pf.c revision 293896
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: releng/9.3/sys/contrib/pf/net/pf.c 293896 2016-01-14 09:11:26Z 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 <netpfil/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 mbuf *, 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 2010/** 2011 * Checksum updates are a little complicated because the checksum in the TCP/UDP 2012 * header isn't always a full checksum. In some cases (i.e. output) it's a 2013 * pseudo-header checksum, which is a partial checksum over src/dst IP 2014 * addresses, protocol number and length. 2015 * 2016 * That means we have the following cases: 2017 * * Input or forwarding: we don't have TSO, the checksum fields are full 2018 * checksums, we need to update the checksum whenever we change anything. 2019 * * Output (i.e. the checksum is a pseudo-header checksum): 2020 * x The field being updated is src/dst address or affects the length of 2021 * the packet. We need to update the pseudo-header checksum (note that this 2022 * checksum is not ones' complement). 2023 * x Some other field is being modified (e.g. src/dst port numbers): We 2024 * don't have to update anything. 2025 **/ 2026u_int16_t 2027pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2028{ 2029 u_int32_t l; 2030 2031 if (udp && !cksum) 2032 return (0x0000); 2033 l = cksum + old - new; 2034 l = (l >> 16) + (l & 65535); 2035 l = l & 65535; 2036 if (udp && !l) 2037 return (0xFFFF); 2038 return (l); 2039} 2040 2041u_int16_t 2042pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old, 2043 u_int16_t new, u_int8_t udp) 2044{ 2045 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2046 return (cksum); 2047 2048 return (pf_cksum_fixup(cksum, old, new, udp)); 2049} 2050 2051void 2052pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic, 2053 u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, 2054 sa_family_t af) 2055{ 2056 struct pf_addr ao; 2057 u_int16_t po = *p; 2058 2059 PF_ACPY(&ao, a, af); 2060 PF_ACPY(a, an, af); 2061 2062 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2063 *pc = ~*pc; 2064 2065 *p = pn; 2066 2067 switch (af) { 2068#ifdef INET 2069 case AF_INET: 2070 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2071 ao.addr16[0], an->addr16[0], 0), 2072 ao.addr16[1], an->addr16[1], 0); 2073 *p = pn; 2074 2075 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc, 2076 ao.addr16[0], an->addr16[0], u), 2077 ao.addr16[1], an->addr16[1], u); 2078 2079 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2080 break; 2081#endif /* INET */ 2082#ifdef INET6 2083 case AF_INET6: 2084 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2085 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2086 pf_cksum_fixup(pf_cksum_fixup(*pc, 2087 ao.addr16[0], an->addr16[0], u), 2088 ao.addr16[1], an->addr16[1], u), 2089 ao.addr16[2], an->addr16[2], u), 2090 ao.addr16[3], an->addr16[3], u), 2091 ao.addr16[4], an->addr16[4], u), 2092 ao.addr16[5], an->addr16[5], u), 2093 ao.addr16[6], an->addr16[6], u), 2094 ao.addr16[7], an->addr16[7], u); 2095 2096 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2097 break; 2098#endif /* INET6 */ 2099 } 2100 2101 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | 2102 CSUM_DELAY_DATA_IPV6)) { 2103 *pc = ~*pc; 2104 if (! *pc) 2105 *pc = 0xffff; 2106 } 2107} 2108 2109/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2110void 2111pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2112{ 2113 u_int32_t ao; 2114 2115 memcpy(&ao, a, sizeof(ao)); 2116 memcpy(a, &an, sizeof(u_int32_t)); 2117 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2118 ao % 65536, an % 65536, u); 2119} 2120 2121void 2122pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp) 2123{ 2124 u_int32_t ao; 2125 2126 memcpy(&ao, a, sizeof(ao)); 2127 memcpy(a, &an, sizeof(u_int32_t)); 2128 2129 *c = pf_proto_cksum_fixup(m, 2130 pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp), 2131 ao % 65536, an % 65536, udp); 2132} 2133 2134#ifdef INET6 2135void 2136pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2137{ 2138 struct pf_addr ao; 2139 2140 PF_ACPY(&ao, a, AF_INET6); 2141 PF_ACPY(a, an, AF_INET6); 2142 2143 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2144 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2145 pf_cksum_fixup(pf_cksum_fixup(*c, 2146 ao.addr16[0], an->addr16[0], u), 2147 ao.addr16[1], an->addr16[1], u), 2148 ao.addr16[2], an->addr16[2], u), 2149 ao.addr16[3], an->addr16[3], u), 2150 ao.addr16[4], an->addr16[4], u), 2151 ao.addr16[5], an->addr16[5], u), 2152 ao.addr16[6], an->addr16[6], u), 2153 ao.addr16[7], an->addr16[7], u); 2154} 2155#endif /* INET6 */ 2156 2157void 2158pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2159 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2160 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2161{ 2162 struct pf_addr oia, ooa; 2163 2164 PF_ACPY(&oia, ia, af); 2165 if (oa) 2166 PF_ACPY(&ooa, oa, af); 2167 2168 /* Change inner protocol port, fix inner protocol checksum. */ 2169 if (ip != NULL) { 2170 u_int16_t oip = *ip; 2171 u_int32_t opc; 2172 2173 if (pc != NULL) 2174 opc = *pc; 2175 *ip = np; 2176 if (pc != NULL) 2177 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2178 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2179 if (pc != NULL) 2180 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2181 } 2182 /* Change inner ip address, fix inner ip and icmp checksums. */ 2183 PF_ACPY(ia, na, af); 2184 switch (af) { 2185#ifdef INET 2186 case AF_INET: { 2187 u_int32_t oh2c = *h2c; 2188 2189 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2190 oia.addr16[0], ia->addr16[0], 0), 2191 oia.addr16[1], ia->addr16[1], 0); 2192 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2193 oia.addr16[0], ia->addr16[0], 0), 2194 oia.addr16[1], ia->addr16[1], 0); 2195 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2196 break; 2197 } 2198#endif /* INET */ 2199#ifdef INET6 2200 case AF_INET6: 2201 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2202 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2203 pf_cksum_fixup(pf_cksum_fixup(*ic, 2204 oia.addr16[0], ia->addr16[0], u), 2205 oia.addr16[1], ia->addr16[1], u), 2206 oia.addr16[2], ia->addr16[2], u), 2207 oia.addr16[3], ia->addr16[3], u), 2208 oia.addr16[4], ia->addr16[4], u), 2209 oia.addr16[5], ia->addr16[5], u), 2210 oia.addr16[6], ia->addr16[6], u), 2211 oia.addr16[7], ia->addr16[7], u); 2212 break; 2213#endif /* INET6 */ 2214 } 2215 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2216 if (oa) { 2217 PF_ACPY(oa, na, af); 2218 switch (af) { 2219#ifdef INET 2220 case AF_INET: 2221 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2222 ooa.addr16[0], oa->addr16[0], 0), 2223 ooa.addr16[1], oa->addr16[1], 0); 2224 break; 2225#endif /* INET */ 2226#ifdef INET6 2227 case AF_INET6: 2228 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2229 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2230 pf_cksum_fixup(pf_cksum_fixup(*ic, 2231 ooa.addr16[0], oa->addr16[0], u), 2232 ooa.addr16[1], oa->addr16[1], u), 2233 ooa.addr16[2], oa->addr16[2], u), 2234 ooa.addr16[3], oa->addr16[3], u), 2235 ooa.addr16[4], oa->addr16[4], u), 2236 ooa.addr16[5], oa->addr16[5], u), 2237 ooa.addr16[6], oa->addr16[6], u), 2238 ooa.addr16[7], oa->addr16[7], u); 2239 break; 2240#endif /* INET6 */ 2241 } 2242 } 2243} 2244 2245 2246/* 2247 * Need to modulate the sequence numbers in the TCP SACK option 2248 * (credits to Krzysztof Pfaff for report and patch) 2249 */ 2250int 2251pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2252 struct tcphdr *th, struct pf_state_peer *dst) 2253{ 2254 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2255#ifdef __FreeBSD__ 2256 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2257#else 2258 u_int8_t opts[MAX_TCPOPTLEN], *opt = opts; 2259#endif 2260 int copyback = 0, i, olen; 2261 struct sackblk sack; 2262 2263#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2264 if (hlen < TCPOLEN_SACKLEN || 2265 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2266 return 0; 2267 2268 while (hlen >= TCPOLEN_SACKLEN) { 2269 olen = opt[1]; 2270 switch (*opt) { 2271 case TCPOPT_EOL: /* FALLTHROUGH */ 2272 case TCPOPT_NOP: 2273 opt++; 2274 hlen--; 2275 break; 2276 case TCPOPT_SACK: 2277 if (olen > hlen) 2278 olen = hlen; 2279 if (olen >= TCPOLEN_SACKLEN) { 2280 for (i = 2; i + TCPOLEN_SACK <= olen; 2281 i += TCPOLEN_SACK) { 2282 memcpy(&sack, &opt[i], sizeof(sack)); 2283 pf_change_proto_a(m, &sack.start, &th->th_sum, 2284 htonl(ntohl(sack.start) - dst->seqdiff), 0); 2285 pf_change_proto_a(m, &sack.end, &th->th_sum, 2286 htonl(ntohl(sack.end) - dst->seqdiff), 0); 2287 memcpy(&opt[i], &sack, sizeof(sack)); 2288 } 2289 copyback = 1; 2290 } 2291 /* FALLTHROUGH */ 2292 default: 2293 if (olen < 2) 2294 olen = 2; 2295 hlen -= olen; 2296 opt += olen; 2297 } 2298 } 2299 2300 if (copyback) 2301#ifdef __FreeBSD__ 2302 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2303#else 2304 m_copyback(m, off + sizeof(*th), thoptlen, opts); 2305#endif 2306 return (copyback); 2307} 2308 2309void 2310#ifdef __FreeBSD__ 2311pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2312#else 2313pf_send_tcp(const struct pf_rule *r, sa_family_t af, 2314#endif 2315 const struct pf_addr *saddr, const struct pf_addr *daddr, 2316 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2317 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2318 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 2319{ 2320 struct mbuf *m; 2321 int len, tlen; 2322#ifdef INET 2323 struct ip *h; 2324#endif /* INET */ 2325#ifdef INET6 2326 struct ip6_hdr *h6; 2327#endif /* INET6 */ 2328 struct tcphdr *th; 2329 char *opt; 2330#ifdef __FreeBSD__ 2331 struct pf_mtag *pf_mtag; 2332 2333 KASSERT( 2334#ifdef INET 2335 af == AF_INET 2336#else 2337 0 2338#endif 2339 || 2340#ifdef INET6 2341 af == AF_INET6 2342#else 2343 0 2344#endif 2345 , ("Unsupported AF %d", af)); 2346 len = 0; 2347 th = NULL; 2348#ifdef INET 2349 h = NULL; 2350#endif 2351#ifdef INET6 2352 h6 = NULL; 2353#endif 2354#endif /* __FreeBSD__ */ 2355 2356 /* maximum segment size tcp option */ 2357 tlen = sizeof(struct tcphdr); 2358 if (mss) 2359 tlen += 4; 2360 2361 switch (af) { 2362#ifdef INET 2363 case AF_INET: 2364 len = sizeof(struct ip) + tlen; 2365 break; 2366#endif /* INET */ 2367#ifdef INET6 2368 case AF_INET6: 2369 len = sizeof(struct ip6_hdr) + tlen; 2370 break; 2371#endif /* INET6 */ 2372 } 2373 2374 /* create outgoing mbuf */ 2375 m = m_gethdr(M_DONTWAIT, MT_HEADER); 2376 if (m == NULL) 2377 return; 2378#ifdef __FreeBSD__ 2379#ifdef MAC 2380 mac_netinet_firewall_send(m); 2381#endif 2382 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2383 m_freem(m); 2384 return; 2385 } 2386#endif 2387 if (tag) 2388#ifdef __FreeBSD__ 2389 m->m_flags |= M_SKIP_FIREWALL; 2390 pf_mtag->tag = rtag; 2391#else 2392 m->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 2393 m->m_pkthdr.pf.tag = rtag; 2394#endif 2395 2396 if (r != NULL && r->rtableid >= 0) 2397#ifdef __FreeBSD__ 2398 { 2399 M_SETFIB(m, r->rtableid); 2400 pf_mtag->rtableid = r->rtableid; 2401#else 2402 m->m_pkthdr.pf.rtableid = r->rtableid; 2403#endif 2404#ifdef __FreeBSD__ 2405 } 2406#endif 2407 2408#ifdef ALTQ 2409 if (r != NULL && r->qid) { 2410#ifdef __FreeBSD__ 2411 pf_mtag->qid = r->qid; 2412 2413 /* add hints for ecn */ 2414 pf_mtag->hdr = mtod(m, struct ip *); 2415#else 2416 m->m_pkthdr.pf.qid = r->qid; 2417 /* add hints for ecn */ 2418 m->m_pkthdr.pf.hdr = mtod(m, struct ip *); 2419#endif 2420 } 2421#endif /* ALTQ */ 2422 m->m_data += max_linkhdr; 2423 m->m_pkthdr.len = m->m_len = len; 2424 m->m_pkthdr.rcvif = NULL; 2425 bzero(m->m_data, len); 2426 switch (af) { 2427#ifdef INET 2428 case AF_INET: 2429 h = mtod(m, struct ip *); 2430 2431 /* IP header fields included in the TCP checksum */ 2432 h->ip_p = IPPROTO_TCP; 2433 h->ip_len = htons(tlen); 2434 h->ip_src.s_addr = saddr->v4.s_addr; 2435 h->ip_dst.s_addr = daddr->v4.s_addr; 2436 2437 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2438 break; 2439#endif /* INET */ 2440#ifdef INET6 2441 case AF_INET6: 2442 h6 = mtod(m, struct ip6_hdr *); 2443 2444 /* IP header fields included in the TCP checksum */ 2445 h6->ip6_nxt = IPPROTO_TCP; 2446 h6->ip6_plen = htons(tlen); 2447 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2448 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2449 2450 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2451 break; 2452#endif /* INET6 */ 2453 } 2454 2455 /* TCP header */ 2456 th->th_sport = sport; 2457 th->th_dport = dport; 2458 th->th_seq = htonl(seq); 2459 th->th_ack = htonl(ack); 2460 th->th_off = tlen >> 2; 2461 th->th_flags = flags; 2462 th->th_win = htons(win); 2463 2464 if (mss) { 2465 opt = (char *)(th + 1); 2466 opt[0] = TCPOPT_MAXSEG; 2467 opt[1] = 4; 2468 HTONS(mss); 2469 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2470 } 2471 2472 switch (af) { 2473#ifdef INET 2474 case AF_INET: 2475 /* TCP checksum */ 2476 th->th_sum = in_cksum(m, len); 2477 2478 /* Finish the IP header */ 2479 h->ip_v = 4; 2480 h->ip_hl = sizeof(*h) >> 2; 2481 h->ip_tos = IPTOS_LOWDELAY; 2482#ifdef __FreeBSD__ 2483 h->ip_off = V_path_mtu_discovery ? IP_DF : 0; 2484 h->ip_len = len; 2485 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2486#else 2487 h->ip_len = htons(len); 2488 h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 2489 h->ip_ttl = ttl ? ttl : ip_defttl; 2490#endif 2491 h->ip_sum = 0; 2492 if (eh == NULL) { 2493#ifdef __FreeBSD__ 2494 PF_UNLOCK(); 2495 ip_output(m, (void *)NULL, (void *)NULL, 0, 2496 (void *)NULL, (void *)NULL); 2497 PF_LOCK(); 2498#else /* ! __FreeBSD__ */ 2499 ip_output(m, (void *)NULL, (void *)NULL, 0, 2500 (void *)NULL, (void *)NULL); 2501#endif 2502 } else { 2503 struct route ro; 2504 struct rtentry rt; 2505 struct ether_header *e = (void *)ro.ro_dst.sa_data; 2506 2507 if (ifp == NULL) { 2508 m_freem(m); 2509 return; 2510 } 2511 rt.rt_ifp = ifp; 2512 ro.ro_rt = &rt; 2513 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 2514 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 2515 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 2516 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 2517 e->ether_type = eh->ether_type; 2518#ifdef __FreeBSD__ 2519 PF_UNLOCK(); 2520 /* XXX_IMPORT: later */ 2521 ip_output(m, (void *)NULL, &ro, 0, 2522 (void *)NULL, (void *)NULL); 2523 PF_LOCK(); 2524#else /* ! __FreeBSD__ */ 2525 ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 2526 (void *)NULL, (void *)NULL); 2527#endif 2528 } 2529 break; 2530#endif /* INET */ 2531#ifdef INET6 2532 case AF_INET6: 2533 /* TCP checksum */ 2534 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2535 sizeof(struct ip6_hdr), tlen); 2536 2537 h6->ip6_vfc |= IPV6_VERSION; 2538 h6->ip6_hlim = IPV6_DEFHLIM; 2539 2540#ifdef __FreeBSD__ 2541 PF_UNLOCK(); 2542 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 2543 PF_LOCK(); 2544#else 2545 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 2546#endif 2547 break; 2548#endif /* INET6 */ 2549 } 2550} 2551 2552static void 2553pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2554 struct pf_rule *r) 2555{ 2556 struct mbuf *m0; 2557#ifdef __FreeBSD__ 2558#ifdef INET 2559 struct ip *ip; 2560#endif 2561 struct pf_mtag *pf_mtag; 2562#endif 2563 2564#ifdef __FreeBSD__ 2565 m0 = m_copypacket(m, M_DONTWAIT); 2566 if (m0 == NULL) 2567 return; 2568#else 2569 if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL) 2570 return; 2571#endif 2572 2573#ifdef __FreeBSD__ 2574 if ((pf_mtag = pf_get_mtag(m0)) == NULL) 2575 return; 2576 /* XXX: revisit */ 2577 m0->m_flags |= M_SKIP_FIREWALL; 2578#else 2579 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 2580#endif 2581 2582 if (r->rtableid >= 0) 2583#ifdef __FreeBSD__ 2584 { 2585 M_SETFIB(m0, r->rtableid); 2586 pf_mtag->rtableid = r->rtableid; 2587#else 2588 m0->m_pkthdr.pf.rtableid = r->rtableid; 2589#endif 2590#ifdef __FreeBSD__ 2591 } 2592#endif 2593 2594#ifdef ALTQ 2595 if (r->qid) { 2596#ifdef __FreeBSD__ 2597 pf_mtag->qid = r->qid; 2598 /* add hints for ecn */ 2599 pf_mtag->hdr = mtod(m0, struct ip *); 2600#else 2601 m0->m_pkthdr.pf.qid = r->qid; 2602 /* add hints for ecn */ 2603 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *); 2604#endif 2605 } 2606#endif /* ALTQ */ 2607 2608 switch (af) { 2609#ifdef INET 2610 case AF_INET: 2611#ifdef __FreeBSD__ 2612 /* icmp_error() expects host byte ordering */ 2613 ip = mtod(m0, struct ip *); 2614 NTOHS(ip->ip_len); 2615 NTOHS(ip->ip_off); 2616 PF_UNLOCK(); 2617 icmp_error(m0, type, code, 0, 0); 2618 PF_LOCK(); 2619#else 2620 icmp_error(m0, type, code, 0, 0); 2621#endif 2622 break; 2623#endif /* INET */ 2624#ifdef INET6 2625 case AF_INET6: 2626#ifdef __FreeBSD__ 2627 PF_UNLOCK(); 2628#endif 2629 icmp6_error(m0, type, code, 0); 2630#ifdef __FreeBSD__ 2631 PF_LOCK(); 2632#endif 2633 break; 2634#endif /* INET6 */ 2635 } 2636} 2637 2638/* 2639 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2640 * If n is 0, they match if they are equal. If n is != 0, they match if they 2641 * are different. 2642 */ 2643int 2644pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2645 struct pf_addr *b, sa_family_t af) 2646{ 2647 int match = 0; 2648 2649 switch (af) { 2650#ifdef INET 2651 case AF_INET: 2652 if ((a->addr32[0] & m->addr32[0]) == 2653 (b->addr32[0] & m->addr32[0])) 2654 match++; 2655 break; 2656#endif /* INET */ 2657#ifdef INET6 2658 case AF_INET6: 2659 if (((a->addr32[0] & m->addr32[0]) == 2660 (b->addr32[0] & m->addr32[0])) && 2661 ((a->addr32[1] & m->addr32[1]) == 2662 (b->addr32[1] & m->addr32[1])) && 2663 ((a->addr32[2] & m->addr32[2]) == 2664 (b->addr32[2] & m->addr32[2])) && 2665 ((a->addr32[3] & m->addr32[3]) == 2666 (b->addr32[3] & m->addr32[3]))) 2667 match++; 2668 break; 2669#endif /* INET6 */ 2670 } 2671 if (match) { 2672 if (n) 2673 return (0); 2674 else 2675 return (1); 2676 } else { 2677 if (n) 2678 return (1); 2679 else 2680 return (0); 2681 } 2682} 2683 2684/* 2685 * Return 1 if b <= a <= e, otherwise return 0. 2686 */ 2687int 2688pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2689 struct pf_addr *a, sa_family_t af) 2690{ 2691 switch (af) { 2692#ifdef INET 2693 case AF_INET: 2694 if ((a->addr32[0] < b->addr32[0]) || 2695 (a->addr32[0] > e->addr32[0])) 2696 return (0); 2697 break; 2698#endif /* INET */ 2699#ifdef INET6 2700 case AF_INET6: { 2701 int i; 2702 2703 /* check a >= b */ 2704 for (i = 0; i < 4; ++i) 2705 if (a->addr32[i] > b->addr32[i]) 2706 break; 2707 else if (a->addr32[i] < b->addr32[i]) 2708 return (0); 2709 /* check a <= e */ 2710 for (i = 0; i < 4; ++i) 2711 if (a->addr32[i] < e->addr32[i]) 2712 break; 2713 else if (a->addr32[i] > e->addr32[i]) 2714 return (0); 2715 break; 2716 } 2717#endif /* INET6 */ 2718 } 2719 return (1); 2720} 2721 2722int 2723pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2724{ 2725 switch (op) { 2726 case PF_OP_IRG: 2727 return ((p > a1) && (p < a2)); 2728 case PF_OP_XRG: 2729 return ((p < a1) || (p > a2)); 2730 case PF_OP_RRG: 2731 return ((p >= a1) && (p <= a2)); 2732 case PF_OP_EQ: 2733 return (p == a1); 2734 case PF_OP_NE: 2735 return (p != a1); 2736 case PF_OP_LT: 2737 return (p < a1); 2738 case PF_OP_LE: 2739 return (p <= a1); 2740 case PF_OP_GT: 2741 return (p > a1); 2742 case PF_OP_GE: 2743 return (p >= a1); 2744 } 2745 return (0); /* never reached */ 2746} 2747 2748int 2749pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2750{ 2751 NTOHS(a1); 2752 NTOHS(a2); 2753 NTOHS(p); 2754 return (pf_match(op, a1, a2, p)); 2755} 2756 2757int 2758pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2759{ 2760 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2761 return (0); 2762 return (pf_match(op, a1, a2, u)); 2763} 2764 2765int 2766pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2767{ 2768 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2769 return (0); 2770 return (pf_match(op, a1, a2, g)); 2771} 2772 2773int 2774#ifdef __FreeBSD__ 2775pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, 2776 struct pf_mtag *pf_mtag) 2777#else 2778pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag) 2779#endif 2780{ 2781 if (*tag == -1) 2782#ifdef __FreeBSD__ 2783 *tag = pf_mtag->tag; 2784#else 2785 *tag = m->m_pkthdr.pf.tag; 2786#endif 2787 2788 return ((!r->match_tag_not && r->match_tag == *tag) || 2789 (r->match_tag_not && r->match_tag != *tag)); 2790} 2791 2792int 2793#ifdef __FreeBSD__ 2794pf_tag_packet(struct mbuf *m, int tag, int rtableid, 2795 struct pf_mtag *pf_mtag) 2796#else 2797pf_tag_packet(struct mbuf *m, int tag, int rtableid) 2798#endif 2799{ 2800 if (tag <= 0 && rtableid < 0) 2801 return (0); 2802 2803 if (tag > 0) 2804#ifdef __FreeBSD__ 2805 pf_mtag->tag = tag; 2806#else 2807 m->m_pkthdr.pf.tag = tag; 2808#endif 2809 if (rtableid >= 0) 2810#ifdef __FreeBSD__ 2811 { 2812 M_SETFIB(m, rtableid); 2813 } 2814#else 2815 m->m_pkthdr.pf.rtableid = rtableid; 2816#endif 2817 2818 return (0); 2819} 2820 2821void 2822pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2823 struct pf_rule **r, struct pf_rule **a, int *match) 2824{ 2825 struct pf_anchor_stackframe *f; 2826 2827 (*r)->anchor->match = 0; 2828 if (match) 2829 *match = 0; 2830#ifdef __FreeBSD__ 2831 if (*depth >= sizeof(V_pf_anchor_stack) / 2832 sizeof(V_pf_anchor_stack[0])) { 2833#else 2834 if (*depth >= sizeof(pf_anchor_stack) / 2835 sizeof(pf_anchor_stack[0])) { 2836#endif 2837 printf("pf_step_into_anchor: stack overflow\n"); 2838 *r = TAILQ_NEXT(*r, entries); 2839 return; 2840 } else if (*depth == 0 && a != NULL) 2841 *a = *r; 2842#ifdef __FreeBSD__ 2843 f = V_pf_anchor_stack + (*depth)++; 2844#else 2845 f = pf_anchor_stack + (*depth)++; 2846#endif 2847 f->rs = *rs; 2848 f->r = *r; 2849 if ((*r)->anchor_wildcard) { 2850 f->parent = &(*r)->anchor->children; 2851 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2852 NULL) { 2853 *r = NULL; 2854 return; 2855 } 2856 *rs = &f->child->ruleset; 2857 } else { 2858 f->parent = NULL; 2859 f->child = NULL; 2860 *rs = &(*r)->anchor->ruleset; 2861 } 2862 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2863} 2864 2865int 2866pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2867 struct pf_rule **r, struct pf_rule **a, int *match) 2868{ 2869 struct pf_anchor_stackframe *f; 2870 int quick = 0; 2871 2872 do { 2873 if (*depth <= 0) 2874 break; 2875#ifdef __FreeBSD__ 2876 f = V_pf_anchor_stack + *depth - 1; 2877#else 2878 f = pf_anchor_stack + *depth - 1; 2879#endif 2880 if (f->parent != NULL && f->child != NULL) { 2881 if (f->child->match || 2882 (match != NULL && *match)) { 2883 f->r->anchor->match = 1; 2884 *match = 0; 2885 } 2886 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2887 if (f->child != NULL) { 2888 *rs = &f->child->ruleset; 2889 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2890 if (*r == NULL) 2891 continue; 2892 else 2893 break; 2894 } 2895 } 2896 (*depth)--; 2897 if (*depth == 0 && a != NULL) 2898 *a = NULL; 2899 *rs = f->rs; 2900 if (f->r->anchor->match || (match != NULL && *match)) 2901 quick = f->r->quick; 2902 *r = TAILQ_NEXT(f->r, entries); 2903 } while (*r == NULL); 2904 2905 return (quick); 2906} 2907 2908#ifdef INET6 2909void 2910pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2911 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2912{ 2913 switch (af) { 2914#ifdef INET 2915 case AF_INET: 2916 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2917 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2918 break; 2919#endif /* INET */ 2920 case AF_INET6: 2921 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2922 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2923 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2924 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2925 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2926 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2927 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2928 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2929 break; 2930 } 2931} 2932 2933void 2934pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2935{ 2936 switch (af) { 2937#ifdef INET 2938 case AF_INET: 2939 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2940 break; 2941#endif /* INET */ 2942 case AF_INET6: 2943 if (addr->addr32[3] == 0xffffffff) { 2944 addr->addr32[3] = 0; 2945 if (addr->addr32[2] == 0xffffffff) { 2946 addr->addr32[2] = 0; 2947 if (addr->addr32[1] == 0xffffffff) { 2948 addr->addr32[1] = 0; 2949 addr->addr32[0] = 2950 htonl(ntohl(addr->addr32[0]) + 1); 2951 } else 2952 addr->addr32[1] = 2953 htonl(ntohl(addr->addr32[1]) + 1); 2954 } else 2955 addr->addr32[2] = 2956 htonl(ntohl(addr->addr32[2]) + 1); 2957 } else 2958 addr->addr32[3] = 2959 htonl(ntohl(addr->addr32[3]) + 1); 2960 break; 2961 } 2962} 2963#endif /* INET6 */ 2964 2965int 2966#ifdef __FreeBSD__ 2967pf_socket_lookup(int direction, struct pf_pdesc *pd, struct inpcb *inp_arg) 2968#else 2969pf_socket_lookup(int direction, struct pf_pdesc *pd) 2970#endif 2971{ 2972 struct pf_addr *saddr, *daddr; 2973 u_int16_t sport, dport; 2974#ifdef __FreeBSD__ 2975 struct inpcbinfo *pi; 2976#else 2977 struct inpcbtable *tb; 2978#endif 2979 struct inpcb *inp; 2980 2981 if (pd == NULL) 2982 return (-1); 2983 pd->lookup.uid = UID_MAX; 2984 pd->lookup.gid = GID_MAX; 2985 pd->lookup.pid = NO_PID; 2986 2987#ifdef __FreeBSD__ 2988 if (inp_arg != NULL) { 2989 INP_LOCK_ASSERT(inp_arg); 2990 pd->lookup.uid = inp_arg->inp_cred->cr_uid; 2991 pd->lookup.gid = inp_arg->inp_cred->cr_groups[0]; 2992 return (1); 2993 } 2994#endif 2995 2996 switch (pd->proto) { 2997 case IPPROTO_TCP: 2998 if (pd->hdr.tcp == NULL) 2999 return (-1); 3000 sport = pd->hdr.tcp->th_sport; 3001 dport = pd->hdr.tcp->th_dport; 3002#ifdef __FreeBSD__ 3003 pi = &V_tcbinfo; 3004#else 3005 tb = &tcbtable; 3006#endif 3007 break; 3008 case IPPROTO_UDP: 3009 if (pd->hdr.udp == NULL) 3010 return (-1); 3011 sport = pd->hdr.udp->uh_sport; 3012 dport = pd->hdr.udp->uh_dport; 3013#ifdef __FreeBSD__ 3014 pi = &V_udbinfo; 3015#else 3016 tb = &udbtable; 3017#endif 3018 break; 3019 default: 3020 return (-1); 3021 } 3022 if (direction == PF_IN) { 3023 saddr = pd->src; 3024 daddr = pd->dst; 3025 } else { 3026 u_int16_t p; 3027 3028 p = sport; 3029 sport = dport; 3030 dport = p; 3031 saddr = pd->dst; 3032 daddr = pd->src; 3033 } 3034 switch (pd->af) { 3035#ifdef INET 3036 case AF_INET: 3037#ifdef __FreeBSD__ 3038 /* 3039 * XXXRW: would be nice if we had an mbuf here so that we 3040 * could use in_pcblookup_mbuf(). 3041 */ 3042 inp = in_pcblookup(pi, saddr->v4, sport, daddr->v4, 3043 dport, INPLOOKUP_RLOCKPCB, NULL); 3044 if (inp == NULL) { 3045 inp = in_pcblookup(pi, saddr->v4, sport, 3046 daddr->v4, dport, INPLOOKUP_WILDCARD | 3047 INPLOOKUP_RLOCKPCB, NULL); 3048 if (inp == NULL) 3049 return (-1); 3050 } 3051#else 3052 inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 3053 if (inp == NULL) { 3054 inp = in_pcblookup_listen(tb, daddr->v4, dport, 0, 3055 NULL); 3056 if (inp == NULL) 3057 return (-1); 3058 } 3059#endif 3060 break; 3061#endif /* INET */ 3062#ifdef INET6 3063 case AF_INET6: 3064#ifdef __FreeBSD__ 3065 /* 3066 * XXXRW: would be nice if we had an mbuf here so that we 3067 * could use in6_pcblookup_mbuf(). 3068 */ 3069 inp = in6_pcblookup(pi, &saddr->v6, sport, 3070 &daddr->v6, dport, INPLOOKUP_RLOCKPCB, NULL); 3071 if (inp == NULL) { 3072 inp = in6_pcblookup(pi, &saddr->v6, sport, 3073 &daddr->v6, dport, INPLOOKUP_WILDCARD | 3074 INPLOOKUP_RLOCKPCB, NULL); 3075 if (inp == NULL) 3076 return (-1); 3077 } 3078#else 3079 inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 3080 dport); 3081 if (inp == NULL) { 3082 inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0, 3083 NULL); 3084 if (inp == NULL) 3085 return (-1); 3086 } 3087#endif 3088 break; 3089#endif /* INET6 */ 3090 3091 default: 3092 return (-1); 3093 } 3094#ifdef __FreeBSD__ 3095 INP_RLOCK_ASSERT(inp); 3096 pd->lookup.uid = inp->inp_cred->cr_uid; 3097 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3098 INP_RUNLOCK(inp); 3099#else 3100 pd->lookup.uid = inp->inp_socket->so_euid; 3101 pd->lookup.gid = inp->inp_socket->so_egid; 3102 pd->lookup.pid = inp->inp_socket->so_cpid; 3103#endif 3104 return (1); 3105} 3106 3107u_int8_t 3108pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3109{ 3110 int hlen; 3111 u_int8_t hdr[60]; 3112 u_int8_t *opt, optlen; 3113 u_int8_t wscale = 0; 3114 3115 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3116 if (hlen <= sizeof(struct tcphdr)) 3117 return (0); 3118 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3119 return (0); 3120 opt = hdr + sizeof(struct tcphdr); 3121 hlen -= sizeof(struct tcphdr); 3122 while (hlen >= 3) { 3123 switch (*opt) { 3124 case TCPOPT_EOL: 3125 case TCPOPT_NOP: 3126 ++opt; 3127 --hlen; 3128 break; 3129 case TCPOPT_WINDOW: 3130 wscale = opt[2]; 3131 if (wscale > TCP_MAX_WINSHIFT) 3132 wscale = TCP_MAX_WINSHIFT; 3133 wscale |= PF_WSCALE_FLAG; 3134 /* FALLTHROUGH */ 3135 default: 3136 optlen = opt[1]; 3137 if (optlen < 2) 3138 optlen = 2; 3139 hlen -= optlen; 3140 opt += optlen; 3141 break; 3142 } 3143 } 3144 return (wscale); 3145} 3146 3147u_int16_t 3148pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3149{ 3150 int hlen; 3151 u_int8_t hdr[60]; 3152 u_int8_t *opt, optlen; 3153#ifdef __FreeBSD__ 3154 u_int16_t mss = V_tcp_mssdflt; 3155#else 3156 u_int16_t mss = tcp_mssdflt; 3157#endif 3158 3159 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3160 if (hlen <= sizeof(struct tcphdr)) 3161 return (0); 3162 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3163 return (0); 3164 opt = hdr + sizeof(struct tcphdr); 3165 hlen -= sizeof(struct tcphdr); 3166 while (hlen >= TCPOLEN_MAXSEG) { 3167 switch (*opt) { 3168 case TCPOPT_EOL: 3169 case TCPOPT_NOP: 3170 ++opt; 3171 --hlen; 3172 break; 3173 case TCPOPT_MAXSEG: 3174 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3175 NTOHS(mss); 3176 /* FALLTHROUGH */ 3177 default: 3178 optlen = opt[1]; 3179 if (optlen < 2) 3180 optlen = 2; 3181 hlen -= optlen; 3182 opt += optlen; 3183 break; 3184 } 3185 } 3186 return (mss); 3187} 3188 3189u_int16_t 3190pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 3191{ 3192#ifdef INET 3193 struct sockaddr_in *dst; 3194 struct route ro; 3195#endif /* INET */ 3196#ifdef INET6 3197 struct sockaddr_in6 *dst6; 3198 struct route_in6 ro6; 3199#endif /* INET6 */ 3200 struct rtentry *rt = NULL; 3201#ifdef __FreeBSD__ 3202 int hlen = 0; 3203 u_int16_t mss = V_tcp_mssdflt; 3204#else 3205 int hlen; 3206 u_int16_t mss = tcp_mssdflt; 3207#endif 3208 3209 switch (af) { 3210#ifdef INET 3211 case AF_INET: 3212 hlen = sizeof(struct ip); 3213 bzero(&ro, sizeof(ro)); 3214 dst = (struct sockaddr_in *)&ro.ro_dst; 3215 dst->sin_family = AF_INET; 3216 dst->sin_len = sizeof(*dst); 3217 dst->sin_addr = addr->v4; 3218#ifdef __FreeBSD__ 3219 in_rtalloc_ign(&ro, 0, rtableid); 3220#else /* ! __FreeBSD__ */ 3221 rtalloc_noclone(&ro, NO_CLONING); 3222#endif 3223 rt = ro.ro_rt; 3224 break; 3225#endif /* INET */ 3226#ifdef INET6 3227 case AF_INET6: 3228 hlen = sizeof(struct ip6_hdr); 3229 bzero(&ro6, sizeof(ro6)); 3230 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3231 dst6->sin6_family = AF_INET6; 3232 dst6->sin6_len = sizeof(*dst6); 3233 dst6->sin6_addr = addr->v6; 3234#ifdef __FreeBSD__ 3235 in6_rtalloc_ign(&ro6, 0, rtableid); 3236#else /* ! __FreeBSD__ */ 3237 rtalloc_noclone((struct route *)&ro6, NO_CLONING); 3238#endif 3239 rt = ro6.ro_rt; 3240 break; 3241#endif /* INET6 */ 3242 } 3243 3244 if (rt && rt->rt_ifp) { 3245 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3246#ifdef __FreeBSD__ 3247 mss = max(V_tcp_mssdflt, mss); 3248#else 3249 mss = max(tcp_mssdflt, mss); 3250#endif 3251 RTFREE(rt); 3252 } 3253 mss = min(mss, offer); 3254 mss = max(mss, 64); /* sanity - at least max opt space */ 3255 return (mss); 3256} 3257 3258void 3259pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3260{ 3261 struct pf_rule *r = s->rule.ptr; 3262 struct pf_src_node *sn = NULL; 3263 3264 s->rt_kif = NULL; 3265 if (!r->rt || r->rt == PF_FASTROUTE) 3266 return; 3267 switch (s->key[PF_SK_WIRE]->af) { 3268#ifdef INET 3269 case AF_INET: 3270 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, &sn); 3271 s->rt_kif = r->rpool.cur->kif; 3272 break; 3273#endif /* INET */ 3274#ifdef INET6 3275 case AF_INET6: 3276 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, &sn); 3277 s->rt_kif = r->rpool.cur->kif; 3278 break; 3279#endif /* INET6 */ 3280 } 3281} 3282 3283u_int32_t 3284pf_tcp_iss(struct pf_pdesc *pd) 3285{ 3286 MD5_CTX ctx; 3287 u_int32_t digest[4]; 3288 3289#ifdef __FreeBSD__ 3290 if (V_pf_tcp_secret_init == 0) { 3291 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 3292 MD5Init(&V_pf_tcp_secret_ctx); 3293 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 3294 sizeof(V_pf_tcp_secret)); 3295 V_pf_tcp_secret_init = 1; 3296 } 3297 3298 ctx = V_pf_tcp_secret_ctx; 3299#else 3300 if (pf_tcp_secret_init == 0) { 3301 arc4random_buf(pf_tcp_secret, sizeof(pf_tcp_secret)); 3302 MD5Init(&pf_tcp_secret_ctx); 3303 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret, 3304 sizeof(pf_tcp_secret)); 3305 pf_tcp_secret_init = 1; 3306 } 3307 3308 ctx = pf_tcp_secret_ctx; 3309#endif 3310 3311 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3312 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3313 if (pd->af == AF_INET6) { 3314 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3315 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3316 } else { 3317 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3318 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3319 } 3320 MD5Final((u_char *)digest, &ctx); 3321#ifdef __FreeBSD__ 3322 V_pf_tcp_iss_off += 4096; 3323#define ISN_RANDOM_INCREMENT (4096 - 1) 3324 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 3325 V_pf_tcp_iss_off); 3326#undef ISN_RANDOM_INCREMENT 3327#else 3328 pf_tcp_iss_off += 4096; 3329 return (digest[0] + tcp_iss + pf_tcp_iss_off); 3330#endif 3331} 3332 3333int 3334pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3335 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3336 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3337#ifdef __FreeBSD__ 3338 struct ifqueue *ifq, struct inpcb *inp) 3339#else 3340 struct ifqueue *ifq) 3341#endif 3342{ 3343 struct pf_rule *nr = NULL; 3344 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3345 sa_family_t af = pd->af; 3346 struct pf_rule *r, *a = NULL; 3347 struct pf_ruleset *ruleset = NULL; 3348 struct pf_src_node *nsn = NULL; 3349 struct tcphdr *th = pd->hdr.tcp; 3350 struct pf_state_key *skw = NULL, *sks = NULL; 3351 struct pf_state_key *sk = NULL, *nk = NULL; 3352 u_short reason; 3353 int rewrite = 0, hdrlen = 0; 3354 int tag = -1, rtableid = -1; 3355 int asd = 0; 3356 int match = 0; 3357 int state_icmp = 0; 3358#ifdef __FreeBSD__ 3359 u_int16_t sport = 0, dport = 0; 3360 u_int16_t bproto_sum = 0, bip_sum = 0; 3361#else 3362 u_int16_t sport, dport; 3363 u_int16_t bproto_sum = 0, bip_sum; 3364#endif 3365 u_int8_t icmptype = 0, icmpcode = 0; 3366 3367 3368 if (direction == PF_IN && pf_check_congestion(ifq)) { 3369 REASON_SET(&reason, PFRES_CONGEST); 3370 return (PF_DROP); 3371 } 3372 3373#ifdef __FreeBSD__ 3374 if (inp != NULL) 3375 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3376 else if (V_debug_pfugidhack) { 3377 PF_UNLOCK(); 3378 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3379 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3380 PF_LOCK(); 3381 } 3382#endif 3383 3384 switch (pd->proto) { 3385 case IPPROTO_TCP: 3386 sport = th->th_sport; 3387 dport = th->th_dport; 3388 hdrlen = sizeof(*th); 3389 break; 3390 case IPPROTO_UDP: 3391 sport = pd->hdr.udp->uh_sport; 3392 dport = pd->hdr.udp->uh_dport; 3393 hdrlen = sizeof(*pd->hdr.udp); 3394 break; 3395#ifdef INET 3396 case IPPROTO_ICMP: 3397 if (pd->af != AF_INET) 3398 break; 3399 sport = dport = pd->hdr.icmp->icmp_id; 3400 hdrlen = sizeof(*pd->hdr.icmp); 3401 icmptype = pd->hdr.icmp->icmp_type; 3402 icmpcode = pd->hdr.icmp->icmp_code; 3403 3404 if (icmptype == ICMP_UNREACH || 3405 icmptype == ICMP_SOURCEQUENCH || 3406 icmptype == ICMP_REDIRECT || 3407 icmptype == ICMP_TIMXCEED || 3408 icmptype == ICMP_PARAMPROB) 3409 state_icmp++; 3410 break; 3411#endif /* INET */ 3412#ifdef INET6 3413 case IPPROTO_ICMPV6: 3414 if (af != AF_INET6) 3415 break; 3416 sport = dport = pd->hdr.icmp6->icmp6_id; 3417 hdrlen = sizeof(*pd->hdr.icmp6); 3418 icmptype = pd->hdr.icmp6->icmp6_type; 3419 icmpcode = pd->hdr.icmp6->icmp6_code; 3420 3421 if (icmptype == ICMP6_DST_UNREACH || 3422 icmptype == ICMP6_PACKET_TOO_BIG || 3423 icmptype == ICMP6_TIME_EXCEEDED || 3424 icmptype == ICMP6_PARAM_PROB) 3425 state_icmp++; 3426 break; 3427#endif /* INET6 */ 3428 default: 3429 sport = dport = hdrlen = 0; 3430 break; 3431 } 3432 3433 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3434 3435 /* check packet for BINAT/NAT/RDR */ 3436 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, 3437 &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) { 3438 if (nk == NULL || sk == NULL) { 3439 REASON_SET(&reason, PFRES_MEMORY); 3440 goto cleanup; 3441 } 3442 3443 if (pd->ip_sum) 3444 bip_sum = *pd->ip_sum; 3445 3446 switch (pd->proto) { 3447 case IPPROTO_TCP: 3448 bproto_sum = th->th_sum; 3449 pd->proto_sum = &th->th_sum; 3450 3451 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3452 nk->port[pd->sidx] != sport) { 3453 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum, 3454 &th->th_sum, &nk->addr[pd->sidx], 3455 nk->port[pd->sidx], 0, af); 3456 pd->sport = &th->th_sport; 3457 sport = th->th_sport; 3458 } 3459 3460 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3461 nk->port[pd->didx] != dport) { 3462 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum, 3463 &th->th_sum, &nk->addr[pd->didx], 3464 nk->port[pd->didx], 0, af); 3465 dport = th->th_dport; 3466 pd->dport = &th->th_dport; 3467 } 3468 rewrite++; 3469 break; 3470 case IPPROTO_UDP: 3471 bproto_sum = pd->hdr.udp->uh_sum; 3472 pd->proto_sum = &pd->hdr.udp->uh_sum; 3473 3474 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3475 nk->port[pd->sidx] != sport) { 3476 pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport, 3477 pd->ip_sum, &pd->hdr.udp->uh_sum, 3478 &nk->addr[pd->sidx], 3479 nk->port[pd->sidx], 1, af); 3480 sport = pd->hdr.udp->uh_sport; 3481 pd->sport = &pd->hdr.udp->uh_sport; 3482 } 3483 3484 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3485 nk->port[pd->didx] != dport) { 3486 pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport, 3487 pd->ip_sum, &pd->hdr.udp->uh_sum, 3488 &nk->addr[pd->didx], 3489 nk->port[pd->didx], 1, af); 3490 dport = pd->hdr.udp->uh_dport; 3491 pd->dport = &pd->hdr.udp->uh_dport; 3492 } 3493 rewrite++; 3494 break; 3495#ifdef INET 3496 case IPPROTO_ICMP: 3497 nk->port[0] = nk->port[1]; 3498 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3499 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3500 nk->addr[pd->sidx].v4.s_addr, 0); 3501 3502 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3503 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3504 nk->addr[pd->didx].v4.s_addr, 0); 3505 3506 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3507 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3508 pd->hdr.icmp->icmp_cksum, sport, 3509 nk->port[1], 0); 3510 pd->hdr.icmp->icmp_id = nk->port[1]; 3511 pd->sport = &pd->hdr.icmp->icmp_id; 3512 } 3513 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3514 break; 3515#endif /* INET */ 3516#ifdef INET6 3517 case IPPROTO_ICMPV6: 3518 nk->port[0] = nk->port[1]; 3519 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3520 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3521 &nk->addr[pd->sidx], 0); 3522 3523 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3524 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3525 &nk->addr[pd->didx], 0); 3526 rewrite++; 3527 break; 3528#endif /* INET */ 3529 default: 3530 switch (af) { 3531#ifdef INET 3532 case AF_INET: 3533 if (PF_ANEQ(saddr, 3534 &nk->addr[pd->sidx], AF_INET)) 3535 pf_change_a(&saddr->v4.s_addr, 3536 pd->ip_sum, 3537 nk->addr[pd->sidx].v4.s_addr, 0); 3538 3539 if (PF_ANEQ(daddr, 3540 &nk->addr[pd->didx], AF_INET)) 3541 pf_change_a(&daddr->v4.s_addr, 3542 pd->ip_sum, 3543 nk->addr[pd->didx].v4.s_addr, 0); 3544 break; 3545#endif /* INET */ 3546#ifdef INET6 3547 case AF_INET6: 3548 if (PF_ANEQ(saddr, 3549 &nk->addr[pd->sidx], AF_INET6)) 3550 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3551 3552 if (PF_ANEQ(daddr, 3553 &nk->addr[pd->didx], AF_INET6)) 3554 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3555 break; 3556#endif /* INET */ 3557 } 3558 break; 3559 } 3560 if (nr->natpass) 3561 r = NULL; 3562 pd->nat_rule = nr; 3563 } 3564 3565 while (r != NULL) { 3566 r->evaluations++; 3567 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3568 r = r->skip[PF_SKIP_IFP].ptr; 3569 else if (r->direction && r->direction != direction) 3570 r = r->skip[PF_SKIP_DIR].ptr; 3571 else if (r->af && r->af != af) 3572 r = r->skip[PF_SKIP_AF].ptr; 3573 else if (r->proto && r->proto != pd->proto) 3574 r = r->skip[PF_SKIP_PROTO].ptr; 3575 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3576 r->src.neg, kif, M_GETFIB(m))) 3577 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3578 /* tcp/udp only. port_op always 0 in other cases */ 3579 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3580 r->src.port[0], r->src.port[1], sport)) 3581 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3582 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3583 r->dst.neg, NULL, M_GETFIB(m))) 3584 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3585 /* tcp/udp only. port_op always 0 in other cases */ 3586 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3587 r->dst.port[0], r->dst.port[1], dport)) 3588 r = r->skip[PF_SKIP_DST_PORT].ptr; 3589 /* icmp only. type always 0 in other cases */ 3590 else if (r->type && r->type != icmptype + 1) 3591 r = TAILQ_NEXT(r, entries); 3592 /* icmp only. type always 0 in other cases */ 3593 else if (r->code && r->code != icmpcode + 1) 3594 r = TAILQ_NEXT(r, entries); 3595 else if (r->tos && !(r->tos == pd->tos)) 3596 r = TAILQ_NEXT(r, entries); 3597 else if (r->rule_flag & PFRULE_FRAGMENT) 3598 r = TAILQ_NEXT(r, entries); 3599 else if (pd->proto == IPPROTO_TCP && 3600 (r->flagset & th->th_flags) != r->flags) 3601 r = TAILQ_NEXT(r, entries); 3602 /* tcp/udp only. uid.op always 0 in other cases */ 3603 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3604#ifdef __FreeBSD__ 3605 pf_socket_lookup(direction, pd, inp), 1)) && 3606#else 3607 pf_socket_lookup(direction, pd), 1)) && 3608#endif 3609 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3610 pd->lookup.uid)) 3611 r = TAILQ_NEXT(r, entries); 3612 /* tcp/udp only. gid.op always 0 in other cases */ 3613 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3614#ifdef __FreeBSD__ 3615 pf_socket_lookup(direction, pd, inp), 1)) && 3616#else 3617 pf_socket_lookup(direction, pd), 1)) && 3618#endif 3619 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3620 pd->lookup.gid)) 3621 r = TAILQ_NEXT(r, entries); 3622 else if (r->prob && 3623#ifdef __FreeBSD__ 3624 r->prob <= arc4random()) 3625#else 3626 r->prob <= arc4random_uniform(UINT_MAX - 1) + 1) 3627#endif 3628 r = TAILQ_NEXT(r, entries); 3629#ifdef __FreeBSD__ 3630 else if (r->match_tag && !pf_match_tag(m, r, &tag, pd->pf_mtag)) 3631#else 3632 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 3633#endif 3634 r = TAILQ_NEXT(r, entries); 3635 else if (r->os_fingerprint != PF_OSFP_ANY && 3636 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3637 pf_osfp_fingerprint(pd, m, off, th), 3638 r->os_fingerprint))) 3639 r = TAILQ_NEXT(r, entries); 3640 else { 3641 if (r->tag) 3642 tag = r->tag; 3643 if (r->rtableid >= 0) 3644 rtableid = r->rtableid; 3645 if (r->anchor == NULL) { 3646 match = 1; 3647 *rm = r; 3648 *am = a; 3649 *rsm = ruleset; 3650 if ((*rm)->quick) 3651 break; 3652 r = TAILQ_NEXT(r, entries); 3653 } else 3654 pf_step_into_anchor(&asd, &ruleset, 3655 PF_RULESET_FILTER, &r, &a, &match); 3656 } 3657 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3658 PF_RULESET_FILTER, &r, &a, &match)) 3659 break; 3660 } 3661 r = *rm; 3662 a = *am; 3663 ruleset = *rsm; 3664 3665 REASON_SET(&reason, PFRES_MATCH); 3666 3667 if (r->log || (nr != NULL && nr->log)) { 3668 if (rewrite) 3669 m_copyback(m, off, hdrlen, pd->hdr.any); 3670 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3671 a, ruleset, pd); 3672 } 3673 3674 if ((r->action == PF_DROP) && 3675 ((r->rule_flag & PFRULE_RETURNRST) || 3676 (r->rule_flag & PFRULE_RETURNICMP) || 3677 (r->rule_flag & PFRULE_RETURN))) { 3678 /* undo NAT changes, if they have taken place */ 3679 if (nr != NULL) { 3680 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3681 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3682 if (pd->sport) 3683 *pd->sport = sk->port[pd->sidx]; 3684 if (pd->dport) 3685 *pd->dport = sk->port[pd->didx]; 3686 if (pd->proto_sum) 3687 *pd->proto_sum = bproto_sum; 3688 if (pd->ip_sum) 3689 *pd->ip_sum = bip_sum; 3690 m_copyback(m, off, hdrlen, pd->hdr.any); 3691 } 3692 if (pd->proto == IPPROTO_TCP && 3693 ((r->rule_flag & PFRULE_RETURNRST) || 3694 (r->rule_flag & PFRULE_RETURN)) && 3695 !(th->th_flags & TH_RST)) { 3696 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3697 int len = 0; 3698#ifdef INET 3699 struct ip *h4; 3700#endif 3701#ifdef INET6 3702 struct ip6_hdr *h6; 3703#endif 3704 3705 switch (af) { 3706#ifdef INET 3707 case AF_INET: 3708 h4 = mtod(m, struct ip *); 3709 len = ntohs(h4->ip_len) - off; 3710 break; 3711#endif 3712#ifdef INET6 3713 case AF_INET6: 3714 h6 = mtod(m, struct ip6_hdr *); 3715 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3716 break; 3717#endif 3718 } 3719 3720 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3721 REASON_SET(&reason, PFRES_PROTCKSUM); 3722 else { 3723 if (th->th_flags & TH_SYN) 3724 ack++; 3725 if (th->th_flags & TH_FIN) 3726 ack++; 3727#ifdef __FreeBSD__ 3728 pf_send_tcp(m, r, af, pd->dst, 3729#else 3730 pf_send_tcp(r, af, pd->dst, 3731#endif 3732 pd->src, th->th_dport, th->th_sport, 3733 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3734 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3735 } 3736 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3737 r->return_icmp) 3738 pf_send_icmp(m, r->return_icmp >> 8, 3739 r->return_icmp & 255, af, r); 3740 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3741 r->return_icmp6) 3742 pf_send_icmp(m, r->return_icmp6 >> 8, 3743 r->return_icmp6 & 255, af, r); 3744 } 3745 3746 if (r->action == PF_DROP) 3747 goto cleanup; 3748 3749#ifdef __FreeBSD__ 3750 if (pf_tag_packet(m, tag, rtableid, pd->pf_mtag)) { 3751#else 3752 if (pf_tag_packet(m, tag, rtableid)) { 3753#endif 3754 REASON_SET(&reason, PFRES_MEMORY); 3755 goto cleanup; 3756 } 3757 3758 if (!state_icmp && (r->keep_state || nr != NULL || 3759 (pd->flags & PFDESC_TCP_NORM))) { 3760 int action; 3761 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m, 3762 off, sport, dport, &rewrite, kif, sm, tag, bproto_sum, 3763 bip_sum, hdrlen); 3764 if (action != PF_PASS) 3765 return (action); 3766 } else { 3767#ifdef __FreeBSD__ 3768 if (sk != NULL) 3769 pool_put(&V_pf_state_key_pl, sk); 3770 if (nk != NULL) 3771 pool_put(&V_pf_state_key_pl, nk); 3772#else 3773 if (sk != NULL) 3774 pool_put(&pf_state_key_pl, sk); 3775 if (nk != NULL) 3776 pool_put(&pf_state_key_pl, nk); 3777#endif 3778 } 3779 3780 /* copy back packet headers if we performed NAT operations */ 3781 if (rewrite) 3782 m_copyback(m, off, hdrlen, pd->hdr.any); 3783 3784#if NPFSYNC > 0 3785 if (*sm != NULL && !ISSET((*sm)->state_flags, PFSTATE_NOSYNC) && 3786#ifdef __FreeBSD__ 3787 direction == PF_OUT && pfsync_up_ptr != NULL && pfsync_up_ptr()) { 3788#else 3789 direction == PF_OUT && pfsync_up()) { 3790#endif 3791 /* 3792 * We want the state created, but we dont 3793 * want to send this in case a partner 3794 * firewall has to know about it to allow 3795 * replies through it. 3796 */ 3797#ifdef __FreeBSD__ 3798 if (pfsync_defer_ptr != NULL && 3799 pfsync_defer_ptr(*sm, m)) 3800#else 3801 if (pfsync_defer(*sm, m)) 3802#endif 3803 return (PF_DEFER); 3804 } 3805#endif 3806 3807 return (PF_PASS); 3808 3809cleanup: 3810#ifdef __FreeBSD__ 3811 if (sk != NULL) 3812 pool_put(&V_pf_state_key_pl, sk); 3813 if (nk != NULL) 3814 pool_put(&V_pf_state_key_pl, nk); 3815#else 3816 if (sk != NULL) 3817 pool_put(&pf_state_key_pl, sk); 3818 if (nk != NULL) 3819 pool_put(&pf_state_key_pl, nk); 3820#endif 3821 return (PF_DROP); 3822} 3823 3824static __inline int 3825pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3826 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw, 3827 struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk, 3828 struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite, 3829 struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum, 3830 u_int16_t bip_sum, int hdrlen) 3831{ 3832 struct pf_state *s = NULL; 3833 struct pf_src_node *sn = NULL; 3834 struct tcphdr *th = pd->hdr.tcp; 3835#ifdef __FreeBSD__ 3836 u_int16_t mss = V_tcp_mssdflt; 3837#else 3838 u_int16_t mss = tcp_mssdflt; 3839#endif 3840 u_short reason; 3841 3842 /* check maximums */ 3843 if (r->max_states && (r->states_cur >= r->max_states)) { 3844#ifdef __FreeBSD__ 3845 V_pf_status.lcounters[LCNT_STATES]++; 3846#else 3847 pf_status.lcounters[LCNT_STATES]++; 3848#endif 3849 REASON_SET(&reason, PFRES_MAXSTATES); 3850 return (PF_DROP); 3851 } 3852 /* src node for filter rule */ 3853 if ((r->rule_flag & PFRULE_SRCTRACK || 3854 r->rpool.opts & PF_POOL_STICKYADDR) && 3855 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3856 REASON_SET(&reason, PFRES_SRCLIMIT); 3857 goto csfailed; 3858 } 3859 /* src node for translation rule */ 3860 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3861 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3862 REASON_SET(&reason, PFRES_SRCLIMIT); 3863 goto csfailed; 3864 } 3865#ifdef __FreeBSD__ 3866 s = pool_get(&V_pf_state_pl, PR_NOWAIT | PR_ZERO); 3867#else 3868 s = pool_get(&pf_state_pl, PR_NOWAIT | PR_ZERO); 3869#endif 3870 if (s == NULL) { 3871 REASON_SET(&reason, PFRES_MEMORY); 3872 goto csfailed; 3873 } 3874 s->rule.ptr = r; 3875 s->nat_rule.ptr = nr; 3876 s->anchor.ptr = a; 3877 STATE_INC_COUNTERS(s); 3878 if (r->allow_opts) 3879 s->state_flags |= PFSTATE_ALLOWOPTS; 3880 if (r->rule_flag & PFRULE_STATESLOPPY) 3881 s->state_flags |= PFSTATE_SLOPPY; 3882 if (r->rule_flag & PFRULE_PFLOW) 3883 s->state_flags |= PFSTATE_PFLOW; 3884 s->log = r->log & PF_LOG_ALL; 3885 s->sync_state = PFSYNC_S_NONE; 3886 if (nr != NULL) 3887 s->log |= nr->log & PF_LOG_ALL; 3888 switch (pd->proto) { 3889 case IPPROTO_TCP: 3890 s->src.seqlo = ntohl(th->th_seq); 3891 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3892 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3893 r->keep_state == PF_STATE_MODULATE) { 3894 /* Generate sequence number modulator */ 3895 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3896 0) 3897 s->src.seqdiff = 1; 3898 pf_change_proto_a(m, &th->th_seq, &th->th_sum, 3899 htonl(s->src.seqlo + s->src.seqdiff), 0); 3900 *rewrite = 1; 3901 } else 3902 s->src.seqdiff = 0; 3903 if (th->th_flags & TH_SYN) { 3904 s->src.seqhi++; 3905 s->src.wscale = pf_get_wscale(m, off, 3906 th->th_off, pd->af); 3907 } 3908 s->src.max_win = MAX(ntohs(th->th_win), 1); 3909 if (s->src.wscale & PF_WSCALE_MASK) { 3910 /* Remove scale factor from initial window */ 3911 int win = s->src.max_win; 3912 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3913 s->src.max_win = (win - 1) >> 3914 (s->src.wscale & PF_WSCALE_MASK); 3915 } 3916 if (th->th_flags & TH_FIN) 3917 s->src.seqhi++; 3918 s->dst.seqhi = 1; 3919 s->dst.max_win = 1; 3920 s->src.state = TCPS_SYN_SENT; 3921 s->dst.state = TCPS_CLOSED; 3922 s->timeout = PFTM_TCP_FIRST_PACKET; 3923 break; 3924 case IPPROTO_UDP: 3925 s->src.state = PFUDPS_SINGLE; 3926 s->dst.state = PFUDPS_NO_TRAFFIC; 3927 s->timeout = PFTM_UDP_FIRST_PACKET; 3928 break; 3929 case IPPROTO_ICMP: 3930#ifdef INET6 3931 case IPPROTO_ICMPV6: 3932#endif 3933 s->timeout = PFTM_ICMP_FIRST_PACKET; 3934 break; 3935 default: 3936 s->src.state = PFOTHERS_SINGLE; 3937 s->dst.state = PFOTHERS_NO_TRAFFIC; 3938 s->timeout = PFTM_OTHER_FIRST_PACKET; 3939 } 3940 3941 s->creation = time_second; 3942 s->expire = time_second; 3943 3944 if (sn != NULL) { 3945 s->src_node = sn; 3946 s->src_node->states++; 3947 } 3948 if (nsn != NULL) { 3949 /* XXX We only modify one side for now. */ 3950 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3951 s->nat_src_node = nsn; 3952 s->nat_src_node->states++; 3953 } 3954 if (pd->proto == IPPROTO_TCP) { 3955 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3956 off, pd, th, &s->src, &s->dst)) { 3957 REASON_SET(&reason, PFRES_MEMORY); 3958 pf_src_tree_remove_state(s); 3959 STATE_DEC_COUNTERS(s); 3960#ifdef __FreeBSD__ 3961 pool_put(&V_pf_state_pl, s); 3962#else 3963 pool_put(&pf_state_pl, s); 3964#endif 3965 return (PF_DROP); 3966 } 3967 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3968 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3969 &s->src, &s->dst, rewrite)) { 3970 /* This really shouldn't happen!!! */ 3971 DPFPRINTF(PF_DEBUG_URGENT, 3972 ("pf_normalize_tcp_stateful failed on first pkt")); 3973 pf_normalize_tcp_cleanup(s); 3974 pf_src_tree_remove_state(s); 3975 STATE_DEC_COUNTERS(s); 3976#ifdef __FreeBSD__ 3977 pool_put(&V_pf_state_pl, s); 3978#else 3979 pool_put(&pf_state_pl, s); 3980#endif 3981 return (PF_DROP); 3982 } 3983 } 3984 s->direction = pd->dir; 3985 3986 if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk, 3987 pd->src, pd->dst, sport, dport)) 3988 goto csfailed; 3989 3990 if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) { 3991 if (pd->proto == IPPROTO_TCP) 3992 pf_normalize_tcp_cleanup(s); 3993 REASON_SET(&reason, PFRES_STATEINS); 3994 pf_src_tree_remove_state(s); 3995 STATE_DEC_COUNTERS(s); 3996#ifdef __FreeBSD__ 3997 pool_put(&V_pf_state_pl, s); 3998#else 3999 pool_put(&pf_state_pl, s); 4000#endif 4001 return (PF_DROP); 4002 } else 4003 *sm = s; 4004 4005 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 4006 if (tag > 0) { 4007 pf_tag_ref(tag); 4008 s->tag = tag; 4009 } 4010 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 4011 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 4012 s->src.state = PF_TCPS_PROXY_SRC; 4013 /* undo NAT changes, if they have taken place */ 4014 if (nr != NULL) { 4015 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 4016 if (pd->dir == PF_OUT) 4017 skt = s->key[PF_SK_STACK]; 4018 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 4019 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 4020 if (pd->sport) 4021 *pd->sport = skt->port[pd->sidx]; 4022 if (pd->dport) 4023 *pd->dport = skt->port[pd->didx]; 4024 if (pd->proto_sum) 4025 *pd->proto_sum = bproto_sum; 4026 if (pd->ip_sum) 4027 *pd->ip_sum = bip_sum; 4028 m_copyback(m, off, hdrlen, pd->hdr.any); 4029 } 4030 s->src.seqhi = htonl(arc4random()); 4031 /* Find mss option */ 4032 int rtid = M_GETFIB(m); 4033 mss = pf_get_mss(m, off, th->th_off, pd->af); 4034 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 4035 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 4036 s->src.mss = mss; 4037#ifdef __FreeBSD__ 4038 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 4039#else 4040 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 4041#endif 4042 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 4043 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 4044 REASON_SET(&reason, PFRES_SYNPROXY); 4045 return (PF_SYNPROXY_DROP); 4046 } 4047 4048 return (PF_PASS); 4049 4050csfailed: 4051#ifdef __FreeBSD__ 4052 if (sk != NULL) 4053 pool_put(&V_pf_state_key_pl, sk); 4054 if (nk != NULL) 4055 pool_put(&V_pf_state_key_pl, nk); 4056#else 4057 if (sk != NULL) 4058 pool_put(&pf_state_key_pl, sk); 4059 if (nk != NULL) 4060 pool_put(&pf_state_key_pl, nk); 4061#endif 4062 4063 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4064#ifdef __FreeBSD__ 4065 RB_REMOVE(pf_src_tree, &V_tree_src_tracking, sn); 4066 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4067 V_pf_status.src_nodes--; 4068 pool_put(&V_pf_src_tree_pl, sn); 4069#else 4070 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4071 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4072 pf_status.src_nodes--; 4073 pool_put(&pf_src_tree_pl, sn); 4074#endif 4075 } 4076 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 4077#ifdef __FreeBSD__ 4078 RB_REMOVE(pf_src_tree, &V_tree_src_tracking, nsn); 4079 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4080 V_pf_status.src_nodes--; 4081 pool_put(&V_pf_src_tree_pl, nsn); 4082#else 4083 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4084 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4085 pf_status.src_nodes--; 4086 pool_put(&pf_src_tree_pl, nsn); 4087#endif 4088 } 4089 return (PF_DROP); 4090} 4091 4092int 4093pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4094 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4095 struct pf_ruleset **rsm) 4096{ 4097 struct pf_rule *r, *a = NULL; 4098 struct pf_ruleset *ruleset = NULL; 4099 sa_family_t af = pd->af; 4100 u_short reason; 4101 int tag = -1; 4102 int asd = 0; 4103 int match = 0; 4104 4105 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4106 while (r != NULL) { 4107 r->evaluations++; 4108 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4109 r = r->skip[PF_SKIP_IFP].ptr; 4110 else if (r->direction && r->direction != direction) 4111 r = r->skip[PF_SKIP_DIR].ptr; 4112 else if (r->af && r->af != af) 4113 r = r->skip[PF_SKIP_AF].ptr; 4114 else if (r->proto && r->proto != pd->proto) 4115 r = r->skip[PF_SKIP_PROTO].ptr; 4116 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4117 r->src.neg, kif, M_GETFIB(m))) 4118 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4119 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4120 r->dst.neg, NULL, M_GETFIB(m))) 4121 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4122 else if (r->tos && !(r->tos == pd->tos)) 4123 r = TAILQ_NEXT(r, entries); 4124 else if (r->os_fingerprint != PF_OSFP_ANY) 4125 r = TAILQ_NEXT(r, entries); 4126 else if (pd->proto == IPPROTO_UDP && 4127 (r->src.port_op || r->dst.port_op)) 4128 r = TAILQ_NEXT(r, entries); 4129 else if (pd->proto == IPPROTO_TCP && 4130 (r->src.port_op || r->dst.port_op || r->flagset)) 4131 r = TAILQ_NEXT(r, entries); 4132 else if ((pd->proto == IPPROTO_ICMP || 4133 pd->proto == IPPROTO_ICMPV6) && 4134 (r->type || r->code)) 4135 r = TAILQ_NEXT(r, entries); 4136 else if (r->prob && r->prob <= 4137 (arc4random() % (UINT_MAX - 1) + 1)) 4138 r = TAILQ_NEXT(r, entries); 4139#ifdef __FreeBSD__ 4140 else if (r->match_tag && !pf_match_tag(m, r, &tag, pd->pf_mtag)) 4141#else 4142 else if (r->match_tag && !pf_match_tag(m, r, &tag)) 4143#endif 4144 r = TAILQ_NEXT(r, entries); 4145 else { 4146 if (r->anchor == NULL) { 4147 match = 1; 4148 *rm = r; 4149 *am = a; 4150 *rsm = ruleset; 4151 if ((*rm)->quick) 4152 break; 4153 r = TAILQ_NEXT(r, entries); 4154 } else 4155 pf_step_into_anchor(&asd, &ruleset, 4156 PF_RULESET_FILTER, &r, &a, &match); 4157 } 4158 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4159 PF_RULESET_FILTER, &r, &a, &match)) 4160 break; 4161 } 4162 r = *rm; 4163 a = *am; 4164 ruleset = *rsm; 4165 4166 REASON_SET(&reason, PFRES_MATCH); 4167 4168 if (r->log) 4169 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 4170 pd); 4171 4172 if (r->action != PF_PASS) 4173 return (PF_DROP); 4174 4175#ifdef __FreeBSD__ 4176 if (pf_tag_packet(m, tag, -1, pd->pf_mtag)) { 4177#else 4178 if (pf_tag_packet(m, tag, -1)) { 4179#endif 4180 REASON_SET(&reason, PFRES_MEMORY); 4181 return (PF_DROP); 4182 } 4183 4184 return (PF_PASS); 4185} 4186 4187int 4188pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 4189 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 4190 struct pf_pdesc *pd, u_short *reason, int *copyback) 4191{ 4192 struct tcphdr *th = pd->hdr.tcp; 4193 u_int16_t win = ntohs(th->th_win); 4194 u_int32_t ack, end, seq, orig_seq; 4195 u_int8_t sws, dws; 4196 int ackskew; 4197 4198 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4199 sws = src->wscale & PF_WSCALE_MASK; 4200 dws = dst->wscale & PF_WSCALE_MASK; 4201 } else 4202 sws = dws = 0; 4203 4204 /* 4205 * Sequence tracking algorithm from Guido van Rooij's paper: 4206 * http://www.madison-gurkha.com/publications/tcp_filtering/ 4207 * tcp_filtering.ps 4208 */ 4209 4210 orig_seq = seq = ntohl(th->th_seq); 4211 if (src->seqlo == 0) { 4212 /* First packet from this end. Set its state */ 4213 4214 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4215 src->scrub == NULL) { 4216 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4217 REASON_SET(reason, PFRES_MEMORY); 4218 return (PF_DROP); 4219 } 4220 } 4221 4222 /* Deferred generation of sequence number modulator */ 4223 if (dst->seqdiff && !src->seqdiff) { 4224 /* use random iss for the TCP server */ 4225 while ((src->seqdiff = arc4random() - seq) == 0) 4226 ; 4227 ack = ntohl(th->th_ack) - dst->seqdiff; 4228 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 4229 src->seqdiff), 0); 4230 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 4231 *copyback = 1; 4232 } else { 4233 ack = ntohl(th->th_ack); 4234 } 4235 4236 end = seq + pd->p_len; 4237 if (th->th_flags & TH_SYN) { 4238 end++; 4239 if (dst->wscale & PF_WSCALE_FLAG) { 4240 src->wscale = pf_get_wscale(m, off, th->th_off, 4241 pd->af); 4242 if (src->wscale & PF_WSCALE_FLAG) { 4243 /* Remove scale factor from initial 4244 * window */ 4245 sws = src->wscale & PF_WSCALE_MASK; 4246 win = ((u_int32_t)win + (1 << sws) - 1) 4247 >> sws; 4248 dws = dst->wscale & PF_WSCALE_MASK; 4249 } else { 4250 /* fixup other window */ 4251 dst->max_win <<= dst->wscale & 4252 PF_WSCALE_MASK; 4253 /* in case of a retrans SYN|ACK */ 4254 dst->wscale = 0; 4255 } 4256 } 4257 } 4258 if (th->th_flags & TH_FIN) 4259 end++; 4260 4261 src->seqlo = seq; 4262 if (src->state < TCPS_SYN_SENT) 4263 src->state = TCPS_SYN_SENT; 4264 4265 /* 4266 * May need to slide the window (seqhi may have been set by 4267 * the crappy stack check or if we picked up the connection 4268 * after establishment) 4269 */ 4270 if (src->seqhi == 1 || 4271 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4272 src->seqhi = end + MAX(1, dst->max_win << dws); 4273 if (win > src->max_win) 4274 src->max_win = win; 4275 4276 } else { 4277 ack = ntohl(th->th_ack) - dst->seqdiff; 4278 if (src->seqdiff) { 4279 /* Modulate sequence numbers */ 4280 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 4281 src->seqdiff), 0); 4282 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 4283 *copyback = 1; 4284 } 4285 end = seq + pd->p_len; 4286 if (th->th_flags & TH_SYN) 4287 end++; 4288 if (th->th_flags & TH_FIN) 4289 end++; 4290 } 4291 4292 if ((th->th_flags & TH_ACK) == 0) { 4293 /* Let it pass through the ack skew check */ 4294 ack = dst->seqlo; 4295 } else if ((ack == 0 && 4296 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4297 /* broken tcp stacks do not set ack */ 4298 (dst->state < TCPS_SYN_SENT)) { 4299 /* 4300 * Many stacks (ours included) will set the ACK number in an 4301 * FIN|ACK if the SYN times out -- no sequence to ACK. 4302 */ 4303 ack = dst->seqlo; 4304 } 4305 4306 if (seq == end) { 4307 /* Ease sequencing restrictions on no data packets */ 4308 seq = src->seqlo; 4309 end = seq; 4310 } 4311 4312 ackskew = dst->seqlo - ack; 4313 4314 4315 /* 4316 * Need to demodulate the sequence numbers in any TCP SACK options 4317 * (Selective ACK). We could optionally validate the SACK values 4318 * against the current ACK window, either forwards or backwards, but 4319 * I'm not confident that SACK has been implemented properly 4320 * everywhere. It wouldn't surprise me if several stacks accidently 4321 * SACK too far backwards of previously ACKed data. There really aren't 4322 * any security implications of bad SACKing unless the target stack 4323 * doesn't validate the option length correctly. Someone trying to 4324 * spoof into a TCP connection won't bother blindly sending SACK 4325 * options anyway. 4326 */ 4327 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4328 if (pf_modulate_sack(m, off, pd, th, dst)) 4329 *copyback = 1; 4330 } 4331 4332 4333#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4334 if (SEQ_GEQ(src->seqhi, end) && 4335 /* Last octet inside other's window space */ 4336 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4337 /* Retrans: not more than one window back */ 4338 (ackskew >= -MAXACKWINDOW) && 4339 /* Acking not more than one reassembled fragment backwards */ 4340 (ackskew <= (MAXACKWINDOW << sws)) && 4341 /* Acking not more than one window forward */ 4342 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4343 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4344 (pd->flags & PFDESC_IP_REAS) == 0)) { 4345 /* Require an exact/+1 sequence match on resets when possible */ 4346 4347 if (dst->scrub || src->scrub) { 4348 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4349 *state, src, dst, copyback)) 4350 return (PF_DROP); 4351 } 4352 4353 /* update max window */ 4354 if (src->max_win < win) 4355 src->max_win = win; 4356 /* synchronize sequencing */ 4357 if (SEQ_GT(end, src->seqlo)) 4358 src->seqlo = end; 4359 /* slide the window of what the other end can send */ 4360 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4361 dst->seqhi = ack + MAX((win << sws), 1); 4362 4363 4364 /* update states */ 4365 if (th->th_flags & TH_SYN) 4366 if (src->state < TCPS_SYN_SENT) 4367 src->state = TCPS_SYN_SENT; 4368 if (th->th_flags & TH_FIN) 4369 if (src->state < TCPS_CLOSING) 4370 src->state = TCPS_CLOSING; 4371 if (th->th_flags & TH_ACK) { 4372 if (dst->state == TCPS_SYN_SENT) { 4373 dst->state = TCPS_ESTABLISHED; 4374 if (src->state == TCPS_ESTABLISHED && 4375 (*state)->src_node != NULL && 4376 pf_src_connlimit(state)) { 4377 REASON_SET(reason, PFRES_SRCLIMIT); 4378 return (PF_DROP); 4379 } 4380 } else if (dst->state == TCPS_CLOSING) 4381 dst->state = TCPS_FIN_WAIT_2; 4382 } 4383 if (th->th_flags & TH_RST) 4384 src->state = dst->state = TCPS_TIME_WAIT; 4385 4386 /* update expire time */ 4387 (*state)->expire = time_second; 4388 if (src->state >= TCPS_FIN_WAIT_2 && 4389 dst->state >= TCPS_FIN_WAIT_2) 4390 (*state)->timeout = PFTM_TCP_CLOSED; 4391 else if (src->state >= TCPS_CLOSING && 4392 dst->state >= TCPS_CLOSING) 4393 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4394 else if (src->state < TCPS_ESTABLISHED || 4395 dst->state < TCPS_ESTABLISHED) 4396 (*state)->timeout = PFTM_TCP_OPENING; 4397 else if (src->state >= TCPS_CLOSING || 4398 dst->state >= TCPS_CLOSING) 4399 (*state)->timeout = PFTM_TCP_CLOSING; 4400 else 4401 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4402 4403 /* Fall through to PASS packet */ 4404 4405 } else if ((dst->state < TCPS_SYN_SENT || 4406 dst->state >= TCPS_FIN_WAIT_2 || 4407 src->state >= TCPS_FIN_WAIT_2) && 4408 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4409 /* Within a window forward of the originating packet */ 4410 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4411 /* Within a window backward of the originating packet */ 4412 4413 /* 4414 * This currently handles three situations: 4415 * 1) Stupid stacks will shotgun SYNs before their peer 4416 * replies. 4417 * 2) When PF catches an already established stream (the 4418 * firewall rebooted, the state table was flushed, routes 4419 * changed...) 4420 * 3) Packets get funky immediately after the connection 4421 * closes (this should catch Solaris spurious ACK|FINs 4422 * that web servers like to spew after a close) 4423 * 4424 * This must be a little more careful than the above code 4425 * since packet floods will also be caught here. We don't 4426 * update the TTL here to mitigate the damage of a packet 4427 * flood and so the same code can handle awkward establishment 4428 * and a loosened connection close. 4429 * In the establishment case, a correct peer response will 4430 * validate the connection, go through the normal state code 4431 * and keep updating the state TTL. 4432 */ 4433 4434#ifdef __FreeBSD__ 4435 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4436#else 4437 if (pf_status.debug >= PF_DEBUG_MISC) { 4438#endif 4439 printf("pf: loose state match: "); 4440 pf_print_state(*state); 4441 pf_print_flags(th->th_flags); 4442 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4443 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4444#ifdef __FreeBSD__ 4445 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4446 (unsigned long long)(*state)->packets[1], 4447#else 4448 pd->p_len, ackskew, (*state)->packets[0], 4449 (*state)->packets[1], 4450#endif 4451 pd->dir == PF_IN ? "in" : "out", 4452 pd->dir == (*state)->direction ? "fwd" : "rev"); 4453 } 4454 4455 if (dst->scrub || src->scrub) { 4456 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4457 *state, src, dst, copyback)) 4458 return (PF_DROP); 4459 } 4460 4461 /* update max window */ 4462 if (src->max_win < win) 4463 src->max_win = win; 4464 /* synchronize sequencing */ 4465 if (SEQ_GT(end, src->seqlo)) 4466 src->seqlo = end; 4467 /* slide the window of what the other end can send */ 4468 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4469 dst->seqhi = ack + MAX((win << sws), 1); 4470 4471 /* 4472 * Cannot set dst->seqhi here since this could be a shotgunned 4473 * SYN and not an already established connection. 4474 */ 4475 4476 if (th->th_flags & TH_FIN) 4477 if (src->state < TCPS_CLOSING) 4478 src->state = TCPS_CLOSING; 4479 if (th->th_flags & TH_RST) 4480 src->state = dst->state = TCPS_TIME_WAIT; 4481 4482 /* Fall through to PASS packet */ 4483 4484 } else { 4485 if ((*state)->dst.state == TCPS_SYN_SENT && 4486 (*state)->src.state == TCPS_SYN_SENT) { 4487 /* Send RST for state mismatches during handshake */ 4488 if (!(th->th_flags & TH_RST)) 4489#ifdef __FreeBSD__ 4490 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4491#else 4492 pf_send_tcp((*state)->rule.ptr, pd->af, 4493#endif 4494 pd->dst, pd->src, th->th_dport, 4495 th->th_sport, ntohl(th->th_ack), 0, 4496 TH_RST, 0, 0, 4497 (*state)->rule.ptr->return_ttl, 1, 0, 4498 pd->eh, kif->pfik_ifp); 4499 src->seqlo = 0; 4500 src->seqhi = 1; 4501 src->max_win = 1; 4502#ifdef __FreeBSD__ 4503 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4504#else 4505 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4506#endif 4507 printf("pf: BAD state: "); 4508 pf_print_state(*state); 4509 pf_print_flags(th->th_flags); 4510 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4511 "pkts=%llu:%llu dir=%s,%s\n", 4512 seq, orig_seq, ack, pd->p_len, ackskew, 4513#ifdef __FreeBSD__ 4514 (unsigned long long)(*state)->packets[0], 4515 (unsigned long long)(*state)->packets[1], 4516#else 4517 (*state)->packets[0], (*state)->packets[1], 4518#endif 4519 pd->dir == PF_IN ? "in" : "out", 4520 pd->dir == (*state)->direction ? "fwd" : "rev"); 4521 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4522 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4523 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4524 ' ': '2', 4525 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4526 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4527 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4528 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4529 } 4530 REASON_SET(reason, PFRES_BADSTATE); 4531 return (PF_DROP); 4532 } 4533 4534 return (PF_PASS); 4535} 4536 4537int 4538pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4539 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4540{ 4541 struct tcphdr *th = pd->hdr.tcp; 4542 4543 if (th->th_flags & TH_SYN) 4544 if (src->state < TCPS_SYN_SENT) 4545 src->state = TCPS_SYN_SENT; 4546 if (th->th_flags & TH_FIN) 4547 if (src->state < TCPS_CLOSING) 4548 src->state = TCPS_CLOSING; 4549 if (th->th_flags & TH_ACK) { 4550 if (dst->state == TCPS_SYN_SENT) { 4551 dst->state = TCPS_ESTABLISHED; 4552 if (src->state == TCPS_ESTABLISHED && 4553 (*state)->src_node != NULL && 4554 pf_src_connlimit(state)) { 4555 REASON_SET(reason, PFRES_SRCLIMIT); 4556 return (PF_DROP); 4557 } 4558 } else if (dst->state == TCPS_CLOSING) { 4559 dst->state = TCPS_FIN_WAIT_2; 4560 } else if (src->state == TCPS_SYN_SENT && 4561 dst->state < TCPS_SYN_SENT) { 4562 /* 4563 * Handle a special sloppy case where we only see one 4564 * half of the connection. If there is a ACK after 4565 * the initial SYN without ever seeing a packet from 4566 * the destination, set the connection to established. 4567 */ 4568 dst->state = src->state = TCPS_ESTABLISHED; 4569 if ((*state)->src_node != NULL && 4570 pf_src_connlimit(state)) { 4571 REASON_SET(reason, PFRES_SRCLIMIT); 4572 return (PF_DROP); 4573 } 4574 } else if (src->state == TCPS_CLOSING && 4575 dst->state == TCPS_ESTABLISHED && 4576 dst->seqlo == 0) { 4577 /* 4578 * Handle the closing of half connections where we 4579 * don't see the full bidirectional FIN/ACK+ACK 4580 * handshake. 4581 */ 4582 dst->state = TCPS_CLOSING; 4583 } 4584 } 4585 if (th->th_flags & TH_RST) 4586 src->state = dst->state = TCPS_TIME_WAIT; 4587 4588 /* update expire time */ 4589 (*state)->expire = time_second; 4590 if (src->state >= TCPS_FIN_WAIT_2 && 4591 dst->state >= TCPS_FIN_WAIT_2) 4592 (*state)->timeout = PFTM_TCP_CLOSED; 4593 else if (src->state >= TCPS_CLOSING && 4594 dst->state >= TCPS_CLOSING) 4595 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4596 else if (src->state < TCPS_ESTABLISHED || 4597 dst->state < TCPS_ESTABLISHED) 4598 (*state)->timeout = PFTM_TCP_OPENING; 4599 else if (src->state >= TCPS_CLOSING || 4600 dst->state >= TCPS_CLOSING) 4601 (*state)->timeout = PFTM_TCP_CLOSING; 4602 else 4603 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4604 4605 return (PF_PASS); 4606} 4607 4608int 4609pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4610 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4611 u_short *reason) 4612{ 4613 struct pf_state_key_cmp key; 4614 struct tcphdr *th = pd->hdr.tcp; 4615 int copyback = 0; 4616 struct pf_state_peer *src, *dst; 4617 struct pf_state_key *sk; 4618 4619 key.af = pd->af; 4620 key.proto = IPPROTO_TCP; 4621 if (direction == PF_IN) { /* wire side, straight */ 4622 PF_ACPY(&key.addr[0], pd->src, key.af); 4623 PF_ACPY(&key.addr[1], pd->dst, key.af); 4624 key.port[0] = th->th_sport; 4625 key.port[1] = th->th_dport; 4626 } else { /* stack side, reverse */ 4627 PF_ACPY(&key.addr[1], pd->src, key.af); 4628 PF_ACPY(&key.addr[0], pd->dst, key.af); 4629 key.port[1] = th->th_sport; 4630 key.port[0] = th->th_dport; 4631 } 4632 4633#ifdef __FreeBSD__ 4634 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 4635#else 4636 STATE_LOOKUP(kif, &key, direction, *state, m); 4637#endif 4638 4639 if (direction == (*state)->direction) { 4640 src = &(*state)->src; 4641 dst = &(*state)->dst; 4642 } else { 4643 src = &(*state)->dst; 4644 dst = &(*state)->src; 4645 } 4646 4647 sk = (*state)->key[pd->didx]; 4648 4649 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4650 if (direction != (*state)->direction) { 4651 REASON_SET(reason, PFRES_SYNPROXY); 4652 return (PF_SYNPROXY_DROP); 4653 } 4654 if (th->th_flags & TH_SYN) { 4655 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4656 REASON_SET(reason, PFRES_SYNPROXY); 4657 return (PF_DROP); 4658 } 4659#ifdef __FreeBSD__ 4660 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4661#else 4662 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4663#endif 4664 pd->src, th->th_dport, th->th_sport, 4665 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4666 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 4667 0, NULL, NULL); 4668 REASON_SET(reason, PFRES_SYNPROXY); 4669 return (PF_SYNPROXY_DROP); 4670 } else if (!(th->th_flags & TH_ACK) || 4671 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4672 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4673 REASON_SET(reason, PFRES_SYNPROXY); 4674 return (PF_DROP); 4675 } else if ((*state)->src_node != NULL && 4676 pf_src_connlimit(state)) { 4677 REASON_SET(reason, PFRES_SRCLIMIT); 4678 return (PF_DROP); 4679 } else 4680 (*state)->src.state = PF_TCPS_PROXY_DST; 4681 } 4682 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4683 if (direction == (*state)->direction) { 4684 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4685 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4686 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4687 REASON_SET(reason, PFRES_SYNPROXY); 4688 return (PF_DROP); 4689 } 4690 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4691 if ((*state)->dst.seqhi == 1) 4692 (*state)->dst.seqhi = htonl(arc4random()); 4693#ifdef __FreeBSD__ 4694 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4695#else 4696 pf_send_tcp((*state)->rule.ptr, pd->af, 4697#endif 4698 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4699 sk->port[pd->sidx], sk->port[pd->didx], 4700 (*state)->dst.seqhi, 0, TH_SYN, 0, 4701 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 4702 REASON_SET(reason, PFRES_SYNPROXY); 4703 return (PF_SYNPROXY_DROP); 4704 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4705 (TH_SYN|TH_ACK)) || 4706 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4707 REASON_SET(reason, PFRES_SYNPROXY); 4708 return (PF_DROP); 4709 } else { 4710 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4711 (*state)->dst.seqlo = ntohl(th->th_seq); 4712#ifdef __FreeBSD__ 4713 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4714#else 4715 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4716#endif 4717 pd->src, th->th_dport, th->th_sport, 4718 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4719 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4720 (*state)->tag, NULL, NULL); 4721#ifdef __FreeBSD__ 4722 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4723#else 4724 pf_send_tcp((*state)->rule.ptr, pd->af, 4725#endif 4726 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4727 sk->port[pd->sidx], sk->port[pd->didx], 4728 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4729 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 4730 0, NULL, NULL); 4731 (*state)->src.seqdiff = (*state)->dst.seqhi - 4732 (*state)->src.seqlo; 4733 (*state)->dst.seqdiff = (*state)->src.seqhi - 4734 (*state)->dst.seqlo; 4735 (*state)->src.seqhi = (*state)->src.seqlo + 4736 (*state)->dst.max_win; 4737 (*state)->dst.seqhi = (*state)->dst.seqlo + 4738 (*state)->src.max_win; 4739 (*state)->src.wscale = (*state)->dst.wscale = 0; 4740 (*state)->src.state = (*state)->dst.state = 4741 TCPS_ESTABLISHED; 4742 REASON_SET(reason, PFRES_SYNPROXY); 4743 return (PF_SYNPROXY_DROP); 4744 } 4745 } 4746 4747 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4748 dst->state >= TCPS_FIN_WAIT_2 && 4749 src->state >= TCPS_FIN_WAIT_2) { 4750#ifdef __FreeBSD__ 4751 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4752#else 4753 if (pf_status.debug >= PF_DEBUG_MISC) { 4754#endif 4755 printf("pf: state reuse "); 4756 pf_print_state(*state); 4757 pf_print_flags(th->th_flags); 4758 printf("\n"); 4759 } 4760 /* XXX make sure it's the same direction ?? */ 4761 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4762 pf_unlink_state(*state); 4763 *state = NULL; 4764 return (PF_DROP); 4765 } 4766 4767 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4768 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4769 return (PF_DROP); 4770 } else { 4771 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4772 ©back) == PF_DROP) 4773 return (PF_DROP); 4774 } 4775 4776 /* translate source/destination address, if necessary */ 4777 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4778 struct pf_state_key *nk = (*state)->key[pd->didx]; 4779 4780 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4781 nk->port[pd->sidx] != th->th_sport) 4782 pf_change_ap(m, pd->src, &th->th_sport, 4783 pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], 4784 nk->port[pd->sidx], 0, pd->af); 4785 4786 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4787 nk->port[pd->didx] != th->th_dport) 4788 pf_change_ap(m, pd->dst, &th->th_dport, 4789 pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], 4790 nk->port[pd->didx], 0, pd->af); 4791 copyback = 1; 4792 } 4793 4794 /* Copyback sequence modulation or stateful scrub changes if needed */ 4795 if (copyback) 4796#ifdef __FreeBSD__ 4797 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4798#else 4799 m_copyback(m, off, sizeof(*th), th); 4800#endif 4801 4802 return (PF_PASS); 4803} 4804 4805int 4806pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4807 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4808{ 4809 struct pf_state_peer *src, *dst; 4810 struct pf_state_key_cmp key; 4811 struct udphdr *uh = pd->hdr.udp; 4812 4813 key.af = pd->af; 4814 key.proto = IPPROTO_UDP; 4815 if (direction == PF_IN) { /* wire side, straight */ 4816 PF_ACPY(&key.addr[0], pd->src, key.af); 4817 PF_ACPY(&key.addr[1], pd->dst, key.af); 4818 key.port[0] = uh->uh_sport; 4819 key.port[1] = uh->uh_dport; 4820 } else { /* stack side, reverse */ 4821 PF_ACPY(&key.addr[1], pd->src, key.af); 4822 PF_ACPY(&key.addr[0], pd->dst, key.af); 4823 key.port[1] = uh->uh_sport; 4824 key.port[0] = uh->uh_dport; 4825 } 4826 4827#ifdef __FreeBSD__ 4828 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 4829#else 4830 STATE_LOOKUP(kif, &key, direction, *state, m); 4831#endif 4832 4833 if (direction == (*state)->direction) { 4834 src = &(*state)->src; 4835 dst = &(*state)->dst; 4836 } else { 4837 src = &(*state)->dst; 4838 dst = &(*state)->src; 4839 } 4840 4841 /* update states */ 4842 if (src->state < PFUDPS_SINGLE) 4843 src->state = PFUDPS_SINGLE; 4844 if (dst->state == PFUDPS_SINGLE) 4845 dst->state = PFUDPS_MULTIPLE; 4846 4847 /* update expire time */ 4848 (*state)->expire = time_second; 4849 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4850 (*state)->timeout = PFTM_UDP_MULTIPLE; 4851 else 4852 (*state)->timeout = PFTM_UDP_SINGLE; 4853 4854 /* translate source/destination address, if necessary */ 4855 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4856 struct pf_state_key *nk = (*state)->key[pd->didx]; 4857 4858 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4859 nk->port[pd->sidx] != uh->uh_sport) 4860 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 4861 &uh->uh_sum, &nk->addr[pd->sidx], 4862 nk->port[pd->sidx], 1, pd->af); 4863 4864 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4865 nk->port[pd->didx] != uh->uh_dport) 4866 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 4867 &uh->uh_sum, &nk->addr[pd->didx], 4868 nk->port[pd->didx], 1, pd->af); 4869#ifdef __FreeBSD__ 4870 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4871#else 4872 m_copyback(m, off, sizeof(*uh), uh); 4873#endif 4874 } 4875 4876 return (PF_PASS); 4877} 4878 4879int 4880pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4881 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4882{ 4883 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4884#ifdef __FreeBSD__ 4885 u_int16_t icmpid = 0, *icmpsum; 4886#else 4887 u_int16_t icmpid, *icmpsum; 4888#endif 4889 u_int8_t icmptype; 4890 int state_icmp = 0; 4891 struct pf_state_key_cmp key; 4892 4893 switch (pd->proto) { 4894#ifdef INET 4895 case IPPROTO_ICMP: 4896 icmptype = pd->hdr.icmp->icmp_type; 4897 icmpid = pd->hdr.icmp->icmp_id; 4898 icmpsum = &pd->hdr.icmp->icmp_cksum; 4899 4900 if (icmptype == ICMP_UNREACH || 4901 icmptype == ICMP_SOURCEQUENCH || 4902 icmptype == ICMP_REDIRECT || 4903 icmptype == ICMP_TIMXCEED || 4904 icmptype == ICMP_PARAMPROB) 4905 state_icmp++; 4906 break; 4907#endif /* INET */ 4908#ifdef INET6 4909 case IPPROTO_ICMPV6: 4910 icmptype = pd->hdr.icmp6->icmp6_type; 4911 icmpid = pd->hdr.icmp6->icmp6_id; 4912 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4913 4914 if (icmptype == ICMP6_DST_UNREACH || 4915 icmptype == ICMP6_PACKET_TOO_BIG || 4916 icmptype == ICMP6_TIME_EXCEEDED || 4917 icmptype == ICMP6_PARAM_PROB) 4918 state_icmp++; 4919 break; 4920#endif /* INET6 */ 4921 } 4922 4923 if (!state_icmp) { 4924 4925 /* 4926 * ICMP query/reply message not related to a TCP/UDP packet. 4927 * Search for an ICMP state. 4928 */ 4929 key.af = pd->af; 4930 key.proto = pd->proto; 4931 key.port[0] = key.port[1] = icmpid; 4932 if (direction == PF_IN) { /* wire side, straight */ 4933 PF_ACPY(&key.addr[0], pd->src, key.af); 4934 PF_ACPY(&key.addr[1], pd->dst, key.af); 4935 } else { /* stack side, reverse */ 4936 PF_ACPY(&key.addr[1], pd->src, key.af); 4937 PF_ACPY(&key.addr[0], pd->dst, key.af); 4938 } 4939 4940#ifdef __FreeBSD__ 4941 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 4942#else 4943 STATE_LOOKUP(kif, &key, direction, *state, m); 4944#endif 4945 4946 (*state)->expire = time_second; 4947 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4948 4949 /* translate source/destination address, if necessary */ 4950 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4951 struct pf_state_key *nk = (*state)->key[pd->didx]; 4952 4953 switch (pd->af) { 4954#ifdef INET 4955 case AF_INET: 4956 if (PF_ANEQ(pd->src, 4957 &nk->addr[pd->sidx], AF_INET)) 4958 pf_change_a(&saddr->v4.s_addr, 4959 pd->ip_sum, 4960 nk->addr[pd->sidx].v4.s_addr, 0); 4961 4962 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4963 AF_INET)) 4964 pf_change_a(&daddr->v4.s_addr, 4965 pd->ip_sum, 4966 nk->addr[pd->didx].v4.s_addr, 0); 4967 4968 if (nk->port[0] != 4969 pd->hdr.icmp->icmp_id) { 4970 pd->hdr.icmp->icmp_cksum = 4971 pf_cksum_fixup( 4972 pd->hdr.icmp->icmp_cksum, icmpid, 4973 nk->port[pd->sidx], 0); 4974 pd->hdr.icmp->icmp_id = 4975 nk->port[pd->sidx]; 4976 } 4977 4978 m_copyback(m, off, ICMP_MINLEN, 4979#ifdef __FreeBSD__ 4980 (caddr_t) 4981#endif 4982 pd->hdr.icmp); 4983 break; 4984#endif /* INET */ 4985#ifdef INET6 4986 case AF_INET6: 4987 if (PF_ANEQ(pd->src, 4988 &nk->addr[pd->sidx], AF_INET6)) 4989 pf_change_a6(saddr, 4990 &pd->hdr.icmp6->icmp6_cksum, 4991 &nk->addr[pd->sidx], 0); 4992 4993 if (PF_ANEQ(pd->dst, 4994 &nk->addr[pd->didx], AF_INET6)) 4995 pf_change_a6(daddr, 4996 &pd->hdr.icmp6->icmp6_cksum, 4997 &nk->addr[pd->didx], 0); 4998 4999 m_copyback(m, off, 5000 sizeof(struct icmp6_hdr), 5001#ifdef __FreeBSD__ 5002 (caddr_t) 5003#endif 5004 pd->hdr.icmp6); 5005 break; 5006#endif /* INET6 */ 5007 } 5008 } 5009 return (PF_PASS); 5010 5011 } else { 5012 /* 5013 * ICMP error message in response to a TCP/UDP packet. 5014 * Extract the inner TCP/UDP header and search for that state. 5015 */ 5016 5017 struct pf_pdesc pd2; 5018#ifdef __FreeBSD__ 5019 bzero(&pd2, sizeof pd2); 5020#endif 5021#ifdef INET 5022 struct ip h2; 5023#endif /* INET */ 5024#ifdef INET6 5025 struct ip6_hdr h2_6; 5026 int terminal = 0; 5027#endif /* INET6 */ 5028#ifdef __FreeBSD__ 5029 int ipoff2 = 0; 5030 int off2 = 0; 5031#else 5032 int ipoff2; 5033 int off2; 5034#endif 5035 5036 pd2.af = pd->af; 5037 /* Payload packet is from the opposite direction. */ 5038 pd2.sidx = (direction == PF_IN) ? 1 : 0; 5039 pd2.didx = (direction == PF_IN) ? 0 : 1; 5040 switch (pd->af) { 5041#ifdef INET 5042 case AF_INET: 5043 /* offset of h2 in mbuf chain */ 5044 ipoff2 = off + ICMP_MINLEN; 5045 5046 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5047 NULL, reason, pd2.af)) { 5048 DPFPRINTF(PF_DEBUG_MISC, 5049 ("pf: ICMP error message too short " 5050 "(ip)\n")); 5051 return (PF_DROP); 5052 } 5053 /* 5054 * ICMP error messages don't refer to non-first 5055 * fragments 5056 */ 5057 if (h2.ip_off & htons(IP_OFFMASK)) { 5058 REASON_SET(reason, PFRES_FRAG); 5059 return (PF_DROP); 5060 } 5061 5062 /* offset of protocol header that follows h2 */ 5063 off2 = ipoff2 + (h2.ip_hl << 2); 5064 5065 pd2.proto = h2.ip_p; 5066 pd2.src = (struct pf_addr *)&h2.ip_src; 5067 pd2.dst = (struct pf_addr *)&h2.ip_dst; 5068 pd2.ip_sum = &h2.ip_sum; 5069 break; 5070#endif /* INET */ 5071#ifdef INET6 5072 case AF_INET6: 5073 ipoff2 = off + sizeof(struct icmp6_hdr); 5074 5075 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5076 NULL, reason, pd2.af)) { 5077 DPFPRINTF(PF_DEBUG_MISC, 5078 ("pf: ICMP error message too short " 5079 "(ip6)\n")); 5080 return (PF_DROP); 5081 } 5082 pd2.proto = h2_6.ip6_nxt; 5083 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5084 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5085 pd2.ip_sum = NULL; 5086 off2 = ipoff2 + sizeof(h2_6); 5087 do { 5088 switch (pd2.proto) { 5089 case IPPROTO_FRAGMENT: 5090 /* 5091 * ICMPv6 error messages for 5092 * non-first fragments 5093 */ 5094 REASON_SET(reason, PFRES_FRAG); 5095 return (PF_DROP); 5096 case IPPROTO_AH: 5097 case IPPROTO_HOPOPTS: 5098 case IPPROTO_ROUTING: 5099 case IPPROTO_DSTOPTS: { 5100 /* get next header and header length */ 5101 struct ip6_ext opt6; 5102 5103 if (!pf_pull_hdr(m, off2, &opt6, 5104 sizeof(opt6), NULL, reason, 5105 pd2.af)) { 5106 DPFPRINTF(PF_DEBUG_MISC, 5107 ("pf: ICMPv6 short opt\n")); 5108 return (PF_DROP); 5109 } 5110 if (pd2.proto == IPPROTO_AH) 5111 off2 += (opt6.ip6e_len + 2) * 4; 5112 else 5113 off2 += (opt6.ip6e_len + 1) * 8; 5114 pd2.proto = opt6.ip6e_nxt; 5115 /* goto the next header */ 5116 break; 5117 } 5118 default: 5119 terminal++; 5120 break; 5121 } 5122 } while (!terminal); 5123 break; 5124#endif /* INET6 */ 5125 } 5126 5127 switch (pd2.proto) { 5128 case IPPROTO_TCP: { 5129 struct tcphdr th; 5130 u_int32_t seq; 5131 struct pf_state_peer *src, *dst; 5132 u_int8_t dws; 5133 int copyback = 0; 5134 5135 /* 5136 * Only the first 8 bytes of the TCP header can be 5137 * expected. Don't access any TCP header fields after 5138 * th_seq, an ackskew test is not possible. 5139 */ 5140 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5141 pd2.af)) { 5142 DPFPRINTF(PF_DEBUG_MISC, 5143 ("pf: ICMP error message too short " 5144 "(tcp)\n")); 5145 return (PF_DROP); 5146 } 5147 5148 key.af = pd2.af; 5149 key.proto = IPPROTO_TCP; 5150 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5151 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5152 key.port[pd2.sidx] = th.th_sport; 5153 key.port[pd2.didx] = th.th_dport; 5154 5155#ifdef __FreeBSD__ 5156 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5157#else 5158 STATE_LOOKUP(kif, &key, direction, *state, m); 5159#endif 5160 5161 if (direction == (*state)->direction) { 5162 src = &(*state)->dst; 5163 dst = &(*state)->src; 5164 } else { 5165 src = &(*state)->src; 5166 dst = &(*state)->dst; 5167 } 5168 5169 if (src->wscale && dst->wscale) 5170 dws = dst->wscale & PF_WSCALE_MASK; 5171 else 5172 dws = 0; 5173 5174 /* Demodulate sequence number */ 5175 seq = ntohl(th.th_seq) - src->seqdiff; 5176 if (src->seqdiff) { 5177 pf_change_a(&th.th_seq, icmpsum, 5178 htonl(seq), 0); 5179 copyback = 1; 5180 } 5181 5182 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 5183 (!SEQ_GEQ(src->seqhi, seq) || 5184 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 5185#ifdef __FreeBSD__ 5186 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5187#else 5188 if (pf_status.debug >= PF_DEBUG_MISC) { 5189#endif 5190 printf("pf: BAD ICMP %d:%d ", 5191 icmptype, pd->hdr.icmp->icmp_code); 5192 pf_print_host(pd->src, 0, pd->af); 5193 printf(" -> "); 5194 pf_print_host(pd->dst, 0, pd->af); 5195 printf(" state: "); 5196 pf_print_state(*state); 5197 printf(" seq=%u\n", seq); 5198 } 5199 REASON_SET(reason, PFRES_BADSTATE); 5200 return (PF_DROP); 5201 } else { 5202#ifdef __FreeBSD__ 5203 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5204#else 5205 if (pf_status.debug >= PF_DEBUG_MISC) { 5206#endif 5207 printf("pf: OK ICMP %d:%d ", 5208 icmptype, pd->hdr.icmp->icmp_code); 5209 pf_print_host(pd->src, 0, pd->af); 5210 printf(" -> "); 5211 pf_print_host(pd->dst, 0, pd->af); 5212 printf(" state: "); 5213 pf_print_state(*state); 5214 printf(" seq=%u\n", seq); 5215 } 5216 } 5217 5218 /* translate source/destination address, if necessary */ 5219 if ((*state)->key[PF_SK_WIRE] != 5220 (*state)->key[PF_SK_STACK]) { 5221 struct pf_state_key *nk = 5222 (*state)->key[pd->didx]; 5223 5224 if (PF_ANEQ(pd2.src, 5225 &nk->addr[pd2.sidx], pd2.af) || 5226 nk->port[pd2.sidx] != th.th_sport) 5227 pf_change_icmp(pd2.src, &th.th_sport, 5228 daddr, &nk->addr[pd2.sidx], 5229 nk->port[pd2.sidx], NULL, 5230 pd2.ip_sum, icmpsum, 5231 pd->ip_sum, 0, pd2.af); 5232 5233 if (PF_ANEQ(pd2.dst, 5234 &nk->addr[pd2.didx], pd2.af) || 5235 nk->port[pd2.didx] != th.th_dport) 5236 pf_change_icmp(pd2.dst, &th.th_dport, 5237 NULL, /* XXX Inbound NAT? */ 5238 &nk->addr[pd2.didx], 5239 nk->port[pd2.didx], NULL, 5240 pd2.ip_sum, icmpsum, 5241 pd->ip_sum, 0, pd2.af); 5242 copyback = 1; 5243 } 5244 5245 if (copyback) { 5246 switch (pd2.af) { 5247#ifdef INET 5248 case AF_INET: 5249 m_copyback(m, off, ICMP_MINLEN, 5250#ifdef __FreeBSD__ 5251 (caddr_t) 5252#endif 5253 pd->hdr.icmp); 5254 m_copyback(m, ipoff2, sizeof(h2), 5255#ifdef __FreeBSD__ 5256 (caddr_t) 5257#endif 5258 &h2); 5259 break; 5260#endif /* INET */ 5261#ifdef INET6 5262 case AF_INET6: 5263 m_copyback(m, off, 5264 sizeof(struct icmp6_hdr), 5265#ifdef __FreeBSD__ 5266 (caddr_t) 5267#endif 5268 pd->hdr.icmp6); 5269 m_copyback(m, ipoff2, sizeof(h2_6), 5270#ifdef __FreeBSD__ 5271 (caddr_t) 5272#endif 5273 &h2_6); 5274 break; 5275#endif /* INET6 */ 5276 } 5277#ifdef __FreeBSD__ 5278 m_copyback(m, off2, 8, (caddr_t)&th); 5279#else 5280 m_copyback(m, off2, 8, &th); 5281#endif 5282 } 5283 5284 return (PF_PASS); 5285 break; 5286 } 5287 case IPPROTO_UDP: { 5288 struct udphdr uh; 5289 5290 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5291 NULL, reason, pd2.af)) { 5292 DPFPRINTF(PF_DEBUG_MISC, 5293 ("pf: ICMP error message too short " 5294 "(udp)\n")); 5295 return (PF_DROP); 5296 } 5297 5298 key.af = pd2.af; 5299 key.proto = IPPROTO_UDP; 5300 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5301 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5302 key.port[pd2.sidx] = uh.uh_sport; 5303 key.port[pd2.didx] = uh.uh_dport; 5304 5305#ifdef __FreeBSD__ 5306 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5307#else 5308 STATE_LOOKUP(kif, &key, direction, *state, m); 5309#endif 5310 5311 /* translate source/destination address, if necessary */ 5312 if ((*state)->key[PF_SK_WIRE] != 5313 (*state)->key[PF_SK_STACK]) { 5314 struct pf_state_key *nk = 5315 (*state)->key[pd->didx]; 5316 5317 if (PF_ANEQ(pd2.src, 5318 &nk->addr[pd2.sidx], pd2.af) || 5319 nk->port[pd2.sidx] != uh.uh_sport) 5320 pf_change_icmp(pd2.src, &uh.uh_sport, 5321 daddr, &nk->addr[pd2.sidx], 5322 nk->port[pd2.sidx], &uh.uh_sum, 5323 pd2.ip_sum, icmpsum, 5324 pd->ip_sum, 1, pd2.af); 5325 5326 if (PF_ANEQ(pd2.dst, 5327 &nk->addr[pd2.didx], pd2.af) || 5328 nk->port[pd2.didx] != uh.uh_dport) 5329 pf_change_icmp(pd2.dst, &uh.uh_dport, 5330 NULL, /* XXX Inbound NAT? */ 5331 &nk->addr[pd2.didx], 5332 nk->port[pd2.didx], &uh.uh_sum, 5333 pd2.ip_sum, icmpsum, 5334 pd->ip_sum, 1, pd2.af); 5335 5336 switch (pd2.af) { 5337#ifdef INET 5338 case AF_INET: 5339 m_copyback(m, off, ICMP_MINLEN, 5340#ifdef __FreeBSD__ 5341 (caddr_t) 5342#endif 5343 pd->hdr.icmp); 5344#ifdef __FreeBSD__ 5345 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5346#else 5347 m_copyback(m, ipoff2, sizeof(h2), &h2); 5348#endif 5349 break; 5350#endif /* INET */ 5351#ifdef INET6 5352 case AF_INET6: 5353 m_copyback(m, off, 5354 sizeof(struct icmp6_hdr), 5355#ifdef __FreeBSD__ 5356 (caddr_t) 5357#endif 5358 pd->hdr.icmp6); 5359 m_copyback(m, ipoff2, sizeof(h2_6), 5360#ifdef __FreeBSD__ 5361 (caddr_t) 5362#endif 5363 &h2_6); 5364 break; 5365#endif /* INET6 */ 5366 } 5367#ifdef __FreeBSD__ 5368 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 5369#else 5370 m_copyback(m, off2, sizeof(uh), &uh); 5371#endif 5372 } 5373 return (PF_PASS); 5374 break; 5375 } 5376#ifdef INET 5377 case IPPROTO_ICMP: { 5378 struct icmp iih; 5379 5380 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5381 NULL, reason, pd2.af)) { 5382 DPFPRINTF(PF_DEBUG_MISC, 5383 ("pf: ICMP error message too short i" 5384 "(icmp)\n")); 5385 return (PF_DROP); 5386 } 5387 5388 key.af = pd2.af; 5389 key.proto = IPPROTO_ICMP; 5390 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5391 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5392 key.port[0] = key.port[1] = iih.icmp_id; 5393 5394#ifdef __FreeBSD__ 5395 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5396#else 5397 STATE_LOOKUP(kif, &key, direction, *state, m); 5398#endif 5399 5400 /* translate source/destination address, if necessary */ 5401 if ((*state)->key[PF_SK_WIRE] != 5402 (*state)->key[PF_SK_STACK]) { 5403 struct pf_state_key *nk = 5404 (*state)->key[pd->didx]; 5405 5406 if (PF_ANEQ(pd2.src, 5407 &nk->addr[pd2.sidx], pd2.af) || 5408 nk->port[pd2.sidx] != iih.icmp_id) 5409 pf_change_icmp(pd2.src, &iih.icmp_id, 5410 daddr, &nk->addr[pd2.sidx], 5411 nk->port[pd2.sidx], NULL, 5412 pd2.ip_sum, icmpsum, 5413 pd->ip_sum, 0, AF_INET); 5414 5415 if (PF_ANEQ(pd2.dst, 5416 &nk->addr[pd2.didx], pd2.af) || 5417 nk->port[pd2.didx] != iih.icmp_id) 5418 pf_change_icmp(pd2.dst, &iih.icmp_id, 5419 NULL, /* XXX Inbound NAT? */ 5420 &nk->addr[pd2.didx], 5421 nk->port[pd2.didx], NULL, 5422 pd2.ip_sum, icmpsum, 5423 pd->ip_sum, 0, AF_INET); 5424 5425#ifdef __FreeBSD__ 5426 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 5427 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5428 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 5429#else 5430 m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp); 5431 m_copyback(m, ipoff2, sizeof(h2), &h2); 5432 m_copyback(m, off2, ICMP_MINLEN, &iih); 5433#endif 5434 } 5435 return (PF_PASS); 5436 break; 5437 } 5438#endif /* INET */ 5439#ifdef INET6 5440 case IPPROTO_ICMPV6: { 5441 struct icmp6_hdr iih; 5442 5443 if (!pf_pull_hdr(m, off2, &iih, 5444 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5445 DPFPRINTF(PF_DEBUG_MISC, 5446 ("pf: ICMP error message too short " 5447 "(icmp6)\n")); 5448 return (PF_DROP); 5449 } 5450 5451 key.af = pd2.af; 5452 key.proto = IPPROTO_ICMPV6; 5453 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5454 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5455 key.port[0] = key.port[1] = iih.icmp6_id; 5456 5457#ifdef __FreeBSD__ 5458 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5459#else 5460 STATE_LOOKUP(kif, &key, direction, *state, m); 5461#endif 5462 5463 /* translate source/destination address, if necessary */ 5464 if ((*state)->key[PF_SK_WIRE] != 5465 (*state)->key[PF_SK_STACK]) { 5466 struct pf_state_key *nk = 5467 (*state)->key[pd->didx]; 5468 5469 if (PF_ANEQ(pd2.src, 5470 &nk->addr[pd2.sidx], pd2.af) || 5471 nk->port[pd2.sidx] != iih.icmp6_id) 5472 pf_change_icmp(pd2.src, &iih.icmp6_id, 5473 daddr, &nk->addr[pd2.sidx], 5474 nk->port[pd2.sidx], NULL, 5475 pd2.ip_sum, icmpsum, 5476 pd->ip_sum, 0, AF_INET6); 5477 5478 if (PF_ANEQ(pd2.dst, 5479 &nk->addr[pd2.didx], pd2.af) || 5480 nk->port[pd2.didx] != iih.icmp6_id) 5481 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5482 NULL, /* XXX Inbound NAT? */ 5483 &nk->addr[pd2.didx], 5484 nk->port[pd2.didx], NULL, 5485 pd2.ip_sum, icmpsum, 5486 pd->ip_sum, 0, AF_INET6); 5487 5488#ifdef __FreeBSD__ 5489 m_copyback(m, off, sizeof(struct icmp6_hdr), 5490 (caddr_t)pd->hdr.icmp6); 5491 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5492 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5493 (caddr_t)&iih); 5494#else 5495 m_copyback(m, off, sizeof(struct icmp6_hdr), 5496 pd->hdr.icmp6); 5497 m_copyback(m, ipoff2, sizeof(h2_6), &h2_6); 5498 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5499 &iih); 5500#endif 5501 } 5502 return (PF_PASS); 5503 break; 5504 } 5505#endif /* INET6 */ 5506 default: { 5507 key.af = pd2.af; 5508 key.proto = pd2.proto; 5509 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5510 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5511 key.port[0] = key.port[1] = 0; 5512 5513#ifdef __FreeBSD__ 5514 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5515#else 5516 STATE_LOOKUP(kif, &key, direction, *state, m); 5517#endif 5518 5519 /* translate source/destination address, if necessary */ 5520 if ((*state)->key[PF_SK_WIRE] != 5521 (*state)->key[PF_SK_STACK]) { 5522 struct pf_state_key *nk = 5523 (*state)->key[pd->didx]; 5524 5525 if (PF_ANEQ(pd2.src, 5526 &nk->addr[pd2.sidx], pd2.af)) 5527 pf_change_icmp(pd2.src, NULL, daddr, 5528 &nk->addr[pd2.sidx], 0, NULL, 5529 pd2.ip_sum, icmpsum, 5530 pd->ip_sum, 0, pd2.af); 5531 5532 if (PF_ANEQ(pd2.dst, 5533 &nk->addr[pd2.didx], pd2.af)) 5534 pf_change_icmp(pd2.src, NULL, 5535 NULL, /* XXX Inbound NAT? */ 5536 &nk->addr[pd2.didx], 0, NULL, 5537 pd2.ip_sum, icmpsum, 5538 pd->ip_sum, 0, pd2.af); 5539 5540 switch (pd2.af) { 5541#ifdef INET 5542 case AF_INET: 5543#ifdef __FreeBSD__ 5544 m_copyback(m, off, ICMP_MINLEN, 5545 (caddr_t)pd->hdr.icmp); 5546 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5547#else 5548 m_copyback(m, off, ICMP_MINLEN, 5549 pd->hdr.icmp); 5550 m_copyback(m, ipoff2, sizeof(h2), &h2); 5551#endif 5552 break; 5553#endif /* INET */ 5554#ifdef INET6 5555 case AF_INET6: 5556 m_copyback(m, off, 5557 sizeof(struct icmp6_hdr), 5558#ifdef __FreeBSD__ 5559 (caddr_t) 5560#endif 5561 pd->hdr.icmp6); 5562 m_copyback(m, ipoff2, sizeof(h2_6), 5563#ifdef __FreeBSD__ 5564 (caddr_t) 5565#endif 5566 &h2_6); 5567 break; 5568#endif /* INET6 */ 5569 } 5570 } 5571 return (PF_PASS); 5572 break; 5573 } 5574 } 5575 } 5576} 5577 5578int 5579pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5580 struct mbuf *m, struct pf_pdesc *pd) 5581{ 5582 struct pf_state_peer *src, *dst; 5583 struct pf_state_key_cmp key; 5584 5585 key.af = pd->af; 5586 key.proto = pd->proto; 5587 if (direction == PF_IN) { 5588 PF_ACPY(&key.addr[0], pd->src, key.af); 5589 PF_ACPY(&key.addr[1], pd->dst, key.af); 5590 key.port[0] = key.port[1] = 0; 5591 } else { 5592 PF_ACPY(&key.addr[1], pd->src, key.af); 5593 PF_ACPY(&key.addr[0], pd->dst, key.af); 5594 key.port[1] = key.port[0] = 0; 5595 } 5596 5597#ifdef __FreeBSD__ 5598 STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); 5599#else 5600 STATE_LOOKUP(kif, &key, direction, *state, m); 5601#endif 5602 5603 if (direction == (*state)->direction) { 5604 src = &(*state)->src; 5605 dst = &(*state)->dst; 5606 } else { 5607 src = &(*state)->dst; 5608 dst = &(*state)->src; 5609 } 5610 5611 /* update states */ 5612 if (src->state < PFOTHERS_SINGLE) 5613 src->state = PFOTHERS_SINGLE; 5614 if (dst->state == PFOTHERS_SINGLE) 5615 dst->state = PFOTHERS_MULTIPLE; 5616 5617 /* update expire time */ 5618 (*state)->expire = time_second; 5619 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5620 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5621 else 5622 (*state)->timeout = PFTM_OTHER_SINGLE; 5623 5624 /* translate source/destination address, if necessary */ 5625 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5626 struct pf_state_key *nk = (*state)->key[pd->didx]; 5627 5628#ifdef __FreeBSD__ 5629 KASSERT(nk, ("%s: nk is null", __FUNCTION__)); 5630 KASSERT(pd, ("%s: pd is null", __FUNCTION__)); 5631 KASSERT(pd->src, ("%s: pd->src is null", __FUNCTION__)); 5632 KASSERT(pd->dst, ("%s: pd->dst is null", __FUNCTION__)); 5633#else 5634 KASSERT(nk); 5635 KASSERT(pd); 5636 KASSERT(pd->src); 5637 KASSERT(pd->dst); 5638#endif 5639 switch (pd->af) { 5640#ifdef INET 5641 case AF_INET: 5642 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5643 pf_change_a(&pd->src->v4.s_addr, 5644 pd->ip_sum, 5645 nk->addr[pd->sidx].v4.s_addr, 5646 0); 5647 5648 5649 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5650 pf_change_a(&pd->dst->v4.s_addr, 5651 pd->ip_sum, 5652 nk->addr[pd->didx].v4.s_addr, 5653 0); 5654 5655 break; 5656#endif /* INET */ 5657#ifdef INET6 5658 case AF_INET6: 5659 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5660 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5661 5662 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5663 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5664#endif /* INET6 */ 5665 } 5666 } 5667 return (PF_PASS); 5668} 5669 5670/* 5671 * ipoff and off are measured from the start of the mbuf chain. 5672 * h must be at "ipoff" on the mbuf chain. 5673 */ 5674void * 5675pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5676 u_short *actionp, u_short *reasonp, sa_family_t af) 5677{ 5678 switch (af) { 5679#ifdef INET 5680 case AF_INET: { 5681 struct ip *h = mtod(m, struct ip *); 5682 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5683 5684 if (fragoff) { 5685 if (fragoff >= len) 5686 ACTION_SET(actionp, PF_PASS); 5687 else { 5688 ACTION_SET(actionp, PF_DROP); 5689 REASON_SET(reasonp, PFRES_FRAG); 5690 } 5691 return (NULL); 5692 } 5693 if (m->m_pkthdr.len < off + len || 5694 ntohs(h->ip_len) < off + len) { 5695 ACTION_SET(actionp, PF_DROP); 5696 REASON_SET(reasonp, PFRES_SHORT); 5697 return (NULL); 5698 } 5699 break; 5700 } 5701#endif /* INET */ 5702#ifdef INET6 5703 case AF_INET6: { 5704 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5705 5706 if (m->m_pkthdr.len < off + len || 5707 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5708 (unsigned)(off + len)) { 5709 ACTION_SET(actionp, PF_DROP); 5710 REASON_SET(reasonp, PFRES_SHORT); 5711 return (NULL); 5712 } 5713 break; 5714 } 5715#endif /* INET6 */ 5716 } 5717 m_copydata(m, off, len, p); 5718 return (p); 5719} 5720 5721int 5722pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5723 int rtableid) 5724{ 5725#ifdef __FreeBSD__ 5726#ifdef RADIX_MPATH 5727 struct radix_node_head *rnh; 5728#endif 5729#endif 5730 struct sockaddr_in *dst; 5731 int ret = 1; 5732 int check_mpath; 5733#ifndef __FreeBSD__ 5734 extern int ipmultipath; 5735#endif 5736#ifdef INET6 5737#ifndef __FreeBSD__ 5738 extern int ip6_multipath; 5739#endif 5740 struct sockaddr_in6 *dst6; 5741 struct route_in6 ro; 5742#else 5743 struct route ro; 5744#endif 5745 struct radix_node *rn; 5746 struct rtentry *rt; 5747 struct ifnet *ifp; 5748 5749 check_mpath = 0; 5750#ifdef __FreeBSD__ 5751#ifdef RADIX_MPATH 5752 /* XXX: stick to table 0 for now */ 5753 rnh = rt_tables_get_rnh(0, af); 5754 if (rnh != NULL && rn_mpath_capable(rnh)) 5755 check_mpath = 1; 5756#endif 5757#endif 5758 bzero(&ro, sizeof(ro)); 5759 switch (af) { 5760 case AF_INET: 5761 dst = satosin(&ro.ro_dst); 5762 dst->sin_family = AF_INET; 5763 dst->sin_len = sizeof(*dst); 5764 dst->sin_addr = addr->v4; 5765#ifndef __FreeBSD__ 5766 if (ipmultipath) 5767 check_mpath = 1; 5768#endif 5769 break; 5770#ifdef INET6 5771 case AF_INET6: 5772 /* 5773 * Skip check for addresses with embedded interface scope, 5774 * as they would always match anyway. 5775 */ 5776 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5777 goto out; 5778 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5779 dst6->sin6_family = AF_INET6; 5780 dst6->sin6_len = sizeof(*dst6); 5781 dst6->sin6_addr = addr->v6; 5782#ifndef __FreeBSD__ 5783 if (ip6_multipath) 5784 check_mpath = 1; 5785#endif 5786 break; 5787#endif /* INET6 */ 5788 default: 5789 return (0); 5790 } 5791 5792 /* Skip checks for ipsec interfaces */ 5793 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5794 goto out; 5795 5796#ifdef __FreeBSD__ 5797 switch (af) { 5798#ifdef INET6 5799 case AF_INET6: 5800 in6_rtalloc_ign(&ro, 0, rtableid); 5801 break; 5802#endif 5803#ifdef INET 5804 case AF_INET: 5805 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5806 break; 5807#endif 5808 default: 5809 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5810 break; 5811 } 5812#else /* ! __FreeBSD__ */ 5813 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5814#endif 5815 5816 if (ro.ro_rt != NULL) { 5817 /* No interface given, this is a no-route check */ 5818 if (kif == NULL) 5819 goto out; 5820 5821 if (kif->pfik_ifp == NULL) { 5822 ret = 0; 5823 goto out; 5824 } 5825 5826 /* Perform uRPF check if passed input interface */ 5827 ret = 0; 5828 rn = (struct radix_node *)ro.ro_rt; 5829 do { 5830 rt = (struct rtentry *)rn; 5831#ifndef __FreeBSD__ /* CARPDEV */ 5832 if (rt->rt_ifp->if_type == IFT_CARP) 5833 ifp = rt->rt_ifp->if_carpdev; 5834 else 5835#endif 5836 ifp = rt->rt_ifp; 5837 5838 if (kif->pfik_ifp == ifp) 5839 ret = 1; 5840#ifdef __FreeBSD__ 5841#ifdef RADIX_MPATH 5842 rn = rn_mpath_next(rn); 5843#endif 5844#else 5845 rn = rn_mpath_next(rn, 0); 5846#endif 5847 } while (check_mpath == 1 && rn != NULL && ret == 0); 5848 } else 5849 ret = 0; 5850out: 5851 if (ro.ro_rt != NULL) 5852 RTFREE(ro.ro_rt); 5853 return (ret); 5854} 5855 5856int 5857pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw, 5858 int rtableid) 5859{ 5860 struct sockaddr_in *dst; 5861#ifdef INET6 5862 struct sockaddr_in6 *dst6; 5863 struct route_in6 ro; 5864#else 5865 struct route ro; 5866#endif 5867 int ret = 0; 5868 5869 bzero(&ro, sizeof(ro)); 5870 switch (af) { 5871 case AF_INET: 5872 dst = satosin(&ro.ro_dst); 5873 dst->sin_family = AF_INET; 5874 dst->sin_len = sizeof(*dst); 5875 dst->sin_addr = addr->v4; 5876 break; 5877#ifdef INET6 5878 case AF_INET6: 5879 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5880 dst6->sin6_family = AF_INET6; 5881 dst6->sin6_len = sizeof(*dst6); 5882 dst6->sin6_addr = addr->v6; 5883 break; 5884#endif /* INET6 */ 5885 default: 5886 return (0); 5887 } 5888 5889#ifdef __FreeBSD__ 5890 switch (af) { 5891#ifdef INET6 5892 case AF_INET6: 5893 in6_rtalloc_ign(&ro, 0, rtableid); 5894 break; 5895#endif 5896#ifdef INET 5897 case AF_INET: 5898 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5899 break; 5900#endif 5901 default: 5902 rtalloc_ign((struct route *)&ro, 0); 5903 break; 5904 } 5905#else /* ! __FreeBSD__ */ 5906 rtalloc_noclone((struct route *)&ro, NO_CLONING); 5907#endif 5908 5909 if (ro.ro_rt != NULL) { 5910#ifdef __FreeBSD__ 5911 /* XXX_IMPORT: later */ 5912#else 5913 if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 5914 ret = 1; 5915#endif 5916 RTFREE(ro.ro_rt); 5917 } 5918 5919 return (ret); 5920} 5921 5922#ifdef INET 5923void 5924pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5925 struct pf_state *s, struct pf_pdesc *pd) 5926{ 5927 struct mbuf *m0, *m1; 5928 struct route iproute; 5929 struct route *ro = NULL; 5930 struct sockaddr_in *dst; 5931 struct ip *ip; 5932 struct ifnet *ifp = NULL; 5933 struct pf_addr naddr; 5934 struct pf_src_node *sn = NULL; 5935 int error = 0; 5936#ifdef __FreeBSD__ 5937 int sw_csum; 5938#endif 5939#ifdef IPSEC 5940 struct m_tag *mtag; 5941#endif /* IPSEC */ 5942 5943 if (m == NULL || *m == NULL || r == NULL || 5944 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 5945 panic("pf_route: invalid parameters"); 5946 5947#ifdef __FreeBSD__ 5948 if (pd->pf_mtag->routed++ > 3) { 5949#else 5950 if ((*m)->m_pkthdr.pf.routed++ > 3) { 5951#endif 5952 m0 = *m; 5953 *m = NULL; 5954 goto bad; 5955 } 5956 5957 if (r->rt == PF_DUPTO) { 5958#ifdef __FreeBSD__ 5959 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 5960#else 5961 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 5962#endif 5963 return; 5964 } else { 5965 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 5966 return; 5967 m0 = *m; 5968 } 5969 5970 if (m0->m_len < sizeof(struct ip)) { 5971 DPFPRINTF(PF_DEBUG_URGENT, 5972 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 5973 goto bad; 5974 } 5975 5976 ip = mtod(m0, struct ip *); 5977 5978 ro = &iproute; 5979 bzero((caddr_t)ro, sizeof(*ro)); 5980 dst = satosin(&ro->ro_dst); 5981 dst->sin_family = AF_INET; 5982 dst->sin_len = sizeof(*dst); 5983 dst->sin_addr = ip->ip_dst; 5984 5985 if (r->rt == PF_FASTROUTE) { 5986#ifdef __FreeBSD__ 5987 in_rtalloc_ign(ro, 0, M_GETFIB(m0)); 5988#else 5989 rtalloc(ro); 5990#endif 5991 if (ro->ro_rt == 0) { 5992#ifdef __FreeBSD__ 5993 KMOD_IPSTAT_INC(ips_noroute); 5994#else 5995 ipstat.ips_noroute++; 5996#endif 5997 goto bad; 5998 } 5999 6000 ifp = ro->ro_rt->rt_ifp; 6001 ro->ro_rt->rt_use++; 6002 6003 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 6004 dst = satosin(ro->ro_rt->rt_gateway); 6005 } else { 6006 if (TAILQ_EMPTY(&r->rpool.list)) { 6007 DPFPRINTF(PF_DEBUG_URGENT, 6008 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 6009 goto bad; 6010 } 6011 if (s == NULL) { 6012 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 6013 &naddr, NULL, &sn); 6014 if (!PF_AZERO(&naddr, AF_INET)) 6015 dst->sin_addr.s_addr = naddr.v4.s_addr; 6016 ifp = r->rpool.cur->kif ? 6017 r->rpool.cur->kif->pfik_ifp : NULL; 6018 } else { 6019 if (!PF_AZERO(&s->rt_addr, AF_INET)) 6020 dst->sin_addr.s_addr = 6021 s->rt_addr.v4.s_addr; 6022 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6023 } 6024 } 6025 if (ifp == NULL) 6026 goto bad; 6027 6028 if (oifp != ifp) { 6029#ifdef __FreeBSD__ 6030 PF_UNLOCK(); 6031 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6032 PF_LOCK(); 6033 goto bad; 6034 } else if (m0 == NULL) { 6035 PF_LOCK(); 6036 goto done; 6037 } 6038 PF_LOCK(); 6039#else 6040 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6041 goto bad; 6042 else if (m0 == NULL) 6043 goto done; 6044#endif 6045 if (m0->m_len < sizeof(struct ip)) { 6046 DPFPRINTF(PF_DEBUG_URGENT, 6047 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6048 goto bad; 6049 } 6050 ip = mtod(m0, struct ip *); 6051 } 6052 6053#ifdef __FreeBSD__ 6054 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 6055 m0->m_pkthdr.csum_flags |= CSUM_IP; 6056 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 6057 if (sw_csum & CSUM_DELAY_DATA) { 6058 /* 6059 * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 6060 */ 6061 NTOHS(ip->ip_len); 6062 NTOHS(ip->ip_off); /* XXX: needed? */ 6063 in_delayed_cksum(m0); 6064 HTONS(ip->ip_len); 6065 HTONS(ip->ip_off); 6066 sw_csum &= ~CSUM_DELAY_DATA; 6067 } 6068 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 6069 6070 if (ntohs(ip->ip_len) <= ifp->if_mtu || 6071 (ifp->if_hwassist & CSUM_FRAGMENT && 6072 ((ip->ip_off & htons(IP_DF)) == 0))) { 6073 /* 6074 * ip->ip_len = htons(ip->ip_len); 6075 * ip->ip_off = htons(ip->ip_off); 6076 */ 6077 ip->ip_sum = 0; 6078 if (sw_csum & CSUM_DELAY_IP) { 6079 /* From KAME */ 6080 if (ip->ip_v == IPVERSION && 6081 (ip->ip_hl << 2) == sizeof(*ip)) { 6082 ip->ip_sum = in_cksum_hdr(ip); 6083 } else { 6084 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6085 } 6086 } 6087 PF_UNLOCK(); 6088 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro); 6089 PF_LOCK(); 6090 goto done; 6091 } 6092#else 6093 /* Copied from ip_output. */ 6094#ifdef IPSEC 6095 /* 6096 * If deferred crypto processing is needed, check that the 6097 * interface supports it. 6098 */ 6099 if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 6100 != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 6101 /* Notify IPsec to do its own crypto. */ 6102 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 6103 goto bad; 6104 } 6105#endif /* IPSEC */ 6106 6107 /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 6108 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 6109 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 6110 ifp->if_bridge != NULL) { 6111 in_delayed_cksum(m0); 6112 m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clr */ 6113 } 6114 } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 6115 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 6116 ifp->if_bridge != NULL) { 6117 in_delayed_cksum(m0); 6118 m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clr */ 6119 } 6120 } 6121 6122 if (ntohs(ip->ip_len) <= ifp->if_mtu) { 6123 ip->ip_sum = 0; 6124 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 6125 ifp->if_bridge == NULL) { 6126 m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 6127#ifdef __FreeBSD__ 6128 KMOD_IPSTAT_INC(ips_outhwcsum); 6129#else 6130 ipstat.ips_outhwcsum++; 6131#endif 6132 } else 6133 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6134 /* Update relevant hardware checksum stats for TCP/UDP */ 6135 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 6136 KMOD_TCPSTAT_INC(tcps_outhwcsum); 6137 else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 6138 KMOD_UDPSTAT_INC(udps_outhwcsum); 6139 error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 6140 goto done; 6141 } 6142#endif 6143 6144 /* 6145 * Too large for interface; fragment if possible. 6146 * Must be able to put at least 8 bytes per fragment. 6147 */ 6148 if (ip->ip_off & htons(IP_DF)) { 6149#ifdef __FreeBSD__ 6150 KMOD_IPSTAT_INC(ips_cantfrag); 6151#else 6152 ipstat.ips_cantfrag++; 6153#endif 6154 if (r->rt != PF_DUPTO) { 6155#ifdef __FreeBSD__ 6156 /* icmp_error() expects host byte ordering */ 6157 NTOHS(ip->ip_len); 6158 NTOHS(ip->ip_off); 6159 PF_UNLOCK(); 6160 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6161 ifp->if_mtu); 6162 PF_LOCK(); 6163#else 6164 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6165 ifp->if_mtu); 6166#endif 6167 goto done; 6168 } else 6169 goto bad; 6170 } 6171 6172 m1 = m0; 6173#ifdef __FreeBSD__ 6174 /* 6175 * XXX: is cheaper + less error prone than own function 6176 */ 6177 NTOHS(ip->ip_len); 6178 NTOHS(ip->ip_off); 6179 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 6180#else 6181 error = ip_fragment(m0, ifp, ifp->if_mtu); 6182#endif 6183 if (error) { 6184#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 6185 m0 = NULL; 6186#endif 6187 goto bad; 6188 } 6189 6190 for (m0 = m1; m0; m0 = m1) { 6191 m1 = m0->m_nextpkt; 6192 m0->m_nextpkt = 0; 6193#ifdef __FreeBSD__ 6194 if (error == 0) { 6195 PF_UNLOCK(); 6196 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6197 NULL); 6198 PF_LOCK(); 6199 } else 6200#else 6201 if (error == 0) 6202 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6203 NULL); 6204 else 6205#endif 6206 m_freem(m0); 6207 } 6208 6209 if (error == 0) 6210#ifdef __FreeBSD__ 6211 KMOD_IPSTAT_INC(ips_fragmented); 6212#else 6213 ipstat.ips_fragmented++; 6214#endif 6215 6216done: 6217 if (r->rt != PF_DUPTO) 6218 *m = NULL; 6219 if (ro == &iproute && ro->ro_rt) 6220 RTFREE(ro->ro_rt); 6221 return; 6222 6223bad: 6224 m_freem(m0); 6225 goto done; 6226} 6227#endif /* INET */ 6228 6229#ifdef INET6 6230void 6231pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6232 struct pf_state *s, struct pf_pdesc *pd) 6233{ 6234 struct mbuf *m0; 6235 struct route_in6 ip6route; 6236 struct route_in6 *ro; 6237 struct sockaddr_in6 *dst; 6238 struct ip6_hdr *ip6; 6239 struct ifnet *ifp = NULL; 6240 struct pf_addr naddr; 6241 struct pf_src_node *sn = NULL; 6242 6243 if (m == NULL || *m == NULL || r == NULL || 6244 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6245 panic("pf_route6: invalid parameters"); 6246 6247#ifdef __FreeBSD__ 6248 if (pd->pf_mtag->routed++ > 3) { 6249#else 6250 if ((*m)->m_pkthdr.pf.routed++ > 3) { 6251#endif 6252 m0 = *m; 6253 *m = NULL; 6254 goto bad; 6255 } 6256 6257 if (r->rt == PF_DUPTO) { 6258#ifdef __FreeBSD__ 6259 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6260#else 6261 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6262#endif 6263 return; 6264 } else { 6265 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6266 return; 6267 m0 = *m; 6268 } 6269 6270 if (m0->m_len < sizeof(struct ip6_hdr)) { 6271 DPFPRINTF(PF_DEBUG_URGENT, 6272 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6273 goto bad; 6274 } 6275 ip6 = mtod(m0, struct ip6_hdr *); 6276 6277 ro = &ip6route; 6278 bzero((caddr_t)ro, sizeof(*ro)); 6279 dst = (struct sockaddr_in6 *)&ro->ro_dst; 6280 dst->sin6_family = AF_INET6; 6281 dst->sin6_len = sizeof(*dst); 6282 dst->sin6_addr = ip6->ip6_dst; 6283 6284 /* Cheat. XXX why only in the v6 case??? */ 6285 if (r->rt == PF_FASTROUTE) { 6286#ifdef __FreeBSD__ 6287 m0->m_flags |= M_SKIP_FIREWALL; 6288 PF_UNLOCK(); 6289 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6290#else 6291 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED; 6292 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6293#endif 6294 return; 6295 } 6296 6297 if (TAILQ_EMPTY(&r->rpool.list)) { 6298 DPFPRINTF(PF_DEBUG_URGENT, 6299 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6300 goto bad; 6301 } 6302 if (s == NULL) { 6303 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6304 &naddr, NULL, &sn); 6305 if (!PF_AZERO(&naddr, AF_INET6)) 6306 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6307 &naddr, AF_INET6); 6308 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6309 } else { 6310 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6311 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6312 &s->rt_addr, AF_INET6); 6313 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6314 } 6315 if (ifp == NULL) 6316 goto bad; 6317 6318 if (oifp != ifp) { 6319#ifdef __FreeBSD__ 6320 PF_UNLOCK(); 6321 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6322 PF_LOCK(); 6323 goto bad; 6324 } else if (m0 == NULL) { 6325 PF_LOCK(); 6326 goto done; 6327 } 6328 PF_LOCK(); 6329#else 6330 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6331 goto bad; 6332 else if (m0 == NULL) 6333 goto done; 6334#endif 6335 if (m0->m_len < sizeof(struct ip6_hdr)) { 6336 DPFPRINTF(PF_DEBUG_URGENT, 6337 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6338 goto bad; 6339 } 6340 ip6 = mtod(m0, struct ip6_hdr *); 6341 } 6342 6343 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 & 6344 ~ifp->if_hwassist) { 6345 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6); 6346 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr)); 6347 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 6348 } 6349 6350 /* 6351 * If the packet is too large for the outgoing interface, 6352 * send back an icmp6 error. 6353 */ 6354 if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr)) 6355 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6356 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6357#ifdef __FreeBSD__ 6358 PF_UNLOCK(); 6359#endif 6360 nd6_output(ifp, ifp, m0, dst, NULL); 6361#ifdef __FreeBSD__ 6362 PF_LOCK(); 6363#endif 6364 } else { 6365 in6_ifstat_inc(ifp, ifs6_in_toobig); 6366#ifdef __FreeBSD__ 6367 if (r->rt != PF_DUPTO) { 6368 PF_UNLOCK(); 6369 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6370 PF_LOCK(); 6371 } else 6372#else 6373 if (r->rt != PF_DUPTO) 6374 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6375 else 6376#endif 6377 goto bad; 6378 } 6379 6380done: 6381 if (r->rt != PF_DUPTO) 6382 *m = NULL; 6383 return; 6384 6385bad: 6386 m_freem(m0); 6387 goto done; 6388} 6389#endif /* INET6 */ 6390 6391#ifdef __FreeBSD__ 6392/* 6393 * FreeBSD supports cksum offloads for the following drivers. 6394 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6395 * ti(4), txp(4), xl(4) 6396 * 6397 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6398 * network driver performed cksum including pseudo header, need to verify 6399 * csum_data 6400 * CSUM_DATA_VALID : 6401 * network driver performed cksum, needs to additional pseudo header 6402 * cksum computation with partial csum_data(i.e. lack of H/W support for 6403 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6404 * 6405 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6406 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6407 * TCP/UDP layer. 6408 * Also, set csum_data to 0xffff to force cksum validation. 6409 */ 6410int 6411pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6412{ 6413 u_int16_t sum = 0; 6414 int hw_assist = 0; 6415 struct ip *ip; 6416 6417 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6418 return (1); 6419 if (m->m_pkthdr.len < off + len) 6420 return (1); 6421 6422 switch (p) { 6423 case IPPROTO_TCP: 6424 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6425 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6426 sum = m->m_pkthdr.csum_data; 6427 } else { 6428 ip = mtod(m, struct ip *); 6429 sum = in_pseudo(ip->ip_src.s_addr, 6430 ip->ip_dst.s_addr, htonl((u_short)len + 6431 m->m_pkthdr.csum_data + IPPROTO_TCP)); 6432 } 6433 sum ^= 0xffff; 6434 ++hw_assist; 6435 } 6436 break; 6437 case IPPROTO_UDP: 6438 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6439 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6440 sum = m->m_pkthdr.csum_data; 6441 } else { 6442 ip = mtod(m, struct ip *); 6443 sum = in_pseudo(ip->ip_src.s_addr, 6444 ip->ip_dst.s_addr, htonl((u_short)len + 6445 m->m_pkthdr.csum_data + IPPROTO_UDP)); 6446 } 6447 sum ^= 0xffff; 6448 ++hw_assist; 6449 } 6450 break; 6451 case IPPROTO_ICMP: 6452#ifdef INET6 6453 case IPPROTO_ICMPV6: 6454#endif /* INET6 */ 6455 break; 6456 default: 6457 return (1); 6458 } 6459 6460 if (!hw_assist) { 6461 switch (af) { 6462 case AF_INET: 6463 if (p == IPPROTO_ICMP) { 6464 if (m->m_len < off) 6465 return (1); 6466 m->m_data += off; 6467 m->m_len -= off; 6468 sum = in_cksum(m, len); 6469 m->m_data -= off; 6470 m->m_len += off; 6471 } else { 6472 if (m->m_len < sizeof(struct ip)) 6473 return (1); 6474 sum = in4_cksum(m, p, off, len); 6475 } 6476 break; 6477#ifdef INET6 6478 case AF_INET6: 6479 if (m->m_len < sizeof(struct ip6_hdr)) 6480 return (1); 6481 sum = in6_cksum(m, p, off, len); 6482 break; 6483#endif /* INET6 */ 6484 default: 6485 return (1); 6486 } 6487 } 6488 if (sum) { 6489 switch (p) { 6490 case IPPROTO_TCP: 6491 { 6492 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 6493 break; 6494 } 6495 case IPPROTO_UDP: 6496 { 6497 KMOD_UDPSTAT_INC(udps_badsum); 6498 break; 6499 } 6500#ifdef INET 6501 case IPPROTO_ICMP: 6502 { 6503 KMOD_ICMPSTAT_INC(icps_checksum); 6504 break; 6505 } 6506#endif 6507#ifdef INET6 6508 case IPPROTO_ICMPV6: 6509 { 6510 KMOD_ICMP6STAT_INC(icp6s_checksum); 6511 break; 6512 } 6513#endif /* INET6 */ 6514 } 6515 return (1); 6516 } else { 6517 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6518 m->m_pkthdr.csum_flags |= 6519 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6520 m->m_pkthdr.csum_data = 0xffff; 6521 } 6522 } 6523 return (0); 6524} 6525#else /* !__FreeBSD__ */ 6526 6527/* 6528 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6529 * off is the offset where the protocol header starts 6530 * len is the total length of protocol header plus payload 6531 * returns 0 when the checksum is valid, otherwise returns 1. 6532 */ 6533int 6534pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6535 sa_family_t af) 6536{ 6537 u_int16_t flag_ok, flag_bad; 6538 u_int16_t sum; 6539 6540 switch (p) { 6541 case IPPROTO_TCP: 6542 flag_ok = M_TCP_CSUM_IN_OK; 6543 flag_bad = M_TCP_CSUM_IN_BAD; 6544 break; 6545 case IPPROTO_UDP: 6546 flag_ok = M_UDP_CSUM_IN_OK; 6547 flag_bad = M_UDP_CSUM_IN_BAD; 6548 break; 6549 case IPPROTO_ICMP: 6550#ifdef INET6 6551 case IPPROTO_ICMPV6: 6552#endif /* INET6 */ 6553 flag_ok = flag_bad = 0; 6554 break; 6555 default: 6556 return (1); 6557 } 6558 if (m->m_pkthdr.csum_flags & flag_ok) 6559 return (0); 6560 if (m->m_pkthdr.csum_flags & flag_bad) 6561 return (1); 6562 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6563 return (1); 6564 if (m->m_pkthdr.len < off + len) 6565 return (1); 6566 switch (af) { 6567#ifdef INET 6568 case AF_INET: 6569 if (p == IPPROTO_ICMP) { 6570 if (m->m_len < off) 6571 return (1); 6572 m->m_data += off; 6573 m->m_len -= off; 6574 sum = in_cksum(m, len); 6575 m->m_data -= off; 6576 m->m_len += off; 6577 } else { 6578 if (m->m_len < sizeof(struct ip)) 6579 return (1); 6580 sum = in4_cksum(m, p, off, len); 6581 } 6582 break; 6583#endif /* INET */ 6584#ifdef INET6 6585 case AF_INET6: 6586 if (m->m_len < sizeof(struct ip6_hdr)) 6587 return (1); 6588 sum = in6_cksum(m, p, off, len); 6589 break; 6590#endif /* INET6 */ 6591 default: 6592 return (1); 6593 } 6594 if (sum) { 6595 m->m_pkthdr.csum_flags |= flag_bad; 6596 switch (p) { 6597 case IPPROTO_TCP: 6598 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 6599 break; 6600 case IPPROTO_UDP: 6601 KMOD_UDPSTAT_INC(udps_badsum); 6602 break; 6603#ifdef INET 6604 case IPPROTO_ICMP: 6605 KMOD_ICMPSTAT_INC(icps_checksum); 6606 break; 6607#endif 6608#ifdef INET6 6609 case IPPROTO_ICMPV6: 6610 KMOD_ICMP6STAT_INC(icp6s_checksum); 6611 break; 6612#endif /* INET6 */ 6613 } 6614 return (1); 6615 } 6616 m->m_pkthdr.csum_flags |= flag_ok; 6617 return (0); 6618} 6619#endif 6620 6621#ifndef __FreeBSD__ 6622struct pf_divert * 6623pf_find_divert(struct mbuf *m) 6624{ 6625 struct m_tag *mtag; 6626 6627 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) 6628 return (NULL); 6629 6630 return ((struct pf_divert *)(mtag + 1)); 6631} 6632 6633struct pf_divert * 6634pf_get_divert(struct mbuf *m) 6635{ 6636 struct m_tag *mtag; 6637 6638 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) { 6639 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert), 6640 M_NOWAIT); 6641 if (mtag == NULL) 6642 return (NULL); 6643 bzero(mtag + 1, sizeof(struct pf_divert)); 6644 m_tag_prepend(m, mtag); 6645 } 6646 6647 return ((struct pf_divert *)(mtag + 1)); 6648} 6649#endif 6650 6651#ifdef INET 6652int 6653#ifdef __FreeBSD__ 6654pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6655 struct ether_header *eh, struct inpcb *inp) 6656#else 6657pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6658 struct ether_header *eh) 6659#endif 6660{ 6661 struct pfi_kif *kif; 6662 u_short action, reason = 0, log = 0; 6663 struct mbuf *m = *m0; 6664#ifdef __FreeBSD__ 6665 struct ip *h = NULL; 6666 struct m_tag *ipfwtag; 6667 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6668#else 6669 struct ip *h; 6670 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6671#endif 6672 struct pf_state *s = NULL; 6673 struct pf_ruleset *ruleset = NULL; 6674 struct pf_pdesc pd; 6675 int off, dirndx, pqid = 0; 6676 6677#ifdef __FreeBSD__ 6678 PF_LOCK(); 6679 if (!V_pf_status.running) 6680 { 6681 PF_UNLOCK(); 6682 return (PF_PASS); 6683 } 6684#else 6685 if (!pf_status.running) 6686 return (PF_PASS); 6687#endif 6688 6689 memset(&pd, 0, sizeof(pd)); 6690#ifdef __FreeBSD__ 6691 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 6692 PF_UNLOCK(); 6693 DPFPRINTF(PF_DEBUG_URGENT, 6694 ("pf_test: pf_get_mtag returned NULL\n")); 6695 return (PF_DROP); 6696 } 6697#endif 6698#ifndef __FreeBSD__ 6699 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6700 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 6701 else 6702#endif 6703 kif = (struct pfi_kif *)ifp->if_pf_kif; 6704 6705 if (kif == NULL) { 6706#ifdef __FreeBSD__ 6707 PF_UNLOCK(); 6708#endif 6709 DPFPRINTF(PF_DEBUG_URGENT, 6710 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6711 return (PF_DROP); 6712 } 6713 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6714#ifdef __FreeBSD__ 6715 { 6716 PF_UNLOCK(); 6717#endif 6718 return (PF_PASS); 6719#ifdef __FreeBSD__ 6720 } 6721#endif 6722 6723#ifdef __FreeBSD__ 6724 M_ASSERTPKTHDR(m); 6725#else 6726#ifdef DIAGNOSTIC 6727 if ((m->m_flags & M_PKTHDR) == 0) 6728 panic("non-M_PKTHDR is passed to pf_test"); 6729#endif /* DIAGNOSTIC */ 6730#endif 6731 6732 if (m->m_pkthdr.len < (int)sizeof(*h)) { 6733 action = PF_DROP; 6734 REASON_SET(&reason, PFRES_SHORT); 6735 log = 1; 6736 goto done; 6737 } 6738 6739#ifdef __FreeBSD__ 6740 if (m->m_flags & M_SKIP_FIREWALL) { 6741 PF_UNLOCK(); 6742 return (PF_PASS); 6743 } 6744#else 6745 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 6746 return (PF_PASS); 6747#endif 6748 6749#ifdef __FreeBSD__ 6750 if (ip_divert_ptr != NULL && 6751 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 6752 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 6753 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 6754 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 6755 m_tag_delete(m, ipfwtag); 6756 } 6757 if (pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 6758 m->m_flags |= M_FASTFWD_OURS; 6759 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 6760 } 6761 } else 6762#endif 6763 /* We do IP header normalization and packet reassembly here */ 6764 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6765 action = PF_DROP; 6766 goto done; 6767 } 6768 m = *m0; /* pf_normalize messes with m0 */ 6769 h = mtod(m, struct ip *); 6770 6771 off = h->ip_hl << 2; 6772 if (off < (int)sizeof(*h)) { 6773 action = PF_DROP; 6774 REASON_SET(&reason, PFRES_SHORT); 6775 log = 1; 6776 goto done; 6777 } 6778 6779 pd.src = (struct pf_addr *)&h->ip_src; 6780 pd.dst = (struct pf_addr *)&h->ip_dst; 6781 pd.sport = pd.dport = NULL; 6782 pd.ip_sum = &h->ip_sum; 6783 pd.proto_sum = NULL; 6784 pd.proto = h->ip_p; 6785 pd.dir = dir; 6786 pd.sidx = (dir == PF_IN) ? 0 : 1; 6787 pd.didx = (dir == PF_IN) ? 1 : 0; 6788 pd.af = AF_INET; 6789 pd.tos = h->ip_tos; 6790 pd.tot_len = ntohs(h->ip_len); 6791 pd.eh = eh; 6792 6793 /* handle fragments that didn't get reassembled by normalization */ 6794 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 6795 action = pf_test_fragment(&r, dir, kif, m, h, 6796 &pd, &a, &ruleset); 6797 goto done; 6798 } 6799 6800 switch (h->ip_p) { 6801 6802 case IPPROTO_TCP: { 6803 struct tcphdr th; 6804 6805 pd.hdr.tcp = &th; 6806 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6807 &action, &reason, AF_INET)) { 6808 log = action != PF_PASS; 6809 goto done; 6810 } 6811 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6812 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 6813 pqid = 1; 6814 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6815 if (action == PF_DROP) 6816 goto done; 6817 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6818 &reason); 6819 if (action == PF_PASS) { 6820#if NPFSYNC > 0 6821#ifdef __FreeBSD__ 6822 if (pfsync_update_state_ptr != NULL) 6823 pfsync_update_state_ptr(s); 6824#else 6825 pfsync_update_state(s); 6826#endif 6827#endif /* NPFSYNC */ 6828 r = s->rule.ptr; 6829 a = s->anchor.ptr; 6830 log = s->log; 6831 } else if (s == NULL) 6832#ifdef __FreeBSD__ 6833 action = pf_test_rule(&r, &s, dir, kif, 6834 m, off, h, &pd, &a, &ruleset, NULL, inp); 6835#else 6836 action = pf_test_rule(&r, &s, dir, kif, 6837 m, off, h, &pd, &a, &ruleset, &ipintrq); 6838#endif 6839 break; 6840 } 6841 6842 case IPPROTO_UDP: { 6843 struct udphdr uh; 6844 6845 pd.hdr.udp = &uh; 6846 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6847 &action, &reason, AF_INET)) { 6848 log = action != PF_PASS; 6849 goto done; 6850 } 6851 if (uh.uh_dport == 0 || 6852 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6853 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6854 action = PF_DROP; 6855 REASON_SET(&reason, PFRES_SHORT); 6856 goto done; 6857 } 6858 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6859 if (action == PF_PASS) { 6860#if NPFSYNC > 0 6861#ifdef __FreeBSD__ 6862 if (pfsync_update_state_ptr != NULL) 6863 pfsync_update_state_ptr(s); 6864#else 6865 pfsync_update_state(s); 6866#endif 6867#endif /* NPFSYNC */ 6868 r = s->rule.ptr; 6869 a = s->anchor.ptr; 6870 log = s->log; 6871 } else if (s == NULL) 6872#ifdef __FreeBSD__ 6873 action = pf_test_rule(&r, &s, dir, kif, 6874 m, off, h, &pd, &a, &ruleset, NULL, inp); 6875#else 6876 action = pf_test_rule(&r, &s, dir, kif, 6877 m, off, h, &pd, &a, &ruleset, &ipintrq); 6878#endif 6879 break; 6880 } 6881 6882 case IPPROTO_ICMP: { 6883 struct icmp ih; 6884 6885 pd.hdr.icmp = &ih; 6886 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 6887 &action, &reason, AF_INET)) { 6888 log = action != PF_PASS; 6889 goto done; 6890 } 6891 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6892 &reason); 6893 if (action == PF_PASS) { 6894#if NPFSYNC > 0 6895#ifdef __FreeBSD__ 6896 if (pfsync_update_state_ptr != NULL) 6897 pfsync_update_state_ptr(s); 6898#else 6899 pfsync_update_state(s); 6900#endif 6901#endif /* NPFSYNC */ 6902 r = s->rule.ptr; 6903 a = s->anchor.ptr; 6904 log = s->log; 6905 } else if (s == NULL) 6906#ifdef __FreeBSD__ 6907 action = pf_test_rule(&r, &s, dir, kif, 6908 m, off, h, &pd, &a, &ruleset, NULL, inp); 6909#else 6910 action = pf_test_rule(&r, &s, dir, kif, 6911 m, off, h, &pd, &a, &ruleset, &ipintrq); 6912#endif 6913 break; 6914 } 6915 6916#ifdef INET6 6917 case IPPROTO_ICMPV6: { 6918 action = PF_DROP; 6919 DPFPRINTF(PF_DEBUG_MISC, 6920 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 6921 goto done; 6922 } 6923#endif 6924 6925 default: 6926 action = pf_test_state_other(&s, dir, kif, m, &pd); 6927 if (action == PF_PASS) { 6928#if NPFSYNC > 0 6929#ifdef __FreeBSD__ 6930 if (pfsync_update_state_ptr != NULL) 6931 pfsync_update_state_ptr(s); 6932#else 6933 pfsync_update_state(s); 6934#endif 6935#endif /* NPFSYNC */ 6936 r = s->rule.ptr; 6937 a = s->anchor.ptr; 6938 log = s->log; 6939 } else if (s == NULL) 6940#ifdef __FreeBSD__ 6941 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6942 &pd, &a, &ruleset, NULL, inp); 6943#else 6944 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 6945 &pd, &a, &ruleset, &ipintrq); 6946#endif 6947 break; 6948 } 6949 6950done: 6951 if (action == PF_PASS && h->ip_hl > 5 && 6952 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6953 action = PF_DROP; 6954 REASON_SET(&reason, PFRES_IPOPTIONS); 6955 log = 1; 6956 DPFPRINTF(PF_DEBUG_MISC, 6957 ("pf: dropping packet with ip options\n")); 6958 } 6959 6960 if ((s && s->tag) || r->rtableid >= 0) 6961#ifdef __FreeBSD__ 6962 pf_tag_packet(m, s ? s->tag : 0, r->rtableid, pd.pf_mtag); 6963#else 6964 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 6965#endif 6966 6967 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 6968#ifdef __FreeBSD__ 6969 pd.pf_mtag->statekey = s->key[PF_SK_STACK]; 6970#else 6971 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 6972#endif 6973 6974#ifdef ALTQ 6975 if (action == PF_PASS && r->qid) { 6976#ifdef __FreeBSD__ 6977 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6978 pd.pf_mtag->qid = r->pqid; 6979 else 6980 pd.pf_mtag->qid = r->qid; 6981 /* add hints for ecn */ 6982 pd.pf_mtag->hdr = h; 6983 6984#else 6985 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6986 m->m_pkthdr.pf.qid = r->pqid; 6987 else 6988 m->m_pkthdr.pf.qid = r->qid; 6989 /* add hints for ecn */ 6990 m->m_pkthdr.pf.hdr = h; 6991#endif 6992 } 6993#endif /* ALTQ */ 6994 6995 /* 6996 * connections redirected to loopback should not match sockets 6997 * bound specifically to loopback due to security implications, 6998 * see tcp_input() and in_pcblookup_listen(). 6999 */ 7000 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7001 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7002 (s->nat_rule.ptr->action == PF_RDR || 7003 s->nat_rule.ptr->action == PF_BINAT) && 7004 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 7005#ifdef __FreeBSD__ 7006 m->m_flags |= M_SKIP_FIREWALL; 7007#else 7008 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 7009#endif 7010 7011#ifdef __FreeBSD__ 7012 if (action == PF_PASS && r->divert.port && 7013 ip_divert_ptr != NULL && !PACKET_LOOPED()) { 7014 7015 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 7016 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 7017 if (ipfwtag != NULL) { 7018 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 7019 ntohs(r->divert.port); 7020 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 7021 7022 m_tag_prepend(m, ipfwtag); 7023 7024 PF_UNLOCK(); 7025 7026 if (m->m_flags & M_FASTFWD_OURS) { 7027 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; 7028 m->m_flags &= ~M_FASTFWD_OURS; 7029 } 7030 7031 ip_divert_ptr(*m0, 7032 dir == PF_IN ? DIR_IN : DIR_OUT); 7033 *m0 = NULL; 7034 return (action); 7035 } else { 7036 /* XXX: ipfw has the same behaviour! */ 7037 action = PF_DROP; 7038 REASON_SET(&reason, PFRES_MEMORY); 7039 log = 1; 7040 DPFPRINTF(PF_DEBUG_MISC, 7041 ("pf: failed to allocate divert tag\n")); 7042 } 7043 } 7044#else 7045 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 7046 struct pf_divert *divert; 7047 7048 if ((divert = pf_get_divert(m))) { 7049 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 7050 divert->port = r->divert.port; 7051 divert->addr.ipv4 = r->divert.addr.v4; 7052 } 7053 } 7054#endif 7055 7056 if (log) { 7057 struct pf_rule *lr; 7058 7059 if (s != NULL && s->nat_rule.ptr != NULL && 7060 s->nat_rule.ptr->log & PF_LOG_ALL) 7061 lr = s->nat_rule.ptr; 7062 else 7063 lr = r; 7064 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 7065 &pd); 7066 } 7067 7068 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7069 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 7070 7071 if (action == PF_PASS || r->action == PF_DROP) { 7072 dirndx = (dir == PF_OUT); 7073 r->packets[dirndx]++; 7074 r->bytes[dirndx] += pd.tot_len; 7075 if (a != NULL) { 7076 a->packets[dirndx]++; 7077 a->bytes[dirndx] += pd.tot_len; 7078 } 7079 if (s != NULL) { 7080 if (s->nat_rule.ptr != NULL) { 7081 s->nat_rule.ptr->packets[dirndx]++; 7082 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7083 } 7084 if (s->src_node != NULL) { 7085 s->src_node->packets[dirndx]++; 7086 s->src_node->bytes[dirndx] += pd.tot_len; 7087 } 7088 if (s->nat_src_node != NULL) { 7089 s->nat_src_node->packets[dirndx]++; 7090 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7091 } 7092 dirndx = (dir == s->direction) ? 0 : 1; 7093 s->packets[dirndx]++; 7094 s->bytes[dirndx] += pd.tot_len; 7095 } 7096 tr = r; 7097 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7098#ifdef __FreeBSD__ 7099 if (nr != NULL && r == &V_pf_default_rule) 7100#else 7101 if (nr != NULL && r == &pf_default_rule) 7102#endif 7103 tr = nr; 7104 if (tr->src.addr.type == PF_ADDR_TABLE) 7105 pfr_update_stats(tr->src.addr.p.tbl, 7106 (s == NULL) ? pd.src : 7107 &s->key[(s->direction == PF_IN)]-> 7108 addr[(s->direction == PF_OUT)], 7109 pd.af, pd.tot_len, dir == PF_OUT, 7110 r->action == PF_PASS, tr->src.neg); 7111 if (tr->dst.addr.type == PF_ADDR_TABLE) 7112 pfr_update_stats(tr->dst.addr.p.tbl, 7113 (s == NULL) ? pd.dst : 7114 &s->key[(s->direction == PF_IN)]-> 7115 addr[(s->direction == PF_IN)], 7116 pd.af, pd.tot_len, dir == PF_OUT, 7117 r->action == PF_PASS, tr->dst.neg); 7118 } 7119 7120 switch (action) { 7121 case PF_SYNPROXY_DROP: 7122 m_freem(*m0); 7123 case PF_DEFER: 7124 *m0 = NULL; 7125 action = PF_PASS; 7126 break; 7127 default: 7128 /* pf_route can free the mbuf causing *m0 to become NULL */ 7129 if (r->rt) 7130 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 7131 break; 7132 } 7133#ifdef __FreeBSD__ 7134 PF_UNLOCK(); 7135#endif 7136 return (action); 7137} 7138#endif /* INET */ 7139 7140#ifdef INET6 7141int 7142#ifdef __FreeBSD__ 7143pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7144 struct ether_header *eh, struct inpcb *inp) 7145#else 7146pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7147 struct ether_header *eh) 7148#endif 7149{ 7150 struct pfi_kif *kif; 7151 u_short action, reason = 0, log = 0; 7152 struct mbuf *m = *m0, *n = NULL; 7153#ifdef __FreeBSD__ 7154 struct ip6_hdr *h = NULL; 7155 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 7156#else 7157 struct ip6_hdr *h; 7158 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 7159#endif 7160 struct pf_state *s = NULL; 7161 struct pf_ruleset *ruleset = NULL; 7162 struct pf_pdesc pd; 7163 int off, terminal = 0, dirndx, rh_cnt = 0; 7164 7165#ifdef __FreeBSD__ 7166 PF_LOCK(); 7167 if (!V_pf_status.running) { 7168 PF_UNLOCK(); 7169 return (PF_PASS); 7170 } 7171#else 7172 if (!pf_status.running) 7173 return (PF_PASS); 7174#endif 7175 7176 memset(&pd, 0, sizeof(pd)); 7177#ifdef __FreeBSD__ 7178 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 7179 PF_UNLOCK(); 7180 DPFPRINTF(PF_DEBUG_URGENT, 7181 ("pf_test: pf_get_mtag returned NULL\n")); 7182 return (PF_DROP); 7183 } 7184#endif 7185#ifndef __FreeBSD__ 7186 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 7187 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif; 7188 else 7189#endif 7190 kif = (struct pfi_kif *)ifp->if_pf_kif; 7191 7192 if (kif == NULL) { 7193#ifdef __FreeBSD__ 7194 PF_UNLOCK(); 7195#endif 7196 DPFPRINTF(PF_DEBUG_URGENT, 7197 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 7198 return (PF_DROP); 7199 } 7200 if (kif->pfik_flags & PFI_IFLAG_SKIP) 7201#ifdef __FreeBSD__ 7202 { 7203 PF_UNLOCK(); 7204#endif 7205 return (PF_PASS); 7206#ifdef __FreeBSD__ 7207 } 7208#endif 7209 7210#ifdef __FreeBSD__ 7211 M_ASSERTPKTHDR(m); 7212#else 7213#ifdef DIAGNOSTIC 7214 if ((m->m_flags & M_PKTHDR) == 0) 7215 panic("non-M_PKTHDR is passed to pf_test6"); 7216#endif /* DIAGNOSTIC */ 7217#endif 7218 7219 if (m->m_pkthdr.len < (int)sizeof(*h)) { 7220 action = PF_DROP; 7221 REASON_SET(&reason, PFRES_SHORT); 7222 log = 1; 7223 goto done; 7224 } 7225 7226#ifdef __FreeBSD__ 7227 if (pd.pf_mtag->flags & PF_TAG_GENERATED) { 7228 PF_UNLOCK(); 7229#else 7230 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED) 7231#endif 7232 return (PF_PASS); 7233#ifdef __FreeBSD__ 7234 } 7235#endif 7236 7237 /* We do IP header normalization and packet reassembly here */ 7238 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 7239 action = PF_DROP; 7240 goto done; 7241 } 7242 m = *m0; /* pf_normalize messes with m0 */ 7243 h = mtod(m, struct ip6_hdr *); 7244 7245#if 1 7246 /* 7247 * we do not support jumbogram yet. if we keep going, zero ip6_plen 7248 * will do something bad, so drop the packet for now. 7249 */ 7250 if (htons(h->ip6_plen) == 0) { 7251 action = PF_DROP; 7252 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 7253 goto done; 7254 } 7255#endif 7256 7257 pd.src = (struct pf_addr *)&h->ip6_src; 7258 pd.dst = (struct pf_addr *)&h->ip6_dst; 7259 pd.sport = pd.dport = NULL; 7260 pd.ip_sum = NULL; 7261 pd.proto_sum = NULL; 7262 pd.dir = dir; 7263 pd.sidx = (dir == PF_IN) ? 0 : 1; 7264 pd.didx = (dir == PF_IN) ? 1 : 0; 7265 pd.af = AF_INET6; 7266 pd.tos = 0; 7267 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 7268 pd.eh = eh; 7269 7270 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 7271 pd.proto = h->ip6_nxt; 7272 do { 7273 switch (pd.proto) { 7274 case IPPROTO_FRAGMENT: 7275 action = pf_test_fragment(&r, dir, kif, m, h, 7276 &pd, &a, &ruleset); 7277 if (action == PF_DROP) 7278 REASON_SET(&reason, PFRES_FRAG); 7279 goto done; 7280 case IPPROTO_ROUTING: { 7281 struct ip6_rthdr rthdr; 7282 7283 if (rh_cnt++) { 7284 DPFPRINTF(PF_DEBUG_MISC, 7285 ("pf: IPv6 more than one rthdr\n")); 7286 action = PF_DROP; 7287 REASON_SET(&reason, PFRES_IPOPTIONS); 7288 log = 1; 7289 goto done; 7290 } 7291 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 7292 &reason, pd.af)) { 7293 DPFPRINTF(PF_DEBUG_MISC, 7294 ("pf: IPv6 short rthdr\n")); 7295 action = PF_DROP; 7296 REASON_SET(&reason, PFRES_SHORT); 7297 log = 1; 7298 goto done; 7299 } 7300 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 7301 DPFPRINTF(PF_DEBUG_MISC, 7302 ("pf: IPv6 rthdr0\n")); 7303 action = PF_DROP; 7304 REASON_SET(&reason, PFRES_IPOPTIONS); 7305 log = 1; 7306 goto done; 7307 } 7308 /* FALLTHROUGH */ 7309 } 7310 case IPPROTO_AH: 7311 case IPPROTO_HOPOPTS: 7312 case IPPROTO_DSTOPTS: { 7313 /* get next header and header length */ 7314 struct ip6_ext opt6; 7315 7316 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 7317 NULL, &reason, pd.af)) { 7318 DPFPRINTF(PF_DEBUG_MISC, 7319 ("pf: IPv6 short opt\n")); 7320 action = PF_DROP; 7321 log = 1; 7322 goto done; 7323 } 7324 if (pd.proto == IPPROTO_AH) 7325 off += (opt6.ip6e_len + 2) * 4; 7326 else 7327 off += (opt6.ip6e_len + 1) * 8; 7328 pd.proto = opt6.ip6e_nxt; 7329 /* goto the next header */ 7330 break; 7331 } 7332 default: 7333 terminal++; 7334 break; 7335 } 7336 } while (!terminal); 7337 7338 /* if there's no routing header, use unmodified mbuf for checksumming */ 7339 if (!n) 7340 n = m; 7341 7342 switch (pd.proto) { 7343 7344 case IPPROTO_TCP: { 7345 struct tcphdr th; 7346 7347 pd.hdr.tcp = &th; 7348 if (!pf_pull_hdr(m, off, &th, sizeof(th), 7349 &action, &reason, AF_INET6)) { 7350 log = action != PF_PASS; 7351 goto done; 7352 } 7353 pd.p_len = pd.tot_len - off - (th.th_off << 2); 7354 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7355 if (action == PF_DROP) 7356 goto done; 7357 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7358 &reason); 7359 if (action == PF_PASS) { 7360#if NPFSYNC > 0 7361#ifdef __FreeBSD__ 7362 if (pfsync_update_state_ptr != NULL) 7363 pfsync_update_state_ptr(s); 7364#else 7365 pfsync_update_state(s); 7366#endif 7367#endif /* NPFSYNC */ 7368 r = s->rule.ptr; 7369 a = s->anchor.ptr; 7370 log = s->log; 7371 } else if (s == NULL) 7372#ifdef __FreeBSD__ 7373 action = pf_test_rule(&r, &s, dir, kif, 7374 m, off, h, &pd, &a, &ruleset, NULL, inp); 7375#else 7376 action = pf_test_rule(&r, &s, dir, kif, 7377 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7378#endif 7379 break; 7380 } 7381 7382 case IPPROTO_UDP: { 7383 struct udphdr uh; 7384 7385 pd.hdr.udp = &uh; 7386 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7387 &action, &reason, AF_INET6)) { 7388 log = action != PF_PASS; 7389 goto done; 7390 } 7391 if (uh.uh_dport == 0 || 7392 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7393 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7394 action = PF_DROP; 7395 REASON_SET(&reason, PFRES_SHORT); 7396 goto done; 7397 } 7398 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7399 if (action == PF_PASS) { 7400#if NPFSYNC > 0 7401#ifdef __FreeBSD__ 7402 if (pfsync_update_state_ptr != NULL) 7403 pfsync_update_state_ptr(s); 7404#else 7405 pfsync_update_state(s); 7406#endif 7407#endif /* NPFSYNC */ 7408 r = s->rule.ptr; 7409 a = s->anchor.ptr; 7410 log = s->log; 7411 } else if (s == NULL) 7412#ifdef __FreeBSD__ 7413 action = pf_test_rule(&r, &s, dir, kif, 7414 m, off, h, &pd, &a, &ruleset, NULL, inp); 7415#else 7416 action = pf_test_rule(&r, &s, dir, kif, 7417 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7418#endif 7419 break; 7420 } 7421 7422 case IPPROTO_ICMP: { 7423 action = PF_DROP; 7424 DPFPRINTF(PF_DEBUG_MISC, 7425 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 7426 goto done; 7427 } 7428 7429 case IPPROTO_ICMPV6: { 7430 struct icmp6_hdr ih; 7431 7432 pd.hdr.icmp6 = &ih; 7433 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 7434 &action, &reason, AF_INET6)) { 7435 log = action != PF_PASS; 7436 goto done; 7437 } 7438 action = pf_test_state_icmp(&s, dir, kif, 7439 m, off, h, &pd, &reason); 7440 if (action == PF_PASS) { 7441#if NPFSYNC > 0 7442#ifdef __FreeBSD__ 7443 if (pfsync_update_state_ptr != NULL) 7444 pfsync_update_state_ptr(s); 7445#else 7446 pfsync_update_state(s); 7447#endif 7448#endif /* NPFSYNC */ 7449 r = s->rule.ptr; 7450 a = s->anchor.ptr; 7451 log = s->log; 7452 } else if (s == NULL) 7453#ifdef __FreeBSD__ 7454 action = pf_test_rule(&r, &s, dir, kif, 7455 m, off, h, &pd, &a, &ruleset, NULL, inp); 7456#else 7457 action = pf_test_rule(&r, &s, dir, kif, 7458 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7459#endif 7460 break; 7461 } 7462 7463 default: 7464 action = pf_test_state_other(&s, dir, kif, m, &pd); 7465 if (action == PF_PASS) { 7466#if NPFSYNC > 0 7467#ifdef __FreeBSD__ 7468 if (pfsync_update_state_ptr != NULL) 7469 pfsync_update_state_ptr(s); 7470#else 7471 pfsync_update_state(s); 7472#endif 7473#endif /* NPFSYNC */ 7474 r = s->rule.ptr; 7475 a = s->anchor.ptr; 7476 log = s->log; 7477 } else if (s == NULL) 7478#ifdef __FreeBSD__ 7479 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 7480 &pd, &a, &ruleset, NULL, inp); 7481#else 7482 action = pf_test_rule(&r, &s, dir, kif, m, off, h, 7483 &pd, &a, &ruleset, &ip6intrq); 7484#endif 7485 break; 7486 } 7487 7488done: 7489 if (n != m) { 7490 m_freem(n); 7491 n = NULL; 7492 } 7493 7494 /* handle dangerous IPv6 extension headers. */ 7495 if (action == PF_PASS && rh_cnt && 7496 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 7497 action = PF_DROP; 7498 REASON_SET(&reason, PFRES_IPOPTIONS); 7499 log = 1; 7500 DPFPRINTF(PF_DEBUG_MISC, 7501 ("pf: dropping packet with dangerous v6 headers\n")); 7502 } 7503 7504 if ((s && s->tag) || r->rtableid >= 0) 7505#ifdef __FreeBSD__ 7506 pf_tag_packet(m, s ? s->tag : 0, r->rtableid, pd.pf_mtag); 7507#else 7508 pf_tag_packet(m, s ? s->tag : 0, r->rtableid); 7509#endif 7510 7511 if (dir == PF_IN && s && s->key[PF_SK_STACK]) 7512#ifdef __FreeBSD__ 7513 pd.pf_mtag->statekey = s->key[PF_SK_STACK]; 7514#else 7515 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK]; 7516#endif 7517 7518#ifdef ALTQ 7519 if (action == PF_PASS && r->qid) { 7520#ifdef __FreeBSD__ 7521 if (pd.tos & IPTOS_LOWDELAY) 7522 pd.pf_mtag->qid = r->pqid; 7523 else 7524 pd.pf_mtag->qid = r->qid; 7525 /* add hints for ecn */ 7526 pd.pf_mtag->hdr = h; 7527#else 7528 if (pd.tos & IPTOS_LOWDELAY) 7529 m->m_pkthdr.pf.qid = r->pqid; 7530 else 7531 m->m_pkthdr.pf.qid = r->qid; 7532 /* add hints for ecn */ 7533 m->m_pkthdr.pf.hdr = h; 7534#endif 7535 } 7536#endif /* ALTQ */ 7537 7538 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7539 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7540 (s->nat_rule.ptr->action == PF_RDR || 7541 s->nat_rule.ptr->action == PF_BINAT) && 7542 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7543#ifdef __FreeBSD__ 7544 m->m_flags |= M_SKIP_FIREWALL; 7545#else 7546 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST; 7547#endif 7548 7549#ifdef __FreeBSD__ 7550 /* XXX: Anybody working on it?! */ 7551 if (r->divert.port) 7552 printf("pf: divert(9) is not supported for IPv6\n"); 7553#else 7554 if (dir == PF_IN && action == PF_PASS && r->divert.port) { 7555 struct pf_divert *divert; 7556 7557 if ((divert = pf_get_divert(m))) { 7558 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED; 7559 divert->port = r->divert.port; 7560 divert->addr.ipv6 = r->divert.addr.v6; 7561 } 7562 } 7563#endif 7564 7565 if (log) { 7566 struct pf_rule *lr; 7567 7568 if (s != NULL && s->nat_rule.ptr != NULL && 7569 s->nat_rule.ptr->log & PF_LOG_ALL) 7570 lr = s->nat_rule.ptr; 7571 else 7572 lr = r; 7573 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 7574 &pd); 7575 } 7576 7577 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7578 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7579 7580 if (action == PF_PASS || r->action == PF_DROP) { 7581 dirndx = (dir == PF_OUT); 7582 r->packets[dirndx]++; 7583 r->bytes[dirndx] += pd.tot_len; 7584 if (a != NULL) { 7585 a->packets[dirndx]++; 7586 a->bytes[dirndx] += pd.tot_len; 7587 } 7588 if (s != NULL) { 7589 if (s->nat_rule.ptr != NULL) { 7590 s->nat_rule.ptr->packets[dirndx]++; 7591 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7592 } 7593 if (s->src_node != NULL) { 7594 s->src_node->packets[dirndx]++; 7595 s->src_node->bytes[dirndx] += pd.tot_len; 7596 } 7597 if (s->nat_src_node != NULL) { 7598 s->nat_src_node->packets[dirndx]++; 7599 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7600 } 7601 dirndx = (dir == s->direction) ? 0 : 1; 7602 s->packets[dirndx]++; 7603 s->bytes[dirndx] += pd.tot_len; 7604 } 7605 tr = r; 7606 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7607#ifdef __FreeBSD__ 7608 if (nr != NULL && r == &V_pf_default_rule) 7609#else 7610 if (nr != NULL && r == &pf_default_rule) 7611#endif 7612 tr = nr; 7613 if (tr->src.addr.type == PF_ADDR_TABLE) 7614 pfr_update_stats(tr->src.addr.p.tbl, 7615 (s == NULL) ? pd.src : 7616 &s->key[(s->direction == PF_IN)]->addr[0], 7617 pd.af, pd.tot_len, dir == PF_OUT, 7618 r->action == PF_PASS, tr->src.neg); 7619 if (tr->dst.addr.type == PF_ADDR_TABLE) 7620 pfr_update_stats(tr->dst.addr.p.tbl, 7621 (s == NULL) ? pd.dst : 7622 &s->key[(s->direction == PF_IN)]->addr[1], 7623 pd.af, pd.tot_len, dir == PF_OUT, 7624 r->action == PF_PASS, tr->dst.neg); 7625 } 7626 7627 switch (action) { 7628 case PF_SYNPROXY_DROP: 7629 m_freem(*m0); 7630 case PF_DEFER: 7631 *m0 = NULL; 7632 action = PF_PASS; 7633 break; 7634 default: 7635 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7636 if (r->rt) 7637 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 7638 break; 7639 } 7640 7641#ifdef __FreeBSD__ 7642 PF_UNLOCK(); 7643#endif 7644 return (action); 7645} 7646#endif /* INET6 */ 7647 7648int 7649pf_check_congestion(struct ifqueue *ifq) 7650{ 7651#ifdef __FreeBSD__ 7652 /* XXX_IMPORT: later */ 7653 return (0); 7654#else 7655 if (ifq->ifq_congestion) 7656 return (1); 7657 else 7658 return (0); 7659#endif 7660} 7661 7662/* 7663 * must be called whenever any addressing information such as 7664 * address, port, protocol has changed 7665 */ 7666void 7667pf_pkt_addr_changed(struct mbuf *m) 7668{ 7669#ifdef __FreeBSD__ 7670 struct pf_mtag *pf_tag; 7671 7672 if ((pf_tag = pf_find_mtag(m)) != NULL) 7673 pf_tag->statekey = NULL; 7674#else 7675 m->m_pkthdr.pf.statekey = NULL; 7676#endif 7677} 7678