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