pf.c revision 270574
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 270574 2014-08-25 15:40:37Z glebius $"); 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 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 void pf_set_rt_ifp(struct pf_state *, 269 struct pf_addr *); 270static int pf_check_proto_cksum(struct mbuf *, int, int, 271 u_int8_t, sa_family_t); 272static void pf_print_state_parts(struct pf_state *, 273 struct pf_state_key *, struct pf_state_key *); 274static int pf_addr_wrap_neq(struct pf_addr_wrap *, 275 struct pf_addr_wrap *); 276static struct pf_state *pf_find_state(struct pfi_kif *, 277 struct pf_state_key_cmp *, u_int); 278static int pf_src_connlimit(struct pf_state **); 279static void pf_overload_task(void *v, int pending); 280static int pf_insert_src_node(struct pf_src_node **, 281 struct pf_rule *, struct pf_addr *, sa_family_t); 282static u_int pf_purge_expired_states(u_int, int); 283static void pf_purge_unlinked_rules(void); 284static int pf_mtag_uminit(void *, int, int); 285static void pf_mtag_free(struct m_tag *); 286#ifdef INET 287static void pf_route(struct mbuf **, struct pf_rule *, int, 288 struct ifnet *, struct pf_state *, 289 struct pf_pdesc *); 290#endif /* INET */ 291#ifdef INET6 292static void pf_change_a6(struct pf_addr *, u_int16_t *, 293 struct pf_addr *, u_int8_t); 294static void pf_route6(struct mbuf **, struct pf_rule *, int, 295 struct ifnet *, struct pf_state *, 296 struct pf_pdesc *); 297#endif /* INET6 */ 298 299int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 300 301VNET_DECLARE(int, pf_end_threads); 302 303VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 304 305#define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 306 (pd)->pf_mtag->flags & PF_PACKET_LOOPED) 307 308#define STATE_LOOKUP(i, k, d, s, pd) \ 309 do { \ 310 (s) = pf_find_state((i), (k), (d)); \ 311 if ((s) == NULL) \ 312 return (PF_DROP); \ 313 if (PACKET_LOOPED(pd)) \ 314 return (PF_PASS); \ 315 if ((d) == PF_OUT && \ 316 (((s)->rule.ptr->rt == PF_ROUTETO && \ 317 (s)->rule.ptr->direction == PF_OUT) || \ 318 ((s)->rule.ptr->rt == PF_REPLYTO && \ 319 (s)->rule.ptr->direction == PF_IN)) && \ 320 (s)->rt_kif != NULL && \ 321 (s)->rt_kif != (i)) \ 322 return (PF_PASS); \ 323 } while (0) 324 325#define BOUND_IFACE(r, k) \ 326 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 327 328#define STATE_INC_COUNTERS(s) \ 329 do { \ 330 counter_u64_add(s->rule.ptr->states_cur, 1); \ 331 counter_u64_add(s->rule.ptr->states_tot, 1); \ 332 if (s->anchor.ptr != NULL) { \ 333 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 334 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 335 } \ 336 if (s->nat_rule.ptr != NULL) { \ 337 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 338 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 339 } \ 340 } while (0) 341 342#define STATE_DEC_COUNTERS(s) \ 343 do { \ 344 if (s->nat_rule.ptr != NULL) \ 345 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 346 if (s->anchor.ptr != NULL) \ 347 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 348 counter_u64_add(s->rule.ptr->states_cur, -1); \ 349 } while (0) 350 351static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 352VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 353VNET_DEFINE(struct pf_idhash *, pf_idhash); 354VNET_DEFINE(u_long, pf_hashmask); 355VNET_DEFINE(struct pf_srchash *, pf_srchash); 356VNET_DEFINE(u_long, pf_srchashmask); 357 358SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)"); 359 360VNET_DEFINE(u_long, pf_hashsize); 361#define V_pf_hashsize VNET(pf_hashsize) 362SYSCTL_VNET_UINT(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 363 &VNET_NAME(pf_hashsize), 0, "Size of pf(4) states hashtable"); 364 365VNET_DEFINE(u_long, pf_srchashsize); 366#define V_pf_srchashsize VNET(pf_srchashsize) 367SYSCTL_VNET_UINT(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 368 &VNET_NAME(pf_srchashsize), 0, "Size of pf(4) source nodes hashtable"); 369 370VNET_DEFINE(void *, pf_swi_cookie); 371 372VNET_DEFINE(uint32_t, pf_hashseed); 373#define V_pf_hashseed VNET(pf_hashseed) 374 375static __inline uint32_t 376pf_hashkey(struct pf_state_key *sk) 377{ 378 uint32_t h; 379 380 h = jenkins_hash32((uint32_t *)sk, 381 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 382 V_pf_hashseed); 383 384 return (h & V_pf_hashmask); 385} 386 387static __inline uint32_t 388pf_hashsrc(struct pf_addr *addr, sa_family_t af) 389{ 390 uint32_t h; 391 392 switch (af) { 393 case AF_INET: 394 h = jenkins_hash32((uint32_t *)&addr->v4, 395 sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed); 396 break; 397 case AF_INET6: 398 h = jenkins_hash32((uint32_t *)&addr->v6, 399 sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed); 400 break; 401 default: 402 panic("%s: unknown address family %u", __func__, af); 403 } 404 405 return (h & V_pf_srchashmask); 406} 407 408#ifdef INET6 409void 410pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 411{ 412 switch (af) { 413#ifdef INET 414 case AF_INET: 415 dst->addr32[0] = src->addr32[0]; 416 break; 417#endif /* INET */ 418 case AF_INET6: 419 dst->addr32[0] = src->addr32[0]; 420 dst->addr32[1] = src->addr32[1]; 421 dst->addr32[2] = src->addr32[2]; 422 dst->addr32[3] = src->addr32[3]; 423 break; 424 } 425} 426#endif /* INET6 */ 427 428static void 429pf_init_threshold(struct pf_threshold *threshold, 430 u_int32_t limit, u_int32_t seconds) 431{ 432 threshold->limit = limit * PF_THRESHOLD_MULT; 433 threshold->seconds = seconds; 434 threshold->count = 0; 435 threshold->last = time_uptime; 436} 437 438static void 439pf_add_threshold(struct pf_threshold *threshold) 440{ 441 u_int32_t t = time_uptime, diff = t - threshold->last; 442 443 if (diff >= threshold->seconds) 444 threshold->count = 0; 445 else 446 threshold->count -= threshold->count * diff / 447 threshold->seconds; 448 threshold->count += PF_THRESHOLD_MULT; 449 threshold->last = t; 450} 451 452static int 453pf_check_threshold(struct pf_threshold *threshold) 454{ 455 return (threshold->count > threshold->limit); 456} 457 458static int 459pf_src_connlimit(struct pf_state **state) 460{ 461 struct pf_overload_entry *pfoe; 462 int bad = 0; 463 464 PF_STATE_LOCK_ASSERT(*state); 465 466 (*state)->src_node->conn++; 467 (*state)->src.tcp_est = 1; 468 pf_add_threshold(&(*state)->src_node->conn_rate); 469 470 if ((*state)->rule.ptr->max_src_conn && 471 (*state)->rule.ptr->max_src_conn < 472 (*state)->src_node->conn) { 473 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 474 bad++; 475 } 476 477 if ((*state)->rule.ptr->max_src_conn_rate.limit && 478 pf_check_threshold(&(*state)->src_node->conn_rate)) { 479 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 480 bad++; 481 } 482 483 if (!bad) 484 return (0); 485 486 /* Kill this state. */ 487 (*state)->timeout = PFTM_PURGE; 488 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 489 490 if ((*state)->rule.ptr->overload_tbl == NULL) 491 return (1); 492 493 /* Schedule overloading and flushing task. */ 494 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 495 if (pfoe == NULL) 496 return (1); /* too bad :( */ 497 498 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 499 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 500 pfoe->rule = (*state)->rule.ptr; 501 pfoe->dir = (*state)->direction; 502 PF_OVERLOADQ_LOCK(); 503 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 504 PF_OVERLOADQ_UNLOCK(); 505 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 506 507 return (1); 508} 509 510static void 511pf_overload_task(void *v, int pending) 512{ 513 struct pf_overload_head queue; 514 struct pfr_addr p; 515 struct pf_overload_entry *pfoe, *pfoe1; 516 uint32_t killed = 0; 517 518 CURVNET_SET((struct vnet *)v); 519 520 PF_OVERLOADQ_LOCK(); 521 queue = V_pf_overloadqueue; 522 SLIST_INIT(&V_pf_overloadqueue); 523 PF_OVERLOADQ_UNLOCK(); 524 525 bzero(&p, sizeof(p)); 526 SLIST_FOREACH(pfoe, &queue, next) { 527 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 528 if (V_pf_status.debug >= PF_DEBUG_MISC) { 529 printf("%s: blocking address ", __func__); 530 pf_print_host(&pfoe->addr, 0, pfoe->af); 531 printf("\n"); 532 } 533 534 p.pfra_af = pfoe->af; 535 switch (pfoe->af) { 536#ifdef INET 537 case AF_INET: 538 p.pfra_net = 32; 539 p.pfra_ip4addr = pfoe->addr.v4; 540 break; 541#endif 542#ifdef INET6 543 case AF_INET6: 544 p.pfra_net = 128; 545 p.pfra_ip6addr = pfoe->addr.v6; 546 break; 547#endif 548 } 549 550 PF_RULES_WLOCK(); 551 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 552 PF_RULES_WUNLOCK(); 553 } 554 555 /* 556 * Remove those entries, that don't need flushing. 557 */ 558 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 559 if (pfoe->rule->flush == 0) { 560 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 561 free(pfoe, M_PFTEMP); 562 } else 563 counter_u64_add( 564 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 565 566 /* If nothing to flush, return. */ 567 if (SLIST_EMPTY(&queue)) { 568 CURVNET_RESTORE(); 569 return; 570 } 571 572 for (int i = 0; i <= V_pf_hashmask; i++) { 573 struct pf_idhash *ih = &V_pf_idhash[i]; 574 struct pf_state_key *sk; 575 struct pf_state *s; 576 577 PF_HASHROW_LOCK(ih); 578 LIST_FOREACH(s, &ih->states, entry) { 579 sk = s->key[PF_SK_WIRE]; 580 SLIST_FOREACH(pfoe, &queue, next) 581 if (sk->af == pfoe->af && 582 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 583 pfoe->rule == s->rule.ptr) && 584 ((pfoe->dir == PF_OUT && 585 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 586 (pfoe->dir == PF_IN && 587 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 588 s->timeout = PFTM_PURGE; 589 s->src.state = s->dst.state = TCPS_CLOSED; 590 killed++; 591 } 592 } 593 PF_HASHROW_UNLOCK(ih); 594 } 595 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 596 free(pfoe, M_PFTEMP); 597 if (V_pf_status.debug >= PF_DEBUG_MISC) 598 printf("%s: %u states killed", __func__, killed); 599 600 CURVNET_RESTORE(); 601} 602 603/* 604 * Can return locked on failure, so that we can consistently 605 * allocate and insert a new one. 606 */ 607struct pf_src_node * 608pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 609 int returnlocked) 610{ 611 struct pf_srchash *sh; 612 struct pf_src_node *n; 613 614 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 615 616 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 617 PF_HASHROW_LOCK(sh); 618 LIST_FOREACH(n, &sh->nodes, entry) 619 if (n->rule.ptr == rule && n->af == af && 620 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 621 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 622 break; 623 if (n != NULL || returnlocked == 0) 624 PF_HASHROW_UNLOCK(sh); 625 626 return (n); 627} 628 629static int 630pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 631 struct pf_addr *src, sa_family_t af) 632{ 633 634 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 635 rule->rpool.opts & PF_POOL_STICKYADDR), 636 ("%s for non-tracking rule %p", __func__, rule)); 637 638 if (*sn == NULL) 639 *sn = pf_find_src_node(src, rule, af, 1); 640 641 if (*sn == NULL) { 642 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 643 644 PF_HASHROW_ASSERT(sh); 645 646 if (!rule->max_src_nodes || 647 counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) 648 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 649 else 650 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 651 1); 652 if ((*sn) == NULL) { 653 PF_HASHROW_UNLOCK(sh); 654 return (-1); 655 } 656 657 pf_init_threshold(&(*sn)->conn_rate, 658 rule->max_src_conn_rate.limit, 659 rule->max_src_conn_rate.seconds); 660 661 (*sn)->af = af; 662 (*sn)->rule.ptr = rule; 663 PF_ACPY(&(*sn)->addr, src, af); 664 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 665 (*sn)->creation = time_uptime; 666 (*sn)->ruletype = rule->action; 667 if ((*sn)->rule.ptr != NULL) 668 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 669 PF_HASHROW_UNLOCK(sh); 670 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 671 } else { 672 if (rule->max_src_states && 673 (*sn)->states >= rule->max_src_states) { 674 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 675 1); 676 return (-1); 677 } 678 } 679 return (0); 680} 681 682void 683pf_unlink_src_node_locked(struct pf_src_node *src) 684{ 685#ifdef INVARIANTS 686 struct pf_srchash *sh; 687 688 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 689 PF_HASHROW_ASSERT(sh); 690#endif 691 LIST_REMOVE(src, entry); 692 if (src->rule.ptr) 693 counter_u64_add(src->rule.ptr->src_nodes, -1); 694 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 695} 696 697void 698pf_unlink_src_node(struct pf_src_node *src) 699{ 700 struct pf_srchash *sh; 701 702 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 703 PF_HASHROW_LOCK(sh); 704 pf_unlink_src_node_locked(src); 705 PF_HASHROW_UNLOCK(sh); 706} 707 708static void 709pf_free_src_node(struct pf_src_node *sn) 710{ 711 712 KASSERT(sn->states == 0, ("%s: %p has refs", __func__, sn)); 713 uma_zfree(V_pf_sources_z, sn); 714} 715 716u_int 717pf_free_src_nodes(struct pf_src_node_list *head) 718{ 719 struct pf_src_node *sn, *tmp; 720 u_int count = 0; 721 722 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 723 pf_free_src_node(sn); 724 count++; 725 } 726 727 return (count); 728} 729 730void 731pf_mtag_initialize() 732{ 733 734 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 735 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 736 UMA_ALIGN_PTR, 0); 737} 738 739/* Per-vnet data storage structures initialization. */ 740void 741pf_initialize() 742{ 743 struct pf_keyhash *kh; 744 struct pf_idhash *ih; 745 struct pf_srchash *sh; 746 u_int i; 747 748 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &V_pf_hashsize); 749 if (V_pf_hashsize == 0 || !powerof2(V_pf_hashsize)) 750 V_pf_hashsize = PF_HASHSIZ; 751 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &V_pf_srchashsize); 752 if (V_pf_srchashsize == 0 || !powerof2(V_pf_srchashsize)) 753 V_pf_srchashsize = PF_HASHSIZ / 4; 754 755 V_pf_hashseed = arc4random(); 756 757 /* States and state keys storage. */ 758 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 759 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 760 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 761 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 762 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 763 764 V_pf_state_key_z = uma_zcreate("pf state keys", 765 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 766 UMA_ALIGN_PTR, 0); 767 V_pf_keyhash = malloc(V_pf_hashsize * sizeof(struct pf_keyhash), 768 M_PFHASH, M_WAITOK | M_ZERO); 769 V_pf_idhash = malloc(V_pf_hashsize * sizeof(struct pf_idhash), 770 M_PFHASH, M_WAITOK | M_ZERO); 771 V_pf_hashmask = V_pf_hashsize - 1; 772 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 773 i++, kh++, ih++) { 774 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 775 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 776 } 777 778 /* Source nodes. */ 779 V_pf_sources_z = uma_zcreate("pf source nodes", 780 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 781 0); 782 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 783 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 784 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 785 V_pf_srchash = malloc(V_pf_srchashsize * sizeof(struct pf_srchash), 786 M_PFHASH, M_WAITOK|M_ZERO); 787 V_pf_srchashmask = V_pf_srchashsize - 1; 788 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) 789 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 790 791 /* ALTQ */ 792 TAILQ_INIT(&V_pf_altqs[0]); 793 TAILQ_INIT(&V_pf_altqs[1]); 794 TAILQ_INIT(&V_pf_pabuf); 795 V_pf_altqs_active = &V_pf_altqs[0]; 796 V_pf_altqs_inactive = &V_pf_altqs[1]; 797 798 799 /* Send & overload+flush queues. */ 800 STAILQ_INIT(&V_pf_sendqueue); 801 SLIST_INIT(&V_pf_overloadqueue); 802 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 803 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 804 mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL, 805 MTX_DEF); 806 807 /* Unlinked, but may be referenced rules. */ 808 TAILQ_INIT(&V_pf_unlinked_rules); 809 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 810} 811 812void 813pf_mtag_cleanup() 814{ 815 816 uma_zdestroy(pf_mtag_z); 817} 818 819void 820pf_cleanup() 821{ 822 struct pf_keyhash *kh; 823 struct pf_idhash *ih; 824 struct pf_srchash *sh; 825 struct pf_send_entry *pfse, *next; 826 u_int i; 827 828 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask; 829 i++, kh++, ih++) { 830 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 831 __func__)); 832 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 833 __func__)); 834 mtx_destroy(&kh->lock); 835 mtx_destroy(&ih->lock); 836 } 837 free(V_pf_keyhash, M_PFHASH); 838 free(V_pf_idhash, M_PFHASH); 839 840 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 841 KASSERT(LIST_EMPTY(&sh->nodes), 842 ("%s: source node hash not empty", __func__)); 843 mtx_destroy(&sh->lock); 844 } 845 free(V_pf_srchash, M_PFHASH); 846 847 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 848 m_freem(pfse->pfse_m); 849 free(pfse, M_PFTEMP); 850 } 851 852 mtx_destroy(&pf_sendqueue_mtx); 853 mtx_destroy(&pf_overloadqueue_mtx); 854 mtx_destroy(&pf_unlnkdrules_mtx); 855 856 uma_zdestroy(V_pf_sources_z); 857 uma_zdestroy(V_pf_state_z); 858 uma_zdestroy(V_pf_state_key_z); 859} 860 861static int 862pf_mtag_uminit(void *mem, int size, int how) 863{ 864 struct m_tag *t; 865 866 t = (struct m_tag *)mem; 867 t->m_tag_cookie = MTAG_ABI_COMPAT; 868 t->m_tag_id = PACKET_TAG_PF; 869 t->m_tag_len = sizeof(struct pf_mtag); 870 t->m_tag_free = pf_mtag_free; 871 872 return (0); 873} 874 875static void 876pf_mtag_free(struct m_tag *t) 877{ 878 879 uma_zfree(pf_mtag_z, t); 880} 881 882struct pf_mtag * 883pf_get_mtag(struct mbuf *m) 884{ 885 struct m_tag *mtag; 886 887 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 888 return ((struct pf_mtag *)(mtag + 1)); 889 890 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 891 if (mtag == NULL) 892 return (NULL); 893 bzero(mtag + 1, sizeof(struct pf_mtag)); 894 m_tag_prepend(m, mtag); 895 896 return ((struct pf_mtag *)(mtag + 1)); 897} 898 899static int 900pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 901 struct pf_state *s) 902{ 903 struct pf_keyhash *khs, *khw, *kh; 904 struct pf_state_key *sk, *cur; 905 struct pf_state *si, *olds = NULL; 906 int idx; 907 908 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 909 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 910 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 911 912 /* 913 * We need to lock hash slots of both keys. To avoid deadlock 914 * we always lock the slot with lower address first. Unlock order 915 * isn't important. 916 * 917 * We also need to lock ID hash slot before dropping key 918 * locks. On success we return with ID hash slot locked. 919 */ 920 921 if (skw == sks) { 922 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 923 PF_HASHROW_LOCK(khs); 924 } else { 925 khs = &V_pf_keyhash[pf_hashkey(sks)]; 926 khw = &V_pf_keyhash[pf_hashkey(skw)]; 927 if (khs == khw) { 928 PF_HASHROW_LOCK(khs); 929 } else if (khs < khw) { 930 PF_HASHROW_LOCK(khs); 931 PF_HASHROW_LOCK(khw); 932 } else { 933 PF_HASHROW_LOCK(khw); 934 PF_HASHROW_LOCK(khs); 935 } 936 } 937 938#define KEYS_UNLOCK() do { \ 939 if (khs != khw) { \ 940 PF_HASHROW_UNLOCK(khs); \ 941 PF_HASHROW_UNLOCK(khw); \ 942 } else \ 943 PF_HASHROW_UNLOCK(khs); \ 944} while (0) 945 946 /* 947 * First run: start with wire key. 948 */ 949 sk = skw; 950 kh = khw; 951 idx = PF_SK_WIRE; 952 953keyattach: 954 LIST_FOREACH(cur, &kh->keys, entry) 955 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 956 break; 957 958 if (cur != NULL) { 959 /* Key exists. Check for same kif, if none, add to key. */ 960 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 961 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 962 963 PF_HASHROW_LOCK(ih); 964 if (si->kif == s->kif && 965 si->direction == s->direction) { 966 if (sk->proto == IPPROTO_TCP && 967 si->src.state >= TCPS_FIN_WAIT_2 && 968 si->dst.state >= TCPS_FIN_WAIT_2) { 969 /* 970 * New state matches an old >FIN_WAIT_2 971 * state. We can't drop key hash locks, 972 * thus we can't unlink it properly. 973 * 974 * As a workaround we drop it into 975 * TCPS_CLOSED state, schedule purge 976 * ASAP and push it into the very end 977 * of the slot TAILQ, so that it won't 978 * conflict with our new state. 979 */ 980 si->src.state = si->dst.state = 981 TCPS_CLOSED; 982 si->timeout = PFTM_PURGE; 983 olds = si; 984 } else { 985 if (V_pf_status.debug >= PF_DEBUG_MISC) { 986 printf("pf: %s key attach " 987 "failed on %s: ", 988 (idx == PF_SK_WIRE) ? 989 "wire" : "stack", 990 s->kif->pfik_name); 991 pf_print_state_parts(s, 992 (idx == PF_SK_WIRE) ? 993 sk : NULL, 994 (idx == PF_SK_STACK) ? 995 sk : NULL); 996 printf(", existing: "); 997 pf_print_state_parts(si, 998 (idx == PF_SK_WIRE) ? 999 sk : NULL, 1000 (idx == PF_SK_STACK) ? 1001 sk : NULL); 1002 printf("\n"); 1003 } 1004 PF_HASHROW_UNLOCK(ih); 1005 KEYS_UNLOCK(); 1006 uma_zfree(V_pf_state_key_z, sk); 1007 if (idx == PF_SK_STACK) 1008 pf_detach_state(s); 1009 return (EEXIST); /* collision! */ 1010 } 1011 } 1012 PF_HASHROW_UNLOCK(ih); 1013 } 1014 uma_zfree(V_pf_state_key_z, sk); 1015 s->key[idx] = cur; 1016 } else { 1017 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1018 s->key[idx] = sk; 1019 } 1020 1021stateattach: 1022 /* List is sorted, if-bound states before floating. */ 1023 if (s->kif == V_pfi_all) 1024 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1025 else 1026 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1027 1028 if (olds) { 1029 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1030 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1031 key_list[idx]); 1032 olds = NULL; 1033 } 1034 1035 /* 1036 * Attach done. See how should we (or should not?) 1037 * attach a second key. 1038 */ 1039 if (sks == skw) { 1040 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1041 idx = PF_SK_STACK; 1042 sks = NULL; 1043 goto stateattach; 1044 } else if (sks != NULL) { 1045 /* 1046 * Continue attaching with stack key. 1047 */ 1048 sk = sks; 1049 kh = khs; 1050 idx = PF_SK_STACK; 1051 sks = NULL; 1052 goto keyattach; 1053 } 1054 1055 PF_STATE_LOCK(s); 1056 KEYS_UNLOCK(); 1057 1058 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1059 ("%s failure", __func__)); 1060 1061 return (0); 1062#undef KEYS_UNLOCK 1063} 1064 1065static void 1066pf_detach_state(struct pf_state *s) 1067{ 1068 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1069 struct pf_keyhash *kh; 1070 1071 if (sks != NULL) { 1072 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1073 PF_HASHROW_LOCK(kh); 1074 if (s->key[PF_SK_STACK] != NULL) 1075 pf_state_key_detach(s, PF_SK_STACK); 1076 /* 1077 * If both point to same key, then we are done. 1078 */ 1079 if (sks == s->key[PF_SK_WIRE]) { 1080 pf_state_key_detach(s, PF_SK_WIRE); 1081 PF_HASHROW_UNLOCK(kh); 1082 return; 1083 } 1084 PF_HASHROW_UNLOCK(kh); 1085 } 1086 1087 if (s->key[PF_SK_WIRE] != NULL) { 1088 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1089 PF_HASHROW_LOCK(kh); 1090 if (s->key[PF_SK_WIRE] != NULL) 1091 pf_state_key_detach(s, PF_SK_WIRE); 1092 PF_HASHROW_UNLOCK(kh); 1093 } 1094} 1095 1096static void 1097pf_state_key_detach(struct pf_state *s, int idx) 1098{ 1099 struct pf_state_key *sk = s->key[idx]; 1100#ifdef INVARIANTS 1101 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1102 1103 PF_HASHROW_ASSERT(kh); 1104#endif 1105 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1106 s->key[idx] = NULL; 1107 1108 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1109 LIST_REMOVE(sk, entry); 1110 uma_zfree(V_pf_state_key_z, sk); 1111 } 1112} 1113 1114static int 1115pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1116{ 1117 struct pf_state_key *sk = mem; 1118 1119 bzero(sk, sizeof(struct pf_state_key_cmp)); 1120 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1121 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1122 1123 return (0); 1124} 1125 1126struct pf_state_key * 1127pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1128 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1129{ 1130 struct pf_state_key *sk; 1131 1132 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1133 if (sk == NULL) 1134 return (NULL); 1135 1136 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1137 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1138 sk->port[pd->sidx] = sport; 1139 sk->port[pd->didx] = dport; 1140 sk->proto = pd->proto; 1141 sk->af = pd->af; 1142 1143 return (sk); 1144} 1145 1146struct pf_state_key * 1147pf_state_key_clone(struct pf_state_key *orig) 1148{ 1149 struct pf_state_key *sk; 1150 1151 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1152 if (sk == NULL) 1153 return (NULL); 1154 1155 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1156 1157 return (sk); 1158} 1159 1160int 1161pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1162 struct pf_state_key *sks, struct pf_state *s) 1163{ 1164 struct pf_idhash *ih; 1165 struct pf_state *cur; 1166 int error; 1167 1168 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1169 ("%s: sks not pristine", __func__)); 1170 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1171 ("%s: skw not pristine", __func__)); 1172 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1173 1174 s->kif = kif; 1175 1176 if (s->id == 0 && s->creatorid == 0) { 1177 /* XXX: should be atomic, but probability of collision low */ 1178 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1179 V_pf_stateid[curcpu] = 1; 1180 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1181 s->id = htobe64(s->id); 1182 s->creatorid = V_pf_status.hostid; 1183 } 1184 1185 /* Returns with ID locked on success. */ 1186 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1187 return (error); 1188 1189 ih = &V_pf_idhash[PF_IDHASH(s)]; 1190 PF_HASHROW_ASSERT(ih); 1191 LIST_FOREACH(cur, &ih->states, entry) 1192 if (cur->id == s->id && cur->creatorid == s->creatorid) 1193 break; 1194 1195 if (cur != NULL) { 1196 PF_HASHROW_UNLOCK(ih); 1197 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1198 printf("pf: state ID collision: " 1199 "id: %016llx creatorid: %08x\n", 1200 (unsigned long long)be64toh(s->id), 1201 ntohl(s->creatorid)); 1202 } 1203 pf_detach_state(s); 1204 return (EEXIST); 1205 } 1206 LIST_INSERT_HEAD(&ih->states, s, entry); 1207 /* One for keys, one for ID hash. */ 1208 refcount_init(&s->refs, 2); 1209 1210 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1211 if (pfsync_insert_state_ptr != NULL) 1212 pfsync_insert_state_ptr(s); 1213 1214 /* Returns locked. */ 1215 return (0); 1216} 1217 1218/* 1219 * Find state by ID: returns with locked row on success. 1220 */ 1221struct pf_state * 1222pf_find_state_byid(uint64_t id, uint32_t creatorid) 1223{ 1224 struct pf_idhash *ih; 1225 struct pf_state *s; 1226 1227 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1228 1229 ih = &V_pf_idhash[(be64toh(id) % (V_pf_hashmask + 1))]; 1230 1231 PF_HASHROW_LOCK(ih); 1232 LIST_FOREACH(s, &ih->states, entry) 1233 if (s->id == id && s->creatorid == creatorid) 1234 break; 1235 1236 if (s == NULL) 1237 PF_HASHROW_UNLOCK(ih); 1238 1239 return (s); 1240} 1241 1242/* 1243 * Find state by key. 1244 * Returns with ID hash slot locked on success. 1245 */ 1246static struct pf_state * 1247pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1248{ 1249 struct pf_keyhash *kh; 1250 struct pf_state_key *sk; 1251 struct pf_state *s; 1252 int idx; 1253 1254 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1255 1256 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1257 1258 PF_HASHROW_LOCK(kh); 1259 LIST_FOREACH(sk, &kh->keys, entry) 1260 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1261 break; 1262 if (sk == NULL) { 1263 PF_HASHROW_UNLOCK(kh); 1264 return (NULL); 1265 } 1266 1267 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1268 1269 /* List is sorted, if-bound states before floating ones. */ 1270 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1271 if (s->kif == V_pfi_all || s->kif == kif) { 1272 PF_STATE_LOCK(s); 1273 PF_HASHROW_UNLOCK(kh); 1274 if (s->timeout >= PFTM_MAX) { 1275 /* 1276 * State is either being processed by 1277 * pf_unlink_state() in an other thread, or 1278 * is scheduled for immediate expiry. 1279 */ 1280 PF_STATE_UNLOCK(s); 1281 return (NULL); 1282 } 1283 return (s); 1284 } 1285 PF_HASHROW_UNLOCK(kh); 1286 1287 return (NULL); 1288} 1289 1290struct pf_state * 1291pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1292{ 1293 struct pf_keyhash *kh; 1294 struct pf_state_key *sk; 1295 struct pf_state *s, *ret = NULL; 1296 int idx, inout = 0; 1297 1298 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1299 1300 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1301 1302 PF_HASHROW_LOCK(kh); 1303 LIST_FOREACH(sk, &kh->keys, entry) 1304 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1305 break; 1306 if (sk == NULL) { 1307 PF_HASHROW_UNLOCK(kh); 1308 return (NULL); 1309 } 1310 switch (dir) { 1311 case PF_IN: 1312 idx = PF_SK_WIRE; 1313 break; 1314 case PF_OUT: 1315 idx = PF_SK_STACK; 1316 break; 1317 case PF_INOUT: 1318 idx = PF_SK_WIRE; 1319 inout = 1; 1320 break; 1321 default: 1322 panic("%s: dir %u", __func__, dir); 1323 } 1324second_run: 1325 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1326 if (more == NULL) { 1327 PF_HASHROW_UNLOCK(kh); 1328 return (s); 1329 } 1330 1331 if (ret) 1332 (*more)++; 1333 else 1334 ret = s; 1335 } 1336 if (inout == 1) { 1337 inout = 0; 1338 idx = PF_SK_STACK; 1339 goto second_run; 1340 } 1341 PF_HASHROW_UNLOCK(kh); 1342 1343 return (ret); 1344} 1345 1346/* END state table stuff */ 1347 1348static void 1349pf_send(struct pf_send_entry *pfse) 1350{ 1351 1352 PF_SENDQ_LOCK(); 1353 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1354 PF_SENDQ_UNLOCK(); 1355 swi_sched(V_pf_swi_cookie, 0); 1356} 1357 1358void 1359pf_intr(void *v) 1360{ 1361 struct pf_send_head queue; 1362 struct pf_send_entry *pfse, *next; 1363 1364 CURVNET_SET((struct vnet *)v); 1365 1366 PF_SENDQ_LOCK(); 1367 queue = V_pf_sendqueue; 1368 STAILQ_INIT(&V_pf_sendqueue); 1369 PF_SENDQ_UNLOCK(); 1370 1371 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1372 switch (pfse->pfse_type) { 1373#ifdef INET 1374 case PFSE_IP: 1375 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1376 break; 1377 case PFSE_ICMP: 1378 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1379 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1380 break; 1381#endif /* INET */ 1382#ifdef INET6 1383 case PFSE_IP6: 1384 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1385 NULL); 1386 break; 1387 case PFSE_ICMP6: 1388 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1389 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1390 break; 1391#endif /* INET6 */ 1392 default: 1393 panic("%s: unknown type", __func__); 1394 } 1395 free(pfse, M_PFTEMP); 1396 } 1397 CURVNET_RESTORE(); 1398} 1399 1400void 1401pf_purge_thread(void *v) 1402{ 1403 u_int idx = 0; 1404 1405 CURVNET_SET((struct vnet *)v); 1406 1407 for (;;) { 1408 PF_RULES_RLOCK(); 1409 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1410 1411 if (V_pf_end_threads) { 1412 /* 1413 * To cleanse up all kifs and rules we need 1414 * two runs: first one clears reference flags, 1415 * then pf_purge_expired_states() doesn't 1416 * raise them, and then second run frees. 1417 */ 1418 PF_RULES_RUNLOCK(); 1419 pf_purge_unlinked_rules(); 1420 pfi_kif_purge(); 1421 1422 /* 1423 * Now purge everything. 1424 */ 1425 pf_purge_expired_states(0, V_pf_hashmask); 1426 pf_purge_expired_fragments(); 1427 pf_purge_expired_src_nodes(); 1428 1429 /* 1430 * Now all kifs & rules should be unreferenced, 1431 * thus should be successfully freed. 1432 */ 1433 pf_purge_unlinked_rules(); 1434 pfi_kif_purge(); 1435 1436 /* 1437 * Announce success and exit. 1438 */ 1439 PF_RULES_RLOCK(); 1440 V_pf_end_threads++; 1441 PF_RULES_RUNLOCK(); 1442 wakeup(pf_purge_thread); 1443 kproc_exit(0); 1444 } 1445 PF_RULES_RUNLOCK(); 1446 1447 /* Process 1/interval fraction of the state table every run. */ 1448 idx = pf_purge_expired_states(idx, V_pf_hashmask / 1449 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1450 1451 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1452 if (idx == 0) { 1453 /* 1454 * Order is important: 1455 * - states and src nodes reference rules 1456 * - states and rules reference kifs 1457 */ 1458 pf_purge_expired_fragments(); 1459 pf_purge_expired_src_nodes(); 1460 pf_purge_unlinked_rules(); 1461 pfi_kif_purge(); 1462 } 1463 } 1464 /* not reached */ 1465 CURVNET_RESTORE(); 1466} 1467 1468u_int32_t 1469pf_state_expires(const struct pf_state *state) 1470{ 1471 u_int32_t timeout; 1472 u_int32_t start; 1473 u_int32_t end; 1474 u_int32_t states; 1475 1476 /* handle all PFTM_* > PFTM_MAX here */ 1477 if (state->timeout == PFTM_PURGE) 1478 return (time_uptime); 1479 KASSERT(state->timeout != PFTM_UNLINKED, 1480 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1481 KASSERT((state->timeout < PFTM_MAX), 1482 ("pf_state_expires: timeout > PFTM_MAX")); 1483 timeout = state->rule.ptr->timeout[state->timeout]; 1484 if (!timeout) 1485 timeout = V_pf_default_rule.timeout[state->timeout]; 1486 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1487 if (start) { 1488 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1489 states = counter_u64_fetch(state->rule.ptr->states_cur); 1490 } else { 1491 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1492 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1493 states = V_pf_status.states; 1494 } 1495 if (end && states > start && start < end) { 1496 if (states < end) 1497 return (state->expire + timeout * (end - states) / 1498 (end - start)); 1499 else 1500 return (time_uptime); 1501 } 1502 return (state->expire + timeout); 1503} 1504 1505void 1506pf_purge_expired_src_nodes() 1507{ 1508 struct pf_src_node_list freelist; 1509 struct pf_srchash *sh; 1510 struct pf_src_node *cur, *next; 1511 int i; 1512 1513 LIST_INIT(&freelist); 1514 for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) { 1515 PF_HASHROW_LOCK(sh); 1516 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1517 if (cur->states == 0 && cur->expire <= time_uptime) { 1518 pf_unlink_src_node_locked(cur); 1519 LIST_INSERT_HEAD(&freelist, cur, entry); 1520 } else if (cur->rule.ptr != NULL) 1521 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1522 PF_HASHROW_UNLOCK(sh); 1523 } 1524 1525 pf_free_src_nodes(&freelist); 1526 1527 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 1528} 1529 1530static void 1531pf_src_tree_remove_state(struct pf_state *s) 1532{ 1533 u_int32_t timeout; 1534 1535 if (s->src_node != NULL) { 1536 if (s->src.tcp_est) 1537 --s->src_node->conn; 1538 if (--s->src_node->states == 0) { 1539 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1540 if (!timeout) 1541 timeout = 1542 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1543 s->src_node->expire = time_uptime + timeout; 1544 } 1545 } 1546 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1547 if (--s->nat_src_node->states == 0) { 1548 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1549 if (!timeout) 1550 timeout = 1551 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1552 s->nat_src_node->expire = time_uptime + timeout; 1553 } 1554 } 1555 s->src_node = s->nat_src_node = NULL; 1556} 1557 1558/* 1559 * Unlink and potentilly free a state. Function may be 1560 * called with ID hash row locked, but always returns 1561 * unlocked, since it needs to go through key hash locking. 1562 */ 1563int 1564pf_unlink_state(struct pf_state *s, u_int flags) 1565{ 1566 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1567 1568 if ((flags & PF_ENTER_LOCKED) == 0) 1569 PF_HASHROW_LOCK(ih); 1570 else 1571 PF_HASHROW_ASSERT(ih); 1572 1573 if (s->timeout == PFTM_UNLINKED) { 1574 /* 1575 * State is being processed 1576 * by pf_unlink_state() in 1577 * an other thread. 1578 */ 1579 PF_HASHROW_UNLOCK(ih); 1580 return (0); /* XXXGL: undefined actually */ 1581 } 1582 1583 if (s->src.state == PF_TCPS_PROXY_DST) { 1584 /* XXX wire key the right one? */ 1585 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1586 &s->key[PF_SK_WIRE]->addr[1], 1587 &s->key[PF_SK_WIRE]->addr[0], 1588 s->key[PF_SK_WIRE]->port[1], 1589 s->key[PF_SK_WIRE]->port[0], 1590 s->src.seqhi, s->src.seqlo + 1, 1591 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1592 } 1593 1594 LIST_REMOVE(s, entry); 1595 pf_src_tree_remove_state(s); 1596 1597 if (pfsync_delete_state_ptr != NULL) 1598 pfsync_delete_state_ptr(s); 1599 1600 STATE_DEC_COUNTERS(s); 1601 1602 s->timeout = PFTM_UNLINKED; 1603 1604 PF_HASHROW_UNLOCK(ih); 1605 1606 pf_detach_state(s); 1607 refcount_release(&s->refs); 1608 1609 return (pf_release_state(s)); 1610} 1611 1612void 1613pf_free_state(struct pf_state *cur) 1614{ 1615 1616 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1617 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1618 cur->timeout)); 1619 1620 pf_normalize_tcp_cleanup(cur); 1621 uma_zfree(V_pf_state_z, cur); 1622 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 1623} 1624 1625/* 1626 * Called only from pf_purge_thread(), thus serialized. 1627 */ 1628static u_int 1629pf_purge_expired_states(u_int i, int maxcheck) 1630{ 1631 struct pf_idhash *ih; 1632 struct pf_state *s; 1633 1634 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1635 1636 /* 1637 * Go through hash and unlink states that expire now. 1638 */ 1639 while (maxcheck > 0) { 1640 1641 ih = &V_pf_idhash[i]; 1642relock: 1643 PF_HASHROW_LOCK(ih); 1644 LIST_FOREACH(s, &ih->states, entry) { 1645 if (pf_state_expires(s) <= time_uptime) { 1646 V_pf_status.states -= 1647 pf_unlink_state(s, PF_ENTER_LOCKED); 1648 goto relock; 1649 } 1650 s->rule.ptr->rule_flag |= PFRULE_REFS; 1651 if (s->nat_rule.ptr != NULL) 1652 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1653 if (s->anchor.ptr != NULL) 1654 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1655 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1656 if (s->rt_kif) 1657 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1658 } 1659 PF_HASHROW_UNLOCK(ih); 1660 1661 /* Return when we hit end of hash. */ 1662 if (++i > V_pf_hashmask) { 1663 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1664 return (0); 1665 } 1666 1667 maxcheck--; 1668 } 1669 1670 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1671 1672 return (i); 1673} 1674 1675static void 1676pf_purge_unlinked_rules() 1677{ 1678 struct pf_rulequeue tmpq; 1679 struct pf_rule *r, *r1; 1680 1681 /* 1682 * If we have overloading task pending, then we'd 1683 * better skip purging this time. There is a tiny 1684 * probability that overloading task references 1685 * an already unlinked rule. 1686 */ 1687 PF_OVERLOADQ_LOCK(); 1688 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 1689 PF_OVERLOADQ_UNLOCK(); 1690 return; 1691 } 1692 PF_OVERLOADQ_UNLOCK(); 1693 1694 /* 1695 * Do naive mark-and-sweep garbage collecting of old rules. 1696 * Reference flag is raised by pf_purge_expired_states() 1697 * and pf_purge_expired_src_nodes(). 1698 * 1699 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1700 * use a temporary queue. 1701 */ 1702 TAILQ_INIT(&tmpq); 1703 PF_UNLNKDRULES_LOCK(); 1704 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1705 if (!(r->rule_flag & PFRULE_REFS)) { 1706 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1707 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1708 } else 1709 r->rule_flag &= ~PFRULE_REFS; 1710 } 1711 PF_UNLNKDRULES_UNLOCK(); 1712 1713 if (!TAILQ_EMPTY(&tmpq)) { 1714 PF_RULES_WLOCK(); 1715 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1716 TAILQ_REMOVE(&tmpq, r, entries); 1717 pf_free_rule(r); 1718 } 1719 PF_RULES_WUNLOCK(); 1720 } 1721} 1722 1723void 1724pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1725{ 1726 switch (af) { 1727#ifdef INET 1728 case AF_INET: { 1729 u_int32_t a = ntohl(addr->addr32[0]); 1730 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1731 (a>>8)&255, a&255); 1732 if (p) { 1733 p = ntohs(p); 1734 printf(":%u", p); 1735 } 1736 break; 1737 } 1738#endif /* INET */ 1739#ifdef INET6 1740 case AF_INET6: { 1741 u_int16_t b; 1742 u_int8_t i, curstart, curend, maxstart, maxend; 1743 curstart = curend = maxstart = maxend = 255; 1744 for (i = 0; i < 8; i++) { 1745 if (!addr->addr16[i]) { 1746 if (curstart == 255) 1747 curstart = i; 1748 curend = i; 1749 } else { 1750 if ((curend - curstart) > 1751 (maxend - maxstart)) { 1752 maxstart = curstart; 1753 maxend = curend; 1754 } 1755 curstart = curend = 255; 1756 } 1757 } 1758 if ((curend - curstart) > 1759 (maxend - maxstart)) { 1760 maxstart = curstart; 1761 maxend = curend; 1762 } 1763 for (i = 0; i < 8; i++) { 1764 if (i >= maxstart && i <= maxend) { 1765 if (i == 0) 1766 printf(":"); 1767 if (i == maxend) 1768 printf(":"); 1769 } else { 1770 b = ntohs(addr->addr16[i]); 1771 printf("%x", b); 1772 if (i < 7) 1773 printf(":"); 1774 } 1775 } 1776 if (p) { 1777 p = ntohs(p); 1778 printf("[%u]", p); 1779 } 1780 break; 1781 } 1782#endif /* INET6 */ 1783 } 1784} 1785 1786void 1787pf_print_state(struct pf_state *s) 1788{ 1789 pf_print_state_parts(s, NULL, NULL); 1790} 1791 1792static void 1793pf_print_state_parts(struct pf_state *s, 1794 struct pf_state_key *skwp, struct pf_state_key *sksp) 1795{ 1796 struct pf_state_key *skw, *sks; 1797 u_int8_t proto, dir; 1798 1799 /* Do our best to fill these, but they're skipped if NULL */ 1800 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1801 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1802 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1803 dir = s ? s->direction : 0; 1804 1805 switch (proto) { 1806 case IPPROTO_IPV4: 1807 printf("IPv4"); 1808 break; 1809 case IPPROTO_IPV6: 1810 printf("IPv6"); 1811 break; 1812 case IPPROTO_TCP: 1813 printf("TCP"); 1814 break; 1815 case IPPROTO_UDP: 1816 printf("UDP"); 1817 break; 1818 case IPPROTO_ICMP: 1819 printf("ICMP"); 1820 break; 1821 case IPPROTO_ICMPV6: 1822 printf("ICMPv6"); 1823 break; 1824 default: 1825 printf("%u", skw->proto); 1826 break; 1827 } 1828 switch (dir) { 1829 case PF_IN: 1830 printf(" in"); 1831 break; 1832 case PF_OUT: 1833 printf(" out"); 1834 break; 1835 } 1836 if (skw) { 1837 printf(" wire: "); 1838 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1839 printf(" "); 1840 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1841 } 1842 if (sks) { 1843 printf(" stack: "); 1844 if (sks != skw) { 1845 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1846 printf(" "); 1847 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1848 } else 1849 printf("-"); 1850 } 1851 if (s) { 1852 if (proto == IPPROTO_TCP) { 1853 printf(" [lo=%u high=%u win=%u modulator=%u", 1854 s->src.seqlo, s->src.seqhi, 1855 s->src.max_win, s->src.seqdiff); 1856 if (s->src.wscale && s->dst.wscale) 1857 printf(" wscale=%u", 1858 s->src.wscale & PF_WSCALE_MASK); 1859 printf("]"); 1860 printf(" [lo=%u high=%u win=%u modulator=%u", 1861 s->dst.seqlo, s->dst.seqhi, 1862 s->dst.max_win, s->dst.seqdiff); 1863 if (s->src.wscale && s->dst.wscale) 1864 printf(" wscale=%u", 1865 s->dst.wscale & PF_WSCALE_MASK); 1866 printf("]"); 1867 } 1868 printf(" %u:%u", s->src.state, s->dst.state); 1869 } 1870} 1871 1872void 1873pf_print_flags(u_int8_t f) 1874{ 1875 if (f) 1876 printf(" "); 1877 if (f & TH_FIN) 1878 printf("F"); 1879 if (f & TH_SYN) 1880 printf("S"); 1881 if (f & TH_RST) 1882 printf("R"); 1883 if (f & TH_PUSH) 1884 printf("P"); 1885 if (f & TH_ACK) 1886 printf("A"); 1887 if (f & TH_URG) 1888 printf("U"); 1889 if (f & TH_ECE) 1890 printf("E"); 1891 if (f & TH_CWR) 1892 printf("W"); 1893} 1894 1895#define PF_SET_SKIP_STEPS(i) \ 1896 do { \ 1897 while (head[i] != cur) { \ 1898 head[i]->skip[i].ptr = cur; \ 1899 head[i] = TAILQ_NEXT(head[i], entries); \ 1900 } \ 1901 } while (0) 1902 1903void 1904pf_calc_skip_steps(struct pf_rulequeue *rules) 1905{ 1906 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1907 int i; 1908 1909 cur = TAILQ_FIRST(rules); 1910 prev = cur; 1911 for (i = 0; i < PF_SKIP_COUNT; ++i) 1912 head[i] = cur; 1913 while (cur != NULL) { 1914 1915 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1916 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1917 if (cur->direction != prev->direction) 1918 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1919 if (cur->af != prev->af) 1920 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1921 if (cur->proto != prev->proto) 1922 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1923 if (cur->src.neg != prev->src.neg || 1924 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1925 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1926 if (cur->src.port[0] != prev->src.port[0] || 1927 cur->src.port[1] != prev->src.port[1] || 1928 cur->src.port_op != prev->src.port_op) 1929 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1930 if (cur->dst.neg != prev->dst.neg || 1931 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1932 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1933 if (cur->dst.port[0] != prev->dst.port[0] || 1934 cur->dst.port[1] != prev->dst.port[1] || 1935 cur->dst.port_op != prev->dst.port_op) 1936 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1937 1938 prev = cur; 1939 cur = TAILQ_NEXT(cur, entries); 1940 } 1941 for (i = 0; i < PF_SKIP_COUNT; ++i) 1942 PF_SET_SKIP_STEPS(i); 1943} 1944 1945static int 1946pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1947{ 1948 if (aw1->type != aw2->type) 1949 return (1); 1950 switch (aw1->type) { 1951 case PF_ADDR_ADDRMASK: 1952 case PF_ADDR_RANGE: 1953 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1954 return (1); 1955 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1956 return (1); 1957 return (0); 1958 case PF_ADDR_DYNIFTL: 1959 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1960 case PF_ADDR_NOROUTE: 1961 case PF_ADDR_URPFFAILED: 1962 return (0); 1963 case PF_ADDR_TABLE: 1964 return (aw1->p.tbl != aw2->p.tbl); 1965 default: 1966 printf("invalid address type: %d\n", aw1->type); 1967 return (1); 1968 } 1969} 1970 1971u_int16_t 1972pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1973{ 1974 u_int32_t l; 1975 1976 if (udp && !cksum) 1977 return (0x0000); 1978 l = cksum + old - new; 1979 l = (l >> 16) + (l & 65535); 1980 l = l & 65535; 1981 if (udp && !l) 1982 return (0xFFFF); 1983 return (l); 1984} 1985 1986static void 1987pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1988 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1989{ 1990 struct pf_addr ao; 1991 u_int16_t po = *p; 1992 1993 PF_ACPY(&ao, a, af); 1994 PF_ACPY(a, an, af); 1995 1996 *p = pn; 1997 1998 switch (af) { 1999#ifdef INET 2000 case AF_INET: 2001 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2002 ao.addr16[0], an->addr16[0], 0), 2003 ao.addr16[1], an->addr16[1], 0); 2004 *p = pn; 2005 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2006 ao.addr16[0], an->addr16[0], u), 2007 ao.addr16[1], an->addr16[1], u), 2008 po, pn, u); 2009 break; 2010#endif /* INET */ 2011#ifdef INET6 2012 case AF_INET6: 2013 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2014 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2015 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2016 ao.addr16[0], an->addr16[0], u), 2017 ao.addr16[1], an->addr16[1], u), 2018 ao.addr16[2], an->addr16[2], u), 2019 ao.addr16[3], an->addr16[3], u), 2020 ao.addr16[4], an->addr16[4], u), 2021 ao.addr16[5], an->addr16[5], u), 2022 ao.addr16[6], an->addr16[6], u), 2023 ao.addr16[7], an->addr16[7], u), 2024 po, pn, u); 2025 break; 2026#endif /* INET6 */ 2027 } 2028} 2029 2030 2031/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2032void 2033pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2034{ 2035 u_int32_t ao; 2036 2037 memcpy(&ao, a, sizeof(ao)); 2038 memcpy(a, &an, sizeof(u_int32_t)); 2039 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2040 ao % 65536, an % 65536, u); 2041} 2042 2043#ifdef INET6 2044static void 2045pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2046{ 2047 struct pf_addr ao; 2048 2049 PF_ACPY(&ao, a, AF_INET6); 2050 PF_ACPY(a, an, AF_INET6); 2051 2052 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2053 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2054 pf_cksum_fixup(pf_cksum_fixup(*c, 2055 ao.addr16[0], an->addr16[0], u), 2056 ao.addr16[1], an->addr16[1], u), 2057 ao.addr16[2], an->addr16[2], u), 2058 ao.addr16[3], an->addr16[3], u), 2059 ao.addr16[4], an->addr16[4], u), 2060 ao.addr16[5], an->addr16[5], u), 2061 ao.addr16[6], an->addr16[6], u), 2062 ao.addr16[7], an->addr16[7], u); 2063} 2064#endif /* INET6 */ 2065 2066static void 2067pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2068 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2069 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2070{ 2071 struct pf_addr oia, ooa; 2072 2073 PF_ACPY(&oia, ia, af); 2074 if (oa) 2075 PF_ACPY(&ooa, oa, af); 2076 2077 /* Change inner protocol port, fix inner protocol checksum. */ 2078 if (ip != NULL) { 2079 u_int16_t oip = *ip; 2080 u_int32_t opc; 2081 2082 if (pc != NULL) 2083 opc = *pc; 2084 *ip = np; 2085 if (pc != NULL) 2086 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2087 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2088 if (pc != NULL) 2089 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2090 } 2091 /* Change inner ip address, fix inner ip and icmp checksums. */ 2092 PF_ACPY(ia, na, af); 2093 switch (af) { 2094#ifdef INET 2095 case AF_INET: { 2096 u_int32_t oh2c = *h2c; 2097 2098 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2099 oia.addr16[0], ia->addr16[0], 0), 2100 oia.addr16[1], ia->addr16[1], 0); 2101 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2102 oia.addr16[0], ia->addr16[0], 0), 2103 oia.addr16[1], ia->addr16[1], 0); 2104 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2105 break; 2106 } 2107#endif /* INET */ 2108#ifdef INET6 2109 case AF_INET6: 2110 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2111 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2112 pf_cksum_fixup(pf_cksum_fixup(*ic, 2113 oia.addr16[0], ia->addr16[0], u), 2114 oia.addr16[1], ia->addr16[1], u), 2115 oia.addr16[2], ia->addr16[2], u), 2116 oia.addr16[3], ia->addr16[3], u), 2117 oia.addr16[4], ia->addr16[4], u), 2118 oia.addr16[5], ia->addr16[5], u), 2119 oia.addr16[6], ia->addr16[6], u), 2120 oia.addr16[7], ia->addr16[7], u); 2121 break; 2122#endif /* INET6 */ 2123 } 2124 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2125 if (oa) { 2126 PF_ACPY(oa, na, af); 2127 switch (af) { 2128#ifdef INET 2129 case AF_INET: 2130 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2131 ooa.addr16[0], oa->addr16[0], 0), 2132 ooa.addr16[1], oa->addr16[1], 0); 2133 break; 2134#endif /* INET */ 2135#ifdef INET6 2136 case AF_INET6: 2137 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2138 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2139 pf_cksum_fixup(pf_cksum_fixup(*ic, 2140 ooa.addr16[0], oa->addr16[0], u), 2141 ooa.addr16[1], oa->addr16[1], u), 2142 ooa.addr16[2], oa->addr16[2], u), 2143 ooa.addr16[3], oa->addr16[3], u), 2144 ooa.addr16[4], oa->addr16[4], u), 2145 ooa.addr16[5], oa->addr16[5], u), 2146 ooa.addr16[6], oa->addr16[6], u), 2147 ooa.addr16[7], oa->addr16[7], u); 2148 break; 2149#endif /* INET6 */ 2150 } 2151 } 2152} 2153 2154 2155/* 2156 * Need to modulate the sequence numbers in the TCP SACK option 2157 * (credits to Krzysztof Pfaff for report and patch) 2158 */ 2159static int 2160pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2161 struct tcphdr *th, struct pf_state_peer *dst) 2162{ 2163 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2164 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2165 int copyback = 0, i, olen; 2166 struct sackblk sack; 2167 2168#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2169 if (hlen < TCPOLEN_SACKLEN || 2170 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2171 return 0; 2172 2173 while (hlen >= TCPOLEN_SACKLEN) { 2174 olen = opt[1]; 2175 switch (*opt) { 2176 case TCPOPT_EOL: /* FALLTHROUGH */ 2177 case TCPOPT_NOP: 2178 opt++; 2179 hlen--; 2180 break; 2181 case TCPOPT_SACK: 2182 if (olen > hlen) 2183 olen = hlen; 2184 if (olen >= TCPOLEN_SACKLEN) { 2185 for (i = 2; i + TCPOLEN_SACK <= olen; 2186 i += TCPOLEN_SACK) { 2187 memcpy(&sack, &opt[i], sizeof(sack)); 2188 pf_change_a(&sack.start, &th->th_sum, 2189 htonl(ntohl(sack.start) - 2190 dst->seqdiff), 0); 2191 pf_change_a(&sack.end, &th->th_sum, 2192 htonl(ntohl(sack.end) - 2193 dst->seqdiff), 0); 2194 memcpy(&opt[i], &sack, sizeof(sack)); 2195 } 2196 copyback = 1; 2197 } 2198 /* FALLTHROUGH */ 2199 default: 2200 if (olen < 2) 2201 olen = 2; 2202 hlen -= olen; 2203 opt += olen; 2204 } 2205 } 2206 2207 if (copyback) 2208 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2209 return (copyback); 2210} 2211 2212static void 2213pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2214 const struct pf_addr *saddr, const struct pf_addr *daddr, 2215 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2216 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2217 u_int16_t rtag, struct ifnet *ifp) 2218{ 2219 struct pf_send_entry *pfse; 2220 struct mbuf *m; 2221 int len, tlen; 2222#ifdef INET 2223 struct ip *h = NULL; 2224#endif /* INET */ 2225#ifdef INET6 2226 struct ip6_hdr *h6 = NULL; 2227#endif /* INET6 */ 2228 struct tcphdr *th; 2229 char *opt; 2230 struct pf_mtag *pf_mtag; 2231 2232 len = 0; 2233 th = NULL; 2234 2235 /* maximum segment size tcp option */ 2236 tlen = sizeof(struct tcphdr); 2237 if (mss) 2238 tlen += 4; 2239 2240 switch (af) { 2241#ifdef INET 2242 case AF_INET: 2243 len = sizeof(struct ip) + tlen; 2244 break; 2245#endif /* INET */ 2246#ifdef INET6 2247 case AF_INET6: 2248 len = sizeof(struct ip6_hdr) + tlen; 2249 break; 2250#endif /* INET6 */ 2251 default: 2252 panic("%s: unsupported af %d", __func__, af); 2253 } 2254 2255 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2256 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2257 if (pfse == NULL) 2258 return; 2259 m = m_gethdr(M_NOWAIT, MT_DATA); 2260 if (m == NULL) { 2261 free(pfse, M_PFTEMP); 2262 return; 2263 } 2264#ifdef MAC 2265 mac_netinet_firewall_send(m); 2266#endif 2267 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2268 free(pfse, M_PFTEMP); 2269 m_freem(m); 2270 return; 2271 } 2272 if (tag) 2273 m->m_flags |= M_SKIP_FIREWALL; 2274 pf_mtag->tag = rtag; 2275 2276 if (r != NULL && r->rtableid >= 0) 2277 M_SETFIB(m, r->rtableid); 2278 2279#ifdef ALTQ 2280 if (r != NULL && r->qid) { 2281 pf_mtag->qid = r->qid; 2282 2283 /* add hints for ecn */ 2284 pf_mtag->hdr = mtod(m, struct ip *); 2285 } 2286#endif /* ALTQ */ 2287 m->m_data += max_linkhdr; 2288 m->m_pkthdr.len = m->m_len = len; 2289 m->m_pkthdr.rcvif = NULL; 2290 bzero(m->m_data, len); 2291 switch (af) { 2292#ifdef INET 2293 case AF_INET: 2294 h = mtod(m, struct ip *); 2295 2296 /* IP header fields included in the TCP checksum */ 2297 h->ip_p = IPPROTO_TCP; 2298 h->ip_len = htons(tlen); 2299 h->ip_src.s_addr = saddr->v4.s_addr; 2300 h->ip_dst.s_addr = daddr->v4.s_addr; 2301 2302 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2303 break; 2304#endif /* INET */ 2305#ifdef INET6 2306 case AF_INET6: 2307 h6 = mtod(m, struct ip6_hdr *); 2308 2309 /* IP header fields included in the TCP checksum */ 2310 h6->ip6_nxt = IPPROTO_TCP; 2311 h6->ip6_plen = htons(tlen); 2312 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2313 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2314 2315 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2316 break; 2317#endif /* INET6 */ 2318 } 2319 2320 /* TCP header */ 2321 th->th_sport = sport; 2322 th->th_dport = dport; 2323 th->th_seq = htonl(seq); 2324 th->th_ack = htonl(ack); 2325 th->th_off = tlen >> 2; 2326 th->th_flags = flags; 2327 th->th_win = htons(win); 2328 2329 if (mss) { 2330 opt = (char *)(th + 1); 2331 opt[0] = TCPOPT_MAXSEG; 2332 opt[1] = 4; 2333 HTONS(mss); 2334 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2335 } 2336 2337 switch (af) { 2338#ifdef INET 2339 case AF_INET: 2340 /* TCP checksum */ 2341 th->th_sum = in_cksum(m, len); 2342 2343 /* Finish the IP header */ 2344 h->ip_v = 4; 2345 h->ip_hl = sizeof(*h) >> 2; 2346 h->ip_tos = IPTOS_LOWDELAY; 2347 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2348 h->ip_len = htons(len); 2349 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2350 h->ip_sum = 0; 2351 2352 pfse->pfse_type = PFSE_IP; 2353 break; 2354#endif /* INET */ 2355#ifdef INET6 2356 case AF_INET6: 2357 /* TCP checksum */ 2358 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2359 sizeof(struct ip6_hdr), tlen); 2360 2361 h6->ip6_vfc |= IPV6_VERSION; 2362 h6->ip6_hlim = IPV6_DEFHLIM; 2363 2364 pfse->pfse_type = PFSE_IP6; 2365 break; 2366#endif /* INET6 */ 2367 } 2368 pfse->pfse_m = m; 2369 pf_send(pfse); 2370} 2371 2372static void 2373pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2374 struct pf_rule *r) 2375{ 2376 struct pf_send_entry *pfse; 2377 struct mbuf *m0; 2378 struct pf_mtag *pf_mtag; 2379 2380 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2381 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2382 if (pfse == NULL) 2383 return; 2384 2385 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2386 free(pfse, M_PFTEMP); 2387 return; 2388 } 2389 2390 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2391 free(pfse, M_PFTEMP); 2392 return; 2393 } 2394 /* XXX: revisit */ 2395 m0->m_flags |= M_SKIP_FIREWALL; 2396 2397 if (r->rtableid >= 0) 2398 M_SETFIB(m0, r->rtableid); 2399 2400#ifdef ALTQ 2401 if (r->qid) { 2402 pf_mtag->qid = r->qid; 2403 /* add hints for ecn */ 2404 pf_mtag->hdr = mtod(m0, struct ip *); 2405 } 2406#endif /* ALTQ */ 2407 2408 switch (af) { 2409#ifdef INET 2410 case AF_INET: 2411 pfse->pfse_type = PFSE_ICMP; 2412 break; 2413#endif /* INET */ 2414#ifdef INET6 2415 case AF_INET6: 2416 pfse->pfse_type = PFSE_ICMP6; 2417 break; 2418#endif /* INET6 */ 2419 } 2420 pfse->pfse_m = m0; 2421 pfse->pfse_icmp_type = type; 2422 pfse->pfse_icmp_code = code; 2423 pf_send(pfse); 2424} 2425 2426/* 2427 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2428 * If n is 0, they match if they are equal. If n is != 0, they match if they 2429 * are different. 2430 */ 2431int 2432pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2433 struct pf_addr *b, sa_family_t af) 2434{ 2435 int match = 0; 2436 2437 switch (af) { 2438#ifdef INET 2439 case AF_INET: 2440 if ((a->addr32[0] & m->addr32[0]) == 2441 (b->addr32[0] & m->addr32[0])) 2442 match++; 2443 break; 2444#endif /* INET */ 2445#ifdef INET6 2446 case AF_INET6: 2447 if (((a->addr32[0] & m->addr32[0]) == 2448 (b->addr32[0] & m->addr32[0])) && 2449 ((a->addr32[1] & m->addr32[1]) == 2450 (b->addr32[1] & m->addr32[1])) && 2451 ((a->addr32[2] & m->addr32[2]) == 2452 (b->addr32[2] & m->addr32[2])) && 2453 ((a->addr32[3] & m->addr32[3]) == 2454 (b->addr32[3] & m->addr32[3]))) 2455 match++; 2456 break; 2457#endif /* INET6 */ 2458 } 2459 if (match) { 2460 if (n) 2461 return (0); 2462 else 2463 return (1); 2464 } else { 2465 if (n) 2466 return (1); 2467 else 2468 return (0); 2469 } 2470} 2471 2472/* 2473 * Return 1 if b <= a <= e, otherwise return 0. 2474 */ 2475int 2476pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2477 struct pf_addr *a, sa_family_t af) 2478{ 2479 switch (af) { 2480#ifdef INET 2481 case AF_INET: 2482 if ((a->addr32[0] < b->addr32[0]) || 2483 (a->addr32[0] > e->addr32[0])) 2484 return (0); 2485 break; 2486#endif /* INET */ 2487#ifdef INET6 2488 case AF_INET6: { 2489 int i; 2490 2491 /* check a >= b */ 2492 for (i = 0; i < 4; ++i) 2493 if (a->addr32[i] > b->addr32[i]) 2494 break; 2495 else if (a->addr32[i] < b->addr32[i]) 2496 return (0); 2497 /* check a <= e */ 2498 for (i = 0; i < 4; ++i) 2499 if (a->addr32[i] < e->addr32[i]) 2500 break; 2501 else if (a->addr32[i] > e->addr32[i]) 2502 return (0); 2503 break; 2504 } 2505#endif /* INET6 */ 2506 } 2507 return (1); 2508} 2509 2510static int 2511pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2512{ 2513 switch (op) { 2514 case PF_OP_IRG: 2515 return ((p > a1) && (p < a2)); 2516 case PF_OP_XRG: 2517 return ((p < a1) || (p > a2)); 2518 case PF_OP_RRG: 2519 return ((p >= a1) && (p <= a2)); 2520 case PF_OP_EQ: 2521 return (p == a1); 2522 case PF_OP_NE: 2523 return (p != a1); 2524 case PF_OP_LT: 2525 return (p < a1); 2526 case PF_OP_LE: 2527 return (p <= a1); 2528 case PF_OP_GT: 2529 return (p > a1); 2530 case PF_OP_GE: 2531 return (p >= a1); 2532 } 2533 return (0); /* never reached */ 2534} 2535 2536int 2537pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2538{ 2539 NTOHS(a1); 2540 NTOHS(a2); 2541 NTOHS(p); 2542 return (pf_match(op, a1, a2, p)); 2543} 2544 2545static int 2546pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2547{ 2548 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2549 return (0); 2550 return (pf_match(op, a1, a2, u)); 2551} 2552 2553static int 2554pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2555{ 2556 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2557 return (0); 2558 return (pf_match(op, a1, a2, g)); 2559} 2560 2561int 2562pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2563{ 2564 if (*tag == -1) 2565 *tag = mtag; 2566 2567 return ((!r->match_tag_not && r->match_tag == *tag) || 2568 (r->match_tag_not && r->match_tag != *tag)); 2569} 2570 2571int 2572pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2573{ 2574 2575 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2576 2577 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2578 return (ENOMEM); 2579 2580 pd->pf_mtag->tag = tag; 2581 2582 return (0); 2583} 2584 2585#define PF_ANCHOR_STACKSIZE 32 2586struct pf_anchor_stackframe { 2587 struct pf_ruleset *rs; 2588 struct pf_rule *r; /* XXX: + match bit */ 2589 struct pf_anchor *child; 2590}; 2591 2592/* 2593 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2594 */ 2595#define PF_ANCHORSTACK_MATCH 0x00000001 2596#define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2597 2598#define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2599#define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2600 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2601#define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2602 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2603} while (0) 2604 2605void 2606pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2607 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2608 int *match) 2609{ 2610 struct pf_anchor_stackframe *f; 2611 2612 PF_RULES_RASSERT(); 2613 2614 if (match) 2615 *match = 0; 2616 if (*depth >= PF_ANCHOR_STACKSIZE) { 2617 printf("%s: anchor stack overflow on %s\n", 2618 __func__, (*r)->anchor->name); 2619 *r = TAILQ_NEXT(*r, entries); 2620 return; 2621 } else if (*depth == 0 && a != NULL) 2622 *a = *r; 2623 f = stack + (*depth)++; 2624 f->rs = *rs; 2625 f->r = *r; 2626 if ((*r)->anchor_wildcard) { 2627 struct pf_anchor_node *parent = &(*r)->anchor->children; 2628 2629 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2630 *r = NULL; 2631 return; 2632 } 2633 *rs = &f->child->ruleset; 2634 } else { 2635 f->child = NULL; 2636 *rs = &(*r)->anchor->ruleset; 2637 } 2638 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2639} 2640 2641int 2642pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2643 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2644 int *match) 2645{ 2646 struct pf_anchor_stackframe *f; 2647 struct pf_rule *fr; 2648 int quick = 0; 2649 2650 PF_RULES_RASSERT(); 2651 2652 do { 2653 if (*depth <= 0) 2654 break; 2655 f = stack + *depth - 1; 2656 fr = PF_ANCHOR_RULE(f); 2657 if (f->child != NULL) { 2658 struct pf_anchor_node *parent; 2659 2660 /* 2661 * This block traverses through 2662 * a wildcard anchor. 2663 */ 2664 parent = &fr->anchor->children; 2665 if (match != NULL && *match) { 2666 /* 2667 * If any of "*" matched, then 2668 * "foo/ *" matched, mark frame 2669 * appropriately. 2670 */ 2671 PF_ANCHOR_SET_MATCH(f); 2672 *match = 0; 2673 } 2674 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2675 if (f->child != NULL) { 2676 *rs = &f->child->ruleset; 2677 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2678 if (*r == NULL) 2679 continue; 2680 else 2681 break; 2682 } 2683 } 2684 (*depth)--; 2685 if (*depth == 0 && a != NULL) 2686 *a = NULL; 2687 *rs = f->rs; 2688 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 2689 quick = fr->quick; 2690 *r = TAILQ_NEXT(fr, entries); 2691 } while (*r == NULL); 2692 2693 return (quick); 2694} 2695 2696#ifdef INET6 2697void 2698pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2699 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2700{ 2701 switch (af) { 2702#ifdef INET 2703 case AF_INET: 2704 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2705 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2706 break; 2707#endif /* INET */ 2708 case AF_INET6: 2709 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2710 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2711 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2712 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2713 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2714 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2715 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2716 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2717 break; 2718 } 2719} 2720 2721void 2722pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2723{ 2724 switch (af) { 2725#ifdef INET 2726 case AF_INET: 2727 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2728 break; 2729#endif /* INET */ 2730 case AF_INET6: 2731 if (addr->addr32[3] == 0xffffffff) { 2732 addr->addr32[3] = 0; 2733 if (addr->addr32[2] == 0xffffffff) { 2734 addr->addr32[2] = 0; 2735 if (addr->addr32[1] == 0xffffffff) { 2736 addr->addr32[1] = 0; 2737 addr->addr32[0] = 2738 htonl(ntohl(addr->addr32[0]) + 1); 2739 } else 2740 addr->addr32[1] = 2741 htonl(ntohl(addr->addr32[1]) + 1); 2742 } else 2743 addr->addr32[2] = 2744 htonl(ntohl(addr->addr32[2]) + 1); 2745 } else 2746 addr->addr32[3] = 2747 htonl(ntohl(addr->addr32[3]) + 1); 2748 break; 2749 } 2750} 2751#endif /* INET6 */ 2752 2753int 2754pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2755{ 2756 struct pf_addr *saddr, *daddr; 2757 u_int16_t sport, dport; 2758 struct inpcbinfo *pi; 2759 struct inpcb *inp; 2760 2761 pd->lookup.uid = UID_MAX; 2762 pd->lookup.gid = GID_MAX; 2763 2764 switch (pd->proto) { 2765 case IPPROTO_TCP: 2766 if (pd->hdr.tcp == NULL) 2767 return (-1); 2768 sport = pd->hdr.tcp->th_sport; 2769 dport = pd->hdr.tcp->th_dport; 2770 pi = &V_tcbinfo; 2771 break; 2772 case IPPROTO_UDP: 2773 if (pd->hdr.udp == NULL) 2774 return (-1); 2775 sport = pd->hdr.udp->uh_sport; 2776 dport = pd->hdr.udp->uh_dport; 2777 pi = &V_udbinfo; 2778 break; 2779 default: 2780 return (-1); 2781 } 2782 if (direction == PF_IN) { 2783 saddr = pd->src; 2784 daddr = pd->dst; 2785 } else { 2786 u_int16_t p; 2787 2788 p = sport; 2789 sport = dport; 2790 dport = p; 2791 saddr = pd->dst; 2792 daddr = pd->src; 2793 } 2794 switch (pd->af) { 2795#ifdef INET 2796 case AF_INET: 2797 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2798 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2799 if (inp == NULL) { 2800 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2801 daddr->v4, dport, INPLOOKUP_WILDCARD | 2802 INPLOOKUP_RLOCKPCB, NULL, m); 2803 if (inp == NULL) 2804 return (-1); 2805 } 2806 break; 2807#endif /* INET */ 2808#ifdef INET6 2809 case AF_INET6: 2810 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2811 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2812 if (inp == NULL) { 2813 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2814 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2815 INPLOOKUP_RLOCKPCB, NULL, m); 2816 if (inp == NULL) 2817 return (-1); 2818 } 2819 break; 2820#endif /* INET6 */ 2821 2822 default: 2823 return (-1); 2824 } 2825 INP_RLOCK_ASSERT(inp); 2826 pd->lookup.uid = inp->inp_cred->cr_uid; 2827 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2828 INP_RUNLOCK(inp); 2829 2830 return (1); 2831} 2832 2833static u_int8_t 2834pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2835{ 2836 int hlen; 2837 u_int8_t hdr[60]; 2838 u_int8_t *opt, optlen; 2839 u_int8_t wscale = 0; 2840 2841 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2842 if (hlen <= sizeof(struct tcphdr)) 2843 return (0); 2844 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2845 return (0); 2846 opt = hdr + sizeof(struct tcphdr); 2847 hlen -= sizeof(struct tcphdr); 2848 while (hlen >= 3) { 2849 switch (*opt) { 2850 case TCPOPT_EOL: 2851 case TCPOPT_NOP: 2852 ++opt; 2853 --hlen; 2854 break; 2855 case TCPOPT_WINDOW: 2856 wscale = opt[2]; 2857 if (wscale > TCP_MAX_WINSHIFT) 2858 wscale = TCP_MAX_WINSHIFT; 2859 wscale |= PF_WSCALE_FLAG; 2860 /* FALLTHROUGH */ 2861 default: 2862 optlen = opt[1]; 2863 if (optlen < 2) 2864 optlen = 2; 2865 hlen -= optlen; 2866 opt += optlen; 2867 break; 2868 } 2869 } 2870 return (wscale); 2871} 2872 2873static u_int16_t 2874pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2875{ 2876 int hlen; 2877 u_int8_t hdr[60]; 2878 u_int8_t *opt, optlen; 2879 u_int16_t mss = V_tcp_mssdflt; 2880 2881 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2882 if (hlen <= sizeof(struct tcphdr)) 2883 return (0); 2884 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2885 return (0); 2886 opt = hdr + sizeof(struct tcphdr); 2887 hlen -= sizeof(struct tcphdr); 2888 while (hlen >= TCPOLEN_MAXSEG) { 2889 switch (*opt) { 2890 case TCPOPT_EOL: 2891 case TCPOPT_NOP: 2892 ++opt; 2893 --hlen; 2894 break; 2895 case TCPOPT_MAXSEG: 2896 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2897 NTOHS(mss); 2898 /* FALLTHROUGH */ 2899 default: 2900 optlen = opt[1]; 2901 if (optlen < 2) 2902 optlen = 2; 2903 hlen -= optlen; 2904 opt += optlen; 2905 break; 2906 } 2907 } 2908 return (mss); 2909} 2910 2911static u_int16_t 2912pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 2913{ 2914#ifdef INET 2915 struct sockaddr_in *dst; 2916 struct route ro; 2917#endif /* INET */ 2918#ifdef INET6 2919 struct sockaddr_in6 *dst6; 2920 struct route_in6 ro6; 2921#endif /* INET6 */ 2922 struct rtentry *rt = NULL; 2923 int hlen = 0; 2924 u_int16_t mss = V_tcp_mssdflt; 2925 2926 switch (af) { 2927#ifdef INET 2928 case AF_INET: 2929 hlen = sizeof(struct ip); 2930 bzero(&ro, sizeof(ro)); 2931 dst = (struct sockaddr_in *)&ro.ro_dst; 2932 dst->sin_family = AF_INET; 2933 dst->sin_len = sizeof(*dst); 2934 dst->sin_addr = addr->v4; 2935 in_rtalloc_ign(&ro, 0, rtableid); 2936 rt = ro.ro_rt; 2937 break; 2938#endif /* INET */ 2939#ifdef INET6 2940 case AF_INET6: 2941 hlen = sizeof(struct ip6_hdr); 2942 bzero(&ro6, sizeof(ro6)); 2943 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2944 dst6->sin6_family = AF_INET6; 2945 dst6->sin6_len = sizeof(*dst6); 2946 dst6->sin6_addr = addr->v6; 2947 in6_rtalloc_ign(&ro6, 0, rtableid); 2948 rt = ro6.ro_rt; 2949 break; 2950#endif /* INET6 */ 2951 } 2952 2953 if (rt && rt->rt_ifp) { 2954 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2955 mss = max(V_tcp_mssdflt, mss); 2956 RTFREE(rt); 2957 } 2958 mss = min(mss, offer); 2959 mss = max(mss, 64); /* sanity - at least max opt space */ 2960 return (mss); 2961} 2962 2963static void 2964pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 2965{ 2966 struct pf_rule *r = s->rule.ptr; 2967 struct pf_src_node *sn = NULL; 2968 2969 s->rt_kif = NULL; 2970 if (!r->rt || r->rt == PF_FASTROUTE) 2971 return; 2972 switch (s->key[PF_SK_WIRE]->af) { 2973#ifdef INET 2974 case AF_INET: 2975 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, &sn); 2976 s->rt_kif = r->rpool.cur->kif; 2977 break; 2978#endif /* INET */ 2979#ifdef INET6 2980 case AF_INET6: 2981 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, &sn); 2982 s->rt_kif = r->rpool.cur->kif; 2983 break; 2984#endif /* INET6 */ 2985 } 2986} 2987 2988static u_int32_t 2989pf_tcp_iss(struct pf_pdesc *pd) 2990{ 2991 MD5_CTX ctx; 2992 u_int32_t digest[4]; 2993 2994 if (V_pf_tcp_secret_init == 0) { 2995 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 2996 MD5Init(&V_pf_tcp_secret_ctx); 2997 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 2998 sizeof(V_pf_tcp_secret)); 2999 V_pf_tcp_secret_init = 1; 3000 } 3001 3002 ctx = V_pf_tcp_secret_ctx; 3003 3004 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3005 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3006 if (pd->af == AF_INET6) { 3007 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3008 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3009 } else { 3010 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3011 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3012 } 3013 MD5Final((u_char *)digest, &ctx); 3014 V_pf_tcp_iss_off += 4096; 3015#define ISN_RANDOM_INCREMENT (4096 - 1) 3016 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 3017 V_pf_tcp_iss_off); 3018#undef ISN_RANDOM_INCREMENT 3019} 3020 3021static int 3022pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3023 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 3024 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 3025{ 3026 struct pf_rule *nr = NULL; 3027 struct pf_addr * const saddr = pd->src; 3028 struct pf_addr * const daddr = pd->dst; 3029 sa_family_t af = pd->af; 3030 struct pf_rule *r, *a = NULL; 3031 struct pf_ruleset *ruleset = NULL; 3032 struct pf_src_node *nsn = NULL; 3033 struct tcphdr *th = pd->hdr.tcp; 3034 struct pf_state_key *sk = NULL, *nk = NULL; 3035 u_short reason; 3036 int rewrite = 0, hdrlen = 0; 3037 int tag = -1, rtableid = -1; 3038 int asd = 0; 3039 int match = 0; 3040 int state_icmp = 0; 3041 u_int16_t sport = 0, dport = 0; 3042 u_int16_t bproto_sum = 0, bip_sum = 0; 3043 u_int8_t icmptype = 0, icmpcode = 0; 3044 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3045 3046 PF_RULES_RASSERT(); 3047 3048 if (inp != NULL) { 3049 INP_LOCK_ASSERT(inp); 3050 pd->lookup.uid = inp->inp_cred->cr_uid; 3051 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3052 pd->lookup.done = 1; 3053 } 3054 3055 switch (pd->proto) { 3056 case IPPROTO_TCP: 3057 sport = th->th_sport; 3058 dport = th->th_dport; 3059 hdrlen = sizeof(*th); 3060 break; 3061 case IPPROTO_UDP: 3062 sport = pd->hdr.udp->uh_sport; 3063 dport = pd->hdr.udp->uh_dport; 3064 hdrlen = sizeof(*pd->hdr.udp); 3065 break; 3066#ifdef INET 3067 case IPPROTO_ICMP: 3068 if (pd->af != AF_INET) 3069 break; 3070 sport = dport = pd->hdr.icmp->icmp_id; 3071 hdrlen = sizeof(*pd->hdr.icmp); 3072 icmptype = pd->hdr.icmp->icmp_type; 3073 icmpcode = pd->hdr.icmp->icmp_code; 3074 3075 if (icmptype == ICMP_UNREACH || 3076 icmptype == ICMP_SOURCEQUENCH || 3077 icmptype == ICMP_REDIRECT || 3078 icmptype == ICMP_TIMXCEED || 3079 icmptype == ICMP_PARAMPROB) 3080 state_icmp++; 3081 break; 3082#endif /* INET */ 3083#ifdef INET6 3084 case IPPROTO_ICMPV6: 3085 if (af != AF_INET6) 3086 break; 3087 sport = dport = pd->hdr.icmp6->icmp6_id; 3088 hdrlen = sizeof(*pd->hdr.icmp6); 3089 icmptype = pd->hdr.icmp6->icmp6_type; 3090 icmpcode = pd->hdr.icmp6->icmp6_code; 3091 3092 if (icmptype == ICMP6_DST_UNREACH || 3093 icmptype == ICMP6_PACKET_TOO_BIG || 3094 icmptype == ICMP6_TIME_EXCEEDED || 3095 icmptype == ICMP6_PARAM_PROB) 3096 state_icmp++; 3097 break; 3098#endif /* INET6 */ 3099 default: 3100 sport = dport = hdrlen = 0; 3101 break; 3102 } 3103 3104 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3105 3106 /* check packet for BINAT/NAT/RDR */ 3107 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3108 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3109 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3110 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3111 3112 if (pd->ip_sum) 3113 bip_sum = *pd->ip_sum; 3114 3115 switch (pd->proto) { 3116 case IPPROTO_TCP: 3117 bproto_sum = th->th_sum; 3118 pd->proto_sum = &th->th_sum; 3119 3120 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3121 nk->port[pd->sidx] != sport) { 3122 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3123 &th->th_sum, &nk->addr[pd->sidx], 3124 nk->port[pd->sidx], 0, af); 3125 pd->sport = &th->th_sport; 3126 sport = th->th_sport; 3127 } 3128 3129 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3130 nk->port[pd->didx] != dport) { 3131 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3132 &th->th_sum, &nk->addr[pd->didx], 3133 nk->port[pd->didx], 0, af); 3134 dport = th->th_dport; 3135 pd->dport = &th->th_dport; 3136 } 3137 rewrite++; 3138 break; 3139 case IPPROTO_UDP: 3140 bproto_sum = pd->hdr.udp->uh_sum; 3141 pd->proto_sum = &pd->hdr.udp->uh_sum; 3142 3143 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3144 nk->port[pd->sidx] != sport) { 3145 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3146 pd->ip_sum, &pd->hdr.udp->uh_sum, 3147 &nk->addr[pd->sidx], 3148 nk->port[pd->sidx], 1, af); 3149 sport = pd->hdr.udp->uh_sport; 3150 pd->sport = &pd->hdr.udp->uh_sport; 3151 } 3152 3153 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3154 nk->port[pd->didx] != dport) { 3155 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3156 pd->ip_sum, &pd->hdr.udp->uh_sum, 3157 &nk->addr[pd->didx], 3158 nk->port[pd->didx], 1, af); 3159 dport = pd->hdr.udp->uh_dport; 3160 pd->dport = &pd->hdr.udp->uh_dport; 3161 } 3162 rewrite++; 3163 break; 3164#ifdef INET 3165 case IPPROTO_ICMP: 3166 nk->port[0] = nk->port[1]; 3167 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3168 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3169 nk->addr[pd->sidx].v4.s_addr, 0); 3170 3171 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3172 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3173 nk->addr[pd->didx].v4.s_addr, 0); 3174 3175 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3176 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3177 pd->hdr.icmp->icmp_cksum, sport, 3178 nk->port[1], 0); 3179 pd->hdr.icmp->icmp_id = nk->port[1]; 3180 pd->sport = &pd->hdr.icmp->icmp_id; 3181 } 3182 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3183 break; 3184#endif /* INET */ 3185#ifdef INET6 3186 case IPPROTO_ICMPV6: 3187 nk->port[0] = nk->port[1]; 3188 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3189 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3190 &nk->addr[pd->sidx], 0); 3191 3192 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3193 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3194 &nk->addr[pd->didx], 0); 3195 rewrite++; 3196 break; 3197#endif /* INET */ 3198 default: 3199 switch (af) { 3200#ifdef INET 3201 case AF_INET: 3202 if (PF_ANEQ(saddr, 3203 &nk->addr[pd->sidx], AF_INET)) 3204 pf_change_a(&saddr->v4.s_addr, 3205 pd->ip_sum, 3206 nk->addr[pd->sidx].v4.s_addr, 0); 3207 3208 if (PF_ANEQ(daddr, 3209 &nk->addr[pd->didx], AF_INET)) 3210 pf_change_a(&daddr->v4.s_addr, 3211 pd->ip_sum, 3212 nk->addr[pd->didx].v4.s_addr, 0); 3213 break; 3214#endif /* INET */ 3215#ifdef INET6 3216 case AF_INET6: 3217 if (PF_ANEQ(saddr, 3218 &nk->addr[pd->sidx], AF_INET6)) 3219 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3220 3221 if (PF_ANEQ(daddr, 3222 &nk->addr[pd->didx], AF_INET6)) 3223 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3224 break; 3225#endif /* INET */ 3226 } 3227 break; 3228 } 3229 if (nr->natpass) 3230 r = NULL; 3231 pd->nat_rule = nr; 3232 } 3233 3234 while (r != NULL) { 3235 r->evaluations++; 3236 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3237 r = r->skip[PF_SKIP_IFP].ptr; 3238 else if (r->direction && r->direction != direction) 3239 r = r->skip[PF_SKIP_DIR].ptr; 3240 else if (r->af && r->af != af) 3241 r = r->skip[PF_SKIP_AF].ptr; 3242 else if (r->proto && r->proto != pd->proto) 3243 r = r->skip[PF_SKIP_PROTO].ptr; 3244 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3245 r->src.neg, kif, M_GETFIB(m))) 3246 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3247 /* tcp/udp only. port_op always 0 in other cases */ 3248 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3249 r->src.port[0], r->src.port[1], sport)) 3250 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3251 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3252 r->dst.neg, NULL, M_GETFIB(m))) 3253 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3254 /* tcp/udp only. port_op always 0 in other cases */ 3255 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3256 r->dst.port[0], r->dst.port[1], dport)) 3257 r = r->skip[PF_SKIP_DST_PORT].ptr; 3258 /* icmp only. type always 0 in other cases */ 3259 else if (r->type && r->type != icmptype + 1) 3260 r = TAILQ_NEXT(r, entries); 3261 /* icmp only. type always 0 in other cases */ 3262 else if (r->code && r->code != icmpcode + 1) 3263 r = TAILQ_NEXT(r, entries); 3264 else if (r->tos && !(r->tos == pd->tos)) 3265 r = TAILQ_NEXT(r, entries); 3266 else if (r->rule_flag & PFRULE_FRAGMENT) 3267 r = TAILQ_NEXT(r, entries); 3268 else if (pd->proto == IPPROTO_TCP && 3269 (r->flagset & th->th_flags) != r->flags) 3270 r = TAILQ_NEXT(r, entries); 3271 /* tcp/udp only. uid.op always 0 in other cases */ 3272 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3273 pf_socket_lookup(direction, pd, m), 1)) && 3274 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3275 pd->lookup.uid)) 3276 r = TAILQ_NEXT(r, entries); 3277 /* tcp/udp only. gid.op always 0 in other cases */ 3278 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3279 pf_socket_lookup(direction, pd, m), 1)) && 3280 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3281 pd->lookup.gid)) 3282 r = TAILQ_NEXT(r, entries); 3283 else if (r->prob && 3284 r->prob <= arc4random()) 3285 r = TAILQ_NEXT(r, entries); 3286 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3287 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3288 r = TAILQ_NEXT(r, entries); 3289 else if (r->os_fingerprint != PF_OSFP_ANY && 3290 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3291 pf_osfp_fingerprint(pd, m, off, th), 3292 r->os_fingerprint))) 3293 r = TAILQ_NEXT(r, entries); 3294 else { 3295 if (r->tag) 3296 tag = r->tag; 3297 if (r->rtableid >= 0) 3298 rtableid = r->rtableid; 3299 if (r->anchor == NULL) { 3300 match = 1; 3301 *rm = r; 3302 *am = a; 3303 *rsm = ruleset; 3304 if ((*rm)->quick) 3305 break; 3306 r = TAILQ_NEXT(r, entries); 3307 } else 3308 pf_step_into_anchor(anchor_stack, &asd, 3309 &ruleset, PF_RULESET_FILTER, &r, &a, 3310 &match); 3311 } 3312 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3313 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3314 break; 3315 } 3316 r = *rm; 3317 a = *am; 3318 ruleset = *rsm; 3319 3320 REASON_SET(&reason, PFRES_MATCH); 3321 3322 if (r->log || (nr != NULL && nr->log)) { 3323 if (rewrite) 3324 m_copyback(m, off, hdrlen, pd->hdr.any); 3325 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3326 ruleset, pd, 1); 3327 } 3328 3329 if ((r->action == PF_DROP) && 3330 ((r->rule_flag & PFRULE_RETURNRST) || 3331 (r->rule_flag & PFRULE_RETURNICMP) || 3332 (r->rule_flag & PFRULE_RETURN))) { 3333 /* undo NAT changes, if they have taken place */ 3334 if (nr != NULL) { 3335 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3336 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3337 if (pd->sport) 3338 *pd->sport = sk->port[pd->sidx]; 3339 if (pd->dport) 3340 *pd->dport = sk->port[pd->didx]; 3341 if (pd->proto_sum) 3342 *pd->proto_sum = bproto_sum; 3343 if (pd->ip_sum) 3344 *pd->ip_sum = bip_sum; 3345 m_copyback(m, off, hdrlen, pd->hdr.any); 3346 } 3347 if (pd->proto == IPPROTO_TCP && 3348 ((r->rule_flag & PFRULE_RETURNRST) || 3349 (r->rule_flag & PFRULE_RETURN)) && 3350 !(th->th_flags & TH_RST)) { 3351 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3352 int len = 0; 3353#ifdef INET 3354 struct ip *h4; 3355#endif 3356#ifdef INET6 3357 struct ip6_hdr *h6; 3358#endif 3359 3360 switch (af) { 3361#ifdef INET 3362 case AF_INET: 3363 h4 = mtod(m, struct ip *); 3364 len = ntohs(h4->ip_len) - off; 3365 break; 3366#endif 3367#ifdef INET6 3368 case AF_INET6: 3369 h6 = mtod(m, struct ip6_hdr *); 3370 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3371 break; 3372#endif 3373 } 3374 3375 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3376 REASON_SET(&reason, PFRES_PROTCKSUM); 3377 else { 3378 if (th->th_flags & TH_SYN) 3379 ack++; 3380 if (th->th_flags & TH_FIN) 3381 ack++; 3382 pf_send_tcp(m, r, af, pd->dst, 3383 pd->src, th->th_dport, th->th_sport, 3384 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3385 r->return_ttl, 1, 0, kif->pfik_ifp); 3386 } 3387 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3388 r->return_icmp) 3389 pf_send_icmp(m, r->return_icmp >> 8, 3390 r->return_icmp & 255, af, r); 3391 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3392 r->return_icmp6) 3393 pf_send_icmp(m, r->return_icmp6 >> 8, 3394 r->return_icmp6 & 255, af, r); 3395 } 3396 3397 if (r->action == PF_DROP) 3398 goto cleanup; 3399 3400 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3401 REASON_SET(&reason, PFRES_MEMORY); 3402 goto cleanup; 3403 } 3404 if (rtableid >= 0) 3405 M_SETFIB(m, rtableid); 3406 3407 if (!state_icmp && (r->keep_state || nr != NULL || 3408 (pd->flags & PFDESC_TCP_NORM))) { 3409 int action; 3410 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3411 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3412 hdrlen); 3413 if (action != PF_PASS) 3414 return (action); 3415 } else { 3416 if (sk != NULL) 3417 uma_zfree(V_pf_state_key_z, sk); 3418 if (nk != NULL) 3419 uma_zfree(V_pf_state_key_z, nk); 3420 } 3421 3422 /* copy back packet headers if we performed NAT operations */ 3423 if (rewrite) 3424 m_copyback(m, off, hdrlen, pd->hdr.any); 3425 3426 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3427 direction == PF_OUT && 3428 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3429 /* 3430 * We want the state created, but we dont 3431 * want to send this in case a partner 3432 * firewall has to know about it to allow 3433 * replies through it. 3434 */ 3435 return (PF_DEFER); 3436 3437 return (PF_PASS); 3438 3439cleanup: 3440 if (sk != NULL) 3441 uma_zfree(V_pf_state_key_z, sk); 3442 if (nk != NULL) 3443 uma_zfree(V_pf_state_key_z, nk); 3444 return (PF_DROP); 3445} 3446 3447static int 3448pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3449 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3450 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3451 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3452 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3453{ 3454 struct pf_state *s = NULL; 3455 struct pf_src_node *sn = NULL; 3456 struct tcphdr *th = pd->hdr.tcp; 3457 u_int16_t mss = V_tcp_mssdflt; 3458 u_short reason; 3459 3460 /* check maximums */ 3461 if (r->max_states && 3462 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 3463 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 3464 REASON_SET(&reason, PFRES_MAXSTATES); 3465 return (PF_DROP); 3466 } 3467 /* src node for filter rule */ 3468 if ((r->rule_flag & PFRULE_SRCTRACK || 3469 r->rpool.opts & PF_POOL_STICKYADDR) && 3470 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3471 REASON_SET(&reason, PFRES_SRCLIMIT); 3472 goto csfailed; 3473 } 3474 /* src node for translation rule */ 3475 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3476 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3477 REASON_SET(&reason, PFRES_SRCLIMIT); 3478 goto csfailed; 3479 } 3480 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3481 if (s == NULL) { 3482 REASON_SET(&reason, PFRES_MEMORY); 3483 goto csfailed; 3484 } 3485 s->rule.ptr = r; 3486 s->nat_rule.ptr = nr; 3487 s->anchor.ptr = a; 3488 STATE_INC_COUNTERS(s); 3489 if (r->allow_opts) 3490 s->state_flags |= PFSTATE_ALLOWOPTS; 3491 if (r->rule_flag & PFRULE_STATESLOPPY) 3492 s->state_flags |= PFSTATE_SLOPPY; 3493 s->log = r->log & PF_LOG_ALL; 3494 s->sync_state = PFSYNC_S_NONE; 3495 if (nr != NULL) 3496 s->log |= nr->log & PF_LOG_ALL; 3497 switch (pd->proto) { 3498 case IPPROTO_TCP: 3499 s->src.seqlo = ntohl(th->th_seq); 3500 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3501 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3502 r->keep_state == PF_STATE_MODULATE) { 3503 /* Generate sequence number modulator */ 3504 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3505 0) 3506 s->src.seqdiff = 1; 3507 pf_change_a(&th->th_seq, &th->th_sum, 3508 htonl(s->src.seqlo + s->src.seqdiff), 0); 3509 *rewrite = 1; 3510 } else 3511 s->src.seqdiff = 0; 3512 if (th->th_flags & TH_SYN) { 3513 s->src.seqhi++; 3514 s->src.wscale = pf_get_wscale(m, off, 3515 th->th_off, pd->af); 3516 } 3517 s->src.max_win = MAX(ntohs(th->th_win), 1); 3518 if (s->src.wscale & PF_WSCALE_MASK) { 3519 /* Remove scale factor from initial window */ 3520 int win = s->src.max_win; 3521 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3522 s->src.max_win = (win - 1) >> 3523 (s->src.wscale & PF_WSCALE_MASK); 3524 } 3525 if (th->th_flags & TH_FIN) 3526 s->src.seqhi++; 3527 s->dst.seqhi = 1; 3528 s->dst.max_win = 1; 3529 s->src.state = TCPS_SYN_SENT; 3530 s->dst.state = TCPS_CLOSED; 3531 s->timeout = PFTM_TCP_FIRST_PACKET; 3532 break; 3533 case IPPROTO_UDP: 3534 s->src.state = PFUDPS_SINGLE; 3535 s->dst.state = PFUDPS_NO_TRAFFIC; 3536 s->timeout = PFTM_UDP_FIRST_PACKET; 3537 break; 3538 case IPPROTO_ICMP: 3539#ifdef INET6 3540 case IPPROTO_ICMPV6: 3541#endif 3542 s->timeout = PFTM_ICMP_FIRST_PACKET; 3543 break; 3544 default: 3545 s->src.state = PFOTHERS_SINGLE; 3546 s->dst.state = PFOTHERS_NO_TRAFFIC; 3547 s->timeout = PFTM_OTHER_FIRST_PACKET; 3548 } 3549 3550 s->creation = time_uptime; 3551 s->expire = time_uptime; 3552 3553 if (sn != NULL) { 3554 s->src_node = sn; 3555 s->src_node->states++; 3556 } 3557 if (nsn != NULL) { 3558 /* XXX We only modify one side for now. */ 3559 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3560 s->nat_src_node = nsn; 3561 s->nat_src_node->states++; 3562 } 3563 if (pd->proto == IPPROTO_TCP) { 3564 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3565 off, pd, th, &s->src, &s->dst)) { 3566 REASON_SET(&reason, PFRES_MEMORY); 3567 pf_src_tree_remove_state(s); 3568 STATE_DEC_COUNTERS(s); 3569 uma_zfree(V_pf_state_z, s); 3570 return (PF_DROP); 3571 } 3572 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3573 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3574 &s->src, &s->dst, rewrite)) { 3575 /* This really shouldn't happen!!! */ 3576 DPFPRINTF(PF_DEBUG_URGENT, 3577 ("pf_normalize_tcp_stateful failed on first pkt")); 3578 pf_normalize_tcp_cleanup(s); 3579 pf_src_tree_remove_state(s); 3580 STATE_DEC_COUNTERS(s); 3581 uma_zfree(V_pf_state_z, s); 3582 return (PF_DROP); 3583 } 3584 } 3585 s->direction = pd->dir; 3586 3587 /* 3588 * sk/nk could already been setup by pf_get_translation(). 3589 */ 3590 if (nr == NULL) { 3591 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3592 __func__, nr, sk, nk)); 3593 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3594 if (sk == NULL) 3595 goto csfailed; 3596 nk = sk; 3597 } else 3598 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3599 __func__, nr, sk, nk)); 3600 3601 /* Swap sk/nk for PF_OUT. */ 3602 if (pf_state_insert(BOUND_IFACE(r, kif), 3603 (pd->dir == PF_IN) ? sk : nk, 3604 (pd->dir == PF_IN) ? nk : sk, s)) { 3605 if (pd->proto == IPPROTO_TCP) 3606 pf_normalize_tcp_cleanup(s); 3607 REASON_SET(&reason, PFRES_STATEINS); 3608 pf_src_tree_remove_state(s); 3609 STATE_DEC_COUNTERS(s); 3610 uma_zfree(V_pf_state_z, s); 3611 return (PF_DROP); 3612 } else 3613 *sm = s; 3614 3615 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ 3616 if (tag > 0) 3617 s->tag = tag; 3618 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3619 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3620 s->src.state = PF_TCPS_PROXY_SRC; 3621 /* undo NAT changes, if they have taken place */ 3622 if (nr != NULL) { 3623 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3624 if (pd->dir == PF_OUT) 3625 skt = s->key[PF_SK_STACK]; 3626 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3627 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3628 if (pd->sport) 3629 *pd->sport = skt->port[pd->sidx]; 3630 if (pd->dport) 3631 *pd->dport = skt->port[pd->didx]; 3632 if (pd->proto_sum) 3633 *pd->proto_sum = bproto_sum; 3634 if (pd->ip_sum) 3635 *pd->ip_sum = bip_sum; 3636 m_copyback(m, off, hdrlen, pd->hdr.any); 3637 } 3638 s->src.seqhi = htonl(arc4random()); 3639 /* Find mss option */ 3640 int rtid = M_GETFIB(m); 3641 mss = pf_get_mss(m, off, th->th_off, pd->af); 3642 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3643 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3644 s->src.mss = mss; 3645 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3646 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3647 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3648 REASON_SET(&reason, PFRES_SYNPROXY); 3649 return (PF_SYNPROXY_DROP); 3650 } 3651 3652 return (PF_PASS); 3653 3654csfailed: 3655 if (sk != NULL) 3656 uma_zfree(V_pf_state_key_z, sk); 3657 if (nk != NULL) 3658 uma_zfree(V_pf_state_key_z, nk); 3659 3660 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3661 pf_unlink_src_node(sn); 3662 pf_free_src_node(sn); 3663 } 3664 3665 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 3666 pf_unlink_src_node(nsn); 3667 pf_free_src_node(nsn); 3668 } 3669 3670 return (PF_DROP); 3671} 3672 3673static int 3674pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3675 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3676 struct pf_ruleset **rsm) 3677{ 3678 struct pf_rule *r, *a = NULL; 3679 struct pf_ruleset *ruleset = NULL; 3680 sa_family_t af = pd->af; 3681 u_short reason; 3682 int tag = -1; 3683 int asd = 0; 3684 int match = 0; 3685 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3686 3687 PF_RULES_RASSERT(); 3688 3689 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3690 while (r != NULL) { 3691 r->evaluations++; 3692 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3693 r = r->skip[PF_SKIP_IFP].ptr; 3694 else if (r->direction && r->direction != direction) 3695 r = r->skip[PF_SKIP_DIR].ptr; 3696 else if (r->af && r->af != af) 3697 r = r->skip[PF_SKIP_AF].ptr; 3698 else if (r->proto && r->proto != pd->proto) 3699 r = r->skip[PF_SKIP_PROTO].ptr; 3700 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3701 r->src.neg, kif, M_GETFIB(m))) 3702 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3703 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3704 r->dst.neg, NULL, M_GETFIB(m))) 3705 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3706 else if (r->tos && !(r->tos == pd->tos)) 3707 r = TAILQ_NEXT(r, entries); 3708 else if (r->os_fingerprint != PF_OSFP_ANY) 3709 r = TAILQ_NEXT(r, entries); 3710 else if (pd->proto == IPPROTO_UDP && 3711 (r->src.port_op || r->dst.port_op)) 3712 r = TAILQ_NEXT(r, entries); 3713 else if (pd->proto == IPPROTO_TCP && 3714 (r->src.port_op || r->dst.port_op || r->flagset)) 3715 r = TAILQ_NEXT(r, entries); 3716 else if ((pd->proto == IPPROTO_ICMP || 3717 pd->proto == IPPROTO_ICMPV6) && 3718 (r->type || r->code)) 3719 r = TAILQ_NEXT(r, entries); 3720 else if (r->prob && r->prob <= 3721 (arc4random() % (UINT_MAX - 1) + 1)) 3722 r = TAILQ_NEXT(r, entries); 3723 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3724 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3725 r = TAILQ_NEXT(r, entries); 3726 else { 3727 if (r->anchor == NULL) { 3728 match = 1; 3729 *rm = r; 3730 *am = a; 3731 *rsm = ruleset; 3732 if ((*rm)->quick) 3733 break; 3734 r = TAILQ_NEXT(r, entries); 3735 } else 3736 pf_step_into_anchor(anchor_stack, &asd, 3737 &ruleset, PF_RULESET_FILTER, &r, &a, 3738 &match); 3739 } 3740 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3741 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3742 break; 3743 } 3744 r = *rm; 3745 a = *am; 3746 ruleset = *rsm; 3747 3748 REASON_SET(&reason, PFRES_MATCH); 3749 3750 if (r->log) 3751 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3752 1); 3753 3754 if (r->action != PF_PASS) 3755 return (PF_DROP); 3756 3757 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3758 REASON_SET(&reason, PFRES_MEMORY); 3759 return (PF_DROP); 3760 } 3761 3762 return (PF_PASS); 3763} 3764 3765static int 3766pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3767 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3768 struct pf_pdesc *pd, u_short *reason, int *copyback) 3769{ 3770 struct tcphdr *th = pd->hdr.tcp; 3771 u_int16_t win = ntohs(th->th_win); 3772 u_int32_t ack, end, seq, orig_seq; 3773 u_int8_t sws, dws; 3774 int ackskew; 3775 3776 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3777 sws = src->wscale & PF_WSCALE_MASK; 3778 dws = dst->wscale & PF_WSCALE_MASK; 3779 } else 3780 sws = dws = 0; 3781 3782 /* 3783 * Sequence tracking algorithm from Guido van Rooij's paper: 3784 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3785 * tcp_filtering.ps 3786 */ 3787 3788 orig_seq = seq = ntohl(th->th_seq); 3789 if (src->seqlo == 0) { 3790 /* First packet from this end. Set its state */ 3791 3792 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3793 src->scrub == NULL) { 3794 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3795 REASON_SET(reason, PFRES_MEMORY); 3796 return (PF_DROP); 3797 } 3798 } 3799 3800 /* Deferred generation of sequence number modulator */ 3801 if (dst->seqdiff && !src->seqdiff) { 3802 /* use random iss for the TCP server */ 3803 while ((src->seqdiff = arc4random() - seq) == 0) 3804 ; 3805 ack = ntohl(th->th_ack) - dst->seqdiff; 3806 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3807 src->seqdiff), 0); 3808 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3809 *copyback = 1; 3810 } else { 3811 ack = ntohl(th->th_ack); 3812 } 3813 3814 end = seq + pd->p_len; 3815 if (th->th_flags & TH_SYN) { 3816 end++; 3817 if (dst->wscale & PF_WSCALE_FLAG) { 3818 src->wscale = pf_get_wscale(m, off, th->th_off, 3819 pd->af); 3820 if (src->wscale & PF_WSCALE_FLAG) { 3821 /* Remove scale factor from initial 3822 * window */ 3823 sws = src->wscale & PF_WSCALE_MASK; 3824 win = ((u_int32_t)win + (1 << sws) - 1) 3825 >> sws; 3826 dws = dst->wscale & PF_WSCALE_MASK; 3827 } else { 3828 /* fixup other window */ 3829 dst->max_win <<= dst->wscale & 3830 PF_WSCALE_MASK; 3831 /* in case of a retrans SYN|ACK */ 3832 dst->wscale = 0; 3833 } 3834 } 3835 } 3836 if (th->th_flags & TH_FIN) 3837 end++; 3838 3839 src->seqlo = seq; 3840 if (src->state < TCPS_SYN_SENT) 3841 src->state = TCPS_SYN_SENT; 3842 3843 /* 3844 * May need to slide the window (seqhi may have been set by 3845 * the crappy stack check or if we picked up the connection 3846 * after establishment) 3847 */ 3848 if (src->seqhi == 1 || 3849 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3850 src->seqhi = end + MAX(1, dst->max_win << dws); 3851 if (win > src->max_win) 3852 src->max_win = win; 3853 3854 } else { 3855 ack = ntohl(th->th_ack) - dst->seqdiff; 3856 if (src->seqdiff) { 3857 /* Modulate sequence numbers */ 3858 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3859 src->seqdiff), 0); 3860 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3861 *copyback = 1; 3862 } 3863 end = seq + pd->p_len; 3864 if (th->th_flags & TH_SYN) 3865 end++; 3866 if (th->th_flags & TH_FIN) 3867 end++; 3868 } 3869 3870 if ((th->th_flags & TH_ACK) == 0) { 3871 /* Let it pass through the ack skew check */ 3872 ack = dst->seqlo; 3873 } else if ((ack == 0 && 3874 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3875 /* broken tcp stacks do not set ack */ 3876 (dst->state < TCPS_SYN_SENT)) { 3877 /* 3878 * Many stacks (ours included) will set the ACK number in an 3879 * FIN|ACK if the SYN times out -- no sequence to ACK. 3880 */ 3881 ack = dst->seqlo; 3882 } 3883 3884 if (seq == end) { 3885 /* Ease sequencing restrictions on no data packets */ 3886 seq = src->seqlo; 3887 end = seq; 3888 } 3889 3890 ackskew = dst->seqlo - ack; 3891 3892 3893 /* 3894 * Need to demodulate the sequence numbers in any TCP SACK options 3895 * (Selective ACK). We could optionally validate the SACK values 3896 * against the current ACK window, either forwards or backwards, but 3897 * I'm not confident that SACK has been implemented properly 3898 * everywhere. It wouldn't surprise me if several stacks accidently 3899 * SACK too far backwards of previously ACKed data. There really aren't 3900 * any security implications of bad SACKing unless the target stack 3901 * doesn't validate the option length correctly. Someone trying to 3902 * spoof into a TCP connection won't bother blindly sending SACK 3903 * options anyway. 3904 */ 3905 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 3906 if (pf_modulate_sack(m, off, pd, th, dst)) 3907 *copyback = 1; 3908 } 3909 3910 3911#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3912 if (SEQ_GEQ(src->seqhi, end) && 3913 /* Last octet inside other's window space */ 3914 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3915 /* Retrans: not more than one window back */ 3916 (ackskew >= -MAXACKWINDOW) && 3917 /* Acking not more than one reassembled fragment backwards */ 3918 (ackskew <= (MAXACKWINDOW << sws)) && 3919 /* Acking not more than one window forward */ 3920 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 3921 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 3922 (pd->flags & PFDESC_IP_REAS) == 0)) { 3923 /* Require an exact/+1 sequence match on resets when possible */ 3924 3925 if (dst->scrub || src->scrub) { 3926 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 3927 *state, src, dst, copyback)) 3928 return (PF_DROP); 3929 } 3930 3931 /* update max window */ 3932 if (src->max_win < win) 3933 src->max_win = win; 3934 /* synchronize sequencing */ 3935 if (SEQ_GT(end, src->seqlo)) 3936 src->seqlo = end; 3937 /* slide the window of what the other end can send */ 3938 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3939 dst->seqhi = ack + MAX((win << sws), 1); 3940 3941 3942 /* update states */ 3943 if (th->th_flags & TH_SYN) 3944 if (src->state < TCPS_SYN_SENT) 3945 src->state = TCPS_SYN_SENT; 3946 if (th->th_flags & TH_FIN) 3947 if (src->state < TCPS_CLOSING) 3948 src->state = TCPS_CLOSING; 3949 if (th->th_flags & TH_ACK) { 3950 if (dst->state == TCPS_SYN_SENT) { 3951 dst->state = TCPS_ESTABLISHED; 3952 if (src->state == TCPS_ESTABLISHED && 3953 (*state)->src_node != NULL && 3954 pf_src_connlimit(state)) { 3955 REASON_SET(reason, PFRES_SRCLIMIT); 3956 return (PF_DROP); 3957 } 3958 } else if (dst->state == TCPS_CLOSING) 3959 dst->state = TCPS_FIN_WAIT_2; 3960 } 3961 if (th->th_flags & TH_RST) 3962 src->state = dst->state = TCPS_TIME_WAIT; 3963 3964 /* update expire time */ 3965 (*state)->expire = time_uptime; 3966 if (src->state >= TCPS_FIN_WAIT_2 && 3967 dst->state >= TCPS_FIN_WAIT_2) 3968 (*state)->timeout = PFTM_TCP_CLOSED; 3969 else if (src->state >= TCPS_CLOSING && 3970 dst->state >= TCPS_CLOSING) 3971 (*state)->timeout = PFTM_TCP_FIN_WAIT; 3972 else if (src->state < TCPS_ESTABLISHED || 3973 dst->state < TCPS_ESTABLISHED) 3974 (*state)->timeout = PFTM_TCP_OPENING; 3975 else if (src->state >= TCPS_CLOSING || 3976 dst->state >= TCPS_CLOSING) 3977 (*state)->timeout = PFTM_TCP_CLOSING; 3978 else 3979 (*state)->timeout = PFTM_TCP_ESTABLISHED; 3980 3981 /* Fall through to PASS packet */ 3982 3983 } else if ((dst->state < TCPS_SYN_SENT || 3984 dst->state >= TCPS_FIN_WAIT_2 || 3985 src->state >= TCPS_FIN_WAIT_2) && 3986 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 3987 /* Within a window forward of the originating packet */ 3988 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 3989 /* Within a window backward of the originating packet */ 3990 3991 /* 3992 * This currently handles three situations: 3993 * 1) Stupid stacks will shotgun SYNs before their peer 3994 * replies. 3995 * 2) When PF catches an already established stream (the 3996 * firewall rebooted, the state table was flushed, routes 3997 * changed...) 3998 * 3) Packets get funky immediately after the connection 3999 * closes (this should catch Solaris spurious ACK|FINs 4000 * that web servers like to spew after a close) 4001 * 4002 * This must be a little more careful than the above code 4003 * since packet floods will also be caught here. We don't 4004 * update the TTL here to mitigate the damage of a packet 4005 * flood and so the same code can handle awkward establishment 4006 * and a loosened connection close. 4007 * In the establishment case, a correct peer response will 4008 * validate the connection, go through the normal state code 4009 * and keep updating the state TTL. 4010 */ 4011 4012 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4013 printf("pf: loose state match: "); 4014 pf_print_state(*state); 4015 pf_print_flags(th->th_flags); 4016 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4017 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4018 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4019 (unsigned long long)(*state)->packets[1], 4020 pd->dir == PF_IN ? "in" : "out", 4021 pd->dir == (*state)->direction ? "fwd" : "rev"); 4022 } 4023 4024 if (dst->scrub || src->scrub) { 4025 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4026 *state, src, dst, copyback)) 4027 return (PF_DROP); 4028 } 4029 4030 /* update max window */ 4031 if (src->max_win < win) 4032 src->max_win = win; 4033 /* synchronize sequencing */ 4034 if (SEQ_GT(end, src->seqlo)) 4035 src->seqlo = end; 4036 /* slide the window of what the other end can send */ 4037 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4038 dst->seqhi = ack + MAX((win << sws), 1); 4039 4040 /* 4041 * Cannot set dst->seqhi here since this could be a shotgunned 4042 * SYN and not an already established connection. 4043 */ 4044 4045 if (th->th_flags & TH_FIN) 4046 if (src->state < TCPS_CLOSING) 4047 src->state = TCPS_CLOSING; 4048 if (th->th_flags & TH_RST) 4049 src->state = dst->state = TCPS_TIME_WAIT; 4050 4051 /* Fall through to PASS packet */ 4052 4053 } else { 4054 if ((*state)->dst.state == TCPS_SYN_SENT && 4055 (*state)->src.state == TCPS_SYN_SENT) { 4056 /* Send RST for state mismatches during handshake */ 4057 if (!(th->th_flags & TH_RST)) 4058 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4059 pd->dst, pd->src, th->th_dport, 4060 th->th_sport, ntohl(th->th_ack), 0, 4061 TH_RST, 0, 0, 4062 (*state)->rule.ptr->return_ttl, 1, 0, 4063 kif->pfik_ifp); 4064 src->seqlo = 0; 4065 src->seqhi = 1; 4066 src->max_win = 1; 4067 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4068 printf("pf: BAD state: "); 4069 pf_print_state(*state); 4070 pf_print_flags(th->th_flags); 4071 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4072 "pkts=%llu:%llu dir=%s,%s\n", 4073 seq, orig_seq, ack, pd->p_len, ackskew, 4074 (unsigned long long)(*state)->packets[0], 4075 (unsigned long long)(*state)->packets[1], 4076 pd->dir == PF_IN ? "in" : "out", 4077 pd->dir == (*state)->direction ? "fwd" : "rev"); 4078 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4079 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4080 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4081 ' ': '2', 4082 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4083 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4084 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4085 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4086 } 4087 REASON_SET(reason, PFRES_BADSTATE); 4088 return (PF_DROP); 4089 } 4090 4091 return (PF_PASS); 4092} 4093 4094static int 4095pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4096 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4097{ 4098 struct tcphdr *th = pd->hdr.tcp; 4099 4100 if (th->th_flags & TH_SYN) 4101 if (src->state < TCPS_SYN_SENT) 4102 src->state = TCPS_SYN_SENT; 4103 if (th->th_flags & TH_FIN) 4104 if (src->state < TCPS_CLOSING) 4105 src->state = TCPS_CLOSING; 4106 if (th->th_flags & TH_ACK) { 4107 if (dst->state == TCPS_SYN_SENT) { 4108 dst->state = TCPS_ESTABLISHED; 4109 if (src->state == TCPS_ESTABLISHED && 4110 (*state)->src_node != NULL && 4111 pf_src_connlimit(state)) { 4112 REASON_SET(reason, PFRES_SRCLIMIT); 4113 return (PF_DROP); 4114 } 4115 } else if (dst->state == TCPS_CLOSING) { 4116 dst->state = TCPS_FIN_WAIT_2; 4117 } else if (src->state == TCPS_SYN_SENT && 4118 dst->state < TCPS_SYN_SENT) { 4119 /* 4120 * Handle a special sloppy case where we only see one 4121 * half of the connection. If there is a ACK after 4122 * the initial SYN without ever seeing a packet from 4123 * the destination, set the connection to established. 4124 */ 4125 dst->state = src->state = TCPS_ESTABLISHED; 4126 if ((*state)->src_node != NULL && 4127 pf_src_connlimit(state)) { 4128 REASON_SET(reason, PFRES_SRCLIMIT); 4129 return (PF_DROP); 4130 } 4131 } else if (src->state == TCPS_CLOSING && 4132 dst->state == TCPS_ESTABLISHED && 4133 dst->seqlo == 0) { 4134 /* 4135 * Handle the closing of half connections where we 4136 * don't see the full bidirectional FIN/ACK+ACK 4137 * handshake. 4138 */ 4139 dst->state = TCPS_CLOSING; 4140 } 4141 } 4142 if (th->th_flags & TH_RST) 4143 src->state = dst->state = TCPS_TIME_WAIT; 4144 4145 /* update expire time */ 4146 (*state)->expire = time_uptime; 4147 if (src->state >= TCPS_FIN_WAIT_2 && 4148 dst->state >= TCPS_FIN_WAIT_2) 4149 (*state)->timeout = PFTM_TCP_CLOSED; 4150 else if (src->state >= TCPS_CLOSING && 4151 dst->state >= TCPS_CLOSING) 4152 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4153 else if (src->state < TCPS_ESTABLISHED || 4154 dst->state < TCPS_ESTABLISHED) 4155 (*state)->timeout = PFTM_TCP_OPENING; 4156 else if (src->state >= TCPS_CLOSING || 4157 dst->state >= TCPS_CLOSING) 4158 (*state)->timeout = PFTM_TCP_CLOSING; 4159 else 4160 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4161 4162 return (PF_PASS); 4163} 4164 4165static int 4166pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4167 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4168 u_short *reason) 4169{ 4170 struct pf_state_key_cmp key; 4171 struct tcphdr *th = pd->hdr.tcp; 4172 int copyback = 0; 4173 struct pf_state_peer *src, *dst; 4174 struct pf_state_key *sk; 4175 4176 bzero(&key, sizeof(key)); 4177 key.af = pd->af; 4178 key.proto = IPPROTO_TCP; 4179 if (direction == PF_IN) { /* wire side, straight */ 4180 PF_ACPY(&key.addr[0], pd->src, key.af); 4181 PF_ACPY(&key.addr[1], pd->dst, key.af); 4182 key.port[0] = th->th_sport; 4183 key.port[1] = th->th_dport; 4184 } else { /* stack side, reverse */ 4185 PF_ACPY(&key.addr[1], pd->src, key.af); 4186 PF_ACPY(&key.addr[0], pd->dst, key.af); 4187 key.port[1] = th->th_sport; 4188 key.port[0] = th->th_dport; 4189 } 4190 4191 STATE_LOOKUP(kif, &key, direction, *state, pd); 4192 4193 if (direction == (*state)->direction) { 4194 src = &(*state)->src; 4195 dst = &(*state)->dst; 4196 } else { 4197 src = &(*state)->dst; 4198 dst = &(*state)->src; 4199 } 4200 4201 sk = (*state)->key[pd->didx]; 4202 4203 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4204 if (direction != (*state)->direction) { 4205 REASON_SET(reason, PFRES_SYNPROXY); 4206 return (PF_SYNPROXY_DROP); 4207 } 4208 if (th->th_flags & TH_SYN) { 4209 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4210 REASON_SET(reason, PFRES_SYNPROXY); 4211 return (PF_DROP); 4212 } 4213 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4214 pd->src, th->th_dport, th->th_sport, 4215 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4216 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4217 REASON_SET(reason, PFRES_SYNPROXY); 4218 return (PF_SYNPROXY_DROP); 4219 } else if (!(th->th_flags & TH_ACK) || 4220 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4221 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4222 REASON_SET(reason, PFRES_SYNPROXY); 4223 return (PF_DROP); 4224 } else if ((*state)->src_node != NULL && 4225 pf_src_connlimit(state)) { 4226 REASON_SET(reason, PFRES_SRCLIMIT); 4227 return (PF_DROP); 4228 } else 4229 (*state)->src.state = PF_TCPS_PROXY_DST; 4230 } 4231 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4232 if (direction == (*state)->direction) { 4233 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4234 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4235 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4236 REASON_SET(reason, PFRES_SYNPROXY); 4237 return (PF_DROP); 4238 } 4239 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4240 if ((*state)->dst.seqhi == 1) 4241 (*state)->dst.seqhi = htonl(arc4random()); 4242 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4243 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4244 sk->port[pd->sidx], sk->port[pd->didx], 4245 (*state)->dst.seqhi, 0, TH_SYN, 0, 4246 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4247 REASON_SET(reason, PFRES_SYNPROXY); 4248 return (PF_SYNPROXY_DROP); 4249 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4250 (TH_SYN|TH_ACK)) || 4251 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4252 REASON_SET(reason, PFRES_SYNPROXY); 4253 return (PF_DROP); 4254 } else { 4255 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4256 (*state)->dst.seqlo = ntohl(th->th_seq); 4257 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4258 pd->src, th->th_dport, th->th_sport, 4259 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4260 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4261 (*state)->tag, NULL); 4262 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4263 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4264 sk->port[pd->sidx], sk->port[pd->didx], 4265 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4266 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4267 (*state)->src.seqdiff = (*state)->dst.seqhi - 4268 (*state)->src.seqlo; 4269 (*state)->dst.seqdiff = (*state)->src.seqhi - 4270 (*state)->dst.seqlo; 4271 (*state)->src.seqhi = (*state)->src.seqlo + 4272 (*state)->dst.max_win; 4273 (*state)->dst.seqhi = (*state)->dst.seqlo + 4274 (*state)->src.max_win; 4275 (*state)->src.wscale = (*state)->dst.wscale = 0; 4276 (*state)->src.state = (*state)->dst.state = 4277 TCPS_ESTABLISHED; 4278 REASON_SET(reason, PFRES_SYNPROXY); 4279 return (PF_SYNPROXY_DROP); 4280 } 4281 } 4282 4283 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4284 dst->state >= TCPS_FIN_WAIT_2 && 4285 src->state >= TCPS_FIN_WAIT_2) { 4286 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4287 printf("pf: state reuse "); 4288 pf_print_state(*state); 4289 pf_print_flags(th->th_flags); 4290 printf("\n"); 4291 } 4292 /* XXX make sure it's the same direction ?? */ 4293 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4294 pf_unlink_state(*state, PF_ENTER_LOCKED); 4295 *state = NULL; 4296 return (PF_DROP); 4297 } 4298 4299 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4300 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4301 return (PF_DROP); 4302 } else { 4303 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4304 ©back) == PF_DROP) 4305 return (PF_DROP); 4306 } 4307 4308 /* translate source/destination address, if necessary */ 4309 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4310 struct pf_state_key *nk = (*state)->key[pd->didx]; 4311 4312 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4313 nk->port[pd->sidx] != th->th_sport) 4314 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4315 &th->th_sum, &nk->addr[pd->sidx], 4316 nk->port[pd->sidx], 0, pd->af); 4317 4318 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4319 nk->port[pd->didx] != th->th_dport) 4320 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4321 &th->th_sum, &nk->addr[pd->didx], 4322 nk->port[pd->didx], 0, pd->af); 4323 copyback = 1; 4324 } 4325 4326 /* Copyback sequence modulation or stateful scrub changes if needed */ 4327 if (copyback) 4328 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4329 4330 return (PF_PASS); 4331} 4332 4333static int 4334pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4335 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4336{ 4337 struct pf_state_peer *src, *dst; 4338 struct pf_state_key_cmp key; 4339 struct udphdr *uh = pd->hdr.udp; 4340 4341 bzero(&key, sizeof(key)); 4342 key.af = pd->af; 4343 key.proto = IPPROTO_UDP; 4344 if (direction == PF_IN) { /* wire side, straight */ 4345 PF_ACPY(&key.addr[0], pd->src, key.af); 4346 PF_ACPY(&key.addr[1], pd->dst, key.af); 4347 key.port[0] = uh->uh_sport; 4348 key.port[1] = uh->uh_dport; 4349 } else { /* stack side, reverse */ 4350 PF_ACPY(&key.addr[1], pd->src, key.af); 4351 PF_ACPY(&key.addr[0], pd->dst, key.af); 4352 key.port[1] = uh->uh_sport; 4353 key.port[0] = uh->uh_dport; 4354 } 4355 4356 STATE_LOOKUP(kif, &key, direction, *state, pd); 4357 4358 if (direction == (*state)->direction) { 4359 src = &(*state)->src; 4360 dst = &(*state)->dst; 4361 } else { 4362 src = &(*state)->dst; 4363 dst = &(*state)->src; 4364 } 4365 4366 /* update states */ 4367 if (src->state < PFUDPS_SINGLE) 4368 src->state = PFUDPS_SINGLE; 4369 if (dst->state == PFUDPS_SINGLE) 4370 dst->state = PFUDPS_MULTIPLE; 4371 4372 /* update expire time */ 4373 (*state)->expire = time_uptime; 4374 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4375 (*state)->timeout = PFTM_UDP_MULTIPLE; 4376 else 4377 (*state)->timeout = PFTM_UDP_SINGLE; 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] != uh->uh_sport) 4385 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4386 &uh->uh_sum, &nk->addr[pd->sidx], 4387 nk->port[pd->sidx], 1, pd->af); 4388 4389 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4390 nk->port[pd->didx] != uh->uh_dport) 4391 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4392 &uh->uh_sum, &nk->addr[pd->didx], 4393 nk->port[pd->didx], 1, pd->af); 4394 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4395 } 4396 4397 return (PF_PASS); 4398} 4399 4400static int 4401pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4402 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4403{ 4404 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4405 u_int16_t icmpid = 0, *icmpsum; 4406 u_int8_t icmptype; 4407 int state_icmp = 0; 4408 struct pf_state_key_cmp key; 4409 4410 bzero(&key, sizeof(key)); 4411 switch (pd->proto) { 4412#ifdef INET 4413 case IPPROTO_ICMP: 4414 icmptype = pd->hdr.icmp->icmp_type; 4415 icmpid = pd->hdr.icmp->icmp_id; 4416 icmpsum = &pd->hdr.icmp->icmp_cksum; 4417 4418 if (icmptype == ICMP_UNREACH || 4419 icmptype == ICMP_SOURCEQUENCH || 4420 icmptype == ICMP_REDIRECT || 4421 icmptype == ICMP_TIMXCEED || 4422 icmptype == ICMP_PARAMPROB) 4423 state_icmp++; 4424 break; 4425#endif /* INET */ 4426#ifdef INET6 4427 case IPPROTO_ICMPV6: 4428 icmptype = pd->hdr.icmp6->icmp6_type; 4429 icmpid = pd->hdr.icmp6->icmp6_id; 4430 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4431 4432 if (icmptype == ICMP6_DST_UNREACH || 4433 icmptype == ICMP6_PACKET_TOO_BIG || 4434 icmptype == ICMP6_TIME_EXCEEDED || 4435 icmptype == ICMP6_PARAM_PROB) 4436 state_icmp++; 4437 break; 4438#endif /* INET6 */ 4439 } 4440 4441 if (!state_icmp) { 4442 4443 /* 4444 * ICMP query/reply message not related to a TCP/UDP packet. 4445 * Search for an ICMP state. 4446 */ 4447 key.af = pd->af; 4448 key.proto = pd->proto; 4449 key.port[0] = key.port[1] = icmpid; 4450 if (direction == PF_IN) { /* wire side, straight */ 4451 PF_ACPY(&key.addr[0], pd->src, key.af); 4452 PF_ACPY(&key.addr[1], pd->dst, key.af); 4453 } else { /* stack side, reverse */ 4454 PF_ACPY(&key.addr[1], pd->src, key.af); 4455 PF_ACPY(&key.addr[0], pd->dst, key.af); 4456 } 4457 4458 STATE_LOOKUP(kif, &key, direction, *state, pd); 4459 4460 (*state)->expire = time_uptime; 4461 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4462 4463 /* translate source/destination address, if necessary */ 4464 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4465 struct pf_state_key *nk = (*state)->key[pd->didx]; 4466 4467 switch (pd->af) { 4468#ifdef INET 4469 case AF_INET: 4470 if (PF_ANEQ(pd->src, 4471 &nk->addr[pd->sidx], AF_INET)) 4472 pf_change_a(&saddr->v4.s_addr, 4473 pd->ip_sum, 4474 nk->addr[pd->sidx].v4.s_addr, 0); 4475 4476 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4477 AF_INET)) 4478 pf_change_a(&daddr->v4.s_addr, 4479 pd->ip_sum, 4480 nk->addr[pd->didx].v4.s_addr, 0); 4481 4482 if (nk->port[0] != 4483 pd->hdr.icmp->icmp_id) { 4484 pd->hdr.icmp->icmp_cksum = 4485 pf_cksum_fixup( 4486 pd->hdr.icmp->icmp_cksum, icmpid, 4487 nk->port[pd->sidx], 0); 4488 pd->hdr.icmp->icmp_id = 4489 nk->port[pd->sidx]; 4490 } 4491 4492 m_copyback(m, off, ICMP_MINLEN, 4493 (caddr_t )pd->hdr.icmp); 4494 break; 4495#endif /* INET */ 4496#ifdef INET6 4497 case AF_INET6: 4498 if (PF_ANEQ(pd->src, 4499 &nk->addr[pd->sidx], AF_INET6)) 4500 pf_change_a6(saddr, 4501 &pd->hdr.icmp6->icmp6_cksum, 4502 &nk->addr[pd->sidx], 0); 4503 4504 if (PF_ANEQ(pd->dst, 4505 &nk->addr[pd->didx], AF_INET6)) 4506 pf_change_a6(daddr, 4507 &pd->hdr.icmp6->icmp6_cksum, 4508 &nk->addr[pd->didx], 0); 4509 4510 m_copyback(m, off, sizeof(struct icmp6_hdr), 4511 (caddr_t )pd->hdr.icmp6); 4512 break; 4513#endif /* INET6 */ 4514 } 4515 } 4516 return (PF_PASS); 4517 4518 } else { 4519 /* 4520 * ICMP error message in response to a TCP/UDP packet. 4521 * Extract the inner TCP/UDP header and search for that state. 4522 */ 4523 4524 struct pf_pdesc pd2; 4525 bzero(&pd2, sizeof pd2); 4526#ifdef INET 4527 struct ip h2; 4528#endif /* INET */ 4529#ifdef INET6 4530 struct ip6_hdr h2_6; 4531 int terminal = 0; 4532#endif /* INET6 */ 4533 int ipoff2 = 0; 4534 int off2 = 0; 4535 4536 pd2.af = pd->af; 4537 /* Payload packet is from the opposite direction. */ 4538 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4539 pd2.didx = (direction == PF_IN) ? 0 : 1; 4540 switch (pd->af) { 4541#ifdef INET 4542 case AF_INET: 4543 /* offset of h2 in mbuf chain */ 4544 ipoff2 = off + ICMP_MINLEN; 4545 4546 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4547 NULL, reason, pd2.af)) { 4548 DPFPRINTF(PF_DEBUG_MISC, 4549 ("pf: ICMP error message too short " 4550 "(ip)\n")); 4551 return (PF_DROP); 4552 } 4553 /* 4554 * ICMP error messages don't refer to non-first 4555 * fragments 4556 */ 4557 if (h2.ip_off & htons(IP_OFFMASK)) { 4558 REASON_SET(reason, PFRES_FRAG); 4559 return (PF_DROP); 4560 } 4561 4562 /* offset of protocol header that follows h2 */ 4563 off2 = ipoff2 + (h2.ip_hl << 2); 4564 4565 pd2.proto = h2.ip_p; 4566 pd2.src = (struct pf_addr *)&h2.ip_src; 4567 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4568 pd2.ip_sum = &h2.ip_sum; 4569 break; 4570#endif /* INET */ 4571#ifdef INET6 4572 case AF_INET6: 4573 ipoff2 = off + sizeof(struct icmp6_hdr); 4574 4575 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4576 NULL, reason, pd2.af)) { 4577 DPFPRINTF(PF_DEBUG_MISC, 4578 ("pf: ICMP error message too short " 4579 "(ip6)\n")); 4580 return (PF_DROP); 4581 } 4582 pd2.proto = h2_6.ip6_nxt; 4583 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4584 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4585 pd2.ip_sum = NULL; 4586 off2 = ipoff2 + sizeof(h2_6); 4587 do { 4588 switch (pd2.proto) { 4589 case IPPROTO_FRAGMENT: 4590 /* 4591 * ICMPv6 error messages for 4592 * non-first fragments 4593 */ 4594 REASON_SET(reason, PFRES_FRAG); 4595 return (PF_DROP); 4596 case IPPROTO_AH: 4597 case IPPROTO_HOPOPTS: 4598 case IPPROTO_ROUTING: 4599 case IPPROTO_DSTOPTS: { 4600 /* get next header and header length */ 4601 struct ip6_ext opt6; 4602 4603 if (!pf_pull_hdr(m, off2, &opt6, 4604 sizeof(opt6), NULL, reason, 4605 pd2.af)) { 4606 DPFPRINTF(PF_DEBUG_MISC, 4607 ("pf: ICMPv6 short opt\n")); 4608 return (PF_DROP); 4609 } 4610 if (pd2.proto == IPPROTO_AH) 4611 off2 += (opt6.ip6e_len + 2) * 4; 4612 else 4613 off2 += (opt6.ip6e_len + 1) * 8; 4614 pd2.proto = opt6.ip6e_nxt; 4615 /* goto the next header */ 4616 break; 4617 } 4618 default: 4619 terminal++; 4620 break; 4621 } 4622 } while (!terminal); 4623 break; 4624#endif /* INET6 */ 4625 } 4626 4627 switch (pd2.proto) { 4628 case IPPROTO_TCP: { 4629 struct tcphdr th; 4630 u_int32_t seq; 4631 struct pf_state_peer *src, *dst; 4632 u_int8_t dws; 4633 int copyback = 0; 4634 4635 /* 4636 * Only the first 8 bytes of the TCP header can be 4637 * expected. Don't access any TCP header fields after 4638 * th_seq, an ackskew test is not possible. 4639 */ 4640 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4641 pd2.af)) { 4642 DPFPRINTF(PF_DEBUG_MISC, 4643 ("pf: ICMP error message too short " 4644 "(tcp)\n")); 4645 return (PF_DROP); 4646 } 4647 4648 key.af = pd2.af; 4649 key.proto = IPPROTO_TCP; 4650 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4651 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4652 key.port[pd2.sidx] = th.th_sport; 4653 key.port[pd2.didx] = th.th_dport; 4654 4655 STATE_LOOKUP(kif, &key, direction, *state, pd); 4656 4657 if (direction == (*state)->direction) { 4658 src = &(*state)->dst; 4659 dst = &(*state)->src; 4660 } else { 4661 src = &(*state)->src; 4662 dst = &(*state)->dst; 4663 } 4664 4665 if (src->wscale && dst->wscale) 4666 dws = dst->wscale & PF_WSCALE_MASK; 4667 else 4668 dws = 0; 4669 4670 /* Demodulate sequence number */ 4671 seq = ntohl(th.th_seq) - src->seqdiff; 4672 if (src->seqdiff) { 4673 pf_change_a(&th.th_seq, icmpsum, 4674 htonl(seq), 0); 4675 copyback = 1; 4676 } 4677 4678 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4679 (!SEQ_GEQ(src->seqhi, seq) || 4680 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4681 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4682 printf("pf: BAD ICMP %d:%d ", 4683 icmptype, pd->hdr.icmp->icmp_code); 4684 pf_print_host(pd->src, 0, pd->af); 4685 printf(" -> "); 4686 pf_print_host(pd->dst, 0, pd->af); 4687 printf(" state: "); 4688 pf_print_state(*state); 4689 printf(" seq=%u\n", seq); 4690 } 4691 REASON_SET(reason, PFRES_BADSTATE); 4692 return (PF_DROP); 4693 } else { 4694 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4695 printf("pf: OK ICMP %d:%d ", 4696 icmptype, pd->hdr.icmp->icmp_code); 4697 pf_print_host(pd->src, 0, pd->af); 4698 printf(" -> "); 4699 pf_print_host(pd->dst, 0, pd->af); 4700 printf(" state: "); 4701 pf_print_state(*state); 4702 printf(" seq=%u\n", seq); 4703 } 4704 } 4705 4706 /* translate source/destination address, if necessary */ 4707 if ((*state)->key[PF_SK_WIRE] != 4708 (*state)->key[PF_SK_STACK]) { 4709 struct pf_state_key *nk = 4710 (*state)->key[pd->didx]; 4711 4712 if (PF_ANEQ(pd2.src, 4713 &nk->addr[pd2.sidx], pd2.af) || 4714 nk->port[pd2.sidx] != th.th_sport) 4715 pf_change_icmp(pd2.src, &th.th_sport, 4716 daddr, &nk->addr[pd2.sidx], 4717 nk->port[pd2.sidx], NULL, 4718 pd2.ip_sum, icmpsum, 4719 pd->ip_sum, 0, pd2.af); 4720 4721 if (PF_ANEQ(pd2.dst, 4722 &nk->addr[pd2.didx], pd2.af) || 4723 nk->port[pd2.didx] != th.th_dport) 4724 pf_change_icmp(pd2.dst, &th.th_dport, 4725 NULL, /* XXX Inbound NAT? */ 4726 &nk->addr[pd2.didx], 4727 nk->port[pd2.didx], NULL, 4728 pd2.ip_sum, icmpsum, 4729 pd->ip_sum, 0, pd2.af); 4730 copyback = 1; 4731 } 4732 4733 if (copyback) { 4734 switch (pd2.af) { 4735#ifdef INET 4736 case AF_INET: 4737 m_copyback(m, off, ICMP_MINLEN, 4738 (caddr_t )pd->hdr.icmp); 4739 m_copyback(m, ipoff2, sizeof(h2), 4740 (caddr_t )&h2); 4741 break; 4742#endif /* INET */ 4743#ifdef INET6 4744 case AF_INET6: 4745 m_copyback(m, off, 4746 sizeof(struct icmp6_hdr), 4747 (caddr_t )pd->hdr.icmp6); 4748 m_copyback(m, ipoff2, sizeof(h2_6), 4749 (caddr_t )&h2_6); 4750 break; 4751#endif /* INET6 */ 4752 } 4753 m_copyback(m, off2, 8, (caddr_t)&th); 4754 } 4755 4756 return (PF_PASS); 4757 break; 4758 } 4759 case IPPROTO_UDP: { 4760 struct udphdr uh; 4761 4762 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4763 NULL, reason, pd2.af)) { 4764 DPFPRINTF(PF_DEBUG_MISC, 4765 ("pf: ICMP error message too short " 4766 "(udp)\n")); 4767 return (PF_DROP); 4768 } 4769 4770 key.af = pd2.af; 4771 key.proto = IPPROTO_UDP; 4772 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4773 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4774 key.port[pd2.sidx] = uh.uh_sport; 4775 key.port[pd2.didx] = uh.uh_dport; 4776 4777 STATE_LOOKUP(kif, &key, direction, *state, pd); 4778 4779 /* translate source/destination address, if necessary */ 4780 if ((*state)->key[PF_SK_WIRE] != 4781 (*state)->key[PF_SK_STACK]) { 4782 struct pf_state_key *nk = 4783 (*state)->key[pd->didx]; 4784 4785 if (PF_ANEQ(pd2.src, 4786 &nk->addr[pd2.sidx], pd2.af) || 4787 nk->port[pd2.sidx] != uh.uh_sport) 4788 pf_change_icmp(pd2.src, &uh.uh_sport, 4789 daddr, &nk->addr[pd2.sidx], 4790 nk->port[pd2.sidx], &uh.uh_sum, 4791 pd2.ip_sum, icmpsum, 4792 pd->ip_sum, 1, pd2.af); 4793 4794 if (PF_ANEQ(pd2.dst, 4795 &nk->addr[pd2.didx], pd2.af) || 4796 nk->port[pd2.didx] != uh.uh_dport) 4797 pf_change_icmp(pd2.dst, &uh.uh_dport, 4798 NULL, /* XXX Inbound NAT? */ 4799 &nk->addr[pd2.didx], 4800 nk->port[pd2.didx], &uh.uh_sum, 4801 pd2.ip_sum, icmpsum, 4802 pd->ip_sum, 1, pd2.af); 4803 4804 switch (pd2.af) { 4805#ifdef INET 4806 case AF_INET: 4807 m_copyback(m, off, ICMP_MINLEN, 4808 (caddr_t )pd->hdr.icmp); 4809 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4810 break; 4811#endif /* INET */ 4812#ifdef INET6 4813 case AF_INET6: 4814 m_copyback(m, off, 4815 sizeof(struct icmp6_hdr), 4816 (caddr_t )pd->hdr.icmp6); 4817 m_copyback(m, ipoff2, sizeof(h2_6), 4818 (caddr_t )&h2_6); 4819 break; 4820#endif /* INET6 */ 4821 } 4822 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4823 } 4824 return (PF_PASS); 4825 break; 4826 } 4827#ifdef INET 4828 case IPPROTO_ICMP: { 4829 struct icmp iih; 4830 4831 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4832 NULL, reason, pd2.af)) { 4833 DPFPRINTF(PF_DEBUG_MISC, 4834 ("pf: ICMP error message too short i" 4835 "(icmp)\n")); 4836 return (PF_DROP); 4837 } 4838 4839 key.af = pd2.af; 4840 key.proto = IPPROTO_ICMP; 4841 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4842 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4843 key.port[0] = key.port[1] = iih.icmp_id; 4844 4845 STATE_LOOKUP(kif, &key, direction, *state, pd); 4846 4847 /* translate source/destination address, if necessary */ 4848 if ((*state)->key[PF_SK_WIRE] != 4849 (*state)->key[PF_SK_STACK]) { 4850 struct pf_state_key *nk = 4851 (*state)->key[pd->didx]; 4852 4853 if (PF_ANEQ(pd2.src, 4854 &nk->addr[pd2.sidx], pd2.af) || 4855 nk->port[pd2.sidx] != iih.icmp_id) 4856 pf_change_icmp(pd2.src, &iih.icmp_id, 4857 daddr, &nk->addr[pd2.sidx], 4858 nk->port[pd2.sidx], NULL, 4859 pd2.ip_sum, icmpsum, 4860 pd->ip_sum, 0, AF_INET); 4861 4862 if (PF_ANEQ(pd2.dst, 4863 &nk->addr[pd2.didx], pd2.af) || 4864 nk->port[pd2.didx] != iih.icmp_id) 4865 pf_change_icmp(pd2.dst, &iih.icmp_id, 4866 NULL, /* XXX Inbound NAT? */ 4867 &nk->addr[pd2.didx], 4868 nk->port[pd2.didx], NULL, 4869 pd2.ip_sum, icmpsum, 4870 pd->ip_sum, 0, AF_INET); 4871 4872 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4873 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4874 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4875 } 4876 return (PF_PASS); 4877 break; 4878 } 4879#endif /* INET */ 4880#ifdef INET6 4881 case IPPROTO_ICMPV6: { 4882 struct icmp6_hdr iih; 4883 4884 if (!pf_pull_hdr(m, off2, &iih, 4885 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4886 DPFPRINTF(PF_DEBUG_MISC, 4887 ("pf: ICMP error message too short " 4888 "(icmp6)\n")); 4889 return (PF_DROP); 4890 } 4891 4892 key.af = pd2.af; 4893 key.proto = IPPROTO_ICMPV6; 4894 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4895 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4896 key.port[0] = key.port[1] = iih.icmp6_id; 4897 4898 STATE_LOOKUP(kif, &key, direction, *state, pd); 4899 4900 /* translate source/destination address, if necessary */ 4901 if ((*state)->key[PF_SK_WIRE] != 4902 (*state)->key[PF_SK_STACK]) { 4903 struct pf_state_key *nk = 4904 (*state)->key[pd->didx]; 4905 4906 if (PF_ANEQ(pd2.src, 4907 &nk->addr[pd2.sidx], pd2.af) || 4908 nk->port[pd2.sidx] != iih.icmp6_id) 4909 pf_change_icmp(pd2.src, &iih.icmp6_id, 4910 daddr, &nk->addr[pd2.sidx], 4911 nk->port[pd2.sidx], NULL, 4912 pd2.ip_sum, icmpsum, 4913 pd->ip_sum, 0, AF_INET6); 4914 4915 if (PF_ANEQ(pd2.dst, 4916 &nk->addr[pd2.didx], pd2.af) || 4917 nk->port[pd2.didx] != iih.icmp6_id) 4918 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4919 NULL, /* XXX Inbound NAT? */ 4920 &nk->addr[pd2.didx], 4921 nk->port[pd2.didx], NULL, 4922 pd2.ip_sum, icmpsum, 4923 pd->ip_sum, 0, AF_INET6); 4924 4925 m_copyback(m, off, sizeof(struct icmp6_hdr), 4926 (caddr_t)pd->hdr.icmp6); 4927 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4928 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4929 (caddr_t)&iih); 4930 } 4931 return (PF_PASS); 4932 break; 4933 } 4934#endif /* INET6 */ 4935 default: { 4936 key.af = pd2.af; 4937 key.proto = pd2.proto; 4938 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4939 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4940 key.port[0] = key.port[1] = 0; 4941 4942 STATE_LOOKUP(kif, &key, direction, *state, pd); 4943 4944 /* translate source/destination address, if necessary */ 4945 if ((*state)->key[PF_SK_WIRE] != 4946 (*state)->key[PF_SK_STACK]) { 4947 struct pf_state_key *nk = 4948 (*state)->key[pd->didx]; 4949 4950 if (PF_ANEQ(pd2.src, 4951 &nk->addr[pd2.sidx], pd2.af)) 4952 pf_change_icmp(pd2.src, NULL, daddr, 4953 &nk->addr[pd2.sidx], 0, NULL, 4954 pd2.ip_sum, icmpsum, 4955 pd->ip_sum, 0, pd2.af); 4956 4957 if (PF_ANEQ(pd2.dst, 4958 &nk->addr[pd2.didx], pd2.af)) 4959 pf_change_icmp(pd2.src, NULL, 4960 NULL, /* XXX Inbound NAT? */ 4961 &nk->addr[pd2.didx], 0, NULL, 4962 pd2.ip_sum, icmpsum, 4963 pd->ip_sum, 0, pd2.af); 4964 4965 switch (pd2.af) { 4966#ifdef INET 4967 case AF_INET: 4968 m_copyback(m, off, ICMP_MINLEN, 4969 (caddr_t)pd->hdr.icmp); 4970 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4971 break; 4972#endif /* INET */ 4973#ifdef INET6 4974 case AF_INET6: 4975 m_copyback(m, off, 4976 sizeof(struct icmp6_hdr), 4977 (caddr_t )pd->hdr.icmp6); 4978 m_copyback(m, ipoff2, sizeof(h2_6), 4979 (caddr_t )&h2_6); 4980 break; 4981#endif /* INET6 */ 4982 } 4983 } 4984 return (PF_PASS); 4985 break; 4986 } 4987 } 4988 } 4989} 4990 4991static int 4992pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 4993 struct mbuf *m, struct pf_pdesc *pd) 4994{ 4995 struct pf_state_peer *src, *dst; 4996 struct pf_state_key_cmp key; 4997 4998 bzero(&key, sizeof(key)); 4999 key.af = pd->af; 5000 key.proto = pd->proto; 5001 if (direction == PF_IN) { 5002 PF_ACPY(&key.addr[0], pd->src, key.af); 5003 PF_ACPY(&key.addr[1], pd->dst, key.af); 5004 key.port[0] = key.port[1] = 0; 5005 } else { 5006 PF_ACPY(&key.addr[1], pd->src, key.af); 5007 PF_ACPY(&key.addr[0], pd->dst, key.af); 5008 key.port[1] = key.port[0] = 0; 5009 } 5010 5011 STATE_LOOKUP(kif, &key, direction, *state, pd); 5012 5013 if (direction == (*state)->direction) { 5014 src = &(*state)->src; 5015 dst = &(*state)->dst; 5016 } else { 5017 src = &(*state)->dst; 5018 dst = &(*state)->src; 5019 } 5020 5021 /* update states */ 5022 if (src->state < PFOTHERS_SINGLE) 5023 src->state = PFOTHERS_SINGLE; 5024 if (dst->state == PFOTHERS_SINGLE) 5025 dst->state = PFOTHERS_MULTIPLE; 5026 5027 /* update expire time */ 5028 (*state)->expire = time_uptime; 5029 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5030 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5031 else 5032 (*state)->timeout = PFTM_OTHER_SINGLE; 5033 5034 /* translate source/destination address, if necessary */ 5035 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5036 struct pf_state_key *nk = (*state)->key[pd->didx]; 5037 5038 KASSERT(nk, ("%s: nk is null", __func__)); 5039 KASSERT(pd, ("%s: pd is null", __func__)); 5040 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5041 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5042 switch (pd->af) { 5043#ifdef INET 5044 case AF_INET: 5045 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5046 pf_change_a(&pd->src->v4.s_addr, 5047 pd->ip_sum, 5048 nk->addr[pd->sidx].v4.s_addr, 5049 0); 5050 5051 5052 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5053 pf_change_a(&pd->dst->v4.s_addr, 5054 pd->ip_sum, 5055 nk->addr[pd->didx].v4.s_addr, 5056 0); 5057 5058 break; 5059#endif /* INET */ 5060#ifdef INET6 5061 case AF_INET6: 5062 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5063 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5064 5065 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5066 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5067#endif /* INET6 */ 5068 } 5069 } 5070 return (PF_PASS); 5071} 5072 5073/* 5074 * ipoff and off are measured from the start of the mbuf chain. 5075 * h must be at "ipoff" on the mbuf chain. 5076 */ 5077void * 5078pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5079 u_short *actionp, u_short *reasonp, sa_family_t af) 5080{ 5081 switch (af) { 5082#ifdef INET 5083 case AF_INET: { 5084 struct ip *h = mtod(m, struct ip *); 5085 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5086 5087 if (fragoff) { 5088 if (fragoff >= len) 5089 ACTION_SET(actionp, PF_PASS); 5090 else { 5091 ACTION_SET(actionp, PF_DROP); 5092 REASON_SET(reasonp, PFRES_FRAG); 5093 } 5094 return (NULL); 5095 } 5096 if (m->m_pkthdr.len < off + len || 5097 ntohs(h->ip_len) < off + len) { 5098 ACTION_SET(actionp, PF_DROP); 5099 REASON_SET(reasonp, PFRES_SHORT); 5100 return (NULL); 5101 } 5102 break; 5103 } 5104#endif /* INET */ 5105#ifdef INET6 5106 case AF_INET6: { 5107 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5108 5109 if (m->m_pkthdr.len < off + len || 5110 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5111 (unsigned)(off + len)) { 5112 ACTION_SET(actionp, PF_DROP); 5113 REASON_SET(reasonp, PFRES_SHORT); 5114 return (NULL); 5115 } 5116 break; 5117 } 5118#endif /* INET6 */ 5119 } 5120 m_copydata(m, off, len, p); 5121 return (p); 5122} 5123 5124int 5125pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5126 int rtableid) 5127{ 5128#ifdef RADIX_MPATH 5129 struct radix_node_head *rnh; 5130#endif 5131 struct sockaddr_in *dst; 5132 int ret = 1; 5133 int check_mpath; 5134#ifdef INET6 5135 struct sockaddr_in6 *dst6; 5136 struct route_in6 ro; 5137#else 5138 struct route ro; 5139#endif 5140 struct radix_node *rn; 5141 struct rtentry *rt; 5142 struct ifnet *ifp; 5143 5144 check_mpath = 0; 5145#ifdef RADIX_MPATH 5146 /* XXX: stick to table 0 for now */ 5147 rnh = rt_tables_get_rnh(0, af); 5148 if (rnh != NULL && rn_mpath_capable(rnh)) 5149 check_mpath = 1; 5150#endif 5151 bzero(&ro, sizeof(ro)); 5152 switch (af) { 5153 case AF_INET: 5154 dst = satosin(&ro.ro_dst); 5155 dst->sin_family = AF_INET; 5156 dst->sin_len = sizeof(*dst); 5157 dst->sin_addr = addr->v4; 5158 break; 5159#ifdef INET6 5160 case AF_INET6: 5161 /* 5162 * Skip check for addresses with embedded interface scope, 5163 * as they would always match anyway. 5164 */ 5165 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5166 goto out; 5167 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5168 dst6->sin6_family = AF_INET6; 5169 dst6->sin6_len = sizeof(*dst6); 5170 dst6->sin6_addr = addr->v6; 5171 break; 5172#endif /* INET6 */ 5173 default: 5174 return (0); 5175 } 5176 5177 /* Skip checks for ipsec interfaces */ 5178 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5179 goto out; 5180 5181 switch (af) { 5182#ifdef INET6 5183 case AF_INET6: 5184 in6_rtalloc_ign(&ro, 0, rtableid); 5185 break; 5186#endif 5187#ifdef INET 5188 case AF_INET: 5189 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5190 break; 5191#endif 5192 default: 5193 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5194 break; 5195 } 5196 5197 if (ro.ro_rt != NULL) { 5198 /* No interface given, this is a no-route check */ 5199 if (kif == NULL) 5200 goto out; 5201 5202 if (kif->pfik_ifp == NULL) { 5203 ret = 0; 5204 goto out; 5205 } 5206 5207 /* Perform uRPF check if passed input interface */ 5208 ret = 0; 5209 rn = (struct radix_node *)ro.ro_rt; 5210 do { 5211 rt = (struct rtentry *)rn; 5212 ifp = rt->rt_ifp; 5213 5214 if (kif->pfik_ifp == ifp) 5215 ret = 1; 5216#ifdef RADIX_MPATH 5217 rn = rn_mpath_next(rn); 5218#endif 5219 } while (check_mpath == 1 && rn != NULL && ret == 0); 5220 } else 5221 ret = 0; 5222out: 5223 if (ro.ro_rt != NULL) 5224 RTFREE(ro.ro_rt); 5225 return (ret); 5226} 5227 5228#ifdef INET 5229static void 5230pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5231 struct pf_state *s, struct pf_pdesc *pd) 5232{ 5233 struct mbuf *m0, *m1; 5234 struct sockaddr_in dst; 5235 struct ip *ip; 5236 struct ifnet *ifp = NULL; 5237 struct pf_addr naddr; 5238 struct pf_src_node *sn = NULL; 5239 int error = 0; 5240 uint16_t ip_len, ip_off; 5241 5242 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5243 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5244 __func__)); 5245 5246 if ((pd->pf_mtag == NULL && 5247 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5248 pd->pf_mtag->routed++ > 3) { 5249 m0 = *m; 5250 *m = NULL; 5251 goto bad_locked; 5252 } 5253 5254 if (r->rt == PF_DUPTO) { 5255 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5256 if (s) 5257 PF_STATE_UNLOCK(s); 5258 return; 5259 } 5260 } else { 5261 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5262 if (s) 5263 PF_STATE_UNLOCK(s); 5264 return; 5265 } 5266 m0 = *m; 5267 } 5268 5269 ip = mtod(m0, struct ip *); 5270 5271 bzero(&dst, sizeof(dst)); 5272 dst.sin_family = AF_INET; 5273 dst.sin_len = sizeof(dst); 5274 dst.sin_addr = ip->ip_dst; 5275 5276 if (r->rt == PF_FASTROUTE) { 5277 struct rtentry *rt; 5278 5279 if (s) 5280 PF_STATE_UNLOCK(s); 5281 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5282 if (rt == NULL) { 5283 KMOD_IPSTAT_INC(ips_noroute); 5284 error = EHOSTUNREACH; 5285 goto bad; 5286 } 5287 5288 ifp = rt->rt_ifp; 5289 counter_u64_add(rt->rt_pksent, 1); 5290 5291 if (rt->rt_flags & RTF_GATEWAY) 5292 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5293 RTFREE_LOCKED(rt); 5294 } else { 5295 if (TAILQ_EMPTY(&r->rpool.list)) { 5296 DPFPRINTF(PF_DEBUG_URGENT, 5297 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5298 goto bad_locked; 5299 } 5300 if (s == NULL) { 5301 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5302 &naddr, NULL, &sn); 5303 if (!PF_AZERO(&naddr, AF_INET)) 5304 dst.sin_addr.s_addr = naddr.v4.s_addr; 5305 ifp = r->rpool.cur->kif ? 5306 r->rpool.cur->kif->pfik_ifp : NULL; 5307 } else { 5308 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5309 dst.sin_addr.s_addr = 5310 s->rt_addr.v4.s_addr; 5311 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5312 PF_STATE_UNLOCK(s); 5313 } 5314 } 5315 if (ifp == NULL) 5316 goto bad; 5317 5318 if (oifp != ifp) { 5319 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5320 goto bad; 5321 else if (m0 == NULL) 5322 goto done; 5323 if (m0->m_len < sizeof(struct ip)) { 5324 DPFPRINTF(PF_DEBUG_URGENT, 5325 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5326 goto bad; 5327 } 5328 ip = mtod(m0, struct ip *); 5329 } 5330 5331 if (ifp->if_flags & IFF_LOOPBACK) 5332 m0->m_flags |= M_SKIP_FIREWALL; 5333 5334 ip_len = ntohs(ip->ip_len); 5335 ip_off = ntohs(ip->ip_off); 5336 5337 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5338 m0->m_pkthdr.csum_flags |= CSUM_IP; 5339 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5340 in_delayed_cksum(m0); 5341 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5342 } 5343#ifdef SCTP 5344 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 5345 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5346 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 5347 } 5348#endif 5349 5350 /* 5351 * If small enough for interface, or the interface will take 5352 * care of the fragmentation for us, we can just send directly. 5353 */ 5354 if (ip_len <= ifp->if_mtu || 5355 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5356 ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5357 ip->ip_sum = 0; 5358 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 5359 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5360 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 5361 } 5362 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 5363 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5364 goto done; 5365 } 5366 5367 /* Balk when DF bit is set or the interface didn't support TSO. */ 5368 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5369 error = EMSGSIZE; 5370 KMOD_IPSTAT_INC(ips_cantfrag); 5371 if (r->rt != PF_DUPTO) { 5372 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5373 ifp->if_mtu); 5374 goto done; 5375 } else 5376 goto bad; 5377 } 5378 5379 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 5380 if (error) 5381 goto bad; 5382 5383 for (; m0; m0 = m1) { 5384 m1 = m0->m_nextpkt; 5385 m0->m_nextpkt = NULL; 5386 if (error == 0) { 5387 m_clrprotoflags(m0); 5388 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5389 } else 5390 m_freem(m0); 5391 } 5392 5393 if (error == 0) 5394 KMOD_IPSTAT_INC(ips_fragmented); 5395 5396done: 5397 if (r->rt != PF_DUPTO) 5398 *m = NULL; 5399 return; 5400 5401bad_locked: 5402 if (s) 5403 PF_STATE_UNLOCK(s); 5404bad: 5405 m_freem(m0); 5406 goto done; 5407} 5408#endif /* INET */ 5409 5410#ifdef INET6 5411static void 5412pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5413 struct pf_state *s, struct pf_pdesc *pd) 5414{ 5415 struct mbuf *m0; 5416 struct sockaddr_in6 dst; 5417 struct ip6_hdr *ip6; 5418 struct ifnet *ifp = NULL; 5419 struct pf_addr naddr; 5420 struct pf_src_node *sn = NULL; 5421 5422 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5423 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5424 __func__)); 5425 5426 if ((pd->pf_mtag == NULL && 5427 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5428 pd->pf_mtag->routed++ > 3) { 5429 m0 = *m; 5430 *m = NULL; 5431 goto bad_locked; 5432 } 5433 5434 if (r->rt == PF_DUPTO) { 5435 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5436 if (s) 5437 PF_STATE_UNLOCK(s); 5438 return; 5439 } 5440 } else { 5441 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5442 if (s) 5443 PF_STATE_UNLOCK(s); 5444 return; 5445 } 5446 m0 = *m; 5447 } 5448 5449 ip6 = mtod(m0, struct ip6_hdr *); 5450 5451 bzero(&dst, sizeof(dst)); 5452 dst.sin6_family = AF_INET6; 5453 dst.sin6_len = sizeof(dst); 5454 dst.sin6_addr = ip6->ip6_dst; 5455 5456 /* Cheat. XXX why only in the v6 case??? */ 5457 if (r->rt == PF_FASTROUTE) { 5458 if (s) 5459 PF_STATE_UNLOCK(s); 5460 m0->m_flags |= M_SKIP_FIREWALL; 5461 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5462 return; 5463 } 5464 5465 if (TAILQ_EMPTY(&r->rpool.list)) { 5466 DPFPRINTF(PF_DEBUG_URGENT, 5467 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5468 goto bad_locked; 5469 } 5470 if (s == NULL) { 5471 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5472 &naddr, NULL, &sn); 5473 if (!PF_AZERO(&naddr, AF_INET6)) 5474 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5475 &naddr, AF_INET6); 5476 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5477 } else { 5478 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5479 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5480 &s->rt_addr, AF_INET6); 5481 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5482 } 5483 5484 if (s) 5485 PF_STATE_UNLOCK(s); 5486 5487 if (ifp == NULL) 5488 goto bad; 5489 5490 if (oifp != ifp) { 5491 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5492 goto bad; 5493 else if (m0 == NULL) 5494 goto done; 5495 if (m0->m_len < sizeof(struct ip6_hdr)) { 5496 DPFPRINTF(PF_DEBUG_URGENT, 5497 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5498 __func__)); 5499 goto bad; 5500 } 5501 ip6 = mtod(m0, struct ip6_hdr *); 5502 } 5503 5504 if (ifp->if_flags & IFF_LOOPBACK) 5505 m0->m_flags |= M_SKIP_FIREWALL; 5506 5507 /* 5508 * If the packet is too large for the outgoing interface, 5509 * send back an icmp6 error. 5510 */ 5511 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5512 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5513 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5514 nd6_output(ifp, ifp, m0, &dst, NULL); 5515 else { 5516 in6_ifstat_inc(ifp, ifs6_in_toobig); 5517 if (r->rt != PF_DUPTO) 5518 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5519 else 5520 goto bad; 5521 } 5522 5523done: 5524 if (r->rt != PF_DUPTO) 5525 *m = NULL; 5526 return; 5527 5528bad_locked: 5529 if (s) 5530 PF_STATE_UNLOCK(s); 5531bad: 5532 m_freem(m0); 5533 goto done; 5534} 5535#endif /* INET6 */ 5536 5537/* 5538 * FreeBSD supports cksum offloads for the following drivers. 5539 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5540 * ti(4), txp(4), xl(4) 5541 * 5542 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5543 * network driver performed cksum including pseudo header, need to verify 5544 * csum_data 5545 * CSUM_DATA_VALID : 5546 * network driver performed cksum, needs to additional pseudo header 5547 * cksum computation with partial csum_data(i.e. lack of H/W support for 5548 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5549 * 5550 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5551 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5552 * TCP/UDP layer. 5553 * Also, set csum_data to 0xffff to force cksum validation. 5554 */ 5555static int 5556pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5557{ 5558 u_int16_t sum = 0; 5559 int hw_assist = 0; 5560 struct ip *ip; 5561 5562 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5563 return (1); 5564 if (m->m_pkthdr.len < off + len) 5565 return (1); 5566 5567 switch (p) { 5568 case IPPROTO_TCP: 5569 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5570 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5571 sum = m->m_pkthdr.csum_data; 5572 } else { 5573 ip = mtod(m, struct ip *); 5574 sum = in_pseudo(ip->ip_src.s_addr, 5575 ip->ip_dst.s_addr, htonl((u_short)len + 5576 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5577 } 5578 sum ^= 0xffff; 5579 ++hw_assist; 5580 } 5581 break; 5582 case IPPROTO_UDP: 5583 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5584 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5585 sum = m->m_pkthdr.csum_data; 5586 } else { 5587 ip = mtod(m, struct ip *); 5588 sum = in_pseudo(ip->ip_src.s_addr, 5589 ip->ip_dst.s_addr, htonl((u_short)len + 5590 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5591 } 5592 sum ^= 0xffff; 5593 ++hw_assist; 5594 } 5595 break; 5596 case IPPROTO_ICMP: 5597#ifdef INET6 5598 case IPPROTO_ICMPV6: 5599#endif /* INET6 */ 5600 break; 5601 default: 5602 return (1); 5603 } 5604 5605 if (!hw_assist) { 5606 switch (af) { 5607 case AF_INET: 5608 if (p == IPPROTO_ICMP) { 5609 if (m->m_len < off) 5610 return (1); 5611 m->m_data += off; 5612 m->m_len -= off; 5613 sum = in_cksum(m, len); 5614 m->m_data -= off; 5615 m->m_len += off; 5616 } else { 5617 if (m->m_len < sizeof(struct ip)) 5618 return (1); 5619 sum = in4_cksum(m, p, off, len); 5620 } 5621 break; 5622#ifdef INET6 5623 case AF_INET6: 5624 if (m->m_len < sizeof(struct ip6_hdr)) 5625 return (1); 5626 sum = in6_cksum(m, p, off, len); 5627 break; 5628#endif /* INET6 */ 5629 default: 5630 return (1); 5631 } 5632 } 5633 if (sum) { 5634 switch (p) { 5635 case IPPROTO_TCP: 5636 { 5637 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5638 break; 5639 } 5640 case IPPROTO_UDP: 5641 { 5642 KMOD_UDPSTAT_INC(udps_badsum); 5643 break; 5644 } 5645#ifdef INET 5646 case IPPROTO_ICMP: 5647 { 5648 KMOD_ICMPSTAT_INC(icps_checksum); 5649 break; 5650 } 5651#endif 5652#ifdef INET6 5653 case IPPROTO_ICMPV6: 5654 { 5655 KMOD_ICMP6STAT_INC(icp6s_checksum); 5656 break; 5657 } 5658#endif /* INET6 */ 5659 } 5660 return (1); 5661 } else { 5662 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5663 m->m_pkthdr.csum_flags |= 5664 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5665 m->m_pkthdr.csum_data = 0xffff; 5666 } 5667 } 5668 return (0); 5669} 5670 5671 5672#ifdef INET 5673int 5674pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5675{ 5676 struct pfi_kif *kif; 5677 u_short action, reason = 0, log = 0; 5678 struct mbuf *m = *m0; 5679 struct ip *h = NULL; 5680 struct m_tag *ipfwtag; 5681 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5682 struct pf_state *s = NULL; 5683 struct pf_ruleset *ruleset = NULL; 5684 struct pf_pdesc pd; 5685 int off, dirndx, pqid = 0; 5686 5687 M_ASSERTPKTHDR(m); 5688 5689 if (!V_pf_status.running) 5690 return (PF_PASS); 5691 5692 memset(&pd, 0, sizeof(pd)); 5693 5694 kif = (struct pfi_kif *)ifp->if_pf_kif; 5695 5696 if (kif == NULL) { 5697 DPFPRINTF(PF_DEBUG_URGENT, 5698 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5699 return (PF_DROP); 5700 } 5701 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5702 return (PF_PASS); 5703 5704 if (m->m_flags & M_SKIP_FIREWALL) 5705 return (PF_PASS); 5706 5707 pd.pf_mtag = pf_find_mtag(m); 5708 5709 PF_RULES_RLOCK(); 5710 5711 if (ip_divert_ptr != NULL && 5712 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5713 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5714 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5715 if (pd.pf_mtag == NULL && 5716 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5717 action = PF_DROP; 5718 goto done; 5719 } 5720 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5721 m_tag_delete(m, ipfwtag); 5722 } 5723 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5724 m->m_flags |= M_FASTFWD_OURS; 5725 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5726 } 5727 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5728 /* We do IP header normalization and packet reassembly here */ 5729 action = PF_DROP; 5730 goto done; 5731 } 5732 m = *m0; /* pf_normalize messes with m0 */ 5733 h = mtod(m, struct ip *); 5734 5735 off = h->ip_hl << 2; 5736 if (off < (int)sizeof(struct ip)) { 5737 action = PF_DROP; 5738 REASON_SET(&reason, PFRES_SHORT); 5739 log = 1; 5740 goto done; 5741 } 5742 5743 pd.src = (struct pf_addr *)&h->ip_src; 5744 pd.dst = (struct pf_addr *)&h->ip_dst; 5745 pd.sport = pd.dport = NULL; 5746 pd.ip_sum = &h->ip_sum; 5747 pd.proto_sum = NULL; 5748 pd.proto = h->ip_p; 5749 pd.dir = dir; 5750 pd.sidx = (dir == PF_IN) ? 0 : 1; 5751 pd.didx = (dir == PF_IN) ? 1 : 0; 5752 pd.af = AF_INET; 5753 pd.tos = h->ip_tos; 5754 pd.tot_len = ntohs(h->ip_len); 5755 5756 /* handle fragments that didn't get reassembled by normalization */ 5757 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5758 action = pf_test_fragment(&r, dir, kif, m, h, 5759 &pd, &a, &ruleset); 5760 goto done; 5761 } 5762 5763 switch (h->ip_p) { 5764 5765 case IPPROTO_TCP: { 5766 struct tcphdr th; 5767 5768 pd.hdr.tcp = &th; 5769 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5770 &action, &reason, AF_INET)) { 5771 log = action != PF_PASS; 5772 goto done; 5773 } 5774 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5775 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5776 pqid = 1; 5777 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5778 if (action == PF_DROP) 5779 goto done; 5780 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5781 &reason); 5782 if (action == PF_PASS) { 5783 if (pfsync_update_state_ptr != NULL) 5784 pfsync_update_state_ptr(s); 5785 r = s->rule.ptr; 5786 a = s->anchor.ptr; 5787 log = s->log; 5788 } else if (s == NULL) 5789 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5790 &a, &ruleset, inp); 5791 break; 5792 } 5793 5794 case IPPROTO_UDP: { 5795 struct udphdr uh; 5796 5797 pd.hdr.udp = &uh; 5798 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5799 &action, &reason, AF_INET)) { 5800 log = action != PF_PASS; 5801 goto done; 5802 } 5803 if (uh.uh_dport == 0 || 5804 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5805 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5806 action = PF_DROP; 5807 REASON_SET(&reason, PFRES_SHORT); 5808 goto done; 5809 } 5810 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5811 if (action == PF_PASS) { 5812 if (pfsync_update_state_ptr != NULL) 5813 pfsync_update_state_ptr(s); 5814 r = s->rule.ptr; 5815 a = s->anchor.ptr; 5816 log = s->log; 5817 } else if (s == NULL) 5818 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5819 &a, &ruleset, inp); 5820 break; 5821 } 5822 5823 case IPPROTO_ICMP: { 5824 struct icmp ih; 5825 5826 pd.hdr.icmp = &ih; 5827 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5828 &action, &reason, AF_INET)) { 5829 log = action != PF_PASS; 5830 goto done; 5831 } 5832 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5833 &reason); 5834 if (action == PF_PASS) { 5835 if (pfsync_update_state_ptr != NULL) 5836 pfsync_update_state_ptr(s); 5837 r = s->rule.ptr; 5838 a = s->anchor.ptr; 5839 log = s->log; 5840 } else if (s == NULL) 5841 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5842 &a, &ruleset, inp); 5843 break; 5844 } 5845 5846#ifdef INET6 5847 case IPPROTO_ICMPV6: { 5848 action = PF_DROP; 5849 DPFPRINTF(PF_DEBUG_MISC, 5850 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5851 goto done; 5852 } 5853#endif 5854 5855 default: 5856 action = pf_test_state_other(&s, dir, kif, m, &pd); 5857 if (action == PF_PASS) { 5858 if (pfsync_update_state_ptr != NULL) 5859 pfsync_update_state_ptr(s); 5860 r = s->rule.ptr; 5861 a = s->anchor.ptr; 5862 log = s->log; 5863 } else if (s == NULL) 5864 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5865 &a, &ruleset, inp); 5866 break; 5867 } 5868 5869done: 5870 PF_RULES_RUNLOCK(); 5871 if (action == PF_PASS && h->ip_hl > 5 && 5872 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 5873 action = PF_DROP; 5874 REASON_SET(&reason, PFRES_IPOPTIONS); 5875 log = 1; 5876 DPFPRINTF(PF_DEBUG_MISC, 5877 ("pf: dropping packet with ip options\n")); 5878 } 5879 5880 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 5881 action = PF_DROP; 5882 REASON_SET(&reason, PFRES_MEMORY); 5883 } 5884 if (r->rtableid >= 0) 5885 M_SETFIB(m, r->rtableid); 5886 5887#ifdef ALTQ 5888 if (action == PF_PASS && r->qid) { 5889 if (pd.pf_mtag == NULL && 5890 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5891 action = PF_DROP; 5892 REASON_SET(&reason, PFRES_MEMORY); 5893 } 5894 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5895 pd.pf_mtag->qid = r->pqid; 5896 else 5897 pd.pf_mtag->qid = r->qid; 5898 /* add hints for ecn */ 5899 pd.pf_mtag->hdr = h; 5900 5901 } 5902#endif /* ALTQ */ 5903 5904 /* 5905 * connections redirected to loopback should not match sockets 5906 * bound specifically to loopback due to security implications, 5907 * see tcp_input() and in_pcblookup_listen(). 5908 */ 5909 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5910 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5911 (s->nat_rule.ptr->action == PF_RDR || 5912 s->nat_rule.ptr->action == PF_BINAT) && 5913 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5914 m->m_flags |= M_SKIP_FIREWALL; 5915 5916 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 5917 !PACKET_LOOPED(&pd)) { 5918 5919 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 5920 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 5921 if (ipfwtag != NULL) { 5922 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 5923 ntohs(r->divert.port); 5924 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 5925 5926 if (s) 5927 PF_STATE_UNLOCK(s); 5928 5929 m_tag_prepend(m, ipfwtag); 5930 if (m->m_flags & M_FASTFWD_OURS) { 5931 if (pd.pf_mtag == NULL && 5932 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5933 action = PF_DROP; 5934 REASON_SET(&reason, PFRES_MEMORY); 5935 log = 1; 5936 DPFPRINTF(PF_DEBUG_MISC, 5937 ("pf: failed to allocate tag\n")); 5938 } 5939 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; 5940 m->m_flags &= ~M_FASTFWD_OURS; 5941 } 5942 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 5943 *m0 = NULL; 5944 5945 return (action); 5946 } else { 5947 /* XXX: ipfw has the same behaviour! */ 5948 action = PF_DROP; 5949 REASON_SET(&reason, PFRES_MEMORY); 5950 log = 1; 5951 DPFPRINTF(PF_DEBUG_MISC, 5952 ("pf: failed to allocate divert tag\n")); 5953 } 5954 } 5955 5956 if (log) { 5957 struct pf_rule *lr; 5958 5959 if (s != NULL && s->nat_rule.ptr != NULL && 5960 s->nat_rule.ptr->log & PF_LOG_ALL) 5961 lr = s->nat_rule.ptr; 5962 else 5963 lr = r; 5964 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 5965 (s == NULL)); 5966 } 5967 5968 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5969 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5970 5971 if (action == PF_PASS || r->action == PF_DROP) { 5972 dirndx = (dir == PF_OUT); 5973 r->packets[dirndx]++; 5974 r->bytes[dirndx] += pd.tot_len; 5975 if (a != NULL) { 5976 a->packets[dirndx]++; 5977 a->bytes[dirndx] += pd.tot_len; 5978 } 5979 if (s != NULL) { 5980 if (s->nat_rule.ptr != NULL) { 5981 s->nat_rule.ptr->packets[dirndx]++; 5982 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 5983 } 5984 if (s->src_node != NULL) { 5985 s->src_node->packets[dirndx]++; 5986 s->src_node->bytes[dirndx] += pd.tot_len; 5987 } 5988 if (s->nat_src_node != NULL) { 5989 s->nat_src_node->packets[dirndx]++; 5990 s->nat_src_node->bytes[dirndx] += pd.tot_len; 5991 } 5992 dirndx = (dir == s->direction) ? 0 : 1; 5993 s->packets[dirndx]++; 5994 s->bytes[dirndx] += pd.tot_len; 5995 } 5996 tr = r; 5997 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 5998 if (nr != NULL && r == &V_pf_default_rule) 5999 tr = nr; 6000 if (tr->src.addr.type == PF_ADDR_TABLE) 6001 pfr_update_stats(tr->src.addr.p.tbl, 6002 (s == NULL) ? pd.src : 6003 &s->key[(s->direction == PF_IN)]-> 6004 addr[(s->direction == PF_OUT)], 6005 pd.af, pd.tot_len, dir == PF_OUT, 6006 r->action == PF_PASS, tr->src.neg); 6007 if (tr->dst.addr.type == PF_ADDR_TABLE) 6008 pfr_update_stats(tr->dst.addr.p.tbl, 6009 (s == NULL) ? pd.dst : 6010 &s->key[(s->direction == PF_IN)]-> 6011 addr[(s->direction == PF_IN)], 6012 pd.af, pd.tot_len, dir == PF_OUT, 6013 r->action == PF_PASS, tr->dst.neg); 6014 } 6015 6016 switch (action) { 6017 case PF_SYNPROXY_DROP: 6018 m_freem(*m0); 6019 case PF_DEFER: 6020 *m0 = NULL; 6021 action = PF_PASS; 6022 break; 6023 default: 6024 /* pf_route() returns unlocked. */ 6025 if (r->rt) { 6026 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6027 return (action); 6028 } 6029 break; 6030 } 6031 if (s) 6032 PF_STATE_UNLOCK(s); 6033 6034 return (action); 6035} 6036#endif /* INET */ 6037 6038#ifdef INET6 6039int 6040pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6041{ 6042 struct pfi_kif *kif; 6043 u_short action, reason = 0, log = 0; 6044 struct mbuf *m = *m0, *n = NULL; 6045 struct ip6_hdr *h = NULL; 6046 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6047 struct pf_state *s = NULL; 6048 struct pf_ruleset *ruleset = NULL; 6049 struct pf_pdesc pd; 6050 int off, terminal = 0, dirndx, rh_cnt = 0; 6051 6052 M_ASSERTPKTHDR(m); 6053 6054 if (!V_pf_status.running) 6055 return (PF_PASS); 6056 6057 memset(&pd, 0, sizeof(pd)); 6058 pd.pf_mtag = pf_find_mtag(m); 6059 6060 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6061 return (PF_PASS); 6062 6063 kif = (struct pfi_kif *)ifp->if_pf_kif; 6064 if (kif == NULL) { 6065 DPFPRINTF(PF_DEBUG_URGENT, 6066 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6067 return (PF_DROP); 6068 } 6069 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6070 return (PF_PASS); 6071 6072 PF_RULES_RLOCK(); 6073 6074 /* We do IP header normalization and packet reassembly here */ 6075 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6076 action = PF_DROP; 6077 goto done; 6078 } 6079 m = *m0; /* pf_normalize messes with m0 */ 6080 h = mtod(m, struct ip6_hdr *); 6081 6082#if 1 6083 /* 6084 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6085 * will do something bad, so drop the packet for now. 6086 */ 6087 if (htons(h->ip6_plen) == 0) { 6088 action = PF_DROP; 6089 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6090 goto done; 6091 } 6092#endif 6093 6094 pd.src = (struct pf_addr *)&h->ip6_src; 6095 pd.dst = (struct pf_addr *)&h->ip6_dst; 6096 pd.sport = pd.dport = NULL; 6097 pd.ip_sum = NULL; 6098 pd.proto_sum = NULL; 6099 pd.dir = dir; 6100 pd.sidx = (dir == PF_IN) ? 0 : 1; 6101 pd.didx = (dir == PF_IN) ? 1 : 0; 6102 pd.af = AF_INET6; 6103 pd.tos = 0; 6104 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6105 6106 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6107 pd.proto = h->ip6_nxt; 6108 do { 6109 switch (pd.proto) { 6110 case IPPROTO_FRAGMENT: 6111 action = pf_test_fragment(&r, dir, kif, m, h, 6112 &pd, &a, &ruleset); 6113 if (action == PF_DROP) 6114 REASON_SET(&reason, PFRES_FRAG); 6115 goto done; 6116 case IPPROTO_ROUTING: { 6117 struct ip6_rthdr rthdr; 6118 6119 if (rh_cnt++) { 6120 DPFPRINTF(PF_DEBUG_MISC, 6121 ("pf: IPv6 more than one rthdr\n")); 6122 action = PF_DROP; 6123 REASON_SET(&reason, PFRES_IPOPTIONS); 6124 log = 1; 6125 goto done; 6126 } 6127 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6128 &reason, pd.af)) { 6129 DPFPRINTF(PF_DEBUG_MISC, 6130 ("pf: IPv6 short rthdr\n")); 6131 action = PF_DROP; 6132 REASON_SET(&reason, PFRES_SHORT); 6133 log = 1; 6134 goto done; 6135 } 6136 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6137 DPFPRINTF(PF_DEBUG_MISC, 6138 ("pf: IPv6 rthdr0\n")); 6139 action = PF_DROP; 6140 REASON_SET(&reason, PFRES_IPOPTIONS); 6141 log = 1; 6142 goto done; 6143 } 6144 /* FALLTHROUGH */ 6145 } 6146 case IPPROTO_AH: 6147 case IPPROTO_HOPOPTS: 6148 case IPPROTO_DSTOPTS: { 6149 /* get next header and header length */ 6150 struct ip6_ext opt6; 6151 6152 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6153 NULL, &reason, pd.af)) { 6154 DPFPRINTF(PF_DEBUG_MISC, 6155 ("pf: IPv6 short opt\n")); 6156 action = PF_DROP; 6157 log = 1; 6158 goto done; 6159 } 6160 if (pd.proto == IPPROTO_AH) 6161 off += (opt6.ip6e_len + 2) * 4; 6162 else 6163 off += (opt6.ip6e_len + 1) * 8; 6164 pd.proto = opt6.ip6e_nxt; 6165 /* goto the next header */ 6166 break; 6167 } 6168 default: 6169 terminal++; 6170 break; 6171 } 6172 } while (!terminal); 6173 6174 /* if there's no routing header, use unmodified mbuf for checksumming */ 6175 if (!n) 6176 n = m; 6177 6178 switch (pd.proto) { 6179 6180 case IPPROTO_TCP: { 6181 struct tcphdr th; 6182 6183 pd.hdr.tcp = &th; 6184 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6185 &action, &reason, AF_INET6)) { 6186 log = action != PF_PASS; 6187 goto done; 6188 } 6189 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6190 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6191 if (action == PF_DROP) 6192 goto done; 6193 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6194 &reason); 6195 if (action == PF_PASS) { 6196 if (pfsync_update_state_ptr != NULL) 6197 pfsync_update_state_ptr(s); 6198 r = s->rule.ptr; 6199 a = s->anchor.ptr; 6200 log = s->log; 6201 } else if (s == NULL) 6202 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6203 &a, &ruleset, inp); 6204 break; 6205 } 6206 6207 case IPPROTO_UDP: { 6208 struct udphdr uh; 6209 6210 pd.hdr.udp = &uh; 6211 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6212 &action, &reason, AF_INET6)) { 6213 log = action != PF_PASS; 6214 goto done; 6215 } 6216 if (uh.uh_dport == 0 || 6217 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6218 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6219 action = PF_DROP; 6220 REASON_SET(&reason, PFRES_SHORT); 6221 goto done; 6222 } 6223 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6224 if (action == PF_PASS) { 6225 if (pfsync_update_state_ptr != NULL) 6226 pfsync_update_state_ptr(s); 6227 r = s->rule.ptr; 6228 a = s->anchor.ptr; 6229 log = s->log; 6230 } else if (s == NULL) 6231 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6232 &a, &ruleset, inp); 6233 break; 6234 } 6235 6236 case IPPROTO_ICMP: { 6237 action = PF_DROP; 6238 DPFPRINTF(PF_DEBUG_MISC, 6239 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6240 goto done; 6241 } 6242 6243 case IPPROTO_ICMPV6: { 6244 struct icmp6_hdr ih; 6245 6246 pd.hdr.icmp6 = &ih; 6247 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6248 &action, &reason, AF_INET6)) { 6249 log = action != PF_PASS; 6250 goto done; 6251 } 6252 action = pf_test_state_icmp(&s, dir, kif, 6253 m, off, h, &pd, &reason); 6254 if (action == PF_PASS) { 6255 if (pfsync_update_state_ptr != NULL) 6256 pfsync_update_state_ptr(s); 6257 r = s->rule.ptr; 6258 a = s->anchor.ptr; 6259 log = s->log; 6260 } else if (s == NULL) 6261 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6262 &a, &ruleset, inp); 6263 break; 6264 } 6265 6266 default: 6267 action = pf_test_state_other(&s, dir, kif, m, &pd); 6268 if (action == PF_PASS) { 6269 if (pfsync_update_state_ptr != NULL) 6270 pfsync_update_state_ptr(s); 6271 r = s->rule.ptr; 6272 a = s->anchor.ptr; 6273 log = s->log; 6274 } else if (s == NULL) 6275 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6276 &a, &ruleset, inp); 6277 break; 6278 } 6279 6280done: 6281 PF_RULES_RUNLOCK(); 6282 if (n != m) { 6283 m_freem(n); 6284 n = NULL; 6285 } 6286 6287 /* handle dangerous IPv6 extension headers. */ 6288 if (action == PF_PASS && rh_cnt && 6289 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6290 action = PF_DROP; 6291 REASON_SET(&reason, PFRES_IPOPTIONS); 6292 log = 1; 6293 DPFPRINTF(PF_DEBUG_MISC, 6294 ("pf: dropping packet with dangerous v6 headers\n")); 6295 } 6296 6297 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6298 action = PF_DROP; 6299 REASON_SET(&reason, PFRES_MEMORY); 6300 } 6301 if (r->rtableid >= 0) 6302 M_SETFIB(m, r->rtableid); 6303 6304#ifdef ALTQ 6305 if (action == PF_PASS && r->qid) { 6306 if (pd.pf_mtag == NULL && 6307 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6308 action = PF_DROP; 6309 REASON_SET(&reason, PFRES_MEMORY); 6310 } 6311 if (pd.tos & IPTOS_LOWDELAY) 6312 pd.pf_mtag->qid = r->pqid; 6313 else 6314 pd.pf_mtag->qid = r->qid; 6315 /* add hints for ecn */ 6316 pd.pf_mtag->hdr = h; 6317 } 6318#endif /* ALTQ */ 6319 6320 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6321 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6322 (s->nat_rule.ptr->action == PF_RDR || 6323 s->nat_rule.ptr->action == PF_BINAT) && 6324 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6325 m->m_flags |= M_SKIP_FIREWALL; 6326 6327 /* XXX: Anybody working on it?! */ 6328 if (r->divert.port) 6329 printf("pf: divert(9) is not supported for IPv6\n"); 6330 6331 if (log) { 6332 struct pf_rule *lr; 6333 6334 if (s != NULL && s->nat_rule.ptr != NULL && 6335 s->nat_rule.ptr->log & PF_LOG_ALL) 6336 lr = s->nat_rule.ptr; 6337 else 6338 lr = r; 6339 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6340 &pd, (s == NULL)); 6341 } 6342 6343 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6344 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6345 6346 if (action == PF_PASS || r->action == PF_DROP) { 6347 dirndx = (dir == PF_OUT); 6348 r->packets[dirndx]++; 6349 r->bytes[dirndx] += pd.tot_len; 6350 if (a != NULL) { 6351 a->packets[dirndx]++; 6352 a->bytes[dirndx] += pd.tot_len; 6353 } 6354 if (s != NULL) { 6355 if (s->nat_rule.ptr != NULL) { 6356 s->nat_rule.ptr->packets[dirndx]++; 6357 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6358 } 6359 if (s->src_node != NULL) { 6360 s->src_node->packets[dirndx]++; 6361 s->src_node->bytes[dirndx] += pd.tot_len; 6362 } 6363 if (s->nat_src_node != NULL) { 6364 s->nat_src_node->packets[dirndx]++; 6365 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6366 } 6367 dirndx = (dir == s->direction) ? 0 : 1; 6368 s->packets[dirndx]++; 6369 s->bytes[dirndx] += pd.tot_len; 6370 } 6371 tr = r; 6372 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6373 if (nr != NULL && r == &V_pf_default_rule) 6374 tr = nr; 6375 if (tr->src.addr.type == PF_ADDR_TABLE) 6376 pfr_update_stats(tr->src.addr.p.tbl, 6377 (s == NULL) ? pd.src : 6378 &s->key[(s->direction == PF_IN)]->addr[0], 6379 pd.af, pd.tot_len, dir == PF_OUT, 6380 r->action == PF_PASS, tr->src.neg); 6381 if (tr->dst.addr.type == PF_ADDR_TABLE) 6382 pfr_update_stats(tr->dst.addr.p.tbl, 6383 (s == NULL) ? pd.dst : 6384 &s->key[(s->direction == PF_IN)]->addr[1], 6385 pd.af, pd.tot_len, dir == PF_OUT, 6386 r->action == PF_PASS, tr->dst.neg); 6387 } 6388 6389 switch (action) { 6390 case PF_SYNPROXY_DROP: 6391 m_freem(*m0); 6392 case PF_DEFER: 6393 *m0 = NULL; 6394 action = PF_PASS; 6395 break; 6396 default: 6397 /* pf_route6() returns unlocked. */ 6398 if (r->rt) { 6399 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6400 return (action); 6401 } 6402 break; 6403 } 6404 6405 if (s) 6406 PF_STATE_UNLOCK(s); 6407 6408 return (action); 6409} 6410#endif /* INET6 */ 6411