/* $OpenBSD: pf.c,v 1.153 2001/09/17 17:16:27 dhartmei Exp $ */ /* * Copyright (c) 2001 Daniel Hartmeier * 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. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "bpfilter.h" #include "pflog.h" #ifdef INET6 #include #include #include #endif /* INET6 */ #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x /* * Tree data structure */ struct pf_tree_node { struct pf_tree_key key; struct pf_state *state; struct pf_tree_node *parent; struct pf_tree_node *left; struct pf_tree_node *right; int balance; }; struct pf_port_node { LIST_ENTRY(pf_port_node) next; u_int16_t port; }; LIST_HEAD(pf_port_list, pf_port_node); /* structure for ipsec and ipv6 option header template */ struct _opt6 { u_int8_t opt6_nxt; /* next header */ u_int8_t opt6_hlen; /* header extension length */ u_int16_t _pad; u_int32_t ah_spi; /* security parameter index for authentication header */ }; /* * Global variables */ TAILQ_HEAD(pf_natqueue, pf_nat) pf_nats[2]; TAILQ_HEAD(pf_binatqueue, pf_binat) pf_binats[2]; TAILQ_HEAD(pf_rdrqueue, pf_rdr) pf_rdrs[2]; struct pf_rulequeue pf_rules[2]; struct pf_rulequeue *pf_rules_active; struct pf_rulequeue *pf_rules_inactive; struct pf_natqueue *pf_nats_active; struct pf_natqueue *pf_nats_inactive; struct pf_binatqueue *pf_binats_active; struct pf_binatqueue *pf_binats_inactive; struct pf_rdrqueue *pf_rdrs_active; struct pf_rdrqueue *pf_rdrs_inactive; struct pf_tree_node *tree_lan_ext, *tree_ext_gwy; struct timeval pftv; struct pf_status pf_status; struct ifnet *status_ifp; u_int32_t pf_last_purge; u_int32_t ticket_rules_active; u_int32_t ticket_rules_inactive; u_int32_t ticket_nats_active; u_int32_t ticket_nats_inactive; u_int32_t ticket_binats_active; u_int32_t ticket_binats_inactive; u_int32_t ticket_rdrs_active; u_int32_t ticket_rdrs_inactive; struct pf_port_list pf_tcp_ports; struct pf_port_list pf_udp_ports; /* Timeouts */ int pftm_tcp_first_packet = 60; /* First TCP packet */ int pftm_tcp_opening = 30; /* No response yet */ int pftm_tcp_established = 24*60*60; /* established */ int pftm_tcp_closing = 5 * 60; /* Got a FIN */ int pftm_tcp_fin_wait = 2 * 60; /* Got both FINs */ int pftm_tcp_closed = 1 * 60; /* Got a RST */ int pftm_udp_first_packet = 60; /* First UDP packet */ int pftm_udp_single = 30; /* Unidirectional */ int pftm_udp_multiple = 60; /* Bidirectional */ int pftm_icmp_first_packet = 20; /* First ICMP packet */ int pftm_icmp_error_reply = 10; /* Got error response */ int pftm_frag = 30; /* Fragment expire */ int pftm_interval = 10; /* expire interval */ int *pftm_timeouts[PFTM_MAX] = { &pftm_tcp_first_packet, &pftm_tcp_opening, &pftm_tcp_established, &pftm_tcp_closing, &pftm_tcp_fin_wait, &pftm_tcp_closed, &pftm_udp_first_packet, &pftm_udp_single, &pftm_udp_multiple, &pftm_icmp_first_packet, &pftm_icmp_error_reply, &pftm_frag, &pftm_interval }; struct pool pf_tree_pl, pf_rule_pl, pf_nat_pl, pf_sport_pl; struct pool pf_rdr_pl, pf_state_pl, pf_binat_pl; int pf_tree_key_compare(struct pf_tree_key *, struct pf_tree_key *); int pf_compare_addr(struct pf_addr *, struct pf_addr *, u_int8_t); void pf_addrcpy(struct pf_addr *, struct pf_addr *, u_int8_t); int pf_compare_rules(struct pf_rule *, struct pf_rule *); int pf_compare_nats(struct pf_nat *, struct pf_nat *); int pf_compare_binats(struct pf_binat *, struct pf_binat *); int pf_compare_rdrs(struct pf_rdr *, struct pf_rdr *); void pf_tree_rotate_left(struct pf_tree_node **); void pf_tree_rotate_right(struct pf_tree_node **); struct pf_tree_node *pf_tree_first(struct pf_tree_node *); struct pf_tree_node *pf_tree_next(struct pf_tree_node *); struct pf_tree_node *pf_tree_search(struct pf_tree_node *, struct pf_tree_key *); void pf_insert_state(struct pf_state *); void pf_purge_expired_states(void); void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); void pf_print_state(struct pf_state *); void pf_print_flags(u_int8_t); void pfattach(int); int pfopen(dev_t, int, int, struct proc *); int pfclose(dev_t, int, int, struct proc *); int pfioctl(dev_t, u_long, caddr_t, int, struct proc *); u_int16_t pf_cksum_fixup(u_int16_t, u_int16_t, u_int16_t, u_int8_t); void pf_change_ap(struct pf_addr *, u_int16_t *, u_int16_t *, u_int16_t *, struct pf_addr *, u_int16_t, u_int8_t, int); void pf_change_a(u_int32_t *, u_int16_t *, u_int32_t, u_int8_t); #ifdef INET6 void pf_change_a6(struct pf_addr *, u_int16_t *, struct pf_addr *, u_int8_t); #endif /* INET6 */ 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 *, u_int16_t *, u_int8_t, int); void pf_send_reset(int, struct tcphdr *, struct pf_pdesc *, int); void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, int); u_int16_t pf_map_port_range(struct pf_rdr *, u_int16_t); struct pf_nat *pf_get_nat(struct ifnet *, u_int8_t, struct pf_addr *, struct pf_addr *, int); struct pf_binat *pf_get_binat(int, struct ifnet *, u_int8_t, struct pf_addr *, struct pf_addr *, int); struct pf_rdr *pf_get_rdr(struct ifnet *, u_int8_t, struct pf_addr *, struct pf_addr *, u_int16_t, int); int pf_test_tcp(int, struct ifnet *, struct mbuf *, int, int, void *, struct pf_pdesc *); int pf_test_udp(int, struct ifnet *, struct mbuf *, int, int, void *, struct pf_pdesc *); int pf_test_icmp(int, struct ifnet *, struct mbuf *, int, int, void *, struct pf_pdesc *); int pf_test_other(int, struct ifnet *, struct mbuf *, void *, struct pf_pdesc *); int pf_test_state_tcp(struct pf_state **, int, struct ifnet *, struct mbuf *, int, int, void *, struct pf_pdesc *); int pf_test_state_udp(struct pf_state **, int, struct ifnet *, struct mbuf *, int, int, void *, struct pf_pdesc *); int pf_test_state_icmp(struct pf_state **, int, struct ifnet *, struct mbuf *, int, int, void *, struct pf_pdesc *); void *pf_pull_hdr(struct mbuf *, int, void *, int, u_short *, u_short *, int); void pf_calc_skip_steps(struct pf_rulequeue *); int pf_get_sport(u_int8_t, u_int16_t, u_int16_t, u_int16_t *); void pf_put_sport(u_int8_t, u_int16_t); int pf_add_sport(struct pf_port_list *, u_int16_t); int pf_chk_sport(struct pf_port_list *, u_int16_t); int pf_normalize_tcp(int, struct ifnet *, struct mbuf *, int, int, void *, struct pf_pdesc *); #if NPFLOG > 0 #define PFLOG_PACKET(i,x,a,b,c,d,e) \ do { \ if (b == AF_INET) { \ HTONS(((struct ip *)x)->ip_len); \ HTONS(((struct ip *)x)->ip_off); \ pflog_packet(i,a,b,c,d,e); \ NTOHS(((struct ip *)x)->ip_len); \ NTOHS(((struct ip *)x)->ip_off); \ } else { \ pflog_packet(i,a,b,c,d,e); \ } \ } while (0) #else #define PFLOG_PACKET(i,x,a,b,c,d,e) ((void)0) #endif #define STATE_TRANSLATE(s) \ (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \ ((s)->af == AF_INET6 && \ ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \ (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \ (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \ (s)->lan.port != (s)->gwy.port int pf_tree_key_compare(struct pf_tree_key *a, struct pf_tree_key *b) { register int diff; /* * could use memcmp(), but with the best manual order, we can * minimize the number of average compares. what is faster? */ if ((diff = a->proto - b->proto) != 0) return (diff); if ((diff = a->af - b->af) != 0) return (diff); switch (a->af) { #ifdef INET case AF_INET: if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) return 1; if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) return -1; if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) return 1; if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) return -1; break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (a->addr[0].addr32[0] > b->addr[0].addr32[0]) return 1; if (a->addr[0].addr32[0] < b->addr[0].addr32[0]) return -1; if (a->addr[0].addr32[1] > b->addr[0].addr32[1]) return 1; if (a->addr[0].addr32[1] < b->addr[0].addr32[1]) return -1; if (a->addr[0].addr32[2] > b->addr[0].addr32[2]) return 1; if (a->addr[0].addr32[2] < b->addr[0].addr32[2]) return -1; if (a->addr[0].addr32[3] > b->addr[0].addr32[3]) return 1; if (a->addr[0].addr32[3] < b->addr[0].addr32[3]) return -1; if (a->addr[1].addr32[0] > b->addr[1].addr32[0]) return 1; if (a->addr[1].addr32[0] < b->addr[1].addr32[0]) return -1; if (a->addr[1].addr32[1] > b->addr[1].addr32[1]) return 1; if (a->addr[1].addr32[1] < b->addr[1].addr32[1]) return -1; if (a->addr[1].addr32[2] > b->addr[1].addr32[2]) return 1; if (a->addr[1].addr32[2] < b->addr[1].addr32[2]) return -1; if (a->addr[1].addr32[3] > b->addr[1].addr32[3]) return 1; if (a->addr[1].addr32[3] < b->addr[1].addr32[3]) return -1; break; #endif /* INET6 */ } if ((diff = a->port[0] - b->port[0]) != 0) return (diff); if ((diff = a->port[1] - b->port[1]) != 0) return (diff); return (0); } #ifdef INET6 void pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, u_int8_t af) { switch(af) { #ifdef INET case AF_INET: dst->addr32[0] = src->addr32[0]; break; #endif /* INET */ case AF_INET6: dst->addr32[0] = src->addr32[0]; dst->addr32[1] = src->addr32[1]; dst->addr32[2] = src->addr32[2]; dst->addr32[3] = src->addr32[3]; break; } } #endif int pf_compare_rules(struct pf_rule *a, struct pf_rule *b) { if (a->return_icmp != b->return_icmp || a->action != b->action || a->direction != b->direction || a->log != b->log || a->quick != b->quick || a->keep_state != b->keep_state || a->af != b->af || a->proto != b->proto || a->type != b->type || a->code != b->code || a->flags != b->flags || a->flagset != b->flagset || a->rule_flag != b->rule_flag || a->min_ttl != b->min_ttl) return (1); if (memcmp(&a->src, &b->src, sizeof(struct pf_rule_addr))) return (1); if (memcmp(&a->dst, &b->dst, sizeof(struct pf_rule_addr))) return (1); if (strcmp(a->ifname, b->ifname)) return (1); return (0); } int pf_compare_nats(struct pf_nat *a, struct pf_nat *b) { if (a->proto != b->proto || a->af != b->af || a->snot != b->snot || a->dnot != b->dnot || a->ifnot != b->ifnot) return (1); if (PF_ANEQ(&a->saddr, &b->saddr, a->af)) return (1); if (PF_ANEQ(&a->smask, &b->smask, a->af)) return (1); if (PF_ANEQ(&a->daddr, &b->daddr, a->af)) return (1); if (PF_ANEQ(&a->dmask, &b->dmask, a->af)) return (1); if (PF_ANEQ(&a->raddr, &b->raddr, a->af)) return (1); if (strcmp(a->ifname, b->ifname)) return (1); return (0); } int pf_compare_binats(struct pf_binat *a, struct pf_binat *b) { if (PF_ANEQ(&a->saddr, &b->saddr, a->af)) return (1); if (PF_ANEQ(&a->daddr, &b->daddr, a->af)) return (1); if (PF_ANEQ(&a->dmask, &b->dmask, a->af)) return (1); if (PF_ANEQ(&a->raddr, &b->raddr, a->af)) return (1); if (a->proto != b->proto || a->dnot != b->dnot || a->af != b->af) return (1); if (strcmp(a->ifname, b->ifname)) return (1); return (0); } int pf_compare_rdrs(struct pf_rdr *a, struct pf_rdr *b) { if (a->dport != b->dport || a->dport2 != b->dport2 || a->rport != b->rport || a->proto != b->proto || a->af != b->af || a->snot != b->snot || a->dnot != b->dnot || a->ifnot != b->ifnot || a->opts != b->opts) return (1); if (PF_ANEQ(&a->saddr, &b->saddr, a->af)) return (1); if (PF_ANEQ(&a->smask, &b->smask, a->af)) return (1); if (PF_ANEQ(&a->daddr, &b->daddr, a->af)) return (1); if (PF_ANEQ(&a->dmask, &b->dmask, a->af)) return (1); if (PF_ANEQ(&a->raddr, &b->raddr, a->af)) return (1); if (strcmp(a->ifname, b->ifname)) return (1); return (0); } void pf_tree_rotate_left(struct pf_tree_node **n) { struct pf_tree_node *q = *n, *p = (*n)->parent; (*n)->parent = (*n)->right; *n = (*n)->right; (*n)->parent = p; q->right = (*n)->left; if (q->right) q->right->parent = q; (*n)->left = q; q->balance--; if ((*n)->balance > 0) q->balance -= (*n)->balance; (*n)->balance--; if (q->balance < 0) (*n)->balance += q->balance; } void pf_tree_rotate_right(struct pf_tree_node **n) { struct pf_tree_node *q = *n, *p = (*n)->parent; (*n)->parent = (*n)->left; *n = (*n)->left; (*n)->parent = p; q->left = (*n)->right; if (q->left) q->left->parent = q; (*n)->right = q; q->balance++; if ((*n)->balance < 0) q->balance -= (*n)->balance; (*n)->balance++; if (q->balance > 0) (*n)->balance += q->balance; } int pf_tree_insert(struct pf_tree_node **n, struct pf_tree_node *p, struct pf_tree_key *key, struct pf_state *state) { int deltaH = 0; if (*n == NULL) { *n = pool_get(&pf_tree_pl, PR_NOWAIT); if (*n == NULL) return (0); bcopy(key, &(*n)->key, sizeof(struct pf_tree_key)); (*n)->state = state; (*n)->balance = 0; (*n)->parent = p; (*n)->left = (*n)->right = NULL; deltaH = 1; } else if (pf_tree_key_compare(key, &(*n)->key) > 0) { if (pf_tree_insert(&(*n)->right, *n, key, state)) { (*n)->balance++; if ((*n)->balance == 1) deltaH = 1; else if ((*n)->balance == 2) { if ((*n)->right->balance == -1) pf_tree_rotate_right(&(*n)->right); pf_tree_rotate_left(n); } } } else { if (pf_tree_insert(&(*n)->left, *n, key, state)) { (*n)->balance--; if ((*n)->balance == -1) deltaH = 1; else if ((*n)->balance == -2) { if ((*n)->left->balance == 1) pf_tree_rotate_left(&(*n)->left); pf_tree_rotate_right(n); } } } return (deltaH); } int pf_tree_remove(struct pf_tree_node **n, struct pf_tree_node *p, struct pf_tree_key *key) { int deltaH = 0; int c; if (*n == NULL) return (0); c = pf_tree_key_compare(key, &(*n)->key); if (c < 0) { if (pf_tree_remove(&(*n)->left, *n, key)) { (*n)->balance++; if ((*n)->balance == 0) deltaH = 1; else if ((*n)->balance == 2) { if ((*n)->right->balance == -1) pf_tree_rotate_right(&(*n)->right); pf_tree_rotate_left(n); if ((*n)->balance == 0) deltaH = 1; } } } else if (c > 0) { if (pf_tree_remove(&(*n)->right, *n, key)) { (*n)->balance--; if ((*n)->balance == 0) deltaH = 1; else if ((*n)->balance == -2) { if ((*n)->left->balance == 1) pf_tree_rotate_left(&(*n)->left); pf_tree_rotate_right(n); if ((*n)->balance == 0) deltaH = 1; } } } else { if ((*n)->right == NULL) { struct pf_tree_node *n0 = *n; *n = (*n)->left; if (*n != NULL) (*n)->parent = p; pool_put(&pf_tree_pl, n0); deltaH = 1; } else if ((*n)->left == NULL) { struct pf_tree_node *n0 = *n; *n = (*n)->right; if (*n != NULL) (*n)->parent = p; pool_put(&pf_tree_pl, n0); deltaH = 1; } else { struct pf_tree_node **qq = &(*n)->left; while ((*qq)->right != NULL) qq = &(*qq)->right; bcopy(&(*qq)->key, &(*n)->key, sizeof(struct pf_tree_key)); (*n)->state = (*qq)->state; bcopy(key, &(*qq)->key, sizeof(struct pf_tree_key)); if (pf_tree_remove(&(*n)->left, *n, key)) { (*n)->balance++; if ((*n)->balance == 0) deltaH = 1; else if ((*n)->balance == 2) { if ((*n)->right->balance == -1) pf_tree_rotate_right( &(*n)->right); pf_tree_rotate_left(n); if ((*n)->balance == 0) deltaH = 1; } } } } return (deltaH); } int pflog_packet(struct ifnet *ifp, struct mbuf *m, int af, u_short dir, u_short reason, struct pf_rule *rm) { #if NBPFILTER > 0 struct ifnet *ifn; struct pfloghdr hdr; struct mbuf m1; if (ifp == NULL || m == NULL || rm == NULL) return (-1); hdr.af = htonl(af); memcpy(hdr.ifname, ifp->if_xname, sizeof(hdr.ifname)); hdr.rnr = htons(rm->nr); hdr.reason = htons(reason); hdr.dir = htons(dir); hdr.action = htons(rm->action); m1.m_next = m; m1.m_len = PFLOG_HDRLEN; m1.m_data = (char *) &hdr; ifn = &(pflogif[0].sc_if); if (ifn->if_bpf) bpf_mtap(ifn->if_bpf, &m1); #endif return (0); } struct pf_tree_node * pf_tree_first(struct pf_tree_node *n) { if (n == NULL) return (NULL); while (n->parent) n = n->parent; while (n->left) n = n->left; return (n); } struct pf_tree_node * pf_tree_next(struct pf_tree_node *n) { if (n == NULL) return (NULL); if (n->right) { n = n->right; while (n->left) n = n->left; } else { if (n->parent && (n == n->parent->left)) n = n->parent; else { while (n->parent && (n == n->parent->right)) n = n->parent; n = n->parent; } } return (n); } struct pf_tree_node * pf_tree_search(struct pf_tree_node *n, struct pf_tree_key *key) { int c; while (n && (c = pf_tree_key_compare(&n->key, key))) if (c > 0) n = n->left; else n = n->right; pf_status.fcounters[FCNT_STATE_SEARCH]++; return (n); } struct pf_state * pf_find_state(struct pf_tree_node *n, struct pf_tree_key *key) { n = pf_tree_search(n, key); if (n) return (n->state); else return (NULL); } void pf_insert_state(struct pf_state *state) { struct pf_tree_key key; struct pf_state *s; key.af = state->af; key.proto = state->proto; PF_ACPY(&key.addr[0], &state->lan.addr, state->af); key.port[0] = state->lan.port; PF_ACPY(&key.addr[1], &state->ext.addr, state->af); key.port[1] = state->ext.port; /* sanity checks can be removed later, should never occur */ if ((s = pf_find_state(tree_lan_ext, &key)) != NULL) { if (pf_status.debug >= PF_DEBUG_URGENT) { printf("pf: ERROR! insert invalid\n"); printf(" key already in tree_lan_ext\n"); printf(" key: proto = %u, lan = ", state->proto); pf_print_host(&key.addr[0], key.port[0], key.af); printf(", ext = "); pf_print_host(&key.addr[1], key.port[1], key.af); printf("\n state: "); pf_print_state(s); printf("\n"); } } else { pf_tree_insert(&tree_lan_ext, NULL, &key, state); if (pf_find_state(tree_lan_ext, &key) != state) DPFPRINTF(PF_DEBUG_URGENT, ("pf: ERROR! insert failed\n")); } key.af = state->af; key.proto = state->proto; PF_ACPY(&key.addr[0], &state->ext.addr, state->af); key.port[0] = state->ext.port; PF_ACPY(&key.addr[1], &state->gwy.addr, state->af); key.port[1] = state->gwy.port; if ((s = pf_find_state(tree_ext_gwy, &key)) != NULL) { if (pf_status.debug >= PF_DEBUG_URGENT) { printf("pf: ERROR! insert invalid\n"); printf(" key already in tree_ext_gwy\n"); printf(" key: proto = %u, ext = ", state->proto); pf_print_host(&key.addr[0], key.port[0], key.af); printf(", gwy = "); pf_print_host(&key.addr[1], key.port[1], key.af); printf("\n state: "); pf_print_state(s); printf("\n"); } } else { pf_tree_insert(&tree_ext_gwy, NULL, &key, state); if (pf_find_state(tree_ext_gwy, &key) != state) DPFPRINTF(PF_DEBUG_URGENT, ("pf: ERROR! insert failed\n")); } pf_status.fcounters[FCNT_STATE_INSERT]++; pf_status.states++; } void pf_purge_expired_states(void) { struct pf_tree_node *cur, *next; struct pf_tree_key key; cur = pf_tree_first(tree_ext_gwy); while (cur != NULL) { if (cur->state->expire <= pftv.tv_sec) { key.af = cur->state->af; key.proto = cur->state->proto; PF_ACPY(&key.addr[0], &cur->state->lan.addr, cur->state->af); key.port[0] = cur->state->lan.port; PF_ACPY(&key.addr[1], &cur->state->ext.addr, cur->state->af); key.port[1] = cur->state->ext.port; /* remove state from second tree */ if (pf_find_state(tree_lan_ext, &key) != cur->state) DPFPRINTF(PF_DEBUG_URGENT, ("pf: ERROR: remove invalid!\n")); pf_tree_remove(&tree_lan_ext, NULL, &key); if (pf_find_state(tree_lan_ext, &key) != NULL) DPFPRINTF(PF_DEBUG_URGENT, ("pf: ERROR: remove failed\n")); if (STATE_TRANSLATE(cur->state)) pf_put_sport(cur->state->proto, htons(cur->state->gwy.port)); /* free state */ pool_put(&pf_state_pl, cur->state); /* * remove state from tree being traversed, use next * state's key to search after removal, since removal * can invalidate pointers. */ next = pf_tree_next(cur); if (next) { key = next->key; pf_tree_remove(&tree_ext_gwy, NULL, &cur->key); cur = pf_tree_search(tree_ext_gwy, &key); if (cur == NULL) DPFPRINTF(PF_DEBUG_URGENT, ("pf: ERROR: next not found\n")); } else { pf_tree_remove(&tree_ext_gwy, NULL, &cur->key); cur = NULL; } pf_status.fcounters[FCNT_STATE_REMOVALS]++; pf_status.states--; } else cur = pf_tree_next(cur); } } void pf_print_host(struct pf_addr *addr, u_int16_t p, u_int8_t af) { switch(af) { #ifdef INET case AF_INET: { u_int32_t a = ntohl(addr->addr32[0]); p = ntohs(p); printf("%u.%u.%u.%u:%u", (a>>24)&255, (a>>16)&255, (a>>8)&255, a&255, p); break; } #endif /* INET */ #ifdef INET6 case AF_INET6: { u_int16_t b; u_int8_t i, curstart = 255, curend = 0, maxstart = 0, maxend = 0; for (i = 0; i < 8; i++) { if (!addr->addr16[i]) { if (curstart == 255) curstart = i; else curend = i; } else { if (curstart) { if ((curend - curstart) > (maxend - maxstart)) { maxstart = curstart; maxend = curend; curstart = 255; } } } } for (i = 0; i < 8; i++) { if (i >= maxstart && i <= maxend) { if (maxend != 7) { if (i == maxstart) printf(":"); } else { if (i == maxend) printf(":"); } } else { b = ntohs(addr->addr16[i]); printf("%x", b); if (i < 7) printf(":"); } } p = ntohs(p); printf("[%u]", p); break; } #endif /* INET6 */ } } void pf_print_state(struct pf_state *s) { switch (s->proto) { case IPPROTO_TCP: printf("TCP "); break; case IPPROTO_UDP: printf("UDP "); break; case IPPROTO_ICMP: printf("ICMP "); break; default: printf("%u ", s->proto); break; } pf_print_host(&s->lan.addr, s->lan.port, s->af); printf(" "); pf_print_host(&s->gwy.addr, s->gwy.port, s->af); printf(" "); pf_print_host(&s->ext.addr, s->ext.port, s->af); printf(" [lo=%lu high=%lu win=%u modulator=%u]", s->src.seqlo, s->src.seqhi, s->src.max_win, s->src.seqdiff); printf(" [lo=%lu high=%lu win=%u modulator=%u]", s->dst.seqlo, s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); printf(" %u:%u", s->src.state, s->dst.state); } void pf_print_flags(u_int8_t f) { if (f) printf(" "); if (f & TH_FIN) printf("F"); if (f & TH_SYN) printf("S"); if (f & TH_RST) printf("R"); if (f & TH_PUSH) printf("P"); if (f & TH_ACK) printf("A"); if (f & TH_URG) printf("U"); } void pfattach(int num) { /* XXX - no M_* tags, but they are not used anyway */ pool_init(&pf_tree_pl, sizeof(struct pf_tree_node), 0, 0, 0, "pftrpl", 0, NULL, NULL, 0); pool_init(&pf_rule_pl, sizeof(struct pf_rule), 0, 0, 0, "pfrulepl", 0, NULL, NULL, 0); pool_init(&pf_nat_pl, sizeof(struct pf_nat), 0, 0, 0, "pfnatpl", 0, NULL, NULL, 0); pool_init(&pf_binat_pl, sizeof(struct pf_binat), 0, 0, 0, "pfbinatpl", 0, NULL, NULL, 0); pool_init(&pf_rdr_pl, sizeof(struct pf_rdr), 0, 0, 0, "pfrdrpl", 0, NULL, NULL, 0); pool_init(&pf_state_pl, sizeof(struct pf_state), 0, 0, 0, "pfstatepl", 0, NULL, NULL, 0); pool_init(&pf_sport_pl, sizeof(struct pf_port_node), 0, 0, 0, "pfsport", 0, NULL, NULL, 0); TAILQ_INIT(&pf_rules[0]); TAILQ_INIT(&pf_rules[1]); TAILQ_INIT(&pf_nats[0]); TAILQ_INIT(&pf_nats[1]); TAILQ_INIT(&pf_binats[0]); TAILQ_INIT(&pf_binats[1]); TAILQ_INIT(&pf_rdrs[0]); TAILQ_INIT(&pf_rdrs[1]); pf_rules_active = &pf_rules[0]; pf_rules_inactive = &pf_rules[1]; pf_nats_active = &pf_nats[0]; pf_nats_inactive = &pf_nats[1]; pf_binats_active = &pf_binats[0]; pf_binats_inactive = &pf_binats[1]; pf_rdrs_active = &pf_rdrs[0]; pf_rdrs_inactive = &pf_rdrs[1]; LIST_INIT(&pf_tcp_ports); LIST_INIT(&pf_udp_ports); pf_normalize_init(); } int pfopen(dev_t dev, int flags, int fmt, struct proc *p) { if (minor(dev) >= 1) return (ENXIO); return (0); } int pfclose(dev_t dev, int flags, int fmt, struct proc *p) { if (minor(dev) >= 1) return (ENXIO); return (0); } int pfioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p) { int error = 0; int s; if (!(flags & FWRITE)) return (EACCES); if (securelevel > 1) switch (cmd) { case DIOCSTART: case DIOCSTOP: case DIOCBEGINRULES: case DIOCADDRULE: case DIOCCOMMITRULES: case DIOCBEGINNATS: case DIOCADDNAT: case DIOCCOMMITNATS: case DIOCBEGINBINATS: case DIOCADDBINAT: case DIOCCOMMITBINATS: case DIOCBEGINRDRS: case DIOCADDRDR: case DIOCCOMMITRDRS: case DIOCCLRSTATES: case DIOCCHANGERULE: case DIOCCHANGENAT: case DIOCCHANGERDR: case DIOCSETTIMEOUT: return EPERM; } switch (cmd) { case DIOCSTART: if (pf_status.running) error = EEXIST; else { u_int32_t states = pf_status.states; bzero(&pf_status, sizeof(struct pf_status)); pf_status.running = 1; pf_status.states = states; microtime(&pftv); pf_status.since = pftv.tv_sec; DPFPRINTF(PF_DEBUG_MISC, ("pf: started\n")); } break; case DIOCSTOP: if (!pf_status.running) error = ENOENT; else { pf_status.running = 0; DPFPRINTF(PF_DEBUG_MISC, ("pf: stopped\n")); } break; case DIOCBEGINRULES: { u_int32_t *ticket = (u_int32_t *)addr; struct pf_rule *rule; while ((rule = TAILQ_FIRST(pf_rules_inactive)) != NULL) { TAILQ_REMOVE(pf_rules_inactive, rule, entries); pool_put(&pf_rule_pl, rule); } *ticket = ++ticket_rules_inactive; break; } case DIOCADDRULE: { struct pfioc_rule *pr = (struct pfioc_rule *)addr; struct pf_rule *rule, *tail; if (pr->ticket != ticket_rules_inactive) { error = EBUSY; break; } rule = pool_get(&pf_rule_pl, PR_NOWAIT); if (rule == NULL) { error = ENOMEM; break; } bcopy(&pr->rule, rule, sizeof(struct pf_rule)); #ifndef INET if (rule->af == AF_INET) { error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (rule->af == AF_INET6) { error = EAFNOSUPPORT; break; } #endif /* INET6 */ tail = TAILQ_LAST(pf_rules_inactive, pf_rulequeue); if (tail) rule->nr = tail->nr + 1; else rule->nr = 0; rule->ifp = NULL; if (rule->ifname[0]) { rule->ifp = ifunit(rule->ifname); if (rule->ifp == NULL) { pool_put(&pf_rule_pl, rule); error = EINVAL; break; } } else rule->ifp = NULL; rule->evaluations = rule->packets = rule->bytes = 0; TAILQ_INSERT_TAIL(pf_rules_inactive, rule, entries); break; } case DIOCCOMMITRULES: { u_int32_t *ticket = (u_int32_t *)addr; struct pf_rulequeue *old_rules; struct pf_rule *rule; struct pf_tree_node *n; if (*ticket != ticket_rules_inactive) { error = EBUSY; break; } /* Swap rules, keep the old. */ s = splsoftnet(); /* * Rules are about to get freed, clear rule pointers in states */ for (n = pf_tree_first(tree_ext_gwy); n != NULL; n = pf_tree_next(n)) n->state->rule = NULL; old_rules = pf_rules_active; pf_rules_active = pf_rules_inactive; pf_rules_inactive = old_rules; ticket_rules_active = ticket_rules_inactive; pf_calc_skip_steps(pf_rules_active); splx(s); /* Purge the old rule list. */ while ((rule = TAILQ_FIRST(old_rules)) != NULL) { TAILQ_REMOVE(old_rules, rule, entries); pool_put(&pf_rule_pl, rule); } break; } case DIOCGETRULES: { struct pfioc_rule *pr = (struct pfioc_rule *)addr; struct pf_rule *tail; s = splsoftnet(); tail = TAILQ_LAST(pf_rules_active, pf_rulequeue); if (tail) pr->nr = tail->nr + 1; else pr->nr = 0; pr->ticket = ticket_rules_active; splx(s); break; } case DIOCGETRULE: { struct pfioc_rule *pr = (struct pfioc_rule *)addr; struct pf_rule *rule; if (pr->ticket != ticket_rules_active) { error = EBUSY; break; } s = splsoftnet(); rule = TAILQ_FIRST(pf_rules_active); while ((rule != NULL) && (rule->nr != pr->nr)) rule = TAILQ_NEXT(rule, entries); if (rule == NULL) { error = EBUSY; splx(s); break; } bcopy(rule, &pr->rule, sizeof(struct pf_rule)); splx(s); break; } case DIOCCHANGERULE: { struct pfioc_changerule *pcr = (struct pfioc_changerule *)addr; struct pf_rule *oldrule = NULL, *newrule = NULL; u_int32_t nr = 0; if (pcr->action < PF_CHANGE_ADD_HEAD || pcr->action > PF_CHANGE_REMOVE) { error = EINVAL; break; } if (pcr->action != PF_CHANGE_REMOVE) { newrule = pool_get(&pf_rule_pl, PR_NOWAIT); if (newrule == NULL) { error = ENOMEM; break; } bcopy(&pcr->newrule, newrule, sizeof(struct pf_rule)); #ifndef INET if (newrule->af == AF_INET) { error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (newrule->af == AF_INET6) { error = EAFNOSUPPORT; break; } #endif /* INET6 */ newrule->ifp = NULL; if (newrule->ifname[0]) { newrule->ifp = ifunit(newrule->ifname); if (newrule->ifp == NULL) { pool_put(&pf_rule_pl, newrule); error = EINVAL; break; } } newrule->evaluations = newrule->packets = 0; newrule->bytes = 0; } s = splsoftnet(); if (pcr->action == PF_CHANGE_ADD_HEAD) oldrule = TAILQ_FIRST(pf_rules_active); else if (pcr->action == PF_CHANGE_ADD_TAIL) oldrule = TAILQ_LAST(pf_rules_active, pf_rulequeue); else { oldrule = TAILQ_FIRST(pf_rules_active); while ((oldrule != NULL) && pf_compare_rules(oldrule, &pcr->oldrule)) oldrule = TAILQ_NEXT(oldrule, entries); if (oldrule == NULL) { error = EINVAL; splx(s); break; } } if (pcr->action == PF_CHANGE_REMOVE) { struct pf_tree_node *n; for (n = pf_tree_first(tree_ext_gwy); n != NULL; n = pf_tree_next(n)) if (n->state->rule == oldrule) n->state->rule = NULL; TAILQ_REMOVE(pf_rules_active, oldrule, entries); pool_put(&pf_rule_pl, oldrule); } else { if (oldrule == NULL) TAILQ_INSERT_TAIL(pf_rules_active, newrule, entries); else if (pcr->action == PF_CHANGE_ADD_HEAD || pcr->action == PF_CHANGE_ADD_BEFORE) TAILQ_INSERT_BEFORE(oldrule, newrule, entries); else TAILQ_INSERT_AFTER(pf_rules_active, oldrule, newrule, entries); } TAILQ_FOREACH(oldrule, pf_rules_active, entries) oldrule->nr = nr++; pf_calc_skip_steps(pf_rules_active); ticket_rules_active++; splx(s); break; } case DIOCBEGINNATS: { u_int32_t *ticket = (u_int32_t *)addr; struct pf_nat *nat; while ((nat = TAILQ_FIRST(pf_nats_inactive)) != NULL) { TAILQ_REMOVE(pf_nats_inactive, nat, entries); pool_put(&pf_nat_pl, nat); } *ticket = ++ticket_nats_inactive; break; } case DIOCADDNAT: { struct pfioc_nat *pn = (struct pfioc_nat *)addr; struct pf_nat *nat; if (pn->ticket != ticket_nats_inactive) { error = EBUSY; break; } nat = pool_get(&pf_nat_pl, PR_NOWAIT); if (nat == NULL) { error = ENOMEM; break; } bcopy(&pn->nat, nat, sizeof(struct pf_nat)); #ifndef INET if (nat->af == AF_INET) { error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (nat->af == AF_INET6) { error = EAFNOSUPPORT; break; } #endif /* INET6 */ if (nat->ifname[0]) { nat->ifp = ifunit(nat->ifname); if (nat->ifp == NULL) { pool_put(&pf_nat_pl, nat); error = EINVAL; break; } } else nat->ifp = NULL; TAILQ_INSERT_TAIL(pf_nats_inactive, nat, entries); break; } case DIOCCOMMITNATS: { u_int32_t *ticket = (u_int32_t *)addr; struct pf_natqueue *old_nats; struct pf_nat *nat; if (*ticket != ticket_nats_inactive) { error = EBUSY; break; } /* Swap nats, keep the old. */ s = splsoftnet(); old_nats = pf_nats_active; pf_nats_active = pf_nats_inactive; pf_nats_inactive = old_nats; ticket_nats_active = ticket_nats_inactive; splx(s); /* Purge the old nat list */ while ((nat = TAILQ_FIRST(old_nats)) != NULL) { TAILQ_REMOVE(old_nats, nat, entries); pool_put(&pf_nat_pl, nat); } break; } case DIOCGETNATS: { struct pfioc_nat *pn = (struct pfioc_nat *)addr; struct pf_nat *nat; pn->nr = 0; s = splsoftnet(); TAILQ_FOREACH(nat, pf_nats_active, entries) pn->nr++; pn->ticket = ticket_nats_active; splx(s); break; } case DIOCGETNAT: { struct pfioc_nat *pn = (struct pfioc_nat *)addr; struct pf_nat *nat; u_int32_t nr; if (pn->ticket != ticket_nats_active) { error = EBUSY; break; } nr = 0; s = splsoftnet(); nat = TAILQ_FIRST(pf_nats_active); while ((nat != NULL) && (nr < pn->nr)) { nat = TAILQ_NEXT(nat, entries); nr++; } if (nat == NULL) { error = EBUSY; splx(s); break; } bcopy(nat, &pn->nat, sizeof(struct pf_nat)); splx(s); break; } case DIOCCHANGENAT: { struct pfioc_changenat *pcn = (struct pfioc_changenat *)addr; struct pf_nat *oldnat = NULL, *newnat = NULL; if (pcn->action < PF_CHANGE_ADD_HEAD || pcn->action > PF_CHANGE_REMOVE) { error = EINVAL; break; } if (pcn->action != PF_CHANGE_REMOVE) { newnat = pool_get(&pf_nat_pl, PR_NOWAIT); if (newnat == NULL) { error = ENOMEM; break; } bcopy(&pcn->newnat, newnat, sizeof(struct pf_nat)); #ifndef INET if (newnat->af == AF_INET) { error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (newnat->af == AF_INET6) { error = EAFNOSUPPORT; break; } #endif /* INET6 */ newnat->ifp = NULL; if (newnat->ifname[0]) { newnat->ifp = ifunit(newnat->ifname); if (newnat->ifp == NULL) { pool_put(&pf_nat_pl, newnat); error = EINVAL; break; } } } s = splsoftnet(); if (pcn->action == PF_CHANGE_ADD_HEAD) oldnat = TAILQ_FIRST(pf_nats_active); else if (pcn->action == PF_CHANGE_ADD_TAIL) oldnat = TAILQ_LAST(pf_nats_active, pf_natqueue); else { oldnat = TAILQ_FIRST(pf_nats_active); while ((oldnat != NULL) && pf_compare_nats(oldnat, &pcn->oldnat)) oldnat = TAILQ_NEXT(oldnat, entries); if (oldnat == NULL) { error = EINVAL; splx(s); break; } } if (pcn->action == PF_CHANGE_REMOVE) { TAILQ_REMOVE(pf_nats_active, oldnat, entries); pool_put(&pf_nat_pl, oldnat); } else { if (oldnat == NULL) TAILQ_INSERT_TAIL(pf_nats_active, newnat, entries); else if (pcn->action == PF_CHANGE_ADD_HEAD || pcn->action == PF_CHANGE_ADD_BEFORE) TAILQ_INSERT_BEFORE(oldnat, newnat, entries); else TAILQ_INSERT_AFTER(pf_nats_active, oldnat, newnat, entries); } ticket_nats_active++; splx(s); break; } case DIOCBEGINBINATS: { u_int32_t *ticket = (u_int32_t *)addr; struct pf_binat *binat; while ((binat = TAILQ_FIRST(pf_binats_inactive)) != NULL) { TAILQ_REMOVE(pf_binats_inactive, binat, entries); pool_put(&pf_binat_pl, binat); } *ticket = ++ticket_binats_inactive; break; } case DIOCADDBINAT: { struct pfioc_binat *pb = (struct pfioc_binat *)addr; struct pf_binat *binat; if (pb->ticket != ticket_binats_inactive) { error = EBUSY; break; } binat = pool_get(&pf_binat_pl, PR_NOWAIT); if (binat == NULL) { error = ENOMEM; break; } bcopy(&pb->binat, binat, sizeof(struct pf_binat)); #ifndef INET if (binat->af == AF_INET) { error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (binat->af == AF_INET6) { error = EAFNOSUPPORT; break; } #endif /* INET6 */ if (binat->ifname[0]) { binat->ifp = ifunit(binat->ifname); if (binat->ifp == NULL) { pool_put(&pf_binat_pl, binat); error = EINVAL; break; } } else binat->ifp = NULL; TAILQ_INSERT_TAIL(pf_binats_inactive, binat, entries); break; } case DIOCCOMMITBINATS: { u_int32_t *ticket = (u_int32_t *)addr; struct pf_binatqueue *old_binats; struct pf_binat *binat; if (*ticket != ticket_binats_inactive) { error = EBUSY; break; } /* Swap binats, keep the old. */ s = splsoftnet(); old_binats = pf_binats_active; pf_binats_active = pf_binats_inactive; pf_binats_inactive = old_binats; ticket_binats_active = ticket_binats_inactive; splx(s); /* Purge the old binat list */ while ((binat = TAILQ_FIRST(old_binats)) != NULL) { TAILQ_REMOVE(old_binats, binat, entries); pool_put(&pf_binat_pl, binat); } break; } case DIOCGETBINATS: { struct pfioc_binat *pb = (struct pfioc_binat *)addr; struct pf_binat *binat; pb->nr = 0; s = splsoftnet(); TAILQ_FOREACH(binat, pf_binats_active, entries) pb->nr++; pb->ticket = ticket_binats_active; splx(s); break; } case DIOCGETBINAT: { struct pfioc_binat *pb = (struct pfioc_binat *)addr; struct pf_binat *binat; u_int32_t nr; if (pb->ticket != ticket_binats_active) { error = EBUSY; break; } nr = 0; s = splsoftnet(); binat = TAILQ_FIRST(pf_binats_active); while ((binat != NULL) && (nr < pb->nr)) { binat = TAILQ_NEXT(binat, entries); nr++; } if (binat == NULL) { error = EBUSY; splx(s); break; } bcopy(binat, &pb->binat, sizeof(struct pf_binat)); splx(s); break; } case DIOCCHANGEBINAT: { struct pfioc_changebinat *pcn = (struct pfioc_changebinat *)addr; struct pf_binat *oldbinat = NULL, *newbinat = NULL; if (pcn->action < PF_CHANGE_ADD_HEAD || pcn->action > PF_CHANGE_REMOVE) { error = EINVAL; break; } if (pcn->action != PF_CHANGE_REMOVE) { newbinat = pool_get(&pf_binat_pl, PR_NOWAIT); if (newbinat == NULL) { error = ENOMEM; break; } bcopy(&pcn->newbinat, newbinat, sizeof(struct pf_binat)); #ifndef INET if (newbinat->af == AF_INET) { error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (newbinat->af == AF_INET6) { error = EAFNOSUPPORT; break; } #endif /* INET6 */ newbinat->ifp = NULL; if (newbinat->ifname[0]) { newbinat->ifp = ifunit(newbinat->ifname); if (newbinat->ifp == NULL) { pool_put(&pf_binat_pl, newbinat); error = EINVAL; break; } } } s = splsoftnet(); if (pcn->action == PF_CHANGE_ADD_HEAD) oldbinat = TAILQ_FIRST(pf_binats_active); else if (pcn->action == PF_CHANGE_ADD_TAIL) oldbinat = TAILQ_LAST(pf_binats_active, pf_binatqueue); else { oldbinat = TAILQ_FIRST(pf_binats_active); while ((oldbinat != NULL) && pf_compare_binats(oldbinat, &pcn->oldbinat)) oldbinat = TAILQ_NEXT(oldbinat, entries); if (oldbinat == NULL) { error = EINVAL; splx(s); break; } } if (pcn->action == PF_CHANGE_REMOVE) { TAILQ_REMOVE(pf_binats_active, oldbinat, entries); pool_put(&pf_binat_pl, oldbinat); } else { if (oldbinat == NULL) TAILQ_INSERT_TAIL(pf_binats_active, newbinat, entries); else if (pcn->action == PF_CHANGE_ADD_HEAD || pcn->action == PF_CHANGE_ADD_BEFORE) TAILQ_INSERT_BEFORE(oldbinat, newbinat, entries); else TAILQ_INSERT_AFTER(pf_binats_active, oldbinat, newbinat, entries); } ticket_binats_active++; splx(s); break; } case DIOCBEGINRDRS: { u_int32_t *ticket = (u_int32_t *)addr; struct pf_rdr *rdr; while ((rdr = TAILQ_FIRST(pf_rdrs_inactive)) != NULL) { TAILQ_REMOVE(pf_rdrs_inactive, rdr, entries); pool_put(&pf_rdr_pl, rdr); } *ticket = ++ticket_rdrs_inactive; break; } case DIOCADDRDR: { struct pfioc_rdr *pr = (struct pfioc_rdr *)addr; struct pf_rdr *rdr; if (pr->ticket != ticket_rdrs_inactive) { error = EBUSY; break; } rdr = pool_get(&pf_rdr_pl, PR_NOWAIT); if (rdr == NULL) { error = ENOMEM; break; } bcopy(&pr->rdr, rdr, sizeof(struct pf_rdr)); #ifndef INET if (rdr->af == AF_INET) { error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (rdr->af == AF_INET6) { error = EAFNOSUPPORT; break; } #endif /* INET6 */ if (rdr->ifname[0]) { rdr->ifp = ifunit(rdr->ifname); if (rdr->ifp == NULL) { pool_put(&pf_rdr_pl, rdr); error = EINVAL; break; } } else rdr->ifp = NULL; TAILQ_INSERT_TAIL(pf_rdrs_inactive, rdr, entries); break; } case DIOCCOMMITRDRS: { u_int32_t *ticket = (u_int32_t *)addr; struct pf_rdrqueue *old_rdrs; struct pf_rdr *rdr; if (*ticket != ticket_rdrs_inactive) { error = EBUSY; break; } /* Swap rdrs, keep the old. */ s = splsoftnet(); old_rdrs = pf_rdrs_active; pf_rdrs_active = pf_rdrs_inactive; pf_rdrs_inactive = old_rdrs; ticket_rdrs_active = ticket_rdrs_inactive; splx(s); /* Purge the old rdr list */ while ((rdr = TAILQ_FIRST(old_rdrs)) != NULL) { TAILQ_REMOVE(old_rdrs, rdr, entries); pool_put(&pf_rdr_pl, rdr); } break; } case DIOCGETRDRS: { struct pfioc_rdr *pr = (struct pfioc_rdr *)addr; struct pf_rdr *rdr; pr->nr = 0; s = splsoftnet(); TAILQ_FOREACH(rdr, pf_rdrs_active, entries) pr->nr++; pr->ticket = ticket_rdrs_active; splx(s); break; } case DIOCGETRDR: { struct pfioc_rdr *pr = (struct pfioc_rdr *)addr; struct pf_rdr *rdr; u_int32_t nr; if (pr->ticket != ticket_rdrs_active) { error = EBUSY; break; } nr = 0; s = splsoftnet(); rdr = TAILQ_FIRST(pf_rdrs_active); while ((rdr != NULL) && (nr < pr->nr)) { rdr = TAILQ_NEXT(rdr, entries); nr++; } if (rdr == NULL) { error = EBUSY; splx(s); break; } bcopy(rdr, &pr->rdr, sizeof(struct pf_rdr)); splx(s); break; } case DIOCCHANGERDR: { struct pfioc_changerdr *pcn = (struct pfioc_changerdr *)addr; struct pf_rdr *oldrdr = NULL, *newrdr = NULL; if (pcn->action < PF_CHANGE_ADD_HEAD || pcn->action > PF_CHANGE_REMOVE) { error = EINVAL; break; } if (pcn->action != PF_CHANGE_REMOVE) { newrdr = pool_get(&pf_rdr_pl, PR_NOWAIT); if (newrdr == NULL) { error = ENOMEM; break; } bcopy(&pcn->newrdr, newrdr, sizeof(struct pf_rdr)); #ifndef INET if (newrdr->af == AF_INET) { error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (newrdr->af == AF_INET6) { error = EAFNOSUPPORT; break; } #endif /* INET6 */ newrdr->ifp = NULL; if (newrdr->ifname[0]) { newrdr->ifp = ifunit(newrdr->ifname); if (newrdr->ifp == NULL) { pool_put(&pf_rdr_pl, newrdr); error = EINVAL; break; } } } s = splsoftnet(); if (pcn->action == PF_CHANGE_ADD_HEAD) oldrdr = TAILQ_FIRST(pf_rdrs_active); else if (pcn->action == PF_CHANGE_ADD_TAIL) oldrdr = TAILQ_LAST(pf_rdrs_active, pf_rdrqueue); else { oldrdr = TAILQ_FIRST(pf_rdrs_active); while ((oldrdr != NULL) && pf_compare_rdrs(oldrdr, &pcn->oldrdr)) oldrdr = TAILQ_NEXT(oldrdr, entries); if (oldrdr == NULL) { error = EINVAL; splx(s); break; } } if (pcn->action == PF_CHANGE_REMOVE) { TAILQ_REMOVE(pf_rdrs_active, oldrdr, entries); pool_put(&pf_rdr_pl, oldrdr); } else { if (oldrdr == NULL) TAILQ_INSERT_TAIL(pf_rdrs_active, newrdr, entries); else if (pcn->action == PF_CHANGE_ADD_HEAD || pcn->action == PF_CHANGE_ADD_BEFORE) TAILQ_INSERT_BEFORE(oldrdr, newrdr, entries); else TAILQ_INSERT_AFTER(pf_rdrs_active, oldrdr, newrdr, entries); } ticket_rdrs_active++; splx(s); break; } case DIOCCLRSTATES: { struct pf_tree_node *n; s = splsoftnet(); for (n = pf_tree_first(tree_ext_gwy); n != NULL; n = pf_tree_next(n)) n->state->expire = 0; pf_purge_expired_states(); splx(s); break; } case DIOCGETSTATE: { struct pfioc_state *ps = (struct pfioc_state *)addr; struct pf_tree_node *n; u_int32_t nr; nr = 0; s = splsoftnet(); n = pf_tree_first(tree_ext_gwy); while ((n != NULL) && (nr < ps->nr)) { n = pf_tree_next(n); nr++; } if (n == NULL) { error = EBUSY; splx(s); break; } bcopy(n->state, &ps->state, sizeof(struct pf_state)); splx(s); microtime(&pftv); ps->state.creation = pftv.tv_sec - ps->state.creation; if (ps->state.expire <= pftv.tv_sec) ps->state.expire = 0; else ps->state.expire -= pftv.tv_sec; break; } case DIOCGETSTATES: { struct pfioc_states *ps = (struct pfioc_states *)addr; struct pf_tree_node *n; struct pf_state *p, pstore; u_int32_t nr = 0; int space = ps->ps_len; if (space == 0) { s = splsoftnet(); n = pf_tree_first(tree_ext_gwy); while (n != NULL) { n = pf_tree_next(n); nr++; } splx(s); ps->ps_len = sizeof(struct pf_state) * nr; return (0); } microtime(&pftv); s = splsoftnet(); p = ps->ps_states; n = pf_tree_first(tree_ext_gwy); while (n && (nr + 1) * sizeof(*p) <= ps->ps_len) { bcopy(n->state, &pstore, sizeof(pstore)); pstore.creation = pftv.tv_sec - pstore.creation; if (pstore.expire <= pftv.tv_sec) pstore.expire = 0; else pstore.expire -= pftv.tv_sec; error = copyout(&pstore, p, sizeof(*p)); if (error) { splx(s); goto fail; } p++; nr++; n = pf_tree_next(n); } ps->ps_len = sizeof(struct pf_state) * nr; splx(s); break; } case DIOCSETSTATUSIF: { struct pfioc_if *pi = (struct pfioc_if *)addr; struct ifnet *ifp; if ((ifp = ifunit(pi->ifname)) == NULL) error = EINVAL; else status_ifp = ifp; break; } case DIOCGETSTATUS: { struct pf_status *s = (struct pf_status *)addr; bcopy(&pf_status, s, sizeof(struct pf_status)); break; } case DIOCCLRSTATUS: { u_int8_t running = pf_status.running; u_int32_t states = pf_status.states; bzero(&pf_status, sizeof(struct pf_status)); pf_status.running = running; pf_status.states = states; break; } case DIOCNATLOOK: { struct pfioc_natlook *pnl = (struct pfioc_natlook *)addr; struct pf_state *st; struct pf_tree_key key; int direction = pnl->direction; key.af = pnl->af; key.proto = pnl->proto; /* * userland gives us source and dest of connetion, reverse * the lookup so we ask for what happens with the return * traffic, enabling us to find it in the state tree. */ PF_ACPY(&key.addr[1], &pnl->saddr, pnl->af); key.port[1] = pnl->sport; PF_ACPY(&key.addr[0], &pnl->daddr, pnl->af); key.port[0] = pnl->dport; if (!pnl->proto || !PF_AZERO(&pnl->saddr, pnl->af) || !PF_AZERO(&pnl->daddr, pnl->af) || !pnl->dport || !pnl->sport) error = EINVAL; else { s = splsoftnet(); if (direction == PF_IN) st = pf_find_state(tree_ext_gwy, &key); else st = pf_find_state(tree_lan_ext, &key); if (st != NULL) { if (direction == PF_IN) { PF_ACPY(&pnl->rsaddr, &st->lan.addr, st->af); pnl->rsport = st->lan.port; PF_ACPY(&pnl->rdaddr, &pnl->daddr, pnl->af); pnl->rdport = pnl->dport; } else { PF_ACPY(&pnl->rdaddr, &st->gwy.addr, st->af); pnl->rdport = st->gwy.port; PF_ACPY(&pnl->rsaddr, &pnl->saddr, pnl->af); pnl->rsport = pnl->sport; } } else error = ENOENT; splx(s); } break; } case DIOCSETTIMEOUT: { struct pfioc_tm *pt = (struct pfioc_tm *)addr; int old; if (pt->timeout < 0 || pt->timeout >= PFTM_MAX || pt->seconds < 0) { error = EINVAL; goto fail; } old = *pftm_timeouts[pt->timeout]; *pftm_timeouts[pt->timeout] = pt->seconds; pt->seconds = old; break; } case DIOCGETTIMEOUT: { struct pfioc_tm *pt = (struct pfioc_tm *)addr; if (pt->timeout < 0 || pt->timeout >= PFTM_MAX) { error = EINVAL; goto fail; } pt->seconds = *pftm_timeouts[pt->timeout]; break; } case DIOCSETDEBUG: { u_int32_t *level = (u_int32_t *)addr; pf_status.debug = *level; break; } default: error = ENODEV; break; } fail: return (error); } #define PF_CALC_SKIP_STEP(i, c) \ do { \ if (a & 1 << i) { \ if (c) \ r->skip[i] = TAILQ_NEXT(s, entries); \ else \ a ^= 1 << i; \ } \ } while (0) void pf_calc_skip_steps(struct pf_rulequeue *rules) { struct pf_rule *r, *s; int a, i; r = TAILQ_FIRST(rules); while (r != NULL) { a = 0; for (i = 0; i < 6; ++i) { a |= 1 << i; r->skip[i] = TAILQ_NEXT(r, entries); } s = TAILQ_NEXT(r, entries); while (a && s != NULL) { PF_CALC_SKIP_STEP(0, s->ifp == r->ifp); PF_CALC_SKIP_STEP(1, s->af == r->af); PF_CALC_SKIP_STEP(2, s->proto == r->proto); PF_CALC_SKIP_STEP(3, PF_AEQ(&s->src.addr, &r->src.addr, r->af) && PF_AEQ(&s->src.mask, &r->src.mask, r->af) && s->src.not == r->src.not); PF_CALC_SKIP_STEP(4, s->src.port[0] == r->src.port[0] && s->src.port[1] == r->src.port[1] && s->src.port_op == r->src.port_op); PF_CALC_SKIP_STEP(5, PF_AEQ(&s->dst.addr, &r->dst.addr, r->af) && PF_AEQ(&s->dst.mask, &r->dst.mask, r->af) && s->dst.not == r->dst.not); PF_CALC_SKIP_STEP(6, s->dst.port[0] == r->dst.port[0] && s->dst.port[1] == r->dst.port[1] && s->dst.port_op == r->dst.port_op); s = TAILQ_NEXT(s, entries); } r = TAILQ_NEXT(r, entries); } } u_int16_t pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) { u_int32_t l; if (udp && !cksum) return 0x0000; l = cksum + old - new; l = (l >> 16) + (l & 65535); l = l & 65535; if (udp && !l) return 0xFFFF; return (l); } void pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u, int af) { struct pf_addr ao; u_int16_t po = *p; PF_ACPY(&ao, a, af); PF_ACPY(a, an, af); *p = pn; switch (af) { #ifdef INET case AF_INET: *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, ao.addr16[0], an->addr16[0], 0), ao.addr16[1], an->addr16[1], 0); *p = pn; *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, ao.addr16[0], an->addr16[0], u), ao.addr16[1], an->addr16[1], u), po, pn, u); break; #endif /* INET */ #ifdef INET6 case AF_INET6: *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, ao.addr16[0], an->addr16[0], u), ao.addr16[1], an->addr16[1], u), ao.addr16[2], an->addr16[2], u), ao.addr16[3], an->addr16[3], u), ao.addr16[4], an->addr16[4], u), ao.addr16[5], an->addr16[5], u), ao.addr16[6], an->addr16[6], u), ao.addr16[7], an->addr16[7], u), po, pn, u); break; #endif /* INET6 */ } } void pf_change_a(u_int32_t *a, u_int16_t *c, u_int32_t an, u_int8_t u) { u_int32_t ao = *a; *a = an; *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), ao % 65536, an % 65536, u); } #ifdef INET6 void pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) { struct pf_addr ao; PF_ACPY(&ao, a, AF_INET6); PF_ACPY(a, an, AF_INET6); *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(*c, ao.addr16[0], an->addr16[0], u), ao.addr16[1], an->addr16[1], u), ao.addr16[2], an->addr16[2], u), ao.addr16[3], an->addr16[3], u), ao.addr16[4], an->addr16[4], u), ao.addr16[5], an->addr16[5], u), ao.addr16[6], an->addr16[6], u), ao.addr16[7], an->addr16[7], u); } #endif /* INET6 */ void pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, u_int16_t *ic, u_int16_t *hc, u_int8_t u, int af) { struct pf_addr oia, ooa; u_int32_t opc, oh2c = *h2c; u_int16_t oip = *ip; PF_ACPY(&oia, ia, af); PF_ACPY(&ooa, oa, af); if (pc != NULL) opc = *pc; /* Change inner protocol port, fix inner protocol checksum. */ *ip = np; if (pc != NULL) *pc = pf_cksum_fixup(*pc, oip, *ip, u); *ic = pf_cksum_fixup(*ic, oip, *ip, 0); if (pc != NULL) *ic = pf_cksum_fixup(*ic, opc, *pc, 0); PF_ACPY(ia, na, af); /* Change inner ip address, fix inner ipv4 checksum and icmp checksum. */ switch (af) { #ifdef INET case AF_INET: *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, oia.addr16[0], ia->addr16[0], 0), oia.addr16[1], ia->addr16[1], 0); *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, oia.addr16[0], ia->addr16[0], 0), oia.addr16[1], ia->addr16[1], 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(*ic, oia.addr16[0], ia->addr16[0], u), oia.addr16[1], ia->addr16[1], u), oia.addr16[2], ia->addr16[2], u), oia.addr16[3], ia->addr16[3], u), oia.addr16[4], ia->addr16[4], u), oia.addr16[5], ia->addr16[5], u), oia.addr16[6], ia->addr16[6], u), oia.addr16[7], ia->addr16[7], u); break; #endif /* INET6 */ } *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); /* Change outer ip address, fix outer ipv4 or icmpv6 checksum. */ PF_ACPY(oa, na, af); switch (af) { #ifdef INET case AF_INET: *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, ooa.addr16[0], oa->addr16[0], 0), ooa.addr16[1], oa->addr16[1], 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( pf_cksum_fixup(pf_cksum_fixup(*ic, ooa.addr16[0], oa->addr16[0], u), ooa.addr16[1], oa->addr16[1], u), ooa.addr16[2], oa->addr16[2], u), ooa.addr16[3], oa->addr16[3], u), ooa.addr16[4], oa->addr16[4], u), ooa.addr16[5], oa->addr16[5], u), ooa.addr16[6], oa->addr16[6], u), ooa.addr16[7], oa->addr16[7], u); break; #endif /* INET6 */ } } void pf_send_reset(int off, struct tcphdr *th, struct pf_pdesc *pd, int af) { struct mbuf *m; struct m_tag *mtag; int len; #ifdef INET struct ip *h2; #endif /* INET */ #ifdef INET6 struct ip6_hdr *h2_6; #endif /* INET6 */ struct tcphdr *th2; switch (af) { #ifdef INET case AF_INET: len = sizeof(struct ip) + sizeof(struct tcphdr); break; #endif /* INET */ #ifdef INET6 case AF_INET6: len = sizeof(struct ip6_hdr) + sizeof(struct tcphdr); break; #endif /* INET6 */ } /* don't reply to RST packets */ if (th->th_flags & TH_RST) return; /* create outgoing mbuf */ mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); if (mtag == NULL) return; m = m_gethdr(M_DONTWAIT, MT_HEADER); if (m == NULL) { m_tag_free(mtag); return; } m_tag_prepend(m, mtag); m->m_data += max_linkhdr; m->m_pkthdr.len = m->m_len = len; m->m_pkthdr.rcvif = NULL; bzero(m->m_data, len); switch (af) { #ifdef INET case AF_INET: h2 = mtod(m, struct ip *); /* IP header fields included in the TCP checksum */ h2->ip_p = IPPROTO_TCP; h2->ip_len = htons(sizeof(*th2)); h2->ip_src.s_addr = pd->dst->v4.s_addr; h2->ip_dst.s_addr = pd->src->v4.s_addr; th2 = (struct tcphdr *)((caddr_t)h2 + sizeof(struct ip)); break; #endif /* INET */ #ifdef INET6 case AF_INET6: h2_6 = mtod(m, struct ip6_hdr *); /* IP header fields included in the TCP checksum */ h2_6->ip6_nxt = IPPROTO_TCP; h2_6->ip6_plen = htons(sizeof(*th2)); memcpy(&h2_6->ip6_src, pd->dst, sizeof(struct in6_addr)); memcpy(&h2_6->ip6_dst, pd->src, sizeof(struct in6_addr)); th2 = (struct tcphdr *)((caddr_t)h2_6 + sizeof(struct ip6_hdr)); break; #endif /* INET6 */ } /* TCP header */ th2->th_sport = th->th_dport; th2->th_dport = th->th_sport; if (th->th_flags & TH_ACK) { th2->th_seq = th->th_ack; th2->th_flags = TH_RST; } else { int tlen = pd->p_len - off - (th->th_off << 2); if (th->th_flags & TH_SYN) tlen++; if (th->th_flags & TH_FIN) tlen++; th2->th_ack = htonl(ntohl(th->th_seq) + tlen); th2->th_flags = TH_RST | TH_ACK; } th2->th_off = sizeof(*th2) >> 2; switch (af) { #ifdef INET case AF_INET: /* TCP checksum */ th2->th_sum = in_cksum(m, len); /* Finish the IP header */ h2->ip_v = 4; h2->ip_hl = sizeof(*h2) >> 2; h2->ip_ttl = 128; h2->ip_sum = 0; h2->ip_len = len; h2->ip_off = 0; ip_output(m, NULL, NULL, 0, NULL, NULL); break; #endif /* INET */ #ifdef INET6 case AF_INET6: /* TCP checksum */ th2->th_sum = in6_cksum(m, IPPROTO_TCP, sizeof(struct ip6_hdr), sizeof(*th)); h2_6->ip6_hlim = 128; ip6_output(m, NULL, NULL, 0, NULL, NULL); #endif /* INET6 */ } } void pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, int af) { struct m_tag *mtag; struct mbuf *m0; mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); if (mtag == NULL) return; m0 = m_copy(m, 0, M_COPYALL); if (m0 == NULL) { m_tag_free(mtag); return; } m_tag_prepend(m0, mtag); switch (af) { #ifdef INET case AF_INET: icmp_error(m0, type, code, 0, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: icmp6_error(m0, type, code, 0); break; #endif /* INET6 */ } } /* * Return 1 if the addresses a and b match (with mask m), otherwise return 0. * If n is 0, they match if they are equal. If n is != 0, they match if they * are different. */ int pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, struct pf_addr *b, int af) { int match = 0; switch (af) { #ifdef INET case AF_INET: if ((a->addr32[0] & m->addr32[0]) == (b->addr32[0] & m->addr32[0])) match++; break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (((a->addr32[0] & m->addr32[0]) == (b->addr32[0] & m->addr32[0])) && ((a->addr32[1] & m->addr32[1]) == (b->addr32[1] & m->addr32[1])) && ((a->addr32[2] & m->addr32[2]) == (b->addr32[2] & m->addr32[2])) && ((a->addr32[3] & m->addr32[3]) == (b->addr32[3] & m->addr32[3]))) match++; break; #endif /* INET6 */ } if (match) { if (n) return (0); else return (1); } else { if (n) return (1); else return (0); } } int pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) { NTOHS(a1); NTOHS(a2); NTOHS(p); switch (op) { case PF_OP_IRG: return (p > a1) && (p < a2); case PF_OP_XRG: return (p < a1) || (p > a2); case PF_OP_EQ: return (p == a1); case PF_OP_NE: return (p != a1); case PF_OP_LT: return (p < a1); case PF_OP_LE: return (p <= a1); case PF_OP_GT: return (p > a1); case PF_OP_GE: return (p >= a1); } return (0); /* never reached */ } int pf_chk_sport(struct pf_port_list *plist, u_int16_t port) { struct pf_port_node *pnode; LIST_FOREACH(pnode, plist, next) { if (pnode->port == port) return (1); } return (0); } int pf_add_sport(struct pf_port_list *plist, u_int16_t port) { struct pf_port_node *pnode; pnode = pool_get(&pf_sport_pl, M_NOWAIT); if (pnode == NULL) return (ENOMEM); pnode->port = port; LIST_INSERT_HEAD(plist, pnode, next); return (0); } void pf_put_sport(u_int8_t proto, u_int16_t port) { struct pf_port_list *plist; struct pf_port_node *pnode; if (proto == IPPROTO_TCP) plist = &pf_tcp_ports; else if (proto == IPPROTO_UDP) plist = &pf_udp_ports; else return; LIST_FOREACH(pnode, plist, next) { if (pnode->port == port) { LIST_REMOVE(pnode, next); pool_put(&pf_sport_pl, pnode); break; } } } int pf_get_sport(u_int8_t proto, u_int16_t low, u_int16_t high, u_int16_t *port) { struct pf_port_list *plist; int step; u_int16_t cut; if (proto == IPPROTO_TCP) plist = &pf_tcp_ports; else if (proto == IPPROTO_UDP) plist = &pf_udp_ports; else return (EINVAL); /* port search; start random, step; similar 2 portloop in in_pcbbind */ if (low == high) { *port = low; if (!pf_chk_sport(plist, *port)) goto found; return (1); } else if (low < high) { step = 1; cut = arc4random() % (high - low) + low; } else { step = -1; cut = arc4random() % (low - high) + high; } *port = cut - step; do { *port += step; if (!pf_chk_sport(plist, *port)) goto found; } while (*port != low && *port != high); step = -step; *port = cut; do { *port += step; if (!pf_chk_sport(plist, *port)) goto found; } while (*port != low && *port != high); return (1); /* none available */ found: return (pf_add_sport(plist, *port)); } struct pf_nat * pf_get_nat(struct ifnet *ifp, u_int8_t proto, struct pf_addr *saddr, struct pf_addr *daddr, int af) { struct pf_nat *n, *nm = NULL; n = TAILQ_FIRST(pf_nats_active); while (n && nm == NULL) { if (((n->ifp == NULL) || (n->ifp == ifp && !n->ifnot) || (n->ifp != ifp && n->ifnot)) && (!n->proto || n->proto == proto) && (!n->af || n->af == af) && PF_MATCHA(n->snot, &n->saddr, &n->smask, saddr, af) && PF_MATCHA(n->dnot, &n->daddr, &n->dmask, daddr, af)) nm = n; else n = TAILQ_NEXT(n, entries); } return (nm); } struct pf_binat * pf_get_binat(int direction, struct ifnet *ifp, u_int8_t proto, struct pf_addr *saddr, struct pf_addr *daddr, int af) { struct pf_binat *b, *bm = NULL; struct pf_addr fullmask; memset(&fullmask, 0xff, sizeof(fullmask)); b = TAILQ_FIRST(pf_binats_active); while (b && bm == NULL) { if (direction == PF_OUT && b->ifp == ifp && (!b->proto || b->proto == proto) && (!b->af || b->af == af) && PF_MATCHA(0, &b->saddr, &fullmask, saddr, af) && PF_MATCHA(b->dnot, &b->daddr, &b->dmask, daddr, af)) bm = b; else if (direction == PF_IN && b->ifp == ifp && (!b->proto || b->proto == proto) && (!b->af || b->af == af) && PF_MATCHA(0, &b->raddr, &fullmask, saddr, af) && PF_MATCHA(b->dnot, &b->daddr, &b->dmask, daddr, af)) bm = b; else b = TAILQ_NEXT(b, entries); } return (bm); } struct pf_rdr * pf_get_rdr(struct ifnet *ifp, u_int8_t proto, struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, int af) { struct pf_rdr *r, *rm = NULL; r = TAILQ_FIRST(pf_rdrs_active); while (r && rm == NULL) { if (((r->ifp == NULL) || (r->ifp == ifp && !r->ifnot) || (r->ifp != ifp && r->ifnot)) && (!r->proto || r->proto == proto) && (!r->af || r->af == af) && PF_MATCHA(r->snot, &r->saddr, &r->smask, saddr, af) && PF_MATCHA(r->dnot, &r->daddr, &r->dmask, daddr, af) && ((!r->dport2 && dport == r->dport) || (r->dport2 && (ntohs(dport) >= ntohs(r->dport)) && ntohs(dport) <= ntohs(r->dport2)))) rm = r; else r = TAILQ_NEXT(r, entries); } return (rm); } u_int16_t pf_map_port_range(struct pf_rdr *rdr, u_int16_t port) { u_int32_t nport; nport = ntohs(rdr->rport) - ntohs(rdr->dport) + ntohs(port); /* wrap around if necessary */ if (nport > 65535) nport -= 65535; return htons((u_int16_t)nport); } int pf_test_tcp(int direction, struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd) { struct pf_nat *nat = NULL; struct pf_binat *binat = NULL; struct pf_rdr *rdr = NULL; struct pf_addr *saddr = pd->src, *daddr = pd->dst, baddr; struct tcphdr *th = pd->hdr.tcp; struct pf_rule *r, *rm = NULL; u_int16_t bport, nport = 0, af = pd->af; u_short reason; int rewrite = 0, error; if (direction == PF_OUT) { /* check outgoing packet for BINAT */ if ((binat = pf_get_binat(PF_OUT, ifp, IPPROTO_TCP, saddr, daddr, af)) != NULL) { PF_ACPY(&baddr, saddr, af); bport = th->th_sport; pf_change_ap(saddr, &th->th_sport, pd->ip_sum, &th->th_sum, &binat->raddr, th->th_sport, 0, af); rewrite++; } /* check outgoing packet for NAT */ else if ((nat = pf_get_nat(ifp, IPPROTO_TCP, saddr, daddr, af)) != NULL) { bport = th->th_sport; error = pf_get_sport(IPPROTO_TCP, 50001, 65535, &nport); if (error) return (PF_DROP); PF_ACPY(&baddr, saddr, af); pf_change_ap(saddr, &th->th_sport, pd->ip_sum, &th->th_sum, &nat->raddr, htons(nport), 0, af); rewrite++; } } else { /* check incoming packet for RDR */ if ((rdr = pf_get_rdr(ifp, IPPROTO_TCP, saddr, daddr, th->th_dport, af)) != NULL) { bport = th->th_dport; if (rdr->opts & PF_RPORT_RANGE) nport = pf_map_port_range(rdr, th->th_dport); else nport = rdr->rport; PF_ACPY(&baddr, daddr, af); pf_change_ap(daddr, &th->th_dport, pd->ip_sum, &th->th_sum, &rdr->raddr, nport, 0, af); rewrite++; } /* check incoming packet for BINAT */ else if ((binat = pf_get_binat(PF_IN, ifp, IPPROTO_TCP, daddr, saddr, af)) != NULL) { PF_ACPY(&baddr, daddr, af); bport = th->th_dport; pf_change_ap(daddr, &th->th_dport, pd->ip_sum, &th->th_sum, &binat->saddr, th->th_dport, 0, af); rewrite++; } } r = TAILQ_FIRST(pf_rules_active); while (r != NULL) { if (r->action == PF_SCRUB) { r = TAILQ_NEXT(r, entries); continue; } r->evaluations++; if (r->ifp != NULL && r->ifp != ifp) r = r->skip[0]; else if (r->af && r->af != af) r = r->skip[1]; else if (r->proto && r->proto != IPPROTO_TCP) r = r->skip[2]; else if (!PF_AZERO(&r->src.mask, af) && !PF_MATCHA(r->src.not, &r->src.addr, &r->src.mask, saddr, af)) r = r->skip[3]; else if (r->src.port_op && !pf_match_port(r->src.port_op, r->src.port[0], r->src.port[1], th->th_sport)) r = r->skip[4]; else if (!PF_AZERO(&r->dst.mask, af) && !PF_MATCHA(r->dst.not, &r->dst.addr, &r->dst.mask, daddr, af)) r = r->skip[5]; else if (r->dst.port_op && !pf_match_port(r->dst.port_op, r->dst.port[0], r->dst.port[1], th->th_dport)) r = r->skip[6]; else if (r->direction != direction) r = TAILQ_NEXT(r, entries); else if ((r->flagset & th->th_flags) != r->flags) r = TAILQ_NEXT(r, entries); else { rm = r; if (rm->quick) break; r = TAILQ_NEXT(r, entries); } } if (rm != NULL) { rm->packets++; rm->bytes += pd->tot_len; REASON_SET(&reason, PFRES_MATCH); /* XXX will log packet before rewrite */ if (rm->log) PFLOG_PACKET(ifp, h, m, af, direction, reason, rm); if ((rm->action == PF_DROP) && ((rm->rule_flag & PFRULE_RETURNRST) || rm->return_icmp)) { /* undo NAT/RST changes, if they have taken place */ if (nat != NULL || (binat != NULL && direction == PF_OUT)) { pf_change_ap(saddr, &th->th_sport, pd->ip_sum, &th->th_sum, &baddr, bport, 0, af); rewrite++; } else if (rdr != NULL || (binat != NULL && direction == PF_IN)) { pf_change_ap(daddr, &th->th_dport, pd->ip_sum, &th->th_sum, &baddr, bport, 0, af); rewrite++; } if (rm->rule_flag & PFRULE_RETURNRST) pf_send_reset(off, th, pd, af); else pf_send_icmp(m, rm->return_icmp >> 8, rm->return_icmp & 255, af); } if (rm->action == PF_DROP) { if (nport && nat != NULL) pf_put_sport(IPPROTO_TCP, nport); return (PF_DROP); } } if (((rm != NULL) && rm->keep_state) || nat != NULL || binat != NULL || rdr != NULL) { /* create new state */ u_int16_t len; struct pf_state *s; len = pd->tot_len - off - (th->th_off << 2); s = pool_get(&pf_state_pl, PR_NOWAIT); if (s == NULL) { if (nport && nat != NULL) pf_put_sport(IPPROTO_TCP, nport); return (PF_DROP); } s->rule = rm; s->log = rm && (rm->log & 2); s->proto = IPPROTO_TCP; s->direction = direction; s->af = af; if (direction == PF_OUT) { PF_ACPY(&s->gwy.addr, saddr, af); s->gwy.port = th->th_sport; /* sport */ PF_ACPY(&s->ext.addr, daddr, af); s->ext.port = th->th_dport; if (nat != NULL || binat != NULL) { PF_ACPY(&s->lan.addr, &baddr, af); s->lan.addr = baddr; s->lan.port = bport; } else { PF_ACPY(&s->lan.addr, &s->gwy.addr, af); s->lan.port = s->gwy.port; } } else { PF_ACPY(&s->lan.addr, daddr, af); s->lan.port = th->th_dport; PF_ACPY(&s->ext.addr, saddr, af); s->ext.port = th->th_sport; if (binat != NULL ||rdr != NULL) { PF_ACPY(&s->gwy.addr, &baddr, af); s->gwy.port = bport; } else { PF_ACPY(&s->gwy.addr, &s->lan.addr, af); s->gwy.port = s->lan.port; } } s->src.seqlo = ntohl(th->th_seq); s->src.seqhi = s->src.seqlo + len + 1; if (th->th_flags == TH_SYN && rm != NULL && rm->keep_state == PF_STATE_MODULATE) { /* Generate sequence number modulator */ while ((s->src.seqdiff = arc4random()) == 0) ; pf_change_a(&th->th_seq, &th->th_sum, htonl(s->src.seqlo + s->src.seqdiff), 0); rewrite = 1; } else s->src.seqdiff = 0; if (th->th_flags & TH_SYN) s->src.seqhi++; if (th->th_flags & TH_FIN) s->src.seqhi++; s->src.max_win = MAX(ntohs(th->th_win), 1); s->dst.seqlo = 0; /* Haven't seen these yet */ s->dst.seqhi = 1; s->dst.max_win = 1; s->dst.seqdiff = 0; /* Defer random generation */ s->src.state = TCPS_SYN_SENT; s->dst.state = TCPS_CLOSED; s->creation = pftv.tv_sec; s->expire = pftv.tv_sec + pftm_tcp_first_packet; s->packets = 1; s->bytes = pd->tot_len; pf_insert_state(s); } /* copy back packet headers if we performed NAT operations */ if (rewrite) m_copyback(m, off, sizeof(*th), (caddr_t)th); return (PF_PASS); } int pf_test_udp(int direction, struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd) { struct pf_nat *nat = NULL; struct pf_binat *binat = NULL; struct pf_rdr *rdr = NULL; struct pf_addr *saddr = pd->src, *daddr = pd->dst, baddr; struct udphdr *uh = pd->hdr.udp; u_int16_t bport, nport = 0, af = pd->af; struct pf_rule *r, *rm = NULL; u_short reason; int rewrite = 0, error; if (direction == PF_OUT) { /* check outgoing packet for BINAT */ if ((binat = pf_get_binat(PF_OUT, ifp, IPPROTO_UDP, saddr, daddr, af)) != NULL) { PF_ACPY(&baddr, saddr, af); bport = uh->uh_sport; pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, &uh->uh_sum, &binat->raddr, uh->uh_sport, 1, af); rewrite++; } /* check outgoing packet for NAT */ else if ((nat = pf_get_nat(ifp, IPPROTO_UDP, saddr, daddr, af)) != NULL) { bport = uh->uh_sport; error = pf_get_sport(IPPROTO_UDP, 50001, 65535, &nport); if (error) return (PF_DROP); PF_ACPY(&baddr, saddr, af); pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, &uh->uh_sum, &nat->raddr, htons(nport), 1, af); rewrite++; } } else { /* check incoming packet for RDR */ if ((rdr = pf_get_rdr(ifp, IPPROTO_UDP, saddr, daddr, uh->uh_dport, af)) != NULL) { bport = uh->uh_dport; if (rdr->opts & PF_RPORT_RANGE) nport = pf_map_port_range(rdr, uh->uh_dport); else nport = rdr->rport; PF_ACPY(&baddr, daddr, af); pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, &uh->uh_sum, &rdr->raddr, nport, 1, af); rewrite++; } /* check incoming packet for BINAT */ else if ((binat = pf_get_binat(PF_IN, ifp, IPPROTO_UDP, daddr, daddr, af)) != NULL) { PF_ACPY(&baddr, daddr, af); bport = uh->uh_dport; pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, &uh->uh_sum, &binat->saddr, uh->uh_dport, 1, af); rewrite++; } } r = TAILQ_FIRST(pf_rules_active); while (r != NULL) { if (r->action == PF_SCRUB) { r = TAILQ_NEXT(r, entries); continue; } r->evaluations++; if (r->ifp != NULL && r->ifp != ifp) r = r->skip[0]; else if (r->af && r->af != af) r = r->skip[1]; else if (r->proto && r->proto != IPPROTO_UDP) r = r->skip[2]; else if (!PF_AZERO(&r->src.mask, af) && !PF_MATCHA(r->src.not, &r->src.addr, &r->src.mask, saddr, af)) r = r->skip[3]; else if (r->src.port_op && !pf_match_port(r->src.port_op, r->src.port[0], r->src.port[1], uh->uh_sport)) r = r->skip[4]; else if (!PF_AZERO(&r->dst.mask, af) && !PF_MATCHA(r->dst.not, &r->dst.addr, &r->dst.mask, daddr, af)) r = r->skip[5]; else if (r->dst.port_op && !pf_match_port(r->dst.port_op, r->dst.port[0], r->dst.port[1], uh->uh_dport)) r = r->skip[6]; else if (r->direction != direction) r = TAILQ_NEXT(r, entries); else { rm = r; if (rm->quick) break; r = TAILQ_NEXT(r, entries); } } if (rm != NULL) { rm->packets++; rm->bytes += pd->tot_len; REASON_SET(&reason, PFRES_MATCH); /* XXX will log packet before rewrite */ if (rm->log) PFLOG_PACKET(ifp, h, m, af, direction, reason, rm); if ((rm->action == PF_DROP) && rm->return_icmp) { /* undo NAT/RST changes, if they have taken place */ if (nat != NULL || (binat != NULL && direction == PF_OUT)) { pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, &uh->uh_sum, &baddr, bport, 1, af); rewrite++; } else if (rdr != NULL || (binat != NULL && direction == PF_IN)) { pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, &uh->uh_sum, &baddr, bport, 1, af); rewrite++; } pf_send_icmp(m, rm->return_icmp >> 8, rm->return_icmp & 255, af); } if (rm->action == PF_DROP) { if (nport && nat != NULL) pf_put_sport(IPPROTO_UDP, nport); return (PF_DROP); } } if ((rm != NULL && rm->keep_state) || nat != NULL || binat != NULL || rdr != NULL) { /* create new state */ u_int16_t len; struct pf_state *s; len = pd->tot_len - off - sizeof(*uh); s = pool_get(&pf_state_pl, PR_NOWAIT); if (s == NULL) { if (nport && nat != NULL) pf_put_sport(IPPROTO_UDP, nport); return (PF_DROP); } s->rule = rm; s->log = rm && (rm->log & 2); s->proto = IPPROTO_UDP; s->direction = direction; s->af = af; if (direction == PF_OUT) { PF_ACPY(&s->gwy.addr, saddr, af); s->gwy.port = uh->uh_sport; PF_ACPY(&s->ext.addr, daddr, af); s->ext.port = uh->uh_dport; if (nat != NULL || binat != NULL) { PF_ACPY(&s->lan.addr, &baddr, af); s->lan.port = bport; } else { PF_ACPY(&s->lan.addr, &s->gwy.addr, af); s->lan.port = s->gwy.port; } } else { PF_ACPY(&s->lan.addr, daddr, af); s->lan.port = uh->uh_dport; PF_ACPY(&s->ext.addr, saddr, af); s->ext.port = uh->uh_sport; if (binat != NULL || rdr != NULL) { PF_ACPY(&s->gwy.addr, &baddr, af); s->gwy.port = bport; } else { PF_ACPY(&s->gwy.addr, &s->lan.addr, af); s->gwy.port = s->lan.port; } } s->src.seqlo = 0; s->src.seqhi = 0; s->src.seqdiff = 0; s->src.max_win = 0; s->src.state = 1; s->dst.seqlo = 0; s->dst.seqhi = 0; s->dst.seqdiff = 0; s->dst.max_win = 0; s->dst.state = 0; s->creation = pftv.tv_sec; s->expire = pftv.tv_sec + pftm_udp_first_packet; s->packets = 1; s->bytes = pd->tot_len; pf_insert_state(s); } /* copy back packet headers if we performed NAT operations */ if (rewrite) m_copyback(m, off, sizeof(*uh), (caddr_t)uh); return (PF_PASS); } int pf_test_icmp(int direction, struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd) { struct pf_nat *nat = NULL; struct pf_binat *binat = NULL; struct pf_addr *saddr = pd->src, *daddr = pd->dst, baddr; struct pf_rule *r, *rm = NULL; u_short reason; u_int16_t icmpid, af = pd->af; u_int8_t icmptype, icmpcode; int rewrite = 0; switch (pd->proto) { #ifdef INET case IPPROTO_ICMP: icmptype = pd->hdr.icmp->icmp_type; icmpcode = pd->hdr.icmp->icmp_code; icmpid = pd->hdr.icmp->icmp_id; break; #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: icmptype = pd->hdr.icmp6->icmp6_type; icmpcode = pd->hdr.icmp6->icmp6_code; icmpid = pd->hdr.icmp6->icmp6_id; break; #endif /* INET6 */ } if (direction == PF_OUT) { /* check outgoing packet for BINAT */ if ((binat = pf_get_binat(PF_OUT, ifp, IPPROTO_ICMP, saddr, daddr, af)) != NULL) { PF_ACPY(&baddr, saddr, af); switch (af) { #ifdef INET case AF_INET: pf_change_a(&saddr->v4.s_addr, pd->ip_sum, binat->raddr.v4.s_addr, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, &binat->raddr, 0); rewrite++; break; #endif /* INET6 */ } } /* check outgoing packet for NAT */ else if ((nat = pf_get_nat(ifp, pd->proto, saddr, daddr, af)) != NULL) { PF_ACPY(&baddr, saddr, af); switch (af) { #ifdef INET case AF_INET: pf_change_a(&saddr->v4.s_addr, pd->ip_sum, nat->raddr.v4.s_addr, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, &nat->raddr, 0); rewrite++; break; #endif /* INET6 */ } } } else { /* check incoming packet for BINAT */ if ((binat = pf_get_binat(PF_IN, ifp, IPPROTO_ICMP, daddr, saddr, af)) != NULL) { PF_ACPY(&baddr, daddr, af); switch (af) { #ifdef INET case AF_INET: pf_change_a(&daddr->v4.s_addr, pd->ip_sum, binat->saddr.v4.s_addr, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, &binat->saddr, 0); rewrite++; break; #endif /* INET6 */ } } } r = TAILQ_FIRST(pf_rules_active); while (r != NULL) { if (r->action == PF_SCRUB) { r = TAILQ_NEXT(r, entries); continue; } r->evaluations++; if (r->ifp != NULL && r->ifp != ifp) r = r->skip[0]; else if (r->af && r->af != af) r = r->skip[1]; else if (r->proto && r->proto != pd->proto) r = r->skip[2]; else if (!PF_AZERO(&r->src.mask, af) && !PF_MATCHA(r->src.not, &r->src.addr, &r->src.mask, saddr, af)) r = r->skip[3]; else if (!PF_AZERO(&r->dst.mask, af) && !PF_MATCHA(r->dst.not, &r->dst.addr, &r->dst.mask, daddr, af)) r = r->skip[5]; else if (r->direction != direction) r = TAILQ_NEXT(r, entries); else if (r->ifp != NULL && r->ifp != ifp) r = TAILQ_NEXT(r, entries); else if (r->type && r->type != icmptype + 1) r = TAILQ_NEXT(r, entries); else if (r->code && r->code != icmpcode + 1) r = TAILQ_NEXT(r, entries); else { rm = r; if (rm->quick) break; r = TAILQ_NEXT(r, entries); } } if (rm != NULL) { rm->packets++; rm->bytes += pd->tot_len; REASON_SET(&reason, PFRES_MATCH); /* XXX will log packet before rewrite */ if (rm->log) PFLOG_PACKET(ifp, h, m, af, direction, reason, rm); if (rm->action != PF_PASS) return (PF_DROP); } if ((rm != NULL && rm->keep_state) || nat != NULL || binat != NULL) { /* create new state */ u_int16_t len; struct pf_state *s; len = pd->tot_len - off - ICMP_MINLEN; s = pool_get(&pf_state_pl, PR_NOWAIT); if (s == NULL) return (PF_DROP); s->rule = rm; s->log = rm && (rm->log & 2); s->proto = pd->proto; s->direction = direction; s->af = af; if (direction == PF_OUT) { PF_ACPY(&s->gwy.addr, saddr, af); s->gwy.port = icmpid; PF_ACPY(&s->ext.addr, daddr, af); s->ext.port = icmpid; if (nat != NULL || binat != NULL) PF_ACPY(&s->lan.addr, &baddr, af); else PF_ACPY(&s->lan.addr, &s->gwy.addr, af); s->lan.port = icmpid; } else { PF_ACPY(&s->lan.addr, daddr, af); s->lan.port = icmpid; PF_ACPY(&s->ext.addr, saddr, af); s->ext.port = icmpid; if (binat != NULL) PF_ACPY(&s->gwy.addr, &baddr, af); else PF_ACPY(&s->gwy.addr, &s->lan.addr, af); s->gwy.port = icmpid; } s->src.seqlo = 0; s->src.seqhi = 0; s->src.seqdiff = 0; s->src.max_win = 0; s->src.state = 0; s->dst.seqlo = 0; s->dst.seqhi = 0; s->dst.seqdiff = 0; s->dst.max_win = 0; s->dst.state = 0; s->creation = pftv.tv_sec; s->expire = pftv.tv_sec + pftm_icmp_first_packet; s->packets = 1; s->bytes = pd->tot_len; pf_insert_state(s); } /* copy back packet headers if we performed IPv6 NAT operations */ if (rewrite) m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp6); return (PF_PASS); } int pf_test_other(int direction, struct ifnet *ifp, struct mbuf *m, void *h, struct pf_pdesc *pd) { struct pf_rule *r, *rm = NULL; struct pf_binat *binat = NULL; struct pf_addr *saddr = pd->src, *daddr = pd->dst; u_int8_t af = pd->af; if (direction == PF_OUT) { /* check outgoing packet for BINAT */ if ((binat = pf_get_binat(PF_OUT, ifp, pd->proto, saddr, daddr, af)) != NULL) { switch (af) { #ifdef INET case AF_INET: pf_change_a(&saddr->v4.s_addr, pd->ip_sum, binat->raddr.v4.s_addr, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: PF_ACPY(saddr, &binat->raddr, af); break; #endif /* INET6 */ } } } else { /* check incoming packet for BINAT */ if ((binat = pf_get_binat(PF_IN, ifp, pd->proto, daddr, saddr, af)) != NULL) { switch (af) { #ifdef INET case AF_INET: pf_change_a(&daddr->v4.s_addr, pd->ip_sum, binat->saddr.v4.s_addr, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: PF_ACPY(daddr, &binat->saddr, af); break; #endif /* INET6 */ } } } r = TAILQ_FIRST(pf_rules_active); while (r != NULL) { if (r->action == PF_SCRUB) { r = TAILQ_NEXT(r, entries); continue; } r->evaluations++; if (r->ifp != NULL && r->ifp != ifp) r = r->skip[0]; else if (r->af && r->af != af) r = r->skip[1]; else if (r->proto && r->proto != pd->proto) r = r->skip[2]; else if (!PF_AZERO(&r->src.mask, af) && !PF_MATCHA(r->src.not, &r->src.addr, &r->src.mask, pd->src, af)) r = r->skip[3]; else if (!PF_AZERO(&r->dst.mask, af) && !PF_MATCHA(r->dst.not, &r->dst.addr, &r->dst.mask, pd->dst, af)) r = r->skip[5]; else if (r->direction != direction) r = TAILQ_NEXT(r, entries); else { rm = r; if (rm->quick) break; r = TAILQ_NEXT(r, entries); } } if (rm != NULL) { u_short reason; rm->packets++; rm->bytes += pd->tot_len; REASON_SET(&reason, PFRES_MATCH); if (rm->log) PFLOG_PACKET(ifp, h, m, af, direction, reason, rm); if (rm->action != PF_PASS) return (PF_DROP); } return (PF_PASS); } int pf_test_state_tcp(struct pf_state **state, int direction, struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd) { struct pf_tree_key key; struct tcphdr *th = pd->hdr.tcp; u_int16_t win = ntohs(th->th_win); u_int32_t ack, end, seq; int ackskew; struct pf_state_peer *src, *dst; key.af = pd->af; key.proto = IPPROTO_TCP; PF_ACPY(&key.addr[0], pd->src, key.af); PF_ACPY(&key.addr[1], pd->dst, key.af); key.port[0] = th->th_sport; key.port[1] = th->th_dport; if (direction == PF_IN) *state = pf_find_state(tree_ext_gwy, &key); else *state = pf_find_state(tree_lan_ext, &key); if (*state == NULL) return (PF_DROP); if (direction == (*state)->direction) { src = &(*state)->src; dst = &(*state)->dst; } else { src = &(*state)->dst; dst = &(*state)->src; } /* * Sequence tracking algorithm from Guido van Rooij's paper: * http://www.madison-gurkha.com/publications/tcp_filtering/ * tcp_filtering.ps */ seq = ntohl(th->th_seq); if (src->seqlo == 0) { /* First packet from this end. Set its state */ /* Deferred generation of sequence number modulator */ if (dst->seqdiff) { while ((src->seqdiff = arc4random()) == 0) ; ack = ntohl(th->th_ack) - dst->seqdiff; pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + src->seqdiff), 0); pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); } else { ack = ntohl(th->th_ack); } end = seq + pd->p_len; if (th->th_flags & TH_SYN) end++; if (th->th_flags & TH_FIN) end++; src->seqlo = seq; if (src->state < TCPS_SYN_SENT) src->state = TCPS_SYN_SENT; /* * May need to slide the window (seqhi may have been set by * the crappy stack check or if we picked up the connection * after establishment) */ if (SEQ_GEQ(end + MAX(1, dst->max_win), src->seqhi)) src->seqhi = end + MAX(1, dst->max_win); if (win > src->max_win) src->max_win = win; } else { ack = ntohl(th->th_ack) - dst->seqdiff; if (src->seqdiff) { /* Modulate sequence numbers */ pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + src->seqdiff), 0); pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); } end = seq + pd->p_len; if (th->th_flags & TH_SYN) end++; if (th->th_flags & TH_FIN) end++; } if ((th->th_flags & TH_ACK) == 0) { /* Let it pass through the ack skew check */ ack = dst->seqlo; } else if ((ack == 0 && (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || /* broken tcp stacks do not set ack */ (dst->state < TCPS_SYN_SENT)) { /* Many stacks (ours included) will set the ACK number in an * FIN|ACK if the SYN times out -- no sequence to ACK. */ ack = dst->seqlo; } if (seq == end) { /* Ease sequencing restrictions on no data packets */ seq = src->seqlo; end = seq; } ackskew = dst->seqlo - ack; #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ if (SEQ_GEQ(src->seqhi, end) && /* Last octet inside other's window space */ SEQ_GEQ(seq, src->seqlo - dst->max_win) && /* Retrans: not more than one window back */ (ackskew >= -MAXACKWINDOW) && /* Acking not more than one window back */ (ackskew <= MAXACKWINDOW)) { /* Acking not more than one window forward */ (*state)->packets++; (*state)->bytes += pd->tot_len; /* update max window */ if (src->max_win < win) src->max_win = win; /* syncronize sequencing */ if (SEQ_GT(end, src->seqlo)) src->seqlo = end; /* slide the window of what the other end can send */ if (SEQ_GEQ(ack + win, dst->seqhi)) dst->seqhi = ack + MAX(win, 1); /* update states */ if (th->th_flags & TH_SYN) if (src->state < TCPS_SYN_SENT) src->state = TCPS_SYN_SENT; if (th->th_flags & TH_FIN) if (src->state < TCPS_CLOSING) src->state = TCPS_CLOSING; if (th->th_flags & TH_ACK) { if (dst->state == TCPS_SYN_SENT) dst->state = TCPS_ESTABLISHED; else if (dst->state == TCPS_CLOSING) dst->state = TCPS_FIN_WAIT_2; } if (th->th_flags & TH_RST) src->state = dst->state = TCPS_TIME_WAIT; /* update expire time */ if (src->state >= TCPS_FIN_WAIT_2 && dst->state >= TCPS_FIN_WAIT_2) (*state)->expire = pftv.tv_sec + pftm_tcp_closed; else if (src->state >= TCPS_FIN_WAIT_2 || dst->state >= TCPS_FIN_WAIT_2) (*state)->expire = pftv.tv_sec + pftm_tcp_fin_wait; else if (src->state >= TCPS_CLOSING || dst->state >= TCPS_CLOSING) (*state)->expire = pftv.tv_sec + pftm_tcp_closing; else if (src->state < TCPS_ESTABLISHED || dst->state < TCPS_ESTABLISHED) (*state)->expire = pftv.tv_sec + pftm_tcp_opening; else (*state)->expire = pftv.tv_sec + pftm_tcp_established; /* Fall through to PASS packet */ } else if ((dst->state < TCPS_SYN_SENT || dst->state >= TCPS_FIN_WAIT_2 || src->state >= TCPS_FIN_WAIT_2) && SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && /* Within a window forward of the originating packet */ SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { /* Within a window backward of the originating packet */ /* * This currently handles three situations: * 1) Stupid stacks will shotgun SYNs before their peer * replies. * 2) When PF catches an already established stream (the * firewall rebooted, the state table was flushed, routes * changed...) * 3) Packets get funky immediately after the connection * closes (this should catch Solaris spurious ACK|FINs * that web servers like to spew after a close) * * This must be a little more careful than the above code * since packet floods will also be caught here. We don't * update the TTL here to mitigate the damage of a packet * flood and so the same code can handle awkward establishment * and a loosened connection close. * In the establishment case, a correct peer response will * validate the connection, go through the normal state code * and keep updating the state TTL. */ if (pf_status.debug >= PF_DEBUG_MISC) { printf("pf: loose state match: "); pf_print_state(*state); pf_print_flags(th->th_flags); printf(" seq=%lu ack=%lu len=%u ackskew=%d pkts=%d\n", seq, ack, pd->p_len, ackskew, (*state)->packets); } (*state)->packets++; (*state)->bytes += pd->tot_len; /* update max window */ if (src->max_win < win) src->max_win = win; /* syncronize sequencing */ if (SEQ_GT(end, src->seqlo)) src->seqlo = end; /* slide the window of what the other end can send */ if (SEQ_GEQ(ack + win, dst->seqhi)) dst->seqhi = ack + MAX(win, 1); /* * Cannot set dst->seqhi here since this could be a shotgunned * SYN and not an already established connection. */ if (th->th_flags & TH_FIN) if (src->state < TCPS_CLOSING) src->state = TCPS_CLOSING; if (th->th_flags & TH_RST) src->state = dst->state = TCPS_TIME_WAIT; /* Fall through to PASS packet */ } else { if (pf_status.debug >= PF_DEBUG_MISC) { printf("pf: BAD state: "); pf_print_state(*state); pf_print_flags(th->th_flags); printf(" seq=%lu ack=%lu len=%u ackskew=%d pkts=%d " "dir=%s,%s\n", seq, ack, pd->p_len, ackskew, ++(*state)->packets, direction == PF_IN ? "in" : "out", direction == (*state)->direction ? "fwd" : "rev"); printf("pf: State failure on: %c %c %c %c | %c %c\n", SEQ_GEQ(src->seqhi, end) ? ' ' : '1', SEQ_GEQ(seq, src->seqlo - dst->max_win) ? ' ': '2', (ackskew >= -MAXACKWINDOW) ? ' ' : '3', (ackskew <= MAXACKWINDOW) ? ' ' : '4', SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); } return (PF_DROP); } /* Any packets which have gotten here are to be passed */ /* translate source/destination address, if needed */ if (STATE_TRANSLATE(*state)) { if (direction == PF_OUT) pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, &th->th_sum, &(*state)->gwy.addr, (*state)->gwy.port, 0, pd->af); else pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, &th->th_sum, &(*state)->lan.addr, (*state)->lan.port, 0, pd->af); m_copyback(m, off, sizeof(*th), (caddr_t)th); } else if (src->seqdiff) { /* Copyback sequence modulation */ m_copyback(m, off, sizeof(*th), (caddr_t)th); } if ((*state)->rule != NULL) { (*state)->rule->packets++; (*state)->rule->bytes += pd->tot_len; } return (PF_PASS); } int pf_test_state_udp(struct pf_state **state, int direction, struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd) { struct pf_state_peer *src, *dst; struct pf_tree_key key; struct udphdr *uh = pd->hdr.udp; key.af = pd->af; key.proto = IPPROTO_UDP; PF_ACPY(&key.addr[0], pd->src, key.af); PF_ACPY(&key.addr[1], pd->dst, key.af); key.port[0] = pd->hdr.udp->uh_sport; key.port[1] = pd->hdr.udp->uh_dport; if (direction == PF_IN) *state = pf_find_state(tree_ext_gwy, &key); else *state = pf_find_state(tree_lan_ext, &key); if (*state == NULL) return (PF_DROP); if (direction == (*state)->direction) { src = &(*state)->src; dst = &(*state)->dst; } else { src = &(*state)->dst; dst = &(*state)->src; } (*state)->packets++; (*state)->bytes += pd->tot_len; /* update states */ if (src->state < 1) src->state = 1; if (dst->state == 1) dst->state = 2; /* update expire time */ if (src->state == 2 && dst->state == 2) (*state)->expire = pftv.tv_sec + pftm_udp_multiple; else (*state)->expire = pftv.tv_sec + pftm_udp_single; /* translate source/destination address, if necessary */ if (STATE_TRANSLATE(*state)) { if (direction == PF_OUT) pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, &uh->uh_sum, &(*state)->gwy.addr, (*state)->gwy.port, 1, pd->af); else pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, &uh->uh_sum, &(*state)->lan.addr, (*state)->lan.port, 1, pd->af); m_copyback(m, off, sizeof(*uh), (caddr_t)uh); } if ((*state)->rule != NULL) { (*state)->rule->packets++; (*state)->rule->bytes += pd->tot_len; } return (PF_PASS); } int pf_test_state_icmp(struct pf_state **state, int direction, struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd) { struct pf_addr *saddr = pd->src, *daddr = pd->dst; u_int16_t icmpid, *icmpsum; u_int8_t icmptype; int state_icmp = 0; switch (pd->proto) { #ifdef INET case IPPROTO_ICMP: icmptype = pd->hdr.icmp->icmp_type; 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; icmpid = pd->hdr.icmp6->icmp6_id; 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) { /* * ICMP query/reply message not related to a TCP/UDP packet. * Search for an ICMP state. */ struct pf_tree_key key; int rewrite = 0; key.af = pd->af; key.proto = pd->proto; PF_ACPY(&key.addr[0], saddr, key.af); PF_ACPY(&key.addr[1], daddr, key.af); key.port[0] = icmpid; key.port[1] = icmpid; if (direction == PF_IN) *state = pf_find_state(tree_ext_gwy, &key); else *state = pf_find_state(tree_lan_ext, &key); if (*state == NULL) return (PF_DROP); (*state)->packets++; (*state)->bytes += pd->tot_len; (*state)->expire = pftv.tv_sec + pftm_icmp_error_reply; /* translate source/destination address, if needed */ if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) { if (direction == PF_OUT) { switch (pd->af) { #ifdef INET case AF_INET: pf_change_a(&saddr->v4.s_addr, pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, &(*state)->gwy.addr, 0); rewrite++; break; #endif /* INET6 */ } } else { switch (pd->af) { #ifdef INET case AF_INET: pf_change_a(&daddr->v4.s_addr, pd->ip_sum, (*state)->lan.addr.v4.s_addr, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, &(*state)->lan.addr, 0); rewrite++; break; #endif /* INET6 */ } } } /* copy back packet headers if we performed IPv6 NAT */ if (rewrite) m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp6); return (PF_PASS); } else { /* * ICMP error message in response to a TCP/UDP packet. * Extract the inner TCP/UDP header and search for that state. */ struct pf_pdesc pd2; #ifdef INET struct ip h2; #endif /* INET */ #ifdef INET6 struct ip6_hdr h2_6; int terminal = 0; #endif /* INET6 */ int ipoff2; int off2; pd2.af = pd->af; switch (pd->af) { #ifdef INET case AF_INET: /* offset of h2 in mbuf chain */ ipoff2 = off + ICMP_MINLEN; if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), NULL, NULL, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short (ip)\n")); return (PF_DROP); } /* ICMP error messages don't refer to non-first fragments */ if (h2.ip_off & IP_OFFMASK) return (PF_DROP); /* offset of protocol header that follows h2 */ off2 = ipoff2 + (h2.ip_hl << 2); pd2.proto = h2.ip_p; pd2.src = (struct pf_addr *)&h2.ip_src; pd2.dst = (struct pf_addr *)&h2.ip_dst; pd2.ip_sum = &h2.ip_sum; break; #endif /* INET */ #ifdef INET6 case AF_INET6: ipoff2 = off + sizeof(struct icmp6_hdr); if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), NULL, NULL, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short (ip6)\n")); return (PF_DROP); } pd2.proto = h2_6.ip6_nxt; pd2.src = (struct pf_addr *)&h2_6.ip6_src; pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; pd2.ip_sum = NULL; do { while (off >= m->m_len) { off -= m->m_len; m = m->m_next; } switch (pd2.proto) { case IPPROTO_FRAGMENT: /* XXX we don't handle fagments yet */ return (PF_DROP); case IPPROTO_AH: case IPPROTO_HOPOPTS: case IPPROTO_ROUTING: case IPPROTO_DSTOPTS: { /* get next header and header length */ struct _opt6 *opt6; opt6 = (struct _opt6 *)(mtod(m, caddr_t) + off2); pd2.proto = opt6->opt6_nxt; off2 += (opt6->opt6_hlen + 1) * 8; /* goto the next header */ break; } default: terminal++; break; } } while (!terminal); break; #endif /* INET6 */ } switch (pd2.proto) { case IPPROTO_TCP: { struct tcphdr th; u_int32_t seq; struct pf_tree_key key; struct pf_state_peer *src, *dst; /* * Only the first 8 bytes of the TCP header can be * expected. Don't access any TCP header fields after * th_seq, an ackskew test is not possible. */ if (!pf_pull_hdr(m, off2, &th, 8, NULL, NULL, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short (tcp)\n")); return (PF_DROP); } key.af = pd2.af; key.proto = IPPROTO_TCP; PF_ACPY(&key.addr[0], pd2.dst, pd2.af); key.port[0] = th.th_dport; PF_ACPY(&key.addr[1], pd2.src, pd2.af); key.port[1] = th.th_sport; if (direction == PF_IN) *state = pf_find_state(tree_ext_gwy, &key); else *state = pf_find_state(tree_lan_ext, &key); if (*state == NULL) return (PF_DROP); if (direction == (*state)->direction) { src = &(*state)->dst; dst = &(*state)->src; } else { src = &(*state)->src; dst = &(*state)->dst; } /* Demodulate sequence number */ seq = ntohl(th.th_seq) - src->seqdiff; if (src->seqdiff) pf_change_a(&th.th_seq, &th.th_sum, htonl(seq), 0); if (!SEQ_GEQ(src->seqhi, seq) || !SEQ_GEQ(seq, src->seqlo - dst->max_win)) { if (pf_status.debug >= PF_DEBUG_MISC) { printf("pf: BAD ICMP state: "); pf_print_state(*state); printf(" seq=%lu\n", seq); } return (PF_DROP); } if (STATE_TRANSLATE(*state)) { if (direction == PF_IN) { pf_change_icmp(pd2.src, &th.th_sport, saddr, &(*state)->lan.addr, (*state)->lan.port, NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, pd2.af); } else { pf_change_icmp(pd2.dst, &th.th_dport, saddr, &(*state)->gwy.addr, (*state)->gwy.port, NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, pd2.af); } switch (pd2.af) { #ifdef INET case AF_INET: m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); break; #endif /* INET */ #ifdef INET6 case AF_INET6: m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp6); m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); break; #endif /* INET6 */ } m_copyback(m, off2, 8, (caddr_t)&th); } else if (src->seqdiff) { m_copyback(m, off2, 8, (caddr_t)&th); } return (PF_PASS); break; } case IPPROTO_UDP: { struct udphdr uh; struct pf_tree_key key; if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), NULL, NULL, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short (udp)\n")); return (PF_DROP); } key.af = pd2.af; key.proto = IPPROTO_UDP; PF_ACPY(&key.addr[0], pd2.dst, pd2.af); key.port[0] = uh.uh_dport; PF_ACPY(&key.addr[1], pd2.src, pd2.af); key.port[1] = uh.uh_sport; if (direction == PF_IN) *state = pf_find_state(tree_ext_gwy, &key); else *state = pf_find_state(tree_lan_ext, &key); if (*state == NULL) return (PF_DROP); if (STATE_TRANSLATE(*state)) { if (direction == PF_IN) { pf_change_icmp(pd2.src, &uh.uh_sport, daddr, &(*state)->lan.addr, (*state)->lan.port, &uh.uh_sum, pd2.ip_sum, icmpsum, pd->ip_sum, 1, pd2.af); } else { pf_change_icmp(pd2.dst, &uh.uh_dport, saddr, &(*state)->gwy.addr, (*state)->gwy.port, &uh.uh_sum, pd2.ip_sum, icmpsum, pd->ip_sum, 1, pd2.af); } switch (pd2.af) { #ifdef INET case AF_INET: m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2); break; #endif /* INET */ #ifdef INET6 case AF_INET6: m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp6); m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); break; #endif /* INET6 */ } m_copyback(m, off2, sizeof(uh), (caddr_t)&uh); } return (PF_PASS); break; } #ifdef INET case IPPROTO_ICMP: { struct icmp iih; struct pf_tree_key key; if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, NULL, NULL, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short (icmp)\n")); return (PF_DROP); } key.af = pd2.af; key.proto = IPPROTO_ICMP; PF_ACPY(&key.addr[0], pd2.dst, pd2.af); key.port[0] = iih.icmp_id; PF_ACPY(&key.addr[1], pd2.src, pd2.af); key.port[1] = iih.icmp_id; if (direction == PF_IN) *state = pf_find_state(tree_ext_gwy, &key); else *state = pf_find_state(tree_lan_ext, &key); if (*state == NULL) return (PF_DROP); if (STATE_TRANSLATE(*state)) { if (direction == PF_IN) { pf_change_icmp(pd2.src, &iih.icmp_id, daddr, &(*state)->lan.addr, (*state)->lan.port, NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET); } else { pf_change_icmp(pd2.dst, &iih.icmp_id, saddr, &(*state)->gwy.addr, (*state)->gwy.port, 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); m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); } return (PF_PASS); break; } #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: { struct icmp6_hdr iih; struct pf_tree_key key; if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, NULL, NULL, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short (icmp6)\n")); return (PF_DROP); } key.af = pd2.af; key.proto = IPPROTO_ICMPV6; PF_ACPY(&key.addr[0], pd2.dst, pd2.af); key.port[0] = iih.icmp6_id; PF_ACPY(&key.addr[1], pd2.src, pd2.af); key.port[1] = iih.icmp6_id; if (direction == PF_IN) *state = pf_find_state(tree_ext_gwy, &key); else *state = pf_find_state(tree_lan_ext, &key); if (*state == NULL) return (PF_DROP); if (STATE_TRANSLATE(*state)) { if (direction == PF_IN) { pf_change_icmp(pd2.src, &iih.icmp6_id, daddr, &(*state)->lan.addr, (*state)->lan.port, NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET6); } else { pf_change_icmp(pd2.dst, &iih.icmp6_id, saddr, &(*state)->gwy.addr, (*state)->gwy.port, NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET6); } m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp6); m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih); } return (PF_PASS); break; } #endif /* INET6 */ default: DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message for bad proto\n")); return (PF_DROP); } } } /* * ipoff and off are measured from the start of the mbuf chain. * h must be at "ipoff" on the mbuf chain. */ void * pf_pull_hdr(struct mbuf *m, int off, void *p, int len, u_short *actionp, u_short *reasonp, int af) { switch (af) { #ifdef INET case AF_INET: { struct ip *h = mtod(m, struct ip *); u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3; if (fragoff) { if (fragoff >= len) ACTION_SET(actionp, PF_PASS); else { ACTION_SET(actionp, PF_DROP); REASON_SET(reasonp, PFRES_FRAG); } return (NULL); } if (m->m_pkthdr.len < off + len || h->ip_len < off + len) { ACTION_SET(actionp, PF_DROP); REASON_SET(reasonp, PFRES_SHORT); return (NULL); } } #endif /* INET */ #ifdef INET6 case AF_INET6: { struct ip6_hdr *h = mtod(m, struct ip6_hdr *); if (m->m_pkthdr.len < off + len || (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < off + len) { ACTION_SET(actionp, PF_DROP); REASON_SET(reasonp, PFRES_SHORT); return (NULL); } } #endif /* INET6 */ } m_copydata(m, off, len, p); return (p); } #ifdef INET int pf_test(int dir, struct ifnet *ifp, struct mbuf **m0) { u_short action, reason = 0, log = 0; struct mbuf *m = *m0; struct ip *h; struct pf_rule *r = NULL; struct pf_state *s = NULL; struct pf_pdesc pd; int off; if (!pf_status.running || (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) return (PF_PASS); #ifdef DIAGNOSTIC if ((m->m_flags & M_PKTHDR) == 0) panic("non-M_PKTHDR is passed to pf_test"); #endif /* purge expire states */ microtime(&pftv); if (pftv.tv_sec - pf_last_purge >= pftm_interval) { pf_purge_expired_states(); pf_purge_expired_fragments(); pf_last_purge = pftv.tv_sec; } if (m->m_pkthdr.len < sizeof(*h)) { action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); log = 1; goto done; } /* We do IP header normalization and packet reassembly here */ if (pf_normalize_ip(m0, dir, ifp, &reason) != PF_PASS) { ACTION_SET(&action, PF_DROP); goto done; } m = *m0; h = mtod(m, struct ip *); off = h->ip_hl << 2; if (off < sizeof(*h)) { action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); log = 1; goto done; } pd.src = (struct pf_addr *)&h->ip_src; pd.dst = (struct pf_addr *)&h->ip_dst; pd.ip_sum = &h->ip_sum; pd.proto = h->ip_p; pd.af = AF_INET; pd.tot_len = h->ip_len; switch (h->ip_p) { case IPPROTO_TCP: { struct tcphdr th; pd.hdr.tcp = &th; if (!pf_pull_hdr(m, off, &th, sizeof(th), &action, &reason, AF_INET)) { log = action != PF_PASS; goto done; } pd.p_len = pd.tot_len - off - (th.th_off << 2); action = pf_normalize_tcp(dir, ifp, m, 0, off, h, &pd); if (action == PF_DROP) break; action = pf_test_state_tcp(&s, dir, ifp, m, 0, off, h, &pd); if (action == PF_PASS) { r = s->rule; log = s->log; } else if (s == NULL) action = pf_test_tcp(dir, ifp, m, 0, off, h, &pd); break; } case IPPROTO_UDP: { struct udphdr uh; pd.hdr.udp = &uh; if (!pf_pull_hdr(m, off, &uh, sizeof(uh), &action, &reason, AF_INET)) { log = action != PF_PASS; goto done; } action = pf_test_state_udp(&s, dir, ifp, m, 0, off, h, &pd); if (action == PF_PASS) { r = s->rule; log = s->log; } else if (s == NULL) action = pf_test_udp(dir, ifp, m, 0, off, h, &pd); break; } case IPPROTO_ICMP: { struct icmp ih; pd.hdr.icmp = &ih; if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, &action, &reason, AF_INET)) { log = action != PF_PASS; goto done; } action = pf_test_state_icmp(&s, dir, ifp, m, 0, off, h, &pd); if (action == PF_PASS) { r = s->rule; if (r != NULL) { r->packets++; r->bytes += h->ip_len; } log = s->log; } else if (s == NULL) action = pf_test_icmp(dir, ifp, m, 0, off, h, &pd); break; } default: action = pf_test_other(dir, ifp, m, h, &pd); break; } if (ifp == status_ifp) { pf_status.bcounters[0][dir] += pd.tot_len; pf_status.pcounters[0][dir][action]++; } done: if (log) { struct pf_rule r0; if (r == NULL) { r0.ifp = ifp; r0.action = action; r0.nr = -1; r = &r0; } PFLOG_PACKET(ifp, h, m, AF_INET, dir, reason, r); } return (action); } #endif /* INET */ #ifdef INET6 int pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0) { u_short action, reason = 0, log = 0; struct mbuf *m = *m0; struct ip6_hdr *h; struct pf_rule *r = NULL; struct pf_state *s = NULL; struct pf_pdesc pd; int off, terminal = 0; if (!pf_status.running || (m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) return (PF_PASS); #ifdef DIAGNOSTIC if ((m->m_flags & M_PKTHDR) == 0) panic("non-M_PKTHDR is passed to pf_test"); #endif /* purge expire states */ microtime(&pftv); if (pftv.tv_sec - pf_last_purge >= pftm_interval) { pf_purge_expired_states(); pf_purge_expired_fragments(); pf_last_purge = pftv.tv_sec; } if (m->m_pkthdr.len < sizeof(*h)) { action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); log = 1; goto done; } m = *m0; h = mtod(m, struct ip6_hdr *); pd.src = (struct pf_addr *)&h->ip6_src; pd.dst = (struct pf_addr *)&h->ip6_dst; pd.ip_sum = NULL; pd.af = AF_INET6; pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); pd.proto = h->ip6_nxt; do { while (off >= m->m_len) { off -= m->m_len; m = m->m_next; } switch (pd.proto) { case IPPROTO_FRAGMENT: /* XXX we don't handle fragments yet */ action = PF_DROP; REASON_SET(&reason, PFRES_FRAG); goto done; case IPPROTO_AH: case IPPROTO_HOPOPTS: case IPPROTO_ROUTING: case IPPROTO_DSTOPTS: { /* get next header and header length */ struct _opt6 *opt6; opt6 = (struct _opt6 *)(mtod(m, caddr_t) + off); pd.proto = opt6->opt6_nxt; off += (opt6->opt6_hlen + 1) * 8; /* goto the next header */ break; } default: terminal++; break; } } while (!terminal); switch (pd.proto) { case IPPROTO_TCP: { struct tcphdr th; pd.hdr.tcp = &th; if (!pf_pull_hdr(m, off, &th, sizeof(th), &action, &reason, AF_INET6)) { log = action != PF_PASS; goto done; } pd.p_len = pd.tot_len - off - (th.th_off << 2); action = pf_normalize_tcp(dir, ifp, m, 0, off, h, &pd); if (action == PF_DROP) break; action = pf_test_state_tcp(&s, dir, ifp, m, 0, off, h, &pd); if (action == PF_PASS) { r = s->rule; log = s->log; } else if (s == NULL) action = pf_test_tcp(dir, ifp, m, 0, off, h, &pd); break; } case IPPROTO_UDP: { struct udphdr uh; pd.hdr.udp = &uh; if (!pf_pull_hdr(m, off, &uh, sizeof(uh), &action, &reason, AF_INET6)) { log = action != PF_PASS; goto done; } action = pf_test_state_udp(&s, dir, ifp, m, 0, off, h, &pd); if (action == PF_PASS) { r = s->rule; log = s->log; } else if (s == NULL) action = pf_test_udp(dir, ifp, m, 0, off, h, &pd); break; } case IPPROTO_ICMPV6: { struct icmp6_hdr ih; pd.hdr.icmp6 = &ih; if (!pf_pull_hdr(m, off, &ih, sizeof(ih), &action, &reason, AF_INET6)) { log = action != PF_PASS; goto done; } action = pf_test_state_icmp(&s, dir, ifp, m, 0, off, h, &pd); if (action == PF_PASS) { r = s->rule; if (r != NULL) { r->packets++; r->bytes += h->ip6_plen; } log = s->log; } else if (s == NULL) action = pf_test_icmp(dir, ifp, m, 0, off, h, &pd); break; } default: action = pf_test_other(dir, ifp, m, h, &pd); break; } if (ifp == status_ifp) { pf_status.bcounters[1][dir] += h->ip6_plen; pf_status.pcounters[1][dir][action]++; } done: if (log) { struct pf_rule r0; if (r == NULL) { r0.ifp = ifp; r0.action = action; r0.nr = -1; r = &r0; } PFLOG_PACKET(ifp, h, m, AF_INET6, dir, reason, r); } return (action); } #endif /* INET6 */