1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2001 Daniel Hartmeier 5 * Copyright (c) 2002 - 2008 Henning Brauer 6 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * - Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * - Redistributions in binary form must reproduce the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer in the documentation and/or other materials provided 18 * with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 28 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 30 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 * 33 * Effort sponsored in part by the Defense Advanced Research Projects 34 * Agency (DARPA) and Air Force Research Laboratory, Air Force 35 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 36 * 37 * $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "opt_bpf.h" 44 #include "opt_inet.h" 45 #include "opt_inet6.h" 46 #include "opt_pf.h" 47 #include "opt_sctp.h" 48 49 #include <sys/param.h> 50 #include <sys/bus.h> 51 #include <sys/endian.h> 52 #include <sys/gsb_crc32.h> 53 #include <sys/hash.h> 54 #include <sys/interrupt.h> 55 #include <sys/kernel.h> 56 #include <sys/kthread.h> 57 #include <sys/limits.h> 58 #include <sys/mbuf.h> 59 #include <sys/md5.h> 60 #include <sys/random.h> 61 #include <sys/refcount.h> 62 #include <sys/sdt.h> 63 #include <sys/socket.h> 64 #include <sys/sysctl.h> 65 #include <sys/taskqueue.h> 66 #include <sys/ucred.h> 67 68 #include <net/if.h> 69 #include <net/if_var.h> 70 #include <net/if_private.h> 71 #include <net/if_types.h> 72 #include <net/if_vlan_var.h> 73 #include <net/route.h> 74 #include <net/route/nhop.h> 75 #include <net/vnet.h> 76 77 #include <net/pfil.h> 78 #include <net/pfvar.h> 79 #include <net/if_pflog.h> 80 #include <net/if_pfsync.h> 81 82 #include <netinet/in_pcb.h> 83 #include <netinet/in_var.h> 84 #include <netinet/in_fib.h> 85 #include <netinet/ip.h> 86 #include <netinet/ip_fw.h> 87 #include <netinet/ip_icmp.h> 88 #include <netinet/icmp_var.h> 89 #include <netinet/ip_var.h> 90 #include <netinet/tcp.h> 91 #include <netinet/tcp_fsm.h> 92 #include <netinet/tcp_seq.h> 93 #include <netinet/tcp_timer.h> 94 #include <netinet/tcp_var.h> 95 #include <netinet/udp.h> 96 #include <netinet/udp_var.h> 97 98 /* dummynet */ 99 #include <netinet/ip_dummynet.h> 100 #include <netinet/ip_fw.h> 101 #include <netpfil/ipfw/dn_heap.h> 102 #include <netpfil/ipfw/ip_fw_private.h> 103 #include <netpfil/ipfw/ip_dn_private.h> 104 105 #ifdef INET6 106 #include <netinet/ip6.h> 107 #include <netinet/icmp6.h> 108 #include <netinet6/nd6.h> 109 #include <netinet6/ip6_var.h> 110 #include <netinet6/in6_pcb.h> 111 #include <netinet6/in6_fib.h> 112 #include <netinet6/scope6_var.h> 113 #endif /* INET6 */ 114 115 #include <netinet/sctp_header.h> 116 #include <netinet/sctp_crc32.h> 117 118 #include <machine/in_cksum.h> 119 #include <security/mac/mac_framework.h> 120 121 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 122 123 SDT_PROVIDER_DEFINE(pf); 124 SDT_PROBE_DEFINE4(pf, ip, test, done, "int", "int", "struct pf_krule *", 125 "struct pf_kstate *"); 126 SDT_PROBE_DEFINE4(pf, ip, test6, done, "int", "int", "struct pf_krule *", 127 "struct pf_kstate *"); 128 SDT_PROBE_DEFINE5(pf, ip, state, lookup, "struct pfi_kkif *", 129 "struct pf_state_key_cmp *", "int", "struct pf_pdesc *", 130 "struct pf_kstate *"); 131 132 SDT_PROBE_DEFINE3(pf, eth, test_rule, entry, "int", "struct ifnet *", 133 "struct mbuf *"); 134 SDT_PROBE_DEFINE2(pf, eth, test_rule, test, "int", "struct pf_keth_rule *"); 135 SDT_PROBE_DEFINE3(pf, eth, test_rule, mismatch, 136 "int", "struct pf_keth_rule *", "char *"); 137 SDT_PROBE_DEFINE2(pf, eth, test_rule, match, "int", "struct pf_keth_rule *"); 138 SDT_PROBE_DEFINE2(pf, eth, test_rule, final_match, 139 "int", "struct pf_keth_rule *"); 140 141 /* 142 * Global variables 143 */ 144 145 /* state tables */ 146 VNET_DEFINE(struct pf_altqqueue, pf_altqs[4]); 147 VNET_DEFINE(struct pf_kpalist, pf_pabuf); 148 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 149 VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_active); 150 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 151 VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_inactive); 152 VNET_DEFINE(struct pf_kstatus, pf_status); 153 154 VNET_DEFINE(u_int32_t, ticket_altqs_active); 155 VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 156 VNET_DEFINE(int, altqs_inactive_open); 157 VNET_DEFINE(u_int32_t, ticket_pabuf); 158 159 VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 160 #define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 161 VNET_DEFINE(u_char, pf_tcp_secret[16]); 162 #define V_pf_tcp_secret VNET(pf_tcp_secret) 163 VNET_DEFINE(int, pf_tcp_secret_init); 164 #define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 165 VNET_DEFINE(int, pf_tcp_iss_off); 166 #define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 167 VNET_DECLARE(int, pf_vnet_active); 168 #define V_pf_vnet_active VNET(pf_vnet_active) 169 170 VNET_DEFINE_STATIC(uint32_t, pf_purge_idx); 171 #define V_pf_purge_idx VNET(pf_purge_idx) 172 173 #ifdef PF_WANT_32_TO_64_COUNTER 174 VNET_DEFINE_STATIC(uint32_t, pf_counter_periodic_iter); 175 #define V_pf_counter_periodic_iter VNET(pf_counter_periodic_iter) 176 177 VNET_DEFINE(struct allrulelist_head, pf_allrulelist); 178 VNET_DEFINE(size_t, pf_allrulecount); 179 VNET_DEFINE(struct pf_krule *, pf_rulemarker); 180 #endif 181 182 /* 183 * Queue for pf_intr() sends. 184 */ 185 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 186 struct pf_send_entry { 187 STAILQ_ENTRY(pf_send_entry) pfse_next; 188 struct mbuf *pfse_m; 189 enum { 190 PFSE_IP, 191 PFSE_IP6, 192 PFSE_ICMP, 193 PFSE_ICMP6, 194 } pfse_type; 195 struct { 196 int type; 197 int code; 198 int mtu; 199 } icmpopts; 200 }; 201 202 STAILQ_HEAD(pf_send_head, pf_send_entry); 203 VNET_DEFINE_STATIC(struct pf_send_head, pf_sendqueue); 204 #define V_pf_sendqueue VNET(pf_sendqueue) 205 206 static struct mtx_padalign pf_sendqueue_mtx; 207 MTX_SYSINIT(pf_sendqueue_mtx, &pf_sendqueue_mtx, "pf send queue", MTX_DEF); 208 #define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 209 #define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 210 211 /* 212 * Queue for pf_overload_task() tasks. 213 */ 214 struct pf_overload_entry { 215 SLIST_ENTRY(pf_overload_entry) next; 216 struct pf_addr addr; 217 sa_family_t af; 218 uint8_t dir; 219 struct pf_krule *rule; 220 }; 221 222 SLIST_HEAD(pf_overload_head, pf_overload_entry); 223 VNET_DEFINE_STATIC(struct pf_overload_head, pf_overloadqueue); 224 #define V_pf_overloadqueue VNET(pf_overloadqueue) 225 VNET_DEFINE_STATIC(struct task, pf_overloadtask); 226 #define V_pf_overloadtask VNET(pf_overloadtask) 227 228 static struct mtx_padalign pf_overloadqueue_mtx; 229 MTX_SYSINIT(pf_overloadqueue_mtx, &pf_overloadqueue_mtx, 230 "pf overload/flush queue", MTX_DEF); 231 #define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) 232 #define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) 233 234 VNET_DEFINE(struct pf_krulequeue, pf_unlinked_rules); 235 struct mtx_padalign pf_unlnkdrules_mtx; 236 MTX_SYSINIT(pf_unlnkdrules_mtx, &pf_unlnkdrules_mtx, "pf unlinked rules", 237 MTX_DEF); 238 239 struct sx pf_config_lock; 240 SX_SYSINIT(pf_config_lock, &pf_config_lock, "pf config"); 241 242 struct mtx_padalign pf_table_stats_lock; 243 MTX_SYSINIT(pf_table_stats_lock, &pf_table_stats_lock, "pf table stats", 244 MTX_DEF); 245 246 VNET_DEFINE_STATIC(uma_zone_t, pf_sources_z); 247 #define V_pf_sources_z VNET(pf_sources_z) 248 uma_zone_t pf_mtag_z; 249 VNET_DEFINE(uma_zone_t, pf_state_z); 250 VNET_DEFINE(uma_zone_t, pf_state_key_z); 251 252 VNET_DEFINE(struct unrhdr64, pf_stateid); 253 254 static void pf_src_tree_remove_state(struct pf_kstate *); 255 static void pf_init_threshold(struct pf_threshold *, u_int32_t, 256 u_int32_t); 257 static void pf_add_threshold(struct pf_threshold *); 258 static int pf_check_threshold(struct pf_threshold *); 259 260 static void pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *, 261 u_int16_t *, u_int16_t *, struct pf_addr *, 262 u_int16_t, u_int8_t, sa_family_t); 263 static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 264 struct tcphdr *, struct pf_state_peer *); 265 static void pf_change_icmp(struct pf_addr *, u_int16_t *, 266 struct pf_addr *, struct pf_addr *, u_int16_t, 267 u_int16_t *, u_int16_t *, u_int16_t *, 268 u_int16_t *, u_int8_t, sa_family_t); 269 static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 270 sa_family_t, struct pf_krule *, int); 271 static void pf_detach_state(struct pf_kstate *); 272 static int pf_state_key_attach(struct pf_state_key *, 273 struct pf_state_key *, struct pf_kstate *); 274 static void pf_state_key_detach(struct pf_kstate *, int); 275 static int pf_state_key_ctor(void *, int, void *, int); 276 static u_int32_t pf_tcp_iss(struct pf_pdesc *); 277 static int pf_dummynet(struct pf_pdesc *, struct pf_kstate *, 278 struct pf_krule *, struct mbuf **); 279 static int pf_dummynet_route(struct pf_pdesc *, 280 struct pf_kstate *, struct pf_krule *, 281 struct ifnet *, struct sockaddr *, struct mbuf **); 282 static int pf_test_eth_rule(int, struct pfi_kkif *, 283 struct mbuf **); 284 static int pf_test_rule(struct pf_krule **, struct pf_kstate **, 285 struct pfi_kkif *, struct mbuf *, int, 286 struct pf_pdesc *, struct pf_krule **, 287 struct pf_kruleset **, struct inpcb *); 288 static int pf_create_state(struct pf_krule *, struct pf_krule *, 289 struct pf_krule *, struct pf_pdesc *, 290 struct pf_ksrc_node *, struct pf_state_key *, 291 struct pf_state_key *, struct mbuf *, int, 292 u_int16_t, u_int16_t, int *, struct pfi_kkif *, 293 struct pf_kstate **, int, u_int16_t, u_int16_t, 294 int, struct pf_krule_slist *); 295 static int pf_test_fragment(struct pf_krule **, struct pfi_kkif *, 296 struct mbuf *, void *, struct pf_pdesc *, 297 struct pf_krule **, struct pf_kruleset **); 298 static int pf_tcp_track_full(struct pf_kstate **, 299 struct pfi_kkif *, struct mbuf *, int, 300 struct pf_pdesc *, u_short *, int *); 301 static int pf_tcp_track_sloppy(struct pf_kstate **, 302 struct pf_pdesc *, u_short *); 303 static int pf_test_state_tcp(struct pf_kstate **, 304 struct pfi_kkif *, struct mbuf *, int, 305 void *, struct pf_pdesc *, u_short *); 306 static int pf_test_state_udp(struct pf_kstate **, 307 struct pfi_kkif *, struct mbuf *, int, 308 void *, struct pf_pdesc *); 309 static int pf_test_state_icmp(struct pf_kstate **, 310 struct pfi_kkif *, struct mbuf *, int, 311 void *, struct pf_pdesc *, u_short *); 312 static int pf_test_state_sctp(struct pf_kstate **, 313 struct pfi_kkif *, struct mbuf *, int, 314 void *, struct pf_pdesc *, u_short *); 315 static int pf_test_state_other(struct pf_kstate **, 316 struct pfi_kkif *, struct mbuf *, struct pf_pdesc *); 317 static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 318 int, u_int16_t); 319 static int pf_check_proto_cksum(struct mbuf *, int, int, 320 u_int8_t, sa_family_t); 321 static void pf_print_state_parts(struct pf_kstate *, 322 struct pf_state_key *, struct pf_state_key *); 323 static void pf_patch_8(struct mbuf *, u_int16_t *, u_int8_t *, u_int8_t, 324 bool, u_int8_t); 325 static struct pf_kstate *pf_find_state(struct pfi_kkif *, 326 struct pf_state_key_cmp *, u_int); 327 static int pf_src_connlimit(struct pf_kstate **); 328 static void pf_overload_task(void *v, int pending); 329 static u_short pf_insert_src_node(struct pf_ksrc_node **, 330 struct pf_krule *, struct pf_addr *, sa_family_t); 331 static u_int pf_purge_expired_states(u_int, int); 332 static void pf_purge_unlinked_rules(void); 333 static int pf_mtag_uminit(void *, int, int); 334 static void pf_mtag_free(struct m_tag *); 335 static void pf_packet_rework_nat(struct mbuf *, struct pf_pdesc *, 336 int, struct pf_state_key *); 337 #ifdef INET 338 static void pf_route(struct mbuf **, struct pf_krule *, 339 struct ifnet *, struct pf_kstate *, 340 struct pf_pdesc *, struct inpcb *); 341 #endif /* INET */ 342 #ifdef INET6 343 static void pf_change_a6(struct pf_addr *, u_int16_t *, 344 struct pf_addr *, u_int8_t); 345 static void pf_route6(struct mbuf **, struct pf_krule *, 346 struct ifnet *, struct pf_kstate *, 347 struct pf_pdesc *, struct inpcb *); 348 #endif /* INET6 */ 349 static __inline void pf_set_protostate(struct pf_kstate *, int, u_int8_t); 350 351 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 352 353 extern int pf_end_threads; 354 extern struct proc *pf_purge_proc; 355 356 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 357 358 #define PACKET_UNDO_NAT(_m, _pd, _off, _s) \ 359 do { \ 360 struct pf_state_key *nk; \ 361 if ((pd->dir) == PF_OUT) \ 362 nk = (_s)->key[PF_SK_STACK]; \ 363 else \ 364 nk = (_s)->key[PF_SK_WIRE]; \ 365 pf_packet_rework_nat(_m, _pd, _off, nk); \ 366 } while (0) 367 368 #define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 369 (pd)->pf_mtag->flags & PF_MTAG_FLAG_PACKET_LOOPED) 370 371 #define STATE_LOOKUP(i, k, s, pd) \ 372 do { \ 373 (s) = pf_find_state((i), (k), (pd->dir)); \ 374 SDT_PROBE5(pf, ip, state, lookup, i, k, (pd->dir), pd, (s)); \ 375 if ((s) == NULL) \ 376 return (PF_DROP); \ 377 if (PACKET_LOOPED(pd)) \ 378 return (PF_PASS); \ 379 } while (0) 380 381 #define BOUND_IFACE(r, k) \ 382 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 383 384 #define STATE_INC_COUNTERS(s) \ 385 do { \ 386 struct pf_krule_item *mrm; \ 387 counter_u64_add(s->rule.ptr->states_cur, 1); \ 388 counter_u64_add(s->rule.ptr->states_tot, 1); \ 389 if (s->anchor.ptr != NULL) { \ 390 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 391 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 392 } \ 393 if (s->nat_rule.ptr != NULL) { \ 394 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 395 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 396 } \ 397 SLIST_FOREACH(mrm, &s->match_rules, entry) { \ 398 counter_u64_add(mrm->r->states_cur, 1); \ 399 counter_u64_add(mrm->r->states_tot, 1); \ 400 } \ 401 } while (0) 402 403 #define STATE_DEC_COUNTERS(s) \ 404 do { \ 405 struct pf_krule_item *mrm; \ 406 if (s->nat_rule.ptr != NULL) \ 407 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 408 if (s->anchor.ptr != NULL) \ 409 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 410 counter_u64_add(s->rule.ptr->states_cur, -1); \ 411 SLIST_FOREACH(mrm, &s->match_rules, entry) \ 412 counter_u64_add(mrm->r->states_cur, -1); \ 413 } while (0) 414 415 MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 416 MALLOC_DEFINE(M_PF_RULE_ITEM, "pf_krule_item", "pf(4) rule items"); 417 VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 418 VNET_DEFINE(struct pf_idhash *, pf_idhash); 419 VNET_DEFINE(struct pf_srchash *, pf_srchash); 420 421 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 422 "pf(4)"); 423 424 u_long pf_hashmask; 425 u_long pf_srchashmask; 426 static u_long pf_hashsize; 427 static u_long pf_srchashsize; 428 u_long pf_ioctl_maxcount = 65535; 429 430 SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 431 &pf_hashsize, 0, "Size of pf(4) states hashtable"); 432 SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 433 &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable"); 434 SYSCTL_ULONG(_net_pf, OID_AUTO, request_maxcount, CTLFLAG_RWTUN, 435 &pf_ioctl_maxcount, 0, "Maximum number of tables, addresses, ... in a single ioctl() call"); 436 437 VNET_DEFINE(void *, pf_swi_cookie); 438 VNET_DEFINE(struct intr_event *, pf_swi_ie); 439 440 VNET_DEFINE(uint32_t, pf_hashseed); 441 #define V_pf_hashseed VNET(pf_hashseed) 442 443 static void 444 pf_sctp_checksum(struct mbuf *m, int off) 445 { 446 uint32_t sum = 0; 447 448 /* Zero out the checksum, to enable recalculation. */ 449 m_copyback(m, off + offsetof(struct sctphdr, checksum), 450 sizeof(sum), (caddr_t)&sum); 451 452 sum = sctp_calculate_cksum(m, off); 453 454 m_copyback(m, off + offsetof(struct sctphdr, checksum), 455 sizeof(sum), (caddr_t)&sum); 456 } 457 458 int 459 pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af) 460 { 461 462 switch (af) { 463 #ifdef INET 464 case AF_INET: 465 if (a->addr32[0] > b->addr32[0]) 466 return (1); 467 if (a->addr32[0] < b->addr32[0]) 468 return (-1); 469 break; 470 #endif /* INET */ 471 #ifdef INET6 472 case AF_INET6: 473 if (a->addr32[3] > b->addr32[3]) 474 return (1); 475 if (a->addr32[3] < b->addr32[3]) 476 return (-1); 477 if (a->addr32[2] > b->addr32[2]) 478 return (1); 479 if (a->addr32[2] < b->addr32[2]) 480 return (-1); 481 if (a->addr32[1] > b->addr32[1]) 482 return (1); 483 if (a->addr32[1] < b->addr32[1]) 484 return (-1); 485 if (a->addr32[0] > b->addr32[0]) 486 return (1); 487 if (a->addr32[0] < b->addr32[0]) 488 return (-1); 489 break; 490 #endif /* INET6 */ 491 default: 492 panic("%s: unknown address family %u", __func__, af); 493 } 494 return (0); 495 } 496 497 static void 498 pf_packet_rework_nat(struct mbuf *m, struct pf_pdesc *pd, int off, 499 struct pf_state_key *nk) 500 { 501 502 switch (pd->proto) { 503 case IPPROTO_TCP: { 504 struct tcphdr *th = &pd->hdr.tcp; 505 506 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) 507 pf_change_ap(m, pd->src, &th->th_sport, pd->ip_sum, 508 &th->th_sum, &nk->addr[pd->sidx], 509 nk->port[pd->sidx], 0, pd->af); 510 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) 511 pf_change_ap(m, pd->dst, &th->th_dport, pd->ip_sum, 512 &th->th_sum, &nk->addr[pd->didx], 513 nk->port[pd->didx], 0, pd->af); 514 m_copyback(m, off, sizeof(*th), (caddr_t)th); 515 break; 516 } 517 case IPPROTO_UDP: { 518 struct udphdr *uh = &pd->hdr.udp; 519 520 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) 521 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 522 &uh->uh_sum, &nk->addr[pd->sidx], 523 nk->port[pd->sidx], 1, pd->af); 524 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) 525 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 526 &uh->uh_sum, &nk->addr[pd->didx], 527 nk->port[pd->didx], 1, pd->af); 528 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 529 break; 530 } 531 case IPPROTO_SCTP: { 532 struct sctphdr *sh = &pd->hdr.sctp; 533 uint16_t checksum = 0; 534 535 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) { 536 pf_change_ap(m, pd->src, &sh->src_port, pd->ip_sum, 537 &checksum, &nk->addr[pd->sidx], 538 nk->port[pd->sidx], 1, pd->af); 539 } 540 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) { 541 pf_change_ap(m, pd->dst, &sh->dest_port, pd->ip_sum, 542 &checksum, &nk->addr[pd->didx], 543 nk->port[pd->didx], 1, pd->af); 544 } 545 546 break; 547 } 548 case IPPROTO_ICMP: { 549 struct icmp *ih = &pd->hdr.icmp; 550 551 if (nk->port[pd->sidx] != ih->icmp_id) { 552 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( 553 ih->icmp_cksum, ih->icmp_id, 554 nk->port[pd->sidx], 0); 555 ih->icmp_id = nk->port[pd->sidx]; 556 pd->sport = &ih->icmp_id; 557 558 m_copyback(m, off, ICMP_MINLEN, (caddr_t)ih); 559 } 560 /* FALLTHROUGH */ 561 } 562 default: 563 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) { 564 switch (pd->af) { 565 case AF_INET: 566 pf_change_a(&pd->src->v4.s_addr, 567 pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 568 0); 569 break; 570 case AF_INET6: 571 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 572 break; 573 } 574 } 575 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) { 576 switch (pd->af) { 577 case AF_INET: 578 pf_change_a(&pd->dst->v4.s_addr, 579 pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 580 0); 581 break; 582 case AF_INET6: 583 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 584 break; 585 } 586 } 587 break; 588 } 589 } 590 591 static __inline uint32_t 592 pf_hashkey(struct pf_state_key *sk) 593 { 594 uint32_t h; 595 596 h = murmur3_32_hash32((uint32_t *)sk, 597 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 598 V_pf_hashseed); 599 600 return (h & pf_hashmask); 601 } 602 603 static __inline uint32_t 604 pf_hashsrc(struct pf_addr *addr, sa_family_t af) 605 { 606 uint32_t h; 607 608 switch (af) { 609 case AF_INET: 610 h = murmur3_32_hash32((uint32_t *)&addr->v4, 611 sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed); 612 break; 613 case AF_INET6: 614 h = murmur3_32_hash32((uint32_t *)&addr->v6, 615 sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed); 616 break; 617 default: 618 panic("%s: unknown address family %u", __func__, af); 619 } 620 621 return (h & pf_srchashmask); 622 } 623 624 #ifdef ALTQ 625 static int 626 pf_state_hash(struct pf_kstate *s) 627 { 628 u_int32_t hv = (intptr_t)s / sizeof(*s); 629 630 hv ^= crc32(&s->src, sizeof(s->src)); 631 hv ^= crc32(&s->dst, sizeof(s->dst)); 632 if (hv == 0) 633 hv = 1; 634 return (hv); 635 } 636 #endif 637 638 static __inline void 639 pf_set_protostate(struct pf_kstate *s, int which, u_int8_t newstate) 640 { 641 if (which == PF_PEER_DST || which == PF_PEER_BOTH) 642 s->dst.state = newstate; 643 if (which == PF_PEER_DST) 644 return; 645 if (s->src.state == newstate) 646 return; 647 if (s->creatorid == V_pf_status.hostid && 648 s->key[PF_SK_STACK] != NULL && 649 s->key[PF_SK_STACK]->proto == IPPROTO_TCP && 650 !(TCPS_HAVEESTABLISHED(s->src.state) || 651 s->src.state == TCPS_CLOSED) && 652 (TCPS_HAVEESTABLISHED(newstate) || newstate == TCPS_CLOSED)) 653 atomic_add_32(&V_pf_status.states_halfopen, -1); 654 655 s->src.state = newstate; 656 } 657 658 #ifdef INET6 659 void 660 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 661 { 662 switch (af) { 663 #ifdef INET 664 case AF_INET: 665 dst->addr32[0] = src->addr32[0]; 666 break; 667 #endif /* INET */ 668 case AF_INET6: 669 dst->addr32[0] = src->addr32[0]; 670 dst->addr32[1] = src->addr32[1]; 671 dst->addr32[2] = src->addr32[2]; 672 dst->addr32[3] = src->addr32[3]; 673 break; 674 } 675 } 676 #endif /* INET6 */ 677 678 static void 679 pf_init_threshold(struct pf_threshold *threshold, 680 u_int32_t limit, u_int32_t seconds) 681 { 682 threshold->limit = limit * PF_THRESHOLD_MULT; 683 threshold->seconds = seconds; 684 threshold->count = 0; 685 threshold->last = time_uptime; 686 } 687 688 static void 689 pf_add_threshold(struct pf_threshold *threshold) 690 { 691 u_int32_t t = time_uptime, diff = t - threshold->last; 692 693 if (diff >= threshold->seconds) 694 threshold->count = 0; 695 else 696 threshold->count -= threshold->count * diff / 697 threshold->seconds; 698 threshold->count += PF_THRESHOLD_MULT; 699 threshold->last = t; 700 } 701 702 static int 703 pf_check_threshold(struct pf_threshold *threshold) 704 { 705 return (threshold->count > threshold->limit); 706 } 707 708 static int 709 pf_src_connlimit(struct pf_kstate **state) 710 { 711 struct pf_overload_entry *pfoe; 712 int bad = 0; 713 714 PF_STATE_LOCK_ASSERT(*state); 715 /* 716 * XXXKS: The src node is accessed unlocked! 717 * PF_SRC_NODE_LOCK_ASSERT((*state)->src_node); 718 */ 719 720 (*state)->src_node->conn++; 721 (*state)->src.tcp_est = 1; 722 pf_add_threshold(&(*state)->src_node->conn_rate); 723 724 if ((*state)->rule.ptr->max_src_conn && 725 (*state)->rule.ptr->max_src_conn < 726 (*state)->src_node->conn) { 727 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 728 bad++; 729 } 730 731 if ((*state)->rule.ptr->max_src_conn_rate.limit && 732 pf_check_threshold(&(*state)->src_node->conn_rate)) { 733 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 734 bad++; 735 } 736 737 if (!bad) 738 return (0); 739 740 /* Kill this state. */ 741 (*state)->timeout = PFTM_PURGE; 742 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED); 743 744 if ((*state)->rule.ptr->overload_tbl == NULL) 745 return (1); 746 747 /* Schedule overloading and flushing task. */ 748 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 749 if (pfoe == NULL) 750 return (1); /* too bad :( */ 751 752 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 753 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 754 pfoe->rule = (*state)->rule.ptr; 755 pfoe->dir = (*state)->direction; 756 PF_OVERLOADQ_LOCK(); 757 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 758 PF_OVERLOADQ_UNLOCK(); 759 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 760 761 return (1); 762 } 763 764 static void 765 pf_overload_task(void *v, int pending) 766 { 767 struct pf_overload_head queue; 768 struct pfr_addr p; 769 struct pf_overload_entry *pfoe, *pfoe1; 770 uint32_t killed = 0; 771 772 CURVNET_SET((struct vnet *)v); 773 774 PF_OVERLOADQ_LOCK(); 775 queue = V_pf_overloadqueue; 776 SLIST_INIT(&V_pf_overloadqueue); 777 PF_OVERLOADQ_UNLOCK(); 778 779 bzero(&p, sizeof(p)); 780 SLIST_FOREACH(pfoe, &queue, next) { 781 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 782 if (V_pf_status.debug >= PF_DEBUG_MISC) { 783 printf("%s: blocking address ", __func__); 784 pf_print_host(&pfoe->addr, 0, pfoe->af); 785 printf("\n"); 786 } 787 788 p.pfra_af = pfoe->af; 789 switch (pfoe->af) { 790 #ifdef INET 791 case AF_INET: 792 p.pfra_net = 32; 793 p.pfra_ip4addr = pfoe->addr.v4; 794 break; 795 #endif 796 #ifdef INET6 797 case AF_INET6: 798 p.pfra_net = 128; 799 p.pfra_ip6addr = pfoe->addr.v6; 800 break; 801 #endif 802 } 803 804 PF_RULES_WLOCK(); 805 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 806 PF_RULES_WUNLOCK(); 807 } 808 809 /* 810 * Remove those entries, that don't need flushing. 811 */ 812 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 813 if (pfoe->rule->flush == 0) { 814 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 815 free(pfoe, M_PFTEMP); 816 } else 817 counter_u64_add( 818 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 819 820 /* If nothing to flush, return. */ 821 if (SLIST_EMPTY(&queue)) { 822 CURVNET_RESTORE(); 823 return; 824 } 825 826 for (int i = 0; i <= pf_hashmask; i++) { 827 struct pf_idhash *ih = &V_pf_idhash[i]; 828 struct pf_state_key *sk; 829 struct pf_kstate *s; 830 831 PF_HASHROW_LOCK(ih); 832 LIST_FOREACH(s, &ih->states, entry) { 833 sk = s->key[PF_SK_WIRE]; 834 SLIST_FOREACH(pfoe, &queue, next) 835 if (sk->af == pfoe->af && 836 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 837 pfoe->rule == s->rule.ptr) && 838 ((pfoe->dir == PF_OUT && 839 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 840 (pfoe->dir == PF_IN && 841 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 842 s->timeout = PFTM_PURGE; 843 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED); 844 killed++; 845 } 846 } 847 PF_HASHROW_UNLOCK(ih); 848 } 849 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 850 free(pfoe, M_PFTEMP); 851 if (V_pf_status.debug >= PF_DEBUG_MISC) 852 printf("%s: %u states killed", __func__, killed); 853 854 CURVNET_RESTORE(); 855 } 856 857 /* 858 * Can return locked on failure, so that we can consistently 859 * allocate and insert a new one. 860 */ 861 struct pf_ksrc_node * 862 pf_find_src_node(struct pf_addr *src, struct pf_krule *rule, sa_family_t af, 863 struct pf_srchash **sh, bool returnlocked) 864 { 865 struct pf_ksrc_node *n; 866 867 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 868 869 *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 870 PF_HASHROW_LOCK(*sh); 871 LIST_FOREACH(n, &(*sh)->nodes, entry) 872 if (n->rule.ptr == rule && n->af == af && 873 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 874 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 875 break; 876 877 if (n != NULL) { 878 n->states++; 879 PF_HASHROW_UNLOCK(*sh); 880 } else if (returnlocked == false) 881 PF_HASHROW_UNLOCK(*sh); 882 883 return (n); 884 } 885 886 static void 887 pf_free_src_node(struct pf_ksrc_node *sn) 888 { 889 890 for (int i = 0; i < 2; i++) { 891 counter_u64_free(sn->bytes[i]); 892 counter_u64_free(sn->packets[i]); 893 } 894 uma_zfree(V_pf_sources_z, sn); 895 } 896 897 static u_short 898 pf_insert_src_node(struct pf_ksrc_node **sn, struct pf_krule *rule, 899 struct pf_addr *src, sa_family_t af) 900 { 901 u_short reason = 0; 902 struct pf_srchash *sh = NULL; 903 904 KASSERT((rule->rule_flag & PFRULE_SRCTRACK || 905 rule->rpool.opts & PF_POOL_STICKYADDR), 906 ("%s for non-tracking rule %p", __func__, rule)); 907 908 if (*sn == NULL) 909 *sn = pf_find_src_node(src, rule, af, &sh, true); 910 911 if (*sn == NULL) { 912 PF_HASHROW_ASSERT(sh); 913 914 if (rule->max_src_nodes && 915 counter_u64_fetch(rule->src_nodes) >= rule->max_src_nodes) { 916 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 1); 917 PF_HASHROW_UNLOCK(sh); 918 reason = PFRES_SRCLIMIT; 919 goto done; 920 } 921 922 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 923 if ((*sn) == NULL) { 924 PF_HASHROW_UNLOCK(sh); 925 reason = PFRES_MEMORY; 926 goto done; 927 } 928 929 for (int i = 0; i < 2; i++) { 930 (*sn)->bytes[i] = counter_u64_alloc(M_NOWAIT); 931 (*sn)->packets[i] = counter_u64_alloc(M_NOWAIT); 932 933 if ((*sn)->bytes[i] == NULL || (*sn)->packets[i] == NULL) { 934 pf_free_src_node(*sn); 935 PF_HASHROW_UNLOCK(sh); 936 reason = PFRES_MEMORY; 937 goto done; 938 } 939 } 940 941 pf_init_threshold(&(*sn)->conn_rate, 942 rule->max_src_conn_rate.limit, 943 rule->max_src_conn_rate.seconds); 944 945 MPASS((*sn)->lock == NULL); 946 (*sn)->lock = &sh->lock; 947 948 (*sn)->af = af; 949 (*sn)->rule.ptr = rule; 950 PF_ACPY(&(*sn)->addr, src, af); 951 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 952 (*sn)->creation = time_uptime; 953 (*sn)->ruletype = rule->action; 954 (*sn)->states = 1; 955 if ((*sn)->rule.ptr != NULL) 956 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 957 PF_HASHROW_UNLOCK(sh); 958 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 959 } else { 960 if (rule->max_src_states && 961 (*sn)->states >= rule->max_src_states) { 962 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 963 1); 964 reason = PFRES_SRCLIMIT; 965 goto done; 966 } 967 } 968 done: 969 return (reason); 970 } 971 972 void 973 pf_unlink_src_node(struct pf_ksrc_node *src) 974 { 975 PF_SRC_NODE_LOCK_ASSERT(src); 976 977 LIST_REMOVE(src, entry); 978 if (src->rule.ptr) 979 counter_u64_add(src->rule.ptr->src_nodes, -1); 980 } 981 982 u_int 983 pf_free_src_nodes(struct pf_ksrc_node_list *head) 984 { 985 struct pf_ksrc_node *sn, *tmp; 986 u_int count = 0; 987 988 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 989 pf_free_src_node(sn); 990 count++; 991 } 992 993 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count); 994 995 return (count); 996 } 997 998 void 999 pf_mtag_initialize(void) 1000 { 1001 1002 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 1003 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 1004 UMA_ALIGN_PTR, 0); 1005 } 1006 1007 /* Per-vnet data storage structures initialization. */ 1008 void 1009 pf_initialize(void) 1010 { 1011 struct pf_keyhash *kh; 1012 struct pf_idhash *ih; 1013 struct pf_srchash *sh; 1014 u_int i; 1015 1016 if (pf_hashsize == 0 || !powerof2(pf_hashsize)) 1017 pf_hashsize = PF_HASHSIZ; 1018 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) 1019 pf_srchashsize = PF_SRCHASHSIZ; 1020 1021 V_pf_hashseed = arc4random(); 1022 1023 /* States and state keys storage. */ 1024 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_kstate), 1025 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 1026 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 1027 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 1028 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 1029 1030 V_pf_state_key_z = uma_zcreate("pf state keys", 1031 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 1032 UMA_ALIGN_PTR, 0); 1033 1034 V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash), 1035 M_PFHASH, M_NOWAIT | M_ZERO); 1036 V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash), 1037 M_PFHASH, M_NOWAIT | M_ZERO); 1038 if (V_pf_keyhash == NULL || V_pf_idhash == NULL) { 1039 printf("pf: Unable to allocate memory for " 1040 "state_hashsize %lu.\n", pf_hashsize); 1041 1042 free(V_pf_keyhash, M_PFHASH); 1043 free(V_pf_idhash, M_PFHASH); 1044 1045 pf_hashsize = PF_HASHSIZ; 1046 V_pf_keyhash = mallocarray(pf_hashsize, 1047 sizeof(struct pf_keyhash), M_PFHASH, M_WAITOK | M_ZERO); 1048 V_pf_idhash = mallocarray(pf_hashsize, 1049 sizeof(struct pf_idhash), M_PFHASH, M_WAITOK | M_ZERO); 1050 } 1051 1052 pf_hashmask = pf_hashsize - 1; 1053 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 1054 i++, kh++, ih++) { 1055 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 1056 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 1057 } 1058 1059 /* Source nodes. */ 1060 V_pf_sources_z = uma_zcreate("pf source nodes", 1061 sizeof(struct pf_ksrc_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 1062 0); 1063 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 1064 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 1065 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 1066 1067 V_pf_srchash = mallocarray(pf_srchashsize, 1068 sizeof(struct pf_srchash), M_PFHASH, M_NOWAIT | M_ZERO); 1069 if (V_pf_srchash == NULL) { 1070 printf("pf: Unable to allocate memory for " 1071 "source_hashsize %lu.\n", pf_srchashsize); 1072 1073 pf_srchashsize = PF_SRCHASHSIZ; 1074 V_pf_srchash = mallocarray(pf_srchashsize, 1075 sizeof(struct pf_srchash), M_PFHASH, M_WAITOK | M_ZERO); 1076 } 1077 1078 pf_srchashmask = pf_srchashsize - 1; 1079 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) 1080 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 1081 1082 /* ALTQ */ 1083 TAILQ_INIT(&V_pf_altqs[0]); 1084 TAILQ_INIT(&V_pf_altqs[1]); 1085 TAILQ_INIT(&V_pf_altqs[2]); 1086 TAILQ_INIT(&V_pf_altqs[3]); 1087 TAILQ_INIT(&V_pf_pabuf); 1088 V_pf_altqs_active = &V_pf_altqs[0]; 1089 V_pf_altq_ifs_active = &V_pf_altqs[1]; 1090 V_pf_altqs_inactive = &V_pf_altqs[2]; 1091 V_pf_altq_ifs_inactive = &V_pf_altqs[3]; 1092 1093 /* Send & overload+flush queues. */ 1094 STAILQ_INIT(&V_pf_sendqueue); 1095 SLIST_INIT(&V_pf_overloadqueue); 1096 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 1097 1098 /* Unlinked, but may be referenced rules. */ 1099 TAILQ_INIT(&V_pf_unlinked_rules); 1100 } 1101 1102 void 1103 pf_mtag_cleanup(void) 1104 { 1105 1106 uma_zdestroy(pf_mtag_z); 1107 } 1108 1109 void 1110 pf_cleanup(void) 1111 { 1112 struct pf_keyhash *kh; 1113 struct pf_idhash *ih; 1114 struct pf_srchash *sh; 1115 struct pf_send_entry *pfse, *next; 1116 u_int i; 1117 1118 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 1119 i++, kh++, ih++) { 1120 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 1121 __func__)); 1122 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 1123 __func__)); 1124 mtx_destroy(&kh->lock); 1125 mtx_destroy(&ih->lock); 1126 } 1127 free(V_pf_keyhash, M_PFHASH); 1128 free(V_pf_idhash, M_PFHASH); 1129 1130 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1131 KASSERT(LIST_EMPTY(&sh->nodes), 1132 ("%s: source node hash not empty", __func__)); 1133 mtx_destroy(&sh->lock); 1134 } 1135 free(V_pf_srchash, M_PFHASH); 1136 1137 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 1138 m_freem(pfse->pfse_m); 1139 free(pfse, M_PFTEMP); 1140 } 1141 1142 uma_zdestroy(V_pf_sources_z); 1143 uma_zdestroy(V_pf_state_z); 1144 uma_zdestroy(V_pf_state_key_z); 1145 } 1146 1147 static int 1148 pf_mtag_uminit(void *mem, int size, int how) 1149 { 1150 struct m_tag *t; 1151 1152 t = (struct m_tag *)mem; 1153 t->m_tag_cookie = MTAG_ABI_COMPAT; 1154 t->m_tag_id = PACKET_TAG_PF; 1155 t->m_tag_len = sizeof(struct pf_mtag); 1156 t->m_tag_free = pf_mtag_free; 1157 1158 return (0); 1159 } 1160 1161 static void 1162 pf_mtag_free(struct m_tag *t) 1163 { 1164 1165 uma_zfree(pf_mtag_z, t); 1166 } 1167 1168 struct pf_mtag * 1169 pf_get_mtag(struct mbuf *m) 1170 { 1171 struct m_tag *mtag; 1172 1173 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 1174 return ((struct pf_mtag *)(mtag + 1)); 1175 1176 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 1177 if (mtag == NULL) 1178 return (NULL); 1179 bzero(mtag + 1, sizeof(struct pf_mtag)); 1180 m_tag_prepend(m, mtag); 1181 1182 return ((struct pf_mtag *)(mtag + 1)); 1183 } 1184 1185 static int 1186 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 1187 struct pf_kstate *s) 1188 { 1189 struct pf_keyhash *khs, *khw, *kh; 1190 struct pf_state_key *sk, *cur; 1191 struct pf_kstate *si, *olds = NULL; 1192 int idx; 1193 1194 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1195 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 1196 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 1197 1198 /* 1199 * We need to lock hash slots of both keys. To avoid deadlock 1200 * we always lock the slot with lower address first. Unlock order 1201 * isn't important. 1202 * 1203 * We also need to lock ID hash slot before dropping key 1204 * locks. On success we return with ID hash slot locked. 1205 */ 1206 1207 if (skw == sks) { 1208 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 1209 PF_HASHROW_LOCK(khs); 1210 } else { 1211 khs = &V_pf_keyhash[pf_hashkey(sks)]; 1212 khw = &V_pf_keyhash[pf_hashkey(skw)]; 1213 if (khs == khw) { 1214 PF_HASHROW_LOCK(khs); 1215 } else if (khs < khw) { 1216 PF_HASHROW_LOCK(khs); 1217 PF_HASHROW_LOCK(khw); 1218 } else { 1219 PF_HASHROW_LOCK(khw); 1220 PF_HASHROW_LOCK(khs); 1221 } 1222 } 1223 1224 #define KEYS_UNLOCK() do { \ 1225 if (khs != khw) { \ 1226 PF_HASHROW_UNLOCK(khs); \ 1227 PF_HASHROW_UNLOCK(khw); \ 1228 } else \ 1229 PF_HASHROW_UNLOCK(khs); \ 1230 } while (0) 1231 1232 /* 1233 * First run: start with wire key. 1234 */ 1235 sk = skw; 1236 kh = khw; 1237 idx = PF_SK_WIRE; 1238 1239 MPASS(s->lock == NULL); 1240 s->lock = &V_pf_idhash[PF_IDHASH(s)].lock; 1241 1242 keyattach: 1243 LIST_FOREACH(cur, &kh->keys, entry) 1244 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 1245 break; 1246 1247 if (cur != NULL) { 1248 /* Key exists. Check for same kif, if none, add to key. */ 1249 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 1250 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 1251 1252 PF_HASHROW_LOCK(ih); 1253 if (si->kif == s->kif && 1254 si->direction == s->direction) { 1255 if (sk->proto == IPPROTO_TCP && 1256 si->src.state >= TCPS_FIN_WAIT_2 && 1257 si->dst.state >= TCPS_FIN_WAIT_2) { 1258 /* 1259 * New state matches an old >FIN_WAIT_2 1260 * state. We can't drop key hash locks, 1261 * thus we can't unlink it properly. 1262 * 1263 * As a workaround we drop it into 1264 * TCPS_CLOSED state, schedule purge 1265 * ASAP and push it into the very end 1266 * of the slot TAILQ, so that it won't 1267 * conflict with our new state. 1268 */ 1269 pf_set_protostate(si, PF_PEER_BOTH, 1270 TCPS_CLOSED); 1271 si->timeout = PFTM_PURGE; 1272 olds = si; 1273 } else { 1274 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1275 printf("pf: %s key attach " 1276 "failed on %s: ", 1277 (idx == PF_SK_WIRE) ? 1278 "wire" : "stack", 1279 s->kif->pfik_name); 1280 pf_print_state_parts(s, 1281 (idx == PF_SK_WIRE) ? 1282 sk : NULL, 1283 (idx == PF_SK_STACK) ? 1284 sk : NULL); 1285 printf(", existing: "); 1286 pf_print_state_parts(si, 1287 (idx == PF_SK_WIRE) ? 1288 sk : NULL, 1289 (idx == PF_SK_STACK) ? 1290 sk : NULL); 1291 printf("\n"); 1292 } 1293 PF_HASHROW_UNLOCK(ih); 1294 KEYS_UNLOCK(); 1295 uma_zfree(V_pf_state_key_z, sk); 1296 if (idx == PF_SK_STACK) 1297 pf_detach_state(s); 1298 return (EEXIST); /* collision! */ 1299 } 1300 } 1301 PF_HASHROW_UNLOCK(ih); 1302 } 1303 uma_zfree(V_pf_state_key_z, sk); 1304 s->key[idx] = cur; 1305 } else { 1306 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1307 s->key[idx] = sk; 1308 } 1309 1310 stateattach: 1311 /* List is sorted, if-bound states before floating. */ 1312 if (s->kif == V_pfi_all) 1313 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1314 else 1315 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1316 1317 if (olds) { 1318 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1319 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1320 key_list[idx]); 1321 olds = NULL; 1322 } 1323 1324 /* 1325 * Attach done. See how should we (or should not?) 1326 * attach a second key. 1327 */ 1328 if (sks == skw) { 1329 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1330 idx = PF_SK_STACK; 1331 sks = NULL; 1332 goto stateattach; 1333 } else if (sks != NULL) { 1334 /* 1335 * Continue attaching with stack key. 1336 */ 1337 sk = sks; 1338 kh = khs; 1339 idx = PF_SK_STACK; 1340 sks = NULL; 1341 goto keyattach; 1342 } 1343 1344 PF_STATE_LOCK(s); 1345 KEYS_UNLOCK(); 1346 1347 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1348 ("%s failure", __func__)); 1349 1350 return (0); 1351 #undef KEYS_UNLOCK 1352 } 1353 1354 static void 1355 pf_detach_state(struct pf_kstate *s) 1356 { 1357 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1358 struct pf_keyhash *kh; 1359 1360 if (sks != NULL) { 1361 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1362 PF_HASHROW_LOCK(kh); 1363 if (s->key[PF_SK_STACK] != NULL) 1364 pf_state_key_detach(s, PF_SK_STACK); 1365 /* 1366 * If both point to same key, then we are done. 1367 */ 1368 if (sks == s->key[PF_SK_WIRE]) { 1369 pf_state_key_detach(s, PF_SK_WIRE); 1370 PF_HASHROW_UNLOCK(kh); 1371 return; 1372 } 1373 PF_HASHROW_UNLOCK(kh); 1374 } 1375 1376 if (s->key[PF_SK_WIRE] != NULL) { 1377 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1378 PF_HASHROW_LOCK(kh); 1379 if (s->key[PF_SK_WIRE] != NULL) 1380 pf_state_key_detach(s, PF_SK_WIRE); 1381 PF_HASHROW_UNLOCK(kh); 1382 } 1383 } 1384 1385 static void 1386 pf_state_key_detach(struct pf_kstate *s, int idx) 1387 { 1388 struct pf_state_key *sk = s->key[idx]; 1389 #ifdef INVARIANTS 1390 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1391 1392 PF_HASHROW_ASSERT(kh); 1393 #endif 1394 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1395 s->key[idx] = NULL; 1396 1397 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1398 LIST_REMOVE(sk, entry); 1399 uma_zfree(V_pf_state_key_z, sk); 1400 } 1401 } 1402 1403 static int 1404 pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1405 { 1406 struct pf_state_key *sk = mem; 1407 1408 bzero(sk, sizeof(struct pf_state_key_cmp)); 1409 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1410 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1411 1412 return (0); 1413 } 1414 1415 struct pf_state_key * 1416 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1417 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1418 { 1419 struct pf_state_key *sk; 1420 1421 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1422 if (sk == NULL) 1423 return (NULL); 1424 1425 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1426 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1427 sk->port[pd->sidx] = sport; 1428 sk->port[pd->didx] = dport; 1429 sk->proto = pd->proto; 1430 sk->af = pd->af; 1431 1432 return (sk); 1433 } 1434 1435 struct pf_state_key * 1436 pf_state_key_clone(struct pf_state_key *orig) 1437 { 1438 struct pf_state_key *sk; 1439 1440 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1441 if (sk == NULL) 1442 return (NULL); 1443 1444 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1445 1446 return (sk); 1447 } 1448 1449 int 1450 pf_state_insert(struct pfi_kkif *kif, struct pfi_kkif *orig_kif, 1451 struct pf_state_key *skw, struct pf_state_key *sks, struct pf_kstate *s) 1452 { 1453 struct pf_idhash *ih; 1454 struct pf_kstate *cur; 1455 int error; 1456 1457 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1458 ("%s: sks not pristine", __func__)); 1459 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1460 ("%s: skw not pristine", __func__)); 1461 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1462 1463 s->kif = kif; 1464 s->orig_kif = orig_kif; 1465 1466 if (s->id == 0 && s->creatorid == 0) { 1467 s->id = alloc_unr64(&V_pf_stateid); 1468 s->id = htobe64(s->id); 1469 s->creatorid = V_pf_status.hostid; 1470 } 1471 1472 /* Returns with ID locked on success. */ 1473 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1474 return (error); 1475 1476 ih = &V_pf_idhash[PF_IDHASH(s)]; 1477 PF_HASHROW_ASSERT(ih); 1478 LIST_FOREACH(cur, &ih->states, entry) 1479 if (cur->id == s->id && cur->creatorid == s->creatorid) 1480 break; 1481 1482 if (cur != NULL) { 1483 PF_HASHROW_UNLOCK(ih); 1484 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1485 printf("pf: state ID collision: " 1486 "id: %016llx creatorid: %08x\n", 1487 (unsigned long long)be64toh(s->id), 1488 ntohl(s->creatorid)); 1489 } 1490 pf_detach_state(s); 1491 return (EEXIST); 1492 } 1493 LIST_INSERT_HEAD(&ih->states, s, entry); 1494 /* One for keys, one for ID hash. */ 1495 refcount_init(&s->refs, 2); 1496 1497 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1498 if (V_pfsync_insert_state_ptr != NULL) 1499 V_pfsync_insert_state_ptr(s); 1500 1501 /* Returns locked. */ 1502 return (0); 1503 } 1504 1505 /* 1506 * Find state by ID: returns with locked row on success. 1507 */ 1508 struct pf_kstate * 1509 pf_find_state_byid(uint64_t id, uint32_t creatorid) 1510 { 1511 struct pf_idhash *ih; 1512 struct pf_kstate *s; 1513 1514 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1515 1516 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; 1517 1518 PF_HASHROW_LOCK(ih); 1519 LIST_FOREACH(s, &ih->states, entry) 1520 if (s->id == id && s->creatorid == creatorid) 1521 break; 1522 1523 if (s == NULL) 1524 PF_HASHROW_UNLOCK(ih); 1525 1526 return (s); 1527 } 1528 1529 /* 1530 * Find state by key. 1531 * Returns with ID hash slot locked on success. 1532 */ 1533 static struct pf_kstate * 1534 pf_find_state(struct pfi_kkif *kif, struct pf_state_key_cmp *key, u_int dir) 1535 { 1536 struct pf_keyhash *kh; 1537 struct pf_state_key *sk; 1538 struct pf_kstate *s; 1539 int idx; 1540 1541 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1542 1543 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1544 1545 PF_HASHROW_LOCK(kh); 1546 LIST_FOREACH(sk, &kh->keys, entry) 1547 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1548 break; 1549 if (sk == NULL) { 1550 PF_HASHROW_UNLOCK(kh); 1551 return (NULL); 1552 } 1553 1554 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1555 1556 /* List is sorted, if-bound states before floating ones. */ 1557 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1558 if (s->kif == V_pfi_all || s->kif == kif) { 1559 PF_STATE_LOCK(s); 1560 PF_HASHROW_UNLOCK(kh); 1561 if (__predict_false(s->timeout >= PFTM_MAX)) { 1562 /* 1563 * State is either being processed by 1564 * pf_unlink_state() in an other thread, or 1565 * is scheduled for immediate expiry. 1566 */ 1567 PF_STATE_UNLOCK(s); 1568 return (NULL); 1569 } 1570 return (s); 1571 } 1572 PF_HASHROW_UNLOCK(kh); 1573 1574 return (NULL); 1575 } 1576 1577 /* 1578 * Returns with ID hash slot locked on success. 1579 */ 1580 struct pf_kstate * 1581 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1582 { 1583 struct pf_keyhash *kh; 1584 struct pf_state_key *sk; 1585 struct pf_kstate *s, *ret = NULL; 1586 int idx, inout = 0; 1587 1588 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1589 1590 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1591 1592 PF_HASHROW_LOCK(kh); 1593 LIST_FOREACH(sk, &kh->keys, entry) 1594 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1595 break; 1596 if (sk == NULL) { 1597 PF_HASHROW_UNLOCK(kh); 1598 return (NULL); 1599 } 1600 switch (dir) { 1601 case PF_IN: 1602 idx = PF_SK_WIRE; 1603 break; 1604 case PF_OUT: 1605 idx = PF_SK_STACK; 1606 break; 1607 case PF_INOUT: 1608 idx = PF_SK_WIRE; 1609 inout = 1; 1610 break; 1611 default: 1612 panic("%s: dir %u", __func__, dir); 1613 } 1614 second_run: 1615 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1616 if (more == NULL) { 1617 PF_STATE_LOCK(s); 1618 PF_HASHROW_UNLOCK(kh); 1619 return (s); 1620 } 1621 1622 if (ret) 1623 (*more)++; 1624 else { 1625 ret = s; 1626 PF_STATE_LOCK(s); 1627 } 1628 } 1629 if (inout == 1) { 1630 inout = 0; 1631 idx = PF_SK_STACK; 1632 goto second_run; 1633 } 1634 PF_HASHROW_UNLOCK(kh); 1635 1636 return (ret); 1637 } 1638 1639 /* 1640 * FIXME 1641 * This routine is inefficient -- locks the state only to unlock immediately on 1642 * return. 1643 * It is racy -- after the state is unlocked nothing stops other threads from 1644 * removing it. 1645 */ 1646 bool 1647 pf_find_state_all_exists(struct pf_state_key_cmp *key, u_int dir) 1648 { 1649 struct pf_kstate *s; 1650 1651 s = pf_find_state_all(key, dir, NULL); 1652 if (s != NULL) { 1653 PF_STATE_UNLOCK(s); 1654 return (true); 1655 } 1656 return (false); 1657 } 1658 1659 /* END state table stuff */ 1660 1661 static void 1662 pf_send(struct pf_send_entry *pfse) 1663 { 1664 1665 PF_SENDQ_LOCK(); 1666 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1667 PF_SENDQ_UNLOCK(); 1668 swi_sched(V_pf_swi_cookie, 0); 1669 } 1670 1671 static bool 1672 pf_isforlocal(struct mbuf *m, int af) 1673 { 1674 switch (af) { 1675 #ifdef INET 1676 case AF_INET: { 1677 struct ip *ip = mtod(m, struct ip *); 1678 1679 return (in_localip(ip->ip_dst)); 1680 } 1681 #endif 1682 #ifdef INET6 1683 case AF_INET6: { 1684 struct ip6_hdr *ip6; 1685 struct in6_ifaddr *ia; 1686 ip6 = mtod(m, struct ip6_hdr *); 1687 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 1688 if (ia == NULL) 1689 return (false); 1690 return (! (ia->ia6_flags & IN6_IFF_NOTREADY)); 1691 } 1692 #endif 1693 default: 1694 panic("Unsupported af %d", af); 1695 } 1696 1697 return (false); 1698 } 1699 1700 void 1701 pf_intr(void *v) 1702 { 1703 struct epoch_tracker et; 1704 struct pf_send_head queue; 1705 struct pf_send_entry *pfse, *next; 1706 1707 CURVNET_SET((struct vnet *)v); 1708 1709 PF_SENDQ_LOCK(); 1710 queue = V_pf_sendqueue; 1711 STAILQ_INIT(&V_pf_sendqueue); 1712 PF_SENDQ_UNLOCK(); 1713 1714 NET_EPOCH_ENTER(et); 1715 1716 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1717 switch (pfse->pfse_type) { 1718 #ifdef INET 1719 case PFSE_IP: { 1720 if (pf_isforlocal(pfse->pfse_m, AF_INET)) { 1721 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; 1722 pfse->pfse_m->m_pkthdr.csum_flags |= 1723 CSUM_IP_VALID | CSUM_IP_CHECKED; 1724 ip_input(pfse->pfse_m); 1725 } else { 1726 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, 1727 NULL); 1728 } 1729 break; 1730 } 1731 case PFSE_ICMP: 1732 icmp_error(pfse->pfse_m, pfse->icmpopts.type, 1733 pfse->icmpopts.code, 0, pfse->icmpopts.mtu); 1734 break; 1735 #endif /* INET */ 1736 #ifdef INET6 1737 case PFSE_IP6: 1738 if (pf_isforlocal(pfse->pfse_m, AF_INET6)) { 1739 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; 1740 ip6_input(pfse->pfse_m); 1741 } else { 1742 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, 1743 NULL, NULL); 1744 } 1745 break; 1746 case PFSE_ICMP6: 1747 icmp6_error(pfse->pfse_m, pfse->icmpopts.type, 1748 pfse->icmpopts.code, pfse->icmpopts.mtu); 1749 break; 1750 #endif /* INET6 */ 1751 default: 1752 panic("%s: unknown type", __func__); 1753 } 1754 free(pfse, M_PFTEMP); 1755 } 1756 NET_EPOCH_EXIT(et); 1757 CURVNET_RESTORE(); 1758 } 1759 1760 #define pf_purge_thread_period (hz / 10) 1761 1762 #ifdef PF_WANT_32_TO_64_COUNTER 1763 static void 1764 pf_status_counter_u64_periodic(void) 1765 { 1766 1767 PF_RULES_RASSERT(); 1768 1769 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 60)) != 0) { 1770 return; 1771 } 1772 1773 for (int i = 0; i < FCNT_MAX; i++) { 1774 pf_counter_u64_periodic(&V_pf_status.fcounters[i]); 1775 } 1776 } 1777 1778 static void 1779 pf_kif_counter_u64_periodic(void) 1780 { 1781 struct pfi_kkif *kif; 1782 size_t r, run; 1783 1784 PF_RULES_RASSERT(); 1785 1786 if (__predict_false(V_pf_allkifcount == 0)) { 1787 return; 1788 } 1789 1790 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { 1791 return; 1792 } 1793 1794 run = V_pf_allkifcount / 10; 1795 if (run < 5) 1796 run = 5; 1797 1798 for (r = 0; r < run; r++) { 1799 kif = LIST_NEXT(V_pf_kifmarker, pfik_allkiflist); 1800 if (kif == NULL) { 1801 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); 1802 LIST_INSERT_HEAD(&V_pf_allkiflist, V_pf_kifmarker, pfik_allkiflist); 1803 break; 1804 } 1805 1806 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); 1807 LIST_INSERT_AFTER(kif, V_pf_kifmarker, pfik_allkiflist); 1808 1809 for (int i = 0; i < 2; i++) { 1810 for (int j = 0; j < 2; j++) { 1811 for (int k = 0; k < 2; k++) { 1812 pf_counter_u64_periodic(&kif->pfik_packets[i][j][k]); 1813 pf_counter_u64_periodic(&kif->pfik_bytes[i][j][k]); 1814 } 1815 } 1816 } 1817 } 1818 } 1819 1820 static void 1821 pf_rule_counter_u64_periodic(void) 1822 { 1823 struct pf_krule *rule; 1824 size_t r, run; 1825 1826 PF_RULES_RASSERT(); 1827 1828 if (__predict_false(V_pf_allrulecount == 0)) { 1829 return; 1830 } 1831 1832 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { 1833 return; 1834 } 1835 1836 run = V_pf_allrulecount / 10; 1837 if (run < 5) 1838 run = 5; 1839 1840 for (r = 0; r < run; r++) { 1841 rule = LIST_NEXT(V_pf_rulemarker, allrulelist); 1842 if (rule == NULL) { 1843 LIST_REMOVE(V_pf_rulemarker, allrulelist); 1844 LIST_INSERT_HEAD(&V_pf_allrulelist, V_pf_rulemarker, allrulelist); 1845 break; 1846 } 1847 1848 LIST_REMOVE(V_pf_rulemarker, allrulelist); 1849 LIST_INSERT_AFTER(rule, V_pf_rulemarker, allrulelist); 1850 1851 pf_counter_u64_periodic(&rule->evaluations); 1852 for (int i = 0; i < 2; i++) { 1853 pf_counter_u64_periodic(&rule->packets[i]); 1854 pf_counter_u64_periodic(&rule->bytes[i]); 1855 } 1856 } 1857 } 1858 1859 static void 1860 pf_counter_u64_periodic_main(void) 1861 { 1862 PF_RULES_RLOCK_TRACKER; 1863 1864 V_pf_counter_periodic_iter++; 1865 1866 PF_RULES_RLOCK(); 1867 pf_counter_u64_critical_enter(); 1868 pf_status_counter_u64_periodic(); 1869 pf_kif_counter_u64_periodic(); 1870 pf_rule_counter_u64_periodic(); 1871 pf_counter_u64_critical_exit(); 1872 PF_RULES_RUNLOCK(); 1873 } 1874 #else 1875 #define pf_counter_u64_periodic_main() do { } while (0) 1876 #endif 1877 1878 void 1879 pf_purge_thread(void *unused __unused) 1880 { 1881 VNET_ITERATOR_DECL(vnet_iter); 1882 1883 sx_xlock(&pf_end_lock); 1884 while (pf_end_threads == 0) { 1885 sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", pf_purge_thread_period); 1886 1887 VNET_LIST_RLOCK(); 1888 VNET_FOREACH(vnet_iter) { 1889 CURVNET_SET(vnet_iter); 1890 1891 /* Wait until V_pf_default_rule is initialized. */ 1892 if (V_pf_vnet_active == 0) { 1893 CURVNET_RESTORE(); 1894 continue; 1895 } 1896 1897 pf_counter_u64_periodic_main(); 1898 1899 /* 1900 * Process 1/interval fraction of the state 1901 * table every run. 1902 */ 1903 V_pf_purge_idx = 1904 pf_purge_expired_states(V_pf_purge_idx, pf_hashmask / 1905 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1906 1907 /* 1908 * Purge other expired types every 1909 * PFTM_INTERVAL seconds. 1910 */ 1911 if (V_pf_purge_idx == 0) { 1912 /* 1913 * Order is important: 1914 * - states and src nodes reference rules 1915 * - states and rules reference kifs 1916 */ 1917 pf_purge_expired_fragments(); 1918 pf_purge_expired_src_nodes(); 1919 pf_purge_unlinked_rules(); 1920 pfi_kkif_purge(); 1921 } 1922 CURVNET_RESTORE(); 1923 } 1924 VNET_LIST_RUNLOCK(); 1925 } 1926 1927 pf_end_threads++; 1928 sx_xunlock(&pf_end_lock); 1929 kproc_exit(0); 1930 } 1931 1932 void 1933 pf_unload_vnet_purge(void) 1934 { 1935 1936 /* 1937 * To cleanse up all kifs and rules we need 1938 * two runs: first one clears reference flags, 1939 * then pf_purge_expired_states() doesn't 1940 * raise them, and then second run frees. 1941 */ 1942 pf_purge_unlinked_rules(); 1943 pfi_kkif_purge(); 1944 1945 /* 1946 * Now purge everything. 1947 */ 1948 pf_purge_expired_states(0, pf_hashmask); 1949 pf_purge_fragments(UINT_MAX); 1950 pf_purge_expired_src_nodes(); 1951 1952 /* 1953 * Now all kifs & rules should be unreferenced, 1954 * thus should be successfully freed. 1955 */ 1956 pf_purge_unlinked_rules(); 1957 pfi_kkif_purge(); 1958 } 1959 1960 u_int32_t 1961 pf_state_expires(const struct pf_kstate *state) 1962 { 1963 u_int32_t timeout; 1964 u_int32_t start; 1965 u_int32_t end; 1966 u_int32_t states; 1967 1968 /* handle all PFTM_* > PFTM_MAX here */ 1969 if (state->timeout == PFTM_PURGE) 1970 return (time_uptime); 1971 KASSERT(state->timeout != PFTM_UNLINKED, 1972 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1973 KASSERT((state->timeout < PFTM_MAX), 1974 ("pf_state_expires: timeout > PFTM_MAX")); 1975 timeout = state->rule.ptr->timeout[state->timeout]; 1976 if (!timeout) 1977 timeout = V_pf_default_rule.timeout[state->timeout]; 1978 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1979 if (start && state->rule.ptr != &V_pf_default_rule) { 1980 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1981 states = counter_u64_fetch(state->rule.ptr->states_cur); 1982 } else { 1983 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1984 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1985 states = V_pf_status.states; 1986 } 1987 if (end && states > start && start < end) { 1988 if (states < end) { 1989 timeout = (u_int64_t)timeout * (end - states) / 1990 (end - start); 1991 return (state->expire + timeout); 1992 } 1993 else 1994 return (time_uptime); 1995 } 1996 return (state->expire + timeout); 1997 } 1998 1999 void 2000 pf_purge_expired_src_nodes(void) 2001 { 2002 struct pf_ksrc_node_list freelist; 2003 struct pf_srchash *sh; 2004 struct pf_ksrc_node *cur, *next; 2005 int i; 2006 2007 LIST_INIT(&freelist); 2008 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 2009 PF_HASHROW_LOCK(sh); 2010 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 2011 if (cur->states == 0 && cur->expire <= time_uptime) { 2012 pf_unlink_src_node(cur); 2013 LIST_INSERT_HEAD(&freelist, cur, entry); 2014 } else if (cur->rule.ptr != NULL) 2015 cur->rule.ptr->rule_ref |= PFRULE_REFS; 2016 PF_HASHROW_UNLOCK(sh); 2017 } 2018 2019 pf_free_src_nodes(&freelist); 2020 2021 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 2022 } 2023 2024 static void 2025 pf_src_tree_remove_state(struct pf_kstate *s) 2026 { 2027 struct pf_ksrc_node *sn; 2028 uint32_t timeout; 2029 2030 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ? 2031 s->rule.ptr->timeout[PFTM_SRC_NODE] : 2032 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 2033 2034 if (s->src_node != NULL) { 2035 sn = s->src_node; 2036 PF_SRC_NODE_LOCK(sn); 2037 if (s->src.tcp_est) 2038 --sn->conn; 2039 if (--sn->states == 0) 2040 sn->expire = time_uptime + timeout; 2041 PF_SRC_NODE_UNLOCK(sn); 2042 } 2043 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 2044 sn = s->nat_src_node; 2045 PF_SRC_NODE_LOCK(sn); 2046 if (--sn->states == 0) 2047 sn->expire = time_uptime + timeout; 2048 PF_SRC_NODE_UNLOCK(sn); 2049 } 2050 s->src_node = s->nat_src_node = NULL; 2051 } 2052 2053 /* 2054 * Unlink and potentilly free a state. Function may be 2055 * called with ID hash row locked, but always returns 2056 * unlocked, since it needs to go through key hash locking. 2057 */ 2058 int 2059 pf_unlink_state(struct pf_kstate *s) 2060 { 2061 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 2062 2063 PF_HASHROW_ASSERT(ih); 2064 2065 if (s->timeout == PFTM_UNLINKED) { 2066 /* 2067 * State is being processed 2068 * by pf_unlink_state() in 2069 * an other thread. 2070 */ 2071 PF_HASHROW_UNLOCK(ih); 2072 return (0); /* XXXGL: undefined actually */ 2073 } 2074 2075 if (s->src.state == PF_TCPS_PROXY_DST) { 2076 /* XXX wire key the right one? */ 2077 pf_send_tcp(s->rule.ptr, s->key[PF_SK_WIRE]->af, 2078 &s->key[PF_SK_WIRE]->addr[1], 2079 &s->key[PF_SK_WIRE]->addr[0], 2080 s->key[PF_SK_WIRE]->port[1], 2081 s->key[PF_SK_WIRE]->port[0], 2082 s->src.seqhi, s->src.seqlo + 1, 2083 TH_RST|TH_ACK, 0, 0, 0, true, s->tag, 0, s->act.rtableid); 2084 } 2085 2086 LIST_REMOVE(s, entry); 2087 pf_src_tree_remove_state(s); 2088 2089 if (V_pfsync_delete_state_ptr != NULL) 2090 V_pfsync_delete_state_ptr(s); 2091 2092 STATE_DEC_COUNTERS(s); 2093 2094 s->timeout = PFTM_UNLINKED; 2095 2096 /* Ensure we remove it from the list of halfopen states, if needed. */ 2097 if (s->key[PF_SK_STACK] != NULL && 2098 s->key[PF_SK_STACK]->proto == IPPROTO_TCP) 2099 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED); 2100 2101 PF_HASHROW_UNLOCK(ih); 2102 2103 pf_detach_state(s); 2104 /* pf_state_insert() initialises refs to 2 */ 2105 return (pf_release_staten(s, 2)); 2106 } 2107 2108 struct pf_kstate * 2109 pf_alloc_state(int flags) 2110 { 2111 2112 return (uma_zalloc(V_pf_state_z, flags | M_ZERO)); 2113 } 2114 2115 void 2116 pf_free_state(struct pf_kstate *cur) 2117 { 2118 struct pf_krule_item *ri; 2119 2120 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 2121 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 2122 cur->timeout)); 2123 2124 while ((ri = SLIST_FIRST(&cur->match_rules))) { 2125 SLIST_REMOVE_HEAD(&cur->match_rules, entry); 2126 free(ri, M_PF_RULE_ITEM); 2127 } 2128 2129 pf_normalize_tcp_cleanup(cur); 2130 uma_zfree(V_pf_state_z, cur); 2131 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 2132 } 2133 2134 /* 2135 * Called only from pf_purge_thread(), thus serialized. 2136 */ 2137 static u_int 2138 pf_purge_expired_states(u_int i, int maxcheck) 2139 { 2140 struct pf_idhash *ih; 2141 struct pf_kstate *s; 2142 struct pf_krule_item *mrm; 2143 2144 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2145 2146 /* 2147 * Go through hash and unlink states that expire now. 2148 */ 2149 while (maxcheck > 0) { 2150 ih = &V_pf_idhash[i]; 2151 2152 /* only take the lock if we expect to do work */ 2153 if (!LIST_EMPTY(&ih->states)) { 2154 relock: 2155 PF_HASHROW_LOCK(ih); 2156 LIST_FOREACH(s, &ih->states, entry) { 2157 if (pf_state_expires(s) <= time_uptime) { 2158 V_pf_status.states -= 2159 pf_unlink_state(s); 2160 goto relock; 2161 } 2162 s->rule.ptr->rule_ref |= PFRULE_REFS; 2163 if (s->nat_rule.ptr != NULL) 2164 s->nat_rule.ptr->rule_ref |= PFRULE_REFS; 2165 if (s->anchor.ptr != NULL) 2166 s->anchor.ptr->rule_ref |= PFRULE_REFS; 2167 s->kif->pfik_flags |= PFI_IFLAG_REFS; 2168 SLIST_FOREACH(mrm, &s->match_rules, entry) 2169 mrm->r->rule_ref |= PFRULE_REFS; 2170 if (s->rt_kif) 2171 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 2172 } 2173 PF_HASHROW_UNLOCK(ih); 2174 } 2175 2176 /* Return when we hit end of hash. */ 2177 if (++i > pf_hashmask) { 2178 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2179 return (0); 2180 } 2181 2182 maxcheck--; 2183 } 2184 2185 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2186 2187 return (i); 2188 } 2189 2190 static void 2191 pf_purge_unlinked_rules(void) 2192 { 2193 struct pf_krulequeue tmpq; 2194 struct pf_krule *r, *r1; 2195 2196 /* 2197 * If we have overloading task pending, then we'd 2198 * better skip purging this time. There is a tiny 2199 * probability that overloading task references 2200 * an already unlinked rule. 2201 */ 2202 PF_OVERLOADQ_LOCK(); 2203 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 2204 PF_OVERLOADQ_UNLOCK(); 2205 return; 2206 } 2207 PF_OVERLOADQ_UNLOCK(); 2208 2209 /* 2210 * Do naive mark-and-sweep garbage collecting of old rules. 2211 * Reference flag is raised by pf_purge_expired_states() 2212 * and pf_purge_expired_src_nodes(). 2213 * 2214 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 2215 * use a temporary queue. 2216 */ 2217 TAILQ_INIT(&tmpq); 2218 PF_UNLNKDRULES_LOCK(); 2219 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 2220 if (!(r->rule_ref & PFRULE_REFS)) { 2221 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 2222 TAILQ_INSERT_TAIL(&tmpq, r, entries); 2223 } else 2224 r->rule_ref &= ~PFRULE_REFS; 2225 } 2226 PF_UNLNKDRULES_UNLOCK(); 2227 2228 if (!TAILQ_EMPTY(&tmpq)) { 2229 PF_CONFIG_LOCK(); 2230 PF_RULES_WLOCK(); 2231 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 2232 TAILQ_REMOVE(&tmpq, r, entries); 2233 pf_free_rule(r); 2234 } 2235 PF_RULES_WUNLOCK(); 2236 PF_CONFIG_UNLOCK(); 2237 } 2238 } 2239 2240 void 2241 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 2242 { 2243 switch (af) { 2244 #ifdef INET 2245 case AF_INET: { 2246 u_int32_t a = ntohl(addr->addr32[0]); 2247 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 2248 (a>>8)&255, a&255); 2249 if (p) { 2250 p = ntohs(p); 2251 printf(":%u", p); 2252 } 2253 break; 2254 } 2255 #endif /* INET */ 2256 #ifdef INET6 2257 case AF_INET6: { 2258 u_int16_t b; 2259 u_int8_t i, curstart, curend, maxstart, maxend; 2260 curstart = curend = maxstart = maxend = 255; 2261 for (i = 0; i < 8; i++) { 2262 if (!addr->addr16[i]) { 2263 if (curstart == 255) 2264 curstart = i; 2265 curend = i; 2266 } else { 2267 if ((curend - curstart) > 2268 (maxend - maxstart)) { 2269 maxstart = curstart; 2270 maxend = curend; 2271 } 2272 curstart = curend = 255; 2273 } 2274 } 2275 if ((curend - curstart) > 2276 (maxend - maxstart)) { 2277 maxstart = curstart; 2278 maxend = curend; 2279 } 2280 for (i = 0; i < 8; i++) { 2281 if (i >= maxstart && i <= maxend) { 2282 if (i == 0) 2283 printf(":"); 2284 if (i == maxend) 2285 printf(":"); 2286 } else { 2287 b = ntohs(addr->addr16[i]); 2288 printf("%x", b); 2289 if (i < 7) 2290 printf(":"); 2291 } 2292 } 2293 if (p) { 2294 p = ntohs(p); 2295 printf("[%u]", p); 2296 } 2297 break; 2298 } 2299 #endif /* INET6 */ 2300 } 2301 } 2302 2303 void 2304 pf_print_state(struct pf_kstate *s) 2305 { 2306 pf_print_state_parts(s, NULL, NULL); 2307 } 2308 2309 static void 2310 pf_print_state_parts(struct pf_kstate *s, 2311 struct pf_state_key *skwp, struct pf_state_key *sksp) 2312 { 2313 struct pf_state_key *skw, *sks; 2314 u_int8_t proto, dir; 2315 2316 /* Do our best to fill these, but they're skipped if NULL */ 2317 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 2318 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 2319 proto = skw ? skw->proto : (sks ? sks->proto : 0); 2320 dir = s ? s->direction : 0; 2321 2322 switch (proto) { 2323 case IPPROTO_IPV4: 2324 printf("IPv4"); 2325 break; 2326 case IPPROTO_IPV6: 2327 printf("IPv6"); 2328 break; 2329 case IPPROTO_TCP: 2330 printf("TCP"); 2331 break; 2332 case IPPROTO_UDP: 2333 printf("UDP"); 2334 break; 2335 case IPPROTO_ICMP: 2336 printf("ICMP"); 2337 break; 2338 case IPPROTO_ICMPV6: 2339 printf("ICMPv6"); 2340 break; 2341 default: 2342 printf("%u", proto); 2343 break; 2344 } 2345 switch (dir) { 2346 case PF_IN: 2347 printf(" in"); 2348 break; 2349 case PF_OUT: 2350 printf(" out"); 2351 break; 2352 } 2353 if (skw) { 2354 printf(" wire: "); 2355 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 2356 printf(" "); 2357 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 2358 } 2359 if (sks) { 2360 printf(" stack: "); 2361 if (sks != skw) { 2362 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 2363 printf(" "); 2364 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 2365 } else 2366 printf("-"); 2367 } 2368 if (s) { 2369 if (proto == IPPROTO_TCP) { 2370 printf(" [lo=%u high=%u win=%u modulator=%u", 2371 s->src.seqlo, s->src.seqhi, 2372 s->src.max_win, s->src.seqdiff); 2373 if (s->src.wscale && s->dst.wscale) 2374 printf(" wscale=%u", 2375 s->src.wscale & PF_WSCALE_MASK); 2376 printf("]"); 2377 printf(" [lo=%u high=%u win=%u modulator=%u", 2378 s->dst.seqlo, s->dst.seqhi, 2379 s->dst.max_win, s->dst.seqdiff); 2380 if (s->src.wscale && s->dst.wscale) 2381 printf(" wscale=%u", 2382 s->dst.wscale & PF_WSCALE_MASK); 2383 printf("]"); 2384 } 2385 printf(" %u:%u", s->src.state, s->dst.state); 2386 } 2387 } 2388 2389 void 2390 pf_print_flags(u_int8_t f) 2391 { 2392 if (f) 2393 printf(" "); 2394 if (f & TH_FIN) 2395 printf("F"); 2396 if (f & TH_SYN) 2397 printf("S"); 2398 if (f & TH_RST) 2399 printf("R"); 2400 if (f & TH_PUSH) 2401 printf("P"); 2402 if (f & TH_ACK) 2403 printf("A"); 2404 if (f & TH_URG) 2405 printf("U"); 2406 if (f & TH_ECE) 2407 printf("E"); 2408 if (f & TH_CWR) 2409 printf("W"); 2410 } 2411 2412 #define PF_SET_SKIP_STEPS(i) \ 2413 do { \ 2414 while (head[i] != cur) { \ 2415 head[i]->skip[i].ptr = cur; \ 2416 head[i] = TAILQ_NEXT(head[i], entries); \ 2417 } \ 2418 } while (0) 2419 2420 void 2421 pf_calc_skip_steps(struct pf_krulequeue *rules) 2422 { 2423 struct pf_krule *cur, *prev, *head[PF_SKIP_COUNT]; 2424 int i; 2425 2426 cur = TAILQ_FIRST(rules); 2427 prev = cur; 2428 for (i = 0; i < PF_SKIP_COUNT; ++i) 2429 head[i] = cur; 2430 while (cur != NULL) { 2431 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 2432 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 2433 if (cur->direction != prev->direction) 2434 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 2435 if (cur->af != prev->af) 2436 PF_SET_SKIP_STEPS(PF_SKIP_AF); 2437 if (cur->proto != prev->proto) 2438 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 2439 if (cur->src.neg != prev->src.neg || 2440 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 2441 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 2442 if (cur->src.port[0] != prev->src.port[0] || 2443 cur->src.port[1] != prev->src.port[1] || 2444 cur->src.port_op != prev->src.port_op) 2445 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 2446 if (cur->dst.neg != prev->dst.neg || 2447 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 2448 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 2449 if (cur->dst.port[0] != prev->dst.port[0] || 2450 cur->dst.port[1] != prev->dst.port[1] || 2451 cur->dst.port_op != prev->dst.port_op) 2452 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 2453 2454 prev = cur; 2455 cur = TAILQ_NEXT(cur, entries); 2456 } 2457 for (i = 0; i < PF_SKIP_COUNT; ++i) 2458 PF_SET_SKIP_STEPS(i); 2459 } 2460 2461 int 2462 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 2463 { 2464 if (aw1->type != aw2->type) 2465 return (1); 2466 switch (aw1->type) { 2467 case PF_ADDR_ADDRMASK: 2468 case PF_ADDR_RANGE: 2469 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6)) 2470 return (1); 2471 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6)) 2472 return (1); 2473 return (0); 2474 case PF_ADDR_DYNIFTL: 2475 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 2476 case PF_ADDR_NOROUTE: 2477 case PF_ADDR_URPFFAILED: 2478 return (0); 2479 case PF_ADDR_TABLE: 2480 return (aw1->p.tbl != aw2->p.tbl); 2481 default: 2482 printf("invalid address type: %d\n", aw1->type); 2483 return (1); 2484 } 2485 } 2486 2487 /** 2488 * Checksum updates are a little complicated because the checksum in the TCP/UDP 2489 * header isn't always a full checksum. In some cases (i.e. output) it's a 2490 * pseudo-header checksum, which is a partial checksum over src/dst IP 2491 * addresses, protocol number and length. 2492 * 2493 * That means we have the following cases: 2494 * * Input or forwarding: we don't have TSO, the checksum fields are full 2495 * checksums, we need to update the checksum whenever we change anything. 2496 * * Output (i.e. the checksum is a pseudo-header checksum): 2497 * x The field being updated is src/dst address or affects the length of 2498 * the packet. We need to update the pseudo-header checksum (note that this 2499 * checksum is not ones' complement). 2500 * x Some other field is being modified (e.g. src/dst port numbers): We 2501 * don't have to update anything. 2502 **/ 2503 u_int16_t 2504 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2505 { 2506 u_int32_t x; 2507 2508 x = cksum + old - new; 2509 x = (x + (x >> 16)) & 0xffff; 2510 2511 /* optimise: eliminate a branch when not udp */ 2512 if (udp && cksum == 0x0000) 2513 return cksum; 2514 if (udp && x == 0x0000) 2515 x = 0xffff; 2516 2517 return (u_int16_t)(x); 2518 } 2519 2520 static void 2521 pf_patch_8(struct mbuf *m, u_int16_t *cksum, u_int8_t *f, u_int8_t v, bool hi, 2522 u_int8_t udp) 2523 { 2524 u_int16_t old = htons(hi ? (*f << 8) : *f); 2525 u_int16_t new = htons(hi ? ( v << 8) : v); 2526 2527 if (*f == v) 2528 return; 2529 2530 *f = v; 2531 2532 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2533 return; 2534 2535 *cksum = pf_cksum_fixup(*cksum, old, new, udp); 2536 } 2537 2538 void 2539 pf_patch_16_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int16_t v, 2540 bool hi, u_int8_t udp) 2541 { 2542 u_int8_t *fb = (u_int8_t *)f; 2543 u_int8_t *vb = (u_int8_t *)&v; 2544 2545 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2546 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2547 } 2548 2549 void 2550 pf_patch_32_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int32_t v, 2551 bool hi, u_int8_t udp) 2552 { 2553 u_int8_t *fb = (u_int8_t *)f; 2554 u_int8_t *vb = (u_int8_t *)&v; 2555 2556 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2557 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2558 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2559 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2560 } 2561 2562 u_int16_t 2563 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old, 2564 u_int16_t new, u_int8_t udp) 2565 { 2566 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2567 return (cksum); 2568 2569 return (pf_cksum_fixup(cksum, old, new, udp)); 2570 } 2571 2572 static void 2573 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic, 2574 u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, 2575 sa_family_t af) 2576 { 2577 struct pf_addr ao; 2578 u_int16_t po = *p; 2579 2580 PF_ACPY(&ao, a, af); 2581 PF_ACPY(a, an, af); 2582 2583 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2584 *pc = ~*pc; 2585 2586 *p = pn; 2587 2588 switch (af) { 2589 #ifdef INET 2590 case AF_INET: 2591 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2592 ao.addr16[0], an->addr16[0], 0), 2593 ao.addr16[1], an->addr16[1], 0); 2594 *p = pn; 2595 2596 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc, 2597 ao.addr16[0], an->addr16[0], u), 2598 ao.addr16[1], an->addr16[1], u); 2599 2600 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2601 break; 2602 #endif /* INET */ 2603 #ifdef INET6 2604 case AF_INET6: 2605 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2606 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2607 pf_cksum_fixup(pf_cksum_fixup(*pc, 2608 ao.addr16[0], an->addr16[0], u), 2609 ao.addr16[1], an->addr16[1], u), 2610 ao.addr16[2], an->addr16[2], u), 2611 ao.addr16[3], an->addr16[3], u), 2612 ao.addr16[4], an->addr16[4], u), 2613 ao.addr16[5], an->addr16[5], u), 2614 ao.addr16[6], an->addr16[6], u), 2615 ao.addr16[7], an->addr16[7], u); 2616 2617 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2618 break; 2619 #endif /* INET6 */ 2620 } 2621 2622 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | 2623 CSUM_DELAY_DATA_IPV6)) { 2624 *pc = ~*pc; 2625 if (! *pc) 2626 *pc = 0xffff; 2627 } 2628 } 2629 2630 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2631 void 2632 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2633 { 2634 u_int32_t ao; 2635 2636 memcpy(&ao, a, sizeof(ao)); 2637 memcpy(a, &an, sizeof(u_int32_t)); 2638 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2639 ao % 65536, an % 65536, u); 2640 } 2641 2642 void 2643 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp) 2644 { 2645 u_int32_t ao; 2646 2647 memcpy(&ao, a, sizeof(ao)); 2648 memcpy(a, &an, sizeof(u_int32_t)); 2649 2650 *c = pf_proto_cksum_fixup(m, 2651 pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp), 2652 ao % 65536, an % 65536, udp); 2653 } 2654 2655 #ifdef INET6 2656 static void 2657 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2658 { 2659 struct pf_addr ao; 2660 2661 PF_ACPY(&ao, a, AF_INET6); 2662 PF_ACPY(a, an, AF_INET6); 2663 2664 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2665 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2666 pf_cksum_fixup(pf_cksum_fixup(*c, 2667 ao.addr16[0], an->addr16[0], u), 2668 ao.addr16[1], an->addr16[1], u), 2669 ao.addr16[2], an->addr16[2], u), 2670 ao.addr16[3], an->addr16[3], u), 2671 ao.addr16[4], an->addr16[4], u), 2672 ao.addr16[5], an->addr16[5], u), 2673 ao.addr16[6], an->addr16[6], u), 2674 ao.addr16[7], an->addr16[7], u); 2675 } 2676 #endif /* INET6 */ 2677 2678 static void 2679 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2680 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2681 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2682 { 2683 struct pf_addr oia, ooa; 2684 2685 PF_ACPY(&oia, ia, af); 2686 if (oa) 2687 PF_ACPY(&ooa, oa, af); 2688 2689 /* Change inner protocol port, fix inner protocol checksum. */ 2690 if (ip != NULL) { 2691 u_int16_t oip = *ip; 2692 u_int32_t opc; 2693 2694 if (pc != NULL) 2695 opc = *pc; 2696 *ip = np; 2697 if (pc != NULL) 2698 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2699 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2700 if (pc != NULL) 2701 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2702 } 2703 /* Change inner ip address, fix inner ip and icmp checksums. */ 2704 PF_ACPY(ia, na, af); 2705 switch (af) { 2706 #ifdef INET 2707 case AF_INET: { 2708 u_int32_t oh2c = *h2c; 2709 2710 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2711 oia.addr16[0], ia->addr16[0], 0), 2712 oia.addr16[1], ia->addr16[1], 0); 2713 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2714 oia.addr16[0], ia->addr16[0], 0), 2715 oia.addr16[1], ia->addr16[1], 0); 2716 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2717 break; 2718 } 2719 #endif /* INET */ 2720 #ifdef INET6 2721 case AF_INET6: 2722 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2723 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2724 pf_cksum_fixup(pf_cksum_fixup(*ic, 2725 oia.addr16[0], ia->addr16[0], u), 2726 oia.addr16[1], ia->addr16[1], u), 2727 oia.addr16[2], ia->addr16[2], u), 2728 oia.addr16[3], ia->addr16[3], u), 2729 oia.addr16[4], ia->addr16[4], u), 2730 oia.addr16[5], ia->addr16[5], u), 2731 oia.addr16[6], ia->addr16[6], u), 2732 oia.addr16[7], ia->addr16[7], u); 2733 break; 2734 #endif /* INET6 */ 2735 } 2736 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2737 if (oa) { 2738 PF_ACPY(oa, na, af); 2739 switch (af) { 2740 #ifdef INET 2741 case AF_INET: 2742 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2743 ooa.addr16[0], oa->addr16[0], 0), 2744 ooa.addr16[1], oa->addr16[1], 0); 2745 break; 2746 #endif /* INET */ 2747 #ifdef INET6 2748 case AF_INET6: 2749 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2750 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2751 pf_cksum_fixup(pf_cksum_fixup(*ic, 2752 ooa.addr16[0], oa->addr16[0], u), 2753 ooa.addr16[1], oa->addr16[1], u), 2754 ooa.addr16[2], oa->addr16[2], u), 2755 ooa.addr16[3], oa->addr16[3], u), 2756 ooa.addr16[4], oa->addr16[4], u), 2757 ooa.addr16[5], oa->addr16[5], u), 2758 ooa.addr16[6], oa->addr16[6], u), 2759 ooa.addr16[7], oa->addr16[7], u); 2760 break; 2761 #endif /* INET6 */ 2762 } 2763 } 2764 } 2765 2766 /* 2767 * Need to modulate the sequence numbers in the TCP SACK option 2768 * (credits to Krzysztof Pfaff for report and patch) 2769 */ 2770 static int 2771 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2772 struct tcphdr *th, struct pf_state_peer *dst) 2773 { 2774 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2775 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2776 int copyback = 0, i, olen; 2777 struct sackblk sack; 2778 2779 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2780 if (hlen < TCPOLEN_SACKLEN || 2781 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2782 return 0; 2783 2784 while (hlen >= TCPOLEN_SACKLEN) { 2785 size_t startoff = opt - opts; 2786 olen = opt[1]; 2787 switch (*opt) { 2788 case TCPOPT_EOL: /* FALLTHROUGH */ 2789 case TCPOPT_NOP: 2790 opt++; 2791 hlen--; 2792 break; 2793 case TCPOPT_SACK: 2794 if (olen > hlen) 2795 olen = hlen; 2796 if (olen >= TCPOLEN_SACKLEN) { 2797 for (i = 2; i + TCPOLEN_SACK <= olen; 2798 i += TCPOLEN_SACK) { 2799 memcpy(&sack, &opt[i], sizeof(sack)); 2800 pf_patch_32_unaligned(m, 2801 &th->th_sum, &sack.start, 2802 htonl(ntohl(sack.start) - dst->seqdiff), 2803 PF_ALGNMNT(startoff), 2804 0); 2805 pf_patch_32_unaligned(m, &th->th_sum, 2806 &sack.end, 2807 htonl(ntohl(sack.end) - dst->seqdiff), 2808 PF_ALGNMNT(startoff), 2809 0); 2810 memcpy(&opt[i], &sack, sizeof(sack)); 2811 } 2812 copyback = 1; 2813 } 2814 /* FALLTHROUGH */ 2815 default: 2816 if (olen < 2) 2817 olen = 2; 2818 hlen -= olen; 2819 opt += olen; 2820 } 2821 } 2822 2823 if (copyback) 2824 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2825 return (copyback); 2826 } 2827 2828 struct mbuf * 2829 pf_build_tcp(const struct pf_krule *r, sa_family_t af, 2830 const struct pf_addr *saddr, const struct pf_addr *daddr, 2831 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2832 u_int8_t tcp_flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, 2833 bool skip_firewall, u_int16_t mtag_tag, u_int16_t mtag_flags, int rtableid) 2834 { 2835 struct mbuf *m; 2836 int len, tlen; 2837 #ifdef INET 2838 struct ip *h = NULL; 2839 #endif /* INET */ 2840 #ifdef INET6 2841 struct ip6_hdr *h6 = NULL; 2842 #endif /* INET6 */ 2843 struct tcphdr *th; 2844 char *opt; 2845 struct pf_mtag *pf_mtag; 2846 2847 len = 0; 2848 th = NULL; 2849 2850 /* maximum segment size tcp option */ 2851 tlen = sizeof(struct tcphdr); 2852 if (mss) 2853 tlen += 4; 2854 2855 switch (af) { 2856 #ifdef INET 2857 case AF_INET: 2858 len = sizeof(struct ip) + tlen; 2859 break; 2860 #endif /* INET */ 2861 #ifdef INET6 2862 case AF_INET6: 2863 len = sizeof(struct ip6_hdr) + tlen; 2864 break; 2865 #endif /* INET6 */ 2866 default: 2867 panic("%s: unsupported af %d", __func__, af); 2868 } 2869 2870 m = m_gethdr(M_NOWAIT, MT_DATA); 2871 if (m == NULL) 2872 return (NULL); 2873 2874 #ifdef MAC 2875 mac_netinet_firewall_send(m); 2876 #endif 2877 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2878 m_freem(m); 2879 return (NULL); 2880 } 2881 if (skip_firewall) 2882 m->m_flags |= M_SKIP_FIREWALL; 2883 pf_mtag->tag = mtag_tag; 2884 pf_mtag->flags = mtag_flags; 2885 2886 if (rtableid >= 0) 2887 M_SETFIB(m, rtableid); 2888 2889 #ifdef ALTQ 2890 if (r != NULL && r->qid) { 2891 pf_mtag->qid = r->qid; 2892 2893 /* add hints for ecn */ 2894 pf_mtag->hdr = mtod(m, struct ip *); 2895 } 2896 #endif /* ALTQ */ 2897 m->m_data += max_linkhdr; 2898 m->m_pkthdr.len = m->m_len = len; 2899 /* The rest of the stack assumes a rcvif, so provide one. 2900 * This is a locally generated packet, so .. close enough. */ 2901 m->m_pkthdr.rcvif = V_loif; 2902 bzero(m->m_data, len); 2903 switch (af) { 2904 #ifdef INET 2905 case AF_INET: 2906 h = mtod(m, struct ip *); 2907 2908 /* IP header fields included in the TCP checksum */ 2909 h->ip_p = IPPROTO_TCP; 2910 h->ip_len = htons(tlen); 2911 h->ip_src.s_addr = saddr->v4.s_addr; 2912 h->ip_dst.s_addr = daddr->v4.s_addr; 2913 2914 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2915 break; 2916 #endif /* INET */ 2917 #ifdef INET6 2918 case AF_INET6: 2919 h6 = mtod(m, struct ip6_hdr *); 2920 2921 /* IP header fields included in the TCP checksum */ 2922 h6->ip6_nxt = IPPROTO_TCP; 2923 h6->ip6_plen = htons(tlen); 2924 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2925 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2926 2927 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2928 break; 2929 #endif /* INET6 */ 2930 } 2931 2932 /* TCP header */ 2933 th->th_sport = sport; 2934 th->th_dport = dport; 2935 th->th_seq = htonl(seq); 2936 th->th_ack = htonl(ack); 2937 th->th_off = tlen >> 2; 2938 th->th_flags = tcp_flags; 2939 th->th_win = htons(win); 2940 2941 if (mss) { 2942 opt = (char *)(th + 1); 2943 opt[0] = TCPOPT_MAXSEG; 2944 opt[1] = 4; 2945 HTONS(mss); 2946 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2947 } 2948 2949 switch (af) { 2950 #ifdef INET 2951 case AF_INET: 2952 /* TCP checksum */ 2953 th->th_sum = in_cksum(m, len); 2954 2955 /* Finish the IP header */ 2956 h->ip_v = 4; 2957 h->ip_hl = sizeof(*h) >> 2; 2958 h->ip_tos = IPTOS_LOWDELAY; 2959 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2960 h->ip_len = htons(len); 2961 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2962 h->ip_sum = 0; 2963 break; 2964 #endif /* INET */ 2965 #ifdef INET6 2966 case AF_INET6: 2967 /* TCP checksum */ 2968 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2969 sizeof(struct ip6_hdr), tlen); 2970 2971 h6->ip6_vfc |= IPV6_VERSION; 2972 h6->ip6_hlim = IPV6_DEFHLIM; 2973 break; 2974 #endif /* INET6 */ 2975 } 2976 2977 return (m); 2978 } 2979 2980 static void 2981 pf_send_sctp_abort(sa_family_t af, struct pf_pdesc *pd, 2982 uint8_t ttl, int rtableid) 2983 { 2984 struct mbuf *m; 2985 #ifdef INET 2986 struct ip *h = NULL; 2987 #endif /* INET */ 2988 #ifdef INET6 2989 struct ip6_hdr *h6 = NULL; 2990 #endif /* INET6 */ 2991 struct sctphdr *hdr; 2992 struct sctp_chunkhdr *chunk; 2993 struct pf_send_entry *pfse; 2994 int off = 0; 2995 2996 MPASS(af == pd->af); 2997 2998 m = m_gethdr(M_NOWAIT, MT_DATA); 2999 if (m == NULL) 3000 return; 3001 3002 m->m_data += max_linkhdr; 3003 m->m_flags |= M_SKIP_FIREWALL; 3004 /* The rest of the stack assumes a rcvif, so provide one. 3005 * This is a locally generated packet, so .. close enough. */ 3006 m->m_pkthdr.rcvif = V_loif; 3007 3008 /* IPv4|6 header */ 3009 switch (af) { 3010 #ifdef INET 3011 case AF_INET: 3012 bzero(m->m_data, sizeof(struct ip) + sizeof(*hdr) + sizeof(*chunk)); 3013 3014 h = mtod(m, struct ip *); 3015 3016 /* IP header fields included in the TCP checksum */ 3017 3018 h->ip_p = IPPROTO_SCTP; 3019 h->ip_len = htons(sizeof(*h) + sizeof(*hdr) + sizeof(*chunk)); 3020 h->ip_ttl = ttl ? ttl : V_ip_defttl; 3021 h->ip_src = pd->dst->v4; 3022 h->ip_dst = pd->src->v4; 3023 3024 off += sizeof(struct ip); 3025 break; 3026 #endif /* INET */ 3027 #ifdef INET6 3028 case AF_INET6: 3029 bzero(m->m_data, sizeof(struct ip6_hdr) + sizeof(*hdr) + sizeof(*chunk)); 3030 3031 h6 = mtod(m, struct ip6_hdr *); 3032 3033 /* IP header fields included in the TCP checksum */ 3034 h6->ip6_vfc |= IPV6_VERSION; 3035 h6->ip6_nxt = IPPROTO_SCTP; 3036 h6->ip6_plen = htons(sizeof(*h6) + sizeof(*hdr) + sizeof(*chunk)); 3037 h6->ip6_hlim = ttl ? ttl : V_ip6_defhlim; 3038 memcpy(&h6->ip6_src, &pd->dst->v6, sizeof(struct in6_addr)); 3039 memcpy(&h6->ip6_dst, &pd->src->v6, sizeof(struct in6_addr)); 3040 3041 off += sizeof(struct ip6_hdr); 3042 break; 3043 #endif /* INET6 */ 3044 } 3045 3046 /* SCTP header */ 3047 hdr = mtodo(m, off); 3048 3049 hdr->src_port = pd->hdr.sctp.dest_port; 3050 hdr->dest_port = pd->hdr.sctp.src_port; 3051 hdr->v_tag = pd->sctp_initiate_tag; 3052 hdr->checksum = 0; 3053 3054 /* Abort chunk. */ 3055 off += sizeof(struct sctphdr); 3056 chunk = mtodo(m, off); 3057 3058 chunk->chunk_type = SCTP_ABORT_ASSOCIATION; 3059 chunk->chunk_length = htons(sizeof(*chunk)); 3060 3061 /* SCTP checksum */ 3062 off += sizeof(*chunk); 3063 m->m_pkthdr.len = m->m_len = off; 3064 3065 pf_sctp_checksum(m, off - sizeof(*hdr) - sizeof(*chunk));; 3066 3067 if (rtableid >= 0) 3068 M_SETFIB(m, rtableid); 3069 3070 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3071 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3072 if (pfse == NULL) { 3073 m_freem(m); 3074 return; 3075 } 3076 3077 switch (af) { 3078 #ifdef INET 3079 case AF_INET: 3080 pfse->pfse_type = PFSE_IP; 3081 break; 3082 #endif /* INET */ 3083 #ifdef INET6 3084 case AF_INET6: 3085 pfse->pfse_type = PFSE_IP6; 3086 break; 3087 #endif /* INET6 */ 3088 } 3089 3090 pfse->pfse_m = m; 3091 pf_send(pfse); 3092 } 3093 3094 void 3095 pf_send_tcp(const struct pf_krule *r, sa_family_t af, 3096 const struct pf_addr *saddr, const struct pf_addr *daddr, 3097 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 3098 u_int8_t tcp_flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, 3099 bool skip_firewall, u_int16_t mtag_tag, u_int16_t mtag_flags, int rtableid) 3100 { 3101 struct pf_send_entry *pfse; 3102 struct mbuf *m; 3103 3104 m = pf_build_tcp(r, af, saddr, daddr, sport, dport, seq, ack, tcp_flags, 3105 win, mss, ttl, skip_firewall, mtag_tag, mtag_flags, rtableid); 3106 if (m == NULL) 3107 return; 3108 3109 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3110 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3111 if (pfse == NULL) { 3112 m_freem(m); 3113 return; 3114 } 3115 3116 switch (af) { 3117 #ifdef INET 3118 case AF_INET: 3119 pfse->pfse_type = PFSE_IP; 3120 break; 3121 #endif /* INET */ 3122 #ifdef INET6 3123 case AF_INET6: 3124 pfse->pfse_type = PFSE_IP6; 3125 break; 3126 #endif /* INET6 */ 3127 } 3128 3129 pfse->pfse_m = m; 3130 pf_send(pfse); 3131 } 3132 3133 static void 3134 pf_return(struct pf_krule *r, struct pf_krule *nr, struct pf_pdesc *pd, 3135 struct pf_state_key *sk, int off, struct mbuf *m, struct tcphdr *th, 3136 struct pfi_kkif *kif, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen, 3137 u_short *reason, int rtableid) 3138 { 3139 struct pf_addr * const saddr = pd->src; 3140 struct pf_addr * const daddr = pd->dst; 3141 sa_family_t af = pd->af; 3142 3143 /* undo NAT changes, if they have taken place */ 3144 if (nr != NULL) { 3145 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3146 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3147 if (pd->sport) 3148 *pd->sport = sk->port[pd->sidx]; 3149 if (pd->dport) 3150 *pd->dport = sk->port[pd->didx]; 3151 if (pd->proto_sum) 3152 *pd->proto_sum = bproto_sum; 3153 if (pd->ip_sum) 3154 *pd->ip_sum = bip_sum; 3155 m_copyback(m, off, hdrlen, pd->hdr.any); 3156 } 3157 if (pd->proto == IPPROTO_TCP && 3158 ((r->rule_flag & PFRULE_RETURNRST) || 3159 (r->rule_flag & PFRULE_RETURN)) && 3160 !(th->th_flags & TH_RST)) { 3161 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3162 int len = 0; 3163 #ifdef INET 3164 struct ip *h4; 3165 #endif 3166 #ifdef INET6 3167 struct ip6_hdr *h6; 3168 #endif 3169 3170 switch (af) { 3171 #ifdef INET 3172 case AF_INET: 3173 h4 = mtod(m, struct ip *); 3174 len = ntohs(h4->ip_len) - off; 3175 break; 3176 #endif 3177 #ifdef INET6 3178 case AF_INET6: 3179 h6 = mtod(m, struct ip6_hdr *); 3180 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3181 break; 3182 #endif 3183 } 3184 3185 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3186 REASON_SET(reason, PFRES_PROTCKSUM); 3187 else { 3188 if (th->th_flags & TH_SYN) 3189 ack++; 3190 if (th->th_flags & TH_FIN) 3191 ack++; 3192 pf_send_tcp(r, af, pd->dst, 3193 pd->src, th->th_dport, th->th_sport, 3194 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3195 r->return_ttl, true, 0, 0, rtableid); 3196 } 3197 } else if (pd->proto == IPPROTO_SCTP && 3198 (r->rule_flag & PFRULE_RETURN)) { 3199 pf_send_sctp_abort(af, pd, r->return_ttl, rtableid); 3200 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3201 r->return_icmp) 3202 pf_send_icmp(m, r->return_icmp >> 8, 3203 r->return_icmp & 255, af, r, rtableid); 3204 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3205 r->return_icmp6) 3206 pf_send_icmp(m, r->return_icmp6 >> 8, 3207 r->return_icmp6 & 255, af, r, rtableid); 3208 } 3209 3210 static int 3211 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m) 3212 { 3213 struct m_tag *mtag; 3214 u_int8_t mpcp; 3215 3216 mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL); 3217 if (mtag == NULL) 3218 return (0); 3219 3220 if (prio == PF_PRIO_ZERO) 3221 prio = 0; 3222 3223 mpcp = *(uint8_t *)(mtag + 1); 3224 3225 return (mpcp == prio); 3226 } 3227 3228 static int 3229 pf_icmp_to_bandlim(uint8_t type) 3230 { 3231 switch (type) { 3232 case ICMP_ECHO: 3233 case ICMP_ECHOREPLY: 3234 return (BANDLIM_ICMP_ECHO); 3235 case ICMP_TSTAMP: 3236 case ICMP_TSTAMPREPLY: 3237 return (BANDLIM_ICMP_TSTAMP); 3238 case ICMP_UNREACH: 3239 default: 3240 return (BANDLIM_ICMP_UNREACH); 3241 } 3242 } 3243 3244 static void 3245 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 3246 struct pf_krule *r, int rtableid) 3247 { 3248 struct pf_send_entry *pfse; 3249 struct mbuf *m0; 3250 struct pf_mtag *pf_mtag; 3251 3252 /* ICMP packet rate limitation. */ 3253 #ifdef INET6 3254 if (af == AF_INET6) { 3255 if (icmp6_ratelimit(NULL, type, code)) 3256 return; 3257 } 3258 #endif 3259 #ifdef INET 3260 if (af == AF_INET) { 3261 if (badport_bandlim(pf_icmp_to_bandlim(type)) != 0) 3262 return; 3263 } 3264 #endif 3265 3266 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3267 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3268 if (pfse == NULL) 3269 return; 3270 3271 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 3272 free(pfse, M_PFTEMP); 3273 return; 3274 } 3275 3276 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 3277 free(pfse, M_PFTEMP); 3278 return; 3279 } 3280 /* XXX: revisit */ 3281 m0->m_flags |= M_SKIP_FIREWALL; 3282 3283 if (rtableid >= 0) 3284 M_SETFIB(m0, rtableid); 3285 3286 #ifdef ALTQ 3287 if (r->qid) { 3288 pf_mtag->qid = r->qid; 3289 /* add hints for ecn */ 3290 pf_mtag->hdr = mtod(m0, struct ip *); 3291 } 3292 #endif /* ALTQ */ 3293 3294 switch (af) { 3295 #ifdef INET 3296 case AF_INET: 3297 pfse->pfse_type = PFSE_ICMP; 3298 break; 3299 #endif /* INET */ 3300 #ifdef INET6 3301 case AF_INET6: 3302 pfse->pfse_type = PFSE_ICMP6; 3303 break; 3304 #endif /* INET6 */ 3305 } 3306 pfse->pfse_m = m0; 3307 pfse->icmpopts.type = type; 3308 pfse->icmpopts.code = code; 3309 pf_send(pfse); 3310 } 3311 3312 /* 3313 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 3314 * If n is 0, they match if they are equal. If n is != 0, they match if they 3315 * are different. 3316 */ 3317 int 3318 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 3319 struct pf_addr *b, sa_family_t af) 3320 { 3321 int match = 0; 3322 3323 switch (af) { 3324 #ifdef INET 3325 case AF_INET: 3326 if ((a->addr32[0] & m->addr32[0]) == 3327 (b->addr32[0] & m->addr32[0])) 3328 match++; 3329 break; 3330 #endif /* INET */ 3331 #ifdef INET6 3332 case AF_INET6: 3333 if (((a->addr32[0] & m->addr32[0]) == 3334 (b->addr32[0] & m->addr32[0])) && 3335 ((a->addr32[1] & m->addr32[1]) == 3336 (b->addr32[1] & m->addr32[1])) && 3337 ((a->addr32[2] & m->addr32[2]) == 3338 (b->addr32[2] & m->addr32[2])) && 3339 ((a->addr32[3] & m->addr32[3]) == 3340 (b->addr32[3] & m->addr32[3]))) 3341 match++; 3342 break; 3343 #endif /* INET6 */ 3344 } 3345 if (match) { 3346 if (n) 3347 return (0); 3348 else 3349 return (1); 3350 } else { 3351 if (n) 3352 return (1); 3353 else 3354 return (0); 3355 } 3356 } 3357 3358 /* 3359 * Return 1 if b <= a <= e, otherwise return 0. 3360 */ 3361 int 3362 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 3363 struct pf_addr *a, sa_family_t af) 3364 { 3365 switch (af) { 3366 #ifdef INET 3367 case AF_INET: 3368 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) || 3369 (ntohl(a->addr32[0]) > ntohl(e->addr32[0]))) 3370 return (0); 3371 break; 3372 #endif /* INET */ 3373 #ifdef INET6 3374 case AF_INET6: { 3375 int i; 3376 3377 /* check a >= b */ 3378 for (i = 0; i < 4; ++i) 3379 if (ntohl(a->addr32[i]) > ntohl(b->addr32[i])) 3380 break; 3381 else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i])) 3382 return (0); 3383 /* check a <= e */ 3384 for (i = 0; i < 4; ++i) 3385 if (ntohl(a->addr32[i]) < ntohl(e->addr32[i])) 3386 break; 3387 else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i])) 3388 return (0); 3389 break; 3390 } 3391 #endif /* INET6 */ 3392 } 3393 return (1); 3394 } 3395 3396 static int 3397 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 3398 { 3399 switch (op) { 3400 case PF_OP_IRG: 3401 return ((p > a1) && (p < a2)); 3402 case PF_OP_XRG: 3403 return ((p < a1) || (p > a2)); 3404 case PF_OP_RRG: 3405 return ((p >= a1) && (p <= a2)); 3406 case PF_OP_EQ: 3407 return (p == a1); 3408 case PF_OP_NE: 3409 return (p != a1); 3410 case PF_OP_LT: 3411 return (p < a1); 3412 case PF_OP_LE: 3413 return (p <= a1); 3414 case PF_OP_GT: 3415 return (p > a1); 3416 case PF_OP_GE: 3417 return (p >= a1); 3418 } 3419 return (0); /* never reached */ 3420 } 3421 3422 int 3423 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 3424 { 3425 NTOHS(a1); 3426 NTOHS(a2); 3427 NTOHS(p); 3428 return (pf_match(op, a1, a2, p)); 3429 } 3430 3431 static int 3432 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 3433 { 3434 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 3435 return (0); 3436 return (pf_match(op, a1, a2, u)); 3437 } 3438 3439 static int 3440 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 3441 { 3442 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 3443 return (0); 3444 return (pf_match(op, a1, a2, g)); 3445 } 3446 3447 int 3448 pf_match_tag(struct mbuf *m, struct pf_krule *r, int *tag, int mtag) 3449 { 3450 if (*tag == -1) 3451 *tag = mtag; 3452 3453 return ((!r->match_tag_not && r->match_tag == *tag) || 3454 (r->match_tag_not && r->match_tag != *tag)); 3455 } 3456 3457 int 3458 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 3459 { 3460 3461 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 3462 3463 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 3464 return (ENOMEM); 3465 3466 pd->pf_mtag->tag = tag; 3467 3468 return (0); 3469 } 3470 3471 #define PF_ANCHOR_STACKSIZE 32 3472 struct pf_kanchor_stackframe { 3473 struct pf_kruleset *rs; 3474 struct pf_krule *r; /* XXX: + match bit */ 3475 struct pf_kanchor *child; 3476 }; 3477 3478 /* 3479 * XXX: We rely on malloc(9) returning pointer aligned addresses. 3480 */ 3481 #define PF_ANCHORSTACK_MATCH 0x00000001 3482 #define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 3483 3484 #define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 3485 #define PF_ANCHOR_RULE(f) (struct pf_krule *) \ 3486 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 3487 #define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 3488 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 3489 } while (0) 3490 3491 void 3492 pf_step_into_anchor(struct pf_kanchor_stackframe *stack, int *depth, 3493 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, 3494 int *match) 3495 { 3496 struct pf_kanchor_stackframe *f; 3497 3498 PF_RULES_RASSERT(); 3499 3500 if (match) 3501 *match = 0; 3502 if (*depth >= PF_ANCHOR_STACKSIZE) { 3503 printf("%s: anchor stack overflow on %s\n", 3504 __func__, (*r)->anchor->name); 3505 *r = TAILQ_NEXT(*r, entries); 3506 return; 3507 } else if (*depth == 0 && a != NULL) 3508 *a = *r; 3509 f = stack + (*depth)++; 3510 f->rs = *rs; 3511 f->r = *r; 3512 if ((*r)->anchor_wildcard) { 3513 struct pf_kanchor_node *parent = &(*r)->anchor->children; 3514 3515 if ((f->child = RB_MIN(pf_kanchor_node, parent)) == NULL) { 3516 *r = NULL; 3517 return; 3518 } 3519 *rs = &f->child->ruleset; 3520 } else { 3521 f->child = NULL; 3522 *rs = &(*r)->anchor->ruleset; 3523 } 3524 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 3525 } 3526 3527 int 3528 pf_step_out_of_anchor(struct pf_kanchor_stackframe *stack, int *depth, 3529 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, 3530 int *match) 3531 { 3532 struct pf_kanchor_stackframe *f; 3533 struct pf_krule *fr; 3534 int quick = 0; 3535 3536 PF_RULES_RASSERT(); 3537 3538 do { 3539 if (*depth <= 0) 3540 break; 3541 f = stack + *depth - 1; 3542 fr = PF_ANCHOR_RULE(f); 3543 if (f->child != NULL) { 3544 /* 3545 * This block traverses through 3546 * a wildcard anchor. 3547 */ 3548 if (match != NULL && *match) { 3549 /* 3550 * If any of "*" matched, then 3551 * "foo/ *" matched, mark frame 3552 * appropriately. 3553 */ 3554 PF_ANCHOR_SET_MATCH(f); 3555 *match = 0; 3556 } 3557 f->child = RB_NEXT(pf_kanchor_node, 3558 &fr->anchor->children, f->child); 3559 if (f->child != NULL) { 3560 *rs = &f->child->ruleset; 3561 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 3562 if (*r == NULL) 3563 continue; 3564 else 3565 break; 3566 } 3567 } 3568 (*depth)--; 3569 if (*depth == 0 && a != NULL) 3570 *a = NULL; 3571 *rs = f->rs; 3572 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 3573 quick = fr->quick; 3574 *r = TAILQ_NEXT(fr, entries); 3575 } while (*r == NULL); 3576 3577 return (quick); 3578 } 3579 3580 struct pf_keth_anchor_stackframe { 3581 struct pf_keth_ruleset *rs; 3582 struct pf_keth_rule *r; /* XXX: + match bit */ 3583 struct pf_keth_anchor *child; 3584 }; 3585 3586 #define PF_ETH_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 3587 #define PF_ETH_ANCHOR_RULE(f) (struct pf_keth_rule *) \ 3588 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 3589 #define PF_ETH_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 3590 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 3591 } while (0) 3592 3593 void 3594 pf_step_into_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth, 3595 struct pf_keth_ruleset **rs, struct pf_keth_rule **r, 3596 struct pf_keth_rule **a, int *match) 3597 { 3598 struct pf_keth_anchor_stackframe *f; 3599 3600 NET_EPOCH_ASSERT(); 3601 3602 if (match) 3603 *match = 0; 3604 if (*depth >= PF_ANCHOR_STACKSIZE) { 3605 printf("%s: anchor stack overflow on %s\n", 3606 __func__, (*r)->anchor->name); 3607 *r = TAILQ_NEXT(*r, entries); 3608 return; 3609 } else if (*depth == 0 && a != NULL) 3610 *a = *r; 3611 f = stack + (*depth)++; 3612 f->rs = *rs; 3613 f->r = *r; 3614 if ((*r)->anchor_wildcard) { 3615 struct pf_keth_anchor_node *parent = &(*r)->anchor->children; 3616 3617 if ((f->child = RB_MIN(pf_keth_anchor_node, parent)) == NULL) { 3618 *r = NULL; 3619 return; 3620 } 3621 *rs = &f->child->ruleset; 3622 } else { 3623 f->child = NULL; 3624 *rs = &(*r)->anchor->ruleset; 3625 } 3626 *r = TAILQ_FIRST((*rs)->active.rules); 3627 } 3628 3629 int 3630 pf_step_out_of_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth, 3631 struct pf_keth_ruleset **rs, struct pf_keth_rule **r, 3632 struct pf_keth_rule **a, int *match) 3633 { 3634 struct pf_keth_anchor_stackframe *f; 3635 struct pf_keth_rule *fr; 3636 int quick = 0; 3637 3638 NET_EPOCH_ASSERT(); 3639 3640 do { 3641 if (*depth <= 0) 3642 break; 3643 f = stack + *depth - 1; 3644 fr = PF_ETH_ANCHOR_RULE(f); 3645 if (f->child != NULL) { 3646 /* 3647 * This block traverses through 3648 * a wildcard anchor. 3649 */ 3650 if (match != NULL && *match) { 3651 /* 3652 * If any of "*" matched, then 3653 * "foo/ *" matched, mark frame 3654 * appropriately. 3655 */ 3656 PF_ETH_ANCHOR_SET_MATCH(f); 3657 *match = 0; 3658 } 3659 f->child = RB_NEXT(pf_keth_anchor_node, 3660 &fr->anchor->children, f->child); 3661 if (f->child != NULL) { 3662 *rs = &f->child->ruleset; 3663 *r = TAILQ_FIRST((*rs)->active.rules); 3664 if (*r == NULL) 3665 continue; 3666 else 3667 break; 3668 } 3669 } 3670 (*depth)--; 3671 if (*depth == 0 && a != NULL) 3672 *a = NULL; 3673 *rs = f->rs; 3674 if (PF_ETH_ANCHOR_MATCH(f) || (match != NULL && *match)) 3675 quick = fr->quick; 3676 *r = TAILQ_NEXT(fr, entries); 3677 } while (*r == NULL); 3678 3679 return (quick); 3680 } 3681 3682 #ifdef INET6 3683 void 3684 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 3685 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 3686 { 3687 switch (af) { 3688 #ifdef INET 3689 case AF_INET: 3690 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3691 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3692 break; 3693 #endif /* INET */ 3694 case AF_INET6: 3695 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3696 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3697 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 3698 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 3699 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 3700 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 3701 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 3702 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 3703 break; 3704 } 3705 } 3706 3707 void 3708 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 3709 { 3710 switch (af) { 3711 #ifdef INET 3712 case AF_INET: 3713 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 3714 break; 3715 #endif /* INET */ 3716 case AF_INET6: 3717 if (addr->addr32[3] == 0xffffffff) { 3718 addr->addr32[3] = 0; 3719 if (addr->addr32[2] == 0xffffffff) { 3720 addr->addr32[2] = 0; 3721 if (addr->addr32[1] == 0xffffffff) { 3722 addr->addr32[1] = 0; 3723 addr->addr32[0] = 3724 htonl(ntohl(addr->addr32[0]) + 1); 3725 } else 3726 addr->addr32[1] = 3727 htonl(ntohl(addr->addr32[1]) + 1); 3728 } else 3729 addr->addr32[2] = 3730 htonl(ntohl(addr->addr32[2]) + 1); 3731 } else 3732 addr->addr32[3] = 3733 htonl(ntohl(addr->addr32[3]) + 1); 3734 break; 3735 } 3736 } 3737 #endif /* INET6 */ 3738 3739 void 3740 pf_rule_to_actions(struct pf_krule *r, struct pf_rule_actions *a) 3741 { 3742 /* 3743 * Modern rules use the same flags in rules as they do in states. 3744 */ 3745 a->flags |= (r->scrub_flags & (PFSTATE_NODF|PFSTATE_RANDOMID| 3746 PFSTATE_SCRUB_TCP|PFSTATE_SETPRIO)); 3747 3748 /* 3749 * Old-style scrub rules have different flags which need to be translated. 3750 */ 3751 if (r->rule_flag & PFRULE_RANDOMID) 3752 a->flags |= PFSTATE_RANDOMID; 3753 if (r->scrub_flags & PFSTATE_SETTOS || r->rule_flag & PFRULE_SET_TOS ) { 3754 a->flags |= PFSTATE_SETTOS; 3755 a->set_tos = r->set_tos; 3756 } 3757 3758 if (r->qid) 3759 a->qid = r->qid; 3760 if (r->pqid) 3761 a->pqid = r->pqid; 3762 if (r->rtableid >= 0) 3763 a->rtableid = r->rtableid; 3764 a->log |= r->log; 3765 if (r->min_ttl) 3766 a->min_ttl = r->min_ttl; 3767 if (r->max_mss) 3768 a->max_mss = r->max_mss; 3769 if (r->dnpipe) 3770 a->dnpipe = r->dnpipe; 3771 if (r->dnrpipe) 3772 a->dnrpipe = r->dnrpipe; 3773 if (r->dnpipe || r->dnrpipe) { 3774 if (r->free_flags & PFRULE_DN_IS_PIPE) 3775 a->flags |= PFSTATE_DN_IS_PIPE; 3776 else 3777 a->flags &= ~PFSTATE_DN_IS_PIPE; 3778 } 3779 if (r->scrub_flags & PFSTATE_SETPRIO) { 3780 a->set_prio[0] = r->set_prio[0]; 3781 a->set_prio[1] = r->set_prio[1]; 3782 } 3783 } 3784 3785 int 3786 pf_socket_lookup(struct pf_pdesc *pd, struct mbuf *m) 3787 { 3788 struct pf_addr *saddr, *daddr; 3789 u_int16_t sport, dport; 3790 struct inpcbinfo *pi; 3791 struct inpcb *inp; 3792 3793 pd->lookup.uid = UID_MAX; 3794 pd->lookup.gid = GID_MAX; 3795 3796 switch (pd->proto) { 3797 case IPPROTO_TCP: 3798 sport = pd->hdr.tcp.th_sport; 3799 dport = pd->hdr.tcp.th_dport; 3800 pi = &V_tcbinfo; 3801 break; 3802 case IPPROTO_UDP: 3803 sport = pd->hdr.udp.uh_sport; 3804 dport = pd->hdr.udp.uh_dport; 3805 pi = &V_udbinfo; 3806 break; 3807 default: 3808 return (-1); 3809 } 3810 if (pd->dir == PF_IN) { 3811 saddr = pd->src; 3812 daddr = pd->dst; 3813 } else { 3814 u_int16_t p; 3815 3816 p = sport; 3817 sport = dport; 3818 dport = p; 3819 saddr = pd->dst; 3820 daddr = pd->src; 3821 } 3822 switch (pd->af) { 3823 #ifdef INET 3824 case AF_INET: 3825 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 3826 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3827 if (inp == NULL) { 3828 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 3829 daddr->v4, dport, INPLOOKUP_WILDCARD | 3830 INPLOOKUP_RLOCKPCB, NULL, m); 3831 if (inp == NULL) 3832 return (-1); 3833 } 3834 break; 3835 #endif /* INET */ 3836 #ifdef INET6 3837 case AF_INET6: 3838 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 3839 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3840 if (inp == NULL) { 3841 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 3842 &daddr->v6, dport, INPLOOKUP_WILDCARD | 3843 INPLOOKUP_RLOCKPCB, NULL, m); 3844 if (inp == NULL) 3845 return (-1); 3846 } 3847 break; 3848 #endif /* INET6 */ 3849 3850 default: 3851 return (-1); 3852 } 3853 INP_RLOCK_ASSERT(inp); 3854 pd->lookup.uid = inp->inp_cred->cr_uid; 3855 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3856 INP_RUNLOCK(inp); 3857 3858 return (1); 3859 } 3860 3861 u_int8_t 3862 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3863 { 3864 int hlen; 3865 u_int8_t hdr[60]; 3866 u_int8_t *opt, optlen; 3867 u_int8_t wscale = 0; 3868 3869 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3870 if (hlen <= sizeof(struct tcphdr)) 3871 return (0); 3872 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3873 return (0); 3874 opt = hdr + sizeof(struct tcphdr); 3875 hlen -= sizeof(struct tcphdr); 3876 while (hlen >= 3) { 3877 switch (*opt) { 3878 case TCPOPT_EOL: 3879 case TCPOPT_NOP: 3880 ++opt; 3881 --hlen; 3882 break; 3883 case TCPOPT_WINDOW: 3884 wscale = opt[2]; 3885 if (wscale > TCP_MAX_WINSHIFT) 3886 wscale = TCP_MAX_WINSHIFT; 3887 wscale |= PF_WSCALE_FLAG; 3888 /* FALLTHROUGH */ 3889 default: 3890 optlen = opt[1]; 3891 if (optlen < 2) 3892 optlen = 2; 3893 hlen -= optlen; 3894 opt += optlen; 3895 break; 3896 } 3897 } 3898 return (wscale); 3899 } 3900 3901 u_int16_t 3902 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3903 { 3904 int hlen; 3905 u_int8_t hdr[60]; 3906 u_int8_t *opt, optlen; 3907 u_int16_t mss = V_tcp_mssdflt; 3908 3909 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3910 if (hlen <= sizeof(struct tcphdr)) 3911 return (0); 3912 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3913 return (0); 3914 opt = hdr + sizeof(struct tcphdr); 3915 hlen -= sizeof(struct tcphdr); 3916 while (hlen >= TCPOLEN_MAXSEG) { 3917 switch (*opt) { 3918 case TCPOPT_EOL: 3919 case TCPOPT_NOP: 3920 ++opt; 3921 --hlen; 3922 break; 3923 case TCPOPT_MAXSEG: 3924 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3925 NTOHS(mss); 3926 /* FALLTHROUGH */ 3927 default: 3928 optlen = opt[1]; 3929 if (optlen < 2) 3930 optlen = 2; 3931 hlen -= optlen; 3932 opt += optlen; 3933 break; 3934 } 3935 } 3936 return (mss); 3937 } 3938 3939 static u_int16_t 3940 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 3941 { 3942 struct nhop_object *nh; 3943 #ifdef INET6 3944 struct in6_addr dst6; 3945 uint32_t scopeid; 3946 #endif /* INET6 */ 3947 int hlen = 0; 3948 uint16_t mss = 0; 3949 3950 NET_EPOCH_ASSERT(); 3951 3952 switch (af) { 3953 #ifdef INET 3954 case AF_INET: 3955 hlen = sizeof(struct ip); 3956 nh = fib4_lookup(rtableid, addr->v4, 0, 0, 0); 3957 if (nh != NULL) 3958 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 3959 break; 3960 #endif /* INET */ 3961 #ifdef INET6 3962 case AF_INET6: 3963 hlen = sizeof(struct ip6_hdr); 3964 in6_splitscope(&addr->v6, &dst6, &scopeid); 3965 nh = fib6_lookup(rtableid, &dst6, scopeid, 0, 0); 3966 if (nh != NULL) 3967 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 3968 break; 3969 #endif /* INET6 */ 3970 } 3971 3972 mss = max(V_tcp_mssdflt, mss); 3973 mss = min(mss, offer); 3974 mss = max(mss, 64); /* sanity - at least max opt space */ 3975 return (mss); 3976 } 3977 3978 static u_int32_t 3979 pf_tcp_iss(struct pf_pdesc *pd) 3980 { 3981 MD5_CTX ctx; 3982 u_int32_t digest[4]; 3983 3984 if (V_pf_tcp_secret_init == 0) { 3985 arc4random_buf(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 3986 MD5Init(&V_pf_tcp_secret_ctx); 3987 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 3988 sizeof(V_pf_tcp_secret)); 3989 V_pf_tcp_secret_init = 1; 3990 } 3991 3992 ctx = V_pf_tcp_secret_ctx; 3993 3994 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_sport, sizeof(u_short)); 3995 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_dport, sizeof(u_short)); 3996 if (pd->af == AF_INET6) { 3997 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3998 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3999 } else { 4000 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 4001 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 4002 } 4003 MD5Final((u_char *)digest, &ctx); 4004 V_pf_tcp_iss_off += 4096; 4005 #define ISN_RANDOM_INCREMENT (4096 - 1) 4006 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 4007 V_pf_tcp_iss_off); 4008 #undef ISN_RANDOM_INCREMENT 4009 } 4010 4011 static bool 4012 pf_match_eth_addr(const uint8_t *a, const struct pf_keth_rule_addr *r) 4013 { 4014 bool match = true; 4015 4016 /* Always matches if not set */ 4017 if (! r->isset) 4018 return (!r->neg); 4019 4020 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4021 if ((a[i] & r->mask[i]) != (r->addr[i] & r->mask[i])) { 4022 match = false; 4023 break; 4024 } 4025 } 4026 4027 return (match ^ r->neg); 4028 } 4029 4030 static int 4031 pf_match_eth_tag(struct mbuf *m, struct pf_keth_rule *r, int *tag, int mtag) 4032 { 4033 if (*tag == -1) 4034 *tag = mtag; 4035 4036 return ((!r->match_tag_not && r->match_tag == *tag) || 4037 (r->match_tag_not && r->match_tag != *tag)); 4038 } 4039 4040 static void 4041 pf_bridge_to(struct ifnet *ifp, struct mbuf *m) 4042 { 4043 /* If we don't have the interface drop the packet. */ 4044 if (ifp == NULL) { 4045 m_freem(m); 4046 return; 4047 } 4048 4049 switch (ifp->if_type) { 4050 case IFT_ETHER: 4051 case IFT_XETHER: 4052 case IFT_L2VLAN: 4053 case IFT_BRIDGE: 4054 case IFT_IEEE8023ADLAG: 4055 break; 4056 default: 4057 m_freem(m); 4058 return; 4059 } 4060 4061 ifp->if_transmit(ifp, m); 4062 } 4063 4064 static int 4065 pf_test_eth_rule(int dir, struct pfi_kkif *kif, struct mbuf **m0) 4066 { 4067 #ifdef INET 4068 struct ip ip; 4069 #endif 4070 #ifdef INET6 4071 struct ip6_hdr ip6; 4072 #endif 4073 struct mbuf *m = *m0; 4074 struct ether_header *e; 4075 struct pf_keth_rule *r, *rm, *a = NULL; 4076 struct pf_keth_ruleset *ruleset = NULL; 4077 struct pf_mtag *mtag; 4078 struct pf_keth_ruleq *rules; 4079 struct pf_addr *src = NULL, *dst = NULL; 4080 struct pfi_kkif *bridge_to; 4081 sa_family_t af = 0; 4082 uint16_t proto; 4083 int asd = 0, match = 0; 4084 int tag = -1; 4085 uint8_t action; 4086 struct pf_keth_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 4087 4088 MPASS(kif->pfik_ifp->if_vnet == curvnet); 4089 NET_EPOCH_ASSERT(); 4090 4091 PF_RULES_RLOCK_TRACKER; 4092 4093 SDT_PROBE3(pf, eth, test_rule, entry, dir, kif->pfik_ifp, m); 4094 4095 mtag = pf_find_mtag(m); 4096 if (mtag != NULL && mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 4097 /* Dummynet re-injects packets after they've 4098 * completed their delay. We've already 4099 * processed them, so pass unconditionally. */ 4100 4101 /* But only once. We may see the packet multiple times (e.g. 4102 * PFIL_IN/PFIL_OUT). */ 4103 mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 4104 4105 return (PF_PASS); 4106 } 4107 4108 ruleset = V_pf_keth; 4109 rules = ck_pr_load_ptr(&ruleset->active.rules); 4110 r = TAILQ_FIRST(rules); 4111 rm = NULL; 4112 4113 e = mtod(m, struct ether_header *); 4114 proto = ntohs(e->ether_type); 4115 4116 switch (proto) { 4117 #ifdef INET 4118 case ETHERTYPE_IP: { 4119 if (m_length(m, NULL) < (sizeof(struct ether_header) + 4120 sizeof(ip))) 4121 return (PF_DROP); 4122 4123 af = AF_INET; 4124 m_copydata(m, sizeof(struct ether_header), sizeof(ip), 4125 (caddr_t)&ip); 4126 src = (struct pf_addr *)&ip.ip_src; 4127 dst = (struct pf_addr *)&ip.ip_dst; 4128 break; 4129 } 4130 #endif /* INET */ 4131 #ifdef INET6 4132 case ETHERTYPE_IPV6: { 4133 if (m_length(m, NULL) < (sizeof(struct ether_header) + 4134 sizeof(ip6))) 4135 return (PF_DROP); 4136 4137 af = AF_INET6; 4138 m_copydata(m, sizeof(struct ether_header), sizeof(ip6), 4139 (caddr_t)&ip6); 4140 src = (struct pf_addr *)&ip6.ip6_src; 4141 dst = (struct pf_addr *)&ip6.ip6_dst; 4142 break; 4143 } 4144 #endif /* INET6 */ 4145 } 4146 4147 PF_RULES_RLOCK(); 4148 4149 while (r != NULL) { 4150 counter_u64_add(r->evaluations, 1); 4151 SDT_PROBE2(pf, eth, test_rule, test, r->nr, r); 4152 4153 if (pfi_kkif_match(r->kif, kif) == r->ifnot) { 4154 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4155 "kif"); 4156 r = r->skip[PFE_SKIP_IFP].ptr; 4157 } 4158 else if (r->direction && r->direction != dir) { 4159 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4160 "dir"); 4161 r = r->skip[PFE_SKIP_DIR].ptr; 4162 } 4163 else if (r->proto && r->proto != proto) { 4164 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4165 "proto"); 4166 r = r->skip[PFE_SKIP_PROTO].ptr; 4167 } 4168 else if (! pf_match_eth_addr(e->ether_shost, &r->src)) { 4169 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4170 "src"); 4171 r = r->skip[PFE_SKIP_SRC_ADDR].ptr; 4172 } 4173 else if (! pf_match_eth_addr(e->ether_dhost, &r->dst)) { 4174 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4175 "dst"); 4176 r = r->skip[PFE_SKIP_DST_ADDR].ptr; 4177 } 4178 else if (src != NULL && PF_MISMATCHAW(&r->ipsrc.addr, src, af, 4179 r->ipsrc.neg, kif, M_GETFIB(m))) { 4180 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4181 "ip_src"); 4182 r = r->skip[PFE_SKIP_SRC_IP_ADDR].ptr; 4183 } 4184 else if (dst != NULL && PF_MISMATCHAW(&r->ipdst.addr, dst, af, 4185 r->ipdst.neg, kif, M_GETFIB(m))) { 4186 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4187 "ip_dst"); 4188 r = r->skip[PFE_SKIP_DST_IP_ADDR].ptr; 4189 } 4190 else if (r->match_tag && !pf_match_eth_tag(m, r, &tag, 4191 mtag ? mtag->tag : 0)) { 4192 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4193 "match_tag"); 4194 r = TAILQ_NEXT(r, entries); 4195 } 4196 else { 4197 if (r->tag) 4198 tag = r->tag; 4199 if (r->anchor == NULL) { 4200 /* Rule matches */ 4201 rm = r; 4202 4203 SDT_PROBE2(pf, eth, test_rule, match, r->nr, r); 4204 4205 if (r->quick) 4206 break; 4207 4208 r = TAILQ_NEXT(r, entries); 4209 } else { 4210 pf_step_into_keth_anchor(anchor_stack, &asd, 4211 &ruleset, &r, &a, &match); 4212 } 4213 } 4214 if (r == NULL && pf_step_out_of_keth_anchor(anchor_stack, &asd, 4215 &ruleset, &r, &a, &match)) 4216 break; 4217 } 4218 4219 r = rm; 4220 4221 SDT_PROBE2(pf, eth, test_rule, final_match, (r != NULL ? r->nr : -1), r); 4222 4223 /* Default to pass. */ 4224 if (r == NULL) { 4225 PF_RULES_RUNLOCK(); 4226 return (PF_PASS); 4227 } 4228 4229 /* Execute action. */ 4230 counter_u64_add(r->packets[dir == PF_OUT], 1); 4231 counter_u64_add(r->bytes[dir == PF_OUT], m_length(m, NULL)); 4232 pf_update_timestamp(r); 4233 4234 /* Shortcut. Don't tag if we're just going to drop anyway. */ 4235 if (r->action == PF_DROP) { 4236 PF_RULES_RUNLOCK(); 4237 return (PF_DROP); 4238 } 4239 4240 if (tag > 0) { 4241 if (mtag == NULL) 4242 mtag = pf_get_mtag(m); 4243 if (mtag == NULL) { 4244 PF_RULES_RUNLOCK(); 4245 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4246 return (PF_DROP); 4247 } 4248 mtag->tag = tag; 4249 } 4250 4251 if (r->qid != 0) { 4252 if (mtag == NULL) 4253 mtag = pf_get_mtag(m); 4254 if (mtag == NULL) { 4255 PF_RULES_RUNLOCK(); 4256 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4257 return (PF_DROP); 4258 } 4259 mtag->qid = r->qid; 4260 } 4261 4262 action = r->action; 4263 bridge_to = r->bridge_to; 4264 4265 /* Dummynet */ 4266 if (r->dnpipe) { 4267 struct ip_fw_args dnflow; 4268 4269 /* Drop packet if dummynet is not loaded. */ 4270 if (ip_dn_io_ptr == NULL) { 4271 PF_RULES_RUNLOCK(); 4272 m_freem(m); 4273 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4274 return (PF_DROP); 4275 } 4276 if (mtag == NULL) 4277 mtag = pf_get_mtag(m); 4278 if (mtag == NULL) { 4279 PF_RULES_RUNLOCK(); 4280 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4281 return (PF_DROP); 4282 } 4283 4284 bzero(&dnflow, sizeof(dnflow)); 4285 4286 /* We don't have port numbers here, so we set 0. That means 4287 * that we'll be somewhat limited in distinguishing flows (i.e. 4288 * only based on IP addresses, not based on port numbers), but 4289 * it's better than nothing. */ 4290 dnflow.f_id.dst_port = 0; 4291 dnflow.f_id.src_port = 0; 4292 dnflow.f_id.proto = 0; 4293 4294 dnflow.rule.info = r->dnpipe; 4295 dnflow.rule.info |= IPFW_IS_DUMMYNET; 4296 if (r->dnflags & PFRULE_DN_IS_PIPE) 4297 dnflow.rule.info |= IPFW_IS_PIPE; 4298 4299 dnflow.f_id.extra = dnflow.rule.info; 4300 4301 dnflow.flags = dir == PF_IN ? IPFW_ARGS_IN : IPFW_ARGS_OUT; 4302 dnflow.flags |= IPFW_ARGS_ETHER; 4303 dnflow.ifp = kif->pfik_ifp; 4304 4305 switch (af) { 4306 case AF_INET: 4307 dnflow.f_id.addr_type = 4; 4308 dnflow.f_id.src_ip = src->v4.s_addr; 4309 dnflow.f_id.dst_ip = dst->v4.s_addr; 4310 break; 4311 case AF_INET6: 4312 dnflow.flags |= IPFW_ARGS_IP6; 4313 dnflow.f_id.addr_type = 6; 4314 dnflow.f_id.src_ip6 = src->v6; 4315 dnflow.f_id.dst_ip6 = dst->v6; 4316 break; 4317 } 4318 4319 PF_RULES_RUNLOCK(); 4320 4321 mtag->flags |= PF_MTAG_FLAG_DUMMYNET; 4322 ip_dn_io_ptr(m0, &dnflow); 4323 if (*m0 != NULL) 4324 mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 4325 } else { 4326 PF_RULES_RUNLOCK(); 4327 } 4328 4329 if (action == PF_PASS && bridge_to) { 4330 pf_bridge_to(bridge_to->pfik_ifp, *m0); 4331 *m0 = NULL; /* We've eaten the packet. */ 4332 } 4333 4334 return (action); 4335 } 4336 4337 static int 4338 pf_test_rule(struct pf_krule **rm, struct pf_kstate **sm, struct pfi_kkif *kif, 4339 struct mbuf *m, int off, struct pf_pdesc *pd, struct pf_krule **am, 4340 struct pf_kruleset **rsm, struct inpcb *inp) 4341 { 4342 struct pf_krule *nr = NULL; 4343 struct pf_addr * const saddr = pd->src; 4344 struct pf_addr * const daddr = pd->dst; 4345 sa_family_t af = pd->af; 4346 struct pf_krule *r, *a = NULL; 4347 struct pf_kruleset *ruleset = NULL; 4348 struct pf_krule_slist match_rules; 4349 struct pf_krule_item *ri; 4350 struct pf_ksrc_node *nsn = NULL; 4351 struct tcphdr *th = &pd->hdr.tcp; 4352 struct pf_state_key *sk = NULL, *nk = NULL; 4353 u_short reason; 4354 int rewrite = 0, hdrlen = 0; 4355 int tag = -1; 4356 int asd = 0; 4357 int match = 0; 4358 int state_icmp = 0; 4359 u_int16_t sport = 0, dport = 0; 4360 u_int16_t bproto_sum = 0, bip_sum = 0; 4361 u_int8_t icmptype = 0, icmpcode = 0; 4362 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 4363 4364 PF_RULES_RASSERT(); 4365 4366 if (inp != NULL) { 4367 INP_LOCK_ASSERT(inp); 4368 pd->lookup.uid = inp->inp_cred->cr_uid; 4369 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 4370 pd->lookup.done = 1; 4371 } 4372 4373 switch (pd->proto) { 4374 case IPPROTO_TCP: 4375 sport = th->th_sport; 4376 dport = th->th_dport; 4377 hdrlen = sizeof(*th); 4378 break; 4379 case IPPROTO_UDP: 4380 sport = pd->hdr.udp.uh_sport; 4381 dport = pd->hdr.udp.uh_dport; 4382 hdrlen = sizeof(pd->hdr.udp); 4383 break; 4384 case IPPROTO_SCTP: 4385 sport = pd->hdr.sctp.src_port; 4386 dport = pd->hdr.sctp.dest_port; 4387 hdrlen = sizeof(pd->hdr.sctp); 4388 break; 4389 #ifdef INET 4390 case IPPROTO_ICMP: 4391 if (pd->af != AF_INET) 4392 break; 4393 sport = dport = pd->hdr.icmp.icmp_id; 4394 hdrlen = sizeof(pd->hdr.icmp); 4395 icmptype = pd->hdr.icmp.icmp_type; 4396 icmpcode = pd->hdr.icmp.icmp_code; 4397 4398 if (icmptype == ICMP_UNREACH || 4399 icmptype == ICMP_SOURCEQUENCH || 4400 icmptype == ICMP_REDIRECT || 4401 icmptype == ICMP_TIMXCEED || 4402 icmptype == ICMP_PARAMPROB) 4403 state_icmp++; 4404 break; 4405 #endif /* INET */ 4406 #ifdef INET6 4407 case IPPROTO_ICMPV6: 4408 if (af != AF_INET6) 4409 break; 4410 sport = dport = pd->hdr.icmp6.icmp6_id; 4411 hdrlen = sizeof(pd->hdr.icmp6); 4412 icmptype = pd->hdr.icmp6.icmp6_type; 4413 icmpcode = pd->hdr.icmp6.icmp6_code; 4414 4415 if (icmptype == ICMP6_DST_UNREACH || 4416 icmptype == ICMP6_PACKET_TOO_BIG || 4417 icmptype == ICMP6_TIME_EXCEEDED || 4418 icmptype == ICMP6_PARAM_PROB) 4419 state_icmp++; 4420 break; 4421 #endif /* INET6 */ 4422 default: 4423 sport = dport = hdrlen = 0; 4424 break; 4425 } 4426 4427 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4428 4429 /* check packet for BINAT/NAT/RDR */ 4430 if ((nr = pf_get_translation(pd, m, off, kif, &nsn, &sk, 4431 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 4432 KASSERT(sk != NULL, ("%s: null sk", __func__)); 4433 KASSERT(nk != NULL, ("%s: null nk", __func__)); 4434 4435 if (nr->log) { 4436 PFLOG_PACKET(kif, m, af, PFRES_MATCH, nr, a, 4437 ruleset, pd, 1); 4438 } 4439 4440 if (pd->ip_sum) 4441 bip_sum = *pd->ip_sum; 4442 4443 switch (pd->proto) { 4444 case IPPROTO_TCP: 4445 bproto_sum = th->th_sum; 4446 pd->proto_sum = &th->th_sum; 4447 4448 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4449 nk->port[pd->sidx] != sport) { 4450 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum, 4451 &th->th_sum, &nk->addr[pd->sidx], 4452 nk->port[pd->sidx], 0, af); 4453 pd->sport = &th->th_sport; 4454 sport = th->th_sport; 4455 } 4456 4457 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4458 nk->port[pd->didx] != dport) { 4459 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum, 4460 &th->th_sum, &nk->addr[pd->didx], 4461 nk->port[pd->didx], 0, af); 4462 dport = th->th_dport; 4463 pd->dport = &th->th_dport; 4464 } 4465 rewrite++; 4466 break; 4467 case IPPROTO_UDP: 4468 bproto_sum = pd->hdr.udp.uh_sum; 4469 pd->proto_sum = &pd->hdr.udp.uh_sum; 4470 4471 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4472 nk->port[pd->sidx] != sport) { 4473 pf_change_ap(m, saddr, &pd->hdr.udp.uh_sport, 4474 pd->ip_sum, &pd->hdr.udp.uh_sum, 4475 &nk->addr[pd->sidx], 4476 nk->port[pd->sidx], 1, af); 4477 sport = pd->hdr.udp.uh_sport; 4478 pd->sport = &pd->hdr.udp.uh_sport; 4479 } 4480 4481 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4482 nk->port[pd->didx] != dport) { 4483 pf_change_ap(m, daddr, &pd->hdr.udp.uh_dport, 4484 pd->ip_sum, &pd->hdr.udp.uh_sum, 4485 &nk->addr[pd->didx], 4486 nk->port[pd->didx], 1, af); 4487 dport = pd->hdr.udp.uh_dport; 4488 pd->dport = &pd->hdr.udp.uh_dport; 4489 } 4490 rewrite++; 4491 break; 4492 case IPPROTO_SCTP: { 4493 uint16_t checksum = 0; 4494 4495 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4496 nk->port[pd->sidx] != sport) { 4497 pf_change_ap(m, saddr, &pd->hdr.sctp.src_port, 4498 pd->ip_sum, &checksum, 4499 &nk->addr[pd->sidx], 4500 nk->port[pd->sidx], 1, af); 4501 } 4502 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4503 nk->port[pd->didx] != dport) { 4504 pf_change_ap(m, daddr, &pd->hdr.sctp.dest_port, 4505 pd->ip_sum, &checksum, 4506 &nk->addr[pd->didx], 4507 nk->port[pd->didx], 1, af); 4508 } 4509 break; 4510 } 4511 #ifdef INET 4512 case IPPROTO_ICMP: 4513 nk->port[0] = nk->port[1]; 4514 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 4515 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4516 nk->addr[pd->sidx].v4.s_addr, 0); 4517 4518 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 4519 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 4520 nk->addr[pd->didx].v4.s_addr, 0); 4521 4522 if (nk->port[1] != pd->hdr.icmp.icmp_id) { 4523 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( 4524 pd->hdr.icmp.icmp_cksum, sport, 4525 nk->port[1], 0); 4526 pd->hdr.icmp.icmp_id = nk->port[1]; 4527 pd->sport = &pd->hdr.icmp.icmp_id; 4528 } 4529 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); 4530 break; 4531 #endif /* INET */ 4532 #ifdef INET6 4533 case IPPROTO_ICMPV6: 4534 nk->port[0] = nk->port[1]; 4535 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 4536 pf_change_a6(saddr, &pd->hdr.icmp6.icmp6_cksum, 4537 &nk->addr[pd->sidx], 0); 4538 4539 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 4540 pf_change_a6(daddr, &pd->hdr.icmp6.icmp6_cksum, 4541 &nk->addr[pd->didx], 0); 4542 rewrite++; 4543 break; 4544 #endif /* INET */ 4545 default: 4546 switch (af) { 4547 #ifdef INET 4548 case AF_INET: 4549 if (PF_ANEQ(saddr, 4550 &nk->addr[pd->sidx], AF_INET)) 4551 pf_change_a(&saddr->v4.s_addr, 4552 pd->ip_sum, 4553 nk->addr[pd->sidx].v4.s_addr, 0); 4554 4555 if (PF_ANEQ(daddr, 4556 &nk->addr[pd->didx], AF_INET)) 4557 pf_change_a(&daddr->v4.s_addr, 4558 pd->ip_sum, 4559 nk->addr[pd->didx].v4.s_addr, 0); 4560 break; 4561 #endif /* INET */ 4562 #ifdef INET6 4563 case AF_INET6: 4564 if (PF_ANEQ(saddr, 4565 &nk->addr[pd->sidx], AF_INET6)) 4566 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 4567 4568 if (PF_ANEQ(daddr, 4569 &nk->addr[pd->didx], AF_INET6)) 4570 PF_ACPY(daddr, &nk->addr[pd->didx], af); 4571 break; 4572 #endif /* INET */ 4573 } 4574 break; 4575 } 4576 if (nr->natpass) 4577 r = NULL; 4578 pd->nat_rule = nr; 4579 } 4580 4581 SLIST_INIT(&match_rules); 4582 while (r != NULL) { 4583 pf_counter_u64_add(&r->evaluations, 1); 4584 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 4585 r = r->skip[PF_SKIP_IFP].ptr; 4586 else if (r->direction && r->direction != pd->dir) 4587 r = r->skip[PF_SKIP_DIR].ptr; 4588 else if (r->af && r->af != af) 4589 r = r->skip[PF_SKIP_AF].ptr; 4590 else if (r->proto && r->proto != pd->proto) 4591 r = r->skip[PF_SKIP_PROTO].ptr; 4592 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 4593 r->src.neg, kif, M_GETFIB(m))) 4594 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4595 /* tcp/udp only. port_op always 0 in other cases */ 4596 else if (r->src.port_op && !pf_match_port(r->src.port_op, 4597 r->src.port[0], r->src.port[1], sport)) 4598 r = r->skip[PF_SKIP_SRC_PORT].ptr; 4599 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 4600 r->dst.neg, NULL, M_GETFIB(m))) 4601 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4602 /* tcp/udp only. port_op always 0 in other cases */ 4603 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 4604 r->dst.port[0], r->dst.port[1], dport)) 4605 r = r->skip[PF_SKIP_DST_PORT].ptr; 4606 /* icmp only. type always 0 in other cases */ 4607 else if (r->type && r->type != icmptype + 1) 4608 r = TAILQ_NEXT(r, entries); 4609 /* icmp only. type always 0 in other cases */ 4610 else if (r->code && r->code != icmpcode + 1) 4611 r = TAILQ_NEXT(r, entries); 4612 else if (r->tos && !(r->tos == pd->tos)) 4613 r = TAILQ_NEXT(r, entries); 4614 else if (r->rule_flag & PFRULE_FRAGMENT) 4615 r = TAILQ_NEXT(r, entries); 4616 else if (pd->proto == IPPROTO_TCP && 4617 (r->flagset & th->th_flags) != r->flags) 4618 r = TAILQ_NEXT(r, entries); 4619 /* tcp/udp only. uid.op always 0 in other cases */ 4620 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 4621 pf_socket_lookup(pd, m), 1)) && 4622 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 4623 pd->lookup.uid)) 4624 r = TAILQ_NEXT(r, entries); 4625 /* tcp/udp only. gid.op always 0 in other cases */ 4626 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 4627 pf_socket_lookup(pd, m), 1)) && 4628 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 4629 pd->lookup.gid)) 4630 r = TAILQ_NEXT(r, entries); 4631 else if (r->prio && 4632 !pf_match_ieee8021q_pcp(r->prio, m)) 4633 r = TAILQ_NEXT(r, entries); 4634 else if (r->prob && 4635 r->prob <= arc4random()) 4636 r = TAILQ_NEXT(r, entries); 4637 else if (r->match_tag && !pf_match_tag(m, r, &tag, 4638 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 4639 r = TAILQ_NEXT(r, entries); 4640 else if (r->os_fingerprint != PF_OSFP_ANY && 4641 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 4642 pf_osfp_fingerprint(pd, m, off, th), 4643 r->os_fingerprint))) 4644 r = TAILQ_NEXT(r, entries); 4645 else { 4646 if (r->tag) 4647 tag = r->tag; 4648 if (r->anchor == NULL) { 4649 if (r->action == PF_MATCH) { 4650 ri = malloc(sizeof(struct pf_krule_item), M_PF_RULE_ITEM, M_NOWAIT | M_ZERO); 4651 if (ri == NULL) { 4652 REASON_SET(&reason, PFRES_MEMORY); 4653 goto cleanup; 4654 } 4655 ri->r = r; 4656 SLIST_INSERT_HEAD(&match_rules, ri, entry); 4657 pf_counter_u64_critical_enter(); 4658 pf_counter_u64_add_protected(&r->packets[pd->dir == PF_OUT], 1); 4659 pf_counter_u64_add_protected(&r->bytes[pd->dir == PF_OUT], pd->tot_len); 4660 pf_counter_u64_critical_exit(); 4661 pf_rule_to_actions(r, &pd->act); 4662 if (r->log) 4663 PFLOG_PACKET(kif, m, af, 4664 PFRES_MATCH, r, 4665 a, ruleset, pd, 1); 4666 } else { 4667 match = 1; 4668 *rm = r; 4669 *am = a; 4670 *rsm = ruleset; 4671 } 4672 if ((*rm)->quick) 4673 break; 4674 r = TAILQ_NEXT(r, entries); 4675 } else 4676 pf_step_into_anchor(anchor_stack, &asd, 4677 &ruleset, PF_RULESET_FILTER, &r, &a, 4678 &match); 4679 } 4680 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 4681 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 4682 break; 4683 } 4684 r = *rm; 4685 a = *am; 4686 ruleset = *rsm; 4687 4688 REASON_SET(&reason, PFRES_MATCH); 4689 4690 /* apply actions for last matching pass/block rule */ 4691 pf_rule_to_actions(r, &pd->act); 4692 4693 if (r->log) { 4694 if (rewrite) 4695 m_copyback(m, off, hdrlen, pd->hdr.any); 4696 PFLOG_PACKET(kif, m, af, reason, r, a, ruleset, pd, 1); 4697 } 4698 4699 if ((r->action == PF_DROP) && 4700 ((r->rule_flag & PFRULE_RETURNRST) || 4701 (r->rule_flag & PFRULE_RETURNICMP) || 4702 (r->rule_flag & PFRULE_RETURN))) { 4703 pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum, 4704 bip_sum, hdrlen, &reason, r->rtableid); 4705 } 4706 4707 if (r->action == PF_DROP) 4708 goto cleanup; 4709 4710 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 4711 REASON_SET(&reason, PFRES_MEMORY); 4712 goto cleanup; 4713 } 4714 if (pd->act.rtableid >= 0) 4715 M_SETFIB(m, pd->act.rtableid); 4716 4717 if (!state_icmp && (r->keep_state || nr != NULL || 4718 (pd->flags & PFDESC_TCP_NORM))) { 4719 int action; 4720 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 4721 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 4722 hdrlen, &match_rules); 4723 if (action != PF_PASS) { 4724 if (action == PF_DROP && 4725 (r->rule_flag & PFRULE_RETURN)) 4726 pf_return(r, nr, pd, sk, off, m, th, kif, 4727 bproto_sum, bip_sum, hdrlen, &reason, 4728 pd->act.rtableid); 4729 return (action); 4730 } 4731 } else { 4732 uma_zfree(V_pf_state_key_z, sk); 4733 uma_zfree(V_pf_state_key_z, nk); 4734 } 4735 4736 /* copy back packet headers if we performed NAT operations */ 4737 if (rewrite) 4738 m_copyback(m, off, hdrlen, pd->hdr.any); 4739 4740 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 4741 pd->dir == PF_OUT && 4742 V_pfsync_defer_ptr != NULL && V_pfsync_defer_ptr(*sm, m)) 4743 /* 4744 * We want the state created, but we dont 4745 * want to send this in case a partner 4746 * firewall has to know about it to allow 4747 * replies through it. 4748 */ 4749 return (PF_DEFER); 4750 4751 return (PF_PASS); 4752 4753 cleanup: 4754 while ((ri = SLIST_FIRST(&match_rules))) { 4755 SLIST_REMOVE_HEAD(&match_rules, entry); 4756 free(ri, M_PF_RULE_ITEM); 4757 } 4758 4759 uma_zfree(V_pf_state_key_z, sk); 4760 uma_zfree(V_pf_state_key_z, nk); 4761 return (PF_DROP); 4762 } 4763 4764 static int 4765 pf_create_state(struct pf_krule *r, struct pf_krule *nr, struct pf_krule *a, 4766 struct pf_pdesc *pd, struct pf_ksrc_node *nsn, struct pf_state_key *nk, 4767 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 4768 u_int16_t dport, int *rewrite, struct pfi_kkif *kif, struct pf_kstate **sm, 4769 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen, 4770 struct pf_krule_slist *match_rules) 4771 { 4772 struct pf_kstate *s = NULL; 4773 struct pf_ksrc_node *sn = NULL; 4774 struct tcphdr *th = &pd->hdr.tcp; 4775 u_int16_t mss = V_tcp_mssdflt; 4776 u_short reason, sn_reason; 4777 4778 /* check maximums */ 4779 if (r->max_states && 4780 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 4781 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 4782 REASON_SET(&reason, PFRES_MAXSTATES); 4783 goto csfailed; 4784 } 4785 /* src node for filter rule */ 4786 if ((r->rule_flag & PFRULE_SRCTRACK || 4787 r->rpool.opts & PF_POOL_STICKYADDR) && 4788 (sn_reason = pf_insert_src_node(&sn, r, pd->src, pd->af)) != 0) { 4789 REASON_SET(&reason, sn_reason); 4790 goto csfailed; 4791 } 4792 /* src node for translation rule */ 4793 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4794 (sn_reason = pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], 4795 pd->af)) != 0 ) { 4796 REASON_SET(&reason, sn_reason); 4797 goto csfailed; 4798 } 4799 s = pf_alloc_state(M_NOWAIT); 4800 if (s == NULL) { 4801 REASON_SET(&reason, PFRES_MEMORY); 4802 goto csfailed; 4803 } 4804 s->rule.ptr = r; 4805 s->nat_rule.ptr = nr; 4806 s->anchor.ptr = a; 4807 bcopy(match_rules, &s->match_rules, sizeof(s->match_rules)); 4808 memcpy(&s->act, &pd->act, sizeof(struct pf_rule_actions)); 4809 4810 STATE_INC_COUNTERS(s); 4811 if (r->allow_opts) 4812 s->state_flags |= PFSTATE_ALLOWOPTS; 4813 if (r->rule_flag & PFRULE_STATESLOPPY) 4814 s->state_flags |= PFSTATE_SLOPPY; 4815 if (pd->flags & PFDESC_TCP_NORM) /* Set by old-style scrub rules */ 4816 s->state_flags |= PFSTATE_SCRUB_TCP; 4817 4818 s->act.log = pd->act.log & PF_LOG_ALL; 4819 s->sync_state = PFSYNC_S_NONE; 4820 s->state_flags |= pd->act.flags; /* Only needed for pfsync and state export */ 4821 4822 if (nr != NULL) 4823 s->act.log |= nr->log & PF_LOG_ALL; 4824 switch (pd->proto) { 4825 case IPPROTO_TCP: 4826 s->src.seqlo = ntohl(th->th_seq); 4827 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 4828 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 4829 r->keep_state == PF_STATE_MODULATE) { 4830 /* Generate sequence number modulator */ 4831 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 4832 0) 4833 s->src.seqdiff = 1; 4834 pf_change_proto_a(m, &th->th_seq, &th->th_sum, 4835 htonl(s->src.seqlo + s->src.seqdiff), 0); 4836 *rewrite = 1; 4837 } else 4838 s->src.seqdiff = 0; 4839 if (th->th_flags & TH_SYN) { 4840 s->src.seqhi++; 4841 s->src.wscale = pf_get_wscale(m, off, 4842 th->th_off, pd->af); 4843 } 4844 s->src.max_win = MAX(ntohs(th->th_win), 1); 4845 if (s->src.wscale & PF_WSCALE_MASK) { 4846 /* Remove scale factor from initial window */ 4847 int win = s->src.max_win; 4848 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 4849 s->src.max_win = (win - 1) >> 4850 (s->src.wscale & PF_WSCALE_MASK); 4851 } 4852 if (th->th_flags & TH_FIN) 4853 s->src.seqhi++; 4854 s->dst.seqhi = 1; 4855 s->dst.max_win = 1; 4856 pf_set_protostate(s, PF_PEER_SRC, TCPS_SYN_SENT); 4857 pf_set_protostate(s, PF_PEER_DST, TCPS_CLOSED); 4858 s->timeout = PFTM_TCP_FIRST_PACKET; 4859 atomic_add_32(&V_pf_status.states_halfopen, 1); 4860 break; 4861 case IPPROTO_UDP: 4862 pf_set_protostate(s, PF_PEER_SRC, PFUDPS_SINGLE); 4863 pf_set_protostate(s, PF_PEER_DST, PFUDPS_NO_TRAFFIC); 4864 s->timeout = PFTM_UDP_FIRST_PACKET; 4865 break; 4866 case IPPROTO_SCTP: 4867 pf_set_protostate(s, PF_PEER_SRC, SCTP_COOKIE_WAIT); 4868 pf_set_protostate(s, PF_PEER_DST, SCTP_CLOSED); 4869 s->timeout = PFTM_TCP_FIRST_PACKET; 4870 break; 4871 case IPPROTO_ICMP: 4872 #ifdef INET6 4873 case IPPROTO_ICMPV6: 4874 #endif 4875 s->timeout = PFTM_ICMP_FIRST_PACKET; 4876 break; 4877 default: 4878 pf_set_protostate(s, PF_PEER_SRC, PFOTHERS_SINGLE); 4879 pf_set_protostate(s, PF_PEER_DST, PFOTHERS_NO_TRAFFIC); 4880 s->timeout = PFTM_OTHER_FIRST_PACKET; 4881 } 4882 4883 if (r->rt) { 4884 /* pf_map_addr increases the reason counters */ 4885 if ((reason = pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, 4886 &sn)) != 0) { 4887 pf_src_tree_remove_state(s); 4888 s->timeout = PFTM_UNLINKED; 4889 STATE_DEC_COUNTERS(s); 4890 pf_free_state(s); 4891 goto csfailed; 4892 } 4893 s->rt_kif = r->rpool.cur->kif; 4894 s->rt = r->rt; 4895 } 4896 4897 s->creation = time_uptime; 4898 s->expire = time_uptime; 4899 4900 if (sn != NULL) 4901 s->src_node = sn; 4902 if (nsn != NULL) { 4903 /* XXX We only modify one side for now. */ 4904 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 4905 s->nat_src_node = nsn; 4906 } 4907 if (pd->proto == IPPROTO_TCP) { 4908 if (s->state_flags & PFSTATE_SCRUB_TCP && 4909 pf_normalize_tcp_init(m, off, pd, th, &s->src, &s->dst)) { 4910 REASON_SET(&reason, PFRES_MEMORY); 4911 pf_src_tree_remove_state(s); 4912 s->timeout = PFTM_UNLINKED; 4913 STATE_DEC_COUNTERS(s); 4914 pf_free_state(s); 4915 return (PF_DROP); 4916 } 4917 if (s->state_flags & PFSTATE_SCRUB_TCP && s->src.scrub && 4918 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 4919 &s->src, &s->dst, rewrite)) { 4920 /* This really shouldn't happen!!! */ 4921 DPFPRINTF(PF_DEBUG_URGENT, 4922 ("pf_normalize_tcp_stateful failed on first " 4923 "pkt\n")); 4924 pf_src_tree_remove_state(s); 4925 s->timeout = PFTM_UNLINKED; 4926 STATE_DEC_COUNTERS(s); 4927 pf_free_state(s); 4928 return (PF_DROP); 4929 } 4930 } 4931 s->direction = pd->dir; 4932 4933 /* 4934 * sk/nk could already been setup by pf_get_translation(). 4935 */ 4936 if (nr == NULL) { 4937 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 4938 __func__, nr, sk, nk)); 4939 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 4940 if (sk == NULL) 4941 goto csfailed; 4942 nk = sk; 4943 } else 4944 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 4945 __func__, nr, sk, nk)); 4946 4947 /* Swap sk/nk for PF_OUT. */ 4948 if (pf_state_insert(BOUND_IFACE(r, kif), kif, 4949 (pd->dir == PF_IN) ? sk : nk, 4950 (pd->dir == PF_IN) ? nk : sk, s)) { 4951 REASON_SET(&reason, PFRES_STATEINS); 4952 pf_src_tree_remove_state(s); 4953 s->timeout = PFTM_UNLINKED; 4954 STATE_DEC_COUNTERS(s); 4955 pf_free_state(s); 4956 return (PF_DROP); 4957 } else 4958 *sm = s; 4959 4960 if (tag > 0) 4961 s->tag = tag; 4962 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 4963 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 4964 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_SRC); 4965 /* undo NAT changes, if they have taken place */ 4966 if (nr != NULL) { 4967 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 4968 if (pd->dir == PF_OUT) 4969 skt = s->key[PF_SK_STACK]; 4970 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 4971 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 4972 if (pd->sport) 4973 *pd->sport = skt->port[pd->sidx]; 4974 if (pd->dport) 4975 *pd->dport = skt->port[pd->didx]; 4976 if (pd->proto_sum) 4977 *pd->proto_sum = bproto_sum; 4978 if (pd->ip_sum) 4979 *pd->ip_sum = bip_sum; 4980 m_copyback(m, off, hdrlen, pd->hdr.any); 4981 } 4982 s->src.seqhi = htonl(arc4random()); 4983 /* Find mss option */ 4984 int rtid = M_GETFIB(m); 4985 mss = pf_get_mss(m, off, th->th_off, pd->af); 4986 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 4987 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 4988 s->src.mss = mss; 4989 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 4990 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 4991 TH_SYN|TH_ACK, 0, s->src.mss, 0, true, 0, 0, 4992 pd->act.rtableid); 4993 REASON_SET(&reason, PFRES_SYNPROXY); 4994 return (PF_SYNPROXY_DROP); 4995 } 4996 4997 return (PF_PASS); 4998 4999 csfailed: 5000 uma_zfree(V_pf_state_key_z, sk); 5001 uma_zfree(V_pf_state_key_z, nk); 5002 5003 if (sn != NULL) { 5004 PF_SRC_NODE_LOCK(sn); 5005 if (--sn->states == 0 && sn->expire == 0) { 5006 pf_unlink_src_node(sn); 5007 uma_zfree(V_pf_sources_z, sn); 5008 counter_u64_add( 5009 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 5010 } 5011 PF_SRC_NODE_UNLOCK(sn); 5012 } 5013 5014 if (nsn != sn && nsn != NULL) { 5015 PF_SRC_NODE_LOCK(nsn); 5016 if (--nsn->states == 0 && nsn->expire == 0) { 5017 pf_unlink_src_node(nsn); 5018 uma_zfree(V_pf_sources_z, nsn); 5019 counter_u64_add( 5020 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 5021 } 5022 PF_SRC_NODE_UNLOCK(nsn); 5023 } 5024 5025 return (PF_DROP); 5026 } 5027 5028 static int 5029 pf_test_fragment(struct pf_krule **rm, struct pfi_kkif *kif, 5030 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_krule **am, 5031 struct pf_kruleset **rsm) 5032 { 5033 struct pf_krule *r, *a = NULL; 5034 struct pf_kruleset *ruleset = NULL; 5035 struct pf_krule_slist match_rules; 5036 struct pf_krule_item *ri; 5037 sa_family_t af = pd->af; 5038 u_short reason; 5039 int tag = -1; 5040 int asd = 0; 5041 int match = 0; 5042 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 5043 5044 PF_RULES_RASSERT(); 5045 5046 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 5047 SLIST_INIT(&match_rules); 5048 while (r != NULL) { 5049 pf_counter_u64_add(&r->evaluations, 1); 5050 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 5051 r = r->skip[PF_SKIP_IFP].ptr; 5052 else if (r->direction && r->direction != pd->dir) 5053 r = r->skip[PF_SKIP_DIR].ptr; 5054 else if (r->af && r->af != af) 5055 r = r->skip[PF_SKIP_AF].ptr; 5056 else if (r->proto && r->proto != pd->proto) 5057 r = r->skip[PF_SKIP_PROTO].ptr; 5058 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 5059 r->src.neg, kif, M_GETFIB(m))) 5060 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 5061 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 5062 r->dst.neg, NULL, M_GETFIB(m))) 5063 r = r->skip[PF_SKIP_DST_ADDR].ptr; 5064 else if (r->tos && !(r->tos == pd->tos)) 5065 r = TAILQ_NEXT(r, entries); 5066 else if (r->os_fingerprint != PF_OSFP_ANY) 5067 r = TAILQ_NEXT(r, entries); 5068 else if (pd->proto == IPPROTO_UDP && 5069 (r->src.port_op || r->dst.port_op)) 5070 r = TAILQ_NEXT(r, entries); 5071 else if (pd->proto == IPPROTO_TCP && 5072 (r->src.port_op || r->dst.port_op || r->flagset)) 5073 r = TAILQ_NEXT(r, entries); 5074 else if ((pd->proto == IPPROTO_ICMP || 5075 pd->proto == IPPROTO_ICMPV6) && 5076 (r->type || r->code)) 5077 r = TAILQ_NEXT(r, entries); 5078 else if (r->prio && 5079 !pf_match_ieee8021q_pcp(r->prio, m)) 5080 r = TAILQ_NEXT(r, entries); 5081 else if (r->prob && r->prob <= 5082 (arc4random() % (UINT_MAX - 1) + 1)) 5083 r = TAILQ_NEXT(r, entries); 5084 else if (r->match_tag && !pf_match_tag(m, r, &tag, 5085 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 5086 r = TAILQ_NEXT(r, entries); 5087 else { 5088 if (r->anchor == NULL) { 5089 if (r->action == PF_MATCH) { 5090 ri = malloc(sizeof(struct pf_krule_item), M_PF_RULE_ITEM, M_NOWAIT | M_ZERO); 5091 if (ri == NULL) { 5092 REASON_SET(&reason, PFRES_MEMORY); 5093 goto cleanup; 5094 } 5095 ri->r = r; 5096 SLIST_INSERT_HEAD(&match_rules, ri, entry); 5097 pf_counter_u64_critical_enter(); 5098 pf_counter_u64_add_protected(&r->packets[pd->dir == PF_OUT], 1); 5099 pf_counter_u64_add_protected(&r->bytes[pd->dir == PF_OUT], pd->tot_len); 5100 pf_counter_u64_critical_exit(); 5101 pf_rule_to_actions(r, &pd->act); 5102 if (r->log) 5103 PFLOG_PACKET(kif, m, af, 5104 PFRES_MATCH, r, 5105 a, ruleset, pd, 1); 5106 } else { 5107 match = 1; 5108 *rm = r; 5109 *am = a; 5110 *rsm = ruleset; 5111 } 5112 if ((*rm)->quick) 5113 break; 5114 r = TAILQ_NEXT(r, entries); 5115 } else 5116 pf_step_into_anchor(anchor_stack, &asd, 5117 &ruleset, PF_RULESET_FILTER, &r, &a, 5118 &match); 5119 } 5120 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 5121 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 5122 break; 5123 } 5124 r = *rm; 5125 a = *am; 5126 ruleset = *rsm; 5127 5128 REASON_SET(&reason, PFRES_MATCH); 5129 5130 /* apply actions for last matching pass/block rule */ 5131 pf_rule_to_actions(r, &pd->act); 5132 5133 if (r->log) 5134 PFLOG_PACKET(kif, m, af, reason, r, a, ruleset, pd, 1); 5135 5136 if (r->action != PF_PASS) 5137 return (PF_DROP); 5138 5139 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 5140 REASON_SET(&reason, PFRES_MEMORY); 5141 goto cleanup; 5142 } 5143 5144 return (PF_PASS); 5145 5146 cleanup: 5147 while ((ri = SLIST_FIRST(&match_rules))) { 5148 SLIST_REMOVE_HEAD(&match_rules, entry); 5149 free(ri, M_PF_RULE_ITEM); 5150 } 5151 5152 return (PF_DROP); 5153 } 5154 5155 static int 5156 pf_tcp_track_full(struct pf_kstate **state, struct pfi_kkif *kif, 5157 struct mbuf *m, int off, struct pf_pdesc *pd, u_short *reason, 5158 int *copyback) 5159 { 5160 struct tcphdr *th = &pd->hdr.tcp; 5161 struct pf_state_peer *src, *dst; 5162 u_int16_t win = ntohs(th->th_win); 5163 u_int32_t ack, end, seq, orig_seq; 5164 u_int8_t sws, dws, psrc, pdst; 5165 int ackskew; 5166 5167 if (pd->dir == (*state)->direction) { 5168 src = &(*state)->src; 5169 dst = &(*state)->dst; 5170 psrc = PF_PEER_SRC; 5171 pdst = PF_PEER_DST; 5172 } else { 5173 src = &(*state)->dst; 5174 dst = &(*state)->src; 5175 psrc = PF_PEER_DST; 5176 pdst = PF_PEER_SRC; 5177 } 5178 5179 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 5180 sws = src->wscale & PF_WSCALE_MASK; 5181 dws = dst->wscale & PF_WSCALE_MASK; 5182 } else 5183 sws = dws = 0; 5184 5185 /* 5186 * Sequence tracking algorithm from Guido van Rooij's paper: 5187 * http://www.madison-gurkha.com/publications/tcp_filtering/ 5188 * tcp_filtering.ps 5189 */ 5190 5191 orig_seq = seq = ntohl(th->th_seq); 5192 if (src->seqlo == 0) { 5193 /* First packet from this end. Set its state */ 5194 5195 if (((*state)->state_flags & PFSTATE_SCRUB_TCP || dst->scrub) && 5196 src->scrub == NULL) { 5197 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 5198 REASON_SET(reason, PFRES_MEMORY); 5199 return (PF_DROP); 5200 } 5201 } 5202 5203 /* Deferred generation of sequence number modulator */ 5204 if (dst->seqdiff && !src->seqdiff) { 5205 /* use random iss for the TCP server */ 5206 while ((src->seqdiff = arc4random() - seq) == 0) 5207 ; 5208 ack = ntohl(th->th_ack) - dst->seqdiff; 5209 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 5210 src->seqdiff), 0); 5211 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 5212 *copyback = 1; 5213 } else { 5214 ack = ntohl(th->th_ack); 5215 } 5216 5217 end = seq + pd->p_len; 5218 if (th->th_flags & TH_SYN) { 5219 end++; 5220 if (dst->wscale & PF_WSCALE_FLAG) { 5221 src->wscale = pf_get_wscale(m, off, th->th_off, 5222 pd->af); 5223 if (src->wscale & PF_WSCALE_FLAG) { 5224 /* Remove scale factor from initial 5225 * window */ 5226 sws = src->wscale & PF_WSCALE_MASK; 5227 win = ((u_int32_t)win + (1 << sws) - 1) 5228 >> sws; 5229 dws = dst->wscale & PF_WSCALE_MASK; 5230 } else { 5231 /* fixup other window */ 5232 dst->max_win <<= dst->wscale & 5233 PF_WSCALE_MASK; 5234 /* in case of a retrans SYN|ACK */ 5235 dst->wscale = 0; 5236 } 5237 } 5238 } 5239 if (th->th_flags & TH_FIN) 5240 end++; 5241 5242 src->seqlo = seq; 5243 if (src->state < TCPS_SYN_SENT) 5244 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5245 5246 /* 5247 * May need to slide the window (seqhi may have been set by 5248 * the crappy stack check or if we picked up the connection 5249 * after establishment) 5250 */ 5251 if (src->seqhi == 1 || 5252 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 5253 src->seqhi = end + MAX(1, dst->max_win << dws); 5254 if (win > src->max_win) 5255 src->max_win = win; 5256 5257 } else { 5258 ack = ntohl(th->th_ack) - dst->seqdiff; 5259 if (src->seqdiff) { 5260 /* Modulate sequence numbers */ 5261 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 5262 src->seqdiff), 0); 5263 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 5264 *copyback = 1; 5265 } 5266 end = seq + pd->p_len; 5267 if (th->th_flags & TH_SYN) 5268 end++; 5269 if (th->th_flags & TH_FIN) 5270 end++; 5271 } 5272 5273 if ((th->th_flags & TH_ACK) == 0) { 5274 /* Let it pass through the ack skew check */ 5275 ack = dst->seqlo; 5276 } else if ((ack == 0 && 5277 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 5278 /* broken tcp stacks do not set ack */ 5279 (dst->state < TCPS_SYN_SENT)) { 5280 /* 5281 * Many stacks (ours included) will set the ACK number in an 5282 * FIN|ACK if the SYN times out -- no sequence to ACK. 5283 */ 5284 ack = dst->seqlo; 5285 } 5286 5287 if (seq == end) { 5288 /* Ease sequencing restrictions on no data packets */ 5289 seq = src->seqlo; 5290 end = seq; 5291 } 5292 5293 ackskew = dst->seqlo - ack; 5294 5295 /* 5296 * Need to demodulate the sequence numbers in any TCP SACK options 5297 * (Selective ACK). We could optionally validate the SACK values 5298 * against the current ACK window, either forwards or backwards, but 5299 * I'm not confident that SACK has been implemented properly 5300 * everywhere. It wouldn't surprise me if several stacks accidentally 5301 * SACK too far backwards of previously ACKed data. There really aren't 5302 * any security implications of bad SACKing unless the target stack 5303 * doesn't validate the option length correctly. Someone trying to 5304 * spoof into a TCP connection won't bother blindly sending SACK 5305 * options anyway. 5306 */ 5307 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 5308 if (pf_modulate_sack(m, off, pd, th, dst)) 5309 *copyback = 1; 5310 } 5311 5312 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 5313 if (SEQ_GEQ(src->seqhi, end) && 5314 /* Last octet inside other's window space */ 5315 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 5316 /* Retrans: not more than one window back */ 5317 (ackskew >= -MAXACKWINDOW) && 5318 /* Acking not more than one reassembled fragment backwards */ 5319 (ackskew <= (MAXACKWINDOW << sws)) && 5320 /* Acking not more than one window forward */ 5321 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 5322 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 5323 (pd->flags & PFDESC_IP_REAS) == 0)) { 5324 /* Require an exact/+1 sequence match on resets when possible */ 5325 5326 if (dst->scrub || src->scrub) { 5327 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5328 *state, src, dst, copyback)) 5329 return (PF_DROP); 5330 } 5331 5332 /* update max window */ 5333 if (src->max_win < win) 5334 src->max_win = win; 5335 /* synchronize sequencing */ 5336 if (SEQ_GT(end, src->seqlo)) 5337 src->seqlo = end; 5338 /* slide the window of what the other end can send */ 5339 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5340 dst->seqhi = ack + MAX((win << sws), 1); 5341 5342 /* update states */ 5343 if (th->th_flags & TH_SYN) 5344 if (src->state < TCPS_SYN_SENT) 5345 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5346 if (th->th_flags & TH_FIN) 5347 if (src->state < TCPS_CLOSING) 5348 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5349 if (th->th_flags & TH_ACK) { 5350 if (dst->state == TCPS_SYN_SENT) { 5351 pf_set_protostate(*state, pdst, 5352 TCPS_ESTABLISHED); 5353 if (src->state == TCPS_ESTABLISHED && 5354 (*state)->src_node != NULL && 5355 pf_src_connlimit(state)) { 5356 REASON_SET(reason, PFRES_SRCLIMIT); 5357 return (PF_DROP); 5358 } 5359 } else if (dst->state == TCPS_CLOSING) 5360 pf_set_protostate(*state, pdst, 5361 TCPS_FIN_WAIT_2); 5362 } 5363 if (th->th_flags & TH_RST) 5364 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5365 5366 /* update expire time */ 5367 (*state)->expire = time_uptime; 5368 if (src->state >= TCPS_FIN_WAIT_2 && 5369 dst->state >= TCPS_FIN_WAIT_2) 5370 (*state)->timeout = PFTM_TCP_CLOSED; 5371 else if (src->state >= TCPS_CLOSING && 5372 dst->state >= TCPS_CLOSING) 5373 (*state)->timeout = PFTM_TCP_FIN_WAIT; 5374 else if (src->state < TCPS_ESTABLISHED || 5375 dst->state < TCPS_ESTABLISHED) 5376 (*state)->timeout = PFTM_TCP_OPENING; 5377 else if (src->state >= TCPS_CLOSING || 5378 dst->state >= TCPS_CLOSING) 5379 (*state)->timeout = PFTM_TCP_CLOSING; 5380 else 5381 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5382 5383 /* Fall through to PASS packet */ 5384 5385 } else if ((dst->state < TCPS_SYN_SENT || 5386 dst->state >= TCPS_FIN_WAIT_2 || 5387 src->state >= TCPS_FIN_WAIT_2) && 5388 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 5389 /* Within a window forward of the originating packet */ 5390 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 5391 /* Within a window backward of the originating packet */ 5392 5393 /* 5394 * This currently handles three situations: 5395 * 1) Stupid stacks will shotgun SYNs before their peer 5396 * replies. 5397 * 2) When PF catches an already established stream (the 5398 * firewall rebooted, the state table was flushed, routes 5399 * changed...) 5400 * 3) Packets get funky immediately after the connection 5401 * closes (this should catch Solaris spurious ACK|FINs 5402 * that web servers like to spew after a close) 5403 * 5404 * This must be a little more careful than the above code 5405 * since packet floods will also be caught here. We don't 5406 * update the TTL here to mitigate the damage of a packet 5407 * flood and so the same code can handle awkward establishment 5408 * and a loosened connection close. 5409 * In the establishment case, a correct peer response will 5410 * validate the connection, go through the normal state code 5411 * and keep updating the state TTL. 5412 */ 5413 5414 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5415 printf("pf: loose state match: "); 5416 pf_print_state(*state); 5417 pf_print_flags(th->th_flags); 5418 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5419 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 5420 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 5421 (unsigned long long)(*state)->packets[1], 5422 pd->dir == PF_IN ? "in" : "out", 5423 pd->dir == (*state)->direction ? "fwd" : "rev"); 5424 } 5425 5426 if (dst->scrub || src->scrub) { 5427 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5428 *state, src, dst, copyback)) 5429 return (PF_DROP); 5430 } 5431 5432 /* update max window */ 5433 if (src->max_win < win) 5434 src->max_win = win; 5435 /* synchronize sequencing */ 5436 if (SEQ_GT(end, src->seqlo)) 5437 src->seqlo = end; 5438 /* slide the window of what the other end can send */ 5439 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5440 dst->seqhi = ack + MAX((win << sws), 1); 5441 5442 /* 5443 * Cannot set dst->seqhi here since this could be a shotgunned 5444 * SYN and not an already established connection. 5445 */ 5446 5447 if (th->th_flags & TH_FIN) 5448 if (src->state < TCPS_CLOSING) 5449 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5450 if (th->th_flags & TH_RST) 5451 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5452 5453 /* Fall through to PASS packet */ 5454 5455 } else { 5456 if ((*state)->dst.state == TCPS_SYN_SENT && 5457 (*state)->src.state == TCPS_SYN_SENT) { 5458 /* Send RST for state mismatches during handshake */ 5459 if (!(th->th_flags & TH_RST)) 5460 pf_send_tcp((*state)->rule.ptr, pd->af, 5461 pd->dst, pd->src, th->th_dport, 5462 th->th_sport, ntohl(th->th_ack), 0, 5463 TH_RST, 0, 0, 5464 (*state)->rule.ptr->return_ttl, true, 0, 0, 5465 (*state)->act.rtableid); 5466 src->seqlo = 0; 5467 src->seqhi = 1; 5468 src->max_win = 1; 5469 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 5470 printf("pf: BAD state: "); 5471 pf_print_state(*state); 5472 pf_print_flags(th->th_flags); 5473 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5474 "pkts=%llu:%llu dir=%s,%s\n", 5475 seq, orig_seq, ack, pd->p_len, ackskew, 5476 (unsigned long long)(*state)->packets[0], 5477 (unsigned long long)(*state)->packets[1], 5478 pd->dir == PF_IN ? "in" : "out", 5479 pd->dir == (*state)->direction ? "fwd" : "rev"); 5480 printf("pf: State failure on: %c %c %c %c | %c %c\n", 5481 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 5482 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 5483 ' ': '2', 5484 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 5485 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 5486 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 5487 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 5488 } 5489 REASON_SET(reason, PFRES_BADSTATE); 5490 return (PF_DROP); 5491 } 5492 5493 return (PF_PASS); 5494 } 5495 5496 static int 5497 pf_tcp_track_sloppy(struct pf_kstate **state, struct pf_pdesc *pd, u_short *reason) 5498 { 5499 struct tcphdr *th = &pd->hdr.tcp; 5500 struct pf_state_peer *src, *dst; 5501 u_int8_t psrc, pdst; 5502 5503 if (pd->dir == (*state)->direction) { 5504 src = &(*state)->src; 5505 dst = &(*state)->dst; 5506 psrc = PF_PEER_SRC; 5507 pdst = PF_PEER_DST; 5508 } else { 5509 src = &(*state)->dst; 5510 dst = &(*state)->src; 5511 psrc = PF_PEER_DST; 5512 pdst = PF_PEER_SRC; 5513 } 5514 5515 if (th->th_flags & TH_SYN) 5516 if (src->state < TCPS_SYN_SENT) 5517 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5518 if (th->th_flags & TH_FIN) 5519 if (src->state < TCPS_CLOSING) 5520 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5521 if (th->th_flags & TH_ACK) { 5522 if (dst->state == TCPS_SYN_SENT) { 5523 pf_set_protostate(*state, pdst, TCPS_ESTABLISHED); 5524 if (src->state == TCPS_ESTABLISHED && 5525 (*state)->src_node != NULL && 5526 pf_src_connlimit(state)) { 5527 REASON_SET(reason, PFRES_SRCLIMIT); 5528 return (PF_DROP); 5529 } 5530 } else if (dst->state == TCPS_CLOSING) { 5531 pf_set_protostate(*state, pdst, TCPS_FIN_WAIT_2); 5532 } else if (src->state == TCPS_SYN_SENT && 5533 dst->state < TCPS_SYN_SENT) { 5534 /* 5535 * Handle a special sloppy case where we only see one 5536 * half of the connection. If there is a ACK after 5537 * the initial SYN without ever seeing a packet from 5538 * the destination, set the connection to established. 5539 */ 5540 pf_set_protostate(*state, PF_PEER_BOTH, 5541 TCPS_ESTABLISHED); 5542 dst->state = src->state = TCPS_ESTABLISHED; 5543 if ((*state)->src_node != NULL && 5544 pf_src_connlimit(state)) { 5545 REASON_SET(reason, PFRES_SRCLIMIT); 5546 return (PF_DROP); 5547 } 5548 } else if (src->state == TCPS_CLOSING && 5549 dst->state == TCPS_ESTABLISHED && 5550 dst->seqlo == 0) { 5551 /* 5552 * Handle the closing of half connections where we 5553 * don't see the full bidirectional FIN/ACK+ACK 5554 * handshake. 5555 */ 5556 pf_set_protostate(*state, pdst, TCPS_CLOSING); 5557 } 5558 } 5559 if (th->th_flags & TH_RST) 5560 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5561 5562 /* update expire time */ 5563 (*state)->expire = time_uptime; 5564 if (src->state >= TCPS_FIN_WAIT_2 && 5565 dst->state >= TCPS_FIN_WAIT_2) 5566 (*state)->timeout = PFTM_TCP_CLOSED; 5567 else if (src->state >= TCPS_CLOSING && 5568 dst->state >= TCPS_CLOSING) 5569 (*state)->timeout = PFTM_TCP_FIN_WAIT; 5570 else if (src->state < TCPS_ESTABLISHED || 5571 dst->state < TCPS_ESTABLISHED) 5572 (*state)->timeout = PFTM_TCP_OPENING; 5573 else if (src->state >= TCPS_CLOSING || 5574 dst->state >= TCPS_CLOSING) 5575 (*state)->timeout = PFTM_TCP_CLOSING; 5576 else 5577 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5578 5579 return (PF_PASS); 5580 } 5581 5582 static int 5583 pf_synproxy(struct pf_pdesc *pd, struct pf_kstate **state, u_short *reason) 5584 { 5585 struct pf_state_key *sk = (*state)->key[pd->didx]; 5586 struct tcphdr *th = &pd->hdr.tcp; 5587 5588 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 5589 if (pd->dir != (*state)->direction) { 5590 REASON_SET(reason, PFRES_SYNPROXY); 5591 return (PF_SYNPROXY_DROP); 5592 } 5593 if (th->th_flags & TH_SYN) { 5594 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 5595 REASON_SET(reason, PFRES_SYNPROXY); 5596 return (PF_DROP); 5597 } 5598 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5599 pd->src, th->th_dport, th->th_sport, 5600 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 5601 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, true, 0, 0, 5602 (*state)->act.rtableid); 5603 REASON_SET(reason, PFRES_SYNPROXY); 5604 return (PF_SYNPROXY_DROP); 5605 } else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK || 5606 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5607 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5608 REASON_SET(reason, PFRES_SYNPROXY); 5609 return (PF_DROP); 5610 } else if ((*state)->src_node != NULL && 5611 pf_src_connlimit(state)) { 5612 REASON_SET(reason, PFRES_SRCLIMIT); 5613 return (PF_DROP); 5614 } else 5615 pf_set_protostate(*state, PF_PEER_SRC, 5616 PF_TCPS_PROXY_DST); 5617 } 5618 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 5619 if (pd->dir == (*state)->direction) { 5620 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 5621 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5622 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5623 REASON_SET(reason, PFRES_SYNPROXY); 5624 return (PF_DROP); 5625 } 5626 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 5627 if ((*state)->dst.seqhi == 1) 5628 (*state)->dst.seqhi = htonl(arc4random()); 5629 pf_send_tcp((*state)->rule.ptr, pd->af, 5630 &sk->addr[pd->sidx], &sk->addr[pd->didx], 5631 sk->port[pd->sidx], sk->port[pd->didx], 5632 (*state)->dst.seqhi, 0, TH_SYN, 0, 5633 (*state)->src.mss, 0, false, (*state)->tag, 0, 5634 (*state)->act.rtableid); 5635 REASON_SET(reason, PFRES_SYNPROXY); 5636 return (PF_SYNPROXY_DROP); 5637 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 5638 (TH_SYN|TH_ACK)) || 5639 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 5640 REASON_SET(reason, PFRES_SYNPROXY); 5641 return (PF_DROP); 5642 } else { 5643 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 5644 (*state)->dst.seqlo = ntohl(th->th_seq); 5645 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5646 pd->src, th->th_dport, th->th_sport, 5647 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 5648 TH_ACK, (*state)->src.max_win, 0, 0, false, 5649 (*state)->tag, 0, (*state)->act.rtableid); 5650 pf_send_tcp((*state)->rule.ptr, pd->af, 5651 &sk->addr[pd->sidx], &sk->addr[pd->didx], 5652 sk->port[pd->sidx], sk->port[pd->didx], 5653 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 5654 TH_ACK, (*state)->dst.max_win, 0, 0, true, 0, 0, 5655 (*state)->act.rtableid); 5656 (*state)->src.seqdiff = (*state)->dst.seqhi - 5657 (*state)->src.seqlo; 5658 (*state)->dst.seqdiff = (*state)->src.seqhi - 5659 (*state)->dst.seqlo; 5660 (*state)->src.seqhi = (*state)->src.seqlo + 5661 (*state)->dst.max_win; 5662 (*state)->dst.seqhi = (*state)->dst.seqlo + 5663 (*state)->src.max_win; 5664 (*state)->src.wscale = (*state)->dst.wscale = 0; 5665 pf_set_protostate(*state, PF_PEER_BOTH, 5666 TCPS_ESTABLISHED); 5667 REASON_SET(reason, PFRES_SYNPROXY); 5668 return (PF_SYNPROXY_DROP); 5669 } 5670 } 5671 5672 return (PF_PASS); 5673 } 5674 5675 static int 5676 pf_test_state_tcp(struct pf_kstate **state, struct pfi_kkif *kif, 5677 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 5678 u_short *reason) 5679 { 5680 struct pf_state_key_cmp key; 5681 struct tcphdr *th = &pd->hdr.tcp; 5682 int copyback = 0; 5683 int action; 5684 struct pf_state_peer *src, *dst; 5685 5686 bzero(&key, sizeof(key)); 5687 key.af = pd->af; 5688 key.proto = IPPROTO_TCP; 5689 if (pd->dir == PF_IN) { /* wire side, straight */ 5690 PF_ACPY(&key.addr[0], pd->src, key.af); 5691 PF_ACPY(&key.addr[1], pd->dst, key.af); 5692 key.port[0] = th->th_sport; 5693 key.port[1] = th->th_dport; 5694 } else { /* stack side, reverse */ 5695 PF_ACPY(&key.addr[1], pd->src, key.af); 5696 PF_ACPY(&key.addr[0], pd->dst, key.af); 5697 key.port[1] = th->th_sport; 5698 key.port[0] = th->th_dport; 5699 } 5700 5701 STATE_LOOKUP(kif, &key, *state, pd); 5702 5703 if (pd->dir == (*state)->direction) { 5704 src = &(*state)->src; 5705 dst = &(*state)->dst; 5706 } else { 5707 src = &(*state)->dst; 5708 dst = &(*state)->src; 5709 } 5710 5711 if ((action = pf_synproxy(pd, state, reason)) != PF_PASS) 5712 return (action); 5713 5714 if (dst->state >= TCPS_FIN_WAIT_2 && 5715 src->state >= TCPS_FIN_WAIT_2 && 5716 (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) || 5717 ((th->th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_ACK && 5718 pf_syncookie_check(pd) && pd->dir == PF_IN))) { 5719 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5720 printf("pf: state reuse "); 5721 pf_print_state(*state); 5722 pf_print_flags(th->th_flags); 5723 printf("\n"); 5724 } 5725 /* XXX make sure it's the same direction ?? */ 5726 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED); 5727 pf_unlink_state(*state); 5728 *state = NULL; 5729 return (PF_DROP); 5730 } 5731 5732 if ((*state)->state_flags & PFSTATE_SLOPPY) { 5733 if (pf_tcp_track_sloppy(state, pd, reason) == PF_DROP) 5734 return (PF_DROP); 5735 } else { 5736 if (pf_tcp_track_full(state, kif, m, off, pd, reason, 5737 ©back) == PF_DROP) 5738 return (PF_DROP); 5739 } 5740 5741 /* translate source/destination address, if necessary */ 5742 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5743 struct pf_state_key *nk = (*state)->key[pd->didx]; 5744 5745 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5746 nk->port[pd->sidx] != th->th_sport) 5747 pf_change_ap(m, pd->src, &th->th_sport, 5748 pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], 5749 nk->port[pd->sidx], 0, pd->af); 5750 5751 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5752 nk->port[pd->didx] != th->th_dport) 5753 pf_change_ap(m, pd->dst, &th->th_dport, 5754 pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], 5755 nk->port[pd->didx], 0, pd->af); 5756 copyback = 1; 5757 } 5758 5759 /* Copyback sequence modulation or stateful scrub changes if needed */ 5760 if (copyback) 5761 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5762 5763 return (PF_PASS); 5764 } 5765 5766 static int 5767 pf_test_state_udp(struct pf_kstate **state, struct pfi_kkif *kif, 5768 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5769 { 5770 struct pf_state_peer *src, *dst; 5771 struct pf_state_key_cmp key; 5772 struct udphdr *uh = &pd->hdr.udp; 5773 uint8_t psrc, pdst; 5774 5775 bzero(&key, sizeof(key)); 5776 key.af = pd->af; 5777 key.proto = IPPROTO_UDP; 5778 if (pd->dir == PF_IN) { /* wire side, straight */ 5779 PF_ACPY(&key.addr[0], pd->src, key.af); 5780 PF_ACPY(&key.addr[1], pd->dst, key.af); 5781 key.port[0] = uh->uh_sport; 5782 key.port[1] = uh->uh_dport; 5783 } else { /* stack side, reverse */ 5784 PF_ACPY(&key.addr[1], pd->src, key.af); 5785 PF_ACPY(&key.addr[0], pd->dst, key.af); 5786 key.port[1] = uh->uh_sport; 5787 key.port[0] = uh->uh_dport; 5788 } 5789 5790 STATE_LOOKUP(kif, &key, *state, pd); 5791 5792 if (pd->dir == (*state)->direction) { 5793 src = &(*state)->src; 5794 dst = &(*state)->dst; 5795 psrc = PF_PEER_SRC; 5796 pdst = PF_PEER_DST; 5797 } else { 5798 src = &(*state)->dst; 5799 dst = &(*state)->src; 5800 psrc = PF_PEER_DST; 5801 pdst = PF_PEER_SRC; 5802 } 5803 5804 /* update states */ 5805 if (src->state < PFUDPS_SINGLE) 5806 pf_set_protostate(*state, psrc, PFUDPS_SINGLE); 5807 if (dst->state == PFUDPS_SINGLE) 5808 pf_set_protostate(*state, pdst, PFUDPS_MULTIPLE); 5809 5810 /* update expire time */ 5811 (*state)->expire = time_uptime; 5812 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5813 (*state)->timeout = PFTM_UDP_MULTIPLE; 5814 else 5815 (*state)->timeout = PFTM_UDP_SINGLE; 5816 5817 /* translate source/destination address, if necessary */ 5818 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5819 struct pf_state_key *nk = (*state)->key[pd->didx]; 5820 5821 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5822 nk->port[pd->sidx] != uh->uh_sport) 5823 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 5824 &uh->uh_sum, &nk->addr[pd->sidx], 5825 nk->port[pd->sidx], 1, pd->af); 5826 5827 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5828 nk->port[pd->didx] != uh->uh_dport) 5829 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 5830 &uh->uh_sum, &nk->addr[pd->didx], 5831 nk->port[pd->didx], 1, pd->af); 5832 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5833 } 5834 5835 return (PF_PASS); 5836 } 5837 5838 static int 5839 pf_test_state_sctp(struct pf_kstate **state, struct pfi_kkif *kif, 5840 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5841 { 5842 struct pf_state_key_cmp key; 5843 struct pf_state_peer *src; //, *dst; 5844 struct sctphdr *sh = &pd->hdr.sctp; 5845 u_int8_t psrc; //, pdst; 5846 5847 bzero(&key, sizeof(key)); 5848 key.af = pd->af; 5849 key.proto = IPPROTO_SCTP; 5850 if (pd->dir == PF_IN) { /* wire side, straight */ 5851 PF_ACPY(&key.addr[0], pd->src, key.af); 5852 PF_ACPY(&key.addr[1], pd->dst, key.af); 5853 key.port[0] = sh->src_port; 5854 key.port[1] = sh->dest_port; 5855 } else { /* stack side, reverse */ 5856 PF_ACPY(&key.addr[1], pd->src, key.af); 5857 PF_ACPY(&key.addr[0], pd->dst, key.af); 5858 key.port[1] = sh->src_port; 5859 key.port[0] = sh->dest_port; 5860 } 5861 5862 STATE_LOOKUP(kif, &key, *state, pd); 5863 5864 if (pd->dir == (*state)->direction) { 5865 src = &(*state)->src; 5866 psrc = PF_PEER_SRC; 5867 } else { 5868 src = &(*state)->dst; 5869 psrc = PF_PEER_DST; 5870 } 5871 5872 /* Track state. */ 5873 if (pd->sctp_flags & PFDESC_SCTP_INIT) { 5874 if (src->state < SCTP_COOKIE_WAIT) { 5875 pf_set_protostate(*state, psrc, SCTP_COOKIE_WAIT); 5876 (*state)->timeout = PFTM_TCP_OPENING; 5877 } 5878 } 5879 if (pd->sctp_flags & PFDESC_SCTP_COOKIE) { 5880 if (src->state < SCTP_ESTABLISHED) { 5881 pf_set_protostate(*state, psrc, SCTP_ESTABLISHED); 5882 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5883 } 5884 } 5885 if (pd->sctp_flags & (PFDESC_SCTP_SHUTDOWN | PFDESC_SCTP_ABORT | 5886 PFDESC_SCTP_SHUTDOWN_COMPLETE)) { 5887 if (src->state < SCTP_SHUTDOWN_PENDING) { 5888 pf_set_protostate(*state, psrc, SCTP_SHUTDOWN_PENDING); 5889 (*state)->timeout = PFTM_TCP_CLOSING; 5890 } 5891 } 5892 5893 (*state)->expire = time_uptime; 5894 5895 /* translate source/destination address, if necessary */ 5896 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5897 uint16_t checksum = 0; 5898 struct pf_state_key *nk = (*state)->key[pd->didx]; 5899 5900 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5901 nk->port[pd->sidx] != pd->hdr.sctp.src_port) { 5902 pf_change_ap(m, pd->src, &pd->hdr.sctp.src_port, 5903 pd->ip_sum, &checksum, &nk->addr[pd->sidx], 5904 nk->port[pd->sidx], 1, pd->af); 5905 } 5906 5907 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5908 nk->port[pd->didx] != pd->hdr.sctp.dest_port) { 5909 pf_change_ap(m, pd->dst, &pd->hdr.sctp.dest_port, 5910 pd->ip_sum, &checksum, &nk->addr[pd->didx], 5911 nk->port[pd->didx], 1, pd->af); 5912 } 5913 } 5914 5915 return (PF_PASS); 5916 } 5917 5918 static int 5919 pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, 5920 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5921 { 5922 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 5923 u_int16_t icmpid = 0, *icmpsum; 5924 u_int8_t icmptype, icmpcode; 5925 int state_icmp = 0; 5926 struct pf_state_key_cmp key; 5927 5928 bzero(&key, sizeof(key)); 5929 switch (pd->proto) { 5930 #ifdef INET 5931 case IPPROTO_ICMP: 5932 icmptype = pd->hdr.icmp.icmp_type; 5933 icmpcode = pd->hdr.icmp.icmp_code; 5934 icmpid = pd->hdr.icmp.icmp_id; 5935 icmpsum = &pd->hdr.icmp.icmp_cksum; 5936 5937 if (icmptype == ICMP_UNREACH || 5938 icmptype == ICMP_SOURCEQUENCH || 5939 icmptype == ICMP_REDIRECT || 5940 icmptype == ICMP_TIMXCEED || 5941 icmptype == ICMP_PARAMPROB) 5942 state_icmp++; 5943 break; 5944 #endif /* INET */ 5945 #ifdef INET6 5946 case IPPROTO_ICMPV6: 5947 icmptype = pd->hdr.icmp6.icmp6_type; 5948 icmpcode = pd->hdr.icmp6.icmp6_code; 5949 icmpid = pd->hdr.icmp6.icmp6_id; 5950 icmpsum = &pd->hdr.icmp6.icmp6_cksum; 5951 5952 if (icmptype == ICMP6_DST_UNREACH || 5953 icmptype == ICMP6_PACKET_TOO_BIG || 5954 icmptype == ICMP6_TIME_EXCEEDED || 5955 icmptype == ICMP6_PARAM_PROB) 5956 state_icmp++; 5957 break; 5958 #endif /* INET6 */ 5959 } 5960 5961 if (!state_icmp) { 5962 /* 5963 * ICMP query/reply message not related to a TCP/UDP packet. 5964 * Search for an ICMP state. 5965 */ 5966 key.af = pd->af; 5967 key.proto = pd->proto; 5968 key.port[0] = key.port[1] = icmpid; 5969 if (pd->dir == PF_IN) { /* wire side, straight */ 5970 PF_ACPY(&key.addr[0], pd->src, key.af); 5971 PF_ACPY(&key.addr[1], pd->dst, key.af); 5972 } else { /* stack side, reverse */ 5973 PF_ACPY(&key.addr[1], pd->src, key.af); 5974 PF_ACPY(&key.addr[0], pd->dst, key.af); 5975 } 5976 5977 STATE_LOOKUP(kif, &key, *state, pd); 5978 5979 (*state)->expire = time_uptime; 5980 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 5981 5982 /* translate source/destination address, if necessary */ 5983 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5984 struct pf_state_key *nk = (*state)->key[pd->didx]; 5985 5986 switch (pd->af) { 5987 #ifdef INET 5988 case AF_INET: 5989 if (PF_ANEQ(pd->src, 5990 &nk->addr[pd->sidx], AF_INET)) 5991 pf_change_a(&saddr->v4.s_addr, 5992 pd->ip_sum, 5993 nk->addr[pd->sidx].v4.s_addr, 0); 5994 5995 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 5996 AF_INET)) 5997 pf_change_a(&daddr->v4.s_addr, 5998 pd->ip_sum, 5999 nk->addr[pd->didx].v4.s_addr, 0); 6000 6001 if (nk->port[0] != 6002 pd->hdr.icmp.icmp_id) { 6003 pd->hdr.icmp.icmp_cksum = 6004 pf_cksum_fixup( 6005 pd->hdr.icmp.icmp_cksum, icmpid, 6006 nk->port[pd->sidx], 0); 6007 pd->hdr.icmp.icmp_id = 6008 nk->port[pd->sidx]; 6009 } 6010 6011 m_copyback(m, off, ICMP_MINLEN, 6012 (caddr_t )&pd->hdr.icmp); 6013 break; 6014 #endif /* INET */ 6015 #ifdef INET6 6016 case AF_INET6: 6017 if (PF_ANEQ(pd->src, 6018 &nk->addr[pd->sidx], AF_INET6)) 6019 pf_change_a6(saddr, 6020 &pd->hdr.icmp6.icmp6_cksum, 6021 &nk->addr[pd->sidx], 0); 6022 6023 if (PF_ANEQ(pd->dst, 6024 &nk->addr[pd->didx], AF_INET6)) 6025 pf_change_a6(daddr, 6026 &pd->hdr.icmp6.icmp6_cksum, 6027 &nk->addr[pd->didx], 0); 6028 6029 m_copyback(m, off, sizeof(struct icmp6_hdr), 6030 (caddr_t )&pd->hdr.icmp6); 6031 break; 6032 #endif /* INET6 */ 6033 } 6034 } 6035 return (PF_PASS); 6036 6037 } else { 6038 /* 6039 * ICMP error message in response to a TCP/UDP packet. 6040 * Extract the inner TCP/UDP header and search for that state. 6041 */ 6042 6043 struct pf_pdesc pd2; 6044 bzero(&pd2, sizeof pd2); 6045 #ifdef INET 6046 struct ip h2; 6047 #endif /* INET */ 6048 #ifdef INET6 6049 struct ip6_hdr h2_6; 6050 int terminal = 0; 6051 #endif /* INET6 */ 6052 int ipoff2 = 0; 6053 int off2 = 0; 6054 6055 pd2.af = pd->af; 6056 /* Payload packet is from the opposite direction. */ 6057 pd2.sidx = (pd->dir == PF_IN) ? 1 : 0; 6058 pd2.didx = (pd->dir == PF_IN) ? 0 : 1; 6059 switch (pd->af) { 6060 #ifdef INET 6061 case AF_INET: 6062 /* offset of h2 in mbuf chain */ 6063 ipoff2 = off + ICMP_MINLEN; 6064 6065 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 6066 NULL, reason, pd2.af)) { 6067 DPFPRINTF(PF_DEBUG_MISC, 6068 ("pf: ICMP error message too short " 6069 "(ip)\n")); 6070 return (PF_DROP); 6071 } 6072 /* 6073 * ICMP error messages don't refer to non-first 6074 * fragments 6075 */ 6076 if (h2.ip_off & htons(IP_OFFMASK)) { 6077 REASON_SET(reason, PFRES_FRAG); 6078 return (PF_DROP); 6079 } 6080 6081 /* offset of protocol header that follows h2 */ 6082 off2 = ipoff2 + (h2.ip_hl << 2); 6083 6084 pd2.proto = h2.ip_p; 6085 pd2.src = (struct pf_addr *)&h2.ip_src; 6086 pd2.dst = (struct pf_addr *)&h2.ip_dst; 6087 pd2.ip_sum = &h2.ip_sum; 6088 break; 6089 #endif /* INET */ 6090 #ifdef INET6 6091 case AF_INET6: 6092 ipoff2 = off + sizeof(struct icmp6_hdr); 6093 6094 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 6095 NULL, reason, pd2.af)) { 6096 DPFPRINTF(PF_DEBUG_MISC, 6097 ("pf: ICMP error message too short " 6098 "(ip6)\n")); 6099 return (PF_DROP); 6100 } 6101 pd2.proto = h2_6.ip6_nxt; 6102 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 6103 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 6104 pd2.ip_sum = NULL; 6105 off2 = ipoff2 + sizeof(h2_6); 6106 do { 6107 switch (pd2.proto) { 6108 case IPPROTO_FRAGMENT: 6109 /* 6110 * ICMPv6 error messages for 6111 * non-first fragments 6112 */ 6113 REASON_SET(reason, PFRES_FRAG); 6114 return (PF_DROP); 6115 case IPPROTO_AH: 6116 case IPPROTO_HOPOPTS: 6117 case IPPROTO_ROUTING: 6118 case IPPROTO_DSTOPTS: { 6119 /* get next header and header length */ 6120 struct ip6_ext opt6; 6121 6122 if (!pf_pull_hdr(m, off2, &opt6, 6123 sizeof(opt6), NULL, reason, 6124 pd2.af)) { 6125 DPFPRINTF(PF_DEBUG_MISC, 6126 ("pf: ICMPv6 short opt\n")); 6127 return (PF_DROP); 6128 } 6129 if (pd2.proto == IPPROTO_AH) 6130 off2 += (opt6.ip6e_len + 2) * 4; 6131 else 6132 off2 += (opt6.ip6e_len + 1) * 8; 6133 pd2.proto = opt6.ip6e_nxt; 6134 /* goto the next header */ 6135 break; 6136 } 6137 default: 6138 terminal++; 6139 break; 6140 } 6141 } while (!terminal); 6142 break; 6143 #endif /* INET6 */ 6144 } 6145 6146 if (PF_ANEQ(pd->dst, pd2.src, pd->af)) { 6147 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6148 printf("pf: BAD ICMP %d:%d outer dst: ", 6149 icmptype, icmpcode); 6150 pf_print_host(pd->src, 0, pd->af); 6151 printf(" -> "); 6152 pf_print_host(pd->dst, 0, pd->af); 6153 printf(" inner src: "); 6154 pf_print_host(pd2.src, 0, pd2.af); 6155 printf(" -> "); 6156 pf_print_host(pd2.dst, 0, pd2.af); 6157 printf("\n"); 6158 } 6159 REASON_SET(reason, PFRES_BADSTATE); 6160 return (PF_DROP); 6161 } 6162 6163 switch (pd2.proto) { 6164 case IPPROTO_TCP: { 6165 struct tcphdr th; 6166 u_int32_t seq; 6167 struct pf_state_peer *src, *dst; 6168 u_int8_t dws; 6169 int copyback = 0; 6170 6171 /* 6172 * Only the first 8 bytes of the TCP header can be 6173 * expected. Don't access any TCP header fields after 6174 * th_seq, an ackskew test is not possible. 6175 */ 6176 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 6177 pd2.af)) { 6178 DPFPRINTF(PF_DEBUG_MISC, 6179 ("pf: ICMP error message too short " 6180 "(tcp)\n")); 6181 return (PF_DROP); 6182 } 6183 6184 key.af = pd2.af; 6185 key.proto = IPPROTO_TCP; 6186 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6187 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6188 key.port[pd2.sidx] = th.th_sport; 6189 key.port[pd2.didx] = th.th_dport; 6190 6191 STATE_LOOKUP(kif, &key, *state, pd); 6192 6193 if (pd->dir == (*state)->direction) { 6194 src = &(*state)->dst; 6195 dst = &(*state)->src; 6196 } else { 6197 src = &(*state)->src; 6198 dst = &(*state)->dst; 6199 } 6200 6201 if (src->wscale && dst->wscale) 6202 dws = dst->wscale & PF_WSCALE_MASK; 6203 else 6204 dws = 0; 6205 6206 /* Demodulate sequence number */ 6207 seq = ntohl(th.th_seq) - src->seqdiff; 6208 if (src->seqdiff) { 6209 pf_change_a(&th.th_seq, icmpsum, 6210 htonl(seq), 0); 6211 copyback = 1; 6212 } 6213 6214 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 6215 (!SEQ_GEQ(src->seqhi, seq) || 6216 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 6217 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6218 printf("pf: BAD ICMP %d:%d ", 6219 icmptype, icmpcode); 6220 pf_print_host(pd->src, 0, pd->af); 6221 printf(" -> "); 6222 pf_print_host(pd->dst, 0, pd->af); 6223 printf(" state: "); 6224 pf_print_state(*state); 6225 printf(" seq=%u\n", seq); 6226 } 6227 REASON_SET(reason, PFRES_BADSTATE); 6228 return (PF_DROP); 6229 } else { 6230 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6231 printf("pf: OK ICMP %d:%d ", 6232 icmptype, icmpcode); 6233 pf_print_host(pd->src, 0, pd->af); 6234 printf(" -> "); 6235 pf_print_host(pd->dst, 0, pd->af); 6236 printf(" state: "); 6237 pf_print_state(*state); 6238 printf(" seq=%u\n", seq); 6239 } 6240 } 6241 6242 /* translate source/destination address, if necessary */ 6243 if ((*state)->key[PF_SK_WIRE] != 6244 (*state)->key[PF_SK_STACK]) { 6245 struct pf_state_key *nk = 6246 (*state)->key[pd->didx]; 6247 6248 if (PF_ANEQ(pd2.src, 6249 &nk->addr[pd2.sidx], pd2.af) || 6250 nk->port[pd2.sidx] != th.th_sport) 6251 pf_change_icmp(pd2.src, &th.th_sport, 6252 daddr, &nk->addr[pd2.sidx], 6253 nk->port[pd2.sidx], NULL, 6254 pd2.ip_sum, icmpsum, 6255 pd->ip_sum, 0, pd2.af); 6256 6257 if (PF_ANEQ(pd2.dst, 6258 &nk->addr[pd2.didx], pd2.af) || 6259 nk->port[pd2.didx] != th.th_dport) 6260 pf_change_icmp(pd2.dst, &th.th_dport, 6261 saddr, &nk->addr[pd2.didx], 6262 nk->port[pd2.didx], NULL, 6263 pd2.ip_sum, icmpsum, 6264 pd->ip_sum, 0, pd2.af); 6265 copyback = 1; 6266 } 6267 6268 if (copyback) { 6269 switch (pd2.af) { 6270 #ifdef INET 6271 case AF_INET: 6272 m_copyback(m, off, ICMP_MINLEN, 6273 (caddr_t )&pd->hdr.icmp); 6274 m_copyback(m, ipoff2, sizeof(h2), 6275 (caddr_t )&h2); 6276 break; 6277 #endif /* INET */ 6278 #ifdef INET6 6279 case AF_INET6: 6280 m_copyback(m, off, 6281 sizeof(struct icmp6_hdr), 6282 (caddr_t )&pd->hdr.icmp6); 6283 m_copyback(m, ipoff2, sizeof(h2_6), 6284 (caddr_t )&h2_6); 6285 break; 6286 #endif /* INET6 */ 6287 } 6288 m_copyback(m, off2, 8, (caddr_t)&th); 6289 } 6290 6291 return (PF_PASS); 6292 break; 6293 } 6294 case IPPROTO_UDP: { 6295 struct udphdr uh; 6296 6297 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 6298 NULL, reason, pd2.af)) { 6299 DPFPRINTF(PF_DEBUG_MISC, 6300 ("pf: ICMP error message too short " 6301 "(udp)\n")); 6302 return (PF_DROP); 6303 } 6304 6305 key.af = pd2.af; 6306 key.proto = IPPROTO_UDP; 6307 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6308 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6309 key.port[pd2.sidx] = uh.uh_sport; 6310 key.port[pd2.didx] = uh.uh_dport; 6311 6312 STATE_LOOKUP(kif, &key, *state, pd); 6313 6314 /* translate source/destination address, if necessary */ 6315 if ((*state)->key[PF_SK_WIRE] != 6316 (*state)->key[PF_SK_STACK]) { 6317 struct pf_state_key *nk = 6318 (*state)->key[pd->didx]; 6319 6320 if (PF_ANEQ(pd2.src, 6321 &nk->addr[pd2.sidx], pd2.af) || 6322 nk->port[pd2.sidx] != uh.uh_sport) 6323 pf_change_icmp(pd2.src, &uh.uh_sport, 6324 daddr, &nk->addr[pd2.sidx], 6325 nk->port[pd2.sidx], &uh.uh_sum, 6326 pd2.ip_sum, icmpsum, 6327 pd->ip_sum, 1, pd2.af); 6328 6329 if (PF_ANEQ(pd2.dst, 6330 &nk->addr[pd2.didx], pd2.af) || 6331 nk->port[pd2.didx] != uh.uh_dport) 6332 pf_change_icmp(pd2.dst, &uh.uh_dport, 6333 saddr, &nk->addr[pd2.didx], 6334 nk->port[pd2.didx], &uh.uh_sum, 6335 pd2.ip_sum, icmpsum, 6336 pd->ip_sum, 1, pd2.af); 6337 6338 switch (pd2.af) { 6339 #ifdef INET 6340 case AF_INET: 6341 m_copyback(m, off, ICMP_MINLEN, 6342 (caddr_t )&pd->hdr.icmp); 6343 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 6344 break; 6345 #endif /* INET */ 6346 #ifdef INET6 6347 case AF_INET6: 6348 m_copyback(m, off, 6349 sizeof(struct icmp6_hdr), 6350 (caddr_t )&pd->hdr.icmp6); 6351 m_copyback(m, ipoff2, sizeof(h2_6), 6352 (caddr_t )&h2_6); 6353 break; 6354 #endif /* INET6 */ 6355 } 6356 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 6357 } 6358 return (PF_PASS); 6359 break; 6360 } 6361 #ifdef INET 6362 case IPPROTO_ICMP: { 6363 struct icmp iih; 6364 6365 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 6366 NULL, reason, pd2.af)) { 6367 DPFPRINTF(PF_DEBUG_MISC, 6368 ("pf: ICMP error message too short i" 6369 "(icmp)\n")); 6370 return (PF_DROP); 6371 } 6372 6373 key.af = pd2.af; 6374 key.proto = IPPROTO_ICMP; 6375 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6376 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6377 key.port[0] = key.port[1] = iih.icmp_id; 6378 6379 STATE_LOOKUP(kif, &key, *state, pd); 6380 6381 /* translate source/destination address, if necessary */ 6382 if ((*state)->key[PF_SK_WIRE] != 6383 (*state)->key[PF_SK_STACK]) { 6384 struct pf_state_key *nk = 6385 (*state)->key[pd->didx]; 6386 6387 if (PF_ANEQ(pd2.src, 6388 &nk->addr[pd2.sidx], pd2.af) || 6389 nk->port[pd2.sidx] != iih.icmp_id) 6390 pf_change_icmp(pd2.src, &iih.icmp_id, 6391 daddr, &nk->addr[pd2.sidx], 6392 nk->port[pd2.sidx], NULL, 6393 pd2.ip_sum, icmpsum, 6394 pd->ip_sum, 0, AF_INET); 6395 6396 if (PF_ANEQ(pd2.dst, 6397 &nk->addr[pd2.didx], pd2.af) || 6398 nk->port[pd2.didx] != iih.icmp_id) 6399 pf_change_icmp(pd2.dst, &iih.icmp_id, 6400 saddr, &nk->addr[pd2.didx], 6401 nk->port[pd2.didx], NULL, 6402 pd2.ip_sum, icmpsum, 6403 pd->ip_sum, 0, AF_INET); 6404 6405 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); 6406 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 6407 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 6408 } 6409 return (PF_PASS); 6410 break; 6411 } 6412 #endif /* INET */ 6413 #ifdef INET6 6414 case IPPROTO_ICMPV6: { 6415 struct icmp6_hdr iih; 6416 6417 if (!pf_pull_hdr(m, off2, &iih, 6418 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 6419 DPFPRINTF(PF_DEBUG_MISC, 6420 ("pf: ICMP error message too short " 6421 "(icmp6)\n")); 6422 return (PF_DROP); 6423 } 6424 6425 key.af = pd2.af; 6426 key.proto = IPPROTO_ICMPV6; 6427 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6428 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6429 key.port[0] = key.port[1] = iih.icmp6_id; 6430 6431 STATE_LOOKUP(kif, &key, *state, pd); 6432 6433 /* translate source/destination address, if necessary */ 6434 if ((*state)->key[PF_SK_WIRE] != 6435 (*state)->key[PF_SK_STACK]) { 6436 struct pf_state_key *nk = 6437 (*state)->key[pd->didx]; 6438 6439 if (PF_ANEQ(pd2.src, 6440 &nk->addr[pd2.sidx], pd2.af) || 6441 nk->port[pd2.sidx] != iih.icmp6_id) 6442 pf_change_icmp(pd2.src, &iih.icmp6_id, 6443 daddr, &nk->addr[pd2.sidx], 6444 nk->port[pd2.sidx], NULL, 6445 pd2.ip_sum, icmpsum, 6446 pd->ip_sum, 0, AF_INET6); 6447 6448 if (PF_ANEQ(pd2.dst, 6449 &nk->addr[pd2.didx], pd2.af) || 6450 nk->port[pd2.didx] != iih.icmp6_id) 6451 pf_change_icmp(pd2.dst, &iih.icmp6_id, 6452 saddr, &nk->addr[pd2.didx], 6453 nk->port[pd2.didx], NULL, 6454 pd2.ip_sum, icmpsum, 6455 pd->ip_sum, 0, AF_INET6); 6456 6457 m_copyback(m, off, sizeof(struct icmp6_hdr), 6458 (caddr_t)&pd->hdr.icmp6); 6459 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 6460 m_copyback(m, off2, sizeof(struct icmp6_hdr), 6461 (caddr_t)&iih); 6462 } 6463 return (PF_PASS); 6464 break; 6465 } 6466 #endif /* INET6 */ 6467 default: { 6468 key.af = pd2.af; 6469 key.proto = pd2.proto; 6470 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6471 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6472 key.port[0] = key.port[1] = 0; 6473 6474 STATE_LOOKUP(kif, &key, *state, pd); 6475 6476 /* translate source/destination address, if necessary */ 6477 if ((*state)->key[PF_SK_WIRE] != 6478 (*state)->key[PF_SK_STACK]) { 6479 struct pf_state_key *nk = 6480 (*state)->key[pd->didx]; 6481 6482 if (PF_ANEQ(pd2.src, 6483 &nk->addr[pd2.sidx], pd2.af)) 6484 pf_change_icmp(pd2.src, NULL, daddr, 6485 &nk->addr[pd2.sidx], 0, NULL, 6486 pd2.ip_sum, icmpsum, 6487 pd->ip_sum, 0, pd2.af); 6488 6489 if (PF_ANEQ(pd2.dst, 6490 &nk->addr[pd2.didx], pd2.af)) 6491 pf_change_icmp(pd2.dst, NULL, saddr, 6492 &nk->addr[pd2.didx], 0, NULL, 6493 pd2.ip_sum, icmpsum, 6494 pd->ip_sum, 0, pd2.af); 6495 6496 switch (pd2.af) { 6497 #ifdef INET 6498 case AF_INET: 6499 m_copyback(m, off, ICMP_MINLEN, 6500 (caddr_t)&pd->hdr.icmp); 6501 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 6502 break; 6503 #endif /* INET */ 6504 #ifdef INET6 6505 case AF_INET6: 6506 m_copyback(m, off, 6507 sizeof(struct icmp6_hdr), 6508 (caddr_t )&pd->hdr.icmp6); 6509 m_copyback(m, ipoff2, sizeof(h2_6), 6510 (caddr_t )&h2_6); 6511 break; 6512 #endif /* INET6 */ 6513 } 6514 } 6515 return (PF_PASS); 6516 break; 6517 } 6518 } 6519 } 6520 } 6521 6522 static int 6523 pf_test_state_other(struct pf_kstate **state, struct pfi_kkif *kif, 6524 struct mbuf *m, struct pf_pdesc *pd) 6525 { 6526 struct pf_state_peer *src, *dst; 6527 struct pf_state_key_cmp key; 6528 uint8_t psrc, pdst; 6529 6530 bzero(&key, sizeof(key)); 6531 key.af = pd->af; 6532 key.proto = pd->proto; 6533 if (pd->dir == PF_IN) { 6534 PF_ACPY(&key.addr[0], pd->src, key.af); 6535 PF_ACPY(&key.addr[1], pd->dst, key.af); 6536 key.port[0] = key.port[1] = 0; 6537 } else { 6538 PF_ACPY(&key.addr[1], pd->src, key.af); 6539 PF_ACPY(&key.addr[0], pd->dst, key.af); 6540 key.port[1] = key.port[0] = 0; 6541 } 6542 6543 STATE_LOOKUP(kif, &key, *state, pd); 6544 6545 if (pd->dir == (*state)->direction) { 6546 src = &(*state)->src; 6547 dst = &(*state)->dst; 6548 psrc = PF_PEER_SRC; 6549 pdst = PF_PEER_DST; 6550 } else { 6551 src = &(*state)->dst; 6552 dst = &(*state)->src; 6553 psrc = PF_PEER_DST; 6554 pdst = PF_PEER_SRC; 6555 } 6556 6557 /* update states */ 6558 if (src->state < PFOTHERS_SINGLE) 6559 pf_set_protostate(*state, psrc, PFOTHERS_SINGLE); 6560 if (dst->state == PFOTHERS_SINGLE) 6561 pf_set_protostate(*state, pdst, PFOTHERS_MULTIPLE); 6562 6563 /* update expire time */ 6564 (*state)->expire = time_uptime; 6565 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 6566 (*state)->timeout = PFTM_OTHER_MULTIPLE; 6567 else 6568 (*state)->timeout = PFTM_OTHER_SINGLE; 6569 6570 /* translate source/destination address, if necessary */ 6571 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 6572 struct pf_state_key *nk = (*state)->key[pd->didx]; 6573 6574 KASSERT(nk, ("%s: nk is null", __func__)); 6575 KASSERT(pd, ("%s: pd is null", __func__)); 6576 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 6577 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 6578 switch (pd->af) { 6579 #ifdef INET 6580 case AF_INET: 6581 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 6582 pf_change_a(&pd->src->v4.s_addr, 6583 pd->ip_sum, 6584 nk->addr[pd->sidx].v4.s_addr, 6585 0); 6586 6587 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 6588 pf_change_a(&pd->dst->v4.s_addr, 6589 pd->ip_sum, 6590 nk->addr[pd->didx].v4.s_addr, 6591 0); 6592 6593 break; 6594 #endif /* INET */ 6595 #ifdef INET6 6596 case AF_INET6: 6597 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 6598 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 6599 6600 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 6601 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 6602 #endif /* INET6 */ 6603 } 6604 } 6605 return (PF_PASS); 6606 } 6607 6608 /* 6609 * ipoff and off are measured from the start of the mbuf chain. 6610 * h must be at "ipoff" on the mbuf chain. 6611 */ 6612 void * 6613 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 6614 u_short *actionp, u_short *reasonp, sa_family_t af) 6615 { 6616 switch (af) { 6617 #ifdef INET 6618 case AF_INET: { 6619 struct ip *h = mtod(m, struct ip *); 6620 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 6621 6622 if (fragoff) { 6623 if (fragoff >= len) 6624 ACTION_SET(actionp, PF_PASS); 6625 else { 6626 ACTION_SET(actionp, PF_DROP); 6627 REASON_SET(reasonp, PFRES_FRAG); 6628 } 6629 return (NULL); 6630 } 6631 if (m->m_pkthdr.len < off + len || 6632 ntohs(h->ip_len) < off + len) { 6633 ACTION_SET(actionp, PF_DROP); 6634 REASON_SET(reasonp, PFRES_SHORT); 6635 return (NULL); 6636 } 6637 break; 6638 } 6639 #endif /* INET */ 6640 #ifdef INET6 6641 case AF_INET6: { 6642 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 6643 6644 if (m->m_pkthdr.len < off + len || 6645 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 6646 (unsigned)(off + len)) { 6647 ACTION_SET(actionp, PF_DROP); 6648 REASON_SET(reasonp, PFRES_SHORT); 6649 return (NULL); 6650 } 6651 break; 6652 } 6653 #endif /* INET6 */ 6654 } 6655 m_copydata(m, off, len, p); 6656 return (p); 6657 } 6658 6659 int 6660 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kkif *kif, 6661 int rtableid) 6662 { 6663 struct ifnet *ifp; 6664 6665 /* 6666 * Skip check for addresses with embedded interface scope, 6667 * as they would always match anyway. 6668 */ 6669 if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6)) 6670 return (1); 6671 6672 if (af != AF_INET && af != AF_INET6) 6673 return (0); 6674 6675 /* Skip checks for ipsec interfaces */ 6676 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 6677 return (1); 6678 6679 ifp = (kif != NULL) ? kif->pfik_ifp : NULL; 6680 6681 switch (af) { 6682 #ifdef INET6 6683 case AF_INET6: 6684 return (fib6_check_urpf(rtableid, &addr->v6, 0, NHR_NONE, 6685 ifp)); 6686 #endif 6687 #ifdef INET 6688 case AF_INET: 6689 return (fib4_check_urpf(rtableid, addr->v4, 0, NHR_NONE, 6690 ifp)); 6691 #endif 6692 } 6693 6694 return (0); 6695 } 6696 6697 #ifdef INET 6698 static void 6699 pf_route(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, 6700 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) 6701 { 6702 struct mbuf *m0, *m1, *md; 6703 struct sockaddr_in dst; 6704 struct ip *ip; 6705 struct ifnet *ifp = NULL; 6706 struct pf_addr naddr; 6707 struct pf_ksrc_node *sn = NULL; 6708 int error = 0; 6709 uint16_t ip_len, ip_off; 6710 int r_rt, r_dir; 6711 6712 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 6713 6714 if (s) { 6715 r_rt = s->rt; 6716 r_dir = s->direction; 6717 } else { 6718 r_rt = r->rt; 6719 r_dir = r->direction; 6720 } 6721 6722 KASSERT(pd->dir == PF_IN || pd->dir == PF_OUT || 6723 r_dir == PF_IN || r_dir == PF_OUT, ("%s: invalid direction", 6724 __func__)); 6725 6726 if ((pd->pf_mtag == NULL && 6727 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 6728 pd->pf_mtag->routed++ > 3) { 6729 m0 = *m; 6730 *m = NULL; 6731 goto bad_locked; 6732 } 6733 6734 if (r_rt == PF_DUPTO) { 6735 if ((pd->pf_mtag->flags & PF_MTAG_FLAG_DUPLICATED)) { 6736 if (s == NULL) { 6737 ifp = r->rpool.cur->kif ? 6738 r->rpool.cur->kif->pfik_ifp : NULL; 6739 } else { 6740 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6741 /* If pfsync'd */ 6742 if (ifp == NULL) 6743 ifp = r->rpool.cur->kif ? 6744 r->rpool.cur->kif->pfik_ifp : NULL; 6745 PF_STATE_UNLOCK(s); 6746 } 6747 if (ifp == oifp) { 6748 /* When the 2nd interface is not skipped */ 6749 return; 6750 } else { 6751 m0 = *m; 6752 *m = NULL; 6753 goto bad; 6754 } 6755 } else { 6756 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUPLICATED; 6757 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { 6758 if (s) 6759 PF_STATE_UNLOCK(s); 6760 return; 6761 } 6762 } 6763 } else { 6764 if ((r_rt == PF_REPLYTO) == (r_dir == pd->dir)) { 6765 pf_dummynet(pd, s, r, m); 6766 if (s) 6767 PF_STATE_UNLOCK(s); 6768 return; 6769 } 6770 m0 = *m; 6771 } 6772 6773 ip = mtod(m0, struct ip *); 6774 6775 bzero(&dst, sizeof(dst)); 6776 dst.sin_family = AF_INET; 6777 dst.sin_len = sizeof(dst); 6778 dst.sin_addr = ip->ip_dst; 6779 6780 bzero(&naddr, sizeof(naddr)); 6781 6782 if (s == NULL) { 6783 if (TAILQ_EMPTY(&r->rpool.list)) { 6784 DPFPRINTF(PF_DEBUG_URGENT, 6785 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 6786 goto bad_locked; 6787 } 6788 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 6789 &naddr, NULL, &sn); 6790 if (!PF_AZERO(&naddr, AF_INET)) 6791 dst.sin_addr.s_addr = naddr.v4.s_addr; 6792 ifp = r->rpool.cur->kif ? 6793 r->rpool.cur->kif->pfik_ifp : NULL; 6794 } else { 6795 if (!PF_AZERO(&s->rt_addr, AF_INET)) 6796 dst.sin_addr.s_addr = 6797 s->rt_addr.v4.s_addr; 6798 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6799 PF_STATE_UNLOCK(s); 6800 } 6801 /* If pfsync'd */ 6802 if (ifp == NULL) 6803 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6804 if (ifp == NULL) 6805 goto bad; 6806 6807 if (pd->dir == PF_IN) { 6808 if (pf_test(PF_OUT, 0, ifp, &m0, inp, &pd->act) != PF_PASS) 6809 goto bad; 6810 else if (m0 == NULL) 6811 goto done; 6812 if (m0->m_len < sizeof(struct ip)) { 6813 DPFPRINTF(PF_DEBUG_URGENT, 6814 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 6815 goto bad; 6816 } 6817 ip = mtod(m0, struct ip *); 6818 } 6819 6820 if (ifp->if_flags & IFF_LOOPBACK) 6821 m0->m_flags |= M_SKIP_FIREWALL; 6822 6823 ip_len = ntohs(ip->ip_len); 6824 ip_off = ntohs(ip->ip_off); 6825 6826 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 6827 m0->m_pkthdr.csum_flags |= CSUM_IP; 6828 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 6829 in_delayed_cksum(m0); 6830 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 6831 } 6832 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 6833 pf_sctp_checksum(m0, (uint32_t)(ip->ip_hl << 2)); 6834 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 6835 } 6836 6837 /* 6838 * If small enough for interface, or the interface will take 6839 * care of the fragmentation for us, we can just send directly. 6840 */ 6841 if (ip_len <= ifp->if_mtu || 6842 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 6843 ip->ip_sum = 0; 6844 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 6845 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6846 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 6847 } 6848 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 6849 6850 md = m0; 6851 error = pf_dummynet_route(pd, s, r, ifp, sintosa(&dst), &md); 6852 if (md != NULL) 6853 error = (*ifp->if_output)(ifp, md, sintosa(&dst), NULL); 6854 goto done; 6855 } 6856 6857 /* Balk when DF bit is set or the interface didn't support TSO. */ 6858 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 6859 error = EMSGSIZE; 6860 KMOD_IPSTAT_INC(ips_cantfrag); 6861 if (r_rt != PF_DUPTO) { 6862 if (s && pd->nat_rule != NULL) 6863 PACKET_UNDO_NAT(m0, pd, 6864 (ip->ip_hl << 2) + (ip_off & IP_OFFMASK), 6865 s); 6866 6867 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6868 ifp->if_mtu); 6869 goto done; 6870 } else 6871 goto bad; 6872 } 6873 6874 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 6875 if (error) 6876 goto bad; 6877 6878 for (; m0; m0 = m1) { 6879 m1 = m0->m_nextpkt; 6880 m0->m_nextpkt = NULL; 6881 if (error == 0) { 6882 m_clrprotoflags(m0); 6883 md = m0; 6884 error = pf_dummynet_route(pd, s, r, ifp, 6885 sintosa(&dst), &md); 6886 if (md != NULL) 6887 error = (*ifp->if_output)(ifp, md, 6888 sintosa(&dst), NULL); 6889 } else 6890 m_freem(m0); 6891 } 6892 6893 if (error == 0) 6894 KMOD_IPSTAT_INC(ips_fragmented); 6895 6896 done: 6897 if (r_rt != PF_DUPTO) 6898 *m = NULL; 6899 return; 6900 6901 bad_locked: 6902 if (s) 6903 PF_STATE_UNLOCK(s); 6904 bad: 6905 m_freem(m0); 6906 goto done; 6907 } 6908 #endif /* INET */ 6909 6910 #ifdef INET6 6911 static void 6912 pf_route6(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, 6913 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) 6914 { 6915 struct mbuf *m0, *md; 6916 struct sockaddr_in6 dst; 6917 struct ip6_hdr *ip6; 6918 struct ifnet *ifp = NULL; 6919 struct pf_addr naddr; 6920 struct pf_ksrc_node *sn = NULL; 6921 int r_rt, r_dir; 6922 6923 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 6924 6925 if (s) { 6926 r_rt = s->rt; 6927 r_dir = s->direction; 6928 } else { 6929 r_rt = r->rt; 6930 r_dir = r->direction; 6931 } 6932 6933 KASSERT(pd->dir == PF_IN || pd->dir == PF_OUT || 6934 r_dir == PF_IN || r_dir == PF_OUT, ("%s: invalid direction", 6935 __func__)); 6936 6937 if ((pd->pf_mtag == NULL && 6938 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 6939 pd->pf_mtag->routed++ > 3) { 6940 m0 = *m; 6941 *m = NULL; 6942 goto bad_locked; 6943 } 6944 6945 if (r_rt == PF_DUPTO) { 6946 if ((pd->pf_mtag->flags & PF_MTAG_FLAG_DUPLICATED)) { 6947 if (s == NULL) { 6948 ifp = r->rpool.cur->kif ? 6949 r->rpool.cur->kif->pfik_ifp : NULL; 6950 } else { 6951 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6952 /* If pfsync'd */ 6953 if (ifp == NULL) 6954 ifp = r->rpool.cur->kif ? 6955 r->rpool.cur->kif->pfik_ifp : NULL; 6956 PF_STATE_UNLOCK(s); 6957 } 6958 if (ifp == oifp) { 6959 /* When the 2nd interface is not skipped */ 6960 return; 6961 } else { 6962 m0 = *m; 6963 *m = NULL; 6964 goto bad; 6965 } 6966 } else { 6967 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUPLICATED; 6968 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { 6969 if (s) 6970 PF_STATE_UNLOCK(s); 6971 return; 6972 } 6973 } 6974 } else { 6975 if ((r_rt == PF_REPLYTO) == (r_dir == pd->dir)) { 6976 pf_dummynet(pd, s, r, m); 6977 if (s) 6978 PF_STATE_UNLOCK(s); 6979 return; 6980 } 6981 m0 = *m; 6982 } 6983 6984 ip6 = mtod(m0, struct ip6_hdr *); 6985 6986 bzero(&dst, sizeof(dst)); 6987 dst.sin6_family = AF_INET6; 6988 dst.sin6_len = sizeof(dst); 6989 dst.sin6_addr = ip6->ip6_dst; 6990 6991 bzero(&naddr, sizeof(naddr)); 6992 6993 if (s == NULL) { 6994 if (TAILQ_EMPTY(&r->rpool.list)) { 6995 DPFPRINTF(PF_DEBUG_URGENT, 6996 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 6997 goto bad_locked; 6998 } 6999 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 7000 &naddr, NULL, &sn); 7001 if (!PF_AZERO(&naddr, AF_INET6)) 7002 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 7003 &naddr, AF_INET6); 7004 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 7005 } else { 7006 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 7007 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 7008 &s->rt_addr, AF_INET6); 7009 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7010 } 7011 7012 if (s) 7013 PF_STATE_UNLOCK(s); 7014 7015 /* If pfsync'd */ 7016 if (ifp == NULL) 7017 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 7018 if (ifp == NULL) 7019 goto bad; 7020 7021 if (pd->dir == PF_IN) { 7022 if (pf_test6(PF_OUT, 0, ifp, &m0, inp, &pd->act) != PF_PASS) 7023 goto bad; 7024 else if (m0 == NULL) 7025 goto done; 7026 if (m0->m_len < sizeof(struct ip6_hdr)) { 7027 DPFPRINTF(PF_DEBUG_URGENT, 7028 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 7029 __func__)); 7030 goto bad; 7031 } 7032 ip6 = mtod(m0, struct ip6_hdr *); 7033 } 7034 7035 if (ifp->if_flags & IFF_LOOPBACK) 7036 m0->m_flags |= M_SKIP_FIREWALL; 7037 7038 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 & 7039 ~ifp->if_hwassist) { 7040 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6); 7041 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr)); 7042 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 7043 } 7044 7045 /* 7046 * If the packet is too large for the outgoing interface, 7047 * send back an icmp6 error. 7048 */ 7049 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 7050 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 7051 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 7052 md = m0; 7053 pf_dummynet_route(pd, s, r, ifp, sintosa(&dst), &md); 7054 if (md != NULL) 7055 nd6_output_ifp(ifp, ifp, md, &dst, NULL); 7056 } 7057 else { 7058 in6_ifstat_inc(ifp, ifs6_in_toobig); 7059 if (r_rt != PF_DUPTO) { 7060 if (s && pd->nat_rule != NULL) 7061 PACKET_UNDO_NAT(m0, pd, 7062 ((caddr_t)ip6 - m0->m_data) + 7063 sizeof(struct ip6_hdr), s); 7064 7065 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 7066 } else 7067 goto bad; 7068 } 7069 7070 done: 7071 if (r_rt != PF_DUPTO) 7072 *m = NULL; 7073 return; 7074 7075 bad_locked: 7076 if (s) 7077 PF_STATE_UNLOCK(s); 7078 bad: 7079 m_freem(m0); 7080 goto done; 7081 } 7082 #endif /* INET6 */ 7083 7084 /* 7085 * FreeBSD supports cksum offloads for the following drivers. 7086 * em(4), fxp(4), lge(4), nge(4), re(4), ti(4), txp(4), xl(4) 7087 * 7088 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 7089 * network driver performed cksum including pseudo header, need to verify 7090 * csum_data 7091 * CSUM_DATA_VALID : 7092 * network driver performed cksum, needs to additional pseudo header 7093 * cksum computation with partial csum_data(i.e. lack of H/W support for 7094 * pseudo header, for instance sk(4) and possibly gem(4)) 7095 * 7096 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 7097 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 7098 * TCP/UDP layer. 7099 * Also, set csum_data to 0xffff to force cksum validation. 7100 */ 7101 static int 7102 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 7103 { 7104 u_int16_t sum = 0; 7105 int hw_assist = 0; 7106 struct ip *ip; 7107 7108 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 7109 return (1); 7110 if (m->m_pkthdr.len < off + len) 7111 return (1); 7112 7113 switch (p) { 7114 case IPPROTO_TCP: 7115 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 7116 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 7117 sum = m->m_pkthdr.csum_data; 7118 } else { 7119 ip = mtod(m, struct ip *); 7120 sum = in_pseudo(ip->ip_src.s_addr, 7121 ip->ip_dst.s_addr, htonl((u_short)len + 7122 m->m_pkthdr.csum_data + IPPROTO_TCP)); 7123 } 7124 sum ^= 0xffff; 7125 ++hw_assist; 7126 } 7127 break; 7128 case IPPROTO_UDP: 7129 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 7130 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 7131 sum = m->m_pkthdr.csum_data; 7132 } else { 7133 ip = mtod(m, struct ip *); 7134 sum = in_pseudo(ip->ip_src.s_addr, 7135 ip->ip_dst.s_addr, htonl((u_short)len + 7136 m->m_pkthdr.csum_data + IPPROTO_UDP)); 7137 } 7138 sum ^= 0xffff; 7139 ++hw_assist; 7140 } 7141 break; 7142 case IPPROTO_ICMP: 7143 #ifdef INET6 7144 case IPPROTO_ICMPV6: 7145 #endif /* INET6 */ 7146 break; 7147 default: 7148 return (1); 7149 } 7150 7151 if (!hw_assist) { 7152 switch (af) { 7153 case AF_INET: 7154 if (p == IPPROTO_ICMP) { 7155 if (m->m_len < off) 7156 return (1); 7157 m->m_data += off; 7158 m->m_len -= off; 7159 sum = in_cksum(m, len); 7160 m->m_data -= off; 7161 m->m_len += off; 7162 } else { 7163 if (m->m_len < sizeof(struct ip)) 7164 return (1); 7165 sum = in4_cksum(m, p, off, len); 7166 } 7167 break; 7168 #ifdef INET6 7169 case AF_INET6: 7170 if (m->m_len < sizeof(struct ip6_hdr)) 7171 return (1); 7172 sum = in6_cksum(m, p, off, len); 7173 break; 7174 #endif /* INET6 */ 7175 default: 7176 return (1); 7177 } 7178 } 7179 if (sum) { 7180 switch (p) { 7181 case IPPROTO_TCP: 7182 { 7183 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 7184 break; 7185 } 7186 case IPPROTO_UDP: 7187 { 7188 KMOD_UDPSTAT_INC(udps_badsum); 7189 break; 7190 } 7191 #ifdef INET 7192 case IPPROTO_ICMP: 7193 { 7194 KMOD_ICMPSTAT_INC(icps_checksum); 7195 break; 7196 } 7197 #endif 7198 #ifdef INET6 7199 case IPPROTO_ICMPV6: 7200 { 7201 KMOD_ICMP6STAT_INC(icp6s_checksum); 7202 break; 7203 } 7204 #endif /* INET6 */ 7205 } 7206 return (1); 7207 } else { 7208 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 7209 m->m_pkthdr.csum_flags |= 7210 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 7211 m->m_pkthdr.csum_data = 0xffff; 7212 } 7213 } 7214 return (0); 7215 } 7216 7217 static bool 7218 pf_pdesc_to_dnflow(const struct pf_pdesc *pd, const struct pf_krule *r, 7219 const struct pf_kstate *s, struct ip_fw_args *dnflow) 7220 { 7221 int dndir = r->direction; 7222 7223 if (s && dndir == PF_INOUT) { 7224 dndir = s->direction; 7225 } else if (dndir == PF_INOUT) { 7226 /* Assume primary direction. Happens when we've set dnpipe in 7227 * the ethernet level code. */ 7228 dndir = pd->dir; 7229 } 7230 7231 memset(dnflow, 0, sizeof(*dnflow)); 7232 7233 if (pd->dport != NULL) 7234 dnflow->f_id.dst_port = ntohs(*pd->dport); 7235 if (pd->sport != NULL) 7236 dnflow->f_id.src_port = ntohs(*pd->sport); 7237 7238 if (pd->dir == PF_IN) 7239 dnflow->flags |= IPFW_ARGS_IN; 7240 else 7241 dnflow->flags |= IPFW_ARGS_OUT; 7242 7243 if (pd->dir != dndir && pd->act.dnrpipe) { 7244 dnflow->rule.info = pd->act.dnrpipe; 7245 } 7246 else if (pd->dir == dndir && pd->act.dnpipe) { 7247 dnflow->rule.info = pd->act.dnpipe; 7248 } 7249 else { 7250 return (false); 7251 } 7252 7253 dnflow->rule.info |= IPFW_IS_DUMMYNET; 7254 if (r->free_flags & PFRULE_DN_IS_PIPE || pd->act.flags & PFSTATE_DN_IS_PIPE) 7255 dnflow->rule.info |= IPFW_IS_PIPE; 7256 7257 dnflow->f_id.proto = pd->proto; 7258 dnflow->f_id.extra = dnflow->rule.info; 7259 switch (pd->af) { 7260 case AF_INET: 7261 dnflow->f_id.addr_type = 4; 7262 dnflow->f_id.src_ip = ntohl(pd->src->v4.s_addr); 7263 dnflow->f_id.dst_ip = ntohl(pd->dst->v4.s_addr); 7264 break; 7265 case AF_INET6: 7266 dnflow->flags |= IPFW_ARGS_IP6; 7267 dnflow->f_id.addr_type = 6; 7268 dnflow->f_id.src_ip6 = pd->src->v6; 7269 dnflow->f_id.dst_ip6 = pd->dst->v6; 7270 break; 7271 default: 7272 panic("Invalid AF"); 7273 break; 7274 } 7275 7276 return (true); 7277 } 7278 7279 int 7280 pf_test_eth(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, 7281 struct inpcb *inp) 7282 { 7283 struct pfi_kkif *kif; 7284 struct mbuf *m = *m0; 7285 7286 M_ASSERTPKTHDR(m); 7287 MPASS(ifp->if_vnet == curvnet); 7288 NET_EPOCH_ASSERT(); 7289 7290 if (!V_pf_status.running) 7291 return (PF_PASS); 7292 7293 kif = (struct pfi_kkif *)ifp->if_pf_kif; 7294 7295 if (kif == NULL) { 7296 DPFPRINTF(PF_DEBUG_URGENT, 7297 ("%s: kif == NULL, if_xname %s\n", __func__, ifp->if_xname)); 7298 return (PF_DROP); 7299 } 7300 if (kif->pfik_flags & PFI_IFLAG_SKIP) 7301 return (PF_PASS); 7302 7303 if (m->m_flags & M_SKIP_FIREWALL) 7304 return (PF_PASS); 7305 7306 /* Stateless! */ 7307 return (pf_test_eth_rule(dir, kif, m0)); 7308 } 7309 7310 static int 7311 pf_dummynet(struct pf_pdesc *pd, struct pf_kstate *s, 7312 struct pf_krule *r, struct mbuf **m0) 7313 { 7314 return (pf_dummynet_route(pd, s, r, NULL, NULL, m0)); 7315 } 7316 7317 static int 7318 pf_dummynet_route(struct pf_pdesc *pd, struct pf_kstate *s, 7319 struct pf_krule *r, struct ifnet *ifp, struct sockaddr *sa, 7320 struct mbuf **m0) 7321 { 7322 NET_EPOCH_ASSERT(); 7323 7324 if (pd->act.dnpipe || pd->act.dnrpipe) { 7325 struct ip_fw_args dnflow; 7326 if (ip_dn_io_ptr == NULL) { 7327 m_freem(*m0); 7328 *m0 = NULL; 7329 return (ENOMEM); 7330 } 7331 7332 if (pd->pf_mtag == NULL && 7333 ((pd->pf_mtag = pf_get_mtag(*m0)) == NULL)) { 7334 m_freem(*m0); 7335 *m0 = NULL; 7336 return (ENOMEM); 7337 } 7338 7339 if (ifp != NULL) { 7340 pd->pf_mtag->flags |= PF_MTAG_FLAG_ROUTE_TO; 7341 7342 pd->pf_mtag->if_index = ifp->if_index; 7343 pd->pf_mtag->if_idxgen = ifp->if_idxgen; 7344 7345 MPASS(sa != NULL); 7346 7347 if (pd->af == AF_INET) 7348 memcpy(&pd->pf_mtag->dst, sa, 7349 sizeof(struct sockaddr_in)); 7350 else 7351 memcpy(&pd->pf_mtag->dst, sa, 7352 sizeof(struct sockaddr_in6)); 7353 } 7354 7355 if (pf_pdesc_to_dnflow(pd, r, s, &dnflow)) { 7356 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUMMYNET; 7357 ip_dn_io_ptr(m0, &dnflow); 7358 if (*m0 != NULL) { 7359 pd->pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 7360 pd->pf_mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 7361 } 7362 } 7363 } 7364 7365 return (0); 7366 } 7367 7368 #ifdef INET 7369 int 7370 pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, 7371 struct inpcb *inp, struct pf_rule_actions *default_actions) 7372 { 7373 struct pfi_kkif *kif; 7374 u_short action, reason = 0; 7375 struct mbuf *m = *m0; 7376 struct ip *h = NULL; 7377 struct m_tag *ipfwtag; 7378 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 7379 struct pf_kstate *s = NULL; 7380 struct pf_kruleset *ruleset = NULL; 7381 struct pf_pdesc pd; 7382 int off, dirndx, use_2nd_queue = 0; 7383 uint16_t tag; 7384 uint8_t rt; 7385 7386 PF_RULES_RLOCK_TRACKER; 7387 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); 7388 M_ASSERTPKTHDR(m); 7389 7390 if (!V_pf_status.running) 7391 return (PF_PASS); 7392 7393 PF_RULES_RLOCK(); 7394 7395 kif = (struct pfi_kkif *)ifp->if_pf_kif; 7396 7397 if (__predict_false(kif == NULL)) { 7398 DPFPRINTF(PF_DEBUG_URGENT, 7399 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 7400 PF_RULES_RUNLOCK(); 7401 return (PF_DROP); 7402 } 7403 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 7404 PF_RULES_RUNLOCK(); 7405 return (PF_PASS); 7406 } 7407 7408 if (m->m_flags & M_SKIP_FIREWALL) { 7409 PF_RULES_RUNLOCK(); 7410 return (PF_PASS); 7411 } 7412 7413 memset(&pd, 0, sizeof(pd)); 7414 if (default_actions != NULL) 7415 memcpy(&pd.act, default_actions, sizeof(pd.act)); 7416 pd.pf_mtag = pf_find_mtag(m); 7417 7418 if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_MTAG_FLAG_ROUTE_TO)) { 7419 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 7420 7421 ifp = ifnet_byindexgen(pd.pf_mtag->if_index, 7422 pd.pf_mtag->if_idxgen); 7423 if (ifp == NULL || ifp->if_flags & IFF_DYING) { 7424 PF_RULES_RUNLOCK(); 7425 m_freem(*m0); 7426 *m0 = NULL; 7427 return (PF_PASS); 7428 } 7429 PF_RULES_RUNLOCK(); 7430 (ifp->if_output)(ifp, m, sintosa(&pd.pf_mtag->dst), NULL); 7431 *m0 = NULL; 7432 return (PF_PASS); 7433 } 7434 7435 if (pd.pf_mtag && pd.pf_mtag->dnpipe) { 7436 pd.act.dnpipe = pd.pf_mtag->dnpipe; 7437 pd.act.flags = pd.pf_mtag->dnflags; 7438 } 7439 7440 if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL && 7441 pd.pf_mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 7442 /* Dummynet re-injects packets after they've 7443 * completed their delay. We've already 7444 * processed them, so pass unconditionally. */ 7445 7446 /* But only once. We may see the packet multiple times (e.g. 7447 * PFIL_IN/PFIL_OUT). */ 7448 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 7449 PF_RULES_RUNLOCK(); 7450 7451 return (PF_PASS); 7452 } 7453 7454 pd.sport = pd.dport = NULL; 7455 pd.proto_sum = NULL; 7456 pd.dir = dir; 7457 pd.sidx = (dir == PF_IN) ? 0 : 1; 7458 pd.didx = (dir == PF_IN) ? 1 : 0; 7459 pd.af = AF_INET; 7460 pd.act.rtableid = -1; 7461 7462 if (__predict_false(ip_divert_ptr != NULL) && 7463 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 7464 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 7465 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 7466 if (pd.pf_mtag == NULL && 7467 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 7468 action = PF_DROP; 7469 goto done; 7470 } 7471 pd.pf_mtag->flags |= PF_MTAG_FLAG_PACKET_LOOPED; 7472 m_tag_delete(m, ipfwtag); 7473 } 7474 if (pd.pf_mtag && pd.pf_mtag->flags & PF_MTAG_FLAG_FASTFWD_OURS_PRESENT) { 7475 m->m_flags |= M_FASTFWD_OURS; 7476 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_FASTFWD_OURS_PRESENT; 7477 } 7478 } else if (pf_normalize_ip(m0, kif, &reason, &pd) != PF_PASS) { 7479 /* We do IP header normalization and packet reassembly here */ 7480 action = PF_DROP; 7481 goto done; 7482 } 7483 m = *m0; /* pf_normalize messes with m0 */ 7484 h = mtod(m, struct ip *); 7485 7486 off = h->ip_hl << 2; 7487 if (off < (int)sizeof(struct ip)) { 7488 action = PF_DROP; 7489 REASON_SET(&reason, PFRES_SHORT); 7490 pd.act.log = PF_LOG_FORCE; 7491 goto done; 7492 } 7493 7494 pd.src = (struct pf_addr *)&h->ip_src; 7495 pd.dst = (struct pf_addr *)&h->ip_dst; 7496 pd.ip_sum = &h->ip_sum; 7497 pd.proto = h->ip_p; 7498 pd.tos = h->ip_tos & ~IPTOS_ECN_MASK; 7499 pd.tot_len = ntohs(h->ip_len); 7500 7501 /* handle fragments that didn't get reassembled by normalization */ 7502 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 7503 action = pf_test_fragment(&r, kif, m, h, &pd, &a, &ruleset); 7504 goto done; 7505 } 7506 7507 switch (h->ip_p) { 7508 case IPPROTO_TCP: { 7509 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), 7510 &action, &reason, AF_INET)) { 7511 if (action != PF_PASS) 7512 pd.act.log = PF_LOG_FORCE; 7513 goto done; 7514 } 7515 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); 7516 7517 pd.sport = &pd.hdr.tcp.th_sport; 7518 pd.dport = &pd.hdr.tcp.th_dport; 7519 7520 /* Respond to SYN with a syncookie. */ 7521 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN && 7522 pd.dir == PF_IN && pf_synflood_check(&pd)) { 7523 pf_syncookie_send(m, off, &pd); 7524 action = PF_DROP; 7525 break; 7526 } 7527 7528 if ((pd.hdr.tcp.th_flags & TH_ACK) && pd.p_len == 0) 7529 use_2nd_queue = 1; 7530 action = pf_normalize_tcp(kif, m, 0, off, h, &pd); 7531 if (action == PF_DROP) 7532 goto done; 7533 action = pf_test_state_tcp(&s, kif, m, off, h, &pd, &reason); 7534 if (action == PF_PASS) { 7535 if (V_pfsync_update_state_ptr != NULL) 7536 V_pfsync_update_state_ptr(s); 7537 r = s->rule.ptr; 7538 a = s->anchor.ptr; 7539 } else if (s == NULL) { 7540 /* Validate remote SYN|ACK, re-create original SYN if 7541 * valid. */ 7542 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == 7543 TH_ACK && pf_syncookie_validate(&pd) && 7544 pd.dir == PF_IN) { 7545 struct mbuf *msyn; 7546 7547 msyn = pf_syncookie_recreate_syn(h->ip_ttl, 7548 off,&pd); 7549 if (msyn == NULL) { 7550 action = PF_DROP; 7551 break; 7552 } 7553 7554 action = pf_test(dir, pflags, ifp, &msyn, inp, &pd.act); 7555 m_freem(msyn); 7556 7557 if (action == PF_PASS) { 7558 action = pf_test_state_tcp(&s, kif, m, 7559 off, h, &pd, &reason); 7560 if (action != PF_PASS || s == NULL) { 7561 action = PF_DROP; 7562 break; 7563 } 7564 7565 s->src.seqhi = ntohl(pd.hdr.tcp.th_ack) 7566 - 1; 7567 s->src.seqlo = ntohl(pd.hdr.tcp.th_seq) 7568 - 1; 7569 pf_set_protostate(s, PF_PEER_SRC, 7570 PF_TCPS_PROXY_DST); 7571 7572 action = pf_synproxy(&pd, &s, &reason); 7573 if (action != PF_PASS) 7574 break; 7575 } 7576 break; 7577 } 7578 else { 7579 action = pf_test_rule(&r, &s, kif, m, off, 7580 &pd, &a, &ruleset, inp); 7581 } 7582 } 7583 break; 7584 } 7585 7586 case IPPROTO_UDP: { 7587 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), 7588 &action, &reason, AF_INET)) { 7589 if (action != PF_PASS) 7590 pd.act.log = PF_LOG_FORCE; 7591 goto done; 7592 } 7593 pd.sport = &pd.hdr.udp.uh_sport; 7594 pd.dport = &pd.hdr.udp.uh_dport; 7595 if (pd.hdr.udp.uh_dport == 0 || 7596 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || 7597 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { 7598 action = PF_DROP; 7599 REASON_SET(&reason, PFRES_SHORT); 7600 goto done; 7601 } 7602 action = pf_test_state_udp(&s, kif, m, off, h, &pd); 7603 if (action == PF_PASS) { 7604 if (V_pfsync_update_state_ptr != NULL) 7605 V_pfsync_update_state_ptr(s); 7606 r = s->rule.ptr; 7607 a = s->anchor.ptr; 7608 } else if (s == NULL) 7609 action = pf_test_rule(&r, &s, kif, m, off, &pd, 7610 &a, &ruleset, inp); 7611 break; 7612 } 7613 7614 case IPPROTO_SCTP: { 7615 if (!pf_pull_hdr(m, off, &pd.hdr.sctp, sizeof(pd.hdr.sctp), 7616 &action, &reason, AF_INET)) { 7617 if (action != PF_PASS) 7618 pd.act.log |= PF_LOG_FORCE; 7619 goto done; 7620 } 7621 pd.sport = &pd.hdr.sctp.src_port; 7622 pd.dport = &pd.hdr.sctp.dest_port; 7623 if (pd.hdr.sctp.src_port == 0 || pd.hdr.sctp.dest_port == 0) { 7624 action = PF_DROP; 7625 REASON_SET(&reason, PFRES_SHORT); 7626 goto done; 7627 } 7628 action = pf_normalize_sctp(dir, kif, m, 0, off, h, &pd); 7629 if (action == PF_DROP) 7630 goto done; 7631 action = pf_test_state_sctp(&s, kif, m, off, h, &pd, 7632 &reason); 7633 if (action == PF_PASS) { 7634 if (V_pfsync_update_state_ptr != NULL) 7635 V_pfsync_update_state_ptr(s); 7636 r = s->rule.ptr; 7637 a = s->anchor.ptr; 7638 } else { 7639 action = pf_test_rule(&r, &s, kif, m, off, 7640 &pd, &a, &ruleset, inp); 7641 } 7642 break; 7643 } 7644 7645 case IPPROTO_ICMP: { 7646 if (!pf_pull_hdr(m, off, &pd.hdr.icmp, ICMP_MINLEN, 7647 &action, &reason, AF_INET)) { 7648 if (action != PF_PASS) 7649 pd.act.log = PF_LOG_FORCE; 7650 goto done; 7651 } 7652 action = pf_test_state_icmp(&s, kif, m, off, h, &pd, &reason); 7653 if (action == PF_PASS) { 7654 if (V_pfsync_update_state_ptr != NULL) 7655 V_pfsync_update_state_ptr(s); 7656 r = s->rule.ptr; 7657 a = s->anchor.ptr; 7658 } else if (s == NULL) 7659 action = pf_test_rule(&r, &s, kif, m, off, &pd, 7660 &a, &ruleset, inp); 7661 break; 7662 } 7663 7664 #ifdef INET6 7665 case IPPROTO_ICMPV6: { 7666 action = PF_DROP; 7667 DPFPRINTF(PF_DEBUG_MISC, 7668 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 7669 goto done; 7670 } 7671 #endif 7672 7673 default: 7674 action = pf_test_state_other(&s, kif, m, &pd); 7675 if (action == PF_PASS) { 7676 if (V_pfsync_update_state_ptr != NULL) 7677 V_pfsync_update_state_ptr(s); 7678 r = s->rule.ptr; 7679 a = s->anchor.ptr; 7680 } else if (s == NULL) 7681 action = pf_test_rule(&r, &s, kif, m, off, &pd, 7682 &a, &ruleset, inp); 7683 break; 7684 } 7685 7686 done: 7687 PF_RULES_RUNLOCK(); 7688 if (action == PF_PASS && h->ip_hl > 5 && 7689 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 7690 action = PF_DROP; 7691 REASON_SET(&reason, PFRES_IPOPTIONS); 7692 pd.act.log = PF_LOG_FORCE; 7693 DPFPRINTF(PF_DEBUG_MISC, 7694 ("pf: dropping packet with ip options\n")); 7695 } 7696 7697 if (s) { 7698 memcpy(&pd.act, &s->act, sizeof(struct pf_rule_actions)); 7699 tag = s->tag; 7700 rt = s->rt; 7701 } else { 7702 tag = r->tag; 7703 rt = r->rt; 7704 } 7705 7706 if (tag > 0 && pf_tag_packet(m, &pd, tag)) { 7707 action = PF_DROP; 7708 REASON_SET(&reason, PFRES_MEMORY); 7709 } 7710 7711 pf_scrub_ip(&m, &pd); 7712 if (pd.proto == IPPROTO_TCP && pd.act.max_mss) 7713 pf_normalize_mss(m, off, &pd); 7714 7715 if (pd.act.rtableid >= 0) 7716 M_SETFIB(m, pd.act.rtableid); 7717 7718 if (pd.act.flags & PFSTATE_SETPRIO) { 7719 if (pd.tos & IPTOS_LOWDELAY) 7720 use_2nd_queue = 1; 7721 if (vlan_set_pcp(m, pd.act.set_prio[use_2nd_queue])) { 7722 action = PF_DROP; 7723 REASON_SET(&reason, PFRES_MEMORY); 7724 pd.act.log = PF_LOG_FORCE; 7725 DPFPRINTF(PF_DEBUG_MISC, 7726 ("pf: failed to allocate 802.1q mtag\n")); 7727 } 7728 } 7729 7730 #ifdef ALTQ 7731 if (action == PF_PASS && pd.act.qid) { 7732 if (pd.pf_mtag == NULL && 7733 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 7734 action = PF_DROP; 7735 REASON_SET(&reason, PFRES_MEMORY); 7736 } else { 7737 if (s != NULL) 7738 pd.pf_mtag->qid_hash = pf_state_hash(s); 7739 if (use_2nd_queue || (pd.tos & IPTOS_LOWDELAY)) 7740 pd.pf_mtag->qid = pd.act.pqid; 7741 else 7742 pd.pf_mtag->qid = pd.act.qid; 7743 /* Add hints for ecn. */ 7744 pd.pf_mtag->hdr = h; 7745 } 7746 } 7747 #endif /* ALTQ */ 7748 7749 /* 7750 * connections redirected to loopback should not match sockets 7751 * bound specifically to loopback due to security implications, 7752 * see tcp_input() and in_pcblookup_listen(). 7753 */ 7754 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7755 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7756 (s->nat_rule.ptr->action == PF_RDR || 7757 s->nat_rule.ptr->action == PF_BINAT) && 7758 IN_LOOPBACK(ntohl(pd.dst->v4.s_addr))) 7759 m->m_flags |= M_SKIP_FIREWALL; 7760 7761 if (__predict_false(ip_divert_ptr != NULL) && action == PF_PASS && 7762 r->divert.port && !PACKET_LOOPED(&pd)) { 7763 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 7764 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 7765 if (ipfwtag != NULL) { 7766 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 7767 ntohs(r->divert.port); 7768 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 7769 7770 if (s) 7771 PF_STATE_UNLOCK(s); 7772 7773 m_tag_prepend(m, ipfwtag); 7774 if (m->m_flags & M_FASTFWD_OURS) { 7775 if (pd.pf_mtag == NULL && 7776 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 7777 action = PF_DROP; 7778 REASON_SET(&reason, PFRES_MEMORY); 7779 pd.act.log = PF_LOG_FORCE; 7780 DPFPRINTF(PF_DEBUG_MISC, 7781 ("pf: failed to allocate tag\n")); 7782 } else { 7783 pd.pf_mtag->flags |= 7784 PF_MTAG_FLAG_FASTFWD_OURS_PRESENT; 7785 m->m_flags &= ~M_FASTFWD_OURS; 7786 } 7787 } 7788 ip_divert_ptr(*m0, dir == PF_IN); 7789 *m0 = NULL; 7790 7791 return (action); 7792 } else { 7793 /* XXX: ipfw has the same behaviour! */ 7794 action = PF_DROP; 7795 REASON_SET(&reason, PFRES_MEMORY); 7796 pd.act.log = PF_LOG_FORCE; 7797 DPFPRINTF(PF_DEBUG_MISC, 7798 ("pf: failed to allocate divert tag\n")); 7799 } 7800 } 7801 7802 if (pd.act.log) { 7803 struct pf_krule *lr; 7804 struct pf_krule_item *ri; 7805 7806 if (s != NULL && s->nat_rule.ptr != NULL && 7807 s->nat_rule.ptr->log & PF_LOG_ALL) 7808 lr = s->nat_rule.ptr; 7809 else 7810 lr = r; 7811 7812 if (pd.act.log & PF_LOG_FORCE || lr->log & PF_LOG_ALL) 7813 PFLOG_PACKET(kif, m, AF_INET, reason, lr, a, ruleset, 7814 &pd, (s == NULL)); 7815 if (s) { 7816 SLIST_FOREACH(ri, &s->match_rules, entry) 7817 if (ri->r->log & PF_LOG_ALL) 7818 PFLOG_PACKET(kif, m, AF_INET, reason, 7819 ri->r, a, ruleset, &pd, 0); 7820 } 7821 } 7822 7823 pf_counter_u64_critical_enter(); 7824 pf_counter_u64_add_protected(&kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS], 7825 pd.tot_len); 7826 pf_counter_u64_add_protected(&kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS], 7827 1); 7828 7829 if (action == PF_PASS || r->action == PF_DROP) { 7830 dirndx = (dir == PF_OUT); 7831 pf_counter_u64_add_protected(&r->packets[dirndx], 1); 7832 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); 7833 pf_update_timestamp(r); 7834 7835 if (a != NULL) { 7836 pf_counter_u64_add_protected(&a->packets[dirndx], 1); 7837 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); 7838 } 7839 if (s != NULL) { 7840 struct pf_krule_item *ri; 7841 7842 if (s->nat_rule.ptr != NULL) { 7843 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 7844 1); 7845 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], 7846 pd.tot_len); 7847 } 7848 if (s->src_node != NULL) { 7849 counter_u64_add(s->src_node->packets[dirndx], 7850 1); 7851 counter_u64_add(s->src_node->bytes[dirndx], 7852 pd.tot_len); 7853 } 7854 if (s->nat_src_node != NULL) { 7855 counter_u64_add(s->nat_src_node->packets[dirndx], 7856 1); 7857 counter_u64_add(s->nat_src_node->bytes[dirndx], 7858 pd.tot_len); 7859 } 7860 dirndx = (dir == s->direction) ? 0 : 1; 7861 s->packets[dirndx]++; 7862 s->bytes[dirndx] += pd.tot_len; 7863 SLIST_FOREACH(ri, &s->match_rules, entry) { 7864 pf_counter_u64_add_protected(&ri->r->packets[dirndx], 1); 7865 pf_counter_u64_add_protected(&ri->r->bytes[dirndx], pd.tot_len); 7866 } 7867 } 7868 tr = r; 7869 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7870 if (nr != NULL && r == &V_pf_default_rule) 7871 tr = nr; 7872 if (tr->src.addr.type == PF_ADDR_TABLE) 7873 pfr_update_stats(tr->src.addr.p.tbl, 7874 (s == NULL) ? pd.src : 7875 &s->key[(s->direction == PF_IN)]-> 7876 addr[(s->direction == PF_OUT)], 7877 pd.af, pd.tot_len, dir == PF_OUT, 7878 r->action == PF_PASS, tr->src.neg); 7879 if (tr->dst.addr.type == PF_ADDR_TABLE) 7880 pfr_update_stats(tr->dst.addr.p.tbl, 7881 (s == NULL) ? pd.dst : 7882 &s->key[(s->direction == PF_IN)]-> 7883 addr[(s->direction == PF_IN)], 7884 pd.af, pd.tot_len, dir == PF_OUT, 7885 r->action == PF_PASS, tr->dst.neg); 7886 } 7887 pf_counter_u64_critical_exit(); 7888 7889 switch (action) { 7890 case PF_SYNPROXY_DROP: 7891 m_freem(*m0); 7892 case PF_DEFER: 7893 *m0 = NULL; 7894 action = PF_PASS; 7895 break; 7896 case PF_DROP: 7897 m_freem(*m0); 7898 *m0 = NULL; 7899 break; 7900 default: 7901 /* pf_route() returns unlocked. */ 7902 if (rt) { 7903 pf_route(m0, r, kif->pfik_ifp, s, &pd, inp); 7904 return (action); 7905 } 7906 if (pf_dummynet(&pd, s, r, m0) != 0) { 7907 action = PF_DROP; 7908 REASON_SET(&reason, PFRES_MEMORY); 7909 } 7910 break; 7911 } 7912 7913 SDT_PROBE4(pf, ip, test, done, action, reason, r, s); 7914 7915 if (s) 7916 PF_STATE_UNLOCK(s); 7917 7918 return (action); 7919 } 7920 #endif /* INET */ 7921 7922 #ifdef INET6 7923 int 7924 pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp, 7925 struct pf_rule_actions *default_actions) 7926 { 7927 struct pfi_kkif *kif; 7928 u_short action, reason = 0; 7929 struct mbuf *m = *m0, *n = NULL; 7930 struct m_tag *mtag; 7931 struct ip6_hdr *h = NULL; 7932 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 7933 struct pf_kstate *s = NULL; 7934 struct pf_kruleset *ruleset = NULL; 7935 struct pf_pdesc pd; 7936 int off, terminal = 0, dirndx, rh_cnt = 0, use_2nd_queue = 0; 7937 uint16_t tag; 7938 uint8_t rt; 7939 7940 PF_RULES_RLOCK_TRACKER; 7941 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); 7942 M_ASSERTPKTHDR(m); 7943 7944 if (!V_pf_status.running) 7945 return (PF_PASS); 7946 7947 PF_RULES_RLOCK(); 7948 7949 kif = (struct pfi_kkif *)ifp->if_pf_kif; 7950 if (__predict_false(kif == NULL)) { 7951 DPFPRINTF(PF_DEBUG_URGENT, 7952 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 7953 PF_RULES_RUNLOCK(); 7954 return (PF_DROP); 7955 } 7956 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 7957 PF_RULES_RUNLOCK(); 7958 return (PF_PASS); 7959 } 7960 7961 if (m->m_flags & M_SKIP_FIREWALL) { 7962 PF_RULES_RUNLOCK(); 7963 return (PF_PASS); 7964 } 7965 7966 memset(&pd, 0, sizeof(pd)); 7967 if (default_actions != NULL) 7968 memcpy(&pd.act, default_actions, sizeof(pd.act)); 7969 pd.pf_mtag = pf_find_mtag(m); 7970 7971 if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_MTAG_FLAG_ROUTE_TO)) { 7972 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 7973 7974 ifp = ifnet_byindexgen(pd.pf_mtag->if_index, 7975 pd.pf_mtag->if_idxgen); 7976 if (ifp == NULL || ifp->if_flags & IFF_DYING) { 7977 PF_RULES_RUNLOCK(); 7978 m_freem(*m0); 7979 *m0 = NULL; 7980 return (PF_PASS); 7981 } 7982 PF_RULES_RUNLOCK(); 7983 nd6_output_ifp(ifp, ifp, m, 7984 (struct sockaddr_in6 *)&pd.pf_mtag->dst, NULL); 7985 *m0 = NULL; 7986 return (PF_PASS); 7987 } 7988 7989 if (pd.pf_mtag && pd.pf_mtag->dnpipe) { 7990 pd.act.dnpipe = pd.pf_mtag->dnpipe; 7991 pd.act.flags = pd.pf_mtag->dnflags; 7992 } 7993 7994 if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL && 7995 pd.pf_mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 7996 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 7997 /* Dummynet re-injects packets after they've 7998 * completed their delay. We've already 7999 * processed them, so pass unconditionally. */ 8000 PF_RULES_RUNLOCK(); 8001 return (PF_PASS); 8002 } 8003 8004 pd.sport = pd.dport = NULL; 8005 pd.ip_sum = NULL; 8006 pd.proto_sum = NULL; 8007 pd.dir = dir; 8008 pd.sidx = (dir == PF_IN) ? 0 : 1; 8009 pd.didx = (dir == PF_IN) ? 1 : 0; 8010 pd.af = AF_INET6; 8011 pd.act.rtableid = -1; 8012 8013 /* We do IP header normalization and packet reassembly here */ 8014 if (pf_normalize_ip6(m0, kif, &reason, &pd) != PF_PASS) { 8015 action = PF_DROP; 8016 goto done; 8017 } 8018 m = *m0; /* pf_normalize messes with m0 */ 8019 h = mtod(m, struct ip6_hdr *); 8020 8021 /* 8022 * we do not support jumbogram. if we keep going, zero ip6_plen 8023 * will do something bad, so drop the packet for now. 8024 */ 8025 if (htons(h->ip6_plen) == 0) { 8026 action = PF_DROP; 8027 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 8028 goto done; 8029 } 8030 8031 pd.src = (struct pf_addr *)&h->ip6_src; 8032 pd.dst = (struct pf_addr *)&h->ip6_dst; 8033 pd.tos = IPV6_DSCP(h); 8034 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 8035 8036 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 8037 pd.proto = h->ip6_nxt; 8038 do { 8039 switch (pd.proto) { 8040 case IPPROTO_FRAGMENT: 8041 action = pf_test_fragment(&r, kif, m, h, &pd, &a, 8042 &ruleset); 8043 if (action == PF_DROP) 8044 REASON_SET(&reason, PFRES_FRAG); 8045 goto done; 8046 case IPPROTO_ROUTING: { 8047 struct ip6_rthdr rthdr; 8048 8049 if (rh_cnt++) { 8050 DPFPRINTF(PF_DEBUG_MISC, 8051 ("pf: IPv6 more than one rthdr\n")); 8052 action = PF_DROP; 8053 REASON_SET(&reason, PFRES_IPOPTIONS); 8054 pd.act.log = PF_LOG_FORCE; 8055 goto done; 8056 } 8057 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 8058 &reason, pd.af)) { 8059 DPFPRINTF(PF_DEBUG_MISC, 8060 ("pf: IPv6 short rthdr\n")); 8061 action = PF_DROP; 8062 REASON_SET(&reason, PFRES_SHORT); 8063 pd.act.log = PF_LOG_FORCE; 8064 goto done; 8065 } 8066 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 8067 DPFPRINTF(PF_DEBUG_MISC, 8068 ("pf: IPv6 rthdr0\n")); 8069 action = PF_DROP; 8070 REASON_SET(&reason, PFRES_IPOPTIONS); 8071 pd.act.log = PF_LOG_FORCE; 8072 goto done; 8073 } 8074 /* FALLTHROUGH */ 8075 } 8076 case IPPROTO_AH: 8077 case IPPROTO_HOPOPTS: 8078 case IPPROTO_DSTOPTS: { 8079 /* get next header and header length */ 8080 struct ip6_ext opt6; 8081 8082 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 8083 NULL, &reason, pd.af)) { 8084 DPFPRINTF(PF_DEBUG_MISC, 8085 ("pf: IPv6 short opt\n")); 8086 action = PF_DROP; 8087 pd.act.log = PF_LOG_FORCE; 8088 goto done; 8089 } 8090 if (pd.proto == IPPROTO_AH) 8091 off += (opt6.ip6e_len + 2) * 4; 8092 else 8093 off += (opt6.ip6e_len + 1) * 8; 8094 pd.proto = opt6.ip6e_nxt; 8095 /* goto the next header */ 8096 break; 8097 } 8098 default: 8099 terminal++; 8100 break; 8101 } 8102 } while (!terminal); 8103 8104 /* if there's no routing header, use unmodified mbuf for checksumming */ 8105 if (!n) 8106 n = m; 8107 8108 switch (pd.proto) { 8109 case IPPROTO_TCP: { 8110 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), 8111 &action, &reason, AF_INET6)) { 8112 if (action != PF_PASS) 8113 pd.act.log |= PF_LOG_FORCE; 8114 goto done; 8115 } 8116 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); 8117 pd.sport = &pd.hdr.tcp.th_sport; 8118 pd.dport = &pd.hdr.tcp.th_dport; 8119 action = pf_normalize_tcp(kif, m, 0, off, h, &pd); 8120 if (action == PF_DROP) 8121 goto done; 8122 action = pf_test_state_tcp(&s, kif, m, off, h, &pd, &reason); 8123 if (action == PF_PASS) { 8124 if (V_pfsync_update_state_ptr != NULL) 8125 V_pfsync_update_state_ptr(s); 8126 r = s->rule.ptr; 8127 a = s->anchor.ptr; 8128 } else if (s == NULL) 8129 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8130 &a, &ruleset, inp); 8131 break; 8132 } 8133 8134 case IPPROTO_UDP: { 8135 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), 8136 &action, &reason, AF_INET6)) { 8137 if (action != PF_PASS) 8138 pd.act.log |= PF_LOG_FORCE; 8139 goto done; 8140 } 8141 pd.sport = &pd.hdr.udp.uh_sport; 8142 pd.dport = &pd.hdr.udp.uh_dport; 8143 if (pd.hdr.udp.uh_dport == 0 || 8144 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || 8145 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { 8146 action = PF_DROP; 8147 REASON_SET(&reason, PFRES_SHORT); 8148 goto done; 8149 } 8150 action = pf_test_state_udp(&s, kif, m, off, h, &pd); 8151 if (action == PF_PASS) { 8152 if (V_pfsync_update_state_ptr != NULL) 8153 V_pfsync_update_state_ptr(s); 8154 r = s->rule.ptr; 8155 a = s->anchor.ptr; 8156 } else if (s == NULL) 8157 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8158 &a, &ruleset, inp); 8159 break; 8160 } 8161 8162 case IPPROTO_SCTP: { 8163 if (!pf_pull_hdr(m, off, &pd.hdr.sctp, sizeof(pd.hdr.sctp), 8164 &action, &reason, AF_INET6)) { 8165 if (action != PF_PASS) 8166 pd.act.log |= PF_LOG_FORCE; 8167 goto done; 8168 } 8169 pd.sport = &pd.hdr.sctp.src_port; 8170 pd.dport = &pd.hdr.sctp.dest_port; 8171 if (pd.hdr.sctp.src_port == 0 || pd.hdr.sctp.dest_port == 0) { 8172 action = PF_DROP; 8173 REASON_SET(&reason, PFRES_SHORT); 8174 goto done; 8175 } 8176 action = pf_normalize_sctp(dir, kif, m, 0, off, h, &pd); 8177 if (action == PF_DROP) 8178 goto done; 8179 action = pf_test_state_sctp(&s, kif, m, off, h, &pd, 8180 &reason); 8181 if (action == PF_PASS) { 8182 if (V_pfsync_update_state_ptr != NULL) 8183 V_pfsync_update_state_ptr(s); 8184 r = s->rule.ptr; 8185 a = s->anchor.ptr; 8186 } else { 8187 action = pf_test_rule(&r, &s, kif, m, off, 8188 &pd, &a, &ruleset, inp); 8189 } 8190 break; 8191 } 8192 8193 case IPPROTO_ICMP: { 8194 action = PF_DROP; 8195 DPFPRINTF(PF_DEBUG_MISC, 8196 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 8197 goto done; 8198 } 8199 8200 case IPPROTO_ICMPV6: { 8201 if (!pf_pull_hdr(m, off, &pd.hdr.icmp6, sizeof(pd.hdr.icmp6), 8202 &action, &reason, AF_INET6)) { 8203 if (action != PF_PASS) 8204 pd.act.log |= PF_LOG_FORCE; 8205 goto done; 8206 } 8207 action = pf_test_state_icmp(&s, kif, m, off, h, &pd, &reason); 8208 if (action == PF_PASS) { 8209 if (V_pfsync_update_state_ptr != NULL) 8210 V_pfsync_update_state_ptr(s); 8211 r = s->rule.ptr; 8212 a = s->anchor.ptr; 8213 } else if (s == NULL) 8214 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8215 &a, &ruleset, inp); 8216 break; 8217 } 8218 8219 default: 8220 action = pf_test_state_other(&s, kif, m, &pd); 8221 if (action == PF_PASS) { 8222 if (V_pfsync_update_state_ptr != NULL) 8223 V_pfsync_update_state_ptr(s); 8224 r = s->rule.ptr; 8225 a = s->anchor.ptr; 8226 } else if (s == NULL) 8227 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8228 &a, &ruleset, inp); 8229 break; 8230 } 8231 8232 done: 8233 PF_RULES_RUNLOCK(); 8234 if (n != m) { 8235 m_freem(n); 8236 n = NULL; 8237 } 8238 8239 /* handle dangerous IPv6 extension headers. */ 8240 if (action == PF_PASS && rh_cnt && 8241 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 8242 action = PF_DROP; 8243 REASON_SET(&reason, PFRES_IPOPTIONS); 8244 pd.act.log = r->log; 8245 DPFPRINTF(PF_DEBUG_MISC, 8246 ("pf: dropping packet with dangerous v6 headers\n")); 8247 } 8248 8249 if (s) { 8250 memcpy(&pd.act, &s->act, sizeof(struct pf_rule_actions)); 8251 tag = s->tag; 8252 rt = s->rt; 8253 } else { 8254 tag = r->tag; 8255 rt = r->rt; 8256 } 8257 8258 if (tag > 0 && pf_tag_packet(m, &pd, tag)) { 8259 action = PF_DROP; 8260 REASON_SET(&reason, PFRES_MEMORY); 8261 } 8262 8263 pf_scrub_ip6(&m, &pd); 8264 if (pd.proto == IPPROTO_TCP && pd.act.max_mss) 8265 pf_normalize_mss(m, off, &pd); 8266 8267 if (pd.act.rtableid >= 0) 8268 M_SETFIB(m, pd.act.rtableid); 8269 8270 if (pd.act.flags & PFSTATE_SETPRIO) { 8271 if (pd.tos & IPTOS_LOWDELAY) 8272 use_2nd_queue = 1; 8273 if (vlan_set_pcp(m, pd.act.set_prio[use_2nd_queue])) { 8274 action = PF_DROP; 8275 REASON_SET(&reason, PFRES_MEMORY); 8276 pd.act.log = PF_LOG_FORCE; 8277 DPFPRINTF(PF_DEBUG_MISC, 8278 ("pf: failed to allocate 802.1q mtag\n")); 8279 } 8280 } 8281 8282 #ifdef ALTQ 8283 if (action == PF_PASS && pd.act.qid) { 8284 if (pd.pf_mtag == NULL && 8285 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 8286 action = PF_DROP; 8287 REASON_SET(&reason, PFRES_MEMORY); 8288 } else { 8289 if (s != NULL) 8290 pd.pf_mtag->qid_hash = pf_state_hash(s); 8291 if (pd.tos & IPTOS_LOWDELAY) 8292 pd.pf_mtag->qid = pd.act.pqid; 8293 else 8294 pd.pf_mtag->qid = pd.act.qid; 8295 /* Add hints for ecn. */ 8296 pd.pf_mtag->hdr = h; 8297 } 8298 } 8299 #endif /* ALTQ */ 8300 8301 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 8302 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 8303 (s->nat_rule.ptr->action == PF_RDR || 8304 s->nat_rule.ptr->action == PF_BINAT) && 8305 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 8306 m->m_flags |= M_SKIP_FIREWALL; 8307 8308 /* XXX: Anybody working on it?! */ 8309 if (r->divert.port) 8310 printf("pf: divert(9) is not supported for IPv6\n"); 8311 8312 if (pd.act.log) { 8313 struct pf_krule *lr; 8314 struct pf_krule_item *ri; 8315 8316 if (s != NULL && s->nat_rule.ptr != NULL && 8317 s->nat_rule.ptr->log & PF_LOG_ALL) 8318 lr = s->nat_rule.ptr; 8319 else 8320 lr = r; 8321 8322 if (pd.act.log & PF_LOG_FORCE || lr->log & PF_LOG_ALL) 8323 PFLOG_PACKET(kif, m, AF_INET6, reason, lr, a, ruleset, 8324 &pd, (s == NULL)); 8325 if (s) { 8326 SLIST_FOREACH(ri, &s->match_rules, entry) 8327 if (ri->r->log & PF_LOG_ALL) 8328 PFLOG_PACKET(kif, m, AF_INET6, reason, 8329 ri->r, a, ruleset, &pd, 0); 8330 } 8331 } 8332 8333 pf_counter_u64_critical_enter(); 8334 pf_counter_u64_add_protected(&kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS], 8335 pd.tot_len); 8336 pf_counter_u64_add_protected(&kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS], 8337 1); 8338 8339 if (action == PF_PASS || r->action == PF_DROP) { 8340 dirndx = (dir == PF_OUT); 8341 pf_counter_u64_add_protected(&r->packets[dirndx], 1); 8342 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); 8343 if (a != NULL) { 8344 pf_counter_u64_add_protected(&a->packets[dirndx], 1); 8345 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); 8346 } 8347 if (s != NULL) { 8348 if (s->nat_rule.ptr != NULL) { 8349 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 8350 1); 8351 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], 8352 pd.tot_len); 8353 } 8354 if (s->src_node != NULL) { 8355 counter_u64_add(s->src_node->packets[dirndx], 8356 1); 8357 counter_u64_add(s->src_node->bytes[dirndx], 8358 pd.tot_len); 8359 } 8360 if (s->nat_src_node != NULL) { 8361 counter_u64_add(s->nat_src_node->packets[dirndx], 8362 1); 8363 counter_u64_add(s->nat_src_node->bytes[dirndx], 8364 pd.tot_len); 8365 } 8366 dirndx = (dir == s->direction) ? 0 : 1; 8367 s->packets[dirndx]++; 8368 s->bytes[dirndx] += pd.tot_len; 8369 } 8370 tr = r; 8371 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 8372 if (nr != NULL && r == &V_pf_default_rule) 8373 tr = nr; 8374 if (tr->src.addr.type == PF_ADDR_TABLE) 8375 pfr_update_stats(tr->src.addr.p.tbl, 8376 (s == NULL) ? pd.src : 8377 &s->key[(s->direction == PF_IN)]->addr[0], 8378 pd.af, pd.tot_len, dir == PF_OUT, 8379 r->action == PF_PASS, tr->src.neg); 8380 if (tr->dst.addr.type == PF_ADDR_TABLE) 8381 pfr_update_stats(tr->dst.addr.p.tbl, 8382 (s == NULL) ? pd.dst : 8383 &s->key[(s->direction == PF_IN)]->addr[1], 8384 pd.af, pd.tot_len, dir == PF_OUT, 8385 r->action == PF_PASS, tr->dst.neg); 8386 } 8387 pf_counter_u64_critical_exit(); 8388 8389 switch (action) { 8390 case PF_SYNPROXY_DROP: 8391 m_freem(*m0); 8392 case PF_DEFER: 8393 *m0 = NULL; 8394 action = PF_PASS; 8395 break; 8396 case PF_DROP: 8397 m_freem(*m0); 8398 *m0 = NULL; 8399 break; 8400 default: 8401 /* pf_route6() returns unlocked. */ 8402 if (rt) { 8403 pf_route6(m0, r, kif->pfik_ifp, s, &pd, inp); 8404 return (action); 8405 } 8406 if (pf_dummynet(&pd, s, r, m0) != 0) { 8407 action = PF_DROP; 8408 REASON_SET(&reason, PFRES_MEMORY); 8409 } 8410 break; 8411 } 8412 8413 if (s) 8414 PF_STATE_UNLOCK(s); 8415 8416 /* If reassembled packet passed, create new fragments. */ 8417 if (action == PF_PASS && *m0 && dir == PF_OUT && 8418 (mtag = m_tag_find(m, PACKET_TAG_PF_REASSEMBLED, NULL)) != NULL) 8419 action = pf_refragment6(ifp, m0, mtag, pflags & PFIL_FWD); 8420 8421 SDT_PROBE4(pf, ip, test6, done, action, reason, r, s); 8422 8423 return (action); 8424 } 8425 #endif /* INET6 */ 8426