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 #include "opt_bpf.h" 42 #include "opt_inet.h" 43 #include "opt_inet6.h" 44 #include "opt_pf.h" 45 #include "opt_sctp.h" 46 47 #include <sys/param.h> 48 #include <sys/bus.h> 49 #include <sys/endian.h> 50 #include <sys/gsb_crc32.h> 51 #include <sys/hash.h> 52 #include <sys/interrupt.h> 53 #include <sys/kernel.h> 54 #include <sys/kthread.h> 55 #include <sys/limits.h> 56 #include <sys/mbuf.h> 57 #include <sys/md5.h> 58 #include <sys/random.h> 59 #include <sys/refcount.h> 60 #include <sys/sdt.h> 61 #include <sys/socket.h> 62 #include <sys/sysctl.h> 63 #include <sys/taskqueue.h> 64 #include <sys/ucred.h> 65 66 #include <net/if.h> 67 #include <net/if_var.h> 68 #include <net/if_private.h> 69 #include <net/if_types.h> 70 #include <net/if_vlan_var.h> 71 #include <net/route.h> 72 #include <net/route/nhop.h> 73 #include <net/vnet.h> 74 75 #include <net/pfil.h> 76 #include <net/pfvar.h> 77 #include <net/if_pflog.h> 78 #include <net/if_pfsync.h> 79 80 #include <netinet/in_pcb.h> 81 #include <netinet/in_var.h> 82 #include <netinet/in_fib.h> 83 #include <netinet/ip.h> 84 #include <netinet/ip_fw.h> 85 #include <netinet/ip_icmp.h> 86 #include <netinet/icmp_var.h> 87 #include <netinet/ip_var.h> 88 #include <netinet/tcp.h> 89 #include <netinet/tcp_fsm.h> 90 #include <netinet/tcp_seq.h> 91 #include <netinet/tcp_timer.h> 92 #include <netinet/tcp_var.h> 93 #include <netinet/udp.h> 94 #include <netinet/udp_var.h> 95 96 /* dummynet */ 97 #include <netinet/ip_dummynet.h> 98 #include <netinet/ip_fw.h> 99 #include <netpfil/ipfw/dn_heap.h> 100 #include <netpfil/ipfw/ip_fw_private.h> 101 #include <netpfil/ipfw/ip_dn_private.h> 102 103 #ifdef INET6 104 #include <netinet/ip6.h> 105 #include <netinet/icmp6.h> 106 #include <netinet6/nd6.h> 107 #include <netinet6/ip6_var.h> 108 #include <netinet6/in6_pcb.h> 109 #include <netinet6/in6_fib.h> 110 #include <netinet6/scope6_var.h> 111 #endif /* INET6 */ 112 113 #include <netinet/sctp_header.h> 114 #include <netinet/sctp_crc32.h> 115 116 #include <machine/in_cksum.h> 117 #include <security/mac/mac_framework.h> 118 119 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 120 121 SDT_PROVIDER_DEFINE(pf); 122 SDT_PROBE_DEFINE4(pf, ip, test, done, "int", "int", "struct pf_krule *", 123 "struct pf_kstate *"); 124 SDT_PROBE_DEFINE4(pf, ip, test6, done, "int", "int", "struct pf_krule *", 125 "struct pf_kstate *"); 126 SDT_PROBE_DEFINE5(pf, ip, state, lookup, "struct pfi_kkif *", 127 "struct pf_state_key_cmp *", "int", "struct pf_pdesc *", 128 "struct pf_kstate *"); 129 SDT_PROBE_DEFINE4(pf, sctp, multihome, test, "struct pfi_kkif *", 130 "struct pf_krule *", "struct mbuf *", "int"); 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 void pf_sctp_multihome_delayed(struct pf_pdesc *, int, 313 struct pfi_kkif *, struct pf_kstate *); 314 static int pf_test_state_sctp(struct pf_kstate **, 315 struct pfi_kkif *, struct mbuf *, int, 316 void *, struct pf_pdesc *, u_short *); 317 static int pf_test_state_other(struct pf_kstate **, 318 struct pfi_kkif *, struct mbuf *, struct pf_pdesc *); 319 static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 320 int, u_int16_t); 321 static int pf_check_proto_cksum(struct mbuf *, int, int, 322 u_int8_t, sa_family_t); 323 static void pf_print_state_parts(struct pf_kstate *, 324 struct pf_state_key *, struct pf_state_key *); 325 static void pf_patch_8(struct mbuf *, u_int16_t *, u_int8_t *, u_int8_t, 326 bool, u_int8_t); 327 static struct pf_kstate *pf_find_state(struct pfi_kkif *, 328 struct pf_state_key_cmp *, u_int); 329 static int pf_src_connlimit(struct pf_kstate **); 330 static void pf_overload_task(void *v, int pending); 331 static u_short pf_insert_src_node(struct pf_ksrc_node **, 332 struct pf_krule *, struct pf_addr *, sa_family_t); 333 static u_int pf_purge_expired_states(u_int, int); 334 static void pf_purge_unlinked_rules(void); 335 static int pf_mtag_uminit(void *, int, int); 336 static void pf_mtag_free(struct m_tag *); 337 static void pf_packet_rework_nat(struct mbuf *, struct pf_pdesc *, 338 int, struct pf_state_key *); 339 #ifdef INET 340 static void pf_route(struct mbuf **, struct pf_krule *, 341 struct ifnet *, struct pf_kstate *, 342 struct pf_pdesc *, struct inpcb *); 343 #endif /* INET */ 344 #ifdef INET6 345 static void pf_change_a6(struct pf_addr *, u_int16_t *, 346 struct pf_addr *, u_int8_t); 347 static void pf_route6(struct mbuf **, struct pf_krule *, 348 struct ifnet *, struct pf_kstate *, 349 struct pf_pdesc *, struct inpcb *); 350 #endif /* INET6 */ 351 static __inline void pf_set_protostate(struct pf_kstate *, int, u_int8_t); 352 353 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 354 355 extern int pf_end_threads; 356 extern struct proc *pf_purge_proc; 357 358 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 359 360 #define PACKET_UNDO_NAT(_m, _pd, _off, _s) \ 361 do { \ 362 struct pf_state_key *nk; \ 363 if ((pd->dir) == PF_OUT) \ 364 nk = (_s)->key[PF_SK_STACK]; \ 365 else \ 366 nk = (_s)->key[PF_SK_WIRE]; \ 367 pf_packet_rework_nat(_m, _pd, _off, nk); \ 368 } while (0) 369 370 #define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 371 (pd)->pf_mtag->flags & PF_MTAG_FLAG_PACKET_LOOPED) 372 373 #define STATE_LOOKUP(i, k, s, pd) \ 374 do { \ 375 (s) = pf_find_state((i), (k), (pd->dir)); \ 376 SDT_PROBE5(pf, ip, state, lookup, i, k, (pd->dir), pd, (s)); \ 377 if ((s) == NULL) \ 378 return (PF_DROP); \ 379 if (PACKET_LOOPED(pd)) \ 380 return (PF_PASS); \ 381 } while (0) 382 383 #define BOUND_IFACE(r, k) \ 384 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all 385 386 #define STATE_INC_COUNTERS(s) \ 387 do { \ 388 struct pf_krule_item *mrm; \ 389 counter_u64_add(s->rule.ptr->states_cur, 1); \ 390 counter_u64_add(s->rule.ptr->states_tot, 1); \ 391 if (s->anchor.ptr != NULL) { \ 392 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 393 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 394 } \ 395 if (s->nat_rule.ptr != NULL) { \ 396 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 397 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 398 } \ 399 SLIST_FOREACH(mrm, &s->match_rules, entry) { \ 400 counter_u64_add(mrm->r->states_cur, 1); \ 401 counter_u64_add(mrm->r->states_tot, 1); \ 402 } \ 403 } while (0) 404 405 #define STATE_DEC_COUNTERS(s) \ 406 do { \ 407 struct pf_krule_item *mrm; \ 408 if (s->nat_rule.ptr != NULL) \ 409 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 410 if (s->anchor.ptr != NULL) \ 411 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 412 counter_u64_add(s->rule.ptr->states_cur, -1); \ 413 SLIST_FOREACH(mrm, &s->match_rules, entry) \ 414 counter_u64_add(mrm->r->states_cur, -1); \ 415 } while (0) 416 417 MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 418 MALLOC_DEFINE(M_PF_RULE_ITEM, "pf_krule_item", "pf(4) rule items"); 419 VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 420 VNET_DEFINE(struct pf_idhash *, pf_idhash); 421 VNET_DEFINE(struct pf_srchash *, pf_srchash); 422 423 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 424 "pf(4)"); 425 426 u_long pf_hashmask; 427 u_long pf_srchashmask; 428 static u_long pf_hashsize; 429 static u_long pf_srchashsize; 430 u_long pf_ioctl_maxcount = 65535; 431 432 SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 433 &pf_hashsize, 0, "Size of pf(4) states hashtable"); 434 SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 435 &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable"); 436 SYSCTL_ULONG(_net_pf, OID_AUTO, request_maxcount, CTLFLAG_RWTUN, 437 &pf_ioctl_maxcount, 0, "Maximum number of tables, addresses, ... in a single ioctl() call"); 438 439 VNET_DEFINE(void *, pf_swi_cookie); 440 VNET_DEFINE(struct intr_event *, pf_swi_ie); 441 442 VNET_DEFINE(uint32_t, pf_hashseed); 443 #define V_pf_hashseed VNET(pf_hashseed) 444 445 static void 446 pf_sctp_checksum(struct mbuf *m, int off) 447 { 448 uint32_t sum = 0; 449 450 /* Zero out the checksum, to enable recalculation. */ 451 m_copyback(m, off + offsetof(struct sctphdr, checksum), 452 sizeof(sum), (caddr_t)&sum); 453 454 sum = sctp_calculate_cksum(m, off); 455 456 m_copyback(m, off + offsetof(struct sctphdr, checksum), 457 sizeof(sum), (caddr_t)&sum); 458 } 459 460 int 461 pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af) 462 { 463 464 switch (af) { 465 #ifdef INET 466 case AF_INET: 467 if (a->addr32[0] > b->addr32[0]) 468 return (1); 469 if (a->addr32[0] < b->addr32[0]) 470 return (-1); 471 break; 472 #endif /* INET */ 473 #ifdef INET6 474 case AF_INET6: 475 if (a->addr32[3] > b->addr32[3]) 476 return (1); 477 if (a->addr32[3] < b->addr32[3]) 478 return (-1); 479 if (a->addr32[2] > b->addr32[2]) 480 return (1); 481 if (a->addr32[2] < b->addr32[2]) 482 return (-1); 483 if (a->addr32[1] > b->addr32[1]) 484 return (1); 485 if (a->addr32[1] < b->addr32[1]) 486 return (-1); 487 if (a->addr32[0] > b->addr32[0]) 488 return (1); 489 if (a->addr32[0] < b->addr32[0]) 490 return (-1); 491 break; 492 #endif /* INET6 */ 493 default: 494 panic("%s: unknown address family %u", __func__, af); 495 } 496 return (0); 497 } 498 499 static void 500 pf_packet_rework_nat(struct mbuf *m, struct pf_pdesc *pd, int off, 501 struct pf_state_key *nk) 502 { 503 504 switch (pd->proto) { 505 case IPPROTO_TCP: { 506 struct tcphdr *th = &pd->hdr.tcp; 507 508 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) 509 pf_change_ap(m, pd->src, &th->th_sport, pd->ip_sum, 510 &th->th_sum, &nk->addr[pd->sidx], 511 nk->port[pd->sidx], 0, pd->af); 512 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) 513 pf_change_ap(m, pd->dst, &th->th_dport, pd->ip_sum, 514 &th->th_sum, &nk->addr[pd->didx], 515 nk->port[pd->didx], 0, pd->af); 516 m_copyback(m, off, sizeof(*th), (caddr_t)th); 517 break; 518 } 519 case IPPROTO_UDP: { 520 struct udphdr *uh = &pd->hdr.udp; 521 522 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) 523 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 524 &uh->uh_sum, &nk->addr[pd->sidx], 525 nk->port[pd->sidx], 1, pd->af); 526 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) 527 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 528 &uh->uh_sum, &nk->addr[pd->didx], 529 nk->port[pd->didx], 1, pd->af); 530 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 531 break; 532 } 533 case IPPROTO_SCTP: { 534 struct sctphdr *sh = &pd->hdr.sctp; 535 uint16_t checksum = 0; 536 537 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) { 538 pf_change_ap(m, pd->src, &sh->src_port, pd->ip_sum, 539 &checksum, &nk->addr[pd->sidx], 540 nk->port[pd->sidx], 1, pd->af); 541 } 542 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) { 543 pf_change_ap(m, pd->dst, &sh->dest_port, pd->ip_sum, 544 &checksum, &nk->addr[pd->didx], 545 nk->port[pd->didx], 1, pd->af); 546 } 547 548 break; 549 } 550 case IPPROTO_ICMP: { 551 struct icmp *ih = &pd->hdr.icmp; 552 553 if (nk->port[pd->sidx] != ih->icmp_id) { 554 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( 555 ih->icmp_cksum, ih->icmp_id, 556 nk->port[pd->sidx], 0); 557 ih->icmp_id = nk->port[pd->sidx]; 558 pd->sport = &ih->icmp_id; 559 560 m_copyback(m, off, ICMP_MINLEN, (caddr_t)ih); 561 } 562 /* FALLTHROUGH */ 563 } 564 default: 565 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) { 566 switch (pd->af) { 567 case AF_INET: 568 pf_change_a(&pd->src->v4.s_addr, 569 pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 570 0); 571 break; 572 case AF_INET6: 573 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 574 break; 575 } 576 } 577 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) { 578 switch (pd->af) { 579 case AF_INET: 580 pf_change_a(&pd->dst->v4.s_addr, 581 pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 582 0); 583 break; 584 case AF_INET6: 585 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 586 break; 587 } 588 } 589 break; 590 } 591 } 592 593 static __inline uint32_t 594 pf_hashkey(struct pf_state_key *sk) 595 { 596 uint32_t h; 597 598 h = murmur3_32_hash32((uint32_t *)sk, 599 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 600 V_pf_hashseed); 601 602 return (h & pf_hashmask); 603 } 604 605 static __inline uint32_t 606 pf_hashsrc(struct pf_addr *addr, sa_family_t af) 607 { 608 uint32_t h; 609 610 switch (af) { 611 case AF_INET: 612 h = murmur3_32_hash32((uint32_t *)&addr->v4, 613 sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed); 614 break; 615 case AF_INET6: 616 h = murmur3_32_hash32((uint32_t *)&addr->v6, 617 sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed); 618 break; 619 default: 620 panic("%s: unknown address family %u", __func__, af); 621 } 622 623 return (h & pf_srchashmask); 624 } 625 626 #ifdef ALTQ 627 static int 628 pf_state_hash(struct pf_kstate *s) 629 { 630 u_int32_t hv = (intptr_t)s / sizeof(*s); 631 632 hv ^= crc32(&s->src, sizeof(s->src)); 633 hv ^= crc32(&s->dst, sizeof(s->dst)); 634 if (hv == 0) 635 hv = 1; 636 return (hv); 637 } 638 #endif 639 640 static __inline void 641 pf_set_protostate(struct pf_kstate *s, int which, u_int8_t newstate) 642 { 643 if (which == PF_PEER_DST || which == PF_PEER_BOTH) 644 s->dst.state = newstate; 645 if (which == PF_PEER_DST) 646 return; 647 if (s->src.state == newstate) 648 return; 649 if (s->creatorid == V_pf_status.hostid && 650 s->key[PF_SK_STACK] != NULL && 651 s->key[PF_SK_STACK]->proto == IPPROTO_TCP && 652 !(TCPS_HAVEESTABLISHED(s->src.state) || 653 s->src.state == TCPS_CLOSED) && 654 (TCPS_HAVEESTABLISHED(newstate) || newstate == TCPS_CLOSED)) 655 atomic_add_32(&V_pf_status.states_halfopen, -1); 656 657 s->src.state = newstate; 658 } 659 660 #ifdef INET6 661 void 662 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 663 { 664 switch (af) { 665 #ifdef INET 666 case AF_INET: 667 dst->addr32[0] = src->addr32[0]; 668 break; 669 #endif /* INET */ 670 case AF_INET6: 671 dst->addr32[0] = src->addr32[0]; 672 dst->addr32[1] = src->addr32[1]; 673 dst->addr32[2] = src->addr32[2]; 674 dst->addr32[3] = src->addr32[3]; 675 break; 676 } 677 } 678 #endif /* INET6 */ 679 680 static void 681 pf_init_threshold(struct pf_threshold *threshold, 682 u_int32_t limit, u_int32_t seconds) 683 { 684 threshold->limit = limit * PF_THRESHOLD_MULT; 685 threshold->seconds = seconds; 686 threshold->count = 0; 687 threshold->last = time_uptime; 688 } 689 690 static void 691 pf_add_threshold(struct pf_threshold *threshold) 692 { 693 u_int32_t t = time_uptime, diff = t - threshold->last; 694 695 if (diff >= threshold->seconds) 696 threshold->count = 0; 697 else 698 threshold->count -= threshold->count * diff / 699 threshold->seconds; 700 threshold->count += PF_THRESHOLD_MULT; 701 threshold->last = t; 702 } 703 704 static int 705 pf_check_threshold(struct pf_threshold *threshold) 706 { 707 return (threshold->count > threshold->limit); 708 } 709 710 static int 711 pf_src_connlimit(struct pf_kstate **state) 712 { 713 struct pf_overload_entry *pfoe; 714 int bad = 0; 715 716 PF_STATE_LOCK_ASSERT(*state); 717 /* 718 * XXXKS: The src node is accessed unlocked! 719 * PF_SRC_NODE_LOCK_ASSERT((*state)->src_node); 720 */ 721 722 (*state)->src_node->conn++; 723 (*state)->src.tcp_est = 1; 724 pf_add_threshold(&(*state)->src_node->conn_rate); 725 726 if ((*state)->rule.ptr->max_src_conn && 727 (*state)->rule.ptr->max_src_conn < 728 (*state)->src_node->conn) { 729 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 730 bad++; 731 } 732 733 if ((*state)->rule.ptr->max_src_conn_rate.limit && 734 pf_check_threshold(&(*state)->src_node->conn_rate)) { 735 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 736 bad++; 737 } 738 739 if (!bad) 740 return (0); 741 742 /* Kill this state. */ 743 (*state)->timeout = PFTM_PURGE; 744 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED); 745 746 if ((*state)->rule.ptr->overload_tbl == NULL) 747 return (1); 748 749 /* Schedule overloading and flushing task. */ 750 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 751 if (pfoe == NULL) 752 return (1); /* too bad :( */ 753 754 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 755 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 756 pfoe->rule = (*state)->rule.ptr; 757 pfoe->dir = (*state)->direction; 758 PF_OVERLOADQ_LOCK(); 759 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 760 PF_OVERLOADQ_UNLOCK(); 761 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 762 763 return (1); 764 } 765 766 static void 767 pf_overload_task(void *v, int pending) 768 { 769 struct pf_overload_head queue; 770 struct pfr_addr p; 771 struct pf_overload_entry *pfoe, *pfoe1; 772 uint32_t killed = 0; 773 774 CURVNET_SET((struct vnet *)v); 775 776 PF_OVERLOADQ_LOCK(); 777 queue = V_pf_overloadqueue; 778 SLIST_INIT(&V_pf_overloadqueue); 779 PF_OVERLOADQ_UNLOCK(); 780 781 bzero(&p, sizeof(p)); 782 SLIST_FOREACH(pfoe, &queue, next) { 783 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 784 if (V_pf_status.debug >= PF_DEBUG_MISC) { 785 printf("%s: blocking address ", __func__); 786 pf_print_host(&pfoe->addr, 0, pfoe->af); 787 printf("\n"); 788 } 789 790 p.pfra_af = pfoe->af; 791 switch (pfoe->af) { 792 #ifdef INET 793 case AF_INET: 794 p.pfra_net = 32; 795 p.pfra_ip4addr = pfoe->addr.v4; 796 break; 797 #endif 798 #ifdef INET6 799 case AF_INET6: 800 p.pfra_net = 128; 801 p.pfra_ip6addr = pfoe->addr.v6; 802 break; 803 #endif 804 } 805 806 PF_RULES_WLOCK(); 807 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 808 PF_RULES_WUNLOCK(); 809 } 810 811 /* 812 * Remove those entries, that don't need flushing. 813 */ 814 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 815 if (pfoe->rule->flush == 0) { 816 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 817 free(pfoe, M_PFTEMP); 818 } else 819 counter_u64_add( 820 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 821 822 /* If nothing to flush, return. */ 823 if (SLIST_EMPTY(&queue)) { 824 CURVNET_RESTORE(); 825 return; 826 } 827 828 for (int i = 0; i <= pf_hashmask; i++) { 829 struct pf_idhash *ih = &V_pf_idhash[i]; 830 struct pf_state_key *sk; 831 struct pf_kstate *s; 832 833 PF_HASHROW_LOCK(ih); 834 LIST_FOREACH(s, &ih->states, entry) { 835 sk = s->key[PF_SK_WIRE]; 836 SLIST_FOREACH(pfoe, &queue, next) 837 if (sk->af == pfoe->af && 838 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 839 pfoe->rule == s->rule.ptr) && 840 ((pfoe->dir == PF_OUT && 841 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 842 (pfoe->dir == PF_IN && 843 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 844 s->timeout = PFTM_PURGE; 845 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED); 846 killed++; 847 } 848 } 849 PF_HASHROW_UNLOCK(ih); 850 } 851 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 852 free(pfoe, M_PFTEMP); 853 if (V_pf_status.debug >= PF_DEBUG_MISC) 854 printf("%s: %u states killed", __func__, killed); 855 856 CURVNET_RESTORE(); 857 } 858 859 /* 860 * Can return locked on failure, so that we can consistently 861 * allocate and insert a new one. 862 */ 863 struct pf_ksrc_node * 864 pf_find_src_node(struct pf_addr *src, struct pf_krule *rule, sa_family_t af, 865 struct pf_srchash **sh, bool returnlocked) 866 { 867 struct pf_ksrc_node *n; 868 869 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 870 871 *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 872 PF_HASHROW_LOCK(*sh); 873 LIST_FOREACH(n, &(*sh)->nodes, entry) 874 if (n->rule.ptr == rule && n->af == af && 875 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 876 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 877 break; 878 879 if (n != NULL) { 880 n->states++; 881 PF_HASHROW_UNLOCK(*sh); 882 } else if (returnlocked == false) 883 PF_HASHROW_UNLOCK(*sh); 884 885 return (n); 886 } 887 888 static void 889 pf_free_src_node(struct pf_ksrc_node *sn) 890 { 891 892 for (int i = 0; i < 2; i++) { 893 counter_u64_free(sn->bytes[i]); 894 counter_u64_free(sn->packets[i]); 895 } 896 uma_zfree(V_pf_sources_z, sn); 897 } 898 899 static u_short 900 pf_insert_src_node(struct pf_ksrc_node **sn, struct pf_krule *rule, 901 struct pf_addr *src, sa_family_t af) 902 { 903 u_short reason = 0; 904 struct pf_srchash *sh = NULL; 905 906 KASSERT((rule->rule_flag & PFRULE_SRCTRACK || 907 rule->rpool.opts & PF_POOL_STICKYADDR), 908 ("%s for non-tracking rule %p", __func__, rule)); 909 910 if (*sn == NULL) 911 *sn = pf_find_src_node(src, rule, af, &sh, true); 912 913 if (*sn == NULL) { 914 PF_HASHROW_ASSERT(sh); 915 916 if (rule->max_src_nodes && 917 counter_u64_fetch(rule->src_nodes) >= rule->max_src_nodes) { 918 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 1); 919 PF_HASHROW_UNLOCK(sh); 920 reason = PFRES_SRCLIMIT; 921 goto done; 922 } 923 924 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 925 if ((*sn) == NULL) { 926 PF_HASHROW_UNLOCK(sh); 927 reason = PFRES_MEMORY; 928 goto done; 929 } 930 931 for (int i = 0; i < 2; i++) { 932 (*sn)->bytes[i] = counter_u64_alloc(M_NOWAIT); 933 (*sn)->packets[i] = counter_u64_alloc(M_NOWAIT); 934 935 if ((*sn)->bytes[i] == NULL || (*sn)->packets[i] == NULL) { 936 pf_free_src_node(*sn); 937 PF_HASHROW_UNLOCK(sh); 938 reason = PFRES_MEMORY; 939 goto done; 940 } 941 } 942 943 pf_init_threshold(&(*sn)->conn_rate, 944 rule->max_src_conn_rate.limit, 945 rule->max_src_conn_rate.seconds); 946 947 MPASS((*sn)->lock == NULL); 948 (*sn)->lock = &sh->lock; 949 950 (*sn)->af = af; 951 (*sn)->rule.ptr = rule; 952 PF_ACPY(&(*sn)->addr, src, af); 953 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 954 (*sn)->creation = time_uptime; 955 (*sn)->ruletype = rule->action; 956 (*sn)->states = 1; 957 if ((*sn)->rule.ptr != NULL) 958 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 959 PF_HASHROW_UNLOCK(sh); 960 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 961 } else { 962 if (rule->max_src_states && 963 (*sn)->states >= rule->max_src_states) { 964 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 965 1); 966 reason = PFRES_SRCLIMIT; 967 goto done; 968 } 969 } 970 done: 971 return (reason); 972 } 973 974 void 975 pf_unlink_src_node(struct pf_ksrc_node *src) 976 { 977 PF_SRC_NODE_LOCK_ASSERT(src); 978 979 LIST_REMOVE(src, entry); 980 if (src->rule.ptr) 981 counter_u64_add(src->rule.ptr->src_nodes, -1); 982 } 983 984 u_int 985 pf_free_src_nodes(struct pf_ksrc_node_list *head) 986 { 987 struct pf_ksrc_node *sn, *tmp; 988 u_int count = 0; 989 990 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 991 pf_free_src_node(sn); 992 count++; 993 } 994 995 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count); 996 997 return (count); 998 } 999 1000 void 1001 pf_mtag_initialize(void) 1002 { 1003 1004 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 1005 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 1006 UMA_ALIGN_PTR, 0); 1007 } 1008 1009 /* Per-vnet data storage structures initialization. */ 1010 void 1011 pf_initialize(void) 1012 { 1013 struct pf_keyhash *kh; 1014 struct pf_idhash *ih; 1015 struct pf_srchash *sh; 1016 u_int i; 1017 1018 if (pf_hashsize == 0 || !powerof2(pf_hashsize)) 1019 pf_hashsize = PF_HASHSIZ; 1020 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) 1021 pf_srchashsize = PF_SRCHASHSIZ; 1022 1023 V_pf_hashseed = arc4random(); 1024 1025 /* States and state keys storage. */ 1026 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_kstate), 1027 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 1028 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 1029 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 1030 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 1031 1032 V_pf_state_key_z = uma_zcreate("pf state keys", 1033 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 1034 UMA_ALIGN_PTR, 0); 1035 1036 V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash), 1037 M_PFHASH, M_NOWAIT | M_ZERO); 1038 V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash), 1039 M_PFHASH, M_NOWAIT | M_ZERO); 1040 if (V_pf_keyhash == NULL || V_pf_idhash == NULL) { 1041 printf("pf: Unable to allocate memory for " 1042 "state_hashsize %lu.\n", pf_hashsize); 1043 1044 free(V_pf_keyhash, M_PFHASH); 1045 free(V_pf_idhash, M_PFHASH); 1046 1047 pf_hashsize = PF_HASHSIZ; 1048 V_pf_keyhash = mallocarray(pf_hashsize, 1049 sizeof(struct pf_keyhash), M_PFHASH, M_WAITOK | M_ZERO); 1050 V_pf_idhash = mallocarray(pf_hashsize, 1051 sizeof(struct pf_idhash), M_PFHASH, M_WAITOK | M_ZERO); 1052 } 1053 1054 pf_hashmask = pf_hashsize - 1; 1055 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 1056 i++, kh++, ih++) { 1057 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 1058 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 1059 } 1060 1061 /* Source nodes. */ 1062 V_pf_sources_z = uma_zcreate("pf source nodes", 1063 sizeof(struct pf_ksrc_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 1064 0); 1065 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 1066 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 1067 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 1068 1069 V_pf_srchash = mallocarray(pf_srchashsize, 1070 sizeof(struct pf_srchash), M_PFHASH, M_NOWAIT | M_ZERO); 1071 if (V_pf_srchash == NULL) { 1072 printf("pf: Unable to allocate memory for " 1073 "source_hashsize %lu.\n", pf_srchashsize); 1074 1075 pf_srchashsize = PF_SRCHASHSIZ; 1076 V_pf_srchash = mallocarray(pf_srchashsize, 1077 sizeof(struct pf_srchash), M_PFHASH, M_WAITOK | M_ZERO); 1078 } 1079 1080 pf_srchashmask = pf_srchashsize - 1; 1081 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) 1082 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 1083 1084 /* ALTQ */ 1085 TAILQ_INIT(&V_pf_altqs[0]); 1086 TAILQ_INIT(&V_pf_altqs[1]); 1087 TAILQ_INIT(&V_pf_altqs[2]); 1088 TAILQ_INIT(&V_pf_altqs[3]); 1089 TAILQ_INIT(&V_pf_pabuf); 1090 V_pf_altqs_active = &V_pf_altqs[0]; 1091 V_pf_altq_ifs_active = &V_pf_altqs[1]; 1092 V_pf_altqs_inactive = &V_pf_altqs[2]; 1093 V_pf_altq_ifs_inactive = &V_pf_altqs[3]; 1094 1095 /* Send & overload+flush queues. */ 1096 STAILQ_INIT(&V_pf_sendqueue); 1097 SLIST_INIT(&V_pf_overloadqueue); 1098 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 1099 1100 /* Unlinked, but may be referenced rules. */ 1101 TAILQ_INIT(&V_pf_unlinked_rules); 1102 } 1103 1104 void 1105 pf_mtag_cleanup(void) 1106 { 1107 1108 uma_zdestroy(pf_mtag_z); 1109 } 1110 1111 void 1112 pf_cleanup(void) 1113 { 1114 struct pf_keyhash *kh; 1115 struct pf_idhash *ih; 1116 struct pf_srchash *sh; 1117 struct pf_send_entry *pfse, *next; 1118 u_int i; 1119 1120 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 1121 i++, kh++, ih++) { 1122 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 1123 __func__)); 1124 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 1125 __func__)); 1126 mtx_destroy(&kh->lock); 1127 mtx_destroy(&ih->lock); 1128 } 1129 free(V_pf_keyhash, M_PFHASH); 1130 free(V_pf_idhash, M_PFHASH); 1131 1132 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1133 KASSERT(LIST_EMPTY(&sh->nodes), 1134 ("%s: source node hash not empty", __func__)); 1135 mtx_destroy(&sh->lock); 1136 } 1137 free(V_pf_srchash, M_PFHASH); 1138 1139 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 1140 m_freem(pfse->pfse_m); 1141 free(pfse, M_PFTEMP); 1142 } 1143 1144 uma_zdestroy(V_pf_sources_z); 1145 uma_zdestroy(V_pf_state_z); 1146 uma_zdestroy(V_pf_state_key_z); 1147 } 1148 1149 static int 1150 pf_mtag_uminit(void *mem, int size, int how) 1151 { 1152 struct m_tag *t; 1153 1154 t = (struct m_tag *)mem; 1155 t->m_tag_cookie = MTAG_ABI_COMPAT; 1156 t->m_tag_id = PACKET_TAG_PF; 1157 t->m_tag_len = sizeof(struct pf_mtag); 1158 t->m_tag_free = pf_mtag_free; 1159 1160 return (0); 1161 } 1162 1163 static void 1164 pf_mtag_free(struct m_tag *t) 1165 { 1166 1167 uma_zfree(pf_mtag_z, t); 1168 } 1169 1170 struct pf_mtag * 1171 pf_get_mtag(struct mbuf *m) 1172 { 1173 struct m_tag *mtag; 1174 1175 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 1176 return ((struct pf_mtag *)(mtag + 1)); 1177 1178 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 1179 if (mtag == NULL) 1180 return (NULL); 1181 bzero(mtag + 1, sizeof(struct pf_mtag)); 1182 m_tag_prepend(m, mtag); 1183 1184 return ((struct pf_mtag *)(mtag + 1)); 1185 } 1186 1187 static int 1188 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 1189 struct pf_kstate *s) 1190 { 1191 struct pf_keyhash *khs, *khw, *kh; 1192 struct pf_state_key *sk, *cur; 1193 struct pf_kstate *si, *olds = NULL; 1194 int idx; 1195 1196 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1197 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 1198 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 1199 1200 /* 1201 * We need to lock hash slots of both keys. To avoid deadlock 1202 * we always lock the slot with lower address first. Unlock order 1203 * isn't important. 1204 * 1205 * We also need to lock ID hash slot before dropping key 1206 * locks. On success we return with ID hash slot locked. 1207 */ 1208 1209 if (skw == sks) { 1210 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 1211 PF_HASHROW_LOCK(khs); 1212 } else { 1213 khs = &V_pf_keyhash[pf_hashkey(sks)]; 1214 khw = &V_pf_keyhash[pf_hashkey(skw)]; 1215 if (khs == khw) { 1216 PF_HASHROW_LOCK(khs); 1217 } else if (khs < khw) { 1218 PF_HASHROW_LOCK(khs); 1219 PF_HASHROW_LOCK(khw); 1220 } else { 1221 PF_HASHROW_LOCK(khw); 1222 PF_HASHROW_LOCK(khs); 1223 } 1224 } 1225 1226 #define KEYS_UNLOCK() do { \ 1227 if (khs != khw) { \ 1228 PF_HASHROW_UNLOCK(khs); \ 1229 PF_HASHROW_UNLOCK(khw); \ 1230 } else \ 1231 PF_HASHROW_UNLOCK(khs); \ 1232 } while (0) 1233 1234 /* 1235 * First run: start with wire key. 1236 */ 1237 sk = skw; 1238 kh = khw; 1239 idx = PF_SK_WIRE; 1240 1241 MPASS(s->lock == NULL); 1242 s->lock = &V_pf_idhash[PF_IDHASH(s)].lock; 1243 1244 keyattach: 1245 LIST_FOREACH(cur, &kh->keys, entry) 1246 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 1247 break; 1248 1249 if (cur != NULL) { 1250 /* Key exists. Check for same kif, if none, add to key. */ 1251 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 1252 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 1253 1254 PF_HASHROW_LOCK(ih); 1255 if (si->kif == s->kif && 1256 si->direction == s->direction) { 1257 if (sk->proto == IPPROTO_TCP && 1258 si->src.state >= TCPS_FIN_WAIT_2 && 1259 si->dst.state >= TCPS_FIN_WAIT_2) { 1260 /* 1261 * New state matches an old >FIN_WAIT_2 1262 * state. We can't drop key hash locks, 1263 * thus we can't unlink it properly. 1264 * 1265 * As a workaround we drop it into 1266 * TCPS_CLOSED state, schedule purge 1267 * ASAP and push it into the very end 1268 * of the slot TAILQ, so that it won't 1269 * conflict with our new state. 1270 */ 1271 pf_set_protostate(si, PF_PEER_BOTH, 1272 TCPS_CLOSED); 1273 si->timeout = PFTM_PURGE; 1274 olds = si; 1275 } else { 1276 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1277 printf("pf: %s key attach " 1278 "failed on %s: ", 1279 (idx == PF_SK_WIRE) ? 1280 "wire" : "stack", 1281 s->kif->pfik_name); 1282 pf_print_state_parts(s, 1283 (idx == PF_SK_WIRE) ? 1284 sk : NULL, 1285 (idx == PF_SK_STACK) ? 1286 sk : NULL); 1287 printf(", existing: "); 1288 pf_print_state_parts(si, 1289 (idx == PF_SK_WIRE) ? 1290 sk : NULL, 1291 (idx == PF_SK_STACK) ? 1292 sk : NULL); 1293 printf("\n"); 1294 } 1295 PF_HASHROW_UNLOCK(ih); 1296 KEYS_UNLOCK(); 1297 uma_zfree(V_pf_state_key_z, sk); 1298 if (idx == PF_SK_STACK) 1299 pf_detach_state(s); 1300 return (EEXIST); /* collision! */ 1301 } 1302 } 1303 PF_HASHROW_UNLOCK(ih); 1304 } 1305 uma_zfree(V_pf_state_key_z, sk); 1306 s->key[idx] = cur; 1307 } else { 1308 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1309 s->key[idx] = sk; 1310 } 1311 1312 stateattach: 1313 /* List is sorted, if-bound states before floating. */ 1314 if (s->kif == V_pfi_all) 1315 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1316 else 1317 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1318 1319 if (olds) { 1320 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1321 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1322 key_list[idx]); 1323 olds = NULL; 1324 } 1325 1326 /* 1327 * Attach done. See how should we (or should not?) 1328 * attach a second key. 1329 */ 1330 if (sks == skw) { 1331 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1332 idx = PF_SK_STACK; 1333 sks = NULL; 1334 goto stateattach; 1335 } else if (sks != NULL) { 1336 /* 1337 * Continue attaching with stack key. 1338 */ 1339 sk = sks; 1340 kh = khs; 1341 idx = PF_SK_STACK; 1342 sks = NULL; 1343 goto keyattach; 1344 } 1345 1346 PF_STATE_LOCK(s); 1347 KEYS_UNLOCK(); 1348 1349 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1350 ("%s failure", __func__)); 1351 1352 return (0); 1353 #undef KEYS_UNLOCK 1354 } 1355 1356 static void 1357 pf_detach_state(struct pf_kstate *s) 1358 { 1359 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1360 struct pf_keyhash *kh; 1361 1362 if (sks != NULL) { 1363 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1364 PF_HASHROW_LOCK(kh); 1365 if (s->key[PF_SK_STACK] != NULL) 1366 pf_state_key_detach(s, PF_SK_STACK); 1367 /* 1368 * If both point to same key, then we are done. 1369 */ 1370 if (sks == s->key[PF_SK_WIRE]) { 1371 pf_state_key_detach(s, PF_SK_WIRE); 1372 PF_HASHROW_UNLOCK(kh); 1373 return; 1374 } 1375 PF_HASHROW_UNLOCK(kh); 1376 } 1377 1378 if (s->key[PF_SK_WIRE] != NULL) { 1379 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1380 PF_HASHROW_LOCK(kh); 1381 if (s->key[PF_SK_WIRE] != NULL) 1382 pf_state_key_detach(s, PF_SK_WIRE); 1383 PF_HASHROW_UNLOCK(kh); 1384 } 1385 } 1386 1387 static void 1388 pf_state_key_detach(struct pf_kstate *s, int idx) 1389 { 1390 struct pf_state_key *sk = s->key[idx]; 1391 #ifdef INVARIANTS 1392 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1393 1394 PF_HASHROW_ASSERT(kh); 1395 #endif 1396 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1397 s->key[idx] = NULL; 1398 1399 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1400 LIST_REMOVE(sk, entry); 1401 uma_zfree(V_pf_state_key_z, sk); 1402 } 1403 } 1404 1405 static int 1406 pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1407 { 1408 struct pf_state_key *sk = mem; 1409 1410 bzero(sk, sizeof(struct pf_state_key_cmp)); 1411 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1412 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1413 1414 return (0); 1415 } 1416 1417 struct pf_state_key * 1418 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1419 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1420 { 1421 struct pf_state_key *sk; 1422 1423 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1424 if (sk == NULL) 1425 return (NULL); 1426 1427 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1428 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1429 sk->port[pd->sidx] = sport; 1430 sk->port[pd->didx] = dport; 1431 sk->proto = pd->proto; 1432 sk->af = pd->af; 1433 1434 return (sk); 1435 } 1436 1437 struct pf_state_key * 1438 pf_state_key_clone(struct pf_state_key *orig) 1439 { 1440 struct pf_state_key *sk; 1441 1442 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1443 if (sk == NULL) 1444 return (NULL); 1445 1446 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1447 1448 return (sk); 1449 } 1450 1451 int 1452 pf_state_insert(struct pfi_kkif *kif, struct pfi_kkif *orig_kif, 1453 struct pf_state_key *skw, struct pf_state_key *sks, struct pf_kstate *s) 1454 { 1455 struct pf_idhash *ih; 1456 struct pf_kstate *cur; 1457 int error; 1458 1459 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1460 ("%s: sks not pristine", __func__)); 1461 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1462 ("%s: skw not pristine", __func__)); 1463 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1464 1465 s->kif = kif; 1466 s->orig_kif = orig_kif; 1467 1468 if (s->id == 0 && s->creatorid == 0) { 1469 s->id = alloc_unr64(&V_pf_stateid); 1470 s->id = htobe64(s->id); 1471 s->creatorid = V_pf_status.hostid; 1472 } 1473 1474 /* Returns with ID locked on success. */ 1475 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1476 return (error); 1477 1478 ih = &V_pf_idhash[PF_IDHASH(s)]; 1479 PF_HASHROW_ASSERT(ih); 1480 LIST_FOREACH(cur, &ih->states, entry) 1481 if (cur->id == s->id && cur->creatorid == s->creatorid) 1482 break; 1483 1484 if (cur != NULL) { 1485 PF_HASHROW_UNLOCK(ih); 1486 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1487 printf("pf: state ID collision: " 1488 "id: %016llx creatorid: %08x\n", 1489 (unsigned long long)be64toh(s->id), 1490 ntohl(s->creatorid)); 1491 } 1492 pf_detach_state(s); 1493 return (EEXIST); 1494 } 1495 LIST_INSERT_HEAD(&ih->states, s, entry); 1496 /* One for keys, one for ID hash. */ 1497 refcount_init(&s->refs, 2); 1498 1499 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1500 if (V_pfsync_insert_state_ptr != NULL) 1501 V_pfsync_insert_state_ptr(s); 1502 1503 /* Returns locked. */ 1504 return (0); 1505 } 1506 1507 /* 1508 * Find state by ID: returns with locked row on success. 1509 */ 1510 struct pf_kstate * 1511 pf_find_state_byid(uint64_t id, uint32_t creatorid) 1512 { 1513 struct pf_idhash *ih; 1514 struct pf_kstate *s; 1515 1516 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1517 1518 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; 1519 1520 PF_HASHROW_LOCK(ih); 1521 LIST_FOREACH(s, &ih->states, entry) 1522 if (s->id == id && s->creatorid == creatorid) 1523 break; 1524 1525 if (s == NULL) 1526 PF_HASHROW_UNLOCK(ih); 1527 1528 return (s); 1529 } 1530 1531 /* 1532 * Find state by key. 1533 * Returns with ID hash slot locked on success. 1534 */ 1535 static struct pf_kstate * 1536 pf_find_state(struct pfi_kkif *kif, struct pf_state_key_cmp *key, u_int dir) 1537 { 1538 struct pf_keyhash *kh; 1539 struct pf_state_key *sk; 1540 struct pf_kstate *s; 1541 int idx; 1542 1543 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1544 1545 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1546 1547 PF_HASHROW_LOCK(kh); 1548 LIST_FOREACH(sk, &kh->keys, entry) 1549 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1550 break; 1551 if (sk == NULL) { 1552 PF_HASHROW_UNLOCK(kh); 1553 return (NULL); 1554 } 1555 1556 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1557 1558 /* List is sorted, if-bound states before floating ones. */ 1559 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1560 if (s->kif == V_pfi_all || s->kif == kif) { 1561 PF_STATE_LOCK(s); 1562 PF_HASHROW_UNLOCK(kh); 1563 if (__predict_false(s->timeout >= PFTM_MAX)) { 1564 /* 1565 * State is either being processed by 1566 * pf_unlink_state() in an other thread, or 1567 * is scheduled for immediate expiry. 1568 */ 1569 PF_STATE_UNLOCK(s); 1570 return (NULL); 1571 } 1572 return (s); 1573 } 1574 PF_HASHROW_UNLOCK(kh); 1575 1576 return (NULL); 1577 } 1578 1579 /* 1580 * Returns with ID hash slot locked on success. 1581 */ 1582 struct pf_kstate * 1583 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1584 { 1585 struct pf_keyhash *kh; 1586 struct pf_state_key *sk; 1587 struct pf_kstate *s, *ret = NULL; 1588 int idx, inout = 0; 1589 1590 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1591 1592 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1593 1594 PF_HASHROW_LOCK(kh); 1595 LIST_FOREACH(sk, &kh->keys, entry) 1596 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1597 break; 1598 if (sk == NULL) { 1599 PF_HASHROW_UNLOCK(kh); 1600 return (NULL); 1601 } 1602 switch (dir) { 1603 case PF_IN: 1604 idx = PF_SK_WIRE; 1605 break; 1606 case PF_OUT: 1607 idx = PF_SK_STACK; 1608 break; 1609 case PF_INOUT: 1610 idx = PF_SK_WIRE; 1611 inout = 1; 1612 break; 1613 default: 1614 panic("%s: dir %u", __func__, dir); 1615 } 1616 second_run: 1617 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1618 if (more == NULL) { 1619 PF_STATE_LOCK(s); 1620 PF_HASHROW_UNLOCK(kh); 1621 return (s); 1622 } 1623 1624 if (ret) 1625 (*more)++; 1626 else { 1627 ret = s; 1628 PF_STATE_LOCK(s); 1629 } 1630 } 1631 if (inout == 1) { 1632 inout = 0; 1633 idx = PF_SK_STACK; 1634 goto second_run; 1635 } 1636 PF_HASHROW_UNLOCK(kh); 1637 1638 return (ret); 1639 } 1640 1641 /* 1642 * FIXME 1643 * This routine is inefficient -- locks the state only to unlock immediately on 1644 * return. 1645 * It is racy -- after the state is unlocked nothing stops other threads from 1646 * removing it. 1647 */ 1648 bool 1649 pf_find_state_all_exists(struct pf_state_key_cmp *key, u_int dir) 1650 { 1651 struct pf_kstate *s; 1652 1653 s = pf_find_state_all(key, dir, NULL); 1654 if (s != NULL) { 1655 PF_STATE_UNLOCK(s); 1656 return (true); 1657 } 1658 return (false); 1659 } 1660 1661 /* END state table stuff */ 1662 1663 static void 1664 pf_send(struct pf_send_entry *pfse) 1665 { 1666 1667 PF_SENDQ_LOCK(); 1668 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1669 PF_SENDQ_UNLOCK(); 1670 swi_sched(V_pf_swi_cookie, 0); 1671 } 1672 1673 static bool 1674 pf_isforlocal(struct mbuf *m, int af) 1675 { 1676 switch (af) { 1677 #ifdef INET 1678 case AF_INET: { 1679 struct ip *ip = mtod(m, struct ip *); 1680 1681 return (in_localip(ip->ip_dst)); 1682 } 1683 #endif 1684 #ifdef INET6 1685 case AF_INET6: { 1686 struct ip6_hdr *ip6; 1687 struct in6_ifaddr *ia; 1688 ip6 = mtod(m, struct ip6_hdr *); 1689 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 1690 if (ia == NULL) 1691 return (false); 1692 return (! (ia->ia6_flags & IN6_IFF_NOTREADY)); 1693 } 1694 #endif 1695 default: 1696 panic("Unsupported af %d", af); 1697 } 1698 1699 return (false); 1700 } 1701 1702 void 1703 pf_intr(void *v) 1704 { 1705 struct epoch_tracker et; 1706 struct pf_send_head queue; 1707 struct pf_send_entry *pfse, *next; 1708 1709 CURVNET_SET((struct vnet *)v); 1710 1711 PF_SENDQ_LOCK(); 1712 queue = V_pf_sendqueue; 1713 STAILQ_INIT(&V_pf_sendqueue); 1714 PF_SENDQ_UNLOCK(); 1715 1716 NET_EPOCH_ENTER(et); 1717 1718 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1719 switch (pfse->pfse_type) { 1720 #ifdef INET 1721 case PFSE_IP: { 1722 if (pf_isforlocal(pfse->pfse_m, AF_INET)) { 1723 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; 1724 pfse->pfse_m->m_pkthdr.csum_flags |= 1725 CSUM_IP_VALID | CSUM_IP_CHECKED; 1726 ip_input(pfse->pfse_m); 1727 } else { 1728 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, 1729 NULL); 1730 } 1731 break; 1732 } 1733 case PFSE_ICMP: 1734 icmp_error(pfse->pfse_m, pfse->icmpopts.type, 1735 pfse->icmpopts.code, 0, pfse->icmpopts.mtu); 1736 break; 1737 #endif /* INET */ 1738 #ifdef INET6 1739 case PFSE_IP6: 1740 if (pf_isforlocal(pfse->pfse_m, AF_INET6)) { 1741 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; 1742 ip6_input(pfse->pfse_m); 1743 } else { 1744 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, 1745 NULL, NULL); 1746 } 1747 break; 1748 case PFSE_ICMP6: 1749 icmp6_error(pfse->pfse_m, pfse->icmpopts.type, 1750 pfse->icmpopts.code, pfse->icmpopts.mtu); 1751 break; 1752 #endif /* INET6 */ 1753 default: 1754 panic("%s: unknown type", __func__); 1755 } 1756 free(pfse, M_PFTEMP); 1757 } 1758 NET_EPOCH_EXIT(et); 1759 CURVNET_RESTORE(); 1760 } 1761 1762 #define pf_purge_thread_period (hz / 10) 1763 1764 #ifdef PF_WANT_32_TO_64_COUNTER 1765 static void 1766 pf_status_counter_u64_periodic(void) 1767 { 1768 1769 PF_RULES_RASSERT(); 1770 1771 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 60)) != 0) { 1772 return; 1773 } 1774 1775 for (int i = 0; i < FCNT_MAX; i++) { 1776 pf_counter_u64_periodic(&V_pf_status.fcounters[i]); 1777 } 1778 } 1779 1780 static void 1781 pf_kif_counter_u64_periodic(void) 1782 { 1783 struct pfi_kkif *kif; 1784 size_t r, run; 1785 1786 PF_RULES_RASSERT(); 1787 1788 if (__predict_false(V_pf_allkifcount == 0)) { 1789 return; 1790 } 1791 1792 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { 1793 return; 1794 } 1795 1796 run = V_pf_allkifcount / 10; 1797 if (run < 5) 1798 run = 5; 1799 1800 for (r = 0; r < run; r++) { 1801 kif = LIST_NEXT(V_pf_kifmarker, pfik_allkiflist); 1802 if (kif == NULL) { 1803 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); 1804 LIST_INSERT_HEAD(&V_pf_allkiflist, V_pf_kifmarker, pfik_allkiflist); 1805 break; 1806 } 1807 1808 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); 1809 LIST_INSERT_AFTER(kif, V_pf_kifmarker, pfik_allkiflist); 1810 1811 for (int i = 0; i < 2; i++) { 1812 for (int j = 0; j < 2; j++) { 1813 for (int k = 0; k < 2; k++) { 1814 pf_counter_u64_periodic(&kif->pfik_packets[i][j][k]); 1815 pf_counter_u64_periodic(&kif->pfik_bytes[i][j][k]); 1816 } 1817 } 1818 } 1819 } 1820 } 1821 1822 static void 1823 pf_rule_counter_u64_periodic(void) 1824 { 1825 struct pf_krule *rule; 1826 size_t r, run; 1827 1828 PF_RULES_RASSERT(); 1829 1830 if (__predict_false(V_pf_allrulecount == 0)) { 1831 return; 1832 } 1833 1834 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { 1835 return; 1836 } 1837 1838 run = V_pf_allrulecount / 10; 1839 if (run < 5) 1840 run = 5; 1841 1842 for (r = 0; r < run; r++) { 1843 rule = LIST_NEXT(V_pf_rulemarker, allrulelist); 1844 if (rule == NULL) { 1845 LIST_REMOVE(V_pf_rulemarker, allrulelist); 1846 LIST_INSERT_HEAD(&V_pf_allrulelist, V_pf_rulemarker, allrulelist); 1847 break; 1848 } 1849 1850 LIST_REMOVE(V_pf_rulemarker, allrulelist); 1851 LIST_INSERT_AFTER(rule, V_pf_rulemarker, allrulelist); 1852 1853 pf_counter_u64_periodic(&rule->evaluations); 1854 for (int i = 0; i < 2; i++) { 1855 pf_counter_u64_periodic(&rule->packets[i]); 1856 pf_counter_u64_periodic(&rule->bytes[i]); 1857 } 1858 } 1859 } 1860 1861 static void 1862 pf_counter_u64_periodic_main(void) 1863 { 1864 PF_RULES_RLOCK_TRACKER; 1865 1866 V_pf_counter_periodic_iter++; 1867 1868 PF_RULES_RLOCK(); 1869 pf_counter_u64_critical_enter(); 1870 pf_status_counter_u64_periodic(); 1871 pf_kif_counter_u64_periodic(); 1872 pf_rule_counter_u64_periodic(); 1873 pf_counter_u64_critical_exit(); 1874 PF_RULES_RUNLOCK(); 1875 } 1876 #else 1877 #define pf_counter_u64_periodic_main() do { } while (0) 1878 #endif 1879 1880 void 1881 pf_purge_thread(void *unused __unused) 1882 { 1883 VNET_ITERATOR_DECL(vnet_iter); 1884 1885 sx_xlock(&pf_end_lock); 1886 while (pf_end_threads == 0) { 1887 sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", pf_purge_thread_period); 1888 1889 VNET_LIST_RLOCK(); 1890 VNET_FOREACH(vnet_iter) { 1891 CURVNET_SET(vnet_iter); 1892 1893 /* Wait until V_pf_default_rule is initialized. */ 1894 if (V_pf_vnet_active == 0) { 1895 CURVNET_RESTORE(); 1896 continue; 1897 } 1898 1899 pf_counter_u64_periodic_main(); 1900 1901 /* 1902 * Process 1/interval fraction of the state 1903 * table every run. 1904 */ 1905 V_pf_purge_idx = 1906 pf_purge_expired_states(V_pf_purge_idx, pf_hashmask / 1907 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1908 1909 /* 1910 * Purge other expired types every 1911 * PFTM_INTERVAL seconds. 1912 */ 1913 if (V_pf_purge_idx == 0) { 1914 /* 1915 * Order is important: 1916 * - states and src nodes reference rules 1917 * - states and rules reference kifs 1918 */ 1919 pf_purge_expired_fragments(); 1920 pf_purge_expired_src_nodes(); 1921 pf_purge_unlinked_rules(); 1922 pfi_kkif_purge(); 1923 } 1924 CURVNET_RESTORE(); 1925 } 1926 VNET_LIST_RUNLOCK(); 1927 } 1928 1929 pf_end_threads++; 1930 sx_xunlock(&pf_end_lock); 1931 kproc_exit(0); 1932 } 1933 1934 void 1935 pf_unload_vnet_purge(void) 1936 { 1937 1938 /* 1939 * To cleanse up all kifs and rules we need 1940 * two runs: first one clears reference flags, 1941 * then pf_purge_expired_states() doesn't 1942 * raise them, and then second run frees. 1943 */ 1944 pf_purge_unlinked_rules(); 1945 pfi_kkif_purge(); 1946 1947 /* 1948 * Now purge everything. 1949 */ 1950 pf_purge_expired_states(0, pf_hashmask); 1951 pf_purge_fragments(UINT_MAX); 1952 pf_purge_expired_src_nodes(); 1953 1954 /* 1955 * Now all kifs & rules should be unreferenced, 1956 * thus should be successfully freed. 1957 */ 1958 pf_purge_unlinked_rules(); 1959 pfi_kkif_purge(); 1960 } 1961 1962 u_int32_t 1963 pf_state_expires(const struct pf_kstate *state) 1964 { 1965 u_int32_t timeout; 1966 u_int32_t start; 1967 u_int32_t end; 1968 u_int32_t states; 1969 1970 /* handle all PFTM_* > PFTM_MAX here */ 1971 if (state->timeout == PFTM_PURGE) 1972 return (time_uptime); 1973 KASSERT(state->timeout != PFTM_UNLINKED, 1974 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1975 KASSERT((state->timeout < PFTM_MAX), 1976 ("pf_state_expires: timeout > PFTM_MAX")); 1977 timeout = state->rule.ptr->timeout[state->timeout]; 1978 if (!timeout) 1979 timeout = V_pf_default_rule.timeout[state->timeout]; 1980 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1981 if (start && state->rule.ptr != &V_pf_default_rule) { 1982 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1983 states = counter_u64_fetch(state->rule.ptr->states_cur); 1984 } else { 1985 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1986 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1987 states = V_pf_status.states; 1988 } 1989 if (end && states > start && start < end) { 1990 if (states < end) { 1991 timeout = (u_int64_t)timeout * (end - states) / 1992 (end - start); 1993 return (state->expire + timeout); 1994 } 1995 else 1996 return (time_uptime); 1997 } 1998 return (state->expire + timeout); 1999 } 2000 2001 void 2002 pf_purge_expired_src_nodes(void) 2003 { 2004 struct pf_ksrc_node_list freelist; 2005 struct pf_srchash *sh; 2006 struct pf_ksrc_node *cur, *next; 2007 int i; 2008 2009 LIST_INIT(&freelist); 2010 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 2011 PF_HASHROW_LOCK(sh); 2012 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 2013 if (cur->states == 0 && cur->expire <= time_uptime) { 2014 pf_unlink_src_node(cur); 2015 LIST_INSERT_HEAD(&freelist, cur, entry); 2016 } else if (cur->rule.ptr != NULL) 2017 cur->rule.ptr->rule_ref |= PFRULE_REFS; 2018 PF_HASHROW_UNLOCK(sh); 2019 } 2020 2021 pf_free_src_nodes(&freelist); 2022 2023 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 2024 } 2025 2026 static void 2027 pf_src_tree_remove_state(struct pf_kstate *s) 2028 { 2029 struct pf_ksrc_node *sn; 2030 uint32_t timeout; 2031 2032 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ? 2033 s->rule.ptr->timeout[PFTM_SRC_NODE] : 2034 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 2035 2036 if (s->src_node != NULL) { 2037 sn = s->src_node; 2038 PF_SRC_NODE_LOCK(sn); 2039 if (s->src.tcp_est) 2040 --sn->conn; 2041 if (--sn->states == 0) 2042 sn->expire = time_uptime + timeout; 2043 PF_SRC_NODE_UNLOCK(sn); 2044 } 2045 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 2046 sn = s->nat_src_node; 2047 PF_SRC_NODE_LOCK(sn); 2048 if (--sn->states == 0) 2049 sn->expire = time_uptime + timeout; 2050 PF_SRC_NODE_UNLOCK(sn); 2051 } 2052 s->src_node = s->nat_src_node = NULL; 2053 } 2054 2055 /* 2056 * Unlink and potentilly free a state. Function may be 2057 * called with ID hash row locked, but always returns 2058 * unlocked, since it needs to go through key hash locking. 2059 */ 2060 int 2061 pf_unlink_state(struct pf_kstate *s) 2062 { 2063 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 2064 2065 PF_HASHROW_ASSERT(ih); 2066 2067 if (s->timeout == PFTM_UNLINKED) { 2068 /* 2069 * State is being processed 2070 * by pf_unlink_state() in 2071 * an other thread. 2072 */ 2073 PF_HASHROW_UNLOCK(ih); 2074 return (0); /* XXXGL: undefined actually */ 2075 } 2076 2077 if (s->src.state == PF_TCPS_PROXY_DST) { 2078 /* XXX wire key the right one? */ 2079 pf_send_tcp(s->rule.ptr, s->key[PF_SK_WIRE]->af, 2080 &s->key[PF_SK_WIRE]->addr[1], 2081 &s->key[PF_SK_WIRE]->addr[0], 2082 s->key[PF_SK_WIRE]->port[1], 2083 s->key[PF_SK_WIRE]->port[0], 2084 s->src.seqhi, s->src.seqlo + 1, 2085 TH_RST|TH_ACK, 0, 0, 0, true, s->tag, 0, s->act.rtableid); 2086 } 2087 2088 LIST_REMOVE(s, entry); 2089 pf_src_tree_remove_state(s); 2090 2091 if (V_pfsync_delete_state_ptr != NULL) 2092 V_pfsync_delete_state_ptr(s); 2093 2094 STATE_DEC_COUNTERS(s); 2095 2096 s->timeout = PFTM_UNLINKED; 2097 2098 /* Ensure we remove it from the list of halfopen states, if needed. */ 2099 if (s->key[PF_SK_STACK] != NULL && 2100 s->key[PF_SK_STACK]->proto == IPPROTO_TCP) 2101 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED); 2102 2103 PF_HASHROW_UNLOCK(ih); 2104 2105 pf_detach_state(s); 2106 /* pf_state_insert() initialises refs to 2 */ 2107 return (pf_release_staten(s, 2)); 2108 } 2109 2110 struct pf_kstate * 2111 pf_alloc_state(int flags) 2112 { 2113 2114 return (uma_zalloc(V_pf_state_z, flags | M_ZERO)); 2115 } 2116 2117 void 2118 pf_free_state(struct pf_kstate *cur) 2119 { 2120 struct pf_krule_item *ri; 2121 2122 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 2123 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 2124 cur->timeout)); 2125 2126 while ((ri = SLIST_FIRST(&cur->match_rules))) { 2127 SLIST_REMOVE_HEAD(&cur->match_rules, entry); 2128 free(ri, M_PF_RULE_ITEM); 2129 } 2130 2131 pf_normalize_tcp_cleanup(cur); 2132 uma_zfree(V_pf_state_z, cur); 2133 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 2134 } 2135 2136 /* 2137 * Called only from pf_purge_thread(), thus serialized. 2138 */ 2139 static u_int 2140 pf_purge_expired_states(u_int i, int maxcheck) 2141 { 2142 struct pf_idhash *ih; 2143 struct pf_kstate *s; 2144 struct pf_krule_item *mrm; 2145 2146 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2147 2148 /* 2149 * Go through hash and unlink states that expire now. 2150 */ 2151 while (maxcheck > 0) { 2152 ih = &V_pf_idhash[i]; 2153 2154 /* only take the lock if we expect to do work */ 2155 if (!LIST_EMPTY(&ih->states)) { 2156 relock: 2157 PF_HASHROW_LOCK(ih); 2158 LIST_FOREACH(s, &ih->states, entry) { 2159 if (pf_state_expires(s) <= time_uptime) { 2160 V_pf_status.states -= 2161 pf_unlink_state(s); 2162 goto relock; 2163 } 2164 s->rule.ptr->rule_ref |= PFRULE_REFS; 2165 if (s->nat_rule.ptr != NULL) 2166 s->nat_rule.ptr->rule_ref |= PFRULE_REFS; 2167 if (s->anchor.ptr != NULL) 2168 s->anchor.ptr->rule_ref |= PFRULE_REFS; 2169 s->kif->pfik_flags |= PFI_IFLAG_REFS; 2170 SLIST_FOREACH(mrm, &s->match_rules, entry) 2171 mrm->r->rule_ref |= PFRULE_REFS; 2172 if (s->rt_kif) 2173 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 2174 } 2175 PF_HASHROW_UNLOCK(ih); 2176 } 2177 2178 /* Return when we hit end of hash. */ 2179 if (++i > pf_hashmask) { 2180 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2181 return (0); 2182 } 2183 2184 maxcheck--; 2185 } 2186 2187 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2188 2189 return (i); 2190 } 2191 2192 static void 2193 pf_purge_unlinked_rules(void) 2194 { 2195 struct pf_krulequeue tmpq; 2196 struct pf_krule *r, *r1; 2197 2198 /* 2199 * If we have overloading task pending, then we'd 2200 * better skip purging this time. There is a tiny 2201 * probability that overloading task references 2202 * an already unlinked rule. 2203 */ 2204 PF_OVERLOADQ_LOCK(); 2205 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 2206 PF_OVERLOADQ_UNLOCK(); 2207 return; 2208 } 2209 PF_OVERLOADQ_UNLOCK(); 2210 2211 /* 2212 * Do naive mark-and-sweep garbage collecting of old rules. 2213 * Reference flag is raised by pf_purge_expired_states() 2214 * and pf_purge_expired_src_nodes(). 2215 * 2216 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 2217 * use a temporary queue. 2218 */ 2219 TAILQ_INIT(&tmpq); 2220 PF_UNLNKDRULES_LOCK(); 2221 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 2222 if (!(r->rule_ref & PFRULE_REFS)) { 2223 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 2224 TAILQ_INSERT_TAIL(&tmpq, r, entries); 2225 } else 2226 r->rule_ref &= ~PFRULE_REFS; 2227 } 2228 PF_UNLNKDRULES_UNLOCK(); 2229 2230 if (!TAILQ_EMPTY(&tmpq)) { 2231 PF_CONFIG_LOCK(); 2232 PF_RULES_WLOCK(); 2233 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 2234 TAILQ_REMOVE(&tmpq, r, entries); 2235 pf_free_rule(r); 2236 } 2237 PF_RULES_WUNLOCK(); 2238 PF_CONFIG_UNLOCK(); 2239 } 2240 } 2241 2242 void 2243 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 2244 { 2245 switch (af) { 2246 #ifdef INET 2247 case AF_INET: { 2248 u_int32_t a = ntohl(addr->addr32[0]); 2249 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 2250 (a>>8)&255, a&255); 2251 if (p) { 2252 p = ntohs(p); 2253 printf(":%u", p); 2254 } 2255 break; 2256 } 2257 #endif /* INET */ 2258 #ifdef INET6 2259 case AF_INET6: { 2260 u_int16_t b; 2261 u_int8_t i, curstart, curend, maxstart, maxend; 2262 curstart = curend = maxstart = maxend = 255; 2263 for (i = 0; i < 8; i++) { 2264 if (!addr->addr16[i]) { 2265 if (curstart == 255) 2266 curstart = i; 2267 curend = i; 2268 } else { 2269 if ((curend - curstart) > 2270 (maxend - maxstart)) { 2271 maxstart = curstart; 2272 maxend = curend; 2273 } 2274 curstart = curend = 255; 2275 } 2276 } 2277 if ((curend - curstart) > 2278 (maxend - maxstart)) { 2279 maxstart = curstart; 2280 maxend = curend; 2281 } 2282 for (i = 0; i < 8; i++) { 2283 if (i >= maxstart && i <= maxend) { 2284 if (i == 0) 2285 printf(":"); 2286 if (i == maxend) 2287 printf(":"); 2288 } else { 2289 b = ntohs(addr->addr16[i]); 2290 printf("%x", b); 2291 if (i < 7) 2292 printf(":"); 2293 } 2294 } 2295 if (p) { 2296 p = ntohs(p); 2297 printf("[%u]", p); 2298 } 2299 break; 2300 } 2301 #endif /* INET6 */ 2302 } 2303 } 2304 2305 void 2306 pf_print_state(struct pf_kstate *s) 2307 { 2308 pf_print_state_parts(s, NULL, NULL); 2309 } 2310 2311 static void 2312 pf_print_state_parts(struct pf_kstate *s, 2313 struct pf_state_key *skwp, struct pf_state_key *sksp) 2314 { 2315 struct pf_state_key *skw, *sks; 2316 u_int8_t proto, dir; 2317 2318 /* Do our best to fill these, but they're skipped if NULL */ 2319 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 2320 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 2321 proto = skw ? skw->proto : (sks ? sks->proto : 0); 2322 dir = s ? s->direction : 0; 2323 2324 switch (proto) { 2325 case IPPROTO_IPV4: 2326 printf("IPv4"); 2327 break; 2328 case IPPROTO_IPV6: 2329 printf("IPv6"); 2330 break; 2331 case IPPROTO_TCP: 2332 printf("TCP"); 2333 break; 2334 case IPPROTO_UDP: 2335 printf("UDP"); 2336 break; 2337 case IPPROTO_ICMP: 2338 printf("ICMP"); 2339 break; 2340 case IPPROTO_ICMPV6: 2341 printf("ICMPv6"); 2342 break; 2343 default: 2344 printf("%u", proto); 2345 break; 2346 } 2347 switch (dir) { 2348 case PF_IN: 2349 printf(" in"); 2350 break; 2351 case PF_OUT: 2352 printf(" out"); 2353 break; 2354 } 2355 if (skw) { 2356 printf(" wire: "); 2357 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 2358 printf(" "); 2359 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 2360 } 2361 if (sks) { 2362 printf(" stack: "); 2363 if (sks != skw) { 2364 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 2365 printf(" "); 2366 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 2367 } else 2368 printf("-"); 2369 } 2370 if (s) { 2371 if (proto == IPPROTO_TCP) { 2372 printf(" [lo=%u high=%u win=%u modulator=%u", 2373 s->src.seqlo, s->src.seqhi, 2374 s->src.max_win, s->src.seqdiff); 2375 if (s->src.wscale && s->dst.wscale) 2376 printf(" wscale=%u", 2377 s->src.wscale & PF_WSCALE_MASK); 2378 printf("]"); 2379 printf(" [lo=%u high=%u win=%u modulator=%u", 2380 s->dst.seqlo, s->dst.seqhi, 2381 s->dst.max_win, s->dst.seqdiff); 2382 if (s->src.wscale && s->dst.wscale) 2383 printf(" wscale=%u", 2384 s->dst.wscale & PF_WSCALE_MASK); 2385 printf("]"); 2386 } 2387 printf(" %u:%u", s->src.state, s->dst.state); 2388 } 2389 } 2390 2391 void 2392 pf_print_flags(u_int8_t f) 2393 { 2394 if (f) 2395 printf(" "); 2396 if (f & TH_FIN) 2397 printf("F"); 2398 if (f & TH_SYN) 2399 printf("S"); 2400 if (f & TH_RST) 2401 printf("R"); 2402 if (f & TH_PUSH) 2403 printf("P"); 2404 if (f & TH_ACK) 2405 printf("A"); 2406 if (f & TH_URG) 2407 printf("U"); 2408 if (f & TH_ECE) 2409 printf("E"); 2410 if (f & TH_CWR) 2411 printf("W"); 2412 } 2413 2414 #define PF_SET_SKIP_STEPS(i) \ 2415 do { \ 2416 while (head[i] != cur) { \ 2417 head[i]->skip[i].ptr = cur; \ 2418 head[i] = TAILQ_NEXT(head[i], entries); \ 2419 } \ 2420 } while (0) 2421 2422 void 2423 pf_calc_skip_steps(struct pf_krulequeue *rules) 2424 { 2425 struct pf_krule *cur, *prev, *head[PF_SKIP_COUNT]; 2426 int i; 2427 2428 cur = TAILQ_FIRST(rules); 2429 prev = cur; 2430 for (i = 0; i < PF_SKIP_COUNT; ++i) 2431 head[i] = cur; 2432 while (cur != NULL) { 2433 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 2434 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 2435 if (cur->direction != prev->direction) 2436 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 2437 if (cur->af != prev->af) 2438 PF_SET_SKIP_STEPS(PF_SKIP_AF); 2439 if (cur->proto != prev->proto) 2440 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 2441 if (cur->src.neg != prev->src.neg || 2442 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 2443 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 2444 if (cur->src.port[0] != prev->src.port[0] || 2445 cur->src.port[1] != prev->src.port[1] || 2446 cur->src.port_op != prev->src.port_op) 2447 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 2448 if (cur->dst.neg != prev->dst.neg || 2449 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 2450 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 2451 if (cur->dst.port[0] != prev->dst.port[0] || 2452 cur->dst.port[1] != prev->dst.port[1] || 2453 cur->dst.port_op != prev->dst.port_op) 2454 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 2455 2456 prev = cur; 2457 cur = TAILQ_NEXT(cur, entries); 2458 } 2459 for (i = 0; i < PF_SKIP_COUNT; ++i) 2460 PF_SET_SKIP_STEPS(i); 2461 } 2462 2463 int 2464 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 2465 { 2466 if (aw1->type != aw2->type) 2467 return (1); 2468 switch (aw1->type) { 2469 case PF_ADDR_ADDRMASK: 2470 case PF_ADDR_RANGE: 2471 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6)) 2472 return (1); 2473 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6)) 2474 return (1); 2475 return (0); 2476 case PF_ADDR_DYNIFTL: 2477 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 2478 case PF_ADDR_NOROUTE: 2479 case PF_ADDR_URPFFAILED: 2480 return (0); 2481 case PF_ADDR_TABLE: 2482 return (aw1->p.tbl != aw2->p.tbl); 2483 default: 2484 printf("invalid address type: %d\n", aw1->type); 2485 return (1); 2486 } 2487 } 2488 2489 /** 2490 * Checksum updates are a little complicated because the checksum in the TCP/UDP 2491 * header isn't always a full checksum. In some cases (i.e. output) it's a 2492 * pseudo-header checksum, which is a partial checksum over src/dst IP 2493 * addresses, protocol number and length. 2494 * 2495 * That means we have the following cases: 2496 * * Input or forwarding: we don't have TSO, the checksum fields are full 2497 * checksums, we need to update the checksum whenever we change anything. 2498 * * Output (i.e. the checksum is a pseudo-header checksum): 2499 * x The field being updated is src/dst address or affects the length of 2500 * the packet. We need to update the pseudo-header checksum (note that this 2501 * checksum is not ones' complement). 2502 * x Some other field is being modified (e.g. src/dst port numbers): We 2503 * don't have to update anything. 2504 **/ 2505 u_int16_t 2506 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2507 { 2508 u_int32_t x; 2509 2510 x = cksum + old - new; 2511 x = (x + (x >> 16)) & 0xffff; 2512 2513 /* optimise: eliminate a branch when not udp */ 2514 if (udp && cksum == 0x0000) 2515 return cksum; 2516 if (udp && x == 0x0000) 2517 x = 0xffff; 2518 2519 return (u_int16_t)(x); 2520 } 2521 2522 static void 2523 pf_patch_8(struct mbuf *m, u_int16_t *cksum, u_int8_t *f, u_int8_t v, bool hi, 2524 u_int8_t udp) 2525 { 2526 u_int16_t old = htons(hi ? (*f << 8) : *f); 2527 u_int16_t new = htons(hi ? ( v << 8) : v); 2528 2529 if (*f == v) 2530 return; 2531 2532 *f = v; 2533 2534 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2535 return; 2536 2537 *cksum = pf_cksum_fixup(*cksum, old, new, udp); 2538 } 2539 2540 void 2541 pf_patch_16_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int16_t v, 2542 bool hi, u_int8_t udp) 2543 { 2544 u_int8_t *fb = (u_int8_t *)f; 2545 u_int8_t *vb = (u_int8_t *)&v; 2546 2547 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2548 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2549 } 2550 2551 void 2552 pf_patch_32_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int32_t v, 2553 bool hi, u_int8_t udp) 2554 { 2555 u_int8_t *fb = (u_int8_t *)f; 2556 u_int8_t *vb = (u_int8_t *)&v; 2557 2558 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2559 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2560 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2561 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2562 } 2563 2564 u_int16_t 2565 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old, 2566 u_int16_t new, u_int8_t udp) 2567 { 2568 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2569 return (cksum); 2570 2571 return (pf_cksum_fixup(cksum, old, new, udp)); 2572 } 2573 2574 static void 2575 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic, 2576 u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, 2577 sa_family_t af) 2578 { 2579 struct pf_addr ao; 2580 u_int16_t po = *p; 2581 2582 PF_ACPY(&ao, a, af); 2583 PF_ACPY(a, an, af); 2584 2585 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2586 *pc = ~*pc; 2587 2588 *p = pn; 2589 2590 switch (af) { 2591 #ifdef INET 2592 case AF_INET: 2593 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2594 ao.addr16[0], an->addr16[0], 0), 2595 ao.addr16[1], an->addr16[1], 0); 2596 *p = pn; 2597 2598 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc, 2599 ao.addr16[0], an->addr16[0], u), 2600 ao.addr16[1], an->addr16[1], u); 2601 2602 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2603 break; 2604 #endif /* INET */ 2605 #ifdef INET6 2606 case AF_INET6: 2607 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2608 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2609 pf_cksum_fixup(pf_cksum_fixup(*pc, 2610 ao.addr16[0], an->addr16[0], u), 2611 ao.addr16[1], an->addr16[1], u), 2612 ao.addr16[2], an->addr16[2], u), 2613 ao.addr16[3], an->addr16[3], u), 2614 ao.addr16[4], an->addr16[4], u), 2615 ao.addr16[5], an->addr16[5], u), 2616 ao.addr16[6], an->addr16[6], u), 2617 ao.addr16[7], an->addr16[7], u); 2618 2619 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2620 break; 2621 #endif /* INET6 */ 2622 } 2623 2624 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | 2625 CSUM_DELAY_DATA_IPV6)) { 2626 *pc = ~*pc; 2627 if (! *pc) 2628 *pc = 0xffff; 2629 } 2630 } 2631 2632 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2633 void 2634 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2635 { 2636 u_int32_t ao; 2637 2638 memcpy(&ao, a, sizeof(ao)); 2639 memcpy(a, &an, sizeof(u_int32_t)); 2640 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2641 ao % 65536, an % 65536, u); 2642 } 2643 2644 void 2645 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp) 2646 { 2647 u_int32_t ao; 2648 2649 memcpy(&ao, a, sizeof(ao)); 2650 memcpy(a, &an, sizeof(u_int32_t)); 2651 2652 *c = pf_proto_cksum_fixup(m, 2653 pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp), 2654 ao % 65536, an % 65536, udp); 2655 } 2656 2657 #ifdef INET6 2658 static void 2659 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2660 { 2661 struct pf_addr ao; 2662 2663 PF_ACPY(&ao, a, AF_INET6); 2664 PF_ACPY(a, an, AF_INET6); 2665 2666 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2667 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2668 pf_cksum_fixup(pf_cksum_fixup(*c, 2669 ao.addr16[0], an->addr16[0], u), 2670 ao.addr16[1], an->addr16[1], u), 2671 ao.addr16[2], an->addr16[2], u), 2672 ao.addr16[3], an->addr16[3], u), 2673 ao.addr16[4], an->addr16[4], u), 2674 ao.addr16[5], an->addr16[5], u), 2675 ao.addr16[6], an->addr16[6], u), 2676 ao.addr16[7], an->addr16[7], u); 2677 } 2678 #endif /* INET6 */ 2679 2680 static void 2681 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2682 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2683 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2684 { 2685 struct pf_addr oia, ooa; 2686 2687 PF_ACPY(&oia, ia, af); 2688 if (oa) 2689 PF_ACPY(&ooa, oa, af); 2690 2691 /* Change inner protocol port, fix inner protocol checksum. */ 2692 if (ip != NULL) { 2693 u_int16_t oip = *ip; 2694 u_int32_t opc; 2695 2696 if (pc != NULL) 2697 opc = *pc; 2698 *ip = np; 2699 if (pc != NULL) 2700 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2701 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2702 if (pc != NULL) 2703 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2704 } 2705 /* Change inner ip address, fix inner ip and icmp checksums. */ 2706 PF_ACPY(ia, na, af); 2707 switch (af) { 2708 #ifdef INET 2709 case AF_INET: { 2710 u_int32_t oh2c = *h2c; 2711 2712 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2713 oia.addr16[0], ia->addr16[0], 0), 2714 oia.addr16[1], ia->addr16[1], 0); 2715 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2716 oia.addr16[0], ia->addr16[0], 0), 2717 oia.addr16[1], ia->addr16[1], 0); 2718 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2719 break; 2720 } 2721 #endif /* INET */ 2722 #ifdef INET6 2723 case AF_INET6: 2724 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2725 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2726 pf_cksum_fixup(pf_cksum_fixup(*ic, 2727 oia.addr16[0], ia->addr16[0], u), 2728 oia.addr16[1], ia->addr16[1], u), 2729 oia.addr16[2], ia->addr16[2], u), 2730 oia.addr16[3], ia->addr16[3], u), 2731 oia.addr16[4], ia->addr16[4], u), 2732 oia.addr16[5], ia->addr16[5], u), 2733 oia.addr16[6], ia->addr16[6], u), 2734 oia.addr16[7], ia->addr16[7], u); 2735 break; 2736 #endif /* INET6 */ 2737 } 2738 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2739 if (oa) { 2740 PF_ACPY(oa, na, af); 2741 switch (af) { 2742 #ifdef INET 2743 case AF_INET: 2744 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2745 ooa.addr16[0], oa->addr16[0], 0), 2746 ooa.addr16[1], oa->addr16[1], 0); 2747 break; 2748 #endif /* INET */ 2749 #ifdef INET6 2750 case AF_INET6: 2751 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2752 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2753 pf_cksum_fixup(pf_cksum_fixup(*ic, 2754 ooa.addr16[0], oa->addr16[0], u), 2755 ooa.addr16[1], oa->addr16[1], u), 2756 ooa.addr16[2], oa->addr16[2], u), 2757 ooa.addr16[3], oa->addr16[3], u), 2758 ooa.addr16[4], oa->addr16[4], u), 2759 ooa.addr16[5], oa->addr16[5], u), 2760 ooa.addr16[6], oa->addr16[6], u), 2761 ooa.addr16[7], oa->addr16[7], u); 2762 break; 2763 #endif /* INET6 */ 2764 } 2765 } 2766 } 2767 2768 /* 2769 * Need to modulate the sequence numbers in the TCP SACK option 2770 * (credits to Krzysztof Pfaff for report and patch) 2771 */ 2772 static int 2773 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2774 struct tcphdr *th, struct pf_state_peer *dst) 2775 { 2776 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2777 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2778 int copyback = 0, i, olen; 2779 struct sackblk sack; 2780 2781 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2782 if (hlen < TCPOLEN_SACKLEN || 2783 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2784 return 0; 2785 2786 while (hlen >= TCPOLEN_SACKLEN) { 2787 size_t startoff = opt - opts; 2788 olen = opt[1]; 2789 switch (*opt) { 2790 case TCPOPT_EOL: /* FALLTHROUGH */ 2791 case TCPOPT_NOP: 2792 opt++; 2793 hlen--; 2794 break; 2795 case TCPOPT_SACK: 2796 if (olen > hlen) 2797 olen = hlen; 2798 if (olen >= TCPOLEN_SACKLEN) { 2799 for (i = 2; i + TCPOLEN_SACK <= olen; 2800 i += TCPOLEN_SACK) { 2801 memcpy(&sack, &opt[i], sizeof(sack)); 2802 pf_patch_32_unaligned(m, 2803 &th->th_sum, &sack.start, 2804 htonl(ntohl(sack.start) - dst->seqdiff), 2805 PF_ALGNMNT(startoff), 2806 0); 2807 pf_patch_32_unaligned(m, &th->th_sum, 2808 &sack.end, 2809 htonl(ntohl(sack.end) - dst->seqdiff), 2810 PF_ALGNMNT(startoff), 2811 0); 2812 memcpy(&opt[i], &sack, sizeof(sack)); 2813 } 2814 copyback = 1; 2815 } 2816 /* FALLTHROUGH */ 2817 default: 2818 if (olen < 2) 2819 olen = 2; 2820 hlen -= olen; 2821 opt += olen; 2822 } 2823 } 2824 2825 if (copyback) 2826 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2827 return (copyback); 2828 } 2829 2830 struct mbuf * 2831 pf_build_tcp(const struct pf_krule *r, sa_family_t af, 2832 const struct pf_addr *saddr, const struct pf_addr *daddr, 2833 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2834 u_int8_t tcp_flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, 2835 bool skip_firewall, u_int16_t mtag_tag, u_int16_t mtag_flags, int rtableid) 2836 { 2837 struct mbuf *m; 2838 int len, tlen; 2839 #ifdef INET 2840 struct ip *h = NULL; 2841 #endif /* INET */ 2842 #ifdef INET6 2843 struct ip6_hdr *h6 = NULL; 2844 #endif /* INET6 */ 2845 struct tcphdr *th; 2846 char *opt; 2847 struct pf_mtag *pf_mtag; 2848 2849 len = 0; 2850 th = NULL; 2851 2852 /* maximum segment size tcp option */ 2853 tlen = sizeof(struct tcphdr); 2854 if (mss) 2855 tlen += 4; 2856 2857 switch (af) { 2858 #ifdef INET 2859 case AF_INET: 2860 len = sizeof(struct ip) + tlen; 2861 break; 2862 #endif /* INET */ 2863 #ifdef INET6 2864 case AF_INET6: 2865 len = sizeof(struct ip6_hdr) + tlen; 2866 break; 2867 #endif /* INET6 */ 2868 default: 2869 panic("%s: unsupported af %d", __func__, af); 2870 } 2871 2872 m = m_gethdr(M_NOWAIT, MT_DATA); 2873 if (m == NULL) 2874 return (NULL); 2875 2876 #ifdef MAC 2877 mac_netinet_firewall_send(m); 2878 #endif 2879 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2880 m_freem(m); 2881 return (NULL); 2882 } 2883 if (skip_firewall) 2884 m->m_flags |= M_SKIP_FIREWALL; 2885 pf_mtag->tag = mtag_tag; 2886 pf_mtag->flags = mtag_flags; 2887 2888 if (rtableid >= 0) 2889 M_SETFIB(m, rtableid); 2890 2891 #ifdef ALTQ 2892 if (r != NULL && r->qid) { 2893 pf_mtag->qid = r->qid; 2894 2895 /* add hints for ecn */ 2896 pf_mtag->hdr = mtod(m, struct ip *); 2897 } 2898 #endif /* ALTQ */ 2899 m->m_data += max_linkhdr; 2900 m->m_pkthdr.len = m->m_len = len; 2901 /* The rest of the stack assumes a rcvif, so provide one. 2902 * This is a locally generated packet, so .. close enough. */ 2903 m->m_pkthdr.rcvif = V_loif; 2904 bzero(m->m_data, len); 2905 switch (af) { 2906 #ifdef INET 2907 case AF_INET: 2908 h = mtod(m, struct ip *); 2909 2910 /* IP header fields included in the TCP checksum */ 2911 h->ip_p = IPPROTO_TCP; 2912 h->ip_len = htons(tlen); 2913 h->ip_src.s_addr = saddr->v4.s_addr; 2914 h->ip_dst.s_addr = daddr->v4.s_addr; 2915 2916 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2917 break; 2918 #endif /* INET */ 2919 #ifdef INET6 2920 case AF_INET6: 2921 h6 = mtod(m, struct ip6_hdr *); 2922 2923 /* IP header fields included in the TCP checksum */ 2924 h6->ip6_nxt = IPPROTO_TCP; 2925 h6->ip6_plen = htons(tlen); 2926 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2927 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2928 2929 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2930 break; 2931 #endif /* INET6 */ 2932 } 2933 2934 /* TCP header */ 2935 th->th_sport = sport; 2936 th->th_dport = dport; 2937 th->th_seq = htonl(seq); 2938 th->th_ack = htonl(ack); 2939 th->th_off = tlen >> 2; 2940 th->th_flags = tcp_flags; 2941 th->th_win = htons(win); 2942 2943 if (mss) { 2944 opt = (char *)(th + 1); 2945 opt[0] = TCPOPT_MAXSEG; 2946 opt[1] = 4; 2947 HTONS(mss); 2948 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2949 } 2950 2951 switch (af) { 2952 #ifdef INET 2953 case AF_INET: 2954 /* TCP checksum */ 2955 th->th_sum = in_cksum(m, len); 2956 2957 /* Finish the IP header */ 2958 h->ip_v = 4; 2959 h->ip_hl = sizeof(*h) >> 2; 2960 h->ip_tos = IPTOS_LOWDELAY; 2961 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2962 h->ip_len = htons(len); 2963 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2964 h->ip_sum = 0; 2965 break; 2966 #endif /* INET */ 2967 #ifdef INET6 2968 case AF_INET6: 2969 /* TCP checksum */ 2970 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2971 sizeof(struct ip6_hdr), tlen); 2972 2973 h6->ip6_vfc |= IPV6_VERSION; 2974 h6->ip6_hlim = IPV6_DEFHLIM; 2975 break; 2976 #endif /* INET6 */ 2977 } 2978 2979 return (m); 2980 } 2981 2982 static void 2983 pf_send_sctp_abort(sa_family_t af, struct pf_pdesc *pd, 2984 uint8_t ttl, int rtableid) 2985 { 2986 struct mbuf *m; 2987 #ifdef INET 2988 struct ip *h = NULL; 2989 #endif /* INET */ 2990 #ifdef INET6 2991 struct ip6_hdr *h6 = NULL; 2992 #endif /* INET6 */ 2993 struct sctphdr *hdr; 2994 struct sctp_chunkhdr *chunk; 2995 struct pf_send_entry *pfse; 2996 int off = 0; 2997 2998 MPASS(af == pd->af); 2999 3000 m = m_gethdr(M_NOWAIT, MT_DATA); 3001 if (m == NULL) 3002 return; 3003 3004 m->m_data += max_linkhdr; 3005 m->m_flags |= M_SKIP_FIREWALL; 3006 /* The rest of the stack assumes a rcvif, so provide one. 3007 * This is a locally generated packet, so .. close enough. */ 3008 m->m_pkthdr.rcvif = V_loif; 3009 3010 /* IPv4|6 header */ 3011 switch (af) { 3012 #ifdef INET 3013 case AF_INET: 3014 bzero(m->m_data, sizeof(struct ip) + sizeof(*hdr) + sizeof(*chunk)); 3015 3016 h = mtod(m, struct ip *); 3017 3018 /* IP header fields included in the TCP checksum */ 3019 3020 h->ip_p = IPPROTO_SCTP; 3021 h->ip_len = htons(sizeof(*h) + sizeof(*hdr) + sizeof(*chunk)); 3022 h->ip_ttl = ttl ? ttl : V_ip_defttl; 3023 h->ip_src = pd->dst->v4; 3024 h->ip_dst = pd->src->v4; 3025 3026 off += sizeof(struct ip); 3027 break; 3028 #endif /* INET */ 3029 #ifdef INET6 3030 case AF_INET6: 3031 bzero(m->m_data, sizeof(struct ip6_hdr) + sizeof(*hdr) + sizeof(*chunk)); 3032 3033 h6 = mtod(m, struct ip6_hdr *); 3034 3035 /* IP header fields included in the TCP checksum */ 3036 h6->ip6_vfc |= IPV6_VERSION; 3037 h6->ip6_nxt = IPPROTO_SCTP; 3038 h6->ip6_plen = htons(sizeof(*h6) + sizeof(*hdr) + sizeof(*chunk)); 3039 h6->ip6_hlim = ttl ? ttl : V_ip6_defhlim; 3040 memcpy(&h6->ip6_src, &pd->dst->v6, sizeof(struct in6_addr)); 3041 memcpy(&h6->ip6_dst, &pd->src->v6, sizeof(struct in6_addr)); 3042 3043 off += sizeof(struct ip6_hdr); 3044 break; 3045 #endif /* INET6 */ 3046 } 3047 3048 /* SCTP header */ 3049 hdr = mtodo(m, off); 3050 3051 hdr->src_port = pd->hdr.sctp.dest_port; 3052 hdr->dest_port = pd->hdr.sctp.src_port; 3053 hdr->v_tag = pd->sctp_initiate_tag; 3054 hdr->checksum = 0; 3055 3056 /* Abort chunk. */ 3057 off += sizeof(struct sctphdr); 3058 chunk = mtodo(m, off); 3059 3060 chunk->chunk_type = SCTP_ABORT_ASSOCIATION; 3061 chunk->chunk_length = htons(sizeof(*chunk)); 3062 3063 /* SCTP checksum */ 3064 off += sizeof(*chunk); 3065 m->m_pkthdr.len = m->m_len = off; 3066 3067 pf_sctp_checksum(m, off - sizeof(*hdr) - sizeof(*chunk));; 3068 3069 if (rtableid >= 0) 3070 M_SETFIB(m, rtableid); 3071 3072 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3073 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3074 if (pfse == NULL) { 3075 m_freem(m); 3076 return; 3077 } 3078 3079 switch (af) { 3080 #ifdef INET 3081 case AF_INET: 3082 pfse->pfse_type = PFSE_IP; 3083 break; 3084 #endif /* INET */ 3085 #ifdef INET6 3086 case AF_INET6: 3087 pfse->pfse_type = PFSE_IP6; 3088 break; 3089 #endif /* INET6 */ 3090 } 3091 3092 pfse->pfse_m = m; 3093 pf_send(pfse); 3094 } 3095 3096 void 3097 pf_send_tcp(const struct pf_krule *r, sa_family_t af, 3098 const struct pf_addr *saddr, const struct pf_addr *daddr, 3099 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 3100 u_int8_t tcp_flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, 3101 bool skip_firewall, u_int16_t mtag_tag, u_int16_t mtag_flags, int rtableid) 3102 { 3103 struct pf_send_entry *pfse; 3104 struct mbuf *m; 3105 3106 m = pf_build_tcp(r, af, saddr, daddr, sport, dport, seq, ack, tcp_flags, 3107 win, mss, ttl, skip_firewall, mtag_tag, mtag_flags, rtableid); 3108 if (m == NULL) 3109 return; 3110 3111 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3112 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3113 if (pfse == NULL) { 3114 m_freem(m); 3115 return; 3116 } 3117 3118 switch (af) { 3119 #ifdef INET 3120 case AF_INET: 3121 pfse->pfse_type = PFSE_IP; 3122 break; 3123 #endif /* INET */ 3124 #ifdef INET6 3125 case AF_INET6: 3126 pfse->pfse_type = PFSE_IP6; 3127 break; 3128 #endif /* INET6 */ 3129 } 3130 3131 pfse->pfse_m = m; 3132 pf_send(pfse); 3133 } 3134 3135 static void 3136 pf_return(struct pf_krule *r, struct pf_krule *nr, struct pf_pdesc *pd, 3137 struct pf_state_key *sk, int off, struct mbuf *m, struct tcphdr *th, 3138 struct pfi_kkif *kif, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen, 3139 u_short *reason, int rtableid) 3140 { 3141 struct pf_addr * const saddr = pd->src; 3142 struct pf_addr * const daddr = pd->dst; 3143 sa_family_t af = pd->af; 3144 3145 /* undo NAT changes, if they have taken place */ 3146 if (nr != NULL) { 3147 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3148 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3149 if (pd->sport) 3150 *pd->sport = sk->port[pd->sidx]; 3151 if (pd->dport) 3152 *pd->dport = sk->port[pd->didx]; 3153 if (pd->proto_sum) 3154 *pd->proto_sum = bproto_sum; 3155 if (pd->ip_sum) 3156 *pd->ip_sum = bip_sum; 3157 m_copyback(m, off, hdrlen, pd->hdr.any); 3158 } 3159 if (pd->proto == IPPROTO_TCP && 3160 ((r->rule_flag & PFRULE_RETURNRST) || 3161 (r->rule_flag & PFRULE_RETURN)) && 3162 !(th->th_flags & TH_RST)) { 3163 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3164 int len = 0; 3165 #ifdef INET 3166 struct ip *h4; 3167 #endif 3168 #ifdef INET6 3169 struct ip6_hdr *h6; 3170 #endif 3171 3172 switch (af) { 3173 #ifdef INET 3174 case AF_INET: 3175 h4 = mtod(m, struct ip *); 3176 len = ntohs(h4->ip_len) - off; 3177 break; 3178 #endif 3179 #ifdef INET6 3180 case AF_INET6: 3181 h6 = mtod(m, struct ip6_hdr *); 3182 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3183 break; 3184 #endif 3185 } 3186 3187 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3188 REASON_SET(reason, PFRES_PROTCKSUM); 3189 else { 3190 if (th->th_flags & TH_SYN) 3191 ack++; 3192 if (th->th_flags & TH_FIN) 3193 ack++; 3194 pf_send_tcp(r, af, pd->dst, 3195 pd->src, th->th_dport, th->th_sport, 3196 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3197 r->return_ttl, true, 0, 0, rtableid); 3198 } 3199 } else if (pd->proto == IPPROTO_SCTP && 3200 (r->rule_flag & PFRULE_RETURN)) { 3201 pf_send_sctp_abort(af, pd, r->return_ttl, rtableid); 3202 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3203 r->return_icmp) 3204 pf_send_icmp(m, r->return_icmp >> 8, 3205 r->return_icmp & 255, af, r, rtableid); 3206 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3207 r->return_icmp6) 3208 pf_send_icmp(m, r->return_icmp6 >> 8, 3209 r->return_icmp6 & 255, af, r, rtableid); 3210 } 3211 3212 static int 3213 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m) 3214 { 3215 struct m_tag *mtag; 3216 u_int8_t mpcp; 3217 3218 mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL); 3219 if (mtag == NULL) 3220 return (0); 3221 3222 if (prio == PF_PRIO_ZERO) 3223 prio = 0; 3224 3225 mpcp = *(uint8_t *)(mtag + 1); 3226 3227 return (mpcp == prio); 3228 } 3229 3230 static int 3231 pf_icmp_to_bandlim(uint8_t type) 3232 { 3233 switch (type) { 3234 case ICMP_ECHO: 3235 case ICMP_ECHOREPLY: 3236 return (BANDLIM_ICMP_ECHO); 3237 case ICMP_TSTAMP: 3238 case ICMP_TSTAMPREPLY: 3239 return (BANDLIM_ICMP_TSTAMP); 3240 case ICMP_UNREACH: 3241 default: 3242 return (BANDLIM_ICMP_UNREACH); 3243 } 3244 } 3245 3246 static void 3247 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 3248 struct pf_krule *r, int rtableid) 3249 { 3250 struct pf_send_entry *pfse; 3251 struct mbuf *m0; 3252 struct pf_mtag *pf_mtag; 3253 3254 /* ICMP packet rate limitation. */ 3255 #ifdef INET6 3256 if (af == AF_INET6) { 3257 if (icmp6_ratelimit(NULL, type, code)) 3258 return; 3259 } 3260 #endif 3261 #ifdef INET 3262 if (af == AF_INET) { 3263 if (badport_bandlim(pf_icmp_to_bandlim(type)) != 0) 3264 return; 3265 } 3266 #endif 3267 3268 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3269 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3270 if (pfse == NULL) 3271 return; 3272 3273 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 3274 free(pfse, M_PFTEMP); 3275 return; 3276 } 3277 3278 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 3279 free(pfse, M_PFTEMP); 3280 return; 3281 } 3282 /* XXX: revisit */ 3283 m0->m_flags |= M_SKIP_FIREWALL; 3284 3285 if (rtableid >= 0) 3286 M_SETFIB(m0, rtableid); 3287 3288 #ifdef ALTQ 3289 if (r->qid) { 3290 pf_mtag->qid = r->qid; 3291 /* add hints for ecn */ 3292 pf_mtag->hdr = mtod(m0, struct ip *); 3293 } 3294 #endif /* ALTQ */ 3295 3296 switch (af) { 3297 #ifdef INET 3298 case AF_INET: 3299 pfse->pfse_type = PFSE_ICMP; 3300 break; 3301 #endif /* INET */ 3302 #ifdef INET6 3303 case AF_INET6: 3304 pfse->pfse_type = PFSE_ICMP6; 3305 break; 3306 #endif /* INET6 */ 3307 } 3308 pfse->pfse_m = m0; 3309 pfse->icmpopts.type = type; 3310 pfse->icmpopts.code = code; 3311 pf_send(pfse); 3312 } 3313 3314 /* 3315 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 3316 * If n is 0, they match if they are equal. If n is != 0, they match if they 3317 * are different. 3318 */ 3319 int 3320 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 3321 struct pf_addr *b, sa_family_t af) 3322 { 3323 int match = 0; 3324 3325 switch (af) { 3326 #ifdef INET 3327 case AF_INET: 3328 if ((a->addr32[0] & m->addr32[0]) == 3329 (b->addr32[0] & m->addr32[0])) 3330 match++; 3331 break; 3332 #endif /* INET */ 3333 #ifdef INET6 3334 case AF_INET6: 3335 if (((a->addr32[0] & m->addr32[0]) == 3336 (b->addr32[0] & m->addr32[0])) && 3337 ((a->addr32[1] & m->addr32[1]) == 3338 (b->addr32[1] & m->addr32[1])) && 3339 ((a->addr32[2] & m->addr32[2]) == 3340 (b->addr32[2] & m->addr32[2])) && 3341 ((a->addr32[3] & m->addr32[3]) == 3342 (b->addr32[3] & m->addr32[3]))) 3343 match++; 3344 break; 3345 #endif /* INET6 */ 3346 } 3347 if (match) { 3348 if (n) 3349 return (0); 3350 else 3351 return (1); 3352 } else { 3353 if (n) 3354 return (1); 3355 else 3356 return (0); 3357 } 3358 } 3359 3360 /* 3361 * Return 1 if b <= a <= e, otherwise return 0. 3362 */ 3363 int 3364 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 3365 struct pf_addr *a, sa_family_t af) 3366 { 3367 switch (af) { 3368 #ifdef INET 3369 case AF_INET: 3370 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) || 3371 (ntohl(a->addr32[0]) > ntohl(e->addr32[0]))) 3372 return (0); 3373 break; 3374 #endif /* INET */ 3375 #ifdef INET6 3376 case AF_INET6: { 3377 int i; 3378 3379 /* check a >= b */ 3380 for (i = 0; i < 4; ++i) 3381 if (ntohl(a->addr32[i]) > ntohl(b->addr32[i])) 3382 break; 3383 else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i])) 3384 return (0); 3385 /* check a <= e */ 3386 for (i = 0; i < 4; ++i) 3387 if (ntohl(a->addr32[i]) < ntohl(e->addr32[i])) 3388 break; 3389 else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i])) 3390 return (0); 3391 break; 3392 } 3393 #endif /* INET6 */ 3394 } 3395 return (1); 3396 } 3397 3398 static int 3399 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 3400 { 3401 switch (op) { 3402 case PF_OP_IRG: 3403 return ((p > a1) && (p < a2)); 3404 case PF_OP_XRG: 3405 return ((p < a1) || (p > a2)); 3406 case PF_OP_RRG: 3407 return ((p >= a1) && (p <= a2)); 3408 case PF_OP_EQ: 3409 return (p == a1); 3410 case PF_OP_NE: 3411 return (p != a1); 3412 case PF_OP_LT: 3413 return (p < a1); 3414 case PF_OP_LE: 3415 return (p <= a1); 3416 case PF_OP_GT: 3417 return (p > a1); 3418 case PF_OP_GE: 3419 return (p >= a1); 3420 } 3421 return (0); /* never reached */ 3422 } 3423 3424 int 3425 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 3426 { 3427 NTOHS(a1); 3428 NTOHS(a2); 3429 NTOHS(p); 3430 return (pf_match(op, a1, a2, p)); 3431 } 3432 3433 static int 3434 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 3435 { 3436 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 3437 return (0); 3438 return (pf_match(op, a1, a2, u)); 3439 } 3440 3441 static int 3442 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 3443 { 3444 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 3445 return (0); 3446 return (pf_match(op, a1, a2, g)); 3447 } 3448 3449 int 3450 pf_match_tag(struct mbuf *m, struct pf_krule *r, int *tag, int mtag) 3451 { 3452 if (*tag == -1) 3453 *tag = mtag; 3454 3455 return ((!r->match_tag_not && r->match_tag == *tag) || 3456 (r->match_tag_not && r->match_tag != *tag)); 3457 } 3458 3459 int 3460 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 3461 { 3462 3463 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 3464 3465 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 3466 return (ENOMEM); 3467 3468 pd->pf_mtag->tag = tag; 3469 3470 return (0); 3471 } 3472 3473 #define PF_ANCHOR_STACKSIZE 32 3474 struct pf_kanchor_stackframe { 3475 struct pf_kruleset *rs; 3476 struct pf_krule *r; /* XXX: + match bit */ 3477 struct pf_kanchor *child; 3478 }; 3479 3480 /* 3481 * XXX: We rely on malloc(9) returning pointer aligned addresses. 3482 */ 3483 #define PF_ANCHORSTACK_MATCH 0x00000001 3484 #define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 3485 3486 #define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 3487 #define PF_ANCHOR_RULE(f) (struct pf_krule *) \ 3488 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 3489 #define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 3490 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 3491 } while (0) 3492 3493 void 3494 pf_step_into_anchor(struct pf_kanchor_stackframe *stack, int *depth, 3495 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, 3496 int *match) 3497 { 3498 struct pf_kanchor_stackframe *f; 3499 3500 PF_RULES_RASSERT(); 3501 3502 if (match) 3503 *match = 0; 3504 if (*depth >= PF_ANCHOR_STACKSIZE) { 3505 printf("%s: anchor stack overflow on %s\n", 3506 __func__, (*r)->anchor->name); 3507 *r = TAILQ_NEXT(*r, entries); 3508 return; 3509 } else if (*depth == 0 && a != NULL) 3510 *a = *r; 3511 f = stack + (*depth)++; 3512 f->rs = *rs; 3513 f->r = *r; 3514 if ((*r)->anchor_wildcard) { 3515 struct pf_kanchor_node *parent = &(*r)->anchor->children; 3516 3517 if ((f->child = RB_MIN(pf_kanchor_node, parent)) == NULL) { 3518 *r = NULL; 3519 return; 3520 } 3521 *rs = &f->child->ruleset; 3522 } else { 3523 f->child = NULL; 3524 *rs = &(*r)->anchor->ruleset; 3525 } 3526 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 3527 } 3528 3529 int 3530 pf_step_out_of_anchor(struct pf_kanchor_stackframe *stack, int *depth, 3531 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, 3532 int *match) 3533 { 3534 struct pf_kanchor_stackframe *f; 3535 struct pf_krule *fr; 3536 int quick = 0; 3537 3538 PF_RULES_RASSERT(); 3539 3540 do { 3541 if (*depth <= 0) 3542 break; 3543 f = stack + *depth - 1; 3544 fr = PF_ANCHOR_RULE(f); 3545 if (f->child != NULL) { 3546 /* 3547 * This block traverses through 3548 * a wildcard anchor. 3549 */ 3550 if (match != NULL && *match) { 3551 /* 3552 * If any of "*" matched, then 3553 * "foo/ *" matched, mark frame 3554 * appropriately. 3555 */ 3556 PF_ANCHOR_SET_MATCH(f); 3557 *match = 0; 3558 } 3559 f->child = RB_NEXT(pf_kanchor_node, 3560 &fr->anchor->children, f->child); 3561 if (f->child != NULL) { 3562 *rs = &f->child->ruleset; 3563 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 3564 if (*r == NULL) 3565 continue; 3566 else 3567 break; 3568 } 3569 } 3570 (*depth)--; 3571 if (*depth == 0 && a != NULL) 3572 *a = NULL; 3573 *rs = f->rs; 3574 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 3575 quick = fr->quick; 3576 *r = TAILQ_NEXT(fr, entries); 3577 } while (*r == NULL); 3578 3579 return (quick); 3580 } 3581 3582 struct pf_keth_anchor_stackframe { 3583 struct pf_keth_ruleset *rs; 3584 struct pf_keth_rule *r; /* XXX: + match bit */ 3585 struct pf_keth_anchor *child; 3586 }; 3587 3588 #define PF_ETH_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 3589 #define PF_ETH_ANCHOR_RULE(f) (struct pf_keth_rule *) \ 3590 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 3591 #define PF_ETH_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 3592 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 3593 } while (0) 3594 3595 void 3596 pf_step_into_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth, 3597 struct pf_keth_ruleset **rs, struct pf_keth_rule **r, 3598 struct pf_keth_rule **a, int *match) 3599 { 3600 struct pf_keth_anchor_stackframe *f; 3601 3602 NET_EPOCH_ASSERT(); 3603 3604 if (match) 3605 *match = 0; 3606 if (*depth >= PF_ANCHOR_STACKSIZE) { 3607 printf("%s: anchor stack overflow on %s\n", 3608 __func__, (*r)->anchor->name); 3609 *r = TAILQ_NEXT(*r, entries); 3610 return; 3611 } else if (*depth == 0 && a != NULL) 3612 *a = *r; 3613 f = stack + (*depth)++; 3614 f->rs = *rs; 3615 f->r = *r; 3616 if ((*r)->anchor_wildcard) { 3617 struct pf_keth_anchor_node *parent = &(*r)->anchor->children; 3618 3619 if ((f->child = RB_MIN(pf_keth_anchor_node, parent)) == NULL) { 3620 *r = NULL; 3621 return; 3622 } 3623 *rs = &f->child->ruleset; 3624 } else { 3625 f->child = NULL; 3626 *rs = &(*r)->anchor->ruleset; 3627 } 3628 *r = TAILQ_FIRST((*rs)->active.rules); 3629 } 3630 3631 int 3632 pf_step_out_of_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth, 3633 struct pf_keth_ruleset **rs, struct pf_keth_rule **r, 3634 struct pf_keth_rule **a, int *match) 3635 { 3636 struct pf_keth_anchor_stackframe *f; 3637 struct pf_keth_rule *fr; 3638 int quick = 0; 3639 3640 NET_EPOCH_ASSERT(); 3641 3642 do { 3643 if (*depth <= 0) 3644 break; 3645 f = stack + *depth - 1; 3646 fr = PF_ETH_ANCHOR_RULE(f); 3647 if (f->child != NULL) { 3648 /* 3649 * This block traverses through 3650 * a wildcard anchor. 3651 */ 3652 if (match != NULL && *match) { 3653 /* 3654 * If any of "*" matched, then 3655 * "foo/ *" matched, mark frame 3656 * appropriately. 3657 */ 3658 PF_ETH_ANCHOR_SET_MATCH(f); 3659 *match = 0; 3660 } 3661 f->child = RB_NEXT(pf_keth_anchor_node, 3662 &fr->anchor->children, f->child); 3663 if (f->child != NULL) { 3664 *rs = &f->child->ruleset; 3665 *r = TAILQ_FIRST((*rs)->active.rules); 3666 if (*r == NULL) 3667 continue; 3668 else 3669 break; 3670 } 3671 } 3672 (*depth)--; 3673 if (*depth == 0 && a != NULL) 3674 *a = NULL; 3675 *rs = f->rs; 3676 if (PF_ETH_ANCHOR_MATCH(f) || (match != NULL && *match)) 3677 quick = fr->quick; 3678 *r = TAILQ_NEXT(fr, entries); 3679 } while (*r == NULL); 3680 3681 return (quick); 3682 } 3683 3684 #ifdef INET6 3685 void 3686 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 3687 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 3688 { 3689 switch (af) { 3690 #ifdef INET 3691 case AF_INET: 3692 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3693 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3694 break; 3695 #endif /* INET */ 3696 case AF_INET6: 3697 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3698 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3699 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 3700 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 3701 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 3702 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 3703 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 3704 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 3705 break; 3706 } 3707 } 3708 3709 void 3710 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 3711 { 3712 switch (af) { 3713 #ifdef INET 3714 case AF_INET: 3715 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 3716 break; 3717 #endif /* INET */ 3718 case AF_INET6: 3719 if (addr->addr32[3] == 0xffffffff) { 3720 addr->addr32[3] = 0; 3721 if (addr->addr32[2] == 0xffffffff) { 3722 addr->addr32[2] = 0; 3723 if (addr->addr32[1] == 0xffffffff) { 3724 addr->addr32[1] = 0; 3725 addr->addr32[0] = 3726 htonl(ntohl(addr->addr32[0]) + 1); 3727 } else 3728 addr->addr32[1] = 3729 htonl(ntohl(addr->addr32[1]) + 1); 3730 } else 3731 addr->addr32[2] = 3732 htonl(ntohl(addr->addr32[2]) + 1); 3733 } else 3734 addr->addr32[3] = 3735 htonl(ntohl(addr->addr32[3]) + 1); 3736 break; 3737 } 3738 } 3739 #endif /* INET6 */ 3740 3741 void 3742 pf_rule_to_actions(struct pf_krule *r, struct pf_rule_actions *a) 3743 { 3744 /* 3745 * Modern rules use the same flags in rules as they do in states. 3746 */ 3747 a->flags |= (r->scrub_flags & (PFSTATE_NODF|PFSTATE_RANDOMID| 3748 PFSTATE_SCRUB_TCP|PFSTATE_SETPRIO)); 3749 3750 /* 3751 * Old-style scrub rules have different flags which need to be translated. 3752 */ 3753 if (r->rule_flag & PFRULE_RANDOMID) 3754 a->flags |= PFSTATE_RANDOMID; 3755 if (r->scrub_flags & PFSTATE_SETTOS || r->rule_flag & PFRULE_SET_TOS ) { 3756 a->flags |= PFSTATE_SETTOS; 3757 a->set_tos = r->set_tos; 3758 } 3759 3760 if (r->qid) 3761 a->qid = r->qid; 3762 if (r->pqid) 3763 a->pqid = r->pqid; 3764 if (r->rtableid >= 0) 3765 a->rtableid = r->rtableid; 3766 a->log |= r->log; 3767 if (r->min_ttl) 3768 a->min_ttl = r->min_ttl; 3769 if (r->max_mss) 3770 a->max_mss = r->max_mss; 3771 if (r->dnpipe) 3772 a->dnpipe = r->dnpipe; 3773 if (r->dnrpipe) 3774 a->dnrpipe = r->dnrpipe; 3775 if (r->dnpipe || r->dnrpipe) { 3776 if (r->free_flags & PFRULE_DN_IS_PIPE) 3777 a->flags |= PFSTATE_DN_IS_PIPE; 3778 else 3779 a->flags &= ~PFSTATE_DN_IS_PIPE; 3780 } 3781 if (r->scrub_flags & PFSTATE_SETPRIO) { 3782 a->set_prio[0] = r->set_prio[0]; 3783 a->set_prio[1] = r->set_prio[1]; 3784 } 3785 } 3786 3787 int 3788 pf_socket_lookup(struct pf_pdesc *pd, struct mbuf *m) 3789 { 3790 struct pf_addr *saddr, *daddr; 3791 u_int16_t sport, dport; 3792 struct inpcbinfo *pi; 3793 struct inpcb *inp; 3794 3795 pd->lookup.uid = UID_MAX; 3796 pd->lookup.gid = GID_MAX; 3797 3798 switch (pd->proto) { 3799 case IPPROTO_TCP: 3800 sport = pd->hdr.tcp.th_sport; 3801 dport = pd->hdr.tcp.th_dport; 3802 pi = &V_tcbinfo; 3803 break; 3804 case IPPROTO_UDP: 3805 sport = pd->hdr.udp.uh_sport; 3806 dport = pd->hdr.udp.uh_dport; 3807 pi = &V_udbinfo; 3808 break; 3809 default: 3810 return (-1); 3811 } 3812 if (pd->dir == PF_IN) { 3813 saddr = pd->src; 3814 daddr = pd->dst; 3815 } else { 3816 u_int16_t p; 3817 3818 p = sport; 3819 sport = dport; 3820 dport = p; 3821 saddr = pd->dst; 3822 daddr = pd->src; 3823 } 3824 switch (pd->af) { 3825 #ifdef INET 3826 case AF_INET: 3827 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 3828 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3829 if (inp == NULL) { 3830 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 3831 daddr->v4, dport, INPLOOKUP_WILDCARD | 3832 INPLOOKUP_RLOCKPCB, NULL, m); 3833 if (inp == NULL) 3834 return (-1); 3835 } 3836 break; 3837 #endif /* INET */ 3838 #ifdef INET6 3839 case AF_INET6: 3840 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 3841 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3842 if (inp == NULL) { 3843 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 3844 &daddr->v6, dport, INPLOOKUP_WILDCARD | 3845 INPLOOKUP_RLOCKPCB, NULL, m); 3846 if (inp == NULL) 3847 return (-1); 3848 } 3849 break; 3850 #endif /* INET6 */ 3851 3852 default: 3853 return (-1); 3854 } 3855 INP_RLOCK_ASSERT(inp); 3856 pd->lookup.uid = inp->inp_cred->cr_uid; 3857 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3858 INP_RUNLOCK(inp); 3859 3860 return (1); 3861 } 3862 3863 u_int8_t 3864 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3865 { 3866 int hlen; 3867 u_int8_t hdr[60]; 3868 u_int8_t *opt, optlen; 3869 u_int8_t wscale = 0; 3870 3871 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3872 if (hlen <= sizeof(struct tcphdr)) 3873 return (0); 3874 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3875 return (0); 3876 opt = hdr + sizeof(struct tcphdr); 3877 hlen -= sizeof(struct tcphdr); 3878 while (hlen >= 3) { 3879 switch (*opt) { 3880 case TCPOPT_EOL: 3881 case TCPOPT_NOP: 3882 ++opt; 3883 --hlen; 3884 break; 3885 case TCPOPT_WINDOW: 3886 wscale = opt[2]; 3887 if (wscale > TCP_MAX_WINSHIFT) 3888 wscale = TCP_MAX_WINSHIFT; 3889 wscale |= PF_WSCALE_FLAG; 3890 /* FALLTHROUGH */ 3891 default: 3892 optlen = opt[1]; 3893 if (optlen < 2) 3894 optlen = 2; 3895 hlen -= optlen; 3896 opt += optlen; 3897 break; 3898 } 3899 } 3900 return (wscale); 3901 } 3902 3903 u_int16_t 3904 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3905 { 3906 int hlen; 3907 u_int8_t hdr[60]; 3908 u_int8_t *opt, optlen; 3909 u_int16_t mss = V_tcp_mssdflt; 3910 3911 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3912 if (hlen <= sizeof(struct tcphdr)) 3913 return (0); 3914 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3915 return (0); 3916 opt = hdr + sizeof(struct tcphdr); 3917 hlen -= sizeof(struct tcphdr); 3918 while (hlen >= TCPOLEN_MAXSEG) { 3919 switch (*opt) { 3920 case TCPOPT_EOL: 3921 case TCPOPT_NOP: 3922 ++opt; 3923 --hlen; 3924 break; 3925 case TCPOPT_MAXSEG: 3926 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3927 NTOHS(mss); 3928 /* FALLTHROUGH */ 3929 default: 3930 optlen = opt[1]; 3931 if (optlen < 2) 3932 optlen = 2; 3933 hlen -= optlen; 3934 opt += optlen; 3935 break; 3936 } 3937 } 3938 return (mss); 3939 } 3940 3941 static u_int16_t 3942 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 3943 { 3944 struct nhop_object *nh; 3945 #ifdef INET6 3946 struct in6_addr dst6; 3947 uint32_t scopeid; 3948 #endif /* INET6 */ 3949 int hlen = 0; 3950 uint16_t mss = 0; 3951 3952 NET_EPOCH_ASSERT(); 3953 3954 switch (af) { 3955 #ifdef INET 3956 case AF_INET: 3957 hlen = sizeof(struct ip); 3958 nh = fib4_lookup(rtableid, addr->v4, 0, 0, 0); 3959 if (nh != NULL) 3960 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 3961 break; 3962 #endif /* INET */ 3963 #ifdef INET6 3964 case AF_INET6: 3965 hlen = sizeof(struct ip6_hdr); 3966 in6_splitscope(&addr->v6, &dst6, &scopeid); 3967 nh = fib6_lookup(rtableid, &dst6, scopeid, 0, 0); 3968 if (nh != NULL) 3969 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 3970 break; 3971 #endif /* INET6 */ 3972 } 3973 3974 mss = max(V_tcp_mssdflt, mss); 3975 mss = min(mss, offer); 3976 mss = max(mss, 64); /* sanity - at least max opt space */ 3977 return (mss); 3978 } 3979 3980 static u_int32_t 3981 pf_tcp_iss(struct pf_pdesc *pd) 3982 { 3983 MD5_CTX ctx; 3984 u_int32_t digest[4]; 3985 3986 if (V_pf_tcp_secret_init == 0) { 3987 arc4random_buf(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 3988 MD5Init(&V_pf_tcp_secret_ctx); 3989 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 3990 sizeof(V_pf_tcp_secret)); 3991 V_pf_tcp_secret_init = 1; 3992 } 3993 3994 ctx = V_pf_tcp_secret_ctx; 3995 3996 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_sport, sizeof(u_short)); 3997 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_dport, sizeof(u_short)); 3998 if (pd->af == AF_INET6) { 3999 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 4000 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 4001 } else { 4002 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 4003 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 4004 } 4005 MD5Final((u_char *)digest, &ctx); 4006 V_pf_tcp_iss_off += 4096; 4007 #define ISN_RANDOM_INCREMENT (4096 - 1) 4008 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 4009 V_pf_tcp_iss_off); 4010 #undef ISN_RANDOM_INCREMENT 4011 } 4012 4013 static bool 4014 pf_match_eth_addr(const uint8_t *a, const struct pf_keth_rule_addr *r) 4015 { 4016 bool match = true; 4017 4018 /* Always matches if not set */ 4019 if (! r->isset) 4020 return (!r->neg); 4021 4022 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4023 if ((a[i] & r->mask[i]) != (r->addr[i] & r->mask[i])) { 4024 match = false; 4025 break; 4026 } 4027 } 4028 4029 return (match ^ r->neg); 4030 } 4031 4032 static int 4033 pf_match_eth_tag(struct mbuf *m, struct pf_keth_rule *r, int *tag, int mtag) 4034 { 4035 if (*tag == -1) 4036 *tag = mtag; 4037 4038 return ((!r->match_tag_not && r->match_tag == *tag) || 4039 (r->match_tag_not && r->match_tag != *tag)); 4040 } 4041 4042 static void 4043 pf_bridge_to(struct ifnet *ifp, struct mbuf *m) 4044 { 4045 /* If we don't have the interface drop the packet. */ 4046 if (ifp == NULL) { 4047 m_freem(m); 4048 return; 4049 } 4050 4051 switch (ifp->if_type) { 4052 case IFT_ETHER: 4053 case IFT_XETHER: 4054 case IFT_L2VLAN: 4055 case IFT_BRIDGE: 4056 case IFT_IEEE8023ADLAG: 4057 break; 4058 default: 4059 m_freem(m); 4060 return; 4061 } 4062 4063 ifp->if_transmit(ifp, m); 4064 } 4065 4066 static int 4067 pf_test_eth_rule(int dir, struct pfi_kkif *kif, struct mbuf **m0) 4068 { 4069 #ifdef INET 4070 struct ip ip; 4071 #endif 4072 #ifdef INET6 4073 struct ip6_hdr ip6; 4074 #endif 4075 struct mbuf *m = *m0; 4076 struct ether_header *e; 4077 struct pf_keth_rule *r, *rm, *a = NULL; 4078 struct pf_keth_ruleset *ruleset = NULL; 4079 struct pf_mtag *mtag; 4080 struct pf_keth_ruleq *rules; 4081 struct pf_addr *src = NULL, *dst = NULL; 4082 struct pfi_kkif *bridge_to; 4083 sa_family_t af = 0; 4084 uint16_t proto; 4085 int asd = 0, match = 0; 4086 int tag = -1; 4087 uint8_t action; 4088 struct pf_keth_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 4089 4090 MPASS(kif->pfik_ifp->if_vnet == curvnet); 4091 NET_EPOCH_ASSERT(); 4092 4093 PF_RULES_RLOCK_TRACKER; 4094 4095 SDT_PROBE3(pf, eth, test_rule, entry, dir, kif->pfik_ifp, m); 4096 4097 mtag = pf_find_mtag(m); 4098 if (mtag != NULL && mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 4099 /* Dummynet re-injects packets after they've 4100 * completed their delay. We've already 4101 * processed them, so pass unconditionally. */ 4102 4103 /* But only once. We may see the packet multiple times (e.g. 4104 * PFIL_IN/PFIL_OUT). */ 4105 mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 4106 4107 return (PF_PASS); 4108 } 4109 4110 ruleset = V_pf_keth; 4111 rules = ck_pr_load_ptr(&ruleset->active.rules); 4112 r = TAILQ_FIRST(rules); 4113 rm = NULL; 4114 4115 e = mtod(m, struct ether_header *); 4116 proto = ntohs(e->ether_type); 4117 4118 switch (proto) { 4119 #ifdef INET 4120 case ETHERTYPE_IP: { 4121 if (m_length(m, NULL) < (sizeof(struct ether_header) + 4122 sizeof(ip))) 4123 return (PF_DROP); 4124 4125 af = AF_INET; 4126 m_copydata(m, sizeof(struct ether_header), sizeof(ip), 4127 (caddr_t)&ip); 4128 src = (struct pf_addr *)&ip.ip_src; 4129 dst = (struct pf_addr *)&ip.ip_dst; 4130 break; 4131 } 4132 #endif /* INET */ 4133 #ifdef INET6 4134 case ETHERTYPE_IPV6: { 4135 if (m_length(m, NULL) < (sizeof(struct ether_header) + 4136 sizeof(ip6))) 4137 return (PF_DROP); 4138 4139 af = AF_INET6; 4140 m_copydata(m, sizeof(struct ether_header), sizeof(ip6), 4141 (caddr_t)&ip6); 4142 src = (struct pf_addr *)&ip6.ip6_src; 4143 dst = (struct pf_addr *)&ip6.ip6_dst; 4144 break; 4145 } 4146 #endif /* INET6 */ 4147 } 4148 4149 PF_RULES_RLOCK(); 4150 4151 while (r != NULL) { 4152 counter_u64_add(r->evaluations, 1); 4153 SDT_PROBE2(pf, eth, test_rule, test, r->nr, r); 4154 4155 if (pfi_kkif_match(r->kif, kif) == r->ifnot) { 4156 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4157 "kif"); 4158 r = r->skip[PFE_SKIP_IFP].ptr; 4159 } 4160 else if (r->direction && r->direction != dir) { 4161 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4162 "dir"); 4163 r = r->skip[PFE_SKIP_DIR].ptr; 4164 } 4165 else if (r->proto && r->proto != proto) { 4166 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4167 "proto"); 4168 r = r->skip[PFE_SKIP_PROTO].ptr; 4169 } 4170 else if (! pf_match_eth_addr(e->ether_shost, &r->src)) { 4171 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4172 "src"); 4173 r = r->skip[PFE_SKIP_SRC_ADDR].ptr; 4174 } 4175 else if (! pf_match_eth_addr(e->ether_dhost, &r->dst)) { 4176 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4177 "dst"); 4178 r = r->skip[PFE_SKIP_DST_ADDR].ptr; 4179 } 4180 else if (src != NULL && PF_MISMATCHAW(&r->ipsrc.addr, src, af, 4181 r->ipsrc.neg, kif, M_GETFIB(m))) { 4182 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4183 "ip_src"); 4184 r = r->skip[PFE_SKIP_SRC_IP_ADDR].ptr; 4185 } 4186 else if (dst != NULL && PF_MISMATCHAW(&r->ipdst.addr, dst, af, 4187 r->ipdst.neg, kif, M_GETFIB(m))) { 4188 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4189 "ip_dst"); 4190 r = r->skip[PFE_SKIP_DST_IP_ADDR].ptr; 4191 } 4192 else if (r->match_tag && !pf_match_eth_tag(m, r, &tag, 4193 mtag ? mtag->tag : 0)) { 4194 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4195 "match_tag"); 4196 r = TAILQ_NEXT(r, entries); 4197 } 4198 else { 4199 if (r->tag) 4200 tag = r->tag; 4201 if (r->anchor == NULL) { 4202 /* Rule matches */ 4203 rm = r; 4204 4205 SDT_PROBE2(pf, eth, test_rule, match, r->nr, r); 4206 4207 if (r->quick) 4208 break; 4209 4210 r = TAILQ_NEXT(r, entries); 4211 } else { 4212 pf_step_into_keth_anchor(anchor_stack, &asd, 4213 &ruleset, &r, &a, &match); 4214 } 4215 } 4216 if (r == NULL && pf_step_out_of_keth_anchor(anchor_stack, &asd, 4217 &ruleset, &r, &a, &match)) 4218 break; 4219 } 4220 4221 r = rm; 4222 4223 SDT_PROBE2(pf, eth, test_rule, final_match, (r != NULL ? r->nr : -1), r); 4224 4225 /* Default to pass. */ 4226 if (r == NULL) { 4227 PF_RULES_RUNLOCK(); 4228 return (PF_PASS); 4229 } 4230 4231 /* Execute action. */ 4232 counter_u64_add(r->packets[dir == PF_OUT], 1); 4233 counter_u64_add(r->bytes[dir == PF_OUT], m_length(m, NULL)); 4234 pf_update_timestamp(r); 4235 4236 /* Shortcut. Don't tag if we're just going to drop anyway. */ 4237 if (r->action == PF_DROP) { 4238 PF_RULES_RUNLOCK(); 4239 return (PF_DROP); 4240 } 4241 4242 if (tag > 0) { 4243 if (mtag == NULL) 4244 mtag = pf_get_mtag(m); 4245 if (mtag == NULL) { 4246 PF_RULES_RUNLOCK(); 4247 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4248 return (PF_DROP); 4249 } 4250 mtag->tag = tag; 4251 } 4252 4253 if (r->qid != 0) { 4254 if (mtag == NULL) 4255 mtag = pf_get_mtag(m); 4256 if (mtag == NULL) { 4257 PF_RULES_RUNLOCK(); 4258 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4259 return (PF_DROP); 4260 } 4261 mtag->qid = r->qid; 4262 } 4263 4264 action = r->action; 4265 bridge_to = r->bridge_to; 4266 4267 /* Dummynet */ 4268 if (r->dnpipe) { 4269 struct ip_fw_args dnflow; 4270 4271 /* Drop packet if dummynet is not loaded. */ 4272 if (ip_dn_io_ptr == NULL) { 4273 PF_RULES_RUNLOCK(); 4274 m_freem(m); 4275 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4276 return (PF_DROP); 4277 } 4278 if (mtag == NULL) 4279 mtag = pf_get_mtag(m); 4280 if (mtag == NULL) { 4281 PF_RULES_RUNLOCK(); 4282 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4283 return (PF_DROP); 4284 } 4285 4286 bzero(&dnflow, sizeof(dnflow)); 4287 4288 /* We don't have port numbers here, so we set 0. That means 4289 * that we'll be somewhat limited in distinguishing flows (i.e. 4290 * only based on IP addresses, not based on port numbers), but 4291 * it's better than nothing. */ 4292 dnflow.f_id.dst_port = 0; 4293 dnflow.f_id.src_port = 0; 4294 dnflow.f_id.proto = 0; 4295 4296 dnflow.rule.info = r->dnpipe; 4297 dnflow.rule.info |= IPFW_IS_DUMMYNET; 4298 if (r->dnflags & PFRULE_DN_IS_PIPE) 4299 dnflow.rule.info |= IPFW_IS_PIPE; 4300 4301 dnflow.f_id.extra = dnflow.rule.info; 4302 4303 dnflow.flags = dir == PF_IN ? IPFW_ARGS_IN : IPFW_ARGS_OUT; 4304 dnflow.flags |= IPFW_ARGS_ETHER; 4305 dnflow.ifp = kif->pfik_ifp; 4306 4307 switch (af) { 4308 case AF_INET: 4309 dnflow.f_id.addr_type = 4; 4310 dnflow.f_id.src_ip = src->v4.s_addr; 4311 dnflow.f_id.dst_ip = dst->v4.s_addr; 4312 break; 4313 case AF_INET6: 4314 dnflow.flags |= IPFW_ARGS_IP6; 4315 dnflow.f_id.addr_type = 6; 4316 dnflow.f_id.src_ip6 = src->v6; 4317 dnflow.f_id.dst_ip6 = dst->v6; 4318 break; 4319 } 4320 4321 PF_RULES_RUNLOCK(); 4322 4323 mtag->flags |= PF_MTAG_FLAG_DUMMYNET; 4324 ip_dn_io_ptr(m0, &dnflow); 4325 if (*m0 != NULL) 4326 mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 4327 } else { 4328 PF_RULES_RUNLOCK(); 4329 } 4330 4331 if (action == PF_PASS && bridge_to) { 4332 pf_bridge_to(bridge_to->pfik_ifp, *m0); 4333 *m0 = NULL; /* We've eaten the packet. */ 4334 } 4335 4336 return (action); 4337 } 4338 4339 static int 4340 pf_test_rule(struct pf_krule **rm, struct pf_kstate **sm, struct pfi_kkif *kif, 4341 struct mbuf *m, int off, struct pf_pdesc *pd, struct pf_krule **am, 4342 struct pf_kruleset **rsm, struct inpcb *inp) 4343 { 4344 struct pf_krule *nr = NULL; 4345 struct pf_addr * const saddr = pd->src; 4346 struct pf_addr * const daddr = pd->dst; 4347 sa_family_t af = pd->af; 4348 struct pf_krule *r, *a = NULL; 4349 struct pf_kruleset *ruleset = NULL; 4350 struct pf_krule_slist match_rules; 4351 struct pf_krule_item *ri; 4352 struct pf_ksrc_node *nsn = NULL; 4353 struct tcphdr *th = &pd->hdr.tcp; 4354 struct pf_state_key *sk = NULL, *nk = NULL; 4355 u_short reason; 4356 int rewrite = 0, hdrlen = 0; 4357 int tag = -1; 4358 int asd = 0; 4359 int match = 0; 4360 int state_icmp = 0; 4361 u_int16_t sport = 0, dport = 0; 4362 u_int16_t bproto_sum = 0, bip_sum = 0; 4363 u_int8_t icmptype = 0, icmpcode = 0; 4364 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 4365 4366 PF_RULES_RASSERT(); 4367 4368 if (inp != NULL) { 4369 INP_LOCK_ASSERT(inp); 4370 pd->lookup.uid = inp->inp_cred->cr_uid; 4371 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 4372 pd->lookup.done = 1; 4373 } 4374 4375 switch (pd->proto) { 4376 case IPPROTO_TCP: 4377 sport = th->th_sport; 4378 dport = th->th_dport; 4379 hdrlen = sizeof(*th); 4380 break; 4381 case IPPROTO_UDP: 4382 sport = pd->hdr.udp.uh_sport; 4383 dport = pd->hdr.udp.uh_dport; 4384 hdrlen = sizeof(pd->hdr.udp); 4385 break; 4386 case IPPROTO_SCTP: 4387 sport = pd->hdr.sctp.src_port; 4388 dport = pd->hdr.sctp.dest_port; 4389 hdrlen = sizeof(pd->hdr.sctp); 4390 break; 4391 #ifdef INET 4392 case IPPROTO_ICMP: 4393 if (pd->af != AF_INET) 4394 break; 4395 sport = dport = pd->hdr.icmp.icmp_id; 4396 hdrlen = sizeof(pd->hdr.icmp); 4397 icmptype = pd->hdr.icmp.icmp_type; 4398 icmpcode = pd->hdr.icmp.icmp_code; 4399 4400 if (icmptype == ICMP_UNREACH || 4401 icmptype == ICMP_SOURCEQUENCH || 4402 icmptype == ICMP_REDIRECT || 4403 icmptype == ICMP_TIMXCEED || 4404 icmptype == ICMP_PARAMPROB) 4405 state_icmp++; 4406 break; 4407 #endif /* INET */ 4408 #ifdef INET6 4409 case IPPROTO_ICMPV6: 4410 if (af != AF_INET6) 4411 break; 4412 sport = dport = pd->hdr.icmp6.icmp6_id; 4413 hdrlen = sizeof(pd->hdr.icmp6); 4414 icmptype = pd->hdr.icmp6.icmp6_type; 4415 icmpcode = pd->hdr.icmp6.icmp6_code; 4416 4417 if (icmptype == ICMP6_DST_UNREACH || 4418 icmptype == ICMP6_PACKET_TOO_BIG || 4419 icmptype == ICMP6_TIME_EXCEEDED || 4420 icmptype == ICMP6_PARAM_PROB) 4421 state_icmp++; 4422 break; 4423 #endif /* INET6 */ 4424 default: 4425 sport = dport = hdrlen = 0; 4426 break; 4427 } 4428 4429 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4430 4431 /* check packet for BINAT/NAT/RDR */ 4432 if ((nr = pf_get_translation(pd, m, off, kif, &nsn, &sk, 4433 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 4434 KASSERT(sk != NULL, ("%s: null sk", __func__)); 4435 KASSERT(nk != NULL, ("%s: null nk", __func__)); 4436 4437 if (nr->log) { 4438 PFLOG_PACKET(kif, m, af, PFRES_MATCH, nr, a, 4439 ruleset, pd, 1); 4440 } 4441 4442 if (pd->ip_sum) 4443 bip_sum = *pd->ip_sum; 4444 4445 switch (pd->proto) { 4446 case IPPROTO_TCP: 4447 bproto_sum = th->th_sum; 4448 pd->proto_sum = &th->th_sum; 4449 4450 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4451 nk->port[pd->sidx] != sport) { 4452 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum, 4453 &th->th_sum, &nk->addr[pd->sidx], 4454 nk->port[pd->sidx], 0, af); 4455 pd->sport = &th->th_sport; 4456 sport = th->th_sport; 4457 } 4458 4459 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4460 nk->port[pd->didx] != dport) { 4461 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum, 4462 &th->th_sum, &nk->addr[pd->didx], 4463 nk->port[pd->didx], 0, af); 4464 dport = th->th_dport; 4465 pd->dport = &th->th_dport; 4466 } 4467 rewrite++; 4468 break; 4469 case IPPROTO_UDP: 4470 bproto_sum = pd->hdr.udp.uh_sum; 4471 pd->proto_sum = &pd->hdr.udp.uh_sum; 4472 4473 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4474 nk->port[pd->sidx] != sport) { 4475 pf_change_ap(m, saddr, &pd->hdr.udp.uh_sport, 4476 pd->ip_sum, &pd->hdr.udp.uh_sum, 4477 &nk->addr[pd->sidx], 4478 nk->port[pd->sidx], 1, af); 4479 sport = pd->hdr.udp.uh_sport; 4480 pd->sport = &pd->hdr.udp.uh_sport; 4481 } 4482 4483 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4484 nk->port[pd->didx] != dport) { 4485 pf_change_ap(m, daddr, &pd->hdr.udp.uh_dport, 4486 pd->ip_sum, &pd->hdr.udp.uh_sum, 4487 &nk->addr[pd->didx], 4488 nk->port[pd->didx], 1, af); 4489 dport = pd->hdr.udp.uh_dport; 4490 pd->dport = &pd->hdr.udp.uh_dport; 4491 } 4492 rewrite++; 4493 break; 4494 case IPPROTO_SCTP: { 4495 uint16_t checksum = 0; 4496 4497 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4498 nk->port[pd->sidx] != sport) { 4499 pf_change_ap(m, saddr, &pd->hdr.sctp.src_port, 4500 pd->ip_sum, &checksum, 4501 &nk->addr[pd->sidx], 4502 nk->port[pd->sidx], 1, af); 4503 } 4504 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4505 nk->port[pd->didx] != dport) { 4506 pf_change_ap(m, daddr, &pd->hdr.sctp.dest_port, 4507 pd->ip_sum, &checksum, 4508 &nk->addr[pd->didx], 4509 nk->port[pd->didx], 1, af); 4510 } 4511 break; 4512 } 4513 #ifdef INET 4514 case IPPROTO_ICMP: 4515 nk->port[0] = nk->port[1]; 4516 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 4517 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4518 nk->addr[pd->sidx].v4.s_addr, 0); 4519 4520 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 4521 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 4522 nk->addr[pd->didx].v4.s_addr, 0); 4523 4524 if (nk->port[1] != pd->hdr.icmp.icmp_id) { 4525 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( 4526 pd->hdr.icmp.icmp_cksum, sport, 4527 nk->port[1], 0); 4528 pd->hdr.icmp.icmp_id = nk->port[1]; 4529 pd->sport = &pd->hdr.icmp.icmp_id; 4530 } 4531 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); 4532 break; 4533 #endif /* INET */ 4534 #ifdef INET6 4535 case IPPROTO_ICMPV6: 4536 nk->port[0] = nk->port[1]; 4537 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 4538 pf_change_a6(saddr, &pd->hdr.icmp6.icmp6_cksum, 4539 &nk->addr[pd->sidx], 0); 4540 4541 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 4542 pf_change_a6(daddr, &pd->hdr.icmp6.icmp6_cksum, 4543 &nk->addr[pd->didx], 0); 4544 rewrite++; 4545 break; 4546 #endif /* INET */ 4547 default: 4548 switch (af) { 4549 #ifdef INET 4550 case AF_INET: 4551 if (PF_ANEQ(saddr, 4552 &nk->addr[pd->sidx], AF_INET)) 4553 pf_change_a(&saddr->v4.s_addr, 4554 pd->ip_sum, 4555 nk->addr[pd->sidx].v4.s_addr, 0); 4556 4557 if (PF_ANEQ(daddr, 4558 &nk->addr[pd->didx], AF_INET)) 4559 pf_change_a(&daddr->v4.s_addr, 4560 pd->ip_sum, 4561 nk->addr[pd->didx].v4.s_addr, 0); 4562 break; 4563 #endif /* INET */ 4564 #ifdef INET6 4565 case AF_INET6: 4566 if (PF_ANEQ(saddr, 4567 &nk->addr[pd->sidx], AF_INET6)) 4568 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 4569 4570 if (PF_ANEQ(daddr, 4571 &nk->addr[pd->didx], AF_INET6)) 4572 PF_ACPY(daddr, &nk->addr[pd->didx], af); 4573 break; 4574 #endif /* INET */ 4575 } 4576 break; 4577 } 4578 if (nr->natpass) 4579 r = NULL; 4580 pd->nat_rule = nr; 4581 } 4582 4583 SLIST_INIT(&match_rules); 4584 while (r != NULL) { 4585 pf_counter_u64_add(&r->evaluations, 1); 4586 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 4587 r = r->skip[PF_SKIP_IFP].ptr; 4588 else if (r->direction && r->direction != pd->dir) 4589 r = r->skip[PF_SKIP_DIR].ptr; 4590 else if (r->af && r->af != af) 4591 r = r->skip[PF_SKIP_AF].ptr; 4592 else if (r->proto && r->proto != pd->proto) 4593 r = r->skip[PF_SKIP_PROTO].ptr; 4594 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 4595 r->src.neg, kif, M_GETFIB(m))) 4596 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4597 /* tcp/udp only. port_op always 0 in other cases */ 4598 else if (r->src.port_op && !pf_match_port(r->src.port_op, 4599 r->src.port[0], r->src.port[1], sport)) 4600 r = r->skip[PF_SKIP_SRC_PORT].ptr; 4601 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 4602 r->dst.neg, NULL, M_GETFIB(m))) 4603 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4604 /* tcp/udp only. port_op always 0 in other cases */ 4605 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 4606 r->dst.port[0], r->dst.port[1], dport)) 4607 r = r->skip[PF_SKIP_DST_PORT].ptr; 4608 /* icmp only. type always 0 in other cases */ 4609 else if (r->type && r->type != icmptype + 1) 4610 r = TAILQ_NEXT(r, entries); 4611 /* icmp only. type always 0 in other cases */ 4612 else if (r->code && r->code != icmpcode + 1) 4613 r = TAILQ_NEXT(r, entries); 4614 else if (r->tos && !(r->tos == pd->tos)) 4615 r = TAILQ_NEXT(r, entries); 4616 else if (r->rule_flag & PFRULE_FRAGMENT) 4617 r = TAILQ_NEXT(r, entries); 4618 else if (pd->proto == IPPROTO_TCP && 4619 (r->flagset & th->th_flags) != r->flags) 4620 r = TAILQ_NEXT(r, entries); 4621 /* tcp/udp only. uid.op always 0 in other cases */ 4622 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 4623 pf_socket_lookup(pd, m), 1)) && 4624 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 4625 pd->lookup.uid)) 4626 r = TAILQ_NEXT(r, entries); 4627 /* tcp/udp only. gid.op always 0 in other cases */ 4628 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 4629 pf_socket_lookup(pd, m), 1)) && 4630 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 4631 pd->lookup.gid)) 4632 r = TAILQ_NEXT(r, entries); 4633 else if (r->prio && 4634 !pf_match_ieee8021q_pcp(r->prio, m)) 4635 r = TAILQ_NEXT(r, entries); 4636 else if (r->prob && 4637 r->prob <= arc4random()) 4638 r = TAILQ_NEXT(r, entries); 4639 else if (r->match_tag && !pf_match_tag(m, r, &tag, 4640 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 4641 r = TAILQ_NEXT(r, entries); 4642 else if (r->os_fingerprint != PF_OSFP_ANY && 4643 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 4644 pf_osfp_fingerprint(pd, m, off, th), 4645 r->os_fingerprint))) 4646 r = TAILQ_NEXT(r, entries); 4647 else { 4648 if (r->tag) 4649 tag = r->tag; 4650 if (r->anchor == NULL) { 4651 if (r->action == PF_MATCH) { 4652 ri = malloc(sizeof(struct pf_krule_item), M_PF_RULE_ITEM, M_NOWAIT | M_ZERO); 4653 if (ri == NULL) { 4654 REASON_SET(&reason, PFRES_MEMORY); 4655 goto cleanup; 4656 } 4657 ri->r = r; 4658 SLIST_INSERT_HEAD(&match_rules, ri, entry); 4659 pf_counter_u64_critical_enter(); 4660 pf_counter_u64_add_protected(&r->packets[pd->dir == PF_OUT], 1); 4661 pf_counter_u64_add_protected(&r->bytes[pd->dir == PF_OUT], pd->tot_len); 4662 pf_counter_u64_critical_exit(); 4663 pf_rule_to_actions(r, &pd->act); 4664 if (r->log) 4665 PFLOG_PACKET(kif, m, af, 4666 PFRES_MATCH, r, 4667 a, ruleset, pd, 1); 4668 } else { 4669 match = 1; 4670 *rm = r; 4671 *am = a; 4672 *rsm = ruleset; 4673 } 4674 if ((*rm)->quick) 4675 break; 4676 r = TAILQ_NEXT(r, entries); 4677 } else 4678 pf_step_into_anchor(anchor_stack, &asd, 4679 &ruleset, PF_RULESET_FILTER, &r, &a, 4680 &match); 4681 } 4682 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 4683 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 4684 break; 4685 } 4686 r = *rm; 4687 a = *am; 4688 ruleset = *rsm; 4689 4690 REASON_SET(&reason, PFRES_MATCH); 4691 4692 /* apply actions for last matching pass/block rule */ 4693 pf_rule_to_actions(r, &pd->act); 4694 4695 if (r->log) { 4696 if (rewrite) 4697 m_copyback(m, off, hdrlen, pd->hdr.any); 4698 PFLOG_PACKET(kif, m, af, reason, r, a, ruleset, pd, 1); 4699 } 4700 4701 if ((r->action == PF_DROP) && 4702 ((r->rule_flag & PFRULE_RETURNRST) || 4703 (r->rule_flag & PFRULE_RETURNICMP) || 4704 (r->rule_flag & PFRULE_RETURN))) { 4705 pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum, 4706 bip_sum, hdrlen, &reason, r->rtableid); 4707 } 4708 4709 if (r->action == PF_DROP) 4710 goto cleanup; 4711 4712 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 4713 REASON_SET(&reason, PFRES_MEMORY); 4714 goto cleanup; 4715 } 4716 if (pd->act.rtableid >= 0) 4717 M_SETFIB(m, pd->act.rtableid); 4718 4719 if (!state_icmp && (r->keep_state || nr != NULL || 4720 (pd->flags & PFDESC_TCP_NORM))) { 4721 int action; 4722 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 4723 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 4724 hdrlen, &match_rules); 4725 if (action != PF_PASS) { 4726 if (action == PF_DROP && 4727 (r->rule_flag & PFRULE_RETURN)) 4728 pf_return(r, nr, pd, sk, off, m, th, kif, 4729 bproto_sum, bip_sum, hdrlen, &reason, 4730 pd->act.rtableid); 4731 return (action); 4732 } 4733 } else { 4734 uma_zfree(V_pf_state_key_z, sk); 4735 uma_zfree(V_pf_state_key_z, nk); 4736 } 4737 4738 /* copy back packet headers if we performed NAT operations */ 4739 if (rewrite) 4740 m_copyback(m, off, hdrlen, pd->hdr.any); 4741 4742 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 4743 pd->dir == PF_OUT && 4744 V_pfsync_defer_ptr != NULL && V_pfsync_defer_ptr(*sm, m)) 4745 /* 4746 * We want the state created, but we dont 4747 * want to send this in case a partner 4748 * firewall has to know about it to allow 4749 * replies through it. 4750 */ 4751 return (PF_DEFER); 4752 4753 return (PF_PASS); 4754 4755 cleanup: 4756 while ((ri = SLIST_FIRST(&match_rules))) { 4757 SLIST_REMOVE_HEAD(&match_rules, entry); 4758 free(ri, M_PF_RULE_ITEM); 4759 } 4760 4761 uma_zfree(V_pf_state_key_z, sk); 4762 uma_zfree(V_pf_state_key_z, nk); 4763 return (PF_DROP); 4764 } 4765 4766 static int 4767 pf_create_state(struct pf_krule *r, struct pf_krule *nr, struct pf_krule *a, 4768 struct pf_pdesc *pd, struct pf_ksrc_node *nsn, struct pf_state_key *nk, 4769 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 4770 u_int16_t dport, int *rewrite, struct pfi_kkif *kif, struct pf_kstate **sm, 4771 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen, 4772 struct pf_krule_slist *match_rules) 4773 { 4774 struct pf_kstate *s = NULL; 4775 struct pf_ksrc_node *sn = NULL; 4776 struct tcphdr *th = &pd->hdr.tcp; 4777 u_int16_t mss = V_tcp_mssdflt; 4778 u_short reason, sn_reason; 4779 4780 /* check maximums */ 4781 if (r->max_states && 4782 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 4783 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 4784 REASON_SET(&reason, PFRES_MAXSTATES); 4785 goto csfailed; 4786 } 4787 /* src node for filter rule */ 4788 if ((r->rule_flag & PFRULE_SRCTRACK || 4789 r->rpool.opts & PF_POOL_STICKYADDR) && 4790 (sn_reason = pf_insert_src_node(&sn, r, pd->src, pd->af)) != 0) { 4791 REASON_SET(&reason, sn_reason); 4792 goto csfailed; 4793 } 4794 /* src node for translation rule */ 4795 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4796 (sn_reason = pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], 4797 pd->af)) != 0 ) { 4798 REASON_SET(&reason, sn_reason); 4799 goto csfailed; 4800 } 4801 s = pf_alloc_state(M_NOWAIT); 4802 if (s == NULL) { 4803 REASON_SET(&reason, PFRES_MEMORY); 4804 goto csfailed; 4805 } 4806 s->rule.ptr = r; 4807 s->nat_rule.ptr = nr; 4808 s->anchor.ptr = a; 4809 bcopy(match_rules, &s->match_rules, sizeof(s->match_rules)); 4810 memcpy(&s->act, &pd->act, sizeof(struct pf_rule_actions)); 4811 4812 STATE_INC_COUNTERS(s); 4813 if (r->allow_opts) 4814 s->state_flags |= PFSTATE_ALLOWOPTS; 4815 if (r->rule_flag & PFRULE_STATESLOPPY) 4816 s->state_flags |= PFSTATE_SLOPPY; 4817 if (pd->flags & PFDESC_TCP_NORM) /* Set by old-style scrub rules */ 4818 s->state_flags |= PFSTATE_SCRUB_TCP; 4819 4820 s->act.log = pd->act.log & PF_LOG_ALL; 4821 s->sync_state = PFSYNC_S_NONE; 4822 s->state_flags |= pd->act.flags; /* Only needed for pfsync and state export */ 4823 4824 if (nr != NULL) 4825 s->act.log |= nr->log & PF_LOG_ALL; 4826 switch (pd->proto) { 4827 case IPPROTO_TCP: 4828 s->src.seqlo = ntohl(th->th_seq); 4829 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 4830 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 4831 r->keep_state == PF_STATE_MODULATE) { 4832 /* Generate sequence number modulator */ 4833 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 4834 0) 4835 s->src.seqdiff = 1; 4836 pf_change_proto_a(m, &th->th_seq, &th->th_sum, 4837 htonl(s->src.seqlo + s->src.seqdiff), 0); 4838 *rewrite = 1; 4839 } else 4840 s->src.seqdiff = 0; 4841 if (th->th_flags & TH_SYN) { 4842 s->src.seqhi++; 4843 s->src.wscale = pf_get_wscale(m, off, 4844 th->th_off, pd->af); 4845 } 4846 s->src.max_win = MAX(ntohs(th->th_win), 1); 4847 if (s->src.wscale & PF_WSCALE_MASK) { 4848 /* Remove scale factor from initial window */ 4849 int win = s->src.max_win; 4850 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 4851 s->src.max_win = (win - 1) >> 4852 (s->src.wscale & PF_WSCALE_MASK); 4853 } 4854 if (th->th_flags & TH_FIN) 4855 s->src.seqhi++; 4856 s->dst.seqhi = 1; 4857 s->dst.max_win = 1; 4858 pf_set_protostate(s, PF_PEER_SRC, TCPS_SYN_SENT); 4859 pf_set_protostate(s, PF_PEER_DST, TCPS_CLOSED); 4860 s->timeout = PFTM_TCP_FIRST_PACKET; 4861 atomic_add_32(&V_pf_status.states_halfopen, 1); 4862 break; 4863 case IPPROTO_UDP: 4864 pf_set_protostate(s, PF_PEER_SRC, PFUDPS_SINGLE); 4865 pf_set_protostate(s, PF_PEER_DST, PFUDPS_NO_TRAFFIC); 4866 s->timeout = PFTM_UDP_FIRST_PACKET; 4867 break; 4868 case IPPROTO_SCTP: 4869 pf_set_protostate(s, PF_PEER_SRC, SCTP_COOKIE_WAIT); 4870 pf_set_protostate(s, PF_PEER_DST, SCTP_CLOSED); 4871 s->timeout = PFTM_TCP_FIRST_PACKET; 4872 break; 4873 case IPPROTO_ICMP: 4874 #ifdef INET6 4875 case IPPROTO_ICMPV6: 4876 #endif 4877 s->timeout = PFTM_ICMP_FIRST_PACKET; 4878 break; 4879 default: 4880 pf_set_protostate(s, PF_PEER_SRC, PFOTHERS_SINGLE); 4881 pf_set_protostate(s, PF_PEER_DST, PFOTHERS_NO_TRAFFIC); 4882 s->timeout = PFTM_OTHER_FIRST_PACKET; 4883 } 4884 4885 if (r->rt) { 4886 /* pf_map_addr increases the reason counters */ 4887 if ((reason = pf_map_addr(pd->af, r, pd->src, &s->rt_addr, 4888 &s->rt_kif, NULL, &sn)) != 0) { 4889 pf_src_tree_remove_state(s); 4890 s->timeout = PFTM_UNLINKED; 4891 STATE_DEC_COUNTERS(s); 4892 pf_free_state(s); 4893 goto csfailed; 4894 } 4895 s->rt = r->rt; 4896 } 4897 4898 s->creation = time_uptime; 4899 s->expire = time_uptime; 4900 4901 if (sn != NULL) 4902 s->src_node = sn; 4903 if (nsn != NULL) { 4904 /* XXX We only modify one side for now. */ 4905 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 4906 s->nat_src_node = nsn; 4907 } 4908 if (pd->proto == IPPROTO_TCP) { 4909 if (s->state_flags & PFSTATE_SCRUB_TCP && 4910 pf_normalize_tcp_init(m, off, pd, th, &s->src, &s->dst)) { 4911 REASON_SET(&reason, PFRES_MEMORY); 4912 goto drop; 4913 } 4914 if (s->state_flags & PFSTATE_SCRUB_TCP && s->src.scrub && 4915 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 4916 &s->src, &s->dst, rewrite)) { 4917 /* This really shouldn't happen!!! */ 4918 DPFPRINTF(PF_DEBUG_URGENT, 4919 ("pf_normalize_tcp_stateful failed on first " 4920 "pkt\n")); 4921 goto drop; 4922 } 4923 } else if (pd->proto == IPPROTO_SCTP) { 4924 if (pf_normalize_sctp_init(m, off, pd, &s->src, &s->dst)) 4925 goto drop; 4926 if (! (pd->sctp_flags & (PFDESC_SCTP_INIT | PFDESC_SCTP_ADD_IP))) 4927 goto drop; 4928 } 4929 s->direction = pd->dir; 4930 4931 /* 4932 * sk/nk could already been setup by pf_get_translation(). 4933 */ 4934 if (nr == NULL) { 4935 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 4936 __func__, nr, sk, nk)); 4937 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 4938 if (sk == NULL) 4939 goto csfailed; 4940 nk = sk; 4941 } else 4942 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 4943 __func__, nr, sk, nk)); 4944 4945 /* Swap sk/nk for PF_OUT. */ 4946 if (pf_state_insert(BOUND_IFACE(r, kif), kif, 4947 (pd->dir == PF_IN) ? sk : nk, 4948 (pd->dir == PF_IN) ? nk : sk, s)) { 4949 REASON_SET(&reason, PFRES_STATEINS); 4950 pf_src_tree_remove_state(s); 4951 s->timeout = PFTM_UNLINKED; 4952 STATE_DEC_COUNTERS(s); 4953 pf_free_state(s); 4954 return (PF_DROP); 4955 } else 4956 *sm = s; 4957 4958 if (tag > 0) 4959 s->tag = tag; 4960 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 4961 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 4962 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_SRC); 4963 /* undo NAT changes, if they have taken place */ 4964 if (nr != NULL) { 4965 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 4966 if (pd->dir == PF_OUT) 4967 skt = s->key[PF_SK_STACK]; 4968 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 4969 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 4970 if (pd->sport) 4971 *pd->sport = skt->port[pd->sidx]; 4972 if (pd->dport) 4973 *pd->dport = skt->port[pd->didx]; 4974 if (pd->proto_sum) 4975 *pd->proto_sum = bproto_sum; 4976 if (pd->ip_sum) 4977 *pd->ip_sum = bip_sum; 4978 m_copyback(m, off, hdrlen, pd->hdr.any); 4979 } 4980 s->src.seqhi = htonl(arc4random()); 4981 /* Find mss option */ 4982 int rtid = M_GETFIB(m); 4983 mss = pf_get_mss(m, off, th->th_off, pd->af); 4984 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 4985 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 4986 s->src.mss = mss; 4987 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 4988 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 4989 TH_SYN|TH_ACK, 0, s->src.mss, 0, true, 0, 0, 4990 pd->act.rtableid); 4991 REASON_SET(&reason, PFRES_SYNPROXY); 4992 return (PF_SYNPROXY_DROP); 4993 } 4994 4995 return (PF_PASS); 4996 4997 csfailed: 4998 uma_zfree(V_pf_state_key_z, sk); 4999 uma_zfree(V_pf_state_key_z, nk); 5000 5001 if (sn != NULL) { 5002 PF_SRC_NODE_LOCK(sn); 5003 if (--sn->states == 0 && sn->expire == 0) { 5004 pf_unlink_src_node(sn); 5005 uma_zfree(V_pf_sources_z, sn); 5006 counter_u64_add( 5007 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 5008 } 5009 PF_SRC_NODE_UNLOCK(sn); 5010 } 5011 5012 if (nsn != sn && nsn != NULL) { 5013 PF_SRC_NODE_LOCK(nsn); 5014 if (--nsn->states == 0 && nsn->expire == 0) { 5015 pf_unlink_src_node(nsn); 5016 uma_zfree(V_pf_sources_z, nsn); 5017 counter_u64_add( 5018 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 5019 } 5020 PF_SRC_NODE_UNLOCK(nsn); 5021 } 5022 5023 return (PF_DROP); 5024 5025 drop: 5026 pf_src_tree_remove_state(s); 5027 s->timeout = PFTM_UNLINKED; 5028 STATE_DEC_COUNTERS(s); 5029 pf_free_state(s); 5030 return (PF_DROP); 5031 } 5032 5033 static int 5034 pf_test_fragment(struct pf_krule **rm, struct pfi_kkif *kif, 5035 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_krule **am, 5036 struct pf_kruleset **rsm) 5037 { 5038 struct pf_krule *r, *a = NULL; 5039 struct pf_kruleset *ruleset = NULL; 5040 struct pf_krule_slist match_rules; 5041 struct pf_krule_item *ri; 5042 sa_family_t af = pd->af; 5043 u_short reason; 5044 int tag = -1; 5045 int asd = 0; 5046 int match = 0; 5047 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 5048 5049 PF_RULES_RASSERT(); 5050 5051 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 5052 SLIST_INIT(&match_rules); 5053 while (r != NULL) { 5054 pf_counter_u64_add(&r->evaluations, 1); 5055 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 5056 r = r->skip[PF_SKIP_IFP].ptr; 5057 else if (r->direction && r->direction != pd->dir) 5058 r = r->skip[PF_SKIP_DIR].ptr; 5059 else if (r->af && r->af != af) 5060 r = r->skip[PF_SKIP_AF].ptr; 5061 else if (r->proto && r->proto != pd->proto) 5062 r = r->skip[PF_SKIP_PROTO].ptr; 5063 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 5064 r->src.neg, kif, M_GETFIB(m))) 5065 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 5066 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 5067 r->dst.neg, NULL, M_GETFIB(m))) 5068 r = r->skip[PF_SKIP_DST_ADDR].ptr; 5069 else if (r->tos && !(r->tos == pd->tos)) 5070 r = TAILQ_NEXT(r, entries); 5071 else if (r->os_fingerprint != PF_OSFP_ANY) 5072 r = TAILQ_NEXT(r, entries); 5073 else if (pd->proto == IPPROTO_UDP && 5074 (r->src.port_op || r->dst.port_op)) 5075 r = TAILQ_NEXT(r, entries); 5076 else if (pd->proto == IPPROTO_TCP && 5077 (r->src.port_op || r->dst.port_op || r->flagset)) 5078 r = TAILQ_NEXT(r, entries); 5079 else if ((pd->proto == IPPROTO_ICMP || 5080 pd->proto == IPPROTO_ICMPV6) && 5081 (r->type || r->code)) 5082 r = TAILQ_NEXT(r, entries); 5083 else if (r->prio && 5084 !pf_match_ieee8021q_pcp(r->prio, m)) 5085 r = TAILQ_NEXT(r, entries); 5086 else if (r->prob && r->prob <= 5087 (arc4random() % (UINT_MAX - 1) + 1)) 5088 r = TAILQ_NEXT(r, entries); 5089 else if (r->match_tag && !pf_match_tag(m, r, &tag, 5090 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 5091 r = TAILQ_NEXT(r, entries); 5092 else { 5093 if (r->anchor == NULL) { 5094 if (r->action == PF_MATCH) { 5095 ri = malloc(sizeof(struct pf_krule_item), M_PF_RULE_ITEM, M_NOWAIT | M_ZERO); 5096 if (ri == NULL) { 5097 REASON_SET(&reason, PFRES_MEMORY); 5098 goto cleanup; 5099 } 5100 ri->r = r; 5101 SLIST_INSERT_HEAD(&match_rules, ri, entry); 5102 pf_counter_u64_critical_enter(); 5103 pf_counter_u64_add_protected(&r->packets[pd->dir == PF_OUT], 1); 5104 pf_counter_u64_add_protected(&r->bytes[pd->dir == PF_OUT], pd->tot_len); 5105 pf_counter_u64_critical_exit(); 5106 pf_rule_to_actions(r, &pd->act); 5107 if (r->log) 5108 PFLOG_PACKET(kif, m, af, 5109 PFRES_MATCH, r, 5110 a, ruleset, pd, 1); 5111 } else { 5112 match = 1; 5113 *rm = r; 5114 *am = a; 5115 *rsm = ruleset; 5116 } 5117 if ((*rm)->quick) 5118 break; 5119 r = TAILQ_NEXT(r, entries); 5120 } else 5121 pf_step_into_anchor(anchor_stack, &asd, 5122 &ruleset, PF_RULESET_FILTER, &r, &a, 5123 &match); 5124 } 5125 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 5126 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 5127 break; 5128 } 5129 r = *rm; 5130 a = *am; 5131 ruleset = *rsm; 5132 5133 REASON_SET(&reason, PFRES_MATCH); 5134 5135 /* apply actions for last matching pass/block rule */ 5136 pf_rule_to_actions(r, &pd->act); 5137 5138 if (r->log) 5139 PFLOG_PACKET(kif, m, af, reason, r, a, ruleset, pd, 1); 5140 5141 if (r->action != PF_PASS) 5142 return (PF_DROP); 5143 5144 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 5145 REASON_SET(&reason, PFRES_MEMORY); 5146 goto cleanup; 5147 } 5148 5149 return (PF_PASS); 5150 5151 cleanup: 5152 while ((ri = SLIST_FIRST(&match_rules))) { 5153 SLIST_REMOVE_HEAD(&match_rules, entry); 5154 free(ri, M_PF_RULE_ITEM); 5155 } 5156 5157 return (PF_DROP); 5158 } 5159 5160 static int 5161 pf_tcp_track_full(struct pf_kstate **state, struct pfi_kkif *kif, 5162 struct mbuf *m, int off, struct pf_pdesc *pd, u_short *reason, 5163 int *copyback) 5164 { 5165 struct tcphdr *th = &pd->hdr.tcp; 5166 struct pf_state_peer *src, *dst; 5167 u_int16_t win = ntohs(th->th_win); 5168 u_int32_t ack, end, seq, orig_seq; 5169 u_int8_t sws, dws, psrc, pdst; 5170 int ackskew; 5171 5172 if (pd->dir == (*state)->direction) { 5173 src = &(*state)->src; 5174 dst = &(*state)->dst; 5175 psrc = PF_PEER_SRC; 5176 pdst = PF_PEER_DST; 5177 } else { 5178 src = &(*state)->dst; 5179 dst = &(*state)->src; 5180 psrc = PF_PEER_DST; 5181 pdst = PF_PEER_SRC; 5182 } 5183 5184 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 5185 sws = src->wscale & PF_WSCALE_MASK; 5186 dws = dst->wscale & PF_WSCALE_MASK; 5187 } else 5188 sws = dws = 0; 5189 5190 /* 5191 * Sequence tracking algorithm from Guido van Rooij's paper: 5192 * http://www.madison-gurkha.com/publications/tcp_filtering/ 5193 * tcp_filtering.ps 5194 */ 5195 5196 orig_seq = seq = ntohl(th->th_seq); 5197 if (src->seqlo == 0) { 5198 /* First packet from this end. Set its state */ 5199 5200 if (((*state)->state_flags & PFSTATE_SCRUB_TCP || dst->scrub) && 5201 src->scrub == NULL) { 5202 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 5203 REASON_SET(reason, PFRES_MEMORY); 5204 return (PF_DROP); 5205 } 5206 } 5207 5208 /* Deferred generation of sequence number modulator */ 5209 if (dst->seqdiff && !src->seqdiff) { 5210 /* use random iss for the TCP server */ 5211 while ((src->seqdiff = arc4random() - seq) == 0) 5212 ; 5213 ack = ntohl(th->th_ack) - dst->seqdiff; 5214 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 5215 src->seqdiff), 0); 5216 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 5217 *copyback = 1; 5218 } else { 5219 ack = ntohl(th->th_ack); 5220 } 5221 5222 end = seq + pd->p_len; 5223 if (th->th_flags & TH_SYN) { 5224 end++; 5225 if (dst->wscale & PF_WSCALE_FLAG) { 5226 src->wscale = pf_get_wscale(m, off, th->th_off, 5227 pd->af); 5228 if (src->wscale & PF_WSCALE_FLAG) { 5229 /* Remove scale factor from initial 5230 * window */ 5231 sws = src->wscale & PF_WSCALE_MASK; 5232 win = ((u_int32_t)win + (1 << sws) - 1) 5233 >> sws; 5234 dws = dst->wscale & PF_WSCALE_MASK; 5235 } else { 5236 /* fixup other window */ 5237 dst->max_win <<= dst->wscale & 5238 PF_WSCALE_MASK; 5239 /* in case of a retrans SYN|ACK */ 5240 dst->wscale = 0; 5241 } 5242 } 5243 } 5244 if (th->th_flags & TH_FIN) 5245 end++; 5246 5247 src->seqlo = seq; 5248 if (src->state < TCPS_SYN_SENT) 5249 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5250 5251 /* 5252 * May need to slide the window (seqhi may have been set by 5253 * the crappy stack check or if we picked up the connection 5254 * after establishment) 5255 */ 5256 if (src->seqhi == 1 || 5257 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 5258 src->seqhi = end + MAX(1, dst->max_win << dws); 5259 if (win > src->max_win) 5260 src->max_win = win; 5261 5262 } else { 5263 ack = ntohl(th->th_ack) - dst->seqdiff; 5264 if (src->seqdiff) { 5265 /* Modulate sequence numbers */ 5266 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 5267 src->seqdiff), 0); 5268 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 5269 *copyback = 1; 5270 } 5271 end = seq + pd->p_len; 5272 if (th->th_flags & TH_SYN) 5273 end++; 5274 if (th->th_flags & TH_FIN) 5275 end++; 5276 } 5277 5278 if ((th->th_flags & TH_ACK) == 0) { 5279 /* Let it pass through the ack skew check */ 5280 ack = dst->seqlo; 5281 } else if ((ack == 0 && 5282 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 5283 /* broken tcp stacks do not set ack */ 5284 (dst->state < TCPS_SYN_SENT)) { 5285 /* 5286 * Many stacks (ours included) will set the ACK number in an 5287 * FIN|ACK if the SYN times out -- no sequence to ACK. 5288 */ 5289 ack = dst->seqlo; 5290 } 5291 5292 if (seq == end) { 5293 /* Ease sequencing restrictions on no data packets */ 5294 seq = src->seqlo; 5295 end = seq; 5296 } 5297 5298 ackskew = dst->seqlo - ack; 5299 5300 /* 5301 * Need to demodulate the sequence numbers in any TCP SACK options 5302 * (Selective ACK). We could optionally validate the SACK values 5303 * against the current ACK window, either forwards or backwards, but 5304 * I'm not confident that SACK has been implemented properly 5305 * everywhere. It wouldn't surprise me if several stacks accidentally 5306 * SACK too far backwards of previously ACKed data. There really aren't 5307 * any security implications of bad SACKing unless the target stack 5308 * doesn't validate the option length correctly. Someone trying to 5309 * spoof into a TCP connection won't bother blindly sending SACK 5310 * options anyway. 5311 */ 5312 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 5313 if (pf_modulate_sack(m, off, pd, th, dst)) 5314 *copyback = 1; 5315 } 5316 5317 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 5318 if (SEQ_GEQ(src->seqhi, end) && 5319 /* Last octet inside other's window space */ 5320 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 5321 /* Retrans: not more than one window back */ 5322 (ackskew >= -MAXACKWINDOW) && 5323 /* Acking not more than one reassembled fragment backwards */ 5324 (ackskew <= (MAXACKWINDOW << sws)) && 5325 /* Acking not more than one window forward */ 5326 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 5327 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 5328 (pd->flags & PFDESC_IP_REAS) == 0)) { 5329 /* Require an exact/+1 sequence match on resets when possible */ 5330 5331 if (dst->scrub || src->scrub) { 5332 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5333 *state, src, dst, copyback)) 5334 return (PF_DROP); 5335 } 5336 5337 /* update max window */ 5338 if (src->max_win < win) 5339 src->max_win = win; 5340 /* synchronize sequencing */ 5341 if (SEQ_GT(end, src->seqlo)) 5342 src->seqlo = end; 5343 /* slide the window of what the other end can send */ 5344 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5345 dst->seqhi = ack + MAX((win << sws), 1); 5346 5347 /* update states */ 5348 if (th->th_flags & TH_SYN) 5349 if (src->state < TCPS_SYN_SENT) 5350 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5351 if (th->th_flags & TH_FIN) 5352 if (src->state < TCPS_CLOSING) 5353 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5354 if (th->th_flags & TH_ACK) { 5355 if (dst->state == TCPS_SYN_SENT) { 5356 pf_set_protostate(*state, pdst, 5357 TCPS_ESTABLISHED); 5358 if (src->state == TCPS_ESTABLISHED && 5359 (*state)->src_node != NULL && 5360 pf_src_connlimit(state)) { 5361 REASON_SET(reason, PFRES_SRCLIMIT); 5362 return (PF_DROP); 5363 } 5364 } else if (dst->state == TCPS_CLOSING) 5365 pf_set_protostate(*state, pdst, 5366 TCPS_FIN_WAIT_2); 5367 } 5368 if (th->th_flags & TH_RST) 5369 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5370 5371 /* update expire time */ 5372 (*state)->expire = time_uptime; 5373 if (src->state >= TCPS_FIN_WAIT_2 && 5374 dst->state >= TCPS_FIN_WAIT_2) 5375 (*state)->timeout = PFTM_TCP_CLOSED; 5376 else if (src->state >= TCPS_CLOSING && 5377 dst->state >= TCPS_CLOSING) 5378 (*state)->timeout = PFTM_TCP_FIN_WAIT; 5379 else if (src->state < TCPS_ESTABLISHED || 5380 dst->state < TCPS_ESTABLISHED) 5381 (*state)->timeout = PFTM_TCP_OPENING; 5382 else if (src->state >= TCPS_CLOSING || 5383 dst->state >= TCPS_CLOSING) 5384 (*state)->timeout = PFTM_TCP_CLOSING; 5385 else 5386 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5387 5388 /* Fall through to PASS packet */ 5389 5390 } else if ((dst->state < TCPS_SYN_SENT || 5391 dst->state >= TCPS_FIN_WAIT_2 || 5392 src->state >= TCPS_FIN_WAIT_2) && 5393 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 5394 /* Within a window forward of the originating packet */ 5395 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 5396 /* Within a window backward of the originating packet */ 5397 5398 /* 5399 * This currently handles three situations: 5400 * 1) Stupid stacks will shotgun SYNs before their peer 5401 * replies. 5402 * 2) When PF catches an already established stream (the 5403 * firewall rebooted, the state table was flushed, routes 5404 * changed...) 5405 * 3) Packets get funky immediately after the connection 5406 * closes (this should catch Solaris spurious ACK|FINs 5407 * that web servers like to spew after a close) 5408 * 5409 * This must be a little more careful than the above code 5410 * since packet floods will also be caught here. We don't 5411 * update the TTL here to mitigate the damage of a packet 5412 * flood and so the same code can handle awkward establishment 5413 * and a loosened connection close. 5414 * In the establishment case, a correct peer response will 5415 * validate the connection, go through the normal state code 5416 * and keep updating the state TTL. 5417 */ 5418 5419 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5420 printf("pf: loose state match: "); 5421 pf_print_state(*state); 5422 pf_print_flags(th->th_flags); 5423 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5424 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 5425 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 5426 (unsigned long long)(*state)->packets[1], 5427 pd->dir == PF_IN ? "in" : "out", 5428 pd->dir == (*state)->direction ? "fwd" : "rev"); 5429 } 5430 5431 if (dst->scrub || src->scrub) { 5432 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5433 *state, src, dst, copyback)) 5434 return (PF_DROP); 5435 } 5436 5437 /* update max window */ 5438 if (src->max_win < win) 5439 src->max_win = win; 5440 /* synchronize sequencing */ 5441 if (SEQ_GT(end, src->seqlo)) 5442 src->seqlo = end; 5443 /* slide the window of what the other end can send */ 5444 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5445 dst->seqhi = ack + MAX((win << sws), 1); 5446 5447 /* 5448 * Cannot set dst->seqhi here since this could be a shotgunned 5449 * SYN and not an already established connection. 5450 */ 5451 5452 if (th->th_flags & TH_FIN) 5453 if (src->state < TCPS_CLOSING) 5454 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5455 if (th->th_flags & TH_RST) 5456 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5457 5458 /* Fall through to PASS packet */ 5459 5460 } else { 5461 if ((*state)->dst.state == TCPS_SYN_SENT && 5462 (*state)->src.state == TCPS_SYN_SENT) { 5463 /* Send RST for state mismatches during handshake */ 5464 if (!(th->th_flags & TH_RST)) 5465 pf_send_tcp((*state)->rule.ptr, pd->af, 5466 pd->dst, pd->src, th->th_dport, 5467 th->th_sport, ntohl(th->th_ack), 0, 5468 TH_RST, 0, 0, 5469 (*state)->rule.ptr->return_ttl, true, 0, 0, 5470 (*state)->act.rtableid); 5471 src->seqlo = 0; 5472 src->seqhi = 1; 5473 src->max_win = 1; 5474 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 5475 printf("pf: BAD state: "); 5476 pf_print_state(*state); 5477 pf_print_flags(th->th_flags); 5478 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5479 "pkts=%llu:%llu dir=%s,%s\n", 5480 seq, orig_seq, ack, pd->p_len, ackskew, 5481 (unsigned long long)(*state)->packets[0], 5482 (unsigned long long)(*state)->packets[1], 5483 pd->dir == PF_IN ? "in" : "out", 5484 pd->dir == (*state)->direction ? "fwd" : "rev"); 5485 printf("pf: State failure on: %c %c %c %c | %c %c\n", 5486 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 5487 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 5488 ' ': '2', 5489 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 5490 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 5491 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 5492 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 5493 } 5494 REASON_SET(reason, PFRES_BADSTATE); 5495 return (PF_DROP); 5496 } 5497 5498 return (PF_PASS); 5499 } 5500 5501 static int 5502 pf_tcp_track_sloppy(struct pf_kstate **state, struct pf_pdesc *pd, u_short *reason) 5503 { 5504 struct tcphdr *th = &pd->hdr.tcp; 5505 struct pf_state_peer *src, *dst; 5506 u_int8_t psrc, pdst; 5507 5508 if (pd->dir == (*state)->direction) { 5509 src = &(*state)->src; 5510 dst = &(*state)->dst; 5511 psrc = PF_PEER_SRC; 5512 pdst = PF_PEER_DST; 5513 } else { 5514 src = &(*state)->dst; 5515 dst = &(*state)->src; 5516 psrc = PF_PEER_DST; 5517 pdst = PF_PEER_SRC; 5518 } 5519 5520 if (th->th_flags & TH_SYN) 5521 if (src->state < TCPS_SYN_SENT) 5522 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5523 if (th->th_flags & TH_FIN) 5524 if (src->state < TCPS_CLOSING) 5525 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5526 if (th->th_flags & TH_ACK) { 5527 if (dst->state == TCPS_SYN_SENT) { 5528 pf_set_protostate(*state, pdst, TCPS_ESTABLISHED); 5529 if (src->state == TCPS_ESTABLISHED && 5530 (*state)->src_node != NULL && 5531 pf_src_connlimit(state)) { 5532 REASON_SET(reason, PFRES_SRCLIMIT); 5533 return (PF_DROP); 5534 } 5535 } else if (dst->state == TCPS_CLOSING) { 5536 pf_set_protostate(*state, pdst, TCPS_FIN_WAIT_2); 5537 } else if (src->state == TCPS_SYN_SENT && 5538 dst->state < TCPS_SYN_SENT) { 5539 /* 5540 * Handle a special sloppy case where we only see one 5541 * half of the connection. If there is a ACK after 5542 * the initial SYN without ever seeing a packet from 5543 * the destination, set the connection to established. 5544 */ 5545 pf_set_protostate(*state, PF_PEER_BOTH, 5546 TCPS_ESTABLISHED); 5547 dst->state = src->state = TCPS_ESTABLISHED; 5548 if ((*state)->src_node != NULL && 5549 pf_src_connlimit(state)) { 5550 REASON_SET(reason, PFRES_SRCLIMIT); 5551 return (PF_DROP); 5552 } 5553 } else if (src->state == TCPS_CLOSING && 5554 dst->state == TCPS_ESTABLISHED && 5555 dst->seqlo == 0) { 5556 /* 5557 * Handle the closing of half connections where we 5558 * don't see the full bidirectional FIN/ACK+ACK 5559 * handshake. 5560 */ 5561 pf_set_protostate(*state, pdst, TCPS_CLOSING); 5562 } 5563 } 5564 if (th->th_flags & TH_RST) 5565 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5566 5567 /* update expire time */ 5568 (*state)->expire = time_uptime; 5569 if (src->state >= TCPS_FIN_WAIT_2 && 5570 dst->state >= TCPS_FIN_WAIT_2) 5571 (*state)->timeout = PFTM_TCP_CLOSED; 5572 else if (src->state >= TCPS_CLOSING && 5573 dst->state >= TCPS_CLOSING) 5574 (*state)->timeout = PFTM_TCP_FIN_WAIT; 5575 else if (src->state < TCPS_ESTABLISHED || 5576 dst->state < TCPS_ESTABLISHED) 5577 (*state)->timeout = PFTM_TCP_OPENING; 5578 else if (src->state >= TCPS_CLOSING || 5579 dst->state >= TCPS_CLOSING) 5580 (*state)->timeout = PFTM_TCP_CLOSING; 5581 else 5582 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5583 5584 return (PF_PASS); 5585 } 5586 5587 static int 5588 pf_synproxy(struct pf_pdesc *pd, struct pf_kstate **state, u_short *reason) 5589 { 5590 struct pf_state_key *sk = (*state)->key[pd->didx]; 5591 struct tcphdr *th = &pd->hdr.tcp; 5592 5593 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 5594 if (pd->dir != (*state)->direction) { 5595 REASON_SET(reason, PFRES_SYNPROXY); 5596 return (PF_SYNPROXY_DROP); 5597 } 5598 if (th->th_flags & TH_SYN) { 5599 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 5600 REASON_SET(reason, PFRES_SYNPROXY); 5601 return (PF_DROP); 5602 } 5603 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5604 pd->src, th->th_dport, th->th_sport, 5605 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 5606 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, true, 0, 0, 5607 (*state)->act.rtableid); 5608 REASON_SET(reason, PFRES_SYNPROXY); 5609 return (PF_SYNPROXY_DROP); 5610 } else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK || 5611 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5612 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5613 REASON_SET(reason, PFRES_SYNPROXY); 5614 return (PF_DROP); 5615 } else if ((*state)->src_node != NULL && 5616 pf_src_connlimit(state)) { 5617 REASON_SET(reason, PFRES_SRCLIMIT); 5618 return (PF_DROP); 5619 } else 5620 pf_set_protostate(*state, PF_PEER_SRC, 5621 PF_TCPS_PROXY_DST); 5622 } 5623 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 5624 if (pd->dir == (*state)->direction) { 5625 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 5626 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5627 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5628 REASON_SET(reason, PFRES_SYNPROXY); 5629 return (PF_DROP); 5630 } 5631 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 5632 if ((*state)->dst.seqhi == 1) 5633 (*state)->dst.seqhi = htonl(arc4random()); 5634 pf_send_tcp((*state)->rule.ptr, pd->af, 5635 &sk->addr[pd->sidx], &sk->addr[pd->didx], 5636 sk->port[pd->sidx], sk->port[pd->didx], 5637 (*state)->dst.seqhi, 0, TH_SYN, 0, 5638 (*state)->src.mss, 0, false, (*state)->tag, 0, 5639 (*state)->act.rtableid); 5640 REASON_SET(reason, PFRES_SYNPROXY); 5641 return (PF_SYNPROXY_DROP); 5642 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 5643 (TH_SYN|TH_ACK)) || 5644 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 5645 REASON_SET(reason, PFRES_SYNPROXY); 5646 return (PF_DROP); 5647 } else { 5648 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 5649 (*state)->dst.seqlo = ntohl(th->th_seq); 5650 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5651 pd->src, th->th_dport, th->th_sport, 5652 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 5653 TH_ACK, (*state)->src.max_win, 0, 0, false, 5654 (*state)->tag, 0, (*state)->act.rtableid); 5655 pf_send_tcp((*state)->rule.ptr, pd->af, 5656 &sk->addr[pd->sidx], &sk->addr[pd->didx], 5657 sk->port[pd->sidx], sk->port[pd->didx], 5658 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 5659 TH_ACK, (*state)->dst.max_win, 0, 0, true, 0, 0, 5660 (*state)->act.rtableid); 5661 (*state)->src.seqdiff = (*state)->dst.seqhi - 5662 (*state)->src.seqlo; 5663 (*state)->dst.seqdiff = (*state)->src.seqhi - 5664 (*state)->dst.seqlo; 5665 (*state)->src.seqhi = (*state)->src.seqlo + 5666 (*state)->dst.max_win; 5667 (*state)->dst.seqhi = (*state)->dst.seqlo + 5668 (*state)->src.max_win; 5669 (*state)->src.wscale = (*state)->dst.wscale = 0; 5670 pf_set_protostate(*state, PF_PEER_BOTH, 5671 TCPS_ESTABLISHED); 5672 REASON_SET(reason, PFRES_SYNPROXY); 5673 return (PF_SYNPROXY_DROP); 5674 } 5675 } 5676 5677 return (PF_PASS); 5678 } 5679 5680 static int 5681 pf_test_state_tcp(struct pf_kstate **state, struct pfi_kkif *kif, 5682 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 5683 u_short *reason) 5684 { 5685 struct pf_state_key_cmp key; 5686 struct tcphdr *th = &pd->hdr.tcp; 5687 int copyback = 0; 5688 int action; 5689 struct pf_state_peer *src, *dst; 5690 5691 bzero(&key, sizeof(key)); 5692 key.af = pd->af; 5693 key.proto = IPPROTO_TCP; 5694 if (pd->dir == PF_IN) { /* wire side, straight */ 5695 PF_ACPY(&key.addr[0], pd->src, key.af); 5696 PF_ACPY(&key.addr[1], pd->dst, key.af); 5697 key.port[0] = th->th_sport; 5698 key.port[1] = th->th_dport; 5699 } else { /* stack side, reverse */ 5700 PF_ACPY(&key.addr[1], pd->src, key.af); 5701 PF_ACPY(&key.addr[0], pd->dst, key.af); 5702 key.port[1] = th->th_sport; 5703 key.port[0] = th->th_dport; 5704 } 5705 5706 STATE_LOOKUP(kif, &key, *state, pd); 5707 5708 if (pd->dir == (*state)->direction) { 5709 src = &(*state)->src; 5710 dst = &(*state)->dst; 5711 } else { 5712 src = &(*state)->dst; 5713 dst = &(*state)->src; 5714 } 5715 5716 if ((action = pf_synproxy(pd, state, reason)) != PF_PASS) 5717 return (action); 5718 5719 if (dst->state >= TCPS_FIN_WAIT_2 && 5720 src->state >= TCPS_FIN_WAIT_2 && 5721 (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) || 5722 ((th->th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_ACK && 5723 pf_syncookie_check(pd) && pd->dir == PF_IN))) { 5724 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5725 printf("pf: state reuse "); 5726 pf_print_state(*state); 5727 pf_print_flags(th->th_flags); 5728 printf("\n"); 5729 } 5730 /* XXX make sure it's the same direction ?? */ 5731 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED); 5732 pf_unlink_state(*state); 5733 *state = NULL; 5734 return (PF_DROP); 5735 } 5736 5737 if ((*state)->state_flags & PFSTATE_SLOPPY) { 5738 if (pf_tcp_track_sloppy(state, pd, reason) == PF_DROP) 5739 return (PF_DROP); 5740 } else { 5741 if (pf_tcp_track_full(state, kif, m, off, pd, reason, 5742 ©back) == PF_DROP) 5743 return (PF_DROP); 5744 } 5745 5746 /* translate source/destination address, if necessary */ 5747 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5748 struct pf_state_key *nk = (*state)->key[pd->didx]; 5749 5750 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5751 nk->port[pd->sidx] != th->th_sport) 5752 pf_change_ap(m, pd->src, &th->th_sport, 5753 pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], 5754 nk->port[pd->sidx], 0, pd->af); 5755 5756 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5757 nk->port[pd->didx] != th->th_dport) 5758 pf_change_ap(m, pd->dst, &th->th_dport, 5759 pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], 5760 nk->port[pd->didx], 0, pd->af); 5761 copyback = 1; 5762 } 5763 5764 /* Copyback sequence modulation or stateful scrub changes if needed */ 5765 if (copyback) 5766 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5767 5768 return (PF_PASS); 5769 } 5770 5771 static int 5772 pf_test_state_udp(struct pf_kstate **state, struct pfi_kkif *kif, 5773 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5774 { 5775 struct pf_state_peer *src, *dst; 5776 struct pf_state_key_cmp key; 5777 struct udphdr *uh = &pd->hdr.udp; 5778 uint8_t psrc, pdst; 5779 5780 bzero(&key, sizeof(key)); 5781 key.af = pd->af; 5782 key.proto = IPPROTO_UDP; 5783 if (pd->dir == PF_IN) { /* wire side, straight */ 5784 PF_ACPY(&key.addr[0], pd->src, key.af); 5785 PF_ACPY(&key.addr[1], pd->dst, key.af); 5786 key.port[0] = uh->uh_sport; 5787 key.port[1] = uh->uh_dport; 5788 } else { /* stack side, reverse */ 5789 PF_ACPY(&key.addr[1], pd->src, key.af); 5790 PF_ACPY(&key.addr[0], pd->dst, key.af); 5791 key.port[1] = uh->uh_sport; 5792 key.port[0] = uh->uh_dport; 5793 } 5794 5795 STATE_LOOKUP(kif, &key, *state, pd); 5796 5797 if (pd->dir == (*state)->direction) { 5798 src = &(*state)->src; 5799 dst = &(*state)->dst; 5800 psrc = PF_PEER_SRC; 5801 pdst = PF_PEER_DST; 5802 } else { 5803 src = &(*state)->dst; 5804 dst = &(*state)->src; 5805 psrc = PF_PEER_DST; 5806 pdst = PF_PEER_SRC; 5807 } 5808 5809 /* update states */ 5810 if (src->state < PFUDPS_SINGLE) 5811 pf_set_protostate(*state, psrc, PFUDPS_SINGLE); 5812 if (dst->state == PFUDPS_SINGLE) 5813 pf_set_protostate(*state, pdst, PFUDPS_MULTIPLE); 5814 5815 /* update expire time */ 5816 (*state)->expire = time_uptime; 5817 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5818 (*state)->timeout = PFTM_UDP_MULTIPLE; 5819 else 5820 (*state)->timeout = PFTM_UDP_SINGLE; 5821 5822 /* translate source/destination address, if necessary */ 5823 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5824 struct pf_state_key *nk = (*state)->key[pd->didx]; 5825 5826 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5827 nk->port[pd->sidx] != uh->uh_sport) 5828 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 5829 &uh->uh_sum, &nk->addr[pd->sidx], 5830 nk->port[pd->sidx], 1, pd->af); 5831 5832 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5833 nk->port[pd->didx] != uh->uh_dport) 5834 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 5835 &uh->uh_sum, &nk->addr[pd->didx], 5836 nk->port[pd->didx], 1, pd->af); 5837 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5838 } 5839 5840 return (PF_PASS); 5841 } 5842 5843 static int 5844 pf_test_state_sctp(struct pf_kstate **state, struct pfi_kkif *kif, 5845 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5846 { 5847 struct pf_state_key_cmp key; 5848 struct pf_state_peer *src; //, *dst; 5849 struct sctphdr *sh = &pd->hdr.sctp; 5850 u_int8_t psrc; //, pdst; 5851 5852 bzero(&key, sizeof(key)); 5853 key.af = pd->af; 5854 key.proto = IPPROTO_SCTP; 5855 if (pd->dir == PF_IN) { /* wire side, straight */ 5856 PF_ACPY(&key.addr[0], pd->src, key.af); 5857 PF_ACPY(&key.addr[1], pd->dst, key.af); 5858 key.port[0] = sh->src_port; 5859 key.port[1] = sh->dest_port; 5860 } else { /* stack side, reverse */ 5861 PF_ACPY(&key.addr[1], pd->src, key.af); 5862 PF_ACPY(&key.addr[0], pd->dst, key.af); 5863 key.port[1] = sh->src_port; 5864 key.port[0] = sh->dest_port; 5865 } 5866 5867 STATE_LOOKUP(kif, &key, *state, pd); 5868 5869 if (pd->dir == (*state)->direction) { 5870 src = &(*state)->src; 5871 psrc = PF_PEER_SRC; 5872 } else { 5873 src = &(*state)->dst; 5874 psrc = PF_PEER_DST; 5875 } 5876 5877 /* Track state. */ 5878 if (pd->sctp_flags & PFDESC_SCTP_INIT) { 5879 if (src->state < SCTP_COOKIE_WAIT) { 5880 pf_set_protostate(*state, psrc, SCTP_COOKIE_WAIT); 5881 (*state)->timeout = PFTM_TCP_OPENING; 5882 } 5883 } 5884 if (pd->sctp_flags & PFDESC_SCTP_COOKIE) { 5885 if (src->state < SCTP_ESTABLISHED) { 5886 pf_set_protostate(*state, psrc, SCTP_ESTABLISHED); 5887 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5888 } 5889 } 5890 if (pd->sctp_flags & (PFDESC_SCTP_SHUTDOWN | PFDESC_SCTP_ABORT | 5891 PFDESC_SCTP_SHUTDOWN_COMPLETE)) { 5892 if (src->state < SCTP_SHUTDOWN_PENDING) { 5893 pf_set_protostate(*state, psrc, SCTP_SHUTDOWN_PENDING); 5894 (*state)->timeout = PFTM_TCP_CLOSING; 5895 } 5896 } 5897 5898 if (src->scrub != NULL) { 5899 if (src->scrub->pfss_v_tag == 0) { 5900 src->scrub->pfss_v_tag = pd->hdr.sctp.v_tag; 5901 } else if (src->scrub->pfss_v_tag != pd->hdr.sctp.v_tag) 5902 return (PF_DROP); 5903 } 5904 5905 (*state)->expire = time_uptime; 5906 5907 /* translate source/destination address, if necessary */ 5908 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5909 uint16_t checksum = 0; 5910 struct pf_state_key *nk = (*state)->key[pd->didx]; 5911 5912 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5913 nk->port[pd->sidx] != pd->hdr.sctp.src_port) { 5914 pf_change_ap(m, pd->src, &pd->hdr.sctp.src_port, 5915 pd->ip_sum, &checksum, &nk->addr[pd->sidx], 5916 nk->port[pd->sidx], 1, pd->af); 5917 } 5918 5919 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5920 nk->port[pd->didx] != pd->hdr.sctp.dest_port) { 5921 pf_change_ap(m, pd->dst, &pd->hdr.sctp.dest_port, 5922 pd->ip_sum, &checksum, &nk->addr[pd->didx], 5923 nk->port[pd->didx], 1, pd->af); 5924 } 5925 } 5926 5927 return (PF_PASS); 5928 } 5929 5930 static void 5931 pf_sctp_multihome_delayed(struct pf_pdesc *pd, int off, struct pfi_kkif *kif, 5932 struct pf_kstate *s) 5933 { 5934 struct pf_sctp_multihome_job *j, *tmp; 5935 int action __unused; 5936 struct pf_kstate *sm = NULL; 5937 struct pf_krule *ra = NULL; 5938 struct pf_krule *r = &V_pf_default_rule; 5939 struct pf_kruleset *rs = NULL; 5940 5941 PF_RULES_RLOCK_TRACKER; 5942 5943 TAILQ_FOREACH_SAFE(j, &pd->sctp_multihome_jobs, next, tmp) { 5944 switch (j->op) { 5945 case SCTP_ADD_IP_ADDRESS: { 5946 j->pd.sctp_flags |= PFDESC_SCTP_ADD_IP; 5947 PF_RULES_RLOCK(); 5948 action = pf_test_rule(&r, &sm, kif, 5949 j->m, off, &j->pd, &ra, &rs, NULL); 5950 PF_RULES_RUNLOCK(); 5951 SDT_PROBE4(pf, sctp, multihome, test, kif, r, j->m, action); 5952 if (sm) { 5953 /* Inherit v_tag values. */ 5954 sm->src.scrub->pfss_v_tag = s->src.scrub->pfss_flags; 5955 sm->dst.scrub->pfss_v_tag = s->dst.scrub->pfss_flags; 5956 PF_STATE_UNLOCK(sm); 5957 } 5958 break; 5959 } 5960 case SCTP_DEL_IP_ADDRESS: { 5961 struct pf_state_key_cmp key; 5962 uint8_t psrc; 5963 5964 bzero(&key, sizeof(key)); 5965 key.af = j->pd.af; 5966 key.proto = IPPROTO_SCTP; 5967 if (j->pd.dir == PF_IN) { /* wire side, straight */ 5968 PF_ACPY(&key.addr[0], j->pd.src, key.af); 5969 PF_ACPY(&key.addr[1], j->pd.dst, key.af); 5970 key.port[0] = j->pd.hdr.sctp.src_port; 5971 key.port[1] = j->pd.hdr.sctp.dest_port; 5972 } else { /* stack side, reverse */ 5973 PF_ACPY(&key.addr[1], j->pd.src, key.af); 5974 PF_ACPY(&key.addr[0], j->pd.dst, key.af); 5975 key.port[1] = j->pd.hdr.sctp.src_port; 5976 key.port[0] = j->pd.hdr.sctp.dest_port; 5977 } 5978 5979 sm = pf_find_state(kif, &key, j->pd.dir); 5980 if (sm != NULL) { 5981 PF_STATE_LOCK_ASSERT(sm); 5982 if (j->pd.dir == sm->direction) { 5983 psrc = PF_PEER_SRC; 5984 } else { 5985 psrc = PF_PEER_DST; 5986 } 5987 pf_set_protostate(sm, psrc, SCTP_SHUTDOWN_PENDING); 5988 sm->timeout = PFTM_TCP_CLOSING; 5989 PF_STATE_UNLOCK(sm); 5990 } 5991 break; 5992 default: 5993 panic("Unknown op %#x", j->op); 5994 } 5995 } 5996 5997 free(j, M_PFTEMP); 5998 } 5999 } 6000 6001 static int 6002 pf_multihome_scan(struct mbuf *m, int start, int len, struct pf_pdesc *pd, 6003 struct pfi_kkif *kif, int op) 6004 { 6005 int off = 0; 6006 struct pf_sctp_multihome_job *job; 6007 6008 while (off < len) { 6009 struct sctp_paramhdr h; 6010 6011 if (!pf_pull_hdr(m, start + off, &h, sizeof(h), NULL, NULL, 6012 pd->af)) 6013 return (PF_DROP); 6014 6015 /* Parameters are at least 4 bytes. */ 6016 if (ntohs(h.param_length) < 4) 6017 return (PF_DROP); 6018 6019 switch (ntohs(h.param_type)) { 6020 case SCTP_IPV4_ADDRESS: { 6021 struct in_addr t; 6022 6023 if (ntohs(h.param_length) != 6024 (sizeof(struct sctp_paramhdr) + sizeof(t))) 6025 return (PF_DROP); 6026 6027 if (!pf_pull_hdr(m, start + off + sizeof(h), &t, sizeof(t), 6028 NULL, NULL, pd->af)) 6029 return (PF_DROP); 6030 6031 /* 6032 * Avoid duplicating states. We'll already have 6033 * created a state based on the source address of 6034 * the packet, but SCTP endpoints may also list this 6035 * address again in the INIT(_ACK) parameters. 6036 */ 6037 if (t.s_addr == pd->src->v4.s_addr) 6038 break; 6039 6040 if (in_nullhost(t)) 6041 t.s_addr = pd->src->v4.s_addr; 6042 6043 /* 6044 * We hold the state lock (idhash) here, which means 6045 * that we can't acquire the keyhash, or we'll get a 6046 * LOR (and potentially double-lock things too). We also 6047 * can't release the state lock here, so instead we'll 6048 * enqueue this for async handling. 6049 * There's a relatively small race here, in that a 6050 * packet using the new addresses could arrive already, 6051 * but that's just though luck for it. 6052 */ 6053 job = malloc(sizeof(*job), M_PFTEMP, M_NOWAIT | M_ZERO); 6054 if (! job) 6055 return (PF_DROP); 6056 6057 memcpy(&job->pd, pd, sizeof(*pd)); 6058 6059 // New source address! 6060 memcpy(&job->src, &t, sizeof(t)); 6061 job->pd.src = &job->src; 6062 memcpy(&job->dst, pd->dst, sizeof(job->dst)); 6063 job->pd.dst = &job->dst; 6064 job->m = m; 6065 job->op = op; 6066 6067 TAILQ_INSERT_TAIL(&pd->sctp_multihome_jobs, job, next); 6068 break; 6069 } 6070 #ifdef INET6 6071 case SCTP_IPV6_ADDRESS: { 6072 struct in6_addr t; 6073 6074 if (ntohs(h.param_length) != 6075 (sizeof(struct sctp_paramhdr) + sizeof(t))) 6076 return (PF_DROP); 6077 6078 if (!pf_pull_hdr(m, start + off + sizeof(h), &t, sizeof(t), 6079 NULL, NULL, pd->af)) 6080 return (PF_DROP); 6081 if (memcmp(&t, &pd->src->v6, sizeof(t)) == 0) 6082 break; 6083 if (memcmp(&t, &in6addr_any, sizeof(t)) == 0) 6084 memcpy(&t, &pd->src->v6, sizeof(t)); 6085 6086 job = malloc(sizeof(*job), M_PFTEMP, M_NOWAIT | M_ZERO); 6087 if (! job) 6088 return (PF_DROP); 6089 6090 memcpy(&job->pd, pd, sizeof(*pd)); 6091 memcpy(&job->src, &t, sizeof(t)); 6092 job->pd.src = &job->src; 6093 memcpy(&job->dst, pd->dst, sizeof(job->dst)); 6094 job->pd.dst = &job->dst; 6095 job->m = m; 6096 job->op = op; 6097 6098 TAILQ_INSERT_TAIL(&pd->sctp_multihome_jobs, job, next); 6099 break; 6100 } 6101 #endif 6102 case SCTP_ADD_IP_ADDRESS: { 6103 int ret; 6104 struct sctp_asconf_paramhdr ah; 6105 6106 if (!pf_pull_hdr(m, start + off, &ah, sizeof(ah), 6107 NULL, NULL, pd->af)) 6108 return (PF_DROP); 6109 6110 ret = pf_multihome_scan(m, start + off + sizeof(ah), 6111 ntohs(ah.ph.param_length) - sizeof(ah), pd, kif, 6112 SCTP_ADD_IP_ADDRESS); 6113 if (ret != PF_PASS) 6114 return (ret); 6115 break; 6116 } 6117 case SCTP_DEL_IP_ADDRESS: { 6118 int ret; 6119 struct sctp_asconf_paramhdr ah; 6120 6121 if (!pf_pull_hdr(m, start + off, &ah, sizeof(ah), 6122 NULL, NULL, pd->af)) 6123 return (PF_DROP); 6124 ret = pf_multihome_scan(m, start + off + sizeof(ah), 6125 ntohs(ah.ph.param_length) - sizeof(ah), pd, kif, 6126 SCTP_DEL_IP_ADDRESS); 6127 if (ret != PF_PASS) 6128 return (ret); 6129 break; 6130 } 6131 default: 6132 break; 6133 } 6134 6135 off += roundup(ntohs(h.param_length), 4); 6136 } 6137 6138 return (PF_PASS); 6139 } 6140 int 6141 pf_multihome_scan_init(struct mbuf *m, int start, int len, struct pf_pdesc *pd, 6142 struct pfi_kkif *kif) 6143 { 6144 start += sizeof(struct sctp_init_chunk); 6145 len -= sizeof(struct sctp_init_chunk); 6146 6147 return (pf_multihome_scan(m, start, len, pd, kif, SCTP_ADD_IP_ADDRESS)); 6148 } 6149 6150 int 6151 pf_multihome_scan_asconf(struct mbuf *m, int start, int len, 6152 struct pf_pdesc *pd, struct pfi_kkif *kif) 6153 { 6154 start += sizeof(struct sctp_asconf_chunk); 6155 len -= sizeof(struct sctp_asconf_chunk); 6156 6157 return (pf_multihome_scan(m, start, len, pd, kif, SCTP_ADD_IP_ADDRESS)); 6158 } 6159 6160 static int 6161 pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, 6162 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 6163 { 6164 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 6165 u_int16_t icmpid = 0, *icmpsum; 6166 u_int8_t icmptype, icmpcode; 6167 int state_icmp = 0; 6168 struct pf_state_key_cmp key; 6169 6170 bzero(&key, sizeof(key)); 6171 switch (pd->proto) { 6172 #ifdef INET 6173 case IPPROTO_ICMP: 6174 icmptype = pd->hdr.icmp.icmp_type; 6175 icmpcode = pd->hdr.icmp.icmp_code; 6176 icmpid = pd->hdr.icmp.icmp_id; 6177 icmpsum = &pd->hdr.icmp.icmp_cksum; 6178 6179 if (icmptype == ICMP_UNREACH || 6180 icmptype == ICMP_SOURCEQUENCH || 6181 icmptype == ICMP_REDIRECT || 6182 icmptype == ICMP_TIMXCEED || 6183 icmptype == ICMP_PARAMPROB) 6184 state_icmp++; 6185 break; 6186 #endif /* INET */ 6187 #ifdef INET6 6188 case IPPROTO_ICMPV6: 6189 icmptype = pd->hdr.icmp6.icmp6_type; 6190 icmpcode = pd->hdr.icmp6.icmp6_code; 6191 icmpid = pd->hdr.icmp6.icmp6_id; 6192 icmpsum = &pd->hdr.icmp6.icmp6_cksum; 6193 6194 if (icmptype == ICMP6_DST_UNREACH || 6195 icmptype == ICMP6_PACKET_TOO_BIG || 6196 icmptype == ICMP6_TIME_EXCEEDED || 6197 icmptype == ICMP6_PARAM_PROB) 6198 state_icmp++; 6199 break; 6200 #endif /* INET6 */ 6201 } 6202 6203 if (!state_icmp) { 6204 /* 6205 * ICMP query/reply message not related to a TCP/UDP packet. 6206 * Search for an ICMP state. 6207 */ 6208 key.af = pd->af; 6209 key.proto = pd->proto; 6210 key.port[0] = key.port[1] = icmpid; 6211 if (pd->dir == PF_IN) { /* wire side, straight */ 6212 PF_ACPY(&key.addr[0], pd->src, key.af); 6213 PF_ACPY(&key.addr[1], pd->dst, key.af); 6214 } else { /* stack side, reverse */ 6215 PF_ACPY(&key.addr[1], pd->src, key.af); 6216 PF_ACPY(&key.addr[0], pd->dst, key.af); 6217 } 6218 6219 STATE_LOOKUP(kif, &key, *state, pd); 6220 6221 (*state)->expire = time_uptime; 6222 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 6223 6224 /* translate source/destination address, if necessary */ 6225 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 6226 struct pf_state_key *nk = (*state)->key[pd->didx]; 6227 6228 switch (pd->af) { 6229 #ifdef INET 6230 case AF_INET: 6231 if (PF_ANEQ(pd->src, 6232 &nk->addr[pd->sidx], AF_INET)) 6233 pf_change_a(&saddr->v4.s_addr, 6234 pd->ip_sum, 6235 nk->addr[pd->sidx].v4.s_addr, 0); 6236 6237 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 6238 AF_INET)) 6239 pf_change_a(&daddr->v4.s_addr, 6240 pd->ip_sum, 6241 nk->addr[pd->didx].v4.s_addr, 0); 6242 6243 if (nk->port[0] != 6244 pd->hdr.icmp.icmp_id) { 6245 pd->hdr.icmp.icmp_cksum = 6246 pf_cksum_fixup( 6247 pd->hdr.icmp.icmp_cksum, icmpid, 6248 nk->port[pd->sidx], 0); 6249 pd->hdr.icmp.icmp_id = 6250 nk->port[pd->sidx]; 6251 } 6252 6253 m_copyback(m, off, ICMP_MINLEN, 6254 (caddr_t )&pd->hdr.icmp); 6255 break; 6256 #endif /* INET */ 6257 #ifdef INET6 6258 case AF_INET6: 6259 if (PF_ANEQ(pd->src, 6260 &nk->addr[pd->sidx], AF_INET6)) 6261 pf_change_a6(saddr, 6262 &pd->hdr.icmp6.icmp6_cksum, 6263 &nk->addr[pd->sidx], 0); 6264 6265 if (PF_ANEQ(pd->dst, 6266 &nk->addr[pd->didx], AF_INET6)) 6267 pf_change_a6(daddr, 6268 &pd->hdr.icmp6.icmp6_cksum, 6269 &nk->addr[pd->didx], 0); 6270 6271 m_copyback(m, off, sizeof(struct icmp6_hdr), 6272 (caddr_t )&pd->hdr.icmp6); 6273 break; 6274 #endif /* INET6 */ 6275 } 6276 } 6277 return (PF_PASS); 6278 6279 } else { 6280 /* 6281 * ICMP error message in response to a TCP/UDP packet. 6282 * Extract the inner TCP/UDP header and search for that state. 6283 */ 6284 6285 struct pf_pdesc pd2; 6286 bzero(&pd2, sizeof pd2); 6287 #ifdef INET 6288 struct ip h2; 6289 #endif /* INET */ 6290 #ifdef INET6 6291 struct ip6_hdr h2_6; 6292 int terminal = 0; 6293 #endif /* INET6 */ 6294 int ipoff2 = 0; 6295 int off2 = 0; 6296 6297 pd2.af = pd->af; 6298 /* Payload packet is from the opposite direction. */ 6299 pd2.sidx = (pd->dir == PF_IN) ? 1 : 0; 6300 pd2.didx = (pd->dir == PF_IN) ? 0 : 1; 6301 switch (pd->af) { 6302 #ifdef INET 6303 case AF_INET: 6304 /* offset of h2 in mbuf chain */ 6305 ipoff2 = off + ICMP_MINLEN; 6306 6307 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 6308 NULL, reason, pd2.af)) { 6309 DPFPRINTF(PF_DEBUG_MISC, 6310 ("pf: ICMP error message too short " 6311 "(ip)\n")); 6312 return (PF_DROP); 6313 } 6314 /* 6315 * ICMP error messages don't refer to non-first 6316 * fragments 6317 */ 6318 if (h2.ip_off & htons(IP_OFFMASK)) { 6319 REASON_SET(reason, PFRES_FRAG); 6320 return (PF_DROP); 6321 } 6322 6323 /* offset of protocol header that follows h2 */ 6324 off2 = ipoff2 + (h2.ip_hl << 2); 6325 6326 pd2.proto = h2.ip_p; 6327 pd2.src = (struct pf_addr *)&h2.ip_src; 6328 pd2.dst = (struct pf_addr *)&h2.ip_dst; 6329 pd2.ip_sum = &h2.ip_sum; 6330 break; 6331 #endif /* INET */ 6332 #ifdef INET6 6333 case AF_INET6: 6334 ipoff2 = off + sizeof(struct icmp6_hdr); 6335 6336 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 6337 NULL, reason, pd2.af)) { 6338 DPFPRINTF(PF_DEBUG_MISC, 6339 ("pf: ICMP error message too short " 6340 "(ip6)\n")); 6341 return (PF_DROP); 6342 } 6343 pd2.proto = h2_6.ip6_nxt; 6344 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 6345 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 6346 pd2.ip_sum = NULL; 6347 off2 = ipoff2 + sizeof(h2_6); 6348 do { 6349 switch (pd2.proto) { 6350 case IPPROTO_FRAGMENT: 6351 /* 6352 * ICMPv6 error messages for 6353 * non-first fragments 6354 */ 6355 REASON_SET(reason, PFRES_FRAG); 6356 return (PF_DROP); 6357 case IPPROTO_AH: 6358 case IPPROTO_HOPOPTS: 6359 case IPPROTO_ROUTING: 6360 case IPPROTO_DSTOPTS: { 6361 /* get next header and header length */ 6362 struct ip6_ext opt6; 6363 6364 if (!pf_pull_hdr(m, off2, &opt6, 6365 sizeof(opt6), NULL, reason, 6366 pd2.af)) { 6367 DPFPRINTF(PF_DEBUG_MISC, 6368 ("pf: ICMPv6 short opt\n")); 6369 return (PF_DROP); 6370 } 6371 if (pd2.proto == IPPROTO_AH) 6372 off2 += (opt6.ip6e_len + 2) * 4; 6373 else 6374 off2 += (opt6.ip6e_len + 1) * 8; 6375 pd2.proto = opt6.ip6e_nxt; 6376 /* goto the next header */ 6377 break; 6378 } 6379 default: 6380 terminal++; 6381 break; 6382 } 6383 } while (!terminal); 6384 break; 6385 #endif /* INET6 */ 6386 } 6387 6388 if (PF_ANEQ(pd->dst, pd2.src, pd->af)) { 6389 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6390 printf("pf: BAD ICMP %d:%d outer dst: ", 6391 icmptype, icmpcode); 6392 pf_print_host(pd->src, 0, pd->af); 6393 printf(" -> "); 6394 pf_print_host(pd->dst, 0, pd->af); 6395 printf(" inner src: "); 6396 pf_print_host(pd2.src, 0, pd2.af); 6397 printf(" -> "); 6398 pf_print_host(pd2.dst, 0, pd2.af); 6399 printf("\n"); 6400 } 6401 REASON_SET(reason, PFRES_BADSTATE); 6402 return (PF_DROP); 6403 } 6404 6405 switch (pd2.proto) { 6406 case IPPROTO_TCP: { 6407 struct tcphdr th; 6408 u_int32_t seq; 6409 struct pf_state_peer *src, *dst; 6410 u_int8_t dws; 6411 int copyback = 0; 6412 6413 /* 6414 * Only the first 8 bytes of the TCP header can be 6415 * expected. Don't access any TCP header fields after 6416 * th_seq, an ackskew test is not possible. 6417 */ 6418 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 6419 pd2.af)) { 6420 DPFPRINTF(PF_DEBUG_MISC, 6421 ("pf: ICMP error message too short " 6422 "(tcp)\n")); 6423 return (PF_DROP); 6424 } 6425 6426 key.af = pd2.af; 6427 key.proto = IPPROTO_TCP; 6428 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6429 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6430 key.port[pd2.sidx] = th.th_sport; 6431 key.port[pd2.didx] = th.th_dport; 6432 6433 STATE_LOOKUP(kif, &key, *state, pd); 6434 6435 if (pd->dir == (*state)->direction) { 6436 src = &(*state)->dst; 6437 dst = &(*state)->src; 6438 } else { 6439 src = &(*state)->src; 6440 dst = &(*state)->dst; 6441 } 6442 6443 if (src->wscale && dst->wscale) 6444 dws = dst->wscale & PF_WSCALE_MASK; 6445 else 6446 dws = 0; 6447 6448 /* Demodulate sequence number */ 6449 seq = ntohl(th.th_seq) - src->seqdiff; 6450 if (src->seqdiff) { 6451 pf_change_a(&th.th_seq, icmpsum, 6452 htonl(seq), 0); 6453 copyback = 1; 6454 } 6455 6456 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 6457 (!SEQ_GEQ(src->seqhi, seq) || 6458 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 6459 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6460 printf("pf: BAD ICMP %d:%d ", 6461 icmptype, icmpcode); 6462 pf_print_host(pd->src, 0, pd->af); 6463 printf(" -> "); 6464 pf_print_host(pd->dst, 0, pd->af); 6465 printf(" state: "); 6466 pf_print_state(*state); 6467 printf(" seq=%u\n", seq); 6468 } 6469 REASON_SET(reason, PFRES_BADSTATE); 6470 return (PF_DROP); 6471 } else { 6472 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6473 printf("pf: OK ICMP %d:%d ", 6474 icmptype, icmpcode); 6475 pf_print_host(pd->src, 0, pd->af); 6476 printf(" -> "); 6477 pf_print_host(pd->dst, 0, pd->af); 6478 printf(" state: "); 6479 pf_print_state(*state); 6480 printf(" seq=%u\n", seq); 6481 } 6482 } 6483 6484 /* translate source/destination address, if necessary */ 6485 if ((*state)->key[PF_SK_WIRE] != 6486 (*state)->key[PF_SK_STACK]) { 6487 struct pf_state_key *nk = 6488 (*state)->key[pd->didx]; 6489 6490 if (PF_ANEQ(pd2.src, 6491 &nk->addr[pd2.sidx], pd2.af) || 6492 nk->port[pd2.sidx] != th.th_sport) 6493 pf_change_icmp(pd2.src, &th.th_sport, 6494 daddr, &nk->addr[pd2.sidx], 6495 nk->port[pd2.sidx], NULL, 6496 pd2.ip_sum, icmpsum, 6497 pd->ip_sum, 0, pd2.af); 6498 6499 if (PF_ANEQ(pd2.dst, 6500 &nk->addr[pd2.didx], pd2.af) || 6501 nk->port[pd2.didx] != th.th_dport) 6502 pf_change_icmp(pd2.dst, &th.th_dport, 6503 saddr, &nk->addr[pd2.didx], 6504 nk->port[pd2.didx], NULL, 6505 pd2.ip_sum, icmpsum, 6506 pd->ip_sum, 0, pd2.af); 6507 copyback = 1; 6508 } 6509 6510 if (copyback) { 6511 switch (pd2.af) { 6512 #ifdef INET 6513 case AF_INET: 6514 m_copyback(m, off, ICMP_MINLEN, 6515 (caddr_t )&pd->hdr.icmp); 6516 m_copyback(m, ipoff2, sizeof(h2), 6517 (caddr_t )&h2); 6518 break; 6519 #endif /* INET */ 6520 #ifdef INET6 6521 case AF_INET6: 6522 m_copyback(m, off, 6523 sizeof(struct icmp6_hdr), 6524 (caddr_t )&pd->hdr.icmp6); 6525 m_copyback(m, ipoff2, sizeof(h2_6), 6526 (caddr_t )&h2_6); 6527 break; 6528 #endif /* INET6 */ 6529 } 6530 m_copyback(m, off2, 8, (caddr_t)&th); 6531 } 6532 6533 return (PF_PASS); 6534 break; 6535 } 6536 case IPPROTO_UDP: { 6537 struct udphdr uh; 6538 6539 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 6540 NULL, reason, pd2.af)) { 6541 DPFPRINTF(PF_DEBUG_MISC, 6542 ("pf: ICMP error message too short " 6543 "(udp)\n")); 6544 return (PF_DROP); 6545 } 6546 6547 key.af = pd2.af; 6548 key.proto = IPPROTO_UDP; 6549 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6550 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6551 key.port[pd2.sidx] = uh.uh_sport; 6552 key.port[pd2.didx] = uh.uh_dport; 6553 6554 STATE_LOOKUP(kif, &key, *state, pd); 6555 6556 /* translate source/destination address, if necessary */ 6557 if ((*state)->key[PF_SK_WIRE] != 6558 (*state)->key[PF_SK_STACK]) { 6559 struct pf_state_key *nk = 6560 (*state)->key[pd->didx]; 6561 6562 if (PF_ANEQ(pd2.src, 6563 &nk->addr[pd2.sidx], pd2.af) || 6564 nk->port[pd2.sidx] != uh.uh_sport) 6565 pf_change_icmp(pd2.src, &uh.uh_sport, 6566 daddr, &nk->addr[pd2.sidx], 6567 nk->port[pd2.sidx], &uh.uh_sum, 6568 pd2.ip_sum, icmpsum, 6569 pd->ip_sum, 1, pd2.af); 6570 6571 if (PF_ANEQ(pd2.dst, 6572 &nk->addr[pd2.didx], pd2.af) || 6573 nk->port[pd2.didx] != uh.uh_dport) 6574 pf_change_icmp(pd2.dst, &uh.uh_dport, 6575 saddr, &nk->addr[pd2.didx], 6576 nk->port[pd2.didx], &uh.uh_sum, 6577 pd2.ip_sum, icmpsum, 6578 pd->ip_sum, 1, pd2.af); 6579 6580 switch (pd2.af) { 6581 #ifdef INET 6582 case AF_INET: 6583 m_copyback(m, off, ICMP_MINLEN, 6584 (caddr_t )&pd->hdr.icmp); 6585 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 6586 break; 6587 #endif /* INET */ 6588 #ifdef INET6 6589 case AF_INET6: 6590 m_copyback(m, off, 6591 sizeof(struct icmp6_hdr), 6592 (caddr_t )&pd->hdr.icmp6); 6593 m_copyback(m, ipoff2, sizeof(h2_6), 6594 (caddr_t )&h2_6); 6595 break; 6596 #endif /* INET6 */ 6597 } 6598 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 6599 } 6600 return (PF_PASS); 6601 break; 6602 } 6603 #ifdef INET 6604 case IPPROTO_ICMP: { 6605 struct icmp iih; 6606 6607 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 6608 NULL, reason, pd2.af)) { 6609 DPFPRINTF(PF_DEBUG_MISC, 6610 ("pf: ICMP error message too short i" 6611 "(icmp)\n")); 6612 return (PF_DROP); 6613 } 6614 6615 key.af = pd2.af; 6616 key.proto = IPPROTO_ICMP; 6617 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6618 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6619 key.port[0] = key.port[1] = iih.icmp_id; 6620 6621 STATE_LOOKUP(kif, &key, *state, pd); 6622 6623 /* translate source/destination address, if necessary */ 6624 if ((*state)->key[PF_SK_WIRE] != 6625 (*state)->key[PF_SK_STACK]) { 6626 struct pf_state_key *nk = 6627 (*state)->key[pd->didx]; 6628 6629 if (PF_ANEQ(pd2.src, 6630 &nk->addr[pd2.sidx], pd2.af) || 6631 nk->port[pd2.sidx] != iih.icmp_id) 6632 pf_change_icmp(pd2.src, &iih.icmp_id, 6633 daddr, &nk->addr[pd2.sidx], 6634 nk->port[pd2.sidx], NULL, 6635 pd2.ip_sum, icmpsum, 6636 pd->ip_sum, 0, AF_INET); 6637 6638 if (PF_ANEQ(pd2.dst, 6639 &nk->addr[pd2.didx], pd2.af) || 6640 nk->port[pd2.didx] != iih.icmp_id) 6641 pf_change_icmp(pd2.dst, &iih.icmp_id, 6642 saddr, &nk->addr[pd2.didx], 6643 nk->port[pd2.didx], NULL, 6644 pd2.ip_sum, icmpsum, 6645 pd->ip_sum, 0, AF_INET); 6646 6647 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); 6648 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 6649 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 6650 } 6651 return (PF_PASS); 6652 break; 6653 } 6654 #endif /* INET */ 6655 #ifdef INET6 6656 case IPPROTO_ICMPV6: { 6657 struct icmp6_hdr iih; 6658 6659 if (!pf_pull_hdr(m, off2, &iih, 6660 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 6661 DPFPRINTF(PF_DEBUG_MISC, 6662 ("pf: ICMP error message too short " 6663 "(icmp6)\n")); 6664 return (PF_DROP); 6665 } 6666 6667 key.af = pd2.af; 6668 key.proto = IPPROTO_ICMPV6; 6669 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6670 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6671 key.port[0] = key.port[1] = iih.icmp6_id; 6672 6673 STATE_LOOKUP(kif, &key, *state, pd); 6674 6675 /* translate source/destination address, if necessary */ 6676 if ((*state)->key[PF_SK_WIRE] != 6677 (*state)->key[PF_SK_STACK]) { 6678 struct pf_state_key *nk = 6679 (*state)->key[pd->didx]; 6680 6681 if (PF_ANEQ(pd2.src, 6682 &nk->addr[pd2.sidx], pd2.af) || 6683 nk->port[pd2.sidx] != iih.icmp6_id) 6684 pf_change_icmp(pd2.src, &iih.icmp6_id, 6685 daddr, &nk->addr[pd2.sidx], 6686 nk->port[pd2.sidx], NULL, 6687 pd2.ip_sum, icmpsum, 6688 pd->ip_sum, 0, AF_INET6); 6689 6690 if (PF_ANEQ(pd2.dst, 6691 &nk->addr[pd2.didx], pd2.af) || 6692 nk->port[pd2.didx] != iih.icmp6_id) 6693 pf_change_icmp(pd2.dst, &iih.icmp6_id, 6694 saddr, &nk->addr[pd2.didx], 6695 nk->port[pd2.didx], NULL, 6696 pd2.ip_sum, icmpsum, 6697 pd->ip_sum, 0, AF_INET6); 6698 6699 m_copyback(m, off, sizeof(struct icmp6_hdr), 6700 (caddr_t)&pd->hdr.icmp6); 6701 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 6702 m_copyback(m, off2, sizeof(struct icmp6_hdr), 6703 (caddr_t)&iih); 6704 } 6705 return (PF_PASS); 6706 break; 6707 } 6708 #endif /* INET6 */ 6709 default: { 6710 key.af = pd2.af; 6711 key.proto = pd2.proto; 6712 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6713 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6714 key.port[0] = key.port[1] = 0; 6715 6716 STATE_LOOKUP(kif, &key, *state, pd); 6717 6718 /* translate source/destination address, if necessary */ 6719 if ((*state)->key[PF_SK_WIRE] != 6720 (*state)->key[PF_SK_STACK]) { 6721 struct pf_state_key *nk = 6722 (*state)->key[pd->didx]; 6723 6724 if (PF_ANEQ(pd2.src, 6725 &nk->addr[pd2.sidx], pd2.af)) 6726 pf_change_icmp(pd2.src, NULL, daddr, 6727 &nk->addr[pd2.sidx], 0, NULL, 6728 pd2.ip_sum, icmpsum, 6729 pd->ip_sum, 0, pd2.af); 6730 6731 if (PF_ANEQ(pd2.dst, 6732 &nk->addr[pd2.didx], pd2.af)) 6733 pf_change_icmp(pd2.dst, NULL, saddr, 6734 &nk->addr[pd2.didx], 0, NULL, 6735 pd2.ip_sum, icmpsum, 6736 pd->ip_sum, 0, pd2.af); 6737 6738 switch (pd2.af) { 6739 #ifdef INET 6740 case AF_INET: 6741 m_copyback(m, off, ICMP_MINLEN, 6742 (caddr_t)&pd->hdr.icmp); 6743 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 6744 break; 6745 #endif /* INET */ 6746 #ifdef INET6 6747 case AF_INET6: 6748 m_copyback(m, off, 6749 sizeof(struct icmp6_hdr), 6750 (caddr_t )&pd->hdr.icmp6); 6751 m_copyback(m, ipoff2, sizeof(h2_6), 6752 (caddr_t )&h2_6); 6753 break; 6754 #endif /* INET6 */ 6755 } 6756 } 6757 return (PF_PASS); 6758 break; 6759 } 6760 } 6761 } 6762 } 6763 6764 static int 6765 pf_test_state_other(struct pf_kstate **state, struct pfi_kkif *kif, 6766 struct mbuf *m, struct pf_pdesc *pd) 6767 { 6768 struct pf_state_peer *src, *dst; 6769 struct pf_state_key_cmp key; 6770 uint8_t psrc, pdst; 6771 6772 bzero(&key, sizeof(key)); 6773 key.af = pd->af; 6774 key.proto = pd->proto; 6775 if (pd->dir == PF_IN) { 6776 PF_ACPY(&key.addr[0], pd->src, key.af); 6777 PF_ACPY(&key.addr[1], pd->dst, key.af); 6778 key.port[0] = key.port[1] = 0; 6779 } else { 6780 PF_ACPY(&key.addr[1], pd->src, key.af); 6781 PF_ACPY(&key.addr[0], pd->dst, key.af); 6782 key.port[1] = key.port[0] = 0; 6783 } 6784 6785 STATE_LOOKUP(kif, &key, *state, pd); 6786 6787 if (pd->dir == (*state)->direction) { 6788 src = &(*state)->src; 6789 dst = &(*state)->dst; 6790 psrc = PF_PEER_SRC; 6791 pdst = PF_PEER_DST; 6792 } else { 6793 src = &(*state)->dst; 6794 dst = &(*state)->src; 6795 psrc = PF_PEER_DST; 6796 pdst = PF_PEER_SRC; 6797 } 6798 6799 /* update states */ 6800 if (src->state < PFOTHERS_SINGLE) 6801 pf_set_protostate(*state, psrc, PFOTHERS_SINGLE); 6802 if (dst->state == PFOTHERS_SINGLE) 6803 pf_set_protostate(*state, pdst, PFOTHERS_MULTIPLE); 6804 6805 /* update expire time */ 6806 (*state)->expire = time_uptime; 6807 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 6808 (*state)->timeout = PFTM_OTHER_MULTIPLE; 6809 else 6810 (*state)->timeout = PFTM_OTHER_SINGLE; 6811 6812 /* translate source/destination address, if necessary */ 6813 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 6814 struct pf_state_key *nk = (*state)->key[pd->didx]; 6815 6816 KASSERT(nk, ("%s: nk is null", __func__)); 6817 KASSERT(pd, ("%s: pd is null", __func__)); 6818 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 6819 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 6820 switch (pd->af) { 6821 #ifdef INET 6822 case AF_INET: 6823 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 6824 pf_change_a(&pd->src->v4.s_addr, 6825 pd->ip_sum, 6826 nk->addr[pd->sidx].v4.s_addr, 6827 0); 6828 6829 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 6830 pf_change_a(&pd->dst->v4.s_addr, 6831 pd->ip_sum, 6832 nk->addr[pd->didx].v4.s_addr, 6833 0); 6834 6835 break; 6836 #endif /* INET */ 6837 #ifdef INET6 6838 case AF_INET6: 6839 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 6840 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 6841 6842 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 6843 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 6844 #endif /* INET6 */ 6845 } 6846 } 6847 return (PF_PASS); 6848 } 6849 6850 /* 6851 * ipoff and off are measured from the start of the mbuf chain. 6852 * h must be at "ipoff" on the mbuf chain. 6853 */ 6854 void * 6855 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 6856 u_short *actionp, u_short *reasonp, sa_family_t af) 6857 { 6858 switch (af) { 6859 #ifdef INET 6860 case AF_INET: { 6861 struct ip *h = mtod(m, struct ip *); 6862 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 6863 6864 if (fragoff) { 6865 if (fragoff >= len) 6866 ACTION_SET(actionp, PF_PASS); 6867 else { 6868 ACTION_SET(actionp, PF_DROP); 6869 REASON_SET(reasonp, PFRES_FRAG); 6870 } 6871 return (NULL); 6872 } 6873 if (m->m_pkthdr.len < off + len || 6874 ntohs(h->ip_len) < off + len) { 6875 ACTION_SET(actionp, PF_DROP); 6876 REASON_SET(reasonp, PFRES_SHORT); 6877 return (NULL); 6878 } 6879 break; 6880 } 6881 #endif /* INET */ 6882 #ifdef INET6 6883 case AF_INET6: { 6884 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 6885 6886 if (m->m_pkthdr.len < off + len || 6887 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 6888 (unsigned)(off + len)) { 6889 ACTION_SET(actionp, PF_DROP); 6890 REASON_SET(reasonp, PFRES_SHORT); 6891 return (NULL); 6892 } 6893 break; 6894 } 6895 #endif /* INET6 */ 6896 } 6897 m_copydata(m, off, len, p); 6898 return (p); 6899 } 6900 6901 int 6902 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kkif *kif, 6903 int rtableid) 6904 { 6905 struct ifnet *ifp; 6906 6907 /* 6908 * Skip check for addresses with embedded interface scope, 6909 * as they would always match anyway. 6910 */ 6911 if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6)) 6912 return (1); 6913 6914 if (af != AF_INET && af != AF_INET6) 6915 return (0); 6916 6917 /* Skip checks for ipsec interfaces */ 6918 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 6919 return (1); 6920 6921 ifp = (kif != NULL) ? kif->pfik_ifp : NULL; 6922 6923 switch (af) { 6924 #ifdef INET6 6925 case AF_INET6: 6926 return (fib6_check_urpf(rtableid, &addr->v6, 0, NHR_NONE, 6927 ifp)); 6928 #endif 6929 #ifdef INET 6930 case AF_INET: 6931 return (fib4_check_urpf(rtableid, addr->v4, 0, NHR_NONE, 6932 ifp)); 6933 #endif 6934 } 6935 6936 return (0); 6937 } 6938 6939 #ifdef INET 6940 static void 6941 pf_route(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, 6942 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) 6943 { 6944 struct mbuf *m0, *m1, *md; 6945 struct sockaddr_in dst; 6946 struct ip *ip; 6947 struct pfi_kkif *nkif = NULL; 6948 struct ifnet *ifp = NULL; 6949 struct pf_addr naddr; 6950 struct pf_ksrc_node *sn = NULL; 6951 int error = 0; 6952 uint16_t ip_len, ip_off; 6953 int r_rt, r_dir; 6954 6955 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 6956 6957 if (s) { 6958 r_rt = s->rt; 6959 r_dir = s->direction; 6960 } else { 6961 r_rt = r->rt; 6962 r_dir = r->direction; 6963 } 6964 6965 KASSERT(pd->dir == PF_IN || pd->dir == PF_OUT || 6966 r_dir == PF_IN || r_dir == PF_OUT, ("%s: invalid direction", 6967 __func__)); 6968 6969 if ((pd->pf_mtag == NULL && 6970 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 6971 pd->pf_mtag->routed++ > 3) { 6972 m0 = *m; 6973 *m = NULL; 6974 goto bad_locked; 6975 } 6976 6977 if (r_rt == PF_DUPTO) { 6978 if ((pd->pf_mtag->flags & PF_MTAG_FLAG_DUPLICATED)) { 6979 if (s == NULL) { 6980 ifp = r->rpool.cur->kif ? 6981 r->rpool.cur->kif->pfik_ifp : NULL; 6982 } else { 6983 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6984 /* If pfsync'd */ 6985 if (ifp == NULL) 6986 ifp = r->rpool.cur->kif ? 6987 r->rpool.cur->kif->pfik_ifp : NULL; 6988 PF_STATE_UNLOCK(s); 6989 } 6990 if (ifp == oifp) { 6991 /* When the 2nd interface is not skipped */ 6992 return; 6993 } else { 6994 m0 = *m; 6995 *m = NULL; 6996 goto bad; 6997 } 6998 } else { 6999 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUPLICATED; 7000 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { 7001 if (s) 7002 PF_STATE_UNLOCK(s); 7003 return; 7004 } 7005 } 7006 } else { 7007 if ((r_rt == PF_REPLYTO) == (r_dir == pd->dir)) { 7008 pf_dummynet(pd, s, r, m); 7009 if (s) 7010 PF_STATE_UNLOCK(s); 7011 return; 7012 } 7013 m0 = *m; 7014 } 7015 7016 ip = mtod(m0, struct ip *); 7017 7018 bzero(&dst, sizeof(dst)); 7019 dst.sin_family = AF_INET; 7020 dst.sin_len = sizeof(dst); 7021 dst.sin_addr = ip->ip_dst; 7022 7023 bzero(&naddr, sizeof(naddr)); 7024 7025 if (s == NULL) { 7026 if (TAILQ_EMPTY(&r->rpool.list)) { 7027 DPFPRINTF(PF_DEBUG_URGENT, 7028 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 7029 goto bad_locked; 7030 } 7031 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 7032 &naddr, &nkif, NULL, &sn); 7033 if (!PF_AZERO(&naddr, AF_INET)) 7034 dst.sin_addr.s_addr = naddr.v4.s_addr; 7035 ifp = nkif ? nkif->pfik_ifp : NULL; 7036 } else { 7037 if (!PF_AZERO(&s->rt_addr, AF_INET)) 7038 dst.sin_addr.s_addr = 7039 s->rt_addr.v4.s_addr; 7040 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7041 /* If pfsync'd */ 7042 if (ifp == NULL) 7043 ifp = r->rpool.cur->kif ? 7044 r->rpool.cur->kif->pfik_ifp : NULL; 7045 PF_STATE_UNLOCK(s); 7046 } 7047 7048 if (ifp == NULL) 7049 goto bad; 7050 7051 if (pd->dir == PF_IN) { 7052 if (pf_test(PF_OUT, 0, ifp, &m0, inp, &pd->act) != PF_PASS) 7053 goto bad; 7054 else if (m0 == NULL) 7055 goto done; 7056 if (m0->m_len < sizeof(struct ip)) { 7057 DPFPRINTF(PF_DEBUG_URGENT, 7058 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 7059 goto bad; 7060 } 7061 ip = mtod(m0, struct ip *); 7062 } 7063 7064 if (ifp->if_flags & IFF_LOOPBACK) 7065 m0->m_flags |= M_SKIP_FIREWALL; 7066 7067 ip_len = ntohs(ip->ip_len); 7068 ip_off = ntohs(ip->ip_off); 7069 7070 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 7071 m0->m_pkthdr.csum_flags |= CSUM_IP; 7072 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 7073 in_delayed_cksum(m0); 7074 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 7075 } 7076 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 7077 pf_sctp_checksum(m0, (uint32_t)(ip->ip_hl << 2)); 7078 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 7079 } 7080 7081 /* 7082 * If small enough for interface, or the interface will take 7083 * care of the fragmentation for us, we can just send directly. 7084 */ 7085 if (ip_len <= ifp->if_mtu || 7086 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 7087 ip->ip_sum = 0; 7088 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 7089 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 7090 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 7091 } 7092 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 7093 7094 md = m0; 7095 error = pf_dummynet_route(pd, s, r, ifp, sintosa(&dst), &md); 7096 if (md != NULL) 7097 error = (*ifp->if_output)(ifp, md, sintosa(&dst), NULL); 7098 goto done; 7099 } 7100 7101 /* Balk when DF bit is set or the interface didn't support TSO. */ 7102 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 7103 error = EMSGSIZE; 7104 KMOD_IPSTAT_INC(ips_cantfrag); 7105 if (r_rt != PF_DUPTO) { 7106 if (s && pd->nat_rule != NULL) 7107 PACKET_UNDO_NAT(m0, pd, 7108 (ip->ip_hl << 2) + (ip_off & IP_OFFMASK), 7109 s); 7110 7111 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 7112 ifp->if_mtu); 7113 goto done; 7114 } else 7115 goto bad; 7116 } 7117 7118 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 7119 if (error) 7120 goto bad; 7121 7122 for (; m0; m0 = m1) { 7123 m1 = m0->m_nextpkt; 7124 m0->m_nextpkt = NULL; 7125 if (error == 0) { 7126 m_clrprotoflags(m0); 7127 md = m0; 7128 error = pf_dummynet_route(pd, s, r, ifp, 7129 sintosa(&dst), &md); 7130 if (md != NULL) 7131 error = (*ifp->if_output)(ifp, md, 7132 sintosa(&dst), NULL); 7133 } else 7134 m_freem(m0); 7135 } 7136 7137 if (error == 0) 7138 KMOD_IPSTAT_INC(ips_fragmented); 7139 7140 done: 7141 if (r_rt != PF_DUPTO) 7142 *m = NULL; 7143 return; 7144 7145 bad_locked: 7146 if (s) 7147 PF_STATE_UNLOCK(s); 7148 bad: 7149 m_freem(m0); 7150 goto done; 7151 } 7152 #endif /* INET */ 7153 7154 #ifdef INET6 7155 static void 7156 pf_route6(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, 7157 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) 7158 { 7159 struct mbuf *m0, *md; 7160 struct sockaddr_in6 dst; 7161 struct ip6_hdr *ip6; 7162 struct pfi_kkif *nkif = NULL; 7163 struct ifnet *ifp = NULL; 7164 struct pf_addr naddr; 7165 struct pf_ksrc_node *sn = NULL; 7166 int r_rt, r_dir; 7167 7168 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 7169 7170 if (s) { 7171 r_rt = s->rt; 7172 r_dir = s->direction; 7173 } else { 7174 r_rt = r->rt; 7175 r_dir = r->direction; 7176 } 7177 7178 KASSERT(pd->dir == PF_IN || pd->dir == PF_OUT || 7179 r_dir == PF_IN || r_dir == PF_OUT, ("%s: invalid direction", 7180 __func__)); 7181 7182 if ((pd->pf_mtag == NULL && 7183 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 7184 pd->pf_mtag->routed++ > 3) { 7185 m0 = *m; 7186 *m = NULL; 7187 goto bad_locked; 7188 } 7189 7190 if (r_rt == PF_DUPTO) { 7191 if ((pd->pf_mtag->flags & PF_MTAG_FLAG_DUPLICATED)) { 7192 if (s == NULL) { 7193 ifp = r->rpool.cur->kif ? 7194 r->rpool.cur->kif->pfik_ifp : NULL; 7195 } else { 7196 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7197 /* If pfsync'd */ 7198 if (ifp == NULL) 7199 ifp = r->rpool.cur->kif ? 7200 r->rpool.cur->kif->pfik_ifp : NULL; 7201 PF_STATE_UNLOCK(s); 7202 } 7203 if (ifp == oifp) { 7204 /* When the 2nd interface is not skipped */ 7205 return; 7206 } else { 7207 m0 = *m; 7208 *m = NULL; 7209 goto bad; 7210 } 7211 } else { 7212 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUPLICATED; 7213 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { 7214 if (s) 7215 PF_STATE_UNLOCK(s); 7216 return; 7217 } 7218 } 7219 } else { 7220 if ((r_rt == PF_REPLYTO) == (r_dir == pd->dir)) { 7221 pf_dummynet(pd, s, r, m); 7222 if (s) 7223 PF_STATE_UNLOCK(s); 7224 return; 7225 } 7226 m0 = *m; 7227 } 7228 7229 ip6 = mtod(m0, struct ip6_hdr *); 7230 7231 bzero(&dst, sizeof(dst)); 7232 dst.sin6_family = AF_INET6; 7233 dst.sin6_len = sizeof(dst); 7234 dst.sin6_addr = ip6->ip6_dst; 7235 7236 bzero(&naddr, sizeof(naddr)); 7237 7238 if (s == NULL) { 7239 if (TAILQ_EMPTY(&r->rpool.list)) { 7240 DPFPRINTF(PF_DEBUG_URGENT, 7241 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 7242 goto bad_locked; 7243 } 7244 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 7245 &naddr, &nkif, NULL, &sn); 7246 if (!PF_AZERO(&naddr, AF_INET6)) 7247 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 7248 &naddr, AF_INET6); 7249 ifp = nkif ? nkif->pfik_ifp : NULL; 7250 } else { 7251 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 7252 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 7253 &s->rt_addr, AF_INET6); 7254 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7255 /* If pfsync'd */ 7256 if (ifp == NULL) 7257 ifp = r->rpool.cur->kif ? 7258 r->rpool.cur->kif->pfik_ifp : NULL; 7259 } 7260 7261 if (s) 7262 PF_STATE_UNLOCK(s); 7263 7264 if (ifp == NULL) 7265 goto bad; 7266 7267 if (pd->dir == PF_IN) { 7268 if (pf_test6(PF_OUT, 0, ifp, &m0, inp, &pd->act) != PF_PASS) 7269 goto bad; 7270 else if (m0 == NULL) 7271 goto done; 7272 if (m0->m_len < sizeof(struct ip6_hdr)) { 7273 DPFPRINTF(PF_DEBUG_URGENT, 7274 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 7275 __func__)); 7276 goto bad; 7277 } 7278 ip6 = mtod(m0, struct ip6_hdr *); 7279 } 7280 7281 if (ifp->if_flags & IFF_LOOPBACK) 7282 m0->m_flags |= M_SKIP_FIREWALL; 7283 7284 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 & 7285 ~ifp->if_hwassist) { 7286 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6); 7287 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr)); 7288 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 7289 } 7290 7291 /* 7292 * If the packet is too large for the outgoing interface, 7293 * send back an icmp6 error. 7294 */ 7295 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 7296 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 7297 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 7298 md = m0; 7299 pf_dummynet_route(pd, s, r, ifp, sintosa(&dst), &md); 7300 if (md != NULL) 7301 nd6_output_ifp(ifp, ifp, md, &dst, NULL); 7302 } 7303 else { 7304 in6_ifstat_inc(ifp, ifs6_in_toobig); 7305 if (r_rt != PF_DUPTO) { 7306 if (s && pd->nat_rule != NULL) 7307 PACKET_UNDO_NAT(m0, pd, 7308 ((caddr_t)ip6 - m0->m_data) + 7309 sizeof(struct ip6_hdr), s); 7310 7311 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 7312 } else 7313 goto bad; 7314 } 7315 7316 done: 7317 if (r_rt != PF_DUPTO) 7318 *m = NULL; 7319 return; 7320 7321 bad_locked: 7322 if (s) 7323 PF_STATE_UNLOCK(s); 7324 bad: 7325 m_freem(m0); 7326 goto done; 7327 } 7328 #endif /* INET6 */ 7329 7330 /* 7331 * FreeBSD supports cksum offloads for the following drivers. 7332 * em(4), fxp(4), lge(4), nge(4), re(4), ti(4), txp(4), xl(4) 7333 * 7334 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 7335 * network driver performed cksum including pseudo header, need to verify 7336 * csum_data 7337 * CSUM_DATA_VALID : 7338 * network driver performed cksum, needs to additional pseudo header 7339 * cksum computation with partial csum_data(i.e. lack of H/W support for 7340 * pseudo header, for instance sk(4) and possibly gem(4)) 7341 * 7342 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 7343 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 7344 * TCP/UDP layer. 7345 * Also, set csum_data to 0xffff to force cksum validation. 7346 */ 7347 static int 7348 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 7349 { 7350 u_int16_t sum = 0; 7351 int hw_assist = 0; 7352 struct ip *ip; 7353 7354 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 7355 return (1); 7356 if (m->m_pkthdr.len < off + len) 7357 return (1); 7358 7359 switch (p) { 7360 case IPPROTO_TCP: 7361 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 7362 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 7363 sum = m->m_pkthdr.csum_data; 7364 } else { 7365 ip = mtod(m, struct ip *); 7366 sum = in_pseudo(ip->ip_src.s_addr, 7367 ip->ip_dst.s_addr, htonl((u_short)len + 7368 m->m_pkthdr.csum_data + IPPROTO_TCP)); 7369 } 7370 sum ^= 0xffff; 7371 ++hw_assist; 7372 } 7373 break; 7374 case IPPROTO_UDP: 7375 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 7376 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 7377 sum = m->m_pkthdr.csum_data; 7378 } else { 7379 ip = mtod(m, struct ip *); 7380 sum = in_pseudo(ip->ip_src.s_addr, 7381 ip->ip_dst.s_addr, htonl((u_short)len + 7382 m->m_pkthdr.csum_data + IPPROTO_UDP)); 7383 } 7384 sum ^= 0xffff; 7385 ++hw_assist; 7386 } 7387 break; 7388 case IPPROTO_ICMP: 7389 #ifdef INET6 7390 case IPPROTO_ICMPV6: 7391 #endif /* INET6 */ 7392 break; 7393 default: 7394 return (1); 7395 } 7396 7397 if (!hw_assist) { 7398 switch (af) { 7399 case AF_INET: 7400 if (p == IPPROTO_ICMP) { 7401 if (m->m_len < off) 7402 return (1); 7403 m->m_data += off; 7404 m->m_len -= off; 7405 sum = in_cksum(m, len); 7406 m->m_data -= off; 7407 m->m_len += off; 7408 } else { 7409 if (m->m_len < sizeof(struct ip)) 7410 return (1); 7411 sum = in4_cksum(m, p, off, len); 7412 } 7413 break; 7414 #ifdef INET6 7415 case AF_INET6: 7416 if (m->m_len < sizeof(struct ip6_hdr)) 7417 return (1); 7418 sum = in6_cksum(m, p, off, len); 7419 break; 7420 #endif /* INET6 */ 7421 default: 7422 return (1); 7423 } 7424 } 7425 if (sum) { 7426 switch (p) { 7427 case IPPROTO_TCP: 7428 { 7429 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 7430 break; 7431 } 7432 case IPPROTO_UDP: 7433 { 7434 KMOD_UDPSTAT_INC(udps_badsum); 7435 break; 7436 } 7437 #ifdef INET 7438 case IPPROTO_ICMP: 7439 { 7440 KMOD_ICMPSTAT_INC(icps_checksum); 7441 break; 7442 } 7443 #endif 7444 #ifdef INET6 7445 case IPPROTO_ICMPV6: 7446 { 7447 KMOD_ICMP6STAT_INC(icp6s_checksum); 7448 break; 7449 } 7450 #endif /* INET6 */ 7451 } 7452 return (1); 7453 } else { 7454 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 7455 m->m_pkthdr.csum_flags |= 7456 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 7457 m->m_pkthdr.csum_data = 0xffff; 7458 } 7459 } 7460 return (0); 7461 } 7462 7463 static bool 7464 pf_pdesc_to_dnflow(const struct pf_pdesc *pd, const struct pf_krule *r, 7465 const struct pf_kstate *s, struct ip_fw_args *dnflow) 7466 { 7467 int dndir = r->direction; 7468 7469 if (s && dndir == PF_INOUT) { 7470 dndir = s->direction; 7471 } else if (dndir == PF_INOUT) { 7472 /* Assume primary direction. Happens when we've set dnpipe in 7473 * the ethernet level code. */ 7474 dndir = pd->dir; 7475 } 7476 7477 memset(dnflow, 0, sizeof(*dnflow)); 7478 7479 if (pd->dport != NULL) 7480 dnflow->f_id.dst_port = ntohs(*pd->dport); 7481 if (pd->sport != NULL) 7482 dnflow->f_id.src_port = ntohs(*pd->sport); 7483 7484 if (pd->dir == PF_IN) 7485 dnflow->flags |= IPFW_ARGS_IN; 7486 else 7487 dnflow->flags |= IPFW_ARGS_OUT; 7488 7489 if (pd->dir != dndir && pd->act.dnrpipe) { 7490 dnflow->rule.info = pd->act.dnrpipe; 7491 } 7492 else if (pd->dir == dndir && pd->act.dnpipe) { 7493 dnflow->rule.info = pd->act.dnpipe; 7494 } 7495 else { 7496 return (false); 7497 } 7498 7499 dnflow->rule.info |= IPFW_IS_DUMMYNET; 7500 if (r->free_flags & PFRULE_DN_IS_PIPE || pd->act.flags & PFSTATE_DN_IS_PIPE) 7501 dnflow->rule.info |= IPFW_IS_PIPE; 7502 7503 dnflow->f_id.proto = pd->proto; 7504 dnflow->f_id.extra = dnflow->rule.info; 7505 switch (pd->af) { 7506 case AF_INET: 7507 dnflow->f_id.addr_type = 4; 7508 dnflow->f_id.src_ip = ntohl(pd->src->v4.s_addr); 7509 dnflow->f_id.dst_ip = ntohl(pd->dst->v4.s_addr); 7510 break; 7511 case AF_INET6: 7512 dnflow->flags |= IPFW_ARGS_IP6; 7513 dnflow->f_id.addr_type = 6; 7514 dnflow->f_id.src_ip6 = pd->src->v6; 7515 dnflow->f_id.dst_ip6 = pd->dst->v6; 7516 break; 7517 default: 7518 panic("Invalid AF"); 7519 break; 7520 } 7521 7522 return (true); 7523 } 7524 7525 int 7526 pf_test_eth(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, 7527 struct inpcb *inp) 7528 { 7529 struct pfi_kkif *kif; 7530 struct mbuf *m = *m0; 7531 7532 M_ASSERTPKTHDR(m); 7533 MPASS(ifp->if_vnet == curvnet); 7534 NET_EPOCH_ASSERT(); 7535 7536 if (!V_pf_status.running) 7537 return (PF_PASS); 7538 7539 kif = (struct pfi_kkif *)ifp->if_pf_kif; 7540 7541 if (kif == NULL) { 7542 DPFPRINTF(PF_DEBUG_URGENT, 7543 ("%s: kif == NULL, if_xname %s\n", __func__, ifp->if_xname)); 7544 return (PF_DROP); 7545 } 7546 if (kif->pfik_flags & PFI_IFLAG_SKIP) 7547 return (PF_PASS); 7548 7549 if (m->m_flags & M_SKIP_FIREWALL) 7550 return (PF_PASS); 7551 7552 /* Stateless! */ 7553 return (pf_test_eth_rule(dir, kif, m0)); 7554 } 7555 7556 static int 7557 pf_dummynet(struct pf_pdesc *pd, struct pf_kstate *s, 7558 struct pf_krule *r, struct mbuf **m0) 7559 { 7560 return (pf_dummynet_route(pd, s, r, NULL, NULL, m0)); 7561 } 7562 7563 static int 7564 pf_dummynet_route(struct pf_pdesc *pd, struct pf_kstate *s, 7565 struct pf_krule *r, struct ifnet *ifp, struct sockaddr *sa, 7566 struct mbuf **m0) 7567 { 7568 NET_EPOCH_ASSERT(); 7569 7570 if (pd->act.dnpipe || pd->act.dnrpipe) { 7571 struct ip_fw_args dnflow; 7572 if (ip_dn_io_ptr == NULL) { 7573 m_freem(*m0); 7574 *m0 = NULL; 7575 return (ENOMEM); 7576 } 7577 7578 if (pd->pf_mtag == NULL && 7579 ((pd->pf_mtag = pf_get_mtag(*m0)) == NULL)) { 7580 m_freem(*m0); 7581 *m0 = NULL; 7582 return (ENOMEM); 7583 } 7584 7585 if (ifp != NULL) { 7586 pd->pf_mtag->flags |= PF_MTAG_FLAG_ROUTE_TO; 7587 7588 pd->pf_mtag->if_index = ifp->if_index; 7589 pd->pf_mtag->if_idxgen = ifp->if_idxgen; 7590 7591 MPASS(sa != NULL); 7592 7593 if (pd->af == AF_INET) 7594 memcpy(&pd->pf_mtag->dst, sa, 7595 sizeof(struct sockaddr_in)); 7596 else 7597 memcpy(&pd->pf_mtag->dst, sa, 7598 sizeof(struct sockaddr_in6)); 7599 } 7600 7601 if (pf_pdesc_to_dnflow(pd, r, s, &dnflow)) { 7602 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUMMYNET; 7603 ip_dn_io_ptr(m0, &dnflow); 7604 if (*m0 != NULL) { 7605 pd->pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 7606 pd->pf_mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 7607 } 7608 } 7609 } 7610 7611 return (0); 7612 } 7613 7614 #ifdef INET 7615 int 7616 pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, 7617 struct inpcb *inp, struct pf_rule_actions *default_actions) 7618 { 7619 struct pfi_kkif *kif; 7620 u_short action, reason = 0; 7621 struct mbuf *m = *m0; 7622 struct ip *h = NULL; 7623 struct m_tag *ipfwtag; 7624 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 7625 struct pf_kstate *s = NULL; 7626 struct pf_kruleset *ruleset = NULL; 7627 struct pf_pdesc pd; 7628 int off, dirndx, use_2nd_queue = 0; 7629 uint16_t tag; 7630 uint8_t rt; 7631 7632 PF_RULES_RLOCK_TRACKER; 7633 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); 7634 M_ASSERTPKTHDR(m); 7635 7636 if (!V_pf_status.running) 7637 return (PF_PASS); 7638 7639 PF_RULES_RLOCK(); 7640 7641 kif = (struct pfi_kkif *)ifp->if_pf_kif; 7642 7643 if (__predict_false(kif == NULL)) { 7644 DPFPRINTF(PF_DEBUG_URGENT, 7645 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 7646 PF_RULES_RUNLOCK(); 7647 return (PF_DROP); 7648 } 7649 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 7650 PF_RULES_RUNLOCK(); 7651 return (PF_PASS); 7652 } 7653 7654 if (m->m_flags & M_SKIP_FIREWALL) { 7655 PF_RULES_RUNLOCK(); 7656 return (PF_PASS); 7657 } 7658 7659 memset(&pd, 0, sizeof(pd)); 7660 TAILQ_INIT(&pd.sctp_multihome_jobs); 7661 if (default_actions != NULL) 7662 memcpy(&pd.act, default_actions, sizeof(pd.act)); 7663 pd.pf_mtag = pf_find_mtag(m); 7664 7665 if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_MTAG_FLAG_ROUTE_TO)) { 7666 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 7667 7668 ifp = ifnet_byindexgen(pd.pf_mtag->if_index, 7669 pd.pf_mtag->if_idxgen); 7670 if (ifp == NULL || ifp->if_flags & IFF_DYING) { 7671 PF_RULES_RUNLOCK(); 7672 m_freem(*m0); 7673 *m0 = NULL; 7674 return (PF_PASS); 7675 } 7676 PF_RULES_RUNLOCK(); 7677 (ifp->if_output)(ifp, m, sintosa(&pd.pf_mtag->dst), NULL); 7678 *m0 = NULL; 7679 return (PF_PASS); 7680 } 7681 7682 if (pd.pf_mtag && pd.pf_mtag->dnpipe) { 7683 pd.act.dnpipe = pd.pf_mtag->dnpipe; 7684 pd.act.flags = pd.pf_mtag->dnflags; 7685 } 7686 7687 if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL && 7688 pd.pf_mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 7689 /* Dummynet re-injects packets after they've 7690 * completed their delay. We've already 7691 * processed them, so pass unconditionally. */ 7692 7693 /* But only once. We may see the packet multiple times (e.g. 7694 * PFIL_IN/PFIL_OUT). */ 7695 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 7696 PF_RULES_RUNLOCK(); 7697 7698 return (PF_PASS); 7699 } 7700 7701 pd.sport = pd.dport = NULL; 7702 pd.proto_sum = NULL; 7703 pd.dir = dir; 7704 pd.sidx = (dir == PF_IN) ? 0 : 1; 7705 pd.didx = (dir == PF_IN) ? 1 : 0; 7706 pd.af = AF_INET; 7707 pd.act.rtableid = -1; 7708 7709 if (__predict_false(ip_divert_ptr != NULL) && 7710 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 7711 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 7712 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { 7713 if (pd.pf_mtag == NULL && 7714 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 7715 action = PF_DROP; 7716 goto done; 7717 } 7718 pd.pf_mtag->flags |= PF_MTAG_FLAG_PACKET_LOOPED; 7719 m_tag_delete(m, ipfwtag); 7720 } 7721 if (pd.pf_mtag && pd.pf_mtag->flags & PF_MTAG_FLAG_FASTFWD_OURS_PRESENT) { 7722 m->m_flags |= M_FASTFWD_OURS; 7723 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_FASTFWD_OURS_PRESENT; 7724 } 7725 } else if (pf_normalize_ip(m0, kif, &reason, &pd) != PF_PASS) { 7726 /* We do IP header normalization and packet reassembly here */ 7727 action = PF_DROP; 7728 goto done; 7729 } 7730 m = *m0; /* pf_normalize messes with m0 */ 7731 h = mtod(m, struct ip *); 7732 7733 off = h->ip_hl << 2; 7734 if (off < (int)sizeof(struct ip)) { 7735 action = PF_DROP; 7736 REASON_SET(&reason, PFRES_SHORT); 7737 pd.act.log = PF_LOG_FORCE; 7738 goto done; 7739 } 7740 7741 pd.src = (struct pf_addr *)&h->ip_src; 7742 pd.dst = (struct pf_addr *)&h->ip_dst; 7743 pd.ip_sum = &h->ip_sum; 7744 pd.proto = h->ip_p; 7745 pd.tos = h->ip_tos & ~IPTOS_ECN_MASK; 7746 pd.tot_len = ntohs(h->ip_len); 7747 7748 /* handle fragments that didn't get reassembled by normalization */ 7749 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 7750 action = pf_test_fragment(&r, kif, m, h, &pd, &a, &ruleset); 7751 goto done; 7752 } 7753 7754 switch (h->ip_p) { 7755 case IPPROTO_TCP: { 7756 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), 7757 &action, &reason, AF_INET)) { 7758 if (action != PF_PASS) 7759 pd.act.log = PF_LOG_FORCE; 7760 goto done; 7761 } 7762 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); 7763 7764 pd.sport = &pd.hdr.tcp.th_sport; 7765 pd.dport = &pd.hdr.tcp.th_dport; 7766 7767 /* Respond to SYN with a syncookie. */ 7768 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN && 7769 pd.dir == PF_IN && pf_synflood_check(&pd)) { 7770 pf_syncookie_send(m, off, &pd); 7771 action = PF_DROP; 7772 break; 7773 } 7774 7775 if ((pd.hdr.tcp.th_flags & TH_ACK) && pd.p_len == 0) 7776 use_2nd_queue = 1; 7777 action = pf_normalize_tcp(kif, m, 0, off, h, &pd); 7778 if (action == PF_DROP) 7779 goto done; 7780 action = pf_test_state_tcp(&s, kif, m, off, h, &pd, &reason); 7781 if (action == PF_PASS) { 7782 if (V_pfsync_update_state_ptr != NULL) 7783 V_pfsync_update_state_ptr(s); 7784 r = s->rule.ptr; 7785 a = s->anchor.ptr; 7786 } else if (s == NULL) { 7787 /* Validate remote SYN|ACK, re-create original SYN if 7788 * valid. */ 7789 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == 7790 TH_ACK && pf_syncookie_validate(&pd) && 7791 pd.dir == PF_IN) { 7792 struct mbuf *msyn; 7793 7794 msyn = pf_syncookie_recreate_syn(h->ip_ttl, off, 7795 &pd); 7796 if (msyn == NULL) { 7797 action = PF_DROP; 7798 break; 7799 } 7800 7801 action = pf_test(dir, pflags, ifp, &msyn, inp, 7802 &pd.act); 7803 m_freem(msyn); 7804 if (action != PF_PASS) 7805 break; 7806 7807 action = pf_test_state_tcp(&s, kif, m, off, h, 7808 &pd, &reason); 7809 if (action != PF_PASS || s == NULL) { 7810 action = PF_DROP; 7811 break; 7812 } 7813 7814 s->src.seqhi = ntohl(pd.hdr.tcp.th_ack) - 1; 7815 s->src.seqlo = ntohl(pd.hdr.tcp.th_seq) - 1; 7816 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_DST); 7817 action = pf_synproxy(&pd, &s, &reason); 7818 break; 7819 } else { 7820 action = pf_test_rule(&r, &s, kif, m, off, &pd, 7821 &a, &ruleset, inp); 7822 } 7823 } 7824 break; 7825 } 7826 7827 case IPPROTO_UDP: { 7828 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), 7829 &action, &reason, AF_INET)) { 7830 if (action != PF_PASS) 7831 pd.act.log = PF_LOG_FORCE; 7832 goto done; 7833 } 7834 pd.sport = &pd.hdr.udp.uh_sport; 7835 pd.dport = &pd.hdr.udp.uh_dport; 7836 if (pd.hdr.udp.uh_dport == 0 || 7837 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || 7838 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { 7839 action = PF_DROP; 7840 REASON_SET(&reason, PFRES_SHORT); 7841 goto done; 7842 } 7843 action = pf_test_state_udp(&s, kif, m, off, h, &pd); 7844 if (action == PF_PASS) { 7845 if (V_pfsync_update_state_ptr != NULL) 7846 V_pfsync_update_state_ptr(s); 7847 r = s->rule.ptr; 7848 a = s->anchor.ptr; 7849 } else if (s == NULL) 7850 action = pf_test_rule(&r, &s, kif, m, off, &pd, 7851 &a, &ruleset, inp); 7852 break; 7853 } 7854 7855 case IPPROTO_SCTP: { 7856 if (!pf_pull_hdr(m, off, &pd.hdr.sctp, sizeof(pd.hdr.sctp), 7857 &action, &reason, AF_INET)) { 7858 if (action != PF_PASS) 7859 pd.act.log |= PF_LOG_FORCE; 7860 goto done; 7861 } 7862 pd.p_len = pd.tot_len - off; 7863 7864 pd.sport = &pd.hdr.sctp.src_port; 7865 pd.dport = &pd.hdr.sctp.dest_port; 7866 if (pd.hdr.sctp.src_port == 0 || pd.hdr.sctp.dest_port == 0) { 7867 action = PF_DROP; 7868 REASON_SET(&reason, PFRES_SHORT); 7869 goto done; 7870 } 7871 action = pf_normalize_sctp(dir, kif, m, 0, off, h, &pd); 7872 if (action == PF_DROP) 7873 goto done; 7874 action = pf_test_state_sctp(&s, kif, m, off, h, &pd, 7875 &reason); 7876 if (action == PF_PASS) { 7877 if (V_pfsync_update_state_ptr != NULL) 7878 V_pfsync_update_state_ptr(s); 7879 r = s->rule.ptr; 7880 a = s->anchor.ptr; 7881 } else { 7882 action = pf_test_rule(&r, &s, kif, m, off, 7883 &pd, &a, &ruleset, inp); 7884 } 7885 break; 7886 } 7887 7888 case IPPROTO_ICMP: { 7889 if (!pf_pull_hdr(m, off, &pd.hdr.icmp, ICMP_MINLEN, 7890 &action, &reason, AF_INET)) { 7891 if (action != PF_PASS) 7892 pd.act.log = PF_LOG_FORCE; 7893 goto done; 7894 } 7895 action = pf_test_state_icmp(&s, kif, m, off, h, &pd, &reason); 7896 if (action == PF_PASS) { 7897 if (V_pfsync_update_state_ptr != NULL) 7898 V_pfsync_update_state_ptr(s); 7899 r = s->rule.ptr; 7900 a = s->anchor.ptr; 7901 } else if (s == NULL) 7902 action = pf_test_rule(&r, &s, kif, m, off, &pd, 7903 &a, &ruleset, inp); 7904 break; 7905 } 7906 7907 #ifdef INET6 7908 case IPPROTO_ICMPV6: { 7909 action = PF_DROP; 7910 DPFPRINTF(PF_DEBUG_MISC, 7911 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 7912 goto done; 7913 } 7914 #endif 7915 7916 default: 7917 action = pf_test_state_other(&s, kif, m, &pd); 7918 if (action == PF_PASS) { 7919 if (V_pfsync_update_state_ptr != NULL) 7920 V_pfsync_update_state_ptr(s); 7921 r = s->rule.ptr; 7922 a = s->anchor.ptr; 7923 } else if (s == NULL) 7924 action = pf_test_rule(&r, &s, kif, m, off, &pd, 7925 &a, &ruleset, inp); 7926 break; 7927 } 7928 7929 done: 7930 PF_RULES_RUNLOCK(); 7931 if (action == PF_PASS && h->ip_hl > 5 && 7932 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 7933 action = PF_DROP; 7934 REASON_SET(&reason, PFRES_IPOPTIONS); 7935 pd.act.log = PF_LOG_FORCE; 7936 DPFPRINTF(PF_DEBUG_MISC, 7937 ("pf: dropping packet with ip options\n")); 7938 } 7939 7940 if (s) { 7941 memcpy(&pd.act, &s->act, sizeof(struct pf_rule_actions)); 7942 tag = s->tag; 7943 rt = s->rt; 7944 } else { 7945 tag = r->tag; 7946 rt = r->rt; 7947 } 7948 7949 if (tag > 0 && pf_tag_packet(m, &pd, tag)) { 7950 action = PF_DROP; 7951 REASON_SET(&reason, PFRES_MEMORY); 7952 } 7953 7954 pf_scrub_ip(&m, &pd); 7955 if (pd.proto == IPPROTO_TCP && pd.act.max_mss) 7956 pf_normalize_mss(m, off, &pd); 7957 7958 if (pd.act.rtableid >= 0) 7959 M_SETFIB(m, pd.act.rtableid); 7960 7961 if (pd.act.flags & PFSTATE_SETPRIO) { 7962 if (pd.tos & IPTOS_LOWDELAY) 7963 use_2nd_queue = 1; 7964 if (vlan_set_pcp(m, pd.act.set_prio[use_2nd_queue])) { 7965 action = PF_DROP; 7966 REASON_SET(&reason, PFRES_MEMORY); 7967 pd.act.log = PF_LOG_FORCE; 7968 DPFPRINTF(PF_DEBUG_MISC, 7969 ("pf: failed to allocate 802.1q mtag\n")); 7970 } 7971 } 7972 7973 #ifdef ALTQ 7974 if (action == PF_PASS && pd.act.qid) { 7975 if (pd.pf_mtag == NULL && 7976 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 7977 action = PF_DROP; 7978 REASON_SET(&reason, PFRES_MEMORY); 7979 } else { 7980 if (s != NULL) 7981 pd.pf_mtag->qid_hash = pf_state_hash(s); 7982 if (use_2nd_queue || (pd.tos & IPTOS_LOWDELAY)) 7983 pd.pf_mtag->qid = pd.act.pqid; 7984 else 7985 pd.pf_mtag->qid = pd.act.qid; 7986 /* Add hints for ecn. */ 7987 pd.pf_mtag->hdr = h; 7988 } 7989 } 7990 #endif /* ALTQ */ 7991 7992 /* 7993 * connections redirected to loopback should not match sockets 7994 * bound specifically to loopback due to security implications, 7995 * see tcp_input() and in_pcblookup_listen(). 7996 */ 7997 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7998 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7999 (s->nat_rule.ptr->action == PF_RDR || 8000 s->nat_rule.ptr->action == PF_BINAT) && 8001 IN_LOOPBACK(ntohl(pd.dst->v4.s_addr))) 8002 m->m_flags |= M_SKIP_FIREWALL; 8003 8004 if (__predict_false(ip_divert_ptr != NULL) && action == PF_PASS && 8005 r->divert.port && !PACKET_LOOPED(&pd)) { 8006 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 8007 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 8008 if (ipfwtag != NULL) { 8009 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 8010 ntohs(r->divert.port); 8011 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 8012 8013 if (s) 8014 PF_STATE_UNLOCK(s); 8015 8016 m_tag_prepend(m, ipfwtag); 8017 if (m->m_flags & M_FASTFWD_OURS) { 8018 if (pd.pf_mtag == NULL && 8019 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 8020 action = PF_DROP; 8021 REASON_SET(&reason, PFRES_MEMORY); 8022 pd.act.log = PF_LOG_FORCE; 8023 DPFPRINTF(PF_DEBUG_MISC, 8024 ("pf: failed to allocate tag\n")); 8025 } else { 8026 pd.pf_mtag->flags |= 8027 PF_MTAG_FLAG_FASTFWD_OURS_PRESENT; 8028 m->m_flags &= ~M_FASTFWD_OURS; 8029 } 8030 } 8031 ip_divert_ptr(*m0, dir == PF_IN); 8032 *m0 = NULL; 8033 8034 return (action); 8035 } else { 8036 /* XXX: ipfw has the same behaviour! */ 8037 action = PF_DROP; 8038 REASON_SET(&reason, PFRES_MEMORY); 8039 pd.act.log = PF_LOG_FORCE; 8040 DPFPRINTF(PF_DEBUG_MISC, 8041 ("pf: failed to allocate divert tag\n")); 8042 } 8043 } 8044 8045 if (pd.act.log) { 8046 struct pf_krule *lr; 8047 struct pf_krule_item *ri; 8048 8049 if (s != NULL && s->nat_rule.ptr != NULL && 8050 s->nat_rule.ptr->log & PF_LOG_ALL) 8051 lr = s->nat_rule.ptr; 8052 else 8053 lr = r; 8054 8055 if (pd.act.log & PF_LOG_FORCE || lr->log & PF_LOG_ALL) 8056 PFLOG_PACKET(kif, m, AF_INET, reason, lr, a, ruleset, 8057 &pd, (s == NULL)); 8058 if (s) { 8059 SLIST_FOREACH(ri, &s->match_rules, entry) 8060 if (ri->r->log & PF_LOG_ALL) 8061 PFLOG_PACKET(kif, m, AF_INET, reason, 8062 ri->r, a, ruleset, &pd, 0); 8063 } 8064 } 8065 8066 pf_counter_u64_critical_enter(); 8067 pf_counter_u64_add_protected(&kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS], 8068 pd.tot_len); 8069 pf_counter_u64_add_protected(&kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS], 8070 1); 8071 8072 if (action == PF_PASS || r->action == PF_DROP) { 8073 dirndx = (dir == PF_OUT); 8074 pf_counter_u64_add_protected(&r->packets[dirndx], 1); 8075 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); 8076 pf_update_timestamp(r); 8077 8078 if (a != NULL) { 8079 pf_counter_u64_add_protected(&a->packets[dirndx], 1); 8080 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); 8081 } 8082 if (s != NULL) { 8083 struct pf_krule_item *ri; 8084 8085 if (s->nat_rule.ptr != NULL) { 8086 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 8087 1); 8088 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], 8089 pd.tot_len); 8090 } 8091 if (s->src_node != NULL) { 8092 counter_u64_add(s->src_node->packets[dirndx], 8093 1); 8094 counter_u64_add(s->src_node->bytes[dirndx], 8095 pd.tot_len); 8096 } 8097 if (s->nat_src_node != NULL) { 8098 counter_u64_add(s->nat_src_node->packets[dirndx], 8099 1); 8100 counter_u64_add(s->nat_src_node->bytes[dirndx], 8101 pd.tot_len); 8102 } 8103 dirndx = (dir == s->direction) ? 0 : 1; 8104 s->packets[dirndx]++; 8105 s->bytes[dirndx] += pd.tot_len; 8106 SLIST_FOREACH(ri, &s->match_rules, entry) { 8107 pf_counter_u64_add_protected(&ri->r->packets[dirndx], 1); 8108 pf_counter_u64_add_protected(&ri->r->bytes[dirndx], pd.tot_len); 8109 } 8110 } 8111 tr = r; 8112 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 8113 if (nr != NULL && r == &V_pf_default_rule) 8114 tr = nr; 8115 if (tr->src.addr.type == PF_ADDR_TABLE) 8116 pfr_update_stats(tr->src.addr.p.tbl, 8117 (s == NULL) ? pd.src : 8118 &s->key[(s->direction == PF_IN)]-> 8119 addr[(s->direction == PF_OUT)], 8120 pd.af, pd.tot_len, dir == PF_OUT, 8121 r->action == PF_PASS, tr->src.neg); 8122 if (tr->dst.addr.type == PF_ADDR_TABLE) 8123 pfr_update_stats(tr->dst.addr.p.tbl, 8124 (s == NULL) ? pd.dst : 8125 &s->key[(s->direction == PF_IN)]-> 8126 addr[(s->direction == PF_IN)], 8127 pd.af, pd.tot_len, dir == PF_OUT, 8128 r->action == PF_PASS, tr->dst.neg); 8129 } 8130 pf_counter_u64_critical_exit(); 8131 8132 switch (action) { 8133 case PF_SYNPROXY_DROP: 8134 m_freem(*m0); 8135 case PF_DEFER: 8136 *m0 = NULL; 8137 action = PF_PASS; 8138 break; 8139 case PF_DROP: 8140 m_freem(*m0); 8141 *m0 = NULL; 8142 break; 8143 default: 8144 /* pf_route() returns unlocked. */ 8145 if (rt) { 8146 pf_route(m0, r, kif->pfik_ifp, s, &pd, inp); 8147 goto out; 8148 } 8149 if (pf_dummynet(&pd, s, r, m0) != 0) { 8150 action = PF_DROP; 8151 REASON_SET(&reason, PFRES_MEMORY); 8152 } 8153 break; 8154 } 8155 8156 SDT_PROBE4(pf, ip, test, done, action, reason, r, s); 8157 8158 if (s) 8159 PF_STATE_UNLOCK(s); 8160 8161 out: 8162 pf_sctp_multihome_delayed(&pd, off, kif, s); 8163 8164 return (action); 8165 } 8166 #endif /* INET */ 8167 8168 #ifdef INET6 8169 int 8170 pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp, 8171 struct pf_rule_actions *default_actions) 8172 { 8173 struct pfi_kkif *kif; 8174 u_short action, reason = 0; 8175 struct mbuf *m = *m0, *n = NULL; 8176 struct m_tag *mtag; 8177 struct ip6_hdr *h = NULL; 8178 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 8179 struct pf_kstate *s = NULL; 8180 struct pf_kruleset *ruleset = NULL; 8181 struct pf_pdesc pd; 8182 int off, terminal = 0, dirndx, rh_cnt = 0, use_2nd_queue = 0; 8183 uint16_t tag; 8184 uint8_t rt; 8185 8186 PF_RULES_RLOCK_TRACKER; 8187 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); 8188 M_ASSERTPKTHDR(m); 8189 8190 if (!V_pf_status.running) 8191 return (PF_PASS); 8192 8193 PF_RULES_RLOCK(); 8194 8195 kif = (struct pfi_kkif *)ifp->if_pf_kif; 8196 if (__predict_false(kif == NULL)) { 8197 DPFPRINTF(PF_DEBUG_URGENT, 8198 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 8199 PF_RULES_RUNLOCK(); 8200 return (PF_DROP); 8201 } 8202 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 8203 PF_RULES_RUNLOCK(); 8204 return (PF_PASS); 8205 } 8206 8207 if (m->m_flags & M_SKIP_FIREWALL) { 8208 PF_RULES_RUNLOCK(); 8209 return (PF_PASS); 8210 } 8211 8212 memset(&pd, 0, sizeof(pd)); 8213 TAILQ_INIT(&pd.sctp_multihome_jobs); 8214 if (default_actions != NULL) 8215 memcpy(&pd.act, default_actions, sizeof(pd.act)); 8216 pd.pf_mtag = pf_find_mtag(m); 8217 8218 if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_MTAG_FLAG_ROUTE_TO)) { 8219 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 8220 8221 ifp = ifnet_byindexgen(pd.pf_mtag->if_index, 8222 pd.pf_mtag->if_idxgen); 8223 if (ifp == NULL || ifp->if_flags & IFF_DYING) { 8224 PF_RULES_RUNLOCK(); 8225 m_freem(*m0); 8226 *m0 = NULL; 8227 return (PF_PASS); 8228 } 8229 PF_RULES_RUNLOCK(); 8230 nd6_output_ifp(ifp, ifp, m, 8231 (struct sockaddr_in6 *)&pd.pf_mtag->dst, NULL); 8232 *m0 = NULL; 8233 return (PF_PASS); 8234 } 8235 8236 if (pd.pf_mtag && pd.pf_mtag->dnpipe) { 8237 pd.act.dnpipe = pd.pf_mtag->dnpipe; 8238 pd.act.flags = pd.pf_mtag->dnflags; 8239 } 8240 8241 if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL && 8242 pd.pf_mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 8243 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 8244 /* Dummynet re-injects packets after they've 8245 * completed their delay. We've already 8246 * processed them, so pass unconditionally. */ 8247 PF_RULES_RUNLOCK(); 8248 return (PF_PASS); 8249 } 8250 8251 pd.sport = pd.dport = NULL; 8252 pd.ip_sum = NULL; 8253 pd.proto_sum = NULL; 8254 pd.dir = dir; 8255 pd.sidx = (dir == PF_IN) ? 0 : 1; 8256 pd.didx = (dir == PF_IN) ? 1 : 0; 8257 pd.af = AF_INET6; 8258 pd.act.rtableid = -1; 8259 8260 /* We do IP header normalization and packet reassembly here */ 8261 if (pf_normalize_ip6(m0, kif, &reason, &pd) != PF_PASS) { 8262 action = PF_DROP; 8263 goto done; 8264 } 8265 m = *m0; /* pf_normalize messes with m0 */ 8266 h = mtod(m, struct ip6_hdr *); 8267 8268 /* 8269 * we do not support jumbogram. if we keep going, zero ip6_plen 8270 * will do something bad, so drop the packet for now. 8271 */ 8272 if (htons(h->ip6_plen) == 0) { 8273 action = PF_DROP; 8274 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 8275 goto done; 8276 } 8277 8278 pd.src = (struct pf_addr *)&h->ip6_src; 8279 pd.dst = (struct pf_addr *)&h->ip6_dst; 8280 pd.tos = IPV6_DSCP(h); 8281 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 8282 8283 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 8284 pd.proto = h->ip6_nxt; 8285 do { 8286 switch (pd.proto) { 8287 case IPPROTO_FRAGMENT: 8288 action = pf_test_fragment(&r, kif, m, h, &pd, &a, 8289 &ruleset); 8290 if (action == PF_DROP) 8291 REASON_SET(&reason, PFRES_FRAG); 8292 goto done; 8293 case IPPROTO_ROUTING: { 8294 struct ip6_rthdr rthdr; 8295 8296 if (rh_cnt++) { 8297 DPFPRINTF(PF_DEBUG_MISC, 8298 ("pf: IPv6 more than one rthdr\n")); 8299 action = PF_DROP; 8300 REASON_SET(&reason, PFRES_IPOPTIONS); 8301 pd.act.log = PF_LOG_FORCE; 8302 goto done; 8303 } 8304 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 8305 &reason, pd.af)) { 8306 DPFPRINTF(PF_DEBUG_MISC, 8307 ("pf: IPv6 short rthdr\n")); 8308 action = PF_DROP; 8309 REASON_SET(&reason, PFRES_SHORT); 8310 pd.act.log = PF_LOG_FORCE; 8311 goto done; 8312 } 8313 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 8314 DPFPRINTF(PF_DEBUG_MISC, 8315 ("pf: IPv6 rthdr0\n")); 8316 action = PF_DROP; 8317 REASON_SET(&reason, PFRES_IPOPTIONS); 8318 pd.act.log = PF_LOG_FORCE; 8319 goto done; 8320 } 8321 /* FALLTHROUGH */ 8322 } 8323 case IPPROTO_AH: 8324 case IPPROTO_HOPOPTS: 8325 case IPPROTO_DSTOPTS: { 8326 /* get next header and header length */ 8327 struct ip6_ext opt6; 8328 8329 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 8330 NULL, &reason, pd.af)) { 8331 DPFPRINTF(PF_DEBUG_MISC, 8332 ("pf: IPv6 short opt\n")); 8333 action = PF_DROP; 8334 pd.act.log = PF_LOG_FORCE; 8335 goto done; 8336 } 8337 if (pd.proto == IPPROTO_AH) 8338 off += (opt6.ip6e_len + 2) * 4; 8339 else 8340 off += (opt6.ip6e_len + 1) * 8; 8341 pd.proto = opt6.ip6e_nxt; 8342 /* goto the next header */ 8343 break; 8344 } 8345 default: 8346 terminal++; 8347 break; 8348 } 8349 } while (!terminal); 8350 8351 /* if there's no routing header, use unmodified mbuf for checksumming */ 8352 if (!n) 8353 n = m; 8354 8355 switch (pd.proto) { 8356 case IPPROTO_TCP: { 8357 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), 8358 &action, &reason, AF_INET6)) { 8359 if (action != PF_PASS) 8360 pd.act.log |= PF_LOG_FORCE; 8361 goto done; 8362 } 8363 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); 8364 pd.sport = &pd.hdr.tcp.th_sport; 8365 pd.dport = &pd.hdr.tcp.th_dport; 8366 8367 /* Respond to SYN with a syncookie. */ 8368 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN && 8369 pd.dir == PF_IN && pf_synflood_check(&pd)) { 8370 pf_syncookie_send(m, off, &pd); 8371 action = PF_DROP; 8372 break; 8373 } 8374 8375 action = pf_normalize_tcp(kif, m, 0, off, h, &pd); 8376 if (action == PF_DROP) 8377 goto done; 8378 action = pf_test_state_tcp(&s, kif, m, off, h, &pd, &reason); 8379 if (action == PF_PASS) { 8380 if (V_pfsync_update_state_ptr != NULL) 8381 V_pfsync_update_state_ptr(s); 8382 r = s->rule.ptr; 8383 a = s->anchor.ptr; 8384 } else if (s == NULL) { 8385 /* Validate remote SYN|ACK, re-create original SYN if 8386 * valid. */ 8387 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == 8388 TH_ACK && pf_syncookie_validate(&pd) && 8389 pd.dir == PF_IN) { 8390 struct mbuf *msyn; 8391 8392 msyn = pf_syncookie_recreate_syn(h->ip6_hlim, 8393 off, &pd); 8394 if (msyn == NULL) { 8395 action = PF_DROP; 8396 break; 8397 } 8398 8399 action = pf_test6(dir, pflags, ifp, &msyn, inp, 8400 &pd.act); 8401 m_freem(msyn); 8402 if (action != PF_PASS) 8403 break; 8404 8405 action = pf_test_state_tcp(&s, kif, m, off, h, 8406 &pd, &reason); 8407 if (action != PF_PASS || s == NULL) { 8408 action = PF_DROP; 8409 break; 8410 } 8411 8412 s->src.seqhi = ntohl(pd.hdr.tcp.th_ack) - 1; 8413 s->src.seqlo = ntohl(pd.hdr.tcp.th_seq) - 1; 8414 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_DST); 8415 8416 action = pf_synproxy(&pd, &s, &reason); 8417 break; 8418 } else { 8419 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8420 &a, &ruleset, inp); 8421 } 8422 } 8423 break; 8424 } 8425 8426 case IPPROTO_UDP: { 8427 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), 8428 &action, &reason, AF_INET6)) { 8429 if (action != PF_PASS) 8430 pd.act.log |= PF_LOG_FORCE; 8431 goto done; 8432 } 8433 pd.sport = &pd.hdr.udp.uh_sport; 8434 pd.dport = &pd.hdr.udp.uh_dport; 8435 if (pd.hdr.udp.uh_dport == 0 || 8436 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || 8437 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { 8438 action = PF_DROP; 8439 REASON_SET(&reason, PFRES_SHORT); 8440 goto done; 8441 } 8442 action = pf_test_state_udp(&s, kif, m, off, h, &pd); 8443 if (action == PF_PASS) { 8444 if (V_pfsync_update_state_ptr != NULL) 8445 V_pfsync_update_state_ptr(s); 8446 r = s->rule.ptr; 8447 a = s->anchor.ptr; 8448 } else if (s == NULL) 8449 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8450 &a, &ruleset, inp); 8451 break; 8452 } 8453 8454 case IPPROTO_SCTP: { 8455 if (!pf_pull_hdr(m, off, &pd.hdr.sctp, sizeof(pd.hdr.sctp), 8456 &action, &reason, AF_INET6)) { 8457 if (action != PF_PASS) 8458 pd.act.log |= PF_LOG_FORCE; 8459 goto done; 8460 } 8461 pd.sport = &pd.hdr.sctp.src_port; 8462 pd.dport = &pd.hdr.sctp.dest_port; 8463 if (pd.hdr.sctp.src_port == 0 || pd.hdr.sctp.dest_port == 0) { 8464 action = PF_DROP; 8465 REASON_SET(&reason, PFRES_SHORT); 8466 goto done; 8467 } 8468 action = pf_normalize_sctp(dir, kif, m, 0, off, h, &pd); 8469 if (action == PF_DROP) 8470 goto done; 8471 action = pf_test_state_sctp(&s, kif, m, off, h, &pd, 8472 &reason); 8473 if (action == PF_PASS) { 8474 if (V_pfsync_update_state_ptr != NULL) 8475 V_pfsync_update_state_ptr(s); 8476 r = s->rule.ptr; 8477 a = s->anchor.ptr; 8478 } else { 8479 action = pf_test_rule(&r, &s, kif, m, off, 8480 &pd, &a, &ruleset, inp); 8481 } 8482 break; 8483 } 8484 8485 case IPPROTO_ICMP: { 8486 action = PF_DROP; 8487 DPFPRINTF(PF_DEBUG_MISC, 8488 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 8489 goto done; 8490 } 8491 8492 case IPPROTO_ICMPV6: { 8493 if (!pf_pull_hdr(m, off, &pd.hdr.icmp6, sizeof(pd.hdr.icmp6), 8494 &action, &reason, AF_INET6)) { 8495 if (action != PF_PASS) 8496 pd.act.log |= PF_LOG_FORCE; 8497 goto done; 8498 } 8499 action = pf_test_state_icmp(&s, kif, m, off, h, &pd, &reason); 8500 if (action == PF_PASS) { 8501 if (V_pfsync_update_state_ptr != NULL) 8502 V_pfsync_update_state_ptr(s); 8503 r = s->rule.ptr; 8504 a = s->anchor.ptr; 8505 } else if (s == NULL) 8506 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8507 &a, &ruleset, inp); 8508 break; 8509 } 8510 8511 default: 8512 action = pf_test_state_other(&s, kif, m, &pd); 8513 if (action == PF_PASS) { 8514 if (V_pfsync_update_state_ptr != NULL) 8515 V_pfsync_update_state_ptr(s); 8516 r = s->rule.ptr; 8517 a = s->anchor.ptr; 8518 } else if (s == NULL) 8519 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8520 &a, &ruleset, inp); 8521 break; 8522 } 8523 8524 done: 8525 PF_RULES_RUNLOCK(); 8526 if (n != m) { 8527 m_freem(n); 8528 n = NULL; 8529 } 8530 8531 /* handle dangerous IPv6 extension headers. */ 8532 if (action == PF_PASS && rh_cnt && 8533 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 8534 action = PF_DROP; 8535 REASON_SET(&reason, PFRES_IPOPTIONS); 8536 pd.act.log = r->log; 8537 DPFPRINTF(PF_DEBUG_MISC, 8538 ("pf: dropping packet with dangerous v6 headers\n")); 8539 } 8540 8541 if (s) { 8542 memcpy(&pd.act, &s->act, sizeof(struct pf_rule_actions)); 8543 tag = s->tag; 8544 rt = s->rt; 8545 } else { 8546 tag = r->tag; 8547 rt = r->rt; 8548 } 8549 8550 if (tag > 0 && pf_tag_packet(m, &pd, tag)) { 8551 action = PF_DROP; 8552 REASON_SET(&reason, PFRES_MEMORY); 8553 } 8554 8555 pf_scrub_ip6(&m, &pd); 8556 if (pd.proto == IPPROTO_TCP && pd.act.max_mss) 8557 pf_normalize_mss(m, off, &pd); 8558 8559 if (pd.act.rtableid >= 0) 8560 M_SETFIB(m, pd.act.rtableid); 8561 8562 if (pd.act.flags & PFSTATE_SETPRIO) { 8563 if (pd.tos & IPTOS_LOWDELAY) 8564 use_2nd_queue = 1; 8565 if (vlan_set_pcp(m, pd.act.set_prio[use_2nd_queue])) { 8566 action = PF_DROP; 8567 REASON_SET(&reason, PFRES_MEMORY); 8568 pd.act.log = PF_LOG_FORCE; 8569 DPFPRINTF(PF_DEBUG_MISC, 8570 ("pf: failed to allocate 802.1q mtag\n")); 8571 } 8572 } 8573 8574 #ifdef ALTQ 8575 if (action == PF_PASS && pd.act.qid) { 8576 if (pd.pf_mtag == NULL && 8577 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 8578 action = PF_DROP; 8579 REASON_SET(&reason, PFRES_MEMORY); 8580 } else { 8581 if (s != NULL) 8582 pd.pf_mtag->qid_hash = pf_state_hash(s); 8583 if (pd.tos & IPTOS_LOWDELAY) 8584 pd.pf_mtag->qid = pd.act.pqid; 8585 else 8586 pd.pf_mtag->qid = pd.act.qid; 8587 /* Add hints for ecn. */ 8588 pd.pf_mtag->hdr = h; 8589 } 8590 } 8591 #endif /* ALTQ */ 8592 8593 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 8594 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 8595 (s->nat_rule.ptr->action == PF_RDR || 8596 s->nat_rule.ptr->action == PF_BINAT) && 8597 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 8598 m->m_flags |= M_SKIP_FIREWALL; 8599 8600 /* XXX: Anybody working on it?! */ 8601 if (r->divert.port) 8602 printf("pf: divert(9) is not supported for IPv6\n"); 8603 8604 if (pd.act.log) { 8605 struct pf_krule *lr; 8606 struct pf_krule_item *ri; 8607 8608 if (s != NULL && s->nat_rule.ptr != NULL && 8609 s->nat_rule.ptr->log & PF_LOG_ALL) 8610 lr = s->nat_rule.ptr; 8611 else 8612 lr = r; 8613 8614 if (pd.act.log & PF_LOG_FORCE || lr->log & PF_LOG_ALL) 8615 PFLOG_PACKET(kif, m, AF_INET6, reason, lr, a, ruleset, 8616 &pd, (s == NULL)); 8617 if (s) { 8618 SLIST_FOREACH(ri, &s->match_rules, entry) 8619 if (ri->r->log & PF_LOG_ALL) 8620 PFLOG_PACKET(kif, m, AF_INET6, reason, 8621 ri->r, a, ruleset, &pd, 0); 8622 } 8623 } 8624 8625 pf_counter_u64_critical_enter(); 8626 pf_counter_u64_add_protected(&kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS], 8627 pd.tot_len); 8628 pf_counter_u64_add_protected(&kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS], 8629 1); 8630 8631 if (action == PF_PASS || r->action == PF_DROP) { 8632 dirndx = (dir == PF_OUT); 8633 pf_counter_u64_add_protected(&r->packets[dirndx], 1); 8634 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); 8635 if (a != NULL) { 8636 pf_counter_u64_add_protected(&a->packets[dirndx], 1); 8637 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); 8638 } 8639 if (s != NULL) { 8640 if (s->nat_rule.ptr != NULL) { 8641 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 8642 1); 8643 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], 8644 pd.tot_len); 8645 } 8646 if (s->src_node != NULL) { 8647 counter_u64_add(s->src_node->packets[dirndx], 8648 1); 8649 counter_u64_add(s->src_node->bytes[dirndx], 8650 pd.tot_len); 8651 } 8652 if (s->nat_src_node != NULL) { 8653 counter_u64_add(s->nat_src_node->packets[dirndx], 8654 1); 8655 counter_u64_add(s->nat_src_node->bytes[dirndx], 8656 pd.tot_len); 8657 } 8658 dirndx = (dir == s->direction) ? 0 : 1; 8659 s->packets[dirndx]++; 8660 s->bytes[dirndx] += pd.tot_len; 8661 } 8662 tr = r; 8663 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 8664 if (nr != NULL && r == &V_pf_default_rule) 8665 tr = nr; 8666 if (tr->src.addr.type == PF_ADDR_TABLE) 8667 pfr_update_stats(tr->src.addr.p.tbl, 8668 (s == NULL) ? pd.src : 8669 &s->key[(s->direction == PF_IN)]->addr[0], 8670 pd.af, pd.tot_len, dir == PF_OUT, 8671 r->action == PF_PASS, tr->src.neg); 8672 if (tr->dst.addr.type == PF_ADDR_TABLE) 8673 pfr_update_stats(tr->dst.addr.p.tbl, 8674 (s == NULL) ? pd.dst : 8675 &s->key[(s->direction == PF_IN)]->addr[1], 8676 pd.af, pd.tot_len, dir == PF_OUT, 8677 r->action == PF_PASS, tr->dst.neg); 8678 } 8679 pf_counter_u64_critical_exit(); 8680 8681 switch (action) { 8682 case PF_SYNPROXY_DROP: 8683 m_freem(*m0); 8684 case PF_DEFER: 8685 *m0 = NULL; 8686 action = PF_PASS; 8687 break; 8688 case PF_DROP: 8689 m_freem(*m0); 8690 *m0 = NULL; 8691 break; 8692 default: 8693 /* pf_route6() returns unlocked. */ 8694 if (rt) { 8695 pf_route6(m0, r, kif->pfik_ifp, s, &pd, inp); 8696 goto out; 8697 } 8698 if (pf_dummynet(&pd, s, r, m0) != 0) { 8699 action = PF_DROP; 8700 REASON_SET(&reason, PFRES_MEMORY); 8701 } 8702 break; 8703 } 8704 8705 if (s) 8706 PF_STATE_UNLOCK(s); 8707 8708 /* If reassembled packet passed, create new fragments. */ 8709 if (action == PF_PASS && *m0 && dir == PF_OUT && 8710 (mtag = m_tag_find(m, PACKET_TAG_PF_REASSEMBLED, NULL)) != NULL) 8711 action = pf_refragment6(ifp, m0, mtag, pflags & PFIL_FWD); 8712 8713 out: 8714 SDT_PROBE4(pf, ip, test6, done, action, reason, r, s); 8715 8716 pf_sctp_multihome_delayed(&pd, off, kif, s); 8717 8718 return (action); 8719 } 8720 #endif /* INET6 */ 8721