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