pf.c revision 284571
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 284571 2015-06-18 20:34:39Z kp $"); 40 41#include "opt_inet.h" 42#include "opt_inet6.h" 43#include "opt_bpf.h" 44#include "opt_pf.h" 45 46#include <sys/param.h> 47#include <sys/bus.h> 48#include <sys/endian.h> 49#include <sys/hash.h> 50#include <sys/interrupt.h> 51#include <sys/kernel.h> 52#include <sys/kthread.h> 53#include <sys/limits.h> 54#include <sys/mbuf.h> 55#include <sys/md5.h> 56#include <sys/random.h> 57#include <sys/refcount.h> 58#include <sys/socket.h> 59#include <sys/sysctl.h> 60#include <sys/taskqueue.h> 61#include <sys/ucred.h> 62 63#include <net/if.h> 64#include <net/if_types.h> 65#include <net/route.h> 66#include <net/radix_mpath.h> 67#include <net/vnet.h> 68 69#include <net/pfvar.h> 70#include <net/if_pflog.h> 71#include <net/if_pfsync.h> 72 73#include <netinet/in_pcb.h> 74#include <netinet/in_var.h> 75#include <netinet/ip.h> 76#include <netinet/ip_fw.h> 77#include <netinet/ip_icmp.h> 78#include <netinet/icmp_var.h> 79#include <netinet/ip_var.h> 80#include <netinet/tcp.h> 81#include <netinet/tcp_fsm.h> 82#include <netinet/tcp_seq.h> 83#include <netinet/tcp_timer.h> 84#include <netinet/tcp_var.h> 85#include <netinet/udp.h> 86#include <netinet/udp_var.h> 87 88#include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */ 89 90#ifdef INET6 91#include <netinet/ip6.h> 92#include <netinet/icmp6.h> 93#include <netinet6/nd6.h> 94#include <netinet6/ip6_var.h> 95#include <netinet6/in6_pcb.h> 96#endif /* INET6 */ 97 98#include <machine/in_cksum.h> 99#include <security/mac/mac_framework.h> 100 101#define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 102 103/* 104 * Global variables 105 */ 106 107/* state tables */ 108VNET_DEFINE(struct pf_altqqueue, pf_altqs[2]); 109VNET_DEFINE(struct pf_palist, pf_pabuf); 110VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 111VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 112VNET_DEFINE(struct pf_kstatus, pf_status); 113 114VNET_DEFINE(u_int32_t, ticket_altqs_active); 115VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 116VNET_DEFINE(int, altqs_inactive_open); 117VNET_DEFINE(u_int32_t, ticket_pabuf); 118 119VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 120#define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 121VNET_DEFINE(u_char, pf_tcp_secret[16]); 122#define V_pf_tcp_secret VNET(pf_tcp_secret) 123VNET_DEFINE(int, pf_tcp_secret_init); 124#define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 125VNET_DEFINE(int, pf_tcp_iss_off); 126#define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 127 128/* 129 * Queue for pf_intr() sends. 130 */ 131static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 132struct pf_send_entry { 133 STAILQ_ENTRY(pf_send_entry) pfse_next; 134 struct mbuf *pfse_m; 135 enum { 136 PFSE_IP, 137 PFSE_IP6, 138 PFSE_ICMP, 139 PFSE_ICMP6, 140 } pfse_type; 141 union { 142 struct route ro; 143 struct { 144 int type; 145 int code; 146 int mtu; 147 } icmpopts; 148 } u; 149#define pfse_ro u.ro 150#define pfse_icmp_type u.icmpopts.type 151#define pfse_icmp_code u.icmpopts.code 152#define pfse_icmp_mtu u.icmpopts.mtu 153}; 154 155STAILQ_HEAD(pf_send_head, pf_send_entry); 156static VNET_DEFINE(struct pf_send_head, pf_sendqueue); 157#define V_pf_sendqueue VNET(pf_sendqueue) 158 159static struct mtx pf_sendqueue_mtx; 160#define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 161#define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 162 163/* 164 * Queue for pf_overload_task() tasks. 165 */ 166struct pf_overload_entry { 167 SLIST_ENTRY(pf_overload_entry) next; 168 struct pf_addr addr; 169 sa_family_t af; 170 uint8_t dir; 171 struct pf_rule *rule; 172}; 173 174SLIST_HEAD(pf_overload_head, pf_overload_entry); 175static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue); 176#define V_pf_overloadqueue VNET(pf_overloadqueue) 177static VNET_DEFINE(struct task, pf_overloadtask); 178#define V_pf_overloadtask VNET(pf_overloadtask) 179 180static struct mtx pf_overloadqueue_mtx; 181#define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) 182#define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) 183 184VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules); 185struct mtx pf_unlnkdrules_mtx; 186 187static VNET_DEFINE(uma_zone_t, pf_sources_z); 188#define V_pf_sources_z VNET(pf_sources_z) 189uma_zone_t pf_mtag_z; 190VNET_DEFINE(uma_zone_t, pf_state_z); 191VNET_DEFINE(uma_zone_t, pf_state_key_z); 192 193VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]); 194#define PFID_CPUBITS 8 195#define PFID_CPUSHIFT (sizeof(uint64_t) * NBBY - PFID_CPUBITS) 196#define PFID_CPUMASK ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT) 197#define PFID_MAXID (~PFID_CPUMASK) 198CTASSERT((1 << PFID_CPUBITS) >= MAXCPU); 199 200static void pf_src_tree_remove_state(struct pf_state *); 201static void pf_init_threshold(struct pf_threshold *, u_int32_t, 202 u_int32_t); 203static void pf_add_threshold(struct pf_threshold *); 204static int pf_check_threshold(struct pf_threshold *); 205 206static void pf_change_ap(struct 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 || returnlocked == 0) 659 PF_HASHROW_UNLOCK(sh); 660 661 return (n); 662} 663 664static int 665pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 666 struct pf_addr *src, sa_family_t af) 667{ 668 669 KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK || 670 rule->rpool.opts & PF_POOL_STICKYADDR), 671 ("%s for non-tracking rule %p", __func__, rule)); 672 673 if (*sn == NULL) 674 *sn = pf_find_src_node(src, rule, af, 1); 675 676 if (*sn == NULL) { 677 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 678 679 PF_HASHROW_ASSERT(sh); 680 681 if (!rule->max_src_nodes || 682 counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes) 683 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 684 else 685 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 686 1); 687 if ((*sn) == NULL) { 688 PF_HASHROW_UNLOCK(sh); 689 return (-1); 690 } 691 692 pf_init_threshold(&(*sn)->conn_rate, 693 rule->max_src_conn_rate.limit, 694 rule->max_src_conn_rate.seconds); 695 696 (*sn)->af = af; 697 (*sn)->rule.ptr = rule; 698 PF_ACPY(&(*sn)->addr, src, af); 699 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 700 (*sn)->creation = time_uptime; 701 (*sn)->ruletype = rule->action; 702 if ((*sn)->rule.ptr != NULL) 703 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 704 PF_HASHROW_UNLOCK(sh); 705 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 706 } else { 707 if (rule->max_src_states && 708 (*sn)->states >= rule->max_src_states) { 709 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 710 1); 711 return (-1); 712 } 713 } 714 return (0); 715} 716 717void 718pf_unlink_src_node_locked(struct pf_src_node *src) 719{ 720#ifdef INVARIANTS 721 struct pf_srchash *sh; 722 723 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 724 PF_HASHROW_ASSERT(sh); 725#endif 726 LIST_REMOVE(src, entry); 727 if (src->rule.ptr) 728 counter_u64_add(src->rule.ptr->src_nodes, -1); 729 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 730} 731 732void 733pf_unlink_src_node(struct pf_src_node *src) 734{ 735 struct pf_srchash *sh; 736 737 sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)]; 738 PF_HASHROW_LOCK(sh); 739 pf_unlink_src_node_locked(src); 740 PF_HASHROW_UNLOCK(sh); 741} 742 743static void 744pf_free_src_node(struct pf_src_node *sn) 745{ 746 747 KASSERT(sn->states == 0, ("%s: %p has refs", __func__, sn)); 748 uma_zfree(V_pf_sources_z, sn); 749} 750 751u_int 752pf_free_src_nodes(struct pf_src_node_list *head) 753{ 754 struct pf_src_node *sn, *tmp; 755 u_int count = 0; 756 757 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 758 pf_free_src_node(sn); 759 count++; 760 } 761 762 return (count); 763} 764 765void 766pf_mtag_initialize() 767{ 768 769 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 770 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 771 UMA_ALIGN_PTR, 0); 772} 773 774/* Per-vnet data storage structures initialization. */ 775void 776pf_initialize() 777{ 778 struct pf_keyhash *kh; 779 struct pf_idhash *ih; 780 struct pf_srchash *sh; 781 u_int i; 782 783 TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &pf_hashsize); 784 if (pf_hashsize == 0 || !powerof2(pf_hashsize)) 785 pf_hashsize = PF_HASHSIZ; 786 TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &pf_srchashsize); 787 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) 788 pf_srchashsize = PF_HASHSIZ / 4; 789 790 V_pf_hashseed = arc4random(); 791 792 /* States and state keys storage. */ 793 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), 794 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 795 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 796 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 797 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 798 799 V_pf_state_key_z = uma_zcreate("pf state keys", 800 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 801 UMA_ALIGN_PTR, 0); 802 V_pf_keyhash = malloc(pf_hashsize * sizeof(struct pf_keyhash), 803 M_PFHASH, M_WAITOK | M_ZERO); 804 V_pf_idhash = malloc(pf_hashsize * sizeof(struct pf_idhash), 805 M_PFHASH, M_WAITOK | M_ZERO); 806 pf_hashmask = pf_hashsize - 1; 807 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 808 i++, kh++, ih++) { 809 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 810 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 811 } 812 813 /* Source nodes. */ 814 V_pf_sources_z = uma_zcreate("pf source nodes", 815 sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 816 0); 817 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 818 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 819 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 820 V_pf_srchash = malloc(pf_srchashsize * sizeof(struct pf_srchash), 821 M_PFHASH, M_WAITOK|M_ZERO); 822 pf_srchashmask = pf_srchashsize - 1; 823 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) 824 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 825 826 /* ALTQ */ 827 TAILQ_INIT(&V_pf_altqs[0]); 828 TAILQ_INIT(&V_pf_altqs[1]); 829 TAILQ_INIT(&V_pf_pabuf); 830 V_pf_altqs_active = &V_pf_altqs[0]; 831 V_pf_altqs_inactive = &V_pf_altqs[1]; 832 833 834 /* Send & overload+flush queues. */ 835 STAILQ_INIT(&V_pf_sendqueue); 836 SLIST_INIT(&V_pf_overloadqueue); 837 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 838 mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF); 839 mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL, 840 MTX_DEF); 841 842 /* Unlinked, but may be referenced rules. */ 843 TAILQ_INIT(&V_pf_unlinked_rules); 844 mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF); 845} 846 847void 848pf_mtag_cleanup() 849{ 850 851 uma_zdestroy(pf_mtag_z); 852} 853 854void 855pf_cleanup() 856{ 857 struct pf_keyhash *kh; 858 struct pf_idhash *ih; 859 struct pf_srchash *sh; 860 struct pf_send_entry *pfse, *next; 861 u_int i; 862 863 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 864 i++, kh++, ih++) { 865 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 866 __func__)); 867 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 868 __func__)); 869 mtx_destroy(&kh->lock); 870 mtx_destroy(&ih->lock); 871 } 872 free(V_pf_keyhash, M_PFHASH); 873 free(V_pf_idhash, M_PFHASH); 874 875 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 876 KASSERT(LIST_EMPTY(&sh->nodes), 877 ("%s: source node hash not empty", __func__)); 878 mtx_destroy(&sh->lock); 879 } 880 free(V_pf_srchash, M_PFHASH); 881 882 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 883 m_freem(pfse->pfse_m); 884 free(pfse, M_PFTEMP); 885 } 886 887 mtx_destroy(&pf_sendqueue_mtx); 888 mtx_destroy(&pf_overloadqueue_mtx); 889 mtx_destroy(&pf_unlnkdrules_mtx); 890 891 uma_zdestroy(V_pf_sources_z); 892 uma_zdestroy(V_pf_state_z); 893 uma_zdestroy(V_pf_state_key_z); 894} 895 896static int 897pf_mtag_uminit(void *mem, int size, int how) 898{ 899 struct m_tag *t; 900 901 t = (struct m_tag *)mem; 902 t->m_tag_cookie = MTAG_ABI_COMPAT; 903 t->m_tag_id = PACKET_TAG_PF; 904 t->m_tag_len = sizeof(struct pf_mtag); 905 t->m_tag_free = pf_mtag_free; 906 907 return (0); 908} 909 910static void 911pf_mtag_free(struct m_tag *t) 912{ 913 914 uma_zfree(pf_mtag_z, t); 915} 916 917struct pf_mtag * 918pf_get_mtag(struct mbuf *m) 919{ 920 struct m_tag *mtag; 921 922 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 923 return ((struct pf_mtag *)(mtag + 1)); 924 925 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 926 if (mtag == NULL) 927 return (NULL); 928 bzero(mtag + 1, sizeof(struct pf_mtag)); 929 m_tag_prepend(m, mtag); 930 931 return ((struct pf_mtag *)(mtag + 1)); 932} 933 934static int 935pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 936 struct pf_state *s) 937{ 938 struct pf_keyhash *khs, *khw, *kh; 939 struct pf_state_key *sk, *cur; 940 struct pf_state *si, *olds = NULL; 941 int idx; 942 943 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 944 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 945 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 946 947 /* 948 * We need to lock hash slots of both keys. To avoid deadlock 949 * we always lock the slot with lower address first. Unlock order 950 * isn't important. 951 * 952 * We also need to lock ID hash slot before dropping key 953 * locks. On success we return with ID hash slot locked. 954 */ 955 956 if (skw == sks) { 957 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 958 PF_HASHROW_LOCK(khs); 959 } else { 960 khs = &V_pf_keyhash[pf_hashkey(sks)]; 961 khw = &V_pf_keyhash[pf_hashkey(skw)]; 962 if (khs == khw) { 963 PF_HASHROW_LOCK(khs); 964 } else if (khs < khw) { 965 PF_HASHROW_LOCK(khs); 966 PF_HASHROW_LOCK(khw); 967 } else { 968 PF_HASHROW_LOCK(khw); 969 PF_HASHROW_LOCK(khs); 970 } 971 } 972 973#define KEYS_UNLOCK() do { \ 974 if (khs != khw) { \ 975 PF_HASHROW_UNLOCK(khs); \ 976 PF_HASHROW_UNLOCK(khw); \ 977 } else \ 978 PF_HASHROW_UNLOCK(khs); \ 979} while (0) 980 981 /* 982 * First run: start with wire key. 983 */ 984 sk = skw; 985 kh = khw; 986 idx = PF_SK_WIRE; 987 988keyattach: 989 LIST_FOREACH(cur, &kh->keys, entry) 990 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 991 break; 992 993 if (cur != NULL) { 994 /* Key exists. Check for same kif, if none, add to key. */ 995 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 996 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 997 998 PF_HASHROW_LOCK(ih); 999 if (si->kif == s->kif && 1000 si->direction == s->direction) { 1001 if (sk->proto == IPPROTO_TCP && 1002 si->src.state >= TCPS_FIN_WAIT_2 && 1003 si->dst.state >= TCPS_FIN_WAIT_2) { 1004 /* 1005 * New state matches an old >FIN_WAIT_2 1006 * state. We can't drop key hash locks, 1007 * thus we can't unlink it properly. 1008 * 1009 * As a workaround we drop it into 1010 * TCPS_CLOSED state, schedule purge 1011 * ASAP and push it into the very end 1012 * of the slot TAILQ, so that it won't 1013 * conflict with our new state. 1014 */ 1015 si->src.state = si->dst.state = 1016 TCPS_CLOSED; 1017 si->timeout = PFTM_PURGE; 1018 olds = si; 1019 } else { 1020 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1021 printf("pf: %s key attach " 1022 "failed on %s: ", 1023 (idx == PF_SK_WIRE) ? 1024 "wire" : "stack", 1025 s->kif->pfik_name); 1026 pf_print_state_parts(s, 1027 (idx == PF_SK_WIRE) ? 1028 sk : NULL, 1029 (idx == PF_SK_STACK) ? 1030 sk : NULL); 1031 printf(", existing: "); 1032 pf_print_state_parts(si, 1033 (idx == PF_SK_WIRE) ? 1034 sk : NULL, 1035 (idx == PF_SK_STACK) ? 1036 sk : NULL); 1037 printf("\n"); 1038 } 1039 PF_HASHROW_UNLOCK(ih); 1040 KEYS_UNLOCK(); 1041 uma_zfree(V_pf_state_key_z, sk); 1042 if (idx == PF_SK_STACK) 1043 pf_detach_state(s); 1044 return (EEXIST); /* collision! */ 1045 } 1046 } 1047 PF_HASHROW_UNLOCK(ih); 1048 } 1049 uma_zfree(V_pf_state_key_z, sk); 1050 s->key[idx] = cur; 1051 } else { 1052 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1053 s->key[idx] = sk; 1054 } 1055 1056stateattach: 1057 /* List is sorted, if-bound states before floating. */ 1058 if (s->kif == V_pfi_all) 1059 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1060 else 1061 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1062 1063 if (olds) { 1064 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1065 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1066 key_list[idx]); 1067 olds = NULL; 1068 } 1069 1070 /* 1071 * Attach done. See how should we (or should not?) 1072 * attach a second key. 1073 */ 1074 if (sks == skw) { 1075 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1076 idx = PF_SK_STACK; 1077 sks = NULL; 1078 goto stateattach; 1079 } else if (sks != NULL) { 1080 /* 1081 * Continue attaching with stack key. 1082 */ 1083 sk = sks; 1084 kh = khs; 1085 idx = PF_SK_STACK; 1086 sks = NULL; 1087 goto keyattach; 1088 } 1089 1090 PF_STATE_LOCK(s); 1091 KEYS_UNLOCK(); 1092 1093 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1094 ("%s failure", __func__)); 1095 1096 return (0); 1097#undef KEYS_UNLOCK 1098} 1099 1100static void 1101pf_detach_state(struct pf_state *s) 1102{ 1103 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1104 struct pf_keyhash *kh; 1105 1106 if (sks != NULL) { 1107 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1108 PF_HASHROW_LOCK(kh); 1109 if (s->key[PF_SK_STACK] != NULL) 1110 pf_state_key_detach(s, PF_SK_STACK); 1111 /* 1112 * If both point to same key, then we are done. 1113 */ 1114 if (sks == s->key[PF_SK_WIRE]) { 1115 pf_state_key_detach(s, PF_SK_WIRE); 1116 PF_HASHROW_UNLOCK(kh); 1117 return; 1118 } 1119 PF_HASHROW_UNLOCK(kh); 1120 } 1121 1122 if (s->key[PF_SK_WIRE] != NULL) { 1123 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1124 PF_HASHROW_LOCK(kh); 1125 if (s->key[PF_SK_WIRE] != NULL) 1126 pf_state_key_detach(s, PF_SK_WIRE); 1127 PF_HASHROW_UNLOCK(kh); 1128 } 1129} 1130 1131static void 1132pf_state_key_detach(struct pf_state *s, int idx) 1133{ 1134 struct pf_state_key *sk = s->key[idx]; 1135#ifdef INVARIANTS 1136 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1137 1138 PF_HASHROW_ASSERT(kh); 1139#endif 1140 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1141 s->key[idx] = NULL; 1142 1143 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1144 LIST_REMOVE(sk, entry); 1145 uma_zfree(V_pf_state_key_z, sk); 1146 } 1147} 1148 1149static int 1150pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1151{ 1152 struct pf_state_key *sk = mem; 1153 1154 bzero(sk, sizeof(struct pf_state_key_cmp)); 1155 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1156 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1157 1158 return (0); 1159} 1160 1161struct pf_state_key * 1162pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1163 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1164{ 1165 struct pf_state_key *sk; 1166 1167 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1168 if (sk == NULL) 1169 return (NULL); 1170 1171 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1172 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1173 sk->port[pd->sidx] = sport; 1174 sk->port[pd->didx] = dport; 1175 sk->proto = pd->proto; 1176 sk->af = pd->af; 1177 1178 return (sk); 1179} 1180 1181struct pf_state_key * 1182pf_state_key_clone(struct pf_state_key *orig) 1183{ 1184 struct pf_state_key *sk; 1185 1186 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1187 if (sk == NULL) 1188 return (NULL); 1189 1190 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1191 1192 return (sk); 1193} 1194 1195int 1196pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, 1197 struct pf_state_key *sks, struct pf_state *s) 1198{ 1199 struct pf_idhash *ih; 1200 struct pf_state *cur; 1201 int error; 1202 1203 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1204 ("%s: sks not pristine", __func__)); 1205 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1206 ("%s: skw not pristine", __func__)); 1207 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1208 1209 s->kif = kif; 1210 1211 if (s->id == 0 && s->creatorid == 0) { 1212 /* XXX: should be atomic, but probability of collision low */ 1213 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID) 1214 V_pf_stateid[curcpu] = 1; 1215 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT; 1216 s->id = htobe64(s->id); 1217 s->creatorid = V_pf_status.hostid; 1218 } 1219 1220 /* Returns with ID locked on success. */ 1221 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1222 return (error); 1223 1224 ih = &V_pf_idhash[PF_IDHASH(s)]; 1225 PF_HASHROW_ASSERT(ih); 1226 LIST_FOREACH(cur, &ih->states, entry) 1227 if (cur->id == s->id && cur->creatorid == s->creatorid) 1228 break; 1229 1230 if (cur != NULL) { 1231 PF_HASHROW_UNLOCK(ih); 1232 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1233 printf("pf: state ID collision: " 1234 "id: %016llx creatorid: %08x\n", 1235 (unsigned long long)be64toh(s->id), 1236 ntohl(s->creatorid)); 1237 } 1238 pf_detach_state(s); 1239 return (EEXIST); 1240 } 1241 LIST_INSERT_HEAD(&ih->states, s, entry); 1242 /* One for keys, one for ID hash. */ 1243 refcount_init(&s->refs, 2); 1244 1245 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1246 if (pfsync_insert_state_ptr != NULL) 1247 pfsync_insert_state_ptr(s); 1248 1249 /* Returns locked. */ 1250 return (0); 1251} 1252 1253/* 1254 * Find state by ID: returns with locked row on success. 1255 */ 1256struct pf_state * 1257pf_find_state_byid(uint64_t id, uint32_t creatorid) 1258{ 1259 struct pf_idhash *ih; 1260 struct pf_state *s; 1261 1262 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1263 1264 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; 1265 1266 PF_HASHROW_LOCK(ih); 1267 LIST_FOREACH(s, &ih->states, entry) 1268 if (s->id == id && s->creatorid == creatorid) 1269 break; 1270 1271 if (s == NULL) 1272 PF_HASHROW_UNLOCK(ih); 1273 1274 return (s); 1275} 1276 1277/* 1278 * Find state by key. 1279 * Returns with ID hash slot locked on success. 1280 */ 1281static struct pf_state * 1282pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir) 1283{ 1284 struct pf_keyhash *kh; 1285 struct pf_state_key *sk; 1286 struct pf_state *s; 1287 int idx; 1288 1289 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1290 1291 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1292 1293 PF_HASHROW_LOCK(kh); 1294 LIST_FOREACH(sk, &kh->keys, entry) 1295 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1296 break; 1297 if (sk == NULL) { 1298 PF_HASHROW_UNLOCK(kh); 1299 return (NULL); 1300 } 1301 1302 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1303 1304 /* List is sorted, if-bound states before floating ones. */ 1305 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1306 if (s->kif == V_pfi_all || s->kif == kif) { 1307 PF_STATE_LOCK(s); 1308 PF_HASHROW_UNLOCK(kh); 1309 if (s->timeout >= PFTM_MAX) { 1310 /* 1311 * State is either being processed by 1312 * pf_unlink_state() in an other thread, or 1313 * is scheduled for immediate expiry. 1314 */ 1315 PF_STATE_UNLOCK(s); 1316 return (NULL); 1317 } 1318 return (s); 1319 } 1320 PF_HASHROW_UNLOCK(kh); 1321 1322 return (NULL); 1323} 1324 1325struct pf_state * 1326pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1327{ 1328 struct pf_keyhash *kh; 1329 struct pf_state_key *sk; 1330 struct pf_state *s, *ret = NULL; 1331 int idx, inout = 0; 1332 1333 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1334 1335 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1336 1337 PF_HASHROW_LOCK(kh); 1338 LIST_FOREACH(sk, &kh->keys, entry) 1339 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1340 break; 1341 if (sk == NULL) { 1342 PF_HASHROW_UNLOCK(kh); 1343 return (NULL); 1344 } 1345 switch (dir) { 1346 case PF_IN: 1347 idx = PF_SK_WIRE; 1348 break; 1349 case PF_OUT: 1350 idx = PF_SK_STACK; 1351 break; 1352 case PF_INOUT: 1353 idx = PF_SK_WIRE; 1354 inout = 1; 1355 break; 1356 default: 1357 panic("%s: dir %u", __func__, dir); 1358 } 1359second_run: 1360 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1361 if (more == NULL) { 1362 PF_HASHROW_UNLOCK(kh); 1363 return (s); 1364 } 1365 1366 if (ret) 1367 (*more)++; 1368 else 1369 ret = s; 1370 } 1371 if (inout == 1) { 1372 inout = 0; 1373 idx = PF_SK_STACK; 1374 goto second_run; 1375 } 1376 PF_HASHROW_UNLOCK(kh); 1377 1378 return (ret); 1379} 1380 1381/* END state table stuff */ 1382 1383static void 1384pf_send(struct pf_send_entry *pfse) 1385{ 1386 1387 PF_SENDQ_LOCK(); 1388 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1389 PF_SENDQ_UNLOCK(); 1390 swi_sched(V_pf_swi_cookie, 0); 1391} 1392 1393void 1394pf_intr(void *v) 1395{ 1396 struct pf_send_head queue; 1397 struct pf_send_entry *pfse, *next; 1398 1399 CURVNET_SET((struct vnet *)v); 1400 1401 PF_SENDQ_LOCK(); 1402 queue = V_pf_sendqueue; 1403 STAILQ_INIT(&V_pf_sendqueue); 1404 PF_SENDQ_UNLOCK(); 1405 1406 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1407 switch (pfse->pfse_type) { 1408#ifdef INET 1409 case PFSE_IP: 1410 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL); 1411 break; 1412 case PFSE_ICMP: 1413 icmp_error(pfse->pfse_m, pfse->pfse_icmp_type, 1414 pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu); 1415 break; 1416#endif /* INET */ 1417#ifdef INET6 1418 case PFSE_IP6: 1419 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL, 1420 NULL); 1421 break; 1422 case PFSE_ICMP6: 1423 icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type, 1424 pfse->pfse_icmp_code, pfse->pfse_icmp_mtu); 1425 break; 1426#endif /* INET6 */ 1427 default: 1428 panic("%s: unknown type", __func__); 1429 } 1430 free(pfse, M_PFTEMP); 1431 } 1432 CURVNET_RESTORE(); 1433} 1434 1435void 1436pf_purge_thread(void *v) 1437{ 1438 u_int idx = 0; 1439 1440 CURVNET_SET((struct vnet *)v); 1441 1442 for (;;) { 1443 PF_RULES_RLOCK(); 1444 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10); 1445 1446 if (V_pf_end_threads) { 1447 /* 1448 * To cleanse up all kifs and rules we need 1449 * two runs: first one clears reference flags, 1450 * then pf_purge_expired_states() doesn't 1451 * raise them, and then second run frees. 1452 */ 1453 PF_RULES_RUNLOCK(); 1454 pf_purge_unlinked_rules(); 1455 pfi_kif_purge(); 1456 1457 /* 1458 * Now purge everything. 1459 */ 1460 pf_purge_expired_states(0, pf_hashmask); 1461 pf_purge_expired_fragments(); 1462 pf_purge_expired_src_nodes(); 1463 1464 /* 1465 * Now all kifs & rules should be unreferenced, 1466 * thus should be successfully freed. 1467 */ 1468 pf_purge_unlinked_rules(); 1469 pfi_kif_purge(); 1470 1471 /* 1472 * Announce success and exit. 1473 */ 1474 PF_RULES_RLOCK(); 1475 V_pf_end_threads++; 1476 PF_RULES_RUNLOCK(); 1477 wakeup(pf_purge_thread); 1478 kproc_exit(0); 1479 } 1480 PF_RULES_RUNLOCK(); 1481 1482 /* Process 1/interval fraction of the state table every run. */ 1483 idx = pf_purge_expired_states(idx, pf_hashmask / 1484 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1485 1486 /* Purge other expired types every PFTM_INTERVAL seconds. */ 1487 if (idx == 0) { 1488 /* 1489 * Order is important: 1490 * - states and src nodes reference rules 1491 * - states and rules reference kifs 1492 */ 1493 pf_purge_expired_fragments(); 1494 pf_purge_expired_src_nodes(); 1495 pf_purge_unlinked_rules(); 1496 pfi_kif_purge(); 1497 } 1498 } 1499 /* not reached */ 1500 CURVNET_RESTORE(); 1501} 1502 1503u_int32_t 1504pf_state_expires(const struct pf_state *state) 1505{ 1506 u_int32_t timeout; 1507 u_int32_t start; 1508 u_int32_t end; 1509 u_int32_t states; 1510 1511 /* handle all PFTM_* > PFTM_MAX here */ 1512 if (state->timeout == PFTM_PURGE) 1513 return (time_uptime); 1514 KASSERT(state->timeout != PFTM_UNLINKED, 1515 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1516 KASSERT((state->timeout < PFTM_MAX), 1517 ("pf_state_expires: timeout > PFTM_MAX")); 1518 timeout = state->rule.ptr->timeout[state->timeout]; 1519 if (!timeout) 1520 timeout = V_pf_default_rule.timeout[state->timeout]; 1521 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1522 if (start) { 1523 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1524 states = counter_u64_fetch(state->rule.ptr->states_cur); 1525 } else { 1526 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1527 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1528 states = V_pf_status.states; 1529 } 1530 if (end && states > start && start < end) { 1531 if (states < end) 1532 return (state->expire + timeout * (end - states) / 1533 (end - start)); 1534 else 1535 return (time_uptime); 1536 } 1537 return (state->expire + timeout); 1538} 1539 1540void 1541pf_purge_expired_src_nodes() 1542{ 1543 struct pf_src_node_list freelist; 1544 struct pf_srchash *sh; 1545 struct pf_src_node *cur, *next; 1546 int i; 1547 1548 LIST_INIT(&freelist); 1549 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1550 PF_HASHROW_LOCK(sh); 1551 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1552 if (cur->states == 0 && cur->expire <= time_uptime) { 1553 pf_unlink_src_node_locked(cur); 1554 LIST_INSERT_HEAD(&freelist, cur, entry); 1555 } else if (cur->rule.ptr != NULL) 1556 cur->rule.ptr->rule_flag |= PFRULE_REFS; 1557 PF_HASHROW_UNLOCK(sh); 1558 } 1559 1560 pf_free_src_nodes(&freelist); 1561 1562 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 1563} 1564 1565static void 1566pf_src_tree_remove_state(struct pf_state *s) 1567{ 1568 u_int32_t timeout; 1569 1570 if (s->src_node != NULL) { 1571 if (s->src.tcp_est) 1572 --s->src_node->conn; 1573 if (--s->src_node->states == 0) { 1574 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1575 if (!timeout) 1576 timeout = 1577 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1578 s->src_node->expire = time_uptime + timeout; 1579 } 1580 } 1581 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1582 if (--s->nat_src_node->states == 0) { 1583 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1584 if (!timeout) 1585 timeout = 1586 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1587 s->nat_src_node->expire = time_uptime + timeout; 1588 } 1589 } 1590 s->src_node = s->nat_src_node = NULL; 1591} 1592 1593/* 1594 * Unlink and potentilly free a state. Function may be 1595 * called with ID hash row locked, but always returns 1596 * unlocked, since it needs to go through key hash locking. 1597 */ 1598int 1599pf_unlink_state(struct pf_state *s, u_int flags) 1600{ 1601 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1602 1603 if ((flags & PF_ENTER_LOCKED) == 0) 1604 PF_HASHROW_LOCK(ih); 1605 else 1606 PF_HASHROW_ASSERT(ih); 1607 1608 if (s->timeout == PFTM_UNLINKED) { 1609 /* 1610 * State is being processed 1611 * by pf_unlink_state() in 1612 * an other thread. 1613 */ 1614 PF_HASHROW_UNLOCK(ih); 1615 return (0); /* XXXGL: undefined actually */ 1616 } 1617 1618 if (s->src.state == PF_TCPS_PROXY_DST) { 1619 /* XXX wire key the right one? */ 1620 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af, 1621 &s->key[PF_SK_WIRE]->addr[1], 1622 &s->key[PF_SK_WIRE]->addr[0], 1623 s->key[PF_SK_WIRE]->port[1], 1624 s->key[PF_SK_WIRE]->port[0], 1625 s->src.seqhi, s->src.seqlo + 1, 1626 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL); 1627 } 1628 1629 LIST_REMOVE(s, entry); 1630 pf_src_tree_remove_state(s); 1631 1632 if (pfsync_delete_state_ptr != NULL) 1633 pfsync_delete_state_ptr(s); 1634 1635 STATE_DEC_COUNTERS(s); 1636 1637 s->timeout = PFTM_UNLINKED; 1638 1639 PF_HASHROW_UNLOCK(ih); 1640 1641 pf_detach_state(s); 1642 refcount_release(&s->refs); 1643 1644 return (pf_release_state(s)); 1645} 1646 1647void 1648pf_free_state(struct pf_state *cur) 1649{ 1650 1651 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 1652 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 1653 cur->timeout)); 1654 1655 pf_normalize_tcp_cleanup(cur); 1656 uma_zfree(V_pf_state_z, cur); 1657 counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 1658} 1659 1660/* 1661 * Called only from pf_purge_thread(), thus serialized. 1662 */ 1663static u_int 1664pf_purge_expired_states(u_int i, int maxcheck) 1665{ 1666 struct pf_idhash *ih; 1667 struct pf_state *s; 1668 1669 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1670 1671 /* 1672 * Go through hash and unlink states that expire now. 1673 */ 1674 while (maxcheck > 0) { 1675 1676 ih = &V_pf_idhash[i]; 1677relock: 1678 PF_HASHROW_LOCK(ih); 1679 LIST_FOREACH(s, &ih->states, entry) { 1680 if (pf_state_expires(s) <= time_uptime) { 1681 V_pf_status.states -= 1682 pf_unlink_state(s, PF_ENTER_LOCKED); 1683 goto relock; 1684 } 1685 s->rule.ptr->rule_flag |= PFRULE_REFS; 1686 if (s->nat_rule.ptr != NULL) 1687 s->nat_rule.ptr->rule_flag |= PFRULE_REFS; 1688 if (s->anchor.ptr != NULL) 1689 s->anchor.ptr->rule_flag |= PFRULE_REFS; 1690 s->kif->pfik_flags |= PFI_IFLAG_REFS; 1691 if (s->rt_kif) 1692 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 1693 } 1694 PF_HASHROW_UNLOCK(ih); 1695 1696 /* Return when we hit end of hash. */ 1697 if (++i > pf_hashmask) { 1698 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1699 return (0); 1700 } 1701 1702 maxcheck--; 1703 } 1704 1705 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 1706 1707 return (i); 1708} 1709 1710static void 1711pf_purge_unlinked_rules() 1712{ 1713 struct pf_rulequeue tmpq; 1714 struct pf_rule *r, *r1; 1715 1716 /* 1717 * If we have overloading task pending, then we'd 1718 * better skip purging this time. There is a tiny 1719 * probability that overloading task references 1720 * an already unlinked rule. 1721 */ 1722 PF_OVERLOADQ_LOCK(); 1723 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 1724 PF_OVERLOADQ_UNLOCK(); 1725 return; 1726 } 1727 PF_OVERLOADQ_UNLOCK(); 1728 1729 /* 1730 * Do naive mark-and-sweep garbage collecting of old rules. 1731 * Reference flag is raised by pf_purge_expired_states() 1732 * and pf_purge_expired_src_nodes(). 1733 * 1734 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 1735 * use a temporary queue. 1736 */ 1737 TAILQ_INIT(&tmpq); 1738 PF_UNLNKDRULES_LOCK(); 1739 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 1740 if (!(r->rule_flag & PFRULE_REFS)) { 1741 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 1742 TAILQ_INSERT_TAIL(&tmpq, r, entries); 1743 } else 1744 r->rule_flag &= ~PFRULE_REFS; 1745 } 1746 PF_UNLNKDRULES_UNLOCK(); 1747 1748 if (!TAILQ_EMPTY(&tmpq)) { 1749 PF_RULES_WLOCK(); 1750 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 1751 TAILQ_REMOVE(&tmpq, r, entries); 1752 pf_free_rule(r); 1753 } 1754 PF_RULES_WUNLOCK(); 1755 } 1756} 1757 1758void 1759pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1760{ 1761 switch (af) { 1762#ifdef INET 1763 case AF_INET: { 1764 u_int32_t a = ntohl(addr->addr32[0]); 1765 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1766 (a>>8)&255, a&255); 1767 if (p) { 1768 p = ntohs(p); 1769 printf(":%u", p); 1770 } 1771 break; 1772 } 1773#endif /* INET */ 1774#ifdef INET6 1775 case AF_INET6: { 1776 u_int16_t b; 1777 u_int8_t i, curstart, curend, maxstart, maxend; 1778 curstart = curend = maxstart = maxend = 255; 1779 for (i = 0; i < 8; i++) { 1780 if (!addr->addr16[i]) { 1781 if (curstart == 255) 1782 curstart = i; 1783 curend = i; 1784 } else { 1785 if ((curend - curstart) > 1786 (maxend - maxstart)) { 1787 maxstart = curstart; 1788 maxend = curend; 1789 } 1790 curstart = curend = 255; 1791 } 1792 } 1793 if ((curend - curstart) > 1794 (maxend - maxstart)) { 1795 maxstart = curstart; 1796 maxend = curend; 1797 } 1798 for (i = 0; i < 8; i++) { 1799 if (i >= maxstart && i <= maxend) { 1800 if (i == 0) 1801 printf(":"); 1802 if (i == maxend) 1803 printf(":"); 1804 } else { 1805 b = ntohs(addr->addr16[i]); 1806 printf("%x", b); 1807 if (i < 7) 1808 printf(":"); 1809 } 1810 } 1811 if (p) { 1812 p = ntohs(p); 1813 printf("[%u]", p); 1814 } 1815 break; 1816 } 1817#endif /* INET6 */ 1818 } 1819} 1820 1821void 1822pf_print_state(struct pf_state *s) 1823{ 1824 pf_print_state_parts(s, NULL, NULL); 1825} 1826 1827static void 1828pf_print_state_parts(struct pf_state *s, 1829 struct pf_state_key *skwp, struct pf_state_key *sksp) 1830{ 1831 struct pf_state_key *skw, *sks; 1832 u_int8_t proto, dir; 1833 1834 /* Do our best to fill these, but they're skipped if NULL */ 1835 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 1836 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 1837 proto = skw ? skw->proto : (sks ? sks->proto : 0); 1838 dir = s ? s->direction : 0; 1839 1840 switch (proto) { 1841 case IPPROTO_IPV4: 1842 printf("IPv4"); 1843 break; 1844 case IPPROTO_IPV6: 1845 printf("IPv6"); 1846 break; 1847 case IPPROTO_TCP: 1848 printf("TCP"); 1849 break; 1850 case IPPROTO_UDP: 1851 printf("UDP"); 1852 break; 1853 case IPPROTO_ICMP: 1854 printf("ICMP"); 1855 break; 1856 case IPPROTO_ICMPV6: 1857 printf("ICMPv6"); 1858 break; 1859 default: 1860 printf("%u", skw->proto); 1861 break; 1862 } 1863 switch (dir) { 1864 case PF_IN: 1865 printf(" in"); 1866 break; 1867 case PF_OUT: 1868 printf(" out"); 1869 break; 1870 } 1871 if (skw) { 1872 printf(" wire: "); 1873 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 1874 printf(" "); 1875 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 1876 } 1877 if (sks) { 1878 printf(" stack: "); 1879 if (sks != skw) { 1880 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 1881 printf(" "); 1882 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 1883 } else 1884 printf("-"); 1885 } 1886 if (s) { 1887 if (proto == IPPROTO_TCP) { 1888 printf(" [lo=%u high=%u win=%u modulator=%u", 1889 s->src.seqlo, s->src.seqhi, 1890 s->src.max_win, s->src.seqdiff); 1891 if (s->src.wscale && s->dst.wscale) 1892 printf(" wscale=%u", 1893 s->src.wscale & PF_WSCALE_MASK); 1894 printf("]"); 1895 printf(" [lo=%u high=%u win=%u modulator=%u", 1896 s->dst.seqlo, s->dst.seqhi, 1897 s->dst.max_win, s->dst.seqdiff); 1898 if (s->src.wscale && s->dst.wscale) 1899 printf(" wscale=%u", 1900 s->dst.wscale & PF_WSCALE_MASK); 1901 printf("]"); 1902 } 1903 printf(" %u:%u", s->src.state, s->dst.state); 1904 } 1905} 1906 1907void 1908pf_print_flags(u_int8_t f) 1909{ 1910 if (f) 1911 printf(" "); 1912 if (f & TH_FIN) 1913 printf("F"); 1914 if (f & TH_SYN) 1915 printf("S"); 1916 if (f & TH_RST) 1917 printf("R"); 1918 if (f & TH_PUSH) 1919 printf("P"); 1920 if (f & TH_ACK) 1921 printf("A"); 1922 if (f & TH_URG) 1923 printf("U"); 1924 if (f & TH_ECE) 1925 printf("E"); 1926 if (f & TH_CWR) 1927 printf("W"); 1928} 1929 1930#define PF_SET_SKIP_STEPS(i) \ 1931 do { \ 1932 while (head[i] != cur) { \ 1933 head[i]->skip[i].ptr = cur; \ 1934 head[i] = TAILQ_NEXT(head[i], entries); \ 1935 } \ 1936 } while (0) 1937 1938void 1939pf_calc_skip_steps(struct pf_rulequeue *rules) 1940{ 1941 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1942 int i; 1943 1944 cur = TAILQ_FIRST(rules); 1945 prev = cur; 1946 for (i = 0; i < PF_SKIP_COUNT; ++i) 1947 head[i] = cur; 1948 while (cur != NULL) { 1949 1950 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1951 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1952 if (cur->direction != prev->direction) 1953 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1954 if (cur->af != prev->af) 1955 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1956 if (cur->proto != prev->proto) 1957 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1958 if (cur->src.neg != prev->src.neg || 1959 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1960 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1961 if (cur->src.port[0] != prev->src.port[0] || 1962 cur->src.port[1] != prev->src.port[1] || 1963 cur->src.port_op != prev->src.port_op) 1964 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1965 if (cur->dst.neg != prev->dst.neg || 1966 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1967 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1968 if (cur->dst.port[0] != prev->dst.port[0] || 1969 cur->dst.port[1] != prev->dst.port[1] || 1970 cur->dst.port_op != prev->dst.port_op) 1971 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1972 1973 prev = cur; 1974 cur = TAILQ_NEXT(cur, entries); 1975 } 1976 for (i = 0; i < PF_SKIP_COUNT; ++i) 1977 PF_SET_SKIP_STEPS(i); 1978} 1979 1980static int 1981pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1982{ 1983 if (aw1->type != aw2->type) 1984 return (1); 1985 switch (aw1->type) { 1986 case PF_ADDR_ADDRMASK: 1987 case PF_ADDR_RANGE: 1988 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1989 return (1); 1990 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1991 return (1); 1992 return (0); 1993 case PF_ADDR_DYNIFTL: 1994 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1995 case PF_ADDR_NOROUTE: 1996 case PF_ADDR_URPFFAILED: 1997 return (0); 1998 case PF_ADDR_TABLE: 1999 return (aw1->p.tbl != aw2->p.tbl); 2000 default: 2001 printf("invalid address type: %d\n", aw1->type); 2002 return (1); 2003 } 2004} 2005 2006u_int16_t 2007pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2008{ 2009 u_int32_t l; 2010 2011 if (udp && !cksum) 2012 return (0x0000); 2013 l = cksum + old - new; 2014 l = (l >> 16) + (l & 65535); 2015 l = l & 65535; 2016 if (udp && !l) 2017 return (0xFFFF); 2018 return (l); 2019} 2020 2021static void 2022pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 2023 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 2024{ 2025 struct pf_addr ao; 2026 u_int16_t po = *p; 2027 2028 PF_ACPY(&ao, a, af); 2029 PF_ACPY(a, an, af); 2030 2031 *p = pn; 2032 2033 switch (af) { 2034#ifdef INET 2035 case AF_INET: 2036 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2037 ao.addr16[0], an->addr16[0], 0), 2038 ao.addr16[1], an->addr16[1], 0); 2039 *p = pn; 2040 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2041 ao.addr16[0], an->addr16[0], u), 2042 ao.addr16[1], an->addr16[1], u), 2043 po, pn, u); 2044 break; 2045#endif /* INET */ 2046#ifdef INET6 2047 case AF_INET6: 2048 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2049 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2050 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 2051 ao.addr16[0], an->addr16[0], u), 2052 ao.addr16[1], an->addr16[1], u), 2053 ao.addr16[2], an->addr16[2], u), 2054 ao.addr16[3], an->addr16[3], u), 2055 ao.addr16[4], an->addr16[4], u), 2056 ao.addr16[5], an->addr16[5], u), 2057 ao.addr16[6], an->addr16[6], u), 2058 ao.addr16[7], an->addr16[7], u), 2059 po, pn, u); 2060 break; 2061#endif /* INET6 */ 2062 } 2063} 2064 2065 2066/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2067void 2068pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2069{ 2070 u_int32_t ao; 2071 2072 memcpy(&ao, a, sizeof(ao)); 2073 memcpy(a, &an, sizeof(u_int32_t)); 2074 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2075 ao % 65536, an % 65536, u); 2076} 2077 2078#ifdef INET6 2079static void 2080pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2081{ 2082 struct pf_addr ao; 2083 2084 PF_ACPY(&ao, a, AF_INET6); 2085 PF_ACPY(a, an, AF_INET6); 2086 2087 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2088 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2089 pf_cksum_fixup(pf_cksum_fixup(*c, 2090 ao.addr16[0], an->addr16[0], u), 2091 ao.addr16[1], an->addr16[1], u), 2092 ao.addr16[2], an->addr16[2], u), 2093 ao.addr16[3], an->addr16[3], u), 2094 ao.addr16[4], an->addr16[4], u), 2095 ao.addr16[5], an->addr16[5], u), 2096 ao.addr16[6], an->addr16[6], u), 2097 ao.addr16[7], an->addr16[7], u); 2098} 2099#endif /* INET6 */ 2100 2101static void 2102pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2103 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2104 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2105{ 2106 struct pf_addr oia, ooa; 2107 2108 PF_ACPY(&oia, ia, af); 2109 if (oa) 2110 PF_ACPY(&ooa, oa, af); 2111 2112 /* Change inner protocol port, fix inner protocol checksum. */ 2113 if (ip != NULL) { 2114 u_int16_t oip = *ip; 2115 u_int32_t opc; 2116 2117 if (pc != NULL) 2118 opc = *pc; 2119 *ip = np; 2120 if (pc != NULL) 2121 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2122 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2123 if (pc != NULL) 2124 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2125 } 2126 /* Change inner ip address, fix inner ip and icmp checksums. */ 2127 PF_ACPY(ia, na, af); 2128 switch (af) { 2129#ifdef INET 2130 case AF_INET: { 2131 u_int32_t oh2c = *h2c; 2132 2133 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2134 oia.addr16[0], ia->addr16[0], 0), 2135 oia.addr16[1], ia->addr16[1], 0); 2136 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2137 oia.addr16[0], ia->addr16[0], 0), 2138 oia.addr16[1], ia->addr16[1], 0); 2139 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2140 break; 2141 } 2142#endif /* INET */ 2143#ifdef INET6 2144 case AF_INET6: 2145 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2146 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2147 pf_cksum_fixup(pf_cksum_fixup(*ic, 2148 oia.addr16[0], ia->addr16[0], u), 2149 oia.addr16[1], ia->addr16[1], u), 2150 oia.addr16[2], ia->addr16[2], u), 2151 oia.addr16[3], ia->addr16[3], u), 2152 oia.addr16[4], ia->addr16[4], u), 2153 oia.addr16[5], ia->addr16[5], u), 2154 oia.addr16[6], ia->addr16[6], u), 2155 oia.addr16[7], ia->addr16[7], u); 2156 break; 2157#endif /* INET6 */ 2158 } 2159 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2160 if (oa) { 2161 PF_ACPY(oa, na, af); 2162 switch (af) { 2163#ifdef INET 2164 case AF_INET: 2165 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2166 ooa.addr16[0], oa->addr16[0], 0), 2167 ooa.addr16[1], oa->addr16[1], 0); 2168 break; 2169#endif /* INET */ 2170#ifdef INET6 2171 case AF_INET6: 2172 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2173 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2174 pf_cksum_fixup(pf_cksum_fixup(*ic, 2175 ooa.addr16[0], oa->addr16[0], u), 2176 ooa.addr16[1], oa->addr16[1], u), 2177 ooa.addr16[2], oa->addr16[2], u), 2178 ooa.addr16[3], oa->addr16[3], u), 2179 ooa.addr16[4], oa->addr16[4], u), 2180 ooa.addr16[5], oa->addr16[5], u), 2181 ooa.addr16[6], oa->addr16[6], u), 2182 ooa.addr16[7], oa->addr16[7], u); 2183 break; 2184#endif /* INET6 */ 2185 } 2186 } 2187} 2188 2189 2190/* 2191 * Need to modulate the sequence numbers in the TCP SACK option 2192 * (credits to Krzysztof Pfaff for report and patch) 2193 */ 2194static int 2195pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2196 struct tcphdr *th, struct pf_state_peer *dst) 2197{ 2198 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2199 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2200 int copyback = 0, i, olen; 2201 struct sackblk sack; 2202 2203#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2204 if (hlen < TCPOLEN_SACKLEN || 2205 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2206 return 0; 2207 2208 while (hlen >= TCPOLEN_SACKLEN) { 2209 olen = opt[1]; 2210 switch (*opt) { 2211 case TCPOPT_EOL: /* FALLTHROUGH */ 2212 case TCPOPT_NOP: 2213 opt++; 2214 hlen--; 2215 break; 2216 case TCPOPT_SACK: 2217 if (olen > hlen) 2218 olen = hlen; 2219 if (olen >= TCPOLEN_SACKLEN) { 2220 for (i = 2; i + TCPOLEN_SACK <= olen; 2221 i += TCPOLEN_SACK) { 2222 memcpy(&sack, &opt[i], sizeof(sack)); 2223 pf_change_a(&sack.start, &th->th_sum, 2224 htonl(ntohl(sack.start) - 2225 dst->seqdiff), 0); 2226 pf_change_a(&sack.end, &th->th_sum, 2227 htonl(ntohl(sack.end) - 2228 dst->seqdiff), 0); 2229 memcpy(&opt[i], &sack, sizeof(sack)); 2230 } 2231 copyback = 1; 2232 } 2233 /* FALLTHROUGH */ 2234 default: 2235 if (olen < 2) 2236 olen = 2; 2237 hlen -= olen; 2238 opt += olen; 2239 } 2240 } 2241 2242 if (copyback) 2243 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2244 return (copyback); 2245} 2246 2247static void 2248pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 2249 const struct pf_addr *saddr, const struct pf_addr *daddr, 2250 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2251 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2252 u_int16_t rtag, struct ifnet *ifp) 2253{ 2254 struct pf_send_entry *pfse; 2255 struct mbuf *m; 2256 int len, tlen; 2257#ifdef INET 2258 struct ip *h = NULL; 2259#endif /* INET */ 2260#ifdef INET6 2261 struct ip6_hdr *h6 = NULL; 2262#endif /* INET6 */ 2263 struct tcphdr *th; 2264 char *opt; 2265 struct pf_mtag *pf_mtag; 2266 2267 len = 0; 2268 th = NULL; 2269 2270 /* maximum segment size tcp option */ 2271 tlen = sizeof(struct tcphdr); 2272 if (mss) 2273 tlen += 4; 2274 2275 switch (af) { 2276#ifdef INET 2277 case AF_INET: 2278 len = sizeof(struct ip) + tlen; 2279 break; 2280#endif /* INET */ 2281#ifdef INET6 2282 case AF_INET6: 2283 len = sizeof(struct ip6_hdr) + tlen; 2284 break; 2285#endif /* INET6 */ 2286 default: 2287 panic("%s: unsupported af %d", __func__, af); 2288 } 2289 2290 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2291 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2292 if (pfse == NULL) 2293 return; 2294 m = m_gethdr(M_NOWAIT, MT_DATA); 2295 if (m == NULL) { 2296 free(pfse, M_PFTEMP); 2297 return; 2298 } 2299#ifdef MAC 2300 mac_netinet_firewall_send(m); 2301#endif 2302 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2303 free(pfse, M_PFTEMP); 2304 m_freem(m); 2305 return; 2306 } 2307 if (tag) 2308 m->m_flags |= M_SKIP_FIREWALL; 2309 pf_mtag->tag = rtag; 2310 2311 if (r != NULL && r->rtableid >= 0) 2312 M_SETFIB(m, r->rtableid); 2313 2314#ifdef ALTQ 2315 if (r != NULL && r->qid) { 2316 pf_mtag->qid = r->qid; 2317 2318 /* add hints for ecn */ 2319 pf_mtag->hdr = mtod(m, struct ip *); 2320 } 2321#endif /* ALTQ */ 2322 m->m_data += max_linkhdr; 2323 m->m_pkthdr.len = m->m_len = len; 2324 m->m_pkthdr.rcvif = NULL; 2325 bzero(m->m_data, len); 2326 switch (af) { 2327#ifdef INET 2328 case AF_INET: 2329 h = mtod(m, struct ip *); 2330 2331 /* IP header fields included in the TCP checksum */ 2332 h->ip_p = IPPROTO_TCP; 2333 h->ip_len = htons(tlen); 2334 h->ip_src.s_addr = saddr->v4.s_addr; 2335 h->ip_dst.s_addr = daddr->v4.s_addr; 2336 2337 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2338 break; 2339#endif /* INET */ 2340#ifdef INET6 2341 case AF_INET6: 2342 h6 = mtod(m, struct ip6_hdr *); 2343 2344 /* IP header fields included in the TCP checksum */ 2345 h6->ip6_nxt = IPPROTO_TCP; 2346 h6->ip6_plen = htons(tlen); 2347 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2348 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2349 2350 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2351 break; 2352#endif /* INET6 */ 2353 } 2354 2355 /* TCP header */ 2356 th->th_sport = sport; 2357 th->th_dport = dport; 2358 th->th_seq = htonl(seq); 2359 th->th_ack = htonl(ack); 2360 th->th_off = tlen >> 2; 2361 th->th_flags = flags; 2362 th->th_win = htons(win); 2363 2364 if (mss) { 2365 opt = (char *)(th + 1); 2366 opt[0] = TCPOPT_MAXSEG; 2367 opt[1] = 4; 2368 HTONS(mss); 2369 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2370 } 2371 2372 switch (af) { 2373#ifdef INET 2374 case AF_INET: 2375 /* TCP checksum */ 2376 th->th_sum = in_cksum(m, len); 2377 2378 /* Finish the IP header */ 2379 h->ip_v = 4; 2380 h->ip_hl = sizeof(*h) >> 2; 2381 h->ip_tos = IPTOS_LOWDELAY; 2382 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2383 h->ip_len = htons(len); 2384 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2385 h->ip_sum = 0; 2386 2387 pfse->pfse_type = PFSE_IP; 2388 break; 2389#endif /* INET */ 2390#ifdef INET6 2391 case AF_INET6: 2392 /* TCP checksum */ 2393 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2394 sizeof(struct ip6_hdr), tlen); 2395 2396 h6->ip6_vfc |= IPV6_VERSION; 2397 h6->ip6_hlim = IPV6_DEFHLIM; 2398 2399 pfse->pfse_type = PFSE_IP6; 2400 break; 2401#endif /* INET6 */ 2402 } 2403 pfse->pfse_m = m; 2404 pf_send(pfse); 2405} 2406 2407static void 2408pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2409 struct pf_rule *r) 2410{ 2411 struct pf_send_entry *pfse; 2412 struct mbuf *m0; 2413 struct pf_mtag *pf_mtag; 2414 2415 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2416 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2417 if (pfse == NULL) 2418 return; 2419 2420 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 2421 free(pfse, M_PFTEMP); 2422 return; 2423 } 2424 2425 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 2426 free(pfse, M_PFTEMP); 2427 return; 2428 } 2429 /* XXX: revisit */ 2430 m0->m_flags |= M_SKIP_FIREWALL; 2431 2432 if (r->rtableid >= 0) 2433 M_SETFIB(m0, r->rtableid); 2434 2435#ifdef ALTQ 2436 if (r->qid) { 2437 pf_mtag->qid = r->qid; 2438 /* add hints for ecn */ 2439 pf_mtag->hdr = mtod(m0, struct ip *); 2440 } 2441#endif /* ALTQ */ 2442 2443 switch (af) { 2444#ifdef INET 2445 case AF_INET: 2446 pfse->pfse_type = PFSE_ICMP; 2447 break; 2448#endif /* INET */ 2449#ifdef INET6 2450 case AF_INET6: 2451 pfse->pfse_type = PFSE_ICMP6; 2452 break; 2453#endif /* INET6 */ 2454 } 2455 pfse->pfse_m = m0; 2456 pfse->pfse_icmp_type = type; 2457 pfse->pfse_icmp_code = code; 2458 pf_send(pfse); 2459} 2460 2461/* 2462 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2463 * If n is 0, they match if they are equal. If n is != 0, they match if they 2464 * are different. 2465 */ 2466int 2467pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2468 struct pf_addr *b, sa_family_t af) 2469{ 2470 int match = 0; 2471 2472 switch (af) { 2473#ifdef INET 2474 case AF_INET: 2475 if ((a->addr32[0] & m->addr32[0]) == 2476 (b->addr32[0] & m->addr32[0])) 2477 match++; 2478 break; 2479#endif /* INET */ 2480#ifdef INET6 2481 case AF_INET6: 2482 if (((a->addr32[0] & m->addr32[0]) == 2483 (b->addr32[0] & m->addr32[0])) && 2484 ((a->addr32[1] & m->addr32[1]) == 2485 (b->addr32[1] & m->addr32[1])) && 2486 ((a->addr32[2] & m->addr32[2]) == 2487 (b->addr32[2] & m->addr32[2])) && 2488 ((a->addr32[3] & m->addr32[3]) == 2489 (b->addr32[3] & m->addr32[3]))) 2490 match++; 2491 break; 2492#endif /* INET6 */ 2493 } 2494 if (match) { 2495 if (n) 2496 return (0); 2497 else 2498 return (1); 2499 } else { 2500 if (n) 2501 return (1); 2502 else 2503 return (0); 2504 } 2505} 2506 2507/* 2508 * Return 1 if b <= a <= e, otherwise return 0. 2509 */ 2510int 2511pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 2512 struct pf_addr *a, sa_family_t af) 2513{ 2514 switch (af) { 2515#ifdef INET 2516 case AF_INET: 2517 if ((a->addr32[0] < b->addr32[0]) || 2518 (a->addr32[0] > e->addr32[0])) 2519 return (0); 2520 break; 2521#endif /* INET */ 2522#ifdef INET6 2523 case AF_INET6: { 2524 int i; 2525 2526 /* check a >= b */ 2527 for (i = 0; i < 4; ++i) 2528 if (a->addr32[i] > b->addr32[i]) 2529 break; 2530 else if (a->addr32[i] < b->addr32[i]) 2531 return (0); 2532 /* check a <= e */ 2533 for (i = 0; i < 4; ++i) 2534 if (a->addr32[i] < e->addr32[i]) 2535 break; 2536 else if (a->addr32[i] > e->addr32[i]) 2537 return (0); 2538 break; 2539 } 2540#endif /* INET6 */ 2541 } 2542 return (1); 2543} 2544 2545static int 2546pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2547{ 2548 switch (op) { 2549 case PF_OP_IRG: 2550 return ((p > a1) && (p < a2)); 2551 case PF_OP_XRG: 2552 return ((p < a1) || (p > a2)); 2553 case PF_OP_RRG: 2554 return ((p >= a1) && (p <= a2)); 2555 case PF_OP_EQ: 2556 return (p == a1); 2557 case PF_OP_NE: 2558 return (p != a1); 2559 case PF_OP_LT: 2560 return (p < a1); 2561 case PF_OP_LE: 2562 return (p <= a1); 2563 case PF_OP_GT: 2564 return (p > a1); 2565 case PF_OP_GE: 2566 return (p >= a1); 2567 } 2568 return (0); /* never reached */ 2569} 2570 2571int 2572pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2573{ 2574 NTOHS(a1); 2575 NTOHS(a2); 2576 NTOHS(p); 2577 return (pf_match(op, a1, a2, p)); 2578} 2579 2580static int 2581pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2582{ 2583 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2584 return (0); 2585 return (pf_match(op, a1, a2, u)); 2586} 2587 2588static int 2589pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2590{ 2591 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2592 return (0); 2593 return (pf_match(op, a1, a2, g)); 2594} 2595 2596int 2597pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag) 2598{ 2599 if (*tag == -1) 2600 *tag = mtag; 2601 2602 return ((!r->match_tag_not && r->match_tag == *tag) || 2603 (r->match_tag_not && r->match_tag != *tag)); 2604} 2605 2606int 2607pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 2608{ 2609 2610 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 2611 2612 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 2613 return (ENOMEM); 2614 2615 pd->pf_mtag->tag = tag; 2616 2617 return (0); 2618} 2619 2620#define PF_ANCHOR_STACKSIZE 32 2621struct pf_anchor_stackframe { 2622 struct pf_ruleset *rs; 2623 struct pf_rule *r; /* XXX: + match bit */ 2624 struct pf_anchor *child; 2625}; 2626 2627/* 2628 * XXX: We rely on malloc(9) returning pointer aligned addresses. 2629 */ 2630#define PF_ANCHORSTACK_MATCH 0x00000001 2631#define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 2632 2633#define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 2634#define PF_ANCHOR_RULE(f) (struct pf_rule *) \ 2635 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 2636#define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 2637 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 2638} while (0) 2639 2640void 2641pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth, 2642 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2643 int *match) 2644{ 2645 struct pf_anchor_stackframe *f; 2646 2647 PF_RULES_RASSERT(); 2648 2649 if (match) 2650 *match = 0; 2651 if (*depth >= PF_ANCHOR_STACKSIZE) { 2652 printf("%s: anchor stack overflow on %s\n", 2653 __func__, (*r)->anchor->name); 2654 *r = TAILQ_NEXT(*r, entries); 2655 return; 2656 } else if (*depth == 0 && a != NULL) 2657 *a = *r; 2658 f = stack + (*depth)++; 2659 f->rs = *rs; 2660 f->r = *r; 2661 if ((*r)->anchor_wildcard) { 2662 struct pf_anchor_node *parent = &(*r)->anchor->children; 2663 2664 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) { 2665 *r = NULL; 2666 return; 2667 } 2668 *rs = &f->child->ruleset; 2669 } else { 2670 f->child = NULL; 2671 *rs = &(*r)->anchor->ruleset; 2672 } 2673 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2674} 2675 2676int 2677pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth, 2678 struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, 2679 int *match) 2680{ 2681 struct pf_anchor_stackframe *f; 2682 struct pf_rule *fr; 2683 int quick = 0; 2684 2685 PF_RULES_RASSERT(); 2686 2687 do { 2688 if (*depth <= 0) 2689 break; 2690 f = stack + *depth - 1; 2691 fr = PF_ANCHOR_RULE(f); 2692 if (f->child != NULL) { 2693 struct pf_anchor_node *parent; 2694 2695 /* 2696 * This block traverses through 2697 * a wildcard anchor. 2698 */ 2699 parent = &fr->anchor->children; 2700 if (match != NULL && *match) { 2701 /* 2702 * If any of "*" matched, then 2703 * "foo/ *" matched, mark frame 2704 * appropriately. 2705 */ 2706 PF_ANCHOR_SET_MATCH(f); 2707 *match = 0; 2708 } 2709 f->child = RB_NEXT(pf_anchor_node, parent, f->child); 2710 if (f->child != NULL) { 2711 *rs = &f->child->ruleset; 2712 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2713 if (*r == NULL) 2714 continue; 2715 else 2716 break; 2717 } 2718 } 2719 (*depth)--; 2720 if (*depth == 0 && a != NULL) 2721 *a = NULL; 2722 *rs = f->rs; 2723 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 2724 quick = fr->quick; 2725 *r = TAILQ_NEXT(fr, entries); 2726 } while (*r == NULL); 2727 2728 return (quick); 2729} 2730 2731#ifdef INET6 2732void 2733pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2734 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2735{ 2736 switch (af) { 2737#ifdef INET 2738 case AF_INET: 2739 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2740 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2741 break; 2742#endif /* INET */ 2743 case AF_INET6: 2744 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2745 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2746 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2747 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2748 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2749 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2750 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2751 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2752 break; 2753 } 2754} 2755 2756void 2757pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2758{ 2759 switch (af) { 2760#ifdef INET 2761 case AF_INET: 2762 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2763 break; 2764#endif /* INET */ 2765 case AF_INET6: 2766 if (addr->addr32[3] == 0xffffffff) { 2767 addr->addr32[3] = 0; 2768 if (addr->addr32[2] == 0xffffffff) { 2769 addr->addr32[2] = 0; 2770 if (addr->addr32[1] == 0xffffffff) { 2771 addr->addr32[1] = 0; 2772 addr->addr32[0] = 2773 htonl(ntohl(addr->addr32[0]) + 1); 2774 } else 2775 addr->addr32[1] = 2776 htonl(ntohl(addr->addr32[1]) + 1); 2777 } else 2778 addr->addr32[2] = 2779 htonl(ntohl(addr->addr32[2]) + 1); 2780 } else 2781 addr->addr32[3] = 2782 htonl(ntohl(addr->addr32[3]) + 1); 2783 break; 2784 } 2785} 2786#endif /* INET6 */ 2787 2788int 2789pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 2790{ 2791 struct pf_addr *saddr, *daddr; 2792 u_int16_t sport, dport; 2793 struct inpcbinfo *pi; 2794 struct inpcb *inp; 2795 2796 pd->lookup.uid = UID_MAX; 2797 pd->lookup.gid = GID_MAX; 2798 2799 switch (pd->proto) { 2800 case IPPROTO_TCP: 2801 if (pd->hdr.tcp == NULL) 2802 return (-1); 2803 sport = pd->hdr.tcp->th_sport; 2804 dport = pd->hdr.tcp->th_dport; 2805 pi = &V_tcbinfo; 2806 break; 2807 case IPPROTO_UDP: 2808 if (pd->hdr.udp == NULL) 2809 return (-1); 2810 sport = pd->hdr.udp->uh_sport; 2811 dport = pd->hdr.udp->uh_dport; 2812 pi = &V_udbinfo; 2813 break; 2814 default: 2815 return (-1); 2816 } 2817 if (direction == PF_IN) { 2818 saddr = pd->src; 2819 daddr = pd->dst; 2820 } else { 2821 u_int16_t p; 2822 2823 p = sport; 2824 sport = dport; 2825 dport = p; 2826 saddr = pd->dst; 2827 daddr = pd->src; 2828 } 2829 switch (pd->af) { 2830#ifdef INET 2831 case AF_INET: 2832 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 2833 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2834 if (inp == NULL) { 2835 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 2836 daddr->v4, dport, INPLOOKUP_WILDCARD | 2837 INPLOOKUP_RLOCKPCB, NULL, m); 2838 if (inp == NULL) 2839 return (-1); 2840 } 2841 break; 2842#endif /* INET */ 2843#ifdef INET6 2844 case AF_INET6: 2845 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 2846 dport, INPLOOKUP_RLOCKPCB, NULL, m); 2847 if (inp == NULL) { 2848 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 2849 &daddr->v6, dport, INPLOOKUP_WILDCARD | 2850 INPLOOKUP_RLOCKPCB, NULL, m); 2851 if (inp == NULL) 2852 return (-1); 2853 } 2854 break; 2855#endif /* INET6 */ 2856 2857 default: 2858 return (-1); 2859 } 2860 INP_RLOCK_ASSERT(inp); 2861 pd->lookup.uid = inp->inp_cred->cr_uid; 2862 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 2863 INP_RUNLOCK(inp); 2864 2865 return (1); 2866} 2867 2868static u_int8_t 2869pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2870{ 2871 int hlen; 2872 u_int8_t hdr[60]; 2873 u_int8_t *opt, optlen; 2874 u_int8_t wscale = 0; 2875 2876 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2877 if (hlen <= sizeof(struct tcphdr)) 2878 return (0); 2879 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2880 return (0); 2881 opt = hdr + sizeof(struct tcphdr); 2882 hlen -= sizeof(struct tcphdr); 2883 while (hlen >= 3) { 2884 switch (*opt) { 2885 case TCPOPT_EOL: 2886 case TCPOPT_NOP: 2887 ++opt; 2888 --hlen; 2889 break; 2890 case TCPOPT_WINDOW: 2891 wscale = opt[2]; 2892 if (wscale > TCP_MAX_WINSHIFT) 2893 wscale = TCP_MAX_WINSHIFT; 2894 wscale |= PF_WSCALE_FLAG; 2895 /* FALLTHROUGH */ 2896 default: 2897 optlen = opt[1]; 2898 if (optlen < 2) 2899 optlen = 2; 2900 hlen -= optlen; 2901 opt += optlen; 2902 break; 2903 } 2904 } 2905 return (wscale); 2906} 2907 2908static u_int16_t 2909pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 2910{ 2911 int hlen; 2912 u_int8_t hdr[60]; 2913 u_int8_t *opt, optlen; 2914 u_int16_t mss = V_tcp_mssdflt; 2915 2916 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 2917 if (hlen <= sizeof(struct tcphdr)) 2918 return (0); 2919 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 2920 return (0); 2921 opt = hdr + sizeof(struct tcphdr); 2922 hlen -= sizeof(struct tcphdr); 2923 while (hlen >= TCPOLEN_MAXSEG) { 2924 switch (*opt) { 2925 case TCPOPT_EOL: 2926 case TCPOPT_NOP: 2927 ++opt; 2928 --hlen; 2929 break; 2930 case TCPOPT_MAXSEG: 2931 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 2932 NTOHS(mss); 2933 /* FALLTHROUGH */ 2934 default: 2935 optlen = opt[1]; 2936 if (optlen < 2) 2937 optlen = 2; 2938 hlen -= optlen; 2939 opt += optlen; 2940 break; 2941 } 2942 } 2943 return (mss); 2944} 2945 2946static u_int16_t 2947pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 2948{ 2949#ifdef INET 2950 struct sockaddr_in *dst; 2951 struct route ro; 2952#endif /* INET */ 2953#ifdef INET6 2954 struct sockaddr_in6 *dst6; 2955 struct route_in6 ro6; 2956#endif /* INET6 */ 2957 struct rtentry *rt = NULL; 2958 int hlen = 0; 2959 u_int16_t mss = V_tcp_mssdflt; 2960 2961 switch (af) { 2962#ifdef INET 2963 case AF_INET: 2964 hlen = sizeof(struct ip); 2965 bzero(&ro, sizeof(ro)); 2966 dst = (struct sockaddr_in *)&ro.ro_dst; 2967 dst->sin_family = AF_INET; 2968 dst->sin_len = sizeof(*dst); 2969 dst->sin_addr = addr->v4; 2970 in_rtalloc_ign(&ro, 0, rtableid); 2971 rt = ro.ro_rt; 2972 break; 2973#endif /* INET */ 2974#ifdef INET6 2975 case AF_INET6: 2976 hlen = sizeof(struct ip6_hdr); 2977 bzero(&ro6, sizeof(ro6)); 2978 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 2979 dst6->sin6_family = AF_INET6; 2980 dst6->sin6_len = sizeof(*dst6); 2981 dst6->sin6_addr = addr->v6; 2982 in6_rtalloc_ign(&ro6, 0, rtableid); 2983 rt = ro6.ro_rt; 2984 break; 2985#endif /* INET6 */ 2986 } 2987 2988 if (rt && rt->rt_ifp) { 2989 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 2990 mss = max(V_tcp_mssdflt, mss); 2991 RTFREE(rt); 2992 } 2993 mss = min(mss, offer); 2994 mss = max(mss, 64); /* sanity - at least max opt space */ 2995 return (mss); 2996} 2997 2998static u_int32_t 2999pf_tcp_iss(struct pf_pdesc *pd) 3000{ 3001 MD5_CTX ctx; 3002 u_int32_t digest[4]; 3003 3004 if (V_pf_tcp_secret_init == 0) { 3005 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 3006 MD5Init(&V_pf_tcp_secret_ctx); 3007 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 3008 sizeof(V_pf_tcp_secret)); 3009 V_pf_tcp_secret_init = 1; 3010 } 3011 3012 ctx = V_pf_tcp_secret_ctx; 3013 3014 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); 3015 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); 3016 if (pd->af == AF_INET6) { 3017 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3018 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3019 } else { 3020 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3021 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3022 } 3023 MD5Final((u_char *)digest, &ctx); 3024 V_pf_tcp_iss_off += 4096; 3025#define ISN_RANDOM_INCREMENT (4096 - 1) 3026 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 3027 V_pf_tcp_iss_off); 3028#undef ISN_RANDOM_INCREMENT 3029} 3030 3031static int 3032pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, 3033 struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 3034 struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp) 3035{ 3036 struct pf_rule *nr = NULL; 3037 struct pf_addr * const saddr = pd->src; 3038 struct pf_addr * const daddr = pd->dst; 3039 sa_family_t af = pd->af; 3040 struct pf_rule *r, *a = NULL; 3041 struct pf_ruleset *ruleset = NULL; 3042 struct pf_src_node *nsn = NULL; 3043 struct tcphdr *th = pd->hdr.tcp; 3044 struct pf_state_key *sk = NULL, *nk = NULL; 3045 u_short reason; 3046 int rewrite = 0, hdrlen = 0; 3047 int tag = -1, rtableid = -1; 3048 int asd = 0; 3049 int match = 0; 3050 int state_icmp = 0; 3051 u_int16_t sport = 0, dport = 0; 3052 u_int16_t bproto_sum = 0, bip_sum = 0; 3053 u_int8_t icmptype = 0, icmpcode = 0; 3054 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3055 3056 PF_RULES_RASSERT(); 3057 3058 if (inp != NULL) { 3059 INP_LOCK_ASSERT(inp); 3060 pd->lookup.uid = inp->inp_cred->cr_uid; 3061 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3062 pd->lookup.done = 1; 3063 } 3064 3065 switch (pd->proto) { 3066 case IPPROTO_TCP: 3067 sport = th->th_sport; 3068 dport = th->th_dport; 3069 hdrlen = sizeof(*th); 3070 break; 3071 case IPPROTO_UDP: 3072 sport = pd->hdr.udp->uh_sport; 3073 dport = pd->hdr.udp->uh_dport; 3074 hdrlen = sizeof(*pd->hdr.udp); 3075 break; 3076#ifdef INET 3077 case IPPROTO_ICMP: 3078 if (pd->af != AF_INET) 3079 break; 3080 sport = dport = pd->hdr.icmp->icmp_id; 3081 hdrlen = sizeof(*pd->hdr.icmp); 3082 icmptype = pd->hdr.icmp->icmp_type; 3083 icmpcode = pd->hdr.icmp->icmp_code; 3084 3085 if (icmptype == ICMP_UNREACH || 3086 icmptype == ICMP_SOURCEQUENCH || 3087 icmptype == ICMP_REDIRECT || 3088 icmptype == ICMP_TIMXCEED || 3089 icmptype == ICMP_PARAMPROB) 3090 state_icmp++; 3091 break; 3092#endif /* INET */ 3093#ifdef INET6 3094 case IPPROTO_ICMPV6: 3095 if (af != AF_INET6) 3096 break; 3097 sport = dport = pd->hdr.icmp6->icmp6_id; 3098 hdrlen = sizeof(*pd->hdr.icmp6); 3099 icmptype = pd->hdr.icmp6->icmp6_type; 3100 icmpcode = pd->hdr.icmp6->icmp6_code; 3101 3102 if (icmptype == ICMP6_DST_UNREACH || 3103 icmptype == ICMP6_PACKET_TOO_BIG || 3104 icmptype == ICMP6_TIME_EXCEEDED || 3105 icmptype == ICMP6_PARAM_PROB) 3106 state_icmp++; 3107 break; 3108#endif /* INET6 */ 3109 default: 3110 sport = dport = hdrlen = 0; 3111 break; 3112 } 3113 3114 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3115 3116 /* check packet for BINAT/NAT/RDR */ 3117 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3118 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3119 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3120 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3121 3122 if (pd->ip_sum) 3123 bip_sum = *pd->ip_sum; 3124 3125 switch (pd->proto) { 3126 case IPPROTO_TCP: 3127 bproto_sum = th->th_sum; 3128 pd->proto_sum = &th->th_sum; 3129 3130 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3131 nk->port[pd->sidx] != sport) { 3132 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3133 &th->th_sum, &nk->addr[pd->sidx], 3134 nk->port[pd->sidx], 0, af); 3135 pd->sport = &th->th_sport; 3136 sport = th->th_sport; 3137 } 3138 3139 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3140 nk->port[pd->didx] != dport) { 3141 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3142 &th->th_sum, &nk->addr[pd->didx], 3143 nk->port[pd->didx], 0, af); 3144 dport = th->th_dport; 3145 pd->dport = &th->th_dport; 3146 } 3147 rewrite++; 3148 break; 3149 case IPPROTO_UDP: 3150 bproto_sum = pd->hdr.udp->uh_sum; 3151 pd->proto_sum = &pd->hdr.udp->uh_sum; 3152 3153 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3154 nk->port[pd->sidx] != sport) { 3155 pf_change_ap(saddr, &pd->hdr.udp->uh_sport, 3156 pd->ip_sum, &pd->hdr.udp->uh_sum, 3157 &nk->addr[pd->sidx], 3158 nk->port[pd->sidx], 1, af); 3159 sport = pd->hdr.udp->uh_sport; 3160 pd->sport = &pd->hdr.udp->uh_sport; 3161 } 3162 3163 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3164 nk->port[pd->didx] != dport) { 3165 pf_change_ap(daddr, &pd->hdr.udp->uh_dport, 3166 pd->ip_sum, &pd->hdr.udp->uh_sum, 3167 &nk->addr[pd->didx], 3168 nk->port[pd->didx], 1, af); 3169 dport = pd->hdr.udp->uh_dport; 3170 pd->dport = &pd->hdr.udp->uh_dport; 3171 } 3172 rewrite++; 3173 break; 3174#ifdef INET 3175 case IPPROTO_ICMP: 3176 nk->port[0] = nk->port[1]; 3177 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3178 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3179 nk->addr[pd->sidx].v4.s_addr, 0); 3180 3181 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3182 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3183 nk->addr[pd->didx].v4.s_addr, 0); 3184 3185 if (nk->port[1] != pd->hdr.icmp->icmp_id) { 3186 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 3187 pd->hdr.icmp->icmp_cksum, sport, 3188 nk->port[1], 0); 3189 pd->hdr.icmp->icmp_id = nk->port[1]; 3190 pd->sport = &pd->hdr.icmp->icmp_id; 3191 } 3192 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 3193 break; 3194#endif /* INET */ 3195#ifdef INET6 3196 case IPPROTO_ICMPV6: 3197 nk->port[0] = nk->port[1]; 3198 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3199 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 3200 &nk->addr[pd->sidx], 0); 3201 3202 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3203 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 3204 &nk->addr[pd->didx], 0); 3205 rewrite++; 3206 break; 3207#endif /* INET */ 3208 default: 3209 switch (af) { 3210#ifdef INET 3211 case AF_INET: 3212 if (PF_ANEQ(saddr, 3213 &nk->addr[pd->sidx], AF_INET)) 3214 pf_change_a(&saddr->v4.s_addr, 3215 pd->ip_sum, 3216 nk->addr[pd->sidx].v4.s_addr, 0); 3217 3218 if (PF_ANEQ(daddr, 3219 &nk->addr[pd->didx], AF_INET)) 3220 pf_change_a(&daddr->v4.s_addr, 3221 pd->ip_sum, 3222 nk->addr[pd->didx].v4.s_addr, 0); 3223 break; 3224#endif /* INET */ 3225#ifdef INET6 3226 case AF_INET6: 3227 if (PF_ANEQ(saddr, 3228 &nk->addr[pd->sidx], AF_INET6)) 3229 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3230 3231 if (PF_ANEQ(daddr, 3232 &nk->addr[pd->didx], AF_INET6)) 3233 PF_ACPY(saddr, &nk->addr[pd->didx], af); 3234 break; 3235#endif /* INET */ 3236 } 3237 break; 3238 } 3239 if (nr->natpass) 3240 r = NULL; 3241 pd->nat_rule = nr; 3242 } 3243 3244 while (r != NULL) { 3245 r->evaluations++; 3246 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3247 r = r->skip[PF_SKIP_IFP].ptr; 3248 else if (r->direction && r->direction != direction) 3249 r = r->skip[PF_SKIP_DIR].ptr; 3250 else if (r->af && r->af != af) 3251 r = r->skip[PF_SKIP_AF].ptr; 3252 else if (r->proto && r->proto != pd->proto) 3253 r = r->skip[PF_SKIP_PROTO].ptr; 3254 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3255 r->src.neg, kif, M_GETFIB(m))) 3256 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3257 /* tcp/udp only. port_op always 0 in other cases */ 3258 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3259 r->src.port[0], r->src.port[1], sport)) 3260 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3261 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3262 r->dst.neg, NULL, M_GETFIB(m))) 3263 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3264 /* tcp/udp only. port_op always 0 in other cases */ 3265 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3266 r->dst.port[0], r->dst.port[1], dport)) 3267 r = r->skip[PF_SKIP_DST_PORT].ptr; 3268 /* icmp only. type always 0 in other cases */ 3269 else if (r->type && r->type != icmptype + 1) 3270 r = TAILQ_NEXT(r, entries); 3271 /* icmp only. type always 0 in other cases */ 3272 else if (r->code && r->code != icmpcode + 1) 3273 r = TAILQ_NEXT(r, entries); 3274 else if (r->tos && !(r->tos == pd->tos)) 3275 r = TAILQ_NEXT(r, entries); 3276 else if (r->rule_flag & PFRULE_FRAGMENT) 3277 r = TAILQ_NEXT(r, entries); 3278 else if (pd->proto == IPPROTO_TCP && 3279 (r->flagset & th->th_flags) != r->flags) 3280 r = TAILQ_NEXT(r, entries); 3281 /* tcp/udp only. uid.op always 0 in other cases */ 3282 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3283 pf_socket_lookup(direction, pd, m), 1)) && 3284 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3285 pd->lookup.uid)) 3286 r = TAILQ_NEXT(r, entries); 3287 /* tcp/udp only. gid.op always 0 in other cases */ 3288 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3289 pf_socket_lookup(direction, pd, m), 1)) && 3290 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3291 pd->lookup.gid)) 3292 r = TAILQ_NEXT(r, entries); 3293 else if (r->prob && 3294 r->prob <= arc4random()) 3295 r = TAILQ_NEXT(r, entries); 3296 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3297 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3298 r = TAILQ_NEXT(r, entries); 3299 else if (r->os_fingerprint != PF_OSFP_ANY && 3300 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3301 pf_osfp_fingerprint(pd, m, off, th), 3302 r->os_fingerprint))) 3303 r = TAILQ_NEXT(r, entries); 3304 else { 3305 if (r->tag) 3306 tag = r->tag; 3307 if (r->rtableid >= 0) 3308 rtableid = r->rtableid; 3309 if (r->anchor == NULL) { 3310 match = 1; 3311 *rm = r; 3312 *am = a; 3313 *rsm = ruleset; 3314 if ((*rm)->quick) 3315 break; 3316 r = TAILQ_NEXT(r, entries); 3317 } else 3318 pf_step_into_anchor(anchor_stack, &asd, 3319 &ruleset, PF_RULESET_FILTER, &r, &a, 3320 &match); 3321 } 3322 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3323 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3324 break; 3325 } 3326 r = *rm; 3327 a = *am; 3328 ruleset = *rsm; 3329 3330 REASON_SET(&reason, PFRES_MATCH); 3331 3332 if (r->log || (nr != NULL && nr->log)) { 3333 if (rewrite) 3334 m_copyback(m, off, hdrlen, pd->hdr.any); 3335 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a, 3336 ruleset, pd, 1); 3337 } 3338 3339 if ((r->action == PF_DROP) && 3340 ((r->rule_flag & PFRULE_RETURNRST) || 3341 (r->rule_flag & PFRULE_RETURNICMP) || 3342 (r->rule_flag & PFRULE_RETURN))) { 3343 /* undo NAT changes, if they have taken place */ 3344 if (nr != NULL) { 3345 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3346 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3347 if (pd->sport) 3348 *pd->sport = sk->port[pd->sidx]; 3349 if (pd->dport) 3350 *pd->dport = sk->port[pd->didx]; 3351 if (pd->proto_sum) 3352 *pd->proto_sum = bproto_sum; 3353 if (pd->ip_sum) 3354 *pd->ip_sum = bip_sum; 3355 m_copyback(m, off, hdrlen, pd->hdr.any); 3356 } 3357 if (pd->proto == IPPROTO_TCP && 3358 ((r->rule_flag & PFRULE_RETURNRST) || 3359 (r->rule_flag & PFRULE_RETURN)) && 3360 !(th->th_flags & TH_RST)) { 3361 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3362 int len = 0; 3363#ifdef INET 3364 struct ip *h4; 3365#endif 3366#ifdef INET6 3367 struct ip6_hdr *h6; 3368#endif 3369 3370 switch (af) { 3371#ifdef INET 3372 case AF_INET: 3373 h4 = mtod(m, struct ip *); 3374 len = ntohs(h4->ip_len) - off; 3375 break; 3376#endif 3377#ifdef INET6 3378 case AF_INET6: 3379 h6 = mtod(m, struct ip6_hdr *); 3380 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3381 break; 3382#endif 3383 } 3384 3385 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3386 REASON_SET(&reason, PFRES_PROTCKSUM); 3387 else { 3388 if (th->th_flags & TH_SYN) 3389 ack++; 3390 if (th->th_flags & TH_FIN) 3391 ack++; 3392 pf_send_tcp(m, r, af, pd->dst, 3393 pd->src, th->th_dport, th->th_sport, 3394 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3395 r->return_ttl, 1, 0, kif->pfik_ifp); 3396 } 3397 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3398 r->return_icmp) 3399 pf_send_icmp(m, r->return_icmp >> 8, 3400 r->return_icmp & 255, af, r); 3401 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3402 r->return_icmp6) 3403 pf_send_icmp(m, r->return_icmp6 >> 8, 3404 r->return_icmp6 & 255, af, r); 3405 } 3406 3407 if (r->action == PF_DROP) 3408 goto cleanup; 3409 3410 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3411 REASON_SET(&reason, PFRES_MEMORY); 3412 goto cleanup; 3413 } 3414 if (rtableid >= 0) 3415 M_SETFIB(m, rtableid); 3416 3417 if (!state_icmp && (r->keep_state || nr != NULL || 3418 (pd->flags & PFDESC_TCP_NORM))) { 3419 int action; 3420 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 3421 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 3422 hdrlen); 3423 if (action != PF_PASS) 3424 return (action); 3425 } else { 3426 if (sk != NULL) 3427 uma_zfree(V_pf_state_key_z, sk); 3428 if (nk != NULL) 3429 uma_zfree(V_pf_state_key_z, nk); 3430 } 3431 3432 /* copy back packet headers if we performed NAT operations */ 3433 if (rewrite) 3434 m_copyback(m, off, hdrlen, pd->hdr.any); 3435 3436 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 3437 direction == PF_OUT && 3438 pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) 3439 /* 3440 * We want the state created, but we dont 3441 * want to send this in case a partner 3442 * firewall has to know about it to allow 3443 * replies through it. 3444 */ 3445 return (PF_DEFER); 3446 3447 return (PF_PASS); 3448 3449cleanup: 3450 if (sk != NULL) 3451 uma_zfree(V_pf_state_key_z, sk); 3452 if (nk != NULL) 3453 uma_zfree(V_pf_state_key_z, nk); 3454 return (PF_DROP); 3455} 3456 3457static int 3458pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, 3459 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk, 3460 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 3461 u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, 3462 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 3463{ 3464 struct pf_state *s = NULL; 3465 struct pf_src_node *sn = NULL; 3466 struct tcphdr *th = pd->hdr.tcp; 3467 u_int16_t mss = V_tcp_mssdflt; 3468 u_short reason; 3469 3470 /* check maximums */ 3471 if (r->max_states && 3472 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 3473 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 3474 REASON_SET(&reason, PFRES_MAXSTATES); 3475 return (PF_DROP); 3476 } 3477 /* src node for filter rule */ 3478 if ((r->rule_flag & PFRULE_SRCTRACK || 3479 r->rpool.opts & PF_POOL_STICKYADDR) && 3480 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 3481 REASON_SET(&reason, PFRES_SRCLIMIT); 3482 goto csfailed; 3483 } 3484 /* src node for translation rule */ 3485 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3486 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 3487 REASON_SET(&reason, PFRES_SRCLIMIT); 3488 goto csfailed; 3489 } 3490 s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); 3491 if (s == NULL) { 3492 REASON_SET(&reason, PFRES_MEMORY); 3493 goto csfailed; 3494 } 3495 s->rule.ptr = r; 3496 s->nat_rule.ptr = nr; 3497 s->anchor.ptr = a; 3498 STATE_INC_COUNTERS(s); 3499 if (r->allow_opts) 3500 s->state_flags |= PFSTATE_ALLOWOPTS; 3501 if (r->rule_flag & PFRULE_STATESLOPPY) 3502 s->state_flags |= PFSTATE_SLOPPY; 3503 s->log = r->log & PF_LOG_ALL; 3504 s->sync_state = PFSYNC_S_NONE; 3505 if (nr != NULL) 3506 s->log |= nr->log & PF_LOG_ALL; 3507 switch (pd->proto) { 3508 case IPPROTO_TCP: 3509 s->src.seqlo = ntohl(th->th_seq); 3510 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 3511 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3512 r->keep_state == PF_STATE_MODULATE) { 3513 /* Generate sequence number modulator */ 3514 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 3515 0) 3516 s->src.seqdiff = 1; 3517 pf_change_a(&th->th_seq, &th->th_sum, 3518 htonl(s->src.seqlo + s->src.seqdiff), 0); 3519 *rewrite = 1; 3520 } else 3521 s->src.seqdiff = 0; 3522 if (th->th_flags & TH_SYN) { 3523 s->src.seqhi++; 3524 s->src.wscale = pf_get_wscale(m, off, 3525 th->th_off, pd->af); 3526 } 3527 s->src.max_win = MAX(ntohs(th->th_win), 1); 3528 if (s->src.wscale & PF_WSCALE_MASK) { 3529 /* Remove scale factor from initial window */ 3530 int win = s->src.max_win; 3531 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3532 s->src.max_win = (win - 1) >> 3533 (s->src.wscale & PF_WSCALE_MASK); 3534 } 3535 if (th->th_flags & TH_FIN) 3536 s->src.seqhi++; 3537 s->dst.seqhi = 1; 3538 s->dst.max_win = 1; 3539 s->src.state = TCPS_SYN_SENT; 3540 s->dst.state = TCPS_CLOSED; 3541 s->timeout = PFTM_TCP_FIRST_PACKET; 3542 break; 3543 case IPPROTO_UDP: 3544 s->src.state = PFUDPS_SINGLE; 3545 s->dst.state = PFUDPS_NO_TRAFFIC; 3546 s->timeout = PFTM_UDP_FIRST_PACKET; 3547 break; 3548 case IPPROTO_ICMP: 3549#ifdef INET6 3550 case IPPROTO_ICMPV6: 3551#endif 3552 s->timeout = PFTM_ICMP_FIRST_PACKET; 3553 break; 3554 default: 3555 s->src.state = PFOTHERS_SINGLE; 3556 s->dst.state = PFOTHERS_NO_TRAFFIC; 3557 s->timeout = PFTM_OTHER_FIRST_PACKET; 3558 } 3559 3560 if (r->rt && r->rt != PF_FASTROUTE) { 3561 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) { 3562 REASON_SET(&reason, PFRES_BADSTATE); 3563 pf_src_tree_remove_state(s); 3564 STATE_DEC_COUNTERS(s); 3565 uma_zfree(V_pf_state_z, s); 3566 goto csfailed; 3567 } 3568 s->rt_kif = r->rpool.cur->kif; 3569 } 3570 3571 s->creation = time_uptime; 3572 s->expire = time_uptime; 3573 3574 if (sn != NULL) { 3575 s->src_node = sn; 3576 s->src_node->states++; 3577 } 3578 if (nsn != NULL) { 3579 /* XXX We only modify one side for now. */ 3580 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 3581 s->nat_src_node = nsn; 3582 s->nat_src_node->states++; 3583 } 3584 if (pd->proto == IPPROTO_TCP) { 3585 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3586 off, pd, th, &s->src, &s->dst)) { 3587 REASON_SET(&reason, PFRES_MEMORY); 3588 pf_src_tree_remove_state(s); 3589 STATE_DEC_COUNTERS(s); 3590 uma_zfree(V_pf_state_z, s); 3591 return (PF_DROP); 3592 } 3593 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3594 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3595 &s->src, &s->dst, rewrite)) { 3596 /* This really shouldn't happen!!! */ 3597 DPFPRINTF(PF_DEBUG_URGENT, 3598 ("pf_normalize_tcp_stateful failed on first pkt")); 3599 pf_normalize_tcp_cleanup(s); 3600 pf_src_tree_remove_state(s); 3601 STATE_DEC_COUNTERS(s); 3602 uma_zfree(V_pf_state_z, s); 3603 return (PF_DROP); 3604 } 3605 } 3606 s->direction = pd->dir; 3607 3608 /* 3609 * sk/nk could already been setup by pf_get_translation(). 3610 */ 3611 if (nr == NULL) { 3612 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 3613 __func__, nr, sk, nk)); 3614 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 3615 if (sk == NULL) 3616 goto csfailed; 3617 nk = sk; 3618 } else 3619 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 3620 __func__, nr, sk, nk)); 3621 3622 /* Swap sk/nk for PF_OUT. */ 3623 if (pf_state_insert(BOUND_IFACE(r, kif), 3624 (pd->dir == PF_IN) ? sk : nk, 3625 (pd->dir == PF_IN) ? nk : sk, s)) { 3626 if (pd->proto == IPPROTO_TCP) 3627 pf_normalize_tcp_cleanup(s); 3628 REASON_SET(&reason, PFRES_STATEINS); 3629 pf_src_tree_remove_state(s); 3630 STATE_DEC_COUNTERS(s); 3631 uma_zfree(V_pf_state_z, s); 3632 return (PF_DROP); 3633 } else 3634 *sm = s; 3635 3636 if (tag > 0) 3637 s->tag = tag; 3638 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 3639 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 3640 s->src.state = PF_TCPS_PROXY_SRC; 3641 /* undo NAT changes, if they have taken place */ 3642 if (nr != NULL) { 3643 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 3644 if (pd->dir == PF_OUT) 3645 skt = s->key[PF_SK_STACK]; 3646 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 3647 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 3648 if (pd->sport) 3649 *pd->sport = skt->port[pd->sidx]; 3650 if (pd->dport) 3651 *pd->dport = skt->port[pd->didx]; 3652 if (pd->proto_sum) 3653 *pd->proto_sum = bproto_sum; 3654 if (pd->ip_sum) 3655 *pd->ip_sum = bip_sum; 3656 m_copyback(m, off, hdrlen, pd->hdr.any); 3657 } 3658 s->src.seqhi = htonl(arc4random()); 3659 /* Find mss option */ 3660 int rtid = M_GETFIB(m); 3661 mss = pf_get_mss(m, off, th->th_off, pd->af); 3662 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 3663 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 3664 s->src.mss = mss; 3665 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, 3666 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3667 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL); 3668 REASON_SET(&reason, PFRES_SYNPROXY); 3669 return (PF_SYNPROXY_DROP); 3670 } 3671 3672 return (PF_PASS); 3673 3674csfailed: 3675 if (sk != NULL) 3676 uma_zfree(V_pf_state_key_z, sk); 3677 if (nk != NULL) 3678 uma_zfree(V_pf_state_key_z, nk); 3679 3680 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3681 pf_unlink_src_node(sn); 3682 pf_free_src_node(sn); 3683 } 3684 3685 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { 3686 pf_unlink_src_node(nsn); 3687 pf_free_src_node(nsn); 3688 } 3689 3690 return (PF_DROP); 3691} 3692 3693static int 3694pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 3695 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 3696 struct pf_ruleset **rsm) 3697{ 3698 struct pf_rule *r, *a = NULL; 3699 struct pf_ruleset *ruleset = NULL; 3700 sa_family_t af = pd->af; 3701 u_short reason; 3702 int tag = -1; 3703 int asd = 0; 3704 int match = 0; 3705 struct pf_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3706 3707 PF_RULES_RASSERT(); 3708 3709 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3710 while (r != NULL) { 3711 r->evaluations++; 3712 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3713 r = r->skip[PF_SKIP_IFP].ptr; 3714 else if (r->direction && r->direction != direction) 3715 r = r->skip[PF_SKIP_DIR].ptr; 3716 else if (r->af && r->af != af) 3717 r = r->skip[PF_SKIP_AF].ptr; 3718 else if (r->proto && r->proto != pd->proto) 3719 r = r->skip[PF_SKIP_PROTO].ptr; 3720 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 3721 r->src.neg, kif, M_GETFIB(m))) 3722 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3723 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 3724 r->dst.neg, NULL, M_GETFIB(m))) 3725 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3726 else if (r->tos && !(r->tos == pd->tos)) 3727 r = TAILQ_NEXT(r, entries); 3728 else if (r->os_fingerprint != PF_OSFP_ANY) 3729 r = TAILQ_NEXT(r, entries); 3730 else if (pd->proto == IPPROTO_UDP && 3731 (r->src.port_op || r->dst.port_op)) 3732 r = TAILQ_NEXT(r, entries); 3733 else if (pd->proto == IPPROTO_TCP && 3734 (r->src.port_op || r->dst.port_op || r->flagset)) 3735 r = TAILQ_NEXT(r, entries); 3736 else if ((pd->proto == IPPROTO_ICMP || 3737 pd->proto == IPPROTO_ICMPV6) && 3738 (r->type || r->code)) 3739 r = TAILQ_NEXT(r, entries); 3740 else if (r->prob && r->prob <= 3741 (arc4random() % (UINT_MAX - 1) + 1)) 3742 r = TAILQ_NEXT(r, entries); 3743 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3744 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3745 r = TAILQ_NEXT(r, entries); 3746 else { 3747 if (r->anchor == NULL) { 3748 match = 1; 3749 *rm = r; 3750 *am = a; 3751 *rsm = ruleset; 3752 if ((*rm)->quick) 3753 break; 3754 r = TAILQ_NEXT(r, entries); 3755 } else 3756 pf_step_into_anchor(anchor_stack, &asd, 3757 &ruleset, PF_RULESET_FILTER, &r, &a, 3758 &match); 3759 } 3760 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3761 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3762 break; 3763 } 3764 r = *rm; 3765 a = *am; 3766 ruleset = *rsm; 3767 3768 REASON_SET(&reason, PFRES_MATCH); 3769 3770 if (r->log) 3771 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 3772 1); 3773 3774 if (r->action != PF_PASS) 3775 return (PF_DROP); 3776 3777 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 3778 REASON_SET(&reason, PFRES_MEMORY); 3779 return (PF_DROP); 3780 } 3781 3782 return (PF_PASS); 3783} 3784 3785static int 3786pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 3787 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 3788 struct pf_pdesc *pd, u_short *reason, int *copyback) 3789{ 3790 struct tcphdr *th = pd->hdr.tcp; 3791 u_int16_t win = ntohs(th->th_win); 3792 u_int32_t ack, end, seq, orig_seq; 3793 u_int8_t sws, dws; 3794 int ackskew; 3795 3796 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 3797 sws = src->wscale & PF_WSCALE_MASK; 3798 dws = dst->wscale & PF_WSCALE_MASK; 3799 } else 3800 sws = dws = 0; 3801 3802 /* 3803 * Sequence tracking algorithm from Guido van Rooij's paper: 3804 * http://www.madison-gurkha.com/publications/tcp_filtering/ 3805 * tcp_filtering.ps 3806 */ 3807 3808 orig_seq = seq = ntohl(th->th_seq); 3809 if (src->seqlo == 0) { 3810 /* First packet from this end. Set its state */ 3811 3812 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 3813 src->scrub == NULL) { 3814 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 3815 REASON_SET(reason, PFRES_MEMORY); 3816 return (PF_DROP); 3817 } 3818 } 3819 3820 /* Deferred generation of sequence number modulator */ 3821 if (dst->seqdiff && !src->seqdiff) { 3822 /* use random iss for the TCP server */ 3823 while ((src->seqdiff = arc4random() - seq) == 0) 3824 ; 3825 ack = ntohl(th->th_ack) - dst->seqdiff; 3826 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3827 src->seqdiff), 0); 3828 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3829 *copyback = 1; 3830 } else { 3831 ack = ntohl(th->th_ack); 3832 } 3833 3834 end = seq + pd->p_len; 3835 if (th->th_flags & TH_SYN) { 3836 end++; 3837 if (dst->wscale & PF_WSCALE_FLAG) { 3838 src->wscale = pf_get_wscale(m, off, th->th_off, 3839 pd->af); 3840 if (src->wscale & PF_WSCALE_FLAG) { 3841 /* Remove scale factor from initial 3842 * window */ 3843 sws = src->wscale & PF_WSCALE_MASK; 3844 win = ((u_int32_t)win + (1 << sws) - 1) 3845 >> sws; 3846 dws = dst->wscale & PF_WSCALE_MASK; 3847 } else { 3848 /* fixup other window */ 3849 dst->max_win <<= dst->wscale & 3850 PF_WSCALE_MASK; 3851 /* in case of a retrans SYN|ACK */ 3852 dst->wscale = 0; 3853 } 3854 } 3855 } 3856 if (th->th_flags & TH_FIN) 3857 end++; 3858 3859 src->seqlo = seq; 3860 if (src->state < TCPS_SYN_SENT) 3861 src->state = TCPS_SYN_SENT; 3862 3863 /* 3864 * May need to slide the window (seqhi may have been set by 3865 * the crappy stack check or if we picked up the connection 3866 * after establishment) 3867 */ 3868 if (src->seqhi == 1 || 3869 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 3870 src->seqhi = end + MAX(1, dst->max_win << dws); 3871 if (win > src->max_win) 3872 src->max_win = win; 3873 3874 } else { 3875 ack = ntohl(th->th_ack) - dst->seqdiff; 3876 if (src->seqdiff) { 3877 /* Modulate sequence numbers */ 3878 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 3879 src->seqdiff), 0); 3880 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 3881 *copyback = 1; 3882 } 3883 end = seq + pd->p_len; 3884 if (th->th_flags & TH_SYN) 3885 end++; 3886 if (th->th_flags & TH_FIN) 3887 end++; 3888 } 3889 3890 if ((th->th_flags & TH_ACK) == 0) { 3891 /* Let it pass through the ack skew check */ 3892 ack = dst->seqlo; 3893 } else if ((ack == 0 && 3894 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 3895 /* broken tcp stacks do not set ack */ 3896 (dst->state < TCPS_SYN_SENT)) { 3897 /* 3898 * Many stacks (ours included) will set the ACK number in an 3899 * FIN|ACK if the SYN times out -- no sequence to ACK. 3900 */ 3901 ack = dst->seqlo; 3902 } 3903 3904 if (seq == end) { 3905 /* Ease sequencing restrictions on no data packets */ 3906 seq = src->seqlo; 3907 end = seq; 3908 } 3909 3910 ackskew = dst->seqlo - ack; 3911 3912 3913 /* 3914 * Need to demodulate the sequence numbers in any TCP SACK options 3915 * (Selective ACK). We could optionally validate the SACK values 3916 * against the current ACK window, either forwards or backwards, but 3917 * I'm not confident that SACK has been implemented properly 3918 * everywhere. It wouldn't surprise me if several stacks accidently 3919 * SACK too far backwards of previously ACKed data. There really aren't 3920 * any security implications of bad SACKing unless the target stack 3921 * doesn't validate the option length correctly. Someone trying to 3922 * spoof into a TCP connection won't bother blindly sending SACK 3923 * options anyway. 3924 */ 3925 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 3926 if (pf_modulate_sack(m, off, pd, th, dst)) 3927 *copyback = 1; 3928 } 3929 3930 3931#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 3932 if (SEQ_GEQ(src->seqhi, end) && 3933 /* Last octet inside other's window space */ 3934 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 3935 /* Retrans: not more than one window back */ 3936 (ackskew >= -MAXACKWINDOW) && 3937 /* Acking not more than one reassembled fragment backwards */ 3938 (ackskew <= (MAXACKWINDOW << sws)) && 3939 /* Acking not more than one window forward */ 3940 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 3941 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 3942 (pd->flags & PFDESC_IP_REAS) == 0)) { 3943 /* Require an exact/+1 sequence match on resets when possible */ 3944 3945 if (dst->scrub || src->scrub) { 3946 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 3947 *state, src, dst, copyback)) 3948 return (PF_DROP); 3949 } 3950 3951 /* update max window */ 3952 if (src->max_win < win) 3953 src->max_win = win; 3954 /* synchronize sequencing */ 3955 if (SEQ_GT(end, src->seqlo)) 3956 src->seqlo = end; 3957 /* slide the window of what the other end can send */ 3958 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 3959 dst->seqhi = ack + MAX((win << sws), 1); 3960 3961 3962 /* update states */ 3963 if (th->th_flags & TH_SYN) 3964 if (src->state < TCPS_SYN_SENT) 3965 src->state = TCPS_SYN_SENT; 3966 if (th->th_flags & TH_FIN) 3967 if (src->state < TCPS_CLOSING) 3968 src->state = TCPS_CLOSING; 3969 if (th->th_flags & TH_ACK) { 3970 if (dst->state == TCPS_SYN_SENT) { 3971 dst->state = TCPS_ESTABLISHED; 3972 if (src->state == TCPS_ESTABLISHED && 3973 (*state)->src_node != NULL && 3974 pf_src_connlimit(state)) { 3975 REASON_SET(reason, PFRES_SRCLIMIT); 3976 return (PF_DROP); 3977 } 3978 } else if (dst->state == TCPS_CLOSING) 3979 dst->state = TCPS_FIN_WAIT_2; 3980 } 3981 if (th->th_flags & TH_RST) 3982 src->state = dst->state = TCPS_TIME_WAIT; 3983 3984 /* update expire time */ 3985 (*state)->expire = time_uptime; 3986 if (src->state >= TCPS_FIN_WAIT_2 && 3987 dst->state >= TCPS_FIN_WAIT_2) 3988 (*state)->timeout = PFTM_TCP_CLOSED; 3989 else if (src->state >= TCPS_CLOSING && 3990 dst->state >= TCPS_CLOSING) 3991 (*state)->timeout = PFTM_TCP_FIN_WAIT; 3992 else if (src->state < TCPS_ESTABLISHED || 3993 dst->state < TCPS_ESTABLISHED) 3994 (*state)->timeout = PFTM_TCP_OPENING; 3995 else if (src->state >= TCPS_CLOSING || 3996 dst->state >= TCPS_CLOSING) 3997 (*state)->timeout = PFTM_TCP_CLOSING; 3998 else 3999 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4000 4001 /* Fall through to PASS packet */ 4002 4003 } else if ((dst->state < TCPS_SYN_SENT || 4004 dst->state >= TCPS_FIN_WAIT_2 || 4005 src->state >= TCPS_FIN_WAIT_2) && 4006 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4007 /* Within a window forward of the originating packet */ 4008 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4009 /* Within a window backward of the originating packet */ 4010 4011 /* 4012 * This currently handles three situations: 4013 * 1) Stupid stacks will shotgun SYNs before their peer 4014 * replies. 4015 * 2) When PF catches an already established stream (the 4016 * firewall rebooted, the state table was flushed, routes 4017 * changed...) 4018 * 3) Packets get funky immediately after the connection 4019 * closes (this should catch Solaris spurious ACK|FINs 4020 * that web servers like to spew after a close) 4021 * 4022 * This must be a little more careful than the above code 4023 * since packet floods will also be caught here. We don't 4024 * update the TTL here to mitigate the damage of a packet 4025 * flood and so the same code can handle awkward establishment 4026 * and a loosened connection close. 4027 * In the establishment case, a correct peer response will 4028 * validate the connection, go through the normal state code 4029 * and keep updating the state TTL. 4030 */ 4031 4032 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4033 printf("pf: loose state match: "); 4034 pf_print_state(*state); 4035 pf_print_flags(th->th_flags); 4036 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4037 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4038 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4039 (unsigned long long)(*state)->packets[1], 4040 pd->dir == PF_IN ? "in" : "out", 4041 pd->dir == (*state)->direction ? "fwd" : "rev"); 4042 } 4043 4044 if (dst->scrub || src->scrub) { 4045 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4046 *state, src, dst, copyback)) 4047 return (PF_DROP); 4048 } 4049 4050 /* update max window */ 4051 if (src->max_win < win) 4052 src->max_win = win; 4053 /* synchronize sequencing */ 4054 if (SEQ_GT(end, src->seqlo)) 4055 src->seqlo = end; 4056 /* slide the window of what the other end can send */ 4057 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4058 dst->seqhi = ack + MAX((win << sws), 1); 4059 4060 /* 4061 * Cannot set dst->seqhi here since this could be a shotgunned 4062 * SYN and not an already established connection. 4063 */ 4064 4065 if (th->th_flags & TH_FIN) 4066 if (src->state < TCPS_CLOSING) 4067 src->state = TCPS_CLOSING; 4068 if (th->th_flags & TH_RST) 4069 src->state = dst->state = TCPS_TIME_WAIT; 4070 4071 /* Fall through to PASS packet */ 4072 4073 } else { 4074 if ((*state)->dst.state == TCPS_SYN_SENT && 4075 (*state)->src.state == TCPS_SYN_SENT) { 4076 /* Send RST for state mismatches during handshake */ 4077 if (!(th->th_flags & TH_RST)) 4078 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4079 pd->dst, pd->src, th->th_dport, 4080 th->th_sport, ntohl(th->th_ack), 0, 4081 TH_RST, 0, 0, 4082 (*state)->rule.ptr->return_ttl, 1, 0, 4083 kif->pfik_ifp); 4084 src->seqlo = 0; 4085 src->seqhi = 1; 4086 src->max_win = 1; 4087 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4088 printf("pf: BAD state: "); 4089 pf_print_state(*state); 4090 pf_print_flags(th->th_flags); 4091 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4092 "pkts=%llu:%llu dir=%s,%s\n", 4093 seq, orig_seq, ack, pd->p_len, ackskew, 4094 (unsigned long long)(*state)->packets[0], 4095 (unsigned long long)(*state)->packets[1], 4096 pd->dir == PF_IN ? "in" : "out", 4097 pd->dir == (*state)->direction ? "fwd" : "rev"); 4098 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4099 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4100 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4101 ' ': '2', 4102 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4103 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4104 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4105 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4106 } 4107 REASON_SET(reason, PFRES_BADSTATE); 4108 return (PF_DROP); 4109 } 4110 4111 return (PF_PASS); 4112} 4113 4114static int 4115pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 4116 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 4117{ 4118 struct tcphdr *th = pd->hdr.tcp; 4119 4120 if (th->th_flags & TH_SYN) 4121 if (src->state < TCPS_SYN_SENT) 4122 src->state = TCPS_SYN_SENT; 4123 if (th->th_flags & TH_FIN) 4124 if (src->state < TCPS_CLOSING) 4125 src->state = TCPS_CLOSING; 4126 if (th->th_flags & TH_ACK) { 4127 if (dst->state == TCPS_SYN_SENT) { 4128 dst->state = TCPS_ESTABLISHED; 4129 if (src->state == TCPS_ESTABLISHED && 4130 (*state)->src_node != NULL && 4131 pf_src_connlimit(state)) { 4132 REASON_SET(reason, PFRES_SRCLIMIT); 4133 return (PF_DROP); 4134 } 4135 } else if (dst->state == TCPS_CLOSING) { 4136 dst->state = TCPS_FIN_WAIT_2; 4137 } else if (src->state == TCPS_SYN_SENT && 4138 dst->state < TCPS_SYN_SENT) { 4139 /* 4140 * Handle a special sloppy case where we only see one 4141 * half of the connection. If there is a ACK after 4142 * the initial SYN without ever seeing a packet from 4143 * the destination, set the connection to established. 4144 */ 4145 dst->state = src->state = TCPS_ESTABLISHED; 4146 if ((*state)->src_node != NULL && 4147 pf_src_connlimit(state)) { 4148 REASON_SET(reason, PFRES_SRCLIMIT); 4149 return (PF_DROP); 4150 } 4151 } else if (src->state == TCPS_CLOSING && 4152 dst->state == TCPS_ESTABLISHED && 4153 dst->seqlo == 0) { 4154 /* 4155 * Handle the closing of half connections where we 4156 * don't see the full bidirectional FIN/ACK+ACK 4157 * handshake. 4158 */ 4159 dst->state = TCPS_CLOSING; 4160 } 4161 } 4162 if (th->th_flags & TH_RST) 4163 src->state = dst->state = TCPS_TIME_WAIT; 4164 4165 /* update expire time */ 4166 (*state)->expire = time_uptime; 4167 if (src->state >= TCPS_FIN_WAIT_2 && 4168 dst->state >= TCPS_FIN_WAIT_2) 4169 (*state)->timeout = PFTM_TCP_CLOSED; 4170 else if (src->state >= TCPS_CLOSING && 4171 dst->state >= TCPS_CLOSING) 4172 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4173 else if (src->state < TCPS_ESTABLISHED || 4174 dst->state < TCPS_ESTABLISHED) 4175 (*state)->timeout = PFTM_TCP_OPENING; 4176 else if (src->state >= TCPS_CLOSING || 4177 dst->state >= TCPS_CLOSING) 4178 (*state)->timeout = PFTM_TCP_CLOSING; 4179 else 4180 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4181 4182 return (PF_PASS); 4183} 4184 4185static int 4186pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 4187 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4188 u_short *reason) 4189{ 4190 struct pf_state_key_cmp key; 4191 struct tcphdr *th = pd->hdr.tcp; 4192 int copyback = 0; 4193 struct pf_state_peer *src, *dst; 4194 struct pf_state_key *sk; 4195 4196 bzero(&key, sizeof(key)); 4197 key.af = pd->af; 4198 key.proto = IPPROTO_TCP; 4199 if (direction == PF_IN) { /* wire side, straight */ 4200 PF_ACPY(&key.addr[0], pd->src, key.af); 4201 PF_ACPY(&key.addr[1], pd->dst, key.af); 4202 key.port[0] = th->th_sport; 4203 key.port[1] = th->th_dport; 4204 } else { /* stack side, reverse */ 4205 PF_ACPY(&key.addr[1], pd->src, key.af); 4206 PF_ACPY(&key.addr[0], pd->dst, key.af); 4207 key.port[1] = th->th_sport; 4208 key.port[0] = th->th_dport; 4209 } 4210 4211 STATE_LOOKUP(kif, &key, direction, *state, pd); 4212 4213 if (direction == (*state)->direction) { 4214 src = &(*state)->src; 4215 dst = &(*state)->dst; 4216 } else { 4217 src = &(*state)->dst; 4218 dst = &(*state)->src; 4219 } 4220 4221 sk = (*state)->key[pd->didx]; 4222 4223 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4224 if (direction != (*state)->direction) { 4225 REASON_SET(reason, PFRES_SYNPROXY); 4226 return (PF_SYNPROXY_DROP); 4227 } 4228 if (th->th_flags & TH_SYN) { 4229 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4230 REASON_SET(reason, PFRES_SYNPROXY); 4231 return (PF_DROP); 4232 } 4233 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4234 pd->src, th->th_dport, th->th_sport, 4235 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4236 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL); 4237 REASON_SET(reason, PFRES_SYNPROXY); 4238 return (PF_SYNPROXY_DROP); 4239 } else if (!(th->th_flags & TH_ACK) || 4240 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4241 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4242 REASON_SET(reason, PFRES_SYNPROXY); 4243 return (PF_DROP); 4244 } else if ((*state)->src_node != NULL && 4245 pf_src_connlimit(state)) { 4246 REASON_SET(reason, PFRES_SRCLIMIT); 4247 return (PF_DROP); 4248 } else 4249 (*state)->src.state = PF_TCPS_PROXY_DST; 4250 } 4251 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4252 if (direction == (*state)->direction) { 4253 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4254 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4255 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4256 REASON_SET(reason, PFRES_SYNPROXY); 4257 return (PF_DROP); 4258 } 4259 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4260 if ((*state)->dst.seqhi == 1) 4261 (*state)->dst.seqhi = htonl(arc4random()); 4262 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4263 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4264 sk->port[pd->sidx], sk->port[pd->didx], 4265 (*state)->dst.seqhi, 0, TH_SYN, 0, 4266 (*state)->src.mss, 0, 0, (*state)->tag, NULL); 4267 REASON_SET(reason, PFRES_SYNPROXY); 4268 return (PF_SYNPROXY_DROP); 4269 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4270 (TH_SYN|TH_ACK)) || 4271 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4272 REASON_SET(reason, PFRES_SYNPROXY); 4273 return (PF_DROP); 4274 } else { 4275 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4276 (*state)->dst.seqlo = ntohl(th->th_seq); 4277 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 4278 pd->src, th->th_dport, th->th_sport, 4279 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4280 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4281 (*state)->tag, NULL); 4282 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 4283 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4284 sk->port[pd->sidx], sk->port[pd->didx], 4285 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4286 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL); 4287 (*state)->src.seqdiff = (*state)->dst.seqhi - 4288 (*state)->src.seqlo; 4289 (*state)->dst.seqdiff = (*state)->src.seqhi - 4290 (*state)->dst.seqlo; 4291 (*state)->src.seqhi = (*state)->src.seqlo + 4292 (*state)->dst.max_win; 4293 (*state)->dst.seqhi = (*state)->dst.seqlo + 4294 (*state)->src.max_win; 4295 (*state)->src.wscale = (*state)->dst.wscale = 0; 4296 (*state)->src.state = (*state)->dst.state = 4297 TCPS_ESTABLISHED; 4298 REASON_SET(reason, PFRES_SYNPROXY); 4299 return (PF_SYNPROXY_DROP); 4300 } 4301 } 4302 4303 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4304 dst->state >= TCPS_FIN_WAIT_2 && 4305 src->state >= TCPS_FIN_WAIT_2) { 4306 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4307 printf("pf: state reuse "); 4308 pf_print_state(*state); 4309 pf_print_flags(th->th_flags); 4310 printf("\n"); 4311 } 4312 /* XXX make sure it's the same direction ?? */ 4313 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 4314 pf_unlink_state(*state, PF_ENTER_LOCKED); 4315 *state = NULL; 4316 return (PF_DROP); 4317 } 4318 4319 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4320 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 4321 return (PF_DROP); 4322 } else { 4323 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 4324 ©back) == PF_DROP) 4325 return (PF_DROP); 4326 } 4327 4328 /* translate source/destination address, if necessary */ 4329 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4330 struct pf_state_key *nk = (*state)->key[pd->didx]; 4331 4332 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4333 nk->port[pd->sidx] != th->th_sport) 4334 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 4335 &th->th_sum, &nk->addr[pd->sidx], 4336 nk->port[pd->sidx], 0, pd->af); 4337 4338 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4339 nk->port[pd->didx] != th->th_dport) 4340 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 4341 &th->th_sum, &nk->addr[pd->didx], 4342 nk->port[pd->didx], 0, pd->af); 4343 copyback = 1; 4344 } 4345 4346 /* Copyback sequence modulation or stateful scrub changes if needed */ 4347 if (copyback) 4348 m_copyback(m, off, sizeof(*th), (caddr_t)th); 4349 4350 return (PF_PASS); 4351} 4352 4353static int 4354pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 4355 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 4356{ 4357 struct pf_state_peer *src, *dst; 4358 struct pf_state_key_cmp key; 4359 struct udphdr *uh = pd->hdr.udp; 4360 4361 bzero(&key, sizeof(key)); 4362 key.af = pd->af; 4363 key.proto = IPPROTO_UDP; 4364 if (direction == PF_IN) { /* wire side, straight */ 4365 PF_ACPY(&key.addr[0], pd->src, key.af); 4366 PF_ACPY(&key.addr[1], pd->dst, key.af); 4367 key.port[0] = uh->uh_sport; 4368 key.port[1] = uh->uh_dport; 4369 } else { /* stack side, reverse */ 4370 PF_ACPY(&key.addr[1], pd->src, key.af); 4371 PF_ACPY(&key.addr[0], pd->dst, key.af); 4372 key.port[1] = uh->uh_sport; 4373 key.port[0] = uh->uh_dport; 4374 } 4375 4376 STATE_LOOKUP(kif, &key, direction, *state, pd); 4377 4378 if (direction == (*state)->direction) { 4379 src = &(*state)->src; 4380 dst = &(*state)->dst; 4381 } else { 4382 src = &(*state)->dst; 4383 dst = &(*state)->src; 4384 } 4385 4386 /* update states */ 4387 if (src->state < PFUDPS_SINGLE) 4388 src->state = PFUDPS_SINGLE; 4389 if (dst->state == PFUDPS_SINGLE) 4390 dst->state = PFUDPS_MULTIPLE; 4391 4392 /* update expire time */ 4393 (*state)->expire = time_uptime; 4394 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 4395 (*state)->timeout = PFTM_UDP_MULTIPLE; 4396 else 4397 (*state)->timeout = PFTM_UDP_SINGLE; 4398 4399 /* translate source/destination address, if necessary */ 4400 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4401 struct pf_state_key *nk = (*state)->key[pd->didx]; 4402 4403 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 4404 nk->port[pd->sidx] != uh->uh_sport) 4405 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 4406 &uh->uh_sum, &nk->addr[pd->sidx], 4407 nk->port[pd->sidx], 1, pd->af); 4408 4409 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 4410 nk->port[pd->didx] != uh->uh_dport) 4411 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 4412 &uh->uh_sum, &nk->addr[pd->didx], 4413 nk->port[pd->didx], 1, pd->af); 4414 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4415 } 4416 4417 return (PF_PASS); 4418} 4419 4420static int 4421pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 4422 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 4423{ 4424 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4425 u_int16_t icmpid = 0, *icmpsum; 4426 u_int8_t icmptype; 4427 int state_icmp = 0; 4428 struct pf_state_key_cmp key; 4429 4430 bzero(&key, sizeof(key)); 4431 switch (pd->proto) { 4432#ifdef INET 4433 case IPPROTO_ICMP: 4434 icmptype = pd->hdr.icmp->icmp_type; 4435 icmpid = pd->hdr.icmp->icmp_id; 4436 icmpsum = &pd->hdr.icmp->icmp_cksum; 4437 4438 if (icmptype == ICMP_UNREACH || 4439 icmptype == ICMP_SOURCEQUENCH || 4440 icmptype == ICMP_REDIRECT || 4441 icmptype == ICMP_TIMXCEED || 4442 icmptype == ICMP_PARAMPROB) 4443 state_icmp++; 4444 break; 4445#endif /* INET */ 4446#ifdef INET6 4447 case IPPROTO_ICMPV6: 4448 icmptype = pd->hdr.icmp6->icmp6_type; 4449 icmpid = pd->hdr.icmp6->icmp6_id; 4450 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 4451 4452 if (icmptype == ICMP6_DST_UNREACH || 4453 icmptype == ICMP6_PACKET_TOO_BIG || 4454 icmptype == ICMP6_TIME_EXCEEDED || 4455 icmptype == ICMP6_PARAM_PROB) 4456 state_icmp++; 4457 break; 4458#endif /* INET6 */ 4459 } 4460 4461 if (!state_icmp) { 4462 4463 /* 4464 * ICMP query/reply message not related to a TCP/UDP packet. 4465 * Search for an ICMP state. 4466 */ 4467 key.af = pd->af; 4468 key.proto = pd->proto; 4469 key.port[0] = key.port[1] = icmpid; 4470 if (direction == PF_IN) { /* wire side, straight */ 4471 PF_ACPY(&key.addr[0], pd->src, key.af); 4472 PF_ACPY(&key.addr[1], pd->dst, key.af); 4473 } else { /* stack side, reverse */ 4474 PF_ACPY(&key.addr[1], pd->src, key.af); 4475 PF_ACPY(&key.addr[0], pd->dst, key.af); 4476 } 4477 4478 STATE_LOOKUP(kif, &key, direction, *state, pd); 4479 4480 (*state)->expire = time_uptime; 4481 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 4482 4483 /* translate source/destination address, if necessary */ 4484 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 4485 struct pf_state_key *nk = (*state)->key[pd->didx]; 4486 4487 switch (pd->af) { 4488#ifdef INET 4489 case AF_INET: 4490 if (PF_ANEQ(pd->src, 4491 &nk->addr[pd->sidx], AF_INET)) 4492 pf_change_a(&saddr->v4.s_addr, 4493 pd->ip_sum, 4494 nk->addr[pd->sidx].v4.s_addr, 0); 4495 4496 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 4497 AF_INET)) 4498 pf_change_a(&daddr->v4.s_addr, 4499 pd->ip_sum, 4500 nk->addr[pd->didx].v4.s_addr, 0); 4501 4502 if (nk->port[0] != 4503 pd->hdr.icmp->icmp_id) { 4504 pd->hdr.icmp->icmp_cksum = 4505 pf_cksum_fixup( 4506 pd->hdr.icmp->icmp_cksum, icmpid, 4507 nk->port[pd->sidx], 0); 4508 pd->hdr.icmp->icmp_id = 4509 nk->port[pd->sidx]; 4510 } 4511 4512 m_copyback(m, off, ICMP_MINLEN, 4513 (caddr_t )pd->hdr.icmp); 4514 break; 4515#endif /* INET */ 4516#ifdef INET6 4517 case AF_INET6: 4518 if (PF_ANEQ(pd->src, 4519 &nk->addr[pd->sidx], AF_INET6)) 4520 pf_change_a6(saddr, 4521 &pd->hdr.icmp6->icmp6_cksum, 4522 &nk->addr[pd->sidx], 0); 4523 4524 if (PF_ANEQ(pd->dst, 4525 &nk->addr[pd->didx], AF_INET6)) 4526 pf_change_a6(daddr, 4527 &pd->hdr.icmp6->icmp6_cksum, 4528 &nk->addr[pd->didx], 0); 4529 4530 m_copyback(m, off, sizeof(struct icmp6_hdr), 4531 (caddr_t )pd->hdr.icmp6); 4532 break; 4533#endif /* INET6 */ 4534 } 4535 } 4536 return (PF_PASS); 4537 4538 } else { 4539 /* 4540 * ICMP error message in response to a TCP/UDP packet. 4541 * Extract the inner TCP/UDP header and search for that state. 4542 */ 4543 4544 struct pf_pdesc pd2; 4545 bzero(&pd2, sizeof pd2); 4546#ifdef INET 4547 struct ip h2; 4548#endif /* INET */ 4549#ifdef INET6 4550 struct ip6_hdr h2_6; 4551 int terminal = 0; 4552#endif /* INET6 */ 4553 int ipoff2 = 0; 4554 int off2 = 0; 4555 4556 pd2.af = pd->af; 4557 /* Payload packet is from the opposite direction. */ 4558 pd2.sidx = (direction == PF_IN) ? 1 : 0; 4559 pd2.didx = (direction == PF_IN) ? 0 : 1; 4560 switch (pd->af) { 4561#ifdef INET 4562 case AF_INET: 4563 /* offset of h2 in mbuf chain */ 4564 ipoff2 = off + ICMP_MINLEN; 4565 4566 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 4567 NULL, reason, pd2.af)) { 4568 DPFPRINTF(PF_DEBUG_MISC, 4569 ("pf: ICMP error message too short " 4570 "(ip)\n")); 4571 return (PF_DROP); 4572 } 4573 /* 4574 * ICMP error messages don't refer to non-first 4575 * fragments 4576 */ 4577 if (h2.ip_off & htons(IP_OFFMASK)) { 4578 REASON_SET(reason, PFRES_FRAG); 4579 return (PF_DROP); 4580 } 4581 4582 /* offset of protocol header that follows h2 */ 4583 off2 = ipoff2 + (h2.ip_hl << 2); 4584 4585 pd2.proto = h2.ip_p; 4586 pd2.src = (struct pf_addr *)&h2.ip_src; 4587 pd2.dst = (struct pf_addr *)&h2.ip_dst; 4588 pd2.ip_sum = &h2.ip_sum; 4589 break; 4590#endif /* INET */ 4591#ifdef INET6 4592 case AF_INET6: 4593 ipoff2 = off + sizeof(struct icmp6_hdr); 4594 4595 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 4596 NULL, reason, pd2.af)) { 4597 DPFPRINTF(PF_DEBUG_MISC, 4598 ("pf: ICMP error message too short " 4599 "(ip6)\n")); 4600 return (PF_DROP); 4601 } 4602 pd2.proto = h2_6.ip6_nxt; 4603 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 4604 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 4605 pd2.ip_sum = NULL; 4606 off2 = ipoff2 + sizeof(h2_6); 4607 do { 4608 switch (pd2.proto) { 4609 case IPPROTO_FRAGMENT: 4610 /* 4611 * ICMPv6 error messages for 4612 * non-first fragments 4613 */ 4614 REASON_SET(reason, PFRES_FRAG); 4615 return (PF_DROP); 4616 case IPPROTO_AH: 4617 case IPPROTO_HOPOPTS: 4618 case IPPROTO_ROUTING: 4619 case IPPROTO_DSTOPTS: { 4620 /* get next header and header length */ 4621 struct ip6_ext opt6; 4622 4623 if (!pf_pull_hdr(m, off2, &opt6, 4624 sizeof(opt6), NULL, reason, 4625 pd2.af)) { 4626 DPFPRINTF(PF_DEBUG_MISC, 4627 ("pf: ICMPv6 short opt\n")); 4628 return (PF_DROP); 4629 } 4630 if (pd2.proto == IPPROTO_AH) 4631 off2 += (opt6.ip6e_len + 2) * 4; 4632 else 4633 off2 += (opt6.ip6e_len + 1) * 8; 4634 pd2.proto = opt6.ip6e_nxt; 4635 /* goto the next header */ 4636 break; 4637 } 4638 default: 4639 terminal++; 4640 break; 4641 } 4642 } while (!terminal); 4643 break; 4644#endif /* INET6 */ 4645 } 4646 4647 switch (pd2.proto) { 4648 case IPPROTO_TCP: { 4649 struct tcphdr th; 4650 u_int32_t seq; 4651 struct pf_state_peer *src, *dst; 4652 u_int8_t dws; 4653 int copyback = 0; 4654 4655 /* 4656 * Only the first 8 bytes of the TCP header can be 4657 * expected. Don't access any TCP header fields after 4658 * th_seq, an ackskew test is not possible. 4659 */ 4660 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 4661 pd2.af)) { 4662 DPFPRINTF(PF_DEBUG_MISC, 4663 ("pf: ICMP error message too short " 4664 "(tcp)\n")); 4665 return (PF_DROP); 4666 } 4667 4668 key.af = pd2.af; 4669 key.proto = IPPROTO_TCP; 4670 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4671 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4672 key.port[pd2.sidx] = th.th_sport; 4673 key.port[pd2.didx] = th.th_dport; 4674 4675 STATE_LOOKUP(kif, &key, direction, *state, pd); 4676 4677 if (direction == (*state)->direction) { 4678 src = &(*state)->dst; 4679 dst = &(*state)->src; 4680 } else { 4681 src = &(*state)->src; 4682 dst = &(*state)->dst; 4683 } 4684 4685 if (src->wscale && dst->wscale) 4686 dws = dst->wscale & PF_WSCALE_MASK; 4687 else 4688 dws = 0; 4689 4690 /* Demodulate sequence number */ 4691 seq = ntohl(th.th_seq) - src->seqdiff; 4692 if (src->seqdiff) { 4693 pf_change_a(&th.th_seq, icmpsum, 4694 htonl(seq), 0); 4695 copyback = 1; 4696 } 4697 4698 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 4699 (!SEQ_GEQ(src->seqhi, seq) || 4700 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 4701 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4702 printf("pf: BAD ICMP %d:%d ", 4703 icmptype, pd->hdr.icmp->icmp_code); 4704 pf_print_host(pd->src, 0, pd->af); 4705 printf(" -> "); 4706 pf_print_host(pd->dst, 0, pd->af); 4707 printf(" state: "); 4708 pf_print_state(*state); 4709 printf(" seq=%u\n", seq); 4710 } 4711 REASON_SET(reason, PFRES_BADSTATE); 4712 return (PF_DROP); 4713 } else { 4714 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4715 printf("pf: OK ICMP %d:%d ", 4716 icmptype, pd->hdr.icmp->icmp_code); 4717 pf_print_host(pd->src, 0, pd->af); 4718 printf(" -> "); 4719 pf_print_host(pd->dst, 0, pd->af); 4720 printf(" state: "); 4721 pf_print_state(*state); 4722 printf(" seq=%u\n", seq); 4723 } 4724 } 4725 4726 /* translate source/destination address, if necessary */ 4727 if ((*state)->key[PF_SK_WIRE] != 4728 (*state)->key[PF_SK_STACK]) { 4729 struct pf_state_key *nk = 4730 (*state)->key[pd->didx]; 4731 4732 if (PF_ANEQ(pd2.src, 4733 &nk->addr[pd2.sidx], pd2.af) || 4734 nk->port[pd2.sidx] != th.th_sport) 4735 pf_change_icmp(pd2.src, &th.th_sport, 4736 daddr, &nk->addr[pd2.sidx], 4737 nk->port[pd2.sidx], NULL, 4738 pd2.ip_sum, icmpsum, 4739 pd->ip_sum, 0, pd2.af); 4740 4741 if (PF_ANEQ(pd2.dst, 4742 &nk->addr[pd2.didx], pd2.af) || 4743 nk->port[pd2.didx] != th.th_dport) 4744 pf_change_icmp(pd2.dst, &th.th_dport, 4745 NULL, /* XXX Inbound NAT? */ 4746 &nk->addr[pd2.didx], 4747 nk->port[pd2.didx], NULL, 4748 pd2.ip_sum, icmpsum, 4749 pd->ip_sum, 0, pd2.af); 4750 copyback = 1; 4751 } 4752 4753 if (copyback) { 4754 switch (pd2.af) { 4755#ifdef INET 4756 case AF_INET: 4757 m_copyback(m, off, ICMP_MINLEN, 4758 (caddr_t )pd->hdr.icmp); 4759 m_copyback(m, ipoff2, sizeof(h2), 4760 (caddr_t )&h2); 4761 break; 4762#endif /* INET */ 4763#ifdef INET6 4764 case AF_INET6: 4765 m_copyback(m, off, 4766 sizeof(struct icmp6_hdr), 4767 (caddr_t )pd->hdr.icmp6); 4768 m_copyback(m, ipoff2, sizeof(h2_6), 4769 (caddr_t )&h2_6); 4770 break; 4771#endif /* INET6 */ 4772 } 4773 m_copyback(m, off2, 8, (caddr_t)&th); 4774 } 4775 4776 return (PF_PASS); 4777 break; 4778 } 4779 case IPPROTO_UDP: { 4780 struct udphdr uh; 4781 4782 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 4783 NULL, reason, pd2.af)) { 4784 DPFPRINTF(PF_DEBUG_MISC, 4785 ("pf: ICMP error message too short " 4786 "(udp)\n")); 4787 return (PF_DROP); 4788 } 4789 4790 key.af = pd2.af; 4791 key.proto = IPPROTO_UDP; 4792 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4793 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4794 key.port[pd2.sidx] = uh.uh_sport; 4795 key.port[pd2.didx] = uh.uh_dport; 4796 4797 STATE_LOOKUP(kif, &key, direction, *state, pd); 4798 4799 /* translate source/destination address, if necessary */ 4800 if ((*state)->key[PF_SK_WIRE] != 4801 (*state)->key[PF_SK_STACK]) { 4802 struct pf_state_key *nk = 4803 (*state)->key[pd->didx]; 4804 4805 if (PF_ANEQ(pd2.src, 4806 &nk->addr[pd2.sidx], pd2.af) || 4807 nk->port[pd2.sidx] != uh.uh_sport) 4808 pf_change_icmp(pd2.src, &uh.uh_sport, 4809 daddr, &nk->addr[pd2.sidx], 4810 nk->port[pd2.sidx], &uh.uh_sum, 4811 pd2.ip_sum, icmpsum, 4812 pd->ip_sum, 1, pd2.af); 4813 4814 if (PF_ANEQ(pd2.dst, 4815 &nk->addr[pd2.didx], pd2.af) || 4816 nk->port[pd2.didx] != uh.uh_dport) 4817 pf_change_icmp(pd2.dst, &uh.uh_dport, 4818 NULL, /* XXX Inbound NAT? */ 4819 &nk->addr[pd2.didx], 4820 nk->port[pd2.didx], &uh.uh_sum, 4821 pd2.ip_sum, icmpsum, 4822 pd->ip_sum, 1, pd2.af); 4823 4824 switch (pd2.af) { 4825#ifdef INET 4826 case AF_INET: 4827 m_copyback(m, off, ICMP_MINLEN, 4828 (caddr_t )pd->hdr.icmp); 4829 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4830 break; 4831#endif /* INET */ 4832#ifdef INET6 4833 case AF_INET6: 4834 m_copyback(m, off, 4835 sizeof(struct icmp6_hdr), 4836 (caddr_t )pd->hdr.icmp6); 4837 m_copyback(m, ipoff2, sizeof(h2_6), 4838 (caddr_t )&h2_6); 4839 break; 4840#endif /* INET6 */ 4841 } 4842 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 4843 } 4844 return (PF_PASS); 4845 break; 4846 } 4847#ifdef INET 4848 case IPPROTO_ICMP: { 4849 struct icmp iih; 4850 4851 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 4852 NULL, reason, pd2.af)) { 4853 DPFPRINTF(PF_DEBUG_MISC, 4854 ("pf: ICMP error message too short i" 4855 "(icmp)\n")); 4856 return (PF_DROP); 4857 } 4858 4859 key.af = pd2.af; 4860 key.proto = IPPROTO_ICMP; 4861 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4862 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4863 key.port[0] = key.port[1] = iih.icmp_id; 4864 4865 STATE_LOOKUP(kif, &key, direction, *state, pd); 4866 4867 /* translate source/destination address, if necessary */ 4868 if ((*state)->key[PF_SK_WIRE] != 4869 (*state)->key[PF_SK_STACK]) { 4870 struct pf_state_key *nk = 4871 (*state)->key[pd->didx]; 4872 4873 if (PF_ANEQ(pd2.src, 4874 &nk->addr[pd2.sidx], pd2.af) || 4875 nk->port[pd2.sidx] != iih.icmp_id) 4876 pf_change_icmp(pd2.src, &iih.icmp_id, 4877 daddr, &nk->addr[pd2.sidx], 4878 nk->port[pd2.sidx], NULL, 4879 pd2.ip_sum, icmpsum, 4880 pd->ip_sum, 0, AF_INET); 4881 4882 if (PF_ANEQ(pd2.dst, 4883 &nk->addr[pd2.didx], pd2.af) || 4884 nk->port[pd2.didx] != iih.icmp_id) 4885 pf_change_icmp(pd2.dst, &iih.icmp_id, 4886 NULL, /* XXX Inbound NAT? */ 4887 &nk->addr[pd2.didx], 4888 nk->port[pd2.didx], NULL, 4889 pd2.ip_sum, icmpsum, 4890 pd->ip_sum, 0, AF_INET); 4891 4892 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); 4893 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4894 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 4895 } 4896 return (PF_PASS); 4897 break; 4898 } 4899#endif /* INET */ 4900#ifdef INET6 4901 case IPPROTO_ICMPV6: { 4902 struct icmp6_hdr iih; 4903 4904 if (!pf_pull_hdr(m, off2, &iih, 4905 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 4906 DPFPRINTF(PF_DEBUG_MISC, 4907 ("pf: ICMP error message too short " 4908 "(icmp6)\n")); 4909 return (PF_DROP); 4910 } 4911 4912 key.af = pd2.af; 4913 key.proto = IPPROTO_ICMPV6; 4914 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4915 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4916 key.port[0] = key.port[1] = iih.icmp6_id; 4917 4918 STATE_LOOKUP(kif, &key, direction, *state, pd); 4919 4920 /* translate source/destination address, if necessary */ 4921 if ((*state)->key[PF_SK_WIRE] != 4922 (*state)->key[PF_SK_STACK]) { 4923 struct pf_state_key *nk = 4924 (*state)->key[pd->didx]; 4925 4926 if (PF_ANEQ(pd2.src, 4927 &nk->addr[pd2.sidx], pd2.af) || 4928 nk->port[pd2.sidx] != iih.icmp6_id) 4929 pf_change_icmp(pd2.src, &iih.icmp6_id, 4930 daddr, &nk->addr[pd2.sidx], 4931 nk->port[pd2.sidx], NULL, 4932 pd2.ip_sum, icmpsum, 4933 pd->ip_sum, 0, AF_INET6); 4934 4935 if (PF_ANEQ(pd2.dst, 4936 &nk->addr[pd2.didx], pd2.af) || 4937 nk->port[pd2.didx] != iih.icmp6_id) 4938 pf_change_icmp(pd2.dst, &iih.icmp6_id, 4939 NULL, /* XXX Inbound NAT? */ 4940 &nk->addr[pd2.didx], 4941 nk->port[pd2.didx], NULL, 4942 pd2.ip_sum, icmpsum, 4943 pd->ip_sum, 0, AF_INET6); 4944 4945 m_copyback(m, off, sizeof(struct icmp6_hdr), 4946 (caddr_t)pd->hdr.icmp6); 4947 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 4948 m_copyback(m, off2, sizeof(struct icmp6_hdr), 4949 (caddr_t)&iih); 4950 } 4951 return (PF_PASS); 4952 break; 4953 } 4954#endif /* INET6 */ 4955 default: { 4956 key.af = pd2.af; 4957 key.proto = pd2.proto; 4958 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 4959 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 4960 key.port[0] = key.port[1] = 0; 4961 4962 STATE_LOOKUP(kif, &key, direction, *state, pd); 4963 4964 /* translate source/destination address, if necessary */ 4965 if ((*state)->key[PF_SK_WIRE] != 4966 (*state)->key[PF_SK_STACK]) { 4967 struct pf_state_key *nk = 4968 (*state)->key[pd->didx]; 4969 4970 if (PF_ANEQ(pd2.src, 4971 &nk->addr[pd2.sidx], pd2.af)) 4972 pf_change_icmp(pd2.src, NULL, daddr, 4973 &nk->addr[pd2.sidx], 0, NULL, 4974 pd2.ip_sum, icmpsum, 4975 pd->ip_sum, 0, pd2.af); 4976 4977 if (PF_ANEQ(pd2.dst, 4978 &nk->addr[pd2.didx], pd2.af)) 4979 pf_change_icmp(pd2.src, NULL, 4980 NULL, /* XXX Inbound NAT? */ 4981 &nk->addr[pd2.didx], 0, NULL, 4982 pd2.ip_sum, icmpsum, 4983 pd->ip_sum, 0, pd2.af); 4984 4985 switch (pd2.af) { 4986#ifdef INET 4987 case AF_INET: 4988 m_copyback(m, off, ICMP_MINLEN, 4989 (caddr_t)pd->hdr.icmp); 4990 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 4991 break; 4992#endif /* INET */ 4993#ifdef INET6 4994 case AF_INET6: 4995 m_copyback(m, off, 4996 sizeof(struct icmp6_hdr), 4997 (caddr_t )pd->hdr.icmp6); 4998 m_copyback(m, ipoff2, sizeof(h2_6), 4999 (caddr_t )&h2_6); 5000 break; 5001#endif /* INET6 */ 5002 } 5003 } 5004 return (PF_PASS); 5005 break; 5006 } 5007 } 5008 } 5009} 5010 5011static int 5012pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5013 struct mbuf *m, struct pf_pdesc *pd) 5014{ 5015 struct pf_state_peer *src, *dst; 5016 struct pf_state_key_cmp key; 5017 5018 bzero(&key, sizeof(key)); 5019 key.af = pd->af; 5020 key.proto = pd->proto; 5021 if (direction == PF_IN) { 5022 PF_ACPY(&key.addr[0], pd->src, key.af); 5023 PF_ACPY(&key.addr[1], pd->dst, key.af); 5024 key.port[0] = key.port[1] = 0; 5025 } else { 5026 PF_ACPY(&key.addr[1], pd->src, key.af); 5027 PF_ACPY(&key.addr[0], pd->dst, key.af); 5028 key.port[1] = key.port[0] = 0; 5029 } 5030 5031 STATE_LOOKUP(kif, &key, direction, *state, pd); 5032 5033 if (direction == (*state)->direction) { 5034 src = &(*state)->src; 5035 dst = &(*state)->dst; 5036 } else { 5037 src = &(*state)->dst; 5038 dst = &(*state)->src; 5039 } 5040 5041 /* update states */ 5042 if (src->state < PFOTHERS_SINGLE) 5043 src->state = PFOTHERS_SINGLE; 5044 if (dst->state == PFOTHERS_SINGLE) 5045 dst->state = PFOTHERS_MULTIPLE; 5046 5047 /* update expire time */ 5048 (*state)->expire = time_uptime; 5049 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5050 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5051 else 5052 (*state)->timeout = PFTM_OTHER_SINGLE; 5053 5054 /* translate source/destination address, if necessary */ 5055 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5056 struct pf_state_key *nk = (*state)->key[pd->didx]; 5057 5058 KASSERT(nk, ("%s: nk is null", __func__)); 5059 KASSERT(pd, ("%s: pd is null", __func__)); 5060 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5061 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5062 switch (pd->af) { 5063#ifdef INET 5064 case AF_INET: 5065 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5066 pf_change_a(&pd->src->v4.s_addr, 5067 pd->ip_sum, 5068 nk->addr[pd->sidx].v4.s_addr, 5069 0); 5070 5071 5072 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5073 pf_change_a(&pd->dst->v4.s_addr, 5074 pd->ip_sum, 5075 nk->addr[pd->didx].v4.s_addr, 5076 0); 5077 5078 break; 5079#endif /* INET */ 5080#ifdef INET6 5081 case AF_INET6: 5082 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5083 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5084 5085 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5086 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5087#endif /* INET6 */ 5088 } 5089 } 5090 return (PF_PASS); 5091} 5092 5093/* 5094 * ipoff and off are measured from the start of the mbuf chain. 5095 * h must be at "ipoff" on the mbuf chain. 5096 */ 5097void * 5098pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5099 u_short *actionp, u_short *reasonp, sa_family_t af) 5100{ 5101 switch (af) { 5102#ifdef INET 5103 case AF_INET: { 5104 struct ip *h = mtod(m, struct ip *); 5105 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5106 5107 if (fragoff) { 5108 if (fragoff >= len) 5109 ACTION_SET(actionp, PF_PASS); 5110 else { 5111 ACTION_SET(actionp, PF_DROP); 5112 REASON_SET(reasonp, PFRES_FRAG); 5113 } 5114 return (NULL); 5115 } 5116 if (m->m_pkthdr.len < off + len || 5117 ntohs(h->ip_len) < off + len) { 5118 ACTION_SET(actionp, PF_DROP); 5119 REASON_SET(reasonp, PFRES_SHORT); 5120 return (NULL); 5121 } 5122 break; 5123 } 5124#endif /* INET */ 5125#ifdef INET6 5126 case AF_INET6: { 5127 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5128 5129 if (m->m_pkthdr.len < off + len || 5130 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5131 (unsigned)(off + len)) { 5132 ACTION_SET(actionp, PF_DROP); 5133 REASON_SET(reasonp, PFRES_SHORT); 5134 return (NULL); 5135 } 5136 break; 5137 } 5138#endif /* INET6 */ 5139 } 5140 m_copydata(m, off, len, p); 5141 return (p); 5142} 5143 5144int 5145pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, 5146 int rtableid) 5147{ 5148#ifdef RADIX_MPATH 5149 struct radix_node_head *rnh; 5150#endif 5151 struct sockaddr_in *dst; 5152 int ret = 1; 5153 int check_mpath; 5154#ifdef INET6 5155 struct sockaddr_in6 *dst6; 5156 struct route_in6 ro; 5157#else 5158 struct route ro; 5159#endif 5160 struct radix_node *rn; 5161 struct rtentry *rt; 5162 struct ifnet *ifp; 5163 5164 check_mpath = 0; 5165#ifdef RADIX_MPATH 5166 /* XXX: stick to table 0 for now */ 5167 rnh = rt_tables_get_rnh(0, af); 5168 if (rnh != NULL && rn_mpath_capable(rnh)) 5169 check_mpath = 1; 5170#endif 5171 bzero(&ro, sizeof(ro)); 5172 switch (af) { 5173 case AF_INET: 5174 dst = satosin(&ro.ro_dst); 5175 dst->sin_family = AF_INET; 5176 dst->sin_len = sizeof(*dst); 5177 dst->sin_addr = addr->v4; 5178 break; 5179#ifdef INET6 5180 case AF_INET6: 5181 /* 5182 * Skip check for addresses with embedded interface scope, 5183 * as they would always match anyway. 5184 */ 5185 if (IN6_IS_SCOPE_EMBED(&addr->v6)) 5186 goto out; 5187 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 5188 dst6->sin6_family = AF_INET6; 5189 dst6->sin6_len = sizeof(*dst6); 5190 dst6->sin6_addr = addr->v6; 5191 break; 5192#endif /* INET6 */ 5193 default: 5194 return (0); 5195 } 5196 5197 /* Skip checks for ipsec interfaces */ 5198 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5199 goto out; 5200 5201 switch (af) { 5202#ifdef INET6 5203 case AF_INET6: 5204 in6_rtalloc_ign(&ro, 0, rtableid); 5205 break; 5206#endif 5207#ifdef INET 5208 case AF_INET: 5209 in_rtalloc_ign((struct route *)&ro, 0, rtableid); 5210 break; 5211#endif 5212 default: 5213 rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ 5214 break; 5215 } 5216 5217 if (ro.ro_rt != NULL) { 5218 /* No interface given, this is a no-route check */ 5219 if (kif == NULL) 5220 goto out; 5221 5222 if (kif->pfik_ifp == NULL) { 5223 ret = 0; 5224 goto out; 5225 } 5226 5227 /* Perform uRPF check if passed input interface */ 5228 ret = 0; 5229 rn = (struct radix_node *)ro.ro_rt; 5230 do { 5231 rt = (struct rtentry *)rn; 5232 ifp = rt->rt_ifp; 5233 5234 if (kif->pfik_ifp == ifp) 5235 ret = 1; 5236#ifdef RADIX_MPATH 5237 rn = rn_mpath_next(rn); 5238#endif 5239 } while (check_mpath == 1 && rn != NULL && ret == 0); 5240 } else 5241 ret = 0; 5242out: 5243 if (ro.ro_rt != NULL) 5244 RTFREE(ro.ro_rt); 5245 return (ret); 5246} 5247 5248#ifdef INET 5249static void 5250pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5251 struct pf_state *s, struct pf_pdesc *pd) 5252{ 5253 struct mbuf *m0, *m1; 5254 struct sockaddr_in dst; 5255 struct ip *ip; 5256 struct ifnet *ifp = NULL; 5257 struct pf_addr naddr; 5258 struct pf_src_node *sn = NULL; 5259 int error = 0; 5260 uint16_t ip_len, ip_off; 5261 5262 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5263 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5264 __func__)); 5265 5266 if ((pd->pf_mtag == NULL && 5267 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5268 pd->pf_mtag->routed++ > 3) { 5269 m0 = *m; 5270 *m = NULL; 5271 goto bad_locked; 5272 } 5273 5274 if (r->rt == PF_DUPTO) { 5275 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5276 if (s) 5277 PF_STATE_UNLOCK(s); 5278 return; 5279 } 5280 } else { 5281 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5282 if (s) 5283 PF_STATE_UNLOCK(s); 5284 return; 5285 } 5286 m0 = *m; 5287 } 5288 5289 ip = mtod(m0, struct ip *); 5290 5291 bzero(&dst, sizeof(dst)); 5292 dst.sin_family = AF_INET; 5293 dst.sin_len = sizeof(dst); 5294 dst.sin_addr = ip->ip_dst; 5295 5296 if (r->rt == PF_FASTROUTE) { 5297 struct rtentry *rt; 5298 5299 if (s) 5300 PF_STATE_UNLOCK(s); 5301 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0)); 5302 if (rt == NULL) { 5303 KMOD_IPSTAT_INC(ips_noroute); 5304 error = EHOSTUNREACH; 5305 goto bad; 5306 } 5307 5308 ifp = rt->rt_ifp; 5309 counter_u64_add(rt->rt_pksent, 1); 5310 5311 if (rt->rt_flags & RTF_GATEWAY) 5312 bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst)); 5313 RTFREE_LOCKED(rt); 5314 } else { 5315 if (TAILQ_EMPTY(&r->rpool.list)) { 5316 DPFPRINTF(PF_DEBUG_URGENT, 5317 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5318 goto bad_locked; 5319 } 5320 if (s == NULL) { 5321 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5322 &naddr, NULL, &sn); 5323 if (!PF_AZERO(&naddr, AF_INET)) 5324 dst.sin_addr.s_addr = naddr.v4.s_addr; 5325 ifp = r->rpool.cur->kif ? 5326 r->rpool.cur->kif->pfik_ifp : NULL; 5327 } else { 5328 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5329 dst.sin_addr.s_addr = 5330 s->rt_addr.v4.s_addr; 5331 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5332 PF_STATE_UNLOCK(s); 5333 } 5334 } 5335 if (ifp == NULL) 5336 goto bad; 5337 5338 if (oifp != ifp) { 5339 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 5340 goto bad; 5341 else if (m0 == NULL) 5342 goto done; 5343 if (m0->m_len < sizeof(struct ip)) { 5344 DPFPRINTF(PF_DEBUG_URGENT, 5345 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5346 goto bad; 5347 } 5348 ip = mtod(m0, struct ip *); 5349 } 5350 5351 if (ifp->if_flags & IFF_LOOPBACK) 5352 m0->m_flags |= M_SKIP_FIREWALL; 5353 5354 ip_len = ntohs(ip->ip_len); 5355 ip_off = ntohs(ip->ip_off); 5356 5357 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5358 m0->m_pkthdr.csum_flags |= CSUM_IP; 5359 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5360 in_delayed_cksum(m0); 5361 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5362 } 5363#ifdef SCTP 5364 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 5365 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 5366 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 5367 } 5368#endif 5369 5370 /* 5371 * If small enough for interface, or the interface will take 5372 * care of the fragmentation for us, we can just send directly. 5373 */ 5374 if (ip_len <= ifp->if_mtu || 5375 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 5376 ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 5377 ip->ip_sum = 0; 5378 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 5379 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 5380 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 5381 } 5382 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 5383 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5384 goto done; 5385 } 5386 5387 /* Balk when DF bit is set or the interface didn't support TSO. */ 5388 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 5389 error = EMSGSIZE; 5390 KMOD_IPSTAT_INC(ips_cantfrag); 5391 if (r->rt != PF_DUPTO) { 5392 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 5393 ifp->if_mtu); 5394 goto done; 5395 } else 5396 goto bad; 5397 } 5398 5399 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 5400 if (error) 5401 goto bad; 5402 5403 for (; m0; m0 = m1) { 5404 m1 = m0->m_nextpkt; 5405 m0->m_nextpkt = NULL; 5406 if (error == 0) { 5407 m_clrprotoflags(m0); 5408 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 5409 } else 5410 m_freem(m0); 5411 } 5412 5413 if (error == 0) 5414 KMOD_IPSTAT_INC(ips_fragmented); 5415 5416done: 5417 if (r->rt != PF_DUPTO) 5418 *m = NULL; 5419 return; 5420 5421bad_locked: 5422 if (s) 5423 PF_STATE_UNLOCK(s); 5424bad: 5425 m_freem(m0); 5426 goto done; 5427} 5428#endif /* INET */ 5429 5430#ifdef INET6 5431static void 5432pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 5433 struct pf_state *s, struct pf_pdesc *pd) 5434{ 5435 struct mbuf *m0; 5436 struct sockaddr_in6 dst; 5437 struct ip6_hdr *ip6; 5438 struct ifnet *ifp = NULL; 5439 struct pf_addr naddr; 5440 struct pf_src_node *sn = NULL; 5441 5442 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5443 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5444 __func__)); 5445 5446 if ((pd->pf_mtag == NULL && 5447 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5448 pd->pf_mtag->routed++ > 3) { 5449 m0 = *m; 5450 *m = NULL; 5451 goto bad_locked; 5452 } 5453 5454 if (r->rt == PF_DUPTO) { 5455 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { 5456 if (s) 5457 PF_STATE_UNLOCK(s); 5458 return; 5459 } 5460 } else { 5461 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5462 if (s) 5463 PF_STATE_UNLOCK(s); 5464 return; 5465 } 5466 m0 = *m; 5467 } 5468 5469 ip6 = mtod(m0, struct ip6_hdr *); 5470 5471 bzero(&dst, sizeof(dst)); 5472 dst.sin6_family = AF_INET6; 5473 dst.sin6_len = sizeof(dst); 5474 dst.sin6_addr = ip6->ip6_dst; 5475 5476 /* Cheat. XXX why only in the v6 case??? */ 5477 if (r->rt == PF_FASTROUTE) { 5478 if (s) 5479 PF_STATE_UNLOCK(s); 5480 m0->m_flags |= M_SKIP_FIREWALL; 5481 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 5482 *m = NULL; 5483 return; 5484 } 5485 5486 if (TAILQ_EMPTY(&r->rpool.list)) { 5487 DPFPRINTF(PF_DEBUG_URGENT, 5488 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5489 goto bad_locked; 5490 } 5491 if (s == NULL) { 5492 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 5493 &naddr, NULL, &sn); 5494 if (!PF_AZERO(&naddr, AF_INET6)) 5495 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5496 &naddr, AF_INET6); 5497 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 5498 } else { 5499 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 5500 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 5501 &s->rt_addr, AF_INET6); 5502 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5503 } 5504 5505 if (s) 5506 PF_STATE_UNLOCK(s); 5507 5508 if (ifp == NULL) 5509 goto bad; 5510 5511 if (oifp != ifp) { 5512 if (pf_test6(PF_FWD, ifp, &m0, NULL) != PF_PASS) 5513 goto bad; 5514 else if (m0 == NULL) 5515 goto done; 5516 if (m0->m_len < sizeof(struct ip6_hdr)) { 5517 DPFPRINTF(PF_DEBUG_URGENT, 5518 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 5519 __func__)); 5520 goto bad; 5521 } 5522 ip6 = mtod(m0, struct ip6_hdr *); 5523 } 5524 5525 if (ifp->if_flags & IFF_LOOPBACK) 5526 m0->m_flags |= M_SKIP_FIREWALL; 5527 5528 /* 5529 * If the packet is too large for the outgoing interface, 5530 * send back an icmp6 error. 5531 */ 5532 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 5533 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 5534 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 5535 nd6_output(ifp, ifp, m0, &dst, NULL); 5536 else { 5537 in6_ifstat_inc(ifp, ifs6_in_toobig); 5538 if (r->rt != PF_DUPTO) 5539 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 5540 else 5541 goto bad; 5542 } 5543 5544done: 5545 if (r->rt != PF_DUPTO) 5546 *m = NULL; 5547 return; 5548 5549bad_locked: 5550 if (s) 5551 PF_STATE_UNLOCK(s); 5552bad: 5553 m_freem(m0); 5554 goto done; 5555} 5556#endif /* INET6 */ 5557 5558/* 5559 * FreeBSD supports cksum offloads for the following drivers. 5560 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 5561 * ti(4), txp(4), xl(4) 5562 * 5563 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 5564 * network driver performed cksum including pseudo header, need to verify 5565 * csum_data 5566 * CSUM_DATA_VALID : 5567 * network driver performed cksum, needs to additional pseudo header 5568 * cksum computation with partial csum_data(i.e. lack of H/W support for 5569 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 5570 * 5571 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 5572 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 5573 * TCP/UDP layer. 5574 * Also, set csum_data to 0xffff to force cksum validation. 5575 */ 5576static int 5577pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 5578{ 5579 u_int16_t sum = 0; 5580 int hw_assist = 0; 5581 struct ip *ip; 5582 5583 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 5584 return (1); 5585 if (m->m_pkthdr.len < off + len) 5586 return (1); 5587 5588 switch (p) { 5589 case IPPROTO_TCP: 5590 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5591 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5592 sum = m->m_pkthdr.csum_data; 5593 } else { 5594 ip = mtod(m, struct ip *); 5595 sum = in_pseudo(ip->ip_src.s_addr, 5596 ip->ip_dst.s_addr, htonl((u_short)len + 5597 m->m_pkthdr.csum_data + IPPROTO_TCP)); 5598 } 5599 sum ^= 0xffff; 5600 ++hw_assist; 5601 } 5602 break; 5603 case IPPROTO_UDP: 5604 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 5605 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 5606 sum = m->m_pkthdr.csum_data; 5607 } else { 5608 ip = mtod(m, struct ip *); 5609 sum = in_pseudo(ip->ip_src.s_addr, 5610 ip->ip_dst.s_addr, htonl((u_short)len + 5611 m->m_pkthdr.csum_data + IPPROTO_UDP)); 5612 } 5613 sum ^= 0xffff; 5614 ++hw_assist; 5615 } 5616 break; 5617 case IPPROTO_ICMP: 5618#ifdef INET6 5619 case IPPROTO_ICMPV6: 5620#endif /* INET6 */ 5621 break; 5622 default: 5623 return (1); 5624 } 5625 5626 if (!hw_assist) { 5627 switch (af) { 5628 case AF_INET: 5629 if (p == IPPROTO_ICMP) { 5630 if (m->m_len < off) 5631 return (1); 5632 m->m_data += off; 5633 m->m_len -= off; 5634 sum = in_cksum(m, len); 5635 m->m_data -= off; 5636 m->m_len += off; 5637 } else { 5638 if (m->m_len < sizeof(struct ip)) 5639 return (1); 5640 sum = in4_cksum(m, p, off, len); 5641 } 5642 break; 5643#ifdef INET6 5644 case AF_INET6: 5645 if (m->m_len < sizeof(struct ip6_hdr)) 5646 return (1); 5647 sum = in6_cksum(m, p, off, len); 5648 break; 5649#endif /* INET6 */ 5650 default: 5651 return (1); 5652 } 5653 } 5654 if (sum) { 5655 switch (p) { 5656 case IPPROTO_TCP: 5657 { 5658 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 5659 break; 5660 } 5661 case IPPROTO_UDP: 5662 { 5663 KMOD_UDPSTAT_INC(udps_badsum); 5664 break; 5665 } 5666#ifdef INET 5667 case IPPROTO_ICMP: 5668 { 5669 KMOD_ICMPSTAT_INC(icps_checksum); 5670 break; 5671 } 5672#endif 5673#ifdef INET6 5674 case IPPROTO_ICMPV6: 5675 { 5676 KMOD_ICMP6STAT_INC(icp6s_checksum); 5677 break; 5678 } 5679#endif /* INET6 */ 5680 } 5681 return (1); 5682 } else { 5683 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 5684 m->m_pkthdr.csum_flags |= 5685 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 5686 m->m_pkthdr.csum_data = 0xffff; 5687 } 5688 } 5689 return (0); 5690} 5691 5692 5693#ifdef INET 5694int 5695pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 5696{ 5697 struct pfi_kif *kif; 5698 u_short action, reason = 0, log = 0; 5699 struct mbuf *m = *m0; 5700 struct ip *h = NULL; 5701 struct m_tag *ipfwtag; 5702 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 5703 struct pf_state *s = NULL; 5704 struct pf_ruleset *ruleset = NULL; 5705 struct pf_pdesc pd; 5706 int off, dirndx, pqid = 0; 5707 5708 M_ASSERTPKTHDR(m); 5709 5710 if (!V_pf_status.running) 5711 return (PF_PASS); 5712 5713 memset(&pd, 0, sizeof(pd)); 5714 5715 kif = (struct pfi_kif *)ifp->if_pf_kif; 5716 5717 if (kif == NULL) { 5718 DPFPRINTF(PF_DEBUG_URGENT, 5719 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 5720 return (PF_DROP); 5721 } 5722 if (kif->pfik_flags & PFI_IFLAG_SKIP) 5723 return (PF_PASS); 5724 5725 if (m->m_flags & M_SKIP_FIREWALL) 5726 return (PF_PASS); 5727 5728 pd.pf_mtag = pf_find_mtag(m); 5729 5730 PF_RULES_RLOCK(); 5731 5732 if (ip_divert_ptr != NULL && 5733 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 5734 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 5735 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 5736 if (pd.pf_mtag == NULL && 5737 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5738 action = PF_DROP; 5739 goto done; 5740 } 5741 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 5742 m_tag_delete(m, ipfwtag); 5743 } 5744 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 5745 m->m_flags |= M_FASTFWD_OURS; 5746 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 5747 } 5748 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 5749 /* We do IP header normalization and packet reassembly here */ 5750 action = PF_DROP; 5751 goto done; 5752 } 5753 m = *m0; /* pf_normalize messes with m0 */ 5754 h = mtod(m, struct ip *); 5755 5756 off = h->ip_hl << 2; 5757 if (off < (int)sizeof(struct ip)) { 5758 action = PF_DROP; 5759 REASON_SET(&reason, PFRES_SHORT); 5760 log = 1; 5761 goto done; 5762 } 5763 5764 pd.src = (struct pf_addr *)&h->ip_src; 5765 pd.dst = (struct pf_addr *)&h->ip_dst; 5766 pd.sport = pd.dport = NULL; 5767 pd.ip_sum = &h->ip_sum; 5768 pd.proto_sum = NULL; 5769 pd.proto = h->ip_p; 5770 pd.dir = dir; 5771 pd.sidx = (dir == PF_IN) ? 0 : 1; 5772 pd.didx = (dir == PF_IN) ? 1 : 0; 5773 pd.af = AF_INET; 5774 pd.tos = h->ip_tos; 5775 pd.tot_len = ntohs(h->ip_len); 5776 5777 /* handle fragments that didn't get reassembled by normalization */ 5778 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 5779 action = pf_test_fragment(&r, dir, kif, m, h, 5780 &pd, &a, &ruleset); 5781 goto done; 5782 } 5783 5784 switch (h->ip_p) { 5785 5786 case IPPROTO_TCP: { 5787 struct tcphdr th; 5788 5789 pd.hdr.tcp = &th; 5790 if (!pf_pull_hdr(m, off, &th, sizeof(th), 5791 &action, &reason, AF_INET)) { 5792 log = action != PF_PASS; 5793 goto done; 5794 } 5795 pd.p_len = pd.tot_len - off - (th.th_off << 2); 5796 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 5797 pqid = 1; 5798 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 5799 if (action == PF_DROP) 5800 goto done; 5801 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 5802 &reason); 5803 if (action == PF_PASS) { 5804 if (pfsync_update_state_ptr != NULL) 5805 pfsync_update_state_ptr(s); 5806 r = s->rule.ptr; 5807 a = s->anchor.ptr; 5808 log = s->log; 5809 } else if (s == NULL) 5810 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5811 &a, &ruleset, inp); 5812 break; 5813 } 5814 5815 case IPPROTO_UDP: { 5816 struct udphdr uh; 5817 5818 pd.hdr.udp = &uh; 5819 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 5820 &action, &reason, AF_INET)) { 5821 log = action != PF_PASS; 5822 goto done; 5823 } 5824 if (uh.uh_dport == 0 || 5825 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 5826 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 5827 action = PF_DROP; 5828 REASON_SET(&reason, PFRES_SHORT); 5829 goto done; 5830 } 5831 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 5832 if (action == PF_PASS) { 5833 if (pfsync_update_state_ptr != NULL) 5834 pfsync_update_state_ptr(s); 5835 r = s->rule.ptr; 5836 a = s->anchor.ptr; 5837 log = s->log; 5838 } else if (s == NULL) 5839 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5840 &a, &ruleset, inp); 5841 break; 5842 } 5843 5844 case IPPROTO_ICMP: { 5845 struct icmp ih; 5846 5847 pd.hdr.icmp = &ih; 5848 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 5849 &action, &reason, AF_INET)) { 5850 log = action != PF_PASS; 5851 goto done; 5852 } 5853 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 5854 &reason); 5855 if (action == PF_PASS) { 5856 if (pfsync_update_state_ptr != NULL) 5857 pfsync_update_state_ptr(s); 5858 r = s->rule.ptr; 5859 a = s->anchor.ptr; 5860 log = s->log; 5861 } else if (s == NULL) 5862 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5863 &a, &ruleset, inp); 5864 break; 5865 } 5866 5867#ifdef INET6 5868 case IPPROTO_ICMPV6: { 5869 action = PF_DROP; 5870 DPFPRINTF(PF_DEBUG_MISC, 5871 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 5872 goto done; 5873 } 5874#endif 5875 5876 default: 5877 action = pf_test_state_other(&s, dir, kif, m, &pd); 5878 if (action == PF_PASS) { 5879 if (pfsync_update_state_ptr != NULL) 5880 pfsync_update_state_ptr(s); 5881 r = s->rule.ptr; 5882 a = s->anchor.ptr; 5883 log = s->log; 5884 } else if (s == NULL) 5885 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 5886 &a, &ruleset, inp); 5887 break; 5888 } 5889 5890done: 5891 PF_RULES_RUNLOCK(); 5892 if (action == PF_PASS && h->ip_hl > 5 && 5893 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 5894 action = PF_DROP; 5895 REASON_SET(&reason, PFRES_IPOPTIONS); 5896 log = 1; 5897 DPFPRINTF(PF_DEBUG_MISC, 5898 ("pf: dropping packet with ip options\n")); 5899 } 5900 5901 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 5902 action = PF_DROP; 5903 REASON_SET(&reason, PFRES_MEMORY); 5904 } 5905 if (r->rtableid >= 0) 5906 M_SETFIB(m, r->rtableid); 5907 5908#ifdef ALTQ 5909 if (action == PF_PASS && r->qid) { 5910 if (pd.pf_mtag == NULL && 5911 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5912 action = PF_DROP; 5913 REASON_SET(&reason, PFRES_MEMORY); 5914 } 5915 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 5916 pd.pf_mtag->qid = r->pqid; 5917 else 5918 pd.pf_mtag->qid = r->qid; 5919 /* add hints for ecn */ 5920 pd.pf_mtag->hdr = h; 5921 5922 } 5923#endif /* ALTQ */ 5924 5925 /* 5926 * connections redirected to loopback should not match sockets 5927 * bound specifically to loopback due to security implications, 5928 * see tcp_input() and in_pcblookup_listen(). 5929 */ 5930 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 5931 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 5932 (s->nat_rule.ptr->action == PF_RDR || 5933 s->nat_rule.ptr->action == PF_BINAT) && 5934 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 5935 m->m_flags |= M_SKIP_FIREWALL; 5936 5937 if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && 5938 !PACKET_LOOPED(&pd)) { 5939 5940 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 5941 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 5942 if (ipfwtag != NULL) { 5943 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 5944 ntohs(r->divert.port); 5945 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 5946 5947 if (s) 5948 PF_STATE_UNLOCK(s); 5949 5950 m_tag_prepend(m, ipfwtag); 5951 if (m->m_flags & M_FASTFWD_OURS) { 5952 if (pd.pf_mtag == NULL && 5953 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 5954 action = PF_DROP; 5955 REASON_SET(&reason, PFRES_MEMORY); 5956 log = 1; 5957 DPFPRINTF(PF_DEBUG_MISC, 5958 ("pf: failed to allocate tag\n")); 5959 } 5960 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; 5961 m->m_flags &= ~M_FASTFWD_OURS; 5962 } 5963 ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); 5964 *m0 = NULL; 5965 5966 return (action); 5967 } else { 5968 /* XXX: ipfw has the same behaviour! */ 5969 action = PF_DROP; 5970 REASON_SET(&reason, PFRES_MEMORY); 5971 log = 1; 5972 DPFPRINTF(PF_DEBUG_MISC, 5973 ("pf: failed to allocate divert tag\n")); 5974 } 5975 } 5976 5977 if (log) { 5978 struct pf_rule *lr; 5979 5980 if (s != NULL && s->nat_rule.ptr != NULL && 5981 s->nat_rule.ptr->log & PF_LOG_ALL) 5982 lr = s->nat_rule.ptr; 5983 else 5984 lr = r; 5985 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 5986 (s == NULL)); 5987 } 5988 5989 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 5990 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 5991 5992 if (action == PF_PASS || r->action == PF_DROP) { 5993 dirndx = (dir == PF_OUT); 5994 r->packets[dirndx]++; 5995 r->bytes[dirndx] += pd.tot_len; 5996 if (a != NULL) { 5997 a->packets[dirndx]++; 5998 a->bytes[dirndx] += pd.tot_len; 5999 } 6000 if (s != NULL) { 6001 if (s->nat_rule.ptr != NULL) { 6002 s->nat_rule.ptr->packets[dirndx]++; 6003 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6004 } 6005 if (s->src_node != NULL) { 6006 s->src_node->packets[dirndx]++; 6007 s->src_node->bytes[dirndx] += pd.tot_len; 6008 } 6009 if (s->nat_src_node != NULL) { 6010 s->nat_src_node->packets[dirndx]++; 6011 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6012 } 6013 dirndx = (dir == s->direction) ? 0 : 1; 6014 s->packets[dirndx]++; 6015 s->bytes[dirndx] += pd.tot_len; 6016 } 6017 tr = r; 6018 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6019 if (nr != NULL && r == &V_pf_default_rule) 6020 tr = nr; 6021 if (tr->src.addr.type == PF_ADDR_TABLE) 6022 pfr_update_stats(tr->src.addr.p.tbl, 6023 (s == NULL) ? pd.src : 6024 &s->key[(s->direction == PF_IN)]-> 6025 addr[(s->direction == PF_OUT)], 6026 pd.af, pd.tot_len, dir == PF_OUT, 6027 r->action == PF_PASS, tr->src.neg); 6028 if (tr->dst.addr.type == PF_ADDR_TABLE) 6029 pfr_update_stats(tr->dst.addr.p.tbl, 6030 (s == NULL) ? pd.dst : 6031 &s->key[(s->direction == PF_IN)]-> 6032 addr[(s->direction == PF_IN)], 6033 pd.af, pd.tot_len, dir == PF_OUT, 6034 r->action == PF_PASS, tr->dst.neg); 6035 } 6036 6037 switch (action) { 6038 case PF_SYNPROXY_DROP: 6039 m_freem(*m0); 6040 case PF_DEFER: 6041 *m0 = NULL; 6042 action = PF_PASS; 6043 break; 6044 case PF_DROP: 6045 m_freem(*m0); 6046 *m0 = NULL; 6047 break; 6048 default: 6049 /* pf_route() returns unlocked. */ 6050 if (r->rt) { 6051 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); 6052 return (action); 6053 } 6054 break; 6055 } 6056 if (s) 6057 PF_STATE_UNLOCK(s); 6058 6059 return (action); 6060} 6061#endif /* INET */ 6062 6063#ifdef INET6 6064int 6065pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6066{ 6067 struct pfi_kif *kif; 6068 u_short action, reason = 0, log = 0; 6069 struct mbuf *m = *m0, *n = NULL; 6070 struct m_tag *mtag; 6071 struct ip6_hdr *h = NULL; 6072 struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6073 struct pf_state *s = NULL; 6074 struct pf_ruleset *ruleset = NULL; 6075 struct pf_pdesc pd; 6076 int off, terminal = 0, dirndx, rh_cnt = 0; 6077 int fwdir = dir; 6078 6079 M_ASSERTPKTHDR(m); 6080 6081 if (ifp != m->m_pkthdr.rcvif) 6082 fwdir = PF_FWD; 6083 6084 if (!V_pf_status.running) 6085 return (PF_PASS); 6086 6087 memset(&pd, 0, sizeof(pd)); 6088 pd.pf_mtag = pf_find_mtag(m); 6089 6090 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6091 return (PF_PASS); 6092 6093 kif = (struct pfi_kif *)ifp->if_pf_kif; 6094 if (kif == NULL) { 6095 DPFPRINTF(PF_DEBUG_URGENT, 6096 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6097 return (PF_DROP); 6098 } 6099 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6100 return (PF_PASS); 6101 6102 if (m->m_flags & M_SKIP_FIREWALL) 6103 return (PF_PASS); 6104 6105 PF_RULES_RLOCK(); 6106 6107 /* We do IP header normalization and packet reassembly here */ 6108 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6109 action = PF_DROP; 6110 goto done; 6111 } 6112 m = *m0; /* pf_normalize messes with m0 */ 6113 h = mtod(m, struct ip6_hdr *); 6114 6115#if 1 6116 /* 6117 * we do not support jumbogram yet. if we keep going, zero ip6_plen 6118 * will do something bad, so drop the packet for now. 6119 */ 6120 if (htons(h->ip6_plen) == 0) { 6121 action = PF_DROP; 6122 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6123 goto done; 6124 } 6125#endif 6126 6127 pd.src = (struct pf_addr *)&h->ip6_src; 6128 pd.dst = (struct pf_addr *)&h->ip6_dst; 6129 pd.sport = pd.dport = NULL; 6130 pd.ip_sum = NULL; 6131 pd.proto_sum = NULL; 6132 pd.dir = dir; 6133 pd.sidx = (dir == PF_IN) ? 0 : 1; 6134 pd.didx = (dir == PF_IN) ? 1 : 0; 6135 pd.af = AF_INET6; 6136 pd.tos = 0; 6137 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6138 6139 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6140 pd.proto = h->ip6_nxt; 6141 do { 6142 switch (pd.proto) { 6143 case IPPROTO_FRAGMENT: 6144 action = pf_test_fragment(&r, dir, kif, m, h, 6145 &pd, &a, &ruleset); 6146 if (action == PF_DROP) 6147 REASON_SET(&reason, PFRES_FRAG); 6148 goto done; 6149 case IPPROTO_ROUTING: { 6150 struct ip6_rthdr rthdr; 6151 6152 if (rh_cnt++) { 6153 DPFPRINTF(PF_DEBUG_MISC, 6154 ("pf: IPv6 more than one rthdr\n")); 6155 action = PF_DROP; 6156 REASON_SET(&reason, PFRES_IPOPTIONS); 6157 log = 1; 6158 goto done; 6159 } 6160 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 6161 &reason, pd.af)) { 6162 DPFPRINTF(PF_DEBUG_MISC, 6163 ("pf: IPv6 short rthdr\n")); 6164 action = PF_DROP; 6165 REASON_SET(&reason, PFRES_SHORT); 6166 log = 1; 6167 goto done; 6168 } 6169 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 6170 DPFPRINTF(PF_DEBUG_MISC, 6171 ("pf: IPv6 rthdr0\n")); 6172 action = PF_DROP; 6173 REASON_SET(&reason, PFRES_IPOPTIONS); 6174 log = 1; 6175 goto done; 6176 } 6177 /* FALLTHROUGH */ 6178 } 6179 case IPPROTO_AH: 6180 case IPPROTO_HOPOPTS: 6181 case IPPROTO_DSTOPTS: { 6182 /* get next header and header length */ 6183 struct ip6_ext opt6; 6184 6185 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 6186 NULL, &reason, pd.af)) { 6187 DPFPRINTF(PF_DEBUG_MISC, 6188 ("pf: IPv6 short opt\n")); 6189 action = PF_DROP; 6190 log = 1; 6191 goto done; 6192 } 6193 if (pd.proto == IPPROTO_AH) 6194 off += (opt6.ip6e_len + 2) * 4; 6195 else 6196 off += (opt6.ip6e_len + 1) * 8; 6197 pd.proto = opt6.ip6e_nxt; 6198 /* goto the next header */ 6199 break; 6200 } 6201 default: 6202 terminal++; 6203 break; 6204 } 6205 } while (!terminal); 6206 6207 /* if there's no routing header, use unmodified mbuf for checksumming */ 6208 if (!n) 6209 n = m; 6210 6211 switch (pd.proto) { 6212 6213 case IPPROTO_TCP: { 6214 struct tcphdr th; 6215 6216 pd.hdr.tcp = &th; 6217 if (!pf_pull_hdr(m, off, &th, sizeof(th), 6218 &action, &reason, AF_INET6)) { 6219 log = action != PF_PASS; 6220 goto done; 6221 } 6222 pd.p_len = pd.tot_len - off - (th.th_off << 2); 6223 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6224 if (action == PF_DROP) 6225 goto done; 6226 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6227 &reason); 6228 if (action == PF_PASS) { 6229 if (pfsync_update_state_ptr != NULL) 6230 pfsync_update_state_ptr(s); 6231 r = s->rule.ptr; 6232 a = s->anchor.ptr; 6233 log = s->log; 6234 } else if (s == NULL) 6235 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6236 &a, &ruleset, inp); 6237 break; 6238 } 6239 6240 case IPPROTO_UDP: { 6241 struct udphdr uh; 6242 6243 pd.hdr.udp = &uh; 6244 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 6245 &action, &reason, AF_INET6)) { 6246 log = action != PF_PASS; 6247 goto done; 6248 } 6249 if (uh.uh_dport == 0 || 6250 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 6251 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 6252 action = PF_DROP; 6253 REASON_SET(&reason, PFRES_SHORT); 6254 goto done; 6255 } 6256 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6257 if (action == PF_PASS) { 6258 if (pfsync_update_state_ptr != NULL) 6259 pfsync_update_state_ptr(s); 6260 r = s->rule.ptr; 6261 a = s->anchor.ptr; 6262 log = s->log; 6263 } else if (s == NULL) 6264 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6265 &a, &ruleset, inp); 6266 break; 6267 } 6268 6269 case IPPROTO_ICMP: { 6270 action = PF_DROP; 6271 DPFPRINTF(PF_DEBUG_MISC, 6272 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 6273 goto done; 6274 } 6275 6276 case IPPROTO_ICMPV6: { 6277 struct icmp6_hdr ih; 6278 6279 pd.hdr.icmp6 = &ih; 6280 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 6281 &action, &reason, AF_INET6)) { 6282 log = action != PF_PASS; 6283 goto done; 6284 } 6285 action = pf_test_state_icmp(&s, dir, kif, 6286 m, off, h, &pd, &reason); 6287 if (action == PF_PASS) { 6288 if (pfsync_update_state_ptr != NULL) 6289 pfsync_update_state_ptr(s); 6290 r = s->rule.ptr; 6291 a = s->anchor.ptr; 6292 log = s->log; 6293 } else if (s == NULL) 6294 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6295 &a, &ruleset, inp); 6296 break; 6297 } 6298 6299 default: 6300 action = pf_test_state_other(&s, dir, kif, m, &pd); 6301 if (action == PF_PASS) { 6302 if (pfsync_update_state_ptr != NULL) 6303 pfsync_update_state_ptr(s); 6304 r = s->rule.ptr; 6305 a = s->anchor.ptr; 6306 log = s->log; 6307 } else if (s == NULL) 6308 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6309 &a, &ruleset, inp); 6310 break; 6311 } 6312 6313done: 6314 PF_RULES_RUNLOCK(); 6315 if (n != m) { 6316 m_freem(n); 6317 n = NULL; 6318 } 6319 6320 /* handle dangerous IPv6 extension headers. */ 6321 if (action == PF_PASS && rh_cnt && 6322 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6323 action = PF_DROP; 6324 REASON_SET(&reason, PFRES_IPOPTIONS); 6325 log = 1; 6326 DPFPRINTF(PF_DEBUG_MISC, 6327 ("pf: dropping packet with dangerous v6 headers\n")); 6328 } 6329 6330 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6331 action = PF_DROP; 6332 REASON_SET(&reason, PFRES_MEMORY); 6333 } 6334 if (r->rtableid >= 0) 6335 M_SETFIB(m, r->rtableid); 6336 6337#ifdef ALTQ 6338 if (action == PF_PASS && r->qid) { 6339 if (pd.pf_mtag == NULL && 6340 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6341 action = PF_DROP; 6342 REASON_SET(&reason, PFRES_MEMORY); 6343 } 6344 if (pd.tos & IPTOS_LOWDELAY) 6345 pd.pf_mtag->qid = r->pqid; 6346 else 6347 pd.pf_mtag->qid = r->qid; 6348 /* add hints for ecn */ 6349 pd.pf_mtag->hdr = h; 6350 } 6351#endif /* ALTQ */ 6352 6353 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6354 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6355 (s->nat_rule.ptr->action == PF_RDR || 6356 s->nat_rule.ptr->action == PF_BINAT) && 6357 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 6358 m->m_flags |= M_SKIP_FIREWALL; 6359 6360 /* XXX: Anybody working on it?! */ 6361 if (r->divert.port) 6362 printf("pf: divert(9) is not supported for IPv6\n"); 6363 6364 if (log) { 6365 struct pf_rule *lr; 6366 6367 if (s != NULL && s->nat_rule.ptr != NULL && 6368 s->nat_rule.ptr->log & PF_LOG_ALL) 6369 lr = s->nat_rule.ptr; 6370 else 6371 lr = r; 6372 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 6373 &pd, (s == NULL)); 6374 } 6375 6376 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 6377 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 6378 6379 if (action == PF_PASS || r->action == PF_DROP) { 6380 dirndx = (dir == PF_OUT); 6381 r->packets[dirndx]++; 6382 r->bytes[dirndx] += pd.tot_len; 6383 if (a != NULL) { 6384 a->packets[dirndx]++; 6385 a->bytes[dirndx] += pd.tot_len; 6386 } 6387 if (s != NULL) { 6388 if (s->nat_rule.ptr != NULL) { 6389 s->nat_rule.ptr->packets[dirndx]++; 6390 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 6391 } 6392 if (s->src_node != NULL) { 6393 s->src_node->packets[dirndx]++; 6394 s->src_node->bytes[dirndx] += pd.tot_len; 6395 } 6396 if (s->nat_src_node != NULL) { 6397 s->nat_src_node->packets[dirndx]++; 6398 s->nat_src_node->bytes[dirndx] += pd.tot_len; 6399 } 6400 dirndx = (dir == s->direction) ? 0 : 1; 6401 s->packets[dirndx]++; 6402 s->bytes[dirndx] += pd.tot_len; 6403 } 6404 tr = r; 6405 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6406 if (nr != NULL && r == &V_pf_default_rule) 6407 tr = nr; 6408 if (tr->src.addr.type == PF_ADDR_TABLE) 6409 pfr_update_stats(tr->src.addr.p.tbl, 6410 (s == NULL) ? pd.src : 6411 &s->key[(s->direction == PF_IN)]->addr[0], 6412 pd.af, pd.tot_len, dir == PF_OUT, 6413 r->action == PF_PASS, tr->src.neg); 6414 if (tr->dst.addr.type == PF_ADDR_TABLE) 6415 pfr_update_stats(tr->dst.addr.p.tbl, 6416 (s == NULL) ? pd.dst : 6417 &s->key[(s->direction == PF_IN)]->addr[1], 6418 pd.af, pd.tot_len, dir == PF_OUT, 6419 r->action == PF_PASS, tr->dst.neg); 6420 } 6421 6422 switch (action) { 6423 case PF_SYNPROXY_DROP: 6424 m_freem(*m0); 6425 case PF_DEFER: 6426 *m0 = NULL; 6427 action = PF_PASS; 6428 break; 6429 case PF_DROP: 6430 m_freem(*m0); 6431 *m0 = NULL; 6432 break; 6433 default: 6434 /* pf_route6() returns unlocked. */ 6435 if (r->rt) { 6436 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); 6437 return (action); 6438 } 6439 break; 6440 } 6441 6442 if (s) 6443 PF_STATE_UNLOCK(s); 6444 6445 /* If reassembled packet passed, create new fragments. */ 6446 if (action == PF_PASS && *m0 && fwdir == PF_FWD && 6447 (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL) 6448 action = pf_refragment6(ifp, m0, mtag); 6449 6450 return (action); 6451} 6452#endif /* INET6 */ 6453