pf.c revision 290669
1/*- 2 * Copyright (c) 2001 Daniel Hartmeier 3 * Copyright (c) 2002 - 2008 Henning Brauer 4 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * - Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * - Redistributions in binary form must reproduce the above 14 * copyright notice, this list of conditions and the following 15 * disclaimer in the documentation and/or other materials provided 16 * with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 26 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 28 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 * 31 * Effort sponsored in part by the Defense Advanced Research Projects 32 * Agency (DARPA) and Air Force Research Laboratory, Air Force 33 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 34 * 35 * $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ 36 */ 37 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: stable/10/sys/netpfil/pf/pf.c 290669 2015-11-11 12:36:42Z kp $"); 40 41#include "opt_inet.h" 42#include "opt_inet6.h" 43#include "opt_bpf.h" 44#include "opt_pf.h" 45 46#include <sys/param.h> 47#include <sys/bus.h> 48#include <sys/endian.h> 49#include <sys/hash.h> 50#include <sys/interrupt.h> 51#include <sys/kernel.h> 52#include <sys/kthread.h> 53#include <sys/limits.h> 54#include <sys/mbuf.h> 55#include <sys/md5.h> 56#include <sys/random.h> 57#include <sys/refcount.h> 58#include <sys/socket.h> 59#include <sys/sysctl.h> 60#include <sys/taskqueue.h> 61#include <sys/ucred.h> 62 63#include <net/if.h> 64#include <net/if_types.h> 65#include <net/route.h> 66#include <net/radix_mpath.h> 67#include <net/vnet.h> 68 69#include <net/pfvar.h> 70#include <net/if_pflog.h> 71#include <net/if_pfsync.h> 72 73#include <netinet/in_pcb.h> 74#include <netinet/in_var.h> 75#include <netinet/ip.h> 76#include <netinet/ip_fw.h> 77#include <netinet/ip_icmp.h> 78#include <netinet/icmp_var.h> 79#include <netinet/ip_var.h> 80#include <netinet/tcp.h> 81#include <netinet/tcp_fsm.h> 82#include <netinet/tcp_seq.h> 83#include <netinet/tcp_timer.h> 84#include <netinet/tcp_var.h> 85#include <netinet/udp.h> 86#include <netinet/udp_var.h> 87 88#include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */ 89 90#ifdef INET6 91#include <netinet/ip6.h> 92#include <netinet/icmp6.h> 93#include <netinet6/nd6.h> 94#include <netinet6/ip6_var.h> 95#include <netinet6/in6_pcb.h> 96#endif /* INET6 */ 97 98#include <machine/in_cksum.h> 99#include <security/mac/mac_framework.h> 100 101#define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 102 103/* 104 * Global variables 105 */ 106 107/* state tables */ 108VNET_DEFINE(struct pf_altqqueue, pf_altqs[2]); 109VNET_DEFINE(struct pf_palist, pf_pabuf); 110VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 111VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 112VNET_DEFINE(struct pf_kstatus, pf_status); 113 114VNET_DEFINE(u_int32_t, ticket_altqs_active); 115VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 116VNET_DEFINE(int, altqs_inactive_open); 117VNET_DEFINE(u_int32_t, ticket_pabuf); 118 119VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 120#define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 121VNET_DEFINE(u_char, pf_tcp_secret[16]); 122#define V_pf_tcp_secret VNET(pf_tcp_secret) 123VNET_DEFINE(int, pf_tcp_secret_init); 124#define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 125VNET_DEFINE(int, pf_tcp_iss_off); 126#define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 127 128/* 129 * Queue for pf_intr() sends. 130 */ 131static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 132struct pf_send_entry { 133 STAILQ_ENTRY(pf_send_entry) pfse_next; 134 struct mbuf *pfse_m; 135 enum { 136 PFSE_IP, 137 PFSE_IP6, 138 PFSE_ICMP, 139 PFSE_ICMP6, 140 } pfse_type; 141 union { 142 struct route ro; 143 struct { 144 int type; 145 int code; 146 int mtu; 147 } icmpopts; 148 } u; 149#define pfse_ro u.ro 150#define pfse_icmp_type u.icmpopts.type 151#define pfse_icmp_code u.icmpopts.code 152#define pfse_icmp_mtu u.icmpopts.mtu 153}; 154 155STAILQ_HEAD(pf_send_head, pf_send_entry); 156static VNET_DEFINE(struct pf_send_head, pf_sendqueue); 157#define V_pf_sendqueue VNET(pf_sendqueue) 158 159static struct mtx pf_sendqueue_mtx; 160#define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 161#define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 162 163/* 164 * Queue for pf_overload_task() tasks. 165 */ 166struct pf_overload_entry { 167 SLIST_ENTRY(pf_overload_entry) next; 168 struct pf_addr addr; 169 sa_family_t af; 170 uint8_t dir; 171 struct pf_rule *rule; 172}; 173 174SLIST_HEAD(pf_overload_head, pf_overload_entry); 175static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue); 176#define V_pf_overloadqueue VNET(pf_overloadqueue) 177static VNET_DEFINE(struct task, pf_overloadtask); 178#define V_pf_overloadtask VNET(pf_overloadtask) 179 180static struct mtx pf_overloadqueue_mtx; 181#define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) 182#define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) 183 184VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules); 185struct mtx pf_unlnkdrules_mtx; 186 187static VNET_DEFINE(uma_zone_t, pf_sources_z); 188#define V_pf_sources_z VNET(pf_sources_z) 189uma_zone_t pf_mtag_z; 190VNET_DEFINE(uma_zone_t, pf_state_z); 191VNET_DEFINE(uma_zone_t, pf_state_key_z); 192 193VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]); 194#define PFID_CPUBITS 8 195#define PFID_CPUSHIFT (sizeof(uint64_t) * NBBY - PFID_CPUBITS) 196#define PFID_CPUMASK ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT) 197#define PFID_MAXID (~PFID_CPUMASK) 198CTASSERT((1 << PFID_CPUBITS) >= MAXCPU); 199 200static void pf_src_tree_remove_state(struct pf_state *); 201static void pf_init_threshold(struct pf_threshold *, u_int32_t, 202 u_int32_t); 203static void pf_add_threshold(struct pf_threshold *); 204static int pf_check_threshold(struct pf_threshold *); 205 206static void pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *, 207 u_int16_t *, u_int16_t *, struct pf_addr *, 208 u_int16_t, u_int8_t, sa_family_t); 209static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 210 struct tcphdr *, struct pf_state_peer *); 211static void pf_change_icmp(struct pf_addr *, u_int16_t *, 212 struct pf_addr *, struct pf_addr *, u_int16_t, 213 u_int16_t *, u_int16_t *, u_int16_t *, 214 u_int16_t *, u_int8_t, sa_family_t); 215static void pf_send_tcp(struct mbuf *, 216 const struct pf_rule *, sa_family_t, 217 const struct pf_addr *, const struct pf_addr *, 218 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 219 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 220 u_int16_t, struct ifnet *); 221static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 222 sa_family_t, struct pf_rule *); 223static void pf_detach_state(struct pf_state *); 224static int pf_state_key_attach(struct pf_state_key *, 225 struct pf_state_key *, struct pf_state *); 226static void pf_state_key_detach(struct pf_state *, int); 227static int pf_state_key_ctor(void *, int, void *, int); 228static u_int32_t pf_tcp_iss(struct pf_pdesc *); 229static int pf_test_rule(struct pf_rule **, struct pf_state **, 230 int, struct pfi_kif *, struct mbuf *, int, 231 struct pf_pdesc *, struct pf_rule **, 232 struct pf_ruleset **, struct inpcb *); 233static int pf_create_state(struct pf_rule *, struct pf_rule *, 234 struct pf_rule *, struct pf_pdesc *, 235 struct pf_src_node *, struct pf_state_key *, 236 struct pf_state_key *, struct mbuf *, int, 237 u_int16_t, u_int16_t, int *, struct pfi_kif *, 238 struct pf_state **, int, u_int16_t, u_int16_t, 239 int); 240static int pf_test_fragment(struct pf_rule **, int, 241 struct pfi_kif *, struct mbuf *, void *, 242 struct pf_pdesc *, struct pf_rule **, 243 struct pf_ruleset **); 244static int pf_tcp_track_full(struct pf_state_peer *, 245 struct pf_state_peer *, struct pf_state **, 246 struct pfi_kif *, struct mbuf *, int, 247 struct pf_pdesc *, u_short *, int *); 248static int pf_tcp_track_sloppy(struct pf_state_peer *, 249 struct pf_state_peer *, struct pf_state **, 250 struct pf_pdesc *, u_short *); 251static int pf_test_state_tcp(struct pf_state **, int, 252 struct pfi_kif *, struct mbuf *, int, 253 void *, struct pf_pdesc *, u_short *); 254static int pf_test_state_udp(struct pf_state **, int, 255 struct pfi_kif *, struct mbuf *, int, 256 void *, struct pf_pdesc *); 257static int pf_test_state_icmp(struct pf_state **, int, 258 struct pfi_kif *, struct mbuf *, int, 259 void *, struct pf_pdesc *, u_short *); 260static int pf_test_state_other(struct pf_state **, int, 261 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 262static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 263 sa_family_t); 264static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 265 sa_family_t); 266static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 267 int, u_int16_t); 268static int pf_check_proto_cksum(struct mbuf *, int, int, 269 u_int8_t, sa_family_t); 270static void pf_print_state_parts(struct pf_state *, 271 struct pf_state_key *, struct pf_state_key *); 272static int pf_addr_wrap_neq(struct pf_addr_wrap *, 273 struct pf_addr_wrap *); 274static struct pf_state *pf_find_state(struct pfi_kif *, 275 struct pf_state_key_cmp *, u_int); 276static int pf_src_connlimit(struct pf_state **); 277static void pf_overload_task(void *v, int pending); 278static int pf_insert_src_node(struct pf_src_node **, 279 struct pf_rule *, struct pf_addr *, sa_family_t); 280static u_int pf_purge_expired_states(u_int, int); 281static void pf_purge_unlinked_rules(void); 282static int pf_mtag_uminit(void *, int, int); 283static void pf_mtag_free(struct m_tag *); 284#ifdef INET 285static void pf_route(struct mbuf **, struct pf_rule *, int, 286 struct ifnet *, struct pf_state *, 287 struct pf_pdesc *); 288#endif /* INET */ 289#ifdef INET6 290static void pf_change_a6(struct pf_addr *, u_int16_t *, 291 struct pf_addr *, u_int8_t); 292static void pf_route6(struct mbuf **, struct pf_rule *, int, 293 struct ifnet *, struct pf_state *, 294 struct pf_pdesc *); 295#endif /* INET6 */ 296 297int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 298 299VNET_DECLARE(int, pf_end_threads); 300 301VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 302 303#define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 304 (pd)->pf_mtag->flags & PF_PACKET_LOOPED) 305 306#define STATE_LOOKUP(i, k, d, s, pd) \ 307 do { \ 308 (s) = pf_find_state((i), (k), (d)); \ 309 if ((s) == NULL) \ 310 return (PF_DROP); \ 311 if (PACKET_LOOPED(pd)) \ 312 return (PF_PASS); \ 313 if ((d) == PF_OUT && \ 314 (((s)->rule.ptr->rt == PF_ROUTETO && \ 315 (s)->rule.ptr->direction == PF_OUT) || \ 316 ((s)->rule.ptr->rt == PF_REPLYTO && \ 317 (s)->rule.ptr->direction == PF_IN)) && \ 318 (s)->rt_kif != NULL && \ 319 (s)->rt_kif != (i)) \ 320 return (PF_PASS); \ 321 } while (0) 322 323#define BOUND_IFACE(r, k) \ 324 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 325 326#define STATE_INC_COUNTERS(s) \ 327 do { \ 328 counter_u64_add(s->rule.ptr->states_cur, 1); \ 329 counter_u64_add(s->rule.ptr->states_tot, 1); \ 330 if (s->anchor.ptr != NULL) { \ 331 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 332 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 333 } \ 334 if (s->nat_rule.ptr != NULL) { \ 335 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 336 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 337 } \ 338 } while (0) 339 340#define STATE_DEC_COUNTERS(s) \ 341 do { \ 342 if (s->nat_rule.ptr != NULL) \ 343 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 344 if (s->anchor.ptr != NULL) \ 345 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 346 counter_u64_add(s->rule.ptr->states_cur, -1); \ 347 } while (0) 348 349static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 350VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 351VNET_DEFINE(struct pf_idhash *, pf_idhash); 352VNET_DEFINE(struct pf_srchash *, pf_srchash); 353 354SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)"); 355 356u_long pf_hashmask; 357u_long pf_srchashmask; 358static u_long pf_hashsize; 359static u_long pf_srchashsize; 360 361SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 362 &pf_hashsize, 0, "Size of pf(4) states hashtable"); 363SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 364 &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable"); 365 366VNET_DEFINE(void *, pf_swi_cookie); 367 368VNET_DEFINE(uint32_t, pf_hashseed); 369#define V_pf_hashseed VNET(pf_hashseed) 370 371int 372pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af) 373{ 374 375 switch (af) { 376#ifdef INET 377 case AF_INET: 378 if (a->addr32[0] > b->addr32[0]) 379 return (1); 380 if (a->addr32[0] < b->addr32[0]) 381 return (-1); 382 break; 383#endif /* INET */ 384#ifdef INET6 385 case AF_INET6: 386 if (a->addr32[3] > b->addr32[3]) 387 return (1); 388 if (a->addr32[3] < b->addr32[3]) 389 return (-1); 390 if (a->addr32[2] > b->addr32[2]) 391 return (1); 392 if (a->addr32[2] < b->addr32[2]) 393 return (-1); 394 if (a->addr32[1] > b->addr32[1]) 395 return (1); 396 if (a->addr32[1] < b->addr32[1]) 397 return (-1); 398 if (a->addr32[0] > b->addr32[0]) 399 return (1); 400 if (a->addr32[0] < b->addr32[0]) 401 return (-1); 402 break; 403#endif /* INET6 */ 404 default: 405 panic("%s: unknown address family %u", __func__, af); 406 } 407 return (0); 408} 409 410static __inline uint32_t 411pf_hashkey(struct pf_state_key *sk) 412{ 413 uint32_t h; 414 415 h = murmur3_aligned_32((uint32_t *)sk, 416 sizeof(struct pf_state_key_cmp), 417 V_pf_hashseed); 418 419 return (h & pf_hashmask); 420} 421 422static __inline uint32_t 423pf_hashsrc(struct pf_addr *addr, sa_family_t af) 424{ 425 uint32_t h; 426 427 switch (af) { 428 case AF_INET: 429 h = murmur3_aligned_32((uint32_t *)&addr->v4, 430 sizeof(addr->v4), V_pf_hashseed); 431 break; 432 case AF_INET6: 433 h = murmur3_aligned_32((uint32_t *)&addr->v6, 434 sizeof(addr->v6), V_pf_hashseed); 435 break; 436 default: 437 panic("%s: unknown address family %u", __func__, af); 438 } 439 440 return (h & pf_srchashmask); 441} 442 443#ifdef INET6 444void 445pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 446{ 447 switch (af) { 448#ifdef INET 449 case AF_INET: 450 dst->addr32[0] = src->addr32[0]; 451 break; 452#endif /* INET */ 453 case AF_INET6: 454 dst->addr32[0] = src->addr32[0]; 455 dst->addr32[1] = src->addr32[1]; 456 dst->addr32[2] = src->addr32[2]; 457 dst->addr32[3] = src->addr32[3]; 458 break; 459 } 460} 461#endif /* INET6 */ 462 463static void 464pf_init_threshold(struct pf_threshold *threshold, 465 u_int32_t limit, u_int32_t seconds) 466{ 467 threshold->limit = limit * PF_THRESHOLD_MULT; 468 threshold->seconds = seconds; 469 threshold->count = 0; 470 threshold->last = time_uptime; 471} 472 473static void 474pf_add_threshold(struct pf_threshold *threshold) 475{ 476 u_int32_t t = time_uptime, diff = t - threshold->last; 477 478 if (diff >= threshold->seconds) 479 threshold->count = 0; 480 else 481 threshold->count -= threshold->count * diff / 482 threshold->seconds; 483 threshold->count += PF_THRESHOLD_MULT; 484 threshold->last = t; 485} 486 487static int 488pf_check_threshold(struct pf_threshold *threshold) 489{ 490 return (threshold->count > threshold->limit); 491} 492 493static int 494pf_src_connlimit(struct pf_state **state) 495{ 496 struct pf_overload_entry *pfoe; 497 int bad = 0; 498 499 PF_STATE_LOCK_ASSERT(*state); 500 501 (*state)->src_node->conn++; 502 (*state)->src.tcp_est = 1; 503 pf_add_threshold(&(*state)->src_node->conn_rate); 504 505 if ((*state)->rule.ptr->max_src_conn && 506 (*state)->rule.ptr->max_src_conn < 507 (*state)->src_node->conn) { 508 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 509 bad++; 510 } 511 512 if ((*state)->rule.ptr->max_src_conn_rate.limit && 513 pf_check_threshold(&(*state)->src_node->conn_rate)) { 514 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 515 bad++; 516 } 517 518 if (!bad) 519 return (0); 520 521 /* Kill this state. */ 522 (*state)->timeout = PFTM_PURGE; 523 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 524 525 if ((*state)->rule.ptr->overload_tbl == NULL) 526 return (1); 527 528 /* Schedule overloading and flushing task. */ 529 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 530 if (pfoe == NULL) 531 return (1); /* too bad :( */ 532 533 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 534 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 535 pfoe->rule = (*state)->rule.ptr; 536 pfoe->dir = (*state)->direction; 537 PF_OVERLOADQ_LOCK(); 538 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 539 PF_OVERLOADQ_UNLOCK(); 540 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 541 542 return (1); 543} 544 545static void 546pf_overload_task(void *v, int pending) 547{ 548 struct pf_overload_head queue; 549 struct pfr_addr p; 550 struct pf_overload_entry *pfoe, *pfoe1; 551 uint32_t killed = 0; 552 553 CURVNET_SET((struct vnet *)v); 554 555 PF_OVERLOADQ_LOCK(); 556 queue = V_pf_overloadqueue; 557 SLIST_INIT(&V_pf_overloadqueue); 558 PF_OVERLOADQ_UNLOCK(); 559 560 bzero(&p, sizeof(p)); 561 SLIST_FOREACH(pfoe, &queue, next) { 562 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 563 if (V_pf_status.debug >= PF_DEBUG_MISC) { 564 printf("%s: blocking address ", __func__); 565 pf_print_host(&pfoe->addr, 0, pfoe->af); 566 printf("\n"); 567 } 568 569 p.pfra_af = pfoe->af; 570 switch (pfoe->af) { 571#ifdef INET 572 case AF_INET: 573 p.pfra_net = 32; 574 p.pfra_ip4addr = pfoe->addr.v4; 575 break; 576#endif 577#ifdef INET6 578 case AF_INET6: 579 p.pfra_net = 128; 580 p.pfra_ip6addr = pfoe->addr.v6; 581 break; 582#endif 583 } 584 585 PF_RULES_WLOCK(); 586 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 587 PF_RULES_WUNLOCK(); 588 } 589 590 /* 591 * Remove those entries, that don't need flushing. 592 */ 593 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 594 if (pfoe->rule->flush == 0) { 595 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 596 free(pfoe, M_PFTEMP); 597 } else 598 counter_u64_add( 599 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 600 601 /* If nothing to flush, return. */ 602 if (SLIST_EMPTY(&queue)) { 603 CURVNET_RESTORE(); 604 return; 605 } 606 607 for (int i = 0; i <= pf_hashmask; i++) { 608 struct pf_idhash *ih = &V_pf_idhash[i]; 609 struct pf_state_key *sk; 610 struct pf_state *s; 611 612 PF_HASHROW_LOCK(ih); 613 LIST_FOREACH(s, &ih->states, entry) { 614 sk = s->key[PF_SK_WIRE]; 615 SLIST_FOREACH(pfoe, &queue, next) 616 if (sk->af == pfoe->af && 617 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 618 pfoe->rule == s->rule.ptr) && 619 ((pfoe->dir == PF_OUT && 620 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 621 (pfoe->dir == PF_IN && 622 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 623 s->timeout = PFTM_PURGE; 624 s->src.state = s->dst.state = TCPS_CLOSED; 625 killed++; 626 } 627 } 628 PF_HASHROW_UNLOCK(ih); 629 } 630 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 631 free(pfoe, M_PFTEMP); 632 if (V_pf_status.debug >= PF_DEBUG_MISC) 633 printf("%s: %u states killed", __func__, killed); 634 635 CURVNET_RESTORE(); 636} 637 638/* 639 * Can return locked on failure, so that we can consistently 640 * allocate and insert a new one. 641 */ 642struct pf_src_node * 643pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 644 int returnlocked) 645{ 646 struct pf_srchash *sh; 647 struct pf_src_node *n; 648 649 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 650 651 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 652 PF_HASHROW_LOCK(sh); 653 LIST_FOREACH(n, &sh->nodes, entry) 654 if (n->rule.ptr == rule && n->af == af && 655 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 656 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 657 break; 658 if (n != NULL) { 659 n->states++; 660 PF_HASHROW_UNLOCK(sh); 661 } else if (returnlocked == 0) 662 PF_HASHROW_UNLOCK(sh); 663 664 return (n); 665} 666 667static int 668pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 669 struct pf_addr *src, sa_family_t af) 670{ 671 672 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 673 rule->rpool.opts & PF_POOL_STICKYADDR), 674 ("%s for non-tracking rule %p", __func__, rule)); 675 676 if (*sn == NULL) 677 *sn = pf_find_src_node(src, rule, af, 1); 678 679 if (*sn == NULL) { 680 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 681 682 PF_HASHROW_ASSERT(sh); 683 684 if (!rule->max_src_nodes || 685 counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) 686 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 687 else 688 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 689 1); 690 if ((*sn) == NULL) { 691 PF_HASHROW_UNLOCK(sh); 692 return (-1); 693 } 694 695 pf_init_threshold(&(*sn)->conn_rate, 696 rule->max_src_conn_rate.limit, 697 rule->max_src_conn_rate.seconds); 698 699 (*sn)->af = af; 700 (*sn)->rule.ptr = rule; 701 PF_ACPY(&(*sn)->addr, src, af); 702 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 703 (*sn)->creation = time_uptime; 704 (*sn)->ruletype = rule->action; 705 (*sn)->states = 1; 706 if ((*sn)->rule.ptr != NULL) 707 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 708 PF_HASHROW_UNLOCK(sh); 709 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 710 } else { 711 if (rule->max_src_states && 712 (*sn)->states >= rule->max_src_states) { 713 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 714 1); 715 return (-1); 716 } 717 } 718 return (0); 719} 720 721void 722pf_unlink_src_node(struct pf_src_node *src) 723{ 724 725 PF_HASHROW_ASSERT(&V_pf_srchash[pf_hashsrc(&src->addr, src->af)]); 726 LIST_REMOVE(src, entry); 727 if (src->rule.ptr) 728 counter_u64_add(src->rule.ptr->src_nodes, -1); 729} 730 731u_int 732pf_free_src_nodes(struct pf_src_node_list *head) 733{ 734 struct pf_src_node *sn, *tmp; 735 u_int count = 0; 736 737 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 738 uma_zfree(V_pf_sources_z, sn); 739 count++; 740 } 741 742 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count); 743 744 return (count); 745} 746 747void 748pf_mtag_initialize() 749{ 750 751 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 752 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 753 UMA_ALIGN_PTR, 0); 754} 755 756/* Per-vnet data storage structures initialization. */ 757void 758pf_initialize() 759{ 760 struct pf_keyhash *kh; 761 struct pf_idhash *ih; 762 struct pf_srchash *sh; 763 u_int i; 764 765 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &pf_hashsize); 766 if (pf_hashsize == 0 || !powerof2(pf_hashsize)) 767 pf_hashsize = PF_HASHSIZ; 768 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &pf_srchashsize); 769 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) 770 pf_srchashsize = PF_HASHSIZ / 4; 771 772 V_pf_hashseed = arc4random(); 773 774 /* States and state keys storage. */ 775 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 776 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 777 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 778 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 779 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 780 781 V_pf_state_key_z = uma_zcreate("pf state keys", 782 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 783 UMA_ALIGN_PTR, 0); 784 V_pf_keyhash = malloc(pf_hashsize * sizeof(struct pf_keyhash), 785 M_PFHASH, M_WAITOK | M_ZERO); 786 V_pf_idhash = malloc(pf_hashsize * sizeof(struct pf_idhash), 787 M_PFHASH, M_WAITOK | M_ZERO); 788 pf_hashmask = pf_hashsize - 1; 789 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 790 i++, kh++, ih++) { 791 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 792 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 793 } 794 795 /* Source nodes. */ 796 V_pf_sources_z = uma_zcreate("pf source nodes", 797 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 798 0); 799 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 800 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 801 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 802 V_pf_srchash = malloc(pf_srchashsize * sizeof(struct pf_srchash), 803 M_PFHASH, M_WAITOK|M_ZERO); 804 pf_srchashmask = pf_srchashsize - 1; 805 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) 806 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 807 808 /* ALTQ */ 809 TAILQ_INIT(&V_pf_altqs[0]); 810 TAILQ_INIT(&V_pf_altqs[1]); 811 TAILQ_INIT(&V_pf_pabuf); 812 V_pf_altqs_active = &V_pf_altqs[0]; 813 V_pf_altqs_inactive = &V_pf_altqs[1]; 814 815 816 /* Send & overload+flush queues. */ 817 STAILQ_INIT(&V_pf_sendqueue); 818 SLIST_INIT(&V_pf_overloadqueue); 819 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 820 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 821 mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL, 822 MTX_DEF); 823 824 /* Unlinked, but may be referenced rules. */ 825 TAILQ_INIT(&V_pf_unlinked_rules); 826 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 827} 828 829void 830pf_mtag_cleanup() 831{ 832 833 uma_zdestroy(pf_mtag_z); 834} 835 836void 837pf_cleanup() 838{ 839 struct pf_keyhash *kh; 840 struct pf_idhash *ih; 841 struct pf_srchash *sh; 842 struct pf_send_entry *pfse, *next; 843 u_int i; 844 845 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 846 i++, kh++, ih++) { 847 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 848 __func__)); 849 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 850 __func__)); 851 mtx_destroy(&kh->lock); 852 mtx_destroy(&ih->lock); 853 } 854 free(V_pf_keyhash, M_PFHASH); 855 free(V_pf_idhash, M_PFHASH); 856 857 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 858 KASSERT(LIST_EMPTY(&sh->nodes), 859 ("%s: source node hash not empty", __func__)); 860 mtx_destroy(&sh->lock); 861 } 862 free(V_pf_srchash, M_PFHASH); 863 864 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 865 m_freem(pfse->pfse_m); 866 free(pfse, M_PFTEMP); 867 } 868 869 mtx_destroy(&pf_sendqueue_mtx); 870 mtx_destroy(&pf_overloadqueue_mtx); 871 mtx_destroy(&pf_unlnkdrules_mtx); 872 873 uma_zdestroy(V_pf_sources_z); 874 uma_zdestroy(V_pf_state_z); 875 uma_zdestroy(V_pf_state_key_z); 876} 877 878static int 879pf_mtag_uminit(void *mem, int size, int how) 880{ 881 struct m_tag *t; 882 883 t = (struct m_tag *)mem; 884 t->m_tag_cookie = MTAG_ABI_COMPAT; 885 t->m_tag_id = PACKET_TAG_PF; 886 t->m_tag_len = sizeof(struct pf_mtag); 887 t->m_tag_free = pf_mtag_free; 888 889 return (0); 890} 891 892static void 893pf_mtag_free(struct m_tag *t) 894{ 895 896 uma_zfree(pf_mtag_z, t); 897} 898 899struct pf_mtag * 900pf_get_mtag(struct mbuf *m) 901{ 902 struct m_tag *mtag; 903 904 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 905 return ((struct pf_mtag *)(mtag + 1)); 906 907 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 908 if (mtag == NULL) 909 return (NULL); 910 bzero(mtag + 1, sizeof(struct pf_mtag)); 911 m_tag_prepend(m, mtag); 912 913 return ((struct pf_mtag *)(mtag + 1)); 914} 915 916static int 917pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 918 struct pf_state *s) 919{ 920 struct pf_keyhash *khs, *khw, *kh; 921 struct pf_state_key *sk, *cur; 922 struct pf_state *si, *olds = NULL; 923 int idx; 924 925 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 926 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 927 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 928 929 /* 930 * We need to lock hash slots of both keys. To avoid deadlock 931 * we always lock the slot with lower address first. Unlock order 932 * isn't important. 933 * 934 * We also need to lock ID hash slot before dropping key 935 * locks. On success we return with ID hash slot locked. 936 */ 937 938 if (skw == sks) { 939 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 940 PF_HASHROW_LOCK(khs); 941 } else { 942 khs = &V_pf_keyhash[pf_hashkey(sks)]; 943 khw = &V_pf_keyhash[pf_hashkey(skw)]; 944 if (khs == khw) { 945 PF_HASHROW_LOCK(khs); 946 } else if (khs < khw) { 947 PF_HASHROW_LOCK(khs); 948 PF_HASHROW_LOCK(khw); 949 } else { 950 PF_HASHROW_LOCK(khw); 951 PF_HASHROW_LOCK(khs); 952 } 953 } 954 955#define KEYS_UNLOCK() do { \ 956 if (khs != khw) { \ 957 PF_HASHROW_UNLOCK(khs); \ 958 PF_HASHROW_UNLOCK(khw); \ 959 } else \ 960 PF_HASHROW_UNLOCK(khs); \ 961} while (0) 962 963 /* 964 * First run: start with wire key. 965 */ 966 sk = skw; 967 kh = khw; 968 idx = PF_SK_WIRE; 969 970keyattach: 971 LIST_FOREACH(cur, &kh->keys, entry) 972 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 973 break; 974 975 if (cur != NULL) { 976 /* Key exists. Check for same kif, if none, add to key. */ 977 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 978 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 979 980 PF_HASHROW_LOCK(ih); 981 if (si->kif == s->kif && 982 si->direction == s->direction) { 983 if (sk->proto == IPPROTO_TCP && 984 si->src.state >= TCPS_FIN_WAIT_2 && 985 si->dst.state >= TCPS_FIN_WAIT_2) { 986 /* 987 * New state matches an old >FIN_WAIT_2 988 * state. We can't drop key hash locks, 989 * thus we can't unlink it properly. 990 * 991 * As a workaround we drop it into 992 * TCPS_CLOSED state, schedule purge 993 * ASAP and push it into the very end 994 * of the slot TAILQ, so that it won't 995 * conflict with our new state. 996 */ 997 si->src.state = si->dst.state = 998 TCPS_CLOSED; 999 si->timeout = PFTM_PURGE; 1000 olds = si; 1001 } else { 1002 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1003 printf("pf: %s key attach " 1004 "failed on %s: ", 1005 (idx == PF_SK_WIRE) ? 1006 "wire" : "stack", 1007 s->kif->pfik_name); 1008 pf_print_state_parts(s, 1009 (idx == PF_SK_WIRE) ? 1010 sk : NULL, 1011 (idx == PF_SK_STACK) ? 1012 sk : NULL); 1013 printf(", existing: "); 1014 pf_print_state_parts(si, 1015 (idx == PF_SK_WIRE) ? 1016 sk : NULL, 1017 (idx == PF_SK_STACK) ? 1018 sk : NULL); 1019 printf("\n"); 1020 } 1021 PF_HASHROW_UNLOCK(ih); 1022 KEYS_UNLOCK(); 1023 uma_zfree(V_pf_state_key_z, sk); 1024 if (idx == PF_SK_STACK) 1025 pf_detach_state(s); 1026 return (EEXIST); /* collision! */ 1027 } 1028 } 1029 PF_HASHROW_UNLOCK(ih); 1030 } 1031 uma_zfree(V_pf_state_key_z, sk); 1032 s->key[idx] = cur; 1033 } else { 1034 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1035 s->key[idx] = sk; 1036 } 1037 1038stateattach: 1039 /* List is sorted, if-bound states before floating. */ 1040 if (s->kif == V_pfi_all) 1041 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1042 else 1043 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1044 1045 if (olds) { 1046 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1047 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1048 key_list[idx]); 1049 olds = NULL; 1050 } 1051 1052 /* 1053 * Attach done. See how should we (or should not?) 1054 * attach a second key. 1055 */ 1056 if (sks == skw) { 1057 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1058 idx = PF_SK_STACK; 1059 sks = NULL; 1060 goto stateattach; 1061 } else if (sks != NULL) { 1062 /* 1063 * Continue attaching with stack key. 1064 */ 1065 sk = sks; 1066 kh = khs; 1067 idx = PF_SK_STACK; 1068 sks = NULL; 1069 goto keyattach; 1070 } 1071 1072 PF_STATE_LOCK(s); 1073 KEYS_UNLOCK(); 1074 1075 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1076 ("%s failure", __func__)); 1077 1078 return (0); 1079#undef KEYS_UNLOCK 1080} 1081 1082static void 1083pf_detach_state(struct pf_state *s) 1084{ 1085 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1086 struct pf_keyhash *kh; 1087 1088 if (sks != NULL) { 1089 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1090 PF_HASHROW_LOCK(kh); 1091 if (s->key[PF_SK_STACK] != NULL) 1092 pf_state_key_detach(s, PF_SK_STACK); 1093 /* 1094 * If both point to same key, then we are done. 1095 */ 1096 if (sks == s->key[PF_SK_WIRE]) { 1097 pf_state_key_detach(s, PF_SK_WIRE); 1098 PF_HASHROW_UNLOCK(kh); 1099 return; 1100 } 1101 PF_HASHROW_UNLOCK(kh); 1102 } 1103 1104 if (s->key[PF_SK_WIRE] != NULL) { 1105 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1106 PF_HASHROW_LOCK(kh); 1107 if (s->key[PF_SK_WIRE] != NULL) 1108 pf_state_key_detach(s, PF_SK_WIRE); 1109 PF_HASHROW_UNLOCK(kh); 1110 } 1111} 1112 1113static void 1114pf_state_key_detach(struct pf_state *s, int idx) 1115{ 1116 struct pf_state_key *sk = s->key[idx]; 1117#ifdef INVARIANTS 1118 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1119 1120 PF_HASHROW_ASSERT(kh); 1121#endif 1122 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1123 s->key[idx] = NULL; 1124 1125 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1126 LIST_REMOVE(sk, entry); 1127 uma_zfree(V_pf_state_key_z, sk); 1128 } 1129} 1130 1131static int 1132pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1133{ 1134 struct pf_state_key *sk = mem; 1135 1136 bzero(sk, sizeof(struct pf_state_key_cmp)); 1137 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1138 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1139 1140 return (0); 1141} 1142 1143struct pf_state_key * 1144pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1145 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1146{ 1147 struct pf_state_key *sk; 1148 1149 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1150 if (sk == NULL) 1151 return (NULL); 1152 1153 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1154 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1155 sk->port[pd->sidx] = sport; 1156 sk->port[pd->didx] = dport; 1157 sk->proto = pd->proto; 1158 sk->af = pd->af; 1159 1160 return (sk); 1161} 1162 1163struct pf_state_key * 1164pf_state_key_clone(struct pf_state_key *orig) 1165{ 1166 struct pf_state_key *sk; 1167 1168 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1169 if (sk == NULL) 1170 return (NULL); 1171 1172 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1173 1174 return (sk); 1175} 1176 1177int 1178pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1179 struct pf_state_key *sks, struct pf_state *s) 1180{ 1181 struct pf_idhash *ih; 1182 struct pf_state *cur; 1183 int error; 1184 1185 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1186 ("%s: sks not pristine", __func__)); 1187 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1188 ("%s: skw not pristine", __func__)); 1189 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1190 1191 s->kif = kif; 1192 1193 if (s->id == 0 && s->creatorid == 0) { 1194 /* XXX: should be atomic, but probability of collision low */ 1195 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1196 V_pf_stateid[curcpu] = 1; 1197 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1198 s->id = htobe64(s->id); 1199 s->creatorid = V_pf_status.hostid; 1200 } 1201 1202 /* Returns with ID locked on success. */ 1203 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1204 return (error); 1205 1206 ih = &V_pf_idhash[PF_IDHASH(s)]; 1207 PF_HASHROW_ASSERT(ih); 1208 LIST_FOREACH(cur, &ih->states, entry) 1209 if (cur->id == s->id && cur->creatorid == s->creatorid) 1210 break; 1211 1212 if (cur != NULL) { 1213 PF_HASHROW_UNLOCK(ih); 1214 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1215 printf("pf: state ID collision: " 1216 "id: %016llx creatorid: %08x\n", 1217 (unsigned long long)be64toh(s->id), 1218 ntohl(s->creatorid)); 1219 } 1220 pf_detach_state(s); 1221 return (EEXIST); 1222 } 1223 LIST_INSERT_HEAD(&ih->states, s, entry); 1224 /* One for keys, one for ID hash. */ 1225 refcount_init(&s->refs, 2); 1226 1227 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1228 if (pfsync_insert_state_ptr != NULL) 1229 pfsync_insert_state_ptr(s); 1230 1231 /* Returns locked. */ 1232 return (0); 1233} 1234 1235/* 1236 * Find state by ID: returns with locked row on success. 1237 */ 1238struct pf_state * 1239pf_find_state_byid(uint64_t id, uint32_t creatorid) 1240{ 1241 struct pf_idhash *ih; 1242 struct pf_state *s; 1243 1244 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1245 1246 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; 1247 1248 PF_HASHROW_LOCK(ih); 1249 LIST_FOREACH(s, &ih->states, entry) 1250 if (s->id == id && s->creatorid == creatorid) 1251 break; 1252 1253 if (s == NULL) 1254 PF_HASHROW_UNLOCK(ih); 1255 1256 return (s); 1257} 1258 1259/* 1260 * Find state by key. 1261 * Returns with ID hash slot locked on success. 1262 */ 1263static struct pf_state * 1264pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1265{ 1266 struct pf_keyhash *kh; 1267 struct pf_state_key *sk; 1268 struct pf_state *s; 1269 int idx; 1270 1271 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1272 1273 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1274 1275 PF_HASHROW_LOCK(kh); 1276 LIST_FOREACH(sk, &kh->keys, entry) 1277 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1278 break; 1279 if (sk == NULL) { 1280 PF_HASHROW_UNLOCK(kh); 1281 return (NULL); 1282 } 1283 1284 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1285 1286 /* List is sorted, if-bound states before floating ones. */ 1287 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1288 if (s->kif == V_pfi_all || s->kif == kif) { 1289 PF_STATE_LOCK(s); 1290 PF_HASHROW_UNLOCK(kh); 1291 if (s->timeout >= PFTM_MAX) { 1292 /* 1293 * State is either being processed by 1294 * pf_unlink_state() in an other thread, or 1295 * is scheduled for immediate expiry. 1296 */ 1297 PF_STATE_UNLOCK(s); 1298 return (NULL); 1299 } 1300 return (s); 1301 } 1302 PF_HASHROW_UNLOCK(kh); 1303 1304 return (NULL); 1305} 1306 1307struct pf_state * 1308pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1309{ 1310 struct pf_keyhash *kh; 1311 struct pf_state_key *sk; 1312 struct pf_state *s, *ret = NULL; 1313 int idx, inout = 0; 1314 1315 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1316 1317 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1318 1319 PF_HASHROW_LOCK(kh); 1320 LIST_FOREACH(sk, &kh->keys, entry) 1321 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1322 break; 1323 if (sk == NULL) { 1324 PF_HASHROW_UNLOCK(kh); 1325 return (NULL); 1326 } 1327 switch (dir) { 1328 case PF_IN: 1329 idx = PF_SK_WIRE; 1330 break; 1331 case PF_OUT: 1332 idx = PF_SK_STACK; 1333 break; 1334 case PF_INOUT: 1335 idx = PF_SK_WIRE; 1336 inout = 1; 1337 break; 1338 default: 1339 panic("%s: dir %u", __func__, dir); 1340 } 1341second_run: 1342 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1343 if (more == NULL) { 1344 PF_HASHROW_UNLOCK(kh); 1345 return (s); 1346 } 1347 1348 if (ret) 1349 (*more)++; 1350 else 1351 ret = s; 1352 } 1353 if (inout == 1) { 1354 inout = 0; 1355 idx = PF_SK_STACK; 1356 goto second_run; 1357 } 1358 PF_HASHROW_UNLOCK(kh); 1359 1360 return (ret); 1361} 1362 1363/* END state table stuff */ 1364 1365static void 1366pf_send(struct pf_send_entry *pfse) 1367{ 1368 1369 PF_SENDQ_LOCK(); 1370 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1371 PF_SENDQ_UNLOCK(); 1372 swi_sched(V_pf_swi_cookie, 0); 1373} 1374 1375void 1376pf_intr(void *v) 1377{ 1378 struct pf_send_head queue; 1379 struct pf_send_entry *pfse, *next; 1380 1381 CURVNET_SET((struct vnet *)v); 1382 1383 PF_SENDQ_LOCK(); 1384 queue = V_pf_sendqueue; 1385 STAILQ_INIT(&V_pf_sendqueue); 1386 PF_SENDQ_UNLOCK(); 1387 1388 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1389 switch (pfse->pfse_type) { 1390#ifdef INET 1391 case PFSE_IP: 1392 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1393 break; 1394 case PFSE_ICMP: 1395 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1396 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1397 break; 1398#endif /* INET */ 1399#ifdef INET6 1400 case PFSE_IP6: 1401 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1402 NULL); 1403 break; 1404 case PFSE_ICMP6: 1405 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1406 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1407 break; 1408#endif /* INET6 */ 1409 default: 1410 panic("%s: unknown type", __func__); 1411 } 1412 free(pfse, M_PFTEMP); 1413 } 1414 CURVNET_RESTORE(); 1415} 1416 1417void 1418pf_purge_thread(void *v) 1419{ 1420 u_int idx = 0; 1421 1422 CURVNET_SET((struct vnet *)v); 1423 1424 for (;;) { 1425 PF_RULES_RLOCK(); 1426 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1427 1428 if (V_pf_end_threads) { 1429 /* 1430 * To cleanse up all kifs and rules we need 1431 * two runs: first one clears reference flags, 1432 * then pf_purge_expired_states() doesn't 1433 * raise them, and then second run frees. 1434 */ 1435 PF_RULES_RUNLOCK(); 1436 pf_purge_unlinked_rules(); 1437 pfi_kif_purge(); 1438 1439 /* 1440 * Now purge everything. 1441 */ 1442 pf_purge_expired_states(0, pf_hashmask); 1443 pf_purge_expired_fragments(); 1444 pf_purge_expired_src_nodes(); 1445 1446 /* 1447 * Now all kifs & rules should be unreferenced, 1448 * thus should be successfully freed. 1449 */ 1450 pf_purge_unlinked_rules(); 1451 pfi_kif_purge(); 1452 1453 /* 1454 * Announce success and exit. 1455 */ 1456 PF_RULES_RLOCK(); 1457 V_pf_end_threads++; 1458 PF_RULES_RUNLOCK(); 1459 wakeup(pf_purge_thread); 1460 kproc_exit(0); 1461 } 1462 PF_RULES_RUNLOCK(); 1463 1464 /* Process 1/interval fraction of the state table every run. */ 1465 idx = pf_purge_expired_states(idx, pf_hashmask / 1466 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1467 1468 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1469 if (idx == 0) { 1470 /* 1471 * Order is important: 1472 * - states and src nodes reference rules 1473 * - states and rules reference kifs 1474 */ 1475 pf_purge_expired_fragments(); 1476 pf_purge_expired_src_nodes(); 1477 pf_purge_unlinked_rules(); 1478 pfi_kif_purge(); 1479 } 1480 } 1481 /* not reached */ 1482 CURVNET_RESTORE(); 1483} 1484 1485u_int32_t 1486pf_state_expires(const struct pf_state *state) 1487{ 1488 u_int32_t timeout; 1489 u_int32_t start; 1490 u_int32_t end; 1491 u_int32_t states; 1492 1493 /* handle all PFTM_* > PFTM_MAX here */ 1494 if (state->timeout == PFTM_PURGE) 1495 return (time_uptime); 1496 KASSERT(state->timeout != PFTM_UNLINKED, 1497 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1498 KASSERT((state->timeout < PFTM_MAX), 1499 ("pf_state_expires: timeout > PFTM_MAX")); 1500 timeout = state->rule.ptr->timeout[state->timeout]; 1501 if (!timeout) 1502 timeout = V_pf_default_rule.timeout[state->timeout]; 1503 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1504 if (start) { 1505 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1506 states = counter_u64_fetch(state->rule.ptr->states_cur); 1507 } else { 1508 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1509 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1510 states = V_pf_status.states; 1511 } 1512 if (end && states > start && start < end) { 1513 if (states < end) 1514 return (state->expire + timeout * (end - states) / 1515 (end - start)); 1516 else 1517 return (time_uptime); 1518 } 1519 return (state->expire + timeout); 1520} 1521 1522void 1523pf_purge_expired_src_nodes() 1524{ 1525 struct pf_src_node_list freelist; 1526 struct pf_srchash *sh; 1527 struct pf_src_node *cur, *next; 1528 int i; 1529 1530 LIST_INIT(&freelist); 1531 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1532 PF_HASHROW_LOCK(sh); 1533 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1534 if (cur->states == 0 && cur->expire <= time_uptime) { 1535 pf_unlink_src_node(cur); 1536 LIST_INSERT_HEAD(&freelist, cur, entry); 1537 } else if (cur->rule.ptr != NULL) 1538 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1539 PF_HASHROW_UNLOCK(sh); 1540 } 1541 1542 pf_free_src_nodes(&freelist); 1543 1544 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 1545} 1546 1547static void 1548pf_src_tree_remove_state(struct pf_state *s) 1549{ 1550 struct pf_src_node *sn; 1551 struct pf_srchash *sh; 1552 uint32_t timeout; 1553 1554 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ? 1555 s->rule.ptr->timeout[PFTM_SRC_NODE] : 1556 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1557 1558 if (s->src_node != NULL) { 1559 sn = s->src_node; 1560 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1561 PF_HASHROW_LOCK(sh); 1562 if (s->src.tcp_est) 1563 --sn->conn; 1564 if (--sn->states == 0) 1565 sn->expire = time_uptime + timeout; 1566 PF_HASHROW_UNLOCK(sh); 1567 } 1568 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1569 sn = s->nat_src_node; 1570 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1571 PF_HASHROW_LOCK(sh); 1572 if (--sn->states == 0) 1573 sn->expire = time_uptime + timeout; 1574 PF_HASHROW_UNLOCK(sh); 1575 } 1576 s->src_node = s->nat_src_node = NULL; 1577} 1578 1579/* 1580 * Unlink and potentilly free a state. Function may be 1581 * called with ID hash row locked, but always returns 1582 * unlocked, since it needs to go through key hash locking. 1583 */ 1584int 1585pf_unlink_state(struct pf_state *s, u_int flags) 1586{ 1587 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1588 1589 if ((flags & PF_ENTER_LOCKED) == 0) 1590 PF_HASHROW_LOCK(ih); 1591 else 1592 PF_HASHROW_ASSERT(ih); 1593 1594 if (s->timeout == PFTM_UNLINKED) { 1595 /* 1596 * State is being processed 1597 * by pf_unlink_state() in 1598 * an other thread. 1599 */ 1600 PF_HASHROW_UNLOCK(ih); 1601 return (0); /* XXXGL: undefined actually */ 1602 } 1603 1604 if (s->src.state == PF_TCPS_PROXY_DST) { 1605 /* XXX wire key the right one? */ 1606 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1607 &s->key[PF_SK_WIRE]->addr[1], 1608 &s->key[PF_SK_WIRE]->addr[0], 1609 s->key[PF_SK_WIRE]->port[1], 1610 s->key[PF_SK_WIRE]->port[0], 1611 s->src.seqhi, s->src.seqlo + 1, 1612 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1613 } 1614 1615 LIST_REMOVE(s, entry); 1616 pf_src_tree_remove_state(s); 1617 1618 if (pfsync_delete_state_ptr != NULL) 1619 pfsync_delete_state_ptr(s); 1620 1621 STATE_DEC_COUNTERS(s); 1622 1623 s->timeout = PFTM_UNLINKED; 1624 1625 PF_HASHROW_UNLOCK(ih); 1626 1627 pf_detach_state(s); 1628 refcount_release(&s->refs); 1629 1630 return (pf_release_state(s)); 1631} 1632 1633void 1634pf_free_state(struct pf_state *cur) 1635{ 1636 1637 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1638 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1639 cur->timeout)); 1640 1641 pf_normalize_tcp_cleanup(cur); 1642 uma_zfree(V_pf_state_z, cur); 1643 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 1644} 1645 1646/* 1647 * Called only from pf_purge_thread(), thus serialized. 1648 */ 1649static u_int 1650pf_purge_expired_states(u_int i, int maxcheck) 1651{ 1652 struct pf_idhash *ih; 1653 struct pf_state *s; 1654 1655 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1656 1657 /* 1658 * Go through hash and unlink states that expire now. 1659 */ 1660 while (maxcheck > 0) { 1661 1662 ih = &V_pf_idhash[i]; 1663relock: 1664 PF_HASHROW_LOCK(ih); 1665 LIST_FOREACH(s, &ih->states, entry) { 1666 if (pf_state_expires(s) <= time_uptime) { 1667 V_pf_status.states -= 1668 pf_unlink_state(s, PF_ENTER_LOCKED); 1669 goto relock; 1670 } 1671 s->rule.ptr->rule_flag |= PFRULE_REFS; 1672 if (s->nat_rule.ptr != NULL) 1673 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1674 if (s->anchor.ptr != NULL) 1675 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1676 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1677 if (s->rt_kif) 1678 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1679 } 1680 PF_HASHROW_UNLOCK(ih); 1681 1682 /* Return when we hit end of hash. */ 1683 if (++i > pf_hashmask) { 1684 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1685 return (0); 1686 } 1687 1688 maxcheck--; 1689 } 1690 1691 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1692 1693 return (i); 1694} 1695 1696static void 1697pf_purge_unlinked_rules() 1698{ 1699 struct pf_rulequeue tmpq; 1700 struct pf_rule *r, *r1; 1701 1702 /* 1703 * If we have overloading task pending, then we'd 1704 * better skip purging this time. There is a tiny 1705 * probability that overloading task references 1706 * an already unlinked rule. 1707 */ 1708 PF_OVERLOADQ_LOCK(); 1709 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 1710 PF_OVERLOADQ_UNLOCK(); 1711 return; 1712 } 1713 PF_OVERLOADQ_UNLOCK(); 1714 1715 /* 1716 * Do naive mark-and-sweep garbage collecting of old rules. 1717 * Reference flag is raised by pf_purge_expired_states() 1718 * and pf_purge_expired_src_nodes(). 1719 * 1720 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1721 * use a temporary queue. 1722 */ 1723 TAILQ_INIT(&tmpq); 1724 PF_UNLNKDRULES_LOCK(); 1725 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1726 if (!(r->rule_flag & PFRULE_REFS)) { 1727 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1728 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1729 } else 1730 r->rule_flag &= ~PFRULE_REFS; 1731 } 1732 PF_UNLNKDRULES_UNLOCK(); 1733 1734 if (!TAILQ_EMPTY(&tmpq)) { 1735 PF_RULES_WLOCK(); 1736 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1737 TAILQ_REMOVE(&tmpq, r, entries); 1738 pf_free_rule(r); 1739 } 1740 PF_RULES_WUNLOCK(); 1741 } 1742} 1743 1744void 1745pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1746{ 1747 switch (af) { 1748#ifdef INET 1749 case AF_INET: { 1750 u_int32_t a = ntohl(addr->addr32[0]); 1751 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1752 (a>>8)&255, a&255); 1753 if (p) { 1754 p = ntohs(p); 1755 printf(":%u", p); 1756 } 1757 break; 1758 } 1759#endif /* INET */ 1760#ifdef INET6 1761 case AF_INET6: { 1762 u_int16_t b; 1763 u_int8_t i, curstart, curend, maxstart, maxend; 1764 curstart = curend = maxstart = maxend = 255; 1765 for (i = 0; i < 8; i++) { 1766 if (!addr->addr16[i]) { 1767 if (curstart == 255) 1768 curstart = i; 1769 curend = i; 1770 } else { 1771 if ((curend - curstart) > 1772 (maxend - maxstart)) { 1773 maxstart = curstart; 1774 maxend = curend; 1775 } 1776 curstart = curend = 255; 1777 } 1778 } 1779 if ((curend - curstart) > 1780 (maxend - maxstart)) { 1781 maxstart = curstart; 1782 maxend = curend; 1783 } 1784 for (i = 0; i < 8; i++) { 1785 if (i >= maxstart && i <= maxend) { 1786 if (i == 0) 1787 printf(":"); 1788 if (i == maxend) 1789 printf(":"); 1790 } else { 1791 b = ntohs(addr->addr16[i]); 1792 printf("%x", b); 1793 if (i < 7) 1794 printf(":"); 1795 } 1796 } 1797 if (p) { 1798 p = ntohs(p); 1799 printf("[%u]", p); 1800 } 1801 break; 1802 } 1803#endif /* INET6 */ 1804 } 1805} 1806 1807void 1808pf_print_state(struct pf_state *s) 1809{ 1810 pf_print_state_parts(s, NULL, NULL); 1811} 1812 1813static void 1814pf_print_state_parts(struct pf_state *s, 1815 struct pf_state_key *skwp, struct pf_state_key *sksp) 1816{ 1817 struct pf_state_key *skw, *sks; 1818 u_int8_t proto, dir; 1819 1820 /* Do our best to fill these, but they're skipped if NULL */ 1821 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1822 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1823 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1824 dir = s ? s->direction : 0; 1825 1826 switch (proto) { 1827 case IPPROTO_IPV4: 1828 printf("IPv4"); 1829 break; 1830 case IPPROTO_IPV6: 1831 printf("IPv6"); 1832 break; 1833 case IPPROTO_TCP: 1834 printf("TCP"); 1835 break; 1836 case IPPROTO_UDP: 1837 printf("UDP"); 1838 break; 1839 case IPPROTO_ICMP: 1840 printf("ICMP"); 1841 break; 1842 case IPPROTO_ICMPV6: 1843 printf("ICMPv6"); 1844 break; 1845 default: 1846 printf("%u", skw->proto); 1847 break; 1848 } 1849 switch (dir) { 1850 case PF_IN: 1851 printf(" in"); 1852 break; 1853 case PF_OUT: 1854 printf(" out"); 1855 break; 1856 } 1857 if (skw) { 1858 printf(" wire: "); 1859 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1860 printf(" "); 1861 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1862 } 1863 if (sks) { 1864 printf(" stack: "); 1865 if (sks != skw) { 1866 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1867 printf(" "); 1868 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1869 } else 1870 printf("-"); 1871 } 1872 if (s) { 1873 if (proto == IPPROTO_TCP) { 1874 printf(" [lo=%u high=%u win=%u modulator=%u", 1875 s->src.seqlo, s->src.seqhi, 1876 s->src.max_win, s->src.seqdiff); 1877 if (s->src.wscale && s->dst.wscale) 1878 printf(" wscale=%u", 1879 s->src.wscale & PF_WSCALE_MASK); 1880 printf("]"); 1881 printf(" [lo=%u high=%u win=%u modulator=%u", 1882 s->dst.seqlo, s->dst.seqhi, 1883 s->dst.max_win, s->dst.seqdiff); 1884 if (s->src.wscale && s->dst.wscale) 1885 printf(" wscale=%u", 1886 s->dst.wscale & PF_WSCALE_MASK); 1887 printf("]"); 1888 } 1889 printf(" %u:%u", s->src.state, s->dst.state); 1890 } 1891} 1892 1893void 1894pf_print_flags(u_int8_t f) 1895{ 1896 if (f) 1897 printf(" "); 1898 if (f & TH_FIN) 1899 printf("F"); 1900 if (f & TH_SYN) 1901 printf("S"); 1902 if (f & TH_RST) 1903 printf("R"); 1904 if (f & TH_PUSH) 1905 printf("P"); 1906 if (f & TH_ACK) 1907 printf("A"); 1908 if (f & TH_URG) 1909 printf("U"); 1910 if (f & TH_ECE) 1911 printf("E"); 1912 if (f & TH_CWR) 1913 printf("W"); 1914} 1915 1916#define PF_SET_SKIP_STEPS(i) \ 1917 do { \ 1918 while (head[i] != cur) { \ 1919 head[i]->skip[i].ptr = cur; \ 1920 head[i] = TAILQ_NEXT(head[i], entries); \ 1921 } \ 1922 } while (0) 1923 1924void 1925pf_calc_skip_steps(struct pf_rulequeue *rules) 1926{ 1927 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1928 int i; 1929 1930 cur = TAILQ_FIRST(rules); 1931 prev = cur; 1932 for (i = 0; i < PF_SKIP_COUNT; ++i) 1933 head[i] = cur; 1934 while (cur != NULL) { 1935 1936 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1937 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1938 if (cur->direction != prev->direction) 1939 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1940 if (cur->af != prev->af) 1941 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1942 if (cur->proto != prev->proto) 1943 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1944 if (cur->src.neg != prev->src.neg || 1945 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1946 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1947 if (cur->src.port[0] != prev->src.port[0] || 1948 cur->src.port[1] != prev->src.port[1] || 1949 cur->src.port_op != prev->src.port_op) 1950 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1951 if (cur->dst.neg != prev->dst.neg || 1952 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1953 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1954 if (cur->dst.port[0] != prev->dst.port[0] || 1955 cur->dst.port[1] != prev->dst.port[1] || 1956 cur->dst.port_op != prev->dst.port_op) 1957 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1958 1959 prev = cur; 1960 cur = TAILQ_NEXT(cur, entries); 1961 } 1962 for (i = 0; i < PF_SKIP_COUNT; ++i) 1963 PF_SET_SKIP_STEPS(i); 1964} 1965 1966static int 1967pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1968{ 1969 if (aw1->type != aw2->type) 1970 return (1); 1971 switch (aw1->type) { 1972 case PF_ADDR_ADDRMASK: 1973 case PF_ADDR_RANGE: 1974 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1975 return (1); 1976 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1977 return (1); 1978 return (0); 1979 case PF_ADDR_DYNIFTL: 1980 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1981 case PF_ADDR_NOROUTE: 1982 case PF_ADDR_URPFFAILED: 1983 return (0); 1984 case PF_ADDR_TABLE: 1985 return (aw1->p.tbl != aw2->p.tbl); 1986 default: 1987 printf("invalid address type: %d\n", aw1->type); 1988 return (1); 1989 } 1990} 1991 1992/** 1993 * Checksum updates are a little complicated because the checksum in the TCP/UDP 1994 * header isn't always a full checksum. In some cases (i.e. output) it's a 1995 * pseudo-header checksum, which is a partial checksum over src/dst IP 1996 * addresses, protocol number and length. 1997 * 1998 * That means we have the following cases: 1999 * * Input or forwarding: we don't have TSO, the checksum fields are full 2000 * checksums, we need to update the checksum whenever we change anything. 2001 * * Output (i.e. the checksum is a pseudo-header checksum): 2002 * x The field being updated is src/dst address or affects the length of 2003 * the packet. We need to update the pseudo-header checksum (note that this 2004 * checksum is not ones' complement). 2005 * x Some other field is being modified (e.g. src/dst port numbers): We 2006 * don't have to update anything. 2007 **/ 2008u_int16_t 2009pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2010{ 2011 u_int32_t l; 2012 2013 if (udp && !cksum) 2014 return (0x0000); 2015 l = cksum + old - new; 2016 l = (l >> 16) + (l & 65535); 2017 l = l & 65535; 2018 if (udp && !l) 2019 return (0xFFFF); 2020 return (l); 2021} 2022 2023u_int16_t 2024pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old, 2025 u_int16_t new, u_int8_t udp) 2026{ 2027 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2028 return (cksum); 2029 2030 return (pf_cksum_fixup(cksum, old, new, udp)); 2031} 2032 2033static void 2034pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic, 2035 u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, 2036 sa_family_t af) 2037{ 2038 struct pf_addr ao; 2039 u_int16_t po = *p; 2040 2041 PF_ACPY(&ao, a, af); 2042 PF_ACPY(a, an, af); 2043 2044 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2045 *pc = ~*pc; 2046 2047 *p = pn; 2048 2049 switch (af) { 2050#ifdef INET 2051 case AF_INET: 2052 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2053 ao.addr16[0], an->addr16[0], 0), 2054 ao.addr16[1], an->addr16[1], 0); 2055 *p = pn; 2056 2057 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc, 2058 ao.addr16[0], an->addr16[0], u), 2059 ao.addr16[1], an->addr16[1], u); 2060 2061 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2062 break; 2063#endif /* INET */ 2064#ifdef INET6 2065 case AF_INET6: 2066 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2067 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2068 pf_cksum_fixup(pf_cksum_fixup(*pc, 2069 ao.addr16[0], an->addr16[0], u), 2070 ao.addr16[1], an->addr16[1], u), 2071 ao.addr16[2], an->addr16[2], u), 2072 ao.addr16[3], an->addr16[3], u), 2073 ao.addr16[4], an->addr16[4], u), 2074 ao.addr16[5], an->addr16[5], u), 2075 ao.addr16[6], an->addr16[6], u), 2076 ao.addr16[7], an->addr16[7], u); 2077 2078 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2079 break; 2080#endif /* INET6 */ 2081 } 2082 2083 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | 2084 CSUM_DELAY_DATA_IPV6)) { 2085 *pc = ~*pc; 2086 if (! *pc) 2087 *pc = 0xffff; 2088 } 2089} 2090 2091/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2092void 2093pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2094{ 2095 u_int32_t ao; 2096 2097 memcpy(&ao, a, sizeof(ao)); 2098 memcpy(a, &an, sizeof(u_int32_t)); 2099 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2100 ao % 65536, an % 65536, u); 2101} 2102 2103void 2104pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp) 2105{ 2106 u_int32_t ao; 2107 2108 memcpy(&ao, a, sizeof(ao)); 2109 memcpy(a, &an, sizeof(u_int32_t)); 2110 2111 *c = pf_proto_cksum_fixup(m, 2112 pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp), 2113 ao % 65536, an % 65536, udp); 2114} 2115 2116#ifdef INET6 2117static void 2118pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2119{ 2120 struct pf_addr ao; 2121 2122 PF_ACPY(&ao, a, AF_INET6); 2123 PF_ACPY(a, an, AF_INET6); 2124 2125 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2126 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2127 pf_cksum_fixup(pf_cksum_fixup(*c, 2128 ao.addr16[0], an->addr16[0], u), 2129 ao.addr16[1], an->addr16[1], u), 2130 ao.addr16[2], an->addr16[2], u), 2131 ao.addr16[3], an->addr16[3], u), 2132 ao.addr16[4], an->addr16[4], u), 2133 ao.addr16[5], an->addr16[5], u), 2134 ao.addr16[6], an->addr16[6], u), 2135 ao.addr16[7], an->addr16[7], u); 2136} 2137#endif /* INET6 */ 2138 2139static void 2140pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2141 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2142 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2143{ 2144 struct pf_addr oia, ooa; 2145 2146 PF_ACPY(&oia, ia, af); 2147 if (oa) 2148 PF_ACPY(&ooa, oa, af); 2149 2150 /* Change inner protocol port, fix inner protocol checksum. */ 2151 if (ip != NULL) { 2152 u_int16_t oip = *ip; 2153 u_int32_t opc; 2154 2155 if (pc != NULL) 2156 opc = *pc; 2157 *ip = np; 2158 if (pc != NULL) 2159 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2160 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2161 if (pc != NULL) 2162 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2163 } 2164 /* Change inner ip address, fix inner ip and icmp checksums. */ 2165 PF_ACPY(ia, na, af); 2166 switch (af) { 2167#ifdef INET 2168 case AF_INET: { 2169 u_int32_t oh2c = *h2c; 2170 2171 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2172 oia.addr16[0], ia->addr16[0], 0), 2173 oia.addr16[1], ia->addr16[1], 0); 2174 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2175 oia.addr16[0], ia->addr16[0], 0), 2176 oia.addr16[1], ia->addr16[1], 0); 2177 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2178 break; 2179 } 2180#endif /* INET */ 2181#ifdef INET6 2182 case AF_INET6: 2183 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2184 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2185 pf_cksum_fixup(pf_cksum_fixup(*ic, 2186 oia.addr16[0], ia->addr16[0], u), 2187 oia.addr16[1], ia->addr16[1], u), 2188 oia.addr16[2], ia->addr16[2], u), 2189 oia.addr16[3], ia->addr16[3], u), 2190 oia.addr16[4], ia->addr16[4], u), 2191 oia.addr16[5], ia->addr16[5], u), 2192 oia.addr16[6], ia->addr16[6], u), 2193 oia.addr16[7], ia->addr16[7], u); 2194 break; 2195#endif /* INET6 */ 2196 } 2197 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2198 if (oa) { 2199 PF_ACPY(oa, na, af); 2200 switch (af) { 2201#ifdef INET 2202 case AF_INET: 2203 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2204 ooa.addr16[0], oa->addr16[0], 0), 2205 ooa.addr16[1], oa->addr16[1], 0); 2206 break; 2207#endif /* INET */ 2208#ifdef INET6 2209 case AF_INET6: 2210 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2211 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2212 pf_cksum_fixup(pf_cksum_fixup(*ic, 2213 ooa.addr16[0], oa->addr16[0], u), 2214 ooa.addr16[1], oa->addr16[1], u), 2215 ooa.addr16[2], oa->addr16[2], u), 2216 ooa.addr16[3], oa->addr16[3], u), 2217 ooa.addr16[4], oa->addr16[4], u), 2218 ooa.addr16[5], oa->addr16[5], u), 2219 ooa.addr16[6], oa->addr16[6], u), 2220 ooa.addr16[7], oa->addr16[7], u); 2221 break; 2222#endif /* INET6 */ 2223 } 2224 } 2225} 2226 2227 2228/* 2229 * Need to modulate the sequence numbers in the TCP SACK option 2230 * (credits to Krzysztof Pfaff for report and patch) 2231 */ 2232static int 2233pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2234 struct tcphdr *th, struct pf_state_peer *dst) 2235{ 2236 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2237 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2238 int copyback = 0, i, olen; 2239 struct sackblk sack; 2240 2241#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2242 if (hlen < TCPOLEN_SACKLEN || 2243 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2244 return 0; 2245 2246 while (hlen >= TCPOLEN_SACKLEN) { 2247 olen = opt[1]; 2248 switch (*opt) { 2249 case TCPOPT_EOL: /* FALLTHROUGH */ 2250 case TCPOPT_NOP: 2251 opt++; 2252 hlen--; 2253 break; 2254 case TCPOPT_SACK: 2255 if (olen > hlen) 2256 olen = hlen; 2257 if (olen >= TCPOLEN_SACKLEN) { 2258 for (i = 2; i + TCPOLEN_SACK <= olen; 2259 i += TCPOLEN_SACK) { 2260 memcpy(&sack, &opt[i], sizeof(sack)); 2261 pf_change_proto_a(m, &sack.start, &th->th_sum, 2262 htonl(ntohl(sack.start) - dst->seqdiff), 0); 2263 pf_change_proto_a(m, &sack.end, &th->th_sum, 2264 htonl(ntohl(sack.end) - dst->seqdiff), 0); 2265 memcpy(&opt[i], &sack, sizeof(sack)); 2266 } 2267 copyback = 1; 2268 } 2269 /* FALLTHROUGH */ 2270 default: 2271 if (olen < 2) 2272 olen = 2; 2273 hlen -= olen; 2274 opt += olen; 2275 } 2276 } 2277 2278 if (copyback) 2279 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2280 return (copyback); 2281} 2282 2283static void 2284pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2285 const struct pf_addr *saddr, const struct pf_addr *daddr, 2286 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2287 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2288 u_int16_t rtag, struct ifnet *ifp) 2289{ 2290 struct pf_send_entry *pfse; 2291 struct mbuf *m; 2292 int len, tlen; 2293#ifdef INET 2294 struct ip *h = NULL; 2295#endif /* INET */ 2296#ifdef INET6 2297 struct ip6_hdr *h6 = NULL; 2298#endif /* INET6 */ 2299 struct tcphdr *th; 2300 char *opt; 2301 struct pf_mtag *pf_mtag; 2302 2303 len = 0; 2304 th = NULL; 2305 2306 /* maximum segment size tcp option */ 2307 tlen = sizeof(struct tcphdr); 2308 if (mss) 2309 tlen += 4; 2310 2311 switch (af) { 2312#ifdef INET 2313 case AF_INET: 2314 len = sizeof(struct ip) + tlen; 2315 break; 2316#endif /* INET */ 2317#ifdef INET6 2318 case AF_INET6: 2319 len = sizeof(struct ip6_hdr) + tlen; 2320 break; 2321#endif /* INET6 */ 2322 default: 2323 panic("%s: unsupported af %d", __func__, af); 2324 } 2325 2326 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2327 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2328 if (pfse == NULL) 2329 return; 2330 m = m_gethdr(M_NOWAIT, MT_DATA); 2331 if (m == NULL) { 2332 free(pfse, M_PFTEMP); 2333 return; 2334 } 2335#ifdef MAC 2336 mac_netinet_firewall_send(m); 2337#endif 2338 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2339 free(pfse, M_PFTEMP); 2340 m_freem(m); 2341 return; 2342 } 2343 if (tag) 2344 m->m_flags |= M_SKIP_FIREWALL; 2345 pf_mtag->tag = rtag; 2346 2347 if (r != NULL && r->rtableid >= 0) 2348 M_SETFIB(m, r->rtableid); 2349 2350#ifdef ALTQ 2351 if (r != NULL && r->qid) { 2352 pf_mtag->qid = r->qid; 2353 2354 /* add hints for ecn */ 2355 pf_mtag->hdr = mtod(m, struct ip *); 2356 } 2357#endif /* ALTQ */ 2358 m->m_data += max_linkhdr; 2359 m->m_pkthdr.len = m->m_len = len; 2360 m->m_pkthdr.rcvif = NULL; 2361 bzero(m->m_data, len); 2362 switch (af) { 2363#ifdef INET 2364 case AF_INET: 2365 h = mtod(m, struct ip *); 2366 2367 /* IP header fields included in the TCP checksum */ 2368 h->ip_p = IPPROTO_TCP; 2369 h->ip_len = htons(tlen); 2370 h->ip_src.s_addr = saddr->v4.s_addr; 2371 h->ip_dst.s_addr = daddr->v4.s_addr; 2372 2373 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2374 break; 2375#endif /* INET */ 2376#ifdef INET6 2377 case AF_INET6: 2378 h6 = mtod(m, struct ip6_hdr *); 2379 2380 /* IP header fields included in the TCP checksum */ 2381 h6->ip6_nxt = IPPROTO_TCP; 2382 h6->ip6_plen = htons(tlen); 2383 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2384 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2385 2386 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2387 break; 2388#endif /* INET6 */ 2389 } 2390 2391 /* TCP header */ 2392 th->th_sport = sport; 2393 th->th_dport = dport; 2394 th->th_seq = htonl(seq); 2395 th->th_ack = htonl(ack); 2396 th->th_off = tlen >> 2; 2397 th->th_flags = flags; 2398 th->th_win = htons(win); 2399 2400 if (mss) { 2401 opt = (char *)(th + 1); 2402 opt[0] = TCPOPT_MAXSEG; 2403 opt[1] = 4; 2404 HTONS(mss); 2405 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2406 } 2407 2408 switch (af) { 2409#ifdef INET 2410 case AF_INET: 2411 /* TCP checksum */ 2412 th->th_sum = in_cksum(m, len); 2413 2414 /* Finish the IP header */ 2415 h->ip_v = 4; 2416 h->ip_hl = sizeof(*h) >> 2; 2417 h->ip_tos = IPTOS_LOWDELAY; 2418 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2419 h->ip_len = htons(len); 2420 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2421 h->ip_sum = 0; 2422 2423 pfse->pfse_type = PFSE_IP; 2424 break; 2425#endif /* INET */ 2426#ifdef INET6 2427 case AF_INET6: 2428 /* TCP checksum */ 2429 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2430 sizeof(struct ip6_hdr), tlen); 2431 2432 h6->ip6_vfc |= IPV6_VERSION; 2433 h6->ip6_hlim = IPV6_DEFHLIM; 2434 2435 pfse->pfse_type = PFSE_IP6; 2436 break; 2437#endif /* INET6 */ 2438 } 2439 pfse->pfse_m = m; 2440 pf_send(pfse); 2441} 2442 2443static void 2444pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2445 struct pf_rule *r) 2446{ 2447 struct pf_send_entry *pfse; 2448 struct mbuf *m0; 2449 struct pf_mtag *pf_mtag; 2450 2451 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2452 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2453 if (pfse == NULL) 2454 return; 2455 2456 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2457 free(pfse, M_PFTEMP); 2458 return; 2459 } 2460 2461 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2462 free(pfse, M_PFTEMP); 2463 return; 2464 } 2465 /* XXX: revisit */ 2466 m0->m_flags |= M_SKIP_FIREWALL; 2467 2468 if (r->rtableid >= 0) 2469 M_SETFIB(m0, r->rtableid); 2470 2471#ifdef ALTQ 2472 if (r->qid) { 2473 pf_mtag->qid = r->qid; 2474 /* add hints for ecn */ 2475 pf_mtag->hdr = mtod(m0, struct ip *); 2476 } 2477#endif /* ALTQ */ 2478 2479 switch (af) { 2480#ifdef INET 2481 case AF_INET: 2482 pfse->pfse_type = PFSE_ICMP; 2483 break; 2484#endif /* INET */ 2485#ifdef INET6 2486 case AF_INET6: 2487 pfse->pfse_type = PFSE_ICMP6; 2488 break; 2489#endif /* INET6 */ 2490 } 2491 pfse->pfse_m = m0; 2492 pfse->pfse_icmp_type = type; 2493 pfse->pfse_icmp_code = code; 2494 pf_send(pfse); 2495} 2496 2497/* 2498 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2499 * If n is 0, they match if they are equal. If n is != 0, they match if they 2500 * are different. 2501 */ 2502int 2503pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2504 struct pf_addr *b, sa_family_t af) 2505{ 2506 int match = 0; 2507 2508 switch (af) { 2509#ifdef INET 2510 case AF_INET: 2511 if ((a->addr32[0] & m->addr32[0]) == 2512 (b->addr32[0] & m->addr32[0])) 2513 match++; 2514 break; 2515#endif /* INET */ 2516#ifdef INET6 2517 case AF_INET6: 2518 if (((a->addr32[0] & m->addr32[0]) == 2519 (b->addr32[0] & m->addr32[0])) && 2520 ((a->addr32[1] & m->addr32[1]) == 2521 (b->addr32[1] & m->addr32[1])) && 2522 ((a->addr32[2] & m->addr32[2]) == 2523 (b->addr32[2] & m->addr32[2])) && 2524 ((a->addr32[3] & m->addr32[3]) == 2525 (b->addr32[3] & m->addr32[3]))) 2526 match++; 2527 break; 2528#endif /* INET6 */ 2529 } 2530 if (match) { 2531 if (n) 2532 return (0); 2533 else 2534 return (1); 2535 } else { 2536 if (n) 2537 return (1); 2538 else 2539 return (0); 2540 } 2541} 2542 2543/* 2544 * Return 1 if b <= a <= e, otherwise return 0. 2545 */ 2546int 2547pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2548 struct pf_addr *a, sa_family_t af) 2549{ 2550 switch (af) { 2551#ifdef INET 2552 case AF_INET: 2553 if ((a->addr32[0] < b->addr32[0]) || 2554 (a->addr32[0] > e->addr32[0])) 2555 return (0); 2556 break; 2557#endif /* INET */ 2558#ifdef INET6 2559 case AF_INET6: { 2560 int i; 2561 2562 /* check a >= b */ 2563 for (i = 0; i < 4; ++i) 2564 if (a->addr32[i] > b->addr32[i]) 2565 break; 2566 else if (a->addr32[i] < b->addr32[i]) 2567 return (0); 2568 /* check a <= e */ 2569 for (i = 0; i < 4; ++i) 2570 if (a->addr32[i] < e->addr32[i]) 2571 break; 2572 else if (a->addr32[i] > e->addr32[i]) 2573 return (0); 2574 break; 2575 } 2576#endif /* INET6 */ 2577 } 2578 return (1); 2579} 2580 2581static int 2582pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2583{ 2584 switch (op) { 2585 case PF_OP_IRG: 2586 return ((p > a1) && (p < a2)); 2587 case PF_OP_XRG: 2588 return ((p < a1) || (p > a2)); 2589 case PF_OP_RRG: 2590 return ((p >= a1) && (p <= a2)); 2591 case PF_OP_EQ: 2592 return (p == a1); 2593 case PF_OP_NE: 2594 return (p != a1); 2595 case PF_OP_LT: 2596 return (p < a1); 2597 case PF_OP_LE: 2598 return (p <= a1); 2599 case PF_OP_GT: 2600 return (p > a1); 2601 case PF_OP_GE: 2602 return (p >= a1); 2603 } 2604 return (0); /* never reached */ 2605} 2606 2607int 2608pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2609{ 2610 NTOHS(a1); 2611 NTOHS(a2); 2612 NTOHS(p); 2613 return (pf_match(op, a1, a2, p)); 2614} 2615 2616static int 2617pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2618{ 2619 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2620 return (0); 2621 return (pf_match(op, a1, a2, u)); 2622} 2623 2624static int 2625pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2626{ 2627 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2628 return (0); 2629 return (pf_match(op, a1, a2, g)); 2630} 2631 2632int 2633pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2634{ 2635 if (*tag == -1) 2636 *tag = mtag; 2637 2638 return ((!r->match_tag_not && r->match_tag == *tag) || 2639 (r->match_tag_not && r->match_tag != *tag)); 2640} 2641 2642int 2643pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2644{ 2645 2646 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2647 2648 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2649 return (ENOMEM); 2650 2651 pd->pf_mtag->tag = tag; 2652 2653 return (0); 2654} 2655 2656#define PF_ANCHOR_STACKSIZE 32 2657struct pf_anchor_stackframe { 2658 struct pf_ruleset *rs; 2659 struct pf_rule *r; /* XXX: + match bit */ 2660 struct pf_anchor *child; 2661}; 2662 2663/* 2664 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2665 */ 2666#define PF_ANCHORSTACK_MATCH 0x00000001 2667#define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2668 2669#define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2670#define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2671 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2672#define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2673 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2674} while (0) 2675 2676void 2677pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2678 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2679 int *match) 2680{ 2681 struct pf_anchor_stackframe *f; 2682 2683 PF_RULES_RASSERT(); 2684 2685 if (match) 2686 *match = 0; 2687 if (*depth >= PF_ANCHOR_STACKSIZE) { 2688 printf("%s: anchor stack overflow on %s\n", 2689 __func__, (*r)->anchor->name); 2690 *r = TAILQ_NEXT(*r, entries); 2691 return; 2692 } else if (*depth == 0 && a != NULL) 2693 *a = *r; 2694 f = stack + (*depth)++; 2695 f->rs = *rs; 2696 f->r = *r; 2697 if ((*r)->anchor_wildcard) { 2698 struct pf_anchor_node *parent = &(*r)->anchor->children; 2699 2700 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2701 *r = NULL; 2702 return; 2703 } 2704 *rs = &f->child->ruleset; 2705 } else { 2706 f->child = NULL; 2707 *rs = &(*r)->anchor->ruleset; 2708 } 2709 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2710} 2711 2712int 2713pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2714 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2715 int *match) 2716{ 2717 struct pf_anchor_stackframe *f; 2718 struct pf_rule *fr; 2719 int quick = 0; 2720 2721 PF_RULES_RASSERT(); 2722 2723 do { 2724 if (*depth <= 0) 2725 break; 2726 f = stack + *depth - 1; 2727 fr = PF_ANCHOR_RULE(f); 2728 if (f->child != NULL) { 2729 struct pf_anchor_node *parent; 2730 2731 /* 2732 * This block traverses through 2733 * a wildcard anchor. 2734 */ 2735 parent = &fr->anchor->children; 2736 if (match != NULL && *match) { 2737 /* 2738 * If any of "*" matched, then 2739 * "foo/ *" matched, mark frame 2740 * appropriately. 2741 */ 2742 PF_ANCHOR_SET_MATCH(f); 2743 *match = 0; 2744 } 2745 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2746 if (f->child != NULL) { 2747 *rs = &f->child->ruleset; 2748 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2749 if (*r == NULL) 2750 continue; 2751 else 2752 break; 2753 } 2754 } 2755 (*depth)--; 2756 if (*depth == 0 && a != NULL) 2757 *a = NULL; 2758 *rs = f->rs; 2759 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 2760 quick = fr->quick; 2761 *r = TAILQ_NEXT(fr, entries); 2762 } while (*r == NULL); 2763 2764 return (quick); 2765} 2766 2767#ifdef INET6 2768void 2769pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2770 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2771{ 2772 switch (af) { 2773#ifdef INET 2774 case AF_INET: 2775 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2776 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2777 break; 2778#endif /* INET */ 2779 case AF_INET6: 2780 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2781 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2782 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2783 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2784 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2785 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2786 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2787 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2788 break; 2789 } 2790} 2791 2792void 2793pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2794{ 2795 switch (af) { 2796#ifdef INET 2797 case AF_INET: 2798 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2799 break; 2800#endif /* INET */ 2801 case AF_INET6: 2802 if (addr->addr32[3] == 0xffffffff) { 2803 addr->addr32[3] = 0; 2804 if (addr->addr32[2] == 0xffffffff) { 2805 addr->addr32[2] = 0; 2806 if (addr->addr32[1] == 0xffffffff) { 2807 addr->addr32[1] = 0; 2808 addr->addr32[0] = 2809 htonl(ntohl(addr->addr32[0]) + 1); 2810 } else 2811 addr->addr32[1] = 2812 htonl(ntohl(addr->addr32[1]) + 1); 2813 } else 2814 addr->addr32[2] = 2815 htonl(ntohl(addr->addr32[2]) + 1); 2816 } else 2817 addr->addr32[3] = 2818 htonl(ntohl(addr->addr32[3]) + 1); 2819 break; 2820 } 2821} 2822#endif /* INET6 */ 2823 2824int 2825pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2826{ 2827 struct pf_addr *saddr, *daddr; 2828 u_int16_t sport, dport; 2829 struct inpcbinfo *pi; 2830 struct inpcb *inp; 2831 2832 pd->lookup.uid = UID_MAX; 2833 pd->lookup.gid = GID_MAX; 2834 2835 switch (pd->proto) { 2836 case IPPROTO_TCP: 2837 if (pd->hdr.tcp == NULL) 2838 return (-1); 2839 sport = pd->hdr.tcp->th_sport; 2840 dport = pd->hdr.tcp->th_dport; 2841 pi = &V_tcbinfo; 2842 break; 2843 case IPPROTO_UDP: 2844 if (pd->hdr.udp == NULL) 2845 return (-1); 2846 sport = pd->hdr.udp->uh_sport; 2847 dport = pd->hdr.udp->uh_dport; 2848 pi = &V_udbinfo; 2849 break; 2850 default: 2851 return (-1); 2852 } 2853 if (direction == PF_IN) { 2854 saddr = pd->src; 2855 daddr = pd->dst; 2856 } else { 2857 u_int16_t p; 2858 2859 p = sport; 2860 sport = dport; 2861 dport = p; 2862 saddr = pd->dst; 2863 daddr = pd->src; 2864 } 2865 switch (pd->af) { 2866#ifdef INET 2867 case AF_INET: 2868 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2869 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2870 if (inp == NULL) { 2871 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2872 daddr->v4, dport, INPLOOKUP_WILDCARD | 2873 INPLOOKUP_RLOCKPCB, NULL, m); 2874 if (inp == NULL) 2875 return (-1); 2876 } 2877 break; 2878#endif /* INET */ 2879#ifdef INET6 2880 case AF_INET6: 2881 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2882 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2883 if (inp == NULL) { 2884 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2885 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2886 INPLOOKUP_RLOCKPCB, NULL, m); 2887 if (inp == NULL) 2888 return (-1); 2889 } 2890 break; 2891#endif /* INET6 */ 2892 2893 default: 2894 return (-1); 2895 } 2896 INP_RLOCK_ASSERT(inp); 2897 pd->lookup.uid = inp->inp_cred->cr_uid; 2898 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2899 INP_RUNLOCK(inp); 2900 2901 return (1); 2902} 2903 2904static u_int8_t 2905pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2906{ 2907 int hlen; 2908 u_int8_t hdr[60]; 2909 u_int8_t *opt, optlen; 2910 u_int8_t wscale = 0; 2911 2912 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2913 if (hlen <= sizeof(struct tcphdr)) 2914 return (0); 2915 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2916 return (0); 2917 opt = hdr + sizeof(struct tcphdr); 2918 hlen -= sizeof(struct tcphdr); 2919 while (hlen >= 3) { 2920 switch (*opt) { 2921 case TCPOPT_EOL: 2922 case TCPOPT_NOP: 2923 ++opt; 2924 --hlen; 2925 break; 2926 case TCPOPT_WINDOW: 2927 wscale = opt[2]; 2928 if (wscale > TCP_MAX_WINSHIFT) 2929 wscale = TCP_MAX_WINSHIFT; 2930 wscale |= PF_WSCALE_FLAG; 2931 /* FALLTHROUGH */ 2932 default: 2933 optlen = opt[1]; 2934 if (optlen < 2) 2935 optlen = 2; 2936 hlen -= optlen; 2937 opt += optlen; 2938 break; 2939 } 2940 } 2941 return (wscale); 2942} 2943 2944static u_int16_t 2945pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2946{ 2947 int hlen; 2948 u_int8_t hdr[60]; 2949 u_int8_t *opt, optlen; 2950 u_int16_t mss = V_tcp_mssdflt; 2951 2952 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2953 if (hlen <= sizeof(struct tcphdr)) 2954 return (0); 2955 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2956 return (0); 2957 opt = hdr + sizeof(struct tcphdr); 2958 hlen -= sizeof(struct tcphdr); 2959 while (hlen >= TCPOLEN_MAXSEG) { 2960 switch (*opt) { 2961 case TCPOPT_EOL: 2962 case TCPOPT_NOP: 2963 ++opt; 2964 --hlen; 2965 break; 2966 case TCPOPT_MAXSEG: 2967 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2968 NTOHS(mss); 2969 /* FALLTHROUGH */ 2970 default: 2971 optlen = opt[1]; 2972 if (optlen < 2) 2973 optlen = 2; 2974 hlen -= optlen; 2975 opt += optlen; 2976 break; 2977 } 2978 } 2979 return (mss); 2980} 2981 2982static u_int16_t 2983pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 2984{ 2985#ifdef INET 2986 struct sockaddr_in *dst; 2987 struct route ro; 2988#endif /* INET */ 2989#ifdef INET6 2990 struct sockaddr_in6 *dst6; 2991 struct route_in6 ro6; 2992#endif /* INET6 */ 2993 struct rtentry *rt = NULL; 2994 int hlen = 0; 2995 u_int16_t mss = V_tcp_mssdflt; 2996 2997 switch (af) { 2998#ifdef INET 2999 case AF_INET: 3000 hlen = sizeof(struct ip); 3001 bzero(&ro, sizeof(ro)); 3002 dst = (struct sockaddr_in *)&ro.ro_dst; 3003 dst->sin_family = AF_INET; 3004 dst->sin_len = sizeof(*dst); 3005 dst->sin_addr = addr->v4; 3006 in_rtalloc_ign(&ro, 0, rtableid); 3007 rt = ro.ro_rt; 3008 break; 3009#endif /* INET */ 3010#ifdef INET6 3011 case AF_INET6: 3012 hlen = sizeof(struct ip6_hdr); 3013 bzero(&ro6, sizeof(ro6)); 3014 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3015 dst6->sin6_family = AF_INET6; 3016 dst6->sin6_len = sizeof(*dst6); 3017 dst6->sin6_addr = addr->v6; 3018 in6_rtalloc_ign(&ro6, 0, rtableid); 3019 rt = ro6.ro_rt; 3020 break; 3021#endif /* INET6 */ 3022 } 3023 3024 if (rt && rt->rt_ifp) { 3025 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3026 mss = max(V_tcp_mssdflt, mss); 3027 RTFREE(rt); 3028 } 3029 mss = min(mss, offer); 3030 mss = max(mss, 64); /* sanity - at least max opt space */ 3031 return (mss); 3032} 3033 3034static u_int32_t 3035pf_tcp_iss(struct pf_pdesc *pd) 3036{ 3037 MD5_CTX ctx; 3038 u_int32_t digest[4]; 3039 3040 if (V_pf_tcp_secret_init == 0) { 3041 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 3042 MD5Init(&V_pf_tcp_secret_ctx); 3043 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 3044 sizeof(V_pf_tcp_secret)); 3045 V_pf_tcp_secret_init = 1; 3046 } 3047 3048 ctx = V_pf_tcp_secret_ctx; 3049 3050 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3051 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3052 if (pd->af == AF_INET6) { 3053 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3054 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3055 } else { 3056 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3057 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3058 } 3059 MD5Final((u_char *)digest, &ctx); 3060 V_pf_tcp_iss_off += 4096; 3061#define ISN_RANDOM_INCREMENT (4096 - 1) 3062 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 3063 V_pf_tcp_iss_off); 3064#undef ISN_RANDOM_INCREMENT 3065} 3066 3067static int 3068pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3069 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 3070 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 3071{ 3072 struct pf_rule *nr = NULL; 3073 struct pf_addr * const saddr = pd->src; 3074 struct pf_addr * const daddr = pd->dst; 3075 sa_family_t af = pd->af; 3076 struct pf_rule *r, *a = NULL; 3077 struct pf_ruleset *ruleset = NULL; 3078 struct pf_src_node *nsn = NULL; 3079 struct tcphdr *th = pd->hdr.tcp; 3080 struct pf_state_key *sk = NULL, *nk = NULL; 3081 u_short reason; 3082 int rewrite = 0, hdrlen = 0; 3083 int tag = -1, rtableid = -1; 3084 int asd = 0; 3085 int match = 0; 3086 int state_icmp = 0; 3087 u_int16_t sport = 0, dport = 0; 3088 u_int16_t bproto_sum = 0, bip_sum = 0; 3089 u_int8_t icmptype = 0, icmpcode = 0; 3090 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3091 3092 PF_RULES_RASSERT(); 3093 3094 if (inp != NULL) { 3095 INP_LOCK_ASSERT(inp); 3096 pd->lookup.uid = inp->inp_cred->cr_uid; 3097 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3098 pd->lookup.done = 1; 3099 } 3100 3101 switch (pd->proto) { 3102 case IPPROTO_TCP: 3103 sport = th->th_sport; 3104 dport = th->th_dport; 3105 hdrlen = sizeof(*th); 3106 break; 3107 case IPPROTO_UDP: 3108 sport = pd->hdr.udp->uh_sport; 3109 dport = pd->hdr.udp->uh_dport; 3110 hdrlen = sizeof(*pd->hdr.udp); 3111 break; 3112#ifdef INET 3113 case IPPROTO_ICMP: 3114 if (pd->af != AF_INET) 3115 break; 3116 sport = dport = pd->hdr.icmp->icmp_id; 3117 hdrlen = sizeof(*pd->hdr.icmp); 3118 icmptype = pd->hdr.icmp->icmp_type; 3119 icmpcode = pd->hdr.icmp->icmp_code; 3120 3121 if (icmptype == ICMP_UNREACH || 3122 icmptype == ICMP_SOURCEQUENCH || 3123 icmptype == ICMP_REDIRECT || 3124 icmptype == ICMP_TIMXCEED || 3125 icmptype == ICMP_PARAMPROB) 3126 state_icmp++; 3127 break; 3128#endif /* INET */ 3129#ifdef INET6 3130 case IPPROTO_ICMPV6: 3131 if (af != AF_INET6) 3132 break; 3133 sport = dport = pd->hdr.icmp6->icmp6_id; 3134 hdrlen = sizeof(*pd->hdr.icmp6); 3135 icmptype = pd->hdr.icmp6->icmp6_type; 3136 icmpcode = pd->hdr.icmp6->icmp6_code; 3137 3138 if (icmptype == ICMP6_DST_UNREACH || 3139 icmptype == ICMP6_PACKET_TOO_BIG || 3140 icmptype == ICMP6_TIME_EXCEEDED || 3141 icmptype == ICMP6_PARAM_PROB) 3142 state_icmp++; 3143 break; 3144#endif /* INET6 */ 3145 default: 3146 sport = dport = hdrlen = 0; 3147 break; 3148 } 3149 3150 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3151 3152 /* check packet for BINAT/NAT/RDR */ 3153 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3154 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3155 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3156 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3157 3158 if (pd->ip_sum) 3159 bip_sum = *pd->ip_sum; 3160 3161 switch (pd->proto) { 3162 case IPPROTO_TCP: 3163 bproto_sum = th->th_sum; 3164 pd->proto_sum = &th->th_sum; 3165 3166 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3167 nk->port[pd->sidx] != sport) { 3168 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum, 3169 &th->th_sum, &nk->addr[pd->sidx], 3170 nk->port[pd->sidx], 0, af); 3171 pd->sport = &th->th_sport; 3172 sport = th->th_sport; 3173 } 3174 3175 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3176 nk->port[pd->didx] != dport) { 3177 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum, 3178 &th->th_sum, &nk->addr[pd->didx], 3179 nk->port[pd->didx], 0, af); 3180 dport = th->th_dport; 3181 pd->dport = &th->th_dport; 3182 } 3183 rewrite++; 3184 break; 3185 case IPPROTO_UDP: 3186 bproto_sum = pd->hdr.udp->uh_sum; 3187 pd->proto_sum = &pd->hdr.udp->uh_sum; 3188 3189 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3190 nk->port[pd->sidx] != sport) { 3191 pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport, 3192 pd->ip_sum, &pd->hdr.udp->uh_sum, 3193 &nk->addr[pd->sidx], 3194 nk->port[pd->sidx], 1, af); 3195 sport = pd->hdr.udp->uh_sport; 3196 pd->sport = &pd->hdr.udp->uh_sport; 3197 } 3198 3199 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3200 nk->port[pd->didx] != dport) { 3201 pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport, 3202 pd->ip_sum, &pd->hdr.udp->uh_sum, 3203 &nk->addr[pd->didx], 3204 nk->port[pd->didx], 1, af); 3205 dport = pd->hdr.udp->uh_dport; 3206 pd->dport = &pd->hdr.udp->uh_dport; 3207 } 3208 rewrite++; 3209 break; 3210#ifdef INET 3211 case IPPROTO_ICMP: 3212 nk->port[0] = nk->port[1]; 3213 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3214 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3215 nk->addr[pd->sidx].v4.s_addr, 0); 3216 3217 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3218 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3219 nk->addr[pd->didx].v4.s_addr, 0); 3220 3221 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3222 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3223 pd->hdr.icmp->icmp_cksum, sport, 3224 nk->port[1], 0); 3225 pd->hdr.icmp->icmp_id = nk->port[1]; 3226 pd->sport = &pd->hdr.icmp->icmp_id; 3227 } 3228 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3229 break; 3230#endif /* INET */ 3231#ifdef INET6 3232 case IPPROTO_ICMPV6: 3233 nk->port[0] = nk->port[1]; 3234 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3235 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3236 &nk->addr[pd->sidx], 0); 3237 3238 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3239 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3240 &nk->addr[pd->didx], 0); 3241 rewrite++; 3242 break; 3243#endif /* INET */ 3244 default: 3245 switch (af) { 3246#ifdef INET 3247 case AF_INET: 3248 if (PF_ANEQ(saddr, 3249 &nk->addr[pd->sidx], AF_INET)) 3250 pf_change_a(&saddr->v4.s_addr, 3251 pd->ip_sum, 3252 nk->addr[pd->sidx].v4.s_addr, 0); 3253 3254 if (PF_ANEQ(daddr, 3255 &nk->addr[pd->didx], AF_INET)) 3256 pf_change_a(&daddr->v4.s_addr, 3257 pd->ip_sum, 3258 nk->addr[pd->didx].v4.s_addr, 0); 3259 break; 3260#endif /* INET */ 3261#ifdef INET6 3262 case AF_INET6: 3263 if (PF_ANEQ(saddr, 3264 &nk->addr[pd->sidx], AF_INET6)) 3265 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3266 3267 if (PF_ANEQ(daddr, 3268 &nk->addr[pd->didx], AF_INET6)) 3269 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3270 break; 3271#endif /* INET */ 3272 } 3273 break; 3274 } 3275 if (nr->natpass) 3276 r = NULL; 3277 pd->nat_rule = nr; 3278 } 3279 3280 while (r != NULL) { 3281 r->evaluations++; 3282 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3283 r = r->skip[PF_SKIP_IFP].ptr; 3284 else if (r->direction && r->direction != direction) 3285 r = r->skip[PF_SKIP_DIR].ptr; 3286 else if (r->af && r->af != af) 3287 r = r->skip[PF_SKIP_AF].ptr; 3288 else if (r->proto && r->proto != pd->proto) 3289 r = r->skip[PF_SKIP_PROTO].ptr; 3290 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3291 r->src.neg, kif, M_GETFIB(m))) 3292 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3293 /* tcp/udp only. port_op always 0 in other cases */ 3294 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3295 r->src.port[0], r->src.port[1], sport)) 3296 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3297 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3298 r->dst.neg, NULL, M_GETFIB(m))) 3299 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3300 /* tcp/udp only. port_op always 0 in other cases */ 3301 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3302 r->dst.port[0], r->dst.port[1], dport)) 3303 r = r->skip[PF_SKIP_DST_PORT].ptr; 3304 /* icmp only. type always 0 in other cases */ 3305 else if (r->type && r->type != icmptype + 1) 3306 r = TAILQ_NEXT(r, entries); 3307 /* icmp only. type always 0 in other cases */ 3308 else if (r->code && r->code != icmpcode + 1) 3309 r = TAILQ_NEXT(r, entries); 3310 else if (r->tos && !(r->tos == pd->tos)) 3311 r = TAILQ_NEXT(r, entries); 3312 else if (r->rule_flag & PFRULE_FRAGMENT) 3313 r = TAILQ_NEXT(r, entries); 3314 else if (pd->proto == IPPROTO_TCP && 3315 (r->flagset & th->th_flags) != r->flags) 3316 r = TAILQ_NEXT(r, entries); 3317 /* tcp/udp only. uid.op always 0 in other cases */ 3318 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3319 pf_socket_lookup(direction, pd, m), 1)) && 3320 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3321 pd->lookup.uid)) 3322 r = TAILQ_NEXT(r, entries); 3323 /* tcp/udp only. gid.op always 0 in other cases */ 3324 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3325 pf_socket_lookup(direction, pd, m), 1)) && 3326 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3327 pd->lookup.gid)) 3328 r = TAILQ_NEXT(r, entries); 3329 else if (r->prob && 3330 r->prob <= arc4random()) 3331 r = TAILQ_NEXT(r, entries); 3332 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3333 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3334 r = TAILQ_NEXT(r, entries); 3335 else if (r->os_fingerprint != PF_OSFP_ANY && 3336 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3337 pf_osfp_fingerprint(pd, m, off, th), 3338 r->os_fingerprint))) 3339 r = TAILQ_NEXT(r, entries); 3340 else { 3341 if (r->tag) 3342 tag = r->tag; 3343 if (r->rtableid >= 0) 3344 rtableid = r->rtableid; 3345 if (r->anchor == NULL) { 3346 match = 1; 3347 *rm = r; 3348 *am = a; 3349 *rsm = ruleset; 3350 if ((*rm)->quick) 3351 break; 3352 r = TAILQ_NEXT(r, entries); 3353 } else 3354 pf_step_into_anchor(anchor_stack, &asd, 3355 &ruleset, PF_RULESET_FILTER, &r, &a, 3356 &match); 3357 } 3358 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3359 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3360 break; 3361 } 3362 r = *rm; 3363 a = *am; 3364 ruleset = *rsm; 3365 3366 REASON_SET(&reason, PFRES_MATCH); 3367 3368 if (r->log || (nr != NULL && nr->log)) { 3369 if (rewrite) 3370 m_copyback(m, off, hdrlen, pd->hdr.any); 3371 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3372 ruleset, pd, 1); 3373 } 3374 3375 if ((r->action == PF_DROP) && 3376 ((r->rule_flag & PFRULE_RETURNRST) || 3377 (r->rule_flag & PFRULE_RETURNICMP) || 3378 (r->rule_flag & PFRULE_RETURN))) { 3379 /* undo NAT changes, if they have taken place */ 3380 if (nr != NULL) { 3381 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3382 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3383 if (pd->sport) 3384 *pd->sport = sk->port[pd->sidx]; 3385 if (pd->dport) 3386 *pd->dport = sk->port[pd->didx]; 3387 if (pd->proto_sum) 3388 *pd->proto_sum = bproto_sum; 3389 if (pd->ip_sum) 3390 *pd->ip_sum = bip_sum; 3391 m_copyback(m, off, hdrlen, pd->hdr.any); 3392 } 3393 if (pd->proto == IPPROTO_TCP && 3394 ((r->rule_flag & PFRULE_RETURNRST) || 3395 (r->rule_flag & PFRULE_RETURN)) && 3396 !(th->th_flags & TH_RST)) { 3397 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3398 int len = 0; 3399#ifdef INET 3400 struct ip *h4; 3401#endif 3402#ifdef INET6 3403 struct ip6_hdr *h6; 3404#endif 3405 3406 switch (af) { 3407#ifdef INET 3408 case AF_INET: 3409 h4 = mtod(m, struct ip *); 3410 len = ntohs(h4->ip_len) - off; 3411 break; 3412#endif 3413#ifdef INET6 3414 case AF_INET6: 3415 h6 = mtod(m, struct ip6_hdr *); 3416 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3417 break; 3418#endif 3419 } 3420 3421 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3422 REASON_SET(&reason, PFRES_PROTCKSUM); 3423 else { 3424 if (th->th_flags & TH_SYN) 3425 ack++; 3426 if (th->th_flags & TH_FIN) 3427 ack++; 3428 pf_send_tcp(m, r, af, pd->dst, 3429 pd->src, th->th_dport, th->th_sport, 3430 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3431 r->return_ttl, 1, 0, kif->pfik_ifp); 3432 } 3433 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3434 r->return_icmp) 3435 pf_send_icmp(m, r->return_icmp >> 8, 3436 r->return_icmp & 255, af, r); 3437 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3438 r->return_icmp6) 3439 pf_send_icmp(m, r->return_icmp6 >> 8, 3440 r->return_icmp6 & 255, af, r); 3441 } 3442 3443 if (r->action == PF_DROP) 3444 goto cleanup; 3445 3446 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3447 REASON_SET(&reason, PFRES_MEMORY); 3448 goto cleanup; 3449 } 3450 if (rtableid >= 0) 3451 M_SETFIB(m, rtableid); 3452 3453 if (!state_icmp && (r->keep_state || nr != NULL || 3454 (pd->flags & PFDESC_TCP_NORM))) { 3455 int action; 3456 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3457 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3458 hdrlen); 3459 if (action != PF_PASS) 3460 return (action); 3461 } else { 3462 if (sk != NULL) 3463 uma_zfree(V_pf_state_key_z, sk); 3464 if (nk != NULL) 3465 uma_zfree(V_pf_state_key_z, nk); 3466 } 3467 3468 /* copy back packet headers if we performed NAT operations */ 3469 if (rewrite) 3470 m_copyback(m, off, hdrlen, pd->hdr.any); 3471 3472 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3473 direction == PF_OUT && 3474 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3475 /* 3476 * We want the state created, but we dont 3477 * want to send this in case a partner 3478 * firewall has to know about it to allow 3479 * replies through it. 3480 */ 3481 return (PF_DEFER); 3482 3483 return (PF_PASS); 3484 3485cleanup: 3486 if (sk != NULL) 3487 uma_zfree(V_pf_state_key_z, sk); 3488 if (nk != NULL) 3489 uma_zfree(V_pf_state_key_z, nk); 3490 return (PF_DROP); 3491} 3492 3493static int 3494pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3495 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3496 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3497 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3498 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3499{ 3500 struct pf_state *s = NULL; 3501 struct pf_src_node *sn = NULL; 3502 struct tcphdr *th = pd->hdr.tcp; 3503 u_int16_t mss = V_tcp_mssdflt; 3504 u_short reason; 3505 3506 /* check maximums */ 3507 if (r->max_states && 3508 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 3509 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 3510 REASON_SET(&reason, PFRES_MAXSTATES); 3511 return (PF_DROP); 3512 } 3513 /* src node for filter rule */ 3514 if ((r->rule_flag & PFRULE_SRCTRACK || 3515 r->rpool.opts & PF_POOL_STICKYADDR) && 3516 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3517 REASON_SET(&reason, PFRES_SRCLIMIT); 3518 goto csfailed; 3519 } 3520 /* src node for translation rule */ 3521 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3522 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3523 REASON_SET(&reason, PFRES_SRCLIMIT); 3524 goto csfailed; 3525 } 3526 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3527 if (s == NULL) { 3528 REASON_SET(&reason, PFRES_MEMORY); 3529 goto csfailed; 3530 } 3531 s->rule.ptr = r; 3532 s->nat_rule.ptr = nr; 3533 s->anchor.ptr = a; 3534 STATE_INC_COUNTERS(s); 3535 if (r->allow_opts) 3536 s->state_flags |= PFSTATE_ALLOWOPTS; 3537 if (r->rule_flag & PFRULE_STATESLOPPY) 3538 s->state_flags |= PFSTATE_SLOPPY; 3539 s->log = r->log & PF_LOG_ALL; 3540 s->sync_state = PFSYNC_S_NONE; 3541 if (nr != NULL) 3542 s->log |= nr->log & PF_LOG_ALL; 3543 switch (pd->proto) { 3544 case IPPROTO_TCP: 3545 s->src.seqlo = ntohl(th->th_seq); 3546 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3547 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3548 r->keep_state == PF_STATE_MODULATE) { 3549 /* Generate sequence number modulator */ 3550 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3551 0) 3552 s->src.seqdiff = 1; 3553 pf_change_proto_a(m, &th->th_seq, &th->th_sum, 3554 htonl(s->src.seqlo + s->src.seqdiff), 0); 3555 *rewrite = 1; 3556 } else 3557 s->src.seqdiff = 0; 3558 if (th->th_flags & TH_SYN) { 3559 s->src.seqhi++; 3560 s->src.wscale = pf_get_wscale(m, off, 3561 th->th_off, pd->af); 3562 } 3563 s->src.max_win = MAX(ntohs(th->th_win), 1); 3564 if (s->src.wscale & PF_WSCALE_MASK) { 3565 /* Remove scale factor from initial window */ 3566 int win = s->src.max_win; 3567 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3568 s->src.max_win = (win - 1) >> 3569 (s->src.wscale & PF_WSCALE_MASK); 3570 } 3571 if (th->th_flags & TH_FIN) 3572 s->src.seqhi++; 3573 s->dst.seqhi = 1; 3574 s->dst.max_win = 1; 3575 s->src.state = TCPS_SYN_SENT; 3576 s->dst.state = TCPS_CLOSED; 3577 s->timeout = PFTM_TCP_FIRST_PACKET; 3578 break; 3579 case IPPROTO_UDP: 3580 s->src.state = PFUDPS_SINGLE; 3581 s->dst.state = PFUDPS_NO_TRAFFIC; 3582 s->timeout = PFTM_UDP_FIRST_PACKET; 3583 break; 3584 case IPPROTO_ICMP: 3585#ifdef INET6 3586 case IPPROTO_ICMPV6: 3587#endif 3588 s->timeout = PFTM_ICMP_FIRST_PACKET; 3589 break; 3590 default: 3591 s->src.state = PFOTHERS_SINGLE; 3592 s->dst.state = PFOTHERS_NO_TRAFFIC; 3593 s->timeout = PFTM_OTHER_FIRST_PACKET; 3594 } 3595 3596 if (r->rt && r->rt != PF_FASTROUTE) { 3597 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) { 3598 REASON_SET(&reason, PFRES_BADSTATE); 3599 pf_src_tree_remove_state(s); 3600 STATE_DEC_COUNTERS(s); 3601 uma_zfree(V_pf_state_z, s); 3602 goto csfailed; 3603 } 3604 s->rt_kif = r->rpool.cur->kif; 3605 } 3606 3607 s->creation = time_uptime; 3608 s->expire = time_uptime; 3609 3610 if (sn != NULL) 3611 s->src_node = sn; 3612 if (nsn != NULL) { 3613 /* XXX We only modify one side for now. */ 3614 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3615 s->nat_src_node = nsn; 3616 } 3617 if (pd->proto == IPPROTO_TCP) { 3618 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3619 off, pd, th, &s->src, &s->dst)) { 3620 REASON_SET(&reason, PFRES_MEMORY); 3621 pf_src_tree_remove_state(s); 3622 STATE_DEC_COUNTERS(s); 3623 uma_zfree(V_pf_state_z, s); 3624 return (PF_DROP); 3625 } 3626 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3627 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3628 &s->src, &s->dst, rewrite)) { 3629 /* This really shouldn't happen!!! */ 3630 DPFPRINTF(PF_DEBUG_URGENT, 3631 ("pf_normalize_tcp_stateful failed on first pkt")); 3632 pf_normalize_tcp_cleanup(s); 3633 pf_src_tree_remove_state(s); 3634 STATE_DEC_COUNTERS(s); 3635 uma_zfree(V_pf_state_z, s); 3636 return (PF_DROP); 3637 } 3638 } 3639 s->direction = pd->dir; 3640 3641 /* 3642 * sk/nk could already been setup by pf_get_translation(). 3643 */ 3644 if (nr == NULL) { 3645 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3646 __func__, nr, sk, nk)); 3647 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3648 if (sk == NULL) 3649 goto csfailed; 3650 nk = sk; 3651 } else 3652 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3653 __func__, nr, sk, nk)); 3654 3655 /* Swap sk/nk for PF_OUT. */ 3656 if (pf_state_insert(BOUND_IFACE(r, kif), 3657 (pd->dir == PF_IN) ? sk : nk, 3658 (pd->dir == PF_IN) ? nk : sk, s)) { 3659 if (pd->proto == IPPROTO_TCP) 3660 pf_normalize_tcp_cleanup(s); 3661 REASON_SET(&reason, PFRES_STATEINS); 3662 pf_src_tree_remove_state(s); 3663 STATE_DEC_COUNTERS(s); 3664 uma_zfree(V_pf_state_z, s); 3665 return (PF_DROP); 3666 } else 3667 *sm = s; 3668 3669 if (tag > 0) 3670 s->tag = tag; 3671 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3672 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3673 s->src.state = PF_TCPS_PROXY_SRC; 3674 /* undo NAT changes, if they have taken place */ 3675 if (nr != NULL) { 3676 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3677 if (pd->dir == PF_OUT) 3678 skt = s->key[PF_SK_STACK]; 3679 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3680 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3681 if (pd->sport) 3682 *pd->sport = skt->port[pd->sidx]; 3683 if (pd->dport) 3684 *pd->dport = skt->port[pd->didx]; 3685 if (pd->proto_sum) 3686 *pd->proto_sum = bproto_sum; 3687 if (pd->ip_sum) 3688 *pd->ip_sum = bip_sum; 3689 m_copyback(m, off, hdrlen, pd->hdr.any); 3690 } 3691 s->src.seqhi = htonl(arc4random()); 3692 /* Find mss option */ 3693 int rtid = M_GETFIB(m); 3694 mss = pf_get_mss(m, off, th->th_off, pd->af); 3695 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3696 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3697 s->src.mss = mss; 3698 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3699 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3700 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3701 REASON_SET(&reason, PFRES_SYNPROXY); 3702 return (PF_SYNPROXY_DROP); 3703 } 3704 3705 return (PF_PASS); 3706 3707csfailed: 3708 if (sk != NULL) 3709 uma_zfree(V_pf_state_key_z, sk); 3710 if (nk != NULL) 3711 uma_zfree(V_pf_state_key_z, nk); 3712 3713 if (sn != NULL) { 3714 struct pf_srchash *sh; 3715 3716 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 3717 PF_HASHROW_LOCK(sh); 3718 if (--sn->states == 0 && sn->expire == 0) { 3719 pf_unlink_src_node(sn); 3720 uma_zfree(V_pf_sources_z, sn); 3721 counter_u64_add( 3722 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 3723 } 3724 PF_HASHROW_UNLOCK(sh); 3725 } 3726 3727 if (nsn != sn && nsn != NULL) { 3728 struct pf_srchash *sh; 3729 3730 sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)]; 3731 PF_HASHROW_LOCK(sh); 3732 if (--nsn->states == 0 && nsn->expire == 0) { 3733 pf_unlink_src_node(nsn); 3734 uma_zfree(V_pf_sources_z, nsn); 3735 counter_u64_add( 3736 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 3737 } 3738 PF_HASHROW_UNLOCK(sh); 3739 } 3740 3741 return (PF_DROP); 3742} 3743 3744static int 3745pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3746 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3747 struct pf_ruleset **rsm) 3748{ 3749 struct pf_rule *r, *a = NULL; 3750 struct pf_ruleset *ruleset = NULL; 3751 sa_family_t af = pd->af; 3752 u_short reason; 3753 int tag = -1; 3754 int asd = 0; 3755 int match = 0; 3756 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3757 3758 PF_RULES_RASSERT(); 3759 3760 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3761 while (r != NULL) { 3762 r->evaluations++; 3763 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3764 r = r->skip[PF_SKIP_IFP].ptr; 3765 else if (r->direction && r->direction != direction) 3766 r = r->skip[PF_SKIP_DIR].ptr; 3767 else if (r->af && r->af != af) 3768 r = r->skip[PF_SKIP_AF].ptr; 3769 else if (r->proto && r->proto != pd->proto) 3770 r = r->skip[PF_SKIP_PROTO].ptr; 3771 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3772 r->src.neg, kif, M_GETFIB(m))) 3773 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3774 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3775 r->dst.neg, NULL, M_GETFIB(m))) 3776 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3777 else if (r->tos && !(r->tos == pd->tos)) 3778 r = TAILQ_NEXT(r, entries); 3779 else if (r->os_fingerprint != PF_OSFP_ANY) 3780 r = TAILQ_NEXT(r, entries); 3781 else if (pd->proto == IPPROTO_UDP && 3782 (r->src.port_op || r->dst.port_op)) 3783 r = TAILQ_NEXT(r, entries); 3784 else if (pd->proto == IPPROTO_TCP && 3785 (r->src.port_op || r->dst.port_op || r->flagset)) 3786 r = TAILQ_NEXT(r, entries); 3787 else if ((pd->proto == IPPROTO_ICMP || 3788 pd->proto == IPPROTO_ICMPV6) && 3789 (r->type || r->code)) 3790 r = TAILQ_NEXT(r, entries); 3791 else if (r->prob && r->prob <= 3792 (arc4random() % (UINT_MAX - 1) + 1)) 3793 r = TAILQ_NEXT(r, entries); 3794 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3795 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3796 r = TAILQ_NEXT(r, entries); 3797 else { 3798 if (r->anchor == NULL) { 3799 match = 1; 3800 *rm = r; 3801 *am = a; 3802 *rsm = ruleset; 3803 if ((*rm)->quick) 3804 break; 3805 r = TAILQ_NEXT(r, entries); 3806 } else 3807 pf_step_into_anchor(anchor_stack, &asd, 3808 &ruleset, PF_RULESET_FILTER, &r, &a, 3809 &match); 3810 } 3811 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3812 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3813 break; 3814 } 3815 r = *rm; 3816 a = *am; 3817 ruleset = *rsm; 3818 3819 REASON_SET(&reason, PFRES_MATCH); 3820 3821 if (r->log) 3822 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3823 1); 3824 3825 if (r->action != PF_PASS) 3826 return (PF_DROP); 3827 3828 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3829 REASON_SET(&reason, PFRES_MEMORY); 3830 return (PF_DROP); 3831 } 3832 3833 return (PF_PASS); 3834} 3835 3836static int 3837pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3838 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3839 struct pf_pdesc *pd, u_short *reason, int *copyback) 3840{ 3841 struct tcphdr *th = pd->hdr.tcp; 3842 u_int16_t win = ntohs(th->th_win); 3843 u_int32_t ack, end, seq, orig_seq; 3844 u_int8_t sws, dws; 3845 int ackskew; 3846 3847 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3848 sws = src->wscale & PF_WSCALE_MASK; 3849 dws = dst->wscale & PF_WSCALE_MASK; 3850 } else 3851 sws = dws = 0; 3852 3853 /* 3854 * Sequence tracking algorithm from Guido van Rooij's paper: 3855 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3856 * tcp_filtering.ps 3857 */ 3858 3859 orig_seq = seq = ntohl(th->th_seq); 3860 if (src->seqlo == 0) { 3861 /* First packet from this end. Set its state */ 3862 3863 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3864 src->scrub == NULL) { 3865 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3866 REASON_SET(reason, PFRES_MEMORY); 3867 return (PF_DROP); 3868 } 3869 } 3870 3871 /* Deferred generation of sequence number modulator */ 3872 if (dst->seqdiff && !src->seqdiff) { 3873 /* use random iss for the TCP server */ 3874 while ((src->seqdiff = arc4random() - seq) == 0) 3875 ; 3876 ack = ntohl(th->th_ack) - dst->seqdiff; 3877 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 3878 src->seqdiff), 0); 3879 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 3880 *copyback = 1; 3881 } else { 3882 ack = ntohl(th->th_ack); 3883 } 3884 3885 end = seq + pd->p_len; 3886 if (th->th_flags & TH_SYN) { 3887 end++; 3888 if (dst->wscale & PF_WSCALE_FLAG) { 3889 src->wscale = pf_get_wscale(m, off, th->th_off, 3890 pd->af); 3891 if (src->wscale & PF_WSCALE_FLAG) { 3892 /* Remove scale factor from initial 3893 * window */ 3894 sws = src->wscale & PF_WSCALE_MASK; 3895 win = ((u_int32_t)win + (1 << sws) - 1) 3896 >> sws; 3897 dws = dst->wscale & PF_WSCALE_MASK; 3898 } else { 3899 /* fixup other window */ 3900 dst->max_win <<= dst->wscale & 3901 PF_WSCALE_MASK; 3902 /* in case of a retrans SYN|ACK */ 3903 dst->wscale = 0; 3904 } 3905 } 3906 } 3907 if (th->th_flags & TH_FIN) 3908 end++; 3909 3910 src->seqlo = seq; 3911 if (src->state < TCPS_SYN_SENT) 3912 src->state = TCPS_SYN_SENT; 3913 3914 /* 3915 * May need to slide the window (seqhi may have been set by 3916 * the crappy stack check or if we picked up the connection 3917 * after establishment) 3918 */ 3919 if (src->seqhi == 1 || 3920 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3921 src->seqhi = end + MAX(1, dst->max_win << dws); 3922 if (win > src->max_win) 3923 src->max_win = win; 3924 3925 } else { 3926 ack = ntohl(th->th_ack) - dst->seqdiff; 3927 if (src->seqdiff) { 3928 /* Modulate sequence numbers */ 3929 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 3930 src->seqdiff), 0); 3931 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 3932 *copyback = 1; 3933 } 3934 end = seq + pd->p_len; 3935 if (th->th_flags & TH_SYN) 3936 end++; 3937 if (th->th_flags & TH_FIN) 3938 end++; 3939 } 3940 3941 if ((th->th_flags & TH_ACK) == 0) { 3942 /* Let it pass through the ack skew check */ 3943 ack = dst->seqlo; 3944 } else if ((ack == 0 && 3945 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3946 /* broken tcp stacks do not set ack */ 3947 (dst->state < TCPS_SYN_SENT)) { 3948 /* 3949 * Many stacks (ours included) will set the ACK number in an 3950 * FIN|ACK if the SYN times out -- no sequence to ACK. 3951 */ 3952 ack = dst->seqlo; 3953 } 3954 3955 if (seq == end) { 3956 /* Ease sequencing restrictions on no data packets */ 3957 seq = src->seqlo; 3958 end = seq; 3959 } 3960 3961 ackskew = dst->seqlo - ack; 3962 3963 3964 /* 3965 * Need to demodulate the sequence numbers in any TCP SACK options 3966 * (Selective ACK). We could optionally validate the SACK values 3967 * against the current ACK window, either forwards or backwards, but 3968 * I'm not confident that SACK has been implemented properly 3969 * everywhere. It wouldn't surprise me if several stacks accidently 3970 * SACK too far backwards of previously ACKed data. There really aren't 3971 * any security implications of bad SACKing unless the target stack 3972 * doesn't validate the option length correctly. Someone trying to 3973 * spoof into a TCP connection won't bother blindly sending SACK 3974 * options anyway. 3975 */ 3976 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 3977 if (pf_modulate_sack(m, off, pd, th, dst)) 3978 *copyback = 1; 3979 } 3980 3981 3982#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3983 if (SEQ_GEQ(src->seqhi, end) && 3984 /* Last octet inside other's window space */ 3985 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3986 /* Retrans: not more than one window back */ 3987 (ackskew >= -MAXACKWINDOW) && 3988 /* Acking not more than one reassembled fragment backwards */ 3989 (ackskew <= (MAXACKWINDOW << sws)) && 3990 /* Acking not more than one window forward */ 3991 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 3992 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 3993 (pd->flags & PFDESC_IP_REAS) == 0)) { 3994 /* Require an exact/+1 sequence match on resets when possible */ 3995 3996 if (dst->scrub || src->scrub) { 3997 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 3998 *state, src, dst, copyback)) 3999 return (PF_DROP); 4000 } 4001 4002 /* update max window */ 4003 if (src->max_win < win) 4004 src->max_win = win; 4005 /* synchronize sequencing */ 4006 if (SEQ_GT(end, src->seqlo)) 4007 src->seqlo = end; 4008 /* slide the window of what the other end can send */ 4009 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4010 dst->seqhi = ack + MAX((win << sws), 1); 4011 4012 4013 /* update states */ 4014 if (th->th_flags & TH_SYN) 4015 if (src->state < TCPS_SYN_SENT) 4016 src->state = TCPS_SYN_SENT; 4017 if (th->th_flags & TH_FIN) 4018 if (src->state < TCPS_CLOSING) 4019 src->state = TCPS_CLOSING; 4020 if (th->th_flags & TH_ACK) { 4021 if (dst->state == TCPS_SYN_SENT) { 4022 dst->state = TCPS_ESTABLISHED; 4023 if (src->state == TCPS_ESTABLISHED && 4024 (*state)->src_node != NULL && 4025 pf_src_connlimit(state)) { 4026 REASON_SET(reason, PFRES_SRCLIMIT); 4027 return (PF_DROP); 4028 } 4029 } else if (dst->state == TCPS_CLOSING) 4030 dst->state = TCPS_FIN_WAIT_2; 4031 } 4032 if (th->th_flags & TH_RST) 4033 src->state = dst->state = TCPS_TIME_WAIT; 4034 4035 /* update expire time */ 4036 (*state)->expire = time_uptime; 4037 if (src->state >= TCPS_FIN_WAIT_2 && 4038 dst->state >= TCPS_FIN_WAIT_2) 4039 (*state)->timeout = PFTM_TCP_CLOSED; 4040 else if (src->state >= TCPS_CLOSING && 4041 dst->state >= TCPS_CLOSING) 4042 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4043 else if (src->state < TCPS_ESTABLISHED || 4044 dst->state < TCPS_ESTABLISHED) 4045 (*state)->timeout = PFTM_TCP_OPENING; 4046 else if (src->state >= TCPS_CLOSING || 4047 dst->state >= TCPS_CLOSING) 4048 (*state)->timeout = PFTM_TCP_CLOSING; 4049 else 4050 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4051 4052 /* Fall through to PASS packet */ 4053 4054 } else if ((dst->state < TCPS_SYN_SENT || 4055 dst->state >= TCPS_FIN_WAIT_2 || 4056 src->state >= TCPS_FIN_WAIT_2) && 4057 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4058 /* Within a window forward of the originating packet */ 4059 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4060 /* Within a window backward of the originating packet */ 4061 4062 /* 4063 * This currently handles three situations: 4064 * 1) Stupid stacks will shotgun SYNs before their peer 4065 * replies. 4066 * 2) When PF catches an already established stream (the 4067 * firewall rebooted, the state table was flushed, routes 4068 * changed...) 4069 * 3) Packets get funky immediately after the connection 4070 * closes (this should catch Solaris spurious ACK|FINs 4071 * that web servers like to spew after a close) 4072 * 4073 * This must be a little more careful than the above code 4074 * since packet floods will also be caught here. We don't 4075 * update the TTL here to mitigate the damage of a packet 4076 * flood and so the same code can handle awkward establishment 4077 * and a loosened connection close. 4078 * In the establishment case, a correct peer response will 4079 * validate the connection, go through the normal state code 4080 * and keep updating the state TTL. 4081 */ 4082 4083 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4084 printf("pf: loose state match: "); 4085 pf_print_state(*state); 4086 pf_print_flags(th->th_flags); 4087 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4088 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4089 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4090 (unsigned long long)(*state)->packets[1], 4091 pd->dir == PF_IN ? "in" : "out", 4092 pd->dir == (*state)->direction ? "fwd" : "rev"); 4093 } 4094 4095 if (dst->scrub || src->scrub) { 4096 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4097 *state, src, dst, copyback)) 4098 return (PF_DROP); 4099 } 4100 4101 /* update max window */ 4102 if (src->max_win < win) 4103 src->max_win = win; 4104 /* synchronize sequencing */ 4105 if (SEQ_GT(end, src->seqlo)) 4106 src->seqlo = end; 4107 /* slide the window of what the other end can send */ 4108 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4109 dst->seqhi = ack + MAX((win << sws), 1); 4110 4111 /* 4112 * Cannot set dst->seqhi here since this could be a shotgunned 4113 * SYN and not an already established connection. 4114 */ 4115 4116 if (th->th_flags & TH_FIN) 4117 if (src->state < TCPS_CLOSING) 4118 src->state = TCPS_CLOSING; 4119 if (th->th_flags & TH_RST) 4120 src->state = dst->state = TCPS_TIME_WAIT; 4121 4122 /* Fall through to PASS packet */ 4123 4124 } else { 4125 if ((*state)->dst.state == TCPS_SYN_SENT && 4126 (*state)->src.state == TCPS_SYN_SENT) { 4127 /* Send RST for state mismatches during handshake */ 4128 if (!(th->th_flags & TH_RST)) 4129 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4130 pd->dst, pd->src, th->th_dport, 4131 th->th_sport, ntohl(th->th_ack), 0, 4132 TH_RST, 0, 0, 4133 (*state)->rule.ptr->return_ttl, 1, 0, 4134 kif->pfik_ifp); 4135 src->seqlo = 0; 4136 src->seqhi = 1; 4137 src->max_win = 1; 4138 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4139 printf("pf: BAD state: "); 4140 pf_print_state(*state); 4141 pf_print_flags(th->th_flags); 4142 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4143 "pkts=%llu:%llu dir=%s,%s\n", 4144 seq, orig_seq, ack, pd->p_len, ackskew, 4145 (unsigned long long)(*state)->packets[0], 4146 (unsigned long long)(*state)->packets[1], 4147 pd->dir == PF_IN ? "in" : "out", 4148 pd->dir == (*state)->direction ? "fwd" : "rev"); 4149 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4150 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4151 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4152 ' ': '2', 4153 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4154 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4155 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4156 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4157 } 4158 REASON_SET(reason, PFRES_BADSTATE); 4159 return (PF_DROP); 4160 } 4161 4162 return (PF_PASS); 4163} 4164 4165static int 4166pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4167 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4168{ 4169 struct tcphdr *th = pd->hdr.tcp; 4170 4171 if (th->th_flags & TH_SYN) 4172 if (src->state < TCPS_SYN_SENT) 4173 src->state = TCPS_SYN_SENT; 4174 if (th->th_flags & TH_FIN) 4175 if (src->state < TCPS_CLOSING) 4176 src->state = TCPS_CLOSING; 4177 if (th->th_flags & TH_ACK) { 4178 if (dst->state == TCPS_SYN_SENT) { 4179 dst->state = TCPS_ESTABLISHED; 4180 if (src->state == TCPS_ESTABLISHED && 4181 (*state)->src_node != NULL && 4182 pf_src_connlimit(state)) { 4183 REASON_SET(reason, PFRES_SRCLIMIT); 4184 return (PF_DROP); 4185 } 4186 } else if (dst->state == TCPS_CLOSING) { 4187 dst->state = TCPS_FIN_WAIT_2; 4188 } else if (src->state == TCPS_SYN_SENT && 4189 dst->state < TCPS_SYN_SENT) { 4190 /* 4191 * Handle a special sloppy case where we only see one 4192 * half of the connection. If there is a ACK after 4193 * the initial SYN without ever seeing a packet from 4194 * the destination, set the connection to established. 4195 */ 4196 dst->state = src->state = TCPS_ESTABLISHED; 4197 if ((*state)->src_node != NULL && 4198 pf_src_connlimit(state)) { 4199 REASON_SET(reason, PFRES_SRCLIMIT); 4200 return (PF_DROP); 4201 } 4202 } else if (src->state == TCPS_CLOSING && 4203 dst->state == TCPS_ESTABLISHED && 4204 dst->seqlo == 0) { 4205 /* 4206 * Handle the closing of half connections where we 4207 * don't see the full bidirectional FIN/ACK+ACK 4208 * handshake. 4209 */ 4210 dst->state = TCPS_CLOSING; 4211 } 4212 } 4213 if (th->th_flags & TH_RST) 4214 src->state = dst->state = TCPS_TIME_WAIT; 4215 4216 /* update expire time */ 4217 (*state)->expire = time_uptime; 4218 if (src->state >= TCPS_FIN_WAIT_2 && 4219 dst->state >= TCPS_FIN_WAIT_2) 4220 (*state)->timeout = PFTM_TCP_CLOSED; 4221 else if (src->state >= TCPS_CLOSING && 4222 dst->state >= TCPS_CLOSING) 4223 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4224 else if (src->state < TCPS_ESTABLISHED || 4225 dst->state < TCPS_ESTABLISHED) 4226 (*state)->timeout = PFTM_TCP_OPENING; 4227 else if (src->state >= TCPS_CLOSING || 4228 dst->state >= TCPS_CLOSING) 4229 (*state)->timeout = PFTM_TCP_CLOSING; 4230 else 4231 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4232 4233 return (PF_PASS); 4234} 4235 4236static int 4237pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4238 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4239 u_short *reason) 4240{ 4241 struct pf_state_key_cmp key; 4242 struct tcphdr *th = pd->hdr.tcp; 4243 int copyback = 0; 4244 struct pf_state_peer *src, *dst; 4245 struct pf_state_key *sk; 4246 4247 bzero(&key, sizeof(key)); 4248 key.af = pd->af; 4249 key.proto = IPPROTO_TCP; 4250 if (direction == PF_IN) { /* wire side, straight */ 4251 PF_ACPY(&key.addr[0], pd->src, key.af); 4252 PF_ACPY(&key.addr[1], pd->dst, key.af); 4253 key.port[0] = th->th_sport; 4254 key.port[1] = th->th_dport; 4255 } else { /* stack side, reverse */ 4256 PF_ACPY(&key.addr[1], pd->src, key.af); 4257 PF_ACPY(&key.addr[0], pd->dst, key.af); 4258 key.port[1] = th->th_sport; 4259 key.port[0] = th->th_dport; 4260 } 4261 4262 STATE_LOOKUP(kif, &key, direction, *state, pd); 4263 4264 if (direction == (*state)->direction) { 4265 src = &(*state)->src; 4266 dst = &(*state)->dst; 4267 } else { 4268 src = &(*state)->dst; 4269 dst = &(*state)->src; 4270 } 4271 4272 sk = (*state)->key[pd->didx]; 4273 4274 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4275 if (direction != (*state)->direction) { 4276 REASON_SET(reason, PFRES_SYNPROXY); 4277 return (PF_SYNPROXY_DROP); 4278 } 4279 if (th->th_flags & TH_SYN) { 4280 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4281 REASON_SET(reason, PFRES_SYNPROXY); 4282 return (PF_DROP); 4283 } 4284 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4285 pd->src, th->th_dport, th->th_sport, 4286 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4287 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4288 REASON_SET(reason, PFRES_SYNPROXY); 4289 return (PF_SYNPROXY_DROP); 4290 } else if (!(th->th_flags & TH_ACK) || 4291 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4292 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4293 REASON_SET(reason, PFRES_SYNPROXY); 4294 return (PF_DROP); 4295 } else if ((*state)->src_node != NULL && 4296 pf_src_connlimit(state)) { 4297 REASON_SET(reason, PFRES_SRCLIMIT); 4298 return (PF_DROP); 4299 } else 4300 (*state)->src.state = PF_TCPS_PROXY_DST; 4301 } 4302 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4303 if (direction == (*state)->direction) { 4304 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4305 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4306 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4307 REASON_SET(reason, PFRES_SYNPROXY); 4308 return (PF_DROP); 4309 } 4310 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4311 if ((*state)->dst.seqhi == 1) 4312 (*state)->dst.seqhi = htonl(arc4random()); 4313 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4314 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4315 sk->port[pd->sidx], sk->port[pd->didx], 4316 (*state)->dst.seqhi, 0, TH_SYN, 0, 4317 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4318 REASON_SET(reason, PFRES_SYNPROXY); 4319 return (PF_SYNPROXY_DROP); 4320 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4321 (TH_SYN|TH_ACK)) || 4322 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4323 REASON_SET(reason, PFRES_SYNPROXY); 4324 return (PF_DROP); 4325 } else { 4326 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4327 (*state)->dst.seqlo = ntohl(th->th_seq); 4328 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4329 pd->src, th->th_dport, th->th_sport, 4330 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4331 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4332 (*state)->tag, NULL); 4333 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4334 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4335 sk->port[pd->sidx], sk->port[pd->didx], 4336 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4337 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4338 (*state)->src.seqdiff = (*state)->dst.seqhi - 4339 (*state)->src.seqlo; 4340 (*state)->dst.seqdiff = (*state)->src.seqhi - 4341 (*state)->dst.seqlo; 4342 (*state)->src.seqhi = (*state)->src.seqlo + 4343 (*state)->dst.max_win; 4344 (*state)->dst.seqhi = (*state)->dst.seqlo + 4345 (*state)->src.max_win; 4346 (*state)->src.wscale = (*state)->dst.wscale = 0; 4347 (*state)->src.state = (*state)->dst.state = 4348 TCPS_ESTABLISHED; 4349 REASON_SET(reason, PFRES_SYNPROXY); 4350 return (PF_SYNPROXY_DROP); 4351 } 4352 } 4353 4354 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4355 dst->state >= TCPS_FIN_WAIT_2 && 4356 src->state >= TCPS_FIN_WAIT_2) { 4357 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4358 printf("pf: state reuse "); 4359 pf_print_state(*state); 4360 pf_print_flags(th->th_flags); 4361 printf("\n"); 4362 } 4363 /* XXX make sure it's the same direction ?? */ 4364 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4365 pf_unlink_state(*state, PF_ENTER_LOCKED); 4366 *state = NULL; 4367 return (PF_DROP); 4368 } 4369 4370 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4371 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4372 return (PF_DROP); 4373 } else { 4374 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4375 ©back) == PF_DROP) 4376 return (PF_DROP); 4377 } 4378 4379 /* translate source/destination address, if necessary */ 4380 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4381 struct pf_state_key *nk = (*state)->key[pd->didx]; 4382 4383 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4384 nk->port[pd->sidx] != th->th_sport) 4385 pf_change_ap(m, pd->src, &th->th_sport, 4386 pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], 4387 nk->port[pd->sidx], 0, pd->af); 4388 4389 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4390 nk->port[pd->didx] != th->th_dport) 4391 pf_change_ap(m, pd->dst, &th->th_dport, 4392 pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], 4393 nk->port[pd->didx], 0, pd->af); 4394 copyback = 1; 4395 } 4396 4397 /* Copyback sequence modulation or stateful scrub changes if needed */ 4398 if (copyback) 4399 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4400 4401 return (PF_PASS); 4402} 4403 4404static int 4405pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4406 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4407{ 4408 struct pf_state_peer *src, *dst; 4409 struct pf_state_key_cmp key; 4410 struct udphdr *uh = pd->hdr.udp; 4411 4412 bzero(&key, sizeof(key)); 4413 key.af = pd->af; 4414 key.proto = IPPROTO_UDP; 4415 if (direction == PF_IN) { /* wire side, straight */ 4416 PF_ACPY(&key.addr[0], pd->src, key.af); 4417 PF_ACPY(&key.addr[1], pd->dst, key.af); 4418 key.port[0] = uh->uh_sport; 4419 key.port[1] = uh->uh_dport; 4420 } else { /* stack side, reverse */ 4421 PF_ACPY(&key.addr[1], pd->src, key.af); 4422 PF_ACPY(&key.addr[0], pd->dst, key.af); 4423 key.port[1] = uh->uh_sport; 4424 key.port[0] = uh->uh_dport; 4425 } 4426 4427 STATE_LOOKUP(kif, &key, direction, *state, pd); 4428 4429 if (direction == (*state)->direction) { 4430 src = &(*state)->src; 4431 dst = &(*state)->dst; 4432 } else { 4433 src = &(*state)->dst; 4434 dst = &(*state)->src; 4435 } 4436 4437 /* update states */ 4438 if (src->state < PFUDPS_SINGLE) 4439 src->state = PFUDPS_SINGLE; 4440 if (dst->state == PFUDPS_SINGLE) 4441 dst->state = PFUDPS_MULTIPLE; 4442 4443 /* update expire time */ 4444 (*state)->expire = time_uptime; 4445 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4446 (*state)->timeout = PFTM_UDP_MULTIPLE; 4447 else 4448 (*state)->timeout = PFTM_UDP_SINGLE; 4449 4450 /* translate source/destination address, if necessary */ 4451 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4452 struct pf_state_key *nk = (*state)->key[pd->didx]; 4453 4454 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4455 nk->port[pd->sidx] != uh->uh_sport) 4456 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 4457 &uh->uh_sum, &nk->addr[pd->sidx], 4458 nk->port[pd->sidx], 1, pd->af); 4459 4460 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4461 nk->port[pd->didx] != uh->uh_dport) 4462 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 4463 &uh->uh_sum, &nk->addr[pd->didx], 4464 nk->port[pd->didx], 1, pd->af); 4465 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4466 } 4467 4468 return (PF_PASS); 4469} 4470 4471static int 4472pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4473 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4474{ 4475 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4476 u_int16_t icmpid = 0, *icmpsum; 4477 u_int8_t icmptype; 4478 int state_icmp = 0; 4479 struct pf_state_key_cmp key; 4480 4481 bzero(&key, sizeof(key)); 4482 switch (pd->proto) { 4483#ifdef INET 4484 case IPPROTO_ICMP: 4485 icmptype = pd->hdr.icmp->icmp_type; 4486 icmpid = pd->hdr.icmp->icmp_id; 4487 icmpsum = &pd->hdr.icmp->icmp_cksum; 4488 4489 if (icmptype == ICMP_UNREACH || 4490 icmptype == ICMP_SOURCEQUENCH || 4491 icmptype == ICMP_REDIRECT || 4492 icmptype == ICMP_TIMXCEED || 4493 icmptype == ICMP_PARAMPROB) 4494 state_icmp++; 4495 break; 4496#endif /* INET */ 4497#ifdef INET6 4498 case IPPROTO_ICMPV6: 4499 icmptype = pd->hdr.icmp6->icmp6_type; 4500 icmpid = pd->hdr.icmp6->icmp6_id; 4501 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4502 4503 if (icmptype == ICMP6_DST_UNREACH || 4504 icmptype == ICMP6_PACKET_TOO_BIG || 4505 icmptype == ICMP6_TIME_EXCEEDED || 4506 icmptype == ICMP6_PARAM_PROB) 4507 state_icmp++; 4508 break; 4509#endif /* INET6 */ 4510 } 4511 4512 if (!state_icmp) { 4513 4514 /* 4515 * ICMP query/reply message not related to a TCP/UDP packet. 4516 * Search for an ICMP state. 4517 */ 4518 key.af = pd->af; 4519 key.proto = pd->proto; 4520 key.port[0] = key.port[1] = icmpid; 4521 if (direction == PF_IN) { /* wire side, straight */ 4522 PF_ACPY(&key.addr[0], pd->src, key.af); 4523 PF_ACPY(&key.addr[1], pd->dst, key.af); 4524 } else { /* stack side, reverse */ 4525 PF_ACPY(&key.addr[1], pd->src, key.af); 4526 PF_ACPY(&key.addr[0], pd->dst, key.af); 4527 } 4528 4529 STATE_LOOKUP(kif, &key, direction, *state, pd); 4530 4531 (*state)->expire = time_uptime; 4532 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4533 4534 /* translate source/destination address, if necessary */ 4535 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4536 struct pf_state_key *nk = (*state)->key[pd->didx]; 4537 4538 switch (pd->af) { 4539#ifdef INET 4540 case AF_INET: 4541 if (PF_ANEQ(pd->src, 4542 &nk->addr[pd->sidx], AF_INET)) 4543 pf_change_a(&saddr->v4.s_addr, 4544 pd->ip_sum, 4545 nk->addr[pd->sidx].v4.s_addr, 0); 4546 4547 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4548 AF_INET)) 4549 pf_change_a(&daddr->v4.s_addr, 4550 pd->ip_sum, 4551 nk->addr[pd->didx].v4.s_addr, 0); 4552 4553 if (nk->port[0] != 4554 pd->hdr.icmp->icmp_id) { 4555 pd->hdr.icmp->icmp_cksum = 4556 pf_cksum_fixup( 4557 pd->hdr.icmp->icmp_cksum, icmpid, 4558 nk->port[pd->sidx], 0); 4559 pd->hdr.icmp->icmp_id = 4560 nk->port[pd->sidx]; 4561 } 4562 4563 m_copyback(m, off, ICMP_MINLEN, 4564 (caddr_t )pd->hdr.icmp); 4565 break; 4566#endif /* INET */ 4567#ifdef INET6 4568 case AF_INET6: 4569 if (PF_ANEQ(pd->src, 4570 &nk->addr[pd->sidx], AF_INET6)) 4571 pf_change_a6(saddr, 4572 &pd->hdr.icmp6->icmp6_cksum, 4573 &nk->addr[pd->sidx], 0); 4574 4575 if (PF_ANEQ(pd->dst, 4576 &nk->addr[pd->didx], AF_INET6)) 4577 pf_change_a6(daddr, 4578 &pd->hdr.icmp6->icmp6_cksum, 4579 &nk->addr[pd->didx], 0); 4580 4581 m_copyback(m, off, sizeof(struct icmp6_hdr), 4582 (caddr_t )pd->hdr.icmp6); 4583 break; 4584#endif /* INET6 */ 4585 } 4586 } 4587 return (PF_PASS); 4588 4589 } else { 4590 /* 4591 * ICMP error message in response to a TCP/UDP packet. 4592 * Extract the inner TCP/UDP header and search for that state. 4593 */ 4594 4595 struct pf_pdesc pd2; 4596 bzero(&pd2, sizeof pd2); 4597#ifdef INET 4598 struct ip h2; 4599#endif /* INET */ 4600#ifdef INET6 4601 struct ip6_hdr h2_6; 4602 int terminal = 0; 4603#endif /* INET6 */ 4604 int ipoff2 = 0; 4605 int off2 = 0; 4606 4607 pd2.af = pd->af; 4608 /* Payload packet is from the opposite direction. */ 4609 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4610 pd2.didx = (direction == PF_IN) ? 0 : 1; 4611 switch (pd->af) { 4612#ifdef INET 4613 case AF_INET: 4614 /* offset of h2 in mbuf chain */ 4615 ipoff2 = off + ICMP_MINLEN; 4616 4617 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4618 NULL, reason, pd2.af)) { 4619 DPFPRINTF(PF_DEBUG_MISC, 4620 ("pf: ICMP error message too short " 4621 "(ip)\n")); 4622 return (PF_DROP); 4623 } 4624 /* 4625 * ICMP error messages don't refer to non-first 4626 * fragments 4627 */ 4628 if (h2.ip_off & htons(IP_OFFMASK)) { 4629 REASON_SET(reason, PFRES_FRAG); 4630 return (PF_DROP); 4631 } 4632 4633 /* offset of protocol header that follows h2 */ 4634 off2 = ipoff2 + (h2.ip_hl << 2); 4635 4636 pd2.proto = h2.ip_p; 4637 pd2.src = (struct pf_addr *)&h2.ip_src; 4638 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4639 pd2.ip_sum = &h2.ip_sum; 4640 break; 4641#endif /* INET */ 4642#ifdef INET6 4643 case AF_INET6: 4644 ipoff2 = off + sizeof(struct icmp6_hdr); 4645 4646 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4647 NULL, reason, pd2.af)) { 4648 DPFPRINTF(PF_DEBUG_MISC, 4649 ("pf: ICMP error message too short " 4650 "(ip6)\n")); 4651 return (PF_DROP); 4652 } 4653 pd2.proto = h2_6.ip6_nxt; 4654 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4655 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4656 pd2.ip_sum = NULL; 4657 off2 = ipoff2 + sizeof(h2_6); 4658 do { 4659 switch (pd2.proto) { 4660 case IPPROTO_FRAGMENT: 4661 /* 4662 * ICMPv6 error messages for 4663 * non-first fragments 4664 */ 4665 REASON_SET(reason, PFRES_FRAG); 4666 return (PF_DROP); 4667 case IPPROTO_AH: 4668 case IPPROTO_HOPOPTS: 4669 case IPPROTO_ROUTING: 4670 case IPPROTO_DSTOPTS: { 4671 /* get next header and header length */ 4672 struct ip6_ext opt6; 4673 4674 if (!pf_pull_hdr(m, off2, &opt6, 4675 sizeof(opt6), NULL, reason, 4676 pd2.af)) { 4677 DPFPRINTF(PF_DEBUG_MISC, 4678 ("pf: ICMPv6 short opt\n")); 4679 return (PF_DROP); 4680 } 4681 if (pd2.proto == IPPROTO_AH) 4682 off2 += (opt6.ip6e_len + 2) * 4; 4683 else 4684 off2 += (opt6.ip6e_len + 1) * 8; 4685 pd2.proto = opt6.ip6e_nxt; 4686 /* goto the next header */ 4687 break; 4688 } 4689 default: 4690 terminal++; 4691 break; 4692 } 4693 } while (!terminal); 4694 break; 4695#endif /* INET6 */ 4696 } 4697 4698 switch (pd2.proto) { 4699 case IPPROTO_TCP: { 4700 struct tcphdr th; 4701 u_int32_t seq; 4702 struct pf_state_peer *src, *dst; 4703 u_int8_t dws; 4704 int copyback = 0; 4705 4706 /* 4707 * Only the first 8 bytes of the TCP header can be 4708 * expected. Don't access any TCP header fields after 4709 * th_seq, an ackskew test is not possible. 4710 */ 4711 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4712 pd2.af)) { 4713 DPFPRINTF(PF_DEBUG_MISC, 4714 ("pf: ICMP error message too short " 4715 "(tcp)\n")); 4716 return (PF_DROP); 4717 } 4718 4719 key.af = pd2.af; 4720 key.proto = IPPROTO_TCP; 4721 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4722 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4723 key.port[pd2.sidx] = th.th_sport; 4724 key.port[pd2.didx] = th.th_dport; 4725 4726 STATE_LOOKUP(kif, &key, direction, *state, pd); 4727 4728 if (direction == (*state)->direction) { 4729 src = &(*state)->dst; 4730 dst = &(*state)->src; 4731 } else { 4732 src = &(*state)->src; 4733 dst = &(*state)->dst; 4734 } 4735 4736 if (src->wscale && dst->wscale) 4737 dws = dst->wscale & PF_WSCALE_MASK; 4738 else 4739 dws = 0; 4740 4741 /* Demodulate sequence number */ 4742 seq = ntohl(th.th_seq) - src->seqdiff; 4743 if (src->seqdiff) { 4744 pf_change_a(&th.th_seq, icmpsum, 4745 htonl(seq), 0); 4746 copyback = 1; 4747 } 4748 4749 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4750 (!SEQ_GEQ(src->seqhi, seq) || 4751 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4752 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4753 printf("pf: BAD ICMP %d:%d ", 4754 icmptype, pd->hdr.icmp->icmp_code); 4755 pf_print_host(pd->src, 0, pd->af); 4756 printf(" -> "); 4757 pf_print_host(pd->dst, 0, pd->af); 4758 printf(" state: "); 4759 pf_print_state(*state); 4760 printf(" seq=%u\n", seq); 4761 } 4762 REASON_SET(reason, PFRES_BADSTATE); 4763 return (PF_DROP); 4764 } else { 4765 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4766 printf("pf: OK ICMP %d:%d ", 4767 icmptype, pd->hdr.icmp->icmp_code); 4768 pf_print_host(pd->src, 0, pd->af); 4769 printf(" -> "); 4770 pf_print_host(pd->dst, 0, pd->af); 4771 printf(" state: "); 4772 pf_print_state(*state); 4773 printf(" seq=%u\n", seq); 4774 } 4775 } 4776 4777 /* translate source/destination address, if necessary */ 4778 if ((*state)->key[PF_SK_WIRE] != 4779 (*state)->key[PF_SK_STACK]) { 4780 struct pf_state_key *nk = 4781 (*state)->key[pd->didx]; 4782 4783 if (PF_ANEQ(pd2.src, 4784 &nk->addr[pd2.sidx], pd2.af) || 4785 nk->port[pd2.sidx] != th.th_sport) 4786 pf_change_icmp(pd2.src, &th.th_sport, 4787 daddr, &nk->addr[pd2.sidx], 4788 nk->port[pd2.sidx], NULL, 4789 pd2.ip_sum, icmpsum, 4790 pd->ip_sum, 0, pd2.af); 4791 4792 if (PF_ANEQ(pd2.dst, 4793 &nk->addr[pd2.didx], pd2.af) || 4794 nk->port[pd2.didx] != th.th_dport) 4795 pf_change_icmp(pd2.dst, &th.th_dport, 4796 NULL, /* XXX Inbound NAT? */ 4797 &nk->addr[pd2.didx], 4798 nk->port[pd2.didx], NULL, 4799 pd2.ip_sum, icmpsum, 4800 pd->ip_sum, 0, pd2.af); 4801 copyback = 1; 4802 } 4803 4804 if (copyback) { 4805 switch (pd2.af) { 4806#ifdef INET 4807 case AF_INET: 4808 m_copyback(m, off, ICMP_MINLEN, 4809 (caddr_t )pd->hdr.icmp); 4810 m_copyback(m, ipoff2, sizeof(h2), 4811 (caddr_t )&h2); 4812 break; 4813#endif /* INET */ 4814#ifdef INET6 4815 case AF_INET6: 4816 m_copyback(m, off, 4817 sizeof(struct icmp6_hdr), 4818 (caddr_t )pd->hdr.icmp6); 4819 m_copyback(m, ipoff2, sizeof(h2_6), 4820 (caddr_t )&h2_6); 4821 break; 4822#endif /* INET6 */ 4823 } 4824 m_copyback(m, off2, 8, (caddr_t)&th); 4825 } 4826 4827 return (PF_PASS); 4828 break; 4829 } 4830 case IPPROTO_UDP: { 4831 struct udphdr uh; 4832 4833 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4834 NULL, reason, pd2.af)) { 4835 DPFPRINTF(PF_DEBUG_MISC, 4836 ("pf: ICMP error message too short " 4837 "(udp)\n")); 4838 return (PF_DROP); 4839 } 4840 4841 key.af = pd2.af; 4842 key.proto = IPPROTO_UDP; 4843 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4844 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4845 key.port[pd2.sidx] = uh.uh_sport; 4846 key.port[pd2.didx] = uh.uh_dport; 4847 4848 STATE_LOOKUP(kif, &key, direction, *state, pd); 4849 4850 /* translate source/destination address, if necessary */ 4851 if ((*state)->key[PF_SK_WIRE] != 4852 (*state)->key[PF_SK_STACK]) { 4853 struct pf_state_key *nk = 4854 (*state)->key[pd->didx]; 4855 4856 if (PF_ANEQ(pd2.src, 4857 &nk->addr[pd2.sidx], pd2.af) || 4858 nk->port[pd2.sidx] != uh.uh_sport) 4859 pf_change_icmp(pd2.src, &uh.uh_sport, 4860 daddr, &nk->addr[pd2.sidx], 4861 nk->port[pd2.sidx], &uh.uh_sum, 4862 pd2.ip_sum, icmpsum, 4863 pd->ip_sum, 1, pd2.af); 4864 4865 if (PF_ANEQ(pd2.dst, 4866 &nk->addr[pd2.didx], pd2.af) || 4867 nk->port[pd2.didx] != uh.uh_dport) 4868 pf_change_icmp(pd2.dst, &uh.uh_dport, 4869 NULL, /* XXX Inbound NAT? */ 4870 &nk->addr[pd2.didx], 4871 nk->port[pd2.didx], &uh.uh_sum, 4872 pd2.ip_sum, icmpsum, 4873 pd->ip_sum, 1, pd2.af); 4874 4875 switch (pd2.af) { 4876#ifdef INET 4877 case AF_INET: 4878 m_copyback(m, off, ICMP_MINLEN, 4879 (caddr_t )pd->hdr.icmp); 4880 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4881 break; 4882#endif /* INET */ 4883#ifdef INET6 4884 case AF_INET6: 4885 m_copyback(m, off, 4886 sizeof(struct icmp6_hdr), 4887 (caddr_t )pd->hdr.icmp6); 4888 m_copyback(m, ipoff2, sizeof(h2_6), 4889 (caddr_t )&h2_6); 4890 break; 4891#endif /* INET6 */ 4892 } 4893 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4894 } 4895 return (PF_PASS); 4896 break; 4897 } 4898#ifdef INET 4899 case IPPROTO_ICMP: { 4900 struct icmp iih; 4901 4902 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4903 NULL, reason, pd2.af)) { 4904 DPFPRINTF(PF_DEBUG_MISC, 4905 ("pf: ICMP error message too short i" 4906 "(icmp)\n")); 4907 return (PF_DROP); 4908 } 4909 4910 key.af = pd2.af; 4911 key.proto = IPPROTO_ICMP; 4912 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4913 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4914 key.port[0] = key.port[1] = iih.icmp_id; 4915 4916 STATE_LOOKUP(kif, &key, direction, *state, pd); 4917 4918 /* translate source/destination address, if necessary */ 4919 if ((*state)->key[PF_SK_WIRE] != 4920 (*state)->key[PF_SK_STACK]) { 4921 struct pf_state_key *nk = 4922 (*state)->key[pd->didx]; 4923 4924 if (PF_ANEQ(pd2.src, 4925 &nk->addr[pd2.sidx], pd2.af) || 4926 nk->port[pd2.sidx] != iih.icmp_id) 4927 pf_change_icmp(pd2.src, &iih.icmp_id, 4928 daddr, &nk->addr[pd2.sidx], 4929 nk->port[pd2.sidx], NULL, 4930 pd2.ip_sum, icmpsum, 4931 pd->ip_sum, 0, AF_INET); 4932 4933 if (PF_ANEQ(pd2.dst, 4934 &nk->addr[pd2.didx], pd2.af) || 4935 nk->port[pd2.didx] != iih.icmp_id) 4936 pf_change_icmp(pd2.dst, &iih.icmp_id, 4937 NULL, /* XXX Inbound NAT? */ 4938 &nk->addr[pd2.didx], 4939 nk->port[pd2.didx], NULL, 4940 pd2.ip_sum, icmpsum, 4941 pd->ip_sum, 0, AF_INET); 4942 4943 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4944 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4945 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4946 } 4947 return (PF_PASS); 4948 break; 4949 } 4950#endif /* INET */ 4951#ifdef INET6 4952 case IPPROTO_ICMPV6: { 4953 struct icmp6_hdr iih; 4954 4955 if (!pf_pull_hdr(m, off2, &iih, 4956 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4957 DPFPRINTF(PF_DEBUG_MISC, 4958 ("pf: ICMP error message too short " 4959 "(icmp6)\n")); 4960 return (PF_DROP); 4961 } 4962 4963 key.af = pd2.af; 4964 key.proto = IPPROTO_ICMPV6; 4965 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4966 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4967 key.port[0] = key.port[1] = iih.icmp6_id; 4968 4969 STATE_LOOKUP(kif, &key, direction, *state, pd); 4970 4971 /* translate source/destination address, if necessary */ 4972 if ((*state)->key[PF_SK_WIRE] != 4973 (*state)->key[PF_SK_STACK]) { 4974 struct pf_state_key *nk = 4975 (*state)->key[pd->didx]; 4976 4977 if (PF_ANEQ(pd2.src, 4978 &nk->addr[pd2.sidx], pd2.af) || 4979 nk->port[pd2.sidx] != iih.icmp6_id) 4980 pf_change_icmp(pd2.src, &iih.icmp6_id, 4981 daddr, &nk->addr[pd2.sidx], 4982 nk->port[pd2.sidx], NULL, 4983 pd2.ip_sum, icmpsum, 4984 pd->ip_sum, 0, AF_INET6); 4985 4986 if (PF_ANEQ(pd2.dst, 4987 &nk->addr[pd2.didx], pd2.af) || 4988 nk->port[pd2.didx] != iih.icmp6_id) 4989 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4990 NULL, /* XXX Inbound NAT? */ 4991 &nk->addr[pd2.didx], 4992 nk->port[pd2.didx], NULL, 4993 pd2.ip_sum, icmpsum, 4994 pd->ip_sum, 0, AF_INET6); 4995 4996 m_copyback(m, off, sizeof(struct icmp6_hdr), 4997 (caddr_t)pd->hdr.icmp6); 4998 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4999 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5000 (caddr_t)&iih); 5001 } 5002 return (PF_PASS); 5003 break; 5004 } 5005#endif /* INET6 */ 5006 default: { 5007 key.af = pd2.af; 5008 key.proto = pd2.proto; 5009 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5010 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5011 key.port[0] = key.port[1] = 0; 5012 5013 STATE_LOOKUP(kif, &key, direction, *state, pd); 5014 5015 /* translate source/destination address, if necessary */ 5016 if ((*state)->key[PF_SK_WIRE] != 5017 (*state)->key[PF_SK_STACK]) { 5018 struct pf_state_key *nk = 5019 (*state)->key[pd->didx]; 5020 5021 if (PF_ANEQ(pd2.src, 5022 &nk->addr[pd2.sidx], pd2.af)) 5023 pf_change_icmp(pd2.src, NULL, daddr, 5024 &nk->addr[pd2.sidx], 0, NULL, 5025 pd2.ip_sum, icmpsum, 5026 pd->ip_sum, 0, pd2.af); 5027 5028 if (PF_ANEQ(pd2.dst, 5029 &nk->addr[pd2.didx], pd2.af)) 5030 pf_change_icmp(pd2.src, NULL, 5031 NULL, /* XXX Inbound NAT? */ 5032 &nk->addr[pd2.didx], 0, NULL, 5033 pd2.ip_sum, icmpsum, 5034 pd->ip_sum, 0, pd2.af); 5035 5036 switch (pd2.af) { 5037#ifdef INET 5038 case AF_INET: 5039 m_copyback(m, off, ICMP_MINLEN, 5040 (caddr_t)pd->hdr.icmp); 5041 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5042 break; 5043#endif /* INET */ 5044#ifdef INET6 5045 case AF_INET6: 5046 m_copyback(m, off, 5047 sizeof(struct icmp6_hdr), 5048 (caddr_t )pd->hdr.icmp6); 5049 m_copyback(m, ipoff2, sizeof(h2_6), 5050 (caddr_t )&h2_6); 5051 break; 5052#endif /* INET6 */ 5053 } 5054 } 5055 return (PF_PASS); 5056 break; 5057 } 5058 } 5059 } 5060} 5061 5062static int 5063pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5064 struct mbuf *m, struct pf_pdesc *pd) 5065{ 5066 struct pf_state_peer *src, *dst; 5067 struct pf_state_key_cmp key; 5068 5069 bzero(&key, sizeof(key)); 5070 key.af = pd->af; 5071 key.proto = pd->proto; 5072 if (direction == PF_IN) { 5073 PF_ACPY(&key.addr[0], pd->src, key.af); 5074 PF_ACPY(&key.addr[1], pd->dst, key.af); 5075 key.port[0] = key.port[1] = 0; 5076 } else { 5077 PF_ACPY(&key.addr[1], pd->src, key.af); 5078 PF_ACPY(&key.addr[0], pd->dst, key.af); 5079 key.port[1] = key.port[0] = 0; 5080 } 5081 5082 STATE_LOOKUP(kif, &key, direction, *state, pd); 5083 5084 if (direction == (*state)->direction) { 5085 src = &(*state)->src; 5086 dst = &(*state)->dst; 5087 } else { 5088 src = &(*state)->dst; 5089 dst = &(*state)->src; 5090 } 5091 5092 /* update states */ 5093 if (src->state < PFOTHERS_SINGLE) 5094 src->state = PFOTHERS_SINGLE; 5095 if (dst->state == PFOTHERS_SINGLE) 5096 dst->state = PFOTHERS_MULTIPLE; 5097 5098 /* update expire time */ 5099 (*state)->expire = time_uptime; 5100 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5101 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5102 else 5103 (*state)->timeout = PFTM_OTHER_SINGLE; 5104 5105 /* translate source/destination address, if necessary */ 5106 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5107 struct pf_state_key *nk = (*state)->key[pd->didx]; 5108 5109 KASSERT(nk, ("%s: nk is null", __func__)); 5110 KASSERT(pd, ("%s: pd is null", __func__)); 5111 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5112 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5113 switch (pd->af) { 5114#ifdef INET 5115 case AF_INET: 5116 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5117 pf_change_a(&pd->src->v4.s_addr, 5118 pd->ip_sum, 5119 nk->addr[pd->sidx].v4.s_addr, 5120 0); 5121 5122 5123 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5124 pf_change_a(&pd->dst->v4.s_addr, 5125 pd->ip_sum, 5126 nk->addr[pd->didx].v4.s_addr, 5127 0); 5128 5129 break; 5130#endif /* INET */ 5131#ifdef INET6 5132 case AF_INET6: 5133 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5134 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5135 5136 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5137 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5138#endif /* INET6 */ 5139 } 5140 } 5141 return (PF_PASS); 5142} 5143 5144/* 5145 * ipoff and off are measured from the start of the mbuf chain. 5146 * h must be at "ipoff" on the mbuf chain. 5147 */ 5148void * 5149pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5150 u_short *actionp, u_short *reasonp, sa_family_t af) 5151{ 5152 switch (af) { 5153#ifdef INET 5154 case AF_INET: { 5155 struct ip *h = mtod(m, struct ip *); 5156 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5157 5158 if (fragoff) { 5159 if (fragoff >= len) 5160 ACTION_SET(actionp, PF_PASS); 5161 else { 5162 ACTION_SET(actionp, PF_DROP); 5163 REASON_SET(reasonp, PFRES_FRAG); 5164 } 5165 return (NULL); 5166 } 5167 if (m->m_pkthdr.len < off + len || 5168 ntohs(h->ip_len) < off + len) { 5169 ACTION_SET(actionp, PF_DROP); 5170 REASON_SET(reasonp, PFRES_SHORT); 5171 return (NULL); 5172 } 5173 break; 5174 } 5175#endif /* INET */ 5176#ifdef INET6 5177 case AF_INET6: { 5178 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5179 5180 if (m->m_pkthdr.len < off + len || 5181 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5182 (unsigned)(off + len)) { 5183 ACTION_SET(actionp, PF_DROP); 5184 REASON_SET(reasonp, PFRES_SHORT); 5185 return (NULL); 5186 } 5187 break; 5188 } 5189#endif /* INET6 */ 5190 } 5191 m_copydata(m, off, len, p); 5192 return (p); 5193} 5194 5195int 5196pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5197 int rtableid) 5198{ 5199#ifdef RADIX_MPATH 5200 struct radix_node_head *rnh; 5201#endif 5202 struct sockaddr_in *dst; 5203 int ret = 1; 5204 int check_mpath; 5205#ifdef INET6 5206 struct sockaddr_in6 *dst6; 5207 struct route_in6 ro; 5208#else 5209 struct route ro; 5210#endif 5211 struct radix_node *rn; 5212 struct rtentry *rt; 5213 struct ifnet *ifp; 5214 5215 check_mpath = 0; 5216#ifdef RADIX_MPATH 5217 /* XXX: stick to table 0 for now */ 5218 rnh = rt_tables_get_rnh(0, af); 5219 if (rnh != NULL && rn_mpath_capable(rnh)) 5220 check_mpath = 1; 5221#endif 5222 bzero(&ro, sizeof(ro)); 5223 switch (af) { 5224 case AF_INET: 5225 dst = satosin(&ro.ro_dst); 5226 dst->sin_family = AF_INET; 5227 dst->sin_len = sizeof(*dst); 5228 dst->sin_addr = addr->v4; 5229 break; 5230#ifdef INET6 5231 case AF_INET6: 5232 /* 5233 * Skip check for addresses with embedded interface scope, 5234 * as they would always match anyway. 5235 */ 5236 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5237 goto out; 5238 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5239 dst6->sin6_family = AF_INET6; 5240 dst6->sin6_len = sizeof(*dst6); 5241 dst6->sin6_addr = addr->v6; 5242 break; 5243#endif /* INET6 */ 5244 default: 5245 return (0); 5246 } 5247 5248 /* Skip checks for ipsec interfaces */ 5249 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5250 goto out; 5251 5252 switch (af) { 5253#ifdef INET6 5254 case AF_INET6: 5255 in6_rtalloc_ign(&ro, 0, rtableid); 5256 break; 5257#endif 5258#ifdef INET 5259 case AF_INET: 5260 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5261 break; 5262#endif 5263 default: 5264 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5265 break; 5266 } 5267 5268 if (ro.ro_rt != NULL) { 5269 /* No interface given, this is a no-route check */ 5270 if (kif == NULL) 5271 goto out; 5272 5273 if (kif->pfik_ifp == NULL) { 5274 ret = 0; 5275 goto out; 5276 } 5277 5278 /* Perform uRPF check if passed input interface */ 5279 ret = 0; 5280 rn = (struct radix_node *)ro.ro_rt; 5281 do { 5282 rt = (struct rtentry *)rn; 5283 ifp = rt->rt_ifp; 5284 5285 if (kif->pfik_ifp == ifp) 5286 ret = 1; 5287#ifdef RADIX_MPATH 5288 rn = rn_mpath_next(rn); 5289#endif 5290 } while (check_mpath == 1 && rn != NULL && ret == 0); 5291 } else 5292 ret = 0; 5293out: 5294 if (ro.ro_rt != NULL) 5295 RTFREE(ro.ro_rt); 5296 return (ret); 5297} 5298 5299#ifdef INET 5300static void 5301pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5302 struct pf_state *s, struct pf_pdesc *pd) 5303{ 5304 struct mbuf *m0, *m1; 5305 struct sockaddr_in dst; 5306 struct ip *ip; 5307 struct ifnet *ifp = NULL; 5308 struct pf_addr naddr; 5309 struct pf_src_node *sn = NULL; 5310 int error = 0; 5311 uint16_t ip_len, ip_off; 5312 5313 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5314 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5315 __func__)); 5316 5317 if ((pd->pf_mtag == NULL && 5318 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5319 pd->pf_mtag->routed++ > 3) { 5320 m0 = *m; 5321 *m = NULL; 5322 goto bad_locked; 5323 } 5324 5325 if (r->rt == PF_DUPTO) { 5326 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5327 if (s) 5328 PF_STATE_UNLOCK(s); 5329 return; 5330 } 5331 } else { 5332 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5333 if (s) 5334 PF_STATE_UNLOCK(s); 5335 return; 5336 } 5337 m0 = *m; 5338 } 5339 5340 ip = mtod(m0, struct ip *); 5341 5342 bzero(&dst, sizeof(dst)); 5343 dst.sin_family = AF_INET; 5344 dst.sin_len = sizeof(dst); 5345 dst.sin_addr = ip->ip_dst; 5346 5347 if (r->rt == PF_FASTROUTE) { 5348 struct rtentry *rt; 5349 5350 if (s) 5351 PF_STATE_UNLOCK(s); 5352 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5353 if (rt == NULL) { 5354 KMOD_IPSTAT_INC(ips_noroute); 5355 error = EHOSTUNREACH; 5356 goto bad; 5357 } 5358 5359 ifp = rt->rt_ifp; 5360 counter_u64_add(rt->rt_pksent, 1); 5361 5362 if (rt->rt_flags & RTF_GATEWAY) 5363 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5364 RTFREE_LOCKED(rt); 5365 } else { 5366 if (TAILQ_EMPTY(&r->rpool.list)) { 5367 DPFPRINTF(PF_DEBUG_URGENT, 5368 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5369 goto bad_locked; 5370 } 5371 if (s == NULL) { 5372 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5373 &naddr, NULL, &sn); 5374 if (!PF_AZERO(&naddr, AF_INET)) 5375 dst.sin_addr.s_addr = naddr.v4.s_addr; 5376 ifp = r->rpool.cur->kif ? 5377 r->rpool.cur->kif->pfik_ifp : NULL; 5378 } else { 5379 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5380 dst.sin_addr.s_addr = 5381 s->rt_addr.v4.s_addr; 5382 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5383 PF_STATE_UNLOCK(s); 5384 } 5385 } 5386 if (ifp == NULL) 5387 goto bad; 5388 5389 if (oifp != ifp) { 5390 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5391 goto bad; 5392 else if (m0 == NULL) 5393 goto done; 5394 if (m0->m_len < sizeof(struct ip)) { 5395 DPFPRINTF(PF_DEBUG_URGENT, 5396 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5397 goto bad; 5398 } 5399 ip = mtod(m0, struct ip *); 5400 } 5401 5402 if (ifp->if_flags & IFF_LOOPBACK) 5403 m0->m_flags |= M_SKIP_FIREWALL; 5404 5405 ip_len = ntohs(ip->ip_len); 5406 ip_off = ntohs(ip->ip_off); 5407 5408 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5409 m0->m_pkthdr.csum_flags |= CSUM_IP; 5410 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5411 in_delayed_cksum(m0); 5412 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5413 } 5414#ifdef SCTP 5415 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 5416 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5417 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 5418 } 5419#endif 5420 5421 /* 5422 * If small enough for interface, or the interface will take 5423 * care of the fragmentation for us, we can just send directly. 5424 */ 5425 if (ip_len <= ifp->if_mtu || 5426 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5427 ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5428 ip->ip_sum = 0; 5429 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 5430 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5431 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 5432 } 5433 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 5434 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5435 goto done; 5436 } 5437 5438 /* Balk when DF bit is set or the interface didn't support TSO. */ 5439 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5440 error = EMSGSIZE; 5441 KMOD_IPSTAT_INC(ips_cantfrag); 5442 if (r->rt != PF_DUPTO) { 5443 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5444 ifp->if_mtu); 5445 goto done; 5446 } else 5447 goto bad; 5448 } 5449 5450 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 5451 if (error) 5452 goto bad; 5453 5454 for (; m0; m0 = m1) { 5455 m1 = m0->m_nextpkt; 5456 m0->m_nextpkt = NULL; 5457 if (error == 0) { 5458 m_clrprotoflags(m0); 5459 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5460 } else 5461 m_freem(m0); 5462 } 5463 5464 if (error == 0) 5465 KMOD_IPSTAT_INC(ips_fragmented); 5466 5467done: 5468 if (r->rt != PF_DUPTO) 5469 *m = NULL; 5470 return; 5471 5472bad_locked: 5473 if (s) 5474 PF_STATE_UNLOCK(s); 5475bad: 5476 m_freem(m0); 5477 goto done; 5478} 5479#endif /* INET */ 5480 5481#ifdef INET6 5482static void 5483pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5484 struct pf_state *s, struct pf_pdesc *pd) 5485{ 5486 struct mbuf *m0; 5487 struct sockaddr_in6 dst; 5488 struct ip6_hdr *ip6; 5489 struct ifnet *ifp = NULL; 5490 struct pf_addr naddr; 5491 struct pf_src_node *sn = NULL; 5492 5493 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5494 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5495 __func__)); 5496 5497 if ((pd->pf_mtag == NULL && 5498 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5499 pd->pf_mtag->routed++ > 3) { 5500 m0 = *m; 5501 *m = NULL; 5502 goto bad_locked; 5503 } 5504 5505 if (r->rt == PF_DUPTO) { 5506 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5507 if (s) 5508 PF_STATE_UNLOCK(s); 5509 return; 5510 } 5511 } else { 5512 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5513 if (s) 5514 PF_STATE_UNLOCK(s); 5515 return; 5516 } 5517 m0 = *m; 5518 } 5519 5520 ip6 = mtod(m0, struct ip6_hdr *); 5521 5522 bzero(&dst, sizeof(dst)); 5523 dst.sin6_family = AF_INET6; 5524 dst.sin6_len = sizeof(dst); 5525 dst.sin6_addr = ip6->ip6_dst; 5526 5527 /* Cheat. XXX why only in the v6 case??? */ 5528 if (r->rt == PF_FASTROUTE) { 5529 if (s) 5530 PF_STATE_UNLOCK(s); 5531 m0->m_flags |= M_SKIP_FIREWALL; 5532 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5533 *m = NULL; 5534 return; 5535 } 5536 5537 if (TAILQ_EMPTY(&r->rpool.list)) { 5538 DPFPRINTF(PF_DEBUG_URGENT, 5539 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5540 goto bad_locked; 5541 } 5542 if (s == NULL) { 5543 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5544 &naddr, NULL, &sn); 5545 if (!PF_AZERO(&naddr, AF_INET6)) 5546 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5547 &naddr, AF_INET6); 5548 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5549 } else { 5550 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5551 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5552 &s->rt_addr, AF_INET6); 5553 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5554 } 5555 5556 if (s) 5557 PF_STATE_UNLOCK(s); 5558 5559 if (ifp == NULL) 5560 goto bad; 5561 5562 if (oifp != ifp) { 5563 if (pf_test6(PF_FWD, ifp, &m0, NULL) != PF_PASS) 5564 goto bad; 5565 else if (m0 == NULL) 5566 goto done; 5567 if (m0->m_len < sizeof(struct ip6_hdr)) { 5568 DPFPRINTF(PF_DEBUG_URGENT, 5569 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5570 __func__)); 5571 goto bad; 5572 } 5573 ip6 = mtod(m0, struct ip6_hdr *); 5574 } 5575 5576 if (ifp->if_flags & IFF_LOOPBACK) 5577 m0->m_flags |= M_SKIP_FIREWALL; 5578 5579 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 & 5580 ~ifp->if_hwassist) { 5581 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6); 5582 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr)); 5583 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 5584 } 5585 5586 /* 5587 * If the packet is too large for the outgoing interface, 5588 * send back an icmp6 error. 5589 */ 5590 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5591 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5592 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5593 nd6_output(ifp, ifp, m0, &dst, NULL); 5594 else { 5595 in6_ifstat_inc(ifp, ifs6_in_toobig); 5596 if (r->rt != PF_DUPTO) 5597 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5598 else 5599 goto bad; 5600 } 5601 5602done: 5603 if (r->rt != PF_DUPTO) 5604 *m = NULL; 5605 return; 5606 5607bad_locked: 5608 if (s) 5609 PF_STATE_UNLOCK(s); 5610bad: 5611 m_freem(m0); 5612 goto done; 5613} 5614#endif /* INET6 */ 5615 5616/* 5617 * FreeBSD supports cksum offloads for the following drivers. 5618 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5619 * ti(4), txp(4), xl(4) 5620 * 5621 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5622 * network driver performed cksum including pseudo header, need to verify 5623 * csum_data 5624 * CSUM_DATA_VALID : 5625 * network driver performed cksum, needs to additional pseudo header 5626 * cksum computation with partial csum_data(i.e. lack of H/W support for 5627 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5628 * 5629 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5630 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5631 * TCP/UDP layer. 5632 * Also, set csum_data to 0xffff to force cksum validation. 5633 */ 5634static int 5635pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5636{ 5637 u_int16_t sum = 0; 5638 int hw_assist = 0; 5639 struct ip *ip; 5640 5641 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5642 return (1); 5643 if (m->m_pkthdr.len < off + len) 5644 return (1); 5645 5646 switch (p) { 5647 case IPPROTO_TCP: 5648 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5649 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5650 sum = m->m_pkthdr.csum_data; 5651 } else { 5652 ip = mtod(m, struct ip *); 5653 sum = in_pseudo(ip->ip_src.s_addr, 5654 ip->ip_dst.s_addr, htonl((u_short)len + 5655 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5656 } 5657 sum ^= 0xffff; 5658 ++hw_assist; 5659 } 5660 break; 5661 case IPPROTO_UDP: 5662 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5663 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5664 sum = m->m_pkthdr.csum_data; 5665 } else { 5666 ip = mtod(m, struct ip *); 5667 sum = in_pseudo(ip->ip_src.s_addr, 5668 ip->ip_dst.s_addr, htonl((u_short)len + 5669 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5670 } 5671 sum ^= 0xffff; 5672 ++hw_assist; 5673 } 5674 break; 5675 case IPPROTO_ICMP: 5676#ifdef INET6 5677 case IPPROTO_ICMPV6: 5678#endif /* INET6 */ 5679 break; 5680 default: 5681 return (1); 5682 } 5683 5684 if (!hw_assist) { 5685 switch (af) { 5686 case AF_INET: 5687 if (p == IPPROTO_ICMP) { 5688 if (m->m_len < off) 5689 return (1); 5690 m->m_data += off; 5691 m->m_len -= off; 5692 sum = in_cksum(m, len); 5693 m->m_data -= off; 5694 m->m_len += off; 5695 } else { 5696 if (m->m_len < sizeof(struct ip)) 5697 return (1); 5698 sum = in4_cksum(m, p, off, len); 5699 } 5700 break; 5701#ifdef INET6 5702 case AF_INET6: 5703 if (m->m_len < sizeof(struct ip6_hdr)) 5704 return (1); 5705 sum = in6_cksum(m, p, off, len); 5706 break; 5707#endif /* INET6 */ 5708 default: 5709 return (1); 5710 } 5711 } 5712 if (sum) { 5713 switch (p) { 5714 case IPPROTO_TCP: 5715 { 5716 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5717 break; 5718 } 5719 case IPPROTO_UDP: 5720 { 5721 KMOD_UDPSTAT_INC(udps_badsum); 5722 break; 5723 } 5724#ifdef INET 5725 case IPPROTO_ICMP: 5726 { 5727 KMOD_ICMPSTAT_INC(icps_checksum); 5728 break; 5729 } 5730#endif 5731#ifdef INET6 5732 case IPPROTO_ICMPV6: 5733 { 5734 KMOD_ICMP6STAT_INC(icp6s_checksum); 5735 break; 5736 } 5737#endif /* INET6 */ 5738 } 5739 return (1); 5740 } else { 5741 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5742 m->m_pkthdr.csum_flags |= 5743 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5744 m->m_pkthdr.csum_data = 0xffff; 5745 } 5746 } 5747 return (0); 5748} 5749 5750 5751#ifdef INET 5752int 5753pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5754{ 5755 struct pfi_kif *kif; 5756 u_short action, reason = 0, log = 0; 5757 struct mbuf *m = *m0; 5758 struct ip *h = NULL; 5759 struct m_tag *ipfwtag; 5760 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5761 struct pf_state *s = NULL; 5762 struct pf_ruleset *ruleset = NULL; 5763 struct pf_pdesc pd; 5764 int off, dirndx, pqid = 0; 5765 5766 M_ASSERTPKTHDR(m); 5767 5768 if (!V_pf_status.running) 5769 return (PF_PASS); 5770 5771 memset(&pd, 0, sizeof(pd)); 5772 5773 kif = (struct pfi_kif *)ifp->if_pf_kif; 5774 5775 if (kif == NULL) { 5776 DPFPRINTF(PF_DEBUG_URGENT, 5777 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5778 return (PF_DROP); 5779 } 5780 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5781 return (PF_PASS); 5782 5783 if (m->m_flags & M_SKIP_FIREWALL) 5784 return (PF_PASS); 5785 5786 pd.pf_mtag = pf_find_mtag(m); 5787 5788 PF_RULES_RLOCK(); 5789 5790 if (ip_divert_ptr != NULL && 5791 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5792 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5793 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5794 if (pd.pf_mtag == NULL && 5795 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5796 action = PF_DROP; 5797 goto done; 5798 } 5799 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5800 m_tag_delete(m, ipfwtag); 5801 } 5802 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5803 m->m_flags |= M_FASTFWD_OURS; 5804 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5805 } 5806 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5807 /* We do IP header normalization and packet reassembly here */ 5808 action = PF_DROP; 5809 goto done; 5810 } 5811 m = *m0; /* pf_normalize messes with m0 */ 5812 h = mtod(m, struct ip *); 5813 5814 off = h->ip_hl << 2; 5815 if (off < (int)sizeof(struct ip)) { 5816 action = PF_DROP; 5817 REASON_SET(&reason, PFRES_SHORT); 5818 log = 1; 5819 goto done; 5820 } 5821 5822 pd.src = (struct pf_addr *)&h->ip_src; 5823 pd.dst = (struct pf_addr *)&h->ip_dst; 5824 pd.sport = pd.dport = NULL; 5825 pd.ip_sum = &h->ip_sum; 5826 pd.proto_sum = NULL; 5827 pd.proto = h->ip_p; 5828 pd.dir = dir; 5829 pd.sidx = (dir == PF_IN) ? 0 : 1; 5830 pd.didx = (dir == PF_IN) ? 1 : 0; 5831 pd.af = AF_INET; 5832 pd.tos = h->ip_tos; 5833 pd.tot_len = ntohs(h->ip_len); 5834 5835 /* handle fragments that didn't get reassembled by normalization */ 5836 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5837 action = pf_test_fragment(&r, dir, kif, m, h, 5838 &pd, &a, &ruleset); 5839 goto done; 5840 } 5841 5842 switch (h->ip_p) { 5843 5844 case IPPROTO_TCP: { 5845 struct tcphdr th; 5846 5847 pd.hdr.tcp = &th; 5848 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5849 &action, &reason, AF_INET)) { 5850 log = action != PF_PASS; 5851 goto done; 5852 } 5853 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5854 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5855 pqid = 1; 5856 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5857 if (action == PF_DROP) 5858 goto done; 5859 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5860 &reason); 5861 if (action == PF_PASS) { 5862 if (pfsync_update_state_ptr != NULL) 5863 pfsync_update_state_ptr(s); 5864 r = s->rule.ptr; 5865 a = s->anchor.ptr; 5866 log = s->log; 5867 } else if (s == NULL) 5868 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5869 &a, &ruleset, inp); 5870 break; 5871 } 5872 5873 case IPPROTO_UDP: { 5874 struct udphdr uh; 5875 5876 pd.hdr.udp = &uh; 5877 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5878 &action, &reason, AF_INET)) { 5879 log = action != PF_PASS; 5880 goto done; 5881 } 5882 if (uh.uh_dport == 0 || 5883 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5884 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5885 action = PF_DROP; 5886 REASON_SET(&reason, PFRES_SHORT); 5887 goto done; 5888 } 5889 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5890 if (action == PF_PASS) { 5891 if (pfsync_update_state_ptr != NULL) 5892 pfsync_update_state_ptr(s); 5893 r = s->rule.ptr; 5894 a = s->anchor.ptr; 5895 log = s->log; 5896 } else if (s == NULL) 5897 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5898 &a, &ruleset, inp); 5899 break; 5900 } 5901 5902 case IPPROTO_ICMP: { 5903 struct icmp ih; 5904 5905 pd.hdr.icmp = &ih; 5906 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5907 &action, &reason, AF_INET)) { 5908 log = action != PF_PASS; 5909 goto done; 5910 } 5911 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5912 &reason); 5913 if (action == PF_PASS) { 5914 if (pfsync_update_state_ptr != NULL) 5915 pfsync_update_state_ptr(s); 5916 r = s->rule.ptr; 5917 a = s->anchor.ptr; 5918 log = s->log; 5919 } else if (s == NULL) 5920 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5921 &a, &ruleset, inp); 5922 break; 5923 } 5924 5925#ifdef INET6 5926 case IPPROTO_ICMPV6: { 5927 action = PF_DROP; 5928 DPFPRINTF(PF_DEBUG_MISC, 5929 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5930 goto done; 5931 } 5932#endif 5933 5934 default: 5935 action = pf_test_state_other(&s, dir, kif, m, &pd); 5936 if (action == PF_PASS) { 5937 if (pfsync_update_state_ptr != NULL) 5938 pfsync_update_state_ptr(s); 5939 r = s->rule.ptr; 5940 a = s->anchor.ptr; 5941 log = s->log; 5942 } else if (s == NULL) 5943 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5944 &a, &ruleset, inp); 5945 break; 5946 } 5947 5948done: 5949 PF_RULES_RUNLOCK(); 5950 if (action == PF_PASS && h->ip_hl > 5 && 5951 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 5952 action = PF_DROP; 5953 REASON_SET(&reason, PFRES_IPOPTIONS); 5954 log = r->log; 5955 DPFPRINTF(PF_DEBUG_MISC, 5956 ("pf: dropping packet with ip options\n")); 5957 } 5958 5959 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 5960 action = PF_DROP; 5961 REASON_SET(&reason, PFRES_MEMORY); 5962 } 5963 if (r->rtableid >= 0) 5964 M_SETFIB(m, r->rtableid); 5965 5966#ifdef ALTQ 5967 if (action == PF_PASS && r->qid) { 5968 if (pd.pf_mtag == NULL && 5969 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5970 action = PF_DROP; 5971 REASON_SET(&reason, PFRES_MEMORY); 5972 } else { 5973 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5974 pd.pf_mtag->qid = r->pqid; 5975 else 5976 pd.pf_mtag->qid = r->qid; 5977 /* Add hints for ecn. */ 5978 pd.pf_mtag->hdr = h; 5979 } 5980 5981 } 5982#endif /* ALTQ */ 5983 5984 /* 5985 * connections redirected to loopback should not match sockets 5986 * bound specifically to loopback due to security implications, 5987 * see tcp_input() and in_pcblookup_listen(). 5988 */ 5989 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5990 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5991 (s->nat_rule.ptr->action == PF_RDR || 5992 s->nat_rule.ptr->action == PF_BINAT) && 5993 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5994 m->m_flags |= M_SKIP_FIREWALL; 5995 5996 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 5997 !PACKET_LOOPED(&pd)) { 5998 5999 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 6000 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 6001 if (ipfwtag != NULL) { 6002 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 6003 ntohs(r->divert.port); 6004 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 6005 6006 if (s) 6007 PF_STATE_UNLOCK(s); 6008 6009 m_tag_prepend(m, ipfwtag); 6010 if (m->m_flags & M_FASTFWD_OURS) { 6011 if (pd.pf_mtag == NULL && 6012 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6013 action = PF_DROP; 6014 REASON_SET(&reason, PFRES_MEMORY); 6015 log = 1; 6016 DPFPRINTF(PF_DEBUG_MISC, 6017 ("pf: failed to allocate tag\n")); 6018 } else { 6019 pd.pf_mtag->flags |= 6020 PF_FASTFWD_OURS_PRESENT; 6021 m->m_flags &= ~M_FASTFWD_OURS; 6022 } 6023 } 6024 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 6025 *m0 = NULL; 6026 6027 return (action); 6028 } else { 6029 /* XXX: ipfw has the same behaviour! */ 6030 action = PF_DROP; 6031 REASON_SET(&reason, PFRES_MEMORY); 6032 log = 1; 6033 DPFPRINTF(PF_DEBUG_MISC, 6034 ("pf: failed to allocate divert tag\n")); 6035 } 6036 } 6037 6038 if (log) { 6039 struct pf_rule *lr; 6040 6041 if (s != NULL && s->nat_rule.ptr != NULL && 6042 s->nat_rule.ptr->log & PF_LOG_ALL) 6043 lr = s->nat_rule.ptr; 6044 else 6045 lr = r; 6046 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 6047 (s == NULL)); 6048 } 6049 6050 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6051 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6052 6053 if (action == PF_PASS || r->action == PF_DROP) { 6054 dirndx = (dir == PF_OUT); 6055 r->packets[dirndx]++; 6056 r->bytes[dirndx] += pd.tot_len; 6057 if (a != NULL) { 6058 a->packets[dirndx]++; 6059 a->bytes[dirndx] += pd.tot_len; 6060 } 6061 if (s != NULL) { 6062 if (s->nat_rule.ptr != NULL) { 6063 s->nat_rule.ptr->packets[dirndx]++; 6064 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6065 } 6066 if (s->src_node != NULL) { 6067 s->src_node->packets[dirndx]++; 6068 s->src_node->bytes[dirndx] += pd.tot_len; 6069 } 6070 if (s->nat_src_node != NULL) { 6071 s->nat_src_node->packets[dirndx]++; 6072 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6073 } 6074 dirndx = (dir == s->direction) ? 0 : 1; 6075 s->packets[dirndx]++; 6076 s->bytes[dirndx] += pd.tot_len; 6077 } 6078 tr = r; 6079 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6080 if (nr != NULL && r == &V_pf_default_rule) 6081 tr = nr; 6082 if (tr->src.addr.type == PF_ADDR_TABLE) 6083 pfr_update_stats(tr->src.addr.p.tbl, 6084 (s == NULL) ? pd.src : 6085 &s->key[(s->direction == PF_IN)]-> 6086 addr[(s->direction == PF_OUT)], 6087 pd.af, pd.tot_len, dir == PF_OUT, 6088 r->action == PF_PASS, tr->src.neg); 6089 if (tr->dst.addr.type == PF_ADDR_TABLE) 6090 pfr_update_stats(tr->dst.addr.p.tbl, 6091 (s == NULL) ? pd.dst : 6092 &s->key[(s->direction == PF_IN)]-> 6093 addr[(s->direction == PF_IN)], 6094 pd.af, pd.tot_len, dir == PF_OUT, 6095 r->action == PF_PASS, tr->dst.neg); 6096 } 6097 6098 switch (action) { 6099 case PF_SYNPROXY_DROP: 6100 m_freem(*m0); 6101 case PF_DEFER: 6102 *m0 = NULL; 6103 action = PF_PASS; 6104 break; 6105 case PF_DROP: 6106 m_freem(*m0); 6107 *m0 = NULL; 6108 break; 6109 default: 6110 /* pf_route() returns unlocked. */ 6111 if (r->rt) { 6112 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6113 return (action); 6114 } 6115 break; 6116 } 6117 if (s) 6118 PF_STATE_UNLOCK(s); 6119 6120 return (action); 6121} 6122#endif /* INET */ 6123 6124#ifdef INET6 6125int 6126pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6127{ 6128 struct pfi_kif *kif; 6129 u_short action, reason = 0, log = 0; 6130 struct mbuf *m = *m0, *n = NULL; 6131 struct m_tag *mtag; 6132 struct ip6_hdr *h = NULL; 6133 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6134 struct pf_state *s = NULL; 6135 struct pf_ruleset *ruleset = NULL; 6136 struct pf_pdesc pd; 6137 int off, terminal = 0, dirndx, rh_cnt = 0; 6138 int fwdir = dir; 6139 6140 M_ASSERTPKTHDR(m); 6141 6142 /* Detect packet forwarding. 6143 * If the input interface is different from the output interface we're 6144 * forwarding. 6145 * We do need to be careful about bridges. If the 6146 * net.link.bridge.pfil_bridge sysctl is set we can be filtering on a 6147 * bridge, so if the input interface is a bridge member and the output 6148 * interface is its bridge we're not actually forwarding but bridging. 6149 */ 6150 if (dir == PF_OUT && m->m_pkthdr.rcvif && ifp != m->m_pkthdr.rcvif 6151 && (m->m_pkthdr.rcvif->if_bridge == NULL 6152 || m->m_pkthdr.rcvif->if_bridge != ifp->if_softc)) 6153 fwdir = PF_FWD; 6154 6155 if (!V_pf_status.running) 6156 return (PF_PASS); 6157 6158 memset(&pd, 0, sizeof(pd)); 6159 pd.pf_mtag = pf_find_mtag(m); 6160 6161 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6162 return (PF_PASS); 6163 6164 kif = (struct pfi_kif *)ifp->if_pf_kif; 6165 if (kif == NULL) { 6166 DPFPRINTF(PF_DEBUG_URGENT, 6167 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6168 return (PF_DROP); 6169 } 6170 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6171 return (PF_PASS); 6172 6173 if (m->m_flags & M_SKIP_FIREWALL) 6174 return (PF_PASS); 6175 6176 PF_RULES_RLOCK(); 6177 6178 /* We do IP header normalization and packet reassembly here */ 6179 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6180 action = PF_DROP; 6181 goto done; 6182 } 6183 m = *m0; /* pf_normalize messes with m0 */ 6184 h = mtod(m, struct ip6_hdr *); 6185 6186#if 1 6187 /* 6188 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6189 * will do something bad, so drop the packet for now. 6190 */ 6191 if (htons(h->ip6_plen) == 0) { 6192 action = PF_DROP; 6193 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6194 goto done; 6195 } 6196#endif 6197 6198 pd.src = (struct pf_addr *)&h->ip6_src; 6199 pd.dst = (struct pf_addr *)&h->ip6_dst; 6200 pd.sport = pd.dport = NULL; 6201 pd.ip_sum = NULL; 6202 pd.proto_sum = NULL; 6203 pd.dir = dir; 6204 pd.sidx = (dir == PF_IN) ? 0 : 1; 6205 pd.didx = (dir == PF_IN) ? 1 : 0; 6206 pd.af = AF_INET6; 6207 pd.tos = 0; 6208 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6209 6210 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6211 pd.proto = h->ip6_nxt; 6212 do { 6213 switch (pd.proto) { 6214 case IPPROTO_FRAGMENT: 6215 action = pf_test_fragment(&r, dir, kif, m, h, 6216 &pd, &a, &ruleset); 6217 if (action == PF_DROP) 6218 REASON_SET(&reason, PFRES_FRAG); 6219 goto done; 6220 case IPPROTO_ROUTING: { 6221 struct ip6_rthdr rthdr; 6222 6223 if (rh_cnt++) { 6224 DPFPRINTF(PF_DEBUG_MISC, 6225 ("pf: IPv6 more than one rthdr\n")); 6226 action = PF_DROP; 6227 REASON_SET(&reason, PFRES_IPOPTIONS); 6228 log = 1; 6229 goto done; 6230 } 6231 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6232 &reason, pd.af)) { 6233 DPFPRINTF(PF_DEBUG_MISC, 6234 ("pf: IPv6 short rthdr\n")); 6235 action = PF_DROP; 6236 REASON_SET(&reason, PFRES_SHORT); 6237 log = 1; 6238 goto done; 6239 } 6240 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6241 DPFPRINTF(PF_DEBUG_MISC, 6242 ("pf: IPv6 rthdr0\n")); 6243 action = PF_DROP; 6244 REASON_SET(&reason, PFRES_IPOPTIONS); 6245 log = 1; 6246 goto done; 6247 } 6248 /* FALLTHROUGH */ 6249 } 6250 case IPPROTO_AH: 6251 case IPPROTO_HOPOPTS: 6252 case IPPROTO_DSTOPTS: { 6253 /* get next header and header length */ 6254 struct ip6_ext opt6; 6255 6256 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6257 NULL, &reason, pd.af)) { 6258 DPFPRINTF(PF_DEBUG_MISC, 6259 ("pf: IPv6 short opt\n")); 6260 action = PF_DROP; 6261 log = 1; 6262 goto done; 6263 } 6264 if (pd.proto == IPPROTO_AH) 6265 off += (opt6.ip6e_len + 2) * 4; 6266 else 6267 off += (opt6.ip6e_len + 1) * 8; 6268 pd.proto = opt6.ip6e_nxt; 6269 /* goto the next header */ 6270 break; 6271 } 6272 default: 6273 terminal++; 6274 break; 6275 } 6276 } while (!terminal); 6277 6278 /* if there's no routing header, use unmodified mbuf for checksumming */ 6279 if (!n) 6280 n = m; 6281 6282 switch (pd.proto) { 6283 6284 case IPPROTO_TCP: { 6285 struct tcphdr th; 6286 6287 pd.hdr.tcp = &th; 6288 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6289 &action, &reason, AF_INET6)) { 6290 log = action != PF_PASS; 6291 goto done; 6292 } 6293 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6294 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6295 if (action == PF_DROP) 6296 goto done; 6297 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6298 &reason); 6299 if (action == PF_PASS) { 6300 if (pfsync_update_state_ptr != NULL) 6301 pfsync_update_state_ptr(s); 6302 r = s->rule.ptr; 6303 a = s->anchor.ptr; 6304 log = s->log; 6305 } else if (s == NULL) 6306 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6307 &a, &ruleset, inp); 6308 break; 6309 } 6310 6311 case IPPROTO_UDP: { 6312 struct udphdr uh; 6313 6314 pd.hdr.udp = &uh; 6315 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6316 &action, &reason, AF_INET6)) { 6317 log = action != PF_PASS; 6318 goto done; 6319 } 6320 if (uh.uh_dport == 0 || 6321 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6322 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6323 action = PF_DROP; 6324 REASON_SET(&reason, PFRES_SHORT); 6325 goto done; 6326 } 6327 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6328 if (action == PF_PASS) { 6329 if (pfsync_update_state_ptr != NULL) 6330 pfsync_update_state_ptr(s); 6331 r = s->rule.ptr; 6332 a = s->anchor.ptr; 6333 log = s->log; 6334 } else if (s == NULL) 6335 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6336 &a, &ruleset, inp); 6337 break; 6338 } 6339 6340 case IPPROTO_ICMP: { 6341 action = PF_DROP; 6342 DPFPRINTF(PF_DEBUG_MISC, 6343 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6344 goto done; 6345 } 6346 6347 case IPPROTO_ICMPV6: { 6348 struct icmp6_hdr ih; 6349 6350 pd.hdr.icmp6 = &ih; 6351 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6352 &action, &reason, AF_INET6)) { 6353 log = action != PF_PASS; 6354 goto done; 6355 } 6356 action = pf_test_state_icmp(&s, dir, kif, 6357 m, off, h, &pd, &reason); 6358 if (action == PF_PASS) { 6359 if (pfsync_update_state_ptr != NULL) 6360 pfsync_update_state_ptr(s); 6361 r = s->rule.ptr; 6362 a = s->anchor.ptr; 6363 log = s->log; 6364 } else if (s == NULL) 6365 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6366 &a, &ruleset, inp); 6367 break; 6368 } 6369 6370 default: 6371 action = pf_test_state_other(&s, dir, kif, m, &pd); 6372 if (action == PF_PASS) { 6373 if (pfsync_update_state_ptr != NULL) 6374 pfsync_update_state_ptr(s); 6375 r = s->rule.ptr; 6376 a = s->anchor.ptr; 6377 log = s->log; 6378 } else if (s == NULL) 6379 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6380 &a, &ruleset, inp); 6381 break; 6382 } 6383 6384done: 6385 PF_RULES_RUNLOCK(); 6386 if (n != m) { 6387 m_freem(n); 6388 n = NULL; 6389 } 6390 6391 /* handle dangerous IPv6 extension headers. */ 6392 if (action == PF_PASS && rh_cnt && 6393 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6394 action = PF_DROP; 6395 REASON_SET(&reason, PFRES_IPOPTIONS); 6396 log = r->log; 6397 DPFPRINTF(PF_DEBUG_MISC, 6398 ("pf: dropping packet with dangerous v6 headers\n")); 6399 } 6400 6401 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6402 action = PF_DROP; 6403 REASON_SET(&reason, PFRES_MEMORY); 6404 } 6405 if (r->rtableid >= 0) 6406 M_SETFIB(m, r->rtableid); 6407 6408#ifdef ALTQ 6409 if (action == PF_PASS && r->qid) { 6410 if (pd.pf_mtag == NULL && 6411 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6412 action = PF_DROP; 6413 REASON_SET(&reason, PFRES_MEMORY); 6414 } else { 6415 if (pd.tos & IPTOS_LOWDELAY) 6416 pd.pf_mtag->qid = r->pqid; 6417 else 6418 pd.pf_mtag->qid = r->qid; 6419 /* Add hints for ecn. */ 6420 pd.pf_mtag->hdr = h; 6421 } 6422 } 6423#endif /* ALTQ */ 6424 6425 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6426 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6427 (s->nat_rule.ptr->action == PF_RDR || 6428 s->nat_rule.ptr->action == PF_BINAT) && 6429 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6430 m->m_flags |= M_SKIP_FIREWALL; 6431 6432 /* XXX: Anybody working on it?! */ 6433 if (r->divert.port) 6434 printf("pf: divert(9) is not supported for IPv6\n"); 6435 6436 if (log) { 6437 struct pf_rule *lr; 6438 6439 if (s != NULL && s->nat_rule.ptr != NULL && 6440 s->nat_rule.ptr->log & PF_LOG_ALL) 6441 lr = s->nat_rule.ptr; 6442 else 6443 lr = r; 6444 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6445 &pd, (s == NULL)); 6446 } 6447 6448 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6449 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6450 6451 if (action == PF_PASS || r->action == PF_DROP) { 6452 dirndx = (dir == PF_OUT); 6453 r->packets[dirndx]++; 6454 r->bytes[dirndx] += pd.tot_len; 6455 if (a != NULL) { 6456 a->packets[dirndx]++; 6457 a->bytes[dirndx] += pd.tot_len; 6458 } 6459 if (s != NULL) { 6460 if (s->nat_rule.ptr != NULL) { 6461 s->nat_rule.ptr->packets[dirndx]++; 6462 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6463 } 6464 if (s->src_node != NULL) { 6465 s->src_node->packets[dirndx]++; 6466 s->src_node->bytes[dirndx] += pd.tot_len; 6467 } 6468 if (s->nat_src_node != NULL) { 6469 s->nat_src_node->packets[dirndx]++; 6470 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6471 } 6472 dirndx = (dir == s->direction) ? 0 : 1; 6473 s->packets[dirndx]++; 6474 s->bytes[dirndx] += pd.tot_len; 6475 } 6476 tr = r; 6477 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6478 if (nr != NULL && r == &V_pf_default_rule) 6479 tr = nr; 6480 if (tr->src.addr.type == PF_ADDR_TABLE) 6481 pfr_update_stats(tr->src.addr.p.tbl, 6482 (s == NULL) ? pd.src : 6483 &s->key[(s->direction == PF_IN)]->addr[0], 6484 pd.af, pd.tot_len, dir == PF_OUT, 6485 r->action == PF_PASS, tr->src.neg); 6486 if (tr->dst.addr.type == PF_ADDR_TABLE) 6487 pfr_update_stats(tr->dst.addr.p.tbl, 6488 (s == NULL) ? pd.dst : 6489 &s->key[(s->direction == PF_IN)]->addr[1], 6490 pd.af, pd.tot_len, dir == PF_OUT, 6491 r->action == PF_PASS, tr->dst.neg); 6492 } 6493 6494 switch (action) { 6495 case PF_SYNPROXY_DROP: 6496 m_freem(*m0); 6497 case PF_DEFER: 6498 *m0 = NULL; 6499 action = PF_PASS; 6500 break; 6501 case PF_DROP: 6502 m_freem(*m0); 6503 *m0 = NULL; 6504 break; 6505 default: 6506 /* pf_route6() returns unlocked. */ 6507 if (r->rt) { 6508 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6509 return (action); 6510 } 6511 break; 6512 } 6513 6514 if (s) 6515 PF_STATE_UNLOCK(s); 6516 6517 /* If reassembled packet passed, create new fragments. */ 6518 if (action == PF_PASS && *m0 && fwdir == PF_FWD && 6519 (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL) 6520 action = pf_refragment6(ifp, m0, mtag); 6521 6522 return (action); 6523} 6524#endif /* INET6 */ 6525