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 __FBSDID("$FreeBSD$"); 41 42 #include "opt_pf.h" 43 #include "opt_inet.h" 44 #include "opt_inet6.h" 45 46 #include <sys/param.h> 47 #include <sys/lock.h> 48 #include <sys/mbuf.h> 49 #include <sys/socket.h> 50 #include <sys/sysctl.h> 51 52 #include <net/if.h> 53 #include <net/vnet.h> 54 #include <net/pfvar.h> 55 #include <net/if_pflog.h> 56 57 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 58 59 static void pf_hash(struct pf_addr *, struct pf_addr *, 60 struct pf_poolhashkey *, sa_family_t); 61 static struct pf_krule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 62 int, int, struct pfi_kkif *, 63 struct pf_addr *, u_int16_t, struct pf_addr *, 64 uint16_t, int, struct pf_kanchor_stackframe *); 65 static int pf_get_sport(sa_family_t, uint8_t, struct pf_krule *, 66 struct pf_addr *, uint16_t, struct pf_addr *, uint16_t, struct pf_addr *, 67 uint16_t *, uint16_t, uint16_t, struct pf_ksrc_node **); 68 69 #define mix(a,b,c) \ 70 do { \ 71 a -= b; a -= c; a ^= (c >> 13); \ 72 b -= c; b -= a; b ^= (a << 8); \ 73 c -= a; c -= b; c ^= (b >> 13); \ 74 a -= b; a -= c; a ^= (c >> 12); \ 75 b -= c; b -= a; b ^= (a << 16); \ 76 c -= a; c -= b; c ^= (b >> 5); \ 77 a -= b; a -= c; a ^= (c >> 3); \ 78 b -= c; b -= a; b ^= (a << 10); \ 79 c -= a; c -= b; c ^= (b >> 15); \ 80 } while (0) 81 82 /* 83 * hash function based on bridge_hash in if_bridge.c 84 */ 85 static void 86 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 87 struct pf_poolhashkey *key, sa_family_t af) 88 { 89 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 90 91 switch (af) { 92 #ifdef INET 93 case AF_INET: 94 a += inaddr->addr32[0]; 95 b += key->key32[1]; 96 mix(a, b, c); 97 hash->addr32[0] = c + key->key32[2]; 98 break; 99 #endif /* INET */ 100 #ifdef INET6 101 case AF_INET6: 102 a += inaddr->addr32[0]; 103 b += inaddr->addr32[2]; 104 mix(a, b, c); 105 hash->addr32[0] = c; 106 a += inaddr->addr32[1]; 107 b += inaddr->addr32[3]; 108 c += key->key32[1]; 109 mix(a, b, c); 110 hash->addr32[1] = c; 111 a += inaddr->addr32[2]; 112 b += inaddr->addr32[1]; 113 c += key->key32[2]; 114 mix(a, b, c); 115 hash->addr32[2] = c; 116 a += inaddr->addr32[3]; 117 b += inaddr->addr32[0]; 118 c += key->key32[3]; 119 mix(a, b, c); 120 hash->addr32[3] = c; 121 break; 122 #endif /* INET6 */ 123 } 124 } 125 126 static struct pf_krule * 127 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 128 int direction, struct pfi_kkif *kif, struct pf_addr *saddr, u_int16_t sport, 129 struct pf_addr *daddr, uint16_t dport, int rs_num, 130 struct pf_kanchor_stackframe *anchor_stack) 131 { 132 struct pf_krule *r, *rm = NULL; 133 struct pf_kruleset *ruleset = NULL; 134 int tag = -1; 135 int rtableid = -1; 136 int asd = 0; 137 138 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 139 while (r && rm == NULL) { 140 struct pf_rule_addr *src = NULL, *dst = NULL; 141 struct pf_addr_wrap *xdst = NULL; 142 143 if (r->action == PF_BINAT && direction == PF_IN) { 144 src = &r->dst; 145 if (r->rpool.cur != NULL) 146 xdst = &r->rpool.cur->addr; 147 } else { 148 src = &r->src; 149 dst = &r->dst; 150 } 151 152 counter_u64_add(r->evaluations, 1); 153 if (pfi_kkif_match(r->kif, kif) == r->ifnot) 154 r = r->skip[PF_SKIP_IFP].ptr; 155 else if (r->direction && r->direction != direction) 156 r = r->skip[PF_SKIP_DIR].ptr; 157 else if (r->af && r->af != pd->af) 158 r = r->skip[PF_SKIP_AF].ptr; 159 else if (r->proto && r->proto != pd->proto) 160 r = r->skip[PF_SKIP_PROTO].ptr; 161 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 162 src->neg, kif, M_GETFIB(m))) 163 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 164 PF_SKIP_DST_ADDR].ptr; 165 else if (src->port_op && !pf_match_port(src->port_op, 166 src->port[0], src->port[1], sport)) 167 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 168 PF_SKIP_DST_PORT].ptr; 169 else if (dst != NULL && 170 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL, 171 M_GETFIB(m))) 172 r = r->skip[PF_SKIP_DST_ADDR].ptr; 173 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 174 0, NULL, M_GETFIB(m))) 175 r = TAILQ_NEXT(r, entries); 176 else if (dst != NULL && dst->port_op && 177 !pf_match_port(dst->port_op, dst->port[0], 178 dst->port[1], dport)) 179 r = r->skip[PF_SKIP_DST_PORT].ptr; 180 else if (r->match_tag && !pf_match_tag(m, r, &tag, 181 pd->pf_mtag ? pd->pf_mtag->tag : 0)) 182 r = TAILQ_NEXT(r, entries); 183 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 184 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 185 off, pd->hdr.tcp), r->os_fingerprint))) 186 r = TAILQ_NEXT(r, entries); 187 else { 188 if (r->tag) 189 tag = r->tag; 190 if (r->rtableid >= 0) 191 rtableid = r->rtableid; 192 if (r->anchor == NULL) { 193 rm = r; 194 } else 195 pf_step_into_anchor(anchor_stack, &asd, 196 &ruleset, rs_num, &r, NULL, NULL); 197 } 198 if (r == NULL) 199 pf_step_out_of_anchor(anchor_stack, &asd, &ruleset, 200 rs_num, &r, NULL, NULL); 201 } 202 203 if (tag > 0 && pf_tag_packet(m, pd, tag)) 204 return (NULL); 205 if (rtableid >= 0) 206 M_SETFIB(m, rtableid); 207 208 if (rm != NULL && (rm->action == PF_NONAT || 209 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 210 return (NULL); 211 return (rm); 212 } 213 214 static int 215 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_krule *r, 216 struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr, 217 uint16_t dport, struct pf_addr *naddr, uint16_t *nport, uint16_t low, 218 uint16_t high, struct pf_ksrc_node **sn) 219 { 220 struct pf_state_key_cmp key; 221 struct pf_addr init_addr; 222 223 bzero(&init_addr, sizeof(init_addr)); 224 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 225 return (1); 226 227 bzero(&key, sizeof(key)); 228 key.af = af; 229 key.proto = proto; 230 key.port[0] = dport; 231 PF_ACPY(&key.addr[0], daddr, key.af); 232 233 do { 234 PF_ACPY(&key.addr[1], naddr, key.af); 235 236 /* 237 * port search; start random, step; 238 * similar 2 portloop in in_pcbbind 239 */ 240 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 241 proto == IPPROTO_ICMP) || (low == 0 && high == 0)) { 242 /* 243 * XXX bug: icmp states don't use the id on both sides. 244 * (traceroute -I through nat) 245 */ 246 key.port[1] = sport; 247 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 248 *nport = sport; 249 return (0); 250 } 251 } else if (low == high) { 252 key.port[1] = htons(low); 253 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 254 *nport = htons(low); 255 return (0); 256 } 257 } else { 258 uint32_t tmp; 259 uint16_t cut; 260 261 if (low > high) { 262 tmp = low; 263 low = high; 264 high = tmp; 265 } 266 /* low < high */ 267 cut = arc4random() % (1 + high - low) + low; 268 /* low <= cut <= high */ 269 for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) { 270 key.port[1] = htons(tmp); 271 if (pf_find_state_all(&key, PF_IN, NULL) == 272 NULL) { 273 *nport = htons(tmp); 274 return (0); 275 } 276 } 277 tmp = cut; 278 for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) { 279 key.port[1] = htons(tmp); 280 if (pf_find_state_all(&key, PF_IN, NULL) == 281 NULL) { 282 *nport = htons(tmp); 283 return (0); 284 } 285 } 286 } 287 288 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 289 case PF_POOL_RANDOM: 290 case PF_POOL_ROUNDROBIN: 291 /* 292 * pick a different source address since we're out 293 * of free port choices for the current one. 294 */ 295 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 296 return (1); 297 break; 298 case PF_POOL_NONE: 299 case PF_POOL_SRCHASH: 300 case PF_POOL_BITMASK: 301 default: 302 return (1); 303 } 304 } while (! PF_AEQ(&init_addr, naddr, af) ); 305 return (1); /* none available */ 306 } 307 308 static int 309 pf_get_mape_sport(sa_family_t af, u_int8_t proto, struct pf_krule *r, 310 struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr, 311 uint16_t dport, struct pf_addr *naddr, uint16_t *nport, 312 struct pf_ksrc_node **sn) 313 { 314 uint16_t psmask, low, highmask; 315 uint16_t i, ahigh, cut; 316 int ashift, psidshift; 317 318 ashift = 16 - r->rpool.mape.offset; 319 psidshift = ashift - r->rpool.mape.psidlen; 320 psmask = r->rpool.mape.psid & ((1U << r->rpool.mape.psidlen) - 1); 321 psmask = psmask << psidshift; 322 highmask = (1U << psidshift) - 1; 323 324 ahigh = (1U << r->rpool.mape.offset) - 1; 325 cut = arc4random() & ahigh; 326 if (cut == 0) 327 cut = 1; 328 329 for (i = cut; i <= ahigh; i++) { 330 low = (i << ashift) | psmask; 331 if (!pf_get_sport(af, proto, r, saddr, sport, daddr, dport, 332 naddr, nport, low, low | highmask, sn)) 333 return (0); 334 } 335 for (i = cut - 1; i > 0; i--) { 336 low = (i << ashift) | psmask; 337 if (!pf_get_sport(af, proto, r, saddr, sport, daddr, dport, 338 naddr, nport, low, low | highmask, sn)) 339 return (0); 340 } 341 return (1); 342 } 343 344 int 345 pf_map_addr(sa_family_t af, struct pf_krule *r, struct pf_addr *saddr, 346 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_ksrc_node **sn) 347 { 348 struct pf_kpool *rpool = &r->rpool; 349 struct pf_addr *raddr = NULL, *rmask = NULL; 350 351 /* Try to find a src_node if none was given and this 352 is a sticky-address rule. */ 353 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 354 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) 355 *sn = pf_find_src_node(saddr, r, af, 0); 356 357 /* If a src_node was found or explicitly given and it has a non-zero 358 route address, use this address. A zeroed address is found if the 359 src node was created just a moment ago in pf_create_state and it 360 needs to be filled in with routing decision calculated here. */ 361 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 362 /* If the supplied address is the same as the current one we've 363 * been asked before, so tell the caller that there's no other 364 * address to be had. */ 365 if (PF_AEQ(naddr, &(*sn)->raddr, af)) 366 return (1); 367 368 PF_ACPY(naddr, &(*sn)->raddr, af); 369 if (V_pf_status.debug >= PF_DEBUG_MISC) { 370 printf("pf_map_addr: src tracking maps "); 371 pf_print_host(saddr, 0, af); 372 printf(" to "); 373 pf_print_host(naddr, 0, af); 374 printf("\n"); 375 } 376 return (0); 377 } 378 379 /* Find the route using chosen algorithm. Store the found route 380 in src_node if it was given or found. */ 381 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 382 return (1); 383 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 384 switch (af) { 385 #ifdef INET 386 case AF_INET: 387 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 388 (rpool->opts & PF_POOL_TYPEMASK) != 389 PF_POOL_ROUNDROBIN) 390 return (1); 391 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 392 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 393 break; 394 #endif /* INET */ 395 #ifdef INET6 396 case AF_INET6: 397 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 398 (rpool->opts & PF_POOL_TYPEMASK) != 399 PF_POOL_ROUNDROBIN) 400 return (1); 401 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 402 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 403 break; 404 #endif /* INET6 */ 405 } 406 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 407 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 408 return (1); /* unsupported */ 409 } else { 410 raddr = &rpool->cur->addr.v.a.addr; 411 rmask = &rpool->cur->addr.v.a.mask; 412 } 413 414 switch (rpool->opts & PF_POOL_TYPEMASK) { 415 case PF_POOL_NONE: 416 PF_ACPY(naddr, raddr, af); 417 break; 418 case PF_POOL_BITMASK: 419 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 420 break; 421 case PF_POOL_RANDOM: 422 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 423 switch (af) { 424 #ifdef INET 425 case AF_INET: 426 rpool->counter.addr32[0] = htonl(arc4random()); 427 break; 428 #endif /* INET */ 429 #ifdef INET6 430 case AF_INET6: 431 if (rmask->addr32[3] != 0xffffffff) 432 rpool->counter.addr32[3] = 433 htonl(arc4random()); 434 else 435 break; 436 if (rmask->addr32[2] != 0xffffffff) 437 rpool->counter.addr32[2] = 438 htonl(arc4random()); 439 else 440 break; 441 if (rmask->addr32[1] != 0xffffffff) 442 rpool->counter.addr32[1] = 443 htonl(arc4random()); 444 else 445 break; 446 if (rmask->addr32[0] != 0xffffffff) 447 rpool->counter.addr32[0] = 448 htonl(arc4random()); 449 break; 450 #endif /* INET6 */ 451 } 452 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 453 PF_ACPY(init_addr, naddr, af); 454 455 } else { 456 PF_AINC(&rpool->counter, af); 457 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 458 } 459 break; 460 case PF_POOL_SRCHASH: 461 { 462 unsigned char hash[16]; 463 464 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 465 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 466 break; 467 } 468 case PF_POOL_ROUNDROBIN: 469 { 470 struct pf_kpooladdr *acur = rpool->cur; 471 472 /* 473 * XXXGL: in the round-robin case we need to store 474 * the round-robin machine state in the rule, thus 475 * forwarding thread needs to modify rule. 476 * 477 * This is done w/o locking, because performance is assumed 478 * more important than round-robin precision. 479 * 480 * In the simpliest case we just update the "rpool->cur" 481 * pointer. However, if pool contains tables or dynamic 482 * addresses, then "tblidx" is also used to store machine 483 * state. Since "tblidx" is int, concurrent access to it can't 484 * lead to inconsistence, only to lost of precision. 485 * 486 * Things get worse, if table contains not hosts, but 487 * prefixes. In this case counter also stores machine state, 488 * and for IPv6 address, counter can't be updated atomically. 489 * Probably, using round-robin on a table containing IPv6 490 * prefixes (or even IPv4) would cause a panic. 491 */ 492 493 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 494 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 495 &rpool->tblidx, &rpool->counter, af)) 496 goto get_addr; 497 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 498 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 499 &rpool->tblidx, &rpool->counter, af)) 500 goto get_addr; 501 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 502 goto get_addr; 503 504 try_next: 505 if (TAILQ_NEXT(rpool->cur, entries) == NULL) 506 rpool->cur = TAILQ_FIRST(&rpool->list); 507 else 508 rpool->cur = TAILQ_NEXT(rpool->cur, entries); 509 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 510 rpool->tblidx = -1; 511 if (pfr_pool_get(rpool->cur->addr.p.tbl, 512 &rpool->tblidx, &rpool->counter, af)) { 513 /* table contains no address of type 'af' */ 514 if (rpool->cur != acur) 515 goto try_next; 516 return (1); 517 } 518 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 519 rpool->tblidx = -1; 520 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 521 &rpool->tblidx, &rpool->counter, af)) { 522 /* table contains no address of type 'af' */ 523 if (rpool->cur != acur) 524 goto try_next; 525 return (1); 526 } 527 } else { 528 raddr = &rpool->cur->addr.v.a.addr; 529 rmask = &rpool->cur->addr.v.a.mask; 530 PF_ACPY(&rpool->counter, raddr, af); 531 } 532 533 get_addr: 534 PF_ACPY(naddr, &rpool->counter, af); 535 if (init_addr != NULL && PF_AZERO(init_addr, af)) 536 PF_ACPY(init_addr, naddr, af); 537 PF_AINC(&rpool->counter, af); 538 break; 539 } 540 } 541 if (*sn != NULL) 542 PF_ACPY(&(*sn)->raddr, naddr, af); 543 544 if (V_pf_status.debug >= PF_DEBUG_MISC && 545 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 546 printf("pf_map_addr: selected address "); 547 pf_print_host(naddr, 0, af); 548 printf("\n"); 549 } 550 551 return (0); 552 } 553 554 struct pf_krule * 555 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 556 struct pfi_kkif *kif, struct pf_ksrc_node **sn, 557 struct pf_state_key **skp, struct pf_state_key **nkp, 558 struct pf_addr *saddr, struct pf_addr *daddr, 559 uint16_t sport, uint16_t dport, struct pf_kanchor_stackframe *anchor_stack) 560 { 561 struct pf_krule *r = NULL; 562 struct pf_addr *naddr; 563 uint16_t *nport; 564 uint16_t low, high; 565 566 PF_RULES_RASSERT(); 567 KASSERT(*skp == NULL, ("*skp not NULL")); 568 KASSERT(*nkp == NULL, ("*nkp not NULL")); 569 570 if (direction == PF_OUT) { 571 r = pf_match_translation(pd, m, off, direction, kif, saddr, 572 sport, daddr, dport, PF_RULESET_BINAT, anchor_stack); 573 if (r == NULL) 574 r = pf_match_translation(pd, m, off, direction, kif, 575 saddr, sport, daddr, dport, PF_RULESET_NAT, 576 anchor_stack); 577 } else { 578 r = pf_match_translation(pd, m, off, direction, kif, saddr, 579 sport, daddr, dport, PF_RULESET_RDR, anchor_stack); 580 if (r == NULL) 581 r = pf_match_translation(pd, m, off, direction, kif, 582 saddr, sport, daddr, dport, PF_RULESET_BINAT, 583 anchor_stack); 584 } 585 586 if (r == NULL) 587 return (NULL); 588 589 switch (r->action) { 590 case PF_NONAT: 591 case PF_NOBINAT: 592 case PF_NORDR: 593 return (NULL); 594 } 595 596 *skp = pf_state_key_setup(pd, saddr, daddr, sport, dport); 597 if (*skp == NULL) 598 return (NULL); 599 *nkp = pf_state_key_clone(*skp); 600 if (*nkp == NULL) { 601 uma_zfree(V_pf_state_key_z, *skp); 602 *skp = NULL; 603 return (NULL); 604 } 605 606 /* XXX We only modify one side for now. */ 607 naddr = &(*nkp)->addr[1]; 608 nport = &(*nkp)->port[1]; 609 610 switch (r->action) { 611 case PF_NAT: 612 if (pd->proto == IPPROTO_ICMP) { 613 low = 1; 614 high = 65535; 615 } else { 616 low = r->rpool.proxy_port[0]; 617 high = r->rpool.proxy_port[1]; 618 } 619 if (r->rpool.mape.offset > 0) { 620 if (pf_get_mape_sport(pd->af, pd->proto, r, saddr, 621 sport, daddr, dport, naddr, nport, sn)) { 622 DPFPRINTF(PF_DEBUG_MISC, 623 ("pf: MAP-E port allocation (%u/%u/%u)" 624 " failed\n", 625 r->rpool.mape.offset, 626 r->rpool.mape.psidlen, 627 r->rpool.mape.psid)); 628 goto notrans; 629 } 630 } else if (pf_get_sport(pd->af, pd->proto, r, saddr, sport, 631 daddr, dport, naddr, nport, low, high, sn)) { 632 DPFPRINTF(PF_DEBUG_MISC, 633 ("pf: NAT proxy port allocation (%u-%u) failed\n", 634 r->rpool.proxy_port[0], r->rpool.proxy_port[1])); 635 goto notrans; 636 } 637 break; 638 case PF_BINAT: 639 switch (direction) { 640 case PF_OUT: 641 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 642 switch (pd->af) { 643 #ifdef INET 644 case AF_INET: 645 if (r->rpool.cur->addr.p.dyn-> 646 pfid_acnt4 < 1) 647 goto notrans; 648 PF_POOLMASK(naddr, 649 &r->rpool.cur->addr.p.dyn-> 650 pfid_addr4, 651 &r->rpool.cur->addr.p.dyn-> 652 pfid_mask4, saddr, AF_INET); 653 break; 654 #endif /* INET */ 655 #ifdef INET6 656 case AF_INET6: 657 if (r->rpool.cur->addr.p.dyn-> 658 pfid_acnt6 < 1) 659 goto notrans; 660 PF_POOLMASK(naddr, 661 &r->rpool.cur->addr.p.dyn-> 662 pfid_addr6, 663 &r->rpool.cur->addr.p.dyn-> 664 pfid_mask6, saddr, AF_INET6); 665 break; 666 #endif /* INET6 */ 667 } 668 } else 669 PF_POOLMASK(naddr, 670 &r->rpool.cur->addr.v.a.addr, 671 &r->rpool.cur->addr.v.a.mask, saddr, 672 pd->af); 673 break; 674 case PF_IN: 675 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 676 switch (pd->af) { 677 #ifdef INET 678 case AF_INET: 679 if (r->src.addr.p.dyn-> pfid_acnt4 < 1) 680 goto notrans; 681 PF_POOLMASK(naddr, 682 &r->src.addr.p.dyn->pfid_addr4, 683 &r->src.addr.p.dyn->pfid_mask4, 684 daddr, AF_INET); 685 break; 686 #endif /* INET */ 687 #ifdef INET6 688 case AF_INET6: 689 if (r->src.addr.p.dyn->pfid_acnt6 < 1) 690 goto notrans; 691 PF_POOLMASK(naddr, 692 &r->src.addr.p.dyn->pfid_addr6, 693 &r->src.addr.p.dyn->pfid_mask6, 694 daddr, AF_INET6); 695 break; 696 #endif /* INET6 */ 697 } 698 } else 699 PF_POOLMASK(naddr, &r->src.addr.v.a.addr, 700 &r->src.addr.v.a.mask, daddr, pd->af); 701 break; 702 } 703 break; 704 case PF_RDR: { 705 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 706 goto notrans; 707 if ((r->rpool.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK) 708 PF_POOLMASK(naddr, naddr, &r->rpool.cur->addr.v.a.mask, 709 daddr, pd->af); 710 711 if (r->rpool.proxy_port[1]) { 712 uint32_t tmp_nport; 713 714 tmp_nport = ((ntohs(dport) - ntohs(r->dst.port[0])) % 715 (r->rpool.proxy_port[1] - r->rpool.proxy_port[0] + 716 1)) + r->rpool.proxy_port[0]; 717 718 /* Wrap around if necessary. */ 719 if (tmp_nport > 65535) 720 tmp_nport -= 65535; 721 *nport = htons((uint16_t)tmp_nport); 722 } else if (r->rpool.proxy_port[0]) 723 *nport = htons(r->rpool.proxy_port[0]); 724 break; 725 } 726 default: 727 panic("%s: unknown action %u", __func__, r->action); 728 } 729 730 /* Return success only if translation really happened. */ 731 if (bcmp(*skp, *nkp, sizeof(struct pf_state_key_cmp))) 732 return (r); 733 734 notrans: 735 uma_zfree(V_pf_state_key_z, *nkp); 736 uma_zfree(V_pf_state_key_z, *skp); 737 *skp = *nkp = NULL; 738 *sn = NULL; 739 740 return (NULL); 741 } 742