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 SDT_PROBE_DEFINE2(pf, purge, state, rowcount, "int", "size_t"); 141 142 /* 143 * Global variables 144 */ 145 146 /* state tables */ 147 VNET_DEFINE(struct pf_altqqueue, pf_altqs[4]); 148 VNET_DEFINE(struct pf_kpalist, pf_pabuf); 149 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); 150 VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_active); 151 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); 152 VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_inactive); 153 VNET_DEFINE(struct pf_kstatus, pf_status); 154 155 VNET_DEFINE(u_int32_t, ticket_altqs_active); 156 VNET_DEFINE(u_int32_t, ticket_altqs_inactive); 157 VNET_DEFINE(int, altqs_inactive_open); 158 VNET_DEFINE(u_int32_t, ticket_pabuf); 159 160 VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); 161 #define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) 162 VNET_DEFINE(u_char, pf_tcp_secret[16]); 163 #define V_pf_tcp_secret VNET(pf_tcp_secret) 164 VNET_DEFINE(int, pf_tcp_secret_init); 165 #define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) 166 VNET_DEFINE(int, pf_tcp_iss_off); 167 #define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) 168 VNET_DECLARE(int, pf_vnet_active); 169 #define V_pf_vnet_active VNET(pf_vnet_active) 170 171 VNET_DEFINE_STATIC(uint32_t, pf_purge_idx); 172 #define V_pf_purge_idx VNET(pf_purge_idx) 173 174 #ifdef PF_WANT_32_TO_64_COUNTER 175 VNET_DEFINE_STATIC(uint32_t, pf_counter_periodic_iter); 176 #define V_pf_counter_periodic_iter VNET(pf_counter_periodic_iter) 177 178 VNET_DEFINE(struct allrulelist_head, pf_allrulelist); 179 VNET_DEFINE(size_t, pf_allrulecount); 180 VNET_DEFINE(struct pf_krule *, pf_rulemarker); 181 #endif 182 183 struct pf_sctp_endpoint; 184 RB_HEAD(pf_sctp_endpoints, pf_sctp_endpoint); 185 struct pf_sctp_source { 186 sa_family_t af; 187 struct pf_addr addr; 188 TAILQ_ENTRY(pf_sctp_source) entry; 189 }; 190 TAILQ_HEAD(pf_sctp_sources, pf_sctp_source); 191 struct pf_sctp_endpoint 192 { 193 uint32_t v_tag; 194 struct pf_sctp_sources sources; 195 RB_ENTRY(pf_sctp_endpoint) entry; 196 }; 197 static int 198 pf_sctp_endpoint_compare(struct pf_sctp_endpoint *a, struct pf_sctp_endpoint *b) 199 { 200 return (a->v_tag - b->v_tag); 201 } 202 RB_PROTOTYPE(pf_sctp_endpoints, pf_sctp_endpoint, entry, pf_sctp_endpoint_compare); 203 RB_GENERATE(pf_sctp_endpoints, pf_sctp_endpoint, entry, pf_sctp_endpoint_compare); 204 VNET_DEFINE_STATIC(struct pf_sctp_endpoints, pf_sctp_endpoints); 205 #define V_pf_sctp_endpoints VNET(pf_sctp_endpoints) 206 static struct mtx_padalign pf_sctp_endpoints_mtx; 207 MTX_SYSINIT(pf_sctp_endpoints_mtx, &pf_sctp_endpoints_mtx, "SCTP endpoints", MTX_DEF); 208 #define PF_SCTP_ENDPOINTS_LOCK() mtx_lock(&pf_sctp_endpoints_mtx) 209 #define PF_SCTP_ENDPOINTS_UNLOCK() mtx_unlock(&pf_sctp_endpoints_mtx) 210 211 /* 212 * Queue for pf_intr() sends. 213 */ 214 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations"); 215 struct pf_send_entry { 216 STAILQ_ENTRY(pf_send_entry) pfse_next; 217 struct mbuf *pfse_m; 218 enum { 219 PFSE_IP, 220 PFSE_IP6, 221 PFSE_ICMP, 222 PFSE_ICMP6, 223 } pfse_type; 224 struct { 225 int type; 226 int code; 227 int mtu; 228 } icmpopts; 229 }; 230 231 STAILQ_HEAD(pf_send_head, pf_send_entry); 232 VNET_DEFINE_STATIC(struct pf_send_head, pf_sendqueue); 233 #define V_pf_sendqueue VNET(pf_sendqueue) 234 235 static struct mtx_padalign pf_sendqueue_mtx; 236 MTX_SYSINIT(pf_sendqueue_mtx, &pf_sendqueue_mtx, "pf send queue", MTX_DEF); 237 #define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx) 238 #define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx) 239 240 /* 241 * Queue for pf_overload_task() tasks. 242 */ 243 struct pf_overload_entry { 244 SLIST_ENTRY(pf_overload_entry) next; 245 struct pf_addr addr; 246 sa_family_t af; 247 uint8_t dir; 248 struct pf_krule *rule; 249 }; 250 251 SLIST_HEAD(pf_overload_head, pf_overload_entry); 252 VNET_DEFINE_STATIC(struct pf_overload_head, pf_overloadqueue); 253 #define V_pf_overloadqueue VNET(pf_overloadqueue) 254 VNET_DEFINE_STATIC(struct task, pf_overloadtask); 255 #define V_pf_overloadtask VNET(pf_overloadtask) 256 257 static struct mtx_padalign pf_overloadqueue_mtx; 258 MTX_SYSINIT(pf_overloadqueue_mtx, &pf_overloadqueue_mtx, 259 "pf overload/flush queue", MTX_DEF); 260 #define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx) 261 #define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx) 262 263 VNET_DEFINE(struct pf_krulequeue, pf_unlinked_rules); 264 struct mtx_padalign pf_unlnkdrules_mtx; 265 MTX_SYSINIT(pf_unlnkdrules_mtx, &pf_unlnkdrules_mtx, "pf unlinked rules", 266 MTX_DEF); 267 268 struct sx pf_config_lock; 269 SX_SYSINIT(pf_config_lock, &pf_config_lock, "pf config"); 270 271 struct mtx_padalign pf_table_stats_lock; 272 MTX_SYSINIT(pf_table_stats_lock, &pf_table_stats_lock, "pf table stats", 273 MTX_DEF); 274 275 VNET_DEFINE_STATIC(uma_zone_t, pf_sources_z); 276 #define V_pf_sources_z VNET(pf_sources_z) 277 uma_zone_t pf_mtag_z; 278 VNET_DEFINE(uma_zone_t, pf_state_z); 279 VNET_DEFINE(uma_zone_t, pf_state_key_z); 280 281 VNET_DEFINE(struct unrhdr64, pf_stateid); 282 283 static void pf_src_tree_remove_state(struct pf_kstate *); 284 static void pf_init_threshold(struct pf_threshold *, u_int32_t, 285 u_int32_t); 286 static void pf_add_threshold(struct pf_threshold *); 287 static int pf_check_threshold(struct pf_threshold *); 288 289 static void pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *, 290 u_int16_t *, u_int16_t *, struct pf_addr *, 291 u_int16_t, u_int8_t, sa_family_t); 292 static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 293 struct tcphdr *, struct pf_state_peer *); 294 static void pf_change_icmp(struct pf_addr *, u_int16_t *, 295 struct pf_addr *, struct pf_addr *, u_int16_t, 296 u_int16_t *, u_int16_t *, u_int16_t *, 297 u_int16_t *, u_int8_t, sa_family_t); 298 static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 299 sa_family_t, struct pf_krule *, int); 300 static void pf_detach_state(struct pf_kstate *); 301 static int pf_state_key_attach(struct pf_state_key *, 302 struct pf_state_key *, struct pf_kstate *); 303 static void pf_state_key_detach(struct pf_kstate *, int); 304 static int pf_state_key_ctor(void *, int, void *, int); 305 static u_int32_t pf_tcp_iss(struct pf_pdesc *); 306 static __inline void pf_dummynet_flag_remove(struct mbuf *m, 307 struct pf_mtag *pf_mtag); 308 static int pf_dummynet(struct pf_pdesc *, struct pf_kstate *, 309 struct pf_krule *, struct mbuf **); 310 static int pf_dummynet_route(struct pf_pdesc *, 311 struct pf_kstate *, struct pf_krule *, 312 struct ifnet *, struct sockaddr *, struct mbuf **); 313 static int pf_test_eth_rule(int, struct pfi_kkif *, 314 struct mbuf **); 315 static int pf_test_rule(struct pf_krule **, struct pf_kstate **, 316 struct pfi_kkif *, struct mbuf *, int, 317 struct pf_pdesc *, struct pf_krule **, 318 struct pf_kruleset **, struct inpcb *); 319 static int pf_create_state(struct pf_krule *, struct pf_krule *, 320 struct pf_krule *, struct pf_pdesc *, 321 struct pf_ksrc_node *, struct pf_state_key *, 322 struct pf_state_key *, struct mbuf *, int, 323 u_int16_t, u_int16_t, int *, struct pfi_kkif *, 324 struct pf_kstate **, int, u_int16_t, u_int16_t, 325 int, struct pf_krule_slist *); 326 static int pf_test_fragment(struct pf_krule **, struct pfi_kkif *, 327 struct mbuf *, void *, struct pf_pdesc *, 328 struct pf_krule **, struct pf_kruleset **); 329 static int pf_tcp_track_full(struct pf_kstate **, 330 struct pfi_kkif *, struct mbuf *, int, 331 struct pf_pdesc *, u_short *, int *); 332 static int pf_tcp_track_sloppy(struct pf_kstate **, 333 struct pf_pdesc *, u_short *); 334 static int pf_test_state_tcp(struct pf_kstate **, 335 struct pfi_kkif *, struct mbuf *, int, 336 void *, struct pf_pdesc *, u_short *); 337 static int pf_test_state_udp(struct pf_kstate **, 338 struct pfi_kkif *, struct mbuf *, int, 339 void *, struct pf_pdesc *); 340 static int pf_test_state_icmp(struct pf_kstate **, 341 struct pfi_kkif *, struct mbuf *, int, 342 void *, struct pf_pdesc *, u_short *); 343 static void pf_sctp_multihome_detach_addr(const struct pf_kstate *); 344 static void pf_sctp_multihome_delayed(struct pf_pdesc *, int, 345 struct pfi_kkif *, struct pf_kstate *, int); 346 static int pf_test_state_sctp(struct pf_kstate **, 347 struct pfi_kkif *, struct mbuf *, int, 348 void *, struct pf_pdesc *, u_short *); 349 static int pf_test_state_other(struct pf_kstate **, 350 struct pfi_kkif *, struct mbuf *, struct pf_pdesc *); 351 static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 352 int, u_int16_t); 353 static int pf_check_proto_cksum(struct mbuf *, int, int, 354 u_int8_t, sa_family_t); 355 static void pf_print_state_parts(struct pf_kstate *, 356 struct pf_state_key *, struct pf_state_key *); 357 static void pf_patch_8(struct mbuf *, u_int16_t *, u_int8_t *, u_int8_t, 358 bool, u_int8_t); 359 static struct pf_kstate *pf_find_state(struct pfi_kkif *, 360 struct pf_state_key_cmp *, u_int); 361 static int pf_src_connlimit(struct pf_kstate **); 362 static void pf_overload_task(void *v, int pending); 363 static u_short pf_insert_src_node(struct pf_ksrc_node **, 364 struct pf_krule *, struct pf_addr *, sa_family_t); 365 static u_int pf_purge_expired_states(u_int, int); 366 static void pf_purge_unlinked_rules(void); 367 static int pf_mtag_uminit(void *, int, int); 368 static void pf_mtag_free(struct m_tag *); 369 static void pf_packet_rework_nat(struct mbuf *, struct pf_pdesc *, 370 int, struct pf_state_key *); 371 #ifdef INET 372 static void pf_route(struct mbuf **, struct pf_krule *, 373 struct ifnet *, struct pf_kstate *, 374 struct pf_pdesc *, struct inpcb *); 375 #endif /* INET */ 376 #ifdef INET6 377 static void pf_change_a6(struct pf_addr *, u_int16_t *, 378 struct pf_addr *, u_int8_t); 379 static void pf_route6(struct mbuf **, struct pf_krule *, 380 struct ifnet *, struct pf_kstate *, 381 struct pf_pdesc *, struct inpcb *); 382 #endif /* INET6 */ 383 static __inline void pf_set_protostate(struct pf_kstate *, int, u_int8_t); 384 385 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 386 387 extern int pf_end_threads; 388 extern struct proc *pf_purge_proc; 389 390 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); 391 392 #define PACKET_UNDO_NAT(_m, _pd, _off, _s) \ 393 do { \ 394 struct pf_state_key *nk; \ 395 if ((pd->dir) == PF_OUT) \ 396 nk = (_s)->key[PF_SK_STACK]; \ 397 else \ 398 nk = (_s)->key[PF_SK_WIRE]; \ 399 pf_packet_rework_nat(_m, _pd, _off, nk); \ 400 } while (0) 401 402 #define PACKET_LOOPED(pd) ((pd)->pf_mtag && \ 403 (pd)->pf_mtag->flags & PF_MTAG_FLAG_PACKET_LOOPED) 404 405 #define STATE_LOOKUP(i, k, s, pd) \ 406 do { \ 407 (s) = pf_find_state((i), (k), (pd->dir)); \ 408 SDT_PROBE5(pf, ip, state, lookup, i, k, (pd->dir), pd, (s)); \ 409 if ((s) == NULL) \ 410 return (PF_DROP); \ 411 if (PACKET_LOOPED(pd)) \ 412 return (PF_PASS); \ 413 } while (0) 414 415 static struct pfi_kkif * 416 BOUND_IFACE(struct pf_krule *r, struct pfi_kkif *k, struct pf_pdesc *pd) 417 { 418 /* Floating unless otherwise specified. */ 419 if (! (r->rule_flag & PFRULE_IFBOUND)) 420 return (V_pfi_all); 421 422 /* Don't overrule the interface for states created on incoming packets. */ 423 if (pd->dir == PF_IN) 424 return (k); 425 426 /* No route-to, so don't overrrule. */ 427 if (r->rt != PF_ROUTETO) 428 return (k); 429 430 if (r->rpool.cur == NULL) 431 return (k); 432 433 /* Bind to the route-to interface. */ 434 return (r->rpool.cur->kif); 435 } 436 437 #define STATE_INC_COUNTERS(s) \ 438 do { \ 439 struct pf_krule_item *mrm; \ 440 counter_u64_add(s->rule.ptr->states_cur, 1); \ 441 counter_u64_add(s->rule.ptr->states_tot, 1); \ 442 if (s->anchor.ptr != NULL) { \ 443 counter_u64_add(s->anchor.ptr->states_cur, 1); \ 444 counter_u64_add(s->anchor.ptr->states_tot, 1); \ 445 } \ 446 if (s->nat_rule.ptr != NULL) { \ 447 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\ 448 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\ 449 } \ 450 SLIST_FOREACH(mrm, &s->match_rules, entry) { \ 451 counter_u64_add(mrm->r->states_cur, 1); \ 452 counter_u64_add(mrm->r->states_tot, 1); \ 453 } \ 454 } while (0) 455 456 #define STATE_DEC_COUNTERS(s) \ 457 do { \ 458 struct pf_krule_item *mrm; \ 459 if (s->nat_rule.ptr != NULL) \ 460 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\ 461 if (s->anchor.ptr != NULL) \ 462 counter_u64_add(s->anchor.ptr->states_cur, -1); \ 463 counter_u64_add(s->rule.ptr->states_cur, -1); \ 464 SLIST_FOREACH(mrm, &s->match_rules, entry) \ 465 counter_u64_add(mrm->r->states_cur, -1); \ 466 } while (0) 467 468 MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures"); 469 MALLOC_DEFINE(M_PF_RULE_ITEM, "pf_krule_item", "pf(4) rule items"); 470 VNET_DEFINE(struct pf_keyhash *, pf_keyhash); 471 VNET_DEFINE(struct pf_idhash *, pf_idhash); 472 VNET_DEFINE(struct pf_srchash *, pf_srchash); 473 474 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 475 "pf(4)"); 476 477 u_long pf_hashmask; 478 u_long pf_srchashmask; 479 static u_long pf_hashsize; 480 static u_long pf_srchashsize; 481 u_long pf_ioctl_maxcount = 65535; 482 483 SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN, 484 &pf_hashsize, 0, "Size of pf(4) states hashtable"); 485 SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN, 486 &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable"); 487 SYSCTL_ULONG(_net_pf, OID_AUTO, request_maxcount, CTLFLAG_RWTUN, 488 &pf_ioctl_maxcount, 0, "Maximum number of tables, addresses, ... in a single ioctl() call"); 489 490 VNET_DEFINE(void *, pf_swi_cookie); 491 VNET_DEFINE(struct intr_event *, pf_swi_ie); 492 493 VNET_DEFINE(uint32_t, pf_hashseed); 494 #define V_pf_hashseed VNET(pf_hashseed) 495 496 static void 497 pf_sctp_checksum(struct mbuf *m, int off) 498 { 499 uint32_t sum = 0; 500 501 /* Zero out the checksum, to enable recalculation. */ 502 m_copyback(m, off + offsetof(struct sctphdr, checksum), 503 sizeof(sum), (caddr_t)&sum); 504 505 sum = sctp_calculate_cksum(m, off); 506 507 m_copyback(m, off + offsetof(struct sctphdr, checksum), 508 sizeof(sum), (caddr_t)&sum); 509 } 510 511 int 512 pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af) 513 { 514 515 switch (af) { 516 #ifdef INET 517 case AF_INET: 518 if (a->addr32[0] > b->addr32[0]) 519 return (1); 520 if (a->addr32[0] < b->addr32[0]) 521 return (-1); 522 break; 523 #endif /* INET */ 524 #ifdef INET6 525 case AF_INET6: 526 if (a->addr32[3] > b->addr32[3]) 527 return (1); 528 if (a->addr32[3] < b->addr32[3]) 529 return (-1); 530 if (a->addr32[2] > b->addr32[2]) 531 return (1); 532 if (a->addr32[2] < b->addr32[2]) 533 return (-1); 534 if (a->addr32[1] > b->addr32[1]) 535 return (1); 536 if (a->addr32[1] < b->addr32[1]) 537 return (-1); 538 if (a->addr32[0] > b->addr32[0]) 539 return (1); 540 if (a->addr32[0] < b->addr32[0]) 541 return (-1); 542 break; 543 #endif /* INET6 */ 544 default: 545 panic("%s: unknown address family %u", __func__, af); 546 } 547 return (0); 548 } 549 550 static void 551 pf_packet_rework_nat(struct mbuf *m, struct pf_pdesc *pd, int off, 552 struct pf_state_key *nk) 553 { 554 555 switch (pd->proto) { 556 case IPPROTO_TCP: { 557 struct tcphdr *th = &pd->hdr.tcp; 558 559 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) 560 pf_change_ap(m, pd->src, &th->th_sport, pd->ip_sum, 561 &th->th_sum, &nk->addr[pd->sidx], 562 nk->port[pd->sidx], 0, pd->af); 563 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) 564 pf_change_ap(m, pd->dst, &th->th_dport, pd->ip_sum, 565 &th->th_sum, &nk->addr[pd->didx], 566 nk->port[pd->didx], 0, pd->af); 567 m_copyback(m, off, sizeof(*th), (caddr_t)th); 568 break; 569 } 570 case IPPROTO_UDP: { 571 struct udphdr *uh = &pd->hdr.udp; 572 573 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) 574 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 575 &uh->uh_sum, &nk->addr[pd->sidx], 576 nk->port[pd->sidx], 1, pd->af); 577 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) 578 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 579 &uh->uh_sum, &nk->addr[pd->didx], 580 nk->port[pd->didx], 1, pd->af); 581 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 582 break; 583 } 584 case IPPROTO_SCTP: { 585 struct sctphdr *sh = &pd->hdr.sctp; 586 uint16_t checksum = 0; 587 588 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) { 589 pf_change_ap(m, pd->src, &sh->src_port, pd->ip_sum, 590 &checksum, &nk->addr[pd->sidx], 591 nk->port[pd->sidx], 1, pd->af); 592 } 593 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) { 594 pf_change_ap(m, pd->dst, &sh->dest_port, pd->ip_sum, 595 &checksum, &nk->addr[pd->didx], 596 nk->port[pd->didx], 1, pd->af); 597 } 598 599 break; 600 } 601 case IPPROTO_ICMP: { 602 struct icmp *ih = &pd->hdr.icmp; 603 604 if (nk->port[pd->sidx] != ih->icmp_id) { 605 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( 606 ih->icmp_cksum, ih->icmp_id, 607 nk->port[pd->sidx], 0); 608 ih->icmp_id = nk->port[pd->sidx]; 609 pd->sport = &ih->icmp_id; 610 611 m_copyback(m, off, ICMP_MINLEN, (caddr_t)ih); 612 } 613 /* FALLTHROUGH */ 614 } 615 default: 616 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) { 617 switch (pd->af) { 618 case AF_INET: 619 pf_change_a(&pd->src->v4.s_addr, 620 pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 621 0); 622 break; 623 case AF_INET6: 624 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 625 break; 626 } 627 } 628 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) { 629 switch (pd->af) { 630 case AF_INET: 631 pf_change_a(&pd->dst->v4.s_addr, 632 pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 633 0); 634 break; 635 case AF_INET6: 636 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 637 break; 638 } 639 } 640 break; 641 } 642 } 643 644 static __inline uint32_t 645 pf_hashkey(struct pf_state_key *sk) 646 { 647 uint32_t h; 648 649 h = murmur3_32_hash32((uint32_t *)sk, 650 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t), 651 V_pf_hashseed); 652 653 return (h & pf_hashmask); 654 } 655 656 static __inline uint32_t 657 pf_hashsrc(struct pf_addr *addr, sa_family_t af) 658 { 659 uint32_t h; 660 661 switch (af) { 662 case AF_INET: 663 h = murmur3_32_hash32((uint32_t *)&addr->v4, 664 sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed); 665 break; 666 case AF_INET6: 667 h = murmur3_32_hash32((uint32_t *)&addr->v6, 668 sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed); 669 break; 670 default: 671 panic("%s: unknown address family %u", __func__, af); 672 } 673 674 return (h & pf_srchashmask); 675 } 676 677 #ifdef ALTQ 678 static int 679 pf_state_hash(struct pf_kstate *s) 680 { 681 u_int32_t hv = (intptr_t)s / sizeof(*s); 682 683 hv ^= crc32(&s->src, sizeof(s->src)); 684 hv ^= crc32(&s->dst, sizeof(s->dst)); 685 if (hv == 0) 686 hv = 1; 687 return (hv); 688 } 689 #endif 690 691 static __inline void 692 pf_set_protostate(struct pf_kstate *s, int which, u_int8_t newstate) 693 { 694 if (which == PF_PEER_DST || which == PF_PEER_BOTH) 695 s->dst.state = newstate; 696 if (which == PF_PEER_DST) 697 return; 698 if (s->src.state == newstate) 699 return; 700 if (s->creatorid == V_pf_status.hostid && 701 s->key[PF_SK_STACK] != NULL && 702 s->key[PF_SK_STACK]->proto == IPPROTO_TCP && 703 !(TCPS_HAVEESTABLISHED(s->src.state) || 704 s->src.state == TCPS_CLOSED) && 705 (TCPS_HAVEESTABLISHED(newstate) || newstate == TCPS_CLOSED)) 706 atomic_add_32(&V_pf_status.states_halfopen, -1); 707 708 s->src.state = newstate; 709 } 710 711 #ifdef INET6 712 void 713 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 714 { 715 switch (af) { 716 #ifdef INET 717 case AF_INET: 718 dst->addr32[0] = src->addr32[0]; 719 break; 720 #endif /* INET */ 721 case AF_INET6: 722 dst->addr32[0] = src->addr32[0]; 723 dst->addr32[1] = src->addr32[1]; 724 dst->addr32[2] = src->addr32[2]; 725 dst->addr32[3] = src->addr32[3]; 726 break; 727 } 728 } 729 #endif /* INET6 */ 730 731 static void 732 pf_init_threshold(struct pf_threshold *threshold, 733 u_int32_t limit, u_int32_t seconds) 734 { 735 threshold->limit = limit * PF_THRESHOLD_MULT; 736 threshold->seconds = seconds; 737 threshold->count = 0; 738 threshold->last = time_uptime; 739 } 740 741 static void 742 pf_add_threshold(struct pf_threshold *threshold) 743 { 744 u_int32_t t = time_uptime, diff = t - threshold->last; 745 746 if (diff >= threshold->seconds) 747 threshold->count = 0; 748 else 749 threshold->count -= threshold->count * diff / 750 threshold->seconds; 751 threshold->count += PF_THRESHOLD_MULT; 752 threshold->last = t; 753 } 754 755 static int 756 pf_check_threshold(struct pf_threshold *threshold) 757 { 758 return (threshold->count > threshold->limit); 759 } 760 761 static int 762 pf_src_connlimit(struct pf_kstate **state) 763 { 764 struct pf_overload_entry *pfoe; 765 int bad = 0; 766 767 PF_STATE_LOCK_ASSERT(*state); 768 /* 769 * XXXKS: The src node is accessed unlocked! 770 * PF_SRC_NODE_LOCK_ASSERT((*state)->src_node); 771 */ 772 773 (*state)->src_node->conn++; 774 (*state)->src.tcp_est = 1; 775 pf_add_threshold(&(*state)->src_node->conn_rate); 776 777 if ((*state)->rule.ptr->max_src_conn && 778 (*state)->rule.ptr->max_src_conn < 779 (*state)->src_node->conn) { 780 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1); 781 bad++; 782 } 783 784 if ((*state)->rule.ptr->max_src_conn_rate.limit && 785 pf_check_threshold(&(*state)->src_node->conn_rate)) { 786 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1); 787 bad++; 788 } 789 790 if (!bad) 791 return (0); 792 793 /* Kill this state. */ 794 (*state)->timeout = PFTM_PURGE; 795 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED); 796 797 if ((*state)->rule.ptr->overload_tbl == NULL) 798 return (1); 799 800 /* Schedule overloading and flushing task. */ 801 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT); 802 if (pfoe == NULL) 803 return (1); /* too bad :( */ 804 805 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr)); 806 pfoe->af = (*state)->key[PF_SK_WIRE]->af; 807 pfoe->rule = (*state)->rule.ptr; 808 pfoe->dir = (*state)->direction; 809 PF_OVERLOADQ_LOCK(); 810 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next); 811 PF_OVERLOADQ_UNLOCK(); 812 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask); 813 814 return (1); 815 } 816 817 static void 818 pf_overload_task(void *v, int pending) 819 { 820 struct pf_overload_head queue; 821 struct pfr_addr p; 822 struct pf_overload_entry *pfoe, *pfoe1; 823 uint32_t killed = 0; 824 825 CURVNET_SET((struct vnet *)v); 826 827 PF_OVERLOADQ_LOCK(); 828 queue = V_pf_overloadqueue; 829 SLIST_INIT(&V_pf_overloadqueue); 830 PF_OVERLOADQ_UNLOCK(); 831 832 bzero(&p, sizeof(p)); 833 SLIST_FOREACH(pfoe, &queue, next) { 834 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1); 835 if (V_pf_status.debug >= PF_DEBUG_MISC) { 836 printf("%s: blocking address ", __func__); 837 pf_print_host(&pfoe->addr, 0, pfoe->af); 838 printf("\n"); 839 } 840 841 p.pfra_af = pfoe->af; 842 switch (pfoe->af) { 843 #ifdef INET 844 case AF_INET: 845 p.pfra_net = 32; 846 p.pfra_ip4addr = pfoe->addr.v4; 847 break; 848 #endif 849 #ifdef INET6 850 case AF_INET6: 851 p.pfra_net = 128; 852 p.pfra_ip6addr = pfoe->addr.v6; 853 break; 854 #endif 855 } 856 857 PF_RULES_WLOCK(); 858 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second); 859 PF_RULES_WUNLOCK(); 860 } 861 862 /* 863 * Remove those entries, that don't need flushing. 864 */ 865 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 866 if (pfoe->rule->flush == 0) { 867 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next); 868 free(pfoe, M_PFTEMP); 869 } else 870 counter_u64_add( 871 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1); 872 873 /* If nothing to flush, return. */ 874 if (SLIST_EMPTY(&queue)) { 875 CURVNET_RESTORE(); 876 return; 877 } 878 879 for (int i = 0; i <= pf_hashmask; i++) { 880 struct pf_idhash *ih = &V_pf_idhash[i]; 881 struct pf_state_key *sk; 882 struct pf_kstate *s; 883 884 PF_HASHROW_LOCK(ih); 885 LIST_FOREACH(s, &ih->states, entry) { 886 sk = s->key[PF_SK_WIRE]; 887 SLIST_FOREACH(pfoe, &queue, next) 888 if (sk->af == pfoe->af && 889 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) || 890 pfoe->rule == s->rule.ptr) && 891 ((pfoe->dir == PF_OUT && 892 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) || 893 (pfoe->dir == PF_IN && 894 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) { 895 s->timeout = PFTM_PURGE; 896 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED); 897 killed++; 898 } 899 } 900 PF_HASHROW_UNLOCK(ih); 901 } 902 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1) 903 free(pfoe, M_PFTEMP); 904 if (V_pf_status.debug >= PF_DEBUG_MISC) 905 printf("%s: %u states killed", __func__, killed); 906 907 CURVNET_RESTORE(); 908 } 909 910 /* 911 * Can return locked on failure, so that we can consistently 912 * allocate and insert a new one. 913 */ 914 struct pf_ksrc_node * 915 pf_find_src_node(struct pf_addr *src, struct pf_krule *rule, sa_family_t af, 916 struct pf_srchash **sh, bool returnlocked) 917 { 918 struct pf_ksrc_node *n; 919 920 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1); 921 922 *sh = &V_pf_srchash[pf_hashsrc(src, af)]; 923 PF_HASHROW_LOCK(*sh); 924 LIST_FOREACH(n, &(*sh)->nodes, entry) 925 if (n->rule.ptr == rule && n->af == af && 926 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) || 927 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0))) 928 break; 929 930 if (n != NULL) { 931 n->states++; 932 PF_HASHROW_UNLOCK(*sh); 933 } else if (returnlocked == false) 934 PF_HASHROW_UNLOCK(*sh); 935 936 return (n); 937 } 938 939 static void 940 pf_free_src_node(struct pf_ksrc_node *sn) 941 { 942 943 for (int i = 0; i < 2; i++) { 944 counter_u64_free(sn->bytes[i]); 945 counter_u64_free(sn->packets[i]); 946 } 947 uma_zfree(V_pf_sources_z, sn); 948 } 949 950 static u_short 951 pf_insert_src_node(struct pf_ksrc_node **sn, struct pf_krule *rule, 952 struct pf_addr *src, sa_family_t af) 953 { 954 u_short reason = 0; 955 struct pf_srchash *sh = NULL; 956 957 KASSERT((rule->rule_flag & PFRULE_SRCTRACK || 958 rule->rpool.opts & PF_POOL_STICKYADDR), 959 ("%s for non-tracking rule %p", __func__, rule)); 960 961 if (*sn == NULL) 962 *sn = pf_find_src_node(src, rule, af, &sh, true); 963 964 if (*sn == NULL) { 965 PF_HASHROW_ASSERT(sh); 966 967 if (rule->max_src_nodes && 968 counter_u64_fetch(rule->src_nodes) >= rule->max_src_nodes) { 969 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 1); 970 PF_HASHROW_UNLOCK(sh); 971 reason = PFRES_SRCLIMIT; 972 goto done; 973 } 974 975 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO); 976 if ((*sn) == NULL) { 977 PF_HASHROW_UNLOCK(sh); 978 reason = PFRES_MEMORY; 979 goto done; 980 } 981 982 for (int i = 0; i < 2; i++) { 983 (*sn)->bytes[i] = counter_u64_alloc(M_NOWAIT); 984 (*sn)->packets[i] = counter_u64_alloc(M_NOWAIT); 985 986 if ((*sn)->bytes[i] == NULL || (*sn)->packets[i] == NULL) { 987 pf_free_src_node(*sn); 988 PF_HASHROW_UNLOCK(sh); 989 reason = PFRES_MEMORY; 990 goto done; 991 } 992 } 993 994 pf_init_threshold(&(*sn)->conn_rate, 995 rule->max_src_conn_rate.limit, 996 rule->max_src_conn_rate.seconds); 997 998 MPASS((*sn)->lock == NULL); 999 (*sn)->lock = &sh->lock; 1000 1001 (*sn)->af = af; 1002 (*sn)->rule.ptr = rule; 1003 PF_ACPY(&(*sn)->addr, src, af); 1004 LIST_INSERT_HEAD(&sh->nodes, *sn, entry); 1005 (*sn)->creation = time_uptime; 1006 (*sn)->ruletype = rule->action; 1007 (*sn)->states = 1; 1008 if ((*sn)->rule.ptr != NULL) 1009 counter_u64_add((*sn)->rule.ptr->src_nodes, 1); 1010 PF_HASHROW_UNLOCK(sh); 1011 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1); 1012 } else { 1013 if (rule->max_src_states && 1014 (*sn)->states >= rule->max_src_states) { 1015 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES], 1016 1); 1017 reason = PFRES_SRCLIMIT; 1018 goto done; 1019 } 1020 } 1021 done: 1022 return (reason); 1023 } 1024 1025 void 1026 pf_unlink_src_node(struct pf_ksrc_node *src) 1027 { 1028 PF_SRC_NODE_LOCK_ASSERT(src); 1029 1030 LIST_REMOVE(src, entry); 1031 if (src->rule.ptr) 1032 counter_u64_add(src->rule.ptr->src_nodes, -1); 1033 } 1034 1035 u_int 1036 pf_free_src_nodes(struct pf_ksrc_node_list *head) 1037 { 1038 struct pf_ksrc_node *sn, *tmp; 1039 u_int count = 0; 1040 1041 LIST_FOREACH_SAFE(sn, head, entry, tmp) { 1042 pf_free_src_node(sn); 1043 count++; 1044 } 1045 1046 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count); 1047 1048 return (count); 1049 } 1050 1051 void 1052 pf_mtag_initialize(void) 1053 { 1054 1055 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) + 1056 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL, 1057 UMA_ALIGN_PTR, 0); 1058 } 1059 1060 /* Per-vnet data storage structures initialization. */ 1061 void 1062 pf_initialize(void) 1063 { 1064 struct pf_keyhash *kh; 1065 struct pf_idhash *ih; 1066 struct pf_srchash *sh; 1067 u_int i; 1068 1069 if (pf_hashsize == 0 || !powerof2(pf_hashsize)) 1070 pf_hashsize = PF_HASHSIZ; 1071 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize)) 1072 pf_srchashsize = PF_SRCHASHSIZ; 1073 1074 V_pf_hashseed = arc4random(); 1075 1076 /* States and state keys storage. */ 1077 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_kstate), 1078 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 1079 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z; 1080 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT); 1081 uma_zone_set_warning(V_pf_state_z, "PF states limit reached"); 1082 1083 V_pf_state_key_z = uma_zcreate("pf state keys", 1084 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL, 1085 UMA_ALIGN_PTR, 0); 1086 1087 V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash), 1088 M_PFHASH, M_NOWAIT | M_ZERO); 1089 V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash), 1090 M_PFHASH, M_NOWAIT | M_ZERO); 1091 if (V_pf_keyhash == NULL || V_pf_idhash == NULL) { 1092 printf("pf: Unable to allocate memory for " 1093 "state_hashsize %lu.\n", pf_hashsize); 1094 1095 free(V_pf_keyhash, M_PFHASH); 1096 free(V_pf_idhash, M_PFHASH); 1097 1098 pf_hashsize = PF_HASHSIZ; 1099 V_pf_keyhash = mallocarray(pf_hashsize, 1100 sizeof(struct pf_keyhash), M_PFHASH, M_WAITOK | M_ZERO); 1101 V_pf_idhash = mallocarray(pf_hashsize, 1102 sizeof(struct pf_idhash), M_PFHASH, M_WAITOK | M_ZERO); 1103 } 1104 1105 pf_hashmask = pf_hashsize - 1; 1106 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 1107 i++, kh++, ih++) { 1108 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK); 1109 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF); 1110 } 1111 1112 /* Source nodes. */ 1113 V_pf_sources_z = uma_zcreate("pf source nodes", 1114 sizeof(struct pf_ksrc_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 1115 0); 1116 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z; 1117 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT); 1118 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached"); 1119 1120 V_pf_srchash = mallocarray(pf_srchashsize, 1121 sizeof(struct pf_srchash), M_PFHASH, M_NOWAIT | M_ZERO); 1122 if (V_pf_srchash == NULL) { 1123 printf("pf: Unable to allocate memory for " 1124 "source_hashsize %lu.\n", pf_srchashsize); 1125 1126 pf_srchashsize = PF_SRCHASHSIZ; 1127 V_pf_srchash = mallocarray(pf_srchashsize, 1128 sizeof(struct pf_srchash), M_PFHASH, M_WAITOK | M_ZERO); 1129 } 1130 1131 pf_srchashmask = pf_srchashsize - 1; 1132 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) 1133 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF); 1134 1135 /* ALTQ */ 1136 TAILQ_INIT(&V_pf_altqs[0]); 1137 TAILQ_INIT(&V_pf_altqs[1]); 1138 TAILQ_INIT(&V_pf_altqs[2]); 1139 TAILQ_INIT(&V_pf_altqs[3]); 1140 TAILQ_INIT(&V_pf_pabuf); 1141 V_pf_altqs_active = &V_pf_altqs[0]; 1142 V_pf_altq_ifs_active = &V_pf_altqs[1]; 1143 V_pf_altqs_inactive = &V_pf_altqs[2]; 1144 V_pf_altq_ifs_inactive = &V_pf_altqs[3]; 1145 1146 /* Send & overload+flush queues. */ 1147 STAILQ_INIT(&V_pf_sendqueue); 1148 SLIST_INIT(&V_pf_overloadqueue); 1149 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet); 1150 1151 /* Unlinked, but may be referenced rules. */ 1152 TAILQ_INIT(&V_pf_unlinked_rules); 1153 } 1154 1155 void 1156 pf_mtag_cleanup(void) 1157 { 1158 1159 uma_zdestroy(pf_mtag_z); 1160 } 1161 1162 void 1163 pf_cleanup(void) 1164 { 1165 struct pf_keyhash *kh; 1166 struct pf_idhash *ih; 1167 struct pf_srchash *sh; 1168 struct pf_send_entry *pfse, *next; 1169 u_int i; 1170 1171 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask; 1172 i++, kh++, ih++) { 1173 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty", 1174 __func__)); 1175 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty", 1176 __func__)); 1177 mtx_destroy(&kh->lock); 1178 mtx_destroy(&ih->lock); 1179 } 1180 free(V_pf_keyhash, M_PFHASH); 1181 free(V_pf_idhash, M_PFHASH); 1182 1183 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1184 KASSERT(LIST_EMPTY(&sh->nodes), 1185 ("%s: source node hash not empty", __func__)); 1186 mtx_destroy(&sh->lock); 1187 } 1188 free(V_pf_srchash, M_PFHASH); 1189 1190 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) { 1191 m_freem(pfse->pfse_m); 1192 free(pfse, M_PFTEMP); 1193 } 1194 MPASS(RB_EMPTY(&V_pf_sctp_endpoints)); 1195 1196 uma_zdestroy(V_pf_sources_z); 1197 uma_zdestroy(V_pf_state_z); 1198 uma_zdestroy(V_pf_state_key_z); 1199 } 1200 1201 static int 1202 pf_mtag_uminit(void *mem, int size, int how) 1203 { 1204 struct m_tag *t; 1205 1206 t = (struct m_tag *)mem; 1207 t->m_tag_cookie = MTAG_ABI_COMPAT; 1208 t->m_tag_id = PACKET_TAG_PF; 1209 t->m_tag_len = sizeof(struct pf_mtag); 1210 t->m_tag_free = pf_mtag_free; 1211 1212 return (0); 1213 } 1214 1215 static void 1216 pf_mtag_free(struct m_tag *t) 1217 { 1218 1219 uma_zfree(pf_mtag_z, t); 1220 } 1221 1222 struct pf_mtag * 1223 pf_get_mtag(struct mbuf *m) 1224 { 1225 struct m_tag *mtag; 1226 1227 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL) 1228 return ((struct pf_mtag *)(mtag + 1)); 1229 1230 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT); 1231 if (mtag == NULL) 1232 return (NULL); 1233 bzero(mtag + 1, sizeof(struct pf_mtag)); 1234 m_tag_prepend(m, mtag); 1235 1236 return ((struct pf_mtag *)(mtag + 1)); 1237 } 1238 1239 static int 1240 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks, 1241 struct pf_kstate *s) 1242 { 1243 struct pf_keyhash *khs, *khw, *kh; 1244 struct pf_state_key *sk, *cur; 1245 struct pf_kstate *si, *olds = NULL; 1246 int idx; 1247 1248 NET_EPOCH_ASSERT(); 1249 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1250 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__)); 1251 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__)); 1252 1253 /* 1254 * We need to lock hash slots of both keys. To avoid deadlock 1255 * we always lock the slot with lower address first. Unlock order 1256 * isn't important. 1257 * 1258 * We also need to lock ID hash slot before dropping key 1259 * locks. On success we return with ID hash slot locked. 1260 */ 1261 1262 if (skw == sks) { 1263 khs = khw = &V_pf_keyhash[pf_hashkey(skw)]; 1264 PF_HASHROW_LOCK(khs); 1265 } else { 1266 khs = &V_pf_keyhash[pf_hashkey(sks)]; 1267 khw = &V_pf_keyhash[pf_hashkey(skw)]; 1268 if (khs == khw) { 1269 PF_HASHROW_LOCK(khs); 1270 } else if (khs < khw) { 1271 PF_HASHROW_LOCK(khs); 1272 PF_HASHROW_LOCK(khw); 1273 } else { 1274 PF_HASHROW_LOCK(khw); 1275 PF_HASHROW_LOCK(khs); 1276 } 1277 } 1278 1279 #define KEYS_UNLOCK() do { \ 1280 if (khs != khw) { \ 1281 PF_HASHROW_UNLOCK(khs); \ 1282 PF_HASHROW_UNLOCK(khw); \ 1283 } else \ 1284 PF_HASHROW_UNLOCK(khs); \ 1285 } while (0) 1286 1287 /* 1288 * First run: start with wire key. 1289 */ 1290 sk = skw; 1291 kh = khw; 1292 idx = PF_SK_WIRE; 1293 1294 MPASS(s->lock == NULL); 1295 s->lock = &V_pf_idhash[PF_IDHASH(s)].lock; 1296 1297 keyattach: 1298 LIST_FOREACH(cur, &kh->keys, entry) 1299 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0) 1300 break; 1301 1302 if (cur != NULL) { 1303 /* Key exists. Check for same kif, if none, add to key. */ 1304 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) { 1305 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)]; 1306 1307 PF_HASHROW_LOCK(ih); 1308 if (si->kif == s->kif && 1309 si->direction == s->direction) { 1310 if (sk->proto == IPPROTO_TCP && 1311 si->src.state >= TCPS_FIN_WAIT_2 && 1312 si->dst.state >= TCPS_FIN_WAIT_2) { 1313 /* 1314 * New state matches an old >FIN_WAIT_2 1315 * state. We can't drop key hash locks, 1316 * thus we can't unlink it properly. 1317 * 1318 * As a workaround we drop it into 1319 * TCPS_CLOSED state, schedule purge 1320 * ASAP and push it into the very end 1321 * of the slot TAILQ, so that it won't 1322 * conflict with our new state. 1323 */ 1324 pf_set_protostate(si, PF_PEER_BOTH, 1325 TCPS_CLOSED); 1326 si->timeout = PFTM_PURGE; 1327 olds = si; 1328 } else { 1329 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1330 printf("pf: %s key attach " 1331 "failed on %s: ", 1332 (idx == PF_SK_WIRE) ? 1333 "wire" : "stack", 1334 s->kif->pfik_name); 1335 pf_print_state_parts(s, 1336 (idx == PF_SK_WIRE) ? 1337 sk : NULL, 1338 (idx == PF_SK_STACK) ? 1339 sk : NULL); 1340 printf(", existing: "); 1341 pf_print_state_parts(si, 1342 (idx == PF_SK_WIRE) ? 1343 sk : NULL, 1344 (idx == PF_SK_STACK) ? 1345 sk : NULL); 1346 printf("\n"); 1347 } 1348 PF_HASHROW_UNLOCK(ih); 1349 KEYS_UNLOCK(); 1350 uma_zfree(V_pf_state_key_z, sk); 1351 if (idx == PF_SK_STACK) 1352 pf_detach_state(s); 1353 return (EEXIST); /* collision! */ 1354 } 1355 } 1356 PF_HASHROW_UNLOCK(ih); 1357 } 1358 uma_zfree(V_pf_state_key_z, sk); 1359 s->key[idx] = cur; 1360 } else { 1361 LIST_INSERT_HEAD(&kh->keys, sk, entry); 1362 s->key[idx] = sk; 1363 } 1364 1365 stateattach: 1366 /* List is sorted, if-bound states before floating. */ 1367 if (s->kif == V_pfi_all) 1368 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]); 1369 else 1370 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]); 1371 1372 if (olds) { 1373 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]); 1374 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds, 1375 key_list[idx]); 1376 olds = NULL; 1377 } 1378 1379 /* 1380 * Attach done. See how should we (or should not?) 1381 * attach a second key. 1382 */ 1383 if (sks == skw) { 1384 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; 1385 idx = PF_SK_STACK; 1386 sks = NULL; 1387 goto stateattach; 1388 } else if (sks != NULL) { 1389 /* 1390 * Continue attaching with stack key. 1391 */ 1392 sk = sks; 1393 kh = khs; 1394 idx = PF_SK_STACK; 1395 sks = NULL; 1396 goto keyattach; 1397 } 1398 1399 PF_STATE_LOCK(s); 1400 KEYS_UNLOCK(); 1401 1402 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL, 1403 ("%s failure", __func__)); 1404 1405 return (0); 1406 #undef KEYS_UNLOCK 1407 } 1408 1409 static void 1410 pf_detach_state(struct pf_kstate *s) 1411 { 1412 struct pf_state_key *sks = s->key[PF_SK_STACK]; 1413 struct pf_keyhash *kh; 1414 1415 NET_EPOCH_ASSERT(); 1416 1417 pf_sctp_multihome_detach_addr(s); 1418 1419 if ((s->state_flags & PFSTATE_PFLOW) && V_pflow_export_state_ptr) 1420 V_pflow_export_state_ptr(s); 1421 1422 if (sks != NULL) { 1423 kh = &V_pf_keyhash[pf_hashkey(sks)]; 1424 PF_HASHROW_LOCK(kh); 1425 if (s->key[PF_SK_STACK] != NULL) 1426 pf_state_key_detach(s, PF_SK_STACK); 1427 /* 1428 * If both point to same key, then we are done. 1429 */ 1430 if (sks == s->key[PF_SK_WIRE]) { 1431 pf_state_key_detach(s, PF_SK_WIRE); 1432 PF_HASHROW_UNLOCK(kh); 1433 return; 1434 } 1435 PF_HASHROW_UNLOCK(kh); 1436 } 1437 1438 if (s->key[PF_SK_WIRE] != NULL) { 1439 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])]; 1440 PF_HASHROW_LOCK(kh); 1441 if (s->key[PF_SK_WIRE] != NULL) 1442 pf_state_key_detach(s, PF_SK_WIRE); 1443 PF_HASHROW_UNLOCK(kh); 1444 } 1445 } 1446 1447 static void 1448 pf_state_key_detach(struct pf_kstate *s, int idx) 1449 { 1450 struct pf_state_key *sk = s->key[idx]; 1451 #ifdef INVARIANTS 1452 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)]; 1453 1454 PF_HASHROW_ASSERT(kh); 1455 #endif 1456 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]); 1457 s->key[idx] = NULL; 1458 1459 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) { 1460 LIST_REMOVE(sk, entry); 1461 uma_zfree(V_pf_state_key_z, sk); 1462 } 1463 } 1464 1465 static int 1466 pf_state_key_ctor(void *mem, int size, void *arg, int flags) 1467 { 1468 struct pf_state_key *sk = mem; 1469 1470 bzero(sk, sizeof(struct pf_state_key_cmp)); 1471 TAILQ_INIT(&sk->states[PF_SK_WIRE]); 1472 TAILQ_INIT(&sk->states[PF_SK_STACK]); 1473 1474 return (0); 1475 } 1476 1477 struct pf_state_key * 1478 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr, 1479 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) 1480 { 1481 struct pf_state_key *sk; 1482 1483 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1484 if (sk == NULL) 1485 return (NULL); 1486 1487 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af); 1488 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af); 1489 sk->port[pd->sidx] = sport; 1490 sk->port[pd->didx] = dport; 1491 sk->proto = pd->proto; 1492 sk->af = pd->af; 1493 1494 return (sk); 1495 } 1496 1497 struct pf_state_key * 1498 pf_state_key_clone(struct pf_state_key *orig) 1499 { 1500 struct pf_state_key *sk; 1501 1502 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT); 1503 if (sk == NULL) 1504 return (NULL); 1505 1506 bcopy(orig, sk, sizeof(struct pf_state_key_cmp)); 1507 1508 return (sk); 1509 } 1510 1511 int 1512 pf_state_insert(struct pfi_kkif *kif, struct pfi_kkif *orig_kif, 1513 struct pf_state_key *skw, struct pf_state_key *sks, struct pf_kstate *s) 1514 { 1515 struct pf_idhash *ih; 1516 struct pf_kstate *cur; 1517 int error; 1518 1519 NET_EPOCH_ASSERT(); 1520 1521 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]), 1522 ("%s: sks not pristine", __func__)); 1523 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]), 1524 ("%s: skw not pristine", __func__)); 1525 KASSERT(s->refs == 0, ("%s: state not pristine", __func__)); 1526 1527 s->kif = kif; 1528 s->orig_kif = orig_kif; 1529 1530 if (s->id == 0 && s->creatorid == 0) { 1531 s->id = alloc_unr64(&V_pf_stateid); 1532 s->id = htobe64(s->id); 1533 s->creatorid = V_pf_status.hostid; 1534 } 1535 1536 /* Returns with ID locked on success. */ 1537 if ((error = pf_state_key_attach(skw, sks, s)) != 0) 1538 return (error); 1539 1540 ih = &V_pf_idhash[PF_IDHASH(s)]; 1541 PF_HASHROW_ASSERT(ih); 1542 LIST_FOREACH(cur, &ih->states, entry) 1543 if (cur->id == s->id && cur->creatorid == s->creatorid) 1544 break; 1545 1546 if (cur != NULL) { 1547 PF_HASHROW_UNLOCK(ih); 1548 if (V_pf_status.debug >= PF_DEBUG_MISC) { 1549 printf("pf: state ID collision: " 1550 "id: %016llx creatorid: %08x\n", 1551 (unsigned long long)be64toh(s->id), 1552 ntohl(s->creatorid)); 1553 } 1554 pf_detach_state(s); 1555 return (EEXIST); 1556 } 1557 LIST_INSERT_HEAD(&ih->states, s, entry); 1558 /* One for keys, one for ID hash. */ 1559 refcount_init(&s->refs, 2); 1560 1561 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_INSERT], 1); 1562 if (V_pfsync_insert_state_ptr != NULL) 1563 V_pfsync_insert_state_ptr(s); 1564 1565 /* Returns locked. */ 1566 return (0); 1567 } 1568 1569 /* 1570 * Find state by ID: returns with locked row on success. 1571 */ 1572 struct pf_kstate * 1573 pf_find_state_byid(uint64_t id, uint32_t creatorid) 1574 { 1575 struct pf_idhash *ih; 1576 struct pf_kstate *s; 1577 1578 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1579 1580 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))]; 1581 1582 PF_HASHROW_LOCK(ih); 1583 LIST_FOREACH(s, &ih->states, entry) 1584 if (s->id == id && s->creatorid == creatorid) 1585 break; 1586 1587 if (s == NULL) 1588 PF_HASHROW_UNLOCK(ih); 1589 1590 return (s); 1591 } 1592 1593 /* 1594 * Find state by key. 1595 * Returns with ID hash slot locked on success. 1596 */ 1597 static struct pf_kstate * 1598 pf_find_state(struct pfi_kkif *kif, struct pf_state_key_cmp *key, u_int dir) 1599 { 1600 struct pf_keyhash *kh; 1601 struct pf_state_key *sk; 1602 struct pf_kstate *s; 1603 int idx; 1604 1605 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1606 1607 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1608 1609 PF_HASHROW_LOCK(kh); 1610 LIST_FOREACH(sk, &kh->keys, entry) 1611 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1612 break; 1613 if (sk == NULL) { 1614 PF_HASHROW_UNLOCK(kh); 1615 return (NULL); 1616 } 1617 1618 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK); 1619 1620 /* List is sorted, if-bound states before floating ones. */ 1621 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) 1622 if (s->kif == V_pfi_all || s->kif == kif || s->orig_kif == kif) { 1623 PF_STATE_LOCK(s); 1624 PF_HASHROW_UNLOCK(kh); 1625 if (__predict_false(s->timeout >= PFTM_MAX)) { 1626 /* 1627 * State is either being processed by 1628 * pf_unlink_state() in an other thread, or 1629 * is scheduled for immediate expiry. 1630 */ 1631 PF_STATE_UNLOCK(s); 1632 return (NULL); 1633 } 1634 return (s); 1635 } 1636 PF_HASHROW_UNLOCK(kh); 1637 1638 return (NULL); 1639 } 1640 1641 /* 1642 * Returns with ID hash slot locked on success. 1643 */ 1644 struct pf_kstate * 1645 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) 1646 { 1647 struct pf_keyhash *kh; 1648 struct pf_state_key *sk; 1649 struct pf_kstate *s, *ret = NULL; 1650 int idx, inout = 0; 1651 1652 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1); 1653 1654 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)]; 1655 1656 PF_HASHROW_LOCK(kh); 1657 LIST_FOREACH(sk, &kh->keys, entry) 1658 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0) 1659 break; 1660 if (sk == NULL) { 1661 PF_HASHROW_UNLOCK(kh); 1662 return (NULL); 1663 } 1664 switch (dir) { 1665 case PF_IN: 1666 idx = PF_SK_WIRE; 1667 break; 1668 case PF_OUT: 1669 idx = PF_SK_STACK; 1670 break; 1671 case PF_INOUT: 1672 idx = PF_SK_WIRE; 1673 inout = 1; 1674 break; 1675 default: 1676 panic("%s: dir %u", __func__, dir); 1677 } 1678 second_run: 1679 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) { 1680 if (more == NULL) { 1681 PF_STATE_LOCK(s); 1682 PF_HASHROW_UNLOCK(kh); 1683 return (s); 1684 } 1685 1686 if (ret) 1687 (*more)++; 1688 else { 1689 ret = s; 1690 PF_STATE_LOCK(s); 1691 } 1692 } 1693 if (inout == 1) { 1694 inout = 0; 1695 idx = PF_SK_STACK; 1696 goto second_run; 1697 } 1698 PF_HASHROW_UNLOCK(kh); 1699 1700 return (ret); 1701 } 1702 1703 /* 1704 * FIXME 1705 * This routine is inefficient -- locks the state only to unlock immediately on 1706 * return. 1707 * It is racy -- after the state is unlocked nothing stops other threads from 1708 * removing it. 1709 */ 1710 bool 1711 pf_find_state_all_exists(struct pf_state_key_cmp *key, u_int dir) 1712 { 1713 struct pf_kstate *s; 1714 1715 s = pf_find_state_all(key, dir, NULL); 1716 if (s != NULL) { 1717 PF_STATE_UNLOCK(s); 1718 return (true); 1719 } 1720 return (false); 1721 } 1722 1723 /* END state table stuff */ 1724 1725 static void 1726 pf_send(struct pf_send_entry *pfse) 1727 { 1728 1729 PF_SENDQ_LOCK(); 1730 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next); 1731 PF_SENDQ_UNLOCK(); 1732 swi_sched(V_pf_swi_cookie, 0); 1733 } 1734 1735 static bool 1736 pf_isforlocal(struct mbuf *m, int af) 1737 { 1738 switch (af) { 1739 #ifdef INET 1740 case AF_INET: { 1741 struct ip *ip = mtod(m, struct ip *); 1742 1743 return (in_localip(ip->ip_dst)); 1744 } 1745 #endif 1746 #ifdef INET6 1747 case AF_INET6: { 1748 struct ip6_hdr *ip6; 1749 struct in6_ifaddr *ia; 1750 ip6 = mtod(m, struct ip6_hdr *); 1751 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 1752 if (ia == NULL) 1753 return (false); 1754 return (! (ia->ia6_flags & IN6_IFF_NOTREADY)); 1755 } 1756 #endif 1757 default: 1758 panic("Unsupported af %d", af); 1759 } 1760 1761 return (false); 1762 } 1763 1764 void 1765 pf_intr(void *v) 1766 { 1767 struct epoch_tracker et; 1768 struct pf_send_head queue; 1769 struct pf_send_entry *pfse, *next; 1770 1771 CURVNET_SET((struct vnet *)v); 1772 1773 PF_SENDQ_LOCK(); 1774 queue = V_pf_sendqueue; 1775 STAILQ_INIT(&V_pf_sendqueue); 1776 PF_SENDQ_UNLOCK(); 1777 1778 NET_EPOCH_ENTER(et); 1779 1780 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1781 switch (pfse->pfse_type) { 1782 #ifdef INET 1783 case PFSE_IP: { 1784 if (pf_isforlocal(pfse->pfse_m, AF_INET)) { 1785 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; 1786 pfse->pfse_m->m_pkthdr.csum_flags |= 1787 CSUM_IP_VALID | CSUM_IP_CHECKED; 1788 ip_input(pfse->pfse_m); 1789 } else { 1790 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, 1791 NULL); 1792 } 1793 break; 1794 } 1795 case PFSE_ICMP: 1796 icmp_error(pfse->pfse_m, pfse->icmpopts.type, 1797 pfse->icmpopts.code, 0, pfse->icmpopts.mtu); 1798 break; 1799 #endif /* INET */ 1800 #ifdef INET6 1801 case PFSE_IP6: 1802 if (pf_isforlocal(pfse->pfse_m, AF_INET6)) { 1803 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; 1804 ip6_input(pfse->pfse_m); 1805 } else { 1806 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, 1807 NULL, NULL); 1808 } 1809 break; 1810 case PFSE_ICMP6: 1811 icmp6_error(pfse->pfse_m, pfse->icmpopts.type, 1812 pfse->icmpopts.code, pfse->icmpopts.mtu); 1813 break; 1814 #endif /* INET6 */ 1815 default: 1816 panic("%s: unknown type", __func__); 1817 } 1818 free(pfse, M_PFTEMP); 1819 } 1820 NET_EPOCH_EXIT(et); 1821 CURVNET_RESTORE(); 1822 } 1823 1824 #define pf_purge_thread_period (hz / 10) 1825 1826 #ifdef PF_WANT_32_TO_64_COUNTER 1827 static void 1828 pf_status_counter_u64_periodic(void) 1829 { 1830 1831 PF_RULES_RASSERT(); 1832 1833 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 60)) != 0) { 1834 return; 1835 } 1836 1837 for (int i = 0; i < FCNT_MAX; i++) { 1838 pf_counter_u64_periodic(&V_pf_status.fcounters[i]); 1839 } 1840 } 1841 1842 static void 1843 pf_kif_counter_u64_periodic(void) 1844 { 1845 struct pfi_kkif *kif; 1846 size_t r, run; 1847 1848 PF_RULES_RASSERT(); 1849 1850 if (__predict_false(V_pf_allkifcount == 0)) { 1851 return; 1852 } 1853 1854 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { 1855 return; 1856 } 1857 1858 run = V_pf_allkifcount / 10; 1859 if (run < 5) 1860 run = 5; 1861 1862 for (r = 0; r < run; r++) { 1863 kif = LIST_NEXT(V_pf_kifmarker, pfik_allkiflist); 1864 if (kif == NULL) { 1865 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); 1866 LIST_INSERT_HEAD(&V_pf_allkiflist, V_pf_kifmarker, pfik_allkiflist); 1867 break; 1868 } 1869 1870 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); 1871 LIST_INSERT_AFTER(kif, V_pf_kifmarker, pfik_allkiflist); 1872 1873 for (int i = 0; i < 2; i++) { 1874 for (int j = 0; j < 2; j++) { 1875 for (int k = 0; k < 2; k++) { 1876 pf_counter_u64_periodic(&kif->pfik_packets[i][j][k]); 1877 pf_counter_u64_periodic(&kif->pfik_bytes[i][j][k]); 1878 } 1879 } 1880 } 1881 } 1882 } 1883 1884 static void 1885 pf_rule_counter_u64_periodic(void) 1886 { 1887 struct pf_krule *rule; 1888 size_t r, run; 1889 1890 PF_RULES_RASSERT(); 1891 1892 if (__predict_false(V_pf_allrulecount == 0)) { 1893 return; 1894 } 1895 1896 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { 1897 return; 1898 } 1899 1900 run = V_pf_allrulecount / 10; 1901 if (run < 5) 1902 run = 5; 1903 1904 for (r = 0; r < run; r++) { 1905 rule = LIST_NEXT(V_pf_rulemarker, allrulelist); 1906 if (rule == NULL) { 1907 LIST_REMOVE(V_pf_rulemarker, allrulelist); 1908 LIST_INSERT_HEAD(&V_pf_allrulelist, V_pf_rulemarker, allrulelist); 1909 break; 1910 } 1911 1912 LIST_REMOVE(V_pf_rulemarker, allrulelist); 1913 LIST_INSERT_AFTER(rule, V_pf_rulemarker, allrulelist); 1914 1915 pf_counter_u64_periodic(&rule->evaluations); 1916 for (int i = 0; i < 2; i++) { 1917 pf_counter_u64_periodic(&rule->packets[i]); 1918 pf_counter_u64_periodic(&rule->bytes[i]); 1919 } 1920 } 1921 } 1922 1923 static void 1924 pf_counter_u64_periodic_main(void) 1925 { 1926 PF_RULES_RLOCK_TRACKER; 1927 1928 V_pf_counter_periodic_iter++; 1929 1930 PF_RULES_RLOCK(); 1931 pf_counter_u64_critical_enter(); 1932 pf_status_counter_u64_periodic(); 1933 pf_kif_counter_u64_periodic(); 1934 pf_rule_counter_u64_periodic(); 1935 pf_counter_u64_critical_exit(); 1936 PF_RULES_RUNLOCK(); 1937 } 1938 #else 1939 #define pf_counter_u64_periodic_main() do { } while (0) 1940 #endif 1941 1942 void 1943 pf_purge_thread(void *unused __unused) 1944 { 1945 struct epoch_tracker et; 1946 1947 VNET_ITERATOR_DECL(vnet_iter); 1948 1949 sx_xlock(&pf_end_lock); 1950 while (pf_end_threads == 0) { 1951 sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", pf_purge_thread_period); 1952 1953 VNET_LIST_RLOCK(); 1954 NET_EPOCH_ENTER(et); 1955 VNET_FOREACH(vnet_iter) { 1956 CURVNET_SET(vnet_iter); 1957 1958 /* Wait until V_pf_default_rule is initialized. */ 1959 if (V_pf_vnet_active == 0) { 1960 CURVNET_RESTORE(); 1961 continue; 1962 } 1963 1964 pf_counter_u64_periodic_main(); 1965 1966 /* 1967 * Process 1/interval fraction of the state 1968 * table every run. 1969 */ 1970 V_pf_purge_idx = 1971 pf_purge_expired_states(V_pf_purge_idx, pf_hashmask / 1972 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1973 1974 /* 1975 * Purge other expired types every 1976 * PFTM_INTERVAL seconds. 1977 */ 1978 if (V_pf_purge_idx == 0) { 1979 /* 1980 * Order is important: 1981 * - states and src nodes reference rules 1982 * - states and rules reference kifs 1983 */ 1984 pf_purge_expired_fragments(); 1985 pf_purge_expired_src_nodes(); 1986 pf_purge_unlinked_rules(); 1987 pfi_kkif_purge(); 1988 } 1989 CURVNET_RESTORE(); 1990 } 1991 NET_EPOCH_EXIT(et); 1992 VNET_LIST_RUNLOCK(); 1993 } 1994 1995 pf_end_threads++; 1996 sx_xunlock(&pf_end_lock); 1997 kproc_exit(0); 1998 } 1999 2000 void 2001 pf_unload_vnet_purge(void) 2002 { 2003 2004 /* 2005 * To cleanse up all kifs and rules we need 2006 * two runs: first one clears reference flags, 2007 * then pf_purge_expired_states() doesn't 2008 * raise them, and then second run frees. 2009 */ 2010 pf_purge_unlinked_rules(); 2011 pfi_kkif_purge(); 2012 2013 /* 2014 * Now purge everything. 2015 */ 2016 pf_purge_expired_states(0, pf_hashmask); 2017 pf_purge_fragments(UINT_MAX); 2018 pf_purge_expired_src_nodes(); 2019 2020 /* 2021 * Now all kifs & rules should be unreferenced, 2022 * thus should be successfully freed. 2023 */ 2024 pf_purge_unlinked_rules(); 2025 pfi_kkif_purge(); 2026 } 2027 2028 u_int32_t 2029 pf_state_expires(const struct pf_kstate *state) 2030 { 2031 u_int32_t timeout; 2032 u_int32_t start; 2033 u_int32_t end; 2034 u_int32_t states; 2035 2036 /* handle all PFTM_* > PFTM_MAX here */ 2037 if (state->timeout == PFTM_PURGE) 2038 return (time_uptime); 2039 KASSERT(state->timeout != PFTM_UNLINKED, 2040 ("pf_state_expires: timeout == PFTM_UNLINKED")); 2041 KASSERT((state->timeout < PFTM_MAX), 2042 ("pf_state_expires: timeout > PFTM_MAX")); 2043 timeout = state->rule.ptr->timeout[state->timeout]; 2044 if (!timeout) 2045 timeout = V_pf_default_rule.timeout[state->timeout]; 2046 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 2047 if (start && state->rule.ptr != &V_pf_default_rule) { 2048 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 2049 states = counter_u64_fetch(state->rule.ptr->states_cur); 2050 } else { 2051 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 2052 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 2053 states = V_pf_status.states; 2054 } 2055 if (end && states > start && start < end) { 2056 if (states < end) { 2057 timeout = (u_int64_t)timeout * (end - states) / 2058 (end - start); 2059 return ((state->expire / 1000) + timeout); 2060 } 2061 else 2062 return (time_uptime); 2063 } 2064 return ((state->expire / 1000) + timeout); 2065 } 2066 2067 void 2068 pf_purge_expired_src_nodes(void) 2069 { 2070 struct pf_ksrc_node_list freelist; 2071 struct pf_srchash *sh; 2072 struct pf_ksrc_node *cur, *next; 2073 int i; 2074 2075 LIST_INIT(&freelist); 2076 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 2077 PF_HASHROW_LOCK(sh); 2078 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 2079 if (cur->states == 0 && cur->expire <= time_uptime) { 2080 pf_unlink_src_node(cur); 2081 LIST_INSERT_HEAD(&freelist, cur, entry); 2082 } else if (cur->rule.ptr != NULL) 2083 cur->rule.ptr->rule_ref |= PFRULE_REFS; 2084 PF_HASHROW_UNLOCK(sh); 2085 } 2086 2087 pf_free_src_nodes(&freelist); 2088 2089 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 2090 } 2091 2092 static void 2093 pf_src_tree_remove_state(struct pf_kstate *s) 2094 { 2095 struct pf_ksrc_node *sn; 2096 uint32_t timeout; 2097 2098 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ? 2099 s->rule.ptr->timeout[PFTM_SRC_NODE] : 2100 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 2101 2102 if (s->src_node != NULL) { 2103 sn = s->src_node; 2104 PF_SRC_NODE_LOCK(sn); 2105 if (s->src.tcp_est) 2106 --sn->conn; 2107 if (--sn->states == 0) 2108 sn->expire = time_uptime + timeout; 2109 PF_SRC_NODE_UNLOCK(sn); 2110 } 2111 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 2112 sn = s->nat_src_node; 2113 PF_SRC_NODE_LOCK(sn); 2114 if (--sn->states == 0) 2115 sn->expire = time_uptime + timeout; 2116 PF_SRC_NODE_UNLOCK(sn); 2117 } 2118 s->src_node = s->nat_src_node = NULL; 2119 } 2120 2121 /* 2122 * Unlink and potentilly free a state. Function may be 2123 * called with ID hash row locked, but always returns 2124 * unlocked, since it needs to go through key hash locking. 2125 */ 2126 int 2127 pf_unlink_state(struct pf_kstate *s) 2128 { 2129 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 2130 2131 NET_EPOCH_ASSERT(); 2132 PF_HASHROW_ASSERT(ih); 2133 2134 if (s->timeout == PFTM_UNLINKED) { 2135 /* 2136 * State is being processed 2137 * by pf_unlink_state() in 2138 * an other thread. 2139 */ 2140 PF_HASHROW_UNLOCK(ih); 2141 return (0); /* XXXGL: undefined actually */ 2142 } 2143 2144 if (s->src.state == PF_TCPS_PROXY_DST) { 2145 /* XXX wire key the right one? */ 2146 pf_send_tcp(s->rule.ptr, s->key[PF_SK_WIRE]->af, 2147 &s->key[PF_SK_WIRE]->addr[1], 2148 &s->key[PF_SK_WIRE]->addr[0], 2149 s->key[PF_SK_WIRE]->port[1], 2150 s->key[PF_SK_WIRE]->port[0], 2151 s->src.seqhi, s->src.seqlo + 1, 2152 TH_RST|TH_ACK, 0, 0, 0, true, s->tag, 0, s->act.rtableid); 2153 } 2154 2155 LIST_REMOVE(s, entry); 2156 pf_src_tree_remove_state(s); 2157 2158 if (V_pfsync_delete_state_ptr != NULL) 2159 V_pfsync_delete_state_ptr(s); 2160 2161 STATE_DEC_COUNTERS(s); 2162 2163 s->timeout = PFTM_UNLINKED; 2164 2165 /* Ensure we remove it from the list of halfopen states, if needed. */ 2166 if (s->key[PF_SK_STACK] != NULL && 2167 s->key[PF_SK_STACK]->proto == IPPROTO_TCP) 2168 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED); 2169 2170 PF_HASHROW_UNLOCK(ih); 2171 2172 pf_detach_state(s); 2173 /* pf_state_insert() initialises refs to 2 */ 2174 return (pf_release_staten(s, 2)); 2175 } 2176 2177 struct pf_kstate * 2178 pf_alloc_state(int flags) 2179 { 2180 2181 return (uma_zalloc(V_pf_state_z, flags | M_ZERO)); 2182 } 2183 2184 void 2185 pf_free_state(struct pf_kstate *cur) 2186 { 2187 struct pf_krule_item *ri; 2188 2189 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 2190 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 2191 cur->timeout)); 2192 2193 while ((ri = SLIST_FIRST(&cur->match_rules))) { 2194 SLIST_REMOVE_HEAD(&cur->match_rules, entry); 2195 free(ri, M_PF_RULE_ITEM); 2196 } 2197 2198 pf_normalize_tcp_cleanup(cur); 2199 uma_zfree(V_pf_state_z, cur); 2200 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 2201 } 2202 2203 /* 2204 * Called only from pf_purge_thread(), thus serialized. 2205 */ 2206 static u_int 2207 pf_purge_expired_states(u_int i, int maxcheck) 2208 { 2209 struct pf_idhash *ih; 2210 struct pf_kstate *s; 2211 struct pf_krule_item *mrm; 2212 size_t count __unused; 2213 2214 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2215 2216 /* 2217 * Go through hash and unlink states that expire now. 2218 */ 2219 while (maxcheck > 0) { 2220 count = 0; 2221 ih = &V_pf_idhash[i]; 2222 2223 /* only take the lock if we expect to do work */ 2224 if (!LIST_EMPTY(&ih->states)) { 2225 relock: 2226 PF_HASHROW_LOCK(ih); 2227 LIST_FOREACH(s, &ih->states, entry) { 2228 if (pf_state_expires(s) <= time_uptime) { 2229 V_pf_status.states -= 2230 pf_unlink_state(s); 2231 goto relock; 2232 } 2233 s->rule.ptr->rule_ref |= PFRULE_REFS; 2234 if (s->nat_rule.ptr != NULL) 2235 s->nat_rule.ptr->rule_ref |= PFRULE_REFS; 2236 if (s->anchor.ptr != NULL) 2237 s->anchor.ptr->rule_ref |= PFRULE_REFS; 2238 s->kif->pfik_flags |= PFI_IFLAG_REFS; 2239 SLIST_FOREACH(mrm, &s->match_rules, entry) 2240 mrm->r->rule_ref |= PFRULE_REFS; 2241 if (s->rt_kif) 2242 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 2243 count++; 2244 } 2245 PF_HASHROW_UNLOCK(ih); 2246 } 2247 2248 SDT_PROBE2(pf, purge, state, rowcount, i, count); 2249 2250 /* Return when we hit end of hash. */ 2251 if (++i > pf_hashmask) { 2252 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2253 return (0); 2254 } 2255 2256 maxcheck--; 2257 } 2258 2259 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2260 2261 return (i); 2262 } 2263 2264 static void 2265 pf_purge_unlinked_rules(void) 2266 { 2267 struct pf_krulequeue tmpq; 2268 struct pf_krule *r, *r1; 2269 2270 /* 2271 * If we have overloading task pending, then we'd 2272 * better skip purging this time. There is a tiny 2273 * probability that overloading task references 2274 * an already unlinked rule. 2275 */ 2276 PF_OVERLOADQ_LOCK(); 2277 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 2278 PF_OVERLOADQ_UNLOCK(); 2279 return; 2280 } 2281 PF_OVERLOADQ_UNLOCK(); 2282 2283 /* 2284 * Do naive mark-and-sweep garbage collecting of old rules. 2285 * Reference flag is raised by pf_purge_expired_states() 2286 * and pf_purge_expired_src_nodes(). 2287 * 2288 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 2289 * use a temporary queue. 2290 */ 2291 TAILQ_INIT(&tmpq); 2292 PF_UNLNKDRULES_LOCK(); 2293 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 2294 if (!(r->rule_ref & PFRULE_REFS)) { 2295 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 2296 TAILQ_INSERT_TAIL(&tmpq, r, entries); 2297 } else 2298 r->rule_ref &= ~PFRULE_REFS; 2299 } 2300 PF_UNLNKDRULES_UNLOCK(); 2301 2302 if (!TAILQ_EMPTY(&tmpq)) { 2303 PF_CONFIG_LOCK(); 2304 PF_RULES_WLOCK(); 2305 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 2306 TAILQ_REMOVE(&tmpq, r, entries); 2307 pf_free_rule(r); 2308 } 2309 PF_RULES_WUNLOCK(); 2310 PF_CONFIG_UNLOCK(); 2311 } 2312 } 2313 2314 void 2315 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 2316 { 2317 switch (af) { 2318 #ifdef INET 2319 case AF_INET: { 2320 u_int32_t a = ntohl(addr->addr32[0]); 2321 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 2322 (a>>8)&255, a&255); 2323 if (p) { 2324 p = ntohs(p); 2325 printf(":%u", p); 2326 } 2327 break; 2328 } 2329 #endif /* INET */ 2330 #ifdef INET6 2331 case AF_INET6: { 2332 u_int16_t b; 2333 u_int8_t i, curstart, curend, maxstart, maxend; 2334 curstart = curend = maxstart = maxend = 255; 2335 for (i = 0; i < 8; i++) { 2336 if (!addr->addr16[i]) { 2337 if (curstart == 255) 2338 curstart = i; 2339 curend = i; 2340 } else { 2341 if ((curend - curstart) > 2342 (maxend - maxstart)) { 2343 maxstart = curstart; 2344 maxend = curend; 2345 } 2346 curstart = curend = 255; 2347 } 2348 } 2349 if ((curend - curstart) > 2350 (maxend - maxstart)) { 2351 maxstart = curstart; 2352 maxend = curend; 2353 } 2354 for (i = 0; i < 8; i++) { 2355 if (i >= maxstart && i <= maxend) { 2356 if (i == 0) 2357 printf(":"); 2358 if (i == maxend) 2359 printf(":"); 2360 } else { 2361 b = ntohs(addr->addr16[i]); 2362 printf("%x", b); 2363 if (i < 7) 2364 printf(":"); 2365 } 2366 } 2367 if (p) { 2368 p = ntohs(p); 2369 printf("[%u]", p); 2370 } 2371 break; 2372 } 2373 #endif /* INET6 */ 2374 } 2375 } 2376 2377 void 2378 pf_print_state(struct pf_kstate *s) 2379 { 2380 pf_print_state_parts(s, NULL, NULL); 2381 } 2382 2383 static void 2384 pf_print_state_parts(struct pf_kstate *s, 2385 struct pf_state_key *skwp, struct pf_state_key *sksp) 2386 { 2387 struct pf_state_key *skw, *sks; 2388 u_int8_t proto, dir; 2389 2390 /* Do our best to fill these, but they're skipped if NULL */ 2391 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 2392 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 2393 proto = skw ? skw->proto : (sks ? sks->proto : 0); 2394 dir = s ? s->direction : 0; 2395 2396 switch (proto) { 2397 case IPPROTO_IPV4: 2398 printf("IPv4"); 2399 break; 2400 case IPPROTO_IPV6: 2401 printf("IPv6"); 2402 break; 2403 case IPPROTO_TCP: 2404 printf("TCP"); 2405 break; 2406 case IPPROTO_UDP: 2407 printf("UDP"); 2408 break; 2409 case IPPROTO_ICMP: 2410 printf("ICMP"); 2411 break; 2412 case IPPROTO_ICMPV6: 2413 printf("ICMPv6"); 2414 break; 2415 default: 2416 printf("%u", proto); 2417 break; 2418 } 2419 switch (dir) { 2420 case PF_IN: 2421 printf(" in"); 2422 break; 2423 case PF_OUT: 2424 printf(" out"); 2425 break; 2426 } 2427 if (skw) { 2428 printf(" wire: "); 2429 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 2430 printf(" "); 2431 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 2432 } 2433 if (sks) { 2434 printf(" stack: "); 2435 if (sks != skw) { 2436 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 2437 printf(" "); 2438 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 2439 } else 2440 printf("-"); 2441 } 2442 if (s) { 2443 if (proto == IPPROTO_TCP) { 2444 printf(" [lo=%u high=%u win=%u modulator=%u", 2445 s->src.seqlo, s->src.seqhi, 2446 s->src.max_win, s->src.seqdiff); 2447 if (s->src.wscale && s->dst.wscale) 2448 printf(" wscale=%u", 2449 s->src.wscale & PF_WSCALE_MASK); 2450 printf("]"); 2451 printf(" [lo=%u high=%u win=%u modulator=%u", 2452 s->dst.seqlo, s->dst.seqhi, 2453 s->dst.max_win, s->dst.seqdiff); 2454 if (s->src.wscale && s->dst.wscale) 2455 printf(" wscale=%u", 2456 s->dst.wscale & PF_WSCALE_MASK); 2457 printf("]"); 2458 } 2459 printf(" %u:%u", s->src.state, s->dst.state); 2460 } 2461 } 2462 2463 void 2464 pf_print_flags(u_int8_t f) 2465 { 2466 if (f) 2467 printf(" "); 2468 if (f & TH_FIN) 2469 printf("F"); 2470 if (f & TH_SYN) 2471 printf("S"); 2472 if (f & TH_RST) 2473 printf("R"); 2474 if (f & TH_PUSH) 2475 printf("P"); 2476 if (f & TH_ACK) 2477 printf("A"); 2478 if (f & TH_URG) 2479 printf("U"); 2480 if (f & TH_ECE) 2481 printf("E"); 2482 if (f & TH_CWR) 2483 printf("W"); 2484 } 2485 2486 #define PF_SET_SKIP_STEPS(i) \ 2487 do { \ 2488 while (head[i] != cur) { \ 2489 head[i]->skip[i].ptr = cur; \ 2490 head[i] = TAILQ_NEXT(head[i], entries); \ 2491 } \ 2492 } while (0) 2493 2494 void 2495 pf_calc_skip_steps(struct pf_krulequeue *rules) 2496 { 2497 struct pf_krule *cur, *prev, *head[PF_SKIP_COUNT]; 2498 int i; 2499 2500 cur = TAILQ_FIRST(rules); 2501 prev = cur; 2502 for (i = 0; i < PF_SKIP_COUNT; ++i) 2503 head[i] = cur; 2504 while (cur != NULL) { 2505 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 2506 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 2507 if (cur->direction != prev->direction) 2508 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 2509 if (cur->af != prev->af) 2510 PF_SET_SKIP_STEPS(PF_SKIP_AF); 2511 if (cur->proto != prev->proto) 2512 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 2513 if (cur->src.neg != prev->src.neg || 2514 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 2515 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 2516 if (cur->src.port[0] != prev->src.port[0] || 2517 cur->src.port[1] != prev->src.port[1] || 2518 cur->src.port_op != prev->src.port_op) 2519 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 2520 if (cur->dst.neg != prev->dst.neg || 2521 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 2522 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 2523 if (cur->dst.port[0] != prev->dst.port[0] || 2524 cur->dst.port[1] != prev->dst.port[1] || 2525 cur->dst.port_op != prev->dst.port_op) 2526 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 2527 2528 prev = cur; 2529 cur = TAILQ_NEXT(cur, entries); 2530 } 2531 for (i = 0; i < PF_SKIP_COUNT; ++i) 2532 PF_SET_SKIP_STEPS(i); 2533 } 2534 2535 int 2536 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 2537 { 2538 if (aw1->type != aw2->type) 2539 return (1); 2540 switch (aw1->type) { 2541 case PF_ADDR_ADDRMASK: 2542 case PF_ADDR_RANGE: 2543 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6)) 2544 return (1); 2545 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6)) 2546 return (1); 2547 return (0); 2548 case PF_ADDR_DYNIFTL: 2549 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 2550 case PF_ADDR_NOROUTE: 2551 case PF_ADDR_URPFFAILED: 2552 return (0); 2553 case PF_ADDR_TABLE: 2554 return (aw1->p.tbl != aw2->p.tbl); 2555 default: 2556 printf("invalid address type: %d\n", aw1->type); 2557 return (1); 2558 } 2559 } 2560 2561 /** 2562 * Checksum updates are a little complicated because the checksum in the TCP/UDP 2563 * header isn't always a full checksum. In some cases (i.e. output) it's a 2564 * pseudo-header checksum, which is a partial checksum over src/dst IP 2565 * addresses, protocol number and length. 2566 * 2567 * That means we have the following cases: 2568 * * Input or forwarding: we don't have TSO, the checksum fields are full 2569 * checksums, we need to update the checksum whenever we change anything. 2570 * * Output (i.e. the checksum is a pseudo-header checksum): 2571 * x The field being updated is src/dst address or affects the length of 2572 * the packet. We need to update the pseudo-header checksum (note that this 2573 * checksum is not ones' complement). 2574 * x Some other field is being modified (e.g. src/dst port numbers): We 2575 * don't have to update anything. 2576 **/ 2577 u_int16_t 2578 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2579 { 2580 u_int32_t x; 2581 2582 x = cksum + old - new; 2583 x = (x + (x >> 16)) & 0xffff; 2584 2585 /* optimise: eliminate a branch when not udp */ 2586 if (udp && cksum == 0x0000) 2587 return cksum; 2588 if (udp && x == 0x0000) 2589 x = 0xffff; 2590 2591 return (u_int16_t)(x); 2592 } 2593 2594 static void 2595 pf_patch_8(struct mbuf *m, u_int16_t *cksum, u_int8_t *f, u_int8_t v, bool hi, 2596 u_int8_t udp) 2597 { 2598 u_int16_t old = htons(hi ? (*f << 8) : *f); 2599 u_int16_t new = htons(hi ? ( v << 8) : v); 2600 2601 if (*f == v) 2602 return; 2603 2604 *f = v; 2605 2606 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2607 return; 2608 2609 *cksum = pf_cksum_fixup(*cksum, old, new, udp); 2610 } 2611 2612 void 2613 pf_patch_16_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int16_t v, 2614 bool hi, u_int8_t udp) 2615 { 2616 u_int8_t *fb = (u_int8_t *)f; 2617 u_int8_t *vb = (u_int8_t *)&v; 2618 2619 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2620 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2621 } 2622 2623 void 2624 pf_patch_32_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int32_t v, 2625 bool hi, u_int8_t udp) 2626 { 2627 u_int8_t *fb = (u_int8_t *)f; 2628 u_int8_t *vb = (u_int8_t *)&v; 2629 2630 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2631 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2632 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2633 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2634 } 2635 2636 u_int16_t 2637 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old, 2638 u_int16_t new, u_int8_t udp) 2639 { 2640 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2641 return (cksum); 2642 2643 return (pf_cksum_fixup(cksum, old, new, udp)); 2644 } 2645 2646 static void 2647 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic, 2648 u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, 2649 sa_family_t af) 2650 { 2651 struct pf_addr ao; 2652 u_int16_t po = *p; 2653 2654 PF_ACPY(&ao, a, af); 2655 PF_ACPY(a, an, af); 2656 2657 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2658 *pc = ~*pc; 2659 2660 *p = pn; 2661 2662 switch (af) { 2663 #ifdef INET 2664 case AF_INET: 2665 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2666 ao.addr16[0], an->addr16[0], 0), 2667 ao.addr16[1], an->addr16[1], 0); 2668 *p = pn; 2669 2670 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc, 2671 ao.addr16[0], an->addr16[0], u), 2672 ao.addr16[1], an->addr16[1], u); 2673 2674 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2675 break; 2676 #endif /* INET */ 2677 #ifdef INET6 2678 case AF_INET6: 2679 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2680 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2681 pf_cksum_fixup(pf_cksum_fixup(*pc, 2682 ao.addr16[0], an->addr16[0], u), 2683 ao.addr16[1], an->addr16[1], u), 2684 ao.addr16[2], an->addr16[2], u), 2685 ao.addr16[3], an->addr16[3], u), 2686 ao.addr16[4], an->addr16[4], u), 2687 ao.addr16[5], an->addr16[5], u), 2688 ao.addr16[6], an->addr16[6], u), 2689 ao.addr16[7], an->addr16[7], u); 2690 2691 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2692 break; 2693 #endif /* INET6 */ 2694 } 2695 2696 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | 2697 CSUM_DELAY_DATA_IPV6)) { 2698 *pc = ~*pc; 2699 if (! *pc) 2700 *pc = 0xffff; 2701 } 2702 } 2703 2704 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2705 void 2706 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2707 { 2708 u_int32_t ao; 2709 2710 memcpy(&ao, a, sizeof(ao)); 2711 memcpy(a, &an, sizeof(u_int32_t)); 2712 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2713 ao % 65536, an % 65536, u); 2714 } 2715 2716 void 2717 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp) 2718 { 2719 u_int32_t ao; 2720 2721 memcpy(&ao, a, sizeof(ao)); 2722 memcpy(a, &an, sizeof(u_int32_t)); 2723 2724 *c = pf_proto_cksum_fixup(m, 2725 pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp), 2726 ao % 65536, an % 65536, udp); 2727 } 2728 2729 #ifdef INET6 2730 static void 2731 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2732 { 2733 struct pf_addr ao; 2734 2735 PF_ACPY(&ao, a, AF_INET6); 2736 PF_ACPY(a, an, AF_INET6); 2737 2738 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2739 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2740 pf_cksum_fixup(pf_cksum_fixup(*c, 2741 ao.addr16[0], an->addr16[0], u), 2742 ao.addr16[1], an->addr16[1], u), 2743 ao.addr16[2], an->addr16[2], u), 2744 ao.addr16[3], an->addr16[3], u), 2745 ao.addr16[4], an->addr16[4], u), 2746 ao.addr16[5], an->addr16[5], u), 2747 ao.addr16[6], an->addr16[6], u), 2748 ao.addr16[7], an->addr16[7], u); 2749 } 2750 #endif /* INET6 */ 2751 2752 static void 2753 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2754 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2755 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2756 { 2757 struct pf_addr oia, ooa; 2758 2759 PF_ACPY(&oia, ia, af); 2760 if (oa) 2761 PF_ACPY(&ooa, oa, af); 2762 2763 /* Change inner protocol port, fix inner protocol checksum. */ 2764 if (ip != NULL) { 2765 u_int16_t oip = *ip; 2766 u_int32_t opc; 2767 2768 if (pc != NULL) 2769 opc = *pc; 2770 *ip = np; 2771 if (pc != NULL) 2772 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2773 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2774 if (pc != NULL) 2775 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2776 } 2777 /* Change inner ip address, fix inner ip and icmp checksums. */ 2778 PF_ACPY(ia, na, af); 2779 switch (af) { 2780 #ifdef INET 2781 case AF_INET: { 2782 u_int32_t oh2c = *h2c; 2783 2784 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2785 oia.addr16[0], ia->addr16[0], 0), 2786 oia.addr16[1], ia->addr16[1], 0); 2787 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2788 oia.addr16[0], ia->addr16[0], 0), 2789 oia.addr16[1], ia->addr16[1], 0); 2790 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2791 break; 2792 } 2793 #endif /* INET */ 2794 #ifdef INET6 2795 case AF_INET6: 2796 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2797 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2798 pf_cksum_fixup(pf_cksum_fixup(*ic, 2799 oia.addr16[0], ia->addr16[0], u), 2800 oia.addr16[1], ia->addr16[1], u), 2801 oia.addr16[2], ia->addr16[2], u), 2802 oia.addr16[3], ia->addr16[3], u), 2803 oia.addr16[4], ia->addr16[4], u), 2804 oia.addr16[5], ia->addr16[5], u), 2805 oia.addr16[6], ia->addr16[6], u), 2806 oia.addr16[7], ia->addr16[7], u); 2807 break; 2808 #endif /* INET6 */ 2809 } 2810 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2811 if (oa) { 2812 PF_ACPY(oa, na, af); 2813 switch (af) { 2814 #ifdef INET 2815 case AF_INET: 2816 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2817 ooa.addr16[0], oa->addr16[0], 0), 2818 ooa.addr16[1], oa->addr16[1], 0); 2819 break; 2820 #endif /* INET */ 2821 #ifdef INET6 2822 case AF_INET6: 2823 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2824 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2825 pf_cksum_fixup(pf_cksum_fixup(*ic, 2826 ooa.addr16[0], oa->addr16[0], u), 2827 ooa.addr16[1], oa->addr16[1], u), 2828 ooa.addr16[2], oa->addr16[2], u), 2829 ooa.addr16[3], oa->addr16[3], u), 2830 ooa.addr16[4], oa->addr16[4], u), 2831 ooa.addr16[5], oa->addr16[5], u), 2832 ooa.addr16[6], oa->addr16[6], u), 2833 ooa.addr16[7], oa->addr16[7], u); 2834 break; 2835 #endif /* INET6 */ 2836 } 2837 } 2838 } 2839 2840 /* 2841 * Need to modulate the sequence numbers in the TCP SACK option 2842 * (credits to Krzysztof Pfaff for report and patch) 2843 */ 2844 static int 2845 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2846 struct tcphdr *th, struct pf_state_peer *dst) 2847 { 2848 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2849 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2850 int copyback = 0, i, olen; 2851 struct sackblk sack; 2852 2853 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2854 if (hlen < TCPOLEN_SACKLEN || 2855 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2856 return 0; 2857 2858 while (hlen >= TCPOLEN_SACKLEN) { 2859 size_t startoff = opt - opts; 2860 olen = opt[1]; 2861 switch (*opt) { 2862 case TCPOPT_EOL: /* FALLTHROUGH */ 2863 case TCPOPT_NOP: 2864 opt++; 2865 hlen--; 2866 break; 2867 case TCPOPT_SACK: 2868 if (olen > hlen) 2869 olen = hlen; 2870 if (olen >= TCPOLEN_SACKLEN) { 2871 for (i = 2; i + TCPOLEN_SACK <= olen; 2872 i += TCPOLEN_SACK) { 2873 memcpy(&sack, &opt[i], sizeof(sack)); 2874 pf_patch_32_unaligned(m, 2875 &th->th_sum, &sack.start, 2876 htonl(ntohl(sack.start) - dst->seqdiff), 2877 PF_ALGNMNT(startoff), 2878 0); 2879 pf_patch_32_unaligned(m, &th->th_sum, 2880 &sack.end, 2881 htonl(ntohl(sack.end) - dst->seqdiff), 2882 PF_ALGNMNT(startoff), 2883 0); 2884 memcpy(&opt[i], &sack, sizeof(sack)); 2885 } 2886 copyback = 1; 2887 } 2888 /* FALLTHROUGH */ 2889 default: 2890 if (olen < 2) 2891 olen = 2; 2892 hlen -= olen; 2893 opt += olen; 2894 } 2895 } 2896 2897 if (copyback) 2898 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2899 return (copyback); 2900 } 2901 2902 struct mbuf * 2903 pf_build_tcp(const struct pf_krule *r, sa_family_t af, 2904 const struct pf_addr *saddr, const struct pf_addr *daddr, 2905 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2906 u_int8_t tcp_flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, 2907 bool skip_firewall, u_int16_t mtag_tag, u_int16_t mtag_flags, int rtableid) 2908 { 2909 struct mbuf *m; 2910 int len, tlen; 2911 #ifdef INET 2912 struct ip *h = NULL; 2913 #endif /* INET */ 2914 #ifdef INET6 2915 struct ip6_hdr *h6 = NULL; 2916 #endif /* INET6 */ 2917 struct tcphdr *th; 2918 char *opt; 2919 struct pf_mtag *pf_mtag; 2920 2921 len = 0; 2922 th = NULL; 2923 2924 /* maximum segment size tcp option */ 2925 tlen = sizeof(struct tcphdr); 2926 if (mss) 2927 tlen += 4; 2928 2929 switch (af) { 2930 #ifdef INET 2931 case AF_INET: 2932 len = sizeof(struct ip) + tlen; 2933 break; 2934 #endif /* INET */ 2935 #ifdef INET6 2936 case AF_INET6: 2937 len = sizeof(struct ip6_hdr) + tlen; 2938 break; 2939 #endif /* INET6 */ 2940 default: 2941 panic("%s: unsupported af %d", __func__, af); 2942 } 2943 2944 m = m_gethdr(M_NOWAIT, MT_DATA); 2945 if (m == NULL) 2946 return (NULL); 2947 2948 #ifdef MAC 2949 mac_netinet_firewall_send(m); 2950 #endif 2951 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2952 m_freem(m); 2953 return (NULL); 2954 } 2955 if (skip_firewall) 2956 m->m_flags |= M_SKIP_FIREWALL; 2957 pf_mtag->tag = mtag_tag; 2958 pf_mtag->flags = mtag_flags; 2959 2960 if (rtableid >= 0) 2961 M_SETFIB(m, rtableid); 2962 2963 #ifdef ALTQ 2964 if (r != NULL && r->qid) { 2965 pf_mtag->qid = r->qid; 2966 2967 /* add hints for ecn */ 2968 pf_mtag->hdr = mtod(m, struct ip *); 2969 } 2970 #endif /* ALTQ */ 2971 m->m_data += max_linkhdr; 2972 m->m_pkthdr.len = m->m_len = len; 2973 /* The rest of the stack assumes a rcvif, so provide one. 2974 * This is a locally generated packet, so .. close enough. */ 2975 m->m_pkthdr.rcvif = V_loif; 2976 bzero(m->m_data, len); 2977 switch (af) { 2978 #ifdef INET 2979 case AF_INET: 2980 h = mtod(m, struct ip *); 2981 2982 /* IP header fields included in the TCP checksum */ 2983 h->ip_p = IPPROTO_TCP; 2984 h->ip_len = htons(tlen); 2985 h->ip_src.s_addr = saddr->v4.s_addr; 2986 h->ip_dst.s_addr = daddr->v4.s_addr; 2987 2988 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2989 break; 2990 #endif /* INET */ 2991 #ifdef INET6 2992 case AF_INET6: 2993 h6 = mtod(m, struct ip6_hdr *); 2994 2995 /* IP header fields included in the TCP checksum */ 2996 h6->ip6_nxt = IPPROTO_TCP; 2997 h6->ip6_plen = htons(tlen); 2998 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2999 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 3000 3001 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 3002 break; 3003 #endif /* INET6 */ 3004 } 3005 3006 /* TCP header */ 3007 th->th_sport = sport; 3008 th->th_dport = dport; 3009 th->th_seq = htonl(seq); 3010 th->th_ack = htonl(ack); 3011 th->th_off = tlen >> 2; 3012 th->th_flags = tcp_flags; 3013 th->th_win = htons(win); 3014 3015 if (mss) { 3016 opt = (char *)(th + 1); 3017 opt[0] = TCPOPT_MAXSEG; 3018 opt[1] = 4; 3019 HTONS(mss); 3020 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 3021 } 3022 3023 switch (af) { 3024 #ifdef INET 3025 case AF_INET: 3026 /* TCP checksum */ 3027 th->th_sum = in_cksum(m, len); 3028 3029 /* Finish the IP header */ 3030 h->ip_v = 4; 3031 h->ip_hl = sizeof(*h) >> 2; 3032 h->ip_tos = IPTOS_LOWDELAY; 3033 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 3034 h->ip_len = htons(len); 3035 h->ip_ttl = ttl ? ttl : V_ip_defttl; 3036 h->ip_sum = 0; 3037 break; 3038 #endif /* INET */ 3039 #ifdef INET6 3040 case AF_INET6: 3041 /* TCP checksum */ 3042 th->th_sum = in6_cksum(m, IPPROTO_TCP, 3043 sizeof(struct ip6_hdr), tlen); 3044 3045 h6->ip6_vfc |= IPV6_VERSION; 3046 h6->ip6_hlim = IPV6_DEFHLIM; 3047 break; 3048 #endif /* INET6 */ 3049 } 3050 3051 return (m); 3052 } 3053 3054 static void 3055 pf_send_sctp_abort(sa_family_t af, struct pf_pdesc *pd, 3056 uint8_t ttl, int rtableid) 3057 { 3058 struct mbuf *m; 3059 #ifdef INET 3060 struct ip *h = NULL; 3061 #endif /* INET */ 3062 #ifdef INET6 3063 struct ip6_hdr *h6 = NULL; 3064 #endif /* INET6 */ 3065 struct sctphdr *hdr; 3066 struct sctp_chunkhdr *chunk; 3067 struct pf_send_entry *pfse; 3068 int off = 0; 3069 3070 MPASS(af == pd->af); 3071 3072 m = m_gethdr(M_NOWAIT, MT_DATA); 3073 if (m == NULL) 3074 return; 3075 3076 m->m_data += max_linkhdr; 3077 m->m_flags |= M_SKIP_FIREWALL; 3078 /* The rest of the stack assumes a rcvif, so provide one. 3079 * This is a locally generated packet, so .. close enough. */ 3080 m->m_pkthdr.rcvif = V_loif; 3081 3082 /* IPv4|6 header */ 3083 switch (af) { 3084 #ifdef INET 3085 case AF_INET: 3086 bzero(m->m_data, sizeof(struct ip) + sizeof(*hdr) + sizeof(*chunk)); 3087 3088 h = mtod(m, struct ip *); 3089 3090 /* IP header fields included in the TCP checksum */ 3091 3092 h->ip_p = IPPROTO_SCTP; 3093 h->ip_len = htons(sizeof(*h) + sizeof(*hdr) + sizeof(*chunk)); 3094 h->ip_ttl = ttl ? ttl : V_ip_defttl; 3095 h->ip_src = pd->dst->v4; 3096 h->ip_dst = pd->src->v4; 3097 3098 off += sizeof(struct ip); 3099 break; 3100 #endif /* INET */ 3101 #ifdef INET6 3102 case AF_INET6: 3103 bzero(m->m_data, sizeof(struct ip6_hdr) + sizeof(*hdr) + sizeof(*chunk)); 3104 3105 h6 = mtod(m, struct ip6_hdr *); 3106 3107 /* IP header fields included in the TCP checksum */ 3108 h6->ip6_vfc |= IPV6_VERSION; 3109 h6->ip6_nxt = IPPROTO_SCTP; 3110 h6->ip6_plen = htons(sizeof(*h6) + sizeof(*hdr) + sizeof(*chunk)); 3111 h6->ip6_hlim = ttl ? ttl : V_ip6_defhlim; 3112 memcpy(&h6->ip6_src, &pd->dst->v6, sizeof(struct in6_addr)); 3113 memcpy(&h6->ip6_dst, &pd->src->v6, sizeof(struct in6_addr)); 3114 3115 off += sizeof(struct ip6_hdr); 3116 break; 3117 #endif /* INET6 */ 3118 } 3119 3120 /* SCTP header */ 3121 hdr = mtodo(m, off); 3122 3123 hdr->src_port = pd->hdr.sctp.dest_port; 3124 hdr->dest_port = pd->hdr.sctp.src_port; 3125 hdr->v_tag = pd->sctp_initiate_tag; 3126 hdr->checksum = 0; 3127 3128 /* Abort chunk. */ 3129 off += sizeof(struct sctphdr); 3130 chunk = mtodo(m, off); 3131 3132 chunk->chunk_type = SCTP_ABORT_ASSOCIATION; 3133 chunk->chunk_length = htons(sizeof(*chunk)); 3134 3135 /* SCTP checksum */ 3136 off += sizeof(*chunk); 3137 m->m_pkthdr.len = m->m_len = off; 3138 3139 pf_sctp_checksum(m, off - sizeof(*hdr) - sizeof(*chunk));; 3140 3141 if (rtableid >= 0) 3142 M_SETFIB(m, rtableid); 3143 3144 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3145 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3146 if (pfse == NULL) { 3147 m_freem(m); 3148 return; 3149 } 3150 3151 switch (af) { 3152 #ifdef INET 3153 case AF_INET: 3154 pfse->pfse_type = PFSE_IP; 3155 break; 3156 #endif /* INET */ 3157 #ifdef INET6 3158 case AF_INET6: 3159 pfse->pfse_type = PFSE_IP6; 3160 break; 3161 #endif /* INET6 */ 3162 } 3163 3164 pfse->pfse_m = m; 3165 pf_send(pfse); 3166 } 3167 3168 void 3169 pf_send_tcp(const struct pf_krule *r, sa_family_t af, 3170 const struct pf_addr *saddr, const struct pf_addr *daddr, 3171 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 3172 u_int8_t tcp_flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, 3173 bool skip_firewall, u_int16_t mtag_tag, u_int16_t mtag_flags, int rtableid) 3174 { 3175 struct pf_send_entry *pfse; 3176 struct mbuf *m; 3177 3178 m = pf_build_tcp(r, af, saddr, daddr, sport, dport, seq, ack, tcp_flags, 3179 win, mss, ttl, skip_firewall, mtag_tag, mtag_flags, rtableid); 3180 if (m == NULL) 3181 return; 3182 3183 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3184 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3185 if (pfse == NULL) { 3186 m_freem(m); 3187 return; 3188 } 3189 3190 switch (af) { 3191 #ifdef INET 3192 case AF_INET: 3193 pfse->pfse_type = PFSE_IP; 3194 break; 3195 #endif /* INET */ 3196 #ifdef INET6 3197 case AF_INET6: 3198 pfse->pfse_type = PFSE_IP6; 3199 break; 3200 #endif /* INET6 */ 3201 } 3202 3203 pfse->pfse_m = m; 3204 pf_send(pfse); 3205 } 3206 3207 static void 3208 pf_return(struct pf_krule *r, struct pf_krule *nr, struct pf_pdesc *pd, 3209 struct pf_state_key *sk, int off, struct mbuf *m, struct tcphdr *th, 3210 struct pfi_kkif *kif, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen, 3211 u_short *reason, int rtableid) 3212 { 3213 struct pf_addr * const saddr = pd->src; 3214 struct pf_addr * const daddr = pd->dst; 3215 sa_family_t af = pd->af; 3216 3217 /* undo NAT changes, if they have taken place */ 3218 if (nr != NULL) { 3219 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 3220 PF_ACPY(daddr, &sk->addr[pd->didx], af); 3221 if (pd->sport) 3222 *pd->sport = sk->port[pd->sidx]; 3223 if (pd->dport) 3224 *pd->dport = sk->port[pd->didx]; 3225 if (pd->proto_sum) 3226 *pd->proto_sum = bproto_sum; 3227 if (pd->ip_sum) 3228 *pd->ip_sum = bip_sum; 3229 m_copyback(m, off, hdrlen, pd->hdr.any); 3230 } 3231 if (pd->proto == IPPROTO_TCP && 3232 ((r->rule_flag & PFRULE_RETURNRST) || 3233 (r->rule_flag & PFRULE_RETURN)) && 3234 !(th->th_flags & TH_RST)) { 3235 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3236 int len = 0; 3237 #ifdef INET 3238 struct ip *h4; 3239 #endif 3240 #ifdef INET6 3241 struct ip6_hdr *h6; 3242 #endif 3243 3244 switch (af) { 3245 #ifdef INET 3246 case AF_INET: 3247 h4 = mtod(m, struct ip *); 3248 len = ntohs(h4->ip_len) - off; 3249 break; 3250 #endif 3251 #ifdef INET6 3252 case AF_INET6: 3253 h6 = mtod(m, struct ip6_hdr *); 3254 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 3255 break; 3256 #endif 3257 } 3258 3259 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 3260 REASON_SET(reason, PFRES_PROTCKSUM); 3261 else { 3262 if (th->th_flags & TH_SYN) 3263 ack++; 3264 if (th->th_flags & TH_FIN) 3265 ack++; 3266 pf_send_tcp(r, af, pd->dst, 3267 pd->src, th->th_dport, th->th_sport, 3268 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3269 r->return_ttl, true, 0, 0, rtableid); 3270 } 3271 } else if (pd->proto == IPPROTO_SCTP && 3272 (r->rule_flag & PFRULE_RETURN)) { 3273 pf_send_sctp_abort(af, pd, r->return_ttl, rtableid); 3274 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3275 r->return_icmp) 3276 pf_send_icmp(m, r->return_icmp >> 8, 3277 r->return_icmp & 255, af, r, rtableid); 3278 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3279 r->return_icmp6) 3280 pf_send_icmp(m, r->return_icmp6 >> 8, 3281 r->return_icmp6 & 255, af, r, rtableid); 3282 } 3283 3284 static int 3285 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m) 3286 { 3287 struct m_tag *mtag; 3288 u_int8_t mpcp; 3289 3290 mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL); 3291 if (mtag == NULL) 3292 return (0); 3293 3294 if (prio == PF_PRIO_ZERO) 3295 prio = 0; 3296 3297 mpcp = *(uint8_t *)(mtag + 1); 3298 3299 return (mpcp == prio); 3300 } 3301 3302 static int 3303 pf_icmp_to_bandlim(uint8_t type) 3304 { 3305 switch (type) { 3306 case ICMP_ECHO: 3307 case ICMP_ECHOREPLY: 3308 return (BANDLIM_ICMP_ECHO); 3309 case ICMP_TSTAMP: 3310 case ICMP_TSTAMPREPLY: 3311 return (BANDLIM_ICMP_TSTAMP); 3312 case ICMP_UNREACH: 3313 default: 3314 return (BANDLIM_ICMP_UNREACH); 3315 } 3316 } 3317 3318 static void 3319 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 3320 struct pf_krule *r, int rtableid) 3321 { 3322 struct pf_send_entry *pfse; 3323 struct mbuf *m0; 3324 struct pf_mtag *pf_mtag; 3325 3326 /* ICMP packet rate limitation. */ 3327 #ifdef INET6 3328 if (af == AF_INET6) { 3329 if (icmp6_ratelimit(NULL, type, code)) 3330 return; 3331 } 3332 #endif 3333 #ifdef INET 3334 if (af == AF_INET) { 3335 if (badport_bandlim(pf_icmp_to_bandlim(type)) != 0) 3336 return; 3337 } 3338 #endif 3339 3340 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3341 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3342 if (pfse == NULL) 3343 return; 3344 3345 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 3346 free(pfse, M_PFTEMP); 3347 return; 3348 } 3349 3350 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 3351 free(pfse, M_PFTEMP); 3352 return; 3353 } 3354 /* XXX: revisit */ 3355 m0->m_flags |= M_SKIP_FIREWALL; 3356 3357 if (rtableid >= 0) 3358 M_SETFIB(m0, rtableid); 3359 3360 #ifdef ALTQ 3361 if (r->qid) { 3362 pf_mtag->qid = r->qid; 3363 /* add hints for ecn */ 3364 pf_mtag->hdr = mtod(m0, struct ip *); 3365 } 3366 #endif /* ALTQ */ 3367 3368 switch (af) { 3369 #ifdef INET 3370 case AF_INET: 3371 pfse->pfse_type = PFSE_ICMP; 3372 break; 3373 #endif /* INET */ 3374 #ifdef INET6 3375 case AF_INET6: 3376 pfse->pfse_type = PFSE_ICMP6; 3377 break; 3378 #endif /* INET6 */ 3379 } 3380 pfse->pfse_m = m0; 3381 pfse->icmpopts.type = type; 3382 pfse->icmpopts.code = code; 3383 pf_send(pfse); 3384 } 3385 3386 /* 3387 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 3388 * If n is 0, they match if they are equal. If n is != 0, they match if they 3389 * are different. 3390 */ 3391 int 3392 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 3393 struct pf_addr *b, sa_family_t af) 3394 { 3395 int match = 0; 3396 3397 switch (af) { 3398 #ifdef INET 3399 case AF_INET: 3400 if ((a->addr32[0] & m->addr32[0]) == 3401 (b->addr32[0] & m->addr32[0])) 3402 match++; 3403 break; 3404 #endif /* INET */ 3405 #ifdef INET6 3406 case AF_INET6: 3407 if (((a->addr32[0] & m->addr32[0]) == 3408 (b->addr32[0] & m->addr32[0])) && 3409 ((a->addr32[1] & m->addr32[1]) == 3410 (b->addr32[1] & m->addr32[1])) && 3411 ((a->addr32[2] & m->addr32[2]) == 3412 (b->addr32[2] & m->addr32[2])) && 3413 ((a->addr32[3] & m->addr32[3]) == 3414 (b->addr32[3] & m->addr32[3]))) 3415 match++; 3416 break; 3417 #endif /* INET6 */ 3418 } 3419 if (match) { 3420 if (n) 3421 return (0); 3422 else 3423 return (1); 3424 } else { 3425 if (n) 3426 return (1); 3427 else 3428 return (0); 3429 } 3430 } 3431 3432 /* 3433 * Return 1 if b <= a <= e, otherwise return 0. 3434 */ 3435 int 3436 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 3437 struct pf_addr *a, sa_family_t af) 3438 { 3439 switch (af) { 3440 #ifdef INET 3441 case AF_INET: 3442 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) || 3443 (ntohl(a->addr32[0]) > ntohl(e->addr32[0]))) 3444 return (0); 3445 break; 3446 #endif /* INET */ 3447 #ifdef INET6 3448 case AF_INET6: { 3449 int i; 3450 3451 /* check a >= b */ 3452 for (i = 0; i < 4; ++i) 3453 if (ntohl(a->addr32[i]) > ntohl(b->addr32[i])) 3454 break; 3455 else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i])) 3456 return (0); 3457 /* check a <= e */ 3458 for (i = 0; i < 4; ++i) 3459 if (ntohl(a->addr32[i]) < ntohl(e->addr32[i])) 3460 break; 3461 else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i])) 3462 return (0); 3463 break; 3464 } 3465 #endif /* INET6 */ 3466 } 3467 return (1); 3468 } 3469 3470 static int 3471 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 3472 { 3473 switch (op) { 3474 case PF_OP_IRG: 3475 return ((p > a1) && (p < a2)); 3476 case PF_OP_XRG: 3477 return ((p < a1) || (p > a2)); 3478 case PF_OP_RRG: 3479 return ((p >= a1) && (p <= a2)); 3480 case PF_OP_EQ: 3481 return (p == a1); 3482 case PF_OP_NE: 3483 return (p != a1); 3484 case PF_OP_LT: 3485 return (p < a1); 3486 case PF_OP_LE: 3487 return (p <= a1); 3488 case PF_OP_GT: 3489 return (p > a1); 3490 case PF_OP_GE: 3491 return (p >= a1); 3492 } 3493 return (0); /* never reached */ 3494 } 3495 3496 int 3497 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 3498 { 3499 NTOHS(a1); 3500 NTOHS(a2); 3501 NTOHS(p); 3502 return (pf_match(op, a1, a2, p)); 3503 } 3504 3505 static int 3506 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 3507 { 3508 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 3509 return (0); 3510 return (pf_match(op, a1, a2, u)); 3511 } 3512 3513 static int 3514 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 3515 { 3516 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 3517 return (0); 3518 return (pf_match(op, a1, a2, g)); 3519 } 3520 3521 int 3522 pf_match_tag(struct mbuf *m, struct pf_krule *r, int *tag, int mtag) 3523 { 3524 if (*tag == -1) 3525 *tag = mtag; 3526 3527 return ((!r->match_tag_not && r->match_tag == *tag) || 3528 (r->match_tag_not && r->match_tag != *tag)); 3529 } 3530 3531 int 3532 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 3533 { 3534 3535 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 3536 3537 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 3538 return (ENOMEM); 3539 3540 pd->pf_mtag->tag = tag; 3541 3542 return (0); 3543 } 3544 3545 #define PF_ANCHOR_STACKSIZE 32 3546 struct pf_kanchor_stackframe { 3547 struct pf_kruleset *rs; 3548 struct pf_krule *r; /* XXX: + match bit */ 3549 struct pf_kanchor *child; 3550 }; 3551 3552 /* 3553 * XXX: We rely on malloc(9) returning pointer aligned addresses. 3554 */ 3555 #define PF_ANCHORSTACK_MATCH 0x00000001 3556 #define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 3557 3558 #define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 3559 #define PF_ANCHOR_RULE(f) (struct pf_krule *) \ 3560 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 3561 #define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 3562 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 3563 } while (0) 3564 3565 void 3566 pf_step_into_anchor(struct pf_kanchor_stackframe *stack, int *depth, 3567 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, 3568 int *match) 3569 { 3570 struct pf_kanchor_stackframe *f; 3571 3572 PF_RULES_RASSERT(); 3573 3574 if (match) 3575 *match = 0; 3576 if (*depth >= PF_ANCHOR_STACKSIZE) { 3577 printf("%s: anchor stack overflow on %s\n", 3578 __func__, (*r)->anchor->name); 3579 *r = TAILQ_NEXT(*r, entries); 3580 return; 3581 } else if (*depth == 0 && a != NULL) 3582 *a = *r; 3583 f = stack + (*depth)++; 3584 f->rs = *rs; 3585 f->r = *r; 3586 if ((*r)->anchor_wildcard) { 3587 struct pf_kanchor_node *parent = &(*r)->anchor->children; 3588 3589 if ((f->child = RB_MIN(pf_kanchor_node, parent)) == NULL) { 3590 *r = NULL; 3591 return; 3592 } 3593 *rs = &f->child->ruleset; 3594 } else { 3595 f->child = NULL; 3596 *rs = &(*r)->anchor->ruleset; 3597 } 3598 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 3599 } 3600 3601 int 3602 pf_step_out_of_anchor(struct pf_kanchor_stackframe *stack, int *depth, 3603 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, 3604 int *match) 3605 { 3606 struct pf_kanchor_stackframe *f; 3607 struct pf_krule *fr; 3608 int quick = 0; 3609 3610 PF_RULES_RASSERT(); 3611 3612 do { 3613 if (*depth <= 0) 3614 break; 3615 f = stack + *depth - 1; 3616 fr = PF_ANCHOR_RULE(f); 3617 if (f->child != NULL) { 3618 /* 3619 * This block traverses through 3620 * a wildcard anchor. 3621 */ 3622 if (match != NULL && *match) { 3623 /* 3624 * If any of "*" matched, then 3625 * "foo/ *" matched, mark frame 3626 * appropriately. 3627 */ 3628 PF_ANCHOR_SET_MATCH(f); 3629 *match = 0; 3630 } 3631 f->child = RB_NEXT(pf_kanchor_node, 3632 &fr->anchor->children, f->child); 3633 if (f->child != NULL) { 3634 *rs = &f->child->ruleset; 3635 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 3636 if (*r == NULL) 3637 continue; 3638 else 3639 break; 3640 } 3641 } 3642 (*depth)--; 3643 if (*depth == 0 && a != NULL) 3644 *a = NULL; 3645 *rs = f->rs; 3646 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 3647 quick = fr->quick; 3648 *r = TAILQ_NEXT(fr, entries); 3649 } while (*r == NULL); 3650 3651 return (quick); 3652 } 3653 3654 struct pf_keth_anchor_stackframe { 3655 struct pf_keth_ruleset *rs; 3656 struct pf_keth_rule *r; /* XXX: + match bit */ 3657 struct pf_keth_anchor *child; 3658 }; 3659 3660 #define PF_ETH_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 3661 #define PF_ETH_ANCHOR_RULE(f) (struct pf_keth_rule *) \ 3662 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 3663 #define PF_ETH_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 3664 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 3665 } while (0) 3666 3667 void 3668 pf_step_into_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth, 3669 struct pf_keth_ruleset **rs, struct pf_keth_rule **r, 3670 struct pf_keth_rule **a, int *match) 3671 { 3672 struct pf_keth_anchor_stackframe *f; 3673 3674 NET_EPOCH_ASSERT(); 3675 3676 if (match) 3677 *match = 0; 3678 if (*depth >= PF_ANCHOR_STACKSIZE) { 3679 printf("%s: anchor stack overflow on %s\n", 3680 __func__, (*r)->anchor->name); 3681 *r = TAILQ_NEXT(*r, entries); 3682 return; 3683 } else if (*depth == 0 && a != NULL) 3684 *a = *r; 3685 f = stack + (*depth)++; 3686 f->rs = *rs; 3687 f->r = *r; 3688 if ((*r)->anchor_wildcard) { 3689 struct pf_keth_anchor_node *parent = &(*r)->anchor->children; 3690 3691 if ((f->child = RB_MIN(pf_keth_anchor_node, parent)) == NULL) { 3692 *r = NULL; 3693 return; 3694 } 3695 *rs = &f->child->ruleset; 3696 } else { 3697 f->child = NULL; 3698 *rs = &(*r)->anchor->ruleset; 3699 } 3700 *r = TAILQ_FIRST((*rs)->active.rules); 3701 } 3702 3703 int 3704 pf_step_out_of_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth, 3705 struct pf_keth_ruleset **rs, struct pf_keth_rule **r, 3706 struct pf_keth_rule **a, int *match) 3707 { 3708 struct pf_keth_anchor_stackframe *f; 3709 struct pf_keth_rule *fr; 3710 int quick = 0; 3711 3712 NET_EPOCH_ASSERT(); 3713 3714 do { 3715 if (*depth <= 0) 3716 break; 3717 f = stack + *depth - 1; 3718 fr = PF_ETH_ANCHOR_RULE(f); 3719 if (f->child != NULL) { 3720 /* 3721 * This block traverses through 3722 * a wildcard anchor. 3723 */ 3724 if (match != NULL && *match) { 3725 /* 3726 * If any of "*" matched, then 3727 * "foo/ *" matched, mark frame 3728 * appropriately. 3729 */ 3730 PF_ETH_ANCHOR_SET_MATCH(f); 3731 *match = 0; 3732 } 3733 f->child = RB_NEXT(pf_keth_anchor_node, 3734 &fr->anchor->children, f->child); 3735 if (f->child != NULL) { 3736 *rs = &f->child->ruleset; 3737 *r = TAILQ_FIRST((*rs)->active.rules); 3738 if (*r == NULL) 3739 continue; 3740 else 3741 break; 3742 } 3743 } 3744 (*depth)--; 3745 if (*depth == 0 && a != NULL) 3746 *a = NULL; 3747 *rs = f->rs; 3748 if (PF_ETH_ANCHOR_MATCH(f) || (match != NULL && *match)) 3749 quick = fr->quick; 3750 *r = TAILQ_NEXT(fr, entries); 3751 } while (*r == NULL); 3752 3753 return (quick); 3754 } 3755 3756 #ifdef INET6 3757 void 3758 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 3759 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 3760 { 3761 switch (af) { 3762 #ifdef INET 3763 case AF_INET: 3764 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3765 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3766 break; 3767 #endif /* INET */ 3768 case AF_INET6: 3769 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3770 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3771 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 3772 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 3773 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 3774 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 3775 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 3776 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 3777 break; 3778 } 3779 } 3780 3781 void 3782 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 3783 { 3784 switch (af) { 3785 #ifdef INET 3786 case AF_INET: 3787 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 3788 break; 3789 #endif /* INET */ 3790 case AF_INET6: 3791 if (addr->addr32[3] == 0xffffffff) { 3792 addr->addr32[3] = 0; 3793 if (addr->addr32[2] == 0xffffffff) { 3794 addr->addr32[2] = 0; 3795 if (addr->addr32[1] == 0xffffffff) { 3796 addr->addr32[1] = 0; 3797 addr->addr32[0] = 3798 htonl(ntohl(addr->addr32[0]) + 1); 3799 } else 3800 addr->addr32[1] = 3801 htonl(ntohl(addr->addr32[1]) + 1); 3802 } else 3803 addr->addr32[2] = 3804 htonl(ntohl(addr->addr32[2]) + 1); 3805 } else 3806 addr->addr32[3] = 3807 htonl(ntohl(addr->addr32[3]) + 1); 3808 break; 3809 } 3810 } 3811 #endif /* INET6 */ 3812 3813 void 3814 pf_rule_to_actions(struct pf_krule *r, struct pf_rule_actions *a) 3815 { 3816 /* 3817 * Modern rules use the same flags in rules as they do in states. 3818 */ 3819 a->flags |= (r->scrub_flags & (PFSTATE_NODF|PFSTATE_RANDOMID| 3820 PFSTATE_SCRUB_TCP|PFSTATE_SETPRIO)); 3821 3822 /* 3823 * Old-style scrub rules have different flags which need to be translated. 3824 */ 3825 if (r->rule_flag & PFRULE_RANDOMID) 3826 a->flags |= PFSTATE_RANDOMID; 3827 if (r->scrub_flags & PFSTATE_SETTOS || r->rule_flag & PFRULE_SET_TOS ) { 3828 a->flags |= PFSTATE_SETTOS; 3829 a->set_tos = r->set_tos; 3830 } 3831 3832 if (r->qid) 3833 a->qid = r->qid; 3834 if (r->pqid) 3835 a->pqid = r->pqid; 3836 if (r->rtableid >= 0) 3837 a->rtableid = r->rtableid; 3838 a->log |= r->log; 3839 if (r->min_ttl) 3840 a->min_ttl = r->min_ttl; 3841 if (r->max_mss) 3842 a->max_mss = r->max_mss; 3843 if (r->dnpipe) 3844 a->dnpipe = r->dnpipe; 3845 if (r->dnrpipe) 3846 a->dnrpipe = r->dnrpipe; 3847 if (r->dnpipe || r->dnrpipe) { 3848 if (r->free_flags & PFRULE_DN_IS_PIPE) 3849 a->flags |= PFSTATE_DN_IS_PIPE; 3850 else 3851 a->flags &= ~PFSTATE_DN_IS_PIPE; 3852 } 3853 if (r->scrub_flags & PFSTATE_SETPRIO) { 3854 a->set_prio[0] = r->set_prio[0]; 3855 a->set_prio[1] = r->set_prio[1]; 3856 } 3857 } 3858 3859 int 3860 pf_socket_lookup(struct pf_pdesc *pd, struct mbuf *m) 3861 { 3862 struct pf_addr *saddr, *daddr; 3863 u_int16_t sport, dport; 3864 struct inpcbinfo *pi; 3865 struct inpcb *inp; 3866 3867 pd->lookup.uid = UID_MAX; 3868 pd->lookup.gid = GID_MAX; 3869 3870 switch (pd->proto) { 3871 case IPPROTO_TCP: 3872 sport = pd->hdr.tcp.th_sport; 3873 dport = pd->hdr.tcp.th_dport; 3874 pi = &V_tcbinfo; 3875 break; 3876 case IPPROTO_UDP: 3877 sport = pd->hdr.udp.uh_sport; 3878 dport = pd->hdr.udp.uh_dport; 3879 pi = &V_udbinfo; 3880 break; 3881 default: 3882 return (-1); 3883 } 3884 if (pd->dir == PF_IN) { 3885 saddr = pd->src; 3886 daddr = pd->dst; 3887 } else { 3888 u_int16_t p; 3889 3890 p = sport; 3891 sport = dport; 3892 dport = p; 3893 saddr = pd->dst; 3894 daddr = pd->src; 3895 } 3896 switch (pd->af) { 3897 #ifdef INET 3898 case AF_INET: 3899 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 3900 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3901 if (inp == NULL) { 3902 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 3903 daddr->v4, dport, INPLOOKUP_WILDCARD | 3904 INPLOOKUP_RLOCKPCB, NULL, m); 3905 if (inp == NULL) 3906 return (-1); 3907 } 3908 break; 3909 #endif /* INET */ 3910 #ifdef INET6 3911 case AF_INET6: 3912 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 3913 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3914 if (inp == NULL) { 3915 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 3916 &daddr->v6, dport, INPLOOKUP_WILDCARD | 3917 INPLOOKUP_RLOCKPCB, NULL, m); 3918 if (inp == NULL) 3919 return (-1); 3920 } 3921 break; 3922 #endif /* INET6 */ 3923 3924 default: 3925 return (-1); 3926 } 3927 INP_RLOCK_ASSERT(inp); 3928 pd->lookup.uid = inp->inp_cred->cr_uid; 3929 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3930 INP_RUNLOCK(inp); 3931 3932 return (1); 3933 } 3934 3935 u_int8_t 3936 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3937 { 3938 int hlen; 3939 u_int8_t hdr[60]; 3940 u_int8_t *opt, optlen; 3941 u_int8_t wscale = 0; 3942 3943 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3944 if (hlen <= sizeof(struct tcphdr)) 3945 return (0); 3946 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3947 return (0); 3948 opt = hdr + sizeof(struct tcphdr); 3949 hlen -= sizeof(struct tcphdr); 3950 while (hlen >= 3) { 3951 switch (*opt) { 3952 case TCPOPT_EOL: 3953 case TCPOPT_NOP: 3954 ++opt; 3955 --hlen; 3956 break; 3957 case TCPOPT_WINDOW: 3958 wscale = opt[2]; 3959 if (wscale > TCP_MAX_WINSHIFT) 3960 wscale = TCP_MAX_WINSHIFT; 3961 wscale |= PF_WSCALE_FLAG; 3962 /* FALLTHROUGH */ 3963 default: 3964 optlen = opt[1]; 3965 if (optlen < 2) 3966 optlen = 2; 3967 hlen -= optlen; 3968 opt += optlen; 3969 break; 3970 } 3971 } 3972 return (wscale); 3973 } 3974 3975 u_int16_t 3976 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3977 { 3978 int hlen; 3979 u_int8_t hdr[60]; 3980 u_int8_t *opt, optlen; 3981 u_int16_t mss = V_tcp_mssdflt; 3982 3983 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3984 if (hlen <= sizeof(struct tcphdr)) 3985 return (0); 3986 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3987 return (0); 3988 opt = hdr + sizeof(struct tcphdr); 3989 hlen -= sizeof(struct tcphdr); 3990 while (hlen >= TCPOLEN_MAXSEG) { 3991 switch (*opt) { 3992 case TCPOPT_EOL: 3993 case TCPOPT_NOP: 3994 ++opt; 3995 --hlen; 3996 break; 3997 case TCPOPT_MAXSEG: 3998 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3999 NTOHS(mss); 4000 /* FALLTHROUGH */ 4001 default: 4002 optlen = opt[1]; 4003 if (optlen < 2) 4004 optlen = 2; 4005 hlen -= optlen; 4006 opt += optlen; 4007 break; 4008 } 4009 } 4010 return (mss); 4011 } 4012 4013 static u_int16_t 4014 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 4015 { 4016 struct nhop_object *nh; 4017 #ifdef INET6 4018 struct in6_addr dst6; 4019 uint32_t scopeid; 4020 #endif /* INET6 */ 4021 int hlen = 0; 4022 uint16_t mss = 0; 4023 4024 NET_EPOCH_ASSERT(); 4025 4026 switch (af) { 4027 #ifdef INET 4028 case AF_INET: 4029 hlen = sizeof(struct ip); 4030 nh = fib4_lookup(rtableid, addr->v4, 0, 0, 0); 4031 if (nh != NULL) 4032 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 4033 break; 4034 #endif /* INET */ 4035 #ifdef INET6 4036 case AF_INET6: 4037 hlen = sizeof(struct ip6_hdr); 4038 in6_splitscope(&addr->v6, &dst6, &scopeid); 4039 nh = fib6_lookup(rtableid, &dst6, scopeid, 0, 0); 4040 if (nh != NULL) 4041 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 4042 break; 4043 #endif /* INET6 */ 4044 } 4045 4046 mss = max(V_tcp_mssdflt, mss); 4047 mss = min(mss, offer); 4048 mss = max(mss, 64); /* sanity - at least max opt space */ 4049 return (mss); 4050 } 4051 4052 static u_int32_t 4053 pf_tcp_iss(struct pf_pdesc *pd) 4054 { 4055 MD5_CTX ctx; 4056 u_int32_t digest[4]; 4057 4058 if (V_pf_tcp_secret_init == 0) { 4059 arc4random_buf(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 4060 MD5Init(&V_pf_tcp_secret_ctx); 4061 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 4062 sizeof(V_pf_tcp_secret)); 4063 V_pf_tcp_secret_init = 1; 4064 } 4065 4066 ctx = V_pf_tcp_secret_ctx; 4067 4068 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_sport, sizeof(u_short)); 4069 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_dport, sizeof(u_short)); 4070 if (pd->af == AF_INET6) { 4071 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 4072 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 4073 } else { 4074 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 4075 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 4076 } 4077 MD5Final((u_char *)digest, &ctx); 4078 V_pf_tcp_iss_off += 4096; 4079 #define ISN_RANDOM_INCREMENT (4096 - 1) 4080 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 4081 V_pf_tcp_iss_off); 4082 #undef ISN_RANDOM_INCREMENT 4083 } 4084 4085 static bool 4086 pf_match_eth_addr(const uint8_t *a, const struct pf_keth_rule_addr *r) 4087 { 4088 bool match = true; 4089 4090 /* Always matches if not set */ 4091 if (! r->isset) 4092 return (!r->neg); 4093 4094 for (int i = 0; i < ETHER_ADDR_LEN; i++) { 4095 if ((a[i] & r->mask[i]) != (r->addr[i] & r->mask[i])) { 4096 match = false; 4097 break; 4098 } 4099 } 4100 4101 return (match ^ r->neg); 4102 } 4103 4104 static int 4105 pf_match_eth_tag(struct mbuf *m, struct pf_keth_rule *r, int *tag, int mtag) 4106 { 4107 if (*tag == -1) 4108 *tag = mtag; 4109 4110 return ((!r->match_tag_not && r->match_tag == *tag) || 4111 (r->match_tag_not && r->match_tag != *tag)); 4112 } 4113 4114 static void 4115 pf_bridge_to(struct ifnet *ifp, struct mbuf *m) 4116 { 4117 /* If we don't have the interface drop the packet. */ 4118 if (ifp == NULL) { 4119 m_freem(m); 4120 return; 4121 } 4122 4123 switch (ifp->if_type) { 4124 case IFT_ETHER: 4125 case IFT_XETHER: 4126 case IFT_L2VLAN: 4127 case IFT_BRIDGE: 4128 case IFT_IEEE8023ADLAG: 4129 break; 4130 default: 4131 m_freem(m); 4132 return; 4133 } 4134 4135 ifp->if_transmit(ifp, m); 4136 } 4137 4138 static int 4139 pf_test_eth_rule(int dir, struct pfi_kkif *kif, struct mbuf **m0) 4140 { 4141 #ifdef INET 4142 struct ip ip; 4143 #endif 4144 #ifdef INET6 4145 struct ip6_hdr ip6; 4146 #endif 4147 struct mbuf *m = *m0; 4148 struct ether_header *e; 4149 struct pf_keth_rule *r, *rm, *a = NULL; 4150 struct pf_keth_ruleset *ruleset = NULL; 4151 struct pf_mtag *mtag; 4152 struct pf_keth_ruleq *rules; 4153 struct pf_addr *src = NULL, *dst = NULL; 4154 struct pfi_kkif *bridge_to; 4155 sa_family_t af = 0; 4156 uint16_t proto; 4157 int asd = 0, match = 0; 4158 int tag = -1; 4159 uint8_t action; 4160 struct pf_keth_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 4161 4162 MPASS(kif->pfik_ifp->if_vnet == curvnet); 4163 NET_EPOCH_ASSERT(); 4164 4165 PF_RULES_RLOCK_TRACKER; 4166 4167 SDT_PROBE3(pf, eth, test_rule, entry, dir, kif->pfik_ifp, m); 4168 4169 mtag = pf_find_mtag(m); 4170 if (mtag != NULL && mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 4171 /* Dummynet re-injects packets after they've 4172 * completed their delay. We've already 4173 * processed them, so pass unconditionally. */ 4174 4175 /* But only once. We may see the packet multiple times (e.g. 4176 * PFIL_IN/PFIL_OUT). */ 4177 pf_dummynet_flag_remove(m, mtag); 4178 4179 return (PF_PASS); 4180 } 4181 4182 ruleset = V_pf_keth; 4183 rules = ck_pr_load_ptr(&ruleset->active.rules); 4184 r = TAILQ_FIRST(rules); 4185 rm = NULL; 4186 4187 e = mtod(m, struct ether_header *); 4188 proto = ntohs(e->ether_type); 4189 4190 switch (proto) { 4191 #ifdef INET 4192 case ETHERTYPE_IP: { 4193 if (m_length(m, NULL) < (sizeof(struct ether_header) + 4194 sizeof(ip))) 4195 return (PF_DROP); 4196 4197 af = AF_INET; 4198 m_copydata(m, sizeof(struct ether_header), sizeof(ip), 4199 (caddr_t)&ip); 4200 src = (struct pf_addr *)&ip.ip_src; 4201 dst = (struct pf_addr *)&ip.ip_dst; 4202 break; 4203 } 4204 #endif /* INET */ 4205 #ifdef INET6 4206 case ETHERTYPE_IPV6: { 4207 if (m_length(m, NULL) < (sizeof(struct ether_header) + 4208 sizeof(ip6))) 4209 return (PF_DROP); 4210 4211 af = AF_INET6; 4212 m_copydata(m, sizeof(struct ether_header), sizeof(ip6), 4213 (caddr_t)&ip6); 4214 src = (struct pf_addr *)&ip6.ip6_src; 4215 dst = (struct pf_addr *)&ip6.ip6_dst; 4216 break; 4217 } 4218 #endif /* INET6 */ 4219 } 4220 4221 PF_RULES_RLOCK(); 4222 4223 while (r != NULL) { 4224 counter_u64_add(r->evaluations, 1); 4225 SDT_PROBE2(pf, eth, test_rule, test, r->nr, r); 4226 4227 if (pfi_kkif_match(r->kif, kif) == r->ifnot) { 4228 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4229 "kif"); 4230 r = r->skip[PFE_SKIP_IFP].ptr; 4231 } 4232 else if (r->direction && r->direction != dir) { 4233 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4234 "dir"); 4235 r = r->skip[PFE_SKIP_DIR].ptr; 4236 } 4237 else if (r->proto && r->proto != proto) { 4238 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4239 "proto"); 4240 r = r->skip[PFE_SKIP_PROTO].ptr; 4241 } 4242 else if (! pf_match_eth_addr(e->ether_shost, &r->src)) { 4243 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4244 "src"); 4245 r = r->skip[PFE_SKIP_SRC_ADDR].ptr; 4246 } 4247 else if (! pf_match_eth_addr(e->ether_dhost, &r->dst)) { 4248 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4249 "dst"); 4250 r = r->skip[PFE_SKIP_DST_ADDR].ptr; 4251 } 4252 else if (src != NULL && PF_MISMATCHAW(&r->ipsrc.addr, src, af, 4253 r->ipsrc.neg, kif, M_GETFIB(m))) { 4254 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4255 "ip_src"); 4256 r = r->skip[PFE_SKIP_SRC_IP_ADDR].ptr; 4257 } 4258 else if (dst != NULL && PF_MISMATCHAW(&r->ipdst.addr, dst, af, 4259 r->ipdst.neg, kif, M_GETFIB(m))) { 4260 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4261 "ip_dst"); 4262 r = r->skip[PFE_SKIP_DST_IP_ADDR].ptr; 4263 } 4264 else if (r->match_tag && !pf_match_eth_tag(m, r, &tag, 4265 mtag ? mtag->tag : 0)) { 4266 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r, 4267 "match_tag"); 4268 r = TAILQ_NEXT(r, entries); 4269 } 4270 else { 4271 if (r->tag) 4272 tag = r->tag; 4273 if (r->anchor == NULL) { 4274 /* Rule matches */ 4275 rm = r; 4276 4277 SDT_PROBE2(pf, eth, test_rule, match, r->nr, r); 4278 4279 if (r->quick) 4280 break; 4281 4282 r = TAILQ_NEXT(r, entries); 4283 } else { 4284 pf_step_into_keth_anchor(anchor_stack, &asd, 4285 &ruleset, &r, &a, &match); 4286 } 4287 } 4288 if (r == NULL && pf_step_out_of_keth_anchor(anchor_stack, &asd, 4289 &ruleset, &r, &a, &match)) 4290 break; 4291 } 4292 4293 r = rm; 4294 4295 SDT_PROBE2(pf, eth, test_rule, final_match, (r != NULL ? r->nr : -1), r); 4296 4297 /* Default to pass. */ 4298 if (r == NULL) { 4299 PF_RULES_RUNLOCK(); 4300 return (PF_PASS); 4301 } 4302 4303 /* Execute action. */ 4304 counter_u64_add(r->packets[dir == PF_OUT], 1); 4305 counter_u64_add(r->bytes[dir == PF_OUT], m_length(m, NULL)); 4306 pf_update_timestamp(r); 4307 4308 /* Shortcut. Don't tag if we're just going to drop anyway. */ 4309 if (r->action == PF_DROP) { 4310 PF_RULES_RUNLOCK(); 4311 return (PF_DROP); 4312 } 4313 4314 if (tag > 0) { 4315 if (mtag == NULL) 4316 mtag = pf_get_mtag(m); 4317 if (mtag == NULL) { 4318 PF_RULES_RUNLOCK(); 4319 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4320 return (PF_DROP); 4321 } 4322 mtag->tag = tag; 4323 } 4324 4325 if (r->qid != 0) { 4326 if (mtag == NULL) 4327 mtag = pf_get_mtag(m); 4328 if (mtag == NULL) { 4329 PF_RULES_RUNLOCK(); 4330 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4331 return (PF_DROP); 4332 } 4333 mtag->qid = r->qid; 4334 } 4335 4336 action = r->action; 4337 bridge_to = r->bridge_to; 4338 4339 /* Dummynet */ 4340 if (r->dnpipe) { 4341 struct ip_fw_args dnflow; 4342 4343 /* Drop packet if dummynet is not loaded. */ 4344 if (ip_dn_io_ptr == NULL) { 4345 PF_RULES_RUNLOCK(); 4346 m_freem(m); 4347 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4348 return (PF_DROP); 4349 } 4350 if (mtag == NULL) 4351 mtag = pf_get_mtag(m); 4352 if (mtag == NULL) { 4353 PF_RULES_RUNLOCK(); 4354 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1); 4355 return (PF_DROP); 4356 } 4357 4358 bzero(&dnflow, sizeof(dnflow)); 4359 4360 /* We don't have port numbers here, so we set 0. That means 4361 * that we'll be somewhat limited in distinguishing flows (i.e. 4362 * only based on IP addresses, not based on port numbers), but 4363 * it's better than nothing. */ 4364 dnflow.f_id.dst_port = 0; 4365 dnflow.f_id.src_port = 0; 4366 dnflow.f_id.proto = 0; 4367 4368 dnflow.rule.info = r->dnpipe; 4369 dnflow.rule.info |= IPFW_IS_DUMMYNET; 4370 if (r->dnflags & PFRULE_DN_IS_PIPE) 4371 dnflow.rule.info |= IPFW_IS_PIPE; 4372 4373 dnflow.f_id.extra = dnflow.rule.info; 4374 4375 dnflow.flags = dir == PF_IN ? IPFW_ARGS_IN : IPFW_ARGS_OUT; 4376 dnflow.flags |= IPFW_ARGS_ETHER; 4377 dnflow.ifp = kif->pfik_ifp; 4378 4379 switch (af) { 4380 case AF_INET: 4381 dnflow.f_id.addr_type = 4; 4382 dnflow.f_id.src_ip = src->v4.s_addr; 4383 dnflow.f_id.dst_ip = dst->v4.s_addr; 4384 break; 4385 case AF_INET6: 4386 dnflow.flags |= IPFW_ARGS_IP6; 4387 dnflow.f_id.addr_type = 6; 4388 dnflow.f_id.src_ip6 = src->v6; 4389 dnflow.f_id.dst_ip6 = dst->v6; 4390 break; 4391 } 4392 4393 PF_RULES_RUNLOCK(); 4394 4395 mtag->flags |= PF_MTAG_FLAG_DUMMYNET; 4396 ip_dn_io_ptr(m0, &dnflow); 4397 if (*m0 != NULL) 4398 pf_dummynet_flag_remove(m, mtag); 4399 } else { 4400 PF_RULES_RUNLOCK(); 4401 } 4402 4403 if (action == PF_PASS && bridge_to) { 4404 pf_bridge_to(bridge_to->pfik_ifp, *m0); 4405 *m0 = NULL; /* We've eaten the packet. */ 4406 } 4407 4408 return (action); 4409 } 4410 4411 static int 4412 pf_test_rule(struct pf_krule **rm, struct pf_kstate **sm, struct pfi_kkif *kif, 4413 struct mbuf *m, int off, struct pf_pdesc *pd, struct pf_krule **am, 4414 struct pf_kruleset **rsm, struct inpcb *inp) 4415 { 4416 struct pf_krule *nr = NULL; 4417 struct pf_addr * const saddr = pd->src; 4418 struct pf_addr * const daddr = pd->dst; 4419 sa_family_t af = pd->af; 4420 struct pf_krule *r, *a = NULL; 4421 struct pf_kruleset *ruleset = NULL; 4422 struct pf_krule_slist match_rules; 4423 struct pf_krule_item *ri; 4424 struct pf_ksrc_node *nsn = NULL; 4425 struct tcphdr *th = &pd->hdr.tcp; 4426 struct pf_state_key *sk = NULL, *nk = NULL; 4427 u_short reason; 4428 int rewrite = 0, hdrlen = 0; 4429 int tag = -1; 4430 int asd = 0; 4431 int match = 0; 4432 int state_icmp = 0; 4433 u_int16_t sport = 0, dport = 0; 4434 u_int16_t bproto_sum = 0, bip_sum = 0; 4435 u_int8_t icmptype = 0, icmpcode = 0; 4436 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 4437 4438 PF_RULES_RASSERT(); 4439 4440 if (inp != NULL) { 4441 INP_LOCK_ASSERT(inp); 4442 pd->lookup.uid = inp->inp_cred->cr_uid; 4443 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 4444 pd->lookup.done = 1; 4445 } 4446 4447 switch (pd->proto) { 4448 case IPPROTO_TCP: 4449 sport = th->th_sport; 4450 dport = th->th_dport; 4451 hdrlen = sizeof(*th); 4452 break; 4453 case IPPROTO_UDP: 4454 sport = pd->hdr.udp.uh_sport; 4455 dport = pd->hdr.udp.uh_dport; 4456 hdrlen = sizeof(pd->hdr.udp); 4457 break; 4458 case IPPROTO_SCTP: 4459 sport = pd->hdr.sctp.src_port; 4460 dport = pd->hdr.sctp.dest_port; 4461 hdrlen = sizeof(pd->hdr.sctp); 4462 break; 4463 #ifdef INET 4464 case IPPROTO_ICMP: 4465 if (pd->af != AF_INET) 4466 break; 4467 sport = dport = pd->hdr.icmp.icmp_id; 4468 hdrlen = sizeof(pd->hdr.icmp); 4469 icmptype = pd->hdr.icmp.icmp_type; 4470 icmpcode = pd->hdr.icmp.icmp_code; 4471 4472 if (icmptype == ICMP_UNREACH || 4473 icmptype == ICMP_SOURCEQUENCH || 4474 icmptype == ICMP_REDIRECT || 4475 icmptype == ICMP_TIMXCEED || 4476 icmptype == ICMP_PARAMPROB) 4477 state_icmp++; 4478 break; 4479 #endif /* INET */ 4480 #ifdef INET6 4481 case IPPROTO_ICMPV6: 4482 if (af != AF_INET6) 4483 break; 4484 sport = dport = pd->hdr.icmp6.icmp6_id; 4485 hdrlen = sizeof(pd->hdr.icmp6); 4486 icmptype = pd->hdr.icmp6.icmp6_type; 4487 icmpcode = pd->hdr.icmp6.icmp6_code; 4488 4489 if (icmptype == ICMP6_DST_UNREACH || 4490 icmptype == ICMP6_PACKET_TOO_BIG || 4491 icmptype == ICMP6_TIME_EXCEEDED || 4492 icmptype == ICMP6_PARAM_PROB) 4493 state_icmp++; 4494 break; 4495 #endif /* INET6 */ 4496 default: 4497 sport = dport = hdrlen = 0; 4498 break; 4499 } 4500 4501 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4502 4503 /* check packet for BINAT/NAT/RDR */ 4504 if ((nr = pf_get_translation(pd, m, off, kif, &nsn, &sk, 4505 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 4506 KASSERT(sk != NULL, ("%s: null sk", __func__)); 4507 KASSERT(nk != NULL, ("%s: null nk", __func__)); 4508 4509 if (nr->log) { 4510 PFLOG_PACKET(kif, m, af, PF_PASS, PFRES_MATCH, nr, a, 4511 ruleset, pd, 1); 4512 } 4513 4514 if (pd->ip_sum) 4515 bip_sum = *pd->ip_sum; 4516 4517 switch (pd->proto) { 4518 case IPPROTO_TCP: 4519 bproto_sum = th->th_sum; 4520 pd->proto_sum = &th->th_sum; 4521 4522 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4523 nk->port[pd->sidx] != sport) { 4524 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum, 4525 &th->th_sum, &nk->addr[pd->sidx], 4526 nk->port[pd->sidx], 0, af); 4527 pd->sport = &th->th_sport; 4528 sport = th->th_sport; 4529 } 4530 4531 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4532 nk->port[pd->didx] != dport) { 4533 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum, 4534 &th->th_sum, &nk->addr[pd->didx], 4535 nk->port[pd->didx], 0, af); 4536 dport = th->th_dport; 4537 pd->dport = &th->th_dport; 4538 } 4539 rewrite++; 4540 break; 4541 case IPPROTO_UDP: 4542 bproto_sum = pd->hdr.udp.uh_sum; 4543 pd->proto_sum = &pd->hdr.udp.uh_sum; 4544 4545 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4546 nk->port[pd->sidx] != sport) { 4547 pf_change_ap(m, saddr, &pd->hdr.udp.uh_sport, 4548 pd->ip_sum, &pd->hdr.udp.uh_sum, 4549 &nk->addr[pd->sidx], 4550 nk->port[pd->sidx], 1, af); 4551 sport = pd->hdr.udp.uh_sport; 4552 pd->sport = &pd->hdr.udp.uh_sport; 4553 } 4554 4555 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4556 nk->port[pd->didx] != dport) { 4557 pf_change_ap(m, daddr, &pd->hdr.udp.uh_dport, 4558 pd->ip_sum, &pd->hdr.udp.uh_sum, 4559 &nk->addr[pd->didx], 4560 nk->port[pd->didx], 1, af); 4561 dport = pd->hdr.udp.uh_dport; 4562 pd->dport = &pd->hdr.udp.uh_dport; 4563 } 4564 rewrite++; 4565 break; 4566 case IPPROTO_SCTP: { 4567 uint16_t checksum = 0; 4568 4569 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 4570 nk->port[pd->sidx] != sport) { 4571 pf_change_ap(m, saddr, &pd->hdr.sctp.src_port, 4572 pd->ip_sum, &checksum, 4573 &nk->addr[pd->sidx], 4574 nk->port[pd->sidx], 1, af); 4575 } 4576 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 4577 nk->port[pd->didx] != dport) { 4578 pf_change_ap(m, daddr, &pd->hdr.sctp.dest_port, 4579 pd->ip_sum, &checksum, 4580 &nk->addr[pd->didx], 4581 nk->port[pd->didx], 1, af); 4582 } 4583 break; 4584 } 4585 #ifdef INET 4586 case IPPROTO_ICMP: 4587 nk->port[0] = nk->port[1]; 4588 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 4589 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4590 nk->addr[pd->sidx].v4.s_addr, 0); 4591 4592 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 4593 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 4594 nk->addr[pd->didx].v4.s_addr, 0); 4595 4596 if (nk->port[1] != pd->hdr.icmp.icmp_id) { 4597 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( 4598 pd->hdr.icmp.icmp_cksum, sport, 4599 nk->port[1], 0); 4600 pd->hdr.icmp.icmp_id = nk->port[1]; 4601 pd->sport = &pd->hdr.icmp.icmp_id; 4602 } 4603 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); 4604 break; 4605 #endif /* INET */ 4606 #ifdef INET6 4607 case IPPROTO_ICMPV6: 4608 nk->port[0] = nk->port[1]; 4609 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 4610 pf_change_a6(saddr, &pd->hdr.icmp6.icmp6_cksum, 4611 &nk->addr[pd->sidx], 0); 4612 4613 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 4614 pf_change_a6(daddr, &pd->hdr.icmp6.icmp6_cksum, 4615 &nk->addr[pd->didx], 0); 4616 rewrite++; 4617 break; 4618 #endif /* INET */ 4619 default: 4620 switch (af) { 4621 #ifdef INET 4622 case AF_INET: 4623 if (PF_ANEQ(saddr, 4624 &nk->addr[pd->sidx], AF_INET)) 4625 pf_change_a(&saddr->v4.s_addr, 4626 pd->ip_sum, 4627 nk->addr[pd->sidx].v4.s_addr, 0); 4628 4629 if (PF_ANEQ(daddr, 4630 &nk->addr[pd->didx], AF_INET)) 4631 pf_change_a(&daddr->v4.s_addr, 4632 pd->ip_sum, 4633 nk->addr[pd->didx].v4.s_addr, 0); 4634 break; 4635 #endif /* INET */ 4636 #ifdef INET6 4637 case AF_INET6: 4638 if (PF_ANEQ(saddr, 4639 &nk->addr[pd->sidx], AF_INET6)) 4640 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 4641 4642 if (PF_ANEQ(daddr, 4643 &nk->addr[pd->didx], AF_INET6)) 4644 PF_ACPY(daddr, &nk->addr[pd->didx], af); 4645 break; 4646 #endif /* INET */ 4647 } 4648 break; 4649 } 4650 if (nr->natpass) 4651 r = NULL; 4652 pd->nat_rule = nr; 4653 } 4654 4655 SLIST_INIT(&match_rules); 4656 while (r != NULL) { 4657 pf_counter_u64_add(&r->evaluations, 1); 4658 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 4659 r = r->skip[PF_SKIP_IFP].ptr; 4660 else if (r->direction && r->direction != pd->dir) 4661 r = r->skip[PF_SKIP_DIR].ptr; 4662 else if (r->af && r->af != af) 4663 r = r->skip[PF_SKIP_AF].ptr; 4664 else if (r->proto && r->proto != pd->proto) 4665 r = r->skip[PF_SKIP_PROTO].ptr; 4666 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 4667 r->src.neg, kif, M_GETFIB(m))) 4668 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4669 /* tcp/udp only. port_op always 0 in other cases */ 4670 else if (r->src.port_op && !pf_match_port(r->src.port_op, 4671 r->src.port[0], r->src.port[1], sport)) 4672 r = r->skip[PF_SKIP_SRC_PORT].ptr; 4673 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 4674 r->dst.neg, NULL, M_GETFIB(m))) 4675 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4676 /* tcp/udp only. port_op always 0 in other cases */ 4677 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 4678 r->dst.port[0], r->dst.port[1], dport)) 4679 r = r->skip[PF_SKIP_DST_PORT].ptr; 4680 /* icmp only. type always 0 in other cases */ 4681 else if (r->type && r->type != icmptype + 1) 4682 r = TAILQ_NEXT(r, entries); 4683 /* icmp only. type always 0 in other cases */ 4684 else if (r->code && r->code != icmpcode + 1) 4685 r = TAILQ_NEXT(r, entries); 4686 else if (r->tos && !(r->tos == pd->tos)) 4687 r = TAILQ_NEXT(r, entries); 4688 else if (r->rule_flag & PFRULE_FRAGMENT) 4689 r = TAILQ_NEXT(r, entries); 4690 else if (pd->proto == IPPROTO_TCP && 4691 (r->flagset & th->th_flags) != r->flags) 4692 r = TAILQ_NEXT(r, entries); 4693 /* tcp/udp only. uid.op always 0 in other cases */ 4694 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 4695 pf_socket_lookup(pd, m), 1)) && 4696 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 4697 pd->lookup.uid)) 4698 r = TAILQ_NEXT(r, entries); 4699 /* tcp/udp only. gid.op always 0 in other cases */ 4700 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 4701 pf_socket_lookup(pd, m), 1)) && 4702 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 4703 pd->lookup.gid)) 4704 r = TAILQ_NEXT(r, entries); 4705 else if (r->prio && 4706 !pf_match_ieee8021q_pcp(r->prio, m)) 4707 r = TAILQ_NEXT(r, entries); 4708 else if (r->prob && 4709 r->prob <= arc4random()) 4710 r = TAILQ_NEXT(r, entries); 4711 else if (r->match_tag && !pf_match_tag(m, r, &tag, 4712 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 4713 r = TAILQ_NEXT(r, entries); 4714 else if (r->os_fingerprint != PF_OSFP_ANY && 4715 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 4716 pf_osfp_fingerprint(pd, m, off, th), 4717 r->os_fingerprint))) 4718 r = TAILQ_NEXT(r, entries); 4719 else { 4720 if (r->tag) 4721 tag = r->tag; 4722 if (r->anchor == NULL) { 4723 if (r->action == PF_MATCH) { 4724 ri = malloc(sizeof(struct pf_krule_item), M_PF_RULE_ITEM, M_NOWAIT | M_ZERO); 4725 if (ri == NULL) { 4726 REASON_SET(&reason, PFRES_MEMORY); 4727 goto cleanup; 4728 } 4729 ri->r = r; 4730 SLIST_INSERT_HEAD(&match_rules, ri, entry); 4731 pf_counter_u64_critical_enter(); 4732 pf_counter_u64_add_protected(&r->packets[pd->dir == PF_OUT], 1); 4733 pf_counter_u64_add_protected(&r->bytes[pd->dir == PF_OUT], pd->tot_len); 4734 pf_counter_u64_critical_exit(); 4735 pf_rule_to_actions(r, &pd->act); 4736 if (r->log) 4737 PFLOG_PACKET(kif, m, af, 4738 r->action, PFRES_MATCH, r, 4739 a, ruleset, pd, 1); 4740 } else { 4741 match = 1; 4742 *rm = r; 4743 *am = a; 4744 *rsm = ruleset; 4745 } 4746 if ((*rm)->quick) 4747 break; 4748 r = TAILQ_NEXT(r, entries); 4749 } else 4750 pf_step_into_anchor(anchor_stack, &asd, 4751 &ruleset, PF_RULESET_FILTER, &r, &a, 4752 &match); 4753 } 4754 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 4755 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 4756 break; 4757 } 4758 r = *rm; 4759 a = *am; 4760 ruleset = *rsm; 4761 4762 REASON_SET(&reason, PFRES_MATCH); 4763 4764 /* apply actions for last matching pass/block rule */ 4765 pf_rule_to_actions(r, &pd->act); 4766 4767 if (r->log) { 4768 if (rewrite) 4769 m_copyback(m, off, hdrlen, pd->hdr.any); 4770 PFLOG_PACKET(kif, m, af, r->action, reason, r, a, ruleset, pd, 1); 4771 } 4772 4773 if ((r->action == PF_DROP) && 4774 ((r->rule_flag & PFRULE_RETURNRST) || 4775 (r->rule_flag & PFRULE_RETURNICMP) || 4776 (r->rule_flag & PFRULE_RETURN))) { 4777 pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum, 4778 bip_sum, hdrlen, &reason, r->rtableid); 4779 } 4780 4781 if (r->action == PF_DROP) 4782 goto cleanup; 4783 4784 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 4785 REASON_SET(&reason, PFRES_MEMORY); 4786 goto cleanup; 4787 } 4788 if (pd->act.rtableid >= 0) 4789 M_SETFIB(m, pd->act.rtableid); 4790 4791 if (!state_icmp && (r->keep_state || nr != NULL || 4792 (pd->flags & PFDESC_TCP_NORM))) { 4793 int action; 4794 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 4795 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 4796 hdrlen, &match_rules); 4797 if (action != PF_PASS) { 4798 if (action == PF_DROP && 4799 (r->rule_flag & PFRULE_RETURN)) 4800 pf_return(r, nr, pd, sk, off, m, th, kif, 4801 bproto_sum, bip_sum, hdrlen, &reason, 4802 pd->act.rtableid); 4803 return (action); 4804 } 4805 } else { 4806 while ((ri = SLIST_FIRST(&match_rules))) { 4807 SLIST_REMOVE_HEAD(&match_rules, entry); 4808 free(ri, M_PF_RULE_ITEM); 4809 } 4810 4811 uma_zfree(V_pf_state_key_z, sk); 4812 uma_zfree(V_pf_state_key_z, nk); 4813 } 4814 4815 /* copy back packet headers if we performed NAT operations */ 4816 if (rewrite) 4817 m_copyback(m, off, hdrlen, pd->hdr.any); 4818 4819 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 4820 pd->dir == PF_OUT && 4821 V_pfsync_defer_ptr != NULL && V_pfsync_defer_ptr(*sm, m)) 4822 /* 4823 * We want the state created, but we dont 4824 * want to send this in case a partner 4825 * firewall has to know about it to allow 4826 * replies through it. 4827 */ 4828 return (PF_DEFER); 4829 4830 return (PF_PASS); 4831 4832 cleanup: 4833 while ((ri = SLIST_FIRST(&match_rules))) { 4834 SLIST_REMOVE_HEAD(&match_rules, entry); 4835 free(ri, M_PF_RULE_ITEM); 4836 } 4837 4838 uma_zfree(V_pf_state_key_z, sk); 4839 uma_zfree(V_pf_state_key_z, nk); 4840 return (PF_DROP); 4841 } 4842 4843 static int 4844 pf_create_state(struct pf_krule *r, struct pf_krule *nr, struct pf_krule *a, 4845 struct pf_pdesc *pd, struct pf_ksrc_node *nsn, struct pf_state_key *nk, 4846 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 4847 u_int16_t dport, int *rewrite, struct pfi_kkif *kif, struct pf_kstate **sm, 4848 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen, 4849 struct pf_krule_slist *match_rules) 4850 { 4851 struct pf_kstate *s = NULL; 4852 struct pf_ksrc_node *sn = NULL; 4853 struct tcphdr *th = &pd->hdr.tcp; 4854 u_int16_t mss = V_tcp_mssdflt; 4855 u_short reason, sn_reason; 4856 struct pf_krule_item *ri; 4857 4858 /* check maximums */ 4859 if (r->max_states && 4860 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 4861 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 4862 REASON_SET(&reason, PFRES_MAXSTATES); 4863 goto csfailed; 4864 } 4865 /* src node for filter rule */ 4866 if ((r->rule_flag & PFRULE_SRCTRACK || 4867 r->rpool.opts & PF_POOL_STICKYADDR) && 4868 (sn_reason = pf_insert_src_node(&sn, r, pd->src, pd->af)) != 0) { 4869 REASON_SET(&reason, sn_reason); 4870 goto csfailed; 4871 } 4872 /* src node for translation rule */ 4873 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4874 (sn_reason = pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], 4875 pd->af)) != 0 ) { 4876 REASON_SET(&reason, sn_reason); 4877 goto csfailed; 4878 } 4879 s = pf_alloc_state(M_NOWAIT); 4880 if (s == NULL) { 4881 REASON_SET(&reason, PFRES_MEMORY); 4882 goto csfailed; 4883 } 4884 s->rule.ptr = r; 4885 s->nat_rule.ptr = nr; 4886 s->anchor.ptr = a; 4887 bcopy(match_rules, &s->match_rules, sizeof(s->match_rules)); 4888 memcpy(&s->act, &pd->act, sizeof(struct pf_rule_actions)); 4889 4890 STATE_INC_COUNTERS(s); 4891 if (r->allow_opts) 4892 s->state_flags |= PFSTATE_ALLOWOPTS; 4893 if (r->rule_flag & PFRULE_STATESLOPPY) 4894 s->state_flags |= PFSTATE_SLOPPY; 4895 if (pd->flags & PFDESC_TCP_NORM) /* Set by old-style scrub rules */ 4896 s->state_flags |= PFSTATE_SCRUB_TCP; 4897 if ((r->rule_flag & PFRULE_PFLOW) || 4898 (nr != NULL && nr->rule_flag & PFRULE_PFLOW)) 4899 s->state_flags |= PFSTATE_PFLOW; 4900 4901 s->act.log = pd->act.log & PF_LOG_ALL; 4902 s->sync_state = PFSYNC_S_NONE; 4903 s->state_flags |= pd->act.flags; /* Only needed for pfsync and state export */ 4904 4905 if (nr != NULL) 4906 s->act.log |= nr->log & PF_LOG_ALL; 4907 switch (pd->proto) { 4908 case IPPROTO_TCP: 4909 s->src.seqlo = ntohl(th->th_seq); 4910 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 4911 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 4912 r->keep_state == PF_STATE_MODULATE) { 4913 /* Generate sequence number modulator */ 4914 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 4915 0) 4916 s->src.seqdiff = 1; 4917 pf_change_proto_a(m, &th->th_seq, &th->th_sum, 4918 htonl(s->src.seqlo + s->src.seqdiff), 0); 4919 *rewrite = 1; 4920 } else 4921 s->src.seqdiff = 0; 4922 if (th->th_flags & TH_SYN) { 4923 s->src.seqhi++; 4924 s->src.wscale = pf_get_wscale(m, off, 4925 th->th_off, pd->af); 4926 } 4927 s->src.max_win = MAX(ntohs(th->th_win), 1); 4928 if (s->src.wscale & PF_WSCALE_MASK) { 4929 /* Remove scale factor from initial window */ 4930 int win = s->src.max_win; 4931 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 4932 s->src.max_win = (win - 1) >> 4933 (s->src.wscale & PF_WSCALE_MASK); 4934 } 4935 if (th->th_flags & TH_FIN) 4936 s->src.seqhi++; 4937 s->dst.seqhi = 1; 4938 s->dst.max_win = 1; 4939 pf_set_protostate(s, PF_PEER_SRC, TCPS_SYN_SENT); 4940 pf_set_protostate(s, PF_PEER_DST, TCPS_CLOSED); 4941 s->timeout = PFTM_TCP_FIRST_PACKET; 4942 atomic_add_32(&V_pf_status.states_halfopen, 1); 4943 break; 4944 case IPPROTO_UDP: 4945 pf_set_protostate(s, PF_PEER_SRC, PFUDPS_SINGLE); 4946 pf_set_protostate(s, PF_PEER_DST, PFUDPS_NO_TRAFFIC); 4947 s->timeout = PFTM_UDP_FIRST_PACKET; 4948 break; 4949 case IPPROTO_SCTP: 4950 pf_set_protostate(s, PF_PEER_SRC, SCTP_COOKIE_WAIT); 4951 pf_set_protostate(s, PF_PEER_DST, SCTP_CLOSED); 4952 s->timeout = PFTM_SCTP_FIRST_PACKET; 4953 break; 4954 case IPPROTO_ICMP: 4955 #ifdef INET6 4956 case IPPROTO_ICMPV6: 4957 #endif 4958 s->timeout = PFTM_ICMP_FIRST_PACKET; 4959 break; 4960 default: 4961 pf_set_protostate(s, PF_PEER_SRC, PFOTHERS_SINGLE); 4962 pf_set_protostate(s, PF_PEER_DST, PFOTHERS_NO_TRAFFIC); 4963 s->timeout = PFTM_OTHER_FIRST_PACKET; 4964 } 4965 4966 if (r->rt) { 4967 /* pf_map_addr increases the reason counters */ 4968 if ((reason = pf_map_addr(pd->af, r, pd->src, &s->rt_addr, 4969 &s->rt_kif, NULL, &sn)) != 0) 4970 goto csfailed; 4971 s->rt = r->rt; 4972 } 4973 4974 s->creation = s->expire = pf_get_uptime(); 4975 4976 if (sn != NULL) 4977 s->src_node = sn; 4978 if (nsn != NULL) { 4979 /* XXX We only modify one side for now. */ 4980 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 4981 s->nat_src_node = nsn; 4982 } 4983 if (pd->proto == IPPROTO_TCP) { 4984 if (s->state_flags & PFSTATE_SCRUB_TCP && 4985 pf_normalize_tcp_init(m, off, pd, th, &s->src, &s->dst)) { 4986 REASON_SET(&reason, PFRES_MEMORY); 4987 goto drop; 4988 } 4989 if (s->state_flags & PFSTATE_SCRUB_TCP && s->src.scrub && 4990 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 4991 &s->src, &s->dst, rewrite)) { 4992 /* This really shouldn't happen!!! */ 4993 DPFPRINTF(PF_DEBUG_URGENT, 4994 ("pf_normalize_tcp_stateful failed on first " 4995 "pkt\n")); 4996 goto drop; 4997 } 4998 } else if (pd->proto == IPPROTO_SCTP) { 4999 if (pf_normalize_sctp_init(m, off, pd, &s->src, &s->dst)) 5000 goto drop; 5001 if (! (pd->sctp_flags & (PFDESC_SCTP_INIT | PFDESC_SCTP_ADD_IP))) 5002 goto drop; 5003 } 5004 s->direction = pd->dir; 5005 5006 /* 5007 * sk/nk could already been setup by pf_get_translation(). 5008 */ 5009 if (nr == NULL) { 5010 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 5011 __func__, nr, sk, nk)); 5012 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 5013 if (sk == NULL) 5014 goto csfailed; 5015 nk = sk; 5016 } else 5017 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 5018 __func__, nr, sk, nk)); 5019 5020 /* Swap sk/nk for PF_OUT. */ 5021 if (pf_state_insert(BOUND_IFACE(r, kif, pd), kif, 5022 (pd->dir == PF_IN) ? sk : nk, 5023 (pd->dir == PF_IN) ? nk : sk, s)) { 5024 REASON_SET(&reason, PFRES_STATEINS); 5025 goto drop; 5026 } else 5027 *sm = s; 5028 5029 if (tag > 0) 5030 s->tag = tag; 5031 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 5032 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 5033 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_SRC); 5034 /* undo NAT changes, if they have taken place */ 5035 if (nr != NULL) { 5036 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 5037 if (pd->dir == PF_OUT) 5038 skt = s->key[PF_SK_STACK]; 5039 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 5040 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 5041 if (pd->sport) 5042 *pd->sport = skt->port[pd->sidx]; 5043 if (pd->dport) 5044 *pd->dport = skt->port[pd->didx]; 5045 if (pd->proto_sum) 5046 *pd->proto_sum = bproto_sum; 5047 if (pd->ip_sum) 5048 *pd->ip_sum = bip_sum; 5049 m_copyback(m, off, hdrlen, pd->hdr.any); 5050 } 5051 s->src.seqhi = htonl(arc4random()); 5052 /* Find mss option */ 5053 int rtid = M_GETFIB(m); 5054 mss = pf_get_mss(m, off, th->th_off, pd->af); 5055 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 5056 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 5057 s->src.mss = mss; 5058 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 5059 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 5060 TH_SYN|TH_ACK, 0, s->src.mss, 0, true, 0, 0, 5061 pd->act.rtableid); 5062 REASON_SET(&reason, PFRES_SYNPROXY); 5063 return (PF_SYNPROXY_DROP); 5064 } 5065 5066 return (PF_PASS); 5067 5068 csfailed: 5069 while ((ri = SLIST_FIRST(match_rules))) { 5070 SLIST_REMOVE_HEAD(match_rules, entry); 5071 free(ri, M_PF_RULE_ITEM); 5072 } 5073 5074 uma_zfree(V_pf_state_key_z, sk); 5075 uma_zfree(V_pf_state_key_z, nk); 5076 5077 if (sn != NULL) { 5078 PF_SRC_NODE_LOCK(sn); 5079 if (--sn->states == 0 && sn->expire == 0) { 5080 pf_unlink_src_node(sn); 5081 uma_zfree(V_pf_sources_z, sn); 5082 counter_u64_add( 5083 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 5084 } 5085 PF_SRC_NODE_UNLOCK(sn); 5086 } 5087 5088 if (nsn != sn && nsn != NULL) { 5089 PF_SRC_NODE_LOCK(nsn); 5090 if (--nsn->states == 0 && nsn->expire == 0) { 5091 pf_unlink_src_node(nsn); 5092 uma_zfree(V_pf_sources_z, nsn); 5093 counter_u64_add( 5094 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 5095 } 5096 PF_SRC_NODE_UNLOCK(nsn); 5097 } 5098 5099 drop: 5100 if (s != NULL) { 5101 pf_src_tree_remove_state(s); 5102 s->timeout = PFTM_UNLINKED; 5103 STATE_DEC_COUNTERS(s); 5104 pf_free_state(s); 5105 } 5106 5107 return (PF_DROP); 5108 } 5109 5110 static int 5111 pf_test_fragment(struct pf_krule **rm, struct pfi_kkif *kif, 5112 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_krule **am, 5113 struct pf_kruleset **rsm) 5114 { 5115 struct pf_krule *r, *a = NULL; 5116 struct pf_kruleset *ruleset = NULL; 5117 struct pf_krule_slist match_rules; 5118 struct pf_krule_item *ri; 5119 sa_family_t af = pd->af; 5120 u_short reason; 5121 int tag = -1; 5122 int asd = 0; 5123 int match = 0; 5124 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 5125 5126 PF_RULES_RASSERT(); 5127 5128 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 5129 SLIST_INIT(&match_rules); 5130 while (r != NULL) { 5131 pf_counter_u64_add(&r->evaluations, 1); 5132 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 5133 r = r->skip[PF_SKIP_IFP].ptr; 5134 else if (r->direction && r->direction != pd->dir) 5135 r = r->skip[PF_SKIP_DIR].ptr; 5136 else if (r->af && r->af != af) 5137 r = r->skip[PF_SKIP_AF].ptr; 5138 else if (r->proto && r->proto != pd->proto) 5139 r = r->skip[PF_SKIP_PROTO].ptr; 5140 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 5141 r->src.neg, kif, M_GETFIB(m))) 5142 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 5143 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 5144 r->dst.neg, NULL, M_GETFIB(m))) 5145 r = r->skip[PF_SKIP_DST_ADDR].ptr; 5146 else if (r->tos && !(r->tos == pd->tos)) 5147 r = TAILQ_NEXT(r, entries); 5148 else if (r->os_fingerprint != PF_OSFP_ANY) 5149 r = TAILQ_NEXT(r, entries); 5150 else if (pd->proto == IPPROTO_UDP && 5151 (r->src.port_op || r->dst.port_op)) 5152 r = TAILQ_NEXT(r, entries); 5153 else if (pd->proto == IPPROTO_TCP && 5154 (r->src.port_op || r->dst.port_op || r->flagset)) 5155 r = TAILQ_NEXT(r, entries); 5156 else if ((pd->proto == IPPROTO_ICMP || 5157 pd->proto == IPPROTO_ICMPV6) && 5158 (r->type || r->code)) 5159 r = TAILQ_NEXT(r, entries); 5160 else if (r->prio && 5161 !pf_match_ieee8021q_pcp(r->prio, m)) 5162 r = TAILQ_NEXT(r, entries); 5163 else if (r->prob && r->prob <= 5164 (arc4random() % (UINT_MAX - 1) + 1)) 5165 r = TAILQ_NEXT(r, entries); 5166 else if (r->match_tag && !pf_match_tag(m, r, &tag, 5167 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 5168 r = TAILQ_NEXT(r, entries); 5169 else { 5170 if (r->anchor == NULL) { 5171 if (r->action == PF_MATCH) { 5172 ri = malloc(sizeof(struct pf_krule_item), M_PF_RULE_ITEM, M_NOWAIT | M_ZERO); 5173 if (ri == NULL) { 5174 REASON_SET(&reason, PFRES_MEMORY); 5175 goto cleanup; 5176 } 5177 ri->r = r; 5178 SLIST_INSERT_HEAD(&match_rules, ri, entry); 5179 pf_counter_u64_critical_enter(); 5180 pf_counter_u64_add_protected(&r->packets[pd->dir == PF_OUT], 1); 5181 pf_counter_u64_add_protected(&r->bytes[pd->dir == PF_OUT], pd->tot_len); 5182 pf_counter_u64_critical_exit(); 5183 pf_rule_to_actions(r, &pd->act); 5184 if (r->log) 5185 PFLOG_PACKET(kif, m, af, 5186 r->action, PFRES_MATCH, r, 5187 a, ruleset, pd, 1); 5188 } else { 5189 match = 1; 5190 *rm = r; 5191 *am = a; 5192 *rsm = ruleset; 5193 } 5194 if ((*rm)->quick) 5195 break; 5196 r = TAILQ_NEXT(r, entries); 5197 } else 5198 pf_step_into_anchor(anchor_stack, &asd, 5199 &ruleset, PF_RULESET_FILTER, &r, &a, 5200 &match); 5201 } 5202 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 5203 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 5204 break; 5205 } 5206 r = *rm; 5207 a = *am; 5208 ruleset = *rsm; 5209 5210 REASON_SET(&reason, PFRES_MATCH); 5211 5212 /* apply actions for last matching pass/block rule */ 5213 pf_rule_to_actions(r, &pd->act); 5214 5215 if (r->log) 5216 PFLOG_PACKET(kif, m, af, r->action, reason, r, a, ruleset, pd, 1); 5217 5218 if (r->action != PF_PASS) 5219 return (PF_DROP); 5220 5221 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 5222 REASON_SET(&reason, PFRES_MEMORY); 5223 goto cleanup; 5224 } 5225 5226 return (PF_PASS); 5227 5228 cleanup: 5229 while ((ri = SLIST_FIRST(&match_rules))) { 5230 SLIST_REMOVE_HEAD(&match_rules, entry); 5231 free(ri, M_PF_RULE_ITEM); 5232 } 5233 5234 return (PF_DROP); 5235 } 5236 5237 static int 5238 pf_tcp_track_full(struct pf_kstate **state, struct pfi_kkif *kif, 5239 struct mbuf *m, int off, struct pf_pdesc *pd, u_short *reason, 5240 int *copyback) 5241 { 5242 struct tcphdr *th = &pd->hdr.tcp; 5243 struct pf_state_peer *src, *dst; 5244 u_int16_t win = ntohs(th->th_win); 5245 u_int32_t ack, end, seq, orig_seq; 5246 u_int8_t sws, dws, psrc, pdst; 5247 int ackskew; 5248 5249 if (pd->dir == (*state)->direction) { 5250 src = &(*state)->src; 5251 dst = &(*state)->dst; 5252 psrc = PF_PEER_SRC; 5253 pdst = PF_PEER_DST; 5254 } else { 5255 src = &(*state)->dst; 5256 dst = &(*state)->src; 5257 psrc = PF_PEER_DST; 5258 pdst = PF_PEER_SRC; 5259 } 5260 5261 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 5262 sws = src->wscale & PF_WSCALE_MASK; 5263 dws = dst->wscale & PF_WSCALE_MASK; 5264 } else 5265 sws = dws = 0; 5266 5267 /* 5268 * Sequence tracking algorithm from Guido van Rooij's paper: 5269 * http://www.madison-gurkha.com/publications/tcp_filtering/ 5270 * tcp_filtering.ps 5271 */ 5272 5273 orig_seq = seq = ntohl(th->th_seq); 5274 if (src->seqlo == 0) { 5275 /* First packet from this end. Set its state */ 5276 5277 if (((*state)->state_flags & PFSTATE_SCRUB_TCP || dst->scrub) && 5278 src->scrub == NULL) { 5279 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 5280 REASON_SET(reason, PFRES_MEMORY); 5281 return (PF_DROP); 5282 } 5283 } 5284 5285 /* Deferred generation of sequence number modulator */ 5286 if (dst->seqdiff && !src->seqdiff) { 5287 /* use random iss for the TCP server */ 5288 while ((src->seqdiff = arc4random() - seq) == 0) 5289 ; 5290 ack = ntohl(th->th_ack) - dst->seqdiff; 5291 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 5292 src->seqdiff), 0); 5293 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 5294 *copyback = 1; 5295 } else { 5296 ack = ntohl(th->th_ack); 5297 } 5298 5299 end = seq + pd->p_len; 5300 if (th->th_flags & TH_SYN) { 5301 end++; 5302 if (dst->wscale & PF_WSCALE_FLAG) { 5303 src->wscale = pf_get_wscale(m, off, th->th_off, 5304 pd->af); 5305 if (src->wscale & PF_WSCALE_FLAG) { 5306 /* Remove scale factor from initial 5307 * window */ 5308 sws = src->wscale & PF_WSCALE_MASK; 5309 win = ((u_int32_t)win + (1 << sws) - 1) 5310 >> sws; 5311 dws = dst->wscale & PF_WSCALE_MASK; 5312 } else { 5313 /* fixup other window */ 5314 dst->max_win <<= dst->wscale & 5315 PF_WSCALE_MASK; 5316 /* in case of a retrans SYN|ACK */ 5317 dst->wscale = 0; 5318 } 5319 } 5320 } 5321 if (th->th_flags & TH_FIN) 5322 end++; 5323 5324 src->seqlo = seq; 5325 if (src->state < TCPS_SYN_SENT) 5326 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5327 5328 /* 5329 * May need to slide the window (seqhi may have been set by 5330 * the crappy stack check or if we picked up the connection 5331 * after establishment) 5332 */ 5333 if (src->seqhi == 1 || 5334 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 5335 src->seqhi = end + MAX(1, dst->max_win << dws); 5336 if (win > src->max_win) 5337 src->max_win = win; 5338 5339 } else { 5340 ack = ntohl(th->th_ack) - dst->seqdiff; 5341 if (src->seqdiff) { 5342 /* Modulate sequence numbers */ 5343 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 5344 src->seqdiff), 0); 5345 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 5346 *copyback = 1; 5347 } 5348 end = seq + pd->p_len; 5349 if (th->th_flags & TH_SYN) 5350 end++; 5351 if (th->th_flags & TH_FIN) 5352 end++; 5353 } 5354 5355 if ((th->th_flags & TH_ACK) == 0) { 5356 /* Let it pass through the ack skew check */ 5357 ack = dst->seqlo; 5358 } else if ((ack == 0 && 5359 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 5360 /* broken tcp stacks do not set ack */ 5361 (dst->state < TCPS_SYN_SENT)) { 5362 /* 5363 * Many stacks (ours included) will set the ACK number in an 5364 * FIN|ACK if the SYN times out -- no sequence to ACK. 5365 */ 5366 ack = dst->seqlo; 5367 } 5368 5369 if (seq == end) { 5370 /* Ease sequencing restrictions on no data packets */ 5371 seq = src->seqlo; 5372 end = seq; 5373 } 5374 5375 ackskew = dst->seqlo - ack; 5376 5377 /* 5378 * Need to demodulate the sequence numbers in any TCP SACK options 5379 * (Selective ACK). We could optionally validate the SACK values 5380 * against the current ACK window, either forwards or backwards, but 5381 * I'm not confident that SACK has been implemented properly 5382 * everywhere. It wouldn't surprise me if several stacks accidentally 5383 * SACK too far backwards of previously ACKed data. There really aren't 5384 * any security implications of bad SACKing unless the target stack 5385 * doesn't validate the option length correctly. Someone trying to 5386 * spoof into a TCP connection won't bother blindly sending SACK 5387 * options anyway. 5388 */ 5389 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 5390 if (pf_modulate_sack(m, off, pd, th, dst)) 5391 *copyback = 1; 5392 } 5393 5394 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 5395 if (SEQ_GEQ(src->seqhi, end) && 5396 /* Last octet inside other's window space */ 5397 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 5398 /* Retrans: not more than one window back */ 5399 (ackskew >= -MAXACKWINDOW) && 5400 /* Acking not more than one reassembled fragment backwards */ 5401 (ackskew <= (MAXACKWINDOW << sws)) && 5402 /* Acking not more than one window forward */ 5403 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 5404 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo))) { 5405 /* Require an exact/+1 sequence match on resets when possible */ 5406 5407 if (dst->scrub || src->scrub) { 5408 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5409 *state, src, dst, copyback)) 5410 return (PF_DROP); 5411 } 5412 5413 /* update max window */ 5414 if (src->max_win < win) 5415 src->max_win = win; 5416 /* synchronize sequencing */ 5417 if (SEQ_GT(end, src->seqlo)) 5418 src->seqlo = end; 5419 /* slide the window of what the other end can send */ 5420 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5421 dst->seqhi = ack + MAX((win << sws), 1); 5422 5423 /* update states */ 5424 if (th->th_flags & TH_SYN) 5425 if (src->state < TCPS_SYN_SENT) 5426 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5427 if (th->th_flags & TH_FIN) 5428 if (src->state < TCPS_CLOSING) 5429 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5430 if (th->th_flags & TH_ACK) { 5431 if (dst->state == TCPS_SYN_SENT) { 5432 pf_set_protostate(*state, pdst, 5433 TCPS_ESTABLISHED); 5434 if (src->state == TCPS_ESTABLISHED && 5435 (*state)->src_node != NULL && 5436 pf_src_connlimit(state)) { 5437 REASON_SET(reason, PFRES_SRCLIMIT); 5438 return (PF_DROP); 5439 } 5440 } else if (dst->state == TCPS_CLOSING) 5441 pf_set_protostate(*state, pdst, 5442 TCPS_FIN_WAIT_2); 5443 } 5444 if (th->th_flags & TH_RST) 5445 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5446 5447 /* update expire time */ 5448 (*state)->expire = pf_get_uptime(); 5449 if (src->state >= TCPS_FIN_WAIT_2 && 5450 dst->state >= TCPS_FIN_WAIT_2) 5451 (*state)->timeout = PFTM_TCP_CLOSED; 5452 else if (src->state >= TCPS_CLOSING && 5453 dst->state >= TCPS_CLOSING) 5454 (*state)->timeout = PFTM_TCP_FIN_WAIT; 5455 else if (src->state < TCPS_ESTABLISHED || 5456 dst->state < TCPS_ESTABLISHED) 5457 (*state)->timeout = PFTM_TCP_OPENING; 5458 else if (src->state >= TCPS_CLOSING || 5459 dst->state >= TCPS_CLOSING) 5460 (*state)->timeout = PFTM_TCP_CLOSING; 5461 else 5462 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5463 5464 /* Fall through to PASS packet */ 5465 5466 } else if ((dst->state < TCPS_SYN_SENT || 5467 dst->state >= TCPS_FIN_WAIT_2 || 5468 src->state >= TCPS_FIN_WAIT_2) && 5469 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 5470 /* Within a window forward of the originating packet */ 5471 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 5472 /* Within a window backward of the originating packet */ 5473 5474 /* 5475 * This currently handles three situations: 5476 * 1) Stupid stacks will shotgun SYNs before their peer 5477 * replies. 5478 * 2) When PF catches an already established stream (the 5479 * firewall rebooted, the state table was flushed, routes 5480 * changed...) 5481 * 3) Packets get funky immediately after the connection 5482 * closes (this should catch Solaris spurious ACK|FINs 5483 * that web servers like to spew after a close) 5484 * 5485 * This must be a little more careful than the above code 5486 * since packet floods will also be caught here. We don't 5487 * update the TTL here to mitigate the damage of a packet 5488 * flood and so the same code can handle awkward establishment 5489 * and a loosened connection close. 5490 * In the establishment case, a correct peer response will 5491 * validate the connection, go through the normal state code 5492 * and keep updating the state TTL. 5493 */ 5494 5495 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5496 printf("pf: loose state match: "); 5497 pf_print_state(*state); 5498 pf_print_flags(th->th_flags); 5499 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5500 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 5501 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 5502 (unsigned long long)(*state)->packets[1], 5503 pd->dir == PF_IN ? "in" : "out", 5504 pd->dir == (*state)->direction ? "fwd" : "rev"); 5505 } 5506 5507 if (dst->scrub || src->scrub) { 5508 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 5509 *state, src, dst, copyback)) 5510 return (PF_DROP); 5511 } 5512 5513 /* update max window */ 5514 if (src->max_win < win) 5515 src->max_win = win; 5516 /* synchronize sequencing */ 5517 if (SEQ_GT(end, src->seqlo)) 5518 src->seqlo = end; 5519 /* slide the window of what the other end can send */ 5520 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 5521 dst->seqhi = ack + MAX((win << sws), 1); 5522 5523 /* 5524 * Cannot set dst->seqhi here since this could be a shotgunned 5525 * SYN and not an already established connection. 5526 */ 5527 5528 if (th->th_flags & TH_FIN) 5529 if (src->state < TCPS_CLOSING) 5530 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5531 if (th->th_flags & TH_RST) 5532 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5533 5534 /* Fall through to PASS packet */ 5535 5536 } else { 5537 if ((*state)->dst.state == TCPS_SYN_SENT && 5538 (*state)->src.state == TCPS_SYN_SENT) { 5539 /* Send RST for state mismatches during handshake */ 5540 if (!(th->th_flags & TH_RST)) 5541 pf_send_tcp((*state)->rule.ptr, pd->af, 5542 pd->dst, pd->src, th->th_dport, 5543 th->th_sport, ntohl(th->th_ack), 0, 5544 TH_RST, 0, 0, 5545 (*state)->rule.ptr->return_ttl, true, 0, 0, 5546 (*state)->act.rtableid); 5547 src->seqlo = 0; 5548 src->seqhi = 1; 5549 src->max_win = 1; 5550 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 5551 printf("pf: BAD state: "); 5552 pf_print_state(*state); 5553 pf_print_flags(th->th_flags); 5554 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5555 "pkts=%llu:%llu dir=%s,%s\n", 5556 seq, orig_seq, ack, pd->p_len, ackskew, 5557 (unsigned long long)(*state)->packets[0], 5558 (unsigned long long)(*state)->packets[1], 5559 pd->dir == PF_IN ? "in" : "out", 5560 pd->dir == (*state)->direction ? "fwd" : "rev"); 5561 printf("pf: State failure on: %c %c %c %c | %c %c\n", 5562 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 5563 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 5564 ' ': '2', 5565 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 5566 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 5567 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 5568 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 5569 } 5570 REASON_SET(reason, PFRES_BADSTATE); 5571 return (PF_DROP); 5572 } 5573 5574 return (PF_PASS); 5575 } 5576 5577 static int 5578 pf_tcp_track_sloppy(struct pf_kstate **state, struct pf_pdesc *pd, u_short *reason) 5579 { 5580 struct tcphdr *th = &pd->hdr.tcp; 5581 struct pf_state_peer *src, *dst; 5582 u_int8_t psrc, pdst; 5583 5584 if (pd->dir == (*state)->direction) { 5585 src = &(*state)->src; 5586 dst = &(*state)->dst; 5587 psrc = PF_PEER_SRC; 5588 pdst = PF_PEER_DST; 5589 } else { 5590 src = &(*state)->dst; 5591 dst = &(*state)->src; 5592 psrc = PF_PEER_DST; 5593 pdst = PF_PEER_SRC; 5594 } 5595 5596 if (th->th_flags & TH_SYN) 5597 if (src->state < TCPS_SYN_SENT) 5598 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 5599 if (th->th_flags & TH_FIN) 5600 if (src->state < TCPS_CLOSING) 5601 pf_set_protostate(*state, psrc, TCPS_CLOSING); 5602 if (th->th_flags & TH_ACK) { 5603 if (dst->state == TCPS_SYN_SENT) { 5604 pf_set_protostate(*state, pdst, TCPS_ESTABLISHED); 5605 if (src->state == TCPS_ESTABLISHED && 5606 (*state)->src_node != NULL && 5607 pf_src_connlimit(state)) { 5608 REASON_SET(reason, PFRES_SRCLIMIT); 5609 return (PF_DROP); 5610 } 5611 } else if (dst->state == TCPS_CLOSING) { 5612 pf_set_protostate(*state, pdst, TCPS_FIN_WAIT_2); 5613 } else if (src->state == TCPS_SYN_SENT && 5614 dst->state < TCPS_SYN_SENT) { 5615 /* 5616 * Handle a special sloppy case where we only see one 5617 * half of the connection. If there is a ACK after 5618 * the initial SYN without ever seeing a packet from 5619 * the destination, set the connection to established. 5620 */ 5621 pf_set_protostate(*state, PF_PEER_BOTH, 5622 TCPS_ESTABLISHED); 5623 dst->state = src->state = TCPS_ESTABLISHED; 5624 if ((*state)->src_node != NULL && 5625 pf_src_connlimit(state)) { 5626 REASON_SET(reason, PFRES_SRCLIMIT); 5627 return (PF_DROP); 5628 } 5629 } else if (src->state == TCPS_CLOSING && 5630 dst->state == TCPS_ESTABLISHED && 5631 dst->seqlo == 0) { 5632 /* 5633 * Handle the closing of half connections where we 5634 * don't see the full bidirectional FIN/ACK+ACK 5635 * handshake. 5636 */ 5637 pf_set_protostate(*state, pdst, TCPS_CLOSING); 5638 } 5639 } 5640 if (th->th_flags & TH_RST) 5641 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 5642 5643 /* update expire time */ 5644 (*state)->expire = pf_get_uptime(); 5645 if (src->state >= TCPS_FIN_WAIT_2 && 5646 dst->state >= TCPS_FIN_WAIT_2) 5647 (*state)->timeout = PFTM_TCP_CLOSED; 5648 else if (src->state >= TCPS_CLOSING && 5649 dst->state >= TCPS_CLOSING) 5650 (*state)->timeout = PFTM_TCP_FIN_WAIT; 5651 else if (src->state < TCPS_ESTABLISHED || 5652 dst->state < TCPS_ESTABLISHED) 5653 (*state)->timeout = PFTM_TCP_OPENING; 5654 else if (src->state >= TCPS_CLOSING || 5655 dst->state >= TCPS_CLOSING) 5656 (*state)->timeout = PFTM_TCP_CLOSING; 5657 else 5658 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5659 5660 return (PF_PASS); 5661 } 5662 5663 static int 5664 pf_synproxy(struct pf_pdesc *pd, struct pf_kstate **state, u_short *reason) 5665 { 5666 struct pf_state_key *sk = (*state)->key[pd->didx]; 5667 struct tcphdr *th = &pd->hdr.tcp; 5668 5669 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 5670 if (pd->dir != (*state)->direction) { 5671 REASON_SET(reason, PFRES_SYNPROXY); 5672 return (PF_SYNPROXY_DROP); 5673 } 5674 if (th->th_flags & TH_SYN) { 5675 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 5676 REASON_SET(reason, PFRES_SYNPROXY); 5677 return (PF_DROP); 5678 } 5679 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5680 pd->src, th->th_dport, th->th_sport, 5681 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 5682 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, true, 0, 0, 5683 (*state)->act.rtableid); 5684 REASON_SET(reason, PFRES_SYNPROXY); 5685 return (PF_SYNPROXY_DROP); 5686 } else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK || 5687 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5688 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5689 REASON_SET(reason, PFRES_SYNPROXY); 5690 return (PF_DROP); 5691 } else if ((*state)->src_node != NULL && 5692 pf_src_connlimit(state)) { 5693 REASON_SET(reason, PFRES_SRCLIMIT); 5694 return (PF_DROP); 5695 } else 5696 pf_set_protostate(*state, PF_PEER_SRC, 5697 PF_TCPS_PROXY_DST); 5698 } 5699 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 5700 if (pd->dir == (*state)->direction) { 5701 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 5702 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5703 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5704 REASON_SET(reason, PFRES_SYNPROXY); 5705 return (PF_DROP); 5706 } 5707 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 5708 if ((*state)->dst.seqhi == 1) 5709 (*state)->dst.seqhi = htonl(arc4random()); 5710 pf_send_tcp((*state)->rule.ptr, pd->af, 5711 &sk->addr[pd->sidx], &sk->addr[pd->didx], 5712 sk->port[pd->sidx], sk->port[pd->didx], 5713 (*state)->dst.seqhi, 0, TH_SYN, 0, 5714 (*state)->src.mss, 0, false, (*state)->tag, 0, 5715 (*state)->act.rtableid); 5716 REASON_SET(reason, PFRES_SYNPROXY); 5717 return (PF_SYNPROXY_DROP); 5718 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 5719 (TH_SYN|TH_ACK)) || 5720 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 5721 REASON_SET(reason, PFRES_SYNPROXY); 5722 return (PF_DROP); 5723 } else { 5724 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 5725 (*state)->dst.seqlo = ntohl(th->th_seq); 5726 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5727 pd->src, th->th_dport, th->th_sport, 5728 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 5729 TH_ACK, (*state)->src.max_win, 0, 0, false, 5730 (*state)->tag, 0, (*state)->act.rtableid); 5731 pf_send_tcp((*state)->rule.ptr, pd->af, 5732 &sk->addr[pd->sidx], &sk->addr[pd->didx], 5733 sk->port[pd->sidx], sk->port[pd->didx], 5734 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 5735 TH_ACK, (*state)->dst.max_win, 0, 0, true, 0, 0, 5736 (*state)->act.rtableid); 5737 (*state)->src.seqdiff = (*state)->dst.seqhi - 5738 (*state)->src.seqlo; 5739 (*state)->dst.seqdiff = (*state)->src.seqhi - 5740 (*state)->dst.seqlo; 5741 (*state)->src.seqhi = (*state)->src.seqlo + 5742 (*state)->dst.max_win; 5743 (*state)->dst.seqhi = (*state)->dst.seqlo + 5744 (*state)->src.max_win; 5745 (*state)->src.wscale = (*state)->dst.wscale = 0; 5746 pf_set_protostate(*state, PF_PEER_BOTH, 5747 TCPS_ESTABLISHED); 5748 REASON_SET(reason, PFRES_SYNPROXY); 5749 return (PF_SYNPROXY_DROP); 5750 } 5751 } 5752 5753 return (PF_PASS); 5754 } 5755 5756 static int 5757 pf_test_state_tcp(struct pf_kstate **state, struct pfi_kkif *kif, 5758 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 5759 u_short *reason) 5760 { 5761 struct pf_state_key_cmp key; 5762 struct tcphdr *th = &pd->hdr.tcp; 5763 int copyback = 0; 5764 int action; 5765 struct pf_state_peer *src, *dst; 5766 5767 bzero(&key, sizeof(key)); 5768 key.af = pd->af; 5769 key.proto = IPPROTO_TCP; 5770 if (pd->dir == PF_IN) { /* wire side, straight */ 5771 PF_ACPY(&key.addr[0], pd->src, key.af); 5772 PF_ACPY(&key.addr[1], pd->dst, key.af); 5773 key.port[0] = th->th_sport; 5774 key.port[1] = th->th_dport; 5775 } else { /* stack side, reverse */ 5776 PF_ACPY(&key.addr[1], pd->src, key.af); 5777 PF_ACPY(&key.addr[0], pd->dst, key.af); 5778 key.port[1] = th->th_sport; 5779 key.port[0] = th->th_dport; 5780 } 5781 5782 STATE_LOOKUP(kif, &key, *state, pd); 5783 5784 if (pd->dir == (*state)->direction) { 5785 src = &(*state)->src; 5786 dst = &(*state)->dst; 5787 } else { 5788 src = &(*state)->dst; 5789 dst = &(*state)->src; 5790 } 5791 5792 if ((action = pf_synproxy(pd, state, reason)) != PF_PASS) 5793 return (action); 5794 5795 if (dst->state >= TCPS_FIN_WAIT_2 && 5796 src->state >= TCPS_FIN_WAIT_2 && 5797 (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) || 5798 ((th->th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_ACK && 5799 pf_syncookie_check(pd) && pd->dir == PF_IN))) { 5800 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5801 printf("pf: state reuse "); 5802 pf_print_state(*state); 5803 pf_print_flags(th->th_flags); 5804 printf("\n"); 5805 } 5806 /* XXX make sure it's the same direction ?? */ 5807 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED); 5808 pf_unlink_state(*state); 5809 *state = NULL; 5810 return (PF_DROP); 5811 } 5812 5813 if ((*state)->state_flags & PFSTATE_SLOPPY) { 5814 if (pf_tcp_track_sloppy(state, pd, reason) == PF_DROP) 5815 return (PF_DROP); 5816 } else { 5817 if (pf_tcp_track_full(state, kif, m, off, pd, reason, 5818 ©back) == PF_DROP) 5819 return (PF_DROP); 5820 } 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] != th->th_sport) 5828 pf_change_ap(m, pd->src, &th->th_sport, 5829 pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], 5830 nk->port[pd->sidx], 0, pd->af); 5831 5832 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5833 nk->port[pd->didx] != th->th_dport) 5834 pf_change_ap(m, pd->dst, &th->th_dport, 5835 pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], 5836 nk->port[pd->didx], 0, pd->af); 5837 copyback = 1; 5838 } 5839 5840 /* Copyback sequence modulation or stateful scrub changes if needed */ 5841 if (copyback) 5842 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5843 5844 return (PF_PASS); 5845 } 5846 5847 static int 5848 pf_test_state_udp(struct pf_kstate **state, struct pfi_kkif *kif, 5849 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5850 { 5851 struct pf_state_peer *src, *dst; 5852 struct pf_state_key_cmp key; 5853 struct udphdr *uh = &pd->hdr.udp; 5854 uint8_t psrc, pdst; 5855 5856 bzero(&key, sizeof(key)); 5857 key.af = pd->af; 5858 key.proto = IPPROTO_UDP; 5859 if (pd->dir == PF_IN) { /* wire side, straight */ 5860 PF_ACPY(&key.addr[0], pd->src, key.af); 5861 PF_ACPY(&key.addr[1], pd->dst, key.af); 5862 key.port[0] = uh->uh_sport; 5863 key.port[1] = uh->uh_dport; 5864 } else { /* stack side, reverse */ 5865 PF_ACPY(&key.addr[1], pd->src, key.af); 5866 PF_ACPY(&key.addr[0], pd->dst, key.af); 5867 key.port[1] = uh->uh_sport; 5868 key.port[0] = uh->uh_dport; 5869 } 5870 5871 STATE_LOOKUP(kif, &key, *state, pd); 5872 5873 if (pd->dir == (*state)->direction) { 5874 src = &(*state)->src; 5875 dst = &(*state)->dst; 5876 psrc = PF_PEER_SRC; 5877 pdst = PF_PEER_DST; 5878 } else { 5879 src = &(*state)->dst; 5880 dst = &(*state)->src; 5881 psrc = PF_PEER_DST; 5882 pdst = PF_PEER_SRC; 5883 } 5884 5885 /* update states */ 5886 if (src->state < PFUDPS_SINGLE) 5887 pf_set_protostate(*state, psrc, PFUDPS_SINGLE); 5888 if (dst->state == PFUDPS_SINGLE) 5889 pf_set_protostate(*state, pdst, PFUDPS_MULTIPLE); 5890 5891 /* update expire time */ 5892 (*state)->expire = pf_get_uptime(); 5893 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5894 (*state)->timeout = PFTM_UDP_MULTIPLE; 5895 else 5896 (*state)->timeout = PFTM_UDP_SINGLE; 5897 5898 /* translate source/destination address, if necessary */ 5899 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5900 struct pf_state_key *nk = (*state)->key[pd->didx]; 5901 5902 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5903 nk->port[pd->sidx] != uh->uh_sport) 5904 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 5905 &uh->uh_sum, &nk->addr[pd->sidx], 5906 nk->port[pd->sidx], 1, pd->af); 5907 5908 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5909 nk->port[pd->didx] != uh->uh_dport) 5910 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 5911 &uh->uh_sum, &nk->addr[pd->didx], 5912 nk->port[pd->didx], 1, pd->af); 5913 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5914 } 5915 5916 return (PF_PASS); 5917 } 5918 5919 static int 5920 pf_test_state_sctp(struct pf_kstate **state, struct pfi_kkif *kif, 5921 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5922 { 5923 struct pf_state_key_cmp key; 5924 struct pf_state_peer *src, *dst; 5925 struct sctphdr *sh = &pd->hdr.sctp; 5926 u_int8_t psrc; //, pdst; 5927 5928 bzero(&key, sizeof(key)); 5929 key.af = pd->af; 5930 key.proto = IPPROTO_SCTP; 5931 if (pd->dir == PF_IN) { /* wire side, straight */ 5932 PF_ACPY(&key.addr[0], pd->src, key.af); 5933 PF_ACPY(&key.addr[1], pd->dst, key.af); 5934 key.port[0] = sh->src_port; 5935 key.port[1] = sh->dest_port; 5936 } else { /* stack side, reverse */ 5937 PF_ACPY(&key.addr[1], pd->src, key.af); 5938 PF_ACPY(&key.addr[0], pd->dst, key.af); 5939 key.port[1] = sh->src_port; 5940 key.port[0] = sh->dest_port; 5941 } 5942 5943 STATE_LOOKUP(kif, &key, *state, pd); 5944 5945 if (pd->dir == (*state)->direction) { 5946 src = &(*state)->src; 5947 dst = &(*state)->dst; 5948 psrc = PF_PEER_SRC; 5949 } else { 5950 src = &(*state)->dst; 5951 dst = &(*state)->src; 5952 psrc = PF_PEER_DST; 5953 } 5954 5955 /* Track state. */ 5956 if (pd->sctp_flags & PFDESC_SCTP_INIT) { 5957 if (src->state < SCTP_COOKIE_WAIT) { 5958 pf_set_protostate(*state, psrc, SCTP_COOKIE_WAIT); 5959 (*state)->timeout = PFTM_SCTP_OPENING; 5960 } 5961 } 5962 if (pd->sctp_flags & PFDESC_SCTP_INIT_ACK) { 5963 MPASS(dst->scrub != NULL); 5964 if (dst->scrub->pfss_v_tag == 0) 5965 dst->scrub->pfss_v_tag = pd->sctp_initiate_tag; 5966 } 5967 5968 if (pd->sctp_flags & (PFDESC_SCTP_COOKIE | PFDESC_SCTP_HEARTBEAT_ACK)) { 5969 if (src->state < SCTP_ESTABLISHED) { 5970 pf_set_protostate(*state, psrc, SCTP_ESTABLISHED); 5971 (*state)->timeout = PFTM_SCTP_ESTABLISHED; 5972 } 5973 } 5974 if (pd->sctp_flags & (PFDESC_SCTP_SHUTDOWN | PFDESC_SCTP_ABORT | 5975 PFDESC_SCTP_SHUTDOWN_COMPLETE)) { 5976 if (src->state < SCTP_SHUTDOWN_PENDING) { 5977 pf_set_protostate(*state, psrc, SCTP_SHUTDOWN_PENDING); 5978 (*state)->timeout = PFTM_SCTP_CLOSING; 5979 } 5980 } 5981 if (pd->sctp_flags & (PFDESC_SCTP_SHUTDOWN_COMPLETE)) { 5982 pf_set_protostate(*state, psrc, SCTP_CLOSED); 5983 (*state)->timeout = PFTM_SCTP_CLOSED; 5984 } 5985 5986 if (src->scrub != NULL) { 5987 if (src->scrub->pfss_v_tag == 0) { 5988 src->scrub->pfss_v_tag = pd->hdr.sctp.v_tag; 5989 } else if (src->scrub->pfss_v_tag != pd->hdr.sctp.v_tag) 5990 return (PF_DROP); 5991 } 5992 5993 (*state)->expire = pf_get_uptime(); 5994 5995 /* translate source/destination address, if necessary */ 5996 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5997 uint16_t checksum = 0; 5998 struct pf_state_key *nk = (*state)->key[pd->didx]; 5999 6000 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 6001 nk->port[pd->sidx] != pd->hdr.sctp.src_port) { 6002 pf_change_ap(m, pd->src, &pd->hdr.sctp.src_port, 6003 pd->ip_sum, &checksum, &nk->addr[pd->sidx], 6004 nk->port[pd->sidx], 1, pd->af); 6005 } 6006 6007 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 6008 nk->port[pd->didx] != pd->hdr.sctp.dest_port) { 6009 pf_change_ap(m, pd->dst, &pd->hdr.sctp.dest_port, 6010 pd->ip_sum, &checksum, &nk->addr[pd->didx], 6011 nk->port[pd->didx], 1, pd->af); 6012 } 6013 } 6014 6015 return (PF_PASS); 6016 } 6017 6018 static void 6019 pf_sctp_multihome_detach_addr(const struct pf_kstate *s) 6020 { 6021 struct pf_sctp_endpoint key; 6022 struct pf_sctp_endpoint *ep; 6023 struct pf_state_key *sks = s->key[PF_SK_STACK]; 6024 struct pf_sctp_source *i, *tmp; 6025 6026 if (sks == NULL || sks->proto != IPPROTO_SCTP || s->dst.scrub == NULL) 6027 return; 6028 6029 PF_SCTP_ENDPOINTS_LOCK(); 6030 6031 key.v_tag = s->dst.scrub->pfss_v_tag; 6032 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key); 6033 if (ep != NULL) { 6034 /* XXX Actually remove! */ 6035 TAILQ_FOREACH_SAFE(i, &ep->sources, entry, tmp) { 6036 if (pf_addr_cmp(&i->addr, 6037 &s->key[PF_SK_WIRE]->addr[s->direction == PF_OUT], 6038 s->key[PF_SK_WIRE]->af) == 0) { 6039 TAILQ_REMOVE(&ep->sources, i, entry); 6040 free(i, M_PFTEMP); 6041 break; 6042 } 6043 } 6044 6045 if (TAILQ_EMPTY(&ep->sources)) { 6046 RB_REMOVE(pf_sctp_endpoints, &V_pf_sctp_endpoints, ep); 6047 free(ep, M_PFTEMP); 6048 } 6049 } 6050 6051 /* Other direction. */ 6052 key.v_tag = s->src.scrub->pfss_v_tag; 6053 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key); 6054 if (ep != NULL) { 6055 TAILQ_FOREACH_SAFE(i, &ep->sources, entry, tmp) { 6056 if (pf_addr_cmp(&i->addr, 6057 &s->key[PF_SK_WIRE]->addr[s->direction == PF_IN], 6058 s->key[PF_SK_WIRE]->af) == 0) { 6059 TAILQ_REMOVE(&ep->sources, i, entry); 6060 free(i, M_PFTEMP); 6061 break; 6062 } 6063 } 6064 6065 if (TAILQ_EMPTY(&ep->sources)) { 6066 RB_REMOVE(pf_sctp_endpoints, &V_pf_sctp_endpoints, ep); 6067 free(ep, M_PFTEMP); 6068 } 6069 } 6070 6071 PF_SCTP_ENDPOINTS_UNLOCK(); 6072 } 6073 6074 static void 6075 pf_sctp_multihome_add_addr(struct pf_pdesc *pd, struct pf_addr *a, uint32_t v_tag) 6076 { 6077 struct pf_sctp_endpoint key = { 6078 .v_tag = v_tag, 6079 }; 6080 struct pf_sctp_source *i; 6081 struct pf_sctp_endpoint *ep; 6082 6083 PF_SCTP_ENDPOINTS_LOCK(); 6084 6085 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key); 6086 if (ep == NULL) { 6087 ep = malloc(sizeof(struct pf_sctp_endpoint), 6088 M_PFTEMP, M_NOWAIT); 6089 if (ep == NULL) { 6090 PF_SCTP_ENDPOINTS_UNLOCK(); 6091 return; 6092 } 6093 6094 ep->v_tag = v_tag; 6095 TAILQ_INIT(&ep->sources); 6096 RB_INSERT(pf_sctp_endpoints, &V_pf_sctp_endpoints, ep); 6097 } 6098 6099 /* Avoid inserting duplicates. */ 6100 TAILQ_FOREACH(i, &ep->sources, entry) { 6101 if (pf_addr_cmp(&i->addr, a, pd->af) == 0) { 6102 PF_SCTP_ENDPOINTS_UNLOCK(); 6103 return; 6104 } 6105 } 6106 6107 i = malloc(sizeof(*i), M_PFTEMP, M_NOWAIT); 6108 if (i == NULL) { 6109 PF_SCTP_ENDPOINTS_UNLOCK(); 6110 return; 6111 } 6112 6113 i->af = pd->af; 6114 memcpy(&i->addr, a, sizeof(*a)); 6115 TAILQ_INSERT_TAIL(&ep->sources, i, entry); 6116 6117 PF_SCTP_ENDPOINTS_UNLOCK(); 6118 } 6119 6120 static void 6121 pf_sctp_multihome_delayed(struct pf_pdesc *pd, int off, struct pfi_kkif *kif, 6122 struct pf_kstate *s, int action) 6123 { 6124 struct pf_sctp_multihome_job *j, *tmp; 6125 struct pf_sctp_source *i; 6126 int ret __unused;; 6127 struct pf_kstate *sm = NULL; 6128 struct pf_krule *ra = NULL; 6129 struct pf_krule *r = &V_pf_default_rule; 6130 struct pf_kruleset *rs = NULL; 6131 bool do_extra = true; 6132 6133 PF_RULES_RLOCK_TRACKER; 6134 6135 again: 6136 TAILQ_FOREACH_SAFE(j, &pd->sctp_multihome_jobs, next, tmp) { 6137 if (s == NULL || action != PF_PASS) 6138 goto free; 6139 6140 /* Confirm we don't recurse here. */ 6141 MPASS(! (pd->sctp_flags & PFDESC_SCTP_ADD_IP)); 6142 6143 switch (j->op) { 6144 case SCTP_ADD_IP_ADDRESS: { 6145 uint32_t v_tag = pd->sctp_initiate_tag; 6146 6147 if (v_tag == 0) { 6148 if (s->direction == pd->dir) 6149 v_tag = s->src.scrub->pfss_v_tag; 6150 else 6151 v_tag = s->dst.scrub->pfss_v_tag; 6152 } 6153 6154 /* 6155 * Avoid duplicating states. We'll already have 6156 * created a state based on the source address of 6157 * the packet, but SCTP endpoints may also list this 6158 * address again in the INIT(_ACK) parameters. 6159 */ 6160 if (pf_addr_cmp(&j->src, pd->src, pd->af) == 0) { 6161 break; 6162 } 6163 6164 j->pd.sctp_flags |= PFDESC_SCTP_ADD_IP; 6165 PF_RULES_RLOCK(); 6166 sm = NULL; 6167 /* 6168 * New connections need to be floating, because 6169 * we cannot know what interfaces it will use. 6170 * That's why we pass V_pfi_all rather than kif. 6171 */ 6172 ret = pf_test_rule(&r, &sm, V_pfi_all, 6173 j->m, off, &j->pd, &ra, &rs, NULL); 6174 PF_RULES_RUNLOCK(); 6175 SDT_PROBE4(pf, sctp, multihome, test, kif, r, j->m, ret); 6176 if (ret != PF_DROP && sm != NULL) { 6177 /* Inherit v_tag values. */ 6178 if (sm->direction == s->direction) { 6179 sm->src.scrub->pfss_v_tag = s->src.scrub->pfss_v_tag; 6180 sm->dst.scrub->pfss_v_tag = s->dst.scrub->pfss_v_tag; 6181 } else { 6182 sm->src.scrub->pfss_v_tag = s->dst.scrub->pfss_v_tag; 6183 sm->dst.scrub->pfss_v_tag = s->src.scrub->pfss_v_tag; 6184 } 6185 PF_STATE_UNLOCK(sm); 6186 } else { 6187 /* If we try duplicate inserts? */ 6188 break; 6189 } 6190 6191 /* Only add the addres if we've actually allowed the state. */ 6192 pf_sctp_multihome_add_addr(pd, &j->src, v_tag); 6193 6194 if (! do_extra) { 6195 break; 6196 } 6197 /* 6198 * We need to do this for each of our source addresses. 6199 * Find those based on the verification tag. 6200 */ 6201 struct pf_sctp_endpoint key = { 6202 .v_tag = pd->hdr.sctp.v_tag, 6203 }; 6204 struct pf_sctp_endpoint *ep; 6205 6206 PF_SCTP_ENDPOINTS_LOCK(); 6207 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key); 6208 if (ep == NULL) { 6209 PF_SCTP_ENDPOINTS_UNLOCK(); 6210 break; 6211 } 6212 MPASS(ep != NULL); 6213 6214 TAILQ_FOREACH(i, &ep->sources, entry) { 6215 struct pf_sctp_multihome_job *nj; 6216 6217 /* SCTP can intermingle IPv4 and IPv6. */ 6218 if (i->af != pd->af) 6219 continue; 6220 6221 nj = malloc(sizeof(*nj), M_PFTEMP, M_NOWAIT | M_ZERO); 6222 if (! nj) { 6223 continue; 6224 } 6225 memcpy(&nj->pd, &j->pd, sizeof(j->pd)); 6226 memcpy(&nj->src, &j->src, sizeof(nj->src)); 6227 nj->pd.src = &nj->src; 6228 // New destination address! 6229 memcpy(&nj->dst, &i->addr, sizeof(nj->dst)); 6230 nj->pd.dst = &nj->dst; 6231 nj->m = j->m; 6232 nj->op = j->op; 6233 6234 TAILQ_INSERT_TAIL(&pd->sctp_multihome_jobs, nj, next); 6235 } 6236 PF_SCTP_ENDPOINTS_UNLOCK(); 6237 6238 break; 6239 } 6240 case SCTP_DEL_IP_ADDRESS: { 6241 struct pf_state_key_cmp key; 6242 uint8_t psrc; 6243 6244 bzero(&key, sizeof(key)); 6245 key.af = j->pd.af; 6246 key.proto = IPPROTO_SCTP; 6247 if (j->pd.dir == PF_IN) { /* wire side, straight */ 6248 PF_ACPY(&key.addr[0], j->pd.src, key.af); 6249 PF_ACPY(&key.addr[1], j->pd.dst, key.af); 6250 key.port[0] = j->pd.hdr.sctp.src_port; 6251 key.port[1] = j->pd.hdr.sctp.dest_port; 6252 } else { /* stack side, reverse */ 6253 PF_ACPY(&key.addr[1], j->pd.src, key.af); 6254 PF_ACPY(&key.addr[0], j->pd.dst, key.af); 6255 key.port[1] = j->pd.hdr.sctp.src_port; 6256 key.port[0] = j->pd.hdr.sctp.dest_port; 6257 } 6258 6259 sm = pf_find_state(kif, &key, j->pd.dir); 6260 if (sm != NULL) { 6261 PF_STATE_LOCK_ASSERT(sm); 6262 if (j->pd.dir == sm->direction) { 6263 psrc = PF_PEER_SRC; 6264 } else { 6265 psrc = PF_PEER_DST; 6266 } 6267 pf_set_protostate(sm, psrc, SCTP_SHUTDOWN_PENDING); 6268 sm->timeout = PFTM_SCTP_CLOSING; 6269 PF_STATE_UNLOCK(sm); 6270 } 6271 break; 6272 default: 6273 panic("Unknown op %#x", j->op); 6274 } 6275 } 6276 6277 free: 6278 TAILQ_REMOVE(&pd->sctp_multihome_jobs, j, next); 6279 free(j, M_PFTEMP); 6280 } 6281 6282 /* We may have inserted extra work while processing the list. */ 6283 if (! TAILQ_EMPTY(&pd->sctp_multihome_jobs)) { 6284 do_extra = false; 6285 goto again; 6286 } 6287 } 6288 6289 static int 6290 pf_multihome_scan(struct mbuf *m, int start, int len, struct pf_pdesc *pd, 6291 struct pfi_kkif *kif, int op) 6292 { 6293 int off = 0; 6294 struct pf_sctp_multihome_job *job; 6295 6296 while (off < len) { 6297 struct sctp_paramhdr h; 6298 6299 if (!pf_pull_hdr(m, start + off, &h, sizeof(h), NULL, NULL, 6300 pd->af)) 6301 return (PF_DROP); 6302 6303 /* Parameters are at least 4 bytes. */ 6304 if (ntohs(h.param_length) < 4) 6305 return (PF_DROP); 6306 6307 switch (ntohs(h.param_type)) { 6308 case SCTP_IPV4_ADDRESS: { 6309 struct in_addr t; 6310 6311 if (ntohs(h.param_length) != 6312 (sizeof(struct sctp_paramhdr) + sizeof(t))) 6313 return (PF_DROP); 6314 6315 if (!pf_pull_hdr(m, start + off + sizeof(h), &t, sizeof(t), 6316 NULL, NULL, pd->af)) 6317 return (PF_DROP); 6318 6319 if (in_nullhost(t)) 6320 t.s_addr = pd->src->v4.s_addr; 6321 6322 /* 6323 * We hold the state lock (idhash) here, which means 6324 * that we can't acquire the keyhash, or we'll get a 6325 * LOR (and potentially double-lock things too). We also 6326 * can't release the state lock here, so instead we'll 6327 * enqueue this for async handling. 6328 * There's a relatively small race here, in that a 6329 * packet using the new addresses could arrive already, 6330 * but that's just though luck for it. 6331 */ 6332 job = malloc(sizeof(*job), M_PFTEMP, M_NOWAIT | M_ZERO); 6333 if (! job) 6334 return (PF_DROP); 6335 6336 memcpy(&job->pd, pd, sizeof(*pd)); 6337 6338 // New source address! 6339 memcpy(&job->src, &t, sizeof(t)); 6340 job->pd.src = &job->src; 6341 memcpy(&job->dst, pd->dst, sizeof(job->dst)); 6342 job->pd.dst = &job->dst; 6343 job->m = m; 6344 job->op = op; 6345 6346 TAILQ_INSERT_TAIL(&pd->sctp_multihome_jobs, job, next); 6347 break; 6348 } 6349 #ifdef INET6 6350 case SCTP_IPV6_ADDRESS: { 6351 struct in6_addr t; 6352 6353 if (ntohs(h.param_length) != 6354 (sizeof(struct sctp_paramhdr) + sizeof(t))) 6355 return (PF_DROP); 6356 6357 if (!pf_pull_hdr(m, start + off + sizeof(h), &t, sizeof(t), 6358 NULL, NULL, pd->af)) 6359 return (PF_DROP); 6360 if (memcmp(&t, &pd->src->v6, sizeof(t)) == 0) 6361 break; 6362 if (memcmp(&t, &in6addr_any, sizeof(t)) == 0) 6363 memcpy(&t, &pd->src->v6, sizeof(t)); 6364 6365 job = malloc(sizeof(*job), M_PFTEMP, M_NOWAIT | M_ZERO); 6366 if (! job) 6367 return (PF_DROP); 6368 6369 memcpy(&job->pd, pd, sizeof(*pd)); 6370 memcpy(&job->src, &t, sizeof(t)); 6371 job->pd.src = &job->src; 6372 memcpy(&job->dst, pd->dst, sizeof(job->dst)); 6373 job->pd.dst = &job->dst; 6374 job->m = m; 6375 job->op = op; 6376 6377 TAILQ_INSERT_TAIL(&pd->sctp_multihome_jobs, job, next); 6378 break; 6379 } 6380 #endif 6381 case SCTP_ADD_IP_ADDRESS: { 6382 int ret; 6383 struct sctp_asconf_paramhdr ah; 6384 6385 if (!pf_pull_hdr(m, start + off, &ah, sizeof(ah), 6386 NULL, NULL, pd->af)) 6387 return (PF_DROP); 6388 6389 ret = pf_multihome_scan(m, start + off + sizeof(ah), 6390 ntohs(ah.ph.param_length) - sizeof(ah), pd, kif, 6391 SCTP_ADD_IP_ADDRESS); 6392 if (ret != PF_PASS) 6393 return (ret); 6394 break; 6395 } 6396 case SCTP_DEL_IP_ADDRESS: { 6397 int ret; 6398 struct sctp_asconf_paramhdr ah; 6399 6400 if (!pf_pull_hdr(m, start + off, &ah, sizeof(ah), 6401 NULL, NULL, pd->af)) 6402 return (PF_DROP); 6403 ret = pf_multihome_scan(m, start + off + sizeof(ah), 6404 ntohs(ah.ph.param_length) - sizeof(ah), pd, kif, 6405 SCTP_DEL_IP_ADDRESS); 6406 if (ret != PF_PASS) 6407 return (ret); 6408 break; 6409 } 6410 default: 6411 break; 6412 } 6413 6414 off += roundup(ntohs(h.param_length), 4); 6415 } 6416 6417 return (PF_PASS); 6418 } 6419 int 6420 pf_multihome_scan_init(struct mbuf *m, int start, int len, struct pf_pdesc *pd, 6421 struct pfi_kkif *kif) 6422 { 6423 start += sizeof(struct sctp_init_chunk); 6424 len -= sizeof(struct sctp_init_chunk); 6425 6426 return (pf_multihome_scan(m, start, len, pd, kif, SCTP_ADD_IP_ADDRESS)); 6427 } 6428 6429 int 6430 pf_multihome_scan_asconf(struct mbuf *m, int start, int len, 6431 struct pf_pdesc *pd, struct pfi_kkif *kif) 6432 { 6433 start += sizeof(struct sctp_asconf_chunk); 6434 len -= sizeof(struct sctp_asconf_chunk); 6435 6436 return (pf_multihome_scan(m, start, len, pd, kif, SCTP_ADD_IP_ADDRESS)); 6437 } 6438 6439 static int 6440 pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, 6441 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 6442 { 6443 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 6444 u_int16_t icmpid = 0, *icmpsum; 6445 u_int8_t icmptype, icmpcode; 6446 int state_icmp = 0; 6447 struct pf_state_key_cmp key; 6448 6449 bzero(&key, sizeof(key)); 6450 switch (pd->proto) { 6451 #ifdef INET 6452 case IPPROTO_ICMP: 6453 icmptype = pd->hdr.icmp.icmp_type; 6454 icmpcode = pd->hdr.icmp.icmp_code; 6455 icmpid = pd->hdr.icmp.icmp_id; 6456 icmpsum = &pd->hdr.icmp.icmp_cksum; 6457 6458 if (icmptype == ICMP_UNREACH || 6459 icmptype == ICMP_SOURCEQUENCH || 6460 icmptype == ICMP_REDIRECT || 6461 icmptype == ICMP_TIMXCEED || 6462 icmptype == ICMP_PARAMPROB) 6463 state_icmp++; 6464 break; 6465 #endif /* INET */ 6466 #ifdef INET6 6467 case IPPROTO_ICMPV6: 6468 icmptype = pd->hdr.icmp6.icmp6_type; 6469 icmpcode = pd->hdr.icmp6.icmp6_code; 6470 icmpid = pd->hdr.icmp6.icmp6_id; 6471 icmpsum = &pd->hdr.icmp6.icmp6_cksum; 6472 6473 if (icmptype == ICMP6_DST_UNREACH || 6474 icmptype == ICMP6_PACKET_TOO_BIG || 6475 icmptype == ICMP6_TIME_EXCEEDED || 6476 icmptype == ICMP6_PARAM_PROB) 6477 state_icmp++; 6478 break; 6479 #endif /* INET6 */ 6480 } 6481 6482 if (!state_icmp) { 6483 /* 6484 * ICMP query/reply message not related to a TCP/UDP packet. 6485 * Search for an ICMP state. 6486 */ 6487 key.af = pd->af; 6488 key.proto = pd->proto; 6489 key.port[0] = key.port[1] = icmpid; 6490 if (pd->dir == PF_IN) { /* wire side, straight */ 6491 PF_ACPY(&key.addr[0], pd->src, key.af); 6492 PF_ACPY(&key.addr[1], pd->dst, key.af); 6493 } else { /* stack side, reverse */ 6494 PF_ACPY(&key.addr[1], pd->src, key.af); 6495 PF_ACPY(&key.addr[0], pd->dst, key.af); 6496 } 6497 6498 STATE_LOOKUP(kif, &key, *state, pd); 6499 6500 (*state)->expire = pf_get_uptime(); 6501 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 6502 6503 /* translate source/destination address, if necessary */ 6504 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 6505 struct pf_state_key *nk = (*state)->key[pd->didx]; 6506 6507 switch (pd->af) { 6508 #ifdef INET 6509 case AF_INET: 6510 if (PF_ANEQ(pd->src, 6511 &nk->addr[pd->sidx], AF_INET)) 6512 pf_change_a(&saddr->v4.s_addr, 6513 pd->ip_sum, 6514 nk->addr[pd->sidx].v4.s_addr, 0); 6515 6516 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 6517 AF_INET)) 6518 pf_change_a(&daddr->v4.s_addr, 6519 pd->ip_sum, 6520 nk->addr[pd->didx].v4.s_addr, 0); 6521 6522 if (nk->port[0] != 6523 pd->hdr.icmp.icmp_id) { 6524 pd->hdr.icmp.icmp_cksum = 6525 pf_cksum_fixup( 6526 pd->hdr.icmp.icmp_cksum, icmpid, 6527 nk->port[pd->sidx], 0); 6528 pd->hdr.icmp.icmp_id = 6529 nk->port[pd->sidx]; 6530 } 6531 6532 m_copyback(m, off, ICMP_MINLEN, 6533 (caddr_t )&pd->hdr.icmp); 6534 break; 6535 #endif /* INET */ 6536 #ifdef INET6 6537 case AF_INET6: 6538 if (PF_ANEQ(pd->src, 6539 &nk->addr[pd->sidx], AF_INET6)) 6540 pf_change_a6(saddr, 6541 &pd->hdr.icmp6.icmp6_cksum, 6542 &nk->addr[pd->sidx], 0); 6543 6544 if (PF_ANEQ(pd->dst, 6545 &nk->addr[pd->didx], AF_INET6)) 6546 pf_change_a6(daddr, 6547 &pd->hdr.icmp6.icmp6_cksum, 6548 &nk->addr[pd->didx], 0); 6549 6550 m_copyback(m, off, sizeof(struct icmp6_hdr), 6551 (caddr_t )&pd->hdr.icmp6); 6552 break; 6553 #endif /* INET6 */ 6554 } 6555 } 6556 return (PF_PASS); 6557 6558 } else { 6559 /* 6560 * ICMP error message in response to a TCP/UDP packet. 6561 * Extract the inner TCP/UDP header and search for that state. 6562 */ 6563 6564 struct pf_pdesc pd2; 6565 bzero(&pd2, sizeof pd2); 6566 #ifdef INET 6567 struct ip h2; 6568 #endif /* INET */ 6569 #ifdef INET6 6570 struct ip6_hdr h2_6; 6571 int terminal = 0; 6572 #endif /* INET6 */ 6573 int ipoff2 = 0; 6574 int off2 = 0; 6575 6576 pd2.af = pd->af; 6577 /* Payload packet is from the opposite direction. */ 6578 pd2.sidx = (pd->dir == PF_IN) ? 1 : 0; 6579 pd2.didx = (pd->dir == PF_IN) ? 0 : 1; 6580 switch (pd->af) { 6581 #ifdef INET 6582 case AF_INET: 6583 /* offset of h2 in mbuf chain */ 6584 ipoff2 = off + ICMP_MINLEN; 6585 6586 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 6587 NULL, reason, pd2.af)) { 6588 DPFPRINTF(PF_DEBUG_MISC, 6589 ("pf: ICMP error message too short " 6590 "(ip)\n")); 6591 return (PF_DROP); 6592 } 6593 /* 6594 * ICMP error messages don't refer to non-first 6595 * fragments 6596 */ 6597 if (h2.ip_off & htons(IP_OFFMASK)) { 6598 REASON_SET(reason, PFRES_FRAG); 6599 return (PF_DROP); 6600 } 6601 6602 /* offset of protocol header that follows h2 */ 6603 off2 = ipoff2 + (h2.ip_hl << 2); 6604 6605 pd2.proto = h2.ip_p; 6606 pd2.src = (struct pf_addr *)&h2.ip_src; 6607 pd2.dst = (struct pf_addr *)&h2.ip_dst; 6608 pd2.ip_sum = &h2.ip_sum; 6609 break; 6610 #endif /* INET */ 6611 #ifdef INET6 6612 case AF_INET6: 6613 ipoff2 = off + sizeof(struct icmp6_hdr); 6614 6615 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 6616 NULL, reason, pd2.af)) { 6617 DPFPRINTF(PF_DEBUG_MISC, 6618 ("pf: ICMP error message too short " 6619 "(ip6)\n")); 6620 return (PF_DROP); 6621 } 6622 pd2.proto = h2_6.ip6_nxt; 6623 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 6624 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 6625 pd2.ip_sum = NULL; 6626 off2 = ipoff2 + sizeof(h2_6); 6627 do { 6628 switch (pd2.proto) { 6629 case IPPROTO_FRAGMENT: 6630 /* 6631 * ICMPv6 error messages for 6632 * non-first fragments 6633 */ 6634 REASON_SET(reason, PFRES_FRAG); 6635 return (PF_DROP); 6636 case IPPROTO_AH: 6637 case IPPROTO_HOPOPTS: 6638 case IPPROTO_ROUTING: 6639 case IPPROTO_DSTOPTS: { 6640 /* get next header and header length */ 6641 struct ip6_ext opt6; 6642 6643 if (!pf_pull_hdr(m, off2, &opt6, 6644 sizeof(opt6), NULL, reason, 6645 pd2.af)) { 6646 DPFPRINTF(PF_DEBUG_MISC, 6647 ("pf: ICMPv6 short opt\n")); 6648 return (PF_DROP); 6649 } 6650 if (pd2.proto == IPPROTO_AH) 6651 off2 += (opt6.ip6e_len + 2) * 4; 6652 else 6653 off2 += (opt6.ip6e_len + 1) * 8; 6654 pd2.proto = opt6.ip6e_nxt; 6655 /* goto the next header */ 6656 break; 6657 } 6658 default: 6659 terminal++; 6660 break; 6661 } 6662 } while (!terminal); 6663 break; 6664 #endif /* INET6 */ 6665 } 6666 6667 if (PF_ANEQ(pd->dst, pd2.src, pd->af)) { 6668 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6669 printf("pf: BAD ICMP %d:%d outer dst: ", 6670 icmptype, icmpcode); 6671 pf_print_host(pd->src, 0, pd->af); 6672 printf(" -> "); 6673 pf_print_host(pd->dst, 0, pd->af); 6674 printf(" inner src: "); 6675 pf_print_host(pd2.src, 0, pd2.af); 6676 printf(" -> "); 6677 pf_print_host(pd2.dst, 0, pd2.af); 6678 printf("\n"); 6679 } 6680 REASON_SET(reason, PFRES_BADSTATE); 6681 return (PF_DROP); 6682 } 6683 6684 switch (pd2.proto) { 6685 case IPPROTO_TCP: { 6686 struct tcphdr th; 6687 u_int32_t seq; 6688 struct pf_state_peer *src, *dst; 6689 u_int8_t dws; 6690 int copyback = 0; 6691 6692 /* 6693 * Only the first 8 bytes of the TCP header can be 6694 * expected. Don't access any TCP header fields after 6695 * th_seq, an ackskew test is not possible. 6696 */ 6697 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 6698 pd2.af)) { 6699 DPFPRINTF(PF_DEBUG_MISC, 6700 ("pf: ICMP error message too short " 6701 "(tcp)\n")); 6702 return (PF_DROP); 6703 } 6704 6705 key.af = pd2.af; 6706 key.proto = IPPROTO_TCP; 6707 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6708 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6709 key.port[pd2.sidx] = th.th_sport; 6710 key.port[pd2.didx] = th.th_dport; 6711 6712 STATE_LOOKUP(kif, &key, *state, pd); 6713 6714 if (pd->dir == (*state)->direction) { 6715 src = &(*state)->dst; 6716 dst = &(*state)->src; 6717 } else { 6718 src = &(*state)->src; 6719 dst = &(*state)->dst; 6720 } 6721 6722 if (src->wscale && dst->wscale) 6723 dws = dst->wscale & PF_WSCALE_MASK; 6724 else 6725 dws = 0; 6726 6727 /* Demodulate sequence number */ 6728 seq = ntohl(th.th_seq) - src->seqdiff; 6729 if (src->seqdiff) { 6730 pf_change_a(&th.th_seq, icmpsum, 6731 htonl(seq), 0); 6732 copyback = 1; 6733 } 6734 6735 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 6736 (!SEQ_GEQ(src->seqhi, seq) || 6737 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 6738 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6739 printf("pf: BAD ICMP %d:%d ", 6740 icmptype, icmpcode); 6741 pf_print_host(pd->src, 0, pd->af); 6742 printf(" -> "); 6743 pf_print_host(pd->dst, 0, pd->af); 6744 printf(" state: "); 6745 pf_print_state(*state); 6746 printf(" seq=%u\n", seq); 6747 } 6748 REASON_SET(reason, PFRES_BADSTATE); 6749 return (PF_DROP); 6750 } else { 6751 if (V_pf_status.debug >= PF_DEBUG_MISC) { 6752 printf("pf: OK ICMP %d:%d ", 6753 icmptype, icmpcode); 6754 pf_print_host(pd->src, 0, pd->af); 6755 printf(" -> "); 6756 pf_print_host(pd->dst, 0, pd->af); 6757 printf(" state: "); 6758 pf_print_state(*state); 6759 printf(" seq=%u\n", seq); 6760 } 6761 } 6762 6763 /* translate source/destination address, if necessary */ 6764 if ((*state)->key[PF_SK_WIRE] != 6765 (*state)->key[PF_SK_STACK]) { 6766 struct pf_state_key *nk = 6767 (*state)->key[pd->didx]; 6768 6769 if (PF_ANEQ(pd2.src, 6770 &nk->addr[pd2.sidx], pd2.af) || 6771 nk->port[pd2.sidx] != th.th_sport) 6772 pf_change_icmp(pd2.src, &th.th_sport, 6773 daddr, &nk->addr[pd2.sidx], 6774 nk->port[pd2.sidx], NULL, 6775 pd2.ip_sum, icmpsum, 6776 pd->ip_sum, 0, pd2.af); 6777 6778 if (PF_ANEQ(pd2.dst, 6779 &nk->addr[pd2.didx], pd2.af) || 6780 nk->port[pd2.didx] != th.th_dport) 6781 pf_change_icmp(pd2.dst, &th.th_dport, 6782 saddr, &nk->addr[pd2.didx], 6783 nk->port[pd2.didx], NULL, 6784 pd2.ip_sum, icmpsum, 6785 pd->ip_sum, 0, pd2.af); 6786 copyback = 1; 6787 } 6788 6789 if (copyback) { 6790 switch (pd2.af) { 6791 #ifdef INET 6792 case AF_INET: 6793 m_copyback(m, off, ICMP_MINLEN, 6794 (caddr_t )&pd->hdr.icmp); 6795 m_copyback(m, ipoff2, sizeof(h2), 6796 (caddr_t )&h2); 6797 break; 6798 #endif /* INET */ 6799 #ifdef INET6 6800 case AF_INET6: 6801 m_copyback(m, off, 6802 sizeof(struct icmp6_hdr), 6803 (caddr_t )&pd->hdr.icmp6); 6804 m_copyback(m, ipoff2, sizeof(h2_6), 6805 (caddr_t )&h2_6); 6806 break; 6807 #endif /* INET6 */ 6808 } 6809 m_copyback(m, off2, 8, (caddr_t)&th); 6810 } 6811 6812 return (PF_PASS); 6813 break; 6814 } 6815 case IPPROTO_UDP: { 6816 struct udphdr uh; 6817 6818 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 6819 NULL, reason, pd2.af)) { 6820 DPFPRINTF(PF_DEBUG_MISC, 6821 ("pf: ICMP error message too short " 6822 "(udp)\n")); 6823 return (PF_DROP); 6824 } 6825 6826 key.af = pd2.af; 6827 key.proto = IPPROTO_UDP; 6828 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6829 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6830 key.port[pd2.sidx] = uh.uh_sport; 6831 key.port[pd2.didx] = uh.uh_dport; 6832 6833 STATE_LOOKUP(kif, &key, *state, pd); 6834 6835 /* translate source/destination address, if necessary */ 6836 if ((*state)->key[PF_SK_WIRE] != 6837 (*state)->key[PF_SK_STACK]) { 6838 struct pf_state_key *nk = 6839 (*state)->key[pd->didx]; 6840 6841 if (PF_ANEQ(pd2.src, 6842 &nk->addr[pd2.sidx], pd2.af) || 6843 nk->port[pd2.sidx] != uh.uh_sport) 6844 pf_change_icmp(pd2.src, &uh.uh_sport, 6845 daddr, &nk->addr[pd2.sidx], 6846 nk->port[pd2.sidx], &uh.uh_sum, 6847 pd2.ip_sum, icmpsum, 6848 pd->ip_sum, 1, pd2.af); 6849 6850 if (PF_ANEQ(pd2.dst, 6851 &nk->addr[pd2.didx], pd2.af) || 6852 nk->port[pd2.didx] != uh.uh_dport) 6853 pf_change_icmp(pd2.dst, &uh.uh_dport, 6854 saddr, &nk->addr[pd2.didx], 6855 nk->port[pd2.didx], &uh.uh_sum, 6856 pd2.ip_sum, icmpsum, 6857 pd->ip_sum, 1, pd2.af); 6858 6859 switch (pd2.af) { 6860 #ifdef INET 6861 case AF_INET: 6862 m_copyback(m, off, ICMP_MINLEN, 6863 (caddr_t )&pd->hdr.icmp); 6864 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 6865 break; 6866 #endif /* INET */ 6867 #ifdef INET6 6868 case AF_INET6: 6869 m_copyback(m, off, 6870 sizeof(struct icmp6_hdr), 6871 (caddr_t )&pd->hdr.icmp6); 6872 m_copyback(m, ipoff2, sizeof(h2_6), 6873 (caddr_t )&h2_6); 6874 break; 6875 #endif /* INET6 */ 6876 } 6877 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 6878 } 6879 return (PF_PASS); 6880 break; 6881 } 6882 #ifdef INET 6883 case IPPROTO_ICMP: { 6884 struct icmp iih; 6885 6886 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 6887 NULL, reason, pd2.af)) { 6888 DPFPRINTF(PF_DEBUG_MISC, 6889 ("pf: ICMP error message too short i" 6890 "(icmp)\n")); 6891 return (PF_DROP); 6892 } 6893 6894 key.af = pd2.af; 6895 key.proto = IPPROTO_ICMP; 6896 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6897 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6898 key.port[0] = key.port[1] = iih.icmp_id; 6899 6900 STATE_LOOKUP(kif, &key, *state, pd); 6901 6902 /* translate source/destination address, if necessary */ 6903 if ((*state)->key[PF_SK_WIRE] != 6904 (*state)->key[PF_SK_STACK]) { 6905 struct pf_state_key *nk = 6906 (*state)->key[pd->didx]; 6907 6908 if (PF_ANEQ(pd2.src, 6909 &nk->addr[pd2.sidx], pd2.af) || 6910 nk->port[pd2.sidx] != iih.icmp_id) 6911 pf_change_icmp(pd2.src, &iih.icmp_id, 6912 daddr, &nk->addr[pd2.sidx], 6913 nk->port[pd2.sidx], NULL, 6914 pd2.ip_sum, icmpsum, 6915 pd->ip_sum, 0, AF_INET); 6916 6917 if (PF_ANEQ(pd2.dst, 6918 &nk->addr[pd2.didx], pd2.af) || 6919 nk->port[pd2.didx] != iih.icmp_id) 6920 pf_change_icmp(pd2.dst, &iih.icmp_id, 6921 saddr, &nk->addr[pd2.didx], 6922 nk->port[pd2.didx], NULL, 6923 pd2.ip_sum, icmpsum, 6924 pd->ip_sum, 0, AF_INET); 6925 6926 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); 6927 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 6928 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 6929 } 6930 return (PF_PASS); 6931 break; 6932 } 6933 #endif /* INET */ 6934 #ifdef INET6 6935 case IPPROTO_ICMPV6: { 6936 struct icmp6_hdr iih; 6937 6938 if (!pf_pull_hdr(m, off2, &iih, 6939 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 6940 DPFPRINTF(PF_DEBUG_MISC, 6941 ("pf: ICMP error message too short " 6942 "(icmp6)\n")); 6943 return (PF_DROP); 6944 } 6945 6946 key.af = pd2.af; 6947 key.proto = IPPROTO_ICMPV6; 6948 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6949 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6950 key.port[0] = key.port[1] = iih.icmp6_id; 6951 6952 STATE_LOOKUP(kif, &key, *state, pd); 6953 6954 /* translate source/destination address, if necessary */ 6955 if ((*state)->key[PF_SK_WIRE] != 6956 (*state)->key[PF_SK_STACK]) { 6957 struct pf_state_key *nk = 6958 (*state)->key[pd->didx]; 6959 6960 if (PF_ANEQ(pd2.src, 6961 &nk->addr[pd2.sidx], pd2.af) || 6962 nk->port[pd2.sidx] != iih.icmp6_id) 6963 pf_change_icmp(pd2.src, &iih.icmp6_id, 6964 daddr, &nk->addr[pd2.sidx], 6965 nk->port[pd2.sidx], NULL, 6966 pd2.ip_sum, icmpsum, 6967 pd->ip_sum, 0, AF_INET6); 6968 6969 if (PF_ANEQ(pd2.dst, 6970 &nk->addr[pd2.didx], pd2.af) || 6971 nk->port[pd2.didx] != iih.icmp6_id) 6972 pf_change_icmp(pd2.dst, &iih.icmp6_id, 6973 saddr, &nk->addr[pd2.didx], 6974 nk->port[pd2.didx], NULL, 6975 pd2.ip_sum, icmpsum, 6976 pd->ip_sum, 0, AF_INET6); 6977 6978 m_copyback(m, off, sizeof(struct icmp6_hdr), 6979 (caddr_t)&pd->hdr.icmp6); 6980 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 6981 m_copyback(m, off2, sizeof(struct icmp6_hdr), 6982 (caddr_t)&iih); 6983 } 6984 return (PF_PASS); 6985 break; 6986 } 6987 #endif /* INET6 */ 6988 default: { 6989 key.af = pd2.af; 6990 key.proto = pd2.proto; 6991 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 6992 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 6993 key.port[0] = key.port[1] = 0; 6994 6995 STATE_LOOKUP(kif, &key, *state, pd); 6996 6997 /* translate source/destination address, if necessary */ 6998 if ((*state)->key[PF_SK_WIRE] != 6999 (*state)->key[PF_SK_STACK]) { 7000 struct pf_state_key *nk = 7001 (*state)->key[pd->didx]; 7002 7003 if (PF_ANEQ(pd2.src, 7004 &nk->addr[pd2.sidx], pd2.af)) 7005 pf_change_icmp(pd2.src, NULL, daddr, 7006 &nk->addr[pd2.sidx], 0, NULL, 7007 pd2.ip_sum, icmpsum, 7008 pd->ip_sum, 0, pd2.af); 7009 7010 if (PF_ANEQ(pd2.dst, 7011 &nk->addr[pd2.didx], pd2.af)) 7012 pf_change_icmp(pd2.dst, NULL, saddr, 7013 &nk->addr[pd2.didx], 0, NULL, 7014 pd2.ip_sum, icmpsum, 7015 pd->ip_sum, 0, pd2.af); 7016 7017 switch (pd2.af) { 7018 #ifdef INET 7019 case AF_INET: 7020 m_copyback(m, off, ICMP_MINLEN, 7021 (caddr_t)&pd->hdr.icmp); 7022 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 7023 break; 7024 #endif /* INET */ 7025 #ifdef INET6 7026 case AF_INET6: 7027 m_copyback(m, off, 7028 sizeof(struct icmp6_hdr), 7029 (caddr_t )&pd->hdr.icmp6); 7030 m_copyback(m, ipoff2, sizeof(h2_6), 7031 (caddr_t )&h2_6); 7032 break; 7033 #endif /* INET6 */ 7034 } 7035 } 7036 return (PF_PASS); 7037 break; 7038 } 7039 } 7040 } 7041 } 7042 7043 static int 7044 pf_test_state_other(struct pf_kstate **state, struct pfi_kkif *kif, 7045 struct mbuf *m, struct pf_pdesc *pd) 7046 { 7047 struct pf_state_peer *src, *dst; 7048 struct pf_state_key_cmp key; 7049 uint8_t psrc, pdst; 7050 7051 bzero(&key, sizeof(key)); 7052 key.af = pd->af; 7053 key.proto = pd->proto; 7054 if (pd->dir == PF_IN) { 7055 PF_ACPY(&key.addr[0], pd->src, key.af); 7056 PF_ACPY(&key.addr[1], pd->dst, key.af); 7057 key.port[0] = key.port[1] = 0; 7058 } else { 7059 PF_ACPY(&key.addr[1], pd->src, key.af); 7060 PF_ACPY(&key.addr[0], pd->dst, key.af); 7061 key.port[1] = key.port[0] = 0; 7062 } 7063 7064 STATE_LOOKUP(kif, &key, *state, pd); 7065 7066 if (pd->dir == (*state)->direction) { 7067 src = &(*state)->src; 7068 dst = &(*state)->dst; 7069 psrc = PF_PEER_SRC; 7070 pdst = PF_PEER_DST; 7071 } else { 7072 src = &(*state)->dst; 7073 dst = &(*state)->src; 7074 psrc = PF_PEER_DST; 7075 pdst = PF_PEER_SRC; 7076 } 7077 7078 /* update states */ 7079 if (src->state < PFOTHERS_SINGLE) 7080 pf_set_protostate(*state, psrc, PFOTHERS_SINGLE); 7081 if (dst->state == PFOTHERS_SINGLE) 7082 pf_set_protostate(*state, pdst, PFOTHERS_MULTIPLE); 7083 7084 /* update expire time */ 7085 (*state)->expire = pf_get_uptime(); 7086 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 7087 (*state)->timeout = PFTM_OTHER_MULTIPLE; 7088 else 7089 (*state)->timeout = PFTM_OTHER_SINGLE; 7090 7091 /* translate source/destination address, if necessary */ 7092 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 7093 struct pf_state_key *nk = (*state)->key[pd->didx]; 7094 7095 KASSERT(nk, ("%s: nk is null", __func__)); 7096 KASSERT(pd, ("%s: pd is null", __func__)); 7097 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 7098 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 7099 switch (pd->af) { 7100 #ifdef INET 7101 case AF_INET: 7102 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 7103 pf_change_a(&pd->src->v4.s_addr, 7104 pd->ip_sum, 7105 nk->addr[pd->sidx].v4.s_addr, 7106 0); 7107 7108 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 7109 pf_change_a(&pd->dst->v4.s_addr, 7110 pd->ip_sum, 7111 nk->addr[pd->didx].v4.s_addr, 7112 0); 7113 7114 break; 7115 #endif /* INET */ 7116 #ifdef INET6 7117 case AF_INET6: 7118 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 7119 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 7120 7121 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 7122 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 7123 #endif /* INET6 */ 7124 } 7125 } 7126 return (PF_PASS); 7127 } 7128 7129 /* 7130 * ipoff and off are measured from the start of the mbuf chain. 7131 * h must be at "ipoff" on the mbuf chain. 7132 */ 7133 void * 7134 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 7135 u_short *actionp, u_short *reasonp, sa_family_t af) 7136 { 7137 switch (af) { 7138 #ifdef INET 7139 case AF_INET: { 7140 struct ip *h = mtod(m, struct ip *); 7141 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 7142 7143 if (fragoff) { 7144 if (fragoff >= len) 7145 ACTION_SET(actionp, PF_PASS); 7146 else { 7147 ACTION_SET(actionp, PF_DROP); 7148 REASON_SET(reasonp, PFRES_FRAG); 7149 } 7150 return (NULL); 7151 } 7152 if (m->m_pkthdr.len < off + len || 7153 ntohs(h->ip_len) < off + len) { 7154 ACTION_SET(actionp, PF_DROP); 7155 REASON_SET(reasonp, PFRES_SHORT); 7156 return (NULL); 7157 } 7158 break; 7159 } 7160 #endif /* INET */ 7161 #ifdef INET6 7162 case AF_INET6: { 7163 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 7164 7165 if (m->m_pkthdr.len < off + len || 7166 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 7167 (unsigned)(off + len)) { 7168 ACTION_SET(actionp, PF_DROP); 7169 REASON_SET(reasonp, PFRES_SHORT); 7170 return (NULL); 7171 } 7172 break; 7173 } 7174 #endif /* INET6 */ 7175 } 7176 m_copydata(m, off, len, p); 7177 return (p); 7178 } 7179 7180 int 7181 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kkif *kif, 7182 int rtableid) 7183 { 7184 struct ifnet *ifp; 7185 7186 /* 7187 * Skip check for addresses with embedded interface scope, 7188 * as they would always match anyway. 7189 */ 7190 if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6)) 7191 return (1); 7192 7193 if (af != AF_INET && af != AF_INET6) 7194 return (0); 7195 7196 if (kif == V_pfi_all) 7197 return (1); 7198 7199 /* Skip checks for ipsec interfaces */ 7200 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 7201 return (1); 7202 7203 ifp = (kif != NULL) ? kif->pfik_ifp : NULL; 7204 7205 switch (af) { 7206 #ifdef INET6 7207 case AF_INET6: 7208 return (fib6_check_urpf(rtableid, &addr->v6, 0, NHR_NONE, 7209 ifp)); 7210 #endif 7211 #ifdef INET 7212 case AF_INET: 7213 return (fib4_check_urpf(rtableid, addr->v4, 0, NHR_NONE, 7214 ifp)); 7215 #endif 7216 } 7217 7218 return (0); 7219 } 7220 7221 #ifdef INET 7222 static void 7223 pf_route(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, 7224 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) 7225 { 7226 struct mbuf *m0, *m1, *md; 7227 struct sockaddr_in dst; 7228 struct ip *ip; 7229 struct pfi_kkif *nkif = NULL; 7230 struct ifnet *ifp = NULL; 7231 struct pf_addr naddr; 7232 struct pf_ksrc_node *sn = NULL; 7233 int error = 0; 7234 uint16_t ip_len, ip_off; 7235 int r_rt, r_dir; 7236 7237 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 7238 7239 if (s) { 7240 r_rt = s->rt; 7241 r_dir = s->direction; 7242 } else { 7243 r_rt = r->rt; 7244 r_dir = r->direction; 7245 } 7246 7247 KASSERT(pd->dir == PF_IN || pd->dir == PF_OUT || 7248 r_dir == PF_IN || r_dir == PF_OUT, ("%s: invalid direction", 7249 __func__)); 7250 7251 if ((pd->pf_mtag == NULL && 7252 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 7253 pd->pf_mtag->routed++ > 3) { 7254 m0 = *m; 7255 *m = NULL; 7256 goto bad_locked; 7257 } 7258 7259 if (r_rt == PF_DUPTO) { 7260 if ((pd->pf_mtag->flags & PF_MTAG_FLAG_DUPLICATED)) { 7261 if (s == NULL) { 7262 ifp = r->rpool.cur->kif ? 7263 r->rpool.cur->kif->pfik_ifp : NULL; 7264 } else { 7265 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7266 /* If pfsync'd */ 7267 if (ifp == NULL && r->rpool.cur != NULL) 7268 ifp = r->rpool.cur->kif ? 7269 r->rpool.cur->kif->pfik_ifp : NULL; 7270 PF_STATE_UNLOCK(s); 7271 } 7272 if (ifp == oifp) { 7273 /* When the 2nd interface is not skipped */ 7274 return; 7275 } else { 7276 m0 = *m; 7277 *m = NULL; 7278 goto bad; 7279 } 7280 } else { 7281 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUPLICATED; 7282 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { 7283 if (s) 7284 PF_STATE_UNLOCK(s); 7285 return; 7286 } 7287 } 7288 } else { 7289 if ((r_rt == PF_REPLYTO) == (r_dir == pd->dir)) { 7290 pf_dummynet(pd, s, r, m); 7291 if (s) 7292 PF_STATE_UNLOCK(s); 7293 return; 7294 } 7295 m0 = *m; 7296 } 7297 7298 ip = mtod(m0, struct ip *); 7299 7300 bzero(&dst, sizeof(dst)); 7301 dst.sin_family = AF_INET; 7302 dst.sin_len = sizeof(dst); 7303 dst.sin_addr = ip->ip_dst; 7304 7305 bzero(&naddr, sizeof(naddr)); 7306 7307 if (s == NULL) { 7308 if (TAILQ_EMPTY(&r->rpool.list)) { 7309 DPFPRINTF(PF_DEBUG_URGENT, 7310 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 7311 goto bad_locked; 7312 } 7313 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 7314 &naddr, &nkif, NULL, &sn); 7315 if (!PF_AZERO(&naddr, AF_INET)) 7316 dst.sin_addr.s_addr = naddr.v4.s_addr; 7317 ifp = nkif ? nkif->pfik_ifp : NULL; 7318 } else { 7319 if (!PF_AZERO(&s->rt_addr, AF_INET)) 7320 dst.sin_addr.s_addr = 7321 s->rt_addr.v4.s_addr; 7322 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7323 /* If pfsync'd */ 7324 if (ifp == NULL && r->rpool.cur != NULL) { 7325 ifp = r->rpool.cur->kif ? 7326 r->rpool.cur->kif->pfik_ifp : NULL; 7327 } 7328 PF_STATE_UNLOCK(s); 7329 } 7330 7331 if (ifp == NULL) 7332 goto bad; 7333 7334 if (pd->dir == PF_IN) { 7335 if (pf_test(PF_OUT, 0, ifp, &m0, inp, &pd->act) != PF_PASS) 7336 goto bad; 7337 else if (m0 == NULL) 7338 goto done; 7339 if (m0->m_len < sizeof(struct ip)) { 7340 DPFPRINTF(PF_DEBUG_URGENT, 7341 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 7342 goto bad; 7343 } 7344 ip = mtod(m0, struct ip *); 7345 } 7346 7347 if (ifp->if_flags & IFF_LOOPBACK) 7348 m0->m_flags |= M_SKIP_FIREWALL; 7349 7350 ip_len = ntohs(ip->ip_len); 7351 ip_off = ntohs(ip->ip_off); 7352 7353 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 7354 m0->m_pkthdr.csum_flags |= CSUM_IP; 7355 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 7356 in_delayed_cksum(m0); 7357 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 7358 } 7359 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 7360 pf_sctp_checksum(m0, (uint32_t)(ip->ip_hl << 2)); 7361 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 7362 } 7363 7364 /* 7365 * If small enough for interface, or the interface will take 7366 * care of the fragmentation for us, we can just send directly. 7367 */ 7368 if (ip_len <= ifp->if_mtu || 7369 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 7370 ip->ip_sum = 0; 7371 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 7372 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 7373 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 7374 } 7375 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 7376 7377 md = m0; 7378 error = pf_dummynet_route(pd, s, r, ifp, sintosa(&dst), &md); 7379 if (md != NULL) 7380 error = (*ifp->if_output)(ifp, md, sintosa(&dst), NULL); 7381 goto done; 7382 } 7383 7384 /* Balk when DF bit is set or the interface didn't support TSO. */ 7385 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 7386 error = EMSGSIZE; 7387 KMOD_IPSTAT_INC(ips_cantfrag); 7388 if (r_rt != PF_DUPTO) { 7389 if (s && pd->nat_rule != NULL) 7390 PACKET_UNDO_NAT(m0, pd, 7391 (ip->ip_hl << 2) + (ip_off & IP_OFFMASK), 7392 s); 7393 7394 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 7395 ifp->if_mtu); 7396 goto done; 7397 } else 7398 goto bad; 7399 } 7400 7401 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 7402 if (error) 7403 goto bad; 7404 7405 for (; m0; m0 = m1) { 7406 m1 = m0->m_nextpkt; 7407 m0->m_nextpkt = NULL; 7408 if (error == 0) { 7409 m_clrprotoflags(m0); 7410 md = m0; 7411 error = pf_dummynet_route(pd, s, r, ifp, 7412 sintosa(&dst), &md); 7413 if (md != NULL) 7414 error = (*ifp->if_output)(ifp, md, 7415 sintosa(&dst), NULL); 7416 } else 7417 m_freem(m0); 7418 } 7419 7420 if (error == 0) 7421 KMOD_IPSTAT_INC(ips_fragmented); 7422 7423 done: 7424 if (r_rt != PF_DUPTO) 7425 *m = NULL; 7426 return; 7427 7428 bad_locked: 7429 if (s) 7430 PF_STATE_UNLOCK(s); 7431 bad: 7432 m_freem(m0); 7433 goto done; 7434 } 7435 #endif /* INET */ 7436 7437 #ifdef INET6 7438 static void 7439 pf_route6(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp, 7440 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) 7441 { 7442 struct mbuf *m0, *md; 7443 struct sockaddr_in6 dst; 7444 struct ip6_hdr *ip6; 7445 struct pfi_kkif *nkif = NULL; 7446 struct ifnet *ifp = NULL; 7447 struct pf_addr naddr; 7448 struct pf_ksrc_node *sn = NULL; 7449 int r_rt, r_dir; 7450 7451 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 7452 7453 if (s) { 7454 r_rt = s->rt; 7455 r_dir = s->direction; 7456 } else { 7457 r_rt = r->rt; 7458 r_dir = r->direction; 7459 } 7460 7461 KASSERT(pd->dir == PF_IN || pd->dir == PF_OUT || 7462 r_dir == PF_IN || r_dir == PF_OUT, ("%s: invalid direction", 7463 __func__)); 7464 7465 if ((pd->pf_mtag == NULL && 7466 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 7467 pd->pf_mtag->routed++ > 3) { 7468 m0 = *m; 7469 *m = NULL; 7470 goto bad_locked; 7471 } 7472 7473 if (r_rt == PF_DUPTO) { 7474 if ((pd->pf_mtag->flags & PF_MTAG_FLAG_DUPLICATED)) { 7475 if (s == NULL) { 7476 ifp = r->rpool.cur->kif ? 7477 r->rpool.cur->kif->pfik_ifp : NULL; 7478 } else { 7479 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7480 /* If pfsync'd */ 7481 if (ifp == NULL && r->rpool.cur != NULL) 7482 ifp = r->rpool.cur->kif ? 7483 r->rpool.cur->kif->pfik_ifp : NULL; 7484 PF_STATE_UNLOCK(s); 7485 } 7486 if (ifp == oifp) { 7487 /* When the 2nd interface is not skipped */ 7488 return; 7489 } else { 7490 m0 = *m; 7491 *m = NULL; 7492 goto bad; 7493 } 7494 } else { 7495 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUPLICATED; 7496 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { 7497 if (s) 7498 PF_STATE_UNLOCK(s); 7499 return; 7500 } 7501 } 7502 } else { 7503 if ((r_rt == PF_REPLYTO) == (r_dir == pd->dir)) { 7504 pf_dummynet(pd, s, r, m); 7505 if (s) 7506 PF_STATE_UNLOCK(s); 7507 return; 7508 } 7509 m0 = *m; 7510 } 7511 7512 ip6 = mtod(m0, struct ip6_hdr *); 7513 7514 bzero(&dst, sizeof(dst)); 7515 dst.sin6_family = AF_INET6; 7516 dst.sin6_len = sizeof(dst); 7517 dst.sin6_addr = ip6->ip6_dst; 7518 7519 bzero(&naddr, sizeof(naddr)); 7520 7521 if (s == NULL) { 7522 if (TAILQ_EMPTY(&r->rpool.list)) { 7523 DPFPRINTF(PF_DEBUG_URGENT, 7524 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 7525 goto bad_locked; 7526 } 7527 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 7528 &naddr, &nkif, NULL, &sn); 7529 if (!PF_AZERO(&naddr, AF_INET6)) 7530 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 7531 &naddr, AF_INET6); 7532 ifp = nkif ? nkif->pfik_ifp : NULL; 7533 } else { 7534 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 7535 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 7536 &s->rt_addr, AF_INET6); 7537 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 7538 /* If pfsync'd */ 7539 if (ifp == NULL && r->rpool.cur != NULL) 7540 ifp = r->rpool.cur->kif ? 7541 r->rpool.cur->kif->pfik_ifp : NULL; 7542 } 7543 7544 if (s) 7545 PF_STATE_UNLOCK(s); 7546 7547 if (ifp == NULL) 7548 goto bad; 7549 7550 if (pd->dir == PF_IN) { 7551 if (pf_test6(PF_OUT, 0, ifp, &m0, inp, &pd->act) != PF_PASS) 7552 goto bad; 7553 else if (m0 == NULL) 7554 goto done; 7555 if (m0->m_len < sizeof(struct ip6_hdr)) { 7556 DPFPRINTF(PF_DEBUG_URGENT, 7557 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 7558 __func__)); 7559 goto bad; 7560 } 7561 ip6 = mtod(m0, struct ip6_hdr *); 7562 } 7563 7564 if (ifp->if_flags & IFF_LOOPBACK) 7565 m0->m_flags |= M_SKIP_FIREWALL; 7566 7567 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 & 7568 ~ifp->if_hwassist) { 7569 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6); 7570 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr)); 7571 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 7572 } 7573 7574 /* 7575 * If the packet is too large for the outgoing interface, 7576 * send back an icmp6 error. 7577 */ 7578 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 7579 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 7580 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 7581 md = m0; 7582 pf_dummynet_route(pd, s, r, ifp, sintosa(&dst), &md); 7583 if (md != NULL) 7584 nd6_output_ifp(ifp, ifp, md, &dst, NULL); 7585 } 7586 else { 7587 in6_ifstat_inc(ifp, ifs6_in_toobig); 7588 if (r_rt != PF_DUPTO) { 7589 if (s && pd->nat_rule != NULL) 7590 PACKET_UNDO_NAT(m0, pd, 7591 ((caddr_t)ip6 - m0->m_data) + 7592 sizeof(struct ip6_hdr), s); 7593 7594 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 7595 } else 7596 goto bad; 7597 } 7598 7599 done: 7600 if (r_rt != PF_DUPTO) 7601 *m = NULL; 7602 return; 7603 7604 bad_locked: 7605 if (s) 7606 PF_STATE_UNLOCK(s); 7607 bad: 7608 m_freem(m0); 7609 goto done; 7610 } 7611 #endif /* INET6 */ 7612 7613 /* 7614 * FreeBSD supports cksum offloads for the following drivers. 7615 * em(4), fxp(4), lge(4), nge(4), re(4), ti(4), txp(4), xl(4) 7616 * 7617 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 7618 * network driver performed cksum including pseudo header, need to verify 7619 * csum_data 7620 * CSUM_DATA_VALID : 7621 * network driver performed cksum, needs to additional pseudo header 7622 * cksum computation with partial csum_data(i.e. lack of H/W support for 7623 * pseudo header, for instance sk(4) and possibly gem(4)) 7624 * 7625 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 7626 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 7627 * TCP/UDP layer. 7628 * Also, set csum_data to 0xffff to force cksum validation. 7629 */ 7630 static int 7631 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 7632 { 7633 u_int16_t sum = 0; 7634 int hw_assist = 0; 7635 struct ip *ip; 7636 7637 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 7638 return (1); 7639 if (m->m_pkthdr.len < off + len) 7640 return (1); 7641 7642 switch (p) { 7643 case IPPROTO_TCP: 7644 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 7645 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 7646 sum = m->m_pkthdr.csum_data; 7647 } else { 7648 ip = mtod(m, struct ip *); 7649 sum = in_pseudo(ip->ip_src.s_addr, 7650 ip->ip_dst.s_addr, htonl((u_short)len + 7651 m->m_pkthdr.csum_data + IPPROTO_TCP)); 7652 } 7653 sum ^= 0xffff; 7654 ++hw_assist; 7655 } 7656 break; 7657 case IPPROTO_UDP: 7658 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 7659 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 7660 sum = m->m_pkthdr.csum_data; 7661 } else { 7662 ip = mtod(m, struct ip *); 7663 sum = in_pseudo(ip->ip_src.s_addr, 7664 ip->ip_dst.s_addr, htonl((u_short)len + 7665 m->m_pkthdr.csum_data + IPPROTO_UDP)); 7666 } 7667 sum ^= 0xffff; 7668 ++hw_assist; 7669 } 7670 break; 7671 case IPPROTO_ICMP: 7672 #ifdef INET6 7673 case IPPROTO_ICMPV6: 7674 #endif /* INET6 */ 7675 break; 7676 default: 7677 return (1); 7678 } 7679 7680 if (!hw_assist) { 7681 switch (af) { 7682 case AF_INET: 7683 if (p == IPPROTO_ICMP) { 7684 if (m->m_len < off) 7685 return (1); 7686 m->m_data += off; 7687 m->m_len -= off; 7688 sum = in_cksum(m, len); 7689 m->m_data -= off; 7690 m->m_len += off; 7691 } else { 7692 if (m->m_len < sizeof(struct ip)) 7693 return (1); 7694 sum = in4_cksum(m, p, off, len); 7695 } 7696 break; 7697 #ifdef INET6 7698 case AF_INET6: 7699 if (m->m_len < sizeof(struct ip6_hdr)) 7700 return (1); 7701 sum = in6_cksum(m, p, off, len); 7702 break; 7703 #endif /* INET6 */ 7704 default: 7705 return (1); 7706 } 7707 } 7708 if (sum) { 7709 switch (p) { 7710 case IPPROTO_TCP: 7711 { 7712 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 7713 break; 7714 } 7715 case IPPROTO_UDP: 7716 { 7717 KMOD_UDPSTAT_INC(udps_badsum); 7718 break; 7719 } 7720 #ifdef INET 7721 case IPPROTO_ICMP: 7722 { 7723 KMOD_ICMPSTAT_INC(icps_checksum); 7724 break; 7725 } 7726 #endif 7727 #ifdef INET6 7728 case IPPROTO_ICMPV6: 7729 { 7730 KMOD_ICMP6STAT_INC(icp6s_checksum); 7731 break; 7732 } 7733 #endif /* INET6 */ 7734 } 7735 return (1); 7736 } else { 7737 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 7738 m->m_pkthdr.csum_flags |= 7739 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 7740 m->m_pkthdr.csum_data = 0xffff; 7741 } 7742 } 7743 return (0); 7744 } 7745 7746 static bool 7747 pf_pdesc_to_dnflow(const struct pf_pdesc *pd, const struct pf_krule *r, 7748 const struct pf_kstate *s, struct ip_fw_args *dnflow) 7749 { 7750 int dndir = r->direction; 7751 7752 if (s && dndir == PF_INOUT) { 7753 dndir = s->direction; 7754 } else if (dndir == PF_INOUT) { 7755 /* Assume primary direction. Happens when we've set dnpipe in 7756 * the ethernet level code. */ 7757 dndir = pd->dir; 7758 } 7759 7760 memset(dnflow, 0, sizeof(*dnflow)); 7761 7762 if (pd->dport != NULL) 7763 dnflow->f_id.dst_port = ntohs(*pd->dport); 7764 if (pd->sport != NULL) 7765 dnflow->f_id.src_port = ntohs(*pd->sport); 7766 7767 if (pd->dir == PF_IN) 7768 dnflow->flags |= IPFW_ARGS_IN; 7769 else 7770 dnflow->flags |= IPFW_ARGS_OUT; 7771 7772 if (pd->dir != dndir && pd->act.dnrpipe) { 7773 dnflow->rule.info = pd->act.dnrpipe; 7774 } 7775 else if (pd->dir == dndir && pd->act.dnpipe) { 7776 dnflow->rule.info = pd->act.dnpipe; 7777 } 7778 else { 7779 return (false); 7780 } 7781 7782 dnflow->rule.info |= IPFW_IS_DUMMYNET; 7783 if (r->free_flags & PFRULE_DN_IS_PIPE || pd->act.flags & PFSTATE_DN_IS_PIPE) 7784 dnflow->rule.info |= IPFW_IS_PIPE; 7785 7786 dnflow->f_id.proto = pd->proto; 7787 dnflow->f_id.extra = dnflow->rule.info; 7788 switch (pd->af) { 7789 case AF_INET: 7790 dnflow->f_id.addr_type = 4; 7791 dnflow->f_id.src_ip = ntohl(pd->src->v4.s_addr); 7792 dnflow->f_id.dst_ip = ntohl(pd->dst->v4.s_addr); 7793 break; 7794 case AF_INET6: 7795 dnflow->flags |= IPFW_ARGS_IP6; 7796 dnflow->f_id.addr_type = 6; 7797 dnflow->f_id.src_ip6 = pd->src->v6; 7798 dnflow->f_id.dst_ip6 = pd->dst->v6; 7799 break; 7800 default: 7801 panic("Invalid AF"); 7802 break; 7803 } 7804 7805 return (true); 7806 } 7807 7808 int 7809 pf_test_eth(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, 7810 struct inpcb *inp) 7811 { 7812 struct pfi_kkif *kif; 7813 struct mbuf *m = *m0; 7814 7815 M_ASSERTPKTHDR(m); 7816 MPASS(ifp->if_vnet == curvnet); 7817 NET_EPOCH_ASSERT(); 7818 7819 if (!V_pf_status.running) 7820 return (PF_PASS); 7821 7822 kif = (struct pfi_kkif *)ifp->if_pf_kif; 7823 7824 if (kif == NULL) { 7825 DPFPRINTF(PF_DEBUG_URGENT, 7826 ("%s: kif == NULL, if_xname %s\n", __func__, ifp->if_xname)); 7827 return (PF_DROP); 7828 } 7829 if (kif->pfik_flags & PFI_IFLAG_SKIP) 7830 return (PF_PASS); 7831 7832 if (m->m_flags & M_SKIP_FIREWALL) 7833 return (PF_PASS); 7834 7835 /* Stateless! */ 7836 return (pf_test_eth_rule(dir, kif, m0)); 7837 } 7838 7839 static __inline void 7840 pf_dummynet_flag_remove(struct mbuf *m, struct pf_mtag *pf_mtag) 7841 { 7842 struct m_tag *mtag; 7843 7844 pf_mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET; 7845 7846 /* dummynet adds this tag, but pf does not need it, 7847 * and keeping it creates unexpected behavior, 7848 * e.g. in case of divert(4) usage right after dummynet. */ 7849 mtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL); 7850 if (mtag != NULL) 7851 m_tag_delete(m, mtag); 7852 } 7853 7854 static int 7855 pf_dummynet(struct pf_pdesc *pd, struct pf_kstate *s, 7856 struct pf_krule *r, struct mbuf **m0) 7857 { 7858 return (pf_dummynet_route(pd, s, r, NULL, NULL, m0)); 7859 } 7860 7861 static int 7862 pf_dummynet_route(struct pf_pdesc *pd, struct pf_kstate *s, 7863 struct pf_krule *r, struct ifnet *ifp, struct sockaddr *sa, 7864 struct mbuf **m0) 7865 { 7866 NET_EPOCH_ASSERT(); 7867 7868 if (pd->act.dnpipe || pd->act.dnrpipe) { 7869 struct ip_fw_args dnflow; 7870 if (ip_dn_io_ptr == NULL) { 7871 m_freem(*m0); 7872 *m0 = NULL; 7873 return (ENOMEM); 7874 } 7875 7876 if (pd->pf_mtag == NULL && 7877 ((pd->pf_mtag = pf_get_mtag(*m0)) == NULL)) { 7878 m_freem(*m0); 7879 *m0 = NULL; 7880 return (ENOMEM); 7881 } 7882 7883 if (ifp != NULL) { 7884 pd->pf_mtag->flags |= PF_MTAG_FLAG_ROUTE_TO; 7885 7886 pd->pf_mtag->if_index = ifp->if_index; 7887 pd->pf_mtag->if_idxgen = ifp->if_idxgen; 7888 7889 MPASS(sa != NULL); 7890 7891 if (pd->af == AF_INET) 7892 memcpy(&pd->pf_mtag->dst, sa, 7893 sizeof(struct sockaddr_in)); 7894 else 7895 memcpy(&pd->pf_mtag->dst, sa, 7896 sizeof(struct sockaddr_in6)); 7897 } 7898 7899 if (pf_pdesc_to_dnflow(pd, r, s, &dnflow)) { 7900 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUMMYNET; 7901 ip_dn_io_ptr(m0, &dnflow); 7902 if (*m0 != NULL) { 7903 pd->pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 7904 pf_dummynet_flag_remove(*m0, pd->pf_mtag); 7905 } 7906 } 7907 } 7908 7909 return (0); 7910 } 7911 7912 #ifdef INET 7913 int 7914 pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, 7915 struct inpcb *inp, struct pf_rule_actions *default_actions) 7916 { 7917 struct pfi_kkif *kif; 7918 u_short action, reason = 0; 7919 struct mbuf *m = *m0; 7920 struct ip *h = NULL; 7921 struct m_tag *mtag; 7922 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 7923 struct pf_kstate *s = NULL; 7924 struct pf_kruleset *ruleset = NULL; 7925 struct pf_pdesc pd; 7926 int off, dirndx, use_2nd_queue = 0; 7927 uint16_t tag; 7928 uint8_t rt; 7929 7930 PF_RULES_RLOCK_TRACKER; 7931 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); 7932 M_ASSERTPKTHDR(m); 7933 7934 if (!V_pf_status.running) 7935 return (PF_PASS); 7936 7937 PF_RULES_RLOCK(); 7938 7939 kif = (struct pfi_kkif *)ifp->if_pf_kif; 7940 7941 if (__predict_false(kif == NULL)) { 7942 DPFPRINTF(PF_DEBUG_URGENT, 7943 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 7944 PF_RULES_RUNLOCK(); 7945 return (PF_DROP); 7946 } 7947 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 7948 PF_RULES_RUNLOCK(); 7949 return (PF_PASS); 7950 } 7951 7952 if (m->m_flags & M_SKIP_FIREWALL) { 7953 PF_RULES_RUNLOCK(); 7954 return (PF_PASS); 7955 } 7956 7957 memset(&pd, 0, sizeof(pd)); 7958 TAILQ_INIT(&pd.sctp_multihome_jobs); 7959 if (default_actions != NULL) 7960 memcpy(&pd.act, default_actions, sizeof(pd.act)); 7961 pd.pf_mtag = pf_find_mtag(m); 7962 7963 if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_MTAG_FLAG_ROUTE_TO)) { 7964 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 7965 7966 ifp = ifnet_byindexgen(pd.pf_mtag->if_index, 7967 pd.pf_mtag->if_idxgen); 7968 if (ifp == NULL || ifp->if_flags & IFF_DYING) { 7969 PF_RULES_RUNLOCK(); 7970 m_freem(*m0); 7971 *m0 = NULL; 7972 return (PF_PASS); 7973 } 7974 PF_RULES_RUNLOCK(); 7975 (ifp->if_output)(ifp, m, sintosa(&pd.pf_mtag->dst), NULL); 7976 *m0 = NULL; 7977 return (PF_PASS); 7978 } 7979 7980 if (pd.pf_mtag && pd.pf_mtag->dnpipe) { 7981 pd.act.dnpipe = pd.pf_mtag->dnpipe; 7982 pd.act.flags = pd.pf_mtag->dnflags; 7983 } 7984 7985 if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL && 7986 pd.pf_mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 7987 /* Dummynet re-injects packets after they've 7988 * completed their delay. We've already 7989 * processed them, so pass unconditionally. */ 7990 7991 /* But only once. We may see the packet multiple times (e.g. 7992 * PFIL_IN/PFIL_OUT). */ 7993 pf_dummynet_flag_remove(m, pd.pf_mtag); 7994 PF_RULES_RUNLOCK(); 7995 7996 return (PF_PASS); 7997 } 7998 7999 pd.sport = pd.dport = NULL; 8000 pd.proto_sum = NULL; 8001 pd.dir = dir; 8002 pd.sidx = (dir == PF_IN) ? 0 : 1; 8003 pd.didx = (dir == PF_IN) ? 1 : 0; 8004 pd.af = AF_INET; 8005 pd.act.rtableid = -1; 8006 8007 h = mtod(m, struct ip *); 8008 off = h->ip_hl << 2; 8009 8010 if (__predict_false(ip_divert_ptr != NULL) && 8011 ((mtag = m_tag_locate(m, MTAG_PF_DIVERT, 0, NULL)) != NULL)) { 8012 struct pf_divert_mtag *dt = (struct pf_divert_mtag *)(mtag+1); 8013 if ((dt->idir == PF_DIVERT_MTAG_DIR_IN && dir == PF_IN) || 8014 (dt->idir == PF_DIVERT_MTAG_DIR_OUT && dir == PF_OUT)) { 8015 if (pd.pf_mtag == NULL && 8016 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 8017 action = PF_DROP; 8018 goto done; 8019 } 8020 pd.pf_mtag->flags |= PF_MTAG_FLAG_PACKET_LOOPED; 8021 } 8022 if (pd.pf_mtag && pd.pf_mtag->flags & PF_MTAG_FLAG_FASTFWD_OURS_PRESENT) { 8023 m->m_flags |= M_FASTFWD_OURS; 8024 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_FASTFWD_OURS_PRESENT; 8025 } 8026 m_tag_delete(m, mtag); 8027 8028 mtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL); 8029 if (mtag != NULL) 8030 m_tag_delete(m, mtag); 8031 } else if (pf_normalize_ip(m0, kif, &reason, &pd) != PF_PASS) { 8032 /* We do IP header normalization and packet reassembly here */ 8033 action = PF_DROP; 8034 goto done; 8035 } 8036 m = *m0; /* pf_normalize messes with m0 */ 8037 h = mtod(m, struct ip *); 8038 8039 off = h->ip_hl << 2; 8040 if (off < (int)sizeof(struct ip)) { 8041 action = PF_DROP; 8042 REASON_SET(&reason, PFRES_SHORT); 8043 pd.act.log = PF_LOG_FORCE; 8044 goto done; 8045 } 8046 8047 pd.src = (struct pf_addr *)&h->ip_src; 8048 pd.dst = (struct pf_addr *)&h->ip_dst; 8049 pd.ip_sum = &h->ip_sum; 8050 pd.proto = h->ip_p; 8051 pd.tos = h->ip_tos & ~IPTOS_ECN_MASK; 8052 pd.tot_len = ntohs(h->ip_len); 8053 8054 /* handle fragments that didn't get reassembled by normalization */ 8055 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 8056 action = pf_test_fragment(&r, kif, m, h, &pd, &a, &ruleset); 8057 goto done; 8058 } 8059 8060 switch (h->ip_p) { 8061 case IPPROTO_TCP: { 8062 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), 8063 &action, &reason, AF_INET)) { 8064 if (action != PF_PASS) 8065 pd.act.log = PF_LOG_FORCE; 8066 goto done; 8067 } 8068 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); 8069 8070 pd.sport = &pd.hdr.tcp.th_sport; 8071 pd.dport = &pd.hdr.tcp.th_dport; 8072 8073 /* Respond to SYN with a syncookie. */ 8074 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN && 8075 pd.dir == PF_IN && pf_synflood_check(&pd)) { 8076 pf_syncookie_send(m, off, &pd); 8077 action = PF_DROP; 8078 break; 8079 } 8080 8081 if ((pd.hdr.tcp.th_flags & TH_ACK) && pd.p_len == 0) 8082 use_2nd_queue = 1; 8083 action = pf_normalize_tcp(kif, m, 0, off, h, &pd); 8084 if (action == PF_DROP) 8085 goto done; 8086 action = pf_test_state_tcp(&s, kif, m, off, h, &pd, &reason); 8087 if (action == PF_PASS) { 8088 if (V_pfsync_update_state_ptr != NULL) 8089 V_pfsync_update_state_ptr(s); 8090 r = s->rule.ptr; 8091 a = s->anchor.ptr; 8092 } else if (s == NULL) { 8093 /* Validate remote SYN|ACK, re-create original SYN if 8094 * valid. */ 8095 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == 8096 TH_ACK && pf_syncookie_validate(&pd) && 8097 pd.dir == PF_IN) { 8098 struct mbuf *msyn; 8099 8100 msyn = pf_syncookie_recreate_syn(h->ip_ttl, off, 8101 &pd); 8102 if (msyn == NULL) { 8103 action = PF_DROP; 8104 break; 8105 } 8106 8107 action = pf_test(dir, pflags, ifp, &msyn, inp, 8108 &pd.act); 8109 m_freem(msyn); 8110 if (action != PF_PASS) 8111 break; 8112 8113 action = pf_test_state_tcp(&s, kif, m, off, h, 8114 &pd, &reason); 8115 if (action != PF_PASS || s == NULL) { 8116 action = PF_DROP; 8117 break; 8118 } 8119 8120 s->src.seqhi = ntohl(pd.hdr.tcp.th_ack) - 1; 8121 s->src.seqlo = ntohl(pd.hdr.tcp.th_seq) - 1; 8122 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_DST); 8123 action = pf_synproxy(&pd, &s, &reason); 8124 break; 8125 } else { 8126 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8127 &a, &ruleset, inp); 8128 } 8129 } 8130 break; 8131 } 8132 8133 case IPPROTO_UDP: { 8134 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), 8135 &action, &reason, AF_INET)) { 8136 if (action != PF_PASS) 8137 pd.act.log = PF_LOG_FORCE; 8138 goto done; 8139 } 8140 pd.sport = &pd.hdr.udp.uh_sport; 8141 pd.dport = &pd.hdr.udp.uh_dport; 8142 if (pd.hdr.udp.uh_dport == 0 || 8143 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || 8144 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { 8145 action = PF_DROP; 8146 REASON_SET(&reason, PFRES_SHORT); 8147 goto done; 8148 } 8149 action = pf_test_state_udp(&s, kif, m, off, h, &pd); 8150 if (action == PF_PASS) { 8151 if (V_pfsync_update_state_ptr != NULL) 8152 V_pfsync_update_state_ptr(s); 8153 r = s->rule.ptr; 8154 a = s->anchor.ptr; 8155 } else if (s == NULL) 8156 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8157 &a, &ruleset, inp); 8158 break; 8159 } 8160 8161 case IPPROTO_SCTP: { 8162 if (!pf_pull_hdr(m, off, &pd.hdr.sctp, sizeof(pd.hdr.sctp), 8163 &action, &reason, AF_INET)) { 8164 if (action != PF_PASS) 8165 pd.act.log |= PF_LOG_FORCE; 8166 goto done; 8167 } 8168 pd.p_len = pd.tot_len - off; 8169 8170 pd.sport = &pd.hdr.sctp.src_port; 8171 pd.dport = &pd.hdr.sctp.dest_port; 8172 if (pd.hdr.sctp.src_port == 0 || pd.hdr.sctp.dest_port == 0) { 8173 action = PF_DROP; 8174 REASON_SET(&reason, PFRES_SHORT); 8175 goto done; 8176 } 8177 action = pf_normalize_sctp(dir, kif, m, 0, off, h, &pd); 8178 if (action == PF_DROP) 8179 goto done; 8180 action = pf_test_state_sctp(&s, kif, m, off, h, &pd, 8181 &reason); 8182 if (action == PF_PASS) { 8183 if (V_pfsync_update_state_ptr != NULL) 8184 V_pfsync_update_state_ptr(s); 8185 r = s->rule.ptr; 8186 a = s->anchor.ptr; 8187 } else { 8188 action = pf_test_rule(&r, &s, kif, m, off, 8189 &pd, &a, &ruleset, inp); 8190 } 8191 break; 8192 } 8193 8194 case IPPROTO_ICMP: { 8195 if (!pf_pull_hdr(m, off, &pd.hdr.icmp, ICMP_MINLEN, 8196 &action, &reason, AF_INET)) { 8197 if (action != PF_PASS) 8198 pd.act.log = PF_LOG_FORCE; 8199 goto done; 8200 } 8201 action = pf_test_state_icmp(&s, kif, m, off, h, &pd, &reason); 8202 if (action == PF_PASS) { 8203 if (V_pfsync_update_state_ptr != NULL) 8204 V_pfsync_update_state_ptr(s); 8205 r = s->rule.ptr; 8206 a = s->anchor.ptr; 8207 } else if (s == NULL) 8208 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8209 &a, &ruleset, inp); 8210 break; 8211 } 8212 8213 #ifdef INET6 8214 case IPPROTO_ICMPV6: { 8215 action = PF_DROP; 8216 DPFPRINTF(PF_DEBUG_MISC, 8217 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 8218 goto done; 8219 } 8220 #endif 8221 8222 default: 8223 action = pf_test_state_other(&s, kif, m, &pd); 8224 if (action == PF_PASS) { 8225 if (V_pfsync_update_state_ptr != NULL) 8226 V_pfsync_update_state_ptr(s); 8227 r = s->rule.ptr; 8228 a = s->anchor.ptr; 8229 } else if (s == NULL) 8230 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8231 &a, &ruleset, inp); 8232 break; 8233 } 8234 8235 done: 8236 PF_RULES_RUNLOCK(); 8237 if (action == PF_PASS && h->ip_hl > 5 && 8238 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 8239 action = PF_DROP; 8240 REASON_SET(&reason, PFRES_IPOPTIONS); 8241 pd.act.log = PF_LOG_FORCE; 8242 DPFPRINTF(PF_DEBUG_MISC, 8243 ("pf: dropping packet with ip options\n")); 8244 } 8245 8246 if (s) { 8247 uint8_t log = pd.act.log; 8248 memcpy(&pd.act, &s->act, sizeof(struct pf_rule_actions)); 8249 pd.act.log |= log; 8250 tag = s->tag; 8251 rt = s->rt; 8252 } else { 8253 tag = r->tag; 8254 rt = r->rt; 8255 } 8256 8257 if (tag > 0 && pf_tag_packet(m, &pd, tag)) { 8258 action = PF_DROP; 8259 REASON_SET(&reason, PFRES_MEMORY); 8260 } 8261 8262 pf_scrub_ip(&m, &pd); 8263 if (pd.proto == IPPROTO_TCP && pd.act.max_mss) 8264 pf_normalize_mss(m, off, &pd); 8265 8266 if (pd.act.rtableid >= 0) 8267 M_SETFIB(m, pd.act.rtableid); 8268 8269 if (pd.act.flags & PFSTATE_SETPRIO) { 8270 if (pd.tos & IPTOS_LOWDELAY) 8271 use_2nd_queue = 1; 8272 if (vlan_set_pcp(m, pd.act.set_prio[use_2nd_queue])) { 8273 action = PF_DROP; 8274 REASON_SET(&reason, PFRES_MEMORY); 8275 pd.act.log = PF_LOG_FORCE; 8276 DPFPRINTF(PF_DEBUG_MISC, 8277 ("pf: failed to allocate 802.1q mtag\n")); 8278 } 8279 } 8280 8281 #ifdef ALTQ 8282 if (action == PF_PASS && pd.act.qid) { 8283 if (pd.pf_mtag == NULL && 8284 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 8285 action = PF_DROP; 8286 REASON_SET(&reason, PFRES_MEMORY); 8287 } else { 8288 if (s != NULL) 8289 pd.pf_mtag->qid_hash = pf_state_hash(s); 8290 if (use_2nd_queue || (pd.tos & IPTOS_LOWDELAY)) 8291 pd.pf_mtag->qid = pd.act.pqid; 8292 else 8293 pd.pf_mtag->qid = pd.act.qid; 8294 /* Add hints for ecn. */ 8295 pd.pf_mtag->hdr = h; 8296 } 8297 } 8298 #endif /* ALTQ */ 8299 8300 /* 8301 * connections redirected to loopback should not match sockets 8302 * bound specifically to loopback due to security implications, 8303 * see tcp_input() and in_pcblookup_listen(). 8304 */ 8305 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 8306 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 8307 (s->nat_rule.ptr->action == PF_RDR || 8308 s->nat_rule.ptr->action == PF_BINAT) && 8309 IN_LOOPBACK(ntohl(pd.dst->v4.s_addr))) 8310 m->m_flags |= M_SKIP_FIREWALL; 8311 8312 if (__predict_false(ip_divert_ptr != NULL) && action == PF_PASS && 8313 r->divert.port && !PACKET_LOOPED(&pd)) { 8314 mtag = m_tag_alloc(MTAG_PF_DIVERT, 0, 8315 sizeof(struct pf_divert_mtag), M_NOWAIT | M_ZERO); 8316 if (mtag != NULL) { 8317 ((struct pf_divert_mtag *)(mtag+1))->port = 8318 ntohs(r->divert.port); 8319 ((struct pf_divert_mtag *)(mtag+1))->idir = 8320 (dir == PF_IN) ? PF_DIVERT_MTAG_DIR_IN : 8321 PF_DIVERT_MTAG_DIR_OUT; 8322 8323 if (s) 8324 PF_STATE_UNLOCK(s); 8325 8326 m_tag_prepend(m, mtag); 8327 if (m->m_flags & M_FASTFWD_OURS) { 8328 if (pd.pf_mtag == NULL && 8329 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 8330 action = PF_DROP; 8331 REASON_SET(&reason, PFRES_MEMORY); 8332 pd.act.log = PF_LOG_FORCE; 8333 DPFPRINTF(PF_DEBUG_MISC, 8334 ("pf: failed to allocate tag\n")); 8335 } else { 8336 pd.pf_mtag->flags |= 8337 PF_MTAG_FLAG_FASTFWD_OURS_PRESENT; 8338 m->m_flags &= ~M_FASTFWD_OURS; 8339 } 8340 } 8341 ip_divert_ptr(*m0, dir == PF_IN); 8342 *m0 = NULL; 8343 8344 return (action); 8345 } else { 8346 /* XXX: ipfw has the same behaviour! */ 8347 action = PF_DROP; 8348 REASON_SET(&reason, PFRES_MEMORY); 8349 pd.act.log = PF_LOG_FORCE; 8350 DPFPRINTF(PF_DEBUG_MISC, 8351 ("pf: failed to allocate divert tag\n")); 8352 } 8353 } 8354 /* this flag will need revising if the pkt is forwarded */ 8355 if (pd.pf_mtag) 8356 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_PACKET_LOOPED; 8357 8358 if (pd.act.log) { 8359 struct pf_krule *lr; 8360 struct pf_krule_item *ri; 8361 8362 if (s != NULL && s->nat_rule.ptr != NULL && 8363 s->nat_rule.ptr->log & PF_LOG_ALL) 8364 lr = s->nat_rule.ptr; 8365 else 8366 lr = r; 8367 8368 if (pd.act.log & PF_LOG_FORCE || lr->log & PF_LOG_ALL) 8369 PFLOG_PACKET(kif, m, AF_INET, action, reason, lr, a, 8370 ruleset, &pd, (s == NULL)); 8371 if (s) { 8372 SLIST_FOREACH(ri, &s->match_rules, entry) 8373 if (ri->r->log & PF_LOG_ALL) 8374 PFLOG_PACKET(kif, m, AF_INET, action, 8375 reason, ri->r, a, ruleset, &pd, 0); 8376 } 8377 } 8378 8379 pf_counter_u64_critical_enter(); 8380 pf_counter_u64_add_protected(&kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS], 8381 pd.tot_len); 8382 pf_counter_u64_add_protected(&kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS], 8383 1); 8384 8385 if (action == PF_PASS || r->action == PF_DROP) { 8386 dirndx = (dir == PF_OUT); 8387 pf_counter_u64_add_protected(&r->packets[dirndx], 1); 8388 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); 8389 pf_update_timestamp(r); 8390 8391 if (a != NULL) { 8392 pf_counter_u64_add_protected(&a->packets[dirndx], 1); 8393 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); 8394 } 8395 if (s != NULL) { 8396 struct pf_krule_item *ri; 8397 8398 if (s->nat_rule.ptr != NULL) { 8399 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 8400 1); 8401 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], 8402 pd.tot_len); 8403 } 8404 if (s->src_node != NULL) { 8405 counter_u64_add(s->src_node->packets[dirndx], 8406 1); 8407 counter_u64_add(s->src_node->bytes[dirndx], 8408 pd.tot_len); 8409 } 8410 if (s->nat_src_node != NULL) { 8411 counter_u64_add(s->nat_src_node->packets[dirndx], 8412 1); 8413 counter_u64_add(s->nat_src_node->bytes[dirndx], 8414 pd.tot_len); 8415 } 8416 dirndx = (dir == s->direction) ? 0 : 1; 8417 s->packets[dirndx]++; 8418 s->bytes[dirndx] += pd.tot_len; 8419 SLIST_FOREACH(ri, &s->match_rules, entry) { 8420 pf_counter_u64_add_protected(&ri->r->packets[dirndx], 1); 8421 pf_counter_u64_add_protected(&ri->r->bytes[dirndx], pd.tot_len); 8422 } 8423 } 8424 tr = r; 8425 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 8426 if (nr != NULL && r == &V_pf_default_rule) 8427 tr = nr; 8428 if (tr->src.addr.type == PF_ADDR_TABLE) 8429 pfr_update_stats(tr->src.addr.p.tbl, 8430 (s == NULL) ? pd.src : 8431 &s->key[(s->direction == PF_IN)]-> 8432 addr[(s->direction == PF_OUT)], 8433 pd.af, pd.tot_len, dir == PF_OUT, 8434 r->action == PF_PASS, tr->src.neg); 8435 if (tr->dst.addr.type == PF_ADDR_TABLE) 8436 pfr_update_stats(tr->dst.addr.p.tbl, 8437 (s == NULL) ? pd.dst : 8438 &s->key[(s->direction == PF_IN)]-> 8439 addr[(s->direction == PF_IN)], 8440 pd.af, pd.tot_len, dir == PF_OUT, 8441 r->action == PF_PASS, tr->dst.neg); 8442 } 8443 pf_counter_u64_critical_exit(); 8444 8445 switch (action) { 8446 case PF_SYNPROXY_DROP: 8447 m_freem(*m0); 8448 case PF_DEFER: 8449 *m0 = NULL; 8450 action = PF_PASS; 8451 break; 8452 case PF_DROP: 8453 m_freem(*m0); 8454 *m0 = NULL; 8455 break; 8456 default: 8457 /* pf_route() returns unlocked. */ 8458 if (rt) { 8459 pf_route(m0, r, kif->pfik_ifp, s, &pd, inp); 8460 goto out; 8461 } 8462 if (pf_dummynet(&pd, s, r, m0) != 0) { 8463 action = PF_DROP; 8464 REASON_SET(&reason, PFRES_MEMORY); 8465 } 8466 break; 8467 } 8468 8469 SDT_PROBE4(pf, ip, test, done, action, reason, r, s); 8470 8471 if (s && action != PF_DROP) { 8472 if (!s->if_index_in && dir == PF_IN) 8473 s->if_index_in = ifp->if_index; 8474 else if (!s->if_index_out && dir == PF_OUT) 8475 s->if_index_out = ifp->if_index; 8476 } 8477 8478 if (s) 8479 PF_STATE_UNLOCK(s); 8480 8481 out: 8482 pf_sctp_multihome_delayed(&pd, off, kif, s, action); 8483 8484 return (action); 8485 } 8486 #endif /* INET */ 8487 8488 #ifdef INET6 8489 int 8490 pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp, 8491 struct pf_rule_actions *default_actions) 8492 { 8493 struct pfi_kkif *kif; 8494 u_short action, reason = 0; 8495 struct mbuf *m = *m0, *n = NULL; 8496 struct m_tag *mtag; 8497 struct ip6_hdr *h = NULL; 8498 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 8499 struct pf_kstate *s = NULL; 8500 struct pf_kruleset *ruleset = NULL; 8501 struct pf_pdesc pd; 8502 int off, terminal = 0, dirndx, rh_cnt = 0, use_2nd_queue = 0; 8503 uint16_t tag; 8504 uint8_t rt; 8505 8506 PF_RULES_RLOCK_TRACKER; 8507 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); 8508 M_ASSERTPKTHDR(m); 8509 8510 if (!V_pf_status.running) 8511 return (PF_PASS); 8512 8513 PF_RULES_RLOCK(); 8514 8515 kif = (struct pfi_kkif *)ifp->if_pf_kif; 8516 if (__predict_false(kif == NULL)) { 8517 DPFPRINTF(PF_DEBUG_URGENT, 8518 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 8519 PF_RULES_RUNLOCK(); 8520 return (PF_DROP); 8521 } 8522 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 8523 PF_RULES_RUNLOCK(); 8524 return (PF_PASS); 8525 } 8526 8527 if (m->m_flags & M_SKIP_FIREWALL) { 8528 PF_RULES_RUNLOCK(); 8529 return (PF_PASS); 8530 } 8531 8532 /* 8533 * If we end up changing IP addresses (e.g. binat) the stack may get 8534 * confused and fail to send the icmp6 packet too big error. Just send 8535 * it here, before we do any NAT. 8536 */ 8537 if (dir == PF_OUT && pflags & PFIL_FWD && IN6_LINKMTU(ifp) < pf_max_frag_size(m)) { 8538 PF_RULES_RUNLOCK(); 8539 *m0 = NULL; 8540 icmp6_error(m, ICMP6_PACKET_TOO_BIG, 0, IN6_LINKMTU(ifp)); 8541 return (PF_DROP); 8542 } 8543 8544 memset(&pd, 0, sizeof(pd)); 8545 TAILQ_INIT(&pd.sctp_multihome_jobs); 8546 if (default_actions != NULL) 8547 memcpy(&pd.act, default_actions, sizeof(pd.act)); 8548 pd.pf_mtag = pf_find_mtag(m); 8549 8550 if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_MTAG_FLAG_ROUTE_TO)) { 8551 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO; 8552 8553 ifp = ifnet_byindexgen(pd.pf_mtag->if_index, 8554 pd.pf_mtag->if_idxgen); 8555 if (ifp == NULL || ifp->if_flags & IFF_DYING) { 8556 PF_RULES_RUNLOCK(); 8557 m_freem(*m0); 8558 *m0 = NULL; 8559 return (PF_PASS); 8560 } 8561 PF_RULES_RUNLOCK(); 8562 nd6_output_ifp(ifp, ifp, m, 8563 (struct sockaddr_in6 *)&pd.pf_mtag->dst, NULL); 8564 *m0 = NULL; 8565 return (PF_PASS); 8566 } 8567 8568 if (pd.pf_mtag && pd.pf_mtag->dnpipe) { 8569 pd.act.dnpipe = pd.pf_mtag->dnpipe; 8570 pd.act.flags = pd.pf_mtag->dnflags; 8571 } 8572 8573 if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL && 8574 pd.pf_mtag->flags & PF_MTAG_FLAG_DUMMYNET) { 8575 pf_dummynet_flag_remove(m, pd.pf_mtag); 8576 /* Dummynet re-injects packets after they've 8577 * completed their delay. We've already 8578 * processed them, so pass unconditionally. */ 8579 PF_RULES_RUNLOCK(); 8580 return (PF_PASS); 8581 } 8582 8583 pd.sport = pd.dport = NULL; 8584 pd.ip_sum = NULL; 8585 pd.proto_sum = NULL; 8586 pd.dir = dir; 8587 pd.sidx = (dir == PF_IN) ? 0 : 1; 8588 pd.didx = (dir == PF_IN) ? 1 : 0; 8589 pd.af = AF_INET6; 8590 pd.act.rtableid = -1; 8591 8592 h = mtod(m, struct ip6_hdr *); 8593 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 8594 8595 /* We do IP header normalization and packet reassembly here */ 8596 if (pf_normalize_ip6(m0, kif, &reason, &pd) != PF_PASS) { 8597 action = PF_DROP; 8598 goto done; 8599 } 8600 m = *m0; /* pf_normalize messes with m0 */ 8601 h = mtod(m, struct ip6_hdr *); 8602 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 8603 8604 /* 8605 * we do not support jumbogram. if we keep going, zero ip6_plen 8606 * will do something bad, so drop the packet for now. 8607 */ 8608 if (htons(h->ip6_plen) == 0) { 8609 action = PF_DROP; 8610 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 8611 goto done; 8612 } 8613 8614 pd.src = (struct pf_addr *)&h->ip6_src; 8615 pd.dst = (struct pf_addr *)&h->ip6_dst; 8616 pd.tos = IPV6_DSCP(h); 8617 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 8618 8619 pd.proto = h->ip6_nxt; 8620 do { 8621 switch (pd.proto) { 8622 case IPPROTO_FRAGMENT: 8623 action = pf_test_fragment(&r, kif, m, h, &pd, &a, 8624 &ruleset); 8625 if (action == PF_DROP) 8626 REASON_SET(&reason, PFRES_FRAG); 8627 goto done; 8628 case IPPROTO_ROUTING: { 8629 struct ip6_rthdr rthdr; 8630 8631 if (rh_cnt++) { 8632 DPFPRINTF(PF_DEBUG_MISC, 8633 ("pf: IPv6 more than one rthdr\n")); 8634 action = PF_DROP; 8635 REASON_SET(&reason, PFRES_IPOPTIONS); 8636 pd.act.log = PF_LOG_FORCE; 8637 goto done; 8638 } 8639 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 8640 &reason, pd.af)) { 8641 DPFPRINTF(PF_DEBUG_MISC, 8642 ("pf: IPv6 short rthdr\n")); 8643 action = PF_DROP; 8644 REASON_SET(&reason, PFRES_SHORT); 8645 pd.act.log = PF_LOG_FORCE; 8646 goto done; 8647 } 8648 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 8649 DPFPRINTF(PF_DEBUG_MISC, 8650 ("pf: IPv6 rthdr0\n")); 8651 action = PF_DROP; 8652 REASON_SET(&reason, PFRES_IPOPTIONS); 8653 pd.act.log = PF_LOG_FORCE; 8654 goto done; 8655 } 8656 /* FALLTHROUGH */ 8657 } 8658 case IPPROTO_AH: 8659 case IPPROTO_HOPOPTS: 8660 case IPPROTO_DSTOPTS: { 8661 /* get next header and header length */ 8662 struct ip6_ext opt6; 8663 8664 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 8665 NULL, &reason, pd.af)) { 8666 DPFPRINTF(PF_DEBUG_MISC, 8667 ("pf: IPv6 short opt\n")); 8668 action = PF_DROP; 8669 pd.act.log = PF_LOG_FORCE; 8670 goto done; 8671 } 8672 if (pd.proto == IPPROTO_AH) 8673 off += (opt6.ip6e_len + 2) * 4; 8674 else 8675 off += (opt6.ip6e_len + 1) * 8; 8676 pd.proto = opt6.ip6e_nxt; 8677 /* goto the next header */ 8678 break; 8679 } 8680 default: 8681 terminal++; 8682 break; 8683 } 8684 } while (!terminal); 8685 8686 /* if there's no routing header, use unmodified mbuf for checksumming */ 8687 if (!n) 8688 n = m; 8689 8690 switch (pd.proto) { 8691 case IPPROTO_TCP: { 8692 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), 8693 &action, &reason, AF_INET6)) { 8694 if (action != PF_PASS) 8695 pd.act.log |= PF_LOG_FORCE; 8696 goto done; 8697 } 8698 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); 8699 pd.sport = &pd.hdr.tcp.th_sport; 8700 pd.dport = &pd.hdr.tcp.th_dport; 8701 8702 /* Respond to SYN with a syncookie. */ 8703 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN && 8704 pd.dir == PF_IN && pf_synflood_check(&pd)) { 8705 pf_syncookie_send(m, off, &pd); 8706 action = PF_DROP; 8707 break; 8708 } 8709 8710 action = pf_normalize_tcp(kif, m, 0, off, h, &pd); 8711 if (action == PF_DROP) 8712 goto done; 8713 action = pf_test_state_tcp(&s, kif, m, off, h, &pd, &reason); 8714 if (action == PF_PASS) { 8715 if (V_pfsync_update_state_ptr != NULL) 8716 V_pfsync_update_state_ptr(s); 8717 r = s->rule.ptr; 8718 a = s->anchor.ptr; 8719 } else if (s == NULL) { 8720 /* Validate remote SYN|ACK, re-create original SYN if 8721 * valid. */ 8722 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == 8723 TH_ACK && pf_syncookie_validate(&pd) && 8724 pd.dir == PF_IN) { 8725 struct mbuf *msyn; 8726 8727 msyn = pf_syncookie_recreate_syn(h->ip6_hlim, 8728 off, &pd); 8729 if (msyn == NULL) { 8730 action = PF_DROP; 8731 break; 8732 } 8733 8734 action = pf_test6(dir, pflags, ifp, &msyn, inp, 8735 &pd.act); 8736 m_freem(msyn); 8737 if (action != PF_PASS) 8738 break; 8739 8740 action = pf_test_state_tcp(&s, kif, m, off, h, 8741 &pd, &reason); 8742 if (action != PF_PASS || s == NULL) { 8743 action = PF_DROP; 8744 break; 8745 } 8746 8747 s->src.seqhi = ntohl(pd.hdr.tcp.th_ack) - 1; 8748 s->src.seqlo = ntohl(pd.hdr.tcp.th_seq) - 1; 8749 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_DST); 8750 8751 action = pf_synproxy(&pd, &s, &reason); 8752 break; 8753 } else { 8754 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8755 &a, &ruleset, inp); 8756 } 8757 } 8758 break; 8759 } 8760 8761 case IPPROTO_UDP: { 8762 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), 8763 &action, &reason, AF_INET6)) { 8764 if (action != PF_PASS) 8765 pd.act.log |= PF_LOG_FORCE; 8766 goto done; 8767 } 8768 pd.sport = &pd.hdr.udp.uh_sport; 8769 pd.dport = &pd.hdr.udp.uh_dport; 8770 if (pd.hdr.udp.uh_dport == 0 || 8771 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || 8772 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { 8773 action = PF_DROP; 8774 REASON_SET(&reason, PFRES_SHORT); 8775 goto done; 8776 } 8777 action = pf_test_state_udp(&s, kif, m, off, h, &pd); 8778 if (action == PF_PASS) { 8779 if (V_pfsync_update_state_ptr != NULL) 8780 V_pfsync_update_state_ptr(s); 8781 r = s->rule.ptr; 8782 a = s->anchor.ptr; 8783 } else if (s == NULL) 8784 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8785 &a, &ruleset, inp); 8786 break; 8787 } 8788 8789 case IPPROTO_SCTP: { 8790 if (!pf_pull_hdr(m, off, &pd.hdr.sctp, sizeof(pd.hdr.sctp), 8791 &action, &reason, AF_INET6)) { 8792 if (action != PF_PASS) 8793 pd.act.log |= PF_LOG_FORCE; 8794 goto done; 8795 } 8796 pd.sport = &pd.hdr.sctp.src_port; 8797 pd.dport = &pd.hdr.sctp.dest_port; 8798 if (pd.hdr.sctp.src_port == 0 || pd.hdr.sctp.dest_port == 0) { 8799 action = PF_DROP; 8800 REASON_SET(&reason, PFRES_SHORT); 8801 goto done; 8802 } 8803 action = pf_normalize_sctp(dir, kif, m, 0, off, h, &pd); 8804 if (action == PF_DROP) 8805 goto done; 8806 action = pf_test_state_sctp(&s, kif, m, off, h, &pd, 8807 &reason); 8808 if (action == PF_PASS) { 8809 if (V_pfsync_update_state_ptr != NULL) 8810 V_pfsync_update_state_ptr(s); 8811 r = s->rule.ptr; 8812 a = s->anchor.ptr; 8813 } else { 8814 action = pf_test_rule(&r, &s, kif, m, off, 8815 &pd, &a, &ruleset, inp); 8816 } 8817 break; 8818 } 8819 8820 case IPPROTO_ICMP: { 8821 action = PF_DROP; 8822 DPFPRINTF(PF_DEBUG_MISC, 8823 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 8824 goto done; 8825 } 8826 8827 case IPPROTO_ICMPV6: { 8828 if (!pf_pull_hdr(m, off, &pd.hdr.icmp6, sizeof(pd.hdr.icmp6), 8829 &action, &reason, AF_INET6)) { 8830 if (action != PF_PASS) 8831 pd.act.log |= PF_LOG_FORCE; 8832 goto done; 8833 } 8834 action = pf_test_state_icmp(&s, kif, m, off, h, &pd, &reason); 8835 if (action == PF_PASS) { 8836 if (V_pfsync_update_state_ptr != NULL) 8837 V_pfsync_update_state_ptr(s); 8838 r = s->rule.ptr; 8839 a = s->anchor.ptr; 8840 } else if (s == NULL) 8841 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8842 &a, &ruleset, inp); 8843 break; 8844 } 8845 8846 default: 8847 action = pf_test_state_other(&s, kif, m, &pd); 8848 if (action == PF_PASS) { 8849 if (V_pfsync_update_state_ptr != NULL) 8850 V_pfsync_update_state_ptr(s); 8851 r = s->rule.ptr; 8852 a = s->anchor.ptr; 8853 } else if (s == NULL) 8854 action = pf_test_rule(&r, &s, kif, m, off, &pd, 8855 &a, &ruleset, inp); 8856 break; 8857 } 8858 8859 done: 8860 PF_RULES_RUNLOCK(); 8861 if (n != m) { 8862 m_freem(n); 8863 n = NULL; 8864 } 8865 8866 /* handle dangerous IPv6 extension headers. */ 8867 if (action == PF_PASS && rh_cnt && 8868 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 8869 action = PF_DROP; 8870 REASON_SET(&reason, PFRES_IPOPTIONS); 8871 pd.act.log = r->log; 8872 DPFPRINTF(PF_DEBUG_MISC, 8873 ("pf: dropping packet with dangerous v6 headers\n")); 8874 } 8875 8876 if (s) { 8877 uint8_t log = pd.act.log; 8878 memcpy(&pd.act, &s->act, sizeof(struct pf_rule_actions)); 8879 pd.act.log |= log; 8880 tag = s->tag; 8881 rt = s->rt; 8882 } else { 8883 tag = r->tag; 8884 rt = r->rt; 8885 } 8886 8887 if (tag > 0 && pf_tag_packet(m, &pd, tag)) { 8888 action = PF_DROP; 8889 REASON_SET(&reason, PFRES_MEMORY); 8890 } 8891 8892 pf_scrub_ip6(&m, &pd); 8893 if (pd.proto == IPPROTO_TCP && pd.act.max_mss) 8894 pf_normalize_mss(m, off, &pd); 8895 8896 if (pd.act.rtableid >= 0) 8897 M_SETFIB(m, pd.act.rtableid); 8898 8899 if (pd.act.flags & PFSTATE_SETPRIO) { 8900 if (pd.tos & IPTOS_LOWDELAY) 8901 use_2nd_queue = 1; 8902 if (vlan_set_pcp(m, pd.act.set_prio[use_2nd_queue])) { 8903 action = PF_DROP; 8904 REASON_SET(&reason, PFRES_MEMORY); 8905 pd.act.log = PF_LOG_FORCE; 8906 DPFPRINTF(PF_DEBUG_MISC, 8907 ("pf: failed to allocate 802.1q mtag\n")); 8908 } 8909 } 8910 8911 #ifdef ALTQ 8912 if (action == PF_PASS && pd.act.qid) { 8913 if (pd.pf_mtag == NULL && 8914 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 8915 action = PF_DROP; 8916 REASON_SET(&reason, PFRES_MEMORY); 8917 } else { 8918 if (s != NULL) 8919 pd.pf_mtag->qid_hash = pf_state_hash(s); 8920 if (pd.tos & IPTOS_LOWDELAY) 8921 pd.pf_mtag->qid = pd.act.pqid; 8922 else 8923 pd.pf_mtag->qid = pd.act.qid; 8924 /* Add hints for ecn. */ 8925 pd.pf_mtag->hdr = h; 8926 } 8927 } 8928 #endif /* ALTQ */ 8929 8930 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 8931 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 8932 (s->nat_rule.ptr->action == PF_RDR || 8933 s->nat_rule.ptr->action == PF_BINAT) && 8934 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 8935 m->m_flags |= M_SKIP_FIREWALL; 8936 8937 /* XXX: Anybody working on it?! */ 8938 if (r->divert.port) 8939 printf("pf: divert(9) is not supported for IPv6\n"); 8940 8941 if (pd.act.log) { 8942 struct pf_krule *lr; 8943 struct pf_krule_item *ri; 8944 8945 if (s != NULL && s->nat_rule.ptr != NULL && 8946 s->nat_rule.ptr->log & PF_LOG_ALL) 8947 lr = s->nat_rule.ptr; 8948 else 8949 lr = r; 8950 8951 if (pd.act.log & PF_LOG_FORCE || lr->log & PF_LOG_ALL) 8952 PFLOG_PACKET(kif, m, AF_INET6, action, reason, lr, a, ruleset, 8953 &pd, (s == NULL)); 8954 if (s) { 8955 SLIST_FOREACH(ri, &s->match_rules, entry) 8956 if (ri->r->log & PF_LOG_ALL) 8957 PFLOG_PACKET(kif, m, AF_INET6, action, reason, 8958 ri->r, a, ruleset, &pd, 0); 8959 } 8960 } 8961 8962 pf_counter_u64_critical_enter(); 8963 pf_counter_u64_add_protected(&kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS], 8964 pd.tot_len); 8965 pf_counter_u64_add_protected(&kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS], 8966 1); 8967 8968 if (action == PF_PASS || r->action == PF_DROP) { 8969 dirndx = (dir == PF_OUT); 8970 pf_counter_u64_add_protected(&r->packets[dirndx], 1); 8971 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); 8972 if (a != NULL) { 8973 pf_counter_u64_add_protected(&a->packets[dirndx], 1); 8974 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); 8975 } 8976 if (s != NULL) { 8977 if (s->nat_rule.ptr != NULL) { 8978 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 8979 1); 8980 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], 8981 pd.tot_len); 8982 } 8983 if (s->src_node != NULL) { 8984 counter_u64_add(s->src_node->packets[dirndx], 8985 1); 8986 counter_u64_add(s->src_node->bytes[dirndx], 8987 pd.tot_len); 8988 } 8989 if (s->nat_src_node != NULL) { 8990 counter_u64_add(s->nat_src_node->packets[dirndx], 8991 1); 8992 counter_u64_add(s->nat_src_node->bytes[dirndx], 8993 pd.tot_len); 8994 } 8995 dirndx = (dir == s->direction) ? 0 : 1; 8996 s->packets[dirndx]++; 8997 s->bytes[dirndx] += pd.tot_len; 8998 } 8999 tr = r; 9000 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 9001 if (nr != NULL && r == &V_pf_default_rule) 9002 tr = nr; 9003 if (tr->src.addr.type == PF_ADDR_TABLE) 9004 pfr_update_stats(tr->src.addr.p.tbl, 9005 (s == NULL) ? pd.src : 9006 &s->key[(s->direction == PF_IN)]->addr[0], 9007 pd.af, pd.tot_len, dir == PF_OUT, 9008 r->action == PF_PASS, tr->src.neg); 9009 if (tr->dst.addr.type == PF_ADDR_TABLE) 9010 pfr_update_stats(tr->dst.addr.p.tbl, 9011 (s == NULL) ? pd.dst : 9012 &s->key[(s->direction == PF_IN)]->addr[1], 9013 pd.af, pd.tot_len, dir == PF_OUT, 9014 r->action == PF_PASS, tr->dst.neg); 9015 } 9016 pf_counter_u64_critical_exit(); 9017 9018 switch (action) { 9019 case PF_SYNPROXY_DROP: 9020 m_freem(*m0); 9021 case PF_DEFER: 9022 *m0 = NULL; 9023 action = PF_PASS; 9024 break; 9025 case PF_DROP: 9026 m_freem(*m0); 9027 *m0 = NULL; 9028 break; 9029 default: 9030 /* pf_route6() returns unlocked. */ 9031 if (rt) { 9032 pf_route6(m0, r, kif->pfik_ifp, s, &pd, inp); 9033 goto out; 9034 } 9035 if (pf_dummynet(&pd, s, r, m0) != 0) { 9036 action = PF_DROP; 9037 REASON_SET(&reason, PFRES_MEMORY); 9038 } 9039 break; 9040 } 9041 9042 if (s && action != PF_DROP) { 9043 if (!s->if_index_in && dir == PF_IN) 9044 s->if_index_in = ifp->if_index; 9045 else if (!s->if_index_out && dir == PF_OUT) 9046 s->if_index_out = ifp->if_index; 9047 } 9048 9049 if (s) 9050 PF_STATE_UNLOCK(s); 9051 9052 /* If reassembled packet passed, create new fragments. */ 9053 if (action == PF_PASS && *m0 && dir == PF_OUT && 9054 (mtag = m_tag_find(m, PACKET_TAG_PF_REASSEMBLED, NULL)) != NULL) 9055 action = pf_refragment6(ifp, m0, mtag, pflags & PFIL_FWD); 9056 9057 out: 9058 SDT_PROBE4(pf, ip, test6, done, action, reason, r, s); 9059 9060 pf_sctp_multihome_delayed(&pd, off, kif, s, action); 9061 9062 return (action); 9063 } 9064 #endif /* INET6 */ 9065