Index: projects/pf/head/sys/contrib/pf/net/pf.c =================================================================== --- projects/pf/head/sys/contrib/pf/net/pf.c (revision 232604) +++ projects/pf/head/sys/contrib/pf/net/pf.c (revision 232605) @@ -1,6115 +1,6115 @@ /* $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $ */ /* * Copyright (c) 2001 Daniel Hartmeier * Copyright (c) 2002 - 2008 Henning Brauer * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * Effort sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F30602-01-2-0537. * */ #include "opt_inet.h" #include "opt_inet6.h" #include __FBSDID("$FreeBSD$"); #include "opt_bpf.h" #include "opt_pf.h" #ifdef DEV_PFLOW #define NPFLOW DEV_PFLOW #else #define NPFLOW 0 #endif #include #include #include #include #include #include #include #include #include #include #include #define betoh64 be64toh #include #include #include #include #include #include #include #include #include #ifdef RADIX_MPATH #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* XXX: only for DIR_IN/DIR_OUT */ #include #include #include #include #ifdef INET6 #include #include #include #include #include #include #endif /* INET6 */ #include #include #include #include extern int ip_optcopy(struct ip *, struct ip *); #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x /* * Global variables */ /* state tables */ VNET_DEFINE(struct pf_state_tree, pf_statetbl); VNET_DEFINE(struct pf_altqqueue, pf_altqs[2]); VNET_DEFINE(struct pf_palist, pf_pabuf); VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active); VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive); VNET_DEFINE(struct pf_status, pf_status); VNET_DEFINE(u_int32_t, ticket_altqs_active); VNET_DEFINE(u_int32_t, ticket_altqs_inactive); VNET_DEFINE(int, altqs_inactive_open); VNET_DEFINE(u_int32_t, ticket_pabuf); VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx); #define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx) VNET_DEFINE(u_char, pf_tcp_secret[16]); #define V_pf_tcp_secret VNET(pf_tcp_secret) VNET_DEFINE(int, pf_tcp_secret_init); #define V_pf_tcp_secret_init VNET(pf_tcp_secret_init) VNET_DEFINE(int, pf_tcp_iss_off); #define V_pf_tcp_iss_off VNET(pf_tcp_iss_off) struct pf_anchor_stackframe { struct pf_ruleset *rs; struct pf_rule *r; struct pf_anchor_node *parent; struct pf_anchor *child; }; VNET_DEFINE(struct pf_anchor_stackframe, pf_anchor_stack[64]); #define V_pf_anchor_stack VNET(pf_anchor_stack) VNET_DEFINE(uma_zone_t, pf_src_tree_z); VNET_DEFINE(uma_zone_t, pf_rule_z); VNET_DEFINE(uma_zone_t, pf_pooladdr_z); VNET_DEFINE(uma_zone_t, pf_state_z); VNET_DEFINE(uma_zone_t, pf_state_key_z); VNET_DEFINE(uma_zone_t, pf_altq_z); static void pf_src_tree_remove_state(struct pf_state *); static void pf_init_threshold(struct pf_threshold *, u_int32_t, u_int32_t); static void pf_add_threshold(struct pf_threshold *); static int pf_check_threshold(struct pf_threshold *); static 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, sa_family_t); static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, struct tcphdr *, struct pf_state_peer *); #ifdef INET6 static void pf_change_a6(struct pf_addr *, u_int16_t *, struct pf_addr *, u_int8_t); #endif /* INET6 */ static void pf_change_icmp(struct pf_addr *, u_int16_t *, struct pf_addr *, struct pf_addr *, u_int16_t, u_int16_t *, u_int16_t *, u_int16_t *, u_int16_t *, u_int8_t, sa_family_t); static void pf_send_tcp(struct mbuf *, const struct pf_rule *, sa_family_t, const struct pf_addr *, const struct pf_addr *, u_int16_t, u_int16_t, u_int32_t, u_int32_t, u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, u_int16_t, struct ether_header *, struct ifnet *); static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, sa_family_t, struct pf_rule *); static void pf_detach_state(struct pf_state *); static int pf_state_key_attach(struct pf_state_key *, struct pf_state *, int); static void pf_state_key_detach(struct pf_state *, int); static u_int32_t pf_tcp_iss(struct pf_pdesc *); static int pf_test_rule(struct pf_rule **, struct pf_state **, int, struct pfi_kif *, struct mbuf *, int, void *, struct pf_pdesc *, struct pf_rule **, struct pf_ruleset **, struct ifqueue *, struct inpcb *); static __inline int pf_create_state(struct pf_rule *, struct pf_rule *, struct pf_rule *, struct pf_pdesc *, struct pf_src_node *, struct pf_state_key *, struct pf_state_key *, struct pf_state_key *, struct pf_state_key *, struct mbuf *, int, u_int16_t, u_int16_t, int *, struct pfi_kif *, struct pf_state **, int, u_int16_t, u_int16_t, int); static int pf_test_fragment(struct pf_rule **, int, struct pfi_kif *, struct mbuf *, void *, struct pf_pdesc *, struct pf_rule **, struct pf_ruleset **); static int pf_tcp_track_full(struct pf_state_peer *, struct pf_state_peer *, struct pf_state **, struct pfi_kif *, struct mbuf *, int, struct pf_pdesc *, u_short *, int *); static int pf_tcp_track_sloppy(struct pf_state_peer *, struct pf_state_peer *, struct pf_state **, struct pf_pdesc *, u_short *); static int pf_test_state_tcp(struct pf_state **, int, struct pfi_kif *, struct mbuf *, int, void *, struct pf_pdesc *, u_short *); static int pf_test_state_udp(struct pf_state **, int, struct pfi_kif *, struct mbuf *, int, void *, struct pf_pdesc *); static int pf_test_state_icmp(struct pf_state **, int, struct pfi_kif *, struct mbuf *, int, void *, struct pf_pdesc *, u_short *); static int pf_test_state_other(struct pf_state **, int, struct pfi_kif *, struct mbuf *, struct pf_pdesc *); static void pf_route(struct mbuf **, struct pf_rule *, int, struct ifnet *, struct pf_state *, struct pf_pdesc *); static void pf_route6(struct mbuf **, struct pf_rule *, int, struct ifnet *, struct pf_state *, struct pf_pdesc *); static int pf_socket_lookup(int, struct pf_pdesc *, struct inpcb *); static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, sa_family_t); static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, sa_family_t); static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, int, u_int16_t); static void pf_set_rt_ifp(struct pf_state *, struct pf_addr *); static int pf_check_proto_cksum(struct mbuf *, int, int, u_int8_t, sa_family_t); static void pf_print_state_parts(struct pf_state *, struct pf_state_key *, struct pf_state_key *); static int pf_addr_wrap_neq(struct pf_addr_wrap *, struct pf_addr_wrap *); static int pf_compare_state_keys(struct pf_state_key *, struct pf_state_key *, struct pfi_kif *, u_int); static struct pf_state *pf_find_state(struct pfi_kif *, struct pf_state_key_cmp *, u_int, struct mbuf *, struct pf_mtag *); static int pf_src_connlimit(struct pf_state **); static int pf_insert_src_node(struct pf_src_node **, struct pf_rule *, struct pf_addr *, sa_family_t); static int pf_check_congestion(struct ifqueue *); static int pf_purge_expired_states(u_int32_t , int); int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); VNET_DECLARE(int, pf_end_threads); VNET_DEFINE(struct pf_pool_limit, pf_pool_limits[PF_LIMIT_MAX]); #define PPACKET_LOOPED() \ (pd->pf_mtag->flags & PF_PACKET_LOOPED) #define PACKET_LOOPED() \ (pd.pf_mtag->flags & PF_PACKET_LOOPED) #define STATE_LOOKUP(i, k, d, s, m, pt) \ do { \ s = pf_find_state(i, k, d, m, pt); \ if (s == NULL || (s)->timeout == PFTM_PURGE) \ return (PF_DROP); \ if (PPACKET_LOOPED()) \ return (PF_PASS); \ if (d == PF_OUT && \ (((s)->rule.ptr->rt == PF_ROUTETO && \ (s)->rule.ptr->direction == PF_OUT) || \ ((s)->rule.ptr->rt == PF_REPLYTO && \ (s)->rule.ptr->direction == PF_IN)) && \ (s)->rt_kif != NULL && \ (s)->rt_kif != i) \ return (PF_PASS); \ } while (0) #define BOUND_IFACE(r, k) \ ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all #define STATE_INC_COUNTERS(s) \ do { \ s->rule.ptr->states_cur++; \ s->rule.ptr->states_tot++; \ if (s->anchor.ptr != NULL) { \ s->anchor.ptr->states_cur++; \ s->anchor.ptr->states_tot++; \ } \ if (s->nat_rule.ptr != NULL) { \ s->nat_rule.ptr->states_cur++; \ s->nat_rule.ptr->states_tot++; \ } \ } while (0) #define STATE_DEC_COUNTERS(s) \ do { \ if (s->nat_rule.ptr != NULL) \ s->nat_rule.ptr->states_cur--; \ if (s->anchor.ptr != NULL) \ s->anchor.ptr->states_cur--; \ s->rule.ptr->states_cur--; \ } while (0) static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *); static __inline int pf_state_compare_key(struct pf_state_key *, struct pf_state_key *); static __inline int pf_state_compare_id(struct pf_state *, struct pf_state *); VNET_DEFINE(struct pf_src_tree, tree_src_tracking); VNET_DEFINE(struct pf_state_tree_id, tree_id); VNET_DEFINE(struct pf_state_queue, state_list); RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key); RB_GENERATE(pf_state_tree_id, pf_state, entry_id, pf_state_compare_id); static __inline int pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) { int diff; if (a->rule.ptr > b->rule.ptr) return (1); if (a->rule.ptr < b->rule.ptr) return (-1); if ((diff = a->af - b->af) != 0) return (diff); switch (a->af) { #ifdef INET case AF_INET: if (a->addr.addr32[0] > b->addr.addr32[0]) return (1); if (a->addr.addr32[0] < b->addr.addr32[0]) return (-1); break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (a->addr.addr32[3] > b->addr.addr32[3]) return (1); if (a->addr.addr32[3] < b->addr.addr32[3]) return (-1); if (a->addr.addr32[2] > b->addr.addr32[2]) return (1); if (a->addr.addr32[2] < b->addr.addr32[2]) return (-1); if (a->addr.addr32[1] > b->addr.addr32[1]) return (1); if (a->addr.addr32[1] < b->addr.addr32[1]) return (-1); if (a->addr.addr32[0] > b->addr.addr32[0]) return (1); if (a->addr.addr32[0] < b->addr.addr32[0]) return (-1); break; #endif /* INET6 */ } return (0); } #ifdef INET6 void pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_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 /* INET6 */ static void pf_init_threshold(struct pf_threshold *threshold, u_int32_t limit, u_int32_t seconds) { threshold->limit = limit * PF_THRESHOLD_MULT; threshold->seconds = seconds; threshold->count = 0; threshold->last = time_second; } static void pf_add_threshold(struct pf_threshold *threshold) { u_int32_t t = time_second, diff = t - threshold->last; if (diff >= threshold->seconds) threshold->count = 0; else threshold->count -= threshold->count * diff / threshold->seconds; threshold->count += PF_THRESHOLD_MULT; threshold->last = t; } static int pf_check_threshold(struct pf_threshold *threshold) { return (threshold->count > threshold->limit); } static int pf_src_connlimit(struct pf_state **state) { int bad = 0; (*state)->src_node->conn++; (*state)->src.tcp_est = 1; pf_add_threshold(&(*state)->src_node->conn_rate); if ((*state)->rule.ptr->max_src_conn && (*state)->rule.ptr->max_src_conn < (*state)->src_node->conn) { V_pf_status.lcounters[LCNT_SRCCONN]++; bad++; } if ((*state)->rule.ptr->max_src_conn_rate.limit && pf_check_threshold(&(*state)->src_node->conn_rate)) { V_pf_status.lcounters[LCNT_SRCCONNRATE]++; bad++; } if (!bad) return (0); if ((*state)->rule.ptr->overload_tbl) { struct pfr_addr p; u_int32_t killed = 0; V_pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf_src_connlimit: blocking address "); pf_print_host(&(*state)->src_node->addr, 0, (*state)->key[PF_SK_WIRE]->af); } bzero(&p, sizeof(p)); p.pfra_af = (*state)->key[PF_SK_WIRE]->af; switch ((*state)->key[PF_SK_WIRE]->af) { #ifdef INET case AF_INET: p.pfra_net = 32; p.pfra_ip4addr = (*state)->src_node->addr.v4; break; #endif /* INET */ #ifdef INET6 case AF_INET6: p.pfra_net = 128; p.pfra_ip6addr = (*state)->src_node->addr.v6; break; #endif /* INET6 */ } pfr_insert_kentry((*state)->rule.ptr->overload_tbl, &p, time_second); /* kill existing states if that's required. */ if ((*state)->rule.ptr->flush) { struct pf_state_key *sk; struct pf_state *st; V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; PF_IDS_LOCK(); /* XXXGL: this cycle should go into a separate taskq */ RB_FOREACH(st, pf_state_tree_id, &V_tree_id) { sk = st->key[PF_SK_WIRE]; /* * Kill states from this source. (Only those * from the same rule if PF_FLUSH_GLOBAL is not * set) */ if (sk->af == (*state)->key[PF_SK_WIRE]->af && (((*state)->direction == PF_OUT && PF_AEQ(&(*state)->src_node->addr, &sk->addr[0], sk->af)) || ((*state)->direction == PF_IN && PF_AEQ(&(*state)->src_node->addr, &sk->addr[1], sk->af))) && ((*state)->rule.ptr->flush & PF_FLUSH_GLOBAL || (*state)->rule.ptr == st->rule.ptr)) { st->timeout = PFTM_PURGE; st->src.state = st->dst.state = TCPS_CLOSED; killed++; } } PF_IDS_UNLOCK(); if (V_pf_status.debug >= PF_DEBUG_MISC) printf(", %u states killed", killed); } if (V_pf_status.debug >= PF_DEBUG_MISC) printf("\n"); } /* kill this state */ (*state)->timeout = PFTM_PURGE; (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; return (1); } static int pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, struct pf_addr *src, sa_family_t af) { struct pf_src_node k; if (*sn == NULL) { k.af = af; PF_ACPY(&k.addr, src, af); if (rule->rule_flag & PFRULE_RULESRCTRACK || rule->rpool.opts & PF_POOL_STICKYADDR) k.rule.ptr = rule; else k.rule.ptr = NULL; V_pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; *sn = RB_FIND(pf_src_tree, &V_tree_src_tracking, &k); } if (*sn == NULL) { if (!rule->max_src_nodes || rule->src_nodes < rule->max_src_nodes) (*sn) = uma_zalloc(V_pf_src_tree_z, M_NOWAIT | M_ZERO); else V_pf_status.lcounters[LCNT_SRCNODES]++; if ((*sn) == NULL) return (-1); pf_init_threshold(&(*sn)->conn_rate, rule->max_src_conn_rate.limit, rule->max_src_conn_rate.seconds); (*sn)->af = af; if (rule->rule_flag & PFRULE_RULESRCTRACK || rule->rpool.opts & PF_POOL_STICKYADDR) (*sn)->rule.ptr = rule; else (*sn)->rule.ptr = NULL; PF_ACPY(&(*sn)->addr, src, af); if (RB_INSERT(pf_src_tree, &V_tree_src_tracking, *sn) != NULL) { if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: src_tree insert failed: "); pf_print_host(&(*sn)->addr, 0, af); printf("\n"); } uma_zfree(V_pf_src_tree_z, *sn); return (-1); } (*sn)->creation = time_second; (*sn)->ruletype = rule->action; if ((*sn)->rule.ptr != NULL) (*sn)->rule.ptr->src_nodes++; V_pf_status.scounters[SCNT_SRC_NODE_INSERT]++; V_pf_status.src_nodes++; } else { if (rule->max_src_states && (*sn)->states >= rule->max_src_states) { V_pf_status.lcounters[LCNT_SRCSTATES]++; return (-1); } } return (0); } /* state table stuff */ static __inline int pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b) { int diff; 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[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[3] > b->addr[1].addr32[3]) return (1); if (a->addr[1].addr32[3] < b->addr[1].addr32[3]) 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[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[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[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[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 /* 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); } static __inline int pf_state_compare_id(struct pf_state *a, struct pf_state *b) { if (a->id > b->id) return (1); if (a->id < b->id) return (-1); if (a->creatorid > b->creatorid) return (1); if (a->creatorid < b->creatorid) return (-1); return (0); } static int pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx) { struct pf_state_key *cur; struct pf_state *si, *olds = NULL; PF_KEYS_ASSERT(); KASSERT(s->key[idx] == NULL, ("%s: a key already attached", __func__)); if ((cur = RB_INSERT(pf_state_tree, &V_pf_statetbl, sk)) != NULL) { /* key exists. check for same kif, if none, add to key */ TAILQ_FOREACH(si, &cur->states, key_list) if (si->kif == s->kif && si->direction == s->direction) { if (sk->proto == IPPROTO_TCP && si->src.state >= TCPS_FIN_WAIT_2 && si->dst.state >= TCPS_FIN_WAIT_2) { si->src.state = si->dst.state = TCPS_CLOSED; /* unlink late or sks can go away */ olds = si; } else { if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: %s key attach " "failed on %s: ", (idx == PF_SK_WIRE) ? "wire" : "stack", s->kif->pfik_name); pf_print_state_parts(s, (idx == PF_SK_WIRE) ? sk : NULL, (idx == PF_SK_STACK) ? sk : NULL); printf(", existing: "); pf_print_state_parts(si, (idx == PF_SK_WIRE) ? sk : NULL, (idx == PF_SK_STACK) ? sk : NULL); printf("\n"); } uma_zfree(V_pf_state_key_z, sk); return (-1); /* collision! */ } } uma_zfree(V_pf_state_key_z, sk); s->key[idx] = cur; } else s->key[idx] = sk; /* list is sorted, if-bound states before floating */ if (s->kif == V_pfi_all) TAILQ_INSERT_TAIL(&s->key[idx]->states, s, key_list); else TAILQ_INSERT_HEAD(&s->key[idx]->states, s, key_list); if (olds) pf_unlink_state(olds, 0); return (0); } static void pf_detach_state(struct pf_state *s) { PF_KEYS_ASSERT(); if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK]) s->key[PF_SK_WIRE] = NULL; if (s->key[PF_SK_STACK] != NULL) pf_state_key_detach(s, PF_SK_STACK); if (s->key[PF_SK_WIRE] != NULL) pf_state_key_detach(s, PF_SK_WIRE); } static void pf_state_key_detach(struct pf_state *s, int idx) { struct pf_state *si; PF_KEYS_ASSERT(); si = TAILQ_FIRST(&s->key[idx]->states); while (si && si != s) si = TAILQ_NEXT(si, key_list); if (si) TAILQ_REMOVE(&s->key[idx]->states, si, key_list); if (TAILQ_EMPTY(&s->key[idx]->states)) { RB_REMOVE(pf_state_tree, &V_pf_statetbl, s->key[idx]); if (s->key[idx]->reverse) s->key[idx]->reverse->reverse = NULL; uma_zfree(V_pf_state_key_z, s->key[idx]); } s->key[idx] = NULL; } int pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr, struct pf_state_key **skw, struct pf_state_key **sks, struct pf_state_key **skp, struct pf_state_key **nkp, struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t sport, u_int16_t dport) { KASSERT((*skp == NULL && *nkp == NULL), ("%s: skp == NULL && nkp == NULL", __func__)); - if ((*skp = uma_zalloc(V_pf_state_key_z, M_NOWAIT | M_ZERO)) == NULL) + if ((*skp = uma_zalloc(V_pf_state_key_z, M_NOWAIT)) == NULL) return (ENOMEM); PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af); PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af); (*skp)->port[pd->sidx] = sport; (*skp)->port[pd->didx] = dport; (*skp)->proto = pd->proto; (*skp)->af = pd->af; if (nr != NULL) { - if ((*nkp = uma_zalloc(V_pf_state_key_z, M_NOWAIT | M_ZERO)) + if ((*nkp = uma_zalloc(V_pf_state_key_z, M_NOWAIT)) == NULL) return (ENOMEM); /* caller must handle cleanup */ /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */ PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af); PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af); (*nkp)->port[0] = (*skp)->port[0]; (*nkp)->port[1] = (*skp)->port[1]; (*nkp)->proto = pd->proto; (*nkp)->af = pd->af; } else *nkp = *skp; if (pd->dir == PF_IN) { *skw = *skp; *sks = *nkp; } else { *sks = *skp; *skw = *nkp; } return (0); } int pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw, struct pf_state_key *sks, struct pf_state *s) { s->kif = kif; PF_KEYS_LOCK(); if (skw == sks) { if (pf_state_key_attach(skw, s, PF_SK_WIRE)) { PF_KEYS_UNLOCK(); return (-1); } s->key[PF_SK_STACK] = s->key[PF_SK_WIRE]; } else { if (pf_state_key_attach(skw, s, PF_SK_WIRE)) { PF_KEYS_UNLOCK(); uma_zfree(V_pf_state_key_z, sks); return (-1); } if (pf_state_key_attach(sks, s, PF_SK_STACK)) { pf_state_key_detach(s, PF_SK_WIRE); PF_KEYS_UNLOCK(); return (-1); } } if (s->id == 0 && s->creatorid == 0) { s->id = htobe64(V_pf_status.stateid++); s->creatorid = V_pf_status.hostid; } PF_IDS_LOCK(); if (RB_INSERT(pf_state_tree_id, &V_tree_id, s) != NULL) { PF_IDS_UNLOCK(); if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: state insert failed: " "id: %016llx creatorid: %08x", (unsigned long long)betoh64(s->id), ntohl(s->creatorid)); printf("\n"); } pf_detach_state(s); return (-1); } PF_IDS_UNLOCK(); PF_KEYS_UNLOCK(); PF_LIST_WLOCK(); TAILQ_INSERT_TAIL(&V_state_list, s, entry_list); PF_LIST_WUNLOCK(); V_pf_status.fcounters[FCNT_STATE_INSERT]++; V_pf_status.states++; pfi_kif_ref(kif, PFI_KIF_REF_STATE); if (pfsync_insert_state_ptr != NULL) pfsync_insert_state_ptr(s); return (0); } struct pf_state * pf_find_state_byid(struct pf_state_cmp *key) { struct pf_state *s; V_pf_status.fcounters[FCNT_STATE_SEARCH]++; PF_IDS_LOCK(); s = RB_FIND(pf_state_tree_id, &V_tree_id, (struct pf_state *)key); PF_IDS_UNLOCK(); return (s); } /* XXX debug function, intended to be removed one day */ static int pf_compare_state_keys(struct pf_state_key *a, struct pf_state_key *b, struct pfi_kif *kif, u_int dir) { /* a (from hdr) and b (new) must be exact opposites of each other */ if (a->af == b->af && a->proto == b->proto && PF_AEQ(&a->addr[0], &b->addr[1], a->af) && PF_AEQ(&a->addr[1], &b->addr[0], a->af) && a->port[0] == b->port[1] && a->port[1] == b->port[0]) return (0); else { /* mismatch. must not happen. */ printf("pf: state key linking mismatch! dir=%s, " "if=%s, stored af=%u, a0: ", dir == PF_OUT ? "OUT" : "IN", kif->pfik_name, a->af); pf_print_host(&a->addr[0], a->port[0], a->af); printf(", a1: "); pf_print_host(&a->addr[1], a->port[1], a->af); printf(", proto=%u", a->proto); printf(", found af=%u, a0: ", b->af); pf_print_host(&b->addr[0], b->port[0], b->af); printf(", a1: "); pf_print_host(&b->addr[1], b->port[1], b->af); printf(", proto=%u", b->proto); printf(".\n"); return (-1); } } static struct pf_state * pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir, struct mbuf *m, struct pf_mtag *pftag) { struct pf_state_key *sk; struct pf_state *si; V_pf_status.fcounters[FCNT_STATE_SEARCH]++; PF_KEYS_LOCK(); if (dir == PF_OUT && pftag->statekey && ((struct pf_state_key *)pftag->statekey)->reverse) sk = ((struct pf_state_key *)pftag->statekey)->reverse; else { if ((sk = RB_FIND(pf_state_tree, &V_pf_statetbl, (struct pf_state_key *)key)) == NULL) { PF_KEYS_UNLOCK(); return (NULL); } if (dir == PF_OUT && pftag->statekey && pf_compare_state_keys(pftag->statekey, sk, kif, dir) == 0) { ((struct pf_state_key *) pftag->statekey)->reverse = sk; sk->reverse = pftag->statekey; } } if (dir == PF_OUT) pftag->statekey = NULL; /* list is sorted, if-bound states before floating ones */ TAILQ_FOREACH(si, &sk->states, key_list) if ((si->kif == V_pfi_all || si->kif == kif) && sk == (dir == PF_IN ? si->key[PF_SK_WIRE] : si->key[PF_SK_STACK])) { PF_KEYS_UNLOCK(); return (si); } PF_KEYS_UNLOCK(); return (NULL); } struct pf_state * pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more) { struct pf_state_key *sk; struct pf_state *s, *ret = NULL; V_pf_status.fcounters[FCNT_STATE_SEARCH]++; PF_KEYS_LOCK(); sk = RB_FIND(pf_state_tree, &V_pf_statetbl, (struct pf_state_key *)key); if (sk != NULL) { TAILQ_FOREACH(s, &sk->states, key_list) if (dir == PF_INOUT || (sk == (dir == PF_IN ? s->key[PF_SK_WIRE] : s->key[PF_SK_STACK]))) { if (more == NULL) { PF_KEYS_UNLOCK(); return (s); } if (ret) (*more)++; else ret = s; } } PF_KEYS_UNLOCK(); return (ret); } /* END state table stuff */ void pf_purge_thread(void *v) { int nloops = 0; int locked; CURVNET_SET((struct vnet *)v); for (;;) { tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); sx_slock(&V_pf_consistency_lock); PF_LOCK(); locked = 0; if (V_pf_end_threads) { PF_UNLOCK(); sx_sunlock(&V_pf_consistency_lock); sx_xlock(&V_pf_consistency_lock); PF_LOCK(); pf_purge_expired_states(V_pf_status.states, 1); pf_purge_expired_fragments(); pf_purge_expired_src_nodes(1); V_pf_end_threads++; sx_xunlock(&V_pf_consistency_lock); PF_UNLOCK(); wakeup(pf_purge_thread); kproc_exit(0); } /* process a fraction of the state table every second */ if (!pf_purge_expired_states(1 + (V_pf_status.states / V_pf_default_rule.timeout[PFTM_INTERVAL]), 0)) { PF_UNLOCK(); sx_sunlock(&V_pf_consistency_lock); sx_xlock(&V_pf_consistency_lock); PF_LOCK(); locked = 1; pf_purge_expired_states(1 + (V_pf_status.states / V_pf_default_rule.timeout[PFTM_INTERVAL]), 1); } /* purge other expired types every PFTM_INTERVAL seconds */ if (++nloops >= V_pf_default_rule.timeout[PFTM_INTERVAL]) { pf_purge_expired_fragments(); pf_purge_expired_src_nodes(0); nloops = 0; } PF_UNLOCK(); if (locked) sx_xunlock(&V_pf_consistency_lock); else sx_sunlock(&V_pf_consistency_lock); } CURVNET_RESTORE(); } u_int32_t pf_state_expires(const struct pf_state *state) { u_int32_t timeout; u_int32_t start; u_int32_t end; u_int32_t states; /* handle all PFTM_* > PFTM_MAX here */ if (state->timeout == PFTM_PURGE) return (time_second); if (state->timeout == PFTM_UNTIL_PACKET) return (0); KASSERT(state->timeout != PFTM_UNLINKED, ("pf_state_expires: timeout == PFTM_UNLINKED")); KASSERT((state->timeout < PFTM_MAX), ("pf_state_expires: timeout > PFTM_MAX")); timeout = state->rule.ptr->timeout[state->timeout]; if (!timeout) timeout = V_pf_default_rule.timeout[state->timeout]; start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; if (start) { end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; states = state->rule.ptr->states_cur; } else { start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START]; end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END]; states = V_pf_status.states; } if (end && states > start && start < end) { if (states < end) return (state->expire + timeout * (end - states) / (end - start)); else return (time_second); } return (state->expire + timeout); } int pf_purge_expired_src_nodes(int waslocked) { struct pf_src_node *cur, *next; int locked = waslocked; for (cur = RB_MIN(pf_src_tree, &V_tree_src_tracking); cur; cur = next) { next = RB_NEXT(pf_src_tree, &V_tree_src_tracking, cur); if (cur->states <= 0 && cur->expire <= time_second) { if (! locked) { if (!sx_try_upgrade(&V_pf_consistency_lock)) return (0); /* XXXGL */ next = RB_NEXT(pf_src_tree, &V_tree_src_tracking, cur); locked = 1; } if (cur->rule.ptr != NULL) { cur->rule.ptr->src_nodes--; if (cur->rule.ptr->states_cur <= 0 && cur->rule.ptr->max_src_nodes <= 0) pf_rm_rule(NULL, cur->rule.ptr); } RB_REMOVE(pf_src_tree, &V_tree_src_tracking, cur); V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; V_pf_status.src_nodes--; uma_zfree(V_pf_src_tree_z, cur); } } if (locked && !waslocked) { sx_downgrade(&V_pf_consistency_lock); } return (1); } static void pf_src_tree_remove_state(struct pf_state *s) { u_int32_t timeout; if (s->src_node != NULL) { if (s->src.tcp_est) --s->src_node->conn; if (--s->src_node->states <= 0) { timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; if (!timeout) timeout = V_pf_default_rule.timeout[PFTM_SRC_NODE]; s->src_node->expire = time_second + timeout; } } if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { if (--s->nat_src_node->states <= 0) { timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; if (!timeout) timeout = V_pf_default_rule.timeout[PFTM_SRC_NODE]; s->nat_src_node->expire = time_second + timeout; } } s->src_node = s->nat_src_node = NULL; } void pf_unlink_state(struct pf_state *cur, int idslocked) { PF_KEYS_ASSERT(); if (cur->src.state == PF_TCPS_PROXY_DST) { /* XXX wire key the right one? */ pf_send_tcp(NULL, cur->rule.ptr, cur->key[PF_SK_WIRE]->af, &cur->key[PF_SK_WIRE]->addr[1], &cur->key[PF_SK_WIRE]->addr[0], cur->key[PF_SK_WIRE]->port[1], cur->key[PF_SK_WIRE]->port[0], cur->src.seqhi, cur->src.seqlo + 1, TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); } if (!idslocked) PF_IDS_LOCK(); RB_REMOVE(pf_state_tree_id, &V_tree_id, cur); if (!idslocked) PF_IDS_UNLOCK(); #if NPFLOW > 0 if (cur->state_flags & PFSTATE_PFLOW) if (export_pflow_ptr != NULL) export_pflow_ptr(cur); #endif if (pfsync_delete_state_ptr != NULL) pfsync_delete_state_ptr(cur); cur->timeout = PFTM_UNLINKED; pf_src_tree_remove_state(cur); pf_detach_state(cur); } /* callers should hold the * write_lock on pf_consistency_lock */ static void pf_free_state(struct pf_state *cur) { PF_LIST_WASSERT(); if (pfsync_state_in_use_ptr != NULL && pfsync_state_in_use_ptr(cur)) return; KASSERT(cur->timeout == PFTM_UNLINKED, ("pf_free_state: cur->timeout != PFTM_UNLINKED")); if (--cur->rule.ptr->states_cur <= 0 && cur->rule.ptr->src_nodes <= 0) pf_rm_rule(NULL, cur->rule.ptr); if (cur->nat_rule.ptr != NULL) if (--cur->nat_rule.ptr->states_cur <= 0 && cur->nat_rule.ptr->src_nodes <= 0) pf_rm_rule(NULL, cur->nat_rule.ptr); if (cur->anchor.ptr != NULL) if (--cur->anchor.ptr->states_cur <= 0) pf_rm_rule(NULL, cur->anchor.ptr); pf_normalize_tcp_cleanup(cur); pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE); TAILQ_REMOVE(&V_state_list, cur, entry_list); if (cur->tag) pf_tag_unref(cur->tag); uma_zfree(V_pf_state_z, cur); V_pf_status.fcounters[FCNT_STATE_REMOVALS]++; V_pf_status.states--; } static int pf_purge_expired_states(u_int32_t maxcheck, int waslocked) { static struct pf_state *cur = NULL; struct pf_state *next; int locked = waslocked; PF_LIST_WLOCK(); while (maxcheck--) { /* wrap to start of list when we hit the end */ if (cur == NULL) { cur = TAILQ_FIRST(&V_state_list); if (cur == NULL) break; /* list empty */ } /* get next state, as cur may get deleted */ next = TAILQ_NEXT(cur, entry_list); if (cur->timeout == PFTM_UNLINKED) { /* free unlinked state */ if (! locked) { if (!sx_try_upgrade(&V_pf_consistency_lock)) { PF_LIST_WUNLOCK(); return (0); /* XXXGL */ } locked = 1; } pf_free_state(cur); } else if (pf_state_expires(cur) <= time_second) { PF_KEYS_LOCK(); /* unlink and free expired state */ pf_unlink_state(cur, 0); PF_KEYS_UNLOCK(); if (! locked) { if (!sx_try_upgrade(&V_pf_consistency_lock)) { PF_LIST_WUNLOCK(); return (0); /* XXXGL */ } locked = 1; } pf_free_state(cur); } cur = next; } PF_LIST_WUNLOCK(); if (!waslocked && locked) sx_downgrade(&V_pf_consistency_lock); return (1); } int pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) { if (aw->type != PF_ADDR_TABLE) return (0); if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname, 1)) == NULL) return (1); return (0); } void pf_tbladdr_remove(struct pf_addr_wrap *aw) { if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) return; pfr_detach_table(aw->p.tbl); aw->p.tbl = NULL; } void pf_tbladdr_copyout(struct pf_addr_wrap *aw) { struct pfr_ktable *kt = aw->p.tbl; if (aw->type != PF_ADDR_TABLE || kt == NULL) return; if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) kt = kt->pfrkt_root; aw->p.tbl = NULL; aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? kt->pfrkt_cnt : -1; } void pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: { u_int32_t a = ntohl(addr->addr32[0]); printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, (a>>8)&255, a&255); if (p) { p = ntohs(p); printf(":%u", p); } break; } #endif /* INET */ #ifdef INET6 case AF_INET6: { u_int16_t b; u_int8_t i, curstart, curend, maxstart, maxend; curstart = curend = maxstart = maxend = 255; for (i = 0; i < 8; i++) { if (!addr->addr16[i]) { if (curstart == 255) curstart = i; curend = i; } else { if ((curend - curstart) > (maxend - maxstart)) { maxstart = curstart; maxend = curend; } curstart = curend = 255; } } if ((curend - curstart) > (maxend - maxstart)) { maxstart = curstart; maxend = curend; } for (i = 0; i < 8; i++) { if (i >= maxstart && i <= maxend) { if (i == 0) printf(":"); if (i == maxend) printf(":"); } else { b = ntohs(addr->addr16[i]); printf("%x", b); if (i < 7) printf(":"); } } if (p) { p = ntohs(p); printf("[%u]", p); } break; } #endif /* INET6 */ } } void pf_print_state(struct pf_state *s) { pf_print_state_parts(s, NULL, NULL); } static void pf_print_state_parts(struct pf_state *s, struct pf_state_key *skwp, struct pf_state_key *sksp) { struct pf_state_key *skw, *sks; u_int8_t proto, dir; /* Do our best to fill these, but they're skipped if NULL */ skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL); sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL); proto = skw ? skw->proto : (sks ? sks->proto : 0); dir = s ? s->direction : 0; switch (proto) { case IPPROTO_IPV4: printf("IPv4"); break; case IPPROTO_IPV6: printf("IPv6"); break; case IPPROTO_TCP: printf("TCP"); break; case IPPROTO_UDP: printf("UDP"); break; case IPPROTO_ICMP: printf("ICMP"); break; case IPPROTO_ICMPV6: printf("ICMPv6"); break; default: printf("%u", skw->proto); break; } switch (dir) { case PF_IN: printf(" in"); break; case PF_OUT: printf(" out"); break; } if (skw) { printf(" wire: "); pf_print_host(&skw->addr[0], skw->port[0], skw->af); printf(" "); pf_print_host(&skw->addr[1], skw->port[1], skw->af); } if (sks) { printf(" stack: "); if (sks != skw) { pf_print_host(&sks->addr[0], sks->port[0], sks->af); printf(" "); pf_print_host(&sks->addr[1], sks->port[1], sks->af); } else printf("-"); } if (s) { if (proto == IPPROTO_TCP) { printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, s->src.seqhi, s->src.max_win, s->src.seqdiff); if (s->src.wscale && s->dst.wscale) printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); printf("]"); printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); if (s->src.wscale && s->dst.wscale) printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); printf("]"); } 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"); if (f & TH_ECE) printf("E"); if (f & TH_CWR) printf("W"); } #define PF_SET_SKIP_STEPS(i) \ do { \ while (head[i] != cur) { \ head[i]->skip[i].ptr = cur; \ head[i] = TAILQ_NEXT(head[i], entries); \ } \ } while (0) void pf_calc_skip_steps(struct pf_rulequeue *rules) { struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; int i; cur = TAILQ_FIRST(rules); prev = cur; for (i = 0; i < PF_SKIP_COUNT; ++i) head[i] = cur; while (cur != NULL) { if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) PF_SET_SKIP_STEPS(PF_SKIP_IFP); if (cur->direction != prev->direction) PF_SET_SKIP_STEPS(PF_SKIP_DIR); if (cur->af != prev->af) PF_SET_SKIP_STEPS(PF_SKIP_AF); if (cur->proto != prev->proto) PF_SET_SKIP_STEPS(PF_SKIP_PROTO); if (cur->src.neg != prev->src.neg || pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); if (cur->src.port[0] != prev->src.port[0] || cur->src.port[1] != prev->src.port[1] || cur->src.port_op != prev->src.port_op) PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); if (cur->dst.neg != prev->dst.neg || pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); if (cur->dst.port[0] != prev->dst.port[0] || cur->dst.port[1] != prev->dst.port[1] || cur->dst.port_op != prev->dst.port_op) PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); prev = cur; cur = TAILQ_NEXT(cur, entries); } for (i = 0; i < PF_SKIP_COUNT; ++i) PF_SET_SKIP_STEPS(i); } static int pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) { if (aw1->type != aw2->type) return (1); switch (aw1->type) { case PF_ADDR_ADDRMASK: case PF_ADDR_RANGE: if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) return (1); if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) return (1); return (0); case PF_ADDR_DYNIFTL: return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); case PF_ADDR_NOROUTE: case PF_ADDR_URPFFAILED: return (0); case PF_ADDR_TABLE: return (aw1->p.tbl != aw2->p.tbl); case PF_ADDR_RTLABEL: return (aw1->v.rtlabel != aw2->v.rtlabel); default: printf("invalid address type: %d\n", aw1->type); return (1); } } 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); } static 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, sa_family_t 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 */ } } /* Changes a u_int32_t. Uses a void * so there are no align restrictions */ void pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) { u_int32_t ao; memcpy(&ao, a, sizeof(ao)); memcpy(a, &an, sizeof(u_int32_t)); *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), ao % 65536, an % 65536, u); } #ifdef INET6 static 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 */ static 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, sa_family_t af) { struct pf_addr oia, ooa; PF_ACPY(&oia, ia, af); if (oa) PF_ACPY(&ooa, oa, af); /* Change inner protocol port, fix inner protocol checksum. */ if (ip != NULL) { u_int16_t oip = *ip; u_int32_t opc; if (pc != NULL) opc = *pc; *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); } /* Change inner ip address, fix inner ip and icmp checksums. */ PF_ACPY(ia, na, af); switch (af) { #ifdef INET case AF_INET: { u_int32_t oh2c = *h2c; *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); *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 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 */ } /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */ if (oa) { 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 */ } } } /* * Need to modulate the sequence numbers in the TCP SACK option * (credits to Krzysztof Pfaff for report and patch) */ static int pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, struct tcphdr *th, struct pf_state_peer *dst) { int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; u_int8_t opts[TCP_MAXOLEN], *opt = opts; int copyback = 0, i, olen; struct sackblk sack; #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) if (hlen < TCPOLEN_SACKLEN || !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) return 0; while (hlen >= TCPOLEN_SACKLEN) { olen = opt[1]; switch (*opt) { case TCPOPT_EOL: /* FALLTHROUGH */ case TCPOPT_NOP: opt++; hlen--; break; case TCPOPT_SACK: if (olen > hlen) olen = hlen; if (olen >= TCPOLEN_SACKLEN) { for (i = 2; i + TCPOLEN_SACK <= olen; i += TCPOLEN_SACK) { memcpy(&sack, &opt[i], sizeof(sack)); pf_change_a(&sack.start, &th->th_sum, htonl(ntohl(sack.start) - dst->seqdiff), 0); pf_change_a(&sack.end, &th->th_sum, htonl(ntohl(sack.end) - dst->seqdiff), 0); memcpy(&opt[i], &sack, sizeof(sack)); } copyback = 1; } /* FALLTHROUGH */ default: if (olen < 2) olen = 2; hlen -= olen; opt += olen; } } if (copyback) m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); return (copyback); } static void pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, const struct pf_addr *saddr, const struct pf_addr *daddr, u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) { struct mbuf *m; int len, tlen; #ifdef INET struct ip *h; #endif /* INET */ #ifdef INET6 struct ip6_hdr *h6; #endif /* INET6 */ struct tcphdr *th; char *opt; struct pf_mtag *pf_mtag; KASSERT( #ifdef INET af == AF_INET #else 0 #endif || #ifdef INET6 af == AF_INET6 #else 0 #endif , ("Unsupported AF %d", af)); len = 0; th = NULL; #ifdef INET h = NULL; #endif #ifdef INET6 h6 = NULL; #endif /* maximum segment size tcp option */ tlen = sizeof(struct tcphdr); if (mss) tlen += 4; switch (af) { #ifdef INET case AF_INET: len = sizeof(struct ip) + tlen; break; #endif /* INET */ #ifdef INET6 case AF_INET6: len = sizeof(struct ip6_hdr) + tlen; break; #endif /* INET6 */ } /* create outgoing mbuf */ m = m_gethdr(M_NOWAIT, MT_HEADER); if (m == NULL) return; #ifdef MAC mac_netinet_firewall_send(m); #endif if ((pf_mtag = pf_get_mtag(m)) == NULL) { m_freem(m); return; } if (tag) m->m_flags |= M_SKIP_FIREWALL; pf_mtag->tag = rtag; if (r != NULL && r->rtableid >= 0) { M_SETFIB(m, r->rtableid); pf_mtag->rtableid = r->rtableid; } #ifdef ALTQ if (r != NULL && r->qid) { pf_mtag->qid = r->qid; /* add hints for ecn */ pf_mtag->hdr = mtod(m, struct ip *); } #endif /* ALTQ */ 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: h = mtod(m, struct ip *); /* IP header fields included in the TCP checksum */ h->ip_p = IPPROTO_TCP; h->ip_len = htons(tlen); h->ip_src.s_addr = saddr->v4.s_addr; h->ip_dst.s_addr = daddr->v4.s_addr; th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); break; #endif /* INET */ #ifdef INET6 case AF_INET6: h6 = mtod(m, struct ip6_hdr *); /* IP header fields included in the TCP checksum */ h6->ip6_nxt = IPPROTO_TCP; h6->ip6_plen = htons(tlen); memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); break; #endif /* INET6 */ } /* TCP header */ th->th_sport = sport; th->th_dport = dport; th->th_seq = htonl(seq); th->th_ack = htonl(ack); th->th_off = tlen >> 2; th->th_flags = flags; th->th_win = htons(win); if (mss) { opt = (char *)(th + 1); opt[0] = TCPOPT_MAXSEG; opt[1] = 4; HTONS(mss); bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); } switch (af) { #ifdef INET case AF_INET: /* TCP checksum */ th->th_sum = in_cksum(m, len); /* Finish the IP header */ h->ip_v = 4; h->ip_hl = sizeof(*h) >> 2; h->ip_tos = IPTOS_LOWDELAY; h->ip_off = V_path_mtu_discovery ? IP_DF : 0; h->ip_len = len; h->ip_ttl = ttl ? ttl : V_ip_defttl; h->ip_sum = 0; if (eh == NULL) { PF_UNLOCK(); ip_output(m, (void *)NULL, (void *)NULL, 0, (void *)NULL, (void *)NULL); PF_LOCK(); } else { struct route ro; struct rtentry rt; struct ether_header *e = (void *)ro.ro_dst.sa_data; if (ifp == NULL) { m_freem(m); return; } rt.rt_ifp = ifp; ro.ro_rt = &rt; ro.ro_dst.sa_len = sizeof(ro.ro_dst); ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); e->ether_type = eh->ether_type; PF_UNLOCK(); /* XXX_IMPORT: later */ ip_output(m, (void *)NULL, &ro, 0, (void *)NULL, (void *)NULL); PF_LOCK(); } break; #endif /* INET */ #ifdef INET6 case AF_INET6: /* TCP checksum */ th->th_sum = in6_cksum(m, IPPROTO_TCP, sizeof(struct ip6_hdr), tlen); h6->ip6_vfc |= IPV6_VERSION; h6->ip6_hlim = IPV6_DEFHLIM; PF_UNLOCK(); ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); PF_LOCK(); break; #endif /* INET6 */ } } static void pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, struct pf_rule *r) { struct mbuf *m0; #ifdef INET struct ip *ip; #endif struct pf_mtag *pf_mtag; if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) return; if ((pf_mtag = pf_get_mtag(m0)) == NULL) return; /* XXX: revisit */ m0->m_flags |= M_SKIP_FIREWALL; if (r->rtableid >= 0) { M_SETFIB(m0, r->rtableid); pf_mtag->rtableid = r->rtableid; } #ifdef ALTQ if (r->qid) { pf_mtag->qid = r->qid; /* add hints for ecn */ pf_mtag->hdr = mtod(m0, struct ip *); } #endif /* ALTQ */ switch (af) { #ifdef INET case AF_INET: /* icmp_error() expects host byte ordering */ ip = mtod(m0, struct ip *); NTOHS(ip->ip_len); NTOHS(ip->ip_off); PF_UNLOCK(); icmp_error(m0, type, code, 0, 0); PF_LOCK(); break; #endif /* INET */ #ifdef INET6 case AF_INET6: PF_UNLOCK(); icmp6_error(m0, type, code, 0); PF_LOCK(); 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, sa_family_t 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); } } /* * Return 1 if b <= a <= e, otherwise return 0. */ int pf_match_addr_range(struct pf_addr *b, struct pf_addr *e, struct pf_addr *a, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: if ((a->addr32[0] < b->addr32[0]) || (a->addr32[0] > e->addr32[0])) return (0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: { int i; /* check a >= b */ for (i = 0; i < 4; ++i) if (a->addr32[i] > b->addr32[i]) break; else if (a->addr32[i] < b->addr32[i]) return (0); /* check a <= e */ for (i = 0; i < 4; ++i) if (a->addr32[i] < e->addr32[i]) break; else if (a->addr32[i] > e->addr32[i]) return (0); break; } #endif /* INET6 */ } return (1); } static int pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) { switch (op) { case PF_OP_IRG: return ((p > a1) && (p < a2)); case PF_OP_XRG: return ((p < a1) || (p > a2)); case PF_OP_RRG: 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_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) { NTOHS(a1); NTOHS(a2); NTOHS(p); return (pf_match(op, a1, a2, p)); } static int pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) { if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) return (0); return (pf_match(op, a1, a2, u)); } static int pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) { if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) return (0); return (pf_match(op, a1, a2, g)); } int pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, struct pf_mtag *pf_mtag) { if (*tag == -1) *tag = pf_mtag->tag; return ((!r->match_tag_not && r->match_tag == *tag) || (r->match_tag_not && r->match_tag != *tag)); } int pf_tag_packet(struct mbuf *m, int tag, int rtableid, struct pf_mtag *pf_mtag) { if (tag <= 0 && rtableid < 0) return (0); if (tag > 0) pf_mtag->tag = tag; if (rtableid >= 0) { M_SETFIB(m, rtableid); } return (0); } void pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, int *match) { struct pf_anchor_stackframe *f; PF_RULES_RASSERT(); (*r)->anchor->match = 0; if (match) *match = 0; if (*depth >= sizeof(V_pf_anchor_stack) / sizeof(V_pf_anchor_stack[0])) { printf("pf_step_into_anchor: stack overflow\n"); *r = TAILQ_NEXT(*r, entries); return; } else if (*depth == 0 && a != NULL) *a = *r; f = V_pf_anchor_stack + (*depth)++; f->rs = *rs; f->r = *r; if ((*r)->anchor_wildcard) { f->parent = &(*r)->anchor->children; if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == NULL) { *r = NULL; return; } *rs = &f->child->ruleset; } else { f->parent = NULL; f->child = NULL; *rs = &(*r)->anchor->ruleset; } *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); } int pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a, int *match) { struct pf_anchor_stackframe *f; int quick = 0; PF_RULES_RASSERT(); do { if (*depth <= 0) break; f = V_pf_anchor_stack + *depth - 1; if (f->parent != NULL && f->child != NULL) { if (f->child->match || (match != NULL && *match)) { f->r->anchor->match = 1; *match = 0; } f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); if (f->child != NULL) { *rs = &f->child->ruleset; *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); if (*r == NULL) continue; else break; } } (*depth)--; if (*depth == 0 && a != NULL) *a = NULL; *rs = f->rs; if (f->r->anchor->match || (match != NULL && *match)) quick = f->r->quick; *r = TAILQ_NEXT(f->r, entries); } while (*r == NULL); return (quick); } #ifdef INET6 void pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); break; #endif /* INET */ case AF_INET6: naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); break; } } void pf_addr_inc(struct pf_addr *addr, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); break; #endif /* INET */ case AF_INET6: if (addr->addr32[3] == 0xffffffff) { addr->addr32[3] = 0; if (addr->addr32[2] == 0xffffffff) { addr->addr32[2] = 0; if (addr->addr32[1] == 0xffffffff) { addr->addr32[1] = 0; addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); } else addr->addr32[1] = htonl(ntohl(addr->addr32[1]) + 1); } else addr->addr32[2] = htonl(ntohl(addr->addr32[2]) + 1); } else addr->addr32[3] = htonl(ntohl(addr->addr32[3]) + 1); break; } } #endif /* INET6 */ static int pf_socket_lookup(int direction, struct pf_pdesc *pd, struct inpcb *inp_arg) { struct pf_addr *saddr, *daddr; u_int16_t sport, dport; struct inpcbinfo *pi; struct inpcb *inp; if (pd == NULL) return (-1); pd->lookup.uid = UID_MAX; pd->lookup.gid = GID_MAX; pd->lookup.pid = NO_PID; if (inp_arg != NULL) { INP_LOCK_ASSERT(inp_arg); pd->lookup.uid = inp_arg->inp_cred->cr_uid; pd->lookup.gid = inp_arg->inp_cred->cr_groups[0]; return (1); } switch (pd->proto) { case IPPROTO_TCP: if (pd->hdr.tcp == NULL) return (-1); sport = pd->hdr.tcp->th_sport; dport = pd->hdr.tcp->th_dport; pi = &V_tcbinfo; break; case IPPROTO_UDP: if (pd->hdr.udp == NULL) return (-1); sport = pd->hdr.udp->uh_sport; dport = pd->hdr.udp->uh_dport; pi = &V_udbinfo; break; default: return (-1); } if (direction == PF_IN) { saddr = pd->src; daddr = pd->dst; } else { u_int16_t p; p = sport; sport = dport; dport = p; saddr = pd->dst; daddr = pd->src; } switch (pd->af) { #ifdef INET case AF_INET: /* * XXXRW: would be nice if we had an mbuf here so that we * could use in_pcblookup_mbuf(). */ inp = in_pcblookup(pi, saddr->v4, sport, daddr->v4, dport, INPLOOKUP_RLOCKPCB, NULL); if (inp == NULL) { inp = in_pcblookup(pi, saddr->v4, sport, daddr->v4, dport, INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); if (inp == NULL) return (-1); } break; #endif /* INET */ #ifdef INET6 case AF_INET6: /* * XXXRW: would be nice if we had an mbuf here so that we * could use in6_pcblookup_mbuf(). */ inp = in6_pcblookup(pi, &saddr->v6, sport, &daddr->v6, dport, INPLOOKUP_RLOCKPCB, NULL); if (inp == NULL) { inp = in6_pcblookup(pi, &saddr->v6, sport, &daddr->v6, dport, INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); if (inp == NULL) return (-1); } break; #endif /* INET6 */ default: return (-1); } INP_RLOCK_ASSERT(inp); pd->lookup.uid = inp->inp_cred->cr_uid; pd->lookup.gid = inp->inp_cred->cr_groups[0]; INP_RUNLOCK(inp); return (1); } static u_int8_t pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) { int hlen; u_int8_t hdr[60]; u_int8_t *opt, optlen; u_int8_t wscale = 0; hlen = th_off << 2; /* hlen <= sizeof(hdr) */ if (hlen <= sizeof(struct tcphdr)) return (0); if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) return (0); opt = hdr + sizeof(struct tcphdr); hlen -= sizeof(struct tcphdr); while (hlen >= 3) { switch (*opt) { case TCPOPT_EOL: case TCPOPT_NOP: ++opt; --hlen; break; case TCPOPT_WINDOW: wscale = opt[2]; if (wscale > TCP_MAX_WINSHIFT) wscale = TCP_MAX_WINSHIFT; wscale |= PF_WSCALE_FLAG; /* FALLTHROUGH */ default: optlen = opt[1]; if (optlen < 2) optlen = 2; hlen -= optlen; opt += optlen; break; } } return (wscale); } static u_int16_t pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) { int hlen; u_int8_t hdr[60]; u_int8_t *opt, optlen; u_int16_t mss = V_tcp_mssdflt; hlen = th_off << 2; /* hlen <= sizeof(hdr) */ if (hlen <= sizeof(struct tcphdr)) return (0); if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) return (0); opt = hdr + sizeof(struct tcphdr); hlen -= sizeof(struct tcphdr); while (hlen >= TCPOLEN_MAXSEG) { switch (*opt) { case TCPOPT_EOL: case TCPOPT_NOP: ++opt; --hlen; break; case TCPOPT_MAXSEG: bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); NTOHS(mss); /* FALLTHROUGH */ default: optlen = opt[1]; if (optlen < 2) optlen = 2; hlen -= optlen; opt += optlen; break; } } return (mss); } static u_int16_t pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer) { #ifdef INET struct sockaddr_in *dst; struct route ro; #endif /* INET */ #ifdef INET6 struct sockaddr_in6 *dst6; struct route_in6 ro6; #endif /* INET6 */ struct rtentry *rt = NULL; int hlen = 0; u_int16_t mss = V_tcp_mssdflt; switch (af) { #ifdef INET case AF_INET: hlen = sizeof(struct ip); bzero(&ro, sizeof(ro)); dst = (struct sockaddr_in *)&ro.ro_dst; dst->sin_family = AF_INET; dst->sin_len = sizeof(*dst); dst->sin_addr = addr->v4; in_rtalloc_ign(&ro, 0, rtableid); rt = ro.ro_rt; break; #endif /* INET */ #ifdef INET6 case AF_INET6: hlen = sizeof(struct ip6_hdr); bzero(&ro6, sizeof(ro6)); dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; dst6->sin6_family = AF_INET6; dst6->sin6_len = sizeof(*dst6); dst6->sin6_addr = addr->v6; in6_rtalloc_ign(&ro6, 0, rtableid); rt = ro6.ro_rt; break; #endif /* INET6 */ } if (rt && rt->rt_ifp) { mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); mss = max(V_tcp_mssdflt, mss); RTFREE(rt); } mss = min(mss, offer); mss = max(mss, 64); /* sanity - at least max opt space */ return (mss); } static void pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) { struct pf_rule *r = s->rule.ptr; struct pf_src_node *sn = NULL; s->rt_kif = NULL; if (!r->rt || r->rt == PF_FASTROUTE) return; switch (s->key[PF_SK_WIRE]->af) { #ifdef INET case AF_INET: pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, &sn); s->rt_kif = r->rpool.cur->kif; break; #endif /* INET */ #ifdef INET6 case AF_INET6: pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, &sn); s->rt_kif = r->rpool.cur->kif; break; #endif /* INET6 */ } } static u_int32_t pf_tcp_iss(struct pf_pdesc *pd) { MD5_CTX ctx; u_int32_t digest[4]; if (V_pf_tcp_secret_init == 0) { read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); MD5Init(&V_pf_tcp_secret_ctx); MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret, sizeof(V_pf_tcp_secret)); V_pf_tcp_secret_init = 1; } ctx = V_pf_tcp_secret_ctx; MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short)); MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short)); if (pd->af == AF_INET6) { MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr)); MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr)); } else { MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr)); MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr)); } MD5Final((u_char *)digest, &ctx); V_pf_tcp_iss_off += 4096; #define ISN_RANDOM_INCREMENT (4096 - 1) return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) + V_pf_tcp_iss_off); #undef ISN_RANDOM_INCREMENT } static int pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction, struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq, struct inpcb *inp) { struct pf_rule *nr = NULL; struct pf_addr *saddr = pd->src, *daddr = pd->dst; sa_family_t af = pd->af; struct pf_rule *r, *a = NULL; struct pf_ruleset *ruleset = NULL; struct pf_src_node *nsn = NULL; struct tcphdr *th = pd->hdr.tcp; struct pf_state_key *skw = NULL, *sks = NULL; struct pf_state_key *sk = NULL, *nk = NULL; u_short reason; int rewrite = 0, hdrlen = 0; int tag = -1, rtableid = -1; int asd = 0; int match = 0; int state_icmp = 0; u_int16_t sport = 0, dport = 0; u_int16_t bproto_sum = 0, bip_sum = 0; u_int8_t icmptype = 0, icmpcode = 0; if (direction == PF_IN && pf_check_congestion(ifq)) { REASON_SET(&reason, PFRES_CONGEST); return (PF_DROP); } if (inp != NULL) pd->lookup.done = pf_socket_lookup(direction, pd, inp); else if (V_debug_pfugidhack) { PF_UNLOCK(); DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); pd->lookup.done = pf_socket_lookup(direction, pd, inp); PF_LOCK(); } switch (pd->proto) { case IPPROTO_TCP: sport = th->th_sport; dport = th->th_dport; hdrlen = sizeof(*th); break; case IPPROTO_UDP: sport = pd->hdr.udp->uh_sport; dport = pd->hdr.udp->uh_dport; hdrlen = sizeof(*pd->hdr.udp); break; #ifdef INET case IPPROTO_ICMP: if (pd->af != AF_INET) break; sport = dport = pd->hdr.icmp->icmp_id; hdrlen = sizeof(*pd->hdr.icmp); icmptype = pd->hdr.icmp->icmp_type; icmpcode = pd->hdr.icmp->icmp_code; if (icmptype == ICMP_UNREACH || icmptype == ICMP_SOURCEQUENCH || icmptype == ICMP_REDIRECT || icmptype == ICMP_TIMXCEED || icmptype == ICMP_PARAMPROB) state_icmp++; break; #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: if (af != AF_INET6) break; sport = dport = pd->hdr.icmp6->icmp6_id; hdrlen = sizeof(*pd->hdr.icmp6); icmptype = pd->hdr.icmp6->icmp6_type; icmpcode = pd->hdr.icmp6->icmp6_code; if (icmptype == ICMP6_DST_UNREACH || icmptype == ICMP6_PACKET_TOO_BIG || icmptype == ICMP6_TIME_EXCEEDED || icmptype == ICMP6_PARAM_PROB) state_icmp++; break; #endif /* INET6 */ default: sport = dport = hdrlen = 0; break; } r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); /* check packet for BINAT/NAT/RDR */ if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) { if (nk == NULL || sk == NULL) { REASON_SET(&reason, PFRES_MEMORY); goto cleanup; } if (pd->ip_sum) bip_sum = *pd->ip_sum; switch (pd->proto) { case IPPROTO_TCP: bproto_sum = th->th_sum; pd->proto_sum = &th->th_sum; if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || nk->port[pd->sidx] != sport) { pf_change_ap(saddr, &th->th_sport, pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], nk->port[pd->sidx], 0, af); pd->sport = &th->th_sport; sport = th->th_sport; } if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || nk->port[pd->didx] != dport) { pf_change_ap(daddr, &th->th_dport, pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], nk->port[pd->didx], 0, af); dport = th->th_dport; pd->dport = &th->th_dport; } rewrite++; break; case IPPROTO_UDP: bproto_sum = pd->hdr.udp->uh_sum; pd->proto_sum = &pd->hdr.udp->uh_sum; if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) || nk->port[pd->sidx] != sport) { pf_change_ap(saddr, &pd->hdr.udp->uh_sport, pd->ip_sum, &pd->hdr.udp->uh_sum, &nk->addr[pd->sidx], nk->port[pd->sidx], 1, af); sport = pd->hdr.udp->uh_sport; pd->sport = &pd->hdr.udp->uh_sport; } if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) || nk->port[pd->didx] != dport) { pf_change_ap(daddr, &pd->hdr.udp->uh_dport, pd->ip_sum, &pd->hdr.udp->uh_sum, &nk->addr[pd->didx], nk->port[pd->didx], 1, af); dport = pd->hdr.udp->uh_dport; pd->dport = &pd->hdr.udp->uh_dport; } rewrite++; break; #ifdef INET case IPPROTO_ICMP: nk->port[0] = nk->port[1]; if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) pf_change_a(&saddr->v4.s_addr, pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 0); if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) pf_change_a(&daddr->v4.s_addr, pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 0); if (nk->port[1] != pd->hdr.icmp->icmp_id) { pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( pd->hdr.icmp->icmp_cksum, sport, nk->port[1], 0); pd->hdr.icmp->icmp_id = nk->port[1]; pd->sport = &pd->hdr.icmp->icmp_id; } m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp); break; #endif /* INET */ #ifdef INET6 case IPPROTO_ICMPV6: nk->port[0] = nk->port[1]; if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, &nk->addr[pd->sidx], 0); if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, &nk->addr[pd->didx], 0); rewrite++; break; #endif /* INET */ default: switch (af) { #ifdef INET case AF_INET: if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET)) pf_change_a(&saddr->v4.s_addr, pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 0); if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET)) pf_change_a(&daddr->v4.s_addr, pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6)) PF_ACPY(saddr, &nk->addr[pd->sidx], af); if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6)) PF_ACPY(saddr, &nk->addr[pd->didx], af); break; #endif /* INET */ } break; } if (nr->natpass) r = NULL; pd->nat_rule = nr; } while (r != NULL) { r->evaluations++; if (pfi_kif_match(r->kif, kif) == r->ifnot) r = r->skip[PF_SKIP_IFP].ptr; else if (r->direction && r->direction != direction) r = r->skip[PF_SKIP_DIR].ptr; else if (r->af && r->af != af) r = r->skip[PF_SKIP_AF].ptr; else if (r->proto && r->proto != pd->proto) r = r->skip[PF_SKIP_PROTO].ptr; else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.neg, kif, M_GETFIB(m))) r = r->skip[PF_SKIP_SRC_ADDR].ptr; /* tcp/udp only. port_op always 0 in other cases */ else if (r->src.port_op && !pf_match_port(r->src.port_op, r->src.port[0], r->src.port[1], sport)) r = r->skip[PF_SKIP_SRC_PORT].ptr; else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.neg, NULL, M_GETFIB(m))) r = r->skip[PF_SKIP_DST_ADDR].ptr; /* tcp/udp only. port_op always 0 in other cases */ else if (r->dst.port_op && !pf_match_port(r->dst.port_op, r->dst.port[0], r->dst.port[1], dport)) r = r->skip[PF_SKIP_DST_PORT].ptr; /* icmp only. type always 0 in other cases */ else if (r->type && r->type != icmptype + 1) r = TAILQ_NEXT(r, entries); /* icmp only. type always 0 in other cases */ else if (r->code && r->code != icmpcode + 1) r = TAILQ_NEXT(r, entries); else if (r->tos && !(r->tos == pd->tos)) r = TAILQ_NEXT(r, entries); else if (r->rule_flag & PFRULE_FRAGMENT) r = TAILQ_NEXT(r, entries); else if (pd->proto == IPPROTO_TCP && (r->flagset & th->th_flags) != r->flags) r = TAILQ_NEXT(r, entries); /* tcp/udp only. uid.op always 0 in other cases */ else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = pf_socket_lookup(direction, pd, inp), 1)) && !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], pd->lookup.uid)) r = TAILQ_NEXT(r, entries); /* tcp/udp only. gid.op always 0 in other cases */ else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = pf_socket_lookup(direction, pd, inp), 1)) && !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], pd->lookup.gid)) r = TAILQ_NEXT(r, entries); else if (r->prob && r->prob <= arc4random()) r = TAILQ_NEXT(r, entries); else if (r->match_tag && !pf_match_tag(m, r, &tag, pd->pf_mtag)) r = TAILQ_NEXT(r, entries); else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != IPPROTO_TCP || !pf_osfp_match( pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint))) r = TAILQ_NEXT(r, entries); else { if (r->tag) tag = r->tag; if (r->rtableid >= 0) rtableid = r->rtableid; if (r->anchor == NULL) { match = 1; *rm = r; *am = a; *rsm = ruleset; if ((*rm)->quick) break; r = TAILQ_NEXT(r, entries); } else pf_step_into_anchor(&asd, &ruleset, PF_RULESET_FILTER, &r, &a, &match); } if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, PF_RULESET_FILTER, &r, &a, &match)) break; } r = *rm; a = *am; ruleset = *rsm; REASON_SET(&reason, PFRES_MATCH); if (r->log || (nr != NULL && nr->log)) { if (rewrite) m_copyback(m, off, hdrlen, pd->hdr.any); PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, a, ruleset, pd); } if ((r->action == PF_DROP) && ((r->rule_flag & PFRULE_RETURNRST) || (r->rule_flag & PFRULE_RETURNICMP) || (r->rule_flag & PFRULE_RETURN))) { /* undo NAT changes, if they have taken place */ if (nr != NULL) { PF_ACPY(saddr, &sk->addr[pd->sidx], af); PF_ACPY(daddr, &sk->addr[pd->didx], af); if (pd->sport) *pd->sport = sk->port[pd->sidx]; if (pd->dport) *pd->dport = sk->port[pd->didx]; if (pd->proto_sum) *pd->proto_sum = bproto_sum; if (pd->ip_sum) *pd->ip_sum = bip_sum; m_copyback(m, off, hdrlen, pd->hdr.any); } if (pd->proto == IPPROTO_TCP && ((r->rule_flag & PFRULE_RETURNRST) || (r->rule_flag & PFRULE_RETURN)) && !(th->th_flags & TH_RST)) { u_int32_t ack = ntohl(th->th_seq) + pd->p_len; int len = 0; #ifdef INET struct ip *h4; #endif #ifdef INET6 struct ip6_hdr *h6; #endif switch (af) { #ifdef INET case AF_INET: h4 = mtod(m, struct ip *); len = ntohs(h4->ip_len) - off; break; #endif #ifdef INET6 case AF_INET6: h6 = mtod(m, struct ip6_hdr *); len = ntohs(h6->ip6_plen) - (off - sizeof(*h6)); break; #endif } if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af)) REASON_SET(&reason, PFRES_PROTCKSUM); else { if (th->th_flags & TH_SYN) ack++; if (th->th_flags & TH_FIN) ack++; pf_send_tcp(m, r, af, pd->dst, pd->src, th->th_dport, th->th_sport, ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); } } else if (pd->proto != IPPROTO_ICMP && af == AF_INET && r->return_icmp) pf_send_icmp(m, r->return_icmp >> 8, r->return_icmp & 255, af, r); else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 && r->return_icmp6) pf_send_icmp(m, r->return_icmp6 >> 8, r->return_icmp6 & 255, af, r); } if (r->action == PF_DROP) goto cleanup; if (pf_tag_packet(m, tag, rtableid, pd->pf_mtag)) { REASON_SET(&reason, PFRES_MEMORY); goto cleanup; } if (!state_icmp && (r->keep_state || nr != NULL || (pd->flags & PFDESC_TCP_NORM))) { int action; action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m, off, sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum, hdrlen); if (action != PF_PASS) return (action); } else { if (sk != NULL) uma_zfree(V_pf_state_key_z, sk); if (nk != NULL) uma_zfree(V_pf_state_key_z, nk); } /* copy back packet headers if we performed NAT operations */ if (rewrite) m_copyback(m, off, hdrlen, pd->hdr.any); if (*sm != NULL && !ISSET((*sm)->state_flags, PFSTATE_NOSYNC) && direction == PF_OUT && pfsync_up_ptr != NULL && pfsync_up_ptr()) { /* * We want the state created, but we dont * want to send this in case a partner * firewall has to know about it to allow * replies through it. */ if (pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m)) return (PF_DEFER); } return (PF_PASS); cleanup: if (sk != NULL) uma_zfree(V_pf_state_key_z, sk); if (nk != NULL) uma_zfree(V_pf_state_key_z, nk); return (PF_DROP); } static __inline int pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a, struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw, struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen) { struct pf_state *s = NULL; struct pf_src_node *sn = NULL; struct tcphdr *th = pd->hdr.tcp; u_int16_t mss = V_tcp_mssdflt; u_short reason; /* check maximums */ if (r->max_states && (r->states_cur >= r->max_states)) { V_pf_status.lcounters[LCNT_STATES]++; REASON_SET(&reason, PFRES_MAXSTATES); return (PF_DROP); } /* src node for filter rule */ if ((r->rule_flag & PFRULE_SRCTRACK || r->rpool.opts & PF_POOL_STICKYADDR) && pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) { REASON_SET(&reason, PFRES_SRCLIMIT); goto csfailed; } /* src node for translation rule */ if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) { REASON_SET(&reason, PFRES_SRCLIMIT); goto csfailed; } s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO); if (s == NULL) { REASON_SET(&reason, PFRES_MEMORY); goto csfailed; } s->rule.ptr = r; s->nat_rule.ptr = nr; s->anchor.ptr = a; STATE_INC_COUNTERS(s); if (r->allow_opts) s->state_flags |= PFSTATE_ALLOWOPTS; if (r->rule_flag & PFRULE_STATESLOPPY) s->state_flags |= PFSTATE_SLOPPY; if (r->rule_flag & PFRULE_PFLOW) s->state_flags |= PFSTATE_PFLOW; s->log = r->log & PF_LOG_ALL; s->sync_state = PFSYNC_S_NONE; if (nr != NULL) s->log |= nr->log & PF_LOG_ALL; switch (pd->proto) { case IPPROTO_TCP: s->src.seqlo = ntohl(th->th_seq); s->src.seqhi = s->src.seqlo + pd->p_len + 1; if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && r->keep_state == PF_STATE_MODULATE) { /* Generate sequence number modulator */ if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) == 0) s->src.seqdiff = 1; 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++; s->src.wscale = pf_get_wscale(m, off, th->th_off, pd->af); } s->src.max_win = MAX(ntohs(th->th_win), 1); if (s->src.wscale & PF_WSCALE_MASK) { /* Remove scale factor from initial window */ int win = s->src.max_win; win += 1 << (s->src.wscale & PF_WSCALE_MASK); s->src.max_win = (win - 1) >> (s->src.wscale & PF_WSCALE_MASK); } if (th->th_flags & TH_FIN) s->src.seqhi++; s->dst.seqhi = 1; s->dst.max_win = 1; s->src.state = TCPS_SYN_SENT; s->dst.state = TCPS_CLOSED; s->timeout = PFTM_TCP_FIRST_PACKET; break; case IPPROTO_UDP: s->src.state = PFUDPS_SINGLE; s->dst.state = PFUDPS_NO_TRAFFIC; s->timeout = PFTM_UDP_FIRST_PACKET; break; case IPPROTO_ICMP: #ifdef INET6 case IPPROTO_ICMPV6: #endif s->timeout = PFTM_ICMP_FIRST_PACKET; break; default: s->src.state = PFOTHERS_SINGLE; s->dst.state = PFOTHERS_NO_TRAFFIC; s->timeout = PFTM_OTHER_FIRST_PACKET; } s->creation = time_second; s->expire = time_second; if (sn != NULL) { s->src_node = sn; s->src_node->states++; } if (nsn != NULL) { /* XXX We only modify one side for now. */ PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af); s->nat_src_node = nsn; s->nat_src_node->states++; } if (pd->proto == IPPROTO_TCP) { if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, off, pd, th, &s->src, &s->dst)) { REASON_SET(&reason, PFRES_MEMORY); pf_src_tree_remove_state(s); STATE_DEC_COUNTERS(s); uma_zfree(V_pf_state_z, s); return (PF_DROP); } if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, &s->src, &s->dst, rewrite)) { /* This really shouldn't happen!!! */ DPFPRINTF(PF_DEBUG_URGENT, ("pf_normalize_tcp_stateful failed on first pkt")); pf_normalize_tcp_cleanup(s); pf_src_tree_remove_state(s); STATE_DEC_COUNTERS(s); uma_zfree(V_pf_state_z, s); return (PF_DROP); } } s->direction = pd->dir; if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk, pd->src, pd->dst, sport, dport)) goto csfailed; if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) { if (pd->proto == IPPROTO_TCP) pf_normalize_tcp_cleanup(s); REASON_SET(&reason, PFRES_STATEINS); pf_src_tree_remove_state(s); STATE_DEC_COUNTERS(s); uma_zfree(V_pf_state_z, s); return (PF_DROP); } else *sm = s; pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */ if (tag > 0) { pf_tag_ref(tag); s->tag = tag; } if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && r->keep_state == PF_STATE_SYNPROXY) { s->src.state = PF_TCPS_PROXY_SRC; /* undo NAT changes, if they have taken place */ if (nr != NULL) { struct pf_state_key *skt = s->key[PF_SK_WIRE]; if (pd->dir == PF_OUT) skt = s->key[PF_SK_STACK]; PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af); PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af); if (pd->sport) *pd->sport = skt->port[pd->sidx]; if (pd->dport) *pd->dport = skt->port[pd->didx]; if (pd->proto_sum) *pd->proto_sum = bproto_sum; if (pd->ip_sum) *pd->ip_sum = bip_sum; m_copyback(m, off, hdrlen, pd->hdr.any); } s->src.seqhi = htonl(arc4random()); /* Find mss option */ int rtid = M_GETFIB(m); mss = pf_get_mss(m, off, th->th_off, pd->af); mss = pf_calc_mss(pd->src, pd->af, rtid, mss); mss = pf_calc_mss(pd->dst, pd->af, rtid, mss); s->src.mss = mss; pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport, th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); REASON_SET(&reason, PFRES_SYNPROXY); return (PF_SYNPROXY_DROP); } return (PF_PASS); csfailed: if (sk != NULL) uma_zfree(V_pf_state_key_z, sk); if (nk != NULL) uma_zfree(V_pf_state_key_z, nk); if (sn != NULL && sn->states == 0 && sn->expire == 0) { RB_REMOVE(pf_src_tree, &V_tree_src_tracking, sn); V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; V_pf_status.src_nodes--; uma_zfree(V_pf_src_tree_z, sn); } if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) { RB_REMOVE(pf_src_tree, &V_tree_src_tracking, nsn); V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; V_pf_status.src_nodes--; uma_zfree(V_pf_src_tree_z, nsn); } return (PF_DROP); } static int pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm) { struct pf_rule *r, *a = NULL; struct pf_ruleset *ruleset = NULL; sa_family_t af = pd->af; u_short reason; int tag = -1; int asd = 0; int match = 0; PF_RULES_RASSERT(); r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); while (r != NULL) { r->evaluations++; if (pfi_kif_match(r->kif, kif) == r->ifnot) r = r->skip[PF_SKIP_IFP].ptr; else if (r->direction && r->direction != direction) r = r->skip[PF_SKIP_DIR].ptr; else if (r->af && r->af != af) r = r->skip[PF_SKIP_AF].ptr; else if (r->proto && r->proto != pd->proto) r = r->skip[PF_SKIP_PROTO].ptr; else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.neg, kif, M_GETFIB(m))) r = r->skip[PF_SKIP_SRC_ADDR].ptr; else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.neg, NULL, M_GETFIB(m))) r = r->skip[PF_SKIP_DST_ADDR].ptr; else if (r->tos && !(r->tos == pd->tos)) r = TAILQ_NEXT(r, entries); else if (r->os_fingerprint != PF_OSFP_ANY) r = TAILQ_NEXT(r, entries); else if (pd->proto == IPPROTO_UDP && (r->src.port_op || r->dst.port_op)) r = TAILQ_NEXT(r, entries); else if (pd->proto == IPPROTO_TCP && (r->src.port_op || r->dst.port_op || r->flagset)) r = TAILQ_NEXT(r, entries); else if ((pd->proto == IPPROTO_ICMP || pd->proto == IPPROTO_ICMPV6) && (r->type || r->code)) r = TAILQ_NEXT(r, entries); else if (r->prob && r->prob <= (arc4random() % (UINT_MAX - 1) + 1)) r = TAILQ_NEXT(r, entries); else if (r->match_tag && !pf_match_tag(m, r, &tag, pd->pf_mtag)) r = TAILQ_NEXT(r, entries); else { if (r->anchor == NULL) { match = 1; *rm = r; *am = a; *rsm = ruleset; if ((*rm)->quick) break; r = TAILQ_NEXT(r, entries); } else pf_step_into_anchor(&asd, &ruleset, PF_RULESET_FILTER, &r, &a, &match); } if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, PF_RULESET_FILTER, &r, &a, &match)) break; } r = *rm; a = *am; ruleset = *rsm; REASON_SET(&reason, PFRES_MATCH); if (r->log) PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, pd); if (r->action != PF_PASS) return (PF_DROP); if (pf_tag_packet(m, tag, -1, pd->pf_mtag)) { REASON_SET(&reason, PFRES_MEMORY); return (PF_DROP); } return (PF_PASS); } static int pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd, u_short *reason, int *copyback) { struct tcphdr *th = pd->hdr.tcp; u_int16_t win = ntohs(th->th_win); u_int32_t ack, end, seq, orig_seq; u_int8_t sws, dws; int ackskew; if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { sws = src->wscale & PF_WSCALE_MASK; dws = dst->wscale & PF_WSCALE_MASK; } else sws = dws = 0; /* * Sequence tracking algorithm from Guido van Rooij's paper: * http://www.madison-gurkha.com/publications/tcp_filtering/ * tcp_filtering.ps */ orig_seq = seq = ntohl(th->th_seq); if (src->seqlo == 0) { /* First packet from this end. Set its state */ if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && src->scrub == NULL) { if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { REASON_SET(reason, PFRES_MEMORY); return (PF_DROP); } } /* Deferred generation of sequence number modulator */ if (dst->seqdiff && !src->seqdiff) { /* use random iss for the TCP server */ while ((src->seqdiff = arc4random() - seq) == 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); *copyback = 1; } else { ack = ntohl(th->th_ack); } end = seq + pd->p_len; if (th->th_flags & TH_SYN) { end++; if (dst->wscale & PF_WSCALE_FLAG) { src->wscale = pf_get_wscale(m, off, th->th_off, pd->af); if (src->wscale & PF_WSCALE_FLAG) { /* Remove scale factor from initial * window */ sws = src->wscale & PF_WSCALE_MASK; win = ((u_int32_t)win + (1 << sws) - 1) >> sws; dws = dst->wscale & PF_WSCALE_MASK; } else { /* fixup other window */ dst->max_win <<= dst->wscale & PF_WSCALE_MASK; /* in case of a retrans SYN|ACK */ dst->wscale = 0; } } } 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 (src->seqhi == 1 || SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) src->seqhi = end + MAX(1, dst->max_win << dws); 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); *copyback = 1; } 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; /* * Need to demodulate the sequence numbers in any TCP SACK options * (Selective ACK). We could optionally validate the SACK values * against the current ACK window, either forwards or backwards, but * I'm not confident that SACK has been implemented properly * everywhere. It wouldn't surprise me if several stacks accidently * SACK too far backwards of previously ACKed data. There really aren't * any security implications of bad SACKing unless the target stack * doesn't validate the option length correctly. Someone trying to * spoof into a TCP connection won't bother blindly sending SACK * options anyway. */ if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { if (pf_modulate_sack(m, off, pd, th, dst)) *copyback = 1; } #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 << dws)) && /* Retrans: not more than one window back */ (ackskew >= -MAXACKWINDOW) && /* Acking not more than one reassembled fragment backwards */ (ackskew <= (MAXACKWINDOW << sws)) && /* Acking not more than one window forward */ ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || (pd->flags & PFDESC_IP_REAS) == 0)) { /* Require an exact/+1 sequence match on resets when possible */ if (dst->scrub || src->scrub) { if (pf_normalize_tcp_stateful(m, off, pd, reason, th, *state, src, dst, copyback)) return (PF_DROP); } /* update max window */ if (src->max_win < win) src->max_win = win; /* synchronize 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 << sws), dst->seqhi)) dst->seqhi = ack + MAX((win << sws), 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; if (src->state == TCPS_ESTABLISHED && (*state)->src_node != NULL && pf_src_connlimit(state)) { REASON_SET(reason, PFRES_SRCLIMIT); return (PF_DROP); } } 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 */ (*state)->expire = time_second; if (src->state >= TCPS_FIN_WAIT_2 && dst->state >= TCPS_FIN_WAIT_2) (*state)->timeout = PFTM_TCP_CLOSED; else if (src->state >= TCPS_CLOSING && dst->state >= TCPS_CLOSING) (*state)->timeout = PFTM_TCP_FIN_WAIT; else if (src->state < TCPS_ESTABLISHED || dst->state < TCPS_ESTABLISHED) (*state)->timeout = PFTM_TCP_OPENING; else if (src->state >= TCPS_CLOSING || dst->state >= TCPS_CLOSING) (*state)->timeout = PFTM_TCP_CLOSING; else (*state)->timeout = 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 (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: loose state match: "); pf_print_state(*state); pf_print_flags(th->th_flags); printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], (unsigned long long)(*state)->packets[1], pd->dir == PF_IN ? "in" : "out", pd->dir == (*state)->direction ? "fwd" : "rev"); } if (dst->scrub || src->scrub) { if (pf_normalize_tcp_stateful(m, off, pd, reason, th, *state, src, dst, copyback)) return (PF_DROP); } /* update max window */ if (src->max_win < win) src->max_win = win; /* synchronize 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 << sws), dst->seqhi)) dst->seqhi = ack + MAX((win << sws), 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 ((*state)->dst.state == TCPS_SYN_SENT && (*state)->src.state == TCPS_SYN_SENT) { /* Send RST for state mismatches during handshake */ if (!(th->th_flags & TH_RST)) pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, pd->src, th->th_dport, th->th_sport, ntohl(th->th_ack), 0, TH_RST, 0, 0, (*state)->rule.ptr->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); src->seqlo = 0; src->seqhi = 1; src->max_win = 1; } else if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: BAD state: "); pf_print_state(*state); pf_print_flags(th->th_flags); printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len, ackskew, (unsigned long long)(*state)->packets[0], (unsigned long long)(*state)->packets[1], pd->dir == PF_IN ? "in" : "out", pd->dir == (*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 << dws)) ? ' ': '2', (ackskew >= -MAXACKWINDOW) ? ' ' : '3', (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); } REASON_SET(reason, PFRES_BADSTATE); return (PF_DROP); } return (PF_PASS); } static int pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, struct pf_state **state, struct pf_pdesc *pd, u_short *reason) { struct tcphdr *th = pd->hdr.tcp; 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; if (src->state == TCPS_ESTABLISHED && (*state)->src_node != NULL && pf_src_connlimit(state)) { REASON_SET(reason, PFRES_SRCLIMIT); return (PF_DROP); } } else if (dst->state == TCPS_CLOSING) { dst->state = TCPS_FIN_WAIT_2; } else if (src->state == TCPS_SYN_SENT && dst->state < TCPS_SYN_SENT) { /* * Handle a special sloppy case where we only see one * half of the connection. If there is a ACK after * the initial SYN without ever seeing a packet from * the destination, set the connection to established. */ dst->state = src->state = TCPS_ESTABLISHED; if ((*state)->src_node != NULL && pf_src_connlimit(state)) { REASON_SET(reason, PFRES_SRCLIMIT); return (PF_DROP); } } else if (src->state == TCPS_CLOSING && dst->state == TCPS_ESTABLISHED && dst->seqlo == 0) { /* * Handle the closing of half connections where we * don't see the full bidirectional FIN/ACK+ACK * handshake. */ dst->state = TCPS_CLOSING; } } if (th->th_flags & TH_RST) src->state = dst->state = TCPS_TIME_WAIT; /* update expire time */ (*state)->expire = time_second; if (src->state >= TCPS_FIN_WAIT_2 && dst->state >= TCPS_FIN_WAIT_2) (*state)->timeout = PFTM_TCP_CLOSED; else if (src->state >= TCPS_CLOSING && dst->state >= TCPS_CLOSING) (*state)->timeout = PFTM_TCP_FIN_WAIT; else if (src->state < TCPS_ESTABLISHED || dst->state < TCPS_ESTABLISHED) (*state)->timeout = PFTM_TCP_OPENING; else if (src->state >= TCPS_CLOSING || dst->state >= TCPS_CLOSING) (*state)->timeout = PFTM_TCP_CLOSING; else (*state)->timeout = PFTM_TCP_ESTABLISHED; return (PF_PASS); } static int pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) { struct pf_state_key_cmp key; struct tcphdr *th = pd->hdr.tcp; int copyback = 0; struct pf_state_peer *src, *dst; struct pf_state_key *sk; key.af = pd->af; key.proto = IPPROTO_TCP; if (direction == PF_IN) { /* wire side, straight */ 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; } else { /* stack side, reverse */ PF_ACPY(&key.addr[1], pd->src, key.af); PF_ACPY(&key.addr[0], pd->dst, key.af); key.port[1] = th->th_sport; key.port[0] = th->th_dport; } STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); if (direction == (*state)->direction) { src = &(*state)->src; dst = &(*state)->dst; } else { src = &(*state)->dst; dst = &(*state)->src; } sk = (*state)->key[pd->didx]; if ((*state)->src.state == PF_TCPS_PROXY_SRC) { if (direction != (*state)->direction) { REASON_SET(reason, PFRES_SYNPROXY); return (PF_SYNPROXY_DROP); } if (th->th_flags & TH_SYN) { if (ntohl(th->th_seq) != (*state)->src.seqlo) { REASON_SET(reason, PFRES_SYNPROXY); return (PF_DROP); } pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, pd->src, th->th_dport, th->th_sport, (*state)->src.seqhi, ntohl(th->th_seq) + 1, TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL, NULL); REASON_SET(reason, PFRES_SYNPROXY); return (PF_SYNPROXY_DROP); } else if (!(th->th_flags & TH_ACK) || (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { REASON_SET(reason, PFRES_SYNPROXY); return (PF_DROP); } else if ((*state)->src_node != NULL && pf_src_connlimit(state)) { REASON_SET(reason, PFRES_SRCLIMIT); return (PF_DROP); } else (*state)->src.state = PF_TCPS_PROXY_DST; } if ((*state)->src.state == PF_TCPS_PROXY_DST) { if (direction == (*state)->direction) { if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { REASON_SET(reason, PFRES_SYNPROXY); return (PF_DROP); } (*state)->src.max_win = MAX(ntohs(th->th_win), 1); if ((*state)->dst.seqhi == 1) (*state)->dst.seqhi = htonl(arc4random()); pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, &sk->addr[pd->sidx], &sk->addr[pd->didx], sk->port[pd->sidx], sk->port[pd->didx], (*state)->dst.seqhi, 0, TH_SYN, 0, (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); REASON_SET(reason, PFRES_SYNPROXY); return (PF_SYNPROXY_DROP); } else if (((th->th_flags & (TH_SYN|TH_ACK)) != (TH_SYN|TH_ACK)) || (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { REASON_SET(reason, PFRES_SYNPROXY); return (PF_DROP); } else { (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); (*state)->dst.seqlo = ntohl(th->th_seq); pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, pd->src, th->th_dport, th->th_sport, ntohl(th->th_ack), ntohl(th->th_seq) + 1, TH_ACK, (*state)->src.max_win, 0, 0, 0, (*state)->tag, NULL, NULL); pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, &sk->addr[pd->sidx], &sk->addr[pd->didx], sk->port[pd->sidx], sk->port[pd->didx], (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL, NULL); (*state)->src.seqdiff = (*state)->dst.seqhi - (*state)->src.seqlo; (*state)->dst.seqdiff = (*state)->src.seqhi - (*state)->dst.seqlo; (*state)->src.seqhi = (*state)->src.seqlo + (*state)->dst.max_win; (*state)->dst.seqhi = (*state)->dst.seqlo + (*state)->src.max_win; (*state)->src.wscale = (*state)->dst.wscale = 0; (*state)->src.state = (*state)->dst.state = TCPS_ESTABLISHED; REASON_SET(reason, PFRES_SYNPROXY); return (PF_SYNPROXY_DROP); } } if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && dst->state >= TCPS_FIN_WAIT_2 && src->state >= TCPS_FIN_WAIT_2) { if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: state reuse "); pf_print_state(*state); pf_print_flags(th->th_flags); printf("\n"); } /* XXX make sure it's the same direction ?? */ (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; pf_unlink_state(*state, 0); *state = NULL; return (PF_DROP); } if ((*state)->state_flags & PFSTATE_SLOPPY) { if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) return (PF_DROP); } else { if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, ©back) == PF_DROP) return (PF_DROP); } /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || nk->port[pd->sidx] != th->th_sport) pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx], nk->port[pd->sidx], 0, pd->af); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || nk->port[pd->didx] != th->th_dport) pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, &th->th_sum, &nk->addr[pd->didx], nk->port[pd->didx], 0, pd->af); copyback = 1; } /* Copyback sequence modulation or stateful scrub changes if needed */ if (copyback) m_copyback(m, off, sizeof(*th), (caddr_t)th); return (PF_PASS); } static int pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd) { struct pf_state_peer *src, *dst; struct pf_state_key_cmp key; struct udphdr *uh = pd->hdr.udp; key.af = pd->af; key.proto = IPPROTO_UDP; if (direction == PF_IN) { /* wire side, straight */ PF_ACPY(&key.addr[0], pd->src, key.af); PF_ACPY(&key.addr[1], pd->dst, key.af); key.port[0] = uh->uh_sport; key.port[1] = uh->uh_dport; } else { /* stack side, reverse */ PF_ACPY(&key.addr[1], pd->src, key.af); PF_ACPY(&key.addr[0], pd->dst, key.af); key.port[1] = uh->uh_sport; key.port[0] = uh->uh_dport; } STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); if (direction == (*state)->direction) { src = &(*state)->src; dst = &(*state)->dst; } else { src = &(*state)->dst; dst = &(*state)->src; } /* update states */ if (src->state < PFUDPS_SINGLE) src->state = PFUDPS_SINGLE; if (dst->state == PFUDPS_SINGLE) dst->state = PFUDPS_MULTIPLE; /* update expire time */ (*state)->expire = time_second; if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) (*state)->timeout = PFTM_UDP_MULTIPLE; else (*state)->timeout = PFTM_UDP_SINGLE; /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) || nk->port[pd->sidx] != uh->uh_sport) pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, &uh->uh_sum, &nk->addr[pd->sidx], nk->port[pd->sidx], 1, pd->af); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) || nk->port[pd->didx] != uh->uh_dport) pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, &uh->uh_sum, &nk->addr[pd->didx], nk->port[pd->didx], 1, pd->af); m_copyback(m, off, sizeof(*uh), (caddr_t)uh); } return (PF_PASS); } static int pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) { struct pf_addr *saddr = pd->src, *daddr = pd->dst; u_int16_t icmpid = 0, *icmpsum; u_int8_t icmptype; int state_icmp = 0; struct pf_state_key_cmp key; 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. */ key.af = pd->af; key.proto = pd->proto; key.port[0] = key.port[1] = icmpid; if (direction == PF_IN) { /* wire side, straight */ PF_ACPY(&key.addr[0], pd->src, key.af); PF_ACPY(&key.addr[1], pd->dst, key.af); } else { /* stack side, reverse */ PF_ACPY(&key.addr[1], pd->src, key.af); PF_ACPY(&key.addr[0], pd->dst, key.af); } STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); (*state)->expire = time_second; (*state)->timeout = PFTM_ICMP_ERROR_REPLY; /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; switch (pd->af) { #ifdef INET case AF_INET: if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) pf_change_a(&saddr->v4.s_addr, pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 0); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) pf_change_a(&daddr->v4.s_addr, pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 0); if (nk->port[0] != pd->hdr.icmp->icmp_id) { pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( pd->hdr.icmp->icmp_cksum, icmpid, nk->port[pd->sidx], 0); pd->hdr.icmp->icmp_id = nk->port[pd->sidx]; } m_copyback(m, off, ICMP_MINLEN, (caddr_t )pd->hdr.icmp); break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET6)) pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, &nk->addr[pd->sidx], 0); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET6)) pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, &nk->addr[pd->didx], 0); m_copyback(m, off, sizeof(struct icmp6_hdr), (caddr_t )pd->hdr.icmp6); break; #endif /* INET6 */ } } 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; bzero(&pd2, sizeof pd2); #ifdef INET struct ip h2; #endif /* INET */ #ifdef INET6 struct ip6_hdr h2_6; int terminal = 0; #endif /* INET6 */ int ipoff2 = 0; int off2 = 0; pd2.af = pd->af; /* Payload packet is from the opposite direction. */ pd2.sidx = (direction == PF_IN) ? 1 : 0; pd2.didx = (direction == PF_IN) ? 0 : 1; 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, reason, 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 & htons(IP_OFFMASK)) { REASON_SET(reason, PFRES_FRAG); 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, reason, 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; off2 = ipoff2 + sizeof(h2_6); do { switch (pd2.proto) { case IPPROTO_FRAGMENT: /* * ICMPv6 error messages for * non-first fragments */ REASON_SET(reason, PFRES_FRAG); return (PF_DROP); case IPPROTO_AH: case IPPROTO_HOPOPTS: case IPPROTO_ROUTING: case IPPROTO_DSTOPTS: { /* get next header and header length */ struct ip6_ext opt6; if (!pf_pull_hdr(m, off2, &opt6, sizeof(opt6), NULL, reason, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMPv6 short opt\n")); return (PF_DROP); } if (pd2.proto == IPPROTO_AH) off2 += (opt6.ip6e_len + 2) * 4; else off2 += (opt6.ip6e_len + 1) * 8; pd2.proto = opt6.ip6e_nxt; /* 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_state_peer *src, *dst; u_int8_t dws; int copyback = 0; /* * 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, reason, 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[pd2.sidx], pd2.src, key.af); PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); key.port[pd2.sidx] = th.th_sport; key.port[pd2.didx] = th.th_dport; STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); if (direction == (*state)->direction) { src = &(*state)->dst; dst = &(*state)->src; } else { src = &(*state)->src; dst = &(*state)->dst; } if (src->wscale && dst->wscale) dws = dst->wscale & PF_WSCALE_MASK; else dws = 0; /* Demodulate sequence number */ seq = ntohl(th.th_seq) - src->seqdiff; if (src->seqdiff) { pf_change_a(&th.th_seq, icmpsum, htonl(seq), 0); copyback = 1; } if (!((*state)->state_flags & PFSTATE_SLOPPY) && (!SEQ_GEQ(src->seqhi, seq) || !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: BAD ICMP %d:%d ", icmptype, pd->hdr.icmp->icmp_code); pf_print_host(pd->src, 0, pd->af); printf(" -> "); pf_print_host(pd->dst, 0, pd->af); printf(" state: "); pf_print_state(*state); printf(" seq=%u\n", seq); } REASON_SET(reason, PFRES_BADSTATE); return (PF_DROP); } else { if (V_pf_status.debug >= PF_DEBUG_MISC) { printf("pf: OK ICMP %d:%d ", icmptype, pd->hdr.icmp->icmp_code); pf_print_host(pd->src, 0, pd->af); printf(" -> "); pf_print_host(pd->dst, 0, pd->af); printf(" state: "); pf_print_state(*state); printf(" seq=%u\n", seq); } } /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || nk->port[pd2.sidx] != th.th_sport) pf_change_icmp(pd2.src, &th.th_sport, daddr, &nk->addr[pd2.sidx], nk->port[pd2.sidx], NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, pd2.af); if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx], pd2.af) || nk->port[pd2.didx] != th.th_dport) pf_change_icmp(pd2.dst, &th.th_dport, NULL, /* XXX Inbound NAT? */ &nk->addr[pd2.didx], nk->port[pd2.didx], NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, pd2.af); copyback = 1; } if (copyback) { 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, sizeof(struct icmp6_hdr), (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); } return (PF_PASS); break; } case IPPROTO_UDP: { struct udphdr uh; if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), NULL, reason, 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[pd2.sidx], pd2.src, key.af); PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); key.port[pd2.sidx] = uh.uh_sport; key.port[pd2.didx] = uh.uh_dport; STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || nk->port[pd2.sidx] != uh.uh_sport) pf_change_icmp(pd2.src, &uh.uh_sport, daddr, &nk->addr[pd2.sidx], nk->port[pd2.sidx], &uh.uh_sum, pd2.ip_sum, icmpsum, pd->ip_sum, 1, pd2.af); if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx], pd2.af) || nk->port[pd2.didx] != uh.uh_dport) pf_change_icmp(pd2.dst, &uh.uh_dport, NULL, /* XXX Inbound NAT? */ &nk->addr[pd2.didx], nk->port[pd2.didx], &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, sizeof(struct icmp6_hdr), (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; if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, NULL, reason, pd2.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: ICMP error message too short i" "(icmp)\n")); return (PF_DROP); } key.af = pd2.af; key.proto = IPPROTO_ICMP; PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); key.port[0] = key.port[1] = iih.icmp_id; STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || nk->port[pd2.sidx] != iih.icmp_id) pf_change_icmp(pd2.src, &iih.icmp_id, daddr, &nk->addr[pd2.sidx], nk->port[pd2.sidx], NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET); if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx], pd2.af) || nk->port[pd2.didx] != iih.icmp_id) pf_change_icmp(pd2.dst, &iih.icmp_id, NULL, /* XXX Inbound NAT? */ &nk->addr[pd2.didx], nk->port[pd2.didx], 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; if (!pf_pull_hdr(m, off2, &iih, sizeof(struct icmp6_hdr), NULL, reason, 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[pd2.sidx], pd2.src, key.af); PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); key.port[0] = key.port[1] = iih.icmp6_id; STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af) || nk->port[pd2.sidx] != iih.icmp6_id) pf_change_icmp(pd2.src, &iih.icmp6_id, daddr, &nk->addr[pd2.sidx], nk->port[pd2.sidx], NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET6); if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx], pd2.af) || nk->port[pd2.didx] != iih.icmp6_id) pf_change_icmp(pd2.dst, &iih.icmp6_id, NULL, /* XXX Inbound NAT? */ &nk->addr[pd2.didx], nk->port[pd2.didx], NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, AF_INET6); m_copyback(m, off, sizeof(struct icmp6_hdr), (caddr_t)pd->hdr.icmp6); m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6); m_copyback(m, off2, sizeof(struct icmp6_hdr), (caddr_t)&iih); } return (PF_PASS); break; } #endif /* INET6 */ default: { key.af = pd2.af; key.proto = pd2.proto; PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af); PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af); key.port[0] = key.port[1] = 0; STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; if (PF_ANEQ(pd2.src, &nk->addr[pd2.sidx], pd2.af)) pf_change_icmp(pd2.src, NULL, daddr, &nk->addr[pd2.sidx], 0, NULL, pd2.ip_sum, icmpsum, pd->ip_sum, 0, pd2.af); if (PF_ANEQ(pd2.dst, &nk->addr[pd2.didx], pd2.af)) pf_change_icmp(pd2.src, NULL, NULL, /* XXX Inbound NAT? */ &nk->addr[pd2.didx], 0, 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, sizeof(struct icmp6_hdr), (caddr_t )pd->hdr.icmp6); m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t )&h2_6); break; #endif /* INET6 */ } } return (PF_PASS); break; } } } } static int pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, struct mbuf *m, struct pf_pdesc *pd) { struct pf_state_peer *src, *dst; struct pf_state_key_cmp key; key.af = pd->af; key.proto = pd->proto; if (direction == PF_IN) { PF_ACPY(&key.addr[0], pd->src, key.af); PF_ACPY(&key.addr[1], pd->dst, key.af); key.port[0] = key.port[1] = 0; } else { PF_ACPY(&key.addr[1], pd->src, key.af); PF_ACPY(&key.addr[0], pd->dst, key.af); key.port[1] = key.port[0] = 0; } STATE_LOOKUP(kif, &key, direction, *state, m, pd->pf_mtag); if (direction == (*state)->direction) { src = &(*state)->src; dst = &(*state)->dst; } else { src = &(*state)->dst; dst = &(*state)->src; } /* update states */ if (src->state < PFOTHERS_SINGLE) src->state = PFOTHERS_SINGLE; if (dst->state == PFOTHERS_SINGLE) dst->state = PFOTHERS_MULTIPLE; /* update expire time */ (*state)->expire = time_second; if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) (*state)->timeout = PFTM_OTHER_MULTIPLE; else (*state)->timeout = PFTM_OTHER_SINGLE; /* translate source/destination address, if necessary */ if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) { struct pf_state_key *nk = (*state)->key[pd->didx]; KASSERT(nk, ("%s: nk is null", __func__)); KASSERT(pd, ("%s: pd is null", __func__)); KASSERT(pd->src, ("%s: pd->src is null", __func__)); KASSERT(pd->dst, ("%s: pd->dst is null", __func__)); switch (pd->af) { #ifdef INET case AF_INET: if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) pf_change_a(&pd->src->v4.s_addr, pd->ip_sum, nk->addr[pd->sidx].v4.s_addr, 0); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) pf_change_a(&pd->dst->v4.s_addr, pd->ip_sum, nk->addr[pd->didx].v4.s_addr, 0); break; #endif /* INET */ #ifdef INET6 case AF_INET6: if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET)) PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af); if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET)) PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af); #endif /* INET6 */ } } return (PF_PASS); } /* * 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, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: { struct ip *h = mtod(m, struct ip *); u_int16_t fragoff = (ntohs(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 || ntohs(h->ip_len) < off + len) { ACTION_SET(actionp, PF_DROP); REASON_SET(reasonp, PFRES_SHORT); return (NULL); } break; } #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)) < (unsigned)(off + len)) { ACTION_SET(actionp, PF_DROP); REASON_SET(reasonp, PFRES_SHORT); return (NULL); } break; } #endif /* INET6 */ } m_copydata(m, off, len, p); return (p); } int pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif, int rtableid) { #ifdef RADIX_MPATH struct radix_node_head *rnh; #endif struct sockaddr_in *dst; int ret = 1; int check_mpath; #ifdef INET6 struct sockaddr_in6 *dst6; struct route_in6 ro; #else struct route ro; #endif struct radix_node *rn; struct rtentry *rt; struct ifnet *ifp; check_mpath = 0; #ifdef RADIX_MPATH /* XXX: stick to table 0 for now */ rnh = rt_tables_get_rnh(0, af); if (rnh != NULL && rn_mpath_capable(rnh)) check_mpath = 1; #endif bzero(&ro, sizeof(ro)); switch (af) { case AF_INET: dst = satosin(&ro.ro_dst); dst->sin_family = AF_INET; dst->sin_len = sizeof(*dst); dst->sin_addr = addr->v4; break; #ifdef INET6 case AF_INET6: /* * Skip check for addresses with embedded interface scope, * as they would always match anyway. */ if (IN6_IS_SCOPE_EMBED(&addr->v6)) goto out; dst6 = (struct sockaddr_in6 *)&ro.ro_dst; dst6->sin6_family = AF_INET6; dst6->sin6_len = sizeof(*dst6); dst6->sin6_addr = addr->v6; break; #endif /* INET6 */ default: return (0); } /* Skip checks for ipsec interfaces */ if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) goto out; switch (af) { #ifdef INET6 case AF_INET6: in6_rtalloc_ign(&ro, 0, rtableid); break; #endif #ifdef INET case AF_INET: in_rtalloc_ign((struct route *)&ro, 0, rtableid); break; #endif default: rtalloc_ign((struct route *)&ro, 0); /* No/default FIB. */ break; } if (ro.ro_rt != NULL) { /* No interface given, this is a no-route check */ if (kif == NULL) goto out; if (kif->pfik_ifp == NULL) { ret = 0; goto out; } /* Perform uRPF check if passed input interface */ ret = 0; rn = (struct radix_node *)ro.ro_rt; do { rt = (struct rtentry *)rn; ifp = rt->rt_ifp; if (kif->pfik_ifp == ifp) ret = 1; #ifdef RADIX_MPATH rn = rn_mpath_next(rn); #endif } while (check_mpath == 1 && rn != NULL && ret == 0); } else ret = 0; out: if (ro.ro_rt != NULL) RTFREE(ro.ro_rt); return (ret); } int pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw, int rtableid) { struct sockaddr_in *dst; #ifdef INET6 struct sockaddr_in6 *dst6; struct route_in6 ro; #else struct route ro; #endif int ret = 0; bzero(&ro, sizeof(ro)); switch (af) { case AF_INET: dst = satosin(&ro.ro_dst); dst->sin_family = AF_INET; dst->sin_len = sizeof(*dst); dst->sin_addr = addr->v4; break; #ifdef INET6 case AF_INET6: dst6 = (struct sockaddr_in6 *)&ro.ro_dst; dst6->sin6_family = AF_INET6; dst6->sin6_len = sizeof(*dst6); dst6->sin6_addr = addr->v6; break; #endif /* INET6 */ default: return (0); } switch (af) { #ifdef INET6 case AF_INET6: in6_rtalloc_ign(&ro, 0, rtableid); break; #endif #ifdef INET case AF_INET: in_rtalloc_ign((struct route *)&ro, 0, rtableid); break; #endif default: rtalloc_ign((struct route *)&ro, 0); break; } if (ro.ro_rt != NULL) { #if 0 /* XXX_IMPORT: later */ if (ro.ro_rt->rt_labelid == aw->v.rtlabel) ret = 1; #endif RTFREE(ro.ro_rt); } return (ret); } #ifdef INET static void pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, struct pf_state *s, struct pf_pdesc *pd) { struct mbuf *m0, *m1; struct route iproute; struct route *ro = NULL; struct sockaddr_in *dst; struct ip *ip; struct ifnet *ifp = NULL; struct pf_addr naddr; struct pf_src_node *sn = NULL; int error = 0; int sw_csum; #ifdef IPSEC struct m_tag *mtag; #endif /* IPSEC */ if (m == NULL || *m == NULL || r == NULL || (dir != PF_IN && dir != PF_OUT) || oifp == NULL) panic("pf_route: invalid parameters"); if (pd->pf_mtag->routed++ > 3) { m0 = *m; *m = NULL; goto bad; } if (r->rt == PF_DUPTO) { if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) return; } else { if ((r->rt == PF_REPLYTO) == (r->direction == dir)) return; m0 = *m; } if (m0->m_len < sizeof(struct ip)) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_route: m0->m_len < sizeof(struct ip)\n")); goto bad; } ip = mtod(m0, struct ip *); ro = &iproute; bzero((caddr_t)ro, sizeof(*ro)); dst = satosin(&ro->ro_dst); dst->sin_family = AF_INET; dst->sin_len = sizeof(*dst); dst->sin_addr = ip->ip_dst; if (r->rt == PF_FASTROUTE) { in_rtalloc_ign(ro, 0, M_GETFIB(m0)); if (ro->ro_rt == 0) { KMOD_IPSTAT_INC(ips_noroute); goto bad; } ifp = ro->ro_rt->rt_ifp; ro->ro_rt->rt_use++; if (ro->ro_rt->rt_flags & RTF_GATEWAY) dst = satosin(ro->ro_rt->rt_gateway); } else { if (TAILQ_EMPTY(&r->rpool.list)) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); goto bad; } if (s == NULL) { pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, &naddr, NULL, &sn); if (!PF_AZERO(&naddr, AF_INET)) dst->sin_addr.s_addr = naddr.v4.s_addr; ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; } else { if (!PF_AZERO(&s->rt_addr, AF_INET)) dst->sin_addr.s_addr = s->rt_addr.v4.s_addr; ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; } } if (ifp == NULL) goto bad; if (oifp != ifp) { PF_UNLOCK(); if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { PF_LOCK(); goto bad; } else if (m0 == NULL) { PF_LOCK(); goto done; } PF_LOCK(); if (m0->m_len < sizeof(struct ip)) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_route: m0->m_len < sizeof(struct ip)\n")); goto bad; } ip = mtod(m0, struct ip *); } /* Copied from FreeBSD 5.1-CURRENT ip_output. */ m0->m_pkthdr.csum_flags |= CSUM_IP; sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; if (sw_csum & CSUM_DELAY_DATA) { /* * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) */ NTOHS(ip->ip_len); NTOHS(ip->ip_off); /* XXX: needed? */ in_delayed_cksum(m0); HTONS(ip->ip_len); HTONS(ip->ip_off); sw_csum &= ~CSUM_DELAY_DATA; } m0->m_pkthdr.csum_flags &= ifp->if_hwassist; if (ntohs(ip->ip_len) <= ifp->if_mtu || (ifp->if_hwassist & CSUM_FRAGMENT && ((ip->ip_off & htons(IP_DF)) == 0))) { /* * ip->ip_len = htons(ip->ip_len); * ip->ip_off = htons(ip->ip_off); */ ip->ip_sum = 0; if (sw_csum & CSUM_DELAY_IP) { /* From KAME */ if (ip->ip_v == IPVERSION && (ip->ip_hl << 2) == sizeof(*ip)) { ip->ip_sum = in_cksum_hdr(ip); } else { ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); } } PF_UNLOCK(); error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro); PF_LOCK(); goto done; } /* * Too large for interface; fragment if possible. * Must be able to put at least 8 bytes per fragment. */ if (ip->ip_off & htons(IP_DF)) { KMOD_IPSTAT_INC(ips_cantfrag); if (r->rt != PF_DUPTO) { /* icmp_error() expects host byte ordering */ NTOHS(ip->ip_len); NTOHS(ip->ip_off); PF_UNLOCK(); icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, ifp->if_mtu); PF_LOCK(); goto done; } else goto bad; } m1 = m0; /* * XXX: is cheaper + less error prone than own function */ NTOHS(ip->ip_len); NTOHS(ip->ip_off); error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); if (error) goto bad; for (m0 = m1; m0; m0 = m1) { m1 = m0->m_nextpkt; m0->m_nextpkt = 0; if (error == 0) { PF_UNLOCK(); error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); PF_LOCK(); } else m_freem(m0); } if (error == 0) KMOD_IPSTAT_INC(ips_fragmented); done: if (r->rt != PF_DUPTO) *m = NULL; if (ro == &iproute && ro->ro_rt) RTFREE(ro->ro_rt); return; bad: m_freem(m0); goto done; } #endif /* INET */ #ifdef INET6 static void pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, struct pf_state *s, struct pf_pdesc *pd) { struct mbuf *m0; struct route_in6 ip6route; struct route_in6 *ro; struct sockaddr_in6 *dst; struct ip6_hdr *ip6; struct ifnet *ifp = NULL; struct pf_addr naddr; struct pf_src_node *sn = NULL; if (m == NULL || *m == NULL || r == NULL || (dir != PF_IN && dir != PF_OUT) || oifp == NULL) panic("pf_route6: invalid parameters"); if (pd->pf_mtag->routed++ > 3) { m0 = *m; *m = NULL; goto bad; } if (r->rt == PF_DUPTO) { if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) return; } else { if ((r->rt == PF_REPLYTO) == (r->direction == dir)) return; m0 = *m; } if (m0->m_len < sizeof(struct ip6_hdr)) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); goto bad; } ip6 = mtod(m0, struct ip6_hdr *); ro = &ip6route; bzero((caddr_t)ro, sizeof(*ro)); dst = (struct sockaddr_in6 *)&ro->ro_dst; dst->sin6_family = AF_INET6; dst->sin6_len = sizeof(*dst); dst->sin6_addr = ip6->ip6_dst; /* Cheat. XXX why only in the v6 case??? */ if (r->rt == PF_FASTROUTE) { m0->m_flags |= M_SKIP_FIREWALL; PF_UNLOCK(); ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); return; } if (TAILQ_EMPTY(&r->rpool.list)) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); goto bad; } if (s == NULL) { pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, &naddr, NULL, &sn); if (!PF_AZERO(&naddr, AF_INET6)) PF_ACPY((struct pf_addr *)&dst->sin6_addr, &naddr, AF_INET6); ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; } else { if (!PF_AZERO(&s->rt_addr, AF_INET6)) PF_ACPY((struct pf_addr *)&dst->sin6_addr, &s->rt_addr, AF_INET6); ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; } if (ifp == NULL) goto bad; if (oifp != ifp) { PF_UNLOCK(); if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { PF_LOCK(); goto bad; } else if (m0 == NULL) { PF_LOCK(); goto done; } PF_LOCK(); if (m0->m_len < sizeof(struct ip6_hdr)) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); goto bad; } ip6 = mtod(m0, struct ip6_hdr *); } /* * If the packet is too large for the outgoing interface, * send back an icmp6 error. */ if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr)) dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { PF_UNLOCK(); nd6_output(ifp, ifp, m0, dst, NULL); PF_LOCK(); } else { in6_ifstat_inc(ifp, ifs6_in_toobig); if (r->rt != PF_DUPTO) { PF_UNLOCK(); icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); PF_LOCK(); } else goto bad; } done: if (r->rt != PF_DUPTO) *m = NULL; return; bad: m_freem(m0); goto done; } #endif /* INET6 */ /* * FreeBSD supports cksum offloads for the following drivers. * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), * ti(4), txp(4), xl(4) * * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : * network driver performed cksum including pseudo header, need to verify * csum_data * CSUM_DATA_VALID : * network driver performed cksum, needs to additional pseudo header * cksum computation with partial csum_data(i.e. lack of H/W support for * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) * * After validating the cksum of packet, set both flag CSUM_DATA_VALID and * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper * TCP/UDP layer. * Also, set csum_data to 0xffff to force cksum validation. */ static int pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) { u_int16_t sum = 0; int hw_assist = 0; struct ip *ip; if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) return (1); if (m->m_pkthdr.len < off + len) return (1); switch (p) { case IPPROTO_TCP: if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { sum = m->m_pkthdr.csum_data; } else { ip = mtod(m, struct ip *); sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, htonl((u_short)len + m->m_pkthdr.csum_data + IPPROTO_TCP)); } sum ^= 0xffff; ++hw_assist; } break; case IPPROTO_UDP: if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { sum = m->m_pkthdr.csum_data; } else { ip = mtod(m, struct ip *); sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, htonl((u_short)len + m->m_pkthdr.csum_data + IPPROTO_UDP)); } sum ^= 0xffff; ++hw_assist; } break; case IPPROTO_ICMP: #ifdef INET6 case IPPROTO_ICMPV6: #endif /* INET6 */ break; default: return (1); } if (!hw_assist) { switch (af) { case AF_INET: if (p == IPPROTO_ICMP) { if (m->m_len < off) return (1); m->m_data += off; m->m_len -= off; sum = in_cksum(m, len); m->m_data -= off; m->m_len += off; } else { if (m->m_len < sizeof(struct ip)) return (1); sum = in4_cksum(m, p, off, len); } break; #ifdef INET6 case AF_INET6: if (m->m_len < sizeof(struct ip6_hdr)) return (1); sum = in6_cksum(m, p, off, len); break; #endif /* INET6 */ default: return (1); } } if (sum) { switch (p) { case IPPROTO_TCP: { KMOD_TCPSTAT_INC(tcps_rcvbadsum); break; } case IPPROTO_UDP: { KMOD_UDPSTAT_INC(udps_badsum); break; } #ifdef INET case IPPROTO_ICMP: { KMOD_ICMPSTAT_INC(icps_checksum); break; } #endif #ifdef INET6 case IPPROTO_ICMPV6: { KMOD_ICMP6STAT_INC(icp6s_checksum); break; } #endif /* INET6 */ } return (1); } else { if (p == IPPROTO_TCP || p == IPPROTO_UDP) { m->m_pkthdr.csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); m->m_pkthdr.csum_data = 0xffff; } } return (0); } #ifdef INET int pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct ether_header *eh, struct inpcb *inp) { struct pfi_kif *kif; u_short action, reason = 0, log = 0; struct mbuf *m = *m0; struct ip *h = NULL; struct m_tag *ipfwtag; struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; struct pf_state *s = NULL; struct pf_ruleset *ruleset = NULL; struct pf_pdesc pd; int off, dirndx, pqid = 0; M_ASSERTPKTHDR(m); if (!V_pf_status.running) return (PF_PASS); memset(&pd, 0, sizeof(pd)); if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_test: pf_get_mtag returned NULL\n")); return (PF_DROP); } kif = (struct pfi_kif *)ifp->if_pf_kif; if (kif == NULL) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); return (PF_DROP); } if (kif->pfik_flags & PFI_IFLAG_SKIP) return (PF_PASS); if (m->m_flags & M_SKIP_FIREWALL) return (PF_PASS); if (m->m_pkthdr.len < (int)sizeof(struct ip)) { action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); log = 1; PF_LOCK(); goto done; } PF_LOCK(); PF_RULES_RLOCK(); if (ip_divert_ptr != NULL && ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) { struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1); if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) { pd.pf_mtag->flags |= PF_PACKET_LOOPED; m_tag_delete(m, ipfwtag); } if (pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) { m->m_flags |= M_FASTFWD_OURS; pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT; } } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { /* We do IP header normalization and packet reassembly here */ action = PF_DROP; goto done; } m = *m0; /* pf_normalize messes with m0 */ h = mtod(m, struct ip *); off = h->ip_hl << 2; if (off < (int)sizeof(struct ip)) { 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.sport = pd.dport = NULL; pd.ip_sum = &h->ip_sum; pd.proto_sum = NULL; pd.proto = h->ip_p; pd.dir = dir; pd.sidx = (dir == PF_IN) ? 0 : 1; pd.didx = (dir == PF_IN) ? 1 : 0; pd.af = AF_INET; pd.tos = h->ip_tos; pd.tot_len = ntohs(h->ip_len); pd.eh = eh; /* handle fragments that didn't get reassembled by normalization */ if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { action = pf_test_fragment(&r, dir, kif, m, h, &pd, &a, &ruleset); goto done; } 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); if ((th.th_flags & TH_ACK) && pd.p_len == 0) pqid = 1; action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); if (action == PF_DROP) goto done; action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, &reason); if (action == PF_PASS) { if (pfsync_update_state_ptr != NULL) pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, h, &pd, &a, &ruleset, NULL, inp); 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; } if (uh.uh_dport == 0 || ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); goto done; } action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); if (action == PF_PASS) { if (pfsync_update_state_ptr != NULL) pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, h, &pd, &a, &ruleset, NULL, inp); 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, kif, m, off, h, &pd, &reason); if (action == PF_PASS) { if (pfsync_update_state_ptr != NULL) pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, h, &pd, &a, &ruleset, NULL, inp); break; } #ifdef INET6 case IPPROTO_ICMPV6: { action = PF_DROP; DPFPRINTF(PF_DEBUG_MISC, ("pf: dropping IPv4 packet with ICMPv6 payload\n")); goto done; } #endif default: action = pf_test_state_other(&s, dir, kif, m, &pd); if (action == PF_PASS) { if (pfsync_update_state_ptr != NULL) pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, h, &pd, &a, &ruleset, NULL, inp); break; } done: if (action == PF_PASS && h->ip_hl > 5 && !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { action = PF_DROP; REASON_SET(&reason, PFRES_IPOPTIONS); log = 1; DPFPRINTF(PF_DEBUG_MISC, ("pf: dropping packet with ip options\n")); } if ((s && s->tag) || r->rtableid >= 0) pf_tag_packet(m, s ? s->tag : 0, r->rtableid, pd.pf_mtag); if (dir == PF_IN && s && s->key[PF_SK_STACK]) pd.pf_mtag->statekey = s->key[PF_SK_STACK]; #ifdef ALTQ if (action == PF_PASS && r->qid) { if (pqid || (pd.tos & IPTOS_LOWDELAY)) pd.pf_mtag->qid = r->pqid; else pd.pf_mtag->qid = r->qid; /* add hints for ecn */ pd.pf_mtag->hdr = h; } #endif /* ALTQ */ /* * connections redirected to loopback should not match sockets * bound specifically to loopback due to security implications, * see tcp_input() and in_pcblookup_listen(). */ if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && (s->nat_rule.ptr->action == PF_RDR || s->nat_rule.ptr->action == PF_BINAT) && (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) m->m_flags |= M_SKIP_FIREWALL; if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL && !PACKET_LOOPED()) { ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0, sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO); if (ipfwtag != NULL) { ((struct ipfw_rule_ref *)(ipfwtag+1))->info = ntohs(r->divert.port); ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir; PF_RULES_RUNLOCK(); PF_UNLOCK(); m_tag_prepend(m, ipfwtag); if (m->m_flags & M_FASTFWD_OURS) { pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT; m->m_flags &= ~M_FASTFWD_OURS; } ip_divert_ptr(*m0, dir == PF_IN ? DIR_IN : DIR_OUT); *m0 = NULL; return (action); } else { /* XXX: ipfw has the same behaviour! */ action = PF_DROP; REASON_SET(&reason, PFRES_MEMORY); log = 1; DPFPRINTF(PF_DEBUG_MISC, ("pf: failed to allocate divert tag\n")); } } if (log) { struct pf_rule *lr; if (s != NULL && s->nat_rule.ptr != NULL && s->nat_rule.ptr->log & PF_LOG_ALL) lr = s->nat_rule.ptr; else lr = r; PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, &pd); } kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; if (action == PF_PASS || r->action == PF_DROP) { dirndx = (dir == PF_OUT); r->packets[dirndx]++; r->bytes[dirndx] += pd.tot_len; if (a != NULL) { a->packets[dirndx]++; a->bytes[dirndx] += pd.tot_len; } if (s != NULL) { if (s->nat_rule.ptr != NULL) { s->nat_rule.ptr->packets[dirndx]++; s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; } if (s->src_node != NULL) { s->src_node->packets[dirndx]++; s->src_node->bytes[dirndx] += pd.tot_len; } if (s->nat_src_node != NULL) { s->nat_src_node->packets[dirndx]++; s->nat_src_node->bytes[dirndx] += pd.tot_len; } dirndx = (dir == s->direction) ? 0 : 1; s->packets[dirndx]++; s->bytes[dirndx] += pd.tot_len; } tr = r; nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; if (nr != NULL && r == &V_pf_default_rule) tr = nr; if (tr->src.addr.type == PF_ADDR_TABLE) pfr_update_stats(tr->src.addr.p.tbl, (s == NULL) ? pd.src : &s->key[(s->direction == PF_IN)]-> addr[(s->direction == PF_OUT)], pd.af, pd.tot_len, dir == PF_OUT, r->action == PF_PASS, tr->src.neg); if (tr->dst.addr.type == PF_ADDR_TABLE) pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL) ? pd.dst : &s->key[(s->direction == PF_IN)]-> addr[(s->direction == PF_IN)], pd.af, pd.tot_len, dir == PF_OUT, r->action == PF_PASS, tr->dst.neg); } switch (action) { case PF_SYNPROXY_DROP: m_freem(*m0); case PF_DEFER: *m0 = NULL; action = PF_PASS; break; default: /* pf_route can free the mbuf causing *m0 to become NULL */ if (r->rt) pf_route(m0, r, dir, kif->pfik_ifp, s, &pd); break; } PF_RULES_RUNLOCK(); PF_UNLOCK(); return (action); } #endif /* INET */ #ifdef INET6 int pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct ether_header *eh, struct inpcb *inp) { struct pfi_kif *kif; u_short action, reason = 0, log = 0; struct mbuf *m = *m0, *n = NULL; struct ip6_hdr *h = NULL; struct pf_rule *a = NULL, *r = &V_pf_default_rule, *tr, *nr; struct pf_state *s = NULL; struct pf_ruleset *ruleset = NULL; struct pf_pdesc pd; int off, terminal = 0, dirndx, rh_cnt = 0; M_ASSERTPKTHDR(m); if (!V_pf_status.running) return (PF_PASS); memset(&pd, 0, sizeof(pd)); if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_test: pf_get_mtag returned NULL\n")); return (PF_DROP); } if (pd.pf_mtag->flags & PF_TAG_GENERATED) return (PF_PASS); kif = (struct pfi_kif *)ifp->if_pf_kif; if (kif == NULL) { DPFPRINTF(PF_DEBUG_URGENT, ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); return (PF_DROP); } if (kif->pfik_flags & PFI_IFLAG_SKIP) return (PF_PASS); if (m->m_pkthdr.len < (int)sizeof(*h)) { action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); log = 1; PF_LOCK(); goto done; } PF_LOCK(); PF_RULES_RLOCK(); /* We do IP header normalization and packet reassembly here */ if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { action = PF_DROP; goto done; } m = *m0; /* pf_normalize messes with m0 */ h = mtod(m, struct ip6_hdr *); #if 1 /* * we do not support jumbogram yet. if we keep going, zero ip6_plen * will do something bad, so drop the packet for now. */ if (htons(h->ip6_plen) == 0) { action = PF_DROP; REASON_SET(&reason, PFRES_NORM); /*XXX*/ goto done; } #endif pd.src = (struct pf_addr *)&h->ip6_src; pd.dst = (struct pf_addr *)&h->ip6_dst; pd.sport = pd.dport = NULL; pd.ip_sum = NULL; pd.proto_sum = NULL; pd.dir = dir; pd.sidx = (dir == PF_IN) ? 0 : 1; pd.didx = (dir == PF_IN) ? 1 : 0; pd.af = AF_INET6; pd.tos = 0; pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); pd.eh = eh; off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); pd.proto = h->ip6_nxt; do { switch (pd.proto) { case IPPROTO_FRAGMENT: action = pf_test_fragment(&r, dir, kif, m, h, &pd, &a, &ruleset); if (action == PF_DROP) REASON_SET(&reason, PFRES_FRAG); goto done; case IPPROTO_ROUTING: { struct ip6_rthdr rthdr; if (rh_cnt++) { DPFPRINTF(PF_DEBUG_MISC, ("pf: IPv6 more than one rthdr\n")); action = PF_DROP; REASON_SET(&reason, PFRES_IPOPTIONS); log = 1; goto done; } if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, &reason, pd.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: IPv6 short rthdr\n")); action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); log = 1; goto done; } if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { DPFPRINTF(PF_DEBUG_MISC, ("pf: IPv6 rthdr0\n")); action = PF_DROP; REASON_SET(&reason, PFRES_IPOPTIONS); log = 1; goto done; } /* FALLTHROUGH */ } case IPPROTO_AH: case IPPROTO_HOPOPTS: case IPPROTO_DSTOPTS: { /* get next header and header length */ struct ip6_ext opt6; if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), NULL, &reason, pd.af)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: IPv6 short opt\n")); action = PF_DROP; log = 1; goto done; } if (pd.proto == IPPROTO_AH) off += (opt6.ip6e_len + 2) * 4; else off += (opt6.ip6e_len + 1) * 8; pd.proto = opt6.ip6e_nxt; /* goto the next header */ break; } default: terminal++; break; } } while (!terminal); /* if there's no routing header, use unmodified mbuf for checksumming */ if (!n) n = m; 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, kif, m, 0, off, h, &pd); if (action == PF_DROP) goto done; action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, &reason); if (action == PF_PASS) { if (pfsync_update_state_ptr != NULL) pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, h, &pd, &a, &ruleset, NULL, inp); 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; } if (uh.uh_dport == 0 || ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { action = PF_DROP; REASON_SET(&reason, PFRES_SHORT); goto done; } action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); if (action == PF_PASS) { if (pfsync_update_state_ptr != NULL) pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, h, &pd, &a, &ruleset, NULL, inp); break; } case IPPROTO_ICMP: { action = PF_DROP; DPFPRINTF(PF_DEBUG_MISC, ("pf: dropping IPv6 packet with ICMPv4 payload\n")); goto done; } 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, kif, m, off, h, &pd, &reason); if (action == PF_PASS) { if (pfsync_update_state_ptr != NULL) pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, h, &pd, &a, &ruleset, NULL, inp); break; } default: action = pf_test_state_other(&s, dir, kif, m, &pd); if (action == PF_PASS) { if (pfsync_update_state_ptr != NULL) pfsync_update_state_ptr(s); r = s->rule.ptr; a = s->anchor.ptr; log = s->log; } else if (s == NULL) action = pf_test_rule(&r, &s, dir, kif, m, off, h, &pd, &a, &ruleset, NULL, inp); break; } done: if (n != m) { m_freem(n); n = NULL; } /* handle dangerous IPv6 extension headers. */ if (action == PF_PASS && rh_cnt && !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { action = PF_DROP; REASON_SET(&reason, PFRES_IPOPTIONS); log = 1; DPFPRINTF(PF_DEBUG_MISC, ("pf: dropping packet with dangerous v6 headers\n")); } if ((s && s->tag) || r->rtableid >= 0) pf_tag_packet(m, s ? s->tag : 0, r->rtableid, pd.pf_mtag); if (dir == PF_IN && s && s->key[PF_SK_STACK]) pd.pf_mtag->statekey = s->key[PF_SK_STACK]; #ifdef ALTQ if (action == PF_PASS && r->qid) { if (pd.tos & IPTOS_LOWDELAY) pd.pf_mtag->qid = r->pqid; else pd.pf_mtag->qid = r->qid; /* add hints for ecn */ pd.pf_mtag->hdr = h; } #endif /* ALTQ */ if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && (s->nat_rule.ptr->action == PF_RDR || s->nat_rule.ptr->action == PF_BINAT) && IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) m->m_flags |= M_SKIP_FIREWALL; /* XXX: Anybody working on it?! */ if (r->divert.port) printf("pf: divert(9) is not supported for IPv6\n"); if (log) { struct pf_rule *lr; if (s != NULL && s->nat_rule.ptr != NULL && s->nat_rule.ptr->log & PF_LOG_ALL) lr = s->nat_rule.ptr; else lr = r; PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, &pd); } kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; if (action == PF_PASS || r->action == PF_DROP) { dirndx = (dir == PF_OUT); r->packets[dirndx]++; r->bytes[dirndx] += pd.tot_len; if (a != NULL) { a->packets[dirndx]++; a->bytes[dirndx] += pd.tot_len; } if (s != NULL) { if (s->nat_rule.ptr != NULL) { s->nat_rule.ptr->packets[dirndx]++; s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; } if (s->src_node != NULL) { s->src_node->packets[dirndx]++; s->src_node->bytes[dirndx] += pd.tot_len; } if (s->nat_src_node != NULL) { s->nat_src_node->packets[dirndx]++; s->nat_src_node->bytes[dirndx] += pd.tot_len; } dirndx = (dir == s->direction) ? 0 : 1; s->packets[dirndx]++; s->bytes[dirndx] += pd.tot_len; } tr = r; nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; if (nr != NULL && r == &V_pf_default_rule) tr = nr; if (tr->src.addr.type == PF_ADDR_TABLE) pfr_update_stats(tr->src.addr.p.tbl, (s == NULL) ? pd.src : &s->key[(s->direction == PF_IN)]->addr[0], pd.af, pd.tot_len, dir == PF_OUT, r->action == PF_PASS, tr->src.neg); if (tr->dst.addr.type == PF_ADDR_TABLE) pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL) ? pd.dst : &s->key[(s->direction == PF_IN)]->addr[1], pd.af, pd.tot_len, dir == PF_OUT, r->action == PF_PASS, tr->dst.neg); } switch (action) { case PF_SYNPROXY_DROP: m_freem(*m0); case PF_DEFER: *m0 = NULL; action = PF_PASS; break; default: /* pf_route6 can free the mbuf causing *m0 to become NULL */ if (r->rt) pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd); break; } PF_RULES_RUNLOCK(); PF_UNLOCK(); return (action); } #endif /* INET6 */ static int pf_check_congestion(struct ifqueue *ifq) { /* XXX_IMPORT: later */ return (0); } Index: projects/pf/head/sys/contrib/pf/net/pf_ioctl.c =================================================================== --- projects/pf/head/sys/contrib/pf/net/pf_ioctl.c (revision 232604) +++ projects/pf/head/sys/contrib/pf/net/pf_ioctl.c (revision 232605) @@ -1,3627 +1,3628 @@ /* $OpenBSD: pf_ioctl.c,v 1.213 2009/02/15 21:46:12 mbalmer Exp $ */ /* * Copyright (c) 2001 Daniel Hartmeier * Copyright (c) 2002,2003 Henning Brauer * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * Effort sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F30602-01-2-0537. * */ #include __FBSDID("$FreeBSD$"); #include "opt_inet.h" #include "opt_inet6.h" #include "opt_bpf.h" #include "opt_pf.h" #ifdef DEV_PFLOG #define NPFLOG DEV_PFLOG #else #define NPFLOG 0 #endif #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 #include #include #include #if NPFLOG > 0 #include #endif /* NPFLOG > 0 */ #ifdef INET6 #include #include #endif /* INET6 */ #ifdef ALTQ #include #endif #include #include #include #include static void cleanup_pf_zone(void); int pfattach(void); static struct pf_pool *pf_get_pool(char *, u_int32_t, u_int8_t, u_int32_t, u_int8_t, u_int8_t, u_int8_t); static void pf_mv_pool(struct pf_palist *, struct pf_palist *); static void pf_empty_pool(struct pf_palist *); static int pfioctl(struct cdev *, u_long, caddr_t, int, struct thread *); #ifdef ALTQ static int pf_begin_altq(u_int32_t *); static int pf_rollback_altq(u_int32_t); static int pf_commit_altq(u_int32_t); static int pf_enable_altq(struct pf_altq *); static int pf_disable_altq(struct pf_altq *); static u_int32_t pf_qname2qid(char *); static void pf_qid_unref(u_int32_t); #endif /* ALTQ */ static int pf_begin_rules(u_int32_t *, int, const char *); static int pf_rollback_rules(u_int32_t, int, char *); static int pf_setup_pfsync_matching(struct pf_ruleset *); static void pf_hash_rule(MD5_CTX *, struct pf_rule *); static void pf_hash_rule_addr(MD5_CTX *, struct pf_rule_addr *); static int pf_commit_rules(u_int32_t, int, char *); static int pf_addr_setup(struct pf_ruleset *, struct pf_addr_wrap *, sa_family_t); static void pf_addr_copyout(struct pf_addr_wrap *); static void pf_pkt_addr_changed(struct mbuf *); #define TAGID_MAX 50000 VNET_DEFINE(struct pf_rule, pf_default_rule); VNET_DEFINE(struct sx, pf_consistency_lock); #ifdef ALTQ static VNET_DEFINE(int, pf_altq_running); #define V_pf_altq_running VNET(pf_altq_running) #endif TAILQ_HEAD(pf_tags, pf_tagname); #define V_pf_tags VNET(pf_tags) VNET_DEFINE(struct pf_tags, pf_tags); #define V_pf_qids VNET(pf_qids) VNET_DEFINE(struct pf_tags, pf_qids); #if (PF_QNAME_SIZE != PF_TAG_NAME_SIZE) #error PF_QNAME_SIZE must be equal to PF_TAG_NAME_SIZE #endif static u_int16_t tagname2tag(struct pf_tags *, char *); static u_int16_t pf_tagname2tag(char *); void tag_unref(struct pf_tags *, u_int16_t); static int pf_rtlabel_add(struct pf_addr_wrap *); static void pf_rtlabel_remove(struct pf_addr_wrap *); static void pf_rtlabel_copyout(struct pf_addr_wrap *); #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x struct cdev *pf_dev; /* * XXX - These are new and need to be checked when moveing to a new version */ static void pf_clear_states(void); static int pf_clear_tables(void); static void pf_clear_srcnodes(void); /* * Wrapper functions for pfil(9) hooks */ #ifdef INET static int pf_check_in(void *arg, struct mbuf **m, struct ifnet *ifp, int dir, struct inpcb *inp); static int pf_check_out(void *arg, struct mbuf **m, struct ifnet *ifp, int dir, struct inpcb *inp); #endif #ifdef INET6 static int pf_check6_in(void *arg, struct mbuf **m, struct ifnet *ifp, int dir, struct inpcb *inp); static int pf_check6_out(void *arg, struct mbuf **m, struct ifnet *ifp, int dir, struct inpcb *inp); #endif static int hook_pf(void); static int dehook_pf(void); static int shutdown_pf(void); static int pf_load(void); static int pf_unload(void); static struct cdevsw pf_cdevsw = { .d_ioctl = pfioctl, .d_name = PF_NAME, .d_version = D_VERSION, }; static volatile VNET_DEFINE(int, pf_pfil_hooked); #define V_pf_pfil_hooked VNET(pf_pfil_hooked) VNET_DEFINE(int, pf_end_threads); struct mtx pf_mtx; struct mtx pf_state_keys_mtx; struct mtx pf_state_ids_mtx; struct rwlock pf_state_list_lock; struct rwlock pf_rules_lock; /* pfsync */ pfsync_state_import_t *pfsync_state_import_ptr = NULL; pfsync_insert_state_t *pfsync_insert_state_ptr = NULL; pfsync_update_state_t *pfsync_update_state_ptr = NULL; pfsync_delete_state_t *pfsync_delete_state_ptr = NULL; pfsync_clear_states_t *pfsync_clear_states_ptr = NULL; pfsync_state_in_use_t *pfsync_state_in_use_ptr = NULL; pfsync_defer_t *pfsync_defer_ptr = NULL; pfsync_up_t *pfsync_up_ptr = NULL; /* pflow */ export_pflow_t *export_pflow_ptr = NULL; /* pflog */ pflog_packet_t *pflog_packet_ptr = NULL; VNET_DEFINE(int, debug_pfugidhack); SYSCTL_VNET_INT(_debug, OID_AUTO, pfugidhack, CTLFLAG_RW, &VNET_NAME(debug_pfugidhack), 0, "Enable/disable pf user/group rules mpsafe hack"); static void init_pf_mutex(void) { mtx_init(&pf_mtx, "pf Giant", NULL, MTX_DEF); mtx_init(&pf_state_keys_mtx, "pf state keys", NULL, MTX_DEF); mtx_init(&pf_state_ids_mtx, "pf state ids", NULL, MTX_DEF); rw_init(&pf_state_list_lock, "pf state list"); rw_init(&pf_rules_lock, "pf rulesets"); /* XXXGL: name */ sx_init(&V_pf_consistency_lock, "pf_statetbl_lock"); } static void destroy_pf_mutex(void) { mtx_destroy(&pf_mtx); mtx_destroy(&pf_state_keys_mtx); mtx_destroy(&pf_state_ids_mtx); rw_destroy(&pf_state_list_lock); rw_destroy(&pf_rules_lock); sx_destroy(&V_pf_consistency_lock); } static void cleanup_pf_zone(void) { uma_zdestroy(V_pf_src_tree_z); uma_zdestroy(V_pf_rule_z); uma_zdestroy(V_pf_state_z); uma_zdestroy(V_pf_state_key_z); uma_zdestroy(V_pf_altq_z); uma_zdestroy(V_pf_pooladdr_z); uma_zdestroy(V_pfr_ktable_z); uma_zdestroy(V_pfr_kentry_z); uma_zdestroy(V_pfi_addr_z); } static int pf_state_key_ini(void *mem, int size, int flags) { struct pf_state_key *sk = mem; + bzero(sk, sizeof(*sk)); TAILQ_INIT(&sk->states); return (0); } int pfattach(void) { u_int32_t *my_timeout = V_pf_default_rule.timeout; V_pf_src_tree_z = uma_zcreate("pf src nodes", sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); V_pf_rule_z = uma_zcreate("pf rules", sizeof(struct pf_rule), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); V_pf_state_key_z = uma_zcreate("pf state keys", sizeof(struct pf_state_key), NULL, NULL, pf_state_key_ini, NULL, UMA_ALIGN_PTR, 0); V_pf_altq_z = uma_zcreate("pf altq", sizeof(struct pf_altq), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); V_pf_pooladdr_z = uma_zcreate("pf pool addresses", sizeof(struct pf_pooladdr), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); V_pfr_ktable_z = uma_zcreate("pf tables", sizeof(struct pfr_ktable), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); V_pfr_kentry_z = uma_zcreate("pf table entries", sizeof(struct pfr_kentry), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); V_pfi_addr_z = uma_zcreate("pf pfi_dynaddr", sizeof(struct pfi_dynaddr), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); pfr_initialize(); pfi_initialize(); pf_osfp_initialize(); pf_normalize_init(); V_pf_pool_limits[PF_LIMIT_STATES].pp = V_pf_state_z; V_pf_pool_limits[PF_LIMIT_STATES].limit = PFSTATE_HIWAT; V_pf_pool_limits[PF_LIMIT_SRC_NODES].pp = V_pf_src_tree_z; V_pf_pool_limits[PF_LIMIT_SRC_NODES].limit = PFSNODE_HIWAT; V_pf_pool_limits[PF_LIMIT_TABLES].pp = V_pfr_ktable_z; V_pf_pool_limits[PF_LIMIT_TABLES].limit = PFR_KTABLE_HIWAT; V_pf_pool_limits[PF_LIMIT_TABLE_ENTRIES].pp = V_pfr_kentry_z; V_pf_pool_limits[PF_LIMIT_TABLE_ENTRIES].limit = PFR_KENTRY_HIWAT; uma_zone_set_max(V_pf_pool_limits[PF_LIMIT_STATES].pp, V_pf_pool_limits[PF_LIMIT_STATES].limit); RB_INIT(&V_tree_src_tracking); RB_INIT(&V_pf_anchors); pf_init_ruleset(&pf_main_ruleset); TAILQ_INIT(&V_pf_altqs[0]); TAILQ_INIT(&V_pf_altqs[1]); TAILQ_INIT(&V_pf_pabuf); V_pf_altqs_active = &V_pf_altqs[0]; V_pf_altqs_inactive = &V_pf_altqs[1]; TAILQ_INIT(&V_state_list); /* default rule should never be garbage collected */ V_pf_default_rule.entries.tqe_prev = &V_pf_default_rule.entries.tqe_next; V_pf_default_rule.action = PF_PASS; V_pf_default_rule.nr = -1; V_pf_default_rule.rtableid = -1; /* initialize default timeouts */ my_timeout[PFTM_TCP_FIRST_PACKET] = PFTM_TCP_FIRST_PACKET_VAL; my_timeout[PFTM_TCP_OPENING] = PFTM_TCP_OPENING_VAL; my_timeout[PFTM_TCP_ESTABLISHED] = PFTM_TCP_ESTABLISHED_VAL; my_timeout[PFTM_TCP_CLOSING] = PFTM_TCP_CLOSING_VAL; my_timeout[PFTM_TCP_FIN_WAIT] = PFTM_TCP_FIN_WAIT_VAL; my_timeout[PFTM_TCP_CLOSED] = PFTM_TCP_CLOSED_VAL; my_timeout[PFTM_UDP_FIRST_PACKET] = PFTM_UDP_FIRST_PACKET_VAL; my_timeout[PFTM_UDP_SINGLE] = PFTM_UDP_SINGLE_VAL; my_timeout[PFTM_UDP_MULTIPLE] = PFTM_UDP_MULTIPLE_VAL; my_timeout[PFTM_ICMP_FIRST_PACKET] = PFTM_ICMP_FIRST_PACKET_VAL; my_timeout[PFTM_ICMP_ERROR_REPLY] = PFTM_ICMP_ERROR_REPLY_VAL; my_timeout[PFTM_OTHER_FIRST_PACKET] = PFTM_OTHER_FIRST_PACKET_VAL; my_timeout[PFTM_OTHER_SINGLE] = PFTM_OTHER_SINGLE_VAL; my_timeout[PFTM_OTHER_MULTIPLE] = PFTM_OTHER_MULTIPLE_VAL; my_timeout[PFTM_FRAG] = PFTM_FRAG_VAL; my_timeout[PFTM_INTERVAL] = PFTM_INTERVAL_VAL; my_timeout[PFTM_SRC_NODE] = PFTM_SRC_NODE_VAL; my_timeout[PFTM_TS_DIFF] = PFTM_TS_DIFF_VAL; my_timeout[PFTM_ADAPTIVE_START] = PFSTATE_ADAPT_START; my_timeout[PFTM_ADAPTIVE_END] = PFSTATE_ADAPT_END; bzero(&V_pf_status, sizeof(V_pf_status)); V_pf_status.debug = PF_DEBUG_URGENT; V_pf_pfil_hooked = 0; /* XXX do our best to avoid a conflict */ V_pf_status.hostid = arc4random(); if (kproc_create(pf_purge_thread, curvnet, NULL, 0, 0, "pfpurge")) /* XXXGL: leaked all above. */ return (ENXIO); m_addr_chg_pf_p = pf_pkt_addr_changed; return (0); } static struct pf_pool * pf_get_pool(char *anchor, u_int32_t ticket, u_int8_t rule_action, u_int32_t rule_number, u_int8_t r_last, u_int8_t active, u_int8_t check_ticket) { struct pf_ruleset *ruleset; struct pf_rule *rule; int rs_num; ruleset = pf_find_ruleset(anchor); if (ruleset == NULL) return (NULL); rs_num = pf_get_ruleset_number(rule_action); if (rs_num >= PF_RULESET_MAX) return (NULL); if (active) { if (check_ticket && ticket != ruleset->rules[rs_num].active.ticket) return (NULL); if (r_last) rule = TAILQ_LAST(ruleset->rules[rs_num].active.ptr, pf_rulequeue); else rule = TAILQ_FIRST(ruleset->rules[rs_num].active.ptr); } else { if (check_ticket && ticket != ruleset->rules[rs_num].inactive.ticket) return (NULL); if (r_last) rule = TAILQ_LAST(ruleset->rules[rs_num].inactive.ptr, pf_rulequeue); else rule = TAILQ_FIRST(ruleset->rules[rs_num].inactive.ptr); } if (!r_last) { while ((rule != NULL) && (rule->nr != rule_number)) rule = TAILQ_NEXT(rule, entries); } if (rule == NULL) return (NULL); return (&rule->rpool); } static void pf_mv_pool(struct pf_palist *poola, struct pf_palist *poolb) { struct pf_pooladdr *mv_pool_pa; while ((mv_pool_pa = TAILQ_FIRST(poola)) != NULL) { TAILQ_REMOVE(poola, mv_pool_pa, entries); TAILQ_INSERT_TAIL(poolb, mv_pool_pa, entries); } } static void pf_empty_pool(struct pf_palist *poola) { struct pf_pooladdr *empty_pool_pa; while ((empty_pool_pa = TAILQ_FIRST(poola)) != NULL) { pfi_dynaddr_remove(&empty_pool_pa->addr); pf_tbladdr_remove(&empty_pool_pa->addr); pfi_kif_unref(empty_pool_pa->kif, PFI_KIF_REF_RULE); TAILQ_REMOVE(poola, empty_pool_pa, entries); uma_zfree(V_pf_pooladdr_z, empty_pool_pa); } } void pf_rm_rule(struct pf_rulequeue *rulequeue, struct pf_rule *rule) { if (rulequeue != NULL) { if (rule->states_cur <= 0) { /* * XXX - we need to remove the table *before* detaching * the rule to make sure the table code does not delete * the anchor under our feet. */ pf_tbladdr_remove(&rule->src.addr); pf_tbladdr_remove(&rule->dst.addr); if (rule->overload_tbl) pfr_detach_table(rule->overload_tbl); } TAILQ_REMOVE(rulequeue, rule, entries); rule->entries.tqe_prev = NULL; rule->nr = -1; } if (rule->states_cur > 0 || rule->src_nodes > 0 || rule->entries.tqe_prev != NULL) return; pf_tag_unref(rule->tag); pf_tag_unref(rule->match_tag); #ifdef ALTQ if (rule->pqid != rule->qid) pf_qid_unref(rule->pqid); pf_qid_unref(rule->qid); #endif pf_rtlabel_remove(&rule->src.addr); pf_rtlabel_remove(&rule->dst.addr); pfi_dynaddr_remove(&rule->src.addr); pfi_dynaddr_remove(&rule->dst.addr); if (rulequeue == NULL) { pf_tbladdr_remove(&rule->src.addr); pf_tbladdr_remove(&rule->dst.addr); if (rule->overload_tbl) pfr_detach_table(rule->overload_tbl); } pfi_kif_unref(rule->kif, PFI_KIF_REF_RULE); pf_anchor_remove(rule); pf_empty_pool(&rule->rpool.list); uma_zfree(V_pf_rule_z, rule); } static u_int16_t tagname2tag(struct pf_tags *head, char *tagname) { struct pf_tagname *tag, *p = NULL; u_int16_t new_tagid = 1; TAILQ_FOREACH(tag, head, entries) if (strcmp(tagname, tag->name) == 0) { tag->ref++; return (tag->tag); } /* * to avoid fragmentation, we do a linear search from the beginning * and take the first free slot we find. if there is none or the list * is empty, append a new entry at the end. */ /* new entry */ if (!TAILQ_EMPTY(head)) for (p = TAILQ_FIRST(head); p != NULL && p->tag == new_tagid; p = TAILQ_NEXT(p, entries)) new_tagid = p->tag + 1; if (new_tagid > TAGID_MAX) return (0); /* allocate and fill new struct pf_tagname */ tag = malloc(sizeof(*tag), M_TEMP, M_NOWAIT|M_ZERO); if (tag == NULL) return (0); strlcpy(tag->name, tagname, sizeof(tag->name)); tag->tag = new_tagid; tag->ref++; if (p != NULL) /* insert new entry before p */ TAILQ_INSERT_BEFORE(p, tag, entries); else /* either list empty or no free slot in between */ TAILQ_INSERT_TAIL(head, tag, entries); return (tag->tag); } void tag_unref(struct pf_tags *head, u_int16_t tag) { struct pf_tagname *p, *next; if (tag == 0) return; for (p = TAILQ_FIRST(head); p != NULL; p = next) { next = TAILQ_NEXT(p, entries); if (tag == p->tag) { if (--p->ref == 0) { TAILQ_REMOVE(head, p, entries); free(p, M_TEMP); } break; } } } static u_int16_t pf_tagname2tag(char *tagname) { return (tagname2tag(&V_pf_tags, tagname)); } void pf_tag_ref(u_int16_t tag) { struct pf_tagname *t; TAILQ_FOREACH(t, &V_pf_tags, entries) if (t->tag == tag) break; if (t != NULL) t->ref++; } void pf_tag_unref(u_int16_t tag) { tag_unref(&V_pf_tags, tag); } static int pf_rtlabel_add(struct pf_addr_wrap *a) { /* XXX_IMPORT: later */ return (0); } static void pf_rtlabel_remove(struct pf_addr_wrap *a) { /* XXX_IMPORT: later */ } static void pf_rtlabel_copyout(struct pf_addr_wrap *a) { /* XXX_IMPORT: later */ if (a->type == PF_ADDR_RTLABEL && a->v.rtlabel) strlcpy(a->v.rtlabelname, "?", sizeof(a->v.rtlabelname)); } #ifdef ALTQ static u_int32_t pf_qname2qid(char *qname) { return ((u_int32_t)tagname2tag(&V_pf_qids, qname)); } static void pf_qid_unref(u_int32_t qid) { tag_unref(&V_pf_qids, (u_int16_t)qid); } static int pf_begin_altq(u_int32_t *ticket) { struct pf_altq *altq; int error = 0; /* Purge the old altq list */ while ((altq = TAILQ_FIRST(V_pf_altqs_inactive)) != NULL) { TAILQ_REMOVE(V_pf_altqs_inactive, altq, entries); if (altq->qname[0] == 0 && (altq->local_flags & PFALTQ_FLAG_IF_REMOVED) == 0) { /* detach and destroy the discipline */ error = altq_remove(altq); } else pf_qid_unref(altq->qid); uma_zfree(V_pf_altq_z, altq); } if (error) return (error); *ticket = ++V_ticket_altqs_inactive; V_altqs_inactive_open = 1; return (0); } static int pf_rollback_altq(u_int32_t ticket) { struct pf_altq *altq; int error = 0; if (!V_altqs_inactive_open || ticket != V_ticket_altqs_inactive) return (0); /* Purge the old altq list */ while ((altq = TAILQ_FIRST(V_pf_altqs_inactive)) != NULL) { TAILQ_REMOVE(V_pf_altqs_inactive, altq, entries); if (altq->qname[0] == 0 && (altq->local_flags & PFALTQ_FLAG_IF_REMOVED) == 0) { /* detach and destroy the discipline */ error = altq_remove(altq); } else pf_qid_unref(altq->qid); uma_zfree(V_pf_altq_z, altq); } V_altqs_inactive_open = 0; return (error); } static int pf_commit_altq(u_int32_t ticket) { struct pf_altqqueue *old_altqs; struct pf_altq *altq; int err, error = 0; if (!V_altqs_inactive_open || ticket != V_ticket_altqs_inactive) return (EBUSY); /* swap altqs, keep the old. */ old_altqs = V_pf_altqs_active; V_pf_altqs_active = V_pf_altqs_inactive; V_pf_altqs_inactive = old_altqs; V_ticket_altqs_active = V_ticket_altqs_inactive; /* Attach new disciplines */ TAILQ_FOREACH(altq, V_pf_altqs_active, entries) { if (altq->qname[0] == 0 && (altq->local_flags & PFALTQ_FLAG_IF_REMOVED) == 0) { /* attach the discipline */ error = altq_pfattach(altq); if (error == 0 && V_pf_altq_running) error = pf_enable_altq(altq); if (error != 0) return (error); } } /* Purge the old altq list */ while ((altq = TAILQ_FIRST(V_pf_altqs_inactive)) != NULL) { TAILQ_REMOVE(V_pf_altqs_inactive, altq, entries); if (altq->qname[0] == 0 && (altq->local_flags & PFALTQ_FLAG_IF_REMOVED) == 0) { /* detach and destroy the discipline */ if (V_pf_altq_running) error = pf_disable_altq(altq); err = altq_pfdetach(altq); if (err != 0 && error == 0) error = err; err = altq_remove(altq); if (err != 0 && error == 0) error = err; } else pf_qid_unref(altq->qid); uma_zfree(V_pf_altq_z, altq); } V_altqs_inactive_open = 0; return (error); } static int pf_enable_altq(struct pf_altq *altq) { struct ifnet *ifp; struct tb_profile tb; int error = 0; if ((ifp = ifunit(altq->ifname)) == NULL) return (EINVAL); if (ifp->if_snd.altq_type != ALTQT_NONE) error = altq_enable(&ifp->if_snd); /* set tokenbucket regulator */ if (error == 0 && ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) { tb.rate = altq->ifbandwidth; tb.depth = altq->tbrsize; PF_UNLOCK(); error = tbr_set(&ifp->if_snd, &tb); PF_LOCK(); } return (error); } static int pf_disable_altq(struct pf_altq *altq) { struct ifnet *ifp; struct tb_profile tb; int error; if ((ifp = ifunit(altq->ifname)) == NULL) return (EINVAL); /* * when the discipline is no longer referenced, it was overridden * by a new one. if so, just return. */ if (altq->altq_disc != ifp->if_snd.altq_disc) return (0); error = altq_disable(&ifp->if_snd); if (error == 0) { /* clear tokenbucket regulator */ tb.rate = 0; PF_UNLOCK(); error = tbr_set(&ifp->if_snd, &tb); PF_LOCK(); } return (error); } void pf_altq_ifnet_event(struct ifnet *ifp, int remove) { struct ifnet *ifp1; struct pf_altq *a1, *a2, *a3; u_int32_t ticket; int error = 0; /* Interrupt userland queue modifications */ if (V_altqs_inactive_open) pf_rollback_altq(V_ticket_altqs_inactive); /* Start new altq ruleset */ if (pf_begin_altq(&ticket)) return; /* Copy the current active set */ TAILQ_FOREACH(a1, V_pf_altqs_active, entries) { a2 = uma_zalloc(V_pf_altq_z, M_NOWAIT); if (a2 == NULL) { error = ENOMEM; break; } bcopy(a1, a2, sizeof(struct pf_altq)); if (a2->qname[0] != 0) { if ((a2->qid = pf_qname2qid(a2->qname)) == 0) { error = EBUSY; uma_zfree(V_pf_altq_z, a2); break; } a2->altq_disc = NULL; TAILQ_FOREACH(a3, V_pf_altqs_inactive, entries) { if (strncmp(a3->ifname, a2->ifname, IFNAMSIZ) == 0 && a3->qname[0] == 0) { a2->altq_disc = a3->altq_disc; break; } } } /* Deactivate the interface in question */ a2->local_flags &= ~PFALTQ_FLAG_IF_REMOVED; if ((ifp1 = ifunit(a2->ifname)) == NULL || (remove && ifp1 == ifp)) { a2->local_flags |= PFALTQ_FLAG_IF_REMOVED; } else { PF_UNLOCK(); error = altq_add(a2); PF_LOCK(); if (ticket != V_ticket_altqs_inactive) error = EBUSY; if (error) { uma_zfree(V_pf_altq_z, a2); break; } } TAILQ_INSERT_TAIL(V_pf_altqs_inactive, a2, entries); } if (error != 0) pf_rollback_altq(ticket); else pf_commit_altq(ticket); } #endif /* ALTQ */ static int pf_begin_rules(u_int32_t *ticket, int rs_num, const char *anchor) { struct pf_ruleset *rs; struct pf_rule *rule; if (rs_num < 0 || rs_num >= PF_RULESET_MAX) return (EINVAL); rs = pf_find_or_create_ruleset(anchor); if (rs == NULL) return (EINVAL); while ((rule = TAILQ_FIRST(rs->rules[rs_num].inactive.ptr)) != NULL) { pf_rm_rule(rs->rules[rs_num].inactive.ptr, rule); rs->rules[rs_num].inactive.rcount--; } *ticket = ++rs->rules[rs_num].inactive.ticket; rs->rules[rs_num].inactive.open = 1; return (0); } static int pf_rollback_rules(u_int32_t ticket, int rs_num, char *anchor) { struct pf_ruleset *rs; struct pf_rule *rule; if (rs_num < 0 || rs_num >= PF_RULESET_MAX) return (EINVAL); rs = pf_find_ruleset(anchor); if (rs == NULL || !rs->rules[rs_num].inactive.open || rs->rules[rs_num].inactive.ticket != ticket) return (0); while ((rule = TAILQ_FIRST(rs->rules[rs_num].inactive.ptr)) != NULL) { pf_rm_rule(rs->rules[rs_num].inactive.ptr, rule); rs->rules[rs_num].inactive.rcount--; } rs->rules[rs_num].inactive.open = 0; return (0); } #define PF_MD5_UPD(st, elm) \ MD5Update(ctx, (u_int8_t *) &(st)->elm, sizeof((st)->elm)) #define PF_MD5_UPD_STR(st, elm) \ MD5Update(ctx, (u_int8_t *) (st)->elm, strlen((st)->elm)) #define PF_MD5_UPD_HTONL(st, elm, stor) do { \ (stor) = htonl((st)->elm); \ MD5Update(ctx, (u_int8_t *) &(stor), sizeof(u_int32_t));\ } while (0) #define PF_MD5_UPD_HTONS(st, elm, stor) do { \ (stor) = htons((st)->elm); \ MD5Update(ctx, (u_int8_t *) &(stor), sizeof(u_int16_t));\ } while (0) static void pf_hash_rule_addr(MD5_CTX *ctx, struct pf_rule_addr *pfr) { PF_MD5_UPD(pfr, addr.type); switch (pfr->addr.type) { case PF_ADDR_DYNIFTL: PF_MD5_UPD(pfr, addr.v.ifname); PF_MD5_UPD(pfr, addr.iflags); break; case PF_ADDR_TABLE: PF_MD5_UPD(pfr, addr.v.tblname); break; case PF_ADDR_ADDRMASK: /* XXX ignore af? */ PF_MD5_UPD(pfr, addr.v.a.addr.addr32); PF_MD5_UPD(pfr, addr.v.a.mask.addr32); break; case PF_ADDR_RTLABEL: PF_MD5_UPD(pfr, addr.v.rtlabelname); break; } PF_MD5_UPD(pfr, port[0]); PF_MD5_UPD(pfr, port[1]); PF_MD5_UPD(pfr, neg); PF_MD5_UPD(pfr, port_op); } static void pf_hash_rule(MD5_CTX *ctx, struct pf_rule *rule) { u_int16_t x; u_int32_t y; pf_hash_rule_addr(ctx, &rule->src); pf_hash_rule_addr(ctx, &rule->dst); PF_MD5_UPD_STR(rule, label); PF_MD5_UPD_STR(rule, ifname); PF_MD5_UPD_STR(rule, match_tagname); PF_MD5_UPD_HTONS(rule, match_tag, x); /* dup? */ PF_MD5_UPD_HTONL(rule, os_fingerprint, y); PF_MD5_UPD_HTONL(rule, prob, y); PF_MD5_UPD_HTONL(rule, uid.uid[0], y); PF_MD5_UPD_HTONL(rule, uid.uid[1], y); PF_MD5_UPD(rule, uid.op); PF_MD5_UPD_HTONL(rule, gid.gid[0], y); PF_MD5_UPD_HTONL(rule, gid.gid[1], y); PF_MD5_UPD(rule, gid.op); PF_MD5_UPD_HTONL(rule, rule_flag, y); PF_MD5_UPD(rule, action); PF_MD5_UPD(rule, direction); PF_MD5_UPD(rule, af); PF_MD5_UPD(rule, quick); PF_MD5_UPD(rule, ifnot); PF_MD5_UPD(rule, match_tag_not); PF_MD5_UPD(rule, natpass); PF_MD5_UPD(rule, keep_state); PF_MD5_UPD(rule, proto); PF_MD5_UPD(rule, type); PF_MD5_UPD(rule, code); PF_MD5_UPD(rule, flags); PF_MD5_UPD(rule, flagset); PF_MD5_UPD(rule, allow_opts); PF_MD5_UPD(rule, rt); PF_MD5_UPD(rule, tos); } static int pf_commit_rules(u_int32_t ticket, int rs_num, char *anchor) { struct pf_ruleset *rs; struct pf_rule *rule, **old_array; struct pf_rulequeue *old_rules; int error; u_int32_t old_rcount; if (rs_num < 0 || rs_num >= PF_RULESET_MAX) return (EINVAL); rs = pf_find_ruleset(anchor); if (rs == NULL || !rs->rules[rs_num].inactive.open || ticket != rs->rules[rs_num].inactive.ticket) return (EBUSY); /* Calculate checksum for the main ruleset */ if (rs == &pf_main_ruleset) { error = pf_setup_pfsync_matching(rs); if (error != 0) return (error); } /* Swap rules, keep the old. */ old_rules = rs->rules[rs_num].active.ptr; old_rcount = rs->rules[rs_num].active.rcount; old_array = rs->rules[rs_num].active.ptr_array; rs->rules[rs_num].active.ptr = rs->rules[rs_num].inactive.ptr; rs->rules[rs_num].active.ptr_array = rs->rules[rs_num].inactive.ptr_array; rs->rules[rs_num].active.rcount = rs->rules[rs_num].inactive.rcount; rs->rules[rs_num].inactive.ptr = old_rules; rs->rules[rs_num].inactive.ptr_array = old_array; rs->rules[rs_num].inactive.rcount = old_rcount; rs->rules[rs_num].active.ticket = rs->rules[rs_num].inactive.ticket; pf_calc_skip_steps(rs->rules[rs_num].active.ptr); /* Purge the old rule list. */ while ((rule = TAILQ_FIRST(old_rules)) != NULL) pf_rm_rule(old_rules, rule); if (rs->rules[rs_num].inactive.ptr_array) free(rs->rules[rs_num].inactive.ptr_array, M_TEMP); rs->rules[rs_num].inactive.ptr_array = NULL; rs->rules[rs_num].inactive.rcount = 0; rs->rules[rs_num].inactive.open = 0; pf_remove_if_empty_ruleset(rs); return (0); } static int pf_setup_pfsync_matching(struct pf_ruleset *rs) { MD5_CTX ctx; struct pf_rule *rule; int rs_cnt; u_int8_t digest[PF_MD5_DIGEST_LENGTH]; MD5Init(&ctx); for (rs_cnt = 0; rs_cnt < PF_RULESET_MAX; rs_cnt++) { /* XXX PF_RULESET_SCRUB as well? */ if (rs_cnt == PF_RULESET_SCRUB) continue; if (rs->rules[rs_cnt].inactive.ptr_array) free(rs->rules[rs_cnt].inactive.ptr_array, M_TEMP); rs->rules[rs_cnt].inactive.ptr_array = NULL; if (rs->rules[rs_cnt].inactive.rcount) { rs->rules[rs_cnt].inactive.ptr_array = malloc(sizeof(caddr_t) * rs->rules[rs_cnt].inactive.rcount, M_TEMP, M_NOWAIT); if (!rs->rules[rs_cnt].inactive.ptr_array) return (ENOMEM); } TAILQ_FOREACH(rule, rs->rules[rs_cnt].inactive.ptr, entries) { pf_hash_rule(&ctx, rule); (rs->rules[rs_cnt].inactive.ptr_array)[rule->nr] = rule; } } MD5Final(digest, &ctx); memcpy(V_pf_status.pf_chksum, digest, sizeof(V_pf_status.pf_chksum)); return (0); } static int pf_addr_setup(struct pf_ruleset *ruleset, struct pf_addr_wrap *addr, sa_family_t af) { if (pfi_dynaddr_setup(addr, af) || pf_tbladdr_setup(ruleset, addr)) return (EINVAL); return (0); } static void pf_addr_copyout(struct pf_addr_wrap *addr) { pfi_dynaddr_copyout(addr); pf_tbladdr_copyout(addr); pf_rtlabel_copyout(addr); } static int pfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) { struct pf_pooladdr *pa = NULL; struct pf_pool *pool = NULL; int error = 0; CURVNET_SET(TD_TO_VNET(td)); /* XXX keep in sync with switch() below */ if (securelevel_gt(td->td_ucred, 2)) switch (cmd) { case DIOCGETRULES: case DIOCGETRULE: case DIOCGETADDRS: case DIOCGETADDR: case DIOCGETSTATE: case DIOCSETSTATUSIF: case DIOCGETSTATUS: case DIOCCLRSTATUS: case DIOCNATLOOK: case DIOCSETDEBUG: case DIOCGETSTATES: case DIOCGETTIMEOUT: case DIOCCLRRULECTRS: case DIOCGETLIMIT: case DIOCGETALTQS: case DIOCGETALTQ: case DIOCGETQSTATS: case DIOCGETRULESETS: case DIOCGETRULESET: case DIOCRGETTABLES: case DIOCRGETTSTATS: case DIOCRCLRTSTATS: case DIOCRCLRADDRS: case DIOCRADDADDRS: case DIOCRDELADDRS: case DIOCRSETADDRS: case DIOCRGETADDRS: case DIOCRGETASTATS: case DIOCRCLRASTATS: case DIOCRTSTADDRS: case DIOCOSFPGET: case DIOCGETSRCNODES: case DIOCCLRSRCNODES: case DIOCIGETIFACES: case DIOCGIFSPEED: case DIOCSETIFFLAG: case DIOCCLRIFFLAG: break; case DIOCRCLRTABLES: case DIOCRADDTABLES: case DIOCRDELTABLES: case DIOCRSETTFLAGS: if (((struct pfioc_table *)addr)->pfrio_flags & PFR_FLAG_DUMMY) break; /* dummy operation ok */ return (EPERM); default: return (EPERM); } if (!(flags & FWRITE)) switch (cmd) { case DIOCGETRULES: case DIOCGETADDRS: case DIOCGETADDR: case DIOCGETSTATE: case DIOCGETSTATUS: case DIOCGETSTATES: case DIOCGETTIMEOUT: case DIOCGETLIMIT: case DIOCGETALTQS: case DIOCGETALTQ: case DIOCGETQSTATS: case DIOCGETRULESETS: case DIOCGETRULESET: case DIOCNATLOOK: case DIOCRGETTABLES: case DIOCRGETTSTATS: case DIOCRGETADDRS: case DIOCRGETASTATS: case DIOCRTSTADDRS: case DIOCOSFPGET: case DIOCGETSRCNODES: case DIOCIGETIFACES: case DIOCGIFSPEED: break; case DIOCRCLRTABLES: case DIOCRADDTABLES: case DIOCRDELTABLES: case DIOCRCLRTSTATS: case DIOCRCLRADDRS: case DIOCRADDADDRS: case DIOCRDELADDRS: case DIOCRSETADDRS: case DIOCRSETTFLAGS: if (((struct pfioc_table *)addr)->pfrio_flags & PFR_FLAG_DUMMY) { flags |= FWRITE; /* need write lock for dummy */ break; /* dummy operation ok */ } return (EACCES); case DIOCGETRULE: if (((struct pfioc_rule *)addr)->action == PF_GET_CLR_CNTR) return (EACCES); break; default: return (EACCES); } if (flags & FWRITE) sx_xlock(&V_pf_consistency_lock); else sx_slock(&V_pf_consistency_lock); PF_LOCK(); switch (cmd) { case DIOCSTART: if (V_pf_status.running) error = EEXIST; else { PF_UNLOCK(); error = hook_pf(); PF_LOCK(); if (error) { DPFPRINTF(PF_DEBUG_MISC, ("pf: pfil registeration fail\n")); break; } V_pf_status.running = 1; V_pf_status.since = time_second; if (V_pf_status.stateid == 0) { V_pf_status.stateid = time_second; V_pf_status.stateid = V_pf_status.stateid << 32; } DPFPRINTF(PF_DEBUG_MISC, ("pf: started\n")); } break; case DIOCSTOP: if (!V_pf_status.running) error = ENOENT; else { V_pf_status.running = 0; PF_UNLOCK(); error = dehook_pf(); PF_LOCK(); if (error) { V_pf_status.running = 1; DPFPRINTF(PF_DEBUG_MISC, ("pf: pfil unregisteration failed\n")); } V_pf_status.since = time_second; DPFPRINTF(PF_DEBUG_MISC, ("pf: stopped\n")); } break; case DIOCADDRULE: { struct pfioc_rule *pr = (struct pfioc_rule *)addr; struct pf_ruleset *ruleset; struct pf_rule *rule, *tail; struct pf_pooladdr *pa; int rs_num; pr->anchor[sizeof(pr->anchor) - 1] = 0; ruleset = pf_find_ruleset(pr->anchor); if (ruleset == NULL) { error = EINVAL; break; } rs_num = pf_get_ruleset_number(pr->rule.action); if (rs_num >= PF_RULESET_MAX) { error = EINVAL; break; } if (pr->rule.return_icmp >> 8 > ICMP_MAXTYPE) { error = EINVAL; break; } if (pr->ticket != ruleset->rules[rs_num].inactive.ticket) { DPFPRINTF(PF_DEBUG_MISC, ("ticket: %d != [%d]%d\n", pr->ticket, rs_num, ruleset->rules[rs_num].inactive.ticket)); error = EBUSY; break; } if (pr->pool_ticket != V_ticket_pabuf) { DPFPRINTF(PF_DEBUG_MISC, ("pool_ticket: %d != %d\n", pr->pool_ticket, V_ticket_pabuf)); error = EBUSY; break; } rule = uma_zalloc(V_pf_rule_z, M_NOWAIT); if (rule == NULL) { error = ENOMEM; break; } bcopy(&pr->rule, rule, sizeof(struct pf_rule)); rule->cuid = td->td_ucred->cr_ruid; rule->cpid = td->td_proc ? td->td_proc->p_pid : 0; rule->anchor = NULL; rule->kif = NULL; TAILQ_INIT(&rule->rpool.list); /* initialize refcounting */ rule->states_cur = 0; rule->src_nodes = 0; rule->entries.tqe_prev = NULL; #ifndef INET if (rule->af == AF_INET) { uma_zfree(V_pf_rule_z, rule); error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (rule->af == AF_INET6) { uma_zfree(V_pf_rule_z, rule); error = EAFNOSUPPORT; break; } #endif /* INET6 */ tail = TAILQ_LAST(ruleset->rules[rs_num].inactive.ptr, pf_rulequeue); if (tail) rule->nr = tail->nr + 1; else rule->nr = 0; if (rule->ifname[0]) { rule->kif = pfi_kif_get(rule->ifname); if (rule->kif == NULL) { uma_zfree(V_pf_rule_z, rule); error = EINVAL; break; } pfi_kif_ref(rule->kif, PFI_KIF_REF_RULE); } if (rule->rtableid > 0 && rule->rtableid >= rt_numfibs) error = EBUSY; #ifdef ALTQ /* set queue IDs */ if (rule->qname[0] != 0) { if ((rule->qid = pf_qname2qid(rule->qname)) == 0) error = EBUSY; else if (rule->pqname[0] != 0) { if ((rule->pqid = pf_qname2qid(rule->pqname)) == 0) error = EBUSY; } else rule->pqid = rule->qid; } #endif if (rule->tagname[0]) if ((rule->tag = pf_tagname2tag(rule->tagname)) == 0) error = EBUSY; if (rule->match_tagname[0]) if ((rule->match_tag = pf_tagname2tag(rule->match_tagname)) == 0) error = EBUSY; if (rule->rt && !rule->direction) error = EINVAL; #if NPFLOG > 0 if (!rule->log) rule->logif = 0; if (rule->logif >= PFLOGIFS_MAX) error = EINVAL; #endif if (pf_rtlabel_add(&rule->src.addr) || pf_rtlabel_add(&rule->dst.addr)) error = EBUSY; if (pf_addr_setup(ruleset, &rule->src.addr, rule->af)) error = EINVAL; if (pf_addr_setup(ruleset, &rule->dst.addr, rule->af)) error = EINVAL; if (pf_anchor_setup(rule, ruleset, pr->anchor_call)) error = EINVAL; TAILQ_FOREACH(pa, &V_pf_pabuf, entries) if (pf_tbladdr_setup(ruleset, &pa->addr)) error = EINVAL; if (rule->overload_tblname[0]) { if ((rule->overload_tbl = pfr_attach_table(ruleset, rule->overload_tblname, 0)) == NULL) error = EINVAL; else rule->overload_tbl->pfrkt_flags |= PFR_TFLAG_ACTIVE; } pf_mv_pool(&V_pf_pabuf, &rule->rpool.list); if (((((rule->action == PF_NAT) || (rule->action == PF_RDR) || (rule->action == PF_BINAT)) && rule->anchor == NULL) || (rule->rt > PF_FASTROUTE)) && (TAILQ_FIRST(&rule->rpool.list) == NULL)) error = EINVAL; if (error) { pf_rm_rule(NULL, rule); break; } if (!V_debug_pfugidhack && (rule->uid.op || rule->gid.op || rule->log & PF_LOG_SOCKET_LOOKUP)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: debug.pfugidhack enabled\n")); V_debug_pfugidhack = 1; } rule->rpool.cur = TAILQ_FIRST(&rule->rpool.list); rule->evaluations = rule->packets[0] = rule->packets[1] = rule->bytes[0] = rule->bytes[1] = 0; TAILQ_INSERT_TAIL(ruleset->rules[rs_num].inactive.ptr, rule, entries); ruleset->rules[rs_num].inactive.rcount++; break; } case DIOCGETRULES: { struct pfioc_rule *pr = (struct pfioc_rule *)addr; struct pf_ruleset *ruleset; struct pf_rule *tail; int rs_num; pr->anchor[sizeof(pr->anchor) - 1] = 0; ruleset = pf_find_ruleset(pr->anchor); if (ruleset == NULL) { error = EINVAL; break; } rs_num = pf_get_ruleset_number(pr->rule.action); if (rs_num >= PF_RULESET_MAX) { error = EINVAL; break; } tail = TAILQ_LAST(ruleset->rules[rs_num].active.ptr, pf_rulequeue); if (tail) pr->nr = tail->nr + 1; else pr->nr = 0; pr->ticket = ruleset->rules[rs_num].active.ticket; break; } case DIOCGETRULE: { struct pfioc_rule *pr = (struct pfioc_rule *)addr; struct pf_ruleset *ruleset; struct pf_rule *rule; int rs_num, i; pr->anchor[sizeof(pr->anchor) - 1] = 0; ruleset = pf_find_ruleset(pr->anchor); if (ruleset == NULL) { error = EINVAL; break; } rs_num = pf_get_ruleset_number(pr->rule.action); if (rs_num >= PF_RULESET_MAX) { error = EINVAL; break; } if (pr->ticket != ruleset->rules[rs_num].active.ticket) { error = EBUSY; break; } rule = TAILQ_FIRST(ruleset->rules[rs_num].active.ptr); while ((rule != NULL) && (rule->nr != pr->nr)) rule = TAILQ_NEXT(rule, entries); if (rule == NULL) { error = EBUSY; break; } bcopy(rule, &pr->rule, sizeof(struct pf_rule)); if (pf_anchor_copyout(ruleset, rule, pr)) { error = EBUSY; break; } pf_addr_copyout(&pr->rule.src.addr); pf_addr_copyout(&pr->rule.dst.addr); for (i = 0; i < PF_SKIP_COUNT; ++i) if (rule->skip[i].ptr == NULL) pr->rule.skip[i].nr = -1; else pr->rule.skip[i].nr = rule->skip[i].ptr->nr; if (pr->action == PF_GET_CLR_CNTR) { rule->evaluations = 0; rule->packets[0] = rule->packets[1] = 0; rule->bytes[0] = rule->bytes[1] = 0; rule->states_tot = 0; } break; } case DIOCCHANGERULE: { struct pfioc_rule *pcr = (struct pfioc_rule *)addr; struct pf_ruleset *ruleset; struct pf_rule *oldrule = NULL, *newrule = NULL; u_int32_t nr = 0; int rs_num; if (!(pcr->action == PF_CHANGE_REMOVE || pcr->action == PF_CHANGE_GET_TICKET) && pcr->pool_ticket != V_ticket_pabuf) { error = EBUSY; break; } if (pcr->action < PF_CHANGE_ADD_HEAD || pcr->action > PF_CHANGE_GET_TICKET) { error = EINVAL; break; } ruleset = pf_find_ruleset(pcr->anchor); if (ruleset == NULL) { error = EINVAL; break; } rs_num = pf_get_ruleset_number(pcr->rule.action); if (rs_num >= PF_RULESET_MAX) { error = EINVAL; break; } if (pcr->action == PF_CHANGE_GET_TICKET) { pcr->ticket = ++ruleset->rules[rs_num].active.ticket; break; } else { if (pcr->ticket != ruleset->rules[rs_num].active.ticket) { error = EINVAL; break; } if (pcr->rule.return_icmp >> 8 > ICMP_MAXTYPE) { error = EINVAL; break; } } if (pcr->action != PF_CHANGE_REMOVE) { newrule = uma_zalloc(V_pf_rule_z, M_NOWAIT); if (newrule == NULL) { error = ENOMEM; break; } bcopy(&pcr->rule, newrule, sizeof(struct pf_rule)); newrule->cuid = td->td_ucred->cr_ruid; newrule->cpid = td->td_proc ? td->td_proc->p_pid : 0; TAILQ_INIT(&newrule->rpool.list); /* initialize refcounting */ newrule->states_cur = 0; newrule->entries.tqe_prev = NULL; #ifndef INET if (newrule->af == AF_INET) { uma_zfree(V_pf_rule_z, newrule); error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (newrule->af == AF_INET6) { uma_zfree(V_pf_rule_z, newrule); error = EAFNOSUPPORT; break; } #endif /* INET6 */ if (newrule->ifname[0]) { newrule->kif = pfi_kif_get(newrule->ifname); if (newrule->kif == NULL) { uma_zfree(V_pf_rule_z, newrule); error = EINVAL; break; } pfi_kif_ref(newrule->kif, PFI_KIF_REF_RULE); } else newrule->kif = NULL; if (newrule->rtableid > 0 && newrule->rtableid >= rt_numfibs) error = EBUSY; #ifdef ALTQ /* set queue IDs */ if (newrule->qname[0] != 0) { if ((newrule->qid = pf_qname2qid(newrule->qname)) == 0) error = EBUSY; else if (newrule->pqname[0] != 0) { if ((newrule->pqid = pf_qname2qid(newrule->pqname)) == 0) error = EBUSY; } else newrule->pqid = newrule->qid; } #endif /* ALTQ */ if (newrule->tagname[0]) if ((newrule->tag = pf_tagname2tag(newrule->tagname)) == 0) error = EBUSY; if (newrule->match_tagname[0]) if ((newrule->match_tag = pf_tagname2tag( newrule->match_tagname)) == 0) error = EBUSY; if (newrule->rt && !newrule->direction) error = EINVAL; #if NPFLOG > 0 if (!newrule->log) newrule->logif = 0; if (newrule->logif >= PFLOGIFS_MAX) error = EINVAL; #endif if (pf_rtlabel_add(&newrule->src.addr) || pf_rtlabel_add(&newrule->dst.addr)) error = EBUSY; if (pf_addr_setup(ruleset, &newrule->src.addr, newrule->af)) error = EINVAL; if (pf_addr_setup(ruleset, &newrule->dst.addr, newrule->af)) error = EINVAL; if (pf_anchor_setup(newrule, ruleset, pcr->anchor_call)) error = EINVAL; TAILQ_FOREACH(pa, &V_pf_pabuf, entries) if (pf_tbladdr_setup(ruleset, &pa->addr)) error = EINVAL; if (newrule->overload_tblname[0]) { if ((newrule->overload_tbl = pfr_attach_table( ruleset, newrule->overload_tblname, 0)) == NULL) error = EINVAL; else newrule->overload_tbl->pfrkt_flags |= PFR_TFLAG_ACTIVE; } pf_mv_pool(&V_pf_pabuf, &newrule->rpool.list); if (((((newrule->action == PF_NAT) || (newrule->action == PF_RDR) || (newrule->action == PF_BINAT) || (newrule->rt > PF_FASTROUTE)) && !newrule->anchor)) && (TAILQ_FIRST(&newrule->rpool.list) == NULL)) error = EINVAL; if (error) { pf_rm_rule(NULL, newrule); break; } if (!V_debug_pfugidhack && (newrule->uid.op || newrule->gid.op || newrule->log & PF_LOG_SOCKET_LOOKUP)) { DPFPRINTF(PF_DEBUG_MISC, ("pf: debug.pfugidhack enabled\n")); V_debug_pfugidhack = 1; } newrule->rpool.cur = TAILQ_FIRST(&newrule->rpool.list); newrule->evaluations = 0; newrule->packets[0] = newrule->packets[1] = 0; newrule->bytes[0] = newrule->bytes[1] = 0; } pf_empty_pool(&V_pf_pabuf); if (pcr->action == PF_CHANGE_ADD_HEAD) oldrule = TAILQ_FIRST( ruleset->rules[rs_num].active.ptr); else if (pcr->action == PF_CHANGE_ADD_TAIL) oldrule = TAILQ_LAST( ruleset->rules[rs_num].active.ptr, pf_rulequeue); else { oldrule = TAILQ_FIRST( ruleset->rules[rs_num].active.ptr); while ((oldrule != NULL) && (oldrule->nr != pcr->nr)) oldrule = TAILQ_NEXT(oldrule, entries); if (oldrule == NULL) { if (newrule != NULL) pf_rm_rule(NULL, newrule); error = EINVAL; break; } } if (pcr->action == PF_CHANGE_REMOVE) { pf_rm_rule(ruleset->rules[rs_num].active.ptr, oldrule); ruleset->rules[rs_num].active.rcount--; } else { if (oldrule == NULL) TAILQ_INSERT_TAIL( ruleset->rules[rs_num].active.ptr, 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( ruleset->rules[rs_num].active.ptr, oldrule, newrule, entries); ruleset->rules[rs_num].active.rcount++; } nr = 0; TAILQ_FOREACH(oldrule, ruleset->rules[rs_num].active.ptr, entries) oldrule->nr = nr++; ruleset->rules[rs_num].active.ticket++; pf_calc_skip_steps(ruleset->rules[rs_num].active.ptr); pf_remove_if_empty_ruleset(ruleset); break; } case DIOCCLRSTATES: { struct pf_state *s, *nexts; struct pfioc_state_kill *psk = (struct pfioc_state_kill *)addr; u_int killed = 0; PF_KEYS_LOCK(); PF_IDS_LOCK(); for (s = RB_MIN(pf_state_tree_id, &V_tree_id); s; s = nexts) { nexts = RB_NEXT(pf_state_tree_id, &V_tree_id, s); if (!psk->psk_ifname[0] || !strcmp(psk->psk_ifname, s->kif->pfik_name)) { /* don't send out individual delete messages */ SET(s->state_flags, PFSTATE_NOSYNC); pf_unlink_state(s, 1); killed++; } } PF_IDS_UNLOCK(); PF_KEYS_UNLOCK(); psk->psk_killed = killed; if (pfsync_clear_states_ptr != NULL) pfsync_clear_states_ptr(V_pf_status.hostid, psk->psk_ifname); break; } case DIOCKILLSTATES: { struct pf_state *s, *nexts; struct pf_state_key *sk; struct pf_addr *srcaddr, *dstaddr; u_int16_t srcport, dstport; struct pfioc_state_kill *psk = (struct pfioc_state_kill *)addr; u_int killed = 0; if (psk->psk_pfcmp.id) { if (psk->psk_pfcmp.creatorid == 0) psk->psk_pfcmp.creatorid = V_pf_status.hostid; if ((s = pf_find_state_byid(&psk->psk_pfcmp))) { pf_unlink_state(s, 0); psk->psk_killed = 1; } break; } PF_KEYS_LOCK(); PF_IDS_LOCK(); for (s = RB_MIN(pf_state_tree_id, &V_tree_id); s; s = nexts) { nexts = RB_NEXT(pf_state_tree_id, &V_tree_id, s); sk = s->key[PF_SK_WIRE]; if (s->direction == PF_OUT) { srcaddr = &sk->addr[1]; dstaddr = &sk->addr[0]; srcport = sk->port[0]; dstport = sk->port[0]; } else { srcaddr = &sk->addr[0]; dstaddr = &sk->addr[1]; srcport = sk->port[0]; dstport = sk->port[0]; } if ((!psk->psk_af || sk->af == psk->psk_af) && (!psk->psk_proto || psk->psk_proto == sk->proto) && PF_MATCHA(psk->psk_src.neg, &psk->psk_src.addr.v.a.addr, &psk->psk_src.addr.v.a.mask, srcaddr, sk->af) && PF_MATCHA(psk->psk_dst.neg, &psk->psk_dst.addr.v.a.addr, &psk->psk_dst.addr.v.a.mask, dstaddr, sk->af) && (psk->psk_src.port_op == 0 || pf_match_port(psk->psk_src.port_op, psk->psk_src.port[0], psk->psk_src.port[1], srcport)) && (psk->psk_dst.port_op == 0 || pf_match_port(psk->psk_dst.port_op, psk->psk_dst.port[0], psk->psk_dst.port[1], dstport)) && (!psk->psk_label[0] || (s->rule.ptr->label[0] && !strcmp(psk->psk_label, s->rule.ptr->label))) && (!psk->psk_ifname[0] || !strcmp(psk->psk_ifname, s->kif->pfik_name))) { pf_unlink_state(s, 1); killed++; } } PF_IDS_UNLOCK(); PF_KEYS_UNLOCK(); psk->psk_killed = killed; break; } case DIOCADDSTATE: { struct pfioc_state *ps = (struct pfioc_state *)addr; struct pfsync_state *sp = &ps->state; if (sp->timeout >= PFTM_MAX && sp->timeout != PFTM_UNTIL_PACKET) { error = EINVAL; break; } if (pfsync_state_import_ptr != NULL) error = pfsync_state_import_ptr(sp, PFSYNC_SI_IOCTL); break; } case DIOCGETSTATE: { struct pfioc_state *ps = (struct pfioc_state *)addr; struct pf_state *s; struct pf_state_cmp id_key; bcopy(ps->state.id, &id_key.id, sizeof(id_key.id)); id_key.creatorid = ps->state.creatorid; s = pf_find_state_byid(&id_key); if (s == NULL) { error = ENOENT; break; } pfsync_state_export(&ps->state, s); break; } case DIOCGETSTATES: { struct pfioc_states *ps = (struct pfioc_states *)addr; struct pf_state *state; struct pfsync_state *p, pstore; u_int32_t nr = 0; if (ps->ps_len == 0) { nr = V_pf_status.states; ps->ps_len = sizeof(struct pfsync_state) * nr; break; } p = ps->ps_states; PF_LIST_RLOCK(); state = TAILQ_FIRST(&V_state_list); while (state) { if (state->timeout != PFTM_UNLINKED) { if ((nr+1) * sizeof(*p) > (unsigned)ps->ps_len) break; pfsync_state_export(&pstore, state); PF_LIST_RUNLOCK(); /* XXXGL: ref state? */ PF_UNLOCK(); error = copyout(&pstore, p, sizeof(*p)); PF_LOCK(); if (error) goto fail; PF_LIST_RLOCK(); p++; nr++; } state = TAILQ_NEXT(state, entry_list); } PF_LIST_RUNLOCK(); ps->ps_len = sizeof(struct pfsync_state) * nr; break; } case DIOCGETSTATUS: { struct pf_status *s = (struct pf_status *)addr; bcopy(&V_pf_status, s, sizeof(struct pf_status)); pfi_update_status(s->ifname, s); break; } case DIOCSETSTATUSIF: { struct pfioc_if *pi = (struct pfioc_if *)addr; if (pi->ifname[0] == 0) { bzero(V_pf_status.ifname, IFNAMSIZ); break; } strlcpy(V_pf_status.ifname, pi->ifname, IFNAMSIZ); break; } case DIOCCLRSTATUS: { bzero(V_pf_status.counters, sizeof(V_pf_status.counters)); bzero(V_pf_status.fcounters, sizeof(V_pf_status.fcounters)); bzero(V_pf_status.scounters, sizeof(V_pf_status.scounters)); V_pf_status.since = time_second; if (*V_pf_status.ifname) pfi_update_status(V_pf_status.ifname, NULL); break; } case DIOCNATLOOK: { struct pfioc_natlook *pnl = (struct pfioc_natlook *)addr; struct pf_state_key *sk; struct pf_state *state; struct pf_state_key_cmp key; int m = 0, direction = pnl->direction; int sidx, didx; /* NATLOOK src and dst are reversed, so reverse sidx/didx */ sidx = (direction == PF_IN) ? 1 : 0; didx = (direction == PF_IN) ? 0 : 1; if (!pnl->proto || PF_AZERO(&pnl->saddr, pnl->af) || PF_AZERO(&pnl->daddr, pnl->af) || ((pnl->proto == IPPROTO_TCP || pnl->proto == IPPROTO_UDP) && (!pnl->dport || !pnl->sport))) error = EINVAL; else { key.af = pnl->af; key.proto = pnl->proto; PF_ACPY(&key.addr[sidx], &pnl->saddr, pnl->af); key.port[sidx] = pnl->sport; PF_ACPY(&key.addr[didx], &pnl->daddr, pnl->af); key.port[didx] = pnl->dport; state = pf_find_state_all(&key, direction, &m); if (m > 1) error = E2BIG; /* more than one state */ else if (state != NULL) { sk = state->key[sidx]; PF_ACPY(&pnl->rsaddr, &sk->addr[sidx], sk->af); pnl->rsport = sk->port[sidx]; PF_ACPY(&pnl->rdaddr, &sk->addr[didx], sk->af); pnl->rdport = sk->port[didx]; } else error = ENOENT; } 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 = V_pf_default_rule.timeout[pt->timeout]; if (pt->timeout == PFTM_INTERVAL && pt->seconds == 0) pt->seconds = 1; V_pf_default_rule.timeout[pt->timeout] = pt->seconds; if (pt->timeout == PFTM_INTERVAL && pt->seconds < old) wakeup(pf_purge_thread); 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 = V_pf_default_rule.timeout[pt->timeout]; break; } case DIOCGETLIMIT: { struct pfioc_limit *pl = (struct pfioc_limit *)addr; if (pl->index < 0 || pl->index >= PF_LIMIT_MAX) { error = EINVAL; goto fail; } pl->limit = V_pf_pool_limits[pl->index].limit; break; } case DIOCSETLIMIT: { struct pfioc_limit *pl = (struct pfioc_limit *)addr; int old_limit; if (pl->index < 0 || pl->index >= PF_LIMIT_MAX || V_pf_pool_limits[pl->index].pp == NULL) { error = EINVAL; goto fail; } uma_zone_set_max(V_pf_pool_limits[pl->index].pp, pl->limit); old_limit = V_pf_pool_limits[pl->index].limit; V_pf_pool_limits[pl->index].limit = pl->limit; pl->limit = old_limit; break; } case DIOCSETDEBUG: { u_int32_t *level = (u_int32_t *)addr; V_pf_status.debug = *level; break; } case DIOCCLRRULECTRS: { /* obsoleted by DIOCGETRULE with action=PF_GET_CLR_CNTR */ struct pf_ruleset *ruleset = &pf_main_ruleset; struct pf_rule *rule; TAILQ_FOREACH(rule, ruleset->rules[PF_RULESET_FILTER].active.ptr, entries) { rule->evaluations = 0; rule->packets[0] = rule->packets[1] = 0; rule->bytes[0] = rule->bytes[1] = 0; } break; } case DIOCGIFSPEED: { struct pf_ifspeed *psp = (struct pf_ifspeed *)addr; struct pf_ifspeed ps; struct ifnet *ifp; if (psp->ifname[0] != 0) { /* Can we completely trust user-land? */ strlcpy(ps.ifname, psp->ifname, IFNAMSIZ); ifp = ifunit(ps.ifname); if (ifp != NULL) psp->baudrate = ifp->if_baudrate; else error = EINVAL; } else error = EINVAL; break; } #ifdef ALTQ case DIOCSTARTALTQ: { struct pf_altq *altq; /* enable all altq interfaces on active list */ TAILQ_FOREACH(altq, V_pf_altqs_active, entries) { if (altq->qname[0] == 0 && (altq->local_flags & PFALTQ_FLAG_IF_REMOVED) == 0) { error = pf_enable_altq(altq); if (error != 0) break; } } if (error == 0) V_pf_altq_running = 1; DPFPRINTF(PF_DEBUG_MISC, ("altq: started\n")); break; } case DIOCSTOPALTQ: { struct pf_altq *altq; /* disable all altq interfaces on active list */ TAILQ_FOREACH(altq, V_pf_altqs_active, entries) { if (altq->qname[0] == 0 && (altq->local_flags & PFALTQ_FLAG_IF_REMOVED) == 0) { error = pf_disable_altq(altq); if (error != 0) break; } } if (error == 0) V_pf_altq_running = 0; DPFPRINTF(PF_DEBUG_MISC, ("altq: stopped\n")); break; } case DIOCADDALTQ: { struct pfioc_altq *pa = (struct pfioc_altq *)addr; struct pf_altq *altq, *a; if (pa->ticket != V_ticket_altqs_inactive) { error = EBUSY; break; } altq = uma_zalloc(V_pf_altq_z, M_NOWAIT); if (altq == NULL) { error = ENOMEM; break; } bcopy(&pa->altq, altq, sizeof(struct pf_altq)); altq->local_flags = 0; /* * if this is for a queue, find the discipline and * copy the necessary fields */ if (altq->qname[0] != 0) { if ((altq->qid = pf_qname2qid(altq->qname)) == 0) { error = EBUSY; uma_zfree(V_pf_altq_z, altq); break; } altq->altq_disc = NULL; TAILQ_FOREACH(a, V_pf_altqs_inactive, entries) { if (strncmp(a->ifname, altq->ifname, IFNAMSIZ) == 0 && a->qname[0] == 0) { altq->altq_disc = a->altq_disc; break; } } } struct ifnet *ifp; if ((ifp = ifunit(altq->ifname)) == NULL) { altq->local_flags |= PFALTQ_FLAG_IF_REMOVED; } else { PF_UNLOCK(); error = altq_add(altq); PF_LOCK(); } if (error) { uma_zfree(V_pf_altq_z, altq); break; } TAILQ_INSERT_TAIL(V_pf_altqs_inactive, altq, entries); bcopy(altq, &pa->altq, sizeof(struct pf_altq)); break; } case DIOCGETALTQS: { struct pfioc_altq *pa = (struct pfioc_altq *)addr; struct pf_altq *altq; pa->nr = 0; TAILQ_FOREACH(altq, V_pf_altqs_active, entries) pa->nr++; pa->ticket = V_ticket_altqs_active; break; } case DIOCGETALTQ: { struct pfioc_altq *pa = (struct pfioc_altq *)addr; struct pf_altq *altq; u_int32_t nr; if (pa->ticket != V_ticket_altqs_active) { error = EBUSY; break; } nr = 0; altq = TAILQ_FIRST(V_pf_altqs_active); while ((altq != NULL) && (nr < pa->nr)) { altq = TAILQ_NEXT(altq, entries); nr++; } if (altq == NULL) { error = EBUSY; break; } bcopy(altq, &pa->altq, sizeof(struct pf_altq)); break; } case DIOCCHANGEALTQ: /* CHANGEALTQ not supported yet! */ error = ENODEV; break; case DIOCGETQSTATS: { struct pfioc_qstats *pq = (struct pfioc_qstats *)addr; struct pf_altq *altq; u_int32_t nr; int nbytes; if (pq->ticket != V_ticket_altqs_active) { error = EBUSY; break; } nbytes = pq->nbytes; nr = 0; altq = TAILQ_FIRST(V_pf_altqs_active); while ((altq != NULL) && (nr < pq->nr)) { altq = TAILQ_NEXT(altq, entries); nr++; } if (altq == NULL) { error = EBUSY; break; } if ((altq->local_flags & PFALTQ_FLAG_IF_REMOVED) != 0) { error = ENXIO; break; } PF_UNLOCK(); error = altq_getqstats(altq, pq->buf, &nbytes); PF_LOCK(); if (error == 0) { pq->scheduler = altq->scheduler; pq->nbytes = nbytes; } break; } #endif /* ALTQ */ case DIOCBEGINADDRS: { struct pfioc_pooladdr *pp = (struct pfioc_pooladdr *)addr; pf_empty_pool(&V_pf_pabuf); pp->ticket = ++V_ticket_pabuf; break; } case DIOCADDADDR: { struct pfioc_pooladdr *pp = (struct pfioc_pooladdr *)addr; if (pp->ticket != V_ticket_pabuf) { error = EBUSY; break; } #ifndef INET if (pp->af == AF_INET) { error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (pp->af == AF_INET6) { error = EAFNOSUPPORT; break; } #endif /* INET6 */ if (pp->addr.addr.type != PF_ADDR_ADDRMASK && pp->addr.addr.type != PF_ADDR_DYNIFTL && pp->addr.addr.type != PF_ADDR_TABLE) { error = EINVAL; break; } pa = uma_zalloc(V_pf_pooladdr_z, M_NOWAIT); if (pa == NULL) { error = ENOMEM; break; } bcopy(&pp->addr, pa, sizeof(struct pf_pooladdr)); if (pa->ifname[0]) { pa->kif = pfi_kif_get(pa->ifname); if (pa->kif == NULL) { uma_zfree(V_pf_pooladdr_z, pa); error = EINVAL; break; } pfi_kif_ref(pa->kif, PFI_KIF_REF_RULE); } if (pfi_dynaddr_setup(&pa->addr, pp->af)) { pfi_dynaddr_remove(&pa->addr); pfi_kif_unref(pa->kif, PFI_KIF_REF_RULE); uma_zfree(V_pf_pooladdr_z, pa); error = EINVAL; break; } TAILQ_INSERT_TAIL(&V_pf_pabuf, pa, entries); break; } case DIOCGETADDRS: { struct pfioc_pooladdr *pp = (struct pfioc_pooladdr *)addr; pp->nr = 0; pool = pf_get_pool(pp->anchor, pp->ticket, pp->r_action, pp->r_num, 0, 1, 0); if (pool == NULL) { error = EBUSY; break; } TAILQ_FOREACH(pa, &pool->list, entries) pp->nr++; break; } case DIOCGETADDR: { struct pfioc_pooladdr *pp = (struct pfioc_pooladdr *)addr; u_int32_t nr = 0; pool = pf_get_pool(pp->anchor, pp->ticket, pp->r_action, pp->r_num, 0, 1, 1); if (pool == NULL) { error = EBUSY; break; } pa = TAILQ_FIRST(&pool->list); while ((pa != NULL) && (nr < pp->nr)) { pa = TAILQ_NEXT(pa, entries); nr++; } if (pa == NULL) { error = EBUSY; break; } bcopy(pa, &pp->addr, sizeof(struct pf_pooladdr)); pf_addr_copyout(&pp->addr.addr); break; } case DIOCCHANGEADDR: { struct pfioc_pooladdr *pca = (struct pfioc_pooladdr *)addr; struct pf_pooladdr *oldpa = NULL, *newpa = NULL; struct pf_ruleset *ruleset; if (pca->action < PF_CHANGE_ADD_HEAD || pca->action > PF_CHANGE_REMOVE) { error = EINVAL; break; } if (pca->addr.addr.type != PF_ADDR_ADDRMASK && pca->addr.addr.type != PF_ADDR_DYNIFTL && pca->addr.addr.type != PF_ADDR_TABLE) { error = EINVAL; break; } ruleset = pf_find_ruleset(pca->anchor); if (ruleset == NULL) { error = EBUSY; break; } pool = pf_get_pool(pca->anchor, pca->ticket, pca->r_action, pca->r_num, pca->r_last, 1, 1); if (pool == NULL) { error = EBUSY; break; } if (pca->action != PF_CHANGE_REMOVE) { newpa = uma_zalloc(V_pf_pooladdr_z, M_NOWAIT); if (newpa == NULL) { error = ENOMEM; break; } bcopy(&pca->addr, newpa, sizeof(struct pf_pooladdr)); #ifndef INET if (pca->af == AF_INET) { uma_zfree(V_pf_pooladdr_z, newpa); error = EAFNOSUPPORT; break; } #endif /* INET */ #ifndef INET6 if (pca->af == AF_INET6) { uma_zfree(V_pf_pooladdr_z, newpa); error = EAFNOSUPPORT; break; } #endif /* INET6 */ if (newpa->ifname[0]) { newpa->kif = pfi_kif_get(newpa->ifname); if (newpa->kif == NULL) { uma_zfree(V_pf_pooladdr_z, newpa); error = EINVAL; break; } pfi_kif_ref(newpa->kif, PFI_KIF_REF_RULE); } else newpa->kif = NULL; if (pfi_dynaddr_setup(&newpa->addr, pca->af) || pf_tbladdr_setup(ruleset, &newpa->addr)) { pfi_dynaddr_remove(&newpa->addr); pfi_kif_unref(newpa->kif, PFI_KIF_REF_RULE); uma_zfree(V_pf_pooladdr_z, newpa); error = EINVAL; break; } } if (pca->action == PF_CHANGE_ADD_HEAD) oldpa = TAILQ_FIRST(&pool->list); else if (pca->action == PF_CHANGE_ADD_TAIL) oldpa = TAILQ_LAST(&pool->list, pf_palist); else { int i = 0; oldpa = TAILQ_FIRST(&pool->list); while ((oldpa != NULL) && (i < pca->nr)) { oldpa = TAILQ_NEXT(oldpa, entries); i++; } if (oldpa == NULL) { error = EINVAL; break; } } if (pca->action == PF_CHANGE_REMOVE) { TAILQ_REMOVE(&pool->list, oldpa, entries); pfi_dynaddr_remove(&oldpa->addr); pf_tbladdr_remove(&oldpa->addr); pfi_kif_unref(oldpa->kif, PFI_KIF_REF_RULE); uma_zfree(V_pf_pooladdr_z, oldpa); } else { if (oldpa == NULL) TAILQ_INSERT_TAIL(&pool->list, newpa, entries); else if (pca->action == PF_CHANGE_ADD_HEAD || pca->action == PF_CHANGE_ADD_BEFORE) TAILQ_INSERT_BEFORE(oldpa, newpa, entries); else TAILQ_INSERT_AFTER(&pool->list, oldpa, newpa, entries); } pool->cur = TAILQ_FIRST(&pool->list); PF_ACPY(&pool->counter, &pool->cur->addr.v.a.addr, pca->af); break; } case DIOCGETRULESETS: { struct pfioc_ruleset *pr = (struct pfioc_ruleset *)addr; struct pf_ruleset *ruleset; struct pf_anchor *anchor; pr->path[sizeof(pr->path) - 1] = 0; if ((ruleset = pf_find_ruleset(pr->path)) == NULL) { error = EINVAL; break; } pr->nr = 0; if (ruleset->anchor == NULL) { /* XXX kludge for pf_main_ruleset */ RB_FOREACH(anchor, pf_anchor_global, &V_pf_anchors) if (anchor->parent == NULL) pr->nr++; } else { RB_FOREACH(anchor, pf_anchor_node, &ruleset->anchor->children) pr->nr++; } break; } case DIOCGETRULESET: { struct pfioc_ruleset *pr = (struct pfioc_ruleset *)addr; struct pf_ruleset *ruleset; struct pf_anchor *anchor; u_int32_t nr = 0; pr->path[sizeof(pr->path) - 1] = 0; if ((ruleset = pf_find_ruleset(pr->path)) == NULL) { error = EINVAL; break; } pr->name[0] = 0; if (ruleset->anchor == NULL) { /* XXX kludge for pf_main_ruleset */ RB_FOREACH(anchor, pf_anchor_global, &V_pf_anchors) if (anchor->parent == NULL && nr++ == pr->nr) { strlcpy(pr->name, anchor->name, sizeof(pr->name)); break; } } else { RB_FOREACH(anchor, pf_anchor_node, &ruleset->anchor->children) if (nr++ == pr->nr) { strlcpy(pr->name, anchor->name, sizeof(pr->name)); break; } } if (!pr->name[0]) error = EBUSY; break; } case DIOCRCLRTABLES: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != 0) { error = ENODEV; break; } error = pfr_clr_tables(&io->pfrio_table, &io->pfrio_ndel, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRADDTABLES: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_table)) { error = ENODEV; break; } error = pfr_add_tables(io->pfrio_buffer, io->pfrio_size, &io->pfrio_nadd, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRDELTABLES: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_table)) { error = ENODEV; break; } error = pfr_del_tables(io->pfrio_buffer, io->pfrio_size, &io->pfrio_ndel, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRGETTABLES: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_table)) { error = ENODEV; break; } error = pfr_get_tables(&io->pfrio_table, io->pfrio_buffer, &io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRGETTSTATS: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_tstats)) { error = ENODEV; break; } error = pfr_get_tstats(&io->pfrio_table, io->pfrio_buffer, &io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRCLRTSTATS: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_table)) { error = ENODEV; break; } error = pfr_clr_tstats(io->pfrio_buffer, io->pfrio_size, &io->pfrio_nzero, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRSETTFLAGS: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_table)) { error = ENODEV; break; } error = pfr_set_tflags(io->pfrio_buffer, io->pfrio_size, io->pfrio_setflag, io->pfrio_clrflag, &io->pfrio_nchange, &io->pfrio_ndel, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRCLRADDRS: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != 0) { error = ENODEV; break; } error = pfr_clr_addrs(&io->pfrio_table, &io->pfrio_ndel, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRADDADDRS: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_addr)) { error = ENODEV; break; } error = pfr_add_addrs(&io->pfrio_table, io->pfrio_buffer, io->pfrio_size, &io->pfrio_nadd, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRDELADDRS: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_addr)) { error = ENODEV; break; } error = pfr_del_addrs(&io->pfrio_table, io->pfrio_buffer, io->pfrio_size, &io->pfrio_ndel, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRSETADDRS: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_addr)) { error = ENODEV; break; } error = pfr_set_addrs(&io->pfrio_table, io->pfrio_buffer, io->pfrio_size, &io->pfrio_size2, &io->pfrio_nadd, &io->pfrio_ndel, &io->pfrio_nchange, io->pfrio_flags | PFR_FLAG_USERIOCTL, 0); break; } case DIOCRGETADDRS: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_addr)) { error = ENODEV; break; } error = pfr_get_addrs(&io->pfrio_table, io->pfrio_buffer, &io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRGETASTATS: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_astats)) { error = ENODEV; break; } error = pfr_get_astats(&io->pfrio_table, io->pfrio_buffer, &io->pfrio_size, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRCLRASTATS: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_addr)) { error = ENODEV; break; } error = pfr_clr_astats(&io->pfrio_table, io->pfrio_buffer, io->pfrio_size, &io->pfrio_nzero, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRTSTADDRS: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_addr)) { error = ENODEV; break; } error = pfr_tst_addrs(&io->pfrio_table, io->pfrio_buffer, io->pfrio_size, &io->pfrio_nmatch, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCRINADEFINE: { struct pfioc_table *io = (struct pfioc_table *)addr; if (io->pfrio_esize != sizeof(struct pfr_addr)) { error = ENODEV; break; } error = pfr_ina_define(&io->pfrio_table, io->pfrio_buffer, io->pfrio_size, &io->pfrio_nadd, &io->pfrio_naddr, io->pfrio_ticket, io->pfrio_flags | PFR_FLAG_USERIOCTL); break; } case DIOCOSFPADD: { struct pf_osfp_ioctl *io = (struct pf_osfp_ioctl *)addr; error = pf_osfp_add(io); break; } case DIOCOSFPGET: { struct pf_osfp_ioctl *io = (struct pf_osfp_ioctl *)addr; error = pf_osfp_get(io); break; } case DIOCXBEGIN: { struct pfioc_trans *io = (struct pfioc_trans *)addr; struct pfioc_trans_e *ioe; struct pfr_table *table; int i; if (io->esize != sizeof(*ioe)) { error = ENODEV; goto fail; } PF_UNLOCK(); ioe = malloc(sizeof(*ioe), M_TEMP, M_WAITOK); table = malloc(sizeof(*table), M_TEMP, M_WAITOK); PF_LOCK(); for (i = 0; i < io->size; i++) { PF_COPYIN(io->array+i, ioe, sizeof(*ioe), error); if (error) { free(table, M_TEMP); free(ioe, M_TEMP); error = EFAULT; goto fail; } switch (ioe->rs_num) { #ifdef ALTQ case PF_RULESET_ALTQ: if (ioe->anchor[0]) { free(table, M_TEMP); free(ioe, M_TEMP); error = EINVAL; goto fail; } if ((error = pf_begin_altq(&ioe->ticket))) { free(table, M_TEMP); free(ioe, M_TEMP); goto fail; } break; #endif /* ALTQ */ case PF_RULESET_TABLE: bzero(table, sizeof(*table)); strlcpy(table->pfrt_anchor, ioe->anchor, sizeof(table->pfrt_anchor)); if ((error = pfr_ina_begin(table, &ioe->ticket, NULL, 0))) { free(table, M_TEMP); free(ioe, M_TEMP); goto fail; } break; default: if ((error = pf_begin_rules(&ioe->ticket, ioe->rs_num, ioe->anchor))) { free(table, M_TEMP); free(ioe, M_TEMP); goto fail; } break; } PF_COPYOUT(ioe, io->array+i, sizeof(io->array[i]), error); if (error) { free(table, M_TEMP); free(ioe, M_TEMP); error = EFAULT; goto fail; } } free(table, M_TEMP); free(ioe, M_TEMP); break; } case DIOCXROLLBACK: { struct pfioc_trans *io = (struct pfioc_trans *)addr; struct pfioc_trans_e *ioe; struct pfr_table *table; int i; if (io->esize != sizeof(*ioe)) { error = ENODEV; goto fail; } PF_UNLOCK(); ioe = malloc(sizeof(*ioe), M_TEMP, M_WAITOK); table = malloc(sizeof(*table), M_TEMP, M_WAITOK); PF_LOCK(); for (i = 0; i < io->size; i++) { PF_COPYIN(io->array+i, ioe, sizeof(*ioe), error); if (error) { free(table, M_TEMP); free(ioe, M_TEMP); error = EFAULT; goto fail; } switch (ioe->rs_num) { #ifdef ALTQ case PF_RULESET_ALTQ: if (ioe->anchor[0]) { free(table, M_TEMP); free(ioe, M_TEMP); error = EINVAL; goto fail; } if ((error = pf_rollback_altq(ioe->ticket))) { free(table, M_TEMP); free(ioe, M_TEMP); goto fail; /* really bad */ } break; #endif /* ALTQ */ case PF_RULESET_TABLE: bzero(table, sizeof(*table)); strlcpy(table->pfrt_anchor, ioe->anchor, sizeof(table->pfrt_anchor)); if ((error = pfr_ina_rollback(table, ioe->ticket, NULL, 0))) { free(table, M_TEMP); free(ioe, M_TEMP); goto fail; /* really bad */ } break; default: if ((error = pf_rollback_rules(ioe->ticket, ioe->rs_num, ioe->anchor))) { free(table, M_TEMP); free(ioe, M_TEMP); goto fail; /* really bad */ } break; } } free(table, M_TEMP); free(ioe, M_TEMP); break; } case DIOCXCOMMIT: { struct pfioc_trans *io = (struct pfioc_trans *)addr; struct pfioc_trans_e *ioe; struct pfr_table *table; struct pf_ruleset *rs; int i; if (io->esize != sizeof(*ioe)) { error = ENODEV; goto fail; } PF_UNLOCK(); ioe = malloc(sizeof(*ioe), M_TEMP, M_WAITOK); table = malloc(sizeof(*table), M_TEMP, M_WAITOK); PF_LOCK(); /* first makes sure everything will succeed */ for (i = 0; i < io->size; i++) { PF_COPYIN(io->array+i, ioe, sizeof(*ioe), error); if (error) { free(table, M_TEMP); free(ioe, M_TEMP); error = EFAULT; goto fail; } switch (ioe->rs_num) { #ifdef ALTQ case PF_RULESET_ALTQ: if (ioe->anchor[0]) { free(table, M_TEMP); free(ioe, M_TEMP); error = EINVAL; goto fail; } if (!V_altqs_inactive_open || ioe->ticket != V_ticket_altqs_inactive) { free(table, M_TEMP); free(ioe, M_TEMP); error = EBUSY; goto fail; } break; #endif /* ALTQ */ case PF_RULESET_TABLE: rs = pf_find_ruleset(ioe->anchor); if (rs == NULL || !rs->topen || ioe->ticket != rs->tticket) { free(table, M_TEMP); free(ioe, M_TEMP); error = EBUSY; goto fail; } break; default: if (ioe->rs_num < 0 || ioe->rs_num >= PF_RULESET_MAX) { free(table, M_TEMP); free(ioe, M_TEMP); error = EINVAL; goto fail; } rs = pf_find_ruleset(ioe->anchor); if (rs == NULL || !rs->rules[ioe->rs_num].inactive.open || rs->rules[ioe->rs_num].inactive.ticket != ioe->ticket) { free(table, M_TEMP); free(ioe, M_TEMP); error = EBUSY; goto fail; } break; } } /* now do the commit - no errors should happen here */ for (i = 0; i < io->size; i++) { PF_COPYIN(io->array+i, ioe, sizeof(*ioe), error); if (error) { free(table, M_TEMP); free(ioe, M_TEMP); error = EFAULT; goto fail; } switch (ioe->rs_num) { #ifdef ALTQ case PF_RULESET_ALTQ: if ((error = pf_commit_altq(ioe->ticket))) { free(table, M_TEMP); free(ioe, M_TEMP); goto fail; /* really bad */ } break; #endif /* ALTQ */ case PF_RULESET_TABLE: bzero(table, sizeof(*table)); strlcpy(table->pfrt_anchor, ioe->anchor, sizeof(table->pfrt_anchor)); if ((error = pfr_ina_commit(table, ioe->ticket, NULL, NULL, 0))) { free(table, M_TEMP); free(ioe, M_TEMP); goto fail; /* really bad */ } break; default: if ((error = pf_commit_rules(ioe->ticket, ioe->rs_num, ioe->anchor))) { free(table, M_TEMP); free(ioe, M_TEMP); goto fail; /* really bad */ } break; } } free(table, M_TEMP); free(ioe, M_TEMP); break; } case DIOCGETSRCNODES: { struct pfioc_src_nodes *psn = (struct pfioc_src_nodes *)addr; struct pf_src_node *n, *p, *pstore; u_int32_t nr = 0; int space = psn->psn_len; if (space == 0) { RB_FOREACH(n, pf_src_tree, &V_tree_src_tracking) nr++; psn->psn_len = sizeof(struct pf_src_node) * nr; break; } PF_UNLOCK(); pstore = malloc(sizeof(*pstore), M_TEMP, M_WAITOK); PF_LOCK(); p = psn->psn_src_nodes; RB_FOREACH(n, pf_src_tree, &V_tree_src_tracking) { int secs = time_second, diff; if ((nr + 1) * sizeof(*p) > (unsigned)psn->psn_len) break; bcopy(n, pstore, sizeof(*pstore)); if (n->rule.ptr != NULL) pstore->rule.nr = n->rule.ptr->nr; pstore->creation = secs - pstore->creation; if (pstore->expire > secs) pstore->expire -= secs; else pstore->expire = 0; /* adjust the connection rate estimate */ diff = secs - n->conn_rate.last; if (diff >= n->conn_rate.seconds) pstore->conn_rate.count = 0; else pstore->conn_rate.count -= n->conn_rate.count * diff / n->conn_rate.seconds; PF_COPYOUT(pstore, p, sizeof(*p), error); if (error) { free(pstore, M_TEMP); goto fail; } p++; nr++; } psn->psn_len = sizeof(struct pf_src_node) * nr; free(pstore, M_TEMP); break; } case DIOCCLRSRCNODES: { struct pf_src_node *n; struct pf_state *state; PF_IDS_LOCK(); RB_FOREACH(state, pf_state_tree_id, &V_tree_id) { state->src_node = NULL; state->nat_src_node = NULL; } PF_IDS_UNLOCK(); PF_KEYS_LOCK(); RB_FOREACH(n, pf_src_tree, &V_tree_src_tracking) { n->expire = 1; n->states = 0; } PF_KEYS_UNLOCK(); pf_purge_expired_src_nodes(1); V_pf_status.src_nodes = 0; break; } case DIOCKILLSRCNODES: { struct pf_src_node *sn; struct pf_state *s; struct pfioc_src_node_kill *psnk = (struct pfioc_src_node_kill *)addr; u_int killed = 0; PF_KEYS_LOCK(); RB_FOREACH(sn, pf_src_tree, &V_tree_src_tracking) { if (PF_MATCHA(psnk->psnk_src.neg, &psnk->psnk_src.addr.v.a.addr, &psnk->psnk_src.addr.v.a.mask, &sn->addr, sn->af) && PF_MATCHA(psnk->psnk_dst.neg, &psnk->psnk_dst.addr.v.a.addr, &psnk->psnk_dst.addr.v.a.mask, &sn->raddr, sn->af)) { /* Handle state to src_node linkage */ if (sn->states != 0) { PF_IDS_LOCK(); RB_FOREACH(s, pf_state_tree_id, &V_tree_id) { if (s->src_node == sn) s->src_node = NULL; if (s->nat_src_node == sn) s->nat_src_node = NULL; } PF_IDS_UNLOCK(); sn->states = 0; } sn->expire = 1; killed++; } } PF_KEYS_UNLOCK(); if (killed > 0) pf_purge_expired_src_nodes(1); psnk->psnk_killed = killed; break; } case DIOCSETHOSTID: { u_int32_t *hostid = (u_int32_t *)addr; if (*hostid == 0) V_pf_status.hostid = arc4random(); else V_pf_status.hostid = *hostid; break; } case DIOCOSFPFLUSH: pf_osfp_flush(); break; case DIOCIGETIFACES: { struct pfioc_iface *io = (struct pfioc_iface *)addr; if (io->pfiio_esize != sizeof(struct pfi_kif)) { error = ENODEV; break; } error = pfi_get_ifaces(io->pfiio_name, io->pfiio_buffer, &io->pfiio_size); break; } case DIOCSETIFFLAG: { struct pfioc_iface *io = (struct pfioc_iface *)addr; error = pfi_set_flags(io->pfiio_name, io->pfiio_flags); break; } case DIOCCLRIFFLAG: { struct pfioc_iface *io = (struct pfioc_iface *)addr; error = pfi_clear_flags(io->pfiio_name, io->pfiio_flags); break; } default: error = ENODEV; break; } fail: PF_UNLOCK(); if (flags & FWRITE) sx_xunlock(&V_pf_consistency_lock); else sx_sunlock(&V_pf_consistency_lock); CURVNET_RESTORE(); return (error); } void pfsync_state_export(struct pfsync_state *sp, struct pf_state *st) { bzero(sp, sizeof(struct pfsync_state)); /* copy from state key */ sp->key[PF_SK_WIRE].addr[0] = st->key[PF_SK_WIRE]->addr[0]; sp->key[PF_SK_WIRE].addr[1] = st->key[PF_SK_WIRE]->addr[1]; sp->key[PF_SK_WIRE].port[0] = st->key[PF_SK_WIRE]->port[0]; sp->key[PF_SK_WIRE].port[1] = st->key[PF_SK_WIRE]->port[1]; sp->key[PF_SK_STACK].addr[0] = st->key[PF_SK_STACK]->addr[0]; sp->key[PF_SK_STACK].addr[1] = st->key[PF_SK_STACK]->addr[1]; sp->key[PF_SK_STACK].port[0] = st->key[PF_SK_STACK]->port[0]; sp->key[PF_SK_STACK].port[1] = st->key[PF_SK_STACK]->port[1]; sp->proto = st->key[PF_SK_WIRE]->proto; sp->af = st->key[PF_SK_WIRE]->af; /* copy from state */ strlcpy(sp->ifname, st->kif->pfik_name, sizeof(sp->ifname)); bcopy(&st->rt_addr, &sp->rt_addr, sizeof(sp->rt_addr)); sp->creation = htonl(time_second - st->creation); sp->expire = pf_state_expires(st); if (sp->expire <= time_second) sp->expire = htonl(0); else sp->expire = htonl(sp->expire - time_second); sp->direction = st->direction; sp->log = st->log; sp->timeout = st->timeout; sp->state_flags = st->state_flags; if (st->src_node) sp->sync_flags |= PFSYNC_FLAG_SRCNODE; if (st->nat_src_node) sp->sync_flags |= PFSYNC_FLAG_NATSRCNODE; bcopy(&st->id, &sp->id, sizeof(sp->id)); sp->creatorid = st->creatorid; pf_state_peer_hton(&st->src, &sp->src); pf_state_peer_hton(&st->dst, &sp->dst); if (st->rule.ptr == NULL) sp->rule = htonl(-1); else sp->rule = htonl(st->rule.ptr->nr); if (st->anchor.ptr == NULL) sp->anchor = htonl(-1); else sp->anchor = htonl(st->anchor.ptr->nr); if (st->nat_rule.ptr == NULL) sp->nat_rule = htonl(-1); else sp->nat_rule = htonl(st->nat_rule.ptr->nr); pf_state_counter_hton(st->packets[0], sp->packets[0]); pf_state_counter_hton(st->packets[1], sp->packets[1]); pf_state_counter_hton(st->bytes[0], sp->bytes[0]); pf_state_counter_hton(st->bytes[1], sp->bytes[1]); } /* * XXX - Check for version missmatch!!! */ static void pf_clear_states(void) { struct pf_state *state; PF_KEYS_LOCK(); PF_IDS_LOCK(); RB_FOREACH(state, pf_state_tree_id, &V_tree_id) { state->timeout = PFTM_PURGE; /* don't send out individual delete messages */ state->sync_state = PFSTATE_NOSYNC; pf_unlink_state(state, 1); } PF_IDS_UNLOCK(); PF_KEYS_UNLOCK(); #if 0 /* NPFSYNC */ /* * XXX This is called on module unload, we do not want to sync that over? */ */ pfsync_clear_states(V_pf_status.hostid, psk->psk_ifname); #endif } static int pf_clear_tables(void) { struct pfioc_table io; int error; bzero(&io, sizeof(io)); error = pfr_clr_tables(&io.pfrio_table, &io.pfrio_ndel, io.pfrio_flags); return (error); } static void pf_clear_srcnodes(void) { struct pf_src_node *n; struct pf_state *state; PF_IDS_LOCK(); RB_FOREACH(state, pf_state_tree_id, &V_tree_id) { state->src_node = NULL; state->nat_src_node = NULL; } PF_IDS_UNLOCK(); PF_KEYS_LOCK(); RB_FOREACH(n, pf_src_tree, &V_tree_src_tracking) { n->expire = 1; n->states = 0; } PF_KEYS_UNLOCK(); } /* * XXX - Check for version missmatch!!! */ /* * Duplicate pfctl -Fa operation to get rid of as much as we can. */ static int shutdown_pf(void) { int error = 0; u_int32_t t[5]; char nn = '\0'; V_pf_status.running = 0; do { if ((error = pf_begin_rules(&t[0], PF_RULESET_SCRUB, &nn)) != 0) { DPFPRINTF(PF_DEBUG_MISC, ("shutdown_pf: SCRUB\n")); break; } if ((error = pf_begin_rules(&t[1], PF_RULESET_FILTER, &nn)) != 0) { DPFPRINTF(PF_DEBUG_MISC, ("shutdown_pf: FILTER\n")); break; /* XXX: rollback? */ } if ((error = pf_begin_rules(&t[2], PF_RULESET_NAT, &nn)) != 0) { DPFPRINTF(PF_DEBUG_MISC, ("shutdown_pf: NAT\n")); break; /* XXX: rollback? */ } if ((error = pf_begin_rules(&t[3], PF_RULESET_BINAT, &nn)) != 0) { DPFPRINTF(PF_DEBUG_MISC, ("shutdown_pf: BINAT\n")); break; /* XXX: rollback? */ } if ((error = pf_begin_rules(&t[4], PF_RULESET_RDR, &nn)) != 0) { DPFPRINTF(PF_DEBUG_MISC, ("shutdown_pf: RDR\n")); break; /* XXX: rollback? */ } /* XXX: these should always succeed here */ pf_commit_rules(t[0], PF_RULESET_SCRUB, &nn); pf_commit_rules(t[1], PF_RULESET_FILTER, &nn); pf_commit_rules(t[2], PF_RULESET_NAT, &nn); pf_commit_rules(t[3], PF_RULESET_BINAT, &nn); pf_commit_rules(t[4], PF_RULESET_RDR, &nn); if ((error = pf_clear_tables()) != 0) break; #ifdef ALTQ if ((error = pf_begin_altq(&t[0])) != 0) { DPFPRINTF(PF_DEBUG_MISC, ("shutdown_pf: ALTQ\n")); break; } pf_commit_altq(t[0]); #endif pf_clear_states(); pf_clear_srcnodes(); /* status does not use malloced mem so no need to cleanup */ /* fingerprints and interfaces have thier own cleanup code */ } while(0); return (error); } #ifdef INET static int pf_check_in(void *arg, struct mbuf **m, struct ifnet *ifp, int dir, struct inpcb *inp) { /* * XXX Wed Jul 9 22:03:16 2003 UTC * OpenBSD has changed its byte ordering convention on ip_len/ip_off * in network stack. OpenBSD's network stack have converted * ip_len/ip_off to host byte order frist as FreeBSD. * Now this is not true anymore , so we should convert back to network * byte order. */ struct ip *h = NULL; int chk; if ((*m)->m_pkthdr.len >= (int)sizeof(struct ip)) { /* if m_pkthdr.len is less than ip header, pf will handle. */ h = mtod(*m, struct ip *); HTONS(h->ip_len); HTONS(h->ip_off); } CURVNET_SET(ifp->if_vnet); chk = pf_test(PF_IN, ifp, m, NULL, inp); CURVNET_RESTORE(); if (chk && *m) { m_freem(*m); *m = NULL; } if (*m != NULL) { /* pf_test can change ip header location */ h = mtod(*m, struct ip *); NTOHS(h->ip_len); NTOHS(h->ip_off); } return chk; } static int pf_check_out(void *arg, struct mbuf **m, struct ifnet *ifp, int dir, struct inpcb *inp) { /* * XXX Wed Jul 9 22:03:16 2003 UTC * OpenBSD has changed its byte ordering convention on ip_len/ip_off * in network stack. OpenBSD's network stack have converted * ip_len/ip_off to host byte order frist as FreeBSD. * Now this is not true anymore , so we should convert back to network * byte order. */ struct ip *h = NULL; int chk; /* We need a proper CSUM befor we start (s. OpenBSD ip_output) */ if ((*m)->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { in_delayed_cksum(*m); (*m)->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; } if ((*m)->m_pkthdr.len >= (int)sizeof(*h)) { /* if m_pkthdr.len is less than ip header, pf will handle. */ h = mtod(*m, struct ip *); HTONS(h->ip_len); HTONS(h->ip_off); } CURVNET_SET(ifp->if_vnet); chk = pf_test(PF_OUT, ifp, m, NULL, inp); CURVNET_RESTORE(); if (chk && *m) { m_freem(*m); *m = NULL; } if (*m != NULL) { /* pf_test can change ip header location */ h = mtod(*m, struct ip *); NTOHS(h->ip_len); NTOHS(h->ip_off); } return chk; } #endif #ifdef INET6 static int pf_check6_in(void *arg, struct mbuf **m, struct ifnet *ifp, int dir, struct inpcb *inp) { /* * IPv6 is not affected by ip_len/ip_off byte order changes. */ int chk; /* * In case of loopback traffic IPv6 uses the real interface in * order to support scoped addresses. In order to support stateful * filtering we have change this to lo0 as it is the case in IPv4. */ CURVNET_SET(ifp->if_vnet); chk = pf_test6(PF_IN, (*m)->m_flags & M_LOOP ? V_loif : ifp, m, NULL, inp); CURVNET_RESTORE(); if (chk && *m) { m_freem(*m); *m = NULL; } return chk; } static int pf_check6_out(void *arg, struct mbuf **m, struct ifnet *ifp, int dir, struct inpcb *inp) { /* * IPv6 does not affected ip_len/ip_off byte order changes. */ int chk; /* We need a proper CSUM before we start (s. OpenBSD ip_output) */ if ((*m)->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { #ifdef INET /* XXX-BZ copy&paste error from r126261? */ in_delayed_cksum(*m); #endif (*m)->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; } CURVNET_SET(ifp->if_vnet); chk = pf_test6(PF_OUT, ifp, m, NULL, inp); CURVNET_RESTORE(); if (chk && *m) { m_freem(*m); *m = NULL; } return chk; } #endif /* INET6 */ static int hook_pf(void) { #ifdef INET struct pfil_head *pfh_inet; #endif #ifdef INET6 struct pfil_head *pfh_inet6; #endif PF_UNLOCK_ASSERT(); if (V_pf_pfil_hooked) return (0); #ifdef INET pfh_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); if (pfh_inet == NULL) return (ESRCH); /* XXX */ pfil_add_hook(pf_check_in, NULL, PFIL_IN | PFIL_WAITOK, pfh_inet); pfil_add_hook(pf_check_out, NULL, PFIL_OUT | PFIL_WAITOK, pfh_inet); #endif #ifdef INET6 pfh_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); if (pfh_inet6 == NULL) { #ifdef INET pfil_remove_hook(pf_check_in, NULL, PFIL_IN | PFIL_WAITOK, pfh_inet); pfil_remove_hook(pf_check_out, NULL, PFIL_OUT | PFIL_WAITOK, pfh_inet); #endif return (ESRCH); /* XXX */ } pfil_add_hook(pf_check6_in, NULL, PFIL_IN | PFIL_WAITOK, pfh_inet6); pfil_add_hook(pf_check6_out, NULL, PFIL_OUT | PFIL_WAITOK, pfh_inet6); #endif V_pf_pfil_hooked = 1; return (0); } static int dehook_pf(void) { #ifdef INET struct pfil_head *pfh_inet; #endif #ifdef INET6 struct pfil_head *pfh_inet6; #endif PF_UNLOCK_ASSERT(); if (V_pf_pfil_hooked == 0) return (0); #ifdef INET pfh_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); if (pfh_inet == NULL) return (ESRCH); /* XXX */ pfil_remove_hook(pf_check_in, NULL, PFIL_IN | PFIL_WAITOK, pfh_inet); pfil_remove_hook(pf_check_out, NULL, PFIL_OUT | PFIL_WAITOK, pfh_inet); #endif #ifdef INET6 pfh_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); if (pfh_inet6 == NULL) return (ESRCH); /* XXX */ pfil_remove_hook(pf_check6_in, NULL, PFIL_IN | PFIL_WAITOK, pfh_inet6); pfil_remove_hook(pf_check6_out, NULL, PFIL_OUT | PFIL_WAITOK, pfh_inet6); #endif V_pf_pfil_hooked = 0; return (0); } /* * Must be called whenever any addressing information such as * address, port, protocol has changed. */ static void pf_pkt_addr_changed(struct mbuf *m) { struct pf_mtag *pf_tag; if ((pf_tag = pf_find_mtag(m)) != NULL) pf_tag->statekey = NULL; } static int pf_load(void) { int error; VNET_ITERATOR_DECL(vnet_iter); VNET_LIST_RLOCK(); VNET_FOREACH(vnet_iter) { CURVNET_SET(vnet_iter); V_pf_pfil_hooked = 0; V_pf_end_threads = 0; V_debug_pfugidhack = 0; TAILQ_INIT(&V_pf_tags); TAILQ_INIT(&V_pf_qids); CURVNET_RESTORE(); } VNET_LIST_RUNLOCK(); init_pf_mutex(); pf_dev = make_dev(&pf_cdevsw, 0, 0, 0, 0600, PF_NAME); if ((error = pfattach()) != 0) return (error); return (0); } static int pf_unload(void) { int error = 0; PF_LOCK(); V_pf_status.running = 0; PF_UNLOCK(); m_addr_chg_pf_p = NULL; error = dehook_pf(); if (error) { /* * Should not happen! * XXX Due to error code ESRCH, kldunload will show * a message like 'No such process'. */ printf("%s : pfil unregisteration fail\n", __FUNCTION__); return error; } PF_LOCK(); shutdown_pf(); V_pf_end_threads = 1; while (V_pf_end_threads < 2) { wakeup_one(pf_purge_thread); msleep(pf_purge_thread, &pf_mtx, 0, "pftmo", hz); } pf_normalize_cleanup(); pfi_cleanup(); pf_osfp_flush(); pf_osfp_cleanup(); cleanup_pf_zone(); PF_UNLOCK(); destroy_dev(pf_dev); destroy_pf_mutex(); return (error); } static int pf_modevent(module_t mod, int type, void *data) { int error = 0; switch(type) { case MOD_LOAD: error = pf_load(); break; case MOD_QUIESCE: /* * Module should not be unloaded due to race conditions. */ error = EPERM; break; case MOD_UNLOAD: error = pf_unload(); break; default: error = EINVAL; break; } return (error); } static moduledata_t pf_mod = { "pf", pf_modevent, 0 }; DECLARE_MODULE(pf, pf_mod, SI_SUB_PSEUDO, SI_ORDER_FIRST); MODULE_VERSION(pf, PF_MODVER);