pf.c revision 236671
1/* $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ */ 2 3/* 4 * Copyright (c) 2001 Daniel Hartmeier 5 * Copyright (c) 2002 - 2008 Henning Brauer 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * - Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * - Redistributions in binary form must reproduce the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer in the documentation and/or other materials provided 17 * with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 27 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 29 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 * 32 * Effort sponsored in part by the Defense Advanced Research Projects 33 * Agency (DARPA) and Air Force Research Laboratory, Air Force 34 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 35 * 36 */ 37 38#ifdef __FreeBSD__ 39#include "opt_inet.h" 40#include "opt_inet6.h" 41 42#include <sys/cdefs.h> 43__FBSDID("$FreeBSD: head/sys/contrib/pf/net/pf.c 236671 2012-06-06 09:36:52Z glebius $"); 44#endif 45 46#ifdef __FreeBSD__ 47#include "opt_bpf.h" 48#include "opt_pf.h" 49 50#define NPFSYNC 1 51 52#ifdef DEV_PFLOW 53#define NPFLOW DEV_PFLOW 54#else 55#define NPFLOW 0 56#endif 57 58#else 59#include "bpfilter.h" 60#include "pflog.h" 61#include "pfsync.h" 62#include "pflow.h" 63#endif 64 65#include <sys/param.h> 66#include <sys/systm.h> 67#include <sys/mbuf.h> 68#include <sys/filio.h> 69#include <sys/socket.h> 70#include <sys/socketvar.h> 71#include <sys/kernel.h> 72#include <sys/time.h> 73#ifdef __FreeBSD__ 74#include <sys/random.h> 75#include <sys/sysctl.h> 76#include <sys/endian.h> 77#define betoh64 be64toh 78#else 79#include <sys/pool.h> 80#endif 81#include <sys/proc.h> 82#ifdef __FreeBSD__ 83#include <sys/kthread.h> 84#include <sys/lock.h> 85#include <sys/sx.h> 86#else 87#include <sys/rwlock.h> 88#endif 89 90#ifdef __FreeBSD__ 91#include <sys/md5.h> 92#else 93#include <crypto/md5.h> 94#endif 95 96#include <net/if.h> 97#include <net/if_types.h> 98#include <net/bpf.h> 99#include <net/route.h> 100#ifdef __FreeBSD__ 101#ifdef RADIX_MPATH 102#include <net/radix_mpath.h> 103#endif 104#else 105#include <net/radix_mpath.h> 106#endif 107 108#include <netinet/in.h> 109#include <netinet/in_var.h> 110#include <netinet/in_systm.h> 111#include <netinet/ip.h> 112#include <netinet/ip_var.h> 113#include <netinet/tcp.h> 114#include <netinet/tcp_seq.h> 115#include <netinet/udp.h> 116#include <netinet/ip_icmp.h> 117#include <netinet/in_pcb.h> 118#include <netinet/tcp_timer.h> 119#include <netinet/tcp_var.h> 120#include <netinet/udp_var.h> 121#include <netinet/icmp_var.h> 122#include <netinet/if_ether.h> 123#ifdef __FreeBSD__ 124#include <netinet/ip_fw.h> 125#include <netinet/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */ 126#endif 127 128#ifndef __FreeBSD__ 129#include <dev/rndvar.h> 130#endif 131#include <net/pfvar.h> 132#include <net/if_pflog.h> 133#include <net/if_pflow.h> 134#include <net/if_pfsync.h> 135 136#ifdef INET6 137#include <netinet/ip6.h> 138#include <netinet/in_pcb.h> 139#include <netinet/icmp6.h> 140#include <netinet6/nd6.h> 141#ifdef __FreeBSD__ 142#include <netinet6/ip6_var.h> 143#include <netinet6/in6_pcb.h> 144#endif 145#endif /* INET6 */ 146 147#ifdef __FreeBSD__ 148#include <machine/in_cksum.h> 149#include <sys/limits.h> 150#include <sys/ucred.h> 151#include <security/mac/mac_framework.h> 152 153extern int ip_optcopy(struct ip *, struct ip *); 154#endif 155 156#ifdef __FreeBSD__ 157#define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 158#else 159#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x 160#endif 161 162/* 163 * Global variables 164 */ 165 166/* state tables */ 167#ifdef __FreeBSD__ 168VNET_DEFINE(struct pf_state_tree, pf_statetbl); 169 170VNET_DEFINE(struct pf_altqqueue, pf_altqs[2]); 171VNET_DEFINE(struct pf_palist, pf_pabuf); 172VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 173VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 174VNET_DEFINE(struct pf_status, pf_status); 175 176VNET_DEFINE(u_int32_t, ticket_altqs_active); 177VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 178VNET_DEFINE(int, altqs_inactive_open); 179VNET_DEFINE(u_int32_t, ticket_pabuf); 180 181VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 182#define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 183VNET_DEFINE(u_char, pf_tcp_secret[16]); 184#define V_pf_tcp_secret VNET(pf_tcp_secret) 185VNET_DEFINE(int, pf_tcp_secret_init); 186#define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 187VNET_DEFINE(int, pf_tcp_iss_off); 188#define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 189 190struct pf_anchor_stackframe { 191 struct pf_ruleset *rs; 192 struct pf_rule *r; 193 struct pf_anchor_node *parent; 194 struct pf_anchor *child; 195}; 196VNET_DEFINE(struct pf_anchor_stackframe, pf_anchor_stack[64]); 197#define V_pf_anchor_stack VNET(pf_anchor_stack) 198 199VNET_DEFINE(uma_zone_t, pf_src_tree_pl); 200VNET_DEFINE(uma_zone_t, pf_rule_pl); 201VNET_DEFINE(uma_zone_t, pf_pooladdr_pl); 202VNET_DEFINE(uma_zone_t, pf_state_pl); 203VNET_DEFINE(uma_zone_t, pf_state_key_pl); 204VNET_DEFINE(uma_zone_t, pf_state_item_pl); 205VNET_DEFINE(uma_zone_t, pf_altq_pl); 206#else 207struct pf_state_tree pf_statetbl; 208 209struct pf_altqqueue pf_altqs[2]; 210struct pf_palist pf_pabuf; 211struct pf_altqqueue *pf_altqs_active; 212struct pf_altqqueue *pf_altqs_inactive; 213struct pf_status pf_status; 214 215u_int32_t ticket_altqs_active; 216u_int32_t ticket_altqs_inactive; 217int altqs_inactive_open; 218u_int32_t ticket_pabuf; 219 220MD5_CTX pf_tcp_secret_ctx; 221u_char pf_tcp_secret[16]; 222int pf_tcp_secret_init; 223int pf_tcp_iss_off; 224 225struct pf_anchor_stackframe { 226 struct pf_ruleset *rs; 227 struct pf_rule *r; 228 struct pf_anchor_node *parent; 229 struct pf_anchor *child; 230} pf_anchor_stack[64]; 231 232struct pool pf_src_tree_pl, pf_rule_pl, pf_pooladdr_pl; 233struct pool pf_state_pl, pf_state_key_pl, pf_state_item_pl; 234struct pool pf_altq_pl; 235#endif 236 237void pf_init_threshold(struct pf_threshold *, u_int32_t, 238 u_int32_t); 239void pf_add_threshold(struct pf_threshold *); 240int pf_check_threshold(struct pf_threshold *); 241 242void pf_change_ap(struct pf_addr *, u_int16_t *, 243 u_int16_t *, u_int16_t *, struct pf_addr *, 244 u_int16_t, u_int8_t, sa_family_t); 245int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 246 struct tcphdr *, struct pf_state_peer *); 247#ifdef INET6 248void pf_change_a6(struct pf_addr *, u_int16_t *, 249 struct pf_addr *, u_int8_t); 250#endif /* INET6 */ 251void pf_change_icmp(struct pf_addr *, u_int16_t *, 252 struct pf_addr *, struct pf_addr *, u_int16_t, 253 u_int16_t *, u_int16_t *, u_int16_t *, 254 u_int16_t *, u_int8_t, sa_family_t); 255#ifdef __FreeBSD__ 256void pf_send_tcp(struct mbuf *, 257 const struct pf_rule *, sa_family_t, 258#else 259void pf_send_tcp(const struct pf_rule *, sa_family_t, 260#endif 261 const struct pf_addr *, const struct pf_addr *, 262 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 263 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 264 u_int16_t, struct ether_header *, struct ifnet *); 265static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 266 sa_family_t, struct pf_rule *); 267void pf_detach_state(struct pf_state *); 268void pf_state_key_detach(struct pf_state *, int); 269u_int32_t pf_tcp_iss(struct pf_pdesc *); 270int pf_test_rule(struct pf_rule **, struct pf_state **, 271 int, struct pfi_kif *, struct mbuf *, int, 272 void *, struct pf_pdesc *, struct pf_rule **, 273#ifdef __FreeBSD__ 274 struct pf_ruleset **, struct ifqueue *, 275 struct inpcb *); 276#else 277 struct pf_ruleset **, struct ifqueue *); 278#endif 279static __inline int pf_create_state(struct pf_rule *, struct pf_rule *, 280 struct pf_rule *, struct pf_pdesc *, 281 struct pf_src_node *, struct pf_state_key *, 282 struct pf_state_key *, struct pf_state_key *, 283 struct pf_state_key *, struct mbuf *, int, 284 u_int16_t, u_int16_t, int *, struct pfi_kif *, 285 struct pf_state **, int, u_int16_t, u_int16_t, 286 int); 287int pf_test_fragment(struct pf_rule **, int, 288 struct pfi_kif *, struct mbuf *, void *, 289 struct pf_pdesc *, struct pf_rule **, 290 struct pf_ruleset **); 291int pf_tcp_track_full(struct pf_state_peer *, 292 struct pf_state_peer *, struct pf_state **, 293 struct pfi_kif *, struct mbuf *, int, 294 struct pf_pdesc *, u_short *, int *); 295int pf_tcp_track_sloppy(struct pf_state_peer *, 296 struct pf_state_peer *, struct pf_state **, 297 struct pf_pdesc *, u_short *); 298int pf_test_state_tcp(struct pf_state **, int, 299 struct pfi_kif *, struct mbuf *, int, 300 void *, struct pf_pdesc *, u_short *); 301int pf_test_state_udp(struct pf_state **, int, 302 struct pfi_kif *, struct mbuf *, int, 303 void *, struct pf_pdesc *); 304int pf_test_state_icmp(struct pf_state **, int, 305 struct pfi_kif *, struct mbuf *, int, 306 void *, struct pf_pdesc *, u_short *); 307int pf_test_state_other(struct pf_state **, int, 308 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 309void pf_route(struct mbuf **, struct pf_rule *, int, 310 struct ifnet *, struct pf_state *, 311 struct pf_pdesc *); 312void pf_route6(struct mbuf **, struct pf_rule *, int, 313 struct ifnet *, struct pf_state *, 314 struct pf_pdesc *); 315#ifndef __FreeBSD__ 316int pf_socket_lookup(int, struct pf_pdesc *); 317#endif 318u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 319 sa_family_t); 320u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 321 sa_family_t); 322u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 323 int, u_int16_t); 324void pf_set_rt_ifp(struct pf_state *, 325 struct pf_addr *); 326int pf_check_proto_cksum(struct mbuf *, int, int, 327 u_int8_t, sa_family_t); 328#ifndef __FreeBSD__ 329struct pf_divert *pf_get_divert(struct mbuf *); 330#endif 331void pf_print_state_parts(struct pf_state *, 332 struct pf_state_key *, struct pf_state_key *); 333int pf_addr_wrap_neq(struct pf_addr_wrap *, 334 struct pf_addr_wrap *); 335int pf_compare_state_keys(struct pf_state_key *, 336 struct pf_state_key *, struct pfi_kif *, u_int); 337#ifdef __FreeBSD__ 338struct pf_state *pf_find_state(struct pfi_kif *, 339 struct pf_state_key_cmp *, u_int, struct mbuf *, 340 struct pf_mtag *); 341#else 342struct pf_state *pf_find_state(struct pfi_kif *, 343 struct pf_state_key_cmp *, u_int, struct mbuf *); 344#endif 345int pf_src_connlimit(struct pf_state **); 346int pf_check_congestion(struct ifqueue *); 347 348#ifdef __FreeBSD__ 349int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 350 351VNET_DECLARE(int, pf_end_threads); 352 353VNET_DEFINE(struct pf_pool_limit, pf_pool_limits[PF_LIMIT_MAX]); 354#else 355extern struct pool pfr_ktable_pl; 356extern struct pool pfr_kentry_pl; 357 358struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 359 { &pf_state_pl, PFSTATE_HIWAT }, 360 { &pf_src_tree_pl, PFSNODE_HIWAT }, 361 { &pf_frent_pl, PFFRAG_FRENT_HIWAT }, 362 { &pfr_ktable_pl, PFR_KTABLE_HIWAT }, 363 { &pfr_kentry_pl, PFR_KENTRY_HIWAT } 364}; 365#endif 366 367#ifdef __FreeBSD__ 368#define PPACKET_LOOPED() \ 369 (pd->pf_mtag->flags & PF_PACKET_LOOPED) 370 371#define PACKET_LOOPED() \ 372 (pd.pf_mtag->flags & PF_PACKET_LOOPED) 373 374#define STATE_LOOKUP(i, k, d, s, m, pt) \ 375 do { \ 376 s = pf_find_state(i, k, d, m, pt); \ 377 if (s == NULL || (s)->timeout == PFTM_PURGE) \ 378 return (PF_DROP); \ 379 if (PPACKET_LOOPED()) \ 380 return (PF_PASS); \ 381 if (d == PF_OUT && \ 382 (((s)->rule.ptr->rt == PF_ROUTETO && \ 383 (s)->rule.ptr->direction == PF_OUT) || \ 384 ((s)->rule.ptr->rt == PF_REPLYTO && \ 385 (s)->rule.ptr->direction == PF_IN)) && \ 386 (s)->rt_kif != NULL && \ 387 (s)->rt_kif != i) \ 388 return (PF_PASS); \ 389 } while (0) 390#else 391#define STATE_LOOKUP(i, k, d, s, m) \ 392 do { \ 393 s = pf_find_state(i, k, d, m); \ 394 if (s == NULL || (s)->timeout == PFTM_PURGE) \ 395 return (PF_DROP); \ 396 if (d == PF_OUT && \ 397 (((s)->rule.ptr->rt == PF_ROUTETO && \ 398 (s)->rule.ptr->direction == PF_OUT) || \ 399 ((s)->rule.ptr->rt == PF_REPLYTO && \ 400 (s)->rule.ptr->direction == PF_IN)) && \ 401 (s)->rt_kif != NULL && \ 402 (s)->rt_kif != i) \ 403 return (PF_PASS); \ 404 } while (0) 405#endif 406 407#ifdef __FreeBSD__ 408#define BOUND_IFACE(r, k) \ 409 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 410#else 411#define BOUND_IFACE(r, k) \ 412 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all 413#endif 414 415#define STATE_INC_COUNTERS(s) \ 416 do { \ 417 s->rule.ptr->states_cur++; \ 418 s->rule.ptr->states_tot++; \ 419 if (s->anchor.ptr != NULL) { \ 420 s->anchor.ptr->states_cur++; \ 421 s->anchor.ptr->states_tot++; \ 422 } \ 423 if (s->nat_rule.ptr != NULL) { \ 424 s->nat_rule.ptr->states_cur++; \ 425 s->nat_rule.ptr->states_tot++; \ 426 } \ 427 } while (0) 428 429#define STATE_DEC_COUNTERS(s) \ 430 do { \ 431 if (s->nat_rule.ptr != NULL) \ 432 s->nat_rule.ptr->states_cur--; \ 433 if (s->anchor.ptr != NULL) \ 434 s->anchor.ptr->states_cur--; \ 435 s->rule.ptr->states_cur--; \ 436 } while (0) 437 438static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 439static __inline int pf_state_compare_key(struct pf_state_key *, 440 struct pf_state_key *); 441static __inline int pf_state_compare_id(struct pf_state *, 442 struct pf_state *); 443 444#ifdef __FreeBSD__ 445VNET_DEFINE(struct pf_src_tree, tree_src_tracking); 446 447VNET_DEFINE(struct pf_state_tree_id, tree_id); 448VNET_DEFINE(struct pf_state_queue, state_list); 449#else 450struct pf_src_tree tree_src_tracking; 451 452struct pf_state_tree_id tree_id; 453struct pf_state_queue state_list; 454#endif 455 456RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 457RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key); 458RB_GENERATE(pf_state_tree_id, pf_state, 459 entry_id, pf_state_compare_id); 460 461static __inline int 462pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 463{ 464 int diff; 465 466 if (a->rule.ptr > b->rule.ptr) 467 return (1); 468 if (a->rule.ptr < b->rule.ptr) 469 return (-1); 470 if ((diff = a->af - b->af) != 0) 471 return (diff); 472 switch (a->af) { 473#ifdef INET 474 case AF_INET: 475 if (a->addr.addr32[0] > b->addr.addr32[0]) 476 return (1); 477 if (a->addr.addr32[0] < b->addr.addr32[0]) 478 return (-1); 479 break; 480#endif /* INET */ 481#ifdef INET6 482 case AF_INET6: 483 if (a->addr.addr32[3] > b->addr.addr32[3]) 484 return (1); 485 if (a->addr.addr32[3] < b->addr.addr32[3]) 486 return (-1); 487 if (a->addr.addr32[2] > b->addr.addr32[2]) 488 return (1); 489 if (a->addr.addr32[2] < b->addr.addr32[2]) 490 return (-1); 491 if (a->addr.addr32[1] > b->addr.addr32[1]) 492 return (1); 493 if (a->addr.addr32[1] < b->addr.addr32[1]) 494 return (-1); 495 if (a->addr.addr32[0] > b->addr.addr32[0]) 496 return (1); 497 if (a->addr.addr32[0] < b->addr.addr32[0]) 498 return (-1); 499 break; 500#endif /* INET6 */ 501 } 502 return (0); 503} 504 505#ifdef INET6 506void 507pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 508{ 509 switch (af) { 510#ifdef INET 511 case AF_INET: 512 dst->addr32[0] = src->addr32[0]; 513 break; 514#endif /* INET */ 515 case AF_INET6: 516 dst->addr32[0] = src->addr32[0]; 517 dst->addr32[1] = src->addr32[1]; 518 dst->addr32[2] = src->addr32[2]; 519 dst->addr32[3] = src->addr32[3]; 520 break; 521 } 522} 523#endif /* INET6 */ 524 525void 526pf_init_threshold(struct pf_threshold *threshold, 527 u_int32_t limit, u_int32_t seconds) 528{ 529 threshold->limit = limit * PF_THRESHOLD_MULT; 530 threshold->seconds = seconds; 531 threshold->count = 0; 532 threshold->last = time_second; 533} 534 535void 536pf_add_threshold(struct pf_threshold *threshold) 537{ 538 u_int32_t t = time_second, diff = t - threshold->last; 539 540 if (diff >= threshold->seconds) 541 threshold->count = 0; 542 else 543 threshold->count -= threshold->count * diff / 544 threshold->seconds; 545 threshold->count += PF_THRESHOLD_MULT; 546 threshold->last = t; 547} 548 549int 550pf_check_threshold(struct pf_threshold *threshold) 551{ 552 return (threshold->count > threshold->limit); 553} 554 555int 556pf_src_connlimit(struct pf_state **state) 557{ 558 int bad = 0; 559 560 (*state)->src_node->conn++; 561 (*state)->src.tcp_est = 1; 562 pf_add_threshold(&(*state)->src_node->conn_rate); 563 564 if ((*state)->rule.ptr->max_src_conn && 565 (*state)->rule.ptr->max_src_conn < 566 (*state)->src_node->conn) { 567#ifdef __FreeBSD__ 568 V_pf_status.lcounters[LCNT_SRCCONN]++; 569#else 570 pf_status.lcounters[LCNT_SRCCONN]++; 571#endif 572 bad++; 573 } 574 575 if ((*state)->rule.ptr->max_src_conn_rate.limit && 576 pf_check_threshold(&(*state)->src_node->conn_rate)) { 577#ifdef __FreeBSD__ 578 V_pf_status.lcounters[LCNT_SRCCONNRATE]++; 579#else 580 pf_status.lcounters[LCNT_SRCCONNRATE]++; 581#endif 582 bad++; 583 } 584 585 if (!bad) 586 return (0); 587 588 if ((*state)->rule.ptr->overload_tbl) { 589 struct pfr_addr p; 590 u_int32_t killed = 0; 591 592#ifdef __FreeBSD__ 593 V_pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 594 if (V_pf_status.debug >= PF_DEBUG_MISC) { 595#else 596 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 597 if (pf_status.debug >= PF_DEBUG_MISC) { 598#endif 599 printf("pf_src_connlimit: blocking address "); 600 pf_print_host(&(*state)->src_node->addr, 0, 601 (*state)->key[PF_SK_WIRE]->af); 602 } 603 604 bzero(&p, sizeof(p)); 605 p.pfra_af = (*state)->key[PF_SK_WIRE]->af; 606 switch ((*state)->key[PF_SK_WIRE]->af) { 607#ifdef INET 608 case AF_INET: 609 p.pfra_net = 32; 610 p.pfra_ip4addr = (*state)->src_node->addr.v4; 611 break; 612#endif /* INET */ 613#ifdef INET6 614 case AF_INET6: 615 p.pfra_net = 128; 616 p.pfra_ip6addr = (*state)->src_node->addr.v6; 617 break; 618#endif /* INET6 */ 619 } 620 621 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 622 &p, time_second); 623 624 /* kill existing states if that's required. */ 625 if ((*state)->rule.ptr->flush) { 626 struct pf_state_key *sk; 627 struct pf_state *st; 628 629#ifdef __FreeBSD__ 630 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 631 RB_FOREACH(st, pf_state_tree_id, &V_tree_id) { 632#else 633 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 634 RB_FOREACH(st, pf_state_tree_id, &tree_id) { 635#endif 636 sk = st->key[PF_SK_WIRE]; 637 /* 638 * Kill states from this source. (Only those 639 * from the same rule if PF_FLUSH_GLOBAL is not 640 * set) 641 */ 642 if (sk->af == 643 (*state)->key[PF_SK_WIRE]->af && 644 (((*state)->direction == PF_OUT && 645 PF_AEQ(&(*state)->src_node->addr, 646 &sk->addr[1], sk->af)) || 647 ((*state)->direction == PF_IN && 648 PF_AEQ(&(*state)->src_node->addr, 649 &sk->addr[0], sk->af))) && 650 ((*state)->rule.ptr->flush & 651 PF_FLUSH_GLOBAL || 652 (*state)->rule.ptr == st->rule.ptr)) { 653 st->timeout = PFTM_PURGE; 654 st->src.state = st->dst.state = 655 TCPS_CLOSED; 656 killed++; 657 } 658 } 659#ifdef __FreeBSD__ 660 if (V_pf_status.debug >= PF_DEBUG_MISC) 661#else 662 if (pf_status.debug >= PF_DEBUG_MISC) 663#endif 664 printf(", %u states killed", killed); 665 } 666#ifdef __FreeBSD__ 667 if (V_pf_status.debug >= PF_DEBUG_MISC) 668#else 669 if (pf_status.debug >= PF_DEBUG_MISC) 670#endif 671 printf("\n"); 672 } 673 674 /* kill this state */ 675 (*state)->timeout = PFTM_PURGE; 676 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 677 return (1); 678} 679 680int 681pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 682 struct pf_addr *src, sa_family_t af) 683{ 684 struct pf_src_node k; 685 686 if (*sn == NULL) { 687 k.af = af; 688 PF_ACPY(&k.addr, src, af); 689 if (rule->rule_flag & PFRULE_RULESRCTRACK || 690 rule->rpool.opts & PF_POOL_STICKYADDR) 691 k.rule.ptr = rule; 692 else 693 k.rule.ptr = NULL; 694#ifdef __FreeBSD__ 695 V_pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 696 *sn = RB_FIND(pf_src_tree, &V_tree_src_tracking, &k); 697#else 698 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 699 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 700#endif 701 } 702 if (*sn == NULL) { 703 if (!rule->max_src_nodes || 704 rule->src_nodes < rule->max_src_nodes) 705#ifdef __FreeBSD__ 706 (*sn) = pool_get(&V_pf_src_tree_pl, PR_NOWAIT | PR_ZERO); 707#else 708 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT | PR_ZERO); 709#endif 710 else 711#ifdef __FreeBSD__ 712 V_pf_status.lcounters[LCNT_SRCNODES]++; 713#else 714 pf_status.lcounters[LCNT_SRCNODES]++; 715#endif 716 if ((*sn) == NULL) 717 return (-1); 718 719 pf_init_threshold(&(*sn)->conn_rate, 720 rule->max_src_conn_rate.limit, 721 rule->max_src_conn_rate.seconds); 722 723 (*sn)->af = af; 724 if (rule->rule_flag & PFRULE_RULESRCTRACK || 725 rule->rpool.opts & PF_POOL_STICKYADDR) 726 (*sn)->rule.ptr = rule; 727 else 728 (*sn)->rule.ptr = NULL; 729 PF_ACPY(&(*sn)->addr, src, af); 730 if (RB_INSERT(pf_src_tree, 731#ifdef __FreeBSD__ 732 &V_tree_src_tracking, *sn) != NULL) { 733 if (V_pf_status.debug >= PF_DEBUG_MISC) { 734#else 735 &tree_src_tracking, *sn) != NULL) { 736 if (pf_status.debug >= PF_DEBUG_MISC) { 737#endif 738 printf("pf: src_tree insert failed: "); 739 pf_print_host(&(*sn)->addr, 0, af); 740 printf("\n"); 741 } 742#ifdef __FreeBSD__ 743 pool_put(&V_pf_src_tree_pl, *sn); 744#else 745 pool_put(&pf_src_tree_pl, *sn); 746#endif 747 return (-1); 748 } 749 (*sn)->creation = time_second; 750 (*sn)->ruletype = rule->action; 751 if ((*sn)->rule.ptr != NULL) 752 (*sn)->rule.ptr->src_nodes++; 753#ifdef __FreeBSD__ 754 V_pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 755 V_pf_status.src_nodes++; 756#else 757 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 758 pf_status.src_nodes++; 759#endif 760 } else { 761 if (rule->max_src_states && 762 (*sn)->states >= rule->max_src_states) { 763#ifdef __FreeBSD__ 764 V_pf_status.lcounters[LCNT_SRCSTATES]++; 765#else 766 pf_status.lcounters[LCNT_SRCSTATES]++; 767#endif 768 return (-1); 769 } 770 } 771 return (0); 772} 773 774/* state table stuff */ 775 776static __inline int 777pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b) 778{ 779 int diff; 780 781 if ((diff = a->proto - b->proto) != 0) 782 return (diff); 783 if ((diff = a->af - b->af) != 0) 784 return (diff); 785 switch (a->af) { 786#ifdef INET 787 case AF_INET: 788 if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 789 return (1); 790 if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 791 return (-1); 792 if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 793 return (1); 794 if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 795 return (-1); 796 break; 797#endif /* INET */ 798#ifdef INET6 799 case AF_INET6: 800 if (a->addr[0].addr32[3] > b->addr[0].addr32[3]) 801 return (1); 802 if (a->addr[0].addr32[3] < b->addr[0].addr32[3]) 803 return (-1); 804 if (a->addr[1].addr32[3] > b->addr[1].addr32[3]) 805 return (1); 806 if (a->addr[1].addr32[3] < b->addr[1].addr32[3]) 807 return (-1); 808 if (a->addr[0].addr32[2] > b->addr[0].addr32[2]) 809 return (1); 810 if (a->addr[0].addr32[2] < b->addr[0].addr32[2]) 811 return (-1); 812 if (a->addr[1].addr32[2] > b->addr[1].addr32[2]) 813 return (1); 814 if (a->addr[1].addr32[2] < b->addr[1].addr32[2]) 815 return (-1); 816 if (a->addr[0].addr32[1] > b->addr[0].addr32[1]) 817 return (1); 818 if (a->addr[0].addr32[1] < b->addr[0].addr32[1]) 819 return (-1); 820 if (a->addr[1].addr32[1] > b->addr[1].addr32[1]) 821 return (1); 822 if (a->addr[1].addr32[1] < b->addr[1].addr32[1]) 823 return (-1); 824 if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) 825 return (1); 826 if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) 827 return (-1); 828 if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) 829 return (1); 830 if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) 831 return (-1); 832 break; 833#endif /* INET6 */ 834 } 835 836 if ((diff = a->port[0] - b->port[0]) != 0) 837 return (diff); 838 if ((diff = a->port[1] - b->port[1]) != 0) 839 return (diff); 840 841 return (0); 842} 843 844static __inline int 845pf_state_compare_id(struct pf_state *a, struct pf_state *b) 846{ 847 if (a->id > b->id) 848 return (1); 849 if (a->id < b->id) 850 return (-1); 851 if (a->creatorid > b->creatorid) 852 return (1); 853 if (a->creatorid < b->creatorid) 854 return (-1); 855 856 return (0); 857} 858 859int 860pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx) 861{ 862 struct pf_state_item *si; 863 struct pf_state_key *cur; 864 struct pf_state *olds = NULL; 865 866#ifdef __FreeBSD__ 867 KASSERT(s->key[idx] == NULL, ("%s: key is null!", __FUNCTION__)); 868#else 869 KASSERT(s->key[idx] == NULL); /* XXX handle this? */ 870#endif 871 872#ifdef __FreeBSD__ 873 if ((cur = RB_INSERT(pf_state_tree, &V_pf_statetbl, sk)) != NULL) { 874#else 875 if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl, sk)) != NULL) { 876#endif 877 /* key exists. check for same kif, if none, add to key */ 878 TAILQ_FOREACH(si, &cur->states, entry) 879 if (si->s->kif == s->kif && 880 si->s->direction == s->direction) { 881 if (sk->proto == IPPROTO_TCP && 882 si->s->src.state >= TCPS_FIN_WAIT_2 && 883 si->s->dst.state >= TCPS_FIN_WAIT_2) { 884 si->s->src.state = si->s->dst.state = 885 TCPS_CLOSED; 886 /* unlink late or sks can go away */ 887 olds = si->s; 888 } else { 889#ifdef __FreeBSD__ 890 if (V_pf_status.debug >= PF_DEBUG_MISC) { 891#else 892 if (pf_status.debug >= PF_DEBUG_MISC) { 893#endif 894 printf("pf: %s key attach " 895 "failed on %s: ", 896 (idx == PF_SK_WIRE) ? 897 "wire" : "stack", 898 s->kif->pfik_name); 899 pf_print_state_parts(s, 900 (idx == PF_SK_WIRE) ? 901 sk : NULL, 902 (idx == PF_SK_STACK) ? 903 sk : NULL); 904 printf(", existing: "); 905 pf_print_state_parts(si->s, 906 (idx == PF_SK_WIRE) ? 907 sk : NULL, 908 (idx == PF_SK_STACK) ? 909 sk : NULL); 910 printf("\n"); 911 } 912#ifdef __FreeBSD__ 913 pool_put(&V_pf_state_key_pl, sk); 914#else 915 pool_put(&pf_state_key_pl, sk); 916#endif 917 return (-1); /* collision! */ 918 } 919 } 920#ifdef __FreeBSD__ 921 pool_put(&V_pf_state_key_pl, sk); 922#else 923 pool_put(&pf_state_key_pl, sk); 924#endif 925 s->key[idx] = cur; 926 } else 927 s->key[idx] = sk; 928 929#ifdef __FreeBSD__ 930 if ((si = pool_get(&V_pf_state_item_pl, PR_NOWAIT)) == NULL) { 931#else 932 if ((si = pool_get(&pf_state_item_pl, PR_NOWAIT)) == NULL) { 933#endif 934 pf_state_key_detach(s, idx); 935 return (-1); 936 } 937 si->s = s; 938 939 /* list is sorted, if-bound states before floating */ 940#ifdef __FreeBSD__ 941 if (s->kif == V_pfi_all) 942#else 943 if (s->kif == pfi_all) 944#endif 945 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry); 946 else 947 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry); 948 949 if (olds) 950 pf_unlink_state(olds); 951 952 return (0); 953} 954 955void 956pf_detach_state(struct pf_state *s) 957{ 958 if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK]) 959 s->key[PF_SK_WIRE] = NULL; 960 961 if (s->key[PF_SK_STACK] != NULL) 962 pf_state_key_detach(s, PF_SK_STACK); 963 964 if (s->key[PF_SK_WIRE] != NULL) 965 pf_state_key_detach(s, PF_SK_WIRE); 966} 967 968void 969pf_state_key_detach(struct pf_state *s, int idx) 970{ 971 struct pf_state_item *si; 972 973 si = TAILQ_FIRST(&s->key[idx]->states); 974 while (si && si->s != s) 975 si = TAILQ_NEXT(si, entry); 976 977 if (si) { 978 TAILQ_REMOVE(&s->key[idx]->states, si, entry); 979#ifdef __FreeBSD__ 980 pool_put(&V_pf_state_item_pl, si); 981#else 982 pool_put(&pf_state_item_pl, si); 983#endif 984 } 985 986 if (TAILQ_EMPTY(&s->key[idx]->states)) { 987#ifdef __FreeBSD__ 988 RB_REMOVE(pf_state_tree, &V_pf_statetbl, s->key[idx]); 989#else 990 RB_REMOVE(pf_state_tree, &pf_statetbl, s->key[idx]); 991#endif 992 if (s->key[idx]->reverse) 993 s->key[idx]->reverse->reverse = NULL; 994#ifdef __FreeBSD__ 995 /* XXX: implement this */ 996#else 997 if (s->key[idx]->inp) 998 s->key[idx]->inp->inp_pf_sk = NULL; 999#endif 1000#ifdef __FreeBSD__ 1001 pool_put(&V_pf_state_key_pl, s->key[idx]); 1002#else 1003 pool_put(&pf_state_key_pl, s->key[idx]); 1004#endif 1005 } 1006 s->key[idx] = NULL; 1007} 1008 1009struct pf_state_key * 1010pf_alloc_state_key(int pool_flags) 1011{ 1012 struct pf_state_key *sk; 1013 1014#ifdef __FreeBSD__ 1015 if ((sk = pool_get(&V_pf_state_key_pl, pool_flags)) == NULL) 1016#else 1017 if ((sk = pool_get(&pf_state_key_pl, pool_flags)) == NULL) 1018#endif 1019 return (NULL); 1020 TAILQ_INIT(&sk->states); 1021 1022 return (sk); 1023} 1024 1025int 1026pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr, 1027 struct pf_state_key **skw, struct pf_state_key **sks, 1028 struct pf_state_key **skp, struct pf_state_key **nkp, 1029 struct pf_addr *saddr, struct pf_addr *daddr, 1030 u_int16_t sport, u_int16_t dport) 1031{ 1032#ifdef __FreeBSD__ 1033 KASSERT((*skp == NULL && *nkp == NULL), 1034 ("%s: skp == NULL && nkp == NULL", __FUNCTION__)); 1035#else 1036 KASSERT((*skp == NULL && *nkp == NULL)); 1037#endif 1038 1039 if ((*skp = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL) 1040 return (ENOMEM); 1041 1042 PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af); 1043 PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af); 1044 (*skp)->port[pd->sidx] = sport; 1045 (*skp)->port[pd->didx] = dport; 1046 (*skp)->proto = pd->proto; 1047 (*skp)->af = pd->af; 1048 1049 if (nr != NULL) { 1050 if ((*nkp = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL) 1051 return (ENOMEM); /* caller must handle cleanup */ 1052 1053 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */ 1054 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af); 1055 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af); 1056 (*nkp)->port[0] = (*skp)->port[0]; 1057 (*nkp)->port[1] = (*skp)->port[1]; 1058 (*nkp)->proto = pd->proto; 1059 (*nkp)->af = pd->af; 1060 } else 1061 *nkp = *skp; 1062 1063 if (pd->dir == PF_IN) { 1064 *skw = *skp; 1065 *sks = *nkp; 1066 } else { 1067 *sks = *skp; 1068 *skw = *nkp; 1069 } 1070 return (0); 1071} 1072 1073 1074int 1075pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1076 struct pf_state_key *sks, struct pf_state *s) 1077{ 1078#ifndef __FreeBSD__ 1079 splassert(IPL_SOFTNET); 1080#endif 1081 1082 s->kif = kif; 1083 1084 if (skw == sks) { 1085 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) 1086 return (-1); 1087 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1088 } else { 1089 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) { 1090#ifdef __FreeBSD__ 1091 pool_put(&V_pf_state_key_pl, sks); 1092#else 1093 pool_put(&pf_state_key_pl, sks); 1094#endif 1095 return (-1); 1096 } 1097 if (pf_state_key_attach(sks, s, PF_SK_STACK)) { 1098 pf_state_key_detach(s, PF_SK_WIRE); 1099 return (-1); 1100 } 1101 } 1102 1103 if (s->id == 0 && s->creatorid == 0) { 1104#ifdef __FreeBSD__ 1105 s->id = htobe64(V_pf_status.stateid++); 1106 s->creatorid = V_pf_status.hostid; 1107#else 1108 s->id = htobe64(pf_status.stateid++); 1109 s->creatorid = pf_status.hostid; 1110#endif 1111 } 1112#ifdef __FreeBSD__ 1113 if (RB_INSERT(pf_state_tree_id, &V_tree_id, s) != NULL) { 1114 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1115#else 1116 if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) { 1117 if (pf_status.debug >= PF_DEBUG_MISC) { 1118#endif 1119 printf("pf: state insert failed: " 1120 "id: %016llx creatorid: %08x", 1121#ifdef __FreeBSD__ 1122 (unsigned long long)betoh64(s->id), ntohl(s->creatorid)); 1123#else 1124 betoh64(s->id), ntohl(s->creatorid)); 1125#endif 1126 printf("\n"); 1127 } 1128 pf_detach_state(s); 1129 return (-1); 1130 } 1131#ifdef __FreeBSD__ 1132 TAILQ_INSERT_TAIL(&V_state_list, s, entry_list); 1133 V_pf_status.fcounters[FCNT_STATE_INSERT]++; 1134 V_pf_status.states++; 1135#else 1136 TAILQ_INSERT_TAIL(&state_list, s, entry_list); 1137 pf_status.fcounters[FCNT_STATE_INSERT]++; 1138 pf_status.states++; 1139#endif 1140 pfi_kif_ref(kif, PFI_KIF_REF_STATE); 1141#if NPFSYNC > 0 1142#ifdef __FreeBSD__ 1143 if (pfsync_insert_state_ptr != NULL) 1144 pfsync_insert_state_ptr(s); 1145#else 1146 pfsync_insert_state(s); 1147#endif 1148#endif 1149 return (0); 1150} 1151 1152struct pf_state * 1153pf_find_state_byid(struct pf_state_cmp *key) 1154{ 1155#ifdef __FreeBSD__ 1156 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1157 1158 return (RB_FIND(pf_state_tree_id, &V_tree_id, (struct pf_state *)key)); 1159#else 1160 pf_status.fcounters[FCNT_STATE_SEARCH]++; 1161 1162 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key)); 1163#endif 1164} 1165 1166/* XXX debug function, intended to be removed one day */ 1167int 1168pf_compare_state_keys(struct pf_state_key *a, struct pf_state_key *b, 1169 struct pfi_kif *kif, u_int dir) 1170{ 1171 /* a (from hdr) and b (new) must be exact opposites of each other */ 1172 if (a->af == b->af && a->proto == b->proto && 1173 PF_AEQ(&a->addr[0], &b->addr[1], a->af) && 1174 PF_AEQ(&a->addr[1], &b->addr[0], a->af) && 1175 a->port[0] == b->port[1] && 1176 a->port[1] == b->port[0]) 1177 return (0); 1178 else { 1179 /* mismatch. must not happen. */ 1180 printf("pf: state key linking mismatch! dir=%s, " 1181 "if=%s, stored af=%u, a0: ", 1182 dir == PF_OUT ? "OUT" : "IN", kif->pfik_name, a->af); 1183 pf_print_host(&a->addr[0], a->port[0], a->af); 1184 printf(", a1: "); 1185 pf_print_host(&a->addr[1], a->port[1], a->af); 1186 printf(", proto=%u", a->proto); 1187 printf(", found af=%u, a0: ", b->af); 1188 pf_print_host(&b->addr[0], b->port[0], b->af); 1189 printf(", a1: "); 1190 pf_print_host(&b->addr[1], b->port[1], b->af); 1191 printf(", proto=%u", b->proto); 1192 printf(".\n"); 1193 return (-1); 1194 } 1195} 1196 1197struct pf_state * 1198#ifdef __FreeBSD__ 1199pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir, 1200 struct mbuf *m, struct pf_mtag *pftag) 1201#else 1202pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir, 1203 struct mbuf *m) 1204#endif 1205{ 1206 struct pf_state_key *sk; 1207 struct pf_state_item *si; 1208 1209#ifdef __FreeBSD__ 1210 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1211#else 1212 pf_status.fcounters[FCNT_STATE_SEARCH]++; 1213#endif 1214 1215#ifdef __FreeBSD__ 1216 if (dir == PF_OUT && pftag->statekey && 1217 ((struct pf_state_key *)pftag->statekey)->reverse) 1218 sk = ((struct pf_state_key *)pftag->statekey)->reverse; 1219 else { 1220#ifdef __FreeBSD__ 1221 if ((sk = RB_FIND(pf_state_tree, &V_pf_statetbl, 1222#else 1223 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl, 1224#endif 1225 (struct pf_state_key *)key)) == NULL) 1226 return (NULL); 1227 if (dir == PF_OUT && pftag->statekey && 1228 pf_compare_state_keys(pftag->statekey, sk, 1229 kif, dir) == 0) { 1230 ((struct pf_state_key *) 1231 pftag->statekey)->reverse = sk; 1232 sk->reverse = pftag->statekey; 1233 } 1234 } 1235#else 1236 if (dir == PF_OUT && m->m_pkthdr.pf.statekey && 1237 ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse) 1238 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse; 1239 else { 1240#ifdef __FreeBSD__ 1241 if ((sk = RB_FIND(pf_state_tree, &V_pf_statetbl, 1242#else 1243 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl, 1244#endif 1245 (struct pf_state_key *)key)) == NULL) 1246 return (NULL); 1247 if (dir == PF_OUT && m->m_pkthdr.pf.statekey && 1248 pf_compare_state_keys(m->m_pkthdr.pf.statekey, sk, 1249 kif, dir) == 0) { 1250 ((struct pf_state_key *) 1251 m->m_pkthdr.pf.statekey)->reverse = sk; 1252 sk->reverse = m->m_pkthdr.pf.statekey; 1253 } 1254 } 1255#endif 1256 1257 if (dir == PF_OUT) 1258#ifdef __FreeBSD__ 1259 pftag->statekey = NULL; 1260#else 1261 m->m_pkthdr.pf.statekey = NULL; 1262#endif 1263 1264 /* list is sorted, if-bound states before floating ones */ 1265 TAILQ_FOREACH(si, &sk->states, entry) 1266#ifdef __FreeBSD__ 1267 if ((si->s->kif == V_pfi_all || si->s->kif == kif) && 1268#else 1269 if ((si->s->kif == pfi_all || si->s->kif == kif) && 1270#endif 1271 sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] : 1272 si->s->key[PF_SK_STACK])) 1273 return (si->s); 1274 1275 return (NULL); 1276} 1277 1278struct pf_state * 1279pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1280{ 1281 struct pf_state_key *sk; 1282 struct pf_state_item *si, *ret = NULL; 1283 1284#ifdef __FreeBSD__ 1285 V_pf_status.fcounters[FCNT_STATE_SEARCH]++; 1286#else 1287 pf_status.fcounters[FCNT_STATE_SEARCH]++; 1288#endif 1289 1290#ifdef __FreeBSD__ 1291 sk = RB_FIND(pf_state_tree, &V_pf_statetbl, (struct pf_state_key *)key); 1292#else 1293 sk = RB_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key); 1294#endif 1295 if (sk != NULL) { 1296 TAILQ_FOREACH(si, &sk->states, entry) 1297 if (dir == PF_INOUT || 1298 (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] : 1299 si->s->key[PF_SK_STACK]))) { 1300 if (more == NULL) 1301 return (si->s); 1302 1303 if (ret) 1304 (*more)++; 1305 else 1306 ret = si; 1307 } 1308 } 1309 return (ret ? ret->s : NULL); 1310} 1311 1312/* END state table stuff */ 1313 1314 1315void 1316pf_purge_thread(void *v) 1317{ 1318 int nloops = 0, s; 1319#ifdef __FreeBSD__ 1320 int locked; 1321#endif 1322 1323 CURVNET_SET((struct vnet *)v); 1324 1325 for (;;) { 1326 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 1327 1328#ifdef __FreeBSD__ 1329 sx_slock(&V_pf_consistency_lock); 1330 PF_LOCK(); 1331 locked = 0; 1332 1333 if (V_pf_end_threads) { 1334 PF_UNLOCK(); 1335 sx_sunlock(&V_pf_consistency_lock); 1336 sx_xlock(&V_pf_consistency_lock); 1337 PF_LOCK(); 1338 1339 pf_purge_expired_states(V_pf_status.states, 1); 1340 pf_purge_expired_fragments(); 1341 pf_purge_expired_src_nodes(1); 1342 V_pf_end_threads++; 1343 1344 sx_xunlock(&V_pf_consistency_lock); 1345 PF_UNLOCK(); 1346 wakeup(pf_purge_thread); 1347 kproc_exit(0); 1348 } 1349#endif 1350 s = splsoftnet(); 1351 1352 /* process a fraction of the state table every second */ 1353#ifdef __FreeBSD__ 1354 if (!pf_purge_expired_states(1 + (V_pf_status.states / 1355 V_pf_default_rule.timeout[PFTM_INTERVAL]), 0)) { 1356 PF_UNLOCK(); 1357 sx_sunlock(&V_pf_consistency_lock); 1358 sx_xlock(&V_pf_consistency_lock); 1359 PF_LOCK(); 1360 locked = 1; 1361 1362 pf_purge_expired_states(1 + (V_pf_status.states / 1363 V_pf_default_rule.timeout[PFTM_INTERVAL]), 1); 1364 } 1365#else 1366 pf_purge_expired_states(1 + (pf_status.states 1367 / pf_default_rule.timeout[PFTM_INTERVAL])); 1368#endif 1369 1370 /* purge other expired types every PFTM_INTERVAL seconds */ 1371#ifdef __FreeBSD__ 1372 if (++nloops >= V_pf_default_rule.timeout[PFTM_INTERVAL]) { 1373#else 1374 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) { 1375#endif 1376 pf_purge_expired_fragments(); 1377 pf_purge_expired_src_nodes(0); 1378 nloops = 0; 1379 } 1380 1381 splx(s); 1382#ifdef __FreeBSD__ 1383 PF_UNLOCK(); 1384 if (locked) 1385 sx_xunlock(&V_pf_consistency_lock); 1386 else 1387 sx_sunlock(&V_pf_consistency_lock); 1388#endif 1389 } 1390 CURVNET_RESTORE(); 1391} 1392 1393u_int32_t 1394pf_state_expires(const struct pf_state *state) 1395{ 1396 u_int32_t timeout; 1397 u_int32_t start; 1398 u_int32_t end; 1399 u_int32_t states; 1400 1401 /* handle all PFTM_* > PFTM_MAX here */ 1402 if (state->timeout == PFTM_PURGE) 1403 return (time_second); 1404 if (state->timeout == PFTM_UNTIL_PACKET) 1405 return (0); 1406#ifdef __FreeBSD__ 1407 KASSERT(state->timeout != PFTM_UNLINKED, 1408 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1409 KASSERT((state->timeout < PFTM_MAX), 1410 ("pf_state_expires: timeout > PFTM_MAX")); 1411#else 1412 KASSERT(state->timeout != PFTM_UNLINKED); 1413 KASSERT(state->timeout < PFTM_MAX); 1414#endif 1415 timeout = state->rule.ptr->timeout[state->timeout]; 1416 if (!timeout) 1417#ifdef __FreeBSD__ 1418 timeout = V_pf_default_rule.timeout[state->timeout]; 1419#else 1420 timeout = pf_default_rule.timeout[state->timeout]; 1421#endif 1422 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1423 if (start) { 1424 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1425 states = state->rule.ptr->states_cur; 1426 } else { 1427#ifdef __FreeBSD__ 1428 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1429 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1430 states = V_pf_status.states; 1431#else 1432 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1433 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1434 states = pf_status.states; 1435#endif 1436 } 1437 if (end && states > start && start < end) { 1438 if (states < end) 1439 return (state->expire + timeout * (end - states) / 1440 (end - start)); 1441 else 1442 return (time_second); 1443 } 1444 return (state->expire + timeout); 1445} 1446 1447#ifdef __FreeBSD__ 1448int 1449pf_purge_expired_src_nodes(int waslocked) 1450#else 1451void 1452pf_purge_expired_src_nodes(int waslocked) 1453#endif 1454{ 1455 struct pf_src_node *cur, *next; 1456 int locked = waslocked; 1457 1458#ifdef __FreeBSD__ 1459 for (cur = RB_MIN(pf_src_tree, &V_tree_src_tracking); cur; cur = next) { 1460 next = RB_NEXT(pf_src_tree, &V_tree_src_tracking, cur); 1461#else 1462 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 1463 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 1464#endif 1465 1466 if (cur->states <= 0 && cur->expire <= time_second) { 1467 if (! locked) { 1468#ifdef __FreeBSD__ 1469 if (!sx_try_upgrade(&V_pf_consistency_lock)) 1470 return (0); 1471#else 1472 rw_enter_write(&pf_consistency_lock); 1473#endif 1474 next = RB_NEXT(pf_src_tree, 1475#ifdef __FreeBSD__ 1476 &V_tree_src_tracking, cur); 1477#else 1478 &tree_src_tracking, cur); 1479#endif 1480 locked = 1; 1481 } 1482 if (cur->rule.ptr != NULL) { 1483 cur->rule.ptr->src_nodes--; 1484 if (cur->rule.ptr->states_cur <= 0 && 1485 cur->rule.ptr->max_src_nodes <= 0) 1486 pf_rm_rule(NULL, cur->rule.ptr); 1487 } 1488#ifdef __FreeBSD__ 1489 RB_REMOVE(pf_src_tree, &V_tree_src_tracking, cur); 1490 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1491 V_pf_status.src_nodes--; 1492 pool_put(&V_pf_src_tree_pl, cur); 1493#else 1494 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1495 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1496 pf_status.src_nodes--; 1497 pool_put(&pf_src_tree_pl, cur); 1498#endif 1499 } 1500 } 1501 1502 if (locked && !waslocked) 1503#ifdef __FreeBSD__ 1504 { 1505 sx_downgrade(&V_pf_consistency_lock); 1506 } 1507 return (1); 1508#else 1509 rw_exit_write(&pf_consistency_lock); 1510#endif 1511} 1512 1513void 1514pf_src_tree_remove_state(struct pf_state *s) 1515{ 1516 u_int32_t timeout; 1517 1518 if (s->src_node != NULL) { 1519 if (s->src.tcp_est) 1520 --s->src_node->conn; 1521 if (--s->src_node->states <= 0) { 1522 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1523 if (!timeout) 1524 timeout = 1525#ifdef __FreeBSD__ 1526 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1527#else 1528 pf_default_rule.timeout[PFTM_SRC_NODE]; 1529#endif 1530 s->src_node->expire = time_second + timeout; 1531 } 1532 } 1533 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1534 if (--s->nat_src_node->states <= 0) { 1535 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1536 if (!timeout) 1537 timeout = 1538#ifdef __FreeBSD__ 1539 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1540#else 1541 pf_default_rule.timeout[PFTM_SRC_NODE]; 1542#endif 1543 s->nat_src_node->expire = time_second + timeout; 1544 } 1545 } 1546 s->src_node = s->nat_src_node = NULL; 1547} 1548 1549/* callers should be at splsoftnet */ 1550void 1551pf_unlink_state(struct pf_state *cur) 1552{ 1553#ifdef __FreeBSD__ 1554 if (cur->local_flags & PFSTATE_EXPIRING) 1555 return; 1556 cur->local_flags |= PFSTATE_EXPIRING; 1557#else 1558 splassert(IPL_SOFTNET); 1559#endif 1560 1561 if (cur->src.state == PF_TCPS_PROXY_DST) { 1562 /* XXX wire key the right one? */ 1563#ifdef __FreeBSD__ 1564 pf_send_tcp(NULL, cur->rule.ptr, cur->key[PF_SK_WIRE]->af, 1565#else 1566 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af, 1567#endif 1568 &cur->key[PF_SK_WIRE]->addr[1], 1569 &cur->key[PF_SK_WIRE]->addr[0], 1570 cur->key[PF_SK_WIRE]->port[1], 1571 cur->key[PF_SK_WIRE]->port[0], 1572 cur->src.seqhi, cur->src.seqlo + 1, 1573 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1574 } 1575#ifdef __FreeBSD__ 1576 RB_REMOVE(pf_state_tree_id, &V_tree_id, cur); 1577#else 1578 RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1579#endif 1580#if NPFLOW > 0 1581 if (cur->state_flags & PFSTATE_PFLOW) 1582#ifdef __FreeBSD__ 1583 if (export_pflow_ptr != NULL) 1584 export_pflow_ptr(cur); 1585#else 1586 export_pflow(cur); 1587#endif 1588#endif 1589#if NPFSYNC > 0 1590#ifdef __FreeBSD__ 1591 if (pfsync_delete_state_ptr != NULL) 1592 pfsync_delete_state_ptr(cur); 1593#else 1594 pfsync_delete_state(cur); 1595#endif 1596#endif 1597 cur->timeout = PFTM_UNLINKED; 1598 pf_src_tree_remove_state(cur); 1599 pf_detach_state(cur); 1600} 1601 1602/* callers should be at splsoftnet and hold the 1603 * write_lock on pf_consistency_lock */ 1604void 1605pf_free_state(struct pf_state *cur) 1606{ 1607#ifndef __FreeBSD__ 1608 splassert(IPL_SOFTNET); 1609#endif 1610 1611#if NPFSYNC > 0 1612#ifdef __FreeBSD__ 1613 if (pfsync_state_in_use_ptr != NULL && 1614 pfsync_state_in_use_ptr(cur)) 1615#else 1616 if (pfsync_state_in_use(cur)) 1617#endif 1618 return; 1619#endif 1620#ifdef __FreeBSD__ 1621 KASSERT(cur->timeout == PFTM_UNLINKED, 1622 ("pf_free_state: cur->timeout != PFTM_UNLINKED")); 1623#else 1624 KASSERT(cur->timeout == PFTM_UNLINKED); 1625#endif 1626 if (--cur->rule.ptr->states_cur <= 0 && 1627 cur->rule.ptr->src_nodes <= 0) 1628 pf_rm_rule(NULL, cur->rule.ptr); 1629 if (cur->nat_rule.ptr != NULL) 1630 if (--cur->nat_rule.ptr->states_cur <= 0 && 1631 cur->nat_rule.ptr->src_nodes <= 0) 1632 pf_rm_rule(NULL, cur->nat_rule.ptr); 1633 if (cur->anchor.ptr != NULL) 1634 if (--cur->anchor.ptr->states_cur <= 0) 1635 pf_rm_rule(NULL, cur->anchor.ptr); 1636 pf_normalize_tcp_cleanup(cur); 1637 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE); 1638#ifdef __FreeBSD__ 1639 TAILQ_REMOVE(&V_state_list, cur, entry_list); 1640#else 1641 TAILQ_REMOVE(&state_list, cur, entry_list); 1642#endif 1643 if (cur->tag) 1644 pf_tag_unref(cur->tag); 1645#ifdef __FreeBSD__ 1646 pool_put(&V_pf_state_pl, cur); 1647 V_pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1648 V_pf_status.states--; 1649#else 1650 pool_put(&pf_state_pl, cur); 1651 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1652 pf_status.states--; 1653#endif 1654} 1655 1656#ifdef __FreeBSD__ 1657int 1658pf_purge_expired_states(u_int32_t maxcheck, int waslocked) 1659#else 1660void 1661pf_purge_expired_states(u_int32_t maxcheck) 1662#endif 1663{ 1664 static struct pf_state *cur = NULL; 1665 struct pf_state *next; 1666#ifdef __FreeBSD__ 1667 int locked = waslocked; 1668#else 1669 int locked = 0; 1670#endif 1671 1672 while (maxcheck--) { 1673 /* wrap to start of list when we hit the end */ 1674 if (cur == NULL) { 1675#ifdef __FreeBSD__ 1676 cur = TAILQ_FIRST(&V_state_list); 1677#else 1678 cur = TAILQ_FIRST(&state_list); 1679#endif 1680 if (cur == NULL) 1681 break; /* list empty */ 1682 } 1683 1684 /* get next state, as cur may get deleted */ 1685 next = TAILQ_NEXT(cur, entry_list); 1686 1687 if (cur->timeout == PFTM_UNLINKED) { 1688 /* free unlinked state */ 1689 if (! locked) { 1690#ifdef __FreeBSD__ 1691 if (!sx_try_upgrade(&V_pf_consistency_lock)) 1692 return (0); 1693#else 1694 rw_enter_write(&pf_consistency_lock); 1695#endif 1696 locked = 1; 1697 } 1698 pf_free_state(cur); 1699 } else if (pf_state_expires(cur) <= time_second) { 1700 /* unlink and free expired state */ 1701 pf_unlink_state(cur); 1702 if (! locked) { 1703#ifdef __FreeBSD__ 1704 if (!sx_try_upgrade(&V_pf_consistency_lock)) 1705 return (0); 1706#else 1707 rw_enter_write(&pf_consistency_lock); 1708#endif 1709 locked = 1; 1710 } 1711 pf_free_state(cur); 1712 } 1713 cur = next; 1714 } 1715 1716#ifdef __FreeBSD__ 1717 if (!waslocked && locked) 1718 sx_downgrade(&V_pf_consistency_lock); 1719 1720 return (1); 1721#else 1722 if (locked) 1723 rw_exit_write(&pf_consistency_lock); 1724#endif 1725} 1726 1727int 1728pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1729{ 1730 if (aw->type != PF_ADDR_TABLE) 1731 return (0); 1732 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname, 1)) == NULL) 1733 return (1); 1734 return (0); 1735} 1736 1737void 1738pf_tbladdr_remove(struct pf_addr_wrap *aw) 1739{ 1740 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1741 return; 1742 pfr_detach_table(aw->p.tbl); 1743 aw->p.tbl = NULL; 1744} 1745 1746void 1747pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1748{ 1749 struct pfr_ktable *kt = aw->p.tbl; 1750 1751 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1752 return; 1753 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1754 kt = kt->pfrkt_root; 1755 aw->p.tbl = NULL; 1756 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1757 kt->pfrkt_cnt : -1; 1758} 1759 1760void 1761pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1762{ 1763 switch (af) { 1764#ifdef INET 1765 case AF_INET: { 1766 u_int32_t a = ntohl(addr->addr32[0]); 1767 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1768 (a>>8)&255, a&255); 1769 if (p) { 1770 p = ntohs(p); 1771 printf(":%u", p); 1772 } 1773 break; 1774 } 1775#endif /* INET */ 1776#ifdef INET6 1777 case AF_INET6: { 1778 u_int16_t b; 1779 u_int8_t i, curstart, curend, maxstart, maxend; 1780 curstart = curend = maxstart = maxend = 255; 1781 for (i = 0; i < 8; i++) { 1782 if (!addr->addr16[i]) { 1783 if (curstart == 255) 1784 curstart = i; 1785 curend = i; 1786 } else { 1787 if ((curend - curstart) > 1788 (maxend - maxstart)) { 1789 maxstart = curstart; 1790 maxend = curend; 1791 } 1792 curstart = curend = 255; 1793 } 1794 } 1795 if ((curend - curstart) > 1796 (maxend - maxstart)) { 1797 maxstart = curstart; 1798 maxend = curend; 1799 } 1800 for (i = 0; i < 8; i++) { 1801 if (i >= maxstart && i <= maxend) { 1802 if (i == 0) 1803 printf(":"); 1804 if (i == maxend) 1805 printf(":"); 1806 } else { 1807 b = ntohs(addr->addr16[i]); 1808 printf("%x", b); 1809 if (i < 7) 1810 printf(":"); 1811 } 1812 } 1813 if (p) { 1814 p = ntohs(p); 1815 printf("[%u]", p); 1816 } 1817 break; 1818 } 1819#endif /* INET6 */ 1820 } 1821} 1822 1823void 1824pf_print_state(struct pf_state *s) 1825{ 1826 pf_print_state_parts(s, NULL, NULL); 1827} 1828 1829void 1830pf_print_state_parts(struct pf_state *s, 1831 struct pf_state_key *skwp, struct pf_state_key *sksp) 1832{ 1833 struct pf_state_key *skw, *sks; 1834 u_int8_t proto, dir; 1835 1836 /* Do our best to fill these, but they're skipped if NULL */ 1837 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1838 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1839 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1840 dir = s ? s->direction : 0; 1841 1842 switch (proto) { 1843 case IPPROTO_IPV4: 1844 printf("IPv4"); 1845 break; 1846 case IPPROTO_IPV6: 1847 printf("IPv6"); 1848 break; 1849 case IPPROTO_TCP: 1850 printf("TCP"); 1851 break; 1852 case IPPROTO_UDP: 1853 printf("UDP"); 1854 break; 1855 case IPPROTO_ICMP: 1856 printf("ICMP"); 1857 break; 1858 case IPPROTO_ICMPV6: 1859 printf("ICMPv6"); 1860 break; 1861 default: 1862 printf("%u", skw->proto); 1863 break; 1864 } 1865 switch (dir) { 1866 case PF_IN: 1867 printf(" in"); 1868 break; 1869 case PF_OUT: 1870 printf(" out"); 1871 break; 1872 } 1873 if (skw) { 1874 printf(" wire: "); 1875 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1876 printf(" "); 1877 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1878 } 1879 if (sks) { 1880 printf(" stack: "); 1881 if (sks != skw) { 1882 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1883 printf(" "); 1884 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1885 } else 1886 printf("-"); 1887 } 1888 if (s) { 1889 if (proto == IPPROTO_TCP) { 1890 printf(" [lo=%u high=%u win=%u modulator=%u", 1891 s->src.seqlo, s->src.seqhi, 1892 s->src.max_win, s->src.seqdiff); 1893 if (s->src.wscale && s->dst.wscale) 1894 printf(" wscale=%u", 1895 s->src.wscale & PF_WSCALE_MASK); 1896 printf("]"); 1897 printf(" [lo=%u high=%u win=%u modulator=%u", 1898 s->dst.seqlo, s->dst.seqhi, 1899 s->dst.max_win, s->dst.seqdiff); 1900 if (s->src.wscale && s->dst.wscale) 1901 printf(" wscale=%u", 1902 s->dst.wscale & PF_WSCALE_MASK); 1903 printf("]"); 1904 } 1905 printf(" %u:%u", s->src.state, s->dst.state); 1906 } 1907} 1908 1909void 1910pf_print_flags(u_int8_t f) 1911{ 1912 if (f) 1913 printf(" "); 1914 if (f & TH_FIN) 1915 printf("F"); 1916 if (f & TH_SYN) 1917 printf("S"); 1918 if (f & TH_RST) 1919 printf("R"); 1920 if (f & TH_PUSH) 1921 printf("P"); 1922 if (f & TH_ACK) 1923 printf("A"); 1924 if (f & TH_URG) 1925 printf("U"); 1926 if (f & TH_ECE) 1927 printf("E"); 1928 if (f & TH_CWR) 1929 printf("W"); 1930} 1931 1932#define PF_SET_SKIP_STEPS(i) \ 1933 do { \ 1934 while (head[i] != cur) { \ 1935 head[i]->skip[i].ptr = cur; \ 1936 head[i] = TAILQ_NEXT(head[i], entries); \ 1937 } \ 1938 } while (0) 1939 1940void 1941pf_calc_skip_steps(struct pf_rulequeue *rules) 1942{ 1943 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1944 int i; 1945 1946 cur = TAILQ_FIRST(rules); 1947 prev = cur; 1948 for (i = 0; i < PF_SKIP_COUNT; ++i) 1949 head[i] = cur; 1950 while (cur != NULL) { 1951 1952 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1953 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1954 if (cur->direction != prev->direction) 1955 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1956 if (cur->af != prev->af) 1957 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1958 if (cur->proto != prev->proto) 1959 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1960 if (cur->src.neg != prev->src.neg || 1961 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1962 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1963 if (cur->src.port[0] != prev->src.port[0] || 1964 cur->src.port[1] != prev->src.port[1] || 1965 cur->src.port_op != prev->src.port_op) 1966 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1967 if (cur->dst.neg != prev->dst.neg || 1968 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1969 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1970 if (cur->dst.port[0] != prev->dst.port[0] || 1971 cur->dst.port[1] != prev->dst.port[1] || 1972 cur->dst.port_op != prev->dst.port_op) 1973 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1974 1975 prev = cur; 1976 cur = TAILQ_NEXT(cur, entries); 1977 } 1978 for (i = 0; i < PF_SKIP_COUNT; ++i) 1979 PF_SET_SKIP_STEPS(i); 1980} 1981 1982int 1983pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1984{ 1985 if (aw1->type != aw2->type) 1986 return (1); 1987 switch (aw1->type) { 1988 case PF_ADDR_ADDRMASK: 1989 case PF_ADDR_RANGE: 1990 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1991 return (1); 1992 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1993 return (1); 1994 return (0); 1995 case PF_ADDR_DYNIFTL: 1996 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1997 case PF_ADDR_NOROUTE: 1998 case PF_ADDR_URPFFAILED: 1999 return (0); 2000 case PF_ADDR_TABLE: 2001 return (aw1->p.tbl != aw2->p.tbl); 2002 case PF_ADDR_RTLABEL: 2003 return (aw1->v.rtlabel != aw2->v.rtlabel); 2004 default: 2005 printf("invalid address type: %d\n", aw1->type); 2006 return (1); 2007 } 2008} 2009 2010u_int16_t 2011pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2012{ 2013 u_int32_t l; 2014 2015 if (udp && !cksum) 2016 return (0x0000); 2017 l = cksum + old - new; 2018 l = (l >> 16) + (l & 65535); 2019 l = l & 65535; 2020 if (udp && !l) 2021 return (0xFFFF); 2022 return (l); 2023} 2024 2025void 2026pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 2027 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 2028{ 2029 struct pf_addr ao; 2030 u_int16_t po = *p; 2031 2032 PF_ACPY(&ao, a, af); 2033 PF_ACPY(a, an, af); 2034 2035 *p = pn; 2036 2037 switch (af) { 2038#ifdef INET 2039 case AF_INET: 2040 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2041 ao.addr16[0], an->addr16[0], 0), 2042 ao.addr16[1], an->addr16[1], 0); 2043 *p = pn; 2044 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2045 ao.addr16[0], an->addr16[0], u), 2046 ao.addr16[1], an->addr16[1], u), 2047 po, pn, u); 2048 break; 2049#endif /* INET */ 2050#ifdef INET6 2051 case AF_INET6: 2052 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2053 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2054 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2055 ao.addr16[0], an->addr16[0], u), 2056 ao.addr16[1], an->addr16[1], u), 2057 ao.addr16[2], an->addr16[2], u), 2058 ao.addr16[3], an->addr16[3], u), 2059 ao.addr16[4], an->addr16[4], u), 2060 ao.addr16[5], an->addr16[5], u), 2061 ao.addr16[6], an->addr16[6], u), 2062 ao.addr16[7], an->addr16[7], u), 2063 po, pn, u); 2064 break; 2065#endif /* INET6 */ 2066 } 2067} 2068 2069 2070/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2071void 2072pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2073{ 2074 u_int32_t ao; 2075 2076 memcpy(&ao, a, sizeof(ao)); 2077 memcpy(a, &an, sizeof(u_int32_t)); 2078 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2079 ao % 65536, an % 65536, u); 2080} 2081 2082#ifdef INET6 2083void 2084pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2085{ 2086 struct pf_addr ao; 2087 2088 PF_ACPY(&ao, a, AF_INET6); 2089 PF_ACPY(a, an, AF_INET6); 2090 2091 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2092 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2093 pf_cksum_fixup(pf_cksum_fixup(*c, 2094 ao.addr16[0], an->addr16[0], u), 2095 ao.addr16[1], an->addr16[1], u), 2096 ao.addr16[2], an->addr16[2], u), 2097 ao.addr16[3], an->addr16[3], u), 2098 ao.addr16[4], an->addr16[4], u), 2099 ao.addr16[5], an->addr16[5], u), 2100 ao.addr16[6], an->addr16[6], u), 2101 ao.addr16[7], an->addr16[7], u); 2102} 2103#endif /* INET6 */ 2104 2105void 2106pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2107 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2108 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2109{ 2110 struct pf_addr oia, ooa; 2111 2112 PF_ACPY(&oia, ia, af); 2113 if (oa) 2114 PF_ACPY(&ooa, oa, af); 2115 2116 /* Change inner protocol port, fix inner protocol checksum. */ 2117 if (ip != NULL) { 2118 u_int16_t oip = *ip; 2119 u_int32_t opc; 2120 2121 if (pc != NULL) 2122 opc = *pc; 2123 *ip = np; 2124 if (pc != NULL) 2125 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2126 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2127 if (pc != NULL) 2128 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2129 } 2130 /* Change inner ip address, fix inner ip and icmp checksums. */ 2131 PF_ACPY(ia, na, af); 2132 switch (af) { 2133#ifdef INET 2134 case AF_INET: { 2135 u_int32_t oh2c = *h2c; 2136 2137 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2138 oia.addr16[0], ia->addr16[0], 0), 2139 oia.addr16[1], ia->addr16[1], 0); 2140 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2141 oia.addr16[0], ia->addr16[0], 0), 2142 oia.addr16[1], ia->addr16[1], 0); 2143 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2144 break; 2145 } 2146#endif /* INET */ 2147#ifdef INET6 2148 case AF_INET6: 2149 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2150 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2151 pf_cksum_fixup(pf_cksum_fixup(*ic, 2152 oia.addr16[0], ia->addr16[0], u), 2153 oia.addr16[1], ia->addr16[1], u), 2154 oia.addr16[2], ia->addr16[2], u), 2155 oia.addr16[3], ia->addr16[3], u), 2156 oia.addr16[4], ia->addr16[4], u), 2157 oia.addr16[5], ia->addr16[5], u), 2158 oia.addr16[6], ia->addr16[6], u), 2159 oia.addr16[7], ia->addr16[7], u); 2160 break; 2161#endif /* INET6 */ 2162 } 2163 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2164 if (oa) { 2165 PF_ACPY(oa, na, af); 2166 switch (af) { 2167#ifdef INET 2168 case AF_INET: 2169 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2170 ooa.addr16[0], oa->addr16[0], 0), 2171 ooa.addr16[1], oa->addr16[1], 0); 2172 break; 2173#endif /* INET */ 2174#ifdef INET6 2175 case AF_INET6: 2176 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2177 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2178 pf_cksum_fixup(pf_cksum_fixup(*ic, 2179 ooa.addr16[0], oa->addr16[0], u), 2180 ooa.addr16[1], oa->addr16[1], u), 2181 ooa.addr16[2], oa->addr16[2], u), 2182 ooa.addr16[3], oa->addr16[3], u), 2183 ooa.addr16[4], oa->addr16[4], u), 2184 ooa.addr16[5], oa->addr16[5], u), 2185 ooa.addr16[6], oa->addr16[6], u), 2186 ooa.addr16[7], oa->addr16[7], u); 2187 break; 2188#endif /* INET6 */ 2189 } 2190 } 2191} 2192 2193 2194/* 2195 * Need to modulate the sequence numbers in the TCP SACK option 2196 * (credits to Krzysztof Pfaff for report and patch) 2197 */ 2198int 2199pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2200 struct tcphdr *th, struct pf_state_peer *dst) 2201{ 2202 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2203#ifdef __FreeBSD__ 2204 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2205#else 2206 u_int8_t opts[MAX_TCPOPTLEN], *opt = opts; 2207#endif 2208 int copyback = 0, i, olen; 2209 struct sackblk sack; 2210 2211#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2212 if (hlen < TCPOLEN_SACKLEN || 2213 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2214 return 0; 2215 2216 while (hlen >= TCPOLEN_SACKLEN) { 2217 olen = opt[1]; 2218 switch (*opt) { 2219 case TCPOPT_EOL: /* FALLTHROUGH */ 2220 case TCPOPT_NOP: 2221 opt++; 2222 hlen--; 2223 break; 2224 case TCPOPT_SACK: 2225 if (olen > hlen) 2226 olen = hlen; 2227 if (olen >= TCPOLEN_SACKLEN) { 2228 for (i = 2; i + TCPOLEN_SACK <= olen; 2229 i += TCPOLEN_SACK) { 2230 memcpy(&sack, &opt[i], sizeof(sack)); 2231 pf_change_a(&sack.start, &th->th_sum, 2232 htonl(ntohl(sack.start) - 2233 dst->seqdiff), 0); 2234 pf_change_a(&sack.end, &th->th_sum, 2235 htonl(ntohl(sack.end) - 2236 dst->seqdiff), 0); 2237 memcpy(&opt[i], &sack, sizeof(sack)); 2238 } 2239 copyback = 1; 2240 } 2241 /* FALLTHROUGH */ 2242 default: 2243 if (olen < 2) 2244 olen = 2; 2245 hlen -= olen; 2246 opt += olen; 2247 } 2248 } 2249 2250 if (copyback) 2251#ifdef __FreeBSD__ 2252 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2253#else 2254 m_copyback(m, off + sizeof(*th), thoptlen, opts); 2255#endif 2256 return (copyback); 2257} 2258 2259void 2260#ifdef __FreeBSD__ 2261pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2262#else 2263pf_send_tcp(const struct pf_rule *r, sa_family_t af, 2264#endif 2265 const struct pf_addr *saddr, const struct pf_addr *daddr, 2266 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2267 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2268 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 2269{ 2270 struct mbuf *m; 2271 int len, tlen; 2272#ifdef INET 2273 struct ip *h; 2274#endif /* INET */ 2275#ifdef INET6 2276 struct ip6_hdr *h6; 2277#endif /* INET6 */ 2278 struct tcphdr *th; 2279 char *opt; 2280#ifdef __FreeBSD__ 2281 struct pf_mtag *pf_mtag; 2282 2283 KASSERT( 2284#ifdef INET 2285 af == AF_INET 2286#else 2287 0 2288#endif 2289 || 2290#ifdef INET6 2291 af == AF_INET6 2292#else 2293 0 2294#endif 2295 , ("Unsupported AF %d", af)); 2296 len = 0; 2297 th = NULL; 2298#ifdef INET 2299 h = NULL; 2300#endif 2301#ifdef INET6 2302 h6 = NULL; 2303#endif 2304#endif /* __FreeBSD__ */ 2305 2306 /* maximum segment size tcp option */ 2307 tlen = sizeof(struct tcphdr); 2308 if (mss) 2309 tlen += 4; 2310 2311 switch (af) { 2312#ifdef INET 2313 case AF_INET: 2314 len = sizeof(struct ip) + tlen; 2315 break; 2316#endif /* INET */ 2317#ifdef INET6 2318 case AF_INET6: 2319 len = sizeof(struct ip6_hdr) + tlen; 2320 break; 2321#endif /* INET6 */ 2322 } 2323 2324 /* create outgoing mbuf */ 2325 m = m_gethdr(M_DONTWAIT, MT_HEADER); 2326 if (m == NULL) 2327 return; 2328#ifdef __FreeBSD__ 2329#ifdef MAC 2330 mac_netinet_firewall_send(m); 2331#endif 2332 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2333 m_freem(m); 2334 return; 2335 } 2336#endif 2337 if (tag) 2338#ifdef __FreeBSD__ 2339 m->m_flags |= M_SKIP_FIREWALL; 2340 pf_mtag->tag = rtag; 2341#else 2342 m->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 2343 m->m_pkthdr.pf.tag = rtag; 2344#endif 2345 2346 if (r != NULL && r->rtableid >= 0) 2347#ifdef __FreeBSD__ 2348 { 2349 M_SETFIB(m, r->rtableid); 2350 pf_mtag->rtableid = r->rtableid; 2351#else 2352 m->m_pkthdr.pf.rtableid = r->rtableid; 2353#endif 2354#ifdef __FreeBSD__ 2355 } 2356#endif 2357 2358#ifdef ALTQ 2359 if (r != NULL && r->qid) { 2360#ifdef __FreeBSD__ 2361 pf_mtag->qid = r->qid; 2362 2363 /* add hints for ecn */ 2364 pf_mtag->hdr = mtod(m, struct ip *); 2365#else 2366 m->m_pkthdr.pf.qid = r->qid; 2367 /* add hints for ecn */ 2368 m->m_pkthdr.pf.hdr = mtod(m, struct ip *); 2369#endif 2370 } 2371#endif /* ALTQ */ 2372 m->m_data += max_linkhdr; 2373 m->m_pkthdr.len = m->m_len = len; 2374 m->m_pkthdr.rcvif = NULL; 2375 bzero(m->m_data, len); 2376 switch (af) { 2377#ifdef INET 2378 case AF_INET: 2379 h = mtod(m, struct ip *); 2380 2381 /* IP header fields included in the TCP checksum */ 2382 h->ip_p = IPPROTO_TCP; 2383 h->ip_len = htons(tlen); 2384 h->ip_src.s_addr = saddr->v4.s_addr; 2385 h->ip_dst.s_addr = daddr->v4.s_addr; 2386 2387 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2388 break; 2389#endif /* INET */ 2390#ifdef INET6 2391 case AF_INET6: 2392 h6 = mtod(m, struct ip6_hdr *); 2393 2394 /* IP header fields included in the TCP checksum */ 2395 h6->ip6_nxt = IPPROTO_TCP; 2396 h6->ip6_plen = htons(tlen); 2397 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2398 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2399 2400 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2401 break; 2402#endif /* INET6 */ 2403 } 2404 2405 /* TCP header */ 2406 th->th_sport = sport; 2407 th->th_dport = dport; 2408 th->th_seq = htonl(seq); 2409 th->th_ack = htonl(ack); 2410 th->th_off = tlen >> 2; 2411 th->th_flags = flags; 2412 th->th_win = htons(win); 2413 2414 if (mss) { 2415 opt = (char *)(th + 1); 2416 opt[0] = TCPOPT_MAXSEG; 2417 opt[1] = 4; 2418 HTONS(mss); 2419 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2420 } 2421 2422 switch (af) { 2423#ifdef INET 2424 case AF_INET: 2425 /* TCP checksum */ 2426 th->th_sum = in_cksum(m, len); 2427 2428 /* Finish the IP header */ 2429 h->ip_v = 4; 2430 h->ip_hl = sizeof(*h) >> 2; 2431 h->ip_tos = IPTOS_LOWDELAY; 2432#ifdef __FreeBSD__ 2433 h->ip_off = V_path_mtu_discovery ? IP_DF : 0; 2434 h->ip_len = len; 2435 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2436#else 2437 h->ip_len = htons(len); 2438 h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 2439 h->ip_ttl = ttl ? ttl : ip_defttl; 2440#endif 2441 h->ip_sum = 0; 2442 if (eh == NULL) { 2443#ifdef __FreeBSD__ 2444 PF_UNLOCK(); 2445 ip_output(m, (void *)NULL, (void *)NULL, 0, 2446 (void *)NULL, (void *)NULL); 2447 PF_LOCK(); 2448#else /* ! __FreeBSD__ */ 2449 ip_output(m, (void *)NULL, (void *)NULL, 0, 2450 (void *)NULL, (void *)NULL); 2451#endif 2452 } else { 2453 struct route ro; 2454 struct rtentry rt; 2455 struct ether_header *e = (void *)ro.ro_dst.sa_data; 2456 2457 if (ifp == NULL) { 2458 m_freem(m); 2459 return; 2460 } 2461 rt.rt_ifp = ifp; 2462 ro.ro_rt = &rt; 2463 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 2464 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 2465 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 2466 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 2467 e->ether_type = eh->ether_type; 2468#ifdef __FreeBSD__ 2469 PF_UNLOCK(); 2470 /* XXX_IMPORT: later */ 2471 ip_output(m, (void *)NULL, &ro, 0, 2472 (void *)NULL, (void *)NULL); 2473 PF_LOCK(); 2474#else /* ! __FreeBSD__ */ 2475 ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 2476 (void *)NULL, (void *)NULL); 2477#endif 2478 } 2479 break; 2480#endif /* INET */ 2481#ifdef INET6 2482 case AF_INET6: 2483 /* TCP checksum */ 2484 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2485 sizeof(struct ip6_hdr), tlen); 2486 2487 h6->ip6_vfc |= IPV6_VERSION; 2488 h6->ip6_hlim = IPV6_DEFHLIM; 2489 2490#ifdef __FreeBSD__ 2491 PF_UNLOCK(); 2492 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 2493 PF_LOCK(); 2494#else 2495 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 2496#endif 2497 break; 2498#endif /* INET6 */ 2499 } 2500} 2501 2502static void 2503pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2504 struct pf_rule *r) 2505{ 2506 struct mbuf *m0; 2507#ifdef __FreeBSD__ 2508#ifdef INET 2509 struct ip *ip; 2510#endif 2511 struct pf_mtag *pf_mtag; 2512#endif 2513 2514#ifdef __FreeBSD__ 2515 m0 = m_copypacket(m, M_DONTWAIT); 2516 if (m0 == NULL) 2517 return; 2518#else 2519 if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL) 2520 return; 2521#endif 2522 2523#ifdef __FreeBSD__ 2524 if ((pf_mtag = pf_get_mtag(m0)) == NULL) 2525 return; 2526 /* XXX: revisit */ 2527 m0->m_flags |= M_SKIP_FIREWALL; 2528#else 2529 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 2530#endif 2531 2532 if (r->rtableid >= 0) 2533#ifdef __FreeBSD__ 2534 { 2535 M_SETFIB(m0, r->rtableid); 2536 pf_mtag->rtableid = r->rtableid; 2537#else 2538 m0->m_pkthdr.pf.rtableid = r->rtableid; 2539#endif 2540#ifdef __FreeBSD__ 2541 } 2542#endif 2543 2544#ifdef ALTQ 2545 if (r->qid) { 2546#ifdef __FreeBSD__ 2547 pf_mtag->qid = r->qid; 2548 /* add hints for ecn */ 2549 pf_mtag->hdr = mtod(m0, struct ip *); 2550#else 2551 m0->m_pkthdr.pf.qid = r->qid; 2552 /* add hints for ecn */ 2553 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *); 2554#endif 2555 } 2556#endif /* ALTQ */ 2557 2558 switch (af) { 2559#ifdef INET 2560 case AF_INET: 2561#ifdef __FreeBSD__ 2562 /* icmp_error() expects host byte ordering */ 2563 ip = mtod(m0, struct ip *); 2564 NTOHS(ip->ip_len); 2565 NTOHS(ip->ip_off); 2566 PF_UNLOCK(); 2567 icmp_error(m0, type, code, 0, 0); 2568 PF_LOCK(); 2569#else 2570 icmp_error(m0, type, code, 0, 0); 2571#endif 2572 break; 2573#endif /* INET */ 2574#ifdef INET6 2575 case AF_INET6: 2576#ifdef __FreeBSD__ 2577 PF_UNLOCK(); 2578#endif 2579 icmp6_error(m0, type, code, 0); 2580#ifdef __FreeBSD__ 2581 PF_LOCK(); 2582#endif 2583 break; 2584#endif /* INET6 */ 2585 } 2586} 2587 2588/* 2589 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2590 * If n is 0, they match if they are equal. If n is != 0, they match if they 2591 * are different. 2592 */ 2593int 2594pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2595 struct pf_addr *b, sa_family_t af) 2596{ 2597 int match = 0; 2598 2599 switch (af) { 2600#ifdef INET 2601 case AF_INET: 2602 if ((a->addr32[0] & m->addr32[0]) == 2603 (b->addr32[0] & m->addr32[0])) 2604 match++; 2605 break; 2606#endif /* INET */ 2607#ifdef INET6 2608 case AF_INET6: 2609 if (((a->addr32[0] & m->addr32[0]) == 2610 (b->addr32[0] & m->addr32[0])) && 2611 ((a->addr32[1] & m->addr32[1]) == 2612 (b->addr32[1] & m->addr32[1])) && 2613 ((a->addr32[2] & m->addr32[2]) == 2614 (b->addr32[2] & m->addr32[2])) && 2615 ((a->addr32[3] & m->addr32[3]) == 2616 (b->addr32[3] & m->addr32[3]))) 2617 match++; 2618 break; 2619#endif /* INET6 */ 2620 } 2621 if (match) { 2622 if (n) 2623 return (0); 2624 else 2625 return (1); 2626 } else { 2627 if (n) 2628 return (1); 2629 else 2630 return (0); 2631 } 2632} 2633 2634/* 2635 * Return 1 if b <= a <= e, otherwise return 0. 2636 */ 2637int 2638pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2639 struct pf_addr *a, sa_family_t af) 2640{ 2641 switch (af) { 2642#ifdef INET 2643 case AF_INET: 2644 if ((a->addr32[0] < b->addr32[0]) || 2645 (a->addr32[0] > e->addr32[0])) 2646 return (0); 2647 break; 2648#endif /* INET */ 2649#ifdef INET6 2650 case AF_INET6: { 2651 int i; 2652 2653 /* check a >= b */ 2654 for (i = 0; i < 4; ++i) 2655 if (a->addr32[i] > b->addr32[i]) 2656 break; 2657 else if (a->addr32[i] < b->addr32[i]) 2658 return (0); 2659 /* check a <= e */ 2660 for (i = 0; i < 4; ++i) 2661 if (a->addr32[i] < e->addr32[i]) 2662 break; 2663 else if (a->addr32[i] > e->addr32[i]) 2664 return (0); 2665 break; 2666 } 2667#endif /* INET6 */ 2668 } 2669 return (1); 2670} 2671 2672int 2673pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2674{ 2675 switch (op) { 2676 case PF_OP_IRG: 2677 return ((p > a1) && (p < a2)); 2678 case PF_OP_XRG: 2679 return ((p < a1) || (p > a2)); 2680 case PF_OP_RRG: 2681 return ((p >= a1) && (p <= a2)); 2682 case PF_OP_EQ: 2683 return (p == a1); 2684 case PF_OP_NE: 2685 return (p != a1); 2686 case PF_OP_LT: 2687 return (p < a1); 2688 case PF_OP_LE: 2689 return (p <= a1); 2690 case PF_OP_GT: 2691 return (p > a1); 2692 case PF_OP_GE: 2693 return (p >= a1); 2694 } 2695 return (0); /* never reached */ 2696} 2697 2698int 2699pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2700{ 2701 NTOHS(a1); 2702 NTOHS(a2); 2703 NTOHS(p); 2704 return (pf_match(op, a1, a2, p)); 2705} 2706 2707int 2708pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2709{ 2710 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2711 return (0); 2712 return (pf_match(op, a1, a2, u)); 2713} 2714 2715int 2716pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2717{ 2718 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2719 return (0); 2720 return (pf_match(op, a1, a2, g)); 2721} 2722 2723int 2724#ifdef __FreeBSD__ 2725pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, 2726 struct pf_mtag *pf_mtag) 2727#else 2728pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag) 2729#endif 2730{ 2731 if (*tag == -1) 2732#ifdef __FreeBSD__ 2733 *tag = pf_mtag->tag; 2734#else 2735 *tag = m->m_pkthdr.pf.tag; 2736#endif 2737 2738 return ((!r->match_tag_not && r->match_tag == *tag) || 2739 (r->match_tag_not && r->match_tag != *tag)); 2740} 2741 2742int 2743#ifdef __FreeBSD__ 2744pf_tag_packet(struct mbuf *m, int tag, int rtableid, 2745 struct pf_mtag *pf_mtag) 2746#else 2747pf_tag_packet(struct mbuf *m, int tag, int rtableid) 2748#endif 2749{ 2750 if (tag <= 0 && rtableid < 0) 2751 return (0); 2752 2753 if (tag > 0) 2754#ifdef __FreeBSD__ 2755 pf_mtag->tag = tag; 2756#else 2757 m->m_pkthdr.pf.tag = tag; 2758#endif 2759 if (rtableid >= 0) 2760#ifdef __FreeBSD__ 2761 { 2762 M_SETFIB(m, rtableid); 2763 } 2764#else 2765 m->m_pkthdr.pf.rtableid = rtableid; 2766#endif 2767 2768 return (0); 2769} 2770 2771void 2772pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2773 struct pf_rule **r, struct pf_rule **a, int *match) 2774{ 2775 struct pf_anchor_stackframe *f; 2776 2777 (*r)->anchor->match = 0; 2778 if (match) 2779 *match = 0; 2780#ifdef __FreeBSD__ 2781 if (*depth >= sizeof(V_pf_anchor_stack) / 2782 sizeof(V_pf_anchor_stack[0])) { 2783#else 2784 if (*depth >= sizeof(pf_anchor_stack) / 2785 sizeof(pf_anchor_stack[0])) { 2786#endif 2787 printf("pf_step_into_anchor: stack overflow\n"); 2788 *r = TAILQ_NEXT(*r, entries); 2789 return; 2790 } else if (*depth == 0 && a != NULL) 2791 *a = *r; 2792#ifdef __FreeBSD__ 2793 f = V_pf_anchor_stack + (*depth)++; 2794#else 2795 f = pf_anchor_stack + (*depth)++; 2796#endif 2797 f->rs = *rs; 2798 f->r = *r; 2799 if ((*r)->anchor_wildcard) { 2800 f->parent = &(*r)->anchor->children; 2801 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2802 NULL) { 2803 *r = NULL; 2804 return; 2805 } 2806 *rs = &f->child->ruleset; 2807 } else { 2808 f->parent = NULL; 2809 f->child = NULL; 2810 *rs = &(*r)->anchor->ruleset; 2811 } 2812 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2813} 2814 2815int 2816pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2817 struct pf_rule **r, struct pf_rule **a, int *match) 2818{ 2819 struct pf_anchor_stackframe *f; 2820 int quick = 0; 2821 2822 do { 2823 if (*depth <= 0) 2824 break; 2825#ifdef __FreeBSD__ 2826 f = V_pf_anchor_stack + *depth - 1; 2827#else 2828 f = pf_anchor_stack + *depth - 1; 2829#endif 2830 if (f->parent != NULL && f->child != NULL) { 2831 if (f->child->match || 2832 (match != NULL && *match)) { 2833 f->r->anchor->match = 1; 2834 *match = 0; 2835 } 2836 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2837 if (f->child != NULL) { 2838 *rs = &f->child->ruleset; 2839 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2840 if (*r == NULL) 2841 continue; 2842 else 2843 break; 2844 } 2845 } 2846 (*depth)--; 2847 if (*depth == 0 && a != NULL) 2848 *a = NULL; 2849 *rs = f->rs; 2850 if (f->r->anchor->match || (match != NULL && *match)) 2851 quick = f->r->quick; 2852 *r = TAILQ_NEXT(f->r, entries); 2853 } while (*r == NULL); 2854 2855 return (quick); 2856} 2857 2858#ifdef INET6 2859void 2860pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2861 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2862{ 2863 switch (af) { 2864#ifdef INET 2865 case AF_INET: 2866 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2867 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2868 break; 2869#endif /* INET */ 2870 case AF_INET6: 2871 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2872 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2873 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2874 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2875 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2876 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2877 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2878 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2879 break; 2880 } 2881} 2882 2883void 2884pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2885{ 2886 switch (af) { 2887#ifdef INET 2888 case AF_INET: 2889 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2890 break; 2891#endif /* INET */ 2892 case AF_INET6: 2893 if (addr->addr32[3] == 0xffffffff) { 2894 addr->addr32[3] = 0; 2895 if (addr->addr32[2] == 0xffffffff) { 2896 addr->addr32[2] = 0; 2897 if (addr->addr32[1] == 0xffffffff) { 2898 addr->addr32[1] = 0; 2899 addr->addr32[0] = 2900 htonl(ntohl(addr->addr32[0]) + 1); 2901 } else 2902 addr->addr32[1] = 2903 htonl(ntohl(addr->addr32[1]) + 1); 2904 } else 2905 addr->addr32[2] = 2906 htonl(ntohl(addr->addr32[2]) + 1); 2907 } else 2908 addr->addr32[3] = 2909 htonl(ntohl(addr->addr32[3]) + 1); 2910 break; 2911 } 2912} 2913#endif /* INET6 */ 2914 2915int 2916#ifdef __FreeBSD__ 2917pf_socket_lookup(int direction, struct pf_pdesc *pd, struct inpcb *inp_arg) 2918#else 2919pf_socket_lookup(int direction, struct pf_pdesc *pd) 2920#endif 2921{ 2922 struct pf_addr *saddr, *daddr; 2923 u_int16_t sport, dport; 2924#ifdef __FreeBSD__ 2925 struct inpcbinfo *pi; 2926#else 2927 struct inpcbtable *tb; 2928#endif 2929 struct inpcb *inp; 2930 2931 if (pd == NULL) 2932 return (-1); 2933 pd->lookup.uid = UID_MAX; 2934 pd->lookup.gid = GID_MAX; 2935 pd->lookup.pid = NO_PID; 2936 2937#ifdef __FreeBSD__ 2938 if (inp_arg != NULL) { 2939 INP_LOCK_ASSERT(inp_arg); 2940 pd->lookup.uid = inp_arg->inp_cred->cr_uid; 2941 pd->lookup.gid = inp_arg->inp_cred->cr_groups[0]; 2942 return (1); 2943 } 2944#endif 2945 2946 switch (pd->proto) { 2947 case IPPROTO_TCP: 2948 if (pd->hdr.tcp == NULL) 2949 return (-1); 2950 sport = pd->hdr.tcp->th_sport; 2951 dport = pd->hdr.tcp->th_dport; 2952#ifdef __FreeBSD__ 2953 pi = &V_tcbinfo; 2954#else 2955 tb = &tcbtable; 2956#endif 2957 break; 2958 case IPPROTO_UDP: 2959 if (pd->hdr.udp == NULL) 2960 return (-1); 2961 sport = pd->hdr.udp->uh_sport; 2962 dport = pd->hdr.udp->uh_dport; 2963#ifdef __FreeBSD__ 2964 pi = &V_udbinfo; 2965#else 2966 tb = &udbtable; 2967#endif 2968 break; 2969 default: 2970 return (-1); 2971 } 2972 if (direction == PF_IN) { 2973 saddr = pd->src; 2974 daddr = pd->dst; 2975 } else { 2976 u_int16_t p; 2977 2978 p = sport; 2979 sport = dport; 2980 dport = p; 2981 saddr = pd->dst; 2982 daddr = pd->src; 2983 } 2984 switch (pd->af) { 2985#ifdef INET 2986 case AF_INET: 2987#ifdef __FreeBSD__ 2988 /* 2989 * XXXRW: would be nice if we had an mbuf here so that we 2990 * could use in_pcblookup_mbuf(). 2991 */ 2992 inp = in_pcblookup(pi, saddr->v4, sport, daddr->v4, 2993 dport, INPLOOKUP_RLOCKPCB, NULL); 2994 if (inp == NULL) { 2995 inp = in_pcblookup(pi, saddr->v4, sport, 2996 daddr->v4, dport, INPLOOKUP_WILDCARD | 2997 INPLOOKUP_RLOCKPCB, NULL); 2998 if (inp == NULL) 2999 return (-1); 3000 } 3001#else 3002 inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 3003 if (inp == NULL) { 3004 inp = in_pcblookup_listen(tb, daddr->v4, dport, 0, 3005 NULL); 3006 if (inp == NULL) 3007 return (-1); 3008 } 3009#endif 3010 break; 3011#endif /* INET */ 3012#ifdef INET6 3013 case AF_INET6: 3014#ifdef __FreeBSD__ 3015 /* 3016 * XXXRW: would be nice if we had an mbuf here so that we 3017 * could use in6_pcblookup_mbuf(). 3018 */ 3019 inp = in6_pcblookup(pi, &saddr->v6, sport, 3020 &daddr->v6, dport, INPLOOKUP_RLOCKPCB, NULL); 3021 if (inp == NULL) { 3022 inp = in6_pcblookup(pi, &saddr->v6, sport, 3023 &daddr->v6, dport, INPLOOKUP_WILDCARD | 3024 INPLOOKUP_RLOCKPCB, NULL); 3025 if (inp == NULL) 3026 return (-1); 3027 } 3028#else 3029 inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 3030 dport); 3031 if (inp == NULL) { 3032 inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0, 3033 NULL); 3034 if (inp == NULL) 3035 return (-1); 3036 } 3037#endif 3038 break; 3039#endif /* INET6 */ 3040 3041 default: 3042 return (-1); 3043 } 3044#ifdef __FreeBSD__ 3045 INP_RLOCK_ASSERT(inp); 3046 pd->lookup.uid = inp->inp_cred->cr_uid; 3047 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3048 INP_RUNLOCK(inp); 3049#else 3050 pd->lookup.uid = inp->inp_socket->so_euid; 3051 pd->lookup.gid = inp->inp_socket->so_egid; 3052 pd->lookup.pid = inp->inp_socket->so_cpid; 3053#endif 3054 return (1); 3055} 3056 3057u_int8_t 3058pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3059{ 3060 int hlen; 3061 u_int8_t hdr[60]; 3062 u_int8_t *opt, optlen; 3063 u_int8_t wscale = 0; 3064 3065 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3066 if (hlen <= sizeof(struct tcphdr)) 3067 return (0); 3068 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3069 return (0); 3070 opt = hdr + sizeof(struct tcphdr); 3071 hlen -= sizeof(struct tcphdr); 3072 while (hlen >= 3) { 3073 switch (*opt) { 3074 case TCPOPT_EOL: 3075 case TCPOPT_NOP: 3076 ++opt; 3077 --hlen; 3078 break; 3079 case TCPOPT_WINDOW: 3080 wscale = opt[2]; 3081 if (wscale > TCP_MAX_WINSHIFT) 3082 wscale = TCP_MAX_WINSHIFT; 3083 wscale |= PF_WSCALE_FLAG; 3084 /* FALLTHROUGH */ 3085 default: 3086 optlen = opt[1]; 3087 if (optlen < 2) 3088 optlen = 2; 3089 hlen -= optlen; 3090 opt += optlen; 3091 break; 3092 } 3093 } 3094 return (wscale); 3095} 3096 3097u_int16_t 3098pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3099{ 3100 int hlen; 3101 u_int8_t hdr[60]; 3102 u_int8_t *opt, optlen; 3103#ifdef __FreeBSD__ 3104 u_int16_t mss = V_tcp_mssdflt; 3105#else 3106 u_int16_t mss = tcp_mssdflt; 3107#endif 3108 3109 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3110 if (hlen <= sizeof(struct tcphdr)) 3111 return (0); 3112 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3113 return (0); 3114 opt = hdr + sizeof(struct tcphdr); 3115 hlen -= sizeof(struct tcphdr); 3116 while (hlen >= TCPOLEN_MAXSEG) { 3117 switch (*opt) { 3118 case TCPOPT_EOL: 3119 case TCPOPT_NOP: 3120 ++opt; 3121 --hlen; 3122 break; 3123 case TCPOPT_MAXSEG: 3124 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3125 NTOHS(mss); 3126 /* FALLTHROUGH */ 3127 default: 3128 optlen = opt[1]; 3129 if (optlen < 2) 3130 optlen = 2; 3131 hlen -= optlen; 3132 opt += optlen; 3133 break; 3134 } 3135 } 3136 return (mss); 3137} 3138 3139u_int16_t 3140pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 3141{ 3142#ifdef INET 3143 struct sockaddr_in *dst; 3144 struct route ro; 3145#endif /* INET */ 3146#ifdef INET6 3147 struct sockaddr_in6 *dst6; 3148 struct route_in6 ro6; 3149#endif /* INET6 */ 3150 struct rtentry *rt = NULL; 3151#ifdef __FreeBSD__ 3152 int hlen = 0; 3153 u_int16_t mss = V_tcp_mssdflt; 3154#else 3155 int hlen; 3156 u_int16_t mss = tcp_mssdflt; 3157#endif 3158 3159 switch (af) { 3160#ifdef INET 3161 case AF_INET: 3162 hlen = sizeof(struct ip); 3163 bzero(&ro, sizeof(ro)); 3164 dst = (struct sockaddr_in *)&ro.ro_dst; 3165 dst->sin_family = AF_INET; 3166 dst->sin_len = sizeof(*dst); 3167 dst->sin_addr = addr->v4; 3168#ifdef __FreeBSD__ 3169 in_rtalloc_ign(&ro, 0, rtableid); 3170#else /* ! __FreeBSD__ */ 3171 rtalloc_noclone(&ro, NO_CLONING); 3172#endif 3173 rt = ro.ro_rt; 3174 break; 3175#endif /* INET */ 3176#ifdef INET6 3177 case AF_INET6: 3178 hlen = sizeof(struct ip6_hdr); 3179 bzero(&ro6, sizeof(ro6)); 3180 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3181 dst6->sin6_family = AF_INET6; 3182 dst6->sin6_len = sizeof(*dst6); 3183 dst6->sin6_addr = addr->v6; 3184#ifdef __FreeBSD__ 3185 in6_rtalloc_ign(&ro6, 0, rtableid); 3186#else /* ! __FreeBSD__ */ 3187 rtalloc_noclone((struct route *)&ro6, NO_CLONING); 3188#endif 3189 rt = ro6.ro_rt; 3190 break; 3191#endif /* INET6 */ 3192 } 3193 3194 if (rt && rt->rt_ifp) { 3195 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3196#ifdef __FreeBSD__ 3197 mss = max(V_tcp_mssdflt, mss); 3198#else 3199 mss = max(tcp_mssdflt, mss); 3200#endif 3201 RTFREE(rt); 3202 } 3203 mss = min(mss, offer); 3204 mss = max(mss, 64); /* sanity - at least max opt space */ 3205 return (mss); 3206} 3207 3208void 3209pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3210{ 3211 struct pf_rule *r = s->rule.ptr; 3212 struct pf_src_node *sn = NULL; 3213 3214 s->rt_kif = NULL; 3215 if (!r->rt || r->rt == PF_FASTROUTE) 3216 return; 3217 switch (s->key[PF_SK_WIRE]->af) { 3218#ifdef INET 3219 case AF_INET: 3220 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, &sn); 3221 s->rt_kif = r->rpool.cur->kif; 3222 break; 3223#endif /* INET */ 3224#ifdef INET6 3225 case AF_INET6: 3226 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, &sn); 3227 s->rt_kif = r->rpool.cur->kif; 3228 break; 3229#endif /* INET6 */ 3230 } 3231} 3232 3233u_int32_t 3234pf_tcp_iss(struct pf_pdesc *pd) 3235{ 3236 MD5_CTX ctx; 3237 u_int32_t digest[4]; 3238 3239#ifdef __FreeBSD__ 3240 if (V_pf_tcp_secret_init == 0) { 3241 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 3242 MD5Init(&V_pf_tcp_secret_ctx); 3243 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 3244 sizeof(V_pf_tcp_secret)); 3245 V_pf_tcp_secret_init = 1; 3246 } 3247 3248 ctx = V_pf_tcp_secret_ctx; 3249#else 3250 if (pf_tcp_secret_init == 0) { 3251 arc4random_buf(pf_tcp_secret, sizeof(pf_tcp_secret)); 3252 MD5Init(&pf_tcp_secret_ctx); 3253 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret, 3254 sizeof(pf_tcp_secret)); 3255 pf_tcp_secret_init = 1; 3256 } 3257 3258 ctx = pf_tcp_secret_ctx; 3259#endif 3260 3261 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3262 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3263 if (pd->af == AF_INET6) { 3264 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3265 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3266 } else { 3267 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3268 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3269 } 3270 MD5Final((u_char *)digest, &ctx); 3271#ifdef __FreeBSD__ 3272 V_pf_tcp_iss_off += 4096; 3273#define ISN_RANDOM_INCREMENT (4096 - 1) 3274 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 3275 V_pf_tcp_iss_off); 3276#undef ISN_RANDOM_INCREMENT 3277#else 3278 pf_tcp_iss_off += 4096; 3279 return (digest[0] + tcp_iss + pf_tcp_iss_off); 3280#endif 3281} 3282 3283int 3284pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3285 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3286 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3287#ifdef __FreeBSD__ 3288 struct ifqueue *ifq, struct inpcb *inp) 3289#else 3290 struct ifqueue *ifq) 3291#endif 3292{ 3293 struct pf_rule *nr = NULL; 3294 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3295 sa_family_t af = pd->af; 3296 struct pf_rule *r, *a = NULL; 3297 struct pf_ruleset *ruleset = NULL; 3298 struct pf_src_node *nsn = NULL; 3299 struct tcphdr *th = pd->hdr.tcp; 3300 struct pf_state_key *skw = NULL, *sks = NULL; 3301 struct pf_state_key *sk = NULL, *nk = NULL; 3302 u_short reason; 3303 int rewrite = 0, hdrlen = 0; 3304 int tag = -1, rtableid = -1; 3305 int asd = 0; 3306 int match = 0; 3307 int state_icmp = 0; 3308#ifdef __FreeBSD__ 3309 u_int16_t sport = 0, dport = 0; 3310 u_int16_t bproto_sum = 0, bip_sum = 0; 3311#else 3312 u_int16_t sport, dport; 3313 u_int16_t bproto_sum = 0, bip_sum; 3314#endif 3315 u_int8_t icmptype = 0, icmpcode = 0; 3316 3317 3318 if (direction == PF_IN && pf_check_congestion(ifq)) { 3319 REASON_SET(&reason, PFRES_CONGEST); 3320 return (PF_DROP); 3321 } 3322 3323#ifdef __FreeBSD__ 3324 if (inp != NULL) 3325 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3326 else if (V_debug_pfugidhack) { 3327 PF_UNLOCK(); 3328 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3329 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3330 PF_LOCK(); 3331 } 3332#endif 3333 3334 switch (pd->proto) { 3335 case IPPROTO_TCP: 3336 sport = th->th_sport; 3337 dport = th->th_dport; 3338 hdrlen = sizeof(*th); 3339 break; 3340 case IPPROTO_UDP: 3341 sport = pd->hdr.udp->uh_sport; 3342 dport = pd->hdr.udp->uh_dport; 3343 hdrlen = sizeof(*pd->hdr.udp); 3344 break; 3345#ifdef INET 3346 case IPPROTO_ICMP: 3347 if (pd->af != AF_INET) 3348 break; 3349 sport = dport = pd->hdr.icmp->icmp_id; 3350 hdrlen = sizeof(*pd->hdr.icmp); 3351 icmptype = pd->hdr.icmp->icmp_type; 3352 icmpcode = pd->hdr.icmp->icmp_code; 3353 3354 if (icmptype == ICMP_UNREACH || 3355 icmptype == ICMP_SOURCEQUENCH || 3356 icmptype == ICMP_REDIRECT || 3357 icmptype == ICMP_TIMXCEED || 3358 icmptype == ICMP_PARAMPROB) 3359 state_icmp++; 3360 break; 3361#endif /* INET */ 3362#ifdef INET6 3363 case IPPROTO_ICMPV6: 3364 if (af != AF_INET6) 3365 break; 3366 sport = dport = pd->hdr.icmp6->icmp6_id; 3367 hdrlen = sizeof(*pd->hdr.icmp6); 3368 icmptype = pd->hdr.icmp6->icmp6_type; 3369 icmpcode = pd->hdr.icmp6->icmp6_code; 3370 3371 if (icmptype == ICMP6_DST_UNREACH || 3372 icmptype == ICMP6_PACKET_TOO_BIG || 3373 icmptype == ICMP6_TIME_EXCEEDED || 3374 icmptype == ICMP6_PARAM_PROB) 3375 state_icmp++; 3376 break; 3377#endif /* INET6 */ 3378 default: 3379 sport = dport = hdrlen = 0; 3380 break; 3381 } 3382 3383 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3384 3385 /* check packet for BINAT/NAT/RDR */ 3386 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, 3387 &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) { 3388 if (nk == NULL || sk == NULL) { 3389 REASON_SET(&reason, PFRES_MEMORY); 3390 goto cleanup; 3391 } 3392 3393 if (pd->ip_sum) 3394 bip_sum = *pd->ip_sum; 3395 3396 switch (pd->proto) { 3397 case IPPROTO_TCP: 3398 bproto_sum = th->th_sum; 3399 pd->proto_sum = &th->th_sum; 3400 3401 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3402 nk->port[pd->sidx] != sport) { 3403 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3404 &th->th_sum, &nk->addr[pd->sidx], 3405 nk->port[pd->sidx], 0, af); 3406 pd->sport = &th->th_sport; 3407 sport = th->th_sport; 3408 } 3409 3410 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3411 nk->port[pd->didx] != dport) { 3412 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3413 &th->th_sum, &nk->addr[pd->didx], 3414 nk->port[pd->didx], 0, af); 3415 dport = th->th_dport; 3416 pd->dport = &th->th_dport; 3417 } 3418 rewrite++; 3419 break; 3420 case IPPROTO_UDP: 3421 bproto_sum = pd->hdr.udp->uh_sum; 3422 pd->proto_sum = &pd->hdr.udp->uh_sum; 3423 3424 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3425 nk->port[pd->sidx] != sport) { 3426 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3427 pd->ip_sum, &pd->hdr.udp->uh_sum, 3428 &nk->addr[pd->sidx], 3429 nk->port[pd->sidx], 1, af); 3430 sport = pd->hdr.udp->uh_sport; 3431 pd->sport = &pd->hdr.udp->uh_sport; 3432 } 3433 3434 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3435 nk->port[pd->didx] != dport) { 3436 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3437 pd->ip_sum, &pd->hdr.udp->uh_sum, 3438 &nk->addr[pd->didx], 3439 nk->port[pd->didx], 1, af); 3440 dport = pd->hdr.udp->uh_dport; 3441 pd->dport = &pd->hdr.udp->uh_dport; 3442 } 3443 rewrite++; 3444 break; 3445#ifdef INET 3446 case IPPROTO_ICMP: 3447 nk->port[0] = nk->port[1]; 3448 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3449 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3450 nk->addr[pd->sidx].v4.s_addr, 0); 3451 3452 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3453 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3454 nk->addr[pd->didx].v4.s_addr, 0); 3455 3456 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3457 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3458 pd->hdr.icmp->icmp_cksum, sport, 3459 nk->port[1], 0); 3460 pd->hdr.icmp->icmp_id = nk->port[1]; 3461 pd->sport = &pd->hdr.icmp->icmp_id; 3462 } 3463 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3464 break; 3465#endif /* INET */ 3466#ifdef INET6 3467 case IPPROTO_ICMPV6: 3468 nk->port[0] = nk->port[1]; 3469 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3470 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3471 &nk->addr[pd->sidx], 0); 3472 3473 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3474 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3475 &nk->addr[pd->didx], 0); 3476 rewrite++; 3477 break; 3478#endif /* INET */ 3479 default: 3480 switch (af) { 3481#ifdef INET 3482 case AF_INET: 3483 if (PF_ANEQ(saddr, 3484 &nk->addr[pd->sidx], AF_INET)) 3485 pf_change_a(&saddr->v4.s_addr, 3486 pd->ip_sum, 3487 nk->addr[pd->sidx].v4.s_addr, 0); 3488 3489 if (PF_ANEQ(daddr, 3490 &nk->addr[pd->didx], AF_INET)) 3491 pf_change_a(&daddr->v4.s_addr, 3492 pd->ip_sum, 3493 nk->addr[pd->didx].v4.s_addr, 0); 3494 break; 3495#endif /* INET */ 3496#ifdef INET6 3497 case AF_INET6: 3498 if (PF_ANEQ(saddr, 3499 &nk->addr[pd->sidx], AF_INET6)) 3500 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3501 3502 if (PF_ANEQ(daddr, 3503 &nk->addr[pd->didx], AF_INET6)) 3504 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3505 break; 3506#endif /* INET */ 3507 } 3508 break; 3509 } 3510 if (nr->natpass) 3511 r = NULL; 3512 pd->nat_rule = nr; 3513 } 3514 3515 while (r != NULL) { 3516 r->evaluations++; 3517 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3518 r = r->skip[PF_SKIP_IFP].ptr; 3519 else if (r->direction && r->direction != direction) 3520 r = r->skip[PF_SKIP_DIR].ptr; 3521 else if (r->af && r->af != af) 3522 r = r->skip[PF_SKIP_AF].ptr; 3523 else if (r->proto && r->proto != pd->proto) 3524 r = r->skip[PF_SKIP_PROTO].ptr; 3525 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3526 r->src.neg, kif, M_GETFIB(m))) 3527 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3528 /* tcp/udp only. port_op always 0 in other cases */ 3529 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3530 r->src.port[0], r->src.port[1], sport)) 3531 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3532 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3533 r->dst.neg, NULL, M_GETFIB(m))) 3534 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3535 /* tcp/udp only. port_op always 0 in other cases */ 3536 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3537 r->dst.port[0], r->dst.port[1], dport)) 3538 r = r->skip[PF_SKIP_DST_PORT].ptr; 3539 /* icmp only. type always 0 in other cases */ 3540 else if (r->type && r->type != icmptype + 1) 3541 r = TAILQ_NEXT(r, entries); 3542 /* icmp only. type always 0 in other cases */ 3543 else if (r->code && r->code != icmpcode + 1) 3544 r = TAILQ_NEXT(r, entries); 3545 else if (r->tos && !(r->tos == pd->tos)) 3546 r = TAILQ_NEXT(r, entries); 3547 else if (r->rule_flag & PFRULE_FRAGMENT) 3548 r = TAILQ_NEXT(r, entries); 3549 else if (pd->proto == IPPROTO_TCP && 3550 (r->flagset & th->th_flags) != r->flags) 3551 r = TAILQ_NEXT(r, entries); 3552 /* tcp/udp only. uid.op always 0 in other cases */ 3553 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3554#ifdef __FreeBSD__ 3555 pf_socket_lookup(direction, pd, inp), 1)) && 3556#else 3557 pf_socket_lookup(direction, pd), 1)) && 3558#endif 3559 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3560 pd->lookup.uid)) 3561 r = TAILQ_NEXT(r, entries); 3562 /* tcp/udp only. gid.op always 0 in other cases */ 3563 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3564#ifdef __FreeBSD__ 3565 pf_socket_lookup(direction, pd, inp), 1)) && 3566#else 3567 pf_socket_lookup(direction, pd), 1)) && 3568#endif 3569 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3570 pd->lookup.gid)) 3571 r = TAILQ_NEXT(r, entries); 3572 else if (r->prob && 3573#ifdef __FreeBSD__ 3574 r->prob <= arc4random()) 3575#else 3576 r->prob <= arc4random_uniform(UINT_MAX - 1) + 1) 3577#endif 3578 r = TAILQ_NEXT(r, entries); 3579#ifdef __FreeBSD__ 3580 else if (r->match_tag && !pf_match_tag(m, r, &tag, pd->pf_mtag)) 3581#else 3582 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3583#endif 3584 r = TAILQ_NEXT(r, entries); 3585 else if (r->os_fingerprint != PF_OSFP_ANY && 3586 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3587 pf_osfp_fingerprint(pd, m, off, th), 3588 r->os_fingerprint))) 3589 r = TAILQ_NEXT(r, entries); 3590 else { 3591 if (r->tag) 3592 tag = r->tag; 3593 if (r->rtableid >= 0) 3594 rtableid = r->rtableid; 3595 if (r->anchor == NULL) { 3596 match = 1; 3597 *rm = r; 3598 *am = a; 3599 *rsm = ruleset; 3600 if ((*rm)->quick) 3601 break; 3602 r = TAILQ_NEXT(r, entries); 3603 } else 3604 pf_step_into_anchor(&asd, &ruleset, 3605 PF_RULESET_FILTER, &r, &a, &match); 3606 } 3607 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3608 PF_RULESET_FILTER, &r, &a, &match)) 3609 break; 3610 } 3611 r = *rm; 3612 a = *am; 3613 ruleset = *rsm; 3614 3615 REASON_SET(&reason, PFRES_MATCH); 3616 3617 if (r->log || (nr != NULL && nr->log)) { 3618 if (rewrite) 3619 m_copyback(m, off, hdrlen, pd->hdr.any); 3620 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3621 a, ruleset, pd); 3622 } 3623 3624 if ((r->action == PF_DROP) && 3625 ((r->rule_flag & PFRULE_RETURNRST) || 3626 (r->rule_flag & PFRULE_RETURNICMP) || 3627 (r->rule_flag & PFRULE_RETURN))) { 3628 /* undo NAT changes, if they have taken place */ 3629 if (nr != NULL) { 3630 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3631 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3632 if (pd->sport) 3633 *pd->sport = sk->port[pd->sidx]; 3634 if (pd->dport) 3635 *pd->dport = sk->port[pd->didx]; 3636 if (pd->proto_sum) 3637 *pd->proto_sum = bproto_sum; 3638 if (pd->ip_sum) 3639 *pd->ip_sum = bip_sum; 3640 m_copyback(m, off, hdrlen, pd->hdr.any); 3641 } 3642 if (pd->proto == IPPROTO_TCP && 3643 ((r->rule_flag & PFRULE_RETURNRST) || 3644 (r->rule_flag & PFRULE_RETURN)) && 3645 !(th->th_flags & TH_RST)) { 3646 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3647 int len = 0; 3648#ifdef INET 3649 struct ip *h4; 3650#endif 3651#ifdef INET6 3652 struct ip6_hdr *h6; 3653#endif 3654 3655 switch (af) { 3656#ifdef INET 3657 case AF_INET: 3658 h4 = mtod(m, struct ip *); 3659 len = ntohs(h4->ip_len) - off; 3660 break; 3661#endif 3662#ifdef INET6 3663 case AF_INET6: 3664 h6 = mtod(m, struct ip6_hdr *); 3665 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3666 break; 3667#endif 3668 } 3669 3670 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3671 REASON_SET(&reason, PFRES_PROTCKSUM); 3672 else { 3673 if (th->th_flags & TH_SYN) 3674 ack++; 3675 if (th->th_flags & TH_FIN) 3676 ack++; 3677#ifdef __FreeBSD__ 3678 pf_send_tcp(m, r, af, pd->dst, 3679#else 3680 pf_send_tcp(r, af, pd->dst, 3681#endif 3682 pd->src, th->th_dport, th->th_sport, 3683 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3684 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3685 } 3686 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3687 r->return_icmp) 3688 pf_send_icmp(m, r->return_icmp >> 8, 3689 r->return_icmp & 255, af, r); 3690 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3691 r->return_icmp6) 3692 pf_send_icmp(m, r->return_icmp6 >> 8, 3693 r->return_icmp6 & 255, af, r); 3694 } 3695 3696 if (r->action == PF_DROP) 3697 goto cleanup; 3698 3699#ifdef __FreeBSD__ 3700 if (pf_tag_packet(m, tag, rtableid, pd->pf_mtag)) { 3701#else 3702 if (pf_tag_packet(m, tag, rtableid)) { 3703#endif 3704 REASON_SET(&reason, PFRES_MEMORY); 3705 goto cleanup; 3706 } 3707 3708 if (!state_icmp && (r->keep_state || nr != NULL || 3709 (pd->flags & PFDESC_TCP_NORM))) { 3710 int action; 3711 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m, 3712 off, sport, dport, &rewrite, kif, sm, tag, bproto_sum, 3713 bip_sum, hdrlen); 3714 if (action != PF_PASS) 3715 return (action); 3716 } else { 3717#ifdef __FreeBSD__ 3718 if (sk != NULL) 3719 pool_put(&V_pf_state_key_pl, sk); 3720 if (nk != NULL) 3721 pool_put(&V_pf_state_key_pl, nk); 3722#else 3723 if (sk != NULL) 3724 pool_put(&pf_state_key_pl, sk); 3725 if (nk != NULL) 3726 pool_put(&pf_state_key_pl, nk); 3727#endif 3728 } 3729 3730 /* copy back packet headers if we performed NAT operations */ 3731 if (rewrite) 3732 m_copyback(m, off, hdrlen, pd->hdr.any); 3733 3734#if NPFSYNC > 0 3735 if (*sm != NULL && !ISSET((*sm)->state_flags, PFSTATE_NOSYNC) && 3736#ifdef __FreeBSD__ 3737 direction == PF_OUT && pfsync_up_ptr != NULL && pfsync_up_ptr()) { 3738#else 3739 direction == PF_OUT && pfsync_up()) { 3740#endif 3741 /* 3742 * We want the state created, but we dont 3743 * want to send this in case a partner 3744 * firewall has to know about it to allow 3745 * replies through it. 3746 */ 3747#ifdef __FreeBSD__ 3748 if (pfsync_defer_ptr != NULL && 3749 pfsync_defer_ptr(*sm, m)) 3750#else 3751 if (pfsync_defer(*sm, m)) 3752#endif 3753 return (PF_DEFER); 3754 } 3755#endif 3756 3757 return (PF_PASS); 3758 3759cleanup: 3760#ifdef __FreeBSD__ 3761 if (sk != NULL) 3762 pool_put(&V_pf_state_key_pl, sk); 3763 if (nk != NULL) 3764 pool_put(&V_pf_state_key_pl, nk); 3765#else 3766 if (sk != NULL) 3767 pool_put(&pf_state_key_pl, sk); 3768 if (nk != NULL) 3769 pool_put(&pf_state_key_pl, nk); 3770#endif 3771 return (PF_DROP); 3772} 3773 3774static __inline int 3775pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3776 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw, 3777 struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk, 3778 struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite, 3779 struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum, 3780 u_int16_t bip_sum, int hdrlen) 3781{ 3782 struct pf_state *s = NULL; 3783 struct pf_src_node *sn = NULL; 3784 struct tcphdr *th = pd->hdr.tcp; 3785#ifdef __FreeBSD__ 3786 u_int16_t mss = V_tcp_mssdflt; 3787#else 3788 u_int16_t mss = tcp_mssdflt; 3789#endif 3790 u_short reason; 3791 3792 /* check maximums */ 3793 if (r->max_states && (r->states_cur >= r->max_states)) { 3794#ifdef __FreeBSD__ 3795 V_pf_status.lcounters[LCNT_STATES]++; 3796#else 3797 pf_status.lcounters[LCNT_STATES]++; 3798#endif 3799 REASON_SET(&reason, PFRES_MAXSTATES); 3800 return (PF_DROP); 3801 } 3802 /* src node for filter rule */ 3803 if ((r->rule_flag & PFRULE_SRCTRACK || 3804 r->rpool.opts & PF_POOL_STICKYADDR) && 3805 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3806 REASON_SET(&reason, PFRES_SRCLIMIT); 3807 goto csfailed; 3808 } 3809 /* src node for translation rule */ 3810 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3811 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3812 REASON_SET(&reason, PFRES_SRCLIMIT); 3813 goto csfailed; 3814 } 3815#ifdef __FreeBSD__ 3816 s = pool_get(&V_pf_state_pl, PR_NOWAIT | PR_ZERO); 3817#else 3818 s = pool_get(&pf_state_pl, PR_NOWAIT | PR_ZERO); 3819#endif 3820 if (s == NULL) { 3821 REASON_SET(&reason, PFRES_MEMORY); 3822 goto csfailed; 3823 } 3824 s->rule.ptr = r; 3825 s->nat_rule.ptr = nr; 3826 s->anchor.ptr = a; 3827 STATE_INC_COUNTERS(s); 3828 if (r->allow_opts) 3829 s->state_flags |= PFSTATE_ALLOWOPTS; 3830 if (r->rule_flag & PFRULE_STATESLOPPY) 3831 s->state_flags |= PFSTATE_SLOPPY; 3832 if (r->rule_flag & PFRULE_PFLOW) 3833 s->state_flags |= PFSTATE_PFLOW; 3834 s->log = r->log & PF_LOG_ALL; 3835 s->sync_state = PFSYNC_S_NONE; 3836 if (nr != NULL) 3837 s->log |= nr->log & PF_LOG_ALL; 3838 switch (pd->proto) { 3839 case IPPROTO_TCP: 3840 s->src.seqlo = ntohl(th->th_seq); 3841 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3842 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3843 r->keep_state == PF_STATE_MODULATE) { 3844 /* Generate sequence number modulator */ 3845 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3846 0) 3847 s->src.seqdiff = 1; 3848 pf_change_a(&th->th_seq, &th->th_sum, 3849 htonl(s->src.seqlo + s->src.seqdiff), 0); 3850 *rewrite = 1; 3851 } else 3852 s->src.seqdiff = 0; 3853 if (th->th_flags & TH_SYN) { 3854 s->src.seqhi++; 3855 s->src.wscale = pf_get_wscale(m, off, 3856 th->th_off, pd->af); 3857 } 3858 s->src.max_win = MAX(ntohs(th->th_win), 1); 3859 if (s->src.wscale & PF_WSCALE_MASK) { 3860 /* Remove scale factor from initial window */ 3861 int win = s->src.max_win; 3862 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3863 s->src.max_win = (win - 1) >> 3864 (s->src.wscale & PF_WSCALE_MASK); 3865 } 3866 if (th->th_flags & TH_FIN) 3867 s->src.seqhi++; 3868 s->dst.seqhi = 1; 3869 s->dst.max_win = 1; 3870 s->src.state = TCPS_SYN_SENT; 3871 s->dst.state = TCPS_CLOSED; 3872 s->timeout = PFTM_TCP_FIRST_PACKET; 3873 break; 3874 case IPPROTO_UDP: 3875 s->src.state = PFUDPS_SINGLE; 3876 s->dst.state = PFUDPS_NO_TRAFFIC; 3877 s->timeout = PFTM_UDP_FIRST_PACKET; 3878 break; 3879 case IPPROTO_ICMP: 3880#ifdef INET6 3881 case IPPROTO_ICMPV6: 3882#endif 3883 s->timeout = PFTM_ICMP_FIRST_PACKET; 3884 break; 3885 default: 3886 s->src.state = PFOTHERS_SINGLE; 3887 s->dst.state = PFOTHERS_NO_TRAFFIC; 3888 s->timeout = PFTM_OTHER_FIRST_PACKET; 3889 } 3890 3891 s->creation = time_second; 3892 s->expire = time_second; 3893 3894 if (sn != NULL) { 3895 s->src_node = sn; 3896 s->src_node->states++; 3897 } 3898 if (nsn != NULL) { 3899 /* XXX We only modify one side for now. */ 3900 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3901 s->nat_src_node = nsn; 3902 s->nat_src_node->states++; 3903 } 3904 if (pd->proto == IPPROTO_TCP) { 3905 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3906 off, pd, th, &s->src, &s->dst)) { 3907 REASON_SET(&reason, PFRES_MEMORY); 3908 pf_src_tree_remove_state(s); 3909 STATE_DEC_COUNTERS(s); 3910#ifdef __FreeBSD__ 3911 pool_put(&V_pf_state_pl, s); 3912#else 3913 pool_put(&pf_state_pl, s); 3914#endif 3915 return (PF_DROP); 3916 } 3917 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3918 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3919 &s->src, &s->dst, rewrite)) { 3920 /* This really shouldn't happen!!! */ 3921 DPFPRINTF(PF_DEBUG_URGENT, 3922 ("pf_normalize_tcp_stateful failed on first pkt")); 3923 pf_normalize_tcp_cleanup(s); 3924 pf_src_tree_remove_state(s); 3925 STATE_DEC_COUNTERS(s); 3926#ifdef __FreeBSD__ 3927 pool_put(&V_pf_state_pl, s); 3928#else 3929 pool_put(&pf_state_pl, s); 3930#endif 3931 return (PF_DROP); 3932 } 3933 } 3934 s->direction = pd->dir; 3935 3936 if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk, 3937 pd->src, pd->dst, sport, dport)) 3938 goto csfailed; 3939 3940 if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) { 3941 if (pd->proto == IPPROTO_TCP) 3942 pf_normalize_tcp_cleanup(s); 3943 REASON_SET(&reason, PFRES_STATEINS); 3944 pf_src_tree_remove_state(s); 3945 STATE_DEC_COUNTERS(s); 3946#ifdef __FreeBSD__ 3947 pool_put(&V_pf_state_pl, s); 3948#else 3949 pool_put(&pf_state_pl, s); 3950#endif 3951 return (PF_DROP); 3952 } else 3953 *sm = s; 3954 3955 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 3956 if (tag > 0) { 3957 pf_tag_ref(tag); 3958 s->tag = tag; 3959 } 3960 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3961 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3962 s->src.state = PF_TCPS_PROXY_SRC; 3963 /* undo NAT changes, if they have taken place */ 3964 if (nr != NULL) { 3965 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3966 if (pd->dir == PF_OUT) 3967 skt = s->key[PF_SK_STACK]; 3968 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3969 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3970 if (pd->sport) 3971 *pd->sport = skt->port[pd->sidx]; 3972 if (pd->dport) 3973 *pd->dport = skt->port[pd->didx]; 3974 if (pd->proto_sum) 3975 *pd->proto_sum = bproto_sum; 3976 if (pd->ip_sum) 3977 *pd->ip_sum = bip_sum; 3978 m_copyback(m, off, hdrlen, pd->hdr.any); 3979 } 3980 s->src.seqhi = htonl(arc4random()); 3981 /* Find mss option */ 3982 int rtid = M_GETFIB(m); 3983 mss = pf_get_mss(m, off, th->th_off, pd->af); 3984 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3985 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3986 s->src.mss = mss; 3987#ifdef __FreeBSD__ 3988 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3989#else 3990 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 3991#endif 3992 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3993 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3994 REASON_SET(&reason, PFRES_SYNPROXY); 3995 return (PF_SYNPROXY_DROP); 3996 } 3997 3998 return (PF_PASS); 3999 4000csfailed: 4001#ifdef __FreeBSD__ 4002 if (sk != NULL) 4003 pool_put(&V_pf_state_key_pl, sk); 4004 if (nk != NULL) 4005 pool_put(&V_pf_state_key_pl, nk); 4006#else 4007 if (sk != NULL) 4008 pool_put(&pf_state_key_pl, sk); 4009 if (nk != NULL) 4010 pool_put(&pf_state_key_pl, nk); 4011#endif 4012 4013 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4014#ifdef __FreeBSD__ 4015 RB_REMOVE(pf_src_tree, &V_tree_src_tracking, sn); 4016 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4017 V_pf_status.src_nodes--; 4018 pool_put(&V_pf_src_tree_pl, sn); 4019#else 4020 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4021 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4022 pf_status.src_nodes--; 4023 pool_put(&pf_src_tree_pl, sn); 4024#endif 4025 } 4026 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 4027#ifdef __FreeBSD__ 4028 RB_REMOVE(pf_src_tree, &V_tree_src_tracking, nsn); 4029 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4030 V_pf_status.src_nodes--; 4031 pool_put(&V_pf_src_tree_pl, nsn); 4032#else 4033 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4034 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4035 pf_status.src_nodes--; 4036 pool_put(&pf_src_tree_pl, nsn); 4037#endif 4038 } 4039 return (PF_DROP); 4040} 4041 4042int 4043pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4044 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4045 struct pf_ruleset **rsm) 4046{ 4047 struct pf_rule *r, *a = NULL; 4048 struct pf_ruleset *ruleset = NULL; 4049 sa_family_t af = pd->af; 4050 u_short reason; 4051 int tag = -1; 4052 int asd = 0; 4053 int match = 0; 4054 4055 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4056 while (r != NULL) { 4057 r->evaluations++; 4058 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4059 r = r->skip[PF_SKIP_IFP].ptr; 4060 else if (r->direction && r->direction != direction) 4061 r = r->skip[PF_SKIP_DIR].ptr; 4062 else if (r->af && r->af != af) 4063 r = r->skip[PF_SKIP_AF].ptr; 4064 else if (r->proto && r->proto != pd->proto) 4065 r = r->skip[PF_SKIP_PROTO].ptr; 4066 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4067 r->src.neg, kif, M_GETFIB(m))) 4068 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4069 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4070 r->dst.neg, NULL, M_GETFIB(m))) 4071 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4072 else if (r->tos && !(r->tos == pd->tos)) 4073 r = TAILQ_NEXT(r, entries); 4074 else if (r->os_fingerprint != PF_OSFP_ANY) 4075 r = TAILQ_NEXT(r, entries); 4076 else if (pd->proto == IPPROTO_UDP && 4077 (r->src.port_op || r->dst.port_op)) 4078 r = TAILQ_NEXT(r, entries); 4079 else if (pd->proto == IPPROTO_TCP && 4080 (r->src.port_op || r->dst.port_op || r->flagset)) 4081 r = TAILQ_NEXT(r, entries); 4082 else if ((pd->proto == IPPROTO_ICMP || 4083 pd->proto == IPPROTO_ICMPV6) && 4084 (r->type || r->code)) 4085 r = TAILQ_NEXT(r, entries); 4086 else if (r->prob && r->prob <= 4087 (arc4random() % (UINT_MAX - 1) + 1)) 4088 r = TAILQ_NEXT(r, entries); 4089#ifdef __FreeBSD__ 4090 else if (r->match_tag && !pf_match_tag(m, r, &tag, pd->pf_mtag)) 4091#else 4092 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 4093#endif 4094 r = TAILQ_NEXT(r, entries); 4095 else { 4096 if (r->anchor == NULL) { 4097 match = 1; 4098 *rm = r; 4099 *am = a; 4100 *rsm = ruleset; 4101 if ((*rm)->quick) 4102 break; 4103 r = TAILQ_NEXT(r, entries); 4104 } else 4105 pf_step_into_anchor(&asd, &ruleset, 4106 PF_RULESET_FILTER, &r, &a, &match); 4107 } 4108 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4109 PF_RULESET_FILTER, &r, &a, &match)) 4110 break; 4111 } 4112 r = *rm; 4113 a = *am; 4114 ruleset = *rsm; 4115 4116 REASON_SET(&reason, PFRES_MATCH); 4117 4118 if (r->log) 4119 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 4120 pd); 4121 4122 if (r->action != PF_PASS) 4123 return (PF_DROP); 4124 4125#ifdef __FreeBSD__ 4126 if (pf_tag_packet(m, tag, -1, pd->pf_mtag)) { 4127#else 4128 if (pf_tag_packet(m, tag, -1)) { 4129#endif 4130 REASON_SET(&reason, PFRES_MEMORY); 4131 return (PF_DROP); 4132 } 4133 4134 return (PF_PASS); 4135} 4136 4137int 4138pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 4139 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 4140 struct pf_pdesc *pd, u_short *reason, int *copyback) 4141{ 4142 struct tcphdr *th = pd->hdr.tcp; 4143 u_int16_t win = ntohs(th->th_win); 4144 u_int32_t ack, end, seq, orig_seq; 4145 u_int8_t sws, dws; 4146 int ackskew; 4147 4148 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4149 sws = src->wscale & PF_WSCALE_MASK; 4150 dws = dst->wscale & PF_WSCALE_MASK; 4151 } else 4152 sws = dws = 0; 4153 4154 /* 4155 * Sequence tracking algorithm from Guido van Rooij's paper: 4156 * http://www.madison-gurkha.com/publications/tcp_filtering/ 4157 * tcp_filtering.ps 4158 */ 4159 4160 orig_seq = seq = ntohl(th->th_seq); 4161 if (src->seqlo == 0) { 4162 /* First packet from this end. Set its state */ 4163 4164 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4165 src->scrub == NULL) { 4166 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4167 REASON_SET(reason, PFRES_MEMORY); 4168 return (PF_DROP); 4169 } 4170 } 4171 4172 /* Deferred generation of sequence number modulator */ 4173 if (dst->seqdiff && !src->seqdiff) { 4174 /* use random iss for the TCP server */ 4175 while ((src->seqdiff = arc4random() - seq) == 0) 4176 ; 4177 ack = ntohl(th->th_ack) - dst->seqdiff; 4178 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4179 src->seqdiff), 0); 4180 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4181 *copyback = 1; 4182 } else { 4183 ack = ntohl(th->th_ack); 4184 } 4185 4186 end = seq + pd->p_len; 4187 if (th->th_flags & TH_SYN) { 4188 end++; 4189 if (dst->wscale & PF_WSCALE_FLAG) { 4190 src->wscale = pf_get_wscale(m, off, th->th_off, 4191 pd->af); 4192 if (src->wscale & PF_WSCALE_FLAG) { 4193 /* Remove scale factor from initial 4194 * window */ 4195 sws = src->wscale & PF_WSCALE_MASK; 4196 win = ((u_int32_t)win + (1 << sws) - 1) 4197 >> sws; 4198 dws = dst->wscale & PF_WSCALE_MASK; 4199 } else { 4200 /* fixup other window */ 4201 dst->max_win <<= dst->wscale & 4202 PF_WSCALE_MASK; 4203 /* in case of a retrans SYN|ACK */ 4204 dst->wscale = 0; 4205 } 4206 } 4207 } 4208 if (th->th_flags & TH_FIN) 4209 end++; 4210 4211 src->seqlo = seq; 4212 if (src->state < TCPS_SYN_SENT) 4213 src->state = TCPS_SYN_SENT; 4214 4215 /* 4216 * May need to slide the window (seqhi may have been set by 4217 * the crappy stack check or if we picked up the connection 4218 * after establishment) 4219 */ 4220 if (src->seqhi == 1 || 4221 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4222 src->seqhi = end + MAX(1, dst->max_win << dws); 4223 if (win > src->max_win) 4224 src->max_win = win; 4225 4226 } else { 4227 ack = ntohl(th->th_ack) - dst->seqdiff; 4228 if (src->seqdiff) { 4229 /* Modulate sequence numbers */ 4230 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4231 src->seqdiff), 0); 4232 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4233 *copyback = 1; 4234 } 4235 end = seq + pd->p_len; 4236 if (th->th_flags & TH_SYN) 4237 end++; 4238 if (th->th_flags & TH_FIN) 4239 end++; 4240 } 4241 4242 if ((th->th_flags & TH_ACK) == 0) { 4243 /* Let it pass through the ack skew check */ 4244 ack = dst->seqlo; 4245 } else if ((ack == 0 && 4246 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4247 /* broken tcp stacks do not set ack */ 4248 (dst->state < TCPS_SYN_SENT)) { 4249 /* 4250 * Many stacks (ours included) will set the ACK number in an 4251 * FIN|ACK if the SYN times out -- no sequence to ACK. 4252 */ 4253 ack = dst->seqlo; 4254 } 4255 4256 if (seq == end) { 4257 /* Ease sequencing restrictions on no data packets */ 4258 seq = src->seqlo; 4259 end = seq; 4260 } 4261 4262 ackskew = dst->seqlo - ack; 4263 4264 4265 /* 4266 * Need to demodulate the sequence numbers in any TCP SACK options 4267 * (Selective ACK). We could optionally validate the SACK values 4268 * against the current ACK window, either forwards or backwards, but 4269 * I'm not confident that SACK has been implemented properly 4270 * everywhere. It wouldn't surprise me if several stacks accidently 4271 * SACK too far backwards of previously ACKed data. There really aren't 4272 * any security implications of bad SACKing unless the target stack 4273 * doesn't validate the option length correctly. Someone trying to 4274 * spoof into a TCP connection won't bother blindly sending SACK 4275 * options anyway. 4276 */ 4277 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4278 if (pf_modulate_sack(m, off, pd, th, dst)) 4279 *copyback = 1; 4280 } 4281 4282 4283#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4284 if (SEQ_GEQ(src->seqhi, end) && 4285 /* Last octet inside other's window space */ 4286 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4287 /* Retrans: not more than one window back */ 4288 (ackskew >= -MAXACKWINDOW) && 4289 /* Acking not more than one reassembled fragment backwards */ 4290 (ackskew <= (MAXACKWINDOW << sws)) && 4291 /* Acking not more than one window forward */ 4292 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4293 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4294 (pd->flags & PFDESC_IP_REAS) == 0)) { 4295 /* Require an exact/+1 sequence match on resets when possible */ 4296 4297 if (dst->scrub || src->scrub) { 4298 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4299 *state, src, dst, copyback)) 4300 return (PF_DROP); 4301 } 4302 4303 /* update max window */ 4304 if (src->max_win < win) 4305 src->max_win = win; 4306 /* synchronize sequencing */ 4307 if (SEQ_GT(end, src->seqlo)) 4308 src->seqlo = end; 4309 /* slide the window of what the other end can send */ 4310 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4311 dst->seqhi = ack + MAX((win << sws), 1); 4312 4313 4314 /* update states */ 4315 if (th->th_flags & TH_SYN) 4316 if (src->state < TCPS_SYN_SENT) 4317 src->state = TCPS_SYN_SENT; 4318 if (th->th_flags & TH_FIN) 4319 if (src->state < TCPS_CLOSING) 4320 src->state = TCPS_CLOSING; 4321 if (th->th_flags & TH_ACK) { 4322 if (dst->state == TCPS_SYN_SENT) { 4323 dst->state = TCPS_ESTABLISHED; 4324 if (src->state == TCPS_ESTABLISHED && 4325 (*state)->src_node != NULL && 4326 pf_src_connlimit(state)) { 4327 REASON_SET(reason, PFRES_SRCLIMIT); 4328 return (PF_DROP); 4329 } 4330 } else if (dst->state == TCPS_CLOSING) 4331 dst->state = TCPS_FIN_WAIT_2; 4332 } 4333 if (th->th_flags & TH_RST) 4334 src->state = dst->state = TCPS_TIME_WAIT; 4335 4336 /* update expire time */ 4337 (*state)->expire = time_second; 4338 if (src->state >= TCPS_FIN_WAIT_2 && 4339 dst->state >= TCPS_FIN_WAIT_2) 4340 (*state)->timeout = PFTM_TCP_CLOSED; 4341 else if (src->state >= TCPS_CLOSING && 4342 dst->state >= TCPS_CLOSING) 4343 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4344 else if (src->state < TCPS_ESTABLISHED || 4345 dst->state < TCPS_ESTABLISHED) 4346 (*state)->timeout = PFTM_TCP_OPENING; 4347 else if (src->state >= TCPS_CLOSING || 4348 dst->state >= TCPS_CLOSING) 4349 (*state)->timeout = PFTM_TCP_CLOSING; 4350 else 4351 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4352 4353 /* Fall through to PASS packet */ 4354 4355 } else if ((dst->state < TCPS_SYN_SENT || 4356 dst->state >= TCPS_FIN_WAIT_2 || 4357 src->state >= TCPS_FIN_WAIT_2) && 4358 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4359 /* Within a window forward of the originating packet */ 4360 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4361 /* Within a window backward of the originating packet */ 4362 4363 /* 4364 * This currently handles three situations: 4365 * 1) Stupid stacks will shotgun SYNs before their peer 4366 * replies. 4367 * 2) When PF catches an already established stream (the 4368 * firewall rebooted, the state table was flushed, routes 4369 * changed...) 4370 * 3) Packets get funky immediately after the connection 4371 * closes (this should catch Solaris spurious ACK|FINs 4372 * that web servers like to spew after a close) 4373 * 4374 * This must be a little more careful than the above code 4375 * since packet floods will also be caught here. We don't 4376 * update the TTL here to mitigate the damage of a packet 4377 * flood and so the same code can handle awkward establishment 4378 * and a loosened connection close. 4379 * In the establishment case, a correct peer response will 4380 * validate the connection, go through the normal state code 4381 * and keep updating the state TTL. 4382 */ 4383 4384#ifdef __FreeBSD__ 4385 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4386#else 4387 if (pf_status.debug >= PF_DEBUG_MISC) { 4388#endif 4389 printf("pf: loose state match: "); 4390 pf_print_state(*state); 4391 pf_print_flags(th->th_flags); 4392 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4393 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4394#ifdef __FreeBSD__ 4395 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4396 (unsigned long long)(*state)->packets[1], 4397#else 4398 pd->p_len, ackskew, (*state)->packets[0], 4399 (*state)->packets[1], 4400#endif 4401 pd->dir == PF_IN ? "in" : "out", 4402 pd->dir == (*state)->direction ? "fwd" : "rev"); 4403 } 4404 4405 if (dst->scrub || src->scrub) { 4406 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4407 *state, src, dst, copyback)) 4408 return (PF_DROP); 4409 } 4410 4411 /* update max window */ 4412 if (src->max_win < win) 4413 src->max_win = win; 4414 /* synchronize sequencing */ 4415 if (SEQ_GT(end, src->seqlo)) 4416 src->seqlo = end; 4417 /* slide the window of what the other end can send */ 4418 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4419 dst->seqhi = ack + MAX((win << sws), 1); 4420 4421 /* 4422 * Cannot set dst->seqhi here since this could be a shotgunned 4423 * SYN and not an already established connection. 4424 */ 4425 4426 if (th->th_flags & TH_FIN) 4427 if (src->state < TCPS_CLOSING) 4428 src->state = TCPS_CLOSING; 4429 if (th->th_flags & TH_RST) 4430 src->state = dst->state = TCPS_TIME_WAIT; 4431 4432 /* Fall through to PASS packet */ 4433 4434 } else { 4435 if ((*state)->dst.state == TCPS_SYN_SENT && 4436 (*state)->src.state == TCPS_SYN_SENT) { 4437 /* Send RST for state mismatches during handshake */ 4438 if (!(th->th_flags & TH_RST)) 4439#ifdef __FreeBSD__ 4440 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4441#else 4442 pf_send_tcp((*state)->rule.ptr, pd->af, 4443#endif 4444 pd->dst, pd->src, th->th_dport, 4445 th->th_sport, ntohl(th->th_ack), 0, 4446 TH_RST, 0, 0, 4447 (*state)->rule.ptr->return_ttl, 1, 0, 4448 pd->eh, kif->pfik_ifp); 4449 src->seqlo = 0; 4450 src->seqhi = 1; 4451 src->max_win = 1; 4452#ifdef __FreeBSD__ 4453 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4454#else 4455 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4456#endif 4457 printf("pf: BAD state: "); 4458 pf_print_state(*state); 4459 pf_print_flags(th->th_flags); 4460 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4461 "pkts=%llu:%llu dir=%s,%s\n", 4462 seq, orig_seq, ack, pd->p_len, ackskew, 4463#ifdef __FreeBSD__ 4464 (unsigned long long)(*state)->packets[0], 4465 (unsigned long long)(*state)->packets[1], 4466#else 4467 (*state)->packets[0], (*state)->packets[1], 4468#endif 4469 pd->dir == PF_IN ? "in" : "out", 4470 pd->dir == (*state)->direction ? "fwd" : "rev"); 4471 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4472 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4473 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4474 ' ': '2', 4475 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4476 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4477 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4478 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4479 } 4480 REASON_SET(reason, PFRES_BADSTATE); 4481 return (PF_DROP); 4482 } 4483 4484 return (PF_PASS); 4485} 4486 4487int 4488pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4489 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4490{ 4491 struct tcphdr *th = pd->hdr.tcp; 4492 4493 if (th->th_flags & TH_SYN) 4494 if (src->state < TCPS_SYN_SENT) 4495 src->state = TCPS_SYN_SENT; 4496 if (th->th_flags & TH_FIN) 4497 if (src->state < TCPS_CLOSING) 4498 src->state = TCPS_CLOSING; 4499 if (th->th_flags & TH_ACK) { 4500 if (dst->state == TCPS_SYN_SENT) { 4501 dst->state = TCPS_ESTABLISHED; 4502 if (src->state == TCPS_ESTABLISHED && 4503 (*state)->src_node != NULL && 4504 pf_src_connlimit(state)) { 4505 REASON_SET(reason, PFRES_SRCLIMIT); 4506 return (PF_DROP); 4507 } 4508 } else if (dst->state == TCPS_CLOSING) { 4509 dst->state = TCPS_FIN_WAIT_2; 4510 } else if (src->state == TCPS_SYN_SENT && 4511 dst->state < TCPS_SYN_SENT) { 4512 /* 4513 * Handle a special sloppy case where we only see one 4514 * half of the connection. If there is a ACK after 4515 * the initial SYN without ever seeing a packet from 4516 * the destination, set the connection to established. 4517 */ 4518 dst->state = src->state = TCPS_ESTABLISHED; 4519 if ((*state)->src_node != NULL && 4520 pf_src_connlimit(state)) { 4521 REASON_SET(reason, PFRES_SRCLIMIT); 4522 return (PF_DROP); 4523 } 4524 } else if (src->state == TCPS_CLOSING && 4525 dst->state == TCPS_ESTABLISHED && 4526 dst->seqlo == 0) { 4527 /* 4528 * Handle the closing of half connections where we 4529 * don't see the full bidirectional FIN/ACK+ACK 4530 * handshake. 4531 */ 4532 dst->state = TCPS_CLOSING; 4533 } 4534 } 4535 if (th->th_flags & TH_RST) 4536 src->state = dst->state = TCPS_TIME_WAIT; 4537 4538 /* update expire time */ 4539 (*state)->expire = time_second; 4540 if (src->state >= TCPS_FIN_WAIT_2 && 4541 dst->state >= TCPS_FIN_WAIT_2) 4542 (*state)->timeout = PFTM_TCP_CLOSED; 4543 else if (src->state >= TCPS_CLOSING && 4544 dst->state >= TCPS_CLOSING) 4545 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4546 else if (src->state < TCPS_ESTABLISHED || 4547 dst->state < TCPS_ESTABLISHED) 4548 (*state)->timeout = PFTM_TCP_OPENING; 4549 else if (src->state >= TCPS_CLOSING || 4550 dst->state >= TCPS_CLOSING) 4551 (*state)->timeout = PFTM_TCP_CLOSING; 4552 else 4553 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4554 4555 return (PF_PASS); 4556} 4557 4558int 4559pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4560 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4561 u_short *reason) 4562{ 4563 struct pf_state_key_cmp key; 4564 struct tcphdr *th = pd->hdr.tcp; 4565 int copyback = 0; 4566 struct pf_state_peer *src, *dst; 4567 struct pf_state_key *sk; 4568 4569 key.af = pd->af; 4570 key.proto = IPPROTO_TCP; 4571 if (direction == PF_IN) { /* wire side, straight */ 4572 PF_ACPY(&key.addr[0], pd->src, key.af); 4573 PF_ACPY(&key.addr[1], pd->dst, key.af); 4574 key.port[0] = th->th_sport; 4575 key.port[1] = th->th_dport; 4576 } else { /* stack side, reverse */ 4577 PF_ACPY(&key.addr[1], pd->src, key.af); 4578 PF_ACPY(&key.addr[0], pd->dst, key.af); 4579 key.port[1] = th->th_sport; 4580 key.port[0] = th->th_dport; 4581 } 4582 4583#ifdef __FreeBSD__ 4584 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 4585#else 4586 STATE_LOOKUP(kif, &key, direction, *state, m); 4587#endif 4588 4589 if (direction == (*state)->direction) { 4590 src = &(*state)->src; 4591 dst = &(*state)->dst; 4592 } else { 4593 src = &(*state)->dst; 4594 dst = &(*state)->src; 4595 } 4596 4597 sk = (*state)->key[pd->didx]; 4598 4599 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4600 if (direction != (*state)->direction) { 4601 REASON_SET(reason, PFRES_SYNPROXY); 4602 return (PF_SYNPROXY_DROP); 4603 } 4604 if (th->th_flags & TH_SYN) { 4605 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4606 REASON_SET(reason, PFRES_SYNPROXY); 4607 return (PF_DROP); 4608 } 4609#ifdef __FreeBSD__ 4610 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4611#else 4612 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4613#endif 4614 pd->src, th->th_dport, th->th_sport, 4615 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4616 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4617 0, NULL, NULL); 4618 REASON_SET(reason, PFRES_SYNPROXY); 4619 return (PF_SYNPROXY_DROP); 4620 } else if (!(th->th_flags & TH_ACK) || 4621 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4622 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4623 REASON_SET(reason, PFRES_SYNPROXY); 4624 return (PF_DROP); 4625 } else if ((*state)->src_node != NULL && 4626 pf_src_connlimit(state)) { 4627 REASON_SET(reason, PFRES_SRCLIMIT); 4628 return (PF_DROP); 4629 } else 4630 (*state)->src.state = PF_TCPS_PROXY_DST; 4631 } 4632 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4633 if (direction == (*state)->direction) { 4634 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4635 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4636 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4637 REASON_SET(reason, PFRES_SYNPROXY); 4638 return (PF_DROP); 4639 } 4640 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4641 if ((*state)->dst.seqhi == 1) 4642 (*state)->dst.seqhi = htonl(arc4random()); 4643#ifdef __FreeBSD__ 4644 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4645#else 4646 pf_send_tcp((*state)->rule.ptr, pd->af, 4647#endif 4648 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4649 sk->port[pd->sidx], sk->port[pd->didx], 4650 (*state)->dst.seqhi, 0, TH_SYN, 0, 4651 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4652 REASON_SET(reason, PFRES_SYNPROXY); 4653 return (PF_SYNPROXY_DROP); 4654 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4655 (TH_SYN|TH_ACK)) || 4656 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4657 REASON_SET(reason, PFRES_SYNPROXY); 4658 return (PF_DROP); 4659 } else { 4660 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4661 (*state)->dst.seqlo = ntohl(th->th_seq); 4662#ifdef __FreeBSD__ 4663 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4664#else 4665 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4666#endif 4667 pd->src, th->th_dport, th->th_sport, 4668 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4669 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4670 (*state)->tag, NULL, NULL); 4671#ifdef __FreeBSD__ 4672 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4673#else 4674 pf_send_tcp((*state)->rule.ptr, pd->af, 4675#endif 4676 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4677 sk->port[pd->sidx], sk->port[pd->didx], 4678 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4679 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4680 0, NULL, NULL); 4681 (*state)->src.seqdiff = (*state)->dst.seqhi - 4682 (*state)->src.seqlo; 4683 (*state)->dst.seqdiff = (*state)->src.seqhi - 4684 (*state)->dst.seqlo; 4685 (*state)->src.seqhi = (*state)->src.seqlo + 4686 (*state)->dst.max_win; 4687 (*state)->dst.seqhi = (*state)->dst.seqlo + 4688 (*state)->src.max_win; 4689 (*state)->src.wscale = (*state)->dst.wscale = 0; 4690 (*state)->src.state = (*state)->dst.state = 4691 TCPS_ESTABLISHED; 4692 REASON_SET(reason, PFRES_SYNPROXY); 4693 return (PF_SYNPROXY_DROP); 4694 } 4695 } 4696 4697 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4698 dst->state >= TCPS_FIN_WAIT_2 && 4699 src->state >= TCPS_FIN_WAIT_2) { 4700#ifdef __FreeBSD__ 4701 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4702#else 4703 if (pf_status.debug >= PF_DEBUG_MISC) { 4704#endif 4705 printf("pf: state reuse "); 4706 pf_print_state(*state); 4707 pf_print_flags(th->th_flags); 4708 printf("\n"); 4709 } 4710 /* XXX make sure it's the same direction ?? */ 4711 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4712 pf_unlink_state(*state); 4713 *state = NULL; 4714 return (PF_DROP); 4715 } 4716 4717 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4718 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4719 return (PF_DROP); 4720 } else { 4721 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4722 ©back) == PF_DROP) 4723 return (PF_DROP); 4724 } 4725 4726 /* translate source/destination address, if necessary */ 4727 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4728 struct pf_state_key *nk = (*state)->key[pd->didx]; 4729 4730 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4731 nk->port[pd->sidx] != th->th_sport) 4732 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4733 &th->th_sum, &nk->addr[pd->sidx], 4734 nk->port[pd->sidx], 0, pd->af); 4735 4736 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4737 nk->port[pd->didx] != th->th_dport) 4738 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4739 &th->th_sum, &nk->addr[pd->didx], 4740 nk->port[pd->didx], 0, pd->af); 4741 copyback = 1; 4742 } 4743 4744 /* Copyback sequence modulation or stateful scrub changes if needed */ 4745 if (copyback) 4746#ifdef __FreeBSD__ 4747 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4748#else 4749 m_copyback(m, off, sizeof(*th), th); 4750#endif 4751 4752 return (PF_PASS); 4753} 4754 4755int 4756pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4757 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4758{ 4759 struct pf_state_peer *src, *dst; 4760 struct pf_state_key_cmp key; 4761 struct udphdr *uh = pd->hdr.udp; 4762 4763 key.af = pd->af; 4764 key.proto = IPPROTO_UDP; 4765 if (direction == PF_IN) { /* wire side, straight */ 4766 PF_ACPY(&key.addr[0], pd->src, key.af); 4767 PF_ACPY(&key.addr[1], pd->dst, key.af); 4768 key.port[0] = uh->uh_sport; 4769 key.port[1] = uh->uh_dport; 4770 } else { /* stack side, reverse */ 4771 PF_ACPY(&key.addr[1], pd->src, key.af); 4772 PF_ACPY(&key.addr[0], pd->dst, key.af); 4773 key.port[1] = uh->uh_sport; 4774 key.port[0] = uh->uh_dport; 4775 } 4776 4777#ifdef __FreeBSD__ 4778 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 4779#else 4780 STATE_LOOKUP(kif, &key, direction, *state, m); 4781#endif 4782 4783 if (direction == (*state)->direction) { 4784 src = &(*state)->src; 4785 dst = &(*state)->dst; 4786 } else { 4787 src = &(*state)->dst; 4788 dst = &(*state)->src; 4789 } 4790 4791 /* update states */ 4792 if (src->state < PFUDPS_SINGLE) 4793 src->state = PFUDPS_SINGLE; 4794 if (dst->state == PFUDPS_SINGLE) 4795 dst->state = PFUDPS_MULTIPLE; 4796 4797 /* update expire time */ 4798 (*state)->expire = time_second; 4799 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4800 (*state)->timeout = PFTM_UDP_MULTIPLE; 4801 else 4802 (*state)->timeout = PFTM_UDP_SINGLE; 4803 4804 /* translate source/destination address, if necessary */ 4805 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4806 struct pf_state_key *nk = (*state)->key[pd->didx]; 4807 4808 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4809 nk->port[pd->sidx] != uh->uh_sport) 4810 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4811 &uh->uh_sum, &nk->addr[pd->sidx], 4812 nk->port[pd->sidx], 1, pd->af); 4813 4814 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4815 nk->port[pd->didx] != uh->uh_dport) 4816 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4817 &uh->uh_sum, &nk->addr[pd->didx], 4818 nk->port[pd->didx], 1, pd->af); 4819#ifdef __FreeBSD__ 4820 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4821#else 4822 m_copyback(m, off, sizeof(*uh), uh); 4823#endif 4824 } 4825 4826 return (PF_PASS); 4827} 4828 4829int 4830pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4831 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4832{ 4833 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4834#ifdef __FreeBSD__ 4835 u_int16_t icmpid = 0, *icmpsum; 4836#else 4837 u_int16_t icmpid, *icmpsum; 4838#endif 4839 u_int8_t icmptype; 4840 int state_icmp = 0; 4841 struct pf_state_key_cmp key; 4842 4843 switch (pd->proto) { 4844#ifdef INET 4845 case IPPROTO_ICMP: 4846 icmptype = pd->hdr.icmp->icmp_type; 4847 icmpid = pd->hdr.icmp->icmp_id; 4848 icmpsum = &pd->hdr.icmp->icmp_cksum; 4849 4850 if (icmptype == ICMP_UNREACH || 4851 icmptype == ICMP_SOURCEQUENCH || 4852 icmptype == ICMP_REDIRECT || 4853 icmptype == ICMP_TIMXCEED || 4854 icmptype == ICMP_PARAMPROB) 4855 state_icmp++; 4856 break; 4857#endif /* INET */ 4858#ifdef INET6 4859 case IPPROTO_ICMPV6: 4860 icmptype = pd->hdr.icmp6->icmp6_type; 4861 icmpid = pd->hdr.icmp6->icmp6_id; 4862 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4863 4864 if (icmptype == ICMP6_DST_UNREACH || 4865 icmptype == ICMP6_PACKET_TOO_BIG || 4866 icmptype == ICMP6_TIME_EXCEEDED || 4867 icmptype == ICMP6_PARAM_PROB) 4868 state_icmp++; 4869 break; 4870#endif /* INET6 */ 4871 } 4872 4873 if (!state_icmp) { 4874 4875 /* 4876 * ICMP query/reply message not related to a TCP/UDP packet. 4877 * Search for an ICMP state. 4878 */ 4879 key.af = pd->af; 4880 key.proto = pd->proto; 4881 key.port[0] = key.port[1] = icmpid; 4882 if (direction == PF_IN) { /* wire side, straight */ 4883 PF_ACPY(&key.addr[0], pd->src, key.af); 4884 PF_ACPY(&key.addr[1], pd->dst, key.af); 4885 } else { /* stack side, reverse */ 4886 PF_ACPY(&key.addr[1], pd->src, key.af); 4887 PF_ACPY(&key.addr[0], pd->dst, key.af); 4888 } 4889 4890#ifdef __FreeBSD__ 4891 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 4892#else 4893 STATE_LOOKUP(kif, &key, direction, *state, m); 4894#endif 4895 4896 (*state)->expire = time_second; 4897 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4898 4899 /* translate source/destination address, if necessary */ 4900 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4901 struct pf_state_key *nk = (*state)->key[pd->didx]; 4902 4903 switch (pd->af) { 4904#ifdef INET 4905 case AF_INET: 4906 if (PF_ANEQ(pd->src, 4907 &nk->addr[pd->sidx], AF_INET)) 4908 pf_change_a(&saddr->v4.s_addr, 4909 pd->ip_sum, 4910 nk->addr[pd->sidx].v4.s_addr, 0); 4911 4912 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4913 AF_INET)) 4914 pf_change_a(&daddr->v4.s_addr, 4915 pd->ip_sum, 4916 nk->addr[pd->didx].v4.s_addr, 0); 4917 4918 if (nk->port[0] != 4919 pd->hdr.icmp->icmp_id) { 4920 pd->hdr.icmp->icmp_cksum = 4921 pf_cksum_fixup( 4922 pd->hdr.icmp->icmp_cksum, icmpid, 4923 nk->port[pd->sidx], 0); 4924 pd->hdr.icmp->icmp_id = 4925 nk->port[pd->sidx]; 4926 } 4927 4928 m_copyback(m, off, ICMP_MINLEN, 4929#ifdef __FreeBSD__ 4930 (caddr_t) 4931#endif 4932 pd->hdr.icmp); 4933 break; 4934#endif /* INET */ 4935#ifdef INET6 4936 case AF_INET6: 4937 if (PF_ANEQ(pd->src, 4938 &nk->addr[pd->sidx], AF_INET6)) 4939 pf_change_a6(saddr, 4940 &pd->hdr.icmp6->icmp6_cksum, 4941 &nk->addr[pd->sidx], 0); 4942 4943 if (PF_ANEQ(pd->dst, 4944 &nk->addr[pd->didx], AF_INET6)) 4945 pf_change_a6(daddr, 4946 &pd->hdr.icmp6->icmp6_cksum, 4947 &nk->addr[pd->didx], 0); 4948 4949 m_copyback(m, off, 4950 sizeof(struct icmp6_hdr), 4951#ifdef __FreeBSD__ 4952 (caddr_t) 4953#endif 4954 pd->hdr.icmp6); 4955 break; 4956#endif /* INET6 */ 4957 } 4958 } 4959 return (PF_PASS); 4960 4961 } else { 4962 /* 4963 * ICMP error message in response to a TCP/UDP packet. 4964 * Extract the inner TCP/UDP header and search for that state. 4965 */ 4966 4967 struct pf_pdesc pd2; 4968#ifdef __FreeBSD__ 4969 bzero(&pd2, sizeof pd2); 4970#endif 4971#ifdef INET 4972 struct ip h2; 4973#endif /* INET */ 4974#ifdef INET6 4975 struct ip6_hdr h2_6; 4976 int terminal = 0; 4977#endif /* INET6 */ 4978#ifdef __FreeBSD__ 4979 int ipoff2 = 0; 4980 int off2 = 0; 4981#else 4982 int ipoff2; 4983 int off2; 4984#endif 4985 4986 pd2.af = pd->af; 4987 /* Payload packet is from the opposite direction. */ 4988 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4989 pd2.didx = (direction == PF_IN) ? 0 : 1; 4990 switch (pd->af) { 4991#ifdef INET 4992 case AF_INET: 4993 /* offset of h2 in mbuf chain */ 4994 ipoff2 = off + ICMP_MINLEN; 4995 4996 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4997 NULL, reason, pd2.af)) { 4998 DPFPRINTF(PF_DEBUG_MISC, 4999 ("pf: ICMP error message too short " 5000 "(ip)\n")); 5001 return (PF_DROP); 5002 } 5003 /* 5004 * ICMP error messages don't refer to non-first 5005 * fragments 5006 */ 5007 if (h2.ip_off & htons(IP_OFFMASK)) { 5008 REASON_SET(reason, PFRES_FRAG); 5009 return (PF_DROP); 5010 } 5011 5012 /* offset of protocol header that follows h2 */ 5013 off2 = ipoff2 + (h2.ip_hl << 2); 5014 5015 pd2.proto = h2.ip_p; 5016 pd2.src = (struct pf_addr *)&h2.ip_src; 5017 pd2.dst = (struct pf_addr *)&h2.ip_dst; 5018 pd2.ip_sum = &h2.ip_sum; 5019 break; 5020#endif /* INET */ 5021#ifdef INET6 5022 case AF_INET6: 5023 ipoff2 = off + sizeof(struct icmp6_hdr); 5024 5025 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5026 NULL, reason, pd2.af)) { 5027 DPFPRINTF(PF_DEBUG_MISC, 5028 ("pf: ICMP error message too short " 5029 "(ip6)\n")); 5030 return (PF_DROP); 5031 } 5032 pd2.proto = h2_6.ip6_nxt; 5033 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5034 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5035 pd2.ip_sum = NULL; 5036 off2 = ipoff2 + sizeof(h2_6); 5037 do { 5038 switch (pd2.proto) { 5039 case IPPROTO_FRAGMENT: 5040 /* 5041 * ICMPv6 error messages for 5042 * non-first fragments 5043 */ 5044 REASON_SET(reason, PFRES_FRAG); 5045 return (PF_DROP); 5046 case IPPROTO_AH: 5047 case IPPROTO_HOPOPTS: 5048 case IPPROTO_ROUTING: 5049 case IPPROTO_DSTOPTS: { 5050 /* get next header and header length */ 5051 struct ip6_ext opt6; 5052 5053 if (!pf_pull_hdr(m, off2, &opt6, 5054 sizeof(opt6), NULL, reason, 5055 pd2.af)) { 5056 DPFPRINTF(PF_DEBUG_MISC, 5057 ("pf: ICMPv6 short opt\n")); 5058 return (PF_DROP); 5059 } 5060 if (pd2.proto == IPPROTO_AH) 5061 off2 += (opt6.ip6e_len + 2) * 4; 5062 else 5063 off2 += (opt6.ip6e_len + 1) * 8; 5064 pd2.proto = opt6.ip6e_nxt; 5065 /* goto the next header */ 5066 break; 5067 } 5068 default: 5069 terminal++; 5070 break; 5071 } 5072 } while (!terminal); 5073 break; 5074#endif /* INET6 */ 5075 } 5076 5077 switch (pd2.proto) { 5078 case IPPROTO_TCP: { 5079 struct tcphdr th; 5080 u_int32_t seq; 5081 struct pf_state_peer *src, *dst; 5082 u_int8_t dws; 5083 int copyback = 0; 5084 5085 /* 5086 * Only the first 8 bytes of the TCP header can be 5087 * expected. Don't access any TCP header fields after 5088 * th_seq, an ackskew test is not possible. 5089 */ 5090 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5091 pd2.af)) { 5092 DPFPRINTF(PF_DEBUG_MISC, 5093 ("pf: ICMP error message too short " 5094 "(tcp)\n")); 5095 return (PF_DROP); 5096 } 5097 5098 key.af = pd2.af; 5099 key.proto = IPPROTO_TCP; 5100 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5101 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5102 key.port[pd2.sidx] = th.th_sport; 5103 key.port[pd2.didx] = th.th_dport; 5104 5105#ifdef __FreeBSD__ 5106 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5107#else 5108 STATE_LOOKUP(kif, &key, direction, *state, m); 5109#endif 5110 5111 if (direction == (*state)->direction) { 5112 src = &(*state)->dst; 5113 dst = &(*state)->src; 5114 } else { 5115 src = &(*state)->src; 5116 dst = &(*state)->dst; 5117 } 5118 5119 if (src->wscale && dst->wscale) 5120 dws = dst->wscale & PF_WSCALE_MASK; 5121 else 5122 dws = 0; 5123 5124 /* Demodulate sequence number */ 5125 seq = ntohl(th.th_seq) - src->seqdiff; 5126 if (src->seqdiff) { 5127 pf_change_a(&th.th_seq, icmpsum, 5128 htonl(seq), 0); 5129 copyback = 1; 5130 } 5131 5132 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 5133 (!SEQ_GEQ(src->seqhi, seq) || 5134 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 5135#ifdef __FreeBSD__ 5136 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5137#else 5138 if (pf_status.debug >= PF_DEBUG_MISC) { 5139#endif 5140 printf("pf: BAD ICMP %d:%d ", 5141 icmptype, pd->hdr.icmp->icmp_code); 5142 pf_print_host(pd->src, 0, pd->af); 5143 printf(" -> "); 5144 pf_print_host(pd->dst, 0, pd->af); 5145 printf(" state: "); 5146 pf_print_state(*state); 5147 printf(" seq=%u\n", seq); 5148 } 5149 REASON_SET(reason, PFRES_BADSTATE); 5150 return (PF_DROP); 5151 } else { 5152#ifdef __FreeBSD__ 5153 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5154#else 5155 if (pf_status.debug >= PF_DEBUG_MISC) { 5156#endif 5157 printf("pf: OK ICMP %d:%d ", 5158 icmptype, pd->hdr.icmp->icmp_code); 5159 pf_print_host(pd->src, 0, pd->af); 5160 printf(" -> "); 5161 pf_print_host(pd->dst, 0, pd->af); 5162 printf(" state: "); 5163 pf_print_state(*state); 5164 printf(" seq=%u\n", seq); 5165 } 5166 } 5167 5168 /* translate source/destination address, if necessary */ 5169 if ((*state)->key[PF_SK_WIRE] != 5170 (*state)->key[PF_SK_STACK]) { 5171 struct pf_state_key *nk = 5172 (*state)->key[pd->didx]; 5173 5174 if (PF_ANEQ(pd2.src, 5175 &nk->addr[pd2.sidx], pd2.af) || 5176 nk->port[pd2.sidx] != th.th_sport) 5177 pf_change_icmp(pd2.src, &th.th_sport, 5178 daddr, &nk->addr[pd2.sidx], 5179 nk->port[pd2.sidx], NULL, 5180 pd2.ip_sum, icmpsum, 5181 pd->ip_sum, 0, pd2.af); 5182 5183 if (PF_ANEQ(pd2.dst, 5184 &nk->addr[pd2.didx], pd2.af) || 5185 nk->port[pd2.didx] != th.th_dport) 5186 pf_change_icmp(pd2.dst, &th.th_dport, 5187 NULL, /* XXX Inbound NAT? */ 5188 &nk->addr[pd2.didx], 5189 nk->port[pd2.didx], NULL, 5190 pd2.ip_sum, icmpsum, 5191 pd->ip_sum, 0, pd2.af); 5192 copyback = 1; 5193 } 5194 5195 if (copyback) { 5196 switch (pd2.af) { 5197#ifdef INET 5198 case AF_INET: 5199 m_copyback(m, off, ICMP_MINLEN, 5200#ifdef __FreeBSD__ 5201 (caddr_t) 5202#endif 5203 pd->hdr.icmp); 5204 m_copyback(m, ipoff2, sizeof(h2), 5205#ifdef __FreeBSD__ 5206 (caddr_t) 5207#endif 5208 &h2); 5209 break; 5210#endif /* INET */ 5211#ifdef INET6 5212 case AF_INET6: 5213 m_copyback(m, off, 5214 sizeof(struct icmp6_hdr), 5215#ifdef __FreeBSD__ 5216 (caddr_t) 5217#endif 5218 pd->hdr.icmp6); 5219 m_copyback(m, ipoff2, sizeof(h2_6), 5220#ifdef __FreeBSD__ 5221 (caddr_t) 5222#endif 5223 &h2_6); 5224 break; 5225#endif /* INET6 */ 5226 } 5227#ifdef __FreeBSD__ 5228 m_copyback(m, off2, 8, (caddr_t)&th); 5229#else 5230 m_copyback(m, off2, 8, &th); 5231#endif 5232 } 5233 5234 return (PF_PASS); 5235 break; 5236 } 5237 case IPPROTO_UDP: { 5238 struct udphdr uh; 5239 5240 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5241 NULL, reason, pd2.af)) { 5242 DPFPRINTF(PF_DEBUG_MISC, 5243 ("pf: ICMP error message too short " 5244 "(udp)\n")); 5245 return (PF_DROP); 5246 } 5247 5248 key.af = pd2.af; 5249 key.proto = IPPROTO_UDP; 5250 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5251 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5252 key.port[pd2.sidx] = uh.uh_sport; 5253 key.port[pd2.didx] = uh.uh_dport; 5254 5255#ifdef __FreeBSD__ 5256 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5257#else 5258 STATE_LOOKUP(kif, &key, direction, *state, m); 5259#endif 5260 5261 /* translate source/destination address, if necessary */ 5262 if ((*state)->key[PF_SK_WIRE] != 5263 (*state)->key[PF_SK_STACK]) { 5264 struct pf_state_key *nk = 5265 (*state)->key[pd->didx]; 5266 5267 if (PF_ANEQ(pd2.src, 5268 &nk->addr[pd2.sidx], pd2.af) || 5269 nk->port[pd2.sidx] != uh.uh_sport) 5270 pf_change_icmp(pd2.src, &uh.uh_sport, 5271 daddr, &nk->addr[pd2.sidx], 5272 nk->port[pd2.sidx], &uh.uh_sum, 5273 pd2.ip_sum, icmpsum, 5274 pd->ip_sum, 1, pd2.af); 5275 5276 if (PF_ANEQ(pd2.dst, 5277 &nk->addr[pd2.didx], pd2.af) || 5278 nk->port[pd2.didx] != uh.uh_dport) 5279 pf_change_icmp(pd2.dst, &uh.uh_dport, 5280 NULL, /* XXX Inbound NAT? */ 5281 &nk->addr[pd2.didx], 5282 nk->port[pd2.didx], &uh.uh_sum, 5283 pd2.ip_sum, icmpsum, 5284 pd->ip_sum, 1, pd2.af); 5285 5286 switch (pd2.af) { 5287#ifdef INET 5288 case AF_INET: 5289 m_copyback(m, off, ICMP_MINLEN, 5290#ifdef __FreeBSD__ 5291 (caddr_t) 5292#endif 5293 pd->hdr.icmp); 5294#ifdef __FreeBSD__ 5295 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5296#else 5297 m_copyback(m, ipoff2, sizeof(h2), &h2); 5298#endif 5299 break; 5300#endif /* INET */ 5301#ifdef INET6 5302 case AF_INET6: 5303 m_copyback(m, off, 5304 sizeof(struct icmp6_hdr), 5305#ifdef __FreeBSD__ 5306 (caddr_t) 5307#endif 5308 pd->hdr.icmp6); 5309 m_copyback(m, ipoff2, sizeof(h2_6), 5310#ifdef __FreeBSD__ 5311 (caddr_t) 5312#endif 5313 &h2_6); 5314 break; 5315#endif /* INET6 */ 5316 } 5317#ifdef __FreeBSD__ 5318 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 5319#else 5320 m_copyback(m, off2, sizeof(uh), &uh); 5321#endif 5322 } 5323 return (PF_PASS); 5324 break; 5325 } 5326#ifdef INET 5327 case IPPROTO_ICMP: { 5328 struct icmp iih; 5329 5330 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5331 NULL, reason, pd2.af)) { 5332 DPFPRINTF(PF_DEBUG_MISC, 5333 ("pf: ICMP error message too short i" 5334 "(icmp)\n")); 5335 return (PF_DROP); 5336 } 5337 5338 key.af = pd2.af; 5339 key.proto = IPPROTO_ICMP; 5340 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5341 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5342 key.port[0] = key.port[1] = iih.icmp_id; 5343 5344#ifdef __FreeBSD__ 5345 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5346#else 5347 STATE_LOOKUP(kif, &key, direction, *state, m); 5348#endif 5349 5350 /* translate source/destination address, if necessary */ 5351 if ((*state)->key[PF_SK_WIRE] != 5352 (*state)->key[PF_SK_STACK]) { 5353 struct pf_state_key *nk = 5354 (*state)->key[pd->didx]; 5355 5356 if (PF_ANEQ(pd2.src, 5357 &nk->addr[pd2.sidx], pd2.af) || 5358 nk->port[pd2.sidx] != iih.icmp_id) 5359 pf_change_icmp(pd2.src, &iih.icmp_id, 5360 daddr, &nk->addr[pd2.sidx], 5361 nk->port[pd2.sidx], NULL, 5362 pd2.ip_sum, icmpsum, 5363 pd->ip_sum, 0, AF_INET); 5364 5365 if (PF_ANEQ(pd2.dst, 5366 &nk->addr[pd2.didx], pd2.af) || 5367 nk->port[pd2.didx] != iih.icmp_id) 5368 pf_change_icmp(pd2.dst, &iih.icmp_id, 5369 NULL, /* XXX Inbound NAT? */ 5370 &nk->addr[pd2.didx], 5371 nk->port[pd2.didx], NULL, 5372 pd2.ip_sum, icmpsum, 5373 pd->ip_sum, 0, AF_INET); 5374 5375#ifdef __FreeBSD__ 5376 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 5377 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5378 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 5379#else 5380 m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 5381 m_copyback(m, ipoff2, sizeof(h2), &h2); 5382 m_copyback(m, off2, ICMP_MINLEN, &iih); 5383#endif 5384 } 5385 return (PF_PASS); 5386 break; 5387 } 5388#endif /* INET */ 5389#ifdef INET6 5390 case IPPROTO_ICMPV6: { 5391 struct icmp6_hdr iih; 5392 5393 if (!pf_pull_hdr(m, off2, &iih, 5394 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5395 DPFPRINTF(PF_DEBUG_MISC, 5396 ("pf: ICMP error message too short " 5397 "(icmp6)\n")); 5398 return (PF_DROP); 5399 } 5400 5401 key.af = pd2.af; 5402 key.proto = IPPROTO_ICMPV6; 5403 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5404 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5405 key.port[0] = key.port[1] = iih.icmp6_id; 5406 5407#ifdef __FreeBSD__ 5408 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5409#else 5410 STATE_LOOKUP(kif, &key, direction, *state, m); 5411#endif 5412 5413 /* translate source/destination address, if necessary */ 5414 if ((*state)->key[PF_SK_WIRE] != 5415 (*state)->key[PF_SK_STACK]) { 5416 struct pf_state_key *nk = 5417 (*state)->key[pd->didx]; 5418 5419 if (PF_ANEQ(pd2.src, 5420 &nk->addr[pd2.sidx], pd2.af) || 5421 nk->port[pd2.sidx] != iih.icmp6_id) 5422 pf_change_icmp(pd2.src, &iih.icmp6_id, 5423 daddr, &nk->addr[pd2.sidx], 5424 nk->port[pd2.sidx], NULL, 5425 pd2.ip_sum, icmpsum, 5426 pd->ip_sum, 0, AF_INET6); 5427 5428 if (PF_ANEQ(pd2.dst, 5429 &nk->addr[pd2.didx], pd2.af) || 5430 nk->port[pd2.didx] != iih.icmp6_id) 5431 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5432 NULL, /* XXX Inbound NAT? */ 5433 &nk->addr[pd2.didx], 5434 nk->port[pd2.didx], NULL, 5435 pd2.ip_sum, icmpsum, 5436 pd->ip_sum, 0, AF_INET6); 5437 5438#ifdef __FreeBSD__ 5439 m_copyback(m, off, sizeof(struct icmp6_hdr), 5440 (caddr_t)pd->hdr.icmp6); 5441 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5442 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5443 (caddr_t)&iih); 5444#else 5445 m_copyback(m, off, sizeof(struct icmp6_hdr), 5446 pd->hdr.icmp6); 5447 m_copyback(m, ipoff2, sizeof(h2_6), &h2_6); 5448 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5449 &iih); 5450#endif 5451 } 5452 return (PF_PASS); 5453 break; 5454 } 5455#endif /* INET6 */ 5456 default: { 5457 key.af = pd2.af; 5458 key.proto = pd2.proto; 5459 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5460 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5461 key.port[0] = key.port[1] = 0; 5462 5463#ifdef __FreeBSD__ 5464 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5465#else 5466 STATE_LOOKUP(kif, &key, direction, *state, m); 5467#endif 5468 5469 /* translate source/destination address, if necessary */ 5470 if ((*state)->key[PF_SK_WIRE] != 5471 (*state)->key[PF_SK_STACK]) { 5472 struct pf_state_key *nk = 5473 (*state)->key[pd->didx]; 5474 5475 if (PF_ANEQ(pd2.src, 5476 &nk->addr[pd2.sidx], pd2.af)) 5477 pf_change_icmp(pd2.src, NULL, daddr, 5478 &nk->addr[pd2.sidx], 0, NULL, 5479 pd2.ip_sum, icmpsum, 5480 pd->ip_sum, 0, pd2.af); 5481 5482 if (PF_ANEQ(pd2.dst, 5483 &nk->addr[pd2.didx], pd2.af)) 5484 pf_change_icmp(pd2.src, NULL, 5485 NULL, /* XXX Inbound NAT? */ 5486 &nk->addr[pd2.didx], 0, NULL, 5487 pd2.ip_sum, icmpsum, 5488 pd->ip_sum, 0, pd2.af); 5489 5490 switch (pd2.af) { 5491#ifdef INET 5492 case AF_INET: 5493#ifdef __FreeBSD__ 5494 m_copyback(m, off, ICMP_MINLEN, 5495 (caddr_t)pd->hdr.icmp); 5496 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5497#else 5498 m_copyback(m, off, ICMP_MINLEN, 5499 pd->hdr.icmp); 5500 m_copyback(m, ipoff2, sizeof(h2), &h2); 5501#endif 5502 break; 5503#endif /* INET */ 5504#ifdef INET6 5505 case AF_INET6: 5506 m_copyback(m, off, 5507 sizeof(struct icmp6_hdr), 5508#ifdef __FreeBSD__ 5509 (caddr_t) 5510#endif 5511 pd->hdr.icmp6); 5512 m_copyback(m, ipoff2, sizeof(h2_6), 5513#ifdef __FreeBSD__ 5514 (caddr_t) 5515#endif 5516 &h2_6); 5517 break; 5518#endif /* INET6 */ 5519 } 5520 } 5521 return (PF_PASS); 5522 break; 5523 } 5524 } 5525 } 5526} 5527 5528int 5529pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5530 struct mbuf *m, struct pf_pdesc *pd) 5531{ 5532 struct pf_state_peer *src, *dst; 5533 struct pf_state_key_cmp key; 5534 5535 key.af = pd->af; 5536 key.proto = pd->proto; 5537 if (direction == PF_IN) { 5538 PF_ACPY(&key.addr[0], pd->src, key.af); 5539 PF_ACPY(&key.addr[1], pd->dst, key.af); 5540 key.port[0] = key.port[1] = 0; 5541 } else { 5542 PF_ACPY(&key.addr[1], pd->src, key.af); 5543 PF_ACPY(&key.addr[0], pd->dst, key.af); 5544 key.port[1] = key.port[0] = 0; 5545 } 5546 5547#ifdef __FreeBSD__ 5548 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5549#else 5550 STATE_LOOKUP(kif, &key, direction, *state, m); 5551#endif 5552 5553 if (direction == (*state)->direction) { 5554 src = &(*state)->src; 5555 dst = &(*state)->dst; 5556 } else { 5557 src = &(*state)->dst; 5558 dst = &(*state)->src; 5559 } 5560 5561 /* update states */ 5562 if (src->state < PFOTHERS_SINGLE) 5563 src->state = PFOTHERS_SINGLE; 5564 if (dst->state == PFOTHERS_SINGLE) 5565 dst->state = PFOTHERS_MULTIPLE; 5566 5567 /* update expire time */ 5568 (*state)->expire = time_second; 5569 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5570 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5571 else 5572 (*state)->timeout = PFTM_OTHER_SINGLE; 5573 5574 /* translate source/destination address, if necessary */ 5575 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5576 struct pf_state_key *nk = (*state)->key[pd->didx]; 5577 5578#ifdef __FreeBSD__ 5579 KASSERT(nk, ("%s: nk is null", __FUNCTION__)); 5580 KASSERT(pd, ("%s: pd is null", __FUNCTION__)); 5581 KASSERT(pd->src, ("%s: pd->src is null", __FUNCTION__)); 5582 KASSERT(pd->dst, ("%s: pd->dst is null", __FUNCTION__)); 5583#else 5584 KASSERT(nk); 5585 KASSERT(pd); 5586 KASSERT(pd->src); 5587 KASSERT(pd->dst); 5588#endif 5589 switch (pd->af) { 5590#ifdef INET 5591 case AF_INET: 5592 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5593 pf_change_a(&pd->src->v4.s_addr, 5594 pd->ip_sum, 5595 nk->addr[pd->sidx].v4.s_addr, 5596 0); 5597 5598 5599 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5600 pf_change_a(&pd->dst->v4.s_addr, 5601 pd->ip_sum, 5602 nk->addr[pd->didx].v4.s_addr, 5603 0); 5604 5605 break; 5606#endif /* INET */ 5607#ifdef INET6 5608 case AF_INET6: 5609 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5610 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5611 5612 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5613 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5614#endif /* INET6 */ 5615 } 5616 } 5617 return (PF_PASS); 5618} 5619 5620/* 5621 * ipoff and off are measured from the start of the mbuf chain. 5622 * h must be at "ipoff" on the mbuf chain. 5623 */ 5624void * 5625pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5626 u_short *actionp, u_short *reasonp, sa_family_t af) 5627{ 5628 switch (af) { 5629#ifdef INET 5630 case AF_INET: { 5631 struct ip *h = mtod(m, struct ip *); 5632 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5633 5634 if (fragoff) { 5635 if (fragoff >= len) 5636 ACTION_SET(actionp, PF_PASS); 5637 else { 5638 ACTION_SET(actionp, PF_DROP); 5639 REASON_SET(reasonp, PFRES_FRAG); 5640 } 5641 return (NULL); 5642 } 5643 if (m->m_pkthdr.len < off + len || 5644 ntohs(h->ip_len) < off + len) { 5645 ACTION_SET(actionp, PF_DROP); 5646 REASON_SET(reasonp, PFRES_SHORT); 5647 return (NULL); 5648 } 5649 break; 5650 } 5651#endif /* INET */ 5652#ifdef INET6 5653 case AF_INET6: { 5654 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5655 5656 if (m->m_pkthdr.len < off + len || 5657 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5658 (unsigned)(off + len)) { 5659 ACTION_SET(actionp, PF_DROP); 5660 REASON_SET(reasonp, PFRES_SHORT); 5661 return (NULL); 5662 } 5663 break; 5664 } 5665#endif /* INET6 */ 5666 } 5667 m_copydata(m, off, len, p); 5668 return (p); 5669} 5670 5671int 5672pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5673 int rtableid) 5674{ 5675#ifdef __FreeBSD__ 5676#ifdef RADIX_MPATH 5677 struct radix_node_head *rnh; 5678#endif 5679#endif 5680 struct sockaddr_in *dst; 5681 int ret = 1; 5682 int check_mpath; 5683#ifndef __FreeBSD__ 5684 extern int ipmultipath; 5685#endif 5686#ifdef INET6 5687#ifndef __FreeBSD__ 5688 extern int ip6_multipath; 5689#endif 5690 struct sockaddr_in6 *dst6; 5691 struct route_in6 ro; 5692#else 5693 struct route ro; 5694#endif 5695 struct radix_node *rn; 5696 struct rtentry *rt; 5697 struct ifnet *ifp; 5698 5699 check_mpath = 0; 5700#ifdef __FreeBSD__ 5701#ifdef RADIX_MPATH 5702 /* XXX: stick to table 0 for now */ 5703 rnh = rt_tables_get_rnh(0, af); 5704 if (rnh != NULL && rn_mpath_capable(rnh)) 5705 check_mpath = 1; 5706#endif 5707#endif 5708 bzero(&ro, sizeof(ro)); 5709 switch (af) { 5710 case AF_INET: 5711 dst = satosin(&ro.ro_dst); 5712 dst->sin_family = AF_INET; 5713 dst->sin_len = sizeof(*dst); 5714 dst->sin_addr = addr->v4; 5715#ifndef __FreeBSD__ 5716 if (ipmultipath) 5717 check_mpath = 1; 5718#endif 5719 break; 5720#ifdef INET6 5721 case AF_INET6: 5722 /* 5723 * Skip check for addresses with embedded interface scope, 5724 * as they would always match anyway. 5725 */ 5726 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5727 goto out; 5728 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5729 dst6->sin6_family = AF_INET6; 5730 dst6->sin6_len = sizeof(*dst6); 5731 dst6->sin6_addr = addr->v6; 5732#ifndef __FreeBSD__ 5733 if (ip6_multipath) 5734 check_mpath = 1; 5735#endif 5736 break; 5737#endif /* INET6 */ 5738 default: 5739 return (0); 5740 } 5741 5742 /* Skip checks for ipsec interfaces */ 5743 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5744 goto out; 5745 5746#ifdef __FreeBSD__ 5747 switch (af) { 5748#ifdef INET6 5749 case AF_INET6: 5750 in6_rtalloc_ign(&ro, 0, rtableid); 5751 break; 5752#endif 5753#ifdef INET 5754 case AF_INET: 5755 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5756 break; 5757#endif 5758 default: 5759 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5760 break; 5761 } 5762#else /* ! __FreeBSD__ */ 5763 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5764#endif 5765 5766 if (ro.ro_rt != NULL) { 5767 /* No interface given, this is a no-route check */ 5768 if (kif == NULL) 5769 goto out; 5770 5771 if (kif->pfik_ifp == NULL) { 5772 ret = 0; 5773 goto out; 5774 } 5775 5776 /* Perform uRPF check if passed input interface */ 5777 ret = 0; 5778 rn = (struct radix_node *)ro.ro_rt; 5779 do { 5780 rt = (struct rtentry *)rn; 5781#ifndef __FreeBSD__ /* CARPDEV */ 5782 if (rt->rt_ifp->if_type == IFT_CARP) 5783 ifp = rt->rt_ifp->if_carpdev; 5784 else 5785#endif 5786 ifp = rt->rt_ifp; 5787 5788 if (kif->pfik_ifp == ifp) 5789 ret = 1; 5790#ifdef __FreeBSD__ 5791#ifdef RADIX_MPATH 5792 rn = rn_mpath_next(rn); 5793#endif 5794#else 5795 rn = rn_mpath_next(rn, 0); 5796#endif 5797 } while (check_mpath == 1 && rn != NULL && ret == 0); 5798 } else 5799 ret = 0; 5800out: 5801 if (ro.ro_rt != NULL) 5802 RTFREE(ro.ro_rt); 5803 return (ret); 5804} 5805 5806int 5807pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw, 5808 int rtableid) 5809{ 5810 struct sockaddr_in *dst; 5811#ifdef INET6 5812 struct sockaddr_in6 *dst6; 5813 struct route_in6 ro; 5814#else 5815 struct route ro; 5816#endif 5817 int ret = 0; 5818 5819 bzero(&ro, sizeof(ro)); 5820 switch (af) { 5821 case AF_INET: 5822 dst = satosin(&ro.ro_dst); 5823 dst->sin_family = AF_INET; 5824 dst->sin_len = sizeof(*dst); 5825 dst->sin_addr = addr->v4; 5826 break; 5827#ifdef INET6 5828 case AF_INET6: 5829 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5830 dst6->sin6_family = AF_INET6; 5831 dst6->sin6_len = sizeof(*dst6); 5832 dst6->sin6_addr = addr->v6; 5833 break; 5834#endif /* INET6 */ 5835 default: 5836 return (0); 5837 } 5838 5839#ifdef __FreeBSD__ 5840 switch (af) { 5841#ifdef INET6 5842 case AF_INET6: 5843 in6_rtalloc_ign(&ro, 0, rtableid); 5844 break; 5845#endif 5846#ifdef INET 5847 case AF_INET: 5848 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5849 break; 5850#endif 5851 default: 5852 rtalloc_ign((struct route *)&ro, 0); 5853 break; 5854 } 5855#else /* ! __FreeBSD__ */ 5856 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5857#endif 5858 5859 if (ro.ro_rt != NULL) { 5860#ifdef __FreeBSD__ 5861 /* XXX_IMPORT: later */ 5862#else 5863 if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 5864 ret = 1; 5865#endif 5866 RTFREE(ro.ro_rt); 5867 } 5868 5869 return (ret); 5870} 5871 5872#ifdef INET 5873void 5874pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5875 struct pf_state *s, struct pf_pdesc *pd) 5876{ 5877 struct mbuf *m0, *m1; 5878 struct route iproute; 5879 struct route *ro = NULL; 5880 struct sockaddr_in *dst; 5881 struct ip *ip; 5882 struct ifnet *ifp = NULL; 5883 struct pf_addr naddr; 5884 struct pf_src_node *sn = NULL; 5885 int error = 0; 5886#ifdef __FreeBSD__ 5887 int sw_csum; 5888#endif 5889#ifdef IPSEC 5890 struct m_tag *mtag; 5891#endif /* IPSEC */ 5892 5893 if (m == NULL || *m == NULL || r == NULL || 5894 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5895 panic("pf_route: invalid parameters"); 5896 5897#ifdef __FreeBSD__ 5898 if (pd->pf_mtag->routed++ > 3) { 5899#else 5900 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5901#endif 5902 m0 = *m; 5903 *m = NULL; 5904 goto bad; 5905 } 5906 5907 if (r->rt == PF_DUPTO) { 5908#ifdef __FreeBSD__ 5909 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 5910#else 5911 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5912#endif 5913 return; 5914 } else { 5915 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5916 return; 5917 m0 = *m; 5918 } 5919 5920 if (m0->m_len < sizeof(struct ip)) { 5921 DPFPRINTF(PF_DEBUG_URGENT, 5922 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5923 goto bad; 5924 } 5925 5926 ip = mtod(m0, struct ip *); 5927 5928 ro = &iproute; 5929 bzero((caddr_t)ro, sizeof(*ro)); 5930 dst = satosin(&ro->ro_dst); 5931 dst->sin_family = AF_INET; 5932 dst->sin_len = sizeof(*dst); 5933 dst->sin_addr = ip->ip_dst; 5934 5935 if (r->rt == PF_FASTROUTE) { 5936#ifdef __FreeBSD__ 5937 in_rtalloc_ign(ro, 0, M_GETFIB(m0)); 5938#else 5939 rtalloc(ro); 5940#endif 5941 if (ro->ro_rt == 0) { 5942#ifdef __FreeBSD__ 5943 KMOD_IPSTAT_INC(ips_noroute); 5944#else 5945 ipstat.ips_noroute++; 5946#endif 5947 goto bad; 5948 } 5949 5950 ifp = ro->ro_rt->rt_ifp; 5951 ro->ro_rt->rt_use++; 5952 5953 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 5954 dst = satosin(ro->ro_rt->rt_gateway); 5955 } else { 5956 if (TAILQ_EMPTY(&r->rpool.list)) { 5957 DPFPRINTF(PF_DEBUG_URGENT, 5958 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 5959 goto bad; 5960 } 5961 if (s == NULL) { 5962 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5963 &naddr, NULL, &sn); 5964 if (!PF_AZERO(&naddr, AF_INET)) 5965 dst->sin_addr.s_addr = naddr.v4.s_addr; 5966 ifp = r->rpool.cur->kif ? 5967 r->rpool.cur->kif->pfik_ifp : NULL; 5968 } else { 5969 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5970 dst->sin_addr.s_addr = 5971 s->rt_addr.v4.s_addr; 5972 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5973 } 5974 } 5975 if (ifp == NULL) 5976 goto bad; 5977 5978 if (oifp != ifp) { 5979#ifdef __FreeBSD__ 5980 PF_UNLOCK(); 5981 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 5982 PF_LOCK(); 5983 goto bad; 5984 } else if (m0 == NULL) { 5985 PF_LOCK(); 5986 goto done; 5987 } 5988 PF_LOCK(); 5989#else 5990 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5991 goto bad; 5992 else if (m0 == NULL) 5993 goto done; 5994#endif 5995 if (m0->m_len < sizeof(struct ip)) { 5996 DPFPRINTF(PF_DEBUG_URGENT, 5997 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5998 goto bad; 5999 } 6000 ip = mtod(m0, struct ip *); 6001 } 6002 6003#ifdef __FreeBSD__ 6004 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 6005 m0->m_pkthdr.csum_flags |= CSUM_IP; 6006 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 6007 if (sw_csum & CSUM_DELAY_DATA) { 6008 /* 6009 * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 6010 */ 6011 NTOHS(ip->ip_len); 6012 NTOHS(ip->ip_off); /* XXX: needed? */ 6013 in_delayed_cksum(m0); 6014 HTONS(ip->ip_len); 6015 HTONS(ip->ip_off); 6016 sw_csum &= ~CSUM_DELAY_DATA; 6017 } 6018 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 6019 6020 if (ntohs(ip->ip_len) <= ifp->if_mtu || 6021 (ifp->if_hwassist & CSUM_FRAGMENT && 6022 ((ip->ip_off & htons(IP_DF)) == 0))) { 6023 /* 6024 * ip->ip_len = htons(ip->ip_len); 6025 * ip->ip_off = htons(ip->ip_off); 6026 */ 6027 ip->ip_sum = 0; 6028 if (sw_csum & CSUM_DELAY_IP) { 6029 /* From KAME */ 6030 if (ip->ip_v == IPVERSION && 6031 (ip->ip_hl << 2) == sizeof(*ip)) { 6032 ip->ip_sum = in_cksum_hdr(ip); 6033 } else { 6034 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6035 } 6036 } 6037 PF_UNLOCK(); 6038 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro); 6039 PF_LOCK(); 6040 goto done; 6041 } 6042#else 6043 /* Copied from ip_output. */ 6044#ifdef IPSEC 6045 /* 6046 * If deferred crypto processing is needed, check that the 6047 * interface supports it. 6048 */ 6049 if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 6050 != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 6051 /* Notify IPsec to do its own crypto. */ 6052 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 6053 goto bad; 6054 } 6055#endif /* IPSEC */ 6056 6057 /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 6058 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 6059 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 6060 ifp->if_bridge != NULL) { 6061 in_delayed_cksum(m0); 6062 m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clr */ 6063 } 6064 } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 6065 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 6066 ifp->if_bridge != NULL) { 6067 in_delayed_cksum(m0); 6068 m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clr */ 6069 } 6070 } 6071 6072 if (ntohs(ip->ip_len) <= ifp->if_mtu) { 6073 ip->ip_sum = 0; 6074 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 6075 ifp->if_bridge == NULL) { 6076 m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 6077#ifdef __FreeBSD__ 6078 KMOD_IPSTAT_INC(ips_outhwcsum); 6079#else 6080 ipstat.ips_outhwcsum++; 6081#endif 6082 } else 6083 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6084 /* Update relevant hardware checksum stats for TCP/UDP */ 6085 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 6086 KMOD_TCPSTAT_INC(tcps_outhwcsum); 6087 else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 6088 KMOD_UDPSTAT_INC(udps_outhwcsum); 6089 error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 6090 goto done; 6091 } 6092#endif 6093 6094 /* 6095 * Too large for interface; fragment if possible. 6096 * Must be able to put at least 8 bytes per fragment. 6097 */ 6098 if (ip->ip_off & htons(IP_DF)) { 6099#ifdef __FreeBSD__ 6100 KMOD_IPSTAT_INC(ips_cantfrag); 6101#else 6102 ipstat.ips_cantfrag++; 6103#endif 6104 if (r->rt != PF_DUPTO) { 6105#ifdef __FreeBSD__ 6106 /* icmp_error() expects host byte ordering */ 6107 NTOHS(ip->ip_len); 6108 NTOHS(ip->ip_off); 6109 PF_UNLOCK(); 6110 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6111 ifp->if_mtu); 6112 PF_LOCK(); 6113#else 6114 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6115 ifp->if_mtu); 6116#endif 6117 goto done; 6118 } else 6119 goto bad; 6120 } 6121 6122 m1 = m0; 6123#ifdef __FreeBSD__ 6124 /* 6125 * XXX: is cheaper + less error prone than own function 6126 */ 6127 NTOHS(ip->ip_len); 6128 NTOHS(ip->ip_off); 6129 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 6130#else 6131 error = ip_fragment(m0, ifp, ifp->if_mtu); 6132#endif 6133 if (error) { 6134#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 6135 m0 = NULL; 6136#endif 6137 goto bad; 6138 } 6139 6140 for (m0 = m1; m0; m0 = m1) { 6141 m1 = m0->m_nextpkt; 6142 m0->m_nextpkt = 0; 6143#ifdef __FreeBSD__ 6144 if (error == 0) { 6145 PF_UNLOCK(); 6146 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6147 NULL); 6148 PF_LOCK(); 6149 } else 6150#else 6151 if (error == 0) 6152 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6153 NULL); 6154 else 6155#endif 6156 m_freem(m0); 6157 } 6158 6159 if (error == 0) 6160#ifdef __FreeBSD__ 6161 KMOD_IPSTAT_INC(ips_fragmented); 6162#else 6163 ipstat.ips_fragmented++; 6164#endif 6165 6166done: 6167 if (r->rt != PF_DUPTO) 6168 *m = NULL; 6169 if (ro == &iproute && ro->ro_rt) 6170 RTFREE(ro->ro_rt); 6171 return; 6172 6173bad: 6174 m_freem(m0); 6175 goto done; 6176} 6177#endif /* INET */ 6178 6179#ifdef INET6 6180void 6181pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6182 struct pf_state *s, struct pf_pdesc *pd) 6183{ 6184 struct mbuf *m0; 6185 struct route_in6 ip6route; 6186 struct route_in6 *ro; 6187 struct sockaddr_in6 *dst; 6188 struct ip6_hdr *ip6; 6189 struct ifnet *ifp = NULL; 6190 struct pf_addr naddr; 6191 struct pf_src_node *sn = NULL; 6192 6193 if (m == NULL || *m == NULL || r == NULL || 6194 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6195 panic("pf_route6: invalid parameters"); 6196 6197#ifdef __FreeBSD__ 6198 if (pd->pf_mtag->routed++ > 3) { 6199#else 6200 if ((*m)->m_pkthdr.pf.routed++ > 3) { 6201#endif 6202 m0 = *m; 6203 *m = NULL; 6204 goto bad; 6205 } 6206 6207 if (r->rt == PF_DUPTO) { 6208#ifdef __FreeBSD__ 6209 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6210#else 6211 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6212#endif 6213 return; 6214 } else { 6215 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6216 return; 6217 m0 = *m; 6218 } 6219 6220 if (m0->m_len < sizeof(struct ip6_hdr)) { 6221 DPFPRINTF(PF_DEBUG_URGENT, 6222 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6223 goto bad; 6224 } 6225 ip6 = mtod(m0, struct ip6_hdr *); 6226 6227 ro = &ip6route; 6228 bzero((caddr_t)ro, sizeof(*ro)); 6229 dst = (struct sockaddr_in6 *)&ro->ro_dst; 6230 dst->sin6_family = AF_INET6; 6231 dst->sin6_len = sizeof(*dst); 6232 dst->sin6_addr = ip6->ip6_dst; 6233 6234 /* Cheat. XXX why only in the v6 case??? */ 6235 if (r->rt == PF_FASTROUTE) { 6236#ifdef __FreeBSD__ 6237 m0->m_flags |= M_SKIP_FIREWALL; 6238 PF_UNLOCK(); 6239 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6240#else 6241 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 6242 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6243#endif 6244 return; 6245 } 6246 6247 if (TAILQ_EMPTY(&r->rpool.list)) { 6248 DPFPRINTF(PF_DEBUG_URGENT, 6249 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6250 goto bad; 6251 } 6252 if (s == NULL) { 6253 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6254 &naddr, NULL, &sn); 6255 if (!PF_AZERO(&naddr, AF_INET6)) 6256 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6257 &naddr, AF_INET6); 6258 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6259 } else { 6260 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6261 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6262 &s->rt_addr, AF_INET6); 6263 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6264 } 6265 if (ifp == NULL) 6266 goto bad; 6267 6268 if (oifp != ifp) { 6269#ifdef __FreeBSD__ 6270 PF_UNLOCK(); 6271 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6272 PF_LOCK(); 6273 goto bad; 6274 } else if (m0 == NULL) { 6275 PF_LOCK(); 6276 goto done; 6277 } 6278 PF_LOCK(); 6279#else 6280 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6281 goto bad; 6282 else if (m0 == NULL) 6283 goto done; 6284#endif 6285 if (m0->m_len < sizeof(struct ip6_hdr)) { 6286 DPFPRINTF(PF_DEBUG_URGENT, 6287 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6288 goto bad; 6289 } 6290 ip6 = mtod(m0, struct ip6_hdr *); 6291 } 6292 6293 /* 6294 * If the packet is too large for the outgoing interface, 6295 * send back an icmp6 error. 6296 */ 6297 if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr)) 6298 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6299 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6300#ifdef __FreeBSD__ 6301 PF_UNLOCK(); 6302#endif 6303 nd6_output(ifp, ifp, m0, dst, NULL); 6304#ifdef __FreeBSD__ 6305 PF_LOCK(); 6306#endif 6307 } else { 6308 in6_ifstat_inc(ifp, ifs6_in_toobig); 6309#ifdef __FreeBSD__ 6310 if (r->rt != PF_DUPTO) { 6311 PF_UNLOCK(); 6312 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6313 PF_LOCK(); 6314 } else 6315#else 6316 if (r->rt != PF_DUPTO) 6317 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6318 else 6319#endif 6320 goto bad; 6321 } 6322 6323done: 6324 if (r->rt != PF_DUPTO) 6325 *m = NULL; 6326 return; 6327 6328bad: 6329 m_freem(m0); 6330 goto done; 6331} 6332#endif /* INET6 */ 6333 6334#ifdef __FreeBSD__ 6335/* 6336 * FreeBSD supports cksum offloads for the following drivers. 6337 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6338 * ti(4), txp(4), xl(4) 6339 * 6340 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6341 * network driver performed cksum including pseudo header, need to verify 6342 * csum_data 6343 * CSUM_DATA_VALID : 6344 * network driver performed cksum, needs to additional pseudo header 6345 * cksum computation with partial csum_data(i.e. lack of H/W support for 6346 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6347 * 6348 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6349 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6350 * TCP/UDP layer. 6351 * Also, set csum_data to 0xffff to force cksum validation. 6352 */ 6353int 6354pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6355{ 6356 u_int16_t sum = 0; 6357 int hw_assist = 0; 6358 struct ip *ip; 6359 6360 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6361 return (1); 6362 if (m->m_pkthdr.len < off + len) 6363 return (1); 6364 6365 switch (p) { 6366 case IPPROTO_TCP: 6367 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6368 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6369 sum = m->m_pkthdr.csum_data; 6370 } else { 6371 ip = mtod(m, struct ip *); 6372 sum = in_pseudo(ip->ip_src.s_addr, 6373 ip->ip_dst.s_addr, htonl((u_short)len + 6374 m->m_pkthdr.csum_data + IPPROTO_TCP)); 6375 } 6376 sum ^= 0xffff; 6377 ++hw_assist; 6378 } 6379 break; 6380 case IPPROTO_UDP: 6381 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6382 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6383 sum = m->m_pkthdr.csum_data; 6384 } else { 6385 ip = mtod(m, struct ip *); 6386 sum = in_pseudo(ip->ip_src.s_addr, 6387 ip->ip_dst.s_addr, htonl((u_short)len + 6388 m->m_pkthdr.csum_data + IPPROTO_UDP)); 6389 } 6390 sum ^= 0xffff; 6391 ++hw_assist; 6392 } 6393 break; 6394 case IPPROTO_ICMP: 6395#ifdef INET6 6396 case IPPROTO_ICMPV6: 6397#endif /* INET6 */ 6398 break; 6399 default: 6400 return (1); 6401 } 6402 6403 if (!hw_assist) { 6404 switch (af) { 6405 case AF_INET: 6406 if (p == IPPROTO_ICMP) { 6407 if (m->m_len < off) 6408 return (1); 6409 m->m_data += off; 6410 m->m_len -= off; 6411 sum = in_cksum(m, len); 6412 m->m_data -= off; 6413 m->m_len += off; 6414 } else { 6415 if (m->m_len < sizeof(struct ip)) 6416 return (1); 6417 sum = in4_cksum(m, p, off, len); 6418 } 6419 break; 6420#ifdef INET6 6421 case AF_INET6: 6422 if (m->m_len < sizeof(struct ip6_hdr)) 6423 return (1); 6424 sum = in6_cksum(m, p, off, len); 6425 break; 6426#endif /* INET6 */ 6427 default: 6428 return (1); 6429 } 6430 } 6431 if (sum) { 6432 switch (p) { 6433 case IPPROTO_TCP: 6434 { 6435 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 6436 break; 6437 } 6438 case IPPROTO_UDP: 6439 { 6440 KMOD_UDPSTAT_INC(udps_badsum); 6441 break; 6442 } 6443#ifdef INET 6444 case IPPROTO_ICMP: 6445 { 6446 KMOD_ICMPSTAT_INC(icps_checksum); 6447 break; 6448 } 6449#endif 6450#ifdef INET6 6451 case IPPROTO_ICMPV6: 6452 { 6453 KMOD_ICMP6STAT_INC(icp6s_checksum); 6454 break; 6455 } 6456#endif /* INET6 */ 6457 } 6458 return (1); 6459 } else { 6460 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6461 m->m_pkthdr.csum_flags |= 6462 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6463 m->m_pkthdr.csum_data = 0xffff; 6464 } 6465 } 6466 return (0); 6467} 6468#else /* !__FreeBSD__ */ 6469 6470/* 6471 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6472 * off is the offset where the protocol header starts 6473 * len is the total length of protocol header plus payload 6474 * returns 0 when the checksum is valid, otherwise returns 1. 6475 */ 6476int 6477pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6478 sa_family_t af) 6479{ 6480 u_int16_t flag_ok, flag_bad; 6481 u_int16_t sum; 6482 6483 switch (p) { 6484 case IPPROTO_TCP: 6485 flag_ok = M_TCP_CSUM_IN_OK; 6486 flag_bad = M_TCP_CSUM_IN_BAD; 6487 break; 6488 case IPPROTO_UDP: 6489 flag_ok = M_UDP_CSUM_IN_OK; 6490 flag_bad = M_UDP_CSUM_IN_BAD; 6491 break; 6492 case IPPROTO_ICMP: 6493#ifdef INET6 6494 case IPPROTO_ICMPV6: 6495#endif /* INET6 */ 6496 flag_ok = flag_bad = 0; 6497 break; 6498 default: 6499 return (1); 6500 } 6501 if (m->m_pkthdr.csum_flags & flag_ok) 6502 return (0); 6503 if (m->m_pkthdr.csum_flags & flag_bad) 6504 return (1); 6505 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6506 return (1); 6507 if (m->m_pkthdr.len < off + len) 6508 return (1); 6509 switch (af) { 6510#ifdef INET 6511 case AF_INET: 6512 if (p == IPPROTO_ICMP) { 6513 if (m->m_len < off) 6514 return (1); 6515 m->m_data += off; 6516 m->m_len -= off; 6517 sum = in_cksum(m, len); 6518 m->m_data -= off; 6519 m->m_len += off; 6520 } else { 6521 if (m->m_len < sizeof(struct ip)) 6522 return (1); 6523 sum = in4_cksum(m, p, off, len); 6524 } 6525 break; 6526#endif /* INET */ 6527#ifdef INET6 6528 case AF_INET6: 6529 if (m->m_len < sizeof(struct ip6_hdr)) 6530 return (1); 6531 sum = in6_cksum(m, p, off, len); 6532 break; 6533#endif /* INET6 */ 6534 default: 6535 return (1); 6536 } 6537 if (sum) { 6538 m->m_pkthdr.csum_flags |= flag_bad; 6539 switch (p) { 6540 case IPPROTO_TCP: 6541 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 6542 break; 6543 case IPPROTO_UDP: 6544 KMOD_UDPSTAT_INC(udps_badsum); 6545 break; 6546#ifdef INET 6547 case IPPROTO_ICMP: 6548 KMOD_ICMPSTAT_INC(icps_checksum); 6549 break; 6550#endif 6551#ifdef INET6 6552 case IPPROTO_ICMPV6: 6553 KMOD_ICMP6STAT_INC(icp6s_checksum); 6554 break; 6555#endif /* INET6 */ 6556 } 6557 return (1); 6558 } 6559 m->m_pkthdr.csum_flags |= flag_ok; 6560 return (0); 6561} 6562#endif 6563 6564#ifndef __FreeBSD__ 6565struct pf_divert * 6566pf_find_divert(struct mbuf *m) 6567{ 6568 struct m_tag *mtag; 6569 6570 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) 6571 return (NULL); 6572 6573 return ((struct pf_divert *)(mtag + 1)); 6574} 6575 6576struct pf_divert * 6577pf_get_divert(struct mbuf *m) 6578{ 6579 struct m_tag *mtag; 6580 6581 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) { 6582 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert), 6583 M_NOWAIT); 6584 if (mtag == NULL) 6585 return (NULL); 6586 bzero(mtag + 1, sizeof(struct pf_divert)); 6587 m_tag_prepend(m, mtag); 6588 } 6589 6590 return ((struct pf_divert *)(mtag + 1)); 6591} 6592#endif 6593 6594#ifdef INET 6595int 6596#ifdef __FreeBSD__ 6597pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6598 struct ether_header *eh, struct inpcb *inp) 6599#else 6600pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6601 struct ether_header *eh) 6602#endif 6603{ 6604 struct pfi_kif *kif; 6605 u_short action, reason = 0, log = 0; 6606 struct mbuf *m = *m0; 6607#ifdef __FreeBSD__ 6608 struct ip *h = NULL; 6609 struct m_tag *ipfwtag; 6610 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6611#else 6612 struct ip *h; 6613 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6614#endif 6615 struct pf_state *s = NULL; 6616 struct pf_ruleset *ruleset = NULL; 6617 struct pf_pdesc pd; 6618 int off, dirndx, pqid = 0; 6619 6620#ifdef __FreeBSD__ 6621 PF_LOCK(); 6622 if (!V_pf_status.running) 6623 { 6624 PF_UNLOCK(); 6625 return (PF_PASS); 6626 } 6627#else 6628 if (!pf_status.running) 6629 return (PF_PASS); 6630#endif 6631 6632 memset(&pd, 0, sizeof(pd)); 6633#ifdef __FreeBSD__ 6634 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 6635 PF_UNLOCK(); 6636 DPFPRINTF(PF_DEBUG_URGENT, 6637 ("pf_test: pf_get_mtag returned NULL\n")); 6638 return (PF_DROP); 6639 } 6640#endif 6641#ifndef __FreeBSD__ 6642 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6643 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6644 else 6645#endif 6646 kif = (struct pfi_kif *)ifp->if_pf_kif; 6647 6648 if (kif == NULL) { 6649#ifdef __FreeBSD__ 6650 PF_UNLOCK(); 6651#endif 6652 DPFPRINTF(PF_DEBUG_URGENT, 6653 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6654 return (PF_DROP); 6655 } 6656 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6657#ifdef __FreeBSD__ 6658 { 6659 PF_UNLOCK(); 6660#endif 6661 return (PF_PASS); 6662#ifdef __FreeBSD__ 6663 } 6664#endif 6665 6666#ifdef __FreeBSD__ 6667 M_ASSERTPKTHDR(m); 6668#else 6669#ifdef DIAGNOSTIC 6670 if ((m->m_flags & M_PKTHDR) == 0) 6671 panic("non-M_PKTHDR is passed to pf_test"); 6672#endif /* DIAGNOSTIC */ 6673#endif 6674 6675 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6676 action = PF_DROP; 6677 REASON_SET(&reason, PFRES_SHORT); 6678 log = 1; 6679 goto done; 6680 } 6681 6682#ifdef __FreeBSD__ 6683 if (m->m_flags & M_SKIP_FIREWALL) { 6684 PF_UNLOCK(); 6685 return (PF_PASS); 6686 } 6687#else 6688 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 6689 return (PF_PASS); 6690#endif 6691 6692#ifdef __FreeBSD__ 6693 if (ip_divert_ptr != NULL && 6694 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 6695 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 6696 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 6697 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 6698 m_tag_delete(m, ipfwtag); 6699 } 6700 if (pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 6701 m->m_flags |= M_FASTFWD_OURS; 6702 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 6703 } 6704 } else 6705#endif 6706 /* We do IP header normalization and packet reassembly here */ 6707 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6708 action = PF_DROP; 6709 goto done; 6710 } 6711 m = *m0; /* pf_normalize messes with m0 */ 6712 h = mtod(m, struct ip *); 6713 6714 off = h->ip_hl << 2; 6715 if (off < (int)sizeof(*h)) { 6716 action = PF_DROP; 6717 REASON_SET(&reason, PFRES_SHORT); 6718 log = 1; 6719 goto done; 6720 } 6721 6722 pd.src = (struct pf_addr *)&h->ip_src; 6723 pd.dst = (struct pf_addr *)&h->ip_dst; 6724 pd.sport = pd.dport = NULL; 6725 pd.ip_sum = &h->ip_sum; 6726 pd.proto_sum = NULL; 6727 pd.proto = h->ip_p; 6728 pd.dir = dir; 6729 pd.sidx = (dir == PF_IN) ? 0 : 1; 6730 pd.didx = (dir == PF_IN) ? 1 : 0; 6731 pd.af = AF_INET; 6732 pd.tos = h->ip_tos; 6733 pd.tot_len = ntohs(h->ip_len); 6734 pd.eh = eh; 6735 6736 /* handle fragments that didn't get reassembled by normalization */ 6737 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 6738 action = pf_test_fragment(&r, dir, kif, m, h, 6739 &pd, &a, &ruleset); 6740 goto done; 6741 } 6742 6743 switch (h->ip_p) { 6744 6745 case IPPROTO_TCP: { 6746 struct tcphdr th; 6747 6748 pd.hdr.tcp = &th; 6749 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6750 &action, &reason, AF_INET)) { 6751 log = action != PF_PASS; 6752 goto done; 6753 } 6754 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6755 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6756 pqid = 1; 6757 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6758 if (action == PF_DROP) 6759 goto done; 6760 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6761 &reason); 6762 if (action == PF_PASS) { 6763#if NPFSYNC > 0 6764#ifdef __FreeBSD__ 6765 if (pfsync_update_state_ptr != NULL) 6766 pfsync_update_state_ptr(s); 6767#else 6768 pfsync_update_state(s); 6769#endif 6770#endif /* NPFSYNC */ 6771 r = s->rule.ptr; 6772 a = s->anchor.ptr; 6773 log = s->log; 6774 } else if (s == NULL) 6775#ifdef __FreeBSD__ 6776 action = pf_test_rule(&r, &s, dir, kif, 6777 m, off, h, &pd, &a, &ruleset, NULL, inp); 6778#else 6779 action = pf_test_rule(&r, &s, dir, kif, 6780 m, off, h, &pd, &a, &ruleset, &ipintrq); 6781#endif 6782 break; 6783 } 6784 6785 case IPPROTO_UDP: { 6786 struct udphdr uh; 6787 6788 pd.hdr.udp = &uh; 6789 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6790 &action, &reason, AF_INET)) { 6791 log = action != PF_PASS; 6792 goto done; 6793 } 6794 if (uh.uh_dport == 0 || 6795 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6796 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6797 action = PF_DROP; 6798 REASON_SET(&reason, PFRES_SHORT); 6799 goto done; 6800 } 6801 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6802 if (action == PF_PASS) { 6803#if NPFSYNC > 0 6804#ifdef __FreeBSD__ 6805 if (pfsync_update_state_ptr != NULL) 6806 pfsync_update_state_ptr(s); 6807#else 6808 pfsync_update_state(s); 6809#endif 6810#endif /* NPFSYNC */ 6811 r = s->rule.ptr; 6812 a = s->anchor.ptr; 6813 log = s->log; 6814 } else if (s == NULL) 6815#ifdef __FreeBSD__ 6816 action = pf_test_rule(&r, &s, dir, kif, 6817 m, off, h, &pd, &a, &ruleset, NULL, inp); 6818#else 6819 action = pf_test_rule(&r, &s, dir, kif, 6820 m, off, h, &pd, &a, &ruleset, &ipintrq); 6821#endif 6822 break; 6823 } 6824 6825 case IPPROTO_ICMP: { 6826 struct icmp ih; 6827 6828 pd.hdr.icmp = &ih; 6829 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6830 &action, &reason, AF_INET)) { 6831 log = action != PF_PASS; 6832 goto done; 6833 } 6834 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6835 &reason); 6836 if (action == PF_PASS) { 6837#if NPFSYNC > 0 6838#ifdef __FreeBSD__ 6839 if (pfsync_update_state_ptr != NULL) 6840 pfsync_update_state_ptr(s); 6841#else 6842 pfsync_update_state(s); 6843#endif 6844#endif /* NPFSYNC */ 6845 r = s->rule.ptr; 6846 a = s->anchor.ptr; 6847 log = s->log; 6848 } else if (s == NULL) 6849#ifdef __FreeBSD__ 6850 action = pf_test_rule(&r, &s, dir, kif, 6851 m, off, h, &pd, &a, &ruleset, NULL, inp); 6852#else 6853 action = pf_test_rule(&r, &s, dir, kif, 6854 m, off, h, &pd, &a, &ruleset, &ipintrq); 6855#endif 6856 break; 6857 } 6858 6859#ifdef INET6 6860 case IPPROTO_ICMPV6: { 6861 action = PF_DROP; 6862 DPFPRINTF(PF_DEBUG_MISC, 6863 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 6864 goto done; 6865 } 6866#endif 6867 6868 default: 6869 action = pf_test_state_other(&s, dir, kif, m, &pd); 6870 if (action == PF_PASS) { 6871#if NPFSYNC > 0 6872#ifdef __FreeBSD__ 6873 if (pfsync_update_state_ptr != NULL) 6874 pfsync_update_state_ptr(s); 6875#else 6876 pfsync_update_state(s); 6877#endif 6878#endif /* NPFSYNC */ 6879 r = s->rule.ptr; 6880 a = s->anchor.ptr; 6881 log = s->log; 6882 } else if (s == NULL) 6883#ifdef __FreeBSD__ 6884 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6885 &pd, &a, &ruleset, NULL, inp); 6886#else 6887 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6888 &pd, &a, &ruleset, &ipintrq); 6889#endif 6890 break; 6891 } 6892 6893done: 6894 if (action == PF_PASS && h->ip_hl > 5 && 6895 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6896 action = PF_DROP; 6897 REASON_SET(&reason, PFRES_IPOPTIONS); 6898 log = 1; 6899 DPFPRINTF(PF_DEBUG_MISC, 6900 ("pf: dropping packet with ip options\n")); 6901 } 6902 6903 if ((s && s->tag) || r->rtableid >= 0) 6904#ifdef __FreeBSD__ 6905 pf_tag_packet(m, s ? s->tag : 0, r->rtableid, pd.pf_mtag); 6906#else 6907 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6908#endif 6909 6910 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 6911#ifdef __FreeBSD__ 6912 pd.pf_mtag->statekey = s->key[PF_SK_STACK]; 6913#else 6914 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 6915#endif 6916 6917#ifdef ALTQ 6918 if (action == PF_PASS && r->qid) { 6919#ifdef __FreeBSD__ 6920 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6921 pd.pf_mtag->qid = r->pqid; 6922 else 6923 pd.pf_mtag->qid = r->qid; 6924 /* add hints for ecn */ 6925 pd.pf_mtag->hdr = h; 6926 6927#else 6928 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6929 m->m_pkthdr.pf.qid = r->pqid; 6930 else 6931 m->m_pkthdr.pf.qid = r->qid; 6932 /* add hints for ecn */ 6933 m->m_pkthdr.pf.hdr = h; 6934#endif 6935 } 6936#endif /* ALTQ */ 6937 6938 /* 6939 * connections redirected to loopback should not match sockets 6940 * bound specifically to loopback due to security implications, 6941 * see tcp_input() and in_pcblookup_listen(). 6942 */ 6943 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6944 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6945 (s->nat_rule.ptr->action == PF_RDR || 6946 s->nat_rule.ptr->action == PF_BINAT) && 6947 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 6948#ifdef __FreeBSD__ 6949 m->m_flags |= M_SKIP_FIREWALL; 6950#else 6951 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 6952#endif 6953 6954#ifdef __FreeBSD__ 6955 if (action == PF_PASS && r->divert.port && 6956 ip_divert_ptr != NULL && !PACKET_LOOPED()) { 6957 6958 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 6959 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 6960 if (ipfwtag != NULL) { 6961 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 6962 ntohs(r->divert.port); 6963 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 6964 6965 m_tag_prepend(m, ipfwtag); 6966 6967 PF_UNLOCK(); 6968 6969 if (m->m_flags & M_FASTFWD_OURS) { 6970 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; 6971 m->m_flags &= ~M_FASTFWD_OURS; 6972 } 6973 6974 ip_divert_ptr(*m0, 6975 dir == PF_IN ? DIR_IN : DIR_OUT); 6976 *m0 = NULL; 6977 return (action); 6978 } else { 6979 /* XXX: ipfw has the same behaviour! */ 6980 action = PF_DROP; 6981 REASON_SET(&reason, PFRES_MEMORY); 6982 log = 1; 6983 DPFPRINTF(PF_DEBUG_MISC, 6984 ("pf: failed to allocate divert tag\n")); 6985 } 6986 } 6987#else 6988 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 6989 struct pf_divert *divert; 6990 6991 if ((divert = pf_get_divert(m))) { 6992 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 6993 divert->port = r->divert.port; 6994 divert->addr.ipv4 = r->divert.addr.v4; 6995 } 6996 } 6997#endif 6998 6999 if (log) { 7000 struct pf_rule *lr; 7001 7002 if (s != NULL && s->nat_rule.ptr != NULL && 7003 s->nat_rule.ptr->log & PF_LOG_ALL) 7004 lr = s->nat_rule.ptr; 7005 else 7006 lr = r; 7007 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 7008 &pd); 7009 } 7010 7011 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7012 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 7013 7014 if (action == PF_PASS || r->action == PF_DROP) { 7015 dirndx = (dir == PF_OUT); 7016 r->packets[dirndx]++; 7017 r->bytes[dirndx] += pd.tot_len; 7018 if (a != NULL) { 7019 a->packets[dirndx]++; 7020 a->bytes[dirndx] += pd.tot_len; 7021 } 7022 if (s != NULL) { 7023 if (s->nat_rule.ptr != NULL) { 7024 s->nat_rule.ptr->packets[dirndx]++; 7025 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7026 } 7027 if (s->src_node != NULL) { 7028 s->src_node->packets[dirndx]++; 7029 s->src_node->bytes[dirndx] += pd.tot_len; 7030 } 7031 if (s->nat_src_node != NULL) { 7032 s->nat_src_node->packets[dirndx]++; 7033 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7034 } 7035 dirndx = (dir == s->direction) ? 0 : 1; 7036 s->packets[dirndx]++; 7037 s->bytes[dirndx] += pd.tot_len; 7038 } 7039 tr = r; 7040 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7041#ifdef __FreeBSD__ 7042 if (nr != NULL && r == &V_pf_default_rule) 7043#else 7044 if (nr != NULL && r == &pf_default_rule) 7045#endif 7046 tr = nr; 7047 if (tr->src.addr.type == PF_ADDR_TABLE) 7048 pfr_update_stats(tr->src.addr.p.tbl, 7049 (s == NULL) ? pd.src : 7050 &s->key[(s->direction == PF_IN)]-> 7051 addr[(s->direction == PF_OUT)], 7052 pd.af, pd.tot_len, dir == PF_OUT, 7053 r->action == PF_PASS, tr->src.neg); 7054 if (tr->dst.addr.type == PF_ADDR_TABLE) 7055 pfr_update_stats(tr->dst.addr.p.tbl, 7056 (s == NULL) ? pd.dst : 7057 &s->key[(s->direction == PF_IN)]-> 7058 addr[(s->direction == PF_IN)], 7059 pd.af, pd.tot_len, dir == PF_OUT, 7060 r->action == PF_PASS, tr->dst.neg); 7061 } 7062 7063 switch (action) { 7064 case PF_SYNPROXY_DROP: 7065 m_freem(*m0); 7066 case PF_DEFER: 7067 *m0 = NULL; 7068 action = PF_PASS; 7069 break; 7070 default: 7071 /* pf_route can free the mbuf causing *m0 to become NULL */ 7072 if (r->rt) 7073 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 7074 break; 7075 } 7076#ifdef __FreeBSD__ 7077 PF_UNLOCK(); 7078#endif 7079 return (action); 7080} 7081#endif /* INET */ 7082 7083#ifdef INET6 7084int 7085#ifdef __FreeBSD__ 7086pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7087 struct ether_header *eh, struct inpcb *inp) 7088#else 7089pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7090 struct ether_header *eh) 7091#endif 7092{ 7093 struct pfi_kif *kif; 7094 u_short action, reason = 0, log = 0; 7095 struct mbuf *m = *m0, *n = NULL; 7096#ifdef __FreeBSD__ 7097 struct ip6_hdr *h = NULL; 7098 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 7099#else 7100 struct ip6_hdr *h; 7101 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 7102#endif 7103 struct pf_state *s = NULL; 7104 struct pf_ruleset *ruleset = NULL; 7105 struct pf_pdesc pd; 7106 int off, terminal = 0, dirndx, rh_cnt = 0; 7107 7108#ifdef __FreeBSD__ 7109 PF_LOCK(); 7110 if (!V_pf_status.running) { 7111 PF_UNLOCK(); 7112 return (PF_PASS); 7113 } 7114#else 7115 if (!pf_status.running) 7116 return (PF_PASS); 7117#endif 7118 7119 memset(&pd, 0, sizeof(pd)); 7120#ifdef __FreeBSD__ 7121 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 7122 PF_UNLOCK(); 7123 DPFPRINTF(PF_DEBUG_URGENT, 7124 ("pf_test: pf_get_mtag returned NULL\n")); 7125 return (PF_DROP); 7126 } 7127#endif 7128#ifndef __FreeBSD__ 7129 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 7130 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 7131 else 7132#endif 7133 kif = (struct pfi_kif *)ifp->if_pf_kif; 7134 7135 if (kif == NULL) { 7136#ifdef __FreeBSD__ 7137 PF_UNLOCK(); 7138#endif 7139 DPFPRINTF(PF_DEBUG_URGENT, 7140 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 7141 return (PF_DROP); 7142 } 7143 if (kif->pfik_flags & PFI_IFLAG_SKIP) 7144#ifdef __FreeBSD__ 7145 { 7146 PF_UNLOCK(); 7147#endif 7148 return (PF_PASS); 7149#ifdef __FreeBSD__ 7150 } 7151#endif 7152 7153#ifdef __FreeBSD__ 7154 M_ASSERTPKTHDR(m); 7155#else 7156#ifdef DIAGNOSTIC 7157 if ((m->m_flags & M_PKTHDR) == 0) 7158 panic("non-M_PKTHDR is passed to pf_test6"); 7159#endif /* DIAGNOSTIC */ 7160#endif 7161 7162 if (m->m_pkthdr.len < (int)sizeof(*h)) { 7163 action = PF_DROP; 7164 REASON_SET(&reason, PFRES_SHORT); 7165 log = 1; 7166 goto done; 7167 } 7168 7169#ifdef __FreeBSD__ 7170 if (pd.pf_mtag->flags & PF_TAG_GENERATED) { 7171 PF_UNLOCK(); 7172#else 7173 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 7174#endif 7175 return (PF_PASS); 7176#ifdef __FreeBSD__ 7177 } 7178#endif 7179 7180 /* We do IP header normalization and packet reassembly here */ 7181 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 7182 action = PF_DROP; 7183 goto done; 7184 } 7185 m = *m0; /* pf_normalize messes with m0 */ 7186 h = mtod(m, struct ip6_hdr *); 7187 7188#if 1 7189 /* 7190 * we do not support jumbogram yet. if we keep going, zero ip6_plen 7191 * will do something bad, so drop the packet for now. 7192 */ 7193 if (htons(h->ip6_plen) == 0) { 7194 action = PF_DROP; 7195 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 7196 goto done; 7197 } 7198#endif 7199 7200 pd.src = (struct pf_addr *)&h->ip6_src; 7201 pd.dst = (struct pf_addr *)&h->ip6_dst; 7202 pd.sport = pd.dport = NULL; 7203 pd.ip_sum = NULL; 7204 pd.proto_sum = NULL; 7205 pd.dir = dir; 7206 pd.sidx = (dir == PF_IN) ? 0 : 1; 7207 pd.didx = (dir == PF_IN) ? 1 : 0; 7208 pd.af = AF_INET6; 7209 pd.tos = 0; 7210 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 7211 pd.eh = eh; 7212 7213 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 7214 pd.proto = h->ip6_nxt; 7215 do { 7216 switch (pd.proto) { 7217 case IPPROTO_FRAGMENT: 7218 action = pf_test_fragment(&r, dir, kif, m, h, 7219 &pd, &a, &ruleset); 7220 if (action == PF_DROP) 7221 REASON_SET(&reason, PFRES_FRAG); 7222 goto done; 7223 case IPPROTO_ROUTING: { 7224 struct ip6_rthdr rthdr; 7225 7226 if (rh_cnt++) { 7227 DPFPRINTF(PF_DEBUG_MISC, 7228 ("pf: IPv6 more than one rthdr\n")); 7229 action = PF_DROP; 7230 REASON_SET(&reason, PFRES_IPOPTIONS); 7231 log = 1; 7232 goto done; 7233 } 7234 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 7235 &reason, pd.af)) { 7236 DPFPRINTF(PF_DEBUG_MISC, 7237 ("pf: IPv6 short rthdr\n")); 7238 action = PF_DROP; 7239 REASON_SET(&reason, PFRES_SHORT); 7240 log = 1; 7241 goto done; 7242 } 7243 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 7244 DPFPRINTF(PF_DEBUG_MISC, 7245 ("pf: IPv6 rthdr0\n")); 7246 action = PF_DROP; 7247 REASON_SET(&reason, PFRES_IPOPTIONS); 7248 log = 1; 7249 goto done; 7250 } 7251 /* FALLTHROUGH */ 7252 } 7253 case IPPROTO_AH: 7254 case IPPROTO_HOPOPTS: 7255 case IPPROTO_DSTOPTS: { 7256 /* get next header and header length */ 7257 struct ip6_ext opt6; 7258 7259 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 7260 NULL, &reason, pd.af)) { 7261 DPFPRINTF(PF_DEBUG_MISC, 7262 ("pf: IPv6 short opt\n")); 7263 action = PF_DROP; 7264 log = 1; 7265 goto done; 7266 } 7267 if (pd.proto == IPPROTO_AH) 7268 off += (opt6.ip6e_len + 2) * 4; 7269 else 7270 off += (opt6.ip6e_len + 1) * 8; 7271 pd.proto = opt6.ip6e_nxt; 7272 /* goto the next header */ 7273 break; 7274 } 7275 default: 7276 terminal++; 7277 break; 7278 } 7279 } while (!terminal); 7280 7281 /* if there's no routing header, use unmodified mbuf for checksumming */ 7282 if (!n) 7283 n = m; 7284 7285 switch (pd.proto) { 7286 7287 case IPPROTO_TCP: { 7288 struct tcphdr th; 7289 7290 pd.hdr.tcp = &th; 7291 if (!pf_pull_hdr(m, off, &th, sizeof(th), 7292 &action, &reason, AF_INET6)) { 7293 log = action != PF_PASS; 7294 goto done; 7295 } 7296 pd.p_len = pd.tot_len - off - (th.th_off << 2); 7297 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7298 if (action == PF_DROP) 7299 goto done; 7300 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7301 &reason); 7302 if (action == PF_PASS) { 7303#if NPFSYNC > 0 7304#ifdef __FreeBSD__ 7305 if (pfsync_update_state_ptr != NULL) 7306 pfsync_update_state_ptr(s); 7307#else 7308 pfsync_update_state(s); 7309#endif 7310#endif /* NPFSYNC */ 7311 r = s->rule.ptr; 7312 a = s->anchor.ptr; 7313 log = s->log; 7314 } else if (s == NULL) 7315#ifdef __FreeBSD__ 7316 action = pf_test_rule(&r, &s, dir, kif, 7317 m, off, h, &pd, &a, &ruleset, NULL, inp); 7318#else 7319 action = pf_test_rule(&r, &s, dir, kif, 7320 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7321#endif 7322 break; 7323 } 7324 7325 case IPPROTO_UDP: { 7326 struct udphdr uh; 7327 7328 pd.hdr.udp = &uh; 7329 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7330 &action, &reason, AF_INET6)) { 7331 log = action != PF_PASS; 7332 goto done; 7333 } 7334 if (uh.uh_dport == 0 || 7335 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7336 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7337 action = PF_DROP; 7338 REASON_SET(&reason, PFRES_SHORT); 7339 goto done; 7340 } 7341 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7342 if (action == PF_PASS) { 7343#if NPFSYNC > 0 7344#ifdef __FreeBSD__ 7345 if (pfsync_update_state_ptr != NULL) 7346 pfsync_update_state_ptr(s); 7347#else 7348 pfsync_update_state(s); 7349#endif 7350#endif /* NPFSYNC */ 7351 r = s->rule.ptr; 7352 a = s->anchor.ptr; 7353 log = s->log; 7354 } else if (s == NULL) 7355#ifdef __FreeBSD__ 7356 action = pf_test_rule(&r, &s, dir, kif, 7357 m, off, h, &pd, &a, &ruleset, NULL, inp); 7358#else 7359 action = pf_test_rule(&r, &s, dir, kif, 7360 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7361#endif 7362 break; 7363 } 7364 7365 case IPPROTO_ICMP: { 7366 action = PF_DROP; 7367 DPFPRINTF(PF_DEBUG_MISC, 7368 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 7369 goto done; 7370 } 7371 7372 case IPPROTO_ICMPV6: { 7373 struct icmp6_hdr ih; 7374 7375 pd.hdr.icmp6 = &ih; 7376 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 7377 &action, &reason, AF_INET6)) { 7378 log = action != PF_PASS; 7379 goto done; 7380 } 7381 action = pf_test_state_icmp(&s, dir, kif, 7382 m, off, h, &pd, &reason); 7383 if (action == PF_PASS) { 7384#if NPFSYNC > 0 7385#ifdef __FreeBSD__ 7386 if (pfsync_update_state_ptr != NULL) 7387 pfsync_update_state_ptr(s); 7388#else 7389 pfsync_update_state(s); 7390#endif 7391#endif /* NPFSYNC */ 7392 r = s->rule.ptr; 7393 a = s->anchor.ptr; 7394 log = s->log; 7395 } else if (s == NULL) 7396#ifdef __FreeBSD__ 7397 action = pf_test_rule(&r, &s, dir, kif, 7398 m, off, h, &pd, &a, &ruleset, NULL, inp); 7399#else 7400 action = pf_test_rule(&r, &s, dir, kif, 7401 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7402#endif 7403 break; 7404 } 7405 7406 default: 7407 action = pf_test_state_other(&s, dir, kif, m, &pd); 7408 if (action == PF_PASS) { 7409#if NPFSYNC > 0 7410#ifdef __FreeBSD__ 7411 if (pfsync_update_state_ptr != NULL) 7412 pfsync_update_state_ptr(s); 7413#else 7414 pfsync_update_state(s); 7415#endif 7416#endif /* NPFSYNC */ 7417 r = s->rule.ptr; 7418 a = s->anchor.ptr; 7419 log = s->log; 7420 } else if (s == NULL) 7421#ifdef __FreeBSD__ 7422 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 7423 &pd, &a, &ruleset, NULL, inp); 7424#else 7425 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 7426 &pd, &a, &ruleset, &ip6intrq); 7427#endif 7428 break; 7429 } 7430 7431done: 7432 if (n != m) { 7433 m_freem(n); 7434 n = NULL; 7435 } 7436 7437 /* handle dangerous IPv6 extension headers. */ 7438 if (action == PF_PASS && rh_cnt && 7439 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 7440 action = PF_DROP; 7441 REASON_SET(&reason, PFRES_IPOPTIONS); 7442 log = 1; 7443 DPFPRINTF(PF_DEBUG_MISC, 7444 ("pf: dropping packet with dangerous v6 headers\n")); 7445 } 7446 7447 if ((s && s->tag) || r->rtableid >= 0) 7448#ifdef __FreeBSD__ 7449 pf_tag_packet(m, s ? s->tag : 0, r->rtableid, pd.pf_mtag); 7450#else 7451 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 7452#endif 7453 7454 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 7455#ifdef __FreeBSD__ 7456 pd.pf_mtag->statekey = s->key[PF_SK_STACK]; 7457#else 7458 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 7459#endif 7460 7461#ifdef ALTQ 7462 if (action == PF_PASS && r->qid) { 7463#ifdef __FreeBSD__ 7464 if (pd.tos & IPTOS_LOWDELAY) 7465 pd.pf_mtag->qid = r->pqid; 7466 else 7467 pd.pf_mtag->qid = r->qid; 7468 /* add hints for ecn */ 7469 pd.pf_mtag->hdr = h; 7470#else 7471 if (pd.tos & IPTOS_LOWDELAY) 7472 m->m_pkthdr.pf.qid = r->pqid; 7473 else 7474 m->m_pkthdr.pf.qid = r->qid; 7475 /* add hints for ecn */ 7476 m->m_pkthdr.pf.hdr = h; 7477#endif 7478 } 7479#endif /* ALTQ */ 7480 7481 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7482 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7483 (s->nat_rule.ptr->action == PF_RDR || 7484 s->nat_rule.ptr->action == PF_BINAT) && 7485 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7486#ifdef __FreeBSD__ 7487 m->m_flags |= M_SKIP_FIREWALL; 7488#else 7489 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 7490#endif 7491 7492#ifdef __FreeBSD__ 7493 /* XXX: Anybody working on it?! */ 7494 if (r->divert.port) 7495 printf("pf: divert(9) is not supported for IPv6\n"); 7496#else 7497 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 7498 struct pf_divert *divert; 7499 7500 if ((divert = pf_get_divert(m))) { 7501 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 7502 divert->port = r->divert.port; 7503 divert->addr.ipv6 = r->divert.addr.v6; 7504 } 7505 } 7506#endif 7507 7508 if (log) { 7509 struct pf_rule *lr; 7510 7511 if (s != NULL && s->nat_rule.ptr != NULL && 7512 s->nat_rule.ptr->log & PF_LOG_ALL) 7513 lr = s->nat_rule.ptr; 7514 else 7515 lr = r; 7516 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 7517 &pd); 7518 } 7519 7520 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7521 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7522 7523 if (action == PF_PASS || r->action == PF_DROP) { 7524 dirndx = (dir == PF_OUT); 7525 r->packets[dirndx]++; 7526 r->bytes[dirndx] += pd.tot_len; 7527 if (a != NULL) { 7528 a->packets[dirndx]++; 7529 a->bytes[dirndx] += pd.tot_len; 7530 } 7531 if (s != NULL) { 7532 if (s->nat_rule.ptr != NULL) { 7533 s->nat_rule.ptr->packets[dirndx]++; 7534 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7535 } 7536 if (s->src_node != NULL) { 7537 s->src_node->packets[dirndx]++; 7538 s->src_node->bytes[dirndx] += pd.tot_len; 7539 } 7540 if (s->nat_src_node != NULL) { 7541 s->nat_src_node->packets[dirndx]++; 7542 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7543 } 7544 dirndx = (dir == s->direction) ? 0 : 1; 7545 s->packets[dirndx]++; 7546 s->bytes[dirndx] += pd.tot_len; 7547 } 7548 tr = r; 7549 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7550#ifdef __FreeBSD__ 7551 if (nr != NULL && r == &V_pf_default_rule) 7552#else 7553 if (nr != NULL && r == &pf_default_rule) 7554#endif 7555 tr = nr; 7556 if (tr->src.addr.type == PF_ADDR_TABLE) 7557 pfr_update_stats(tr->src.addr.p.tbl, 7558 (s == NULL) ? pd.src : 7559 &s->key[(s->direction == PF_IN)]->addr[0], 7560 pd.af, pd.tot_len, dir == PF_OUT, 7561 r->action == PF_PASS, tr->src.neg); 7562 if (tr->dst.addr.type == PF_ADDR_TABLE) 7563 pfr_update_stats(tr->dst.addr.p.tbl, 7564 (s == NULL) ? pd.dst : 7565 &s->key[(s->direction == PF_IN)]->addr[1], 7566 pd.af, pd.tot_len, dir == PF_OUT, 7567 r->action == PF_PASS, tr->dst.neg); 7568 } 7569 7570 switch (action) { 7571 case PF_SYNPROXY_DROP: 7572 m_freem(*m0); 7573 case PF_DEFER: 7574 *m0 = NULL; 7575 action = PF_PASS; 7576 break; 7577 default: 7578 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7579 if (r->rt) 7580 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 7581 break; 7582 } 7583 7584#ifdef __FreeBSD__ 7585 PF_UNLOCK(); 7586#endif 7587 return (action); 7588} 7589#endif /* INET6 */ 7590 7591int 7592pf_check_congestion(struct ifqueue *ifq) 7593{ 7594#ifdef __FreeBSD__ 7595 /* XXX_IMPORT: later */ 7596 return (0); 7597#else 7598 if (ifq->ifq_congestion) 7599 return (1); 7600 else 7601 return (0); 7602#endif 7603} 7604 7605/* 7606 * must be called whenever any addressing information such as 7607 * address, port, protocol has changed 7608 */ 7609void 7610pf_pkt_addr_changed(struct mbuf *m) 7611{ 7612#ifdef __FreeBSD__ 7613 struct pf_mtag *pf_tag; 7614 7615 if ((pf_tag = pf_find_mtag(m)) != NULL) 7616 pf_tag->statekey = NULL; 7617#else 7618 m->m_pkthdr.pf.statekey = NULL; 7619#endif 7620} 7621