/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2001 Daniel Hartmeier * Copyright (c) 2002 - 2008 Henning Brauer * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * Effort sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F30602-01-2-0537. * * $OpenBSD: pf_lb.c,v 1.2 2009/02/12 02:13:15 sthen Exp $ */ #include #include "opt_pf.h" #include "opt_inet.h" #include "opt_inet6.h" #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #endif #ifdef INET6 #include #endif /* * Limit the amount of work we do to find a free source port for redirects that * introduce a state conflict. */ #define V_pf_rdr_srcport_rewrite_tries VNET(pf_rdr_srcport_rewrite_tries) VNET_DEFINE_STATIC(int, pf_rdr_srcport_rewrite_tries) = 16; #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x static void pf_hash(struct pf_addr *, struct pf_addr *, struct pf_poolhashkey *, sa_family_t); static struct pf_krule *pf_match_translation(struct pf_pdesc *, int, struct pf_kanchor_stackframe *); static int pf_get_sport(struct pf_pdesc *, struct pf_krule *, struct pf_addr *, uint16_t *, uint16_t, uint16_t, struct pf_ksrc_node **, struct pf_srchash **, struct pf_kpool *, struct pf_udp_mapping **); static bool pf_islinklocal(const sa_family_t, const struct pf_addr *); #define mix(a,b,c) \ do { \ a -= b; a -= c; a ^= (c >> 13); \ b -= c; b -= a; b ^= (a << 8); \ c -= a; c -= b; c ^= (b >> 13); \ a -= b; a -= c; a ^= (c >> 12); \ b -= c; b -= a; b ^= (a << 16); \ c -= a; c -= b; c ^= (b >> 5); \ a -= b; a -= c; a ^= (c >> 3); \ b -= c; b -= a; b ^= (a << 10); \ c -= a; c -= b; c ^= (b >> 15); \ } while (0) /* * hash function based on bridge_hash in if_bridge.c */ static void pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, struct pf_poolhashkey *key, sa_family_t af) { u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; switch (af) { #ifdef INET case AF_INET: a += inaddr->addr32[0]; b += key->key32[1]; mix(a, b, c); hash->addr32[0] = c + key->key32[2]; break; #endif /* INET */ #ifdef INET6 case AF_INET6: a += inaddr->addr32[0]; b += inaddr->addr32[2]; mix(a, b, c); hash->addr32[0] = c; a += inaddr->addr32[1]; b += inaddr->addr32[3]; c += key->key32[1]; mix(a, b, c); hash->addr32[1] = c; a += inaddr->addr32[2]; b += inaddr->addr32[1]; c += key->key32[2]; mix(a, b, c); hash->addr32[2] = c; a += inaddr->addr32[3]; b += inaddr->addr32[0]; c += key->key32[3]; mix(a, b, c); hash->addr32[3] = c; break; #endif /* INET6 */ } } static struct pf_krule * pf_match_translation(struct pf_pdesc *pd, int rs_num, struct pf_kanchor_stackframe *anchor_stack) { struct pf_krule *r, *rm = NULL; struct pf_kruleset *ruleset = NULL; int tag = -1; int rtableid = -1; int asd = 0; r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); while (r != NULL) { struct pf_rule_addr *src = NULL, *dst = NULL; struct pf_addr_wrap *xdst = NULL; if (r->action == PF_BINAT && pd->dir == PF_IN) { src = &r->dst; if (r->rdr.cur != NULL) xdst = &r->rdr.cur->addr; } else { src = &r->src; dst = &r->dst; } pf_counter_u64_add(&r->evaluations, 1); if (pfi_kkif_match(r->kif, pd->kif) == r->ifnot) r = r->skip[PF_SKIP_IFP]; else if (r->direction && r->direction != pd->dir) r = r->skip[PF_SKIP_DIR]; else if (r->af && r->af != pd->af) r = r->skip[PF_SKIP_AF]; else if (r->proto && r->proto != pd->proto) r = r->skip[PF_SKIP_PROTO]; else if (PF_MISMATCHAW(&src->addr, &pd->nsaddr, pd->af, src->neg, pd->kif, M_GETFIB(pd->m))) r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : PF_SKIP_DST_ADDR]; else if (src->port_op && !pf_match_port(src->port_op, src->port[0], src->port[1], pd->nsport)) r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : PF_SKIP_DST_PORT]; else if (dst != NULL && PF_MISMATCHAW(&dst->addr, &pd->ndaddr, pd->af, dst->neg, NULL, M_GETFIB(pd->m))) r = r->skip[PF_SKIP_DST_ADDR]; else if (xdst != NULL && PF_MISMATCHAW(xdst, &pd->ndaddr, pd->af, 0, NULL, M_GETFIB(pd->m))) r = TAILQ_NEXT(r, entries); else if (dst != NULL && dst->port_op && !pf_match_port(dst->port_op, dst->port[0], dst->port[1], pd->ndport)) r = r->skip[PF_SKIP_DST_PORT]; else if (r->match_tag && !pf_match_tag(pd->m, r, &tag, pd->pf_mtag ? pd->pf_mtag->tag : 0)) r = TAILQ_NEXT(r, entries); else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, &pd->hdr.tcp), r->os_fingerprint))) r = TAILQ_NEXT(r, entries); else { if (r->tag) tag = r->tag; if (r->rtableid >= 0) rtableid = r->rtableid; if (r->anchor == NULL) { rm = r; if (rm->action == PF_NONAT || rm->action == PF_NORDR || rm->action == PF_NOBINAT) { rm = NULL; } break; } else pf_step_into_anchor(anchor_stack, &asd, &ruleset, rs_num, &r, NULL, NULL); } if (r == NULL) pf_step_out_of_anchor(anchor_stack, &asd, &ruleset, rs_num, &r, NULL, NULL); } if (tag > 0 && pf_tag_packet(pd, tag)) return (NULL); if (rtableid >= 0) M_SETFIB(pd->m, rtableid); return (rm); } static int pf_get_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr, uint16_t *nport, uint16_t low, uint16_t high, struct pf_ksrc_node **sn, struct pf_srchash **sh, struct pf_kpool *rpool, struct pf_udp_mapping **udp_mapping) { struct pf_state_key_cmp key; struct pf_addr init_addr; bzero(&init_addr, sizeof(init_addr)); if (! TAILQ_EMPTY(&r->nat.list) && pf_map_addr_sn(pd->naf, r, &pd->nsaddr, naddr, NULL, &init_addr, sn, sh, &r->nat)) return (1); if (udp_mapping) { MPASS(*udp_mapping == NULL); } /* * If we are UDP and have an existing mapping we can get source port * from the mapping. In this case we have to look up the src_node as * pf_map_addr would. */ if (pd->proto == IPPROTO_UDP && (r->rdr.opts & PF_POOL_ENDPI)) { struct pf_udp_endpoint_cmp udp_source; bzero(&udp_source, sizeof(udp_source)); udp_source.af = pd->af; PF_ACPY(&udp_source.addr, &pd->nsaddr, pd->af); udp_source.port = pd->nsport; if (udp_mapping) { *udp_mapping = pf_udp_mapping_find(&udp_source); if (*udp_mapping) { PF_ACPY(naddr, &(*udp_mapping)->endpoints[1].addr, pd->af); *nport = (*udp_mapping)->endpoints[1].port; /* Try to find a src_node as per pf_map_addr(). */ if (*sn == NULL && r->rdr.opts & PF_POOL_STICKYADDR && (r->rdr.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) *sn = pf_find_src_node(&pd->nsaddr, r, pd->af, sh, false); if (*sn != NULL) PF_SRC_NODE_UNLOCK(*sn); return (0); } else { *udp_mapping = pf_udp_mapping_create(pd->af, &pd->nsaddr, pd->nsport, &init_addr, 0); if (*udp_mapping == NULL) return (1); } } } if (pf_map_addr_sn(pd->af, r, &pd->nsaddr, naddr, NULL, &init_addr, sn, sh, rpool)) goto failed; if (pd->proto == IPPROTO_ICMP) { if (*nport == htons(ICMP_ECHO)) { low = 1; high = 65535; } else return (0); /* Don't try to modify non-echo ICMP */ } #ifdef INET6 if (pd->proto == IPPROTO_ICMPV6) { if (*nport == htons(ICMP6_ECHO_REQUEST)) { low = 1; high = 65535; } else return (0); /* Don't try to modify non-echo ICMP */ } #endif /* INET6 */ bzero(&key, sizeof(key)); key.af = pd->naf; key.proto = pd->proto; key.port[0] = pd->ndport; PF_ACPY(&key.addr[0], &pd->ndaddr, key.af); do { PF_ACPY(&key.addr[1], naddr, key.af); if (udp_mapping && *udp_mapping) PF_ACPY(&(*udp_mapping)->endpoints[1].addr, naddr, pd->af); /* * port search; start random, step; * similar 2 portloop in in_pcbbind */ if (pd->proto == IPPROTO_SCTP) { key.port[1] = pd->nsport; if (!pf_find_state_all_exists(&key, PF_IN)) { *nport = pd->nsport; return (0); } else { return (1); /* Fail mapping. */ } } else if (!(pd->proto == IPPROTO_TCP || pd->proto == IPPROTO_UDP || pd->proto == IPPROTO_ICMP) || (low == 0 && high == 0)) { /* * XXX bug: icmp states don't use the id on both sides. * (traceroute -I through nat) */ key.port[1] = pd->nsport; if (!pf_find_state_all_exists(&key, PF_IN)) { *nport = pd->nsport; return (0); } } else if (low == high) { key.port[1] = htons(low); if (!pf_find_state_all_exists(&key, PF_IN)) { if (udp_mapping && *udp_mapping != NULL) { (*udp_mapping)->endpoints[1].port = htons(low); if (pf_udp_mapping_insert(*udp_mapping) == 0) { *nport = htons(low); return (0); } } else { *nport = htons(low); return (0); } } } else { uint32_t tmp; uint16_t cut; if (low > high) { tmp = low; low = high; high = tmp; } /* low < high */ cut = arc4random() % (1 + high - low) + low; /* low <= cut <= high */ for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) { if (udp_mapping && *udp_mapping != NULL) { (*udp_mapping)->endpoints[1].port = htons(tmp); if (pf_udp_mapping_insert(*udp_mapping) == 0) { *nport = htons(tmp); return (0); } } else { key.port[1] = htons(tmp); if (!pf_find_state_all_exists(&key, PF_IN)) { *nport = htons(tmp); return (0); } } } tmp = cut; for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) { if (pd->proto == IPPROTO_UDP && (r->rdr.opts & PF_POOL_ENDPI && udp_mapping != NULL)) { (*udp_mapping)->endpoints[1].port = htons(tmp); if (pf_udp_mapping_insert(*udp_mapping) == 0) { *nport = htons(tmp); return (0); } } else { key.port[1] = htons(tmp); if (!pf_find_state_all_exists(&key, PF_IN)) { *nport = htons(tmp); return (0); } } } } switch (r->rdr.opts & PF_POOL_TYPEMASK) { case PF_POOL_RANDOM: case PF_POOL_ROUNDROBIN: /* * pick a different source address since we're out * of free port choices for the current one. */ (*sn) = NULL; if (pf_map_addr_sn(pd->af, r, &pd->nsaddr, naddr, NULL, &init_addr, sn, sh, &r->rdr)) return (1); break; case PF_POOL_NONE: case PF_POOL_SRCHASH: case PF_POOL_BITMASK: default: return (1); } } while (! PF_AEQ(&init_addr, naddr, pd->naf) ); failed: if (udp_mapping) { uma_zfree(V_pf_udp_mapping_z, *udp_mapping); *udp_mapping = NULL; } return (1); /* none available */ } static bool pf_islinklocal(const sa_family_t af, const struct pf_addr *addr) { if (af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&addr->v6)) return (true); return (false); } static int pf_get_mape_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr, uint16_t *nport, struct pf_ksrc_node **sn, struct pf_srchash **sh, struct pf_udp_mapping **udp_mapping) { uint16_t psmask, low, highmask; uint16_t i, ahigh, cut; int ashift, psidshift; ashift = 16 - r->rdr.mape.offset; psidshift = ashift - r->rdr.mape.psidlen; psmask = r->rdr.mape.psid & ((1U << r->rdr.mape.psidlen) - 1); psmask = psmask << psidshift; highmask = (1U << psidshift) - 1; ahigh = (1U << r->rdr.mape.offset) - 1; cut = arc4random() & ahigh; if (cut == 0) cut = 1; for (i = cut; i <= ahigh; i++) { low = (i << ashift) | psmask; if (!pf_get_sport(pd, r, naddr, nport, low, low | highmask, sn, sh, &r->rdr, udp_mapping)) return (0); } for (i = cut - 1; i > 0; i--) { low = (i << ashift) | psmask; if (!pf_get_sport(pd, r, naddr, nport, low, low | highmask, sn, sh, &r->rdr, udp_mapping)) return (0); } return (1); } u_short pf_map_addr(sa_family_t af, struct pf_krule *r, struct pf_addr *saddr, struct pf_addr *naddr, struct pfi_kkif **nkif, struct pf_addr *init_addr, struct pf_kpool *rpool) { u_short reason = PFRES_MATCH; struct pf_addr *raddr = NULL, *rmask = NULL; mtx_lock(&rpool->mtx); /* Find the route using chosen algorithm. Store the found route in src_node if it was given or found. */ if (rpool->cur->addr.type == PF_ADDR_NOROUTE) { reason = PFRES_MAPFAILED; goto done_pool_mtx; } if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { switch (af) { #ifdef INET case AF_INET: if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) { reason = PFRES_MAPFAILED; goto done_pool_mtx; } raddr = &rpool->cur->addr.p.dyn->pfid_addr4; rmask = &rpool->cur->addr.p.dyn->pfid_mask4; break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) { reason = PFRES_MAPFAILED; goto done_pool_mtx; } raddr = &rpool->cur->addr.p.dyn->pfid_addr6; rmask = &rpool->cur->addr.p.dyn->pfid_mask6; break; #endif /* INET6 */ } } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) { reason = PFRES_MAPFAILED; goto done_pool_mtx; /* unsupported */ } } else { raddr = &rpool->cur->addr.v.a.addr; rmask = &rpool->cur->addr.v.a.mask; } switch (rpool->opts & PF_POOL_TYPEMASK) { case PF_POOL_NONE: PF_ACPY(naddr, raddr, af); break; case PF_POOL_BITMASK: PF_POOLMASK(naddr, raddr, rmask, saddr, af); break; case PF_POOL_RANDOM: if (init_addr != NULL && PF_AZERO(init_addr, af)) { switch (af) { #ifdef INET case AF_INET: rpool->counter.addr32[0] = htonl(arc4random()); break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (rmask->addr32[3] != 0xffffffff) rpool->counter.addr32[3] = htonl(arc4random()); else break; if (rmask->addr32[2] != 0xffffffff) rpool->counter.addr32[2] = htonl(arc4random()); else break; if (rmask->addr32[1] != 0xffffffff) rpool->counter.addr32[1] = htonl(arc4random()); else break; if (rmask->addr32[0] != 0xffffffff) rpool->counter.addr32[0] = htonl(arc4random()); break; #endif /* INET6 */ } PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); PF_ACPY(init_addr, naddr, af); } else { PF_AINC(&rpool->counter, af); PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); } break; case PF_POOL_SRCHASH: { unsigned char hash[16]; pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); break; } case PF_POOL_ROUNDROBIN: { struct pf_kpooladdr *acur = rpool->cur; if (rpool->cur->addr.type == PF_ADDR_TABLE) { if (!pfr_pool_get(rpool->cur->addr.p.tbl, &rpool->tblidx, &rpool->counter, af, NULL)) goto get_addr; } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, &rpool->tblidx, &rpool->counter, af, pf_islinklocal)) goto get_addr; } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) goto get_addr; try_next: if (TAILQ_NEXT(rpool->cur, entries) == NULL) rpool->cur = TAILQ_FIRST(&rpool->list); else rpool->cur = TAILQ_NEXT(rpool->cur, entries); if (rpool->cur->addr.type == PF_ADDR_TABLE) { if (pfr_pool_get(rpool->cur->addr.p.tbl, &rpool->tblidx, &rpool->counter, af, NULL)) { /* table contains no address of type 'af' */ if (rpool->cur != acur) goto try_next; reason = PFRES_MAPFAILED; goto done_pool_mtx; } } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { rpool->tblidx = -1; if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, &rpool->tblidx, &rpool->counter, af, pf_islinklocal)) { /* table contains no address of type 'af' */ if (rpool->cur != acur) goto try_next; reason = PFRES_MAPFAILED; goto done_pool_mtx; } } else { raddr = &rpool->cur->addr.v.a.addr; rmask = &rpool->cur->addr.v.a.mask; PF_ACPY(&rpool->counter, raddr, af); } get_addr: PF_ACPY(naddr, &rpool->counter, af); if (init_addr != NULL && PF_AZERO(init_addr, af)) PF_ACPY(init_addr, naddr, af); PF_AINC(&rpool->counter, af); break; } } if (nkif) *nkif = rpool->cur->kif; done_pool_mtx: mtx_unlock(&rpool->mtx); if (reason) { counter_u64_add(V_pf_status.counters[reason], 1); } return (reason); } u_short pf_map_addr_sn(sa_family_t af, struct pf_krule *r, struct pf_addr *saddr, struct pf_addr *naddr, struct pfi_kkif **nkif, struct pf_addr *init_addr, struct pf_ksrc_node **sn, struct pf_srchash **sh, struct pf_kpool *rpool) { u_short reason = 0; KASSERT(*sn == NULL, ("*sn not NULL")); /* * If this is a sticky-address rule, try to find an existing src_node. * Request the sh to be unlocked if sn was not found, as we never * insert a new sn when parsing the ruleset. */ if (r->rdr.opts & PF_POOL_STICKYADDR && (r->rdr.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) *sn = pf_find_src_node(saddr, r, af, sh, false); if (*sn != NULL) { PF_SRC_NODE_LOCK_ASSERT(*sn); /* If the supplied address is the same as the current one we've * been asked before, so tell the caller that there's no other * address to be had. */ if (PF_AEQ(naddr, &(*sn)->raddr, af)) { reason = PFRES_MAPFAILED; goto done; } PF_ACPY(naddr, &(*sn)->raddr, af); if (nkif) *nkif = (*sn)->rkif; if (V_pf_status.debug >= PF_DEBUG_NOISY) { printf("pf_map_addr: src tracking maps "); pf_print_host(saddr, 0, af); printf(" to "); pf_print_host(naddr, 0, af); if (nkif) printf("@%s", (*nkif)->pfik_name); printf("\n"); } goto done; } /* * Source node has not been found. Find a new address and store it * in variables given by the caller. */ if (pf_map_addr(af, r, saddr, naddr, nkif, init_addr, rpool) != 0) { /* pf_map_addr() sets reason counters on its own */ goto done; } if (V_pf_status.debug >= PF_DEBUG_NOISY && (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { printf("pf_map_addr: selected address "); pf_print_host(naddr, 0, af); if (nkif) printf("@%s", (*nkif)->pfik_name); printf("\n"); } done: if ((*sn) != NULL) PF_SRC_NODE_UNLOCK(*sn); if (reason) { counter_u64_add(V_pf_status.counters[reason], 1); } return (reason); } u_short pf_get_translation(struct pf_pdesc *pd, int off, struct pf_state_key **skp, struct pf_state_key **nkp, struct pf_kanchor_stackframe *anchor_stack, struct pf_krule **rp, struct pf_udp_mapping **udp_mapping) { struct pf_krule *r = NULL; struct pf_addr *naddr; struct pf_ksrc_node *sn = NULL; struct pf_srchash *sh = NULL; uint16_t *nportp; uint16_t low, high; u_short reason; PF_RULES_RASSERT(); KASSERT(*skp == NULL, ("*skp not NULL")); KASSERT(*nkp == NULL, ("*nkp not NULL")); *rp = NULL; if (pd->dir == PF_OUT) { r = pf_match_translation(pd, PF_RULESET_BINAT, anchor_stack); if (r == NULL) r = pf_match_translation(pd, PF_RULESET_NAT, anchor_stack); } else { r = pf_match_translation(pd, PF_RULESET_RDR, anchor_stack); if (r == NULL) r = pf_match_translation(pd, PF_RULESET_BINAT, anchor_stack); } if (r == NULL) return (PFRES_MAX); switch (r->action) { case PF_NONAT: case PF_NOBINAT: case PF_NORDR: return (PFRES_MAX); } if (pf_state_key_setup(pd, pd->nsport, pd->ndport, skp, nkp)) return (PFRES_MEMORY); naddr = &(*nkp)->addr[1]; nportp = &(*nkp)->port[1]; switch (r->action) { case PF_NAT: if (pd->proto == IPPROTO_ICMP) { low = 1; high = 65535; } else { low = r->rdr.proxy_port[0]; high = r->rdr.proxy_port[1]; } if (r->rdr.mape.offset > 0) { if (pf_get_mape_sport(pd, r, naddr, nportp, &sn, &sh, udp_mapping)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: MAP-E port allocation (%u/%u/%u)" " failed\n", r->rdr.mape.offset, r->rdr.mape.psidlen, r->rdr.mape.psid)); reason = PFRES_MAPFAILED; goto notrans; } } else if (pf_get_sport(pd, r, naddr, nportp, low, high, &sn, &sh, &r->rdr, udp_mapping)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: NAT proxy port allocation (%u-%u) failed\n", r->rdr.proxy_port[0], r->rdr.proxy_port[1])); reason = PFRES_MAPFAILED; goto notrans; } break; case PF_BINAT: switch (pd->dir) { case PF_OUT: if (r->rdr.cur->addr.type == PF_ADDR_DYNIFTL){ switch (pd->af) { #ifdef INET case AF_INET: if (r->rdr.cur->addr.p.dyn-> pfid_acnt4 < 1) { reason = PFRES_MAPFAILED; goto notrans; } PF_POOLMASK(naddr, &r->rdr.cur->addr.p.dyn-> pfid_addr4, &r->rdr.cur->addr.p.dyn-> pfid_mask4, &pd->nsaddr, AF_INET); break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (r->rdr.cur->addr.p.dyn-> pfid_acnt6 < 1) { reason = PFRES_MAPFAILED; goto notrans; } PF_POOLMASK(naddr, &r->rdr.cur->addr.p.dyn-> pfid_addr6, &r->rdr.cur->addr.p.dyn-> pfid_mask6, &pd->nsaddr, AF_INET6); break; #endif /* INET6 */ } } else PF_POOLMASK(naddr, &r->rdr.cur->addr.v.a.addr, &r->rdr.cur->addr.v.a.mask, &pd->nsaddr, pd->af); break; case PF_IN: if (r->src.addr.type == PF_ADDR_DYNIFTL) { switch (pd->af) { #ifdef INET case AF_INET: if (r->src.addr.p.dyn->pfid_acnt4 < 1) { reason = PFRES_MAPFAILED; goto notrans; } PF_POOLMASK(naddr, &r->src.addr.p.dyn->pfid_addr4, &r->src.addr.p.dyn->pfid_mask4, &pd->ndaddr, AF_INET); break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (r->src.addr.p.dyn->pfid_acnt6 < 1) { reason = PFRES_MAPFAILED; goto notrans; } PF_POOLMASK(naddr, &r->src.addr.p.dyn->pfid_addr6, &r->src.addr.p.dyn->pfid_mask6, &pd->ndaddr, AF_INET6); break; #endif /* INET6 */ } } else PF_POOLMASK(naddr, &r->src.addr.v.a.addr, &r->src.addr.v.a.mask, &pd->ndaddr, pd->af); break; } break; case PF_RDR: { struct pf_state_key_cmp key; int tries; uint16_t cut, low, high, nport; reason = pf_map_addr_sn(pd->af, r, &pd->nsaddr, naddr, NULL, NULL, &sn, &sh, &r->rdr); if (reason != 0) goto notrans; if ((r->rdr.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK) PF_POOLMASK(naddr, naddr, &r->rdr.cur->addr.v.a.mask, &pd->ndaddr, pd->af); /* Do not change SCTP ports. */ if (pd->proto == IPPROTO_SCTP) break; if (r->rdr.proxy_port[1]) { uint32_t tmp_nport; tmp_nport = ((ntohs(pd->ndport) - ntohs(r->dst.port[0])) % (r->rdr.proxy_port[1] - r->rdr.proxy_port[0] + 1)) + r->rdr.proxy_port[0]; /* Wrap around if necessary. */ if (tmp_nport > 65535) tmp_nport -= 65535; nport = htons((uint16_t)tmp_nport); } else if (r->rdr.proxy_port[0]) nport = htons(r->rdr.proxy_port[0]); else nport = pd->ndport; /* * Update the destination port. */ *nportp = nport; /* * Do we have a source port conflict in the stack state? Try to * modulate the source port if so. Note that this is racy since * the state lookup may not find any matches here but will once * pf_create_state() actually instantiates the state. */ bzero(&key, sizeof(key)); key.af = pd->af; key.proto = pd->proto; key.port[0] = pd->nsport; PF_ACPY(&key.addr[0], &pd->nsaddr, key.af); key.port[1] = nport; PF_ACPY(&key.addr[1], naddr, key.af); if (!pf_find_state_all_exists(&key, PF_OUT)) break; tries = 0; low = 50001; /* XXX-MJ PF_NAT_PROXY_PORT_LOW/HIGH */ high = 65535; cut = arc4random() % (1 + high - low) + low; for (uint32_t tmp = cut; tmp <= high && tmp <= UINT16_MAX && tries < V_pf_rdr_srcport_rewrite_tries; tmp++, tries++) { key.port[0] = htons(tmp); if (!pf_find_state_all_exists(&key, PF_OUT)) { /* Update the source port. */ (*nkp)->port[0] = htons(tmp); goto out; } } for (uint32_t tmp = cut - 1; tmp >= low && tries < V_pf_rdr_srcport_rewrite_tries; tmp--, tries++) { key.port[0] = htons(tmp); if (!pf_find_state_all_exists(&key, PF_OUT)) { /* Update the source port. */ (*nkp)->port[0] = htons(tmp); goto out; } } /* * We failed to find a match. Push on ahead anyway, let * pf_state_insert() be the arbiter of whether the state * conflict is tolerable. In particular, with TCP connections * the state may be reused if the TCP state is terminal. */ DPFPRINTF(PF_DEBUG_MISC, ("pf: RDR source port allocation failed\n")); break; out: DPFPRINTF(PF_DEBUG_MISC, ("pf: RDR source port allocation %u->%u\n", ntohs(pd->nsport), ntohs((*nkp)->port[0]))); break; } default: panic("%s: unknown action %u", __func__, r->action); } /* Return success only if translation really happened. */ if (bcmp(*skp, *nkp, sizeof(struct pf_state_key_cmp))) { *rp = r; return (PFRES_MATCH); } reason = PFRES_MAX; notrans: uma_zfree(V_pf_state_key_z, *nkp); uma_zfree(V_pf_state_key_z, *skp); *skp = *nkp = NULL; return (reason); } int pf_get_transaddr_af(struct pf_krule *r, struct pf_pdesc *pd) { #if defined(INET) && defined(INET6) struct pf_addr ndaddr, nsaddr, naddr; u_int16_t nport = 0; int prefixlen = 96; struct pf_srchash *sh = NULL; struct pf_ksrc_node *sns = NULL; if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: af-to %s %s, ", pd->naf == AF_INET ? "inet" : "inet6", TAILQ_EMPTY(&r->rdr.list) ? "nat" : "rdr"); pf_print_host(&pd->nsaddr, pd->nsport, pd->af); printf(" -> "); pf_print_host(&pd->ndaddr, pd->ndport, pd->af); printf("\n"); } if (TAILQ_EMPTY(&r->nat.list)) panic("pf_get_transaddr_af: no nat pool for source address"); /* get source address and port */ if (pf_get_sport(pd, r, &nsaddr, &nport, r->nat.proxy_port[0], r->nat.proxy_port[1], &sns, &sh, &r->nat, NULL)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: af-to NAT proxy port allocation (%u-%u) failed", r->nat.proxy_port[0], r->nat.proxy_port[1])); return (-1); } if (pd->proto == IPPROTO_ICMPV6 && pd->naf == AF_INET) { if (pd->dir == PF_IN) { NTOHS(pd->ndport); if (pd->ndport == ICMP6_ECHO_REQUEST) pd->ndport = ICMP_ECHO; else if (pd->ndport == ICMP6_ECHO_REPLY) pd->ndport = ICMP_ECHOREPLY; HTONS(pd->ndport); } else { NTOHS(pd->nsport); if (pd->nsport == ICMP6_ECHO_REQUEST) pd->nsport = ICMP_ECHO; else if (pd->nsport == ICMP6_ECHO_REPLY) pd->nsport = ICMP_ECHOREPLY; HTONS(pd->nsport); } } else if (pd->proto == IPPROTO_ICMP && pd->naf == AF_INET6) { if (pd->dir == PF_IN) { NTOHS(pd->ndport); if (pd->ndport == ICMP_ECHO) pd->ndport = ICMP6_ECHO_REQUEST; else if (pd->ndport == ICMP_ECHOREPLY) pd->ndport = ICMP6_ECHO_REPLY; HTONS(pd->ndport); } else { NTOHS(pd->nsport); if (pd->nsport == ICMP_ECHO) pd->nsport = ICMP6_ECHO_REQUEST; else if (pd->nsport == ICMP_ECHOREPLY) pd->nsport = ICMP6_ECHO_REPLY; HTONS(pd->nsport); } } /* get the destination address and port */ if (! TAILQ_EMPTY(&r->rdr.list)) { if (pf_map_addr_sn(pd->naf, r, &nsaddr, &naddr, NULL, NULL, &sns, NULL, &r->rdr)) return (-1); if (r->rdr.proxy_port[0]) pd->ndport = htons(r->rdr.proxy_port[0]); if (pd->naf == AF_INET) { /* The prefix is the IPv4 rdr address */ prefixlen = in_mask2len( (struct in_addr *)&r->rdr.cur->addr.v.a.mask); inet_nat46(pd->naf, &pd->ndaddr, &ndaddr, &naddr, prefixlen); } else { /* The prefix is the IPv6 rdr address */ prefixlen = in6_mask2len( (struct in6_addr *)&r->rdr.cur->addr.v.a.mask, NULL); inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &naddr, prefixlen); } } else { if (pd->naf == AF_INET) { /* The prefix is the IPv6 dst address */ prefixlen = in6_mask2len( (struct in6_addr *)&r->dst.addr.v.a.mask, NULL); if (prefixlen < 32) prefixlen = 96; inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &pd->ndaddr, prefixlen); } else { /* * The prefix is the IPv6 nat address * (that was stored in pd->nsaddr) */ prefixlen = in6_mask2len( (struct in6_addr *)&r->nat.cur->addr.v.a.mask, NULL); if (prefixlen > 96) prefixlen = 96; inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &nsaddr, prefixlen); } } PF_ACPY(&pd->nsaddr, &nsaddr, pd->naf); PF_ACPY(&pd->ndaddr, &ndaddr, pd->naf); if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: af-to %s done, prefixlen %d, ", pd->naf == AF_INET ? "inet" : "inet6", prefixlen); pf_print_host(&pd->nsaddr, pd->nsport, pd->naf); printf(" -> "); pf_print_host(&pd->ndaddr, pd->ndport, pd->naf); printf("\n"); } return (0); #else return (-1); #endif }