1 /* $OpenBSD: pf_lb.c,v 1.68 2020/12/12 22:59:21 jan 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_map_addr_states_increase(sa_family_t, 101 struct pf_pool *, struct pf_addr *); 102 int pf_get_transaddr_af(struct pf_rule *, 103 struct pf_pdesc *, struct pf_src_node **); 104 int pf_map_addr_sticky(sa_family_t, struct pf_rule *, 105 struct pf_addr *, struct pf_addr *, 106 struct pf_src_node **, struct pf_pool *, 107 enum pf_sn_types); 108 109 u_int64_t 110 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 111 struct pf_poolhashkey *key, sa_family_t af) 112 { 113 uint64_t res = 0; 114 #ifdef INET6 115 union { 116 uint64_t hash64; 117 uint32_t hash32[2]; 118 } h; 119 #endif /* INET6 */ 120 121 switch (af) { 122 case AF_INET: 123 res = SipHash24((SIPHASH_KEY *)key, 124 &inaddr->addr32[0], sizeof(inaddr->addr32[0])); 125 hash->addr32[0] = res; 126 break; 127 #ifdef INET6 128 case AF_INET6: 129 res = SipHash24((SIPHASH_KEY *)key, &inaddr->addr32[0], 130 4 * sizeof(inaddr->addr32[0])); 131 h.hash64 = res; 132 hash->addr32[0] = h.hash32[0]; 133 hash->addr32[1] = h.hash32[1]; 134 /* 135 * siphash isn't big enough, but flipping it around is 136 * good enough here. 137 */ 138 hash->addr32[2] = ~h.hash32[1]; 139 hash->addr32[3] = ~h.hash32[0]; 140 break; 141 #endif /* INET6 */ 142 default: 143 unhandled_af(af); 144 } 145 return (res); 146 } 147 148 int 149 pf_get_sport(struct pf_pdesc *pd, struct pf_rule *r, 150 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 151 struct pf_src_node **sn) 152 { 153 struct pf_state_key_cmp key; 154 struct pf_addr init_addr; 155 u_int16_t cut; 156 int dir = (pd->dir == PF_IN) ? PF_OUT : PF_IN; 157 int sidx = pd->sidx; 158 int didx = pd->didx; 159 160 memset(&init_addr, 0, sizeof(init_addr)); 161 if (pf_map_addr(pd->naf, r, &pd->nsaddr, naddr, &init_addr, sn, &r->nat, 162 PF_SN_NAT)) 163 return (1); 164 165 if (pd->proto == IPPROTO_ICMP) { 166 if (pd->ndport == htons(ICMP_ECHO)) { 167 low = 1; 168 high = 65535; 169 } else 170 return (0); /* Don't try to modify non-echo ICMP */ 171 } 172 #ifdef INET6 173 if (pd->proto == IPPROTO_ICMPV6) { 174 if (pd->ndport == htons(ICMP6_ECHO_REQUEST)) { 175 low = 1; 176 high = 65535; 177 } else 178 return (0); /* Don't try to modify non-echo ICMP */ 179 } 180 #endif /* INET6 */ 181 182 do { 183 key.af = pd->naf; 184 key.proto = pd->proto; 185 key.rdomain = pd->rdomain; 186 pf_addrcpy(&key.addr[didx], &pd->ndaddr, key.af); 187 pf_addrcpy(&key.addr[sidx], naddr, key.af); 188 key.port[didx] = pd->ndport; 189 190 /* 191 * port search; start random, step; 192 * similar 2 portloop in in_pcbbind 193 */ 194 if (!(pd->proto == IPPROTO_TCP || pd->proto == IPPROTO_UDP || 195 pd->proto == IPPROTO_ICMP || pd->proto == IPPROTO_ICMPV6)) { 196 /* XXX bug: icmp states dont use the id on both 197 * XXX sides (traceroute -I through nat) */ 198 key.port[sidx] = pd->nsport; 199 if (pf_find_state_all(&key, dir, NULL) == NULL) { 200 *nport = pd->nsport; 201 return (0); 202 } 203 } else if (low == 0 && high == 0) { 204 key.port[sidx] = pd->nsport; 205 if (pf_find_state_all(&key, dir, NULL) == NULL) { 206 *nport = pd->nsport; 207 return (0); 208 } 209 } else if (low == high) { 210 key.port[sidx] = htons(low); 211 if (pf_find_state_all(&key, dir, NULL) == NULL) { 212 *nport = htons(low); 213 return (0); 214 } 215 } else { 216 u_int32_t tmp; 217 218 if (low > high) { 219 tmp = low; 220 low = high; 221 high = tmp; 222 } 223 /* low < high */ 224 cut = arc4random_uniform(1 + high - low) + low; 225 /* low <= cut <= high */ 226 for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) { 227 key.port[sidx] = htons(tmp); 228 if (pf_find_state_all(&key, dir, NULL) == 229 NULL && !in_baddynamic(tmp, pd->proto)) { 230 *nport = htons(tmp); 231 return (0); 232 } 233 } 234 tmp = cut; 235 for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) { 236 key.port[sidx] = htons(tmp); 237 if (pf_find_state_all(&key, dir, NULL) == 238 NULL && !in_baddynamic(tmp, pd->proto)) { 239 *nport = htons(tmp); 240 return (0); 241 } 242 } 243 } 244 245 switch (r->nat.opts & PF_POOL_TYPEMASK) { 246 case PF_POOL_RANDOM: 247 case PF_POOL_ROUNDROBIN: 248 case PF_POOL_LEASTSTATES: 249 /* 250 * pick a different source address since we're out 251 * of free port choices for the current one. 252 */ 253 if (pf_map_addr(pd->naf, r, &pd->nsaddr, naddr, 254 &init_addr, sn, &r->nat, PF_SN_NAT)) 255 return (1); 256 break; 257 case PF_POOL_NONE: 258 case PF_POOL_SRCHASH: 259 case PF_POOL_BITMASK: 260 default: 261 return (1); 262 } 263 } while (! PF_AEQ(&init_addr, naddr, pd->naf) ); 264 return (1); /* none available */ 265 } 266 267 int 268 pf_map_addr_sticky(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 269 struct pf_addr *naddr, struct pf_src_node **sns, struct pf_pool *rpool, 270 enum pf_sn_types type) 271 { 272 struct pf_addr *raddr, *rmask, *cached; 273 struct pf_state *s; 274 struct pf_src_node k; 275 int valid; 276 277 k.af = af; 278 k.type = type; 279 pf_addrcpy(&k.addr, saddr, af); 280 k.rule.ptr = r; 281 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 282 sns[type] = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 283 if (sns[type] == NULL) 284 return (-1); 285 286 /* check if the cached entry is still valid */ 287 cached = &(sns[type])->raddr; 288 valid = 0; 289 if (PF_AZERO(cached, af)) { 290 valid = 1; 291 } else if (rpool->addr.type == PF_ADDR_DYNIFTL) { 292 if (pfr_kentry_byaddr(rpool->addr.p.dyn->pfid_kt, cached, 293 af, 0)) 294 valid = 1; 295 } else if (rpool->addr.type == PF_ADDR_TABLE) { 296 if (pfr_kentry_byaddr(rpool->addr.p.tbl, cached, af, 0)) 297 valid = 1; 298 } else if (rpool->addr.type != PF_ADDR_NOROUTE) { 299 raddr = &rpool->addr.v.a.addr; 300 rmask = &rpool->addr.v.a.mask; 301 valid = pf_match_addr(0, raddr, rmask, cached, af); 302 } 303 if (!valid) { 304 if (pf_status.debug >= LOG_DEBUG) { 305 log(LOG_DEBUG, "pf: pf_map_addr: " 306 "stale src tracking (%u) ", type); 307 pf_print_host(&k.addr, 0, af); 308 addlog(" to "); 309 pf_print_host(cached, 0, af); 310 addlog("\n"); 311 } 312 if (sns[type]->states != 0) { 313 /* XXX expensive */ 314 RB_FOREACH(s, pf_state_tree_id, 315 &tree_id) 316 pf_state_rm_src_node(s, 317 sns[type]); 318 } 319 sns[type]->expire = 1; 320 pf_remove_src_node(sns[type]); 321 sns[type] = NULL; 322 return (-1); 323 } 324 325 326 if (!PF_AZERO(cached, af)) { 327 pf_addrcpy(naddr, cached, af); 328 if ((rpool->opts & PF_POOL_TYPEMASK) == PF_POOL_LEASTSTATES && 329 pf_map_addr_states_increase(af, rpool, cached) == -1) 330 return (-1); 331 } 332 if (pf_status.debug >= LOG_DEBUG) { 333 log(LOG_DEBUG, "pf: pf_map_addr: " 334 "src tracking (%u) maps ", type); 335 pf_print_host(&k.addr, 0, af); 336 addlog(" to "); 337 pf_print_host(naddr, 0, af); 338 addlog("\n"); 339 } 340 341 if (sns[type]->kif != NULL) 342 rpool->kif = sns[type]->kif; 343 344 return (0); 345 } 346 347 int 348 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 349 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sns, 350 struct pf_pool *rpool, enum pf_sn_types type) 351 { 352 struct pf_addr hash; 353 struct pf_addr faddr; 354 struct pf_addr *raddr = &rpool->addr.v.a.addr; 355 struct pf_addr *rmask = &rpool->addr.v.a.mask; 356 struct pfr_ktable *kt; 357 struct pfi_kif *kif; 358 u_int64_t states; 359 u_int16_t weight; 360 u_int64_t load; 361 u_int64_t cload; 362 u_int64_t hashidx; 363 int cnt; 364 365 if (sns[type] == NULL && rpool->opts & PF_POOL_STICKYADDR && 366 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE && 367 pf_map_addr_sticky(af, r, saddr, naddr, sns, rpool, type) == 0) 368 return (0); 369 370 if (rpool->addr.type == PF_ADDR_NOROUTE) 371 return (1); 372 if (rpool->addr.type == PF_ADDR_DYNIFTL) { 373 switch (af) { 374 case AF_INET: 375 if (rpool->addr.p.dyn->pfid_acnt4 < 1 && 376 !PF_POOL_DYNTYPE(rpool->opts)) 377 return (1); 378 raddr = &rpool->addr.p.dyn->pfid_addr4; 379 rmask = &rpool->addr.p.dyn->pfid_mask4; 380 break; 381 #ifdef INET6 382 case AF_INET6: 383 if (rpool->addr.p.dyn->pfid_acnt6 < 1 && 384 !PF_POOL_DYNTYPE(rpool->opts)) 385 return (1); 386 raddr = &rpool->addr.p.dyn->pfid_addr6; 387 rmask = &rpool->addr.p.dyn->pfid_mask6; 388 break; 389 #endif /* INET6 */ 390 default: 391 unhandled_af(af); 392 } 393 } else if (rpool->addr.type == PF_ADDR_TABLE) { 394 if (!PF_POOL_DYNTYPE(rpool->opts)) 395 return (1); /* unsupported */ 396 } else { 397 raddr = &rpool->addr.v.a.addr; 398 rmask = &rpool->addr.v.a.mask; 399 } 400 401 switch (rpool->opts & PF_POOL_TYPEMASK) { 402 case PF_POOL_NONE: 403 pf_addrcpy(naddr, raddr, af); 404 break; 405 case PF_POOL_BITMASK: 406 pf_poolmask(naddr, raddr, rmask, saddr, af); 407 break; 408 case PF_POOL_RANDOM: 409 if (rpool->addr.type == PF_ADDR_TABLE || 410 rpool->addr.type == PF_ADDR_DYNIFTL) { 411 if (rpool->addr.type == PF_ADDR_TABLE) 412 kt = rpool->addr.p.tbl; 413 else 414 kt = rpool->addr.p.dyn->pfid_kt; 415 kt = pfr_ktable_select_active(kt); 416 if (kt == NULL) 417 return (1); 418 419 cnt = kt->pfrkt_cnt; 420 if (cnt == 0) 421 rpool->tblidx = 0; 422 else 423 rpool->tblidx = (int)arc4random_uniform(cnt); 424 memset(&rpool->counter, 0, sizeof(rpool->counter)); 425 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 426 return (1); 427 pf_addrcpy(naddr, &rpool->counter, af); 428 } else if (init_addr != NULL && PF_AZERO(init_addr, af)) { 429 switch (af) { 430 case AF_INET: 431 rpool->counter.addr32[0] = arc4random(); 432 break; 433 #ifdef INET6 434 case AF_INET6: 435 if (rmask->addr32[3] != 0xffffffff) 436 rpool->counter.addr32[3] = arc4random(); 437 else 438 break; 439 if (rmask->addr32[2] != 0xffffffff) 440 rpool->counter.addr32[2] = arc4random(); 441 else 442 break; 443 if (rmask->addr32[1] != 0xffffffff) 444 rpool->counter.addr32[1] = arc4random(); 445 else 446 break; 447 if (rmask->addr32[0] != 0xffffffff) 448 rpool->counter.addr32[0] = arc4random(); 449 break; 450 #endif /* INET6 */ 451 default: 452 unhandled_af(af); 453 } 454 pf_poolmask(naddr, raddr, rmask, &rpool->counter, af); 455 pf_addrcpy(init_addr, naddr, af); 456 457 } else { 458 pf_addr_inc(&rpool->counter, af); 459 pf_poolmask(naddr, raddr, rmask, &rpool->counter, af); 460 } 461 break; 462 case PF_POOL_SRCHASH: 463 hashidx = pf_hash(saddr, &hash, &rpool->key, af); 464 465 if (rpool->addr.type == PF_ADDR_TABLE || 466 rpool->addr.type == PF_ADDR_DYNIFTL) { 467 if (rpool->addr.type == PF_ADDR_TABLE) 468 kt = rpool->addr.p.tbl; 469 else 470 kt = rpool->addr.p.dyn->pfid_kt; 471 kt = pfr_ktable_select_active(kt); 472 if (kt == NULL) 473 return (1); 474 475 cnt = kt->pfrkt_cnt; 476 if (cnt == 0) 477 rpool->tblidx = 0; 478 else 479 rpool->tblidx = (int)(hashidx % cnt); 480 memset(&rpool->counter, 0, sizeof(rpool->counter)); 481 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 482 return (1); 483 pf_addrcpy(naddr, &rpool->counter, af); 484 } else { 485 pf_poolmask(naddr, raddr, rmask, &hash, af); 486 } 487 break; 488 case PF_POOL_ROUNDROBIN: 489 if (rpool->addr.type == PF_ADDR_TABLE || 490 rpool->addr.type == PF_ADDR_DYNIFTL) { 491 if (pfr_pool_get(rpool, &raddr, &rmask, af)) { 492 /* 493 * reset counter in case its value 494 * has been removed from the pool. 495 */ 496 memset(&rpool->counter, 0, 497 sizeof(rpool->counter)); 498 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 499 return (1); 500 } 501 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 502 return (1); 503 504 /* iterate over table if it contains entries which are weighted */ 505 if ((rpool->addr.type == PF_ADDR_TABLE && 506 rpool->addr.p.tbl->pfrkt_refcntcost > 0) || 507 (rpool->addr.type == PF_ADDR_DYNIFTL && 508 rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0)) { 509 do { 510 if (rpool->addr.type == PF_ADDR_TABLE || 511 rpool->addr.type == PF_ADDR_DYNIFTL) { 512 if (pfr_pool_get(rpool, 513 &raddr, &rmask, af)) 514 return (1); 515 } else { 516 log(LOG_ERR, "pf: pf_map_addr: " 517 "weighted RR failure"); 518 return (1); 519 } 520 if (rpool->weight >= rpool->curweight) 521 break; 522 pf_addr_inc(&rpool->counter, af); 523 } while (1); 524 525 weight = rpool->weight; 526 } 527 528 pf_addrcpy(naddr, &rpool->counter, af); 529 if (init_addr != NULL && PF_AZERO(init_addr, af)) 530 pf_addrcpy(init_addr, naddr, af); 531 pf_addr_inc(&rpool->counter, af); 532 break; 533 case PF_POOL_LEASTSTATES: 534 /* retrieve an address first */ 535 if (rpool->addr.type == PF_ADDR_TABLE || 536 rpool->addr.type == PF_ADDR_DYNIFTL) { 537 if (pfr_pool_get(rpool, &raddr, &rmask, af)) { 538 /* see PF_POOL_ROUNDROBIN */ 539 memset(&rpool->counter, 0, 540 sizeof(rpool->counter)); 541 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 542 return (1); 543 } 544 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 545 return (1); 546 547 states = rpool->states; 548 weight = rpool->weight; 549 kif = rpool->kif; 550 551 if ((rpool->addr.type == PF_ADDR_TABLE && 552 rpool->addr.p.tbl->pfrkt_refcntcost > 0) || 553 (rpool->addr.type == PF_ADDR_DYNIFTL && 554 rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0)) 555 load = ((UINT16_MAX * rpool->states) / rpool->weight); 556 else 557 load = states; 558 559 pf_addrcpy(&faddr, &rpool->counter, af); 560 561 pf_addrcpy(naddr, &rpool->counter, af); 562 if (init_addr != NULL && PF_AZERO(init_addr, af)) 563 pf_addrcpy(init_addr, naddr, af); 564 565 /* 566 * iterate *once* over whole table and find destination with 567 * least connection 568 */ 569 do { 570 pf_addr_inc(&rpool->counter, af); 571 if (rpool->addr.type == PF_ADDR_TABLE || 572 rpool->addr.type == PF_ADDR_DYNIFTL) { 573 if (pfr_pool_get(rpool, &raddr, &rmask, af)) 574 return (1); 575 } else if (pf_match_addr(0, raddr, rmask, 576 &rpool->counter, af)) 577 return (1); 578 579 if ((rpool->addr.type == PF_ADDR_TABLE && 580 rpool->addr.p.tbl->pfrkt_refcntcost > 0) || 581 (rpool->addr.type == PF_ADDR_DYNIFTL && 582 rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0)) 583 cload = ((UINT16_MAX * rpool->states) 584 / rpool->weight); 585 else 586 cload = rpool->states; 587 588 /* find lc minimum */ 589 if (cload < load) { 590 states = rpool->states; 591 weight = rpool->weight; 592 kif = rpool->kif; 593 load = cload; 594 595 pf_addrcpy(naddr, &rpool->counter, af); 596 if (init_addr != NULL && 597 PF_AZERO(init_addr, af)) 598 pf_addrcpy(init_addr, naddr, af); 599 } 600 } while (pf_match_addr(1, &faddr, rmask, &rpool->counter, af) && 601 (states > 0)); 602 603 if (pf_map_addr_states_increase(af, rpool, naddr) == -1) 604 return (1); 605 /* revert the kif which was set by pfr_pool_get() */ 606 rpool->kif = kif; 607 break; 608 } 609 610 if (rpool->opts & PF_POOL_STICKYADDR) { 611 if (sns[type] != NULL) { 612 pf_remove_src_node(sns[type]); 613 sns[type] = NULL; 614 } 615 if (pf_insert_src_node(&sns[type], r, type, af, saddr, naddr, 616 rpool->kif)) 617 return (1); 618 } 619 620 if (pf_status.debug >= LOG_INFO && 621 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 622 log(LOG_INFO, "pf: pf_map_addr: selected address "); 623 pf_print_host(naddr, 0, af); 624 if ((rpool->opts & PF_POOL_TYPEMASK) == 625 PF_POOL_LEASTSTATES) 626 addlog(" with state count %llu", states); 627 if ((rpool->addr.type == PF_ADDR_TABLE && 628 rpool->addr.p.tbl->pfrkt_refcntcost > 0) || 629 (rpool->addr.type == PF_ADDR_DYNIFTL && 630 rpool->addr.p.dyn->pfid_kt->pfrkt_refcntcost > 0)) 631 addlog(" with weight %u", weight); 632 addlog("\n"); 633 } 634 635 return (0); 636 } 637 638 int 639 pf_map_addr_states_increase(sa_family_t af, struct pf_pool *rpool, 640 struct pf_addr *naddr) 641 { 642 if (rpool->addr.type == PF_ADDR_TABLE) { 643 if (pfr_states_increase(rpool->addr.p.tbl, 644 naddr, af) == -1) { 645 if (pf_status.debug >= LOG_DEBUG) { 646 log(LOG_DEBUG, 647 "pf: pf_map_addr_states_increase: " 648 "selected address "); 649 pf_print_host(naddr, 0, af); 650 addlog(". Failed to increase count!\n"); 651 } 652 return (-1); 653 } 654 } else if (rpool->addr.type == PF_ADDR_DYNIFTL) { 655 if (pfr_states_increase(rpool->addr.p.dyn->pfid_kt, 656 naddr, af) == -1) { 657 if (pf_status.debug >= LOG_DEBUG) { 658 log(LOG_DEBUG, 659 "pf: pf_map_addr_states_increase: " 660 "selected address "); 661 pf_print_host(naddr, 0, af); 662 addlog(". Failed to increase count!\n"); 663 } 664 return (-1); 665 } 666 } 667 return (0); 668 } 669 670 int 671 pf_get_transaddr(struct pf_rule *r, struct pf_pdesc *pd, 672 struct pf_src_node **sns, struct pf_rule **nr) 673 { 674 struct pf_addr naddr; 675 u_int16_t nport; 676 677 #ifdef INET6 678 if (pd->af != pd->naf) 679 return (pf_get_transaddr_af(r, pd, sns)); 680 #endif /* INET6 */ 681 682 if (r->nat.addr.type != PF_ADDR_NONE) { 683 /* XXX is this right? what if rtable is changed at the same 684 * XXX time? where do I need to figure out the sport? */ 685 nport = 0; 686 if (pf_get_sport(pd, r, &naddr, &nport, 687 r->nat.proxy_port[0], r->nat.proxy_port[1], sns)) { 688 DPFPRINTF(LOG_NOTICE, 689 "pf: NAT proxy port allocation (%u-%u) failed", 690 r->nat.proxy_port[0], 691 r->nat.proxy_port[1]); 692 return (-1); 693 } 694 *nr = r; 695 pf_addrcpy(&pd->nsaddr, &naddr, pd->af); 696 pd->nsport = nport; 697 } 698 if (r->rdr.addr.type != PF_ADDR_NONE) { 699 if (pf_map_addr(pd->af, r, &pd->nsaddr, &naddr, NULL, sns, 700 &r->rdr, PF_SN_RDR)) 701 return (-1); 702 if ((r->rdr.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK) 703 pf_poolmask(&naddr, &naddr, &r->rdr.addr.v.a.mask, 704 &pd->ndaddr, pd->af); 705 706 nport = 0; 707 if (r->rdr.proxy_port[1]) { 708 u_int32_t tmp_nport; 709 710 tmp_nport = ((ntohs(pd->ndport) - 711 ntohs(r->dst.port[0])) % 712 (r->rdr.proxy_port[1] - 713 r->rdr.proxy_port[0] + 1)) + 714 r->rdr.proxy_port[0]; 715 716 /* wrap around if necessary */ 717 if (tmp_nport > 65535) 718 tmp_nport -= 65535; 719 nport = htons((u_int16_t)tmp_nport); 720 } else if (r->rdr.proxy_port[0]) 721 nport = htons(r->rdr.proxy_port[0]); 722 *nr = r; 723 pf_addrcpy(&pd->ndaddr, &naddr, pd->af); 724 if (nport) 725 pd->ndport = nport; 726 } 727 728 return (0); 729 } 730 731 #ifdef INET6 732 int 733 pf_get_transaddr_af(struct pf_rule *r, struct pf_pdesc *pd, 734 struct pf_src_node **sns) 735 { 736 struct pf_addr ndaddr, nsaddr, naddr; 737 u_int16_t nport; 738 int prefixlen = 96; 739 740 if (pf_status.debug >= LOG_INFO) { 741 log(LOG_INFO, "pf: af-to %s %s, ", 742 pd->naf == AF_INET ? "inet" : "inet6", 743 r->rdr.addr.type == PF_ADDR_NONE ? "nat" : "rdr"); 744 pf_print_host(&pd->nsaddr, pd->nsport, pd->af); 745 addlog(" -> "); 746 pf_print_host(&pd->ndaddr, pd->ndport, pd->af); 747 addlog("\n"); 748 } 749 750 if (r->nat.addr.type == PF_ADDR_NONE) 751 panic("pf_get_transaddr_af: no nat pool for source address"); 752 753 /* get source address and port */ 754 nport = 0; 755 if (pf_get_sport(pd, r, &nsaddr, &nport, 756 r->nat.proxy_port[0], r->nat.proxy_port[1], sns)) { 757 DPFPRINTF(LOG_NOTICE, 758 "pf: af-to NAT proxy port allocation (%u-%u) failed", 759 r->nat.proxy_port[0], 760 r->nat.proxy_port[1]); 761 return (-1); 762 } 763 pd->nsport = nport; 764 765 if (pd->proto == IPPROTO_ICMPV6 && pd->naf == AF_INET) { 766 if (pd->dir == PF_IN) { 767 pd->ndport = ntohs(pd->ndport); 768 if (pd->ndport == ICMP6_ECHO_REQUEST) 769 pd->ndport = ICMP_ECHO; 770 else if (pd->ndport == ICMP6_ECHO_REPLY) 771 pd->ndport = ICMP_ECHOREPLY; 772 pd->ndport = htons(pd->ndport); 773 } else { 774 pd->nsport = ntohs(pd->nsport); 775 if (pd->nsport == ICMP6_ECHO_REQUEST) 776 pd->nsport = ICMP_ECHO; 777 else if (pd->nsport == ICMP6_ECHO_REPLY) 778 pd->nsport = ICMP_ECHOREPLY; 779 pd->nsport = htons(pd->nsport); 780 } 781 } else if (pd->proto == IPPROTO_ICMP && pd->naf == AF_INET6) { 782 if (pd->dir == PF_IN) { 783 pd->ndport = ntohs(pd->ndport); 784 if (pd->ndport == ICMP_ECHO) 785 pd->ndport = ICMP6_ECHO_REQUEST; 786 else if (pd->ndport == ICMP_ECHOREPLY) 787 pd->ndport = ICMP6_ECHO_REPLY; 788 pd->ndport = htons(pd->ndport); 789 } else { 790 pd->nsport = ntohs(pd->nsport); 791 if (pd->nsport == ICMP_ECHO) 792 pd->nsport = ICMP6_ECHO_REQUEST; 793 else if (pd->nsport == ICMP_ECHOREPLY) 794 pd->nsport = ICMP6_ECHO_REPLY; 795 pd->nsport = htons(pd->nsport); 796 } 797 } 798 799 /* get the destination address and port */ 800 if (r->rdr.addr.type != PF_ADDR_NONE) { 801 if (pf_map_addr(pd->naf, r, &nsaddr, &naddr, NULL, sns, 802 &r->rdr, PF_SN_RDR)) 803 return (-1); 804 if (r->rdr.proxy_port[0]) 805 pd->ndport = htons(r->rdr.proxy_port[0]); 806 807 if (pd->naf == AF_INET) { 808 /* The prefix is the IPv4 rdr address */ 809 prefixlen = in_mask2len((struct in_addr *) 810 &r->rdr.addr.v.a.mask); 811 inet_nat46(pd->naf, &pd->ndaddr, 812 &ndaddr, &naddr, prefixlen); 813 } else { 814 /* The prefix is the IPv6 rdr address */ 815 prefixlen = 816 in6_mask2len((struct in6_addr *) 817 &r->rdr.addr.v.a.mask, NULL); 818 inet_nat64(pd->naf, &pd->ndaddr, 819 &ndaddr, &naddr, prefixlen); 820 } 821 } else { 822 if (pd->naf == AF_INET) { 823 /* The prefix is the IPv6 dst address */ 824 prefixlen = 825 in6_mask2len((struct in6_addr *) 826 &r->dst.addr.v.a.mask, NULL); 827 if (prefixlen < 32) 828 prefixlen = 96; 829 inet_nat64(pd->naf, &pd->ndaddr, 830 &ndaddr, &pd->ndaddr, prefixlen); 831 } else { 832 /* 833 * The prefix is the IPv6 nat address 834 * (that was stored in pd->nsaddr) 835 */ 836 prefixlen = in6_mask2len((struct in6_addr *) 837 &r->nat.addr.v.a.mask, NULL); 838 if (prefixlen > 96) 839 prefixlen = 96; 840 inet_nat64(pd->naf, &pd->ndaddr, 841 &ndaddr, &nsaddr, prefixlen); 842 } 843 } 844 845 pf_addrcpy(&pd->nsaddr, &nsaddr, pd->naf); 846 pf_addrcpy(&pd->ndaddr, &ndaddr, pd->naf); 847 848 if (pf_status.debug >= LOG_INFO) { 849 log(LOG_INFO, "pf: af-to %s %s done, prefixlen %d, ", 850 pd->naf == AF_INET ? "inet" : "inet6", 851 r->rdr.addr.type == PF_ADDR_NONE ? "nat" : "rdr", 852 prefixlen); 853 pf_print_host(&pd->nsaddr, pd->nsport, pd->naf); 854 addlog(" -> "); 855 pf_print_host(&pd->ndaddr, pd->ndport, pd->naf); 856 addlog("\n"); 857 } 858 859 return (0); 860 } 861 #endif /* INET6 */ 862 863 int 864 pf_postprocess_addr(struct pf_state *cur) 865 { 866 struct pf_rule *nr; 867 struct pf_state_key *sks; 868 struct pf_pool rpool; 869 struct pf_addr lookup_addr; 870 int slbcount = -1; 871 872 nr = cur->natrule.ptr; 873 874 if (nr == NULL) 875 return (0); 876 877 /* decrease counter */ 878 879 sks = cur->key[PF_SK_STACK]; 880 881 /* check for outgoing or ingoing balancing */ 882 if (nr->rt == PF_ROUTETO) 883 lookup_addr = cur->rt_addr; 884 else if (sks != NULL) 885 lookup_addr = sks->addr[1]; 886 else { 887 if (pf_status.debug >= LOG_DEBUG) { 888 log(LOG_DEBUG, "pf: %s: unable to obtain address", 889 __func__); 890 } 891 return (1); 892 } 893 894 /* check for appropriate pool */ 895 if (nr->rdr.addr.type != PF_ADDR_NONE) 896 rpool = nr->rdr; 897 else if (nr->nat.addr.type != PF_ADDR_NONE) 898 rpool = nr->nat; 899 else if (nr->route.addr.type != PF_ADDR_NONE) 900 rpool = nr->route; 901 else 902 return (0); 903 904 if (((rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_LEASTSTATES)) 905 return (0); 906 907 if (rpool.addr.type == PF_ADDR_TABLE) { 908 if ((slbcount = pfr_states_decrease( 909 rpool.addr.p.tbl, 910 &lookup_addr, sks->af)) == -1) { 911 if (pf_status.debug >= LOG_DEBUG) { 912 log(LOG_DEBUG, "pf: %s: selected address ", 913 __func__); 914 pf_print_host(&lookup_addr, 915 sks->port[0], sks->af); 916 addlog(". Failed to " 917 "decrease count!\n"); 918 } 919 return (1); 920 } 921 } else if (rpool.addr.type == PF_ADDR_DYNIFTL) { 922 if ((slbcount = pfr_states_decrease( 923 rpool.addr.p.dyn->pfid_kt, 924 &lookup_addr, sks->af)) == -1) { 925 if (pf_status.debug >= LOG_DEBUG) { 926 log(LOG_DEBUG, "pf: %s: selected address ", 927 __func__); 928 pf_print_host(&lookup_addr, 929 sks->port[0], sks->af); 930 addlog(". Failed to " 931 "decrease count!\n"); 932 } 933 return (1); 934 } 935 } 936 if (slbcount > -1) { 937 if (pf_status.debug >= LOG_INFO) { 938 log(LOG_INFO, "pf: %s: selected address ", __func__); 939 pf_print_host(&lookup_addr, sks->port[0], 940 sks->af); 941 addlog(" decreased state count to %u\n", 942 slbcount); 943 } 944 } 945 return (0); 946 } 947