1 /*- 2 * Copyright (c) 2015-2016 Yandex LLC 3 * Copyright (c) 2015 Alexander V. Chernikov <melifaro@FreeBSD.org> 4 * Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/counter.h> 35 #include <sys/errno.h> 36 #include <sys/kernel.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/mbuf.h> 40 #include <sys/module.h> 41 #include <sys/rmlock.h> 42 #include <sys/rwlock.h> 43 #include <sys/socket.h> 44 #include <sys/queue.h> 45 #include <sys/syslog.h> 46 #include <sys/sysctl.h> 47 48 #include <net/if.h> 49 #include <net/if_var.h> 50 #include <net/if_pflog.h> 51 #include <net/pfil.h> 52 53 #include <netinet/in.h> 54 #include <netinet/ip.h> 55 #include <netinet/ip_var.h> 56 #include <netinet/ip_fw.h> 57 #include <netinet/ip6.h> 58 #include <netinet/icmp6.h> 59 #include <netinet/ip_icmp.h> 60 #include <netinet/tcp.h> 61 #include <netinet/udp.h> 62 #include <netinet6/in6_var.h> 63 #include <netinet6/ip6_var.h> 64 #include <netinet6/ip_fw_nat64.h> 65 66 #include <netpfil/ipfw/ip_fw_private.h> 67 #include <netpfil/ipfw/nat64/ip_fw_nat64.h> 68 #include <netpfil/ipfw/nat64/nat64lsn.h> 69 #include <netpfil/ipfw/nat64/nat64_translate.h> 70 #include <netpfil/pf/pf.h> 71 72 MALLOC_DEFINE(M_NAT64LSN, "NAT64LSN", "NAT64LSN"); 73 74 static void nat64lsn_periodic(void *data); 75 #define PERIODIC_DELAY 4 76 static uint8_t nat64lsn_proto_map[256]; 77 uint8_t nat64lsn_rproto_map[NAT_MAX_PROTO]; 78 79 #define NAT64_FLAG_FIN 0x01 /* FIN was seen */ 80 #define NAT64_FLAG_SYN 0x02 /* First syn in->out */ 81 #define NAT64_FLAG_ESTAB 0x04 /* Packet with Ack */ 82 #define NAT64_FLAGS_TCP (NAT64_FLAG_SYN|NAT64_FLAG_ESTAB|NAT64_FLAG_FIN) 83 84 #define NAT64_FLAG_RDR 0x80 /* Port redirect */ 85 #define NAT64_LOOKUP(chain, cmd) \ 86 (struct nat64lsn_cfg *)SRV_OBJECT((chain), (cmd)->arg1) 87 /* 88 * Delayed job queue, used to create new hosts 89 * and new portgroups 90 */ 91 enum nat64lsn_jtype { 92 JTYPE_NEWHOST = 1, 93 JTYPE_NEWPORTGROUP, 94 JTYPE_DELPORTGROUP, 95 }; 96 97 struct nat64lsn_job_item { 98 TAILQ_ENTRY(nat64lsn_job_item) next; 99 enum nat64lsn_jtype jtype; 100 struct nat64lsn_host *nh; 101 struct nat64lsn_portgroup *pg; 102 void *spare_idx; 103 struct in6_addr haddr; 104 uint8_t nat_proto; 105 uint8_t done; 106 int needs_idx; 107 int delcount; 108 unsigned int fhash; /* Flow hash */ 109 uint32_t aaddr; /* Last used address (net) */ 110 struct mbuf *m; 111 struct ipfw_flow_id f_id; 112 uint64_t delmask[NAT64LSN_PGPTRNMASK]; 113 }; 114 115 static struct mtx jmtx; 116 #define JQUEUE_LOCK_INIT() mtx_init(&jmtx, "qlock", NULL, MTX_DEF) 117 #define JQUEUE_LOCK_DESTROY() mtx_destroy(&jmtx) 118 #define JQUEUE_LOCK() mtx_lock(&jmtx) 119 #define JQUEUE_UNLOCK() mtx_unlock(&jmtx) 120 121 static void nat64lsn_enqueue_job(struct nat64lsn_cfg *cfg, 122 struct nat64lsn_job_item *ji); 123 static void nat64lsn_enqueue_jobs(struct nat64lsn_cfg *cfg, 124 struct nat64lsn_job_head *jhead, int jlen); 125 126 static struct nat64lsn_job_item *nat64lsn_create_job(struct nat64lsn_cfg *cfg, 127 const struct ipfw_flow_id *f_id, int jtype); 128 static int nat64lsn_request_portgroup(struct nat64lsn_cfg *cfg, 129 const struct ipfw_flow_id *f_id, struct mbuf **pm, uint32_t aaddr, 130 int needs_idx); 131 static int nat64lsn_request_host(struct nat64lsn_cfg *cfg, 132 const struct ipfw_flow_id *f_id, struct mbuf **pm); 133 static int nat64lsn_translate4(struct nat64lsn_cfg *cfg, 134 const struct ipfw_flow_id *f_id, struct mbuf **pm); 135 static int nat64lsn_translate6(struct nat64lsn_cfg *cfg, 136 struct ipfw_flow_id *f_id, struct mbuf **pm); 137 138 static int alloc_portgroup(struct nat64lsn_job_item *ji); 139 static void destroy_portgroup(struct nat64lsn_portgroup *pg); 140 static void destroy_host6(struct nat64lsn_host *nh); 141 static int alloc_host6(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji); 142 143 static int attach_portgroup(struct nat64lsn_cfg *cfg, 144 struct nat64lsn_job_item *ji); 145 static int attach_host6(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji); 146 147 148 /* XXX tmp */ 149 static uma_zone_t nat64lsn_host_zone; 150 static uma_zone_t nat64lsn_pg_zone; 151 static uma_zone_t nat64lsn_pgidx_zone; 152 153 static unsigned int nat64lsn_periodic_chkstates(struct nat64lsn_cfg *cfg, 154 struct nat64lsn_host *nh); 155 156 #define I6_hash(x) (djb_hash((const unsigned char *)(x), 16)) 157 #define I6_first(_ph, h) (_ph)[h] 158 #define I6_next(x) (x)->next 159 #define I6_val(x) (&(x)->addr) 160 #define I6_cmp(a, b) IN6_ARE_ADDR_EQUAL(a, b) 161 #define I6_lock(a, b) 162 #define I6_unlock(a, b) 163 164 #define I6HASH_FIND(_cfg, _res, _a) \ 165 CHT_FIND(_cfg->ih, _cfg->ihsize, I6_, _res, _a) 166 #define I6HASH_INSERT(_cfg, _i) \ 167 CHT_INSERT_HEAD(_cfg->ih, _cfg->ihsize, I6_, _i) 168 #define I6HASH_REMOVE(_cfg, _res, _tmp, _a) \ 169 CHT_REMOVE(_cfg->ih, _cfg->ihsize, I6_, _res, _tmp, _a) 170 171 #define I6HASH_FOREACH_SAFE(_cfg, _x, _tmp, _cb, _arg) \ 172 CHT_FOREACH_SAFE(_cfg->ih, _cfg->ihsize, I6_, _x, _tmp, _cb, _arg) 173 174 #define HASH_IN4(x) djb_hash((const unsigned char *)(x), 8) 175 176 static unsigned 177 djb_hash(const unsigned char *h, const int len) 178 { 179 unsigned int result = 0; 180 int i; 181 182 for (i = 0; i < len; i++) 183 result = 33 * result ^ h[i]; 184 185 return (result); 186 } 187 188 /* 189 static size_t 190 bitmask_size(size_t num, int *level) 191 { 192 size_t x; 193 int c; 194 195 for (c = 0, x = num; num > 1; num /= 64, c++) 196 ; 197 198 return (x); 199 } 200 201 static void 202 bitmask_prepare(uint64_t *pmask, size_t bufsize, int level) 203 { 204 size_t x, z; 205 206 memset(pmask, 0xFF, bufsize); 207 for (x = 0, z = 1; level > 1; x += z, z *= 64, level--) 208 ; 209 pmask[x] ~= 0x01; 210 } 211 */ 212 213 static void 214 nat64lsn_log(struct pfloghdr *plog, struct mbuf *m, sa_family_t family, 215 uint32_t n, uint32_t sn) 216 { 217 218 memset(plog, 0, sizeof(*plog)); 219 plog->length = PFLOG_REAL_HDRLEN; 220 plog->af = family; 221 plog->action = PF_NAT; 222 plog->dir = PF_IN; 223 plog->rulenr = htonl(n); 224 plog->subrulenr = htonl(sn); 225 plog->ruleset[0] = '\0'; 226 strlcpy(plog->ifname, "NAT64LSN", sizeof(plog->ifname)); 227 ipfw_bpf_mtap2(plog, PFLOG_HDRLEN, m); 228 } 229 /* 230 * Inspects icmp packets to see if the message contains different 231 * packet header so we need to alter @addr and @port. 232 */ 233 static int 234 inspect_icmp_mbuf(struct mbuf **m, uint8_t *nat_proto, uint32_t *addr, 235 uint16_t *port) 236 { 237 struct ip *ip; 238 struct tcphdr *tcp; 239 struct udphdr *udp; 240 struct icmphdr *icmp; 241 int off; 242 uint8_t proto; 243 244 ip = mtod(*m, struct ip *); /* Outer IP header */ 245 off = (ip->ip_hl << 2) + ICMP_MINLEN; 246 if ((*m)->m_len < off) 247 *m = m_pullup(*m, off); 248 if (*m == NULL) 249 return (ENOMEM); 250 251 ip = mtod(*m, struct ip *); /* Outer IP header */ 252 icmp = L3HDR(ip, struct icmphdr *); 253 switch (icmp->icmp_type) { 254 case ICMP_ECHO: 255 case ICMP_ECHOREPLY: 256 /* Use icmp ID as distinguisher */ 257 *port = ntohs(*((uint16_t *)(icmp + 1))); 258 return (0); 259 case ICMP_UNREACH: 260 case ICMP_TIMXCEED: 261 break; 262 default: 263 return (EOPNOTSUPP); 264 } 265 /* 266 * ICMP_UNREACH and ICMP_TIMXCEED contains IP header + 64 bits 267 * of ULP header. 268 */ 269 if ((*m)->m_pkthdr.len < off + sizeof(struct ip) + ICMP_MINLEN) 270 return (EINVAL); 271 if ((*m)->m_len < off + sizeof(struct ip) + ICMP_MINLEN) 272 *m = m_pullup(*m, off + sizeof(struct ip) + ICMP_MINLEN); 273 if (*m == NULL) 274 return (ENOMEM); 275 ip = mtodo(*m, off); /* Inner IP header */ 276 proto = ip->ip_p; 277 off += ip->ip_hl << 2; /* Skip inner IP header */ 278 *addr = ntohl(ip->ip_src.s_addr); 279 if ((*m)->m_len < off + ICMP_MINLEN) 280 *m = m_pullup(*m, off + ICMP_MINLEN); 281 if (*m == NULL) 282 return (ENOMEM); 283 switch (proto) { 284 case IPPROTO_TCP: 285 tcp = mtodo(*m, off); 286 *nat_proto = NAT_PROTO_TCP; 287 *port = ntohs(tcp->th_sport); 288 return (0); 289 case IPPROTO_UDP: 290 udp = mtodo(*m, off); 291 *nat_proto = NAT_PROTO_UDP; 292 *port = ntohs(udp->uh_sport); 293 return (0); 294 case IPPROTO_ICMP: 295 /* 296 * We will translate only ICMP errors for our ICMP 297 * echo requests. 298 */ 299 icmp = mtodo(*m, off); 300 if (icmp->icmp_type != ICMP_ECHO) 301 return (EOPNOTSUPP); 302 *port = ntohs(*((uint16_t *)(icmp + 1))); 303 return (0); 304 }; 305 return (EOPNOTSUPP); 306 } 307 308 static inline uint8_t 309 convert_tcp_flags(uint8_t flags) 310 { 311 uint8_t result; 312 313 result = flags & (TH_FIN|TH_SYN); 314 result |= (flags & TH_RST) >> 2; /* Treat RST as FIN */ 315 result |= (flags & TH_ACK) >> 2; /* Treat ACK as estab */ 316 317 return (result); 318 } 319 320 static NAT64NOINLINE int 321 nat64lsn_translate4(struct nat64lsn_cfg *cfg, const struct ipfw_flow_id *f_id, 322 struct mbuf **pm) 323 { 324 struct pfloghdr loghdr, *logdata; 325 struct in6_addr src6; 326 struct nat64lsn_portgroup *pg; 327 struct nat64lsn_host *nh; 328 struct nat64lsn_state *st; 329 struct ip *ip; 330 uint32_t addr; 331 uint16_t state_flags, state_ts; 332 uint16_t port, lport; 333 uint8_t nat_proto; 334 int ret; 335 336 addr = f_id->dst_ip; 337 port = f_id->dst_port; 338 if (addr < cfg->prefix4 || addr > cfg->pmask4) { 339 NAT64STAT_INC(&cfg->stats, nomatch4); 340 return (cfg->nomatch_verdict); 341 } 342 343 /* Check if protocol is supported and get its short id */ 344 nat_proto = nat64lsn_proto_map[f_id->proto]; 345 if (nat_proto == 0) { 346 NAT64STAT_INC(&cfg->stats, noproto); 347 return (cfg->nomatch_verdict); 348 } 349 350 /* We might need to handle icmp differently */ 351 if (nat_proto == NAT_PROTO_ICMP) { 352 ret = inspect_icmp_mbuf(pm, &nat_proto, &addr, &port); 353 if (ret != 0) { 354 if (ret == ENOMEM) { 355 NAT64STAT_INC(&cfg->stats, nomem); 356 return (IP_FW_DENY); 357 } 358 NAT64STAT_INC(&cfg->stats, noproto); 359 return (cfg->nomatch_verdict); 360 } 361 /* XXX: Check addr for validity */ 362 if (addr < cfg->prefix4 || addr > cfg->pmask4) { 363 NAT64STAT_INC(&cfg->stats, nomatch4); 364 return (cfg->nomatch_verdict); 365 } 366 } 367 368 /* Calc portgroup offset w.r.t protocol */ 369 pg = GET_PORTGROUP(cfg, addr, nat_proto, port); 370 371 /* Check if this port is occupied by any portgroup */ 372 if (pg == NULL) { 373 NAT64STAT_INC(&cfg->stats, nomatch4); 374 #if 0 375 DPRINTF(DP_STATE, "NOMATCH %u %d %d (%d)", addr, nat_proto, port, 376 _GET_PORTGROUP_IDX(cfg, addr, nat_proto, port)); 377 #endif 378 return (cfg->nomatch_verdict); 379 } 380 381 /* TODO: Check flags to see if we need to do some static mapping */ 382 nh = pg->host; 383 384 /* Prepare some fields we might need to update */ 385 SET_AGE(state_ts); 386 ip = mtod(*pm, struct ip *); 387 if (ip->ip_p == IPPROTO_TCP) 388 state_flags = convert_tcp_flags( 389 L3HDR(ip, struct tcphdr *)->th_flags); 390 else 391 state_flags = 0; 392 393 /* Lock host and get port mapping */ 394 NAT64_LOCK(nh); 395 396 st = &pg->states[port & (NAT64_CHUNK_SIZE - 1)]; 397 if (st->timestamp != state_ts) 398 st->timestamp = state_ts; 399 if ((st->flags & state_flags) != state_flags) 400 st->flags |= state_flags; 401 lport = htons(st->u.s.lport); 402 403 NAT64_UNLOCK(nh); 404 405 if (cfg->flags & NAT64_LOG) { 406 logdata = &loghdr; 407 nat64lsn_log(logdata, *pm, AF_INET, pg->idx, st->cur.off); 408 } else 409 logdata = NULL; 410 411 src6.s6_addr32[0] = cfg->prefix6.s6_addr32[0]; 412 src6.s6_addr32[1] = cfg->prefix6.s6_addr32[1]; 413 src6.s6_addr32[2] = cfg->prefix6.s6_addr32[2]; 414 src6.s6_addr32[3] = htonl(f_id->src_ip); 415 416 ret = nat64_do_handle_ip4(*pm, &src6, &nh->addr, lport, 417 &cfg->stats, logdata); 418 419 if (ret == NAT64SKIP) 420 return (cfg->nomatch_verdict); 421 if (ret == NAT64MFREE) 422 m_freem(*pm); 423 *pm = NULL; 424 425 return (IP_FW_DENY); 426 } 427 428 void 429 nat64lsn_dump_state(const struct nat64lsn_cfg *cfg, 430 const struct nat64lsn_portgroup *pg, const struct nat64lsn_state *st, 431 const char *px, int off) 432 { 433 char s[INET6_ADDRSTRLEN], a[INET_ADDRSTRLEN], d[INET_ADDRSTRLEN]; 434 435 if ((nat64_debug & DP_STATE) == 0) 436 return; 437 inet_ntop(AF_INET6, &pg->host->addr, s, sizeof(s)); 438 inet_ntop(AF_INET, &pg->aaddr, a, sizeof(a)); 439 inet_ntop(AF_INET, &st->u.s.faddr, d, sizeof(d)); 440 441 DPRINTF(DP_STATE, "%s: PG %d ST [%p|%d]: %s:%d/%d <%s:%d> " 442 "%s:%d AGE %d", px, pg->idx, st, off, 443 s, st->u.s.lport, pg->nat_proto, a, pg->aport + off, 444 d, st->u.s.fport, GET_AGE(st->timestamp)); 445 } 446 447 /* 448 * Check if particular TCP state is stale and should be deleted. 449 * Return 1 if true, 0 otherwise. 450 */ 451 static int 452 nat64lsn_periodic_check_tcp(const struct nat64lsn_cfg *cfg, 453 const struct nat64lsn_state *st, int age) 454 { 455 int ttl; 456 457 if (st->flags & NAT64_FLAG_FIN) 458 ttl = cfg->st_close_ttl; 459 else if (st->flags & NAT64_FLAG_ESTAB) 460 ttl = cfg->st_estab_ttl; 461 else if (st->flags & NAT64_FLAG_SYN) 462 ttl = cfg->st_syn_ttl; 463 else 464 ttl = cfg->st_syn_ttl; 465 466 if (age > ttl) 467 return (1); 468 return (0); 469 } 470 471 /* 472 * Check if nat state @st is stale and should be deleted. 473 * Return 1 if true, 0 otherwise. 474 */ 475 static NAT64NOINLINE int 476 nat64lsn_periodic_chkstate(const struct nat64lsn_cfg *cfg, 477 const struct nat64lsn_portgroup *pg, const struct nat64lsn_state *st) 478 { 479 int age, delete; 480 481 age = GET_AGE(st->timestamp); 482 delete = 0; 483 484 /* Skip immutable records */ 485 if (st->flags & NAT64_FLAG_RDR) 486 return (0); 487 488 switch (pg->nat_proto) { 489 case NAT_PROTO_TCP: 490 delete = nat64lsn_periodic_check_tcp(cfg, st, age); 491 break; 492 case NAT_PROTO_UDP: 493 if (age > cfg->st_udp_ttl) 494 delete = 1; 495 break; 496 case NAT_PROTO_ICMP: 497 if (age > cfg->st_icmp_ttl) 498 delete = 1; 499 break; 500 } 501 502 return (delete); 503 } 504 505 506 /* 507 * The following structures and functions 508 * are used to perform SLIST_FOREACH_SAFE() 509 * analog for states identified by struct st_ptr. 510 */ 511 512 struct st_idx { 513 struct nat64lsn_portgroup *pg; 514 struct nat64lsn_state *st; 515 struct st_ptr sidx_next; 516 }; 517 518 static struct st_idx * 519 st_first(const struct nat64lsn_cfg *cfg, const struct nat64lsn_host *nh, 520 struct st_ptr *sidx, struct st_idx *si) 521 { 522 struct nat64lsn_portgroup *pg; 523 struct nat64lsn_state *st; 524 525 if (sidx->idx == 0) { 526 memset(si, 0, sizeof(*si)); 527 return (si); 528 } 529 530 pg = PORTGROUP_BYSIDX(cfg, nh, sidx->idx); 531 st = &pg->states[sidx->off]; 532 533 si->pg = pg; 534 si->st = st; 535 si->sidx_next = st->next; 536 537 return (si); 538 } 539 540 static struct st_idx * 541 st_next(const struct nat64lsn_cfg *cfg, const struct nat64lsn_host *nh, 542 struct st_idx *si) 543 { 544 struct st_ptr sidx; 545 struct nat64lsn_portgroup *pg; 546 struct nat64lsn_state *st; 547 548 sidx = si->sidx_next; 549 if (sidx.idx == 0) { 550 memset(si, 0, sizeof(*si)); 551 si->st = NULL; 552 si->pg = NULL; 553 return (si); 554 } 555 556 pg = PORTGROUP_BYSIDX(cfg, nh, sidx.idx); 557 st = &pg->states[sidx.off]; 558 559 si->pg = pg; 560 si->st = st; 561 si->sidx_next = st->next; 562 563 return (si); 564 } 565 566 static struct st_idx * 567 st_save_cond(struct st_idx *si_dst, struct st_idx *si) 568 { 569 if (si->st != NULL) 570 *si_dst = *si; 571 572 return (si_dst); 573 } 574 575 unsigned int 576 nat64lsn_periodic_chkstates(struct nat64lsn_cfg *cfg, struct nat64lsn_host *nh) 577 { 578 struct st_idx si, si_prev; 579 int i; 580 unsigned int delcount; 581 582 delcount = 0; 583 for (i = 0; i < nh->hsize; i++) { 584 memset(&si_prev, 0, sizeof(si_prev)); 585 for (st_first(cfg, nh, &nh->phash[i], &si); 586 si.st != NULL; 587 st_save_cond(&si_prev, &si), st_next(cfg, nh, &si)) { 588 if (nat64lsn_periodic_chkstate(cfg, si.pg, si.st) == 0) 589 continue; 590 nat64lsn_dump_state(cfg, si.pg, si.st, "DELETE STATE", 591 si.st->cur.off); 592 /* Unlink from hash */ 593 if (si_prev.st != NULL) 594 si_prev.st->next = si.st->next; 595 else 596 nh->phash[i] = si.st->next; 597 /* Delete state and free its data */ 598 PG_MARK_FREE_IDX(si.pg, si.st->cur.off); 599 memset(si.st, 0, sizeof(struct nat64lsn_state)); 600 si.st = NULL; 601 delcount++; 602 603 /* Update portgroup timestamp */ 604 SET_AGE(si.pg->timestamp); 605 } 606 } 607 NAT64STAT_ADD(&cfg->stats, sdeleted, delcount); 608 return (delcount); 609 } 610 611 /* 612 * Checks if portgroup is not used and can be deleted, 613 * Returns 1 if stale, 0 otherwise 614 */ 615 static int 616 stale_pg(const struct nat64lsn_cfg *cfg, const struct nat64lsn_portgroup *pg) 617 { 618 619 if (!PG_IS_EMPTY(pg)) 620 return (0); 621 if (GET_AGE(pg->timestamp) < cfg->pg_delete_delay) 622 return (0); 623 return (1); 624 } 625 626 /* 627 * Checks if host record is not used and can be deleted, 628 * Returns 1 if stale, 0 otherwise 629 */ 630 static int 631 stale_nh(const struct nat64lsn_cfg *cfg, const struct nat64lsn_host *nh) 632 { 633 634 if (nh->pg_used != 0) 635 return (0); 636 if (GET_AGE(nh->timestamp) < cfg->nh_delete_delay) 637 return (0); 638 return (1); 639 } 640 641 struct nat64lsn_periodic_data { 642 struct nat64lsn_cfg *cfg; 643 struct nat64lsn_job_head jhead; 644 int jlen; 645 }; 646 647 static NAT64NOINLINE int 648 nat64lsn_periodic_chkhost(struct nat64lsn_host *nh, 649 struct nat64lsn_periodic_data *d) 650 { 651 char a[INET6_ADDRSTRLEN]; 652 struct nat64lsn_portgroup *pg; 653 struct nat64lsn_job_item *ji; 654 uint64_t delmask[NAT64LSN_PGPTRNMASK]; 655 int delcount, i; 656 657 delcount = 0; 658 memset(delmask, 0, sizeof(delmask)); 659 660 inet_ntop(AF_INET6, &nh->addr, a, sizeof(a)); 661 DPRINTF(DP_JQUEUE, "Checking %s host %s on cpu %d", 662 stale_nh(d->cfg, nh) ? "stale" : "non-stale", a, curcpu); 663 if (!stale_nh(d->cfg, nh)) { 664 /* Non-stale host. Inspect internals */ 665 NAT64_LOCK(nh); 666 667 /* Stage 1: Check&expire states */ 668 if (nat64lsn_periodic_chkstates(d->cfg, nh) != 0) 669 SET_AGE(nh->timestamp); 670 671 /* Stage 2: Check if we need to expire */ 672 for (i = 0; i < nh->pg_used; i++) { 673 pg = PORTGROUP_BYSIDX(d->cfg, nh, i + 1); 674 if (pg == NULL) 675 continue; 676 677 /* Check if we can delete portgroup */ 678 if (stale_pg(d->cfg, pg) == 0) 679 continue; 680 681 DPRINTF(DP_JQUEUE, "Check PG %d", i); 682 delmask[i / 64] |= ((uint64_t)1 << (i % 64)); 683 delcount++; 684 } 685 686 NAT64_UNLOCK(nh); 687 if (delcount == 0) 688 return (0); 689 } 690 691 DPRINTF(DP_JQUEUE, "Queueing %d portgroups for deleting", delcount); 692 /* We have something to delete - add it to queue */ 693 ji = nat64lsn_create_job(d->cfg, NULL, JTYPE_DELPORTGROUP); 694 if (ji == NULL) 695 return (0); 696 697 ji->haddr = nh->addr; 698 ji->delcount = delcount; 699 memcpy(ji->delmask, delmask, sizeof(ji->delmask)); 700 701 TAILQ_INSERT_TAIL(&d->jhead, ji, next); 702 d->jlen++; 703 return (0); 704 } 705 706 /* 707 * This procedure is used to perform various maintance 708 * on dynamic hash list. Currently it is called every second. 709 */ 710 static void 711 nat64lsn_periodic(void *data) 712 { 713 struct ip_fw_chain *ch; 714 IPFW_RLOCK_TRACKER; 715 struct nat64lsn_cfg *cfg; 716 struct nat64lsn_periodic_data d; 717 struct nat64lsn_host *nh, *tmp; 718 719 cfg = (struct nat64lsn_cfg *) data; 720 ch = cfg->ch; 721 CURVNET_SET(cfg->vp); 722 723 memset(&d, 0, sizeof(d)); 724 d.cfg = cfg; 725 TAILQ_INIT(&d.jhead); 726 727 IPFW_RLOCK(ch); 728 729 /* Stage 1: foreach host, check all its portgroups */ 730 I6HASH_FOREACH_SAFE(cfg, nh, tmp, nat64lsn_periodic_chkhost, &d); 731 732 /* Enqueue everything we have requested */ 733 nat64lsn_enqueue_jobs(cfg, &d.jhead, d.jlen); 734 735 callout_schedule(&cfg->periodic, hz * PERIODIC_DELAY); 736 737 IPFW_RUNLOCK(ch); 738 739 CURVNET_RESTORE(); 740 } 741 742 static NAT64NOINLINE void 743 reinject_mbuf(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji) 744 { 745 746 if (ji->m == NULL) 747 return; 748 749 /* Request has failed or packet type is wrong */ 750 if (ji->f_id.addr_type != 6 || ji->done == 0) { 751 m_freem(ji->m); 752 ji->m = NULL; 753 NAT64STAT_INC(&cfg->stats, dropped); 754 DPRINTF(DP_DROPS, "mbuf dropped: type %d, done %d", 755 ji->jtype, ji->done); 756 return; 757 } 758 759 /* 760 * XXX: Limit recursion level 761 */ 762 763 NAT64STAT_INC(&cfg->stats, jreinjected); 764 DPRINTF(DP_JQUEUE, "Reinject mbuf"); 765 nat64lsn_translate6(cfg, &ji->f_id, &ji->m); 766 } 767 768 static void 769 destroy_portgroup(struct nat64lsn_portgroup *pg) 770 { 771 772 DPRINTF(DP_OBJ, "DESTROY PORTGROUP %d %p", pg->idx, pg); 773 uma_zfree(nat64lsn_pg_zone, pg); 774 } 775 776 static NAT64NOINLINE int 777 alloc_portgroup(struct nat64lsn_job_item *ji) 778 { 779 struct nat64lsn_portgroup *pg; 780 781 pg = uma_zalloc(nat64lsn_pg_zone, M_NOWAIT); 782 if (pg == NULL) 783 return (1); 784 785 if (ji->needs_idx != 0) { 786 ji->spare_idx = uma_zalloc(nat64lsn_pgidx_zone, M_NOWAIT); 787 /* Failed alloc isn't always fatal, so don't check */ 788 } 789 memset(&pg->freemask, 0xFF, sizeof(pg->freemask)); 790 pg->nat_proto = ji->nat_proto; 791 ji->pg = pg; 792 return (0); 793 794 } 795 796 static void 797 destroy_host6(struct nat64lsn_host *nh) 798 { 799 char a[INET6_ADDRSTRLEN]; 800 int i; 801 802 inet_ntop(AF_INET6, &nh->addr, a, sizeof(a)); 803 DPRINTF(DP_OBJ, "DESTROY HOST %s %p (pg used %d)", a, nh, 804 nh->pg_used); 805 NAT64_LOCK_DESTROY(nh); 806 for (i = 0; i < nh->pg_allocated / NAT64LSN_PGIDX_CHUNK; i++) 807 uma_zfree(nat64lsn_pgidx_zone, PORTGROUP_CHUNK(nh, i)); 808 uma_zfree(nat64lsn_host_zone, nh); 809 } 810 811 static NAT64NOINLINE int 812 alloc_host6(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji) 813 { 814 struct nat64lsn_host *nh; 815 char a[INET6_ADDRSTRLEN]; 816 817 nh = uma_zalloc(nat64lsn_host_zone, M_NOWAIT); 818 if (nh == NULL) 819 return (1); 820 PORTGROUP_CHUNK(nh, 0) = uma_zalloc(nat64lsn_pgidx_zone, M_NOWAIT); 821 if (PORTGROUP_CHUNK(nh, 0) == NULL) { 822 uma_zfree(nat64lsn_host_zone, nh); 823 return (2); 824 } 825 if (alloc_portgroup(ji) != 0) { 826 NAT64STAT_INC(&cfg->stats, jportfails); 827 uma_zfree(nat64lsn_pgidx_zone, PORTGROUP_CHUNK(nh, 0)); 828 uma_zfree(nat64lsn_host_zone, nh); 829 return (3); 830 } 831 832 NAT64_LOCK_INIT(nh); 833 nh->addr = ji->haddr; 834 nh->hsize = NAT64LSN_HSIZE; /* XXX: hardcoded size */ 835 nh->pg_allocated = NAT64LSN_PGIDX_CHUNK; 836 nh->pg_used = 0; 837 ji->nh = nh; 838 839 inet_ntop(AF_INET6, &nh->addr, a, sizeof(a)); 840 DPRINTF(DP_OBJ, "ALLOC HOST %s %p", a, ji->nh); 841 return (0); 842 } 843 844 /* 845 * Finds free @pg index inside @nh 846 */ 847 static NAT64NOINLINE int 848 find_nh_pg_idx(struct nat64lsn_cfg *cfg, struct nat64lsn_host *nh, int *idx) 849 { 850 int i; 851 852 for (i = 0; i < nh->pg_allocated; i++) { 853 if (PORTGROUP_BYSIDX(cfg, nh, i + 1) == NULL) { 854 *idx = i; 855 return (0); 856 } 857 } 858 return (1); 859 } 860 861 static NAT64NOINLINE int 862 attach_host6(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji) 863 { 864 char a[INET6_ADDRSTRLEN]; 865 struct nat64lsn_host *nh; 866 867 I6HASH_FIND(cfg, nh, &ji->haddr); 868 if (nh == NULL) { 869 /* Add new host to list */ 870 nh = ji->nh; 871 I6HASH_INSERT(cfg, nh); 872 cfg->ihcount++; 873 ji->nh = NULL; 874 875 inet_ntop(AF_INET6, &nh->addr, a, sizeof(a)); 876 DPRINTF(DP_OBJ, "ATTACH HOST %s %p", a, nh); 877 /* 878 * Try to add portgroup. 879 * Note it will automatically set 880 * 'done' on ji if successful. 881 */ 882 if (attach_portgroup(cfg, ji) != 0) { 883 DPRINTF(DP_DROPS, "%s %p failed to attach PG", 884 a, nh); 885 NAT64STAT_INC(&cfg->stats, jportfails); 886 return (1); 887 } 888 return (0); 889 } 890 891 /* 892 * nh isn't NULL. This probably means we had several simultaneous 893 * host requests. The previous one request has already attached 894 * this host. Requeue attached mbuf and mark job as done, but 895 * leave nh and pg pointers not changed, so nat64lsn_do_request() 896 * will release all allocated resources. 897 */ 898 inet_ntop(AF_INET6, &nh->addr, a, sizeof(a)); 899 DPRINTF(DP_OBJ, "%s %p is already attached as %p", 900 a, ji->nh, nh); 901 ji->done = 1; 902 return (0); 903 } 904 905 static NAT64NOINLINE int 906 find_pg_place_addr(const struct nat64lsn_cfg *cfg, int addr_off, 907 int nat_proto, uint16_t *aport, int *ppg_idx) 908 { 909 int j, pg_idx; 910 911 pg_idx = addr_off * _ADDR_PG_COUNT + 912 (nat_proto - 1) * _ADDR_PG_PROTO_COUNT; 913 914 for (j = NAT64_MIN_CHUNK; j < _ADDR_PG_PROTO_COUNT; j++) { 915 if (cfg->pg[pg_idx + j] != NULL) 916 continue; 917 918 *aport = j * NAT64_CHUNK_SIZE; 919 *ppg_idx = pg_idx + j; 920 return (1); 921 } 922 923 return (0); 924 } 925 926 /* 927 * XXX: This function needs to be rewritten to 928 * use free bitmask for faster pg finding, 929 * additionally, it should take into consideration 930 * a) randomization and 931 * b) previous addresses allocated to given nat instance 932 * 933 */ 934 static NAT64NOINLINE int 935 find_portgroup_place(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji, 936 uint32_t *aaddr, uint16_t *aport, int *ppg_idx) 937 { 938 int i, nat_proto; 939 940 /* 941 * XXX: Use bitmask index to be able to find/check if IP address 942 * has some spare pg's 943 */ 944 nat_proto = ji->nat_proto; 945 946 /* First, try to use same address */ 947 if (ji->aaddr != 0) { 948 i = ntohl(ji->aaddr) - cfg->prefix4; 949 if (find_pg_place_addr(cfg, i, nat_proto, aport, 950 ppg_idx) != 0){ 951 /* Found! */ 952 *aaddr = htonl(cfg->prefix4 + i); 953 return (0); 954 } 955 } 956 957 /* Next, try to use random address based on flow hash */ 958 i = ji->fhash % (1 << (32 - cfg->plen4)); 959 if (find_pg_place_addr(cfg, i, nat_proto, aport, ppg_idx) != 0) { 960 /* Found! */ 961 *aaddr = htonl(cfg->prefix4 + i); 962 return (0); 963 } 964 965 966 /* Last one: simply find ANY available */ 967 for (i = 0; i < (1 << (32 - cfg->plen4)); i++) { 968 if (find_pg_place_addr(cfg, i, nat_proto, aport, 969 ppg_idx) != 0){ 970 /* Found! */ 971 *aaddr = htonl(cfg->prefix4 + i); 972 return (0); 973 } 974 } 975 976 return (1); 977 } 978 979 static NAT64NOINLINE int 980 attach_portgroup(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji) 981 { 982 char a[INET6_ADDRSTRLEN]; 983 struct nat64lsn_portgroup *pg; 984 struct nat64lsn_host *nh; 985 uint32_t aaddr; 986 uint16_t aport; 987 int nh_pg_idx, pg_idx; 988 989 pg = ji->pg; 990 991 /* 992 * Find source host and bind: we can't rely on 993 * pg->host 994 */ 995 I6HASH_FIND(cfg, nh, &ji->haddr); 996 if (nh == NULL) 997 return (1); 998 999 /* Find spare port chunk */ 1000 if (find_portgroup_place(cfg, ji, &aaddr, &aport, &pg_idx) != 0) { 1001 inet_ntop(AF_INET6, &nh->addr, a, sizeof(a)); 1002 DPRINTF(DP_OBJ | DP_DROPS, "empty PG not found for %s", a); 1003 return (2); 1004 } 1005 1006 /* Expand PG indexes if needed */ 1007 if (nh->pg_allocated < cfg->max_chunks && ji->spare_idx != NULL) { 1008 PORTGROUP_CHUNK(nh, nh->pg_allocated / NAT64LSN_PGIDX_CHUNK) = 1009 ji->spare_idx; 1010 nh->pg_allocated += NAT64LSN_PGIDX_CHUNK; 1011 ji->spare_idx = NULL; 1012 } 1013 1014 /* Find empty index to store PG in the @nh */ 1015 if (find_nh_pg_idx(cfg, nh, &nh_pg_idx) != 0) { 1016 inet_ntop(AF_INET6, &nh->addr, a, sizeof(a)); 1017 DPRINTF(DP_OBJ | DP_DROPS, "free PG index not found for %s", 1018 a); 1019 return (3); 1020 } 1021 1022 cfg->pg[pg_idx] = pg; 1023 cfg->protochunks[pg->nat_proto]++; 1024 NAT64STAT_INC(&cfg->stats, spgcreated); 1025 1026 pg->aaddr = aaddr; 1027 pg->aport = aport; 1028 pg->host = nh; 1029 pg->idx = pg_idx; 1030 SET_AGE(pg->timestamp); 1031 1032 PORTGROUP_BYSIDX(cfg, nh, nh_pg_idx + 1) = pg; 1033 if (nh->pg_used == nh_pg_idx) 1034 nh->pg_used++; 1035 SET_AGE(nh->timestamp); 1036 1037 ji->pg = NULL; 1038 ji->done = 1; 1039 1040 return (0); 1041 } 1042 1043 static NAT64NOINLINE void 1044 consider_del_portgroup(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji) 1045 { 1046 struct nat64lsn_host *nh, *nh_tmp; 1047 struct nat64lsn_portgroup *pg, *pg_list[256]; 1048 int i, pg_lidx, idx; 1049 1050 /* Find source host */ 1051 I6HASH_FIND(cfg, nh, &ji->haddr); 1052 if (nh == NULL || nh->pg_used == 0) 1053 return; 1054 1055 memset(pg_list, 0, sizeof(pg_list)); 1056 pg_lidx = 0; 1057 1058 NAT64_LOCK(nh); 1059 1060 for (i = nh->pg_used - 1; i >= 0; i--) { 1061 if ((ji->delmask[i / 64] & ((uint64_t)1 << (i % 64))) == 0) 1062 continue; 1063 pg = PORTGROUP_BYSIDX(cfg, nh, i + 1); 1064 1065 /* Check that PG isn't busy. */ 1066 if (stale_pg(cfg, pg) == 0) 1067 continue; 1068 1069 /* DO delete */ 1070 pg_list[pg_lidx++] = pg; 1071 PORTGROUP_BYSIDX(cfg, nh, i + 1) = NULL; 1072 1073 idx = _GET_PORTGROUP_IDX(cfg, ntohl(pg->aaddr), pg->nat_proto, 1074 pg->aport); 1075 KASSERT(cfg->pg[idx] == pg, ("Non matched pg")); 1076 cfg->pg[idx] = NULL; 1077 cfg->protochunks[pg->nat_proto]--; 1078 NAT64STAT_INC(&cfg->stats, spgdeleted); 1079 1080 /* Decrease pg_used */ 1081 while (nh->pg_used > 0 && 1082 PORTGROUP_BYSIDX(cfg, nh, nh->pg_used) == NULL) 1083 nh->pg_used--; 1084 1085 /* Check if on-stack buffer has ended */ 1086 if (pg_lidx == nitems(pg_list)) 1087 break; 1088 } 1089 1090 NAT64_UNLOCK(nh); 1091 1092 if (stale_nh(cfg, nh)) { 1093 I6HASH_REMOVE(cfg, nh, nh_tmp, &ji->haddr); 1094 KASSERT(nh != NULL, ("Unable to find address")); 1095 cfg->ihcount--; 1096 ji->nh = nh; 1097 I6HASH_FIND(cfg, nh, &ji->haddr); 1098 KASSERT(nh == NULL, ("Failed to delete address")); 1099 } 1100 1101 /* TODO: Delay freeing portgroups */ 1102 while (pg_lidx > 0) { 1103 pg_lidx--; 1104 NAT64STAT_INC(&cfg->stats, spgdeleted); 1105 destroy_portgroup(pg_list[pg_lidx]); 1106 } 1107 } 1108 1109 /* 1110 * Main request handler. 1111 * Responsible for handling jqueue, e.g. 1112 * creating new hosts, addind/deleting portgroups. 1113 */ 1114 static NAT64NOINLINE void 1115 nat64lsn_do_request(void *data) 1116 { 1117 IPFW_RLOCK_TRACKER; 1118 struct nat64lsn_job_head jhead; 1119 struct nat64lsn_job_item *ji; 1120 int jcount, nhsize; 1121 struct nat64lsn_cfg *cfg = (struct nat64lsn_cfg *) data; 1122 struct ip_fw_chain *ch; 1123 int delcount; 1124 1125 CURVNET_SET(cfg->vp); 1126 1127 TAILQ_INIT(&jhead); 1128 1129 /* XXX: We're running unlocked here */ 1130 1131 ch = cfg->ch; 1132 delcount = 0; 1133 IPFW_RLOCK(ch); 1134 1135 /* Grab queue */ 1136 JQUEUE_LOCK(); 1137 TAILQ_SWAP(&jhead, &cfg->jhead, nat64lsn_job_item, next); 1138 jcount = cfg->jlen; 1139 cfg->jlen = 0; 1140 JQUEUE_UNLOCK(); 1141 1142 /* check if we need to resize hash */ 1143 nhsize = 0; 1144 if (cfg->ihcount > cfg->ihsize && cfg->ihsize < 65536) { 1145 nhsize = cfg->ihsize; 1146 for ( ; cfg->ihcount > nhsize && nhsize < 65536; nhsize *= 2) 1147 ; 1148 } else if (cfg->ihcount < cfg->ihsize * 4) { 1149 nhsize = cfg->ihsize; 1150 for ( ; cfg->ihcount < nhsize * 4 && nhsize > 32; nhsize /= 2) 1151 ; 1152 } 1153 1154 IPFW_RUNLOCK(ch); 1155 1156 if (TAILQ_EMPTY(&jhead)) { 1157 CURVNET_RESTORE(); 1158 return; 1159 } 1160 1161 NAT64STAT_INC(&cfg->stats, jcalls); 1162 DPRINTF(DP_JQUEUE, "count=%d", jcount); 1163 1164 /* 1165 * TODO: 1166 * What we should do here is to build a hash 1167 * to ensure we don't have lots of duplicate requests. 1168 * Skip this for now. 1169 * 1170 * TODO: Limit per-call number of items 1171 */ 1172 1173 /* Pre-allocate everything for entire chain */ 1174 TAILQ_FOREACH(ji, &jhead, next) { 1175 switch (ji->jtype) { 1176 case JTYPE_NEWHOST: 1177 if (alloc_host6(cfg, ji) != 0) 1178 NAT64STAT_INC(&cfg->stats, jhostfails); 1179 break; 1180 case JTYPE_NEWPORTGROUP: 1181 if (alloc_portgroup(ji) != 0) 1182 NAT64STAT_INC(&cfg->stats, jportfails); 1183 break; 1184 case JTYPE_DELPORTGROUP: 1185 delcount += ji->delcount; 1186 break; 1187 default: 1188 break; 1189 } 1190 } 1191 1192 /* 1193 * TODO: Alloc hew hash 1194 */ 1195 nhsize = 0; 1196 if (nhsize > 0) { 1197 /* XXX: */ 1198 } 1199 1200 /* Apply all changes in batch */ 1201 IPFW_UH_WLOCK(ch); 1202 IPFW_WLOCK(ch); 1203 1204 TAILQ_FOREACH(ji, &jhead, next) { 1205 switch (ji->jtype) { 1206 case JTYPE_NEWHOST: 1207 if (ji->nh != NULL) 1208 attach_host6(cfg, ji); 1209 break; 1210 case JTYPE_NEWPORTGROUP: 1211 if (ji->pg != NULL && 1212 attach_portgroup(cfg, ji) != 0) 1213 NAT64STAT_INC(&cfg->stats, jportfails); 1214 break; 1215 case JTYPE_DELPORTGROUP: 1216 consider_del_portgroup(cfg, ji); 1217 break; 1218 } 1219 } 1220 1221 if (nhsize > 0) { 1222 /* XXX: Move everything to new hash */ 1223 } 1224 1225 IPFW_WUNLOCK(ch); 1226 IPFW_UH_WUNLOCK(ch); 1227 1228 /* Flush unused entries */ 1229 while (!TAILQ_EMPTY(&jhead)) { 1230 ji = TAILQ_FIRST(&jhead); 1231 TAILQ_REMOVE(&jhead, ji, next); 1232 if (ji->nh != NULL) 1233 destroy_host6(ji->nh); 1234 if (ji->pg != NULL) 1235 destroy_portgroup(ji->pg); 1236 if (ji->m != NULL) 1237 reinject_mbuf(cfg, ji); 1238 if (ji->spare_idx != NULL) 1239 uma_zfree(nat64lsn_pgidx_zone, ji->spare_idx); 1240 free(ji, M_IPFW); 1241 } 1242 CURVNET_RESTORE(); 1243 } 1244 1245 static NAT64NOINLINE struct nat64lsn_job_item * 1246 nat64lsn_create_job(struct nat64lsn_cfg *cfg, const struct ipfw_flow_id *f_id, 1247 int jtype) 1248 { 1249 struct nat64lsn_job_item *ji; 1250 struct in6_addr haddr; 1251 uint8_t nat_proto; 1252 1253 /* 1254 * Do not try to lock possibly contested mutex if we're near the limit. 1255 * Drop packet instead. 1256 */ 1257 if (cfg->jlen >= cfg->jmaxlen) { 1258 NAT64STAT_INC(&cfg->stats, jmaxlen); 1259 return (NULL); 1260 } 1261 1262 memset(&haddr, 0, sizeof(haddr)); 1263 nat_proto = 0; 1264 if (f_id != NULL) { 1265 haddr = f_id->src_ip6; 1266 nat_proto = nat64lsn_proto_map[f_id->proto]; 1267 1268 DPRINTF(DP_JQUEUE, "REQUEST pg nat_proto %d on proto %d", 1269 nat_proto, f_id->proto); 1270 1271 if (nat_proto == 0) 1272 return (NULL); 1273 } 1274 1275 ji = malloc(sizeof(struct nat64lsn_job_item), M_IPFW, 1276 M_NOWAIT | M_ZERO); 1277 1278 if (ji == NULL) { 1279 NAT64STAT_INC(&cfg->stats, jnomem); 1280 return (NULL); 1281 } 1282 1283 ji->jtype = jtype; 1284 1285 if (f_id != NULL) { 1286 ji->f_id = *f_id; 1287 ji->haddr = haddr; 1288 ji->nat_proto = nat_proto; 1289 } 1290 1291 return (ji); 1292 } 1293 1294 static NAT64NOINLINE void 1295 nat64lsn_enqueue_job(struct nat64lsn_cfg *cfg, struct nat64lsn_job_item *ji) 1296 { 1297 1298 if (ji == NULL) 1299 return; 1300 1301 JQUEUE_LOCK(); 1302 TAILQ_INSERT_TAIL(&cfg->jhead, ji, next); 1303 cfg->jlen++; 1304 NAT64STAT_INC(&cfg->stats, jrequests); 1305 1306 if (callout_pending(&cfg->jcallout) == 0) 1307 callout_reset(&cfg->jcallout, 1, nat64lsn_do_request, cfg); 1308 JQUEUE_UNLOCK(); 1309 } 1310 1311 static NAT64NOINLINE void 1312 nat64lsn_enqueue_jobs(struct nat64lsn_cfg *cfg, 1313 struct nat64lsn_job_head *jhead, int jlen) 1314 { 1315 1316 if (TAILQ_EMPTY(jhead)) 1317 return; 1318 1319 /* Attach current queue to execution one */ 1320 JQUEUE_LOCK(); 1321 TAILQ_CONCAT(&cfg->jhead, jhead, next); 1322 cfg->jlen += jlen; 1323 NAT64STAT_ADD(&cfg->stats, jrequests, jlen); 1324 1325 if (callout_pending(&cfg->jcallout) == 0) 1326 callout_reset(&cfg->jcallout, 1, nat64lsn_do_request, cfg); 1327 JQUEUE_UNLOCK(); 1328 } 1329 1330 static unsigned int 1331 flow6_hash(const struct ipfw_flow_id *f_id) 1332 { 1333 unsigned char hbuf[36]; 1334 1335 memcpy(hbuf, &f_id->dst_ip6, 16); 1336 memcpy(&hbuf[16], &f_id->src_ip6, 16); 1337 memcpy(&hbuf[32], &f_id->dst_port, 2); 1338 memcpy(&hbuf[32], &f_id->src_port, 2); 1339 1340 return (djb_hash(hbuf, sizeof(hbuf))); 1341 } 1342 1343 static NAT64NOINLINE int 1344 nat64lsn_request_host(struct nat64lsn_cfg *cfg, 1345 const struct ipfw_flow_id *f_id, struct mbuf **pm) 1346 { 1347 struct nat64lsn_job_item *ji; 1348 struct mbuf *m; 1349 1350 m = *pm; 1351 *pm = NULL; 1352 1353 ji = nat64lsn_create_job(cfg, f_id, JTYPE_NEWHOST); 1354 if (ji == NULL) { 1355 m_freem(m); 1356 NAT64STAT_INC(&cfg->stats, dropped); 1357 DPRINTF(DP_DROPS, "failed to create job"); 1358 } else { 1359 ji->m = m; 1360 /* Provide pseudo-random value based on flow */ 1361 ji->fhash = flow6_hash(f_id); 1362 nat64lsn_enqueue_job(cfg, ji); 1363 NAT64STAT_INC(&cfg->stats, jhostsreq); 1364 } 1365 1366 return (IP_FW_DENY); 1367 } 1368 1369 static NAT64NOINLINE int 1370 nat64lsn_request_portgroup(struct nat64lsn_cfg *cfg, 1371 const struct ipfw_flow_id *f_id, struct mbuf **pm, uint32_t aaddr, 1372 int needs_idx) 1373 { 1374 struct nat64lsn_job_item *ji; 1375 struct mbuf *m; 1376 1377 m = *pm; 1378 *pm = NULL; 1379 1380 ji = nat64lsn_create_job(cfg, f_id, JTYPE_NEWPORTGROUP); 1381 if (ji == NULL) { 1382 m_freem(m); 1383 NAT64STAT_INC(&cfg->stats, dropped); 1384 DPRINTF(DP_DROPS, "failed to create job"); 1385 } else { 1386 ji->m = m; 1387 /* Provide pseudo-random value based on flow */ 1388 ji->fhash = flow6_hash(f_id); 1389 ji->aaddr = aaddr; 1390 ji->needs_idx = needs_idx; 1391 nat64lsn_enqueue_job(cfg, ji); 1392 NAT64STAT_INC(&cfg->stats, jportreq); 1393 } 1394 1395 return (IP_FW_DENY); 1396 } 1397 1398 static NAT64NOINLINE struct nat64lsn_state * 1399 nat64lsn_create_state(struct nat64lsn_cfg *cfg, struct nat64lsn_host *nh, 1400 int nat_proto, struct nat64lsn_state *kst, uint32_t *aaddr) 1401 { 1402 struct nat64lsn_portgroup *pg; 1403 struct nat64lsn_state *st; 1404 int i, hval, off; 1405 1406 /* XXX: create additional bitmask for selecting proper portgroup */ 1407 for (i = 0; i < nh->pg_used; i++) { 1408 pg = PORTGROUP_BYSIDX(cfg, nh, i + 1); 1409 if (pg == NULL) 1410 continue; 1411 if (*aaddr == 0) 1412 *aaddr = pg->aaddr; 1413 if (pg->nat_proto != nat_proto) 1414 continue; 1415 1416 off = PG_GET_FREE_IDX(pg); 1417 if (off != 0) { 1418 /* We have found spare state. Use it */ 1419 off--; 1420 PG_MARK_BUSY_IDX(pg, off); 1421 st = &pg->states[off]; 1422 1423 /* 1424 * Fill in new info. Assume state was zeroed. 1425 * Timestamp and flags will be filled by caller. 1426 */ 1427 st->u.s = kst->u.s; 1428 st->cur.idx = i + 1; 1429 st->cur.off = off; 1430 1431 /* Insert into host hash table */ 1432 hval = HASH_IN4(&st->u.hkey) & (nh->hsize - 1); 1433 st->next = nh->phash[hval]; 1434 nh->phash[hval] = st->cur; 1435 1436 nat64lsn_dump_state(cfg, pg, st, "ALLOC STATE", off); 1437 1438 NAT64STAT_INC(&cfg->stats, screated); 1439 1440 return (st); 1441 } 1442 /* Saev last used alias affress */ 1443 *aaddr = pg->aaddr; 1444 } 1445 1446 return (NULL); 1447 } 1448 1449 static NAT64NOINLINE int 1450 nat64lsn_translate6(struct nat64lsn_cfg *cfg, struct ipfw_flow_id *f_id, 1451 struct mbuf **pm) 1452 { 1453 struct pfloghdr loghdr, *logdata; 1454 char a[INET6_ADDRSTRLEN]; 1455 struct nat64lsn_host *nh; 1456 struct st_ptr sidx; 1457 struct nat64lsn_state *st, kst; 1458 struct nat64lsn_portgroup *pg; 1459 struct icmp6_hdr *icmp6; 1460 uint32_t aaddr; 1461 int action, hval, nat_proto, proto; 1462 uint16_t aport, state_ts, state_flags; 1463 1464 /* Check if af/protocol is supported and get it short id */ 1465 nat_proto = nat64lsn_proto_map[f_id->proto]; 1466 if (nat_proto == 0) { 1467 /* 1468 * Since we can be called from jobs handler, we need 1469 * to free mbuf by self, do not leave this task to 1470 * ipfw_check_packet(). 1471 */ 1472 NAT64STAT_INC(&cfg->stats, noproto); 1473 m_freem(*pm); 1474 *pm = NULL; 1475 return (IP_FW_DENY); 1476 } 1477 1478 /* Try to find host first */ 1479 I6HASH_FIND(cfg, nh, &f_id->src_ip6); 1480 1481 if (nh == NULL) 1482 return (nat64lsn_request_host(cfg, f_id, pm)); 1483 1484 /* Fill-in on-stack state structure */ 1485 kst.u.s.faddr = f_id->dst_ip6.s6_addr32[3]; 1486 kst.u.s.fport = f_id->dst_port; 1487 kst.u.s.lport = f_id->src_port; 1488 1489 /* Prepare some fields we might need to update */ 1490 hval = 0; 1491 proto = nat64_getlasthdr(*pm, &hval); 1492 if (proto < 0) { 1493 NAT64STAT_INC(&cfg->stats, dropped); 1494 DPRINTF(DP_DROPS, "dropped due to mbuf isn't contigious"); 1495 m_freem(*pm); 1496 *pm = NULL; 1497 return (IP_FW_DENY); 1498 } 1499 1500 SET_AGE(state_ts); 1501 if (proto == IPPROTO_TCP) 1502 state_flags = convert_tcp_flags( 1503 TCP(mtodo(*pm, hval))->th_flags); 1504 else 1505 state_flags = 0; 1506 if (proto == IPPROTO_ICMPV6) { 1507 /* Alter local port data */ 1508 icmp6 = mtodo(*pm, hval); 1509 if (icmp6->icmp6_type == ICMP6_ECHO_REQUEST || 1510 icmp6->icmp6_type == ICMP6_ECHO_REPLY) 1511 kst.u.s.lport = ntohs(icmp6->icmp6_id); 1512 } 1513 1514 hval = HASH_IN4(&kst.u.hkey) & (nh->hsize - 1); 1515 pg = NULL; 1516 st = NULL; 1517 1518 /* OK, let's find state in host hash */ 1519 NAT64_LOCK(nh); 1520 sidx = nh->phash[hval]; 1521 int k = 0; 1522 while (sidx.idx != 0) { 1523 pg = PORTGROUP_BYSIDX(cfg, nh, sidx.idx); 1524 st = &pg->states[sidx.off]; 1525 //DPRINTF("SISX: %d/%d next: %d/%d", sidx.idx, sidx.off, 1526 //st->next.idx, st->next.off); 1527 if (st->u.hkey == kst.u.hkey && pg->nat_proto == nat_proto) 1528 break; 1529 if (k++ > 1000) { 1530 DPRINTF(DP_ALL, "XXX: too long %d/%d %d/%d\n", 1531 sidx.idx, sidx.off, st->next.idx, st->next.off); 1532 inet_ntop(AF_INET6, &nh->addr, a, sizeof(a)); 1533 DPRINTF(DP_GENERIC, "TR host %s %p on cpu %d", 1534 a, nh, curcpu); 1535 k = 0; 1536 } 1537 sidx = st->next; 1538 } 1539 1540 if (sidx.idx == 0) { 1541 aaddr = 0; 1542 st = nat64lsn_create_state(cfg, nh, nat_proto, &kst, &aaddr); 1543 if (st == NULL) { 1544 /* No free states. Request more if we can */ 1545 if (nh->pg_used >= cfg->max_chunks) { 1546 /* Limit reached */ 1547 NAT64STAT_INC(&cfg->stats, dropped); 1548 inet_ntop(AF_INET6, &nh->addr, a, sizeof(a)); 1549 DPRINTF(DP_DROPS, "PG limit reached " 1550 " for host %s (used %u, allocated %u, " 1551 "limit %u)", a, 1552 nh->pg_used * NAT64_CHUNK_SIZE, 1553 nh->pg_allocated * NAT64_CHUNK_SIZE, 1554 cfg->max_chunks * NAT64_CHUNK_SIZE); 1555 m_freem(*pm); 1556 *pm = NULL; 1557 NAT64_UNLOCK(nh); 1558 return (IP_FW_DENY); 1559 } 1560 if ((nh->pg_allocated <= 1561 nh->pg_used + NAT64LSN_REMAININGPG) && 1562 nh->pg_allocated < cfg->max_chunks) 1563 action = 1; /* Request new indexes */ 1564 else 1565 action = 0; 1566 NAT64_UNLOCK(nh); 1567 //DPRINTF("No state, unlock for %p", nh); 1568 return (nat64lsn_request_portgroup(cfg, f_id, 1569 pm, aaddr, action)); 1570 } 1571 1572 /* We've got new state. */ 1573 sidx = st->cur; 1574 pg = PORTGROUP_BYSIDX(cfg, nh, sidx.idx); 1575 } 1576 1577 /* Okay, state found */ 1578 1579 /* Update necessary fileds */ 1580 if (st->timestamp != state_ts) 1581 st->timestamp = state_ts; 1582 if ((st->flags & state_flags) != 0) 1583 st->flags |= state_flags; 1584 1585 /* Copy needed state data */ 1586 aaddr = pg->aaddr; 1587 aport = htons(pg->aport + sidx.off); 1588 1589 NAT64_UNLOCK(nh); 1590 1591 if (cfg->flags & NAT64_LOG) { 1592 logdata = &loghdr; 1593 nat64lsn_log(logdata, *pm, AF_INET6, pg->idx, st->cur.off); 1594 } else 1595 logdata = NULL; 1596 1597 action = nat64_do_handle_ip6(*pm, aaddr, aport, &cfg->stats, logdata); 1598 if (action == NAT64SKIP) 1599 return (cfg->nomatch_verdict); 1600 if (action == NAT64MFREE) 1601 m_freem(*pm); 1602 *pm = NULL; /* mark mbuf as consumed */ 1603 return (IP_FW_DENY); 1604 } 1605 1606 /* 1607 * Main dataplane entry point. 1608 */ 1609 int 1610 ipfw_nat64lsn(struct ip_fw_chain *ch, struct ip_fw_args *args, 1611 ipfw_insn *cmd, int *done) 1612 { 1613 ipfw_insn *icmd; 1614 struct nat64lsn_cfg *cfg; 1615 int ret; 1616 1617 IPFW_RLOCK_ASSERT(ch); 1618 1619 *done = 1; /* terminate the search */ 1620 icmd = cmd + 1; 1621 if (cmd->opcode != O_EXTERNAL_ACTION || 1622 cmd->arg1 != V_nat64lsn_eid || 1623 icmd->opcode != O_EXTERNAL_INSTANCE || 1624 (cfg = NAT64_LOOKUP(ch, icmd)) == NULL) 1625 return (0); 1626 1627 switch (args->f_id.addr_type) { 1628 case 4: 1629 ret = nat64lsn_translate4(cfg, &args->f_id, &args->m); 1630 break; 1631 case 6: 1632 ret = nat64lsn_translate6(cfg, &args->f_id, &args->m); 1633 break; 1634 default: 1635 return (cfg->nomatch_verdict); 1636 } 1637 return (ret); 1638 } 1639 1640 static int 1641 nat64lsn_ctor_host(void *mem, int size, void *arg, int flags) 1642 { 1643 struct nat64lsn_host *nh; 1644 1645 nh = (struct nat64lsn_host *)mem; 1646 memset(nh->pg_ptr, 0, sizeof(nh->pg_ptr)); 1647 memset(nh->phash, 0, sizeof(nh->phash)); 1648 return (0); 1649 } 1650 1651 static int 1652 nat64lsn_ctor_pgidx(void *mem, int size, void *arg, int flags) 1653 { 1654 1655 memset(mem, 0, size); 1656 return (0); 1657 } 1658 1659 void 1660 nat64lsn_init_internal(void) 1661 { 1662 1663 memset(nat64lsn_proto_map, 0, sizeof(nat64lsn_proto_map)); 1664 /* Set up supported protocol map */ 1665 nat64lsn_proto_map[IPPROTO_TCP] = NAT_PROTO_TCP; 1666 nat64lsn_proto_map[IPPROTO_UDP] = NAT_PROTO_UDP; 1667 nat64lsn_proto_map[IPPROTO_ICMP] = NAT_PROTO_ICMP; 1668 nat64lsn_proto_map[IPPROTO_ICMPV6] = NAT_PROTO_ICMP; 1669 /* Fill in reverse proto map */ 1670 memset(nat64lsn_rproto_map, 0, sizeof(nat64lsn_rproto_map)); 1671 nat64lsn_rproto_map[NAT_PROTO_TCP] = IPPROTO_TCP; 1672 nat64lsn_rproto_map[NAT_PROTO_UDP] = IPPROTO_UDP; 1673 nat64lsn_rproto_map[NAT_PROTO_ICMP] = IPPROTO_ICMPV6; 1674 1675 JQUEUE_LOCK_INIT(); 1676 nat64lsn_host_zone = uma_zcreate("NAT64 hosts zone", 1677 sizeof(struct nat64lsn_host), nat64lsn_ctor_host, NULL, 1678 NULL, NULL, UMA_ALIGN_PTR, 0); 1679 nat64lsn_pg_zone = uma_zcreate("NAT64 portgroups zone", 1680 sizeof(struct nat64lsn_portgroup), NULL, NULL, NULL, NULL, 1681 UMA_ALIGN_PTR, 0); 1682 nat64lsn_pgidx_zone = uma_zcreate("NAT64 portgroup indexes zone", 1683 sizeof(struct nat64lsn_portgroup *) * NAT64LSN_PGIDX_CHUNK, 1684 nat64lsn_ctor_pgidx, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 1685 } 1686 1687 void 1688 nat64lsn_uninit_internal(void) 1689 { 1690 1691 JQUEUE_LOCK_DESTROY(); 1692 uma_zdestroy(nat64lsn_host_zone); 1693 uma_zdestroy(nat64lsn_pg_zone); 1694 uma_zdestroy(nat64lsn_pgidx_zone); 1695 } 1696 1697 void 1698 nat64lsn_start_instance(struct nat64lsn_cfg *cfg) 1699 { 1700 1701 callout_reset(&cfg->periodic, hz * PERIODIC_DELAY, 1702 nat64lsn_periodic, cfg); 1703 } 1704 1705 struct nat64lsn_cfg * 1706 nat64lsn_init_instance(struct ip_fw_chain *ch, size_t numaddr) 1707 { 1708 struct nat64lsn_cfg *cfg; 1709 1710 cfg = malloc(sizeof(struct nat64lsn_cfg), M_IPFW, M_WAITOK | M_ZERO); 1711 TAILQ_INIT(&cfg->jhead); 1712 cfg->vp = curvnet; 1713 cfg->ch = ch; 1714 COUNTER_ARRAY_ALLOC(cfg->stats.stats, NAT64STATS, M_WAITOK); 1715 1716 cfg->ihsize = NAT64LSN_HSIZE; 1717 cfg->ih = malloc(sizeof(void *) * cfg->ihsize, M_IPFW, 1718 M_WAITOK | M_ZERO); 1719 1720 cfg->pg = malloc(sizeof(void *) * numaddr * _ADDR_PG_COUNT, M_IPFW, 1721 M_WAITOK | M_ZERO); 1722 1723 callout_init(&cfg->periodic, CALLOUT_MPSAFE); 1724 callout_init(&cfg->jcallout, CALLOUT_MPSAFE); 1725 1726 return (cfg); 1727 } 1728 1729 /* 1730 * Destroy all hosts callback. 1731 * Called on module unload when all activity already finished, so 1732 * can work without any locks. 1733 */ 1734 static NAT64NOINLINE int 1735 nat64lsn_destroy_host(struct nat64lsn_host *nh, struct nat64lsn_cfg *cfg) 1736 { 1737 struct nat64lsn_portgroup *pg; 1738 int i; 1739 1740 for (i = nh->pg_used; i > 0; i--) { 1741 pg = PORTGROUP_BYSIDX(cfg, nh, i); 1742 if (pg == NULL) 1743 continue; 1744 cfg->pg[pg->idx] = NULL; 1745 destroy_portgroup(pg); 1746 nh->pg_used--; 1747 } 1748 destroy_host6(nh); 1749 cfg->ihcount--; 1750 return (0); 1751 } 1752 1753 void 1754 nat64lsn_destroy_instance(struct nat64lsn_cfg *cfg) 1755 { 1756 struct nat64lsn_host *nh, *tmp; 1757 1758 callout_drain(&cfg->jcallout); 1759 callout_drain(&cfg->periodic); 1760 I6HASH_FOREACH_SAFE(cfg, nh, tmp, nat64lsn_destroy_host, cfg); 1761 DPRINTF(DP_OBJ, "instance %s: hosts %d", cfg->name, cfg->ihcount); 1762 1763 COUNTER_ARRAY_FREE(cfg->stats.stats, NAT64STATS); 1764 free(cfg->ih, M_IPFW); 1765 free(cfg->pg, M_IPFW); 1766 free(cfg, M_IPFW); 1767 } 1768 1769