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 rm_priotracker in_ifa_tracker; 1597 struct ip *ip; 1598 struct in_ifaddr *ia = NULL; 1599 1600 ip = mtod(m, struct ip *); 1601 IN_IFADDR_RLOCK(&in_ifa_tracker); 1602 LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 1603 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr) { 1604 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 1605 return (true); 1606 } 1607 } 1608 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 1609 break; 1610 } 1611 #endif 1612 #ifdef INET6 1613 case AF_INET6: { 1614 struct ip6_hdr *ip6; 1615 struct in6_ifaddr *ia; 1616 ip6 = mtod(m, struct ip6_hdr *); 1617 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 1618 if (ia == NULL) 1619 return (false); 1620 return (! (ia->ia6_flags & IN6_IFF_NOTREADY)); 1621 } 1622 #endif 1623 default: 1624 panic("Unsupported af %d", af); 1625 } 1626 1627 return (false); 1628 } 1629 1630 void 1631 pf_intr(void *v) 1632 { 1633 struct epoch_tracker et; 1634 struct pf_send_head queue; 1635 struct pf_send_entry *pfse, *next; 1636 1637 CURVNET_SET((struct vnet *)v); 1638 1639 PF_SENDQ_LOCK(); 1640 queue = V_pf_sendqueue; 1641 STAILQ_INIT(&V_pf_sendqueue); 1642 PF_SENDQ_UNLOCK(); 1643 1644 NET_EPOCH_ENTER(et); 1645 1646 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) { 1647 switch (pfse->pfse_type) { 1648 #ifdef INET 1649 case PFSE_IP: { 1650 if (pf_isforlocal(pfse->pfse_m, AF_INET)) { 1651 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; 1652 pfse->pfse_m->m_pkthdr.csum_flags |= 1653 CSUM_IP_VALID | CSUM_IP_CHECKED; 1654 ip_input(pfse->pfse_m); 1655 } else { 1656 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, 1657 NULL); 1658 } 1659 break; 1660 } 1661 case PFSE_ICMP: 1662 icmp_error(pfse->pfse_m, pfse->icmpopts.type, 1663 pfse->icmpopts.code, 0, pfse->icmpopts.mtu); 1664 break; 1665 #endif /* INET */ 1666 #ifdef INET6 1667 case PFSE_IP6: 1668 if (pf_isforlocal(pfse->pfse_m, AF_INET6)) { 1669 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL; 1670 ip6_input(pfse->pfse_m); 1671 } else { 1672 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, 1673 NULL, NULL); 1674 } 1675 break; 1676 case PFSE_ICMP6: 1677 icmp6_error(pfse->pfse_m, pfse->icmpopts.type, 1678 pfse->icmpopts.code, pfse->icmpopts.mtu); 1679 break; 1680 #endif /* INET6 */ 1681 default: 1682 panic("%s: unknown type", __func__); 1683 } 1684 free(pfse, M_PFTEMP); 1685 } 1686 NET_EPOCH_EXIT(et); 1687 CURVNET_RESTORE(); 1688 } 1689 1690 #define pf_purge_thread_period (hz / 10) 1691 1692 #ifdef PF_WANT_32_TO_64_COUNTER 1693 static void 1694 pf_status_counter_u64_periodic(void) 1695 { 1696 1697 PF_RULES_RASSERT(); 1698 1699 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 60)) != 0) { 1700 return; 1701 } 1702 1703 for (int i = 0; i < FCNT_MAX; i++) { 1704 pf_counter_u64_periodic(&V_pf_status.fcounters[i]); 1705 } 1706 } 1707 1708 static void 1709 pf_kif_counter_u64_periodic(void) 1710 { 1711 struct pfi_kkif *kif; 1712 size_t r, run; 1713 1714 PF_RULES_RASSERT(); 1715 1716 if (__predict_false(V_pf_allkifcount == 0)) { 1717 return; 1718 } 1719 1720 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { 1721 return; 1722 } 1723 1724 run = V_pf_allkifcount / 10; 1725 if (run < 5) 1726 run = 5; 1727 1728 for (r = 0; r < run; r++) { 1729 kif = LIST_NEXT(V_pf_kifmarker, pfik_allkiflist); 1730 if (kif == NULL) { 1731 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); 1732 LIST_INSERT_HEAD(&V_pf_allkiflist, V_pf_kifmarker, pfik_allkiflist); 1733 break; 1734 } 1735 1736 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist); 1737 LIST_INSERT_AFTER(kif, V_pf_kifmarker, pfik_allkiflist); 1738 1739 for (int i = 0; i < 2; i++) { 1740 for (int j = 0; j < 2; j++) { 1741 for (int k = 0; k < 2; k++) { 1742 pf_counter_u64_periodic(&kif->pfik_packets[i][j][k]); 1743 pf_counter_u64_periodic(&kif->pfik_bytes[i][j][k]); 1744 } 1745 } 1746 } 1747 } 1748 } 1749 1750 static void 1751 pf_rule_counter_u64_periodic(void) 1752 { 1753 struct pf_krule *rule; 1754 size_t r, run; 1755 1756 PF_RULES_RASSERT(); 1757 1758 if (__predict_false(V_pf_allrulecount == 0)) { 1759 return; 1760 } 1761 1762 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) { 1763 return; 1764 } 1765 1766 run = V_pf_allrulecount / 10; 1767 if (run < 5) 1768 run = 5; 1769 1770 for (r = 0; r < run; r++) { 1771 rule = LIST_NEXT(V_pf_rulemarker, allrulelist); 1772 if (rule == NULL) { 1773 LIST_REMOVE(V_pf_rulemarker, allrulelist); 1774 LIST_INSERT_HEAD(&V_pf_allrulelist, V_pf_rulemarker, allrulelist); 1775 break; 1776 } 1777 1778 LIST_REMOVE(V_pf_rulemarker, allrulelist); 1779 LIST_INSERT_AFTER(rule, V_pf_rulemarker, allrulelist); 1780 1781 pf_counter_u64_periodic(&rule->evaluations); 1782 for (int i = 0; i < 2; i++) { 1783 pf_counter_u64_periodic(&rule->packets[i]); 1784 pf_counter_u64_periodic(&rule->bytes[i]); 1785 } 1786 } 1787 } 1788 1789 static void 1790 pf_counter_u64_periodic_main(void) 1791 { 1792 PF_RULES_RLOCK_TRACKER; 1793 1794 V_pf_counter_periodic_iter++; 1795 1796 PF_RULES_RLOCK(); 1797 pf_counter_u64_critical_enter(); 1798 pf_status_counter_u64_periodic(); 1799 pf_kif_counter_u64_periodic(); 1800 pf_rule_counter_u64_periodic(); 1801 pf_counter_u64_critical_exit(); 1802 PF_RULES_RUNLOCK(); 1803 } 1804 #else 1805 #define pf_counter_u64_periodic_main() do { } while (0) 1806 #endif 1807 1808 void 1809 pf_purge_thread(void *unused __unused) 1810 { 1811 VNET_ITERATOR_DECL(vnet_iter); 1812 1813 sx_xlock(&pf_end_lock); 1814 while (pf_end_threads == 0) { 1815 sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", pf_purge_thread_period); 1816 1817 VNET_LIST_RLOCK(); 1818 VNET_FOREACH(vnet_iter) { 1819 CURVNET_SET(vnet_iter); 1820 1821 /* Wait until V_pf_default_rule is initialized. */ 1822 if (V_pf_vnet_active == 0) { 1823 CURVNET_RESTORE(); 1824 continue; 1825 } 1826 1827 pf_counter_u64_periodic_main(); 1828 1829 /* 1830 * Process 1/interval fraction of the state 1831 * table every run. 1832 */ 1833 V_pf_purge_idx = 1834 pf_purge_expired_states(V_pf_purge_idx, pf_hashmask / 1835 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10)); 1836 1837 /* 1838 * Purge other expired types every 1839 * PFTM_INTERVAL seconds. 1840 */ 1841 if (V_pf_purge_idx == 0) { 1842 /* 1843 * Order is important: 1844 * - states and src nodes reference rules 1845 * - states and rules reference kifs 1846 */ 1847 pf_purge_expired_fragments(); 1848 pf_purge_expired_src_nodes(); 1849 pf_purge_unlinked_rules(); 1850 pfi_kkif_purge(); 1851 } 1852 CURVNET_RESTORE(); 1853 } 1854 VNET_LIST_RUNLOCK(); 1855 } 1856 1857 pf_end_threads++; 1858 sx_xunlock(&pf_end_lock); 1859 kproc_exit(0); 1860 } 1861 1862 void 1863 pf_unload_vnet_purge(void) 1864 { 1865 1866 /* 1867 * To cleanse up all kifs and rules we need 1868 * two runs: first one clears reference flags, 1869 * then pf_purge_expired_states() doesn't 1870 * raise them, and then second run frees. 1871 */ 1872 pf_purge_unlinked_rules(); 1873 pfi_kkif_purge(); 1874 1875 /* 1876 * Now purge everything. 1877 */ 1878 pf_purge_expired_states(0, pf_hashmask); 1879 pf_purge_fragments(UINT_MAX); 1880 pf_purge_expired_src_nodes(); 1881 1882 /* 1883 * Now all kifs & rules should be unreferenced, 1884 * thus should be successfully freed. 1885 */ 1886 pf_purge_unlinked_rules(); 1887 pfi_kkif_purge(); 1888 } 1889 1890 u_int32_t 1891 pf_state_expires(const struct pf_kstate *state) 1892 { 1893 u_int32_t timeout; 1894 u_int32_t start; 1895 u_int32_t end; 1896 u_int32_t states; 1897 1898 /* handle all PFTM_* > PFTM_MAX here */ 1899 if (state->timeout == PFTM_PURGE) 1900 return (time_uptime); 1901 KASSERT(state->timeout != PFTM_UNLINKED, 1902 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1903 KASSERT((state->timeout < PFTM_MAX), 1904 ("pf_state_expires: timeout > PFTM_MAX")); 1905 timeout = state->rule.ptr->timeout[state->timeout]; 1906 if (!timeout) 1907 timeout = V_pf_default_rule.timeout[state->timeout]; 1908 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1909 if (start && state->rule.ptr != &V_pf_default_rule) { 1910 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1911 states = counter_u64_fetch(state->rule.ptr->states_cur); 1912 } else { 1913 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1914 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1915 states = V_pf_status.states; 1916 } 1917 if (end && states > start && start < end) { 1918 if (states < end) { 1919 timeout = (u_int64_t)timeout * (end - states) / 1920 (end - start); 1921 return (state->expire + timeout); 1922 } 1923 else 1924 return (time_uptime); 1925 } 1926 return (state->expire + timeout); 1927 } 1928 1929 void 1930 pf_purge_expired_src_nodes() 1931 { 1932 struct pf_ksrc_node_list freelist; 1933 struct pf_srchash *sh; 1934 struct pf_ksrc_node *cur, *next; 1935 int i; 1936 1937 LIST_INIT(&freelist); 1938 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) { 1939 PF_HASHROW_LOCK(sh); 1940 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next) 1941 if (cur->states == 0 && cur->expire <= time_uptime) { 1942 pf_unlink_src_node(cur); 1943 LIST_INSERT_HEAD(&freelist, cur, entry); 1944 } else if (cur->rule.ptr != NULL) 1945 cur->rule.ptr->rule_ref |= PFRULE_REFS; 1946 PF_HASHROW_UNLOCK(sh); 1947 } 1948 1949 pf_free_src_nodes(&freelist); 1950 1951 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z); 1952 } 1953 1954 static void 1955 pf_src_tree_remove_state(struct pf_kstate *s) 1956 { 1957 struct pf_ksrc_node *sn; 1958 struct pf_srchash *sh; 1959 uint32_t timeout; 1960 1961 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ? 1962 s->rule.ptr->timeout[PFTM_SRC_NODE] : 1963 V_pf_default_rule.timeout[PFTM_SRC_NODE]; 1964 1965 if (s->src_node != NULL) { 1966 sn = s->src_node; 1967 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1968 PF_HASHROW_LOCK(sh); 1969 if (s->src.tcp_est) 1970 --sn->conn; 1971 if (--sn->states == 0) 1972 sn->expire = time_uptime + timeout; 1973 PF_HASHROW_UNLOCK(sh); 1974 } 1975 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1976 sn = s->nat_src_node; 1977 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 1978 PF_HASHROW_LOCK(sh); 1979 if (--sn->states == 0) 1980 sn->expire = time_uptime + timeout; 1981 PF_HASHROW_UNLOCK(sh); 1982 } 1983 s->src_node = s->nat_src_node = NULL; 1984 } 1985 1986 /* 1987 * Unlink and potentilly free a state. Function may be 1988 * called with ID hash row locked, but always returns 1989 * unlocked, since it needs to go through key hash locking. 1990 */ 1991 int 1992 pf_unlink_state(struct pf_kstate *s, u_int flags) 1993 { 1994 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)]; 1995 1996 if ((flags & PF_ENTER_LOCKED) == 0) 1997 PF_HASHROW_LOCK(ih); 1998 else 1999 PF_HASHROW_ASSERT(ih); 2000 2001 if (s->timeout == PFTM_UNLINKED) { 2002 /* 2003 * State is being processed 2004 * by pf_unlink_state() in 2005 * an other thread. 2006 */ 2007 PF_HASHROW_UNLOCK(ih); 2008 return (0); /* XXXGL: undefined actually */ 2009 } 2010 2011 if (s->src.state == PF_TCPS_PROXY_DST) { 2012 /* XXX wire key the right one? */ 2013 pf_send_tcp(s->rule.ptr, s->key[PF_SK_WIRE]->af, 2014 &s->key[PF_SK_WIRE]->addr[1], 2015 &s->key[PF_SK_WIRE]->addr[0], 2016 s->key[PF_SK_WIRE]->port[1], 2017 s->key[PF_SK_WIRE]->port[0], 2018 s->src.seqhi, s->src.seqlo + 1, 2019 TH_RST|TH_ACK, 0, 0, 0, 1, s->tag); 2020 } 2021 2022 LIST_REMOVE(s, entry); 2023 pf_src_tree_remove_state(s); 2024 2025 if (V_pfsync_delete_state_ptr != NULL) 2026 V_pfsync_delete_state_ptr(s); 2027 2028 STATE_DEC_COUNTERS(s); 2029 2030 s->timeout = PFTM_UNLINKED; 2031 2032 /* Ensure we remove it from the list of halfopen states, if needed. */ 2033 if (s->key[PF_SK_STACK] != NULL && 2034 s->key[PF_SK_STACK]->proto == IPPROTO_TCP) 2035 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED); 2036 2037 PF_HASHROW_UNLOCK(ih); 2038 2039 pf_detach_state(s); 2040 /* pf_state_insert() initialises refs to 2 */ 2041 return (pf_release_staten(s, 2)); 2042 } 2043 2044 struct pf_kstate * 2045 pf_alloc_state(int flags) 2046 { 2047 2048 return (uma_zalloc(V_pf_state_z, flags | M_ZERO)); 2049 } 2050 2051 void 2052 pf_free_state(struct pf_kstate *cur) 2053 { 2054 2055 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur)); 2056 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__, 2057 cur->timeout)); 2058 2059 pf_normalize_tcp_cleanup(cur); 2060 uma_zfree(V_pf_state_z, cur); 2061 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1); 2062 } 2063 2064 /* 2065 * Called only from pf_purge_thread(), thus serialized. 2066 */ 2067 static u_int 2068 pf_purge_expired_states(u_int i, int maxcheck) 2069 { 2070 struct pf_idhash *ih; 2071 struct pf_kstate *s; 2072 2073 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2074 2075 /* 2076 * Go through hash and unlink states that expire now. 2077 */ 2078 while (maxcheck > 0) { 2079 ih = &V_pf_idhash[i]; 2080 2081 /* only take the lock if we expect to do work */ 2082 if (!LIST_EMPTY(&ih->states)) { 2083 relock: 2084 PF_HASHROW_LOCK(ih); 2085 LIST_FOREACH(s, &ih->states, entry) { 2086 if (pf_state_expires(s) <= time_uptime) { 2087 V_pf_status.states -= 2088 pf_unlink_state(s, PF_ENTER_LOCKED); 2089 goto relock; 2090 } 2091 s->rule.ptr->rule_ref |= PFRULE_REFS; 2092 if (s->nat_rule.ptr != NULL) 2093 s->nat_rule.ptr->rule_ref |= PFRULE_REFS; 2094 if (s->anchor.ptr != NULL) 2095 s->anchor.ptr->rule_ref |= PFRULE_REFS; 2096 s->kif->pfik_flags |= PFI_IFLAG_REFS; 2097 if (s->rt_kif) 2098 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS; 2099 } 2100 PF_HASHROW_UNLOCK(ih); 2101 } 2102 2103 /* Return when we hit end of hash. */ 2104 if (++i > pf_hashmask) { 2105 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2106 return (0); 2107 } 2108 2109 maxcheck--; 2110 } 2111 2112 V_pf_status.states = uma_zone_get_cur(V_pf_state_z); 2113 2114 return (i); 2115 } 2116 2117 static void 2118 pf_purge_unlinked_rules() 2119 { 2120 struct pf_krulequeue tmpq; 2121 struct pf_krule *r, *r1; 2122 2123 /* 2124 * If we have overloading task pending, then we'd 2125 * better skip purging this time. There is a tiny 2126 * probability that overloading task references 2127 * an already unlinked rule. 2128 */ 2129 PF_OVERLOADQ_LOCK(); 2130 if (!SLIST_EMPTY(&V_pf_overloadqueue)) { 2131 PF_OVERLOADQ_UNLOCK(); 2132 return; 2133 } 2134 PF_OVERLOADQ_UNLOCK(); 2135 2136 /* 2137 * Do naive mark-and-sweep garbage collecting of old rules. 2138 * Reference flag is raised by pf_purge_expired_states() 2139 * and pf_purge_expired_src_nodes(). 2140 * 2141 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK, 2142 * use a temporary queue. 2143 */ 2144 TAILQ_INIT(&tmpq); 2145 PF_UNLNKDRULES_LOCK(); 2146 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) { 2147 if (!(r->rule_ref & PFRULE_REFS)) { 2148 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries); 2149 TAILQ_INSERT_TAIL(&tmpq, r, entries); 2150 } else 2151 r->rule_ref &= ~PFRULE_REFS; 2152 } 2153 PF_UNLNKDRULES_UNLOCK(); 2154 2155 if (!TAILQ_EMPTY(&tmpq)) { 2156 PF_RULES_WLOCK(); 2157 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) { 2158 TAILQ_REMOVE(&tmpq, r, entries); 2159 pf_free_rule(r); 2160 } 2161 PF_RULES_WUNLOCK(); 2162 } 2163 } 2164 2165 void 2166 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 2167 { 2168 switch (af) { 2169 #ifdef INET 2170 case AF_INET: { 2171 u_int32_t a = ntohl(addr->addr32[0]); 2172 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 2173 (a>>8)&255, a&255); 2174 if (p) { 2175 p = ntohs(p); 2176 printf(":%u", p); 2177 } 2178 break; 2179 } 2180 #endif /* INET */ 2181 #ifdef INET6 2182 case AF_INET6: { 2183 u_int16_t b; 2184 u_int8_t i, curstart, curend, maxstart, maxend; 2185 curstart = curend = maxstart = maxend = 255; 2186 for (i = 0; i < 8; i++) { 2187 if (!addr->addr16[i]) { 2188 if (curstart == 255) 2189 curstart = i; 2190 curend = i; 2191 } else { 2192 if ((curend - curstart) > 2193 (maxend - maxstart)) { 2194 maxstart = curstart; 2195 maxend = curend; 2196 } 2197 curstart = curend = 255; 2198 } 2199 } 2200 if ((curend - curstart) > 2201 (maxend - maxstart)) { 2202 maxstart = curstart; 2203 maxend = curend; 2204 } 2205 for (i = 0; i < 8; i++) { 2206 if (i >= maxstart && i <= maxend) { 2207 if (i == 0) 2208 printf(":"); 2209 if (i == maxend) 2210 printf(":"); 2211 } else { 2212 b = ntohs(addr->addr16[i]); 2213 printf("%x", b); 2214 if (i < 7) 2215 printf(":"); 2216 } 2217 } 2218 if (p) { 2219 p = ntohs(p); 2220 printf("[%u]", p); 2221 } 2222 break; 2223 } 2224 #endif /* INET6 */ 2225 } 2226 } 2227 2228 void 2229 pf_print_state(struct pf_kstate *s) 2230 { 2231 pf_print_state_parts(s, NULL, NULL); 2232 } 2233 2234 static void 2235 pf_print_state_parts(struct pf_kstate *s, 2236 struct pf_state_key *skwp, struct pf_state_key *sksp) 2237 { 2238 struct pf_state_key *skw, *sks; 2239 u_int8_t proto, dir; 2240 2241 /* Do our best to fill these, but they're skipped if NULL */ 2242 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); 2243 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); 2244 proto = skw ? skw->proto : (sks ? sks->proto : 0); 2245 dir = s ? s->direction : 0; 2246 2247 switch (proto) { 2248 case IPPROTO_IPV4: 2249 printf("IPv4"); 2250 break; 2251 case IPPROTO_IPV6: 2252 printf("IPv6"); 2253 break; 2254 case IPPROTO_TCP: 2255 printf("TCP"); 2256 break; 2257 case IPPROTO_UDP: 2258 printf("UDP"); 2259 break; 2260 case IPPROTO_ICMP: 2261 printf("ICMP"); 2262 break; 2263 case IPPROTO_ICMPV6: 2264 printf("ICMPv6"); 2265 break; 2266 default: 2267 printf("%u", proto); 2268 break; 2269 } 2270 switch (dir) { 2271 case PF_IN: 2272 printf(" in"); 2273 break; 2274 case PF_OUT: 2275 printf(" out"); 2276 break; 2277 } 2278 if (skw) { 2279 printf(" wire: "); 2280 pf_print_host(&skw->addr[0], skw->port[0], skw->af); 2281 printf(" "); 2282 pf_print_host(&skw->addr[1], skw->port[1], skw->af); 2283 } 2284 if (sks) { 2285 printf(" stack: "); 2286 if (sks != skw) { 2287 pf_print_host(&sks->addr[0], sks->port[0], sks->af); 2288 printf(" "); 2289 pf_print_host(&sks->addr[1], sks->port[1], sks->af); 2290 } else 2291 printf("-"); 2292 } 2293 if (s) { 2294 if (proto == IPPROTO_TCP) { 2295 printf(" [lo=%u high=%u win=%u modulator=%u", 2296 s->src.seqlo, s->src.seqhi, 2297 s->src.max_win, s->src.seqdiff); 2298 if (s->src.wscale && s->dst.wscale) 2299 printf(" wscale=%u", 2300 s->src.wscale & PF_WSCALE_MASK); 2301 printf("]"); 2302 printf(" [lo=%u high=%u win=%u modulator=%u", 2303 s->dst.seqlo, s->dst.seqhi, 2304 s->dst.max_win, s->dst.seqdiff); 2305 if (s->src.wscale && s->dst.wscale) 2306 printf(" wscale=%u", 2307 s->dst.wscale & PF_WSCALE_MASK); 2308 printf("]"); 2309 } 2310 printf(" %u:%u", s->src.state, s->dst.state); 2311 } 2312 } 2313 2314 void 2315 pf_print_flags(u_int8_t f) 2316 { 2317 if (f) 2318 printf(" "); 2319 if (f & TH_FIN) 2320 printf("F"); 2321 if (f & TH_SYN) 2322 printf("S"); 2323 if (f & TH_RST) 2324 printf("R"); 2325 if (f & TH_PUSH) 2326 printf("P"); 2327 if (f & TH_ACK) 2328 printf("A"); 2329 if (f & TH_URG) 2330 printf("U"); 2331 if (f & TH_ECE) 2332 printf("E"); 2333 if (f & TH_CWR) 2334 printf("W"); 2335 } 2336 2337 #define PF_SET_SKIP_STEPS(i) \ 2338 do { \ 2339 while (head[i] != cur) { \ 2340 head[i]->skip[i].ptr = cur; \ 2341 head[i] = TAILQ_NEXT(head[i], entries); \ 2342 } \ 2343 } while (0) 2344 2345 void 2346 pf_calc_skip_steps(struct pf_krulequeue *rules) 2347 { 2348 struct pf_krule *cur, *prev, *head[PF_SKIP_COUNT]; 2349 int i; 2350 2351 cur = TAILQ_FIRST(rules); 2352 prev = cur; 2353 for (i = 0; i < PF_SKIP_COUNT; ++i) 2354 head[i] = cur; 2355 while (cur != NULL) { 2356 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 2357 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 2358 if (cur->direction != prev->direction) 2359 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 2360 if (cur->af != prev->af) 2361 PF_SET_SKIP_STEPS(PF_SKIP_AF); 2362 if (cur->proto != prev->proto) 2363 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 2364 if (cur->src.neg != prev->src.neg || 2365 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 2366 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 2367 if (cur->src.port[0] != prev->src.port[0] || 2368 cur->src.port[1] != prev->src.port[1] || 2369 cur->src.port_op != prev->src.port_op) 2370 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 2371 if (cur->dst.neg != prev->dst.neg || 2372 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 2373 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 2374 if (cur->dst.port[0] != prev->dst.port[0] || 2375 cur->dst.port[1] != prev->dst.port[1] || 2376 cur->dst.port_op != prev->dst.port_op) 2377 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 2378 2379 prev = cur; 2380 cur = TAILQ_NEXT(cur, entries); 2381 } 2382 for (i = 0; i < PF_SKIP_COUNT; ++i) 2383 PF_SET_SKIP_STEPS(i); 2384 } 2385 2386 static int 2387 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 2388 { 2389 if (aw1->type != aw2->type) 2390 return (1); 2391 switch (aw1->type) { 2392 case PF_ADDR_ADDRMASK: 2393 case PF_ADDR_RANGE: 2394 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6)) 2395 return (1); 2396 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6)) 2397 return (1); 2398 return (0); 2399 case PF_ADDR_DYNIFTL: 2400 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 2401 case PF_ADDR_NOROUTE: 2402 case PF_ADDR_URPFFAILED: 2403 return (0); 2404 case PF_ADDR_TABLE: 2405 return (aw1->p.tbl != aw2->p.tbl); 2406 default: 2407 printf("invalid address type: %d\n", aw1->type); 2408 return (1); 2409 } 2410 } 2411 2412 /** 2413 * Checksum updates are a little complicated because the checksum in the TCP/UDP 2414 * header isn't always a full checksum. In some cases (i.e. output) it's a 2415 * pseudo-header checksum, which is a partial checksum over src/dst IP 2416 * addresses, protocol number and length. 2417 * 2418 * That means we have the following cases: 2419 * * Input or forwarding: we don't have TSO, the checksum fields are full 2420 * checksums, we need to update the checksum whenever we change anything. 2421 * * Output (i.e. the checksum is a pseudo-header checksum): 2422 * x The field being updated is src/dst address or affects the length of 2423 * the packet. We need to update the pseudo-header checksum (note that this 2424 * checksum is not ones' complement). 2425 * x Some other field is being modified (e.g. src/dst port numbers): We 2426 * don't have to update anything. 2427 **/ 2428 u_int16_t 2429 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 2430 { 2431 u_int32_t x; 2432 2433 x = cksum + old - new; 2434 x = (x + (x >> 16)) & 0xffff; 2435 2436 /* optimise: eliminate a branch when not udp */ 2437 if (udp && cksum == 0x0000) 2438 return cksum; 2439 if (udp && x == 0x0000) 2440 x = 0xffff; 2441 2442 return (u_int16_t)(x); 2443 } 2444 2445 static void 2446 pf_patch_8(struct mbuf *m, u_int16_t *cksum, u_int8_t *f, u_int8_t v, bool hi, 2447 u_int8_t udp) 2448 { 2449 u_int16_t old = htons(hi ? (*f << 8) : *f); 2450 u_int16_t new = htons(hi ? ( v << 8) : v); 2451 2452 if (*f == v) 2453 return; 2454 2455 *f = v; 2456 2457 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2458 return; 2459 2460 *cksum = pf_cksum_fixup(*cksum, old, new, udp); 2461 } 2462 2463 void 2464 pf_patch_16_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int16_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 } 2473 2474 void 2475 pf_patch_32_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int32_t v, 2476 bool hi, u_int8_t udp) 2477 { 2478 u_int8_t *fb = (u_int8_t *)f; 2479 u_int8_t *vb = (u_int8_t *)&v; 2480 2481 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2482 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2483 pf_patch_8(m, cksum, fb++, *vb++, hi, udp); 2484 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp); 2485 } 2486 2487 u_int16_t 2488 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old, 2489 u_int16_t new, u_int8_t udp) 2490 { 2491 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2492 return (cksum); 2493 2494 return (pf_cksum_fixup(cksum, old, new, udp)); 2495 } 2496 2497 static void 2498 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic, 2499 u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, 2500 sa_family_t af) 2501 { 2502 struct pf_addr ao; 2503 u_int16_t po = *p; 2504 2505 PF_ACPY(&ao, a, af); 2506 PF_ACPY(a, an, af); 2507 2508 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6)) 2509 *pc = ~*pc; 2510 2511 *p = pn; 2512 2513 switch (af) { 2514 #ifdef INET 2515 case AF_INET: 2516 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2517 ao.addr16[0], an->addr16[0], 0), 2518 ao.addr16[1], an->addr16[1], 0); 2519 *p = pn; 2520 2521 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc, 2522 ao.addr16[0], an->addr16[0], u), 2523 ao.addr16[1], an->addr16[1], u); 2524 2525 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2526 break; 2527 #endif /* INET */ 2528 #ifdef INET6 2529 case AF_INET6: 2530 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2531 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2532 pf_cksum_fixup(pf_cksum_fixup(*pc, 2533 ao.addr16[0], an->addr16[0], u), 2534 ao.addr16[1], an->addr16[1], u), 2535 ao.addr16[2], an->addr16[2], u), 2536 ao.addr16[3], an->addr16[3], u), 2537 ao.addr16[4], an->addr16[4], u), 2538 ao.addr16[5], an->addr16[5], u), 2539 ao.addr16[6], an->addr16[6], u), 2540 ao.addr16[7], an->addr16[7], u); 2541 2542 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u); 2543 break; 2544 #endif /* INET6 */ 2545 } 2546 2547 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | 2548 CSUM_DELAY_DATA_IPV6)) { 2549 *pc = ~*pc; 2550 if (! *pc) 2551 *pc = 0xffff; 2552 } 2553 } 2554 2555 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 2556 void 2557 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 2558 { 2559 u_int32_t ao; 2560 2561 memcpy(&ao, a, sizeof(ao)); 2562 memcpy(a, &an, sizeof(u_int32_t)); 2563 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 2564 ao % 65536, an % 65536, u); 2565 } 2566 2567 void 2568 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp) 2569 { 2570 u_int32_t ao; 2571 2572 memcpy(&ao, a, sizeof(ao)); 2573 memcpy(a, &an, sizeof(u_int32_t)); 2574 2575 *c = pf_proto_cksum_fixup(m, 2576 pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp), 2577 ao % 65536, an % 65536, udp); 2578 } 2579 2580 #ifdef INET6 2581 static void 2582 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 2583 { 2584 struct pf_addr ao; 2585 2586 PF_ACPY(&ao, a, AF_INET6); 2587 PF_ACPY(a, an, AF_INET6); 2588 2589 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2590 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2591 pf_cksum_fixup(pf_cksum_fixup(*c, 2592 ao.addr16[0], an->addr16[0], u), 2593 ao.addr16[1], an->addr16[1], u), 2594 ao.addr16[2], an->addr16[2], u), 2595 ao.addr16[3], an->addr16[3], u), 2596 ao.addr16[4], an->addr16[4], u), 2597 ao.addr16[5], an->addr16[5], u), 2598 ao.addr16[6], an->addr16[6], u), 2599 ao.addr16[7], an->addr16[7], u); 2600 } 2601 #endif /* INET6 */ 2602 2603 static void 2604 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 2605 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 2606 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 2607 { 2608 struct pf_addr oia, ooa; 2609 2610 PF_ACPY(&oia, ia, af); 2611 if (oa) 2612 PF_ACPY(&ooa, oa, af); 2613 2614 /* Change inner protocol port, fix inner protocol checksum. */ 2615 if (ip != NULL) { 2616 u_int16_t oip = *ip; 2617 u_int32_t opc; 2618 2619 if (pc != NULL) 2620 opc = *pc; 2621 *ip = np; 2622 if (pc != NULL) 2623 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 2624 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 2625 if (pc != NULL) 2626 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 2627 } 2628 /* Change inner ip address, fix inner ip and icmp checksums. */ 2629 PF_ACPY(ia, na, af); 2630 switch (af) { 2631 #ifdef INET 2632 case AF_INET: { 2633 u_int32_t oh2c = *h2c; 2634 2635 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 2636 oia.addr16[0], ia->addr16[0], 0), 2637 oia.addr16[1], ia->addr16[1], 0); 2638 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 2639 oia.addr16[0], ia->addr16[0], 0), 2640 oia.addr16[1], ia->addr16[1], 0); 2641 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 2642 break; 2643 } 2644 #endif /* INET */ 2645 #ifdef INET6 2646 case AF_INET6: 2647 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2648 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2649 pf_cksum_fixup(pf_cksum_fixup(*ic, 2650 oia.addr16[0], ia->addr16[0], u), 2651 oia.addr16[1], ia->addr16[1], u), 2652 oia.addr16[2], ia->addr16[2], u), 2653 oia.addr16[3], ia->addr16[3], u), 2654 oia.addr16[4], ia->addr16[4], u), 2655 oia.addr16[5], ia->addr16[5], u), 2656 oia.addr16[6], ia->addr16[6], u), 2657 oia.addr16[7], ia->addr16[7], u); 2658 break; 2659 #endif /* INET6 */ 2660 } 2661 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ 2662 if (oa) { 2663 PF_ACPY(oa, na, af); 2664 switch (af) { 2665 #ifdef INET 2666 case AF_INET: 2667 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 2668 ooa.addr16[0], oa->addr16[0], 0), 2669 ooa.addr16[1], oa->addr16[1], 0); 2670 break; 2671 #endif /* INET */ 2672 #ifdef INET6 2673 case AF_INET6: 2674 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2675 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 2676 pf_cksum_fixup(pf_cksum_fixup(*ic, 2677 ooa.addr16[0], oa->addr16[0], u), 2678 ooa.addr16[1], oa->addr16[1], u), 2679 ooa.addr16[2], oa->addr16[2], u), 2680 ooa.addr16[3], oa->addr16[3], u), 2681 ooa.addr16[4], oa->addr16[4], u), 2682 ooa.addr16[5], oa->addr16[5], u), 2683 ooa.addr16[6], oa->addr16[6], u), 2684 ooa.addr16[7], oa->addr16[7], u); 2685 break; 2686 #endif /* INET6 */ 2687 } 2688 } 2689 } 2690 2691 /* 2692 * Need to modulate the sequence numbers in the TCP SACK option 2693 * (credits to Krzysztof Pfaff for report and patch) 2694 */ 2695 static int 2696 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 2697 struct tcphdr *th, struct pf_state_peer *dst) 2698 { 2699 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 2700 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 2701 int copyback = 0, i, olen; 2702 struct sackblk sack; 2703 2704 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 2705 if (hlen < TCPOLEN_SACKLEN || 2706 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 2707 return 0; 2708 2709 while (hlen >= TCPOLEN_SACKLEN) { 2710 size_t startoff = opt - opts; 2711 olen = opt[1]; 2712 switch (*opt) { 2713 case TCPOPT_EOL: /* FALLTHROUGH */ 2714 case TCPOPT_NOP: 2715 opt++; 2716 hlen--; 2717 break; 2718 case TCPOPT_SACK: 2719 if (olen > hlen) 2720 olen = hlen; 2721 if (olen >= TCPOLEN_SACKLEN) { 2722 for (i = 2; i + TCPOLEN_SACK <= olen; 2723 i += TCPOLEN_SACK) { 2724 memcpy(&sack, &opt[i], sizeof(sack)); 2725 pf_patch_32_unaligned(m, 2726 &th->th_sum, &sack.start, 2727 htonl(ntohl(sack.start) - dst->seqdiff), 2728 PF_ALGNMNT(startoff), 2729 0); 2730 pf_patch_32_unaligned(m, &th->th_sum, 2731 &sack.end, 2732 htonl(ntohl(sack.end) - dst->seqdiff), 2733 PF_ALGNMNT(startoff), 2734 0); 2735 memcpy(&opt[i], &sack, sizeof(sack)); 2736 } 2737 copyback = 1; 2738 } 2739 /* FALLTHROUGH */ 2740 default: 2741 if (olen < 2) 2742 olen = 2; 2743 hlen -= olen; 2744 opt += olen; 2745 } 2746 } 2747 2748 if (copyback) 2749 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 2750 return (copyback); 2751 } 2752 2753 struct mbuf * 2754 pf_build_tcp(const struct pf_krule *r, sa_family_t af, 2755 const struct pf_addr *saddr, const struct pf_addr *daddr, 2756 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2757 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2758 u_int16_t rtag) 2759 { 2760 struct mbuf *m; 2761 int len, tlen; 2762 #ifdef INET 2763 struct ip *h = NULL; 2764 #endif /* INET */ 2765 #ifdef INET6 2766 struct ip6_hdr *h6 = NULL; 2767 #endif /* INET6 */ 2768 struct tcphdr *th; 2769 char *opt; 2770 struct pf_mtag *pf_mtag; 2771 2772 len = 0; 2773 th = NULL; 2774 2775 /* maximum segment size tcp option */ 2776 tlen = sizeof(struct tcphdr); 2777 if (mss) 2778 tlen += 4; 2779 2780 switch (af) { 2781 #ifdef INET 2782 case AF_INET: 2783 len = sizeof(struct ip) + tlen; 2784 break; 2785 #endif /* INET */ 2786 #ifdef INET6 2787 case AF_INET6: 2788 len = sizeof(struct ip6_hdr) + tlen; 2789 break; 2790 #endif /* INET6 */ 2791 default: 2792 panic("%s: unsupported af %d", __func__, af); 2793 } 2794 2795 m = m_gethdr(M_NOWAIT, MT_DATA); 2796 if (m == NULL) 2797 return (NULL); 2798 2799 #ifdef MAC 2800 mac_netinet_firewall_send(m); 2801 #endif 2802 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 2803 m_freem(m); 2804 return (NULL); 2805 } 2806 if (tag) 2807 m->m_flags |= M_SKIP_FIREWALL; 2808 pf_mtag->tag = rtag; 2809 2810 if (r != NULL && r->rtableid >= 0) 2811 M_SETFIB(m, r->rtableid); 2812 2813 #ifdef ALTQ 2814 if (r != NULL && r->qid) { 2815 pf_mtag->qid = r->qid; 2816 2817 /* add hints for ecn */ 2818 pf_mtag->hdr = mtod(m, struct ip *); 2819 } 2820 #endif /* ALTQ */ 2821 m->m_data += max_linkhdr; 2822 m->m_pkthdr.len = m->m_len = len; 2823 /* The rest of the stack assumes a rcvif, so provide one. 2824 * This is a locally generated packet, so .. close enough. */ 2825 m->m_pkthdr.rcvif = V_loif; 2826 bzero(m->m_data, len); 2827 switch (af) { 2828 #ifdef INET 2829 case AF_INET: 2830 h = mtod(m, struct ip *); 2831 2832 /* IP header fields included in the TCP checksum */ 2833 h->ip_p = IPPROTO_TCP; 2834 h->ip_len = htons(tlen); 2835 h->ip_src.s_addr = saddr->v4.s_addr; 2836 h->ip_dst.s_addr = daddr->v4.s_addr; 2837 2838 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 2839 break; 2840 #endif /* INET */ 2841 #ifdef INET6 2842 case AF_INET6: 2843 h6 = mtod(m, struct ip6_hdr *); 2844 2845 /* IP header fields included in the TCP checksum */ 2846 h6->ip6_nxt = IPPROTO_TCP; 2847 h6->ip6_plen = htons(tlen); 2848 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 2849 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 2850 2851 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 2852 break; 2853 #endif /* INET6 */ 2854 } 2855 2856 /* TCP header */ 2857 th->th_sport = sport; 2858 th->th_dport = dport; 2859 th->th_seq = htonl(seq); 2860 th->th_ack = htonl(ack); 2861 th->th_off = tlen >> 2; 2862 th->th_flags = flags; 2863 th->th_win = htons(win); 2864 2865 if (mss) { 2866 opt = (char *)(th + 1); 2867 opt[0] = TCPOPT_MAXSEG; 2868 opt[1] = 4; 2869 HTONS(mss); 2870 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 2871 } 2872 2873 switch (af) { 2874 #ifdef INET 2875 case AF_INET: 2876 /* TCP checksum */ 2877 th->th_sum = in_cksum(m, len); 2878 2879 /* Finish the IP header */ 2880 h->ip_v = 4; 2881 h->ip_hl = sizeof(*h) >> 2; 2882 h->ip_tos = IPTOS_LOWDELAY; 2883 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0); 2884 h->ip_len = htons(len); 2885 h->ip_ttl = ttl ? ttl : V_ip_defttl; 2886 h->ip_sum = 0; 2887 break; 2888 #endif /* INET */ 2889 #ifdef INET6 2890 case AF_INET6: 2891 /* TCP checksum */ 2892 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2893 sizeof(struct ip6_hdr), tlen); 2894 2895 h6->ip6_vfc |= IPV6_VERSION; 2896 h6->ip6_hlim = IPV6_DEFHLIM; 2897 break; 2898 #endif /* INET6 */ 2899 } 2900 2901 return (m); 2902 } 2903 2904 void 2905 pf_send_tcp(const struct pf_krule *r, sa_family_t af, 2906 const struct pf_addr *saddr, const struct pf_addr *daddr, 2907 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 2908 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 2909 u_int16_t rtag) 2910 { 2911 struct pf_send_entry *pfse; 2912 struct mbuf *m; 2913 2914 m = pf_build_tcp(r, af, saddr, daddr, sport, dport, seq, ack, flags, 2915 win, mss, ttl, tag, rtag); 2916 if (m == NULL) 2917 return; 2918 2919 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 2920 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 2921 if (pfse == NULL) { 2922 m_freem(m); 2923 return; 2924 } 2925 2926 switch (af) { 2927 #ifdef INET 2928 case AF_INET: 2929 pfse->pfse_type = PFSE_IP; 2930 break; 2931 #endif /* INET */ 2932 #ifdef INET6 2933 case AF_INET6: 2934 pfse->pfse_type = PFSE_IP6; 2935 break; 2936 #endif /* INET6 */ 2937 } 2938 2939 pfse->pfse_m = m; 2940 pf_send(pfse); 2941 } 2942 2943 static void 2944 pf_return(struct pf_krule *r, struct pf_krule *nr, struct pf_pdesc *pd, 2945 struct pf_state_key *sk, int off, struct mbuf *m, struct tcphdr *th, 2946 struct pfi_kkif *kif, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen, 2947 u_short *reason) 2948 { 2949 struct pf_addr * const saddr = pd->src; 2950 struct pf_addr * const daddr = pd->dst; 2951 sa_family_t af = pd->af; 2952 2953 /* undo NAT changes, if they have taken place */ 2954 if (nr != NULL) { 2955 PF_ACPY(saddr, &sk->addr[pd->sidx], af); 2956 PF_ACPY(daddr, &sk->addr[pd->didx], af); 2957 if (pd->sport) 2958 *pd->sport = sk->port[pd->sidx]; 2959 if (pd->dport) 2960 *pd->dport = sk->port[pd->didx]; 2961 if (pd->proto_sum) 2962 *pd->proto_sum = bproto_sum; 2963 if (pd->ip_sum) 2964 *pd->ip_sum = bip_sum; 2965 m_copyback(m, off, hdrlen, pd->hdr.any); 2966 } 2967 if (pd->proto == IPPROTO_TCP && 2968 ((r->rule_flag & PFRULE_RETURNRST) || 2969 (r->rule_flag & PFRULE_RETURN)) && 2970 !(th->th_flags & TH_RST)) { 2971 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 2972 int len = 0; 2973 #ifdef INET 2974 struct ip *h4; 2975 #endif 2976 #ifdef INET6 2977 struct ip6_hdr *h6; 2978 #endif 2979 2980 switch (af) { 2981 #ifdef INET 2982 case AF_INET: 2983 h4 = mtod(m, struct ip *); 2984 len = ntohs(h4->ip_len) - off; 2985 break; 2986 #endif 2987 #ifdef INET6 2988 case AF_INET6: 2989 h6 = mtod(m, struct ip6_hdr *); 2990 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); 2991 break; 2992 #endif 2993 } 2994 2995 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) 2996 REASON_SET(reason, PFRES_PROTCKSUM); 2997 else { 2998 if (th->th_flags & TH_SYN) 2999 ack++; 3000 if (th->th_flags & TH_FIN) 3001 ack++; 3002 pf_send_tcp(r, af, pd->dst, 3003 pd->src, th->th_dport, th->th_sport, 3004 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3005 r->return_ttl, 1, 0); 3006 } 3007 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && 3008 r->return_icmp) 3009 pf_send_icmp(m, r->return_icmp >> 8, 3010 r->return_icmp & 255, af, r); 3011 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && 3012 r->return_icmp6) 3013 pf_send_icmp(m, r->return_icmp6 >> 8, 3014 r->return_icmp6 & 255, af, r); 3015 } 3016 3017 static int 3018 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m) 3019 { 3020 struct m_tag *mtag; 3021 u_int8_t mpcp; 3022 3023 mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL); 3024 if (mtag == NULL) 3025 return (0); 3026 3027 if (prio == PF_PRIO_ZERO) 3028 prio = 0; 3029 3030 mpcp = *(uint8_t *)(mtag + 1); 3031 3032 return (mpcp == prio); 3033 } 3034 3035 static void 3036 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 3037 struct pf_krule *r) 3038 { 3039 struct pf_send_entry *pfse; 3040 struct mbuf *m0; 3041 struct pf_mtag *pf_mtag; 3042 3043 /* Allocate outgoing queue entry, mbuf and mbuf tag. */ 3044 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT); 3045 if (pfse == NULL) 3046 return; 3047 3048 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) { 3049 free(pfse, M_PFTEMP); 3050 return; 3051 } 3052 3053 if ((pf_mtag = pf_get_mtag(m0)) == NULL) { 3054 free(pfse, M_PFTEMP); 3055 return; 3056 } 3057 /* XXX: revisit */ 3058 m0->m_flags |= M_SKIP_FIREWALL; 3059 3060 if (r->rtableid >= 0) 3061 M_SETFIB(m0, r->rtableid); 3062 3063 #ifdef ALTQ 3064 if (r->qid) { 3065 pf_mtag->qid = r->qid; 3066 /* add hints for ecn */ 3067 pf_mtag->hdr = mtod(m0, struct ip *); 3068 } 3069 #endif /* ALTQ */ 3070 3071 switch (af) { 3072 #ifdef INET 3073 case AF_INET: 3074 pfse->pfse_type = PFSE_ICMP; 3075 break; 3076 #endif /* INET */ 3077 #ifdef INET6 3078 case AF_INET6: 3079 pfse->pfse_type = PFSE_ICMP6; 3080 break; 3081 #endif /* INET6 */ 3082 } 3083 pfse->pfse_m = m0; 3084 pfse->icmpopts.type = type; 3085 pfse->icmpopts.code = code; 3086 pf_send(pfse); 3087 } 3088 3089 /* 3090 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 3091 * If n is 0, they match if they are equal. If n is != 0, they match if they 3092 * are different. 3093 */ 3094 int 3095 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 3096 struct pf_addr *b, sa_family_t af) 3097 { 3098 int match = 0; 3099 3100 switch (af) { 3101 #ifdef INET 3102 case AF_INET: 3103 if ((a->addr32[0] & m->addr32[0]) == 3104 (b->addr32[0] & m->addr32[0])) 3105 match++; 3106 break; 3107 #endif /* INET */ 3108 #ifdef INET6 3109 case AF_INET6: 3110 if (((a->addr32[0] & m->addr32[0]) == 3111 (b->addr32[0] & m->addr32[0])) && 3112 ((a->addr32[1] & m->addr32[1]) == 3113 (b->addr32[1] & m->addr32[1])) && 3114 ((a->addr32[2] & m->addr32[2]) == 3115 (b->addr32[2] & m->addr32[2])) && 3116 ((a->addr32[3] & m->addr32[3]) == 3117 (b->addr32[3] & m->addr32[3]))) 3118 match++; 3119 break; 3120 #endif /* INET6 */ 3121 } 3122 if (match) { 3123 if (n) 3124 return (0); 3125 else 3126 return (1); 3127 } else { 3128 if (n) 3129 return (1); 3130 else 3131 return (0); 3132 } 3133 } 3134 3135 /* 3136 * Return 1 if b <= a <= e, otherwise return 0. 3137 */ 3138 int 3139 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, 3140 struct pf_addr *a, sa_family_t af) 3141 { 3142 switch (af) { 3143 #ifdef INET 3144 case AF_INET: 3145 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) || 3146 (ntohl(a->addr32[0]) > ntohl(e->addr32[0]))) 3147 return (0); 3148 break; 3149 #endif /* INET */ 3150 #ifdef INET6 3151 case AF_INET6: { 3152 int i; 3153 3154 /* check a >= b */ 3155 for (i = 0; i < 4; ++i) 3156 if (ntohl(a->addr32[i]) > ntohl(b->addr32[i])) 3157 break; 3158 else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i])) 3159 return (0); 3160 /* check a <= e */ 3161 for (i = 0; i < 4; ++i) 3162 if (ntohl(a->addr32[i]) < ntohl(e->addr32[i])) 3163 break; 3164 else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i])) 3165 return (0); 3166 break; 3167 } 3168 #endif /* INET6 */ 3169 } 3170 return (1); 3171 } 3172 3173 static int 3174 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 3175 { 3176 switch (op) { 3177 case PF_OP_IRG: 3178 return ((p > a1) && (p < a2)); 3179 case PF_OP_XRG: 3180 return ((p < a1) || (p > a2)); 3181 case PF_OP_RRG: 3182 return ((p >= a1) && (p <= a2)); 3183 case PF_OP_EQ: 3184 return (p == a1); 3185 case PF_OP_NE: 3186 return (p != a1); 3187 case PF_OP_LT: 3188 return (p < a1); 3189 case PF_OP_LE: 3190 return (p <= a1); 3191 case PF_OP_GT: 3192 return (p > a1); 3193 case PF_OP_GE: 3194 return (p >= a1); 3195 } 3196 return (0); /* never reached */ 3197 } 3198 3199 int 3200 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 3201 { 3202 NTOHS(a1); 3203 NTOHS(a2); 3204 NTOHS(p); 3205 return (pf_match(op, a1, a2, p)); 3206 } 3207 3208 static int 3209 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 3210 { 3211 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 3212 return (0); 3213 return (pf_match(op, a1, a2, u)); 3214 } 3215 3216 static int 3217 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 3218 { 3219 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 3220 return (0); 3221 return (pf_match(op, a1, a2, g)); 3222 } 3223 3224 int 3225 pf_match_tag(struct mbuf *m, struct pf_krule *r, int *tag, int mtag) 3226 { 3227 if (*tag == -1) 3228 *tag = mtag; 3229 3230 return ((!r->match_tag_not && r->match_tag == *tag) || 3231 (r->match_tag_not && r->match_tag != *tag)); 3232 } 3233 3234 int 3235 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag) 3236 { 3237 3238 KASSERT(tag > 0, ("%s: tag %d", __func__, tag)); 3239 3240 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL)) 3241 return (ENOMEM); 3242 3243 pd->pf_mtag->tag = tag; 3244 3245 return (0); 3246 } 3247 3248 #define PF_ANCHOR_STACKSIZE 32 3249 struct pf_kanchor_stackframe { 3250 struct pf_kruleset *rs; 3251 struct pf_krule *r; /* XXX: + match bit */ 3252 struct pf_kanchor *child; 3253 }; 3254 3255 /* 3256 * XXX: We rely on malloc(9) returning pointer aligned addresses. 3257 */ 3258 #define PF_ANCHORSTACK_MATCH 0x00000001 3259 #define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH) 3260 3261 #define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH) 3262 #define PF_ANCHOR_RULE(f) (struct pf_krule *) \ 3263 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK) 3264 #define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \ 3265 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \ 3266 } while (0) 3267 3268 void 3269 pf_step_into_anchor(struct pf_kanchor_stackframe *stack, int *depth, 3270 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, 3271 int *match) 3272 { 3273 struct pf_kanchor_stackframe *f; 3274 3275 PF_RULES_RASSERT(); 3276 3277 if (match) 3278 *match = 0; 3279 if (*depth >= PF_ANCHOR_STACKSIZE) { 3280 printf("%s: anchor stack overflow on %s\n", 3281 __func__, (*r)->anchor->name); 3282 *r = TAILQ_NEXT(*r, entries); 3283 return; 3284 } else if (*depth == 0 && a != NULL) 3285 *a = *r; 3286 f = stack + (*depth)++; 3287 f->rs = *rs; 3288 f->r = *r; 3289 if ((*r)->anchor_wildcard) { 3290 struct pf_kanchor_node *parent = &(*r)->anchor->children; 3291 3292 if ((f->child = RB_MIN(pf_kanchor_node, parent)) == NULL) { 3293 *r = NULL; 3294 return; 3295 } 3296 *rs = &f->child->ruleset; 3297 } else { 3298 f->child = NULL; 3299 *rs = &(*r)->anchor->ruleset; 3300 } 3301 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 3302 } 3303 3304 int 3305 pf_step_out_of_anchor(struct pf_kanchor_stackframe *stack, int *depth, 3306 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a, 3307 int *match) 3308 { 3309 struct pf_kanchor_stackframe *f; 3310 struct pf_krule *fr; 3311 int quick = 0; 3312 3313 PF_RULES_RASSERT(); 3314 3315 do { 3316 if (*depth <= 0) 3317 break; 3318 f = stack + *depth - 1; 3319 fr = PF_ANCHOR_RULE(f); 3320 if (f->child != NULL) { 3321 struct pf_kanchor_node *parent; 3322 3323 /* 3324 * This block traverses through 3325 * a wildcard anchor. 3326 */ 3327 parent = &fr->anchor->children; 3328 if (match != NULL && *match) { 3329 /* 3330 * If any of "*" matched, then 3331 * "foo/ *" matched, mark frame 3332 * appropriately. 3333 */ 3334 PF_ANCHOR_SET_MATCH(f); 3335 *match = 0; 3336 } 3337 f->child = RB_NEXT(pf_kanchor_node, parent, f->child); 3338 if (f->child != NULL) { 3339 *rs = &f->child->ruleset; 3340 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 3341 if (*r == NULL) 3342 continue; 3343 else 3344 break; 3345 } 3346 } 3347 (*depth)--; 3348 if (*depth == 0 && a != NULL) 3349 *a = NULL; 3350 *rs = f->rs; 3351 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match)) 3352 quick = fr->quick; 3353 *r = TAILQ_NEXT(fr, entries); 3354 } while (*r == NULL); 3355 3356 return (quick); 3357 } 3358 3359 #ifdef INET6 3360 void 3361 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 3362 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 3363 { 3364 switch (af) { 3365 #ifdef INET 3366 case AF_INET: 3367 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3368 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3369 break; 3370 #endif /* INET */ 3371 case AF_INET6: 3372 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 3373 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 3374 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 3375 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 3376 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 3377 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 3378 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 3379 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 3380 break; 3381 } 3382 } 3383 3384 void 3385 pf_addr_inc(struct pf_addr *addr, sa_family_t af) 3386 { 3387 switch (af) { 3388 #ifdef INET 3389 case AF_INET: 3390 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 3391 break; 3392 #endif /* INET */ 3393 case AF_INET6: 3394 if (addr->addr32[3] == 0xffffffff) { 3395 addr->addr32[3] = 0; 3396 if (addr->addr32[2] == 0xffffffff) { 3397 addr->addr32[2] = 0; 3398 if (addr->addr32[1] == 0xffffffff) { 3399 addr->addr32[1] = 0; 3400 addr->addr32[0] = 3401 htonl(ntohl(addr->addr32[0]) + 1); 3402 } else 3403 addr->addr32[1] = 3404 htonl(ntohl(addr->addr32[1]) + 1); 3405 } else 3406 addr->addr32[2] = 3407 htonl(ntohl(addr->addr32[2]) + 1); 3408 } else 3409 addr->addr32[3] = 3410 htonl(ntohl(addr->addr32[3]) + 1); 3411 break; 3412 } 3413 } 3414 #endif /* INET6 */ 3415 3416 void 3417 pf_rule_to_actions(struct pf_krule *r, struct pf_rule_actions *a) 3418 { 3419 if (r->qid) 3420 a->qid = r->qid; 3421 if (r->pqid) 3422 a->pqid = r->pqid; 3423 if (r->dnpipe) 3424 a->dnpipe = r->dnpipe; 3425 if (r->dnrpipe) 3426 a->dnpipe = r->dnrpipe; 3427 if (r->free_flags & PFRULE_DN_IS_PIPE) 3428 a->flags |= PFRULE_DN_IS_PIPE; 3429 } 3430 3431 int 3432 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m) 3433 { 3434 struct pf_addr *saddr, *daddr; 3435 u_int16_t sport, dport; 3436 struct inpcbinfo *pi; 3437 struct inpcb *inp; 3438 3439 pd->lookup.uid = UID_MAX; 3440 pd->lookup.gid = GID_MAX; 3441 3442 switch (pd->proto) { 3443 case IPPROTO_TCP: 3444 sport = pd->hdr.tcp.th_sport; 3445 dport = pd->hdr.tcp.th_dport; 3446 pi = &V_tcbinfo; 3447 break; 3448 case IPPROTO_UDP: 3449 sport = pd->hdr.udp.uh_sport; 3450 dport = pd->hdr.udp.uh_dport; 3451 pi = &V_udbinfo; 3452 break; 3453 default: 3454 return (-1); 3455 } 3456 if (direction == PF_IN) { 3457 saddr = pd->src; 3458 daddr = pd->dst; 3459 } else { 3460 u_int16_t p; 3461 3462 p = sport; 3463 sport = dport; 3464 dport = p; 3465 saddr = pd->dst; 3466 daddr = pd->src; 3467 } 3468 switch (pd->af) { 3469 #ifdef INET 3470 case AF_INET: 3471 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4, 3472 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3473 if (inp == NULL) { 3474 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, 3475 daddr->v4, dport, INPLOOKUP_WILDCARD | 3476 INPLOOKUP_RLOCKPCB, NULL, m); 3477 if (inp == NULL) 3478 return (-1); 3479 } 3480 break; 3481 #endif /* INET */ 3482 #ifdef INET6 3483 case AF_INET6: 3484 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6, 3485 dport, INPLOOKUP_RLOCKPCB, NULL, m); 3486 if (inp == NULL) { 3487 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, 3488 &daddr->v6, dport, INPLOOKUP_WILDCARD | 3489 INPLOOKUP_RLOCKPCB, NULL, m); 3490 if (inp == NULL) 3491 return (-1); 3492 } 3493 break; 3494 #endif /* INET6 */ 3495 3496 default: 3497 return (-1); 3498 } 3499 INP_RLOCK_ASSERT(inp); 3500 pd->lookup.uid = inp->inp_cred->cr_uid; 3501 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3502 INP_RUNLOCK(inp); 3503 3504 return (1); 3505 } 3506 3507 u_int8_t 3508 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3509 { 3510 int hlen; 3511 u_int8_t hdr[60]; 3512 u_int8_t *opt, optlen; 3513 u_int8_t wscale = 0; 3514 3515 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3516 if (hlen <= sizeof(struct tcphdr)) 3517 return (0); 3518 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3519 return (0); 3520 opt = hdr + sizeof(struct tcphdr); 3521 hlen -= sizeof(struct tcphdr); 3522 while (hlen >= 3) { 3523 switch (*opt) { 3524 case TCPOPT_EOL: 3525 case TCPOPT_NOP: 3526 ++opt; 3527 --hlen; 3528 break; 3529 case TCPOPT_WINDOW: 3530 wscale = opt[2]; 3531 if (wscale > TCP_MAX_WINSHIFT) 3532 wscale = TCP_MAX_WINSHIFT; 3533 wscale |= PF_WSCALE_FLAG; 3534 /* FALLTHROUGH */ 3535 default: 3536 optlen = opt[1]; 3537 if (optlen < 2) 3538 optlen = 2; 3539 hlen -= optlen; 3540 opt += optlen; 3541 break; 3542 } 3543 } 3544 return (wscale); 3545 } 3546 3547 u_int16_t 3548 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3549 { 3550 int hlen; 3551 u_int8_t hdr[60]; 3552 u_int8_t *opt, optlen; 3553 u_int16_t mss = V_tcp_mssdflt; 3554 3555 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3556 if (hlen <= sizeof(struct tcphdr)) 3557 return (0); 3558 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3559 return (0); 3560 opt = hdr + sizeof(struct tcphdr); 3561 hlen -= sizeof(struct tcphdr); 3562 while (hlen >= TCPOLEN_MAXSEG) { 3563 switch (*opt) { 3564 case TCPOPT_EOL: 3565 case TCPOPT_NOP: 3566 ++opt; 3567 --hlen; 3568 break; 3569 case TCPOPT_MAXSEG: 3570 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3571 NTOHS(mss); 3572 /* FALLTHROUGH */ 3573 default: 3574 optlen = opt[1]; 3575 if (optlen < 2) 3576 optlen = 2; 3577 hlen -= optlen; 3578 opt += optlen; 3579 break; 3580 } 3581 } 3582 return (mss); 3583 } 3584 3585 static u_int16_t 3586 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) 3587 { 3588 struct nhop_object *nh; 3589 #ifdef INET6 3590 struct in6_addr dst6; 3591 uint32_t scopeid; 3592 #endif /* INET6 */ 3593 int hlen = 0; 3594 uint16_t mss = 0; 3595 3596 NET_EPOCH_ASSERT(); 3597 3598 switch (af) { 3599 #ifdef INET 3600 case AF_INET: 3601 hlen = sizeof(struct ip); 3602 nh = fib4_lookup(rtableid, addr->v4, 0, 0, 0); 3603 if (nh != NULL) 3604 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 3605 break; 3606 #endif /* INET */ 3607 #ifdef INET6 3608 case AF_INET6: 3609 hlen = sizeof(struct ip6_hdr); 3610 in6_splitscope(&addr->v6, &dst6, &scopeid); 3611 nh = fib6_lookup(rtableid, &dst6, scopeid, 0, 0); 3612 if (nh != NULL) 3613 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr); 3614 break; 3615 #endif /* INET6 */ 3616 } 3617 3618 mss = max(V_tcp_mssdflt, mss); 3619 mss = min(mss, offer); 3620 mss = max(mss, 64); /* sanity - at least max opt space */ 3621 return (mss); 3622 } 3623 3624 static u_int32_t 3625 pf_tcp_iss(struct pf_pdesc *pd) 3626 { 3627 MD5_CTX ctx; 3628 u_int32_t digest[4]; 3629 3630 if (V_pf_tcp_secret_init == 0) { 3631 arc4random_buf(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); 3632 MD5Init(&V_pf_tcp_secret_ctx); 3633 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, 3634 sizeof(V_pf_tcp_secret)); 3635 V_pf_tcp_secret_init = 1; 3636 } 3637 3638 ctx = V_pf_tcp_secret_ctx; 3639 3640 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_sport, sizeof(u_short)); 3641 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_dport, sizeof(u_short)); 3642 if (pd->af == AF_INET6) { 3643 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); 3644 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); 3645 } else { 3646 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); 3647 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); 3648 } 3649 MD5Final((u_char *)digest, &ctx); 3650 V_pf_tcp_iss_off += 4096; 3651 #define ISN_RANDOM_INCREMENT (4096 - 1) 3652 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + 3653 V_pf_tcp_iss_off); 3654 #undef ISN_RANDOM_INCREMENT 3655 } 3656 3657 static int 3658 pf_test_rule(struct pf_krule **rm, struct pf_kstate **sm, int direction, 3659 struct pfi_kkif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, 3660 struct pf_krule **am, struct pf_kruleset **rsm, struct inpcb *inp) 3661 { 3662 struct pf_krule *nr = NULL; 3663 struct pf_addr * const saddr = pd->src; 3664 struct pf_addr * const daddr = pd->dst; 3665 sa_family_t af = pd->af; 3666 struct pf_krule *r, *a = NULL; 3667 struct pf_kruleset *ruleset = NULL; 3668 struct pf_ksrc_node *nsn = NULL; 3669 struct tcphdr *th = &pd->hdr.tcp; 3670 struct pf_state_key *sk = NULL, *nk = NULL; 3671 u_short reason; 3672 int rewrite = 0, hdrlen = 0; 3673 int tag = -1, rtableid = -1; 3674 int asd = 0; 3675 int match = 0; 3676 int state_icmp = 0; 3677 u_int16_t sport = 0, dport = 0; 3678 u_int16_t bproto_sum = 0, bip_sum = 0; 3679 u_int8_t icmptype = 0, icmpcode = 0; 3680 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 3681 3682 PF_RULES_RASSERT(); 3683 3684 if (inp != NULL) { 3685 INP_LOCK_ASSERT(inp); 3686 pd->lookup.uid = inp->inp_cred->cr_uid; 3687 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3688 pd->lookup.done = 1; 3689 } 3690 3691 switch (pd->proto) { 3692 case IPPROTO_TCP: 3693 sport = th->th_sport; 3694 dport = th->th_dport; 3695 hdrlen = sizeof(*th); 3696 break; 3697 case IPPROTO_UDP: 3698 sport = pd->hdr.udp.uh_sport; 3699 dport = pd->hdr.udp.uh_dport; 3700 hdrlen = sizeof(pd->hdr.udp); 3701 break; 3702 #ifdef INET 3703 case IPPROTO_ICMP: 3704 if (pd->af != AF_INET) 3705 break; 3706 sport = dport = pd->hdr.icmp.icmp_id; 3707 hdrlen = sizeof(pd->hdr.icmp); 3708 icmptype = pd->hdr.icmp.icmp_type; 3709 icmpcode = pd->hdr.icmp.icmp_code; 3710 3711 if (icmptype == ICMP_UNREACH || 3712 icmptype == ICMP_SOURCEQUENCH || 3713 icmptype == ICMP_REDIRECT || 3714 icmptype == ICMP_TIMXCEED || 3715 icmptype == ICMP_PARAMPROB) 3716 state_icmp++; 3717 break; 3718 #endif /* INET */ 3719 #ifdef INET6 3720 case IPPROTO_ICMPV6: 3721 if (af != AF_INET6) 3722 break; 3723 sport = dport = pd->hdr.icmp6.icmp6_id; 3724 hdrlen = sizeof(pd->hdr.icmp6); 3725 icmptype = pd->hdr.icmp6.icmp6_type; 3726 icmpcode = pd->hdr.icmp6.icmp6_code; 3727 3728 if (icmptype == ICMP6_DST_UNREACH || 3729 icmptype == ICMP6_PACKET_TOO_BIG || 3730 icmptype == ICMP6_TIME_EXCEEDED || 3731 icmptype == ICMP6_PARAM_PROB) 3732 state_icmp++; 3733 break; 3734 #endif /* INET6 */ 3735 default: 3736 sport = dport = hdrlen = 0; 3737 break; 3738 } 3739 3740 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3741 3742 /* check packet for BINAT/NAT/RDR */ 3743 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk, 3744 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) { 3745 KASSERT(sk != NULL, ("%s: null sk", __func__)); 3746 KASSERT(nk != NULL, ("%s: null nk", __func__)); 3747 3748 if (nr->log) { 3749 PFLOG_PACKET(kif, m, af, direction, PFRES_MATCH, nr, a, 3750 ruleset, pd, 1); 3751 } 3752 3753 if (pd->ip_sum) 3754 bip_sum = *pd->ip_sum; 3755 3756 switch (pd->proto) { 3757 case IPPROTO_TCP: 3758 bproto_sum = th->th_sum; 3759 pd->proto_sum = &th->th_sum; 3760 3761 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3762 nk->port[pd->sidx] != sport) { 3763 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum, 3764 &th->th_sum, &nk->addr[pd->sidx], 3765 nk->port[pd->sidx], 0, af); 3766 pd->sport = &th->th_sport; 3767 sport = th->th_sport; 3768 } 3769 3770 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3771 nk->port[pd->didx] != dport) { 3772 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum, 3773 &th->th_sum, &nk->addr[pd->didx], 3774 nk->port[pd->didx], 0, af); 3775 dport = th->th_dport; 3776 pd->dport = &th->th_dport; 3777 } 3778 rewrite++; 3779 break; 3780 case IPPROTO_UDP: 3781 bproto_sum = pd->hdr.udp.uh_sum; 3782 pd->proto_sum = &pd->hdr.udp.uh_sum; 3783 3784 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || 3785 nk->port[pd->sidx] != sport) { 3786 pf_change_ap(m, saddr, &pd->hdr.udp.uh_sport, 3787 pd->ip_sum, &pd->hdr.udp.uh_sum, 3788 &nk->addr[pd->sidx], 3789 nk->port[pd->sidx], 1, af); 3790 sport = pd->hdr.udp.uh_sport; 3791 pd->sport = &pd->hdr.udp.uh_sport; 3792 } 3793 3794 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || 3795 nk->port[pd->didx] != dport) { 3796 pf_change_ap(m, daddr, &pd->hdr.udp.uh_dport, 3797 pd->ip_sum, &pd->hdr.udp.uh_sum, 3798 &nk->addr[pd->didx], 3799 nk->port[pd->didx], 1, af); 3800 dport = pd->hdr.udp.uh_dport; 3801 pd->dport = &pd->hdr.udp.uh_dport; 3802 } 3803 rewrite++; 3804 break; 3805 #ifdef INET 3806 case IPPROTO_ICMP: 3807 nk->port[0] = nk->port[1]; 3808 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) 3809 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 3810 nk->addr[pd->sidx].v4.s_addr, 0); 3811 3812 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) 3813 pf_change_a(&daddr->v4.s_addr, pd->ip_sum, 3814 nk->addr[pd->didx].v4.s_addr, 0); 3815 3816 if (nk->port[1] != pd->hdr.icmp.icmp_id) { 3817 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( 3818 pd->hdr.icmp.icmp_cksum, sport, 3819 nk->port[1], 0); 3820 pd->hdr.icmp.icmp_id = nk->port[1]; 3821 pd->sport = &pd->hdr.icmp.icmp_id; 3822 } 3823 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); 3824 break; 3825 #endif /* INET */ 3826 #ifdef INET6 3827 case IPPROTO_ICMPV6: 3828 nk->port[0] = nk->port[1]; 3829 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) 3830 pf_change_a6(saddr, &pd->hdr.icmp6.icmp6_cksum, 3831 &nk->addr[pd->sidx], 0); 3832 3833 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) 3834 pf_change_a6(daddr, &pd->hdr.icmp6.icmp6_cksum, 3835 &nk->addr[pd->didx], 0); 3836 rewrite++; 3837 break; 3838 #endif /* INET */ 3839 default: 3840 switch (af) { 3841 #ifdef INET 3842 case AF_INET: 3843 if (PF_ANEQ(saddr, 3844 &nk->addr[pd->sidx], AF_INET)) 3845 pf_change_a(&saddr->v4.s_addr, 3846 pd->ip_sum, 3847 nk->addr[pd->sidx].v4.s_addr, 0); 3848 3849 if (PF_ANEQ(daddr, 3850 &nk->addr[pd->didx], AF_INET)) 3851 pf_change_a(&daddr->v4.s_addr, 3852 pd->ip_sum, 3853 nk->addr[pd->didx].v4.s_addr, 0); 3854 break; 3855 #endif /* INET */ 3856 #ifdef INET6 3857 case AF_INET6: 3858 if (PF_ANEQ(saddr, 3859 &nk->addr[pd->sidx], AF_INET6)) 3860 PF_ACPY(saddr, &nk->addr[pd->sidx], af); 3861 3862 if (PF_ANEQ(daddr, 3863 &nk->addr[pd->didx], AF_INET6)) 3864 PF_ACPY(daddr, &nk->addr[pd->didx], af); 3865 break; 3866 #endif /* INET */ 3867 } 3868 break; 3869 } 3870 if (nr->natpass) 3871 r = NULL; 3872 pd->nat_rule = nr; 3873 } 3874 3875 while (r != NULL) { 3876 pf_counter_u64_add(&r->evaluations, 1); 3877 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 3878 r = r->skip[PF_SKIP_IFP].ptr; 3879 else if (r->direction && r->direction != direction) 3880 r = r->skip[PF_SKIP_DIR].ptr; 3881 else if (r->af && r->af != af) 3882 r = r->skip[PF_SKIP_AF].ptr; 3883 else if (r->proto && r->proto != pd->proto) 3884 r = r->skip[PF_SKIP_PROTO].ptr; 3885 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3886 r->src.neg, kif, M_GETFIB(m))) 3887 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3888 /* tcp/udp only. port_op always 0 in other cases */ 3889 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3890 r->src.port[0], r->src.port[1], sport)) 3891 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3892 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3893 r->dst.neg, NULL, M_GETFIB(m))) 3894 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3895 /* tcp/udp only. port_op always 0 in other cases */ 3896 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3897 r->dst.port[0], r->dst.port[1], dport)) 3898 r = r->skip[PF_SKIP_DST_PORT].ptr; 3899 /* icmp only. type always 0 in other cases */ 3900 else if (r->type && r->type != icmptype + 1) 3901 r = TAILQ_NEXT(r, entries); 3902 /* icmp only. type always 0 in other cases */ 3903 else if (r->code && r->code != icmpcode + 1) 3904 r = TAILQ_NEXT(r, entries); 3905 else if (r->tos && !(r->tos == pd->tos)) 3906 r = TAILQ_NEXT(r, entries); 3907 else if (r->rule_flag & PFRULE_FRAGMENT) 3908 r = TAILQ_NEXT(r, entries); 3909 else if (pd->proto == IPPROTO_TCP && 3910 (r->flagset & th->th_flags) != r->flags) 3911 r = TAILQ_NEXT(r, entries); 3912 /* tcp/udp only. uid.op always 0 in other cases */ 3913 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3914 pf_socket_lookup(direction, pd, m), 1)) && 3915 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3916 pd->lookup.uid)) 3917 r = TAILQ_NEXT(r, entries); 3918 /* tcp/udp only. gid.op always 0 in other cases */ 3919 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3920 pf_socket_lookup(direction, pd, m), 1)) && 3921 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3922 pd->lookup.gid)) 3923 r = TAILQ_NEXT(r, entries); 3924 else if (r->prio && 3925 !pf_match_ieee8021q_pcp(r->prio, m)) 3926 r = TAILQ_NEXT(r, entries); 3927 else if (r->prob && 3928 r->prob <= arc4random()) 3929 r = TAILQ_NEXT(r, entries); 3930 else if (r->match_tag && !pf_match_tag(m, r, &tag, 3931 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 3932 r = TAILQ_NEXT(r, entries); 3933 else if (r->os_fingerprint != PF_OSFP_ANY && 3934 (pd->proto != IPPROTO_TCP || !pf_osfp_match( 3935 pf_osfp_fingerprint(pd, m, off, th), 3936 r->os_fingerprint))) 3937 r = TAILQ_NEXT(r, entries); 3938 else { 3939 if (r->tag) 3940 tag = r->tag; 3941 if (r->rtableid >= 0) 3942 rtableid = r->rtableid; 3943 if (r->anchor == NULL) { 3944 if (r->action == PF_MATCH) { 3945 pf_counter_u64_critical_enter(); 3946 pf_counter_u64_add_protected(&r->packets[direction == PF_OUT], 1); 3947 pf_counter_u64_add_protected(&r->bytes[direction == PF_OUT], pd->tot_len); 3948 pf_counter_u64_critical_exit(); 3949 pf_rule_to_actions(r, &pd->act); 3950 if (r->log) 3951 PFLOG_PACKET(kif, m, af, 3952 direction, PFRES_MATCH, r, 3953 a, ruleset, pd, 1); 3954 } else { 3955 match = 1; 3956 *rm = r; 3957 *am = a; 3958 *rsm = ruleset; 3959 } 3960 if ((*rm)->quick) 3961 break; 3962 r = TAILQ_NEXT(r, entries); 3963 } else 3964 pf_step_into_anchor(anchor_stack, &asd, 3965 &ruleset, PF_RULESET_FILTER, &r, &a, 3966 &match); 3967 } 3968 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 3969 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 3970 break; 3971 } 3972 r = *rm; 3973 a = *am; 3974 ruleset = *rsm; 3975 3976 REASON_SET(&reason, PFRES_MATCH); 3977 3978 /* apply actions for last matching pass/block rule */ 3979 pf_rule_to_actions(r, &pd->act); 3980 3981 if (r->log) { 3982 if (rewrite) 3983 m_copyback(m, off, hdrlen, pd->hdr.any); 3984 PFLOG_PACKET(kif, m, af, direction, reason, r, a, 3985 ruleset, pd, 1); 3986 } 3987 3988 if ((r->action == PF_DROP) && 3989 ((r->rule_flag & PFRULE_RETURNRST) || 3990 (r->rule_flag & PFRULE_RETURNICMP) || 3991 (r->rule_flag & PFRULE_RETURN))) { 3992 pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum, 3993 bip_sum, hdrlen, &reason); 3994 } 3995 3996 if (r->action == PF_DROP) 3997 goto cleanup; 3998 3999 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 4000 REASON_SET(&reason, PFRES_MEMORY); 4001 goto cleanup; 4002 } 4003 if (rtableid >= 0) 4004 M_SETFIB(m, rtableid); 4005 4006 if (!state_icmp && (r->keep_state || nr != NULL || 4007 (pd->flags & PFDESC_TCP_NORM))) { 4008 int action; 4009 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off, 4010 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, 4011 hdrlen); 4012 if (action != PF_PASS) { 4013 if (action == PF_DROP && 4014 (r->rule_flag & PFRULE_RETURN)) 4015 pf_return(r, nr, pd, sk, off, m, th, kif, 4016 bproto_sum, bip_sum, hdrlen, &reason); 4017 return (action); 4018 } 4019 } else { 4020 if (sk != NULL) 4021 uma_zfree(V_pf_state_key_z, sk); 4022 if (nk != NULL) 4023 uma_zfree(V_pf_state_key_z, nk); 4024 } 4025 4026 /* copy back packet headers if we performed NAT operations */ 4027 if (rewrite) 4028 m_copyback(m, off, hdrlen, pd->hdr.any); 4029 4030 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) && 4031 direction == PF_OUT && 4032 V_pfsync_defer_ptr != NULL && V_pfsync_defer_ptr(*sm, m)) 4033 /* 4034 * We want the state created, but we dont 4035 * want to send this in case a partner 4036 * firewall has to know about it to allow 4037 * replies through it. 4038 */ 4039 return (PF_DEFER); 4040 4041 return (PF_PASS); 4042 4043 cleanup: 4044 if (sk != NULL) 4045 uma_zfree(V_pf_state_key_z, sk); 4046 if (nk != NULL) 4047 uma_zfree(V_pf_state_key_z, nk); 4048 return (PF_DROP); 4049 } 4050 4051 static int 4052 pf_create_state(struct pf_krule *r, struct pf_krule *nr, struct pf_krule *a, 4053 struct pf_pdesc *pd, struct pf_ksrc_node *nsn, struct pf_state_key *nk, 4054 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, 4055 u_int16_t dport, int *rewrite, struct pfi_kkif *kif, struct pf_kstate **sm, 4056 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) 4057 { 4058 struct pf_kstate *s = NULL; 4059 struct pf_ksrc_node *sn = NULL; 4060 struct tcphdr *th = &pd->hdr.tcp; 4061 u_int16_t mss = V_tcp_mssdflt; 4062 u_short reason; 4063 4064 /* check maximums */ 4065 if (r->max_states && 4066 (counter_u64_fetch(r->states_cur) >= r->max_states)) { 4067 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1); 4068 REASON_SET(&reason, PFRES_MAXSTATES); 4069 goto csfailed; 4070 } 4071 /* src node for filter rule */ 4072 if ((r->rule_flag & PFRULE_SRCTRACK || 4073 r->rpool.opts & PF_POOL_STICKYADDR) && 4074 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { 4075 REASON_SET(&reason, PFRES_SRCLIMIT); 4076 goto csfailed; 4077 } 4078 /* src node for translation rule */ 4079 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4080 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { 4081 REASON_SET(&reason, PFRES_SRCLIMIT); 4082 goto csfailed; 4083 } 4084 s = pf_alloc_state(M_NOWAIT); 4085 if (s == NULL) { 4086 REASON_SET(&reason, PFRES_MEMORY); 4087 goto csfailed; 4088 } 4089 s->rule.ptr = r; 4090 s->nat_rule.ptr = nr; 4091 s->anchor.ptr = a; 4092 STATE_INC_COUNTERS(s); 4093 if (r->allow_opts) 4094 s->state_flags |= PFSTATE_ALLOWOPTS; 4095 if (r->rule_flag & PFRULE_STATESLOPPY) 4096 s->state_flags |= PFSTATE_SLOPPY; 4097 s->log = r->log & PF_LOG_ALL; 4098 s->sync_state = PFSYNC_S_NONE; 4099 s->qid = pd->act.qid; 4100 s->pqid = pd->act.pqid; 4101 s->dnpipe = pd->act.dnpipe; 4102 s->dnrpipe = pd->act.dnrpipe; 4103 s->state_flags |= pd->act.flags; 4104 if (nr != NULL) 4105 s->log |= nr->log & PF_LOG_ALL; 4106 switch (pd->proto) { 4107 case IPPROTO_TCP: 4108 s->src.seqlo = ntohl(th->th_seq); 4109 s->src.seqhi = s->src.seqlo + pd->p_len + 1; 4110 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 4111 r->keep_state == PF_STATE_MODULATE) { 4112 /* Generate sequence number modulator */ 4113 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 4114 0) 4115 s->src.seqdiff = 1; 4116 pf_change_proto_a(m, &th->th_seq, &th->th_sum, 4117 htonl(s->src.seqlo + s->src.seqdiff), 0); 4118 *rewrite = 1; 4119 } else 4120 s->src.seqdiff = 0; 4121 if (th->th_flags & TH_SYN) { 4122 s->src.seqhi++; 4123 s->src.wscale = pf_get_wscale(m, off, 4124 th->th_off, pd->af); 4125 } 4126 s->src.max_win = MAX(ntohs(th->th_win), 1); 4127 if (s->src.wscale & PF_WSCALE_MASK) { 4128 /* Remove scale factor from initial window */ 4129 int win = s->src.max_win; 4130 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 4131 s->src.max_win = (win - 1) >> 4132 (s->src.wscale & PF_WSCALE_MASK); 4133 } 4134 if (th->th_flags & TH_FIN) 4135 s->src.seqhi++; 4136 s->dst.seqhi = 1; 4137 s->dst.max_win = 1; 4138 pf_set_protostate(s, PF_PEER_SRC, TCPS_SYN_SENT); 4139 pf_set_protostate(s, PF_PEER_DST, TCPS_CLOSED); 4140 s->timeout = PFTM_TCP_FIRST_PACKET; 4141 atomic_add_32(&V_pf_status.states_halfopen, 1); 4142 break; 4143 case IPPROTO_UDP: 4144 pf_set_protostate(s, PF_PEER_SRC, PFUDPS_SINGLE); 4145 pf_set_protostate(s, PF_PEER_DST, PFUDPS_NO_TRAFFIC); 4146 s->timeout = PFTM_UDP_FIRST_PACKET; 4147 break; 4148 case IPPROTO_ICMP: 4149 #ifdef INET6 4150 case IPPROTO_ICMPV6: 4151 #endif 4152 s->timeout = PFTM_ICMP_FIRST_PACKET; 4153 break; 4154 default: 4155 pf_set_protostate(s, PF_PEER_SRC, PFOTHERS_SINGLE); 4156 pf_set_protostate(s, PF_PEER_DST, PFOTHERS_NO_TRAFFIC); 4157 s->timeout = PFTM_OTHER_FIRST_PACKET; 4158 } 4159 4160 if (r->rt) { 4161 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) { 4162 REASON_SET(&reason, PFRES_MAPFAILED); 4163 pf_src_tree_remove_state(s); 4164 s->timeout = PFTM_UNLINKED; 4165 STATE_DEC_COUNTERS(s); 4166 pf_free_state(s); 4167 goto csfailed; 4168 } 4169 s->rt_kif = r->rpool.cur->kif; 4170 } 4171 4172 s->creation = time_uptime; 4173 s->expire = time_uptime; 4174 4175 if (sn != NULL) 4176 s->src_node = sn; 4177 if (nsn != NULL) { 4178 /* XXX We only modify one side for now. */ 4179 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); 4180 s->nat_src_node = nsn; 4181 } 4182 if (pd->proto == IPPROTO_TCP) { 4183 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 4184 off, pd, th, &s->src, &s->dst)) { 4185 REASON_SET(&reason, PFRES_MEMORY); 4186 pf_src_tree_remove_state(s); 4187 s->timeout = PFTM_UNLINKED; 4188 STATE_DEC_COUNTERS(s); 4189 pf_free_state(s); 4190 return (PF_DROP); 4191 } 4192 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 4193 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 4194 &s->src, &s->dst, rewrite)) { 4195 /* This really shouldn't happen!!! */ 4196 DPFPRINTF(PF_DEBUG_URGENT, 4197 ("pf_normalize_tcp_stateful failed on first " 4198 "pkt\n")); 4199 pf_src_tree_remove_state(s); 4200 s->timeout = PFTM_UNLINKED; 4201 STATE_DEC_COUNTERS(s); 4202 pf_free_state(s); 4203 return (PF_DROP); 4204 } 4205 } 4206 s->direction = pd->dir; 4207 4208 /* 4209 * sk/nk could already been setup by pf_get_translation(). 4210 */ 4211 if (nr == NULL) { 4212 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p", 4213 __func__, nr, sk, nk)); 4214 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport); 4215 if (sk == NULL) 4216 goto csfailed; 4217 nk = sk; 4218 } else 4219 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p", 4220 __func__, nr, sk, nk)); 4221 4222 /* Swap sk/nk for PF_OUT. */ 4223 if (pf_state_insert(BOUND_IFACE(r, kif), kif, 4224 (pd->dir == PF_IN) ? sk : nk, 4225 (pd->dir == PF_IN) ? nk : sk, s)) { 4226 REASON_SET(&reason, PFRES_STATEINS); 4227 pf_src_tree_remove_state(s); 4228 s->timeout = PFTM_UNLINKED; 4229 STATE_DEC_COUNTERS(s); 4230 pf_free_state(s); 4231 return (PF_DROP); 4232 } else 4233 *sm = s; 4234 4235 if (tag > 0) 4236 s->tag = tag; 4237 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == 4238 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { 4239 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_SRC); 4240 /* undo NAT changes, if they have taken place */ 4241 if (nr != NULL) { 4242 struct pf_state_key *skt = s->key[PF_SK_WIRE]; 4243 if (pd->dir == PF_OUT) 4244 skt = s->key[PF_SK_STACK]; 4245 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); 4246 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); 4247 if (pd->sport) 4248 *pd->sport = skt->port[pd->sidx]; 4249 if (pd->dport) 4250 *pd->dport = skt->port[pd->didx]; 4251 if (pd->proto_sum) 4252 *pd->proto_sum = bproto_sum; 4253 if (pd->ip_sum) 4254 *pd->ip_sum = bip_sum; 4255 m_copyback(m, off, hdrlen, pd->hdr.any); 4256 } 4257 s->src.seqhi = htonl(arc4random()); 4258 /* Find mss option */ 4259 int rtid = M_GETFIB(m); 4260 mss = pf_get_mss(m, off, th->th_off, pd->af); 4261 mss = pf_calc_mss(pd->src, pd->af, rtid, mss); 4262 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); 4263 s->src.mss = mss; 4264 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport, 4265 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 4266 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0); 4267 REASON_SET(&reason, PFRES_SYNPROXY); 4268 return (PF_SYNPROXY_DROP); 4269 } 4270 4271 return (PF_PASS); 4272 4273 csfailed: 4274 if (sk != NULL) 4275 uma_zfree(V_pf_state_key_z, sk); 4276 if (nk != NULL) 4277 uma_zfree(V_pf_state_key_z, nk); 4278 4279 if (sn != NULL) { 4280 struct pf_srchash *sh; 4281 4282 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)]; 4283 PF_HASHROW_LOCK(sh); 4284 if (--sn->states == 0 && sn->expire == 0) { 4285 pf_unlink_src_node(sn); 4286 uma_zfree(V_pf_sources_z, sn); 4287 counter_u64_add( 4288 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 4289 } 4290 PF_HASHROW_UNLOCK(sh); 4291 } 4292 4293 if (nsn != sn && nsn != NULL) { 4294 struct pf_srchash *sh; 4295 4296 sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)]; 4297 PF_HASHROW_LOCK(sh); 4298 if (--nsn->states == 0 && nsn->expire == 0) { 4299 pf_unlink_src_node(nsn); 4300 uma_zfree(V_pf_sources_z, nsn); 4301 counter_u64_add( 4302 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1); 4303 } 4304 PF_HASHROW_UNLOCK(sh); 4305 } 4306 4307 return (PF_DROP); 4308 } 4309 4310 static int 4311 pf_test_fragment(struct pf_krule **rm, int direction, struct pfi_kkif *kif, 4312 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_krule **am, 4313 struct pf_kruleset **rsm) 4314 { 4315 struct pf_krule *r, *a = NULL; 4316 struct pf_kruleset *ruleset = NULL; 4317 sa_family_t af = pd->af; 4318 u_short reason; 4319 int tag = -1; 4320 int asd = 0; 4321 int match = 0; 4322 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; 4323 4324 PF_RULES_RASSERT(); 4325 4326 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4327 while (r != NULL) { 4328 pf_counter_u64_add(&r->evaluations, 1); 4329 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 4330 r = r->skip[PF_SKIP_IFP].ptr; 4331 else if (r->direction && r->direction != direction) 4332 r = r->skip[PF_SKIP_DIR].ptr; 4333 else if (r->af && r->af != af) 4334 r = r->skip[PF_SKIP_AF].ptr; 4335 else if (r->proto && r->proto != pd->proto) 4336 r = r->skip[PF_SKIP_PROTO].ptr; 4337 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4338 r->src.neg, kif, M_GETFIB(m))) 4339 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4340 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4341 r->dst.neg, NULL, M_GETFIB(m))) 4342 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4343 else if (r->tos && !(r->tos == pd->tos)) 4344 r = TAILQ_NEXT(r, entries); 4345 else if (r->os_fingerprint != PF_OSFP_ANY) 4346 r = TAILQ_NEXT(r, entries); 4347 else if (pd->proto == IPPROTO_UDP && 4348 (r->src.port_op || r->dst.port_op)) 4349 r = TAILQ_NEXT(r, entries); 4350 else if (pd->proto == IPPROTO_TCP && 4351 (r->src.port_op || r->dst.port_op || r->flagset)) 4352 r = TAILQ_NEXT(r, entries); 4353 else if ((pd->proto == IPPROTO_ICMP || 4354 pd->proto == IPPROTO_ICMPV6) && 4355 (r->type || r->code)) 4356 r = TAILQ_NEXT(r, entries); 4357 else if (r->prio && 4358 !pf_match_ieee8021q_pcp(r->prio, m)) 4359 r = TAILQ_NEXT(r, entries); 4360 else if (r->prob && r->prob <= 4361 (arc4random() % (UINT_MAX - 1) + 1)) 4362 r = TAILQ_NEXT(r, entries); 4363 else if (r->match_tag && !pf_match_tag(m, r, &tag, 4364 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 4365 r = TAILQ_NEXT(r, entries); 4366 else { 4367 if (r->anchor == NULL) { 4368 if (r->action == PF_MATCH) { 4369 pf_counter_u64_critical_enter(); 4370 pf_counter_u64_add_protected(&r->packets[direction == PF_OUT], 1); 4371 pf_counter_u64_add_protected(&r->bytes[direction == PF_OUT], pd->tot_len); 4372 pf_counter_u64_critical_exit(); 4373 pf_rule_to_actions(r, &pd->act); 4374 if (r->log) 4375 PFLOG_PACKET(kif, m, af, 4376 direction, PFRES_MATCH, r, 4377 a, ruleset, pd, 1); 4378 } else { 4379 match = 1; 4380 *rm = r; 4381 *am = a; 4382 *rsm = ruleset; 4383 } 4384 if ((*rm)->quick) 4385 break; 4386 r = TAILQ_NEXT(r, entries); 4387 } else 4388 pf_step_into_anchor(anchor_stack, &asd, 4389 &ruleset, PF_RULESET_FILTER, &r, &a, 4390 &match); 4391 } 4392 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd, 4393 &ruleset, PF_RULESET_FILTER, &r, &a, &match)) 4394 break; 4395 } 4396 r = *rm; 4397 a = *am; 4398 ruleset = *rsm; 4399 4400 REASON_SET(&reason, PFRES_MATCH); 4401 4402 /* apply actions for last matching pass/block rule */ 4403 pf_rule_to_actions(r, &pd->act); 4404 4405 if (r->log) 4406 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd, 4407 1); 4408 4409 if (r->action != PF_PASS) 4410 return (PF_DROP); 4411 4412 if (tag > 0 && pf_tag_packet(m, pd, tag)) { 4413 REASON_SET(&reason, PFRES_MEMORY); 4414 return (PF_DROP); 4415 } 4416 4417 return (PF_PASS); 4418 } 4419 4420 static int 4421 pf_tcp_track_full(struct pf_kstate **state, struct pfi_kkif *kif, 4422 struct mbuf *m, int off, struct pf_pdesc *pd, u_short *reason, 4423 int *copyback) 4424 { 4425 struct tcphdr *th = &pd->hdr.tcp; 4426 struct pf_state_peer *src, *dst; 4427 u_int16_t win = ntohs(th->th_win); 4428 u_int32_t ack, end, seq, orig_seq; 4429 u_int8_t sws, dws, psrc, pdst; 4430 int ackskew; 4431 4432 if (pd->dir == (*state)->direction) { 4433 src = &(*state)->src; 4434 dst = &(*state)->dst; 4435 psrc = PF_PEER_SRC; 4436 pdst = PF_PEER_DST; 4437 } else { 4438 src = &(*state)->dst; 4439 dst = &(*state)->src; 4440 psrc = PF_PEER_DST; 4441 pdst = PF_PEER_SRC; 4442 } 4443 4444 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4445 sws = src->wscale & PF_WSCALE_MASK; 4446 dws = dst->wscale & PF_WSCALE_MASK; 4447 } else 4448 sws = dws = 0; 4449 4450 /* 4451 * Sequence tracking algorithm from Guido van Rooij's paper: 4452 * http://www.madison-gurkha.com/publications/tcp_filtering/ 4453 * tcp_filtering.ps 4454 */ 4455 4456 orig_seq = seq = ntohl(th->th_seq); 4457 if (src->seqlo == 0) { 4458 /* First packet from this end. Set its state */ 4459 4460 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4461 src->scrub == NULL) { 4462 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4463 REASON_SET(reason, PFRES_MEMORY); 4464 return (PF_DROP); 4465 } 4466 } 4467 4468 /* Deferred generation of sequence number modulator */ 4469 if (dst->seqdiff && !src->seqdiff) { 4470 /* use random iss for the TCP server */ 4471 while ((src->seqdiff = arc4random() - seq) == 0) 4472 ; 4473 ack = ntohl(th->th_ack) - dst->seqdiff; 4474 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 4475 src->seqdiff), 0); 4476 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 4477 *copyback = 1; 4478 } else { 4479 ack = ntohl(th->th_ack); 4480 } 4481 4482 end = seq + pd->p_len; 4483 if (th->th_flags & TH_SYN) { 4484 end++; 4485 if (dst->wscale & PF_WSCALE_FLAG) { 4486 src->wscale = pf_get_wscale(m, off, th->th_off, 4487 pd->af); 4488 if (src->wscale & PF_WSCALE_FLAG) { 4489 /* Remove scale factor from initial 4490 * window */ 4491 sws = src->wscale & PF_WSCALE_MASK; 4492 win = ((u_int32_t)win + (1 << sws) - 1) 4493 >> sws; 4494 dws = dst->wscale & PF_WSCALE_MASK; 4495 } else { 4496 /* fixup other window */ 4497 dst->max_win <<= dst->wscale & 4498 PF_WSCALE_MASK; 4499 /* in case of a retrans SYN|ACK */ 4500 dst->wscale = 0; 4501 } 4502 } 4503 } 4504 if (th->th_flags & TH_FIN) 4505 end++; 4506 4507 src->seqlo = seq; 4508 if (src->state < TCPS_SYN_SENT) 4509 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 4510 4511 /* 4512 * May need to slide the window (seqhi may have been set by 4513 * the crappy stack check or if we picked up the connection 4514 * after establishment) 4515 */ 4516 if (src->seqhi == 1 || 4517 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4518 src->seqhi = end + MAX(1, dst->max_win << dws); 4519 if (win > src->max_win) 4520 src->max_win = win; 4521 4522 } else { 4523 ack = ntohl(th->th_ack) - dst->seqdiff; 4524 if (src->seqdiff) { 4525 /* Modulate sequence numbers */ 4526 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq + 4527 src->seqdiff), 0); 4528 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0); 4529 *copyback = 1; 4530 } 4531 end = seq + pd->p_len; 4532 if (th->th_flags & TH_SYN) 4533 end++; 4534 if (th->th_flags & TH_FIN) 4535 end++; 4536 } 4537 4538 if ((th->th_flags & TH_ACK) == 0) { 4539 /* Let it pass through the ack skew check */ 4540 ack = dst->seqlo; 4541 } else if ((ack == 0 && 4542 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4543 /* broken tcp stacks do not set ack */ 4544 (dst->state < TCPS_SYN_SENT)) { 4545 /* 4546 * Many stacks (ours included) will set the ACK number in an 4547 * FIN|ACK if the SYN times out -- no sequence to ACK. 4548 */ 4549 ack = dst->seqlo; 4550 } 4551 4552 if (seq == end) { 4553 /* Ease sequencing restrictions on no data packets */ 4554 seq = src->seqlo; 4555 end = seq; 4556 } 4557 4558 ackskew = dst->seqlo - ack; 4559 4560 /* 4561 * Need to demodulate the sequence numbers in any TCP SACK options 4562 * (Selective ACK). We could optionally validate the SACK values 4563 * against the current ACK window, either forwards or backwards, but 4564 * I'm not confident that SACK has been implemented properly 4565 * everywhere. It wouldn't surprise me if several stacks accidentally 4566 * SACK too far backwards of previously ACKed data. There really aren't 4567 * any security implications of bad SACKing unless the target stack 4568 * doesn't validate the option length correctly. Someone trying to 4569 * spoof into a TCP connection won't bother blindly sending SACK 4570 * options anyway. 4571 */ 4572 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4573 if (pf_modulate_sack(m, off, pd, th, dst)) 4574 *copyback = 1; 4575 } 4576 4577 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4578 if (SEQ_GEQ(src->seqhi, end) && 4579 /* Last octet inside other's window space */ 4580 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4581 /* Retrans: not more than one window back */ 4582 (ackskew >= -MAXACKWINDOW) && 4583 /* Acking not more than one reassembled fragment backwards */ 4584 (ackskew <= (MAXACKWINDOW << sws)) && 4585 /* Acking not more than one window forward */ 4586 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4587 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || 4588 (pd->flags & PFDESC_IP_REAS) == 0)) { 4589 /* Require an exact/+1 sequence match on resets when possible */ 4590 4591 if (dst->scrub || src->scrub) { 4592 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4593 *state, src, dst, copyback)) 4594 return (PF_DROP); 4595 } 4596 4597 /* update max window */ 4598 if (src->max_win < win) 4599 src->max_win = win; 4600 /* synchronize sequencing */ 4601 if (SEQ_GT(end, src->seqlo)) 4602 src->seqlo = end; 4603 /* slide the window of what the other end can send */ 4604 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4605 dst->seqhi = ack + MAX((win << sws), 1); 4606 4607 /* update states */ 4608 if (th->th_flags & TH_SYN) 4609 if (src->state < TCPS_SYN_SENT) 4610 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 4611 if (th->th_flags & TH_FIN) 4612 if (src->state < TCPS_CLOSING) 4613 pf_set_protostate(*state, psrc, TCPS_CLOSING); 4614 if (th->th_flags & TH_ACK) { 4615 if (dst->state == TCPS_SYN_SENT) { 4616 pf_set_protostate(*state, pdst, 4617 TCPS_ESTABLISHED); 4618 if (src->state == TCPS_ESTABLISHED && 4619 (*state)->src_node != NULL && 4620 pf_src_connlimit(state)) { 4621 REASON_SET(reason, PFRES_SRCLIMIT); 4622 return (PF_DROP); 4623 } 4624 } else if (dst->state == TCPS_CLOSING) 4625 pf_set_protostate(*state, pdst, 4626 TCPS_FIN_WAIT_2); 4627 } 4628 if (th->th_flags & TH_RST) 4629 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 4630 4631 /* update expire time */ 4632 (*state)->expire = time_uptime; 4633 if (src->state >= TCPS_FIN_WAIT_2 && 4634 dst->state >= TCPS_FIN_WAIT_2) 4635 (*state)->timeout = PFTM_TCP_CLOSED; 4636 else if (src->state >= TCPS_CLOSING && 4637 dst->state >= TCPS_CLOSING) 4638 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4639 else if (src->state < TCPS_ESTABLISHED || 4640 dst->state < TCPS_ESTABLISHED) 4641 (*state)->timeout = PFTM_TCP_OPENING; 4642 else if (src->state >= TCPS_CLOSING || 4643 dst->state >= TCPS_CLOSING) 4644 (*state)->timeout = PFTM_TCP_CLOSING; 4645 else 4646 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4647 4648 /* Fall through to PASS packet */ 4649 4650 } else if ((dst->state < TCPS_SYN_SENT || 4651 dst->state >= TCPS_FIN_WAIT_2 || 4652 src->state >= TCPS_FIN_WAIT_2) && 4653 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4654 /* Within a window forward of the originating packet */ 4655 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4656 /* Within a window backward of the originating packet */ 4657 4658 /* 4659 * This currently handles three situations: 4660 * 1) Stupid stacks will shotgun SYNs before their peer 4661 * replies. 4662 * 2) When PF catches an already established stream (the 4663 * firewall rebooted, the state table was flushed, routes 4664 * changed...) 4665 * 3) Packets get funky immediately after the connection 4666 * closes (this should catch Solaris spurious ACK|FINs 4667 * that web servers like to spew after a close) 4668 * 4669 * This must be a little more careful than the above code 4670 * since packet floods will also be caught here. We don't 4671 * update the TTL here to mitigate the damage of a packet 4672 * flood and so the same code can handle awkward establishment 4673 * and a loosened connection close. 4674 * In the establishment case, a correct peer response will 4675 * validate the connection, go through the normal state code 4676 * and keep updating the state TTL. 4677 */ 4678 4679 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4680 printf("pf: loose state match: "); 4681 pf_print_state(*state); 4682 pf_print_flags(th->th_flags); 4683 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4684 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, 4685 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], 4686 (unsigned long long)(*state)->packets[1], 4687 pd->dir == PF_IN ? "in" : "out", 4688 pd->dir == (*state)->direction ? "fwd" : "rev"); 4689 } 4690 4691 if (dst->scrub || src->scrub) { 4692 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4693 *state, src, dst, copyback)) 4694 return (PF_DROP); 4695 } 4696 4697 /* update max window */ 4698 if (src->max_win < win) 4699 src->max_win = win; 4700 /* synchronize sequencing */ 4701 if (SEQ_GT(end, src->seqlo)) 4702 src->seqlo = end; 4703 /* slide the window of what the other end can send */ 4704 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4705 dst->seqhi = ack + MAX((win << sws), 1); 4706 4707 /* 4708 * Cannot set dst->seqhi here since this could be a shotgunned 4709 * SYN and not an already established connection. 4710 */ 4711 4712 if (th->th_flags & TH_FIN) 4713 if (src->state < TCPS_CLOSING) 4714 pf_set_protostate(*state, psrc, TCPS_CLOSING); 4715 if (th->th_flags & TH_RST) 4716 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 4717 4718 /* Fall through to PASS packet */ 4719 4720 } else { 4721 if ((*state)->dst.state == TCPS_SYN_SENT && 4722 (*state)->src.state == TCPS_SYN_SENT) { 4723 /* Send RST for state mismatches during handshake */ 4724 if (!(th->th_flags & TH_RST)) 4725 pf_send_tcp((*state)->rule.ptr, pd->af, 4726 pd->dst, pd->src, th->th_dport, 4727 th->th_sport, ntohl(th->th_ack), 0, 4728 TH_RST, 0, 0, 4729 (*state)->rule.ptr->return_ttl, 1, 0); 4730 src->seqlo = 0; 4731 src->seqhi = 1; 4732 src->max_win = 1; 4733 } else if (V_pf_status.debug >= PF_DEBUG_MISC) { 4734 printf("pf: BAD state: "); 4735 pf_print_state(*state); 4736 pf_print_flags(th->th_flags); 4737 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4738 "pkts=%llu:%llu dir=%s,%s\n", 4739 seq, orig_seq, ack, pd->p_len, ackskew, 4740 (unsigned long long)(*state)->packets[0], 4741 (unsigned long long)(*state)->packets[1], 4742 pd->dir == PF_IN ? "in" : "out", 4743 pd->dir == (*state)->direction ? "fwd" : "rev"); 4744 printf("pf: State failure on: %c %c %c %c | %c %c\n", 4745 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 4746 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 4747 ' ': '2', 4748 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 4749 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 4750 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 4751 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 4752 } 4753 REASON_SET(reason, PFRES_BADSTATE); 4754 return (PF_DROP); 4755 } 4756 4757 return (PF_PASS); 4758 } 4759 4760 static int 4761 pf_tcp_track_sloppy(struct pf_kstate **state, struct pf_pdesc *pd, u_short *reason) 4762 { 4763 struct tcphdr *th = &pd->hdr.tcp; 4764 struct pf_state_peer *src, *dst; 4765 u_int8_t psrc, pdst; 4766 4767 if (pd->dir == (*state)->direction) { 4768 src = &(*state)->src; 4769 dst = &(*state)->dst; 4770 psrc = PF_PEER_SRC; 4771 pdst = PF_PEER_DST; 4772 } else { 4773 src = &(*state)->dst; 4774 dst = &(*state)->src; 4775 psrc = PF_PEER_DST; 4776 pdst = PF_PEER_SRC; 4777 } 4778 4779 if (th->th_flags & TH_SYN) 4780 if (src->state < TCPS_SYN_SENT) 4781 pf_set_protostate(*state, psrc, TCPS_SYN_SENT); 4782 if (th->th_flags & TH_FIN) 4783 if (src->state < TCPS_CLOSING) 4784 pf_set_protostate(*state, psrc, TCPS_CLOSING); 4785 if (th->th_flags & TH_ACK) { 4786 if (dst->state == TCPS_SYN_SENT) { 4787 pf_set_protostate(*state, pdst, TCPS_ESTABLISHED); 4788 if (src->state == TCPS_ESTABLISHED && 4789 (*state)->src_node != NULL && 4790 pf_src_connlimit(state)) { 4791 REASON_SET(reason, PFRES_SRCLIMIT); 4792 return (PF_DROP); 4793 } 4794 } else if (dst->state == TCPS_CLOSING) { 4795 pf_set_protostate(*state, pdst, TCPS_FIN_WAIT_2); 4796 } else if (src->state == TCPS_SYN_SENT && 4797 dst->state < TCPS_SYN_SENT) { 4798 /* 4799 * Handle a special sloppy case where we only see one 4800 * half of the connection. If there is a ACK after 4801 * the initial SYN without ever seeing a packet from 4802 * the destination, set the connection to established. 4803 */ 4804 pf_set_protostate(*state, PF_PEER_BOTH, 4805 TCPS_ESTABLISHED); 4806 dst->state = src->state = TCPS_ESTABLISHED; 4807 if ((*state)->src_node != NULL && 4808 pf_src_connlimit(state)) { 4809 REASON_SET(reason, PFRES_SRCLIMIT); 4810 return (PF_DROP); 4811 } 4812 } else if (src->state == TCPS_CLOSING && 4813 dst->state == TCPS_ESTABLISHED && 4814 dst->seqlo == 0) { 4815 /* 4816 * Handle the closing of half connections where we 4817 * don't see the full bidirectional FIN/ACK+ACK 4818 * handshake. 4819 */ 4820 pf_set_protostate(*state, pdst, TCPS_CLOSING); 4821 } 4822 } 4823 if (th->th_flags & TH_RST) 4824 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT); 4825 4826 /* update expire time */ 4827 (*state)->expire = time_uptime; 4828 if (src->state >= TCPS_FIN_WAIT_2 && 4829 dst->state >= TCPS_FIN_WAIT_2) 4830 (*state)->timeout = PFTM_TCP_CLOSED; 4831 else if (src->state >= TCPS_CLOSING && 4832 dst->state >= TCPS_CLOSING) 4833 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4834 else if (src->state < TCPS_ESTABLISHED || 4835 dst->state < TCPS_ESTABLISHED) 4836 (*state)->timeout = PFTM_TCP_OPENING; 4837 else if (src->state >= TCPS_CLOSING || 4838 dst->state >= TCPS_CLOSING) 4839 (*state)->timeout = PFTM_TCP_CLOSING; 4840 else 4841 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4842 4843 return (PF_PASS); 4844 } 4845 4846 static int 4847 pf_synproxy(struct pf_pdesc *pd, struct pf_kstate **state, u_short *reason) 4848 { 4849 struct pf_state_key *sk = (*state)->key[pd->didx]; 4850 struct tcphdr *th = &pd->hdr.tcp; 4851 4852 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 4853 if (pd->dir != (*state)->direction) { 4854 REASON_SET(reason, PFRES_SYNPROXY); 4855 return (PF_SYNPROXY_DROP); 4856 } 4857 if (th->th_flags & TH_SYN) { 4858 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 4859 REASON_SET(reason, PFRES_SYNPROXY); 4860 return (PF_DROP); 4861 } 4862 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4863 pd->src, th->th_dport, th->th_sport, 4864 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 4865 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0); 4866 REASON_SET(reason, PFRES_SYNPROXY); 4867 return (PF_SYNPROXY_DROP); 4868 } else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK || 4869 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4870 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4871 REASON_SET(reason, PFRES_SYNPROXY); 4872 return (PF_DROP); 4873 } else if ((*state)->src_node != NULL && 4874 pf_src_connlimit(state)) { 4875 REASON_SET(reason, PFRES_SRCLIMIT); 4876 return (PF_DROP); 4877 } else 4878 pf_set_protostate(*state, PF_PEER_SRC, 4879 PF_TCPS_PROXY_DST); 4880 } 4881 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 4882 if (pd->dir == (*state)->direction) { 4883 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 4884 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 4885 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 4886 REASON_SET(reason, PFRES_SYNPROXY); 4887 return (PF_DROP); 4888 } 4889 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 4890 if ((*state)->dst.seqhi == 1) 4891 (*state)->dst.seqhi = htonl(arc4random()); 4892 pf_send_tcp((*state)->rule.ptr, pd->af, 4893 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4894 sk->port[pd->sidx], sk->port[pd->didx], 4895 (*state)->dst.seqhi, 0, TH_SYN, 0, 4896 (*state)->src.mss, 0, 0, (*state)->tag); 4897 REASON_SET(reason, PFRES_SYNPROXY); 4898 return (PF_SYNPROXY_DROP); 4899 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 4900 (TH_SYN|TH_ACK)) || 4901 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 4902 REASON_SET(reason, PFRES_SYNPROXY); 4903 return (PF_DROP); 4904 } else { 4905 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 4906 (*state)->dst.seqlo = ntohl(th->th_seq); 4907 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 4908 pd->src, th->th_dport, th->th_sport, 4909 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 4910 TH_ACK, (*state)->src.max_win, 0, 0, 0, 4911 (*state)->tag); 4912 pf_send_tcp((*state)->rule.ptr, pd->af, 4913 &sk->addr[pd->sidx], &sk->addr[pd->didx], 4914 sk->port[pd->sidx], sk->port[pd->didx], 4915 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 4916 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0); 4917 (*state)->src.seqdiff = (*state)->dst.seqhi - 4918 (*state)->src.seqlo; 4919 (*state)->dst.seqdiff = (*state)->src.seqhi - 4920 (*state)->dst.seqlo; 4921 (*state)->src.seqhi = (*state)->src.seqlo + 4922 (*state)->dst.max_win; 4923 (*state)->dst.seqhi = (*state)->dst.seqlo + 4924 (*state)->src.max_win; 4925 (*state)->src.wscale = (*state)->dst.wscale = 0; 4926 pf_set_protostate(*state, PF_PEER_BOTH, 4927 TCPS_ESTABLISHED); 4928 REASON_SET(reason, PFRES_SYNPROXY); 4929 return (PF_SYNPROXY_DROP); 4930 } 4931 } 4932 4933 return (PF_PASS); 4934 } 4935 4936 static int 4937 pf_test_state_tcp(struct pf_kstate **state, int direction, struct pfi_kkif *kif, 4938 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4939 u_short *reason) 4940 { 4941 struct pf_state_key_cmp key; 4942 struct tcphdr *th = &pd->hdr.tcp; 4943 int copyback = 0; 4944 int action; 4945 struct pf_state_peer *src, *dst; 4946 struct pf_state_key *sk; 4947 4948 bzero(&key, sizeof(key)); 4949 key.af = pd->af; 4950 key.proto = IPPROTO_TCP; 4951 if (direction == PF_IN) { /* wire side, straight */ 4952 PF_ACPY(&key.addr[0], pd->src, key.af); 4953 PF_ACPY(&key.addr[1], pd->dst, key.af); 4954 key.port[0] = th->th_sport; 4955 key.port[1] = th->th_dport; 4956 } else { /* stack side, reverse */ 4957 PF_ACPY(&key.addr[1], pd->src, key.af); 4958 PF_ACPY(&key.addr[0], pd->dst, key.af); 4959 key.port[1] = th->th_sport; 4960 key.port[0] = th->th_dport; 4961 } 4962 4963 STATE_LOOKUP(kif, &key, direction, *state, pd); 4964 4965 if (direction == (*state)->direction) { 4966 src = &(*state)->src; 4967 dst = &(*state)->dst; 4968 } else { 4969 src = &(*state)->dst; 4970 dst = &(*state)->src; 4971 } 4972 4973 sk = (*state)->key[pd->didx]; 4974 4975 if ((action = pf_synproxy(pd, state, reason)) != PF_PASS) 4976 return (action); 4977 4978 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 4979 dst->state >= TCPS_FIN_WAIT_2 && 4980 src->state >= TCPS_FIN_WAIT_2) { 4981 if (V_pf_status.debug >= PF_DEBUG_MISC) { 4982 printf("pf: state reuse "); 4983 pf_print_state(*state); 4984 pf_print_flags(th->th_flags); 4985 printf("\n"); 4986 } 4987 /* XXX make sure it's the same direction ?? */ 4988 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED); 4989 pf_unlink_state(*state, PF_ENTER_LOCKED); 4990 *state = NULL; 4991 return (PF_DROP); 4992 } 4993 4994 if ((*state)->state_flags & PFSTATE_SLOPPY) { 4995 if (pf_tcp_track_sloppy(state, pd, reason) == PF_DROP) 4996 return (PF_DROP); 4997 } else { 4998 if (pf_tcp_track_full(state, kif, m, off, pd, reason, 4999 ©back) == PF_DROP) 5000 return (PF_DROP); 5001 } 5002 5003 /* translate source/destination address, if necessary */ 5004 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5005 struct pf_state_key *nk = (*state)->key[pd->didx]; 5006 5007 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5008 nk->port[pd->sidx] != th->th_sport) 5009 pf_change_ap(m, pd->src, &th->th_sport, 5010 pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], 5011 nk->port[pd->sidx], 0, pd->af); 5012 5013 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5014 nk->port[pd->didx] != th->th_dport) 5015 pf_change_ap(m, pd->dst, &th->th_dport, 5016 pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], 5017 nk->port[pd->didx], 0, pd->af); 5018 copyback = 1; 5019 } 5020 5021 /* Copyback sequence modulation or stateful scrub changes if needed */ 5022 if (copyback) 5023 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5024 5025 return (PF_PASS); 5026 } 5027 5028 static int 5029 pf_test_state_udp(struct pf_kstate **state, int direction, struct pfi_kkif *kif, 5030 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5031 { 5032 struct pf_state_peer *src, *dst; 5033 struct pf_state_key_cmp key; 5034 struct udphdr *uh = &pd->hdr.udp; 5035 uint8_t psrc, pdst; 5036 5037 bzero(&key, sizeof(key)); 5038 key.af = pd->af; 5039 key.proto = IPPROTO_UDP; 5040 if (direction == PF_IN) { /* wire side, straight */ 5041 PF_ACPY(&key.addr[0], pd->src, key.af); 5042 PF_ACPY(&key.addr[1], pd->dst, key.af); 5043 key.port[0] = uh->uh_sport; 5044 key.port[1] = uh->uh_dport; 5045 } else { /* stack side, reverse */ 5046 PF_ACPY(&key.addr[1], pd->src, key.af); 5047 PF_ACPY(&key.addr[0], pd->dst, key.af); 5048 key.port[1] = uh->uh_sport; 5049 key.port[0] = uh->uh_dport; 5050 } 5051 5052 STATE_LOOKUP(kif, &key, direction, *state, pd); 5053 5054 if (direction == (*state)->direction) { 5055 src = &(*state)->src; 5056 dst = &(*state)->dst; 5057 psrc = PF_PEER_SRC; 5058 pdst = PF_PEER_DST; 5059 } else { 5060 src = &(*state)->dst; 5061 dst = &(*state)->src; 5062 psrc = PF_PEER_DST; 5063 pdst = PF_PEER_SRC; 5064 } 5065 5066 /* update states */ 5067 if (src->state < PFUDPS_SINGLE) 5068 pf_set_protostate(*state, psrc, PFUDPS_SINGLE); 5069 if (dst->state == PFUDPS_SINGLE) 5070 pf_set_protostate(*state, pdst, PFUDPS_MULTIPLE); 5071 5072 /* update expire time */ 5073 (*state)->expire = time_uptime; 5074 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5075 (*state)->timeout = PFTM_UDP_MULTIPLE; 5076 else 5077 (*state)->timeout = PFTM_UDP_SINGLE; 5078 5079 /* translate source/destination address, if necessary */ 5080 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5081 struct pf_state_key *nk = (*state)->key[pd->didx]; 5082 5083 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || 5084 nk->port[pd->sidx] != uh->uh_sport) 5085 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum, 5086 &uh->uh_sum, &nk->addr[pd->sidx], 5087 nk->port[pd->sidx], 1, pd->af); 5088 5089 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || 5090 nk->port[pd->didx] != uh->uh_dport) 5091 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum, 5092 &uh->uh_sum, &nk->addr[pd->didx], 5093 nk->port[pd->didx], 1, pd->af); 5094 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5095 } 5096 5097 return (PF_PASS); 5098 } 5099 5100 static int 5101 pf_test_state_icmp(struct pf_kstate **state, int direction, struct pfi_kkif *kif, 5102 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5103 { 5104 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 5105 u_int16_t icmpid = 0, *icmpsum; 5106 u_int8_t icmptype, icmpcode; 5107 int state_icmp = 0; 5108 struct pf_state_key_cmp key; 5109 5110 bzero(&key, sizeof(key)); 5111 switch (pd->proto) { 5112 #ifdef INET 5113 case IPPROTO_ICMP: 5114 icmptype = pd->hdr.icmp.icmp_type; 5115 icmpcode = pd->hdr.icmp.icmp_code; 5116 icmpid = pd->hdr.icmp.icmp_id; 5117 icmpsum = &pd->hdr.icmp.icmp_cksum; 5118 5119 if (icmptype == ICMP_UNREACH || 5120 icmptype == ICMP_SOURCEQUENCH || 5121 icmptype == ICMP_REDIRECT || 5122 icmptype == ICMP_TIMXCEED || 5123 icmptype == ICMP_PARAMPROB) 5124 state_icmp++; 5125 break; 5126 #endif /* INET */ 5127 #ifdef INET6 5128 case IPPROTO_ICMPV6: 5129 icmptype = pd->hdr.icmp6.icmp6_type; 5130 icmpcode = pd->hdr.icmp6.icmp6_code; 5131 icmpid = pd->hdr.icmp6.icmp6_id; 5132 icmpsum = &pd->hdr.icmp6.icmp6_cksum; 5133 5134 if (icmptype == ICMP6_DST_UNREACH || 5135 icmptype == ICMP6_PACKET_TOO_BIG || 5136 icmptype == ICMP6_TIME_EXCEEDED || 5137 icmptype == ICMP6_PARAM_PROB) 5138 state_icmp++; 5139 break; 5140 #endif /* INET6 */ 5141 } 5142 5143 if (!state_icmp) { 5144 /* 5145 * ICMP query/reply message not related to a TCP/UDP packet. 5146 * Search for an ICMP state. 5147 */ 5148 key.af = pd->af; 5149 key.proto = pd->proto; 5150 key.port[0] = key.port[1] = icmpid; 5151 if (direction == PF_IN) { /* wire side, straight */ 5152 PF_ACPY(&key.addr[0], pd->src, key.af); 5153 PF_ACPY(&key.addr[1], pd->dst, key.af); 5154 } else { /* stack side, reverse */ 5155 PF_ACPY(&key.addr[1], pd->src, key.af); 5156 PF_ACPY(&key.addr[0], pd->dst, key.af); 5157 } 5158 5159 STATE_LOOKUP(kif, &key, direction, *state, pd); 5160 5161 (*state)->expire = time_uptime; 5162 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 5163 5164 /* translate source/destination address, if necessary */ 5165 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5166 struct pf_state_key *nk = (*state)->key[pd->didx]; 5167 5168 switch (pd->af) { 5169 #ifdef INET 5170 case AF_INET: 5171 if (PF_ANEQ(pd->src, 5172 &nk->addr[pd->sidx], AF_INET)) 5173 pf_change_a(&saddr->v4.s_addr, 5174 pd->ip_sum, 5175 nk->addr[pd->sidx].v4.s_addr, 0); 5176 5177 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], 5178 AF_INET)) 5179 pf_change_a(&daddr->v4.s_addr, 5180 pd->ip_sum, 5181 nk->addr[pd->didx].v4.s_addr, 0); 5182 5183 if (nk->port[0] != 5184 pd->hdr.icmp.icmp_id) { 5185 pd->hdr.icmp.icmp_cksum = 5186 pf_cksum_fixup( 5187 pd->hdr.icmp.icmp_cksum, icmpid, 5188 nk->port[pd->sidx], 0); 5189 pd->hdr.icmp.icmp_id = 5190 nk->port[pd->sidx]; 5191 } 5192 5193 m_copyback(m, off, ICMP_MINLEN, 5194 (caddr_t )&pd->hdr.icmp); 5195 break; 5196 #endif /* INET */ 5197 #ifdef INET6 5198 case AF_INET6: 5199 if (PF_ANEQ(pd->src, 5200 &nk->addr[pd->sidx], AF_INET6)) 5201 pf_change_a6(saddr, 5202 &pd->hdr.icmp6.icmp6_cksum, 5203 &nk->addr[pd->sidx], 0); 5204 5205 if (PF_ANEQ(pd->dst, 5206 &nk->addr[pd->didx], AF_INET6)) 5207 pf_change_a6(daddr, 5208 &pd->hdr.icmp6.icmp6_cksum, 5209 &nk->addr[pd->didx], 0); 5210 5211 m_copyback(m, off, sizeof(struct icmp6_hdr), 5212 (caddr_t )&pd->hdr.icmp6); 5213 break; 5214 #endif /* INET6 */ 5215 } 5216 } 5217 return (PF_PASS); 5218 5219 } else { 5220 /* 5221 * ICMP error message in response to a TCP/UDP packet. 5222 * Extract the inner TCP/UDP header and search for that state. 5223 */ 5224 5225 struct pf_pdesc pd2; 5226 bzero(&pd2, sizeof pd2); 5227 #ifdef INET 5228 struct ip h2; 5229 #endif /* INET */ 5230 #ifdef INET6 5231 struct ip6_hdr h2_6; 5232 int terminal = 0; 5233 #endif /* INET6 */ 5234 int ipoff2 = 0; 5235 int off2 = 0; 5236 5237 pd2.af = pd->af; 5238 /* Payload packet is from the opposite direction. */ 5239 pd2.sidx = (direction == PF_IN) ? 1 : 0; 5240 pd2.didx = (direction == PF_IN) ? 0 : 1; 5241 switch (pd->af) { 5242 #ifdef INET 5243 case AF_INET: 5244 /* offset of h2 in mbuf chain */ 5245 ipoff2 = off + ICMP_MINLEN; 5246 5247 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5248 NULL, reason, pd2.af)) { 5249 DPFPRINTF(PF_DEBUG_MISC, 5250 ("pf: ICMP error message too short " 5251 "(ip)\n")); 5252 return (PF_DROP); 5253 } 5254 /* 5255 * ICMP error messages don't refer to non-first 5256 * fragments 5257 */ 5258 if (h2.ip_off & htons(IP_OFFMASK)) { 5259 REASON_SET(reason, PFRES_FRAG); 5260 return (PF_DROP); 5261 } 5262 5263 /* offset of protocol header that follows h2 */ 5264 off2 = ipoff2 + (h2.ip_hl << 2); 5265 5266 pd2.proto = h2.ip_p; 5267 pd2.src = (struct pf_addr *)&h2.ip_src; 5268 pd2.dst = (struct pf_addr *)&h2.ip_dst; 5269 pd2.ip_sum = &h2.ip_sum; 5270 break; 5271 #endif /* INET */ 5272 #ifdef INET6 5273 case AF_INET6: 5274 ipoff2 = off + sizeof(struct icmp6_hdr); 5275 5276 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5277 NULL, reason, pd2.af)) { 5278 DPFPRINTF(PF_DEBUG_MISC, 5279 ("pf: ICMP error message too short " 5280 "(ip6)\n")); 5281 return (PF_DROP); 5282 } 5283 pd2.proto = h2_6.ip6_nxt; 5284 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5285 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5286 pd2.ip_sum = NULL; 5287 off2 = ipoff2 + sizeof(h2_6); 5288 do { 5289 switch (pd2.proto) { 5290 case IPPROTO_FRAGMENT: 5291 /* 5292 * ICMPv6 error messages for 5293 * non-first fragments 5294 */ 5295 REASON_SET(reason, PFRES_FRAG); 5296 return (PF_DROP); 5297 case IPPROTO_AH: 5298 case IPPROTO_HOPOPTS: 5299 case IPPROTO_ROUTING: 5300 case IPPROTO_DSTOPTS: { 5301 /* get next header and header length */ 5302 struct ip6_ext opt6; 5303 5304 if (!pf_pull_hdr(m, off2, &opt6, 5305 sizeof(opt6), NULL, reason, 5306 pd2.af)) { 5307 DPFPRINTF(PF_DEBUG_MISC, 5308 ("pf: ICMPv6 short opt\n")); 5309 return (PF_DROP); 5310 } 5311 if (pd2.proto == IPPROTO_AH) 5312 off2 += (opt6.ip6e_len + 2) * 4; 5313 else 5314 off2 += (opt6.ip6e_len + 1) * 8; 5315 pd2.proto = opt6.ip6e_nxt; 5316 /* goto the next header */ 5317 break; 5318 } 5319 default: 5320 terminal++; 5321 break; 5322 } 5323 } while (!terminal); 5324 break; 5325 #endif /* INET6 */ 5326 } 5327 5328 if (PF_ANEQ(pd->dst, pd2.src, pd->af)) { 5329 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5330 printf("pf: BAD ICMP %d:%d outer dst: ", 5331 icmptype, icmpcode); 5332 pf_print_host(pd->src, 0, pd->af); 5333 printf(" -> "); 5334 pf_print_host(pd->dst, 0, pd->af); 5335 printf(" inner src: "); 5336 pf_print_host(pd2.src, 0, pd2.af); 5337 printf(" -> "); 5338 pf_print_host(pd2.dst, 0, pd2.af); 5339 printf("\n"); 5340 } 5341 REASON_SET(reason, PFRES_BADSTATE); 5342 return (PF_DROP); 5343 } 5344 5345 switch (pd2.proto) { 5346 case IPPROTO_TCP: { 5347 struct tcphdr th; 5348 u_int32_t seq; 5349 struct pf_state_peer *src, *dst; 5350 u_int8_t dws; 5351 int copyback = 0; 5352 5353 /* 5354 * Only the first 8 bytes of the TCP header can be 5355 * expected. Don't access any TCP header fields after 5356 * th_seq, an ackskew test is not possible. 5357 */ 5358 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5359 pd2.af)) { 5360 DPFPRINTF(PF_DEBUG_MISC, 5361 ("pf: ICMP error message too short " 5362 "(tcp)\n")); 5363 return (PF_DROP); 5364 } 5365 5366 key.af = pd2.af; 5367 key.proto = IPPROTO_TCP; 5368 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5369 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5370 key.port[pd2.sidx] = th.th_sport; 5371 key.port[pd2.didx] = th.th_dport; 5372 5373 STATE_LOOKUP(kif, &key, direction, *state, pd); 5374 5375 if (direction == (*state)->direction) { 5376 src = &(*state)->dst; 5377 dst = &(*state)->src; 5378 } else { 5379 src = &(*state)->src; 5380 dst = &(*state)->dst; 5381 } 5382 5383 if (src->wscale && dst->wscale) 5384 dws = dst->wscale & PF_WSCALE_MASK; 5385 else 5386 dws = 0; 5387 5388 /* Demodulate sequence number */ 5389 seq = ntohl(th.th_seq) - src->seqdiff; 5390 if (src->seqdiff) { 5391 pf_change_a(&th.th_seq, icmpsum, 5392 htonl(seq), 0); 5393 copyback = 1; 5394 } 5395 5396 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 5397 (!SEQ_GEQ(src->seqhi, seq) || 5398 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 5399 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5400 printf("pf: BAD ICMP %d:%d ", 5401 icmptype, icmpcode); 5402 pf_print_host(pd->src, 0, pd->af); 5403 printf(" -> "); 5404 pf_print_host(pd->dst, 0, pd->af); 5405 printf(" state: "); 5406 pf_print_state(*state); 5407 printf(" seq=%u\n", seq); 5408 } 5409 REASON_SET(reason, PFRES_BADSTATE); 5410 return (PF_DROP); 5411 } else { 5412 if (V_pf_status.debug >= PF_DEBUG_MISC) { 5413 printf("pf: OK ICMP %d:%d ", 5414 icmptype, icmpcode); 5415 pf_print_host(pd->src, 0, pd->af); 5416 printf(" -> "); 5417 pf_print_host(pd->dst, 0, pd->af); 5418 printf(" state: "); 5419 pf_print_state(*state); 5420 printf(" seq=%u\n", seq); 5421 } 5422 } 5423 5424 /* translate source/destination address, if necessary */ 5425 if ((*state)->key[PF_SK_WIRE] != 5426 (*state)->key[PF_SK_STACK]) { 5427 struct pf_state_key *nk = 5428 (*state)->key[pd->didx]; 5429 5430 if (PF_ANEQ(pd2.src, 5431 &nk->addr[pd2.sidx], pd2.af) || 5432 nk->port[pd2.sidx] != th.th_sport) 5433 pf_change_icmp(pd2.src, &th.th_sport, 5434 daddr, &nk->addr[pd2.sidx], 5435 nk->port[pd2.sidx], NULL, 5436 pd2.ip_sum, icmpsum, 5437 pd->ip_sum, 0, pd2.af); 5438 5439 if (PF_ANEQ(pd2.dst, 5440 &nk->addr[pd2.didx], pd2.af) || 5441 nk->port[pd2.didx] != th.th_dport) 5442 pf_change_icmp(pd2.dst, &th.th_dport, 5443 saddr, &nk->addr[pd2.didx], 5444 nk->port[pd2.didx], NULL, 5445 pd2.ip_sum, icmpsum, 5446 pd->ip_sum, 0, pd2.af); 5447 copyback = 1; 5448 } 5449 5450 if (copyback) { 5451 switch (pd2.af) { 5452 #ifdef INET 5453 case AF_INET: 5454 m_copyback(m, off, ICMP_MINLEN, 5455 (caddr_t )&pd->hdr.icmp); 5456 m_copyback(m, ipoff2, sizeof(h2), 5457 (caddr_t )&h2); 5458 break; 5459 #endif /* INET */ 5460 #ifdef INET6 5461 case AF_INET6: 5462 m_copyback(m, off, 5463 sizeof(struct icmp6_hdr), 5464 (caddr_t )&pd->hdr.icmp6); 5465 m_copyback(m, ipoff2, sizeof(h2_6), 5466 (caddr_t )&h2_6); 5467 break; 5468 #endif /* INET6 */ 5469 } 5470 m_copyback(m, off2, 8, (caddr_t)&th); 5471 } 5472 5473 return (PF_PASS); 5474 break; 5475 } 5476 case IPPROTO_UDP: { 5477 struct udphdr uh; 5478 5479 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5480 NULL, reason, pd2.af)) { 5481 DPFPRINTF(PF_DEBUG_MISC, 5482 ("pf: ICMP error message too short " 5483 "(udp)\n")); 5484 return (PF_DROP); 5485 } 5486 5487 key.af = pd2.af; 5488 key.proto = IPPROTO_UDP; 5489 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5490 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5491 key.port[pd2.sidx] = uh.uh_sport; 5492 key.port[pd2.didx] = uh.uh_dport; 5493 5494 STATE_LOOKUP(kif, &key, direction, *state, pd); 5495 5496 /* translate source/destination address, if necessary */ 5497 if ((*state)->key[PF_SK_WIRE] != 5498 (*state)->key[PF_SK_STACK]) { 5499 struct pf_state_key *nk = 5500 (*state)->key[pd->didx]; 5501 5502 if (PF_ANEQ(pd2.src, 5503 &nk->addr[pd2.sidx], pd2.af) || 5504 nk->port[pd2.sidx] != uh.uh_sport) 5505 pf_change_icmp(pd2.src, &uh.uh_sport, 5506 daddr, &nk->addr[pd2.sidx], 5507 nk->port[pd2.sidx], &uh.uh_sum, 5508 pd2.ip_sum, icmpsum, 5509 pd->ip_sum, 1, pd2.af); 5510 5511 if (PF_ANEQ(pd2.dst, 5512 &nk->addr[pd2.didx], pd2.af) || 5513 nk->port[pd2.didx] != uh.uh_dport) 5514 pf_change_icmp(pd2.dst, &uh.uh_dport, 5515 saddr, &nk->addr[pd2.didx], 5516 nk->port[pd2.didx], &uh.uh_sum, 5517 pd2.ip_sum, icmpsum, 5518 pd->ip_sum, 1, pd2.af); 5519 5520 switch (pd2.af) { 5521 #ifdef INET 5522 case AF_INET: 5523 m_copyback(m, off, ICMP_MINLEN, 5524 (caddr_t )&pd->hdr.icmp); 5525 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5526 break; 5527 #endif /* INET */ 5528 #ifdef INET6 5529 case AF_INET6: 5530 m_copyback(m, off, 5531 sizeof(struct icmp6_hdr), 5532 (caddr_t )&pd->hdr.icmp6); 5533 m_copyback(m, ipoff2, sizeof(h2_6), 5534 (caddr_t )&h2_6); 5535 break; 5536 #endif /* INET6 */ 5537 } 5538 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); 5539 } 5540 return (PF_PASS); 5541 break; 5542 } 5543 #ifdef INET 5544 case IPPROTO_ICMP: { 5545 struct icmp iih; 5546 5547 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5548 NULL, reason, pd2.af)) { 5549 DPFPRINTF(PF_DEBUG_MISC, 5550 ("pf: ICMP error message too short i" 5551 "(icmp)\n")); 5552 return (PF_DROP); 5553 } 5554 5555 key.af = pd2.af; 5556 key.proto = IPPROTO_ICMP; 5557 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5558 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5559 key.port[0] = key.port[1] = iih.icmp_id; 5560 5561 STATE_LOOKUP(kif, &key, direction, *state, pd); 5562 5563 /* translate source/destination address, if necessary */ 5564 if ((*state)->key[PF_SK_WIRE] != 5565 (*state)->key[PF_SK_STACK]) { 5566 struct pf_state_key *nk = 5567 (*state)->key[pd->didx]; 5568 5569 if (PF_ANEQ(pd2.src, 5570 &nk->addr[pd2.sidx], pd2.af) || 5571 nk->port[pd2.sidx] != iih.icmp_id) 5572 pf_change_icmp(pd2.src, &iih.icmp_id, 5573 daddr, &nk->addr[pd2.sidx], 5574 nk->port[pd2.sidx], NULL, 5575 pd2.ip_sum, icmpsum, 5576 pd->ip_sum, 0, AF_INET); 5577 5578 if (PF_ANEQ(pd2.dst, 5579 &nk->addr[pd2.didx], pd2.af) || 5580 nk->port[pd2.didx] != iih.icmp_id) 5581 pf_change_icmp(pd2.dst, &iih.icmp_id, 5582 saddr, &nk->addr[pd2.didx], 5583 nk->port[pd2.didx], NULL, 5584 pd2.ip_sum, icmpsum, 5585 pd->ip_sum, 0, AF_INET); 5586 5587 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); 5588 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5589 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); 5590 } 5591 return (PF_PASS); 5592 break; 5593 } 5594 #endif /* INET */ 5595 #ifdef INET6 5596 case IPPROTO_ICMPV6: { 5597 struct icmp6_hdr iih; 5598 5599 if (!pf_pull_hdr(m, off2, &iih, 5600 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5601 DPFPRINTF(PF_DEBUG_MISC, 5602 ("pf: ICMP error message too short " 5603 "(icmp6)\n")); 5604 return (PF_DROP); 5605 } 5606 5607 key.af = pd2.af; 5608 key.proto = IPPROTO_ICMPV6; 5609 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5610 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5611 key.port[0] = key.port[1] = iih.icmp6_id; 5612 5613 STATE_LOOKUP(kif, &key, direction, *state, pd); 5614 5615 /* translate source/destination address, if necessary */ 5616 if ((*state)->key[PF_SK_WIRE] != 5617 (*state)->key[PF_SK_STACK]) { 5618 struct pf_state_key *nk = 5619 (*state)->key[pd->didx]; 5620 5621 if (PF_ANEQ(pd2.src, 5622 &nk->addr[pd2.sidx], pd2.af) || 5623 nk->port[pd2.sidx] != iih.icmp6_id) 5624 pf_change_icmp(pd2.src, &iih.icmp6_id, 5625 daddr, &nk->addr[pd2.sidx], 5626 nk->port[pd2.sidx], NULL, 5627 pd2.ip_sum, icmpsum, 5628 pd->ip_sum, 0, AF_INET6); 5629 5630 if (PF_ANEQ(pd2.dst, 5631 &nk->addr[pd2.didx], pd2.af) || 5632 nk->port[pd2.didx] != iih.icmp6_id) 5633 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5634 saddr, &nk->addr[pd2.didx], 5635 nk->port[pd2.didx], NULL, 5636 pd2.ip_sum, icmpsum, 5637 pd->ip_sum, 0, AF_INET6); 5638 5639 m_copyback(m, off, sizeof(struct icmp6_hdr), 5640 (caddr_t)&pd->hdr.icmp6); 5641 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); 5642 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5643 (caddr_t)&iih); 5644 } 5645 return (PF_PASS); 5646 break; 5647 } 5648 #endif /* INET6 */ 5649 default: { 5650 key.af = pd2.af; 5651 key.proto = pd2.proto; 5652 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); 5653 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); 5654 key.port[0] = key.port[1] = 0; 5655 5656 STATE_LOOKUP(kif, &key, direction, *state, pd); 5657 5658 /* translate source/destination address, if necessary */ 5659 if ((*state)->key[PF_SK_WIRE] != 5660 (*state)->key[PF_SK_STACK]) { 5661 struct pf_state_key *nk = 5662 (*state)->key[pd->didx]; 5663 5664 if (PF_ANEQ(pd2.src, 5665 &nk->addr[pd2.sidx], pd2.af)) 5666 pf_change_icmp(pd2.src, NULL, daddr, 5667 &nk->addr[pd2.sidx], 0, NULL, 5668 pd2.ip_sum, icmpsum, 5669 pd->ip_sum, 0, pd2.af); 5670 5671 if (PF_ANEQ(pd2.dst, 5672 &nk->addr[pd2.didx], pd2.af)) 5673 pf_change_icmp(pd2.dst, NULL, saddr, 5674 &nk->addr[pd2.didx], 0, NULL, 5675 pd2.ip_sum, icmpsum, 5676 pd->ip_sum, 0, pd2.af); 5677 5678 switch (pd2.af) { 5679 #ifdef INET 5680 case AF_INET: 5681 m_copyback(m, off, ICMP_MINLEN, 5682 (caddr_t)&pd->hdr.icmp); 5683 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); 5684 break; 5685 #endif /* INET */ 5686 #ifdef INET6 5687 case AF_INET6: 5688 m_copyback(m, off, 5689 sizeof(struct icmp6_hdr), 5690 (caddr_t )&pd->hdr.icmp6); 5691 m_copyback(m, ipoff2, sizeof(h2_6), 5692 (caddr_t )&h2_6); 5693 break; 5694 #endif /* INET6 */ 5695 } 5696 } 5697 return (PF_PASS); 5698 break; 5699 } 5700 } 5701 } 5702 } 5703 5704 static int 5705 pf_test_state_other(struct pf_kstate **state, int direction, struct pfi_kkif *kif, 5706 struct mbuf *m, struct pf_pdesc *pd) 5707 { 5708 struct pf_state_peer *src, *dst; 5709 struct pf_state_key_cmp key; 5710 uint8_t psrc, pdst; 5711 5712 bzero(&key, sizeof(key)); 5713 key.af = pd->af; 5714 key.proto = pd->proto; 5715 if (direction == PF_IN) { 5716 PF_ACPY(&key.addr[0], pd->src, key.af); 5717 PF_ACPY(&key.addr[1], pd->dst, key.af); 5718 key.port[0] = key.port[1] = 0; 5719 } else { 5720 PF_ACPY(&key.addr[1], pd->src, key.af); 5721 PF_ACPY(&key.addr[0], pd->dst, key.af); 5722 key.port[1] = key.port[0] = 0; 5723 } 5724 5725 STATE_LOOKUP(kif, &key, direction, *state, pd); 5726 5727 if (direction == (*state)->direction) { 5728 src = &(*state)->src; 5729 dst = &(*state)->dst; 5730 psrc = PF_PEER_SRC; 5731 pdst = PF_PEER_DST; 5732 } else { 5733 src = &(*state)->dst; 5734 dst = &(*state)->src; 5735 psrc = PF_PEER_DST; 5736 pdst = PF_PEER_SRC; 5737 } 5738 5739 /* update states */ 5740 if (src->state < PFOTHERS_SINGLE) 5741 pf_set_protostate(*state, psrc, PFOTHERS_SINGLE); 5742 if (dst->state == PFOTHERS_SINGLE) 5743 pf_set_protostate(*state, pdst, PFOTHERS_MULTIPLE); 5744 5745 /* update expire time */ 5746 (*state)->expire = time_uptime; 5747 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5748 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5749 else 5750 (*state)->timeout = PFTM_OTHER_SINGLE; 5751 5752 /* translate source/destination address, if necessary */ 5753 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { 5754 struct pf_state_key *nk = (*state)->key[pd->didx]; 5755 5756 KASSERT(nk, ("%s: nk is null", __func__)); 5757 KASSERT(pd, ("%s: pd is null", __func__)); 5758 KASSERT(pd->src, ("%s: pd->src is null", __func__)); 5759 KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); 5760 switch (pd->af) { 5761 #ifdef INET 5762 case AF_INET: 5763 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5764 pf_change_a(&pd->src->v4.s_addr, 5765 pd->ip_sum, 5766 nk->addr[pd->sidx].v4.s_addr, 5767 0); 5768 5769 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5770 pf_change_a(&pd->dst->v4.s_addr, 5771 pd->ip_sum, 5772 nk->addr[pd->didx].v4.s_addr, 5773 0); 5774 5775 break; 5776 #endif /* INET */ 5777 #ifdef INET6 5778 case AF_INET6: 5779 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) 5780 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); 5781 5782 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) 5783 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); 5784 #endif /* INET6 */ 5785 } 5786 } 5787 return (PF_PASS); 5788 } 5789 5790 /* 5791 * ipoff and off are measured from the start of the mbuf chain. 5792 * h must be at "ipoff" on the mbuf chain. 5793 */ 5794 void * 5795 pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 5796 u_short *actionp, u_short *reasonp, sa_family_t af) 5797 { 5798 switch (af) { 5799 #ifdef INET 5800 case AF_INET: { 5801 struct ip *h = mtod(m, struct ip *); 5802 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 5803 5804 if (fragoff) { 5805 if (fragoff >= len) 5806 ACTION_SET(actionp, PF_PASS); 5807 else { 5808 ACTION_SET(actionp, PF_DROP); 5809 REASON_SET(reasonp, PFRES_FRAG); 5810 } 5811 return (NULL); 5812 } 5813 if (m->m_pkthdr.len < off + len || 5814 ntohs(h->ip_len) < off + len) { 5815 ACTION_SET(actionp, PF_DROP); 5816 REASON_SET(reasonp, PFRES_SHORT); 5817 return (NULL); 5818 } 5819 break; 5820 } 5821 #endif /* INET */ 5822 #ifdef INET6 5823 case AF_INET6: { 5824 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 5825 5826 if (m->m_pkthdr.len < off + len || 5827 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 5828 (unsigned)(off + len)) { 5829 ACTION_SET(actionp, PF_DROP); 5830 REASON_SET(reasonp, PFRES_SHORT); 5831 return (NULL); 5832 } 5833 break; 5834 } 5835 #endif /* INET6 */ 5836 } 5837 m_copydata(m, off, len, p); 5838 return (p); 5839 } 5840 5841 int 5842 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kkif *kif, 5843 int rtableid) 5844 { 5845 struct ifnet *ifp; 5846 5847 /* 5848 * Skip check for addresses with embedded interface scope, 5849 * as they would always match anyway. 5850 */ 5851 if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6)) 5852 return (1); 5853 5854 if (af != AF_INET && af != AF_INET6) 5855 return (0); 5856 5857 /* Skip checks for ipsec interfaces */ 5858 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 5859 return (1); 5860 5861 ifp = (kif != NULL) ? kif->pfik_ifp : NULL; 5862 5863 switch (af) { 5864 #ifdef INET6 5865 case AF_INET6: 5866 return (fib6_check_urpf(rtableid, &addr->v6, 0, NHR_NONE, 5867 ifp)); 5868 #endif 5869 #ifdef INET 5870 case AF_INET: 5871 return (fib4_check_urpf(rtableid, addr->v4, 0, NHR_NONE, 5872 ifp)); 5873 #endif 5874 } 5875 5876 return (0); 5877 } 5878 5879 #ifdef INET 5880 static void 5881 pf_route(struct mbuf **m, struct pf_krule *r, int dir, struct ifnet *oifp, 5882 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) 5883 { 5884 struct mbuf *m0, *m1; 5885 struct sockaddr_in dst; 5886 struct ip *ip; 5887 struct ifnet *ifp = NULL; 5888 struct pf_addr naddr; 5889 struct pf_ksrc_node *sn = NULL; 5890 int error = 0; 5891 uint16_t ip_len, ip_off; 5892 5893 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 5894 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 5895 __func__)); 5896 5897 if ((pd->pf_mtag == NULL && 5898 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 5899 pd->pf_mtag->routed++ > 3) { 5900 m0 = *m; 5901 *m = NULL; 5902 goto bad_locked; 5903 } 5904 5905 if (r->rt == PF_DUPTO) { 5906 if ((pd->pf_mtag->flags & PF_DUPLICATED)) { 5907 if (s == NULL) { 5908 ifp = r->rpool.cur->kif ? 5909 r->rpool.cur->kif->pfik_ifp : NULL; 5910 } else { 5911 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5912 PF_STATE_UNLOCK(s); 5913 } 5914 if (ifp == oifp) { 5915 /* When the 2nd interface is not skipped */ 5916 return; 5917 } else { 5918 m0 = *m; 5919 *m = NULL; 5920 goto bad; 5921 } 5922 } else { 5923 pd->pf_mtag->flags |= PF_DUPLICATED; 5924 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { 5925 if (s) 5926 PF_STATE_UNLOCK(s); 5927 return; 5928 } 5929 } 5930 } else { 5931 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 5932 if (s) 5933 PF_STATE_UNLOCK(s); 5934 return; 5935 } 5936 m0 = *m; 5937 } 5938 5939 ip = mtod(m0, struct ip *); 5940 5941 bzero(&dst, sizeof(dst)); 5942 dst.sin_family = AF_INET; 5943 dst.sin_len = sizeof(dst); 5944 dst.sin_addr = ip->ip_dst; 5945 5946 bzero(&naddr, sizeof(naddr)); 5947 5948 if (s == NULL) { 5949 if (TAILQ_EMPTY(&r->rpool.list)) { 5950 DPFPRINTF(PF_DEBUG_URGENT, 5951 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 5952 goto bad_locked; 5953 } 5954 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 5955 &naddr, NULL, &sn); 5956 if (!PF_AZERO(&naddr, AF_INET)) 5957 dst.sin_addr.s_addr = naddr.v4.s_addr; 5958 ifp = r->rpool.cur->kif ? 5959 r->rpool.cur->kif->pfik_ifp : NULL; 5960 } else { 5961 if (!PF_AZERO(&s->rt_addr, AF_INET)) 5962 dst.sin_addr.s_addr = 5963 s->rt_addr.v4.s_addr; 5964 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 5965 PF_STATE_UNLOCK(s); 5966 } 5967 if (ifp == NULL) 5968 goto bad; 5969 5970 if (dir == PF_IN) { 5971 if (pf_test(PF_OUT, 0, ifp, &m0, inp) != PF_PASS) 5972 goto bad; 5973 else if (m0 == NULL) 5974 goto done; 5975 if (m0->m_len < sizeof(struct ip)) { 5976 DPFPRINTF(PF_DEBUG_URGENT, 5977 ("%s: m0->m_len < sizeof(struct ip)\n", __func__)); 5978 goto bad; 5979 } 5980 ip = mtod(m0, struct ip *); 5981 } 5982 5983 if (ifp->if_flags & IFF_LOOPBACK) 5984 m0->m_flags |= M_SKIP_FIREWALL; 5985 5986 ip_len = ntohs(ip->ip_len); 5987 ip_off = ntohs(ip->ip_off); 5988 5989 /* Copied from FreeBSD 10.0-CURRENT ip_output. */ 5990 m0->m_pkthdr.csum_flags |= CSUM_IP; 5991 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 5992 m0 = mb_unmapped_to_ext(m0); 5993 if (m0 == NULL) 5994 goto done; 5995 in_delayed_cksum(m0); 5996 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 5997 } 5998 #if defined(SCTP) || defined(SCTP_SUPPORT) 5999 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 6000 m0 = mb_unmapped_to_ext(m0); 6001 if (m0 == NULL) 6002 goto done; 6003 sctp_delayed_cksum(m0, (uint32_t)(ip->ip_hl << 2)); 6004 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 6005 } 6006 #endif 6007 6008 /* 6009 * If small enough for interface, or the interface will take 6010 * care of the fragmentation for us, we can just send directly. 6011 */ 6012 if (ip_len <= ifp->if_mtu || 6013 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 6014 ip->ip_sum = 0; 6015 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 6016 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6017 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 6018 } 6019 m_clrprotoflags(m0); /* Avoid confusing lower layers. */ 6020 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 6021 goto done; 6022 } 6023 6024 /* Balk when DF bit is set or the interface didn't support TSO. */ 6025 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 6026 error = EMSGSIZE; 6027 KMOD_IPSTAT_INC(ips_cantfrag); 6028 if (r->rt != PF_DUPTO) { 6029 if (s && pd->nat_rule != NULL) 6030 PACKET_UNDO_NAT(m0, pd, 6031 (ip->ip_hl << 2) + (ip_off & IP_OFFMASK), 6032 s, dir); 6033 6034 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6035 ifp->if_mtu); 6036 goto done; 6037 } else 6038 goto bad; 6039 } 6040 6041 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist); 6042 if (error) 6043 goto bad; 6044 6045 for (; m0; m0 = m1) { 6046 m1 = m0->m_nextpkt; 6047 m0->m_nextpkt = NULL; 6048 if (error == 0) { 6049 m_clrprotoflags(m0); 6050 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL); 6051 } else 6052 m_freem(m0); 6053 } 6054 6055 if (error == 0) 6056 KMOD_IPSTAT_INC(ips_fragmented); 6057 6058 done: 6059 if (r->rt != PF_DUPTO) 6060 *m = NULL; 6061 return; 6062 6063 bad_locked: 6064 if (s) 6065 PF_STATE_UNLOCK(s); 6066 bad: 6067 m_freem(m0); 6068 goto done; 6069 } 6070 #endif /* INET */ 6071 6072 #ifdef INET6 6073 static void 6074 pf_route6(struct mbuf **m, struct pf_krule *r, int dir, struct ifnet *oifp, 6075 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp) 6076 { 6077 struct mbuf *m0; 6078 struct sockaddr_in6 dst; 6079 struct ip6_hdr *ip6; 6080 struct ifnet *ifp = NULL; 6081 struct pf_addr naddr; 6082 struct pf_ksrc_node *sn = NULL; 6083 6084 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__)); 6085 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction", 6086 __func__)); 6087 6088 if ((pd->pf_mtag == NULL && 6089 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) || 6090 pd->pf_mtag->routed++ > 3) { 6091 m0 = *m; 6092 *m = NULL; 6093 goto bad_locked; 6094 } 6095 6096 if (r->rt == PF_DUPTO) { 6097 if ((pd->pf_mtag->flags & PF_DUPLICATED)) { 6098 if (s == NULL) { 6099 ifp = r->rpool.cur->kif ? 6100 r->rpool.cur->kif->pfik_ifp : NULL; 6101 } else { 6102 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6103 PF_STATE_UNLOCK(s); 6104 } 6105 if (ifp == oifp) { 6106 /* When the 2nd interface is not skipped */ 6107 return; 6108 } else { 6109 m0 = *m; 6110 *m = NULL; 6111 goto bad; 6112 } 6113 } else { 6114 pd->pf_mtag->flags |= PF_DUPLICATED; 6115 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { 6116 if (s) 6117 PF_STATE_UNLOCK(s); 6118 return; 6119 } 6120 } 6121 } else { 6122 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { 6123 if (s) 6124 PF_STATE_UNLOCK(s); 6125 return; 6126 } 6127 m0 = *m; 6128 } 6129 6130 ip6 = mtod(m0, struct ip6_hdr *); 6131 6132 bzero(&dst, sizeof(dst)); 6133 dst.sin6_family = AF_INET6; 6134 dst.sin6_len = sizeof(dst); 6135 dst.sin6_addr = ip6->ip6_dst; 6136 6137 bzero(&naddr, sizeof(naddr)); 6138 6139 if (s == NULL) { 6140 if (TAILQ_EMPTY(&r->rpool.list)) { 6141 DPFPRINTF(PF_DEBUG_URGENT, 6142 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__)); 6143 goto bad_locked; 6144 } 6145 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6146 &naddr, NULL, &sn); 6147 if (!PF_AZERO(&naddr, AF_INET6)) 6148 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 6149 &naddr, AF_INET6); 6150 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6151 } else { 6152 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6153 PF_ACPY((struct pf_addr *)&dst.sin6_addr, 6154 &s->rt_addr, AF_INET6); 6155 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6156 } 6157 6158 if (s) 6159 PF_STATE_UNLOCK(s); 6160 6161 if (ifp == NULL) 6162 goto bad; 6163 6164 if (dir == PF_IN) { 6165 if (pf_test6(PF_OUT, PFIL_FWD, ifp, &m0, inp) != PF_PASS) 6166 goto bad; 6167 else if (m0 == NULL) 6168 goto done; 6169 if (m0->m_len < sizeof(struct ip6_hdr)) { 6170 DPFPRINTF(PF_DEBUG_URGENT, 6171 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n", 6172 __func__)); 6173 goto bad; 6174 } 6175 ip6 = mtod(m0, struct ip6_hdr *); 6176 } 6177 6178 if (ifp->if_flags & IFF_LOOPBACK) 6179 m0->m_flags |= M_SKIP_FIREWALL; 6180 6181 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 & 6182 ~ifp->if_hwassist) { 6183 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6); 6184 m0 = mb_unmapped_to_ext(m0); 6185 if (m0 == NULL) 6186 goto done; 6187 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr)); 6188 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 6189 } 6190 6191 /* 6192 * If the packet is too large for the outgoing interface, 6193 * send back an icmp6 error. 6194 */ 6195 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr)) 6196 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6197 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) 6198 nd6_output_ifp(ifp, ifp, m0, &dst, NULL); 6199 else { 6200 in6_ifstat_inc(ifp, ifs6_in_toobig); 6201 if (r->rt != PF_DUPTO) { 6202 if (s && pd->nat_rule != NULL) 6203 PACKET_UNDO_NAT(m0, pd, 6204 ((caddr_t)ip6 - m0->m_data) + 6205 sizeof(struct ip6_hdr), s, dir); 6206 6207 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6208 } else 6209 goto bad; 6210 } 6211 6212 done: 6213 if (r->rt != PF_DUPTO) 6214 *m = NULL; 6215 return; 6216 6217 bad_locked: 6218 if (s) 6219 PF_STATE_UNLOCK(s); 6220 bad: 6221 m_freem(m0); 6222 goto done; 6223 } 6224 #endif /* INET6 */ 6225 6226 /* 6227 * FreeBSD supports cksum offloads for the following drivers. 6228 * em(4), fxp(4), lge(4), nge(4), re(4), ti(4), txp(4), xl(4) 6229 * 6230 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6231 * network driver performed cksum including pseudo header, need to verify 6232 * csum_data 6233 * CSUM_DATA_VALID : 6234 * network driver performed cksum, needs to additional pseudo header 6235 * cksum computation with partial csum_data(i.e. lack of H/W support for 6236 * pseudo header, for instance sk(4) and possibly gem(4)) 6237 * 6238 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6239 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6240 * TCP/UDP layer. 6241 * Also, set csum_data to 0xffff to force cksum validation. 6242 */ 6243 static int 6244 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6245 { 6246 u_int16_t sum = 0; 6247 int hw_assist = 0; 6248 struct ip *ip; 6249 6250 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6251 return (1); 6252 if (m->m_pkthdr.len < off + len) 6253 return (1); 6254 6255 switch (p) { 6256 case IPPROTO_TCP: 6257 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6258 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6259 sum = m->m_pkthdr.csum_data; 6260 } else { 6261 ip = mtod(m, struct ip *); 6262 sum = in_pseudo(ip->ip_src.s_addr, 6263 ip->ip_dst.s_addr, htonl((u_short)len + 6264 m->m_pkthdr.csum_data + IPPROTO_TCP)); 6265 } 6266 sum ^= 0xffff; 6267 ++hw_assist; 6268 } 6269 break; 6270 case IPPROTO_UDP: 6271 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6272 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6273 sum = m->m_pkthdr.csum_data; 6274 } else { 6275 ip = mtod(m, struct ip *); 6276 sum = in_pseudo(ip->ip_src.s_addr, 6277 ip->ip_dst.s_addr, htonl((u_short)len + 6278 m->m_pkthdr.csum_data + IPPROTO_UDP)); 6279 } 6280 sum ^= 0xffff; 6281 ++hw_assist; 6282 } 6283 break; 6284 case IPPROTO_ICMP: 6285 #ifdef INET6 6286 case IPPROTO_ICMPV6: 6287 #endif /* INET6 */ 6288 break; 6289 default: 6290 return (1); 6291 } 6292 6293 if (!hw_assist) { 6294 switch (af) { 6295 case AF_INET: 6296 if (p == IPPROTO_ICMP) { 6297 if (m->m_len < off) 6298 return (1); 6299 m->m_data += off; 6300 m->m_len -= off; 6301 sum = in_cksum(m, len); 6302 m->m_data -= off; 6303 m->m_len += off; 6304 } else { 6305 if (m->m_len < sizeof(struct ip)) 6306 return (1); 6307 sum = in4_cksum(m, p, off, len); 6308 } 6309 break; 6310 #ifdef INET6 6311 case AF_INET6: 6312 if (m->m_len < sizeof(struct ip6_hdr)) 6313 return (1); 6314 sum = in6_cksum(m, p, off, len); 6315 break; 6316 #endif /* INET6 */ 6317 default: 6318 return (1); 6319 } 6320 } 6321 if (sum) { 6322 switch (p) { 6323 case IPPROTO_TCP: 6324 { 6325 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 6326 break; 6327 } 6328 case IPPROTO_UDP: 6329 { 6330 KMOD_UDPSTAT_INC(udps_badsum); 6331 break; 6332 } 6333 #ifdef INET 6334 case IPPROTO_ICMP: 6335 { 6336 KMOD_ICMPSTAT_INC(icps_checksum); 6337 break; 6338 } 6339 #endif 6340 #ifdef INET6 6341 case IPPROTO_ICMPV6: 6342 { 6343 KMOD_ICMP6STAT_INC(icp6s_checksum); 6344 break; 6345 } 6346 #endif /* INET6 */ 6347 } 6348 return (1); 6349 } else { 6350 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6351 m->m_pkthdr.csum_flags |= 6352 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6353 m->m_pkthdr.csum_data = 0xffff; 6354 } 6355 } 6356 return (0); 6357 } 6358 6359 static bool 6360 pf_pdesc_to_dnflow(int dir, const struct pf_pdesc *pd, 6361 const struct pf_krule *r, const struct pf_kstate *s, 6362 struct ip_fw_args *dnflow) 6363 { 6364 int dndir = r->direction; 6365 6366 if (s && dndir == PF_INOUT) 6367 dndir = s->direction; 6368 6369 memset(dnflow, 0, sizeof(*dnflow)); 6370 6371 if (pd->dport != NULL) 6372 dnflow->f_id.dst_port = ntohs(*pd->dport); 6373 if (pd->sport != NULL) 6374 dnflow->f_id.src_port = ntohs(*pd->sport); 6375 6376 if (dir == PF_IN) 6377 dnflow->flags |= IPFW_ARGS_IN; 6378 else 6379 dnflow->flags |= IPFW_ARGS_OUT; 6380 6381 if (dir != dndir && pd->act.dnrpipe) { 6382 dnflow->rule.info = pd->act.dnrpipe; 6383 } 6384 else if (dir == dndir) { 6385 dnflow->rule.info = pd->act.dnpipe; 6386 } 6387 else { 6388 return (false); 6389 } 6390 6391 dnflow->rule.info |= IPFW_IS_DUMMYNET; 6392 if (r->free_flags & PFRULE_DN_IS_PIPE) 6393 dnflow->rule.info |= IPFW_IS_PIPE; 6394 6395 dnflow->f_id.proto = pd->proto; 6396 dnflow->f_id.extra = dnflow->rule.info; 6397 switch (pd->af) { 6398 case AF_INET: 6399 dnflow->f_id.addr_type = 4; 6400 dnflow->f_id.src_ip = ntohl(pd->src->v4.s_addr); 6401 dnflow->f_id.dst_ip = ntohl(pd->dst->v4.s_addr); 6402 break; 6403 case AF_INET6: 6404 dnflow->flags |= IPFW_ARGS_IP6; 6405 dnflow->f_id.addr_type = 6; 6406 dnflow->f_id.src_ip6 = pd->src->v6; 6407 dnflow->f_id.dst_ip6 = pd->dst->v6; 6408 break; 6409 default: 6410 panic("Invalid AF"); 6411 break; 6412 } 6413 6414 return (true); 6415 } 6416 6417 #ifdef INET 6418 int 6419 pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6420 { 6421 struct pfi_kkif *kif; 6422 u_short action, reason = 0, log = 0; 6423 struct mbuf *m = *m0; 6424 struct ip *h = NULL; 6425 struct m_tag *ipfwtag; 6426 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6427 struct pf_kstate *s = NULL; 6428 struct pf_kruleset *ruleset = NULL; 6429 struct pf_pdesc pd; 6430 int off, dirndx, pqid = 0; 6431 6432 PF_RULES_RLOCK_TRACKER; 6433 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); 6434 M_ASSERTPKTHDR(m); 6435 6436 if (!V_pf_status.running) 6437 return (PF_PASS); 6438 6439 memset(&pd, 0, sizeof(pd)); 6440 6441 kif = (struct pfi_kkif *)ifp->if_pf_kif; 6442 6443 if (kif == NULL) { 6444 DPFPRINTF(PF_DEBUG_URGENT, 6445 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6446 return (PF_DROP); 6447 } 6448 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6449 return (PF_PASS); 6450 6451 if (m->m_flags & M_SKIP_FIREWALL) 6452 return (PF_PASS); 6453 6454 pd.pf_mtag = pf_find_mtag(m); 6455 6456 PF_RULES_RLOCK(); 6457 6458 if ((__predict_false(ip_divert_ptr != NULL) || ip_dn_io_ptr != NULL) && 6459 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 6460 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 6461 if ((rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) || 6462 (rr->info & IPFW_IS_DUMMYNET)) { 6463 if (pd.pf_mtag == NULL && 6464 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6465 action = PF_DROP; 6466 goto done; 6467 } 6468 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 6469 m_tag_delete(m, ipfwtag); 6470 } 6471 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { 6472 m->m_flags |= M_FASTFWD_OURS; 6473 pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; 6474 } 6475 } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 6476 /* We do IP header normalization and packet reassembly here */ 6477 action = PF_DROP; 6478 goto done; 6479 } 6480 m = *m0; /* pf_normalize messes with m0 */ 6481 h = mtod(m, struct ip *); 6482 6483 off = h->ip_hl << 2; 6484 if (off < (int)sizeof(struct ip)) { 6485 action = PF_DROP; 6486 REASON_SET(&reason, PFRES_SHORT); 6487 log = 1; 6488 goto done; 6489 } 6490 6491 pd.src = (struct pf_addr *)&h->ip_src; 6492 pd.dst = (struct pf_addr *)&h->ip_dst; 6493 pd.sport = pd.dport = NULL; 6494 pd.ip_sum = &h->ip_sum; 6495 pd.proto_sum = NULL; 6496 pd.proto = h->ip_p; 6497 pd.dir = dir; 6498 pd.sidx = (dir == PF_IN) ? 0 : 1; 6499 pd.didx = (dir == PF_IN) ? 1 : 0; 6500 pd.af = AF_INET; 6501 pd.tos = h->ip_tos & ~IPTOS_ECN_MASK; 6502 pd.tot_len = ntohs(h->ip_len); 6503 6504 /* handle fragments that didn't get reassembled by normalization */ 6505 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 6506 action = pf_test_fragment(&r, dir, kif, m, h, 6507 &pd, &a, &ruleset); 6508 goto done; 6509 } 6510 6511 switch (h->ip_p) { 6512 case IPPROTO_TCP: { 6513 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), 6514 &action, &reason, AF_INET)) { 6515 log = action != PF_PASS; 6516 goto done; 6517 } 6518 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); 6519 6520 pd.sport = &pd.hdr.tcp.th_sport; 6521 pd.dport = &pd.hdr.tcp.th_dport; 6522 6523 /* Respond to SYN with a syncookie. */ 6524 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN && 6525 pd.dir == PF_IN && pf_synflood_check(&pd)) { 6526 pf_syncookie_send(m, off, &pd); 6527 action = PF_DROP; 6528 break; 6529 } 6530 6531 if ((pd.hdr.tcp.th_flags & TH_ACK) && pd.p_len == 0) 6532 pqid = 1; 6533 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 6534 if (action == PF_DROP) 6535 goto done; 6536 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 6537 &reason); 6538 if (action == PF_PASS) { 6539 if (V_pfsync_update_state_ptr != NULL) 6540 V_pfsync_update_state_ptr(s); 6541 r = s->rule.ptr; 6542 a = s->anchor.ptr; 6543 log = s->log; 6544 } else if (s == NULL) { 6545 /* Validate remote SYN|ACK, re-create original SYN if 6546 * valid. */ 6547 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == 6548 TH_ACK && pf_syncookie_validate(&pd) && 6549 pd.dir == PF_IN) { 6550 struct mbuf *msyn; 6551 6552 msyn = pf_syncookie_recreate_syn(h->ip_ttl, 6553 off,&pd); 6554 if (msyn == NULL) { 6555 action = PF_DROP; 6556 break; 6557 } 6558 6559 action = pf_test(dir, pflags, ifp, &msyn, inp); 6560 m_freem(msyn); 6561 6562 if (action == PF_PASS) { 6563 action = pf_test_state_tcp(&s, dir, 6564 kif, m, off, h, &pd, &reason); 6565 if (action != PF_PASS || s == NULL) { 6566 action = PF_DROP; 6567 break; 6568 } 6569 6570 s->src.seqhi = ntohl(pd.hdr.tcp.th_ack) 6571 - 1; 6572 s->src.seqlo = ntohl(pd.hdr.tcp.th_seq) 6573 - 1; 6574 pf_set_protostate(s, PF_PEER_SRC, 6575 PF_TCPS_PROXY_DST); 6576 6577 action = pf_synproxy(&pd, &s, &reason); 6578 if (action != PF_PASS) 6579 break; 6580 } 6581 break; 6582 } 6583 else { 6584 action = pf_test_rule(&r, &s, dir, kif, m, off, 6585 &pd, &a, &ruleset, inp); 6586 } 6587 } 6588 break; 6589 } 6590 6591 case IPPROTO_UDP: { 6592 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), 6593 &action, &reason, AF_INET)) { 6594 log = action != PF_PASS; 6595 goto done; 6596 } 6597 pd.sport = &pd.hdr.udp.uh_sport; 6598 pd.dport = &pd.hdr.udp.uh_dport; 6599 if (pd.hdr.udp.uh_dport == 0 || 6600 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || 6601 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { 6602 action = PF_DROP; 6603 REASON_SET(&reason, PFRES_SHORT); 6604 goto done; 6605 } 6606 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 6607 if (action == PF_PASS) { 6608 if (V_pfsync_update_state_ptr != NULL) 6609 V_pfsync_update_state_ptr(s); 6610 r = s->rule.ptr; 6611 a = s->anchor.ptr; 6612 log = s->log; 6613 } else if (s == NULL) 6614 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6615 &a, &ruleset, inp); 6616 break; 6617 } 6618 6619 case IPPROTO_ICMP: { 6620 if (!pf_pull_hdr(m, off, &pd.hdr.icmp, ICMP_MINLEN, 6621 &action, &reason, AF_INET)) { 6622 log = action != PF_PASS; 6623 goto done; 6624 } 6625 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 6626 &reason); 6627 if (action == PF_PASS) { 6628 if (V_pfsync_update_state_ptr != NULL) 6629 V_pfsync_update_state_ptr(s); 6630 r = s->rule.ptr; 6631 a = s->anchor.ptr; 6632 log = s->log; 6633 } else if (s == NULL) 6634 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6635 &a, &ruleset, inp); 6636 break; 6637 } 6638 6639 #ifdef INET6 6640 case IPPROTO_ICMPV6: { 6641 action = PF_DROP; 6642 DPFPRINTF(PF_DEBUG_MISC, 6643 ("pf: dropping IPv4 packet with ICMPv6 payload\n")); 6644 goto done; 6645 } 6646 #endif 6647 6648 default: 6649 action = pf_test_state_other(&s, dir, kif, m, &pd); 6650 if (action == PF_PASS) { 6651 if (V_pfsync_update_state_ptr != NULL) 6652 V_pfsync_update_state_ptr(s); 6653 r = s->rule.ptr; 6654 a = s->anchor.ptr; 6655 log = s->log; 6656 } else if (s == NULL) 6657 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 6658 &a, &ruleset, inp); 6659 break; 6660 } 6661 6662 done: 6663 PF_RULES_RUNLOCK(); 6664 if (action == PF_PASS && h->ip_hl > 5 && 6665 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 6666 action = PF_DROP; 6667 REASON_SET(&reason, PFRES_IPOPTIONS); 6668 log = r->log; 6669 DPFPRINTF(PF_DEBUG_MISC, 6670 ("pf: dropping packet with ip options\n")); 6671 } 6672 6673 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 6674 action = PF_DROP; 6675 REASON_SET(&reason, PFRES_MEMORY); 6676 } 6677 if (r->rtableid >= 0) 6678 M_SETFIB(m, r->rtableid); 6679 6680 if (r->scrub_flags & PFSTATE_SETPRIO) { 6681 if (pd.tos & IPTOS_LOWDELAY) 6682 pqid = 1; 6683 if (vlan_set_pcp(m, r->set_prio[pqid])) { 6684 action = PF_DROP; 6685 REASON_SET(&reason, PFRES_MEMORY); 6686 log = 1; 6687 DPFPRINTF(PF_DEBUG_MISC, 6688 ("pf: failed to allocate 802.1q mtag\n")); 6689 } 6690 } 6691 6692 #ifdef ALTQ 6693 if (s && s->qid) { 6694 pd.act.pqid = s->pqid; 6695 pd.act.qid = s->qid; 6696 } else if (r->qid) { 6697 pd.act.pqid = r->pqid; 6698 pd.act.qid = r->qid; 6699 } 6700 if (action == PF_PASS && pd.act.qid) { 6701 if (pd.pf_mtag == NULL && 6702 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6703 action = PF_DROP; 6704 REASON_SET(&reason, PFRES_MEMORY); 6705 } else { 6706 if (s != NULL) 6707 pd.pf_mtag->qid_hash = pf_state_hash(s); 6708 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 6709 pd.pf_mtag->qid = pd.act.pqid; 6710 else 6711 pd.pf_mtag->qid = pd.act.qid; 6712 /* Add hints for ecn. */ 6713 pd.pf_mtag->hdr = h; 6714 } 6715 } 6716 #endif /* ALTQ */ 6717 6718 if (s && (s->dnpipe || s->dnrpipe)) { 6719 pd.act.dnpipe = s->dnpipe; 6720 pd.act.dnrpipe = s->dnrpipe; 6721 pd.act.flags = s->state_flags; 6722 } else if (r->dnpipe || r->dnrpipe) { 6723 pd.act.dnpipe = r->dnpipe; 6724 pd.act.dnrpipe = r->dnrpipe; 6725 pd.act.flags = r->free_flags; 6726 } 6727 if ((pd.act.dnpipe || pd.act.dnrpipe) && !PACKET_LOOPED(&pd)) { 6728 if (ip_dn_io_ptr == NULL) { 6729 action = PF_DROP; 6730 REASON_SET(&reason, PFRES_MEMORY); 6731 } else { 6732 struct ip_fw_args dnflow; 6733 6734 if (pd.pf_mtag == NULL && 6735 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6736 action = PF_DROP; 6737 REASON_SET(&reason, PFRES_MEMORY); 6738 if (s) 6739 PF_STATE_UNLOCK(s); 6740 return (action); 6741 } 6742 6743 if (pf_pdesc_to_dnflow(dir, &pd, r, s, &dnflow)) { 6744 ip_dn_io_ptr(m0, &dnflow); 6745 6746 if (*m0 == NULL) { 6747 if (s) 6748 PF_STATE_UNLOCK(s); 6749 return (action); 6750 } else { 6751 /* This is dummynet fast io processing */ 6752 m_tag_delete(*m0, m_tag_first(*m0)); 6753 pd.pf_mtag->flags &= ~PF_PACKET_LOOPED; 6754 } 6755 } 6756 } 6757 } 6758 6759 /* 6760 * connections redirected to loopback should not match sockets 6761 * bound specifically to loopback due to security implications, 6762 * see tcp_input() and in_pcblookup_listen(). 6763 */ 6764 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 6765 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 6766 (s->nat_rule.ptr->action == PF_RDR || 6767 s->nat_rule.ptr->action == PF_BINAT) && 6768 IN_LOOPBACK(ntohl(pd.dst->v4.s_addr))) 6769 m->m_flags |= M_SKIP_FIREWALL; 6770 6771 if (__predict_false(ip_divert_ptr != NULL) && action == PF_PASS && 6772 r->divert.port && !PACKET_LOOPED(&pd)) { 6773 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, 6774 sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); 6775 if (ipfwtag != NULL) { 6776 ((struct ipfw_rule_ref *)(ipfwtag+1))->info = 6777 ntohs(r->divert.port); 6778 ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; 6779 6780 if (s) 6781 PF_STATE_UNLOCK(s); 6782 6783 m_tag_prepend(m, ipfwtag); 6784 if (m->m_flags & M_FASTFWD_OURS) { 6785 if (pd.pf_mtag == NULL && 6786 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6787 action = PF_DROP; 6788 REASON_SET(&reason, PFRES_MEMORY); 6789 log = 1; 6790 DPFPRINTF(PF_DEBUG_MISC, 6791 ("pf: failed to allocate tag\n")); 6792 } else { 6793 pd.pf_mtag->flags |= 6794 PF_FASTFWD_OURS_PRESENT; 6795 m->m_flags &= ~M_FASTFWD_OURS; 6796 } 6797 } 6798 ip_divert_ptr(*m0, dir == PF_IN); 6799 *m0 = NULL; 6800 6801 return (action); 6802 } else { 6803 /* XXX: ipfw has the same behaviour! */ 6804 action = PF_DROP; 6805 REASON_SET(&reason, PFRES_MEMORY); 6806 log = 1; 6807 DPFPRINTF(PF_DEBUG_MISC, 6808 ("pf: failed to allocate divert tag\n")); 6809 } 6810 } 6811 6812 if (log) { 6813 struct pf_krule *lr; 6814 6815 if (s != NULL && s->nat_rule.ptr != NULL && 6816 s->nat_rule.ptr->log & PF_LOG_ALL) 6817 lr = s->nat_rule.ptr; 6818 else 6819 lr = r; 6820 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd, 6821 (s == NULL)); 6822 } 6823 6824 pf_counter_u64_critical_enter(); 6825 pf_counter_u64_add_protected(&kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS], 6826 pd.tot_len); 6827 pf_counter_u64_add_protected(&kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS], 6828 1); 6829 6830 if (action == PF_PASS || r->action == PF_DROP) { 6831 dirndx = (dir == PF_OUT); 6832 pf_counter_u64_add_protected(&r->packets[dirndx], 1); 6833 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); 6834 if (a != NULL) { 6835 pf_counter_u64_add_protected(&a->packets[dirndx], 1); 6836 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); 6837 } 6838 if (s != NULL) { 6839 if (s->nat_rule.ptr != NULL) { 6840 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 6841 1); 6842 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], 6843 pd.tot_len); 6844 } 6845 if (s->src_node != NULL) { 6846 counter_u64_add(s->src_node->packets[dirndx], 6847 1); 6848 counter_u64_add(s->src_node->bytes[dirndx], 6849 pd.tot_len); 6850 } 6851 if (s->nat_src_node != NULL) { 6852 counter_u64_add(s->nat_src_node->packets[dirndx], 6853 1); 6854 counter_u64_add(s->nat_src_node->bytes[dirndx], 6855 pd.tot_len); 6856 } 6857 dirndx = (dir == s->direction) ? 0 : 1; 6858 s->packets[dirndx]++; 6859 s->bytes[dirndx] += pd.tot_len; 6860 } 6861 tr = r; 6862 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 6863 if (nr != NULL && r == &V_pf_default_rule) 6864 tr = nr; 6865 if (tr->src.addr.type == PF_ADDR_TABLE) 6866 pfr_update_stats(tr->src.addr.p.tbl, 6867 (s == NULL) ? pd.src : 6868 &s->key[(s->direction == PF_IN)]-> 6869 addr[(s->direction == PF_OUT)], 6870 pd.af, pd.tot_len, dir == PF_OUT, 6871 r->action == PF_PASS, tr->src.neg); 6872 if (tr->dst.addr.type == PF_ADDR_TABLE) 6873 pfr_update_stats(tr->dst.addr.p.tbl, 6874 (s == NULL) ? pd.dst : 6875 &s->key[(s->direction == PF_IN)]-> 6876 addr[(s->direction == PF_IN)], 6877 pd.af, pd.tot_len, dir == PF_OUT, 6878 r->action == PF_PASS, tr->dst.neg); 6879 } 6880 pf_counter_u64_critical_exit(); 6881 6882 switch (action) { 6883 case PF_SYNPROXY_DROP: 6884 m_freem(*m0); 6885 case PF_DEFER: 6886 *m0 = NULL; 6887 action = PF_PASS; 6888 break; 6889 case PF_DROP: 6890 m_freem(*m0); 6891 *m0 = NULL; 6892 break; 6893 default: 6894 /* pf_route() returns unlocked. */ 6895 if (r->rt) { 6896 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd, inp); 6897 return (action); 6898 } 6899 break; 6900 } 6901 6902 SDT_PROBE4(pf, ip, test, done, action, reason, r, s); 6903 6904 if (s) 6905 PF_STATE_UNLOCK(s); 6906 6907 return (action); 6908 } 6909 #endif /* INET */ 6910 6911 #ifdef INET6 6912 int 6913 pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp) 6914 { 6915 struct pfi_kkif *kif; 6916 u_short action, reason = 0, log = 0; 6917 struct mbuf *m = *m0, *n = NULL; 6918 struct m_tag *mtag; 6919 struct m_tag *ipfwtag; 6920 struct ip6_hdr *h = NULL; 6921 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; 6922 struct pf_kstate *s = NULL; 6923 struct pf_kruleset *ruleset = NULL; 6924 struct pf_pdesc pd; 6925 int off, terminal = 0, dirndx, rh_cnt = 0, pqid = 0; 6926 6927 PF_RULES_RLOCK_TRACKER; 6928 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir)); 6929 M_ASSERTPKTHDR(m); 6930 6931 if (!V_pf_status.running) 6932 return (PF_PASS); 6933 6934 memset(&pd, 0, sizeof(pd)); 6935 pd.pf_mtag = pf_find_mtag(m); 6936 6937 if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED) 6938 return (PF_PASS); 6939 6940 kif = (struct pfi_kkif *)ifp->if_pf_kif; 6941 if (kif == NULL) { 6942 DPFPRINTF(PF_DEBUG_URGENT, 6943 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 6944 return (PF_DROP); 6945 } 6946 if (kif->pfik_flags & PFI_IFLAG_SKIP) 6947 return (PF_PASS); 6948 6949 if (m->m_flags & M_SKIP_FIREWALL) 6950 return (PF_PASS); 6951 6952 PF_RULES_RLOCK(); 6953 6954 /* We do IP header normalization and packet reassembly here */ 6955 if (ip_dn_io_ptr != NULL && 6956 ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { 6957 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); 6958 if (rr->info & IPFW_IS_DUMMYNET) { 6959 if (pd.pf_mtag == NULL && 6960 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 6961 action = PF_DROP; 6962 goto done; 6963 } 6964 pd.pf_mtag->flags |= PF_PACKET_LOOPED; 6965 m_tag_delete(m, ipfwtag); 6966 } 6967 } else if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 6968 action = PF_DROP; 6969 goto done; 6970 } 6971 m = *m0; /* pf_normalize messes with m0 */ 6972 h = mtod(m, struct ip6_hdr *); 6973 6974 /* 6975 * we do not support jumbogram. if we keep going, zero ip6_plen 6976 * will do something bad, so drop the packet for now. 6977 */ 6978 if (htons(h->ip6_plen) == 0) { 6979 action = PF_DROP; 6980 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 6981 goto done; 6982 } 6983 6984 pd.src = (struct pf_addr *)&h->ip6_src; 6985 pd.dst = (struct pf_addr *)&h->ip6_dst; 6986 pd.sport = pd.dport = NULL; 6987 pd.ip_sum = NULL; 6988 pd.proto_sum = NULL; 6989 pd.dir = dir; 6990 pd.sidx = (dir == PF_IN) ? 0 : 1; 6991 pd.didx = (dir == PF_IN) ? 1 : 0; 6992 pd.af = AF_INET6; 6993 pd.tos = IPV6_DSCP(h); 6994 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 6995 6996 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 6997 pd.proto = h->ip6_nxt; 6998 do { 6999 switch (pd.proto) { 7000 case IPPROTO_FRAGMENT: 7001 action = pf_test_fragment(&r, dir, kif, m, h, 7002 &pd, &a, &ruleset); 7003 if (action == PF_DROP) 7004 REASON_SET(&reason, PFRES_FRAG); 7005 goto done; 7006 case IPPROTO_ROUTING: { 7007 struct ip6_rthdr rthdr; 7008 7009 if (rh_cnt++) { 7010 DPFPRINTF(PF_DEBUG_MISC, 7011 ("pf: IPv6 more than one rthdr\n")); 7012 action = PF_DROP; 7013 REASON_SET(&reason, PFRES_IPOPTIONS); 7014 log = 1; 7015 goto done; 7016 } 7017 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 7018 &reason, pd.af)) { 7019 DPFPRINTF(PF_DEBUG_MISC, 7020 ("pf: IPv6 short rthdr\n")); 7021 action = PF_DROP; 7022 REASON_SET(&reason, PFRES_SHORT); 7023 log = 1; 7024 goto done; 7025 } 7026 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 7027 DPFPRINTF(PF_DEBUG_MISC, 7028 ("pf: IPv6 rthdr0\n")); 7029 action = PF_DROP; 7030 REASON_SET(&reason, PFRES_IPOPTIONS); 7031 log = 1; 7032 goto done; 7033 } 7034 /* FALLTHROUGH */ 7035 } 7036 case IPPROTO_AH: 7037 case IPPROTO_HOPOPTS: 7038 case IPPROTO_DSTOPTS: { 7039 /* get next header and header length */ 7040 struct ip6_ext opt6; 7041 7042 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 7043 NULL, &reason, pd.af)) { 7044 DPFPRINTF(PF_DEBUG_MISC, 7045 ("pf: IPv6 short opt\n")); 7046 action = PF_DROP; 7047 log = 1; 7048 goto done; 7049 } 7050 if (pd.proto == IPPROTO_AH) 7051 off += (opt6.ip6e_len + 2) * 4; 7052 else 7053 off += (opt6.ip6e_len + 1) * 8; 7054 pd.proto = opt6.ip6e_nxt; 7055 /* goto the next header */ 7056 break; 7057 } 7058 default: 7059 terminal++; 7060 break; 7061 } 7062 } while (!terminal); 7063 7064 /* if there's no routing header, use unmodified mbuf for checksumming */ 7065 if (!n) 7066 n = m; 7067 7068 switch (pd.proto) { 7069 case IPPROTO_TCP: { 7070 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp), 7071 &action, &reason, AF_INET6)) { 7072 log = action != PF_PASS; 7073 goto done; 7074 } 7075 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2); 7076 pd.sport = &pd.hdr.tcp.th_sport; 7077 pd.dport = &pd.hdr.tcp.th_dport; 7078 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7079 if (action == PF_DROP) 7080 goto done; 7081 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7082 &reason); 7083 if (action == PF_PASS) { 7084 if (V_pfsync_update_state_ptr != NULL) 7085 V_pfsync_update_state_ptr(s); 7086 r = s->rule.ptr; 7087 a = s->anchor.ptr; 7088 log = s->log; 7089 } else if (s == NULL) 7090 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 7091 &a, &ruleset, inp); 7092 break; 7093 } 7094 7095 case IPPROTO_UDP: { 7096 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp), 7097 &action, &reason, AF_INET6)) { 7098 log = action != PF_PASS; 7099 goto done; 7100 } 7101 pd.sport = &pd.hdr.udp.uh_sport; 7102 pd.dport = &pd.hdr.udp.uh_dport; 7103 if (pd.hdr.udp.uh_dport == 0 || 7104 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off || 7105 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) { 7106 action = PF_DROP; 7107 REASON_SET(&reason, PFRES_SHORT); 7108 goto done; 7109 } 7110 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7111 if (action == PF_PASS) { 7112 if (V_pfsync_update_state_ptr != NULL) 7113 V_pfsync_update_state_ptr(s); 7114 r = s->rule.ptr; 7115 a = s->anchor.ptr; 7116 log = s->log; 7117 } else if (s == NULL) 7118 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 7119 &a, &ruleset, inp); 7120 break; 7121 } 7122 7123 case IPPROTO_ICMP: { 7124 action = PF_DROP; 7125 DPFPRINTF(PF_DEBUG_MISC, 7126 ("pf: dropping IPv6 packet with ICMPv4 payload\n")); 7127 goto done; 7128 } 7129 7130 case IPPROTO_ICMPV6: { 7131 if (!pf_pull_hdr(m, off, &pd.hdr.icmp6, sizeof(pd.hdr.icmp6), 7132 &action, &reason, AF_INET6)) { 7133 log = action != PF_PASS; 7134 goto done; 7135 } 7136 action = pf_test_state_icmp(&s, dir, kif, 7137 m, off, h, &pd, &reason); 7138 if (action == PF_PASS) { 7139 if (V_pfsync_update_state_ptr != NULL) 7140 V_pfsync_update_state_ptr(s); 7141 r = s->rule.ptr; 7142 a = s->anchor.ptr; 7143 log = s->log; 7144 } else if (s == NULL) 7145 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 7146 &a, &ruleset, inp); 7147 break; 7148 } 7149 7150 default: 7151 action = pf_test_state_other(&s, dir, kif, m, &pd); 7152 if (action == PF_PASS) { 7153 if (V_pfsync_update_state_ptr != NULL) 7154 V_pfsync_update_state_ptr(s); 7155 r = s->rule.ptr; 7156 a = s->anchor.ptr; 7157 log = s->log; 7158 } else if (s == NULL) 7159 action = pf_test_rule(&r, &s, dir, kif, m, off, &pd, 7160 &a, &ruleset, inp); 7161 break; 7162 } 7163 7164 done: 7165 PF_RULES_RUNLOCK(); 7166 if (n != m) { 7167 m_freem(n); 7168 n = NULL; 7169 } 7170 7171 /* handle dangerous IPv6 extension headers. */ 7172 if (action == PF_PASS && rh_cnt && 7173 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 7174 action = PF_DROP; 7175 REASON_SET(&reason, PFRES_IPOPTIONS); 7176 log = r->log; 7177 DPFPRINTF(PF_DEBUG_MISC, 7178 ("pf: dropping packet with dangerous v6 headers\n")); 7179 } 7180 7181 if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) { 7182 action = PF_DROP; 7183 REASON_SET(&reason, PFRES_MEMORY); 7184 } 7185 if (r->rtableid >= 0) 7186 M_SETFIB(m, r->rtableid); 7187 7188 if (r->scrub_flags & PFSTATE_SETPRIO) { 7189 if (pd.tos & IPTOS_LOWDELAY) 7190 pqid = 1; 7191 if (vlan_set_pcp(m, r->set_prio[pqid])) { 7192 action = PF_DROP; 7193 REASON_SET(&reason, PFRES_MEMORY); 7194 log = 1; 7195 DPFPRINTF(PF_DEBUG_MISC, 7196 ("pf: failed to allocate 802.1q mtag\n")); 7197 } 7198 } 7199 7200 #ifdef ALTQ 7201 if (s && s->qid) { 7202 pd.act.pqid = s->pqid; 7203 pd.act.qid = s->qid; 7204 } else if (r->qid) { 7205 pd.act.pqid = r->pqid; 7206 pd.act.qid = r->qid; 7207 } 7208 if (action == PF_PASS && pd.act.qid) { 7209 if (pd.pf_mtag == NULL && 7210 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 7211 action = PF_DROP; 7212 REASON_SET(&reason, PFRES_MEMORY); 7213 } else { 7214 if (s != NULL) 7215 pd.pf_mtag->qid_hash = pf_state_hash(s); 7216 if (pd.tos & IPTOS_LOWDELAY) 7217 pd.pf_mtag->qid = pd.act.pqid; 7218 else 7219 pd.pf_mtag->qid = pd.act.qid; 7220 /* Add hints for ecn. */ 7221 pd.pf_mtag->hdr = h; 7222 } 7223 } 7224 #endif /* ALTQ */ 7225 7226 if (s && (s->dnpipe || s->dnrpipe)) { 7227 pd.act.dnpipe = s->dnpipe; 7228 pd.act.dnrpipe = s->dnrpipe; 7229 pd.act.flags = s->state_flags; 7230 } else { 7231 pd.act.dnpipe = r->dnpipe; 7232 pd.act.dnrpipe = r->dnrpipe; 7233 pd.act.flags = r->free_flags; 7234 } 7235 if ((pd.act.dnpipe || pd.act.dnrpipe) && !PACKET_LOOPED(&pd)) { 7236 if (ip_dn_io_ptr == NULL) { 7237 action = PF_DROP; 7238 REASON_SET(&reason, PFRES_MEMORY); 7239 } else { 7240 struct ip_fw_args dnflow; 7241 7242 if (pd.pf_mtag == NULL && 7243 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) { 7244 action = PF_DROP; 7245 REASON_SET(&reason, PFRES_MEMORY); 7246 if (s) 7247 PF_STATE_UNLOCK(s); 7248 return (action); 7249 } 7250 7251 if (pf_pdesc_to_dnflow(dir, &pd, r, s, &dnflow)) { 7252 ip_dn_io_ptr(m0, &dnflow); 7253 7254 if (*m0 == NULL) { 7255 if (s) 7256 PF_STATE_UNLOCK(s); 7257 return (action); 7258 } else { 7259 /* This is dummynet fast io processing */ 7260 m_tag_delete(*m0, m_tag_first(*m0)); 7261 pd.pf_mtag->flags &= ~PF_PACKET_LOOPED; 7262 } 7263 } 7264 } 7265 } 7266 7267 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7268 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7269 (s->nat_rule.ptr->action == PF_RDR || 7270 s->nat_rule.ptr->action == PF_BINAT) && 7271 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7272 m->m_flags |= M_SKIP_FIREWALL; 7273 7274 /* XXX: Anybody working on it?! */ 7275 if (r->divert.port) 7276 printf("pf: divert(9) is not supported for IPv6\n"); 7277 7278 if (log) { 7279 struct pf_krule *lr; 7280 7281 if (s != NULL && s->nat_rule.ptr != NULL && 7282 s->nat_rule.ptr->log & PF_LOG_ALL) 7283 lr = s->nat_rule.ptr; 7284 else 7285 lr = r; 7286 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset, 7287 &pd, (s == NULL)); 7288 } 7289 7290 pf_counter_u64_critical_enter(); 7291 pf_counter_u64_add_protected(&kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS], 7292 pd.tot_len); 7293 pf_counter_u64_add_protected(&kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS], 7294 1); 7295 7296 if (action == PF_PASS || r->action == PF_DROP) { 7297 dirndx = (dir == PF_OUT); 7298 pf_counter_u64_add_protected(&r->packets[dirndx], 1); 7299 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len); 7300 if (a != NULL) { 7301 pf_counter_u64_add_protected(&a->packets[dirndx], 1); 7302 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len); 7303 } 7304 if (s != NULL) { 7305 if (s->nat_rule.ptr != NULL) { 7306 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx], 7307 1); 7308 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx], 7309 pd.tot_len); 7310 } 7311 if (s->src_node != NULL) { 7312 counter_u64_add(s->src_node->packets[dirndx], 7313 1); 7314 counter_u64_add(s->src_node->bytes[dirndx], 7315 pd.tot_len); 7316 } 7317 if (s->nat_src_node != NULL) { 7318 counter_u64_add(s->nat_src_node->packets[dirndx], 7319 1); 7320 counter_u64_add(s->nat_src_node->bytes[dirndx], 7321 pd.tot_len); 7322 } 7323 dirndx = (dir == s->direction) ? 0 : 1; 7324 s->packets[dirndx]++; 7325 s->bytes[dirndx] += pd.tot_len; 7326 } 7327 tr = r; 7328 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7329 if (nr != NULL && r == &V_pf_default_rule) 7330 tr = nr; 7331 if (tr->src.addr.type == PF_ADDR_TABLE) 7332 pfr_update_stats(tr->src.addr.p.tbl, 7333 (s == NULL) ? pd.src : 7334 &s->key[(s->direction == PF_IN)]->addr[0], 7335 pd.af, pd.tot_len, dir == PF_OUT, 7336 r->action == PF_PASS, tr->src.neg); 7337 if (tr->dst.addr.type == PF_ADDR_TABLE) 7338 pfr_update_stats(tr->dst.addr.p.tbl, 7339 (s == NULL) ? pd.dst : 7340 &s->key[(s->direction == PF_IN)]->addr[1], 7341 pd.af, pd.tot_len, dir == PF_OUT, 7342 r->action == PF_PASS, tr->dst.neg); 7343 } 7344 pf_counter_u64_critical_exit(); 7345 7346 switch (action) { 7347 case PF_SYNPROXY_DROP: 7348 m_freem(*m0); 7349 case PF_DEFER: 7350 *m0 = NULL; 7351 action = PF_PASS; 7352 break; 7353 case PF_DROP: 7354 m_freem(*m0); 7355 *m0 = NULL; 7356 break; 7357 default: 7358 /* pf_route6() returns unlocked. */ 7359 if (r->rt) { 7360 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd, inp); 7361 return (action); 7362 } 7363 break; 7364 } 7365 7366 if (s) 7367 PF_STATE_UNLOCK(s); 7368 7369 /* If reassembled packet passed, create new fragments. */ 7370 if (action == PF_PASS && *m0 && (pflags & PFIL_FWD) && 7371 (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL) 7372 action = pf_refragment6(ifp, m0, mtag); 7373 7374 SDT_PROBE4(pf, ip, test6, done, action, reason, r, s); 7375 7376 return (action); 7377 } 7378 #endif /* INET6 */ 7379