1 /*- 2 * Copyright (c) 2015 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/sockopt.h> 45 #include <sys/queue.h> 46 47 #include <net/if.h> 48 #include <net/pfil.h> 49 50 #include <netinet/in.h> 51 #include <netinet/ip.h> 52 #include <netinet/ip_var.h> 53 #include <netinet/ip_fw.h> 54 55 #include <netpfil/ipfw/ip_fw_private.h> 56 #include <netpfil/ipfw/nat64/ip_fw_nat64.h> 57 #include <netpfil/ipfw/nat64/nat64lsn.h> 58 #include <netinet6/ip_fw_nat64.h> 59 60 VNET_DEFINE(uint16_t, nat64lsn_eid) = 0; 61 62 static struct nat64lsn_cfg * 63 nat64lsn_find(struct namedobj_instance *ni, const char *name, uint8_t set) 64 { 65 struct nat64lsn_cfg *cfg; 66 67 cfg = (struct nat64lsn_cfg *)ipfw_objhash_lookup_name_type(ni, set, 68 IPFW_TLV_NAT64LSN_NAME, name); 69 70 return (cfg); 71 } 72 73 static void 74 nat64lsn_default_config(ipfw_nat64lsn_cfg *uc) 75 { 76 77 if (uc->max_ports == 0) 78 uc->max_ports = NAT64LSN_MAX_PORTS; 79 else 80 uc->max_ports = roundup(uc->max_ports, NAT64_CHUNK_SIZE); 81 if (uc->max_ports > NAT64_CHUNK_SIZE * NAT64LSN_MAXPGPTR) 82 uc->max_ports = NAT64_CHUNK_SIZE * NAT64LSN_MAXPGPTR; 83 if (uc->jmaxlen == 0) 84 uc->jmaxlen = NAT64LSN_JMAXLEN; 85 if (uc->jmaxlen > 65536) 86 uc->jmaxlen = 65536; 87 if (uc->nh_delete_delay == 0) 88 uc->nh_delete_delay = NAT64LSN_HOST_AGE; 89 if (uc->pg_delete_delay == 0) 90 uc->pg_delete_delay = NAT64LSN_PG_AGE; 91 if (uc->st_syn_ttl == 0) 92 uc->st_syn_ttl = NAT64LSN_TCP_SYN_AGE; 93 if (uc->st_close_ttl == 0) 94 uc->st_close_ttl = NAT64LSN_TCP_FIN_AGE; 95 if (uc->st_estab_ttl == 0) 96 uc->st_estab_ttl = NAT64LSN_TCP_EST_AGE; 97 if (uc->st_udp_ttl == 0) 98 uc->st_udp_ttl = NAT64LSN_UDP_AGE; 99 if (uc->st_icmp_ttl == 0) 100 uc->st_icmp_ttl = NAT64LSN_ICMP_AGE; 101 } 102 103 /* 104 * Creates new nat64lsn instance. 105 * Data layout (v0)(current): 106 * Request: [ ipfw_obj_lheader ipfw_nat64lsn_cfg ] 107 * 108 * Returns 0 on success 109 */ 110 static int 111 nat64lsn_create(struct ip_fw_chain *ch, ip_fw3_opheader *op3, 112 struct sockopt_data *sd) 113 { 114 ipfw_obj_lheader *olh; 115 ipfw_nat64lsn_cfg *uc; 116 struct nat64lsn_cfg *cfg; 117 struct namedobj_instance *ni; 118 uint32_t addr4, mask4; 119 120 if (sd->valsize != sizeof(*olh) + sizeof(*uc)) 121 return (EINVAL); 122 123 olh = (ipfw_obj_lheader *)sd->kbuf; 124 uc = (ipfw_nat64lsn_cfg *)(olh + 1); 125 126 if (ipfw_check_object_name_generic(uc->name) != 0) 127 return (EINVAL); 128 129 if (uc->agg_prefix_len > 127 || uc->set >= IPFW_MAX_SETS) 130 return (EINVAL); 131 132 if (uc->plen4 > 32) 133 return (EINVAL); 134 if (uc->plen6 > 128 || ((uc->plen6 % 8) != 0)) 135 return (EINVAL); 136 137 /* XXX: Check prefix4 to be global */ 138 addr4 = ntohl(uc->prefix4.s_addr); 139 mask4 = ~((1 << (32 - uc->plen4)) - 1); 140 if ((addr4 & mask4) != addr4) 141 return (EINVAL); 142 143 /* XXX: Check prefix6 */ 144 if (uc->min_port == 0) 145 uc->min_port = NAT64_MIN_PORT; 146 if (uc->max_port == 0) 147 uc->max_port = 65535; 148 if (uc->min_port > uc->max_port) 149 return (EINVAL); 150 uc->min_port = roundup(uc->min_port, NAT64_CHUNK_SIZE); 151 uc->max_port = roundup(uc->max_port, NAT64_CHUNK_SIZE); 152 153 nat64lsn_default_config(uc); 154 155 ni = CHAIN_TO_SRV(ch); 156 IPFW_UH_RLOCK(ch); 157 if (nat64lsn_find(ni, uc->name, uc->set) != NULL) { 158 IPFW_UH_RUNLOCK(ch); 159 return (EEXIST); 160 } 161 IPFW_UH_RUNLOCK(ch); 162 163 cfg = nat64lsn_init_instance(ch, 1 << (32 - uc->plen4)); 164 strlcpy(cfg->name, uc->name, sizeof(cfg->name)); 165 cfg->no.name = cfg->name; 166 cfg->no.etlv = IPFW_TLV_NAT64LSN_NAME; 167 cfg->no.set = uc->set; 168 169 cfg->prefix4 = addr4; 170 cfg->pmask4 = addr4 | ~mask4; 171 /* XXX: Copy 96 bits */ 172 cfg->plen6 = 96; 173 memcpy(&cfg->prefix6, &uc->prefix6, cfg->plen6 / 8); 174 cfg->plen4 = uc->plen4; 175 cfg->flags = uc->flags & NAT64LSN_FLAGSMASK; 176 cfg->max_chunks = uc->max_ports / NAT64_CHUNK_SIZE; 177 cfg->agg_prefix_len = uc->agg_prefix_len; 178 cfg->agg_prefix_max = uc->agg_prefix_max; 179 180 cfg->min_chunk = uc->min_port / NAT64_CHUNK_SIZE; 181 cfg->max_chunk = uc->max_port / NAT64_CHUNK_SIZE; 182 183 cfg->jmaxlen = uc->jmaxlen; 184 cfg->nh_delete_delay = uc->nh_delete_delay; 185 cfg->pg_delete_delay = uc->pg_delete_delay; 186 cfg->st_syn_ttl = uc->st_syn_ttl; 187 cfg->st_close_ttl = uc->st_close_ttl; 188 cfg->st_estab_ttl = uc->st_estab_ttl; 189 cfg->st_udp_ttl = uc->st_udp_ttl; 190 cfg->st_icmp_ttl = uc->st_icmp_ttl; 191 192 cfg->nomatch_verdict = IP_FW_DENY; 193 cfg->nomatch_final = 1; /* Exit outer loop by default */ 194 195 IPFW_UH_WLOCK(ch); 196 197 if (nat64lsn_find(ni, uc->name, uc->set) != NULL) { 198 IPFW_UH_WUNLOCK(ch); 199 nat64lsn_destroy_instance(cfg); 200 return (EEXIST); 201 } 202 203 if (ipfw_objhash_alloc_idx(CHAIN_TO_SRV(ch), &cfg->no.kidx) != 0) { 204 IPFW_UH_WUNLOCK(ch); 205 nat64lsn_destroy_instance(cfg); 206 return (ENOSPC); 207 } 208 ipfw_objhash_add(CHAIN_TO_SRV(ch), &cfg->no); 209 210 /* Okay, let's link data */ 211 SRV_OBJECT(ch, cfg->no.kidx) = cfg; 212 nat64lsn_start_instance(cfg); 213 214 IPFW_UH_WUNLOCK(ch); 215 return (0); 216 } 217 218 static void 219 nat64lsn_detach_config(struct ip_fw_chain *ch, struct nat64lsn_cfg *cfg) 220 { 221 222 IPFW_UH_WLOCK_ASSERT(ch); 223 224 ipfw_objhash_del(CHAIN_TO_SRV(ch), &cfg->no); 225 ipfw_objhash_free_idx(CHAIN_TO_SRV(ch), cfg->no.kidx); 226 } 227 228 /* 229 * Destroys nat64 instance. 230 * Data layout (v0)(current): 231 * Request: [ ipfw_obj_header ] 232 * 233 * Returns 0 on success 234 */ 235 static int 236 nat64lsn_destroy(struct ip_fw_chain *ch, ip_fw3_opheader *op3, 237 struct sockopt_data *sd) 238 { 239 struct nat64lsn_cfg *cfg; 240 ipfw_obj_header *oh; 241 242 if (sd->valsize != sizeof(*oh)) 243 return (EINVAL); 244 245 oh = (ipfw_obj_header *)op3; 246 247 IPFW_UH_WLOCK(ch); 248 cfg = nat64lsn_find(CHAIN_TO_SRV(ch), oh->ntlv.name, oh->ntlv.set); 249 if (cfg == NULL) { 250 IPFW_UH_WUNLOCK(ch); 251 return (ESRCH); 252 } 253 254 if (cfg->no.refcnt > 0) { 255 IPFW_UH_WUNLOCK(ch); 256 return (EBUSY); 257 } 258 259 SRV_OBJECT(ch, cfg->no.kidx) = NULL; 260 nat64lsn_detach_config(ch, cfg); 261 IPFW_UH_WUNLOCK(ch); 262 263 nat64lsn_destroy_instance(cfg); 264 return (0); 265 } 266 267 #define __COPY_STAT_FIELD(_cfg, _stats, _field) \ 268 (_stats)->_field = NAT64STAT_FETCH(&(_cfg)->stats, _field) 269 static void 270 export_stats(struct ip_fw_chain *ch, struct nat64lsn_cfg *cfg, 271 struct ipfw_nat64lsn_stats *stats) 272 { 273 274 __COPY_STAT_FIELD(cfg, stats, opcnt64); 275 __COPY_STAT_FIELD(cfg, stats, opcnt46); 276 __COPY_STAT_FIELD(cfg, stats, ofrags); 277 __COPY_STAT_FIELD(cfg, stats, ifrags); 278 __COPY_STAT_FIELD(cfg, stats, oerrors); 279 __COPY_STAT_FIELD(cfg, stats, noroute4); 280 __COPY_STAT_FIELD(cfg, stats, noroute6); 281 __COPY_STAT_FIELD(cfg, stats, nomatch4); 282 __COPY_STAT_FIELD(cfg, stats, noproto); 283 __COPY_STAT_FIELD(cfg, stats, nomem); 284 __COPY_STAT_FIELD(cfg, stats, dropped); 285 286 __COPY_STAT_FIELD(cfg, stats, jcalls); 287 __COPY_STAT_FIELD(cfg, stats, jrequests); 288 __COPY_STAT_FIELD(cfg, stats, jhostsreq); 289 __COPY_STAT_FIELD(cfg, stats, jportreq); 290 __COPY_STAT_FIELD(cfg, stats, jhostfails); 291 __COPY_STAT_FIELD(cfg, stats, jportfails); 292 __COPY_STAT_FIELD(cfg, stats, jmaxlen); 293 __COPY_STAT_FIELD(cfg, stats, jnomem); 294 __COPY_STAT_FIELD(cfg, stats, jreinjected); 295 __COPY_STAT_FIELD(cfg, stats, screated); 296 __COPY_STAT_FIELD(cfg, stats, sdeleted); 297 __COPY_STAT_FIELD(cfg, stats, spgcreated); 298 __COPY_STAT_FIELD(cfg, stats, spgdeleted); 299 300 stats->hostcount = cfg->ihcount; 301 stats->tcpchunks = cfg->protochunks[NAT_PROTO_TCP]; 302 stats->udpchunks = cfg->protochunks[NAT_PROTO_UDP]; 303 stats->icmpchunks = cfg->protochunks[NAT_PROTO_ICMP]; 304 } 305 #undef __COPY_STAT_FIELD 306 307 static void 308 nat64lsn_export_config(struct ip_fw_chain *ch, struct nat64lsn_cfg *cfg, 309 ipfw_nat64lsn_cfg *uc) 310 { 311 312 uc->flags = cfg->flags & NAT64LSN_FLAGSMASK; 313 uc->max_ports = cfg->max_chunks * NAT64_CHUNK_SIZE; 314 uc->agg_prefix_len = cfg->agg_prefix_len; 315 uc->agg_prefix_max = cfg->agg_prefix_max; 316 317 uc->jmaxlen = cfg->jmaxlen; 318 uc->nh_delete_delay = cfg->nh_delete_delay; 319 uc->pg_delete_delay = cfg->pg_delete_delay; 320 uc->st_syn_ttl = cfg->st_syn_ttl; 321 uc->st_close_ttl = cfg->st_close_ttl; 322 uc->st_estab_ttl = cfg->st_estab_ttl; 323 uc->st_udp_ttl = cfg->st_udp_ttl; 324 uc->st_icmp_ttl = cfg->st_icmp_ttl; 325 uc->prefix4.s_addr = htonl(cfg->prefix4); 326 uc->prefix6 = cfg->prefix6; 327 uc->plen4 = cfg->plen4; 328 uc->plen6 = cfg->plen6; 329 uc->set = cfg->no.set; 330 strlcpy(uc->name, cfg->no.name, sizeof(uc->name)); 331 } 332 333 struct nat64_dump_arg { 334 struct ip_fw_chain *ch; 335 struct sockopt_data *sd; 336 }; 337 338 static int 339 export_config_cb(struct namedobj_instance *ni, struct named_object *no, 340 void *arg) 341 { 342 struct nat64_dump_arg *da = (struct nat64_dump_arg *)arg; 343 ipfw_nat64lsn_cfg *uc; 344 345 uc = (struct _ipfw_nat64lsn_cfg *)ipfw_get_sopt_space(da->sd, 346 sizeof(*uc)); 347 nat64lsn_export_config(da->ch, (struct nat64lsn_cfg *)no, uc); 348 return (0); 349 } 350 351 /* 352 * Lists all nat64 lsn instances currently available in kernel. 353 * Data layout (v0)(current): 354 * Request: [ ipfw_obj_lheader ] 355 * Reply: [ ipfw_obj_lheader ipfw_nat64lsn_cfg x N ] 356 * 357 * Returns 0 on success 358 */ 359 static int 360 nat64lsn_list(struct ip_fw_chain *ch, ip_fw3_opheader *op3, 361 struct sockopt_data *sd) 362 { 363 ipfw_obj_lheader *olh; 364 struct nat64_dump_arg da; 365 366 /* Check minimum header size */ 367 if (sd->valsize < sizeof(ipfw_obj_lheader)) 368 return (EINVAL); 369 370 olh = (ipfw_obj_lheader *)ipfw_get_sopt_header(sd, sizeof(*olh)); 371 372 IPFW_UH_RLOCK(ch); 373 olh->count = ipfw_objhash_count_type(CHAIN_TO_SRV(ch), 374 IPFW_TLV_NAT64LSN_NAME); 375 olh->objsize = sizeof(ipfw_nat64lsn_cfg); 376 olh->size = sizeof(*olh) + olh->count * olh->objsize; 377 378 if (sd->valsize < olh->size) { 379 IPFW_UH_RUNLOCK(ch); 380 return (ENOMEM); 381 } 382 memset(&da, 0, sizeof(da)); 383 da.ch = ch; 384 da.sd = sd; 385 ipfw_objhash_foreach_type(CHAIN_TO_SRV(ch), export_config_cb, &da, 386 IPFW_TLV_NAT64LSN_NAME); 387 IPFW_UH_RUNLOCK(ch); 388 389 return (0); 390 } 391 392 /* 393 * Change existing nat64lsn instance configuration. 394 * Data layout (v0)(current): 395 * Request: [ ipfw_obj_header ipfw_nat64lsn_cfg ] 396 * Reply: [ ipfw_obj_header ipfw_nat64lsn_cfg ] 397 * 398 * Returns 0 on success 399 */ 400 static int 401 nat64lsn_config(struct ip_fw_chain *ch, ip_fw3_opheader *op, 402 struct sockopt_data *sd) 403 { 404 ipfw_obj_header *oh; 405 ipfw_nat64lsn_cfg *uc; 406 struct nat64lsn_cfg *cfg; 407 struct namedobj_instance *ni; 408 409 if (sd->valsize != sizeof(*oh) + sizeof(*uc)) 410 return (EINVAL); 411 412 oh = (ipfw_obj_header *)ipfw_get_sopt_space(sd, 413 sizeof(*oh) + sizeof(*uc)); 414 uc = (ipfw_nat64lsn_cfg *)(oh + 1); 415 416 if (ipfw_check_object_name_generic(oh->ntlv.name) != 0 || 417 oh->ntlv.set >= IPFW_MAX_SETS) 418 return (EINVAL); 419 420 ni = CHAIN_TO_SRV(ch); 421 if (sd->sopt->sopt_dir == SOPT_GET) { 422 IPFW_UH_RLOCK(ch); 423 cfg = nat64lsn_find(ni, oh->ntlv.name, oh->ntlv.set); 424 if (cfg == NULL) { 425 IPFW_UH_RUNLOCK(ch); 426 return (EEXIST); 427 } 428 nat64lsn_export_config(ch, cfg, uc); 429 IPFW_UH_RUNLOCK(ch); 430 return (0); 431 } 432 433 nat64lsn_default_config(uc); 434 435 IPFW_UH_WLOCK(ch); 436 cfg = nat64lsn_find(ni, oh->ntlv.name, oh->ntlv.set); 437 if (cfg == NULL) { 438 IPFW_UH_WUNLOCK(ch); 439 return (EEXIST); 440 } 441 442 /* 443 * For now allow to change only following values: 444 * jmaxlen, nh_del_age, pg_del_age, tcp_syn_age, tcp_close_age, 445 * tcp_est_age, udp_age, icmp_age, flags, max_ports. 446 */ 447 448 cfg->max_chunks = uc->max_ports / NAT64_CHUNK_SIZE; 449 cfg->jmaxlen = uc->jmaxlen; 450 cfg->nh_delete_delay = uc->nh_delete_delay; 451 cfg->pg_delete_delay = uc->pg_delete_delay; 452 cfg->st_syn_ttl = uc->st_syn_ttl; 453 cfg->st_close_ttl = uc->st_close_ttl; 454 cfg->st_estab_ttl = uc->st_estab_ttl; 455 cfg->st_udp_ttl = uc->st_udp_ttl; 456 cfg->st_icmp_ttl = uc->st_icmp_ttl; 457 cfg->flags = uc->flags & NAT64LSN_FLAGSMASK; 458 459 IPFW_UH_WUNLOCK(ch); 460 461 return (0); 462 } 463 464 /* 465 * Get nat64lsn statistics. 466 * Data layout (v0)(current): 467 * Request: [ ipfw_obj_header ] 468 * Reply: [ ipfw_obj_header ipfw_counter_tlv ] 469 * 470 * Returns 0 on success 471 */ 472 static int 473 nat64lsn_stats(struct ip_fw_chain *ch, ip_fw3_opheader *op, 474 struct sockopt_data *sd) 475 { 476 struct ipfw_nat64lsn_stats stats; 477 struct nat64lsn_cfg *cfg; 478 ipfw_obj_header *oh; 479 ipfw_obj_ctlv *ctlv; 480 size_t sz; 481 482 sz = sizeof(ipfw_obj_header) + sizeof(ipfw_obj_ctlv) + sizeof(stats); 483 if (sd->valsize % sizeof(uint64_t)) 484 return (EINVAL); 485 if (sd->valsize < sz) 486 return (ENOMEM); 487 oh = (ipfw_obj_header *)ipfw_get_sopt_header(sd, sz); 488 if (oh == NULL) 489 return (EINVAL); 490 memset(&stats, 0, sizeof(stats)); 491 492 IPFW_UH_RLOCK(ch); 493 cfg = nat64lsn_find(CHAIN_TO_SRV(ch), oh->ntlv.name, oh->ntlv.set); 494 if (cfg == NULL) { 495 IPFW_UH_RUNLOCK(ch); 496 return (ESRCH); 497 } 498 499 export_stats(ch, cfg, &stats); 500 IPFW_UH_RUNLOCK(ch); 501 502 ctlv = (ipfw_obj_ctlv *)(oh + 1); 503 memset(ctlv, 0, sizeof(*ctlv)); 504 ctlv->head.type = IPFW_TLV_COUNTERS; 505 ctlv->head.length = sz - sizeof(ipfw_obj_header); 506 ctlv->count = sizeof(stats) / sizeof(uint64_t); 507 ctlv->objsize = sizeof(uint64_t); 508 ctlv->version = IPFW_NAT64_VERSION; 509 memcpy(ctlv + 1, &stats, sizeof(stats)); 510 return (0); 511 } 512 513 /* 514 * Reset nat64lsn statistics. 515 * Data layout (v0)(current): 516 * Request: [ ipfw_obj_header ] 517 * 518 * Returns 0 on success 519 */ 520 static int 521 nat64lsn_reset_stats(struct ip_fw_chain *ch, ip_fw3_opheader *op, 522 struct sockopt_data *sd) 523 { 524 struct nat64lsn_cfg *cfg; 525 ipfw_obj_header *oh; 526 527 if (sd->valsize != sizeof(*oh)) 528 return (EINVAL); 529 oh = (ipfw_obj_header *)sd->kbuf; 530 if (ipfw_check_object_name_generic(oh->ntlv.name) != 0 || 531 oh->ntlv.set >= IPFW_MAX_SETS) 532 return (EINVAL); 533 534 IPFW_UH_WLOCK(ch); 535 cfg = nat64lsn_find(CHAIN_TO_SRV(ch), oh->ntlv.name, oh->ntlv.set); 536 if (cfg == NULL) { 537 IPFW_UH_WUNLOCK(ch); 538 return (ESRCH); 539 } 540 COUNTER_ARRAY_ZERO(cfg->stats.stats, NAT64STATS); 541 IPFW_UH_WUNLOCK(ch); 542 return (0); 543 } 544 545 /* 546 * Reply: [ ipfw_obj_header ipfw_obj_data [ ipfw_nat64lsn_stg 547 * ipfw_nat64lsn_state x count, ... ] ] 548 */ 549 static int 550 export_pg_states(struct nat64lsn_cfg *cfg, struct nat64lsn_portgroup *pg, 551 ipfw_nat64lsn_stg *stg, struct sockopt_data *sd) 552 { 553 ipfw_nat64lsn_state *ste; 554 struct nat64lsn_state *st; 555 int i, count; 556 557 NAT64_LOCK(pg->host); 558 count = 0; 559 for (i = 0; i < 64; i++) { 560 if (PG_IS_BUSY_IDX(pg, i)) 561 count++; 562 } 563 DPRINTF(DP_STATE, "EXPORT PG %d, count %d", pg->idx, count); 564 565 if (count == 0) { 566 stg->count = 0; 567 NAT64_UNLOCK(pg->host); 568 return (0); 569 } 570 ste = (ipfw_nat64lsn_state *)ipfw_get_sopt_space(sd, 571 count * sizeof(ipfw_nat64lsn_state)); 572 if (ste == NULL) { 573 NAT64_UNLOCK(pg->host); 574 return (1); 575 } 576 577 stg->alias4.s_addr = pg->aaddr; 578 stg->proto = nat64lsn_rproto_map[pg->nat_proto]; 579 stg->flags = 0; 580 stg->host6 = pg->host->addr; 581 stg->count = count; 582 for (i = 0; i < 64; i++) { 583 if (PG_IS_FREE_IDX(pg, i)) 584 continue; 585 st = &pg->states[i]; 586 ste->daddr.s_addr = st->u.s.faddr; 587 ste->dport = st->u.s.fport; 588 ste->aport = pg->aport + i; 589 ste->sport = st->u.s.lport; 590 ste->flags = st->flags; /* XXX filter flags */ 591 ste->idle = GET_AGE(st->timestamp); 592 ste++; 593 } 594 NAT64_UNLOCK(pg->host); 595 596 return (0); 597 } 598 599 static int 600 get_next_idx(struct nat64lsn_cfg *cfg, uint32_t *addr, uint8_t *nat_proto, 601 uint16_t *port) 602 { 603 604 if (*port < 65536 - NAT64_CHUNK_SIZE) { 605 *port += NAT64_CHUNK_SIZE; 606 return (0); 607 } 608 *port = 0; 609 610 if (*nat_proto < NAT_MAX_PROTO - 1) { 611 *nat_proto += 1; 612 return (0); 613 } 614 *nat_proto = 1; 615 616 if (*addr < cfg->pmask4) { 617 *addr += 1; 618 return (0); 619 } 620 621 /* End of space. */ 622 return (1); 623 } 624 625 #define PACK_IDX(addr, proto, port) \ 626 ((uint64_t)addr << 32) | ((uint32_t)port << 16) | (proto << 8) 627 #define UNPACK_IDX(idx, addr, proto, port) \ 628 (addr) = (uint32_t)((idx) >> 32); \ 629 (port) = (uint16_t)(((idx) >> 16) & 0xFFFF); \ 630 (proto) = (uint8_t)(((idx) >> 8) & 0xFF) 631 632 static struct nat64lsn_portgroup * 633 get_next_pg(struct nat64lsn_cfg *cfg, uint32_t *addr, uint8_t *nat_proto, 634 uint16_t *port) 635 { 636 struct nat64lsn_portgroup *pg; 637 uint64_t pre_pack, post_pack; 638 639 pg = NULL; 640 pre_pack = PACK_IDX(*addr, *nat_proto, *port); 641 for (;;) { 642 if (get_next_idx(cfg, addr, nat_proto, port) != 0) { 643 /* End of states */ 644 return (pg); 645 } 646 647 pg = GET_PORTGROUP(cfg, *addr, *nat_proto, *port); 648 if (pg != NULL) 649 break; 650 } 651 652 post_pack = PACK_IDX(*addr, *nat_proto, *port); 653 if (pre_pack == post_pack) 654 DPRINTF(DP_STATE, "XXX: PACK_IDX %u %d %d", 655 *addr, *nat_proto, *port); 656 return (pg); 657 } 658 659 static NAT64NOINLINE struct nat64lsn_portgroup * 660 get_first_pg(struct nat64lsn_cfg *cfg, uint32_t *addr, uint8_t *nat_proto, 661 uint16_t *port) 662 { 663 struct nat64lsn_portgroup *pg; 664 665 pg = GET_PORTGROUP(cfg, *addr, *nat_proto, *port); 666 if (pg == NULL) 667 pg = get_next_pg(cfg, addr, nat_proto, port); 668 669 return (pg); 670 } 671 672 /* 673 * Lists nat64lsn states. 674 * Data layout (v0)(current): 675 * Request: [ ipfw_obj_header ipfw_obj_data [ uint64_t ]] 676 * Reply: [ ipfw_obj_header ipfw_obj_data [ 677 * ipfw_nat64lsn_stg ipfw_nat64lsn_state x N] ] 678 * 679 * Returns 0 on success 680 */ 681 static int 682 nat64lsn_states(struct ip_fw_chain *ch, ip_fw3_opheader *op3, 683 struct sockopt_data *sd) 684 { 685 ipfw_obj_header *oh; 686 ipfw_obj_data *od; 687 ipfw_nat64lsn_stg *stg; 688 struct nat64lsn_cfg *cfg; 689 struct nat64lsn_portgroup *pg, *pg_next; 690 uint64_t next_idx; 691 size_t sz; 692 uint32_t addr, states; 693 uint16_t port; 694 uint8_t nat_proto; 695 696 sz = sizeof(ipfw_obj_header) + sizeof(ipfw_obj_data) + 697 sizeof(uint64_t); 698 /* Check minimum header size */ 699 if (sd->valsize < sz) 700 return (EINVAL); 701 702 oh = (ipfw_obj_header *)sd->kbuf; 703 od = (ipfw_obj_data *)(oh + 1); 704 if (od->head.type != IPFW_TLV_OBJDATA || 705 od->head.length != sz - sizeof(ipfw_obj_header)) 706 return (EINVAL); 707 708 next_idx = *(uint64_t *)(od + 1); 709 /* Translate index to the request position to start from */ 710 UNPACK_IDX(next_idx, addr, nat_proto, port); 711 if (nat_proto >= NAT_MAX_PROTO) 712 return (EINVAL); 713 if (nat_proto == 0 && addr != 0) 714 return (EINVAL); 715 716 IPFW_UH_RLOCK(ch); 717 cfg = nat64lsn_find(CHAIN_TO_SRV(ch), oh->ntlv.name, oh->ntlv.set); 718 if (cfg == NULL) { 719 IPFW_UH_RUNLOCK(ch); 720 return (ESRCH); 721 } 722 /* Fill in starting point */ 723 if (addr == 0) { 724 addr = cfg->prefix4; 725 nat_proto = 1; 726 port = 0; 727 } 728 if (addr < cfg->prefix4 || addr > cfg->pmask4) { 729 IPFW_UH_RUNLOCK(ch); 730 DPRINTF(DP_GENERIC | DP_STATE, "XXX: %ju %u %u", 731 (uintmax_t)next_idx, addr, cfg->pmask4); 732 return (EINVAL); 733 } 734 735 sz = sizeof(ipfw_obj_header) + sizeof(ipfw_obj_data) + 736 sizeof(ipfw_nat64lsn_stg); 737 if (sd->valsize < sz) 738 return (ENOMEM); 739 oh = (ipfw_obj_header *)ipfw_get_sopt_space(sd, sz); 740 od = (ipfw_obj_data *)(oh + 1); 741 od->head.type = IPFW_TLV_OBJDATA; 742 od->head.length = sz - sizeof(ipfw_obj_header); 743 stg = (ipfw_nat64lsn_stg *)(od + 1); 744 745 pg = get_first_pg(cfg, &addr, &nat_proto, &port); 746 if (pg == NULL) { 747 /* No states */ 748 stg->next_idx = 0xFF; 749 stg->count = 0; 750 IPFW_UH_RUNLOCK(ch); 751 return (0); 752 } 753 states = 0; 754 pg_next = NULL; 755 while (pg != NULL) { 756 pg_next = get_next_pg(cfg, &addr, &nat_proto, &port); 757 if (pg_next == NULL) 758 stg->next_idx = 0xFF; 759 else 760 stg->next_idx = PACK_IDX(addr, nat_proto, port); 761 762 if (export_pg_states(cfg, pg, stg, sd) != 0) { 763 IPFW_UH_RUNLOCK(ch); 764 return (states == 0 ? ENOMEM: 0); 765 } 766 states += stg->count; 767 od->head.length += stg->count * sizeof(ipfw_nat64lsn_state); 768 sz += stg->count * sizeof(ipfw_nat64lsn_state); 769 if (pg_next != NULL) { 770 sz += sizeof(ipfw_nat64lsn_stg); 771 if (sd->valsize < sz) 772 break; 773 stg = (ipfw_nat64lsn_stg *)ipfw_get_sopt_space(sd, 774 sizeof(ipfw_nat64lsn_stg)); 775 } 776 pg = pg_next; 777 } 778 IPFW_UH_RUNLOCK(ch); 779 return (0); 780 } 781 782 static struct ipfw_sopt_handler scodes[] = { 783 { IP_FW_NAT64LSN_CREATE, 0, HDIR_BOTH, nat64lsn_create }, 784 { IP_FW_NAT64LSN_DESTROY,0, HDIR_SET, nat64lsn_destroy }, 785 { IP_FW_NAT64LSN_CONFIG, 0, HDIR_BOTH, nat64lsn_config }, 786 { IP_FW_NAT64LSN_LIST, 0, HDIR_GET, nat64lsn_list }, 787 { IP_FW_NAT64LSN_STATS, 0, HDIR_GET, nat64lsn_stats }, 788 { IP_FW_NAT64LSN_RESET_STATS,0, HDIR_SET, nat64lsn_reset_stats }, 789 { IP_FW_NAT64LSN_LIST_STATES,0, HDIR_GET, nat64lsn_states }, 790 }; 791 792 static int 793 nat64lsn_classify(ipfw_insn *cmd, uint16_t *puidx, uint8_t *ptype) 794 { 795 ipfw_insn *icmd; 796 797 icmd = cmd - 1; 798 if (icmd->opcode != O_EXTERNAL_ACTION || 799 icmd->arg1 != V_nat64lsn_eid) 800 return (1); 801 802 *puidx = cmd->arg1; 803 *ptype = 0; 804 return (0); 805 } 806 807 static void 808 nat64lsn_update_arg1(ipfw_insn *cmd, uint16_t idx) 809 { 810 811 cmd->arg1 = idx; 812 } 813 814 static int 815 nat64lsn_findbyname(struct ip_fw_chain *ch, struct tid_info *ti, 816 struct named_object **pno) 817 { 818 int err; 819 820 err = ipfw_objhash_find_type(CHAIN_TO_SRV(ch), ti, 821 IPFW_TLV_NAT64LSN_NAME, pno); 822 return (err); 823 } 824 825 static struct named_object * 826 nat64lsn_findbykidx(struct ip_fw_chain *ch, uint16_t idx) 827 { 828 struct namedobj_instance *ni; 829 struct named_object *no; 830 831 IPFW_UH_WLOCK_ASSERT(ch); 832 ni = CHAIN_TO_SRV(ch); 833 no = ipfw_objhash_lookup_kidx(ni, idx); 834 KASSERT(no != NULL, ("NAT64LSN with index %d not found", idx)); 835 836 return (no); 837 } 838 839 static int 840 nat64lsn_manage_sets(struct ip_fw_chain *ch, uint16_t set, uint8_t new_set, 841 enum ipfw_sets_cmd cmd) 842 { 843 844 return (ipfw_obj_manage_sets(CHAIN_TO_SRV(ch), IPFW_TLV_NAT64LSN_NAME, 845 set, new_set, cmd)); 846 } 847 848 static struct opcode_obj_rewrite opcodes[] = { 849 { 850 .opcode = O_EXTERNAL_INSTANCE, 851 .etlv = IPFW_TLV_EACTION /* just show it isn't table */, 852 .classifier = nat64lsn_classify, 853 .update = nat64lsn_update_arg1, 854 .find_byname = nat64lsn_findbyname, 855 .find_bykidx = nat64lsn_findbykidx, 856 .manage_sets = nat64lsn_manage_sets, 857 }, 858 }; 859 860 static int 861 destroy_config_cb(struct namedobj_instance *ni, struct named_object *no, 862 void *arg) 863 { 864 struct nat64lsn_cfg *cfg; 865 struct ip_fw_chain *ch; 866 867 ch = (struct ip_fw_chain *)arg; 868 cfg = (struct nat64lsn_cfg *)SRV_OBJECT(ch, no->kidx); 869 SRV_OBJECT(ch, no->kidx) = NULL; 870 nat64lsn_detach_config(ch, cfg); 871 nat64lsn_destroy_instance(cfg); 872 return (0); 873 } 874 875 int 876 nat64lsn_init(struct ip_fw_chain *ch, int first) 877 { 878 879 if (first != 0) 880 nat64lsn_init_internal(); 881 V_nat64lsn_eid = ipfw_add_eaction(ch, ipfw_nat64lsn, "nat64lsn"); 882 if (V_nat64lsn_eid == 0) 883 return (ENXIO); 884 IPFW_ADD_SOPT_HANDLER(first, scodes); 885 IPFW_ADD_OBJ_REWRITER(first, opcodes); 886 return (0); 887 } 888 889 void 890 nat64lsn_uninit(struct ip_fw_chain *ch, int last) 891 { 892 893 IPFW_DEL_OBJ_REWRITER(last, opcodes); 894 IPFW_DEL_SOPT_HANDLER(last, scodes); 895 ipfw_del_eaction(ch, V_nat64lsn_eid); 896 /* 897 * Since we already have deregistered external action, 898 * our named objects become unaccessible via rules, because 899 * all rules were truncated by ipfw_del_eaction(). 900 * So, we can unlink and destroy our named objects without holding 901 * IPFW_WLOCK(). 902 */ 903 IPFW_UH_WLOCK(ch); 904 ipfw_objhash_foreach_type(CHAIN_TO_SRV(ch), destroy_config_cb, ch, 905 IPFW_TLV_NAT64LSN_NAME); 906 V_nat64lsn_eid = 0; 907 IPFW_UH_WUNLOCK(ch); 908 if (last != 0) 909 nat64lsn_uninit_internal(); 910 } 911 912