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/netisr2.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 struct netmsg_hashlookup { 2816 struct netmsg_base base; 2817 struct inpcb **nm_pinp; 2818 struct inpcbinfo *nm_pcbinfo; 2819 struct pf_addr *nm_saddr; 2820 struct pf_addr *nm_daddr; 2821 uint16_t nm_sport; 2822 uint16_t nm_dport; 2823 sa_family_t nm_af; 2824 }; 2825 2826 #ifdef PF_SOCKET_LOOKUP_DOMSG 2827 static void 2828 in_pcblookup_hash_handler(netmsg_t msg) 2829 { 2830 struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg; 2831 2832 if (rmsg->nm_af == AF_INET) 2833 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo, 2834 rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4, 2835 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2836 #ifdef INET6 2837 else 2838 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo, 2839 &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6, 2840 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL); 2841 #endif /* INET6 */ 2842 lwkt_replymsg(&rmsg->base.lmsg, 0); 2843 } 2844 #endif /* PF_SOCKET_LOOKUP_DOMSG */ 2845 2846 int 2847 pf_socket_lookup(int direction, struct pf_pdesc *pd) 2848 { 2849 struct pf_addr *saddr, *daddr; 2850 u_int16_t sport, dport; 2851 struct inpcbinfo *pi; 2852 struct inpcb *inp; 2853 struct netmsg_hashlookup *msg = NULL; 2854 #ifdef PF_SOCKET_LOOKUP_DOMSG 2855 struct netmsg_hashlookup msg0; 2856 #endif 2857 int pi_cpu = 0; 2858 2859 if (pd == NULL) 2860 return (-1); 2861 pd->lookup.uid = UID_MAX; 2862 pd->lookup.gid = GID_MAX; 2863 pd->lookup.pid = NO_PID; 2864 if (direction == PF_IN) { 2865 saddr = pd->src; 2866 daddr = pd->dst; 2867 } else { 2868 saddr = pd->dst; 2869 daddr = pd->src; 2870 } 2871 switch (pd->proto) { 2872 case IPPROTO_TCP: 2873 if (pd->hdr.tcp == NULL) 2874 return (-1); 2875 sport = pd->hdr.tcp->th_sport; 2876 dport = pd->hdr.tcp->th_dport; 2877 2878 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport); 2879 pi = &tcbinfo[pi_cpu]; 2880 /* 2881 * Our netstack runs lockless on MP systems 2882 * (only for TCP connections at the moment). 2883 * 2884 * As we are not allowed to read another CPU's tcbinfo, 2885 * we have to ask that CPU via remote call to search the 2886 * table for us. 2887 * 2888 * Prepare a msg iff data belongs to another CPU. 2889 */ 2890 if (pi_cpu != mycpu->gd_cpuid) { 2891 #ifdef PF_SOCKET_LOOKUP_DOMSG 2892 /* 2893 * NOTE: 2894 * 2895 * Following lwkt_domsg() is dangerous and could 2896 * lockup the network system, e.g. 2897 * 2898 * On 2 CPU system: 2899 * netisr0 domsg to netisr1 (due to lookup) 2900 * netisr1 domsg to netisr0 (due to lookup) 2901 * 2902 * We simply return -1 here, since we are probably 2903 * called before NAT, so the TCP packet should 2904 * already be on the correct CPU. 2905 */ 2906 msg = &msg0; 2907 netmsg_init(&msg->base, NULL, &curthread->td_msgport, 2908 0, in_pcblookup_hash_handler); 2909 msg->nm_pinp = &inp; 2910 msg->nm_pcbinfo = pi; 2911 msg->nm_saddr = saddr; 2912 msg->nm_sport = sport; 2913 msg->nm_daddr = daddr; 2914 msg->nm_dport = dport; 2915 msg->nm_af = pd->af; 2916 #else /* !PF_SOCKET_LOOKUP_DOMSG */ 2917 kprintf("pf_socket_lookup: tcp packet not on the " 2918 "correct cpu %d, cur cpu %d\n", 2919 pi_cpu, mycpuid); 2920 print_backtrace(-1); 2921 return -1; 2922 #endif /* PF_SOCKET_LOOKUP_DOMSG */ 2923 } 2924 break; 2925 case IPPROTO_UDP: 2926 if (pd->hdr.udp == NULL) 2927 return (-1); 2928 sport = pd->hdr.udp->uh_sport; 2929 dport = pd->hdr.udp->uh_dport; 2930 pi = &udbinfo; 2931 break; 2932 default: 2933 return (-1); 2934 } 2935 if (direction != PF_IN) { 2936 u_int16_t p; 2937 2938 p = sport; 2939 sport = dport; 2940 dport = p; 2941 } 2942 switch (pd->af) { 2943 #ifdef INET6 2944 case AF_INET6: 2945 /* 2946 * Query other CPU, second part 2947 * 2948 * msg only gets initialized when: 2949 * 1) packet is TCP 2950 * 2) the info belongs to another CPU 2951 * 2952 * Use some switch/case magic to avoid code duplication. 2953 */ 2954 if (msg == NULL) { 2955 inp = in6_pcblookup_hash(pi, &saddr->v6, sport, 2956 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL); 2957 2958 if (inp == NULL) 2959 return (-1); 2960 break; 2961 } 2962 /* FALLTHROUGH if SMP and on other CPU */ 2963 #endif /* INET6 */ 2964 case AF_INET: 2965 if (msg != NULL) { 2966 lwkt_domsg(netisr_cpuport(pi_cpu), 2967 &msg->base.lmsg, 0); 2968 } else 2969 { 2970 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, 2971 dport, INPLOOKUP_WILDCARD, NULL); 2972 } 2973 if (inp == NULL) 2974 return (-1); 2975 break; 2976 2977 default: 2978 return (-1); 2979 } 2980 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid; 2981 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0]; 2982 return (1); 2983 } 2984 2985 u_int8_t 2986 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2987 { 2988 int hlen; 2989 u_int8_t hdr[60]; 2990 u_int8_t *opt, optlen; 2991 u_int8_t wscale = 0; 2992 2993 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2994 if (hlen <= sizeof(struct tcphdr)) 2995 return (0); 2996 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2997 return (0); 2998 opt = hdr + sizeof(struct tcphdr); 2999 hlen -= sizeof(struct tcphdr); 3000 while (hlen >= 3) { 3001 switch (*opt) { 3002 case TCPOPT_EOL: 3003 case TCPOPT_NOP: 3004 ++opt; 3005 --hlen; 3006 break; 3007 case TCPOPT_WINDOW: 3008 wscale = opt[2]; 3009 if (wscale > TCP_MAX_WINSHIFT) 3010 wscale = TCP_MAX_WINSHIFT; 3011 wscale |= PF_WSCALE_FLAG; 3012 /* FALLTHROUGH */ 3013 default: 3014 optlen = opt[1]; 3015 if (optlen < 2) 3016 optlen = 2; 3017 hlen -= optlen; 3018 opt += optlen; 3019 break; 3020 } 3021 } 3022 return (wscale); 3023 } 3024 3025 u_int16_t 3026 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3027 { 3028 int hlen; 3029 u_int8_t hdr[60]; 3030 u_int8_t *opt, optlen; 3031 u_int16_t mss = tcp_mssdflt; 3032 3033 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3034 if (hlen <= sizeof(struct tcphdr)) 3035 return (0); 3036 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3037 return (0); 3038 opt = hdr + sizeof(struct tcphdr); 3039 hlen -= sizeof(struct tcphdr); 3040 while (hlen >= TCPOLEN_MAXSEG) { 3041 switch (*opt) { 3042 case TCPOPT_EOL: 3043 case TCPOPT_NOP: 3044 ++opt; 3045 --hlen; 3046 break; 3047 case TCPOPT_MAXSEG: 3048 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3049 /* FALLTHROUGH */ 3050 default: 3051 optlen = opt[1]; 3052 if (optlen < 2) 3053 optlen = 2; 3054 hlen -= optlen; 3055 opt += optlen; 3056 break; 3057 } 3058 } 3059 return (mss); 3060 } 3061 3062 u_int16_t 3063 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3064 { 3065 #ifdef INET 3066 struct sockaddr_in *dst; 3067 struct route ro; 3068 #endif /* INET */ 3069 #ifdef INET6 3070 struct sockaddr_in6 *dst6; 3071 struct route_in6 ro6; 3072 #endif /* INET6 */ 3073 struct rtentry *rt = NULL; 3074 int hlen = 0; 3075 u_int16_t mss = tcp_mssdflt; 3076 3077 switch (af) { 3078 #ifdef INET 3079 case AF_INET: 3080 hlen = sizeof(struct ip); 3081 bzero(&ro, sizeof(ro)); 3082 dst = (struct sockaddr_in *)&ro.ro_dst; 3083 dst->sin_family = AF_INET; 3084 dst->sin_len = sizeof(*dst); 3085 dst->sin_addr = addr->v4; 3086 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3087 rt = ro.ro_rt; 3088 break; 3089 #endif /* INET */ 3090 #ifdef INET6 3091 case AF_INET6: 3092 hlen = sizeof(struct ip6_hdr); 3093 bzero(&ro6, sizeof(ro6)); 3094 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3095 dst6->sin6_family = AF_INET6; 3096 dst6->sin6_len = sizeof(*dst6); 3097 dst6->sin6_addr = addr->v6; 3098 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING)); 3099 rt = ro6.ro_rt; 3100 break; 3101 #endif /* INET6 */ 3102 } 3103 3104 if (rt && rt->rt_ifp) { 3105 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3106 mss = max(tcp_mssdflt, mss); 3107 RTFREE(rt); 3108 } 3109 mss = min(mss, offer); 3110 mss = max(mss, 64); /* sanity - at least max opt space */ 3111 return (mss); 3112 } 3113 3114 void 3115 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3116 { 3117 struct pf_rule *r = s->rule.ptr; 3118 3119 s->rt_kif = NULL; 3120 if (!r->rt || r->rt == PF_FASTROUTE) 3121 return; 3122 switch (s->key[PF_SK_WIRE]->af) { 3123 #ifdef INET 3124 case AF_INET: 3125 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3126 &s->nat_src_node); 3127 s->rt_kif = r->rpool.cur->kif; 3128 break; 3129 #endif /* INET */ 3130 #ifdef INET6 3131 case AF_INET6: 3132 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3133 &s->nat_src_node); 3134 s->rt_kif = r->rpool.cur->kif; 3135 break; 3136 #endif /* INET6 */ 3137 } 3138 } 3139 3140 u_int32_t 3141 pf_tcp_iss(struct pf_pdesc *pd) 3142 { 3143 MD5_CTX ctx; 3144 u_int32_t digest[4]; 3145 3146 if (pf_tcp_secret_init == 0) { 3147 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret)); 3148 MD5Init(&pf_tcp_secret_ctx); 3149 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret, 3150 sizeof(pf_tcp_secret)); 3151 pf_tcp_secret_init = 1; 3152 } 3153 ctx = pf_tcp_secret_ctx; 3154 3155 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3156 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3157 if (pd->af == AF_INET6) { 3158 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3159 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3160 } else { 3161 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3162 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3163 } 3164 MD5Final((u_char *)digest, &ctx); 3165 pf_tcp_iss_off += 4096; 3166 return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off); 3167 } 3168 3169 int 3170 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3171 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3172 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3173 struct ifqueue *ifq, struct inpcb *inp) 3174 { 3175 struct pf_rule *nr = NULL; 3176 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3177 sa_family_t af = pd->af; 3178 struct pf_rule *r, *a = NULL; 3179 struct pf_ruleset *ruleset = NULL; 3180 struct pf_src_node *nsn = NULL; 3181 struct tcphdr *th = pd->hdr.tcp; 3182 struct pf_state_key *skw = NULL, *sks = NULL; 3183 struct pf_state_key *sk = NULL, *nk = NULL; 3184 u_short reason; 3185 int rewrite = 0, hdrlen = 0; 3186 int tag = -1, rtableid = -1; 3187 int asd = 0; 3188 int match = 0; 3189 int state_icmp = 0; 3190 u_int16_t sport = 0, dport = 0; 3191 u_int16_t bproto_sum = 0, bip_sum = 0; 3192 u_int8_t icmptype = 0, icmpcode = 0; 3193 3194 3195 if (direction == PF_IN && pf_check_congestion(ifq)) { 3196 REASON_SET(&reason, PFRES_CONGEST); 3197 return (PF_DROP); 3198 } 3199 3200 if (inp != NULL) 3201 pd->lookup.done = pf_socket_lookup(direction, pd); 3202 else if (debug_pfugidhack) { 3203 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3204 pd->lookup.done = pf_socket_lookup(direction, pd); 3205 } 3206 3207 switch (pd->proto) { 3208 case IPPROTO_TCP: 3209 sport = th->th_sport; 3210 dport = th->th_dport; 3211 hdrlen = sizeof(*th); 3212 break; 3213 case IPPROTO_UDP: 3214 sport = pd->hdr.udp->uh_sport; 3215 dport = pd->hdr.udp->uh_dport; 3216 hdrlen = sizeof(*pd->hdr.udp); 3217 break; 3218 #ifdef INET 3219 case IPPROTO_ICMP: 3220 if (pd->af != AF_INET) 3221 break; 3222 sport = dport = pd->hdr.icmp->icmp_id; 3223 hdrlen = sizeof(*pd->hdr.icmp); 3224 icmptype = pd->hdr.icmp->icmp_type; 3225 icmpcode = pd->hdr.icmp->icmp_code; 3226 3227 if (icmptype == ICMP_UNREACH || 3228 icmptype == ICMP_SOURCEQUENCH || 3229 icmptype == ICMP_REDIRECT || 3230 icmptype == ICMP_TIMXCEED || 3231 icmptype == ICMP_PARAMPROB) 3232 state_icmp++; 3233 break; 3234 #endif /* INET */ 3235 #ifdef INET6 3236 case IPPROTO_ICMPV6: 3237 if (af != AF_INET6) 3238 break; 3239 sport = dport = pd->hdr.icmp6->icmp6_id; 3240 hdrlen = sizeof(*pd->hdr.icmp6); 3241 icmptype = pd->hdr.icmp6->icmp6_type; 3242 icmpcode = pd->hdr.icmp6->icmp6_code; 3243 3244 if (icmptype == ICMP6_DST_UNREACH || 3245 icmptype == ICMP6_PACKET_TOO_BIG || 3246 icmptype == ICMP6_TIME_EXCEEDED || 3247 icmptype == ICMP6_PARAM_PROB) 3248 state_icmp++; 3249 break; 3250 #endif /* INET6 */ 3251 default: 3252 sport = dport = hdrlen = 0; 3253 break; 3254 } 3255 3256 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3257 3258 /* check packet for BINAT/NAT/RDR */ 3259 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, 3260 &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) { 3261 if (nk == NULL || sk == NULL) { 3262 REASON_SET(&reason, PFRES_MEMORY); 3263 goto cleanup; 3264 } 3265 3266 if (pd->ip_sum) 3267 bip_sum = *pd->ip_sum; 3268 3269 switch (pd->proto) { 3270 case IPPROTO_TCP: 3271 bproto_sum = th->th_sum; 3272 pd->proto_sum = &th->th_sum; 3273 3274 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3275 nk->port[pd->sidx] != sport) { 3276 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3277 &th->th_sum, &nk->addr[pd->sidx], 3278 nk->port[pd->sidx], 0, af); 3279 pd->sport = &th->th_sport; 3280 sport = th->th_sport; 3281 } 3282 3283 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3284 nk->port[pd->didx] != dport) { 3285 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3286 &th->th_sum, &nk->addr[pd->didx], 3287 nk->port[pd->didx], 0, af); 3288 dport = th->th_dport; 3289 pd->dport = &th->th_dport; 3290 } 3291 rewrite++; 3292 break; 3293 case IPPROTO_UDP: 3294 bproto_sum = pd->hdr.udp->uh_sum; 3295 pd->proto_sum = &pd->hdr.udp->uh_sum; 3296 3297 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3298 nk->port[pd->sidx] != sport) { 3299 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3300 pd->ip_sum, &pd->hdr.udp->uh_sum, 3301 &nk->addr[pd->sidx], 3302 nk->port[pd->sidx], 1, af); 3303 sport = pd->hdr.udp->uh_sport; 3304 pd->sport = &pd->hdr.udp->uh_sport; 3305 } 3306 3307 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3308 nk->port[pd->didx] != dport) { 3309 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3310 pd->ip_sum, &pd->hdr.udp->uh_sum, 3311 &nk->addr[pd->didx], 3312 nk->port[pd->didx], 1, af); 3313 dport = pd->hdr.udp->uh_dport; 3314 pd->dport = &pd->hdr.udp->uh_dport; 3315 } 3316 rewrite++; 3317 break; 3318 #ifdef INET 3319 case IPPROTO_ICMP: 3320 nk->port[0] = nk->port[1]; 3321 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3322 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3323 nk->addr[pd->sidx].v4.s_addr, 0); 3324 3325 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3326 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3327 nk->addr[pd->didx].v4.s_addr, 0); 3328 3329 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3330 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3331 pd->hdr.icmp->icmp_cksum, sport, 3332 nk->port[1], 0); 3333 pd->hdr.icmp->icmp_id = nk->port[1]; 3334 pd->sport = &pd->hdr.icmp->icmp_id; 3335 } 3336 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3337 break; 3338 #endif /* INET */ 3339 #ifdef INET6 3340 case IPPROTO_ICMPV6: 3341 nk->port[0] = nk->port[1]; 3342 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3343 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3344 &nk->addr[pd->sidx], 0); 3345 3346 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3347 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3348 &nk->addr[pd->didx], 0); 3349 rewrite++; 3350 break; 3351 #endif /* INET */ 3352 default: 3353 switch (af) { 3354 #ifdef INET 3355 case AF_INET: 3356 if (PF_ANEQ(saddr, 3357 &nk->addr[pd->sidx], AF_INET)) 3358 pf_change_a(&saddr->v4.s_addr, 3359 pd->ip_sum, 3360 nk->addr[pd->sidx].v4.s_addr, 0); 3361 3362 if (PF_ANEQ(daddr, 3363 &nk->addr[pd->didx], AF_INET)) 3364 pf_change_a(&daddr->v4.s_addr, 3365 pd->ip_sum, 3366 nk->addr[pd->didx].v4.s_addr, 0); 3367 break; 3368 #endif /* INET */ 3369 #ifdef INET6 3370 case AF_INET6: 3371 if (PF_ANEQ(saddr, 3372 &nk->addr[pd->sidx], AF_INET6)) 3373 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3374 3375 if (PF_ANEQ(daddr, 3376 &nk->addr[pd->didx], AF_INET6)) 3377 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3378 break; 3379 #endif /* INET */ 3380 } 3381 break; 3382 } 3383 if (nr->natpass) 3384 r = NULL; 3385 pd->nat_rule = nr; 3386 } 3387 3388 while (r != NULL) { 3389 r->evaluations++; 3390 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3391 r = r->skip[PF_SKIP_IFP].ptr; 3392 else if (r->direction && r->direction != direction) 3393 r = r->skip[PF_SKIP_DIR].ptr; 3394 else if (r->af && r->af != af) 3395 r = r->skip[PF_SKIP_AF].ptr; 3396 else if (r->proto && r->proto != pd->proto) 3397 r = r->skip[PF_SKIP_PROTO].ptr; 3398 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3399 r->src.neg, kif)) 3400 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3401 /* tcp/udp only. port_op always 0 in other cases */ 3402 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3403 r->src.port[0], r->src.port[1], sport)) 3404 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3405 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3406 r->dst.neg, NULL)) 3407 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3408 /* tcp/udp only. port_op always 0 in other cases */ 3409 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3410 r->dst.port[0], r->dst.port[1], dport)) 3411 r = r->skip[PF_SKIP_DST_PORT].ptr; 3412 /* icmp only. type always 0 in other cases */ 3413 else if (r->type && r->type != icmptype + 1) 3414 r = TAILQ_NEXT(r, entries); 3415 /* icmp only. type always 0 in other cases */ 3416 else if (r->code && r->code != icmpcode + 1) 3417 r = TAILQ_NEXT(r, entries); 3418 else if (r->tos && !(r->tos == pd->tos)) 3419 r = TAILQ_NEXT(r, entries); 3420 else if (r->rule_flag & PFRULE_FRAGMENT) 3421 r = TAILQ_NEXT(r, entries); 3422 else if (pd->proto == IPPROTO_TCP && 3423 (r->flagset & th->th_flags) != r->flags) 3424 r = TAILQ_NEXT(r, entries); 3425 /* tcp/udp only. uid.op always 0 in other cases */ 3426 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3427 pf_socket_lookup(direction, pd), 1)) && 3428 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3429 pd->lookup.uid)) 3430 r = TAILQ_NEXT(r, entries); 3431 /* tcp/udp only. gid.op always 0 in other cases */ 3432 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3433 pf_socket_lookup(direction, pd), 1)) && 3434 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3435 pd->lookup.gid)) 3436 r = TAILQ_NEXT(r, entries); 3437 else if (r->prob && 3438 r->prob <= karc4random()) 3439 r = TAILQ_NEXT(r, entries); 3440 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3441 r = TAILQ_NEXT(r, entries); 3442 else if (r->os_fingerprint != PF_OSFP_ANY && 3443 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3444 pf_osfp_fingerprint(pd, m, off, th), 3445 r->os_fingerprint))) 3446 r = TAILQ_NEXT(r, entries); 3447 else { 3448 if (r->tag) 3449 tag = r->tag; 3450 if (r->rtableid >= 0) 3451 rtableid = r->rtableid; 3452 if (r->anchor == NULL) { 3453 match = 1; 3454 *rm = r; 3455 *am = a; 3456 *rsm = ruleset; 3457 if ((*rm)->quick) 3458 break; 3459 r = TAILQ_NEXT(r, entries); 3460 } else 3461 pf_step_into_anchor(&asd, &ruleset, 3462 PF_RULESET_FILTER, &r, &a, &match); 3463 } 3464 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3465 PF_RULESET_FILTER, &r, &a, &match)) 3466 break; 3467 } 3468 r = *rm; 3469 a = *am; 3470 ruleset = *rsm; 3471 3472 REASON_SET(&reason, PFRES_MATCH); 3473 3474 if (r->log || (nr != NULL && nr->log)) { 3475 if (rewrite) 3476 m_copyback(m, off, hdrlen, pd->hdr.any); 3477 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3478 a, ruleset, pd); 3479 } 3480 3481 if ((r->action == PF_DROP) && 3482 ((r->rule_flag & PFRULE_RETURNRST) || 3483 (r->rule_flag & PFRULE_RETURNICMP) || 3484 (r->rule_flag & PFRULE_RETURN))) { 3485 /* undo NAT changes, if they have taken place */ 3486 if (nr != NULL) { 3487 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3488 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3489 if (pd->sport) 3490 *pd->sport = sk->port[pd->sidx]; 3491 if (pd->dport) 3492 *pd->dport = sk->port[pd->didx]; 3493 if (pd->proto_sum) 3494 *pd->proto_sum = bproto_sum; 3495 if (pd->ip_sum) 3496 *pd->ip_sum = bip_sum; 3497 m_copyback(m, off, hdrlen, pd->hdr.any); 3498 } 3499 if (pd->proto == IPPROTO_TCP && 3500 ((r->rule_flag & PFRULE_RETURNRST) || 3501 (r->rule_flag & PFRULE_RETURN)) && 3502 !(th->th_flags & TH_RST)) { 3503 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3504 int len = 0; 3505 struct ip *h4; 3506 #ifdef INET6 3507 struct ip6_hdr *h6; 3508 #endif 3509 switch (af) { 3510 case AF_INET: 3511 h4 = mtod(m, struct ip *); 3512 len = h4->ip_len - off; 3513 break; 3514 #ifdef INET6 3515 case AF_INET6: 3516 h6 = mtod(m, struct ip6_hdr *); 3517 len = h6->ip6_plen - (off - sizeof(*h6)); 3518 break; 3519 #endif 3520 } 3521 3522 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3523 REASON_SET(&reason, PFRES_PROTCKSUM); 3524 else { 3525 if (th->th_flags & TH_SYN) 3526 ack++; 3527 if (th->th_flags & TH_FIN) 3528 ack++; 3529 pf_send_tcp(r, af, pd->dst, 3530 pd->src, th->th_dport, th->th_sport, 3531 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3532 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3533 } 3534 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3535 r->return_icmp) 3536 pf_send_icmp(m, r->return_icmp >> 8, 3537 r->return_icmp & 255, af, r); 3538 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3539 r->return_icmp6) 3540 pf_send_icmp(m, r->return_icmp6 >> 8, 3541 r->return_icmp6 & 255, af, r); 3542 } 3543 3544 if (r->action == PF_DROP) 3545 goto cleanup; 3546 3547 if (pf_tag_packet(m, tag, rtableid)) { 3548 REASON_SET(&reason, PFRES_MEMORY); 3549 goto cleanup; 3550 } 3551 3552 if (!state_icmp && (r->keep_state || nr != NULL || 3553 (pd->flags & PFDESC_TCP_NORM))) { 3554 int action; 3555 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m, 3556 off, sport, dport, &rewrite, kif, sm, tag, bproto_sum, 3557 bip_sum, hdrlen); 3558 if (action != PF_PASS) 3559 return (action); 3560 } 3561 3562 /* copy back packet headers if we performed NAT operations */ 3563 if (rewrite) 3564 m_copyback(m, off, hdrlen, pd->hdr.any); 3565 3566 return (PF_PASS); 3567 3568 cleanup: 3569 if (sk != NULL) 3570 kfree(sk, M_PFSTATEKEYPL); 3571 if (nk != NULL) 3572 kfree(nk, M_PFSTATEKEYPL); 3573 return (PF_DROP); 3574 } 3575 3576 static __inline int 3577 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3578 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw, 3579 struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk, 3580 struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite, 3581 struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum, 3582 u_int16_t bip_sum, int hdrlen) 3583 { 3584 struct pf_state *s = NULL; 3585 struct pf_src_node *sn = NULL; 3586 struct tcphdr *th = pd->hdr.tcp; 3587 u_int16_t mss = tcp_mssdflt; 3588 u_short reason; 3589 3590 /* check maximums */ 3591 if (r->max_states && (r->states_cur >= r->max_states)) { 3592 pf_status.lcounters[LCNT_STATES]++; 3593 REASON_SET(&reason, PFRES_MAXSTATES); 3594 return (PF_DROP); 3595 } 3596 /* src node for filter rule */ 3597 if ((r->rule_flag & PFRULE_SRCTRACK || 3598 r->rpool.opts & PF_POOL_STICKYADDR) && 3599 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3600 REASON_SET(&reason, PFRES_SRCLIMIT); 3601 goto csfailed; 3602 } 3603 /* src node for translation rule */ 3604 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3605 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3606 REASON_SET(&reason, PFRES_SRCLIMIT); 3607 goto csfailed; 3608 } 3609 s = kmalloc(sizeof(struct pf_state), M_PFSTATEPL, M_NOWAIT|M_ZERO); 3610 if (s == NULL) { 3611 REASON_SET(&reason, PFRES_MEMORY); 3612 goto csfailed; 3613 } 3614 s->id = 0; /* XXX Do we really need that? not in OpenBSD */ 3615 s->creatorid = 0; 3616 s->rule.ptr = r; 3617 s->nat_rule.ptr = nr; 3618 s->anchor.ptr = a; 3619 STATE_INC_COUNTERS(s); 3620 if (r->allow_opts) 3621 s->state_flags |= PFSTATE_ALLOWOPTS; 3622 if (r->rule_flag & PFRULE_STATESLOPPY) 3623 s->state_flags |= PFSTATE_SLOPPY; 3624 s->log = r->log & PF_LOG_ALL; 3625 if (nr != NULL) 3626 s->log |= nr->log & PF_LOG_ALL; 3627 switch (pd->proto) { 3628 case IPPROTO_TCP: 3629 s->src.seqlo = ntohl(th->th_seq); 3630 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3631 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3632 r->keep_state == PF_STATE_MODULATE) { 3633 /* Generate sequence number modulator */ 3634 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3635 0) 3636 s->src.seqdiff = 1; 3637 pf_change_a(&th->th_seq, &th->th_sum, 3638 htonl(s->src.seqlo + s->src.seqdiff), 0); 3639 *rewrite = 1; 3640 } else 3641 s->src.seqdiff = 0; 3642 if (th->th_flags & TH_SYN) { 3643 s->src.seqhi++; 3644 s->src.wscale = pf_get_wscale(m, off, 3645 th->th_off, pd->af); 3646 } 3647 s->src.max_win = MAX(ntohs(th->th_win), 1); 3648 if (s->src.wscale & PF_WSCALE_MASK) { 3649 /* Remove scale factor from initial window */ 3650 int win = s->src.max_win; 3651 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3652 s->src.max_win = (win - 1) >> 3653 (s->src.wscale & PF_WSCALE_MASK); 3654 } 3655 if (th->th_flags & TH_FIN) 3656 s->src.seqhi++; 3657 s->dst.seqhi = 1; 3658 s->dst.max_win = 1; 3659 s->src.state = TCPS_SYN_SENT; 3660 s->dst.state = TCPS_CLOSED; 3661 s->timeout = PFTM_TCP_FIRST_PACKET; 3662 break; 3663 case IPPROTO_UDP: 3664 s->src.state = PFUDPS_SINGLE; 3665 s->dst.state = PFUDPS_NO_TRAFFIC; 3666 s->timeout = PFTM_UDP_FIRST_PACKET; 3667 break; 3668 case IPPROTO_ICMP: 3669 #ifdef INET6 3670 case IPPROTO_ICMPV6: 3671 #endif 3672 s->timeout = PFTM_ICMP_FIRST_PACKET; 3673 break; 3674 default: 3675 s->src.state = PFOTHERS_SINGLE; 3676 s->dst.state = PFOTHERS_NO_TRAFFIC; 3677 s->timeout = PFTM_OTHER_FIRST_PACKET; 3678 } 3679 3680 s->creation = time_second; 3681 s->expire = time_second; 3682 3683 if (sn != NULL) { 3684 s->src_node = sn; 3685 s->src_node->states++; 3686 } 3687 if (nsn != NULL) { 3688 /* XXX We only modify one side for now. */ 3689 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3690 s->nat_src_node = nsn; 3691 s->nat_src_node->states++; 3692 } 3693 if (pd->proto == IPPROTO_TCP) { 3694 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3695 off, pd, th, &s->src, &s->dst)) { 3696 REASON_SET(&reason, PFRES_MEMORY); 3697 pf_src_tree_remove_state(s); 3698 STATE_DEC_COUNTERS(s); 3699 kfree(s, M_PFSTATEPL); 3700 return (PF_DROP); 3701 } 3702 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3703 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3704 &s->src, &s->dst, rewrite)) { 3705 /* This really shouldn't happen!!! */ 3706 DPFPRINTF(PF_DEBUG_URGENT, 3707 ("pf_normalize_tcp_stateful failed on first pkt")); 3708 pf_normalize_tcp_cleanup(s); 3709 pf_src_tree_remove_state(s); 3710 STATE_DEC_COUNTERS(s); 3711 kfree(s, M_PFSTATEPL); 3712 return (PF_DROP); 3713 } 3714 } 3715 s->direction = pd->dir; 3716 3717 if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk, 3718 pd->src, pd->dst, sport, dport)) 3719 goto csfailed; 3720 3721 if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) { 3722 if (pd->proto == IPPROTO_TCP) 3723 pf_normalize_tcp_cleanup(s); 3724 REASON_SET(&reason, PFRES_STATEINS); 3725 pf_src_tree_remove_state(s); 3726 STATE_DEC_COUNTERS(s); 3727 kfree(s, M_PFSTATEPL); 3728 return (PF_DROP); 3729 } else 3730 *sm = s; 3731 3732 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 3733 if (tag > 0) { 3734 pf_tag_ref(tag); 3735 s->tag = tag; 3736 } 3737 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3738 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3739 s->src.state = PF_TCPS_PROXY_SRC; 3740 /* undo NAT changes, if they have taken place */ 3741 if (nr != NULL) { 3742 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3743 if (pd->dir == PF_OUT) 3744 skt = s->key[PF_SK_STACK]; 3745 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3746 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3747 if (pd->sport) 3748 *pd->sport = skt->port[pd->sidx]; 3749 if (pd->dport) 3750 *pd->dport = skt->port[pd->didx]; 3751 if (pd->proto_sum) 3752 *pd->proto_sum = bproto_sum; 3753 if (pd->ip_sum) 3754 *pd->ip_sum = bip_sum; 3755 m_copyback(m, off, hdrlen, pd->hdr.any); 3756 } 3757 s->src.seqhi = htonl(karc4random()); 3758 /* Find mss option */ 3759 mss = pf_get_mss(m, off, th->th_off, pd->af); 3760 mss = pf_calc_mss(pd->src, pd->af, mss); 3761 mss = pf_calc_mss(pd->dst, pd->af, mss); 3762 s->src.mss = mss; 3763 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 3764 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3765 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3766 REASON_SET(&reason, PFRES_SYNPROXY); 3767 return (PF_SYNPROXY_DROP); 3768 } 3769 3770 return (PF_PASS); 3771 3772 csfailed: 3773 if (sk != NULL) 3774 kfree(sk, M_PFSTATEKEYPL); 3775 if (nk != NULL) 3776 kfree(nk, M_PFSTATEKEYPL); 3777 3778 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3779 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3780 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3781 pf_status.src_nodes--; 3782 kfree(sn, M_PFSRCTREEPL); 3783 } 3784 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 3785 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3786 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3787 pf_status.src_nodes--; 3788 kfree(nsn, M_PFSRCTREEPL); 3789 } 3790 return (PF_DROP); 3791 } 3792 3793 int 3794 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3795 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3796 struct pf_ruleset **rsm) 3797 { 3798 struct pf_rule *r, *a = NULL; 3799 struct pf_ruleset *ruleset = NULL; 3800 sa_family_t af = pd->af; 3801 u_short reason; 3802 int tag = -1; 3803 int asd = 0; 3804 int match = 0; 3805 3806 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3807 while (r != NULL) { 3808 r->evaluations++; 3809 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3810 r = r->skip[PF_SKIP_IFP].ptr; 3811 else if (r->direction && r->direction != direction) 3812 r = r->skip[PF_SKIP_DIR].ptr; 3813 else if (r->af && r->af != af) 3814 r = r->skip[PF_SKIP_AF].ptr; 3815 else if (r->proto && r->proto != pd->proto) 3816 r = r->skip[PF_SKIP_PROTO].ptr; 3817 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3818 r->src.neg, kif)) 3819 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3820 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3821 r->dst.neg, NULL)) 3822 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3823 else if (r->tos && !(r->tos == pd->tos)) 3824 r = TAILQ_NEXT(r, entries); 3825 else if (r->os_fingerprint != PF_OSFP_ANY) 3826 r = TAILQ_NEXT(r, entries); 3827 else if (pd->proto == IPPROTO_UDP && 3828 (r->src.port_op || r->dst.port_op)) 3829 r = TAILQ_NEXT(r, entries); 3830 else if (pd->proto == IPPROTO_TCP && 3831 (r->src.port_op || r->dst.port_op || r->flagset)) 3832 r = TAILQ_NEXT(r, entries); 3833 else if ((pd->proto == IPPROTO_ICMP || 3834 pd->proto == IPPROTO_ICMPV6) && 3835 (r->type || r->code)) 3836 r = TAILQ_NEXT(r, entries); 3837 else if (r->prob && r->prob <= karc4random()) 3838 r = TAILQ_NEXT(r, entries); 3839 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3840 r = TAILQ_NEXT(r, entries); 3841 else { 3842 if (r->anchor == NULL) { 3843 match = 1; 3844 *rm = r; 3845 *am = a; 3846 *rsm = ruleset; 3847 if ((*rm)->quick) 3848 break; 3849 r = TAILQ_NEXT(r, entries); 3850 } else 3851 pf_step_into_anchor(&asd, &ruleset, 3852 PF_RULESET_FILTER, &r, &a, &match); 3853 } 3854 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3855 PF_RULESET_FILTER, &r, &a, &match)) 3856 break; 3857 } 3858 r = *rm; 3859 a = *am; 3860 ruleset = *rsm; 3861 3862 REASON_SET(&reason, PFRES_MATCH); 3863 3864 if (r->log) 3865 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 3866 pd); 3867 3868 if (r->action != PF_PASS) 3869 return (PF_DROP); 3870 3871 if (pf_tag_packet(m, tag, -1)) { 3872 REASON_SET(&reason, PFRES_MEMORY); 3873 return (PF_DROP); 3874 } 3875 3876 return (PF_PASS); 3877 } 3878 3879 int 3880 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3881 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3882 struct pf_pdesc *pd, u_short *reason, int *copyback) 3883 { 3884 struct tcphdr *th = pd->hdr.tcp; 3885 u_int16_t win = ntohs(th->th_win); 3886 u_int32_t ack, end, seq, orig_seq; 3887 u_int8_t sws, dws; 3888 int ackskew; 3889 3890 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3891 sws = src->wscale & PF_WSCALE_MASK; 3892 dws = dst->wscale & PF_WSCALE_MASK; 3893 } else 3894 sws = dws = 0; 3895 3896 /* 3897 * Sequence tracking algorithm from Guido van Rooij's paper: 3898 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3899 * tcp_filtering.ps 3900 */ 3901 3902 orig_seq = seq = ntohl(th->th_seq); 3903 if (src->seqlo == 0) { 3904 /* First packet from this end. Set its state */ 3905 3906 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3907 src->scrub == NULL) { 3908 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3909 REASON_SET(reason, PFRES_MEMORY); 3910 return (PF_DROP); 3911 } 3912 } 3913 3914 /* Deferred generation of sequence number modulator */ 3915 if (dst->seqdiff && !src->seqdiff) { 3916 /* use random iss for the TCP server */ 3917 while ((src->seqdiff = karc4random() - seq) == 0) 3918 ; 3919 ack = ntohl(th->th_ack) - dst->seqdiff; 3920 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3921 src->seqdiff), 0); 3922 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3923 *copyback = 1; 3924 } else { 3925 ack = ntohl(th->th_ack); 3926 } 3927 3928 end = seq + pd->p_len; 3929 if (th->th_flags & TH_SYN) { 3930 end++; 3931 (*state)->sync_flags |= PFSTATE_GOT_SYN2; 3932 if (dst->wscale & PF_WSCALE_FLAG) { 3933 src->wscale = pf_get_wscale(m, off, th->th_off, 3934 pd->af); 3935 if (src->wscale & PF_WSCALE_FLAG) { 3936 /* Remove scale factor from initial 3937 * window */ 3938 sws = src->wscale & PF_WSCALE_MASK; 3939 win = ((u_int32_t)win + (1 << sws) - 1) 3940 >> sws; 3941 dws = dst->wscale & PF_WSCALE_MASK; 3942 } else { 3943 /* fixup other window */ 3944 dst->max_win <<= dst->wscale & 3945 PF_WSCALE_MASK; 3946 /* in case of a retrans SYN|ACK */ 3947 dst->wscale = 0; 3948 } 3949 } 3950 } 3951 if (th->th_flags & TH_FIN) 3952 end++; 3953 3954 src->seqlo = seq; 3955 if (src->state < TCPS_SYN_SENT) 3956 src->state = TCPS_SYN_SENT; 3957 3958 /* 3959 * May need to slide the window (seqhi may have been set by 3960 * the crappy stack check or if we picked up the connection 3961 * after establishment) 3962 */ 3963 if (src->seqhi == 1 || 3964 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3965 src->seqhi = end + MAX(1, dst->max_win << dws); 3966 if (win > src->max_win) 3967 src->max_win = win; 3968 3969 } else { 3970 ack = ntohl(th->th_ack) - dst->seqdiff; 3971 if (src->seqdiff) { 3972 /* Modulate sequence numbers */ 3973 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3974 src->seqdiff), 0); 3975 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3976 *copyback = 1; 3977 } 3978 end = seq + pd->p_len; 3979 if (th->th_flags & TH_SYN) 3980 end++; 3981 if (th->th_flags & TH_FIN) 3982 end++; 3983 } 3984 3985 if ((th->th_flags & TH_ACK) == 0) { 3986 /* Let it pass through the ack skew check */ 3987 ack = dst->seqlo; 3988 } else if ((ack == 0 && 3989 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3990 /* broken tcp stacks do not set ack */ 3991 (dst->state < TCPS_SYN_SENT)) { 3992 /* 3993 * Many stacks (ours included) will set the ACK number in an 3994 * FIN|ACK if the SYN times out -- no sequence to ACK. 3995 */ 3996 ack = dst->seqlo; 3997 } 3998 3999 if (seq == end) { 4000 /* Ease sequencing restrictions on no data packets */ 4001 seq = src->seqlo; 4002 end = seq; 4003 } 4004 4005 ackskew = dst->seqlo - ack; 4006 4007 4008 /* 4009 * Need to demodulate the sequence numbers in any TCP SACK options 4010 * (Selective ACK). We could optionally validate the SACK values 4011 * against the current ACK window, either forwards or backwards, but 4012 * I'm not confident that SACK has been implemented properly 4013 * everywhere. It wouldn't surprise me if several stacks accidently 4014 * SACK too far backwards of previously ACKed data. There really aren't 4015 * any security implications of bad SACKing unless the target stack 4016 * doesn't validate the option length correctly. Someone trying to 4017 * spoof into a TCP connection won't bother blindly sending SACK 4018 * options anyway. 4019 */ 4020 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4021 if (pf_modulate_sack(m, off, pd, th, dst)) 4022 *copyback = 1; 4023 } 4024 4025 4026 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4027 if (SEQ_GEQ(src->seqhi, end) && 4028 /* Last octet inside other's window space */ 4029 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4030 /* Retrans: not more than one window back */ 4031 (ackskew >= -MAXACKWINDOW) && 4032 /* Acking not more than one reassembled fragment backwards */ 4033 (ackskew <= (MAXACKWINDOW << sws)) && 4034 /* Acking not more than one window forward */ 4035 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4036 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4037 (pd->flags & PFDESC_IP_REAS) == 0)) { 4038 /* Require an exact/+1 sequence match on resets when possible */ 4039 4040 if (dst->scrub || src->scrub) { 4041 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4042 *state, src, dst, copyback)) 4043 return (PF_DROP); 4044 } 4045 4046 /* update max window */ 4047 if (src->max_win < win) 4048 src->max_win = win; 4049 /* synchronize sequencing */ 4050 if (SEQ_GT(end, src->seqlo)) 4051 src->seqlo = end; 4052 /* slide the window of what the other end can send */ 4053 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4054 dst->seqhi = ack + MAX((win << sws), 1); 4055 4056 4057 /* update states */ 4058 if (th->th_flags & TH_SYN) 4059 if (src->state < TCPS_SYN_SENT) 4060 src->state = TCPS_SYN_SENT; 4061 if (th->th_flags & TH_FIN) 4062 if (src->state < TCPS_CLOSING) 4063 src->state = TCPS_CLOSING; 4064 if (th->th_flags & TH_ACK) { 4065 if (dst->state == TCPS_SYN_SENT) { 4066 dst->state = TCPS_ESTABLISHED; 4067 if (src->state == TCPS_ESTABLISHED && 4068 (*state)->src_node != NULL && 4069 pf_src_connlimit(state)) { 4070 REASON_SET(reason, PFRES_SRCLIMIT); 4071 return (PF_DROP); 4072 } 4073 } else if (dst->state == TCPS_CLOSING) 4074 dst->state = TCPS_FIN_WAIT_2; 4075 } 4076 if (th->th_flags & TH_RST) 4077 src->state = dst->state = TCPS_TIME_WAIT; 4078 4079 /* update expire time */ 4080 (*state)->expire = time_second; 4081 if (src->state >= TCPS_FIN_WAIT_2 && 4082 dst->state >= TCPS_FIN_WAIT_2) 4083 (*state)->timeout = PFTM_TCP_CLOSED; 4084 else if (src->state >= TCPS_CLOSING && 4085 dst->state >= TCPS_CLOSING) 4086 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4087 else if (src->state < TCPS_ESTABLISHED || 4088 dst->state < TCPS_ESTABLISHED) 4089 (*state)->timeout = PFTM_TCP_OPENING; 4090 else if (src->state >= TCPS_CLOSING || 4091 dst->state >= TCPS_CLOSING) 4092 (*state)->timeout = PFTM_TCP_CLOSING; 4093 else 4094 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4095 4096 /* Fall through to PASS packet */ 4097 4098 } else if ((dst->state < TCPS_SYN_SENT || 4099 dst->state >= TCPS_FIN_WAIT_2 || 4100 src->state >= TCPS_FIN_WAIT_2) && 4101 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4102 /* Within a window forward of the originating packet */ 4103 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4104 /* Within a window backward of the originating packet */ 4105 4106 /* 4107 * This currently handles three situations: 4108 * 1) Stupid stacks will shotgun SYNs before their peer 4109 * replies. 4110 * 2) When PF catches an already established stream (the 4111 * firewall rebooted, the state table was flushed, routes 4112 * changed...) 4113 * 3) Packets get funky immediately after the connection 4114 * closes (this should catch Solaris spurious ACK|FINs 4115 * that web servers like to spew after a close) 4116 * 4117 * This must be a little more careful than the above code 4118 * since packet floods will also be caught here. We don't 4119 * update the TTL here to mitigate the damage of a packet 4120 * flood and so the same code can handle awkward establishment 4121 * and a loosened connection close. 4122 * In the establishment case, a correct peer response will 4123 * validate the connection, go through the normal state code 4124 * and keep updating the state TTL. 4125 */ 4126 4127 if (pf_status.debug >= PF_DEBUG_MISC) { 4128 kprintf("pf: loose state match: "); 4129 pf_print_state(*state); 4130 pf_print_flags(th->th_flags); 4131 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4132 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len, 4133 ackskew, (unsigned long long)(*state)->packets[0], 4134 (unsigned long long)(*state)->packets[1], 4135 pd->dir == PF_IN ? "in" : "out", 4136 pd->dir == (*state)->direction ? "fwd" : "rev"); 4137 } 4138 4139 if (dst->scrub || src->scrub) { 4140 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4141 *state, src, dst, copyback)) 4142 return (PF_DROP); 4143 } 4144 4145 /* update max window */ 4146 if (src->max_win < win) 4147 src->max_win = win; 4148 /* synchronize sequencing */ 4149 if (SEQ_GT(end, src->seqlo)) 4150 src->seqlo = end; 4151 /* slide the window of what the other end can send */ 4152 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4153 dst->seqhi = ack + MAX((win << sws), 1); 4154 4155 /* 4156 * Cannot set dst->seqhi here since this could be a shotgunned 4157 * SYN and not an already established connection. 4158 */ 4159 4160 if (th->th_flags & TH_FIN) 4161 if (src->state < TCPS_CLOSING) 4162 src->state = TCPS_CLOSING; 4163 if (th->th_flags & TH_RST) 4164 src->state = dst->state = TCPS_TIME_WAIT; 4165 4166 /* Fall through to PASS packet */ 4167 4168 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY || 4169 ((*state)->pickup_mode == PF_PICKUPS_ENABLED && 4170 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) != 4171 PFSTATE_GOT_SYN_MASK)) { 4172 /* 4173 * If pickup mode is hash only, do not fail on sequence checks. 4174 * 4175 * If pickup mode is enabled and we did not see the SYN in 4176 * both direction, do not fail on sequence checks because 4177 * we do not have complete information on window scale. 4178 * 4179 * Adjust expiration and fall through to PASS packet. 4180 * XXX Add a FIN check to reduce timeout? 4181 */ 4182 (*state)->expire = time_second; 4183 } else { 4184 /* 4185 * Failure processing 4186 */ 4187 if ((*state)->dst.state == TCPS_SYN_SENT && 4188 (*state)->src.state == TCPS_SYN_SENT) { 4189 /* Send RST for state mismatches during handshake */ 4190 if (!(th->th_flags & TH_RST)) 4191 pf_send_tcp((*state)->rule.ptr, pd->af, 4192 pd->dst, pd->src, th->th_dport, 4193 th->th_sport, ntohl(th->th_ack), 0, 4194 TH_RST, 0, 0, 4195 (*state)->rule.ptr->return_ttl, 1, 0, 4196 pd->eh, kif->pfik_ifp); 4197 src->seqlo = 0; 4198 src->seqhi = 1; 4199 src->max_win = 1; 4200 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4201 kprintf("pf: BAD state: "); 4202 pf_print_state(*state); 4203 pf_print_flags(th->th_flags); 4204 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4205 "pkts=%llu:%llu dir=%s,%s\n", 4206 seq, orig_seq, ack, pd->p_len, ackskew, 4207 (unsigned long long)(*state)->packets[0], 4208 (unsigned long long)(*state)->packets[1], 4209 pd->dir == PF_IN ? "in" : "out", 4210 pd->dir == (*state)->direction ? "fwd" : "rev"); 4211 kprintf("pf: State failure on: %c %c %c %c | %c %c\n", 4212 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4213 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4214 ' ': '2', 4215 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4216 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4217 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4218 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4219 } 4220 REASON_SET(reason, PFRES_BADSTATE); 4221 return (PF_DROP); 4222 } 4223 4224 return (PF_PASS); 4225 } 4226 4227 int 4228 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4229 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4230 { 4231 struct tcphdr *th = pd->hdr.tcp; 4232 4233 if (th->th_flags & TH_SYN) 4234 if (src->state < TCPS_SYN_SENT) 4235 src->state = TCPS_SYN_SENT; 4236 if (th->th_flags & TH_FIN) 4237 if (src->state < TCPS_CLOSING) 4238 src->state = TCPS_CLOSING; 4239 if (th->th_flags & TH_ACK) { 4240 if (dst->state == TCPS_SYN_SENT) { 4241 dst->state = TCPS_ESTABLISHED; 4242 if (src->state == TCPS_ESTABLISHED && 4243 (*state)->src_node != NULL && 4244 pf_src_connlimit(state)) { 4245 REASON_SET(reason, PFRES_SRCLIMIT); 4246 return (PF_DROP); 4247 } 4248 } else if (dst->state == TCPS_CLOSING) { 4249 dst->state = TCPS_FIN_WAIT_2; 4250 } else if (src->state == TCPS_SYN_SENT && 4251 dst->state < TCPS_SYN_SENT) { 4252 /* 4253 * Handle a special sloppy case where we only see one 4254 * half of the connection. If there is a ACK after 4255 * the initial SYN without ever seeing a packet from 4256 * the destination, set the connection to established. 4257 */ 4258 dst->state = src->state = TCPS_ESTABLISHED; 4259 if ((*state)->src_node != NULL && 4260 pf_src_connlimit(state)) { 4261 REASON_SET(reason, PFRES_SRCLIMIT); 4262 return (PF_DROP); 4263 } 4264 } else if (src->state == TCPS_CLOSING && 4265 dst->state == TCPS_ESTABLISHED && 4266 dst->seqlo == 0) { 4267 /* 4268 * Handle the closing of half connections where we 4269 * don't see the full bidirectional FIN/ACK+ACK 4270 * handshake. 4271 */ 4272 dst->state = TCPS_CLOSING; 4273 } 4274 } 4275 if (th->th_flags & TH_RST) 4276 src->state = dst->state = TCPS_TIME_WAIT; 4277 4278 /* update expire time */ 4279 (*state)->expire = time_second; 4280 if (src->state >= TCPS_FIN_WAIT_2 && 4281 dst->state >= TCPS_FIN_WAIT_2) 4282 (*state)->timeout = PFTM_TCP_CLOSED; 4283 else if (src->state >= TCPS_CLOSING && 4284 dst->state >= TCPS_CLOSING) 4285 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4286 else if (src->state < TCPS_ESTABLISHED || 4287 dst->state < TCPS_ESTABLISHED) 4288 (*state)->timeout = PFTM_TCP_OPENING; 4289 else if (src->state >= TCPS_CLOSING || 4290 dst->state >= TCPS_CLOSING) 4291 (*state)->timeout = PFTM_TCP_CLOSING; 4292 else 4293 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4294 4295 return (PF_PASS); 4296 } 4297 4298 int 4299 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4300 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4301 u_short *reason) 4302 { 4303 struct pf_state_key_cmp key; 4304 struct tcphdr *th = pd->hdr.tcp; 4305 int copyback = 0; 4306 struct pf_state_peer *src, *dst; 4307 struct pf_state_key *sk; 4308 4309 key.af = pd->af; 4310 key.proto = IPPROTO_TCP; 4311 if (direction == PF_IN) { /* wire side, straight */ 4312 PF_ACPY(&key.addr[0], pd->src, key.af); 4313 PF_ACPY(&key.addr[1], pd->dst, key.af); 4314 key.port[0] = th->th_sport; 4315 key.port[1] = th->th_dport; 4316 } else { /* stack side, reverse */ 4317 PF_ACPY(&key.addr[1], pd->src, key.af); 4318 PF_ACPY(&key.addr[0], pd->dst, key.af); 4319 key.port[1] = th->th_sport; 4320 key.port[0] = th->th_dport; 4321 } 4322 4323 STATE_LOOKUP(kif, &key, direction, *state, m); 4324 4325 if (direction == (*state)->direction) { 4326 src = &(*state)->src; 4327 dst = &(*state)->dst; 4328 } else { 4329 src = &(*state)->dst; 4330 dst = &(*state)->src; 4331 } 4332 4333 sk = (*state)->key[pd->didx]; 4334 4335 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4336 if (direction != (*state)->direction) { 4337 REASON_SET(reason, PFRES_SYNPROXY); 4338 return (PF_SYNPROXY_DROP); 4339 } 4340 if (th->th_flags & TH_SYN) { 4341 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4342 REASON_SET(reason, PFRES_SYNPROXY); 4343 return (PF_DROP); 4344 } 4345 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4346 pd->src, th->th_dport, th->th_sport, 4347 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4348 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4349 0, NULL, NULL); 4350 REASON_SET(reason, PFRES_SYNPROXY); 4351 return (PF_SYNPROXY_DROP); 4352 } else if (!(th->th_flags & TH_ACK) || 4353 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4354 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4355 REASON_SET(reason, PFRES_SYNPROXY); 4356 return (PF_DROP); 4357 } else if ((*state)->src_node != NULL && 4358 pf_src_connlimit(state)) { 4359 REASON_SET(reason, PFRES_SRCLIMIT); 4360 return (PF_DROP); 4361 } else 4362 (*state)->src.state = PF_TCPS_PROXY_DST; 4363 } 4364 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4365 if (direction == (*state)->direction) { 4366 if (((th->th_flags & (TH_SYN|TH_ACK)) != 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 } 4372 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4373 if ((*state)->dst.seqhi == 1) 4374 (*state)->dst.seqhi = htonl(karc4random()); 4375 pf_send_tcp((*state)->rule.ptr, pd->af, 4376 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4377 sk->port[pd->sidx], sk->port[pd->didx], 4378 (*state)->dst.seqhi, 0, TH_SYN, 0, 4379 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4380 REASON_SET(reason, PFRES_SYNPROXY); 4381 return (PF_SYNPROXY_DROP); 4382 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4383 (TH_SYN|TH_ACK)) || 4384 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4385 REASON_SET(reason, PFRES_SYNPROXY); 4386 return (PF_DROP); 4387 } else { 4388 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4389 (*state)->dst.seqlo = ntohl(th->th_seq); 4390 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4391 pd->src, th->th_dport, th->th_sport, 4392 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4393 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4394 (*state)->tag, NULL, NULL); 4395 pf_send_tcp((*state)->rule.ptr, pd->af, 4396 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4397 sk->port[pd->sidx], sk->port[pd->didx], 4398 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4399 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4400 0, NULL, NULL); 4401 (*state)->src.seqdiff = (*state)->dst.seqhi - 4402 (*state)->src.seqlo; 4403 (*state)->dst.seqdiff = (*state)->src.seqhi - 4404 (*state)->dst.seqlo; 4405 (*state)->src.seqhi = (*state)->src.seqlo + 4406 (*state)->dst.max_win; 4407 (*state)->dst.seqhi = (*state)->dst.seqlo + 4408 (*state)->src.max_win; 4409 (*state)->src.wscale = (*state)->dst.wscale = 0; 4410 (*state)->src.state = (*state)->dst.state = 4411 TCPS_ESTABLISHED; 4412 REASON_SET(reason, PFRES_SYNPROXY); 4413 return (PF_SYNPROXY_DROP); 4414 } 4415 } 4416 4417 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4418 dst->state >= TCPS_FIN_WAIT_2 && 4419 src->state >= TCPS_FIN_WAIT_2) { 4420 if (pf_status.debug >= PF_DEBUG_MISC) { 4421 kprintf("pf: state reuse "); 4422 pf_print_state(*state); 4423 pf_print_flags(th->th_flags); 4424 kprintf("\n"); 4425 } 4426 /* XXX make sure it's the same direction ?? */ 4427 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4428 pf_unlink_state(*state); 4429 *state = NULL; 4430 return (PF_DROP); 4431 } 4432 4433 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4434 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4435 return (PF_DROP); 4436 } else { 4437 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4438 ©back) == PF_DROP) 4439 return (PF_DROP); 4440 } 4441 4442 /* translate source/destination address, if necessary */ 4443 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4444 struct pf_state_key *nk = (*state)->key[pd->didx]; 4445 4446 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4447 nk->port[pd->sidx] != th->th_sport) { 4448 /* 4449 * The translated source address may be completely 4450 * unrelated to the saved link header, make sure 4451 * a bridge doesn't try to use it. 4452 */ 4453 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 4454 m->m_flags &= ~M_HASH; 4455 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4456 &th->th_sum, &nk->addr[pd->sidx], 4457 nk->port[pd->sidx], 0, pd->af); 4458 } 4459 4460 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4461 nk->port[pd->didx] != th->th_dport) { 4462 /* 4463 * If we don't redispatch the packet will go into 4464 * the protocol stack on the wrong cpu for the 4465 * post-translated address. 4466 */ 4467 m->m_flags &= ~M_HASH; 4468 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4469 &th->th_sum, &nk->addr[pd->didx], 4470 nk->port[pd->didx], 0, pd->af); 4471 } 4472 copyback = 1; 4473 } 4474 4475 /* Copyback sequence modulation or stateful scrub changes if needed */ 4476 if (copyback) 4477 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4478 4479 return (PF_PASS); 4480 } 4481 4482 int 4483 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4484 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4485 { 4486 struct pf_state_peer *src, *dst; 4487 struct pf_state_key_cmp key; 4488 struct udphdr *uh = pd->hdr.udp; 4489 4490 key.af = pd->af; 4491 key.proto = IPPROTO_UDP; 4492 if (direction == PF_IN) { /* wire side, straight */ 4493 PF_ACPY(&key.addr[0], pd->src, key.af); 4494 PF_ACPY(&key.addr[1], pd->dst, key.af); 4495 key.port[0] = uh->uh_sport; 4496 key.port[1] = uh->uh_dport; 4497 } else { /* stack side, reverse */ 4498 PF_ACPY(&key.addr[1], pd->src, key.af); 4499 PF_ACPY(&key.addr[0], pd->dst, key.af); 4500 key.port[1] = uh->uh_sport; 4501 key.port[0] = uh->uh_dport; 4502 } 4503 4504 STATE_LOOKUP(kif, &key, direction, *state, m); 4505 4506 if (direction == (*state)->direction) { 4507 src = &(*state)->src; 4508 dst = &(*state)->dst; 4509 } else { 4510 src = &(*state)->dst; 4511 dst = &(*state)->src; 4512 } 4513 4514 /* update states */ 4515 if (src->state < PFUDPS_SINGLE) 4516 src->state = PFUDPS_SINGLE; 4517 if (dst->state == PFUDPS_SINGLE) 4518 dst->state = PFUDPS_MULTIPLE; 4519 4520 /* update expire time */ 4521 (*state)->expire = time_second; 4522 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4523 (*state)->timeout = PFTM_UDP_MULTIPLE; 4524 else 4525 (*state)->timeout = PFTM_UDP_SINGLE; 4526 4527 /* translate source/destination address, if necessary */ 4528 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4529 struct pf_state_key *nk = (*state)->key[pd->didx]; 4530 4531 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4532 nk->port[pd->sidx] != uh->uh_sport) { 4533 /* 4534 * The translated source address may be completely 4535 * unrelated to the saved link header, make sure 4536 * a bridge doesn't try to use it. 4537 */ 4538 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 4539 m->m_flags &= ~M_HASH; 4540 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4541 &uh->uh_sum, &nk->addr[pd->sidx], 4542 nk->port[pd->sidx], 1, pd->af); 4543 } 4544 4545 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4546 nk->port[pd->didx] != uh->uh_dport) { 4547 /* 4548 * If we don't redispatch the packet will go into 4549 * the protocol stack on the wrong cpu for the 4550 * post-translated address. 4551 */ 4552 m->m_flags &= ~M_HASH; 4553 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4554 &uh->uh_sum, &nk->addr[pd->didx], 4555 nk->port[pd->didx], 1, pd->af); 4556 } 4557 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4558 } 4559 4560 return (PF_PASS); 4561 } 4562 4563 int 4564 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4565 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4566 { 4567 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4568 u_int16_t icmpid = 0, *icmpsum; 4569 u_int8_t icmptype; 4570 int state_icmp = 0; 4571 struct pf_state_key_cmp key; 4572 4573 switch (pd->proto) { 4574 #ifdef INET 4575 case IPPROTO_ICMP: 4576 icmptype = pd->hdr.icmp->icmp_type; 4577 icmpid = pd->hdr.icmp->icmp_id; 4578 icmpsum = &pd->hdr.icmp->icmp_cksum; 4579 4580 if (icmptype == ICMP_UNREACH || 4581 icmptype == ICMP_SOURCEQUENCH || 4582 icmptype == ICMP_REDIRECT || 4583 icmptype == ICMP_TIMXCEED || 4584 icmptype == ICMP_PARAMPROB) 4585 state_icmp++; 4586 break; 4587 #endif /* INET */ 4588 #ifdef INET6 4589 case IPPROTO_ICMPV6: 4590 icmptype = pd->hdr.icmp6->icmp6_type; 4591 icmpid = pd->hdr.icmp6->icmp6_id; 4592 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4593 4594 if (icmptype == ICMP6_DST_UNREACH || 4595 icmptype == ICMP6_PACKET_TOO_BIG || 4596 icmptype == ICMP6_TIME_EXCEEDED || 4597 icmptype == ICMP6_PARAM_PROB) 4598 state_icmp++; 4599 break; 4600 #endif /* INET6 */ 4601 } 4602 4603 if (!state_icmp) { 4604 4605 /* 4606 * ICMP query/reply message not related to a TCP/UDP packet. 4607 * Search for an ICMP state. 4608 */ 4609 key.af = pd->af; 4610 key.proto = pd->proto; 4611 key.port[0] = key.port[1] = icmpid; 4612 if (direction == PF_IN) { /* wire side, straight */ 4613 PF_ACPY(&key.addr[0], pd->src, key.af); 4614 PF_ACPY(&key.addr[1], pd->dst, key.af); 4615 } else { /* stack side, reverse */ 4616 PF_ACPY(&key.addr[1], pd->src, key.af); 4617 PF_ACPY(&key.addr[0], pd->dst, key.af); 4618 } 4619 4620 STATE_LOOKUP(kif, &key, direction, *state, m); 4621 4622 (*state)->expire = time_second; 4623 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4624 4625 /* translate source/destination address, if necessary */ 4626 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4627 struct pf_state_key *nk = (*state)->key[pd->didx]; 4628 4629 switch (pd->af) { 4630 #ifdef INET 4631 case AF_INET: 4632 if (PF_ANEQ(pd->src, 4633 &nk->addr[pd->sidx], AF_INET)) 4634 pf_change_a(&saddr->v4.s_addr, 4635 pd->ip_sum, 4636 nk->addr[pd->sidx].v4.s_addr, 0); 4637 4638 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4639 AF_INET)) 4640 pf_change_a(&daddr->v4.s_addr, 4641 pd->ip_sum, 4642 nk->addr[pd->didx].v4.s_addr, 0); 4643 4644 if (nk->port[0] != 4645 pd->hdr.icmp->icmp_id) { 4646 pd->hdr.icmp->icmp_cksum = 4647 pf_cksum_fixup( 4648 pd->hdr.icmp->icmp_cksum, icmpid, 4649 nk->port[pd->sidx], 0); 4650 pd->hdr.icmp->icmp_id = 4651 nk->port[pd->sidx]; 4652 } 4653 4654 m_copyback(m, off, ICMP_MINLEN, 4655 (caddr_t)pd->hdr.icmp); 4656 break; 4657 #endif /* INET */ 4658 #ifdef INET6 4659 case AF_INET6: 4660 if (PF_ANEQ(pd->src, 4661 &nk->addr[pd->sidx], AF_INET6)) 4662 pf_change_a6(saddr, 4663 &pd->hdr.icmp6->icmp6_cksum, 4664 &nk->addr[pd->sidx], 0); 4665 4666 if (PF_ANEQ(pd->dst, 4667 &nk->addr[pd->didx], AF_INET6)) 4668 pf_change_a6(daddr, 4669 &pd->hdr.icmp6->icmp6_cksum, 4670 &nk->addr[pd->didx], 0); 4671 4672 m_copyback(m, off, 4673 sizeof(struct icmp6_hdr), 4674 (caddr_t)pd->hdr.icmp6); 4675 break; 4676 #endif /* INET6 */ 4677 } 4678 } 4679 return (PF_PASS); 4680 4681 } else { 4682 /* 4683 * ICMP error message in response to a TCP/UDP packet. 4684 * Extract the inner TCP/UDP header and search for that state. 4685 */ 4686 4687 struct pf_pdesc pd2; 4688 #ifdef INET 4689 struct ip h2; 4690 #endif /* INET */ 4691 #ifdef INET6 4692 struct ip6_hdr h2_6; 4693 int terminal = 0; 4694 #endif /* INET6 */ 4695 int ipoff2; 4696 int off2; 4697 4698 pd2.af = pd->af; 4699 /* Payload packet is from the opposite direction. */ 4700 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4701 pd2.didx = (direction == PF_IN) ? 0 : 1; 4702 switch (pd->af) { 4703 #ifdef INET 4704 case AF_INET: 4705 /* offset of h2 in mbuf chain */ 4706 ipoff2 = off + ICMP_MINLEN; 4707 4708 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4709 NULL, reason, pd2.af)) { 4710 DPFPRINTF(PF_DEBUG_MISC, 4711 ("pf: ICMP error message too short " 4712 "(ip)\n")); 4713 return (PF_DROP); 4714 } 4715 /* 4716 * ICMP error messages don't refer to non-first 4717 * fragments 4718 */ 4719 if (h2.ip_off & htons(IP_OFFMASK)) { 4720 REASON_SET(reason, PFRES_FRAG); 4721 return (PF_DROP); 4722 } 4723 4724 /* offset of protocol header that follows h2 */ 4725 off2 = ipoff2 + (h2.ip_hl << 2); 4726 4727 pd2.proto = h2.ip_p; 4728 pd2.src = (struct pf_addr *)&h2.ip_src; 4729 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4730 pd2.ip_sum = &h2.ip_sum; 4731 break; 4732 #endif /* INET */ 4733 #ifdef INET6 4734 case AF_INET6: 4735 ipoff2 = off + sizeof(struct icmp6_hdr); 4736 4737 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4738 NULL, reason, pd2.af)) { 4739 DPFPRINTF(PF_DEBUG_MISC, 4740 ("pf: ICMP error message too short " 4741 "(ip6)\n")); 4742 return (PF_DROP); 4743 } 4744 pd2.proto = h2_6.ip6_nxt; 4745 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4746 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4747 pd2.ip_sum = NULL; 4748 off2 = ipoff2 + sizeof(h2_6); 4749 do { 4750 switch (pd2.proto) { 4751 case IPPROTO_FRAGMENT: 4752 /* 4753 * ICMPv6 error messages for 4754 * non-first fragments 4755 */ 4756 REASON_SET(reason, PFRES_FRAG); 4757 return (PF_DROP); 4758 case IPPROTO_AH: 4759 case IPPROTO_HOPOPTS: 4760 case IPPROTO_ROUTING: 4761 case IPPROTO_DSTOPTS: { 4762 /* get next header and header length */ 4763 struct ip6_ext opt6; 4764 4765 if (!pf_pull_hdr(m, off2, &opt6, 4766 sizeof(opt6), NULL, reason, 4767 pd2.af)) { 4768 DPFPRINTF(PF_DEBUG_MISC, 4769 ("pf: ICMPv6 short opt\n")); 4770 return (PF_DROP); 4771 } 4772 if (pd2.proto == IPPROTO_AH) 4773 off2 += (opt6.ip6e_len + 2) * 4; 4774 else 4775 off2 += (opt6.ip6e_len + 1) * 8; 4776 pd2.proto = opt6.ip6e_nxt; 4777 /* goto the next header */ 4778 break; 4779 } 4780 default: 4781 terminal++; 4782 break; 4783 } 4784 } while (!terminal); 4785 break; 4786 #endif /* INET6 */ 4787 default: 4788 DPFPRINTF(PF_DEBUG_MISC, 4789 ("pf: ICMP AF %d unknown (ip6)\n", pd->af)); 4790 return (PF_DROP); 4791 break; 4792 } 4793 4794 switch (pd2.proto) { 4795 case IPPROTO_TCP: { 4796 struct tcphdr th; 4797 u_int32_t seq; 4798 struct pf_state_peer *src, *dst; 4799 u_int8_t dws; 4800 int copyback = 0; 4801 4802 /* 4803 * Only the first 8 bytes of the TCP header can be 4804 * expected. Don't access any TCP header fields after 4805 * th_seq, an ackskew test is not possible. 4806 */ 4807 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4808 pd2.af)) { 4809 DPFPRINTF(PF_DEBUG_MISC, 4810 ("pf: ICMP error message too short " 4811 "(tcp)\n")); 4812 return (PF_DROP); 4813 } 4814 4815 key.af = pd2.af; 4816 key.proto = IPPROTO_TCP; 4817 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4818 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4819 key.port[pd2.sidx] = th.th_sport; 4820 key.port[pd2.didx] = th.th_dport; 4821 4822 STATE_LOOKUP(kif, &key, direction, *state, m); 4823 4824 if (direction == (*state)->direction) { 4825 src = &(*state)->dst; 4826 dst = &(*state)->src; 4827 } else { 4828 src = &(*state)->src; 4829 dst = &(*state)->dst; 4830 } 4831 4832 if (src->wscale && dst->wscale) 4833 dws = dst->wscale & PF_WSCALE_MASK; 4834 else 4835 dws = 0; 4836 4837 /* Demodulate sequence number */ 4838 seq = ntohl(th.th_seq) - src->seqdiff; 4839 if (src->seqdiff) { 4840 pf_change_a(&th.th_seq, icmpsum, 4841 htonl(seq), 0); 4842 copyback = 1; 4843 } 4844 4845 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4846 (!SEQ_GEQ(src->seqhi, seq) || 4847 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4848 if (pf_status.debug >= PF_DEBUG_MISC) { 4849 kprintf("pf: BAD ICMP %d:%d ", 4850 icmptype, pd->hdr.icmp->icmp_code); 4851 pf_print_host(pd->src, 0, pd->af); 4852 kprintf(" -> "); 4853 pf_print_host(pd->dst, 0, pd->af); 4854 kprintf(" state: "); 4855 pf_print_state(*state); 4856 kprintf(" seq=%u\n", seq); 4857 } 4858 REASON_SET(reason, PFRES_BADSTATE); 4859 return (PF_DROP); 4860 } else { 4861 if (pf_status.debug >= PF_DEBUG_MISC) { 4862 kprintf("pf: OK ICMP %d:%d ", 4863 icmptype, pd->hdr.icmp->icmp_code); 4864 pf_print_host(pd->src, 0, pd->af); 4865 kprintf(" -> "); 4866 pf_print_host(pd->dst, 0, pd->af); 4867 kprintf(" state: "); 4868 pf_print_state(*state); 4869 kprintf(" seq=%u\n", seq); 4870 } 4871 } 4872 4873 /* translate source/destination address, if necessary */ 4874 if ((*state)->key[PF_SK_WIRE] != 4875 (*state)->key[PF_SK_STACK]) { 4876 struct pf_state_key *nk = 4877 (*state)->key[pd->didx]; 4878 4879 if (PF_ANEQ(pd2.src, 4880 &nk->addr[pd2.sidx], pd2.af) || 4881 nk->port[pd2.sidx] != th.th_sport) 4882 pf_change_icmp(pd2.src, &th.th_sport, 4883 daddr, &nk->addr[pd2.sidx], 4884 nk->port[pd2.sidx], NULL, 4885 pd2.ip_sum, icmpsum, 4886 pd->ip_sum, 0, pd2.af); 4887 4888 if (PF_ANEQ(pd2.dst, 4889 &nk->addr[pd2.didx], pd2.af) || 4890 nk->port[pd2.didx] != th.th_dport) 4891 pf_change_icmp(pd2.dst, &th.th_dport, 4892 NULL, /* XXX Inbound NAT? */ 4893 &nk->addr[pd2.didx], 4894 nk->port[pd2.didx], NULL, 4895 pd2.ip_sum, icmpsum, 4896 pd->ip_sum, 0, pd2.af); 4897 copyback = 1; 4898 } 4899 4900 if (copyback) { 4901 switch (pd2.af) { 4902 #ifdef INET 4903 case AF_INET: 4904 m_copyback(m, off, ICMP_MINLEN, 4905 (caddr_t)pd->hdr.icmp); 4906 m_copyback(m, ipoff2, sizeof(h2), 4907 (caddr_t)&h2); 4908 break; 4909 #endif /* INET */ 4910 #ifdef INET6 4911 case AF_INET6: 4912 m_copyback(m, off, 4913 sizeof(struct icmp6_hdr), 4914 (caddr_t)pd->hdr.icmp6); 4915 m_copyback(m, ipoff2, sizeof(h2_6), 4916 (caddr_t)&h2_6); 4917 break; 4918 #endif /* INET6 */ 4919 } 4920 m_copyback(m, off2, 8, (caddr_t)&th); 4921 } 4922 4923 return (PF_PASS); 4924 break; 4925 } 4926 case IPPROTO_UDP: { 4927 struct udphdr uh; 4928 4929 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4930 NULL, reason, pd2.af)) { 4931 DPFPRINTF(PF_DEBUG_MISC, 4932 ("pf: ICMP error message too short " 4933 "(udp)\n")); 4934 return (PF_DROP); 4935 } 4936 4937 key.af = pd2.af; 4938 key.proto = IPPROTO_UDP; 4939 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4940 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4941 key.port[pd2.sidx] = uh.uh_sport; 4942 key.port[pd2.didx] = uh.uh_dport; 4943 4944 STATE_LOOKUP(kif, &key, direction, *state, m); 4945 4946 /* translate source/destination address, if necessary */ 4947 if ((*state)->key[PF_SK_WIRE] != 4948 (*state)->key[PF_SK_STACK]) { 4949 struct pf_state_key *nk = 4950 (*state)->key[pd->didx]; 4951 4952 if (PF_ANEQ(pd2.src, 4953 &nk->addr[pd2.sidx], pd2.af) || 4954 nk->port[pd2.sidx] != uh.uh_sport) 4955 pf_change_icmp(pd2.src, &uh.uh_sport, 4956 daddr, &nk->addr[pd2.sidx], 4957 nk->port[pd2.sidx], &uh.uh_sum, 4958 pd2.ip_sum, icmpsum, 4959 pd->ip_sum, 1, pd2.af); 4960 4961 if (PF_ANEQ(pd2.dst, 4962 &nk->addr[pd2.didx], pd2.af) || 4963 nk->port[pd2.didx] != uh.uh_dport) 4964 pf_change_icmp(pd2.dst, &uh.uh_dport, 4965 NULL, /* XXX Inbound NAT? */ 4966 &nk->addr[pd2.didx], 4967 nk->port[pd2.didx], &uh.uh_sum, 4968 pd2.ip_sum, icmpsum, 4969 pd->ip_sum, 1, pd2.af); 4970 4971 switch (pd2.af) { 4972 #ifdef INET 4973 case AF_INET: 4974 m_copyback(m, off, ICMP_MINLEN, 4975 (caddr_t)pd->hdr.icmp); 4976 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4977 break; 4978 #endif /* INET */ 4979 #ifdef INET6 4980 case AF_INET6: 4981 m_copyback(m, off, 4982 sizeof(struct icmp6_hdr), 4983 (caddr_t)pd->hdr.icmp6); 4984 m_copyback(m, ipoff2, sizeof(h2_6), 4985 (caddr_t)&h2_6); 4986 break; 4987 #endif /* INET6 */ 4988 } 4989 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4990 } 4991 4992 return (PF_PASS); 4993 break; 4994 } 4995 #ifdef INET 4996 case IPPROTO_ICMP: { 4997 struct icmp iih; 4998 4999 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5000 NULL, reason, pd2.af)) { 5001 DPFPRINTF(PF_DEBUG_MISC, 5002 ("pf: ICMP error message too short i" 5003 "(icmp)\n")); 5004 return (PF_DROP); 5005 } 5006 5007 key.af = pd2.af; 5008 key.proto = IPPROTO_ICMP; 5009 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5010 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5011 key.port[0] = key.port[1] = iih.icmp_id; 5012 5013 STATE_LOOKUP(kif, &key, direction, *state, m); 5014 5015 /* translate source/destination address, if necessary */ 5016 if ((*state)->key[PF_SK_WIRE] != 5017 (*state)->key[PF_SK_STACK]) { 5018 struct pf_state_key *nk = 5019 (*state)->key[pd->didx]; 5020 5021 if (PF_ANEQ(pd2.src, 5022 &nk->addr[pd2.sidx], pd2.af) || 5023 nk->port[pd2.sidx] != iih.icmp_id) 5024 pf_change_icmp(pd2.src, &iih.icmp_id, 5025 daddr, &nk->addr[pd2.sidx], 5026 nk->port[pd2.sidx], NULL, 5027 pd2.ip_sum, icmpsum, 5028 pd->ip_sum, 0, AF_INET); 5029 5030 if (PF_ANEQ(pd2.dst, 5031 &nk->addr[pd2.didx], pd2.af) || 5032 nk->port[pd2.didx] != iih.icmp_id) 5033 pf_change_icmp(pd2.dst, &iih.icmp_id, 5034 NULL, /* XXX Inbound NAT? */ 5035 &nk->addr[pd2.didx], 5036 nk->port[pd2.didx], NULL, 5037 pd2.ip_sum, icmpsum, 5038 pd->ip_sum, 0, AF_INET); 5039 5040 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 5041 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5042 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 5043 } 5044 return (PF_PASS); 5045 break; 5046 } 5047 #endif /* INET */ 5048 #ifdef INET6 5049 case IPPROTO_ICMPV6: { 5050 struct icmp6_hdr iih; 5051 5052 if (!pf_pull_hdr(m, off2, &iih, 5053 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5054 DPFPRINTF(PF_DEBUG_MISC, 5055 ("pf: ICMP error message too short " 5056 "(icmp6)\n")); 5057 return (PF_DROP); 5058 } 5059 5060 key.af = pd2.af; 5061 key.proto = IPPROTO_ICMPV6; 5062 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5063 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5064 key.port[0] = key.port[1] = iih.icmp6_id; 5065 5066 STATE_LOOKUP(kif, &key, direction, *state, m); 5067 5068 /* translate source/destination address, if necessary */ 5069 if ((*state)->key[PF_SK_WIRE] != 5070 (*state)->key[PF_SK_STACK]) { 5071 struct pf_state_key *nk = 5072 (*state)->key[pd->didx]; 5073 5074 if (PF_ANEQ(pd2.src, 5075 &nk->addr[pd2.sidx], pd2.af) || 5076 nk->port[pd2.sidx] != iih.icmp6_id) 5077 pf_change_icmp(pd2.src, &iih.icmp6_id, 5078 daddr, &nk->addr[pd2.sidx], 5079 nk->port[pd2.sidx], NULL, 5080 pd2.ip_sum, icmpsum, 5081 pd->ip_sum, 0, AF_INET6); 5082 5083 if (PF_ANEQ(pd2.dst, 5084 &nk->addr[pd2.didx], pd2.af) || 5085 nk->port[pd2.didx] != iih.icmp6_id) 5086 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5087 NULL, /* XXX Inbound NAT? */ 5088 &nk->addr[pd2.didx], 5089 nk->port[pd2.didx], NULL, 5090 pd2.ip_sum, icmpsum, 5091 pd->ip_sum, 0, AF_INET6); 5092 5093 m_copyback(m, off, sizeof(struct icmp6_hdr), 5094 (caddr_t)pd->hdr.icmp6); 5095 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5096 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5097 (caddr_t)&iih); 5098 } 5099 5100 return (PF_PASS); 5101 break; 5102 } 5103 #endif /* INET6 */ 5104 default: { 5105 key.af = pd2.af; 5106 key.proto = pd2.proto; 5107 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5108 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5109 key.port[0] = key.port[1] = 0; 5110 5111 STATE_LOOKUP(kif, &key, direction, *state, m); 5112 5113 /* translate source/destination address, if necessary */ 5114 if ((*state)->key[PF_SK_WIRE] != 5115 (*state)->key[PF_SK_STACK]) { 5116 struct pf_state_key *nk = 5117 (*state)->key[pd->didx]; 5118 5119 if (PF_ANEQ(pd2.src, 5120 &nk->addr[pd2.sidx], pd2.af)) 5121 pf_change_icmp(pd2.src, NULL, daddr, 5122 &nk->addr[pd2.sidx], 0, NULL, 5123 pd2.ip_sum, icmpsum, 5124 pd->ip_sum, 0, pd2.af); 5125 5126 if (PF_ANEQ(pd2.dst, 5127 &nk->addr[pd2.didx], pd2.af)) 5128 pf_change_icmp(pd2.src, NULL, 5129 NULL, /* XXX Inbound NAT? */ 5130 &nk->addr[pd2.didx], 0, NULL, 5131 pd2.ip_sum, icmpsum, 5132 pd->ip_sum, 0, pd2.af); 5133 5134 switch (pd2.af) { 5135 #ifdef INET 5136 case AF_INET: 5137 m_copyback(m, off, ICMP_MINLEN, 5138 (caddr_t)pd->hdr.icmp); 5139 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5140 break; 5141 #endif /* INET */ 5142 #ifdef INET6 5143 case AF_INET6: 5144 m_copyback(m, off, 5145 sizeof(struct icmp6_hdr), 5146 (caddr_t)pd->hdr.icmp6); 5147 m_copyback(m, ipoff2, sizeof(h2_6), 5148 (caddr_t)&h2_6); 5149 break; 5150 #endif /* INET6 */ 5151 } 5152 } 5153 return (PF_PASS); 5154 break; 5155 } 5156 } 5157 } 5158 } 5159 5160 int 5161 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5162 struct mbuf *m, struct pf_pdesc *pd) 5163 { 5164 struct pf_state_peer *src, *dst; 5165 struct pf_state_key_cmp key; 5166 5167 key.af = pd->af; 5168 key.proto = pd->proto; 5169 if (direction == PF_IN) { 5170 PF_ACPY(&key.addr[0], pd->src, key.af); 5171 PF_ACPY(&key.addr[1], pd->dst, key.af); 5172 key.port[0] = key.port[1] = 0; 5173 } else { 5174 PF_ACPY(&key.addr[1], pd->src, key.af); 5175 PF_ACPY(&key.addr[0], pd->dst, key.af); 5176 key.port[1] = key.port[0] = 0; 5177 } 5178 5179 STATE_LOOKUP(kif, &key, direction, *state, m); 5180 5181 if (direction == (*state)->direction) { 5182 src = &(*state)->src; 5183 dst = &(*state)->dst; 5184 } else { 5185 src = &(*state)->dst; 5186 dst = &(*state)->src; 5187 } 5188 5189 /* update states */ 5190 if (src->state < PFOTHERS_SINGLE) 5191 src->state = PFOTHERS_SINGLE; 5192 if (dst->state == PFOTHERS_SINGLE) 5193 dst->state = PFOTHERS_MULTIPLE; 5194 5195 /* update expire time */ 5196 (*state)->expire = time_second; 5197 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5198 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5199 else 5200 (*state)->timeout = PFTM_OTHER_SINGLE; 5201 5202 /* translate source/destination address, if necessary */ 5203 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5204 struct pf_state_key *nk = (*state)->key[pd->didx]; 5205 5206 KKASSERT(nk); 5207 KKASSERT(pd); 5208 KKASSERT(pd->src); 5209 KKASSERT(pd->dst); 5210 switch (pd->af) { 5211 #ifdef INET 5212 case AF_INET: 5213 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5214 pf_change_a(&pd->src->v4.s_addr, 5215 pd->ip_sum, 5216 nk->addr[pd->sidx].v4.s_addr, 5217 0); 5218 5219 5220 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5221 pf_change_a(&pd->dst->v4.s_addr, 5222 pd->ip_sum, 5223 nk->addr[pd->didx].v4.s_addr, 5224 0); 5225 5226 break; 5227 #endif /* INET */ 5228 #ifdef INET6 5229 case AF_INET6: 5230 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5231 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5232 5233 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5234 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5235 #endif /* INET6 */ 5236 } 5237 } 5238 return (PF_PASS); 5239 } 5240 5241 /* 5242 * ipoff and off are measured from the start of the mbuf chain. 5243 * h must be at "ipoff" on the mbuf chain. 5244 */ 5245 void * 5246 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5247 u_short *actionp, u_short *reasonp, sa_family_t af) 5248 { 5249 switch (af) { 5250 #ifdef INET 5251 case AF_INET: { 5252 struct ip *h = mtod(m, struct ip *); 5253 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3; 5254 5255 if (fragoff) { 5256 if (fragoff >= len) 5257 ACTION_SET(actionp, PF_PASS); 5258 else { 5259 ACTION_SET(actionp, PF_DROP); 5260 REASON_SET(reasonp, PFRES_FRAG); 5261 } 5262 return (NULL); 5263 } 5264 if (m->m_pkthdr.len < off + len || 5265 h->ip_len < off + len) { 5266 ACTION_SET(actionp, PF_DROP); 5267 REASON_SET(reasonp, PFRES_SHORT); 5268 return (NULL); 5269 } 5270 break; 5271 } 5272 #endif /* INET */ 5273 #ifdef INET6 5274 case AF_INET6: { 5275 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5276 5277 if (m->m_pkthdr.len < off + len || 5278 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5279 (unsigned)(off + len)) { 5280 ACTION_SET(actionp, PF_DROP); 5281 REASON_SET(reasonp, PFRES_SHORT); 5282 return (NULL); 5283 } 5284 break; 5285 } 5286 #endif /* INET6 */ 5287 } 5288 m_copydata(m, off, len, p); 5289 return (p); 5290 } 5291 5292 int 5293 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 5294 { 5295 struct sockaddr_in *dst; 5296 int ret = 1; 5297 int check_mpath; 5298 #ifdef INET6 5299 struct sockaddr_in6 *dst6; 5300 struct route_in6 ro; 5301 #else 5302 struct route ro; 5303 #endif 5304 struct radix_node *rn; 5305 struct rtentry *rt; 5306 struct ifnet *ifp; 5307 5308 check_mpath = 0; 5309 bzero(&ro, sizeof(ro)); 5310 switch (af) { 5311 case AF_INET: 5312 dst = satosin(&ro.ro_dst); 5313 dst->sin_family = AF_INET; 5314 dst->sin_len = sizeof(*dst); 5315 dst->sin_addr = addr->v4; 5316 break; 5317 #ifdef INET6 5318 case AF_INET6: 5319 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5320 dst6->sin6_family = AF_INET6; 5321 dst6->sin6_len = sizeof(*dst6); 5322 dst6->sin6_addr = addr->v6; 5323 break; 5324 #endif /* INET6 */ 5325 default: 5326 return (0); 5327 } 5328 5329 /* Skip checks for ipsec interfaces */ 5330 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5331 goto out; 5332 5333 rtalloc_ign((struct route *)&ro, 0); 5334 5335 if (ro.ro_rt != NULL) { 5336 /* No interface given, this is a no-route check */ 5337 if (kif == NULL) 5338 goto out; 5339 5340 if (kif->pfik_ifp == NULL) { 5341 ret = 0; 5342 goto out; 5343 } 5344 5345 /* Perform uRPF check if passed input interface */ 5346 ret = 0; 5347 rn = (struct radix_node *)ro.ro_rt; 5348 do { 5349 rt = (struct rtentry *)rn; 5350 ifp = rt->rt_ifp; 5351 5352 if (kif->pfik_ifp == ifp) 5353 ret = 1; 5354 rn = NULL; 5355 } while (check_mpath == 1 && rn != NULL && ret == 0); 5356 } else 5357 ret = 0; 5358 out: 5359 if (ro.ro_rt != NULL) 5360 RTFREE(ro.ro_rt); 5361 return (ret); 5362 } 5363 5364 int 5365 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 5366 { 5367 struct sockaddr_in *dst; 5368 #ifdef INET6 5369 struct sockaddr_in6 *dst6; 5370 struct route_in6 ro; 5371 #else 5372 struct route ro; 5373 #endif 5374 int ret = 0; 5375 5376 ASSERT_LWKT_TOKEN_HELD(&pf_token); 5377 5378 bzero(&ro, sizeof(ro)); 5379 switch (af) { 5380 case AF_INET: 5381 dst = satosin(&ro.ro_dst); 5382 dst->sin_family = AF_INET; 5383 dst->sin_len = sizeof(*dst); 5384 dst->sin_addr = addr->v4; 5385 break; 5386 #ifdef INET6 5387 case AF_INET6: 5388 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5389 dst6->sin6_family = AF_INET6; 5390 dst6->sin6_len = sizeof(*dst6); 5391 dst6->sin6_addr = addr->v6; 5392 break; 5393 #endif /* INET6 */ 5394 default: 5395 return (0); 5396 } 5397 5398 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING)); 5399 5400 if (ro.ro_rt != NULL) { 5401 RTFREE(ro.ro_rt); 5402 } 5403 5404 return (ret); 5405 } 5406 5407 #ifdef INET 5408 void 5409 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5410 struct pf_state *s, struct pf_pdesc *pd) 5411 { 5412 struct mbuf *m0, *m1; 5413 struct route iproute; 5414 struct route *ro = NULL; 5415 struct sockaddr_in *dst; 5416 struct ip *ip; 5417 struct ifnet *ifp = NULL; 5418 struct pf_addr naddr; 5419 struct pf_src_node *sn = NULL; 5420 int error = 0; 5421 int sw_csum; 5422 #ifdef IPSEC 5423 struct m_tag *mtag; 5424 #endif /* IPSEC */ 5425 5426 ASSERT_LWKT_TOKEN_HELD(&pf_token); 5427 5428 if (m == NULL || *m == NULL || r == NULL || 5429 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5430 panic("pf_route: invalid parameters"); 5431 5432 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5433 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5434 (*m)->m_pkthdr.pf.routed = 1; 5435 } else { 5436 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5437 m0 = *m; 5438 *m = NULL; 5439 goto bad; 5440 } 5441 } 5442 5443 if (r->rt == PF_DUPTO) { 5444 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) { 5445 return; 5446 } 5447 } else { 5448 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5449 return; 5450 } 5451 m0 = *m; 5452 } 5453 5454 if (m0->m_len < sizeof(struct ip)) { 5455 DPFPRINTF(PF_DEBUG_URGENT, 5456 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5457 goto bad; 5458 } 5459 5460 ip = mtod(m0, struct ip *); 5461 5462 ro = &iproute; 5463 bzero((caddr_t)ro, sizeof(*ro)); 5464 dst = satosin(&ro->ro_dst); 5465 dst->sin_family = AF_INET; 5466 dst->sin_len = sizeof(*dst); 5467 dst->sin_addr = ip->ip_dst; 5468 5469 if (r->rt == PF_FASTROUTE) { 5470 rtalloc(ro); 5471 if (ro->ro_rt == 0) { 5472 ipstat.ips_noroute++; 5473 goto bad; 5474 } 5475 5476 ifp = ro->ro_rt->rt_ifp; 5477 ro->ro_rt->rt_use++; 5478 5479 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 5480 dst = satosin(ro->ro_rt->rt_gateway); 5481 } else { 5482 if (TAILQ_EMPTY(&r->rpool.list)) { 5483 DPFPRINTF(PF_DEBUG_URGENT, 5484 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5485 goto bad; 5486 } 5487 if (s == NULL) { 5488 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5489 &naddr, NULL, &sn); 5490 if (!PF_AZERO(&naddr, AF_INET)) 5491 dst->sin_addr.s_addr = naddr.v4.s_addr; 5492 ifp = r->rpool.cur->kif ? 5493 r->rpool.cur->kif->pfik_ifp : NULL; 5494 } else { 5495 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5496 dst->sin_addr.s_addr = 5497 s->rt_addr.v4.s_addr; 5498 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5499 } 5500 } 5501 if (ifp == NULL) 5502 goto bad; 5503 5504 if (oifp != ifp) { 5505 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5506 goto bad; 5507 } else if (m0 == NULL) { 5508 goto done; 5509 } 5510 if (m0->m_len < sizeof(struct ip)) { 5511 DPFPRINTF(PF_DEBUG_URGENT, 5512 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5513 goto bad; 5514 } 5515 ip = mtod(m0, struct ip *); 5516 } 5517 5518 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 5519 m0->m_pkthdr.csum_flags |= CSUM_IP; 5520 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 5521 if (sw_csum & CSUM_DELAY_DATA) { 5522 in_delayed_cksum(m0); 5523 sw_csum &= ~CSUM_DELAY_DATA; 5524 } 5525 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 5526 m0->m_pkthdr.csum_iphlen = (ip->ip_hl << 2); 5527 5528 if (ip->ip_len <= ifp->if_mtu || 5529 (ifp->if_hwassist & CSUM_FRAGMENT && 5530 (ip->ip_off & IP_DF) == 0)) { 5531 ip->ip_len = htons(ip->ip_len); 5532 ip->ip_off = htons(ip->ip_off); 5533 ip->ip_sum = 0; 5534 if (sw_csum & CSUM_DELAY_IP) { 5535 /* From KAME */ 5536 if (ip->ip_v == IPVERSION && 5537 (ip->ip_hl << 2) == sizeof(*ip)) { 5538 ip->ip_sum = in_cksum_hdr(ip); 5539 } else { 5540 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5541 } 5542 } 5543 lwkt_reltoken(&pf_token); 5544 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt); 5545 lwkt_gettoken(&pf_token); 5546 goto done; 5547 } 5548 5549 /* 5550 * Too large for interface; fragment if possible. 5551 * Must be able to put at least 8 bytes per fragment. 5552 */ 5553 if (ip->ip_off & IP_DF) { 5554 ipstat.ips_cantfrag++; 5555 if (r->rt != PF_DUPTO) { 5556 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5557 ifp->if_mtu); 5558 goto done; 5559 } else 5560 goto bad; 5561 } 5562 5563 m1 = m0; 5564 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 5565 if (error) { 5566 goto bad; 5567 } 5568 5569 for (m0 = m1; m0; m0 = m1) { 5570 m1 = m0->m_nextpkt; 5571 m0->m_nextpkt = 0; 5572 if (error == 0) { 5573 lwkt_reltoken(&pf_token); 5574 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 5575 NULL); 5576 lwkt_gettoken(&pf_token); 5577 } else 5578 m_freem(m0); 5579 } 5580 5581 if (error == 0) 5582 ipstat.ips_fragmented++; 5583 5584 done: 5585 if (r->rt != PF_DUPTO) 5586 *m = NULL; 5587 if (ro == &iproute && ro->ro_rt) 5588 RTFREE(ro->ro_rt); 5589 return; 5590 5591 bad: 5592 m_freem(m0); 5593 goto done; 5594 } 5595 #endif /* INET */ 5596 5597 #ifdef INET6 5598 void 5599 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5600 struct pf_state *s, struct pf_pdesc *pd) 5601 { 5602 struct mbuf *m0; 5603 struct route_in6 ip6route; 5604 struct route_in6 *ro; 5605 struct sockaddr_in6 *dst; 5606 struct ip6_hdr *ip6; 5607 struct ifnet *ifp = NULL; 5608 struct pf_addr naddr; 5609 struct pf_src_node *sn = NULL; 5610 5611 if (m == NULL || *m == NULL || r == NULL || 5612 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5613 panic("pf_route6: invalid parameters"); 5614 5615 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) { 5616 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED; 5617 (*m)->m_pkthdr.pf.routed = 1; 5618 } else { 5619 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5620 m0 = *m; 5621 *m = NULL; 5622 goto bad; 5623 } 5624 } 5625 5626 if (r->rt == PF_DUPTO) { 5627 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) 5628 return; 5629 } else { 5630 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5631 return; 5632 m0 = *m; 5633 } 5634 5635 if (m0->m_len < sizeof(struct ip6_hdr)) { 5636 DPFPRINTF(PF_DEBUG_URGENT, 5637 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5638 goto bad; 5639 } 5640 ip6 = mtod(m0, struct ip6_hdr *); 5641 5642 ro = &ip6route; 5643 bzero((caddr_t)ro, sizeof(*ro)); 5644 dst = (struct sockaddr_in6 *)&ro->ro_dst; 5645 dst->sin6_family = AF_INET6; 5646 dst->sin6_len = sizeof(*dst); 5647 dst->sin6_addr = ip6->ip6_dst; 5648 5649 /* 5650 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 5651 * so make sure pf.flags is clear. 5652 * 5653 * Cheat. XXX why only in the v6 case??? 5654 */ 5655 if (r->rt == PF_FASTROUTE) { 5656 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED; 5657 m0->m_pkthdr.pf.flags = 0; 5658 /* XXX Re-Check when Upgrading to > 4.4 */ 5659 m0->m_pkthdr.pf.statekey = NULL; 5660 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5661 return; 5662 } 5663 5664 if (TAILQ_EMPTY(&r->rpool.list)) { 5665 DPFPRINTF(PF_DEBUG_URGENT, 5666 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 5667 goto bad; 5668 } 5669 if (s == NULL) { 5670 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5671 &naddr, NULL, &sn); 5672 if (!PF_AZERO(&naddr, AF_INET6)) 5673 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5674 &naddr, AF_INET6); 5675 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5676 } else { 5677 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5678 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 5679 &s->rt_addr, AF_INET6); 5680 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5681 } 5682 if (ifp == NULL) 5683 goto bad; 5684 5685 if (oifp != ifp) { 5686 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5687 goto bad; 5688 } else if (m0 == NULL) { 5689 goto done; 5690 } 5691 if (m0->m_len < sizeof(struct ip6_hdr)) { 5692 DPFPRINTF(PF_DEBUG_URGENT, 5693 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 5694 goto bad; 5695 } 5696 ip6 = mtod(m0, struct ip6_hdr *); 5697 } 5698 5699 /* 5700 * If the packet is too large for the outgoing interface, 5701 * send back an icmp6 error. 5702 */ 5703 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr)) 5704 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5705 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 5706 nd6_output(ifp, ifp, m0, dst, NULL); 5707 } else { 5708 in6_ifstat_inc(ifp, ifs6_in_toobig); 5709 if (r->rt != PF_DUPTO) 5710 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5711 else 5712 goto bad; 5713 } 5714 5715 done: 5716 if (r->rt != PF_DUPTO) 5717 *m = NULL; 5718 return; 5719 5720 bad: 5721 m_freem(m0); 5722 goto done; 5723 } 5724 #endif /* INET6 */ 5725 5726 5727 /* 5728 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 5729 * off is the offset where the protocol header starts 5730 * len is the total length of protocol header plus payload 5731 * returns 0 when the checksum is valid, otherwise returns 1. 5732 */ 5733 /* 5734 * XXX 5735 * FreeBSD supports cksum offload for the following drivers. 5736 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4) 5737 * If we can make full use of it we would outperform ipfw/ipfilter in 5738 * very heavy traffic. 5739 * I have not tested 'cause I don't have NICs that supports cksum offload. 5740 * (There might be problems. Typical phenomena would be 5741 * 1. No route message for UDP packet. 5742 * 2. No connection acceptance from external hosts regardless of rule set.) 5743 */ 5744 int 5745 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 5746 sa_family_t af) 5747 { 5748 u_int16_t sum = 0; 5749 int hw_assist = 0; 5750 struct ip *ip; 5751 5752 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5753 return (1); 5754 if (m->m_pkthdr.len < off + len) 5755 return (1); 5756 5757 switch (p) { 5758 case IPPROTO_TCP: 5759 case IPPROTO_UDP: 5760 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5761 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5762 sum = m->m_pkthdr.csum_data; 5763 } else { 5764 ip = mtod(m, struct ip *); 5765 sum = in_pseudo(ip->ip_src.s_addr, 5766 ip->ip_dst.s_addr, htonl((u_short)len + 5767 m->m_pkthdr.csum_data + p)); 5768 } 5769 sum ^= 0xffff; 5770 ++hw_assist; 5771 } 5772 break; 5773 case IPPROTO_ICMP: 5774 #ifdef INET6 5775 case IPPROTO_ICMPV6: 5776 #endif /* INET6 */ 5777 break; 5778 default: 5779 return (1); 5780 } 5781 5782 if (!hw_assist) { 5783 switch (af) { 5784 case AF_INET: 5785 if (p == IPPROTO_ICMP) { 5786 if (m->m_len < off) 5787 return (1); 5788 m->m_data += off; 5789 m->m_len -= off; 5790 sum = in_cksum(m, len); 5791 m->m_data -= off; 5792 m->m_len += off; 5793 } else { 5794 if (m->m_len < sizeof(struct ip)) 5795 return (1); 5796 sum = in_cksum_range(m, p, off, len); 5797 if (sum == 0) { 5798 m->m_pkthdr.csum_flags |= 5799 (CSUM_DATA_VALID | 5800 CSUM_PSEUDO_HDR); 5801 m->m_pkthdr.csum_data = 0xffff; 5802 } 5803 } 5804 break; 5805 #ifdef INET6 5806 case AF_INET6: 5807 if (m->m_len < sizeof(struct ip6_hdr)) 5808 return (1); 5809 sum = in6_cksum(m, p, off, len); 5810 /* 5811 * XXX 5812 * IPv6 H/W cksum off-load not supported yet! 5813 * 5814 * if (sum == 0) { 5815 * m->m_pkthdr.csum_flags |= 5816 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 5817 * m->m_pkthdr.csum_data = 0xffff; 5818 *} 5819 */ 5820 break; 5821 #endif /* INET6 */ 5822 default: 5823 return (1); 5824 } 5825 } 5826 if (sum) { 5827 switch (p) { 5828 case IPPROTO_TCP: 5829 tcpstat.tcps_rcvbadsum++; 5830 break; 5831 case IPPROTO_UDP: 5832 udp_stat.udps_badsum++; 5833 break; 5834 case IPPROTO_ICMP: 5835 icmpstat.icps_checksum++; 5836 break; 5837 #ifdef INET6 5838 case IPPROTO_ICMPV6: 5839 icmp6stat.icp6s_checksum++; 5840 break; 5841 #endif /* INET6 */ 5842 } 5843 return (1); 5844 } 5845 return (0); 5846 } 5847 5848 struct pf_divert * 5849 pf_find_divert(struct mbuf *m) 5850 { 5851 struct m_tag *mtag; 5852 5853 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) 5854 return (NULL); 5855 5856 return ((struct pf_divert *)(mtag + 1)); 5857 } 5858 5859 struct pf_divert * 5860 pf_get_divert(struct mbuf *m) 5861 { 5862 struct m_tag *mtag; 5863 5864 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) { 5865 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert), 5866 M_NOWAIT); 5867 if (mtag == NULL) 5868 return (NULL); 5869 bzero(mtag + 1, sizeof(struct pf_divert)); 5870 m_tag_prepend(m, mtag); 5871 } 5872 5873 return ((struct pf_divert *)(mtag + 1)); 5874 } 5875 5876 #ifdef INET 5877 int 5878 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 5879 struct ether_header *eh, struct inpcb *inp) 5880 { 5881 struct pfi_kif *kif; 5882 u_short action, reason = 0, log = 0; 5883 struct mbuf *m = *m0; 5884 struct ip *h = NULL; 5885 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 5886 struct pf_state *s = NULL; 5887 struct pf_ruleset *ruleset = NULL; 5888 struct pf_pdesc pd; 5889 int off, dirndx; 5890 #ifdef ALTQ 5891 int pqid = 0; 5892 #endif 5893 5894 if (!pf_status.running) 5895 return (PF_PASS); 5896 5897 memset(&pd, 0, sizeof(pd)); 5898 #ifdef foo 5899 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 5900 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 5901 else 5902 #endif 5903 kif = (struct pfi_kif *)ifp->if_pf_kif; 5904 5905 if (kif == NULL) { 5906 DPFPRINTF(PF_DEBUG_URGENT, 5907 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5908 return (PF_DROP); 5909 } 5910 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5911 return (PF_PASS); 5912 5913 #ifdef DIAGNOSTIC 5914 if ((m->m_flags & M_PKTHDR) == 0) 5915 panic("non-M_PKTHDR is passed to pf_test"); 5916 #endif /* DIAGNOSTIC */ 5917 5918 if (m->m_pkthdr.len < (int)sizeof(*h)) { 5919 action = PF_DROP; 5920 REASON_SET(&reason, PFRES_SHORT); 5921 log = 1; 5922 goto done; 5923 } 5924 5925 /* 5926 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 5927 * so make sure pf.flags is clear. 5928 */ 5929 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 5930 return (PF_PASS); 5931 m->m_pkthdr.pf.flags = 0; 5932 /* Re-Check when updating to > 4.4 */ 5933 m->m_pkthdr.pf.statekey = NULL; 5934 5935 /* We do IP header normalization and packet reassembly here */ 5936 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5937 action = PF_DROP; 5938 goto done; 5939 } 5940 m = *m0; /* pf_normalize messes with m0 */ 5941 h = mtod(m, struct ip *); 5942 5943 off = h->ip_hl << 2; 5944 if (off < (int)sizeof(*h)) { 5945 action = PF_DROP; 5946 REASON_SET(&reason, PFRES_SHORT); 5947 log = 1; 5948 goto done; 5949 } 5950 5951 pd.src = (struct pf_addr *)&h->ip_src; 5952 pd.dst = (struct pf_addr *)&h->ip_dst; 5953 pd.sport = pd.dport = NULL; 5954 pd.ip_sum = &h->ip_sum; 5955 pd.proto_sum = NULL; 5956 pd.proto = h->ip_p; 5957 pd.dir = dir; 5958 pd.sidx = (dir == PF_IN) ? 0 : 1; 5959 pd.didx = (dir == PF_IN) ? 1 : 0; 5960 pd.af = AF_INET; 5961 pd.tos = h->ip_tos; 5962 pd.tot_len = h->ip_len; 5963 pd.eh = eh; 5964 5965 /* handle fragments that didn't get reassembled by normalization */ 5966 if (h->ip_off & (IP_MF | IP_OFFMASK)) { 5967 action = pf_test_fragment(&r, dir, kif, m, h, 5968 &pd, &a, &ruleset); 5969 goto done; 5970 } 5971 5972 switch (h->ip_p) { 5973 5974 case IPPROTO_TCP: { 5975 struct tcphdr th; 5976 5977 pd.hdr.tcp = &th; 5978 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5979 &action, &reason, AF_INET)) { 5980 log = action != PF_PASS; 5981 goto done; 5982 } 5983 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5984 #ifdef ALTQ 5985 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5986 pqid = 1; 5987 #endif 5988 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5989 if (action == PF_DROP) 5990 goto done; 5991 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5992 &reason); 5993 if (action == PF_PASS) { 5994 pfsync_update_state(s); 5995 r = s->rule.ptr; 5996 a = s->anchor.ptr; 5997 log = s->log; 5998 } else if (s == NULL) 5999 action = pf_test_rule(&r, &s, dir, kif, 6000 m, off, h, &pd, &a, &ruleset, NULL, inp); 6001 break; 6002 } 6003 6004 case IPPROTO_UDP: { 6005 struct udphdr uh; 6006 6007 pd.hdr.udp = &uh; 6008 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6009 &action, &reason, AF_INET)) { 6010 log = action != PF_PASS; 6011 goto done; 6012 } 6013 if (uh.uh_dport == 0 || 6014 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6015 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6016 action = PF_DROP; 6017 REASON_SET(&reason, PFRES_SHORT); 6018 goto done; 6019 } 6020 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6021 if (action == PF_PASS) { 6022 pfsync_update_state(s); 6023 r = s->rule.ptr; 6024 a = s->anchor.ptr; 6025 log = s->log; 6026 } else if (s == NULL) 6027 action = pf_test_rule(&r, &s, dir, kif, 6028 m, off, h, &pd, &a, &ruleset, NULL, inp); 6029 break; 6030 } 6031 6032 case IPPROTO_ICMP: { 6033 struct icmp ih; 6034 6035 pd.hdr.icmp = &ih; 6036 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6037 &action, &reason, AF_INET)) { 6038 log = action != PF_PASS; 6039 goto done; 6040 } 6041 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6042 &reason); 6043 if (action == PF_PASS) { 6044 pfsync_update_state(s); 6045 r = s->rule.ptr; 6046 a = s->anchor.ptr; 6047 log = s->log; 6048 } else if (s == NULL) 6049 action = pf_test_rule(&r, &s, dir, kif, 6050 m, off, h, &pd, &a, &ruleset, NULL, inp); 6051 break; 6052 } 6053 6054 default: 6055 action = pf_test_state_other(&s, dir, kif, m, &pd); 6056 if (action == PF_PASS) { 6057 pfsync_update_state(s); 6058 r = s->rule.ptr; 6059 a = s->anchor.ptr; 6060 log = s->log; 6061 } else if (s == NULL) 6062 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6063 &pd, &a, &ruleset, NULL, inp); 6064 break; 6065 } 6066 6067 done: 6068 if (action == PF_PASS && h->ip_hl > 5 && 6069 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6070 action = PF_DROP; 6071 REASON_SET(&reason, PFRES_IPOPTIONS); 6072 log = 1; 6073 DPFPRINTF(PF_DEBUG_MISC, 6074 ("pf: dropping packet with ip options\n")); 6075 } 6076 6077 if ((s && s->tag) || r->rtableid) 6078 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6079 6080 #if 0 6081 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 6082 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 6083 #endif 6084 6085 #ifdef ALTQ 6086 if (action == PF_PASS && r->qid) { 6087 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 6088 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6089 m->m_pkthdr.pf.qid = r->pqid; 6090 else 6091 m->m_pkthdr.pf.qid = r->qid; 6092 m->m_pkthdr.pf.ecn_af = AF_INET; 6093 m->m_pkthdr.pf.hdr = h; 6094 /* add connection hash for fairq */ 6095 if (s) { 6096 /* for fairq */ 6097 m->m_pkthdr.pf.state_hash = s->hash; 6098 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 6099 } 6100 } 6101 #endif /* ALTQ */ 6102 6103 /* 6104 * connections redirected to loopback should not match sockets 6105 * bound specifically to loopback due to security implications, 6106 * see tcp_input() and in_pcblookup_listen(). 6107 */ 6108 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6109 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6110 (s->nat_rule.ptr->action == PF_RDR || 6111 s->nat_rule.ptr->action == PF_BINAT) && 6112 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 6113 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6114 6115 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 6116 struct pf_divert *divert; 6117 6118 if ((divert = pf_get_divert(m))) { 6119 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 6120 divert->port = r->divert.port; 6121 divert->addr.ipv4 = r->divert.addr.v4; 6122 } 6123 } 6124 6125 if (log) { 6126 struct pf_rule *lr; 6127 6128 if (s != NULL && s->nat_rule.ptr != NULL && 6129 s->nat_rule.ptr->log & PF_LOG_ALL) 6130 lr = s->nat_rule.ptr; 6131 else 6132 lr = r; 6133 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 6134 &pd); 6135 } 6136 6137 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6138 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6139 6140 if (action == PF_PASS || r->action == PF_DROP) { 6141 dirndx = (dir == PF_OUT); 6142 r->packets[dirndx]++; 6143 r->bytes[dirndx] += pd.tot_len; 6144 if (a != NULL) { 6145 a->packets[dirndx]++; 6146 a->bytes[dirndx] += pd.tot_len; 6147 } 6148 if (s != NULL) { 6149 if (s->nat_rule.ptr != NULL) { 6150 s->nat_rule.ptr->packets[dirndx]++; 6151 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6152 } 6153 if (s->src_node != NULL) { 6154 s->src_node->packets[dirndx]++; 6155 s->src_node->bytes[dirndx] += pd.tot_len; 6156 } 6157 if (s->nat_src_node != NULL) { 6158 s->nat_src_node->packets[dirndx]++; 6159 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6160 } 6161 dirndx = (dir == s->direction) ? 0 : 1; 6162 s->packets[dirndx]++; 6163 s->bytes[dirndx] += pd.tot_len; 6164 } 6165 tr = r; 6166 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6167 if (nr != NULL && r == &pf_default_rule) 6168 tr = nr; 6169 if (tr->src.addr.type == PF_ADDR_TABLE) 6170 pfr_update_stats(tr->src.addr.p.tbl, 6171 (s == NULL) ? pd.src : 6172 &s->key[(s->direction == PF_IN)]-> 6173 addr[(s->direction == PF_OUT)], 6174 pd.af, pd.tot_len, dir == PF_OUT, 6175 r->action == PF_PASS, tr->src.neg); 6176 if (tr->dst.addr.type == PF_ADDR_TABLE) 6177 pfr_update_stats(tr->dst.addr.p.tbl, 6178 (s == NULL) ? pd.dst : 6179 &s->key[(s->direction == PF_IN)]-> 6180 addr[(s->direction == PF_IN)], 6181 pd.af, pd.tot_len, dir == PF_OUT, 6182 r->action == PF_PASS, tr->dst.neg); 6183 } 6184 6185 6186 if (action == PF_SYNPROXY_DROP) { 6187 m_freem(*m0); 6188 *m0 = NULL; 6189 action = PF_PASS; 6190 } else if (r->rt) 6191 /* pf_route can free the mbuf causing *m0 to become NULL */ 6192 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6193 6194 return (action); 6195 } 6196 #endif /* INET */ 6197 6198 #ifdef INET6 6199 int 6200 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 6201 struct ether_header *eh, struct inpcb *inp) 6202 { 6203 struct pfi_kif *kif; 6204 u_short action, reason = 0, log = 0; 6205 struct mbuf *m = *m0, *n = NULL; 6206 struct ip6_hdr *h = NULL; 6207 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6208 struct pf_state *s = NULL; 6209 struct pf_ruleset *ruleset = NULL; 6210 struct pf_pdesc pd; 6211 int off, terminal = 0, dirndx, rh_cnt = 0; 6212 6213 if (!pf_status.running) 6214 return (PF_PASS); 6215 6216 memset(&pd, 0, sizeof(pd)); 6217 #ifdef foo 6218 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6219 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6220 else 6221 #endif 6222 kif = (struct pfi_kif *)ifp->if_pf_kif; 6223 6224 if (kif == NULL) { 6225 DPFPRINTF(PF_DEBUG_URGENT, 6226 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6227 return (PF_DROP); 6228 } 6229 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6230 return (PF_PASS); 6231 6232 #ifdef DIAGNOSTIC 6233 if ((m->m_flags & M_PKTHDR) == 0) 6234 panic("non-M_PKTHDR is passed to pf_test6"); 6235 #endif /* DIAGNOSTIC */ 6236 6237 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6238 action = PF_DROP; 6239 REASON_SET(&reason, PFRES_SHORT); 6240 log = 1; 6241 goto done; 6242 } 6243 6244 /* 6245 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags, 6246 * so make sure pf.flags is clear. 6247 */ 6248 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED) 6249 return (PF_PASS); 6250 m->m_pkthdr.pf.flags = 0; 6251 /* Re-Check when updating to > 4.4 */ 6252 m->m_pkthdr.pf.statekey = NULL; 6253 6254 /* We do IP header normalization and packet reassembly here */ 6255 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6256 action = PF_DROP; 6257 goto done; 6258 } 6259 m = *m0; /* pf_normalize messes with m0 */ 6260 h = mtod(m, struct ip6_hdr *); 6261 6262 #if 1 6263 /* 6264 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6265 * will do something bad, so drop the packet for now. 6266 */ 6267 if (htons(h->ip6_plen) == 0) { 6268 action = PF_DROP; 6269 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6270 goto done; 6271 } 6272 #endif 6273 6274 pd.src = (struct pf_addr *)&h->ip6_src; 6275 pd.dst = (struct pf_addr *)&h->ip6_dst; 6276 pd.sport = pd.dport = NULL; 6277 pd.ip_sum = NULL; 6278 pd.proto_sum = NULL; 6279 pd.dir = dir; 6280 pd.sidx = (dir == PF_IN) ? 0 : 1; 6281 pd.didx = (dir == PF_IN) ? 1 : 0; 6282 pd.af = AF_INET6; 6283 pd.tos = 0; 6284 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6285 pd.eh = eh; 6286 6287 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6288 pd.proto = h->ip6_nxt; 6289 do { 6290 switch (pd.proto) { 6291 case IPPROTO_FRAGMENT: 6292 action = pf_test_fragment(&r, dir, kif, m, h, 6293 &pd, &a, &ruleset); 6294 if (action == PF_DROP) 6295 REASON_SET(&reason, PFRES_FRAG); 6296 goto done; 6297 case IPPROTO_ROUTING: { 6298 struct ip6_rthdr rthdr; 6299 6300 if (rh_cnt++) { 6301 DPFPRINTF(PF_DEBUG_MISC, 6302 ("pf: IPv6 more than one rthdr\n")); 6303 action = PF_DROP; 6304 REASON_SET(&reason, PFRES_IPOPTIONS); 6305 log = 1; 6306 goto done; 6307 } 6308 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6309 &reason, pd.af)) { 6310 DPFPRINTF(PF_DEBUG_MISC, 6311 ("pf: IPv6 short rthdr\n")); 6312 action = PF_DROP; 6313 REASON_SET(&reason, PFRES_SHORT); 6314 log = 1; 6315 goto done; 6316 } 6317 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6318 DPFPRINTF(PF_DEBUG_MISC, 6319 ("pf: IPv6 rthdr0\n")); 6320 action = PF_DROP; 6321 REASON_SET(&reason, PFRES_IPOPTIONS); 6322 log = 1; 6323 goto done; 6324 } 6325 /* FALLTHROUGH */ 6326 } 6327 case IPPROTO_AH: 6328 case IPPROTO_HOPOPTS: 6329 case IPPROTO_DSTOPTS: { 6330 /* get next header and header length */ 6331 struct ip6_ext opt6; 6332 6333 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6334 NULL, &reason, pd.af)) { 6335 DPFPRINTF(PF_DEBUG_MISC, 6336 ("pf: IPv6 short opt\n")); 6337 action = PF_DROP; 6338 log = 1; 6339 goto done; 6340 } 6341 if (pd.proto == IPPROTO_AH) 6342 off += (opt6.ip6e_len + 2) * 4; 6343 else 6344 off += (opt6.ip6e_len + 1) * 8; 6345 pd.proto = opt6.ip6e_nxt; 6346 /* goto the next header */ 6347 break; 6348 } 6349 default: 6350 terminal++; 6351 break; 6352 } 6353 } while (!terminal); 6354 6355 /* if there's no routing header, use unmodified mbuf for checksumming */ 6356 if (!n) 6357 n = m; 6358 6359 switch (pd.proto) { 6360 6361 case IPPROTO_TCP: { 6362 struct tcphdr th; 6363 6364 pd.hdr.tcp = &th; 6365 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6366 &action, &reason, AF_INET6)) { 6367 log = action != PF_PASS; 6368 goto done; 6369 } 6370 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6371 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6372 if (action == PF_DROP) 6373 goto done; 6374 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6375 &reason); 6376 if (action == PF_PASS) { 6377 pfsync_update_state(s); 6378 r = s->rule.ptr; 6379 a = s->anchor.ptr; 6380 log = s->log; 6381 } else if (s == NULL) 6382 action = pf_test_rule(&r, &s, dir, kif, 6383 m, off, h, &pd, &a, &ruleset, NULL, inp); 6384 break; 6385 } 6386 6387 case IPPROTO_UDP: { 6388 struct udphdr uh; 6389 6390 pd.hdr.udp = &uh; 6391 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6392 &action, &reason, AF_INET6)) { 6393 log = action != PF_PASS; 6394 goto done; 6395 } 6396 if (uh.uh_dport == 0 || 6397 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6398 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6399 action = PF_DROP; 6400 REASON_SET(&reason, PFRES_SHORT); 6401 goto done; 6402 } 6403 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6404 if (action == PF_PASS) { 6405 pfsync_update_state(s); 6406 r = s->rule.ptr; 6407 a = s->anchor.ptr; 6408 log = s->log; 6409 } else if (s == NULL) 6410 action = pf_test_rule(&r, &s, dir, kif, 6411 m, off, h, &pd, &a, &ruleset, NULL, inp); 6412 break; 6413 } 6414 6415 case IPPROTO_ICMPV6: { 6416 struct icmp6_hdr ih; 6417 6418 pd.hdr.icmp6 = &ih; 6419 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6420 &action, &reason, AF_INET6)) { 6421 log = action != PF_PASS; 6422 goto done; 6423 } 6424 action = pf_test_state_icmp(&s, dir, kif, 6425 m, off, h, &pd, &reason); 6426 if (action == PF_PASS) { 6427 pfsync_update_state(s); 6428 r = s->rule.ptr; 6429 a = s->anchor.ptr; 6430 log = s->log; 6431 } else if (s == NULL) 6432 action = pf_test_rule(&r, &s, dir, kif, 6433 m, off, h, &pd, &a, &ruleset, NULL, inp); 6434 break; 6435 } 6436 6437 default: 6438 action = pf_test_state_other(&s, dir, kif, m, &pd); 6439 if (action == PF_PASS) { 6440 pfsync_update_state(s); 6441 r = s->rule.ptr; 6442 a = s->anchor.ptr; 6443 log = s->log; 6444 } else if (s == NULL) 6445 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6446 &pd, &a, &ruleset, NULL, inp); 6447 break; 6448 } 6449 6450 done: 6451 if (n != m) { 6452 m_freem(n); 6453 n = NULL; 6454 } 6455 6456 /* handle dangerous IPv6 extension headers. */ 6457 if (action == PF_PASS && rh_cnt && 6458 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6459 action = PF_DROP; 6460 REASON_SET(&reason, PFRES_IPOPTIONS); 6461 log = 1; 6462 DPFPRINTF(PF_DEBUG_MISC, 6463 ("pf: dropping packet with dangerous v6 headers\n")); 6464 } 6465 6466 if ((s && s->tag) || r->rtableid) 6467 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6468 6469 #if 0 6470 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 6471 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 6472 #endif 6473 6474 #ifdef ALTQ 6475 if (action == PF_PASS && r->qid) { 6476 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE; 6477 if (pd.tos & IPTOS_LOWDELAY) 6478 m->m_pkthdr.pf.qid = r->pqid; 6479 else 6480 m->m_pkthdr.pf.qid = r->qid; 6481 m->m_pkthdr.pf.ecn_af = AF_INET6; 6482 m->m_pkthdr.pf.hdr = h; 6483 if (s) { 6484 /* for fairq */ 6485 m->m_pkthdr.pf.state_hash = s->hash; 6486 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED; 6487 } 6488 } 6489 #endif /* ALTQ */ 6490 6491 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6492 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6493 (s->nat_rule.ptr->action == PF_RDR || 6494 s->nat_rule.ptr->action == PF_BINAT) && 6495 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6496 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6497 6498 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 6499 struct pf_divert *divert; 6500 6501 if ((divert = pf_get_divert(m))) { 6502 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 6503 divert->port = r->divert.port; 6504 divert->addr.ipv6 = r->divert.addr.v6; 6505 } 6506 } 6507 6508 if (log) { 6509 struct pf_rule *lr; 6510 6511 if (s != NULL && s->nat_rule.ptr != NULL && 6512 s->nat_rule.ptr->log & PF_LOG_ALL) 6513 lr = s->nat_rule.ptr; 6514 else 6515 lr = r; 6516 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 6517 &pd); 6518 } 6519 6520 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6521 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6522 6523 if (action == PF_PASS || r->action == PF_DROP) { 6524 dirndx = (dir == PF_OUT); 6525 r->packets[dirndx]++; 6526 r->bytes[dirndx] += pd.tot_len; 6527 if (a != NULL) { 6528 a->packets[dirndx]++; 6529 a->bytes[dirndx] += pd.tot_len; 6530 } 6531 if (s != NULL) { 6532 if (s->nat_rule.ptr != NULL) { 6533 s->nat_rule.ptr->packets[dirndx]++; 6534 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6535 } 6536 if (s->src_node != NULL) { 6537 s->src_node->packets[dirndx]++; 6538 s->src_node->bytes[dirndx] += pd.tot_len; 6539 } 6540 if (s->nat_src_node != NULL) { 6541 s->nat_src_node->packets[dirndx]++; 6542 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6543 } 6544 dirndx = (dir == s->direction) ? 0 : 1; 6545 s->packets[dirndx]++; 6546 s->bytes[dirndx] += pd.tot_len; 6547 } 6548 tr = r; 6549 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6550 if (nr != NULL && r == &pf_default_rule) 6551 tr = nr; 6552 if (tr->src.addr.type == PF_ADDR_TABLE) 6553 pfr_update_stats(tr->src.addr.p.tbl, 6554 (s == NULL) ? pd.src : 6555 &s->key[(s->direction == PF_IN)]->addr[0], 6556 pd.af, pd.tot_len, dir == PF_OUT, 6557 r->action == PF_PASS, tr->src.neg); 6558 if (tr->dst.addr.type == PF_ADDR_TABLE) 6559 pfr_update_stats(tr->dst.addr.p.tbl, 6560 (s == NULL) ? pd.dst : 6561 &s->key[(s->direction == PF_IN)]->addr[1], 6562 pd.af, pd.tot_len, dir == PF_OUT, 6563 r->action == PF_PASS, tr->dst.neg); 6564 } 6565 6566 6567 if (action == PF_SYNPROXY_DROP) { 6568 m_freem(*m0); 6569 *m0 = NULL; 6570 action = PF_PASS; 6571 } else if (r->rt) 6572 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 6573 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6574 6575 return (action); 6576 } 6577 #endif /* INET6 */ 6578 6579 int 6580 pf_check_congestion(struct ifqueue *ifq) 6581 { 6582 return (0); 6583 } 6584