1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 * $OpenBSD: pf_lb.c,v 1.2 2009/02/12 02:13:15 sthen Exp $ 37 */ 38 39#include <sys/cdefs.h> 40#include "opt_pf.h" 41#include "opt_inet.h" 42#include "opt_inet6.h" 43 44#include <sys/param.h> 45#include <sys/lock.h> 46#include <sys/mbuf.h> 47#include <sys/socket.h> 48#include <sys/sysctl.h> 49 50#include <net/if.h> 51#include <net/vnet.h> 52#include <net/pfvar.h> 53#include <net/if_pflog.h> 54 55#define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 56 57static void pf_hash(struct pf_addr *, struct pf_addr *, 58 struct pf_poolhashkey *, sa_family_t); 59static struct pf_krule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 60 int, struct pfi_kkif *, 61 struct pf_addr *, u_int16_t, struct pf_addr *, 62 uint16_t, int, struct pf_kanchor_stackframe *); 63static int pf_get_sport(sa_family_t, uint8_t, struct pf_krule *, 64 struct pf_addr *, uint16_t, struct pf_addr *, uint16_t, struct pf_addr *, 65 uint16_t *, uint16_t, uint16_t, struct pf_ksrc_node **); 66 67#define mix(a,b,c) \ 68 do { \ 69 a -= b; a -= c; a ^= (c >> 13); \ 70 b -= c; b -= a; b ^= (a << 8); \ 71 c -= a; c -= b; c ^= (b >> 13); \ 72 a -= b; a -= c; a ^= (c >> 12); \ 73 b -= c; b -= a; b ^= (a << 16); \ 74 c -= a; c -= b; c ^= (b >> 5); \ 75 a -= b; a -= c; a ^= (c >> 3); \ 76 b -= c; b -= a; b ^= (a << 10); \ 77 c -= a; c -= b; c ^= (b >> 15); \ 78 } while (0) 79 80/* 81 * hash function based on bridge_hash in if_bridge.c 82 */ 83static void 84pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 85 struct pf_poolhashkey *key, sa_family_t af) 86{ 87 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 88 89 switch (af) { 90#ifdef INET 91 case AF_INET: 92 a += inaddr->addr32[0]; 93 b += key->key32[1]; 94 mix(a, b, c); 95 hash->addr32[0] = c + key->key32[2]; 96 break; 97#endif /* INET */ 98#ifdef INET6 99 case AF_INET6: 100 a += inaddr->addr32[0]; 101 b += inaddr->addr32[2]; 102 mix(a, b, c); 103 hash->addr32[0] = c; 104 a += inaddr->addr32[1]; 105 b += inaddr->addr32[3]; 106 c += key->key32[1]; 107 mix(a, b, c); 108 hash->addr32[1] = c; 109 a += inaddr->addr32[2]; 110 b += inaddr->addr32[1]; 111 c += key->key32[2]; 112 mix(a, b, c); 113 hash->addr32[2] = c; 114 a += inaddr->addr32[3]; 115 b += inaddr->addr32[0]; 116 c += key->key32[3]; 117 mix(a, b, c); 118 hash->addr32[3] = c; 119 break; 120#endif /* INET6 */ 121 } 122} 123 124static struct pf_krule * 125pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 126 struct pfi_kkif *kif, struct pf_addr *saddr, u_int16_t sport, 127 struct pf_addr *daddr, uint16_t dport, int rs_num, 128 struct pf_kanchor_stackframe *anchor_stack) 129{ 130 struct pf_krule *r, *rm = NULL; 131 struct pf_kruleset *ruleset = NULL; 132 int tag = -1; 133 int rtableid = -1; 134 int asd = 0; 135 136 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 137 while (r != NULL) { 138 struct pf_rule_addr *src = NULL, *dst = NULL; 139 struct pf_addr_wrap *xdst = NULL; 140 141 if (r->action == PF_BINAT && pd->dir == PF_IN) { 142 src = &r->dst; 143 if (r->rpool.cur != NULL) 144 xdst = &r->rpool.cur->addr; 145 } else { 146 src = &r->src; 147 dst = &r->dst; 148 } 149 150 pf_counter_u64_add(&r->evaluations, 1); 151 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 152 r = r->skip[PF_SKIP_IFP].ptr; 153 else if (r->direction && r->direction != pd->dir) 154 r = r->skip[PF_SKIP_DIR].ptr; 155 else if (r->af && r->af != pd->af) 156 r = r->skip[PF_SKIP_AF].ptr; 157 else if (r->proto && r->proto != pd->proto) 158 r = r->skip[PF_SKIP_PROTO].ptr; 159 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 160 src->neg, kif, M_GETFIB(m))) 161 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 162 PF_SKIP_DST_ADDR].ptr; 163 else if (src->port_op && !pf_match_port(src->port_op, 164 src->port[0], src->port[1], sport)) 165 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 166 PF_SKIP_DST_PORT].ptr; 167 else if (dst != NULL && 168 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL, 169 M_GETFIB(m))) 170 r = r->skip[PF_SKIP_DST_ADDR].ptr; 171 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 172 0, NULL, M_GETFIB(m))) 173 r = TAILQ_NEXT(r, entries); 174 else if (dst != NULL && dst->port_op && 175 !pf_match_port(dst->port_op, dst->port[0], 176 dst->port[1], dport)) 177 r = r->skip[PF_SKIP_DST_PORT].ptr; 178 else if (r->match_tag && !pf_match_tag(m, r, &tag, 179 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 180 r = TAILQ_NEXT(r, entries); 181 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 182 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 183 off, &pd->hdr.tcp), r->os_fingerprint))) 184 r = TAILQ_NEXT(r, entries); 185 else { 186 if (r->tag) 187 tag = r->tag; 188 if (r->rtableid >= 0) 189 rtableid = r->rtableid; 190 if (r->anchor == NULL) { 191 rm = r; 192 if (rm->action == PF_NONAT || 193 rm->action == PF_NORDR || 194 rm->action == PF_NOBINAT) { 195 rm = NULL; 196 } 197 break; 198 } else 199 pf_step_into_anchor(anchor_stack, &asd, 200 &ruleset, rs_num, &r, NULL, NULL); 201 } 202 if (r == NULL) 203 pf_step_out_of_anchor(anchor_stack, &asd, &ruleset, 204 rs_num, &r, NULL, NULL); 205 } 206 207 if (tag > 0 && pf_tag_packet(m, pd, tag)) 208 return (NULL); 209 if (rtableid >= 0) 210 M_SETFIB(m, rtableid); 211 212 return (rm); 213} 214 215static int 216pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_krule *r, 217 struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr, 218 uint16_t dport, struct pf_addr *naddr, uint16_t *nport, uint16_t low, 219 uint16_t high, struct pf_ksrc_node **sn) 220{ 221 struct pf_state_key_cmp key; 222 struct pf_addr init_addr; 223 224 bzero(&init_addr, sizeof(init_addr)); 225 if (pf_map_addr(af, r, saddr, naddr, NULL, &init_addr, sn)) 226 return (1); 227 228 bzero(&key, sizeof(key)); 229 key.af = af; 230 key.proto = proto; 231 key.port[0] = dport; 232 PF_ACPY(&key.addr[0], daddr, key.af); 233 234 do { 235 PF_ACPY(&key.addr[1], naddr, key.af); 236 237 /* 238 * port search; start random, step; 239 * similar 2 portloop in in_pcbbind 240 */ 241 if (proto == IPPROTO_SCTP) { 242 key.port[1] = sport; 243 if (!pf_find_state_all_exists(&key, PF_IN)) { 244 *nport = sport; 245 return (0); 246 } else { 247 return (1); /* Fail mapping. */ 248 } 249 } else if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 250 proto == IPPROTO_ICMP) || (low == 0 && high == 0)) { 251 /* 252 * XXX bug: icmp states don't use the id on both sides. 253 * (traceroute -I through nat) 254 */ 255 key.port[1] = sport; 256 if (!pf_find_state_all_exists(&key, PF_IN)) { 257 *nport = sport; 258 return (0); 259 } 260 } else if (low == high) { 261 key.port[1] = htons(low); 262 if (!pf_find_state_all_exists(&key, PF_IN)) { 263 *nport = htons(low); 264 return (0); 265 } 266 } else { 267 uint32_t tmp; 268 uint16_t cut; 269 270 if (low > high) { 271 tmp = low; 272 low = high; 273 high = tmp; 274 } 275 /* low < high */ 276 cut = arc4random() % (1 + high - low) + low; 277 /* low <= cut <= high */ 278 for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) { 279 key.port[1] = htons(tmp); 280 if (!pf_find_state_all_exists(&key, PF_IN)) { 281 *nport = htons(tmp); 282 return (0); 283 } 284 } 285 tmp = cut; 286 for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) { 287 key.port[1] = htons(tmp); 288 if (!pf_find_state_all_exists(&key, PF_IN)) { 289 *nport = htons(tmp); 290 return (0); 291 } 292 } 293 } 294 295 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 296 case PF_POOL_RANDOM: 297 case PF_POOL_ROUNDROBIN: 298 /* 299 * pick a different source address since we're out 300 * of free port choices for the current one. 301 */ 302 if (pf_map_addr(af, r, saddr, naddr, NULL, &init_addr, sn)) 303 return (1); 304 break; 305 case PF_POOL_NONE: 306 case PF_POOL_SRCHASH: 307 case PF_POOL_BITMASK: 308 default: 309 return (1); 310 } 311 } while (! PF_AEQ(&init_addr, naddr, af) ); 312 return (1); /* none available */ 313} 314 315static int 316pf_get_mape_sport(sa_family_t af, u_int8_t proto, struct pf_krule *r, 317 struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr, 318 uint16_t dport, struct pf_addr *naddr, uint16_t *nport, 319 struct pf_ksrc_node **sn) 320{ 321 uint16_t psmask, low, highmask; 322 uint16_t i, ahigh, cut; 323 int ashift, psidshift; 324 325 ashift = 16 - r->rpool.mape.offset; 326 psidshift = ashift - r->rpool.mape.psidlen; 327 psmask = r->rpool.mape.psid & ((1U << r->rpool.mape.psidlen) - 1); 328 psmask = psmask << psidshift; 329 highmask = (1U << psidshift) - 1; 330 331 ahigh = (1U << r->rpool.mape.offset) - 1; 332 cut = arc4random() & ahigh; 333 if (cut == 0) 334 cut = 1; 335 336 for (i = cut; i <= ahigh; i++) { 337 low = (i << ashift) | psmask; 338 if (!pf_get_sport(af, proto, r, saddr, sport, daddr, dport, 339 naddr, nport, low, low | highmask, sn)) 340 return (0); 341 } 342 for (i = cut - 1; i > 0; i--) { 343 low = (i << ashift) | psmask; 344 if (!pf_get_sport(af, proto, r, saddr, sport, daddr, dport, 345 naddr, nport, low, low | highmask, sn)) 346 return (0); 347 } 348 return (1); 349} 350 351u_short 352pf_map_addr(sa_family_t af, struct pf_krule *r, struct pf_addr *saddr, 353 struct pf_addr *naddr, struct pfi_kkif **nkif, struct pf_addr *init_addr, 354 struct pf_ksrc_node **sn) 355{ 356 u_short reason = 0; 357 struct pf_kpool *rpool = &r->rpool; 358 struct pf_addr *raddr = NULL, *rmask = NULL; 359 struct pf_srchash *sh = NULL; 360 361 /* Try to find a src_node if none was given and this 362 is a sticky-address rule. */ 363 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 364 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) 365 *sn = pf_find_src_node(saddr, r, af, &sh, false); 366 367 /* If a src_node was found or explicitly given and it has a non-zero 368 route address, use this address. A zeroed address is found if the 369 src node was created just a moment ago in pf_create_state and it 370 needs to be filled in with routing decision calculated here. */ 371 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 372 /* If the supplied address is the same as the current one we've 373 * been asked before, so tell the caller that there's no other 374 * address to be had. */ 375 if (PF_AEQ(naddr, &(*sn)->raddr, af)) { 376 reason = PFRES_MAPFAILED; 377 goto done; 378 } 379 380 PF_ACPY(naddr, &(*sn)->raddr, af); 381 if (nkif) 382 *nkif = (*sn)->rkif; 383 if (V_pf_status.debug >= PF_DEBUG_NOISY) { 384 printf("pf_map_addr: src tracking maps "); 385 pf_print_host(saddr, 0, af); 386 printf(" to "); 387 pf_print_host(naddr, 0, af); 388 if (nkif) 389 printf("@%s", (*nkif)->pfik_name); 390 printf("\n"); 391 } 392 goto done; 393 } 394 395 mtx_lock(&rpool->mtx); 396 /* Find the route using chosen algorithm. Store the found route 397 in src_node if it was given or found. */ 398 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) { 399 reason = PFRES_MAPFAILED; 400 goto done_pool_mtx; 401 } 402 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 403 switch (af) { 404#ifdef INET 405 case AF_INET: 406 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 407 (rpool->opts & PF_POOL_TYPEMASK) != 408 PF_POOL_ROUNDROBIN) { 409 reason = PFRES_MAPFAILED; 410 goto done_pool_mtx; 411 } 412 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 413 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 414 break; 415#endif /* INET */ 416#ifdef INET6 417 case AF_INET6: 418 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 419 (rpool->opts & PF_POOL_TYPEMASK) != 420 PF_POOL_ROUNDROBIN) { 421 reason = PFRES_MAPFAILED; 422 goto done_pool_mtx; 423 } 424 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 425 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 426 break; 427#endif /* INET6 */ 428 } 429 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 430 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) { 431 reason = PFRES_MAPFAILED; 432 goto done_pool_mtx; /* unsupported */ 433 } 434 } else { 435 raddr = &rpool->cur->addr.v.a.addr; 436 rmask = &rpool->cur->addr.v.a.mask; 437 } 438 439 switch (rpool->opts & PF_POOL_TYPEMASK) { 440 case PF_POOL_NONE: 441 PF_ACPY(naddr, raddr, af); 442 break; 443 case PF_POOL_BITMASK: 444 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 445 break; 446 case PF_POOL_RANDOM: 447 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 448 switch (af) { 449#ifdef INET 450 case AF_INET: 451 rpool->counter.addr32[0] = htonl(arc4random()); 452 break; 453#endif /* INET */ 454#ifdef INET6 455 case AF_INET6: 456 if (rmask->addr32[3] != 0xffffffff) 457 rpool->counter.addr32[3] = 458 htonl(arc4random()); 459 else 460 break; 461 if (rmask->addr32[2] != 0xffffffff) 462 rpool->counter.addr32[2] = 463 htonl(arc4random()); 464 else 465 break; 466 if (rmask->addr32[1] != 0xffffffff) 467 rpool->counter.addr32[1] = 468 htonl(arc4random()); 469 else 470 break; 471 if (rmask->addr32[0] != 0xffffffff) 472 rpool->counter.addr32[0] = 473 htonl(arc4random()); 474 break; 475#endif /* INET6 */ 476 } 477 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 478 PF_ACPY(init_addr, naddr, af); 479 480 } else { 481 PF_AINC(&rpool->counter, af); 482 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 483 } 484 break; 485 case PF_POOL_SRCHASH: 486 { 487 unsigned char hash[16]; 488 489 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 490 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 491 break; 492 } 493 case PF_POOL_ROUNDROBIN: 494 { 495 struct pf_kpooladdr *acur = rpool->cur; 496 497 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 498 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 499 &rpool->tblidx, &rpool->counter, af)) 500 goto get_addr; 501 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 502 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 503 &rpool->tblidx, &rpool->counter, af)) 504 goto get_addr; 505 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 506 goto get_addr; 507 508 try_next: 509 if (TAILQ_NEXT(rpool->cur, entries) == NULL) 510 rpool->cur = TAILQ_FIRST(&rpool->list); 511 else 512 rpool->cur = TAILQ_NEXT(rpool->cur, entries); 513 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 514 rpool->tblidx = -1; 515 if (pfr_pool_get(rpool->cur->addr.p.tbl, 516 &rpool->tblidx, &rpool->counter, af)) { 517 /* table contains no address of type 'af' */ 518 if (rpool->cur != acur) 519 goto try_next; 520 reason = PFRES_MAPFAILED; 521 goto done_pool_mtx; 522 } 523 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 524 rpool->tblidx = -1; 525 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 526 &rpool->tblidx, &rpool->counter, af)) { 527 /* table contains no address of type 'af' */ 528 if (rpool->cur != acur) 529 goto try_next; 530 reason = PFRES_MAPFAILED; 531 goto done_pool_mtx; 532 } 533 } else { 534 raddr = &rpool->cur->addr.v.a.addr; 535 rmask = &rpool->cur->addr.v.a.mask; 536 PF_ACPY(&rpool->counter, raddr, af); 537 } 538 539 get_addr: 540 PF_ACPY(naddr, &rpool->counter, af); 541 if (init_addr != NULL && PF_AZERO(init_addr, af)) 542 PF_ACPY(init_addr, naddr, af); 543 PF_AINC(&rpool->counter, af); 544 break; 545 } 546 } 547 548 if (nkif) 549 *nkif = rpool->cur->kif; 550 551 if (*sn != NULL) { 552 PF_ACPY(&(*sn)->raddr, naddr, af); 553 if (nkif) 554 (*sn)->rkif = *nkif; 555 } 556 557 if (V_pf_status.debug >= PF_DEBUG_NOISY && 558 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 559 printf("pf_map_addr: selected address "); 560 pf_print_host(naddr, 0, af); 561 if (nkif) 562 printf("@%s", (*nkif)->pfik_name); 563 printf("\n"); 564 } 565 566done_pool_mtx: 567 mtx_unlock(&rpool->mtx); 568 569done: 570 if (reason) { 571 counter_u64_add(V_pf_status.counters[reason], 1); 572 } 573 574 return (reason); 575} 576 577struct pf_krule * 578pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 579 struct pfi_kkif *kif, struct pf_ksrc_node **sn, 580 struct pf_state_key **skp, struct pf_state_key **nkp, 581 struct pf_addr *saddr, struct pf_addr *daddr, 582 uint16_t sport, uint16_t dport, struct pf_kanchor_stackframe *anchor_stack) 583{ 584 struct pf_krule *r = NULL; 585 struct pf_addr *naddr; 586 uint16_t *nport; 587 uint16_t low, high; 588 589 PF_RULES_RASSERT(); 590 KASSERT(*skp == NULL, ("*skp not NULL")); 591 KASSERT(*nkp == NULL, ("*nkp not NULL")); 592 593 if (pd->dir == PF_OUT) { 594 r = pf_match_translation(pd, m, off, kif, saddr, 595 sport, daddr, dport, PF_RULESET_BINAT, anchor_stack); 596 if (r == NULL) 597 r = pf_match_translation(pd, m, off, kif, 598 saddr, sport, daddr, dport, PF_RULESET_NAT, 599 anchor_stack); 600 } else { 601 r = pf_match_translation(pd, m, off, kif, saddr, 602 sport, daddr, dport, PF_RULESET_RDR, anchor_stack); 603 if (r == NULL) 604 r = pf_match_translation(pd, m, off, kif, 605 saddr, sport, daddr, dport, PF_RULESET_BINAT, 606 anchor_stack); 607 } 608 609 if (r == NULL) 610 return (NULL); 611 612 switch (r->action) { 613 case PF_NONAT: 614 case PF_NOBINAT: 615 case PF_NORDR: 616 return (NULL); 617 } 618 619 *skp = pf_state_key_setup(pd, saddr, daddr, sport, dport); 620 if (*skp == NULL) 621 return (NULL); 622 *nkp = pf_state_key_clone(*skp); 623 if (*nkp == NULL) { 624 uma_zfree(V_pf_state_key_z, *skp); 625 *skp = NULL; 626 return (NULL); 627 } 628 629 /* XXX We only modify one side for now. */ 630 naddr = &(*nkp)->addr[1]; 631 nport = &(*nkp)->port[1]; 632 633 switch (r->action) { 634 case PF_NAT: 635 if (pd->proto == IPPROTO_ICMP) { 636 low = 1; 637 high = 65535; 638 } else { 639 low = r->rpool.proxy_port[0]; 640 high = r->rpool.proxy_port[1]; 641 } 642 if (r->rpool.mape.offset > 0) { 643 if (pf_get_mape_sport(pd->af, pd->proto, r, saddr, 644 sport, daddr, dport, naddr, nport, sn)) { 645 DPFPRINTF(PF_DEBUG_MISC, 646 ("pf: MAP-E port allocation (%u/%u/%u)" 647 " failed\n", 648 r->rpool.mape.offset, 649 r->rpool.mape.psidlen, 650 r->rpool.mape.psid)); 651 goto notrans; 652 } 653 } else if (pf_get_sport(pd->af, pd->proto, r, saddr, sport, 654 daddr, dport, naddr, nport, low, high, sn)) { 655 DPFPRINTF(PF_DEBUG_MISC, 656 ("pf: NAT proxy port allocation (%u-%u) failed\n", 657 r->rpool.proxy_port[0], r->rpool.proxy_port[1])); 658 goto notrans; 659 } 660 break; 661 case PF_BINAT: 662 switch (pd->dir) { 663 case PF_OUT: 664 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 665 switch (pd->af) { 666#ifdef INET 667 case AF_INET: 668 if (r->rpool.cur->addr.p.dyn-> 669 pfid_acnt4 < 1) 670 goto notrans; 671 PF_POOLMASK(naddr, 672 &r->rpool.cur->addr.p.dyn-> 673 pfid_addr4, 674 &r->rpool.cur->addr.p.dyn-> 675 pfid_mask4, saddr, AF_INET); 676 break; 677#endif /* INET */ 678#ifdef INET6 679 case AF_INET6: 680 if (r->rpool.cur->addr.p.dyn-> 681 pfid_acnt6 < 1) 682 goto notrans; 683 PF_POOLMASK(naddr, 684 &r->rpool.cur->addr.p.dyn-> 685 pfid_addr6, 686 &r->rpool.cur->addr.p.dyn-> 687 pfid_mask6, saddr, AF_INET6); 688 break; 689#endif /* INET6 */ 690 } 691 } else 692 PF_POOLMASK(naddr, 693 &r->rpool.cur->addr.v.a.addr, 694 &r->rpool.cur->addr.v.a.mask, saddr, 695 pd->af); 696 break; 697 case PF_IN: 698 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 699 switch (pd->af) { 700#ifdef INET 701 case AF_INET: 702 if (r->src.addr.p.dyn-> pfid_acnt4 < 1) 703 goto notrans; 704 PF_POOLMASK(naddr, 705 &r->src.addr.p.dyn->pfid_addr4, 706 &r->src.addr.p.dyn->pfid_mask4, 707 daddr, AF_INET); 708 break; 709#endif /* INET */ 710#ifdef INET6 711 case AF_INET6: 712 if (r->src.addr.p.dyn->pfid_acnt6 < 1) 713 goto notrans; 714 PF_POOLMASK(naddr, 715 &r->src.addr.p.dyn->pfid_addr6, 716 &r->src.addr.p.dyn->pfid_mask6, 717 daddr, AF_INET6); 718 break; 719#endif /* INET6 */ 720 } 721 } else 722 PF_POOLMASK(naddr, &r->src.addr.v.a.addr, 723 &r->src.addr.v.a.mask, daddr, pd->af); 724 break; 725 } 726 break; 727 case PF_RDR: { 728 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, NULL, sn)) 729 goto notrans; 730 if ((r->rpool.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK) 731 PF_POOLMASK(naddr, naddr, &r->rpool.cur->addr.v.a.mask, 732 daddr, pd->af); 733 734 /* Do not change SCTP ports. */ 735 if (pd->proto == IPPROTO_SCTP) 736 break; 737 738 if (r->rpool.proxy_port[1]) { 739 uint32_t tmp_nport; 740 741 tmp_nport = ((ntohs(dport) - ntohs(r->dst.port[0])) % 742 (r->rpool.proxy_port[1] - r->rpool.proxy_port[0] + 743 1)) + r->rpool.proxy_port[0]; 744 745 /* Wrap around if necessary. */ 746 if (tmp_nport > 65535) 747 tmp_nport -= 65535; 748 *nport = htons((uint16_t)tmp_nport); 749 } else if (r->rpool.proxy_port[0]) 750 *nport = htons(r->rpool.proxy_port[0]); 751 break; 752 } 753 default: 754 panic("%s: unknown action %u", __func__, r->action); 755 } 756 757 /* Return success only if translation really happened. */ 758 if (bcmp(*skp, *nkp, sizeof(struct pf_state_key_cmp))) 759 return (r); 760 761notrans: 762 uma_zfree(V_pf_state_key_z, *nkp); 763 uma_zfree(V_pf_state_key_z, *skp); 764 *skp = *nkp = NULL; 765 *sn = NULL; 766 767 return (NULL); 768} 769