pf.c revision 285941
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 285941 2015-07-28 09:16:54Z glebius $"); 40 41#include "opt_inet.h" 42#include "opt_inet6.h" 43#include "opt_bpf.h" 44#include "opt_pf.h" 45 46#include <sys/param.h> 47#include <sys/bus.h> 48#include <sys/endian.h> 49#include <sys/hash.h> 50#include <sys/interrupt.h> 51#include <sys/kernel.h> 52#include <sys/kthread.h> 53#include <sys/limits.h> 54#include <sys/mbuf.h> 55#include <sys/md5.h> 56#include <sys/random.h> 57#include <sys/refcount.h> 58#include <sys/socket.h> 59#include <sys/sysctl.h> 60#include <sys/taskqueue.h> 61#include <sys/ucred.h> 62 63#include <net/if.h> 64#include <net/if_types.h> 65#include <net/route.h> 66#include <net/radix_mpath.h> 67#include <net/vnet.h> 68 69#include <net/pfvar.h> 70#include <net/if_pflog.h> 71#include <net/if_pfsync.h> 72 73#include <netinet/in_pcb.h> 74#include <netinet/in_var.h> 75#include <netinet/ip.h> 76#include <netinet/ip_fw.h> 77#include <netinet/ip_icmp.h> 78#include <netinet/icmp_var.h> 79#include <netinet/ip_var.h> 80#include <netinet/tcp.h> 81#include <netinet/tcp_fsm.h> 82#include <netinet/tcp_seq.h> 83#include <netinet/tcp_timer.h> 84#include <netinet/tcp_var.h> 85#include <netinet/udp.h> 86#include <netinet/udp_var.h> 87 88#include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */ 89 90#ifdef INET6 91#include <netinet/ip6.h> 92#include <netinet/icmp6.h> 93#include <netinet6/nd6.h> 94#include <netinet6/ip6_var.h> 95#include <netinet6/in6_pcb.h> 96#endif /* INET6 */ 97 98#include <machine/in_cksum.h> 99#include <security/mac/mac_framework.h> 100 101#define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 102 103/* 104 * Global variables 105 */ 106 107/* state tables */ 108VNET_DEFINE(struct pf_altqqueue, pf_altqs[2]); 109VNET_DEFINE(struct pf_palist, pf_pabuf); 110VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 111VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 112VNET_DEFINE(struct pf_kstatus, pf_status); 113 114VNET_DEFINE(u_int32_t, ticket_altqs_active); 115VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 116VNET_DEFINE(int, altqs_inactive_open); 117VNET_DEFINE(u_int32_t, ticket_pabuf); 118 119VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 120#define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 121VNET_DEFINE(u_char, pf_tcp_secret[16]); 122#define V_pf_tcp_secret VNET(pf_tcp_secret) 123VNET_DEFINE(int, pf_tcp_secret_init); 124#define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 125VNET_DEFINE(int, pf_tcp_iss_off); 126#define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 127 128/* 129 * Queue for pf_intr() sends. 130 */ 131static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 132struct pf_send_entry { 133 STAILQ_ENTRY(pf_send_entry) pfse_next; 134 struct mbuf *pfse_m; 135 enum { 136 PFSE_IP, 137 PFSE_IP6, 138 PFSE_ICMP, 139 PFSE_ICMP6, 140 } pfse_type; 141 union { 142 struct route ro; 143 struct { 144 int type; 145 int code; 146 int mtu; 147 } icmpopts; 148 } u; 149#define pfse_ro u.ro 150#define pfse_icmp_type u.icmpopts.type 151#define pfse_icmp_code u.icmpopts.code 152#define pfse_icmp_mtu u.icmpopts.mtu 153}; 154 155STAILQ_HEAD(pf_send_head, pf_send_entry); 156static VNET_DEFINE(struct pf_send_head, pf_sendqueue); 157#define V_pf_sendqueue VNET(pf_sendqueue) 158 159static struct mtx pf_sendqueue_mtx; 160#define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 161#define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 162 163/* 164 * Queue for pf_overload_task() tasks. 165 */ 166struct pf_overload_entry { 167 SLIST_ENTRY(pf_overload_entry) next; 168 struct pf_addr addr; 169 sa_family_t af; 170 uint8_t dir; 171 struct pf_rule *rule; 172}; 173 174SLIST_HEAD(pf_overload_head, pf_overload_entry); 175static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue); 176#define V_pf_overloadqueue VNET(pf_overloadqueue) 177static VNET_DEFINE(struct task, pf_overloadtask); 178#define V_pf_overloadtask VNET(pf_overloadtask) 179 180static struct mtx pf_overloadqueue_mtx; 181#define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) 182#define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) 183 184VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules); 185struct mtx pf_unlnkdrules_mtx; 186 187static VNET_DEFINE(uma_zone_t, pf_sources_z); 188#define V_pf_sources_z VNET(pf_sources_z) 189uma_zone_t pf_mtag_z; 190VNET_DEFINE(uma_zone_t, pf_state_z); 191VNET_DEFINE(uma_zone_t, pf_state_key_z); 192 193VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]); 194#define PFID_CPUBITS 8 195#define PFID_CPUSHIFT (sizeof(uint64_t) * NBBY - PFID_CPUBITS) 196#define PFID_CPUMASK ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT) 197#define PFID_MAXID (~PFID_CPUMASK) 198CTASSERT((1 << PFID_CPUBITS) >= MAXCPU); 199 200static void pf_src_tree_remove_state(struct pf_state *); 201static void pf_init_threshold(struct pf_threshold *, u_int32_t, 202 u_int32_t); 203static void pf_add_threshold(struct pf_threshold *); 204static int pf_check_threshold(struct pf_threshold *); 205 206static void pf_change_ap(struct pf_addr *, u_int16_t *, 207 u_int16_t *, u_int16_t *, struct pf_addr *, 208 u_int16_t, u_int8_t, sa_family_t); 209static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 210 struct tcphdr *, struct pf_state_peer *); 211static void pf_change_icmp(struct pf_addr *, u_int16_t *, 212 struct pf_addr *, struct pf_addr *, u_int16_t, 213 u_int16_t *, u_int16_t *, u_int16_t *, 214 u_int16_t *, u_int8_t, sa_family_t); 215static void pf_send_tcp(struct mbuf *, 216 const struct pf_rule *, sa_family_t, 217 const struct pf_addr *, const struct pf_addr *, 218 u_int16_t, u_int16_t, u_int32_t, u_int32_t, 219 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 220 u_int16_t, struct ifnet *); 221static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 222 sa_family_t, struct pf_rule *); 223static void pf_detach_state(struct pf_state *); 224static int pf_state_key_attach(struct pf_state_key *, 225 struct pf_state_key *, struct pf_state *); 226static void pf_state_key_detach(struct pf_state *, int); 227static int pf_state_key_ctor(void *, int, void *, int); 228static u_int32_t pf_tcp_iss(struct pf_pdesc *); 229static int pf_test_rule(struct pf_rule **, struct pf_state **, 230 int, struct pfi_kif *, struct mbuf *, int, 231 struct pf_pdesc *, struct pf_rule **, 232 struct pf_ruleset **, struct inpcb *); 233static int pf_create_state(struct pf_rule *, struct pf_rule *, 234 struct pf_rule *, struct pf_pdesc *, 235 struct pf_src_node *, struct pf_state_key *, 236 struct pf_state_key *, struct mbuf *, int, 237 u_int16_t, u_int16_t, int *, struct pfi_kif *, 238 struct pf_state **, int, u_int16_t, u_int16_t, 239 int); 240static int pf_test_fragment(struct pf_rule **, int, 241 struct pfi_kif *, struct mbuf *, void *, 242 struct pf_pdesc *, struct pf_rule **, 243 struct pf_ruleset **); 244static int pf_tcp_track_full(struct pf_state_peer *, 245 struct pf_state_peer *, struct pf_state **, 246 struct pfi_kif *, struct mbuf *, int, 247 struct pf_pdesc *, u_short *, int *); 248static int pf_tcp_track_sloppy(struct pf_state_peer *, 249 struct pf_state_peer *, struct pf_state **, 250 struct pf_pdesc *, u_short *); 251static int pf_test_state_tcp(struct pf_state **, int, 252 struct pfi_kif *, struct mbuf *, int, 253 void *, struct pf_pdesc *, u_short *); 254static int pf_test_state_udp(struct pf_state **, int, 255 struct pfi_kif *, struct mbuf *, int, 256 void *, struct pf_pdesc *); 257static int pf_test_state_icmp(struct pf_state **, int, 258 struct pfi_kif *, struct mbuf *, int, 259 void *, struct pf_pdesc *, u_short *); 260static int pf_test_state_other(struct pf_state **, int, 261 struct pfi_kif *, struct mbuf *, struct pf_pdesc *); 262static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 263 sa_family_t); 264static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 265 sa_family_t); 266static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 267 int, u_int16_t); 268static int pf_check_proto_cksum(struct mbuf *, int, int, 269 u_int8_t, sa_family_t); 270static void pf_print_state_parts(struct pf_state *, 271 struct pf_state_key *, struct pf_state_key *); 272static int pf_addr_wrap_neq(struct pf_addr_wrap *, 273 struct pf_addr_wrap *); 274static struct pf_state *pf_find_state(struct pfi_kif *, 275 struct pf_state_key_cmp *, u_int); 276static int pf_src_connlimit(struct pf_state **); 277static void pf_overload_task(void *v, int pending); 278static int pf_insert_src_node(struct pf_src_node **, 279 struct pf_rule *, struct pf_addr *, sa_family_t); 280static u_int pf_purge_expired_states(u_int, int); 281static void pf_purge_unlinked_rules(void); 282static int pf_mtag_uminit(void *, int, int); 283static void pf_mtag_free(struct m_tag *); 284#ifdef INET 285static void pf_route(struct mbuf **, struct pf_rule *, int, 286 struct ifnet *, struct pf_state *, 287 struct pf_pdesc *); 288#endif /* INET */ 289#ifdef INET6 290static void pf_change_a6(struct pf_addr *, u_int16_t *, 291 struct pf_addr *, u_int8_t); 292static void pf_route6(struct mbuf **, struct pf_rule *, int, 293 struct ifnet *, struct pf_state *, 294 struct pf_pdesc *); 295#endif /* INET6 */ 296 297int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 298 299VNET_DECLARE(int, pf_end_threads); 300 301VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 302 303#define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 304 (pd)->pf_mtag->flags & PF_PACKET_LOOPED) 305 306#define STATE_LOOKUP(i, k, d, s, pd) \ 307 do { \ 308 (s) = pf_find_state((i), (k), (d)); \ 309 if ((s) == NULL) \ 310 return (PF_DROP); \ 311 if (PACKET_LOOPED(pd)) \ 312 return (PF_PASS); \ 313 if ((d) == PF_OUT && \ 314 (((s)->rule.ptr->rt == PF_ROUTETO && \ 315 (s)->rule.ptr->direction == PF_OUT) || \ 316 ((s)->rule.ptr->rt == PF_REPLYTO && \ 317 (s)->rule.ptr->direction == PF_IN)) && \ 318 (s)->rt_kif != NULL && \ 319 (s)->rt_kif != (i)) \ 320 return (PF_PASS); \ 321 } while (0) 322 323#define BOUND_IFACE(r, k) \ 324 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 325 326#define STATE_INC_COUNTERS(s) \ 327 do { \ 328 counter_u64_add(s->rule.ptr->states_cur, 1); \ 329 counter_u64_add(s->rule.ptr->states_tot, 1); \ 330 if (s->anchor.ptr != NULL) { \ 331 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 332 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 333 } \ 334 if (s->nat_rule.ptr != NULL) { \ 335 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 336 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 337 } \ 338 } while (0) 339 340#define STATE_DEC_COUNTERS(s) \ 341 do { \ 342 if (s->nat_rule.ptr != NULL) \ 343 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 344 if (s->anchor.ptr != NULL) \ 345 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 346 counter_u64_add(s->rule.ptr->states_cur, -1); \ 347 } while (0) 348 349static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 350VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 351VNET_DEFINE(struct pf_idhash *, pf_idhash); 352VNET_DEFINE(struct pf_srchash *, pf_srchash); 353 354SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)"); 355 356u_long pf_hashmask; 357u_long pf_srchashmask; 358static u_long pf_hashsize; 359static u_long pf_srchashsize; 360 361SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 362 &pf_hashsize, 0, "Size of pf(4) states hashtable"); 363SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 364 &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable"); 365 366VNET_DEFINE(void *, pf_swi_cookie); 367 368VNET_DEFINE(uint32_t, pf_hashseed); 369#define V_pf_hashseed VNET(pf_hashseed) 370 371int 372pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af) 373{ 374 375 switch (af) { 376#ifdef INET 377 case AF_INET: 378 if (a->addr32[0] > b->addr32[0]) 379 return (1); 380 if (a->addr32[0] < b->addr32[0]) 381 return (-1); 382 break; 383#endif /* INET */ 384#ifdef INET6 385 case AF_INET6: 386 if (a->addr32[3] > b->addr32[3]) 387 return (1); 388 if (a->addr32[3] < b->addr32[3]) 389 return (-1); 390 if (a->addr32[2] > b->addr32[2]) 391 return (1); 392 if (a->addr32[2] < b->addr32[2]) 393 return (-1); 394 if (a->addr32[1] > b->addr32[1]) 395 return (1); 396 if (a->addr32[1] < b->addr32[1]) 397 return (-1); 398 if (a->addr32[0] > b->addr32[0]) 399 return (1); 400 if (a->addr32[0] < b->addr32[0]) 401 return (-1); 402 break; 403#endif /* INET6 */ 404 default: 405 panic("%s: unknown address family %u", __func__, af); 406 } 407 return (0); 408} 409 410static __inline uint32_t 411pf_hashkey(struct pf_state_key *sk) 412{ 413 uint32_t h; 414 415 h = murmur3_aligned_32((uint32_t *)sk, 416 sizeof(struct pf_state_key_cmp), 417 V_pf_hashseed); 418 419 return (h & pf_hashmask); 420} 421 422static __inline uint32_t 423pf_hashsrc(struct pf_addr *addr, sa_family_t af) 424{ 425 uint32_t h; 426 427 switch (af) { 428 case AF_INET: 429 h = murmur3_aligned_32((uint32_t *)&addr->v4, 430 sizeof(addr->v4), V_pf_hashseed); 431 break; 432 case AF_INET6: 433 h = murmur3_aligned_32((uint32_t *)&addr->v6, 434 sizeof(addr->v6), V_pf_hashseed); 435 break; 436 default: 437 panic("%s: unknown address family %u", __func__, af); 438 } 439 440 return (h & pf_srchashmask); 441} 442 443#ifdef INET6 444void 445pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 446{ 447 switch (af) { 448#ifdef INET 449 case AF_INET: 450 dst->addr32[0] = src->addr32[0]; 451 break; 452#endif /* INET */ 453 case AF_INET6: 454 dst->addr32[0] = src->addr32[0]; 455 dst->addr32[1] = src->addr32[1]; 456 dst->addr32[2] = src->addr32[2]; 457 dst->addr32[3] = src->addr32[3]; 458 break; 459 } 460} 461#endif /* INET6 */ 462 463static void 464pf_init_threshold(struct pf_threshold *threshold, 465 u_int32_t limit, u_int32_t seconds) 466{ 467 threshold->limit = limit * PF_THRESHOLD_MULT; 468 threshold->seconds = seconds; 469 threshold->count = 0; 470 threshold->last = time_uptime; 471} 472 473static void 474pf_add_threshold(struct pf_threshold *threshold) 475{ 476 u_int32_t t = time_uptime, diff = t - threshold->last; 477 478 if (diff >= threshold->seconds) 479 threshold->count = 0; 480 else 481 threshold->count -= threshold->count * diff / 482 threshold->seconds; 483 threshold->count += PF_THRESHOLD_MULT; 484 threshold->last = t; 485} 486 487static int 488pf_check_threshold(struct pf_threshold *threshold) 489{ 490 return (threshold->count > threshold->limit); 491} 492 493static int 494pf_src_connlimit(struct pf_state **state) 495{ 496 struct pf_overload_entry *pfoe; 497 int bad = 0; 498 499 PF_STATE_LOCK_ASSERT(*state); 500 501 (*state)->src_node->conn++; 502 (*state)->src.tcp_est = 1; 503 pf_add_threshold(&(*state)->src_node->conn_rate); 504 505 if ((*state)->rule.ptr->max_src_conn && 506 (*state)->rule.ptr->max_src_conn < 507 (*state)->src_node->conn) { 508 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 509 bad++; 510 } 511 512 if ((*state)->rule.ptr->max_src_conn_rate.limit && 513 pf_check_threshold(&(*state)->src_node->conn_rate)) { 514 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 515 bad++; 516 } 517 518 if (!bad) 519 return (0); 520 521 /* Kill this state. */ 522 (*state)->timeout = PFTM_PURGE; 523 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 524 525 if ((*state)->rule.ptr->overload_tbl == NULL) 526 return (1); 527 528 /* Schedule overloading and flushing task. */ 529 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 530 if (pfoe == NULL) 531 return (1); /* too bad :( */ 532 533 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 534 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 535 pfoe->rule = (*state)->rule.ptr; 536 pfoe->dir = (*state)->direction; 537 PF_OVERLOADQ_LOCK(); 538 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 539 PF_OVERLOADQ_UNLOCK(); 540 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 541 542 return (1); 543} 544 545static void 546pf_overload_task(void *v, int pending) 547{ 548 struct pf_overload_head queue; 549 struct pfr_addr p; 550 struct pf_overload_entry *pfoe, *pfoe1; 551 uint32_t killed = 0; 552 553 CURVNET_SET((struct vnet *)v); 554 555 PF_OVERLOADQ_LOCK(); 556 queue = V_pf_overloadqueue; 557 SLIST_INIT(&V_pf_overloadqueue); 558 PF_OVERLOADQ_UNLOCK(); 559 560 bzero(&p, sizeof(p)); 561 SLIST_FOREACH(pfoe, &queue, next) { 562 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 563 if (V_pf_status.debug >= PF_DEBUG_MISC) { 564 printf("%s: blocking address ", __func__); 565 pf_print_host(&pfoe->addr, 0, pfoe->af); 566 printf("\n"); 567 } 568 569 p.pfra_af = pfoe->af; 570 switch (pfoe->af) { 571#ifdef INET 572 case AF_INET: 573 p.pfra_net = 32; 574 p.pfra_ip4addr = pfoe->addr.v4; 575 break; 576#endif 577#ifdef INET6 578 case AF_INET6: 579 p.pfra_net = 128; 580 p.pfra_ip6addr = pfoe->addr.v6; 581 break; 582#endif 583 } 584 585 PF_RULES_WLOCK(); 586 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 587 PF_RULES_WUNLOCK(); 588 } 589 590 /* 591 * Remove those entries, that don't need flushing. 592 */ 593 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 594 if (pfoe->rule->flush == 0) { 595 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 596 free(pfoe, M_PFTEMP); 597 } else 598 counter_u64_add( 599 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 600 601 /* If nothing to flush, return. */ 602 if (SLIST_EMPTY(&queue)) { 603 CURVNET_RESTORE(); 604 return; 605 } 606 607 for (int i = 0; i <= pf_hashmask; i++) { 608 struct pf_idhash *ih = &V_pf_idhash[i]; 609 struct pf_state_key *sk; 610 struct pf_state *s; 611 612 PF_HASHROW_LOCK(ih); 613 LIST_FOREACH(s, &ih->states, entry) { 614 sk = s->key[PF_SK_WIRE]; 615 SLIST_FOREACH(pfoe, &queue, next) 616 if (sk->af == pfoe->af && 617 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 618 pfoe->rule == s->rule.ptr) && 619 ((pfoe->dir == PF_OUT && 620 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 621 (pfoe->dir == PF_IN && 622 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 623 s->timeout = PFTM_PURGE; 624 s->src.state = s->dst.state = TCPS_CLOSED; 625 killed++; 626 } 627 } 628 PF_HASHROW_UNLOCK(ih); 629 } 630 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 631 free(pfoe, M_PFTEMP); 632 if (V_pf_status.debug >= PF_DEBUG_MISC) 633 printf("%s: %u states killed", __func__, killed); 634 635 CURVNET_RESTORE(); 636} 637 638/* 639 * Can return locked on failure, so that we can consistently 640 * allocate and insert a new one. 641 */ 642struct pf_src_node * 643pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af, 644 int returnlocked) 645{ 646 struct pf_srchash *sh; 647 struct pf_src_node *n; 648 649 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 650 651 sh = &V_pf_srchash[pf_hashsrc(src, af)]; 652 PF_HASHROW_LOCK(sh); 653 LIST_FOREACH(n, &sh->nodes, entry) 654 if (n->rule.ptr == rule && n->af == af && 655 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 656 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 657 break; 658 if (n != NULL) { 659 n->states++; 660 PF_HASHROW_UNLOCK(sh); 661 } else if (returnlocked == 0) 662 PF_HASHROW_UNLOCK(sh); 663 664 return (n); 665} 666 667static int 668pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 669 struct pf_addr *src, sa_family_t af) 670{ 671 672 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 673 rule->rpool.opts & PF_POOL_STICKYADDR), 674 ("%s for non-tracking rule %p", __func__, rule)); 675 676 if (*sn == NULL) 677 *sn = pf_find_src_node(src, rule, af, 1); 678 679 if (*sn == NULL) { 680 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 681 682 PF_HASHROW_ASSERT(sh); 683 684 if (!rule->max_src_nodes || 685 counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) 686 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 687 else 688 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 689 1); 690 if ((*sn) == NULL) { 691 PF_HASHROW_UNLOCK(sh); 692 return (-1); 693 } 694 695 pf_init_threshold(&(*sn)->conn_rate, 696 rule->max_src_conn_rate.limit, 697 rule->max_src_conn_rate.seconds); 698 699 (*sn)->af = af; 700 (*sn)->rule.ptr = rule; 701 PF_ACPY(&(*sn)->addr, src, af); 702 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 703 (*sn)->creation = time_uptime; 704 (*sn)->ruletype = rule->action; 705 (*sn)->states = 1; 706 if ((*sn)->rule.ptr != NULL) 707 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 708 PF_HASHROW_UNLOCK(sh); 709 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 710 } else { 711 if (rule->max_src_states && 712 (*sn)->states >= rule->max_src_states) { 713 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 714 1); 715 return (-1); 716 } 717 } 718 return (0); 719} 720 721void 722pf_unlink_src_node(struct pf_src_node *src) 723{ 724 725 PF_HASHROW_ASSERT(&V_pf_srchash[pf_hashsrc(&src->addr, src->af)]); 726 LIST_REMOVE(src, entry); 727 if (src->rule.ptr) 728 counter_u64_add(src->rule.ptr->src_nodes, -1); 729} 730 731u_int 732pf_free_src_nodes(struct pf_src_node_list *head) 733{ 734 struct pf_src_node *sn, *tmp; 735 u_int count = 0; 736 737 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 738 uma_zfree(V_pf_sources_z, sn); 739 count++; 740 } 741 742 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count); 743 744 return (count); 745} 746 747void 748pf_mtag_initialize() 749{ 750 751 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 752 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 753 UMA_ALIGN_PTR, 0); 754} 755 756/* Per-vnet data storage structures initialization. */ 757void 758pf_initialize() 759{ 760 struct pf_keyhash *kh; 761 struct pf_idhash *ih; 762 struct pf_srchash *sh; 763 u_int i; 764 765 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &pf_hashsize); 766 if (pf_hashsize == 0 || !powerof2(pf_hashsize)) 767 pf_hashsize = PF_HASHSIZ; 768 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &pf_srchashsize); 769 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) 770 pf_srchashsize = PF_HASHSIZ / 4; 771 772 V_pf_hashseed = arc4random(); 773 774 /* States and state keys storage. */ 775 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 776 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 777 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 778 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 779 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 780 781 V_pf_state_key_z = uma_zcreate("pf state keys", 782 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 783 UMA_ALIGN_PTR, 0); 784 V_pf_keyhash = malloc(pf_hashsize * sizeof(struct pf_keyhash), 785 M_PFHASH, M_WAITOK | M_ZERO); 786 V_pf_idhash = malloc(pf_hashsize * sizeof(struct pf_idhash), 787 M_PFHASH, M_WAITOK | M_ZERO); 788 pf_hashmask = pf_hashsize - 1; 789 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 790 i++, kh++, ih++) { 791 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 792 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 793 } 794 795 /* Source nodes. */ 796 V_pf_sources_z = uma_zcreate("pf source nodes", 797 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 798 0); 799 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 800 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 801 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 802 V_pf_srchash = malloc(pf_srchashsize * sizeof(struct pf_srchash), 803 M_PFHASH, M_WAITOK|M_ZERO); 804 pf_srchashmask = pf_srchashsize - 1; 805 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) 806 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 807 808 /* ALTQ */ 809 TAILQ_INIT(&V_pf_altqs[0]); 810 TAILQ_INIT(&V_pf_altqs[1]); 811 TAILQ_INIT(&V_pf_pabuf); 812 V_pf_altqs_active = &V_pf_altqs[0]; 813 V_pf_altqs_inactive = &V_pf_altqs[1]; 814 815 816 /* Send & overload+flush queues. */ 817 STAILQ_INIT(&V_pf_sendqueue); 818 SLIST_INIT(&V_pf_overloadqueue); 819 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 820 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 821 mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL, 822 MTX_DEF); 823 824 /* Unlinked, but may be referenced rules. */ 825 TAILQ_INIT(&V_pf_unlinked_rules); 826 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 827} 828 829void 830pf_mtag_cleanup() 831{ 832 833 uma_zdestroy(pf_mtag_z); 834} 835 836void 837pf_cleanup() 838{ 839 struct pf_keyhash *kh; 840 struct pf_idhash *ih; 841 struct pf_srchash *sh; 842 struct pf_send_entry *pfse, *next; 843 u_int i; 844 845 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 846 i++, kh++, ih++) { 847 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 848 __func__)); 849 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 850 __func__)); 851 mtx_destroy(&kh->lock); 852 mtx_destroy(&ih->lock); 853 } 854 free(V_pf_keyhash, M_PFHASH); 855 free(V_pf_idhash, M_PFHASH); 856 857 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 858 KASSERT(LIST_EMPTY(&sh->nodes), 859 ("%s: source node hash not empty", __func__)); 860 mtx_destroy(&sh->lock); 861 } 862 free(V_pf_srchash, M_PFHASH); 863 864 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 865 m_freem(pfse->pfse_m); 866 free(pfse, M_PFTEMP); 867 } 868 869 mtx_destroy(&pf_sendqueue_mtx); 870 mtx_destroy(&pf_overloadqueue_mtx); 871 mtx_destroy(&pf_unlnkdrules_mtx); 872 873 uma_zdestroy(V_pf_sources_z); 874 uma_zdestroy(V_pf_state_z); 875 uma_zdestroy(V_pf_state_key_z); 876} 877 878static int 879pf_mtag_uminit(void *mem, int size, int how) 880{ 881 struct m_tag *t; 882 883 t = (struct m_tag *)mem; 884 t->m_tag_cookie = MTAG_ABI_COMPAT; 885 t->m_tag_id = PACKET_TAG_PF; 886 t->m_tag_len = sizeof(struct pf_mtag); 887 t->m_tag_free = pf_mtag_free; 888 889 return (0); 890} 891 892static void 893pf_mtag_free(struct m_tag *t) 894{ 895 896 uma_zfree(pf_mtag_z, t); 897} 898 899struct pf_mtag * 900pf_get_mtag(struct mbuf *m) 901{ 902 struct m_tag *mtag; 903 904 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 905 return ((struct pf_mtag *)(mtag + 1)); 906 907 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 908 if (mtag == NULL) 909 return (NULL); 910 bzero(mtag + 1, sizeof(struct pf_mtag)); 911 m_tag_prepend(m, mtag); 912 913 return ((struct pf_mtag *)(mtag + 1)); 914} 915 916static int 917pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 918 struct pf_state *s) 919{ 920 struct pf_keyhash *khs, *khw, *kh; 921 struct pf_state_key *sk, *cur; 922 struct pf_state *si, *olds = NULL; 923 int idx; 924 925 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 926 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 927 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 928 929 /* 930 * We need to lock hash slots of both keys. To avoid deadlock 931 * we always lock the slot with lower address first. Unlock order 932 * isn't important. 933 * 934 * We also need to lock ID hash slot before dropping key 935 * locks. On success we return with ID hash slot locked. 936 */ 937 938 if (skw == sks) { 939 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 940 PF_HASHROW_LOCK(khs); 941 } else { 942 khs = &V_pf_keyhash[pf_hashkey(sks)]; 943 khw = &V_pf_keyhash[pf_hashkey(skw)]; 944 if (khs == khw) { 945 PF_HASHROW_LOCK(khs); 946 } else if (khs < khw) { 947 PF_HASHROW_LOCK(khs); 948 PF_HASHROW_LOCK(khw); 949 } else { 950 PF_HASHROW_LOCK(khw); 951 PF_HASHROW_LOCK(khs); 952 } 953 } 954 955#define KEYS_UNLOCK() do { \ 956 if (khs != khw) { \ 957 PF_HASHROW_UNLOCK(khs); \ 958 PF_HASHROW_UNLOCK(khw); \ 959 } else \ 960 PF_HASHROW_UNLOCK(khs); \ 961} while (0) 962 963 /* 964 * First run: start with wire key. 965 */ 966 sk = skw; 967 kh = khw; 968 idx = PF_SK_WIRE; 969 970keyattach: 971 LIST_FOREACH(cur, &kh->keys, entry) 972 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 973 break; 974 975 if (cur != NULL) { 976 /* Key exists. Check for same kif, if none, add to key. */ 977 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 978 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 979 980 PF_HASHROW_LOCK(ih); 981 if (si->kif == s->kif && 982 si->direction == s->direction) { 983 if (sk->proto == IPPROTO_TCP && 984 si->src.state >= TCPS_FIN_WAIT_2 && 985 si->dst.state >= TCPS_FIN_WAIT_2) { 986 /* 987 * New state matches an old >FIN_WAIT_2 988 * state. We can't drop key hash locks, 989 * thus we can't unlink it properly. 990 * 991 * As a workaround we drop it into 992 * TCPS_CLOSED state, schedule purge 993 * ASAP and push it into the very end 994 * of the slot TAILQ, so that it won't 995 * conflict with our new state. 996 */ 997 si->src.state = si->dst.state = 998 TCPS_CLOSED; 999 si->timeout = PFTM_PURGE; 1000 olds = si; 1001 } else { 1002 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1003 printf("pf: %s key attach " 1004 "failed on %s: ", 1005 (idx == PF_SK_WIRE) ? 1006 "wire" : "stack", 1007 s->kif->pfik_name); 1008 pf_print_state_parts(s, 1009 (idx == PF_SK_WIRE) ? 1010 sk : NULL, 1011 (idx == PF_SK_STACK) ? 1012 sk : NULL); 1013 printf(", existing: "); 1014 pf_print_state_parts(si, 1015 (idx == PF_SK_WIRE) ? 1016 sk : NULL, 1017 (idx == PF_SK_STACK) ? 1018 sk : NULL); 1019 printf("\n"); 1020 } 1021 PF_HASHROW_UNLOCK(ih); 1022 KEYS_UNLOCK(); 1023 uma_zfree(V_pf_state_key_z, sk); 1024 if (idx == PF_SK_STACK) 1025 pf_detach_state(s); 1026 return (EEXIST); /* collision! */ 1027 } 1028 } 1029 PF_HASHROW_UNLOCK(ih); 1030 } 1031 uma_zfree(V_pf_state_key_z, sk); 1032 s->key[idx] = cur; 1033 } else { 1034 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1035 s->key[idx] = sk; 1036 } 1037 1038stateattach: 1039 /* List is sorted, if-bound states before floating. */ 1040 if (s->kif == V_pfi_all) 1041 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1042 else 1043 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1044 1045 if (olds) { 1046 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1047 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1048 key_list[idx]); 1049 olds = NULL; 1050 } 1051 1052 /* 1053 * Attach done. See how should we (or should not?) 1054 * attach a second key. 1055 */ 1056 if (sks == skw) { 1057 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1058 idx = PF_SK_STACK; 1059 sks = NULL; 1060 goto stateattach; 1061 } else if (sks != NULL) { 1062 /* 1063 * Continue attaching with stack key. 1064 */ 1065 sk = sks; 1066 kh = khs; 1067 idx = PF_SK_STACK; 1068 sks = NULL; 1069 goto keyattach; 1070 } 1071 1072 PF_STATE_LOCK(s); 1073 KEYS_UNLOCK(); 1074 1075 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1076 ("%s failure", __func__)); 1077 1078 return (0); 1079#undef KEYS_UNLOCK 1080} 1081 1082static void 1083pf_detach_state(struct pf_state *s) 1084{ 1085 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1086 struct pf_keyhash *kh; 1087 1088 if (sks != NULL) { 1089 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1090 PF_HASHROW_LOCK(kh); 1091 if (s->key[PF_SK_STACK] != NULL) 1092 pf_state_key_detach(s, PF_SK_STACK); 1093 /* 1094 * If both point to same key, then we are done. 1095 */ 1096 if (sks == s->key[PF_SK_WIRE]) { 1097 pf_state_key_detach(s, PF_SK_WIRE); 1098 PF_HASHROW_UNLOCK(kh); 1099 return; 1100 } 1101 PF_HASHROW_UNLOCK(kh); 1102 } 1103 1104 if (s->key[PF_SK_WIRE] != NULL) { 1105 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1106 PF_HASHROW_LOCK(kh); 1107 if (s->key[PF_SK_WIRE] != NULL) 1108 pf_state_key_detach(s, PF_SK_WIRE); 1109 PF_HASHROW_UNLOCK(kh); 1110 } 1111} 1112 1113static void 1114pf_state_key_detach(struct pf_state *s, int idx) 1115{ 1116 struct pf_state_key *sk = s->key[idx]; 1117#ifdef INVARIANTS 1118 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1119 1120 PF_HASHROW_ASSERT(kh); 1121#endif 1122 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1123 s->key[idx] = NULL; 1124 1125 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1126 LIST_REMOVE(sk, entry); 1127 uma_zfree(V_pf_state_key_z, sk); 1128 } 1129} 1130 1131static int 1132pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1133{ 1134 struct pf_state_key *sk = mem; 1135 1136 bzero(sk, sizeof(struct pf_state_key_cmp)); 1137 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1138 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1139 1140 return (0); 1141} 1142 1143struct pf_state_key * 1144pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1145 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1146{ 1147 struct pf_state_key *sk; 1148 1149 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1150 if (sk == NULL) 1151 return (NULL); 1152 1153 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1154 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1155 sk->port[pd->sidx] = sport; 1156 sk->port[pd->didx] = dport; 1157 sk->proto = pd->proto; 1158 sk->af = pd->af; 1159 1160 return (sk); 1161} 1162 1163struct pf_state_key * 1164pf_state_key_clone(struct pf_state_key *orig) 1165{ 1166 struct pf_state_key *sk; 1167 1168 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1169 if (sk == NULL) 1170 return (NULL); 1171 1172 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1173 1174 return (sk); 1175} 1176 1177int 1178pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1179 struct pf_state_key *sks, struct pf_state *s) 1180{ 1181 struct pf_idhash *ih; 1182 struct pf_state *cur; 1183 int error; 1184 1185 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1186 ("%s: sks not pristine", __func__)); 1187 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1188 ("%s: skw not pristine", __func__)); 1189 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1190 1191 s->kif = kif; 1192 1193 if (s->id == 0 && s->creatorid == 0) { 1194 /* XXX: should be atomic, but probability of collision low */ 1195 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1196 V_pf_stateid[curcpu] = 1; 1197 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1198 s->id = htobe64(s->id); 1199 s->creatorid = V_pf_status.hostid; 1200 } 1201 1202 /* Returns with ID locked on success. */ 1203 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1204 return (error); 1205 1206 ih = &V_pf_idhash[PF_IDHASH(s)]; 1207 PF_HASHROW_ASSERT(ih); 1208 LIST_FOREACH(cur, &ih->states, entry) 1209 if (cur->id == s->id && cur->creatorid == s->creatorid) 1210 break; 1211 1212 if (cur != NULL) { 1213 PF_HASHROW_UNLOCK(ih); 1214 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1215 printf("pf: state ID collision: " 1216 "id: %016llx creatorid: %08x\n", 1217 (unsigned long long)be64toh(s->id), 1218 ntohl(s->creatorid)); 1219 } 1220 pf_detach_state(s); 1221 return (EEXIST); 1222 } 1223 LIST_INSERT_HEAD(&ih->states, s, entry); 1224 /* One for keys, one for ID hash. */ 1225 refcount_init(&s->refs, 2); 1226 1227 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1228 if (pfsync_insert_state_ptr != NULL) 1229 pfsync_insert_state_ptr(s); 1230 1231 /* Returns locked. */ 1232 return (0); 1233} 1234 1235/* 1236 * Find state by ID: returns with locked row on success. 1237 */ 1238struct pf_state * 1239pf_find_state_byid(uint64_t id, uint32_t creatorid) 1240{ 1241 struct pf_idhash *ih; 1242 struct pf_state *s; 1243 1244 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1245 1246 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; 1247 1248 PF_HASHROW_LOCK(ih); 1249 LIST_FOREACH(s, &ih->states, entry) 1250 if (s->id == id && s->creatorid == creatorid) 1251 break; 1252 1253 if (s == NULL) 1254 PF_HASHROW_UNLOCK(ih); 1255 1256 return (s); 1257} 1258 1259/* 1260 * Find state by key. 1261 * Returns with ID hash slot locked on success. 1262 */ 1263static struct pf_state * 1264pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1265{ 1266 struct pf_keyhash *kh; 1267 struct pf_state_key *sk; 1268 struct pf_state *s; 1269 int idx; 1270 1271 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1272 1273 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1274 1275 PF_HASHROW_LOCK(kh); 1276 LIST_FOREACH(sk, &kh->keys, entry) 1277 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1278 break; 1279 if (sk == NULL) { 1280 PF_HASHROW_UNLOCK(kh); 1281 return (NULL); 1282 } 1283 1284 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1285 1286 /* List is sorted, if-bound states before floating ones. */ 1287 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1288 if (s->kif == V_pfi_all || s->kif == kif) { 1289 PF_STATE_LOCK(s); 1290 PF_HASHROW_UNLOCK(kh); 1291 if (s->timeout >= PFTM_MAX) { 1292 /* 1293 * State is either being processed by 1294 * pf_unlink_state() in an other thread, or 1295 * is scheduled for immediate expiry. 1296 */ 1297 PF_STATE_UNLOCK(s); 1298 return (NULL); 1299 } 1300 return (s); 1301 } 1302 PF_HASHROW_UNLOCK(kh); 1303 1304 return (NULL); 1305} 1306 1307struct pf_state * 1308pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1309{ 1310 struct pf_keyhash *kh; 1311 struct pf_state_key *sk; 1312 struct pf_state *s, *ret = NULL; 1313 int idx, inout = 0; 1314 1315 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1316 1317 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1318 1319 PF_HASHROW_LOCK(kh); 1320 LIST_FOREACH(sk, &kh->keys, entry) 1321 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1322 break; 1323 if (sk == NULL) { 1324 PF_HASHROW_UNLOCK(kh); 1325 return (NULL); 1326 } 1327 switch (dir) { 1328 case PF_IN: 1329 idx = PF_SK_WIRE; 1330 break; 1331 case PF_OUT: 1332 idx = PF_SK_STACK; 1333 break; 1334 case PF_INOUT: 1335 idx = PF_SK_WIRE; 1336 inout = 1; 1337 break; 1338 default: 1339 panic("%s: dir %u", __func__, dir); 1340 } 1341second_run: 1342 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1343 if (more == NULL) { 1344 PF_HASHROW_UNLOCK(kh); 1345 return (s); 1346 } 1347 1348 if (ret) 1349 (*more)++; 1350 else 1351 ret = s; 1352 } 1353 if (inout == 1) { 1354 inout = 0; 1355 idx = PF_SK_STACK; 1356 goto second_run; 1357 } 1358 PF_HASHROW_UNLOCK(kh); 1359 1360 return (ret); 1361} 1362 1363/* END state table stuff */ 1364 1365static void 1366pf_send(struct pf_send_entry *pfse) 1367{ 1368 1369 PF_SENDQ_LOCK(); 1370 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1371 PF_SENDQ_UNLOCK(); 1372 swi_sched(V_pf_swi_cookie, 0); 1373} 1374 1375void 1376pf_intr(void *v) 1377{ 1378 struct pf_send_head queue; 1379 struct pf_send_entry *pfse, *next; 1380 1381 CURVNET_SET((struct vnet *)v); 1382 1383 PF_SENDQ_LOCK(); 1384 queue = V_pf_sendqueue; 1385 STAILQ_INIT(&V_pf_sendqueue); 1386 PF_SENDQ_UNLOCK(); 1387 1388 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1389 switch (pfse->pfse_type) { 1390#ifdef INET 1391 case PFSE_IP: 1392 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1393 break; 1394 case PFSE_ICMP: 1395 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1396 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1397 break; 1398#endif /* INET */ 1399#ifdef INET6 1400 case PFSE_IP6: 1401 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1402 NULL); 1403 break; 1404 case PFSE_ICMP6: 1405 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1406 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1407 break; 1408#endif /* INET6 */ 1409 default: 1410 panic("%s: unknown type", __func__); 1411 } 1412 free(pfse, M_PFTEMP); 1413 } 1414 CURVNET_RESTORE(); 1415} 1416 1417void 1418pf_purge_thread(void *v) 1419{ 1420 u_int idx = 0; 1421 1422 CURVNET_SET((struct vnet *)v); 1423 1424 for (;;) { 1425 PF_RULES_RLOCK(); 1426 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1427 1428 if (V_pf_end_threads) { 1429 /* 1430 * To cleanse up all kifs and rules we need 1431 * two runs: first one clears reference flags, 1432 * then pf_purge_expired_states() doesn't 1433 * raise them, and then second run frees. 1434 */ 1435 PF_RULES_RUNLOCK(); 1436 pf_purge_unlinked_rules(); 1437 pfi_kif_purge(); 1438 1439 /* 1440 * Now purge everything. 1441 */ 1442 pf_purge_expired_states(0, pf_hashmask); 1443 pf_purge_expired_fragments(); 1444 pf_purge_expired_src_nodes(); 1445 1446 /* 1447 * Now all kifs & rules should be unreferenced, 1448 * thus should be successfully freed. 1449 */ 1450 pf_purge_unlinked_rules(); 1451 pfi_kif_purge(); 1452 1453 /* 1454 * Announce success and exit. 1455 */ 1456 PF_RULES_RLOCK(); 1457 V_pf_end_threads++; 1458 PF_RULES_RUNLOCK(); 1459 wakeup(pf_purge_thread); 1460 kproc_exit(0); 1461 } 1462 PF_RULES_RUNLOCK(); 1463 1464 /* Process 1/interval fraction of the state table every run. */ 1465 idx = pf_purge_expired_states(idx, pf_hashmask / 1466 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1467 1468 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1469 if (idx == 0) { 1470 /* 1471 * Order is important: 1472 * - states and src nodes reference rules 1473 * - states and rules reference kifs 1474 */ 1475 pf_purge_expired_fragments(); 1476 pf_purge_expired_src_nodes(); 1477 pf_purge_unlinked_rules(); 1478 pfi_kif_purge(); 1479 } 1480 } 1481 /* not reached */ 1482 CURVNET_RESTORE(); 1483} 1484 1485u_int32_t 1486pf_state_expires(const struct pf_state *state) 1487{ 1488 u_int32_t timeout; 1489 u_int32_t start; 1490 u_int32_t end; 1491 u_int32_t states; 1492 1493 /* handle all PFTM_* > PFTM_MAX here */ 1494 if (state->timeout == PFTM_PURGE) 1495 return (time_uptime); 1496 KASSERT(state->timeout != PFTM_UNLINKED, 1497 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1498 KASSERT((state->timeout < PFTM_MAX), 1499 ("pf_state_expires: timeout > PFTM_MAX")); 1500 timeout = state->rule.ptr->timeout[state->timeout]; 1501 if (!timeout) 1502 timeout = V_pf_default_rule.timeout[state->timeout]; 1503 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1504 if (start) { 1505 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1506 states = counter_u64_fetch(state->rule.ptr->states_cur); 1507 } else { 1508 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1509 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1510 states = V_pf_status.states; 1511 } 1512 if (end && states > start && start < end) { 1513 if (states < end) 1514 return (state->expire + timeout * (end - states) / 1515 (end - start)); 1516 else 1517 return (time_uptime); 1518 } 1519 return (state->expire + timeout); 1520} 1521 1522void 1523pf_purge_expired_src_nodes() 1524{ 1525 struct pf_src_node_list freelist; 1526 struct pf_srchash *sh; 1527 struct pf_src_node *cur, *next; 1528 int i; 1529 1530 LIST_INIT(&freelist); 1531 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1532 PF_HASHROW_LOCK(sh); 1533 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1534 if (cur->states == 0 && cur->expire <= time_uptime) { 1535 pf_unlink_src_node(cur); 1536 LIST_INSERT_HEAD(&freelist, cur, entry); 1537 } else if (cur->rule.ptr != NULL) 1538 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1539 PF_HASHROW_UNLOCK(sh); 1540 } 1541 1542 pf_free_src_nodes(&freelist); 1543 1544 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 1545} 1546 1547static void 1548pf_src_tree_remove_state(struct pf_state *s) 1549{ 1550 struct pf_src_node *sn; 1551 struct pf_srchash *sh; 1552 uint32_t timeout; 1553 1554 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ? 1555 s->rule.ptr->timeout[PFTM_SRC_NODE] : 1556 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1557 1558 if (s->src_node != NULL) { 1559 sn = s->src_node; 1560 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1561 PF_HASHROW_LOCK(sh); 1562 if (s->src.tcp_est) 1563 --sn->conn; 1564 if (--sn->states == 0) 1565 sn->expire = time_uptime + timeout; 1566 PF_HASHROW_UNLOCK(sh); 1567 } 1568 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1569 sn = s->nat_src_node; 1570 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1571 PF_HASHROW_LOCK(sh); 1572 if (--sn->states == 0) 1573 sn->expire = time_uptime + timeout; 1574 PF_HASHROW_UNLOCK(sh); 1575 } 1576 s->src_node = s->nat_src_node = NULL; 1577} 1578 1579/* 1580 * Unlink and potentilly free a state. Function may be 1581 * called with ID hash row locked, but always returns 1582 * unlocked, since it needs to go through key hash locking. 1583 */ 1584int 1585pf_unlink_state(struct pf_state *s, u_int flags) 1586{ 1587 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1588 1589 if ((flags & PF_ENTER_LOCKED) == 0) 1590 PF_HASHROW_LOCK(ih); 1591 else 1592 PF_HASHROW_ASSERT(ih); 1593 1594 if (s->timeout == PFTM_UNLINKED) { 1595 /* 1596 * State is being processed 1597 * by pf_unlink_state() in 1598 * an other thread. 1599 */ 1600 PF_HASHROW_UNLOCK(ih); 1601 return (0); /* XXXGL: undefined actually */ 1602 } 1603 1604 if (s->src.state == PF_TCPS_PROXY_DST) { 1605 /* XXX wire key the right one? */ 1606 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1607 &s->key[PF_SK_WIRE]->addr[1], 1608 &s->key[PF_SK_WIRE]->addr[0], 1609 s->key[PF_SK_WIRE]->port[1], 1610 s->key[PF_SK_WIRE]->port[0], 1611 s->src.seqhi, s->src.seqlo + 1, 1612 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1613 } 1614 1615 LIST_REMOVE(s, entry); 1616 pf_src_tree_remove_state(s); 1617 1618 if (pfsync_delete_state_ptr != NULL) 1619 pfsync_delete_state_ptr(s); 1620 1621 STATE_DEC_COUNTERS(s); 1622 1623 s->timeout = PFTM_UNLINKED; 1624 1625 PF_HASHROW_UNLOCK(ih); 1626 1627 pf_detach_state(s); 1628 refcount_release(&s->refs); 1629 1630 return (pf_release_state(s)); 1631} 1632 1633void 1634pf_free_state(struct pf_state *cur) 1635{ 1636 1637 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1638 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1639 cur->timeout)); 1640 1641 pf_normalize_tcp_cleanup(cur); 1642 uma_zfree(V_pf_state_z, cur); 1643 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 1644} 1645 1646/* 1647 * Called only from pf_purge_thread(), thus serialized. 1648 */ 1649static u_int 1650pf_purge_expired_states(u_int i, int maxcheck) 1651{ 1652 struct pf_idhash *ih; 1653 struct pf_state *s; 1654 1655 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1656 1657 /* 1658 * Go through hash and unlink states that expire now. 1659 */ 1660 while (maxcheck > 0) { 1661 1662 ih = &V_pf_idhash[i]; 1663relock: 1664 PF_HASHROW_LOCK(ih); 1665 LIST_FOREACH(s, &ih->states, entry) { 1666 if (pf_state_expires(s) <= time_uptime) { 1667 V_pf_status.states -= 1668 pf_unlink_state(s, PF_ENTER_LOCKED); 1669 goto relock; 1670 } 1671 s->rule.ptr->rule_flag |= PFRULE_REFS; 1672 if (s->nat_rule.ptr != NULL) 1673 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1674 if (s->anchor.ptr != NULL) 1675 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1676 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1677 if (s->rt_kif) 1678 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1679 } 1680 PF_HASHROW_UNLOCK(ih); 1681 1682 /* Return when we hit end of hash. */ 1683 if (++i > pf_hashmask) { 1684 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1685 return (0); 1686 } 1687 1688 maxcheck--; 1689 } 1690 1691 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1692 1693 return (i); 1694} 1695 1696static void 1697pf_purge_unlinked_rules() 1698{ 1699 struct pf_rulequeue tmpq; 1700 struct pf_rule *r, *r1; 1701 1702 /* 1703 * If we have overloading task pending, then we'd 1704 * better skip purging this time. There is a tiny 1705 * probability that overloading task references 1706 * an already unlinked rule. 1707 */ 1708 PF_OVERLOADQ_LOCK(); 1709 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 1710 PF_OVERLOADQ_UNLOCK(); 1711 return; 1712 } 1713 PF_OVERLOADQ_UNLOCK(); 1714 1715 /* 1716 * Do naive mark-and-sweep garbage collecting of old rules. 1717 * Reference flag is raised by pf_purge_expired_states() 1718 * and pf_purge_expired_src_nodes(). 1719 * 1720 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1721 * use a temporary queue. 1722 */ 1723 TAILQ_INIT(&tmpq); 1724 PF_UNLNKDRULES_LOCK(); 1725 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1726 if (!(r->rule_flag & PFRULE_REFS)) { 1727 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1728 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1729 } else 1730 r->rule_flag &= ~PFRULE_REFS; 1731 } 1732 PF_UNLNKDRULES_UNLOCK(); 1733 1734 if (!TAILQ_EMPTY(&tmpq)) { 1735 PF_RULES_WLOCK(); 1736 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1737 TAILQ_REMOVE(&tmpq, r, entries); 1738 pf_free_rule(r); 1739 } 1740 PF_RULES_WUNLOCK(); 1741 } 1742} 1743 1744void 1745pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1746{ 1747 switch (af) { 1748#ifdef INET 1749 case AF_INET: { 1750 u_int32_t a = ntohl(addr->addr32[0]); 1751 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1752 (a>>8)&255, a&255); 1753 if (p) { 1754 p = ntohs(p); 1755 printf(":%u", p); 1756 } 1757 break; 1758 } 1759#endif /* INET */ 1760#ifdef INET6 1761 case AF_INET6: { 1762 u_int16_t b; 1763 u_int8_t i, curstart, curend, maxstart, maxend; 1764 curstart = curend = maxstart = maxend = 255; 1765 for (i = 0; i < 8; i++) { 1766 if (!addr->addr16[i]) { 1767 if (curstart == 255) 1768 curstart = i; 1769 curend = i; 1770 } else { 1771 if ((curend - curstart) > 1772 (maxend - maxstart)) { 1773 maxstart = curstart; 1774 maxend = curend; 1775 } 1776 curstart = curend = 255; 1777 } 1778 } 1779 if ((curend - curstart) > 1780 (maxend - maxstart)) { 1781 maxstart = curstart; 1782 maxend = curend; 1783 } 1784 for (i = 0; i < 8; i++) { 1785 if (i >= maxstart && i <= maxend) { 1786 if (i == 0) 1787 printf(":"); 1788 if (i == maxend) 1789 printf(":"); 1790 } else { 1791 b = ntohs(addr->addr16[i]); 1792 printf("%x", b); 1793 if (i < 7) 1794 printf(":"); 1795 } 1796 } 1797 if (p) { 1798 p = ntohs(p); 1799 printf("[%u]", p); 1800 } 1801 break; 1802 } 1803#endif /* INET6 */ 1804 } 1805} 1806 1807void 1808pf_print_state(struct pf_state *s) 1809{ 1810 pf_print_state_parts(s, NULL, NULL); 1811} 1812 1813static void 1814pf_print_state_parts(struct pf_state *s, 1815 struct pf_state_key *skwp, struct pf_state_key *sksp) 1816{ 1817 struct pf_state_key *skw, *sks; 1818 u_int8_t proto, dir; 1819 1820 /* Do our best to fill these, but they're skipped if NULL */ 1821 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1822 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1823 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1824 dir = s ? s->direction : 0; 1825 1826 switch (proto) { 1827 case IPPROTO_IPV4: 1828 printf("IPv4"); 1829 break; 1830 case IPPROTO_IPV6: 1831 printf("IPv6"); 1832 break; 1833 case IPPROTO_TCP: 1834 printf("TCP"); 1835 break; 1836 case IPPROTO_UDP: 1837 printf("UDP"); 1838 break; 1839 case IPPROTO_ICMP: 1840 printf("ICMP"); 1841 break; 1842 case IPPROTO_ICMPV6: 1843 printf("ICMPv6"); 1844 break; 1845 default: 1846 printf("%u", skw->proto); 1847 break; 1848 } 1849 switch (dir) { 1850 case PF_IN: 1851 printf(" in"); 1852 break; 1853 case PF_OUT: 1854 printf(" out"); 1855 break; 1856 } 1857 if (skw) { 1858 printf(" wire: "); 1859 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1860 printf(" "); 1861 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1862 } 1863 if (sks) { 1864 printf(" stack: "); 1865 if (sks != skw) { 1866 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1867 printf(" "); 1868 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1869 } else 1870 printf("-"); 1871 } 1872 if (s) { 1873 if (proto == IPPROTO_TCP) { 1874 printf(" [lo=%u high=%u win=%u modulator=%u", 1875 s->src.seqlo, s->src.seqhi, 1876 s->src.max_win, s->src.seqdiff); 1877 if (s->src.wscale && s->dst.wscale) 1878 printf(" wscale=%u", 1879 s->src.wscale & PF_WSCALE_MASK); 1880 printf("]"); 1881 printf(" [lo=%u high=%u win=%u modulator=%u", 1882 s->dst.seqlo, s->dst.seqhi, 1883 s->dst.max_win, s->dst.seqdiff); 1884 if (s->src.wscale && s->dst.wscale) 1885 printf(" wscale=%u", 1886 s->dst.wscale & PF_WSCALE_MASK); 1887 printf("]"); 1888 } 1889 printf(" %u:%u", s->src.state, s->dst.state); 1890 } 1891} 1892 1893void 1894pf_print_flags(u_int8_t f) 1895{ 1896 if (f) 1897 printf(" "); 1898 if (f & TH_FIN) 1899 printf("F"); 1900 if (f & TH_SYN) 1901 printf("S"); 1902 if (f & TH_RST) 1903 printf("R"); 1904 if (f & TH_PUSH) 1905 printf("P"); 1906 if (f & TH_ACK) 1907 printf("A"); 1908 if (f & TH_URG) 1909 printf("U"); 1910 if (f & TH_ECE) 1911 printf("E"); 1912 if (f & TH_CWR) 1913 printf("W"); 1914} 1915 1916#define PF_SET_SKIP_STEPS(i) \ 1917 do { \ 1918 while (head[i] != cur) { \ 1919 head[i]->skip[i].ptr = cur; \ 1920 head[i] = TAILQ_NEXT(head[i], entries); \ 1921 } \ 1922 } while (0) 1923 1924void 1925pf_calc_skip_steps(struct pf_rulequeue *rules) 1926{ 1927 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1928 int i; 1929 1930 cur = TAILQ_FIRST(rules); 1931 prev = cur; 1932 for (i = 0; i < PF_SKIP_COUNT; ++i) 1933 head[i] = cur; 1934 while (cur != NULL) { 1935 1936 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1937 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1938 if (cur->direction != prev->direction) 1939 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1940 if (cur->af != prev->af) 1941 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1942 if (cur->proto != prev->proto) 1943 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1944 if (cur->src.neg != prev->src.neg || 1945 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1946 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1947 if (cur->src.port[0] != prev->src.port[0] || 1948 cur->src.port[1] != prev->src.port[1] || 1949 cur->src.port_op != prev->src.port_op) 1950 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1951 if (cur->dst.neg != prev->dst.neg || 1952 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1953 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1954 if (cur->dst.port[0] != prev->dst.port[0] || 1955 cur->dst.port[1] != prev->dst.port[1] || 1956 cur->dst.port_op != prev->dst.port_op) 1957 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1958 1959 prev = cur; 1960 cur = TAILQ_NEXT(cur, entries); 1961 } 1962 for (i = 0; i < PF_SKIP_COUNT; ++i) 1963 PF_SET_SKIP_STEPS(i); 1964} 1965 1966static int 1967pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1968{ 1969 if (aw1->type != aw2->type) 1970 return (1); 1971 switch (aw1->type) { 1972 case PF_ADDR_ADDRMASK: 1973 case PF_ADDR_RANGE: 1974 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1975 return (1); 1976 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1977 return (1); 1978 return (0); 1979 case PF_ADDR_DYNIFTL: 1980 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1981 case PF_ADDR_NOROUTE: 1982 case PF_ADDR_URPFFAILED: 1983 return (0); 1984 case PF_ADDR_TABLE: 1985 return (aw1->p.tbl != aw2->p.tbl); 1986 default: 1987 printf("invalid address type: %d\n", aw1->type); 1988 return (1); 1989 } 1990} 1991 1992u_int16_t 1993pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1994{ 1995 u_int32_t l; 1996 1997 if (udp && !cksum) 1998 return (0x0000); 1999 l = cksum + old - new; 2000 l = (l >> 16) + (l & 65535); 2001 l = l & 65535; 2002 if (udp && !l) 2003 return (0xFFFF); 2004 return (l); 2005} 2006 2007static void 2008pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 2009 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 2010{ 2011 struct pf_addr ao; 2012 u_int16_t po = *p; 2013 2014 PF_ACPY(&ao, a, af); 2015 PF_ACPY(a, an, af); 2016 2017 *p = pn; 2018 2019 switch (af) { 2020#ifdef INET 2021 case AF_INET: 2022 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2023 ao.addr16[0], an->addr16[0], 0), 2024 ao.addr16[1], an->addr16[1], 0); 2025 *p = pn; 2026 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2027 ao.addr16[0], an->addr16[0], u), 2028 ao.addr16[1], an->addr16[1], u), 2029 po, pn, u); 2030 break; 2031#endif /* INET */ 2032#ifdef INET6 2033 case AF_INET6: 2034 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2035 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2036 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2037 ao.addr16[0], an->addr16[0], u), 2038 ao.addr16[1], an->addr16[1], u), 2039 ao.addr16[2], an->addr16[2], u), 2040 ao.addr16[3], an->addr16[3], u), 2041 ao.addr16[4], an->addr16[4], u), 2042 ao.addr16[5], an->addr16[5], u), 2043 ao.addr16[6], an->addr16[6], u), 2044 ao.addr16[7], an->addr16[7], u), 2045 po, pn, u); 2046 break; 2047#endif /* INET6 */ 2048 } 2049} 2050 2051 2052/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2053void 2054pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2055{ 2056 u_int32_t ao; 2057 2058 memcpy(&ao, a, sizeof(ao)); 2059 memcpy(a, &an, sizeof(u_int32_t)); 2060 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2061 ao % 65536, an % 65536, u); 2062} 2063 2064#ifdef INET6 2065static void 2066pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2067{ 2068 struct pf_addr ao; 2069 2070 PF_ACPY(&ao, a, AF_INET6); 2071 PF_ACPY(a, an, AF_INET6); 2072 2073 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2074 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2075 pf_cksum_fixup(pf_cksum_fixup(*c, 2076 ao.addr16[0], an->addr16[0], u), 2077 ao.addr16[1], an->addr16[1], u), 2078 ao.addr16[2], an->addr16[2], u), 2079 ao.addr16[3], an->addr16[3], u), 2080 ao.addr16[4], an->addr16[4], u), 2081 ao.addr16[5], an->addr16[5], u), 2082 ao.addr16[6], an->addr16[6], u), 2083 ao.addr16[7], an->addr16[7], u); 2084} 2085#endif /* INET6 */ 2086 2087static void 2088pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2089 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2090 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2091{ 2092 struct pf_addr oia, ooa; 2093 2094 PF_ACPY(&oia, ia, af); 2095 if (oa) 2096 PF_ACPY(&ooa, oa, af); 2097 2098 /* Change inner protocol port, fix inner protocol checksum. */ 2099 if (ip != NULL) { 2100 u_int16_t oip = *ip; 2101 u_int32_t opc; 2102 2103 if (pc != NULL) 2104 opc = *pc; 2105 *ip = np; 2106 if (pc != NULL) 2107 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2108 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2109 if (pc != NULL) 2110 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2111 } 2112 /* Change inner ip address, fix inner ip and icmp checksums. */ 2113 PF_ACPY(ia, na, af); 2114 switch (af) { 2115#ifdef INET 2116 case AF_INET: { 2117 u_int32_t oh2c = *h2c; 2118 2119 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2120 oia.addr16[0], ia->addr16[0], 0), 2121 oia.addr16[1], ia->addr16[1], 0); 2122 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2123 oia.addr16[0], ia->addr16[0], 0), 2124 oia.addr16[1], ia->addr16[1], 0); 2125 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2126 break; 2127 } 2128#endif /* INET */ 2129#ifdef INET6 2130 case AF_INET6: 2131 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2132 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2133 pf_cksum_fixup(pf_cksum_fixup(*ic, 2134 oia.addr16[0], ia->addr16[0], u), 2135 oia.addr16[1], ia->addr16[1], u), 2136 oia.addr16[2], ia->addr16[2], u), 2137 oia.addr16[3], ia->addr16[3], u), 2138 oia.addr16[4], ia->addr16[4], u), 2139 oia.addr16[5], ia->addr16[5], u), 2140 oia.addr16[6], ia->addr16[6], u), 2141 oia.addr16[7], ia->addr16[7], u); 2142 break; 2143#endif /* INET6 */ 2144 } 2145 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2146 if (oa) { 2147 PF_ACPY(oa, na, af); 2148 switch (af) { 2149#ifdef INET 2150 case AF_INET: 2151 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2152 ooa.addr16[0], oa->addr16[0], 0), 2153 ooa.addr16[1], oa->addr16[1], 0); 2154 break; 2155#endif /* INET */ 2156#ifdef INET6 2157 case AF_INET6: 2158 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2159 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2160 pf_cksum_fixup(pf_cksum_fixup(*ic, 2161 ooa.addr16[0], oa->addr16[0], u), 2162 ooa.addr16[1], oa->addr16[1], u), 2163 ooa.addr16[2], oa->addr16[2], u), 2164 ooa.addr16[3], oa->addr16[3], u), 2165 ooa.addr16[4], oa->addr16[4], u), 2166 ooa.addr16[5], oa->addr16[5], u), 2167 ooa.addr16[6], oa->addr16[6], u), 2168 ooa.addr16[7], oa->addr16[7], u); 2169 break; 2170#endif /* INET6 */ 2171 } 2172 } 2173} 2174 2175 2176/* 2177 * Need to modulate the sequence numbers in the TCP SACK option 2178 * (credits to Krzysztof Pfaff for report and patch) 2179 */ 2180static int 2181pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2182 struct tcphdr *th, struct pf_state_peer *dst) 2183{ 2184 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2185 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2186 int copyback = 0, i, olen; 2187 struct sackblk sack; 2188 2189#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2190 if (hlen < TCPOLEN_SACKLEN || 2191 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2192 return 0; 2193 2194 while (hlen >= TCPOLEN_SACKLEN) { 2195 olen = opt[1]; 2196 switch (*opt) { 2197 case TCPOPT_EOL: /* FALLTHROUGH */ 2198 case TCPOPT_NOP: 2199 opt++; 2200 hlen--; 2201 break; 2202 case TCPOPT_SACK: 2203 if (olen > hlen) 2204 olen = hlen; 2205 if (olen >= TCPOLEN_SACKLEN) { 2206 for (i = 2; i + TCPOLEN_SACK <= olen; 2207 i += TCPOLEN_SACK) { 2208 memcpy(&sack, &opt[i], sizeof(sack)); 2209 pf_change_a(&sack.start, &th->th_sum, 2210 htonl(ntohl(sack.start) - 2211 dst->seqdiff), 0); 2212 pf_change_a(&sack.end, &th->th_sum, 2213 htonl(ntohl(sack.end) - 2214 dst->seqdiff), 0); 2215 memcpy(&opt[i], &sack, sizeof(sack)); 2216 } 2217 copyback = 1; 2218 } 2219 /* FALLTHROUGH */ 2220 default: 2221 if (olen < 2) 2222 olen = 2; 2223 hlen -= olen; 2224 opt += olen; 2225 } 2226 } 2227 2228 if (copyback) 2229 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2230 return (copyback); 2231} 2232 2233static void 2234pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2235 const struct pf_addr *saddr, const struct pf_addr *daddr, 2236 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2237 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2238 u_int16_t rtag, struct ifnet *ifp) 2239{ 2240 struct pf_send_entry *pfse; 2241 struct mbuf *m; 2242 int len, tlen; 2243#ifdef INET 2244 struct ip *h = NULL; 2245#endif /* INET */ 2246#ifdef INET6 2247 struct ip6_hdr *h6 = NULL; 2248#endif /* INET6 */ 2249 struct tcphdr *th; 2250 char *opt; 2251 struct pf_mtag *pf_mtag; 2252 2253 len = 0; 2254 th = NULL; 2255 2256 /* maximum segment size tcp option */ 2257 tlen = sizeof(struct tcphdr); 2258 if (mss) 2259 tlen += 4; 2260 2261 switch (af) { 2262#ifdef INET 2263 case AF_INET: 2264 len = sizeof(struct ip) + tlen; 2265 break; 2266#endif /* INET */ 2267#ifdef INET6 2268 case AF_INET6: 2269 len = sizeof(struct ip6_hdr) + tlen; 2270 break; 2271#endif /* INET6 */ 2272 default: 2273 panic("%s: unsupported af %d", __func__, af); 2274 } 2275 2276 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2277 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2278 if (pfse == NULL) 2279 return; 2280 m = m_gethdr(M_NOWAIT, MT_DATA); 2281 if (m == NULL) { 2282 free(pfse, M_PFTEMP); 2283 return; 2284 } 2285#ifdef MAC 2286 mac_netinet_firewall_send(m); 2287#endif 2288 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2289 free(pfse, M_PFTEMP); 2290 m_freem(m); 2291 return; 2292 } 2293 if (tag) 2294 m->m_flags |= M_SKIP_FIREWALL; 2295 pf_mtag->tag = rtag; 2296 2297 if (r != NULL && r->rtableid >= 0) 2298 M_SETFIB(m, r->rtableid); 2299 2300#ifdef ALTQ 2301 if (r != NULL && r->qid) { 2302 pf_mtag->qid = r->qid; 2303 2304 /* add hints for ecn */ 2305 pf_mtag->hdr = mtod(m, struct ip *); 2306 } 2307#endif /* ALTQ */ 2308 m->m_data += max_linkhdr; 2309 m->m_pkthdr.len = m->m_len = len; 2310 m->m_pkthdr.rcvif = NULL; 2311 bzero(m->m_data, len); 2312 switch (af) { 2313#ifdef INET 2314 case AF_INET: 2315 h = mtod(m, struct ip *); 2316 2317 /* IP header fields included in the TCP checksum */ 2318 h->ip_p = IPPROTO_TCP; 2319 h->ip_len = htons(tlen); 2320 h->ip_src.s_addr = saddr->v4.s_addr; 2321 h->ip_dst.s_addr = daddr->v4.s_addr; 2322 2323 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2324 break; 2325#endif /* INET */ 2326#ifdef INET6 2327 case AF_INET6: 2328 h6 = mtod(m, struct ip6_hdr *); 2329 2330 /* IP header fields included in the TCP checksum */ 2331 h6->ip6_nxt = IPPROTO_TCP; 2332 h6->ip6_plen = htons(tlen); 2333 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2334 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2335 2336 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2337 break; 2338#endif /* INET6 */ 2339 } 2340 2341 /* TCP header */ 2342 th->th_sport = sport; 2343 th->th_dport = dport; 2344 th->th_seq = htonl(seq); 2345 th->th_ack = htonl(ack); 2346 th->th_off = tlen >> 2; 2347 th->th_flags = flags; 2348 th->th_win = htons(win); 2349 2350 if (mss) { 2351 opt = (char *)(th + 1); 2352 opt[0] = TCPOPT_MAXSEG; 2353 opt[1] = 4; 2354 HTONS(mss); 2355 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2356 } 2357 2358 switch (af) { 2359#ifdef INET 2360 case AF_INET: 2361 /* TCP checksum */ 2362 th->th_sum = in_cksum(m, len); 2363 2364 /* Finish the IP header */ 2365 h->ip_v = 4; 2366 h->ip_hl = sizeof(*h) >> 2; 2367 h->ip_tos = IPTOS_LOWDELAY; 2368 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2369 h->ip_len = htons(len); 2370 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2371 h->ip_sum = 0; 2372 2373 pfse->pfse_type = PFSE_IP; 2374 break; 2375#endif /* INET */ 2376#ifdef INET6 2377 case AF_INET6: 2378 /* TCP checksum */ 2379 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2380 sizeof(struct ip6_hdr), tlen); 2381 2382 h6->ip6_vfc |= IPV6_VERSION; 2383 h6->ip6_hlim = IPV6_DEFHLIM; 2384 2385 pfse->pfse_type = PFSE_IP6; 2386 break; 2387#endif /* INET6 */ 2388 } 2389 pfse->pfse_m = m; 2390 pf_send(pfse); 2391} 2392 2393static void 2394pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2395 struct pf_rule *r) 2396{ 2397 struct pf_send_entry *pfse; 2398 struct mbuf *m0; 2399 struct pf_mtag *pf_mtag; 2400 2401 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2402 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2403 if (pfse == NULL) 2404 return; 2405 2406 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2407 free(pfse, M_PFTEMP); 2408 return; 2409 } 2410 2411 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2412 free(pfse, M_PFTEMP); 2413 return; 2414 } 2415 /* XXX: revisit */ 2416 m0->m_flags |= M_SKIP_FIREWALL; 2417 2418 if (r->rtableid >= 0) 2419 M_SETFIB(m0, r->rtableid); 2420 2421#ifdef ALTQ 2422 if (r->qid) { 2423 pf_mtag->qid = r->qid; 2424 /* add hints for ecn */ 2425 pf_mtag->hdr = mtod(m0, struct ip *); 2426 } 2427#endif /* ALTQ */ 2428 2429 switch (af) { 2430#ifdef INET 2431 case AF_INET: 2432 pfse->pfse_type = PFSE_ICMP; 2433 break; 2434#endif /* INET */ 2435#ifdef INET6 2436 case AF_INET6: 2437 pfse->pfse_type = PFSE_ICMP6; 2438 break; 2439#endif /* INET6 */ 2440 } 2441 pfse->pfse_m = m0; 2442 pfse->pfse_icmp_type = type; 2443 pfse->pfse_icmp_code = code; 2444 pf_send(pfse); 2445} 2446 2447/* 2448 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2449 * If n is 0, they match if they are equal. If n is != 0, they match if they 2450 * are different. 2451 */ 2452int 2453pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2454 struct pf_addr *b, sa_family_t af) 2455{ 2456 int match = 0; 2457 2458 switch (af) { 2459#ifdef INET 2460 case AF_INET: 2461 if ((a->addr32[0] & m->addr32[0]) == 2462 (b->addr32[0] & m->addr32[0])) 2463 match++; 2464 break; 2465#endif /* INET */ 2466#ifdef INET6 2467 case AF_INET6: 2468 if (((a->addr32[0] & m->addr32[0]) == 2469 (b->addr32[0] & m->addr32[0])) && 2470 ((a->addr32[1] & m->addr32[1]) == 2471 (b->addr32[1] & m->addr32[1])) && 2472 ((a->addr32[2] & m->addr32[2]) == 2473 (b->addr32[2] & m->addr32[2])) && 2474 ((a->addr32[3] & m->addr32[3]) == 2475 (b->addr32[3] & m->addr32[3]))) 2476 match++; 2477 break; 2478#endif /* INET6 */ 2479 } 2480 if (match) { 2481 if (n) 2482 return (0); 2483 else 2484 return (1); 2485 } else { 2486 if (n) 2487 return (1); 2488 else 2489 return (0); 2490 } 2491} 2492 2493/* 2494 * Return 1 if b <= a <= e, otherwise return 0. 2495 */ 2496int 2497pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2498 struct pf_addr *a, sa_family_t af) 2499{ 2500 switch (af) { 2501#ifdef INET 2502 case AF_INET: 2503 if ((a->addr32[0] < b->addr32[0]) || 2504 (a->addr32[0] > e->addr32[0])) 2505 return (0); 2506 break; 2507#endif /* INET */ 2508#ifdef INET6 2509 case AF_INET6: { 2510 int i; 2511 2512 /* check a >= b */ 2513 for (i = 0; i < 4; ++i) 2514 if (a->addr32[i] > b->addr32[i]) 2515 break; 2516 else if (a->addr32[i] < b->addr32[i]) 2517 return (0); 2518 /* check a <= e */ 2519 for (i = 0; i < 4; ++i) 2520 if (a->addr32[i] < e->addr32[i]) 2521 break; 2522 else if (a->addr32[i] > e->addr32[i]) 2523 return (0); 2524 break; 2525 } 2526#endif /* INET6 */ 2527 } 2528 return (1); 2529} 2530 2531static int 2532pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2533{ 2534 switch (op) { 2535 case PF_OP_IRG: 2536 return ((p > a1) && (p < a2)); 2537 case PF_OP_XRG: 2538 return ((p < a1) || (p > a2)); 2539 case PF_OP_RRG: 2540 return ((p >= a1) && (p <= a2)); 2541 case PF_OP_EQ: 2542 return (p == a1); 2543 case PF_OP_NE: 2544 return (p != a1); 2545 case PF_OP_LT: 2546 return (p < a1); 2547 case PF_OP_LE: 2548 return (p <= a1); 2549 case PF_OP_GT: 2550 return (p > a1); 2551 case PF_OP_GE: 2552 return (p >= a1); 2553 } 2554 return (0); /* never reached */ 2555} 2556 2557int 2558pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2559{ 2560 NTOHS(a1); 2561 NTOHS(a2); 2562 NTOHS(p); 2563 return (pf_match(op, a1, a2, p)); 2564} 2565 2566static int 2567pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2568{ 2569 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2570 return (0); 2571 return (pf_match(op, a1, a2, u)); 2572} 2573 2574static int 2575pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2576{ 2577 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2578 return (0); 2579 return (pf_match(op, a1, a2, g)); 2580} 2581 2582int 2583pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2584{ 2585 if (*tag == -1) 2586 *tag = mtag; 2587 2588 return ((!r->match_tag_not && r->match_tag == *tag) || 2589 (r->match_tag_not && r->match_tag != *tag)); 2590} 2591 2592int 2593pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2594{ 2595 2596 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2597 2598 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2599 return (ENOMEM); 2600 2601 pd->pf_mtag->tag = tag; 2602 2603 return (0); 2604} 2605 2606#define PF_ANCHOR_STACKSIZE 32 2607struct pf_anchor_stackframe { 2608 struct pf_ruleset *rs; 2609 struct pf_rule *r; /* XXX: + match bit */ 2610 struct pf_anchor *child; 2611}; 2612 2613/* 2614 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2615 */ 2616#define PF_ANCHORSTACK_MATCH 0x00000001 2617#define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2618 2619#define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2620#define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2621 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2622#define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2623 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2624} while (0) 2625 2626void 2627pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2628 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2629 int *match) 2630{ 2631 struct pf_anchor_stackframe *f; 2632 2633 PF_RULES_RASSERT(); 2634 2635 if (match) 2636 *match = 0; 2637 if (*depth >= PF_ANCHOR_STACKSIZE) { 2638 printf("%s: anchor stack overflow on %s\n", 2639 __func__, (*r)->anchor->name); 2640 *r = TAILQ_NEXT(*r, entries); 2641 return; 2642 } else if (*depth == 0 && a != NULL) 2643 *a = *r; 2644 f = stack + (*depth)++; 2645 f->rs = *rs; 2646 f->r = *r; 2647 if ((*r)->anchor_wildcard) { 2648 struct pf_anchor_node *parent = &(*r)->anchor->children; 2649 2650 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2651 *r = NULL; 2652 return; 2653 } 2654 *rs = &f->child->ruleset; 2655 } else { 2656 f->child = NULL; 2657 *rs = &(*r)->anchor->ruleset; 2658 } 2659 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2660} 2661 2662int 2663pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2664 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2665 int *match) 2666{ 2667 struct pf_anchor_stackframe *f; 2668 struct pf_rule *fr; 2669 int quick = 0; 2670 2671 PF_RULES_RASSERT(); 2672 2673 do { 2674 if (*depth <= 0) 2675 break; 2676 f = stack + *depth - 1; 2677 fr = PF_ANCHOR_RULE(f); 2678 if (f->child != NULL) { 2679 struct pf_anchor_node *parent; 2680 2681 /* 2682 * This block traverses through 2683 * a wildcard anchor. 2684 */ 2685 parent = &fr->anchor->children; 2686 if (match != NULL && *match) { 2687 /* 2688 * If any of "*" matched, then 2689 * "foo/ *" matched, mark frame 2690 * appropriately. 2691 */ 2692 PF_ANCHOR_SET_MATCH(f); 2693 *match = 0; 2694 } 2695 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2696 if (f->child != NULL) { 2697 *rs = &f->child->ruleset; 2698 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2699 if (*r == NULL) 2700 continue; 2701 else 2702 break; 2703 } 2704 } 2705 (*depth)--; 2706 if (*depth == 0 && a != NULL) 2707 *a = NULL; 2708 *rs = f->rs; 2709 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 2710 quick = fr->quick; 2711 *r = TAILQ_NEXT(fr, entries); 2712 } while (*r == NULL); 2713 2714 return (quick); 2715} 2716 2717#ifdef INET6 2718void 2719pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2720 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2721{ 2722 switch (af) { 2723#ifdef INET 2724 case AF_INET: 2725 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2726 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2727 break; 2728#endif /* INET */ 2729 case AF_INET6: 2730 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2731 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2732 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2733 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2734 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2735 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2736 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2737 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2738 break; 2739 } 2740} 2741 2742void 2743pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2744{ 2745 switch (af) { 2746#ifdef INET 2747 case AF_INET: 2748 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2749 break; 2750#endif /* INET */ 2751 case AF_INET6: 2752 if (addr->addr32[3] == 0xffffffff) { 2753 addr->addr32[3] = 0; 2754 if (addr->addr32[2] == 0xffffffff) { 2755 addr->addr32[2] = 0; 2756 if (addr->addr32[1] == 0xffffffff) { 2757 addr->addr32[1] = 0; 2758 addr->addr32[0] = 2759 htonl(ntohl(addr->addr32[0]) + 1); 2760 } else 2761 addr->addr32[1] = 2762 htonl(ntohl(addr->addr32[1]) + 1); 2763 } else 2764 addr->addr32[2] = 2765 htonl(ntohl(addr->addr32[2]) + 1); 2766 } else 2767 addr->addr32[3] = 2768 htonl(ntohl(addr->addr32[3]) + 1); 2769 break; 2770 } 2771} 2772#endif /* INET6 */ 2773 2774int 2775pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2776{ 2777 struct pf_addr *saddr, *daddr; 2778 u_int16_t sport, dport; 2779 struct inpcbinfo *pi; 2780 struct inpcb *inp; 2781 2782 pd->lookup.uid = UID_MAX; 2783 pd->lookup.gid = GID_MAX; 2784 2785 switch (pd->proto) { 2786 case IPPROTO_TCP: 2787 if (pd->hdr.tcp == NULL) 2788 return (-1); 2789 sport = pd->hdr.tcp->th_sport; 2790 dport = pd->hdr.tcp->th_dport; 2791 pi = &V_tcbinfo; 2792 break; 2793 case IPPROTO_UDP: 2794 if (pd->hdr.udp == NULL) 2795 return (-1); 2796 sport = pd->hdr.udp->uh_sport; 2797 dport = pd->hdr.udp->uh_dport; 2798 pi = &V_udbinfo; 2799 break; 2800 default: 2801 return (-1); 2802 } 2803 if (direction == PF_IN) { 2804 saddr = pd->src; 2805 daddr = pd->dst; 2806 } else { 2807 u_int16_t p; 2808 2809 p = sport; 2810 sport = dport; 2811 dport = p; 2812 saddr = pd->dst; 2813 daddr = pd->src; 2814 } 2815 switch (pd->af) { 2816#ifdef INET 2817 case AF_INET: 2818 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2819 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2820 if (inp == NULL) { 2821 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2822 daddr->v4, dport, INPLOOKUP_WILDCARD | 2823 INPLOOKUP_RLOCKPCB, NULL, m); 2824 if (inp == NULL) 2825 return (-1); 2826 } 2827 break; 2828#endif /* INET */ 2829#ifdef INET6 2830 case AF_INET6: 2831 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2832 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2833 if (inp == NULL) { 2834 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2835 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2836 INPLOOKUP_RLOCKPCB, NULL, m); 2837 if (inp == NULL) 2838 return (-1); 2839 } 2840 break; 2841#endif /* INET6 */ 2842 2843 default: 2844 return (-1); 2845 } 2846 INP_RLOCK_ASSERT(inp); 2847 pd->lookup.uid = inp->inp_cred->cr_uid; 2848 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2849 INP_RUNLOCK(inp); 2850 2851 return (1); 2852} 2853 2854static u_int8_t 2855pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2856{ 2857 int hlen; 2858 u_int8_t hdr[60]; 2859 u_int8_t *opt, optlen; 2860 u_int8_t wscale = 0; 2861 2862 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2863 if (hlen <= sizeof(struct tcphdr)) 2864 return (0); 2865 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2866 return (0); 2867 opt = hdr + sizeof(struct tcphdr); 2868 hlen -= sizeof(struct tcphdr); 2869 while (hlen >= 3) { 2870 switch (*opt) { 2871 case TCPOPT_EOL: 2872 case TCPOPT_NOP: 2873 ++opt; 2874 --hlen; 2875 break; 2876 case TCPOPT_WINDOW: 2877 wscale = opt[2]; 2878 if (wscale > TCP_MAX_WINSHIFT) 2879 wscale = TCP_MAX_WINSHIFT; 2880 wscale |= PF_WSCALE_FLAG; 2881 /* FALLTHROUGH */ 2882 default: 2883 optlen = opt[1]; 2884 if (optlen < 2) 2885 optlen = 2; 2886 hlen -= optlen; 2887 opt += optlen; 2888 break; 2889 } 2890 } 2891 return (wscale); 2892} 2893 2894static u_int16_t 2895pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2896{ 2897 int hlen; 2898 u_int8_t hdr[60]; 2899 u_int8_t *opt, optlen; 2900 u_int16_t mss = V_tcp_mssdflt; 2901 2902 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2903 if (hlen <= sizeof(struct tcphdr)) 2904 return (0); 2905 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2906 return (0); 2907 opt = hdr + sizeof(struct tcphdr); 2908 hlen -= sizeof(struct tcphdr); 2909 while (hlen >= TCPOLEN_MAXSEG) { 2910 switch (*opt) { 2911 case TCPOPT_EOL: 2912 case TCPOPT_NOP: 2913 ++opt; 2914 --hlen; 2915 break; 2916 case TCPOPT_MAXSEG: 2917 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2918 NTOHS(mss); 2919 /* FALLTHROUGH */ 2920 default: 2921 optlen = opt[1]; 2922 if (optlen < 2) 2923 optlen = 2; 2924 hlen -= optlen; 2925 opt += optlen; 2926 break; 2927 } 2928 } 2929 return (mss); 2930} 2931 2932static u_int16_t 2933pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 2934{ 2935#ifdef INET 2936 struct sockaddr_in *dst; 2937 struct route ro; 2938#endif /* INET */ 2939#ifdef INET6 2940 struct sockaddr_in6 *dst6; 2941 struct route_in6 ro6; 2942#endif /* INET6 */ 2943 struct rtentry *rt = NULL; 2944 int hlen = 0; 2945 u_int16_t mss = V_tcp_mssdflt; 2946 2947 switch (af) { 2948#ifdef INET 2949 case AF_INET: 2950 hlen = sizeof(struct ip); 2951 bzero(&ro, sizeof(ro)); 2952 dst = (struct sockaddr_in *)&ro.ro_dst; 2953 dst->sin_family = AF_INET; 2954 dst->sin_len = sizeof(*dst); 2955 dst->sin_addr = addr->v4; 2956 in_rtalloc_ign(&ro, 0, rtableid); 2957 rt = ro.ro_rt; 2958 break; 2959#endif /* INET */ 2960#ifdef INET6 2961 case AF_INET6: 2962 hlen = sizeof(struct ip6_hdr); 2963 bzero(&ro6, sizeof(ro6)); 2964 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2965 dst6->sin6_family = AF_INET6; 2966 dst6->sin6_len = sizeof(*dst6); 2967 dst6->sin6_addr = addr->v6; 2968 in6_rtalloc_ign(&ro6, 0, rtableid); 2969 rt = ro6.ro_rt; 2970 break; 2971#endif /* INET6 */ 2972 } 2973 2974 if (rt && rt->rt_ifp) { 2975 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2976 mss = max(V_tcp_mssdflt, mss); 2977 RTFREE(rt); 2978 } 2979 mss = min(mss, offer); 2980 mss = max(mss, 64); /* sanity - at least max opt space */ 2981 return (mss); 2982} 2983 2984static u_int32_t 2985pf_tcp_iss(struct pf_pdesc *pd) 2986{ 2987 MD5_CTX ctx; 2988 u_int32_t digest[4]; 2989 2990 if (V_pf_tcp_secret_init == 0) { 2991 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 2992 MD5Init(&V_pf_tcp_secret_ctx); 2993 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 2994 sizeof(V_pf_tcp_secret)); 2995 V_pf_tcp_secret_init = 1; 2996 } 2997 2998 ctx = V_pf_tcp_secret_ctx; 2999 3000 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3001 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3002 if (pd->af == AF_INET6) { 3003 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3004 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3005 } else { 3006 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3007 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3008 } 3009 MD5Final((u_char *)digest, &ctx); 3010 V_pf_tcp_iss_off += 4096; 3011#define ISN_RANDOM_INCREMENT (4096 - 1) 3012 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 3013 V_pf_tcp_iss_off); 3014#undef ISN_RANDOM_INCREMENT 3015} 3016 3017static int 3018pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3019 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 3020 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 3021{ 3022 struct pf_rule *nr = NULL; 3023 struct pf_addr * const saddr = pd->src; 3024 struct pf_addr * const daddr = pd->dst; 3025 sa_family_t af = pd->af; 3026 struct pf_rule *r, *a = NULL; 3027 struct pf_ruleset *ruleset = NULL; 3028 struct pf_src_node *nsn = NULL; 3029 struct tcphdr *th = pd->hdr.tcp; 3030 struct pf_state_key *sk = NULL, *nk = NULL; 3031 u_short reason; 3032 int rewrite = 0, hdrlen = 0; 3033 int tag = -1, rtableid = -1; 3034 int asd = 0; 3035 int match = 0; 3036 int state_icmp = 0; 3037 u_int16_t sport = 0, dport = 0; 3038 u_int16_t bproto_sum = 0, bip_sum = 0; 3039 u_int8_t icmptype = 0, icmpcode = 0; 3040 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3041 3042 PF_RULES_RASSERT(); 3043 3044 if (inp != NULL) { 3045 INP_LOCK_ASSERT(inp); 3046 pd->lookup.uid = inp->inp_cred->cr_uid; 3047 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3048 pd->lookup.done = 1; 3049 } 3050 3051 switch (pd->proto) { 3052 case IPPROTO_TCP: 3053 sport = th->th_sport; 3054 dport = th->th_dport; 3055 hdrlen = sizeof(*th); 3056 break; 3057 case IPPROTO_UDP: 3058 sport = pd->hdr.udp->uh_sport; 3059 dport = pd->hdr.udp->uh_dport; 3060 hdrlen = sizeof(*pd->hdr.udp); 3061 break; 3062#ifdef INET 3063 case IPPROTO_ICMP: 3064 if (pd->af != AF_INET) 3065 break; 3066 sport = dport = pd->hdr.icmp->icmp_id; 3067 hdrlen = sizeof(*pd->hdr.icmp); 3068 icmptype = pd->hdr.icmp->icmp_type; 3069 icmpcode = pd->hdr.icmp->icmp_code; 3070 3071 if (icmptype == ICMP_UNREACH || 3072 icmptype == ICMP_SOURCEQUENCH || 3073 icmptype == ICMP_REDIRECT || 3074 icmptype == ICMP_TIMXCEED || 3075 icmptype == ICMP_PARAMPROB) 3076 state_icmp++; 3077 break; 3078#endif /* INET */ 3079#ifdef INET6 3080 case IPPROTO_ICMPV6: 3081 if (af != AF_INET6) 3082 break; 3083 sport = dport = pd->hdr.icmp6->icmp6_id; 3084 hdrlen = sizeof(*pd->hdr.icmp6); 3085 icmptype = pd->hdr.icmp6->icmp6_type; 3086 icmpcode = pd->hdr.icmp6->icmp6_code; 3087 3088 if (icmptype == ICMP6_DST_UNREACH || 3089 icmptype == ICMP6_PACKET_TOO_BIG || 3090 icmptype == ICMP6_TIME_EXCEEDED || 3091 icmptype == ICMP6_PARAM_PROB) 3092 state_icmp++; 3093 break; 3094#endif /* INET6 */ 3095 default: 3096 sport = dport = hdrlen = 0; 3097 break; 3098 } 3099 3100 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3101 3102 /* check packet for BINAT/NAT/RDR */ 3103 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3104 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3105 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3106 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3107 3108 if (pd->ip_sum) 3109 bip_sum = *pd->ip_sum; 3110 3111 switch (pd->proto) { 3112 case IPPROTO_TCP: 3113 bproto_sum = th->th_sum; 3114 pd->proto_sum = &th->th_sum; 3115 3116 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3117 nk->port[pd->sidx] != sport) { 3118 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3119 &th->th_sum, &nk->addr[pd->sidx], 3120 nk->port[pd->sidx], 0, af); 3121 pd->sport = &th->th_sport; 3122 sport = th->th_sport; 3123 } 3124 3125 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3126 nk->port[pd->didx] != dport) { 3127 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3128 &th->th_sum, &nk->addr[pd->didx], 3129 nk->port[pd->didx], 0, af); 3130 dport = th->th_dport; 3131 pd->dport = &th->th_dport; 3132 } 3133 rewrite++; 3134 break; 3135 case IPPROTO_UDP: 3136 bproto_sum = pd->hdr.udp->uh_sum; 3137 pd->proto_sum = &pd->hdr.udp->uh_sum; 3138 3139 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3140 nk->port[pd->sidx] != sport) { 3141 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3142 pd->ip_sum, &pd->hdr.udp->uh_sum, 3143 &nk->addr[pd->sidx], 3144 nk->port[pd->sidx], 1, af); 3145 sport = pd->hdr.udp->uh_sport; 3146 pd->sport = &pd->hdr.udp->uh_sport; 3147 } 3148 3149 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3150 nk->port[pd->didx] != dport) { 3151 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3152 pd->ip_sum, &pd->hdr.udp->uh_sum, 3153 &nk->addr[pd->didx], 3154 nk->port[pd->didx], 1, af); 3155 dport = pd->hdr.udp->uh_dport; 3156 pd->dport = &pd->hdr.udp->uh_dport; 3157 } 3158 rewrite++; 3159 break; 3160#ifdef INET 3161 case IPPROTO_ICMP: 3162 nk->port[0] = nk->port[1]; 3163 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3164 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3165 nk->addr[pd->sidx].v4.s_addr, 0); 3166 3167 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3168 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3169 nk->addr[pd->didx].v4.s_addr, 0); 3170 3171 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3172 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3173 pd->hdr.icmp->icmp_cksum, sport, 3174 nk->port[1], 0); 3175 pd->hdr.icmp->icmp_id = nk->port[1]; 3176 pd->sport = &pd->hdr.icmp->icmp_id; 3177 } 3178 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3179 break; 3180#endif /* INET */ 3181#ifdef INET6 3182 case IPPROTO_ICMPV6: 3183 nk->port[0] = nk->port[1]; 3184 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3185 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3186 &nk->addr[pd->sidx], 0); 3187 3188 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3189 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3190 &nk->addr[pd->didx], 0); 3191 rewrite++; 3192 break; 3193#endif /* INET */ 3194 default: 3195 switch (af) { 3196#ifdef INET 3197 case AF_INET: 3198 if (PF_ANEQ(saddr, 3199 &nk->addr[pd->sidx], AF_INET)) 3200 pf_change_a(&saddr->v4.s_addr, 3201 pd->ip_sum, 3202 nk->addr[pd->sidx].v4.s_addr, 0); 3203 3204 if (PF_ANEQ(daddr, 3205 &nk->addr[pd->didx], AF_INET)) 3206 pf_change_a(&daddr->v4.s_addr, 3207 pd->ip_sum, 3208 nk->addr[pd->didx].v4.s_addr, 0); 3209 break; 3210#endif /* INET */ 3211#ifdef INET6 3212 case AF_INET6: 3213 if (PF_ANEQ(saddr, 3214 &nk->addr[pd->sidx], AF_INET6)) 3215 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3216 3217 if (PF_ANEQ(daddr, 3218 &nk->addr[pd->didx], AF_INET6)) 3219 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3220 break; 3221#endif /* INET */ 3222 } 3223 break; 3224 } 3225 if (nr->natpass) 3226 r = NULL; 3227 pd->nat_rule = nr; 3228 } 3229 3230 while (r != NULL) { 3231 r->evaluations++; 3232 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3233 r = r->skip[PF_SKIP_IFP].ptr; 3234 else if (r->direction && r->direction != direction) 3235 r = r->skip[PF_SKIP_DIR].ptr; 3236 else if (r->af && r->af != af) 3237 r = r->skip[PF_SKIP_AF].ptr; 3238 else if (r->proto && r->proto != pd->proto) 3239 r = r->skip[PF_SKIP_PROTO].ptr; 3240 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3241 r->src.neg, kif, M_GETFIB(m))) 3242 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3243 /* tcp/udp only. port_op always 0 in other cases */ 3244 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3245 r->src.port[0], r->src.port[1], sport)) 3246 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3247 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3248 r->dst.neg, NULL, M_GETFIB(m))) 3249 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3250 /* tcp/udp only. port_op always 0 in other cases */ 3251 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3252 r->dst.port[0], r->dst.port[1], dport)) 3253 r = r->skip[PF_SKIP_DST_PORT].ptr; 3254 /* icmp only. type always 0 in other cases */ 3255 else if (r->type && r->type != icmptype + 1) 3256 r = TAILQ_NEXT(r, entries); 3257 /* icmp only. type always 0 in other cases */ 3258 else if (r->code && r->code != icmpcode + 1) 3259 r = TAILQ_NEXT(r, entries); 3260 else if (r->tos && !(r->tos == pd->tos)) 3261 r = TAILQ_NEXT(r, entries); 3262 else if (r->rule_flag & PFRULE_FRAGMENT) 3263 r = TAILQ_NEXT(r, entries); 3264 else if (pd->proto == IPPROTO_TCP && 3265 (r->flagset & th->th_flags) != r->flags) 3266 r = TAILQ_NEXT(r, entries); 3267 /* tcp/udp only. uid.op always 0 in other cases */ 3268 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3269 pf_socket_lookup(direction, pd, m), 1)) && 3270 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3271 pd->lookup.uid)) 3272 r = TAILQ_NEXT(r, entries); 3273 /* tcp/udp only. gid.op always 0 in other cases */ 3274 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3275 pf_socket_lookup(direction, pd, m), 1)) && 3276 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3277 pd->lookup.gid)) 3278 r = TAILQ_NEXT(r, entries); 3279 else if (r->prob && 3280 r->prob <= arc4random()) 3281 r = TAILQ_NEXT(r, entries); 3282 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3283 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3284 r = TAILQ_NEXT(r, entries); 3285 else if (r->os_fingerprint != PF_OSFP_ANY && 3286 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3287 pf_osfp_fingerprint(pd, m, off, th), 3288 r->os_fingerprint))) 3289 r = TAILQ_NEXT(r, entries); 3290 else { 3291 if (r->tag) 3292 tag = r->tag; 3293 if (r->rtableid >= 0) 3294 rtableid = r->rtableid; 3295 if (r->anchor == NULL) { 3296 match = 1; 3297 *rm = r; 3298 *am = a; 3299 *rsm = ruleset; 3300 if ((*rm)->quick) 3301 break; 3302 r = TAILQ_NEXT(r, entries); 3303 } else 3304 pf_step_into_anchor(anchor_stack, &asd, 3305 &ruleset, PF_RULESET_FILTER, &r, &a, 3306 &match); 3307 } 3308 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3309 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3310 break; 3311 } 3312 r = *rm; 3313 a = *am; 3314 ruleset = *rsm; 3315 3316 REASON_SET(&reason, PFRES_MATCH); 3317 3318 if (r->log || (nr != NULL && nr->log)) { 3319 if (rewrite) 3320 m_copyback(m, off, hdrlen, pd->hdr.any); 3321 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3322 ruleset, pd, 1); 3323 } 3324 3325 if ((r->action == PF_DROP) && 3326 ((r->rule_flag & PFRULE_RETURNRST) || 3327 (r->rule_flag & PFRULE_RETURNICMP) || 3328 (r->rule_flag & PFRULE_RETURN))) { 3329 /* undo NAT changes, if they have taken place */ 3330 if (nr != NULL) { 3331 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3332 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3333 if (pd->sport) 3334 *pd->sport = sk->port[pd->sidx]; 3335 if (pd->dport) 3336 *pd->dport = sk->port[pd->didx]; 3337 if (pd->proto_sum) 3338 *pd->proto_sum = bproto_sum; 3339 if (pd->ip_sum) 3340 *pd->ip_sum = bip_sum; 3341 m_copyback(m, off, hdrlen, pd->hdr.any); 3342 } 3343 if (pd->proto == IPPROTO_TCP && 3344 ((r->rule_flag & PFRULE_RETURNRST) || 3345 (r->rule_flag & PFRULE_RETURN)) && 3346 !(th->th_flags & TH_RST)) { 3347 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3348 int len = 0; 3349#ifdef INET 3350 struct ip *h4; 3351#endif 3352#ifdef INET6 3353 struct ip6_hdr *h6; 3354#endif 3355 3356 switch (af) { 3357#ifdef INET 3358 case AF_INET: 3359 h4 = mtod(m, struct ip *); 3360 len = ntohs(h4->ip_len) - off; 3361 break; 3362#endif 3363#ifdef INET6 3364 case AF_INET6: 3365 h6 = mtod(m, struct ip6_hdr *); 3366 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3367 break; 3368#endif 3369 } 3370 3371 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3372 REASON_SET(&reason, PFRES_PROTCKSUM); 3373 else { 3374 if (th->th_flags & TH_SYN) 3375 ack++; 3376 if (th->th_flags & TH_FIN) 3377 ack++; 3378 pf_send_tcp(m, r, af, pd->dst, 3379 pd->src, th->th_dport, th->th_sport, 3380 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3381 r->return_ttl, 1, 0, kif->pfik_ifp); 3382 } 3383 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3384 r->return_icmp) 3385 pf_send_icmp(m, r->return_icmp >> 8, 3386 r->return_icmp & 255, af, r); 3387 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3388 r->return_icmp6) 3389 pf_send_icmp(m, r->return_icmp6 >> 8, 3390 r->return_icmp6 & 255, af, r); 3391 } 3392 3393 if (r->action == PF_DROP) 3394 goto cleanup; 3395 3396 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3397 REASON_SET(&reason, PFRES_MEMORY); 3398 goto cleanup; 3399 } 3400 if (rtableid >= 0) 3401 M_SETFIB(m, rtableid); 3402 3403 if (!state_icmp && (r->keep_state || nr != NULL || 3404 (pd->flags & PFDESC_TCP_NORM))) { 3405 int action; 3406 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3407 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3408 hdrlen); 3409 if (action != PF_PASS) 3410 return (action); 3411 } else { 3412 if (sk != NULL) 3413 uma_zfree(V_pf_state_key_z, sk); 3414 if (nk != NULL) 3415 uma_zfree(V_pf_state_key_z, nk); 3416 } 3417 3418 /* copy back packet headers if we performed NAT operations */ 3419 if (rewrite) 3420 m_copyback(m, off, hdrlen, pd->hdr.any); 3421 3422 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3423 direction == PF_OUT && 3424 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3425 /* 3426 * We want the state created, but we dont 3427 * want to send this in case a partner 3428 * firewall has to know about it to allow 3429 * replies through it. 3430 */ 3431 return (PF_DEFER); 3432 3433 return (PF_PASS); 3434 3435cleanup: 3436 if (sk != NULL) 3437 uma_zfree(V_pf_state_key_z, sk); 3438 if (nk != NULL) 3439 uma_zfree(V_pf_state_key_z, nk); 3440 return (PF_DROP); 3441} 3442 3443static int 3444pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3445 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3446 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3447 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3448 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3449{ 3450 struct pf_state *s = NULL; 3451 struct pf_src_node *sn = NULL; 3452 struct tcphdr *th = pd->hdr.tcp; 3453 u_int16_t mss = V_tcp_mssdflt; 3454 u_short reason; 3455 3456 /* check maximums */ 3457 if (r->max_states && 3458 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 3459 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 3460 REASON_SET(&reason, PFRES_MAXSTATES); 3461 return (PF_DROP); 3462 } 3463 /* src node for filter rule */ 3464 if ((r->rule_flag & PFRULE_SRCTRACK || 3465 r->rpool.opts & PF_POOL_STICKYADDR) && 3466 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3467 REASON_SET(&reason, PFRES_SRCLIMIT); 3468 goto csfailed; 3469 } 3470 /* src node for translation rule */ 3471 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3472 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3473 REASON_SET(&reason, PFRES_SRCLIMIT); 3474 goto csfailed; 3475 } 3476 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3477 if (s == NULL) { 3478 REASON_SET(&reason, PFRES_MEMORY); 3479 goto csfailed; 3480 } 3481 s->rule.ptr = r; 3482 s->nat_rule.ptr = nr; 3483 s->anchor.ptr = a; 3484 STATE_INC_COUNTERS(s); 3485 if (r->allow_opts) 3486 s->state_flags |= PFSTATE_ALLOWOPTS; 3487 if (r->rule_flag & PFRULE_STATESLOPPY) 3488 s->state_flags |= PFSTATE_SLOPPY; 3489 s->log = r->log & PF_LOG_ALL; 3490 s->sync_state = PFSYNC_S_NONE; 3491 if (nr != NULL) 3492 s->log |= nr->log & PF_LOG_ALL; 3493 switch (pd->proto) { 3494 case IPPROTO_TCP: 3495 s->src.seqlo = ntohl(th->th_seq); 3496 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3497 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3498 r->keep_state == PF_STATE_MODULATE) { 3499 /* Generate sequence number modulator */ 3500 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3501 0) 3502 s->src.seqdiff = 1; 3503 pf_change_a(&th->th_seq, &th->th_sum, 3504 htonl(s->src.seqlo + s->src.seqdiff), 0); 3505 *rewrite = 1; 3506 } else 3507 s->src.seqdiff = 0; 3508 if (th->th_flags & TH_SYN) { 3509 s->src.seqhi++; 3510 s->src.wscale = pf_get_wscale(m, off, 3511 th->th_off, pd->af); 3512 } 3513 s->src.max_win = MAX(ntohs(th->th_win), 1); 3514 if (s->src.wscale & PF_WSCALE_MASK) { 3515 /* Remove scale factor from initial window */ 3516 int win = s->src.max_win; 3517 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3518 s->src.max_win = (win - 1) >> 3519 (s->src.wscale & PF_WSCALE_MASK); 3520 } 3521 if (th->th_flags & TH_FIN) 3522 s->src.seqhi++; 3523 s->dst.seqhi = 1; 3524 s->dst.max_win = 1; 3525 s->src.state = TCPS_SYN_SENT; 3526 s->dst.state = TCPS_CLOSED; 3527 s->timeout = PFTM_TCP_FIRST_PACKET; 3528 break; 3529 case IPPROTO_UDP: 3530 s->src.state = PFUDPS_SINGLE; 3531 s->dst.state = PFUDPS_NO_TRAFFIC; 3532 s->timeout = PFTM_UDP_FIRST_PACKET; 3533 break; 3534 case IPPROTO_ICMP: 3535#ifdef INET6 3536 case IPPROTO_ICMPV6: 3537#endif 3538 s->timeout = PFTM_ICMP_FIRST_PACKET; 3539 break; 3540 default: 3541 s->src.state = PFOTHERS_SINGLE; 3542 s->dst.state = PFOTHERS_NO_TRAFFIC; 3543 s->timeout = PFTM_OTHER_FIRST_PACKET; 3544 } 3545 3546 if (r->rt && r->rt != PF_FASTROUTE) { 3547 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) { 3548 REASON_SET(&reason, PFRES_BADSTATE); 3549 pf_src_tree_remove_state(s); 3550 STATE_DEC_COUNTERS(s); 3551 uma_zfree(V_pf_state_z, s); 3552 goto csfailed; 3553 } 3554 s->rt_kif = r->rpool.cur->kif; 3555 } 3556 3557 s->creation = time_uptime; 3558 s->expire = time_uptime; 3559 3560 if (sn != NULL) 3561 s->src_node = sn; 3562 if (nsn != NULL) { 3563 /* XXX We only modify one side for now. */ 3564 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3565 s->nat_src_node = nsn; 3566 } 3567 if (pd->proto == IPPROTO_TCP) { 3568 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3569 off, pd, th, &s->src, &s->dst)) { 3570 REASON_SET(&reason, PFRES_MEMORY); 3571 pf_src_tree_remove_state(s); 3572 STATE_DEC_COUNTERS(s); 3573 uma_zfree(V_pf_state_z, s); 3574 return (PF_DROP); 3575 } 3576 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3577 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3578 &s->src, &s->dst, rewrite)) { 3579 /* This really shouldn't happen!!! */ 3580 DPFPRINTF(PF_DEBUG_URGENT, 3581 ("pf_normalize_tcp_stateful failed on first pkt")); 3582 pf_normalize_tcp_cleanup(s); 3583 pf_src_tree_remove_state(s); 3584 STATE_DEC_COUNTERS(s); 3585 uma_zfree(V_pf_state_z, s); 3586 return (PF_DROP); 3587 } 3588 } 3589 s->direction = pd->dir; 3590 3591 /* 3592 * sk/nk could already been setup by pf_get_translation(). 3593 */ 3594 if (nr == NULL) { 3595 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3596 __func__, nr, sk, nk)); 3597 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3598 if (sk == NULL) 3599 goto csfailed; 3600 nk = sk; 3601 } else 3602 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3603 __func__, nr, sk, nk)); 3604 3605 /* Swap sk/nk for PF_OUT. */ 3606 if (pf_state_insert(BOUND_IFACE(r, kif), 3607 (pd->dir == PF_IN) ? sk : nk, 3608 (pd->dir == PF_IN) ? nk : sk, s)) { 3609 if (pd->proto == IPPROTO_TCP) 3610 pf_normalize_tcp_cleanup(s); 3611 REASON_SET(&reason, PFRES_STATEINS); 3612 pf_src_tree_remove_state(s); 3613 STATE_DEC_COUNTERS(s); 3614 uma_zfree(V_pf_state_z, s); 3615 return (PF_DROP); 3616 } else 3617 *sm = s; 3618 3619 if (tag > 0) 3620 s->tag = tag; 3621 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3622 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3623 s->src.state = PF_TCPS_PROXY_SRC; 3624 /* undo NAT changes, if they have taken place */ 3625 if (nr != NULL) { 3626 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3627 if (pd->dir == PF_OUT) 3628 skt = s->key[PF_SK_STACK]; 3629 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3630 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3631 if (pd->sport) 3632 *pd->sport = skt->port[pd->sidx]; 3633 if (pd->dport) 3634 *pd->dport = skt->port[pd->didx]; 3635 if (pd->proto_sum) 3636 *pd->proto_sum = bproto_sum; 3637 if (pd->ip_sum) 3638 *pd->ip_sum = bip_sum; 3639 m_copyback(m, off, hdrlen, pd->hdr.any); 3640 } 3641 s->src.seqhi = htonl(arc4random()); 3642 /* Find mss option */ 3643 int rtid = M_GETFIB(m); 3644 mss = pf_get_mss(m, off, th->th_off, pd->af); 3645 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3646 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3647 s->src.mss = mss; 3648 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3649 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3650 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3651 REASON_SET(&reason, PFRES_SYNPROXY); 3652 return (PF_SYNPROXY_DROP); 3653 } 3654 3655 return (PF_PASS); 3656 3657csfailed: 3658 if (sk != NULL) 3659 uma_zfree(V_pf_state_key_z, sk); 3660 if (nk != NULL) 3661 uma_zfree(V_pf_state_key_z, nk); 3662 3663 if (sn != NULL) { 3664 struct pf_srchash *sh; 3665 3666 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 3667 PF_HASHROW_LOCK(sh); 3668 if (--sn->states == 0 && sn->expire == 0) { 3669 pf_unlink_src_node(sn); 3670 uma_zfree(V_pf_sources_z, sn); 3671 counter_u64_add( 3672 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 3673 } 3674 PF_HASHROW_UNLOCK(sh); 3675 } 3676 3677 if (nsn != sn && nsn != NULL) { 3678 struct pf_srchash *sh; 3679 3680 sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)]; 3681 PF_HASHROW_LOCK(sh); 3682 if (--nsn->states == 1 && nsn->expire == 0) { 3683 pf_unlink_src_node(nsn); 3684 uma_zfree(V_pf_sources_z, nsn); 3685 counter_u64_add( 3686 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 3687 } 3688 PF_HASHROW_UNLOCK(sh); 3689 } 3690 3691 return (PF_DROP); 3692} 3693 3694static int 3695pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3696 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3697 struct pf_ruleset **rsm) 3698{ 3699 struct pf_rule *r, *a = NULL; 3700 struct pf_ruleset *ruleset = NULL; 3701 sa_family_t af = pd->af; 3702 u_short reason; 3703 int tag = -1; 3704 int asd = 0; 3705 int match = 0; 3706 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3707 3708 PF_RULES_RASSERT(); 3709 3710 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3711 while (r != NULL) { 3712 r->evaluations++; 3713 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3714 r = r->skip[PF_SKIP_IFP].ptr; 3715 else if (r->direction && r->direction != direction) 3716 r = r->skip[PF_SKIP_DIR].ptr; 3717 else if (r->af && r->af != af) 3718 r = r->skip[PF_SKIP_AF].ptr; 3719 else if (r->proto && r->proto != pd->proto) 3720 r = r->skip[PF_SKIP_PROTO].ptr; 3721 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3722 r->src.neg, kif, M_GETFIB(m))) 3723 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3724 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3725 r->dst.neg, NULL, M_GETFIB(m))) 3726 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3727 else if (r->tos && !(r->tos == pd->tos)) 3728 r = TAILQ_NEXT(r, entries); 3729 else if (r->os_fingerprint != PF_OSFP_ANY) 3730 r = TAILQ_NEXT(r, entries); 3731 else if (pd->proto == IPPROTO_UDP && 3732 (r->src.port_op || r->dst.port_op)) 3733 r = TAILQ_NEXT(r, entries); 3734 else if (pd->proto == IPPROTO_TCP && 3735 (r->src.port_op || r->dst.port_op || r->flagset)) 3736 r = TAILQ_NEXT(r, entries); 3737 else if ((pd->proto == IPPROTO_ICMP || 3738 pd->proto == IPPROTO_ICMPV6) && 3739 (r->type || r->code)) 3740 r = TAILQ_NEXT(r, entries); 3741 else if (r->prob && r->prob <= 3742 (arc4random() % (UINT_MAX - 1) + 1)) 3743 r = TAILQ_NEXT(r, entries); 3744 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3745 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3746 r = TAILQ_NEXT(r, entries); 3747 else { 3748 if (r->anchor == NULL) { 3749 match = 1; 3750 *rm = r; 3751 *am = a; 3752 *rsm = ruleset; 3753 if ((*rm)->quick) 3754 break; 3755 r = TAILQ_NEXT(r, entries); 3756 } else 3757 pf_step_into_anchor(anchor_stack, &asd, 3758 &ruleset, PF_RULESET_FILTER, &r, &a, 3759 &match); 3760 } 3761 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3762 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3763 break; 3764 } 3765 r = *rm; 3766 a = *am; 3767 ruleset = *rsm; 3768 3769 REASON_SET(&reason, PFRES_MATCH); 3770 3771 if (r->log) 3772 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3773 1); 3774 3775 if (r->action != PF_PASS) 3776 return (PF_DROP); 3777 3778 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3779 REASON_SET(&reason, PFRES_MEMORY); 3780 return (PF_DROP); 3781 } 3782 3783 return (PF_PASS); 3784} 3785 3786static int 3787pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3788 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3789 struct pf_pdesc *pd, u_short *reason, int *copyback) 3790{ 3791 struct tcphdr *th = pd->hdr.tcp; 3792 u_int16_t win = ntohs(th->th_win); 3793 u_int32_t ack, end, seq, orig_seq; 3794 u_int8_t sws, dws; 3795 int ackskew; 3796 3797 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3798 sws = src->wscale & PF_WSCALE_MASK; 3799 dws = dst->wscale & PF_WSCALE_MASK; 3800 } else 3801 sws = dws = 0; 3802 3803 /* 3804 * Sequence tracking algorithm from Guido van Rooij's paper: 3805 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3806 * tcp_filtering.ps 3807 */ 3808 3809 orig_seq = seq = ntohl(th->th_seq); 3810 if (src->seqlo == 0) { 3811 /* First packet from this end. Set its state */ 3812 3813 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3814 src->scrub == NULL) { 3815 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3816 REASON_SET(reason, PFRES_MEMORY); 3817 return (PF_DROP); 3818 } 3819 } 3820 3821 /* Deferred generation of sequence number modulator */ 3822 if (dst->seqdiff && !src->seqdiff) { 3823 /* use random iss for the TCP server */ 3824 while ((src->seqdiff = arc4random() - seq) == 0) 3825 ; 3826 ack = ntohl(th->th_ack) - dst->seqdiff; 3827 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3828 src->seqdiff), 0); 3829 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3830 *copyback = 1; 3831 } else { 3832 ack = ntohl(th->th_ack); 3833 } 3834 3835 end = seq + pd->p_len; 3836 if (th->th_flags & TH_SYN) { 3837 end++; 3838 if (dst->wscale & PF_WSCALE_FLAG) { 3839 src->wscale = pf_get_wscale(m, off, th->th_off, 3840 pd->af); 3841 if (src->wscale & PF_WSCALE_FLAG) { 3842 /* Remove scale factor from initial 3843 * window */ 3844 sws = src->wscale & PF_WSCALE_MASK; 3845 win = ((u_int32_t)win + (1 << sws) - 1) 3846 >> sws; 3847 dws = dst->wscale & PF_WSCALE_MASK; 3848 } else { 3849 /* fixup other window */ 3850 dst->max_win <<= dst->wscale & 3851 PF_WSCALE_MASK; 3852 /* in case of a retrans SYN|ACK */ 3853 dst->wscale = 0; 3854 } 3855 } 3856 } 3857 if (th->th_flags & TH_FIN) 3858 end++; 3859 3860 src->seqlo = seq; 3861 if (src->state < TCPS_SYN_SENT) 3862 src->state = TCPS_SYN_SENT; 3863 3864 /* 3865 * May need to slide the window (seqhi may have been set by 3866 * the crappy stack check or if we picked up the connection 3867 * after establishment) 3868 */ 3869 if (src->seqhi == 1 || 3870 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3871 src->seqhi = end + MAX(1, dst->max_win << dws); 3872 if (win > src->max_win) 3873 src->max_win = win; 3874 3875 } else { 3876 ack = ntohl(th->th_ack) - dst->seqdiff; 3877 if (src->seqdiff) { 3878 /* Modulate sequence numbers */ 3879 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3880 src->seqdiff), 0); 3881 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3882 *copyback = 1; 3883 } 3884 end = seq + pd->p_len; 3885 if (th->th_flags & TH_SYN) 3886 end++; 3887 if (th->th_flags & TH_FIN) 3888 end++; 3889 } 3890 3891 if ((th->th_flags & TH_ACK) == 0) { 3892 /* Let it pass through the ack skew check */ 3893 ack = dst->seqlo; 3894 } else if ((ack == 0 && 3895 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3896 /* broken tcp stacks do not set ack */ 3897 (dst->state < TCPS_SYN_SENT)) { 3898 /* 3899 * Many stacks (ours included) will set the ACK number in an 3900 * FIN|ACK if the SYN times out -- no sequence to ACK. 3901 */ 3902 ack = dst->seqlo; 3903 } 3904 3905 if (seq == end) { 3906 /* Ease sequencing restrictions on no data packets */ 3907 seq = src->seqlo; 3908 end = seq; 3909 } 3910 3911 ackskew = dst->seqlo - ack; 3912 3913 3914 /* 3915 * Need to demodulate the sequence numbers in any TCP SACK options 3916 * (Selective ACK). We could optionally validate the SACK values 3917 * against the current ACK window, either forwards or backwards, but 3918 * I'm not confident that SACK has been implemented properly 3919 * everywhere. It wouldn't surprise me if several stacks accidently 3920 * SACK too far backwards of previously ACKed data. There really aren't 3921 * any security implications of bad SACKing unless the target stack 3922 * doesn't validate the option length correctly. Someone trying to 3923 * spoof into a TCP connection won't bother blindly sending SACK 3924 * options anyway. 3925 */ 3926 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 3927 if (pf_modulate_sack(m, off, pd, th, dst)) 3928 *copyback = 1; 3929 } 3930 3931 3932#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3933 if (SEQ_GEQ(src->seqhi, end) && 3934 /* Last octet inside other's window space */ 3935 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3936 /* Retrans: not more than one window back */ 3937 (ackskew >= -MAXACKWINDOW) && 3938 /* Acking not more than one reassembled fragment backwards */ 3939 (ackskew <= (MAXACKWINDOW << sws)) && 3940 /* Acking not more than one window forward */ 3941 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 3942 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 3943 (pd->flags & PFDESC_IP_REAS) == 0)) { 3944 /* Require an exact/+1 sequence match on resets when possible */ 3945 3946 if (dst->scrub || src->scrub) { 3947 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 3948 *state, src, dst, copyback)) 3949 return (PF_DROP); 3950 } 3951 3952 /* update max window */ 3953 if (src->max_win < win) 3954 src->max_win = win; 3955 /* synchronize sequencing */ 3956 if (SEQ_GT(end, src->seqlo)) 3957 src->seqlo = end; 3958 /* slide the window of what the other end can send */ 3959 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3960 dst->seqhi = ack + MAX((win << sws), 1); 3961 3962 3963 /* update states */ 3964 if (th->th_flags & TH_SYN) 3965 if (src->state < TCPS_SYN_SENT) 3966 src->state = TCPS_SYN_SENT; 3967 if (th->th_flags & TH_FIN) 3968 if (src->state < TCPS_CLOSING) 3969 src->state = TCPS_CLOSING; 3970 if (th->th_flags & TH_ACK) { 3971 if (dst->state == TCPS_SYN_SENT) { 3972 dst->state = TCPS_ESTABLISHED; 3973 if (src->state == TCPS_ESTABLISHED && 3974 (*state)->src_node != NULL && 3975 pf_src_connlimit(state)) { 3976 REASON_SET(reason, PFRES_SRCLIMIT); 3977 return (PF_DROP); 3978 } 3979 } else if (dst->state == TCPS_CLOSING) 3980 dst->state = TCPS_FIN_WAIT_2; 3981 } 3982 if (th->th_flags & TH_RST) 3983 src->state = dst->state = TCPS_TIME_WAIT; 3984 3985 /* update expire time */ 3986 (*state)->expire = time_uptime; 3987 if (src->state >= TCPS_FIN_WAIT_2 && 3988 dst->state >= TCPS_FIN_WAIT_2) 3989 (*state)->timeout = PFTM_TCP_CLOSED; 3990 else if (src->state >= TCPS_CLOSING && 3991 dst->state >= TCPS_CLOSING) 3992 (*state)->timeout = PFTM_TCP_FIN_WAIT; 3993 else if (src->state < TCPS_ESTABLISHED || 3994 dst->state < TCPS_ESTABLISHED) 3995 (*state)->timeout = PFTM_TCP_OPENING; 3996 else if (src->state >= TCPS_CLOSING || 3997 dst->state >= TCPS_CLOSING) 3998 (*state)->timeout = PFTM_TCP_CLOSING; 3999 else 4000 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4001 4002 /* Fall through to PASS packet */ 4003 4004 } else if ((dst->state < TCPS_SYN_SENT || 4005 dst->state >= TCPS_FIN_WAIT_2 || 4006 src->state >= TCPS_FIN_WAIT_2) && 4007 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4008 /* Within a window forward of the originating packet */ 4009 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4010 /* Within a window backward of the originating packet */ 4011 4012 /* 4013 * This currently handles three situations: 4014 * 1) Stupid stacks will shotgun SYNs before their peer 4015 * replies. 4016 * 2) When PF catches an already established stream (the 4017 * firewall rebooted, the state table was flushed, routes 4018 * changed...) 4019 * 3) Packets get funky immediately after the connection 4020 * closes (this should catch Solaris spurious ACK|FINs 4021 * that web servers like to spew after a close) 4022 * 4023 * This must be a little more careful than the above code 4024 * since packet floods will also be caught here. We don't 4025 * update the TTL here to mitigate the damage of a packet 4026 * flood and so the same code can handle awkward establishment 4027 * and a loosened connection close. 4028 * In the establishment case, a correct peer response will 4029 * validate the connection, go through the normal state code 4030 * and keep updating the state TTL. 4031 */ 4032 4033 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4034 printf("pf: loose state match: "); 4035 pf_print_state(*state); 4036 pf_print_flags(th->th_flags); 4037 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4038 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4039 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4040 (unsigned long long)(*state)->packets[1], 4041 pd->dir == PF_IN ? "in" : "out", 4042 pd->dir == (*state)->direction ? "fwd" : "rev"); 4043 } 4044 4045 if (dst->scrub || src->scrub) { 4046 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4047 *state, src, dst, copyback)) 4048 return (PF_DROP); 4049 } 4050 4051 /* update max window */ 4052 if (src->max_win < win) 4053 src->max_win = win; 4054 /* synchronize sequencing */ 4055 if (SEQ_GT(end, src->seqlo)) 4056 src->seqlo = end; 4057 /* slide the window of what the other end can send */ 4058 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4059 dst->seqhi = ack + MAX((win << sws), 1); 4060 4061 /* 4062 * Cannot set dst->seqhi here since this could be a shotgunned 4063 * SYN and not an already established connection. 4064 */ 4065 4066 if (th->th_flags & TH_FIN) 4067 if (src->state < TCPS_CLOSING) 4068 src->state = TCPS_CLOSING; 4069 if (th->th_flags & TH_RST) 4070 src->state = dst->state = TCPS_TIME_WAIT; 4071 4072 /* Fall through to PASS packet */ 4073 4074 } else { 4075 if ((*state)->dst.state == TCPS_SYN_SENT && 4076 (*state)->src.state == TCPS_SYN_SENT) { 4077 /* Send RST for state mismatches during handshake */ 4078 if (!(th->th_flags & TH_RST)) 4079 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4080 pd->dst, pd->src, th->th_dport, 4081 th->th_sport, ntohl(th->th_ack), 0, 4082 TH_RST, 0, 0, 4083 (*state)->rule.ptr->return_ttl, 1, 0, 4084 kif->pfik_ifp); 4085 src->seqlo = 0; 4086 src->seqhi = 1; 4087 src->max_win = 1; 4088 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4089 printf("pf: BAD state: "); 4090 pf_print_state(*state); 4091 pf_print_flags(th->th_flags); 4092 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4093 "pkts=%llu:%llu dir=%s,%s\n", 4094 seq, orig_seq, ack, pd->p_len, ackskew, 4095 (unsigned long long)(*state)->packets[0], 4096 (unsigned long long)(*state)->packets[1], 4097 pd->dir == PF_IN ? "in" : "out", 4098 pd->dir == (*state)->direction ? "fwd" : "rev"); 4099 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4100 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4101 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4102 ' ': '2', 4103 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4104 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4105 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4106 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4107 } 4108 REASON_SET(reason, PFRES_BADSTATE); 4109 return (PF_DROP); 4110 } 4111 4112 return (PF_PASS); 4113} 4114 4115static int 4116pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4117 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4118{ 4119 struct tcphdr *th = pd->hdr.tcp; 4120 4121 if (th->th_flags & TH_SYN) 4122 if (src->state < TCPS_SYN_SENT) 4123 src->state = TCPS_SYN_SENT; 4124 if (th->th_flags & TH_FIN) 4125 if (src->state < TCPS_CLOSING) 4126 src->state = TCPS_CLOSING; 4127 if (th->th_flags & TH_ACK) { 4128 if (dst->state == TCPS_SYN_SENT) { 4129 dst->state = TCPS_ESTABLISHED; 4130 if (src->state == TCPS_ESTABLISHED && 4131 (*state)->src_node != NULL && 4132 pf_src_connlimit(state)) { 4133 REASON_SET(reason, PFRES_SRCLIMIT); 4134 return (PF_DROP); 4135 } 4136 } else if (dst->state == TCPS_CLOSING) { 4137 dst->state = TCPS_FIN_WAIT_2; 4138 } else if (src->state == TCPS_SYN_SENT && 4139 dst->state < TCPS_SYN_SENT) { 4140 /* 4141 * Handle a special sloppy case where we only see one 4142 * half of the connection. If there is a ACK after 4143 * the initial SYN without ever seeing a packet from 4144 * the destination, set the connection to established. 4145 */ 4146 dst->state = src->state = TCPS_ESTABLISHED; 4147 if ((*state)->src_node != NULL && 4148 pf_src_connlimit(state)) { 4149 REASON_SET(reason, PFRES_SRCLIMIT); 4150 return (PF_DROP); 4151 } 4152 } else if (src->state == TCPS_CLOSING && 4153 dst->state == TCPS_ESTABLISHED && 4154 dst->seqlo == 0) { 4155 /* 4156 * Handle the closing of half connections where we 4157 * don't see the full bidirectional FIN/ACK+ACK 4158 * handshake. 4159 */ 4160 dst->state = TCPS_CLOSING; 4161 } 4162 } 4163 if (th->th_flags & TH_RST) 4164 src->state = dst->state = TCPS_TIME_WAIT; 4165 4166 /* update expire time */ 4167 (*state)->expire = time_uptime; 4168 if (src->state >= TCPS_FIN_WAIT_2 && 4169 dst->state >= TCPS_FIN_WAIT_2) 4170 (*state)->timeout = PFTM_TCP_CLOSED; 4171 else if (src->state >= TCPS_CLOSING && 4172 dst->state >= TCPS_CLOSING) 4173 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4174 else if (src->state < TCPS_ESTABLISHED || 4175 dst->state < TCPS_ESTABLISHED) 4176 (*state)->timeout = PFTM_TCP_OPENING; 4177 else if (src->state >= TCPS_CLOSING || 4178 dst->state >= TCPS_CLOSING) 4179 (*state)->timeout = PFTM_TCP_CLOSING; 4180 else 4181 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4182 4183 return (PF_PASS); 4184} 4185 4186static int 4187pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4188 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4189 u_short *reason) 4190{ 4191 struct pf_state_key_cmp key; 4192 struct tcphdr *th = pd->hdr.tcp; 4193 int copyback = 0; 4194 struct pf_state_peer *src, *dst; 4195 struct pf_state_key *sk; 4196 4197 bzero(&key, sizeof(key)); 4198 key.af = pd->af; 4199 key.proto = IPPROTO_TCP; 4200 if (direction == PF_IN) { /* wire side, straight */ 4201 PF_ACPY(&key.addr[0], pd->src, key.af); 4202 PF_ACPY(&key.addr[1], pd->dst, key.af); 4203 key.port[0] = th->th_sport; 4204 key.port[1] = th->th_dport; 4205 } else { /* stack side, reverse */ 4206 PF_ACPY(&key.addr[1], pd->src, key.af); 4207 PF_ACPY(&key.addr[0], pd->dst, key.af); 4208 key.port[1] = th->th_sport; 4209 key.port[0] = th->th_dport; 4210 } 4211 4212 STATE_LOOKUP(kif, &key, direction, *state, pd); 4213 4214 if (direction == (*state)->direction) { 4215 src = &(*state)->src; 4216 dst = &(*state)->dst; 4217 } else { 4218 src = &(*state)->dst; 4219 dst = &(*state)->src; 4220 } 4221 4222 sk = (*state)->key[pd->didx]; 4223 4224 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4225 if (direction != (*state)->direction) { 4226 REASON_SET(reason, PFRES_SYNPROXY); 4227 return (PF_SYNPROXY_DROP); 4228 } 4229 if (th->th_flags & TH_SYN) { 4230 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4231 REASON_SET(reason, PFRES_SYNPROXY); 4232 return (PF_DROP); 4233 } 4234 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4235 pd->src, th->th_dport, th->th_sport, 4236 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4237 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4238 REASON_SET(reason, PFRES_SYNPROXY); 4239 return (PF_SYNPROXY_DROP); 4240 } else if (!(th->th_flags & TH_ACK) || 4241 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4242 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4243 REASON_SET(reason, PFRES_SYNPROXY); 4244 return (PF_DROP); 4245 } else if ((*state)->src_node != NULL && 4246 pf_src_connlimit(state)) { 4247 REASON_SET(reason, PFRES_SRCLIMIT); 4248 return (PF_DROP); 4249 } else 4250 (*state)->src.state = PF_TCPS_PROXY_DST; 4251 } 4252 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4253 if (direction == (*state)->direction) { 4254 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4255 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4256 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4257 REASON_SET(reason, PFRES_SYNPROXY); 4258 return (PF_DROP); 4259 } 4260 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4261 if ((*state)->dst.seqhi == 1) 4262 (*state)->dst.seqhi = htonl(arc4random()); 4263 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4264 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4265 sk->port[pd->sidx], sk->port[pd->didx], 4266 (*state)->dst.seqhi, 0, TH_SYN, 0, 4267 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4268 REASON_SET(reason, PFRES_SYNPROXY); 4269 return (PF_SYNPROXY_DROP); 4270 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4271 (TH_SYN|TH_ACK)) || 4272 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4273 REASON_SET(reason, PFRES_SYNPROXY); 4274 return (PF_DROP); 4275 } else { 4276 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4277 (*state)->dst.seqlo = ntohl(th->th_seq); 4278 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4279 pd->src, th->th_dport, th->th_sport, 4280 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4281 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4282 (*state)->tag, NULL); 4283 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4284 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4285 sk->port[pd->sidx], sk->port[pd->didx], 4286 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4287 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4288 (*state)->src.seqdiff = (*state)->dst.seqhi - 4289 (*state)->src.seqlo; 4290 (*state)->dst.seqdiff = (*state)->src.seqhi - 4291 (*state)->dst.seqlo; 4292 (*state)->src.seqhi = (*state)->src.seqlo + 4293 (*state)->dst.max_win; 4294 (*state)->dst.seqhi = (*state)->dst.seqlo + 4295 (*state)->src.max_win; 4296 (*state)->src.wscale = (*state)->dst.wscale = 0; 4297 (*state)->src.state = (*state)->dst.state = 4298 TCPS_ESTABLISHED; 4299 REASON_SET(reason, PFRES_SYNPROXY); 4300 return (PF_SYNPROXY_DROP); 4301 } 4302 } 4303 4304 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4305 dst->state >= TCPS_FIN_WAIT_2 && 4306 src->state >= TCPS_FIN_WAIT_2) { 4307 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4308 printf("pf: state reuse "); 4309 pf_print_state(*state); 4310 pf_print_flags(th->th_flags); 4311 printf("\n"); 4312 } 4313 /* XXX make sure it's the same direction ?? */ 4314 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4315 pf_unlink_state(*state, PF_ENTER_LOCKED); 4316 *state = NULL; 4317 return (PF_DROP); 4318 } 4319 4320 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4321 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4322 return (PF_DROP); 4323 } else { 4324 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4325 ©back) == PF_DROP) 4326 return (PF_DROP); 4327 } 4328 4329 /* translate source/destination address, if necessary */ 4330 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4331 struct pf_state_key *nk = (*state)->key[pd->didx]; 4332 4333 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4334 nk->port[pd->sidx] != th->th_sport) 4335 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4336 &th->th_sum, &nk->addr[pd->sidx], 4337 nk->port[pd->sidx], 0, pd->af); 4338 4339 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4340 nk->port[pd->didx] != th->th_dport) 4341 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4342 &th->th_sum, &nk->addr[pd->didx], 4343 nk->port[pd->didx], 0, pd->af); 4344 copyback = 1; 4345 } 4346 4347 /* Copyback sequence modulation or stateful scrub changes if needed */ 4348 if (copyback) 4349 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4350 4351 return (PF_PASS); 4352} 4353 4354static int 4355pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4356 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4357{ 4358 struct pf_state_peer *src, *dst; 4359 struct pf_state_key_cmp key; 4360 struct udphdr *uh = pd->hdr.udp; 4361 4362 bzero(&key, sizeof(key)); 4363 key.af = pd->af; 4364 key.proto = IPPROTO_UDP; 4365 if (direction == PF_IN) { /* wire side, straight */ 4366 PF_ACPY(&key.addr[0], pd->src, key.af); 4367 PF_ACPY(&key.addr[1], pd->dst, key.af); 4368 key.port[0] = uh->uh_sport; 4369 key.port[1] = uh->uh_dport; 4370 } else { /* stack side, reverse */ 4371 PF_ACPY(&key.addr[1], pd->src, key.af); 4372 PF_ACPY(&key.addr[0], pd->dst, key.af); 4373 key.port[1] = uh->uh_sport; 4374 key.port[0] = uh->uh_dport; 4375 } 4376 4377 STATE_LOOKUP(kif, &key, direction, *state, pd); 4378 4379 if (direction == (*state)->direction) { 4380 src = &(*state)->src; 4381 dst = &(*state)->dst; 4382 } else { 4383 src = &(*state)->dst; 4384 dst = &(*state)->src; 4385 } 4386 4387 /* update states */ 4388 if (src->state < PFUDPS_SINGLE) 4389 src->state = PFUDPS_SINGLE; 4390 if (dst->state == PFUDPS_SINGLE) 4391 dst->state = PFUDPS_MULTIPLE; 4392 4393 /* update expire time */ 4394 (*state)->expire = time_uptime; 4395 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4396 (*state)->timeout = PFTM_UDP_MULTIPLE; 4397 else 4398 (*state)->timeout = PFTM_UDP_SINGLE; 4399 4400 /* translate source/destination address, if necessary */ 4401 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4402 struct pf_state_key *nk = (*state)->key[pd->didx]; 4403 4404 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4405 nk->port[pd->sidx] != uh->uh_sport) 4406 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4407 &uh->uh_sum, &nk->addr[pd->sidx], 4408 nk->port[pd->sidx], 1, pd->af); 4409 4410 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4411 nk->port[pd->didx] != uh->uh_dport) 4412 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4413 &uh->uh_sum, &nk->addr[pd->didx], 4414 nk->port[pd->didx], 1, pd->af); 4415 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4416 } 4417 4418 return (PF_PASS); 4419} 4420 4421static int 4422pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4423 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4424{ 4425 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4426 u_int16_t icmpid = 0, *icmpsum; 4427 u_int8_t icmptype; 4428 int state_icmp = 0; 4429 struct pf_state_key_cmp key; 4430 4431 bzero(&key, sizeof(key)); 4432 switch (pd->proto) { 4433#ifdef INET 4434 case IPPROTO_ICMP: 4435 icmptype = pd->hdr.icmp->icmp_type; 4436 icmpid = pd->hdr.icmp->icmp_id; 4437 icmpsum = &pd->hdr.icmp->icmp_cksum; 4438 4439 if (icmptype == ICMP_UNREACH || 4440 icmptype == ICMP_SOURCEQUENCH || 4441 icmptype == ICMP_REDIRECT || 4442 icmptype == ICMP_TIMXCEED || 4443 icmptype == ICMP_PARAMPROB) 4444 state_icmp++; 4445 break; 4446#endif /* INET */ 4447#ifdef INET6 4448 case IPPROTO_ICMPV6: 4449 icmptype = pd->hdr.icmp6->icmp6_type; 4450 icmpid = pd->hdr.icmp6->icmp6_id; 4451 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4452 4453 if (icmptype == ICMP6_DST_UNREACH || 4454 icmptype == ICMP6_PACKET_TOO_BIG || 4455 icmptype == ICMP6_TIME_EXCEEDED || 4456 icmptype == ICMP6_PARAM_PROB) 4457 state_icmp++; 4458 break; 4459#endif /* INET6 */ 4460 } 4461 4462 if (!state_icmp) { 4463 4464 /* 4465 * ICMP query/reply message not related to a TCP/UDP packet. 4466 * Search for an ICMP state. 4467 */ 4468 key.af = pd->af; 4469 key.proto = pd->proto; 4470 key.port[0] = key.port[1] = icmpid; 4471 if (direction == PF_IN) { /* wire side, straight */ 4472 PF_ACPY(&key.addr[0], pd->src, key.af); 4473 PF_ACPY(&key.addr[1], pd->dst, key.af); 4474 } else { /* stack side, reverse */ 4475 PF_ACPY(&key.addr[1], pd->src, key.af); 4476 PF_ACPY(&key.addr[0], pd->dst, key.af); 4477 } 4478 4479 STATE_LOOKUP(kif, &key, direction, *state, pd); 4480 4481 (*state)->expire = time_uptime; 4482 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4483 4484 /* translate source/destination address, if necessary */ 4485 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4486 struct pf_state_key *nk = (*state)->key[pd->didx]; 4487 4488 switch (pd->af) { 4489#ifdef INET 4490 case AF_INET: 4491 if (PF_ANEQ(pd->src, 4492 &nk->addr[pd->sidx], AF_INET)) 4493 pf_change_a(&saddr->v4.s_addr, 4494 pd->ip_sum, 4495 nk->addr[pd->sidx].v4.s_addr, 0); 4496 4497 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4498 AF_INET)) 4499 pf_change_a(&daddr->v4.s_addr, 4500 pd->ip_sum, 4501 nk->addr[pd->didx].v4.s_addr, 0); 4502 4503 if (nk->port[0] != 4504 pd->hdr.icmp->icmp_id) { 4505 pd->hdr.icmp->icmp_cksum = 4506 pf_cksum_fixup( 4507 pd->hdr.icmp->icmp_cksum, icmpid, 4508 nk->port[pd->sidx], 0); 4509 pd->hdr.icmp->icmp_id = 4510 nk->port[pd->sidx]; 4511 } 4512 4513 m_copyback(m, off, ICMP_MINLEN, 4514 (caddr_t )pd->hdr.icmp); 4515 break; 4516#endif /* INET */ 4517#ifdef INET6 4518 case AF_INET6: 4519 if (PF_ANEQ(pd->src, 4520 &nk->addr[pd->sidx], AF_INET6)) 4521 pf_change_a6(saddr, 4522 &pd->hdr.icmp6->icmp6_cksum, 4523 &nk->addr[pd->sidx], 0); 4524 4525 if (PF_ANEQ(pd->dst, 4526 &nk->addr[pd->didx], AF_INET6)) 4527 pf_change_a6(daddr, 4528 &pd->hdr.icmp6->icmp6_cksum, 4529 &nk->addr[pd->didx], 0); 4530 4531 m_copyback(m, off, sizeof(struct icmp6_hdr), 4532 (caddr_t )pd->hdr.icmp6); 4533 break; 4534#endif /* INET6 */ 4535 } 4536 } 4537 return (PF_PASS); 4538 4539 } else { 4540 /* 4541 * ICMP error message in response to a TCP/UDP packet. 4542 * Extract the inner TCP/UDP header and search for that state. 4543 */ 4544 4545 struct pf_pdesc pd2; 4546 bzero(&pd2, sizeof pd2); 4547#ifdef INET 4548 struct ip h2; 4549#endif /* INET */ 4550#ifdef INET6 4551 struct ip6_hdr h2_6; 4552 int terminal = 0; 4553#endif /* INET6 */ 4554 int ipoff2 = 0; 4555 int off2 = 0; 4556 4557 pd2.af = pd->af; 4558 /* Payload packet is from the opposite direction. */ 4559 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4560 pd2.didx = (direction == PF_IN) ? 0 : 1; 4561 switch (pd->af) { 4562#ifdef INET 4563 case AF_INET: 4564 /* offset of h2 in mbuf chain */ 4565 ipoff2 = off + ICMP_MINLEN; 4566 4567 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4568 NULL, reason, pd2.af)) { 4569 DPFPRINTF(PF_DEBUG_MISC, 4570 ("pf: ICMP error message too short " 4571 "(ip)\n")); 4572 return (PF_DROP); 4573 } 4574 /* 4575 * ICMP error messages don't refer to non-first 4576 * fragments 4577 */ 4578 if (h2.ip_off & htons(IP_OFFMASK)) { 4579 REASON_SET(reason, PFRES_FRAG); 4580 return (PF_DROP); 4581 } 4582 4583 /* offset of protocol header that follows h2 */ 4584 off2 = ipoff2 + (h2.ip_hl << 2); 4585 4586 pd2.proto = h2.ip_p; 4587 pd2.src = (struct pf_addr *)&h2.ip_src; 4588 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4589 pd2.ip_sum = &h2.ip_sum; 4590 break; 4591#endif /* INET */ 4592#ifdef INET6 4593 case AF_INET6: 4594 ipoff2 = off + sizeof(struct icmp6_hdr); 4595 4596 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4597 NULL, reason, pd2.af)) { 4598 DPFPRINTF(PF_DEBUG_MISC, 4599 ("pf: ICMP error message too short " 4600 "(ip6)\n")); 4601 return (PF_DROP); 4602 } 4603 pd2.proto = h2_6.ip6_nxt; 4604 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4605 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4606 pd2.ip_sum = NULL; 4607 off2 = ipoff2 + sizeof(h2_6); 4608 do { 4609 switch (pd2.proto) { 4610 case IPPROTO_FRAGMENT: 4611 /* 4612 * ICMPv6 error messages for 4613 * non-first fragments 4614 */ 4615 REASON_SET(reason, PFRES_FRAG); 4616 return (PF_DROP); 4617 case IPPROTO_AH: 4618 case IPPROTO_HOPOPTS: 4619 case IPPROTO_ROUTING: 4620 case IPPROTO_DSTOPTS: { 4621 /* get next header and header length */ 4622 struct ip6_ext opt6; 4623 4624 if (!pf_pull_hdr(m, off2, &opt6, 4625 sizeof(opt6), NULL, reason, 4626 pd2.af)) { 4627 DPFPRINTF(PF_DEBUG_MISC, 4628 ("pf: ICMPv6 short opt\n")); 4629 return (PF_DROP); 4630 } 4631 if (pd2.proto == IPPROTO_AH) 4632 off2 += (opt6.ip6e_len + 2) * 4; 4633 else 4634 off2 += (opt6.ip6e_len + 1) * 8; 4635 pd2.proto = opt6.ip6e_nxt; 4636 /* goto the next header */ 4637 break; 4638 } 4639 default: 4640 terminal++; 4641 break; 4642 } 4643 } while (!terminal); 4644 break; 4645#endif /* INET6 */ 4646 } 4647 4648 switch (pd2.proto) { 4649 case IPPROTO_TCP: { 4650 struct tcphdr th; 4651 u_int32_t seq; 4652 struct pf_state_peer *src, *dst; 4653 u_int8_t dws; 4654 int copyback = 0; 4655 4656 /* 4657 * Only the first 8 bytes of the TCP header can be 4658 * expected. Don't access any TCP header fields after 4659 * th_seq, an ackskew test is not possible. 4660 */ 4661 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4662 pd2.af)) { 4663 DPFPRINTF(PF_DEBUG_MISC, 4664 ("pf: ICMP error message too short " 4665 "(tcp)\n")); 4666 return (PF_DROP); 4667 } 4668 4669 key.af = pd2.af; 4670 key.proto = IPPROTO_TCP; 4671 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4672 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4673 key.port[pd2.sidx] = th.th_sport; 4674 key.port[pd2.didx] = th.th_dport; 4675 4676 STATE_LOOKUP(kif, &key, direction, *state, pd); 4677 4678 if (direction == (*state)->direction) { 4679 src = &(*state)->dst; 4680 dst = &(*state)->src; 4681 } else { 4682 src = &(*state)->src; 4683 dst = &(*state)->dst; 4684 } 4685 4686 if (src->wscale && dst->wscale) 4687 dws = dst->wscale & PF_WSCALE_MASK; 4688 else 4689 dws = 0; 4690 4691 /* Demodulate sequence number */ 4692 seq = ntohl(th.th_seq) - src->seqdiff; 4693 if (src->seqdiff) { 4694 pf_change_a(&th.th_seq, icmpsum, 4695 htonl(seq), 0); 4696 copyback = 1; 4697 } 4698 4699 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4700 (!SEQ_GEQ(src->seqhi, seq) || 4701 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4702 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4703 printf("pf: BAD ICMP %d:%d ", 4704 icmptype, pd->hdr.icmp->icmp_code); 4705 pf_print_host(pd->src, 0, pd->af); 4706 printf(" -> "); 4707 pf_print_host(pd->dst, 0, pd->af); 4708 printf(" state: "); 4709 pf_print_state(*state); 4710 printf(" seq=%u\n", seq); 4711 } 4712 REASON_SET(reason, PFRES_BADSTATE); 4713 return (PF_DROP); 4714 } else { 4715 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4716 printf("pf: OK ICMP %d:%d ", 4717 icmptype, pd->hdr.icmp->icmp_code); 4718 pf_print_host(pd->src, 0, pd->af); 4719 printf(" -> "); 4720 pf_print_host(pd->dst, 0, pd->af); 4721 printf(" state: "); 4722 pf_print_state(*state); 4723 printf(" seq=%u\n", seq); 4724 } 4725 } 4726 4727 /* translate source/destination address, if necessary */ 4728 if ((*state)->key[PF_SK_WIRE] != 4729 (*state)->key[PF_SK_STACK]) { 4730 struct pf_state_key *nk = 4731 (*state)->key[pd->didx]; 4732 4733 if (PF_ANEQ(pd2.src, 4734 &nk->addr[pd2.sidx], pd2.af) || 4735 nk->port[pd2.sidx] != th.th_sport) 4736 pf_change_icmp(pd2.src, &th.th_sport, 4737 daddr, &nk->addr[pd2.sidx], 4738 nk->port[pd2.sidx], NULL, 4739 pd2.ip_sum, icmpsum, 4740 pd->ip_sum, 0, pd2.af); 4741 4742 if (PF_ANEQ(pd2.dst, 4743 &nk->addr[pd2.didx], pd2.af) || 4744 nk->port[pd2.didx] != th.th_dport) 4745 pf_change_icmp(pd2.dst, &th.th_dport, 4746 NULL, /* XXX Inbound NAT? */ 4747 &nk->addr[pd2.didx], 4748 nk->port[pd2.didx], NULL, 4749 pd2.ip_sum, icmpsum, 4750 pd->ip_sum, 0, pd2.af); 4751 copyback = 1; 4752 } 4753 4754 if (copyback) { 4755 switch (pd2.af) { 4756#ifdef INET 4757 case AF_INET: 4758 m_copyback(m, off, ICMP_MINLEN, 4759 (caddr_t )pd->hdr.icmp); 4760 m_copyback(m, ipoff2, sizeof(h2), 4761 (caddr_t )&h2); 4762 break; 4763#endif /* INET */ 4764#ifdef INET6 4765 case AF_INET6: 4766 m_copyback(m, off, 4767 sizeof(struct icmp6_hdr), 4768 (caddr_t )pd->hdr.icmp6); 4769 m_copyback(m, ipoff2, sizeof(h2_6), 4770 (caddr_t )&h2_6); 4771 break; 4772#endif /* INET6 */ 4773 } 4774 m_copyback(m, off2, 8, (caddr_t)&th); 4775 } 4776 4777 return (PF_PASS); 4778 break; 4779 } 4780 case IPPROTO_UDP: { 4781 struct udphdr uh; 4782 4783 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4784 NULL, reason, pd2.af)) { 4785 DPFPRINTF(PF_DEBUG_MISC, 4786 ("pf: ICMP error message too short " 4787 "(udp)\n")); 4788 return (PF_DROP); 4789 } 4790 4791 key.af = pd2.af; 4792 key.proto = IPPROTO_UDP; 4793 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4794 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4795 key.port[pd2.sidx] = uh.uh_sport; 4796 key.port[pd2.didx] = uh.uh_dport; 4797 4798 STATE_LOOKUP(kif, &key, direction, *state, pd); 4799 4800 /* translate source/destination address, if necessary */ 4801 if ((*state)->key[PF_SK_WIRE] != 4802 (*state)->key[PF_SK_STACK]) { 4803 struct pf_state_key *nk = 4804 (*state)->key[pd->didx]; 4805 4806 if (PF_ANEQ(pd2.src, 4807 &nk->addr[pd2.sidx], pd2.af) || 4808 nk->port[pd2.sidx] != uh.uh_sport) 4809 pf_change_icmp(pd2.src, &uh.uh_sport, 4810 daddr, &nk->addr[pd2.sidx], 4811 nk->port[pd2.sidx], &uh.uh_sum, 4812 pd2.ip_sum, icmpsum, 4813 pd->ip_sum, 1, pd2.af); 4814 4815 if (PF_ANEQ(pd2.dst, 4816 &nk->addr[pd2.didx], pd2.af) || 4817 nk->port[pd2.didx] != uh.uh_dport) 4818 pf_change_icmp(pd2.dst, &uh.uh_dport, 4819 NULL, /* XXX Inbound NAT? */ 4820 &nk->addr[pd2.didx], 4821 nk->port[pd2.didx], &uh.uh_sum, 4822 pd2.ip_sum, icmpsum, 4823 pd->ip_sum, 1, pd2.af); 4824 4825 switch (pd2.af) { 4826#ifdef INET 4827 case AF_INET: 4828 m_copyback(m, off, ICMP_MINLEN, 4829 (caddr_t )pd->hdr.icmp); 4830 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4831 break; 4832#endif /* INET */ 4833#ifdef INET6 4834 case AF_INET6: 4835 m_copyback(m, off, 4836 sizeof(struct icmp6_hdr), 4837 (caddr_t )pd->hdr.icmp6); 4838 m_copyback(m, ipoff2, sizeof(h2_6), 4839 (caddr_t )&h2_6); 4840 break; 4841#endif /* INET6 */ 4842 } 4843 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4844 } 4845 return (PF_PASS); 4846 break; 4847 } 4848#ifdef INET 4849 case IPPROTO_ICMP: { 4850 struct icmp iih; 4851 4852 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4853 NULL, reason, pd2.af)) { 4854 DPFPRINTF(PF_DEBUG_MISC, 4855 ("pf: ICMP error message too short i" 4856 "(icmp)\n")); 4857 return (PF_DROP); 4858 } 4859 4860 key.af = pd2.af; 4861 key.proto = IPPROTO_ICMP; 4862 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4863 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4864 key.port[0] = key.port[1] = iih.icmp_id; 4865 4866 STATE_LOOKUP(kif, &key, direction, *state, pd); 4867 4868 /* translate source/destination address, if necessary */ 4869 if ((*state)->key[PF_SK_WIRE] != 4870 (*state)->key[PF_SK_STACK]) { 4871 struct pf_state_key *nk = 4872 (*state)->key[pd->didx]; 4873 4874 if (PF_ANEQ(pd2.src, 4875 &nk->addr[pd2.sidx], pd2.af) || 4876 nk->port[pd2.sidx] != iih.icmp_id) 4877 pf_change_icmp(pd2.src, &iih.icmp_id, 4878 daddr, &nk->addr[pd2.sidx], 4879 nk->port[pd2.sidx], NULL, 4880 pd2.ip_sum, icmpsum, 4881 pd->ip_sum, 0, AF_INET); 4882 4883 if (PF_ANEQ(pd2.dst, 4884 &nk->addr[pd2.didx], pd2.af) || 4885 nk->port[pd2.didx] != iih.icmp_id) 4886 pf_change_icmp(pd2.dst, &iih.icmp_id, 4887 NULL, /* XXX Inbound NAT? */ 4888 &nk->addr[pd2.didx], 4889 nk->port[pd2.didx], NULL, 4890 pd2.ip_sum, icmpsum, 4891 pd->ip_sum, 0, AF_INET); 4892 4893 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4894 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4895 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4896 } 4897 return (PF_PASS); 4898 break; 4899 } 4900#endif /* INET */ 4901#ifdef INET6 4902 case IPPROTO_ICMPV6: { 4903 struct icmp6_hdr iih; 4904 4905 if (!pf_pull_hdr(m, off2, &iih, 4906 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4907 DPFPRINTF(PF_DEBUG_MISC, 4908 ("pf: ICMP error message too short " 4909 "(icmp6)\n")); 4910 return (PF_DROP); 4911 } 4912 4913 key.af = pd2.af; 4914 key.proto = IPPROTO_ICMPV6; 4915 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4916 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4917 key.port[0] = key.port[1] = iih.icmp6_id; 4918 4919 STATE_LOOKUP(kif, &key, direction, *state, pd); 4920 4921 /* translate source/destination address, if necessary */ 4922 if ((*state)->key[PF_SK_WIRE] != 4923 (*state)->key[PF_SK_STACK]) { 4924 struct pf_state_key *nk = 4925 (*state)->key[pd->didx]; 4926 4927 if (PF_ANEQ(pd2.src, 4928 &nk->addr[pd2.sidx], pd2.af) || 4929 nk->port[pd2.sidx] != iih.icmp6_id) 4930 pf_change_icmp(pd2.src, &iih.icmp6_id, 4931 daddr, &nk->addr[pd2.sidx], 4932 nk->port[pd2.sidx], NULL, 4933 pd2.ip_sum, icmpsum, 4934 pd->ip_sum, 0, AF_INET6); 4935 4936 if (PF_ANEQ(pd2.dst, 4937 &nk->addr[pd2.didx], pd2.af) || 4938 nk->port[pd2.didx] != iih.icmp6_id) 4939 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4940 NULL, /* XXX Inbound NAT? */ 4941 &nk->addr[pd2.didx], 4942 nk->port[pd2.didx], NULL, 4943 pd2.ip_sum, icmpsum, 4944 pd->ip_sum, 0, AF_INET6); 4945 4946 m_copyback(m, off, sizeof(struct icmp6_hdr), 4947 (caddr_t)pd->hdr.icmp6); 4948 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4949 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4950 (caddr_t)&iih); 4951 } 4952 return (PF_PASS); 4953 break; 4954 } 4955#endif /* INET6 */ 4956 default: { 4957 key.af = pd2.af; 4958 key.proto = pd2.proto; 4959 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4960 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4961 key.port[0] = key.port[1] = 0; 4962 4963 STATE_LOOKUP(kif, &key, direction, *state, pd); 4964 4965 /* translate source/destination address, if necessary */ 4966 if ((*state)->key[PF_SK_WIRE] != 4967 (*state)->key[PF_SK_STACK]) { 4968 struct pf_state_key *nk = 4969 (*state)->key[pd->didx]; 4970 4971 if (PF_ANEQ(pd2.src, 4972 &nk->addr[pd2.sidx], pd2.af)) 4973 pf_change_icmp(pd2.src, NULL, daddr, 4974 &nk->addr[pd2.sidx], 0, NULL, 4975 pd2.ip_sum, icmpsum, 4976 pd->ip_sum, 0, pd2.af); 4977 4978 if (PF_ANEQ(pd2.dst, 4979 &nk->addr[pd2.didx], pd2.af)) 4980 pf_change_icmp(pd2.src, NULL, 4981 NULL, /* XXX Inbound NAT? */ 4982 &nk->addr[pd2.didx], 0, NULL, 4983 pd2.ip_sum, icmpsum, 4984 pd->ip_sum, 0, pd2.af); 4985 4986 switch (pd2.af) { 4987#ifdef INET 4988 case AF_INET: 4989 m_copyback(m, off, ICMP_MINLEN, 4990 (caddr_t)pd->hdr.icmp); 4991 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4992 break; 4993#endif /* INET */ 4994#ifdef INET6 4995 case AF_INET6: 4996 m_copyback(m, off, 4997 sizeof(struct icmp6_hdr), 4998 (caddr_t )pd->hdr.icmp6); 4999 m_copyback(m, ipoff2, sizeof(h2_6), 5000 (caddr_t )&h2_6); 5001 break; 5002#endif /* INET6 */ 5003 } 5004 } 5005 return (PF_PASS); 5006 break; 5007 } 5008 } 5009 } 5010} 5011 5012static int 5013pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5014 struct mbuf *m, struct pf_pdesc *pd) 5015{ 5016 struct pf_state_peer *src, *dst; 5017 struct pf_state_key_cmp key; 5018 5019 bzero(&key, sizeof(key)); 5020 key.af = pd->af; 5021 key.proto = pd->proto; 5022 if (direction == PF_IN) { 5023 PF_ACPY(&key.addr[0], pd->src, key.af); 5024 PF_ACPY(&key.addr[1], pd->dst, key.af); 5025 key.port[0] = key.port[1] = 0; 5026 } else { 5027 PF_ACPY(&key.addr[1], pd->src, key.af); 5028 PF_ACPY(&key.addr[0], pd->dst, key.af); 5029 key.port[1] = key.port[0] = 0; 5030 } 5031 5032 STATE_LOOKUP(kif, &key, direction, *state, pd); 5033 5034 if (direction == (*state)->direction) { 5035 src = &(*state)->src; 5036 dst = &(*state)->dst; 5037 } else { 5038 src = &(*state)->dst; 5039 dst = &(*state)->src; 5040 } 5041 5042 /* update states */ 5043 if (src->state < PFOTHERS_SINGLE) 5044 src->state = PFOTHERS_SINGLE; 5045 if (dst->state == PFOTHERS_SINGLE) 5046 dst->state = PFOTHERS_MULTIPLE; 5047 5048 /* update expire time */ 5049 (*state)->expire = time_uptime; 5050 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5051 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5052 else 5053 (*state)->timeout = PFTM_OTHER_SINGLE; 5054 5055 /* translate source/destination address, if necessary */ 5056 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5057 struct pf_state_key *nk = (*state)->key[pd->didx]; 5058 5059 KASSERT(nk, ("%s: nk is null", __func__)); 5060 KASSERT(pd, ("%s: pd is null", __func__)); 5061 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5062 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5063 switch (pd->af) { 5064#ifdef INET 5065 case AF_INET: 5066 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5067 pf_change_a(&pd->src->v4.s_addr, 5068 pd->ip_sum, 5069 nk->addr[pd->sidx].v4.s_addr, 5070 0); 5071 5072 5073 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5074 pf_change_a(&pd->dst->v4.s_addr, 5075 pd->ip_sum, 5076 nk->addr[pd->didx].v4.s_addr, 5077 0); 5078 5079 break; 5080#endif /* INET */ 5081#ifdef INET6 5082 case AF_INET6: 5083 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5084 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5085 5086 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5087 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5088#endif /* INET6 */ 5089 } 5090 } 5091 return (PF_PASS); 5092} 5093 5094/* 5095 * ipoff and off are measured from the start of the mbuf chain. 5096 * h must be at "ipoff" on the mbuf chain. 5097 */ 5098void * 5099pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5100 u_short *actionp, u_short *reasonp, sa_family_t af) 5101{ 5102 switch (af) { 5103#ifdef INET 5104 case AF_INET: { 5105 struct ip *h = mtod(m, struct ip *); 5106 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5107 5108 if (fragoff) { 5109 if (fragoff >= len) 5110 ACTION_SET(actionp, PF_PASS); 5111 else { 5112 ACTION_SET(actionp, PF_DROP); 5113 REASON_SET(reasonp, PFRES_FRAG); 5114 } 5115 return (NULL); 5116 } 5117 if (m->m_pkthdr.len < off + len || 5118 ntohs(h->ip_len) < off + len) { 5119 ACTION_SET(actionp, PF_DROP); 5120 REASON_SET(reasonp, PFRES_SHORT); 5121 return (NULL); 5122 } 5123 break; 5124 } 5125#endif /* INET */ 5126#ifdef INET6 5127 case AF_INET6: { 5128 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5129 5130 if (m->m_pkthdr.len < off + len || 5131 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5132 (unsigned)(off + len)) { 5133 ACTION_SET(actionp, PF_DROP); 5134 REASON_SET(reasonp, PFRES_SHORT); 5135 return (NULL); 5136 } 5137 break; 5138 } 5139#endif /* INET6 */ 5140 } 5141 m_copydata(m, off, len, p); 5142 return (p); 5143} 5144 5145int 5146pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5147 int rtableid) 5148{ 5149#ifdef RADIX_MPATH 5150 struct radix_node_head *rnh; 5151#endif 5152 struct sockaddr_in *dst; 5153 int ret = 1; 5154 int check_mpath; 5155#ifdef INET6 5156 struct sockaddr_in6 *dst6; 5157 struct route_in6 ro; 5158#else 5159 struct route ro; 5160#endif 5161 struct radix_node *rn; 5162 struct rtentry *rt; 5163 struct ifnet *ifp; 5164 5165 check_mpath = 0; 5166#ifdef RADIX_MPATH 5167 /* XXX: stick to table 0 for now */ 5168 rnh = rt_tables_get_rnh(0, af); 5169 if (rnh != NULL && rn_mpath_capable(rnh)) 5170 check_mpath = 1; 5171#endif 5172 bzero(&ro, sizeof(ro)); 5173 switch (af) { 5174 case AF_INET: 5175 dst = satosin(&ro.ro_dst); 5176 dst->sin_family = AF_INET; 5177 dst->sin_len = sizeof(*dst); 5178 dst->sin_addr = addr->v4; 5179 break; 5180#ifdef INET6 5181 case AF_INET6: 5182 /* 5183 * Skip check for addresses with embedded interface scope, 5184 * as they would always match anyway. 5185 */ 5186 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5187 goto out; 5188 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5189 dst6->sin6_family = AF_INET6; 5190 dst6->sin6_len = sizeof(*dst6); 5191 dst6->sin6_addr = addr->v6; 5192 break; 5193#endif /* INET6 */ 5194 default: 5195 return (0); 5196 } 5197 5198 /* Skip checks for ipsec interfaces */ 5199 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5200 goto out; 5201 5202 switch (af) { 5203#ifdef INET6 5204 case AF_INET6: 5205 in6_rtalloc_ign(&ro, 0, rtableid); 5206 break; 5207#endif 5208#ifdef INET 5209 case AF_INET: 5210 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5211 break; 5212#endif 5213 default: 5214 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5215 break; 5216 } 5217 5218 if (ro.ro_rt != NULL) { 5219 /* No interface given, this is a no-route check */ 5220 if (kif == NULL) 5221 goto out; 5222 5223 if (kif->pfik_ifp == NULL) { 5224 ret = 0; 5225 goto out; 5226 } 5227 5228 /* Perform uRPF check if passed input interface */ 5229 ret = 0; 5230 rn = (struct radix_node *)ro.ro_rt; 5231 do { 5232 rt = (struct rtentry *)rn; 5233 ifp = rt->rt_ifp; 5234 5235 if (kif->pfik_ifp == ifp) 5236 ret = 1; 5237#ifdef RADIX_MPATH 5238 rn = rn_mpath_next(rn); 5239#endif 5240 } while (check_mpath == 1 && rn != NULL && ret == 0); 5241 } else 5242 ret = 0; 5243out: 5244 if (ro.ro_rt != NULL) 5245 RTFREE(ro.ro_rt); 5246 return (ret); 5247} 5248 5249#ifdef INET 5250static void 5251pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5252 struct pf_state *s, struct pf_pdesc *pd) 5253{ 5254 struct mbuf *m0, *m1; 5255 struct sockaddr_in dst; 5256 struct ip *ip; 5257 struct ifnet *ifp = NULL; 5258 struct pf_addr naddr; 5259 struct pf_src_node *sn = NULL; 5260 int error = 0; 5261 uint16_t ip_len, ip_off; 5262 5263 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5264 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5265 __func__)); 5266 5267 if ((pd->pf_mtag == NULL && 5268 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5269 pd->pf_mtag->routed++ > 3) { 5270 m0 = *m; 5271 *m = NULL; 5272 goto bad_locked; 5273 } 5274 5275 if (r->rt == PF_DUPTO) { 5276 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5277 if (s) 5278 PF_STATE_UNLOCK(s); 5279 return; 5280 } 5281 } else { 5282 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5283 if (s) 5284 PF_STATE_UNLOCK(s); 5285 return; 5286 } 5287 m0 = *m; 5288 } 5289 5290 ip = mtod(m0, struct ip *); 5291 5292 bzero(&dst, sizeof(dst)); 5293 dst.sin_family = AF_INET; 5294 dst.sin_len = sizeof(dst); 5295 dst.sin_addr = ip->ip_dst; 5296 5297 if (r->rt == PF_FASTROUTE) { 5298 struct rtentry *rt; 5299 5300 if (s) 5301 PF_STATE_UNLOCK(s); 5302 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5303 if (rt == NULL) { 5304 KMOD_IPSTAT_INC(ips_noroute); 5305 error = EHOSTUNREACH; 5306 goto bad; 5307 } 5308 5309 ifp = rt->rt_ifp; 5310 counter_u64_add(rt->rt_pksent, 1); 5311 5312 if (rt->rt_flags & RTF_GATEWAY) 5313 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5314 RTFREE_LOCKED(rt); 5315 } else { 5316 if (TAILQ_EMPTY(&r->rpool.list)) { 5317 DPFPRINTF(PF_DEBUG_URGENT, 5318 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5319 goto bad_locked; 5320 } 5321 if (s == NULL) { 5322 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5323 &naddr, NULL, &sn); 5324 if (!PF_AZERO(&naddr, AF_INET)) 5325 dst.sin_addr.s_addr = naddr.v4.s_addr; 5326 ifp = r->rpool.cur->kif ? 5327 r->rpool.cur->kif->pfik_ifp : NULL; 5328 } else { 5329 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5330 dst.sin_addr.s_addr = 5331 s->rt_addr.v4.s_addr; 5332 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5333 PF_STATE_UNLOCK(s); 5334 } 5335 } 5336 if (ifp == NULL) 5337 goto bad; 5338 5339 if (oifp != ifp) { 5340 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5341 goto bad; 5342 else if (m0 == NULL) 5343 goto done; 5344 if (m0->m_len < sizeof(struct ip)) { 5345 DPFPRINTF(PF_DEBUG_URGENT, 5346 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5347 goto bad; 5348 } 5349 ip = mtod(m0, struct ip *); 5350 } 5351 5352 if (ifp->if_flags & IFF_LOOPBACK) 5353 m0->m_flags |= M_SKIP_FIREWALL; 5354 5355 ip_len = ntohs(ip->ip_len); 5356 ip_off = ntohs(ip->ip_off); 5357 5358 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5359 m0->m_pkthdr.csum_flags |= CSUM_IP; 5360 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5361 in_delayed_cksum(m0); 5362 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5363 } 5364#ifdef SCTP 5365 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 5366 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5367 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 5368 } 5369#endif 5370 5371 /* 5372 * If small enough for interface, or the interface will take 5373 * care of the fragmentation for us, we can just send directly. 5374 */ 5375 if (ip_len <= ifp->if_mtu || 5376 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5377 ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5378 ip->ip_sum = 0; 5379 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 5380 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5381 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 5382 } 5383 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 5384 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5385 goto done; 5386 } 5387 5388 /* Balk when DF bit is set or the interface didn't support TSO. */ 5389 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5390 error = EMSGSIZE; 5391 KMOD_IPSTAT_INC(ips_cantfrag); 5392 if (r->rt != PF_DUPTO) { 5393 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5394 ifp->if_mtu); 5395 goto done; 5396 } else 5397 goto bad; 5398 } 5399 5400 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 5401 if (error) 5402 goto bad; 5403 5404 for (; m0; m0 = m1) { 5405 m1 = m0->m_nextpkt; 5406 m0->m_nextpkt = NULL; 5407 if (error == 0) { 5408 m_clrprotoflags(m0); 5409 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5410 } else 5411 m_freem(m0); 5412 } 5413 5414 if (error == 0) 5415 KMOD_IPSTAT_INC(ips_fragmented); 5416 5417done: 5418 if (r->rt != PF_DUPTO) 5419 *m = NULL; 5420 return; 5421 5422bad_locked: 5423 if (s) 5424 PF_STATE_UNLOCK(s); 5425bad: 5426 m_freem(m0); 5427 goto done; 5428} 5429#endif /* INET */ 5430 5431#ifdef INET6 5432static void 5433pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5434 struct pf_state *s, struct pf_pdesc *pd) 5435{ 5436 struct mbuf *m0; 5437 struct sockaddr_in6 dst; 5438 struct ip6_hdr *ip6; 5439 struct ifnet *ifp = NULL; 5440 struct pf_addr naddr; 5441 struct pf_src_node *sn = NULL; 5442 5443 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5444 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5445 __func__)); 5446 5447 if ((pd->pf_mtag == NULL && 5448 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5449 pd->pf_mtag->routed++ > 3) { 5450 m0 = *m; 5451 *m = NULL; 5452 goto bad_locked; 5453 } 5454 5455 if (r->rt == PF_DUPTO) { 5456 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5457 if (s) 5458 PF_STATE_UNLOCK(s); 5459 return; 5460 } 5461 } else { 5462 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5463 if (s) 5464 PF_STATE_UNLOCK(s); 5465 return; 5466 } 5467 m0 = *m; 5468 } 5469 5470 ip6 = mtod(m0, struct ip6_hdr *); 5471 5472 bzero(&dst, sizeof(dst)); 5473 dst.sin6_family = AF_INET6; 5474 dst.sin6_len = sizeof(dst); 5475 dst.sin6_addr = ip6->ip6_dst; 5476 5477 /* Cheat. XXX why only in the v6 case??? */ 5478 if (r->rt == PF_FASTROUTE) { 5479 if (s) 5480 PF_STATE_UNLOCK(s); 5481 m0->m_flags |= M_SKIP_FIREWALL; 5482 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5483 *m = NULL; 5484 return; 5485 } 5486 5487 if (TAILQ_EMPTY(&r->rpool.list)) { 5488 DPFPRINTF(PF_DEBUG_URGENT, 5489 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5490 goto bad_locked; 5491 } 5492 if (s == NULL) { 5493 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5494 &naddr, NULL, &sn); 5495 if (!PF_AZERO(&naddr, AF_INET6)) 5496 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5497 &naddr, AF_INET6); 5498 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5499 } else { 5500 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5501 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5502 &s->rt_addr, AF_INET6); 5503 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5504 } 5505 5506 if (s) 5507 PF_STATE_UNLOCK(s); 5508 5509 if (ifp == NULL) 5510 goto bad; 5511 5512 if (oifp != ifp) { 5513 if (pf_test6(PF_FWD, ifp, &m0, NULL) != PF_PASS) 5514 goto bad; 5515 else if (m0 == NULL) 5516 goto done; 5517 if (m0->m_len < sizeof(struct ip6_hdr)) { 5518 DPFPRINTF(PF_DEBUG_URGENT, 5519 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5520 __func__)); 5521 goto bad; 5522 } 5523 ip6 = mtod(m0, struct ip6_hdr *); 5524 } 5525 5526 if (ifp->if_flags & IFF_LOOPBACK) 5527 m0->m_flags |= M_SKIP_FIREWALL; 5528 5529 /* 5530 * If the packet is too large for the outgoing interface, 5531 * send back an icmp6 error. 5532 */ 5533 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5534 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5535 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5536 nd6_output(ifp, ifp, m0, &dst, NULL); 5537 else { 5538 in6_ifstat_inc(ifp, ifs6_in_toobig); 5539 if (r->rt != PF_DUPTO) 5540 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5541 else 5542 goto bad; 5543 } 5544 5545done: 5546 if (r->rt != PF_DUPTO) 5547 *m = NULL; 5548 return; 5549 5550bad_locked: 5551 if (s) 5552 PF_STATE_UNLOCK(s); 5553bad: 5554 m_freem(m0); 5555 goto done; 5556} 5557#endif /* INET6 */ 5558 5559/* 5560 * FreeBSD supports cksum offloads for the following drivers. 5561 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5562 * ti(4), txp(4), xl(4) 5563 * 5564 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5565 * network driver performed cksum including pseudo header, need to verify 5566 * csum_data 5567 * CSUM_DATA_VALID : 5568 * network driver performed cksum, needs to additional pseudo header 5569 * cksum computation with partial csum_data(i.e. lack of H/W support for 5570 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5571 * 5572 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5573 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5574 * TCP/UDP layer. 5575 * Also, set csum_data to 0xffff to force cksum validation. 5576 */ 5577static int 5578pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5579{ 5580 u_int16_t sum = 0; 5581 int hw_assist = 0; 5582 struct ip *ip; 5583 5584 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5585 return (1); 5586 if (m->m_pkthdr.len < off + len) 5587 return (1); 5588 5589 switch (p) { 5590 case IPPROTO_TCP: 5591 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5592 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5593 sum = m->m_pkthdr.csum_data; 5594 } else { 5595 ip = mtod(m, struct ip *); 5596 sum = in_pseudo(ip->ip_src.s_addr, 5597 ip->ip_dst.s_addr, htonl((u_short)len + 5598 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5599 } 5600 sum ^= 0xffff; 5601 ++hw_assist; 5602 } 5603 break; 5604 case IPPROTO_UDP: 5605 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5606 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5607 sum = m->m_pkthdr.csum_data; 5608 } else { 5609 ip = mtod(m, struct ip *); 5610 sum = in_pseudo(ip->ip_src.s_addr, 5611 ip->ip_dst.s_addr, htonl((u_short)len + 5612 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5613 } 5614 sum ^= 0xffff; 5615 ++hw_assist; 5616 } 5617 break; 5618 case IPPROTO_ICMP: 5619#ifdef INET6 5620 case IPPROTO_ICMPV6: 5621#endif /* INET6 */ 5622 break; 5623 default: 5624 return (1); 5625 } 5626 5627 if (!hw_assist) { 5628 switch (af) { 5629 case AF_INET: 5630 if (p == IPPROTO_ICMP) { 5631 if (m->m_len < off) 5632 return (1); 5633 m->m_data += off; 5634 m->m_len -= off; 5635 sum = in_cksum(m, len); 5636 m->m_data -= off; 5637 m->m_len += off; 5638 } else { 5639 if (m->m_len < sizeof(struct ip)) 5640 return (1); 5641 sum = in4_cksum(m, p, off, len); 5642 } 5643 break; 5644#ifdef INET6 5645 case AF_INET6: 5646 if (m->m_len < sizeof(struct ip6_hdr)) 5647 return (1); 5648 sum = in6_cksum(m, p, off, len); 5649 break; 5650#endif /* INET6 */ 5651 default: 5652 return (1); 5653 } 5654 } 5655 if (sum) { 5656 switch (p) { 5657 case IPPROTO_TCP: 5658 { 5659 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5660 break; 5661 } 5662 case IPPROTO_UDP: 5663 { 5664 KMOD_UDPSTAT_INC(udps_badsum); 5665 break; 5666 } 5667#ifdef INET 5668 case IPPROTO_ICMP: 5669 { 5670 KMOD_ICMPSTAT_INC(icps_checksum); 5671 break; 5672 } 5673#endif 5674#ifdef INET6 5675 case IPPROTO_ICMPV6: 5676 { 5677 KMOD_ICMP6STAT_INC(icp6s_checksum); 5678 break; 5679 } 5680#endif /* INET6 */ 5681 } 5682 return (1); 5683 } else { 5684 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5685 m->m_pkthdr.csum_flags |= 5686 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5687 m->m_pkthdr.csum_data = 0xffff; 5688 } 5689 } 5690 return (0); 5691} 5692 5693 5694#ifdef INET 5695int 5696pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5697{ 5698 struct pfi_kif *kif; 5699 u_short action, reason = 0, log = 0; 5700 struct mbuf *m = *m0; 5701 struct ip *h = NULL; 5702 struct m_tag *ipfwtag; 5703 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5704 struct pf_state *s = NULL; 5705 struct pf_ruleset *ruleset = NULL; 5706 struct pf_pdesc pd; 5707 int off, dirndx, pqid = 0; 5708 5709 M_ASSERTPKTHDR(m); 5710 5711 if (!V_pf_status.running) 5712 return (PF_PASS); 5713 5714 memset(&pd, 0, sizeof(pd)); 5715 5716 kif = (struct pfi_kif *)ifp->if_pf_kif; 5717 5718 if (kif == NULL) { 5719 DPFPRINTF(PF_DEBUG_URGENT, 5720 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5721 return (PF_DROP); 5722 } 5723 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5724 return (PF_PASS); 5725 5726 if (m->m_flags & M_SKIP_FIREWALL) 5727 return (PF_PASS); 5728 5729 pd.pf_mtag = pf_find_mtag(m); 5730 5731 PF_RULES_RLOCK(); 5732 5733 if (ip_divert_ptr != NULL && 5734 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5735 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5736 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5737 if (pd.pf_mtag == NULL && 5738 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5739 action = PF_DROP; 5740 goto done; 5741 } 5742 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5743 m_tag_delete(m, ipfwtag); 5744 } 5745 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5746 m->m_flags |= M_FASTFWD_OURS; 5747 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5748 } 5749 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5750 /* We do IP header normalization and packet reassembly here */ 5751 action = PF_DROP; 5752 goto done; 5753 } 5754 m = *m0; /* pf_normalize messes with m0 */ 5755 h = mtod(m, struct ip *); 5756 5757 off = h->ip_hl << 2; 5758 if (off < (int)sizeof(struct ip)) { 5759 action = PF_DROP; 5760 REASON_SET(&reason, PFRES_SHORT); 5761 log = 1; 5762 goto done; 5763 } 5764 5765 pd.src = (struct pf_addr *)&h->ip_src; 5766 pd.dst = (struct pf_addr *)&h->ip_dst; 5767 pd.sport = pd.dport = NULL; 5768 pd.ip_sum = &h->ip_sum; 5769 pd.proto_sum = NULL; 5770 pd.proto = h->ip_p; 5771 pd.dir = dir; 5772 pd.sidx = (dir == PF_IN) ? 0 : 1; 5773 pd.didx = (dir == PF_IN) ? 1 : 0; 5774 pd.af = AF_INET; 5775 pd.tos = h->ip_tos; 5776 pd.tot_len = ntohs(h->ip_len); 5777 5778 /* handle fragments that didn't get reassembled by normalization */ 5779 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5780 action = pf_test_fragment(&r, dir, kif, m, h, 5781 &pd, &a, &ruleset); 5782 goto done; 5783 } 5784 5785 switch (h->ip_p) { 5786 5787 case IPPROTO_TCP: { 5788 struct tcphdr th; 5789 5790 pd.hdr.tcp = &th; 5791 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5792 &action, &reason, AF_INET)) { 5793 log = action != PF_PASS; 5794 goto done; 5795 } 5796 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5797 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5798 pqid = 1; 5799 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5800 if (action == PF_DROP) 5801 goto done; 5802 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5803 &reason); 5804 if (action == PF_PASS) { 5805 if (pfsync_update_state_ptr != NULL) 5806 pfsync_update_state_ptr(s); 5807 r = s->rule.ptr; 5808 a = s->anchor.ptr; 5809 log = s->log; 5810 } else if (s == NULL) 5811 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5812 &a, &ruleset, inp); 5813 break; 5814 } 5815 5816 case IPPROTO_UDP: { 5817 struct udphdr uh; 5818 5819 pd.hdr.udp = &uh; 5820 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5821 &action, &reason, AF_INET)) { 5822 log = action != PF_PASS; 5823 goto done; 5824 } 5825 if (uh.uh_dport == 0 || 5826 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5827 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5828 action = PF_DROP; 5829 REASON_SET(&reason, PFRES_SHORT); 5830 goto done; 5831 } 5832 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5833 if (action == PF_PASS) { 5834 if (pfsync_update_state_ptr != NULL) 5835 pfsync_update_state_ptr(s); 5836 r = s->rule.ptr; 5837 a = s->anchor.ptr; 5838 log = s->log; 5839 } else if (s == NULL) 5840 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5841 &a, &ruleset, inp); 5842 break; 5843 } 5844 5845 case IPPROTO_ICMP: { 5846 struct icmp ih; 5847 5848 pd.hdr.icmp = &ih; 5849 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5850 &action, &reason, AF_INET)) { 5851 log = action != PF_PASS; 5852 goto done; 5853 } 5854 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5855 &reason); 5856 if (action == PF_PASS) { 5857 if (pfsync_update_state_ptr != NULL) 5858 pfsync_update_state_ptr(s); 5859 r = s->rule.ptr; 5860 a = s->anchor.ptr; 5861 log = s->log; 5862 } else if (s == NULL) 5863 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5864 &a, &ruleset, inp); 5865 break; 5866 } 5867 5868#ifdef INET6 5869 case IPPROTO_ICMPV6: { 5870 action = PF_DROP; 5871 DPFPRINTF(PF_DEBUG_MISC, 5872 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5873 goto done; 5874 } 5875#endif 5876 5877 default: 5878 action = pf_test_state_other(&s, dir, kif, m, &pd); 5879 if (action == PF_PASS) { 5880 if (pfsync_update_state_ptr != NULL) 5881 pfsync_update_state_ptr(s); 5882 r = s->rule.ptr; 5883 a = s->anchor.ptr; 5884 log = s->log; 5885 } else if (s == NULL) 5886 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5887 &a, &ruleset, inp); 5888 break; 5889 } 5890 5891done: 5892 PF_RULES_RUNLOCK(); 5893 if (action == PF_PASS && h->ip_hl > 5 && 5894 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 5895 action = PF_DROP; 5896 REASON_SET(&reason, PFRES_IPOPTIONS); 5897 log = 1; 5898 DPFPRINTF(PF_DEBUG_MISC, 5899 ("pf: dropping packet with ip options\n")); 5900 } 5901 5902 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 5903 action = PF_DROP; 5904 REASON_SET(&reason, PFRES_MEMORY); 5905 } 5906 if (r->rtableid >= 0) 5907 M_SETFIB(m, r->rtableid); 5908 5909#ifdef ALTQ 5910 if (action == PF_PASS && r->qid) { 5911 if (pd.pf_mtag == NULL && 5912 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5913 action = PF_DROP; 5914 REASON_SET(&reason, PFRES_MEMORY); 5915 } else { 5916 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5917 pd.pf_mtag->qid = r->pqid; 5918 else 5919 pd.pf_mtag->qid = r->qid; 5920 /* Add hints for ecn. */ 5921 pd.pf_mtag->hdr = h; 5922 } 5923 5924 } 5925#endif /* ALTQ */ 5926 5927 /* 5928 * connections redirected to loopback should not match sockets 5929 * bound specifically to loopback due to security implications, 5930 * see tcp_input() and in_pcblookup_listen(). 5931 */ 5932 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5933 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5934 (s->nat_rule.ptr->action == PF_RDR || 5935 s->nat_rule.ptr->action == PF_BINAT) && 5936 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5937 m->m_flags |= M_SKIP_FIREWALL; 5938 5939 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 5940 !PACKET_LOOPED(&pd)) { 5941 5942 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 5943 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 5944 if (ipfwtag != NULL) { 5945 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 5946 ntohs(r->divert.port); 5947 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 5948 5949 if (s) 5950 PF_STATE_UNLOCK(s); 5951 5952 m_tag_prepend(m, ipfwtag); 5953 if (m->m_flags & M_FASTFWD_OURS) { 5954 if (pd.pf_mtag == NULL && 5955 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5956 action = PF_DROP; 5957 REASON_SET(&reason, PFRES_MEMORY); 5958 log = 1; 5959 DPFPRINTF(PF_DEBUG_MISC, 5960 ("pf: failed to allocate tag\n")); 5961 } else { 5962 pd.pf_mtag->flags |= 5963 PF_FASTFWD_OURS_PRESENT; 5964 m->m_flags &= ~M_FASTFWD_OURS; 5965 } 5966 } 5967 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 5968 *m0 = NULL; 5969 5970 return (action); 5971 } else { 5972 /* XXX: ipfw has the same behaviour! */ 5973 action = PF_DROP; 5974 REASON_SET(&reason, PFRES_MEMORY); 5975 log = 1; 5976 DPFPRINTF(PF_DEBUG_MISC, 5977 ("pf: failed to allocate divert tag\n")); 5978 } 5979 } 5980 5981 if (log) { 5982 struct pf_rule *lr; 5983 5984 if (s != NULL && s->nat_rule.ptr != NULL && 5985 s->nat_rule.ptr->log & PF_LOG_ALL) 5986 lr = s->nat_rule.ptr; 5987 else 5988 lr = r; 5989 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 5990 (s == NULL)); 5991 } 5992 5993 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5994 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5995 5996 if (action == PF_PASS || r->action == PF_DROP) { 5997 dirndx = (dir == PF_OUT); 5998 r->packets[dirndx]++; 5999 r->bytes[dirndx] += pd.tot_len; 6000 if (a != NULL) { 6001 a->packets[dirndx]++; 6002 a->bytes[dirndx] += pd.tot_len; 6003 } 6004 if (s != NULL) { 6005 if (s->nat_rule.ptr != NULL) { 6006 s->nat_rule.ptr->packets[dirndx]++; 6007 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6008 } 6009 if (s->src_node != NULL) { 6010 s->src_node->packets[dirndx]++; 6011 s->src_node->bytes[dirndx] += pd.tot_len; 6012 } 6013 if (s->nat_src_node != NULL) { 6014 s->nat_src_node->packets[dirndx]++; 6015 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6016 } 6017 dirndx = (dir == s->direction) ? 0 : 1; 6018 s->packets[dirndx]++; 6019 s->bytes[dirndx] += pd.tot_len; 6020 } 6021 tr = r; 6022 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6023 if (nr != NULL && r == &V_pf_default_rule) 6024 tr = nr; 6025 if (tr->src.addr.type == PF_ADDR_TABLE) 6026 pfr_update_stats(tr->src.addr.p.tbl, 6027 (s == NULL) ? pd.src : 6028 &s->key[(s->direction == PF_IN)]-> 6029 addr[(s->direction == PF_OUT)], 6030 pd.af, pd.tot_len, dir == PF_OUT, 6031 r->action == PF_PASS, tr->src.neg); 6032 if (tr->dst.addr.type == PF_ADDR_TABLE) 6033 pfr_update_stats(tr->dst.addr.p.tbl, 6034 (s == NULL) ? pd.dst : 6035 &s->key[(s->direction == PF_IN)]-> 6036 addr[(s->direction == PF_IN)], 6037 pd.af, pd.tot_len, dir == PF_OUT, 6038 r->action == PF_PASS, tr->dst.neg); 6039 } 6040 6041 switch (action) { 6042 case PF_SYNPROXY_DROP: 6043 m_freem(*m0); 6044 case PF_DEFER: 6045 *m0 = NULL; 6046 action = PF_PASS; 6047 break; 6048 case PF_DROP: 6049 m_freem(*m0); 6050 *m0 = NULL; 6051 break; 6052 default: 6053 /* pf_route() returns unlocked. */ 6054 if (r->rt) { 6055 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6056 return (action); 6057 } 6058 break; 6059 } 6060 if (s) 6061 PF_STATE_UNLOCK(s); 6062 6063 return (action); 6064} 6065#endif /* INET */ 6066 6067#ifdef INET6 6068int 6069pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6070{ 6071 struct pfi_kif *kif; 6072 u_short action, reason = 0, log = 0; 6073 struct mbuf *m = *m0, *n = NULL; 6074 struct m_tag *mtag; 6075 struct ip6_hdr *h = NULL; 6076 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6077 struct pf_state *s = NULL; 6078 struct pf_ruleset *ruleset = NULL; 6079 struct pf_pdesc pd; 6080 int off, terminal = 0, dirndx, rh_cnt = 0; 6081 int fwdir = dir; 6082 6083 M_ASSERTPKTHDR(m); 6084 6085 if (dir == PF_OUT && m->m_pkthdr.rcvif && ifp != m->m_pkthdr.rcvif) 6086 fwdir = PF_FWD; 6087 6088 if (!V_pf_status.running) 6089 return (PF_PASS); 6090 6091 memset(&pd, 0, sizeof(pd)); 6092 pd.pf_mtag = pf_find_mtag(m); 6093 6094 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6095 return (PF_PASS); 6096 6097 kif = (struct pfi_kif *)ifp->if_pf_kif; 6098 if (kif == NULL) { 6099 DPFPRINTF(PF_DEBUG_URGENT, 6100 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6101 return (PF_DROP); 6102 } 6103 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6104 return (PF_PASS); 6105 6106 if (m->m_flags & M_SKIP_FIREWALL) 6107 return (PF_PASS); 6108 6109 PF_RULES_RLOCK(); 6110 6111 /* We do IP header normalization and packet reassembly here */ 6112 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6113 action = PF_DROP; 6114 goto done; 6115 } 6116 m = *m0; /* pf_normalize messes with m0 */ 6117 h = mtod(m, struct ip6_hdr *); 6118 6119#if 1 6120 /* 6121 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6122 * will do something bad, so drop the packet for now. 6123 */ 6124 if (htons(h->ip6_plen) == 0) { 6125 action = PF_DROP; 6126 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6127 goto done; 6128 } 6129#endif 6130 6131 pd.src = (struct pf_addr *)&h->ip6_src; 6132 pd.dst = (struct pf_addr *)&h->ip6_dst; 6133 pd.sport = pd.dport = NULL; 6134 pd.ip_sum = NULL; 6135 pd.proto_sum = NULL; 6136 pd.dir = dir; 6137 pd.sidx = (dir == PF_IN) ? 0 : 1; 6138 pd.didx = (dir == PF_IN) ? 1 : 0; 6139 pd.af = AF_INET6; 6140 pd.tos = 0; 6141 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6142 6143 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6144 pd.proto = h->ip6_nxt; 6145 do { 6146 switch (pd.proto) { 6147 case IPPROTO_FRAGMENT: 6148 action = pf_test_fragment(&r, dir, kif, m, h, 6149 &pd, &a, &ruleset); 6150 if (action == PF_DROP) 6151 REASON_SET(&reason, PFRES_FRAG); 6152 goto done; 6153 case IPPROTO_ROUTING: { 6154 struct ip6_rthdr rthdr; 6155 6156 if (rh_cnt++) { 6157 DPFPRINTF(PF_DEBUG_MISC, 6158 ("pf: IPv6 more than one rthdr\n")); 6159 action = PF_DROP; 6160 REASON_SET(&reason, PFRES_IPOPTIONS); 6161 log = 1; 6162 goto done; 6163 } 6164 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6165 &reason, pd.af)) { 6166 DPFPRINTF(PF_DEBUG_MISC, 6167 ("pf: IPv6 short rthdr\n")); 6168 action = PF_DROP; 6169 REASON_SET(&reason, PFRES_SHORT); 6170 log = 1; 6171 goto done; 6172 } 6173 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6174 DPFPRINTF(PF_DEBUG_MISC, 6175 ("pf: IPv6 rthdr0\n")); 6176 action = PF_DROP; 6177 REASON_SET(&reason, PFRES_IPOPTIONS); 6178 log = 1; 6179 goto done; 6180 } 6181 /* FALLTHROUGH */ 6182 } 6183 case IPPROTO_AH: 6184 case IPPROTO_HOPOPTS: 6185 case IPPROTO_DSTOPTS: { 6186 /* get next header and header length */ 6187 struct ip6_ext opt6; 6188 6189 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6190 NULL, &reason, pd.af)) { 6191 DPFPRINTF(PF_DEBUG_MISC, 6192 ("pf: IPv6 short opt\n")); 6193 action = PF_DROP; 6194 log = 1; 6195 goto done; 6196 } 6197 if (pd.proto == IPPROTO_AH) 6198 off += (opt6.ip6e_len + 2) * 4; 6199 else 6200 off += (opt6.ip6e_len + 1) * 8; 6201 pd.proto = opt6.ip6e_nxt; 6202 /* goto the next header */ 6203 break; 6204 } 6205 default: 6206 terminal++; 6207 break; 6208 } 6209 } while (!terminal); 6210 6211 /* if there's no routing header, use unmodified mbuf for checksumming */ 6212 if (!n) 6213 n = m; 6214 6215 switch (pd.proto) { 6216 6217 case IPPROTO_TCP: { 6218 struct tcphdr th; 6219 6220 pd.hdr.tcp = &th; 6221 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6222 &action, &reason, AF_INET6)) { 6223 log = action != PF_PASS; 6224 goto done; 6225 } 6226 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6227 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6228 if (action == PF_DROP) 6229 goto done; 6230 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6231 &reason); 6232 if (action == PF_PASS) { 6233 if (pfsync_update_state_ptr != NULL) 6234 pfsync_update_state_ptr(s); 6235 r = s->rule.ptr; 6236 a = s->anchor.ptr; 6237 log = s->log; 6238 } else if (s == NULL) 6239 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6240 &a, &ruleset, inp); 6241 break; 6242 } 6243 6244 case IPPROTO_UDP: { 6245 struct udphdr uh; 6246 6247 pd.hdr.udp = &uh; 6248 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6249 &action, &reason, AF_INET6)) { 6250 log = action != PF_PASS; 6251 goto done; 6252 } 6253 if (uh.uh_dport == 0 || 6254 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6255 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6256 action = PF_DROP; 6257 REASON_SET(&reason, PFRES_SHORT); 6258 goto done; 6259 } 6260 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6261 if (action == PF_PASS) { 6262 if (pfsync_update_state_ptr != NULL) 6263 pfsync_update_state_ptr(s); 6264 r = s->rule.ptr; 6265 a = s->anchor.ptr; 6266 log = s->log; 6267 } else if (s == NULL) 6268 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6269 &a, &ruleset, inp); 6270 break; 6271 } 6272 6273 case IPPROTO_ICMP: { 6274 action = PF_DROP; 6275 DPFPRINTF(PF_DEBUG_MISC, 6276 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6277 goto done; 6278 } 6279 6280 case IPPROTO_ICMPV6: { 6281 struct icmp6_hdr ih; 6282 6283 pd.hdr.icmp6 = &ih; 6284 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6285 &action, &reason, AF_INET6)) { 6286 log = action != PF_PASS; 6287 goto done; 6288 } 6289 action = pf_test_state_icmp(&s, dir, kif, 6290 m, off, h, &pd, &reason); 6291 if (action == PF_PASS) { 6292 if (pfsync_update_state_ptr != NULL) 6293 pfsync_update_state_ptr(s); 6294 r = s->rule.ptr; 6295 a = s->anchor.ptr; 6296 log = s->log; 6297 } else if (s == NULL) 6298 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6299 &a, &ruleset, inp); 6300 break; 6301 } 6302 6303 default: 6304 action = pf_test_state_other(&s, dir, kif, m, &pd); 6305 if (action == PF_PASS) { 6306 if (pfsync_update_state_ptr != NULL) 6307 pfsync_update_state_ptr(s); 6308 r = s->rule.ptr; 6309 a = s->anchor.ptr; 6310 log = s->log; 6311 } else if (s == NULL) 6312 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6313 &a, &ruleset, inp); 6314 break; 6315 } 6316 6317done: 6318 PF_RULES_RUNLOCK(); 6319 if (n != m) { 6320 m_freem(n); 6321 n = NULL; 6322 } 6323 6324 /* handle dangerous IPv6 extension headers. */ 6325 if (action == PF_PASS && rh_cnt && 6326 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6327 action = PF_DROP; 6328 REASON_SET(&reason, PFRES_IPOPTIONS); 6329 log = 1; 6330 DPFPRINTF(PF_DEBUG_MISC, 6331 ("pf: dropping packet with dangerous v6 headers\n")); 6332 } 6333 6334 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6335 action = PF_DROP; 6336 REASON_SET(&reason, PFRES_MEMORY); 6337 } 6338 if (r->rtableid >= 0) 6339 M_SETFIB(m, r->rtableid); 6340 6341#ifdef ALTQ 6342 if (action == PF_PASS && r->qid) { 6343 if (pd.pf_mtag == NULL && 6344 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6345 action = PF_DROP; 6346 REASON_SET(&reason, PFRES_MEMORY); 6347 } else { 6348 if (pd.tos & IPTOS_LOWDELAY) 6349 pd.pf_mtag->qid = r->pqid; 6350 else 6351 pd.pf_mtag->qid = r->qid; 6352 /* Add hints for ecn. */ 6353 pd.pf_mtag->hdr = h; 6354 } 6355 } 6356#endif /* ALTQ */ 6357 6358 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6359 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6360 (s->nat_rule.ptr->action == PF_RDR || 6361 s->nat_rule.ptr->action == PF_BINAT) && 6362 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6363 m->m_flags |= M_SKIP_FIREWALL; 6364 6365 /* XXX: Anybody working on it?! */ 6366 if (r->divert.port) 6367 printf("pf: divert(9) is not supported for IPv6\n"); 6368 6369 if (log) { 6370 struct pf_rule *lr; 6371 6372 if (s != NULL && s->nat_rule.ptr != NULL && 6373 s->nat_rule.ptr->log & PF_LOG_ALL) 6374 lr = s->nat_rule.ptr; 6375 else 6376 lr = r; 6377 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6378 &pd, (s == NULL)); 6379 } 6380 6381 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6382 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6383 6384 if (action == PF_PASS || r->action == PF_DROP) { 6385 dirndx = (dir == PF_OUT); 6386 r->packets[dirndx]++; 6387 r->bytes[dirndx] += pd.tot_len; 6388 if (a != NULL) { 6389 a->packets[dirndx]++; 6390 a->bytes[dirndx] += pd.tot_len; 6391 } 6392 if (s != NULL) { 6393 if (s->nat_rule.ptr != NULL) { 6394 s->nat_rule.ptr->packets[dirndx]++; 6395 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6396 } 6397 if (s->src_node != NULL) { 6398 s->src_node->packets[dirndx]++; 6399 s->src_node->bytes[dirndx] += pd.tot_len; 6400 } 6401 if (s->nat_src_node != NULL) { 6402 s->nat_src_node->packets[dirndx]++; 6403 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6404 } 6405 dirndx = (dir == s->direction) ? 0 : 1; 6406 s->packets[dirndx]++; 6407 s->bytes[dirndx] += pd.tot_len; 6408 } 6409 tr = r; 6410 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6411 if (nr != NULL && r == &V_pf_default_rule) 6412 tr = nr; 6413 if (tr->src.addr.type == PF_ADDR_TABLE) 6414 pfr_update_stats(tr->src.addr.p.tbl, 6415 (s == NULL) ? pd.src : 6416 &s->key[(s->direction == PF_IN)]->addr[0], 6417 pd.af, pd.tot_len, dir == PF_OUT, 6418 r->action == PF_PASS, tr->src.neg); 6419 if (tr->dst.addr.type == PF_ADDR_TABLE) 6420 pfr_update_stats(tr->dst.addr.p.tbl, 6421 (s == NULL) ? pd.dst : 6422 &s->key[(s->direction == PF_IN)]->addr[1], 6423 pd.af, pd.tot_len, dir == PF_OUT, 6424 r->action == PF_PASS, tr->dst.neg); 6425 } 6426 6427 switch (action) { 6428 case PF_SYNPROXY_DROP: 6429 m_freem(*m0); 6430 case PF_DEFER: 6431 *m0 = NULL; 6432 action = PF_PASS; 6433 break; 6434 case PF_DROP: 6435 m_freem(*m0); 6436 *m0 = NULL; 6437 break; 6438 default: 6439 /* pf_route6() returns unlocked. */ 6440 if (r->rt) { 6441 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6442 return (action); 6443 } 6444 break; 6445 } 6446 6447 if (s) 6448 PF_STATE_UNLOCK(s); 6449 6450 /* If reassembled packet passed, create new fragments. */ 6451 if (action == PF_PASS && *m0 && fwdir == PF_FWD && 6452 (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL) 6453 action = pf_refragment6(ifp, m0, mtag); 6454 6455 return (action); 6456} 6457#endif /* INET6 */ 6458