pf.c revision 316641
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 316641 2017-04-08 09:49:21Z kp $"); 40 41#include "opt_inet.h" 42#include "opt_inet6.h" 43#include "opt_bpf.h" 44#include "opt_pf.h" 45 46#include <sys/param.h> 47#include <sys/bus.h> 48#include <sys/endian.h> 49#include <sys/hash.h> 50#include <sys/interrupt.h> 51#include <sys/kernel.h> 52#include <sys/kthread.h> 53#include <sys/limits.h> 54#include <sys/mbuf.h> 55#include <sys/md5.h> 56#include <sys/random.h> 57#include <sys/refcount.h> 58#include <sys/socket.h> 59#include <sys/sysctl.h> 60#include <sys/taskqueue.h> 61#include <sys/ucred.h> 62 63#include <net/if.h> 64#include <net/if_types.h> 65#include <net/route.h> 66#include <net/radix_mpath.h> 67#include <net/vnet.h> 68 69#include <net/pfvar.h> 70#include <net/if_pflog.h> 71#include <net/if_pfsync.h> 72 73#include <netinet/in_pcb.h> 74#include <netinet/in_var.h> 75#include <netinet/ip.h> 76#include <netinet/ip_fw.h> 77#include <netinet/ip_icmp.h> 78#include <netinet/icmp_var.h> 79#include <netinet/ip_var.h> 80#include <netinet/tcp.h> 81#include <netinet/tcp_fsm.h> 82#include <netinet/tcp_seq.h> 83#include <netinet/tcp_timer.h> 84#include <netinet/tcp_var.h> 85#include <netinet/udp.h> 86#include <netinet/udp_var.h> 87 88#include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */ 89 90#ifdef INET6 91#include <netinet/ip6.h> 92#include <netinet/icmp6.h> 93#include <netinet6/nd6.h> 94#include <netinet6/ip6_var.h> 95#include <netinet6/in6_pcb.h> 96#endif /* INET6 */ 97 98#include <machine/in_cksum.h> 99#include <security/mac/mac_framework.h> 100 101#define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 102 103/* 104 * Global variables 105 */ 106 107/* state tables */ 108VNET_DEFINE(struct pf_altqqueue, pf_altqs[2]); 109VNET_DEFINE(struct pf_palist, pf_pabuf); 110VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 111VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 112VNET_DEFINE(struct pf_kstatus, pf_status); 113 114VNET_DEFINE(u_int32_t, ticket_altqs_active); 115VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 116VNET_DEFINE(int, altqs_inactive_open); 117VNET_DEFINE(u_int32_t, ticket_pabuf); 118 119VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 120#define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 121VNET_DEFINE(u_char, pf_tcp_secret[16]); 122#define V_pf_tcp_secret VNET(pf_tcp_secret) 123VNET_DEFINE(int, pf_tcp_secret_init); 124#define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 125VNET_DEFINE(int, pf_tcp_iss_off); 126#define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 127 128/* 129 * Queue for pf_intr() sends. 130 */ 131static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 132struct pf_send_entry { 133 STAILQ_ENTRY(pf_send_entry) pfse_next; 134 struct mbuf *pfse_m; 135 enum { 136 PFSE_IP, 137 PFSE_IP6, 138 PFSE_ICMP, 139 PFSE_ICMP6, 140 } pfse_type; 141 union { 142 struct route ro; 143 struct { 144 int type; 145 int code; 146 int mtu; 147 } icmpopts; 148 } u; 149#define pfse_ro u.ro 150#define pfse_icmp_type u.icmpopts.type 151#define pfse_icmp_code u.icmpopts.code 152#define pfse_icmp_mtu u.icmpopts.mtu 153}; 154 155STAILQ_HEAD(pf_send_head, pf_send_entry); 156static VNET_DEFINE(struct pf_send_head, pf_sendqueue); 157#define V_pf_sendqueue VNET(pf_sendqueue) 158 159static struct mtx pf_sendqueue_mtx; 160#define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 161#define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 162 163/* 164 * Queue for pf_overload_task() tasks. 165 */ 166struct pf_overload_entry { 167 SLIST_ENTRY(pf_overload_entry) next; 168 struct pf_addr addr; 169 sa_family_t af; 170 uint8_t dir; 171 struct pf_rule *rule; 172}; 173 174SLIST_HEAD(pf_overload_head, pf_overload_entry); 175static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue); 176#define V_pf_overloadqueue VNET(pf_overloadqueue) 177static VNET_DEFINE(struct task, pf_overloadtask); 178#define V_pf_overloadtask VNET(pf_overloadtask) 179 180static struct mtx pf_overloadqueue_mtx; 181#define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) 182#define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) 183 184VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules); 185struct mtx pf_unlnkdrules_mtx; 186 187static VNET_DEFINE(uma_zone_t, pf_sources_z); 188#define V_pf_sources_z VNET(pf_sources_z) 189uma_zone_t pf_mtag_z; 190VNET_DEFINE(uma_zone_t, pf_state_z); 191VNET_DEFINE(uma_zone_t, pf_state_key_z); 192 193VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]); 194#define PFID_CPUBITS 8 195#define PFID_CPUSHIFT (sizeof(uint64_t) * NBBY - PFID_CPUBITS) 196#define PFID_CPUMASK ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT) 197#define PFID_MAXID (~PFID_CPUMASK) 198CTASSERT((1 << PFID_CPUBITS) >= MAXCPU); 199 200static void pf_src_tree_remove_state(struct pf_state *); 201static void pf_init_threshold(struct pf_threshold *, u_int32_t, 202 u_int32_t); 203static void pf_add_threshold(struct pf_threshold *); 204static int pf_check_threshold(struct pf_threshold *); 205 206static void pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *, 207 u_int16_t *, u_int16_t *, struct pf_addr *, 208 u_int16_t, u_int8_t, sa_family_t); 209static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 210 struct tcphdr *, struct pf_state_peer *); 211static void pf_change_icmp(struct pf_addr *, u_int16_t *, 212 struct pf_addr *, struct pf_addr *, u_int16_t, 213 u_int16_t *, u_int16_t *, u_int16_t *, 214 u_int16_t *, u_int8_t, sa_family_t); 215static void pf_send_tcp(struct mbuf *, 216 const struct pf_rule *, sa_family_t, 217 const struct pf_addr *, const struct pf_addr *, 218 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 219 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 220 u_int16_t, struct ifnet *); 221static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 222 sa_family_t, struct pf_rule *); 223static void pf_detach_state(struct pf_state *); 224static int pf_state_key_attach(struct pf_state_key *, 225 struct pf_state_key *, struct pf_state *); 226static void pf_state_key_detach(struct pf_state *, int); 227static int pf_state_key_ctor(void *, int, void *, int); 228static u_int32_t pf_tcp_iss(struct pf_pdesc *); 229static int pf_test_rule(struct pf_rule **, struct pf_state **, 230 int, struct pfi_kif *, struct mbuf *, int, 231 struct pf_pdesc *, struct pf_rule **, 232 struct pf_ruleset **, struct inpcb *); 233static int pf_create_state(struct pf_rule *, struct pf_rule *, 234 struct pf_rule *, struct pf_pdesc *, 235 struct pf_src_node *, struct pf_state_key *, 236 struct pf_state_key *, struct mbuf *, int, 237 u_int16_t, u_int16_t, int *, struct pfi_kif *, 238 struct pf_state **, int, u_int16_t, u_int16_t, 239 int); 240static int pf_test_fragment(struct pf_rule **, int, 241 struct pfi_kif *, struct mbuf *, void *, 242 struct pf_pdesc *, struct pf_rule **, 243 struct pf_ruleset **); 244static int pf_tcp_track_full(struct pf_state_peer *, 245 struct pf_state_peer *, struct pf_state **, 246 struct pfi_kif *, struct mbuf *, int, 247 struct pf_pdesc *, u_short *, int *); 248static int pf_tcp_track_sloppy(struct pf_state_peer *, 249 struct pf_state_peer *, struct pf_state **, 250 struct pf_pdesc *, u_short *); 251static int pf_test_state_tcp(struct pf_state **, int, 252 struct pfi_kif *, struct mbuf *, int, 253 void *, struct pf_pdesc *, u_short *); 254static int pf_test_state_udp(struct pf_state **, int, 255 struct pfi_kif *, struct mbuf *, int, 256 void *, struct pf_pdesc *); 257static int pf_test_state_icmp(struct pf_state **, int, 258 struct pfi_kif *, struct mbuf *, int, 259 void *, struct pf_pdesc *, u_short *); 260static int pf_test_state_other(struct pf_state **, int, 261 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 262static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 263 sa_family_t); 264static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 265 sa_family_t); 266static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 267 int, u_int16_t); 268static int pf_check_proto_cksum(struct mbuf *, int, int, 269 u_int8_t, sa_family_t); 270static void pf_print_state_parts(struct pf_state *, 271 struct pf_state_key *, struct pf_state_key *); 272static int pf_addr_wrap_neq(struct pf_addr_wrap *, 273 struct pf_addr_wrap *); 274static struct pf_state *pf_find_state(struct pfi_kif *, 275 struct pf_state_key_cmp *, u_int); 276static int pf_src_connlimit(struct pf_state **); 277static void pf_overload_task(void *v, int pending); 278static int pf_insert_src_node(struct pf_src_node **, 279 struct pf_rule *, struct pf_addr *, sa_family_t); 280static u_int pf_purge_expired_states(u_int, int); 281static void pf_purge_unlinked_rules(void); 282static int pf_mtag_uminit(void *, int, int); 283static void pf_mtag_free(struct m_tag *); 284#ifdef INET 285static void pf_route(struct mbuf **, struct pf_rule *, int, 286 struct ifnet *, struct pf_state *, 287 struct pf_pdesc *); 288#endif /* INET */ 289#ifdef INET6 290static void pf_change_a6(struct pf_addr *, u_int16_t *, 291 struct pf_addr *, u_int8_t); 292static void pf_route6(struct mbuf **, struct pf_rule *, int, 293 struct ifnet *, struct pf_state *, 294 struct pf_pdesc *); 295#endif /* INET6 */ 296 297int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 298 299VNET_DECLARE(int, pf_end_threads); 300 301VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 302 303#define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 304 (pd)->pf_mtag->flags & PF_PACKET_LOOPED) 305 306#define STATE_LOOKUP(i, k, d, s, pd) \ 307 do { \ 308 (s) = pf_find_state((i), (k), (d)); \ 309 if ((s) == NULL) \ 310 return (PF_DROP); \ 311 if (PACKET_LOOPED(pd)) \ 312 return (PF_PASS); \ 313 if ((d) == PF_OUT && \ 314 (((s)->rule.ptr->rt == PF_ROUTETO && \ 315 (s)->rule.ptr->direction == PF_OUT) || \ 316 ((s)->rule.ptr->rt == PF_REPLYTO && \ 317 (s)->rule.ptr->direction == PF_IN)) && \ 318 (s)->rt_kif != NULL && \ 319 (s)->rt_kif != (i)) \ 320 return (PF_PASS); \ 321 } while (0) 322 323#define BOUND_IFACE(r, k) \ 324 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 325 326#define STATE_INC_COUNTERS(s) \ 327 do { \ 328 counter_u64_add(s->rule.ptr->states_cur, 1); \ 329 counter_u64_add(s->rule.ptr->states_tot, 1); \ 330 if (s->anchor.ptr != NULL) { \ 331 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 332 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 333 } \ 334 if (s->nat_rule.ptr != NULL) { \ 335 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 336 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 337 } \ 338 } while (0) 339 340#define STATE_DEC_COUNTERS(s) \ 341 do { \ 342 if (s->nat_rule.ptr != NULL) \ 343 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 344 if (s->anchor.ptr != NULL) \ 345 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 346 counter_u64_add(s->rule.ptr->states_cur, -1); \ 347 } while (0) 348 349static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 350VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 351VNET_DEFINE(struct pf_idhash *, pf_idhash); 352VNET_DEFINE(struct pf_srchash *, pf_srchash); 353 354SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)"); 355 356u_long pf_hashmask; 357u_long pf_srchashmask; 358static u_long pf_hashsize; 359static u_long pf_srchashsize; 360 361SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 362 &pf_hashsize, 0, "Size of pf(4) states hashtable"); 363SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 364 &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable"); 365 366VNET_DEFINE(void *, pf_swi_cookie); 367 368VNET_DEFINE(uint32_t, pf_hashseed); 369#define V_pf_hashseed VNET(pf_hashseed) 370 371int 372pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af) 373{ 374 375 switch (af) { 376#ifdef INET 377 case AF_INET: 378 if (a->addr32[0] > b->addr32[0]) 379 return (1); 380 if (a->addr32[0] < b->addr32[0]) 381 return (-1); 382 break; 383#endif /* INET */ 384#ifdef INET6 385 case AF_INET6: 386 if (a->addr32[3] > b->addr32[3]) 387 return (1); 388 if (a->addr32[3] < b->addr32[3]) 389 return (-1); 390 if (a->addr32[2] > b->addr32[2]) 391 return (1); 392 if (a->addr32[2] < b->addr32[2]) 393 return (-1); 394 if (a->addr32[1] > b->addr32[1]) 395 return (1); 396 if (a->addr32[1] < b->addr32[1]) 397 return (-1); 398 if (a->addr32[0] > b->addr32[0]) 399 return (1); 400 if (a->addr32[0] < b->addr32[0]) 401 return (-1); 402 break; 403#endif /* INET6 */ 404 default: 405 panic("%s: unknown address family %u", __func__, af); 406 } 407 return (0); 408} 409 410static __inline uint32_t 411pf_hashkey(struct pf_state_key *sk) 412{ 413 uint32_t h; 414 415 h = murmur3_aligned_32((uint32_t *)sk, 416 sizeof(struct pf_state_key_cmp), 417 V_pf_hashseed); 418 419 return (h & pf_hashmask); 420} 421 422static __inline uint32_t 423pf_hashsrc(struct pf_addr *addr, sa_family_t af) 424{ 425 uint32_t h; 426 427 switch (af) { 428 case AF_INET: 429 h = murmur3_aligned_32((uint32_t *)&addr->v4, 430 sizeof(addr->v4), V_pf_hashseed); 431 break; 432 case AF_INET6: 433 h = murmur3_aligned_32((uint32_t *)&addr->v6, 434 sizeof(addr->v6), V_pf_hashseed); 435 break; 436 default: 437 panic("%s: unknown address family %u", __func__, af); 438 } 439 440 return (h & pf_srchashmask); 441} 442 443#ifdef ALTQ 444static int 445pf_state_hash(struct pf_state *s) 446{ 447 u_int32_t hv = (intptr_t)s / sizeof(*s); 448 449 hv ^= crc32(&s->src, sizeof(s->src)); 450 hv ^= crc32(&s->dst, sizeof(s->dst)); 451 if (hv == 0) 452 hv = 1; 453 return (hv); 454} 455#endif 456 457#ifdef INET6 458void 459pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 460{ 461 switch (af) { 462#ifdef INET 463 case AF_INET: 464 dst->addr32[0] = src->addr32[0]; 465 break; 466#endif /* INET */ 467 case AF_INET6: 468 dst->addr32[0] = src->addr32[0]; 469 dst->addr32[1] = src->addr32[1]; 470 dst->addr32[2] = src->addr32[2]; 471 dst->addr32[3] = src->addr32[3]; 472 break; 473 } 474} 475#endif /* INET6 */ 476 477static void 478pf_init_threshold(struct pf_threshold *threshold, 479 u_int32_t limit, u_int32_t seconds) 480{ 481 threshold->limit = limit * PF_THRESHOLD_MULT; 482 threshold->seconds = seconds; 483 threshold->count = 0; 484 threshold->last = time_uptime; 485} 486 487static void 488pf_add_threshold(struct pf_threshold *threshold) 489{ 490 u_int32_t t = time_uptime, diff = t - threshold->last; 491 492 if (diff >= threshold->seconds) 493 threshold->count = 0; 494 else 495 threshold->count -= threshold->count * diff / 496 threshold->seconds; 497 threshold->count += PF_THRESHOLD_MULT; 498 threshold->last = t; 499} 500 501static int 502pf_check_threshold(struct pf_threshold *threshold) 503{ 504 return (threshold->count > threshold->limit); 505} 506 507static int 508pf_src_connlimit(struct pf_state **state) 509{ 510 struct pf_overload_entry *pfoe; 511 int bad = 0; 512 513 PF_STATE_LOCK_ASSERT(*state); 514 515 (*state)->src_node->conn++; 516 (*state)->src.tcp_est = 1; 517 pf_add_threshold(&(*state)->src_node->conn_rate); 518 519 if ((*state)->rule.ptr->max_src_conn && 520 (*state)->rule.ptr->max_src_conn < 521 (*state)->src_node->conn) { 522 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 523 bad++; 524 } 525 526 if ((*state)->rule.ptr->max_src_conn_rate.limit && 527 pf_check_threshold(&(*state)->src_node->conn_rate)) { 528 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 529 bad++; 530 } 531 532 if (!bad) 533 return (0); 534 535 /* Kill this state. */ 536 (*state)->timeout = PFTM_PURGE; 537 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 538 539 if ((*state)->rule.ptr->overload_tbl == NULL) 540 return (1); 541 542 /* Schedule overloading and flushing task. */ 543 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 544 if (pfoe == NULL) 545 return (1); /* too bad :( */ 546 547 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 548 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 549 pfoe->rule = (*state)->rule.ptr; 550 pfoe->dir = (*state)->direction; 551 PF_OVERLOADQ_LOCK(); 552 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 553 PF_OVERLOADQ_UNLOCK(); 554 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 555 556 return (1); 557} 558 559static void 560pf_overload_task(void *v, int pending) 561{ 562 struct pf_overload_head queue; 563 struct pfr_addr p; 564 struct pf_overload_entry *pfoe, *pfoe1; 565 uint32_t killed = 0; 566 567 CURVNET_SET((struct vnet *)v); 568 569 PF_OVERLOADQ_LOCK(); 570 queue = V_pf_overloadqueue; 571 SLIST_INIT(&V_pf_overloadqueue); 572 PF_OVERLOADQ_UNLOCK(); 573 574 bzero(&p, sizeof(p)); 575 SLIST_FOREACH(pfoe, &queue, next) { 576 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 577 if (V_pf_status.debug >= PF_DEBUG_MISC) { 578 printf("%s: blocking address ", __func__); 579 pf_print_host(&pfoe->addr, 0, pfoe->af); 580 printf("\n"); 581 } 582 583 p.pfra_af = pfoe->af; 584 switch (pfoe->af) { 585#ifdef INET 586 case AF_INET: 587 p.pfra_net = 32; 588 p.pfra_ip4addr = pfoe->addr.v4; 589 break; 590#endif 591#ifdef INET6 592 case AF_INET6: 593 p.pfra_net = 128; 594 p.pfra_ip6addr = pfoe->addr.v6; 595 break; 596#endif 597 } 598 599 PF_RULES_WLOCK(); 600 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 601 PF_RULES_WUNLOCK(); 602 } 603 604 /* 605 * Remove those entries, that don't need flushing. 606 */ 607 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 608 if (pfoe->rule->flush == 0) { 609 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 610 free(pfoe, M_PFTEMP); 611 } else 612 counter_u64_add( 613 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 614 615 /* If nothing to flush, return. */ 616 if (SLIST_EMPTY(&queue)) { 617 CURVNET_RESTORE(); 618 return; 619 } 620 621 for (int i = 0; i <= pf_hashmask; i++) { 622 struct pf_idhash *ih = &V_pf_idhash[i]; 623 struct pf_state_key *sk; 624 struct pf_state *s; 625 626 PF_HASHROW_LOCK(ih); 627 LIST_FOREACH(s, &ih->states, entry) { 628 sk = s->key[PF_SK_WIRE]; 629 SLIST_FOREACH(pfoe, &queue, next) 630 if (sk->af == pfoe->af && 631 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 632 pfoe->rule == s->rule.ptr) && 633 ((pfoe->dir == PF_OUT && 634 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 635 (pfoe->dir == PF_IN && 636 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 637 s->timeout = PFTM_PURGE; 638 s->src.state = s->dst.state = TCPS_CLOSED; 639 killed++; 640 } 641 } 642 PF_HASHROW_UNLOCK(ih); 643 } 644 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 645 free(pfoe, M_PFTEMP); 646 if (V_pf_status.debug >= PF_DEBUG_MISC) 647 printf("%s: %u states killed", __func__, killed); 648 649 CURVNET_RESTORE(); 650} 651 652/* 653 * Can return locked on failure, so that we can consistently 654 * allocate and insert a new one. 655 */ 656struct pf_src_node * 657pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 658 int returnlocked) 659{ 660 struct pf_srchash *sh; 661 struct pf_src_node *n; 662 663 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 664 665 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 666 PF_HASHROW_LOCK(sh); 667 LIST_FOREACH(n, &sh->nodes, entry) 668 if (n->rule.ptr == rule && n->af == af && 669 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 670 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 671 break; 672 if (n != NULL) { 673 n->states++; 674 PF_HASHROW_UNLOCK(sh); 675 } else if (returnlocked == 0) 676 PF_HASHROW_UNLOCK(sh); 677 678 return (n); 679} 680 681static int 682pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 683 struct pf_addr *src, sa_family_t af) 684{ 685 686 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 687 rule->rpool.opts & PF_POOL_STICKYADDR), 688 ("%s for non-tracking rule %p", __func__, rule)); 689 690 if (*sn == NULL) 691 *sn = pf_find_src_node(src, rule, af, 1); 692 693 if (*sn == NULL) { 694 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 695 696 PF_HASHROW_ASSERT(sh); 697 698 if (!rule->max_src_nodes || 699 counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) 700 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 701 else 702 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 703 1); 704 if ((*sn) == NULL) { 705 PF_HASHROW_UNLOCK(sh); 706 return (-1); 707 } 708 709 pf_init_threshold(&(*sn)->conn_rate, 710 rule->max_src_conn_rate.limit, 711 rule->max_src_conn_rate.seconds); 712 713 (*sn)->af = af; 714 (*sn)->rule.ptr = rule; 715 PF_ACPY(&(*sn)->addr, src, af); 716 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 717 (*sn)->creation = time_uptime; 718 (*sn)->ruletype = rule->action; 719 (*sn)->states = 1; 720 if ((*sn)->rule.ptr != NULL) 721 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 722 PF_HASHROW_UNLOCK(sh); 723 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 724 } else { 725 if (rule->max_src_states && 726 (*sn)->states >= rule->max_src_states) { 727 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 728 1); 729 return (-1); 730 } 731 } 732 return (0); 733} 734 735void 736pf_unlink_src_node(struct pf_src_node *src) 737{ 738 739 PF_HASHROW_ASSERT(&V_pf_srchash[pf_hashsrc(&src->addr, src->af)]); 740 LIST_REMOVE(src, entry); 741 if (src->rule.ptr) 742 counter_u64_add(src->rule.ptr->src_nodes, -1); 743} 744 745u_int 746pf_free_src_nodes(struct pf_src_node_list *head) 747{ 748 struct pf_src_node *sn, *tmp; 749 u_int count = 0; 750 751 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 752 uma_zfree(V_pf_sources_z, sn); 753 count++; 754 } 755 756 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count); 757 758 return (count); 759} 760 761void 762pf_mtag_initialize() 763{ 764 765 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 766 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 767 UMA_ALIGN_PTR, 0); 768} 769 770/* Per-vnet data storage structures initialization. */ 771void 772pf_initialize() 773{ 774 struct pf_keyhash *kh; 775 struct pf_idhash *ih; 776 struct pf_srchash *sh; 777 u_int i; 778 779 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &pf_hashsize); 780 if (pf_hashsize == 0 || !powerof2(pf_hashsize)) 781 pf_hashsize = PF_HASHSIZ; 782 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &pf_srchashsize); 783 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) 784 pf_srchashsize = PF_HASHSIZ / 4; 785 786 V_pf_hashseed = arc4random(); 787 788 /* States and state keys storage. */ 789 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 790 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 791 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 792 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 793 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 794 795 V_pf_state_key_z = uma_zcreate("pf state keys", 796 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 797 UMA_ALIGN_PTR, 0); 798 V_pf_keyhash = malloc(pf_hashsize * sizeof(struct pf_keyhash), 799 M_PFHASH, M_WAITOK | M_ZERO); 800 V_pf_idhash = malloc(pf_hashsize * sizeof(struct pf_idhash), 801 M_PFHASH, M_WAITOK | M_ZERO); 802 pf_hashmask = pf_hashsize - 1; 803 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 804 i++, kh++, ih++) { 805 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 806 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 807 } 808 809 /* Source nodes. */ 810 V_pf_sources_z = uma_zcreate("pf source nodes", 811 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 812 0); 813 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 814 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 815 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 816 V_pf_srchash = malloc(pf_srchashsize * sizeof(struct pf_srchash), 817 M_PFHASH, M_WAITOK|M_ZERO); 818 pf_srchashmask = pf_srchashsize - 1; 819 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) 820 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 821 822 /* ALTQ */ 823 TAILQ_INIT(&V_pf_altqs[0]); 824 TAILQ_INIT(&V_pf_altqs[1]); 825 TAILQ_INIT(&V_pf_pabuf); 826 V_pf_altqs_active = &V_pf_altqs[0]; 827 V_pf_altqs_inactive = &V_pf_altqs[1]; 828 829 830 /* Send & overload+flush queues. */ 831 STAILQ_INIT(&V_pf_sendqueue); 832 SLIST_INIT(&V_pf_overloadqueue); 833 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 834 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 835 mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL, 836 MTX_DEF); 837 838 /* Unlinked, but may be referenced rules. */ 839 TAILQ_INIT(&V_pf_unlinked_rules); 840 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 841} 842 843void 844pf_mtag_cleanup() 845{ 846 847 uma_zdestroy(pf_mtag_z); 848} 849 850void 851pf_cleanup() 852{ 853 struct pf_keyhash *kh; 854 struct pf_idhash *ih; 855 struct pf_srchash *sh; 856 struct pf_send_entry *pfse, *next; 857 u_int i; 858 859 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 860 i++, kh++, ih++) { 861 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 862 __func__)); 863 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 864 __func__)); 865 mtx_destroy(&kh->lock); 866 mtx_destroy(&ih->lock); 867 } 868 free(V_pf_keyhash, M_PFHASH); 869 free(V_pf_idhash, M_PFHASH); 870 871 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 872 KASSERT(LIST_EMPTY(&sh->nodes), 873 ("%s: source node hash not empty", __func__)); 874 mtx_destroy(&sh->lock); 875 } 876 free(V_pf_srchash, M_PFHASH); 877 878 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 879 m_freem(pfse->pfse_m); 880 free(pfse, M_PFTEMP); 881 } 882 883 mtx_destroy(&pf_sendqueue_mtx); 884 mtx_destroy(&pf_overloadqueue_mtx); 885 mtx_destroy(&pf_unlnkdrules_mtx); 886 887 uma_zdestroy(V_pf_sources_z); 888 uma_zdestroy(V_pf_state_z); 889 uma_zdestroy(V_pf_state_key_z); 890} 891 892static int 893pf_mtag_uminit(void *mem, int size, int how) 894{ 895 struct m_tag *t; 896 897 t = (struct m_tag *)mem; 898 t->m_tag_cookie = MTAG_ABI_COMPAT; 899 t->m_tag_id = PACKET_TAG_PF; 900 t->m_tag_len = sizeof(struct pf_mtag); 901 t->m_tag_free = pf_mtag_free; 902 903 return (0); 904} 905 906static void 907pf_mtag_free(struct m_tag *t) 908{ 909 910 uma_zfree(pf_mtag_z, t); 911} 912 913struct pf_mtag * 914pf_get_mtag(struct mbuf *m) 915{ 916 struct m_tag *mtag; 917 918 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 919 return ((struct pf_mtag *)(mtag + 1)); 920 921 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 922 if (mtag == NULL) 923 return (NULL); 924 bzero(mtag + 1, sizeof(struct pf_mtag)); 925 m_tag_prepend(m, mtag); 926 927 return ((struct pf_mtag *)(mtag + 1)); 928} 929 930static int 931pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 932 struct pf_state *s) 933{ 934 struct pf_keyhash *khs, *khw, *kh; 935 struct pf_state_key *sk, *cur; 936 struct pf_state *si, *olds = NULL; 937 int idx; 938 939 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 940 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 941 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 942 943 /* 944 * We need to lock hash slots of both keys. To avoid deadlock 945 * we always lock the slot with lower address first. Unlock order 946 * isn't important. 947 * 948 * We also need to lock ID hash slot before dropping key 949 * locks. On success we return with ID hash slot locked. 950 */ 951 952 if (skw == sks) { 953 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 954 PF_HASHROW_LOCK(khs); 955 } else { 956 khs = &V_pf_keyhash[pf_hashkey(sks)]; 957 khw = &V_pf_keyhash[pf_hashkey(skw)]; 958 if (khs == khw) { 959 PF_HASHROW_LOCK(khs); 960 } else if (khs < khw) { 961 PF_HASHROW_LOCK(khs); 962 PF_HASHROW_LOCK(khw); 963 } else { 964 PF_HASHROW_LOCK(khw); 965 PF_HASHROW_LOCK(khs); 966 } 967 } 968 969#define KEYS_UNLOCK() do { \ 970 if (khs != khw) { \ 971 PF_HASHROW_UNLOCK(khs); \ 972 PF_HASHROW_UNLOCK(khw); \ 973 } else \ 974 PF_HASHROW_UNLOCK(khs); \ 975} while (0) 976 977 /* 978 * First run: start with wire key. 979 */ 980 sk = skw; 981 kh = khw; 982 idx = PF_SK_WIRE; 983 984keyattach: 985 LIST_FOREACH(cur, &kh->keys, entry) 986 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 987 break; 988 989 if (cur != NULL) { 990 /* Key exists. Check for same kif, if none, add to key. */ 991 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 992 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 993 994 PF_HASHROW_LOCK(ih); 995 if (si->kif == s->kif && 996 si->direction == s->direction) { 997 if (sk->proto == IPPROTO_TCP && 998 si->src.state >= TCPS_FIN_WAIT_2 && 999 si->dst.state >= TCPS_FIN_WAIT_2) { 1000 /* 1001 * New state matches an old >FIN_WAIT_2 1002 * state. We can't drop key hash locks, 1003 * thus we can't unlink it properly. 1004 * 1005 * As a workaround we drop it into 1006 * TCPS_CLOSED state, schedule purge 1007 * ASAP and push it into the very end 1008 * of the slot TAILQ, so that it won't 1009 * conflict with our new state. 1010 */ 1011 si->src.state = si->dst.state = 1012 TCPS_CLOSED; 1013 si->timeout = PFTM_PURGE; 1014 olds = si; 1015 } else { 1016 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1017 printf("pf: %s key attach " 1018 "failed on %s: ", 1019 (idx == PF_SK_WIRE) ? 1020 "wire" : "stack", 1021 s->kif->pfik_name); 1022 pf_print_state_parts(s, 1023 (idx == PF_SK_WIRE) ? 1024 sk : NULL, 1025 (idx == PF_SK_STACK) ? 1026 sk : NULL); 1027 printf(", existing: "); 1028 pf_print_state_parts(si, 1029 (idx == PF_SK_WIRE) ? 1030 sk : NULL, 1031 (idx == PF_SK_STACK) ? 1032 sk : NULL); 1033 printf("\n"); 1034 } 1035 PF_HASHROW_UNLOCK(ih); 1036 KEYS_UNLOCK(); 1037 uma_zfree(V_pf_state_key_z, sk); 1038 if (idx == PF_SK_STACK) 1039 pf_detach_state(s); 1040 return (EEXIST); /* collision! */ 1041 } 1042 } 1043 PF_HASHROW_UNLOCK(ih); 1044 } 1045 uma_zfree(V_pf_state_key_z, sk); 1046 s->key[idx] = cur; 1047 } else { 1048 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1049 s->key[idx] = sk; 1050 } 1051 1052stateattach: 1053 /* List is sorted, if-bound states before floating. */ 1054 if (s->kif == V_pfi_all) 1055 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1056 else 1057 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1058 1059 if (olds) { 1060 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1061 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1062 key_list[idx]); 1063 olds = NULL; 1064 } 1065 1066 /* 1067 * Attach done. See how should we (or should not?) 1068 * attach a second key. 1069 */ 1070 if (sks == skw) { 1071 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1072 idx = PF_SK_STACK; 1073 sks = NULL; 1074 goto stateattach; 1075 } else if (sks != NULL) { 1076 /* 1077 * Continue attaching with stack key. 1078 */ 1079 sk = sks; 1080 kh = khs; 1081 idx = PF_SK_STACK; 1082 sks = NULL; 1083 goto keyattach; 1084 } 1085 1086 PF_STATE_LOCK(s); 1087 KEYS_UNLOCK(); 1088 1089 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1090 ("%s failure", __func__)); 1091 1092 return (0); 1093#undef KEYS_UNLOCK 1094} 1095 1096static void 1097pf_detach_state(struct pf_state *s) 1098{ 1099 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1100 struct pf_keyhash *kh; 1101 1102 if (sks != NULL) { 1103 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1104 PF_HASHROW_LOCK(kh); 1105 if (s->key[PF_SK_STACK] != NULL) 1106 pf_state_key_detach(s, PF_SK_STACK); 1107 /* 1108 * If both point to same key, then we are done. 1109 */ 1110 if (sks == s->key[PF_SK_WIRE]) { 1111 pf_state_key_detach(s, PF_SK_WIRE); 1112 PF_HASHROW_UNLOCK(kh); 1113 return; 1114 } 1115 PF_HASHROW_UNLOCK(kh); 1116 } 1117 1118 if (s->key[PF_SK_WIRE] != NULL) { 1119 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1120 PF_HASHROW_LOCK(kh); 1121 if (s->key[PF_SK_WIRE] != NULL) 1122 pf_state_key_detach(s, PF_SK_WIRE); 1123 PF_HASHROW_UNLOCK(kh); 1124 } 1125} 1126 1127static void 1128pf_state_key_detach(struct pf_state *s, int idx) 1129{ 1130 struct pf_state_key *sk = s->key[idx]; 1131#ifdef INVARIANTS 1132 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1133 1134 PF_HASHROW_ASSERT(kh); 1135#endif 1136 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1137 s->key[idx] = NULL; 1138 1139 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1140 LIST_REMOVE(sk, entry); 1141 uma_zfree(V_pf_state_key_z, sk); 1142 } 1143} 1144 1145static int 1146pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1147{ 1148 struct pf_state_key *sk = mem; 1149 1150 bzero(sk, sizeof(struct pf_state_key_cmp)); 1151 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1152 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1153 1154 return (0); 1155} 1156 1157struct pf_state_key * 1158pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1159 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1160{ 1161 struct pf_state_key *sk; 1162 1163 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1164 if (sk == NULL) 1165 return (NULL); 1166 1167 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1168 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1169 sk->port[pd->sidx] = sport; 1170 sk->port[pd->didx] = dport; 1171 sk->proto = pd->proto; 1172 sk->af = pd->af; 1173 1174 return (sk); 1175} 1176 1177struct pf_state_key * 1178pf_state_key_clone(struct pf_state_key *orig) 1179{ 1180 struct pf_state_key *sk; 1181 1182 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1183 if (sk == NULL) 1184 return (NULL); 1185 1186 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1187 1188 return (sk); 1189} 1190 1191int 1192pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1193 struct pf_state_key *sks, struct pf_state *s) 1194{ 1195 struct pf_idhash *ih; 1196 struct pf_state *cur; 1197 int error; 1198 1199 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1200 ("%s: sks not pristine", __func__)); 1201 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1202 ("%s: skw not pristine", __func__)); 1203 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1204 1205 s->kif = kif; 1206 1207 if (s->id == 0 && s->creatorid == 0) { 1208 /* XXX: should be atomic, but probability of collision low */ 1209 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1210 V_pf_stateid[curcpu] = 1; 1211 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1212 s->id = htobe64(s->id); 1213 s->creatorid = V_pf_status.hostid; 1214 } 1215 1216 /* Returns with ID locked on success. */ 1217 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1218 return (error); 1219 1220 ih = &V_pf_idhash[PF_IDHASH(s)]; 1221 PF_HASHROW_ASSERT(ih); 1222 LIST_FOREACH(cur, &ih->states, entry) 1223 if (cur->id == s->id && cur->creatorid == s->creatorid) 1224 break; 1225 1226 if (cur != NULL) { 1227 PF_HASHROW_UNLOCK(ih); 1228 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1229 printf("pf: state ID collision: " 1230 "id: %016llx creatorid: %08x\n", 1231 (unsigned long long)be64toh(s->id), 1232 ntohl(s->creatorid)); 1233 } 1234 pf_detach_state(s); 1235 return (EEXIST); 1236 } 1237 LIST_INSERT_HEAD(&ih->states, s, entry); 1238 /* One for keys, one for ID hash. */ 1239 refcount_init(&s->refs, 2); 1240 1241 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1242 if (pfsync_insert_state_ptr != NULL) 1243 pfsync_insert_state_ptr(s); 1244 1245 /* Returns locked. */ 1246 return (0); 1247} 1248 1249/* 1250 * Find state by ID: returns with locked row on success. 1251 */ 1252struct pf_state * 1253pf_find_state_byid(uint64_t id, uint32_t creatorid) 1254{ 1255 struct pf_idhash *ih; 1256 struct pf_state *s; 1257 1258 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1259 1260 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; 1261 1262 PF_HASHROW_LOCK(ih); 1263 LIST_FOREACH(s, &ih->states, entry) 1264 if (s->id == id && s->creatorid == creatorid) 1265 break; 1266 1267 if (s == NULL) 1268 PF_HASHROW_UNLOCK(ih); 1269 1270 return (s); 1271} 1272 1273/* 1274 * Find state by key. 1275 * Returns with ID hash slot locked on success. 1276 */ 1277static struct pf_state * 1278pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1279{ 1280 struct pf_keyhash *kh; 1281 struct pf_state_key *sk; 1282 struct pf_state *s; 1283 int idx; 1284 1285 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1286 1287 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1288 1289 PF_HASHROW_LOCK(kh); 1290 LIST_FOREACH(sk, &kh->keys, entry) 1291 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1292 break; 1293 if (sk == NULL) { 1294 PF_HASHROW_UNLOCK(kh); 1295 return (NULL); 1296 } 1297 1298 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1299 1300 /* List is sorted, if-bound states before floating ones. */ 1301 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1302 if (s->kif == V_pfi_all || s->kif == kif) { 1303 PF_STATE_LOCK(s); 1304 PF_HASHROW_UNLOCK(kh); 1305 if (s->timeout >= PFTM_MAX) { 1306 /* 1307 * State is either being processed by 1308 * pf_unlink_state() in an other thread, or 1309 * is scheduled for immediate expiry. 1310 */ 1311 PF_STATE_UNLOCK(s); 1312 return (NULL); 1313 } 1314 return (s); 1315 } 1316 PF_HASHROW_UNLOCK(kh); 1317 1318 return (NULL); 1319} 1320 1321struct pf_state * 1322pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1323{ 1324 struct pf_keyhash *kh; 1325 struct pf_state_key *sk; 1326 struct pf_state *s, *ret = NULL; 1327 int idx, inout = 0; 1328 1329 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1330 1331 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1332 1333 PF_HASHROW_LOCK(kh); 1334 LIST_FOREACH(sk, &kh->keys, entry) 1335 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1336 break; 1337 if (sk == NULL) { 1338 PF_HASHROW_UNLOCK(kh); 1339 return (NULL); 1340 } 1341 switch (dir) { 1342 case PF_IN: 1343 idx = PF_SK_WIRE; 1344 break; 1345 case PF_OUT: 1346 idx = PF_SK_STACK; 1347 break; 1348 case PF_INOUT: 1349 idx = PF_SK_WIRE; 1350 inout = 1; 1351 break; 1352 default: 1353 panic("%s: dir %u", __func__, dir); 1354 } 1355second_run: 1356 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1357 if (more == NULL) { 1358 PF_HASHROW_UNLOCK(kh); 1359 return (s); 1360 } 1361 1362 if (ret) 1363 (*more)++; 1364 else 1365 ret = s; 1366 } 1367 if (inout == 1) { 1368 inout = 0; 1369 idx = PF_SK_STACK; 1370 goto second_run; 1371 } 1372 PF_HASHROW_UNLOCK(kh); 1373 1374 return (ret); 1375} 1376 1377/* END state table stuff */ 1378 1379static void 1380pf_send(struct pf_send_entry *pfse) 1381{ 1382 1383 PF_SENDQ_LOCK(); 1384 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1385 PF_SENDQ_UNLOCK(); 1386 swi_sched(V_pf_swi_cookie, 0); 1387} 1388 1389void 1390pf_intr(void *v) 1391{ 1392 struct pf_send_head queue; 1393 struct pf_send_entry *pfse, *next; 1394 1395 CURVNET_SET((struct vnet *)v); 1396 1397 PF_SENDQ_LOCK(); 1398 queue = V_pf_sendqueue; 1399 STAILQ_INIT(&V_pf_sendqueue); 1400 PF_SENDQ_UNLOCK(); 1401 1402 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1403 switch (pfse->pfse_type) { 1404#ifdef INET 1405 case PFSE_IP: 1406 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1407 break; 1408 case PFSE_ICMP: 1409 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1410 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1411 break; 1412#endif /* INET */ 1413#ifdef INET6 1414 case PFSE_IP6: 1415 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1416 NULL); 1417 break; 1418 case PFSE_ICMP6: 1419 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1420 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1421 break; 1422#endif /* INET6 */ 1423 default: 1424 panic("%s: unknown type", __func__); 1425 } 1426 free(pfse, M_PFTEMP); 1427 } 1428 CURVNET_RESTORE(); 1429} 1430 1431void 1432pf_purge_thread(void *v) 1433{ 1434 u_int idx = 0; 1435 1436 CURVNET_SET((struct vnet *)v); 1437 1438 for (;;) { 1439 PF_RULES_RLOCK(); 1440 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1441 1442 if (V_pf_end_threads) { 1443 /* 1444 * To cleanse up all kifs and rules we need 1445 * two runs: first one clears reference flags, 1446 * then pf_purge_expired_states() doesn't 1447 * raise them, and then second run frees. 1448 */ 1449 PF_RULES_RUNLOCK(); 1450 pf_purge_unlinked_rules(); 1451 pfi_kif_purge(); 1452 1453 /* 1454 * Now purge everything. 1455 */ 1456 pf_purge_expired_states(0, pf_hashmask); 1457 pf_purge_expired_fragments(); 1458 pf_purge_expired_src_nodes(); 1459 1460 /* 1461 * Now all kifs & rules should be unreferenced, 1462 * thus should be successfully freed. 1463 */ 1464 pf_purge_unlinked_rules(); 1465 pfi_kif_purge(); 1466 1467 /* 1468 * Announce success and exit. 1469 */ 1470 PF_RULES_RLOCK(); 1471 V_pf_end_threads++; 1472 PF_RULES_RUNLOCK(); 1473 wakeup(pf_purge_thread); 1474 kproc_exit(0); 1475 } 1476 PF_RULES_RUNLOCK(); 1477 1478 /* Process 1/interval fraction of the state table every run. */ 1479 idx = pf_purge_expired_states(idx, pf_hashmask / 1480 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1481 1482 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1483 if (idx == 0) { 1484 /* 1485 * Order is important: 1486 * - states and src nodes reference rules 1487 * - states and rules reference kifs 1488 */ 1489 pf_purge_expired_fragments(); 1490 pf_purge_expired_src_nodes(); 1491 pf_purge_unlinked_rules(); 1492 pfi_kif_purge(); 1493 } 1494 } 1495 /* not reached */ 1496 CURVNET_RESTORE(); 1497} 1498 1499u_int32_t 1500pf_state_expires(const struct pf_state *state) 1501{ 1502 u_int32_t timeout; 1503 u_int32_t start; 1504 u_int32_t end; 1505 u_int32_t states; 1506 1507 /* handle all PFTM_* > PFTM_MAX here */ 1508 if (state->timeout == PFTM_PURGE) 1509 return (time_uptime); 1510 KASSERT(state->timeout != PFTM_UNLINKED, 1511 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1512 KASSERT((state->timeout < PFTM_MAX), 1513 ("pf_state_expires: timeout > PFTM_MAX")); 1514 timeout = state->rule.ptr->timeout[state->timeout]; 1515 if (!timeout) 1516 timeout = V_pf_default_rule.timeout[state->timeout]; 1517 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1518 if (start) { 1519 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1520 states = counter_u64_fetch(state->rule.ptr->states_cur); 1521 } else { 1522 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1523 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1524 states = V_pf_status.states; 1525 } 1526 if (end && states > start && start < end) { 1527 if (states < end) 1528 return (state->expire + timeout * (end - states) / 1529 (end - start)); 1530 else 1531 return (time_uptime); 1532 } 1533 return (state->expire + timeout); 1534} 1535 1536void 1537pf_purge_expired_src_nodes() 1538{ 1539 struct pf_src_node_list freelist; 1540 struct pf_srchash *sh; 1541 struct pf_src_node *cur, *next; 1542 int i; 1543 1544 LIST_INIT(&freelist); 1545 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1546 PF_HASHROW_LOCK(sh); 1547 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1548 if (cur->states == 0 && cur->expire <= time_uptime) { 1549 pf_unlink_src_node(cur); 1550 LIST_INSERT_HEAD(&freelist, cur, entry); 1551 } else if (cur->rule.ptr != NULL) 1552 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1553 PF_HASHROW_UNLOCK(sh); 1554 } 1555 1556 pf_free_src_nodes(&freelist); 1557 1558 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 1559} 1560 1561static void 1562pf_src_tree_remove_state(struct pf_state *s) 1563{ 1564 struct pf_src_node *sn; 1565 struct pf_srchash *sh; 1566 uint32_t timeout; 1567 1568 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ? 1569 s->rule.ptr->timeout[PFTM_SRC_NODE] : 1570 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1571 1572 if (s->src_node != NULL) { 1573 sn = s->src_node; 1574 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1575 PF_HASHROW_LOCK(sh); 1576 if (s->src.tcp_est) 1577 --sn->conn; 1578 if (--sn->states == 0) 1579 sn->expire = time_uptime + timeout; 1580 PF_HASHROW_UNLOCK(sh); 1581 } 1582 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1583 sn = s->nat_src_node; 1584 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1585 PF_HASHROW_LOCK(sh); 1586 if (--sn->states == 0) 1587 sn->expire = time_uptime + timeout; 1588 PF_HASHROW_UNLOCK(sh); 1589 } 1590 s->src_node = s->nat_src_node = NULL; 1591} 1592 1593/* 1594 * Unlink and potentilly free a state. Function may be 1595 * called with ID hash row locked, but always returns 1596 * unlocked, since it needs to go through key hash locking. 1597 */ 1598int 1599pf_unlink_state(struct pf_state *s, u_int flags) 1600{ 1601 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1602 1603 if ((flags & PF_ENTER_LOCKED) == 0) 1604 PF_HASHROW_LOCK(ih); 1605 else 1606 PF_HASHROW_ASSERT(ih); 1607 1608 if (s->timeout == PFTM_UNLINKED) { 1609 /* 1610 * State is being processed 1611 * by pf_unlink_state() in 1612 * an other thread. 1613 */ 1614 PF_HASHROW_UNLOCK(ih); 1615 return (0); /* XXXGL: undefined actually */ 1616 } 1617 1618 if (s->src.state == PF_TCPS_PROXY_DST) { 1619 /* XXX wire key the right one? */ 1620 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1621 &s->key[PF_SK_WIRE]->addr[1], 1622 &s->key[PF_SK_WIRE]->addr[0], 1623 s->key[PF_SK_WIRE]->port[1], 1624 s->key[PF_SK_WIRE]->port[0], 1625 s->src.seqhi, s->src.seqlo + 1, 1626 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1627 } 1628 1629 LIST_REMOVE(s, entry); 1630 pf_src_tree_remove_state(s); 1631 1632 if (pfsync_delete_state_ptr != NULL) 1633 pfsync_delete_state_ptr(s); 1634 1635 STATE_DEC_COUNTERS(s); 1636 1637 s->timeout = PFTM_UNLINKED; 1638 1639 PF_HASHROW_UNLOCK(ih); 1640 1641 pf_detach_state(s); 1642 refcount_release(&s->refs); 1643 1644 return (pf_release_state(s)); 1645} 1646 1647void 1648pf_free_state(struct pf_state *cur) 1649{ 1650 1651 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1652 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1653 cur->timeout)); 1654 1655 pf_normalize_tcp_cleanup(cur); 1656 uma_zfree(V_pf_state_z, cur); 1657 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 1658} 1659 1660/* 1661 * Called only from pf_purge_thread(), thus serialized. 1662 */ 1663static u_int 1664pf_purge_expired_states(u_int i, int maxcheck) 1665{ 1666 struct pf_idhash *ih; 1667 struct pf_state *s; 1668 1669 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1670 1671 /* 1672 * Go through hash and unlink states that expire now. 1673 */ 1674 while (maxcheck > 0) { 1675 1676 ih = &V_pf_idhash[i]; 1677relock: 1678 PF_HASHROW_LOCK(ih); 1679 LIST_FOREACH(s, &ih->states, entry) { 1680 if (pf_state_expires(s) <= time_uptime) { 1681 V_pf_status.states -= 1682 pf_unlink_state(s, PF_ENTER_LOCKED); 1683 goto relock; 1684 } 1685 s->rule.ptr->rule_flag |= PFRULE_REFS; 1686 if (s->nat_rule.ptr != NULL) 1687 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1688 if (s->anchor.ptr != NULL) 1689 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1690 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1691 if (s->rt_kif) 1692 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1693 } 1694 PF_HASHROW_UNLOCK(ih); 1695 1696 /* Return when we hit end of hash. */ 1697 if (++i > pf_hashmask) { 1698 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1699 return (0); 1700 } 1701 1702 maxcheck--; 1703 } 1704 1705 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1706 1707 return (i); 1708} 1709 1710static void 1711pf_purge_unlinked_rules() 1712{ 1713 struct pf_rulequeue tmpq; 1714 struct pf_rule *r, *r1; 1715 1716 /* 1717 * If we have overloading task pending, then we'd 1718 * better skip purging this time. There is a tiny 1719 * probability that overloading task references 1720 * an already unlinked rule. 1721 */ 1722 PF_OVERLOADQ_LOCK(); 1723 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 1724 PF_OVERLOADQ_UNLOCK(); 1725 return; 1726 } 1727 PF_OVERLOADQ_UNLOCK(); 1728 1729 /* 1730 * Do naive mark-and-sweep garbage collecting of old rules. 1731 * Reference flag is raised by pf_purge_expired_states() 1732 * and pf_purge_expired_src_nodes(). 1733 * 1734 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1735 * use a temporary queue. 1736 */ 1737 TAILQ_INIT(&tmpq); 1738 PF_UNLNKDRULES_LOCK(); 1739 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1740 if (!(r->rule_flag & PFRULE_REFS)) { 1741 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1742 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1743 } else 1744 r->rule_flag &= ~PFRULE_REFS; 1745 } 1746 PF_UNLNKDRULES_UNLOCK(); 1747 1748 if (!TAILQ_EMPTY(&tmpq)) { 1749 PF_RULES_WLOCK(); 1750 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1751 TAILQ_REMOVE(&tmpq, r, entries); 1752 pf_free_rule(r); 1753 } 1754 PF_RULES_WUNLOCK(); 1755 } 1756} 1757 1758void 1759pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1760{ 1761 switch (af) { 1762#ifdef INET 1763 case AF_INET: { 1764 u_int32_t a = ntohl(addr->addr32[0]); 1765 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1766 (a>>8)&255, a&255); 1767 if (p) { 1768 p = ntohs(p); 1769 printf(":%u", p); 1770 } 1771 break; 1772 } 1773#endif /* INET */ 1774#ifdef INET6 1775 case AF_INET6: { 1776 u_int16_t b; 1777 u_int8_t i, curstart, curend, maxstart, maxend; 1778 curstart = curend = maxstart = maxend = 255; 1779 for (i = 0; i < 8; i++) { 1780 if (!addr->addr16[i]) { 1781 if (curstart == 255) 1782 curstart = i; 1783 curend = i; 1784 } else { 1785 if ((curend - curstart) > 1786 (maxend - maxstart)) { 1787 maxstart = curstart; 1788 maxend = curend; 1789 } 1790 curstart = curend = 255; 1791 } 1792 } 1793 if ((curend - curstart) > 1794 (maxend - maxstart)) { 1795 maxstart = curstart; 1796 maxend = curend; 1797 } 1798 for (i = 0; i < 8; i++) { 1799 if (i >= maxstart && i <= maxend) { 1800 if (i == 0) 1801 printf(":"); 1802 if (i == maxend) 1803 printf(":"); 1804 } else { 1805 b = ntohs(addr->addr16[i]); 1806 printf("%x", b); 1807 if (i < 7) 1808 printf(":"); 1809 } 1810 } 1811 if (p) { 1812 p = ntohs(p); 1813 printf("[%u]", p); 1814 } 1815 break; 1816 } 1817#endif /* INET6 */ 1818 } 1819} 1820 1821void 1822pf_print_state(struct pf_state *s) 1823{ 1824 pf_print_state_parts(s, NULL, NULL); 1825} 1826 1827static void 1828pf_print_state_parts(struct pf_state *s, 1829 struct pf_state_key *skwp, struct pf_state_key *sksp) 1830{ 1831 struct pf_state_key *skw, *sks; 1832 u_int8_t proto, dir; 1833 1834 /* Do our best to fill these, but they're skipped if NULL */ 1835 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1836 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1837 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1838 dir = s ? s->direction : 0; 1839 1840 switch (proto) { 1841 case IPPROTO_IPV4: 1842 printf("IPv4"); 1843 break; 1844 case IPPROTO_IPV6: 1845 printf("IPv6"); 1846 break; 1847 case IPPROTO_TCP: 1848 printf("TCP"); 1849 break; 1850 case IPPROTO_UDP: 1851 printf("UDP"); 1852 break; 1853 case IPPROTO_ICMP: 1854 printf("ICMP"); 1855 break; 1856 case IPPROTO_ICMPV6: 1857 printf("ICMPv6"); 1858 break; 1859 default: 1860 printf("%u", skw->proto); 1861 break; 1862 } 1863 switch (dir) { 1864 case PF_IN: 1865 printf(" in"); 1866 break; 1867 case PF_OUT: 1868 printf(" out"); 1869 break; 1870 } 1871 if (skw) { 1872 printf(" wire: "); 1873 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1874 printf(" "); 1875 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1876 } 1877 if (sks) { 1878 printf(" stack: "); 1879 if (sks != skw) { 1880 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1881 printf(" "); 1882 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1883 } else 1884 printf("-"); 1885 } 1886 if (s) { 1887 if (proto == IPPROTO_TCP) { 1888 printf(" [lo=%u high=%u win=%u modulator=%u", 1889 s->src.seqlo, s->src.seqhi, 1890 s->src.max_win, s->src.seqdiff); 1891 if (s->src.wscale && s->dst.wscale) 1892 printf(" wscale=%u", 1893 s->src.wscale & PF_WSCALE_MASK); 1894 printf("]"); 1895 printf(" [lo=%u high=%u win=%u modulator=%u", 1896 s->dst.seqlo, s->dst.seqhi, 1897 s->dst.max_win, s->dst.seqdiff); 1898 if (s->src.wscale && s->dst.wscale) 1899 printf(" wscale=%u", 1900 s->dst.wscale & PF_WSCALE_MASK); 1901 printf("]"); 1902 } 1903 printf(" %u:%u", s->src.state, s->dst.state); 1904 } 1905} 1906 1907void 1908pf_print_flags(u_int8_t f) 1909{ 1910 if (f) 1911 printf(" "); 1912 if (f & TH_FIN) 1913 printf("F"); 1914 if (f & TH_SYN) 1915 printf("S"); 1916 if (f & TH_RST) 1917 printf("R"); 1918 if (f & TH_PUSH) 1919 printf("P"); 1920 if (f & TH_ACK) 1921 printf("A"); 1922 if (f & TH_URG) 1923 printf("U"); 1924 if (f & TH_ECE) 1925 printf("E"); 1926 if (f & TH_CWR) 1927 printf("W"); 1928} 1929 1930#define PF_SET_SKIP_STEPS(i) \ 1931 do { \ 1932 while (head[i] != cur) { \ 1933 head[i]->skip[i].ptr = cur; \ 1934 head[i] = TAILQ_NEXT(head[i], entries); \ 1935 } \ 1936 } while (0) 1937 1938void 1939pf_calc_skip_steps(struct pf_rulequeue *rules) 1940{ 1941 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1942 int i; 1943 1944 cur = TAILQ_FIRST(rules); 1945 prev = cur; 1946 for (i = 0; i < PF_SKIP_COUNT; ++i) 1947 head[i] = cur; 1948 while (cur != NULL) { 1949 1950 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1951 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1952 if (cur->direction != prev->direction) 1953 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1954 if (cur->af != prev->af) 1955 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1956 if (cur->proto != prev->proto) 1957 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1958 if (cur->src.neg != prev->src.neg || 1959 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1960 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1961 if (cur->src.port[0] != prev->src.port[0] || 1962 cur->src.port[1] != prev->src.port[1] || 1963 cur->src.port_op != prev->src.port_op) 1964 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1965 if (cur->dst.neg != prev->dst.neg || 1966 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1967 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1968 if (cur->dst.port[0] != prev->dst.port[0] || 1969 cur->dst.port[1] != prev->dst.port[1] || 1970 cur->dst.port_op != prev->dst.port_op) 1971 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1972 1973 prev = cur; 1974 cur = TAILQ_NEXT(cur, entries); 1975 } 1976 for (i = 0; i < PF_SKIP_COUNT; ++i) 1977 PF_SET_SKIP_STEPS(i); 1978} 1979 1980static int 1981pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1982{ 1983 if (aw1->type != aw2->type) 1984 return (1); 1985 switch (aw1->type) { 1986 case PF_ADDR_ADDRMASK: 1987 case PF_ADDR_RANGE: 1988 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6)) 1989 return (1); 1990 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6)) 1991 return (1); 1992 return (0); 1993 case PF_ADDR_DYNIFTL: 1994 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1995 case PF_ADDR_NOROUTE: 1996 case PF_ADDR_URPFFAILED: 1997 return (0); 1998 case PF_ADDR_TABLE: 1999 return (aw1->p.tbl != aw2->p.tbl); 2000 default: 2001 printf("invalid address type: %d\n", aw1->type); 2002 return (1); 2003 } 2004} 2005 2006/** 2007 * Checksum updates are a little complicated because the checksum in the TCP/UDP 2008 * header isn't always a full checksum. In some cases (i.e. output) it's a 2009 * pseudo-header checksum, which is a partial checksum over src/dst IP 2010 * addresses, protocol number and length. 2011 * 2012 * That means we have the following cases: 2013 * * Input or forwarding: we don't have TSO, the checksum fields are full 2014 * checksums, we need to update the checksum whenever we change anything. 2015 * * Output (i.e. the checksum is a pseudo-header checksum): 2016 * x The field being updated is src/dst address or affects the length of 2017 * the packet. We need to update the pseudo-header checksum (note that this 2018 * checksum is not ones' complement). 2019 * x Some other field is being modified (e.g. src/dst port numbers): We 2020 * don't have to update anything. 2021 **/ 2022u_int16_t 2023pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2024{ 2025 u_int32_t l; 2026 2027 if (udp && !cksum) 2028 return (0x0000); 2029 l = cksum + old - new; 2030 l = (l >> 16) + (l & 65535); 2031 l = l & 65535; 2032 if (udp && !l) 2033 return (0xFFFF); 2034 return (l); 2035} 2036 2037u_int16_t 2038pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old, 2039 u_int16_t new, u_int8_t udp) 2040{ 2041 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2042 return (cksum); 2043 2044 return (pf_cksum_fixup(cksum, old, new, udp)); 2045} 2046 2047static void 2048pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic, 2049 u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, 2050 sa_family_t af) 2051{ 2052 struct pf_addr ao; 2053 u_int16_t po = *p; 2054 2055 PF_ACPY(&ao, a, af); 2056 PF_ACPY(a, an, af); 2057 2058 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2059 *pc = ~*pc; 2060 2061 *p = pn; 2062 2063 switch (af) { 2064#ifdef INET 2065 case AF_INET: 2066 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2067 ao.addr16[0], an->addr16[0], 0), 2068 ao.addr16[1], an->addr16[1], 0); 2069 *p = pn; 2070 2071 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc, 2072 ao.addr16[0], an->addr16[0], u), 2073 ao.addr16[1], an->addr16[1], u); 2074 2075 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2076 break; 2077#endif /* INET */ 2078#ifdef INET6 2079 case AF_INET6: 2080 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2081 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2082 pf_cksum_fixup(pf_cksum_fixup(*pc, 2083 ao.addr16[0], an->addr16[0], u), 2084 ao.addr16[1], an->addr16[1], u), 2085 ao.addr16[2], an->addr16[2], u), 2086 ao.addr16[3], an->addr16[3], u), 2087 ao.addr16[4], an->addr16[4], u), 2088 ao.addr16[5], an->addr16[5], u), 2089 ao.addr16[6], an->addr16[6], u), 2090 ao.addr16[7], an->addr16[7], u); 2091 2092 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2093 break; 2094#endif /* INET6 */ 2095 } 2096 2097 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | 2098 CSUM_DELAY_DATA_IPV6)) { 2099 *pc = ~*pc; 2100 if (! *pc) 2101 *pc = 0xffff; 2102 } 2103} 2104 2105/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2106void 2107pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2108{ 2109 u_int32_t ao; 2110 2111 memcpy(&ao, a, sizeof(ao)); 2112 memcpy(a, &an, sizeof(u_int32_t)); 2113 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2114 ao % 65536, an % 65536, u); 2115} 2116 2117void 2118pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp) 2119{ 2120 u_int32_t ao; 2121 2122 memcpy(&ao, a, sizeof(ao)); 2123 memcpy(a, &an, sizeof(u_int32_t)); 2124 2125 *c = pf_proto_cksum_fixup(m, 2126 pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp), 2127 ao % 65536, an % 65536, udp); 2128} 2129 2130#ifdef INET6 2131static void 2132pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2133{ 2134 struct pf_addr ao; 2135 2136 PF_ACPY(&ao, a, AF_INET6); 2137 PF_ACPY(a, an, AF_INET6); 2138 2139 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2140 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2141 pf_cksum_fixup(pf_cksum_fixup(*c, 2142 ao.addr16[0], an->addr16[0], u), 2143 ao.addr16[1], an->addr16[1], u), 2144 ao.addr16[2], an->addr16[2], u), 2145 ao.addr16[3], an->addr16[3], u), 2146 ao.addr16[4], an->addr16[4], u), 2147 ao.addr16[5], an->addr16[5], u), 2148 ao.addr16[6], an->addr16[6], u), 2149 ao.addr16[7], an->addr16[7], u); 2150} 2151#endif /* INET6 */ 2152 2153static void 2154pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2155 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2156 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2157{ 2158 struct pf_addr oia, ooa; 2159 2160 PF_ACPY(&oia, ia, af); 2161 if (oa) 2162 PF_ACPY(&ooa, oa, af); 2163 2164 /* Change inner protocol port, fix inner protocol checksum. */ 2165 if (ip != NULL) { 2166 u_int16_t oip = *ip; 2167 u_int32_t opc; 2168 2169 if (pc != NULL) 2170 opc = *pc; 2171 *ip = np; 2172 if (pc != NULL) 2173 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2174 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2175 if (pc != NULL) 2176 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2177 } 2178 /* Change inner ip address, fix inner ip and icmp checksums. */ 2179 PF_ACPY(ia, na, af); 2180 switch (af) { 2181#ifdef INET 2182 case AF_INET: { 2183 u_int32_t oh2c = *h2c; 2184 2185 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2186 oia.addr16[0], ia->addr16[0], 0), 2187 oia.addr16[1], ia->addr16[1], 0); 2188 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2189 oia.addr16[0], ia->addr16[0], 0), 2190 oia.addr16[1], ia->addr16[1], 0); 2191 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2192 break; 2193 } 2194#endif /* INET */ 2195#ifdef INET6 2196 case AF_INET6: 2197 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2198 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2199 pf_cksum_fixup(pf_cksum_fixup(*ic, 2200 oia.addr16[0], ia->addr16[0], u), 2201 oia.addr16[1], ia->addr16[1], u), 2202 oia.addr16[2], ia->addr16[2], u), 2203 oia.addr16[3], ia->addr16[3], u), 2204 oia.addr16[4], ia->addr16[4], u), 2205 oia.addr16[5], ia->addr16[5], u), 2206 oia.addr16[6], ia->addr16[6], u), 2207 oia.addr16[7], ia->addr16[7], u); 2208 break; 2209#endif /* INET6 */ 2210 } 2211 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2212 if (oa) { 2213 PF_ACPY(oa, na, af); 2214 switch (af) { 2215#ifdef INET 2216 case AF_INET: 2217 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2218 ooa.addr16[0], oa->addr16[0], 0), 2219 ooa.addr16[1], oa->addr16[1], 0); 2220 break; 2221#endif /* INET */ 2222#ifdef INET6 2223 case AF_INET6: 2224 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2225 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2226 pf_cksum_fixup(pf_cksum_fixup(*ic, 2227 ooa.addr16[0], oa->addr16[0], u), 2228 ooa.addr16[1], oa->addr16[1], u), 2229 ooa.addr16[2], oa->addr16[2], u), 2230 ooa.addr16[3], oa->addr16[3], u), 2231 ooa.addr16[4], oa->addr16[4], u), 2232 ooa.addr16[5], oa->addr16[5], u), 2233 ooa.addr16[6], oa->addr16[6], u), 2234 ooa.addr16[7], oa->addr16[7], u); 2235 break; 2236#endif /* INET6 */ 2237 } 2238 } 2239} 2240 2241 2242/* 2243 * Need to modulate the sequence numbers in the TCP SACK option 2244 * (credits to Krzysztof Pfaff for report and patch) 2245 */ 2246static int 2247pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2248 struct tcphdr *th, struct pf_state_peer *dst) 2249{ 2250 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2251 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2252 int copyback = 0, i, olen; 2253 struct sackblk sack; 2254 2255#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2256 if (hlen < TCPOLEN_SACKLEN || 2257 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2258 return 0; 2259 2260 while (hlen >= TCPOLEN_SACKLEN) { 2261 olen = opt[1]; 2262 switch (*opt) { 2263 case TCPOPT_EOL: /* FALLTHROUGH */ 2264 case TCPOPT_NOP: 2265 opt++; 2266 hlen--; 2267 break; 2268 case TCPOPT_SACK: 2269 if (olen > hlen) 2270 olen = hlen; 2271 if (olen >= TCPOLEN_SACKLEN) { 2272 for (i = 2; i + TCPOLEN_SACK <= olen; 2273 i += TCPOLEN_SACK) { 2274 memcpy(&sack, &opt[i], sizeof(sack)); 2275 pf_change_proto_a(m, &sack.start, &th->th_sum, 2276 htonl(ntohl(sack.start) - dst->seqdiff), 0); 2277 pf_change_proto_a(m, &sack.end, &th->th_sum, 2278 htonl(ntohl(sack.end) - dst->seqdiff), 0); 2279 memcpy(&opt[i], &sack, sizeof(sack)); 2280 } 2281 copyback = 1; 2282 } 2283 /* FALLTHROUGH */ 2284 default: 2285 if (olen < 2) 2286 olen = 2; 2287 hlen -= olen; 2288 opt += olen; 2289 } 2290 } 2291 2292 if (copyback) 2293 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2294 return (copyback); 2295} 2296 2297static void 2298pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2299 const struct pf_addr *saddr, const struct pf_addr *daddr, 2300 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2301 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2302 u_int16_t rtag, struct ifnet *ifp) 2303{ 2304 struct pf_send_entry *pfse; 2305 struct mbuf *m; 2306 int len, tlen; 2307#ifdef INET 2308 struct ip *h = NULL; 2309#endif /* INET */ 2310#ifdef INET6 2311 struct ip6_hdr *h6 = NULL; 2312#endif /* INET6 */ 2313 struct tcphdr *th; 2314 char *opt; 2315 struct pf_mtag *pf_mtag; 2316 2317 len = 0; 2318 th = NULL; 2319 2320 /* maximum segment size tcp option */ 2321 tlen = sizeof(struct tcphdr); 2322 if (mss) 2323 tlen += 4; 2324 2325 switch (af) { 2326#ifdef INET 2327 case AF_INET: 2328 len = sizeof(struct ip) + tlen; 2329 break; 2330#endif /* INET */ 2331#ifdef INET6 2332 case AF_INET6: 2333 len = sizeof(struct ip6_hdr) + tlen; 2334 break; 2335#endif /* INET6 */ 2336 default: 2337 panic("%s: unsupported af %d", __func__, af); 2338 } 2339 2340 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2341 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2342 if (pfse == NULL) 2343 return; 2344 m = m_gethdr(M_NOWAIT, MT_DATA); 2345 if (m == NULL) { 2346 free(pfse, M_PFTEMP); 2347 return; 2348 } 2349#ifdef MAC 2350 mac_netinet_firewall_send(m); 2351#endif 2352 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2353 free(pfse, M_PFTEMP); 2354 m_freem(m); 2355 return; 2356 } 2357 if (tag) 2358 m->m_flags |= M_SKIP_FIREWALL; 2359 pf_mtag->tag = rtag; 2360 2361 if (r != NULL && r->rtableid >= 0) 2362 M_SETFIB(m, r->rtableid); 2363 2364#ifdef ALTQ 2365 if (r != NULL && r->qid) { 2366 pf_mtag->qid = r->qid; 2367 2368 /* add hints for ecn */ 2369 pf_mtag->hdr = mtod(m, struct ip *); 2370 } 2371#endif /* ALTQ */ 2372 m->m_data += max_linkhdr; 2373 m->m_pkthdr.len = m->m_len = len; 2374 m->m_pkthdr.rcvif = NULL; 2375 bzero(m->m_data, len); 2376 switch (af) { 2377#ifdef INET 2378 case AF_INET: 2379 h = mtod(m, struct ip *); 2380 2381 /* IP header fields included in the TCP checksum */ 2382 h->ip_p = IPPROTO_TCP; 2383 h->ip_len = htons(tlen); 2384 h->ip_src.s_addr = saddr->v4.s_addr; 2385 h->ip_dst.s_addr = daddr->v4.s_addr; 2386 2387 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2388 break; 2389#endif /* INET */ 2390#ifdef INET6 2391 case AF_INET6: 2392 h6 = mtod(m, struct ip6_hdr *); 2393 2394 /* IP header fields included in the TCP checksum */ 2395 h6->ip6_nxt = IPPROTO_TCP; 2396 h6->ip6_plen = htons(tlen); 2397 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2398 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2399 2400 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2401 break; 2402#endif /* INET6 */ 2403 } 2404 2405 /* TCP header */ 2406 th->th_sport = sport; 2407 th->th_dport = dport; 2408 th->th_seq = htonl(seq); 2409 th->th_ack = htonl(ack); 2410 th->th_off = tlen >> 2; 2411 th->th_flags = flags; 2412 th->th_win = htons(win); 2413 2414 if (mss) { 2415 opt = (char *)(th + 1); 2416 opt[0] = TCPOPT_MAXSEG; 2417 opt[1] = 4; 2418 HTONS(mss); 2419 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2420 } 2421 2422 switch (af) { 2423#ifdef INET 2424 case AF_INET: 2425 /* TCP checksum */ 2426 th->th_sum = in_cksum(m, len); 2427 2428 /* Finish the IP header */ 2429 h->ip_v = 4; 2430 h->ip_hl = sizeof(*h) >> 2; 2431 h->ip_tos = IPTOS_LOWDELAY; 2432 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2433 h->ip_len = htons(len); 2434 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2435 h->ip_sum = 0; 2436 2437 pfse->pfse_type = PFSE_IP; 2438 break; 2439#endif /* INET */ 2440#ifdef INET6 2441 case AF_INET6: 2442 /* TCP checksum */ 2443 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2444 sizeof(struct ip6_hdr), tlen); 2445 2446 h6->ip6_vfc |= IPV6_VERSION; 2447 h6->ip6_hlim = IPV6_DEFHLIM; 2448 2449 pfse->pfse_type = PFSE_IP6; 2450 break; 2451#endif /* INET6 */ 2452 } 2453 pfse->pfse_m = m; 2454 pf_send(pfse); 2455} 2456 2457static void 2458pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2459 struct pf_rule *r) 2460{ 2461 struct pf_send_entry *pfse; 2462 struct mbuf *m0; 2463 struct pf_mtag *pf_mtag; 2464 2465 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2466 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2467 if (pfse == NULL) 2468 return; 2469 2470 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2471 free(pfse, M_PFTEMP); 2472 return; 2473 } 2474 2475 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2476 free(pfse, M_PFTEMP); 2477 return; 2478 } 2479 /* XXX: revisit */ 2480 m0->m_flags |= M_SKIP_FIREWALL; 2481 2482 if (r->rtableid >= 0) 2483 M_SETFIB(m0, r->rtableid); 2484 2485#ifdef ALTQ 2486 if (r->qid) { 2487 pf_mtag->qid = r->qid; 2488 /* add hints for ecn */ 2489 pf_mtag->hdr = mtod(m0, struct ip *); 2490 } 2491#endif /* ALTQ */ 2492 2493 switch (af) { 2494#ifdef INET 2495 case AF_INET: 2496 pfse->pfse_type = PFSE_ICMP; 2497 break; 2498#endif /* INET */ 2499#ifdef INET6 2500 case AF_INET6: 2501 pfse->pfse_type = PFSE_ICMP6; 2502 break; 2503#endif /* INET6 */ 2504 } 2505 pfse->pfse_m = m0; 2506 pfse->pfse_icmp_type = type; 2507 pfse->pfse_icmp_code = code; 2508 pf_send(pfse); 2509} 2510 2511/* 2512 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2513 * If n is 0, they match if they are equal. If n is != 0, they match if they 2514 * are different. 2515 */ 2516int 2517pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2518 struct pf_addr *b, sa_family_t af) 2519{ 2520 int match = 0; 2521 2522 switch (af) { 2523#ifdef INET 2524 case AF_INET: 2525 if ((a->addr32[0] & m->addr32[0]) == 2526 (b->addr32[0] & m->addr32[0])) 2527 match++; 2528 break; 2529#endif /* INET */ 2530#ifdef INET6 2531 case AF_INET6: 2532 if (((a->addr32[0] & m->addr32[0]) == 2533 (b->addr32[0] & m->addr32[0])) && 2534 ((a->addr32[1] & m->addr32[1]) == 2535 (b->addr32[1] & m->addr32[1])) && 2536 ((a->addr32[2] & m->addr32[2]) == 2537 (b->addr32[2] & m->addr32[2])) && 2538 ((a->addr32[3] & m->addr32[3]) == 2539 (b->addr32[3] & m->addr32[3]))) 2540 match++; 2541 break; 2542#endif /* INET6 */ 2543 } 2544 if (match) { 2545 if (n) 2546 return (0); 2547 else 2548 return (1); 2549 } else { 2550 if (n) 2551 return (1); 2552 else 2553 return (0); 2554 } 2555} 2556 2557/* 2558 * Return 1 if b <= a <= e, otherwise return 0. 2559 */ 2560int 2561pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2562 struct pf_addr *a, sa_family_t af) 2563{ 2564 switch (af) { 2565#ifdef INET 2566 case AF_INET: 2567 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) || 2568 (ntohl(a->addr32[0]) > ntohl(e->addr32[0]))) 2569 return (0); 2570 break; 2571#endif /* INET */ 2572#ifdef INET6 2573 case AF_INET6: { 2574 int i; 2575 2576 /* check a >= b */ 2577 for (i = 0; i < 4; ++i) 2578 if (ntohl(a->addr32[i]) > ntohl(b->addr32[i])) 2579 break; 2580 else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i])) 2581 return (0); 2582 /* check a <= e */ 2583 for (i = 0; i < 4; ++i) 2584 if (ntohl(a->addr32[i]) < ntohl(e->addr32[i])) 2585 break; 2586 else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i])) 2587 return (0); 2588 break; 2589 } 2590#endif /* INET6 */ 2591 } 2592 return (1); 2593} 2594 2595static int 2596pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2597{ 2598 switch (op) { 2599 case PF_OP_IRG: 2600 return ((p > a1) && (p < a2)); 2601 case PF_OP_XRG: 2602 return ((p < a1) || (p > a2)); 2603 case PF_OP_RRG: 2604 return ((p >= a1) && (p <= a2)); 2605 case PF_OP_EQ: 2606 return (p == a1); 2607 case PF_OP_NE: 2608 return (p != a1); 2609 case PF_OP_LT: 2610 return (p < a1); 2611 case PF_OP_LE: 2612 return (p <= a1); 2613 case PF_OP_GT: 2614 return (p > a1); 2615 case PF_OP_GE: 2616 return (p >= a1); 2617 } 2618 return (0); /* never reached */ 2619} 2620 2621int 2622pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2623{ 2624 NTOHS(a1); 2625 NTOHS(a2); 2626 NTOHS(p); 2627 return (pf_match(op, a1, a2, p)); 2628} 2629 2630static int 2631pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2632{ 2633 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2634 return (0); 2635 return (pf_match(op, a1, a2, u)); 2636} 2637 2638static int 2639pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2640{ 2641 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2642 return (0); 2643 return (pf_match(op, a1, a2, g)); 2644} 2645 2646int 2647pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2648{ 2649 if (*tag == -1) 2650 *tag = mtag; 2651 2652 return ((!r->match_tag_not && r->match_tag == *tag) || 2653 (r->match_tag_not && r->match_tag != *tag)); 2654} 2655 2656int 2657pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2658{ 2659 2660 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2661 2662 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2663 return (ENOMEM); 2664 2665 pd->pf_mtag->tag = tag; 2666 2667 return (0); 2668} 2669 2670#define PF_ANCHOR_STACKSIZE 32 2671struct pf_anchor_stackframe { 2672 struct pf_ruleset *rs; 2673 struct pf_rule *r; /* XXX: + match bit */ 2674 struct pf_anchor *child; 2675}; 2676 2677/* 2678 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2679 */ 2680#define PF_ANCHORSTACK_MATCH 0x00000001 2681#define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2682 2683#define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2684#define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2685 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2686#define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2687 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2688} while (0) 2689 2690void 2691pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2692 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2693 int *match) 2694{ 2695 struct pf_anchor_stackframe *f; 2696 2697 PF_RULES_RASSERT(); 2698 2699 if (match) 2700 *match = 0; 2701 if (*depth >= PF_ANCHOR_STACKSIZE) { 2702 printf("%s: anchor stack overflow on %s\n", 2703 __func__, (*r)->anchor->name); 2704 *r = TAILQ_NEXT(*r, entries); 2705 return; 2706 } else if (*depth == 0 && a != NULL) 2707 *a = *r; 2708 f = stack + (*depth)++; 2709 f->rs = *rs; 2710 f->r = *r; 2711 if ((*r)->anchor_wildcard) { 2712 struct pf_anchor_node *parent = &(*r)->anchor->children; 2713 2714 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2715 *r = NULL; 2716 return; 2717 } 2718 *rs = &f->child->ruleset; 2719 } else { 2720 f->child = NULL; 2721 *rs = &(*r)->anchor->ruleset; 2722 } 2723 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2724} 2725 2726int 2727pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2728 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2729 int *match) 2730{ 2731 struct pf_anchor_stackframe *f; 2732 struct pf_rule *fr; 2733 int quick = 0; 2734 2735 PF_RULES_RASSERT(); 2736 2737 do { 2738 if (*depth <= 0) 2739 break; 2740 f = stack + *depth - 1; 2741 fr = PF_ANCHOR_RULE(f); 2742 if (f->child != NULL) { 2743 struct pf_anchor_node *parent; 2744 2745 /* 2746 * This block traverses through 2747 * a wildcard anchor. 2748 */ 2749 parent = &fr->anchor->children; 2750 if (match != NULL && *match) { 2751 /* 2752 * If any of "*" matched, then 2753 * "foo/ *" matched, mark frame 2754 * appropriately. 2755 */ 2756 PF_ANCHOR_SET_MATCH(f); 2757 *match = 0; 2758 } 2759 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2760 if (f->child != NULL) { 2761 *rs = &f->child->ruleset; 2762 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2763 if (*r == NULL) 2764 continue; 2765 else 2766 break; 2767 } 2768 } 2769 (*depth)--; 2770 if (*depth == 0 && a != NULL) 2771 *a = NULL; 2772 *rs = f->rs; 2773 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 2774 quick = fr->quick; 2775 *r = TAILQ_NEXT(fr, entries); 2776 } while (*r == NULL); 2777 2778 return (quick); 2779} 2780 2781#ifdef INET6 2782void 2783pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2784 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2785{ 2786 switch (af) { 2787#ifdef INET 2788 case AF_INET: 2789 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2790 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2791 break; 2792#endif /* INET */ 2793 case AF_INET6: 2794 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2795 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2796 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2797 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2798 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2799 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2800 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2801 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2802 break; 2803 } 2804} 2805 2806void 2807pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2808{ 2809 switch (af) { 2810#ifdef INET 2811 case AF_INET: 2812 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2813 break; 2814#endif /* INET */ 2815 case AF_INET6: 2816 if (addr->addr32[3] == 0xffffffff) { 2817 addr->addr32[3] = 0; 2818 if (addr->addr32[2] == 0xffffffff) { 2819 addr->addr32[2] = 0; 2820 if (addr->addr32[1] == 0xffffffff) { 2821 addr->addr32[1] = 0; 2822 addr->addr32[0] = 2823 htonl(ntohl(addr->addr32[0]) + 1); 2824 } else 2825 addr->addr32[1] = 2826 htonl(ntohl(addr->addr32[1]) + 1); 2827 } else 2828 addr->addr32[2] = 2829 htonl(ntohl(addr->addr32[2]) + 1); 2830 } else 2831 addr->addr32[3] = 2832 htonl(ntohl(addr->addr32[3]) + 1); 2833 break; 2834 } 2835} 2836#endif /* INET6 */ 2837 2838int 2839pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2840{ 2841 struct pf_addr *saddr, *daddr; 2842 u_int16_t sport, dport; 2843 struct inpcbinfo *pi; 2844 struct inpcb *inp; 2845 2846 pd->lookup.uid = UID_MAX; 2847 pd->lookup.gid = GID_MAX; 2848 2849 switch (pd->proto) { 2850 case IPPROTO_TCP: 2851 if (pd->hdr.tcp == NULL) 2852 return (-1); 2853 sport = pd->hdr.tcp->th_sport; 2854 dport = pd->hdr.tcp->th_dport; 2855 pi = &V_tcbinfo; 2856 break; 2857 case IPPROTO_UDP: 2858 if (pd->hdr.udp == NULL) 2859 return (-1); 2860 sport = pd->hdr.udp->uh_sport; 2861 dport = pd->hdr.udp->uh_dport; 2862 pi = &V_udbinfo; 2863 break; 2864 default: 2865 return (-1); 2866 } 2867 if (direction == PF_IN) { 2868 saddr = pd->src; 2869 daddr = pd->dst; 2870 } else { 2871 u_int16_t p; 2872 2873 p = sport; 2874 sport = dport; 2875 dport = p; 2876 saddr = pd->dst; 2877 daddr = pd->src; 2878 } 2879 switch (pd->af) { 2880#ifdef INET 2881 case AF_INET: 2882 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2883 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2884 if (inp == NULL) { 2885 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2886 daddr->v4, dport, INPLOOKUP_WILDCARD | 2887 INPLOOKUP_RLOCKPCB, NULL, m); 2888 if (inp == NULL) 2889 return (-1); 2890 } 2891 break; 2892#endif /* INET */ 2893#ifdef INET6 2894 case AF_INET6: 2895 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2896 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2897 if (inp == NULL) { 2898 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2899 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2900 INPLOOKUP_RLOCKPCB, NULL, m); 2901 if (inp == NULL) 2902 return (-1); 2903 } 2904 break; 2905#endif /* INET6 */ 2906 2907 default: 2908 return (-1); 2909 } 2910 INP_RLOCK_ASSERT(inp); 2911 pd->lookup.uid = inp->inp_cred->cr_uid; 2912 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2913 INP_RUNLOCK(inp); 2914 2915 return (1); 2916} 2917 2918static u_int8_t 2919pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2920{ 2921 int hlen; 2922 u_int8_t hdr[60]; 2923 u_int8_t *opt, optlen; 2924 u_int8_t wscale = 0; 2925 2926 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2927 if (hlen <= sizeof(struct tcphdr)) 2928 return (0); 2929 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2930 return (0); 2931 opt = hdr + sizeof(struct tcphdr); 2932 hlen -= sizeof(struct tcphdr); 2933 while (hlen >= 3) { 2934 switch (*opt) { 2935 case TCPOPT_EOL: 2936 case TCPOPT_NOP: 2937 ++opt; 2938 --hlen; 2939 break; 2940 case TCPOPT_WINDOW: 2941 wscale = opt[2]; 2942 if (wscale > TCP_MAX_WINSHIFT) 2943 wscale = TCP_MAX_WINSHIFT; 2944 wscale |= PF_WSCALE_FLAG; 2945 /* FALLTHROUGH */ 2946 default: 2947 optlen = opt[1]; 2948 if (optlen < 2) 2949 optlen = 2; 2950 hlen -= optlen; 2951 opt += optlen; 2952 break; 2953 } 2954 } 2955 return (wscale); 2956} 2957 2958static u_int16_t 2959pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2960{ 2961 int hlen; 2962 u_int8_t hdr[60]; 2963 u_int8_t *opt, optlen; 2964 u_int16_t mss = V_tcp_mssdflt; 2965 2966 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2967 if (hlen <= sizeof(struct tcphdr)) 2968 return (0); 2969 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2970 return (0); 2971 opt = hdr + sizeof(struct tcphdr); 2972 hlen -= sizeof(struct tcphdr); 2973 while (hlen >= TCPOLEN_MAXSEG) { 2974 switch (*opt) { 2975 case TCPOPT_EOL: 2976 case TCPOPT_NOP: 2977 ++opt; 2978 --hlen; 2979 break; 2980 case TCPOPT_MAXSEG: 2981 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2982 NTOHS(mss); 2983 /* FALLTHROUGH */ 2984 default: 2985 optlen = opt[1]; 2986 if (optlen < 2) 2987 optlen = 2; 2988 hlen -= optlen; 2989 opt += optlen; 2990 break; 2991 } 2992 } 2993 return (mss); 2994} 2995 2996static u_int16_t 2997pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 2998{ 2999#ifdef INET 3000 struct sockaddr_in *dst; 3001 struct route ro; 3002#endif /* INET */ 3003#ifdef INET6 3004 struct sockaddr_in6 *dst6; 3005 struct route_in6 ro6; 3006#endif /* INET6 */ 3007 struct rtentry *rt = NULL; 3008 int hlen = 0; 3009 u_int16_t mss = V_tcp_mssdflt; 3010 3011 switch (af) { 3012#ifdef INET 3013 case AF_INET: 3014 hlen = sizeof(struct ip); 3015 bzero(&ro, sizeof(ro)); 3016 dst = (struct sockaddr_in *)&ro.ro_dst; 3017 dst->sin_family = AF_INET; 3018 dst->sin_len = sizeof(*dst); 3019 dst->sin_addr = addr->v4; 3020 in_rtalloc_ign(&ro, 0, rtableid); 3021 rt = ro.ro_rt; 3022 break; 3023#endif /* INET */ 3024#ifdef INET6 3025 case AF_INET6: 3026 hlen = sizeof(struct ip6_hdr); 3027 bzero(&ro6, sizeof(ro6)); 3028 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3029 dst6->sin6_family = AF_INET6; 3030 dst6->sin6_len = sizeof(*dst6); 3031 dst6->sin6_addr = addr->v6; 3032 in6_rtalloc_ign(&ro6, 0, rtableid); 3033 rt = ro6.ro_rt; 3034 break; 3035#endif /* INET6 */ 3036 } 3037 3038 if (rt && rt->rt_ifp) { 3039 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3040 mss = max(V_tcp_mssdflt, mss); 3041 RTFREE(rt); 3042 } 3043 mss = min(mss, offer); 3044 mss = max(mss, 64); /* sanity - at least max opt space */ 3045 return (mss); 3046} 3047 3048static u_int32_t 3049pf_tcp_iss(struct pf_pdesc *pd) 3050{ 3051 MD5_CTX ctx; 3052 u_int32_t digest[4]; 3053 3054 if (V_pf_tcp_secret_init == 0) { 3055 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 3056 MD5Init(&V_pf_tcp_secret_ctx); 3057 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 3058 sizeof(V_pf_tcp_secret)); 3059 V_pf_tcp_secret_init = 1; 3060 } 3061 3062 ctx = V_pf_tcp_secret_ctx; 3063 3064 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3065 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3066 if (pd->af == AF_INET6) { 3067 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3068 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3069 } else { 3070 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3071 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3072 } 3073 MD5Final((u_char *)digest, &ctx); 3074 V_pf_tcp_iss_off += 4096; 3075#define ISN_RANDOM_INCREMENT (4096 - 1) 3076 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 3077 V_pf_tcp_iss_off); 3078#undef ISN_RANDOM_INCREMENT 3079} 3080 3081static int 3082pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3083 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 3084 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 3085{ 3086 struct pf_rule *nr = NULL; 3087 struct pf_addr * const saddr = pd->src; 3088 struct pf_addr * const daddr = pd->dst; 3089 sa_family_t af = pd->af; 3090 struct pf_rule *r, *a = NULL; 3091 struct pf_ruleset *ruleset = NULL; 3092 struct pf_src_node *nsn = NULL; 3093 struct tcphdr *th = pd->hdr.tcp; 3094 struct pf_state_key *sk = NULL, *nk = NULL; 3095 u_short reason; 3096 int rewrite = 0, hdrlen = 0; 3097 int tag = -1, rtableid = -1; 3098 int asd = 0; 3099 int match = 0; 3100 int state_icmp = 0; 3101 u_int16_t sport = 0, dport = 0; 3102 u_int16_t bproto_sum = 0, bip_sum = 0; 3103 u_int8_t icmptype = 0, icmpcode = 0; 3104 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3105 3106 PF_RULES_RASSERT(); 3107 3108 if (inp != NULL) { 3109 INP_LOCK_ASSERT(inp); 3110 pd->lookup.uid = inp->inp_cred->cr_uid; 3111 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3112 pd->lookup.done = 1; 3113 } 3114 3115 switch (pd->proto) { 3116 case IPPROTO_TCP: 3117 sport = th->th_sport; 3118 dport = th->th_dport; 3119 hdrlen = sizeof(*th); 3120 break; 3121 case IPPROTO_UDP: 3122 sport = pd->hdr.udp->uh_sport; 3123 dport = pd->hdr.udp->uh_dport; 3124 hdrlen = sizeof(*pd->hdr.udp); 3125 break; 3126#ifdef INET 3127 case IPPROTO_ICMP: 3128 if (pd->af != AF_INET) 3129 break; 3130 sport = dport = pd->hdr.icmp->icmp_id; 3131 hdrlen = sizeof(*pd->hdr.icmp); 3132 icmptype = pd->hdr.icmp->icmp_type; 3133 icmpcode = pd->hdr.icmp->icmp_code; 3134 3135 if (icmptype == ICMP_UNREACH || 3136 icmptype == ICMP_SOURCEQUENCH || 3137 icmptype == ICMP_REDIRECT || 3138 icmptype == ICMP_TIMXCEED || 3139 icmptype == ICMP_PARAMPROB) 3140 state_icmp++; 3141 break; 3142#endif /* INET */ 3143#ifdef INET6 3144 case IPPROTO_ICMPV6: 3145 if (af != AF_INET6) 3146 break; 3147 sport = dport = pd->hdr.icmp6->icmp6_id; 3148 hdrlen = sizeof(*pd->hdr.icmp6); 3149 icmptype = pd->hdr.icmp6->icmp6_type; 3150 icmpcode = pd->hdr.icmp6->icmp6_code; 3151 3152 if (icmptype == ICMP6_DST_UNREACH || 3153 icmptype == ICMP6_PACKET_TOO_BIG || 3154 icmptype == ICMP6_TIME_EXCEEDED || 3155 icmptype == ICMP6_PARAM_PROB) 3156 state_icmp++; 3157 break; 3158#endif /* INET6 */ 3159 default: 3160 sport = dport = hdrlen = 0; 3161 break; 3162 } 3163 3164 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3165 3166 /* check packet for BINAT/NAT/RDR */ 3167 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3168 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3169 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3170 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3171 3172 if (pd->ip_sum) 3173 bip_sum = *pd->ip_sum; 3174 3175 switch (pd->proto) { 3176 case IPPROTO_TCP: 3177 bproto_sum = th->th_sum; 3178 pd->proto_sum = &th->th_sum; 3179 3180 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3181 nk->port[pd->sidx] != sport) { 3182 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum, 3183 &th->th_sum, &nk->addr[pd->sidx], 3184 nk->port[pd->sidx], 0, af); 3185 pd->sport = &th->th_sport; 3186 sport = th->th_sport; 3187 } 3188 3189 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3190 nk->port[pd->didx] != dport) { 3191 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum, 3192 &th->th_sum, &nk->addr[pd->didx], 3193 nk->port[pd->didx], 0, af); 3194 dport = th->th_dport; 3195 pd->dport = &th->th_dport; 3196 } 3197 rewrite++; 3198 break; 3199 case IPPROTO_UDP: 3200 bproto_sum = pd->hdr.udp->uh_sum; 3201 pd->proto_sum = &pd->hdr.udp->uh_sum; 3202 3203 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3204 nk->port[pd->sidx] != sport) { 3205 pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport, 3206 pd->ip_sum, &pd->hdr.udp->uh_sum, 3207 &nk->addr[pd->sidx], 3208 nk->port[pd->sidx], 1, af); 3209 sport = pd->hdr.udp->uh_sport; 3210 pd->sport = &pd->hdr.udp->uh_sport; 3211 } 3212 3213 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3214 nk->port[pd->didx] != dport) { 3215 pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport, 3216 pd->ip_sum, &pd->hdr.udp->uh_sum, 3217 &nk->addr[pd->didx], 3218 nk->port[pd->didx], 1, af); 3219 dport = pd->hdr.udp->uh_dport; 3220 pd->dport = &pd->hdr.udp->uh_dport; 3221 } 3222 rewrite++; 3223 break; 3224#ifdef INET 3225 case IPPROTO_ICMP: 3226 nk->port[0] = nk->port[1]; 3227 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3228 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3229 nk->addr[pd->sidx].v4.s_addr, 0); 3230 3231 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3232 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3233 nk->addr[pd->didx].v4.s_addr, 0); 3234 3235 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3236 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3237 pd->hdr.icmp->icmp_cksum, sport, 3238 nk->port[1], 0); 3239 pd->hdr.icmp->icmp_id = nk->port[1]; 3240 pd->sport = &pd->hdr.icmp->icmp_id; 3241 } 3242 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3243 break; 3244#endif /* INET */ 3245#ifdef INET6 3246 case IPPROTO_ICMPV6: 3247 nk->port[0] = nk->port[1]; 3248 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3249 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3250 &nk->addr[pd->sidx], 0); 3251 3252 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3253 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3254 &nk->addr[pd->didx], 0); 3255 rewrite++; 3256 break; 3257#endif /* INET */ 3258 default: 3259 switch (af) { 3260#ifdef INET 3261 case AF_INET: 3262 if (PF_ANEQ(saddr, 3263 &nk->addr[pd->sidx], AF_INET)) 3264 pf_change_a(&saddr->v4.s_addr, 3265 pd->ip_sum, 3266 nk->addr[pd->sidx].v4.s_addr, 0); 3267 3268 if (PF_ANEQ(daddr, 3269 &nk->addr[pd->didx], AF_INET)) 3270 pf_change_a(&daddr->v4.s_addr, 3271 pd->ip_sum, 3272 nk->addr[pd->didx].v4.s_addr, 0); 3273 break; 3274#endif /* INET */ 3275#ifdef INET6 3276 case AF_INET6: 3277 if (PF_ANEQ(saddr, 3278 &nk->addr[pd->sidx], AF_INET6)) 3279 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3280 3281 if (PF_ANEQ(daddr, 3282 &nk->addr[pd->didx], AF_INET6)) 3283 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3284 break; 3285#endif /* INET */ 3286 } 3287 break; 3288 } 3289 if (nr->natpass) 3290 r = NULL; 3291 pd->nat_rule = nr; 3292 } 3293 3294 while (r != NULL) { 3295 r->evaluations++; 3296 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3297 r = r->skip[PF_SKIP_IFP].ptr; 3298 else if (r->direction && r->direction != direction) 3299 r = r->skip[PF_SKIP_DIR].ptr; 3300 else if (r->af && r->af != af) 3301 r = r->skip[PF_SKIP_AF].ptr; 3302 else if (r->proto && r->proto != pd->proto) 3303 r = r->skip[PF_SKIP_PROTO].ptr; 3304 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3305 r->src.neg, kif, M_GETFIB(m))) 3306 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3307 /* tcp/udp only. port_op always 0 in other cases */ 3308 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3309 r->src.port[0], r->src.port[1], sport)) 3310 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3311 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3312 r->dst.neg, NULL, M_GETFIB(m))) 3313 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3314 /* tcp/udp only. port_op always 0 in other cases */ 3315 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3316 r->dst.port[0], r->dst.port[1], dport)) 3317 r = r->skip[PF_SKIP_DST_PORT].ptr; 3318 /* icmp only. type always 0 in other cases */ 3319 else if (r->type && r->type != icmptype + 1) 3320 r = TAILQ_NEXT(r, entries); 3321 /* icmp only. type always 0 in other cases */ 3322 else if (r->code && r->code != icmpcode + 1) 3323 r = TAILQ_NEXT(r, entries); 3324 else if (r->tos && !(r->tos == pd->tos)) 3325 r = TAILQ_NEXT(r, entries); 3326 else if (r->rule_flag & PFRULE_FRAGMENT) 3327 r = TAILQ_NEXT(r, entries); 3328 else if (pd->proto == IPPROTO_TCP && 3329 (r->flagset & th->th_flags) != r->flags) 3330 r = TAILQ_NEXT(r, entries); 3331 /* tcp/udp only. uid.op always 0 in other cases */ 3332 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3333 pf_socket_lookup(direction, pd, m), 1)) && 3334 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3335 pd->lookup.uid)) 3336 r = TAILQ_NEXT(r, entries); 3337 /* tcp/udp only. gid.op always 0 in other cases */ 3338 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3339 pf_socket_lookup(direction, pd, m), 1)) && 3340 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3341 pd->lookup.gid)) 3342 r = TAILQ_NEXT(r, entries); 3343 else if (r->prob && 3344 r->prob <= arc4random()) 3345 r = TAILQ_NEXT(r, entries); 3346 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3347 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3348 r = TAILQ_NEXT(r, entries); 3349 else if (r->os_fingerprint != PF_OSFP_ANY && 3350 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3351 pf_osfp_fingerprint(pd, m, off, th), 3352 r->os_fingerprint))) 3353 r = TAILQ_NEXT(r, entries); 3354 else { 3355 if (r->tag) 3356 tag = r->tag; 3357 if (r->rtableid >= 0) 3358 rtableid = r->rtableid; 3359 if (r->anchor == NULL) { 3360 match = 1; 3361 *rm = r; 3362 *am = a; 3363 *rsm = ruleset; 3364 if ((*rm)->quick) 3365 break; 3366 r = TAILQ_NEXT(r, entries); 3367 } else 3368 pf_step_into_anchor(anchor_stack, &asd, 3369 &ruleset, PF_RULESET_FILTER, &r, &a, 3370 &match); 3371 } 3372 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3373 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3374 break; 3375 } 3376 r = *rm; 3377 a = *am; 3378 ruleset = *rsm; 3379 3380 REASON_SET(&reason, PFRES_MATCH); 3381 3382 if (r->log || (nr != NULL && nr->log)) { 3383 if (rewrite) 3384 m_copyback(m, off, hdrlen, pd->hdr.any); 3385 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3386 ruleset, pd, 1); 3387 } 3388 3389 if ((r->action == PF_DROP) && 3390 ((r->rule_flag & PFRULE_RETURNRST) || 3391 (r->rule_flag & PFRULE_RETURNICMP) || 3392 (r->rule_flag & PFRULE_RETURN))) { 3393 /* undo NAT changes, if they have taken place */ 3394 if (nr != NULL) { 3395 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3396 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3397 if (pd->sport) 3398 *pd->sport = sk->port[pd->sidx]; 3399 if (pd->dport) 3400 *pd->dport = sk->port[pd->didx]; 3401 if (pd->proto_sum) 3402 *pd->proto_sum = bproto_sum; 3403 if (pd->ip_sum) 3404 *pd->ip_sum = bip_sum; 3405 m_copyback(m, off, hdrlen, pd->hdr.any); 3406 } 3407 if (pd->proto == IPPROTO_TCP && 3408 ((r->rule_flag & PFRULE_RETURNRST) || 3409 (r->rule_flag & PFRULE_RETURN)) && 3410 !(th->th_flags & TH_RST)) { 3411 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3412 int len = 0; 3413#ifdef INET 3414 struct ip *h4; 3415#endif 3416#ifdef INET6 3417 struct ip6_hdr *h6; 3418#endif 3419 3420 switch (af) { 3421#ifdef INET 3422 case AF_INET: 3423 h4 = mtod(m, struct ip *); 3424 len = ntohs(h4->ip_len) - off; 3425 break; 3426#endif 3427#ifdef INET6 3428 case AF_INET6: 3429 h6 = mtod(m, struct ip6_hdr *); 3430 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3431 break; 3432#endif 3433 } 3434 3435 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3436 REASON_SET(&reason, PFRES_PROTCKSUM); 3437 else { 3438 if (th->th_flags & TH_SYN) 3439 ack++; 3440 if (th->th_flags & TH_FIN) 3441 ack++; 3442 pf_send_tcp(m, r, af, pd->dst, 3443 pd->src, th->th_dport, th->th_sport, 3444 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3445 r->return_ttl, 1, 0, kif->pfik_ifp); 3446 } 3447 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3448 r->return_icmp) 3449 pf_send_icmp(m, r->return_icmp >> 8, 3450 r->return_icmp & 255, af, r); 3451 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3452 r->return_icmp6) 3453 pf_send_icmp(m, r->return_icmp6 >> 8, 3454 r->return_icmp6 & 255, af, r); 3455 } 3456 3457 if (r->action == PF_DROP) 3458 goto cleanup; 3459 3460 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3461 REASON_SET(&reason, PFRES_MEMORY); 3462 goto cleanup; 3463 } 3464 if (rtableid >= 0) 3465 M_SETFIB(m, rtableid); 3466 3467 if (!state_icmp && (r->keep_state || nr != NULL || 3468 (pd->flags & PFDESC_TCP_NORM))) { 3469 int action; 3470 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3471 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3472 hdrlen); 3473 if (action != PF_PASS) 3474 return (action); 3475 } else { 3476 if (sk != NULL) 3477 uma_zfree(V_pf_state_key_z, sk); 3478 if (nk != NULL) 3479 uma_zfree(V_pf_state_key_z, nk); 3480 } 3481 3482 /* copy back packet headers if we performed NAT operations */ 3483 if (rewrite) 3484 m_copyback(m, off, hdrlen, pd->hdr.any); 3485 3486 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3487 direction == PF_OUT && 3488 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3489 /* 3490 * We want the state created, but we dont 3491 * want to send this in case a partner 3492 * firewall has to know about it to allow 3493 * replies through it. 3494 */ 3495 return (PF_DEFER); 3496 3497 return (PF_PASS); 3498 3499cleanup: 3500 if (sk != NULL) 3501 uma_zfree(V_pf_state_key_z, sk); 3502 if (nk != NULL) 3503 uma_zfree(V_pf_state_key_z, nk); 3504 return (PF_DROP); 3505} 3506 3507static int 3508pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3509 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3510 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3511 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3512 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3513{ 3514 struct pf_state *s = NULL; 3515 struct pf_src_node *sn = NULL; 3516 struct tcphdr *th = pd->hdr.tcp; 3517 u_int16_t mss = V_tcp_mssdflt; 3518 u_short reason; 3519 3520 /* check maximums */ 3521 if (r->max_states && 3522 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 3523 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 3524 REASON_SET(&reason, PFRES_MAXSTATES); 3525 goto csfailed; 3526 } 3527 /* src node for filter rule */ 3528 if ((r->rule_flag & PFRULE_SRCTRACK || 3529 r->rpool.opts & PF_POOL_STICKYADDR) && 3530 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3531 REASON_SET(&reason, PFRES_SRCLIMIT); 3532 goto csfailed; 3533 } 3534 /* src node for translation rule */ 3535 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3536 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3537 REASON_SET(&reason, PFRES_SRCLIMIT); 3538 goto csfailed; 3539 } 3540 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3541 if (s == NULL) { 3542 REASON_SET(&reason, PFRES_MEMORY); 3543 goto csfailed; 3544 } 3545 s->rule.ptr = r; 3546 s->nat_rule.ptr = nr; 3547 s->anchor.ptr = a; 3548 STATE_INC_COUNTERS(s); 3549 if (r->allow_opts) 3550 s->state_flags |= PFSTATE_ALLOWOPTS; 3551 if (r->rule_flag & PFRULE_STATESLOPPY) 3552 s->state_flags |= PFSTATE_SLOPPY; 3553 s->log = r->log & PF_LOG_ALL; 3554 s->sync_state = PFSYNC_S_NONE; 3555 if (nr != NULL) 3556 s->log |= nr->log & PF_LOG_ALL; 3557 switch (pd->proto) { 3558 case IPPROTO_TCP: 3559 s->src.seqlo = ntohl(th->th_seq); 3560 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3561 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3562 r->keep_state == PF_STATE_MODULATE) { 3563 /* Generate sequence number modulator */ 3564 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3565 0) 3566 s->src.seqdiff = 1; 3567 pf_change_proto_a(m, &th->th_seq, &th->th_sum, 3568 htonl(s->src.seqlo + s->src.seqdiff), 0); 3569 *rewrite = 1; 3570 } else 3571 s->src.seqdiff = 0; 3572 if (th->th_flags & TH_SYN) { 3573 s->src.seqhi++; 3574 s->src.wscale = pf_get_wscale(m, off, 3575 th->th_off, pd->af); 3576 } 3577 s->src.max_win = MAX(ntohs(th->th_win), 1); 3578 if (s->src.wscale & PF_WSCALE_MASK) { 3579 /* Remove scale factor from initial window */ 3580 int win = s->src.max_win; 3581 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3582 s->src.max_win = (win - 1) >> 3583 (s->src.wscale & PF_WSCALE_MASK); 3584 } 3585 if (th->th_flags & TH_FIN) 3586 s->src.seqhi++; 3587 s->dst.seqhi = 1; 3588 s->dst.max_win = 1; 3589 s->src.state = TCPS_SYN_SENT; 3590 s->dst.state = TCPS_CLOSED; 3591 s->timeout = PFTM_TCP_FIRST_PACKET; 3592 break; 3593 case IPPROTO_UDP: 3594 s->src.state = PFUDPS_SINGLE; 3595 s->dst.state = PFUDPS_NO_TRAFFIC; 3596 s->timeout = PFTM_UDP_FIRST_PACKET; 3597 break; 3598 case IPPROTO_ICMP: 3599#ifdef INET6 3600 case IPPROTO_ICMPV6: 3601#endif 3602 s->timeout = PFTM_ICMP_FIRST_PACKET; 3603 break; 3604 default: 3605 s->src.state = PFOTHERS_SINGLE; 3606 s->dst.state = PFOTHERS_NO_TRAFFIC; 3607 s->timeout = PFTM_OTHER_FIRST_PACKET; 3608 } 3609 3610 if (r->rt && r->rt != PF_FASTROUTE) { 3611 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) { 3612 REASON_SET(&reason, PFRES_BADSTATE); 3613 pf_src_tree_remove_state(s); 3614 STATE_DEC_COUNTERS(s); 3615 uma_zfree(V_pf_state_z, s); 3616 goto csfailed; 3617 } 3618 s->rt_kif = r->rpool.cur->kif; 3619 } 3620 3621 s->creation = time_uptime; 3622 s->expire = time_uptime; 3623 3624 if (sn != NULL) 3625 s->src_node = sn; 3626 if (nsn != NULL) { 3627 /* XXX We only modify one side for now. */ 3628 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3629 s->nat_src_node = nsn; 3630 } 3631 if (pd->proto == IPPROTO_TCP) { 3632 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3633 off, pd, th, &s->src, &s->dst)) { 3634 REASON_SET(&reason, PFRES_MEMORY); 3635 pf_src_tree_remove_state(s); 3636 STATE_DEC_COUNTERS(s); 3637 uma_zfree(V_pf_state_z, s); 3638 return (PF_DROP); 3639 } 3640 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3641 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3642 &s->src, &s->dst, rewrite)) { 3643 /* This really shouldn't happen!!! */ 3644 DPFPRINTF(PF_DEBUG_URGENT, 3645 ("pf_normalize_tcp_stateful failed on first pkt")); 3646 pf_normalize_tcp_cleanup(s); 3647 pf_src_tree_remove_state(s); 3648 STATE_DEC_COUNTERS(s); 3649 uma_zfree(V_pf_state_z, s); 3650 return (PF_DROP); 3651 } 3652 } 3653 s->direction = pd->dir; 3654 3655 /* 3656 * sk/nk could already been setup by pf_get_translation(). 3657 */ 3658 if (nr == NULL) { 3659 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3660 __func__, nr, sk, nk)); 3661 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3662 if (sk == NULL) 3663 goto csfailed; 3664 nk = sk; 3665 } else 3666 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3667 __func__, nr, sk, nk)); 3668 3669 /* Swap sk/nk for PF_OUT. */ 3670 if (pf_state_insert(BOUND_IFACE(r, kif), 3671 (pd->dir == PF_IN) ? sk : nk, 3672 (pd->dir == PF_IN) ? nk : sk, s)) { 3673 if (pd->proto == IPPROTO_TCP) 3674 pf_normalize_tcp_cleanup(s); 3675 REASON_SET(&reason, PFRES_STATEINS); 3676 pf_src_tree_remove_state(s); 3677 STATE_DEC_COUNTERS(s); 3678 uma_zfree(V_pf_state_z, s); 3679 return (PF_DROP); 3680 } else 3681 *sm = s; 3682 3683 if (tag > 0) 3684 s->tag = tag; 3685 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3686 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3687 s->src.state = PF_TCPS_PROXY_SRC; 3688 /* undo NAT changes, if they have taken place */ 3689 if (nr != NULL) { 3690 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3691 if (pd->dir == PF_OUT) 3692 skt = s->key[PF_SK_STACK]; 3693 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3694 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3695 if (pd->sport) 3696 *pd->sport = skt->port[pd->sidx]; 3697 if (pd->dport) 3698 *pd->dport = skt->port[pd->didx]; 3699 if (pd->proto_sum) 3700 *pd->proto_sum = bproto_sum; 3701 if (pd->ip_sum) 3702 *pd->ip_sum = bip_sum; 3703 m_copyback(m, off, hdrlen, pd->hdr.any); 3704 } 3705 s->src.seqhi = htonl(arc4random()); 3706 /* Find mss option */ 3707 int rtid = M_GETFIB(m); 3708 mss = pf_get_mss(m, off, th->th_off, pd->af); 3709 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3710 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3711 s->src.mss = mss; 3712 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3713 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3714 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3715 REASON_SET(&reason, PFRES_SYNPROXY); 3716 return (PF_SYNPROXY_DROP); 3717 } 3718 3719 return (PF_PASS); 3720 3721csfailed: 3722 if (sk != NULL) 3723 uma_zfree(V_pf_state_key_z, sk); 3724 if (nk != NULL) 3725 uma_zfree(V_pf_state_key_z, nk); 3726 3727 if (sn != NULL) { 3728 struct pf_srchash *sh; 3729 3730 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 3731 PF_HASHROW_LOCK(sh); 3732 if (--sn->states == 0 && sn->expire == 0) { 3733 pf_unlink_src_node(sn); 3734 uma_zfree(V_pf_sources_z, sn); 3735 counter_u64_add( 3736 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 3737 } 3738 PF_HASHROW_UNLOCK(sh); 3739 } 3740 3741 if (nsn != sn && nsn != NULL) { 3742 struct pf_srchash *sh; 3743 3744 sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)]; 3745 PF_HASHROW_LOCK(sh); 3746 if (--nsn->states == 0 && nsn->expire == 0) { 3747 pf_unlink_src_node(nsn); 3748 uma_zfree(V_pf_sources_z, nsn); 3749 counter_u64_add( 3750 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 3751 } 3752 PF_HASHROW_UNLOCK(sh); 3753 } 3754 3755 return (PF_DROP); 3756} 3757 3758static int 3759pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3760 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3761 struct pf_ruleset **rsm) 3762{ 3763 struct pf_rule *r, *a = NULL; 3764 struct pf_ruleset *ruleset = NULL; 3765 sa_family_t af = pd->af; 3766 u_short reason; 3767 int tag = -1; 3768 int asd = 0; 3769 int match = 0; 3770 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3771 3772 PF_RULES_RASSERT(); 3773 3774 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3775 while (r != NULL) { 3776 r->evaluations++; 3777 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3778 r = r->skip[PF_SKIP_IFP].ptr; 3779 else if (r->direction && r->direction != direction) 3780 r = r->skip[PF_SKIP_DIR].ptr; 3781 else if (r->af && r->af != af) 3782 r = r->skip[PF_SKIP_AF].ptr; 3783 else if (r->proto && r->proto != pd->proto) 3784 r = r->skip[PF_SKIP_PROTO].ptr; 3785 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3786 r->src.neg, kif, M_GETFIB(m))) 3787 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3788 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3789 r->dst.neg, NULL, M_GETFIB(m))) 3790 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3791 else if (r->tos && !(r->tos == pd->tos)) 3792 r = TAILQ_NEXT(r, entries); 3793 else if (r->os_fingerprint != PF_OSFP_ANY) 3794 r = TAILQ_NEXT(r, entries); 3795 else if (pd->proto == IPPROTO_UDP && 3796 (r->src.port_op || r->dst.port_op)) 3797 r = TAILQ_NEXT(r, entries); 3798 else if (pd->proto == IPPROTO_TCP && 3799 (r->src.port_op || r->dst.port_op || r->flagset)) 3800 r = TAILQ_NEXT(r, entries); 3801 else if ((pd->proto == IPPROTO_ICMP || 3802 pd->proto == IPPROTO_ICMPV6) && 3803 (r->type || r->code)) 3804 r = TAILQ_NEXT(r, entries); 3805 else if (r->prob && r->prob <= 3806 (arc4random() % (UINT_MAX - 1) + 1)) 3807 r = TAILQ_NEXT(r, entries); 3808 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3809 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3810 r = TAILQ_NEXT(r, entries); 3811 else { 3812 if (r->anchor == NULL) { 3813 match = 1; 3814 *rm = r; 3815 *am = a; 3816 *rsm = ruleset; 3817 if ((*rm)->quick) 3818 break; 3819 r = TAILQ_NEXT(r, entries); 3820 } else 3821 pf_step_into_anchor(anchor_stack, &asd, 3822 &ruleset, PF_RULESET_FILTER, &r, &a, 3823 &match); 3824 } 3825 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3826 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3827 break; 3828 } 3829 r = *rm; 3830 a = *am; 3831 ruleset = *rsm; 3832 3833 REASON_SET(&reason, PFRES_MATCH); 3834 3835 if (r->log) 3836 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3837 1); 3838 3839 if (r->action != PF_PASS) 3840 return (PF_DROP); 3841 3842 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3843 REASON_SET(&reason, PFRES_MEMORY); 3844 return (PF_DROP); 3845 } 3846 3847 return (PF_PASS); 3848} 3849 3850static int 3851pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3852 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3853 struct pf_pdesc *pd, u_short *reason, int *copyback) 3854{ 3855 struct tcphdr *th = pd->hdr.tcp; 3856 u_int16_t win = ntohs(th->th_win); 3857 u_int32_t ack, end, seq, orig_seq; 3858 u_int8_t sws, dws; 3859 int ackskew; 3860 3861 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3862 sws = src->wscale & PF_WSCALE_MASK; 3863 dws = dst->wscale & PF_WSCALE_MASK; 3864 } else 3865 sws = dws = 0; 3866 3867 /* 3868 * Sequence tracking algorithm from Guido van Rooij's paper: 3869 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3870 * tcp_filtering.ps 3871 */ 3872 3873 orig_seq = seq = ntohl(th->th_seq); 3874 if (src->seqlo == 0) { 3875 /* First packet from this end. Set its state */ 3876 3877 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3878 src->scrub == NULL) { 3879 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3880 REASON_SET(reason, PFRES_MEMORY); 3881 return (PF_DROP); 3882 } 3883 } 3884 3885 /* Deferred generation of sequence number modulator */ 3886 if (dst->seqdiff && !src->seqdiff) { 3887 /* use random iss for the TCP server */ 3888 while ((src->seqdiff = arc4random() - seq) == 0) 3889 ; 3890 ack = ntohl(th->th_ack) - dst->seqdiff; 3891 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 3892 src->seqdiff), 0); 3893 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 3894 *copyback = 1; 3895 } else { 3896 ack = ntohl(th->th_ack); 3897 } 3898 3899 end = seq + pd->p_len; 3900 if (th->th_flags & TH_SYN) { 3901 end++; 3902 if (dst->wscale & PF_WSCALE_FLAG) { 3903 src->wscale = pf_get_wscale(m, off, th->th_off, 3904 pd->af); 3905 if (src->wscale & PF_WSCALE_FLAG) { 3906 /* Remove scale factor from initial 3907 * window */ 3908 sws = src->wscale & PF_WSCALE_MASK; 3909 win = ((u_int32_t)win + (1 << sws) - 1) 3910 >> sws; 3911 dws = dst->wscale & PF_WSCALE_MASK; 3912 } else { 3913 /* fixup other window */ 3914 dst->max_win <<= dst->wscale & 3915 PF_WSCALE_MASK; 3916 /* in case of a retrans SYN|ACK */ 3917 dst->wscale = 0; 3918 } 3919 } 3920 } 3921 if (th->th_flags & TH_FIN) 3922 end++; 3923 3924 src->seqlo = seq; 3925 if (src->state < TCPS_SYN_SENT) 3926 src->state = TCPS_SYN_SENT; 3927 3928 /* 3929 * May need to slide the window (seqhi may have been set by 3930 * the crappy stack check or if we picked up the connection 3931 * after establishment) 3932 */ 3933 if (src->seqhi == 1 || 3934 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3935 src->seqhi = end + MAX(1, dst->max_win << dws); 3936 if (win > src->max_win) 3937 src->max_win = win; 3938 3939 } else { 3940 ack = ntohl(th->th_ack) - dst->seqdiff; 3941 if (src->seqdiff) { 3942 /* Modulate sequence numbers */ 3943 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 3944 src->seqdiff), 0); 3945 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 3946 *copyback = 1; 3947 } 3948 end = seq + pd->p_len; 3949 if (th->th_flags & TH_SYN) 3950 end++; 3951 if (th->th_flags & TH_FIN) 3952 end++; 3953 } 3954 3955 if ((th->th_flags & TH_ACK) == 0) { 3956 /* Let it pass through the ack skew check */ 3957 ack = dst->seqlo; 3958 } else if ((ack == 0 && 3959 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3960 /* broken tcp stacks do not set ack */ 3961 (dst->state < TCPS_SYN_SENT)) { 3962 /* 3963 * Many stacks (ours included) will set the ACK number in an 3964 * FIN|ACK if the SYN times out -- no sequence to ACK. 3965 */ 3966 ack = dst->seqlo; 3967 } 3968 3969 if (seq == end) { 3970 /* Ease sequencing restrictions on no data packets */ 3971 seq = src->seqlo; 3972 end = seq; 3973 } 3974 3975 ackskew = dst->seqlo - ack; 3976 3977 3978 /* 3979 * Need to demodulate the sequence numbers in any TCP SACK options 3980 * (Selective ACK). We could optionally validate the SACK values 3981 * against the current ACK window, either forwards or backwards, but 3982 * I'm not confident that SACK has been implemented properly 3983 * everywhere. It wouldn't surprise me if several stacks accidently 3984 * SACK too far backwards of previously ACKed data. There really aren't 3985 * any security implications of bad SACKing unless the target stack 3986 * doesn't validate the option length correctly. Someone trying to 3987 * spoof into a TCP connection won't bother blindly sending SACK 3988 * options anyway. 3989 */ 3990 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 3991 if (pf_modulate_sack(m, off, pd, th, dst)) 3992 *copyback = 1; 3993 } 3994 3995 3996#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3997 if (SEQ_GEQ(src->seqhi, end) && 3998 /* Last octet inside other's window space */ 3999 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4000 /* Retrans: not more than one window back */ 4001 (ackskew >= -MAXACKWINDOW) && 4002 /* Acking not more than one reassembled fragment backwards */ 4003 (ackskew <= (MAXACKWINDOW << sws)) && 4004 /* Acking not more than one window forward */ 4005 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4006 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4007 (pd->flags & PFDESC_IP_REAS) == 0)) { 4008 /* Require an exact/+1 sequence match on resets when possible */ 4009 4010 if (dst->scrub || src->scrub) { 4011 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4012 *state, src, dst, copyback)) 4013 return (PF_DROP); 4014 } 4015 4016 /* update max window */ 4017 if (src->max_win < win) 4018 src->max_win = win; 4019 /* synchronize sequencing */ 4020 if (SEQ_GT(end, src->seqlo)) 4021 src->seqlo = end; 4022 /* slide the window of what the other end can send */ 4023 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4024 dst->seqhi = ack + MAX((win << sws), 1); 4025 4026 4027 /* update states */ 4028 if (th->th_flags & TH_SYN) 4029 if (src->state < TCPS_SYN_SENT) 4030 src->state = TCPS_SYN_SENT; 4031 if (th->th_flags & TH_FIN) 4032 if (src->state < TCPS_CLOSING) 4033 src->state = TCPS_CLOSING; 4034 if (th->th_flags & TH_ACK) { 4035 if (dst->state == TCPS_SYN_SENT) { 4036 dst->state = TCPS_ESTABLISHED; 4037 if (src->state == TCPS_ESTABLISHED && 4038 (*state)->src_node != NULL && 4039 pf_src_connlimit(state)) { 4040 REASON_SET(reason, PFRES_SRCLIMIT); 4041 return (PF_DROP); 4042 } 4043 } else if (dst->state == TCPS_CLOSING) 4044 dst->state = TCPS_FIN_WAIT_2; 4045 } 4046 if (th->th_flags & TH_RST) 4047 src->state = dst->state = TCPS_TIME_WAIT; 4048 4049 /* update expire time */ 4050 (*state)->expire = time_uptime; 4051 if (src->state >= TCPS_FIN_WAIT_2 && 4052 dst->state >= TCPS_FIN_WAIT_2) 4053 (*state)->timeout = PFTM_TCP_CLOSED; 4054 else if (src->state >= TCPS_CLOSING && 4055 dst->state >= TCPS_CLOSING) 4056 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4057 else if (src->state < TCPS_ESTABLISHED || 4058 dst->state < TCPS_ESTABLISHED) 4059 (*state)->timeout = PFTM_TCP_OPENING; 4060 else if (src->state >= TCPS_CLOSING || 4061 dst->state >= TCPS_CLOSING) 4062 (*state)->timeout = PFTM_TCP_CLOSING; 4063 else 4064 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4065 4066 /* Fall through to PASS packet */ 4067 4068 } else if ((dst->state < TCPS_SYN_SENT || 4069 dst->state >= TCPS_FIN_WAIT_2 || 4070 src->state >= TCPS_FIN_WAIT_2) && 4071 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4072 /* Within a window forward of the originating packet */ 4073 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4074 /* Within a window backward of the originating packet */ 4075 4076 /* 4077 * This currently handles three situations: 4078 * 1) Stupid stacks will shotgun SYNs before their peer 4079 * replies. 4080 * 2) When PF catches an already established stream (the 4081 * firewall rebooted, the state table was flushed, routes 4082 * changed...) 4083 * 3) Packets get funky immediately after the connection 4084 * closes (this should catch Solaris spurious ACK|FINs 4085 * that web servers like to spew after a close) 4086 * 4087 * This must be a little more careful than the above code 4088 * since packet floods will also be caught here. We don't 4089 * update the TTL here to mitigate the damage of a packet 4090 * flood and so the same code can handle awkward establishment 4091 * and a loosened connection close. 4092 * In the establishment case, a correct peer response will 4093 * validate the connection, go through the normal state code 4094 * and keep updating the state TTL. 4095 */ 4096 4097 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4098 printf("pf: loose state match: "); 4099 pf_print_state(*state); 4100 pf_print_flags(th->th_flags); 4101 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4102 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4103 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4104 (unsigned long long)(*state)->packets[1], 4105 pd->dir == PF_IN ? "in" : "out", 4106 pd->dir == (*state)->direction ? "fwd" : "rev"); 4107 } 4108 4109 if (dst->scrub || src->scrub) { 4110 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4111 *state, src, dst, copyback)) 4112 return (PF_DROP); 4113 } 4114 4115 /* update max window */ 4116 if (src->max_win < win) 4117 src->max_win = win; 4118 /* synchronize sequencing */ 4119 if (SEQ_GT(end, src->seqlo)) 4120 src->seqlo = end; 4121 /* slide the window of what the other end can send */ 4122 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4123 dst->seqhi = ack + MAX((win << sws), 1); 4124 4125 /* 4126 * Cannot set dst->seqhi here since this could be a shotgunned 4127 * SYN and not an already established connection. 4128 */ 4129 4130 if (th->th_flags & TH_FIN) 4131 if (src->state < TCPS_CLOSING) 4132 src->state = TCPS_CLOSING; 4133 if (th->th_flags & TH_RST) 4134 src->state = dst->state = TCPS_TIME_WAIT; 4135 4136 /* Fall through to PASS packet */ 4137 4138 } else { 4139 if ((*state)->dst.state == TCPS_SYN_SENT && 4140 (*state)->src.state == TCPS_SYN_SENT) { 4141 /* Send RST for state mismatches during handshake */ 4142 if (!(th->th_flags & TH_RST)) 4143 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4144 pd->dst, pd->src, th->th_dport, 4145 th->th_sport, ntohl(th->th_ack), 0, 4146 TH_RST, 0, 0, 4147 (*state)->rule.ptr->return_ttl, 1, 0, 4148 kif->pfik_ifp); 4149 src->seqlo = 0; 4150 src->seqhi = 1; 4151 src->max_win = 1; 4152 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4153 printf("pf: BAD state: "); 4154 pf_print_state(*state); 4155 pf_print_flags(th->th_flags); 4156 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4157 "pkts=%llu:%llu dir=%s,%s\n", 4158 seq, orig_seq, ack, pd->p_len, ackskew, 4159 (unsigned long long)(*state)->packets[0], 4160 (unsigned long long)(*state)->packets[1], 4161 pd->dir == PF_IN ? "in" : "out", 4162 pd->dir == (*state)->direction ? "fwd" : "rev"); 4163 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4164 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4165 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4166 ' ': '2', 4167 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4168 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4169 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4170 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4171 } 4172 REASON_SET(reason, PFRES_BADSTATE); 4173 return (PF_DROP); 4174 } 4175 4176 return (PF_PASS); 4177} 4178 4179static int 4180pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4181 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4182{ 4183 struct tcphdr *th = pd->hdr.tcp; 4184 4185 if (th->th_flags & TH_SYN) 4186 if (src->state < TCPS_SYN_SENT) 4187 src->state = TCPS_SYN_SENT; 4188 if (th->th_flags & TH_FIN) 4189 if (src->state < TCPS_CLOSING) 4190 src->state = TCPS_CLOSING; 4191 if (th->th_flags & TH_ACK) { 4192 if (dst->state == TCPS_SYN_SENT) { 4193 dst->state = TCPS_ESTABLISHED; 4194 if (src->state == TCPS_ESTABLISHED && 4195 (*state)->src_node != NULL && 4196 pf_src_connlimit(state)) { 4197 REASON_SET(reason, PFRES_SRCLIMIT); 4198 return (PF_DROP); 4199 } 4200 } else if (dst->state == TCPS_CLOSING) { 4201 dst->state = TCPS_FIN_WAIT_2; 4202 } else if (src->state == TCPS_SYN_SENT && 4203 dst->state < TCPS_SYN_SENT) { 4204 /* 4205 * Handle a special sloppy case where we only see one 4206 * half of the connection. If there is a ACK after 4207 * the initial SYN without ever seeing a packet from 4208 * the destination, set the connection to established. 4209 */ 4210 dst->state = src->state = TCPS_ESTABLISHED; 4211 if ((*state)->src_node != NULL && 4212 pf_src_connlimit(state)) { 4213 REASON_SET(reason, PFRES_SRCLIMIT); 4214 return (PF_DROP); 4215 } 4216 } else if (src->state == TCPS_CLOSING && 4217 dst->state == TCPS_ESTABLISHED && 4218 dst->seqlo == 0) { 4219 /* 4220 * Handle the closing of half connections where we 4221 * don't see the full bidirectional FIN/ACK+ACK 4222 * handshake. 4223 */ 4224 dst->state = TCPS_CLOSING; 4225 } 4226 } 4227 if (th->th_flags & TH_RST) 4228 src->state = dst->state = TCPS_TIME_WAIT; 4229 4230 /* update expire time */ 4231 (*state)->expire = time_uptime; 4232 if (src->state >= TCPS_FIN_WAIT_2 && 4233 dst->state >= TCPS_FIN_WAIT_2) 4234 (*state)->timeout = PFTM_TCP_CLOSED; 4235 else if (src->state >= TCPS_CLOSING && 4236 dst->state >= TCPS_CLOSING) 4237 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4238 else if (src->state < TCPS_ESTABLISHED || 4239 dst->state < TCPS_ESTABLISHED) 4240 (*state)->timeout = PFTM_TCP_OPENING; 4241 else if (src->state >= TCPS_CLOSING || 4242 dst->state >= TCPS_CLOSING) 4243 (*state)->timeout = PFTM_TCP_CLOSING; 4244 else 4245 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4246 4247 return (PF_PASS); 4248} 4249 4250static int 4251pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4252 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4253 u_short *reason) 4254{ 4255 struct pf_state_key_cmp key; 4256 struct tcphdr *th = pd->hdr.tcp; 4257 int copyback = 0; 4258 struct pf_state_peer *src, *dst; 4259 struct pf_state_key *sk; 4260 4261 bzero(&key, sizeof(key)); 4262 key.af = pd->af; 4263 key.proto = IPPROTO_TCP; 4264 if (direction == PF_IN) { /* wire side, straight */ 4265 PF_ACPY(&key.addr[0], pd->src, key.af); 4266 PF_ACPY(&key.addr[1], pd->dst, key.af); 4267 key.port[0] = th->th_sport; 4268 key.port[1] = th->th_dport; 4269 } else { /* stack side, reverse */ 4270 PF_ACPY(&key.addr[1], pd->src, key.af); 4271 PF_ACPY(&key.addr[0], pd->dst, key.af); 4272 key.port[1] = th->th_sport; 4273 key.port[0] = th->th_dport; 4274 } 4275 4276 STATE_LOOKUP(kif, &key, direction, *state, pd); 4277 4278 if (direction == (*state)->direction) { 4279 src = &(*state)->src; 4280 dst = &(*state)->dst; 4281 } else { 4282 src = &(*state)->dst; 4283 dst = &(*state)->src; 4284 } 4285 4286 sk = (*state)->key[pd->didx]; 4287 4288 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4289 if (direction != (*state)->direction) { 4290 REASON_SET(reason, PFRES_SYNPROXY); 4291 return (PF_SYNPROXY_DROP); 4292 } 4293 if (th->th_flags & TH_SYN) { 4294 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4295 REASON_SET(reason, PFRES_SYNPROXY); 4296 return (PF_DROP); 4297 } 4298 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4299 pd->src, th->th_dport, th->th_sport, 4300 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4301 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4302 REASON_SET(reason, PFRES_SYNPROXY); 4303 return (PF_SYNPROXY_DROP); 4304 } else if (!(th->th_flags & TH_ACK) || 4305 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4306 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4307 REASON_SET(reason, PFRES_SYNPROXY); 4308 return (PF_DROP); 4309 } else if ((*state)->src_node != NULL && 4310 pf_src_connlimit(state)) { 4311 REASON_SET(reason, PFRES_SRCLIMIT); 4312 return (PF_DROP); 4313 } else 4314 (*state)->src.state = PF_TCPS_PROXY_DST; 4315 } 4316 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4317 if (direction == (*state)->direction) { 4318 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4319 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4320 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4321 REASON_SET(reason, PFRES_SYNPROXY); 4322 return (PF_DROP); 4323 } 4324 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4325 if ((*state)->dst.seqhi == 1) 4326 (*state)->dst.seqhi = htonl(arc4random()); 4327 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4328 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4329 sk->port[pd->sidx], sk->port[pd->didx], 4330 (*state)->dst.seqhi, 0, TH_SYN, 0, 4331 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4332 REASON_SET(reason, PFRES_SYNPROXY); 4333 return (PF_SYNPROXY_DROP); 4334 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4335 (TH_SYN|TH_ACK)) || 4336 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4337 REASON_SET(reason, PFRES_SYNPROXY); 4338 return (PF_DROP); 4339 } else { 4340 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4341 (*state)->dst.seqlo = ntohl(th->th_seq); 4342 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4343 pd->src, th->th_dport, th->th_sport, 4344 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4345 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4346 (*state)->tag, NULL); 4347 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4348 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4349 sk->port[pd->sidx], sk->port[pd->didx], 4350 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4351 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4352 (*state)->src.seqdiff = (*state)->dst.seqhi - 4353 (*state)->src.seqlo; 4354 (*state)->dst.seqdiff = (*state)->src.seqhi - 4355 (*state)->dst.seqlo; 4356 (*state)->src.seqhi = (*state)->src.seqlo + 4357 (*state)->dst.max_win; 4358 (*state)->dst.seqhi = (*state)->dst.seqlo + 4359 (*state)->src.max_win; 4360 (*state)->src.wscale = (*state)->dst.wscale = 0; 4361 (*state)->src.state = (*state)->dst.state = 4362 TCPS_ESTABLISHED; 4363 REASON_SET(reason, PFRES_SYNPROXY); 4364 return (PF_SYNPROXY_DROP); 4365 } 4366 } 4367 4368 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4369 dst->state >= TCPS_FIN_WAIT_2 && 4370 src->state >= TCPS_FIN_WAIT_2) { 4371 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4372 printf("pf: state reuse "); 4373 pf_print_state(*state); 4374 pf_print_flags(th->th_flags); 4375 printf("\n"); 4376 } 4377 /* XXX make sure it's the same direction ?? */ 4378 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4379 pf_unlink_state(*state, PF_ENTER_LOCKED); 4380 *state = NULL; 4381 return (PF_DROP); 4382 } 4383 4384 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4385 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4386 return (PF_DROP); 4387 } else { 4388 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4389 ©back) == PF_DROP) 4390 return (PF_DROP); 4391 } 4392 4393 /* translate source/destination address, if necessary */ 4394 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4395 struct pf_state_key *nk = (*state)->key[pd->didx]; 4396 4397 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4398 nk->port[pd->sidx] != th->th_sport) 4399 pf_change_ap(m, pd->src, &th->th_sport, 4400 pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], 4401 nk->port[pd->sidx], 0, pd->af); 4402 4403 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4404 nk->port[pd->didx] != th->th_dport) 4405 pf_change_ap(m, pd->dst, &th->th_dport, 4406 pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], 4407 nk->port[pd->didx], 0, pd->af); 4408 copyback = 1; 4409 } 4410 4411 /* Copyback sequence modulation or stateful scrub changes if needed */ 4412 if (copyback) 4413 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4414 4415 return (PF_PASS); 4416} 4417 4418static int 4419pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4420 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4421{ 4422 struct pf_state_peer *src, *dst; 4423 struct pf_state_key_cmp key; 4424 struct udphdr *uh = pd->hdr.udp; 4425 4426 bzero(&key, sizeof(key)); 4427 key.af = pd->af; 4428 key.proto = IPPROTO_UDP; 4429 if (direction == PF_IN) { /* wire side, straight */ 4430 PF_ACPY(&key.addr[0], pd->src, key.af); 4431 PF_ACPY(&key.addr[1], pd->dst, key.af); 4432 key.port[0] = uh->uh_sport; 4433 key.port[1] = uh->uh_dport; 4434 } else { /* stack side, reverse */ 4435 PF_ACPY(&key.addr[1], pd->src, key.af); 4436 PF_ACPY(&key.addr[0], pd->dst, key.af); 4437 key.port[1] = uh->uh_sport; 4438 key.port[0] = uh->uh_dport; 4439 } 4440 4441 STATE_LOOKUP(kif, &key, direction, *state, pd); 4442 4443 if (direction == (*state)->direction) { 4444 src = &(*state)->src; 4445 dst = &(*state)->dst; 4446 } else { 4447 src = &(*state)->dst; 4448 dst = &(*state)->src; 4449 } 4450 4451 /* update states */ 4452 if (src->state < PFUDPS_SINGLE) 4453 src->state = PFUDPS_SINGLE; 4454 if (dst->state == PFUDPS_SINGLE) 4455 dst->state = PFUDPS_MULTIPLE; 4456 4457 /* update expire time */ 4458 (*state)->expire = time_uptime; 4459 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4460 (*state)->timeout = PFTM_UDP_MULTIPLE; 4461 else 4462 (*state)->timeout = PFTM_UDP_SINGLE; 4463 4464 /* translate source/destination address, if necessary */ 4465 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4466 struct pf_state_key *nk = (*state)->key[pd->didx]; 4467 4468 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4469 nk->port[pd->sidx] != uh->uh_sport) 4470 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 4471 &uh->uh_sum, &nk->addr[pd->sidx], 4472 nk->port[pd->sidx], 1, pd->af); 4473 4474 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4475 nk->port[pd->didx] != uh->uh_dport) 4476 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 4477 &uh->uh_sum, &nk->addr[pd->didx], 4478 nk->port[pd->didx], 1, pd->af); 4479 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4480 } 4481 4482 return (PF_PASS); 4483} 4484 4485static int 4486pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4487 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4488{ 4489 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4490 u_int16_t icmpid = 0, *icmpsum; 4491 u_int8_t icmptype; 4492 int state_icmp = 0; 4493 struct pf_state_key_cmp key; 4494 4495 bzero(&key, sizeof(key)); 4496 switch (pd->proto) { 4497#ifdef INET 4498 case IPPROTO_ICMP: 4499 icmptype = pd->hdr.icmp->icmp_type; 4500 icmpid = pd->hdr.icmp->icmp_id; 4501 icmpsum = &pd->hdr.icmp->icmp_cksum; 4502 4503 if (icmptype == ICMP_UNREACH || 4504 icmptype == ICMP_SOURCEQUENCH || 4505 icmptype == ICMP_REDIRECT || 4506 icmptype == ICMP_TIMXCEED || 4507 icmptype == ICMP_PARAMPROB) 4508 state_icmp++; 4509 break; 4510#endif /* INET */ 4511#ifdef INET6 4512 case IPPROTO_ICMPV6: 4513 icmptype = pd->hdr.icmp6->icmp6_type; 4514 icmpid = pd->hdr.icmp6->icmp6_id; 4515 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4516 4517 if (icmptype == ICMP6_DST_UNREACH || 4518 icmptype == ICMP6_PACKET_TOO_BIG || 4519 icmptype == ICMP6_TIME_EXCEEDED || 4520 icmptype == ICMP6_PARAM_PROB) 4521 state_icmp++; 4522 break; 4523#endif /* INET6 */ 4524 } 4525 4526 if (!state_icmp) { 4527 4528 /* 4529 * ICMP query/reply message not related to a TCP/UDP packet. 4530 * Search for an ICMP state. 4531 */ 4532 key.af = pd->af; 4533 key.proto = pd->proto; 4534 key.port[0] = key.port[1] = icmpid; 4535 if (direction == PF_IN) { /* wire side, straight */ 4536 PF_ACPY(&key.addr[0], pd->src, key.af); 4537 PF_ACPY(&key.addr[1], pd->dst, key.af); 4538 } else { /* stack side, reverse */ 4539 PF_ACPY(&key.addr[1], pd->src, key.af); 4540 PF_ACPY(&key.addr[0], pd->dst, key.af); 4541 } 4542 4543 STATE_LOOKUP(kif, &key, direction, *state, pd); 4544 4545 (*state)->expire = time_uptime; 4546 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4547 4548 /* translate source/destination address, if necessary */ 4549 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4550 struct pf_state_key *nk = (*state)->key[pd->didx]; 4551 4552 switch (pd->af) { 4553#ifdef INET 4554 case AF_INET: 4555 if (PF_ANEQ(pd->src, 4556 &nk->addr[pd->sidx], AF_INET)) 4557 pf_change_a(&saddr->v4.s_addr, 4558 pd->ip_sum, 4559 nk->addr[pd->sidx].v4.s_addr, 0); 4560 4561 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4562 AF_INET)) 4563 pf_change_a(&daddr->v4.s_addr, 4564 pd->ip_sum, 4565 nk->addr[pd->didx].v4.s_addr, 0); 4566 4567 if (nk->port[0] != 4568 pd->hdr.icmp->icmp_id) { 4569 pd->hdr.icmp->icmp_cksum = 4570 pf_cksum_fixup( 4571 pd->hdr.icmp->icmp_cksum, icmpid, 4572 nk->port[pd->sidx], 0); 4573 pd->hdr.icmp->icmp_id = 4574 nk->port[pd->sidx]; 4575 } 4576 4577 m_copyback(m, off, ICMP_MINLEN, 4578 (caddr_t )pd->hdr.icmp); 4579 break; 4580#endif /* INET */ 4581#ifdef INET6 4582 case AF_INET6: 4583 if (PF_ANEQ(pd->src, 4584 &nk->addr[pd->sidx], AF_INET6)) 4585 pf_change_a6(saddr, 4586 &pd->hdr.icmp6->icmp6_cksum, 4587 &nk->addr[pd->sidx], 0); 4588 4589 if (PF_ANEQ(pd->dst, 4590 &nk->addr[pd->didx], AF_INET6)) 4591 pf_change_a6(daddr, 4592 &pd->hdr.icmp6->icmp6_cksum, 4593 &nk->addr[pd->didx], 0); 4594 4595 m_copyback(m, off, sizeof(struct icmp6_hdr), 4596 (caddr_t )pd->hdr.icmp6); 4597 break; 4598#endif /* INET6 */ 4599 } 4600 } 4601 return (PF_PASS); 4602 4603 } else { 4604 /* 4605 * ICMP error message in response to a TCP/UDP packet. 4606 * Extract the inner TCP/UDP header and search for that state. 4607 */ 4608 4609 struct pf_pdesc pd2; 4610 bzero(&pd2, sizeof pd2); 4611#ifdef INET 4612 struct ip h2; 4613#endif /* INET */ 4614#ifdef INET6 4615 struct ip6_hdr h2_6; 4616 int terminal = 0; 4617#endif /* INET6 */ 4618 int ipoff2 = 0; 4619 int off2 = 0; 4620 4621 pd2.af = pd->af; 4622 /* Payload packet is from the opposite direction. */ 4623 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4624 pd2.didx = (direction == PF_IN) ? 0 : 1; 4625 switch (pd->af) { 4626#ifdef INET 4627 case AF_INET: 4628 /* offset of h2 in mbuf chain */ 4629 ipoff2 = off + ICMP_MINLEN; 4630 4631 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4632 NULL, reason, pd2.af)) { 4633 DPFPRINTF(PF_DEBUG_MISC, 4634 ("pf: ICMP error message too short " 4635 "(ip)\n")); 4636 return (PF_DROP); 4637 } 4638 /* 4639 * ICMP error messages don't refer to non-first 4640 * fragments 4641 */ 4642 if (h2.ip_off & htons(IP_OFFMASK)) { 4643 REASON_SET(reason, PFRES_FRAG); 4644 return (PF_DROP); 4645 } 4646 4647 /* offset of protocol header that follows h2 */ 4648 off2 = ipoff2 + (h2.ip_hl << 2); 4649 4650 pd2.proto = h2.ip_p; 4651 pd2.src = (struct pf_addr *)&h2.ip_src; 4652 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4653 pd2.ip_sum = &h2.ip_sum; 4654 break; 4655#endif /* INET */ 4656#ifdef INET6 4657 case AF_INET6: 4658 ipoff2 = off + sizeof(struct icmp6_hdr); 4659 4660 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4661 NULL, reason, pd2.af)) { 4662 DPFPRINTF(PF_DEBUG_MISC, 4663 ("pf: ICMP error message too short " 4664 "(ip6)\n")); 4665 return (PF_DROP); 4666 } 4667 pd2.proto = h2_6.ip6_nxt; 4668 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4669 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4670 pd2.ip_sum = NULL; 4671 off2 = ipoff2 + sizeof(h2_6); 4672 do { 4673 switch (pd2.proto) { 4674 case IPPROTO_FRAGMENT: 4675 /* 4676 * ICMPv6 error messages for 4677 * non-first fragments 4678 */ 4679 REASON_SET(reason, PFRES_FRAG); 4680 return (PF_DROP); 4681 case IPPROTO_AH: 4682 case IPPROTO_HOPOPTS: 4683 case IPPROTO_ROUTING: 4684 case IPPROTO_DSTOPTS: { 4685 /* get next header and header length */ 4686 struct ip6_ext opt6; 4687 4688 if (!pf_pull_hdr(m, off2, &opt6, 4689 sizeof(opt6), NULL, reason, 4690 pd2.af)) { 4691 DPFPRINTF(PF_DEBUG_MISC, 4692 ("pf: ICMPv6 short opt\n")); 4693 return (PF_DROP); 4694 } 4695 if (pd2.proto == IPPROTO_AH) 4696 off2 += (opt6.ip6e_len + 2) * 4; 4697 else 4698 off2 += (opt6.ip6e_len + 1) * 8; 4699 pd2.proto = opt6.ip6e_nxt; 4700 /* goto the next header */ 4701 break; 4702 } 4703 default: 4704 terminal++; 4705 break; 4706 } 4707 } while (!terminal); 4708 break; 4709#endif /* INET6 */ 4710 } 4711 4712 switch (pd2.proto) { 4713 case IPPROTO_TCP: { 4714 struct tcphdr th; 4715 u_int32_t seq; 4716 struct pf_state_peer *src, *dst; 4717 u_int8_t dws; 4718 int copyback = 0; 4719 4720 /* 4721 * Only the first 8 bytes of the TCP header can be 4722 * expected. Don't access any TCP header fields after 4723 * th_seq, an ackskew test is not possible. 4724 */ 4725 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4726 pd2.af)) { 4727 DPFPRINTF(PF_DEBUG_MISC, 4728 ("pf: ICMP error message too short " 4729 "(tcp)\n")); 4730 return (PF_DROP); 4731 } 4732 4733 key.af = pd2.af; 4734 key.proto = IPPROTO_TCP; 4735 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4736 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4737 key.port[pd2.sidx] = th.th_sport; 4738 key.port[pd2.didx] = th.th_dport; 4739 4740 STATE_LOOKUP(kif, &key, direction, *state, pd); 4741 4742 if (direction == (*state)->direction) { 4743 src = &(*state)->dst; 4744 dst = &(*state)->src; 4745 } else { 4746 src = &(*state)->src; 4747 dst = &(*state)->dst; 4748 } 4749 4750 if (src->wscale && dst->wscale) 4751 dws = dst->wscale & PF_WSCALE_MASK; 4752 else 4753 dws = 0; 4754 4755 /* Demodulate sequence number */ 4756 seq = ntohl(th.th_seq) - src->seqdiff; 4757 if (src->seqdiff) { 4758 pf_change_a(&th.th_seq, icmpsum, 4759 htonl(seq), 0); 4760 copyback = 1; 4761 } 4762 4763 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4764 (!SEQ_GEQ(src->seqhi, seq) || 4765 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4766 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4767 printf("pf: BAD ICMP %d:%d ", 4768 icmptype, pd->hdr.icmp->icmp_code); 4769 pf_print_host(pd->src, 0, pd->af); 4770 printf(" -> "); 4771 pf_print_host(pd->dst, 0, pd->af); 4772 printf(" state: "); 4773 pf_print_state(*state); 4774 printf(" seq=%u\n", seq); 4775 } 4776 REASON_SET(reason, PFRES_BADSTATE); 4777 return (PF_DROP); 4778 } else { 4779 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4780 printf("pf: OK ICMP %d:%d ", 4781 icmptype, pd->hdr.icmp->icmp_code); 4782 pf_print_host(pd->src, 0, pd->af); 4783 printf(" -> "); 4784 pf_print_host(pd->dst, 0, pd->af); 4785 printf(" state: "); 4786 pf_print_state(*state); 4787 printf(" seq=%u\n", seq); 4788 } 4789 } 4790 4791 /* translate source/destination address, if necessary */ 4792 if ((*state)->key[PF_SK_WIRE] != 4793 (*state)->key[PF_SK_STACK]) { 4794 struct pf_state_key *nk = 4795 (*state)->key[pd->didx]; 4796 4797 if (PF_ANEQ(pd2.src, 4798 &nk->addr[pd2.sidx], pd2.af) || 4799 nk->port[pd2.sidx] != th.th_sport) 4800 pf_change_icmp(pd2.src, &th.th_sport, 4801 daddr, &nk->addr[pd2.sidx], 4802 nk->port[pd2.sidx], NULL, 4803 pd2.ip_sum, icmpsum, 4804 pd->ip_sum, 0, pd2.af); 4805 4806 if (PF_ANEQ(pd2.dst, 4807 &nk->addr[pd2.didx], pd2.af) || 4808 nk->port[pd2.didx] != th.th_dport) 4809 pf_change_icmp(pd2.dst, &th.th_dport, 4810 saddr, &nk->addr[pd2.didx], 4811 nk->port[pd2.didx], NULL, 4812 pd2.ip_sum, icmpsum, 4813 pd->ip_sum, 0, pd2.af); 4814 copyback = 1; 4815 } 4816 4817 if (copyback) { 4818 switch (pd2.af) { 4819#ifdef INET 4820 case AF_INET: 4821 m_copyback(m, off, ICMP_MINLEN, 4822 (caddr_t )pd->hdr.icmp); 4823 m_copyback(m, ipoff2, sizeof(h2), 4824 (caddr_t )&h2); 4825 break; 4826#endif /* INET */ 4827#ifdef INET6 4828 case AF_INET6: 4829 m_copyback(m, off, 4830 sizeof(struct icmp6_hdr), 4831 (caddr_t )pd->hdr.icmp6); 4832 m_copyback(m, ipoff2, sizeof(h2_6), 4833 (caddr_t )&h2_6); 4834 break; 4835#endif /* INET6 */ 4836 } 4837 m_copyback(m, off2, 8, (caddr_t)&th); 4838 } 4839 4840 return (PF_PASS); 4841 break; 4842 } 4843 case IPPROTO_UDP: { 4844 struct udphdr uh; 4845 4846 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4847 NULL, reason, pd2.af)) { 4848 DPFPRINTF(PF_DEBUG_MISC, 4849 ("pf: ICMP error message too short " 4850 "(udp)\n")); 4851 return (PF_DROP); 4852 } 4853 4854 key.af = pd2.af; 4855 key.proto = IPPROTO_UDP; 4856 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4857 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4858 key.port[pd2.sidx] = uh.uh_sport; 4859 key.port[pd2.didx] = uh.uh_dport; 4860 4861 STATE_LOOKUP(kif, &key, direction, *state, pd); 4862 4863 /* translate source/destination address, if necessary */ 4864 if ((*state)->key[PF_SK_WIRE] != 4865 (*state)->key[PF_SK_STACK]) { 4866 struct pf_state_key *nk = 4867 (*state)->key[pd->didx]; 4868 4869 if (PF_ANEQ(pd2.src, 4870 &nk->addr[pd2.sidx], pd2.af) || 4871 nk->port[pd2.sidx] != uh.uh_sport) 4872 pf_change_icmp(pd2.src, &uh.uh_sport, 4873 daddr, &nk->addr[pd2.sidx], 4874 nk->port[pd2.sidx], &uh.uh_sum, 4875 pd2.ip_sum, icmpsum, 4876 pd->ip_sum, 1, pd2.af); 4877 4878 if (PF_ANEQ(pd2.dst, 4879 &nk->addr[pd2.didx], pd2.af) || 4880 nk->port[pd2.didx] != uh.uh_dport) 4881 pf_change_icmp(pd2.dst, &uh.uh_dport, 4882 saddr, &nk->addr[pd2.didx], 4883 nk->port[pd2.didx], &uh.uh_sum, 4884 pd2.ip_sum, icmpsum, 4885 pd->ip_sum, 1, pd2.af); 4886 4887 switch (pd2.af) { 4888#ifdef INET 4889 case AF_INET: 4890 m_copyback(m, off, ICMP_MINLEN, 4891 (caddr_t )pd->hdr.icmp); 4892 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4893 break; 4894#endif /* INET */ 4895#ifdef INET6 4896 case AF_INET6: 4897 m_copyback(m, off, 4898 sizeof(struct icmp6_hdr), 4899 (caddr_t )pd->hdr.icmp6); 4900 m_copyback(m, ipoff2, sizeof(h2_6), 4901 (caddr_t )&h2_6); 4902 break; 4903#endif /* INET6 */ 4904 } 4905 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4906 } 4907 return (PF_PASS); 4908 break; 4909 } 4910#ifdef INET 4911 case IPPROTO_ICMP: { 4912 struct icmp iih; 4913 4914 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4915 NULL, reason, pd2.af)) { 4916 DPFPRINTF(PF_DEBUG_MISC, 4917 ("pf: ICMP error message too short i" 4918 "(icmp)\n")); 4919 return (PF_DROP); 4920 } 4921 4922 key.af = pd2.af; 4923 key.proto = IPPROTO_ICMP; 4924 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4925 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4926 key.port[0] = key.port[1] = iih.icmp_id; 4927 4928 STATE_LOOKUP(kif, &key, direction, *state, pd); 4929 4930 /* translate source/destination address, if necessary */ 4931 if ((*state)->key[PF_SK_WIRE] != 4932 (*state)->key[PF_SK_STACK]) { 4933 struct pf_state_key *nk = 4934 (*state)->key[pd->didx]; 4935 4936 if (PF_ANEQ(pd2.src, 4937 &nk->addr[pd2.sidx], pd2.af) || 4938 nk->port[pd2.sidx] != iih.icmp_id) 4939 pf_change_icmp(pd2.src, &iih.icmp_id, 4940 daddr, &nk->addr[pd2.sidx], 4941 nk->port[pd2.sidx], NULL, 4942 pd2.ip_sum, icmpsum, 4943 pd->ip_sum, 0, AF_INET); 4944 4945 if (PF_ANEQ(pd2.dst, 4946 &nk->addr[pd2.didx], pd2.af) || 4947 nk->port[pd2.didx] != iih.icmp_id) 4948 pf_change_icmp(pd2.dst, &iih.icmp_id, 4949 saddr, &nk->addr[pd2.didx], 4950 nk->port[pd2.didx], NULL, 4951 pd2.ip_sum, icmpsum, 4952 pd->ip_sum, 0, AF_INET); 4953 4954 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4955 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4956 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4957 } 4958 return (PF_PASS); 4959 break; 4960 } 4961#endif /* INET */ 4962#ifdef INET6 4963 case IPPROTO_ICMPV6: { 4964 struct icmp6_hdr iih; 4965 4966 if (!pf_pull_hdr(m, off2, &iih, 4967 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4968 DPFPRINTF(PF_DEBUG_MISC, 4969 ("pf: ICMP error message too short " 4970 "(icmp6)\n")); 4971 return (PF_DROP); 4972 } 4973 4974 key.af = pd2.af; 4975 key.proto = IPPROTO_ICMPV6; 4976 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4977 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4978 key.port[0] = key.port[1] = iih.icmp6_id; 4979 4980 STATE_LOOKUP(kif, &key, direction, *state, pd); 4981 4982 /* translate source/destination address, if necessary */ 4983 if ((*state)->key[PF_SK_WIRE] != 4984 (*state)->key[PF_SK_STACK]) { 4985 struct pf_state_key *nk = 4986 (*state)->key[pd->didx]; 4987 4988 if (PF_ANEQ(pd2.src, 4989 &nk->addr[pd2.sidx], pd2.af) || 4990 nk->port[pd2.sidx] != iih.icmp6_id) 4991 pf_change_icmp(pd2.src, &iih.icmp6_id, 4992 daddr, &nk->addr[pd2.sidx], 4993 nk->port[pd2.sidx], NULL, 4994 pd2.ip_sum, icmpsum, 4995 pd->ip_sum, 0, AF_INET6); 4996 4997 if (PF_ANEQ(pd2.dst, 4998 &nk->addr[pd2.didx], pd2.af) || 4999 nk->port[pd2.didx] != iih.icmp6_id) 5000 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5001 saddr, &nk->addr[pd2.didx], 5002 nk->port[pd2.didx], NULL, 5003 pd2.ip_sum, icmpsum, 5004 pd->ip_sum, 0, AF_INET6); 5005 5006 m_copyback(m, off, sizeof(struct icmp6_hdr), 5007 (caddr_t)pd->hdr.icmp6); 5008 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5009 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5010 (caddr_t)&iih); 5011 } 5012 return (PF_PASS); 5013 break; 5014 } 5015#endif /* INET6 */ 5016 default: { 5017 key.af = pd2.af; 5018 key.proto = pd2.proto; 5019 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5020 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5021 key.port[0] = key.port[1] = 0; 5022 5023 STATE_LOOKUP(kif, &key, direction, *state, pd); 5024 5025 /* translate source/destination address, if necessary */ 5026 if ((*state)->key[PF_SK_WIRE] != 5027 (*state)->key[PF_SK_STACK]) { 5028 struct pf_state_key *nk = 5029 (*state)->key[pd->didx]; 5030 5031 if (PF_ANEQ(pd2.src, 5032 &nk->addr[pd2.sidx], pd2.af)) 5033 pf_change_icmp(pd2.src, NULL, daddr, 5034 &nk->addr[pd2.sidx], 0, NULL, 5035 pd2.ip_sum, icmpsum, 5036 pd->ip_sum, 0, pd2.af); 5037 5038 if (PF_ANEQ(pd2.dst, 5039 &nk->addr[pd2.didx], pd2.af)) 5040 pf_change_icmp(pd2.dst, NULL, saddr, 5041 &nk->addr[pd2.didx], 0, NULL, 5042 pd2.ip_sum, icmpsum, 5043 pd->ip_sum, 0, pd2.af); 5044 5045 switch (pd2.af) { 5046#ifdef INET 5047 case AF_INET: 5048 m_copyback(m, off, ICMP_MINLEN, 5049 (caddr_t)pd->hdr.icmp); 5050 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5051 break; 5052#endif /* INET */ 5053#ifdef INET6 5054 case AF_INET6: 5055 m_copyback(m, off, 5056 sizeof(struct icmp6_hdr), 5057 (caddr_t )pd->hdr.icmp6); 5058 m_copyback(m, ipoff2, sizeof(h2_6), 5059 (caddr_t )&h2_6); 5060 break; 5061#endif /* INET6 */ 5062 } 5063 } 5064 return (PF_PASS); 5065 break; 5066 } 5067 } 5068 } 5069} 5070 5071static int 5072pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5073 struct mbuf *m, struct pf_pdesc *pd) 5074{ 5075 struct pf_state_peer *src, *dst; 5076 struct pf_state_key_cmp key; 5077 5078 bzero(&key, sizeof(key)); 5079 key.af = pd->af; 5080 key.proto = pd->proto; 5081 if (direction == PF_IN) { 5082 PF_ACPY(&key.addr[0], pd->src, key.af); 5083 PF_ACPY(&key.addr[1], pd->dst, key.af); 5084 key.port[0] = key.port[1] = 0; 5085 } else { 5086 PF_ACPY(&key.addr[1], pd->src, key.af); 5087 PF_ACPY(&key.addr[0], pd->dst, key.af); 5088 key.port[1] = key.port[0] = 0; 5089 } 5090 5091 STATE_LOOKUP(kif, &key, direction, *state, pd); 5092 5093 if (direction == (*state)->direction) { 5094 src = &(*state)->src; 5095 dst = &(*state)->dst; 5096 } else { 5097 src = &(*state)->dst; 5098 dst = &(*state)->src; 5099 } 5100 5101 /* update states */ 5102 if (src->state < PFOTHERS_SINGLE) 5103 src->state = PFOTHERS_SINGLE; 5104 if (dst->state == PFOTHERS_SINGLE) 5105 dst->state = PFOTHERS_MULTIPLE; 5106 5107 /* update expire time */ 5108 (*state)->expire = time_uptime; 5109 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5110 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5111 else 5112 (*state)->timeout = PFTM_OTHER_SINGLE; 5113 5114 /* translate source/destination address, if necessary */ 5115 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5116 struct pf_state_key *nk = (*state)->key[pd->didx]; 5117 5118 KASSERT(nk, ("%s: nk is null", __func__)); 5119 KASSERT(pd, ("%s: pd is null", __func__)); 5120 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5121 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5122 switch (pd->af) { 5123#ifdef INET 5124 case AF_INET: 5125 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5126 pf_change_a(&pd->src->v4.s_addr, 5127 pd->ip_sum, 5128 nk->addr[pd->sidx].v4.s_addr, 5129 0); 5130 5131 5132 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5133 pf_change_a(&pd->dst->v4.s_addr, 5134 pd->ip_sum, 5135 nk->addr[pd->didx].v4.s_addr, 5136 0); 5137 5138 break; 5139#endif /* INET */ 5140#ifdef INET6 5141 case AF_INET6: 5142 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5143 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5144 5145 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5146 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5147#endif /* INET6 */ 5148 } 5149 } 5150 return (PF_PASS); 5151} 5152 5153/* 5154 * ipoff and off are measured from the start of the mbuf chain. 5155 * h must be at "ipoff" on the mbuf chain. 5156 */ 5157void * 5158pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5159 u_short *actionp, u_short *reasonp, sa_family_t af) 5160{ 5161 switch (af) { 5162#ifdef INET 5163 case AF_INET: { 5164 struct ip *h = mtod(m, struct ip *); 5165 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5166 5167 if (fragoff) { 5168 if (fragoff >= len) 5169 ACTION_SET(actionp, PF_PASS); 5170 else { 5171 ACTION_SET(actionp, PF_DROP); 5172 REASON_SET(reasonp, PFRES_FRAG); 5173 } 5174 return (NULL); 5175 } 5176 if (m->m_pkthdr.len < off + len || 5177 ntohs(h->ip_len) < off + len) { 5178 ACTION_SET(actionp, PF_DROP); 5179 REASON_SET(reasonp, PFRES_SHORT); 5180 return (NULL); 5181 } 5182 break; 5183 } 5184#endif /* INET */ 5185#ifdef INET6 5186 case AF_INET6: { 5187 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5188 5189 if (m->m_pkthdr.len < off + len || 5190 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5191 (unsigned)(off + len)) { 5192 ACTION_SET(actionp, PF_DROP); 5193 REASON_SET(reasonp, PFRES_SHORT); 5194 return (NULL); 5195 } 5196 break; 5197 } 5198#endif /* INET6 */ 5199 } 5200 m_copydata(m, off, len, p); 5201 return (p); 5202} 5203 5204int 5205pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5206 int rtableid) 5207{ 5208#ifdef RADIX_MPATH 5209 struct radix_node_head *rnh; 5210#endif 5211 struct sockaddr_in *dst; 5212 int ret = 1; 5213 int check_mpath; 5214#ifdef INET6 5215 struct sockaddr_in6 *dst6; 5216 struct route_in6 ro; 5217#else 5218 struct route ro; 5219#endif 5220 struct radix_node *rn; 5221 struct rtentry *rt; 5222 struct ifnet *ifp; 5223 5224 check_mpath = 0; 5225#ifdef RADIX_MPATH 5226 /* XXX: stick to table 0 for now */ 5227 rnh = rt_tables_get_rnh(0, af); 5228 if (rnh != NULL && rn_mpath_capable(rnh)) 5229 check_mpath = 1; 5230#endif 5231 bzero(&ro, sizeof(ro)); 5232 switch (af) { 5233 case AF_INET: 5234 dst = satosin(&ro.ro_dst); 5235 dst->sin_family = AF_INET; 5236 dst->sin_len = sizeof(*dst); 5237 dst->sin_addr = addr->v4; 5238 break; 5239#ifdef INET6 5240 case AF_INET6: 5241 /* 5242 * Skip check for addresses with embedded interface scope, 5243 * as they would always match anyway. 5244 */ 5245 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5246 goto out; 5247 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5248 dst6->sin6_family = AF_INET6; 5249 dst6->sin6_len = sizeof(*dst6); 5250 dst6->sin6_addr = addr->v6; 5251 break; 5252#endif /* INET6 */ 5253 default: 5254 return (0); 5255 } 5256 5257 /* Skip checks for ipsec interfaces */ 5258 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5259 goto out; 5260 5261 switch (af) { 5262#ifdef INET6 5263 case AF_INET6: 5264 in6_rtalloc_ign(&ro, 0, rtableid); 5265 break; 5266#endif 5267#ifdef INET 5268 case AF_INET: 5269 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5270 break; 5271#endif 5272 default: 5273 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5274 break; 5275 } 5276 5277 if (ro.ro_rt != NULL) { 5278 /* No interface given, this is a no-route check */ 5279 if (kif == NULL) 5280 goto out; 5281 5282 if (kif->pfik_ifp == NULL) { 5283 ret = 0; 5284 goto out; 5285 } 5286 5287 /* Perform uRPF check if passed input interface */ 5288 ret = 0; 5289 rn = (struct radix_node *)ro.ro_rt; 5290 do { 5291 rt = (struct rtentry *)rn; 5292 ifp = rt->rt_ifp; 5293 5294 if (kif->pfik_ifp == ifp) 5295 ret = 1; 5296#ifdef RADIX_MPATH 5297 rn = rn_mpath_next(rn); 5298#endif 5299 } while (check_mpath == 1 && rn != NULL && ret == 0); 5300 } else 5301 ret = 0; 5302out: 5303 if (ro.ro_rt != NULL) 5304 RTFREE(ro.ro_rt); 5305 return (ret); 5306} 5307 5308#ifdef INET 5309static void 5310pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5311 struct pf_state *s, struct pf_pdesc *pd) 5312{ 5313 struct mbuf *m0, *m1; 5314 struct sockaddr_in dst; 5315 struct ip *ip; 5316 struct ifnet *ifp = NULL; 5317 struct pf_addr naddr; 5318 struct pf_src_node *sn = NULL; 5319 int error = 0; 5320 uint16_t ip_len, ip_off; 5321 5322 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5323 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5324 __func__)); 5325 5326 if ((pd->pf_mtag == NULL && 5327 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5328 pd->pf_mtag->routed++ > 3) { 5329 m0 = *m; 5330 *m = NULL; 5331 goto bad_locked; 5332 } 5333 5334 if (r->rt == PF_DUPTO) { 5335 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5336 if (s) 5337 PF_STATE_UNLOCK(s); 5338 return; 5339 } 5340 } else { 5341 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5342 if (s) 5343 PF_STATE_UNLOCK(s); 5344 return; 5345 } 5346 m0 = *m; 5347 } 5348 5349 ip = mtod(m0, struct ip *); 5350 5351 bzero(&dst, sizeof(dst)); 5352 dst.sin_family = AF_INET; 5353 dst.sin_len = sizeof(dst); 5354 dst.sin_addr = ip->ip_dst; 5355 5356 if (r->rt == PF_FASTROUTE) { 5357 struct rtentry *rt; 5358 5359 if (s) 5360 PF_STATE_UNLOCK(s); 5361 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5362 if (rt == NULL) { 5363 KMOD_IPSTAT_INC(ips_noroute); 5364 error = EHOSTUNREACH; 5365 goto bad; 5366 } 5367 5368 ifp = rt->rt_ifp; 5369 counter_u64_add(rt->rt_pksent, 1); 5370 5371 if (rt->rt_flags & RTF_GATEWAY) 5372 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5373 RTFREE_LOCKED(rt); 5374 } else { 5375 if (TAILQ_EMPTY(&r->rpool.list)) { 5376 DPFPRINTF(PF_DEBUG_URGENT, 5377 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5378 goto bad_locked; 5379 } 5380 if (s == NULL) { 5381 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5382 &naddr, NULL, &sn); 5383 if (!PF_AZERO(&naddr, AF_INET)) 5384 dst.sin_addr.s_addr = naddr.v4.s_addr; 5385 ifp = r->rpool.cur->kif ? 5386 r->rpool.cur->kif->pfik_ifp : NULL; 5387 } else { 5388 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5389 dst.sin_addr.s_addr = 5390 s->rt_addr.v4.s_addr; 5391 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5392 PF_STATE_UNLOCK(s); 5393 } 5394 } 5395 if (ifp == NULL) 5396 goto bad; 5397 5398 if (oifp != ifp) { 5399 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5400 goto bad; 5401 else if (m0 == NULL) 5402 goto done; 5403 if (m0->m_len < sizeof(struct ip)) { 5404 DPFPRINTF(PF_DEBUG_URGENT, 5405 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5406 goto bad; 5407 } 5408 ip = mtod(m0, struct ip *); 5409 } 5410 5411 if (ifp->if_flags & IFF_LOOPBACK) 5412 m0->m_flags |= M_SKIP_FIREWALL; 5413 5414 ip_len = ntohs(ip->ip_len); 5415 ip_off = ntohs(ip->ip_off); 5416 5417 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5418 m0->m_pkthdr.csum_flags |= CSUM_IP; 5419 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5420 in_delayed_cksum(m0); 5421 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5422 } 5423#ifdef SCTP 5424 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 5425 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5426 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 5427 } 5428#endif 5429 5430 /* 5431 * If small enough for interface, or the interface will take 5432 * care of the fragmentation for us, we can just send directly. 5433 */ 5434 if (ip_len <= ifp->if_mtu || 5435 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5436 ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5437 ip->ip_sum = 0; 5438 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 5439 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5440 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 5441 } 5442 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 5443 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5444 goto done; 5445 } 5446 5447 /* Balk when DF bit is set or the interface didn't support TSO. */ 5448 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5449 error = EMSGSIZE; 5450 KMOD_IPSTAT_INC(ips_cantfrag); 5451 if (r->rt != PF_DUPTO) { 5452 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5453 ifp->if_mtu); 5454 goto done; 5455 } else 5456 goto bad; 5457 } 5458 5459 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 5460 if (error) 5461 goto bad; 5462 5463 for (; m0; m0 = m1) { 5464 m1 = m0->m_nextpkt; 5465 m0->m_nextpkt = NULL; 5466 if (error == 0) { 5467 m_clrprotoflags(m0); 5468 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5469 } else 5470 m_freem(m0); 5471 } 5472 5473 if (error == 0) 5474 KMOD_IPSTAT_INC(ips_fragmented); 5475 5476done: 5477 if (r->rt != PF_DUPTO) 5478 *m = NULL; 5479 return; 5480 5481bad_locked: 5482 if (s) 5483 PF_STATE_UNLOCK(s); 5484bad: 5485 m_freem(m0); 5486 goto done; 5487} 5488#endif /* INET */ 5489 5490#ifdef INET6 5491static void 5492pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5493 struct pf_state *s, struct pf_pdesc *pd) 5494{ 5495 struct mbuf *m0; 5496 struct sockaddr_in6 dst; 5497 struct ip6_hdr *ip6; 5498 struct ifnet *ifp = NULL; 5499 struct pf_addr naddr; 5500 struct pf_src_node *sn = NULL; 5501 5502 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5503 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5504 __func__)); 5505 5506 if ((pd->pf_mtag == NULL && 5507 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5508 pd->pf_mtag->routed++ > 3) { 5509 m0 = *m; 5510 *m = NULL; 5511 goto bad_locked; 5512 } 5513 5514 if (r->rt == PF_DUPTO) { 5515 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5516 if (s) 5517 PF_STATE_UNLOCK(s); 5518 return; 5519 } 5520 } else { 5521 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5522 if (s) 5523 PF_STATE_UNLOCK(s); 5524 return; 5525 } 5526 m0 = *m; 5527 } 5528 5529 ip6 = mtod(m0, struct ip6_hdr *); 5530 5531 bzero(&dst, sizeof(dst)); 5532 dst.sin6_family = AF_INET6; 5533 dst.sin6_len = sizeof(dst); 5534 dst.sin6_addr = ip6->ip6_dst; 5535 5536 /* Cheat. XXX why only in the v6 case??? */ 5537 if (r->rt == PF_FASTROUTE) { 5538 if (s) 5539 PF_STATE_UNLOCK(s); 5540 m0->m_flags |= M_SKIP_FIREWALL; 5541 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5542 *m = NULL; 5543 return; 5544 } 5545 5546 if (TAILQ_EMPTY(&r->rpool.list)) { 5547 DPFPRINTF(PF_DEBUG_URGENT, 5548 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5549 goto bad_locked; 5550 } 5551 if (s == NULL) { 5552 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5553 &naddr, NULL, &sn); 5554 if (!PF_AZERO(&naddr, AF_INET6)) 5555 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5556 &naddr, AF_INET6); 5557 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5558 } else { 5559 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5560 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5561 &s->rt_addr, AF_INET6); 5562 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5563 } 5564 5565 if (s) 5566 PF_STATE_UNLOCK(s); 5567 5568 if (ifp == NULL) 5569 goto bad; 5570 5571 if (oifp != ifp) { 5572 if (pf_test6(PF_FWD, ifp, &m0, NULL) != PF_PASS) 5573 goto bad; 5574 else if (m0 == NULL) 5575 goto done; 5576 if (m0->m_len < sizeof(struct ip6_hdr)) { 5577 DPFPRINTF(PF_DEBUG_URGENT, 5578 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5579 __func__)); 5580 goto bad; 5581 } 5582 ip6 = mtod(m0, struct ip6_hdr *); 5583 } 5584 5585 if (ifp->if_flags & IFF_LOOPBACK) 5586 m0->m_flags |= M_SKIP_FIREWALL; 5587 5588 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 & 5589 ~ifp->if_hwassist) { 5590 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6); 5591 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr)); 5592 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 5593 } 5594 5595 /* 5596 * If the packet is too large for the outgoing interface, 5597 * send back an icmp6 error. 5598 */ 5599 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5600 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5601 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5602 nd6_output(ifp, ifp, m0, &dst, NULL); 5603 else { 5604 in6_ifstat_inc(ifp, ifs6_in_toobig); 5605 if (r->rt != PF_DUPTO) 5606 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5607 else 5608 goto bad; 5609 } 5610 5611done: 5612 if (r->rt != PF_DUPTO) 5613 *m = NULL; 5614 return; 5615 5616bad_locked: 5617 if (s) 5618 PF_STATE_UNLOCK(s); 5619bad: 5620 m_freem(m0); 5621 goto done; 5622} 5623#endif /* INET6 */ 5624 5625/* 5626 * FreeBSD supports cksum offloads for the following drivers. 5627 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5628 * ti(4), txp(4), xl(4) 5629 * 5630 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5631 * network driver performed cksum including pseudo header, need to verify 5632 * csum_data 5633 * CSUM_DATA_VALID : 5634 * network driver performed cksum, needs to additional pseudo header 5635 * cksum computation with partial csum_data(i.e. lack of H/W support for 5636 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5637 * 5638 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5639 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5640 * TCP/UDP layer. 5641 * Also, set csum_data to 0xffff to force cksum validation. 5642 */ 5643static int 5644pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5645{ 5646 u_int16_t sum = 0; 5647 int hw_assist = 0; 5648 struct ip *ip; 5649 5650 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5651 return (1); 5652 if (m->m_pkthdr.len < off + len) 5653 return (1); 5654 5655 switch (p) { 5656 case IPPROTO_TCP: 5657 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5658 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5659 sum = m->m_pkthdr.csum_data; 5660 } else { 5661 ip = mtod(m, struct ip *); 5662 sum = in_pseudo(ip->ip_src.s_addr, 5663 ip->ip_dst.s_addr, htonl((u_short)len + 5664 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5665 } 5666 sum ^= 0xffff; 5667 ++hw_assist; 5668 } 5669 break; 5670 case IPPROTO_UDP: 5671 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5672 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5673 sum = m->m_pkthdr.csum_data; 5674 } else { 5675 ip = mtod(m, struct ip *); 5676 sum = in_pseudo(ip->ip_src.s_addr, 5677 ip->ip_dst.s_addr, htonl((u_short)len + 5678 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5679 } 5680 sum ^= 0xffff; 5681 ++hw_assist; 5682 } 5683 break; 5684 case IPPROTO_ICMP: 5685#ifdef INET6 5686 case IPPROTO_ICMPV6: 5687#endif /* INET6 */ 5688 break; 5689 default: 5690 return (1); 5691 } 5692 5693 if (!hw_assist) { 5694 switch (af) { 5695 case AF_INET: 5696 if (p == IPPROTO_ICMP) { 5697 if (m->m_len < off) 5698 return (1); 5699 m->m_data += off; 5700 m->m_len -= off; 5701 sum = in_cksum(m, len); 5702 m->m_data -= off; 5703 m->m_len += off; 5704 } else { 5705 if (m->m_len < sizeof(struct ip)) 5706 return (1); 5707 sum = in4_cksum(m, p, off, len); 5708 } 5709 break; 5710#ifdef INET6 5711 case AF_INET6: 5712 if (m->m_len < sizeof(struct ip6_hdr)) 5713 return (1); 5714 sum = in6_cksum(m, p, off, len); 5715 break; 5716#endif /* INET6 */ 5717 default: 5718 return (1); 5719 } 5720 } 5721 if (sum) { 5722 switch (p) { 5723 case IPPROTO_TCP: 5724 { 5725 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5726 break; 5727 } 5728 case IPPROTO_UDP: 5729 { 5730 KMOD_UDPSTAT_INC(udps_badsum); 5731 break; 5732 } 5733#ifdef INET 5734 case IPPROTO_ICMP: 5735 { 5736 KMOD_ICMPSTAT_INC(icps_checksum); 5737 break; 5738 } 5739#endif 5740#ifdef INET6 5741 case IPPROTO_ICMPV6: 5742 { 5743 KMOD_ICMP6STAT_INC(icp6s_checksum); 5744 break; 5745 } 5746#endif /* INET6 */ 5747 } 5748 return (1); 5749 } else { 5750 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5751 m->m_pkthdr.csum_flags |= 5752 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5753 m->m_pkthdr.csum_data = 0xffff; 5754 } 5755 } 5756 return (0); 5757} 5758 5759 5760#ifdef INET 5761int 5762pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5763{ 5764 struct pfi_kif *kif; 5765 u_short action, reason = 0, log = 0; 5766 struct mbuf *m = *m0; 5767 struct ip *h = NULL; 5768 struct m_tag *ipfwtag; 5769 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5770 struct pf_state *s = NULL; 5771 struct pf_ruleset *ruleset = NULL; 5772 struct pf_pdesc pd; 5773 int off, dirndx, pqid = 0; 5774 5775 M_ASSERTPKTHDR(m); 5776 5777 if (!V_pf_status.running) 5778 return (PF_PASS); 5779 5780 memset(&pd, 0, sizeof(pd)); 5781 5782 kif = (struct pfi_kif *)ifp->if_pf_kif; 5783 5784 if (kif == NULL) { 5785 DPFPRINTF(PF_DEBUG_URGENT, 5786 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5787 return (PF_DROP); 5788 } 5789 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5790 return (PF_PASS); 5791 5792 if (m->m_flags & M_SKIP_FIREWALL) 5793 return (PF_PASS); 5794 5795 pd.pf_mtag = pf_find_mtag(m); 5796 5797 PF_RULES_RLOCK(); 5798 5799 if (ip_divert_ptr != NULL && 5800 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5801 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5802 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5803 if (pd.pf_mtag == NULL && 5804 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5805 action = PF_DROP; 5806 goto done; 5807 } 5808 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5809 m_tag_delete(m, ipfwtag); 5810 } 5811 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5812 m->m_flags |= M_FASTFWD_OURS; 5813 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5814 } 5815 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5816 /* We do IP header normalization and packet reassembly here */ 5817 action = PF_DROP; 5818 goto done; 5819 } 5820 m = *m0; /* pf_normalize messes with m0 */ 5821 h = mtod(m, struct ip *); 5822 5823 off = h->ip_hl << 2; 5824 if (off < (int)sizeof(struct ip)) { 5825 action = PF_DROP; 5826 REASON_SET(&reason, PFRES_SHORT); 5827 log = 1; 5828 goto done; 5829 } 5830 5831 pd.src = (struct pf_addr *)&h->ip_src; 5832 pd.dst = (struct pf_addr *)&h->ip_dst; 5833 pd.sport = pd.dport = NULL; 5834 pd.ip_sum = &h->ip_sum; 5835 pd.proto_sum = NULL; 5836 pd.proto = h->ip_p; 5837 pd.dir = dir; 5838 pd.sidx = (dir == PF_IN) ? 0 : 1; 5839 pd.didx = (dir == PF_IN) ? 1 : 0; 5840 pd.af = AF_INET; 5841 pd.tos = h->ip_tos; 5842 pd.tot_len = ntohs(h->ip_len); 5843 5844 /* handle fragments that didn't get reassembled by normalization */ 5845 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5846 action = pf_test_fragment(&r, dir, kif, m, h, 5847 &pd, &a, &ruleset); 5848 goto done; 5849 } 5850 5851 switch (h->ip_p) { 5852 5853 case IPPROTO_TCP: { 5854 struct tcphdr th; 5855 5856 pd.hdr.tcp = &th; 5857 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5858 &action, &reason, AF_INET)) { 5859 log = action != PF_PASS; 5860 goto done; 5861 } 5862 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5863 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5864 pqid = 1; 5865 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5866 if (action == PF_DROP) 5867 goto done; 5868 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5869 &reason); 5870 if (action == PF_PASS) { 5871 if (pfsync_update_state_ptr != NULL) 5872 pfsync_update_state_ptr(s); 5873 r = s->rule.ptr; 5874 a = s->anchor.ptr; 5875 log = s->log; 5876 } else if (s == NULL) 5877 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5878 &a, &ruleset, inp); 5879 break; 5880 } 5881 5882 case IPPROTO_UDP: { 5883 struct udphdr uh; 5884 5885 pd.hdr.udp = &uh; 5886 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5887 &action, &reason, AF_INET)) { 5888 log = action != PF_PASS; 5889 goto done; 5890 } 5891 if (uh.uh_dport == 0 || 5892 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5893 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5894 action = PF_DROP; 5895 REASON_SET(&reason, PFRES_SHORT); 5896 goto done; 5897 } 5898 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5899 if (action == PF_PASS) { 5900 if (pfsync_update_state_ptr != NULL) 5901 pfsync_update_state_ptr(s); 5902 r = s->rule.ptr; 5903 a = s->anchor.ptr; 5904 log = s->log; 5905 } else if (s == NULL) 5906 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5907 &a, &ruleset, inp); 5908 break; 5909 } 5910 5911 case IPPROTO_ICMP: { 5912 struct icmp ih; 5913 5914 pd.hdr.icmp = &ih; 5915 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5916 &action, &reason, AF_INET)) { 5917 log = action != PF_PASS; 5918 goto done; 5919 } 5920 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5921 &reason); 5922 if (action == PF_PASS) { 5923 if (pfsync_update_state_ptr != NULL) 5924 pfsync_update_state_ptr(s); 5925 r = s->rule.ptr; 5926 a = s->anchor.ptr; 5927 log = s->log; 5928 } else if (s == NULL) 5929 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5930 &a, &ruleset, inp); 5931 break; 5932 } 5933 5934#ifdef INET6 5935 case IPPROTO_ICMPV6: { 5936 action = PF_DROP; 5937 DPFPRINTF(PF_DEBUG_MISC, 5938 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5939 goto done; 5940 } 5941#endif 5942 5943 default: 5944 action = pf_test_state_other(&s, dir, kif, m, &pd); 5945 if (action == PF_PASS) { 5946 if (pfsync_update_state_ptr != NULL) 5947 pfsync_update_state_ptr(s); 5948 r = s->rule.ptr; 5949 a = s->anchor.ptr; 5950 log = s->log; 5951 } else if (s == NULL) 5952 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5953 &a, &ruleset, inp); 5954 break; 5955 } 5956 5957done: 5958 PF_RULES_RUNLOCK(); 5959 if (action == PF_PASS && h->ip_hl > 5 && 5960 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 5961 action = PF_DROP; 5962 REASON_SET(&reason, PFRES_IPOPTIONS); 5963 log = r->log; 5964 DPFPRINTF(PF_DEBUG_MISC, 5965 ("pf: dropping packet with ip options\n")); 5966 } 5967 5968 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 5969 action = PF_DROP; 5970 REASON_SET(&reason, PFRES_MEMORY); 5971 } 5972 if (r->rtableid >= 0) 5973 M_SETFIB(m, r->rtableid); 5974 5975#ifdef ALTQ 5976 if (action == PF_PASS && r->qid) { 5977 if (pd.pf_mtag == NULL && 5978 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5979 action = PF_DROP; 5980 REASON_SET(&reason, PFRES_MEMORY); 5981 } else { 5982 if (s != NULL) 5983 pd.pf_mtag->qid_hash = pf_state_hash(s); 5984 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5985 pd.pf_mtag->qid = r->pqid; 5986 else 5987 pd.pf_mtag->qid = r->qid; 5988 /* Add hints for ecn. */ 5989 pd.pf_mtag->hdr = h; 5990 } 5991 5992 } 5993#endif /* ALTQ */ 5994 5995 /* 5996 * connections redirected to loopback should not match sockets 5997 * bound specifically to loopback due to security implications, 5998 * see tcp_input() and in_pcblookup_listen(). 5999 */ 6000 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6001 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6002 (s->nat_rule.ptr->action == PF_RDR || 6003 s->nat_rule.ptr->action == PF_BINAT) && 6004 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 6005 m->m_flags |= M_SKIP_FIREWALL; 6006 6007 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 6008 !PACKET_LOOPED(&pd)) { 6009 6010 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 6011 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 6012 if (ipfwtag != NULL) { 6013 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 6014 ntohs(r->divert.port); 6015 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 6016 6017 if (s) 6018 PF_STATE_UNLOCK(s); 6019 6020 m_tag_prepend(m, ipfwtag); 6021 if (m->m_flags & M_FASTFWD_OURS) { 6022 if (pd.pf_mtag == NULL && 6023 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6024 action = PF_DROP; 6025 REASON_SET(&reason, PFRES_MEMORY); 6026 log = 1; 6027 DPFPRINTF(PF_DEBUG_MISC, 6028 ("pf: failed to allocate tag\n")); 6029 } else { 6030 pd.pf_mtag->flags |= 6031 PF_FASTFWD_OURS_PRESENT; 6032 m->m_flags &= ~M_FASTFWD_OURS; 6033 } 6034 } 6035 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 6036 *m0 = NULL; 6037 6038 return (action); 6039 } else { 6040 /* XXX: ipfw has the same behaviour! */ 6041 action = PF_DROP; 6042 REASON_SET(&reason, PFRES_MEMORY); 6043 log = 1; 6044 DPFPRINTF(PF_DEBUG_MISC, 6045 ("pf: failed to allocate divert tag\n")); 6046 } 6047 } 6048 6049 if (log) { 6050 struct pf_rule *lr; 6051 6052 if (s != NULL && s->nat_rule.ptr != NULL && 6053 s->nat_rule.ptr->log & PF_LOG_ALL) 6054 lr = s->nat_rule.ptr; 6055 else 6056 lr = r; 6057 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 6058 (s == NULL)); 6059 } 6060 6061 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6062 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 6063 6064 if (action == PF_PASS || r->action == PF_DROP) { 6065 dirndx = (dir == PF_OUT); 6066 r->packets[dirndx]++; 6067 r->bytes[dirndx] += pd.tot_len; 6068 if (a != NULL) { 6069 a->packets[dirndx]++; 6070 a->bytes[dirndx] += pd.tot_len; 6071 } 6072 if (s != NULL) { 6073 if (s->nat_rule.ptr != NULL) { 6074 s->nat_rule.ptr->packets[dirndx]++; 6075 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6076 } 6077 if (s->src_node != NULL) { 6078 s->src_node->packets[dirndx]++; 6079 s->src_node->bytes[dirndx] += pd.tot_len; 6080 } 6081 if (s->nat_src_node != NULL) { 6082 s->nat_src_node->packets[dirndx]++; 6083 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6084 } 6085 dirndx = (dir == s->direction) ? 0 : 1; 6086 s->packets[dirndx]++; 6087 s->bytes[dirndx] += pd.tot_len; 6088 } 6089 tr = r; 6090 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6091 if (nr != NULL && r == &V_pf_default_rule) 6092 tr = nr; 6093 if (tr->src.addr.type == PF_ADDR_TABLE) 6094 pfr_update_stats(tr->src.addr.p.tbl, 6095 (s == NULL) ? pd.src : 6096 &s->key[(s->direction == PF_IN)]-> 6097 addr[(s->direction == PF_OUT)], 6098 pd.af, pd.tot_len, dir == PF_OUT, 6099 r->action == PF_PASS, tr->src.neg); 6100 if (tr->dst.addr.type == PF_ADDR_TABLE) 6101 pfr_update_stats(tr->dst.addr.p.tbl, 6102 (s == NULL) ? pd.dst : 6103 &s->key[(s->direction == PF_IN)]-> 6104 addr[(s->direction == PF_IN)], 6105 pd.af, pd.tot_len, dir == PF_OUT, 6106 r->action == PF_PASS, tr->dst.neg); 6107 } 6108 6109 switch (action) { 6110 case PF_SYNPROXY_DROP: 6111 m_freem(*m0); 6112 case PF_DEFER: 6113 *m0 = NULL; 6114 action = PF_PASS; 6115 break; 6116 case PF_DROP: 6117 m_freem(*m0); 6118 *m0 = NULL; 6119 break; 6120 default: 6121 /* pf_route() returns unlocked. */ 6122 if (r->rt) { 6123 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6124 return (action); 6125 } 6126 break; 6127 } 6128 if (s) 6129 PF_STATE_UNLOCK(s); 6130 6131 return (action); 6132} 6133#endif /* INET */ 6134 6135#ifdef INET6 6136int 6137pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6138{ 6139 struct pfi_kif *kif; 6140 u_short action, reason = 0, log = 0; 6141 struct mbuf *m = *m0, *n = NULL; 6142 struct m_tag *mtag; 6143 struct ip6_hdr *h = NULL; 6144 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6145 struct pf_state *s = NULL; 6146 struct pf_ruleset *ruleset = NULL; 6147 struct pf_pdesc pd; 6148 int off, terminal = 0, dirndx, rh_cnt = 0; 6149 int fwdir = dir; 6150 6151 M_ASSERTPKTHDR(m); 6152 6153 /* Detect packet forwarding. 6154 * If the input interface is different from the output interface we're 6155 * forwarding. 6156 * We do need to be careful about bridges. If the 6157 * net.link.bridge.pfil_bridge sysctl is set we can be filtering on a 6158 * bridge, so if the input interface is a bridge member and the output 6159 * interface is its bridge or a member of the same bridge we're not 6160 * actually forwarding but bridging. 6161 */ 6162 if (dir == PF_OUT && m->m_pkthdr.rcvif && ifp != m->m_pkthdr.rcvif && 6163 (m->m_pkthdr.rcvif->if_bridge == NULL || 6164 (m->m_pkthdr.rcvif->if_bridge != ifp->if_softc && 6165 m->m_pkthdr.rcvif->if_bridge != ifp->if_bridge))) 6166 fwdir = PF_FWD; 6167 6168 if (dir == PF_FWD) 6169 dir = PF_OUT; 6170 6171 if (!V_pf_status.running) 6172 return (PF_PASS); 6173 6174 memset(&pd, 0, sizeof(pd)); 6175 pd.pf_mtag = pf_find_mtag(m); 6176 6177 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6178 return (PF_PASS); 6179 6180 kif = (struct pfi_kif *)ifp->if_pf_kif; 6181 if (kif == NULL) { 6182 DPFPRINTF(PF_DEBUG_URGENT, 6183 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6184 return (PF_DROP); 6185 } 6186 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6187 return (PF_PASS); 6188 6189 if (m->m_flags & M_SKIP_FIREWALL) 6190 return (PF_PASS); 6191 6192 PF_RULES_RLOCK(); 6193 6194 /* We do IP header normalization and packet reassembly here */ 6195 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6196 action = PF_DROP; 6197 goto done; 6198 } 6199 m = *m0; /* pf_normalize messes with m0 */ 6200 h = mtod(m, struct ip6_hdr *); 6201 6202#if 1 6203 /* 6204 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6205 * will do something bad, so drop the packet for now. 6206 */ 6207 if (htons(h->ip6_plen) == 0) { 6208 action = PF_DROP; 6209 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6210 goto done; 6211 } 6212#endif 6213 6214 pd.src = (struct pf_addr *)&h->ip6_src; 6215 pd.dst = (struct pf_addr *)&h->ip6_dst; 6216 pd.sport = pd.dport = NULL; 6217 pd.ip_sum = NULL; 6218 pd.proto_sum = NULL; 6219 pd.dir = dir; 6220 pd.sidx = (dir == PF_IN) ? 0 : 1; 6221 pd.didx = (dir == PF_IN) ? 1 : 0; 6222 pd.af = AF_INET6; 6223 pd.tos = 0; 6224 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6225 6226 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6227 pd.proto = h->ip6_nxt; 6228 do { 6229 switch (pd.proto) { 6230 case IPPROTO_FRAGMENT: 6231 action = pf_test_fragment(&r, dir, kif, m, h, 6232 &pd, &a, &ruleset); 6233 if (action == PF_DROP) 6234 REASON_SET(&reason, PFRES_FRAG); 6235 goto done; 6236 case IPPROTO_ROUTING: { 6237 struct ip6_rthdr rthdr; 6238 6239 if (rh_cnt++) { 6240 DPFPRINTF(PF_DEBUG_MISC, 6241 ("pf: IPv6 more than one rthdr\n")); 6242 action = PF_DROP; 6243 REASON_SET(&reason, PFRES_IPOPTIONS); 6244 log = 1; 6245 goto done; 6246 } 6247 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6248 &reason, pd.af)) { 6249 DPFPRINTF(PF_DEBUG_MISC, 6250 ("pf: IPv6 short rthdr\n")); 6251 action = PF_DROP; 6252 REASON_SET(&reason, PFRES_SHORT); 6253 log = 1; 6254 goto done; 6255 } 6256 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6257 DPFPRINTF(PF_DEBUG_MISC, 6258 ("pf: IPv6 rthdr0\n")); 6259 action = PF_DROP; 6260 REASON_SET(&reason, PFRES_IPOPTIONS); 6261 log = 1; 6262 goto done; 6263 } 6264 /* FALLTHROUGH */ 6265 } 6266 case IPPROTO_AH: 6267 case IPPROTO_HOPOPTS: 6268 case IPPROTO_DSTOPTS: { 6269 /* get next header and header length */ 6270 struct ip6_ext opt6; 6271 6272 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6273 NULL, &reason, pd.af)) { 6274 DPFPRINTF(PF_DEBUG_MISC, 6275 ("pf: IPv6 short opt\n")); 6276 action = PF_DROP; 6277 log = 1; 6278 goto done; 6279 } 6280 if (pd.proto == IPPROTO_AH) 6281 off += (opt6.ip6e_len + 2) * 4; 6282 else 6283 off += (opt6.ip6e_len + 1) * 8; 6284 pd.proto = opt6.ip6e_nxt; 6285 /* goto the next header */ 6286 break; 6287 } 6288 default: 6289 terminal++; 6290 break; 6291 } 6292 } while (!terminal); 6293 6294 /* if there's no routing header, use unmodified mbuf for checksumming */ 6295 if (!n) 6296 n = m; 6297 6298 switch (pd.proto) { 6299 6300 case IPPROTO_TCP: { 6301 struct tcphdr th; 6302 6303 pd.hdr.tcp = &th; 6304 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6305 &action, &reason, AF_INET6)) { 6306 log = action != PF_PASS; 6307 goto done; 6308 } 6309 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6310 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6311 if (action == PF_DROP) 6312 goto done; 6313 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6314 &reason); 6315 if (action == PF_PASS) { 6316 if (pfsync_update_state_ptr != NULL) 6317 pfsync_update_state_ptr(s); 6318 r = s->rule.ptr; 6319 a = s->anchor.ptr; 6320 log = s->log; 6321 } else if (s == NULL) 6322 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6323 &a, &ruleset, inp); 6324 break; 6325 } 6326 6327 case IPPROTO_UDP: { 6328 struct udphdr uh; 6329 6330 pd.hdr.udp = &uh; 6331 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6332 &action, &reason, AF_INET6)) { 6333 log = action != PF_PASS; 6334 goto done; 6335 } 6336 if (uh.uh_dport == 0 || 6337 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6338 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6339 action = PF_DROP; 6340 REASON_SET(&reason, PFRES_SHORT); 6341 goto done; 6342 } 6343 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6344 if (action == PF_PASS) { 6345 if (pfsync_update_state_ptr != NULL) 6346 pfsync_update_state_ptr(s); 6347 r = s->rule.ptr; 6348 a = s->anchor.ptr; 6349 log = s->log; 6350 } else if (s == NULL) 6351 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6352 &a, &ruleset, inp); 6353 break; 6354 } 6355 6356 case IPPROTO_ICMP: { 6357 action = PF_DROP; 6358 DPFPRINTF(PF_DEBUG_MISC, 6359 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6360 goto done; 6361 } 6362 6363 case IPPROTO_ICMPV6: { 6364 struct icmp6_hdr ih; 6365 6366 pd.hdr.icmp6 = &ih; 6367 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6368 &action, &reason, AF_INET6)) { 6369 log = action != PF_PASS; 6370 goto done; 6371 } 6372 action = pf_test_state_icmp(&s, dir, kif, 6373 m, off, h, &pd, &reason); 6374 if (action == PF_PASS) { 6375 if (pfsync_update_state_ptr != NULL) 6376 pfsync_update_state_ptr(s); 6377 r = s->rule.ptr; 6378 a = s->anchor.ptr; 6379 log = s->log; 6380 } else if (s == NULL) 6381 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6382 &a, &ruleset, inp); 6383 break; 6384 } 6385 6386 default: 6387 action = pf_test_state_other(&s, dir, kif, m, &pd); 6388 if (action == PF_PASS) { 6389 if (pfsync_update_state_ptr != NULL) 6390 pfsync_update_state_ptr(s); 6391 r = s->rule.ptr; 6392 a = s->anchor.ptr; 6393 log = s->log; 6394 } else if (s == NULL) 6395 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6396 &a, &ruleset, inp); 6397 break; 6398 } 6399 6400done: 6401 PF_RULES_RUNLOCK(); 6402 if (n != m) { 6403 m_freem(n); 6404 n = NULL; 6405 } 6406 6407 /* handle dangerous IPv6 extension headers. */ 6408 if (action == PF_PASS && rh_cnt && 6409 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6410 action = PF_DROP; 6411 REASON_SET(&reason, PFRES_IPOPTIONS); 6412 log = r->log; 6413 DPFPRINTF(PF_DEBUG_MISC, 6414 ("pf: dropping packet with dangerous v6 headers\n")); 6415 } 6416 6417 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6418 action = PF_DROP; 6419 REASON_SET(&reason, PFRES_MEMORY); 6420 } 6421 if (r->rtableid >= 0) 6422 M_SETFIB(m, r->rtableid); 6423 6424#ifdef ALTQ 6425 if (action == PF_PASS && r->qid) { 6426 if (pd.pf_mtag == NULL && 6427 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6428 action = PF_DROP; 6429 REASON_SET(&reason, PFRES_MEMORY); 6430 } else { 6431 if (s != NULL) 6432 pd.pf_mtag->qid_hash = pf_state_hash(s); 6433 if (pd.tos & IPTOS_LOWDELAY) 6434 pd.pf_mtag->qid = r->pqid; 6435 else 6436 pd.pf_mtag->qid = r->qid; 6437 /* Add hints for ecn. */ 6438 pd.pf_mtag->hdr = h; 6439 } 6440 } 6441#endif /* ALTQ */ 6442 6443 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6444 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6445 (s->nat_rule.ptr->action == PF_RDR || 6446 s->nat_rule.ptr->action == PF_BINAT) && 6447 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6448 m->m_flags |= M_SKIP_FIREWALL; 6449 6450 /* XXX: Anybody working on it?! */ 6451 if (r->divert.port) 6452 printf("pf: divert(9) is not supported for IPv6\n"); 6453 6454 if (log) { 6455 struct pf_rule *lr; 6456 6457 if (s != NULL && s->nat_rule.ptr != NULL && 6458 s->nat_rule.ptr->log & PF_LOG_ALL) 6459 lr = s->nat_rule.ptr; 6460 else 6461 lr = r; 6462 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6463 &pd, (s == NULL)); 6464 } 6465 6466 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6467 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6468 6469 if (action == PF_PASS || r->action == PF_DROP) { 6470 dirndx = (dir == PF_OUT); 6471 r->packets[dirndx]++; 6472 r->bytes[dirndx] += pd.tot_len; 6473 if (a != NULL) { 6474 a->packets[dirndx]++; 6475 a->bytes[dirndx] += pd.tot_len; 6476 } 6477 if (s != NULL) { 6478 if (s->nat_rule.ptr != NULL) { 6479 s->nat_rule.ptr->packets[dirndx]++; 6480 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6481 } 6482 if (s->src_node != NULL) { 6483 s->src_node->packets[dirndx]++; 6484 s->src_node->bytes[dirndx] += pd.tot_len; 6485 } 6486 if (s->nat_src_node != NULL) { 6487 s->nat_src_node->packets[dirndx]++; 6488 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6489 } 6490 dirndx = (dir == s->direction) ? 0 : 1; 6491 s->packets[dirndx]++; 6492 s->bytes[dirndx] += pd.tot_len; 6493 } 6494 tr = r; 6495 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6496 if (nr != NULL && r == &V_pf_default_rule) 6497 tr = nr; 6498 if (tr->src.addr.type == PF_ADDR_TABLE) 6499 pfr_update_stats(tr->src.addr.p.tbl, 6500 (s == NULL) ? pd.src : 6501 &s->key[(s->direction == PF_IN)]->addr[0], 6502 pd.af, pd.tot_len, dir == PF_OUT, 6503 r->action == PF_PASS, tr->src.neg); 6504 if (tr->dst.addr.type == PF_ADDR_TABLE) 6505 pfr_update_stats(tr->dst.addr.p.tbl, 6506 (s == NULL) ? pd.dst : 6507 &s->key[(s->direction == PF_IN)]->addr[1], 6508 pd.af, pd.tot_len, dir == PF_OUT, 6509 r->action == PF_PASS, tr->dst.neg); 6510 } 6511 6512 switch (action) { 6513 case PF_SYNPROXY_DROP: 6514 m_freem(*m0); 6515 case PF_DEFER: 6516 *m0 = NULL; 6517 action = PF_PASS; 6518 break; 6519 case PF_DROP: 6520 m_freem(*m0); 6521 *m0 = NULL; 6522 break; 6523 default: 6524 /* pf_route6() returns unlocked. */ 6525 if (r->rt) { 6526 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6527 return (action); 6528 } 6529 break; 6530 } 6531 6532 if (s) 6533 PF_STATE_UNLOCK(s); 6534 6535 /* If reassembled packet passed, create new fragments. */ 6536 if (action == PF_PASS && *m0 && fwdir == PF_FWD && 6537 (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL) 6538 action = pf_refragment6(ifp, m0, mtag); 6539 6540 return (action); 6541} 6542#endif /* INET6 */ 6543