--- sys/netpfil/pf/pf.c.orig +++ sys/netpfil/pf/pf.c @@ -291,6 +291,8 @@ u_int16_t, u_int8_t, sa_family_t); static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, struct tcphdr *, struct pf_state_peer *); +int pf_icmp_mapping(struct pf_pdesc *, u_int8_t, int *, + int *, u_int16_t *, u_int16_t *); static void pf_change_icmp(struct pf_addr *, u_int16_t *, struct pf_addr *, struct pf_addr *, u_int16_t, u_int16_t *, u_int16_t *, u_int16_t *, @@ -337,6 +339,10 @@ static int pf_test_state_udp(struct pf_kstate **, struct pfi_kkif *, struct mbuf *, int, void *, struct pf_pdesc *); +int pf_icmp_state_lookup(struct pf_state_key_cmp *, + struct pf_pdesc *, struct pf_kstate **, struct mbuf *, + int, struct pfi_kkif *, u_int16_t, u_int16_t, + int, int *, int); static int pf_test_state_icmp(struct pf_kstate **, struct pfi_kkif *, struct mbuf *, int, void *, struct pf_pdesc *, u_short *); @@ -389,6 +395,8 @@ VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]); +enum { PF_ICMP_MULTI_NONE, PF_ICMP_MULTI_SOLICITED, PF_ICMP_MULTI_LINK }; + #define PACKET_UNDO_NAT(_m, _pd, _off, _s) \ do { \ struct pf_state_key *nk; \ @@ -1734,6 +1742,172 @@ return (false); } +int +pf_icmp_mapping(struct pf_pdesc *pd, u_int8_t type, + int *icmp_dir, int *multi, u_int16_t *virtual_id, u_int16_t *virtual_type) +{ + /* + * ICMP types marked with PF_OUT are typically responses to + * PF_IN, and will match states in the opposite direction. + * PF_IN ICMP types need to match a state with that type. + */ + *icmp_dir = PF_OUT; + *multi = PF_ICMP_MULTI_LINK; + /* Queries (and responses) */ + switch (pd->af) { +#ifdef INET + case AF_INET: + switch (type) { + case ICMP_ECHO: + *icmp_dir = PF_IN; + case ICMP_ECHOREPLY: + *virtual_type = ICMP_ECHO; + *virtual_id = pd->hdr.icmp.icmp_id; + break; + + case ICMP_TSTAMP: + *icmp_dir = PF_IN; + case ICMP_TSTAMPREPLY: + *virtual_type = ICMP_TSTAMP; + *virtual_id = pd->hdr.icmp.icmp_id; + break; + + case ICMP_IREQ: + *icmp_dir = PF_IN; + case ICMP_IREQREPLY: + *virtual_type = ICMP_IREQ; + *virtual_id = pd->hdr.icmp.icmp_id; + break; + + case ICMP_MASKREQ: + *icmp_dir = PF_IN; + case ICMP_MASKREPLY: + *virtual_type = ICMP_MASKREQ; + *virtual_id = pd->hdr.icmp.icmp_id; + break; + + case ICMP_IPV6_WHEREAREYOU: + *icmp_dir = PF_IN; + case ICMP_IPV6_IAMHERE: + *virtual_type = ICMP_IPV6_WHEREAREYOU; + *virtual_id = 0; /* Nothing sane to match on! */ + break; + + case ICMP_MOBILE_REGREQUEST: + *icmp_dir = PF_IN; + case ICMP_MOBILE_REGREPLY: + *virtual_type = ICMP_MOBILE_REGREQUEST; + *virtual_id = 0; /* Nothing sane to match on! */ + break; + + case ICMP_ROUTERSOLICIT: + *icmp_dir = PF_IN; + case ICMP_ROUTERADVERT: + *virtual_type = ICMP_ROUTERSOLICIT; + *virtual_id = 0; /* Nothing sane to match on! */ + break; + + /* These ICMP types map to other connections */ + case ICMP_UNREACH: + case ICMP_SOURCEQUENCH: + case ICMP_REDIRECT: + case ICMP_TIMXCEED: + case ICMP_PARAMPROB: + /* These will not be used, but set them anyway */ + *icmp_dir = PF_IN; + *virtual_type = type; + *virtual_id = 0; + HTONS(*virtual_type); + return (1); /* These types match to another state */ + + /* + * All remaining ICMP types get their own states, + * and will only match in one direction. + */ + default: + *icmp_dir = PF_IN; + *virtual_type = type; + *virtual_id = 0; + break; + } + break; +#endif /* INET */ +#ifdef INET6 + case AF_INET6: + switch (type) { + case ICMP6_ECHO_REQUEST: + *icmp_dir = PF_IN; + case ICMP6_ECHO_REPLY: + *virtual_type = ICMP6_ECHO_REQUEST; + *virtual_id = pd->hdr.icmp6.icmp6_id; + break; + + case MLD_LISTENER_QUERY: + case MLD_LISTENER_REPORT: { + /* + * Listener Report can be sent by clients + * without an associated Listener Query. + * In addition to that, when Report is sent as a + * reply to a Query its source and destination + * address are different. + */ + *icmp_dir = PF_IN; + *virtual_type = MLD_LISTENER_QUERY; + *virtual_id = 0; + break; + } + case MLD_MTRACE: + *icmp_dir = PF_IN; + case MLD_MTRACE_RESP: + *virtual_type = MLD_MTRACE; + *virtual_id = 0; /* Nothing sane to match on! */ + break; + + case ND_NEIGHBOR_SOLICIT: + *icmp_dir = PF_IN; + case ND_NEIGHBOR_ADVERT: { + *virtual_type = ND_NEIGHBOR_SOLICIT; + *virtual_id = 0; + break; + } + + /* + * These ICMP types map to other connections. + * ND_REDIRECT can't be in this list because the triggering + * packet header is optional. + */ + case ICMP6_DST_UNREACH: + case ICMP6_PACKET_TOO_BIG: + case ICMP6_TIME_EXCEEDED: + case ICMP6_PARAM_PROB: + /* These will not be used, but set them anyway */ + *icmp_dir = PF_IN; + *virtual_type = type; + *virtual_id = 0; + HTONS(*virtual_type); + return (1); /* These types match to another state */ + /* + * All remaining ICMP6 types get their own states, + * and will only match in one direction. + */ + default: + *icmp_dir = PF_IN; + *virtual_type = type; + *virtual_id = 0; + break; + } + break; +#endif /* INET6 */ + default: + *icmp_dir = PF_IN; + *virtual_type = type; + *virtual_id = 0; + break; + } + HTONS(*virtual_type); + return (0); /* These types match to their own state */ +} + void pf_intr(void *v) { @@ -4397,8 +4571,8 @@ int tag = -1; int asd = 0; int match = 0; - int state_icmp = 0; - u_int16_t sport = 0, dport = 0; + int state_icmp = 0, icmp_dir, multi; + u_int16_t sport = 0, dport = 0, virtual_type, virtual_id; u_int16_t bproto_sum = 0, bip_sum = 0; u_int8_t icmptype = 0, icmpcode = 0; struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE]; @@ -4432,33 +4606,37 @@ case IPPROTO_ICMP: if (pd->af != AF_INET) break; - sport = dport = pd->hdr.icmp.icmp_id; hdrlen = sizeof(pd->hdr.icmp); icmptype = pd->hdr.icmp.icmp_type; icmpcode = pd->hdr.icmp.icmp_code; - - if (icmptype == ICMP_UNREACH || - icmptype == ICMP_SOURCEQUENCH || - icmptype == ICMP_REDIRECT || - icmptype == ICMP_TIMXCEED || - icmptype == ICMP_PARAMPROB) - state_icmp++; + state_icmp = pf_icmp_mapping(pd, icmptype, + &icmp_dir, &multi, &virtual_id, &virtual_type); + if (icmp_dir == PF_IN) { + sport = virtual_id; + dport = virtual_type; + } else { + sport = virtual_type; + dport = virtual_id; + } break; #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: if (af != AF_INET6) break; - sport = dport = pd->hdr.icmp6.icmp6_id; hdrlen = sizeof(pd->hdr.icmp6); icmptype = pd->hdr.icmp6.icmp6_type; icmpcode = pd->hdr.icmp6.icmp6_code; + state_icmp = pf_icmp_mapping(pd, icmptype, + &icmp_dir, &multi, &virtual_id, &virtual_type); + if (icmp_dir == PF_IN) { + sport = virtual_id; + dport = virtual_type; + } else { + sport = virtual_type; + dport = virtual_id; + } - if (icmptype == ICMP6_DST_UNREACH || - icmptype == ICMP6_PACKET_TOO_BIG || - icmptype == ICMP6_TIME_EXCEEDED || - icmptype == ICMP6_PARAM_PROB) - state_icmp++; break; #endif /* INET6 */ default: @@ -4552,7 +4730,6 @@ } #ifdef INET case IPPROTO_ICMP: - nk->port[0] = nk->port[1]; if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) pf_change_a(&saddr->v4.s_addr, pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 0); @@ -4561,11 +4738,12 @@ pf_change_a(&daddr->v4.s_addr, pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 0); - if (nk->port[1] != pd->hdr.icmp.icmp_id) { + if (virtual_type == htons(ICMP_ECHO) && + nk->port[pd->sidx] != pd->hdr.icmp.icmp_id) { pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( pd->hdr.icmp.icmp_cksum, sport, - nk->port[1], 0); - pd->hdr.icmp.icmp_id = nk->port[1]; + nk->port[pd->sidx], 0); + pd->hdr.icmp.icmp_id = nk->port[pd->sidx]; pd->sport = &pd->hdr.icmp.icmp_id; } m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); @@ -4573,7 +4751,6 @@ #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: - nk->port[0] = nk->port[1]; if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) pf_change_a6(saddr, &pd->hdr.icmp6.icmp6_cksum, &nk->addr[pd->sidx], 0); @@ -6402,15 +6579,73 @@ return (pf_multihome_scan(m, start, len, pd, kif, SCTP_ADD_IP_ADDRESS)); } +int +pf_icmp_state_lookup(struct pf_state_key_cmp *key, struct pf_pdesc *pd, + struct pf_kstate **state, struct mbuf *m, int direction, struct pfi_kkif *kif, + u_int16_t icmpid, u_int16_t type, int icmp_dir, int *iidx, int multi) +{ + key->af = pd->af; + key->proto = pd->proto; + if (icmp_dir == PF_IN) { + *iidx = pd->sidx; + key->port[pd->sidx] = icmpid; + key->port[pd->didx] = type; + } else { + *iidx = pd->didx; + key->port[pd->sidx] = type; + key->port[pd->didx] = icmpid; + } + if (pd->af == AF_INET6 && multi != PF_ICMP_MULTI_NONE) { + switch (multi) { + case PF_ICMP_MULTI_SOLICITED: + key->addr[pd->sidx].addr32[0] = IPV6_ADDR_INT32_MLL; + key->addr[pd->sidx].addr32[1] = 0; + key->addr[pd->sidx].addr32[2] = IPV6_ADDR_INT32_ONE; + key->addr[pd->sidx].addr32[3] = pd->src->addr32[3]; + key->addr[pd->sidx].addr8[12] = 0xff; + break; + case PF_ICMP_MULTI_LINK: + key->addr[pd->sidx].addr32[0] = IPV6_ADDR_INT32_MLL; + key->addr[pd->sidx].addr32[1] = 0; + key->addr[pd->sidx].addr32[2] = 0; + key->addr[pd->sidx].addr32[3] = IPV6_ADDR_INT32_ONE; + break; + } + } else + PF_ACPY(&key->addr[pd->sidx], pd->src, key->af); + PF_ACPY(&key->addr[pd->didx], pd->dst, key->af); + + STATE_LOOKUP(kif, key, *state, pd); + + /* Is this ICMP message flowing in right direction? */ + if ((*state)->rule.ptr->type && + (((*state)->direction == direction) ? + PF_IN : PF_OUT) != icmp_dir) { + if (V_pf_status.debug >= PF_DEBUG_MISC) { + printf("pf: icmp type %d in wrong direction (%d): ", + icmp_dir, pd->dir); + pf_print_state(*state); + printf("\n"); + } + return (PF_DROP); + } + return (-1); +} + static int pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) { struct pf_addr *saddr = pd->src, *daddr = pd->dst; - u_int16_t icmpid = 0, *icmpsum; + u_int16_t *icmpsum, virtual_id, virtual_type; u_int8_t icmptype, icmpcode; - int state_icmp = 0; + int icmp_dir, iidx, ret, multi; struct pf_state_key_cmp key; +#ifdef INET + u_int16_t icmpid; +#endif + + MPASS(*state == NULL); bzero(&key, sizeof(key)); switch (pd->proto) { @@ -6420,49 +6655,43 @@ icmpcode = pd->hdr.icmp.icmp_code; icmpid = pd->hdr.icmp.icmp_id; icmpsum = &pd->hdr.icmp.icmp_cksum; - - if (icmptype == ICMP_UNREACH || - icmptype == ICMP_SOURCEQUENCH || - icmptype == ICMP_REDIRECT || - icmptype == ICMP_TIMXCEED || - icmptype == ICMP_PARAMPROB) - state_icmp++; break; #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: icmptype = pd->hdr.icmp6.icmp6_type; icmpcode = pd->hdr.icmp6.icmp6_code; +#ifdef INET icmpid = pd->hdr.icmp6.icmp6_id; +#endif icmpsum = &pd->hdr.icmp6.icmp6_cksum; - - if (icmptype == ICMP6_DST_UNREACH || - icmptype == ICMP6_PACKET_TOO_BIG || - icmptype == ICMP6_TIME_EXCEEDED || - icmptype == ICMP6_PARAM_PROB) - state_icmp++; break; #endif /* INET6 */ } - if (!state_icmp) { + if (pf_icmp_mapping(pd, icmptype, &icmp_dir, &multi, + &virtual_id, &virtual_type) == 0) { /* * ICMP query/reply message not related to a TCP/UDP packet. * Search for an ICMP state. */ - key.af = pd->af; - key.proto = pd->proto; - key.port[0] = key.port[1] = icmpid; - if (pd->dir == PF_IN) { /* wire side, straight */ - PF_ACPY(&key.addr[0], pd->src, key.af); - PF_ACPY(&key.addr[1], pd->dst, key.af); - } else { /* stack side, reverse */ - PF_ACPY(&key.addr[1], pd->src, key.af); - PF_ACPY(&key.addr[0], pd->dst, key.af); + ret = pf_icmp_state_lookup(&key, pd, state, m, pd->dir, + kif, virtual_id, virtual_type, icmp_dir, &iidx, + PF_ICMP_MULTI_NONE); + if (ret >= 0) { + if (ret == PF_DROP && pd->af == AF_INET6 && + icmp_dir == PF_OUT) { + if (*state != NULL) + PF_STATE_UNLOCK((*state)); + ret = pf_icmp_state_lookup(&key, pd, state, m, + pd->dir, kif, virtual_id, virtual_type, + icmp_dir, &iidx, multi); + if (ret >= 0) + return (ret); + } else + return (ret); } - STATE_LOOKUP(kif, &key, *state, pd); - (*state)->expire = time_uptime; (*state)->timeout = PFTM_ICMP_ERROR_REPLY; @@ -6485,14 +6714,14 @@ pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 0); - if (nk->port[0] != + if (nk->port[iidx] != pd->hdr.icmp.icmp_id) { pd->hdr.icmp.icmp_cksum = pf_cksum_fixup( pd->hdr.icmp.icmp_cksum, icmpid, - nk->port[pd->sidx], 0); + nk->port[iidx], 0); pd->hdr.icmp.icmp_id = - nk->port[pd->sidx]; + nk->port[iidx]; } m_copyback(m, off, ICMP_MINLEN, @@ -6857,13 +7086,15 @@ return (PF_DROP); } - key.af = pd2.af; - key.proto = IPPROTO_ICMP; - PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); - PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); - key.port[0] = key.port[1] = iih.icmp_id; + icmpid = iih.icmp_id; + pf_icmp_mapping(&pd2, iih.icmp_type, + &icmp_dir, &multi, &virtual_id, &virtual_type); - STATE_LOOKUP(kif, &key, *state, pd); + ret = pf_icmp_state_lookup(&key, &pd2, state, m, + pd->dir, kif, virtual_id, virtual_type, + icmp_dir, &iidx, PF_ICMP_MULTI_NONE); + if (ret >= 0) + return (ret); /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != @@ -6873,21 +7104,23 @@ if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || - nk->port[pd2.sidx] != iih.icmp_id) - pf_change_icmp(pd2.src, &iih.icmp_id, + (virtual_type == htons(ICMP_ECHO) && + nk->port[iidx] != iih.icmp_id)) + pf_change_icmp(pd2.src, + (virtual_type == htons(ICMP_ECHO)) ? + &iih.icmp_id : NULL, daddr, &nk->addr[pd2.sidx], - nk->port[pd2.sidx], NULL, + (virtual_type == htons(ICMP_ECHO)) ? + nk->port[iidx] : 0, NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET); if (PF_ANEQ(pd2.dst, - &nk->addr[pd2.didx], pd2.af) || - nk->port[pd2.didx] != iih.icmp_id) - pf_change_icmp(pd2.dst, &iih.icmp_id, - saddr, &nk->addr[pd2.didx], - nk->port[pd2.didx], NULL, - pd2.ip_sum, icmpsum, - pd->ip_sum, 0, AF_INET); + &nk->addr[pd2.didx], pd2.af)) + pf_change_icmp(pd2.dst, NULL, NULL, + &nk->addr[pd2.didx], 0, NULL, + pd2.ip_sum, icmpsum, pd->ip_sum, 0, + AF_INET); m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp); m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); @@ -6909,13 +7142,25 @@ return (PF_DROP); } - key.af = pd2.af; - key.proto = IPPROTO_ICMPV6; - PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); - PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); - key.port[0] = key.port[1] = iih.icmp6_id; - - STATE_LOOKUP(kif, &key, *state, pd); + pf_icmp_mapping(&pd2, iih.icmp6_type, + &icmp_dir, &multi, &virtual_id, &virtual_type); + ret = pf_icmp_state_lookup(&key, &pd2, state, m, + pd->dir, kif, virtual_id, virtual_type, + icmp_dir, &iidx, PF_ICMP_MULTI_NONE); + if (ret >= 0) { + if (ret == PF_DROP && pd->af == AF_INET6 && + icmp_dir == PF_OUT) { + if (*state != NULL) + PF_STATE_UNLOCK((*state)); + ret = pf_icmp_state_lookup(&key, pd, + state, m, pd->dir, kif, + virtual_id, virtual_type, + icmp_dir, &iidx, multi); + if (ret >= 0) + return (ret); + } else + return (ret); + } /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != @@ -6925,19 +7170,21 @@ if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || - nk->port[pd2.sidx] != iih.icmp6_id) - pf_change_icmp(pd2.src, &iih.icmp6_id, + ((virtual_type == htons(ICMP6_ECHO_REQUEST)) && + nk->port[pd2.sidx] != iih.icmp6_id)) + pf_change_icmp(pd2.src, + (virtual_type == htons(ICMP6_ECHO_REQUEST)) + ? &iih.icmp6_id : NULL, daddr, &nk->addr[pd2.sidx], - nk->port[pd2.sidx], NULL, + (virtual_type == htons(ICMP6_ECHO_REQUEST)) + ? nk->port[iidx] : 0, NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET6); if (PF_ANEQ(pd2.dst, - &nk->addr[pd2.didx], pd2.af) || - nk->port[pd2.didx] != iih.icmp6_id) - pf_change_icmp(pd2.dst, &iih.icmp6_id, - saddr, &nk->addr[pd2.didx], - nk->port[pd2.didx], NULL, + &nk->addr[pd2.didx], pd2.af)) + pf_change_icmp(pd2.dst, NULL, NULL, + &nk->addr[pd2.didx], 0, NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET6); --- sys/netpfil/pf/pf_lb.c.orig +++ sys/netpfil/pf/pf_lb.c @@ -225,6 +225,23 @@ if (pf_map_addr(af, r, saddr, naddr, NULL, &init_addr, sn)) return (1); + if (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 (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 = af; key.proto = proto; @@ -633,7 +650,7 @@ switch (r->action) { case PF_NAT: if (pd->proto == IPPROTO_ICMP) { - low = 1; + low = 1; high = 65535; } else { low = r->rpool.proxy_port[0];