1 /* $OpenBSD: pf_lb.c,v 1.63 2018/12/10 16:48:15 kn Exp $ */ 2 3 /* 4 * Copyright (c) 2001 Daniel Hartmeier 5 * Copyright (c) 2002 - 2008 Henning Brauer 6 * All rights reserved. 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 * - Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * - Redistributions in binary form must reproduce the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer in the documentation and/or other materials provided 17 * with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 27 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 29 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 * 32 * Effort sponsored in part by the Defense Advanced Research Projects 33 * Agency (DARPA) and Air Force Research Laboratory, Air Force 34 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 35 * 36 */ 37 38 #include "bpfilter.h" 39 #include "pflog.h" 40 #include "pfsync.h" 41 #include "pflow.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/mbuf.h> 46 #include <sys/filio.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/kernel.h> 50 #include <sys/time.h> 51 #include <sys/pool.h> 52 #include <sys/rwlock.h> 53 #include <sys/syslog.h> 54 #include <sys/stdint.h> 55 56 #include <crypto/siphash.h> 57 58 #include <net/if.h> 59 #include <net/bpf.h> 60 #include <net/route.h> 61 62 #include <netinet/in.h> 63 #include <netinet/ip.h> 64 #include <netinet/in_pcb.h> 65 #include <netinet/ip_var.h> 66 #include <netinet/ip_icmp.h> 67 #include <netinet/icmp_var.h> 68 #include <netinet/tcp.h> 69 #include <netinet/tcp_seq.h> 70 #include <netinet/tcp_timer.h> 71 #include <netinet/udp.h> 72 #include <netinet/udp_var.h> 73 #include <netinet/if_ether.h> 74 75 #ifdef INET6 76 #include <netinet/ip6.h> 77 #include <netinet/icmp6.h> 78 #endif /* INET6 */ 79 80 #include <net/pfvar.h> 81 #include <net/pfvar_priv.h> 82 83 #if NPFLOG > 0 84 #include <net/if_pflog.h> 85 #endif /* NPFLOG > 0 */ 86 87 #if NPFLOW > 0 88 #include <net/if_pflow.h> 89 #endif /* NPFLOW > 0 */ 90 91 #if NPFSYNC > 0 92 #include <net/if_pfsync.h> 93 #endif /* NPFSYNC > 0 */ 94 95 u_int64_t pf_hash(struct pf_addr *, struct pf_addr *, 96 struct pf_poolhashkey *, sa_family_t); 97 int pf_get_sport(struct pf_pdesc *, struct pf_rule *, 98 struct pf_addr *, u_int16_t *, u_int16_t, 99 u_int16_t, struct pf_src_node **); 100 int pf_get_transaddr_af(struct pf_rule *, 101 struct pf_pdesc *, struct pf_src_node **); 102 int pf_map_addr_sticky(sa_family_t, struct pf_rule *, 103 struct pf_addr *, struct pf_addr *, 104 struct pf_src_node **, struct pf_pool *, 105 enum pf_sn_types); 106 107 u_int64_t 108 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 109 struct pf_poolhashkey *key, sa_family_t af) 110 { 111 uint64_t res = 0; 112 #ifdef INET6 113 union { 114 uint64_t hash64; 115 uint32_t hash32[2]; 116 } h; 117 #endif /* INET6 */ 118 119 switch (af) { 120 case AF_INET: 121 res = SipHash24((SIPHASH_KEY *)key, 122 &inaddr->addr32[0], sizeof(inaddr->addr32[0])); 123 hash->addr32[0] = res; 124 break; 125 #ifdef INET6 126 case AF_INET6: 127 res = SipHash24((SIPHASH_KEY *)key, &inaddr->addr32[0], 128 4 * sizeof(inaddr->addr32[0])); 129 h.hash64 = res; 130 hash->addr32[0] = h.hash32[0]; 131 hash->addr32[1] = h.hash32[1]; 132 /* 133 * siphash isn't big enough, but flipping it around is 134 * good enough here. 135 */ 136 hash->addr32[2] = ~h.hash32[1]; 137 hash->addr32[3] = ~h.hash32[0]; 138 break; 139 #endif /* INET6 */ 140 default: 141 unhandled_af(af); 142 } 143 return (res); 144 } 145 146 int 147 pf_get_sport(struct pf_pdesc *pd, struct pf_rule *r, 148 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 149 struct pf_src_node **sn) 150 { 151 struct pf_state_key_cmp key; 152 struct pf_addr init_addr; 153 u_int16_t cut; 154 int dir = (pd->dir == PF_IN) ? PF_OUT : PF_IN; 155 int sidx = pd->sidx; 156 int didx = pd->didx; 157 158 memset(&init_addr, 0, sizeof(init_addr)); 159 if (pf_map_addr(pd->naf, r, &pd->nsaddr, naddr, &init_addr, sn, &r->nat, 160 PF_SN_NAT)) 161 return (1); 162 163 if (pd->proto == IPPROTO_ICMP) { 164 if (pd->ndport == htons(ICMP_ECHO)) { 165 low = 1; 166 high = 65535; 167 } else 168 return (0); /* Don't try to modify non-echo ICMP */ 169 } 170 #ifdef INET6 171 if (pd->proto == IPPROTO_ICMPV6) { 172 if (pd->ndport == htons(ICMP6_ECHO_REQUEST)) { 173 low = 1; 174 high = 65535; 175 } else 176 return (0); /* Don't try to modify non-echo ICMP */ 177 } 178 #endif /* INET6 */ 179 180 do { 181 key.af = pd->naf; 182 key.proto = pd->proto; 183 key.rdomain = pd->rdomain; 184 pf_addrcpy(&key.addr[didx], &pd->ndaddr, key.af); 185 pf_addrcpy(&key.addr[sidx], naddr, key.af); 186 key.port[didx] = pd->ndport; 187 188 /* 189 * port search; start random, step; 190 * similar 2 portloop in in_pcbbind 191 */ 192 if (!(pd->proto == IPPROTO_TCP || pd->proto == IPPROTO_UDP || 193 pd->proto == IPPROTO_ICMP || pd->proto == IPPROTO_ICMPV6)) { 194 /* XXX bug: icmp states dont use the id on both 195 * XXX sides (traceroute -I through nat) */ 196 key.port[sidx] = pd->nsport; 197 if (pf_find_state_all(&key, dir, NULL) == NULL) { 198 *nport = pd->nsport; 199 return (0); 200 } 201 } else if (low == 0 && high == 0) { 202 key.port[sidx] = pd->nsport; 203 if (pf_find_state_all(&key, dir, NULL) == NULL) { 204 *nport = pd->nsport; 205 return (0); 206 } 207 } else if (low == high) { 208 key.port[sidx] = htons(low); 209 if (pf_find_state_all(&key, dir, NULL) == NULL) { 210 *nport = htons(low); 211 return (0); 212 } 213 } else { 214 u_int32_t tmp; 215 216 if (low > high) { 217 tmp = low; 218 low = high; 219 high = tmp; 220 } 221 /* low < high */ 222 cut = arc4random_uniform(1 + high - low) + low; 223 /* low <= cut <= high */ 224 for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) { 225 key.port[sidx] = htons(tmp); 226 if (pf_find_state_all(&key, dir, NULL) == 227 NULL && !in_baddynamic(tmp, pd->proto)) { 228 *nport = htons(tmp); 229 return (0); 230 } 231 } 232 tmp = cut; 233 for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) { 234 key.port[sidx] = htons(tmp); 235 if (pf_find_state_all(&key, dir, NULL) == 236 NULL && !in_baddynamic(tmp, pd->proto)) { 237 *nport = htons(tmp); 238 return (0); 239 } 240 } 241 } 242 243 switch (r->nat.opts & PF_POOL_TYPEMASK) { 244 case PF_POOL_RANDOM: 245 case PF_POOL_ROUNDROBIN: 246 case PF_POOL_LEASTSTATES: 247 /* 248 * pick a different source address since we're out 249 * of free port choices for the current one. 250 */ 251 if (pf_map_addr(pd->naf, r, &pd->nsaddr, naddr, 252 &init_addr, sn, &r->nat, PF_SN_NAT)) 253 return (1); 254 break; 255 case PF_POOL_NONE: 256 case PF_POOL_SRCHASH: 257 case PF_POOL_BITMASK: 258 default: 259 return (1); 260 } 261 } while (! PF_AEQ(&init_addr, naddr, pd->naf) ); 262 return (1); /* none available */ 263 } 264 265 int 266 pf_map_addr_sticky(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 267 struct pf_addr *naddr, struct pf_src_node **sns, struct pf_pool *rpool, 268 enum pf_sn_types type) 269 { 270 struct pf_addr *raddr, *rmask, *cached; 271 struct pf_state *s; 272 struct pf_src_node k; 273 int valid; 274 275 k.af = af; 276 k.type = type; 277 pf_addrcpy(&k.addr, saddr, af); 278 k.rule.ptr = r; 279 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 280 sns[type] = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 281 if (sns[type] == NULL) 282 return (-1); 283 284 /* check if the cached entry is still valid */ 285 cached = &(sns[type])->raddr; 286 valid = 0; 287 if (PF_AZERO(cached, af)) { 288 valid = 1; 289 } else if (rpool->addr.type == PF_ADDR_DYNIFTL) { 290 if (pfr_kentry_byaddr(rpool->addr.p.dyn->pfid_kt, cached, 291 af, 0)) 292 valid = 1; 293 } else if (rpool->addr.type == PF_ADDR_TABLE) { 294 if (pfr_kentry_byaddr(rpool->addr.p.tbl, cached, af, 0)) 295 valid = 1; 296 } else if (rpool->addr.type != PF_ADDR_NOROUTE) { 297 raddr = &rpool->addr.v.a.addr; 298 rmask = &rpool->addr.v.a.mask; 299 valid = pf_match_addr(0, raddr, rmask, cached, af); 300 } 301 if (!valid) { 302 if (pf_status.debug >= LOG_DEBUG) { 303 log(LOG_DEBUG, "pf: pf_map_addr: " 304 "stale src tracking (%u) ", type); 305 pf_print_host(&k.addr, 0, af); 306 addlog(" to "); 307 pf_print_host(cached, 0, af); 308 addlog("\n"); 309 } 310 if (sns[type]->states != 0) { 311 /* XXX expensive */ 312 RB_FOREACH(s, pf_state_tree_id, 313 &tree_id) 314 pf_state_rm_src_node(s, 315 sns[type]); 316 } 317 sns[type]->expire = 1; 318 pf_remove_src_node(sns[type]); 319 sns[type] = NULL; 320 return (-1); 321 } 322 if (!PF_AZERO(cached, af)) 323 pf_addrcpy(naddr, cached, af); 324 if (pf_status.debug >= LOG_DEBUG) { 325 log(LOG_DEBUG, "pf: pf_map_addr: " 326 "src tracking (%u) maps ", type); 327 pf_print_host(&k.addr, 0, af); 328 addlog(" to "); 329 pf_print_host(naddr, 0, af); 330 addlog("\n"); 331 } 332 return (0); 333 } 334 335 int 336 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 337 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sns, 338 struct pf_pool *rpool, enum pf_sn_types type) 339 { 340 unsigned char hash[16]; 341 struct pf_addr faddr; 342 struct pf_addr *raddr = &rpool->addr.v.a.addr; 343 struct pf_addr *rmask = &rpool->addr.v.a.mask; 344 u_int64_t states; 345 u_int16_t weight; 346 u_int64_t load; 347 u_int64_t cload; 348 u_int64_t hashidx; 349 int cnt; 350 351 if (sns[type] == NULL && rpool->opts & PF_POOL_STICKYADDR && 352 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE && 353 pf_map_addr_sticky(af, r, saddr, naddr, sns, rpool, type) == 0) 354 return (0); 355 356 if (rpool->addr.type == PF_ADDR_NOROUTE) 357 return (1); 358 if (rpool->addr.type == PF_ADDR_DYNIFTL) { 359 switch (af) { 360 case AF_INET: 361 if (rpool->addr.p.dyn->pfid_acnt4 < 1 && 362 !PF_POOL_DYNTYPE(rpool->opts)) 363 return (1); 364 raddr = &rpool->addr.p.dyn->pfid_addr4; 365 rmask = &rpool->addr.p.dyn->pfid_mask4; 366 break; 367 #ifdef INET6 368 case AF_INET6: 369 if (rpool->addr.p.dyn->pfid_acnt6 < 1 && 370 !PF_POOL_DYNTYPE(rpool->opts)) 371 return (1); 372 raddr = &rpool->addr.p.dyn->pfid_addr6; 373 rmask = &rpool->addr.p.dyn->pfid_mask6; 374 break; 375 #endif /* INET6 */ 376 default: 377 unhandled_af(af); 378 } 379 } else if (rpool->addr.type == PF_ADDR_TABLE) { 380 if (!PF_POOL_DYNTYPE(rpool->opts)) 381 return (1); /* unsupported */ 382 } else { 383 raddr = &rpool->addr.v.a.addr; 384 rmask = &rpool->addr.v.a.mask; 385 } 386 387 switch (rpool->opts & PF_POOL_TYPEMASK) { 388 case PF_POOL_NONE: 389 pf_addrcpy(naddr, raddr, af); 390 break; 391 case PF_POOL_BITMASK: 392 pf_poolmask(naddr, raddr, rmask, saddr, af); 393 break; 394 case PF_POOL_RANDOM: 395 if (rpool->addr.type == PF_ADDR_TABLE) { 396 cnt = rpool->addr.p.tbl->pfrkt_cnt; 397 if (cnt == 0) 398 rpool->tblidx = 0; 399 else 400 rpool->tblidx = (int)arc4random_uniform(cnt); 401 memset(&rpool->counter, 0, sizeof(rpool->counter)); 402 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 403 return (1); 404 pf_addrcpy(naddr, &rpool->counter, af); 405 } else if (rpool->addr.type == PF_ADDR_DYNIFTL) { 406 cnt = rpool->addr.p.dyn->pfid_kt->pfrkt_cnt; 407 if (cnt == 0) 408 rpool->tblidx = 0; 409 else 410 rpool->tblidx = (int)arc4random_uniform(cnt); 411 memset(&rpool->counter, 0, sizeof(rpool->counter)); 412 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 413 return (1); 414 pf_addrcpy(naddr, &rpool->counter, af); 415 } else if (init_addr != NULL && PF_AZERO(init_addr, af)) { 416 switch (af) { 417 case AF_INET: 418 rpool->counter.addr32[0] = arc4random(); 419 break; 420 #ifdef INET6 421 case AF_INET6: 422 if (rmask->addr32[3] != 0xffffffff) 423 rpool->counter.addr32[3] = arc4random(); 424 else 425 break; 426 if (rmask->addr32[2] != 0xffffffff) 427 rpool->counter.addr32[2] = arc4random(); 428 else 429 break; 430 if (rmask->addr32[1] != 0xffffffff) 431 rpool->counter.addr32[1] = arc4random(); 432 else 433 break; 434 if (rmask->addr32[0] != 0xffffffff) 435 rpool->counter.addr32[0] = arc4random(); 436 break; 437 #endif /* INET6 */ 438 default: 439 unhandled_af(af); 440 } 441 pf_poolmask(naddr, raddr, rmask, &rpool->counter, af); 442 pf_addrcpy(init_addr, naddr, af); 443 444 } else { 445 pf_addr_inc(&rpool->counter, af); 446 pf_poolmask(naddr, raddr, rmask, &rpool->counter, af); 447 } 448 break; 449 case PF_POOL_SRCHASH: 450 hashidx = 451 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 452 if (rpool->addr.type == PF_ADDR_TABLE) { 453 cnt = rpool->addr.p.tbl->pfrkt_cnt; 454 if (cnt == 0) 455 rpool->tblidx = 0; 456 else 457 rpool->tblidx = (int)(hashidx % cnt); 458 memset(&rpool->counter, 0, sizeof(rpool->counter)); 459 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 460 return (1); 461 pf_addrcpy(naddr, &rpool->counter, af); 462 } else if (rpool->addr.type == PF_ADDR_DYNIFTL) { 463 cnt = rpool->addr.p.dyn->pfid_kt->pfrkt_cnt; 464 if (cnt == 0) 465 rpool->tblidx = 0; 466 else 467 rpool->tblidx = (int)(hashidx % cnt); 468 memset(&rpool->counter, 0, sizeof(rpool->counter)); 469 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 470 return (1); 471 pf_addrcpy(naddr, &rpool->counter, af); 472 } else { 473 pf_poolmask(naddr, raddr, rmask, 474 (struct pf_addr *)&hash, af); 475 } 476 break; 477 case PF_POOL_ROUNDROBIN: 478 if (rpool->addr.type == PF_ADDR_TABLE || 479 rpool->addr.type == PF_ADDR_DYNIFTL) { 480 if (pfr_pool_get(rpool, &raddr, &rmask, af)) { 481 /* 482 * reset counter in case its value 483 * has been removed from the pool. 484 */ 485 memset(&rpool->counter, 0, 486 sizeof(rpool->counter)); 487 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 488 return (1); 489 } 490 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 491 return (1); 492 493 /* iterate over table if it contains entries which are weighted */ 494 if ((rpool->addr.type == PF_ADDR_TABLE && 495 rpool->addr.p.tbl->pfrkt_refcntcost > 0) || 496 (rpool->addr.type == PF_ADDR_DYNIFTL && 497 rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0)) { 498 do { 499 if (rpool->addr.type == PF_ADDR_TABLE || 500 rpool->addr.type == PF_ADDR_DYNIFTL) { 501 if (pfr_pool_get(rpool, 502 &raddr, &rmask, af)) 503 return (1); 504 } else { 505 log(LOG_ERR, "pf: pf_map_addr: " 506 "weighted RR failure"); 507 return (1); 508 } 509 if (rpool->weight >= rpool->curweight) 510 break; 511 pf_addr_inc(&rpool->counter, af); 512 } while (1); 513 514 weight = rpool->weight; 515 } 516 517 pf_addrcpy(naddr, &rpool->counter, af); 518 if (init_addr != NULL && PF_AZERO(init_addr, af)) 519 pf_addrcpy(init_addr, naddr, af); 520 pf_addr_inc(&rpool->counter, af); 521 break; 522 case PF_POOL_LEASTSTATES: 523 /* retrieve an address first */ 524 if (rpool->addr.type == PF_ADDR_TABLE || 525 rpool->addr.type == PF_ADDR_DYNIFTL) { 526 if (pfr_pool_get(rpool, &raddr, &rmask, af)) { 527 /* see PF_POOL_ROUNDROBIN */ 528 memset(&rpool->counter, 0, 529 sizeof(rpool->counter)); 530 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 531 return (1); 532 } 533 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 534 return (1); 535 536 states = rpool->states; 537 weight = rpool->weight; 538 539 if ((rpool->addr.type == PF_ADDR_TABLE && 540 rpool->addr.p.tbl->pfrkt_refcntcost > 0) || 541 (rpool->addr.type == PF_ADDR_DYNIFTL && 542 rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0)) 543 load = ((UINT16_MAX * rpool->states) / rpool->weight); 544 else 545 load = states; 546 547 pf_addrcpy(&faddr, &rpool->counter, af); 548 549 pf_addrcpy(naddr, &rpool->counter, af); 550 if (init_addr != NULL && PF_AZERO(init_addr, af)) 551 pf_addrcpy(init_addr, naddr, af); 552 553 /* 554 * iterate *once* over whole table and find destination with 555 * least connection 556 */ 557 do { 558 pf_addr_inc(&rpool->counter, af); 559 if (rpool->addr.type == PF_ADDR_TABLE || 560 rpool->addr.type == PF_ADDR_DYNIFTL) { 561 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 562 return (1); 563 } else if (pf_match_addr(0, raddr, rmask, 564 &rpool->counter, af)) 565 return (1); 566 567 if ((rpool->addr.type == PF_ADDR_TABLE && 568 rpool->addr.p.tbl->pfrkt_refcntcost > 0) || 569 (rpool->addr.type == PF_ADDR_DYNIFTL && 570 rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0)) 571 cload = ((UINT16_MAX * rpool->states) 572 / rpool->weight); 573 else 574 cload = rpool->states; 575 576 /* find lc minimum */ 577 if (cload < load) { 578 states = rpool->states; 579 weight = rpool->weight; 580 load = cload; 581 582 pf_addrcpy(naddr, &rpool->counter, af); 583 if (init_addr != NULL && 584 PF_AZERO(init_addr, af)) 585 pf_addrcpy(init_addr, naddr, af); 586 } 587 } while (pf_match_addr(1, &faddr, rmask, &rpool->counter, af) && 588 (states > 0)); 589 590 if (rpool->addr.type == PF_ADDR_TABLE) { 591 if (pfr_states_increase(rpool->addr.p.tbl, 592 naddr, af) == -1) { 593 if (pf_status.debug >= LOG_DEBUG) { 594 log(LOG_DEBUG,"pf: pf_map_addr: " 595 "selected address "); 596 pf_print_host(naddr, 0, af); 597 addlog(". Failed to increase count!\n"); 598 } 599 return (1); 600 } 601 } else if (rpool->addr.type == PF_ADDR_DYNIFTL) { 602 if (pfr_states_increase(rpool->addr.p.dyn->pfid_kt, 603 naddr, af) == -1) { 604 if (pf_status.debug >= LOG_DEBUG) { 605 log(LOG_DEBUG, "pf: pf_map_addr: " 606 "selected address "); 607 pf_print_host(naddr, 0, af); 608 addlog(". Failed to increase count!\n"); 609 } 610 return (1); 611 } 612 } 613 break; 614 } 615 616 if (rpool->opts & PF_POOL_STICKYADDR) { 617 if (sns[type] != NULL) { 618 pf_remove_src_node(sns[type]); 619 sns[type] = NULL; 620 } 621 if (pf_insert_src_node(&sns[type], r, type, af, saddr, naddr)) 622 return (1); 623 } 624 625 if (pf_status.debug >= LOG_INFO && 626 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 627 log(LOG_INFO, "pf: pf_map_addr: selected address "); 628 pf_print_host(naddr, 0, af); 629 if ((rpool->opts & PF_POOL_TYPEMASK) == 630 PF_POOL_LEASTSTATES) 631 addlog(" with state count %llu", states); 632 if ((rpool->addr.type == PF_ADDR_TABLE && 633 rpool->addr.p.tbl->pfrkt_refcntcost > 0) || 634 (rpool->addr.type == PF_ADDR_DYNIFTL && 635 rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0)) 636 addlog(" with weight %u", weight); 637 addlog("\n"); 638 } 639 640 return (0); 641 } 642 643 int 644 pf_get_transaddr(struct pf_rule *r, struct pf_pdesc *pd, 645 struct pf_src_node **sns, struct pf_rule **nr) 646 { 647 struct pf_addr naddr; 648 u_int16_t nport; 649 650 #ifdef INET6 651 if (pd->af != pd->naf) 652 return (pf_get_transaddr_af(r, pd, sns)); 653 #endif /* INET6 */ 654 655 if (r->nat.addr.type != PF_ADDR_NONE) { 656 /* XXX is this right? what if rtable is changed at the same 657 * XXX time? where do I need to figure out the sport? */ 658 nport = 0; 659 if (pf_get_sport(pd, r, &naddr, &nport, 660 r->nat.proxy_port[0], r->nat.proxy_port[1], sns)) { 661 DPFPRINTF(LOG_NOTICE, 662 "pf: NAT proxy port allocation (%u-%u) failed", 663 r->nat.proxy_port[0], 664 r->nat.proxy_port[1]); 665 return (-1); 666 } 667 *nr = r; 668 pf_addrcpy(&pd->nsaddr, &naddr, pd->af); 669 pd->nsport = nport; 670 } 671 if (r->rdr.addr.type != PF_ADDR_NONE) { 672 if (pf_map_addr(pd->af, r, &pd->nsaddr, &naddr, NULL, sns, 673 &r->rdr, PF_SN_RDR)) 674 return (-1); 675 if ((r->rdr.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK) 676 pf_poolmask(&naddr, &naddr, &r->rdr.addr.v.a.mask, 677 &pd->ndaddr, pd->af); 678 679 nport = 0; 680 if (r->rdr.proxy_port[1]) { 681 u_int32_t tmp_nport; 682 683 tmp_nport = ((ntohs(pd->ndport) - 684 ntohs(r->dst.port[0])) % 685 (r->rdr.proxy_port[1] - 686 r->rdr.proxy_port[0] + 1)) + 687 r->rdr.proxy_port[0]; 688 689 /* wrap around if necessary */ 690 if (tmp_nport > 65535) 691 tmp_nport -= 65535; 692 nport = htons((u_int16_t)tmp_nport); 693 } else if (r->rdr.proxy_port[0]) 694 nport = htons(r->rdr.proxy_port[0]); 695 *nr = r; 696 pf_addrcpy(&pd->ndaddr, &naddr, pd->af); 697 if (nport) 698 pd->ndport = nport; 699 } 700 701 return (0); 702 } 703 704 #ifdef INET6 705 int 706 pf_get_transaddr_af(struct pf_rule *r, struct pf_pdesc *pd, 707 struct pf_src_node **sns) 708 { 709 struct pf_addr ndaddr, nsaddr, naddr; 710 u_int16_t nport; 711 int prefixlen = 96; 712 713 if (pf_status.debug >= LOG_INFO) { 714 log(LOG_INFO, "pf: af-to %s %s, ", 715 pd->naf == AF_INET ? "inet" : "inet6", 716 r->rdr.addr.type == PF_ADDR_NONE ? "nat" : "rdr"); 717 pf_print_host(&pd->nsaddr, pd->nsport, pd->af); 718 addlog(" -> "); 719 pf_print_host(&pd->ndaddr, pd->ndport, pd->af); 720 addlog("\n"); 721 } 722 723 if (r->nat.addr.type == PF_ADDR_NONE) 724 panic("pf_get_transaddr_af: no nat pool for source address"); 725 726 /* get source address and port */ 727 nport = 0; 728 if (pf_get_sport(pd, r, &nsaddr, &nport, 729 r->nat.proxy_port[0], r->nat.proxy_port[1], sns)) { 730 DPFPRINTF(LOG_NOTICE, 731 "pf: af-to NAT proxy port allocation (%u-%u) failed", 732 r->nat.proxy_port[0], 733 r->nat.proxy_port[1]); 734 return (-1); 735 } 736 pd->nsport = nport; 737 738 if (pd->proto == IPPROTO_ICMPV6 && pd->naf == AF_INET) { 739 if (pd->dir == PF_IN) { 740 pd->ndport = ntohs(pd->ndport); 741 if (pd->ndport == ICMP6_ECHO_REQUEST) 742 pd->ndport = ICMP_ECHO; 743 else if (pd->ndport == ICMP6_ECHO_REPLY) 744 pd->ndport = ICMP_ECHOREPLY; 745 pd->ndport = htons(pd->ndport); 746 } else { 747 pd->nsport = ntohs(pd->nsport); 748 if (pd->nsport == ICMP6_ECHO_REQUEST) 749 pd->nsport = ICMP_ECHO; 750 else if (pd->nsport == ICMP6_ECHO_REPLY) 751 pd->nsport = ICMP_ECHOREPLY; 752 pd->nsport = htons(pd->nsport); 753 } 754 } else if (pd->proto == IPPROTO_ICMP && pd->naf == AF_INET6) { 755 if (pd->dir == PF_IN) { 756 pd->ndport = ntohs(pd->ndport); 757 if (pd->ndport == ICMP_ECHO) 758 pd->ndport = ICMP6_ECHO_REQUEST; 759 else if (pd->ndport == ICMP_ECHOREPLY) 760 pd->ndport = ICMP6_ECHO_REPLY; 761 pd->ndport = htons(pd->ndport); 762 } else { 763 pd->nsport = ntohs(pd->nsport); 764 if (pd->nsport == ICMP_ECHO) 765 pd->nsport = ICMP6_ECHO_REQUEST; 766 else if (pd->nsport == ICMP_ECHOREPLY) 767 pd->nsport = ICMP6_ECHO_REPLY; 768 pd->nsport = htons(pd->nsport); 769 } 770 } 771 772 /* get the destination address and port */ 773 if (r->rdr.addr.type != PF_ADDR_NONE) { 774 if (pf_map_addr(pd->naf, r, &nsaddr, &naddr, NULL, sns, 775 &r->rdr, PF_SN_RDR)) 776 return (-1); 777 if (r->rdr.proxy_port[0]) 778 pd->ndport = htons(r->rdr.proxy_port[0]); 779 780 if (pd->naf == AF_INET) { 781 /* The prefix is the IPv4 rdr address */ 782 prefixlen = in_mask2len((struct in_addr *) 783 &r->rdr.addr.v.a.mask); 784 inet_nat46(pd->naf, &pd->ndaddr, 785 &ndaddr, &naddr, prefixlen); 786 } else { 787 /* The prefix is the IPv6 rdr address */ 788 prefixlen = 789 in6_mask2len((struct in6_addr *) 790 &r->rdr.addr.v.a.mask, NULL); 791 inet_nat64(pd->naf, &pd->ndaddr, 792 &ndaddr, &naddr, prefixlen); 793 } 794 } else { 795 if (pd->naf == AF_INET) { 796 /* The prefix is the IPv6 dst address */ 797 prefixlen = 798 in6_mask2len((struct in6_addr *) 799 &r->dst.addr.v.a.mask, NULL); 800 if (prefixlen < 32) 801 prefixlen = 96; 802 inet_nat64(pd->naf, &pd->ndaddr, 803 &ndaddr, &pd->ndaddr, prefixlen); 804 } else { 805 /* 806 * The prefix is the IPv6 nat address 807 * (that was stored in pd->nsaddr) 808 */ 809 prefixlen = in6_mask2len((struct in6_addr *) 810 &r->nat.addr.v.a.mask, NULL); 811 if (prefixlen > 96) 812 prefixlen = 96; 813 inet_nat64(pd->naf, &pd->ndaddr, 814 &ndaddr, &nsaddr, prefixlen); 815 } 816 } 817 818 pf_addrcpy(&pd->nsaddr, &nsaddr, pd->naf); 819 pf_addrcpy(&pd->ndaddr, &ndaddr, pd->naf); 820 821 if (pf_status.debug >= LOG_INFO) { 822 log(LOG_INFO, "pf: af-to %s %s done, prefixlen %d, ", 823 pd->naf == AF_INET ? "inet" : "inet6", 824 r->rdr.addr.type == PF_ADDR_NONE ? "nat" : "rdr", 825 prefixlen); 826 pf_print_host(&pd->nsaddr, pd->nsport, pd->naf); 827 addlog(" -> "); 828 pf_print_host(&pd->ndaddr, pd->ndport, pd->naf); 829 addlog("\n"); 830 } 831 832 return (0); 833 } 834 #endif /* INET6 */ 835 836 int 837 pf_postprocess_addr(struct pf_state *cur) 838 { 839 struct pf_rule *nr; 840 struct pf_state_key *sks; 841 struct pf_pool rpool; 842 struct pf_addr lookup_addr; 843 int slbcount = -1; 844 845 nr = cur->natrule.ptr; 846 847 if (nr == NULL) 848 return (0); 849 850 /* decrease counter */ 851 852 sks = cur->key[PF_SK_STACK]; 853 854 /* check for outgoing or ingoing balancing */ 855 if (nr->rt == PF_ROUTETO) 856 lookup_addr = cur->rt_addr; 857 else if (sks != NULL) 858 lookup_addr = sks->addr[1]; 859 else { 860 if (pf_status.debug >= LOG_DEBUG) { 861 log(LOG_DEBUG, "pf: %s: unable to obtain address", 862 __func__); 863 } 864 return (1); 865 } 866 867 /* check for appropriate pool */ 868 if (nr->rdr.addr.type != PF_ADDR_NONE) 869 rpool = nr->rdr; 870 else if (nr->nat.addr.type != PF_ADDR_NONE) 871 rpool = nr->nat; 872 else if (nr->route.addr.type != PF_ADDR_NONE) 873 rpool = nr->route; 874 else 875 return (0); 876 877 if (((rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_LEASTSTATES)) 878 return (0); 879 880 if (rpool.addr.type == PF_ADDR_TABLE) { 881 if ((slbcount = pfr_states_decrease( 882 rpool.addr.p.tbl, 883 &lookup_addr, sks->af)) == -1) { 884 if (pf_status.debug >= LOG_DEBUG) { 885 log(LOG_DEBUG, "pf: %s: selected address ", 886 __func__); 887 pf_print_host(&lookup_addr, 888 sks->port[0], sks->af); 889 addlog(". Failed to " 890 "decrease count!\n"); 891 } 892 return (1); 893 } 894 } else if (rpool.addr.type == PF_ADDR_DYNIFTL) { 895 if ((slbcount = pfr_states_decrease( 896 rpool.addr.p.dyn->pfid_kt, 897 &lookup_addr, sks->af)) == -1) { 898 if (pf_status.debug >= LOG_DEBUG) { 899 log(LOG_DEBUG, "pf: %s: selected address ", 900 __func__); 901 pf_print_host(&lookup_addr, 902 sks->port[0], sks->af); 903 addlog(". Failed to " 904 "decrease count!\n"); 905 } 906 return (1); 907 } 908 } 909 if (slbcount > -1) { 910 if (pf_status.debug >= LOG_INFO) { 911 log(LOG_INFO, "pf: %s: selected address ", __func__); 912 pf_print_host(&lookup_addr, sks->port[0], 913 sks->af); 914 addlog(" decreased state count to %u\n", 915 slbcount); 916 } 917 } 918 return (0); 919 } 920