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sys/netpfil/ipfw/nat64/nat64lsn.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2015-2019 Yandex LLC 5 * Copyright (c) 2015 Alexander V. Chernikov <melifaro@FreeBSD.org> 6 * Copyright (c) 2016-2019 Andrey V. Elsukov <ae@FreeBSD.org> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/counter.h> 36 #include <sys/ck.h> 37 #include <sys/epoch.h> 38 #include <sys/errno.h> 39 #include <sys/hash.h> 40 #include <sys/kernel.h> 41 #include <sys/lock.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/module.h> 45 #include <sys/rmlock.h> 46 #include <sys/socket.h> 47 #include <sys/syslog.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_var.h> 52 #include <net/if_pflog.h> 53 #include <net/pfil.h> 54 55 #include <netinet/in.h> 56 #include <netinet/ip.h> 57 #include <netinet/ip_var.h> 58 #include <netinet/ip_fw.h> 59 #include <netinet/ip6.h> 60 #include <netinet/icmp6.h> 61 #include <netinet/ip_icmp.h> 62 #include <netinet/tcp.h> 63 #include <netinet/udp.h> 64 #include <netinet6/in6_var.h> 65 #include <netinet6/ip6_var.h> 66 #include <netinet6/ip_fw_nat64.h> 67 68 #include <netpfil/ipfw/ip_fw_private.h> 69 #include <netpfil/pf/pf.h> 70 71 #include "nat64lsn.h" 72 73 MALLOC_DEFINE(M_NAT64LSN, "NAT64LSN", "NAT64LSN"); 74 75 #define NAT64LSN_EPOCH_ENTER(et) NET_EPOCH_ENTER(et) 76 #define NAT64LSN_EPOCH_EXIT(et) NET_EPOCH_EXIT(et) 77 #define NAT64LSN_EPOCH_ASSERT() NET_EPOCH_ASSERT() 78 #define NAT64LSN_EPOCH_CALL(c, f) NET_EPOCH_CALL((f), (c)) 79 80 static uma_zone_t nat64lsn_host_zone; 81 static uma_zone_t nat64lsn_pgchunk_zone; 82 static uma_zone_t nat64lsn_pg_zone; 83 static uma_zone_t nat64lsn_aliaslink_zone; 84 static uma_zone_t nat64lsn_state_zone; 85 static uma_zone_t nat64lsn_job_zone; 86 87 static void nat64lsn_periodic(void *data); 88 #define PERIODIC_DELAY 4 89 #define NAT64_LOOKUP(chain, cmd) \ 90 (struct nat64lsn_cfg *)SRV_OBJECT((chain), (cmd)->arg1) 91 /* 92 * Delayed job queue, used to create new hosts 93 * and new portgroups 94 */ 95 enum nat64lsn_jtype { 96 JTYPE_NEWHOST = 1, 97 JTYPE_NEWPORTGROUP, 98 JTYPE_DESTROY, 99 }; 100 101 struct nat64lsn_job_item { 102 STAILQ_ENTRY(nat64lsn_job_item) entries; 103 enum nat64lsn_jtype jtype; 104 105 union { 106 struct { /* used by JTYPE_NEWHOST, JTYPE_NEWPORTGROUP */ 107 struct mbuf *m; 108 struct nat64lsn_host *host; 109 struct nat64lsn_state *state; 110 uint32_t src6_hval; 111 uint32_t state_hval; 112 struct ipfw_flow_id f_id; 113 in_addr_t faddr; 114 uint16_t port; 115 uint8_t proto; 116 uint8_t done; 117 }; 118 struct { /* used by JTYPE_DESTROY */ 119 struct nat64lsn_hosts_slist hosts; 120 struct nat64lsn_pg_slist portgroups; 121 struct nat64lsn_pgchunk *pgchunk; 122 struct epoch_context epoch_ctx; 123 }; 124 }; 125 }; 126 127 static struct mtx jmtx; 128 #define JQUEUE_LOCK_INIT() mtx_init(&jmtx, "qlock", NULL, MTX_DEF) 129 #define JQUEUE_LOCK_DESTROY() mtx_destroy(&jmtx) 130 #define JQUEUE_LOCK() mtx_lock(&jmtx) 131 #define JQUEUE_UNLOCK() mtx_unlock(&jmtx) 132 133 static int nat64lsn_alloc_host(struct nat64lsn_cfg *cfg, 134 struct nat64lsn_job_item *ji); 135 static int nat64lsn_alloc_pg(struct nat64lsn_cfg *cfg, 136 struct nat64lsn_job_item *ji); 137 static struct nat64lsn_job_item *nat64lsn_create_job( 138 struct nat64lsn_cfg *cfg, int jtype); 139 static void nat64lsn_enqueue_job(struct nat64lsn_cfg *cfg, 140 struct nat64lsn_job_item *ji); 141 static void nat64lsn_job_destroy(epoch_context_t ctx); 142 static void nat64lsn_destroy_host(struct nat64lsn_host *host); 143 static void nat64lsn_destroy_pg(struct nat64lsn_pg *pg); 144 145 static int nat64lsn_translate4(struct nat64lsn_cfg *cfg, 146 const struct ipfw_flow_id *f_id, struct mbuf **mp); 147 static int nat64lsn_translate6(struct nat64lsn_cfg *cfg, 148 struct ipfw_flow_id *f_id, struct mbuf **mp); 149 static int nat64lsn_translate6_internal(struct nat64lsn_cfg *cfg, 150 struct mbuf **mp, struct nat64lsn_state *state, uint8_t flags); 151 152 #define NAT64_BIT_TCP_FIN 0 /* FIN was seen */ 153 #define NAT64_BIT_TCP_SYN 1 /* First syn in->out */ 154 #define NAT64_BIT_TCP_ESTAB 2 /* Packet with Ack */ 155 #define NAT64_BIT_READY_IPV4 6 /* state is ready for translate4 */ 156 #define NAT64_BIT_STALE 7 /* state is going to be expired */ 157 158 #define NAT64_FLAG_FIN (1 << NAT64_BIT_TCP_FIN) 159 #define NAT64_FLAG_SYN (1 << NAT64_BIT_TCP_SYN) 160 #define NAT64_FLAG_ESTAB (1 << NAT64_BIT_TCP_ESTAB) 161 #define NAT64_FLAGS_TCP (NAT64_FLAG_SYN|NAT64_FLAG_ESTAB|NAT64_FLAG_FIN) 162 163 #define NAT64_FLAG_READY (1 << NAT64_BIT_READY_IPV4) 164 #define NAT64_FLAG_STALE (1 << NAT64_BIT_STALE) 165 166 static inline uint8_t 167 convert_tcp_flags(uint8_t flags) 168 { 169 uint8_t result; 170 171 result = flags & (TH_FIN|TH_SYN); 172 result |= (flags & TH_RST) >> 2; /* Treat RST as FIN */ 173 result |= (flags & TH_ACK) >> 2; /* Treat ACK as estab */ 174 175 return (result); 176 } 177 178 static void 179 nat64lsn_log(struct pfloghdr *plog, struct mbuf *m, sa_family_t family, 180 struct nat64lsn_state *state) 181 { 182 183 memset(plog, 0, sizeof(*plog)); 184 plog->length = PFLOG_HDRLEN; 185 plog->af = family; 186 plog->action = PF_NAT; 187 plog->dir = PF_IN; 188 plog->rulenr = htonl(state->ip_src); 189 plog->subrulenr = htonl((uint32_t)(state->aport << 16) | 190 (state->proto << 8) | (state->ip_dst & 0xff)); 191 plog->ruleset[0] = '\0'; 192 strlcpy(plog->ifname, "NAT64LSN", sizeof(plog->ifname)); 193 ipfw_bpf_mtap2(plog, PFLOG_HDRLEN, m); 194 } 195 196 #define HVAL(p, n, s) jenkins_hash32((const uint32_t *)(p), (n), (s)) 197 #define HOST_HVAL(c, a) HVAL((a),\ 198 sizeof(struct in6_addr) / sizeof(uint32_t), (c)->hash_seed) 199 #define HOSTS(c, v) ((c)->hosts_hash[(v) & ((c)->hosts_hashsize - 1)]) 200 201 #define ALIASLINK_HVAL(c, f) HVAL(&(f)->dst_ip6,\ 202 sizeof(struct in6_addr) * 2 / sizeof(uint32_t), (c)->hash_seed) 203 #define ALIAS_BYHASH(c, v) \ 204 ((c)->aliases[(v) & ((1 << (32 - (c)->plen4)) - 1)]) 205 static struct nat64lsn_aliaslink* 206 nat64lsn_get_aliaslink(struct nat64lsn_cfg *cfg __unused, 207 struct nat64lsn_host *host, const struct ipfw_flow_id *f_id __unused) 208 { 209 210 /* 211 * We can implement some different algorithms how 212 * select an alias address. 213 * XXX: for now we use first available. 214 */ 215 return (CK_SLIST_FIRST(&host->aliases)); 216 } 217 218 #define STATE_HVAL(c, d) HVAL((d), 2, (c)->hash_seed) 219 #define STATE_HASH(h, v) \ 220 ((h)->states_hash[(v) & ((h)->states_hashsize - 1)]) 221 #define STATES_CHUNK(p, v) \ 222 ((p)->chunks_count == 1 ? (p)->states : \ 223 ((p)->states_chunk[CHUNK_BY_FADDR(p, v)])) 224 225 #ifdef __LP64__ 226 #define FREEMASK_FFSLL(pg, faddr) \ 227 ffsll(*FREEMASK_CHUNK((pg), (faddr))) 228 #define FREEMASK_BTR(pg, faddr, bit) \ 229 ck_pr_btr_64(FREEMASK_CHUNK((pg), (faddr)), (bit)) 230 #define FREEMASK_BTS(pg, faddr, bit) \ 231 ck_pr_bts_64(FREEMASK_CHUNK((pg), (faddr)), (bit)) 232 #define FREEMASK_ISSET(pg, faddr, bit) \ 233 ISSET64(*FREEMASK_CHUNK((pg), (faddr)), (bit)) 234 #define FREEMASK_COPY(pg, n, out) \ 235 (out) = ck_pr_load_64(FREEMASK_CHUNK((pg), (n))) 236 #else 237 static inline int 238 freemask_ffsll(uint32_t *freemask) 239 { 240 int i; 241 242 if ((i = ffsl(freemask[0])) != 0) 243 return (i); 244 if ((i = ffsl(freemask[1])) != 0) 245 return (i + 32); 246 return (0); 247 } 248 #define FREEMASK_FFSLL(pg, faddr) \ 249 freemask_ffsll(FREEMASK_CHUNK((pg), (faddr))) 250 #define FREEMASK_BTR(pg, faddr, bit) \ 251 ck_pr_btr_32(FREEMASK_CHUNK((pg), (faddr)) + (bit) / 32, (bit) % 32) 252 #define FREEMASK_BTS(pg, faddr, bit) \ 253 ck_pr_bts_32(FREEMASK_CHUNK((pg), (faddr)) + (bit) / 32, (bit) % 32) 254 #define FREEMASK_ISSET(pg, faddr, bit) \ 255 ISSET32(*(FREEMASK_CHUNK((pg), (faddr)) + (bit) / 32), (bit) % 32) 256 #define FREEMASK_COPY(pg, n, out) \ 257 (out) = ck_pr_load_32(FREEMASK_CHUNK((pg), (n))) | \ 258 ((uint64_t)ck_pr_load_32(FREEMASK_CHUNK((pg), (n)) + 1) << 32) 259 #endif /* !__LP64__ */ 260 261 #define NAT64LSN_TRY_PGCNT 32 262 static struct nat64lsn_pg* 263 nat64lsn_get_pg(uint32_t *chunkmask, uint32_t *pgmask, 264 struct nat64lsn_pgchunk **chunks, struct nat64lsn_pg **pgptr, 265 uint32_t *pgidx, in_addr_t faddr) 266 { 267 struct nat64lsn_pg *pg, *oldpg; 268 uint32_t idx, oldidx; 269 int cnt; 270 271 cnt = 0; 272 /* First try last used PG */ 273 oldpg = pg = ck_pr_load_ptr(pgptr); 274 idx = oldidx = ck_pr_load_32(pgidx); 275 /* If pgidx is out of range, reset it to the first pgchunk */ 276 if (!ISSET32(*chunkmask, idx / 32)) 277 idx = 0; 278 do { 279 ck_pr_fence_load(); 280 if (pg != NULL && FREEMASK_BITCOUNT(pg, faddr) > 0) { 281 /* 282 * If last used PG has not free states, 283 * try to update pointer. 284 * NOTE: it can be already updated by jobs handler, 285 * thus we use CAS operation. 286 */ 287 if (cnt > 0) 288 ck_pr_cas_ptr(pgptr, oldpg, pg); 289 return (pg); 290 } 291 /* Stop if idx is out of range */ 292 if (!ISSET32(*chunkmask, idx / 32)) 293 break; 294 295 if (ISSET32(pgmask[idx / 32], idx % 32)) 296 pg = ck_pr_load_ptr( 297 &chunks[idx / 32]->pgptr[idx % 32]); 298 else 299 pg = NULL; 300 301 idx++; 302 } while (++cnt < NAT64LSN_TRY_PGCNT); 303 304 /* If pgidx is out of range, reset it to the first pgchunk */ 305 if (!ISSET32(*chunkmask, idx / 32)) 306 idx = 0; 307 ck_pr_cas_32(pgidx, oldidx, idx); 308 return (NULL); 309 } 310 311 static struct nat64lsn_state* 312 nat64lsn_get_state6to4(struct nat64lsn_cfg *cfg, struct nat64lsn_host *host, 313 const struct ipfw_flow_id *f_id, uint32_t hval, in_addr_t faddr, 314 uint16_t port, uint8_t proto) 315 { 316 struct nat64lsn_aliaslink *link; 317 struct nat64lsn_state *state; 318 struct nat64lsn_pg *pg; 319 int i, offset; 320 321 NAT64LSN_EPOCH_ASSERT(); 322 323 /* Check that we already have state for given arguments */ 324 CK_SLIST_FOREACH(state, &STATE_HASH(host, hval), entries) { 325 if (state->proto == proto && state->ip_dst == faddr && 326 state->sport == port && state->dport == f_id->dst_port) 327 return (state); 328 } 329 330 link = nat64lsn_get_aliaslink(cfg, host, f_id); 331 if (link == NULL) 332 return (NULL); 333 334 switch (proto) { 335 case IPPROTO_TCP: 336 pg = nat64lsn_get_pg( 337 &link->alias->tcp_chunkmask, link->alias->tcp_pgmask, 338 link->alias->tcp, &link->alias->tcp_pg, 339 &link->alias->tcp_pgidx, faddr); 340 break; 341 case IPPROTO_UDP: 342 pg = nat64lsn_get_pg( 343 &link->alias->udp_chunkmask, link->alias->udp_pgmask, 344 link->alias->udp, &link->alias->udp_pg, 345 &link->alias->udp_pgidx, faddr); 346 break; 347 case IPPROTO_ICMP: 348 pg = nat64lsn_get_pg( 349 &link->alias->icmp_chunkmask, link->alias->icmp_pgmask, 350 link->alias->icmp, &link->alias->icmp_pg, 351 &link->alias->icmp_pgidx, faddr); 352 break; 353 default: 354 panic("%s: wrong proto %d", __func__, proto); 355 } 356 if (pg == NULL) 357 return (NULL); 358 359 /* Check that PG has some free states */ 360 state = NULL; 361 i = FREEMASK_BITCOUNT(pg, faddr); 362 while (i-- > 0) { 363 offset = FREEMASK_FFSLL(pg, faddr); 364 if (offset == 0) { 365 /* 366 * We lost the race. 367 * No more free states in this PG. 368 */ 369 break; 370 } 371 372 /* Lets try to atomically grab the state */ 373 if (FREEMASK_BTR(pg, faddr, offset - 1)) { 374 state = &STATES_CHUNK(pg, faddr)->state[offset - 1]; 375 /* Initialize */ 376 state->flags = proto != IPPROTO_TCP ? 0 : 377 convert_tcp_flags(f_id->_flags); 378 state->proto = proto; 379 state->aport = pg->base_port + offset - 1; 380 state->dport = f_id->dst_port; 381 state->sport = port; 382 state->ip6_dst = f_id->dst_ip6; 383 state->ip_dst = faddr; 384 state->ip_src = link->alias->addr; 385 state->hval = hval; 386 state->host = host; 387 SET_AGE(state->timestamp); 388 389 /* Insert new state into host's hash table */ 390 HOST_LOCK(host); 391 CK_SLIST_INSERT_HEAD(&STATE_HASH(host, hval), 392 state, entries); 393 host->states_count++; 394 /* 395 * XXX: In case if host is going to be expired, 396 * reset NAT64LSN_DEADHOST flag. 397 */ 398 host->flags &= ~NAT64LSN_DEADHOST; 399 HOST_UNLOCK(host); 400 NAT64STAT_INC(&cfg->base.stats, screated); 401 /* Mark the state as ready for translate4 */ 402 ck_pr_fence_store(); 403 ck_pr_bts_32(&state->flags, NAT64_BIT_READY_IPV4); 404 break; 405 } 406 } 407 return (state); 408 } 409 410 /* 411 * Inspects icmp packets to see if the message contains different 412 * packet header so we need to alter @addr and @port. 413 */ 414 static int 415 inspect_icmp_mbuf(struct mbuf **mp, uint8_t *proto, uint32_t *addr, 416 uint16_t *port) 417 { 418 struct icmp *icmp; 419 struct ip *ip; 420 int off; 421 uint8_t inner_proto; 422 423 ip = mtod(*mp, struct ip *); /* Outer IP header */ 424 off = (ip->ip_hl << 2) + ICMP_MINLEN; 425 if ((*mp)->m_len < off) 426 *mp = m_pullup(*mp, off); 427 if (*mp == NULL) 428 return (ENOMEM); 429 430 ip = mtod(*mp, struct ip *); /* Outer IP header */ 431 icmp = L3HDR(ip, struct icmp *); 432 switch (icmp->icmp_type) { 433 case ICMP_ECHO: 434 case ICMP_ECHOREPLY: 435 /* Use icmp ID as distinguisher */ 436 *port = ntohs(icmp->icmp_id); 437 return (0); 438 case ICMP_UNREACH: 439 case ICMP_TIMXCEED: 440 break; 441 default: 442 return (EOPNOTSUPP); 443 } 444 /* 445 * ICMP_UNREACH and ICMP_TIMXCEED contains IP header + 64 bits 446 * of ULP header. 447 */ 448 if ((*mp)->m_pkthdr.len < off + sizeof(struct ip) + ICMP_MINLEN) 449 return (EINVAL); 450 if ((*mp)->m_len < off + sizeof(struct ip) + ICMP_MINLEN) 451 *mp = m_pullup(*mp, off + sizeof(struct ip) + ICMP_MINLEN); 452 if (*mp == NULL) 453 return (ENOMEM); 454 ip = mtodo(*mp, off); /* Inner IP header */ 455 inner_proto = ip->ip_p; 456 off += ip->ip_hl << 2; /* Skip inner IP header */ 457 *addr = ntohl(ip->ip_src.s_addr); 458 if ((*mp)->m_len < off + ICMP_MINLEN) 459 *mp = m_pullup(*mp, off + ICMP_MINLEN); 460 if (*mp == NULL) 461 return (ENOMEM); 462 switch (inner_proto) { 463 case IPPROTO_TCP: 464 case IPPROTO_UDP: 465 /* Copy source port from the header */ 466 *port = ntohs(*((uint16_t *)mtodo(*mp, off))); 467 *proto = inner_proto; 468 return (0); 469 case IPPROTO_ICMP: 470 /* 471 * We will translate only ICMP errors for our ICMP 472 * echo requests. 473 */ 474 icmp = mtodo(*mp, off); 475 if (icmp->icmp_type != ICMP_ECHO) 476 return (EOPNOTSUPP); 477 *port = ntohs(icmp->icmp_id); 478 return (0); 479 }; 480 return (EOPNOTSUPP); 481 } 482 483 static struct nat64lsn_state* 484 nat64lsn_get_state4to6(struct nat64lsn_cfg *cfg, struct nat64lsn_alias *alias, 485 in_addr_t faddr, uint16_t port, uint8_t proto) 486 { 487 struct nat64lsn_state *state; 488 struct nat64lsn_pg *pg; 489 int chunk_idx, pg_idx, state_idx; 490 491 NAT64LSN_EPOCH_ASSERT(); 492 493 if (port < NAT64_MIN_PORT) 494 return (NULL); 495 /* 496 * Alias keeps 32 pgchunks for each protocol. 497 * Each pgchunk has 32 pointers to portgroup. 498 * Each portgroup has 64 states for ports. 499 */ 500 port -= NAT64_MIN_PORT; 501 chunk_idx = port / 2048; 502 503 port -= chunk_idx * 2048; 504 pg_idx = port / 64; 505 state_idx = port % 64; 506 507 /* 508 * First check in proto_chunkmask that we have allocated PG chunk. 509 * Then check in proto_pgmask that we have valid PG pointer. 510 */ 511 pg = NULL; 512 switch (proto) { 513 case IPPROTO_TCP: 514 if (ISSET32(alias->tcp_chunkmask, chunk_idx) && 515 ISSET32(alias->tcp_pgmask[chunk_idx], pg_idx)) { 516 pg = alias->tcp[chunk_idx]->pgptr[pg_idx]; 517 break; 518 } 519 return (NULL); 520 case IPPROTO_UDP: 521 if (ISSET32(alias->udp_chunkmask, chunk_idx) && 522 ISSET32(alias->udp_pgmask[chunk_idx], pg_idx)) { 523 pg = alias->udp[chunk_idx]->pgptr[pg_idx]; 524 break; 525 } 526 return (NULL); 527 case IPPROTO_ICMP: 528 if (ISSET32(alias->icmp_chunkmask, chunk_idx) && 529 ISSET32(alias->icmp_pgmask[chunk_idx], pg_idx)) { 530 pg = alias->icmp[chunk_idx]->pgptr[pg_idx]; 531 break; 532 } 533 return (NULL); 534 default: 535 panic("%s: wrong proto %d", __func__, proto); 536 } 537 if (pg == NULL) 538 return (NULL); 539 540 if (FREEMASK_ISSET(pg, faddr, state_idx)) 541 return (NULL); 542 543 state = &STATES_CHUNK(pg, faddr)->state[state_idx]; 544 ck_pr_fence_load(); 545 if (ck_pr_load_32(&state->flags) & NAT64_FLAG_READY) 546 return (state); 547 return (NULL); 548 } 549 550 /* 551 * Reassemble IPv4 fragments, make PULLUP if needed, get some ULP fields 552 * that might be unknown until reassembling is completed. 553 */ 554 static struct mbuf* 555 nat64lsn_reassemble4(struct nat64lsn_cfg *cfg, struct mbuf *m, 556 uint16_t *port) 557 { 558 struct ip *ip; 559 int len; 560 561 m = ip_reass(m); 562 if (m == NULL) 563 return (NULL); 564 /* IP header must be contigious after ip_reass() */ 565 ip = mtod(m, struct ip *); 566 len = ip->ip_hl << 2; 567 switch (ip->ip_p) { 568 case IPPROTO_ICMP: 569 len += ICMP_MINLEN; /* Enough to get icmp_id */ 570 break; 571 case IPPROTO_TCP: 572 len += sizeof(struct tcphdr); 573 break; 574 case IPPROTO_UDP: 575 len += sizeof(struct udphdr); 576 break; 577 default: 578 m_freem(m); 579 NAT64STAT_INC(&cfg->base.stats, noproto); 580 return (NULL); 581 } 582 if (m->m_len < len) { 583 m = m_pullup(m, len); 584 if (m == NULL) { 585 NAT64STAT_INC(&cfg->base.stats, nomem); 586 return (NULL); 587 } 588 ip = mtod(m, struct ip *); 589 } 590 switch (ip->ip_p) { 591 case IPPROTO_TCP: 592 *port = ntohs(L3HDR(ip, struct tcphdr *)->th_dport); 593 break; 594 case IPPROTO_UDP: 595 *port = ntohs(L3HDR(ip, struct udphdr *)->uh_dport); 596 break; 597 } 598 return (m); 599 } 600 601 static int 602 nat64lsn_translate4(struct nat64lsn_cfg *cfg, 603 const struct ipfw_flow_id *f_id, struct mbuf **mp) 604 { 605 struct pfloghdr loghdr, *logdata; 606 struct in6_addr src6; 607 struct nat64lsn_state *state; 608 struct nat64lsn_alias *alias; 609 uint32_t addr, flags; 610 uint16_t port, ts; 611 int ret; 612 uint8_t proto; 613 614 addr = f_id->dst_ip; 615 port = f_id->dst_port; 616 proto = f_id->proto; 617 if (addr < cfg->prefix4 || addr > cfg->pmask4) { 618 NAT64STAT_INC(&cfg->base.stats, nomatch4); 619 return (cfg->nomatch_verdict); 620 } 621 622 /* Reassemble fragments if needed */ 623 ret = ntohs(mtod(*mp, struct ip *)->ip_off); 624 if ((ret & (IP_MF | IP_OFFMASK)) != 0) { 625 *mp = nat64lsn_reassemble4(cfg, *mp, &port); 626 if (*mp == NULL) 627 return (IP_FW_DENY); 628 } 629 630 /* Check if protocol is supported */ 631 switch (proto) { 632 case IPPROTO_ICMP: 633 ret = inspect_icmp_mbuf(mp, &proto, &addr, &port); 634 if (ret != 0) { 635 if (ret == ENOMEM) { 636 NAT64STAT_INC(&cfg->base.stats, nomem); 637 return (IP_FW_DENY); 638 } 639 NAT64STAT_INC(&cfg->base.stats, noproto); 640 return (cfg->nomatch_verdict); 641 } 642 if (addr < cfg->prefix4 || addr > cfg->pmask4) { 643 NAT64STAT_INC(&cfg->base.stats, nomatch4); 644 return (cfg->nomatch_verdict); 645 } 646 /* FALLTHROUGH */ 647 case IPPROTO_TCP: 648 case IPPROTO_UDP: 649 break; 650 default: 651 NAT64STAT_INC(&cfg->base.stats, noproto); 652 return (cfg->nomatch_verdict); 653 } 654 655 alias = &ALIAS_BYHASH(cfg, addr); 656 MPASS(addr == alias->addr); 657 658 /* Check that we have state for this port */ 659 state = nat64lsn_get_state4to6(cfg, alias, f_id->src_ip, 660 port, proto); 661 if (state == NULL) { 662 NAT64STAT_INC(&cfg->base.stats, nomatch4); 663 return (cfg->nomatch_verdict); 664 } 665 666 /* TODO: Check flags to see if we need to do some static mapping */ 667 668 /* Update some state fields if need */ 669 SET_AGE(ts); 670 if (f_id->proto == IPPROTO_TCP) 671 flags = convert_tcp_flags(f_id->_flags); 672 else 673 flags = 0; 674 if (state->timestamp != ts) 675 state->timestamp = ts; 676 if ((state->flags & flags) != flags) 677 state->flags |= flags; 678 679 port = htons(state->sport); 680 src6 = state->ip6_dst; 681 682 if (cfg->base.flags & NAT64_LOG) { 683 logdata = &loghdr; 684 nat64lsn_log(logdata, *mp, AF_INET, state); 685 } else 686 logdata = NULL; 687 688 /* 689 * We already have src6 with embedded address, but it is possible, 690 * that src_ip is different than state->ip_dst, this is why we 691 * do embedding again. 692 */ 693 nat64_embed_ip4(&src6, cfg->base.plat_plen, htonl(f_id->src_ip)); 694 ret = nat64_do_handle_ip4(*mp, &src6, &state->host->addr, port, 695 &cfg->base, logdata); 696 if (ret == NAT64SKIP) 697 return (cfg->nomatch_verdict); 698 if (ret == NAT64RETURN) 699 *mp = NULL; 700 return (IP_FW_DENY); 701 } 702 703 /* 704 * Check if particular state is stale and should be deleted. 705 * Return 1 if true, 0 otherwise. 706 */ 707 static int 708 nat64lsn_check_state(struct nat64lsn_cfg *cfg, struct nat64lsn_state *state) 709 { 710 int age, ttl; 711 712 /* State was marked as stale in previous pass. */ 713 if (ISSET32(state->flags, NAT64_BIT_STALE)) 714 return (1); 715 716 /* State is not yet initialized, it is going to be READY */ 717 if (!ISSET32(state->flags, NAT64_BIT_READY_IPV4)) 718 return (0); 719 720 age = GET_AGE(state->timestamp); 721 switch (state->proto) { 722 case IPPROTO_TCP: 723 if (ISSET32(state->flags, NAT64_BIT_TCP_FIN)) 724 ttl = cfg->st_close_ttl; 725 else if (ISSET32(state->flags, NAT64_BIT_TCP_ESTAB)) 726 ttl = cfg->st_estab_ttl; 727 else if (ISSET32(state->flags, NAT64_BIT_TCP_SYN)) 728 ttl = cfg->st_syn_ttl; 729 else 730 ttl = cfg->st_syn_ttl; 731 if (age > ttl) 732 return (1); 733 break; 734 case IPPROTO_UDP: 735 if (age > cfg->st_udp_ttl) 736 return (1); 737 break; 738 case IPPROTO_ICMP: 739 if (age > cfg->st_icmp_ttl) 740 return (1); 741 break; 742 } 743 return (0); 744 } 745 746 static int 747 nat64lsn_maintain_pg(struct nat64lsn_cfg *cfg, struct nat64lsn_pg *pg) 748 { 749 struct nat64lsn_state *state; 750 struct nat64lsn_host *host; 751 uint64_t freemask; 752 int c, i, update_age; 753 754 update_age = 0; 755 for (c = 0; c < pg->chunks_count; c++) { 756 FREEMASK_COPY(pg, c, freemask); 757 for (i = 0; i < 64; i++) { 758 if (ISSET64(freemask, i)) 759 continue; 760 state = &STATES_CHUNK(pg, c)->state[i]; 761 if (nat64lsn_check_state(cfg, state) == 0) { 762 update_age = 1; 763 continue; 764 } 765 /* 766 * Expire state: 767 * 1. Mark as STALE and unlink from host's hash. 768 * 2. Set bit in freemask. 769 */ 770 if (ISSET32(state->flags, NAT64_BIT_STALE)) { 771 /* 772 * State was marked as STALE in previous 773 * pass. Now it is safe to release it. 774 */ 775 state->flags = 0; 776 ck_pr_fence_store(); 777 FREEMASK_BTS(pg, c, i); 778 NAT64STAT_INC(&cfg->base.stats, sdeleted); 779 continue; 780 } 781 MPASS(state->flags & NAT64_FLAG_READY); 782 783 host = state->host; 784 HOST_LOCK(host); 785 CK_SLIST_REMOVE(&STATE_HASH(host, state->hval), 786 state, nat64lsn_state, entries); 787 host->states_count--; 788 HOST_UNLOCK(host); 789 790 /* Reset READY flag */ 791 ck_pr_btr_32(&state->flags, NAT64_BIT_READY_IPV4); 792 /* And set STALE flag */ 793 ck_pr_bts_32(&state->flags, NAT64_BIT_STALE); 794 ck_pr_fence_store(); 795 /* 796 * Now translate6 will not use this state, wait 797 * until it become safe for translate4, then mark 798 * state as free. 799 */ 800 } 801 } 802 803 /* 804 * We have some alive states, update timestamp. 805 */ 806 if (update_age) 807 SET_AGE(pg->timestamp); 808 809 if (GET_AGE(pg->timestamp) < cfg->pg_delete_delay) 810 return (0); 811 812 return (1); 813 } 814 815 static void 816 nat64lsn_expire_portgroups(struct nat64lsn_cfg *cfg, 817 struct nat64lsn_pg_slist *portgroups) 818 { 819 struct nat64lsn_alias *alias; 820 struct nat64lsn_pg *pg, *tpg, *firstpg, **pgptr; 821 uint32_t *pgmask, *pgidx; 822 int i, idx; 823 824 for (i = 0; i < 1 << (32 - cfg->plen4); i++) { 825 alias = &cfg->aliases[i]; 826 CK_SLIST_FOREACH_SAFE(pg, &alias->portgroups, entries, tpg) { 827 if (nat64lsn_maintain_pg(cfg, pg) == 0) 828 continue; 829 /* Always keep first PG */ 830 if (pg->base_port == NAT64_MIN_PORT) 831 continue; 832 /* 833 * PG is expired, unlink it and schedule for 834 * deferred destroying. 835 */ 836 idx = (pg->base_port - NAT64_MIN_PORT) / 64; 837 switch (pg->proto) { 838 case IPPROTO_TCP: 839 pgmask = alias->tcp_pgmask; 840 pgptr = &alias->tcp_pg; 841 pgidx = &alias->tcp_pgidx; 842 firstpg = alias->tcp[0]->pgptr[0]; 843 break; 844 case IPPROTO_UDP: 845 pgmask = alias->udp_pgmask; 846 pgptr = &alias->udp_pg; 847 pgidx = &alias->udp_pgidx; 848 firstpg = alias->udp[0]->pgptr[0]; 849 break; 850 case IPPROTO_ICMP: 851 pgmask = alias->icmp_pgmask; 852 pgptr = &alias->icmp_pg; 853 pgidx = &alias->icmp_pgidx; 854 firstpg = alias->icmp[0]->pgptr[0]; 855 break; 856 } 857 /* Reset the corresponding bit in pgmask array. */ 858 ck_pr_btr_32(&pgmask[idx / 32], idx % 32); 859 ck_pr_fence_store(); 860 /* If last used PG points to this PG, reset it. */ 861 ck_pr_cas_ptr(pgptr, pg, firstpg); 862 ck_pr_cas_32(pgidx, idx, 0); 863 /* Unlink PG from alias's chain */ 864 ALIAS_LOCK(alias); 865 CK_SLIST_REMOVE(&alias->portgroups, pg, 866 nat64lsn_pg, entries); 867 alias->portgroups_count--; 868 ALIAS_UNLOCK(alias); 869 /* And link to job's chain for deferred destroying */ 870 NAT64STAT_INC(&cfg->base.stats, spgdeleted); 871 CK_SLIST_INSERT_HEAD(portgroups, pg, entries); 872 } 873 } 874 } 875 876 static void 877 nat64lsn_expire_hosts(struct nat64lsn_cfg *cfg, 878 struct nat64lsn_hosts_slist *hosts) 879 { 880 struct nat64lsn_host *host, *tmp; 881 int i; 882 883 for (i = 0; i < cfg->hosts_hashsize; i++) { 884 CK_SLIST_FOREACH_SAFE(host, &cfg->hosts_hash[i], 885 entries, tmp) { 886 /* Is host was marked in previous call? */ 887 if (host->flags & NAT64LSN_DEADHOST) { 888 if (host->states_count > 0) { 889 host->flags &= ~NAT64LSN_DEADHOST; 890 continue; 891 } 892 /* 893 * Unlink host from hash table and schedule 894 * it for deferred destroying. 895 */ 896 CFG_LOCK(cfg); 897 CK_SLIST_REMOVE(&cfg->hosts_hash[i], host, 898 nat64lsn_host, entries); 899 cfg->hosts_count--; 900 CFG_UNLOCK(cfg); 901 CK_SLIST_INSERT_HEAD(hosts, host, entries); 902 continue; 903 } 904 if (GET_AGE(host->timestamp) < cfg->host_delete_delay) 905 continue; 906 if (host->states_count > 0) 907 continue; 908 /* Mark host as going to be expired in next pass */ 909 host->flags |= NAT64LSN_DEADHOST; 910 ck_pr_fence_store(); 911 } 912 } 913 } 914 915 static struct nat64lsn_pgchunk* 916 nat64lsn_expire_pgchunk(struct nat64lsn_cfg *cfg) 917 { 918 #if 0 919 struct nat64lsn_alias *alias; 920 struct nat64lsn_pgchunk *chunk; 921 uint32_t pgmask; 922 int i, c; 923 924 for (i = 0; i < 1 << (32 - cfg->plen4); i++) { 925 alias = &cfg->aliases[i]; 926 if (GET_AGE(alias->timestamp) < cfg->pgchunk_delete_delay) 927 continue; 928 /* Always keep single chunk allocated */ 929 for (c = 1; c < 32; c++) { 930 if ((alias->tcp_chunkmask & (1 << c)) == 0) 931 break; 932 chunk = ck_pr_load_ptr(&alias->tcp[c]); 933 if (ck_pr_load_32(&alias->tcp_pgmask[c]) != 0) 934 continue; 935 ck_pr_btr_32(&alias->tcp_chunkmask, c); 936 ck_pr_fence_load(); 937 if (ck_pr_load_32(&alias->tcp_pgmask[c]) != 0) 938 continue; 939 } 940 } 941 #endif 942 return (NULL); 943 } 944 945 #if 0 946 static void 947 nat64lsn_maintain_hosts(struct nat64lsn_cfg *cfg) 948 { 949 struct nat64lsn_host *h; 950 struct nat64lsn_states_slist *hash; 951 int i, j, hsize; 952 953 for (i = 0; i < cfg->hosts_hashsize; i++) { 954 CK_SLIST_FOREACH(h, &cfg->hosts_hash[i], entries) { 955 if (h->states_count / 2 < h->states_hashsize || 956 h->states_hashsize >= NAT64LSN_MAX_HSIZE) 957 continue; 958 hsize = h->states_hashsize * 2; 959 hash = malloc(sizeof(*hash)* hsize, M_NOWAIT); 960 if (hash == NULL) 961 continue; 962 for (j = 0; j < hsize; j++) 963 CK_SLIST_INIT(&hash[i]); 964 965 ck_pr_bts_32(&h->flags, NAT64LSN_GROWHASH); 966 } 967 } 968 } 969 #endif 970 971 /* 972 * This procedure is used to perform various maintenance 973 * on dynamic hash list. Currently it is called every 4 seconds. 974 */ 975 static void 976 nat64lsn_periodic(void *data) 977 { 978 struct nat64lsn_job_item *ji; 979 struct nat64lsn_cfg *cfg; 980 981 cfg = (struct nat64lsn_cfg *) data; 982 CURVNET_SET(cfg->vp); 983 if (cfg->hosts_count > 0) { 984 ji = uma_zalloc(nat64lsn_job_zone, M_NOWAIT); 985 if (ji != NULL) { 986 ji->jtype = JTYPE_DESTROY; 987 CK_SLIST_INIT(&ji->hosts); 988 CK_SLIST_INIT(&ji->portgroups); 989 nat64lsn_expire_hosts(cfg, &ji->hosts); 990 nat64lsn_expire_portgroups(cfg, &ji->portgroups); 991 ji->pgchunk = nat64lsn_expire_pgchunk(cfg); 992 NAT64LSN_EPOCH_CALL(&ji->epoch_ctx, 993 nat64lsn_job_destroy); 994 } else 995 NAT64STAT_INC(&cfg->base.stats, jnomem); 996 } 997 callout_schedule(&cfg->periodic, hz * PERIODIC_DELAY); 998 CURVNET_RESTORE(); 999 } 1000 1001 #define ALLOC_ERROR(stage, type) ((stage) ? 10 * (type) + (stage): 0) 1002 #define HOST_ERROR(stage) ALLOC_ERROR(stage, 1) 1003 #define PG_ERROR(stage) ALLOC_ERROR(stage, 2) 1004 static int 1005 nat64lsn_alloc_host(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji) 1006 { 1007 char a[INET6_ADDRSTRLEN]; 1008 struct nat64lsn_aliaslink *link; 1009 struct nat64lsn_host *host; 1010 struct nat64lsn_state *state; 1011 uint32_t hval, data[2]; 1012 int i; 1013 1014 /* Check that host was not yet added. */ 1015 NAT64LSN_EPOCH_ASSERT(); 1016 CK_SLIST_FOREACH(host, &HOSTS(cfg, ji->src6_hval), entries) { 1017 if (IN6_ARE_ADDR_EQUAL(&ji->f_id.src_ip6, &host->addr)) { 1018 /* The host was allocated in previous call. */ 1019 ji->host = host; 1020 goto get_state; 1021 } 1022 } 1023 1024 host = ji->host = uma_zalloc(nat64lsn_host_zone, M_NOWAIT); 1025 if (ji->host == NULL) 1026 return (HOST_ERROR(1)); 1027 1028 host->states_hashsize = NAT64LSN_HSIZE; 1029 host->states_hash = malloc(sizeof(struct nat64lsn_states_slist) * 1030 host->states_hashsize, M_NAT64LSN, M_NOWAIT); 1031 if (host->states_hash == NULL) { 1032 uma_zfree(nat64lsn_host_zone, host); 1033 return (HOST_ERROR(2)); 1034 } 1035 1036 link = uma_zalloc(nat64lsn_aliaslink_zone, M_NOWAIT); 1037 if (link == NULL) { 1038 free(host->states_hash, M_NAT64LSN); 1039 uma_zfree(nat64lsn_host_zone, host); 1040 return (HOST_ERROR(3)); 1041 } 1042 1043 /* Initialize */ 1044 HOST_LOCK_INIT(host); 1045 SET_AGE(host->timestamp); 1046 host->addr = ji->f_id.src_ip6; 1047 host->hval = ji->src6_hval; 1048 host->flags = 0; 1049 host->states_count = 0; 1050 host->states_hashsize = NAT64LSN_HSIZE; 1051 CK_SLIST_INIT(&host->aliases); 1052 for (i = 0; i < host->states_hashsize; i++) 1053 CK_SLIST_INIT(&host->states_hash[i]); 1054 1055 /* Determine alias from flow hash. */ 1056 hval = ALIASLINK_HVAL(cfg, &ji->f_id); 1057 link->alias = &ALIAS_BYHASH(cfg, hval); 1058 CK_SLIST_INSERT_HEAD(&host->aliases, link, host_entries); 1059 1060 ALIAS_LOCK(link->alias); 1061 CK_SLIST_INSERT_HEAD(&link->alias->hosts, link, alias_entries); 1062 link->alias->hosts_count++; 1063 ALIAS_UNLOCK(link->alias); 1064 1065 CFG_LOCK(cfg); 1066 CK_SLIST_INSERT_HEAD(&HOSTS(cfg, ji->src6_hval), host, entries); 1067 cfg->hosts_count++; 1068 CFG_UNLOCK(cfg); 1069 1070 get_state: 1071 data[0] = ji->faddr; 1072 data[1] = (ji->f_id.dst_port << 16) | ji->port; 1073 ji->state_hval = hval = STATE_HVAL(cfg, data); 1074 state = nat64lsn_get_state6to4(cfg, host, &ji->f_id, hval, 1075 ji->faddr, ji->port, ji->proto); 1076 /* 1077 * We failed to obtain new state, used alias needs new PG. 1078 * XXX: or another alias should be used. 1079 */ 1080 if (state == NULL) { 1081 /* Try to allocate new PG */ 1082 if (nat64lsn_alloc_pg(cfg, ji) != PG_ERROR(0)) 1083 return (HOST_ERROR(4)); 1084 /* We assume that nat64lsn_alloc_pg() got state */ 1085 } else 1086 ji->state = state; 1087 1088 ji->done = 1; 1089 DPRINTF(DP_OBJ, "ALLOC HOST %s %p", 1090 inet_ntop(AF_INET6, &host->addr, a, sizeof(a)), host); 1091 return (HOST_ERROR(0)); 1092 } 1093 1094 static int 1095 nat64lsn_find_pg_place(uint32_t *data) 1096 { 1097 int i; 1098 1099 for (i = 0; i < 32; i++) { 1100 if (~data[i] == 0) 1101 continue; 1102 return (i * 32 + ffs(~data[i]) - 1); 1103 } 1104 return (-1); 1105 } 1106 1107 static int 1108 nat64lsn_alloc_proto_pg(struct nat64lsn_cfg *cfg, 1109 struct nat64lsn_alias *alias, uint32_t *chunkmask, 1110 uint32_t *pgmask, struct nat64lsn_pgchunk **chunks, 1111 struct nat64lsn_pg **pgptr, uint8_t proto) 1112 { 1113 struct nat64lsn_pg *pg; 1114 int i, pg_idx, chunk_idx; 1115 1116 /* Find place in pgchunk where PG can be added */ 1117 pg_idx = nat64lsn_find_pg_place(pgmask); 1118 if (pg_idx < 0) /* no more PGs */ 1119 return (PG_ERROR(1)); 1120 /* Check that we have allocated pgchunk for given PG index */ 1121 chunk_idx = pg_idx / 32; 1122 if (!ISSET32(*chunkmask, chunk_idx)) { 1123 chunks[chunk_idx] = uma_zalloc(nat64lsn_pgchunk_zone, 1124 M_NOWAIT); 1125 if (chunks[chunk_idx] == NULL) 1126 return (PG_ERROR(2)); 1127 ck_pr_bts_32(chunkmask, chunk_idx); 1128 ck_pr_fence_store(); 1129 } 1130 /* Allocate PG and states chunks */ 1131 pg = uma_zalloc(nat64lsn_pg_zone, M_NOWAIT); 1132 if (pg == NULL) 1133 return (PG_ERROR(3)); 1134 pg->chunks_count = cfg->states_chunks; 1135 if (pg->chunks_count > 1) { 1136 pg->freemask_chunk = malloc(pg->chunks_count * 1137 sizeof(uint64_t), M_NAT64LSN, M_NOWAIT); 1138 if (pg->freemask_chunk == NULL) { 1139 uma_zfree(nat64lsn_pg_zone, pg); 1140 return (PG_ERROR(4)); 1141 } 1142 pg->states_chunk = malloc(pg->chunks_count * 1143 sizeof(struct nat64lsn_states_chunk *), M_NAT64LSN, 1144 M_NOWAIT | M_ZERO); 1145 if (pg->states_chunk == NULL) { 1146 free(pg->freemask_chunk, M_NAT64LSN); 1147 uma_zfree(nat64lsn_pg_zone, pg); 1148 return (PG_ERROR(5)); 1149 } 1150 for (i = 0; i < pg->chunks_count; i++) { 1151 pg->states_chunk[i] = uma_zalloc( 1152 nat64lsn_state_zone, M_NOWAIT); 1153 if (pg->states_chunk[i] == NULL) 1154 goto states_failed; 1155 } 1156 memset(pg->freemask_chunk, 0xff, 1157 sizeof(uint64_t) * pg->chunks_count); 1158 } else { 1159 pg->states = uma_zalloc(nat64lsn_state_zone, M_NOWAIT); 1160 if (pg->states == NULL) { 1161 uma_zfree(nat64lsn_pg_zone, pg); 1162 return (PG_ERROR(6)); 1163 } 1164 memset(&pg->freemask64, 0xff, sizeof(uint64_t)); 1165 } 1166 1167 /* Initialize PG and hook it to pgchunk */ 1168 SET_AGE(pg->timestamp); 1169 pg->proto = proto; 1170 pg->base_port = NAT64_MIN_PORT + 64 * pg_idx; 1171 ck_pr_store_ptr(&chunks[chunk_idx]->pgptr[pg_idx % 32], pg); 1172 ck_pr_fence_store(); 1173 ck_pr_bts_32(&pgmask[pg_idx / 32], pg_idx % 32); 1174 ck_pr_store_ptr(pgptr, pg); 1175 1176 ALIAS_LOCK(alias); 1177 CK_SLIST_INSERT_HEAD(&alias->portgroups, pg, entries); 1178 SET_AGE(alias->timestamp); 1179 alias->portgroups_count++; 1180 ALIAS_UNLOCK(alias); 1181 NAT64STAT_INC(&cfg->base.stats, spgcreated); 1182 return (PG_ERROR(0)); 1183 1184 states_failed: 1185 for (i = 0; i < pg->chunks_count; i++) 1186 uma_zfree(nat64lsn_state_zone, pg->states_chunk[i]); 1187 free(pg->freemask_chunk, M_NAT64LSN); 1188 free(pg->states_chunk, M_NAT64LSN); 1189 uma_zfree(nat64lsn_pg_zone, pg); 1190 return (PG_ERROR(7)); 1191 } 1192 1193 static int 1194 nat64lsn_alloc_pg(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji) 1195 { 1196 struct nat64lsn_aliaslink *link; 1197 struct nat64lsn_alias *alias; 1198 int ret; 1199 1200 link = nat64lsn_get_aliaslink(cfg, ji->host, &ji->f_id); 1201 if (link == NULL) 1202 return (PG_ERROR(1)); 1203 1204 /* 1205 * TODO: check that we did not already allocated PG in 1206 * previous call. 1207 */ 1208 1209 ret = 0; 1210 alias = link->alias; 1211 /* Find place in pgchunk where PG can be added */ 1212 switch (ji->proto) { 1213 case IPPROTO_TCP: 1214 ret = nat64lsn_alloc_proto_pg(cfg, alias, 1215 &alias->tcp_chunkmask, alias->tcp_pgmask, 1216 alias->tcp, &alias->tcp_pg, ji->proto); 1217 break; 1218 case IPPROTO_UDP: 1219 ret = nat64lsn_alloc_proto_pg(cfg, alias, 1220 &alias->udp_chunkmask, alias->udp_pgmask, 1221 alias->udp, &alias->udp_pg, ji->proto); 1222 break; 1223 case IPPROTO_ICMP: 1224 ret = nat64lsn_alloc_proto_pg(cfg, alias, 1225 &alias->icmp_chunkmask, alias->icmp_pgmask, 1226 alias->icmp, &alias->icmp_pg, ji->proto); 1227 break; 1228 default: 1229 panic("%s: wrong proto %d", __func__, ji->proto); 1230 } 1231 if (ret == PG_ERROR(1)) { 1232 /* 1233 * PG_ERROR(1) means that alias lacks free PGs 1234 * XXX: try next alias. 1235 */ 1236 printf("NAT64LSN: %s: failed to obtain PG\n", 1237 __func__); 1238 return (ret); 1239 } 1240 if (ret == PG_ERROR(0)) { 1241 ji->state = nat64lsn_get_state6to4(cfg, ji->host, &ji->f_id, 1242 ji->state_hval, ji->faddr, ji->port, ji->proto); 1243 if (ji->state == NULL) 1244 ret = PG_ERROR(8); 1245 else 1246 ji->done = 1; 1247 } 1248 return (ret); 1249 } 1250 1251 static void 1252 nat64lsn_do_request(void *data) 1253 { 1254 struct epoch_tracker et; 1255 struct nat64lsn_job_head jhead; 1256 struct nat64lsn_job_item *ji, *ji2; 1257 struct nat64lsn_cfg *cfg; 1258 int jcount; 1259 uint8_t flags; 1260 1261 cfg = (struct nat64lsn_cfg *)data; 1262 if (cfg->jlen == 0) 1263 return; 1264 1265 CURVNET_SET(cfg->vp); 1266 STAILQ_INIT(&jhead); 1267 1268 /* Grab queue */ 1269 JQUEUE_LOCK(); 1270 STAILQ_SWAP(&jhead, &cfg->jhead, nat64lsn_job_item); 1271 jcount = cfg->jlen; 1272 cfg->jlen = 0; 1273 JQUEUE_UNLOCK(); 1274 1275 /* TODO: check if we need to resize hash */ 1276 1277 NAT64STAT_INC(&cfg->base.stats, jcalls); 1278 DPRINTF(DP_JQUEUE, "count=%d", jcount); 1279 1280 /* 1281 * TODO: 1282 * What we should do here is to build a hash 1283 * to ensure we don't have lots of duplicate requests. 1284 * Skip this for now. 1285 * 1286 * TODO: Limit per-call number of items 1287 */ 1288 1289 NAT64LSN_EPOCH_ENTER(et); 1290 STAILQ_FOREACH(ji, &jhead, entries) { 1291 switch (ji->jtype) { 1292 case JTYPE_NEWHOST: 1293 if (nat64lsn_alloc_host(cfg, ji) != HOST_ERROR(0)) 1294 NAT64STAT_INC(&cfg->base.stats, jhostfails); 1295 break; 1296 case JTYPE_NEWPORTGROUP: 1297 if (nat64lsn_alloc_pg(cfg, ji) != PG_ERROR(0)) 1298 NAT64STAT_INC(&cfg->base.stats, jportfails); 1299 break; 1300 default: 1301 continue; 1302 } 1303 if (ji->done != 0) { 1304 flags = ji->proto != IPPROTO_TCP ? 0 : 1305 convert_tcp_flags(ji->f_id._flags); 1306 nat64lsn_translate6_internal(cfg, &ji->m, 1307 ji->state, flags); 1308 NAT64STAT_INC(&cfg->base.stats, jreinjected); 1309 } 1310 } 1311 NAT64LSN_EPOCH_EXIT(et); 1312 1313 ji = STAILQ_FIRST(&jhead); 1314 while (ji != NULL) { 1315 ji2 = STAILQ_NEXT(ji, entries); 1316 /* 1317 * In any case we must free mbuf if 1318 * translator did not consumed it. 1319 */ 1320 m_freem(ji->m); 1321 uma_zfree(nat64lsn_job_zone, ji); 1322 ji = ji2; 1323 } 1324 CURVNET_RESTORE(); 1325 } 1326 1327 static struct nat64lsn_job_item * 1328 nat64lsn_create_job(struct nat64lsn_cfg *cfg, int jtype) 1329 { 1330 struct nat64lsn_job_item *ji; 1331 1332 /* 1333 * Do not try to lock possibly contested mutex if we're near the 1334 * limit. Drop packet instead. 1335 */ 1336 ji = NULL; 1337 if (cfg->jlen >= cfg->jmaxlen) 1338 NAT64STAT_INC(&cfg->base.stats, jmaxlen); 1339 else { 1340 ji = uma_zalloc(nat64lsn_job_zone, M_NOWAIT); 1341 if (ji == NULL) 1342 NAT64STAT_INC(&cfg->base.stats, jnomem); 1343 } 1344 if (ji == NULL) { 1345 NAT64STAT_INC(&cfg->base.stats, dropped); 1346 DPRINTF(DP_DROPS, "failed to create job"); 1347 } else { 1348 ji->jtype = jtype; 1349 ji->done = 0; 1350 } 1351 return (ji); 1352 } 1353 1354 static void 1355 nat64lsn_enqueue_job(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji) 1356 { 1357 1358 JQUEUE_LOCK(); 1359 STAILQ_INSERT_TAIL(&cfg->jhead, ji, entries); 1360 NAT64STAT_INC(&cfg->base.stats, jrequests); 1361 cfg->jlen++; 1362 1363 if (callout_pending(&cfg->jcallout) == 0) 1364 callout_reset(&cfg->jcallout, 1, nat64lsn_do_request, cfg); 1365 JQUEUE_UNLOCK(); 1366 } 1367 1368 static void 1369 nat64lsn_job_destroy(epoch_context_t ctx) 1370 { 1371 struct nat64lsn_job_item *ji; 1372 struct nat64lsn_host *host; 1373 struct nat64lsn_pg *pg; 1374 int i; 1375 1376 ji = __containerof(ctx, struct nat64lsn_job_item, epoch_ctx); 1377 MPASS(ji->jtype == JTYPE_DESTROY); 1378 while (!CK_SLIST_EMPTY(&ji->hosts)) { 1379 host = CK_SLIST_FIRST(&ji->hosts); 1380 CK_SLIST_REMOVE_HEAD(&ji->hosts, entries); 1381 if (host->states_count > 0) { 1382 /* 1383 * XXX: The state has been created 1384 * during host deletion. 1385 */ 1386 printf("NAT64LSN: %s: destroying host with %d " 1387 "states\n", __func__, host->states_count); 1388 } 1389 nat64lsn_destroy_host(host); 1390 } 1391 while (!CK_SLIST_EMPTY(&ji->portgroups)) { 1392 pg = CK_SLIST_FIRST(&ji->portgroups); 1393 CK_SLIST_REMOVE_HEAD(&ji->portgroups, entries); 1394 for (i = 0; i < pg->chunks_count; i++) { 1395 if (FREEMASK_BITCOUNT(pg, i) != 64) { 1396 /* 1397 * XXX: The state has been created during 1398 * PG deletion. 1399 */ 1400 printf("NAT64LSN: %s: destroying PG %p " 1401 "with non-empty chunk %d\n", __func__, 1402 pg, i); 1403 } 1404 } 1405 nat64lsn_destroy_pg(pg); 1406 } 1407 uma_zfree(nat64lsn_pgchunk_zone, ji->pgchunk); 1408 uma_zfree(nat64lsn_job_zone, ji); 1409 } 1410 1411 static int 1412 nat64lsn_request_host(struct nat64lsn_cfg *cfg, 1413 const struct ipfw_flow_id *f_id, struct mbuf **mp, uint32_t hval, 1414 in_addr_t faddr, uint16_t port, uint8_t proto) 1415 { 1416 struct nat64lsn_job_item *ji; 1417 1418 ji = nat64lsn_create_job(cfg, JTYPE_NEWHOST); 1419 if (ji != NULL) { 1420 ji->m = *mp; 1421 ji->f_id = *f_id; 1422 ji->faddr = faddr; 1423 ji->port = port; 1424 ji->proto = proto; 1425 ji->src6_hval = hval; 1426 1427 nat64lsn_enqueue_job(cfg, ji); 1428 NAT64STAT_INC(&cfg->base.stats, jhostsreq); 1429 *mp = NULL; 1430 } 1431 return (IP_FW_DENY); 1432 } 1433 1434 static int 1435 nat64lsn_request_pg(struct nat64lsn_cfg *cfg, struct nat64lsn_host *host, 1436 const struct ipfw_flow_id *f_id, struct mbuf **mp, uint32_t hval, 1437 in_addr_t faddr, uint16_t port, uint8_t proto) 1438 { 1439 struct nat64lsn_job_item *ji; 1440 1441 ji = nat64lsn_create_job(cfg, JTYPE_NEWPORTGROUP); 1442 if (ji != NULL) { 1443 ji->m = *mp; 1444 ji->f_id = *f_id; 1445 ji->faddr = faddr; 1446 ji->port = port; 1447 ji->proto = proto; 1448 ji->state_hval = hval; 1449 ji->host = host; 1450 1451 nat64lsn_enqueue_job(cfg, ji); 1452 NAT64STAT_INC(&cfg->base.stats, jportreq); 1453 *mp = NULL; 1454 } 1455 return (IP_FW_DENY); 1456 } 1457 1458 static int 1459 nat64lsn_translate6_internal(struct nat64lsn_cfg *cfg, struct mbuf **mp, 1460 struct nat64lsn_state *state, uint8_t flags) 1461 { 1462 struct pfloghdr loghdr, *logdata; 1463 int ret; 1464 uint16_t ts; 1465 1466 /* Update timestamp and flags if needed */ 1467 SET_AGE(ts); 1468 if (state->timestamp != ts) 1469 state->timestamp = ts; 1470 if ((state->flags & flags) != 0) 1471 state->flags |= flags; 1472 1473 if (cfg->base.flags & NAT64_LOG) { 1474 logdata = &loghdr; 1475 nat64lsn_log(logdata, *mp, AF_INET6, state); 1476 } else 1477 logdata = NULL; 1478 1479 ret = nat64_do_handle_ip6(*mp, htonl(state->ip_src), 1480 htons(state->aport), &cfg->base, logdata); 1481 if (ret == NAT64SKIP) 1482 return (cfg->nomatch_verdict); 1483 if (ret == NAT64RETURN) 1484 *mp = NULL; 1485 return (IP_FW_DENY); 1486 } 1487 1488 static int 1489 nat64lsn_translate6(struct nat64lsn_cfg *cfg, struct ipfw_flow_id *f_id, 1490 struct mbuf **mp) 1491 { 1492 struct nat64lsn_state *state; 1493 struct nat64lsn_host *host; 1494 struct icmp6_hdr *icmp6; 1495 uint32_t addr, hval, data[2]; 1496 int offset, proto; 1497 uint16_t port; 1498 uint8_t flags; 1499 1500 /* Check if protocol is supported */ 1501 port = f_id->src_port; 1502 proto = f_id->proto; 1503 switch (f_id->proto) { 1504 case IPPROTO_ICMPV6: 1505 /* 1506 * For ICMPv6 echo reply/request we use icmp6_id as 1507 * local port. 1508 */ 1509 offset = 0; 1510 proto = nat64_getlasthdr(*mp, &offset); 1511 if (proto < 0) { 1512 NAT64STAT_INC(&cfg->base.stats, dropped); 1513 DPRINTF(DP_DROPS, "mbuf isn't contigious"); 1514 return (IP_FW_DENY); 1515 } 1516 if (proto == IPPROTO_ICMPV6) { 1517 icmp6 = mtodo(*mp, offset); 1518 if (icmp6->icmp6_type == ICMP6_ECHO_REQUEST || 1519 icmp6->icmp6_type == ICMP6_ECHO_REPLY) 1520 port = ntohs(icmp6->icmp6_id); 1521 } 1522 proto = IPPROTO_ICMP; 1523 /* FALLTHROUGH */ 1524 case IPPROTO_TCP: 1525 case IPPROTO_UDP: 1526 break; 1527 default: 1528 NAT64STAT_INC(&cfg->base.stats, noproto); 1529 return (cfg->nomatch_verdict); 1530 } 1531 1532 /* Extract IPv4 from destination IPv6 address */ 1533 addr = nat64_extract_ip4(&f_id->dst_ip6, cfg->base.plat_plen); 1534 if (addr == 0 || nat64_check_private_ip4(&cfg->base, addr) != 0) { 1535 char a[INET_ADDRSTRLEN]; 1536 1537 NAT64STAT_INC(&cfg->base.stats, dropped); 1538 DPRINTF(DP_DROPS, "dropped due to embedded IPv4 address %s", 1539 inet_ntop(AF_INET, &addr, a, sizeof(a))); 1540 return (IP_FW_DENY); /* XXX: add extra stats? */ 1541 } 1542 1543 /* Try to find host */ 1544 hval = HOST_HVAL(cfg, &f_id->src_ip6); 1545 CK_SLIST_FOREACH(host, &HOSTS(cfg, hval), entries) { 1546 if (IN6_ARE_ADDR_EQUAL(&f_id->src_ip6, &host->addr)) 1547 break; 1548 } 1549 /* We use IPv4 address in host byte order */ 1550 addr = ntohl(addr); 1551 if (host == NULL) 1552 return (nat64lsn_request_host(cfg, f_id, mp, 1553 hval, addr, port, proto)); 1554 1555 flags = proto != IPPROTO_TCP ? 0 : convert_tcp_flags(f_id->_flags); 1556 1557 data[0] = addr; 1558 data[1] = (f_id->dst_port << 16) | port; 1559 hval = STATE_HVAL(cfg, data); 1560 state = nat64lsn_get_state6to4(cfg, host, f_id, hval, addr, 1561 port, proto); 1562 if (state == NULL) 1563 return (nat64lsn_request_pg(cfg, host, f_id, mp, hval, addr, 1564 port, proto)); 1565 return (nat64lsn_translate6_internal(cfg, mp, state, flags)); 1566 } 1567 1568 /* 1569 * Main dataplane entry point. 1570 */ 1571 int 1572 ipfw_nat64lsn(struct ip_fw_chain *ch, struct ip_fw_args *args, 1573 ipfw_insn *cmd, int *done) 1574 { 1575 struct nat64lsn_cfg *cfg; 1576 ipfw_insn *icmd; 1577 int ret; 1578 1579 IPFW_RLOCK_ASSERT(ch); 1580 1581 *done = 0; /* continue the search in case of failure */ 1582 icmd = cmd + 1; 1583 if (cmd->opcode != O_EXTERNAL_ACTION || 1584 cmd->arg1 != V_nat64lsn_eid || 1585 icmd->opcode != O_EXTERNAL_INSTANCE || 1586 (cfg = NAT64_LOOKUP(ch, icmd)) == NULL) 1587 return (IP_FW_DENY); 1588 1589 *done = 1; /* terminate the search */ 1590 1591 switch (args->f_id.addr_type) { 1592 case 4: 1593 ret = nat64lsn_translate4(cfg, &args->f_id, &args->m); 1594 break; 1595 case 6: 1596 /* 1597 * Check that destination IPv6 address matches our prefix6. 1598 */ 1599 if ((cfg->base.flags & NAT64LSN_ANYPREFIX) == 0 && 1600 memcmp(&args->f_id.dst_ip6, &cfg->base.plat_prefix, 1601 cfg->base.plat_plen / 8) != 0) { 1602 ret = cfg->nomatch_verdict; 1603 break; 1604 } 1605 ret = nat64lsn_translate6(cfg, &args->f_id, &args->m); 1606 break; 1607 default: 1608 ret = cfg->nomatch_verdict; 1609 } 1610 1611 if (ret != IP_FW_PASS && args->m != NULL) { 1612 m_freem(args->m); 1613 args->m = NULL; 1614 } 1615 return (ret); 1616 } 1617 1618 static int 1619 nat64lsn_state_ctor(void *mem, int size, void *arg, int flags) 1620 { 1621 struct nat64lsn_states_chunk *chunk; 1622 int i; 1623 1624 chunk = (struct nat64lsn_states_chunk *)mem; 1625 for (i = 0; i < 64; i++) 1626 chunk->state[i].flags = 0; 1627 return (0); 1628 } 1629 1630 void 1631 nat64lsn_init_internal(void) 1632 { 1633 1634 nat64lsn_host_zone = uma_zcreate("NAT64LSN hosts", 1635 sizeof(struct nat64lsn_host), NULL, NULL, NULL, NULL, 1636 UMA_ALIGN_PTR, 0); 1637 nat64lsn_pgchunk_zone = uma_zcreate("NAT64LSN portgroup chunks", 1638 sizeof(struct nat64lsn_pgchunk), NULL, NULL, NULL, NULL, 1639 UMA_ALIGN_PTR, 0); 1640 nat64lsn_pg_zone = uma_zcreate("NAT64LSN portgroups", 1641 sizeof(struct nat64lsn_pg), NULL, NULL, NULL, NULL, 1642 UMA_ALIGN_PTR, 0); 1643 nat64lsn_aliaslink_zone = uma_zcreate("NAT64LSN links", 1644 sizeof(struct nat64lsn_aliaslink), NULL, NULL, NULL, NULL, 1645 UMA_ALIGN_PTR, 0); 1646 nat64lsn_state_zone = uma_zcreate("NAT64LSN states", 1647 sizeof(struct nat64lsn_states_chunk), nat64lsn_state_ctor, 1648 NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 1649 nat64lsn_job_zone = uma_zcreate("NAT64LSN jobs", 1650 sizeof(struct nat64lsn_job_item), NULL, NULL, NULL, NULL, 1651 UMA_ALIGN_PTR, 0); 1652 JQUEUE_LOCK_INIT(); 1653 } 1654 1655 void 1656 nat64lsn_uninit_internal(void) 1657 { 1658 1659 /* XXX: epoch_task drain */ 1660 JQUEUE_LOCK_DESTROY(); 1661 uma_zdestroy(nat64lsn_host_zone); 1662 uma_zdestroy(nat64lsn_pgchunk_zone); 1663 uma_zdestroy(nat64lsn_pg_zone); 1664 uma_zdestroy(nat64lsn_aliaslink_zone); 1665 uma_zdestroy(nat64lsn_state_zone); 1666 uma_zdestroy(nat64lsn_job_zone); 1667 } 1668 1669 void 1670 nat64lsn_start_instance(struct nat64lsn_cfg *cfg) 1671 { 1672 1673 CALLOUT_LOCK(cfg); 1674 callout_reset(&cfg->periodic, hz * PERIODIC_DELAY, 1675 nat64lsn_periodic, cfg); 1676 CALLOUT_UNLOCK(cfg); 1677 } 1678 1679 struct nat64lsn_cfg * 1680 nat64lsn_init_instance(struct ip_fw_chain *ch, in_addr_t prefix, int plen) 1681 { 1682 struct nat64lsn_cfg *cfg; 1683 struct nat64lsn_alias *alias; 1684 int i, naddr; 1685 1686 cfg = malloc(sizeof(struct nat64lsn_cfg), M_NAT64LSN, 1687 M_WAITOK | M_ZERO); 1688 1689 CFG_LOCK_INIT(cfg); 1690 CALLOUT_LOCK_INIT(cfg); 1691 STAILQ_INIT(&cfg->jhead); 1692 cfg->vp = curvnet; 1693 COUNTER_ARRAY_ALLOC(cfg->base.stats.cnt, NAT64STATS, M_WAITOK); 1694 1695 cfg->hash_seed = arc4random(); 1696 cfg->hosts_hashsize = NAT64LSN_HOSTS_HSIZE; 1697 cfg->hosts_hash = malloc(sizeof(struct nat64lsn_hosts_slist) * 1698 cfg->hosts_hashsize, M_NAT64LSN, M_WAITOK | M_ZERO); 1699 for (i = 0; i < cfg->hosts_hashsize; i++) 1700 CK_SLIST_INIT(&cfg->hosts_hash[i]); 1701 1702 naddr = 1 << (32 - plen); 1703 cfg->prefix4 = prefix; 1704 cfg->pmask4 = prefix | (naddr - 1); 1705 cfg->plen4 = plen; 1706 cfg->aliases = malloc(sizeof(struct nat64lsn_alias) * naddr, 1707 M_NAT64LSN, M_WAITOK | M_ZERO); 1708 for (i = 0; i < naddr; i++) { 1709 alias = &cfg->aliases[i]; 1710 alias->addr = prefix + i; /* host byte order */ 1711 CK_SLIST_INIT(&alias->hosts); 1712 ALIAS_LOCK_INIT(alias); 1713 } 1714 1715 callout_init_mtx(&cfg->periodic, &cfg->periodic_lock, 0); 1716 callout_init(&cfg->jcallout, CALLOUT_MPSAFE); 1717 1718 return (cfg); 1719 } 1720 1721 static void 1722 nat64lsn_destroy_pg(struct nat64lsn_pg *pg) 1723 { 1724 int i; 1725 1726 if (pg->chunks_count == 1) { 1727 uma_zfree(nat64lsn_state_zone, pg->states); 1728 } else { 1729 for (i = 0; i < pg->chunks_count; i++) 1730 uma_zfree(nat64lsn_state_zone, pg->states_chunk[i]); 1731 free(pg->states_chunk, M_NAT64LSN); 1732 free(pg->freemask_chunk, M_NAT64LSN); 1733 } 1734 uma_zfree(nat64lsn_pg_zone, pg); 1735 } 1736 1737 static void 1738 nat64lsn_destroy_alias(struct nat64lsn_cfg *cfg, 1739 struct nat64lsn_alias *alias) 1740 { 1741 struct nat64lsn_pg *pg; 1742 int i; 1743 1744 while (!CK_SLIST_EMPTY(&alias->portgroups)) { 1745 pg = CK_SLIST_FIRST(&alias->portgroups); 1746 CK_SLIST_REMOVE_HEAD(&alias->portgroups, entries); 1747 nat64lsn_destroy_pg(pg); 1748 } 1749 for (i = 0; i < 32; i++) { 1750 if (ISSET32(alias->tcp_chunkmask, i)) 1751 uma_zfree(nat64lsn_pgchunk_zone, alias->tcp[i]); 1752 if (ISSET32(alias->udp_chunkmask, i)) 1753 uma_zfree(nat64lsn_pgchunk_zone, alias->udp[i]); 1754 if (ISSET32(alias->icmp_chunkmask, i)) 1755 uma_zfree(nat64lsn_pgchunk_zone, alias->icmp[i]); 1756 } 1757 ALIAS_LOCK_DESTROY(alias); 1758 } 1759 1760 static void 1761 nat64lsn_destroy_host(struct nat64lsn_host *host) 1762 { 1763 struct nat64lsn_aliaslink *link; 1764 1765 while (!CK_SLIST_EMPTY(&host->aliases)) { 1766 link = CK_SLIST_FIRST(&host->aliases); 1767 CK_SLIST_REMOVE_HEAD(&host->aliases, host_entries); 1768 1769 ALIAS_LOCK(link->alias); 1770 CK_SLIST_REMOVE(&link->alias->hosts, link, 1771 nat64lsn_aliaslink, alias_entries); 1772 link->alias->hosts_count--; 1773 ALIAS_UNLOCK(link->alias); 1774 1775 uma_zfree(nat64lsn_aliaslink_zone, link); 1776 } 1777 HOST_LOCK_DESTROY(host); 1778 free(host->states_hash, M_NAT64LSN); 1779 uma_zfree(nat64lsn_host_zone, host); 1780 } 1781 1782 void 1783 nat64lsn_destroy_instance(struct nat64lsn_cfg *cfg) 1784 { 1785 struct nat64lsn_host *host; 1786 int i; 1787 1788 CALLOUT_LOCK(cfg); 1789 callout_drain(&cfg->periodic); 1790 CALLOUT_UNLOCK(cfg); 1791 callout_drain(&cfg->jcallout); 1792 1793 for (i = 0; i < cfg->hosts_hashsize; i++) { 1794 while (!CK_SLIST_EMPTY(&cfg->hosts_hash[i])) { 1795 host = CK_SLIST_FIRST(&cfg->hosts_hash[i]); 1796 CK_SLIST_REMOVE_HEAD(&cfg->hosts_hash[i], entries); 1797 nat64lsn_destroy_host(host); 1798 } 1799 } 1800 1801 for (i = 0; i < (1 << (32 - cfg->plen4)); i++) 1802 nat64lsn_destroy_alias(cfg, &cfg->aliases[i]); 1803 1804 CALLOUT_LOCK_DESTROY(cfg); 1805 CFG_LOCK_DESTROY(cfg); 1806 COUNTER_ARRAY_FREE(cfg->base.stats.cnt, NAT64STATS); 1807 free(cfg->hosts_hash, M_NAT64LSN); 1808 free(cfg->aliases, M_NAT64LSN); 1809 free(cfg, M_NAT64LSN); 1810 }
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