pf_lb.c revision 261023
1244769Sglebius/*- 2223637Sbz * Copyright (c) 2001 Daniel Hartmeier 3223637Sbz * Copyright (c) 2002 - 2008 Henning Brauer 4223637Sbz * All rights reserved. 5223637Sbz * 6223637Sbz * Redistribution and use in source and binary forms, with or without 7223637Sbz * modification, are permitted provided that the following conditions 8223637Sbz * are met: 9223637Sbz * 10223637Sbz * - Redistributions of source code must retain the above copyright 11223637Sbz * notice, this list of conditions and the following disclaimer. 12223637Sbz * - Redistributions in binary form must reproduce the above 13223637Sbz * copyright notice, this list of conditions and the following 14223637Sbz * disclaimer in the documentation and/or other materials provided 15223637Sbz * with the distribution. 16223637Sbz * 17223637Sbz * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18223637Sbz * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19223637Sbz * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 20223637Sbz * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 21223637Sbz * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 22223637Sbz * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23223637Sbz * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24223637Sbz * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 25223637Sbz * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26223637Sbz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 27223637Sbz * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28223637Sbz * POSSIBILITY OF SUCH DAMAGE. 29223637Sbz * 30223637Sbz * Effort sponsored in part by the Defense Advanced Research Projects 31223637Sbz * Agency (DARPA) and Air Force Research Laboratory, Air Force 32223637Sbz * Materiel Command, USAF, under agreement number F30602-01-2-0537. 33223637Sbz * 34244769Sglebius * $OpenBSD: pf_lb.c,v 1.2 2009/02/12 02:13:15 sthen Exp $ 35223637Sbz */ 36223637Sbz 37223637Sbz#include <sys/cdefs.h> 38223637Sbz__FBSDID("$FreeBSD: stable/10/sys/netpfil/pf/pf_lb.c 261023 2014-01-22 10:45:16Z glebius $"); 39223637Sbz 40223637Sbz#include "opt_pf.h" 41240233Sglebius#include "opt_inet.h" 42240233Sglebius#include "opt_inet6.h" 43223637Sbz 44223637Sbz#include <sys/param.h> 45223637Sbz#include <sys/socket.h> 46223637Sbz#include <sys/sysctl.h> 47223637Sbz 48223637Sbz#include <net/if.h> 49223637Sbz#include <net/pfvar.h> 50223637Sbz#include <net/if_pflog.h> 51240233Sglebius#include <net/pf_mtag.h> 52223637Sbz 53223637Sbz#define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x 54223637Sbz 55240233Sglebiusstatic void pf_hash(struct pf_addr *, struct pf_addr *, 56223637Sbz struct pf_poolhashkey *, sa_family_t); 57240233Sglebiusstatic struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 58223637Sbz int, int, struct pfi_kif *, 59223637Sbz struct pf_addr *, u_int16_t, struct pf_addr *, 60240641Sglebius uint16_t, int, struct pf_anchor_stackframe *); 61255143Sglebiusstatic int pf_get_sport(sa_family_t, uint8_t, struct pf_rule *, 62255143Sglebius struct pf_addr *, uint16_t, struct pf_addr *, uint16_t, struct pf_addr *, 63255143Sglebius uint16_t *, uint16_t, uint16_t, struct pf_src_node **); 64223637Sbz 65223637Sbz#define mix(a,b,c) \ 66223637Sbz do { \ 67223637Sbz a -= b; a -= c; a ^= (c >> 13); \ 68223637Sbz b -= c; b -= a; b ^= (a << 8); \ 69223637Sbz c -= a; c -= b; c ^= (b >> 13); \ 70223637Sbz a -= b; a -= c; a ^= (c >> 12); \ 71223637Sbz b -= c; b -= a; b ^= (a << 16); \ 72223637Sbz c -= a; c -= b; c ^= (b >> 5); \ 73223637Sbz a -= b; a -= c; a ^= (c >> 3); \ 74223637Sbz b -= c; b -= a; b ^= (a << 10); \ 75223637Sbz c -= a; c -= b; c ^= (b >> 15); \ 76223637Sbz } while (0) 77223637Sbz 78223637Sbz/* 79223637Sbz * hash function based on bridge_hash in if_bridge.c 80223637Sbz */ 81240233Sglebiusstatic void 82223637Sbzpf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 83223637Sbz struct pf_poolhashkey *key, sa_family_t af) 84223637Sbz{ 85223637Sbz u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 86223637Sbz 87223637Sbz switch (af) { 88223637Sbz#ifdef INET 89223637Sbz case AF_INET: 90223637Sbz a += inaddr->addr32[0]; 91223637Sbz b += key->key32[1]; 92223637Sbz mix(a, b, c); 93223637Sbz hash->addr32[0] = c + key->key32[2]; 94223637Sbz break; 95223637Sbz#endif /* INET */ 96223637Sbz#ifdef INET6 97223637Sbz case AF_INET6: 98223637Sbz a += inaddr->addr32[0]; 99223637Sbz b += inaddr->addr32[2]; 100223637Sbz mix(a, b, c); 101223637Sbz hash->addr32[0] = c; 102223637Sbz a += inaddr->addr32[1]; 103223637Sbz b += inaddr->addr32[3]; 104223637Sbz c += key->key32[1]; 105223637Sbz mix(a, b, c); 106223637Sbz hash->addr32[1] = c; 107223637Sbz a += inaddr->addr32[2]; 108223637Sbz b += inaddr->addr32[1]; 109223637Sbz c += key->key32[2]; 110223637Sbz mix(a, b, c); 111223637Sbz hash->addr32[2] = c; 112223637Sbz a += inaddr->addr32[3]; 113223637Sbz b += inaddr->addr32[0]; 114223637Sbz c += key->key32[3]; 115223637Sbz mix(a, b, c); 116223637Sbz hash->addr32[3] = c; 117223637Sbz break; 118223637Sbz#endif /* INET6 */ 119223637Sbz } 120223637Sbz} 121223637Sbz 122240233Sglebiusstatic struct pf_rule * 123223637Sbzpf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 124223637Sbz int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 125240641Sglebius struct pf_addr *daddr, uint16_t dport, int rs_num, 126240641Sglebius struct pf_anchor_stackframe *anchor_stack) 127223637Sbz{ 128223637Sbz struct pf_rule *r, *rm = NULL; 129223637Sbz struct pf_ruleset *ruleset = NULL; 130223637Sbz int tag = -1; 131223637Sbz int rtableid = -1; 132223637Sbz int asd = 0; 133223637Sbz 134223637Sbz r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 135223637Sbz while (r && rm == NULL) { 136223637Sbz struct pf_rule_addr *src = NULL, *dst = NULL; 137223637Sbz struct pf_addr_wrap *xdst = NULL; 138223637Sbz 139223637Sbz if (r->action == PF_BINAT && direction == PF_IN) { 140223637Sbz src = &r->dst; 141223637Sbz if (r->rpool.cur != NULL) 142223637Sbz xdst = &r->rpool.cur->addr; 143223637Sbz } else { 144223637Sbz src = &r->src; 145223637Sbz dst = &r->dst; 146223637Sbz } 147223637Sbz 148223637Sbz r->evaluations++; 149223637Sbz if (pfi_kif_match(r->kif, kif) == r->ifnot) 150223637Sbz r = r->skip[PF_SKIP_IFP].ptr; 151223637Sbz else if (r->direction && r->direction != direction) 152223637Sbz r = r->skip[PF_SKIP_DIR].ptr; 153223637Sbz else if (r->af && r->af != pd->af) 154223637Sbz r = r->skip[PF_SKIP_AF].ptr; 155223637Sbz else if (r->proto && r->proto != pd->proto) 156223637Sbz r = r->skip[PF_SKIP_PROTO].ptr; 157223637Sbz else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 158231852Sbz src->neg, kif, M_GETFIB(m))) 159223637Sbz r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 160223637Sbz PF_SKIP_DST_ADDR].ptr; 161223637Sbz else if (src->port_op && !pf_match_port(src->port_op, 162223637Sbz src->port[0], src->port[1], sport)) 163223637Sbz r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 164223637Sbz PF_SKIP_DST_PORT].ptr; 165223637Sbz else if (dst != NULL && 166231852Sbz PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL, 167231852Sbz M_GETFIB(m))) 168223637Sbz r = r->skip[PF_SKIP_DST_ADDR].ptr; 169223637Sbz else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 170231852Sbz 0, NULL, M_GETFIB(m))) 171223637Sbz r = TAILQ_NEXT(r, entries); 172223637Sbz else if (dst != NULL && dst->port_op && 173223637Sbz !pf_match_port(dst->port_op, dst->port[0], 174223637Sbz dst->port[1], dport)) 175223637Sbz r = r->skip[PF_SKIP_DST_PORT].ptr; 176240233Sglebius else if (r->match_tag && !pf_match_tag(m, r, &tag, 177240233Sglebius pd->pf_mtag ? pd->pf_mtag->tag : 0)) 178223637Sbz r = TAILQ_NEXT(r, entries); 179223637Sbz else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 180223637Sbz IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 181223637Sbz off, pd->hdr.tcp), r->os_fingerprint))) 182223637Sbz r = TAILQ_NEXT(r, entries); 183223637Sbz else { 184223637Sbz if (r->tag) 185223637Sbz tag = r->tag; 186223637Sbz if (r->rtableid >= 0) 187223637Sbz rtableid = r->rtableid; 188223637Sbz if (r->anchor == NULL) { 189223637Sbz rm = r; 190223637Sbz } else 191240641Sglebius pf_step_into_anchor(anchor_stack, &asd, 192240641Sglebius &ruleset, rs_num, &r, NULL, NULL); 193223637Sbz } 194223637Sbz if (r == NULL) 195240641Sglebius pf_step_out_of_anchor(anchor_stack, &asd, &ruleset, 196240641Sglebius rs_num, &r, NULL, NULL); 197223637Sbz } 198240233Sglebius 199240233Sglebius if (tag > 0 && pf_tag_packet(m, pd, tag)) 200223637Sbz return (NULL); 201240233Sglebius if (rtableid >= 0) 202240233Sglebius M_SETFIB(m, rtableid); 203240233Sglebius 204223637Sbz if (rm != NULL && (rm->action == PF_NONAT || 205223637Sbz rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 206223637Sbz return (NULL); 207223637Sbz return (rm); 208223637Sbz} 209223637Sbz 210240233Sglebiusstatic int 211223637Sbzpf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 212255143Sglebius struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr, 213255143Sglebius uint16_t dport, struct pf_addr *naddr, uint16_t *nport, uint16_t low, 214255143Sglebius uint16_t high, struct pf_src_node **sn) 215223637Sbz{ 216223637Sbz struct pf_state_key_cmp key; 217223637Sbz struct pf_addr init_addr; 218255143Sglebius uint16_t cut; 219223637Sbz 220223637Sbz bzero(&init_addr, sizeof(init_addr)); 221223637Sbz if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 222223637Sbz return (1); 223223637Sbz 224223637Sbz if (proto == IPPROTO_ICMP) { 225223637Sbz low = 1; 226223637Sbz high = 65535; 227223637Sbz } 228223637Sbz 229255143Sglebius bzero(&key, sizeof(key)); 230255143Sglebius key.af = af; 231255143Sglebius key.proto = proto; 232255143Sglebius key.port[0] = dport; 233255143Sglebius PF_ACPY(&key.addr[0], daddr, key.af); 234255143Sglebius 235223637Sbz do { 236255143Sglebius PF_ACPY(&key.addr[1], naddr, key.af); 237223637Sbz 238223637Sbz /* 239223637Sbz * port search; start random, step; 240223637Sbz * similar 2 portloop in in_pcbbind 241223637Sbz */ 242223637Sbz if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 243255143Sglebius proto == IPPROTO_ICMP) || (low == 0 && high == 0)) { 244255143Sglebius /* 245255143Sglebius * XXX bug: icmp states don't use the id on both sides. 246255143Sglebius * (traceroute -I through nat) 247255143Sglebius */ 248255143Sglebius key.port[1] = sport; 249255143Sglebius if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 250255143Sglebius *nport = sport; 251223637Sbz return (0); 252255143Sglebius } 253223637Sbz } else if (low == high) { 254255143Sglebius key.port[1] = htons(low); 255223637Sbz if (pf_find_state_all(&key, PF_IN, NULL) == NULL) { 256223637Sbz *nport = htons(low); 257223637Sbz return (0); 258223637Sbz } 259223637Sbz } else { 260255143Sglebius uint16_t tmp; 261223637Sbz 262223637Sbz if (low > high) { 263223637Sbz tmp = low; 264223637Sbz low = high; 265223637Sbz high = tmp; 266223637Sbz } 267223637Sbz /* low < high */ 268223637Sbz cut = htonl(arc4random()) % (1 + high - low) + low; 269223637Sbz /* low <= cut <= high */ 270223637Sbz for (tmp = cut; tmp <= high; ++(tmp)) { 271255143Sglebius key.port[1] = htons(tmp); 272223637Sbz if (pf_find_state_all(&key, PF_IN, NULL) == 273223637Sbz NULL) { 274223637Sbz *nport = htons(tmp); 275223637Sbz return (0); 276223637Sbz } 277223637Sbz } 278223637Sbz for (tmp = cut - 1; tmp >= low; --(tmp)) { 279255143Sglebius key.port[1] = htons(tmp); 280223637Sbz if (pf_find_state_all(&key, PF_IN, NULL) == 281223637Sbz NULL) { 282223637Sbz *nport = htons(tmp); 283223637Sbz return (0); 284223637Sbz } 285223637Sbz } 286223637Sbz } 287223637Sbz 288223637Sbz switch (r->rpool.opts & PF_POOL_TYPEMASK) { 289223637Sbz case PF_POOL_RANDOM: 290223637Sbz case PF_POOL_ROUNDROBIN: 291223637Sbz if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 292223637Sbz return (1); 293223637Sbz break; 294223637Sbz case PF_POOL_NONE: 295223637Sbz case PF_POOL_SRCHASH: 296223637Sbz case PF_POOL_BITMASK: 297223637Sbz default: 298223637Sbz return (1); 299223637Sbz } 300223637Sbz } while (! PF_AEQ(&init_addr, naddr, af) ); 301223637Sbz return (1); /* none available */ 302223637Sbz} 303223637Sbz 304223637Sbzint 305223637Sbzpf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 306223637Sbz struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 307223637Sbz{ 308223637Sbz struct pf_pool *rpool = &r->rpool; 309240233Sglebius struct pf_addr *raddr = NULL, *rmask = NULL; 310223637Sbz 311223637Sbz if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 312223637Sbz (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 313240233Sglebius *sn = pf_find_src_node(saddr, r, af, 0); 314223637Sbz if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 315223637Sbz PF_ACPY(naddr, &(*sn)->raddr, af); 316223637Sbz if (V_pf_status.debug >= PF_DEBUG_MISC) { 317223637Sbz printf("pf_map_addr: src tracking maps "); 318240233Sglebius pf_print_host(saddr, 0, af); 319223637Sbz printf(" to "); 320223637Sbz pf_print_host(naddr, 0, af); 321223637Sbz printf("\n"); 322223637Sbz } 323223637Sbz return (0); 324223637Sbz } 325223637Sbz } 326223637Sbz 327223637Sbz if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 328223637Sbz return (1); 329223637Sbz if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 330223637Sbz switch (af) { 331223637Sbz#ifdef INET 332223637Sbz case AF_INET: 333223637Sbz if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 334223637Sbz (rpool->opts & PF_POOL_TYPEMASK) != 335223637Sbz PF_POOL_ROUNDROBIN) 336223637Sbz return (1); 337223637Sbz raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 338223637Sbz rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 339223637Sbz break; 340223637Sbz#endif /* INET */ 341223637Sbz#ifdef INET6 342223637Sbz case AF_INET6: 343223637Sbz if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 344223637Sbz (rpool->opts & PF_POOL_TYPEMASK) != 345223637Sbz PF_POOL_ROUNDROBIN) 346223637Sbz return (1); 347223637Sbz raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 348223637Sbz rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 349223637Sbz break; 350223637Sbz#endif /* INET6 */ 351223637Sbz } 352223637Sbz } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 353223637Sbz if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 354223637Sbz return (1); /* unsupported */ 355223637Sbz } else { 356223637Sbz raddr = &rpool->cur->addr.v.a.addr; 357223637Sbz rmask = &rpool->cur->addr.v.a.mask; 358223637Sbz } 359223637Sbz 360223637Sbz switch (rpool->opts & PF_POOL_TYPEMASK) { 361223637Sbz case PF_POOL_NONE: 362223637Sbz PF_ACPY(naddr, raddr, af); 363223637Sbz break; 364223637Sbz case PF_POOL_BITMASK: 365223637Sbz PF_POOLMASK(naddr, raddr, rmask, saddr, af); 366223637Sbz break; 367223637Sbz case PF_POOL_RANDOM: 368223637Sbz if (init_addr != NULL && PF_AZERO(init_addr, af)) { 369223637Sbz switch (af) { 370223637Sbz#ifdef INET 371223637Sbz case AF_INET: 372223637Sbz rpool->counter.addr32[0] = htonl(arc4random()); 373223637Sbz break; 374223637Sbz#endif /* INET */ 375223637Sbz#ifdef INET6 376223637Sbz case AF_INET6: 377223637Sbz if (rmask->addr32[3] != 0xffffffff) 378223637Sbz rpool->counter.addr32[3] = 379223637Sbz htonl(arc4random()); 380223637Sbz else 381223637Sbz break; 382223637Sbz if (rmask->addr32[2] != 0xffffffff) 383223637Sbz rpool->counter.addr32[2] = 384223637Sbz htonl(arc4random()); 385223637Sbz else 386223637Sbz break; 387223637Sbz if (rmask->addr32[1] != 0xffffffff) 388223637Sbz rpool->counter.addr32[1] = 389223637Sbz htonl(arc4random()); 390223637Sbz else 391223637Sbz break; 392223637Sbz if (rmask->addr32[0] != 0xffffffff) 393223637Sbz rpool->counter.addr32[0] = 394223637Sbz htonl(arc4random()); 395223637Sbz break; 396223637Sbz#endif /* INET6 */ 397223637Sbz } 398223637Sbz PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 399223637Sbz PF_ACPY(init_addr, naddr, af); 400223637Sbz 401223637Sbz } else { 402223637Sbz PF_AINC(&rpool->counter, af); 403223637Sbz PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 404223637Sbz } 405223637Sbz break; 406223637Sbz case PF_POOL_SRCHASH: 407240233Sglebius { 408240233Sglebius unsigned char hash[16]; 409240233Sglebius 410223637Sbz pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 411223637Sbz PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 412223637Sbz break; 413240233Sglebius } 414223637Sbz case PF_POOL_ROUNDROBIN: 415240233Sglebius { 416240233Sglebius struct pf_pooladdr *acur = rpool->cur; 417240233Sglebius 418240233Sglebius /* 419240233Sglebius * XXXGL: in the round-robin case we need to store 420240233Sglebius * the round-robin machine state in the rule, thus 421240233Sglebius * forwarding thread needs to modify rule. 422240233Sglebius * 423240233Sglebius * This is done w/o locking, because performance is assumed 424240233Sglebius * more important than round-robin precision. 425240233Sglebius * 426240233Sglebius * In the simpliest case we just update the "rpool->cur" 427240233Sglebius * pointer. However, if pool contains tables or dynamic 428240233Sglebius * addresses, then "tblidx" is also used to store machine 429240233Sglebius * state. Since "tblidx" is int, concurrent access to it can't 430240233Sglebius * lead to inconsistence, only to lost of precision. 431240233Sglebius * 432240233Sglebius * Things get worse, if table contains not hosts, but 433240233Sglebius * prefixes. In this case counter also stores machine state, 434240233Sglebius * and for IPv6 address, counter can't be updated atomically. 435240233Sglebius * Probably, using round-robin on a table containing IPv6 436240233Sglebius * prefixes (or even IPv4) would cause a panic. 437240233Sglebius */ 438240233Sglebius 439223637Sbz if (rpool->cur->addr.type == PF_ADDR_TABLE) { 440223637Sbz if (!pfr_pool_get(rpool->cur->addr.p.tbl, 441240233Sglebius &rpool->tblidx, &rpool->counter, af)) 442223637Sbz goto get_addr; 443223637Sbz } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 444223637Sbz if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 445240233Sglebius &rpool->tblidx, &rpool->counter, af)) 446223637Sbz goto get_addr; 447223637Sbz } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 448223637Sbz goto get_addr; 449223637Sbz 450223637Sbz try_next: 451240233Sglebius if (TAILQ_NEXT(rpool->cur, entries) == NULL) 452223637Sbz rpool->cur = TAILQ_FIRST(&rpool->list); 453240233Sglebius else 454240233Sglebius rpool->cur = TAILQ_NEXT(rpool->cur, entries); 455223637Sbz if (rpool->cur->addr.type == PF_ADDR_TABLE) { 456223637Sbz rpool->tblidx = -1; 457223637Sbz if (pfr_pool_get(rpool->cur->addr.p.tbl, 458240233Sglebius &rpool->tblidx, &rpool->counter, af)) { 459223637Sbz /* table contains no address of type 'af' */ 460223637Sbz if (rpool->cur != acur) 461223637Sbz goto try_next; 462223637Sbz return (1); 463223637Sbz } 464223637Sbz } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 465223637Sbz rpool->tblidx = -1; 466223637Sbz if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 467240233Sglebius &rpool->tblidx, &rpool->counter, af)) { 468223637Sbz /* table contains no address of type 'af' */ 469223637Sbz if (rpool->cur != acur) 470223637Sbz goto try_next; 471223637Sbz return (1); 472223637Sbz } 473223637Sbz } else { 474223637Sbz raddr = &rpool->cur->addr.v.a.addr; 475223637Sbz rmask = &rpool->cur->addr.v.a.mask; 476223637Sbz PF_ACPY(&rpool->counter, raddr, af); 477223637Sbz } 478223637Sbz 479223637Sbz get_addr: 480223637Sbz PF_ACPY(naddr, &rpool->counter, af); 481223637Sbz if (init_addr != NULL && PF_AZERO(init_addr, af)) 482223637Sbz PF_ACPY(init_addr, naddr, af); 483223637Sbz PF_AINC(&rpool->counter, af); 484223637Sbz break; 485240233Sglebius } 486223637Sbz } 487223637Sbz if (*sn != NULL) 488223637Sbz PF_ACPY(&(*sn)->raddr, naddr, af); 489223637Sbz 490223637Sbz if (V_pf_status.debug >= PF_DEBUG_MISC && 491223637Sbz (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 492223637Sbz printf("pf_map_addr: selected address "); 493223637Sbz pf_print_host(naddr, 0, af); 494223637Sbz printf("\n"); 495223637Sbz } 496223637Sbz 497223637Sbz return (0); 498223637Sbz} 499223637Sbz 500223637Sbzstruct pf_rule * 501223637Sbzpf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 502223637Sbz struct pfi_kif *kif, struct pf_src_node **sn, 503223637Sbz struct pf_state_key **skp, struct pf_state_key **nkp, 504223637Sbz struct pf_addr *saddr, struct pf_addr *daddr, 505240641Sglebius uint16_t sport, uint16_t dport, struct pf_anchor_stackframe *anchor_stack) 506223637Sbz{ 507223637Sbz struct pf_rule *r = NULL; 508240233Sglebius struct pf_addr *naddr; 509240233Sglebius uint16_t *nport; 510223637Sbz 511240233Sglebius PF_RULES_RASSERT(); 512240233Sglebius KASSERT(*skp == NULL, ("*skp not NULL")); 513240233Sglebius KASSERT(*nkp == NULL, ("*nkp not NULL")); 514223637Sbz 515223637Sbz if (direction == PF_OUT) { 516223637Sbz r = pf_match_translation(pd, m, off, direction, kif, saddr, 517240641Sglebius sport, daddr, dport, PF_RULESET_BINAT, anchor_stack); 518223637Sbz if (r == NULL) 519223637Sbz r = pf_match_translation(pd, m, off, direction, kif, 520240641Sglebius saddr, sport, daddr, dport, PF_RULESET_NAT, 521240641Sglebius anchor_stack); 522223637Sbz } else { 523223637Sbz r = pf_match_translation(pd, m, off, direction, kif, saddr, 524240641Sglebius sport, daddr, dport, PF_RULESET_RDR, anchor_stack); 525223637Sbz if (r == NULL) 526223637Sbz r = pf_match_translation(pd, m, off, direction, kif, 527240641Sglebius saddr, sport, daddr, dport, PF_RULESET_BINAT, 528240641Sglebius anchor_stack); 529223637Sbz } 530223637Sbz 531240233Sglebius if (r == NULL) 532240233Sglebius return (NULL); 533223637Sbz 534240233Sglebius switch (r->action) { 535240233Sglebius case PF_NONAT: 536240233Sglebius case PF_NOBINAT: 537240233Sglebius case PF_NORDR: 538240233Sglebius return (NULL); 539240233Sglebius } 540223637Sbz 541240233Sglebius *skp = pf_state_key_setup(pd, saddr, daddr, sport, dport); 542240233Sglebius if (*skp == NULL) 543240233Sglebius return (NULL); 544240233Sglebius *nkp = pf_state_key_clone(*skp); 545240233Sglebius if (*nkp == NULL) { 546240233Sglebius uma_zfree(V_pf_state_key_z, skp); 547240233Sglebius *skp = NULL; 548240233Sglebius return (NULL); 549240233Sglebius } 550223637Sbz 551240233Sglebius /* XXX We only modify one side for now. */ 552240233Sglebius naddr = &(*nkp)->addr[1]; 553240233Sglebius nport = &(*nkp)->port[1]; 554240233Sglebius 555240233Sglebius switch (r->action) { 556240233Sglebius case PF_NAT: 557255143Sglebius if (pf_get_sport(pd->af, pd->proto, r, saddr, sport, daddr, 558255143Sglebius dport, naddr, nport, r->rpool.proxy_port[0], 559240233Sglebius r->rpool.proxy_port[1], sn)) { 560240233Sglebius DPFPRINTF(PF_DEBUG_MISC, 561240233Sglebius ("pf: NAT proxy port allocation (%u-%u) failed\n", 562240233Sglebius r->rpool.proxy_port[0], r->rpool.proxy_port[1])); 563240233Sglebius goto notrans; 564240233Sglebius } 565240233Sglebius break; 566240233Sglebius case PF_BINAT: 567240233Sglebius switch (direction) { 568240233Sglebius case PF_OUT: 569240233Sglebius if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 570240233Sglebius switch (pd->af) { 571223637Sbz#ifdef INET 572240233Sglebius case AF_INET: 573240233Sglebius if (r->rpool.cur->addr.p.dyn-> 574240233Sglebius pfid_acnt4 < 1) 575240233Sglebius goto notrans; 576240233Sglebius PF_POOLMASK(naddr, 577240233Sglebius &r->rpool.cur->addr.p.dyn-> 578240233Sglebius pfid_addr4, 579240233Sglebius &r->rpool.cur->addr.p.dyn-> 580240233Sglebius pfid_mask4, saddr, AF_INET); 581240233Sglebius break; 582223637Sbz#endif /* INET */ 583223637Sbz#ifdef INET6 584240233Sglebius case AF_INET6: 585240233Sglebius if (r->rpool.cur->addr.p.dyn-> 586240233Sglebius pfid_acnt6 < 1) 587240233Sglebius goto notrans; 588240233Sglebius PF_POOLMASK(naddr, 589240233Sglebius &r->rpool.cur->addr.p.dyn-> 590240233Sglebius pfid_addr6, 591240233Sglebius &r->rpool.cur->addr.p.dyn-> 592240233Sglebius pfid_mask6, saddr, AF_INET6); 593240233Sglebius break; 594223637Sbz#endif /* INET6 */ 595240233Sglebius } 596240233Sglebius } else 597240233Sglebius PF_POOLMASK(naddr, 598240233Sglebius &r->rpool.cur->addr.v.a.addr, 599240233Sglebius &r->rpool.cur->addr.v.a.mask, saddr, 600240233Sglebius pd->af); 601240233Sglebius break; 602240233Sglebius case PF_IN: 603240233Sglebius if (r->src.addr.type == PF_ADDR_DYNIFTL) { 604240233Sglebius switch (pd->af) { 605240233Sglebius#ifdef INET 606240233Sglebius case AF_INET: 607240233Sglebius if (r->src.addr.p.dyn-> pfid_acnt4 < 1) 608240233Sglebius goto notrans; 609223637Sbz PF_POOLMASK(naddr, 610240233Sglebius &r->src.addr.p.dyn->pfid_addr4, 611240233Sglebius &r->src.addr.p.dyn->pfid_mask4, 612240233Sglebius daddr, AF_INET); 613240233Sglebius break; 614223637Sbz#endif /* INET */ 615223637Sbz#ifdef INET6 616240233Sglebius case AF_INET6: 617240233Sglebius if (r->src.addr.p.dyn->pfid_acnt6 < 1) 618240233Sglebius goto notrans; 619240233Sglebius PF_POOLMASK(naddr, 620240233Sglebius &r->src.addr.p.dyn->pfid_addr6, 621240233Sglebius &r->src.addr.p.dyn->pfid_mask6, 622240233Sglebius daddr, AF_INET6); 623240233Sglebius break; 624223637Sbz#endif /* INET6 */ 625240233Sglebius } 626240233Sglebius } else 627240233Sglebius PF_POOLMASK(naddr, &r->src.addr.v.a.addr, 628240233Sglebius &r->src.addr.v.a.mask, daddr, pd->af); 629223637Sbz break; 630240233Sglebius } 631240233Sglebius break; 632240233Sglebius case PF_RDR: { 633240233Sglebius if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 634240233Sglebius goto notrans; 635240233Sglebius if ((r->rpool.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK) 636240233Sglebius PF_POOLMASK(naddr, naddr, &r->rpool.cur->addr.v.a.mask, 637240233Sglebius daddr, pd->af); 638223637Sbz 639240233Sglebius if (r->rpool.proxy_port[1]) { 640240233Sglebius uint32_t tmp_nport; 641223637Sbz 642240233Sglebius tmp_nport = ((ntohs(dport) - ntohs(r->dst.port[0])) % 643240233Sglebius (r->rpool.proxy_port[1] - r->rpool.proxy_port[0] + 644240233Sglebius 1)) + r->rpool.proxy_port[0]; 645223637Sbz 646240233Sglebius /* Wrap around if necessary. */ 647240233Sglebius if (tmp_nport > 65535) 648240233Sglebius tmp_nport -= 65535; 649240233Sglebius *nport = htons((uint16_t)tmp_nport); 650240233Sglebius } else if (r->rpool.proxy_port[0]) 651240233Sglebius *nport = htons(r->rpool.proxy_port[0]); 652240233Sglebius break; 653223637Sbz } 654240233Sglebius default: 655240233Sglebius panic("%s: unknown action %u", __func__, r->action); 656240233Sglebius } 657223637Sbz 658240233Sglebius /* Return success only if translation really happened. */ 659240233Sglebius if (bcmp(*skp, *nkp, sizeof(struct pf_state_key_cmp))) 660240233Sglebius return (r); 661240233Sglebius 662240233Sglebiusnotrans: 663240233Sglebius uma_zfree(V_pf_state_key_z, *nkp); 664240233Sglebius uma_zfree(V_pf_state_key_z, *skp); 665240233Sglebius *skp = *nkp = NULL; 666261023Sglebius *sn = NULL; 667240233Sglebius 668240233Sglebius return (NULL); 669223637Sbz} 670