1 /* $OpenBSD: pf.c,v 1.614 2008/08/02 12:34:37 henning Exp $ */ 2 3 /* 4 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 5 * 6 * Copyright (c) 2001 Daniel Hartmeier 7 * Copyright (c) 2002 - 2008 Henning Brauer 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * - Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * - Redistributions in binary form must reproduce the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer in the documentation and/or other materials provided 19 * with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 31 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 * 34 * Effort sponsored in part by the Defense Advanced Research Projects 35 * Agency (DARPA) and Air Force Research Laboratory, Air Force 36 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 37 * 38 */ 39 40 #include "opt_inet.h" 41 #include "opt_inet6.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/filio.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/kernel.h> 51 #include <sys/time.h> 52 #include <sys/sysctl.h> 53 #include <sys/endian.h> 54 #include <sys/proc.h> 55 #include <sys/kthread.h> 56 57 #include <machine/inttypes.h> 58 59 #include <sys/md5.h> 60 61 #include <net/if.h> 62 #include <net/if_types.h> 63 #include <net/bpf.h> 64 #include <net/netisr.h> 65 #include <net/route.h> 66 67 #include <netinet/in.h> 68 #include <netinet/in_var.h> 69 #include <netinet/in_systm.h> 70 #include <netinet/ip.h> 71 #include <netinet/ip_var.h> 72 #include <netinet/tcp.h> 73 #include <netinet/tcp_seq.h> 74 #include <netinet/udp.h> 75 #include <netinet/ip_icmp.h> 76 #include <netinet/in_pcb.h> 77 #include <netinet/tcp_timer.h> 78 #include <netinet/tcp_var.h> 79 #include <netinet/udp_var.h> 80 #include <netinet/icmp_var.h> 81 #include <netinet/if_ether.h> 82 83 #include <net/pf/pfvar.h> 84 #include <net/pf/if_pflog.h> 85 86 #include <net/pf/if_pfsync.h> 87 88 #ifdef INET6 89 #include <netinet/ip6.h> 90 #include <netinet/in_pcb.h> 91 #include <netinet/icmp6.h> 92 #include <netinet6/nd6.h> 93 #include <netinet6/ip6_var.h> 94 #include <netinet6/in6_pcb.h> 95 #endif /* INET6 */ 96 97 #include <sys/in_cksum.h> 98 #include <sys/ucred.h> 99 #include <machine/limits.h> 100 #include <sys/msgport2.h> 101 #include <net/netmsg2.h> 102 103 extern int ip_optcopy(struct ip *, struct ip *); 104 extern int debug_pfugidhack; 105 106 struct lwkt_token pf_token = LWKT_TOKEN_INITIALIZER(pf_token); 107 108 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x 109 110 /* 111 * Global variables 112 */ 113 114 /* mask radix tree */ 115 struct radix_node_head *pf_maskhead; 116 117 /* state tables */ 118 struct pf_state_tree pf_statetbl; 119 120 struct pf_altqqueue pf_altqs[2]; 121 struct pf_palist pf_pabuf; 122 struct pf_altqqueue *pf_altqs_active; 123 struct pf_altqqueue *pf_altqs_inactive; 124 struct pf_status pf_status; 125 126 u_int32_t ticket_altqs_active; 127 u_int32_t ticket_altqs_inactive; 128 int altqs_inactive_open; 129 u_int32_t ticket_pabuf; 130 131 MD5_CTX pf_tcp_secret_ctx; 132 u_char pf_tcp_secret[16]; 133 int pf_tcp_secret_init; 134 int pf_tcp_iss_off; 135 136 struct pf_anchor_stackframe { 137 struct pf_ruleset *rs; 138 struct pf_rule *r; 139 struct pf_anchor_node *parent; 140 struct pf_anchor *child; 141 } pf_anchor_stack[64]; 142 143 struct malloc_type *pf_src_tree_pl, *pf_rule_pl, *pf_pooladdr_pl; 144 struct malloc_type *pf_state_pl, *pf_state_key_pl, *pf_state_item_pl; 145 struct malloc_type *pf_altq_pl; 146 147 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 148 149 void pf_init_threshold(struct pf_threshold *, u_int32_t, 150 u_int32_t); 151 void pf_add_threshold(struct pf_threshold *); 152 int pf_check_threshold(struct pf_threshold *); 153 154 void pf_change_ap(struct pf_addr *, u_int16_t *, 155 u_int16_t *, u_int16_t *, struct pf_addr *, 156 u_int16_t, u_int8_t, sa_family_t); 157 int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 158 struct tcphdr *, struct pf_state_peer *); 159 #ifdef INET6 160 void pf_change_a6(struct pf_addr *, u_int16_t *, 161 struct pf_addr *, u_int8_t); 162 #endif /* INET6 */ 163 void pf_change_icmp(struct pf_addr *, u_int16_t *, 164 struct pf_addr *, struct pf_addr *, u_int16_t, 165 u_int16_t *, u_int16_t *, u_int16_t *, 166 u_int16_t *, u_int8_t, sa_family_t); 167 void pf_send_tcp(const struct pf_rule *, sa_family_t, 168 const struct pf_addr *, const struct pf_addr *, 169 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 170 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 171 u_int16_t, struct ether_header *, struct ifnet *); 172 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 173 sa_family_t, struct pf_rule *); 174 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 175 int, int, struct pfi_kif *, 176 struct pf_addr *, u_int16_t, struct pf_addr *, 177 u_int16_t, int); 178 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 179 int, int, struct pfi_kif *, struct pf_src_node **, 180 struct pf_state_key **, struct pf_state_key **, 181 struct pf_state_key **, struct pf_state_key **, 182 struct pf_addr *, struct pf_addr *, 183 u_int16_t, u_int16_t); 184 void pf_detach_state(struct pf_state *); 185 int pf_state_key_setup(struct pf_pdesc *, struct pf_rule *, 186 struct pf_state_key **, struct pf_state_key **, 187 struct pf_state_key **, struct pf_state_key **, 188 struct pf_addr *, struct pf_addr *, 189 u_int16_t, u_int16_t); 190 void pf_state_key_detach(struct pf_state *, int); 191 u_int32_t pf_tcp_iss(struct pf_pdesc *); 192 int pf_test_rule(struct pf_rule **, struct pf_state **, 193 int, struct pfi_kif *, struct mbuf *, int, 194 void *, struct pf_pdesc *, struct pf_rule **, 195 struct pf_ruleset **, struct ifqueue *, struct inpcb *); 196 static __inline int pf_create_state(struct pf_rule *, struct pf_rule *, 197 struct pf_rule *, struct pf_pdesc *, 198 struct pf_src_node *, struct pf_state_key *, 199 struct pf_state_key *, struct pf_state_key *, 200 struct pf_state_key *, struct mbuf *, int, 201 u_int16_t, u_int16_t, int *, struct pfi_kif *, 202 struct pf_state **, int, u_int16_t, u_int16_t, 203 int); 204 int pf_test_fragment(struct pf_rule **, int, 205 struct pfi_kif *, struct mbuf *, void *, 206 struct pf_pdesc *, struct pf_rule **, 207 struct pf_ruleset **); 208 int pf_tcp_track_full(struct pf_state_peer *, 209 struct pf_state_peer *, struct pf_state **, 210 struct pfi_kif *, struct mbuf *, int, 211 struct pf_pdesc *, u_short *, int *); 212 int pf_tcp_track_sloppy(struct pf_state_peer *, 213 struct pf_state_peer *, struct pf_state **, 214 struct pf_pdesc *, u_short *); 215 int pf_test_state_tcp(struct pf_state **, int, 216 struct pfi_kif *, struct mbuf *, int, 217 void *, struct pf_pdesc *, u_short *); 218 int pf_test_state_udp(struct pf_state **, int, 219 struct pfi_kif *, struct mbuf *, int, 220 void *, struct pf_pdesc *); 221 int pf_test_state_icmp(struct pf_state **, int, 222 struct pfi_kif *, struct mbuf *, int, 223 void *, struct pf_pdesc *, u_short *); 224 int pf_test_state_other(struct pf_state **, int, 225 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 226 void pf_step_into_anchor(int *, struct pf_ruleset **, int, 227 struct pf_rule **, struct pf_rule **, int *); 228 int pf_step_out_of_anchor(int *, struct pf_ruleset **, 229 int, struct pf_rule **, struct pf_rule **, 230 int *); 231 void pf_hash(struct pf_addr *, struct pf_addr *, 232 struct pf_poolhashkey *, sa_family_t); 233 int pf_map_addr(u_int8_t, struct pf_rule *, 234 struct pf_addr *, struct pf_addr *, 235 struct pf_addr *, struct pf_src_node **); 236 int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 237 struct pf_addr *, struct pf_addr *, u_int16_t, 238 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 239 struct pf_src_node **); 240 void pf_route(struct mbuf **, struct pf_rule *, int, 241 struct ifnet *, struct pf_state *, 242 struct pf_pdesc *); 243 void pf_route6(struct mbuf **, struct pf_rule *, int, 244 struct ifnet *, struct pf_state *, 245 struct pf_pdesc *); 246 u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 247 sa_family_t); 248 u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 249 sa_family_t); 250 u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 251 u_int16_t); 252 void pf_set_rt_ifp(struct pf_state *, 253 struct pf_addr *); 254 int pf_check_proto_cksum(struct mbuf *, int, int, 255 u_int8_t, sa_family_t); 256 struct pf_divert *pf_get_divert(struct mbuf *); 257 void pf_print_state_parts(struct pf_state *, 258 struct pf_state_key *, struct pf_state_key *); 259 int pf_addr_wrap_neq(struct pf_addr_wrap *, 260 struct pf_addr_wrap *); 261 struct pf_state *pf_find_state(struct pfi_kif *, 262 struct pf_state_key_cmp *, u_int, struct mbuf *); 263 int pf_src_connlimit(struct pf_state **); 264 int pf_check_congestion(struct ifqueue *); 265 266 extern int pf_end_threads; 267 268 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 269 { &pf_state_pl, PFSTATE_HIWAT }, 270 { &pf_src_tree_pl, PFSNODE_HIWAT }, 271 { &pf_frent_pl, PFFRAG_FRENT_HIWAT }, 272 { &pfr_ktable_pl, PFR_KTABLE_HIWAT }, 273 { &pfr_kentry_pl, PFR_KENTRY_HIWAT } 274 }; 275 276 #define STATE_LOOKUP(i, k, d, s, m) \ 277 do { \ 278 s = pf_find_state(i, k, d, m); \ 279 if (s == NULL || (s)->timeout == PFTM_PURGE) \ 280 return (PF_DROP); \ 281 if (d == PF_OUT && \ 282 (((s)->rule.ptr->rt == PF_ROUTETO && \ 283 (s)->rule.ptr->direction == PF_OUT) || \ 284 ((s)->rule.ptr->rt == PF_REPLYTO && \ 285 (s)->rule.ptr->direction == PF_IN)) && \ 286 (s)->rt_kif != NULL && \ 287 (s)->rt_kif != i) \ 288 return (PF_PASS); \ 289 } while (0) 290 291 #define BOUND_IFACE(r, k) \ 292 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all 293 294 #define STATE_INC_COUNTERS(s) \ 295 do { \ 296 s->rule.ptr->states_cur++; \ 297 s->rule.ptr->states_tot++; \ 298 if (s->anchor.ptr != NULL) { \ 299 s->anchor.ptr->states_cur++; \ 300 s->anchor.ptr->states_tot++; \ 301 } \ 302 if (s->nat_rule.ptr != NULL) { \ 303 s->nat_rule.ptr->states_cur++; \ 304 s->nat_rule.ptr->states_tot++; \ 305 } \ 306 } while (0) 307 308 #define STATE_DEC_COUNTERS(s) \ 309 do { \ 310 if (s->nat_rule.ptr != NULL) \ 311 s->nat_rule.ptr->states_cur--; \ 312 if (s->anchor.ptr != NULL) \ 313 s->anchor.ptr->states_cur--; \ 314 s->rule.ptr->states_cur--; \ 315 } while (0) 316 317 static MALLOC_DEFINE(M_PFSTATEPL, "pfstatepl", "pf state pool list"); 318 static MALLOC_DEFINE(M_PFSRCTREEPL, "pfsrctpl", "pf source tree pool list"); 319 static MALLOC_DEFINE(M_PFSTATEKEYPL, "pfstatekeypl", "pf state key pool list"); 320 static MALLOC_DEFINE(M_PFSTATEITEMPL, "pfstateitempl", "pf state item pool list"); 321 322 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 323 static __inline int pf_state_compare_key(struct pf_state_key *, 324 struct pf_state_key *); 325 static __inline int pf_state_compare_id(struct pf_state *, 326 struct pf_state *); 327 328 struct pf_src_tree tree_src_tracking; 329 330 struct pf_state_tree_id tree_id; 331 struct pf_state_queue state_list; 332 333 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 334 RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key); 335 RB_GENERATE(pf_state_tree_id, pf_state, 336 entry_id, pf_state_compare_id); 337 338 static __inline int 339 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 340 { 341 int diff; 342 343 if (a->rule.ptr > b->rule.ptr) 344 return (1); 345 if (a->rule.ptr < b->rule.ptr) 346 return (-1); 347 if ((diff = a->af - b->af) != 0) 348 return (diff); 349 switch (a->af) { 350 #ifdef INET 351 case AF_INET: 352 if (a->addr.addr32[0] > b->addr.addr32[0]) 353 return (1); 354 if (a->addr.addr32[0] < b->addr.addr32[0]) 355 return (-1); 356 break; 357 #endif /* INET */ 358 #ifdef INET6 359 case AF_INET6: 360 if (a->addr.addr32[3] > b->addr.addr32[3]) 361 return (1); 362 if (a->addr.addr32[3] < b->addr.addr32[3]) 363 return (-1); 364 if (a->addr.addr32[2] > b->addr.addr32[2]) 365 return (1); 366 if (a->addr.addr32[2] < b->addr.addr32[2]) 367 return (-1); 368 if (a->addr.addr32[1] > b->addr.addr32[1]) 369 return (1); 370 if (a->addr.addr32[1] < b->addr.addr32[1]) 371 return (-1); 372 if (a->addr.addr32[0] > b->addr.addr32[0]) 373 return (1); 374 if (a->addr.addr32[0] < b->addr.addr32[0]) 375 return (-1); 376 break; 377 #endif /* INET6 */ 378 } 379 return (0); 380 } 381 382 u_int32_t 383 pf_state_hash(struct pf_state_key *sk) 384 { 385 u_int32_t hv = (u_int32_t)(((intptr_t)sk >> 6) ^ ((intptr_t)sk >> 15)); 386 if (hv == 0) /* disallow 0 */ 387 hv = 1; 388 return(hv); 389 } 390 391 #ifdef INET6 392 void 393 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 394 { 395 switch (af) { 396 #ifdef INET 397 case AF_INET: 398 dst->addr32[0] = src->addr32[0]; 399 break; 400 #endif /* INET */ 401 case AF_INET6: 402 dst->addr32[0] = src->addr32[0]; 403 dst->addr32[1] = src->addr32[1]; 404 dst->addr32[2] = src->addr32[2]; 405 dst->addr32[3] = src->addr32[3]; 406 break; 407 } 408 } 409 #endif /* INET6 */ 410 411 void 412 pf_init_threshold(struct pf_threshold *threshold, 413 u_int32_t limit, u_int32_t seconds) 414 { 415 threshold->limit = limit * PF_THRESHOLD_MULT; 416 threshold->seconds = seconds; 417 threshold->count = 0; 418 threshold->last = time_second; 419 } 420 421 void 422 pf_add_threshold(struct pf_threshold *threshold) 423 { 424 u_int32_t t = time_second, diff = t - threshold->last; 425 426 if (diff >= threshold->seconds) 427 threshold->count = 0; 428 else 429 threshold->count -= threshold->count * diff / 430 threshold->seconds; 431 threshold->count += PF_THRESHOLD_MULT; 432 threshold->last = t; 433 } 434 435 int 436 pf_check_threshold(struct pf_threshold *threshold) 437 { 438 return (threshold->count > threshold->limit); 439 } 440 441 int 442 pf_src_connlimit(struct pf_state **state) 443 { 444 int bad = 0; 445 446 (*state)->src_node->conn++; 447 (*state)->src.tcp_est = 1; 448 pf_add_threshold(&(*state)->src_node->conn_rate); 449 450 if ((*state)->rule.ptr->max_src_conn && 451 (*state)->rule.ptr->max_src_conn < 452 (*state)->src_node->conn) { 453 pf_status.lcounters[LCNT_SRCCONN]++; 454 bad++; 455 } 456 457 if ((*state)->rule.ptr->max_src_conn_rate.limit && 458 pf_check_threshold(&(*state)->src_node->conn_rate)) { 459 pf_status.lcounters[LCNT_SRCCONNRATE]++; 460 bad++; 461 } 462 463 if (!bad) 464 return (0); 465 466 if ((*state)->rule.ptr->overload_tbl) { 467 struct pfr_addr p; 468 u_int32_t killed = 0; 469 470 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 471 if (pf_status.debug >= PF_DEBUG_MISC) { 472 kprintf("pf_src_connlimit: blocking address "); 473 pf_print_host(&(*state)->src_node->addr, 0, 474 (*state)->key[PF_SK_WIRE]->af); 475 } 476 477 bzero(&p, sizeof(p)); 478 p.pfra_af = (*state)->key[PF_SK_WIRE]->af; 479 switch ((*state)->key[PF_SK_WIRE]->af) { 480 #ifdef INET 481 case AF_INET: 482 p.pfra_net = 32; 483 p.pfra_ip4addr = (*state)->src_node->addr.v4; 484 break; 485 #endif /* INET */ 486 #ifdef INET6 487 case AF_INET6: 488 p.pfra_net = 128; 489 p.pfra_ip6addr = (*state)->src_node->addr.v6; 490 break; 491 #endif /* INET6 */ 492 } 493 494 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 495 &p, time_second); 496 497 /* kill existing states if that's required. */ 498 if ((*state)->rule.ptr->flush) { 499 struct pf_state_key *sk; 500 struct pf_state *st; 501 502 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 503 RB_FOREACH(st, pf_state_tree_id, &tree_id) { 504 sk = st->key[PF_SK_WIRE]; 505 /* 506 * Kill states from this source. (Only those 507 * from the same rule if PF_FLUSH_GLOBAL is not 508 * set) 509 */ 510 if (sk->af == 511 (*state)->key[PF_SK_WIRE]->af && 512 (((*state)->direction == PF_OUT && 513 PF_AEQ(&(*state)->src_node->addr, 514 &sk->addr[0], sk->af)) || 515 ((*state)->direction == PF_IN && 516 PF_AEQ(&(*state)->src_node->addr, 517 &sk->addr[1], sk->af))) && 518 ((*state)->rule.ptr->flush & 519 PF_FLUSH_GLOBAL || 520 (*state)->rule.ptr == st->rule.ptr)) { 521 st->timeout = PFTM_PURGE; 522 st->src.state = st->dst.state = 523 TCPS_CLOSED; 524 killed++; 525 } 526 } 527 if (pf_status.debug >= PF_DEBUG_MISC) 528 kprintf(", %u states killed", killed); 529 } 530 if (pf_status.debug >= PF_DEBUG_MISC) 531 kprintf("\n"); 532 } 533 534 /* kill this state */ 535 (*state)->timeout = PFTM_PURGE; 536 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 537 return (1); 538 } 539 540 int 541 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 542 struct pf_addr *src, sa_family_t af) 543 { 544 struct pf_src_node k; 545 546 if (*sn == NULL) { 547 k.af = af; 548 PF_ACPY(&k.addr, src, af); 549 if (rule->rule_flag & PFRULE_RULESRCTRACK || 550 rule->rpool.opts & PF_POOL_STICKYADDR) 551 k.rule.ptr = rule; 552 else 553 k.rule.ptr = NULL; 554 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 555 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 556 } 557 if (*sn == NULL) { 558 if (!rule->max_src_nodes || 559 rule->src_nodes < rule->max_src_nodes) 560 (*sn) = kmalloc(sizeof(struct pf_src_node), M_PFSRCTREEPL, M_NOWAIT|M_ZERO); 561 else 562 pf_status.lcounters[LCNT_SRCNODES]++; 563 if ((*sn) == NULL) 564 return (-1); 565 566 pf_init_threshold(&(*sn)->conn_rate, 567 rule->max_src_conn_rate.limit, 568 rule->max_src_conn_rate.seconds); 569 570 (*sn)->af = af; 571 if (rule->rule_flag & PFRULE_RULESRCTRACK || 572 rule->rpool.opts & PF_POOL_STICKYADDR) 573 (*sn)->rule.ptr = rule; 574 else 575 (*sn)->rule.ptr = NULL; 576 PF_ACPY(&(*sn)->addr, src, af); 577 if (RB_INSERT(pf_src_tree, 578 &tree_src_tracking, *sn) != NULL) { 579 if (pf_status.debug >= PF_DEBUG_MISC) { 580 kprintf("pf: src_tree insert failed: "); 581 pf_print_host(&(*sn)->addr, 0, af); 582 kprintf("\n"); 583 } 584 kfree(*sn, M_PFSRCTREEPL); 585 return (-1); 586 } 587 (*sn)->creation = time_second; 588 (*sn)->ruletype = rule->action; 589 if ((*sn)->rule.ptr != NULL) 590 (*sn)->rule.ptr->src_nodes++; 591 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 592 pf_status.src_nodes++; 593 } else { 594 if (rule->max_src_states && 595 (*sn)->states >= rule->max_src_states) { 596 pf_status.lcounters[LCNT_SRCSTATES]++; 597 return (-1); 598 } 599 } 600 return (0); 601 } 602 603 /* state table stuff */ 604 605 static __inline int 606 pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b) 607 { 608 int diff; 609 610 if ((diff = a->proto - b->proto) != 0) 611 return (diff); 612 if ((diff = a->af - b->af) != 0) 613 return (diff); 614 switch (a->af) { 615 #ifdef INET 616 case AF_INET: 617 if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 618 return (1); 619 if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 620 return (-1); 621 if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 622 return (1); 623 if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 624 return (-1); 625 break; 626 #endif /* INET */ 627 #ifdef INET6 628 case AF_INET6: 629 if (a->addr[0].addr32[3] > b->addr[0].addr32[3]) 630 return (1); 631 if (a->addr[0].addr32[3] < b->addr[0].addr32[3]) 632 return (-1); 633 if (a->addr[1].addr32[3] > b->addr[1].addr32[3]) 634 return (1); 635 if (a->addr[1].addr32[3] < b->addr[1].addr32[3]) 636 return (-1); 637 if (a->addr[0].addr32[2] > b->addr[0].addr32[2]) 638 return (1); 639 if (a->addr[0].addr32[2] < b->addr[0].addr32[2]) 640 return (-1); 641 if (a->addr[1].addr32[2] > b->addr[1].addr32[2]) 642 return (1); 643 if (a->addr[1].addr32[2] < b->addr[1].addr32[2]) 644 return (-1); 645 if (a->addr[0].addr32[1] > b->addr[0].addr32[1]) 646 return (1); 647 if (a->addr[0].addr32[1] < b->addr[0].addr32[1]) 648 return (-1); 649 if (a->addr[1].addr32[1] > b->addr[1].addr32[1]) 650 return (1); 651 if (a->addr[1].addr32[1] < b->addr[1].addr32[1]) 652 return (-1); 653 if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 654 return (1); 655 if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 656 return (-1); 657 if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 658 return (1); 659 if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 660 return (-1); 661 break; 662 #endif /* INET6 */ 663 } 664 665 if ((diff = a->port[0] - b->port[0]) != 0) 666 return (diff); 667 if ((diff = a->port[1] - b->port[1]) != 0) 668 return (diff); 669 670 return (0); 671 } 672 673 static __inline int 674 pf_state_compare_id(struct pf_state *a, struct pf_state *b) 675 { 676 if (a->id > b->id) 677 return (1); 678 if (a->id < b->id) 679 return (-1); 680 if (a->creatorid > b->creatorid) 681 return (1); 682 if (a->creatorid < b->creatorid) 683 return (-1); 684 685 return (0); 686 } 687 688 int 689 pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx) 690 { 691 struct pf_state_item *si; 692 struct pf_state_key *cur; 693 694 KKASSERT(s->key[idx] == NULL); /* XXX handle this? */ 695 696 if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl, sk)) != NULL) { 697 /* key exists. check for same kif, if none, add to key */ 698 TAILQ_FOREACH(si, &cur->states, entry) 699 if (si->s->kif == s->kif && 700 si->s->direction == s->direction) { 701 if (pf_status.debug >= PF_DEBUG_MISC) { 702 kprintf( 703 "pf: %s key attach failed on %s: ", 704 (idx == PF_SK_WIRE) ? 705 "wire" : "stack", 706 s->kif->pfik_name); 707 pf_print_state_parts(s, 708 (idx == PF_SK_WIRE) ? sk : NULL, 709 (idx == PF_SK_STACK) ? sk : NULL); 710 kprintf("\n"); 711 } 712 kfree(sk, M_PFSTATEKEYPL); 713 return (-1); /* collision! */ 714 } 715 kfree(sk, M_PFSTATEKEYPL); 716 717 s->key[idx] = cur; 718 } else 719 s->key[idx] = sk; 720 721 if ((si = kmalloc(sizeof(struct pf_state_item), M_PFSTATEITEMPL, M_NOWAIT)) == NULL) { 722 pf_state_key_detach(s, idx); 723 return (-1); 724 } 725 si->s = s; 726 727 /* list is sorted, if-bound states before floating */ 728 if (s->kif == pfi_all) 729 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry); 730 else 731 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry); 732 return (0); 733 } 734 735 void 736 pf_detach_state(struct pf_state *s) 737 { 738 if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK]) 739 s->key[PF_SK_WIRE] = NULL; 740 741 if (s->key[PF_SK_STACK] != NULL) 742 pf_state_key_detach(s, PF_SK_STACK); 743 744 if (s->key[PF_SK_WIRE] != NULL) 745 pf_state_key_detach(s, PF_SK_WIRE); 746 } 747 748 void 749 pf_state_key_detach(struct pf_state *s, int idx) 750 { 751 struct pf_state_item *si; 752 si = TAILQ_FIRST(&s->key[idx]->states); 753 while (si && si->s != s) 754 si = TAILQ_NEXT(si, entry); 755 756 if (si) { 757 TAILQ_REMOVE(&s->key[idx]->states, si, entry); 758 kfree(si, M_PFSTATEITEMPL); 759 } 760 761 if (TAILQ_EMPTY(&s->key[idx]->states)) { 762 RB_REMOVE(pf_state_tree, &pf_statetbl, s->key[idx]); 763 if (s->key[idx]->reverse) 764 s->key[idx]->reverse->reverse = NULL; 765 if (s->key[idx]->inp) 766 s->key[idx]->inp->inp_pf_sk = NULL; 767 kfree(s->key[idx], M_PFSTATEKEYPL); 768 } 769 s->key[idx] = NULL; 770 } 771 772 struct pf_state_key * 773 pf_alloc_state_key(int pool_flags) 774 { 775 struct pf_state_key *sk; 776 777 if ((sk = kmalloc(sizeof(struct pf_state_key), M_PFSTATEKEYPL, pool_flags)) == NULL) 778 return (NULL); 779 TAILQ_INIT(&sk->states); 780 781 return (sk); 782 } 783 784 int 785 pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr, 786 struct pf_state_key **skw, struct pf_state_key **sks, 787 struct pf_state_key **skp, struct pf_state_key **nkp, 788 struct pf_addr *saddr, struct pf_addr *daddr, 789 u_int16_t sport, u_int16_t dport) 790 { 791 KKASSERT((*skp == NULL && *nkp == NULL)); 792 793 if ((*skp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL) 794 return (ENOMEM); 795 796 PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af); 797 PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af); 798 (*skp)->port[pd->sidx] = sport; 799 (*skp)->port[pd->didx] = dport; 800 (*skp)->proto = pd->proto; 801 (*skp)->af = pd->af; 802 803 if (nr != NULL) { 804 if ((*nkp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL) 805 return (ENOMEM); /* caller must handle cleanup */ 806 807 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */ 808 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af); 809 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af); 810 (*nkp)->port[0] = (*skp)->port[0]; 811 (*nkp)->port[1] = (*skp)->port[1]; 812 (*nkp)->proto = pd->proto; 813 (*nkp)->af = pd->af; 814 } else 815 *nkp = *skp; 816 817 if (pd->dir == PF_IN) { 818 *skw = *skp; 819 *sks = *nkp; 820 } else { 821 *sks = *skp; 822 *skw = *nkp; 823 } 824 return (0); 825 } 826 827 828 int 829 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 830 struct pf_state_key *sks, struct pf_state *s) 831 { 832 s->kif = kif; 833 834 if (skw == sks) { 835 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) 836 return (-1); 837 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 838 } else { 839 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) { 840 kfree(sks, M_PFSTATEKEYPL); 841 return (-1); 842 } 843 if (pf_state_key_attach(sks, s, PF_SK_STACK)) { 844 pf_state_key_detach(s, PF_SK_WIRE); 845 return (-1); 846 } 847 } 848 849 if (s->id == 0 && s->creatorid == 0) { 850 s->id = htobe64(pf_status.stateid++); 851 s->creatorid = pf_status.hostid; 852 } 853 854 /* 855 * Calculate hash code for altq 856 */ 857 s->hash = crc32(s->key[PF_SK_WIRE], sizeof(*sks)); 858 859 if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) { 860 if (pf_status.debug >= PF_DEBUG_MISC) { 861 kprintf("pf: state insert failed: " 862 "id: %016jx creatorid: %08x", 863 (uintmax_t)be64toh(s->id), ntohl(s->creatorid)); 864 if (s->sync_flags & PFSTATE_FROMSYNC) 865 kprintf(" (from sync)"); 866 kprintf("\n"); 867 } 868 pf_detach_state(s); 869 return (-1); 870 } 871 TAILQ_INSERT_TAIL(&state_list, s, entry_list); 872 pf_status.fcounters[FCNT_STATE_INSERT]++; 873 pf_status.states++; 874 pfi_kif_ref(kif, PFI_KIF_REF_STATE); 875 pfsync_insert_state(s); 876 return (0); 877 } 878 879 struct pf_state * 880 pf_find_state_byid(struct pf_state_cmp *key) 881 { 882 pf_status.fcounters[FCNT_STATE_SEARCH]++; 883 884 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key)); 885 } 886 887 struct pf_state * 888 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir, 889 struct mbuf *m) 890 { 891 struct pf_state_key *sk; 892 struct pf_state_item *si; 893 894 pf_status.fcounters[FCNT_STATE_SEARCH]++; 895 896 if (dir == PF_OUT && m->m_pkthdr.pf.statekey && 897 ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse) 898 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse; 899 else { 900 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl, 901 (struct pf_state_key *)key)) == NULL) 902 return (NULL); 903 if (dir == PF_OUT && m->m_pkthdr.pf.statekey) { 904 ((struct pf_state_key *) 905 m->m_pkthdr.pf.statekey)->reverse = sk; 906 sk->reverse = m->m_pkthdr.pf.statekey; 907 } 908 } 909 910 if (dir == PF_OUT) 911 m->m_pkthdr.pf.statekey = NULL; 912 913 /* list is sorted, if-bound states before floating ones */ 914 TAILQ_FOREACH(si, &sk->states, entry) 915 if ((si->s->kif == pfi_all || si->s->kif == kif) && 916 sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] : 917 si->s->key[PF_SK_STACK])) 918 return (si->s); 919 920 return (NULL); 921 } 922 923 struct pf_state * 924 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 925 { 926 struct pf_state_key *sk; 927 struct pf_state_item *si, *ret = NULL; 928 929 pf_status.fcounters[FCNT_STATE_SEARCH]++; 930 931 sk = RB_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key); 932 933 if (sk != NULL) { 934 TAILQ_FOREACH(si, &sk->states, entry) 935 if (dir == PF_INOUT || 936 (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] : 937 si->s->key[PF_SK_STACK]))) { 938 if (more == NULL) 939 return (si->s); 940 941 if (ret) 942 (*more)++; 943 else 944 ret = si; 945 } 946 } 947 return (ret ? ret->s : NULL); 948 } 949 950 /* END state table stuff */ 951 952 953 void 954 pf_purge_thread(void *v) 955 { 956 int nloops = 0; 957 int locked = 0; 958 959 lwkt_gettoken(&pf_token); 960 for (;;) { 961 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 962 963 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 964 965 if (pf_end_threads) { 966 pf_purge_expired_states(pf_status.states, 0); 967 pf_purge_expired_fragments(); 968 pf_purge_expired_src_nodes(1); 969 pf_end_threads++; 970 971 lockmgr(&pf_consistency_lock, LK_RELEASE); 972 wakeup(pf_purge_thread); 973 kthread_exit(); 974 } 975 crit_enter(); 976 977 /* process a fraction of the state table every second */ 978 if(!pf_purge_expired_states(1 + (pf_status.states 979 / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) { 980 981 pf_purge_expired_states(1 + (pf_status.states 982 / pf_default_rule.timeout[PFTM_INTERVAL]), 1); 983 } 984 985 /* purge other expired types every PFTM_INTERVAL seconds */ 986 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) { 987 pf_purge_expired_fragments(); 988 if (!pf_purge_expired_src_nodes(locked)) { 989 pf_purge_expired_src_nodes(1); 990 } 991 nloops = 0; 992 } 993 crit_exit(); 994 lockmgr(&pf_consistency_lock, LK_RELEASE); 995 } 996 lwkt_reltoken(&pf_token); 997 } 998 999 u_int32_t 1000 pf_state_expires(const struct pf_state *state) 1001 { 1002 u_int32_t timeout; 1003 u_int32_t start; 1004 u_int32_t end; 1005 u_int32_t states; 1006 1007 /* handle all PFTM_* > PFTM_MAX here */ 1008 if (state->timeout == PFTM_PURGE) 1009 return (time_second); 1010 if (state->timeout == PFTM_UNTIL_PACKET) 1011 return (0); 1012 KKASSERT(state->timeout != PFTM_UNLINKED); 1013 KKASSERT(state->timeout < PFTM_MAX); 1014 timeout = state->rule.ptr->timeout[state->timeout]; 1015 if (!timeout) 1016 timeout = pf_default_rule.timeout[state->timeout]; 1017 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1018 if (start) { 1019 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1020 states = state->rule.ptr->states_cur; 1021 } else { 1022 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1023 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1024 states = pf_status.states; 1025 } 1026 if (end && states > start && start < end) { 1027 if (states < end) 1028 return (state->expire + timeout * (end - states) / 1029 (end - start)); 1030 else 1031 return (time_second); 1032 } 1033 return (state->expire + timeout); 1034 } 1035 1036 int 1037 pf_purge_expired_src_nodes(int waslocked) 1038 { 1039 struct pf_src_node *cur, *next; 1040 int locked = waslocked; 1041 1042 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 1043 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 1044 1045 if (cur->states <= 0 && cur->expire <= time_second) { 1046 if (! locked) { 1047 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1048 next = RB_NEXT(pf_src_tree, 1049 &tree_src_tracking, cur); 1050 locked = 1; 1051 } 1052 if (cur->rule.ptr != NULL) { 1053 cur->rule.ptr->src_nodes--; 1054 if (cur->rule.ptr->states_cur <= 0 && 1055 cur->rule.ptr->max_src_nodes <= 0) 1056 pf_rm_rule(NULL, cur->rule.ptr); 1057 } 1058 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1059 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1060 pf_status.src_nodes--; 1061 kfree(cur, M_PFSRCTREEPL); 1062 } 1063 } 1064 1065 if (locked && !waslocked) 1066 lockmgr(&pf_consistency_lock, LK_RELEASE); 1067 return(1); 1068 } 1069 1070 void 1071 pf_src_tree_remove_state(struct pf_state *s) 1072 { 1073 u_int32_t timeout; 1074 1075 if (s->src_node != NULL) { 1076 if (s->src.tcp_est) 1077 --s->src_node->conn; 1078 if (--s->src_node->states <= 0) { 1079 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1080 if (!timeout) 1081 timeout = 1082 pf_default_rule.timeout[PFTM_SRC_NODE]; 1083 s->src_node->expire = time_second + timeout; 1084 } 1085 } 1086 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1087 if (--s->nat_src_node->states <= 0) { 1088 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1089 if (!timeout) 1090 timeout = 1091 pf_default_rule.timeout[PFTM_SRC_NODE]; 1092 s->nat_src_node->expire = time_second + timeout; 1093 } 1094 } 1095 s->src_node = s->nat_src_node = NULL; 1096 } 1097 1098 /* callers should be at crit_enter() */ 1099 void 1100 pf_unlink_state(struct pf_state *cur) 1101 { 1102 if (cur->src.state == PF_TCPS_PROXY_DST) { 1103 /* XXX wire key the right one? */ 1104 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af, 1105 &cur->key[PF_SK_WIRE]->addr[1], 1106 &cur->key[PF_SK_WIRE]->addr[0], 1107 cur->key[PF_SK_WIRE]->port[1], 1108 cur->key[PF_SK_WIRE]->port[0], 1109 cur->src.seqhi, cur->src.seqlo + 1, 1110 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1111 } 1112 RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1113 if (cur->creatorid == pf_status.hostid) 1114 pfsync_delete_state(cur); 1115 cur->timeout = PFTM_UNLINKED; 1116 pf_src_tree_remove_state(cur); 1117 pf_detach_state(cur); 1118 } 1119 1120 static struct pf_state *purge_cur; 1121 1122 /* callers should be at crit_enter() and hold the 1123 * write_lock on pf_consistency_lock */ 1124 void 1125 pf_free_state(struct pf_state *cur) 1126 { 1127 if (pfsyncif != NULL && 1128 (pfsyncif->sc_bulk_send_next == cur || 1129 pfsyncif->sc_bulk_terminator == cur)) 1130 return; 1131 KKASSERT(cur->timeout == PFTM_UNLINKED); 1132 if (--cur->rule.ptr->states_cur <= 0 && 1133 cur->rule.ptr->src_nodes <= 0) 1134 pf_rm_rule(NULL, cur->rule.ptr); 1135 if (cur->nat_rule.ptr != NULL) 1136 if (--cur->nat_rule.ptr->states_cur <= 0 && 1137 cur->nat_rule.ptr->src_nodes <= 0) 1138 pf_rm_rule(NULL, cur->nat_rule.ptr); 1139 if (cur->anchor.ptr != NULL) 1140 if (--cur->anchor.ptr->states_cur <= 0) 1141 pf_rm_rule(NULL, cur->anchor.ptr); 1142 pf_normalize_tcp_cleanup(cur); 1143 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE); 1144 1145 /* 1146 * We may be freeing pf_purge_expired_states()'s saved scan entry, 1147 * adjust it if necessary. 1148 */ 1149 if (purge_cur == cur) { 1150 kprintf("PURGE CONFLICT\n"); 1151 purge_cur = TAILQ_NEXT(purge_cur, entry_list); 1152 } 1153 TAILQ_REMOVE(&state_list, cur, entry_list); 1154 if (cur->tag) 1155 pf_tag_unref(cur->tag); 1156 kfree(cur, M_PFSTATEPL); 1157 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1158 pf_status.states--; 1159 } 1160 1161 int 1162 pf_purge_expired_states(u_int32_t maxcheck, int waslocked) 1163 { 1164 struct pf_state *cur; 1165 int locked = waslocked; 1166 1167 while (maxcheck--) { 1168 /* 1169 * Wrap to start of list when we hit the end 1170 */ 1171 cur = purge_cur; 1172 if (cur == NULL) { 1173 cur = TAILQ_FIRST(&state_list); 1174 if (cur == NULL) 1175 break; /* list empty */ 1176 } 1177 1178 /* 1179 * Setup next (purge_cur) while we process this one. If we block and 1180 * something else deletes purge_cur, pf_free_state() will adjust it further 1181 * ahead. 1182 */ 1183 purge_cur = TAILQ_NEXT(cur, entry_list); 1184 1185 if (cur->timeout == PFTM_UNLINKED) { 1186 /* free unlinked state */ 1187 if (! locked) { 1188 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE); 1189 locked = 1; 1190 } 1191 pf_free_state(cur); 1192 } else if (pf_state_expires(cur) <= time_second) { 1193 /* unlink and free expired state */ 1194 pf_unlink_state(cur); 1195 if (! locked) { 1196 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE)) 1197 return (0); 1198 locked = 1; 1199 } 1200 pf_free_state(cur); 1201 } 1202 } 1203 1204 if (locked) 1205 lockmgr(&pf_consistency_lock, LK_RELEASE); 1206 return (1); 1207 } 1208 1209 int 1210 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1211 { 1212 if (aw->type != PF_ADDR_TABLE) 1213 return (0); 1214 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1215 return (1); 1216 return (0); 1217 } 1218 1219 void 1220 pf_tbladdr_remove(struct pf_addr_wrap *aw) 1221 { 1222 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1223 return; 1224 pfr_detach_table(aw->p.tbl); 1225 aw->p.tbl = NULL; 1226 } 1227 1228 void 1229 pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1230 { 1231 struct pfr_ktable *kt = aw->p.tbl; 1232 1233 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1234 return; 1235 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1236 kt = kt->pfrkt_root; 1237 aw->p.tbl = NULL; 1238 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1239 kt->pfrkt_cnt : -1; 1240 } 1241 1242 void 1243 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1244 { 1245 switch (af) { 1246 #ifdef INET 1247 case AF_INET: { 1248 u_int32_t a = ntohl(addr->addr32[0]); 1249 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1250 (a>>8)&255, a&255); 1251 if (p) { 1252 p = ntohs(p); 1253 kprintf(":%u", p); 1254 } 1255 break; 1256 } 1257 #endif /* INET */ 1258 #ifdef INET6 1259 case AF_INET6: { 1260 u_int16_t b; 1261 u_int8_t i, curstart = 255, curend = 0, 1262 maxstart = 0, maxend = 0; 1263 for (i = 0; i < 8; i++) { 1264 if (!addr->addr16[i]) { 1265 if (curstart == 255) 1266 curstart = i; 1267 else 1268 curend = i; 1269 } else { 1270 if (curstart) { 1271 if ((curend - curstart) > 1272 (maxend - maxstart)) { 1273 maxstart = curstart; 1274 maxend = curend; 1275 curstart = 255; 1276 } 1277 } 1278 } 1279 } 1280 for (i = 0; i < 8; i++) { 1281 if (i >= maxstart && i <= maxend) { 1282 if (maxend != 7) { 1283 if (i == maxstart) 1284 kprintf(":"); 1285 } else { 1286 if (i == maxend) 1287 kprintf(":"); 1288 } 1289 } else { 1290 b = ntohs(addr->addr16[i]); 1291 kprintf("%x", b); 1292 if (i < 7) 1293 kprintf(":"); 1294 } 1295 } 1296 if (p) { 1297 p = ntohs(p); 1298 kprintf("[%u]", p); 1299 } 1300 break; 1301 } 1302 #endif /* INET6 */ 1303 } 1304 } 1305 1306 void 1307 pf_print_state(struct pf_state *s) 1308 { 1309 pf_print_state_parts(s, NULL, NULL); 1310 } 1311 1312 void 1313 pf_print_state_parts(struct pf_state *s, 1314 struct pf_state_key *skwp, struct pf_state_key *sksp) 1315 { 1316 struct pf_state_key *skw, *sks; 1317 u_int8_t proto, dir; 1318 1319 /* Do our best to fill these, but they're skipped if NULL */ 1320 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1321 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1322 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1323 dir = s ? s->direction : 0; 1324 1325 switch (proto) { 1326 case IPPROTO_TCP: 1327 kprintf("TCP "); 1328 break; 1329 case IPPROTO_UDP: 1330 kprintf("UDP "); 1331 break; 1332 case IPPROTO_ICMP: 1333 kprintf("ICMP "); 1334 break; 1335 case IPPROTO_ICMPV6: 1336 kprintf("ICMPV6 "); 1337 break; 1338 default: 1339 kprintf("%u ", skw->proto); 1340 break; 1341 } 1342 switch (dir) { 1343 case PF_IN: 1344 kprintf(" in"); 1345 break; 1346 case PF_OUT: 1347 kprintf(" out"); 1348 break; 1349 } 1350 if (skw) { 1351 kprintf(" wire: "); 1352 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1353 kprintf(" "); 1354 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1355 } 1356 if (sks) { 1357 kprintf(" stack: "); 1358 if (sks != skw) { 1359 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1360 kprintf(" "); 1361 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1362 } else 1363 kprintf("-"); 1364 } 1365 if (s) { 1366 if (proto == IPPROTO_TCP) { 1367 kprintf(" [lo=%u high=%u win=%u modulator=%u", 1368 s->src.seqlo, s->src.seqhi, 1369 s->src.max_win, s->src.seqdiff); 1370 if (s->src.wscale && s->dst.wscale) 1371 kprintf(" wscale=%u", 1372 s->src.wscale & PF_WSCALE_MASK); 1373 kprintf("]"); 1374 kprintf(" [lo=%u high=%u win=%u modulator=%u", 1375 s->dst.seqlo, s->dst.seqhi, 1376 s->dst.max_win, s->dst.seqdiff); 1377 if (s->src.wscale && s->dst.wscale) 1378 kprintf(" wscale=%u", 1379 s->dst.wscale & PF_WSCALE_MASK); 1380 kprintf("]"); 1381 } 1382 kprintf(" %u:%u", s->src.state, s->dst.state); 1383 } 1384 } 1385 1386 void 1387 pf_print_flags(u_int8_t f) 1388 { 1389 if (f) 1390 kprintf(" "); 1391 if (f & TH_FIN) 1392 kprintf("F"); 1393 if (f & TH_SYN) 1394 kprintf("S"); 1395 if (f & TH_RST) 1396 kprintf("R"); 1397 if (f & TH_PUSH) 1398 kprintf("P"); 1399 if (f & TH_ACK) 1400 kprintf("A"); 1401 if (f & TH_URG) 1402 kprintf("U"); 1403 if (f & TH_ECE) 1404 kprintf("E"); 1405 if (f & TH_CWR) 1406 kprintf("W"); 1407 } 1408 1409 #define PF_SET_SKIP_STEPS(i) \ 1410 do { \ 1411 while (head[i] != cur) { \ 1412 head[i]->skip[i].ptr = cur; \ 1413 head[i] = TAILQ_NEXT(head[i], entries); \ 1414 } \ 1415 } while (0) 1416 1417 void 1418 pf_calc_skip_steps(struct pf_rulequeue *rules) 1419 { 1420 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1421 int i; 1422 1423 cur = TAILQ_FIRST(rules); 1424 prev = cur; 1425 for (i = 0; i < PF_SKIP_COUNT; ++i) 1426 head[i] = cur; 1427 while (cur != NULL) { 1428 1429 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1430 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1431 if (cur->direction != prev->direction) 1432 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1433 if (cur->af != prev->af) 1434 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1435 if (cur->proto != prev->proto) 1436 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1437 if (cur->src.neg != prev->src.neg || 1438 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1439 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1440 if (cur->src.port[0] != prev->src.port[0] || 1441 cur->src.port[1] != prev->src.port[1] || 1442 cur->src.port_op != prev->src.port_op) 1443 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1444 if (cur->dst.neg != prev->dst.neg || 1445 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1446 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1447 if (cur->dst.port[0] != prev->dst.port[0] || 1448 cur->dst.port[1] != prev->dst.port[1] || 1449 cur->dst.port_op != prev->dst.port_op) 1450 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1451 1452 prev = cur; 1453 cur = TAILQ_NEXT(cur, entries); 1454 } 1455 for (i = 0; i < PF_SKIP_COUNT; ++i) 1456 PF_SET_SKIP_STEPS(i); 1457 } 1458 1459 int 1460 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1461 { 1462 if (aw1->type != aw2->type) 1463 return (1); 1464 switch (aw1->type) { 1465 case PF_ADDR_ADDRMASK: 1466 case PF_ADDR_RANGE: 1467 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1468 return (1); 1469 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1470 return (1); 1471 return (0); 1472 case PF_ADDR_DYNIFTL: 1473 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1474 case PF_ADDR_NOROUTE: 1475 case PF_ADDR_URPFFAILED: 1476 return (0); 1477 case PF_ADDR_TABLE: 1478 return (aw1->p.tbl != aw2->p.tbl); 1479 case PF_ADDR_RTLABEL: 1480 return (aw1->v.rtlabel != aw2->v.rtlabel); 1481 default: 1482 kprintf("invalid address type: %d\n", aw1->type); 1483 return (1); 1484 } 1485 } 1486 1487 u_int16_t 1488 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1489 { 1490 u_int32_t l; 1491 1492 if (udp && !cksum) 1493 return (0x0000); 1494 l = cksum + old - new; 1495 l = (l >> 16) + (l & 65535); 1496 l = l & 65535; 1497 if (udp && !l) 1498 return (0xFFFF); 1499 return (l); 1500 } 1501 1502 void 1503 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1504 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1505 { 1506 struct pf_addr ao; 1507 u_int16_t po = *p; 1508 1509 PF_ACPY(&ao, a, af); 1510 PF_ACPY(a, an, af); 1511 1512 *p = pn; 1513 1514 switch (af) { 1515 #ifdef INET 1516 case AF_INET: 1517 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1518 ao.addr16[0], an->addr16[0], 0), 1519 ao.addr16[1], an->addr16[1], 0); 1520 *p = pn; 1521 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1522 ao.addr16[0], an->addr16[0], u), 1523 ao.addr16[1], an->addr16[1], u), 1524 po, pn, u); 1525 break; 1526 #endif /* INET */ 1527 #ifdef INET6 1528 case AF_INET6: 1529 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1530 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1531 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1532 ao.addr16[0], an->addr16[0], u), 1533 ao.addr16[1], an->addr16[1], u), 1534 ao.addr16[2], an->addr16[2], u), 1535 ao.addr16[3], an->addr16[3], u), 1536 ao.addr16[4], an->addr16[4], u), 1537 ao.addr16[5], an->addr16[5], u), 1538 ao.addr16[6], an->addr16[6], u), 1539 ao.addr16[7], an->addr16[7], u), 1540 po, pn, u); 1541 break; 1542 #endif /* INET6 */ 1543 } 1544 } 1545 1546 1547 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1548 void 1549 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1550 { 1551 u_int32_t ao; 1552 1553 memcpy(&ao, a, sizeof(ao)); 1554 memcpy(a, &an, sizeof(u_int32_t)); 1555 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1556 ao % 65536, an % 65536, u); 1557 } 1558 1559 #ifdef INET6 1560 void 1561 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1562 { 1563 struct pf_addr ao; 1564 1565 PF_ACPY(&ao, a, AF_INET6); 1566 PF_ACPY(a, an, AF_INET6); 1567 1568 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1569 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1570 pf_cksum_fixup(pf_cksum_fixup(*c, 1571 ao.addr16[0], an->addr16[0], u), 1572 ao.addr16[1], an->addr16[1], u), 1573 ao.addr16[2], an->addr16[2], u), 1574 ao.addr16[3], an->addr16[3], u), 1575 ao.addr16[4], an->addr16[4], u), 1576 ao.addr16[5], an->addr16[5], u), 1577 ao.addr16[6], an->addr16[6], u), 1578 ao.addr16[7], an->addr16[7], u); 1579 } 1580 #endif /* INET6 */ 1581 1582 void 1583 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1584 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1585 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1586 { 1587 struct pf_addr oia, ooa; 1588 1589 PF_ACPY(&oia, ia, af); 1590 if (oa) 1591 PF_ACPY(&ooa, oa, af); 1592 1593 /* Change inner protocol port, fix inner protocol checksum. */ 1594 if (ip != NULL) { 1595 u_int16_t oip = *ip; 1596 u_int32_t opc = 0; 1597 1598 if (pc != NULL) 1599 opc = *pc; 1600 *ip = np; 1601 if (pc != NULL) 1602 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1603 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1604 if (pc != NULL) 1605 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1606 } 1607 /* Change inner ip address, fix inner ip and icmp checksums. */ 1608 PF_ACPY(ia, na, af); 1609 switch (af) { 1610 #ifdef INET 1611 case AF_INET: { 1612 u_int32_t oh2c = *h2c; 1613 1614 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1615 oia.addr16[0], ia->addr16[0], 0), 1616 oia.addr16[1], ia->addr16[1], 0); 1617 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1618 oia.addr16[0], ia->addr16[0], 0), 1619 oia.addr16[1], ia->addr16[1], 0); 1620 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1621 break; 1622 } 1623 #endif /* INET */ 1624 #ifdef INET6 1625 case AF_INET6: 1626 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1627 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1628 pf_cksum_fixup(pf_cksum_fixup(*ic, 1629 oia.addr16[0], ia->addr16[0], u), 1630 oia.addr16[1], ia->addr16[1], u), 1631 oia.addr16[2], ia->addr16[2], u), 1632 oia.addr16[3], ia->addr16[3], u), 1633 oia.addr16[4], ia->addr16[4], u), 1634 oia.addr16[5], ia->addr16[5], u), 1635 oia.addr16[6], ia->addr16[6], u), 1636 oia.addr16[7], ia->addr16[7], u); 1637 break; 1638 #endif /* INET6 */ 1639 } 1640 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 1641 if (oa) { 1642 PF_ACPY(oa, na, af); 1643 switch (af) { 1644 #ifdef INET 1645 case AF_INET: 1646 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1647 ooa.addr16[0], oa->addr16[0], 0), 1648 ooa.addr16[1], oa->addr16[1], 0); 1649 break; 1650 #endif /* INET */ 1651 #ifdef INET6 1652 case AF_INET6: 1653 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1654 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1655 pf_cksum_fixup(pf_cksum_fixup(*ic, 1656 ooa.addr16[0], oa->addr16[0], u), 1657 ooa.addr16[1], oa->addr16[1], u), 1658 ooa.addr16[2], oa->addr16[2], u), 1659 ooa.addr16[3], oa->addr16[3], u), 1660 ooa.addr16[4], oa->addr16[4], u), 1661 ooa.addr16[5], oa->addr16[5], u), 1662 ooa.addr16[6], oa->addr16[6], u), 1663 ooa.addr16[7], oa->addr16[7], u); 1664 break; 1665 #endif /* INET6 */ 1666 } 1667 } 1668 } 1669 1670 1671 /* 1672 * Need to modulate the sequence numbers in the TCP SACK option 1673 * (credits to Krzysztof Pfaff for report and patch) 1674 */ 1675 int 1676 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 1677 struct tcphdr *th, struct pf_state_peer *dst) 1678 { 1679 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 1680 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 1681 int copyback = 0, i, olen; 1682 struct raw_sackblock sack; 1683 1684 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 1685 if (hlen < TCPOLEN_SACKLEN || 1686 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 1687 return 0; 1688 1689 while (hlen >= TCPOLEN_SACKLEN) { 1690 olen = opt[1]; 1691 switch (*opt) { 1692 case TCPOPT_EOL: /* FALLTHROUGH */ 1693 case TCPOPT_NOP: 1694 opt++; 1695 hlen--; 1696 break; 1697 case TCPOPT_SACK: 1698 if (olen > hlen) 1699 olen = hlen; 1700 if (olen >= TCPOLEN_SACKLEN) { 1701 for (i = 2; i + TCPOLEN_SACK <= olen; 1702 i += TCPOLEN_SACK) { 1703 memcpy(&sack, &opt[i], sizeof(sack)); 1704 pf_change_a(&sack.rblk_start, &th->th_sum, 1705 htonl(ntohl(sack.rblk_start) - 1706 dst->seqdiff), 0); 1707 pf_change_a(&sack.rblk_end, &th->th_sum, 1708 htonl(ntohl(sack.rblk_end) - 1709 dst->seqdiff), 0); 1710 memcpy(&opt[i], &sack, sizeof(sack)); 1711 } 1712 copyback = 1; 1713 } 1714 /* FALLTHROUGH */ 1715 default: 1716 if (olen < 2) 1717 olen = 2; 1718 hlen -= olen; 1719 opt += olen; 1720 } 1721 } 1722 1723 if (copyback) 1724 m_copyback(m, off + sizeof(*th), thoptlen, opts); 1725 return (copyback); 1726 } 1727 1728 void 1729 pf_send_tcp(const struct pf_rule *r, sa_family_t af, 1730 const struct pf_addr *saddr, const struct pf_addr *daddr, 1731 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1732 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1733 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 1734 { 1735 struct mbuf *m; 1736 int len = 0, tlen; 1737 #ifdef INET 1738 struct ip *h = NULL; 1739 #endif /* INET */ 1740 #ifdef INET6 1741 struct ip6_hdr *h6 = NULL; 1742 #endif /* INET6 */ 1743 struct tcphdr *th = NULL; 1744 char *opt; 1745 1746 ASSERT_LWKT_TOKEN_HELD(&pf_token); 1747 1748 /* maximum segment size tcp option */ 1749 tlen = sizeof(struct tcphdr); 1750 if (mss) 1751 tlen += 4; 1752 1753 switch (af) { 1754 #ifdef INET 1755 case AF_INET: 1756 len = sizeof(struct ip) + tlen; 1757 break; 1758 #endif /* INET */ 1759 #ifdef INET6 1760 case AF_INET6: 1761 len = sizeof(struct ip6_hdr) + tlen; 1762 break; 1763 #endif /* INET6 */ 1764 } 1765 1766 /* 1767 * Create outgoing mbuf. 1768 * 1769 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 1770 * so make sure pf.flags is clear. 1771 */ 1772 m = m_gethdr(MB_DONTWAIT, MT_HEADER); 1773 if (m == NULL) { 1774 return; 1775 } 1776 if (tag) 1777 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 1778 m->m_pkthdr.pf.flags = 0; 1779 m->m_pkthdr.pf.tag = rtag; 1780 /* XXX Recheck when upgrading to > 4.4 */ 1781 m->m_pkthdr.pf.statekey = NULL; 1782 if (r != NULL && r->rtableid >= 0) 1783 m->m_pkthdr.pf.rtableid = r->rtableid; 1784 1785 #ifdef ALTQ 1786 if (r != NULL && r->qid) { 1787 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 1788 m->m_pkthdr.pf.qid = r->qid; 1789 m->m_pkthdr.pf.ecn_af = af; 1790 m->m_pkthdr.pf.hdr = mtod(m, struct ip *); 1791 } 1792 #endif /* ALTQ */ 1793 m->m_data += max_linkhdr; 1794 m->m_pkthdr.len = m->m_len = len; 1795 m->m_pkthdr.rcvif = NULL; 1796 bzero(m->m_data, len); 1797 switch (af) { 1798 #ifdef INET 1799 case AF_INET: 1800 h = mtod(m, struct ip *); 1801 1802 /* IP header fields included in the TCP checksum */ 1803 h->ip_p = IPPROTO_TCP; 1804 h->ip_len = tlen; 1805 h->ip_src.s_addr = saddr->v4.s_addr; 1806 h->ip_dst.s_addr = daddr->v4.s_addr; 1807 1808 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1809 break; 1810 #endif /* INET */ 1811 #ifdef INET6 1812 case AF_INET6: 1813 h6 = mtod(m, struct ip6_hdr *); 1814 1815 /* IP header fields included in the TCP checksum */ 1816 h6->ip6_nxt = IPPROTO_TCP; 1817 h6->ip6_plen = htons(tlen); 1818 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1819 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1820 1821 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1822 break; 1823 #endif /* INET6 */ 1824 } 1825 1826 /* TCP header */ 1827 th->th_sport = sport; 1828 th->th_dport = dport; 1829 th->th_seq = htonl(seq); 1830 th->th_ack = htonl(ack); 1831 th->th_off = tlen >> 2; 1832 th->th_flags = flags; 1833 th->th_win = htons(win); 1834 1835 if (mss) { 1836 opt = (char *)(th + 1); 1837 opt[0] = TCPOPT_MAXSEG; 1838 opt[1] = 4; 1839 mss = htons(mss); 1840 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1841 } 1842 1843 switch (af) { 1844 #ifdef INET 1845 case AF_INET: 1846 /* TCP checksum */ 1847 th->th_sum = in_cksum(m, len); 1848 1849 /* Finish the IP header */ 1850 h->ip_v = 4; 1851 h->ip_hl = sizeof(*h) >> 2; 1852 h->ip_tos = IPTOS_LOWDELAY; 1853 h->ip_len = len; 1854 h->ip_off = path_mtu_discovery ? IP_DF : 0; 1855 h->ip_ttl = ttl ? ttl : ip_defttl; 1856 h->ip_sum = 0; 1857 if (eh == NULL) { 1858 lwkt_reltoken(&pf_token); 1859 ip_output(m, NULL, NULL, 0, NULL, NULL); 1860 lwkt_gettoken(&pf_token); 1861 } else { 1862 struct route ro; 1863 struct rtentry rt; 1864 struct ether_header *e = (void *)ro.ro_dst.sa_data; 1865 1866 if (ifp == NULL) { 1867 m_freem(m); 1868 return; 1869 } 1870 rt.rt_ifp = ifp; 1871 ro.ro_rt = &rt; 1872 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1873 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1874 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1875 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 1876 e->ether_type = eh->ether_type; 1877 /* XXX_IMPORT: later */ 1878 lwkt_reltoken(&pf_token); 1879 ip_output(m, NULL, &ro, 0, NULL, NULL); 1880 lwkt_gettoken(&pf_token); 1881 } 1882 break; 1883 #endif /* INET */ 1884 #ifdef INET6 1885 case AF_INET6: 1886 /* TCP checksum */ 1887 th->th_sum = in6_cksum(m, IPPROTO_TCP, 1888 sizeof(struct ip6_hdr), tlen); 1889 1890 h6->ip6_vfc |= IPV6_VERSION; 1891 h6->ip6_hlim = IPV6_DEFHLIM; 1892 1893 lwkt_reltoken(&pf_token); 1894 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 1895 lwkt_gettoken(&pf_token); 1896 break; 1897 #endif /* INET6 */ 1898 } 1899 } 1900 1901 void 1902 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 1903 struct pf_rule *r) 1904 { 1905 struct mbuf *m0; 1906 1907 /* 1908 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 1909 * so make sure pf.flags is clear. 1910 */ 1911 if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL) 1912 return; 1913 1914 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 1915 m0->m_pkthdr.pf.flags = 0; 1916 /* XXX Re-Check when Upgrading to > 4.4 */ 1917 m0->m_pkthdr.pf.statekey = NULL; 1918 1919 if (r->rtableid >= 0) 1920 m0->m_pkthdr.pf.rtableid = r->rtableid; 1921 1922 #ifdef ALTQ 1923 if (r->qid) { 1924 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 1925 m0->m_pkthdr.pf.qid = r->qid; 1926 m0->m_pkthdr.pf.ecn_af = af; 1927 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *); 1928 } 1929 #endif /* ALTQ */ 1930 1931 switch (af) { 1932 #ifdef INET 1933 case AF_INET: 1934 icmp_error(m0, type, code, 0, 0); 1935 break; 1936 #endif /* INET */ 1937 #ifdef INET6 1938 case AF_INET6: 1939 icmp6_error(m0, type, code, 0); 1940 break; 1941 #endif /* INET6 */ 1942 } 1943 } 1944 1945 /* 1946 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 1947 * If n is 0, they match if they are equal. If n is != 0, they match if they 1948 * are different. 1949 */ 1950 int 1951 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 1952 struct pf_addr *b, sa_family_t af) 1953 { 1954 int match = 0; 1955 1956 switch (af) { 1957 #ifdef INET 1958 case AF_INET: 1959 if ((a->addr32[0] & m->addr32[0]) == 1960 (b->addr32[0] & m->addr32[0])) 1961 match++; 1962 break; 1963 #endif /* INET */ 1964 #ifdef INET6 1965 case AF_INET6: 1966 if (((a->addr32[0] & m->addr32[0]) == 1967 (b->addr32[0] & m->addr32[0])) && 1968 ((a->addr32[1] & m->addr32[1]) == 1969 (b->addr32[1] & m->addr32[1])) && 1970 ((a->addr32[2] & m->addr32[2]) == 1971 (b->addr32[2] & m->addr32[2])) && 1972 ((a->addr32[3] & m->addr32[3]) == 1973 (b->addr32[3] & m->addr32[3]))) 1974 match++; 1975 break; 1976 #endif /* INET6 */ 1977 } 1978 if (match) { 1979 if (n) 1980 return (0); 1981 else 1982 return (1); 1983 } else { 1984 if (n) 1985 return (1); 1986 else 1987 return (0); 1988 } 1989 } 1990 1991 /* 1992 * Return 1 if b <= a <= e, otherwise return 0. 1993 */ 1994 int 1995 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 1996 struct pf_addr *a, sa_family_t af) 1997 { 1998 switch (af) { 1999 #ifdef INET 2000 case AF_INET: 2001 if ((a->addr32[0] < b->addr32[0]) || 2002 (a->addr32[0] > e->addr32[0])) 2003 return (0); 2004 break; 2005 #endif /* INET */ 2006 #ifdef INET6 2007 case AF_INET6: { 2008 int i; 2009 2010 /* check a >= b */ 2011 for (i = 0; i < 4; ++i) 2012 if (a->addr32[i] > b->addr32[i]) 2013 break; 2014 else if (a->addr32[i] < b->addr32[i]) 2015 return (0); 2016 /* check a <= e */ 2017 for (i = 0; i < 4; ++i) 2018 if (a->addr32[i] < e->addr32[i]) 2019 break; 2020 else if (a->addr32[i] > e->addr32[i]) 2021 return (0); 2022 break; 2023 } 2024 #endif /* INET6 */ 2025 } 2026 return (1); 2027 } 2028 2029 int 2030 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2031 { 2032 switch (op) { 2033 case PF_OP_IRG: 2034 return ((p > a1) && (p < a2)); 2035 case PF_OP_XRG: 2036 return ((p < a1) || (p > a2)); 2037 case PF_OP_RRG: 2038 return ((p >= a1) && (p <= a2)); 2039 case PF_OP_EQ: 2040 return (p == a1); 2041 case PF_OP_NE: 2042 return (p != a1); 2043 case PF_OP_LT: 2044 return (p < a1); 2045 case PF_OP_LE: 2046 return (p <= a1); 2047 case PF_OP_GT: 2048 return (p > a1); 2049 case PF_OP_GE: 2050 return (p >= a1); 2051 } 2052 return (0); /* never reached */ 2053 } 2054 2055 int 2056 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2057 { 2058 a1 = ntohs(a1); 2059 a2 = ntohs(a2); 2060 p = ntohs(p); 2061 return (pf_match(op, a1, a2, p)); 2062 } 2063 2064 int 2065 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2066 { 2067 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2068 return (0); 2069 return (pf_match(op, a1, a2, u)); 2070 } 2071 2072 int 2073 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2074 { 2075 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2076 return (0); 2077 return (pf_match(op, a1, a2, g)); 2078 } 2079 2080 int 2081 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag) 2082 { 2083 if (*tag == -1) 2084 *tag = m->m_pkthdr.pf.tag; 2085 2086 return ((!r->match_tag_not && r->match_tag == *tag) || 2087 (r->match_tag_not && r->match_tag != *tag)); 2088 } 2089 2090 int 2091 pf_tag_packet(struct mbuf *m, int tag, int rtableid) 2092 { 2093 if (tag <= 0 && rtableid < 0) 2094 return (0); 2095 2096 if (tag > 0) 2097 m->m_pkthdr.pf.tag = tag; 2098 if (rtableid >= 0) 2099 m->m_pkthdr.pf.rtableid = rtableid; 2100 2101 return (0); 2102 } 2103 2104 void 2105 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2106 struct pf_rule **r, struct pf_rule **a, int *match) 2107 { 2108 struct pf_anchor_stackframe *f; 2109 2110 (*r)->anchor->match = 0; 2111 if (match) 2112 *match = 0; 2113 if (*depth >= NELEM(pf_anchor_stack)) { 2114 kprintf("pf_step_into_anchor: stack overflow\n"); 2115 *r = TAILQ_NEXT(*r, entries); 2116 return; 2117 } else if (*depth == 0 && a != NULL) 2118 *a = *r; 2119 f = pf_anchor_stack + (*depth)++; 2120 f->rs = *rs; 2121 f->r = *r; 2122 if ((*r)->anchor_wildcard) { 2123 f->parent = &(*r)->anchor->children; 2124 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2125 NULL) { 2126 *r = NULL; 2127 return; 2128 } 2129 *rs = &f->child->ruleset; 2130 } else { 2131 f->parent = NULL; 2132 f->child = NULL; 2133 *rs = &(*r)->anchor->ruleset; 2134 } 2135 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2136 } 2137 2138 int 2139 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2140 struct pf_rule **r, struct pf_rule **a, int *match) 2141 { 2142 struct pf_anchor_stackframe *f; 2143 int quick = 0; 2144 2145 do { 2146 if (*depth <= 0) 2147 break; 2148 f = pf_anchor_stack + *depth - 1; 2149 if (f->parent != NULL && f->child != NULL) { 2150 if (f->child->match || 2151 (match != NULL && *match)) { 2152 f->r->anchor->match = 1; 2153 *match = 0; 2154 } 2155 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2156 if (f->child != NULL) { 2157 *rs = &f->child->ruleset; 2158 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2159 if (*r == NULL) 2160 continue; 2161 else 2162 break; 2163 } 2164 } 2165 (*depth)--; 2166 if (*depth == 0 && a != NULL) 2167 *a = NULL; 2168 *rs = f->rs; 2169 if (f->r->anchor->match || (match != NULL && *match)) 2170 quick = f->r->quick; 2171 *r = TAILQ_NEXT(f->r, entries); 2172 } while (*r == NULL); 2173 2174 return (quick); 2175 } 2176 2177 #ifdef INET6 2178 void 2179 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2180 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2181 { 2182 switch (af) { 2183 #ifdef INET 2184 case AF_INET: 2185 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2186 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2187 break; 2188 #endif /* INET */ 2189 case AF_INET6: 2190 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2191 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2192 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2193 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2194 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2195 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2196 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2197 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2198 break; 2199 } 2200 } 2201 2202 void 2203 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2204 { 2205 switch (af) { 2206 #ifdef INET 2207 case AF_INET: 2208 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2209 break; 2210 #endif /* INET */ 2211 case AF_INET6: 2212 if (addr->addr32[3] == 0xffffffff) { 2213 addr->addr32[3] = 0; 2214 if (addr->addr32[2] == 0xffffffff) { 2215 addr->addr32[2] = 0; 2216 if (addr->addr32[1] == 0xffffffff) { 2217 addr->addr32[1] = 0; 2218 addr->addr32[0] = 2219 htonl(ntohl(addr->addr32[0]) + 1); 2220 } else 2221 addr->addr32[1] = 2222 htonl(ntohl(addr->addr32[1]) + 1); 2223 } else 2224 addr->addr32[2] = 2225 htonl(ntohl(addr->addr32[2]) + 1); 2226 } else 2227 addr->addr32[3] = 2228 htonl(ntohl(addr->addr32[3]) + 1); 2229 break; 2230 } 2231 } 2232 #endif /* INET6 */ 2233 2234 #define mix(a,b,c) \ 2235 do { \ 2236 a -= b; a -= c; a ^= (c >> 13); \ 2237 b -= c; b -= a; b ^= (a << 8); \ 2238 c -= a; c -= b; c ^= (b >> 13); \ 2239 a -= b; a -= c; a ^= (c >> 12); \ 2240 b -= c; b -= a; b ^= (a << 16); \ 2241 c -= a; c -= b; c ^= (b >> 5); \ 2242 a -= b; a -= c; a ^= (c >> 3); \ 2243 b -= c; b -= a; b ^= (a << 10); \ 2244 c -= a; c -= b; c ^= (b >> 15); \ 2245 } while (0) 2246 2247 /* 2248 * hash function based on bridge_hash in if_bridge.c 2249 */ 2250 void 2251 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2252 struct pf_poolhashkey *key, sa_family_t af) 2253 { 2254 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2255 2256 switch (af) { 2257 #ifdef INET 2258 case AF_INET: 2259 a += inaddr->addr32[0]; 2260 b += key->key32[1]; 2261 mix(a, b, c); 2262 hash->addr32[0] = c + key->key32[2]; 2263 break; 2264 #endif /* INET */ 2265 #ifdef INET6 2266 case AF_INET6: 2267 a += inaddr->addr32[0]; 2268 b += inaddr->addr32[2]; 2269 mix(a, b, c); 2270 hash->addr32[0] = c; 2271 a += inaddr->addr32[1]; 2272 b += inaddr->addr32[3]; 2273 c += key->key32[1]; 2274 mix(a, b, c); 2275 hash->addr32[1] = c; 2276 a += inaddr->addr32[2]; 2277 b += inaddr->addr32[1]; 2278 c += key->key32[2]; 2279 mix(a, b, c); 2280 hash->addr32[2] = c; 2281 a += inaddr->addr32[3]; 2282 b += inaddr->addr32[0]; 2283 c += key->key32[3]; 2284 mix(a, b, c); 2285 hash->addr32[3] = c; 2286 break; 2287 #endif /* INET6 */ 2288 } 2289 } 2290 2291 int 2292 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2293 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2294 { 2295 unsigned char hash[16]; 2296 struct pf_pool *rpool = &r->rpool; 2297 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2298 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2299 struct pf_pooladdr *acur = rpool->cur; 2300 struct pf_src_node k; 2301 2302 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2303 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2304 k.af = af; 2305 PF_ACPY(&k.addr, saddr, af); 2306 if (r->rule_flag & PFRULE_RULESRCTRACK || 2307 r->rpool.opts & PF_POOL_STICKYADDR) 2308 k.rule.ptr = r; 2309 else 2310 k.rule.ptr = NULL; 2311 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2312 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2313 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2314 PF_ACPY(naddr, &(*sn)->raddr, af); 2315 if (pf_status.debug >= PF_DEBUG_MISC) { 2316 kprintf("pf_map_addr: src tracking maps "); 2317 pf_print_host(&k.addr, 0, af); 2318 kprintf(" to "); 2319 pf_print_host(naddr, 0, af); 2320 kprintf("\n"); 2321 } 2322 return (0); 2323 } 2324 } 2325 2326 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2327 return (1); 2328 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2329 switch (af) { 2330 #ifdef INET 2331 case AF_INET: 2332 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2333 (rpool->opts & PF_POOL_TYPEMASK) != 2334 PF_POOL_ROUNDROBIN) 2335 return (1); 2336 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2337 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2338 break; 2339 #endif /* INET */ 2340 #ifdef INET6 2341 case AF_INET6: 2342 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2343 (rpool->opts & PF_POOL_TYPEMASK) != 2344 PF_POOL_ROUNDROBIN) 2345 return (1); 2346 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2347 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2348 break; 2349 #endif /* INET6 */ 2350 } 2351 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2352 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2353 return (1); /* unsupported */ 2354 } else { 2355 raddr = &rpool->cur->addr.v.a.addr; 2356 rmask = &rpool->cur->addr.v.a.mask; 2357 } 2358 2359 switch (rpool->opts & PF_POOL_TYPEMASK) { 2360 case PF_POOL_NONE: 2361 PF_ACPY(naddr, raddr, af); 2362 break; 2363 case PF_POOL_BITMASK: 2364 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2365 break; 2366 case PF_POOL_RANDOM: 2367 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2368 switch (af) { 2369 #ifdef INET 2370 case AF_INET: 2371 rpool->counter.addr32[0] = htonl(karc4random()); 2372 break; 2373 #endif /* INET */ 2374 #ifdef INET6 2375 case AF_INET6: 2376 if (rmask->addr32[3] != 0xffffffff) 2377 rpool->counter.addr32[3] = 2378 htonl(karc4random()); 2379 else 2380 break; 2381 if (rmask->addr32[2] != 0xffffffff) 2382 rpool->counter.addr32[2] = 2383 htonl(karc4random()); 2384 else 2385 break; 2386 if (rmask->addr32[1] != 0xffffffff) 2387 rpool->counter.addr32[1] = 2388 htonl(karc4random()); 2389 else 2390 break; 2391 if (rmask->addr32[0] != 0xffffffff) 2392 rpool->counter.addr32[0] = 2393 htonl(karc4random()); 2394 break; 2395 #endif /* INET6 */ 2396 } 2397 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2398 PF_ACPY(init_addr, naddr, af); 2399 2400 } else { 2401 PF_AINC(&rpool->counter, af); 2402 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2403 } 2404 break; 2405 case PF_POOL_SRCHASH: 2406 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2407 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2408 break; 2409 case PF_POOL_ROUNDROBIN: 2410 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2411 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2412 &rpool->tblidx, &rpool->counter, 2413 &raddr, &rmask, af)) 2414 goto get_addr; 2415 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2416 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2417 &rpool->tblidx, &rpool->counter, 2418 &raddr, &rmask, af)) 2419 goto get_addr; 2420 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2421 goto get_addr; 2422 2423 try_next: 2424 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2425 rpool->cur = TAILQ_FIRST(&rpool->list); 2426 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2427 rpool->tblidx = -1; 2428 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2429 &rpool->tblidx, &rpool->counter, 2430 &raddr, &rmask, af)) { 2431 /* table contains no address of type 'af' */ 2432 if (rpool->cur != acur) 2433 goto try_next; 2434 return (1); 2435 } 2436 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2437 rpool->tblidx = -1; 2438 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2439 &rpool->tblidx, &rpool->counter, 2440 &raddr, &rmask, af)) { 2441 /* table contains no address of type 'af' */ 2442 if (rpool->cur != acur) 2443 goto try_next; 2444 return (1); 2445 } 2446 } else { 2447 raddr = &rpool->cur->addr.v.a.addr; 2448 rmask = &rpool->cur->addr.v.a.mask; 2449 PF_ACPY(&rpool->counter, raddr, af); 2450 } 2451 2452 get_addr: 2453 PF_ACPY(naddr, &rpool->counter, af); 2454 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2455 PF_ACPY(init_addr, naddr, af); 2456 PF_AINC(&rpool->counter, af); 2457 break; 2458 } 2459 if (*sn != NULL) 2460 PF_ACPY(&(*sn)->raddr, naddr, af); 2461 2462 if (pf_status.debug >= PF_DEBUG_MISC && 2463 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2464 kprintf("pf_map_addr: selected address "); 2465 pf_print_host(naddr, 0, af); 2466 kprintf("\n"); 2467 } 2468 2469 return (0); 2470 } 2471 2472 int 2473 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2474 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2475 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2476 struct pf_src_node **sn) 2477 { 2478 struct pf_state_key_cmp key; 2479 struct pf_addr init_addr; 2480 u_int16_t cut; 2481 2482 bzero(&init_addr, sizeof(init_addr)); 2483 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2484 return (1); 2485 2486 if (proto == IPPROTO_ICMP) { 2487 low = 1; 2488 high = 65535; 2489 } 2490 2491 do { 2492 key.af = af; 2493 key.proto = proto; 2494 PF_ACPY(&key.addr[1], daddr, key.af); 2495 PF_ACPY(&key.addr[0], naddr, key.af); 2496 key.port[1] = dport; 2497 2498 /* 2499 * port search; start random, step; 2500 * similar 2 portloop in in_pcbbind 2501 */ 2502 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2503 proto == IPPROTO_ICMP)) { 2504 key.port[0] = dport; 2505 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) 2506 return (0); 2507 } else if (low == 0 && high == 0) { 2508 key.port[0] = *nport; 2509 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) 2510 return (0); 2511 } else if (low == high) { 2512 key.port[0] = htons(low); 2513 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 2514 *nport = htons(low); 2515 return (0); 2516 } 2517 } else { 2518 u_int16_t tmp; 2519 2520 if (low > high) { 2521 tmp = low; 2522 low = high; 2523 high = tmp; 2524 } 2525 /* low < high */ 2526 cut = htonl(karc4random()) % (1 + high - low) + low; 2527 /* low <= cut <= high */ 2528 for (tmp = cut; tmp <= high; ++(tmp)) { 2529 key.port[0] = htons(tmp); 2530 if (pf_find_state_all(&key, PF_IN, NULL) == 2531 NULL && !in_baddynamic(tmp, proto)) { 2532 *nport = htons(tmp); 2533 return (0); 2534 } 2535 } 2536 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2537 key.port[0] = htons(tmp); 2538 if (pf_find_state_all(&key, PF_IN, NULL) == 2539 NULL && !in_baddynamic(tmp, proto)) { 2540 *nport = htons(tmp); 2541 return (0); 2542 } 2543 } 2544 } 2545 2546 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2547 case PF_POOL_RANDOM: 2548 case PF_POOL_ROUNDROBIN: 2549 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2550 return (1); 2551 break; 2552 case PF_POOL_NONE: 2553 case PF_POOL_SRCHASH: 2554 case PF_POOL_BITMASK: 2555 default: 2556 return (1); 2557 } 2558 } while (! PF_AEQ(&init_addr, naddr, af) ); 2559 return (1); /* none available */ 2560 } 2561 2562 struct pf_rule * 2563 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2564 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2565 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2566 { 2567 struct pf_rule *r, *rm = NULL; 2568 struct pf_ruleset *ruleset = NULL; 2569 int tag = -1; 2570 int rtableid = -1; 2571 int asd = 0; 2572 2573 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2574 while (r && rm == NULL) { 2575 struct pf_rule_addr *src = NULL, *dst = NULL; 2576 struct pf_addr_wrap *xdst = NULL; 2577 2578 if (r->action == PF_BINAT && direction == PF_IN) { 2579 src = &r->dst; 2580 if (r->rpool.cur != NULL) 2581 xdst = &r->rpool.cur->addr; 2582 } else { 2583 src = &r->src; 2584 dst = &r->dst; 2585 } 2586 2587 r->evaluations++; 2588 if (pfi_kif_match(r->kif, kif) == r->ifnot) 2589 r = r->skip[PF_SKIP_IFP].ptr; 2590 else if (r->direction && r->direction != direction) 2591 r = r->skip[PF_SKIP_DIR].ptr; 2592 else if (r->af && r->af != pd->af) 2593 r = r->skip[PF_SKIP_AF].ptr; 2594 else if (r->proto && r->proto != pd->proto) 2595 r = r->skip[PF_SKIP_PROTO].ptr; 2596 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2597 src->neg, kif)) 2598 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2599 PF_SKIP_DST_ADDR].ptr; 2600 else if (src->port_op && !pf_match_port(src->port_op, 2601 src->port[0], src->port[1], sport)) 2602 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2603 PF_SKIP_DST_PORT].ptr; 2604 else if (dst != NULL && 2605 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2606 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2607 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2608 0, NULL)) 2609 r = TAILQ_NEXT(r, entries); 2610 else if (dst != NULL && dst->port_op && 2611 !pf_match_port(dst->port_op, dst->port[0], 2612 dst->port[1], dport)) 2613 r = r->skip[PF_SKIP_DST_PORT].ptr; 2614 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 2615 r = TAILQ_NEXT(r, entries); 2616 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2617 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2618 off, pd->hdr.tcp), r->os_fingerprint))) 2619 r = TAILQ_NEXT(r, entries); 2620 else { 2621 if (r->tag) 2622 tag = r->tag; 2623 if (r->rtableid >= 0) 2624 rtableid = r->rtableid; 2625 if (r->anchor == NULL) { 2626 rm = r; 2627 } else 2628 pf_step_into_anchor(&asd, &ruleset, rs_num, 2629 &r, NULL, NULL); 2630 } 2631 if (r == NULL) 2632 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2633 NULL, NULL); 2634 } 2635 if (pf_tag_packet(m, tag, rtableid)) 2636 return (NULL); 2637 if (rm != NULL && (rm->action == PF_NONAT || 2638 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2639 return (NULL); 2640 return (rm); 2641 } 2642 2643 struct pf_rule * 2644 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2645 struct pfi_kif *kif, struct pf_src_node **sn, 2646 struct pf_state_key **skw, struct pf_state_key **sks, 2647 struct pf_state_key **skp, struct pf_state_key **nkp, 2648 struct pf_addr *saddr, struct pf_addr *daddr, 2649 u_int16_t sport, u_int16_t dport) 2650 { 2651 struct pf_rule *r = NULL; 2652 2653 2654 if (direction == PF_OUT) { 2655 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2656 sport, daddr, dport, PF_RULESET_BINAT); 2657 if (r == NULL) 2658 r = pf_match_translation(pd, m, off, direction, kif, 2659 saddr, sport, daddr, dport, PF_RULESET_NAT); 2660 } else { 2661 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2662 sport, daddr, dport, PF_RULESET_RDR); 2663 if (r == NULL) 2664 r = pf_match_translation(pd, m, off, direction, kif, 2665 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2666 } 2667 2668 if (r != NULL) { 2669 struct pf_addr *naddr; 2670 u_int16_t *nport; 2671 2672 if (pf_state_key_setup(pd, r, skw, sks, skp, nkp, 2673 saddr, daddr, sport, dport)) 2674 return r; 2675 2676 /* XXX We only modify one side for now. */ 2677 naddr = &(*nkp)->addr[1]; 2678 nport = &(*nkp)->port[1]; 2679 2680 /* 2681 * NOTE: Currently all translations will clear 2682 * BRIDGE_MBUF_TAGGED, telling the bridge to 2683 * ignore the original input encapsulation. 2684 */ 2685 switch (r->action) { 2686 case PF_NONAT: 2687 case PF_NOBINAT: 2688 case PF_NORDR: 2689 return (NULL); 2690 case PF_NAT: 2691 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 2692 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2693 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2694 r->rpool.proxy_port[1], sn)) { 2695 DPFPRINTF(PF_DEBUG_MISC, 2696 ("pf: NAT proxy port allocation " 2697 "(%u-%u) failed\n", 2698 r->rpool.proxy_port[0], 2699 r->rpool.proxy_port[1])); 2700 return (NULL); 2701 } 2702 break; 2703 case PF_BINAT: 2704 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 2705 switch (direction) { 2706 case PF_OUT: 2707 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2708 switch (pd->af) { 2709 #ifdef INET 2710 case AF_INET: 2711 if (r->rpool.cur->addr.p.dyn-> 2712 pfid_acnt4 < 1) 2713 return (NULL); 2714 PF_POOLMASK(naddr, 2715 &r->rpool.cur->addr.p.dyn-> 2716 pfid_addr4, 2717 &r->rpool.cur->addr.p.dyn-> 2718 pfid_mask4, 2719 saddr, AF_INET); 2720 break; 2721 #endif /* INET */ 2722 #ifdef INET6 2723 case AF_INET6: 2724 if (r->rpool.cur->addr.p.dyn-> 2725 pfid_acnt6 < 1) 2726 return (NULL); 2727 PF_POOLMASK(naddr, 2728 &r->rpool.cur->addr.p.dyn-> 2729 pfid_addr6, 2730 &r->rpool.cur->addr.p.dyn-> 2731 pfid_mask6, 2732 saddr, AF_INET6); 2733 break; 2734 #endif /* INET6 */ 2735 } 2736 } else 2737 PF_POOLMASK(naddr, 2738 &r->rpool.cur->addr.v.a.addr, 2739 &r->rpool.cur->addr.v.a.mask, 2740 saddr, pd->af); 2741 break; 2742 case PF_IN: 2743 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2744 switch (pd->af) { 2745 #ifdef INET 2746 case AF_INET: 2747 if (r->src.addr.p.dyn-> 2748 pfid_acnt4 < 1) 2749 return (NULL); 2750 PF_POOLMASK(naddr, 2751 &r->src.addr.p.dyn-> 2752 pfid_addr4, 2753 &r->src.addr.p.dyn-> 2754 pfid_mask4, 2755 daddr, AF_INET); 2756 break; 2757 #endif /* INET */ 2758 #ifdef INET6 2759 case AF_INET6: 2760 if (r->src.addr.p.dyn-> 2761 pfid_acnt6 < 1) 2762 return (NULL); 2763 PF_POOLMASK(naddr, 2764 &r->src.addr.p.dyn-> 2765 pfid_addr6, 2766 &r->src.addr.p.dyn-> 2767 pfid_mask6, 2768 daddr, AF_INET6); 2769 break; 2770 #endif /* INET6 */ 2771 } 2772 } else 2773 PF_POOLMASK(naddr, 2774 &r->src.addr.v.a.addr, 2775 &r->src.addr.v.a.mask, daddr, 2776 pd->af); 2777 break; 2778 } 2779 break; 2780 case PF_RDR: { 2781 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 2782 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2783 return (NULL); 2784 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2785 PF_POOL_BITMASK) 2786 PF_POOLMASK(naddr, naddr, 2787 &r->rpool.cur->addr.v.a.mask, daddr, 2788 pd->af); 2789 2790 if (r->rpool.proxy_port[1]) { 2791 u_int32_t tmp_nport; 2792 2793 tmp_nport = ((ntohs(dport) - 2794 ntohs(r->dst.port[0])) % 2795 (r->rpool.proxy_port[1] - 2796 r->rpool.proxy_port[0] + 1)) + 2797 r->rpool.proxy_port[0]; 2798 2799 /* wrap around if necessary */ 2800 if (tmp_nport > 65535) 2801 tmp_nport -= 65535; 2802 *nport = htons((u_int16_t)tmp_nport); 2803 } else if (r->rpool.proxy_port[0]) 2804 *nport = htons(r->rpool.proxy_port[0]); 2805 break; 2806 } 2807 default: 2808 return (NULL); 2809 } 2810 } 2811 2812 return (r); 2813 } 2814 2815 #ifdef SMP 2816 struct netmsg_hashlookup { 2817 struct netmsg_base base; 2818 struct inpcb **nm_pinp; 2819 struct inpcbinfo *nm_pcbinfo; 2820 struct pf_addr *nm_saddr; 2821 struct pf_addr *nm_daddr; 2822 uint16_t nm_sport; 2823 uint16_t nm_dport; 2824 sa_family_t nm_af; 2825 }; 2826 2827 #ifdef PF_SOCKET_LOOKUP_DOMSG 2828 static void 2829 in_pcblookup_hash_handler(netmsg_t msg) 2830 { 2831 struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg; 2832 2833 if (rmsg->nm_af == AF_INET) 2834 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo, 2835 rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4, 2836 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2837 #ifdef INET6 2838 else 2839 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo, 2840 &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6, 2841 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2842 #endif /* INET6 */ 2843 lwkt_replymsg(&rmsg->base.lmsg, 0); 2844 } 2845 #endif /* PF_SOCKET_LOOKUP_DOMSG */ 2846 2847 #endif /* SMP */ 2848 2849 int 2850 pf_socket_lookup(int direction, struct pf_pdesc *pd) 2851 { 2852 struct pf_addr *saddr, *daddr; 2853 u_int16_t sport, dport; 2854 struct inpcbinfo *pi; 2855 struct inpcb *inp; 2856 #ifdef SMP 2857 struct netmsg_hashlookup *msg = NULL; 2858 #ifdef PF_SOCKET_LOOKUP_DOMSG 2859 struct netmsg_hashlookup msg0; 2860 #endif 2861 #endif 2862 int pi_cpu = 0; 2863 2864 if (pd == NULL) 2865 return (-1); 2866 pd->lookup.uid = UID_MAX; 2867 pd->lookup.gid = GID_MAX; 2868 pd->lookup.pid = NO_PID; 2869 if (direction == PF_IN) { 2870 saddr = pd->src; 2871 daddr = pd->dst; 2872 } else { 2873 saddr = pd->dst; 2874 daddr = pd->src; 2875 } 2876 switch (pd->proto) { 2877 case IPPROTO_TCP: 2878 if (pd->hdr.tcp == NULL) 2879 return (-1); 2880 sport = pd->hdr.tcp->th_sport; 2881 dport = pd->hdr.tcp->th_dport; 2882 2883 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport); 2884 pi = &tcbinfo[pi_cpu]; 2885 #ifdef SMP 2886 /* 2887 * Our netstack runs lockless on MP systems 2888 * (only for TCP connections at the moment). 2889 * 2890 * As we are not allowed to read another CPU's tcbinfo, 2891 * we have to ask that CPU via remote call to search the 2892 * table for us. 2893 * 2894 * Prepare a msg iff data belongs to another CPU. 2895 */ 2896 if (pi_cpu != mycpu->gd_cpuid) { 2897 #ifdef PF_SOCKET_LOOKUP_DOMSG 2898 /* 2899 * NOTE: 2900 * 2901 * Following lwkt_domsg() is dangerous and could 2902 * lockup the network system, e.g. 2903 * 2904 * On 2 CPU system: 2905 * netisr0 domsg to netisr1 (due to lookup) 2906 * netisr1 domsg to netisr0 (due to lookup) 2907 * 2908 * We simply return -1 here, since we are probably 2909 * called before NAT, so the TCP packet should 2910 * already be on the correct CPU. 2911 */ 2912 msg = &msg0; 2913 netmsg_init(&msg->base, NULL, &curthread->td_msgport, 2914 0, in_pcblookup_hash_handler); 2915 msg->nm_pinp = &inp; 2916 msg->nm_pcbinfo = pi; 2917 msg->nm_saddr = saddr; 2918 msg->nm_sport = sport; 2919 msg->nm_daddr = daddr; 2920 msg->nm_dport = dport; 2921 msg->nm_af = pd->af; 2922 #else /* !PF_SOCKET_LOOKUP_DOMSG */ 2923 kprintf("pf_socket_lookup: tcp packet not on the " 2924 "correct cpu %d, cur cpu %d\n", 2925 pi_cpu, mycpuid); 2926 print_backtrace(-1); 2927 return -1; 2928 #endif /* PF_SOCKET_LOOKUP_DOMSG */ 2929 } 2930 #endif /* SMP */ 2931 break; 2932 case IPPROTO_UDP: 2933 if (pd->hdr.udp == NULL) 2934 return (-1); 2935 sport = pd->hdr.udp->uh_sport; 2936 dport = pd->hdr.udp->uh_dport; 2937 pi = &udbinfo; 2938 break; 2939 default: 2940 return (-1); 2941 } 2942 if (direction != PF_IN) { 2943 u_int16_t p; 2944 2945 p = sport; 2946 sport = dport; 2947 dport = p; 2948 } 2949 switch (pd->af) { 2950 #ifdef INET6 2951 case AF_INET6: 2952 #ifdef SMP 2953 /* 2954 * Query other CPU, second part 2955 * 2956 * msg only gets initialized when: 2957 * 1) packet is TCP 2958 * 2) the info belongs to another CPU 2959 * 2960 * Use some switch/case magic to avoid code duplication. 2961 */ 2962 if (msg == NULL) 2963 #endif /* SMP */ 2964 { 2965 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2966 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 2967 2968 if (inp == NULL) 2969 return (-1); 2970 break; 2971 } 2972 /* FALLTHROUGH if SMP and on other CPU */ 2973 #endif /* INET6 */ 2974 case AF_INET: 2975 #ifdef SMP 2976 if (msg != NULL) { 2977 lwkt_domsg(cpu_portfn(pi_cpu), 2978 &msg->base.lmsg, 0); 2979 } else 2980 #endif /* SMP */ 2981 { 2982 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2983 dport, INPLOOKUP_WILDCARD, NULL); 2984 } 2985 if (inp == NULL) 2986 return (-1); 2987 break; 2988 2989 default: 2990 return (-1); 2991 } 2992 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid; 2993 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0]; 2994 return (1); 2995 } 2996 2997 u_int8_t 2998 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2999 { 3000 int hlen; 3001 u_int8_t hdr[60]; 3002 u_int8_t *opt, optlen; 3003 u_int8_t wscale = 0; 3004 3005 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3006 if (hlen <= sizeof(struct tcphdr)) 3007 return (0); 3008 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3009 return (0); 3010 opt = hdr + sizeof(struct tcphdr); 3011 hlen -= sizeof(struct tcphdr); 3012 while (hlen >= 3) { 3013 switch (*opt) { 3014 case TCPOPT_EOL: 3015 case TCPOPT_NOP: 3016 ++opt; 3017 --hlen; 3018 break; 3019 case TCPOPT_WINDOW: 3020 wscale = opt[2]; 3021 if (wscale > TCP_MAX_WINSHIFT) 3022 wscale = TCP_MAX_WINSHIFT; 3023 wscale |= PF_WSCALE_FLAG; 3024 /* FALLTHROUGH */ 3025 default: 3026 optlen = opt[1]; 3027 if (optlen < 2) 3028 optlen = 2; 3029 hlen -= optlen; 3030 opt += optlen; 3031 break; 3032 } 3033 } 3034 return (wscale); 3035 } 3036 3037 u_int16_t 3038 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3039 { 3040 int hlen; 3041 u_int8_t hdr[60]; 3042 u_int8_t *opt, optlen; 3043 u_int16_t mss = tcp_mssdflt; 3044 3045 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3046 if (hlen <= sizeof(struct tcphdr)) 3047 return (0); 3048 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3049 return (0); 3050 opt = hdr + sizeof(struct tcphdr); 3051 hlen -= sizeof(struct tcphdr); 3052 while (hlen >= TCPOLEN_MAXSEG) { 3053 switch (*opt) { 3054 case TCPOPT_EOL: 3055 case TCPOPT_NOP: 3056 ++opt; 3057 --hlen; 3058 break; 3059 case TCPOPT_MAXSEG: 3060 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3061 /* FALLTHROUGH */ 3062 default: 3063 optlen = opt[1]; 3064 if (optlen < 2) 3065 optlen = 2; 3066 hlen -= optlen; 3067 opt += optlen; 3068 break; 3069 } 3070 } 3071 return (mss); 3072 } 3073 3074 u_int16_t 3075 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3076 { 3077 #ifdef INET 3078 struct sockaddr_in *dst; 3079 struct route ro; 3080 #endif /* INET */ 3081 #ifdef INET6 3082 struct sockaddr_in6 *dst6; 3083 struct route_in6 ro6; 3084 #endif /* INET6 */ 3085 struct rtentry *rt = NULL; 3086 int hlen = 0; 3087 u_int16_t mss = tcp_mssdflt; 3088 3089 switch (af) { 3090 #ifdef INET 3091 case AF_INET: 3092 hlen = sizeof(struct ip); 3093 bzero(&ro, sizeof(ro)); 3094 dst = (struct sockaddr_in *)&ro.ro_dst; 3095 dst->sin_family = AF_INET; 3096 dst->sin_len = sizeof(*dst); 3097 dst->sin_addr = addr->v4; 3098 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3099 rt = ro.ro_rt; 3100 break; 3101 #endif /* INET */ 3102 #ifdef INET6 3103 case AF_INET6: 3104 hlen = sizeof(struct ip6_hdr); 3105 bzero(&ro6, sizeof(ro6)); 3106 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3107 dst6->sin6_family = AF_INET6; 3108 dst6->sin6_len = sizeof(*dst6); 3109 dst6->sin6_addr = addr->v6; 3110 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING)); 3111 rt = ro6.ro_rt; 3112 break; 3113 #endif /* INET6 */ 3114 } 3115 3116 if (rt && rt->rt_ifp) { 3117 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3118 mss = max(tcp_mssdflt, mss); 3119 RTFREE(rt); 3120 } 3121 mss = min(mss, offer); 3122 mss = max(mss, 64); /* sanity - at least max opt space */ 3123 return (mss); 3124 } 3125 3126 void 3127 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3128 { 3129 struct pf_rule *r = s->rule.ptr; 3130 3131 s->rt_kif = NULL; 3132 if (!r->rt || r->rt == PF_FASTROUTE) 3133 return; 3134 switch (s->key[PF_SK_WIRE]->af) { 3135 #ifdef INET 3136 case AF_INET: 3137 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3138 &s->nat_src_node); 3139 s->rt_kif = r->rpool.cur->kif; 3140 break; 3141 #endif /* INET */ 3142 #ifdef INET6 3143 case AF_INET6: 3144 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3145 &s->nat_src_node); 3146 s->rt_kif = r->rpool.cur->kif; 3147 break; 3148 #endif /* INET6 */ 3149 } 3150 } 3151 3152 u_int32_t 3153 pf_tcp_iss(struct pf_pdesc *pd) 3154 { 3155 MD5_CTX ctx; 3156 u_int32_t digest[4]; 3157 3158 if (pf_tcp_secret_init == 0) { 3159 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret)); 3160 MD5Init(&pf_tcp_secret_ctx); 3161 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret, 3162 sizeof(pf_tcp_secret)); 3163 pf_tcp_secret_init = 1; 3164 } 3165 ctx = pf_tcp_secret_ctx; 3166 3167 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3168 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3169 if (pd->af == AF_INET6) { 3170 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3171 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3172 } else { 3173 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3174 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3175 } 3176 MD5Final((u_char *)digest, &ctx); 3177 pf_tcp_iss_off += 4096; 3178 return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off); 3179 } 3180 3181 int 3182 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3183 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3184 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3185 struct ifqueue *ifq, struct inpcb *inp) 3186 { 3187 struct pf_rule *nr = NULL; 3188 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3189 sa_family_t af = pd->af; 3190 struct pf_rule *r, *a = NULL; 3191 struct pf_ruleset *ruleset = NULL; 3192 struct pf_src_node *nsn = NULL; 3193 struct tcphdr *th = pd->hdr.tcp; 3194 struct pf_state_key *skw = NULL, *sks = NULL; 3195 struct pf_state_key *sk = NULL, *nk = NULL; 3196 u_short reason; 3197 int rewrite = 0, hdrlen = 0; 3198 int tag = -1, rtableid = -1; 3199 int asd = 0; 3200 int match = 0; 3201 int state_icmp = 0; 3202 u_int16_t sport = 0, dport = 0; 3203 u_int16_t nport = 0, bport = 0; 3204 u_int16_t bproto_sum = 0, bip_sum = 0; 3205 u_int8_t icmptype = 0, icmpcode = 0; 3206 3207 3208 if (direction == PF_IN && pf_check_congestion(ifq)) { 3209 REASON_SET(&reason, PFRES_CONGEST); 3210 return (PF_DROP); 3211 } 3212 3213 if (inp != NULL) 3214 pd->lookup.done = pf_socket_lookup(direction, pd); 3215 else if (debug_pfugidhack) { 3216 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3217 pd->lookup.done = pf_socket_lookup(direction, pd); 3218 } 3219 3220 switch (pd->proto) { 3221 case IPPROTO_TCP: 3222 sport = th->th_sport; 3223 dport = th->th_dport; 3224 hdrlen = sizeof(*th); 3225 break; 3226 case IPPROTO_UDP: 3227 sport = pd->hdr.udp->uh_sport; 3228 dport = pd->hdr.udp->uh_dport; 3229 hdrlen = sizeof(*pd->hdr.udp); 3230 break; 3231 #ifdef INET 3232 case IPPROTO_ICMP: 3233 if (pd->af != AF_INET) 3234 break; 3235 sport = dport = pd->hdr.icmp->icmp_id; 3236 hdrlen = sizeof(*pd->hdr.icmp); 3237 icmptype = pd->hdr.icmp->icmp_type; 3238 icmpcode = pd->hdr.icmp->icmp_code; 3239 3240 if (icmptype == ICMP_UNREACH || 3241 icmptype == ICMP_SOURCEQUENCH || 3242 icmptype == ICMP_REDIRECT || 3243 icmptype == ICMP_TIMXCEED || 3244 icmptype == ICMP_PARAMPROB) 3245 state_icmp++; 3246 break; 3247 #endif /* INET */ 3248 #ifdef INET6 3249 case IPPROTO_ICMPV6: 3250 if (af != AF_INET6) 3251 break; 3252 sport = dport = pd->hdr.icmp6->icmp6_id; 3253 hdrlen = sizeof(*pd->hdr.icmp6); 3254 icmptype = pd->hdr.icmp6->icmp6_type; 3255 icmpcode = pd->hdr.icmp6->icmp6_code; 3256 3257 if (icmptype == ICMP6_DST_UNREACH || 3258 icmptype == ICMP6_PACKET_TOO_BIG || 3259 icmptype == ICMP6_TIME_EXCEEDED || 3260 icmptype == ICMP6_PARAM_PROB) 3261 state_icmp++; 3262 break; 3263 #endif /* INET6 */ 3264 default: 3265 sport = dport = hdrlen = 0; 3266 break; 3267 } 3268 3269 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3270 3271 bport = nport = sport; 3272 /* check packet for BINAT/NAT/RDR */ 3273 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, 3274 &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) { 3275 if (nk == NULL || sk == NULL) { 3276 REASON_SET(&reason, PFRES_MEMORY); 3277 goto cleanup; 3278 } 3279 3280 if (pd->ip_sum) 3281 bip_sum = *pd->ip_sum; 3282 3283 switch (pd->proto) { 3284 case IPPROTO_TCP: 3285 bproto_sum = th->th_sum; 3286 pd->proto_sum = &th->th_sum; 3287 3288 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3289 nk->port[pd->sidx] != sport) { 3290 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3291 &th->th_sum, &nk->addr[pd->sidx], 3292 nk->port[pd->sidx], 0, af); 3293 pd->sport = &th->th_sport; 3294 sport = th->th_sport; 3295 } 3296 3297 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3298 nk->port[pd->didx] != dport) { 3299 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3300 &th->th_sum, &nk->addr[pd->didx], 3301 nk->port[pd->didx], 0, af); 3302 dport = th->th_dport; 3303 pd->dport = &th->th_dport; 3304 } 3305 rewrite++; 3306 break; 3307 case IPPROTO_UDP: 3308 bproto_sum = pd->hdr.udp->uh_sum; 3309 pd->proto_sum = &pd->hdr.udp->uh_sum; 3310 3311 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3312 nk->port[pd->sidx] != sport) { 3313 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3314 pd->ip_sum, &pd->hdr.udp->uh_sum, 3315 &nk->addr[pd->sidx], 3316 nk->port[pd->sidx], 1, af); 3317 sport = pd->hdr.udp->uh_sport; 3318 pd->sport = &pd->hdr.udp->uh_sport; 3319 } 3320 3321 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3322 nk->port[pd->didx] != dport) { 3323 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3324 pd->ip_sum, &pd->hdr.udp->uh_sum, 3325 &nk->addr[pd->didx], 3326 nk->port[pd->didx], 1, af); 3327 dport = pd->hdr.udp->uh_dport; 3328 pd->dport = &pd->hdr.udp->uh_dport; 3329 } 3330 rewrite++; 3331 break; 3332 #ifdef INET 3333 case IPPROTO_ICMP: 3334 nk->port[0] = nk->port[1]; 3335 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3336 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3337 nk->addr[pd->sidx].v4.s_addr, 0); 3338 3339 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3340 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3341 nk->addr[pd->didx].v4.s_addr, 0); 3342 3343 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3344 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3345 pd->hdr.icmp->icmp_cksum, sport, 3346 nk->port[1], 0); 3347 pd->hdr.icmp->icmp_id = nk->port[1]; 3348 pd->sport = &pd->hdr.icmp->icmp_id; 3349 } 3350 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3351 break; 3352 #endif /* INET */ 3353 #ifdef INET6 3354 case IPPROTO_ICMPV6: 3355 nk->port[0] = nk->port[1]; 3356 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3357 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3358 &nk->addr[pd->sidx], 0); 3359 3360 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3361 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3362 &nk->addr[pd->didx], 0); 3363 rewrite++; 3364 break; 3365 #endif /* INET */ 3366 default: 3367 switch (af) { 3368 #ifdef INET 3369 case AF_INET: 3370 if (PF_ANEQ(saddr, 3371 &nk->addr[pd->sidx], AF_INET)) 3372 pf_change_a(&saddr->v4.s_addr, 3373 pd->ip_sum, 3374 nk->addr[pd->sidx].v4.s_addr, 0); 3375 3376 if (PF_ANEQ(daddr, 3377 &nk->addr[pd->didx], AF_INET)) 3378 pf_change_a(&daddr->v4.s_addr, 3379 pd->ip_sum, 3380 nk->addr[pd->didx].v4.s_addr, 0); 3381 break; 3382 #endif /* INET */ 3383 #ifdef INET6 3384 case AF_INET6: 3385 if (PF_ANEQ(saddr, 3386 &nk->addr[pd->sidx], AF_INET6)) 3387 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3388 3389 if (PF_ANEQ(daddr, 3390 &nk->addr[pd->didx], AF_INET6)) 3391 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3392 break; 3393 #endif /* INET */ 3394 } 3395 break; 3396 } 3397 if (nr->natpass) 3398 r = NULL; 3399 pd->nat_rule = nr; 3400 } 3401 3402 while (r != NULL) { 3403 r->evaluations++; 3404 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3405 r = r->skip[PF_SKIP_IFP].ptr; 3406 else if (r->direction && r->direction != direction) 3407 r = r->skip[PF_SKIP_DIR].ptr; 3408 else if (r->af && r->af != af) 3409 r = r->skip[PF_SKIP_AF].ptr; 3410 else if (r->proto && r->proto != pd->proto) 3411 r = r->skip[PF_SKIP_PROTO].ptr; 3412 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3413 r->src.neg, kif)) 3414 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3415 /* tcp/udp only. port_op always 0 in other cases */ 3416 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3417 r->src.port[0], r->src.port[1], sport)) 3418 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3419 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3420 r->dst.neg, NULL)) 3421 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3422 /* tcp/udp only. port_op always 0 in other cases */ 3423 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3424 r->dst.port[0], r->dst.port[1], dport)) 3425 r = r->skip[PF_SKIP_DST_PORT].ptr; 3426 /* icmp only. type always 0 in other cases */ 3427 else if (r->type && r->type != icmptype + 1) 3428 r = TAILQ_NEXT(r, entries); 3429 /* icmp only. type always 0 in other cases */ 3430 else if (r->code && r->code != icmpcode + 1) 3431 r = TAILQ_NEXT(r, entries); 3432 else if (r->tos && !(r->tos == pd->tos)) 3433 r = TAILQ_NEXT(r, entries); 3434 else if (r->rule_flag & PFRULE_FRAGMENT) 3435 r = TAILQ_NEXT(r, entries); 3436 else if (pd->proto == IPPROTO_TCP && 3437 (r->flagset & th->th_flags) != r->flags) 3438 r = TAILQ_NEXT(r, entries); 3439 /* tcp/udp only. uid.op always 0 in other cases */ 3440 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3441 pf_socket_lookup(direction, pd), 1)) && 3442 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3443 pd->lookup.uid)) 3444 r = TAILQ_NEXT(r, entries); 3445 /* tcp/udp only. gid.op always 0 in other cases */ 3446 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3447 pf_socket_lookup(direction, pd), 1)) && 3448 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3449 pd->lookup.gid)) 3450 r = TAILQ_NEXT(r, entries); 3451 else if (r->prob && 3452 r->prob <= karc4random()) 3453 r = TAILQ_NEXT(r, entries); 3454 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3455 r = TAILQ_NEXT(r, entries); 3456 else if (r->os_fingerprint != PF_OSFP_ANY && 3457 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3458 pf_osfp_fingerprint(pd, m, off, th), 3459 r->os_fingerprint))) 3460 r = TAILQ_NEXT(r, entries); 3461 else { 3462 if (r->tag) 3463 tag = r->tag; 3464 if (r->rtableid >= 0) 3465 rtableid = r->rtableid; 3466 if (r->anchor == NULL) { 3467 match = 1; 3468 *rm = r; 3469 *am = a; 3470 *rsm = ruleset; 3471 if ((*rm)->quick) 3472 break; 3473 r = TAILQ_NEXT(r, entries); 3474 } else 3475 pf_step_into_anchor(&asd, &ruleset, 3476 PF_RULESET_FILTER, &r, &a, &match); 3477 } 3478 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3479 PF_RULESET_FILTER, &r, &a, &match)) 3480 break; 3481 } 3482 r = *rm; 3483 a = *am; 3484 ruleset = *rsm; 3485 3486 REASON_SET(&reason, PFRES_MATCH); 3487 3488 if (r->log || (nr != NULL && nr->log)) { 3489 if (rewrite) 3490 m_copyback(m, off, hdrlen, pd->hdr.any); 3491 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3492 a, ruleset, pd); 3493 } 3494 3495 if ((r->action == PF_DROP) && 3496 ((r->rule_flag & PFRULE_RETURNRST) || 3497 (r->rule_flag & PFRULE_RETURNICMP) || 3498 (r->rule_flag & PFRULE_RETURN))) { 3499 /* undo NAT changes, if they have taken place */ 3500 if (nr != NULL) { 3501 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3502 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3503 if (pd->sport) 3504 *pd->sport = sk->port[pd->sidx]; 3505 if (pd->dport) 3506 *pd->dport = sk->port[pd->didx]; 3507 if (pd->proto_sum) 3508 *pd->proto_sum = bproto_sum; 3509 if (pd->ip_sum) 3510 *pd->ip_sum = bip_sum; 3511 m_copyback(m, off, hdrlen, pd->hdr.any); 3512 } 3513 if (pd->proto == IPPROTO_TCP && 3514 ((r->rule_flag & PFRULE_RETURNRST) || 3515 (r->rule_flag & PFRULE_RETURN)) && 3516 !(th->th_flags & TH_RST)) { 3517 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3518 int len = 0; 3519 struct ip *h4; 3520 #ifdef INET6 3521 struct ip6_hdr *h6; 3522 #endif 3523 switch (af) { 3524 case AF_INET: 3525 h4 = mtod(m, struct ip *); 3526 len = h4->ip_len - off; 3527 break; 3528 #ifdef INET6 3529 case AF_INET6: 3530 h6 = mtod(m, struct ip6_hdr *); 3531 len = h6->ip6_plen - (off - sizeof(*h6)); 3532 break; 3533 #endif 3534 } 3535 3536 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3537 REASON_SET(&reason, PFRES_PROTCKSUM); 3538 else { 3539 if (th->th_flags & TH_SYN) 3540 ack++; 3541 if (th->th_flags & TH_FIN) 3542 ack++; 3543 pf_send_tcp(r, af, pd->dst, 3544 pd->src, th->th_dport, th->th_sport, 3545 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3546 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3547 } 3548 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3549 r->return_icmp) 3550 pf_send_icmp(m, r->return_icmp >> 8, 3551 r->return_icmp & 255, af, r); 3552 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3553 r->return_icmp6) 3554 pf_send_icmp(m, r->return_icmp6 >> 8, 3555 r->return_icmp6 & 255, af, r); 3556 } 3557 3558 if (r->action == PF_DROP) 3559 goto cleanup; 3560 3561 if (pf_tag_packet(m, tag, rtableid)) { 3562 REASON_SET(&reason, PFRES_MEMORY); 3563 goto cleanup; 3564 } 3565 3566 if (!state_icmp && (r->keep_state || nr != NULL || 3567 (pd->flags & PFDESC_TCP_NORM))) { 3568 int action; 3569 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m, 3570 off, sport, dport, &rewrite, kif, sm, tag, bproto_sum, 3571 bip_sum, hdrlen); 3572 if (action != PF_PASS) 3573 return (action); 3574 } 3575 3576 /* copy back packet headers if we performed NAT operations */ 3577 if (rewrite) 3578 m_copyback(m, off, hdrlen, pd->hdr.any); 3579 3580 return (PF_PASS); 3581 3582 cleanup: 3583 if (sk != NULL) 3584 kfree(sk, M_PFSTATEKEYPL); 3585 if (nk != NULL) 3586 kfree(nk, M_PFSTATEKEYPL); 3587 return (PF_DROP); 3588 } 3589 3590 static __inline int 3591 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3592 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw, 3593 struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk, 3594 struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite, 3595 struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum, 3596 u_int16_t bip_sum, int hdrlen) 3597 { 3598 struct pf_state *s = NULL; 3599 struct pf_src_node *sn = NULL; 3600 struct tcphdr *th = pd->hdr.tcp; 3601 u_int16_t mss = tcp_mssdflt; 3602 u_short reason; 3603 3604 /* check maximums */ 3605 if (r->max_states && (r->states_cur >= r->max_states)) { 3606 pf_status.lcounters[LCNT_STATES]++; 3607 REASON_SET(&reason, PFRES_MAXSTATES); 3608 return (PF_DROP); 3609 } 3610 /* src node for filter rule */ 3611 if ((r->rule_flag & PFRULE_SRCTRACK || 3612 r->rpool.opts & PF_POOL_STICKYADDR) && 3613 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3614 REASON_SET(&reason, PFRES_SRCLIMIT); 3615 goto csfailed; 3616 } 3617 /* src node for translation rule */ 3618 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3619 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3620 REASON_SET(&reason, PFRES_SRCLIMIT); 3621 goto csfailed; 3622 } 3623 s = kmalloc(sizeof(struct pf_state), M_PFSTATEPL, M_NOWAIT|M_ZERO); 3624 if (s == NULL) { 3625 REASON_SET(&reason, PFRES_MEMORY); 3626 goto csfailed; 3627 } 3628 s->id = 0; /* XXX Do we really need that? not in OpenBSD */ 3629 s->creatorid = 0; 3630 s->rule.ptr = r; 3631 s->nat_rule.ptr = nr; 3632 s->anchor.ptr = a; 3633 STATE_INC_COUNTERS(s); 3634 if (r->allow_opts) 3635 s->state_flags |= PFSTATE_ALLOWOPTS; 3636 if (r->rule_flag & PFRULE_STATESLOPPY) 3637 s->state_flags |= PFSTATE_SLOPPY; 3638 s->log = r->log & PF_LOG_ALL; 3639 if (nr != NULL) 3640 s->log |= nr->log & PF_LOG_ALL; 3641 switch (pd->proto) { 3642 case IPPROTO_TCP: 3643 s->src.seqlo = ntohl(th->th_seq); 3644 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3645 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3646 r->keep_state == PF_STATE_MODULATE) { 3647 /* Generate sequence number modulator */ 3648 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3649 0) 3650 s->src.seqdiff = 1; 3651 pf_change_a(&th->th_seq, &th->th_sum, 3652 htonl(s->src.seqlo + s->src.seqdiff), 0); 3653 *rewrite = 1; 3654 } else 3655 s->src.seqdiff = 0; 3656 if (th->th_flags & TH_SYN) { 3657 s->src.seqhi++; 3658 s->src.wscale = pf_get_wscale(m, off, 3659 th->th_off, pd->af); 3660 } 3661 s->src.max_win = MAX(ntohs(th->th_win), 1); 3662 if (s->src.wscale & PF_WSCALE_MASK) { 3663 /* Remove scale factor from initial window */ 3664 int win = s->src.max_win; 3665 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3666 s->src.max_win = (win - 1) >> 3667 (s->src.wscale & PF_WSCALE_MASK); 3668 } 3669 if (th->th_flags & TH_FIN) 3670 s->src.seqhi++; 3671 s->dst.seqhi = 1; 3672 s->dst.max_win = 1; 3673 s->src.state = TCPS_SYN_SENT; 3674 s->dst.state = TCPS_CLOSED; 3675 s->timeout = PFTM_TCP_FIRST_PACKET; 3676 break; 3677 case IPPROTO_UDP: 3678 s->src.state = PFUDPS_SINGLE; 3679 s->dst.state = PFUDPS_NO_TRAFFIC; 3680 s->timeout = PFTM_UDP_FIRST_PACKET; 3681 break; 3682 case IPPROTO_ICMP: 3683 #ifdef INET6 3684 case IPPROTO_ICMPV6: 3685 #endif 3686 s->timeout = PFTM_ICMP_FIRST_PACKET; 3687 break; 3688 default: 3689 s->src.state = PFOTHERS_SINGLE; 3690 s->dst.state = PFOTHERS_NO_TRAFFIC; 3691 s->timeout = PFTM_OTHER_FIRST_PACKET; 3692 } 3693 3694 s->creation = time_second; 3695 s->expire = time_second; 3696 3697 if (sn != NULL) { 3698 s->src_node = sn; 3699 s->src_node->states++; 3700 } 3701 if (nsn != NULL) { 3702 /* XXX We only modify one side for now. */ 3703 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3704 s->nat_src_node = nsn; 3705 s->nat_src_node->states++; 3706 } 3707 if (pd->proto == IPPROTO_TCP) { 3708 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3709 off, pd, th, &s->src, &s->dst)) { 3710 REASON_SET(&reason, PFRES_MEMORY); 3711 pf_src_tree_remove_state(s); 3712 STATE_DEC_COUNTERS(s); 3713 kfree(s, M_PFSTATEPL); 3714 return (PF_DROP); 3715 } 3716 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3717 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3718 &s->src, &s->dst, rewrite)) { 3719 /* This really shouldn't happen!!! */ 3720 DPFPRINTF(PF_DEBUG_URGENT, 3721 ("pf_normalize_tcp_stateful failed on first pkt")); 3722 pf_normalize_tcp_cleanup(s); 3723 pf_src_tree_remove_state(s); 3724 STATE_DEC_COUNTERS(s); 3725 kfree(s, M_PFSTATEPL); 3726 return (PF_DROP); 3727 } 3728 } 3729 s->direction = pd->dir; 3730 3731 if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk, 3732 pd->src, pd->dst, sport, dport)) 3733 goto csfailed; 3734 3735 if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) { 3736 if (pd->proto == IPPROTO_TCP) 3737 pf_normalize_tcp_cleanup(s); 3738 REASON_SET(&reason, PFRES_STATEINS); 3739 pf_src_tree_remove_state(s); 3740 STATE_DEC_COUNTERS(s); 3741 kfree(s, M_PFSTATEPL); 3742 return (PF_DROP); 3743 } else 3744 *sm = s; 3745 3746 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 3747 if (tag > 0) { 3748 pf_tag_ref(tag); 3749 s->tag = tag; 3750 } 3751 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3752 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3753 s->src.state = PF_TCPS_PROXY_SRC; 3754 /* undo NAT changes, if they have taken place */ 3755 if (nr != NULL) { 3756 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3757 if (pd->dir == PF_OUT) 3758 skt = s->key[PF_SK_STACK]; 3759 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3760 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3761 if (pd->sport) 3762 *pd->sport = skt->port[pd->sidx]; 3763 if (pd->dport) 3764 *pd->dport = skt->port[pd->didx]; 3765 if (pd->proto_sum) 3766 *pd->proto_sum = bproto_sum; 3767 if (pd->ip_sum) 3768 *pd->ip_sum = bip_sum; 3769 m_copyback(m, off, hdrlen, pd->hdr.any); 3770 } 3771 s->src.seqhi = htonl(karc4random()); 3772 /* Find mss option */ 3773 mss = pf_get_mss(m, off, th->th_off, pd->af); 3774 mss = pf_calc_mss(pd->src, pd->af, mss); 3775 mss = pf_calc_mss(pd->dst, pd->af, mss); 3776 s->src.mss = mss; 3777 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 3778 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3779 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3780 REASON_SET(&reason, PFRES_SYNPROXY); 3781 return (PF_SYNPROXY_DROP); 3782 } 3783 3784 return (PF_PASS); 3785 3786 csfailed: 3787 if (sk != NULL) 3788 kfree(sk, M_PFSTATEKEYPL); 3789 if (nk != NULL) 3790 kfree(nk, M_PFSTATEKEYPL); 3791 3792 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3793 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3794 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3795 pf_status.src_nodes--; 3796 kfree(sn, M_PFSRCTREEPL); 3797 } 3798 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 3799 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3800 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3801 pf_status.src_nodes--; 3802 kfree(nsn, M_PFSRCTREEPL); 3803 } 3804 return (PF_DROP); 3805 } 3806 3807 int 3808 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3809 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3810 struct pf_ruleset **rsm) 3811 { 3812 struct pf_rule *r, *a = NULL; 3813 struct pf_ruleset *ruleset = NULL; 3814 sa_family_t af = pd->af; 3815 u_short reason; 3816 int tag = -1; 3817 int asd = 0; 3818 int match = 0; 3819 3820 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3821 while (r != NULL) { 3822 r->evaluations++; 3823 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3824 r = r->skip[PF_SKIP_IFP].ptr; 3825 else if (r->direction && r->direction != direction) 3826 r = r->skip[PF_SKIP_DIR].ptr; 3827 else if (r->af && r->af != af) 3828 r = r->skip[PF_SKIP_AF].ptr; 3829 else if (r->proto && r->proto != pd->proto) 3830 r = r->skip[PF_SKIP_PROTO].ptr; 3831 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3832 r->src.neg, kif)) 3833 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3834 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3835 r->dst.neg, NULL)) 3836 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3837 else if (r->tos && !(r->tos == pd->tos)) 3838 r = TAILQ_NEXT(r, entries); 3839 else if (r->os_fingerprint != PF_OSFP_ANY) 3840 r = TAILQ_NEXT(r, entries); 3841 else if (pd->proto == IPPROTO_UDP && 3842 (r->src.port_op || r->dst.port_op)) 3843 r = TAILQ_NEXT(r, entries); 3844 else if (pd->proto == IPPROTO_TCP && 3845 (r->src.port_op || r->dst.port_op || r->flagset)) 3846 r = TAILQ_NEXT(r, entries); 3847 else if ((pd->proto == IPPROTO_ICMP || 3848 pd->proto == IPPROTO_ICMPV6) && 3849 (r->type || r->code)) 3850 r = TAILQ_NEXT(r, entries); 3851 else if (r->prob && r->prob <= karc4random()) 3852 r = TAILQ_NEXT(r, entries); 3853 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3854 r = TAILQ_NEXT(r, entries); 3855 else { 3856 if (r->anchor == NULL) { 3857 match = 1; 3858 *rm = r; 3859 *am = a; 3860 *rsm = ruleset; 3861 if ((*rm)->quick) 3862 break; 3863 r = TAILQ_NEXT(r, entries); 3864 } else 3865 pf_step_into_anchor(&asd, &ruleset, 3866 PF_RULESET_FILTER, &r, &a, &match); 3867 } 3868 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3869 PF_RULESET_FILTER, &r, &a, &match)) 3870 break; 3871 } 3872 r = *rm; 3873 a = *am; 3874 ruleset = *rsm; 3875 3876 REASON_SET(&reason, PFRES_MATCH); 3877 3878 if (r->log) 3879 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 3880 pd); 3881 3882 if (r->action != PF_PASS) 3883 return (PF_DROP); 3884 3885 if (pf_tag_packet(m, tag, -1)) { 3886 REASON_SET(&reason, PFRES_MEMORY); 3887 return (PF_DROP); 3888 } 3889 3890 return (PF_PASS); 3891 } 3892 3893 int 3894 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3895 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3896 struct pf_pdesc *pd, u_short *reason, int *copyback) 3897 { 3898 struct tcphdr *th = pd->hdr.tcp; 3899 u_int16_t win = ntohs(th->th_win); 3900 u_int32_t ack, end, seq, orig_seq; 3901 u_int8_t sws, dws; 3902 int ackskew; 3903 3904 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3905 sws = src->wscale & PF_WSCALE_MASK; 3906 dws = dst->wscale & PF_WSCALE_MASK; 3907 } else 3908 sws = dws = 0; 3909 3910 /* 3911 * Sequence tracking algorithm from Guido van Rooij's paper: 3912 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3913 * tcp_filtering.ps 3914 */ 3915 3916 orig_seq = seq = ntohl(th->th_seq); 3917 if (src->seqlo == 0) { 3918 /* First packet from this end. Set its state */ 3919 3920 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3921 src->scrub == NULL) { 3922 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3923 REASON_SET(reason, PFRES_MEMORY); 3924 return (PF_DROP); 3925 } 3926 } 3927 3928 /* Deferred generation of sequence number modulator */ 3929 if (dst->seqdiff && !src->seqdiff) { 3930 /* use random iss for the TCP server */ 3931 while ((src->seqdiff = karc4random() - seq) == 0) 3932 ; 3933 ack = ntohl(th->th_ack) - dst->seqdiff; 3934 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3935 src->seqdiff), 0); 3936 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3937 *copyback = 1; 3938 } else { 3939 ack = ntohl(th->th_ack); 3940 } 3941 3942 end = seq + pd->p_len; 3943 if (th->th_flags & TH_SYN) { 3944 end++; 3945 (*state)->sync_flags |= PFSTATE_GOT_SYN2; 3946 if (dst->wscale & PF_WSCALE_FLAG) { 3947 src->wscale = pf_get_wscale(m, off, th->th_off, 3948 pd->af); 3949 if (src->wscale & PF_WSCALE_FLAG) { 3950 /* Remove scale factor from initial 3951 * window */ 3952 sws = src->wscale & PF_WSCALE_MASK; 3953 win = ((u_int32_t)win + (1 << sws) - 1) 3954 >> sws; 3955 dws = dst->wscale & PF_WSCALE_MASK; 3956 } else { 3957 /* fixup other window */ 3958 dst->max_win <<= dst->wscale & 3959 PF_WSCALE_MASK; 3960 /* in case of a retrans SYN|ACK */ 3961 dst->wscale = 0; 3962 } 3963 } 3964 } 3965 if (th->th_flags & TH_FIN) 3966 end++; 3967 3968 src->seqlo = seq; 3969 if (src->state < TCPS_SYN_SENT) 3970 src->state = TCPS_SYN_SENT; 3971 3972 /* 3973 * May need to slide the window (seqhi may have been set by 3974 * the crappy stack check or if we picked up the connection 3975 * after establishment) 3976 */ 3977 if (src->seqhi == 1 || 3978 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3979 src->seqhi = end + MAX(1, dst->max_win << dws); 3980 if (win > src->max_win) 3981 src->max_win = win; 3982 3983 } else { 3984 ack = ntohl(th->th_ack) - dst->seqdiff; 3985 if (src->seqdiff) { 3986 /* Modulate sequence numbers */ 3987 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3988 src->seqdiff), 0); 3989 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3990 *copyback = 1; 3991 } 3992 end = seq + pd->p_len; 3993 if (th->th_flags & TH_SYN) 3994 end++; 3995 if (th->th_flags & TH_FIN) 3996 end++; 3997 } 3998 3999 if ((th->th_flags & TH_ACK) == 0) { 4000 /* Let it pass through the ack skew check */ 4001 ack = dst->seqlo; 4002 } else if ((ack == 0 && 4003 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4004 /* broken tcp stacks do not set ack */ 4005 (dst->state < TCPS_SYN_SENT)) { 4006 /* 4007 * Many stacks (ours included) will set the ACK number in an 4008 * FIN|ACK if the SYN times out -- no sequence to ACK. 4009 */ 4010 ack = dst->seqlo; 4011 } 4012 4013 if (seq == end) { 4014 /* Ease sequencing restrictions on no data packets */ 4015 seq = src->seqlo; 4016 end = seq; 4017 } 4018 4019 ackskew = dst->seqlo - ack; 4020 4021 4022 /* 4023 * Need to demodulate the sequence numbers in any TCP SACK options 4024 * (Selective ACK). We could optionally validate the SACK values 4025 * against the current ACK window, either forwards or backwards, but 4026 * I'm not confident that SACK has been implemented properly 4027 * everywhere. It wouldn't surprise me if several stacks accidently 4028 * SACK too far backwards of previously ACKed data. There really aren't 4029 * any security implications of bad SACKing unless the target stack 4030 * doesn't validate the option length correctly. Someone trying to 4031 * spoof into a TCP connection won't bother blindly sending SACK 4032 * options anyway. 4033 */ 4034 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4035 if (pf_modulate_sack(m, off, pd, th, dst)) 4036 *copyback = 1; 4037 } 4038 4039 4040 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4041 if (SEQ_GEQ(src->seqhi, end) && 4042 /* Last octet inside other's window space */ 4043 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4044 /* Retrans: not more than one window back */ 4045 (ackskew >= -MAXACKWINDOW) && 4046 /* Acking not more than one reassembled fragment backwards */ 4047 (ackskew <= (MAXACKWINDOW << sws)) && 4048 /* Acking not more than one window forward */ 4049 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4050 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4051 (pd->flags & PFDESC_IP_REAS) == 0)) { 4052 /* Require an exact/+1 sequence match on resets when possible */ 4053 4054 if (dst->scrub || src->scrub) { 4055 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4056 *state, src, dst, copyback)) 4057 return (PF_DROP); 4058 } 4059 4060 /* update max window */ 4061 if (src->max_win < win) 4062 src->max_win = win; 4063 /* synchronize sequencing */ 4064 if (SEQ_GT(end, src->seqlo)) 4065 src->seqlo = end; 4066 /* slide the window of what the other end can send */ 4067 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4068 dst->seqhi = ack + MAX((win << sws), 1); 4069 4070 4071 /* update states */ 4072 if (th->th_flags & TH_SYN) 4073 if (src->state < TCPS_SYN_SENT) 4074 src->state = TCPS_SYN_SENT; 4075 if (th->th_flags & TH_FIN) 4076 if (src->state < TCPS_CLOSING) 4077 src->state = TCPS_CLOSING; 4078 if (th->th_flags & TH_ACK) { 4079 if (dst->state == TCPS_SYN_SENT) { 4080 dst->state = TCPS_ESTABLISHED; 4081 if (src->state == TCPS_ESTABLISHED && 4082 (*state)->src_node != NULL && 4083 pf_src_connlimit(state)) { 4084 REASON_SET(reason, PFRES_SRCLIMIT); 4085 return (PF_DROP); 4086 } 4087 } else if (dst->state == TCPS_CLOSING) 4088 dst->state = TCPS_FIN_WAIT_2; 4089 } 4090 if (th->th_flags & TH_RST) 4091 src->state = dst->state = TCPS_TIME_WAIT; 4092 4093 /* update expire time */ 4094 (*state)->expire = time_second; 4095 if (src->state >= TCPS_FIN_WAIT_2 && 4096 dst->state >= TCPS_FIN_WAIT_2) 4097 (*state)->timeout = PFTM_TCP_CLOSED; 4098 else if (src->state >= TCPS_CLOSING && 4099 dst->state >= TCPS_CLOSING) 4100 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4101 else if (src->state < TCPS_ESTABLISHED || 4102 dst->state < TCPS_ESTABLISHED) 4103 (*state)->timeout = PFTM_TCP_OPENING; 4104 else if (src->state >= TCPS_CLOSING || 4105 dst->state >= TCPS_CLOSING) 4106 (*state)->timeout = PFTM_TCP_CLOSING; 4107 else 4108 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4109 4110 /* Fall through to PASS packet */ 4111 4112 } else if ((dst->state < TCPS_SYN_SENT || 4113 dst->state >= TCPS_FIN_WAIT_2 || 4114 src->state >= TCPS_FIN_WAIT_2) && 4115 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4116 /* Within a window forward of the originating packet */ 4117 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4118 /* Within a window backward of the originating packet */ 4119 4120 /* 4121 * This currently handles three situations: 4122 * 1) Stupid stacks will shotgun SYNs before their peer 4123 * replies. 4124 * 2) When PF catches an already established stream (the 4125 * firewall rebooted, the state table was flushed, routes 4126 * changed...) 4127 * 3) Packets get funky immediately after the connection 4128 * closes (this should catch Solaris spurious ACK|FINs 4129 * that web servers like to spew after a close) 4130 * 4131 * This must be a little more careful than the above code 4132 * since packet floods will also be caught here. We don't 4133 * update the TTL here to mitigate the damage of a packet 4134 * flood and so the same code can handle awkward establishment 4135 * and a loosened connection close. 4136 * In the establishment case, a correct peer response will 4137 * validate the connection, go through the normal state code 4138 * and keep updating the state TTL. 4139 */ 4140 4141 if (pf_status.debug >= PF_DEBUG_MISC) { 4142 kprintf("pf: loose state match: "); 4143 pf_print_state(*state); 4144 pf_print_flags(th->th_flags); 4145 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4146 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len, 4147 ackskew, (unsigned long long)(*state)->packets[0], 4148 (unsigned long long)(*state)->packets[1], 4149 pd->dir == PF_IN ? "in" : "out", 4150 pd->dir == (*state)->direction ? "fwd" : "rev"); 4151 } 4152 4153 if (dst->scrub || src->scrub) { 4154 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4155 *state, src, dst, copyback)) 4156 return (PF_DROP); 4157 } 4158 4159 /* update max window */ 4160 if (src->max_win < win) 4161 src->max_win = win; 4162 /* synchronize sequencing */ 4163 if (SEQ_GT(end, src->seqlo)) 4164 src->seqlo = end; 4165 /* slide the window of what the other end can send */ 4166 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4167 dst->seqhi = ack + MAX((win << sws), 1); 4168 4169 /* 4170 * Cannot set dst->seqhi here since this could be a shotgunned 4171 * SYN and not an already established connection. 4172 */ 4173 4174 if (th->th_flags & TH_FIN) 4175 if (src->state < TCPS_CLOSING) 4176 src->state = TCPS_CLOSING; 4177 if (th->th_flags & TH_RST) 4178 src->state = dst->state = TCPS_TIME_WAIT; 4179 4180 /* Fall through to PASS packet */ 4181 4182 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY || 4183 ((*state)->pickup_mode == PF_PICKUPS_ENABLED && 4184 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) != 4185 PFSTATE_GOT_SYN_MASK)) { 4186 /* 4187 * If pickup mode is hash only, do not fail on sequence checks. 4188 * 4189 * If pickup mode is enabled and we did not see the SYN in 4190 * both direction, do not fail on sequence checks because 4191 * we do not have complete information on window scale. 4192 * 4193 * Adjust expiration and fall through to PASS packet. 4194 * XXX Add a FIN check to reduce timeout? 4195 */ 4196 (*state)->expire = time_second; 4197 } else { 4198 /* 4199 * Failure processing 4200 */ 4201 if ((*state)->dst.state == TCPS_SYN_SENT && 4202 (*state)->src.state == TCPS_SYN_SENT) { 4203 /* Send RST for state mismatches during handshake */ 4204 if (!(th->th_flags & TH_RST)) 4205 pf_send_tcp((*state)->rule.ptr, pd->af, 4206 pd->dst, pd->src, th->th_dport, 4207 th->th_sport, ntohl(th->th_ack), 0, 4208 TH_RST, 0, 0, 4209 (*state)->rule.ptr->return_ttl, 1, 0, 4210 pd->eh, kif->pfik_ifp); 4211 src->seqlo = 0; 4212 src->seqhi = 1; 4213 src->max_win = 1; 4214 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4215 kprintf("pf: BAD state: "); 4216 pf_print_state(*state); 4217 pf_print_flags(th->th_flags); 4218 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4219 "pkts=%llu:%llu dir=%s,%s\n", 4220 seq, orig_seq, ack, pd->p_len, ackskew, 4221 (unsigned long long)(*state)->packets[0], 4222 (unsigned long long)(*state)->packets[1], 4223 pd->dir == PF_IN ? "in" : "out", 4224 pd->dir == (*state)->direction ? "fwd" : "rev"); 4225 kprintf("pf: State failure on: %c %c %c %c | %c %c\n", 4226 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4227 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4228 ' ': '2', 4229 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4230 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4231 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4232 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4233 } 4234 REASON_SET(reason, PFRES_BADSTATE); 4235 return (PF_DROP); 4236 } 4237 4238 return (PF_PASS); 4239 } 4240 4241 int 4242 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4243 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4244 { 4245 struct tcphdr *th = pd->hdr.tcp; 4246 4247 if (th->th_flags & TH_SYN) 4248 if (src->state < TCPS_SYN_SENT) 4249 src->state = TCPS_SYN_SENT; 4250 if (th->th_flags & TH_FIN) 4251 if (src->state < TCPS_CLOSING) 4252 src->state = TCPS_CLOSING; 4253 if (th->th_flags & TH_ACK) { 4254 if (dst->state == TCPS_SYN_SENT) { 4255 dst->state = TCPS_ESTABLISHED; 4256 if (src->state == TCPS_ESTABLISHED && 4257 (*state)->src_node != NULL && 4258 pf_src_connlimit(state)) { 4259 REASON_SET(reason, PFRES_SRCLIMIT); 4260 return (PF_DROP); 4261 } 4262 } else if (dst->state == TCPS_CLOSING) { 4263 dst->state = TCPS_FIN_WAIT_2; 4264 } else if (src->state == TCPS_SYN_SENT && 4265 dst->state < TCPS_SYN_SENT) { 4266 /* 4267 * Handle a special sloppy case where we only see one 4268 * half of the connection. If there is a ACK after 4269 * the initial SYN without ever seeing a packet from 4270 * the destination, set the connection to established. 4271 */ 4272 dst->state = src->state = TCPS_ESTABLISHED; 4273 if ((*state)->src_node != NULL && 4274 pf_src_connlimit(state)) { 4275 REASON_SET(reason, PFRES_SRCLIMIT); 4276 return (PF_DROP); 4277 } 4278 } else if (src->state == TCPS_CLOSING && 4279 dst->state == TCPS_ESTABLISHED && 4280 dst->seqlo == 0) { 4281 /* 4282 * Handle the closing of half connections where we 4283 * don't see the full bidirectional FIN/ACK+ACK 4284 * handshake. 4285 */ 4286 dst->state = TCPS_CLOSING; 4287 } 4288 } 4289 if (th->th_flags & TH_RST) 4290 src->state = dst->state = TCPS_TIME_WAIT; 4291 4292 /* update expire time */ 4293 (*state)->expire = time_second; 4294 if (src->state >= TCPS_FIN_WAIT_2 && 4295 dst->state >= TCPS_FIN_WAIT_2) 4296 (*state)->timeout = PFTM_TCP_CLOSED; 4297 else if (src->state >= TCPS_CLOSING && 4298 dst->state >= TCPS_CLOSING) 4299 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4300 else if (src->state < TCPS_ESTABLISHED || 4301 dst->state < TCPS_ESTABLISHED) 4302 (*state)->timeout = PFTM_TCP_OPENING; 4303 else if (src->state >= TCPS_CLOSING || 4304 dst->state >= TCPS_CLOSING) 4305 (*state)->timeout = PFTM_TCP_CLOSING; 4306 else 4307 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4308 4309 return (PF_PASS); 4310 } 4311 4312 int 4313 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4314 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4315 u_short *reason) 4316 { 4317 struct pf_state_key_cmp key; 4318 struct tcphdr *th = pd->hdr.tcp; 4319 int copyback = 0; 4320 struct pf_state_peer *src, *dst; 4321 struct pf_state_key *sk; 4322 4323 key.af = pd->af; 4324 key.proto = IPPROTO_TCP; 4325 if (direction == PF_IN) { /* wire side, straight */ 4326 PF_ACPY(&key.addr[0], pd->src, key.af); 4327 PF_ACPY(&key.addr[1], pd->dst, key.af); 4328 key.port[0] = th->th_sport; 4329 key.port[1] = th->th_dport; 4330 } else { /* stack side, reverse */ 4331 PF_ACPY(&key.addr[1], pd->src, key.af); 4332 PF_ACPY(&key.addr[0], pd->dst, key.af); 4333 key.port[1] = th->th_sport; 4334 key.port[0] = th->th_dport; 4335 } 4336 4337 STATE_LOOKUP(kif, &key, direction, *state, m); 4338 4339 if (direction == (*state)->direction) { 4340 src = &(*state)->src; 4341 dst = &(*state)->dst; 4342 } else { 4343 src = &(*state)->dst; 4344 dst = &(*state)->src; 4345 } 4346 4347 sk = (*state)->key[pd->didx]; 4348 4349 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4350 if (direction != (*state)->direction) { 4351 REASON_SET(reason, PFRES_SYNPROXY); 4352 return (PF_SYNPROXY_DROP); 4353 } 4354 if (th->th_flags & TH_SYN) { 4355 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4356 REASON_SET(reason, PFRES_SYNPROXY); 4357 return (PF_DROP); 4358 } 4359 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4360 pd->src, th->th_dport, th->th_sport, 4361 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4362 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4363 0, NULL, NULL); 4364 REASON_SET(reason, PFRES_SYNPROXY); 4365 return (PF_SYNPROXY_DROP); 4366 } else if (!(th->th_flags & TH_ACK) || 4367 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4368 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4369 REASON_SET(reason, PFRES_SYNPROXY); 4370 return (PF_DROP); 4371 } else if ((*state)->src_node != NULL && 4372 pf_src_connlimit(state)) { 4373 REASON_SET(reason, PFRES_SRCLIMIT); 4374 return (PF_DROP); 4375 } else 4376 (*state)->src.state = PF_TCPS_PROXY_DST; 4377 } 4378 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4379 if (direction == (*state)->direction) { 4380 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4381 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4382 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4383 REASON_SET(reason, PFRES_SYNPROXY); 4384 return (PF_DROP); 4385 } 4386 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4387 if ((*state)->dst.seqhi == 1) 4388 (*state)->dst.seqhi = htonl(karc4random()); 4389 pf_send_tcp((*state)->rule.ptr, pd->af, 4390 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4391 sk->port[pd->sidx], sk->port[pd->didx], 4392 (*state)->dst.seqhi, 0, TH_SYN, 0, 4393 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4394 REASON_SET(reason, PFRES_SYNPROXY); 4395 return (PF_SYNPROXY_DROP); 4396 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4397 (TH_SYN|TH_ACK)) || 4398 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4399 REASON_SET(reason, PFRES_SYNPROXY); 4400 return (PF_DROP); 4401 } else { 4402 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4403 (*state)->dst.seqlo = ntohl(th->th_seq); 4404 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4405 pd->src, th->th_dport, th->th_sport, 4406 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4407 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4408 (*state)->tag, NULL, NULL); 4409 pf_send_tcp((*state)->rule.ptr, pd->af, 4410 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4411 sk->port[pd->sidx], sk->port[pd->didx], 4412 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4413 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4414 0, NULL, NULL); 4415 (*state)->src.seqdiff = (*state)->dst.seqhi - 4416 (*state)->src.seqlo; 4417 (*state)->dst.seqdiff = (*state)->src.seqhi - 4418 (*state)->dst.seqlo; 4419 (*state)->src.seqhi = (*state)->src.seqlo + 4420 (*state)->dst.max_win; 4421 (*state)->dst.seqhi = (*state)->dst.seqlo + 4422 (*state)->src.max_win; 4423 (*state)->src.wscale = (*state)->dst.wscale = 0; 4424 (*state)->src.state = (*state)->dst.state = 4425 TCPS_ESTABLISHED; 4426 REASON_SET(reason, PFRES_SYNPROXY); 4427 return (PF_SYNPROXY_DROP); 4428 } 4429 } 4430 4431 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4432 dst->state >= TCPS_FIN_WAIT_2 && 4433 src->state >= TCPS_FIN_WAIT_2) { 4434 if (pf_status.debug >= PF_DEBUG_MISC) { 4435 kprintf("pf: state reuse "); 4436 pf_print_state(*state); 4437 pf_print_flags(th->th_flags); 4438 kprintf("\n"); 4439 } 4440 /* XXX make sure it's the same direction ?? */ 4441 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4442 pf_unlink_state(*state); 4443 *state = NULL; 4444 return (PF_DROP); 4445 } 4446 4447 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4448 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4449 return (PF_DROP); 4450 } else { 4451 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4452 ©back) == PF_DROP) 4453 return (PF_DROP); 4454 } 4455 4456 /* translate source/destination address, if necessary */ 4457 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4458 struct pf_state_key *nk = (*state)->key[pd->didx]; 4459 4460 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4461 nk->port[pd->sidx] != th->th_sport) { 4462 /* 4463 * The translated source address may be completely 4464 * unrelated to the saved link header, make sure 4465 * a bridge doesn't try to use it. 4466 */ 4467 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 4468 m->m_flags &= ~M_HASH; 4469 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4470 &th->th_sum, &nk->addr[pd->sidx], 4471 nk->port[pd->sidx], 0, pd->af); 4472 } 4473 4474 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4475 nk->port[pd->didx] != th->th_dport) { 4476 /* 4477 * If we don't redispatch the packet will go into 4478 * the protocol stack on the wrong cpu for the 4479 * post-translated address. 4480 */ 4481 m->m_flags &= ~M_HASH; 4482 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4483 &th->th_sum, &nk->addr[pd->didx], 4484 nk->port[pd->didx], 0, pd->af); 4485 } 4486 copyback = 1; 4487 } 4488 4489 /* Copyback sequence modulation or stateful scrub changes if needed */ 4490 if (copyback) 4491 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4492 4493 return (PF_PASS); 4494 } 4495 4496 int 4497 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4498 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4499 { 4500 struct pf_state_peer *src, *dst; 4501 struct pf_state_key_cmp key; 4502 struct udphdr *uh = pd->hdr.udp; 4503 4504 key.af = pd->af; 4505 key.proto = IPPROTO_UDP; 4506 if (direction == PF_IN) { /* wire side, straight */ 4507 PF_ACPY(&key.addr[0], pd->src, key.af); 4508 PF_ACPY(&key.addr[1], pd->dst, key.af); 4509 key.port[0] = uh->uh_sport; 4510 key.port[1] = uh->uh_dport; 4511 } else { /* stack side, reverse */ 4512 PF_ACPY(&key.addr[1], pd->src, key.af); 4513 PF_ACPY(&key.addr[0], pd->dst, key.af); 4514 key.port[1] = uh->uh_sport; 4515 key.port[0] = uh->uh_dport; 4516 } 4517 4518 STATE_LOOKUP(kif, &key, direction, *state, m); 4519 4520 if (direction == (*state)->direction) { 4521 src = &(*state)->src; 4522 dst = &(*state)->dst; 4523 } else { 4524 src = &(*state)->dst; 4525 dst = &(*state)->src; 4526 } 4527 4528 /* update states */ 4529 if (src->state < PFUDPS_SINGLE) 4530 src->state = PFUDPS_SINGLE; 4531 if (dst->state == PFUDPS_SINGLE) 4532 dst->state = PFUDPS_MULTIPLE; 4533 4534 /* update expire time */ 4535 (*state)->expire = time_second; 4536 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4537 (*state)->timeout = PFTM_UDP_MULTIPLE; 4538 else 4539 (*state)->timeout = PFTM_UDP_SINGLE; 4540 4541 /* translate source/destination address, if necessary */ 4542 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4543 struct pf_state_key *nk = (*state)->key[pd->didx]; 4544 4545 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4546 nk->port[pd->sidx] != uh->uh_sport) { 4547 /* 4548 * The translated source address may be completely 4549 * unrelated to the saved link header, make sure 4550 * a bridge doesn't try to use it. 4551 */ 4552 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 4553 m->m_flags &= ~M_HASH; 4554 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4555 &uh->uh_sum, &nk->addr[pd->sidx], 4556 nk->port[pd->sidx], 1, pd->af); 4557 } 4558 4559 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4560 nk->port[pd->didx] != uh->uh_dport) { 4561 /* 4562 * If we don't redispatch the packet will go into 4563 * the protocol stack on the wrong cpu for the 4564 * post-translated address. 4565 */ 4566 m->m_flags &= ~M_HASH; 4567 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4568 &uh->uh_sum, &nk->addr[pd->didx], 4569 nk->port[pd->didx], 1, pd->af); 4570 } 4571 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4572 } 4573 4574 return (PF_PASS); 4575 } 4576 4577 int 4578 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4579 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4580 { 4581 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4582 u_int16_t icmpid = 0, *icmpsum; 4583 u_int8_t icmptype; 4584 int state_icmp = 0; 4585 struct pf_state_key_cmp key; 4586 4587 switch (pd->proto) { 4588 #ifdef INET 4589 case IPPROTO_ICMP: 4590 icmptype = pd->hdr.icmp->icmp_type; 4591 icmpid = pd->hdr.icmp->icmp_id; 4592 icmpsum = &pd->hdr.icmp->icmp_cksum; 4593 4594 if (icmptype == ICMP_UNREACH || 4595 icmptype == ICMP_SOURCEQUENCH || 4596 icmptype == ICMP_REDIRECT || 4597 icmptype == ICMP_TIMXCEED || 4598 icmptype == ICMP_PARAMPROB) 4599 state_icmp++; 4600 break; 4601 #endif /* INET */ 4602 #ifdef INET6 4603 case IPPROTO_ICMPV6: 4604 icmptype = pd->hdr.icmp6->icmp6_type; 4605 icmpid = pd->hdr.icmp6->icmp6_id; 4606 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4607 4608 if (icmptype == ICMP6_DST_UNREACH || 4609 icmptype == ICMP6_PACKET_TOO_BIG || 4610 icmptype == ICMP6_TIME_EXCEEDED || 4611 icmptype == ICMP6_PARAM_PROB) 4612 state_icmp++; 4613 break; 4614 #endif /* INET6 */ 4615 } 4616 4617 if (!state_icmp) { 4618 4619 /* 4620 * ICMP query/reply message not related to a TCP/UDP packet. 4621 * Search for an ICMP state. 4622 */ 4623 key.af = pd->af; 4624 key.proto = pd->proto; 4625 key.port[0] = key.port[1] = icmpid; 4626 if (direction == PF_IN) { /* wire side, straight */ 4627 PF_ACPY(&key.addr[0], pd->src, key.af); 4628 PF_ACPY(&key.addr[1], pd->dst, key.af); 4629 } else { /* stack side, reverse */ 4630 PF_ACPY(&key.addr[1], pd->src, key.af); 4631 PF_ACPY(&key.addr[0], pd->dst, key.af); 4632 } 4633 4634 STATE_LOOKUP(kif, &key, direction, *state, m); 4635 4636 (*state)->expire = time_second; 4637 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4638 4639 /* translate source/destination address, if necessary */ 4640 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4641 struct pf_state_key *nk = (*state)->key[pd->didx]; 4642 4643 switch (pd->af) { 4644 #ifdef INET 4645 case AF_INET: 4646 if (PF_ANEQ(pd->src, 4647 &nk->addr[pd->sidx], AF_INET)) 4648 pf_change_a(&saddr->v4.s_addr, 4649 pd->ip_sum, 4650 nk->addr[pd->sidx].v4.s_addr, 0); 4651 4652 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4653 AF_INET)) 4654 pf_change_a(&daddr->v4.s_addr, 4655 pd->ip_sum, 4656 nk->addr[pd->didx].v4.s_addr, 0); 4657 4658 if (nk->port[0] != 4659 pd->hdr.icmp->icmp_id) { 4660 pd->hdr.icmp->icmp_cksum = 4661 pf_cksum_fixup( 4662 pd->hdr.icmp->icmp_cksum, icmpid, 4663 nk->port[pd->sidx], 0); 4664 pd->hdr.icmp->icmp_id = 4665 nk->port[pd->sidx]; 4666 } 4667 4668 m_copyback(m, off, ICMP_MINLEN, 4669 (caddr_t)pd->hdr.icmp); 4670 break; 4671 #endif /* INET */ 4672 #ifdef INET6 4673 case AF_INET6: 4674 if (PF_ANEQ(pd->src, 4675 &nk->addr[pd->sidx], AF_INET6)) 4676 pf_change_a6(saddr, 4677 &pd->hdr.icmp6->icmp6_cksum, 4678 &nk->addr[pd->sidx], 0); 4679 4680 if (PF_ANEQ(pd->dst, 4681 &nk->addr[pd->didx], AF_INET6)) 4682 pf_change_a6(daddr, 4683 &pd->hdr.icmp6->icmp6_cksum, 4684 &nk->addr[pd->didx], 0); 4685 4686 m_copyback(m, off, 4687 sizeof(struct icmp6_hdr), 4688 (caddr_t)pd->hdr.icmp6); 4689 break; 4690 #endif /* INET6 */ 4691 } 4692 } 4693 return (PF_PASS); 4694 4695 } else { 4696 /* 4697 * ICMP error message in response to a TCP/UDP packet. 4698 * Extract the inner TCP/UDP header and search for that state. 4699 */ 4700 4701 struct pf_pdesc pd2; 4702 #ifdef INET 4703 struct ip h2; 4704 #endif /* INET */ 4705 #ifdef INET6 4706 struct ip6_hdr h2_6; 4707 int terminal = 0; 4708 #endif /* INET6 */ 4709 int ipoff2; 4710 int off2; 4711 4712 pd2.af = pd->af; 4713 /* Payload packet is from the opposite direction. */ 4714 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4715 pd2.didx = (direction == PF_IN) ? 0 : 1; 4716 switch (pd->af) { 4717 #ifdef INET 4718 case AF_INET: 4719 /* offset of h2 in mbuf chain */ 4720 ipoff2 = off + ICMP_MINLEN; 4721 4722 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4723 NULL, reason, pd2.af)) { 4724 DPFPRINTF(PF_DEBUG_MISC, 4725 ("pf: ICMP error message too short " 4726 "(ip)\n")); 4727 return (PF_DROP); 4728 } 4729 /* 4730 * ICMP error messages don't refer to non-first 4731 * fragments 4732 */ 4733 if (h2.ip_off & htons(IP_OFFMASK)) { 4734 REASON_SET(reason, PFRES_FRAG); 4735 return (PF_DROP); 4736 } 4737 4738 /* offset of protocol header that follows h2 */ 4739 off2 = ipoff2 + (h2.ip_hl << 2); 4740 4741 pd2.proto = h2.ip_p; 4742 pd2.src = (struct pf_addr *)&h2.ip_src; 4743 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4744 pd2.ip_sum = &h2.ip_sum; 4745 break; 4746 #endif /* INET */ 4747 #ifdef INET6 4748 case AF_INET6: 4749 ipoff2 = off + sizeof(struct icmp6_hdr); 4750 4751 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4752 NULL, reason, pd2.af)) { 4753 DPFPRINTF(PF_DEBUG_MISC, 4754 ("pf: ICMP error message too short " 4755 "(ip6)\n")); 4756 return (PF_DROP); 4757 } 4758 pd2.proto = h2_6.ip6_nxt; 4759 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4760 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4761 pd2.ip_sum = NULL; 4762 off2 = ipoff2 + sizeof(h2_6); 4763 do { 4764 switch (pd2.proto) { 4765 case IPPROTO_FRAGMENT: 4766 /* 4767 * ICMPv6 error messages for 4768 * non-first fragments 4769 */ 4770 REASON_SET(reason, PFRES_FRAG); 4771 return (PF_DROP); 4772 case IPPROTO_AH: 4773 case IPPROTO_HOPOPTS: 4774 case IPPROTO_ROUTING: 4775 case IPPROTO_DSTOPTS: { 4776 /* get next header and header length */ 4777 struct ip6_ext opt6; 4778 4779 if (!pf_pull_hdr(m, off2, &opt6, 4780 sizeof(opt6), NULL, reason, 4781 pd2.af)) { 4782 DPFPRINTF(PF_DEBUG_MISC, 4783 ("pf: ICMPv6 short opt\n")); 4784 return (PF_DROP); 4785 } 4786 if (pd2.proto == IPPROTO_AH) 4787 off2 += (opt6.ip6e_len + 2) * 4; 4788 else 4789 off2 += (opt6.ip6e_len + 1) * 8; 4790 pd2.proto = opt6.ip6e_nxt; 4791 /* goto the next header */ 4792 break; 4793 } 4794 default: 4795 terminal++; 4796 break; 4797 } 4798 } while (!terminal); 4799 break; 4800 #endif /* INET6 */ 4801 default: 4802 DPFPRINTF(PF_DEBUG_MISC, 4803 ("pf: ICMP AF %d unknown (ip6)\n", pd->af)); 4804 return (PF_DROP); 4805 break; 4806 } 4807 4808 switch (pd2.proto) { 4809 case IPPROTO_TCP: { 4810 struct tcphdr th; 4811 u_int32_t seq; 4812 struct pf_state_peer *src, *dst; 4813 u_int8_t dws; 4814 int copyback = 0; 4815 4816 /* 4817 * Only the first 8 bytes of the TCP header can be 4818 * expected. Don't access any TCP header fields after 4819 * th_seq, an ackskew test is not possible. 4820 */ 4821 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4822 pd2.af)) { 4823 DPFPRINTF(PF_DEBUG_MISC, 4824 ("pf: ICMP error message too short " 4825 "(tcp)\n")); 4826 return (PF_DROP); 4827 } 4828 4829 key.af = pd2.af; 4830 key.proto = IPPROTO_TCP; 4831 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4832 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4833 key.port[pd2.sidx] = th.th_sport; 4834 key.port[pd2.didx] = th.th_dport; 4835 4836 STATE_LOOKUP(kif, &key, direction, *state, m); 4837 4838 if (direction == (*state)->direction) { 4839 src = &(*state)->dst; 4840 dst = &(*state)->src; 4841 } else { 4842 src = &(*state)->src; 4843 dst = &(*state)->dst; 4844 } 4845 4846 if (src->wscale && dst->wscale) 4847 dws = dst->wscale & PF_WSCALE_MASK; 4848 else 4849 dws = 0; 4850 4851 /* Demodulate sequence number */ 4852 seq = ntohl(th.th_seq) - src->seqdiff; 4853 if (src->seqdiff) { 4854 pf_change_a(&th.th_seq, icmpsum, 4855 htonl(seq), 0); 4856 copyback = 1; 4857 } 4858 4859 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4860 (!SEQ_GEQ(src->seqhi, seq) || 4861 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4862 if (pf_status.debug >= PF_DEBUG_MISC) { 4863 kprintf("pf: BAD ICMP %d:%d ", 4864 icmptype, pd->hdr.icmp->icmp_code); 4865 pf_print_host(pd->src, 0, pd->af); 4866 kprintf(" -> "); 4867 pf_print_host(pd->dst, 0, pd->af); 4868 kprintf(" state: "); 4869 pf_print_state(*state); 4870 kprintf(" seq=%u\n", seq); 4871 } 4872 REASON_SET(reason, PFRES_BADSTATE); 4873 return (PF_DROP); 4874 } else { 4875 if (pf_status.debug >= PF_DEBUG_MISC) { 4876 kprintf("pf: OK ICMP %d:%d ", 4877 icmptype, pd->hdr.icmp->icmp_code); 4878 pf_print_host(pd->src, 0, pd->af); 4879 kprintf(" -> "); 4880 pf_print_host(pd->dst, 0, pd->af); 4881 kprintf(" state: "); 4882 pf_print_state(*state); 4883 kprintf(" seq=%u\n", seq); 4884 } 4885 } 4886 4887 /* translate source/destination address, if necessary */ 4888 if ((*state)->key[PF_SK_WIRE] != 4889 (*state)->key[PF_SK_STACK]) { 4890 struct pf_state_key *nk = 4891 (*state)->key[pd->didx]; 4892 4893 if (PF_ANEQ(pd2.src, 4894 &nk->addr[pd2.sidx], pd2.af) || 4895 nk->port[pd2.sidx] != th.th_sport) 4896 pf_change_icmp(pd2.src, &th.th_sport, 4897 daddr, &nk->addr[pd2.sidx], 4898 nk->port[pd2.sidx], NULL, 4899 pd2.ip_sum, icmpsum, 4900 pd->ip_sum, 0, pd2.af); 4901 4902 if (PF_ANEQ(pd2.dst, 4903 &nk->addr[pd2.didx], pd2.af) || 4904 nk->port[pd2.didx] != th.th_dport) 4905 pf_change_icmp(pd2.dst, &th.th_dport, 4906 NULL, /* XXX Inbound NAT? */ 4907 &nk->addr[pd2.didx], 4908 nk->port[pd2.didx], NULL, 4909 pd2.ip_sum, icmpsum, 4910 pd->ip_sum, 0, pd2.af); 4911 copyback = 1; 4912 } 4913 4914 if (copyback) { 4915 switch (pd2.af) { 4916 #ifdef INET 4917 case AF_INET: 4918 m_copyback(m, off, ICMP_MINLEN, 4919 (caddr_t)pd->hdr.icmp); 4920 m_copyback(m, ipoff2, sizeof(h2), 4921 (caddr_t)&h2); 4922 break; 4923 #endif /* INET */ 4924 #ifdef INET6 4925 case AF_INET6: 4926 m_copyback(m, off, 4927 sizeof(struct icmp6_hdr), 4928 (caddr_t)pd->hdr.icmp6); 4929 m_copyback(m, ipoff2, sizeof(h2_6), 4930 (caddr_t)&h2_6); 4931 break; 4932 #endif /* INET6 */ 4933 } 4934 m_copyback(m, off2, 8, (caddr_t)&th); 4935 } 4936 4937 return (PF_PASS); 4938 break; 4939 } 4940 case IPPROTO_UDP: { 4941 struct udphdr uh; 4942 4943 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4944 NULL, reason, pd2.af)) { 4945 DPFPRINTF(PF_DEBUG_MISC, 4946 ("pf: ICMP error message too short " 4947 "(udp)\n")); 4948 return (PF_DROP); 4949 } 4950 4951 key.af = pd2.af; 4952 key.proto = IPPROTO_UDP; 4953 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4954 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4955 key.port[pd2.sidx] = uh.uh_sport; 4956 key.port[pd2.didx] = uh.uh_dport; 4957 4958 STATE_LOOKUP(kif, &key, direction, *state, m); 4959 4960 /* translate source/destination address, if necessary */ 4961 if ((*state)->key[PF_SK_WIRE] != 4962 (*state)->key[PF_SK_STACK]) { 4963 struct pf_state_key *nk = 4964 (*state)->key[pd->didx]; 4965 4966 if (PF_ANEQ(pd2.src, 4967 &nk->addr[pd2.sidx], pd2.af) || 4968 nk->port[pd2.sidx] != uh.uh_sport) 4969 pf_change_icmp(pd2.src, &uh.uh_sport, 4970 daddr, &nk->addr[pd2.sidx], 4971 nk->port[pd2.sidx], &uh.uh_sum, 4972 pd2.ip_sum, icmpsum, 4973 pd->ip_sum, 1, pd2.af); 4974 4975 if (PF_ANEQ(pd2.dst, 4976 &nk->addr[pd2.didx], pd2.af) || 4977 nk->port[pd2.didx] != uh.uh_dport) 4978 pf_change_icmp(pd2.dst, &uh.uh_dport, 4979 NULL, /* XXX Inbound NAT? */ 4980 &nk->addr[pd2.didx], 4981 nk->port[pd2.didx], &uh.uh_sum, 4982 pd2.ip_sum, icmpsum, 4983 pd->ip_sum, 1, pd2.af); 4984 4985 switch (pd2.af) { 4986 #ifdef INET 4987 case AF_INET: 4988 m_copyback(m, off, ICMP_MINLEN, 4989 (caddr_t)pd->hdr.icmp); 4990 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4991 break; 4992 #endif /* INET */ 4993 #ifdef INET6 4994 case AF_INET6: 4995 m_copyback(m, off, 4996 sizeof(struct icmp6_hdr), 4997 (caddr_t)pd->hdr.icmp6); 4998 m_copyback(m, ipoff2, sizeof(h2_6), 4999 (caddr_t)&h2_6); 5000 break; 5001 #endif /* INET6 */ 5002 } 5003 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 5004 } 5005 5006 return (PF_PASS); 5007 break; 5008 } 5009 #ifdef INET 5010 case IPPROTO_ICMP: { 5011 struct icmp iih; 5012 5013 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5014 NULL, reason, pd2.af)) { 5015 DPFPRINTF(PF_DEBUG_MISC, 5016 ("pf: ICMP error message too short i" 5017 "(icmp)\n")); 5018 return (PF_DROP); 5019 } 5020 5021 key.af = pd2.af; 5022 key.proto = IPPROTO_ICMP; 5023 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5024 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5025 key.port[0] = key.port[1] = iih.icmp_id; 5026 5027 STATE_LOOKUP(kif, &key, direction, *state, m); 5028 5029 /* translate source/destination address, if necessary */ 5030 if ((*state)->key[PF_SK_WIRE] != 5031 (*state)->key[PF_SK_STACK]) { 5032 struct pf_state_key *nk = 5033 (*state)->key[pd->didx]; 5034 5035 if (PF_ANEQ(pd2.src, 5036 &nk->addr[pd2.sidx], pd2.af) || 5037 nk->port[pd2.sidx] != iih.icmp_id) 5038 pf_change_icmp(pd2.src, &iih.icmp_id, 5039 daddr, &nk->addr[pd2.sidx], 5040 nk->port[pd2.sidx], NULL, 5041 pd2.ip_sum, icmpsum, 5042 pd->ip_sum, 0, AF_INET); 5043 5044 if (PF_ANEQ(pd2.dst, 5045 &nk->addr[pd2.didx], pd2.af) || 5046 nk->port[pd2.didx] != iih.icmp_id) 5047 pf_change_icmp(pd2.dst, &iih.icmp_id, 5048 NULL, /* XXX Inbound NAT? */ 5049 &nk->addr[pd2.didx], 5050 nk->port[pd2.didx], NULL, 5051 pd2.ip_sum, icmpsum, 5052 pd->ip_sum, 0, AF_INET); 5053 5054 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 5055 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5056 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 5057 } 5058 return (PF_PASS); 5059 break; 5060 } 5061 #endif /* INET */ 5062 #ifdef INET6 5063 case IPPROTO_ICMPV6: { 5064 struct icmp6_hdr iih; 5065 5066 if (!pf_pull_hdr(m, off2, &iih, 5067 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5068 DPFPRINTF(PF_DEBUG_MISC, 5069 ("pf: ICMP error message too short " 5070 "(icmp6)\n")); 5071 return (PF_DROP); 5072 } 5073 5074 key.af = pd2.af; 5075 key.proto = IPPROTO_ICMPV6; 5076 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5077 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5078 key.port[0] = key.port[1] = iih.icmp6_id; 5079 5080 STATE_LOOKUP(kif, &key, direction, *state, m); 5081 5082 /* translate source/destination address, if necessary */ 5083 if ((*state)->key[PF_SK_WIRE] != 5084 (*state)->key[PF_SK_STACK]) { 5085 struct pf_state_key *nk = 5086 (*state)->key[pd->didx]; 5087 5088 if (PF_ANEQ(pd2.src, 5089 &nk->addr[pd2.sidx], pd2.af) || 5090 nk->port[pd2.sidx] != iih.icmp6_id) 5091 pf_change_icmp(pd2.src, &iih.icmp6_id, 5092 daddr, &nk->addr[pd2.sidx], 5093 nk->port[pd2.sidx], NULL, 5094 pd2.ip_sum, icmpsum, 5095 pd->ip_sum, 0, AF_INET6); 5096 5097 if (PF_ANEQ(pd2.dst, 5098 &nk->addr[pd2.didx], pd2.af) || 5099 nk->port[pd2.didx] != iih.icmp6_id) 5100 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5101 NULL, /* XXX Inbound NAT? */ 5102 &nk->addr[pd2.didx], 5103 nk->port[pd2.didx], NULL, 5104 pd2.ip_sum, icmpsum, 5105 pd->ip_sum, 0, AF_INET6); 5106 5107 m_copyback(m, off, sizeof(struct icmp6_hdr), 5108 (caddr_t)pd->hdr.icmp6); 5109 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5110 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5111 (caddr_t)&iih); 5112 } 5113 5114 return (PF_PASS); 5115 break; 5116 } 5117 #endif /* INET6 */ 5118 default: { 5119 key.af = pd2.af; 5120 key.proto = pd2.proto; 5121 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5122 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5123 key.port[0] = key.port[1] = 0; 5124 5125 STATE_LOOKUP(kif, &key, direction, *state, m); 5126 5127 /* translate source/destination address, if necessary */ 5128 if ((*state)->key[PF_SK_WIRE] != 5129 (*state)->key[PF_SK_STACK]) { 5130 struct pf_state_key *nk = 5131 (*state)->key[pd->didx]; 5132 5133 if (PF_ANEQ(pd2.src, 5134 &nk->addr[pd2.sidx], pd2.af)) 5135 pf_change_icmp(pd2.src, NULL, daddr, 5136 &nk->addr[pd2.sidx], 0, NULL, 5137 pd2.ip_sum, icmpsum, 5138 pd->ip_sum, 0, pd2.af); 5139 5140 if (PF_ANEQ(pd2.dst, 5141 &nk->addr[pd2.didx], pd2.af)) 5142 pf_change_icmp(pd2.src, NULL, 5143 NULL, /* XXX Inbound NAT? */ 5144 &nk->addr[pd2.didx], 0, NULL, 5145 pd2.ip_sum, icmpsum, 5146 pd->ip_sum, 0, pd2.af); 5147 5148 switch (pd2.af) { 5149 #ifdef INET 5150 case AF_INET: 5151 m_copyback(m, off, ICMP_MINLEN, 5152 (caddr_t)pd->hdr.icmp); 5153 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5154 break; 5155 #endif /* INET */ 5156 #ifdef INET6 5157 case AF_INET6: 5158 m_copyback(m, off, 5159 sizeof(struct icmp6_hdr), 5160 (caddr_t)pd->hdr.icmp6); 5161 m_copyback(m, ipoff2, sizeof(h2_6), 5162 (caddr_t)&h2_6); 5163 break; 5164 #endif /* INET6 */ 5165 } 5166 } 5167 return (PF_PASS); 5168 break; 5169 } 5170 } 5171 } 5172 } 5173 5174 int 5175 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5176 struct mbuf *m, struct pf_pdesc *pd) 5177 { 5178 struct pf_state_peer *src, *dst; 5179 struct pf_state_key_cmp key; 5180 5181 key.af = pd->af; 5182 key.proto = pd->proto; 5183 if (direction == PF_IN) { 5184 PF_ACPY(&key.addr[0], pd->src, key.af); 5185 PF_ACPY(&key.addr[1], pd->dst, key.af); 5186 key.port[0] = key.port[1] = 0; 5187 } else { 5188 PF_ACPY(&key.addr[1], pd->src, key.af); 5189 PF_ACPY(&key.addr[0], pd->dst, key.af); 5190 key.port[1] = key.port[0] = 0; 5191 } 5192 5193 STATE_LOOKUP(kif, &key, direction, *state, m); 5194 5195 if (direction == (*state)->direction) { 5196 src = &(*state)->src; 5197 dst = &(*state)->dst; 5198 } else { 5199 src = &(*state)->dst; 5200 dst = &(*state)->src; 5201 } 5202 5203 /* update states */ 5204 if (src->state < PFOTHERS_SINGLE) 5205 src->state = PFOTHERS_SINGLE; 5206 if (dst->state == PFOTHERS_SINGLE) 5207 dst->state = PFOTHERS_MULTIPLE; 5208 5209 /* update expire time */ 5210 (*state)->expire = time_second; 5211 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5212 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5213 else 5214 (*state)->timeout = PFTM_OTHER_SINGLE; 5215 5216 /* translate source/destination address, if necessary */ 5217 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5218 struct pf_state_key *nk = (*state)->key[pd->didx]; 5219 5220 KKASSERT(nk); 5221 KKASSERT(pd); 5222 KKASSERT(pd->src); 5223 KKASSERT(pd->dst); 5224 switch (pd->af) { 5225 #ifdef INET 5226 case AF_INET: 5227 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5228 pf_change_a(&pd->src->v4.s_addr, 5229 pd->ip_sum, 5230 nk->addr[pd->sidx].v4.s_addr, 5231 0); 5232 5233 5234 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5235 pf_change_a(&pd->dst->v4.s_addr, 5236 pd->ip_sum, 5237 nk->addr[pd->didx].v4.s_addr, 5238 0); 5239 5240 break; 5241 #endif /* INET */ 5242 #ifdef INET6 5243 case AF_INET6: 5244 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5245 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5246 5247 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5248 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5249 #endif /* INET6 */ 5250 } 5251 } 5252 return (PF_PASS); 5253 } 5254 5255 /* 5256 * ipoff and off are measured from the start of the mbuf chain. 5257 * h must be at "ipoff" on the mbuf chain. 5258 */ 5259 void * 5260 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5261 u_short *actionp, u_short *reasonp, sa_family_t af) 5262 { 5263 switch (af) { 5264 #ifdef INET 5265 case AF_INET: { 5266 struct ip *h = mtod(m, struct ip *); 5267 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3; 5268 5269 if (fragoff) { 5270 if (fragoff >= len) 5271 ACTION_SET(actionp, PF_PASS); 5272 else { 5273 ACTION_SET(actionp, PF_DROP); 5274 REASON_SET(reasonp, PFRES_FRAG); 5275 } 5276 return (NULL); 5277 } 5278 if (m->m_pkthdr.len < off + len || 5279 h->ip_len < off + len) { 5280 ACTION_SET(actionp, PF_DROP); 5281 REASON_SET(reasonp, PFRES_SHORT); 5282 return (NULL); 5283 } 5284 break; 5285 } 5286 #endif /* INET */ 5287 #ifdef INET6 5288 case AF_INET6: { 5289 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5290 5291 if (m->m_pkthdr.len < off + len || 5292 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5293 (unsigned)(off + len)) { 5294 ACTION_SET(actionp, PF_DROP); 5295 REASON_SET(reasonp, PFRES_SHORT); 5296 return (NULL); 5297 } 5298 break; 5299 } 5300 #endif /* INET6 */ 5301 } 5302 m_copydata(m, off, len, p); 5303 return (p); 5304 } 5305 5306 int 5307 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5308 { 5309 struct sockaddr_in *dst; 5310 int ret = 1; 5311 int check_mpath; 5312 #ifdef INET6 5313 struct sockaddr_in6 *dst6; 5314 struct route_in6 ro; 5315 #else 5316 struct route ro; 5317 #endif 5318 struct radix_node *rn; 5319 struct rtentry *rt; 5320 struct ifnet *ifp; 5321 5322 check_mpath = 0; 5323 bzero(&ro, sizeof(ro)); 5324 switch (af) { 5325 case AF_INET: 5326 dst = satosin(&ro.ro_dst); 5327 dst->sin_family = AF_INET; 5328 dst->sin_len = sizeof(*dst); 5329 dst->sin_addr = addr->v4; 5330 break; 5331 #ifdef INET6 5332 case AF_INET6: 5333 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5334 dst6->sin6_family = AF_INET6; 5335 dst6->sin6_len = sizeof(*dst6); 5336 dst6->sin6_addr = addr->v6; 5337 break; 5338 #endif /* INET6 */ 5339 default: 5340 return (0); 5341 } 5342 5343 /* Skip checks for ipsec interfaces */ 5344 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5345 goto out; 5346 5347 rtalloc_ign((struct route *)&ro, 0); 5348 5349 if (ro.ro_rt != NULL) { 5350 /* No interface given, this is a no-route check */ 5351 if (kif == NULL) 5352 goto out; 5353 5354 if (kif->pfik_ifp == NULL) { 5355 ret = 0; 5356 goto out; 5357 } 5358 5359 /* Perform uRPF check if passed input interface */ 5360 ret = 0; 5361 rn = (struct radix_node *)ro.ro_rt; 5362 do { 5363 rt = (struct rtentry *)rn; 5364 ifp = rt->rt_ifp; 5365 5366 if (kif->pfik_ifp == ifp) 5367 ret = 1; 5368 rn = NULL; 5369 } while (check_mpath == 1 && rn != NULL && ret == 0); 5370 } else 5371 ret = 0; 5372 out: 5373 if (ro.ro_rt != NULL) 5374 RTFREE(ro.ro_rt); 5375 return (ret); 5376 } 5377 5378 int 5379 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5380 { 5381 struct sockaddr_in *dst; 5382 #ifdef INET6 5383 struct sockaddr_in6 *dst6; 5384 struct route_in6 ro; 5385 #else 5386 struct route ro; 5387 #endif 5388 int ret = 0; 5389 5390 ASSERT_LWKT_TOKEN_HELD(&pf_token); 5391 5392 bzero(&ro, sizeof(ro)); 5393 switch (af) { 5394 case AF_INET: 5395 dst = satosin(&ro.ro_dst); 5396 dst->sin_family = AF_INET; 5397 dst->sin_len = sizeof(*dst); 5398 dst->sin_addr = addr->v4; 5399 break; 5400 #ifdef INET6 5401 case AF_INET6: 5402 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5403 dst6->sin6_family = AF_INET6; 5404 dst6->sin6_len = sizeof(*dst6); 5405 dst6->sin6_addr = addr->v6; 5406 break; 5407 #endif /* INET6 */ 5408 default: 5409 return (0); 5410 } 5411 5412 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING)); 5413 5414 if (ro.ro_rt != NULL) { 5415 RTFREE(ro.ro_rt); 5416 } 5417 5418 return (ret); 5419 } 5420 5421 #ifdef INET 5422 void 5423 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5424 struct pf_state *s, struct pf_pdesc *pd) 5425 { 5426 struct mbuf *m0, *m1; 5427 struct route iproute; 5428 struct route *ro = NULL; 5429 struct sockaddr_in *dst; 5430 struct ip *ip; 5431 struct ifnet *ifp = NULL; 5432 struct pf_addr naddr; 5433 struct pf_src_node *sn = NULL; 5434 int error = 0; 5435 int sw_csum; 5436 #ifdef IPSEC 5437 struct m_tag *mtag; 5438 #endif /* IPSEC */ 5439 5440 ASSERT_LWKT_TOKEN_HELD(&pf_token); 5441 5442 if (m == NULL || *m == NULL || r == NULL || 5443 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5444 panic("pf_route: invalid parameters"); 5445 5446 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5447 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5448 (*m)->m_pkthdr.pf.routed = 1; 5449 } else { 5450 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5451 m0 = *m; 5452 *m = NULL; 5453 goto bad; 5454 } 5455 } 5456 5457 if (r->rt == PF_DUPTO) { 5458 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) { 5459 return; 5460 } 5461 } else { 5462 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5463 return; 5464 } 5465 m0 = *m; 5466 } 5467 5468 if (m0->m_len < sizeof(struct ip)) { 5469 DPFPRINTF(PF_DEBUG_URGENT, 5470 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5471 goto bad; 5472 } 5473 5474 ip = mtod(m0, struct ip *); 5475 5476 ro = &iproute; 5477 bzero((caddr_t)ro, sizeof(*ro)); 5478 dst = satosin(&ro->ro_dst); 5479 dst->sin_family = AF_INET; 5480 dst->sin_len = sizeof(*dst); 5481 dst->sin_addr = ip->ip_dst; 5482 5483 if (r->rt == PF_FASTROUTE) { 5484 rtalloc(ro); 5485 if (ro->ro_rt == 0) { 5486 ipstat.ips_noroute++; 5487 goto bad; 5488 } 5489 5490 ifp = ro->ro_rt->rt_ifp; 5491 ro->ro_rt->rt_use++; 5492 5493 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 5494 dst = satosin(ro->ro_rt->rt_gateway); 5495 } else { 5496 if (TAILQ_EMPTY(&r->rpool.list)) { 5497 DPFPRINTF(PF_DEBUG_URGENT, 5498 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5499 goto bad; 5500 } 5501 if (s == NULL) { 5502 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5503 &naddr, NULL, &sn); 5504 if (!PF_AZERO(&naddr, AF_INET)) 5505 dst->sin_addr.s_addr = naddr.v4.s_addr; 5506 ifp = r->rpool.cur->kif ? 5507 r->rpool.cur->kif->pfik_ifp : NULL; 5508 } else { 5509 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5510 dst->sin_addr.s_addr = 5511 s->rt_addr.v4.s_addr; 5512 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5513 } 5514 } 5515 if (ifp == NULL) 5516 goto bad; 5517 5518 if (oifp != ifp) { 5519 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5520 goto bad; 5521 } else if (m0 == NULL) { 5522 goto done; 5523 } 5524 if (m0->m_len < sizeof(struct ip)) { 5525 DPFPRINTF(PF_DEBUG_URGENT, 5526 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5527 goto bad; 5528 } 5529 ip = mtod(m0, struct ip *); 5530 } 5531 5532 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 5533 m0->m_pkthdr.csum_flags |= CSUM_IP; 5534 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5535 if (sw_csum & CSUM_DELAY_DATA) { 5536 in_delayed_cksum(m0); 5537 sw_csum &= ~CSUM_DELAY_DATA; 5538 } 5539 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5540 5541 if (ip->ip_len <= ifp->if_mtu || 5542 (ifp->if_hwassist & CSUM_FRAGMENT && 5543 (ip->ip_off & IP_DF) == 0)) { 5544 ip->ip_len = htons(ip->ip_len); 5545 ip->ip_off = htons(ip->ip_off); 5546 ip->ip_sum = 0; 5547 if (sw_csum & CSUM_DELAY_IP) { 5548 /* From KAME */ 5549 if (ip->ip_v == IPVERSION && 5550 (ip->ip_hl << 2) == sizeof(*ip)) { 5551 ip->ip_sum = in_cksum_hdr(ip); 5552 } else { 5553 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5554 } 5555 } 5556 lwkt_reltoken(&pf_token); 5557 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt); 5558 lwkt_gettoken(&pf_token); 5559 goto done; 5560 } 5561 5562 /* 5563 * Too large for interface; fragment if possible. 5564 * Must be able to put at least 8 bytes per fragment. 5565 */ 5566 if (ip->ip_off & IP_DF) { 5567 ipstat.ips_cantfrag++; 5568 if (r->rt != PF_DUPTO) { 5569 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5570 ifp->if_mtu); 5571 goto done; 5572 } else 5573 goto bad; 5574 } 5575 5576 m1 = m0; 5577 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5578 if (error) { 5579 goto bad; 5580 } 5581 5582 for (m0 = m1; m0; m0 = m1) { 5583 m1 = m0->m_nextpkt; 5584 m0->m_nextpkt = 0; 5585 if (error == 0) { 5586 lwkt_reltoken(&pf_token); 5587 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5588 NULL); 5589 lwkt_gettoken(&pf_token); 5590 } else 5591 m_freem(m0); 5592 } 5593 5594 if (error == 0) 5595 ipstat.ips_fragmented++; 5596 5597 done: 5598 if (r->rt != PF_DUPTO) 5599 *m = NULL; 5600 if (ro == &iproute && ro->ro_rt) 5601 RTFREE(ro->ro_rt); 5602 return; 5603 5604 bad: 5605 m_freem(m0); 5606 goto done; 5607 } 5608 #endif /* INET */ 5609 5610 #ifdef INET6 5611 void 5612 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5613 struct pf_state *s, struct pf_pdesc *pd) 5614 { 5615 struct mbuf *m0; 5616 struct route_in6 ip6route; 5617 struct route_in6 *ro; 5618 struct sockaddr_in6 *dst; 5619 struct ip6_hdr *ip6; 5620 struct ifnet *ifp = NULL; 5621 struct pf_addr naddr; 5622 struct pf_src_node *sn = NULL; 5623 int error = 0; 5624 5625 if (m == NULL || *m == NULL || r == NULL || 5626 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5627 panic("pf_route6: invalid parameters"); 5628 5629 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5630 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5631 (*m)->m_pkthdr.pf.routed = 1; 5632 } else { 5633 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5634 m0 = *m; 5635 *m = NULL; 5636 goto bad; 5637 } 5638 } 5639 5640 if (r->rt == PF_DUPTO) { 5641 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) 5642 return; 5643 } else { 5644 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5645 return; 5646 m0 = *m; 5647 } 5648 5649 if (m0->m_len < sizeof(struct ip6_hdr)) { 5650 DPFPRINTF(PF_DEBUG_URGENT, 5651 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5652 goto bad; 5653 } 5654 ip6 = mtod(m0, struct ip6_hdr *); 5655 5656 ro = &ip6route; 5657 bzero((caddr_t)ro, sizeof(*ro)); 5658 dst = (struct sockaddr_in6 *)&ro->ro_dst; 5659 dst->sin6_family = AF_INET6; 5660 dst->sin6_len = sizeof(*dst); 5661 dst->sin6_addr = ip6->ip6_dst; 5662 5663 /* 5664 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 5665 * so make sure pf.flags is clear. 5666 * 5667 * Cheat. XXX why only in the v6 case??? 5668 */ 5669 if (r->rt == PF_FASTROUTE) { 5670 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 5671 m0->m_pkthdr.pf.flags = 0; 5672 /* XXX Re-Check when Upgrading to > 4.4 */ 5673 m0->m_pkthdr.pf.statekey = NULL; 5674 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5675 return; 5676 } 5677 5678 if (TAILQ_EMPTY(&r->rpool.list)) { 5679 DPFPRINTF(PF_DEBUG_URGENT, 5680 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 5681 goto bad; 5682 } 5683 if (s == NULL) { 5684 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5685 &naddr, NULL, &sn); 5686 if (!PF_AZERO(&naddr, AF_INET6)) 5687 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5688 &naddr, AF_INET6); 5689 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5690 } else { 5691 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5692 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5693 &s->rt_addr, AF_INET6); 5694 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5695 } 5696 if (ifp == NULL) 5697 goto bad; 5698 5699 if (oifp != ifp) { 5700 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5701 goto bad; 5702 } else if (m0 == NULL) { 5703 goto done; 5704 } 5705 if (m0->m_len < sizeof(struct ip6_hdr)) { 5706 DPFPRINTF(PF_DEBUG_URGENT, 5707 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5708 goto bad; 5709 } 5710 ip6 = mtod(m0, struct ip6_hdr *); 5711 } 5712 5713 /* 5714 * If the packet is too large for the outgoing interface, 5715 * send back an icmp6 error. 5716 */ 5717 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 5718 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5719 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 5720 error = nd6_output(ifp, ifp, m0, dst, NULL); 5721 } else { 5722 in6_ifstat_inc(ifp, ifs6_in_toobig); 5723 if (r->rt != PF_DUPTO) 5724 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5725 else 5726 goto bad; 5727 } 5728 5729 done: 5730 if (r->rt != PF_DUPTO) 5731 *m = NULL; 5732 return; 5733 5734 bad: 5735 m_freem(m0); 5736 goto done; 5737 } 5738 #endif /* INET6 */ 5739 5740 5741 /* 5742 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 5743 * off is the offset where the protocol header starts 5744 * len is the total length of protocol header plus payload 5745 * returns 0 when the checksum is valid, otherwise returns 1. 5746 */ 5747 /* 5748 * XXX 5749 * FreeBSD supports cksum offload for the following drivers. 5750 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4) 5751 * If we can make full use of it we would outperform ipfw/ipfilter in 5752 * very heavy traffic. 5753 * I have not tested 'cause I don't have NICs that supports cksum offload. 5754 * (There might be problems. Typical phenomena would be 5755 * 1. No route message for UDP packet. 5756 * 2. No connection acceptance from external hosts regardless of rule set.) 5757 */ 5758 int 5759 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 5760 sa_family_t af) 5761 { 5762 u_int16_t sum = 0; 5763 int hw_assist = 0; 5764 struct ip *ip; 5765 5766 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5767 return (1); 5768 if (m->m_pkthdr.len < off + len) 5769 return (1); 5770 5771 switch (p) { 5772 case IPPROTO_TCP: 5773 case IPPROTO_UDP: 5774 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5775 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5776 sum = m->m_pkthdr.csum_data; 5777 } else { 5778 ip = mtod(m, struct ip *); 5779 sum = in_pseudo(ip->ip_src.s_addr, 5780 ip->ip_dst.s_addr, htonl((u_short)len + 5781 m->m_pkthdr.csum_data + p)); 5782 } 5783 sum ^= 0xffff; 5784 ++hw_assist; 5785 } 5786 break; 5787 case IPPROTO_ICMP: 5788 #ifdef INET6 5789 case IPPROTO_ICMPV6: 5790 #endif /* INET6 */ 5791 break; 5792 default: 5793 return (1); 5794 } 5795 5796 if (!hw_assist) { 5797 switch (af) { 5798 case AF_INET: 5799 if (p == IPPROTO_ICMP) { 5800 if (m->m_len < off) 5801 return (1); 5802 m->m_data += off; 5803 m->m_len -= off; 5804 sum = in_cksum(m, len); 5805 m->m_data -= off; 5806 m->m_len += off; 5807 } else { 5808 if (m->m_len < sizeof(struct ip)) 5809 return (1); 5810 sum = in_cksum_range(m, p, off, len); 5811 if (sum == 0) { 5812 m->m_pkthdr.csum_flags |= 5813 (CSUM_DATA_VALID | 5814 CSUM_PSEUDO_HDR); 5815 m->m_pkthdr.csum_data = 0xffff; 5816 } 5817 } 5818 break; 5819 #ifdef INET6 5820 case AF_INET6: 5821 if (m->m_len < sizeof(struct ip6_hdr)) 5822 return (1); 5823 sum = in6_cksum(m, p, off, len); 5824 /* 5825 * XXX 5826 * IPv6 H/W cksum off-load not supported yet! 5827 * 5828 * if (sum == 0) { 5829 * m->m_pkthdr.csum_flags |= 5830 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 5831 * m->m_pkthdr.csum_data = 0xffff; 5832 *} 5833 */ 5834 break; 5835 #endif /* INET6 */ 5836 default: 5837 return (1); 5838 } 5839 } 5840 if (sum) { 5841 switch (p) { 5842 case IPPROTO_TCP: 5843 tcpstat.tcps_rcvbadsum++; 5844 break; 5845 case IPPROTO_UDP: 5846 udpstat.udps_badsum++; 5847 break; 5848 case IPPROTO_ICMP: 5849 icmpstat.icps_checksum++; 5850 break; 5851 #ifdef INET6 5852 case IPPROTO_ICMPV6: 5853 icmp6stat.icp6s_checksum++; 5854 break; 5855 #endif /* INET6 */ 5856 } 5857 return (1); 5858 } 5859 return (0); 5860 } 5861 5862 struct pf_divert * 5863 pf_find_divert(struct mbuf *m) 5864 { 5865 struct m_tag *mtag; 5866 5867 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) 5868 return (NULL); 5869 5870 return ((struct pf_divert *)(mtag + 1)); 5871 } 5872 5873 struct pf_divert * 5874 pf_get_divert(struct mbuf *m) 5875 { 5876 struct m_tag *mtag; 5877 5878 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) { 5879 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert), 5880 M_NOWAIT); 5881 if (mtag == NULL) 5882 return (NULL); 5883 bzero(mtag + 1, sizeof(struct pf_divert)); 5884 m_tag_prepend(m, mtag); 5885 } 5886 5887 return ((struct pf_divert *)(mtag + 1)); 5888 } 5889 5890 #ifdef INET 5891 int 5892 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 5893 struct ether_header *eh, struct inpcb *inp) 5894 { 5895 struct pfi_kif *kif; 5896 u_short action, reason = 0, log = 0; 5897 struct mbuf *m = *m0; 5898 struct ip *h = NULL; 5899 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5900 struct pf_state *s = NULL; 5901 struct pf_ruleset *ruleset = NULL; 5902 struct pf_pdesc pd; 5903 int off, dirndx, pqid = 0; 5904 5905 if (!pf_status.running) 5906 return (PF_PASS); 5907 5908 memset(&pd, 0, sizeof(pd)); 5909 #ifdef foo 5910 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 5911 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 5912 else 5913 #endif 5914 kif = (struct pfi_kif *)ifp->if_pf_kif; 5915 5916 if (kif == NULL) { 5917 DPFPRINTF(PF_DEBUG_URGENT, 5918 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5919 return (PF_DROP); 5920 } 5921 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5922 return (PF_PASS); 5923 5924 #ifdef DIAGNOSTIC 5925 if ((m->m_flags & M_PKTHDR) == 0) 5926 panic("non-M_PKTHDR is passed to pf_test"); 5927 #endif /* DIAGNOSTIC */ 5928 5929 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5930 action = PF_DROP; 5931 REASON_SET(&reason, PFRES_SHORT); 5932 log = 1; 5933 goto done; 5934 } 5935 5936 /* 5937 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 5938 * so make sure pf.flags is clear. 5939 */ 5940 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 5941 return (PF_PASS); 5942 m->m_pkthdr.pf.flags = 0; 5943 /* Re-Check when updating to > 4.4 */ 5944 m->m_pkthdr.pf.statekey = NULL; 5945 5946 /* We do IP header normalization and packet reassembly here */ 5947 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5948 action = PF_DROP; 5949 goto done; 5950 } 5951 m = *m0; /* pf_normalize messes with m0 */ 5952 h = mtod(m, struct ip *); 5953 5954 off = h->ip_hl << 2; 5955 if (off < (int)sizeof(*h)) { 5956 action = PF_DROP; 5957 REASON_SET(&reason, PFRES_SHORT); 5958 log = 1; 5959 goto done; 5960 } 5961 5962 pd.src = (struct pf_addr *)&h->ip_src; 5963 pd.dst = (struct pf_addr *)&h->ip_dst; 5964 pd.sport = pd.dport = NULL; 5965 pd.ip_sum = &h->ip_sum; 5966 pd.proto_sum = NULL; 5967 pd.proto = h->ip_p; 5968 pd.dir = dir; 5969 pd.sidx = (dir == PF_IN) ? 0 : 1; 5970 pd.didx = (dir == PF_IN) ? 1 : 0; 5971 pd.af = AF_INET; 5972 pd.tos = h->ip_tos; 5973 pd.tot_len = h->ip_len; 5974 pd.eh = eh; 5975 5976 /* handle fragments that didn't get reassembled by normalization */ 5977 if (h->ip_off & (IP_MF | IP_OFFMASK)) { 5978 action = pf_test_fragment(&r, dir, kif, m, h, 5979 &pd, &a, &ruleset); 5980 goto done; 5981 } 5982 5983 switch (h->ip_p) { 5984 5985 case IPPROTO_TCP: { 5986 struct tcphdr th; 5987 5988 pd.hdr.tcp = &th; 5989 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5990 &action, &reason, AF_INET)) { 5991 log = action != PF_PASS; 5992 goto done; 5993 } 5994 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5995 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5996 pqid = 1; 5997 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5998 if (action == PF_DROP) 5999 goto done; 6000 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6001 &reason); 6002 if (action == PF_PASS) { 6003 pfsync_update_state(s); 6004 r = s->rule.ptr; 6005 a = s->anchor.ptr; 6006 log = s->log; 6007 } else if (s == NULL) 6008 action = pf_test_rule(&r, &s, dir, kif, 6009 m, off, h, &pd, &a, &ruleset, NULL, inp); 6010 break; 6011 } 6012 6013 case IPPROTO_UDP: { 6014 struct udphdr uh; 6015 6016 pd.hdr.udp = &uh; 6017 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6018 &action, &reason, AF_INET)) { 6019 log = action != PF_PASS; 6020 goto done; 6021 } 6022 if (uh.uh_dport == 0 || 6023 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6024 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6025 action = PF_DROP; 6026 REASON_SET(&reason, PFRES_SHORT); 6027 goto done; 6028 } 6029 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6030 if (action == PF_PASS) { 6031 pfsync_update_state(s); 6032 r = s->rule.ptr; 6033 a = s->anchor.ptr; 6034 log = s->log; 6035 } else if (s == NULL) 6036 action = pf_test_rule(&r, &s, dir, kif, 6037 m, off, h, &pd, &a, &ruleset, NULL, inp); 6038 break; 6039 } 6040 6041 case IPPROTO_ICMP: { 6042 struct icmp ih; 6043 6044 pd.hdr.icmp = &ih; 6045 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6046 &action, &reason, AF_INET)) { 6047 log = action != PF_PASS; 6048 goto done; 6049 } 6050 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6051 &reason); 6052 if (action == PF_PASS) { 6053 pfsync_update_state(s); 6054 r = s->rule.ptr; 6055 a = s->anchor.ptr; 6056 log = s->log; 6057 } else if (s == NULL) 6058 action = pf_test_rule(&r, &s, dir, kif, 6059 m, off, h, &pd, &a, &ruleset, NULL, inp); 6060 break; 6061 } 6062 6063 default: 6064 action = pf_test_state_other(&s, dir, kif, m, &pd); 6065 if (action == PF_PASS) { 6066 pfsync_update_state(s); 6067 r = s->rule.ptr; 6068 a = s->anchor.ptr; 6069 log = s->log; 6070 } else if (s == NULL) 6071 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6072 &pd, &a, &ruleset, NULL, inp); 6073 break; 6074 } 6075 6076 done: 6077 if (action == PF_PASS && h->ip_hl > 5 && 6078 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6079 action = PF_DROP; 6080 REASON_SET(&reason, PFRES_IPOPTIONS); 6081 log = 1; 6082 DPFPRINTF(PF_DEBUG_MISC, 6083 ("pf: dropping packet with ip options\n")); 6084 } 6085 6086 if ((s && s->tag) || r->rtableid) 6087 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6088 6089 #if 0 6090 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 6091 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 6092 #endif 6093 6094 #ifdef ALTQ 6095 if (action == PF_PASS && r->qid) { 6096 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 6097 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6098 m->m_pkthdr.pf.qid = r->pqid; 6099 else 6100 m->m_pkthdr.pf.qid = r->qid; 6101 m->m_pkthdr.pf.ecn_af = AF_INET; 6102 m->m_pkthdr.pf.hdr = h; 6103 /* add connection hash for fairq */ 6104 if (s) { 6105 /* for fairq */ 6106 m->m_pkthdr.pf.state_hash = s->hash; 6107 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 6108 } 6109 } 6110 #endif /* ALTQ */ 6111 6112 /* 6113 * connections redirected to loopback should not match sockets 6114 * bound specifically to loopback due to security implications, 6115 * see tcp_input() and in_pcblookup_listen(). 6116 */ 6117 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6118 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6119 (s->nat_rule.ptr->action == PF_RDR || 6120 s->nat_rule.ptr->action == PF_BINAT) && 6121 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 6122 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6123 6124 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 6125 struct pf_divert *divert; 6126 6127 if ((divert = pf_get_divert(m))) { 6128 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 6129 divert->port = r->divert.port; 6130 divert->addr.ipv4 = r->divert.addr.v4; 6131 } 6132 } 6133 6134 if (log) { 6135 struct pf_rule *lr; 6136 6137 if (s != NULL && s->nat_rule.ptr != NULL && 6138 s->nat_rule.ptr->log & PF_LOG_ALL) 6139 lr = s->nat_rule.ptr; 6140 else 6141 lr = r; 6142 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 6143 &pd); 6144 } 6145 6146 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6147 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6148 6149 if (action == PF_PASS || r->action == PF_DROP) { 6150 dirndx = (dir == PF_OUT); 6151 r->packets[dirndx]++; 6152 r->bytes[dirndx] += pd.tot_len; 6153 if (a != NULL) { 6154 a->packets[dirndx]++; 6155 a->bytes[dirndx] += pd.tot_len; 6156 } 6157 if (s != NULL) { 6158 if (s->nat_rule.ptr != NULL) { 6159 s->nat_rule.ptr->packets[dirndx]++; 6160 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6161 } 6162 if (s->src_node != NULL) { 6163 s->src_node->packets[dirndx]++; 6164 s->src_node->bytes[dirndx] += pd.tot_len; 6165 } 6166 if (s->nat_src_node != NULL) { 6167 s->nat_src_node->packets[dirndx]++; 6168 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6169 } 6170 dirndx = (dir == s->direction) ? 0 : 1; 6171 s->packets[dirndx]++; 6172 s->bytes[dirndx] += pd.tot_len; 6173 } 6174 tr = r; 6175 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6176 if (nr != NULL && r == &pf_default_rule) 6177 tr = nr; 6178 if (tr->src.addr.type == PF_ADDR_TABLE) 6179 pfr_update_stats(tr->src.addr.p.tbl, 6180 (s == NULL) ? pd.src : 6181 &s->key[(s->direction == PF_IN)]-> 6182 addr[(s->direction == PF_OUT)], 6183 pd.af, pd.tot_len, dir == PF_OUT, 6184 r->action == PF_PASS, tr->src.neg); 6185 if (tr->dst.addr.type == PF_ADDR_TABLE) 6186 pfr_update_stats(tr->dst.addr.p.tbl, 6187 (s == NULL) ? pd.dst : 6188 &s->key[(s->direction == PF_IN)]-> 6189 addr[(s->direction == PF_IN)], 6190 pd.af, pd.tot_len, dir == PF_OUT, 6191 r->action == PF_PASS, tr->dst.neg); 6192 } 6193 6194 6195 if (action == PF_SYNPROXY_DROP) { 6196 m_freem(*m0); 6197 *m0 = NULL; 6198 action = PF_PASS; 6199 } else if (r->rt) 6200 /* pf_route can free the mbuf causing *m0 to become NULL */ 6201 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6202 6203 return (action); 6204 } 6205 #endif /* INET */ 6206 6207 #ifdef INET6 6208 int 6209 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6210 struct ether_header *eh, struct inpcb *inp) 6211 { 6212 struct pfi_kif *kif; 6213 u_short action, reason = 0, log = 0; 6214 struct mbuf *m = *m0, *n = NULL; 6215 struct ip6_hdr *h = NULL; 6216 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6217 struct pf_state *s = NULL; 6218 struct pf_ruleset *ruleset = NULL; 6219 struct pf_pdesc pd; 6220 int off, terminal = 0, dirndx, rh_cnt = 0; 6221 6222 if (!pf_status.running) 6223 return (PF_PASS); 6224 6225 memset(&pd, 0, sizeof(pd)); 6226 #ifdef foo 6227 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6228 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6229 else 6230 #endif 6231 kif = (struct pfi_kif *)ifp->if_pf_kif; 6232 6233 if (kif == NULL) { 6234 DPFPRINTF(PF_DEBUG_URGENT, 6235 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6236 return (PF_DROP); 6237 } 6238 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6239 return (PF_PASS); 6240 6241 #ifdef DIAGNOSTIC 6242 if ((m->m_flags & M_PKTHDR) == 0) 6243 panic("non-M_PKTHDR is passed to pf_test6"); 6244 #endif /* DIAGNOSTIC */ 6245 6246 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6247 action = PF_DROP; 6248 REASON_SET(&reason, PFRES_SHORT); 6249 log = 1; 6250 goto done; 6251 } 6252 6253 /* 6254 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 6255 * so make sure pf.flags is clear. 6256 */ 6257 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 6258 return (PF_PASS); 6259 m->m_pkthdr.pf.flags = 0; 6260 /* Re-Check when updating to > 4.4 */ 6261 m->m_pkthdr.pf.statekey = NULL; 6262 6263 /* We do IP header normalization and packet reassembly here */ 6264 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6265 action = PF_DROP; 6266 goto done; 6267 } 6268 m = *m0; /* pf_normalize messes with m0 */ 6269 h = mtod(m, struct ip6_hdr *); 6270 6271 #if 1 6272 /* 6273 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6274 * will do something bad, so drop the packet for now. 6275 */ 6276 if (htons(h->ip6_plen) == 0) { 6277 action = PF_DROP; 6278 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6279 goto done; 6280 } 6281 #endif 6282 6283 pd.src = (struct pf_addr *)&h->ip6_src; 6284 pd.dst = (struct pf_addr *)&h->ip6_dst; 6285 pd.sport = pd.dport = NULL; 6286 pd.ip_sum = NULL; 6287 pd.proto_sum = NULL; 6288 pd.dir = dir; 6289 pd.sidx = (dir == PF_IN) ? 0 : 1; 6290 pd.didx = (dir == PF_IN) ? 1 : 0; 6291 pd.af = AF_INET6; 6292 pd.tos = 0; 6293 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6294 pd.eh = eh; 6295 6296 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6297 pd.proto = h->ip6_nxt; 6298 do { 6299 switch (pd.proto) { 6300 case IPPROTO_FRAGMENT: 6301 action = pf_test_fragment(&r, dir, kif, m, h, 6302 &pd, &a, &ruleset); 6303 if (action == PF_DROP) 6304 REASON_SET(&reason, PFRES_FRAG); 6305 goto done; 6306 case IPPROTO_ROUTING: { 6307 struct ip6_rthdr rthdr; 6308 6309 if (rh_cnt++) { 6310 DPFPRINTF(PF_DEBUG_MISC, 6311 ("pf: IPv6 more than one rthdr\n")); 6312 action = PF_DROP; 6313 REASON_SET(&reason, PFRES_IPOPTIONS); 6314 log = 1; 6315 goto done; 6316 } 6317 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6318 &reason, pd.af)) { 6319 DPFPRINTF(PF_DEBUG_MISC, 6320 ("pf: IPv6 short rthdr\n")); 6321 action = PF_DROP; 6322 REASON_SET(&reason, PFRES_SHORT); 6323 log = 1; 6324 goto done; 6325 } 6326 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6327 DPFPRINTF(PF_DEBUG_MISC, 6328 ("pf: IPv6 rthdr0\n")); 6329 action = PF_DROP; 6330 REASON_SET(&reason, PFRES_IPOPTIONS); 6331 log = 1; 6332 goto done; 6333 } 6334 /* FALLTHROUGH */ 6335 } 6336 case IPPROTO_AH: 6337 case IPPROTO_HOPOPTS: 6338 case IPPROTO_DSTOPTS: { 6339 /* get next header and header length */ 6340 struct ip6_ext opt6; 6341 6342 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6343 NULL, &reason, pd.af)) { 6344 DPFPRINTF(PF_DEBUG_MISC, 6345 ("pf: IPv6 short opt\n")); 6346 action = PF_DROP; 6347 log = 1; 6348 goto done; 6349 } 6350 if (pd.proto == IPPROTO_AH) 6351 off += (opt6.ip6e_len + 2) * 4; 6352 else 6353 off += (opt6.ip6e_len + 1) * 8; 6354 pd.proto = opt6.ip6e_nxt; 6355 /* goto the next header */ 6356 break; 6357 } 6358 default: 6359 terminal++; 6360 break; 6361 } 6362 } while (!terminal); 6363 6364 /* if there's no routing header, use unmodified mbuf for checksumming */ 6365 if (!n) 6366 n = m; 6367 6368 switch (pd.proto) { 6369 6370 case IPPROTO_TCP: { 6371 struct tcphdr th; 6372 6373 pd.hdr.tcp = &th; 6374 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6375 &action, &reason, AF_INET6)) { 6376 log = action != PF_PASS; 6377 goto done; 6378 } 6379 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6380 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6381 if (action == PF_DROP) 6382 goto done; 6383 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6384 &reason); 6385 if (action == PF_PASS) { 6386 pfsync_update_state(s); 6387 r = s->rule.ptr; 6388 a = s->anchor.ptr; 6389 log = s->log; 6390 } else if (s == NULL) 6391 action = pf_test_rule(&r, &s, dir, kif, 6392 m, off, h, &pd, &a, &ruleset, NULL, inp); 6393 break; 6394 } 6395 6396 case IPPROTO_UDP: { 6397 struct udphdr uh; 6398 6399 pd.hdr.udp = &uh; 6400 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6401 &action, &reason, AF_INET6)) { 6402 log = action != PF_PASS; 6403 goto done; 6404 } 6405 if (uh.uh_dport == 0 || 6406 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6407 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6408 action = PF_DROP; 6409 REASON_SET(&reason, PFRES_SHORT); 6410 goto done; 6411 } 6412 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6413 if (action == PF_PASS) { 6414 pfsync_update_state(s); 6415 r = s->rule.ptr; 6416 a = s->anchor.ptr; 6417 log = s->log; 6418 } else if (s == NULL) 6419 action = pf_test_rule(&r, &s, dir, kif, 6420 m, off, h, &pd, &a, &ruleset, NULL, inp); 6421 break; 6422 } 6423 6424 case IPPROTO_ICMPV6: { 6425 struct icmp6_hdr ih; 6426 6427 pd.hdr.icmp6 = &ih; 6428 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6429 &action, &reason, AF_INET6)) { 6430 log = action != PF_PASS; 6431 goto done; 6432 } 6433 action = pf_test_state_icmp(&s, dir, kif, 6434 m, off, h, &pd, &reason); 6435 if (action == PF_PASS) { 6436 pfsync_update_state(s); 6437 r = s->rule.ptr; 6438 a = s->anchor.ptr; 6439 log = s->log; 6440 } else if (s == NULL) 6441 action = pf_test_rule(&r, &s, dir, kif, 6442 m, off, h, &pd, &a, &ruleset, NULL, inp); 6443 break; 6444 } 6445 6446 default: 6447 action = pf_test_state_other(&s, dir, kif, m, &pd); 6448 if (action == PF_PASS) { 6449 pfsync_update_state(s); 6450 r = s->rule.ptr; 6451 a = s->anchor.ptr; 6452 log = s->log; 6453 } else if (s == NULL) 6454 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6455 &pd, &a, &ruleset, NULL, inp); 6456 break; 6457 } 6458 6459 done: 6460 if (n != m) { 6461 m_freem(n); 6462 n = NULL; 6463 } 6464 6465 /* handle dangerous IPv6 extension headers. */ 6466 if (action == PF_PASS && rh_cnt && 6467 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6468 action = PF_DROP; 6469 REASON_SET(&reason, PFRES_IPOPTIONS); 6470 log = 1; 6471 DPFPRINTF(PF_DEBUG_MISC, 6472 ("pf: dropping packet with dangerous v6 headers\n")); 6473 } 6474 6475 if ((s && s->tag) || r->rtableid) 6476 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6477 6478 #if 0 6479 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 6480 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 6481 #endif 6482 6483 #ifdef ALTQ 6484 if (action == PF_PASS && r->qid) { 6485 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 6486 if (pd.tos & IPTOS_LOWDELAY) 6487 m->m_pkthdr.pf.qid = r->pqid; 6488 else 6489 m->m_pkthdr.pf.qid = r->qid; 6490 m->m_pkthdr.pf.ecn_af = AF_INET6; 6491 m->m_pkthdr.pf.hdr = h; 6492 if (s) { 6493 /* for fairq */ 6494 m->m_pkthdr.pf.state_hash = s->hash; 6495 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 6496 } 6497 } 6498 #endif /* ALTQ */ 6499 6500 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6501 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6502 (s->nat_rule.ptr->action == PF_RDR || 6503 s->nat_rule.ptr->action == PF_BINAT) && 6504 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6505 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6506 6507 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 6508 struct pf_divert *divert; 6509 6510 if ((divert = pf_get_divert(m))) { 6511 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 6512 divert->port = r->divert.port; 6513 divert->addr.ipv6 = r->divert.addr.v6; 6514 } 6515 } 6516 6517 if (log) { 6518 struct pf_rule *lr; 6519 6520 if (s != NULL && s->nat_rule.ptr != NULL && 6521 s->nat_rule.ptr->log & PF_LOG_ALL) 6522 lr = s->nat_rule.ptr; 6523 else 6524 lr = r; 6525 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 6526 &pd); 6527 } 6528 6529 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6530 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6531 6532 if (action == PF_PASS || r->action == PF_DROP) { 6533 dirndx = (dir == PF_OUT); 6534 r->packets[dirndx]++; 6535 r->bytes[dirndx] += pd.tot_len; 6536 if (a != NULL) { 6537 a->packets[dirndx]++; 6538 a->bytes[dirndx] += pd.tot_len; 6539 } 6540 if (s != NULL) { 6541 if (s->nat_rule.ptr != NULL) { 6542 s->nat_rule.ptr->packets[dirndx]++; 6543 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6544 } 6545 if (s->src_node != NULL) { 6546 s->src_node->packets[dirndx]++; 6547 s->src_node->bytes[dirndx] += pd.tot_len; 6548 } 6549 if (s->nat_src_node != NULL) { 6550 s->nat_src_node->packets[dirndx]++; 6551 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6552 } 6553 dirndx = (dir == s->direction) ? 0 : 1; 6554 s->packets[dirndx]++; 6555 s->bytes[dirndx] += pd.tot_len; 6556 } 6557 tr = r; 6558 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6559 if (nr != NULL && r == &pf_default_rule) 6560 tr = nr; 6561 if (tr->src.addr.type == PF_ADDR_TABLE) 6562 pfr_update_stats(tr->src.addr.p.tbl, 6563 (s == NULL) ? pd.src : 6564 &s->key[(s->direction == PF_IN)]->addr[0], 6565 pd.af, pd.tot_len, dir == PF_OUT, 6566 r->action == PF_PASS, tr->src.neg); 6567 if (tr->dst.addr.type == PF_ADDR_TABLE) 6568 pfr_update_stats(tr->dst.addr.p.tbl, 6569 (s == NULL) ? pd.dst : 6570 &s->key[(s->direction == PF_IN)]->addr[1], 6571 pd.af, pd.tot_len, dir == PF_OUT, 6572 r->action == PF_PASS, tr->dst.neg); 6573 } 6574 6575 6576 if (action == PF_SYNPROXY_DROP) { 6577 m_freem(*m0); 6578 *m0 = NULL; 6579 action = PF_PASS; 6580 } else if (r->rt) 6581 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 6582 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6583 6584 return (action); 6585 } 6586 #endif /* INET6 */ 6587 6588 int 6589 pf_check_congestion(struct ifqueue *ifq) 6590 { 6591 return (0); 6592 } 6593