_STATE);
 875         pfsync_insert_state(s);
 876         return (0);
 877 }
 878
 879 struct pf_state *
 880 pf_find_state_byid(struct pf_state_cmp *key)
 881 {
 882         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 883
 884         return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
 885 }
 886
 887 struct pf_state *
 888 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir,
 889     struct mbuf *m)
 890 {
 891         struct pf_state_key     *sk;
 892         struct pf_state_item    *si;
 893
 894         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 895
 896         if (dir == PF_OUT && m->m_pkthdr.pf.statekey &&
 897             ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse)
 898                 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse;
 899         else {
 900                 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl,
 901                     (struct pf_state_key *)key)) == NULL)
 902                         return (NULL);
 903                 if (dir == PF_OUT && m->m_pkthdr.pf.statekey) {
 904                         ((struct pf_state_key *)
 905                             m->m_pkthdr.pf.statekey)->reverse = sk;
 906                         sk->reverse = m->m_pkthdr.pf.statekey;
 907                 }
 908         }
 909
 910         if (dir == PF_OUT)
 911                 m->m_pkthdr.pf.statekey = NULL;
 912
 913         /* list is sorted, if-bound states before floating ones */
 914         TAILQ_FOREACH(si, &sk->states, entry)
 915                 if ((si->s->kif == pfi_all || si->s->kif == kif) &&
 916                     sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
 917                     si->s->key[PF_SK_STACK]))
 918                         return (si->s);
 919
 920         return (NULL);
 921 }
 922
 923 struct pf_state *
 924 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
 925 {
 926         struct pf_state_key     *sk;
 927         struct pf_state_item    *si, *ret = NULL;
 928
 929         pf_status.fcounters[FCNT_STATE_SEARCH]++;
 930
 931         sk = RB_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key);
 932
 933         if (sk != NULL) {
 934                 TAILQ_FOREACH(si, &sk->states, entry)
 935                         if (dir == PF_INOUT ||
 936                             (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
 937                             si->s->key[PF_SK_STACK]))) {
 938                                 if (more == NULL)
 939                                         return (si->s);
 940
 941                                 if (ret)
 942                                         (*more)++;
 943                                 else
 944                                         ret = si;
 945                         }
 946         }
 947         return (ret ? ret->s : NULL);
 948 }
 949
 950 /* END state table stuff */
 951
 952
 953 void
 954 pf_purge_thread(void *v)
 955 {
 956         int nloops = 0;
 957         int locked = 0;
 958
 959         lwkt_gettoken(&pf_token);
 960         for (;;) {
 961                 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz);
 962
 963                 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
 964
 965                 if (pf_end_threads) {
 966                         pf_purge_expired_states(pf_status.states, 1);
 967                         pf_purge_expired_fragments();
 968                         pf_purge_expired_src_nodes(1);
 969                         pf_end_threads++;
 970
 971                         lockmgr(&pf_consistency_lock, LK_RELEASE);
 972                         wakeup(pf_purge_thread);
 973                         kthread_exit();
 974                 }
 975                 crit_enter();
 976
 977                 /* process a fraction of the state table every second */
 978                 if(!pf_purge_expired_states(1 + (pf_status.states
 979                     / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) {
 980
 981                         pf_purge_expired_states(1 + (pf_status.states
 982                             / pf_default_rule.timeout[PFTM_INTERVAL]), 1);
 983                 }
 984
 985                 /* purge other expired types every PFTM_INTERVAL seconds */
 986                 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
 987                         pf_purge_expired_fragments();
 988                         if (!pf_purge_expired_src_nodes(locked)) {
 989                                 pf_purge_expired_src_nodes(1);
 990                         }
 991                         nloops = 0;
 992                 }
 993                 crit_exit();
 994                 lockmgr(&pf_consistency_lock, LK_RELEASE);
 995         }
 996         lwkt_reltoken(&pf_token);
 997 }
 998
 999 u_int32_t
1000 pf_state_expires(const struct pf_state *state)
1001 {
1002         u_int32_t       timeout;
1003         u_int32_t       start;
1004         u_int32_t       end;
1005         u_int32_t       states;
1006
1007         /* handle all PFTM_* > PFTM_MAX here */
1008         if (state->timeout == PFTM_PURGE)
1009                 return (time_second);
1010         if (state->timeout == PFTM_UNTIL_PACKET)
1011                 return (0);
1012         KKASSERT(state->timeout != PFTM_UNLINKED);
1013         KKASSERT(state->timeout < PFTM_MAX);
1014         timeout = state->rule.ptr->timeout[state->timeout];
1015         if (!timeout)
1016                 timeout = pf_default_rule.timeout[state->timeout];
1017         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1018         if (start) {
1019                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1020                 states = state->rule.ptr->states_cur;
1021         } else {
1022                 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1023                 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1024                 states = pf_status.states;
1025         }
1026         if (end && states > start && start < end) {
1027                 if (states < end)
1028                         return (state->expire + timeout * (end - states) /
1029                             (end - start));
1030                 else
1031                         return (time_second);
1032         }
1033         return (state->expire + timeout);
1034 }
1035
1036 int
1037 pf_purge_expired_src_nodes(int waslocked)
1038 {
1039          struct pf_src_node             *cur, *next;
1040          int                             locked = waslocked;
1041
1042          for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
1043                  next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
1044
1045                  if (cur->states <= 0 && cur->expire <= time_second) {
1046                          if (! locked) {
1047                                  lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1048                                  next = RB_NEXT(pf_src_tree,
1049                                      &tree_src_tracking, cur);
1050                                  locked = 1;
1051                          }
1052                          if (cur->rule.ptr != NULL) {
1053                                  cur->rule.ptr->src_nodes--;
1054                                  if (cur->rule.ptr->states_cur <= 0 &&
1055                                      cur->rule.ptr->max_src_nodes <= 0)
1056                                          pf_rm_rule(NULL, cur->rule.ptr);
1057                          }
1058                          RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
1059                          pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
1060                          pf_status.src_nodes--;
1061                          kfree(cur, M_PFSRCTREEPL);
1062                  }
1063          }
1064
1065          if (locked && !waslocked)
1066                 lockmgr(&pf_consistency_lock, LK_RELEASE);
1067         return(1);
1068 }
1069
1070 void
1071 pf_src_tree_remove_state(struct pf_state *s)
1072 {
1073         u_int32_t timeout;
1074
1075         if (s->src_node != NULL) {
1076                 if (s->src.tcp_est)
1077                         --s->src_node->conn;
1078                 if (--s->src_node->states <= 0) {
1079                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1080                         if (!timeout)
1081                                 timeout =
1082                                     pf_default_rule.timeout[PFTM_SRC_NODE];
1083                         s->src_node->expire = time_second + timeout;
1084                 }
1085         }
1086         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1087                 if (--s->nat_src_node->states <= 0) {
1088                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1089                         if (!timeout)
1090                                 timeout =
1091                                     pf_default_rule.timeout[PFTM_SRC_NODE];
1092                         s->nat_src_node->expire = time_second + timeout;
1093                 }
1094         }
1095         s->src_node = s->nat_src_node = NULL;
1096 }
1097
1098 /* callers should be at crit_enter() */
1099 void
1100 pf_unlink_state(struct pf_state *cur)
1101 {
1102         if (cur->src.state == PF_TCPS_PROXY_DST) {
1103                 /* XXX wire key the right one? */
1104                 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af,
1105                     &cur->key[PF_SK_WIRE]->addr[1],
1106                     &cur->key[PF_SK_WIRE]->addr[0],
1107                     cur->key[PF_SK_WIRE]->port[1],
1108                     cur->key[PF_SK_WIRE]->port[0],
1109                     cur->src.seqhi, cur->src.seqlo + 1,
1110                     TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
1111         }
1112         RB_REMOVE(pf_state_tree_id, &tree_id, cur);
1113         if (cur->creatorid == pf_status.hostid)
1114                 pfsync_delete_state(cur);
1115         cur->timeout = PFTM_UNLINKED;
1116         pf_src_tree_remove_state(cur);
1117         pf_detach_state(cur);
1118 }
1119
1120 static struct pf_state  *purge_cur;
1121
1122 /* callers should be at crit_enter() and hold the
1123  * write_lock on pf_consistency_lock */
1124 void
1125 pf_free_state(struct pf_state *cur)
1126 {
1127         if (pfsyncif != NULL &&
1128             (pfsyncif->sc_bulk_send_next == cur ||
1129             pfsyncif->sc_bulk_terminator == cur))
1130                 return;
1131         KKASSERT(cur->timeout == PFTM_UNLINKED);
1132         if (--cur->rule.ptr->states_cur <= 0 &&
1133             cur->rule.ptr->src_nodes <= 0)
1134                 pf_rm_rule(NULL, cur->rule.ptr);
1135         if (cur->nat_rule.ptr != NULL)
1136                 if (--cur->nat_rule.ptr->states_cur <= 0 &&
1137                         cur->nat_rule.ptr->src_nodes <= 0)
1138                         pf_rm_rule(NULL, cur->nat_rule.ptr);
1139         if (cur->anchor.ptr != NULL)
1140                 if (--cur->anchor.ptr->states_cur <= 0)
1141                         pf_rm_rule(NULL, cur->anchor.ptr);
1142         pf_normalize_tcp_cleanup(cur);
1143         pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE);
1144
1145         /*
1146          * We may be freeing pf_purge_expired_states()'s saved scan entry,
1147          * adjust it if necessary.
1148          */
1149         if (purge_cur == cur) {
1150                 kprintf("PURGE CONFLICT\n");
1151                 purge_cur = TAILQ_NEXT(purge_cur, entry_list);
1152         }
1153         TAILQ_REMOVE(&state_list, cur, entry_list);
1154         if (cur->tag)
1155                 pf_tag_unref(cur->tag);
1156         kfree(cur, M_PFSTATEPL);
1157         pf_status.fcounters[FCNT_STATE_REMOVALS]++;
1158         pf_status.states--;
1159 }
1160
1161 int
1162 pf_purge_expired_states(u_int32_t maxcheck, int waslocked)
1163 {
1164         struct pf_state         *cur;
1165         int                      locked = waslocked;
1166
1167         while (maxcheck--) {
1168                 /*
1169                  * Wrap to start of list when we hit the end
1170                  */
1171                 cur = purge_cur;
1172                 if (cur == NULL) {
1173                         cur = TAILQ_FIRST(&state_list);
1174                         if (cur == NULL)
1175                                 break;  /* list empty */
1176                 }
1177
1178                 /*
1179                  * Setup next (purge_cur) while we process this one.  If we block and
1180                  * something else deletes purge_cur, pf_free_state() will adjust it further
1181                  * ahead.
1182                  */
1183                 purge_cur = TAILQ_NEXT(cur, entry_list);
1184
1185                 if (cur->timeout == PFTM_UNLINKED) {
1186                         /* free unlinked state */
1187                         if (! locked) {
1188                                 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1189                                 locked = 1;
1190                         }
1191                         pf_free_state(cur);
1192                 } else if (pf_state_expires(cur) <= time_second) {
1193                         /* unlink and free expired state */
1194                         pf_unlink_state(cur);
1195                         if (! locked) {
1196                                 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE))
1197                                         return (0);
1198                                 locked = 1;
1199                         }
1200                         pf_free_state(cur);
1201                 }
1202         }
1203
1204         if (locked)
1205                 lockmgr(&pf_consistency_lock, LK_RELEASE);
1206         return (1);
1207 }
1208
1209 int
1210 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
1211 {
1212         if (aw->type != PF_ADDR_TABLE)
1213                 return (0);
1214         if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
1215                 return (1);
1216         return (0);
1217 }
1218
1219 void
1220 pf_tbladdr_remove(struct pf_addr_wrap *aw)
1221 {
1222         if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
1223                 return;
1224         pfr_detach_table(aw->p.tbl);
1225         aw->p.tbl = NULL;
1226 }
1227
1228 void
1229 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
1230 {
1231         struct pfr_ktable *kt = aw->p.tbl;
1232
1233         if (aw->type != PF_ADDR_TABLE || kt == NULL)
1234                 return;
1235         if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
1236                 kt = kt->pfrkt_root;
1237         aw->p.tbl = NULL;
1238         aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
1239                 kt->pfrkt_cnt : -1;
1240 }
1241
1242 void
1243 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1244 {
1245         switch (af) {
1246 #ifdef INET
1247         case AF_INET: {
1248                 u_int32_t a = ntohl(addr->addr32[0]);
1249                 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1250                     (a>>8)&255, a&255);
1251                 if (p) {
1252                         p = ntohs(p);
1253                         kprintf(":%u", p);
1254                 }
1255                 break;
1256         }
1257 #endif /* INET */
1258 #ifdef INET6
1259         case AF_INET6: {
1260                 u_int16_t b;
1261                 u_int8_t i, curstart = 255, curend = 0,
1262                     maxstart = 0, maxend = 0;
1263                 for (i = 0; i < 8; i++) {
1264                         if (!addr->addr16[i]) {
1265                                 if (curstart == 255)
1266                                         curstart = i;
1267                                 else
1268                                         curend = i;
1269                         } else {
1270                                 if (curstart) {
1271                                         if ((curend - curstart) >
1272                                             (maxend - maxstart)) {
1273                                                 maxstart = curstart;
1274                                                 maxend = curend;
1275                                                 curstart = 255;
1276                                         }
1277                                 }
1278                         }
1279                 }
1280                 for (i = 0; i < 8; i++) {
1281                         if (i >= maxstart && i <= maxend) {
1282                                 if (maxend != 7) {
1283                                         if (i == maxstart)
1284                                                 kprintf(":");
1285                                 } else {
1286                                         if (i == maxend)
1287                                                 kprintf(":");
1288                                 }
1289                         } else {
1290                                 b = ntohs(addr->addr16[i]);
1291                                 kprintf("%x", b);
1292                                 if (i < 7)
1293                                         kprintf(":");
1294                         }
1295                 }
1296                 if (p) {
1297                         p = ntohs(p);
1298                         kprintf("[%u]", p);
1299                 }
1300                 break;
1301         }
1302 #endif /* INET6 */
1303         }
1304 }
1305
1306 void
1307 pf_print_state(struct pf_state *s)
1308 {
1309         pf_print_state_parts(s, NULL, NULL);
1310 }
1311
1312 void
1313 pf_print_state_parts(struct pf_state *s,
1314     struct pf_state_key *skwp, struct pf_state_key *sksp)
1315 {
1316         struct pf_state_key *skw, *sks;
1317         u_int8_t proto, dir;
1318
1319         /* Do our best to fill these, but they're skipped if NULL */
1320         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1321         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1322         proto = skw ? skw->proto : (sks ? sks->proto : 0);
1323         dir = s ? s->direction : 0;
1324
1325         switch (proto) {
1326         case IPPROTO_TCP:
1327                 kprintf("TCP ");
1328                 break;
1329         case IPPROTO_UDP:
1330                 kprintf("UDP ");
1331                 break;
1332         case IPPROTO_ICMP:
1333                 kprintf("ICMP ");
1334                 break;
1335         case IPPROTO_ICMPV6:
1336                 kprintf("ICMPV6 ");
1337                 break;
1338         default:
1339                 kprintf("%u ", skw->proto);
1340                 break;
1341         }
1342         switch (dir) {
1343         case PF_IN:
1344                 kprintf(" in");
1345                 break;
1346         case PF_OUT:
1347                 kprintf(" out");
1348                 break;
1349         }
1350         if (skw) {
1351                 kprintf(" wire: ");
1352                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1353                 kprintf(" ");
1354                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1355         }
1356         if (sks) {
1357                 kprintf(" stack: ");
1358                 if (sks != skw) {
1359                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1360                         kprintf(" ");
1361                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1362                 } else
1363                         kprintf("-");
1364         }
1365         if (s) {
1366                 if (proto == IPPROTO_TCP) {
1367                         kprintf(" [lo=%u high=%u win=%u modulator=%u",
1368                             s->src.seqlo, s->src.seqhi,
1369                             s->src.max_win, s->src.seqdiff);
1370                         if (s->src.wscale && s->dst.wscale)
1371                                 kprintf(" wscale=%u",
1372                                     s->src.wscale & PF_WSCALE_MASK);
1373                         kprintf("]");
1374                         kprintf(" [lo=%u high=%u win=%u modulator=%u",
1375                             s->dst.seqlo, s->dst.seqhi,
1376                             s->dst.max_win, s->dst.seqdiff);
1377                         if (s->src.wscale && s->dst.wscale)
1378                                 kprintf(" wscale=%u",
1379                                 s->dst.wscale & PF_WSCALE_MASK);
1380                         kprintf("]");
1381                 }
1382                 kprintf(" %u:%u", s->src.state, s->dst.state);
1383         }
1384 }
1385
1386 void
1387 pf_print_flags(u_int8_t f)
1388 {
1389         if (f)
1390                 kprintf(" ");
1391         if (f & TH_FIN)
1392                 kprintf("F");
1393         if (f & TH_SYN)
1394                 kprintf("S");
1395         if (f & TH_RST)
1396                 kprintf("R");
1397         if (f & TH_PUSH)
1398                 kprintf("P");
1399         if (f & TH_ACK)
1400                 kprintf("A");
1401         if (f & TH_URG)
1402                 kprintf("U");
1403         if (f & TH_ECE)
1404                 kprintf("E");
1405         if (f & TH_CWR)
1406                 kprintf("W");
1407 }
1408
1409 #define PF_SET_SKIP_STEPS(i)                                    \
1410         do {                                                    \
1411                 while (head[i] != cur) {                        \
1412                         head[i]->skip[i].ptr = cur;             \
1413                         head[i] = TAILQ_NEXT(head[i], entries); \
1414                 }                                               \
1415         } while (0)
1416
1417 void
1418 pf_calc_skip_steps(struct pf_rulequeue *rules)
1419 {
1420         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1421         int i;
1422
1423         cur = TAILQ_FIRST(rules);
1424         prev = cur;
1425         for (i = 0; i < PF_SKIP_COUNT; ++i)
1426                 head[i] = cur;
1427         while (cur != NULL) {
1428
1429                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1430                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1431                 if (cur->direction != prev->direction)
1432                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1433                 if (cur->af != prev->af)
1434                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
1435                 if (cur->proto != prev->proto)
1436                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1437                 if (cur->src.neg != prev->src.neg ||
1438                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1439                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1440                 if (cur->src.port[0] != prev->src.port[0] ||
1441                     cur->src.port[1] != prev->src.port[1] ||
1442                     cur->src.port_op != prev->src.port_op)
1443                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1444                 if (cur->dst.neg != prev->dst.neg ||
1445                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1446                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1447                 if (cur->dst.port[0] != prev->dst.port[0] ||
1448                     cur->dst.port[1] != prev->dst.port[1] ||
1449                     cur->dst.port_op != prev->dst.port_op)
1450                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1451
1452                 prev = cur;
1453                 cur = TAILQ_NEXT(cur, entries);
1454         }
1455         for (i = 0; i < PF_SKIP_COUNT; ++i)
1456                 PF_SET_SKIP_STEPS(i);
1457 }
1458
1459 int
1460 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1461 {
1462         if (aw1->type != aw2->type)
1463                 return (1);
1464         switch (aw1->type) {
1465         case PF_ADDR_ADDRMASK:
1466         case PF_ADDR_RANGE:
1467                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1468                         return (1);
1469                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1470                         return (1);
1471                 return (0);
1472         case PF_ADDR_DYNIFTL:
1473                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1474         case PF_ADDR_NOROUTE:
1475         case PF_ADDR_URPFFAILED:
1476                 return (0);
1477         case PF_ADDR_TABLE:
1478                 return (aw1->p.tbl != aw2->p.tbl);
1479         case PF_ADDR_RTLABEL:
1480                 return (aw1->v.rtlabel != aw2->v.rtlabel);
1481         default:
1482                 kprintf("invalid address type: %d\n", aw1->type);
1483                 return (1);
1484         }
1485 }
1486
1487 u_int16_t
1488 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1489 {
1490         u_int32_t       l;
1491
1492         if (udp && !cksum)
1493                 return (0x0000);
1494         l = cksum + old - new;
1495         l = (l >> 16) + (l & 65535);
1496         l = l & 65535;
1497         if (udp && !l)
1498                 return (0xFFFF);
1499         return (l);
1500 }
1501
1502 void
1503 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1504     struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1505 {
1506         struct pf_addr  ao;
1507         u_int16_t       po = *p;
1508
1509         PF_ACPY(&ao, a, af);
1510         PF_ACPY(a, an, af);
1511
1512         *p = pn;
1513
1514         switch (af) {
1515 #ifdef INET
1516         case AF_INET:
1517                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1518                     ao.addr16[0], an->addr16[0], 0),
1519                     ao.addr16[1], an->addr16[1], 0);
1520                 *p = pn;
1521                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1522                     ao.addr16[0], an->addr16[0], u),
1523                     ao.addr16[1], an->addr16[1], u),
1524                     po, pn, u);
1525                 break;
1526 #endif /* INET */
1527 #ifdef INET6
1528         case AF_INET6:
1529                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1530                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1531                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1532                     ao.addr16[0], an->addr16[0], u),
1533                     ao.addr16[1], an->addr16[1], u),
1534                     ao.addr16[2], an->addr16[2], u),
1535                     ao.addr16[3], an->addr16[3], u),
1536                     ao.addr16[4], an->addr16[4], u),
1537                     ao.addr16[5], an->addr16[5], u),
1538                     ao.addr16[6], an->addr16[6], u),
1539                     ao.addr16[7], an->addr16[7], u),
1540                     po, pn, u);
1541                 break;
1542 #endif /* INET6 */
1543         }
1544 }
1545
1546
1547 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
1548 void
1549 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1550 {
1551         u_int32_t       ao;
1552
1553         memcpy(&ao, a, sizeof(ao));
1554         memcpy(a, &an, sizeof(u_int32_t));
1555         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1556             ao % 65536, an % 65536, u);
1557 }
1558
1559 #ifdef INET6
1560 void
1561 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1562 {
1563         struct pf_addr  ao;
1564
1565         PF_ACPY(&ao, a, AF_INET6);
1566         PF_ACPY(a, an, AF_INET6);
1567
1568         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1569             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1570             pf_cksum_fixup(pf_cksum_fixup(*c,
1571             ao.addr16[0], an->addr16[0], u),
1572             ao.addr16[1], an->addr16[1], u),
1573             ao.addr16[2], an->addr16[2], u),
1574             ao.addr16[3], an->addr16[3], u),
1575             ao.addr16[4], an->addr16[4], u),
1576             ao.addr16[5], an->addr16[5], u),
1577             ao.addr16[6], an->addr16[6], u),
1578             ao.addr16[7], an->addr16[7], u);
1579 }
1580 #endif /* INET6 */
1581
1582 void
1583 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1584     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1585     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1586 {
1587         struct pf_addr  oia, ooa;
1588
1589         PF_ACPY(&oia, ia, af);
1590         if (oa)
1591                 PF_ACPY(&ooa, oa, af);
1592
1593         /* Change inner protocol port, fix inner protocol checksum. */
1594         if (ip != NULL) {
1595                 u_int16_t       oip = *ip;
1596                 u_int32_t       opc = 0;
1597
1598                 if (pc != NULL)
1599                         opc = *pc;
1600                 *ip = np;
1601                 if (pc != NULL)
1602                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1603                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1604                 if (pc != NULL)
1605                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1606         }
1607         /* Change inner ip address, fix inner ip and icmp checksums. */
1608         PF_ACPY(ia, na, af);
1609         switch (af) {
1610 #ifdef INET
1611         case AF_INET: {
1612                 u_int32_t        oh2c = *h2c;
1613
1614                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1615                     oia.addr16[0], ia->addr16[0], 0),
1616                     oia.addr16[1], ia->addr16[1], 0);
1617                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1618                     oia.addr16[0], ia->addr16[0], 0),
1619                     oia.addr16[1], ia->addr16[1], 0);
1620                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1621                 break;
1622         }
1623 #endif /* INET */
1624 #ifdef INET6
1625         case AF_INET6:
1626                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1627                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1628                     pf_cksum_fixup(pf_cksum_fixup(*ic,
1629                     oia.addr16[0], ia->addr16[0], u),
1630                     oia.addr16[1], ia->addr16[1], u),
1631                     oia.addr16[2], ia->addr16[2], u),
1632                     oia.addr16[3], ia->addr16[3], u),
1633                     oia.addr16[4], ia->addr16[4], u),
1634                     oia.addr16[5], ia->addr16[5], u),
1635                     oia.addr16[6], ia->addr16[6], u),
1636                     oia.addr16[7], ia->addr16[7], u);
1637                 break;
1638 #endif /* INET6 */
1639         }
1640         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
1641         if (oa) {
1642                 PF_ACPY(oa, na, af);
1643                 switch (af) {
1644 #ifdef INET
1645                 case AF_INET:
1646                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1647                             ooa.addr16[0], oa->addr16[0], 0),
1648                             ooa.addr16[1], oa->addr16[1], 0);
1649                         break;
1650 #endif /* INET */
1651 #ifdef INET6
1652                 case AF_INET6:
1653                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1654                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1655                             pf_cksum_fixup(pf_cksum_fixup(*ic,
1656                             ooa.addr16[0], oa->addr16[0], u),
1657                             ooa.addr16[1], oa->addr16[1], u),
1658                             ooa.addr16[2], oa->addr16[2], u),
1659                             ooa.addr16[3], oa->addr16[3], u),
1660                             ooa.addr16[4], oa->addr16[4], u),
1661                             ooa.addr16[5], oa->addr16[5], u),
1662                             ooa.addr16[6], oa->addr16[6], u),
1663                             ooa.addr16[7], oa->addr16[7], u);
1664                         break;
1665 #endif /* INET6 */
1666                 }
1667         }
1668 }
1669
1670
1671 /*
1672  * Need to modulate the sequence numbers in the TCP SACK option
1673  * (credits to Krzysztof Pfaff for report and patch)
1674  */
1675 int
1676 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
1677     struct tcphdr *th, struct pf_state_peer *dst)
1678 {
1679         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
1680         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
1681         int copyback = 0, i, olen;
1682         struct raw_sackblock sack;
1683
1684 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
1685         if (hlen < TCPOLEN_SACKLEN ||
1686             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
1687                 return 0;
1688
1689         while (hlen >= TCPOLEN_SACKLEN) {
1690                 olen = opt[1];
1691                 switch (*opt) {
1692                 case TCPOPT_EOL:        /* FALLTHROUGH */
1693                 case TCPOPT_NOP:
1694                         opt++;
1695                         hlen--;
1696                         break;
1697                 case TCPOPT_SACK:
1698                         if (olen > hlen)
1699                                 olen = hlen;
1700                         if (olen >= TCPOLEN_SACKLEN) {
1701                                 for (i = 2; i + TCPOLEN_SACK <= olen;
1702                                     i += TCPOLEN_SACK) {
1703                                         memcpy(&sack, &opt[i], sizeof(sack));
1704                                         pf_change_a(&sack.rblk_start, &th->th_sum,
1705                                             htonl(ntohl(sack.rblk_start) -
1706                                             dst->seqdiff), 0);
1707                                         pf_change_a(&sack.rblk_end, &th->th_sum,
1708                                             htonl(ntohl(sack.rblk_end) -
1709                                             dst->seqdiff), 0);
1710                                         memcpy(&opt[i], &sack, sizeof(sack));
1711                                 }
1712                                 copyback = 1;
1713                         }
1714                         /* FALLTHROUGH */
1715                 default:
1716                         if (olen < 2)
1717                                 olen = 2;
1718                         hlen -= olen;
1719                         opt += olen;
1720                 }
1721         }
1722
1723         if (copyback)
1724                 m_copyback(m, off + sizeof(*th), thoptlen, opts);
1725         return (copyback);
1726 }
1727
1728 void
1729 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1730     const struct pf_addr *saddr, const struct pf_addr *daddr,
1731     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1732     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
1733     u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
1734 {
1735         struct mbuf     *m;
1736         int              len = 0, tlen;
1737 #ifdef INET
1738         struct ip       *h = NULL;
1739 #endif /* INET */
1740 #ifdef INET6
1741         struct ip6_hdr  *h6 = NULL;
1742 #endif /* INET6 */
1743         struct tcphdr   *th = NULL;
1744         char            *opt;
1745
1746         ASSERT_LWKT_TOKEN_HELD(&pf_token);
1747
1748         /* maximum segment size tcp option */
1749         tlen = sizeof(struct tcphdr);
1750         if (mss)
1751                 tlen += 4;
1752
1753         switch (af) {
1754 #ifdef INET
1755         case AF_INET:
1756                 len = sizeof(struct ip) + tlen;
1757                 break;
1758 #endif /* INET */
1759 #ifdef INET6
1760         case AF_INET6:
1761                 len = sizeof(struct ip6_hdr) + tlen;
1762                 break;
1763 #endif /* INET6 */
1764         }
1765
1766         /*
1767          * Create outgoing mbuf.
1768          *
1769          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1770          * so make sure pf.flags is clear.
1771          */
1772         m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1773         if (m == NULL) {
1774                 return;
1775         }
1776         if (tag)
1777                 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1778         m->m_pkthdr.pf.flags = 0;
1779         m->m_pkthdr.pf.tag = rtag;
1780         /* XXX Recheck when upgrading to > 4.4 */
1781         m->m_pkthdr.pf.statekey = NULL;
1782         if (r != NULL && r->rtableid >= 0)
1783                 m->m_pkthdr.pf.rtableid = r->rtableid;
1784
1785 #ifdef ALTQ
1786         if (r != NULL && r->qid) {
1787                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1788                 m->m_pkthdr.pf.qid = r->qid;
1789                 m->m_pkthdr.pf.ecn_af = af;
1790                 m->m_pkthdr.pf.hdr = mtod(m, struct ip *);
1791         }
1792 #endif /* ALTQ */
1793         m->m_data += max_linkhdr;
1794         m->m_pkthdr.len = m->m_len = len;
1795         m->m_pkthdr.rcvif = NULL;
1796         bzero(m->m_data, len);
1797         switch (af) {
1798 #ifdef INET
1799         case AF_INET:
1800                 h = mtod(m, struct ip *);
1801
1802                 /* IP header fields included in the TCP checksum */
1803                 h->ip_p = IPPROTO_TCP;
1804                 h->ip_len = tlen;
1805                 h->ip_src.s_addr = saddr->v4.s_addr;
1806                 h->ip_dst.s_addr = daddr->v4.s_addr;
1807
1808                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1809                 break;
1810 #endif /* INET */
1811 #ifdef INET6
1812         case AF_INET6:
1813                 h6 = mtod(m, struct ip6_hdr *);
1814
1815                 /* IP header fields included in the TCP checksum */
1816                 h6->ip6_nxt = IPPROTO_TCP;
1817                 h6->ip6_plen = htons(tlen);
1818                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1819                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1820
1821                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1822                 break;
1823 #endif /* INET6 */
1824         }
1825
1826         /* TCP header */
1827         th->th_sport = sport;
1828         th->th_dport = dport;
1829         th->th_seq = htonl(seq);
1830         th->th_ack = htonl(ack);
1831         th->th_off = tlen >> 2;
1832         th->th_flags = flags;
1833         th->th_win = htons(win);
1834
1835         if (mss) {
1836                 opt = (char *)(th + 1);
1837                 opt[0] = TCPOPT_MAXSEG;
1838                 opt[1] = 4;
1839                 mss = htons(mss);
1840                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1841         }
1842
1843         switch (af) {
1844 #ifdef INET
1845         case AF_INET:
1846                 /* TCP checksum */
1847                 th->th_sum = in_cksum(m, len);
1848
1849                 /* Finish the IP header */
1850                 h->ip_v = 4;
1851                 h->ip_hl = sizeof(*h) >> 2;
1852                 h->ip_tos = IPTOS_LOWDELAY;
1853                 h->ip_len = len;
1854                 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1855                 h->ip_ttl = ttl ? ttl : ip_defttl;
1856                 h->ip_sum = 0;
1857                 if (eh == NULL) {
1858                         lwkt_reltoken(&pf_token);
1859                         ip_output(m, NULL, NULL, 0, NULL, NULL);
1860                         lwkt_gettoken(&pf_token);
1861                 } else {
1862                         struct route             ro;
1863                         struct rtentry           rt;
1864                         struct ether_header     *e = (void *)ro.ro_dst.sa_data;
1865
1866                         if (ifp == NULL) {
1867                                 m_freem(m);
1868                                 return;
1869                         }
1870                         rt.rt_ifp = ifp;
1871                         ro.ro_rt = &rt;
1872                         ro.ro_dst.sa_len = sizeof(ro.ro_dst);
1873                         ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
1874                         bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
1875                         bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
1876                         e->ether_type = eh->ether_type;
1877                         /* XXX_IMPORT: later */
1878                         lwkt_reltoken(&pf_token);
1879                         ip_output(m, (void *)NULL, &ro, 0,
1880                             (void *)NULL, (void *)NULL);
1881                         lwkt_gettoken(&pf_token);
1882                 }
1883                 break;
1884 #endif /* INET */
1885 #ifdef INET6
1886         case AF_INET6:
1887                 /* TCP checksum */
1888                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1889                     sizeof(struct ip6_hdr), tlen);
1890
1891                 h6->ip6_vfc |= IPV6_VERSION;
1892                 h6->ip6_hlim = IPV6_DEFHLIM;
1893
1894                 lwkt_reltoken(&pf_token);
1895                 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
1896                 lwkt_gettoken(&pf_token);
1897                 break;
1898 #endif /* INET6 */
1899         }
1900 }
1901
1902 void
1903 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1904     struct pf_rule *r)
1905 {
1906         struct mbuf     *m0;
1907
1908         /*
1909          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1910          * so make sure pf.flags is clear.
1911          */
1912         if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL)
1913                 return;
1914
1915         m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1916         m0->m_pkthdr.pf.flags = 0;
1917         /* XXX Re-Check when Upgrading to > 4.4 */
1918         m0->m_pkthdr.pf.statekey = NULL;
1919
1920         if (r->rtableid >= 0)
1921                 m0->m_pkthdr.pf.rtableid = r->rtableid;
1922
1923 #ifdef ALTQ
1924         if (r->qid) {
1925                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1926                 m0->m_pkthdr.pf.qid = r->qid;
1927                 m0->m_pkthdr.pf.ecn_af = af;
1928                 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *);
1929         }
1930 #endif /* ALTQ */
1931
1932         switch (af) {
1933 #ifdef INET
1934         case AF_INET:
1935                 icmp_error(m0, type, code, 0, 0);
1936                 break;
1937 #endif /* INET */
1938 #ifdef INET6
1939         case AF_INET6:
1940                 icmp6_error(m0, type, code, 0);
1941                 break;
1942 #endif /* INET6 */
1943         }
1944 }
1945
1946 /*
1947  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1948  * If n is 0, they match if they are equal. If n is != 0, they match if they
1949  * are different.
1950  */
1951 int
1952 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1953     struct pf_addr *b, sa_family_t af)
1954 {
1955         int     match = 0;
1956
1957         switch (af) {
1958 #ifdef INET
1959         case AF_INET:
1960                 if ((a->addr32[0] & m->addr32[0]) ==
1961                     (b->addr32[0] & m->addr32[0]))
1962                         match++;
1963                 break;
1964 #endif /* INET */
1965 #ifdef INET6
1966         case AF_INET6:
1967                 if (((a->addr32[0] & m->addr32[0]) ==
1968                      (b->addr32[0] & m->addr32[0])) &&
1969                     ((a->addr32[1] & m->addr32[1]) ==
1970                      (b->addr32[1] & m->addr32[1])) &&
1971                     ((a->addr32[2] & m->addr32[2]) ==
1972                      (b->addr32[2] & m->addr32[2])) &&
1973                     ((a->addr32[3] & m->addr32[3]) ==
1974                      (b->addr32[3] & m->addr32[3])))
1975                         match++;
1976                 break;
1977 #endif /* INET6 */
1978         }
1979         if (match) {
1980                 if (n)
1981                         return (0);
1982                 else
1983                         return (1);
1984         } else {
1985                 if (n)
1986                         return (1);
1987                 else
1988                         return (0);
1989         }
1990 }
1991
1992 /*
1993  * Return 1 if b <= a <= e, otherwise return 0.
1994  */
1995 int
1996 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
1997     struct pf_addr *a, sa_family_t af)
1998 {
1999         switch (af) {
2000 #ifdef INET
2001         case AF_INET:
2002                 if ((a->addr32[0] < b->addr32[0]) ||
2003                     (a->addr32[0] > e->addr32[0]))
2004                         return (0);
2005                 break;
2006 #endif /* INET */
2007 #ifdef INET6
2008         case AF_INET6: {
2009                 int     i;
2010
2011                 /* check a >= b */
2012                 for (i = 0; i < 4; ++i)
2013                         if (a->addr32[i] > b->addr32[i])
2014                                 break;
2015                         else if (a->addr32[i] < b->addr32[i])
2016                                 return (0);
2017                 /* check a <= e */
2018                 for (i = 0; i < 4; ++i)
2019                         if (a->addr32[i] < e->addr32[i])
2020                                 break;
2021                         else if (a->addr32[i] > e->addr32[i])
2022                                 return (0);
2023                 break;
2024         }
2025 #endif /* INET6 */
2026         }
2027         return (1);
2028 }
2029
2030 int
2031 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2032 {
2033         switch (op) {
2034         case PF_OP_IRG:
2035                 return ((p > a1) && (p < a2));
2036         case PF_OP_XRG:
2037                 return ((p < a1) || (p > a2));
2038         case PF_OP_RRG:
2039                 return ((p >= a1) && (p <= a2));
2040         case PF_OP_EQ:
2041                 return (p == a1);
2042         case PF_OP_NE:
2043                 return (p != a1);
2044         case PF_OP_LT:
2045                 return (p < a1);
2046         case PF_OP_LE:
2047                 return (p <= a1);
2048         case PF_OP_GT:
2049                 return (p > a1);
2050         case PF_OP_GE:
2051                 return (p >= a1);
2052         }
2053         return (0); /* never reached */
2054 }
2055
2056 int
2057 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2058 {
2059         a1 = ntohs(a1);
2060         a2 = ntohs(a2);
2061         p = ntohs(p);
2062         return (pf_match(op, a1, a2, p));
2063 }
2064
2065 int
2066 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2067 {
2068         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2069                 return (0);
2070         return (pf_match(op, a1, a2, u));
2071 }
2072
2073 int
2074 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2075 {
2076         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2077                 return (0);
2078         return (pf_match(op, a1, a2, g));
2079 }
2080
2081 int
2082 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag)
2083 {
2084         if (*tag == -1)
2085                 *tag = m->m_pkthdr.pf.tag;
2086
2087         return ((!r->match_tag_not && r->match_tag == *tag) ||
2088             (r->match_tag_not && r->match_tag != *tag));
2089 }
2090
2091 int
2092 pf_tag_packet(struct mbuf *m, int tag, int rtableid)
2093 {
2094         if (tag <= 0 && rtableid < 0)
2095                 return (0);
2096
2097         if (tag > 0)
2098                 m->m_pkthdr.pf.tag = tag;
2099         if (rtableid >= 0)
2100                 m->m_pkthdr.pf.rtableid = rtableid;
2101
2102         return (0);
2103 }
2104
2105 void
2106 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
2107     struct pf_rule **r, struct pf_rule **a, int *match)
2108 {
2109         struct pf_anchor_stackframe     *f;
2110
2111         (*r)->anchor->match = 0;
2112         if (match)
2113                 *match = 0;
2114         if (*depth >= sizeof(pf_anchor_stack) /
2115             sizeof(pf_anchor_stack[0])) {
2116                 kprintf("pf_step_into_anchor: stack overflow\n");
2117                 *r = TAILQ_NEXT(*r, entries);
2118                 return;
2119         } else if (*depth == 0 && a != NULL)
2120                 *a = *r;
2121         f = pf_anchor_stack + (*depth)++;
2122         f->rs = *rs;
2123         f->r = *r;
2124         if ((*r)->anchor_wildcard) {
2125                 f->parent = &(*r)->anchor->children;
2126                 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
2127                     NULL) {
2128                         *r = NULL;
2129                         return;
2130                 }
2131                 *rs = &f->child->ruleset;
2132         } else {
2133                 f->parent = NULL;
2134                 f->child = NULL;
2135                 *rs = &(*r)->anchor->ruleset;
2136         }
2137         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2138 }
2139
2140 int
2141 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
2142     struct pf_rule **r, struct pf_rule **a, int *match)
2143 {
2144         struct pf_anchor_stackframe     *f;
2145         int quick = 0;
2146
2147         do {
2148                 if (*depth <= 0)
2149                         break;
2150                 f = pf_anchor_stack + *depth - 1;
2151                 if (f->parent != NULL && f->child != NULL) {
2152                         if (f->child->match ||
2153                             (match != NULL && *match)) {
2154                                 f->r->anchor->match = 1;
2155                                 *match = 0;
2156                         }
2157                         f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
2158                         if (f->child != NULL) {
2159                                 *rs = &f->child->ruleset;
2160                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2161                                 if (*r == NULL)
2162                                         continue;
2163                                 else
2164                                         break;
2165                         }
2166                 }
2167                 (*depth)--;
2168                 if (*depth == 0 && a != NULL)
2169                         *a = NULL;
2170                 *rs = f->rs;
2171                 if (f->r->anchor->match || (match != NULL && *match))
2172                         quick = f->r->quick;
2173                 *r = TAILQ_NEXT(f->r, entries);
2174         } while (*r == NULL);
2175
2176         return (quick);
2177 }
2178
2179 #ifdef INET6
2180 void
2181 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2182     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2183 {
2184         switch (af) {
2185 #ifdef INET
2186         case AF_INET:
2187                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2188                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2189                 break;
2190 #endif /* INET */
2191         case AF_INET6:
2192                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2193                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2194                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2195                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2196                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2197                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2198                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2199                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2200                 break;
2201         }
2202 }
2203
2204 void
2205 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2206 {
2207         switch (af) {
2208 #ifdef INET
2209         case AF_INET:
2210                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2211                 break;
2212 #endif /* INET */
2213         case AF_INET6:
2214                 if (addr->addr32[3] == 0xffffffff) {
2215                         addr->addr32[3] = 0;
2216                         if (addr->addr32[2] == 0xffffffff) {
2217                                 addr->addr32[2] = 0;
2218                                 if (addr->addr32[1] == 0xffffffff) {
2219                                         addr->addr32[1] = 0;
2220                                         addr->addr32[0] =
2221                                             htonl(ntohl(addr->addr32[0]) + 1);
2222                                 } else
2223                                         addr->addr32[1] =
2224                                             htonl(ntohl(addr->addr32[1]) + 1);
2225                         } else
2226                                 addr->addr32[2] =
2227                                     htonl(ntohl(addr->addr32[2]) + 1);
2228                 } else
2229                         addr->addr32[3] =
2230                             htonl(ntohl(addr->addr32[3]) + 1);
2231                 break;
2232         }
2233 }
2234 #endif /* INET6 */
2235
2236 #define mix(a,b,c) \
2237         do {                                    \
2238                 a -= b; a -= c; a ^= (c >> 13); \
2239                 b -= c; b -= a; b ^= (a << 8);  \
2240                 c -= a; c -= b; c ^= (b >> 13); \
2241                 a -= b; a -= c; a ^= (c >> 12); \
2242                 b -= c; b -= a; b ^= (a << 16); \
2243                 c -= a; c -= b; c ^= (b >> 5);  \
2244                 a -= b; a -= c; a ^= (c >> 3);  \
2245                 b -= c; b -= a; b ^= (a << 10); \
2246                 c -= a; c -= b; c ^= (b >> 15); \
2247         } while (0)
2248
2249 /*
2250  * hash function based on bridge_hash in if_bridge.c
2251  */
2252 void
2253 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
2254     struct pf_poolhashkey *key, sa_family_t af)
2255 {
2256         u_int32_t       a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
2257
2258         switch (af) {
2259 #ifdef INET
2260         case AF_INET:
2261                 a += inaddr->addr32[0];
2262                 b += key->key32[1];
2263                 mix(a, b, c);
2264                 hash->addr32[0] = c + key->key32[2];
2265                 break;
2266 #endif /* INET */
2267 #ifdef INET6
2268         case AF_INET6:
2269                 a += inaddr->addr32[0];
2270                 b += inaddr->addr32[2];
2271                 mix(a, b, c);
2272                 hash->addr32[0] = c;
2273                 a += inaddr->addr32[1];
2274                 b += inaddr->addr32[3];
2275                 c += key->key32[1];
2276                 mix(a, b, c);
2277                 hash->addr32[1] = c;
2278                 a += inaddr->addr32[2];
2279                 b += inaddr->addr32[1];
2280                 c += key->key32[2];
2281                 mix(a, b, c);
2282                 hash->addr32[2] = c;
2283                 a += inaddr->addr32[3];
2284                 b += inaddr->addr32[0];
2285                 c += key->key32[3];
2286                 mix(a, b, c);
2287                 hash->addr32[3] = c;
2288                 break;
2289 #endif /* INET6 */
2290         }
2291 }
2292
2293 int
2294 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
2295     struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
2296 {
2297         unsigned char            hash[16];
2298         struct pf_pool          *rpool = &r->rpool;
2299         struct pf_addr          *raddr = &rpool->cur->addr.v.a.addr;
2300         struct pf_addr          *rmask = &rpool->cur->addr.v.a.mask;
2301         struct pf_pooladdr      *acur = rpool->cur;
2302         struct pf_src_node       k;
2303
2304         if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
2305             (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2306                 k.af = af;
2307                 PF_ACPY(&k.addr, saddr, af);
2308                 if (r->rule_flag & PFRULE_RULESRCTRACK ||
2309                     r->rpool.opts & PF_POOL_STICKYADDR)
2310                         k.rule.ptr = r;
2311                 else
2312                         k.rule.ptr = NULL;
2313                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
2314                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
2315                 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
2316                         PF_ACPY(naddr, &(*sn)->raddr, af);
2317                         if (pf_status.debug >= PF_DEBUG_MISC) {
2318                                 kprintf("pf_map_addr: src tracking maps ");
2319                                 pf_print_host(&k.addr, 0, af);
2320                                 kprintf(" to ");
2321                                 pf_print_host(naddr, 0, af);
2322                                 kprintf("\n");
2323                         }
2324                         return (0);
2325                 }
2326         }
2327
2328         if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
2329                 return (1);
2330         if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2331                 switch (af) {
2332 #ifdef INET
2333                 case AF_INET:
2334                         if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
2335                             (rpool->opts & PF_POOL_TYPEMASK) !=
2336                             PF_POOL_ROUNDROBIN)
2337                                 return (1);
2338                          raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
2339                          rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
2340                         break;
2341 #endif /* INET */
2342 #ifdef INET6
2343                 case AF_INET6:
2344                         if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
2345                             (rpool->opts & PF_POOL_TYPEMASK) !=
2346                             PF_POOL_ROUNDROBIN)
2347                                 return (1);
2348                         raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
2349                         rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
2350                         break;
2351 #endif /* INET6 */
2352                 }
2353         } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2354                 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
2355                         return (1); /* unsupported */
2356         } else {
2357                 raddr = &rpool->cur->addr.v.a.addr;
2358                 rmask = &rpool->cur->addr.v.a.mask;
2359         }
2360
2361         switch (rpool->opts & PF_POOL_TYPEMASK) {
2362         case PF_POOL_NONE:
2363                 PF_ACPY(naddr, raddr, af);
2364                 break;
2365         case PF_POOL_BITMASK:
2366                 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
2367                 break;
2368         case PF_POOL_RANDOM:
2369                 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
2370                         switch (af) {
2371 #ifdef INET
2372                         case AF_INET:
2373                                 rpool->counter.addr32[0] = htonl(karc4random());
2374                                 break;
2375 #endif /* INET */
2376 #ifdef INET6
2377                         case AF_INET6:
2378                                 if (rmask->addr32[3] != 0xffffffff)
2379                                         rpool->counter.addr32[3] =
2380                                             htonl(karc4random());
2381                                 else
2382                                         break;
2383                                 if (rmask->addr32[2] != 0xffffffff)
2384                                         rpool->counter.addr32[2] =
2385                                             htonl(karc4random());
2386                                 else
2387                                         break;
2388                                 if (rmask->addr32[1] != 0xffffffff)
2389                                         rpool->counter.addr32[1] =
2390                                             htonl(karc4random());
2391                                 else
2392                                         break;
2393                                 if (rmask->addr32[0] != 0xffffffff)
2394                                         rpool->counter.addr32[0] =
2395                                             htonl(karc4random());
2396                                 break;
2397 #endif /* INET6 */
2398                         }
2399                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2400                         PF_ACPY(init_addr, naddr, af);
2401
2402                 } else {
2403                         PF_AINC(&rpool->counter, af);
2404                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2405                 }
2406                 break;
2407         case PF_POOL_SRCHASH:
2408                 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
2409                 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
2410                 break;
2411         case PF_POOL_ROUNDROBIN:
2412                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2413                         if (!pfr_pool_get(rpool->cur->addr.p.tbl,
2414                             &rpool->tblidx, &rpool->counter,
2415                             &raddr, &rmask, af))
2416                                 goto get_addr;
2417                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2418                         if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2419                             &rpool->tblidx, &rpool->counter,
2420                             &raddr, &rmask, af))
2421                                 goto get_addr;
2422                 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
2423                         goto get_addr;
2424
2425         try_next:
2426                 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
2427                         rpool->cur = TAILQ_FIRST(&rpool->list);
2428                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2429                         rpool->tblidx = -1;
2430                         if (pfr_pool_get(rpool->cur->addr.p.tbl,
2431                             &rpool->tblidx, &rpool->counter,
2432                             &raddr, &rmask, af)) {
2433                                 /* table contains no address of type 'af' */
2434                                 if (rpool->cur != acur)
2435                                         goto try_next;
2436                                 return (1);
2437                         }
2438                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2439                         rpool->tblidx = -1;
2440                         if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2441                             &rpool->tblidx, &rpool->counter,
2442                             &raddr, &rmask, af)) {
2443                                 /* table contains no address of type 'af' */
2444                                 if (rpool->cur != acur)
2445                                         goto try_next;
2446                                 return (1);
2447                         }
2448                 } else {
2449                         raddr = &rpool->cur->addr.v.a.addr;
2450                         rmask = &rpool->cur->addr.v.a.mask;
2451                         PF_ACPY(&rpool->counter, raddr, af);
2452                 }
2453
2454         get_addr:
2455                 PF_ACPY(naddr, &rpool->counter, af);
2456                 if (init_addr != NULL && PF_AZERO(init_addr, af))
2457                         PF_ACPY(init_addr, naddr, af);
2458                 PF_AINC(&rpool->counter, af);
2459                 break;
2460         }
2461         if (*sn != NULL)
2462                 PF_ACPY(&(*sn)->raddr, naddr, af);
2463
2464         if (pf_status.debug >= PF_DEBUG_MISC &&
2465             (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2466                 kprintf("pf_map_addr: selected address ");
2467                 pf_print_host(naddr, 0, af);
2468                 kprintf("\n");
2469         }
2470
2471         return (0);
2472 }
2473
2474 int
2475 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
2476     struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
2477     struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
2478     struct pf_src_node **sn)
2479 {
2480         struct pf_state_key_cmp key;
2481         struct pf_addr          init_addr;
2482         u_int16_t               cut;
2483
2484         bzero(&init_addr, sizeof(init_addr));
2485         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2486                 return (1);
2487
2488         if (proto == IPPROTO_ICMP) {
2489                 low = 1;
2490                 high = 65535;
2491         }
2492
2493         do {
2494                 key.af = af;
2495                 key.proto = proto;
2496                 PF_ACPY(&key.addr[1], daddr, key.af);
2497                 PF_ACPY(&key.addr[0], naddr, key.af);
2498                 key.port[1] = dport;
2499
2500                 /*
2501                  * port search; start random, step;
2502                  * similar 2 portloop in in_pcbbind
2503                  */
2504                 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
2505                     proto == IPPROTO_ICMP)) {
2506                         key.port[0] = dport;
2507                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
2508                                 return (0);
2509                 } else if (low == 0 && high == 0) {
2510                         key.port[0] = *nport;
2511                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
2512                                 return (0);
2513                 } else if (low == high) {
2514                         key.port[0] = htons(low);
2515                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
2516                                 *nport = htons(low);
2517                                 return (0);
2518                         }
2519                 } else {
2520                         u_int16_t tmp;
2521
2522                         if (low > high) {
2523                                 tmp = low;
2524                                 low = high;
2525                                 high = tmp;
2526                         }
2527                         /* low < high */
2528                         cut = htonl(karc4random()) % (1 + high - low) + low;
2529                         /* low <= cut <= high */
2530                         for (tmp = cut; tmp <= high; ++(tmp)) {
2531                                 key.port[0] = htons(tmp);
2532                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
2533                                     NULL && !in_baddynamic(tmp, proto)) {
2534                                         *nport = htons(tmp);
2535                                         return (0);
2536                                 }
2537                         }
2538                         for (tmp = cut - 1; tmp >= low; --(tmp)) {
2539                                 key.port[0] = htons(tmp);
2540                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
2541                                     NULL && !in_baddynamic(tmp, proto)) {
2542                                         *nport = htons(tmp);
2543                                         return (0);
2544                                 }
2545                         }
2546                 }
2547
2548                 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
2549                 case PF_POOL_RANDOM:
2550                 case PF_POOL_ROUNDROBIN:
2551                         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2552                                 return (1);
2553                         break;
2554                 case PF_POOL_NONE:
2555                 case PF_POOL_SRCHASH:
2556                 case PF_POOL_BITMASK:
2557                 default:
2558                         return (1);
2559                 }
2560         } while (! PF_AEQ(&init_addr, naddr, af) );
2561         return (1);                                     /* none available */
2562 }
2563
2564 struct pf_rule *
2565 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
2566     int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
2567     struct pf_addr *daddr, u_int16_t dport, int rs_num)
2568 {
2569         struct pf_rule          *r, *rm = NULL;
2570         struct pf_ruleset       *ruleset = NULL;
2571         int                      tag = -1;
2572         int                      rtableid = -1;
2573         int                      asd = 0;
2574
2575         r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
2576         while (r && rm == NULL) {
2577                 struct pf_rule_addr     *src = NULL, *dst = NULL;
2578                 struct pf_addr_wrap     *xdst = NULL;
2579
2580                 if (r->action == PF_BINAT && direction == PF_IN) {
2581                         src = &r->dst;
2582                         if (r->rpool.cur != NULL)
2583                                 xdst = &r->rpool.cur->addr;
2584                 } else {
2585                         src = &r->src;
2586                         dst = &r->dst;
2587                 }
2588
2589                 r->evaluations++;
2590                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
2591                         r = r->skip[PF_SKIP_IFP].ptr;
2592                 else if (r->direction && r->direction != direction)
2593                         r = r->skip[PF_SKIP_DIR].ptr;
2594                 else if (r->af && r->af != pd->af)
2595                         r = r->skip[PF_SKIP_AF].ptr;
2596                 else if (r->proto && r->proto != pd->proto)
2597                         r = r->skip[PF_SKIP_PROTO].ptr;
2598                 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
2599                     src->neg, kif))
2600                         r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
2601                             PF_SKIP_DST_ADDR].ptr;
2602                 else if (src->port_op && !pf_match_port(src->port_op,
2603                     src->port[0], src->port[1], sport))
2604                         r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
2605                             PF_SKIP_DST_PORT].ptr;
2606                 else if (dst != NULL &&
2607                     PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL))
2608                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
2609                 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
2610                     0, NULL))
2611                         r = TAILQ_NEXT(r, entries);
2612                 else if (dst != NULL && dst->port_op &&
2613                     !pf_match_port(dst->port_op, dst->port[0],
2614                     dst->port[1], dport))
2615                         r = r->skip[PF_SKIP_DST_PORT].ptr;
2616                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
2617                         r = TAILQ_NEXT(r, entries);
2618                 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2619                     IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2620                     off, pd->hdr.tcp), r->os_fingerprint)))
2621                         r = TAILQ_NEXT(r, entries);
2622                 else {
2623                         if (r->tag)
2624                                 tag = r->tag;
2625                         if (r->rtableid >= 0)
2626                                 rtableid = r->rtableid;
2627                         if (r->anchor == NULL) {
2628                                 rm = r;
2629                         } else
2630                                 pf_step_into_anchor(&asd, &ruleset, rs_num,
2631                                     &r, NULL, NULL);
2632                 }
2633                 if (r == NULL)
2634                         pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r,
2635                             NULL, NULL);
2636         }
2637         if (pf_tag_packet(m, tag, rtableid))
2638                 return (NULL);
2639         if (rm != NULL && (rm->action == PF_NONAT ||
2640             rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2641                 return (NULL);
2642         return (rm);
2643 }
2644
2645 struct pf_rule *
2646 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2647     struct pfi_kif *kif, struct pf_src_node **sn,
2648     struct pf_state_key **skw, struct pf_state_key **sks,
2649     struct pf_state_key **skp, struct pf_state_key **nkp,
2650     struct pf_addr *saddr, struct pf_addr *daddr,
2651     u_int16_t sport, u_int16_t dport)
2652 {
2653         struct pf_rule  *r = NULL;
2654
2655
2656         if (direction == PF_OUT) {
2657                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2658                     sport, daddr, dport, PF_RULESET_BINAT);
2659                 if (r == NULL)
2660                         r = pf_match_translation(pd, m, off, direction, kif,
2661                             saddr, sport, daddr, dport, PF_RULESET_NAT);
2662         } else {
2663                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2664                     sport, daddr, dport, PF_RULESET_RDR);
2665                 if (r == NULL)
2666                         r = pf_match_translation(pd, m, off, direction, kif,
2667                             saddr, sport, daddr, dport, PF_RULESET_BINAT);
2668         }
2669
2670         if (r != NULL) {
2671                 struct pf_addr  *naddr;
2672                 u_int16_t       *nport;
2673
2674                 if (pf_state_key_setup(pd, r, skw, sks, skp, nkp,
2675                     saddr, daddr, sport, dport))
2676                         return r;
2677
2678                 /* XXX We only modify one side for now. */
2679                 naddr = &(*nkp)->addr[1];
2680                 nport = &(*nkp)->port[1];
2681
2682                 /*
2683                  * NOTE: Currently all translations will clear
2684                  *       BRIDGE_MBUF_TAGGED, telling the bridge to
2685                  *       ignore the original input encapsulation.
2686                  */
2687                 switch (r->action) {
2688                 case PF_NONAT:
2689                 case PF_NOBINAT:
2690                 case PF_NORDR:
2691                         return (NULL);
2692                 case PF_NAT:
2693                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2694                         if (pf_get_sport(pd->af, pd->proto, r, saddr,
2695                             daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2696                             r->rpool.proxy_port[1], sn)) {
2697                                 DPFPRINTF(PF_DEBUG_MISC,
2698                                     ("pf: NAT proxy port allocation "
2699                                     "(%u-%u) failed\n",
2700                                     r->rpool.proxy_port[0],
2701                                     r->rpool.proxy_port[1]));
2702                                 return (NULL);
2703                         }
2704                         break;
2705                 case PF_BINAT:
2706                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2707                         switch (direction) {
2708                         case PF_OUT:
2709                                 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
2710                                         switch (pd->af) {
2711 #ifdef INET
2712                                         case AF_INET:
2713                                                 if (r->rpool.cur->addr.p.dyn->
2714                                                     pfid_acnt4 < 1)
2715                                                         return (NULL);
2716                                                 PF_POOLMASK(naddr,
2717                                                     &r->rpool.cur->addr.p.dyn->
2718                                                     pfid_addr4,
2719                                                     &r->rpool.cur->addr.p.dyn->
2720                                                     pfid_mask4,
2721                                                     saddr, AF_INET);
2722                                                 break;
2723 #endif /* INET */
2724 #ifdef INET6
2725                                         case AF_INET6:
2726                                                 if (r->rpool.cur->addr.p.dyn->
2727                                                     pfid_acnt6 < 1)
2728                                                         return (NULL);
2729                                                 PF_POOLMASK(naddr,
2730                                                     &r->rpool.cur->addr.p.dyn->
2731                                                     pfid_addr6,
2732                                                     &r->rpool.cur->addr.p.dyn->
2733                                                     pfid_mask6,
2734                                                     saddr, AF_INET6);
2735                                                 break;
2736 #endif /* INET6 */
2737                                         }
2738                                 } else
2739                                         PF_POOLMASK(naddr,
2740                                             &r->rpool.cur->addr.v.a.addr,
2741                                             &r->rpool.cur->addr.v.a.mask,
2742                                             saddr, pd->af);
2743                                 break;
2744                         case PF_IN:
2745                                 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
2746                                         switch (pd->af) {
2747 #ifdef INET
2748                                         case AF_INET:
2749                                                 if (r->src.addr.p.dyn->
2750                                                     pfid_acnt4 < 1)
2751                                                         return (NULL);
2752                                                 PF_POOLMASK(naddr,
2753                                                     &r->src.addr.p.dyn->
2754                                                     pfid_addr4,
2755                                                     &r->src.addr.p.dyn->
2756                                                     pfid_mask4,
2757                                                     daddr, AF_INET);
2758                                                 break;
2759 #endif /* INET */
2760 #ifdef INET6
2761                                         case AF_INET6:
2762                                                 if (r->src.addr.p.dyn->
2763                                                     pfid_acnt6 < 1)
2764                                                         return (NULL);
2765                                                 PF_POOLMASK(naddr,
2766                                                     &r->src.addr.p.dyn->
2767                                                     pfid_addr6,
2768                                                     &r->src.addr.p.dyn->
2769                                                     pfid_mask6,
2770                                                     daddr, AF_INET6);
2771                                                 break;
2772 #endif /* INET6 */
2773                                         }
2774                                 } else
2775                                         PF_POOLMASK(naddr,
2776                                             &r->src.addr.v.a.addr,
2777                                             &r->src.addr.v.a.mask, daddr,
2778                                             pd->af);
2779                                 break;
2780                         }
2781                         break;
2782                 case PF_RDR: {
2783                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2784                         if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
2785                                 return (NULL);
2786                         if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
2787                             PF_POOL_BITMASK)
2788                                 PF_POOLMASK(naddr, naddr,
2789                                     &r->rpool.cur->addr.v.a.mask, daddr,
2790                                     pd->af);
2791
2792                         if (r->rpool.proxy_port[1]) {
2793                                 u_int32_t       tmp_nport;
2794
2795                                 tmp_nport = ((ntohs(dport) -
2796                                     ntohs(r->dst.port[0])) %
2797                                     (r->rpool.proxy_port[1] -
2798                                     r->rpool.proxy_port[0] + 1)) +
2799                                     r->rpool.proxy_port[0];
2800
2801                                 /* wrap around if necessary */
2802                                 if (tmp_nport > 65535)
2803                                         tmp_nport -= 65535;
2804                                 *nport = htons((u_int16_t)tmp_nport);
2805                         } else if (r->rpool.proxy_port[0])
2806                                 *nport = htons(r->rpool.proxy_port[0]);
2807                         break;
2808                 }
2809                 default:
2810                         return (NULL);
2811                 }
2812         }
2813
2814         return (r);
2815 }
2816
2817 #ifdef SMP
2818 struct netmsg_hashlookup {
2819         struct netmsg_base      base;
2820         struct inpcb            **nm_pinp;
2821         struct inpcbinfo        *nm_pcbinfo;
2822         struct pf_addr          *nm_saddr;
2823         struct pf_addr          *nm_daddr;
2824         uint16_t                nm_sport;
2825         uint16_t                nm_dport;
2826         sa_family_t             nm_af;
2827 };
2828
2829 #ifdef PF_SOCKET_LOOKUP_DOMSG
2830 static void
2831 in_pcblookup_hash_handler(netmsg_t msg)
2832 {
2833         struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg;
2834
2835         if (rmsg->nm_af == AF_INET)
2836                 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo,
2837                     rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4,
2838                     rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2839 #ifdef INET6
2840         else
2841                 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo,
2842                     &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6,
2843                     rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2844 #endif /* INET6 */
2845         lwkt_replymsg(&rmsg->base.lmsg, 0);
2846 }
2847 #endif  /* PF_SOCKET_LOOKUP_DOMSG */
2848
2849 #endif /* SMP */
2850
2851 int
2852 pf_socket_lookup(int direction, struct pf_pdesc *pd)
2853 {
2854         struct pf_addr          *saddr, *daddr;
2855         u_int16_t                sport, dport;
2856         struct inpcbinfo        *pi;
2857         struct inpcb            *inp;
2858 #ifdef SMP
2859         struct netmsg_hashlookup *msg = NULL;
2860 #ifdef PF_SOCKET_LOOKUP_DOMSG
2861         struct netmsg_hashlookup msg0;
2862 #endif
2863 #endif
2864         int                      pi_cpu = 0;
2865
2866         if (pd == NULL)
2867                 return (-1);
2868         pd->lookup.uid = UID_MAX;
2869         pd->lookup.gid = GID_MAX;
2870         pd->lookup.pid = NO_PID;
2871         if (direction == PF_IN) {
2872                 saddr = pd->src;
2873                 daddr = pd->dst;
2874         } else {
2875                 saddr = pd->dst;
2876                 daddr = pd->src;
2877         }
2878         switch (pd->proto) {
2879         case IPPROTO_TCP:
2880                 if (pd->hdr.tcp == NULL)
2881                         return (-1);
2882                 sport = pd->hdr.tcp->th_sport;
2883                 dport = pd->hdr.tcp->th_dport;
2884
2885                 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2886                 pi = &tcbinfo[pi_cpu];
2887 #ifdef SMP
2888                 /*
2889                  * Our netstack runs lockless on MP systems
2890                  * (only for TCP connections at the moment).
2891                  *
2892                  * As we are not allowed to read another CPU's tcbinfo,
2893                  * we have to ask that CPU via remote call to search the
2894                  * table for us.
2895                  *
2896                  * Prepare a msg iff data belongs to another CPU.
2897                  */
2898                 if (pi_cpu != mycpu->gd_cpuid) {
2899 #ifdef PF_SOCKET_LOOKUP_DOMSG
2900                         /*
2901                          * NOTE:
2902                          *
2903                          * Following lwkt_domsg() is dangerous and could
2904                          * lockup the network system, e.g.
2905                          *
2906                          * On 2 CPU system:
2907                          * netisr0 domsg to netisr1 (due to lookup)
2908                          * netisr1 domsg to netisr0 (due to lookup)
2909                          *
2910                          * We simply return -1 here, since we are probably
2911                          * called before NAT, so the TCP packet should
2912                          * already be on the correct CPU.
2913                          */
2914                         msg = &msg0;
2915                         netmsg_init(&msg->base, NULL, &curthread->td_msgport,
2916                                     0, in_pcblookup_hash_handler);
2917                         msg->nm_pinp = &inp;
2918                         msg->nm_pcbinfo = pi;
2919                         msg->nm_saddr = saddr;
2920                         msg->nm_sport = sport;
2921                         msg->nm_daddr = daddr;
2922                         msg->nm_dport = dport;
2923                         msg->nm_af = pd->af;
2924 #else   /* !PF_SOCKET_LOOKUP_DOMSG */
2925                         kprintf("pf_socket_lookup: tcp packet not on the "
2926                                 "correct cpu %d, cur cpu %d\n",
2927                                 pi_cpu, mycpuid);
2928                         print_backtrace(-1);
2929                         return -1;
2930 #endif  /* PF_SOCKET_LOOKUP_DOMSG */
2931                 }
2932 #endif /* SMP */
2933                 break;
2934         case IPPROTO_UDP:
2935                 if (pd->hdr.udp == NULL)
2936                         return (-1);
2937                 sport = pd->hdr.udp->uh_sport;
2938                 dport = pd->hdr.udp->uh_dport;
2939                 pi = &udbinfo;
2940                 break;
2941         default:
2942                 return (-1);
2943         }
2944         if (direction != PF_IN) {
2945                 u_int16_t       p;
2946
2947                 p = sport;
2948                 sport = dport;
2949                 dport = p;
2950         }
2951         switch (pd->af) {
2952 #ifdef INET6
2953         case AF_INET6:
2954 #ifdef SMP
2955                 /*
2956                  * Query other CPU, second part
2957                  *
2958                  * msg only gets initialized when:
2959                  * 1) packet is TCP
2960                  * 2) the info belongs to another CPU
2961                  *
2962                  * Use some switch/case magic to avoid code duplication.
2963                  */
2964                 if (msg == NULL)
2965 #endif /* SMP */
2966                 {
2967                         inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
2968                             &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
2969
2970                         if (inp == NULL)
2971                                 return (-1);
2972                         break;
2973                 }
2974                 /* FALLTHROUGH if SMP and on other CPU */
2975 #endif /* INET6 */
2976         case AF_INET:
2977 #ifdef SMP
2978                 if (msg != NULL) {
2979                         lwkt_domsg(cpu_portfn(pi_cpu),
2980                                      &msg->base.lmsg, 0);
2981                 } else
2982 #endif /* SMP */
2983                 {
2984                         inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2985                             dport, INPLOOKUP_WILDCARD, NULL);
2986                 }
2987                 if (inp == NULL)
2988                         return (-1);
2989                 break;
2990
2991         default:
2992                 return (-1);
2993         }
2994         pd->lookup.uid = inp->inp_socket->so_cred->cr_uid;
2995         pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0];
2996         return (1);
2997 }
2998
2999 u_int8_t
3000 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3001 {
3002         int              hlen;
3003         u_int8_t         hdr[60];
3004         u_int8_t        *opt, optlen;
3005         u_int8_t         wscale = 0;
3006
3007         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
3008         if (hlen <= sizeof(struct tcphdr))
3009                 return (0);
3010         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3011                 return (0);
3012         opt = hdr + sizeof(struct tcphdr);
3013         hlen -= sizeof(struct tcphdr);
3014         while (hlen >= 3) {
3015                 switch (*opt) {
3016                 case TCPOPT_EOL:
3017                 case TCPOPT_NOP:
3018                         ++opt;
3019                         --hlen;
3020                         break;
3021                 case TCPOPT_WINDOW:
3022                         wscale = opt[2];
3023                         if (wscale > TCP_MAX_WINSHIFT)
3024                                 wscale = TCP_MAX_WINSHIFT;
3025                         wscale |= PF_WSCALE_FLAG;
3026                         /* FALLTHROUGH */
3027                 default:
3028                         optlen = opt[1];
3029                         if (optlen < 2)
3030                                 optlen = 2;
3031                         hlen -= optlen;
3032                         opt += optlen;
3033                         break;
3034                 }
3035         }
3036         return (wscale);
3037 }
3038
3039 u_int16_t
3040 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3041 {
3042         int              hlen;
3043         u_int8_t         hdr[60];
3044         u_int8_t        *opt, optlen;
3045         u_int16_t        mss = tcp_mssdflt;
3046
3047         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
3048         if (hlen <= sizeof(struct tcphdr))
3049                 return (0);
3050         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3051                 return (0);
3052         opt = hdr + sizeof(struct tcphdr);
3053         hlen -= sizeof(struct tcphdr);
3054         while (hlen >= TCPOLEN_MAXSEG) {
3055                 switch (*opt) {
3056                 case TCPOPT_EOL:
3057                 case TCPOPT_NOP:
3058                         ++opt;
3059                         --hlen;
3060                         break;
3061                 case TCPOPT_MAXSEG:
3062                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3063                         /* FALLTHROUGH */
3064                 default:
3065                         optlen = opt[1];
3066                         if (optlen < 2)
3067                                 optlen = 2;
3068                         hlen -= optlen;
3069                         opt += optlen;
3070                         break;
3071                 }
3072         }
3073         return (mss);
3074 }
3075
3076 u_int16_t
3077 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
3078 {
3079 #ifdef INET
3080         struct sockaddr_in      *dst;
3081         struct route             ro;
3082 #endif /* INET */
3083 #ifdef INET6
3084         struct sockaddr_in6     *dst6;
3085         struct route_in6         ro6;
3086 #endif /* INET6 */
3087         struct rtentry          *rt = NULL;
3088         int                      hlen = 0;
3089         u_int16_t                mss = tcp_mssdflt;
3090
3091         switch (af) {
3092 #ifdef INET
3093         case AF_INET:
3094                 hlen = sizeof(struct ip);
3095                 bzero(&ro, sizeof(ro));
3096                 dst = (struct sockaddr_in *)&ro.ro_dst;
3097                 dst->sin_family = AF_INET;
3098                 dst->sin_len = sizeof(*dst);
3099                 dst->sin_addr = addr->v4;
3100                 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
3101                 rt = ro.ro_rt;
3102                 break;
3103 #endif /* INET */
3104 #ifdef INET6
3105         case AF_INET6:
3106                 hlen = sizeof(struct ip6_hdr);
3107                 bzero(&ro6, sizeof(ro6));
3108                 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
3109                 dst6->sin6_family = AF_INET6;
3110                 dst6->sin6_len = sizeof(*dst6);
3111                 dst6->sin6_addr = addr->v6;
3112                 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
3113                 rt = ro6.ro_rt;
3114                 break;
3115 #endif /* INET6 */
3116         }
3117
3118         if (rt && rt->rt_ifp) {
3119                 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
3120                 mss = max(tcp_mssdflt, mss);
3121                 RTFREE(rt);
3122         }
3123         mss = min(mss, offer);
3124         mss = max(mss, 64);             /* sanity - at least max opt space */
3125         return (mss);
3126 }
3127
3128 void
3129 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
3130 {
3131         struct pf_rule *r = s->rule.ptr;
3132
3133         s->rt_kif = NULL;
3134         if (!r->rt || r->rt == PF_FASTROUTE)
3135                 return;
3136         switch (s->key[PF_SK_WIRE]->af) {
3137 #ifdef INET
3138         case AF_INET:
3139                 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
3140                     &s->nat_src_node);
3141                 s->rt_kif = r->rpool.cur->kif;
3142                 break;
3143 #endif /* INET */
3144 #ifdef INET6
3145         case AF_INET6:
3146                 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
3147                     &s->nat_src_node);
3148                 s->rt_kif = r->rpool.cur->kif;
3149                 break;
3150 #endif /* INET6 */
3151         }
3152 }
3153
3154 u_int32_t
3155 pf_tcp_iss(struct pf_pdesc *pd)
3156 {
3157         MD5_CTX ctx;
3158         u_int32_t digest[4];
3159
3160         if (pf_tcp_secret_init == 0) {
3161                 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret));
3162                 MD5Init(&pf_tcp_secret_ctx);
3163                 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret,
3164                     sizeof(pf_tcp_secret));
3165                 pf_tcp_secret_init = 1;
3166         }
3167         ctx = pf_tcp_secret_ctx;
3168
3169         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3170         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3171         if (pd->af == AF_INET6) {
3172                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3173                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3174         } else {
3175                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3176                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3177         }
3178         MD5Final((u_char *)digest, &ctx);
3179         pf_tcp_iss_off += 4096;
3180         return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off);
3181 }
3182
3183 int
3184 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3185     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3186     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
3187     struct ifqueue *ifq, struct inpcb *inp)
3188 {
3189         struct pf_rule          *nr = NULL;
3190         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
3191         sa_family_t              af = pd->af;
3192         struct pf_rule          *r, *a = NULL;
3193         struct pf_ruleset       *ruleset = NULL;
3194         struct pf_src_node      *nsn = NULL;
3195         struct tcphdr           *th = pd->hdr.tcp;
3196         struct pf_state_key     *skw = NULL, *sks = NULL;
3197         struct pf_state_key     *sk = NULL, *nk = NULL;
3198         u_short                  reason;
3199         int                      rewrite = 0, hdrlen = 0;
3200         int                      tag = -1, rtableid = -1;
3201         int                      asd = 0;
3202         int                      match = 0;
3203         int                      state_icmp = 0;
3204         u_int16_t                sport = 0, dport = 0;
3205         u_int16_t                nport = 0, bport = 0;
3206         u_int16_t                bproto_sum = 0, bip_sum = 0;
3207         u_int8_t                 icmptype = 0, icmpcode = 0;
3208
3209
3210         if (direction == PF_IN && pf_check_congestion(ifq)) {
3211                 REASON_SET(&reason, PFRES_CONGEST);
3212                 return (PF_DROP);
3213         }
3214
3215         if (inp != NULL)
3216                 pd->lookup.done = pf_socket_lookup(direction, pd);
3217         else if (debug_pfugidhack) {
3218                 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n"));
3219                 pd->lookup.done = pf_socket_lookup(direction, pd);
3220         }
3221
3222         switch (pd->proto) {
3223         case IPPROTO_TCP:
3224                 sport = th->th_sport;
3225                 dport = th->th_dport;
3226                 hdrlen = sizeof(*th);
3227                 break;
3228         case IPPROTO_UDP:
3229                 sport = pd->hdr.udp->uh_sport;
3230                 dport = pd->hdr.udp->uh_dport;
3231                 hdrlen = sizeof(*pd->hdr.udp);
3232                 break;
3233 #ifdef INET
3234         case IPPROTO_ICMP:
3235                 if (pd->af != AF_INET)
3236                         break;
3237                 sport = dport = pd->hdr.icmp->icmp_id;
3238                 hdrlen = sizeof(*pd->hdr.icmp);
3239                 icmptype = pd->hdr.icmp->icmp_type;
3240                 icmpcode = pd->hdr.icmp->icmp_code;
3241
3242                 if (icmptype == ICMP_UNREACH ||
3243                     icmptype == ICMP_SOURCEQUENCH ||
3244                     icmptype == ICMP_REDIRECT ||
3245                     icmptype == ICMP_TIMXCEED ||
3246                     icmptype == ICMP_PARAMPROB)
3247                         state_icmp++;
3248                 break;
3249 #endif /* INET */
3250 #ifdef INET6
3251         case IPPROTO_ICMPV6:
3252                 if (af != AF_INET6)
3253                         break;
3254                 sport = dport = pd->hdr.icmp6->icmp6_id;
3255                 hdrlen = sizeof(*pd->hdr.icmp6);
3256                 icmptype = pd->hdr.icmp6->icmp6_type;
3257                 icmpcode = pd->hdr.icmp6->icmp6_code;
3258
3259                 if (icmptype == ICMP6_DST_UNREACH ||
3260                     icmptype == ICMP6_PACKET_TOO_BIG ||
3261                     icmptype == ICMP6_TIME_EXCEEDED ||
3262                     icmptype == ICMP6_PARAM_PROB)
3263                         state_icmp++;
3264                 break;
3265 #endif /* INET6 */
3266         default:
3267                 sport = dport = hdrlen = 0;
3268                 break;
3269         }
3270
3271         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3272
3273         bport = nport = sport;
3274         /* check packet for BINAT/NAT/RDR */
3275         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn,
3276             &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) {
3277                 if (nk == NULL || sk == NULL) {
3278                         REASON_SET(&reason, PFRES_MEMORY);
3279                         goto cleanup;
3280                 }
3281
3282                 if (pd->ip_sum)
3283                         bip_sum = *pd->ip_sum;
3284
3285                 switch (pd->proto) {
3286                 case IPPROTO_TCP:
3287                         bproto_sum = th->th_sum;
3288                         pd->proto_sum = &th->th_sum;
3289
3290                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3291                             nk->port[pd->sidx] != sport) {
3292                                 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
3293                                     &th->th_sum, &nk->addr[pd->sidx],
3294                                     nk->port[pd->sidx], 0, af);
3295                                 pd->sport = &th->th_sport;
3296                                 sport = th->th_sport;
3297                         }
3298
3299                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3300                             nk->port[pd->didx] != dport) {
3301                                 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
3302                                     &th->th_sum, &nk->addr[pd->didx],
3303                                     nk->port[pd->didx], 0, af);
3304                                 dport = th->th_dport;
3305                                 pd->dport = &th->th_dport;
3306                         }
3307                         rewrite++;
3308                         break;
3309                 case IPPROTO_UDP:
3310                         bproto_sum = pd->hdr.udp->uh_sum;
3311                         pd->proto_sum = &pd->hdr.udp->uh_sum;
3312
3313                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3314                             nk->port[pd->sidx] != sport) {
3315                                 pf_change_ap(saddr, &pd->hdr.udp->uh_sport,
3316                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3317                                     &nk->addr[pd->sidx],
3318                                     nk->port[pd->sidx], 1, af);
3319                                 sport = pd->hdr.udp->uh_sport;
3320                                 pd->sport = &pd->hdr.udp->uh_sport;
3321                         }
3322
3323                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3324                             nk->port[pd->didx] != dport) {
3325                                 pf_change_ap(daddr, &pd->hdr.udp->uh_dport,
3326                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3327                                     &nk->addr[pd->didx],
3328                                     nk->port[pd->didx], 1, af);
3329                                 dport = pd->hdr.udp->uh_dport;
3330                                 pd->dport = &pd->hdr.udp->uh_dport;
3331                         }
3332                         rewrite++;
3333                         break;
3334 #ifdef INET
3335                 case IPPROTO_ICMP:
3336                         nk->port[0] = nk->port[1];
3337                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3338                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3339                                     nk->addr[pd->sidx].v4.s_addr, 0);
3340
3341                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3342                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3343                                     nk->addr[pd->didx].v4.s_addr, 0);
3344
3345                         if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3346                                 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3347                                     pd->hdr.icmp->icmp_cksum, sport,
3348                                     nk->port[1], 0);
3349                                 pd->hdr.icmp->icmp_id = nk->port[1];
3350                                 pd->sport = &pd->hdr.icmp->icmp_id;
3351                         }
3352                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3353                         break;
3354 #endif /* INET */
3355 #ifdef INET6
3356                 case IPPROTO_ICMPV6:
3357                         nk->port[0] = nk->port[1];
3358                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3359                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3360                                     &nk->addr[pd->sidx], 0);
3361
3362                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3363                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3364                                     &nk->addr[pd->didx], 0);
3365                         rewrite++;
3366                         break;
3367 #endif /* INET */
3368                 default:
3369                         switch (af) {
3370 #ifdef INET
3371                         case AF_INET:
3372                                 if (PF_ANEQ(saddr,
3373                                     &nk->addr[pd->sidx], AF_INET))
3374                                         pf_change_a(&saddr->v4.s_addr,
3375                                             pd->ip_sum,
3376                                             nk->addr[pd->sidx].v4.s_addr, 0);
3377
3378                                 if (PF_ANEQ(daddr,
3379                                     &nk->addr[pd->didx], AF_INET))
3380                                         pf_change_a(&daddr->v4.s_addr,
3381                                             pd->ip_sum,
3382                                             nk->addr[pd->didx].v4.s_addr, 0);
3383                                 break;
3384 #endif /* INET */
3385 #ifdef INET6
3386                         case AF_INET6:
3387                                 if (PF_ANEQ(saddr,
3388                                     &nk->addr[pd->sidx], AF_INET6))
3389                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3390
3391                                 if (PF_ANEQ(daddr,
3392                                     &nk->addr[pd->didx], AF_INET6))
3393                                         PF_ACPY(saddr, &nk->addr[pd->didx], af);
3394                                 break;
3395 #endif /* INET */
3396                         }
3397                         break;
3398                 }
3399                 if (nr->natpass)
3400                         r = NULL;
3401                 pd->nat_rule = nr;
3402         }
3403
3404         while (r != NULL) {
3405                 r->evaluations++;
3406                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3407                         r = r->skip[PF_SKIP_IFP].ptr;
3408                 else if (r->direction && r->direction != direction)
3409                         r = r->skip[PF_SKIP_DIR].ptr;
3410                 else if (r->af && r->af != af)
3411                         r = r->skip[PF_SKIP_AF].ptr;
3412                 else if (r->proto && r->proto != pd->proto)
3413                         r = r->skip[PF_SKIP_PROTO].ptr;
3414                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3415                     r->src.neg, kif))
3416                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3417                 /* tcp/udp only. port_op always 0 in other cases */
3418                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3419                     r->src.port[0], r->src.port[1], sport))
3420                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
3421                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3422                     r->dst.neg, NULL))
3423                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3424                 /* tcp/udp only. port_op always 0 in other cases */
3425                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3426                     r->dst.port[0], r->dst.port[1], dport))
3427                         r = r->skip[PF_SKIP_DST_PORT].ptr;
3428                 /* icmp only. type always 0 in other cases */
3429                 else if (r->type && r->type != icmptype + 1)
3430                         r = TAILQ_NEXT(r, entries);
3431                 /* icmp only. type always 0 in other cases */
3432                 else if (r->code && r->code != icmpcode + 1)
3433                         r = TAILQ_NEXT(r, entries);
3434                 else if (r->tos && !(r->tos == pd->tos))
3435                         r = TAILQ_NEXT(r, entries);
3436                 else if (r->rule_flag & PFRULE_FRAGMENT)
3437                         r = TAILQ_NEXT(r, entries);
3438                 else if (pd->proto == IPPROTO_TCP &&
3439                     (r->flagset & th->th_flags) != r->flags)
3440                         r = TAILQ_NEXT(r, entries);
3441                 /* tcp/udp only. uid.op always 0 in other cases */
3442                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3443                     pf_socket_lookup(direction, pd), 1)) &&
3444                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3445                     pd->lookup.uid))
3446                         r = TAILQ_NEXT(r, entries);
3447                 /* tcp/udp only. gid.op always 0 in other cases */
3448                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3449                     pf_socket_lookup(direction, pd), 1)) &&
3450                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3451                     pd->lookup.gid))
3452                         r = TAILQ_NEXT(r, entries);
3453                 else if (r->prob &&
3454                   r->prob <= karc4random())
3455                         r = TAILQ_NEXT(r, entries);
3456                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3457                         r = TAILQ_NEXT(r, entries);
3458                 else if (r->os_fingerprint != PF_OSFP_ANY &&
3459                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3460                     pf_osfp_fingerprint(pd, m, off, th),
3461                     r->os_fingerprint)))
3462                         r = TAILQ_NEXT(r, entries);
3463                 else {
3464                         if (r->tag)
3465                                 tag = r->tag;
3466                         if (r->rtableid >= 0)
3467                                 rtableid = r->rtableid;
3468                         if (r->anchor == NULL) {
3469                                 match = 1;
3470                                 *rm = r;
3471                                 *am = a;
3472                                 *rsm = ruleset;
3473                                 if ((*rm)->quick)
3474                                         break;
3475                                 r = TAILQ_NEXT(r, entries);
3476                         } else
3477                                 pf_step_into_anchor(&asd, &ruleset,
3478                                     PF_RULESET_FILTER, &r, &a, &match);
3479                 }
3480                 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3481                     PF_RULESET_FILTER, &r, &a, &match))
3482                         break;
3483         }
3484         r = *rm;
3485         a = *am;
3486         ruleset = *rsm;
3487
3488         REASON_SET(&reason, PFRES_MATCH);
3489
3490         if (r->log || (nr != NULL && nr->log)) {
3491                 if (rewrite)
3492                         m_copyback(m, off, hdrlen, pd->hdr.any);
3493                 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
3494                     a, ruleset, pd);
3495         }
3496
3497         if ((r->action == PF_DROP) &&
3498             ((r->rule_flag & PFRULE_RETURNRST) ||
3499             (r->rule_flag & PFRULE_RETURNICMP) ||
3500             (r->rule_flag & PFRULE_RETURN))) {
3501                 /* undo NAT changes, if they have taken place */
3502                 if (nr != NULL) {
3503                         PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3504                         PF_ACPY(daddr, &sk->addr[pd->didx], af);
3505                         if (pd->sport)
3506                                 *pd->sport = sk->port[pd->sidx];
3507                         if (pd->dport)
3508                                 *pd->dport = sk->port[pd->didx];
3509                         if (pd->proto_sum)
3510                                 *pd->proto_sum = bproto_sum;
3511                         if (pd->ip_sum)
3512                                 *pd->ip_sum = bip_sum;
3513                         m_copyback(m, off, hdrlen, pd->hdr.any);
3514                 }
3515                 if (pd->proto == IPPROTO_TCP &&
3516                     ((r->rule_flag & PFRULE_RETURNRST) ||
3517                     (r->rule_flag & PFRULE_RETURN)) &&
3518                     !(th->th_flags & TH_RST)) {
3519                         u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
3520                         int              len = 0;
3521                         struct ip       *h4;
3522 #ifdef INET6
3523                         struct ip6_hdr  *h6;
3524 #endif
3525                         switch (af) {
3526                         case AF_INET:
3527                                 h4 = mtod(m, struct ip *);
3528                                 len = h4->ip_len - off;
3529                                 break;
3530 #ifdef INET6
3531                         case AF_INET6:
3532                                 h6 = mtod(m, struct ip6_hdr *);
3533                                 len = h6->ip6_plen - (off - sizeof(*h6));
3534                                 break;
3535 #endif
3536                         }
3537
3538                         if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3539                                 REASON_SET(&reason, PFRES_PROTCKSUM);
3540                         else {
3541                                 if (th->th_flags & TH_SYN)
3542                                         ack++;
3543                                 if (th->th_flags & TH_FIN)
3544                                         ack++;
3545                                 pf_send_tcp(r, af, pd->dst,
3546                                     pd->src, th->th_dport, th->th_sport,
3547                                     ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3548                                     r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
3549                         }
3550                 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3551                     r->return_icmp)
3552                         pf_send_icmp(m, r->return_icmp >> 8,
3553                             r->return_icmp & 255, af, r);
3554                 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3555                     r->return_icmp6)
3556                         pf_send_icmp(m, r->return_icmp6 >> 8,
3557                             r->return_icmp6 & 255, af, r);
3558         }
3559
3560         if (r->action == PF_DROP)
3561                 goto cleanup;
3562
3563         if (pf_tag_packet(m, tag, rtableid)) {
3564                 REASON_SET(&reason, PFRES_MEMORY);
3565                 goto cleanup;
3566         }
3567
3568         if (!state_icmp && (r->keep_state || nr != NULL ||
3569             (pd->flags & PFDESC_TCP_NORM))) {
3570                 int action;
3571                 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m,
3572                     off, sport, dport, &rewrite, kif, sm, tag, bproto_sum,
3573                     bip_sum, hdrlen);
3574                 if (action != PF_PASS)
3575                         return (action);
3576         }
3577
3578         /* copy back packet headers if we performed NAT operations */
3579         if (rewrite)
3580                 m_copyback(m, off, hdrlen, pd->hdr.any);
3581
3582         return (PF_PASS);
3583
3584 cleanup:
3585         if (sk != NULL)
3586                 kfree(sk, M_PFSTATEKEYPL);
3587         if (nk != NULL)
3588                 kfree(nk, M_PFSTATEKEYPL);
3589         return (PF_DROP);
3590 }
3591
3592 static __inline int
3593 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3594     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw,
3595     struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk,
3596     struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite,
3597     struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum,
3598     u_int16_t bip_sum, int hdrlen)
3599 {
3600         struct pf_state         *s = NULL;
3601         struct pf_src_node      *sn = NULL;
3602         struct tcphdr           *th = pd->hdr.tcp;
3603         u_int16_t                mss = tcp_mssdflt;
3604         u_short                  reason;
3605
3606         /* check maximums */
3607         if (r->max_states && (r->states_cur >= r->max_states)) {
3608                 pf_status.lcounters[LCNT_STATES]++;
3609                 REASON_SET(&reason, PFRES_MAXSTATES);
3610                 return (PF_DROP);
3611         }
3612         /* src node for filter rule */
3613         if ((r->rule_flag & PFRULE_SRCTRACK ||
3614             r->rpool.opts & PF_POOL_STICKYADDR) &&
3615             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3616                 REASON_SET(&reason, PFRES_SRCLIMIT);
3617                 goto csfailed;
3618         }
3619         /* src node for translation rule */
3620         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3621             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3622                 REASON_SET(&reason, PFRES_SRCLIMIT);
3623                 goto csfailed;
3624         }
3625         s = kmalloc(sizeof(struct pf_state), M_PFSTATEPL, M_NOWAIT|M_ZERO);
3626         if (s == NULL) {
3627                 REASON_SET(&reason, PFRES_MEMORY);
3628                 goto csfailed;
3629         }
3630         s->id = 0; /* XXX Do we really need that? not in OpenBSD */
3631         s->creatorid = 0;
3632         s->rule.ptr = r;
3633         s->nat_rule.ptr = nr;
3634         s->anchor.ptr = a;
3635         STATE_INC_COUNTERS(s);
3636         if (r->allow_opts)
3637                 s->state_flags |= PFSTATE_ALLOWOPTS;
3638         if (r->rule_flag & PFRULE_STATESLOPPY)
3639                 s->state_flags |= PFSTATE_SLOPPY;
3640         s->log = r->log & PF_LOG_ALL;
3641         if (nr != NULL)
3642                 s->log |= nr->log & PF_LOG_ALL;
3643         switch (pd->proto) {
3644         case IPPROTO_TCP:
3645                 s->src.seqlo = ntohl(th->th_seq);
3646                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3647                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3648                     r->keep_state == PF_STATE_MODULATE) {
3649                         /* Generate sequence number modulator */
3650                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3651                             0)
3652                                 s->src.seqdiff = 1;
3653                         pf_change_a(&th->th_seq, &th->th_sum,
3654                             htonl(s->src.seqlo + s->src.seqdiff), 0);
3655                         *rewrite = 1;
3656                 } else
3657                         s->src.seqdiff = 0;
3658                 if (th->th_flags & TH_SYN) {
3659                         s->src.seqhi++;
3660                         s->src.wscale = pf_get_wscale(m, off,
3661                             th->th_off, pd->af);
3662                 }
3663                 s->src.max_win = MAX(ntohs(th->th_win), 1);
3664                 if (s->src.wscale & PF_WSCALE_MASK) {
3665                         /* Remove scale factor from initial window */
3666                         int win = s->src.max_win;
3667                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3668                         s->src.max_win = (win - 1) >>
3669                             (s->src.wscale & PF_WSCALE_MASK);
3670                 }
3671                 if (th->th_flags & TH_FIN)
3672                         s->src.seqhi++;
3673                 s->dst.seqhi = 1;
3674                 s->dst.max_win = 1;
3675                 s->src.state = TCPS_SYN_SENT;
3676                 s->dst.state = TCPS_CLOSED;
3677                 s->timeout = PFTM_TCP_FIRST_PACKET;
3678                 break;
3679         case IPPROTO_UDP:
3680                 s->src.state = PFUDPS_SINGLE;
3681                 s->dst.state = PFUDPS_NO_TRAFFIC;
3682                 s->timeout = PFTM_UDP_FIRST_PACKET;
3683                 break;
3684         case IPPROTO_ICMP:
3685 #ifdef INET6
3686         case IPPROTO_ICMPV6:
3687 #endif
3688                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3689                 break;
3690         default:
3691                 s->src.state = PFOTHERS_SINGLE;
3692                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3693                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3694         }
3695
3696         s->creation = time_second;
3697         s->expire = time_second;
3698
3699         if (sn != NULL) {
3700                 s->src_node = sn;
3701                 s->src_node->states++;
3702         }
3703         if (nsn != NULL) {
3704                 /* XXX We only modify one side for now. */
3705                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3706                 s->nat_src_node = nsn;
3707                 s->nat_src_node->states++;
3708         }
3709         if (pd->proto == IPPROTO_TCP) {
3710                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3711                     off, pd, th, &s->src, &s->dst)) {
3712                         REASON_SET(&reason, PFRES_MEMORY);
3713                         pf_src_tree_remove_state(s);
3714                         STATE_DEC_COUNTERS(s);
3715                         kfree(s, M_PFSTATEPL);
3716                         return (PF_DROP);
3717                 }
3718                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3719                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3720                     &s->src, &s->dst, rewrite)) {
3721                         /* This really shouldn't happen!!! */
3722                         DPFPRINTF(PF_DEBUG_URGENT,
3723                             ("pf_normalize_tcp_stateful failed on first pkt"));
3724                         pf_normalize_tcp_cleanup(s);
3725                         pf_src_tree_remove_state(s);
3726                         STATE_DEC_COUNTERS(s);
3727                         kfree(s, M_PFSTATEPL);
3728                         return (PF_DROP);
3729                 }
3730         }
3731         s->direction = pd->dir;
3732
3733         if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk,
3734             pd->src, pd->dst, sport, dport))
3735                 goto csfailed;
3736
3737         if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) {
3738                 if (pd->proto == IPPROTO_TCP)
3739                         pf_normalize_tcp_cleanup(s);
3740                 REASON_SET(&reason, PFRES_STATEINS);
3741                 pf_src_tree_remove_state(s);
3742                 STATE_DEC_COUNTERS(s);
3743                 kfree(s, M_PFSTATEPL);
3744                 return (PF_DROP);
3745         } else
3746                 *sm = s;
3747
3748         pf_set_rt_ifp(s, pd->src);      /* needs s->state_key set */
3749         if (tag > 0) {
3750                 pf_tag_ref(tag);
3751                 s->tag = tag;
3752         }
3753         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3754             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3755                 s->src.state = PF_TCPS_PROXY_SRC;
3756                 /* undo NAT changes, if they have taken place */
3757                 if (nr != NULL) {
3758                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
3759                         if (pd->dir == PF_OUT)
3760                                 skt = s->key[PF_SK_STACK];
3761                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3762                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3763                         if (pd->sport)
3764                                 *pd->sport = skt->port[pd->sidx];
3765                         if (pd->dport)
3766                                 *pd->dport = skt->port[pd->didx];
3767                         if (pd->proto_sum)
3768                                 *pd->proto_sum = bproto_sum;
3769                         if (pd->ip_sum)
3770                                 *pd->ip_sum = bip_sum;
3771                         m_copyback(m, off, hdrlen, pd->hdr.any);
3772                 }
3773                 s->src.seqhi = htonl(karc4random());
3774                 /* Find mss option */
3775                 mss = pf_get_mss(m, off, th->th_off, pd->af);
3776                 mss = pf_calc_mss(pd->src, pd->af, mss);
3777                 mss = pf_calc_mss(pd->dst, pd->af, mss);
3778                 s->src.mss = mss;
3779                 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport,
3780                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3781                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
3782                 REASON_SET(&reason, PFRES_SYNPROXY);
3783                 return (PF_SYNPROXY_DROP);
3784         }
3785
3786         return (PF_PASS);
3787
3788 csfailed:
3789         if (sk != NULL)
3790                 kfree(sk, M_PFSTATEKEYPL);
3791         if (nk != NULL)
3792                 kfree(nk, M_PFSTATEKEYPL);
3793
3794         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3795                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3796                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3797                 pf_status.src_nodes--;
3798                 kfree(sn, M_PFSRCTREEPL);
3799         }
3800         if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) {
3801                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3802                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3803                 pf_status.src_nodes--;
3804                 kfree(nsn, M_PFSRCTREEPL);
3805         }
3806         return (PF_DROP);
3807 }
3808
3809 int
3810 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3811     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3812     struct pf_ruleset **rsm)
3813 {
3814         struct pf_rule          *r, *a = NULL;
3815         struct pf_ruleset       *ruleset = NULL;
3816         sa_family_t              af = pd->af;
3817         u_short                  reason;
3818         int                      tag = -1;
3819         int                      asd = 0;
3820         int                      match = 0;
3821
3822         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3823         while (r != NULL) {
3824                 r->evaluations++;
3825                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3826                         r = r->skip[PF_SKIP_IFP].ptr;
3827                 else if (r->direction && r->direction != direction)
3828                         r = r->skip[PF_SKIP_DIR].ptr;
3829                 else if (r->af && r->af != af)
3830                         r = r->skip[PF_SKIP_AF].ptr;
3831                 else if (r->proto && r->proto != pd->proto)
3832                         r = r->skip[PF_SKIP_PROTO].ptr;
3833                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3834                     r->src.neg, kif))
3835                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3836                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3837                     r->dst.neg, NULL))
3838                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3839                 else if (r->tos && !(r->tos == pd->tos))
3840                         r = TAILQ_NEXT(r, entries);
3841                 else if (r->os_fingerprint != PF_OSFP_ANY)
3842                         r = TAILQ_NEXT(r, entries);
3843                 else if (pd->proto == IPPROTO_UDP &&
3844                     (r->src.port_op || r->dst.port_op))
3845                         r = TAILQ_NEXT(r, entries);
3846                 else if (pd->proto == IPPROTO_TCP &&
3847                     (r->src.port_op || r->dst.port_op || r->flagset))
3848                         r = TAILQ_NEXT(r, entries);
3849                 else if ((pd->proto == IPPROTO_ICMP ||
3850                     pd->proto == IPPROTO_ICMPV6) &&
3851                     (r->type || r->code))
3852                         r = TAILQ_NEXT(r, entries);
3853                 else if (r->prob && r->prob <= karc4random())
3854                         r = TAILQ_NEXT(r, entries);
3855                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3856                         r = TAILQ_NEXT(r, entries);
3857                 else {
3858                         if (r->anchor == NULL) {
3859                                 match = 1;
3860                                 *rm = r;
3861                                 *am = a;
3862                                 *rsm = ruleset;
3863                                 if ((*rm)->quick)
3864                                         break;
3865                                 r = TAILQ_NEXT(r, entries);
3866                         } else
3867                                 pf_step_into_anchor(&asd, &ruleset,
3868                                     PF_RULESET_FILTER, &r, &a, &match);
3869                 }
3870                 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3871                     PF_RULESET_FILTER, &r, &a, &match))
3872                         break;
3873         }
3874         r = *rm;
3875         a = *am;
3876         ruleset = *rsm;
3877
3878         REASON_SET(&reason, PFRES_MATCH);
3879
3880         if (r->log)
3881                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
3882                     pd);
3883
3884         if (r->action != PF_PASS)
3885                 return (PF_DROP);
3886
3887         if (pf_tag_packet(m, tag, -1)) {
3888                 REASON_SET(&reason, PFRES_MEMORY);
3889                 return (PF_DROP);
3890         }
3891
3892         return (PF_PASS);
3893 }
3894
3895 int
3896 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3897         struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3898         struct pf_pdesc *pd, u_short *reason, int *copyback)
3899 {
3900         struct tcphdr           *th = pd->hdr.tcp;
3901         u_int16_t                win = ntohs(th->th_win);
3902         u_int32_t                ack, end, seq, orig_seq;
3903         u_int8_t                 sws, dws;
3904         int                      ackskew;
3905
3906         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3907                 sws = src->wscale & PF_WSCALE_MASK;
3908                 dws = dst->wscale & PF_WSCALE_MASK;
3909         } else
3910                 sws = dws = 0;
3911
3912         /*
3913          * Sequence tracking algorithm from Guido van Rooij's paper:
3914          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3915          *      tcp_filtering.ps
3916          */
3917
3918         orig_seq = seq = ntohl(th->th_seq);
3919         if (src->seqlo == 0) {
3920                 /* First packet from this end. Set its state */
3921
3922                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3923                     src->scrub == NULL) {
3924                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3925                                 REASON_SET(reason, PFRES_MEMORY);
3926                                 return (PF_DROP);
3927                         }
3928                 }
3929
3930                 /* Deferred generation of sequence number modulator */
3931                 if (dst->seqdiff && !src->seqdiff) {
3932                         /* use random iss for the TCP server */
3933                         while ((src->seqdiff = karc4random() - seq) == 0)
3934                                 ;
3935                         ack = ntohl(th->th_ack) - dst->seqdiff;
3936                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3937                             src->seqdiff), 0);
3938                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3939                         *copyback = 1;
3940                 } else {
3941                         ack = ntohl(th->th_ack);
3942                 }
3943
3944                 end = seq + pd->p_len;
3945                 if (th->th_flags & TH_SYN) {
3946                         end++;
3947                         (*state)->sync_flags |= PFSTATE_GOT_SYN2;
3948                         if (dst->wscale & PF_WSCALE_FLAG) {
3949                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3950                                     pd->af);
3951                                 if (src->wscale & PF_WSCALE_FLAG) {
3952                                         /* Remove scale factor from initial
3953                                          * window */
3954                                         sws = src->wscale & PF_WSCALE_MASK;
3955                                         win = ((u_int32_t)win + (1 << sws) - 1)
3956                                             >> sws;
3957                                         dws = dst->wscale & PF_WSCALE_MASK;
3958                                 } else {
3959                                         /* fixup other window */
3960                                         dst->max_win <<= dst->wscale &
3961                                             PF_WSCALE_MASK;
3962                                         /* in case of a retrans SYN|ACK */
3963                                         dst->wscale = 0;
3964                                 }
3965                         }
3966                 }
3967                 if (th->th_flags & TH_FIN)
3968                         end++;
3969
3970                 src->seqlo = seq;
3971                 if (src->state < TCPS_SYN_SENT)
3972                         src->state = TCPS_SYN_SENT;
3973
3974                 /*
3975                  * May need to slide the window (seqhi may have been set by
3976                  * the crappy stack check or if we picked up the connection
3977                  * after establishment)
3978                  */
3979                 if (src->seqhi == 1 ||
3980                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3981                         src->seqhi = end + MAX(1, dst->max_win << dws);
3982                 if (win > src->max_win)
3983                         src->max_win = win;
3984
3985         } else {
3986                 ack = ntohl(th->th_ack) - dst->seqdiff;
3987                 if (src->seqdiff) {
3988                         /* Modulate sequence numbers */
3989                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3990                             src->seqdiff), 0);
3991                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3992                         *copyback = 1;
3993                 }
3994                 end = seq + pd->p_len;
3995                 if (th->th_flags & TH_SYN)
3996                         end++;
3997                 if (th->th_flags & TH_FIN)
3998                         end++;
3999         }
4000
4001         if ((th->th_flags & TH_ACK) == 0) {
4002                 /* Let it pass through the ack skew check */
4003                 ack = dst->seqlo;
4004         } else if ((ack == 0 &&
4005             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
4006             /* broken tcp stacks do not set ack */
4007             (dst->state < TCPS_SYN_SENT)) {
4008                 /*
4009                  * Many stacks (ours included) will set the ACK number in an
4010                  * FIN|ACK if the SYN times out -- no sequence to ACK.
4011                  */
4012                 ack = dst->seqlo;
4013         }
4014
4015         if (seq == end) {
4016                 /* Ease sequencing restrictions on no data packets */
4017                 seq = src->seqlo;
4018                 end = seq;
4019         }
4020
4021         ackskew = dst->seqlo - ack;
4022
4023
4024         /*
4025          * Need to demodulate the sequence numbers in any TCP SACK options
4026          * (Selective ACK). We could optionally validate the SACK values
4027          * against the current ACK window, either forwards or backwards, but
4028          * I'm not confident that SACK has been implemented properly
4029          * everywhere. It wouldn't surprise me if several stacks accidently
4030          * SACK too far backwards of previously ACKed data. There really aren't
4031          * any security implications of bad SACKing unless the target stack
4032          * doesn't validate the option length correctly. Someone trying to
4033          * spoof into a TCP connection won't bother blindly sending SACK
4034          * options anyway.
4035          */
4036         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4037                 if (pf_modulate_sack(m, off, pd, th, dst))
4038                         *copyback = 1;
4039         }
4040
4041
4042 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
4043         if (SEQ_GEQ(src->seqhi, end) &&
4044             /* Last octet inside other's window space */
4045             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4046             /* Retrans: not more than one window back */
4047             (ackskew >= -MAXACKWINDOW) &&
4048             /* Acking not more than one reassembled fragment backwards */
4049             (ackskew <= (MAXACKWINDOW << sws)) &&
4050             /* Acking not more than one window forward */
4051             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4052             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4053             (pd->flags & PFDESC_IP_REAS) == 0)) {
4054             /* Require an exact/+1 sequence match on resets when possible */
4055
4056                 if (dst->scrub || src->scrub) {
4057                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4058                             *state, src, dst, copyback))
4059                                 return (PF_DROP);
4060                 }
4061
4062                 /* update max window */
4063                 if (src->max_win < win)
4064                         src->max_win = win;
4065                 /* synchronize sequencing */
4066                 if (SEQ_GT(end, src->seqlo))
4067                         src->seqlo = end;
4068                 /* slide the window of what the other end can send */
4069                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4070                         dst->seqhi = ack + MAX((win << sws), 1);
4071
4072
4073                 /* update states */
4074                 if (th->th_flags & TH_SYN)
4075                         if (src->state < TCPS_SYN_SENT)
4076                                 src->state = TCPS_SYN_SENT;
4077                 if (th->th_flags & TH_FIN)
4078                         if (src->state < TCPS_CLOSING)
4079                                 src->state = TCPS_CLOSING;
4080                 if (th->th_flags & TH_ACK) {
4081                         if (dst->state == TCPS_SYN_SENT) {
4082                                 dst->state = TCPS_ESTABLISHED;
4083                                 if (src->state == TCPS_ESTABLISHED &&
4084                                     (*state)->src_node != NULL &&
4085                                     pf_src_connlimit(state)) {
4086                                         REASON_SET(reason, PFRES_SRCLIMIT);
4087                                         return (PF_DROP);
4088                                 }
4089                         } else if (dst->state == TCPS_CLOSING)
4090                                 dst->state = TCPS_FIN_WAIT_2;
4091                 }
4092                 if (th->th_flags & TH_RST)
4093                         src->state = dst->state = TCPS_TIME_WAIT;
4094
4095                 /* update expire time */
4096                 (*state)->expire = time_second;
4097                 if (src->state >= TCPS_FIN_WAIT_2 &&
4098                     dst->state >= TCPS_FIN_WAIT_2)
4099                         (*state)->timeout = PFTM_TCP_CLOSED;
4100                 else if (src->state >= TCPS_CLOSING &&
4101                     dst->state >= TCPS_CLOSING)
4102                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
4103                 else if (src->state < TCPS_ESTABLISHED ||
4104                     dst->state < TCPS_ESTABLISHED)
4105                         (*state)->timeout = PFTM_TCP_OPENING;
4106                 else if (src->state >= TCPS_CLOSING ||
4107                     dst->state >= TCPS_CLOSING)
4108                         (*state)->timeout = PFTM_TCP_CLOSING;
4109                 else
4110                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4111
4112                 /* Fall through to PASS packet */
4113
4114         } else if ((dst->state < TCPS_SYN_SENT ||
4115                 dst->state >= TCPS_FIN_WAIT_2 ||
4116                 src->state >= TCPS_FIN_WAIT_2) &&
4117             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4118             /* Within a window forward of the originating packet */
4119             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4120             /* Within a window backward of the originating packet */
4121
4122                 /*
4123                  * This currently handles three situations:
4124                  *  1) Stupid stacks will shotgun SYNs before their peer
4125                  *     replies.
4126                  *  2) When PF catches an already established stream (the
4127                  *     firewall rebooted, the state table was flushed, routes
4128                  *     changed...)
4129                  *  3) Packets get funky immediately after the connection
4130                  *     closes (this should catch Solaris spurious ACK|FINs
4131                  *     that web servers like to spew after a close)
4132                  *
4133                  * This must be a little more careful than the above code
4134                  * since packet floods will also be caught here. We don't
4135                  * update the TTL here to mitigate the damage of a packet
4136                  * flood and so the same code can handle awkward establishment
4137                  * and a loosened connection close.
4138                  * In the establishment case, a correct peer response will
4139                  * validate the connection, go through the normal state code
4140                  * and keep updating the state TTL.
4141                  */
4142
4143                 if (pf_status.debug >= PF_DEBUG_MISC) {
4144                         kprintf("pf: loose state match: ");
4145                         pf_print_state(*state);
4146                         pf_print_flags(th->th_flags);
4147                         kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4148                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len,
4149                             ackskew, (unsigned long long)(*state)->packets[0],
4150                             (unsigned long long)(*state)->packets[1],
4151                             pd->dir == PF_IN ? "in" : "out",
4152                             pd->dir == (*state)->direction ? "fwd" : "rev");
4153                 }
4154
4155                 if (dst->scrub || src->scrub) {
4156                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4157                             *state, src, dst, copyback))
4158                                 return (PF_DROP);
4159                 }
4160
4161                 /* update max window */
4162                 if (src->max_win < win)
4163                         src->max_win = win;
4164                 /* synchronize sequencing */
4165                 if (SEQ_GT(end, src->seqlo))
4166                         src->seqlo = end;
4167                 /* slide the window of what the other end can send */
4168                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4169                         dst->seqhi = ack + MAX((win << sws), 1);
4170
4171                 /*
4172                  * Cannot set dst->seqhi here since this could be a shotgunned
4173                  * SYN and not an already established connection.
4174                  */
4175
4176                 if (th->th_flags & TH_FIN)
4177                         if (src->state < TCPS_CLOSING)
4178                                 src->state = TCPS_CLOSING;
4179                 if (th->th_flags & TH_RST)
4180                         src->state = dst->state = TCPS_TIME_WAIT;
4181
4182                 /* Fall through to PASS packet */
4183
4184         } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY ||
4185                     ((*state)->pickup_mode == PF_PICKUPS_ENABLED &&
4186                      ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) !=
4187                       PFSTATE_GOT_SYN_MASK)) {
4188                 /*
4189                  * If pickup mode is hash only, do not fail on sequence checks.
4190                  *
4191                  * If pickup mode is enabled and we did not see the SYN in
4192                  * both direction, do not fail on sequence checks because
4193                  * we do not have complete information on window scale.
4194                  *
4195                  * Adjust expiration and fall through to PASS packet.
4196                  * XXX Add a FIN check to reduce timeout?
4197                  */
4198                 (*state)->expire = time_second;
4199         } else  {
4200                 /*
4201                  * Failure processing
4202                  */
4203                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4204                     (*state)->src.state == TCPS_SYN_SENT) {
4205                         /* Send RST for state mismatches during handshake */
4206                         if (!(th->th_flags & TH_RST))
4207                                 pf_send_tcp((*state)->rule.ptr, pd->af,
4208                                     pd->dst, pd->src, th->th_dport,
4209                                     th->th_sport, ntohl(th->th_ack), 0,
4210                                     TH_RST, 0, 0,
4211                                     (*state)->rule.ptr->return_ttl, 1, 0,
4212                                     pd->eh, kif->pfik_ifp);
4213                         src->seqlo = 0;
4214                         src->seqhi = 1;
4215                         src->max_win = 1;
4216                 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4217                         kprintf("pf: BAD state: ");
4218                         pf_print_state(*state);
4219                         pf_print_flags(th->th_flags);
4220                         kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4221                             "pkts=%llu:%llu dir=%s,%s\n",
4222                             seq, orig_seq, ack, pd->p_len, ackskew,
4223                             (unsigned long long)(*state)->packets[0],
4224                                 (unsigned long long)(*state)->packets[1],
4225                             pd->dir == PF_IN ? "in" : "out",
4226                             pd->dir == (*state)->direction ? "fwd" : "rev");
4227                         kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4228                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4229                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4230                             ' ': '2',
4231                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4232                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4233                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4234                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4235                 }
4236                 REASON_SET(reason, PFRES_BADSTATE);
4237                 return (PF_DROP);
4238         }
4239
4240         return (PF_PASS);
4241 }
4242
4243 int
4244 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4245         struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4246 {
4247         struct tcphdr           *th = pd->hdr.tcp;
4248
4249         if (th->th_flags & TH_SYN)
4250                 if (src->state < TCPS_SYN_SENT)
4251                         src->state = TCPS_SYN_SENT;
4252         if (th->th_flags & TH_FIN)
4253                 if (src->state < TCPS_CLOSING)
4254                         src->state = TCPS_CLOSING;
4255         if (th->th_flags & TH_ACK) {
4256                 if (dst->state == TCPS_SYN_SENT) {
4257                         dst->state = TCPS_ESTABLISHED;
4258                         if (src->state == TCPS_ESTABLISHED &&
4259                             (*state)->src_node != NULL &&
4260                             pf_src_connlimit(state)) {
4261                                 REASON_SET(reason, PFRES_SRCLIMIT);
4262                                 return (PF_DROP);
4263                         }
4264                 } else if (dst->state == TCPS_CLOSING) {
4265                         dst->state = TCPS_FIN_WAIT_2;
4266                 } else if (src->state == TCPS_SYN_SENT &&
4267                     dst->state < TCPS_SYN_SENT) {
4268                         /*
4269                          * Handle a special sloppy case where we only see one
4270                          * half of the connection. If there is a ACK after
4271                          * the initial SYN without ever seeing a packet from
4272                          * the destination, set the connection to established.
4273                          */
4274                         dst->state = src->state = TCPS_ESTABLISHED;
4275                         if ((*state)->src_node != NULL &&
4276                             pf_src_connlimit(state)) {
4277                                 REASON_SET(reason, PFRES_SRCLIMIT);
4278                                 return (PF_DROP);
4279                         }
4280                 } else if (src->state == TCPS_CLOSING &&
4281                     dst->state == TCPS_ESTABLISHED &&
4282                     dst->seqlo == 0) {
4283                         /*
4284                          * Handle the closing of half connections where we
4285                          * don't see the full bidirectional FIN/ACK+ACK
4286                          * handshake.
4287                          */
4288                         dst->state = TCPS_CLOSING;
4289                 }
4290         }
4291         if (th->th_flags & TH_RST)
4292                 src->state = dst->state = TCPS_TIME_WAIT;
4293
4294         /* update expire time */
4295         (*state)->expire = time_second;
4296         if (src->state >= TCPS_FIN_WAIT_2 &&
4297             dst->state >= TCPS_FIN_WAIT_2)
4298                 (*state)->timeout = PFTM_TCP_CLOSED;
4299         else if (src->state >= TCPS_CLOSING &&
4300             dst->state >= TCPS_CLOSING)
4301                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4302         else if (src->state < TCPS_ESTABLISHED ||
4303             dst->state < TCPS_ESTABLISHED)
4304                 (*state)->timeout = PFTM_TCP_OPENING;
4305         else if (src->state >= TCPS_CLOSING ||
4306             dst->state >= TCPS_CLOSING)
4307                 (*state)->timeout = PFTM_TCP_CLOSING;
4308         else
4309                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4310
4311         return (PF_PASS);
4312 }
4313
4314 int
4315 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4316     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4317     u_short *reason)
4318 {
4319         struct pf_state_key_cmp  key;
4320         struct tcphdr           *th = pd->hdr.tcp;
4321         int                      copyback = 0;
4322         struct pf_state_peer    *src, *dst;
4323         struct pf_state_key     *sk;
4324
4325         key.af = pd->af;
4326         key.proto = IPPROTO_TCP;
4327         if (direction == PF_IN) {       /* wire side, straight */
4328                 PF_ACPY(&key.addr[0], pd->src, key.af);
4329                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4330                 key.port[0] = th->th_sport;
4331                 key.port[1] = th->th_dport;
4332         } else {                        /* stack side, reverse */
4333                 PF_ACPY(&key.addr[1], pd->src, key.af);
4334                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4335                 key.port[1] = th->th_sport;
4336                 key.port[0] = th->th_dport;
4337         }
4338
4339         STATE_LOOKUP(kif, &key, direction, *state, m);
4340
4341         if (direction == (*state)->direction) {
4342                 src = &(*state)->src;
4343                 dst = &(*state)->dst;
4344         } else {
4345                 src = &(*state)->dst;
4346                 dst = &(*state)->src;
4347         }
4348
4349         sk = (*state)->key[pd->didx];
4350
4351         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4352                 if (direction != (*state)->direction) {
4353                         REASON_SET(reason, PFRES_SYNPROXY);
4354                         return (PF_SYNPROXY_DROP);
4355                 }
4356                 if (th->th_flags & TH_SYN) {
4357                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4358                                 REASON_SET(reason, PFRES_SYNPROXY);
4359                                 return (PF_DROP);
4360                         }
4361                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4362                             pd->src, th->th_dport, th->th_sport,
4363                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4364                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
4365                             0, NULL, NULL);
4366                         REASON_SET(reason, PFRES_SYNPROXY);
4367                         return (PF_SYNPROXY_DROP);
4368                 } else if (!(th->th_flags & TH_ACK) ||
4369                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4370                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4371                         REASON_SET(reason, PFRES_SYNPROXY);
4372                         return (PF_DROP);
4373                 } else if ((*state)->src_node != NULL &&
4374                     pf_src_connlimit(state)) {
4375                         REASON_SET(reason, PFRES_SRCLIMIT);
4376                         return (PF_DROP);
4377                 } else
4378                         (*state)->src.state = PF_TCPS_PROXY_DST;
4379         }
4380         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4381                 if (direction == (*state)->direction) {
4382                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4383                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4384                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4385                                 REASON_SET(reason, PFRES_SYNPROXY);
4386                                 return (PF_DROP);
4387                         }
4388                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4389                         if ((*state)->dst.seqhi == 1)
4390                                 (*state)->dst.seqhi = htonl(karc4random());
4391                         pf_send_tcp((*state)->rule.ptr, pd->af,
4392                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4393                             sk->port[pd->sidx], sk->port[pd->didx],
4394                             (*state)->dst.seqhi, 0, TH_SYN, 0,
4395                             (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
4396                         REASON_SET(reason, PFRES_SYNPROXY);
4397                         return (PF_SYNPROXY_DROP);
4398                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4399                     (TH_SYN|TH_ACK)) ||
4400                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4401                         REASON_SET(reason, PFRES_SYNPROXY);
4402                         return (PF_DROP);
4403                 } else {
4404                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4405                         (*state)->dst.seqlo = ntohl(th->th_seq);
4406                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4407                             pd->src, th->th_dport, th->th_sport,
4408                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4409                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
4410                             (*state)->tag, NULL, NULL);
4411                         pf_send_tcp((*state)->rule.ptr, pd->af,
4412                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4413                             sk->port[pd->sidx], sk->port[pd->didx],
4414                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4415                             TH_ACK, (*state)->dst.max_win, 0, 0, 1,
4416                             0, NULL, NULL);
4417                         (*state)->src.seqdiff = (*state)->dst.seqhi -
4418                             (*state)->src.seqlo;
4419                         (*state)->dst.seqdiff = (*state)->src.seqhi -
4420                             (*state)->dst.seqlo;
4421                         (*state)->src.seqhi = (*state)->src.seqlo +
4422                             (*state)->dst.max_win;
4423                         (*state)->dst.seqhi = (*state)->dst.seqlo +
4424                             (*state)->src.max_win;
4425                         (*state)->src.wscale = (*state)->dst.wscale = 0;
4426                         (*state)->src.state = (*state)->dst.state =
4427                             TCPS_ESTABLISHED;
4428                         REASON_SET(reason, PFRES_SYNPROXY);
4429                         return (PF_SYNPROXY_DROP);
4430                 }
4431         }
4432
4433         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4434             dst->state >= TCPS_FIN_WAIT_2 &&
4435             src->state >= TCPS_FIN_WAIT_2) {
4436                 if (pf_status.debug >= PF_DEBUG_MISC) {
4437                         kprintf("pf: state reuse ");
4438                         pf_print_state(*state);
4439                         pf_print_flags(th->th_flags);
4440                         kprintf("\n");
4441                 }
4442                 /* XXX make sure it's the same direction ?? */
4443                 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4444                 pf_unlink_state(*state);
4445                 *state = NULL;
4446                 return (PF_DROP);
4447         }
4448
4449         if ((*state)->state_flags & PFSTATE_SLOPPY) {
4450                 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4451                         return (PF_DROP);
4452         } else {
4453                 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4454                     &copyback) == PF_DROP)
4455                         return (PF_DROP);
4456         }
4457
4458         /* translate source/destination address, if necessary */
4459         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4460                 struct pf_state_key *nk = (*state)->key[pd->didx];
4461
4462                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4463                     nk->port[pd->sidx] != th->th_sport)  {
4464                         /*
4465                          * The translated source address may be completely
4466                          * unrelated to the saved link header, make sure
4467                          * a bridge doesn't try to use it.
4468                          */
4469                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
4470                         m->m_flags &= ~M_HASH;
4471                         pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4472                             &th->th_sum, &nk->addr[pd->sidx],
4473                             nk->port[pd->sidx], 0, pd->af);
4474                 }
4475
4476                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4477                     nk->port[pd->didx] != th->th_dport) {
4478                         /*
4479                          * If we don't redispatch the packet will go into
4480                          * the protocol stack on the wrong cpu for the
4481                          * post-translated address.
4482                          */
4483                         m->m_flags &= ~M_HASH;
4484                         pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4485                             &th->th_sum, &nk->addr[pd->didx],
4486                             nk->port[pd->didx], 0, pd->af);
4487                 }
4488                 copyback = 1;
4489         }
4490
4491         /* Copyback sequence modulation or stateful scrub changes if needed */
4492         if (copyback)
4493                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4494
4495         return (PF_PASS);
4496 }
4497
4498 int
4499 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4500     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4501 {
4502         struct pf_state_peer    *src, *dst;
4503         struct pf_state_key_cmp  key;
4504         struct udphdr           *uh = pd->hdr.udp;
4505
4506         key.af = pd->af;
4507         key.proto = IPPROTO_UDP;
4508         if (direction == PF_IN) {       /* wire side, straight */
4509                 PF_ACPY(&key.addr[0], pd->src, key.af);
4510                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4511                 key.port[0] = uh->uh_sport;
4512                 key.port[1] = uh->uh_dport;
4513         } else {                        /* stack side, reverse */
4514                 PF_ACPY(&key.addr[1], pd->src, key.af);
4515                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4516                 key.port[1] = uh->uh_sport;
4517                 key.port[0] = uh->uh_dport;
4518         }
4519
4520         STATE_LOOKUP(kif, &key, direction, *state, m);
4521
4522         if (direction == (*state)->direction) {
4523                 src = &(*state)->src;
4524                 dst = &(*state)->dst;
4525         } else {
4526                 src = &(*state)->dst;
4527                 dst = &(*state)->src;
4528         }
4529
4530         /* update states */
4531         if (src->state < PFUDPS_SINGLE)
4532                 src->state = PFUDPS_SINGLE;
4533         if (dst->state == PFUDPS_SINGLE)
4534                 dst->state = PFUDPS_MULTIPLE;
4535
4536         /* update expire time */
4537         (*state)->expire = time_second;
4538         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4539                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4540         else
4541                 (*state)->timeout = PFTM_UDP_SINGLE;
4542
4543         /* translate source/destination address, if necessary */
4544         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4545                 struct pf_state_key *nk = (*state)->key[pd->didx];
4546
4547                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4548                     nk->port[pd->sidx] != uh->uh_sport) {
4549                         /*
4550                          * The translated source address may be completely
4551                          * unrelated to the saved link header, make sure
4552                          * a bridge doesn't try to use it.
4553                          */
4554                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
4555                         m->m_flags &= ~M_HASH;
4556                         pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4557                             &uh->uh_sum, &nk->addr[pd->sidx],
4558                             nk->port[pd->sidx], 1, pd->af);
4559                 }
4560
4561                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4562                     nk->port[pd->didx] != uh->uh_dport) {
4563                         /*
4564                          * If we don't redispatch the packet will go into
4565                          * the protocol stack on the wrong cpu for the
4566                          * post-translated address.
4567                          */
4568                         m->m_flags &= ~M_HASH;
4569                         pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4570                             &uh->uh_sum, &nk->addr[pd->didx],
4571                             nk->port[pd->didx], 1, pd->af);
4572                 }
4573                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4574         }
4575
4576         return (PF_PASS);
4577 }
4578
4579 int
4580 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4581     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4582 {
4583         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4584         u_int16_t        icmpid = 0, *icmpsum;
4585         u_int8_t         icmptype;
4586         int              state_icmp = 0;
4587         struct pf_state_key_cmp key;
4588
4589         switch (pd->proto) {
4590 #ifdef INET
4591         case IPPROTO_ICMP:
4592                 icmptype = pd->hdr.icmp->icmp_type;
4593                 icmpid = pd->hdr.icmp->icmp_id;
4594                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4595
4596                 if (icmptype == ICMP_UNREACH ||
4597                     icmptype == ICMP_SOURCEQUENCH ||
4598                     icmptype == ICMP_REDIRECT ||
4599                     icmptype == ICMP_TIMXCEED ||
4600                     icmptype == ICMP_PARAMPROB)
4601                         state_icmp++;
4602                 break;
4603 #endif /* INET */
4604 #ifdef INET6
4605         case IPPROTO_ICMPV6:
4606                 icmptype = pd->hdr.icmp6->icmp6_type;
4607                 icmpid = pd->hdr.icmp6->icmp6_id;
4608                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4609
4610                 if (icmptype == ICMP6_DST_UNREACH ||
4611                     icmptype == ICMP6_PACKET_TOO_BIG ||
4612                     icmptype == ICMP6_TIME_EXCEEDED ||
4613                     icmptype == ICMP6_PARAM_PROB)
4614                         state_icmp++;
4615                 break;
4616 #endif /* INET6 */
4617         }
4618
4619         if (!state_icmp) {
4620
4621                 /*
4622                  * ICMP query/reply message not related to a TCP/UDP packet.
4623                  * Search for an ICMP state.
4624                  */
4625                 key.af = pd->af;
4626                 key.proto = pd->proto;
4627                 key.port[0] = key.port[1] = icmpid;
4628                 if (direction == PF_IN) {       /* wire side, straight */
4629                         PF_ACPY(&key.addr[0], pd->src, key.af);
4630                         PF_ACPY(&key.addr[1], pd->dst, key.af);
4631                 } else {                        /* stack side, reverse */
4632                         PF_ACPY(&key.addr[1], pd->src, key.af);
4633                         PF_ACPY(&key.addr[0], pd->dst, key.af);
4634                 }
4635
4636                 STATE_LOOKUP(kif, &key, direction, *state, m);
4637
4638                 (*state)->expire = time_second;
4639                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4640
4641                 /* translate source/destination address, if necessary */
4642                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4643                         struct pf_state_key *nk = (*state)->key[pd->didx];
4644
4645                         switch (pd->af) {
4646 #ifdef INET
4647                         case AF_INET:
4648                                 if (PF_ANEQ(pd->src,
4649                                     &nk->addr[pd->sidx], AF_INET))
4650                                         pf_change_a(&saddr->v4.s_addr,
4651                                             pd->ip_sum,
4652                                             nk->addr[pd->sidx].v4.s_addr, 0);
4653
4654                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4655                                     AF_INET))
4656                                         pf_change_a(&daddr->v4.s_addr,
4657                                             pd->ip_sum,
4658                                             nk->addr[pd->didx].v4.s_addr, 0);
4659
4660                                 if (nk->port[0] !=
4661                                     pd->hdr.icmp->icmp_id) {
4662                                         pd->hdr.icmp->icmp_cksum =
4663                                             pf_cksum_fixup(
4664                                             pd->hdr.icmp->icmp_cksum, icmpid,
4665                                             nk->port[pd->sidx], 0);
4666                                         pd->hdr.icmp->icmp_id =
4667                                             nk->port[pd->sidx];
4668                                 }
4669
4670                                 m_copyback(m, off, ICMP_MINLEN,
4671                                     (caddr_t)pd->hdr.icmp);
4672                                 break;
4673 #endif /* INET */
4674 #ifdef INET6
4675                         case AF_INET6:
4676                                 if (PF_ANEQ(pd->src,
4677                                     &nk->addr[pd->sidx], AF_INET6))
4678                                         pf_change_a6(saddr,
4679                                             &pd->hdr.icmp6->icmp6_cksum,
4680                                             &nk->addr[pd->sidx], 0);
4681
4682                                 if (PF_ANEQ(pd->dst,
4683                                     &nk->addr[pd->didx], AF_INET6))
4684                                         pf_change_a6(daddr,
4685                                             &pd->hdr.icmp6->icmp6_cksum,
4686                                             &nk->addr[pd->didx], 0);
4687
4688                                 m_copyback(m, off,
4689                                         sizeof(struct icmp6_hdr),
4690                                         (caddr_t)pd->hdr.icmp6);
4691                                 break;
4692 #endif /* INET6 */
4693                         }
4694                 }
4695                 return (PF_PASS);
4696
4697         } else {
4698                 /*
4699                  * ICMP error message in response to a TCP/UDP packet.
4700                  * Extract the inner TCP/UDP header and search for that state.
4701                  */
4702
4703                 struct pf_pdesc pd2;
4704 #ifdef INET
4705                 struct ip       h2;
4706 #endif /* INET */
4707 #ifdef INET6
4708                 struct ip6_hdr  h2_6;
4709                 int             terminal = 0;
4710 #endif /* INET6 */
4711                 int             ipoff2;
4712                 int             off2;
4713
4714                 pd2.af = pd->af;
4715                 /* Payload packet is from the opposite direction. */
4716                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
4717                 pd2.didx = (direction == PF_IN) ? 0 : 1;
4718                 switch (pd->af) {
4719 #ifdef INET
4720                 case AF_INET:
4721                         /* offset of h2 in mbuf chain */
4722                         ipoff2 = off + ICMP_MINLEN;
4723
4724                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4725                             NULL, reason, pd2.af)) {
4726                                 DPFPRINTF(PF_DEBUG_MISC,
4727                                     ("pf: ICMP error message too short "
4728                                     "(ip)\n"));
4729                                 return (PF_DROP);
4730                         }
4731                         /*
4732                          * ICMP error messages don't refer to non-first
4733                          * fragments
4734                          */
4735                         if (h2.ip_off & htons(IP_OFFMASK)) {
4736                                 REASON_SET(reason, PFRES_FRAG);
4737                                 return (PF_DROP);
4738                         }
4739
4740                         /* offset of protocol header that follows h2 */
4741                         off2 = ipoff2 + (h2.ip_hl << 2);
4742
4743                         pd2.proto = h2.ip_p;
4744                         pd2.src = (struct pf_addr *)&h2.ip_src;
4745                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4746                         pd2.ip_sum = &h2.ip_sum;
4747                         break;
4748 #endif /* INET */
4749 #ifdef INET6
4750                 case AF_INET6:
4751                         ipoff2 = off + sizeof(struct icmp6_hdr);
4752
4753                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4754                             NULL, reason, pd2.af)) {
4755                                 DPFPRINTF(PF_DEBUG_MISC,
4756                                     ("pf: ICMP error message too short "
4757                                     "(ip6)\n"));
4758                                 return (PF_DROP);
4759                         }
4760                         pd2.proto = h2_6.ip6_nxt;
4761                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4762                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4763                         pd2.ip_sum = NULL;
4764                         off2 = ipoff2 + sizeof(h2_6);
4765                         do {
4766                                 switch (pd2.proto) {
4767                                 case IPPROTO_FRAGMENT:
4768                                         /*
4769                                          * ICMPv6 error messages for
4770                                          * non-first fragments
4771                                          */
4772                                         REASON_SET(reason, PFRES_FRAG);
4773                                         return (PF_DROP);
4774                                 case IPPROTO_AH:
4775                                 case IPPROTO_HOPOPTS:
4776                                 case IPPROTO_ROUTING:
4777                                 case IPPROTO_DSTOPTS: {
4778                                         /* get next header and header length */
4779                                         struct ip6_ext opt6;
4780
4781                                         if (!pf_pull_hdr(m, off2, &opt6,
4782                                             sizeof(opt6), NULL, reason,
4783                                             pd2.af)) {
4784                                                 DPFPRINTF(PF_DEBUG_MISC,
4785                                                     ("pf: ICMPv6 short opt\n"));
4786                                                 return (PF_DROP);
4787                                         }
4788                                         if (pd2.proto == IPPROTO_AH)
4789                                                 off2 += (opt6.ip6e_len + 2) * 4;
4790                                         else
4791                                                 off2 += (opt6.ip6e_len + 1) * 8;
4792                                         pd2.proto = opt6.ip6e_nxt;
4793                                         /* goto the next header */
4794                                         break;
4795                                 }
4796                                 default:
4797                                         terminal++;
4798                                         break;
4799                                 }
4800                         } while (!terminal);
4801                         break;
4802 #endif /* INET6 */
4803                 default:
4804                         DPFPRINTF(PF_DEBUG_MISC,
4805                             ("pf: ICMP AF %d unknown (ip6)\n", pd->af));
4806                         return (PF_DROP);
4807                         break;
4808                 }
4809
4810                 switch (pd2.proto) {
4811                 case IPPROTO_TCP: {
4812                         struct tcphdr            th;
4813                         u_int32_t                seq;
4814                         struct pf_state_peer    *src, *dst;
4815                         u_int8_t                 dws;
4816                         int                      copyback = 0;
4817
4818                         /*
4819                          * Only the first 8 bytes of the TCP header can be
4820                          * expected. Don't access any TCP header fields after
4821                          * th_seq, an ackskew test is not possible.
4822                          */
4823                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4824                             pd2.af)) {
4825                                 DPFPRINTF(PF_DEBUG_MISC,
4826                                     ("pf: ICMP error message too short "
4827                                     "(tcp)\n"));
4828                                 return (PF_DROP);
4829                         }
4830
4831                         key.af = pd2.af;
4832                         key.proto = IPPROTO_TCP;
4833                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4834                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4835                         key.port[pd2.sidx] = th.th_sport;
4836                         key.port[pd2.didx] = th.th_dport;
4837
4838                         STATE_LOOKUP(kif, &key, direction, *state, m);
4839
4840                         if (direction == (*state)->direction) {
4841                                 src = &(*state)->dst;
4842                                 dst = &(*state)->src;
4843                         } else {
4844                                 src = &(*state)->src;
4845                                 dst = &(*state)->dst;
4846                         }
4847
4848                         if (src->wscale && dst->wscale)
4849                                 dws = dst->wscale & PF_WSCALE_MASK;
4850                         else
4851                                 dws = 0;
4852
4853                         /* Demodulate sequence number */
4854                         seq = ntohl(th.th_seq) - src->seqdiff;
4855                         if (src->seqdiff) {
4856                                 pf_change_a(&th.th_seq, icmpsum,
4857                                     htonl(seq), 0);
4858                                 copyback = 1;
4859                         }
4860
4861                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4862                             (!SEQ_GEQ(src->seqhi, seq) ||
4863                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4864                                 if (pf_status.debug >= PF_DEBUG_MISC) {
4865                                         kprintf("pf: BAD ICMP %d:%d ",
4866                                             icmptype, pd->hdr.icmp->icmp_code);
4867                                         pf_print_host(pd->src, 0, pd->af);
4868                                         kprintf(" -> ");
4869                                         pf_print_host(pd->dst, 0, pd->af);
4870                                         kprintf(" state: ");
4871                                         pf_print_state(*state);
4872                                         kprintf(" seq=%u\n", seq);
4873                                 }
4874                                 REASON_SET(reason, PFRES_BADSTATE);
4875                                 return (PF_DROP);
4876                         } else {
4877                                 if (pf_status.debug >= PF_DEBUG_MISC) {
4878                                         kprintf("pf: OK ICMP %d:%d ",
4879                                             icmptype, pd->hdr.icmp->icmp_code);
4880                                         pf_print_host(pd->src, 0, pd->af);
4881                                         kprintf(" -> ");
4882                                         pf_print_host(pd->dst, 0, pd->af);
4883                                         kprintf(" state: ");
4884                                         pf_print_state(*state);
4885                                         kprintf(" seq=%u\n", seq);
4886                                 }
4887                         }
4888
4889                         /* translate source/destination address, if necessary */
4890                         if ((*state)->key[PF_SK_WIRE] !=
4891                             (*state)->key[PF_SK_STACK]) {
4892                                 struct pf_state_key *nk =
4893                                     (*state)->key[pd->didx];
4894
4895                                 if (PF_ANEQ(pd2.src,
4896                                     &nk->addr[pd2.sidx], pd2.af) ||
4897                                     nk->port[pd2.sidx] != th.th_sport)
4898                                         pf_change_icmp(pd2.src, &th.th_sport,
4899                                             daddr, &nk->addr[pd2.sidx],
4900                                             nk->port[pd2.sidx], NULL,
4901                                             pd2.ip_sum, icmpsum,
4902                                             pd->ip_sum, 0, pd2.af);
4903
4904                                 if (PF_ANEQ(pd2.dst,
4905                                     &nk->addr[pd2.didx], pd2.af) ||
4906                                     nk->port[pd2.didx] != th.th_dport)
4907                                         pf_change_icmp(pd2.dst, &th.th_dport,
4908                                             NULL, /* XXX Inbound NAT? */
4909                                             &nk->addr[pd2.didx],
4910                                             nk->port[pd2.didx], NULL,
4911                                             pd2.ip_sum, icmpsum,
4912                                             pd->ip_sum, 0, pd2.af);
4913                                 copyback = 1;
4914                         }
4915
4916                         if (copyback) {
4917                                 switch (pd2.af) {
4918 #ifdef INET
4919                                 case AF_INET:
4920                                         m_copyback(m, off, ICMP_MINLEN,
4921                                             (caddr_t)pd->hdr.icmp);
4922                                         m_copyback(m, ipoff2, sizeof(h2),
4923                                             (caddr_t)&h2);
4924                                         break;
4925 #endif /* INET */
4926 #ifdef INET6
4927                                 case AF_INET6:
4928                                         m_copyback(m, off,
4929                                             sizeof(struct icmp6_hdr),
4930                                             (caddr_t)pd->hdr.icmp6);
4931                                         m_copyback(m, ipoff2, sizeof(h2_6),
4932                                             (caddr_t)&h2_6);
4933                                         break;
4934 #endif /* INET6 */
4935                                 }
4936                                 m_copyback(m, off2, 8, (caddr_t)&th);
4937                         }
4938
4939                         return (PF_PASS);
4940                         break;
4941                 }
4942                 case IPPROTO_UDP: {
4943                         struct udphdr           uh;
4944
4945                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4946                             NULL, reason, pd2.af)) {
4947                                 DPFPRINTF(PF_DEBUG_MISC,
4948                                     ("pf: ICMP error message too short "
4949                                     "(udp)\n"));
4950                                 return (PF_DROP);
4951                         }
4952
4953                         key.af = pd2.af;
4954                         key.proto = IPPROTO_UDP;
4955                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4956                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4957                         key.port[pd2.sidx] = uh.uh_sport;
4958                         key.port[pd2.didx] = uh.uh_dport;
4959
4960                         STATE_LOOKUP(kif, &key, direction, *state, m);
4961
4962                         /* translate source/destination address, if necessary */
4963                         if ((*state)->key[PF_SK_WIRE] !=
4964                             (*state)->key[PF_SK_STACK]) {
4965                                 struct pf_state_key *nk =
4966                                     (*state)->key[pd->didx];
4967
4968                                 if (PF_ANEQ(pd2.src,
4969                                     &nk->addr[pd2.sidx], pd2.af) ||
4970                                     nk->port[pd2.sidx] != uh.uh_sport)
4971                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4972                                             daddr, &nk->addr[pd2.sidx],
4973                                             nk->port[pd2.sidx], &uh.uh_sum,
4974                                             pd2.ip_sum, icmpsum,
4975                                             pd->ip_sum, 1, pd2.af);
4976
4977                                 if (PF_ANEQ(pd2.dst,
4978                                     &nk->addr[pd2.didx], pd2.af) ||
4979                                     nk->port[pd2.didx] != uh.uh_dport)
4980                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4981                                             NULL, /* XXX Inbound NAT? */
4982                                             &nk->addr[pd2.didx],
4983                                             nk->port[pd2.didx], &uh.uh_sum,
4984                                             pd2.ip_sum, icmpsum,
4985                                             pd->ip_sum, 1, pd2.af);
4986
4987                                 switch (pd2.af) {
4988 #ifdef INET
4989                                 case AF_INET:
4990                                         m_copyback(m, off, ICMP_MINLEN,
4991                                             (caddr_t)pd->hdr.icmp);
4992                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4993                                         break;
4994 #endif /* INET */
4995 #ifdef INET6
4996                                 case AF_INET6:
4997                                         m_copyback(m, off,
4998                                             sizeof(struct icmp6_hdr),
4999                                             (caddr_t)pd->hdr.icmp6);
5000                                         m_copyback(m, ipoff2, sizeof(h2_6),
5001                                             (caddr_t)&h2_6);
5002                                         break;
5003 #endif /* INET6 */
5004                                 }
5005                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
5006                         }
5007
5008                         return (PF_PASS);
5009                         break;
5010                 }
5011 #ifdef INET
5012                 case IPPROTO_ICMP: {
5013                         struct icmp             iih;
5014
5015                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
5016                             NULL, reason, pd2.af)) {
5017                                 DPFPRINTF(PF_DEBUG_MISC,
5018                                     ("pf: ICMP error message too short i"
5019                                     "(icmp)\n"));
5020                                 return (PF_DROP);
5021                         }
5022
5023                         key.af = pd2.af;
5024                         key.proto = IPPROTO_ICMP;
5025                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5026                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5027                         key.port[0] = key.port[1] = iih.icmp_id;
5028
5029                         STATE_LOOKUP(kif, &key, direction, *state, m);
5030
5031                         /* translate source/destination address, if necessary */
5032                         if ((*state)->key[PF_SK_WIRE] !=
5033                             (*state)->key[PF_SK_STACK]) {
5034                                 struct pf_state_key *nk =
5035                                     (*state)->key[pd->didx];
5036
5037                                 if (PF_ANEQ(pd2.src,
5038                                     &nk->addr[pd2.sidx], pd2.af) ||
5039                                     nk->port[pd2.sidx] != iih.icmp_id)
5040                                         pf_change_icmp(pd2.src, &iih.icmp_id,
5041                                             daddr, &nk->addr[pd2.sidx],
5042                                             nk->port[pd2.sidx], NULL,
5043                                             pd2.ip_sum, icmpsum,
5044                                             pd->ip_sum, 0, AF_INET);
5045
5046                                 if (PF_ANEQ(pd2.dst,
5047                                     &nk->addr[pd2.didx], pd2.af) ||
5048                                     nk->port[pd2.didx] != iih.icmp_id)
5049                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
5050                                             NULL, /* XXX Inbound NAT? */
5051                                             &nk->addr[pd2.didx],
5052                                             nk->port[pd2.didx], NULL,
5053                                             pd2.ip_sum, icmpsum,
5054                                             pd->ip_sum, 0, AF_INET);
5055
5056                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
5057                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5058                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
5059                         }
5060                         return (PF_PASS);
5061                         break;
5062                 }
5063 #endif /* INET */
5064 #ifdef INET6
5065                 case IPPROTO_ICMPV6: {
5066                         struct icmp6_hdr        iih;
5067
5068                         if (!pf_pull_hdr(m, off2, &iih,
5069                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5070                                 DPFPRINTF(PF_DEBUG_MISC,
5071                                     ("pf: ICMP error message too short "
5072                                     "(icmp6)\n"));
5073                                 return (PF_DROP);
5074                         }
5075
5076                         key.af = pd2.af;
5077                         key.proto = IPPROTO_ICMPV6;
5078                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5079                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5080                         key.port[0] = key.port[1] = iih.icmp6_id;
5081
5082                         STATE_LOOKUP(kif, &key, direction, *state, m);
5083
5084                         /* translate source/destination address, if necessary */
5085                         if ((*state)->key[PF_SK_WIRE] !=
5086                             (*state)->key[PF_SK_STACK]) {
5087                                 struct pf_state_key *nk =
5088                                     (*state)->key[pd->didx];
5089
5090                                 if (PF_ANEQ(pd2.src,
5091                                     &nk->addr[pd2.sidx], pd2.af) ||
5092                                     nk->port[pd2.sidx] != iih.icmp6_id)
5093                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
5094                                             daddr, &nk->addr[pd2.sidx],
5095                                             nk->port[pd2.sidx], NULL,
5096                                             pd2.ip_sum, icmpsum,
5097                                             pd->ip_sum, 0, AF_INET6);
5098
5099                                 if (PF_ANEQ(pd2.dst,
5100                                     &nk->addr[pd2.didx], pd2.af) ||
5101                                     nk->port[pd2.didx] != iih.icmp6_id)
5102                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
5103                                             NULL, /* XXX Inbound NAT? */
5104                                             &nk->addr[pd2.didx],
5105                                             nk->port[pd2.didx], NULL,
5106                                             pd2.ip_sum, icmpsum,
5107                                             pd->ip_sum, 0, AF_INET6);
5108
5109                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
5110                                     (caddr_t)pd->hdr.icmp6);
5111                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5112                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5113                                     (caddr_t)&iih);
5114                         }
5115
5116                         return (PF_PASS);
5117                         break;
5118                 }
5119 #endif /* INET6 */
5120                 default: {
5121                         key.af = pd2.af;
5122                         key.proto = pd2.proto;
5123                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5124                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5125                         key.port[0] = key.port[1] = 0;
5126
5127                         STATE_LOOKUP(kif, &key, direction, *state, m);
5128
5129                         /* translate source/destination address, if necessary */
5130                         if ((*state)->key[PF_SK_WIRE] !=
5131                             (*state)->key[PF_SK_STACK]) {
5132                                 struct pf_state_key *nk =
5133                                     (*state)->key[pd->didx];
5134
5135                                 if (PF_ANEQ(pd2.src,
5136                                     &nk->addr[pd2.sidx], pd2.af))
5137                                         pf_change_icmp(pd2.src, NULL, daddr,
5138                                             &nk->addr[pd2.sidx], 0, NULL,
5139                                             pd2.ip_sum, icmpsum,
5140                                             pd->ip_sum, 0, pd2.af);
5141
5142                                 if (PF_ANEQ(pd2.dst,
5143                                     &nk->addr[pd2.didx], pd2.af))
5144                                         pf_change_icmp(pd2.src, NULL,
5145                                             NULL, /* XXX Inbound NAT? */
5146                                             &nk->addr[pd2.didx], 0, NULL,
5147                                             pd2.ip_sum, icmpsum,
5148                                             pd->ip_sum, 0, pd2.af);
5149
5150                                 switch (pd2.af) {
5151 #ifdef INET
5152                                 case AF_INET:
5153                                         m_copyback(m, off, ICMP_MINLEN,
5154                                             (caddr_t)pd->hdr.icmp);
5155                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5156                                         break;
5157 #endif /* INET */
5158 #ifdef INET6
5159                                 case AF_INET6:
5160                                         m_copyback(m, off,
5161                                             sizeof(struct icmp6_hdr),
5162                                             (caddr_t)pd->hdr.icmp6);
5163                                         m_copyback(m, ipoff2, sizeof(h2_6),
5164                                             (caddr_t)&h2_6);
5165                                         break;
5166 #endif /* INET6 */
5167                                 }
5168                         }
5169                         return (PF_PASS);
5170                         break;
5171                 }
5172                 }
5173         }
5174 }
5175
5176 int
5177 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5178     struct mbuf *m, struct pf_pdesc *pd)
5179 {
5180         struct pf_state_peer    *src, *dst;
5181         struct pf_state_key_cmp  key;
5182
5183         key.af = pd->af;
5184         key.proto = pd->proto;
5185         if (direction == PF_IN) {
5186                 PF_ACPY(&key.addr[0], pd->src, key.af);
5187                 PF_ACPY(&key.addr[1], pd->dst, key.af);
5188                 key.port[0] = key.port[1] = 0;
5189         } else {
5190                 PF_ACPY(&key.addr[1], pd->src, key.af);
5191                 PF_ACPY(&key.addr[0], pd->dst, key.af);
5192                 key.port[1] = key.port[0] = 0;
5193         }
5194
5195         STATE_LOOKUP(kif, &key, direction, *state, m);
5196
5197         if (direction == (*state)->direction) {
5198                 src = &(*state)->src;
5199                 dst = &(*state)->dst;
5200         } else {
5201                 src = &(*state)->dst;
5202                 dst = &(*state)->src;
5203         }
5204
5205         /* update states */
5206         if (src->state < PFOTHERS_SINGLE)
5207                 src->state = PFOTHERS_SINGLE;
5208         if (dst->state == PFOTHERS_SINGLE)
5209                 dst->state = PFOTHERS_MULTIPLE;
5210
5211         /* update expire time */
5212         (*state)->expire = time_second;
5213         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5214                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5215         else
5216                 (*state)->timeout = PFTM_OTHER_SINGLE;
5217
5218         /* translate source/destination address, if necessary */
5219         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5220                 struct pf_state_key *nk = (*state)->key[pd->didx];
5221
5222                 KKASSERT(nk);
5223                 KKASSERT(pd);
5224                 KKASSERT(pd->src);
5225                 KKASSERT(pd->dst);
5226                 switch (pd->af) {
5227 #ifdef INET
5228                 case AF_INET:
5229                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5230                                 pf_change_a(&pd->src->v4.s_addr,
5231                                     pd->ip_sum,
5232                                     nk->addr[pd->sidx].v4.s_addr,
5233                                     0);
5234
5235
5236                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5237                                 pf_change_a(&pd->dst->v4.s_addr,
5238                                     pd->ip_sum,
5239                                     nk->addr[pd->didx].v4.s_addr,
5240                                     0);
5241
5242                                 break;
5243 #endif /* INET */
5244 #ifdef INET6
5245                 case AF_INET6:
5246                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5247                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5248
5249                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5250                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5251 #endif /* INET6 */
5252                 }
5253         }
5254         return (PF_PASS);
5255 }
5256
5257 /*
5258  * ipoff and off are measured from the start of the mbuf chain.
5259  * h must be at "ipoff" on the mbuf chain.
5260  */
5261 void *
5262 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5263     u_short *actionp, u_short *reasonp, sa_family_t af)
5264 {
5265         switch (af) {
5266 #ifdef INET
5267         case AF_INET: {
5268                 struct ip       *h = mtod(m, struct ip *);
5269                 u_int16_t        fragoff = (h->ip_off & IP_OFFMASK) << 3;
5270
5271                 if (fragoff) {
5272                         if (fragoff >= len)
5273                                 ACTION_SET(actionp, PF_PASS);
5274                         else {
5275                                 ACTION_SET(actionp, PF_DROP);
5276                                 REASON_SET(reasonp, PFRES_FRAG);
5277                         }
5278                         return (NULL);
5279                 }
5280                 if (m->m_pkthdr.len < off + len ||
5281                     h->ip_len < off + len) {
5282                         ACTION_SET(actionp, PF_DROP);
5283                         REASON_SET(reasonp, PFRES_SHORT);
5284                         return (NULL);
5285                 }
5286                 break;
5287         }
5288 #endif /* INET */
5289 #ifdef INET6
5290         case AF_INET6: {
5291                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
5292
5293                 if (m->m_pkthdr.len < off + len ||
5294                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5295                     (unsigned)(off + len)) {
5296                         ACTION_SET(actionp, PF_DROP);
5297                         REASON_SET(reasonp, PFRES_SHORT);
5298                         return (NULL);
5299                 }
5300                 break;
5301         }
5302 #endif /* INET6 */
5303         }
5304         m_copydata(m, off, len, p);
5305         return (p);
5306 }
5307
5308 int
5309 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif)
5310 {
5311         struct sockaddr_in      *dst;
5312         int                      ret = 1;
5313         int                      check_mpath;
5314 #ifdef INET6
5315         struct sockaddr_in6     *dst6;
5316         struct route_in6         ro;
5317 #else
5318         struct route             ro;
5319 #endif
5320         struct radix_node       *rn;
5321         struct rtentry          *rt;
5322         struct ifnet            *ifp;
5323
5324         check_mpath = 0;
5325         bzero(&ro, sizeof(ro));
5326         switch (af) {
5327         case AF_INET:
5328                 dst = satosin(&ro.ro_dst);
5329                 dst->sin_family = AF_INET;
5330                 dst->sin_len = sizeof(*dst);
5331                 dst->sin_addr = addr->v4;
5332                 break;
5333 #ifdef INET6
5334         case AF_INET6:
5335                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5336                 dst6->sin6_family = AF_INET6;
5337                 dst6->sin6_len = sizeof(*dst6);
5338                 dst6->sin6_addr = addr->v6;
5339                 break;
5340 #endif /* INET6 */
5341         default:
5342                 return (0);
5343         }
5344
5345         /* Skip checks for ipsec interfaces */
5346         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5347                 goto out;
5348
5349         rtalloc_ign((struct route *)&ro, 0);
5350
5351         if (ro.ro_rt != NULL) {
5352                 /* No interface given, this is a no-route check */
5353                 if (kif == NULL)
5354                         goto out;
5355
5356                 if (kif->pfik_ifp == NULL) {
5357                         ret = 0;
5358                         goto out;
5359                 }
5360
5361                 /* Perform uRPF check if passed input interface */
5362                 ret = 0;
5363                 rn = (struct radix_node *)ro.ro_rt;
5364                 do {
5365                         rt = (struct rtentry *)rn;
5366                         ifp = rt->rt_ifp;
5367
5368                         if (kif->pfik_ifp == ifp)
5369                                 ret = 1;
5370                         rn = NULL;
5371                 } while (check_mpath == 1 && rn != NULL && ret == 0);
5372         } else
5373                 ret = 0;
5374 out:
5375         if (ro.ro_rt != NULL)
5376                 RTFREE(ro.ro_rt);
5377         return (ret);
5378 }
5379
5380 int
5381 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw)
5382 {
5383         struct sockaddr_in      *dst;
5384 #ifdef INET6
5385         struct sockaddr_in6     *dst6;
5386         struct route_in6         ro;
5387 #else
5388         struct route             ro;
5389 #endif
5390         int                      ret = 0;
5391
5392         ASSERT_LWKT_TOKEN_HELD(&pf_token);
5393
5394         bzero(&ro, sizeof(ro));
5395         switch (af) {
5396         case AF_INET:
5397                 dst = satosin(&ro.ro_dst);
5398                 dst->sin_family = AF_INET;
5399                 dst->sin_len = sizeof(*dst);
5400                 dst->sin_addr = addr->v4;
5401                 break;
5402 #ifdef INET6
5403         case AF_INET6:
5404                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5405                 dst6->sin6_family = AF_INET6;
5406                 dst6->sin6_len = sizeof(*dst6);
5407                 dst6->sin6_addr = addr->v6;
5408                 break;
5409 #endif /* INET6 */
5410         default:
5411                 return (0);
5412         }
5413
5414 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING));
5415
5416         if (ro.ro_rt != NULL) {
5417                 RTFREE(ro.ro_rt);
5418         }
5419
5420         return (ret);
5421 }
5422
5423 #ifdef INET
5424 void
5425 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5426     struct pf_state *s, struct pf_pdesc *pd)
5427 {
5428         struct mbuf             *m0, *m1;
5429         struct route             iproute;
5430         struct route            *ro = NULL;
5431         struct sockaddr_in      *dst;
5432         struct ip               *ip;
5433         struct ifnet            *ifp = NULL;
5434         struct pf_addr           naddr;
5435         struct pf_src_node      *sn = NULL;
5436         int                      error = 0;
5437         int sw_csum;
5438 #ifdef IPSEC
5439         struct m_tag            *mtag;
5440 #endif /* IPSEC */
5441
5442         ASSERT_LWKT_TOKEN_HELD(&pf_token);
5443
5444         if (m == NULL || *m == NULL || r == NULL ||
5445             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5446                 panic("pf_route: invalid parameters");
5447
5448         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5449                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5450                 (*m)->m_pkthdr.pf.routed = 1;
5451         } else {
5452                 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5453                         m0 = *m;
5454                         *m = NULL;
5455                         goto bad;
5456                 }
5457         }
5458
5459         if (r->rt == PF_DUPTO) {
5460                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) {
5461                         return;
5462                 }
5463         } else {
5464                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5465                         return;
5466                 }
5467                 m0 = *m;
5468         }
5469
5470         if (m0->m_len < sizeof(struct ip)) {
5471                 DPFPRINTF(PF_DEBUG_URGENT,
5472                     ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5473                 goto bad;
5474         }
5475
5476         ip = mtod(m0, struct ip *);
5477
5478         ro = &iproute;
5479         bzero((caddr_t)ro, sizeof(*ro));
5480         dst = satosin(&ro->ro_dst);
5481         dst->sin_family = AF_INET;
5482         dst->sin_len = sizeof(*dst);
5483         dst->sin_addr = ip->ip_dst;
5484
5485         if (r->rt == PF_FASTROUTE) {
5486                 rtalloc(ro);
5487                 if (ro->ro_rt == 0) {
5488                         ipstat.ips_noroute++;
5489                         goto bad;
5490                 }
5491
5492                 ifp = ro->ro_rt->rt_ifp;
5493                 ro->ro_rt->rt_use++;
5494
5495                 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
5496                         dst = satosin(ro->ro_rt->rt_gateway);
5497         } else {
5498                 if (TAILQ_EMPTY(&r->rpool.list)) {
5499                         DPFPRINTF(PF_DEBUG_URGENT,
5500                             ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
5501                         goto bad;
5502                 }
5503                 if (s == NULL) {
5504                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5505                             &naddr, NULL, &sn);
5506                         if (!PF_AZERO(&naddr, AF_INET))
5507                                 dst->sin_addr.s_addr = naddr.v4.s_addr;
5508                         ifp = r->rpool.cur->kif ?
5509                             r->rpool.cur->kif->pfik_ifp : NULL;
5510                 } else {
5511                         if (!PF_AZERO(&s->rt_addr, AF_INET))
5512                                 dst->sin_addr.s_addr =
5513                                     s->rt_addr.v4.s_addr;
5514                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5515                 }
5516         }
5517         if (ifp == NULL)
5518                 goto bad;
5519
5520         if (oifp != ifp) {
5521                 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5522                         goto bad;
5523                 } else if (m0 == NULL) {
5524                         goto done;
5525                 }
5526                 if (m0->m_len < sizeof(struct ip)) {
5527                         DPFPRINTF(PF_DEBUG_URGENT,
5528                             ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5529                         goto bad;
5530                 }
5531                 ip = mtod(m0, struct ip *);
5532         }
5533
5534         /* Copied from FreeBSD 5.1-CURRENT ip_output. */
5535         m0->m_pkthdr.csum_flags |= CSUM_IP;
5536         sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
5537         if (sw_csum & CSUM_DELAY_DATA) {
5538                 in_delayed_cksum(m0);
5539                 sw_csum &= ~CSUM_DELAY_DATA;
5540         }
5541         m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
5542
5543         if (ip->ip_len <= ifp->if_mtu ||
5544             (ifp->if_hwassist & CSUM_FRAGMENT &&
5545                 (ip->ip_off & IP_DF) == 0)) {
5546                 ip->ip_len = htons(ip->ip_len);
5547                 ip->ip_off = htons(ip->ip_off);
5548                 ip->ip_sum = 0;
5549                 if (sw_csum & CSUM_DELAY_IP) {
5550                         /* From KAME */
5551                         if (ip->ip_v == IPVERSION &&
5552                             (ip->ip_hl << 2) == sizeof(*ip)) {
5553                                 ip->ip_sum = in_cksum_hdr(ip);
5554                         } else {
5555                                 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5556                         }
5557                 }
5558                 lwkt_reltoken(&pf_token);
5559                 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt);
5560                 lwkt_gettoken(&pf_token);
5561                 goto done;
5562         }
5563
5564         /*
5565          * Too large for interface; fragment if possible.
5566          * Must be able to put at least 8 bytes per fragment.
5567          */
5568         if (ip->ip_off & IP_DF) {
5569                 ipstat.ips_cantfrag++;
5570                 if (r->rt != PF_DUPTO) {
5571                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5572                             ifp->if_mtu);
5573                         goto done;
5574                 } else
5575                         goto bad;
5576         }
5577
5578         m1 = m0;
5579         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5580         if (error) {
5581                 goto bad;
5582         }
5583
5584         for (m0 = m1; m0; m0 = m1) {
5585                 m1 = m0->m_nextpkt;
5586                 m0->m_nextpkt = 0;
5587                 if (error == 0) {
5588                         lwkt_reltoken(&pf_token);
5589                         error = (*ifp->if_output)(ifp, m0, sintosa(dst),
5590                                                   NULL);
5591                         lwkt_gettoken(&pf_token);
5592                 } else
5593                         m_freem(m0);
5594         }
5595
5596         if (error == 0)
5597                 ipstat.ips_fragmented++;
5598
5599 done:
5600         if (r->rt != PF_DUPTO)
5601                 *m = NULL;
5602         if (ro == &iproute && ro->ro_rt)
5603                 RTFREE(ro->ro_rt);
5604         return;
5605
5606 bad:
5607         m_freem(m0);
5608         goto done;
5609 }
5610 #endif /* INET */
5611
5612 #ifdef INET6
5613 void
5614 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5615     struct pf_state *s, struct pf_pdesc *pd)
5616 {
5617         struct mbuf             *m0;
5618         struct route_in6         ip6route;
5619         struct route_in6        *ro;
5620         struct sockaddr_in6     *dst;
5621         struct ip6_hdr          *ip6;
5622         struct ifnet            *ifp = NULL;
5623         struct pf_addr           naddr;
5624         struct pf_src_node      *sn = NULL;
5625         int                      error = 0;
5626
5627         if (m == NULL || *m == NULL || r == NULL ||
5628             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5629                 panic("pf_route6: invalid parameters");
5630
5631         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5632                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5633                 (*m)->m_pkthdr.pf.routed = 1;
5634         } else {
5635                 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5636                         m0 = *m;
5637                         *m = NULL;
5638                         goto bad;
5639                 }
5640         }
5641
5642         if (r->rt == PF_DUPTO) {
5643                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5644                         return;
5645         } else {
5646                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5647                         return;
5648                 m0 = *m;
5649         }
5650
5651         if (m0->m_len < sizeof(struct ip6_hdr)) {
5652                 DPFPRINTF(PF_DEBUG_URGENT,
5653                     ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5654                 goto bad;
5655         }
5656         ip6 = mtod(m0, struct ip6_hdr *);
5657
5658         ro = &ip6route;
5659         bzero((caddr_t)ro, sizeof(*ro));
5660         dst = (struct sockaddr_in6 *)&ro->ro_dst;
5661         dst->sin6_family = AF_INET6;
5662         dst->sin6_len = sizeof(*dst);
5663         dst->sin6_addr = ip6->ip6_dst;
5664
5665         /*
5666          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
5667          * so make sure pf.flags is clear.
5668          *
5669          * Cheat. XXX why only in the v6 case???
5670          */
5671         if (r->rt == PF_FASTROUTE) {
5672                 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
5673                 m0->m_pkthdr.pf.flags = 0;
5674                 /* XXX Re-Check when Upgrading to > 4.4 */
5675                 m0->m_pkthdr.pf.statekey = NULL;
5676                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5677                 return;
5678         }
5679
5680         if (TAILQ_EMPTY(&r->rpool.list)) {
5681                 DPFPRINTF(PF_DEBUG_URGENT,
5682                     ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
5683                 goto bad;
5684         }
5685         if (s == NULL) {
5686                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5687                     &naddr, NULL, &sn);
5688                 if (!PF_AZERO(&naddr, AF_INET6))
5689                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5690                             &naddr, AF_INET6);
5691                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5692         } else {
5693                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5694                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5695                             &s->rt_addr, AF_INET6);
5696                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5697         }
5698         if (ifp == NULL)
5699                 goto bad;
5700
5701         if (oifp != ifp) {
5702                 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5703                         goto bad;
5704                 } else if (m0 == NULL) {
5705                         goto done;
5706                 }
5707                 if (m0->m_len < sizeof(struct ip6_hdr)) {
5708                         DPFPRINTF(PF_DEBUG_URGENT,
5709                             ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5710                         goto bad;
5711                 }
5712                 ip6 = mtod(m0, struct ip6_hdr *);
5713         }
5714
5715         /*
5716          * If the packet is too large for the outgoing interface,
5717          * send back an icmp6 error.
5718          */
5719         if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5720                 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5721         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5722                 error = nd6_output(ifp, ifp, m0, dst, NULL);
5723         } else {
5724                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5725                 if (r->rt != PF_DUPTO)
5726                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5727                 else
5728                         goto bad;
5729         }
5730
5731 done:
5732         if (r->rt != PF_DUPTO)
5733                 *m = NULL;
5734         return;
5735
5736 bad:
5737         m_freem(m0);
5738         goto done;
5739 }
5740 #endif /* INET6 */
5741
5742
5743 /*
5744  * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5745  *   off is the offset where the protocol header starts
5746  *   len is the total length of protocol header plus payload
5747  * returns 0 when the checksum is valid, otherwise returns 1.
5748  */
5749 /*
5750  * XXX
5751  * FreeBSD supports cksum offload for the following drivers.
5752  * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5753  * If we can make full use of it we would outperform ipfw/ipfilter in
5754  * very heavy traffic.
5755  * I have not tested 'cause I don't have NICs that supports cksum offload.
5756  * (There might be problems. Typical phenomena would be
5757  *   1. No route message for UDP packet.
5758  *   2. No connection acceptance from external hosts regardless of rule set.)
5759  */
5760 int
5761 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5762     sa_family_t af)
5763 {
5764         u_int16_t sum = 0;
5765         int hw_assist = 0;
5766         struct ip *ip;
5767
5768         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5769                 return (1);
5770         if (m->m_pkthdr.len < off + len)
5771                 return (1);
5772
5773         switch (p) {
5774         case IPPROTO_TCP:
5775         case IPPROTO_UDP:
5776                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5777                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5778                                 sum = m->m_pkthdr.csum_data;
5779                         } else {
5780                                 ip = mtod(m, struct ip *);
5781                                 sum = in_pseudo(ip->ip_src.s_addr,
5782                                         ip->ip_dst.s_addr, htonl((u_short)len +
5783                                         m->m_pkthdr.csum_data + p));
5784                         }
5785                         sum ^= 0xffff;
5786                         ++hw_assist;
5787                 }
5788                 break;
5789         case IPPROTO_ICMP:
5790 #ifdef INET6
5791         case IPPROTO_ICMPV6:
5792 #endif /* INET6 */
5793                 break;
5794         default:
5795                 return (1);
5796         }
5797
5798         if (!hw_assist) {
5799                 switch (af) {
5800                 case AF_INET:
5801                         if (p == IPPROTO_ICMP) {
5802                                 if (m->m_len < off)
5803                                         return (1);
5804                                 m->m_data += off;
5805                                 m->m_len -= off;
5806                                 sum = in_cksum(m, len);
5807                                 m->m_data -= off;
5808                                 m->m_len += off;
5809                         } else {
5810                                 if (m->m_len < sizeof(struct ip))
5811                                         return (1);
5812                                 sum = in_cksum_range(m, p, off, len);
5813                                 if (sum == 0) {
5814                                         m->m_pkthdr.csum_flags |=
5815                                             (CSUM_DATA_VALID |
5816                                              CSUM_PSEUDO_HDR);
5817                                         m->m_pkthdr.csum_data = 0xffff;
5818                                 }
5819                         }
5820                         break;
5821 #ifdef INET6
5822                 case AF_INET6:
5823                         if (m->m_len < sizeof(struct ip6_hdr))
5824                                 return (1);
5825                         sum = in6_cksum(m, p, off, len);
5826                         /*
5827                          * XXX
5828                          * IPv6 H/W cksum off-load not supported yet!
5829                          *
5830                          * if (sum == 0) {
5831                          *      m->m_pkthdr.csum_flags |=
5832                          *          (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5833                          *      m->m_pkthdr.csum_data = 0xffff;
5834                          *}
5835                          */
5836                         break;
5837 #endif /* INET6 */
5838                 default:
5839                         return (1);
5840                 }
5841         }
5842         if (sum) {
5843                 switch (p) {
5844                 case IPPROTO_TCP:
5845                         tcpstat.tcps_rcvbadsum++;
5846                         break;
5847                 case IPPROTO_UDP:
5848                         udpstat.udps_badsum++;
5849                         break;
5850                 case IPPROTO_ICMP:
5851                         icmpstat.icps_checksum++;
5852                         break;
5853 #ifdef INET6
5854                 case IPPROTO_ICMPV6:
5855                         icmp6stat.icp6s_checksum++;
5856                         break;
5857 #endif /* INET6 */
5858                 }
5859                 return (1);
5860         }
5861         return (0);
5862 }
5863
5864 struct pf_divert *
5865 pf_find_divert(struct mbuf *m)
5866 {
5867         struct m_tag    *mtag;
5868
5869         if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL)
5870                 return (NULL);
5871
5872         return ((struct pf_divert *)(mtag + 1));
5873 }
5874
5875 struct pf_divert *
5876 pf_get_divert(struct mbuf *m)
5877 {
5878         struct m_tag    *mtag;
5879
5880         if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) {
5881                 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert),
5882                     M_NOWAIT);
5883                 if (mtag == NULL)
5884                         return (NULL);
5885                 bzero(mtag + 1, sizeof(struct pf_divert));
5886                 m_tag_prepend(m, mtag);
5887         }
5888
5889         return ((struct pf_divert *)(mtag + 1));
5890 }
5891
5892 #ifdef INET
5893 int
5894 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
5895     struct ether_header *eh, struct inpcb *inp)
5896 {
5897         struct pfi_kif          *kif;
5898         u_short                  action, reason = 0, log = 0;
5899         struct mbuf             *m = *m0;
5900         struct ip               *h = NULL;
5901         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
5902         struct pf_state         *s = NULL;
5903         struct pf_ruleset       *ruleset = NULL;
5904         struct pf_pdesc          pd;
5905         int                      off, dirndx, pqid = 0;
5906
5907         if (!pf_status.running)
5908                 return (PF_PASS);
5909
5910         memset(&pd, 0, sizeof(pd));
5911         if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
5912                 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
5913         else
5914                 kif = (struct pfi_kif *)ifp->if_pf_kif;
5915
5916         if (kif == NULL) {
5917                 DPFPRINTF(PF_DEBUG_URGENT,
5918                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5919                 return (PF_DROP);
5920         }
5921         if (kif->pfik_flags & PFI_IFLAG_SKIP)
5922                 return (PF_PASS);
5923
5924 #ifdef DIAGNOSTIC
5925         if ((m->m_flags & M_PKTHDR) == 0)
5926                 panic("non-M_PKTHDR is passed to pf_test");
5927 #endif /* DIAGNOSTIC */
5928
5929         if (m->m_pkthdr.len < (int)sizeof(*h)) {
5930                 action = PF_DROP;
5931                 REASON_SET(&reason, PFRES_SHORT);
5932                 log = 1;
5933                 goto done;
5934         }
5935
5936         /*
5937          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
5938          * so make sure pf.flags is clear.
5939          */
5940         if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
5941                 return (PF_PASS);
5942         m->m_pkthdr.pf.flags = 0;
5943         /* Re-Check when updating to > 4.4 */
5944         m->m_pkthdr.pf.statekey = NULL;
5945
5946         /* We do IP header normalization and packet reassembly here */
5947         if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5948                 action = PF_DROP;
5949                 goto done;
5950         }
5951         m = *m0;        /* pf_normalize messes with m0 */
5952         h = mtod(m, struct ip *);
5953
5954         off = h->ip_hl << 2;
5955         if (off < (int)sizeof(*h)) {
5956                 action = PF_DROP;
5957                 REASON_SET(&reason, PFRES_SHORT);
5958                 log = 1;
5959                 goto done;
5960         }
5961
5962         pd.src = (struct pf_addr *)&h->ip_src;
5963         pd.dst = (struct pf_addr *)&h->ip_dst;
5964         pd.sport = pd.dport = NULL;
5965         pd.ip_sum = &h->ip_sum;
5966         pd.proto_sum = NULL;
5967         pd.proto = h->ip_p;
5968         pd.dir = dir;
5969         pd.sidx = (dir == PF_IN) ? 0 : 1;
5970         pd.didx = (dir == PF_IN) ? 1 : 0;
5971         pd.af = AF_INET;
5972         pd.tos = h->ip_tos;
5973         pd.tot_len = h->ip_len;
5974         pd.eh = eh;
5975
5976         /* handle fragments that didn't get reassembled by normalization */
5977         if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5978                 action = pf_test_fragment(&r, dir, kif, m, h,
5979                     &pd, &a, &ruleset);
5980                 goto done;
5981         }
5982
5983         switch (h->ip_p) {
5984
5985         case IPPROTO_TCP: {
5986                 struct tcphdr   th;
5987
5988                 pd.hdr.tcp = &th;
5989                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5990                     &action, &reason, AF_INET)) {
5991                         log = action != PF_PASS;
5992                         goto done;
5993                 }
5994                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5995                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5996                         pqid = 1;
5997                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5998                 if (action == PF_DROP)
5999                         goto done;
6000                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6001                     &reason);
6002                 if (action == PF_PASS) {
6003                         pfsync_update_state(s);
6004                         r = s->rule.ptr;
6005                         a = s->anchor.ptr;
6006                         log = s->log;
6007                 } else if (s == NULL)
6008                         action = pf_test_rule(&r, &s, dir, kif,
6009                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6010                 break;
6011         }
6012
6013         case IPPROTO_UDP: {
6014                 struct udphdr   uh;
6015
6016                 pd.hdr.udp = &uh;
6017                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6018                     &action, &reason, AF_INET)) {
6019                         log = action != PF_PASS;
6020                         goto done;
6021                 }
6022                 if (uh.uh_dport == 0 ||
6023                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6024                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6025                         action = PF_DROP;
6026                         REASON_SET(&reason, PFRES_SHORT);
6027                         goto done;
6028                 }
6029                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6030                 if (action == PF_PASS) {
6031                         pfsync_update_state(s);
6032                         r = s->rule.ptr;
6033                         a = s->anchor.ptr;
6034                         log = s->log;
6035                 } else if (s == NULL)
6036                         action = pf_test_rule(&r, &s, dir, kif,
6037                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6038                 break;
6039         }
6040
6041         case IPPROTO_ICMP: {
6042                 struct icmp     ih;
6043
6044                 pd.hdr.icmp = &ih;
6045                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
6046                     &action, &reason, AF_INET)) {
6047                         log = action != PF_PASS;
6048                         goto done;
6049                 }
6050                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
6051                     &reason);
6052                 if (action == PF_PASS) {
6053                         pfsync_update_state(s);
6054                         r = s->rule.ptr;
6055                         a = s->anchor.ptr;
6056                         log = s->log;
6057                 } else if (s == NULL)
6058                         action = pf_test_rule(&r, &s, dir, kif,
6059                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6060                 break;
6061         }
6062
6063         default:
6064                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6065                 if (action == PF_PASS) {
6066                         pfsync_update_state(s);
6067                         r = s->rule.ptr;
6068                         a = s->anchor.ptr;
6069                         log = s->log;
6070                 } else if (s == NULL)
6071                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6072                             &pd, &a, &ruleset, NULL, inp);
6073                 break;
6074         }
6075
6076 done:
6077         if (action == PF_PASS && h->ip_hl > 5 &&
6078             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6079                 action = PF_DROP;
6080                 REASON_SET(&reason, PFRES_IPOPTIONS);
6081                 log = 1;
6082                 DPFPRINTF(PF_DEBUG_MISC,
6083                     ("pf: dropping packet with ip options\n"));
6084         }
6085
6086         if ((s && s->tag) || r->rtableid)
6087                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6088
6089 #if 0
6090         if (dir == PF_IN && s && s->key[PF_SK_STACK])
6091                 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
6092 #endif
6093
6094 #ifdef ALTQ
6095         if (action == PF_PASS && r->qid) {
6096                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
6097                 if (pqid || (pd.tos & IPTOS_LOWDELAY))
6098                         m->m_pkthdr.pf.qid = r->pqid;
6099                 else
6100                         m->m_pkthdr.pf.qid = r->qid;
6101                 m->m_pkthdr.pf.ecn_af = AF_INET;
6102                 m->m_pkthdr.pf.hdr = h;
6103                 /* add connection hash for fairq */
6104                 if (s) {
6105                         /* for fairq */
6106                         m->m_pkthdr.pf.state_hash = s->hash;
6107                         m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
6108                 }
6109         }
6110 #endif /* ALTQ */
6111
6112         /*
6113          * connections redirected to loopback should not match sockets
6114          * bound specifically to loopback due to security implications,
6115          * see tcp_input() and in_pcblookup_listen().
6116          */
6117         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6118             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6119             (s->nat_rule.ptr->action == PF_RDR ||
6120             s->nat_rule.ptr->action == PF_BINAT) &&
6121             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
6122                 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
6123
6124         if (dir == PF_IN && action == PF_PASS && r->divert.port) {
6125                 struct pf_divert *divert;
6126
6127                 if ((divert = pf_get_divert(m))) {
6128                         m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
6129                         divert->port = r->divert.port;
6130                         divert->addr.ipv4 = r->divert.addr.v4;
6131                 }
6132         }
6133
6134         if (log) {
6135                 struct pf_rule *lr;
6136
6137                 if (s != NULL && s->nat_rule.ptr != NULL &&
6138                     s->nat_rule.ptr->log & PF_LOG_ALL)
6139                         lr = s->nat_rule.ptr;
6140                 else
6141                         lr = r;
6142                 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset,
6143                     &pd);
6144         }
6145
6146         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6147         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6148
6149         if (action == PF_PASS || r->action == PF_DROP) {
6150                 dirndx = (dir == PF_OUT);
6151                 r->packets[dirndx]++;
6152                 r->bytes[dirndx] += pd.tot_len;
6153                 if (a != NULL) {
6154                         a->packets[dirndx]++;
6155                         a->bytes[dirndx] += pd.tot_len;
6156                 }
6157                 if (s != NULL) {
6158                         if (s->nat_rule.ptr != NULL) {
6159                                 s->nat_rule.ptr->packets[dirndx]++;
6160                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6161                         }
6162                         if (s->src_node != NULL) {
6163                                 s->src_node->packets[dirndx]++;
6164                                 s->src_node->bytes[dirndx] += pd.tot_len;
6165                         }
6166                         if (s->nat_src_node != NULL) {
6167                                 s->nat_src_node->packets[dirndx]++;
6168                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6169                         }
6170                         dirndx = (dir == s->direction) ? 0 : 1;
6171                         s->packets[dirndx]++;
6172                         s->bytes[dirndx] += pd.tot_len;
6173                 }
6174                 tr = r;
6175                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6176                 if (nr != NULL && r == &pf_default_rule)
6177                         tr = nr;
6178                 if (tr->src.addr.type == PF_ADDR_TABLE)
6179                         pfr_update_stats(tr->src.addr.p.tbl,
6180                             (s == NULL) ? pd.src :
6181                             &s->key[(s->direction == PF_IN)]->
6182                                 addr[(s->direction == PF_OUT)],
6183                             pd.af, pd.tot_len, dir == PF_OUT,
6184                             r->action == PF_PASS, tr->src.neg);
6185                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6186                         pfr_update_stats(tr->dst.addr.p.tbl,
6187                             (s == NULL) ? pd.dst :
6188                             &s->key[(s->direction == PF_IN)]->
6189                                 addr[(s->direction == PF_IN)],
6190                             pd.af, pd.tot_len, dir == PF_OUT,
6191                             r->action == PF_PASS, tr->dst.neg);
6192         }
6193
6194
6195         if (action == PF_SYNPROXY_DROP) {
6196                 m_freem(*m0);
6197                 *m0 = NULL;
6198                 action = PF_PASS;
6199         } else if (r->rt)
6200                 /* pf_route can free the mbuf causing *m0 to become NULL */
6201                 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
6202
6203         return (action);
6204 }
6205 #endif /* INET */
6206
6207 #ifdef INET6
6208 int
6209 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
6210     struct ether_header *eh, struct inpcb *inp)
6211 {
6212         struct pfi_kif          *kif;
6213         u_short                  action, reason = 0, log = 0;
6214         struct mbuf             *m = *m0, *n = NULL;
6215         struct ip6_hdr          *h = NULL;
6216         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
6217         struct pf_state         *s = NULL;
6218         struct pf_ruleset       *ruleset = NULL;
6219         struct pf_pdesc          pd;
6220         int                      off, terminal = 0, dirndx, rh_cnt = 0;
6221
6222         if (!pf_status.running)
6223                 return (PF_PASS);
6224
6225         memset(&pd, 0, sizeof(pd));
6226         if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
6227                 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
6228         else
6229                 kif = (struct pfi_kif *)ifp->if_pf_kif;
6230
6231         if (kif == NULL) {
6232                 DPFPRINTF(PF_DEBUG_URGENT,
6233                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6234                 return (PF_DROP);
6235         }
6236         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6237                 return (PF_PASS);
6238
6239 #ifdef DIAGNOSTIC
6240         if ((m->m_flags & M_PKTHDR) == 0)
6241                 panic("non-M_PKTHDR is passed to pf_test6");
6242 #endif /* DIAGNOSTIC */
6243
6244         if (m->m_pkthdr.len < (int)sizeof(*h)) {
6245                 action = PF_DROP;
6246                 REASON_SET(&reason, PFRES_SHORT);
6247                 log = 1;
6248                 goto done;
6249         }
6250
6251         /*
6252          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
6253          * so make sure pf.flags is clear.
6254          */
6255         if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
6256                 return (PF_PASS);
6257         m->m_pkthdr.pf.flags = 0;
6258         /* Re-Check when updating to > 4.4 */
6259         m->m_pkthdr.pf.statekey = NULL;
6260
6261         /* We do IP header normalization and packet reassembly here */
6262         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6263                 action = PF_DROP;
6264                 goto done;
6265         }
6266         m = *m0;        /* pf_normalize messes with m0 */
6267         h = mtod(m, struct ip6_hdr *);
6268
6269 #if 1
6270         /*
6271          * we do not support jumbogram yet.  if we keep going, zero ip6_plen
6272          * will do something bad, so drop the packet for now.
6273          */
6274         if (htons(h->ip6_plen) == 0) {
6275                 action = PF_DROP;
6276                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
6277                 goto done;
6278         }
6279 #endif
6280
6281         pd.src = (struct pf_addr *)&h->ip6_src;
6282         pd.dst = (struct pf_addr *)&h->ip6_dst;
6283         pd.sport = pd.dport = NULL;
6284         pd.ip_sum = NULL;
6285         pd.proto_sum = NULL;
6286         pd.dir = dir;
6287         pd.sidx = (dir == PF_IN) ? 0 : 1;
6288         pd.didx = (dir == PF_IN) ? 1 : 0;
6289         pd.af = AF_INET6;
6290         pd.tos = 0;
6291         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6292         pd.eh = eh;
6293
6294         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6295         pd.proto = h->ip6_nxt;
6296         do {
6297                 switch (pd.proto) {
6298                 case IPPROTO_FRAGMENT:
6299                         action = pf_test_fragment(&r, dir, kif, m, h,
6300                             &pd, &a, &ruleset);
6301                         if (action == PF_DROP)
6302                                 REASON_SET(&reason, PFRES_FRAG);
6303                         goto done;
6304                 case IPPROTO_ROUTING: {
6305                         struct ip6_rthdr rthdr;
6306
6307                         if (rh_cnt++) {
6308                                 DPFPRINTF(PF_DEBUG_MISC,
6309                                     ("pf: IPv6 more than one rthdr\n"));
6310                                 action = PF_DROP;
6311                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6312                                 log = 1;
6313                                 goto done;
6314                         }
6315                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6316                             &reason, pd.af)) {
6317                                 DPFPRINTF(PF_DEBUG_MISC,
6318                                     ("pf: IPv6 short rthdr\n"));
6319                                 action = PF_DROP;
6320                                 REASON_SET(&reason, PFRES_SHORT);
6321                                 log = 1;
6322                                 goto done;
6323                         }
6324                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6325                                 DPFPRINTF(PF_DEBUG_MISC,
6326                                     ("pf: IPv6 rthdr0\n"));
6327                                 action = PF_DROP;
6328                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6329                                 log = 1;
6330                                 goto done;
6331                         }
6332                         /* FALLTHROUGH */
6333                 }
6334                 case IPPROTO_AH:
6335                 case IPPROTO_HOPOPTS:
6336                 case IPPROTO_DSTOPTS: {
6337                         /* get next header and header length */
6338                         struct ip6_ext  opt6;
6339
6340                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6341                             NULL, &reason, pd.af)) {
6342                                 DPFPRINTF(PF_DEBUG_MISC,
6343                                     ("pf: IPv6 short opt\n"));
6344                                 action = PF_DROP;
6345                                 log = 1;
6346                                 goto done;
6347                         }
6348                         if (pd.proto == IPPROTO_AH)
6349                                 off += (opt6.ip6e_len + 2) * 4;
6350                         else
6351                                 off += (opt6.ip6e_len + 1) * 8;
6352                         pd.proto = opt6.ip6e_nxt;
6353                         /* goto the next header */
6354                         break;
6355                 }
6356                 default:
6357                         terminal++;
6358                         break;
6359                 }
6360         } while (!terminal);
6361
6362         /* if there's no routing header, use unmodified mbuf for checksumming */
6363         if (!n)
6364                 n = m;
6365
6366         switch (pd.proto) {
6367
6368         case IPPROTO_TCP: {
6369                 struct tcphdr   th;
6370
6371                 pd.hdr.tcp = &th;
6372                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6373                     &action, &reason, AF_INET6)) {
6374                         log = action != PF_PASS;
6375                         goto done;
6376                 }
6377                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6378                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6379                 if (action == PF_DROP)
6380                         goto done;
6381                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6382                     &reason);
6383                 if (action == PF_PASS) {
6384                         pfsync_update_state(s);
6385                         r = s->rule.ptr;
6386                         a = s->anchor.ptr;
6387                         log = s->log;
6388                 } else if (s == NULL)
6389                         action = pf_test_rule(&r, &s, dir, kif,
6390                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6391                 break;
6392         }
6393
6394         case IPPROTO_UDP: {
6395                 struct udphdr   uh;
6396
6397                 pd.hdr.udp = &uh;
6398                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6399                     &action, &reason, AF_INET6)) {
6400                         log = action != PF_PASS;
6401                         goto done;
6402                 }
6403                 if (uh.uh_dport == 0 ||
6404                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6405                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6406                         action = PF_DROP;
6407                         REASON_SET(&reason, PFRES_SHORT);
6408                         goto done;
6409                 }
6410                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6411                 if (action == PF_PASS) {
6412                         pfsync_update_state(s);
6413                         r = s->rule.ptr;
6414                         a = s->anchor.ptr;
6415                         log = s->log;
6416                 } else if (s == NULL)
6417                         action = pf_test_rule(&r, &s, dir, kif,
6418                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6419                 break;
6420         }
6421
6422         case IPPROTO_ICMPV6: {
6423                 struct icmp6_hdr        ih;
6424
6425                 pd.hdr.icmp6 = &ih;
6426                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6427                     &action, &reason, AF_INET6)) {
6428                         log = action != PF_PASS;
6429                         goto done;
6430                 }
6431                 action = pf_test_state_icmp(&s, dir, kif,
6432                     m, off, h, &pd, &reason);
6433                 if (action == PF_PASS) {
6434                         pfsync_update_state(s);
6435                         r = s->rule.ptr;
6436                         a = s->anchor.ptr;
6437                         log = s->log;
6438                 } else if (s == NULL)
6439                         action = pf_test_rule(&r, &s, dir, kif,
6440                             m, off, h, &pd, &a, &ruleset, NULL, inp);
6441                 break;
6442         }
6443
6444         default:
6445                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6446                 if (action == PF_PASS) {
6447                         pfsync_update_state(s);
6448                         r = s->rule.ptr;
6449                         a = s->anchor.ptr;
6450                         log = s->log;
6451                 } else if (s == NULL)
6452                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6453                             &pd, &a, &ruleset, NULL, inp);
6454                 break;
6455         }
6456
6457 done:
6458         if (n != m) {
6459                 m_freem(n);
6460                 n = NULL;
6461         }
6462
6463         /* handle dangerous IPv6 extension headers. */
6464         if (action == PF_PASS && rh_cnt &&
6465             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6466                 action = PF_DROP;
6467                 REASON_SET(&reason, PFRES_IPOPTIONS);
6468                 log = 1;
6469                 DPFPRINTF(PF_DEBUG_MISC,
6470                     ("pf: dropping packet with dangerous v6 headers\n"));
6471         }
6472
6473         if ((s && s->tag) || r->rtableid)
6474                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6475
6476 #if 0
6477         if (dir == PF_IN && s && s->key[PF_SK_STACK])
6478                 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
6479 #endif
6480
6481 #ifdef ALTQ
6482         if (action == PF_PASS && r->qid) {
6483                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
6484                 if (pd.tos & IPTOS_LOWDELAY)
6485                         m->m_pkthdr.pf.qid = r->pqid;
6486                 else
6487                         m->m_pkthdr.pf.qid = r->qid;
6488                 m->m_pkthdr.pf.ecn_af = AF_INET6;
6489                 m->m_pkthdr.pf.hdr = h;
6490                 if (s) {
6491                         /* for fairq */
6492                         m->m_pkthdr.pf.state_hash = s->hash;
6493                         m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
6494                 }
6495         }
6496 #endif /* ALTQ */
6497
6498         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6499             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6500             (s->nat_rule.ptr->action == PF_RDR ||
6501             s->nat_rule.ptr->action == PF_BINAT) &&
6502             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6503                 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
6504
6505         if (dir == PF_IN && action == PF_PASS && r->divert.port) {
6506                 struct pf_divert *divert;
6507
6508                 if ((divert = pf_get_divert(m))) {
6509                         m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
6510                         divert->port = r->divert.port;
6511                         divert->addr.ipv6 = r->divert.addr.v6;
6512                 }
6513         }
6514
6515         if (log) {
6516                 struct pf_rule *lr;
6517
6518                 if (s != NULL && s->nat_rule.ptr != NULL &&
6519                     s->nat_rule.ptr->log & PF_LOG_ALL)
6520                         lr = s->nat_rule.ptr;
6521                 else
6522                         lr = r;
6523                 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset,
6524                     &pd);
6525         }
6526
6527         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6528         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6529
6530         if (action == PF_PASS || r->action == PF_DROP) {
6531                 dirndx = (dir == PF_OUT);
6532                 r->packets[dirndx]++;
6533                 r->bytes[dirndx] += pd.tot_len;
6534                 if (a != NULL) {
6535                         a->packets[dirndx]++;
6536                         a->bytes[dirndx] += pd.tot_len;
6537                 }
6538                 if (s != NULL) {
6539                         if (s->nat_rule.ptr != NULL) {
6540                                 s->nat_rule.ptr->packets[dirndx]++;
6541                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6542                         }
6543                         if (s->src_node != NULL) {
6544                                 s->src_node->packets[dirndx]++;
6545                                 s->src_node->bytes[dirndx] += pd.tot_len;
6546                         }
6547                         if (s->nat_src_node != NULL) {
6548                                 s->nat_src_node->packets[dirndx]++;
6549                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6550                         }
6551                         dirndx = (dir == s->direction) ? 0 : 1;
6552                         s->packets[dirndx]++;
6553                         s->bytes[dirndx] += pd.tot_len;
6554                 }
6555                 tr = r;
6556                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6557                 if (nr != NULL && r == &pf_default_rule)
6558                         tr = nr;
6559                 if (tr->src.addr.type == PF_ADDR_TABLE)
6560                         pfr_update_stats(tr->src.addr.p.tbl,
6561                             (s == NULL) ? pd.src :
6562                             &s->key[(s->direction == PF_IN)]->addr[0],
6563                             pd.af, pd.tot_len, dir == PF_OUT,
6564                             r->action == PF_PASS, tr->src.neg);
6565                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6566                         pfr_update_stats(tr->dst.addr.p.tbl,
6567                             (s == NULL) ? pd.dst :
6568                             &s->key[(s->direction == PF_IN)]->addr[1],
6569                             pd.af, pd.tot_len, dir == PF_OUT,
6570                             r->action == PF_PASS, tr->dst.neg);
6571         }
6572
6573
6574         if (action == PF_SYNPROXY_DROP) {
6575                 m_freem(*m0);
6576                 *m0 = NULL;
6577                 action = PF_PASS;
6578         } else if (r->rt)
6579                 /* pf_route6 can free the mbuf causing *m0 to become NULL */
6580                 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
6581
6582         return (action);
6583 }
6584 #endif /* INET6 */
6585
6586 int
6587 pf_check_congestion(struct ifqueue *ifq)
6588 {
6589                 return (0);
6590 }