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