1 /* 2 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 3 * 4 * Copyright (c) 2001 Daniel Hartmeier 5 * Copyright (c) 2002 - 2008 Henning Brauer 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * - Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * - Redistributions in binary form must reproduce the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer in the documentation and/or other materials provided 17 * with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 27 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 29 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 * 32 * Effort sponsored in part by the Defense Advanced Research Projects 33 * Agency (DARPA) and Air Force Research Laboratory, Air Force 34 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 35 * 36 */ 37 38 #include "opt_inet.h" 39 #include "opt_inet6.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/filio.h> 46 #include <sys/socket.h> 47 #include <sys/socketvar.h> 48 #include <sys/kernel.h> 49 #include <sys/time.h> 50 #include <sys/sysctl.h> 51 #include <sys/endian.h> 52 #include <sys/proc.h> 53 #include <sys/kthread.h> 54 #include <sys/spinlock.h> 55 56 #include <machine/inttypes.h> 57 58 #include <sys/md5.h> 59 60 #include <net/if.h> 61 #include <net/if_types.h> 62 #include <net/bpf.h> 63 #include <net/netisr2.h> 64 #include <net/route.h> 65 66 #include <netinet/in.h> 67 #include <netinet/in_var.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_var.h> 71 #include <netinet/tcp.h> 72 #include <netinet/tcp_seq.h> 73 #include <netinet/udp.h> 74 #include <netinet/ip_icmp.h> 75 #include <netinet/in_pcb.h> 76 #include <netinet/tcp_timer.h> 77 #include <netinet/tcp_var.h> 78 #include <netinet/udp_var.h> 79 #include <netinet/icmp_var.h> 80 #include <netinet/if_ether.h> 81 82 #include <net/pf/pfvar.h> 83 #include <net/pf/if_pflog.h> 84 85 #include <net/pf/if_pfsync.h> 86 87 #ifdef INET6 88 #include <netinet/ip6.h> 89 #include <netinet/icmp6.h> 90 #include <netinet6/nd6.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet6/in6_pcb.h> 93 #endif /* INET6 */ 94 95 #include <sys/in_cksum.h> 96 #include <sys/ucred.h> 97 #include <machine/limits.h> 98 #include <sys/msgport2.h> 99 #include <sys/spinlock2.h> 100 #include <net/netmsg2.h> 101 #include <net/toeplitz2.h> 102 103 extern int ip_optcopy(struct ip *, struct ip *); 104 extern int debug_pfugidhack; 105 106 /* 107 * pf_token - shared lock for cpu-localized operations, 108 * exclusive lock otherwise. 109 * 110 * pf_gtoken- exclusive lock used for initialization. 111 * 112 * pf_spin - only used to atomically fetch and increment stateid 113 * on 32-bit systems. 114 */ 115 struct lwkt_token pf_token = LWKT_TOKEN_INITIALIZER(pf_token); 116 struct lwkt_token pf_gtoken = LWKT_TOKEN_INITIALIZER(pf_gtoken); 117 #if __SIZEOF_LONG__ != 8 118 struct spinlock pf_spin = SPINLOCK_INITIALIZER(pf_spin, "pf_spin"); 119 #endif 120 121 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x 122 123 #define FAIL(code) { error = (code); goto done; } 124 125 /* 126 * Global variables 127 */ 128 129 /* mask radix tree */ 130 struct radix_node_head *pf_maskhead; 131 132 /* state tables */ 133 struct pf_state_tree pf_statetbl[MAXCPU+1]; /* incls one global table */ 134 135 struct pf_altqqueue pf_altqs[2]; 136 struct pf_palist pf_pabuf; 137 struct pf_altqqueue *pf_altqs_active; 138 struct pf_altqqueue *pf_altqs_inactive; 139 struct pf_status pf_status; 140 141 u_int32_t ticket_altqs_active; 142 u_int32_t ticket_altqs_inactive; 143 int altqs_inactive_open; 144 u_int32_t ticket_pabuf; 145 146 MD5_CTX pf_tcp_secret_ctx; 147 u_char pf_tcp_secret[16]; 148 int pf_tcp_secret_init; 149 int pf_tcp_iss_off; 150 151 struct pf_anchor_stackframe { 152 struct pf_ruleset *rs; 153 struct pf_rule *r; 154 struct pf_anchor_node *parent; 155 struct pf_anchor *child; 156 } pf_anchor_stack[64]; 157 158 struct malloc_type *pf_src_tree_pl, *pf_rule_pl, *pf_pooladdr_pl; 159 struct malloc_type *pf_state_pl, *pf_state_key_pl, *pf_state_item_pl; 160 struct malloc_type *pf_altq_pl; 161 162 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 163 164 void pf_init_threshold(struct pf_threshold *, u_int32_t, 165 u_int32_t); 166 void pf_add_threshold(struct pf_threshold *); 167 int pf_check_threshold(struct pf_threshold *); 168 169 void pf_change_ap(struct pf_addr *, u_int16_t *, 170 u_int16_t *, u_int16_t *, struct pf_addr *, 171 u_int16_t, u_int8_t, sa_family_t); 172 int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 173 struct tcphdr *, struct pf_state_peer *); 174 #ifdef INET6 175 void pf_change_a6(struct pf_addr *, u_int16_t *, 176 struct pf_addr *, u_int8_t); 177 #endif /* INET6 */ 178 void pf_change_icmp(struct pf_addr *, u_int16_t *, 179 struct pf_addr *, struct pf_addr *, u_int16_t, 180 u_int16_t *, u_int16_t *, u_int16_t *, 181 u_int16_t *, u_int8_t, sa_family_t); 182 void pf_send_tcp(const struct pf_rule *, sa_family_t, 183 const struct pf_addr *, const struct pf_addr *, 184 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 185 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 186 u_int16_t, struct ether_header *, struct ifnet *); 187 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 188 sa_family_t, struct pf_rule *); 189 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 190 int, int, struct pfi_kif *, 191 struct pf_addr *, u_int16_t, struct pf_addr *, 192 u_int16_t, int); 193 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 194 int, int, struct pfi_kif *, struct pf_src_node **, 195 struct pf_state_key **, struct pf_state_key **, 196 struct pf_state_key **, struct pf_state_key **, 197 struct pf_addr *, struct pf_addr *, 198 u_int16_t, u_int16_t); 199 void pf_detach_state(struct pf_state *); 200 int pf_state_key_setup(struct pf_pdesc *, struct pf_rule *, 201 struct pf_state_key **, struct pf_state_key **, 202 struct pf_state_key **, struct pf_state_key **, 203 struct pf_addr *, struct pf_addr *, 204 u_int16_t, u_int16_t); 205 void pf_state_key_detach(struct pf_state *, int); 206 u_int32_t pf_tcp_iss(struct pf_pdesc *); 207 int pf_test_rule(struct pf_rule **, struct pf_state **, 208 int, struct pfi_kif *, struct mbuf *, int, 209 void *, struct pf_pdesc *, struct pf_rule **, 210 struct pf_ruleset **, struct ifqueue *, struct inpcb *); 211 static __inline int pf_create_state(struct pf_rule *, struct pf_rule *, 212 struct pf_rule *, struct pf_pdesc *, 213 struct pf_src_node *, struct pf_state_key *, 214 struct pf_state_key *, struct pf_state_key *, 215 struct pf_state_key *, struct mbuf *, int, 216 u_int16_t, u_int16_t, int *, struct pfi_kif *, 217 struct pf_state **, int, u_int16_t, u_int16_t, 218 int); 219 int pf_test_fragment(struct pf_rule **, int, 220 struct pfi_kif *, struct mbuf *, void *, 221 struct pf_pdesc *, struct pf_rule **, 222 struct pf_ruleset **); 223 int pf_tcp_track_full(struct pf_state_peer *, 224 struct pf_state_peer *, struct pf_state **, 225 struct pfi_kif *, struct mbuf *, int, 226 struct pf_pdesc *, u_short *, int *); 227 int pf_tcp_track_sloppy(struct pf_state_peer *, 228 struct pf_state_peer *, struct pf_state **, 229 struct pf_pdesc *, u_short *); 230 int pf_test_state_tcp(struct pf_state **, int, 231 struct pfi_kif *, struct mbuf *, int, 232 void *, struct pf_pdesc *, u_short *); 233 int pf_test_state_udp(struct pf_state **, int, 234 struct pfi_kif *, struct mbuf *, int, 235 void *, struct pf_pdesc *); 236 int pf_test_state_icmp(struct pf_state **, int, 237 struct pfi_kif *, struct mbuf *, int, 238 void *, struct pf_pdesc *, u_short *); 239 int pf_test_state_other(struct pf_state **, int, 240 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 241 void pf_step_into_anchor(int *, struct pf_ruleset **, int, 242 struct pf_rule **, struct pf_rule **, int *); 243 int pf_step_out_of_anchor(int *, struct pf_ruleset **, 244 int, struct pf_rule **, struct pf_rule **, 245 int *); 246 void pf_hash(struct pf_addr *, struct pf_addr *, 247 struct pf_poolhashkey *, sa_family_t); 248 int pf_map_addr(u_int8_t, struct pf_rule *, 249 struct pf_addr *, struct pf_addr *, 250 struct pf_addr *, struct pf_src_node **); 251 int pf_get_sport(struct pf_pdesc *, 252 sa_family_t, u_int8_t, struct pf_rule *, 253 struct pf_addr *, struct pf_addr *, 254 u_int16_t, u_int16_t, 255 struct pf_addr *, u_int16_t *, 256 u_int16_t, u_int16_t, 257 struct pf_src_node **); 258 void pf_route(struct mbuf **, struct pf_rule *, int, 259 struct ifnet *, struct pf_state *, 260 struct pf_pdesc *); 261 void pf_route6(struct mbuf **, struct pf_rule *, int, 262 struct ifnet *, struct pf_state *, 263 struct pf_pdesc *); 264 u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 265 sa_family_t); 266 u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 267 sa_family_t); 268 u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 269 u_int16_t); 270 void pf_set_rt_ifp(struct pf_state *, 271 struct pf_addr *); 272 int pf_check_proto_cksum(struct mbuf *, int, int, 273 u_int8_t, sa_family_t); 274 struct pf_divert *pf_get_divert(struct mbuf *); 275 void pf_print_state_parts(struct pf_state *, 276 struct pf_state_key *, struct pf_state_key *); 277 int pf_addr_wrap_neq(struct pf_addr_wrap *, 278 struct pf_addr_wrap *); 279 struct pf_state *pf_find_state(struct pfi_kif *, 280 struct pf_state_key_cmp *, u_int, struct mbuf *); 281 int pf_src_connlimit(struct pf_state *); 282 int pf_check_congestion(struct ifqueue *); 283 284 extern int pf_end_threads; 285 286 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 287 { &pf_state_pl, PFSTATE_HIWAT }, 288 { &pf_src_tree_pl, PFSNODE_HIWAT }, 289 { &pf_frent_pl, PFFRAG_FRENT_HIWAT }, 290 { &pfr_ktable_pl, PFR_KTABLE_HIWAT }, 291 { &pfr_kentry_pl, PFR_KENTRY_HIWAT } 292 }; 293 294 /* 295 * If route-to and direction is out we match with no further processing 296 * (rt_kif must be assigned and not equal to the out interface) 297 * If reply-to and direction is in we match with no further processing 298 * (rt_kif must be assigned and not equal to the in interface) 299 */ 300 #define STATE_LOOKUP(i, k, d, s, m) \ 301 do { \ 302 s = pf_find_state(i, k, d, m); \ 303 if (s == NULL || (s)->timeout == PFTM_PURGE) \ 304 return (PF_DROP); \ 305 if (d == PF_OUT && \ 306 (((s)->rule.ptr->rt == PF_ROUTETO && \ 307 (s)->rule.ptr->direction == PF_OUT) || \ 308 ((s)->rule.ptr->rt == PF_REPLYTO && \ 309 (s)->rule.ptr->direction == PF_IN)) && \ 310 (s)->rt_kif != NULL && \ 311 (s)->rt_kif != i) \ 312 return (PF_PASS); \ 313 } while (0) 314 315 #define BOUND_IFACE(r, k) \ 316 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all 317 318 #define STATE_INC_COUNTERS(s) \ 319 do { \ 320 atomic_add_int(&s->rule.ptr->states_cur, 1); \ 321 s->rule.ptr->states_tot++; \ 322 if (s->anchor.ptr != NULL) { \ 323 atomic_add_int(&s->anchor.ptr->states_cur, 1); \ 324 s->anchor.ptr->states_tot++; \ 325 } \ 326 if (s->nat_rule.ptr != NULL) { \ 327 atomic_add_int(&s->nat_rule.ptr->states_cur, 1); \ 328 s->nat_rule.ptr->states_tot++; \ 329 } \ 330 } while (0) 331 332 #define STATE_DEC_COUNTERS(s) \ 333 do { \ 334 if (s->nat_rule.ptr != NULL) \ 335 atomic_add_int(&s->nat_rule.ptr->states_cur, -1); \ 336 if (s->anchor.ptr != NULL) \ 337 atomic_add_int(&s->anchor.ptr->states_cur, -1); \ 338 atomic_add_int(&s->rule.ptr->states_cur, -1); \ 339 } while (0) 340 341 static MALLOC_DEFINE(M_PFSTATEPL, "pfstatepl", "pf state pool list"); 342 static MALLOC_DEFINE(M_PFSRCTREEPL, "pfsrctpl", "pf source tree pool list"); 343 static MALLOC_DEFINE(M_PFSTATEKEYPL, "pfstatekeypl", "pf state key pool list"); 344 static MALLOC_DEFINE(M_PFSTATEITEMPL, "pfstateitempl", "pf state item pool list"); 345 346 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 347 static __inline int pf_state_compare_key(struct pf_state_key *, 348 struct pf_state_key *); 349 static __inline int pf_state_compare_rkey(struct pf_state_key *, 350 struct pf_state_key *); 351 static __inline int pf_state_compare_id(struct pf_state *, 352 struct pf_state *); 353 354 struct pf_src_tree tree_src_tracking[MAXCPU]; 355 struct pf_state_tree_id tree_id[MAXCPU]; 356 struct pf_state_queue state_list[MAXCPU]; 357 358 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 359 RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key); 360 RB_GENERATE(pf_state_rtree, pf_state_key, entry, pf_state_compare_rkey); 361 RB_GENERATE(pf_state_tree_id, pf_state, entry_id, pf_state_compare_id); 362 363 static __inline int 364 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 365 { 366 int diff; 367 368 if (a->rule.ptr > b->rule.ptr) 369 return (1); 370 if (a->rule.ptr < b->rule.ptr) 371 return (-1); 372 if ((diff = a->af - b->af) != 0) 373 return (diff); 374 switch (a->af) { 375 #ifdef INET 376 case AF_INET: 377 if (a->addr.addr32[0] > b->addr.addr32[0]) 378 return (1); 379 if (a->addr.addr32[0] < b->addr.addr32[0]) 380 return (-1); 381 break; 382 #endif /* INET */ 383 #ifdef INET6 384 case AF_INET6: 385 if (a->addr.addr32[3] > b->addr.addr32[3]) 386 return (1); 387 if (a->addr.addr32[3] < b->addr.addr32[3]) 388 return (-1); 389 if (a->addr.addr32[2] > b->addr.addr32[2]) 390 return (1); 391 if (a->addr.addr32[2] < b->addr.addr32[2]) 392 return (-1); 393 if (a->addr.addr32[1] > b->addr.addr32[1]) 394 return (1); 395 if (a->addr.addr32[1] < b->addr.addr32[1]) 396 return (-1); 397 if (a->addr.addr32[0] > b->addr.addr32[0]) 398 return (1); 399 if (a->addr.addr32[0] < b->addr.addr32[0]) 400 return (-1); 401 break; 402 #endif /* INET6 */ 403 } 404 return (0); 405 } 406 407 u_int32_t 408 pf_state_hash(struct pf_state_key *sk) 409 { 410 u_int32_t hv = (u_int32_t)(((intptr_t)sk >> 6) ^ ((intptr_t)sk >> 15)); 411 if (hv == 0) /* disallow 0 */ 412 hv = 1; 413 return(hv); 414 } 415 416 #ifdef INET6 417 void 418 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 419 { 420 switch (af) { 421 #ifdef INET 422 case AF_INET: 423 dst->addr32[0] = src->addr32[0]; 424 break; 425 #endif /* INET */ 426 case AF_INET6: 427 dst->addr32[0] = src->addr32[0]; 428 dst->addr32[1] = src->addr32[1]; 429 dst->addr32[2] = src->addr32[2]; 430 dst->addr32[3] = src->addr32[3]; 431 break; 432 } 433 } 434 #endif /* INET6 */ 435 436 void 437 pf_init_threshold(struct pf_threshold *threshold, 438 u_int32_t limit, u_int32_t seconds) 439 { 440 threshold->limit = limit * PF_THRESHOLD_MULT; 441 threshold->seconds = seconds; 442 threshold->count = 0; 443 threshold->last = time_second; 444 } 445 446 void 447 pf_add_threshold(struct pf_threshold *threshold) 448 { 449 u_int32_t t = time_second, diff = t - threshold->last; 450 451 if (diff >= threshold->seconds) 452 threshold->count = 0; 453 else 454 threshold->count -= threshold->count * diff / 455 threshold->seconds; 456 threshold->count += PF_THRESHOLD_MULT; 457 threshold->last = t; 458 } 459 460 int 461 pf_check_threshold(struct pf_threshold *threshold) 462 { 463 return (threshold->count > threshold->limit); 464 } 465 466 int 467 pf_src_connlimit(struct pf_state *state) 468 { 469 int bad = 0; 470 int cpu = mycpu->gd_cpuid; 471 472 atomic_add_int(&state->src_node->conn, 1); 473 state->src.tcp_est = 1; 474 pf_add_threshold(&state->src_node->conn_rate); 475 476 if (state->rule.ptr->max_src_conn && 477 state->rule.ptr->max_src_conn < 478 state->src_node->conn) { 479 pf_status.lcounters[LCNT_SRCCONN]++; 480 bad++; 481 } 482 483 if (state->rule.ptr->max_src_conn_rate.limit && 484 pf_check_threshold(&state->src_node->conn_rate)) { 485 pf_status.lcounters[LCNT_SRCCONNRATE]++; 486 bad++; 487 } 488 489 if (!bad) 490 return 0; 491 492 if (state->rule.ptr->overload_tbl) { 493 struct pfr_addr p; 494 u_int32_t killed = 0; 495 496 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 497 if (pf_status.debug >= PF_DEBUG_MISC) { 498 kprintf("pf_src_connlimit: blocking address "); 499 pf_print_host(&state->src_node->addr, 0, 500 state->key[PF_SK_WIRE]->af); 501 } 502 503 bzero(&p, sizeof(p)); 504 p.pfra_af = state->key[PF_SK_WIRE]->af; 505 switch (state->key[PF_SK_WIRE]->af) { 506 #ifdef INET 507 case AF_INET: 508 p.pfra_net = 32; 509 p.pfra_ip4addr = state->src_node->addr.v4; 510 break; 511 #endif /* INET */ 512 #ifdef INET6 513 case AF_INET6: 514 p.pfra_net = 128; 515 p.pfra_ip6addr = state->src_node->addr.v6; 516 break; 517 #endif /* INET6 */ 518 } 519 520 pfr_insert_kentry(state->rule.ptr->overload_tbl, 521 &p, time_second); 522 523 /* kill existing states if that's required. */ 524 if (state->rule.ptr->flush) { 525 struct pf_state_key *sk; 526 struct pf_state *st; 527 528 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 529 RB_FOREACH(st, pf_state_tree_id, &tree_id[cpu]) { 530 sk = st->key[PF_SK_WIRE]; 531 /* 532 * Kill states from this source. (Only those 533 * from the same rule if PF_FLUSH_GLOBAL is not 534 * set). (Only on current cpu). 535 */ 536 if (sk->af == 537 state->key[PF_SK_WIRE]->af && 538 ((state->direction == PF_OUT && 539 PF_AEQ(&state->src_node->addr, 540 &sk->addr[0], sk->af)) || 541 (state->direction == PF_IN && 542 PF_AEQ(&state->src_node->addr, 543 &sk->addr[1], sk->af))) && 544 (state->rule.ptr->flush & 545 PF_FLUSH_GLOBAL || 546 state->rule.ptr == st->rule.ptr)) { 547 st->timeout = PFTM_PURGE; 548 st->src.state = st->dst.state = 549 TCPS_CLOSED; 550 killed++; 551 } 552 } 553 if (pf_status.debug >= PF_DEBUG_MISC) 554 kprintf(", %u states killed", killed); 555 } 556 if (pf_status.debug >= PF_DEBUG_MISC) 557 kprintf("\n"); 558 } 559 560 /* kill this state */ 561 state->timeout = PFTM_PURGE; 562 state->src.state = state->dst.state = TCPS_CLOSED; 563 564 return 1; 565 } 566 567 int 568 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 569 struct pf_addr *src, sa_family_t af) 570 { 571 struct pf_src_node k; 572 int cpu = mycpu->gd_cpuid; 573 574 bzero(&k, sizeof(k)); /* avoid gcc warnings */ 575 if (*sn == NULL) { 576 k.af = af; 577 PF_ACPY(&k.addr, src, af); 578 if (rule->rule_flag & PFRULE_RULESRCTRACK || 579 rule->rpool.opts & PF_POOL_STICKYADDR) 580 k.rule.ptr = rule; 581 else 582 k.rule.ptr = NULL; 583 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 584 *sn = RB_FIND(pf_src_tree, &tree_src_tracking[cpu], &k); 585 } 586 if (*sn == NULL) { 587 if (!rule->max_src_nodes || 588 rule->src_nodes < rule->max_src_nodes) 589 (*sn) = kmalloc(sizeof(struct pf_src_node), 590 M_PFSRCTREEPL, M_NOWAIT|M_ZERO); 591 else 592 pf_status.lcounters[LCNT_SRCNODES]++; 593 if ((*sn) == NULL) 594 return (-1); 595 596 pf_init_threshold(&(*sn)->conn_rate, 597 rule->max_src_conn_rate.limit, 598 rule->max_src_conn_rate.seconds); 599 600 (*sn)->af = af; 601 if (rule->rule_flag & PFRULE_RULESRCTRACK || 602 rule->rpool.opts & PF_POOL_STICKYADDR) 603 (*sn)->rule.ptr = rule; 604 else 605 (*sn)->rule.ptr = NULL; 606 PF_ACPY(&(*sn)->addr, src, af); 607 if (RB_INSERT(pf_src_tree, 608 &tree_src_tracking[cpu], *sn) != NULL) { 609 if (pf_status.debug >= PF_DEBUG_MISC) { 610 kprintf("pf: src_tree insert failed: "); 611 pf_print_host(&(*sn)->addr, 0, af); 612 kprintf("\n"); 613 } 614 kfree(*sn, M_PFSRCTREEPL); 615 return (-1); 616 } 617 618 /* 619 * Atomic op required to increment src_nodes in the rule 620 * because we hold a shared token here (decrements will use 621 * an exclusive token). 622 */ 623 (*sn)->creation = time_second; 624 (*sn)->ruletype = rule->action; 625 if ((*sn)->rule.ptr != NULL) 626 atomic_add_int(&(*sn)->rule.ptr->src_nodes, 1); 627 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 628 atomic_add_int(&pf_status.src_nodes, 1); 629 } else { 630 if (rule->max_src_states && 631 (*sn)->states >= rule->max_src_states) { 632 pf_status.lcounters[LCNT_SRCSTATES]++; 633 return (-1); 634 } 635 } 636 return (0); 637 } 638 639 /* 640 * state table (indexed by the pf_state_key structure), normal RBTREE 641 * comparison. 642 */ 643 static __inline int 644 pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b) 645 { 646 int diff; 647 648 if ((diff = a->proto - b->proto) != 0) 649 return (diff); 650 if ((diff = a->af - b->af) != 0) 651 return (diff); 652 switch (a->af) { 653 #ifdef INET 654 case AF_INET: 655 if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 656 return (1); 657 if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 658 return (-1); 659 if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 660 return (1); 661 if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 662 return (-1); 663 break; 664 #endif /* INET */ 665 #ifdef INET6 666 case AF_INET6: 667 if (a->addr[0].addr32[3] > b->addr[0].addr32[3]) 668 return (1); 669 if (a->addr[0].addr32[3] < b->addr[0].addr32[3]) 670 return (-1); 671 if (a->addr[1].addr32[3] > b->addr[1].addr32[3]) 672 return (1); 673 if (a->addr[1].addr32[3] < b->addr[1].addr32[3]) 674 return (-1); 675 if (a->addr[0].addr32[2] > b->addr[0].addr32[2]) 676 return (1); 677 if (a->addr[0].addr32[2] < b->addr[0].addr32[2]) 678 return (-1); 679 if (a->addr[1].addr32[2] > b->addr[1].addr32[2]) 680 return (1); 681 if (a->addr[1].addr32[2] < b->addr[1].addr32[2]) 682 return (-1); 683 if (a->addr[0].addr32[1] > b->addr[0].addr32[1]) 684 return (1); 685 if (a->addr[0].addr32[1] < b->addr[0].addr32[1]) 686 return (-1); 687 if (a->addr[1].addr32[1] > b->addr[1].addr32[1]) 688 return (1); 689 if (a->addr[1].addr32[1] < b->addr[1].addr32[1]) 690 return (-1); 691 if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 692 return (1); 693 if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 694 return (-1); 695 if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 696 return (1); 697 if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 698 return (-1); 699 break; 700 #endif /* INET6 */ 701 } 702 703 if ((diff = a->port[0] - b->port[0]) != 0) 704 return (diff); 705 if ((diff = a->port[1] - b->port[1]) != 0) 706 return (diff); 707 708 return (0); 709 } 710 711 /* 712 * Used for RB_FIND only, compare in the reverse direction. The 713 * element to be reversed is always (a), since we obviously can't 714 * reverse the state tree depicted by (b). 715 */ 716 static __inline int 717 pf_state_compare_rkey(struct pf_state_key *a, struct pf_state_key *b) 718 { 719 int diff; 720 721 if ((diff = a->proto - b->proto) != 0) 722 return (diff); 723 if ((diff = a->af - b->af) != 0) 724 return (diff); 725 switch (a->af) { 726 #ifdef INET 727 case AF_INET: 728 if (a->addr[1].addr32[0] > b->addr[0].addr32[0]) 729 return (1); 730 if (a->addr[1].addr32[0] < b->addr[0].addr32[0]) 731 return (-1); 732 if (a->addr[0].addr32[0] > b->addr[1].addr32[0]) 733 return (1); 734 if (a->addr[0].addr32[0] < b->addr[1].addr32[0]) 735 return (-1); 736 break; 737 #endif /* INET */ 738 #ifdef INET6 739 case AF_INET6: 740 if (a->addr[1].addr32[3] > b->addr[0].addr32[3]) 741 return (1); 742 if (a->addr[1].addr32[3] < b->addr[0].addr32[3]) 743 return (-1); 744 if (a->addr[0].addr32[3] > b->addr[1].addr32[3]) 745 return (1); 746 if (a->addr[0].addr32[3] < b->addr[1].addr32[3]) 747 return (-1); 748 if (a->addr[1].addr32[2] > b->addr[0].addr32[2]) 749 return (1); 750 if (a->addr[1].addr32[2] < b->addr[0].addr32[2]) 751 return (-1); 752 if (a->addr[0].addr32[2] > b->addr[1].addr32[2]) 753 return (1); 754 if (a->addr[0].addr32[2] < b->addr[1].addr32[2]) 755 return (-1); 756 if (a->addr[1].addr32[1] > b->addr[0].addr32[1]) 757 return (1); 758 if (a->addr[1].addr32[1] < b->addr[0].addr32[1]) 759 return (-1); 760 if (a->addr[0].addr32[1] > b->addr[1].addr32[1]) 761 return (1); 762 if (a->addr[0].addr32[1] < b->addr[1].addr32[1]) 763 return (-1); 764 if (a->addr[1].addr32[0] > b->addr[0].addr32[0]) 765 return (1); 766 if (a->addr[1].addr32[0] < b->addr[0].addr32[0]) 767 return (-1); 768 if (a->addr[0].addr32[0] > b->addr[1].addr32[0]) 769 return (1); 770 if (a->addr[0].addr32[0] < b->addr[1].addr32[0]) 771 return (-1); 772 break; 773 #endif /* INET6 */ 774 } 775 776 if ((diff = a->port[1] - b->port[0]) != 0) 777 return (diff); 778 if ((diff = a->port[0] - b->port[1]) != 0) 779 return (diff); 780 781 return (0); 782 } 783 784 static __inline int 785 pf_state_compare_id(struct pf_state *a, struct pf_state *b) 786 { 787 if (a->id > b->id) 788 return (1); 789 if (a->id < b->id) 790 return (-1); 791 if (a->creatorid > b->creatorid) 792 return (1); 793 if (a->creatorid < b->creatorid) 794 return (-1); 795 796 return (0); 797 } 798 799 int 800 pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx) 801 { 802 struct pf_state_item *si; 803 struct pf_state_key *cur; 804 int cpu; 805 int error; 806 807 /* 808 * PFSTATE_STACK_GLOBAL is set when the state might not hash to the 809 * current cpu. The keys are managed on the global statetbl tree 810 * for this case. Only translations (RDR, NAT) can cause this. 811 * 812 * When this flag is not set we must still check the global statetbl 813 * for a collision, and if we find one we set the HALF_DUPLEX flag 814 * in the state. 815 */ 816 if (s->state_flags & PFSTATE_STACK_GLOBAL) { 817 cpu = MAXCPU; 818 lockmgr(&pf_global_statetbl_lock, LK_EXCLUSIVE); 819 } else { 820 cpu = mycpu->gd_cpuid; 821 lockmgr(&pf_global_statetbl_lock, LK_SHARED); 822 } 823 KKASSERT(s->key[idx] == NULL); /* XXX handle this? */ 824 825 if (pf_status.debug >= PF_DEBUG_MISC) { 826 kprintf("state_key attach cpu %d (%08x:%d) %s (%08x:%d)\n", 827 cpu, 828 ntohl(sk->addr[0].addr32[0]), ntohs(sk->port[0]), 829 (idx == PF_SK_WIRE ? "->" : "<-"), 830 ntohl(sk->addr[1].addr32[0]), ntohs(sk->port[1])); 831 } 832 833 /* 834 * Check whether (e.g.) a PASS rule being put on a per-cpu tree 835 * collides with a translation rule on the global tree. This is 836 * NOT an error. We *WANT* to establish state for this case so the 837 * packet path is short-cutted and doesn't need to scan the ruleset 838 * on every packet. But the established state will only see one 839 * side of a two-way packet conversation. To prevent this from 840 * causing problems (e.g. generating a RST), we force PFSTATE_SLOPPY 841 * to be set on the established state. 842 * 843 * A collision against RDR state can only occur with a PASS IN in the 844 * opposite direction or a PASS OUT in the forwards direction. This 845 * is because RDRs are processed on the input side. 846 * 847 * A collision against NAT state can only occur with a PASS IN in the 848 * forwards direction or a PASS OUT in the opposite direction. This 849 * is because NATs are processed on the output side. 850 * 851 * In both situations we need to do a reverse addr/port test because 852 * the PASS IN or PASS OUT only establishes if it doesn't match the 853 * established RDR state in the forwards direction. The direction 854 * flag has to be ignored (it will be one way for a PASS IN and the 855 * other way for a PASS OUT). 856 * 857 * pf_global_statetbl_lock will be locked shared when testing and 858 * not entering into the global state table. 859 */ 860 if (cpu != MAXCPU && 861 (cur = RB_FIND(pf_state_rtree, 862 (struct pf_state_rtree *)&pf_statetbl[MAXCPU], 863 sk)) != NULL) { 864 TAILQ_FOREACH(si, &cur->states, entry) { 865 /* 866 * NOTE: We must ignore direction mismatches. 867 */ 868 if (si->s->kif == s->kif) { 869 s->state_flags |= PFSTATE_HALF_DUPLEX | 870 PFSTATE_SLOPPY; 871 if (pf_status.debug >= PF_DEBUG_MISC) { 872 kprintf( 873 "pf: %s key attach collision " 874 "on %s: ", 875 (idx == PF_SK_WIRE) ? 876 "wire" : "stack", 877 s->kif->pfik_name); 878 pf_print_state_parts(s, 879 (idx == PF_SK_WIRE) ? sk : NULL, 880 (idx == PF_SK_STACK) ? sk : NULL); 881 kprintf("\n"); 882 } 883 break; 884 } 885 } 886 } 887 888 /* 889 * Enter into either the per-cpu or the global state table. 890 * 891 * pf_global_statetbl_lock will be locked exclusively when entering 892 * into the global state table. 893 */ 894 if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl[cpu], sk)) != NULL) { 895 /* key exists. check for same kif, if none, add to key */ 896 TAILQ_FOREACH(si, &cur->states, entry) { 897 if (si->s->kif == s->kif && 898 si->s->direction == s->direction) { 899 if (pf_status.debug >= PF_DEBUG_MISC) { 900 kprintf( 901 "pf: %s key attach failed on %s: ", 902 (idx == PF_SK_WIRE) ? 903 "wire" : "stack", 904 s->kif->pfik_name); 905 pf_print_state_parts(s, 906 (idx == PF_SK_WIRE) ? sk : NULL, 907 (idx == PF_SK_STACK) ? sk : NULL); 908 kprintf("\n"); 909 } 910 kfree(sk, M_PFSTATEKEYPL); 911 error = -1; 912 goto failed; /* collision! */ 913 } 914 } 915 kfree(sk, M_PFSTATEKEYPL); 916 917 s->key[idx] = cur; 918 } else { 919 s->key[idx] = sk; 920 } 921 922 if ((si = kmalloc(sizeof(struct pf_state_item), 923 M_PFSTATEITEMPL, M_NOWAIT)) == NULL) { 924 pf_state_key_detach(s, idx); 925 error = -1; 926 goto failed; /* collision! */ 927 } 928 si->s = s; 929 930 /* list is sorted, if-bound states before floating */ 931 if (s->kif == pfi_all) 932 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry); 933 else 934 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry); 935 936 error = 0; 937 failed: 938 lockmgr(&pf_global_statetbl_lock, LK_RELEASE); 939 return error; 940 } 941 942 /* 943 * NOTE: Can only be called indirectly via the purge thread with pf_token 944 * exclusively locked. 945 */ 946 void 947 pf_detach_state(struct pf_state *s) 948 { 949 if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK]) 950 s->key[PF_SK_WIRE] = NULL; 951 952 if (s->key[PF_SK_STACK] != NULL) 953 pf_state_key_detach(s, PF_SK_STACK); 954 955 if (s->key[PF_SK_WIRE] != NULL) 956 pf_state_key_detach(s, PF_SK_WIRE); 957 } 958 959 /* 960 * NOTE: Can only be called indirectly via the purge thread with pf_token 961 * exclusively locked. 962 */ 963 void 964 pf_state_key_detach(struct pf_state *s, int idx) 965 { 966 struct pf_state_item *si; 967 int cpu; 968 969 /* 970 * PFSTATE_STACK_GLOBAL is set for translations when the translated 971 * address/port is not localized to the same cpu that the untranslated 972 * address/port is on. The wire pf_state_key is managed on the global 973 * statetbl tree for this case. 974 */ 975 if (s->state_flags & PFSTATE_STACK_GLOBAL) { 976 cpu = MAXCPU; 977 lockmgr(&pf_global_statetbl_lock, LK_EXCLUSIVE); 978 } else { 979 cpu = mycpu->gd_cpuid; 980 } 981 982 si = TAILQ_FIRST(&s->key[idx]->states); 983 while (si && si->s != s) 984 si = TAILQ_NEXT(si, entry); 985 986 if (si) { 987 TAILQ_REMOVE(&s->key[idx]->states, si, entry); 988 kfree(si, M_PFSTATEITEMPL); 989 } 990 991 if (TAILQ_EMPTY(&s->key[idx]->states)) { 992 RB_REMOVE(pf_state_tree, &pf_statetbl[cpu], s->key[idx]); 993 if (s->key[idx]->reverse) 994 s->key[idx]->reverse->reverse = NULL; 995 if (s->key[idx]->inp) 996 s->key[idx]->inp->inp_pf_sk = NULL; 997 kfree(s->key[idx], M_PFSTATEKEYPL); 998 } 999 s->key[idx] = NULL; 1000 1001 if (s->state_flags & PFSTATE_STACK_GLOBAL) 1002 lockmgr(&pf_global_statetbl_lock, LK_RELEASE); 1003 } 1004 1005 struct pf_state_key * 1006 pf_alloc_state_key(int pool_flags) 1007 { 1008 struct pf_state_key *sk; 1009 1010 sk = kmalloc(sizeof(struct pf_state_key), M_PFSTATEKEYPL, pool_flags); 1011 if (sk) { 1012 TAILQ_INIT(&sk->states); 1013 } 1014 return (sk); 1015 } 1016 1017 int 1018 pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr, 1019 struct pf_state_key **skw, struct pf_state_key **sks, 1020 struct pf_state_key **skp, struct pf_state_key **nkp, 1021 struct pf_addr *saddr, struct pf_addr *daddr, 1022 u_int16_t sport, u_int16_t dport) 1023 { 1024 KKASSERT((*skp == NULL && *nkp == NULL)); 1025 1026 if ((*skp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL) 1027 return (ENOMEM); 1028 1029 PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af); 1030 PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af); 1031 (*skp)->port[pd->sidx] = sport; 1032 (*skp)->port[pd->didx] = dport; 1033 (*skp)->proto = pd->proto; 1034 (*skp)->af = pd->af; 1035 1036 if (nr != NULL) { 1037 if ((*nkp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL) 1038 return (ENOMEM); /* caller must handle cleanup */ 1039 1040 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */ 1041 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af); 1042 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af); 1043 (*nkp)->port[0] = (*skp)->port[0]; 1044 (*nkp)->port[1] = (*skp)->port[1]; 1045 (*nkp)->proto = pd->proto; 1046 (*nkp)->af = pd->af; 1047 } else { 1048 *nkp = *skp; 1049 } 1050 1051 if (pd->dir == PF_IN) { 1052 *skw = *skp; 1053 *sks = *nkp; 1054 } else { 1055 *sks = *skp; 1056 *skw = *nkp; 1057 } 1058 return (0); 1059 } 1060 1061 /* 1062 * Insert pf_state with one or two state keys (allowing a reverse path lookup 1063 * which is used by NAT). In the NAT case skw is the initiator (?) and 1064 * sks is the target. 1065 */ 1066 int 1067 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1068 struct pf_state_key *sks, struct pf_state *s) 1069 { 1070 int cpu = mycpu->gd_cpuid; 1071 1072 s->kif = kif; 1073 s->cpuid = cpu; 1074 1075 if (skw == sks) { 1076 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) 1077 return (-1); 1078 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1079 } else { 1080 /* 1081 skw->reverse = sks; 1082 sks->reverse = skw; 1083 */ 1084 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) { 1085 kfree(sks, M_PFSTATEKEYPL); 1086 return (-1); 1087 } 1088 if (pf_state_key_attach(sks, s, PF_SK_STACK)) { 1089 pf_state_key_detach(s, PF_SK_WIRE); 1090 return (-1); 1091 } 1092 } 1093 1094 if (s->id == 0 && s->creatorid == 0) { 1095 u_int64_t sid; 1096 1097 #if __SIZEOF_LONG__ == 8 1098 sid = atomic_fetchadd_long(&pf_status.stateid, 1); 1099 #else 1100 spin_lock(&pf_spin); 1101 sid = pf_status.stateid++; 1102 spin_unlock(&pf_spin); 1103 #endif 1104 s->id = htobe64(sid); 1105 s->creatorid = pf_status.hostid; 1106 } 1107 1108 /* 1109 * Calculate hash code for altq 1110 */ 1111 s->hash = crc32(s->key[PF_SK_WIRE], PF_STATE_KEY_HASH_LENGTH); 1112 1113 if (RB_INSERT(pf_state_tree_id, &tree_id[cpu], s) != NULL) { 1114 if (pf_status.debug >= PF_DEBUG_MISC) { 1115 kprintf("pf: state insert failed: " 1116 "id: %016jx creatorid: %08x", 1117 (uintmax_t)be64toh(s->id), ntohl(s->creatorid)); 1118 if (s->sync_flags & PFSTATE_FROMSYNC) 1119 kprintf(" (from sync)"); 1120 kprintf("\n"); 1121 } 1122 pf_detach_state(s); 1123 return (-1); 1124 } 1125 TAILQ_INSERT_TAIL(&state_list[cpu], s, entry_list); 1126 pf_status.fcounters[FCNT_STATE_INSERT]++; 1127 atomic_add_int(&pf_status.states, 1); 1128 pfi_kif_ref(kif, PFI_KIF_REF_STATE); 1129 pfsync_insert_state(s); 1130 return (0); 1131 } 1132 1133 struct pf_state * 1134 pf_find_state_byid(struct pf_state_cmp *key) 1135 { 1136 int cpu = mycpu->gd_cpuid; 1137 1138 pf_status.fcounters[FCNT_STATE_SEARCH]++; 1139 1140 return (RB_FIND(pf_state_tree_id, &tree_id[cpu], 1141 (struct pf_state *)key)); 1142 } 1143 1144 /* 1145 * WARNING! May return a state structure that was localized to another cpu, 1146 * destruction is typically protected by the callers pf_token. 1147 * The element can only be destroyed 1148 */ 1149 struct pf_state * 1150 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir, 1151 struct mbuf *m) 1152 { 1153 struct pf_state_key *skey = (void *)key; 1154 struct pf_state_key *sk; 1155 struct pf_state_item *si; 1156 struct pf_state *s; 1157 int cpu = mycpu->gd_cpuid; 1158 int globalstl = 0; 1159 1160 pf_status.fcounters[FCNT_STATE_SEARCH]++; 1161 1162 if (dir == PF_OUT && m->m_pkthdr.pf.statekey && 1163 ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse) { 1164 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse; 1165 } else { 1166 sk = RB_FIND(pf_state_tree, &pf_statetbl[cpu], skey); 1167 if (sk == NULL) { 1168 lockmgr(&pf_global_statetbl_lock, LK_SHARED); 1169 sk = RB_FIND(pf_state_tree, &pf_statetbl[MAXCPU], skey); 1170 if (sk == NULL) { 1171 lockmgr(&pf_global_statetbl_lock, LK_RELEASE); 1172 return (NULL); 1173 } 1174 globalstl = 1; 1175 } 1176 if (dir == PF_OUT && m->m_pkthdr.pf.statekey) { 1177 ((struct pf_state_key *) 1178 m->m_pkthdr.pf.statekey)->reverse = sk; 1179 sk->reverse = m->m_pkthdr.pf.statekey; 1180 } 1181 } 1182 if (dir == PF_OUT) 1183 m->m_pkthdr.pf.statekey = NULL; 1184 1185 /* list is sorted, if-bound states before floating ones */ 1186 TAILQ_FOREACH(si, &sk->states, entry) { 1187 if ((si->s->kif == pfi_all || si->s->kif == kif) && 1188 sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] : 1189 si->s->key[PF_SK_STACK])) { 1190 break; 1191 } 1192 } 1193 1194 /* 1195 * Extract state before potentially releasing the global statetbl 1196 * lock. Ignore the state if the create is still in-progress as 1197 * it can be deleted out from under us by the owning localized cpu. 1198 * However, if CREATEINPROG is not set, state can only be deleted 1199 * by the purge thread which we are protected from via our shared 1200 * pf_token. 1201 */ 1202 if (si) { 1203 s = si->s; 1204 if (s && (s->state_flags & PFSTATE_CREATEINPROG)) 1205 s = NULL; 1206 } else { 1207 s = NULL; 1208 } 1209 if (globalstl) 1210 lockmgr(&pf_global_statetbl_lock, LK_RELEASE); 1211 return s; 1212 } 1213 1214 /* 1215 * WARNING! May return a state structure that was localized to another cpu, 1216 * destruction is typically protected by the callers pf_token. 1217 */ 1218 struct pf_state * 1219 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1220 { 1221 struct pf_state_key *skey = (void *)key; 1222 struct pf_state_key *sk; 1223 struct pf_state_item *si, *ret = NULL; 1224 struct pf_state *s; 1225 int cpu = mycpu->gd_cpuid; 1226 int globalstl = 0; 1227 1228 pf_status.fcounters[FCNT_STATE_SEARCH]++; 1229 1230 sk = RB_FIND(pf_state_tree, &pf_statetbl[cpu], skey); 1231 if (sk == NULL) { 1232 lockmgr(&pf_global_statetbl_lock, LK_SHARED); 1233 sk = RB_FIND(pf_state_tree, &pf_statetbl[MAXCPU], skey); 1234 globalstl = 1; 1235 } 1236 if (sk != NULL) { 1237 TAILQ_FOREACH(si, &sk->states, entry) 1238 if (dir == PF_INOUT || 1239 (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] : 1240 si->s->key[PF_SK_STACK]))) { 1241 if (more == NULL) { 1242 ret = si; 1243 break; 1244 } 1245 if (ret) 1246 (*more)++; 1247 else 1248 ret = si; 1249 } 1250 } 1251 1252 /* 1253 * Extract state before potentially releasing the global statetbl 1254 * lock. Ignore the state if the create is still in-progress as 1255 * it can be deleted out from under us by the owning localized cpu. 1256 * However, if CREATEINPROG is not set, state can only be deleted 1257 * by the purge thread which we are protected from via our shared 1258 * pf_token. 1259 */ 1260 if (ret) { 1261 s = ret->s; 1262 if (s && (s->state_flags & PFSTATE_CREATEINPROG)) 1263 s = NULL; 1264 } else { 1265 s = NULL; 1266 } 1267 if (globalstl) 1268 lockmgr(&pf_global_statetbl_lock, LK_RELEASE); 1269 return s; 1270 } 1271 1272 /* END state table stuff */ 1273 1274 void 1275 pf_purge_thread(void *v) 1276 { 1277 globaldata_t save_gd = mycpu; 1278 int nloops = 0; 1279 int locked = 0; 1280 int nn; 1281 int endingit; 1282 1283 for (;;) { 1284 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 1285 1286 endingit = pf_end_threads; 1287 1288 for (nn = 0; nn < ncpus; ++nn) { 1289 lwkt_setcpu_self(globaldata_find(nn)); 1290 1291 lwkt_gettoken(&pf_token); 1292 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1293 crit_enter(); 1294 1295 /* 1296 * process a fraction of the state table every second 1297 */ 1298 if(!pf_purge_expired_states( 1299 1 + (pf_status.states / 1300 pf_default_rule.timeout[ 1301 PFTM_INTERVAL]), 0)) { 1302 pf_purge_expired_states( 1303 1 + (pf_status.states / 1304 pf_default_rule.timeout[ 1305 PFTM_INTERVAL]), 1); 1306 } 1307 1308 /* 1309 * purge other expired types every PFTM_INTERVAL 1310 * seconds 1311 */ 1312 if (++nloops >= 1313 pf_default_rule.timeout[PFTM_INTERVAL]) { 1314 pf_purge_expired_fragments(); 1315 if (!pf_purge_expired_src_nodes(locked)) { 1316 pf_purge_expired_src_nodes(1); 1317 } 1318 nloops = 0; 1319 } 1320 1321 /* 1322 * If terminating the thread, clean everything out 1323 * (on all cpus). 1324 */ 1325 if (endingit) { 1326 pf_purge_expired_states(pf_status.states, 0); 1327 pf_purge_expired_fragments(); 1328 pf_purge_expired_src_nodes(1); 1329 } 1330 1331 crit_exit(); 1332 lockmgr(&pf_consistency_lock, LK_RELEASE); 1333 lwkt_reltoken(&pf_token); 1334 } 1335 lwkt_setcpu_self(save_gd); 1336 if (endingit) 1337 break; 1338 } 1339 1340 /* 1341 * Thread termination 1342 */ 1343 pf_end_threads++; 1344 wakeup(pf_purge_thread); 1345 kthread_exit(); 1346 } 1347 1348 u_int32_t 1349 pf_state_expires(const struct pf_state *state) 1350 { 1351 u_int32_t timeout; 1352 u_int32_t start; 1353 u_int32_t end; 1354 u_int32_t states; 1355 1356 /* handle all PFTM_* > PFTM_MAX here */ 1357 if (state->timeout == PFTM_PURGE) 1358 return (time_second); 1359 if (state->timeout == PFTM_UNTIL_PACKET) 1360 return (0); 1361 KKASSERT(state->timeout != PFTM_UNLINKED); 1362 KKASSERT(state->timeout < PFTM_MAX); 1363 timeout = state->rule.ptr->timeout[state->timeout]; 1364 if (!timeout) 1365 timeout = pf_default_rule.timeout[state->timeout]; 1366 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1367 if (start) { 1368 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1369 states = state->rule.ptr->states_cur; 1370 } else { 1371 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1372 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1373 states = pf_status.states; 1374 } 1375 if (end && states > start && start < end) { 1376 if (states < end) 1377 return (state->expire + timeout * (end - states) / 1378 (end - start)); 1379 else 1380 return (time_second); 1381 } 1382 return (state->expire + timeout); 1383 } 1384 1385 /* 1386 * (called with exclusive pf_token) 1387 */ 1388 int 1389 pf_purge_expired_src_nodes(int waslocked) 1390 { 1391 struct pf_src_node *cur, *next; 1392 int locked = waslocked; 1393 int cpu = mycpu->gd_cpuid; 1394 1395 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking[cpu]); 1396 cur; 1397 cur = next) { 1398 next = RB_NEXT(pf_src_tree, &tree_src_tracking[cpu], cur); 1399 1400 if (cur->states <= 0 && cur->expire <= time_second) { 1401 if (!locked) { 1402 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1403 next = RB_NEXT(pf_src_tree, 1404 &tree_src_tracking[cpu], cur); 1405 locked = 1; 1406 } 1407 if (cur->rule.ptr != NULL) { 1408 /* 1409 * decrements in rule should be ok, token is 1410 * held exclusively in this code path. 1411 */ 1412 atomic_add_int(&cur->rule.ptr->src_nodes, -1); 1413 if (cur->rule.ptr->states_cur <= 0 && 1414 cur->rule.ptr->max_src_nodes <= 0) 1415 pf_rm_rule(NULL, cur->rule.ptr); 1416 } 1417 RB_REMOVE(pf_src_tree, &tree_src_tracking[cpu], cur); 1418 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1419 atomic_add_int(&pf_status.src_nodes, -1); 1420 kfree(cur, M_PFSRCTREEPL); 1421 } 1422 } 1423 if (locked && !waslocked) 1424 lockmgr(&pf_consistency_lock, LK_RELEASE); 1425 return(1); 1426 } 1427 1428 void 1429 pf_src_tree_remove_state(struct pf_state *s) 1430 { 1431 u_int32_t timeout; 1432 1433 if (s->src_node != NULL) { 1434 if (s->src.tcp_est) 1435 atomic_add_int(&s->src_node->conn, -1); 1436 if (--s->src_node->states <= 0) { 1437 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1438 if (!timeout) { 1439 timeout = 1440 pf_default_rule.timeout[PFTM_SRC_NODE]; 1441 } 1442 s->src_node->expire = time_second + timeout; 1443 } 1444 } 1445 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1446 if (--s->nat_src_node->states <= 0) { 1447 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1448 if (!timeout) 1449 timeout = 1450 pf_default_rule.timeout[PFTM_SRC_NODE]; 1451 s->nat_src_node->expire = time_second + timeout; 1452 } 1453 } 1454 s->src_node = s->nat_src_node = NULL; 1455 } 1456 1457 /* callers should be at crit_enter() */ 1458 void 1459 pf_unlink_state(struct pf_state *cur) 1460 { 1461 int cpu = mycpu->gd_cpuid; 1462 1463 if (cur->src.state == PF_TCPS_PROXY_DST) { 1464 /* XXX wire key the right one? */ 1465 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af, 1466 &cur->key[PF_SK_WIRE]->addr[1], 1467 &cur->key[PF_SK_WIRE]->addr[0], 1468 cur->key[PF_SK_WIRE]->port[1], 1469 cur->key[PF_SK_WIRE]->port[0], 1470 cur->src.seqhi, cur->src.seqlo + 1, 1471 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1472 } 1473 RB_REMOVE(pf_state_tree_id, &tree_id[cpu], cur); 1474 if (cur->creatorid == pf_status.hostid) 1475 pfsync_delete_state(cur); 1476 cur->timeout = PFTM_UNLINKED; 1477 pf_src_tree_remove_state(cur); 1478 pf_detach_state(cur); 1479 } 1480 1481 static struct pf_state *purge_cur[MAXCPU]; 1482 1483 /* 1484 * callers should be at crit_enter() and hold pf_consistency_lock exclusively. 1485 * pf_token must also be held exclusively. 1486 */ 1487 void 1488 pf_free_state(struct pf_state *cur) 1489 { 1490 int cpu = mycpu->gd_cpuid; 1491 1492 KKASSERT(cur->cpuid == cpu); 1493 1494 if (pfsyncif != NULL && 1495 (pfsyncif->sc_bulk_send_next == cur || 1496 pfsyncif->sc_bulk_terminator == cur)) 1497 return; 1498 KKASSERT(cur->timeout == PFTM_UNLINKED); 1499 /* 1500 * decrements in rule should be ok, token is 1501 * held exclusively in this code path. 1502 */ 1503 if (--cur->rule.ptr->states_cur <= 0 && 1504 cur->rule.ptr->src_nodes <= 0) 1505 pf_rm_rule(NULL, cur->rule.ptr); 1506 if (cur->nat_rule.ptr != NULL) { 1507 if (--cur->nat_rule.ptr->states_cur <= 0 && 1508 cur->nat_rule.ptr->src_nodes <= 0) { 1509 pf_rm_rule(NULL, cur->nat_rule.ptr); 1510 } 1511 } 1512 if (cur->anchor.ptr != NULL) { 1513 if (--cur->anchor.ptr->states_cur <= 0) 1514 pf_rm_rule(NULL, cur->anchor.ptr); 1515 } 1516 pf_normalize_tcp_cleanup(cur); 1517 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE); 1518 1519 /* 1520 * We may be freeing pf_purge_expired_states()'s saved scan entry, 1521 * adjust it if necessary. 1522 */ 1523 if (purge_cur[cpu] == cur) { 1524 kprintf("PURGE CONFLICT\n"); 1525 purge_cur[cpu] = TAILQ_NEXT(purge_cur[cpu], entry_list); 1526 } 1527 TAILQ_REMOVE(&state_list[cpu], cur, entry_list); 1528 if (cur->tag) 1529 pf_tag_unref(cur->tag); 1530 kfree(cur, M_PFSTATEPL); 1531 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1532 atomic_add_int(&pf_status.states, -1); 1533 } 1534 1535 int 1536 pf_purge_expired_states(u_int32_t maxcheck, int waslocked) 1537 { 1538 struct pf_state *cur; 1539 int locked = waslocked; 1540 int cpu = mycpu->gd_cpuid; 1541 1542 while (maxcheck--) { 1543 /* 1544 * Wrap to start of list when we hit the end 1545 */ 1546 cur = purge_cur[cpu]; 1547 if (cur == NULL) { 1548 cur = TAILQ_FIRST(&state_list[cpu]); 1549 if (cur == NULL) 1550 break; /* list empty */ 1551 } 1552 1553 /* 1554 * Setup next (purge_cur) while we process this one. If 1555 * we block and something else deletes purge_cur, 1556 * pf_free_state() will adjust it further ahead. 1557 */ 1558 purge_cur[cpu] = TAILQ_NEXT(cur, entry_list); 1559 1560 if (cur->timeout == PFTM_UNLINKED) { 1561 /* free unlinked state */ 1562 if (! locked) { 1563 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1564 locked = 1; 1565 } 1566 pf_free_state(cur); 1567 } else if (pf_state_expires(cur) <= time_second) { 1568 /* unlink and free expired state */ 1569 pf_unlink_state(cur); 1570 if (! locked) { 1571 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE)) 1572 return (0); 1573 locked = 1; 1574 } 1575 pf_free_state(cur); 1576 } 1577 } 1578 1579 if (locked) 1580 lockmgr(&pf_consistency_lock, LK_RELEASE); 1581 return (1); 1582 } 1583 1584 int 1585 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1586 { 1587 if (aw->type != PF_ADDR_TABLE) 1588 return (0); 1589 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1590 return (1); 1591 return (0); 1592 } 1593 1594 void 1595 pf_tbladdr_remove(struct pf_addr_wrap *aw) 1596 { 1597 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1598 return; 1599 pfr_detach_table(aw->p.tbl); 1600 aw->p.tbl = NULL; 1601 } 1602 1603 void 1604 pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1605 { 1606 struct pfr_ktable *kt = aw->p.tbl; 1607 1608 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1609 return; 1610 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1611 kt = kt->pfrkt_root; 1612 aw->p.tbl = NULL; 1613 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1614 kt->pfrkt_cnt : -1; 1615 } 1616 1617 void 1618 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1619 { 1620 switch (af) { 1621 #ifdef INET 1622 case AF_INET: { 1623 u_int32_t a = ntohl(addr->addr32[0]); 1624 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1625 (a>>8)&255, a&255); 1626 if (p) { 1627 p = ntohs(p); 1628 kprintf(":%u", p); 1629 } 1630 break; 1631 } 1632 #endif /* INET */ 1633 #ifdef INET6 1634 case AF_INET6: { 1635 u_int16_t b; 1636 u_int8_t i, curstart, curend, maxstart, maxend; 1637 curstart = curend = maxstart = maxend = 255; 1638 for (i = 0; i < 8; i++) { 1639 if (!addr->addr16[i]) { 1640 if (curstart == 255) 1641 curstart = i; 1642 curend = i; 1643 } else { 1644 if ((curend - curstart) > 1645 (maxend - maxstart)) { 1646 maxstart = curstart; 1647 maxend = curend; 1648 } 1649 curstart = curend = 255; 1650 } 1651 } 1652 if ((curend - curstart) > 1653 (maxend - maxstart)) { 1654 maxstart = curstart; 1655 maxend = curend; 1656 } 1657 for (i = 0; i < 8; i++) { 1658 if (i >= maxstart && i <= maxend) { 1659 if (i == 0) 1660 kprintf(":"); 1661 if (i == maxend) 1662 kprintf(":"); 1663 } else { 1664 b = ntohs(addr->addr16[i]); 1665 kprintf("%x", b); 1666 if (i < 7) 1667 kprintf(":"); 1668 } 1669 } 1670 if (p) { 1671 p = ntohs(p); 1672 kprintf("[%u]", p); 1673 } 1674 break; 1675 } 1676 #endif /* INET6 */ 1677 } 1678 } 1679 1680 void 1681 pf_print_state(struct pf_state *s) 1682 { 1683 pf_print_state_parts(s, NULL, NULL); 1684 } 1685 1686 void 1687 pf_print_state_parts(struct pf_state *s, 1688 struct pf_state_key *skwp, struct pf_state_key *sksp) 1689 { 1690 struct pf_state_key *skw, *sks; 1691 u_int8_t proto, dir; 1692 1693 /* Do our best to fill these, but they're skipped if NULL */ 1694 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1695 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1696 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1697 dir = s ? s->direction : 0; 1698 1699 switch (proto) { 1700 case IPPROTO_TCP: 1701 kprintf("TCP "); 1702 break; 1703 case IPPROTO_UDP: 1704 kprintf("UDP "); 1705 break; 1706 case IPPROTO_ICMP: 1707 kprintf("ICMP "); 1708 break; 1709 case IPPROTO_ICMPV6: 1710 kprintf("ICMPV6 "); 1711 break; 1712 default: 1713 kprintf("%u ", skw->proto); 1714 break; 1715 } 1716 switch (dir) { 1717 case PF_IN: 1718 kprintf(" in"); 1719 break; 1720 case PF_OUT: 1721 kprintf(" out"); 1722 break; 1723 } 1724 if (skw) { 1725 kprintf(" wire: "); 1726 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1727 kprintf(" "); 1728 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1729 } 1730 if (sks) { 1731 kprintf(" stack: "); 1732 if (sks != skw) { 1733 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1734 kprintf(" "); 1735 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1736 } else 1737 kprintf("-"); 1738 } 1739 if (s) { 1740 if (proto == IPPROTO_TCP) { 1741 kprintf(" [lo=%u high=%u win=%u modulator=%u", 1742 s->src.seqlo, s->src.seqhi, 1743 s->src.max_win, s->src.seqdiff); 1744 if (s->src.wscale && s->dst.wscale) 1745 kprintf(" wscale=%u", 1746 s->src.wscale & PF_WSCALE_MASK); 1747 kprintf("]"); 1748 kprintf(" [lo=%u high=%u win=%u modulator=%u", 1749 s->dst.seqlo, s->dst.seqhi, 1750 s->dst.max_win, s->dst.seqdiff); 1751 if (s->src.wscale && s->dst.wscale) 1752 kprintf(" wscale=%u", 1753 s->dst.wscale & PF_WSCALE_MASK); 1754 kprintf("]"); 1755 } 1756 kprintf(" %u:%u", s->src.state, s->dst.state); 1757 } 1758 } 1759 1760 void 1761 pf_print_flags(u_int8_t f) 1762 { 1763 if (f) 1764 kprintf(" "); 1765 if (f & TH_FIN) 1766 kprintf("F"); 1767 if (f & TH_SYN) 1768 kprintf("S"); 1769 if (f & TH_RST) 1770 kprintf("R"); 1771 if (f & TH_PUSH) 1772 kprintf("P"); 1773 if (f & TH_ACK) 1774 kprintf("A"); 1775 if (f & TH_URG) 1776 kprintf("U"); 1777 if (f & TH_ECE) 1778 kprintf("E"); 1779 if (f & TH_CWR) 1780 kprintf("W"); 1781 } 1782 1783 #define PF_SET_SKIP_STEPS(i) \ 1784 do { \ 1785 while (head[i] != cur) { \ 1786 head[i]->skip[i].ptr = cur; \ 1787 head[i] = TAILQ_NEXT(head[i], entries); \ 1788 } \ 1789 } while (0) 1790 1791 void 1792 pf_calc_skip_steps(struct pf_rulequeue *rules) 1793 { 1794 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1795 int i; 1796 1797 cur = TAILQ_FIRST(rules); 1798 prev = cur; 1799 for (i = 0; i < PF_SKIP_COUNT; ++i) 1800 head[i] = cur; 1801 while (cur != NULL) { 1802 1803 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1804 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1805 if (cur->direction != prev->direction) 1806 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1807 if (cur->af != prev->af) 1808 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1809 if (cur->proto != prev->proto) 1810 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1811 if (cur->src.neg != prev->src.neg || 1812 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1813 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1814 if (cur->src.port[0] != prev->src.port[0] || 1815 cur->src.port[1] != prev->src.port[1] || 1816 cur->src.port_op != prev->src.port_op) 1817 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1818 if (cur->dst.neg != prev->dst.neg || 1819 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1820 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1821 if (cur->dst.port[0] != prev->dst.port[0] || 1822 cur->dst.port[1] != prev->dst.port[1] || 1823 cur->dst.port_op != prev->dst.port_op) 1824 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1825 1826 prev = cur; 1827 cur = TAILQ_NEXT(cur, entries); 1828 } 1829 for (i = 0; i < PF_SKIP_COUNT; ++i) 1830 PF_SET_SKIP_STEPS(i); 1831 } 1832 1833 int 1834 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1835 { 1836 if (aw1->type != aw2->type) 1837 return (1); 1838 switch (aw1->type) { 1839 case PF_ADDR_ADDRMASK: 1840 case PF_ADDR_RANGE: 1841 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1842 return (1); 1843 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1844 return (1); 1845 return (0); 1846 case PF_ADDR_DYNIFTL: 1847 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1848 case PF_ADDR_NOROUTE: 1849 case PF_ADDR_URPFFAILED: 1850 return (0); 1851 case PF_ADDR_TABLE: 1852 return (aw1->p.tbl != aw2->p.tbl); 1853 case PF_ADDR_RTLABEL: 1854 return (aw1->v.rtlabel != aw2->v.rtlabel); 1855 default: 1856 kprintf("invalid address type: %d\n", aw1->type); 1857 return (1); 1858 } 1859 } 1860 1861 u_int16_t 1862 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1863 { 1864 u_int32_t l; 1865 1866 if (udp && !cksum) 1867 return (0x0000); 1868 l = cksum + old - new; 1869 l = (l >> 16) + (l & 65535); 1870 l = l & 65535; 1871 if (udp && !l) 1872 return (0xFFFF); 1873 return (l); 1874 } 1875 1876 void 1877 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1878 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1879 { 1880 struct pf_addr ao; 1881 u_int16_t po = *p; 1882 1883 PF_ACPY(&ao, a, af); 1884 PF_ACPY(a, an, af); 1885 1886 *p = pn; 1887 1888 switch (af) { 1889 #ifdef INET 1890 case AF_INET: 1891 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1892 ao.addr16[0], an->addr16[0], 0), 1893 ao.addr16[1], an->addr16[1], 0); 1894 *p = pn; 1895 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1896 ao.addr16[0], an->addr16[0], u), 1897 ao.addr16[1], an->addr16[1], u), 1898 po, pn, u); 1899 break; 1900 #endif /* INET */ 1901 #ifdef INET6 1902 case AF_INET6: 1903 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1904 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1905 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1906 ao.addr16[0], an->addr16[0], u), 1907 ao.addr16[1], an->addr16[1], u), 1908 ao.addr16[2], an->addr16[2], u), 1909 ao.addr16[3], an->addr16[3], u), 1910 ao.addr16[4], an->addr16[4], u), 1911 ao.addr16[5], an->addr16[5], u), 1912 ao.addr16[6], an->addr16[6], u), 1913 ao.addr16[7], an->addr16[7], u), 1914 po, pn, u); 1915 break; 1916 #endif /* INET6 */ 1917 } 1918 } 1919 1920 1921 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1922 void 1923 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1924 { 1925 u_int32_t ao; 1926 1927 memcpy(&ao, a, sizeof(ao)); 1928 memcpy(a, &an, sizeof(u_int32_t)); 1929 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1930 ao % 65536, an % 65536, u); 1931 } 1932 1933 #ifdef INET6 1934 void 1935 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1936 { 1937 struct pf_addr ao; 1938 1939 PF_ACPY(&ao, a, AF_INET6); 1940 PF_ACPY(a, an, AF_INET6); 1941 1942 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1943 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1944 pf_cksum_fixup(pf_cksum_fixup(*c, 1945 ao.addr16[0], an->addr16[0], u), 1946 ao.addr16[1], an->addr16[1], u), 1947 ao.addr16[2], an->addr16[2], u), 1948 ao.addr16[3], an->addr16[3], u), 1949 ao.addr16[4], an->addr16[4], u), 1950 ao.addr16[5], an->addr16[5], u), 1951 ao.addr16[6], an->addr16[6], u), 1952 ao.addr16[7], an->addr16[7], u); 1953 } 1954 #endif /* INET6 */ 1955 1956 void 1957 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1958 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1959 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1960 { 1961 struct pf_addr oia, ooa; 1962 1963 PF_ACPY(&oia, ia, af); 1964 if (oa) 1965 PF_ACPY(&ooa, oa, af); 1966 1967 /* Change inner protocol port, fix inner protocol checksum. */ 1968 if (ip != NULL) { 1969 u_int16_t oip = *ip; 1970 u_int32_t opc = 0; 1971 1972 if (pc != NULL) 1973 opc = *pc; 1974 *ip = np; 1975 if (pc != NULL) 1976 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1977 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1978 if (pc != NULL) 1979 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1980 } 1981 /* Change inner ip address, fix inner ip and icmp checksums. */ 1982 PF_ACPY(ia, na, af); 1983 switch (af) { 1984 #ifdef INET 1985 case AF_INET: { 1986 u_int32_t oh2c = *h2c; 1987 1988 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1989 oia.addr16[0], ia->addr16[0], 0), 1990 oia.addr16[1], ia->addr16[1], 0); 1991 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1992 oia.addr16[0], ia->addr16[0], 0), 1993 oia.addr16[1], ia->addr16[1], 0); 1994 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1995 break; 1996 } 1997 #endif /* INET */ 1998 #ifdef INET6 1999 case AF_INET6: 2000 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2001 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2002 pf_cksum_fixup(pf_cksum_fixup(*ic, 2003 oia.addr16[0], ia->addr16[0], u), 2004 oia.addr16[1], ia->addr16[1], u), 2005 oia.addr16[2], ia->addr16[2], u), 2006 oia.addr16[3], ia->addr16[3], u), 2007 oia.addr16[4], ia->addr16[4], u), 2008 oia.addr16[5], ia->addr16[5], u), 2009 oia.addr16[6], ia->addr16[6], u), 2010 oia.addr16[7], ia->addr16[7], u); 2011 break; 2012 #endif /* INET6 */ 2013 } 2014 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2015 if (oa) { 2016 PF_ACPY(oa, na, af); 2017 switch (af) { 2018 #ifdef INET 2019 case AF_INET: 2020 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2021 ooa.addr16[0], oa->addr16[0], 0), 2022 ooa.addr16[1], oa->addr16[1], 0); 2023 break; 2024 #endif /* INET */ 2025 #ifdef INET6 2026 case AF_INET6: 2027 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2028 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2029 pf_cksum_fixup(pf_cksum_fixup(*ic, 2030 ooa.addr16[0], oa->addr16[0], u), 2031 ooa.addr16[1], oa->addr16[1], u), 2032 ooa.addr16[2], oa->addr16[2], u), 2033 ooa.addr16[3], oa->addr16[3], u), 2034 ooa.addr16[4], oa->addr16[4], u), 2035 ooa.addr16[5], oa->addr16[5], u), 2036 ooa.addr16[6], oa->addr16[6], u), 2037 ooa.addr16[7], oa->addr16[7], u); 2038 break; 2039 #endif /* INET6 */ 2040 } 2041 } 2042 } 2043 2044 2045 /* 2046 * Need to modulate the sequence numbers in the TCP SACK option 2047 * (credits to Krzysztof Pfaff for report and patch) 2048 */ 2049 int 2050 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2051 struct tcphdr *th, struct pf_state_peer *dst) 2052 { 2053 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2054 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2055 int copyback = 0, i, olen; 2056 struct raw_sackblock sack; 2057 2058 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2059 if (hlen < TCPOLEN_SACKLEN || 2060 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2061 return 0; 2062 2063 while (hlen >= TCPOLEN_SACKLEN) { 2064 olen = opt[1]; 2065 switch (*opt) { 2066 case TCPOPT_EOL: /* FALLTHROUGH */ 2067 case TCPOPT_NOP: 2068 opt++; 2069 hlen--; 2070 break; 2071 case TCPOPT_SACK: 2072 if (olen > hlen) 2073 olen = hlen; 2074 if (olen >= TCPOLEN_SACKLEN) { 2075 for (i = 2; i + TCPOLEN_SACK <= olen; 2076 i += TCPOLEN_SACK) { 2077 memcpy(&sack, &opt[i], sizeof(sack)); 2078 pf_change_a(&sack.rblk_start, &th->th_sum, 2079 htonl(ntohl(sack.rblk_start) - 2080 dst->seqdiff), 0); 2081 pf_change_a(&sack.rblk_end, &th->th_sum, 2082 htonl(ntohl(sack.rblk_end) - 2083 dst->seqdiff), 0); 2084 memcpy(&opt[i], &sack, sizeof(sack)); 2085 } 2086 copyback = 1; 2087 } 2088 /* FALLTHROUGH */ 2089 default: 2090 if (olen < 2) 2091 olen = 2; 2092 hlen -= olen; 2093 opt += olen; 2094 } 2095 } 2096 2097 if (copyback) 2098 m_copyback(m, off + sizeof(*th), thoptlen, opts); 2099 return (copyback); 2100 } 2101 2102 void 2103 pf_send_tcp(const struct pf_rule *r, sa_family_t af, 2104 const struct pf_addr *saddr, const struct pf_addr *daddr, 2105 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2106 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2107 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 2108 { 2109 struct mbuf *m; 2110 int len = 0, tlen; 2111 #ifdef INET 2112 struct ip *h = NULL; 2113 #endif /* INET */ 2114 #ifdef INET6 2115 struct ip6_hdr *h6 = NULL; 2116 #endif /* INET6 */ 2117 struct tcphdr *th = NULL; 2118 char *opt; 2119 2120 ASSERT_LWKT_TOKEN_HELD(&pf_token); 2121 2122 /* maximum segment size tcp option */ 2123 tlen = sizeof(struct tcphdr); 2124 if (mss) 2125 tlen += 4; 2126 2127 switch (af) { 2128 #ifdef INET 2129 case AF_INET: 2130 len = sizeof(struct ip) + tlen; 2131 break; 2132 #endif /* INET */ 2133 #ifdef INET6 2134 case AF_INET6: 2135 len = sizeof(struct ip6_hdr) + tlen; 2136 break; 2137 #endif /* INET6 */ 2138 } 2139 2140 /* 2141 * Create outgoing mbuf. 2142 * 2143 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 2144 * so make sure pf.flags is clear. 2145 */ 2146 m = m_gethdr(M_NOWAIT, MT_HEADER); 2147 if (m == NULL) { 2148 return; 2149 } 2150 if (tag) 2151 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 2152 m->m_pkthdr.pf.flags = 0; 2153 m->m_pkthdr.pf.tag = rtag; 2154 /* XXX Recheck when upgrading to > 4.4 */ 2155 m->m_pkthdr.pf.statekey = NULL; 2156 if (r != NULL && r->rtableid >= 0) 2157 m->m_pkthdr.pf.rtableid = r->rtableid; 2158 2159 #ifdef ALTQ 2160 if (r != NULL && r->qid) { 2161 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 2162 m->m_pkthdr.pf.qid = r->qid; 2163 m->m_pkthdr.pf.ecn_af = af; 2164 m->m_pkthdr.pf.hdr = mtod(m, struct ip *); 2165 } 2166 #endif /* ALTQ */ 2167 m->m_data += max_linkhdr; 2168 m->m_pkthdr.len = m->m_len = len; 2169 m->m_pkthdr.rcvif = NULL; 2170 bzero(m->m_data, len); 2171 switch (af) { 2172 #ifdef INET 2173 case AF_INET: 2174 h = mtod(m, struct ip *); 2175 2176 /* IP header fields included in the TCP checksum */ 2177 h->ip_p = IPPROTO_TCP; 2178 h->ip_len = tlen; 2179 h->ip_src.s_addr = saddr->v4.s_addr; 2180 h->ip_dst.s_addr = daddr->v4.s_addr; 2181 2182 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2183 break; 2184 #endif /* INET */ 2185 #ifdef INET6 2186 case AF_INET6: 2187 h6 = mtod(m, struct ip6_hdr *); 2188 2189 /* IP header fields included in the TCP checksum */ 2190 h6->ip6_nxt = IPPROTO_TCP; 2191 h6->ip6_plen = htons(tlen); 2192 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2193 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2194 2195 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2196 break; 2197 #endif /* INET6 */ 2198 } 2199 2200 /* TCP header */ 2201 th->th_sport = sport; 2202 th->th_dport = dport; 2203 th->th_seq = htonl(seq); 2204 th->th_ack = htonl(ack); 2205 th->th_off = tlen >> 2; 2206 th->th_flags = flags; 2207 th->th_win = htons(win); 2208 2209 if (mss) { 2210 opt = (char *)(th + 1); 2211 opt[0] = TCPOPT_MAXSEG; 2212 opt[1] = 4; 2213 mss = htons(mss); 2214 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2215 } 2216 2217 switch (af) { 2218 #ifdef INET 2219 case AF_INET: 2220 /* TCP checksum */ 2221 th->th_sum = in_cksum(m, len); 2222 2223 /* Finish the IP header */ 2224 h->ip_v = 4; 2225 h->ip_hl = sizeof(*h) >> 2; 2226 h->ip_tos = IPTOS_LOWDELAY; 2227 h->ip_len = len; 2228 h->ip_off = path_mtu_discovery ? IP_DF : 0; 2229 h->ip_ttl = ttl ? ttl : ip_defttl; 2230 h->ip_sum = 0; 2231 if (eh == NULL) { 2232 lwkt_reltoken(&pf_token); 2233 ip_output(m, NULL, NULL, 0, NULL, NULL); 2234 lwkt_gettoken(&pf_token); 2235 } else { 2236 struct route ro; 2237 struct rtentry rt; 2238 struct ether_header *e = (void *)ro.ro_dst.sa_data; 2239 2240 if (ifp == NULL) { 2241 m_freem(m); 2242 return; 2243 } 2244 rt.rt_ifp = ifp; 2245 ro.ro_rt = &rt; 2246 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 2247 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 2248 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 2249 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 2250 e->ether_type = eh->ether_type; 2251 /* XXX_IMPORT: later */ 2252 lwkt_reltoken(&pf_token); 2253 ip_output(m, NULL, &ro, 0, NULL, NULL); 2254 lwkt_gettoken(&pf_token); 2255 } 2256 break; 2257 #endif /* INET */ 2258 #ifdef INET6 2259 case AF_INET6: 2260 /* TCP checksum */ 2261 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2262 sizeof(struct ip6_hdr), tlen); 2263 2264 h6->ip6_vfc |= IPV6_VERSION; 2265 h6->ip6_hlim = IPV6_DEFHLIM; 2266 2267 lwkt_reltoken(&pf_token); 2268 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 2269 lwkt_gettoken(&pf_token); 2270 break; 2271 #endif /* INET6 */ 2272 } 2273 } 2274 2275 void 2276 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2277 struct pf_rule *r) 2278 { 2279 struct mbuf *m0; 2280 2281 /* 2282 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 2283 * so make sure pf.flags is clear. 2284 */ 2285 if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL) 2286 return; 2287 2288 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 2289 m0->m_pkthdr.pf.flags = 0; 2290 /* XXX Re-Check when Upgrading to > 4.4 */ 2291 m0->m_pkthdr.pf.statekey = NULL; 2292 2293 if (r->rtableid >= 0) 2294 m0->m_pkthdr.pf.rtableid = r->rtableid; 2295 2296 #ifdef ALTQ 2297 if (r->qid) { 2298 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 2299 m0->m_pkthdr.pf.qid = r->qid; 2300 m0->m_pkthdr.pf.ecn_af = af; 2301 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *); 2302 } 2303 #endif /* ALTQ */ 2304 2305 switch (af) { 2306 #ifdef INET 2307 case AF_INET: 2308 icmp_error(m0, type, code, 0, 0); 2309 break; 2310 #endif /* INET */ 2311 #ifdef INET6 2312 case AF_INET6: 2313 icmp6_error(m0, type, code, 0); 2314 break; 2315 #endif /* INET6 */ 2316 } 2317 } 2318 2319 /* 2320 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2321 * If n is 0, they match if they are equal. If n is != 0, they match if they 2322 * are different. 2323 */ 2324 int 2325 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2326 struct pf_addr *b, sa_family_t af) 2327 { 2328 int match = 0; 2329 2330 switch (af) { 2331 #ifdef INET 2332 case AF_INET: 2333 if ((a->addr32[0] & m->addr32[0]) == 2334 (b->addr32[0] & m->addr32[0])) 2335 match++; 2336 break; 2337 #endif /* INET */ 2338 #ifdef INET6 2339 case AF_INET6: 2340 if (((a->addr32[0] & m->addr32[0]) == 2341 (b->addr32[0] & m->addr32[0])) && 2342 ((a->addr32[1] & m->addr32[1]) == 2343 (b->addr32[1] & m->addr32[1])) && 2344 ((a->addr32[2] & m->addr32[2]) == 2345 (b->addr32[2] & m->addr32[2])) && 2346 ((a->addr32[3] & m->addr32[3]) == 2347 (b->addr32[3] & m->addr32[3]))) 2348 match++; 2349 break; 2350 #endif /* INET6 */ 2351 } 2352 if (match) { 2353 if (n) 2354 return (0); 2355 else 2356 return (1); 2357 } else { 2358 if (n) 2359 return (1); 2360 else 2361 return (0); 2362 } 2363 } 2364 2365 /* 2366 * Return 1 if b <= a <= e, otherwise return 0. 2367 */ 2368 int 2369 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2370 struct pf_addr *a, sa_family_t af) 2371 { 2372 switch (af) { 2373 #ifdef INET 2374 case AF_INET: 2375 if ((a->addr32[0] < b->addr32[0]) || 2376 (a->addr32[0] > e->addr32[0])) 2377 return (0); 2378 break; 2379 #endif /* INET */ 2380 #ifdef INET6 2381 case AF_INET6: { 2382 int i; 2383 2384 /* check a >= b */ 2385 for (i = 0; i < 4; ++i) 2386 if (a->addr32[i] > b->addr32[i]) 2387 break; 2388 else if (a->addr32[i] < b->addr32[i]) 2389 return (0); 2390 /* check a <= e */ 2391 for (i = 0; i < 4; ++i) 2392 if (a->addr32[i] < e->addr32[i]) 2393 break; 2394 else if (a->addr32[i] > e->addr32[i]) 2395 return (0); 2396 break; 2397 } 2398 #endif /* INET6 */ 2399 } 2400 return (1); 2401 } 2402 2403 int 2404 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2405 { 2406 switch (op) { 2407 case PF_OP_IRG: 2408 return ((p > a1) && (p < a2)); 2409 case PF_OP_XRG: 2410 return ((p < a1) || (p > a2)); 2411 case PF_OP_RRG: 2412 return ((p >= a1) && (p <= a2)); 2413 case PF_OP_EQ: 2414 return (p == a1); 2415 case PF_OP_NE: 2416 return (p != a1); 2417 case PF_OP_LT: 2418 return (p < a1); 2419 case PF_OP_LE: 2420 return (p <= a1); 2421 case PF_OP_GT: 2422 return (p > a1); 2423 case PF_OP_GE: 2424 return (p >= a1); 2425 } 2426 return (0); /* never reached */ 2427 } 2428 2429 int 2430 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2431 { 2432 a1 = ntohs(a1); 2433 a2 = ntohs(a2); 2434 p = ntohs(p); 2435 return (pf_match(op, a1, a2, p)); 2436 } 2437 2438 int 2439 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2440 { 2441 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2442 return (0); 2443 return (pf_match(op, a1, a2, u)); 2444 } 2445 2446 int 2447 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2448 { 2449 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2450 return (0); 2451 return (pf_match(op, a1, a2, g)); 2452 } 2453 2454 int 2455 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag) 2456 { 2457 if (*tag == -1) 2458 *tag = m->m_pkthdr.pf.tag; 2459 2460 return ((!r->match_tag_not && r->match_tag == *tag) || 2461 (r->match_tag_not && r->match_tag != *tag)); 2462 } 2463 2464 int 2465 pf_tag_packet(struct mbuf *m, int tag, int rtableid) 2466 { 2467 if (tag <= 0 && rtableid < 0) 2468 return (0); 2469 2470 if (tag > 0) 2471 m->m_pkthdr.pf.tag = tag; 2472 if (rtableid >= 0) 2473 m->m_pkthdr.pf.rtableid = rtableid; 2474 2475 return (0); 2476 } 2477 2478 void 2479 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2480 struct pf_rule **r, struct pf_rule **a, int *match) 2481 { 2482 struct pf_anchor_stackframe *f; 2483 2484 (*r)->anchor->match = 0; 2485 if (match) 2486 *match = 0; 2487 if (*depth >= NELEM(pf_anchor_stack)) { 2488 kprintf("pf_step_into_anchor: stack overflow\n"); 2489 *r = TAILQ_NEXT(*r, entries); 2490 return; 2491 } else if (*depth == 0 && a != NULL) 2492 *a = *r; 2493 f = pf_anchor_stack + (*depth)++; 2494 f->rs = *rs; 2495 f->r = *r; 2496 if ((*r)->anchor_wildcard) { 2497 f->parent = &(*r)->anchor->children; 2498 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2499 NULL) { 2500 *r = NULL; 2501 return; 2502 } 2503 *rs = &f->child->ruleset; 2504 } else { 2505 f->parent = NULL; 2506 f->child = NULL; 2507 *rs = &(*r)->anchor->ruleset; 2508 } 2509 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2510 } 2511 2512 int 2513 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2514 struct pf_rule **r, struct pf_rule **a, int *match) 2515 { 2516 struct pf_anchor_stackframe *f; 2517 int quick = 0; 2518 2519 do { 2520 if (*depth <= 0) 2521 break; 2522 f = pf_anchor_stack + *depth - 1; 2523 if (f->parent != NULL && f->child != NULL) { 2524 if (f->child->match || 2525 (match != NULL && *match)) { 2526 f->r->anchor->match = 1; 2527 *match = 0; 2528 } 2529 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2530 if (f->child != NULL) { 2531 *rs = &f->child->ruleset; 2532 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2533 if (*r == NULL) 2534 continue; 2535 else 2536 break; 2537 } 2538 } 2539 (*depth)--; 2540 if (*depth == 0 && a != NULL) 2541 *a = NULL; 2542 *rs = f->rs; 2543 if (f->r->anchor->match || (match != NULL && *match)) 2544 quick = f->r->quick; 2545 *r = TAILQ_NEXT(f->r, entries); 2546 } while (*r == NULL); 2547 2548 return (quick); 2549 } 2550 2551 #ifdef INET6 2552 void 2553 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2554 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2555 { 2556 switch (af) { 2557 #ifdef INET 2558 case AF_INET: 2559 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2560 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2561 break; 2562 #endif /* INET */ 2563 case AF_INET6: 2564 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2565 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2566 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2567 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2568 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2569 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2570 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2571 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2572 break; 2573 } 2574 } 2575 2576 void 2577 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2578 { 2579 switch (af) { 2580 #ifdef INET 2581 case AF_INET: 2582 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2583 break; 2584 #endif /* INET */ 2585 case AF_INET6: 2586 if (addr->addr32[3] == 0xffffffff) { 2587 addr->addr32[3] = 0; 2588 if (addr->addr32[2] == 0xffffffff) { 2589 addr->addr32[2] = 0; 2590 if (addr->addr32[1] == 0xffffffff) { 2591 addr->addr32[1] = 0; 2592 addr->addr32[0] = 2593 htonl(ntohl(addr->addr32[0]) + 1); 2594 } else 2595 addr->addr32[1] = 2596 htonl(ntohl(addr->addr32[1]) + 1); 2597 } else 2598 addr->addr32[2] = 2599 htonl(ntohl(addr->addr32[2]) + 1); 2600 } else 2601 addr->addr32[3] = 2602 htonl(ntohl(addr->addr32[3]) + 1); 2603 break; 2604 } 2605 } 2606 #endif /* INET6 */ 2607 2608 #define mix(a,b,c) \ 2609 do { \ 2610 a -= b; a -= c; a ^= (c >> 13); \ 2611 b -= c; b -= a; b ^= (a << 8); \ 2612 c -= a; c -= b; c ^= (b >> 13); \ 2613 a -= b; a -= c; a ^= (c >> 12); \ 2614 b -= c; b -= a; b ^= (a << 16); \ 2615 c -= a; c -= b; c ^= (b >> 5); \ 2616 a -= b; a -= c; a ^= (c >> 3); \ 2617 b -= c; b -= a; b ^= (a << 10); \ 2618 c -= a; c -= b; c ^= (b >> 15); \ 2619 } while (0) 2620 2621 /* 2622 * hash function based on bridge_hash in if_bridge.c 2623 */ 2624 void 2625 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2626 struct pf_poolhashkey *key, sa_family_t af) 2627 { 2628 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2629 2630 switch (af) { 2631 #ifdef INET 2632 case AF_INET: 2633 a += inaddr->addr32[0]; 2634 b += key->key32[1]; 2635 mix(a, b, c); 2636 hash->addr32[0] = c + key->key32[2]; 2637 break; 2638 #endif /* INET */ 2639 #ifdef INET6 2640 case AF_INET6: 2641 a += inaddr->addr32[0]; 2642 b += inaddr->addr32[2]; 2643 mix(a, b, c); 2644 hash->addr32[0] = c; 2645 a += inaddr->addr32[1]; 2646 b += inaddr->addr32[3]; 2647 c += key->key32[1]; 2648 mix(a, b, c); 2649 hash->addr32[1] = c; 2650 a += inaddr->addr32[2]; 2651 b += inaddr->addr32[1]; 2652 c += key->key32[2]; 2653 mix(a, b, c); 2654 hash->addr32[2] = c; 2655 a += inaddr->addr32[3]; 2656 b += inaddr->addr32[0]; 2657 c += key->key32[3]; 2658 mix(a, b, c); 2659 hash->addr32[3] = c; 2660 break; 2661 #endif /* INET6 */ 2662 } 2663 } 2664 2665 int 2666 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2667 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2668 { 2669 unsigned char hash[16]; 2670 struct pf_pool *rpool = &r->rpool; 2671 struct pf_pooladdr *acur = rpool->cur; 2672 struct pf_pooladdr *cur; 2673 struct pf_addr *raddr; 2674 struct pf_addr *rmask; 2675 struct pf_addr counter; 2676 struct pf_src_node k; 2677 int cpu = mycpu->gd_cpuid; 2678 int tblidx; 2679 2680 bzero(hash, sizeof(hash)); /* avoid gcc warnings */ 2681 2682 /* 2683 * NOTE! rpool->cur and rpool->tblidx can be iterators and thus 2684 * may represent a SMP race due to the shared nature of the 2685 * rpool structure. We allow the race and ensure that updates 2686 * do not create a fatal condition. 2687 */ 2688 cpu_ccfence(); 2689 cur = acur; 2690 raddr = &cur->addr.v.a.addr; 2691 rmask = &cur->addr.v.a.mask; 2692 2693 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2694 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2695 k.af = af; 2696 PF_ACPY(&k.addr, saddr, af); 2697 if (r->rule_flag & PFRULE_RULESRCTRACK || 2698 r->rpool.opts & PF_POOL_STICKYADDR) 2699 k.rule.ptr = r; 2700 else 2701 k.rule.ptr = NULL; 2702 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2703 *sn = RB_FIND(pf_src_tree, &tree_src_tracking[cpu], &k); 2704 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2705 PF_ACPY(naddr, &(*sn)->raddr, af); 2706 if (pf_status.debug >= PF_DEBUG_MISC) { 2707 kprintf("pf_map_addr: src tracking maps "); 2708 pf_print_host(&k.addr, 0, af); 2709 kprintf(" to "); 2710 pf_print_host(naddr, 0, af); 2711 kprintf("\n"); 2712 } 2713 return (0); 2714 } 2715 } 2716 2717 if (cur->addr.type == PF_ADDR_NOROUTE) 2718 return (1); 2719 if (cur->addr.type == PF_ADDR_DYNIFTL) { 2720 switch (af) { 2721 #ifdef INET 2722 case AF_INET: 2723 if (cur->addr.p.dyn->pfid_acnt4 < 1 && 2724 (rpool->opts & PF_POOL_TYPEMASK) != 2725 PF_POOL_ROUNDROBIN) 2726 return (1); 2727 raddr = &cur->addr.p.dyn->pfid_addr4; 2728 rmask = &cur->addr.p.dyn->pfid_mask4; 2729 break; 2730 #endif /* INET */ 2731 #ifdef INET6 2732 case AF_INET6: 2733 if (cur->addr.p.dyn->pfid_acnt6 < 1 && 2734 (rpool->opts & PF_POOL_TYPEMASK) != 2735 PF_POOL_ROUNDROBIN) 2736 return (1); 2737 raddr = &cur->addr.p.dyn->pfid_addr6; 2738 rmask = &cur->addr.p.dyn->pfid_mask6; 2739 break; 2740 #endif /* INET6 */ 2741 } 2742 } else if (cur->addr.type == PF_ADDR_TABLE) { 2743 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2744 return (1); /* unsupported */ 2745 } else { 2746 raddr = &cur->addr.v.a.addr; 2747 rmask = &cur->addr.v.a.mask; 2748 } 2749 2750 switch (rpool->opts & PF_POOL_TYPEMASK) { 2751 case PF_POOL_NONE: 2752 PF_ACPY(naddr, raddr, af); 2753 break; 2754 case PF_POOL_BITMASK: 2755 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2756 break; 2757 case PF_POOL_RANDOM: 2758 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2759 switch (af) { 2760 #ifdef INET 2761 case AF_INET: 2762 counter.addr32[0] = htonl(karc4random()); 2763 break; 2764 #endif /* INET */ 2765 #ifdef INET6 2766 case AF_INET6: 2767 if (rmask->addr32[3] != 0xffffffff) 2768 counter.addr32[3] = 2769 htonl(karc4random()); 2770 else 2771 break; 2772 if (rmask->addr32[2] != 0xffffffff) 2773 counter.addr32[2] = 2774 htonl(karc4random()); 2775 else 2776 break; 2777 if (rmask->addr32[1] != 0xffffffff) 2778 counter.addr32[1] = 2779 htonl(karc4random()); 2780 else 2781 break; 2782 if (rmask->addr32[0] != 0xffffffff) 2783 counter.addr32[0] = 2784 htonl(karc4random()); 2785 break; 2786 #endif /* INET6 */ 2787 } 2788 PF_POOLMASK(naddr, raddr, rmask, &counter, af); 2789 PF_ACPY(init_addr, naddr, af); 2790 2791 } else { 2792 counter = rpool->counter; 2793 cpu_ccfence(); 2794 PF_AINC(&counter, af); 2795 PF_POOLMASK(naddr, raddr, rmask, &counter, af); 2796 rpool->counter = counter; 2797 } 2798 break; 2799 case PF_POOL_SRCHASH: 2800 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2801 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2802 break; 2803 case PF_POOL_ROUNDROBIN: 2804 tblidx = rpool->tblidx; 2805 counter = rpool->counter; 2806 if (cur->addr.type == PF_ADDR_TABLE) { 2807 if (!pfr_pool_get(cur->addr.p.tbl, 2808 &tblidx, &counter, 2809 &raddr, &rmask, af)) { 2810 goto get_addr; 2811 } 2812 } else if (cur->addr.type == PF_ADDR_DYNIFTL) { 2813 if (!pfr_pool_get(cur->addr.p.dyn->pfid_kt, 2814 &tblidx, &counter, 2815 &raddr, &rmask, af)) { 2816 goto get_addr; 2817 } 2818 } else if (pf_match_addr(0, raddr, rmask, 2819 &counter, af)) { 2820 goto get_addr; 2821 } 2822 2823 try_next: 2824 if ((cur = TAILQ_NEXT(cur, entries)) == NULL) 2825 cur = TAILQ_FIRST(&rpool->list); 2826 if (cur->addr.type == PF_ADDR_TABLE) { 2827 tblidx = -1; 2828 if (pfr_pool_get(cur->addr.p.tbl, 2829 &tblidx, &counter, 2830 &raddr, &rmask, af)) { 2831 /* table contains no address of type 'af' */ 2832 if (cur != acur) 2833 goto try_next; 2834 return (1); 2835 } 2836 } else if (cur->addr.type == PF_ADDR_DYNIFTL) { 2837 tblidx = -1; 2838 if (pfr_pool_get(cur->addr.p.dyn->pfid_kt, 2839 &tblidx, &counter, 2840 &raddr, &rmask, af)) { 2841 /* table contains no address of type 'af' */ 2842 if (cur != acur) 2843 goto try_next; 2844 return (1); 2845 } 2846 } else { 2847 raddr = &cur->addr.v.a.addr; 2848 rmask = &cur->addr.v.a.mask; 2849 PF_ACPY(&counter, raddr, af); 2850 } 2851 2852 get_addr: 2853 rpool->cur = cur; 2854 rpool->tblidx = tblidx; 2855 PF_ACPY(naddr, &counter, af); 2856 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2857 PF_ACPY(init_addr, naddr, af); 2858 PF_AINC(&counter, af); 2859 rpool->counter = counter; 2860 break; 2861 } 2862 if (*sn != NULL) 2863 PF_ACPY(&(*sn)->raddr, naddr, af); 2864 2865 if (pf_status.debug >= PF_DEBUG_MISC && 2866 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2867 kprintf("pf_map_addr: selected address "); 2868 pf_print_host(naddr, 0, af); 2869 kprintf("\n"); 2870 } 2871 2872 return (0); 2873 } 2874 2875 int 2876 pf_get_sport(struct pf_pdesc *pd, sa_family_t af, 2877 u_int8_t proto, struct pf_rule *r, 2878 struct pf_addr *saddr, struct pf_addr *daddr, 2879 u_int16_t sport, u_int16_t dport, 2880 struct pf_addr *naddr, u_int16_t *nport, 2881 u_int16_t low, u_int16_t high, struct pf_src_node **sn) 2882 { 2883 struct pf_state_key_cmp key; 2884 struct pf_addr init_addr; 2885 u_int16_t cut; 2886 u_int32_t hash_base = 0; 2887 int do_hash = 0; 2888 2889 bzero(&init_addr, sizeof(init_addr)); 2890 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2891 return (1); 2892 2893 if (proto == IPPROTO_ICMP) { 2894 low = 1; 2895 high = 65535; 2896 } 2897 2898 bzero(&key, sizeof(key)); 2899 key.af = af; 2900 key.proto = proto; 2901 key.port[0] = dport; 2902 PF_ACPY(&key.addr[0], daddr, key.af); 2903 2904 do { 2905 PF_ACPY(&key.addr[1], naddr, key.af); 2906 2907 /* 2908 * We want to select a port that calculates to a toeplitz hash 2909 * that masks to the same cpu, otherwise the response may 2910 * not see the new state. 2911 * 2912 * We can still do this even if the kernel is disregarding 2913 * the hash and vectoring the packets to a specific cpu, 2914 * but it will reduce the number of ports we can use. 2915 */ 2916 switch(af) { 2917 case AF_INET: 2918 if (proto == IPPROTO_TCP) { 2919 do_hash = 1; 2920 hash_base = toeplitz_piecemeal_port(dport) ^ 2921 toeplitz_piecemeal_addr(daddr->v4.s_addr) ^ 2922 toeplitz_piecemeal_addr(naddr->v4.s_addr); 2923 } 2924 break; 2925 case AF_INET6: 2926 /* XXX TODO XXX */ 2927 default: 2928 /* XXX TODO XXX */ 2929 break; 2930 } 2931 2932 /* 2933 * port search; start random, step; 2934 * similar 2 portloop in in_pcbbind 2935 * 2936 * WARNING! We try to match such that the kernel will 2937 * dispatch the translated host/port to the same 2938 * cpu, but this might not be possible. 2939 * 2940 * In the case where the port is fixed, or for the 2941 * UDP case (whos toeplitz does not incorporate the 2942 * port), we set not_cpu_localized which ultimately 2943 * causes the pf_state_tree element 2944 * 2945 * XXX fixed ports present a problem for cpu localization. 2946 */ 2947 if (!(proto == IPPROTO_TCP || 2948 proto == IPPROTO_UDP || 2949 proto == IPPROTO_ICMP)) { 2950 /* 2951 * non-specific protocol, leave port intact. 2952 */ 2953 key.port[1] = sport; 2954 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 2955 *nport = sport; 2956 pd->not_cpu_localized = 1; 2957 return (0); 2958 } 2959 } else if (low == 0 && high == 0) { 2960 /* 2961 * static-port same as originator. 2962 */ 2963 key.port[1] = sport; 2964 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 2965 *nport = sport; 2966 pd->not_cpu_localized = 1; 2967 return (0); 2968 } 2969 } else if (low == high) { 2970 /* 2971 * specific port as specified. 2972 */ 2973 key.port[1] = htons(low); 2974 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 2975 *nport = htons(low); 2976 pd->not_cpu_localized = 1; 2977 return (0); 2978 } 2979 } else { 2980 /* 2981 * normal dynamic port 2982 */ 2983 u_int16_t tmp; 2984 2985 if (low > high) { 2986 tmp = low; 2987 low = high; 2988 high = tmp; 2989 } 2990 /* low < high */ 2991 cut = htonl(karc4random()) % (1 + high - low) + low; 2992 /* low <= cut <= high */ 2993 for (tmp = cut; tmp <= high; ++(tmp)) { 2994 key.port[1] = htons(tmp); 2995 if (do_hash) { 2996 uint32_t hash; 2997 2998 hash = hash_base ^ 2999 toeplitz_piecemeal_port(key.port[1]); 3000 if (netisr_hashcpu(hash) != mycpuid) 3001 continue; 3002 } 3003 if (pf_find_state_all(&key, PF_IN, NULL) == 3004 NULL && !in_baddynamic(tmp, proto)) { 3005 if (proto == IPPROTO_UDP) 3006 pd->not_cpu_localized = 1; 3007 *nport = htons(tmp); 3008 return (0); 3009 } 3010 } 3011 for (tmp = cut - 1; tmp >= low; --(tmp)) { 3012 key.port[1] = htons(tmp); 3013 if (do_hash) { 3014 uint32_t hash; 3015 3016 hash = hash_base ^ 3017 toeplitz_piecemeal_port(key.port[1]); 3018 if (netisr_hashcpu(hash) != mycpuid) 3019 continue; 3020 } 3021 if (pf_find_state_all(&key, PF_IN, NULL) == 3022 NULL && !in_baddynamic(tmp, proto)) { 3023 if (proto == IPPROTO_UDP) 3024 pd->not_cpu_localized = 1; 3025 *nport = htons(tmp); 3026 return (0); 3027 } 3028 } 3029 } 3030 3031 /* 3032 * Next address 3033 */ 3034 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 3035 case PF_POOL_RANDOM: 3036 case PF_POOL_ROUNDROBIN: 3037 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 3038 return (1); 3039 break; 3040 case PF_POOL_NONE: 3041 case PF_POOL_SRCHASH: 3042 case PF_POOL_BITMASK: 3043 default: 3044 return (1); 3045 } 3046 } while (! PF_AEQ(&init_addr, naddr, af) ); 3047 return (1); /* none available */ 3048 } 3049 3050 struct pf_rule * 3051 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 3052 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 3053 struct pf_addr *daddr, u_int16_t dport, int rs_num) 3054 { 3055 struct pf_rule *r, *rm = NULL; 3056 struct pf_ruleset *ruleset = NULL; 3057 int tag = -1; 3058 int rtableid = -1; 3059 int asd = 0; 3060 3061 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 3062 while (r && rm == NULL) { 3063 struct pf_rule_addr *src = NULL, *dst = NULL; 3064 struct pf_addr_wrap *xdst = NULL; 3065 struct pf_pooladdr *cur; 3066 3067 if (r->action == PF_BINAT && direction == PF_IN) { 3068 src = &r->dst; 3069 cur = r->rpool.cur; /* SMP race possible */ 3070 cpu_ccfence(); 3071 if (cur) 3072 xdst = &cur->addr; 3073 } else { 3074 src = &r->src; 3075 dst = &r->dst; 3076 } 3077 3078 r->evaluations++; 3079 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3080 r = r->skip[PF_SKIP_IFP].ptr; 3081 else if (r->direction && r->direction != direction) 3082 r = r->skip[PF_SKIP_DIR].ptr; 3083 else if (r->af && r->af != pd->af) 3084 r = r->skip[PF_SKIP_AF].ptr; 3085 else if (r->proto && r->proto != pd->proto) 3086 r = r->skip[PF_SKIP_PROTO].ptr; 3087 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 3088 src->neg, kif)) 3089 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 3090 PF_SKIP_DST_ADDR].ptr; 3091 else if (src->port_op && !pf_match_port(src->port_op, 3092 src->port[0], src->port[1], sport)) 3093 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 3094 PF_SKIP_DST_PORT].ptr; 3095 else if (dst != NULL && 3096 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 3097 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3098 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 3099 0, NULL)) 3100 r = TAILQ_NEXT(r, entries); 3101 else if (dst != NULL && dst->port_op && 3102 !pf_match_port(dst->port_op, dst->port[0], 3103 dst->port[1], dport)) 3104 r = r->skip[PF_SKIP_DST_PORT].ptr; 3105 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3106 r = TAILQ_NEXT(r, entries); 3107 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 3108 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 3109 off, pd->hdr.tcp), r->os_fingerprint))) 3110 r = TAILQ_NEXT(r, entries); 3111 else { 3112 if (r->tag) 3113 tag = r->tag; 3114 if (r->rtableid >= 0) 3115 rtableid = r->rtableid; 3116 if (r->anchor == NULL) { 3117 rm = r; 3118 } else 3119 pf_step_into_anchor(&asd, &ruleset, rs_num, 3120 &r, NULL, NULL); 3121 } 3122 if (r == NULL) 3123 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 3124 NULL, NULL); 3125 } 3126 if (pf_tag_packet(m, tag, rtableid)) 3127 return (NULL); 3128 if (rm != NULL && (rm->action == PF_NONAT || 3129 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 3130 return (NULL); 3131 return (rm); 3132 } 3133 3134 struct pf_rule * 3135 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 3136 struct pfi_kif *kif, struct pf_src_node **sn, 3137 struct pf_state_key **skw, struct pf_state_key **sks, 3138 struct pf_state_key **skp, struct pf_state_key **nkp, 3139 struct pf_addr *saddr, struct pf_addr *daddr, 3140 u_int16_t sport, u_int16_t dport) 3141 { 3142 struct pf_rule *r = NULL; 3143 3144 if (direction == PF_OUT) { 3145 r = pf_match_translation(pd, m, off, direction, kif, saddr, 3146 sport, daddr, dport, PF_RULESET_BINAT); 3147 if (r == NULL) 3148 r = pf_match_translation(pd, m, off, direction, kif, 3149 saddr, sport, daddr, dport, PF_RULESET_NAT); 3150 } else { 3151 r = pf_match_translation(pd, m, off, direction, kif, saddr, 3152 sport, daddr, dport, PF_RULESET_RDR); 3153 if (r == NULL) 3154 r = pf_match_translation(pd, m, off, direction, kif, 3155 saddr, sport, daddr, dport, PF_RULESET_BINAT); 3156 } 3157 3158 if (r != NULL) { 3159 struct pf_addr *naddr; 3160 u_int16_t *nport; 3161 3162 if (pf_state_key_setup(pd, r, skw, sks, skp, nkp, 3163 saddr, daddr, sport, dport)) 3164 return r; 3165 3166 /* XXX We only modify one side for now. */ 3167 naddr = &(*nkp)->addr[1]; 3168 nport = &(*nkp)->port[1]; 3169 3170 /* 3171 * NOTE: Currently all translations will clear 3172 * BRIDGE_MBUF_TAGGED, telling the bridge to 3173 * ignore the original input encapsulation. 3174 */ 3175 switch (r->action) { 3176 case PF_NONAT: 3177 case PF_NOBINAT: 3178 case PF_NORDR: 3179 return (NULL); 3180 case PF_NAT: 3181 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 3182 if (pf_get_sport(pd, pd->af, pd->proto, r, 3183 saddr, daddr, sport, dport, 3184 naddr, nport, r->rpool.proxy_port[0], 3185 r->rpool.proxy_port[1], sn)) { 3186 DPFPRINTF(PF_DEBUG_MISC, 3187 ("pf: NAT proxy port allocation " 3188 "(%u-%u) failed\n", 3189 r->rpool.proxy_port[0], 3190 r->rpool.proxy_port[1])); 3191 return (NULL); 3192 } 3193 break; 3194 case PF_BINAT: 3195 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 3196 switch (direction) { 3197 case PF_OUT: 3198 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 3199 switch (pd->af) { 3200 #ifdef INET 3201 case AF_INET: 3202 if (r->rpool.cur->addr.p.dyn-> 3203 pfid_acnt4 < 1) 3204 return (NULL); 3205 PF_POOLMASK(naddr, 3206 &r->rpool.cur->addr.p.dyn-> 3207 pfid_addr4, 3208 &r->rpool.cur->addr.p.dyn-> 3209 pfid_mask4, 3210 saddr, AF_INET); 3211 break; 3212 #endif /* INET */ 3213 #ifdef INET6 3214 case AF_INET6: 3215 if (r->rpool.cur->addr.p.dyn-> 3216 pfid_acnt6 < 1) 3217 return (NULL); 3218 PF_POOLMASK(naddr, 3219 &r->rpool.cur->addr.p.dyn-> 3220 pfid_addr6, 3221 &r->rpool.cur->addr.p.dyn-> 3222 pfid_mask6, 3223 saddr, AF_INET6); 3224 break; 3225 #endif /* INET6 */ 3226 } 3227 } else 3228 PF_POOLMASK(naddr, 3229 &r->rpool.cur->addr.v.a.addr, 3230 &r->rpool.cur->addr.v.a.mask, 3231 saddr, pd->af); 3232 break; 3233 case PF_IN: 3234 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 3235 switch (pd->af) { 3236 #ifdef INET 3237 case AF_INET: 3238 if (r->src.addr.p.dyn-> 3239 pfid_acnt4 < 1) 3240 return (NULL); 3241 PF_POOLMASK(naddr, 3242 &r->src.addr.p.dyn-> 3243 pfid_addr4, 3244 &r->src.addr.p.dyn-> 3245 pfid_mask4, 3246 daddr, AF_INET); 3247 break; 3248 #endif /* INET */ 3249 #ifdef INET6 3250 case AF_INET6: 3251 if (r->src.addr.p.dyn-> 3252 pfid_acnt6 < 1) 3253 return (NULL); 3254 PF_POOLMASK(naddr, 3255 &r->src.addr.p.dyn-> 3256 pfid_addr6, 3257 &r->src.addr.p.dyn-> 3258 pfid_mask6, 3259 daddr, AF_INET6); 3260 break; 3261 #endif /* INET6 */ 3262 } 3263 } else 3264 PF_POOLMASK(naddr, 3265 &r->src.addr.v.a.addr, 3266 &r->src.addr.v.a.mask, daddr, 3267 pd->af); 3268 break; 3269 } 3270 break; 3271 case PF_RDR: { 3272 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 3273 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 3274 return (NULL); 3275 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 3276 PF_POOL_BITMASK) 3277 PF_POOLMASK(naddr, naddr, 3278 &r->rpool.cur->addr.v.a.mask, daddr, 3279 pd->af); 3280 3281 if (r->rpool.proxy_port[1]) { 3282 u_int32_t tmp_nport; 3283 3284 tmp_nport = ((ntohs(dport) - 3285 ntohs(r->dst.port[0])) % 3286 (r->rpool.proxy_port[1] - 3287 r->rpool.proxy_port[0] + 1)) + 3288 r->rpool.proxy_port[0]; 3289 3290 /* wrap around if necessary */ 3291 if (tmp_nport > 65535) 3292 tmp_nport -= 65535; 3293 *nport = htons((u_int16_t)tmp_nport); 3294 } else if (r->rpool.proxy_port[0]) { 3295 *nport = htons(r->rpool.proxy_port[0]); 3296 } 3297 pd->not_cpu_localized = 1; 3298 break; 3299 } 3300 default: 3301 return (NULL); 3302 } 3303 } 3304 3305 return (r); 3306 } 3307 3308 struct netmsg_hashlookup { 3309 struct netmsg_base base; 3310 struct inpcb **nm_pinp; 3311 struct inpcbinfo *nm_pcbinfo; 3312 struct pf_addr *nm_saddr; 3313 struct pf_addr *nm_daddr; 3314 uint16_t nm_sport; 3315 uint16_t nm_dport; 3316 sa_family_t nm_af; 3317 }; 3318 3319 #ifdef PF_SOCKET_LOOKUP_DOMSG 3320 static void 3321 in_pcblookup_hash_handler(netmsg_t msg) 3322 { 3323 struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg; 3324 3325 if (rmsg->nm_af == AF_INET) 3326 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo, 3327 rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4, 3328 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 3329 #ifdef INET6 3330 else 3331 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo, 3332 &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6, 3333 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 3334 #endif /* INET6 */ 3335 lwkt_replymsg(&rmsg->base.lmsg, 0); 3336 } 3337 #endif /* PF_SOCKET_LOOKUP_DOMSG */ 3338 3339 int 3340 pf_socket_lookup(int direction, struct pf_pdesc *pd) 3341 { 3342 struct pf_addr *saddr, *daddr; 3343 u_int16_t sport, dport; 3344 struct inpcbinfo *pi; 3345 struct inpcb *inp; 3346 struct netmsg_hashlookup *msg = NULL; 3347 #ifdef PF_SOCKET_LOOKUP_DOMSG 3348 struct netmsg_hashlookup msg0; 3349 #endif 3350 int pi_cpu = 0; 3351 3352 if (pd == NULL) 3353 return (-1); 3354 pd->lookup.uid = UID_MAX; 3355 pd->lookup.gid = GID_MAX; 3356 pd->lookup.pid = NO_PID; 3357 if (direction == PF_IN) { 3358 saddr = pd->src; 3359 daddr = pd->dst; 3360 } else { 3361 saddr = pd->dst; 3362 daddr = pd->src; 3363 } 3364 switch (pd->proto) { 3365 case IPPROTO_TCP: 3366 if (pd->hdr.tcp == NULL) 3367 return (-1); 3368 sport = pd->hdr.tcp->th_sport; 3369 dport = pd->hdr.tcp->th_dport; 3370 3371 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport); 3372 pi = &tcbinfo[pi_cpu]; 3373 /* 3374 * Our netstack runs lockless on MP systems 3375 * (only for TCP connections at the moment). 3376 * 3377 * As we are not allowed to read another CPU's tcbinfo, 3378 * we have to ask that CPU via remote call to search the 3379 * table for us. 3380 * 3381 * Prepare a msg iff data belongs to another CPU. 3382 */ 3383 if (pi_cpu != mycpu->gd_cpuid) { 3384 #ifdef PF_SOCKET_LOOKUP_DOMSG 3385 /* 3386 * NOTE: 3387 * 3388 * Following lwkt_domsg() is dangerous and could 3389 * lockup the network system, e.g. 3390 * 3391 * On 2 CPU system: 3392 * netisr0 domsg to netisr1 (due to lookup) 3393 * netisr1 domsg to netisr0 (due to lookup) 3394 * 3395 * We simply return -1 here, since we are probably 3396 * called before NAT, so the TCP packet should 3397 * already be on the correct CPU. 3398 */ 3399 msg = &msg0; 3400 netmsg_init(&msg->base, NULL, &curthread->td_msgport, 3401 0, in_pcblookup_hash_handler); 3402 msg->nm_pinp = &inp; 3403 msg->nm_pcbinfo = pi; 3404 msg->nm_saddr = saddr; 3405 msg->nm_sport = sport; 3406 msg->nm_daddr = daddr; 3407 msg->nm_dport = dport; 3408 msg->nm_af = pd->af; 3409 #else /* !PF_SOCKET_LOOKUP_DOMSG */ 3410 kprintf("pf_socket_lookup: tcp packet not on the " 3411 "correct cpu %d, cur cpu %d\n", 3412 pi_cpu, mycpuid); 3413 print_backtrace(-1); 3414 return -1; 3415 #endif /* PF_SOCKET_LOOKUP_DOMSG */ 3416 } 3417 break; 3418 case IPPROTO_UDP: 3419 if (pd->hdr.udp == NULL) 3420 return (-1); 3421 sport = pd->hdr.udp->uh_sport; 3422 dport = pd->hdr.udp->uh_dport; 3423 pi = &udbinfo[mycpuid]; 3424 break; 3425 default: 3426 return (-1); 3427 } 3428 if (direction != PF_IN) { 3429 u_int16_t p; 3430 3431 p = sport; 3432 sport = dport; 3433 dport = p; 3434 } 3435 switch (pd->af) { 3436 #ifdef INET6 3437 case AF_INET6: 3438 /* 3439 * Query other CPU, second part 3440 * 3441 * msg only gets initialized when: 3442 * 1) packet is TCP 3443 * 2) the info belongs to another CPU 3444 * 3445 * Use some switch/case magic to avoid code duplication. 3446 */ 3447 if (msg == NULL) { 3448 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 3449 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 3450 3451 if (inp == NULL) 3452 return (-1); 3453 break; 3454 } 3455 /* FALLTHROUGH if SMP and on other CPU */ 3456 #endif /* INET6 */ 3457 case AF_INET: 3458 if (msg != NULL) { 3459 lwkt_domsg(netisr_cpuport(pi_cpu), 3460 &msg->base.lmsg, 0); 3461 } else 3462 { 3463 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 3464 dport, INPLOOKUP_WILDCARD, NULL); 3465 } 3466 if (inp == NULL) 3467 return (-1); 3468 break; 3469 3470 default: 3471 return (-1); 3472 } 3473 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid; 3474 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0]; 3475 return (1); 3476 } 3477 3478 u_int8_t 3479 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3480 { 3481 int hlen; 3482 u_int8_t hdr[60]; 3483 u_int8_t *opt, optlen; 3484 u_int8_t wscale = 0; 3485 3486 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3487 if (hlen <= sizeof(struct tcphdr)) 3488 return (0); 3489 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3490 return (0); 3491 opt = hdr + sizeof(struct tcphdr); 3492 hlen -= sizeof(struct tcphdr); 3493 while (hlen >= 3) { 3494 switch (*opt) { 3495 case TCPOPT_EOL: 3496 case TCPOPT_NOP: 3497 ++opt; 3498 --hlen; 3499 break; 3500 case TCPOPT_WINDOW: 3501 wscale = opt[2]; 3502 if (wscale > TCP_MAX_WINSHIFT) 3503 wscale = TCP_MAX_WINSHIFT; 3504 wscale |= PF_WSCALE_FLAG; 3505 /* FALLTHROUGH */ 3506 default: 3507 optlen = opt[1]; 3508 if (optlen < 2) 3509 optlen = 2; 3510 hlen -= optlen; 3511 opt += optlen; 3512 break; 3513 } 3514 } 3515 return (wscale); 3516 } 3517 3518 u_int16_t 3519 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3520 { 3521 int hlen; 3522 u_int8_t hdr[60]; 3523 u_int8_t *opt, optlen; 3524 u_int16_t mss = tcp_mssdflt; 3525 3526 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3527 if (hlen <= sizeof(struct tcphdr)) 3528 return (0); 3529 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3530 return (0); 3531 opt = hdr + sizeof(struct tcphdr); 3532 hlen -= sizeof(struct tcphdr); 3533 while (hlen >= TCPOLEN_MAXSEG) { 3534 switch (*opt) { 3535 case TCPOPT_EOL: 3536 case TCPOPT_NOP: 3537 ++opt; 3538 --hlen; 3539 break; 3540 case TCPOPT_MAXSEG: 3541 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3542 /* FALLTHROUGH */ 3543 default: 3544 optlen = opt[1]; 3545 if (optlen < 2) 3546 optlen = 2; 3547 hlen -= optlen; 3548 opt += optlen; 3549 break; 3550 } 3551 } 3552 return (mss); 3553 } 3554 3555 u_int16_t 3556 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3557 { 3558 #ifdef INET 3559 struct sockaddr_in *dst; 3560 struct route ro; 3561 #endif /* INET */ 3562 #ifdef INET6 3563 struct sockaddr_in6 *dst6; 3564 struct route_in6 ro6; 3565 #endif /* INET6 */ 3566 struct rtentry *rt = NULL; 3567 int hlen = 0; 3568 u_int16_t mss = tcp_mssdflt; 3569 3570 switch (af) { 3571 #ifdef INET 3572 case AF_INET: 3573 hlen = sizeof(struct ip); 3574 bzero(&ro, sizeof(ro)); 3575 dst = (struct sockaddr_in *)&ro.ro_dst; 3576 dst->sin_family = AF_INET; 3577 dst->sin_len = sizeof(*dst); 3578 dst->sin_addr = addr->v4; 3579 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3580 rt = ro.ro_rt; 3581 break; 3582 #endif /* INET */ 3583 #ifdef INET6 3584 case AF_INET6: 3585 hlen = sizeof(struct ip6_hdr); 3586 bzero(&ro6, sizeof(ro6)); 3587 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3588 dst6->sin6_family = AF_INET6; 3589 dst6->sin6_len = sizeof(*dst6); 3590 dst6->sin6_addr = addr->v6; 3591 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING)); 3592 rt = ro6.ro_rt; 3593 break; 3594 #endif /* INET6 */ 3595 } 3596 3597 if (rt && rt->rt_ifp) { 3598 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3599 mss = max(tcp_mssdflt, mss); 3600 RTFREE(rt); 3601 } 3602 mss = min(mss, offer); 3603 mss = max(mss, 64); /* sanity - at least max opt space */ 3604 return (mss); 3605 } 3606 3607 void 3608 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3609 { 3610 struct pf_rule *r = s->rule.ptr; 3611 3612 s->rt_kif = NULL; 3613 if (!r->rt || r->rt == PF_FASTROUTE) 3614 return; 3615 switch (s->key[PF_SK_WIRE]->af) { 3616 #ifdef INET 3617 case AF_INET: 3618 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3619 &s->nat_src_node); 3620 s->rt_kif = r->rpool.cur->kif; 3621 break; 3622 #endif /* INET */ 3623 #ifdef INET6 3624 case AF_INET6: 3625 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3626 &s->nat_src_node); 3627 s->rt_kif = r->rpool.cur->kif; 3628 break; 3629 #endif /* INET6 */ 3630 } 3631 } 3632 3633 u_int32_t 3634 pf_tcp_iss(struct pf_pdesc *pd) 3635 { 3636 MD5_CTX ctx; 3637 u_int32_t digest[4]; 3638 3639 if (pf_tcp_secret_init == 0) { 3640 lwkt_gettoken(&pf_gtoken); 3641 if (pf_tcp_secret_init == 0) { 3642 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret)); 3643 MD5Init(&pf_tcp_secret_ctx); 3644 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret, 3645 sizeof(pf_tcp_secret)); 3646 pf_tcp_secret_init = 1; 3647 } 3648 lwkt_reltoken(&pf_gtoken); 3649 } 3650 ctx = pf_tcp_secret_ctx; 3651 3652 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3653 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3654 if (pd->af == AF_INET6) { 3655 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3656 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3657 } else { 3658 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3659 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3660 } 3661 MD5Final((u_char *)digest, &ctx); 3662 pf_tcp_iss_off += 4096; 3663 3664 return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off); 3665 } 3666 3667 int 3668 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3669 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3670 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3671 struct ifqueue *ifq, struct inpcb *inp) 3672 { 3673 struct pf_rule *nr = NULL; 3674 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3675 sa_family_t af = pd->af; 3676 struct pf_rule *r, *a = NULL; 3677 struct pf_ruleset *ruleset = NULL; 3678 struct pf_src_node *nsn = NULL; 3679 struct tcphdr *th = pd->hdr.tcp; 3680 struct pf_state_key *skw = NULL, *sks = NULL; 3681 struct pf_state_key *sk = NULL, *nk = NULL; 3682 u_short reason; 3683 int rewrite = 0, hdrlen = 0; 3684 int tag = -1, rtableid = -1; 3685 int asd = 0; 3686 int match = 0; 3687 int state_icmp = 0; 3688 u_int16_t sport = 0, dport = 0; 3689 u_int16_t bproto_sum = 0, bip_sum = 0; 3690 u_int8_t icmptype = 0, icmpcode = 0; 3691 3692 3693 if (direction == PF_IN && pf_check_congestion(ifq)) { 3694 REASON_SET(&reason, PFRES_CONGEST); 3695 return (PF_DROP); 3696 } 3697 3698 if (inp != NULL) 3699 pd->lookup.done = pf_socket_lookup(direction, pd); 3700 else if (debug_pfugidhack) { 3701 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3702 pd->lookup.done = pf_socket_lookup(direction, pd); 3703 } 3704 3705 switch (pd->proto) { 3706 case IPPROTO_TCP: 3707 sport = th->th_sport; 3708 dport = th->th_dport; 3709 hdrlen = sizeof(*th); 3710 break; 3711 case IPPROTO_UDP: 3712 sport = pd->hdr.udp->uh_sport; 3713 dport = pd->hdr.udp->uh_dport; 3714 hdrlen = sizeof(*pd->hdr.udp); 3715 break; 3716 #ifdef INET 3717 case IPPROTO_ICMP: 3718 if (pd->af != AF_INET) 3719 break; 3720 sport = dport = pd->hdr.icmp->icmp_id; 3721 hdrlen = sizeof(*pd->hdr.icmp); 3722 icmptype = pd->hdr.icmp->icmp_type; 3723 icmpcode = pd->hdr.icmp->icmp_code; 3724 3725 if (icmptype == ICMP_UNREACH || 3726 icmptype == ICMP_SOURCEQUENCH || 3727 icmptype == ICMP_REDIRECT || 3728 icmptype == ICMP_TIMXCEED || 3729 icmptype == ICMP_PARAMPROB) 3730 state_icmp++; 3731 break; 3732 #endif /* INET */ 3733 #ifdef INET6 3734 case IPPROTO_ICMPV6: 3735 if (af != AF_INET6) 3736 break; 3737 sport = dport = pd->hdr.icmp6->icmp6_id; 3738 hdrlen = sizeof(*pd->hdr.icmp6); 3739 icmptype = pd->hdr.icmp6->icmp6_type; 3740 icmpcode = pd->hdr.icmp6->icmp6_code; 3741 3742 if (icmptype == ICMP6_DST_UNREACH || 3743 icmptype == ICMP6_PACKET_TOO_BIG || 3744 icmptype == ICMP6_TIME_EXCEEDED || 3745 icmptype == ICMP6_PARAM_PROB) 3746 state_icmp++; 3747 break; 3748 #endif /* INET6 */ 3749 default: 3750 sport = dport = hdrlen = 0; 3751 break; 3752 } 3753 3754 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3755 3756 /* check packet for BINAT/NAT/RDR */ 3757 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, 3758 &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) { 3759 if (nk == NULL || sk == NULL) { 3760 REASON_SET(&reason, PFRES_MEMORY); 3761 goto cleanup; 3762 } 3763 3764 if (pd->ip_sum) 3765 bip_sum = *pd->ip_sum; 3766 3767 m->m_flags &= ~M_HASH; 3768 switch (pd->proto) { 3769 case IPPROTO_TCP: 3770 bproto_sum = th->th_sum; 3771 pd->proto_sum = &th->th_sum; 3772 3773 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3774 nk->port[pd->sidx] != sport) { 3775 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3776 &th->th_sum, &nk->addr[pd->sidx], 3777 nk->port[pd->sidx], 0, af); 3778 pd->sport = &th->th_sport; 3779 sport = th->th_sport; 3780 } 3781 3782 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3783 nk->port[pd->didx] != dport) { 3784 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3785 &th->th_sum, &nk->addr[pd->didx], 3786 nk->port[pd->didx], 0, af); 3787 dport = th->th_dport; 3788 pd->dport = &th->th_dport; 3789 } 3790 rewrite++; 3791 break; 3792 case IPPROTO_UDP: 3793 bproto_sum = pd->hdr.udp->uh_sum; 3794 pd->proto_sum = &pd->hdr.udp->uh_sum; 3795 3796 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3797 nk->port[pd->sidx] != sport) { 3798 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3799 pd->ip_sum, &pd->hdr.udp->uh_sum, 3800 &nk->addr[pd->sidx], 3801 nk->port[pd->sidx], 1, af); 3802 sport = pd->hdr.udp->uh_sport; 3803 pd->sport = &pd->hdr.udp->uh_sport; 3804 } 3805 3806 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3807 nk->port[pd->didx] != dport) { 3808 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3809 pd->ip_sum, &pd->hdr.udp->uh_sum, 3810 &nk->addr[pd->didx], 3811 nk->port[pd->didx], 1, af); 3812 dport = pd->hdr.udp->uh_dport; 3813 pd->dport = &pd->hdr.udp->uh_dport; 3814 } 3815 rewrite++; 3816 break; 3817 #ifdef INET 3818 case IPPROTO_ICMP: 3819 nk->port[0] = nk->port[1]; 3820 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3821 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3822 nk->addr[pd->sidx].v4.s_addr, 0); 3823 3824 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3825 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3826 nk->addr[pd->didx].v4.s_addr, 0); 3827 3828 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3829 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3830 pd->hdr.icmp->icmp_cksum, sport, 3831 nk->port[1], 0); 3832 pd->hdr.icmp->icmp_id = nk->port[1]; 3833 pd->sport = &pd->hdr.icmp->icmp_id; 3834 } 3835 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3836 break; 3837 #endif /* INET */ 3838 #ifdef INET6 3839 case IPPROTO_ICMPV6: 3840 nk->port[0] = nk->port[1]; 3841 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3842 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3843 &nk->addr[pd->sidx], 0); 3844 3845 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3846 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3847 &nk->addr[pd->didx], 0); 3848 rewrite++; 3849 break; 3850 #endif /* INET */ 3851 default: 3852 switch (af) { 3853 #ifdef INET 3854 case AF_INET: 3855 if (PF_ANEQ(saddr, 3856 &nk->addr[pd->sidx], AF_INET)) 3857 pf_change_a(&saddr->v4.s_addr, 3858 pd->ip_sum, 3859 nk->addr[pd->sidx].v4.s_addr, 0); 3860 3861 if (PF_ANEQ(daddr, 3862 &nk->addr[pd->didx], AF_INET)) 3863 pf_change_a(&daddr->v4.s_addr, 3864 pd->ip_sum, 3865 nk->addr[pd->didx].v4.s_addr, 0); 3866 break; 3867 #endif /* INET */ 3868 #ifdef INET6 3869 case AF_INET6: 3870 if (PF_ANEQ(saddr, 3871 &nk->addr[pd->sidx], AF_INET6)) 3872 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3873 3874 if (PF_ANEQ(daddr, 3875 &nk->addr[pd->didx], AF_INET6)) 3876 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3877 break; 3878 #endif /* INET */ 3879 } 3880 break; 3881 } 3882 if (nr->natpass) 3883 r = NULL; 3884 pd->nat_rule = nr; 3885 } 3886 3887 while (r != NULL) { 3888 r->evaluations++; 3889 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3890 r = r->skip[PF_SKIP_IFP].ptr; 3891 else if (r->direction && r->direction != direction) 3892 r = r->skip[PF_SKIP_DIR].ptr; 3893 else if (r->af && r->af != af) 3894 r = r->skip[PF_SKIP_AF].ptr; 3895 else if (r->proto && r->proto != pd->proto) 3896 r = r->skip[PF_SKIP_PROTO].ptr; 3897 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3898 r->src.neg, kif)) 3899 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3900 /* tcp/udp only. port_op always 0 in other cases */ 3901 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3902 r->src.port[0], r->src.port[1], sport)) 3903 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3904 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3905 r->dst.neg, NULL)) 3906 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3907 /* tcp/udp only. port_op always 0 in other cases */ 3908 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3909 r->dst.port[0], r->dst.port[1], dport)) 3910 r = r->skip[PF_SKIP_DST_PORT].ptr; 3911 /* icmp only. type always 0 in other cases */ 3912 else if (r->type && r->type != icmptype + 1) 3913 r = TAILQ_NEXT(r, entries); 3914 /* icmp only. type always 0 in other cases */ 3915 else if (r->code && r->code != icmpcode + 1) 3916 r = TAILQ_NEXT(r, entries); 3917 else if (r->tos && !(r->tos == pd->tos)) 3918 r = TAILQ_NEXT(r, entries); 3919 else if (r->rule_flag & PFRULE_FRAGMENT) 3920 r = TAILQ_NEXT(r, entries); 3921 else if (pd->proto == IPPROTO_TCP && 3922 (r->flagset & th->th_flags) != r->flags) 3923 r = TAILQ_NEXT(r, entries); 3924 /* tcp/udp only. uid.op always 0 in other cases */ 3925 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3926 pf_socket_lookup(direction, pd), 1)) && 3927 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3928 pd->lookup.uid)) 3929 r = TAILQ_NEXT(r, entries); 3930 /* tcp/udp only. gid.op always 0 in other cases */ 3931 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3932 pf_socket_lookup(direction, pd), 1)) && 3933 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3934 pd->lookup.gid)) 3935 r = TAILQ_NEXT(r, entries); 3936 else if (r->prob && 3937 r->prob <= karc4random()) 3938 r = TAILQ_NEXT(r, entries); 3939 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3940 r = TAILQ_NEXT(r, entries); 3941 else if (r->os_fingerprint != PF_OSFP_ANY && 3942 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3943 pf_osfp_fingerprint(pd, m, off, th), 3944 r->os_fingerprint))) 3945 r = TAILQ_NEXT(r, entries); 3946 else { 3947 if (r->tag) 3948 tag = r->tag; 3949 if (r->rtableid >= 0) 3950 rtableid = r->rtableid; 3951 if (r->anchor == NULL) { 3952 match = 1; 3953 *rm = r; 3954 *am = a; 3955 *rsm = ruleset; 3956 if ((*rm)->quick) 3957 break; 3958 r = TAILQ_NEXT(r, entries); 3959 } else 3960 pf_step_into_anchor(&asd, &ruleset, 3961 PF_RULESET_FILTER, &r, &a, &match); 3962 } 3963 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3964 PF_RULESET_FILTER, &r, &a, &match)) 3965 break; 3966 } 3967 r = *rm; 3968 a = *am; 3969 ruleset = *rsm; 3970 3971 REASON_SET(&reason, PFRES_MATCH); 3972 3973 if (r->log || (nr != NULL && nr->log)) { 3974 if (rewrite) 3975 m_copyback(m, off, hdrlen, pd->hdr.any); 3976 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3977 a, ruleset, pd); 3978 } 3979 3980 if ((r->action == PF_DROP) && 3981 ((r->rule_flag & PFRULE_RETURNRST) || 3982 (r->rule_flag & PFRULE_RETURNICMP) || 3983 (r->rule_flag & PFRULE_RETURN))) { 3984 /* undo NAT changes, if they have taken place */ 3985 if (nr != NULL) { 3986 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3987 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3988 if (pd->sport) 3989 *pd->sport = sk->port[pd->sidx]; 3990 if (pd->dport) 3991 *pd->dport = sk->port[pd->didx]; 3992 if (pd->proto_sum) 3993 *pd->proto_sum = bproto_sum; 3994 if (pd->ip_sum) 3995 *pd->ip_sum = bip_sum; 3996 m_copyback(m, off, hdrlen, pd->hdr.any); 3997 } 3998 if (pd->proto == IPPROTO_TCP && 3999 ((r->rule_flag & PFRULE_RETURNRST) || 4000 (r->rule_flag & PFRULE_RETURN)) && 4001 !(th->th_flags & TH_RST)) { 4002 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 4003 int len = 0; 4004 struct ip *h4; 4005 #ifdef INET6 4006 struct ip6_hdr *h6; 4007 #endif 4008 switch (af) { 4009 case AF_INET: 4010 h4 = mtod(m, struct ip *); 4011 len = h4->ip_len - off; 4012 break; 4013 #ifdef INET6 4014 case AF_INET6: 4015 h6 = mtod(m, struct ip6_hdr *); 4016 len = h6->ip6_plen - (off - sizeof(*h6)); 4017 break; 4018 #endif 4019 } 4020 4021 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 4022 REASON_SET(&reason, PFRES_PROTCKSUM); 4023 else { 4024 if (th->th_flags & TH_SYN) 4025 ack++; 4026 if (th->th_flags & TH_FIN) 4027 ack++; 4028 pf_send_tcp(r, af, pd->dst, 4029 pd->src, th->th_dport, th->th_sport, 4030 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 4031 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 4032 } 4033 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 4034 r->return_icmp) 4035 pf_send_icmp(m, r->return_icmp >> 8, 4036 r->return_icmp & 255, af, r); 4037 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 4038 r->return_icmp6) 4039 pf_send_icmp(m, r->return_icmp6 >> 8, 4040 r->return_icmp6 & 255, af, r); 4041 } 4042 4043 if (r->action == PF_DROP) 4044 goto cleanup; 4045 4046 if (pf_tag_packet(m, tag, rtableid)) { 4047 REASON_SET(&reason, PFRES_MEMORY); 4048 goto cleanup; 4049 } 4050 4051 if (!state_icmp && (r->keep_state || nr != NULL || 4052 (pd->flags & PFDESC_TCP_NORM))) { 4053 int action; 4054 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m, 4055 off, sport, dport, &rewrite, kif, sm, tag, bproto_sum, 4056 bip_sum, hdrlen); 4057 if (action != PF_PASS) 4058 return (action); 4059 } 4060 4061 /* copy back packet headers if we performed NAT operations */ 4062 if (rewrite) 4063 m_copyback(m, off, hdrlen, pd->hdr.any); 4064 4065 return (PF_PASS); 4066 4067 cleanup: 4068 if (sk != NULL) 4069 kfree(sk, M_PFSTATEKEYPL); 4070 if (nk != NULL) 4071 kfree(nk, M_PFSTATEKEYPL); 4072 return (PF_DROP); 4073 } 4074 4075 static __inline int 4076 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 4077 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw, 4078 struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk, 4079 struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite, 4080 struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum, 4081 u_int16_t bip_sum, int hdrlen) 4082 { 4083 struct pf_state *s = NULL; 4084 struct pf_src_node *sn = NULL; 4085 struct tcphdr *th = pd->hdr.tcp; 4086 u_int16_t mss = tcp_mssdflt; 4087 u_short reason; 4088 int cpu = mycpu->gd_cpuid; 4089 4090 /* check maximums */ 4091 if (r->max_states && (r->states_cur >= r->max_states)) { 4092 pf_status.lcounters[LCNT_STATES]++; 4093 REASON_SET(&reason, PFRES_MAXSTATES); 4094 return (PF_DROP); 4095 } 4096 /* src node for filter rule */ 4097 if ((r->rule_flag & PFRULE_SRCTRACK || 4098 r->rpool.opts & PF_POOL_STICKYADDR) && 4099 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 4100 REASON_SET(&reason, PFRES_SRCLIMIT); 4101 goto csfailed; 4102 } 4103 /* src node for translation rule */ 4104 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4105 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 4106 REASON_SET(&reason, PFRES_SRCLIMIT); 4107 goto csfailed; 4108 } 4109 s = kmalloc(sizeof(struct pf_state), M_PFSTATEPL, M_NOWAIT|M_ZERO); 4110 if (s == NULL) { 4111 REASON_SET(&reason, PFRES_MEMORY); 4112 goto csfailed; 4113 } 4114 lockinit(&s->lk, "pfstlk", 0, 0); 4115 s->id = 0; /* XXX Do we really need that? not in OpenBSD */ 4116 s->creatorid = 0; 4117 s->rule.ptr = r; 4118 s->nat_rule.ptr = nr; 4119 s->anchor.ptr = a; 4120 s->state_flags = PFSTATE_CREATEINPROG; 4121 STATE_INC_COUNTERS(s); 4122 if (r->allow_opts) 4123 s->state_flags |= PFSTATE_ALLOWOPTS; 4124 if (r->rule_flag & PFRULE_STATESLOPPY) 4125 s->state_flags |= PFSTATE_SLOPPY; 4126 if (pd->not_cpu_localized) 4127 s->state_flags |= PFSTATE_STACK_GLOBAL; 4128 4129 s->log = r->log & PF_LOG_ALL; 4130 if (nr != NULL) 4131 s->log |= nr->log & PF_LOG_ALL; 4132 switch (pd->proto) { 4133 case IPPROTO_TCP: 4134 s->src.seqlo = ntohl(th->th_seq); 4135 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 4136 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 4137 r->keep_state == PF_STATE_MODULATE) { 4138 /* Generate sequence number modulator */ 4139 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 4140 0) 4141 s->src.seqdiff = 1; 4142 pf_change_a(&th->th_seq, &th->th_sum, 4143 htonl(s->src.seqlo + s->src.seqdiff), 0); 4144 *rewrite = 1; 4145 } else 4146 s->src.seqdiff = 0; 4147 if (th->th_flags & TH_SYN) { 4148 s->src.seqhi++; 4149 s->src.wscale = pf_get_wscale(m, off, 4150 th->th_off, pd->af); 4151 } 4152 s->src.max_win = MAX(ntohs(th->th_win), 1); 4153 if (s->src.wscale & PF_WSCALE_MASK) { 4154 /* Remove scale factor from initial window */ 4155 int win = s->src.max_win; 4156 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 4157 s->src.max_win = (win - 1) >> 4158 (s->src.wscale & PF_WSCALE_MASK); 4159 } 4160 if (th->th_flags & TH_FIN) 4161 s->src.seqhi++; 4162 s->dst.seqhi = 1; 4163 s->dst.max_win = 1; 4164 s->src.state = TCPS_SYN_SENT; 4165 s->dst.state = TCPS_CLOSED; 4166 s->timeout = PFTM_TCP_FIRST_PACKET; 4167 break; 4168 case IPPROTO_UDP: 4169 s->src.state = PFUDPS_SINGLE; 4170 s->dst.state = PFUDPS_NO_TRAFFIC; 4171 s->timeout = PFTM_UDP_FIRST_PACKET; 4172 break; 4173 case IPPROTO_ICMP: 4174 #ifdef INET6 4175 case IPPROTO_ICMPV6: 4176 #endif 4177 s->timeout = PFTM_ICMP_FIRST_PACKET; 4178 break; 4179 default: 4180 s->src.state = PFOTHERS_SINGLE; 4181 s->dst.state = PFOTHERS_NO_TRAFFIC; 4182 s->timeout = PFTM_OTHER_FIRST_PACKET; 4183 } 4184 4185 s->creation = time_second; 4186 s->expire = time_second; 4187 4188 if (sn != NULL) { 4189 s->src_node = sn; 4190 s->src_node->states++; 4191 } 4192 if (nsn != NULL) { 4193 /* XXX We only modify one side for now. */ 4194 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 4195 s->nat_src_node = nsn; 4196 s->nat_src_node->states++; 4197 } 4198 if (pd->proto == IPPROTO_TCP) { 4199 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 4200 off, pd, th, &s->src, &s->dst)) { 4201 REASON_SET(&reason, PFRES_MEMORY); 4202 pf_src_tree_remove_state(s); 4203 STATE_DEC_COUNTERS(s); 4204 kfree(s, M_PFSTATEPL); 4205 return (PF_DROP); 4206 } 4207 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 4208 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 4209 &s->src, &s->dst, rewrite)) { 4210 /* This really shouldn't happen!!! */ 4211 DPFPRINTF(PF_DEBUG_URGENT, 4212 ("pf_normalize_tcp_stateful failed on first pkt")); 4213 pf_normalize_tcp_cleanup(s); 4214 pf_src_tree_remove_state(s); 4215 STATE_DEC_COUNTERS(s); 4216 kfree(s, M_PFSTATEPL); 4217 return (PF_DROP); 4218 } 4219 } 4220 s->direction = pd->dir; 4221 4222 if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk, 4223 pd->src, pd->dst, sport, dport)) { 4224 REASON_SET(&reason, PFRES_MEMORY); 4225 goto csfailed; 4226 } 4227 4228 if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) { 4229 if (pd->proto == IPPROTO_TCP) 4230 pf_normalize_tcp_cleanup(s); 4231 REASON_SET(&reason, PFRES_STATEINS); 4232 pf_src_tree_remove_state(s); 4233 STATE_DEC_COUNTERS(s); 4234 kfree(s, M_PFSTATEPL); 4235 return (PF_DROP); 4236 } else 4237 *sm = s; 4238 4239 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 4240 if (tag > 0) { 4241 pf_tag_ref(tag); 4242 s->tag = tag; 4243 } 4244 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 4245 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 4246 s->src.state = PF_TCPS_PROXY_SRC; 4247 /* undo NAT changes, if they have taken place */ 4248 if (nr != NULL) { 4249 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 4250 if (pd->dir == PF_OUT) 4251 skt = s->key[PF_SK_STACK]; 4252 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 4253 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 4254 if (pd->sport) 4255 *pd->sport = skt->port[pd->sidx]; 4256 if (pd->dport) 4257 *pd->dport = skt->port[pd->didx]; 4258 if (pd->proto_sum) 4259 *pd->proto_sum = bproto_sum; 4260 if (pd->ip_sum) 4261 *pd->ip_sum = bip_sum; 4262 m->m_flags &= ~M_HASH; 4263 m_copyback(m, off, hdrlen, pd->hdr.any); 4264 } 4265 s->src.seqhi = htonl(karc4random()); 4266 /* Find mss option */ 4267 mss = pf_get_mss(m, off, th->th_off, pd->af); 4268 mss = pf_calc_mss(pd->src, pd->af, mss); 4269 mss = pf_calc_mss(pd->dst, pd->af, mss); 4270 s->src.mss = mss; 4271 s->state_flags &= ~PFSTATE_CREATEINPROG; 4272 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 4273 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 4274 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 4275 REASON_SET(&reason, PFRES_SYNPROXY); 4276 return (PF_SYNPROXY_DROP); 4277 } 4278 4279 s->state_flags &= ~PFSTATE_CREATEINPROG; 4280 return (PF_PASS); 4281 4282 csfailed: 4283 if (sk != NULL) 4284 kfree(sk, M_PFSTATEKEYPL); 4285 if (nk != NULL) 4286 kfree(nk, M_PFSTATEKEYPL); 4287 4288 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4289 RB_REMOVE(pf_src_tree, &tree_src_tracking[cpu], sn); 4290 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4291 atomic_add_int(&pf_status.src_nodes, -1); 4292 kfree(sn, M_PFSRCTREEPL); 4293 } 4294 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 4295 RB_REMOVE(pf_src_tree, &tree_src_tracking[cpu], nsn); 4296 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4297 atomic_add_int(&pf_status.src_nodes, -1); 4298 kfree(nsn, M_PFSRCTREEPL); 4299 } 4300 if (s) { 4301 pf_src_tree_remove_state(s); 4302 STATE_DEC_COUNTERS(s); 4303 kfree(s, M_PFSTATEPL); 4304 } 4305 4306 return (PF_DROP); 4307 } 4308 4309 int 4310 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4311 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4312 struct pf_ruleset **rsm) 4313 { 4314 struct pf_rule *r, *a = NULL; 4315 struct pf_ruleset *ruleset = NULL; 4316 sa_family_t af = pd->af; 4317 u_short reason; 4318 int tag = -1; 4319 int asd = 0; 4320 int match = 0; 4321 4322 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4323 while (r != NULL) { 4324 r->evaluations++; 4325 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4326 r = r->skip[PF_SKIP_IFP].ptr; 4327 else if (r->direction && r->direction != direction) 4328 r = r->skip[PF_SKIP_DIR].ptr; 4329 else if (r->af && r->af != af) 4330 r = r->skip[PF_SKIP_AF].ptr; 4331 else if (r->proto && r->proto != pd->proto) 4332 r = r->skip[PF_SKIP_PROTO].ptr; 4333 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4334 r->src.neg, kif)) 4335 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4336 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4337 r->dst.neg, NULL)) 4338 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4339 else if (r->tos && !(r->tos == pd->tos)) 4340 r = TAILQ_NEXT(r, entries); 4341 else if (r->os_fingerprint != PF_OSFP_ANY) 4342 r = TAILQ_NEXT(r, entries); 4343 else if (pd->proto == IPPROTO_UDP && 4344 (r->src.port_op || r->dst.port_op)) 4345 r = TAILQ_NEXT(r, entries); 4346 else if (pd->proto == IPPROTO_TCP && 4347 (r->src.port_op || r->dst.port_op || r->flagset)) 4348 r = TAILQ_NEXT(r, entries); 4349 else if ((pd->proto == IPPROTO_ICMP || 4350 pd->proto == IPPROTO_ICMPV6) && 4351 (r->type || r->code)) 4352 r = TAILQ_NEXT(r, entries); 4353 else if (r->prob && r->prob <= karc4random()) 4354 r = TAILQ_NEXT(r, entries); 4355 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 4356 r = TAILQ_NEXT(r, entries); 4357 else { 4358 if (r->anchor == NULL) { 4359 match = 1; 4360 *rm = r; 4361 *am = a; 4362 *rsm = ruleset; 4363 if ((*rm)->quick) 4364 break; 4365 r = TAILQ_NEXT(r, entries); 4366 } else 4367 pf_step_into_anchor(&asd, &ruleset, 4368 PF_RULESET_FILTER, &r, &a, &match); 4369 } 4370 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4371 PF_RULESET_FILTER, &r, &a, &match)) 4372 break; 4373 } 4374 r = *rm; 4375 a = *am; 4376 ruleset = *rsm; 4377 4378 REASON_SET(&reason, PFRES_MATCH); 4379 4380 if (r->log) 4381 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 4382 pd); 4383 4384 if (r->action != PF_PASS) 4385 return (PF_DROP); 4386 4387 if (pf_tag_packet(m, tag, -1)) { 4388 REASON_SET(&reason, PFRES_MEMORY); 4389 return (PF_DROP); 4390 } 4391 4392 return (PF_PASS); 4393 } 4394 4395 /* 4396 * Called with state locked 4397 */ 4398 int 4399 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 4400 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 4401 struct pf_pdesc *pd, u_short *reason, int *copyback) 4402 { 4403 struct tcphdr *th = pd->hdr.tcp; 4404 u_int16_t win = ntohs(th->th_win); 4405 u_int32_t ack, end, seq, orig_seq; 4406 u_int8_t sws, dws; 4407 int ackskew; 4408 4409 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4410 sws = src->wscale & PF_WSCALE_MASK; 4411 dws = dst->wscale & PF_WSCALE_MASK; 4412 } else { 4413 sws = dws = 0; 4414 } 4415 4416 /* 4417 * Sequence tracking algorithm from Guido van Rooij's paper: 4418 * http://www.madison-gurkha.com/publications/tcp_filtering/ 4419 * tcp_filtering.ps 4420 */ 4421 4422 orig_seq = seq = ntohl(th->th_seq); 4423 if (src->seqlo == 0) { 4424 /* First packet from this end. Set its state */ 4425 4426 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4427 src->scrub == NULL) { 4428 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4429 REASON_SET(reason, PFRES_MEMORY); 4430 return (PF_DROP); 4431 } 4432 } 4433 4434 /* Deferred generation of sequence number modulator */ 4435 if (dst->seqdiff && !src->seqdiff) { 4436 /* use random iss for the TCP server */ 4437 while ((src->seqdiff = karc4random() - seq) == 0) 4438 ; 4439 ack = ntohl(th->th_ack) - dst->seqdiff; 4440 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4441 src->seqdiff), 0); 4442 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4443 *copyback = 1; 4444 } else { 4445 ack = ntohl(th->th_ack); 4446 } 4447 4448 end = seq + pd->p_len; 4449 if (th->th_flags & TH_SYN) { 4450 end++; 4451 (*state)->sync_flags |= PFSTATE_GOT_SYN2; 4452 if (dst->wscale & PF_WSCALE_FLAG) { 4453 src->wscale = pf_get_wscale(m, off, th->th_off, 4454 pd->af); 4455 if (src->wscale & PF_WSCALE_FLAG) { 4456 /* Remove scale factor from initial 4457 * window */ 4458 sws = src->wscale & PF_WSCALE_MASK; 4459 win = ((u_int32_t)win + (1 << sws) - 1) 4460 >> sws; 4461 dws = dst->wscale & PF_WSCALE_MASK; 4462 } else { 4463 /* fixup other window */ 4464 dst->max_win <<= dst->wscale & 4465 PF_WSCALE_MASK; 4466 /* in case of a retrans SYN|ACK */ 4467 dst->wscale = 0; 4468 } 4469 } 4470 } 4471 if (th->th_flags & TH_FIN) 4472 end++; 4473 4474 src->seqlo = seq; 4475 if (src->state < TCPS_SYN_SENT) 4476 src->state = TCPS_SYN_SENT; 4477 4478 /* 4479 * May need to slide the window (seqhi may have been set by 4480 * the crappy stack check or if we picked up the connection 4481 * after establishment) 4482 */ 4483 if (src->seqhi == 1 || 4484 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4485 src->seqhi = end + MAX(1, dst->max_win << dws); 4486 if (win > src->max_win) 4487 src->max_win = win; 4488 4489 } else { 4490 ack = ntohl(th->th_ack) - dst->seqdiff; 4491 if (src->seqdiff) { 4492 /* Modulate sequence numbers */ 4493 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4494 src->seqdiff), 0); 4495 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4496 *copyback = 1; 4497 } 4498 end = seq + pd->p_len; 4499 if (th->th_flags & TH_SYN) 4500 end++; 4501 if (th->th_flags & TH_FIN) 4502 end++; 4503 } 4504 4505 if ((th->th_flags & TH_ACK) == 0) { 4506 /* Let it pass through the ack skew check */ 4507 ack = dst->seqlo; 4508 } else if ((ack == 0 && 4509 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4510 /* broken tcp stacks do not set ack */ 4511 (dst->state < TCPS_SYN_SENT)) { 4512 /* 4513 * Many stacks (ours included) will set the ACK number in an 4514 * FIN|ACK if the SYN times out -- no sequence to ACK. 4515 */ 4516 ack = dst->seqlo; 4517 } 4518 4519 if (seq == end) { 4520 /* Ease sequencing restrictions on no data packets */ 4521 seq = src->seqlo; 4522 end = seq; 4523 } 4524 4525 ackskew = dst->seqlo - ack; 4526 4527 4528 /* 4529 * Need to demodulate the sequence numbers in any TCP SACK options 4530 * (Selective ACK). We could optionally validate the SACK values 4531 * against the current ACK window, either forwards or backwards, but 4532 * I'm not confident that SACK has been implemented properly 4533 * everywhere. It wouldn't surprise me if several stacks accidently 4534 * SACK too far backwards of previously ACKed data. There really aren't 4535 * any security implications of bad SACKing unless the target stack 4536 * doesn't validate the option length correctly. Someone trying to 4537 * spoof into a TCP connection won't bother blindly sending SACK 4538 * options anyway. 4539 */ 4540 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4541 if (pf_modulate_sack(m, off, pd, th, dst)) 4542 *copyback = 1; 4543 } 4544 4545 4546 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4547 if (SEQ_GEQ(src->seqhi, end) && 4548 /* Last octet inside other's window space */ 4549 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4550 /* Retrans: not more than one window back */ 4551 (ackskew >= -MAXACKWINDOW) && 4552 /* Acking not more than one reassembled fragment backwards */ 4553 (ackskew <= (MAXACKWINDOW << sws)) && 4554 /* Acking not more than one window forward */ 4555 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4556 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4557 (pd->flags & PFDESC_IP_REAS) == 0)) { 4558 /* Require an exact/+1 sequence match on resets when possible */ 4559 4560 if (dst->scrub || src->scrub) { 4561 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4562 *state, src, dst, copyback)) 4563 return (PF_DROP); 4564 } 4565 4566 /* update max window */ 4567 if (src->max_win < win) 4568 src->max_win = win; 4569 /* synchronize sequencing */ 4570 if (SEQ_GT(end, src->seqlo)) 4571 src->seqlo = end; 4572 /* slide the window of what the other end can send */ 4573 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4574 dst->seqhi = ack + MAX((win << sws), 1); 4575 4576 4577 /* update states */ 4578 if (th->th_flags & TH_SYN) 4579 if (src->state < TCPS_SYN_SENT) 4580 src->state = TCPS_SYN_SENT; 4581 if (th->th_flags & TH_FIN) 4582 if (src->state < TCPS_CLOSING) 4583 src->state = TCPS_CLOSING; 4584 if (th->th_flags & TH_ACK) { 4585 if (dst->state == TCPS_SYN_SENT) { 4586 dst->state = TCPS_ESTABLISHED; 4587 if (src->state == TCPS_ESTABLISHED && 4588 (*state)->src_node != NULL && 4589 pf_src_connlimit(*state)) { 4590 REASON_SET(reason, PFRES_SRCLIMIT); 4591 return (PF_DROP); 4592 } 4593 } else if (dst->state == TCPS_CLOSING) 4594 dst->state = TCPS_FIN_WAIT_2; 4595 } 4596 if (th->th_flags & TH_RST) 4597 src->state = dst->state = TCPS_TIME_WAIT; 4598 4599 /* update expire time */ 4600 (*state)->expire = time_second; 4601 if (src->state >= TCPS_FIN_WAIT_2 && 4602 dst->state >= TCPS_FIN_WAIT_2) 4603 (*state)->timeout = PFTM_TCP_CLOSED; 4604 else if (src->state >= TCPS_CLOSING && 4605 dst->state >= TCPS_CLOSING) 4606 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4607 else if (src->state < TCPS_ESTABLISHED || 4608 dst->state < TCPS_ESTABLISHED) 4609 (*state)->timeout = PFTM_TCP_OPENING; 4610 else if (src->state >= TCPS_CLOSING || 4611 dst->state >= TCPS_CLOSING) 4612 (*state)->timeout = PFTM_TCP_CLOSING; 4613 else 4614 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4615 4616 /* Fall through to PASS packet */ 4617 4618 } else if ((dst->state < TCPS_SYN_SENT || 4619 dst->state >= TCPS_FIN_WAIT_2 || 4620 src->state >= TCPS_FIN_WAIT_2) && 4621 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4622 /* Within a window forward of the originating packet */ 4623 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4624 /* Within a window backward of the originating packet */ 4625 4626 /* 4627 * This currently handles three situations: 4628 * 1) Stupid stacks will shotgun SYNs before their peer 4629 * replies. 4630 * 2) When PF catches an already established stream (the 4631 * firewall rebooted, the state table was flushed, routes 4632 * changed...) 4633 * 3) Packets get funky immediately after the connection 4634 * closes (this should catch Solaris spurious ACK|FINs 4635 * that web servers like to spew after a close) 4636 * 4637 * This must be a little more careful than the above code 4638 * since packet floods will also be caught here. We don't 4639 * update the TTL here to mitigate the damage of a packet 4640 * flood and so the same code can handle awkward establishment 4641 * and a loosened connection close. 4642 * In the establishment case, a correct peer response will 4643 * validate the connection, go through the normal state code 4644 * and keep updating the state TTL. 4645 */ 4646 4647 if (pf_status.debug >= PF_DEBUG_MISC) { 4648 kprintf("pf: loose state match: "); 4649 pf_print_state(*state); 4650 pf_print_flags(th->th_flags); 4651 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4652 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len, 4653 ackskew, (unsigned long long)(*state)->packets[0], 4654 (unsigned long long)(*state)->packets[1], 4655 pd->dir == PF_IN ? "in" : "out", 4656 pd->dir == (*state)->direction ? "fwd" : "rev"); 4657 } 4658 4659 if (dst->scrub || src->scrub) { 4660 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4661 *state, src, dst, copyback)) 4662 return (PF_DROP); 4663 } 4664 4665 /* update max window */ 4666 if (src->max_win < win) 4667 src->max_win = win; 4668 /* synchronize sequencing */ 4669 if (SEQ_GT(end, src->seqlo)) 4670 src->seqlo = end; 4671 /* slide the window of what the other end can send */ 4672 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4673 dst->seqhi = ack + MAX((win << sws), 1); 4674 4675 /* 4676 * Cannot set dst->seqhi here since this could be a shotgunned 4677 * SYN and not an already established connection. 4678 */ 4679 4680 if (th->th_flags & TH_FIN) 4681 if (src->state < TCPS_CLOSING) 4682 src->state = TCPS_CLOSING; 4683 if (th->th_flags & TH_RST) 4684 src->state = dst->state = TCPS_TIME_WAIT; 4685 4686 /* Fall through to PASS packet */ 4687 4688 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY || 4689 ((*state)->pickup_mode == PF_PICKUPS_ENABLED && 4690 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) != 4691 PFSTATE_GOT_SYN_MASK)) { 4692 /* 4693 * If pickup mode is hash only, do not fail on sequence checks. 4694 * 4695 * If pickup mode is enabled and we did not see the SYN in 4696 * both direction, do not fail on sequence checks because 4697 * we do not have complete information on window scale. 4698 * 4699 * Adjust expiration and fall through to PASS packet. 4700 * XXX Add a FIN check to reduce timeout? 4701 */ 4702 (*state)->expire = time_second; 4703 } else { 4704 /* 4705 * Failure processing 4706 */ 4707 if ((*state)->dst.state == TCPS_SYN_SENT && 4708 (*state)->src.state == TCPS_SYN_SENT) { 4709 /* Send RST for state mismatches during handshake */ 4710 if (!(th->th_flags & TH_RST)) 4711 pf_send_tcp((*state)->rule.ptr, pd->af, 4712 pd->dst, pd->src, th->th_dport, 4713 th->th_sport, ntohl(th->th_ack), 0, 4714 TH_RST, 0, 0, 4715 (*state)->rule.ptr->return_ttl, 1, 0, 4716 pd->eh, kif->pfik_ifp); 4717 src->seqlo = 0; 4718 src->seqhi = 1; 4719 src->max_win = 1; 4720 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4721 kprintf("pf: BAD state: "); 4722 pf_print_state(*state); 4723 pf_print_flags(th->th_flags); 4724 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4725 "pkts=%llu:%llu dir=%s,%s\n", 4726 seq, orig_seq, ack, pd->p_len, ackskew, 4727 (unsigned long long)(*state)->packets[0], 4728 (unsigned long long)(*state)->packets[1], 4729 pd->dir == PF_IN ? "in" : "out", 4730 pd->dir == (*state)->direction ? "fwd" : "rev"); 4731 kprintf("pf: State failure on: %c %c %c %c | %c %c\n", 4732 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4733 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4734 ' ': '2', 4735 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4736 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4737 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4738 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4739 } 4740 REASON_SET(reason, PFRES_BADSTATE); 4741 return (PF_DROP); 4742 } 4743 4744 return (PF_PASS); 4745 } 4746 4747 /* 4748 * Called with state locked 4749 */ 4750 int 4751 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4752 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4753 { 4754 struct tcphdr *th = pd->hdr.tcp; 4755 4756 if (th->th_flags & TH_SYN) 4757 if (src->state < TCPS_SYN_SENT) 4758 src->state = TCPS_SYN_SENT; 4759 if (th->th_flags & TH_FIN) 4760 if (src->state < TCPS_CLOSING) 4761 src->state = TCPS_CLOSING; 4762 if (th->th_flags & TH_ACK) { 4763 if (dst->state == TCPS_SYN_SENT) { 4764 dst->state = TCPS_ESTABLISHED; 4765 if (src->state == TCPS_ESTABLISHED && 4766 (*state)->src_node != NULL && 4767 pf_src_connlimit(*state)) { 4768 REASON_SET(reason, PFRES_SRCLIMIT); 4769 return (PF_DROP); 4770 } 4771 } else if (dst->state == TCPS_CLOSING) { 4772 dst->state = TCPS_FIN_WAIT_2; 4773 } else if (src->state == TCPS_SYN_SENT && 4774 dst->state < TCPS_SYN_SENT) { 4775 /* 4776 * Handle a special sloppy case where we only see one 4777 * half of the connection. If there is a ACK after 4778 * the initial SYN without ever seeing a packet from 4779 * the destination, set the connection to established. 4780 */ 4781 dst->state = src->state = TCPS_ESTABLISHED; 4782 if ((*state)->src_node != NULL && 4783 pf_src_connlimit(*state)) { 4784 REASON_SET(reason, PFRES_SRCLIMIT); 4785 return (PF_DROP); 4786 } 4787 } else if (src->state == TCPS_CLOSING && 4788 dst->state == TCPS_ESTABLISHED && 4789 dst->seqlo == 0) { 4790 /* 4791 * Handle the closing of half connections where we 4792 * don't see the full bidirectional FIN/ACK+ACK 4793 * handshake. 4794 */ 4795 dst->state = TCPS_CLOSING; 4796 } 4797 } 4798 if (th->th_flags & TH_RST) 4799 src->state = dst->state = TCPS_TIME_WAIT; 4800 4801 /* update expire time */ 4802 (*state)->expire = time_second; 4803 if (src->state >= TCPS_FIN_WAIT_2 && 4804 dst->state >= TCPS_FIN_WAIT_2) 4805 (*state)->timeout = PFTM_TCP_CLOSED; 4806 else if (src->state >= TCPS_CLOSING && 4807 dst->state >= TCPS_CLOSING) 4808 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4809 else if (src->state < TCPS_ESTABLISHED || 4810 dst->state < TCPS_ESTABLISHED) 4811 (*state)->timeout = PFTM_TCP_OPENING; 4812 else if (src->state >= TCPS_CLOSING || 4813 dst->state >= TCPS_CLOSING) 4814 (*state)->timeout = PFTM_TCP_CLOSING; 4815 else 4816 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4817 4818 return (PF_PASS); 4819 } 4820 4821 /* 4822 * Test TCP connection state. Caller must hold the state locked. 4823 */ 4824 int 4825 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4826 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4827 u_short *reason) 4828 { 4829 struct pf_state_key_cmp key; 4830 struct tcphdr *th = pd->hdr.tcp; 4831 int copyback = 0; 4832 int error; 4833 struct pf_state_peer *src, *dst; 4834 struct pf_state_key *sk; 4835 4836 bzero(&key, sizeof(key)); 4837 key.af = pd->af; 4838 key.proto = IPPROTO_TCP; 4839 if (direction == PF_IN) { /* wire side, straight */ 4840 PF_ACPY(&key.addr[0], pd->src, key.af); 4841 PF_ACPY(&key.addr[1], pd->dst, key.af); 4842 key.port[0] = th->th_sport; 4843 key.port[1] = th->th_dport; 4844 if (pf_status.debug >= PF_DEBUG_MISC) { 4845 kprintf("test-tcp IN (%08x:%d) -> (%08x:%d)\n", 4846 ntohl(key.addr[0].addr32[0]), 4847 ntohs(key.port[0]), 4848 ntohl(key.addr[1].addr32[0]), 4849 ntohs(key.port[1])); 4850 } 4851 } else { /* stack side, reverse */ 4852 PF_ACPY(&key.addr[1], pd->src, key.af); 4853 PF_ACPY(&key.addr[0], pd->dst, key.af); 4854 key.port[1] = th->th_sport; 4855 key.port[0] = th->th_dport; 4856 if (pf_status.debug >= PF_DEBUG_MISC) { 4857 kprintf("test-tcp OUT (%08x:%d) <- (%08x:%d)\n", 4858 ntohl(key.addr[0].addr32[0]), 4859 ntohs(key.port[0]), 4860 ntohl(key.addr[1].addr32[0]), 4861 ntohs(key.port[1])); 4862 } 4863 } 4864 4865 STATE_LOOKUP(kif, &key, direction, *state, m); 4866 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 4867 4868 if (direction == (*state)->direction) { 4869 src = &(*state)->src; 4870 dst = &(*state)->dst; 4871 } else { 4872 src = &(*state)->dst; 4873 dst = &(*state)->src; 4874 } 4875 4876 sk = (*state)->key[pd->didx]; 4877 4878 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4879 if (direction != (*state)->direction) { 4880 REASON_SET(reason, PFRES_SYNPROXY); 4881 FAIL (PF_SYNPROXY_DROP); 4882 } 4883 if (th->th_flags & TH_SYN) { 4884 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4885 REASON_SET(reason, PFRES_SYNPROXY); 4886 FAIL (PF_DROP); 4887 } 4888 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4889 pd->src, th->th_dport, th->th_sport, 4890 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4891 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4892 0, NULL, NULL); 4893 REASON_SET(reason, PFRES_SYNPROXY); 4894 FAIL (PF_SYNPROXY_DROP); 4895 } else if (!(th->th_flags & TH_ACK) || 4896 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4897 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4898 REASON_SET(reason, PFRES_SYNPROXY); 4899 FAIL (PF_DROP); 4900 } else if ((*state)->src_node != NULL && 4901 pf_src_connlimit(*state)) { 4902 REASON_SET(reason, PFRES_SRCLIMIT); 4903 FAIL (PF_DROP); 4904 } else 4905 (*state)->src.state = PF_TCPS_PROXY_DST; 4906 } 4907 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4908 if (direction == (*state)->direction) { 4909 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4910 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4911 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4912 REASON_SET(reason, PFRES_SYNPROXY); 4913 FAIL (PF_DROP); 4914 } 4915 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4916 if ((*state)->dst.seqhi == 1) 4917 (*state)->dst.seqhi = htonl(karc4random()); 4918 pf_send_tcp((*state)->rule.ptr, pd->af, 4919 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4920 sk->port[pd->sidx], sk->port[pd->didx], 4921 (*state)->dst.seqhi, 0, TH_SYN, 0, 4922 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4923 REASON_SET(reason, PFRES_SYNPROXY); 4924 FAIL (PF_SYNPROXY_DROP); 4925 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4926 (TH_SYN|TH_ACK)) || 4927 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4928 REASON_SET(reason, PFRES_SYNPROXY); 4929 FAIL (PF_DROP); 4930 } else { 4931 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4932 (*state)->dst.seqlo = ntohl(th->th_seq); 4933 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4934 pd->src, th->th_dport, th->th_sport, 4935 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4936 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4937 (*state)->tag, NULL, NULL); 4938 pf_send_tcp((*state)->rule.ptr, pd->af, 4939 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4940 sk->port[pd->sidx], sk->port[pd->didx], 4941 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4942 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4943 0, NULL, NULL); 4944 (*state)->src.seqdiff = (*state)->dst.seqhi - 4945 (*state)->src.seqlo; 4946 (*state)->dst.seqdiff = (*state)->src.seqhi - 4947 (*state)->dst.seqlo; 4948 (*state)->src.seqhi = (*state)->src.seqlo + 4949 (*state)->dst.max_win; 4950 (*state)->dst.seqhi = (*state)->dst.seqlo + 4951 (*state)->src.max_win; 4952 (*state)->src.wscale = (*state)->dst.wscale = 0; 4953 (*state)->src.state = (*state)->dst.state = 4954 TCPS_ESTABLISHED; 4955 REASON_SET(reason, PFRES_SYNPROXY); 4956 FAIL (PF_SYNPROXY_DROP); 4957 } 4958 } 4959 4960 /* 4961 * Check for connection (addr+port pair) reuse. We can't actually 4962 * unlink the state if we don't own it. 4963 */ 4964 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4965 dst->state >= TCPS_FIN_WAIT_2 && 4966 src->state >= TCPS_FIN_WAIT_2) { 4967 if (pf_status.debug >= PF_DEBUG_MISC) { 4968 kprintf("pf: state reuse "); 4969 pf_print_state(*state); 4970 pf_print_flags(th->th_flags); 4971 kprintf("\n"); 4972 } 4973 /* XXX make sure it's the same direction ?? */ 4974 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4975 if ((*state)->cpuid == mycpu->gd_cpuid) { 4976 pf_unlink_state(*state); 4977 *state = NULL; 4978 } else { 4979 (*state)->timeout = PFTM_PURGE; 4980 } 4981 FAIL (PF_DROP); 4982 } 4983 4984 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4985 if (pf_tcp_track_sloppy(src, dst, state, pd, 4986 reason) == PF_DROP) { 4987 FAIL (PF_DROP); 4988 } 4989 } else { 4990 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, 4991 reason, ©back) == PF_DROP) { 4992 FAIL (PF_DROP); 4993 } 4994 } 4995 4996 /* translate source/destination address, if necessary */ 4997 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4998 struct pf_state_key *nk = (*state)->key[pd->didx]; 4999 5000 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5001 nk->port[pd->sidx] != th->th_sport) { 5002 /* 5003 * The translated source address may be completely 5004 * unrelated to the saved link header, make sure 5005 * a bridge doesn't try to use it. 5006 */ 5007 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 5008 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 5009 &th->th_sum, &nk->addr[pd->sidx], 5010 nk->port[pd->sidx], 0, pd->af); 5011 } 5012 5013 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5014 nk->port[pd->didx] != th->th_dport) { 5015 /* 5016 * If we don't redispatch the packet will go into 5017 * the protocol stack on the wrong cpu for the 5018 * post-translated address. 5019 */ 5020 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 5021 &th->th_sum, &nk->addr[pd->didx], 5022 nk->port[pd->didx], 0, pd->af); 5023 } 5024 copyback = 1; 5025 } 5026 5027 /* Copyback sequence modulation or stateful scrub changes if needed */ 5028 if (copyback) { 5029 m->m_flags &= ~M_HASH; 5030 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5031 } 5032 5033 pfsync_update_state(*state); 5034 error = PF_PASS; 5035 done: 5036 if (*state) 5037 lockmgr(&(*state)->lk, LK_RELEASE); 5038 return (error); 5039 } 5040 5041 /* 5042 * Test UDP connection state. Caller must hold the state locked. 5043 */ 5044 int 5045 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 5046 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5047 { 5048 struct pf_state_peer *src, *dst; 5049 struct pf_state_key_cmp key; 5050 struct udphdr *uh = pd->hdr.udp; 5051 5052 bzero(&key, sizeof(key)); 5053 key.af = pd->af; 5054 key.proto = IPPROTO_UDP; 5055 if (direction == PF_IN) { /* wire side, straight */ 5056 PF_ACPY(&key.addr[0], pd->src, key.af); 5057 PF_ACPY(&key.addr[1], pd->dst, key.af); 5058 key.port[0] = uh->uh_sport; 5059 key.port[1] = uh->uh_dport; 5060 } else { /* stack side, reverse */ 5061 PF_ACPY(&key.addr[1], pd->src, key.af); 5062 PF_ACPY(&key.addr[0], pd->dst, key.af); 5063 key.port[1] = uh->uh_sport; 5064 key.port[0] = uh->uh_dport; 5065 } 5066 5067 STATE_LOOKUP(kif, &key, direction, *state, m); 5068 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5069 5070 if (direction == (*state)->direction) { 5071 src = &(*state)->src; 5072 dst = &(*state)->dst; 5073 } else { 5074 src = &(*state)->dst; 5075 dst = &(*state)->src; 5076 } 5077 5078 /* update states */ 5079 if (src->state < PFUDPS_SINGLE) 5080 src->state = PFUDPS_SINGLE; 5081 if (dst->state == PFUDPS_SINGLE) 5082 dst->state = PFUDPS_MULTIPLE; 5083 5084 /* update expire time */ 5085 (*state)->expire = time_second; 5086 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5087 (*state)->timeout = PFTM_UDP_MULTIPLE; 5088 else 5089 (*state)->timeout = PFTM_UDP_SINGLE; 5090 5091 /* translate source/destination address, if necessary */ 5092 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5093 struct pf_state_key *nk = (*state)->key[pd->didx]; 5094 5095 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5096 nk->port[pd->sidx] != uh->uh_sport) { 5097 /* 5098 * The translated source address may be completely 5099 * unrelated to the saved link header, make sure 5100 * a bridge doesn't try to use it. 5101 */ 5102 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 5103 m->m_flags &= ~M_HASH; 5104 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 5105 &uh->uh_sum, &nk->addr[pd->sidx], 5106 nk->port[pd->sidx], 1, pd->af); 5107 } 5108 5109 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5110 nk->port[pd->didx] != uh->uh_dport) { 5111 /* 5112 * If we don't redispatch the packet will go into 5113 * the protocol stack on the wrong cpu for the 5114 * post-translated address. 5115 */ 5116 m->m_flags &= ~M_HASH; 5117 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 5118 &uh->uh_sum, &nk->addr[pd->didx], 5119 nk->port[pd->didx], 1, pd->af); 5120 } 5121 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5122 } 5123 5124 pfsync_update_state(*state); 5125 lockmgr(&(*state)->lk, LK_RELEASE); 5126 return (PF_PASS); 5127 } 5128 5129 /* 5130 * Test ICMP connection state. Caller must hold the state locked. 5131 */ 5132 int 5133 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 5134 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 5135 u_short *reason) 5136 { 5137 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 5138 u_int16_t icmpid = 0, *icmpsum = NULL; 5139 u_int8_t icmptype = 0; 5140 int state_icmp = 0; 5141 int error; 5142 struct pf_state_key_cmp key; 5143 5144 bzero(&key, sizeof(key)); 5145 5146 switch (pd->proto) { 5147 #ifdef INET 5148 case IPPROTO_ICMP: 5149 icmptype = pd->hdr.icmp->icmp_type; 5150 icmpid = pd->hdr.icmp->icmp_id; 5151 icmpsum = &pd->hdr.icmp->icmp_cksum; 5152 5153 if (icmptype == ICMP_UNREACH || 5154 icmptype == ICMP_SOURCEQUENCH || 5155 icmptype == ICMP_REDIRECT || 5156 icmptype == ICMP_TIMXCEED || 5157 icmptype == ICMP_PARAMPROB) 5158 state_icmp++; 5159 break; 5160 #endif /* INET */ 5161 #ifdef INET6 5162 case IPPROTO_ICMPV6: 5163 icmptype = pd->hdr.icmp6->icmp6_type; 5164 icmpid = pd->hdr.icmp6->icmp6_id; 5165 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 5166 5167 if (icmptype == ICMP6_DST_UNREACH || 5168 icmptype == ICMP6_PACKET_TOO_BIG || 5169 icmptype == ICMP6_TIME_EXCEEDED || 5170 icmptype == ICMP6_PARAM_PROB) 5171 state_icmp++; 5172 break; 5173 #endif /* INET6 */ 5174 } 5175 5176 if (!state_icmp) { 5177 5178 /* 5179 * ICMP query/reply message not related to a TCP/UDP packet. 5180 * Search for an ICMP state. 5181 */ 5182 key.af = pd->af; 5183 key.proto = pd->proto; 5184 key.port[0] = key.port[1] = icmpid; 5185 if (direction == PF_IN) { /* wire side, straight */ 5186 PF_ACPY(&key.addr[0], pd->src, key.af); 5187 PF_ACPY(&key.addr[1], pd->dst, key.af); 5188 } else { /* stack side, reverse */ 5189 PF_ACPY(&key.addr[1], pd->src, key.af); 5190 PF_ACPY(&key.addr[0], pd->dst, key.af); 5191 } 5192 5193 STATE_LOOKUP(kif, &key, direction, *state, m); 5194 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5195 5196 (*state)->expire = time_second; 5197 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 5198 5199 /* translate source/destination address, if necessary */ 5200 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5201 struct pf_state_key *nk = (*state)->key[pd->didx]; 5202 5203 switch (pd->af) { 5204 #ifdef INET 5205 case AF_INET: 5206 if (PF_ANEQ(pd->src, 5207 &nk->addr[pd->sidx], AF_INET)) 5208 pf_change_a(&saddr->v4.s_addr, 5209 pd->ip_sum, 5210 nk->addr[pd->sidx].v4.s_addr, 0); 5211 5212 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 5213 AF_INET)) 5214 pf_change_a(&daddr->v4.s_addr, 5215 pd->ip_sum, 5216 nk->addr[pd->didx].v4.s_addr, 0); 5217 5218 if (nk->port[0] != 5219 pd->hdr.icmp->icmp_id) { 5220 pd->hdr.icmp->icmp_cksum = 5221 pf_cksum_fixup( 5222 pd->hdr.icmp->icmp_cksum, icmpid, 5223 nk->port[pd->sidx], 0); 5224 pd->hdr.icmp->icmp_id = 5225 nk->port[pd->sidx]; 5226 } 5227 5228 m->m_flags &= ~M_HASH; 5229 m_copyback(m, off, ICMP_MINLEN, 5230 (caddr_t)pd->hdr.icmp); 5231 break; 5232 #endif /* INET */ 5233 #ifdef INET6 5234 case AF_INET6: 5235 if (PF_ANEQ(pd->src, 5236 &nk->addr[pd->sidx], AF_INET6)) 5237 pf_change_a6(saddr, 5238 &pd->hdr.icmp6->icmp6_cksum, 5239 &nk->addr[pd->sidx], 0); 5240 5241 if (PF_ANEQ(pd->dst, 5242 &nk->addr[pd->didx], AF_INET6)) 5243 pf_change_a6(daddr, 5244 &pd->hdr.icmp6->icmp6_cksum, 5245 &nk->addr[pd->didx], 0); 5246 5247 m->m_flags &= ~M_HASH; 5248 m_copyback(m, off, 5249 sizeof(struct icmp6_hdr), 5250 (caddr_t)pd->hdr.icmp6); 5251 break; 5252 #endif /* INET6 */ 5253 } 5254 } 5255 } else { 5256 /* 5257 * ICMP error message in response to a TCP/UDP packet. 5258 * Extract the inner TCP/UDP header and search for that state. 5259 */ 5260 5261 struct pf_pdesc pd2; 5262 #ifdef INET 5263 struct ip h2; 5264 #endif /* INET */ 5265 #ifdef INET6 5266 struct ip6_hdr h2_6; 5267 int terminal = 0; 5268 #endif /* INET6 */ 5269 int ipoff2; 5270 int off2; 5271 5272 pd2.not_cpu_localized = 1; 5273 pd2.af = pd->af; 5274 /* Payload packet is from the opposite direction. */ 5275 pd2.sidx = (direction == PF_IN) ? 1 : 0; 5276 pd2.didx = (direction == PF_IN) ? 0 : 1; 5277 switch (pd->af) { 5278 #ifdef INET 5279 case AF_INET: 5280 /* offset of h2 in mbuf chain */ 5281 ipoff2 = off + ICMP_MINLEN; 5282 5283 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5284 NULL, reason, pd2.af)) { 5285 DPFPRINTF(PF_DEBUG_MISC, 5286 ("pf: ICMP error message too short " 5287 "(ip)\n")); 5288 FAIL (PF_DROP); 5289 } 5290 /* 5291 * ICMP error messages don't refer to non-first 5292 * fragments 5293 */ 5294 if (h2.ip_off & htons(IP_OFFMASK)) { 5295 REASON_SET(reason, PFRES_FRAG); 5296 FAIL (PF_DROP); 5297 } 5298 5299 /* offset of protocol header that follows h2 */ 5300 off2 = ipoff2 + (h2.ip_hl << 2); 5301 5302 pd2.proto = h2.ip_p; 5303 pd2.src = (struct pf_addr *)&h2.ip_src; 5304 pd2.dst = (struct pf_addr *)&h2.ip_dst; 5305 pd2.ip_sum = &h2.ip_sum; 5306 break; 5307 #endif /* INET */ 5308 #ifdef INET6 5309 case AF_INET6: 5310 ipoff2 = off + sizeof(struct icmp6_hdr); 5311 5312 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5313 NULL, reason, pd2.af)) { 5314 DPFPRINTF(PF_DEBUG_MISC, 5315 ("pf: ICMP error message too short " 5316 "(ip6)\n")); 5317 FAIL (PF_DROP); 5318 } 5319 pd2.proto = h2_6.ip6_nxt; 5320 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5321 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5322 pd2.ip_sum = NULL; 5323 off2 = ipoff2 + sizeof(h2_6); 5324 do { 5325 switch (pd2.proto) { 5326 case IPPROTO_FRAGMENT: 5327 /* 5328 * ICMPv6 error messages for 5329 * non-first fragments 5330 */ 5331 REASON_SET(reason, PFRES_FRAG); 5332 FAIL (PF_DROP); 5333 case IPPROTO_AH: 5334 case IPPROTO_HOPOPTS: 5335 case IPPROTO_ROUTING: 5336 case IPPROTO_DSTOPTS: { 5337 /* get next header and header length */ 5338 struct ip6_ext opt6; 5339 5340 if (!pf_pull_hdr(m, off2, &opt6, 5341 sizeof(opt6), NULL, reason, 5342 pd2.af)) { 5343 DPFPRINTF(PF_DEBUG_MISC, 5344 ("pf: ICMPv6 short opt\n")); 5345 FAIL (PF_DROP); 5346 } 5347 if (pd2.proto == IPPROTO_AH) 5348 off2 += (opt6.ip6e_len + 2) * 4; 5349 else 5350 off2 += (opt6.ip6e_len + 1) * 8; 5351 pd2.proto = opt6.ip6e_nxt; 5352 /* goto the next header */ 5353 break; 5354 } 5355 default: 5356 terminal++; 5357 break; 5358 } 5359 } while (!terminal); 5360 break; 5361 #endif /* INET6 */ 5362 default: 5363 DPFPRINTF(PF_DEBUG_MISC, 5364 ("pf: ICMP AF %d unknown (ip6)\n", pd->af)); 5365 FAIL (PF_DROP); 5366 break; 5367 } 5368 5369 switch (pd2.proto) { 5370 case IPPROTO_TCP: { 5371 struct tcphdr th; 5372 u_int32_t seq; 5373 struct pf_state_peer *src, *dst; 5374 u_int8_t dws; 5375 int copyback = 0; 5376 5377 /* 5378 * Only the first 8 bytes of the TCP header can be 5379 * expected. Don't access any TCP header fields after 5380 * th_seq, an ackskew test is not possible. 5381 */ 5382 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5383 pd2.af)) { 5384 DPFPRINTF(PF_DEBUG_MISC, 5385 ("pf: ICMP error message too short " 5386 "(tcp)\n")); 5387 FAIL (PF_DROP); 5388 } 5389 5390 key.af = pd2.af; 5391 key.proto = IPPROTO_TCP; 5392 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5393 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5394 key.port[pd2.sidx] = th.th_sport; 5395 key.port[pd2.didx] = th.th_dport; 5396 5397 STATE_LOOKUP(kif, &key, direction, *state, m); 5398 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5399 5400 if (direction == (*state)->direction) { 5401 src = &(*state)->dst; 5402 dst = &(*state)->src; 5403 } else { 5404 src = &(*state)->src; 5405 dst = &(*state)->dst; 5406 } 5407 5408 if (src->wscale && dst->wscale) 5409 dws = dst->wscale & PF_WSCALE_MASK; 5410 else 5411 dws = 0; 5412 5413 /* Demodulate sequence number */ 5414 seq = ntohl(th.th_seq) - src->seqdiff; 5415 if (src->seqdiff) { 5416 pf_change_a(&th.th_seq, icmpsum, 5417 htonl(seq), 0); 5418 copyback = 1; 5419 } 5420 5421 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 5422 (!SEQ_GEQ(src->seqhi, seq) || 5423 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 5424 if (pf_status.debug >= PF_DEBUG_MISC) { 5425 kprintf("pf: BAD ICMP %d:%d ", 5426 icmptype, pd->hdr.icmp->icmp_code); 5427 pf_print_host(pd->src, 0, pd->af); 5428 kprintf(" -> "); 5429 pf_print_host(pd->dst, 0, pd->af); 5430 kprintf(" state: "); 5431 pf_print_state(*state); 5432 kprintf(" seq=%u\n", seq); 5433 } 5434 REASON_SET(reason, PFRES_BADSTATE); 5435 FAIL (PF_DROP); 5436 } else { 5437 if (pf_status.debug >= PF_DEBUG_MISC) { 5438 kprintf("pf: OK ICMP %d:%d ", 5439 icmptype, pd->hdr.icmp->icmp_code); 5440 pf_print_host(pd->src, 0, pd->af); 5441 kprintf(" -> "); 5442 pf_print_host(pd->dst, 0, pd->af); 5443 kprintf(" state: "); 5444 pf_print_state(*state); 5445 kprintf(" seq=%u\n", seq); 5446 } 5447 } 5448 5449 /* translate source/destination address, if necessary */ 5450 if ((*state)->key[PF_SK_WIRE] != 5451 (*state)->key[PF_SK_STACK]) { 5452 struct pf_state_key *nk = 5453 (*state)->key[pd->didx]; 5454 5455 if (PF_ANEQ(pd2.src, 5456 &nk->addr[pd2.sidx], pd2.af) || 5457 nk->port[pd2.sidx] != th.th_sport) 5458 pf_change_icmp(pd2.src, &th.th_sport, 5459 daddr, &nk->addr[pd2.sidx], 5460 nk->port[pd2.sidx], NULL, 5461 pd2.ip_sum, icmpsum, 5462 pd->ip_sum, 0, pd2.af); 5463 5464 if (PF_ANEQ(pd2.dst, 5465 &nk->addr[pd2.didx], pd2.af) || 5466 nk->port[pd2.didx] != th.th_dport) 5467 pf_change_icmp(pd2.dst, &th.th_dport, 5468 NULL, /* XXX Inbound NAT? */ 5469 &nk->addr[pd2.didx], 5470 nk->port[pd2.didx], NULL, 5471 pd2.ip_sum, icmpsum, 5472 pd->ip_sum, 0, pd2.af); 5473 copyback = 1; 5474 } 5475 5476 if (copyback) { 5477 switch (pd2.af) { 5478 #ifdef INET 5479 case AF_INET: 5480 m_copyback(m, off, ICMP_MINLEN, 5481 (caddr_t)pd->hdr.icmp); 5482 m_copyback(m, ipoff2, sizeof(h2), 5483 (caddr_t)&h2); 5484 break; 5485 #endif /* INET */ 5486 #ifdef INET6 5487 case AF_INET6: 5488 m_copyback(m, off, 5489 sizeof(struct icmp6_hdr), 5490 (caddr_t)pd->hdr.icmp6); 5491 m_copyback(m, ipoff2, sizeof(h2_6), 5492 (caddr_t)&h2_6); 5493 break; 5494 #endif /* INET6 */ 5495 } 5496 m->m_flags &= ~M_HASH; 5497 m_copyback(m, off2, 8, (caddr_t)&th); 5498 } 5499 break; 5500 } 5501 case IPPROTO_UDP: { 5502 struct udphdr uh; 5503 5504 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5505 NULL, reason, pd2.af)) { 5506 DPFPRINTF(PF_DEBUG_MISC, 5507 ("pf: ICMP error message too short " 5508 "(udp)\n")); 5509 return (PF_DROP); 5510 } 5511 5512 key.af = pd2.af; 5513 key.proto = IPPROTO_UDP; 5514 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5515 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5516 key.port[pd2.sidx] = uh.uh_sport; 5517 key.port[pd2.didx] = uh.uh_dport; 5518 5519 STATE_LOOKUP(kif, &key, direction, *state, m); 5520 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5521 5522 /* translate source/destination address, if necessary */ 5523 if ((*state)->key[PF_SK_WIRE] != 5524 (*state)->key[PF_SK_STACK]) { 5525 struct pf_state_key *nk = 5526 (*state)->key[pd->didx]; 5527 5528 if (PF_ANEQ(pd2.src, 5529 &nk->addr[pd2.sidx], pd2.af) || 5530 nk->port[pd2.sidx] != uh.uh_sport) 5531 pf_change_icmp(pd2.src, &uh.uh_sport, 5532 daddr, &nk->addr[pd2.sidx], 5533 nk->port[pd2.sidx], &uh.uh_sum, 5534 pd2.ip_sum, icmpsum, 5535 pd->ip_sum, 1, pd2.af); 5536 5537 if (PF_ANEQ(pd2.dst, 5538 &nk->addr[pd2.didx], pd2.af) || 5539 nk->port[pd2.didx] != uh.uh_dport) 5540 pf_change_icmp(pd2.dst, &uh.uh_dport, 5541 NULL, /* XXX Inbound NAT? */ 5542 &nk->addr[pd2.didx], 5543 nk->port[pd2.didx], &uh.uh_sum, 5544 pd2.ip_sum, icmpsum, 5545 pd->ip_sum, 1, pd2.af); 5546 5547 switch (pd2.af) { 5548 #ifdef INET 5549 case AF_INET: 5550 m_copyback(m, off, ICMP_MINLEN, 5551 (caddr_t)pd->hdr.icmp); 5552 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5553 break; 5554 #endif /* INET */ 5555 #ifdef INET6 5556 case AF_INET6: 5557 m_copyback(m, off, 5558 sizeof(struct icmp6_hdr), 5559 (caddr_t)pd->hdr.icmp6); 5560 m_copyback(m, ipoff2, sizeof(h2_6), 5561 (caddr_t)&h2_6); 5562 break; 5563 #endif /* INET6 */ 5564 } 5565 m->m_flags &= ~M_HASH; 5566 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 5567 } 5568 break; 5569 } 5570 #ifdef INET 5571 case IPPROTO_ICMP: { 5572 struct icmp iih; 5573 5574 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5575 NULL, reason, pd2.af)) { 5576 DPFPRINTF(PF_DEBUG_MISC, 5577 ("pf: ICMP error message too short i" 5578 "(icmp)\n")); 5579 return (PF_DROP); 5580 } 5581 5582 key.af = pd2.af; 5583 key.proto = IPPROTO_ICMP; 5584 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5585 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5586 key.port[0] = key.port[1] = iih.icmp_id; 5587 5588 STATE_LOOKUP(kif, &key, direction, *state, m); 5589 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5590 5591 /* translate source/destination address, if necessary */ 5592 if ((*state)->key[PF_SK_WIRE] != 5593 (*state)->key[PF_SK_STACK]) { 5594 struct pf_state_key *nk = 5595 (*state)->key[pd->didx]; 5596 5597 if (PF_ANEQ(pd2.src, 5598 &nk->addr[pd2.sidx], pd2.af) || 5599 nk->port[pd2.sidx] != iih.icmp_id) 5600 pf_change_icmp(pd2.src, &iih.icmp_id, 5601 daddr, &nk->addr[pd2.sidx], 5602 nk->port[pd2.sidx], NULL, 5603 pd2.ip_sum, icmpsum, 5604 pd->ip_sum, 0, AF_INET); 5605 5606 if (PF_ANEQ(pd2.dst, 5607 &nk->addr[pd2.didx], pd2.af) || 5608 nk->port[pd2.didx] != iih.icmp_id) 5609 pf_change_icmp(pd2.dst, &iih.icmp_id, 5610 NULL, /* XXX Inbound NAT? */ 5611 &nk->addr[pd2.didx], 5612 nk->port[pd2.didx], NULL, 5613 pd2.ip_sum, icmpsum, 5614 pd->ip_sum, 0, AF_INET); 5615 5616 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 5617 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5618 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 5619 m->m_flags &= ~M_HASH; 5620 } 5621 break; 5622 } 5623 #endif /* INET */ 5624 #ifdef INET6 5625 case IPPROTO_ICMPV6: { 5626 struct icmp6_hdr iih; 5627 5628 if (!pf_pull_hdr(m, off2, &iih, 5629 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5630 DPFPRINTF(PF_DEBUG_MISC, 5631 ("pf: ICMP error message too short " 5632 "(icmp6)\n")); 5633 FAIL (PF_DROP); 5634 } 5635 5636 key.af = pd2.af; 5637 key.proto = IPPROTO_ICMPV6; 5638 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5639 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5640 key.port[0] = key.port[1] = iih.icmp6_id; 5641 5642 STATE_LOOKUP(kif, &key, direction, *state, m); 5643 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5644 5645 /* translate source/destination address, if necessary */ 5646 if ((*state)->key[PF_SK_WIRE] != 5647 (*state)->key[PF_SK_STACK]) { 5648 struct pf_state_key *nk = 5649 (*state)->key[pd->didx]; 5650 5651 if (PF_ANEQ(pd2.src, 5652 &nk->addr[pd2.sidx], pd2.af) || 5653 nk->port[pd2.sidx] != iih.icmp6_id) 5654 pf_change_icmp(pd2.src, &iih.icmp6_id, 5655 daddr, &nk->addr[pd2.sidx], 5656 nk->port[pd2.sidx], NULL, 5657 pd2.ip_sum, icmpsum, 5658 pd->ip_sum, 0, AF_INET6); 5659 5660 if (PF_ANEQ(pd2.dst, 5661 &nk->addr[pd2.didx], pd2.af) || 5662 nk->port[pd2.didx] != iih.icmp6_id) 5663 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5664 NULL, /* XXX Inbound NAT? */ 5665 &nk->addr[pd2.didx], 5666 nk->port[pd2.didx], NULL, 5667 pd2.ip_sum, icmpsum, 5668 pd->ip_sum, 0, AF_INET6); 5669 5670 m_copyback(m, off, sizeof(struct icmp6_hdr), 5671 (caddr_t)pd->hdr.icmp6); 5672 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5673 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5674 (caddr_t)&iih); 5675 m->m_flags &= ~M_HASH; 5676 } 5677 break; 5678 } 5679 #endif /* INET6 */ 5680 default: { 5681 key.af = pd2.af; 5682 key.proto = pd2.proto; 5683 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5684 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5685 key.port[0] = key.port[1] = 0; 5686 5687 STATE_LOOKUP(kif, &key, direction, *state, m); 5688 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5689 5690 /* translate source/destination address, if necessary */ 5691 if ((*state)->key[PF_SK_WIRE] != 5692 (*state)->key[PF_SK_STACK]) { 5693 struct pf_state_key *nk = 5694 (*state)->key[pd->didx]; 5695 5696 if (PF_ANEQ(pd2.src, 5697 &nk->addr[pd2.sidx], pd2.af)) 5698 pf_change_icmp(pd2.src, NULL, daddr, 5699 &nk->addr[pd2.sidx], 0, NULL, 5700 pd2.ip_sum, icmpsum, 5701 pd->ip_sum, 0, pd2.af); 5702 5703 if (PF_ANEQ(pd2.dst, 5704 &nk->addr[pd2.didx], pd2.af)) 5705 pf_change_icmp(pd2.src, NULL, 5706 NULL, /* XXX Inbound NAT? */ 5707 &nk->addr[pd2.didx], 0, NULL, 5708 pd2.ip_sum, icmpsum, 5709 pd->ip_sum, 0, pd2.af); 5710 5711 switch (pd2.af) { 5712 #ifdef INET 5713 case AF_INET: 5714 m_copyback(m, off, ICMP_MINLEN, 5715 (caddr_t)pd->hdr.icmp); 5716 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5717 m->m_flags &= ~M_HASH; 5718 break; 5719 #endif /* INET */ 5720 #ifdef INET6 5721 case AF_INET6: 5722 m_copyback(m, off, 5723 sizeof(struct icmp6_hdr), 5724 (caddr_t)pd->hdr.icmp6); 5725 m_copyback(m, ipoff2, sizeof(h2_6), 5726 (caddr_t)&h2_6); 5727 m->m_flags &= ~M_HASH; 5728 break; 5729 #endif /* INET6 */ 5730 } 5731 } 5732 break; 5733 } 5734 } 5735 } 5736 5737 pfsync_update_state(*state); 5738 error = PF_PASS; 5739 done: 5740 if (*state) 5741 lockmgr(&(*state)->lk, LK_RELEASE); 5742 return (error); 5743 } 5744 5745 /* 5746 * Test other connection state. Caller must hold the state locked. 5747 */ 5748 int 5749 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5750 struct mbuf *m, struct pf_pdesc *pd) 5751 { 5752 struct pf_state_peer *src, *dst; 5753 struct pf_state_key_cmp key; 5754 5755 bzero(&key, sizeof(key)); 5756 key.af = pd->af; 5757 key.proto = pd->proto; 5758 if (direction == PF_IN) { 5759 PF_ACPY(&key.addr[0], pd->src, key.af); 5760 PF_ACPY(&key.addr[1], pd->dst, key.af); 5761 key.port[0] = key.port[1] = 0; 5762 } else { 5763 PF_ACPY(&key.addr[1], pd->src, key.af); 5764 PF_ACPY(&key.addr[0], pd->dst, key.af); 5765 key.port[1] = key.port[0] = 0; 5766 } 5767 5768 STATE_LOOKUP(kif, &key, direction, *state, m); 5769 lockmgr(&(*state)->lk, LK_EXCLUSIVE); 5770 5771 if (direction == (*state)->direction) { 5772 src = &(*state)->src; 5773 dst = &(*state)->dst; 5774 } else { 5775 src = &(*state)->dst; 5776 dst = &(*state)->src; 5777 } 5778 5779 /* update states */ 5780 if (src->state < PFOTHERS_SINGLE) 5781 src->state = PFOTHERS_SINGLE; 5782 if (dst->state == PFOTHERS_SINGLE) 5783 dst->state = PFOTHERS_MULTIPLE; 5784 5785 /* update expire time */ 5786 (*state)->expire = time_second; 5787 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5788 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5789 else 5790 (*state)->timeout = PFTM_OTHER_SINGLE; 5791 5792 /* translate source/destination address, if necessary */ 5793 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5794 struct pf_state_key *nk = (*state)->key[pd->didx]; 5795 5796 KKASSERT(nk); 5797 KKASSERT(pd); 5798 KKASSERT(pd->src); 5799 KKASSERT(pd->dst); 5800 switch (pd->af) { 5801 #ifdef INET 5802 case AF_INET: 5803 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5804 pf_change_a(&pd->src->v4.s_addr, 5805 pd->ip_sum, 5806 nk->addr[pd->sidx].v4.s_addr, 5807 0); 5808 5809 5810 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5811 pf_change_a(&pd->dst->v4.s_addr, 5812 pd->ip_sum, 5813 nk->addr[pd->didx].v4.s_addr, 5814 0); 5815 5816 break; 5817 #endif /* INET */ 5818 #ifdef INET6 5819 case AF_INET6: 5820 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5821 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5822 5823 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5824 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5825 #endif /* INET6 */ 5826 } 5827 } 5828 5829 pfsync_update_state(*state); 5830 lockmgr(&(*state)->lk, LK_RELEASE); 5831 return (PF_PASS); 5832 } 5833 5834 /* 5835 * ipoff and off are measured from the start of the mbuf chain. 5836 * h must be at "ipoff" on the mbuf chain. 5837 */ 5838 void * 5839 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5840 u_short *actionp, u_short *reasonp, sa_family_t af) 5841 { 5842 switch (af) { 5843 #ifdef INET 5844 case AF_INET: { 5845 struct ip *h = mtod(m, struct ip *); 5846 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3; 5847 5848 if (fragoff) { 5849 if (fragoff >= len) 5850 ACTION_SET(actionp, PF_PASS); 5851 else { 5852 ACTION_SET(actionp, PF_DROP); 5853 REASON_SET(reasonp, PFRES_FRAG); 5854 } 5855 return (NULL); 5856 } 5857 if (m->m_pkthdr.len < off + len || 5858 h->ip_len < off + len) { 5859 ACTION_SET(actionp, PF_DROP); 5860 REASON_SET(reasonp, PFRES_SHORT); 5861 return (NULL); 5862 } 5863 break; 5864 } 5865 #endif /* INET */ 5866 #ifdef INET6 5867 case AF_INET6: { 5868 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5869 5870 if (m->m_pkthdr.len < off + len || 5871 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5872 (unsigned)(off + len)) { 5873 ACTION_SET(actionp, PF_DROP); 5874 REASON_SET(reasonp, PFRES_SHORT); 5875 return (NULL); 5876 } 5877 break; 5878 } 5879 #endif /* INET6 */ 5880 } 5881 m_copydata(m, off, len, p); 5882 return (p); 5883 } 5884 5885 int 5886 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5887 { 5888 struct sockaddr_in *dst; 5889 int ret = 1; 5890 int check_mpath; 5891 #ifdef INET6 5892 struct sockaddr_in6 *dst6; 5893 struct route_in6 ro; 5894 #else 5895 struct route ro; 5896 #endif 5897 struct radix_node *rn; 5898 struct rtentry *rt; 5899 struct ifnet *ifp; 5900 5901 check_mpath = 0; 5902 bzero(&ro, sizeof(ro)); 5903 switch (af) { 5904 case AF_INET: 5905 dst = satosin(&ro.ro_dst); 5906 dst->sin_family = AF_INET; 5907 dst->sin_len = sizeof(*dst); 5908 dst->sin_addr = addr->v4; 5909 break; 5910 #ifdef INET6 5911 case AF_INET6: 5912 /* 5913 * Skip check for addresses with embedded interface scope, 5914 * as they would always match anyway. 5915 */ 5916 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5917 goto out; 5918 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5919 dst6->sin6_family = AF_INET6; 5920 dst6->sin6_len = sizeof(*dst6); 5921 dst6->sin6_addr = addr->v6; 5922 break; 5923 #endif /* INET6 */ 5924 default: 5925 return (0); 5926 } 5927 5928 /* Skip checks for ipsec interfaces */ 5929 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5930 goto out; 5931 5932 rtalloc_ign((struct route *)&ro, 0); 5933 5934 if (ro.ro_rt != NULL) { 5935 /* No interface given, this is a no-route check */ 5936 if (kif == NULL) 5937 goto out; 5938 5939 if (kif->pfik_ifp == NULL) { 5940 ret = 0; 5941 goto out; 5942 } 5943 5944 /* Perform uRPF check if passed input interface */ 5945 ret = 0; 5946 rn = (struct radix_node *)ro.ro_rt; 5947 do { 5948 rt = (struct rtentry *)rn; 5949 ifp = rt->rt_ifp; 5950 5951 if (kif->pfik_ifp == ifp) 5952 ret = 1; 5953 rn = NULL; 5954 } while (check_mpath == 1 && rn != NULL && ret == 0); 5955 } else 5956 ret = 0; 5957 out: 5958 if (ro.ro_rt != NULL) 5959 RTFREE(ro.ro_rt); 5960 return (ret); 5961 } 5962 5963 int 5964 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5965 { 5966 struct sockaddr_in *dst; 5967 #ifdef INET6 5968 struct sockaddr_in6 *dst6; 5969 struct route_in6 ro; 5970 #else 5971 struct route ro; 5972 #endif 5973 int ret = 0; 5974 5975 ASSERT_LWKT_TOKEN_HELD(&pf_token); 5976 5977 bzero(&ro, sizeof(ro)); 5978 switch (af) { 5979 case AF_INET: 5980 dst = satosin(&ro.ro_dst); 5981 dst->sin_family = AF_INET; 5982 dst->sin_len = sizeof(*dst); 5983 dst->sin_addr = addr->v4; 5984 break; 5985 #ifdef INET6 5986 case AF_INET6: 5987 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5988 dst6->sin6_family = AF_INET6; 5989 dst6->sin6_len = sizeof(*dst6); 5990 dst6->sin6_addr = addr->v6; 5991 break; 5992 #endif /* INET6 */ 5993 default: 5994 return (0); 5995 } 5996 5997 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING)); 5998 5999 if (ro.ro_rt != NULL) { 6000 RTFREE(ro.ro_rt); 6001 } 6002 6003 return (ret); 6004 } 6005 6006 #ifdef INET 6007 void 6008 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6009 struct pf_state *s, struct pf_pdesc *pd) 6010 { 6011 struct mbuf *m0, *m1; 6012 struct route iproute; 6013 struct route *ro = NULL; 6014 struct sockaddr_in *dst; 6015 struct ip *ip; 6016 struct ifnet *ifp = NULL; 6017 struct pf_addr naddr; 6018 struct pf_src_node *sn = NULL; 6019 int error = 0; 6020 int sw_csum; 6021 6022 ASSERT_LWKT_TOKEN_HELD(&pf_token); 6023 6024 if (m == NULL || *m == NULL || r == NULL || 6025 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6026 panic("pf_route: invalid parameters"); 6027 6028 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 6029 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 6030 (*m)->m_pkthdr.pf.routed = 1; 6031 } else { 6032 if ((*m)->m_pkthdr.pf.routed++ > 3) { 6033 m0 = *m; 6034 *m = NULL; 6035 goto bad; 6036 } 6037 } 6038 6039 if (r->rt == PF_DUPTO) { 6040 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 6041 return; 6042 } 6043 } else { 6044 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 6045 return; 6046 } 6047 m0 = *m; 6048 } 6049 6050 if (m0->m_len < sizeof(struct ip)) { 6051 DPFPRINTF(PF_DEBUG_URGENT, 6052 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6053 goto bad; 6054 } 6055 6056 ip = mtod(m0, struct ip *); 6057 6058 ro = &iproute; 6059 bzero((caddr_t)ro, sizeof(*ro)); 6060 dst = satosin(&ro->ro_dst); 6061 dst->sin_family = AF_INET; 6062 dst->sin_len = sizeof(*dst); 6063 dst->sin_addr = ip->ip_dst; 6064 6065 if (r->rt == PF_FASTROUTE) { 6066 rtalloc(ro); 6067 if (ro->ro_rt == 0) { 6068 ipstat.ips_noroute++; 6069 goto bad; 6070 } 6071 6072 ifp = ro->ro_rt->rt_ifp; 6073 ro->ro_rt->rt_use++; 6074 6075 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 6076 dst = satosin(ro->ro_rt->rt_gateway); 6077 } else { 6078 if (TAILQ_EMPTY(&r->rpool.list)) { 6079 DPFPRINTF(PF_DEBUG_URGENT, 6080 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 6081 goto bad; 6082 } 6083 if (s == NULL) { 6084 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 6085 &naddr, NULL, &sn); 6086 if (!PF_AZERO(&naddr, AF_INET)) 6087 dst->sin_addr.s_addr = naddr.v4.s_addr; 6088 ifp = r->rpool.cur->kif ? 6089 r->rpool.cur->kif->pfik_ifp : NULL; 6090 } else { 6091 if (!PF_AZERO(&s->rt_addr, AF_INET)) 6092 dst->sin_addr.s_addr = 6093 s->rt_addr.v4.s_addr; 6094 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6095 } 6096 } 6097 if (ifp == NULL) 6098 goto bad; 6099 6100 if (oifp != ifp) { 6101 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6102 goto bad; 6103 } else if (m0 == NULL) { 6104 goto done; 6105 } 6106 if (m0->m_len < sizeof(struct ip)) { 6107 DPFPRINTF(PF_DEBUG_URGENT, 6108 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6109 goto bad; 6110 } 6111 ip = mtod(m0, struct ip *); 6112 } 6113 6114 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 6115 m0->m_pkthdr.csum_flags |= CSUM_IP; 6116 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 6117 if (sw_csum & CSUM_DELAY_DATA) { 6118 in_delayed_cksum(m0); 6119 sw_csum &= ~CSUM_DELAY_DATA; 6120 } 6121 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 6122 m0->m_pkthdr.csum_iphlen = (ip->ip_hl << 2); 6123 6124 /* 6125 * WARNING! We cannot fragment if the packet was modified from an 6126 * original which expected to be using TSO. In this 6127 * situation we pray that the target interface is 6128 * compatible with the originating interface. 6129 */ 6130 if (ip->ip_len <= ifp->if_mtu || 6131 (m0->m_pkthdr.csum_flags & CSUM_TSO) || 6132 ((ifp->if_hwassist & CSUM_FRAGMENT) && 6133 (ip->ip_off & IP_DF) == 0)) { 6134 ip->ip_len = htons(ip->ip_len); 6135 ip->ip_off = htons(ip->ip_off); 6136 ip->ip_sum = 0; 6137 if (sw_csum & CSUM_DELAY_IP) { 6138 /* From KAME */ 6139 if (ip->ip_v == IPVERSION && 6140 (ip->ip_hl << 2) == sizeof(*ip)) { 6141 ip->ip_sum = in_cksum_hdr(ip); 6142 } else { 6143 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6144 } 6145 } 6146 lwkt_reltoken(&pf_token); 6147 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt); 6148 lwkt_gettoken(&pf_token); 6149 goto done; 6150 } 6151 6152 /* 6153 * Too large for interface; fragment if possible. 6154 * Must be able to put at least 8 bytes per fragment. 6155 */ 6156 if (ip->ip_off & IP_DF) { 6157 ipstat.ips_cantfrag++; 6158 if (r->rt != PF_DUPTO) { 6159 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6160 ifp->if_mtu); 6161 goto done; 6162 } else 6163 goto bad; 6164 } 6165 6166 m1 = m0; 6167 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 6168 if (error) { 6169 goto bad; 6170 } 6171 6172 for (m0 = m1; m0; m0 = m1) { 6173 m1 = m0->m_nextpkt; 6174 m0->m_nextpkt = 0; 6175 if (error == 0) { 6176 lwkt_reltoken(&pf_token); 6177 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6178 NULL); 6179 lwkt_gettoken(&pf_token); 6180 } else 6181 m_freem(m0); 6182 } 6183 6184 if (error == 0) 6185 ipstat.ips_fragmented++; 6186 6187 done: 6188 if (r->rt != PF_DUPTO) 6189 *m = NULL; 6190 if (ro == &iproute && ro->ro_rt) 6191 RTFREE(ro->ro_rt); 6192 return; 6193 6194 bad: 6195 m_freem(m0); 6196 goto done; 6197 } 6198 #endif /* INET */ 6199 6200 #ifdef INET6 6201 void 6202 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6203 struct pf_state *s, struct pf_pdesc *pd) 6204 { 6205 struct mbuf *m0; 6206 struct route_in6 ip6route; 6207 struct route_in6 *ro; 6208 struct sockaddr_in6 *dst; 6209 struct ip6_hdr *ip6; 6210 struct ifnet *ifp = NULL; 6211 struct pf_addr naddr; 6212 struct pf_src_node *sn = NULL; 6213 6214 if (m == NULL || *m == NULL || r == NULL || 6215 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6216 panic("pf_route6: invalid parameters"); 6217 6218 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 6219 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 6220 (*m)->m_pkthdr.pf.routed = 1; 6221 } else { 6222 if ((*m)->m_pkthdr.pf.routed++ > 3) { 6223 m0 = *m; 6224 *m = NULL; 6225 goto bad; 6226 } 6227 } 6228 6229 if (r->rt == PF_DUPTO) { 6230 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) 6231 return; 6232 } else { 6233 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6234 return; 6235 m0 = *m; 6236 } 6237 6238 if (m0->m_len < sizeof(struct ip6_hdr)) { 6239 DPFPRINTF(PF_DEBUG_URGENT, 6240 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6241 goto bad; 6242 } 6243 ip6 = mtod(m0, struct ip6_hdr *); 6244 6245 ro = &ip6route; 6246 bzero((caddr_t)ro, sizeof(*ro)); 6247 dst = (struct sockaddr_in6 *)&ro->ro_dst; 6248 dst->sin6_family = AF_INET6; 6249 dst->sin6_len = sizeof(*dst); 6250 dst->sin6_addr = ip6->ip6_dst; 6251 6252 /* 6253 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 6254 * so make sure pf.flags is clear. 6255 * 6256 * Cheat. XXX why only in the v6 case??? 6257 */ 6258 if (r->rt == PF_FASTROUTE) { 6259 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 6260 m0->m_pkthdr.pf.flags = 0; 6261 /* XXX Re-Check when Upgrading to > 4.4 */ 6262 m0->m_pkthdr.pf.statekey = NULL; 6263 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6264 return; 6265 } 6266 6267 if (TAILQ_EMPTY(&r->rpool.list)) { 6268 DPFPRINTF(PF_DEBUG_URGENT, 6269 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6270 goto bad; 6271 } 6272 if (s == NULL) { 6273 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6274 &naddr, NULL, &sn); 6275 if (!PF_AZERO(&naddr, AF_INET6)) 6276 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6277 &naddr, AF_INET6); 6278 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6279 } else { 6280 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6281 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6282 &s->rt_addr, AF_INET6); 6283 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6284 } 6285 if (ifp == NULL) 6286 goto bad; 6287 6288 if (oifp != ifp) { 6289 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6290 goto bad; 6291 } else if (m0 == NULL) { 6292 goto done; 6293 } 6294 if (m0->m_len < sizeof(struct ip6_hdr)) { 6295 DPFPRINTF(PF_DEBUG_URGENT, 6296 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6297 goto bad; 6298 } 6299 ip6 = mtod(m0, struct ip6_hdr *); 6300 } 6301 6302 /* 6303 * If the packet is too large for the outgoing interface, 6304 * send back an icmp6 error. 6305 */ 6306 if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr)) 6307 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6308 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6309 nd6_output(ifp, ifp, m0, dst, NULL); 6310 } else { 6311 in6_ifstat_inc(ifp, ifs6_in_toobig); 6312 if (r->rt != PF_DUPTO) 6313 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6314 else 6315 goto bad; 6316 } 6317 6318 done: 6319 if (r->rt != PF_DUPTO) 6320 *m = NULL; 6321 return; 6322 6323 bad: 6324 m_freem(m0); 6325 goto done; 6326 } 6327 #endif /* INET6 */ 6328 6329 6330 /* 6331 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6332 * off is the offset where the protocol header starts 6333 * len is the total length of protocol header plus payload 6334 * returns 0 when the checksum is valid, otherwise returns 1. 6335 */ 6336 /* 6337 * XXX 6338 * FreeBSD supports cksum offload for the following drivers. 6339 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4) 6340 * If we can make full use of it we would outperform ipfw/ipfilter in 6341 * very heavy traffic. 6342 * I have not tested 'cause I don't have NICs that supports cksum offload. 6343 * (There might be problems. Typical phenomena would be 6344 * 1. No route message for UDP packet. 6345 * 2. No connection acceptance from external hosts regardless of rule set.) 6346 */ 6347 int 6348 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6349 sa_family_t af) 6350 { 6351 u_int16_t sum = 0; 6352 int hw_assist = 0; 6353 struct ip *ip; 6354 6355 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6356 return (1); 6357 if (m->m_pkthdr.len < off + len) 6358 return (1); 6359 6360 switch (p) { 6361 case IPPROTO_TCP: 6362 case IPPROTO_UDP: 6363 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6364 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6365 sum = m->m_pkthdr.csum_data; 6366 } else { 6367 ip = mtod(m, struct ip *); 6368 sum = in_pseudo(ip->ip_src.s_addr, 6369 ip->ip_dst.s_addr, htonl((u_short)len + 6370 m->m_pkthdr.csum_data + p)); 6371 } 6372 sum ^= 0xffff; 6373 ++hw_assist; 6374 } 6375 break; 6376 case IPPROTO_ICMP: 6377 #ifdef INET6 6378 case IPPROTO_ICMPV6: 6379 #endif /* INET6 */ 6380 break; 6381 default: 6382 return (1); 6383 } 6384 6385 if (!hw_assist) { 6386 switch (af) { 6387 case AF_INET: 6388 if (p == IPPROTO_ICMP) { 6389 if (m->m_len < off) 6390 return (1); 6391 m->m_data += off; 6392 m->m_len -= off; 6393 sum = in_cksum(m, len); 6394 m->m_data -= off; 6395 m->m_len += off; 6396 } else { 6397 if (m->m_len < sizeof(struct ip)) 6398 return (1); 6399 sum = in_cksum_range(m, p, off, len); 6400 if (sum == 0) { 6401 m->m_pkthdr.csum_flags |= 6402 (CSUM_DATA_VALID | 6403 CSUM_PSEUDO_HDR); 6404 m->m_pkthdr.csum_data = 0xffff; 6405 } 6406 } 6407 break; 6408 #ifdef INET6 6409 case AF_INET6: 6410 if (m->m_len < sizeof(struct ip6_hdr)) 6411 return (1); 6412 sum = in6_cksum(m, p, off, len); 6413 /* 6414 * XXX 6415 * IPv6 H/W cksum off-load not supported yet! 6416 * 6417 * if (sum == 0) { 6418 * m->m_pkthdr.csum_flags |= 6419 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 6420 * m->m_pkthdr.csum_data = 0xffff; 6421 *} 6422 */ 6423 break; 6424 #endif /* INET6 */ 6425 default: 6426 return (1); 6427 } 6428 } 6429 if (sum) { 6430 switch (p) { 6431 case IPPROTO_TCP: 6432 tcpstat.tcps_rcvbadsum++; 6433 break; 6434 case IPPROTO_UDP: 6435 udp_stat.udps_badsum++; 6436 break; 6437 case IPPROTO_ICMP: 6438 icmpstat.icps_checksum++; 6439 break; 6440 #ifdef INET6 6441 case IPPROTO_ICMPV6: 6442 icmp6stat.icp6s_checksum++; 6443 break; 6444 #endif /* INET6 */ 6445 } 6446 return (1); 6447 } 6448 return (0); 6449 } 6450 6451 struct pf_divert * 6452 pf_find_divert(struct mbuf *m) 6453 { 6454 struct m_tag *mtag; 6455 6456 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) 6457 return (NULL); 6458 6459 return ((struct pf_divert *)(mtag + 1)); 6460 } 6461 6462 struct pf_divert * 6463 pf_get_divert(struct mbuf *m) 6464 { 6465 struct m_tag *mtag; 6466 6467 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) { 6468 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert), 6469 M_NOWAIT); 6470 if (mtag == NULL) 6471 return (NULL); 6472 bzero(mtag + 1, sizeof(struct pf_divert)); 6473 m_tag_prepend(m, mtag); 6474 } 6475 6476 return ((struct pf_divert *)(mtag + 1)); 6477 } 6478 6479 #ifdef INET 6480 6481 /* 6482 * WARNING: pf_token held shared on entry, THIS IS CPU LOCALIZED CODE 6483 */ 6484 int 6485 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6486 struct ether_header *eh, struct inpcb *inp) 6487 { 6488 struct pfi_kif *kif; 6489 u_short action, reason = 0, log = 0; 6490 struct mbuf *m = *m0; 6491 struct ip *h = NULL; 6492 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6493 struct pf_state *s = NULL; 6494 struct pf_ruleset *ruleset = NULL; 6495 struct pf_pdesc pd; 6496 int off, dirndx; 6497 #ifdef ALTQ 6498 int pqid = 0; 6499 #endif 6500 6501 if (m->m_pkthdr.fw_flags & IPFW_MBUF_CONTINUE) { 6502 /* Skip us; continue in ipfw. */ 6503 return (PF_PASS); 6504 } 6505 6506 if (!pf_status.running) 6507 return (PF_PASS); 6508 6509 memset(&pd, 0, sizeof(pd)); 6510 #ifdef foo 6511 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6512 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6513 else 6514 #endif 6515 kif = (struct pfi_kif *)ifp->if_pf_kif; 6516 6517 if (kif == NULL) { 6518 DPFPRINTF(PF_DEBUG_URGENT, 6519 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6520 return (PF_DROP); 6521 } 6522 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6523 return (PF_PASS); 6524 6525 #ifdef DIAGNOSTIC 6526 if ((m->m_flags & M_PKTHDR) == 0) 6527 panic("non-M_PKTHDR is passed to pf_test"); 6528 #endif /* DIAGNOSTIC */ 6529 6530 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6531 action = PF_DROP; 6532 REASON_SET(&reason, PFRES_SHORT); 6533 log = 1; 6534 goto done; 6535 } 6536 6537 /* 6538 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 6539 * so make sure pf.flags is clear. 6540 */ 6541 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 6542 return (PF_PASS); 6543 m->m_pkthdr.pf.flags = 0; 6544 /* Re-Check when updating to > 4.4 */ 6545 m->m_pkthdr.pf.statekey = NULL; 6546 6547 /* We do IP header normalization and packet reassembly here */ 6548 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6549 action = PF_DROP; 6550 goto done; 6551 } 6552 m = *m0; /* pf_normalize messes with m0 */ 6553 h = mtod(m, struct ip *); 6554 6555 off = h->ip_hl << 2; 6556 if (off < (int)sizeof(*h)) { 6557 action = PF_DROP; 6558 REASON_SET(&reason, PFRES_SHORT); 6559 log = 1; 6560 goto done; 6561 } 6562 6563 pd.src = (struct pf_addr *)&h->ip_src; 6564 pd.dst = (struct pf_addr *)&h->ip_dst; 6565 pd.sport = pd.dport = NULL; 6566 pd.ip_sum = &h->ip_sum; 6567 pd.proto_sum = NULL; 6568 pd.proto = h->ip_p; 6569 pd.dir = dir; 6570 pd.sidx = (dir == PF_IN) ? 0 : 1; 6571 pd.didx = (dir == PF_IN) ? 1 : 0; 6572 pd.af = AF_INET; 6573 pd.tos = h->ip_tos; 6574 pd.tot_len = h->ip_len; 6575 pd.eh = eh; 6576 6577 /* handle fragments that didn't get reassembled by normalization */ 6578 if (h->ip_off & (IP_MF | IP_OFFMASK)) { 6579 action = pf_test_fragment(&r, dir, kif, m, h, 6580 &pd, &a, &ruleset); 6581 goto done; 6582 } 6583 6584 switch (h->ip_p) { 6585 6586 case IPPROTO_TCP: { 6587 struct tcphdr th; 6588 6589 pd.hdr.tcp = &th; 6590 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6591 &action, &reason, AF_INET)) { 6592 log = action != PF_PASS; 6593 goto done; 6594 } 6595 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6596 #ifdef ALTQ 6597 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6598 pqid = 1; 6599 #endif 6600 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6601 if (action == PF_DROP) 6602 goto done; 6603 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6604 &reason); 6605 if (action == PF_PASS) { 6606 r = s->rule.ptr; 6607 a = s->anchor.ptr; 6608 log = s->log; 6609 } else if (s == NULL) { 6610 action = pf_test_rule(&r, &s, dir, kif, 6611 m, off, h, &pd, &a, 6612 &ruleset, NULL, inp); 6613 } 6614 break; 6615 } 6616 6617 case IPPROTO_UDP: { 6618 struct udphdr uh; 6619 6620 pd.hdr.udp = &uh; 6621 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6622 &action, &reason, AF_INET)) { 6623 log = action != PF_PASS; 6624 goto done; 6625 } 6626 if (uh.uh_dport == 0 || 6627 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6628 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6629 action = PF_DROP; 6630 REASON_SET(&reason, PFRES_SHORT); 6631 goto done; 6632 } 6633 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6634 if (action == PF_PASS) { 6635 r = s->rule.ptr; 6636 a = s->anchor.ptr; 6637 log = s->log; 6638 } else if (s == NULL) { 6639 action = pf_test_rule(&r, &s, dir, kif, 6640 m, off, h, &pd, &a, 6641 &ruleset, NULL, inp); 6642 } 6643 break; 6644 } 6645 6646 case IPPROTO_ICMP: { 6647 struct icmp ih; 6648 6649 pd.hdr.icmp = &ih; 6650 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6651 &action, &reason, AF_INET)) { 6652 log = action != PF_PASS; 6653 goto done; 6654 } 6655 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6656 &reason); 6657 if (action == PF_PASS) { 6658 r = s->rule.ptr; 6659 a = s->anchor.ptr; 6660 log = s->log; 6661 } else if (s == NULL) { 6662 action = pf_test_rule(&r, &s, dir, kif, 6663 m, off, h, &pd, &a, 6664 &ruleset, NULL, inp); 6665 } 6666 break; 6667 } 6668 6669 default: 6670 action = pf_test_state_other(&s, dir, kif, m, &pd); 6671 if (action == PF_PASS) { 6672 r = s->rule.ptr; 6673 a = s->anchor.ptr; 6674 log = s->log; 6675 } else if (s == NULL) { 6676 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6677 &pd, &a, &ruleset, NULL, inp); 6678 } 6679 break; 6680 } 6681 6682 done: 6683 if (action == PF_PASS && h->ip_hl > 5 && 6684 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6685 action = PF_DROP; 6686 REASON_SET(&reason, PFRES_IPOPTIONS); 6687 log = 1; 6688 DPFPRINTF(PF_DEBUG_MISC, 6689 ("pf: dropping packet with ip options\n")); 6690 } 6691 6692 if ((s && s->tag) || r->rtableid) 6693 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6694 6695 #if 0 6696 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 6697 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 6698 #endif 6699 6700 #ifdef ALTQ 6701 /* 6702 * Generate a hash code and qid request for ALTQ. A qid of 0 6703 * is allowed and will cause altq to select the default queue. 6704 */ 6705 if (action == PF_PASS) { 6706 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 6707 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6708 m->m_pkthdr.pf.qid = r->pqid; 6709 else 6710 m->m_pkthdr.pf.qid = r->qid; 6711 m->m_pkthdr.pf.ecn_af = AF_INET; 6712 m->m_pkthdr.pf.hdr = h; 6713 /* add connection hash for fairq */ 6714 if (s) { 6715 /* for fairq */ 6716 m->m_pkthdr.pf.state_hash = s->hash; 6717 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 6718 } 6719 } 6720 #endif /* ALTQ */ 6721 6722 /* 6723 * connections redirected to loopback should not match sockets 6724 * bound specifically to loopback due to security implications, 6725 * see tcp_input() and in_pcblookup_listen(). 6726 */ 6727 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6728 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6729 (s->nat_rule.ptr->action == PF_RDR || 6730 s->nat_rule.ptr->action == PF_BINAT) && 6731 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 6732 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6733 6734 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 6735 struct pf_divert *divert; 6736 6737 if ((divert = pf_get_divert(m))) { 6738 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 6739 divert->port = r->divert.port; 6740 divert->addr.ipv4 = r->divert.addr.v4; 6741 } 6742 } 6743 6744 if (log) { 6745 struct pf_rule *lr; 6746 6747 if (s != NULL && s->nat_rule.ptr != NULL && 6748 s->nat_rule.ptr->log & PF_LOG_ALL) 6749 lr = s->nat_rule.ptr; 6750 else 6751 lr = r; 6752 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 6753 &pd); 6754 } 6755 6756 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6757 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6758 6759 if (action == PF_PASS || r->action == PF_DROP) { 6760 dirndx = (dir == PF_OUT); 6761 r->packets[dirndx]++; 6762 r->bytes[dirndx] += pd.tot_len; 6763 if (a != NULL) { 6764 a->packets[dirndx]++; 6765 a->bytes[dirndx] += pd.tot_len; 6766 } 6767 if (s != NULL) { 6768 if (s->nat_rule.ptr != NULL) { 6769 s->nat_rule.ptr->packets[dirndx]++; 6770 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6771 } 6772 if (s->src_node != NULL) { 6773 s->src_node->packets[dirndx]++; 6774 s->src_node->bytes[dirndx] += pd.tot_len; 6775 } 6776 if (s->nat_src_node != NULL) { 6777 s->nat_src_node->packets[dirndx]++; 6778 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6779 } 6780 dirndx = (dir == s->direction) ? 0 : 1; 6781 s->packets[dirndx]++; 6782 s->bytes[dirndx] += pd.tot_len; 6783 } 6784 tr = r; 6785 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6786 if (nr != NULL && r == &pf_default_rule) 6787 tr = nr; 6788 if (tr->src.addr.type == PF_ADDR_TABLE) 6789 pfr_update_stats(tr->src.addr.p.tbl, 6790 (s == NULL) ? pd.src : 6791 &s->key[(s->direction == PF_IN)]-> 6792 addr[(s->direction == PF_OUT)], 6793 pd.af, pd.tot_len, dir == PF_OUT, 6794 r->action == PF_PASS, tr->src.neg); 6795 if (tr->dst.addr.type == PF_ADDR_TABLE) 6796 pfr_update_stats(tr->dst.addr.p.tbl, 6797 (s == NULL) ? pd.dst : 6798 &s->key[(s->direction == PF_IN)]-> 6799 addr[(s->direction == PF_IN)], 6800 pd.af, pd.tot_len, dir == PF_OUT, 6801 r->action == PF_PASS, tr->dst.neg); 6802 } 6803 6804 6805 if (action == PF_SYNPROXY_DROP) { 6806 m_freem(*m0); 6807 *m0 = NULL; 6808 action = PF_PASS; 6809 } else if (r->rt) { 6810 /* pf_route can free the mbuf causing *m0 to become NULL */ 6811 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6812 } 6813 6814 return (action); 6815 } 6816 #endif /* INET */ 6817 6818 #ifdef INET6 6819 6820 /* 6821 * WARNING: pf_token held shared on entry, THIS IS CPU LOCALIZED CODE 6822 */ 6823 int 6824 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6825 struct ether_header *eh, struct inpcb *inp) 6826 { 6827 struct pfi_kif *kif; 6828 u_short action, reason = 0, log = 0; 6829 struct mbuf *m = *m0, *n = NULL; 6830 struct ip6_hdr *h = NULL; 6831 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6832 struct pf_state *s = NULL; 6833 struct pf_ruleset *ruleset = NULL; 6834 struct pf_pdesc pd; 6835 int off, terminal = 0, dirndx, rh_cnt = 0; 6836 6837 if (!pf_status.running) 6838 return (PF_PASS); 6839 6840 memset(&pd, 0, sizeof(pd)); 6841 #ifdef foo 6842 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6843 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6844 else 6845 #endif 6846 kif = (struct pfi_kif *)ifp->if_pf_kif; 6847 6848 if (kif == NULL) { 6849 DPFPRINTF(PF_DEBUG_URGENT, 6850 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6851 return (PF_DROP); 6852 } 6853 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6854 return (PF_PASS); 6855 6856 #ifdef DIAGNOSTIC 6857 if ((m->m_flags & M_PKTHDR) == 0) 6858 panic("non-M_PKTHDR is passed to pf_test6"); 6859 #endif /* DIAGNOSTIC */ 6860 6861 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6862 action = PF_DROP; 6863 REASON_SET(&reason, PFRES_SHORT); 6864 log = 1; 6865 goto done; 6866 } 6867 6868 /* 6869 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 6870 * so make sure pf.flags is clear. 6871 */ 6872 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 6873 return (PF_PASS); 6874 m->m_pkthdr.pf.flags = 0; 6875 /* Re-Check when updating to > 4.4 */ 6876 m->m_pkthdr.pf.statekey = NULL; 6877 6878 /* We do IP header normalization and packet reassembly here */ 6879 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6880 action = PF_DROP; 6881 goto done; 6882 } 6883 m = *m0; /* pf_normalize messes with m0 */ 6884 h = mtod(m, struct ip6_hdr *); 6885 6886 #if 1 6887 /* 6888 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6889 * will do something bad, so drop the packet for now. 6890 */ 6891 if (htons(h->ip6_plen) == 0) { 6892 action = PF_DROP; 6893 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6894 goto done; 6895 } 6896 #endif 6897 6898 pd.src = (struct pf_addr *)&h->ip6_src; 6899 pd.dst = (struct pf_addr *)&h->ip6_dst; 6900 pd.sport = pd.dport = NULL; 6901 pd.ip_sum = NULL; 6902 pd.proto_sum = NULL; 6903 pd.dir = dir; 6904 pd.sidx = (dir == PF_IN) ? 0 : 1; 6905 pd.didx = (dir == PF_IN) ? 1 : 0; 6906 pd.af = AF_INET6; 6907 pd.tos = 0; 6908 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6909 pd.eh = eh; 6910 6911 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6912 pd.proto = h->ip6_nxt; 6913 do { 6914 switch (pd.proto) { 6915 case IPPROTO_FRAGMENT: 6916 action = pf_test_fragment(&r, dir, kif, m, h, 6917 &pd, &a, &ruleset); 6918 if (action == PF_DROP) 6919 REASON_SET(&reason, PFRES_FRAG); 6920 goto done; 6921 case IPPROTO_ROUTING: { 6922 struct ip6_rthdr rthdr; 6923 6924 if (rh_cnt++) { 6925 DPFPRINTF(PF_DEBUG_MISC, 6926 ("pf: IPv6 more than one rthdr\n")); 6927 action = PF_DROP; 6928 REASON_SET(&reason, PFRES_IPOPTIONS); 6929 log = 1; 6930 goto done; 6931 } 6932 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6933 &reason, pd.af)) { 6934 DPFPRINTF(PF_DEBUG_MISC, 6935 ("pf: IPv6 short rthdr\n")); 6936 action = PF_DROP; 6937 REASON_SET(&reason, PFRES_SHORT); 6938 log = 1; 6939 goto done; 6940 } 6941 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6942 DPFPRINTF(PF_DEBUG_MISC, 6943 ("pf: IPv6 rthdr0\n")); 6944 action = PF_DROP; 6945 REASON_SET(&reason, PFRES_IPOPTIONS); 6946 log = 1; 6947 goto done; 6948 } 6949 /* FALLTHROUGH */ 6950 } 6951 case IPPROTO_AH: 6952 case IPPROTO_HOPOPTS: 6953 case IPPROTO_DSTOPTS: { 6954 /* get next header and header length */ 6955 struct ip6_ext opt6; 6956 6957 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6958 NULL, &reason, pd.af)) { 6959 DPFPRINTF(PF_DEBUG_MISC, 6960 ("pf: IPv6 short opt\n")); 6961 action = PF_DROP; 6962 log = 1; 6963 goto done; 6964 } 6965 if (pd.proto == IPPROTO_AH) 6966 off += (opt6.ip6e_len + 2) * 4; 6967 else 6968 off += (opt6.ip6e_len + 1) * 8; 6969 pd.proto = opt6.ip6e_nxt; 6970 /* goto the next header */ 6971 break; 6972 } 6973 default: 6974 terminal++; 6975 break; 6976 } 6977 } while (!terminal); 6978 6979 /* if there's no routing header, use unmodified mbuf for checksumming */ 6980 if (!n) 6981 n = m; 6982 6983 switch (pd.proto) { 6984 6985 case IPPROTO_TCP: { 6986 struct tcphdr th; 6987 6988 pd.hdr.tcp = &th; 6989 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6990 &action, &reason, AF_INET6)) { 6991 log = action != PF_PASS; 6992 goto done; 6993 } 6994 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6995 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6996 if (action == PF_DROP) 6997 goto done; 6998 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6999 &reason); 7000 if (action == PF_PASS) { 7001 r = s->rule.ptr; 7002 a = s->anchor.ptr; 7003 log = s->log; 7004 } else if (s == NULL) { 7005 action = pf_test_rule(&r, &s, dir, kif, 7006 m, off, h, &pd, &a, 7007 &ruleset, NULL, inp); 7008 } 7009 break; 7010 } 7011 7012 case IPPROTO_UDP: { 7013 struct udphdr uh; 7014 7015 pd.hdr.udp = &uh; 7016 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7017 &action, &reason, AF_INET6)) { 7018 log = action != PF_PASS; 7019 goto done; 7020 } 7021 if (uh.uh_dport == 0 || 7022 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7023 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7024 action = PF_DROP; 7025 REASON_SET(&reason, PFRES_SHORT); 7026 goto done; 7027 } 7028 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7029 if (action == PF_PASS) { 7030 r = s->rule.ptr; 7031 a = s->anchor.ptr; 7032 log = s->log; 7033 } else if (s == NULL) { 7034 action = pf_test_rule(&r, &s, dir, kif, 7035 m, off, h, &pd, &a, 7036 &ruleset, NULL, inp); 7037 } 7038 break; 7039 } 7040 7041 case IPPROTO_ICMPV6: { 7042 struct icmp6_hdr ih; 7043 7044 pd.hdr.icmp6 = &ih; 7045 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 7046 &action, &reason, AF_INET6)) { 7047 log = action != PF_PASS; 7048 goto done; 7049 } 7050 action = pf_test_state_icmp(&s, dir, kif, 7051 m, off, h, &pd, &reason); 7052 if (action == PF_PASS) { 7053 r = s->rule.ptr; 7054 a = s->anchor.ptr; 7055 log = s->log; 7056 } else if (s == NULL) { 7057 action = pf_test_rule(&r, &s, dir, kif, 7058 m, off, h, &pd, &a, 7059 &ruleset, NULL, inp); 7060 } 7061 break; 7062 } 7063 7064 default: 7065 action = pf_test_state_other(&s, dir, kif, m, &pd); 7066 if (action == PF_PASS) { 7067 r = s->rule.ptr; 7068 a = s->anchor.ptr; 7069 log = s->log; 7070 } else if (s == NULL) { 7071 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 7072 &pd, &a, &ruleset, NULL, inp); 7073 } 7074 break; 7075 } 7076 7077 done: 7078 if (n != m) { 7079 m_freem(n); 7080 n = NULL; 7081 } 7082 7083 /* handle dangerous IPv6 extension headers. */ 7084 if (action == PF_PASS && rh_cnt && 7085 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 7086 action = PF_DROP; 7087 REASON_SET(&reason, PFRES_IPOPTIONS); 7088 log = 1; 7089 DPFPRINTF(PF_DEBUG_MISC, 7090 ("pf: dropping packet with dangerous v6 headers\n")); 7091 } 7092 7093 if ((s && s->tag) || r->rtableid) 7094 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 7095 7096 #if 0 7097 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 7098 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 7099 #endif 7100 7101 #ifdef ALTQ 7102 /* 7103 * Generate a hash code and qid request for ALTQ. A qid of 0 7104 * is allowed and will cause altq to select the default queue. 7105 */ 7106 if (action == PF_PASS) { 7107 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 7108 if (pd.tos & IPTOS_LOWDELAY) 7109 m->m_pkthdr.pf.qid = r->pqid; 7110 else 7111 m->m_pkthdr.pf.qid = r->qid; 7112 m->m_pkthdr.pf.ecn_af = AF_INET6; 7113 m->m_pkthdr.pf.hdr = h; 7114 if (s) { 7115 /* for fairq */ 7116 m->m_pkthdr.pf.state_hash = s->hash; 7117 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 7118 } 7119 } 7120 #endif /* ALTQ */ 7121 7122 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7123 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7124 (s->nat_rule.ptr->action == PF_RDR || 7125 s->nat_rule.ptr->action == PF_BINAT) && 7126 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7127 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 7128 7129 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 7130 struct pf_divert *divert; 7131 7132 if ((divert = pf_get_divert(m))) { 7133 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 7134 divert->port = r->divert.port; 7135 divert->addr.ipv6 = r->divert.addr.v6; 7136 } 7137 } 7138 7139 if (log) { 7140 struct pf_rule *lr; 7141 7142 if (s != NULL && s->nat_rule.ptr != NULL && 7143 s->nat_rule.ptr->log & PF_LOG_ALL) 7144 lr = s->nat_rule.ptr; 7145 else 7146 lr = r; 7147 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 7148 &pd); 7149 } 7150 7151 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7152 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7153 7154 if (action == PF_PASS || r->action == PF_DROP) { 7155 dirndx = (dir == PF_OUT); 7156 r->packets[dirndx]++; 7157 r->bytes[dirndx] += pd.tot_len; 7158 if (a != NULL) { 7159 a->packets[dirndx]++; 7160 a->bytes[dirndx] += pd.tot_len; 7161 } 7162 if (s != NULL) { 7163 if (s->nat_rule.ptr != NULL) { 7164 s->nat_rule.ptr->packets[dirndx]++; 7165 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7166 } 7167 if (s->src_node != NULL) { 7168 s->src_node->packets[dirndx]++; 7169 s->src_node->bytes[dirndx] += pd.tot_len; 7170 } 7171 if (s->nat_src_node != NULL) { 7172 s->nat_src_node->packets[dirndx]++; 7173 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7174 } 7175 dirndx = (dir == s->direction) ? 0 : 1; 7176 s->packets[dirndx]++; 7177 s->bytes[dirndx] += pd.tot_len; 7178 } 7179 tr = r; 7180 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7181 if (nr != NULL && r == &pf_default_rule) 7182 tr = nr; 7183 if (tr->src.addr.type == PF_ADDR_TABLE) 7184 pfr_update_stats(tr->src.addr.p.tbl, 7185 (s == NULL) ? pd.src : 7186 &s->key[(s->direction == PF_IN)]->addr[0], 7187 pd.af, pd.tot_len, dir == PF_OUT, 7188 r->action == PF_PASS, tr->src.neg); 7189 if (tr->dst.addr.type == PF_ADDR_TABLE) 7190 pfr_update_stats(tr->dst.addr.p.tbl, 7191 (s == NULL) ? pd.dst : 7192 &s->key[(s->direction == PF_IN)]->addr[1], 7193 pd.af, pd.tot_len, dir == PF_OUT, 7194 r->action == PF_PASS, tr->dst.neg); 7195 } 7196 7197 7198 if (action == PF_SYNPROXY_DROP) { 7199 m_freem(*m0); 7200 *m0 = NULL; 7201 action = PF_PASS; 7202 } else if (r->rt) 7203 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7204 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 7205 7206 return (action); 7207 } 7208 #endif /* INET6 */ 7209 7210 int 7211 pf_check_congestion(struct ifqueue *ifq) 7212 { 7213 return (0); 7214 } 7215