pf.c revision 222529
197403Sobrien/* $OpenBSD: pf.c,v 1.527 2007/02/22 15:23:23 pyr Exp $ */ 297403Sobrien/* add: $OpenBSD: pf.c,v 1.559 2007/09/18 18:45:59 markus Exp $ */ 397403Sobrien 497403Sobrien/* 597403Sobrien * Copyright (c) 2001 Daniel Hartmeier 697403Sobrien * Copyright (c) 2002,2003 Henning Brauer 797403Sobrien * All rights reserved. 897403Sobrien * 997403Sobrien * Redistribution and use in source and binary forms, with or without 1097403Sobrien * modification, are permitted provided that the following conditions 1197403Sobrien * are met: 1297403Sobrien * 1397403Sobrien * - Redistributions of source code must retain the above copyright 1497403Sobrien * notice, this list of conditions and the following disclaimer. 1597403Sobrien * - Redistributions in binary form must reproduce the above 1697403Sobrien * copyright notice, this list of conditions and the following 1797403Sobrien * disclaimer in the documentation and/or other materials provided 1897403Sobrien * with the distribution. 1997403Sobrien * 2097403Sobrien * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 2197403Sobrien * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 2297403Sobrien * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 2397403Sobrien * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 2497403Sobrien * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 2597403Sobrien * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 2697403Sobrien * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 2797403Sobrien * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 2897403Sobrien * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2997403Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 3097403Sobrien * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 3197403Sobrien * POSSIBILITY OF SUCH DAMAGE. 3297403Sobrien * 3397403Sobrien * Effort sponsored in part by the Defense Advanced Research Projects 3497403Sobrien * Agency (DARPA) and Air Force Research Laboratory, Air Force 3597403Sobrien * Materiel Command, USAF, under agreement number F30602-01-2-0537. 3697403Sobrien * 3797403Sobrien */ 3897403Sobrien 3997403Sobrien#ifdef __FreeBSD__ 4097403Sobrien#include "opt_inet.h" 41110614Skan#include "opt_inet6.h" 42110614Skan 43110614Skan#include <sys/cdefs.h> 4497403Sobrien__FBSDID("$FreeBSD: head/sys/contrib/pf/net/pf.c 222529 2011-05-31 15:05:29Z bz $"); 45107606Sobrien#endif 46107606Sobrien 47107606Sobrien#ifdef __FreeBSD__ 48107606Sobrien#include "opt_bpf.h" 49107606Sobrien#include "opt_pf.h" 50107606Sobrien 51107606Sobrien#ifdef DEV_BPF 52107606Sobrien#define NBPFILTER DEV_BPF 53107606Sobrien#else 54107606Sobrien#define NBPFILTER 0 55107606Sobrien#endif 56107606Sobrien 57107606Sobrien#ifdef DEV_PFLOG 58107606Sobrien#define NPFLOG DEV_PFLOG 5997403Sobrien#else 6097403Sobrien#define NPFLOG 0 61107606Sobrien#endif 62107606Sobrien 6397403Sobrien#ifdef DEV_PFSYNC 6497403Sobrien#define NPFSYNC DEV_PFSYNC 6597403Sobrien#else 6697403Sobrien#define NPFSYNC 0 6797403Sobrien#endif 6897403Sobrien 6997403Sobrien#else 7097403Sobrien#include "bpfilter.h" 7197403Sobrien#include "pflog.h" 7297403Sobrien#include "pfsync.h" 7397403Sobrien#endif 7497403Sobrien 7597403Sobrien#include <sys/param.h> 7697403Sobrien#include <sys/systm.h> 7797403Sobrien#include <sys/mbuf.h> 7897403Sobrien#include <sys/filio.h> 7997403Sobrien#include <sys/socket.h> 8097403Sobrien#include <sys/socketvar.h> 8197403Sobrien#include <sys/kernel.h> 8297403Sobrien#include <sys/time.h> 8397403Sobrien#ifdef __FreeBSD__ 8497403Sobrien#include <sys/sysctl.h> 8597403Sobrien#include <sys/endian.h> 8697403Sobrien#else 8797403Sobrien#include <sys/pool.h> 8897403Sobrien#endif 8997403Sobrien#include <sys/proc.h> 9097403Sobrien#ifdef __FreeBSD__ 9197403Sobrien#include <sys/kthread.h> 9297403Sobrien#include <sys/lock.h> 9397403Sobrien#include <sys/sx.h> 9497403Sobrien#else 9597403Sobrien#include <sys/rwlock.h> 9697403Sobrien#endif 9797403Sobrien 9897403Sobrien#include <net/if.h> 9997403Sobrien#include <net/if_types.h> 10097403Sobrien#include <net/bpf.h> 10197403Sobrien#include <net/route.h> 10297403Sobrien#ifndef __FreeBSD__ 10397403Sobrien#include <net/radix_mpath.h> 10497403Sobrien#endif 10597403Sobrien 10697403Sobrien#include <netinet/in.h> 10797403Sobrien#include <netinet/in_var.h> 10897403Sobrien#include <netinet/in_systm.h> 10997403Sobrien#include <netinet/ip.h> 11097403Sobrien#include <netinet/ip_var.h> 11197403Sobrien#include <netinet/tcp.h> 11297403Sobrien#include <netinet/tcp_seq.h> 11397403Sobrien#include <netinet/udp.h> 11497403Sobrien#include <netinet/ip_icmp.h> 11597403Sobrien#include <netinet/in_pcb.h> 11697403Sobrien#include <netinet/tcp_timer.h> 11797403Sobrien#include <netinet/tcp_var.h> 11897403Sobrien#include <netinet/udp_var.h> 11997403Sobrien#include <netinet/icmp_var.h> 12097403Sobrien#include <netinet/if_ether.h> 12197403Sobrien 12297403Sobrien#ifndef __FreeBSD__ 12397403Sobrien#include <dev/rndvar.h> 12497403Sobrien#endif 12597403Sobrien#include <net/pfvar.h> 12697403Sobrien#include <net/if_pflog.h> 12797403Sobrien 12897403Sobrien#if NPFSYNC > 0 12997403Sobrien#include <net/if_pfsync.h> 13097403Sobrien#endif /* NPFSYNC > 0 */ 13197403Sobrien 13297403Sobrien#ifdef INET6 13397403Sobrien#include <netinet/ip6.h> 13497403Sobrien#include <netinet/in_pcb.h> 13597403Sobrien#include <netinet/icmp6.h> 13697403Sobrien#include <netinet6/nd6.h> 13797403Sobrien#ifdef __FreeBSD__ 13897403Sobrien#include <netinet6/ip6_var.h> 13997403Sobrien#include <netinet6/in6_pcb.h> 14097403Sobrien#endif 14197403Sobrien#endif /* INET6 */ 14297403Sobrien 14397403Sobrien#ifdef __FreeBSD__ 14497403Sobrien#include <machine/in_cksum.h> 14597403Sobrien#include <sys/limits.h> 14697403Sobrien#include <sys/ucred.h> 14797403Sobrien#include <security/mac/mac_framework.h> 14897403Sobrien 14997403Sobrienextern int ip_optcopy(struct ip *, struct ip *); 15097403Sobrienextern int debug_pfugidhack; 15197403Sobrien#endif 15297403Sobrien 15397403Sobrien#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x 15497403Sobrien 15597403Sobrien/* 15697403Sobrien * Global variables 15797403Sobrien */ 15897403Sobrien 15997403Sobrienstruct pf_altqqueue pf_altqs[2]; 16097403Sobrienstruct pf_palist pf_pabuf; 16197403Sobrienstruct pf_altqqueue *pf_altqs_active; 16297403Sobrienstruct pf_altqqueue *pf_altqs_inactive; 163110614Skanstruct pf_status pf_status; 164110614Skan 165110614Skanu_int32_t ticket_altqs_active; 166110614Skanu_int32_t ticket_altqs_inactive; 167110614Skanint altqs_inactive_open; 16897403Sobrienu_int32_t ticket_pabuf; 16997403Sobrien 17097403Sobrienstruct pf_anchor_stackframe { 17197403Sobrien struct pf_ruleset *rs; 17297403Sobrien struct pf_rule *r; 17397403Sobrien struct pf_anchor_node *parent; 17497403Sobrien struct pf_anchor *child; 17597403Sobrien} pf_anchor_stack[64]; 17697403Sobrien 17797403Sobrien#ifdef __FreeBSD__ 17897403Sobrienuma_zone_t pf_src_tree_pl, pf_rule_pl; 17997403Sobrienuma_zone_t pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 18097403Sobrien#else 18197403Sobrienstruct pool pf_src_tree_pl, pf_rule_pl; 18297403Sobrienstruct pool pf_state_pl, pf_altq_pl, pf_pooladdr_pl; 18397403Sobrien#endif 18497403Sobrien 18597403Sobrienvoid pf_print_host(struct pf_addr *, u_int16_t, u_int8_t); 18697403Sobrien 18797403Sobrienvoid pf_init_threshold(struct pf_threshold *, u_int32_t, 18897403Sobrien u_int32_t); 18997403Sobrienvoid pf_add_threshold(struct pf_threshold *); 19097403Sobrienint pf_check_threshold(struct pf_threshold *); 19197403Sobrien 19297403Sobrienvoid pf_change_ap(struct pf_addr *, u_int16_t *, 19397403Sobrien u_int16_t *, u_int16_t *, struct pf_addr *, 19497403Sobrien u_int16_t, u_int8_t, sa_family_t); 19597403Sobrienint pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *, 19697403Sobrien struct tcphdr *, struct pf_state_peer *); 19797403Sobrien#ifdef INET6 19897403Sobrienvoid pf_change_a6(struct pf_addr *, u_int16_t *, 19997403Sobrien struct pf_addr *, u_int8_t); 20097403Sobrien#endif /* INET6 */ 20197403Sobrienvoid pf_change_icmp(struct pf_addr *, u_int16_t *, 20297403Sobrien struct pf_addr *, struct pf_addr *, u_int16_t, 20397403Sobrien u_int16_t *, u_int16_t *, u_int16_t *, 20497403Sobrien u_int16_t *, u_int8_t, sa_family_t); 20597403Sobrien#ifdef __FreeBSD__ 20697403Sobrienvoid pf_send_tcp(struct mbuf *, 20797403Sobrien const struct pf_rule *, sa_family_t, 20897403Sobrien#else 20997403Sobrienvoid pf_send_tcp(const struct pf_rule *, sa_family_t, 21097403Sobrien#endif 21197403Sobrien const struct pf_addr *, const struct pf_addr *, 21297403Sobrien u_int16_t, u_int16_t, u_int32_t, u_int32_t, 21397403Sobrien u_int8_t, u_int16_t, u_int16_t, u_int8_t, int, 21497403Sobrien u_int16_t, struct ether_header *, struct ifnet *); 21597403Sobrienvoid pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t, 21697403Sobrien sa_family_t, struct pf_rule *); 21797403Sobrienstruct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *, 21897403Sobrien int, int, struct pfi_kif *, 21997403Sobrien struct pf_addr *, u_int16_t, struct pf_addr *, 22097403Sobrien u_int16_t, int); 22197403Sobrienstruct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *, 22297403Sobrien int, int, struct pfi_kif *, struct pf_src_node **, 22397403Sobrien struct pf_addr *, u_int16_t, 22497403Sobrien struct pf_addr *, u_int16_t, 22597403Sobrien struct pf_addr *, u_int16_t *); 22697403Sobrienint pf_test_tcp(struct pf_rule **, struct pf_state **, 22797403Sobrien int, struct pfi_kif *, struct mbuf *, int, 22897403Sobrien void *, struct pf_pdesc *, struct pf_rule **, 22997403Sobrien#ifdef __FreeBSD__ 23097403Sobrien struct pf_ruleset **, struct ifqueue *, 23197403Sobrien struct inpcb *); 23297403Sobrien#else 23397403Sobrien struct pf_ruleset **, struct ifqueue *); 23497403Sobrien#endif 23597403Sobrienint pf_test_udp(struct pf_rule **, struct pf_state **, 23697403Sobrien int, struct pfi_kif *, struct mbuf *, int, 23797403Sobrien void *, struct pf_pdesc *, struct pf_rule **, 23897403Sobrien#ifdef __FreeBSD__ 23997403Sobrien struct pf_ruleset **, struct ifqueue *, 24097403Sobrien struct inpcb *); 24197403Sobrien#else 24297403Sobrien struct pf_ruleset **, struct ifqueue *); 24397403Sobrien#endif 24497403Sobrienint pf_test_icmp(struct pf_rule **, struct pf_state **, 24597403Sobrien int, struct pfi_kif *, struct mbuf *, int, 24697403Sobrien void *, struct pf_pdesc *, struct pf_rule **, 24797403Sobrien struct pf_ruleset **, struct ifqueue *); 24897403Sobrienint pf_test_other(struct pf_rule **, struct pf_state **, 24997403Sobrien int, struct pfi_kif *, struct mbuf *, int, void *, 25097403Sobrien struct pf_pdesc *, struct pf_rule **, 25197403Sobrien struct pf_ruleset **, struct ifqueue *); 25297403Sobrienint pf_test_fragment(struct pf_rule **, int, 25397403Sobrien struct pfi_kif *, struct mbuf *, void *, 25497403Sobrien struct pf_pdesc *, struct pf_rule **, 25597403Sobrien struct pf_ruleset **); 25697403Sobrienint pf_tcp_track_full(struct pf_state_peer *, 25797403Sobrien struct pf_state_peer *, struct pf_state **, 25897403Sobrien struct pfi_kif *, struct mbuf *, int, 25997403Sobrien struct pf_pdesc *, u_short *, int *); 26097403Sobrienint pf_tcp_track_sloppy(struct pf_state_peer *, 26197403Sobrien struct pf_state_peer *, struct pf_state **, 26297403Sobrien struct pf_pdesc *, u_short *); 26397403Sobrienint pf_test_state_tcp(struct pf_state **, int, 26497403Sobrien struct pfi_kif *, struct mbuf *, int, 26597403Sobrien void *, struct pf_pdesc *, u_short *); 26697403Sobrienint pf_test_state_udp(struct pf_state **, int, 26797403Sobrien struct pfi_kif *, struct mbuf *, int, 26897403Sobrien void *, struct pf_pdesc *); 26997403Sobrienint pf_test_state_icmp(struct pf_state **, int, 27097403Sobrien struct pfi_kif *, struct mbuf *, int, 27197403Sobrien void *, struct pf_pdesc *, u_short *); 27297403Sobrienint pf_test_state_other(struct pf_state **, int, 27397403Sobrien struct pfi_kif *, struct pf_pdesc *); 27497403Sobrienint pf_match_tag(struct mbuf *, struct pf_rule *, 27597403Sobrien struct pf_mtag *, int *); 27697403Sobrienint pf_step_out_of_anchor(int *, struct pf_ruleset **, 27797403Sobrien int, struct pf_rule **, struct pf_rule **, 27897403Sobrien int *); 27997403Sobrienvoid pf_hash(struct pf_addr *, struct pf_addr *, 28097403Sobrien struct pf_poolhashkey *, sa_family_t); 28197403Sobrienint pf_map_addr(u_int8_t, struct pf_rule *, 28297403Sobrien struct pf_addr *, struct pf_addr *, 28397403Sobrien struct pf_addr *, struct pf_src_node **); 28497403Sobrienint pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *, 28597403Sobrien struct pf_addr *, struct pf_addr *, u_int16_t, 28697403Sobrien struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t, 28797403Sobrien struct pf_src_node **); 28897403Sobrienvoid pf_route(struct mbuf **, struct pf_rule *, int, 28997403Sobrien struct ifnet *, struct pf_state *, 29097403Sobrien struct pf_pdesc *); 29197403Sobrienvoid pf_route6(struct mbuf **, struct pf_rule *, int, 29297403Sobrien struct ifnet *, struct pf_state *, 29397403Sobrien struct pf_pdesc *); 29497403Sobrien#ifdef __FreeBSD__ 29597403Sobrien/* XXX: import */ 29697403Sobrien#else 29797403Sobrienint pf_socket_lookup(int, struct pf_pdesc *); 29897403Sobrien#endif 29997403Sobrienu_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t, 30097403Sobrien sa_family_t); 30197403Sobrienu_int16_t pf_get_mss(struct mbuf *, int, u_int16_t, 30297403Sobrien sa_family_t); 30397403Sobrienu_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, 30497403Sobrien u_int16_t); 30597403Sobrienvoid pf_set_rt_ifp(struct pf_state *, 30697403Sobrien struct pf_addr *); 30797403Sobrienint pf_check_proto_cksum(struct mbuf *, int, int, 30897403Sobrien u_int8_t, sa_family_t); 30997403Sobrienint pf_addr_wrap_neq(struct pf_addr_wrap *, 31097403Sobrien struct pf_addr_wrap *); 31197403Sobrienstruct pf_state *pf_find_state_recurse(struct pfi_kif *, 31297403Sobrien struct pf_state_cmp *, u_int8_t); 31397403Sobrienint pf_src_connlimit(struct pf_state **); 31497403Sobrienint pf_check_congestion(struct ifqueue *); 31597403Sobrien 31697403Sobrien#ifdef __FreeBSD__ 31797403Sobrienint in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len); 31897403Sobrien 31997403Sobrienextern int pf_end_threads; 32097403Sobrien 32197403Sobrienstruct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX]; 32297403Sobrien#else 32397403Sobrienextern struct pool pfr_ktable_pl; 32497403Sobrienextern struct pool pfr_kentry_pl; 32597403Sobrien 32697403Sobrienstruct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = { 32797403Sobrien { &pf_state_pl, PFSTATE_HIWAT }, 32897403Sobrien { &pf_src_tree_pl, PFSNODE_HIWAT }, 32997403Sobrien { &pf_frent_pl, PFFRAG_FRENT_HIWAT }, 33097403Sobrien { &pfr_ktable_pl, PFR_KTABLE_HIWAT }, 33197403Sobrien { &pfr_kentry_pl, PFR_KENTRY_HIWAT } 33297403Sobrien}; 33397403Sobrien#endif 33497403Sobrien 33597403Sobrien#define STATE_LOOKUP() \ 33697403Sobrien do { \ 33797403Sobrien if (direction == PF_IN) \ 33897403Sobrien *state = pf_find_state_recurse( \ 33997403Sobrien kif, &key, PF_EXT_GWY); \ 34097403Sobrien else \ 34197403Sobrien *state = pf_find_state_recurse( \ 34297403Sobrien kif, &key, PF_LAN_EXT); \ 34397403Sobrien if (*state == NULL || (*state)->timeout == PFTM_PURGE) \ 34497403Sobrien return (PF_DROP); \ 34597403Sobrien if (direction == PF_OUT && \ 34697403Sobrien (((*state)->rule.ptr->rt == PF_ROUTETO && \ 34797403Sobrien (*state)->rule.ptr->direction == PF_OUT) || \ 34897403Sobrien ((*state)->rule.ptr->rt == PF_REPLYTO && \ 34997403Sobrien (*state)->rule.ptr->direction == PF_IN)) && \ 35097403Sobrien (*state)->rt_kif != NULL && \ 35197403Sobrien (*state)->rt_kif != kif) \ 35297403Sobrien return (PF_PASS); \ 35397403Sobrien } while (0) 35497403Sobrien 35597403Sobrien#define STATE_TRANSLATE(s) \ 35697403Sobrien (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \ 35797403Sobrien ((s)->af == AF_INET6 && \ 35897403Sobrien ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \ 35997403Sobrien (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \ 36097403Sobrien (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \ 36197403Sobrien (s)->lan.port != (s)->gwy.port 36297403Sobrien 36397403Sobrien#define BOUND_IFACE(r, k) \ 36497403Sobrien ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all 36597403Sobrien 36697403Sobrien#define STATE_INC_COUNTERS(s) \ 36797403Sobrien do { \ 36897403Sobrien s->rule.ptr->states++; \ 36997403Sobrien if (s->anchor.ptr != NULL) \ 37097403Sobrien s->anchor.ptr->states++; \ 37197403Sobrien if (s->nat_rule.ptr != NULL) \ 37297403Sobrien s->nat_rule.ptr->states++; \ 373 } while (0) 374 375#define STATE_DEC_COUNTERS(s) \ 376 do { \ 377 if (s->nat_rule.ptr != NULL) \ 378 s->nat_rule.ptr->states--; \ 379 if (s->anchor.ptr != NULL) \ 380 s->anchor.ptr->states--; \ 381 s->rule.ptr->states--; \ 382 } while (0) 383 384struct pf_src_tree tree_src_tracking; 385 386struct pf_state_tree_id tree_id; 387struct pf_state_queue state_list; 388 389#ifdef __FreeBSD__ 390static int pf_src_compare(struct pf_src_node *, struct pf_src_node *); 391static int pf_state_compare_lan_ext(struct pf_state *, struct pf_state *); 392static int pf_state_compare_ext_gwy(struct pf_state *, struct pf_state *); 393static int pf_state_compare_id(struct pf_state *, struct pf_state *); 394#endif 395 396RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare); 397RB_GENERATE(pf_state_tree_lan_ext, pf_state, 398 u.s.entry_lan_ext, pf_state_compare_lan_ext); 399RB_GENERATE(pf_state_tree_ext_gwy, pf_state, 400 u.s.entry_ext_gwy, pf_state_compare_ext_gwy); 401RB_GENERATE(pf_state_tree_id, pf_state, 402 u.s.entry_id, pf_state_compare_id); 403 404#ifdef __FreeBSD__ 405static int 406#else 407static __inline int 408#endif 409pf_src_compare(struct pf_src_node *a, struct pf_src_node *b) 410{ 411 int diff; 412 413 if (a->rule.ptr > b->rule.ptr) 414 return (1); 415 if (a->rule.ptr < b->rule.ptr) 416 return (-1); 417 if ((diff = a->af - b->af) != 0) 418 return (diff); 419 switch (a->af) { 420#ifdef INET 421 case AF_INET: 422 if (a->addr.addr32[0] > b->addr.addr32[0]) 423 return (1); 424 if (a->addr.addr32[0] < b->addr.addr32[0]) 425 return (-1); 426 break; 427#endif /* INET */ 428#ifdef INET6 429 case AF_INET6: 430 if (a->addr.addr32[3] > b->addr.addr32[3]) 431 return (1); 432 if (a->addr.addr32[3] < b->addr.addr32[3]) 433 return (-1); 434 if (a->addr.addr32[2] > b->addr.addr32[2]) 435 return (1); 436 if (a->addr.addr32[2] < b->addr.addr32[2]) 437 return (-1); 438 if (a->addr.addr32[1] > b->addr.addr32[1]) 439 return (1); 440 if (a->addr.addr32[1] < b->addr.addr32[1]) 441 return (-1); 442 if (a->addr.addr32[0] > b->addr.addr32[0]) 443 return (1); 444 if (a->addr.addr32[0] < b->addr.addr32[0]) 445 return (-1); 446 break; 447#endif /* INET6 */ 448 } 449 return (0); 450} 451 452#ifdef __FreeBSD__ 453static int 454#else 455static __inline int 456#endif 457pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b) 458{ 459 int diff; 460 461 if ((diff = a->proto - b->proto) != 0) 462 return (diff); 463 if ((diff = a->af - b->af) != 0) 464 return (diff); 465 switch (a->af) { 466#ifdef INET 467 case AF_INET: 468 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 469 return (1); 470 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 471 return (-1); 472 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 473 return (1); 474 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 475 return (-1); 476 break; 477#endif /* INET */ 478#ifdef INET6 479 case AF_INET6: 480 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3]) 481 return (1); 482 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3]) 483 return (-1); 484 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 485 return (1); 486 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 487 return (-1); 488 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2]) 489 return (1); 490 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2]) 491 return (-1); 492 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 493 return (1); 494 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 495 return (-1); 496 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1]) 497 return (1); 498 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1]) 499 return (-1); 500 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 501 return (1); 502 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 503 return (-1); 504 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0]) 505 return (1); 506 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0]) 507 return (-1); 508 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 509 return (1); 510 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 511 return (-1); 512 break; 513#endif /* INET6 */ 514 } 515 516 if ((diff = a->lan.port - b->lan.port) != 0) 517 return (diff); 518 if ((diff = a->ext.port - b->ext.port) != 0) 519 return (diff); 520 521 return (0); 522} 523 524#ifdef __FreeBSD__ 525static int 526#else 527static __inline int 528#endif 529pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b) 530{ 531 int diff; 532 533 if ((diff = a->proto - b->proto) != 0) 534 return (diff); 535 if ((diff = a->af - b->af) != 0) 536 return (diff); 537 switch (a->af) { 538#ifdef INET 539 case AF_INET: 540 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 541 return (1); 542 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 543 return (-1); 544 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 545 return (1); 546 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 547 return (-1); 548 break; 549#endif /* INET */ 550#ifdef INET6 551 case AF_INET6: 552 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3]) 553 return (1); 554 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3]) 555 return (-1); 556 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3]) 557 return (1); 558 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3]) 559 return (-1); 560 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2]) 561 return (1); 562 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2]) 563 return (-1); 564 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2]) 565 return (1); 566 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2]) 567 return (-1); 568 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1]) 569 return (1); 570 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1]) 571 return (-1); 572 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1]) 573 return (1); 574 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1]) 575 return (-1); 576 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0]) 577 return (1); 578 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0]) 579 return (-1); 580 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0]) 581 return (1); 582 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0]) 583 return (-1); 584 break; 585#endif /* INET6 */ 586 } 587 588 if ((diff = a->ext.port - b->ext.port) != 0) 589 return (diff); 590 if ((diff = a->gwy.port - b->gwy.port) != 0) 591 return (diff); 592 593 return (0); 594} 595 596#ifdef __FreeBSD__ 597static int 598#else 599static __inline int 600#endif 601pf_state_compare_id(struct pf_state *a, struct pf_state *b) 602{ 603 if (a->id > b->id) 604 return (1); 605 if (a->id < b->id) 606 return (-1); 607 if (a->creatorid > b->creatorid) 608 return (1); 609 if (a->creatorid < b->creatorid) 610 return (-1); 611 612 return (0); 613} 614 615#ifdef INET6 616void 617pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af) 618{ 619 switch (af) { 620#ifdef INET 621 case AF_INET: 622 dst->addr32[0] = src->addr32[0]; 623 break; 624#endif /* INET */ 625 case AF_INET6: 626 dst->addr32[0] = src->addr32[0]; 627 dst->addr32[1] = src->addr32[1]; 628 dst->addr32[2] = src->addr32[2]; 629 dst->addr32[3] = src->addr32[3]; 630 break; 631 } 632} 633#endif /* INET6 */ 634 635struct pf_state * 636pf_find_state_byid(struct pf_state_cmp *key) 637{ 638 pf_status.fcounters[FCNT_STATE_SEARCH]++; 639 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key)); 640} 641 642struct pf_state * 643pf_find_state_recurse(struct pfi_kif *kif, struct pf_state_cmp *key, u_int8_t tree) 644{ 645 struct pf_state *s; 646 647 pf_status.fcounters[FCNT_STATE_SEARCH]++; 648 649 switch (tree) { 650 case PF_LAN_EXT: 651 if ((s = RB_FIND(pf_state_tree_lan_ext, &kif->pfik_lan_ext, 652 (struct pf_state *)key)) != NULL) 653 return (s); 654 if ((s = RB_FIND(pf_state_tree_lan_ext, &pfi_all->pfik_lan_ext, 655 (struct pf_state *)key)) != NULL) 656 return (s); 657 return (NULL); 658 case PF_EXT_GWY: 659 if ((s = RB_FIND(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, 660 (struct pf_state *)key)) != NULL) 661 return (s); 662 if ((s = RB_FIND(pf_state_tree_ext_gwy, &pfi_all->pfik_ext_gwy, 663 (struct pf_state *)key)) != NULL) 664 return (s); 665 return (NULL); 666 default: 667 panic("pf_find_state_recurse"); 668 } 669} 670 671struct pf_state * 672pf_find_state_all(struct pf_state_cmp *key, u_int8_t tree, int *more) 673{ 674 struct pf_state *s, *ss = NULL; 675 struct pfi_kif *kif; 676 677 pf_status.fcounters[FCNT_STATE_SEARCH]++; 678 679 switch (tree) { 680 case PF_LAN_EXT: 681 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 682 s = RB_FIND(pf_state_tree_lan_ext, 683 &kif->pfik_lan_ext, (struct pf_state *)key); 684 if (s == NULL) 685 continue; 686 if (more == NULL) 687 return (s); 688 ss = s; 689 (*more)++; 690 } 691 return (ss); 692 case PF_EXT_GWY: 693 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) { 694 s = RB_FIND(pf_state_tree_ext_gwy, 695 &kif->pfik_ext_gwy, (struct pf_state *)key); 696 if (s == NULL) 697 continue; 698 if (more == NULL) 699 return (s); 700 ss = s; 701 (*more)++; 702 } 703 return (ss); 704 default: 705 panic("pf_find_state_all"); 706 } 707} 708 709void 710pf_init_threshold(struct pf_threshold *threshold, 711 u_int32_t limit, u_int32_t seconds) 712{ 713 threshold->limit = limit * PF_THRESHOLD_MULT; 714 threshold->seconds = seconds; 715 threshold->count = 0; 716 threshold->last = time_second; 717} 718 719void 720pf_add_threshold(struct pf_threshold *threshold) 721{ 722 u_int32_t t = time_second, diff = t - threshold->last; 723 724 if (diff >= threshold->seconds) 725 threshold->count = 0; 726 else 727 threshold->count -= threshold->count * diff / 728 threshold->seconds; 729 threshold->count += PF_THRESHOLD_MULT; 730 threshold->last = t; 731} 732 733int 734pf_check_threshold(struct pf_threshold *threshold) 735{ 736 return (threshold->count > threshold->limit); 737} 738 739int 740pf_src_connlimit(struct pf_state **state) 741{ 742 struct pf_state *s; 743 int bad = 0; 744 745 (*state)->src_node->conn++; 746 (*state)->src.tcp_est = 1; 747 pf_add_threshold(&(*state)->src_node->conn_rate); 748 749 if ((*state)->rule.ptr->max_src_conn && 750 (*state)->rule.ptr->max_src_conn < 751 (*state)->src_node->conn) { 752 pf_status.lcounters[LCNT_SRCCONN]++; 753 bad++; 754 } 755 756 if ((*state)->rule.ptr->max_src_conn_rate.limit && 757 pf_check_threshold(&(*state)->src_node->conn_rate)) { 758 pf_status.lcounters[LCNT_SRCCONNRATE]++; 759 bad++; 760 } 761 762 if (!bad) 763 return (0); 764 765 if ((*state)->rule.ptr->overload_tbl) { 766 struct pfr_addr p; 767 u_int32_t killed = 0; 768 769 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++; 770 if (pf_status.debug >= PF_DEBUG_MISC) { 771 printf("pf_src_connlimit: blocking address "); 772 pf_print_host(&(*state)->src_node->addr, 0, 773 (*state)->af); 774 } 775 776 bzero(&p, sizeof(p)); 777 p.pfra_af = (*state)->af; 778 switch ((*state)->af) { 779#ifdef INET 780 case AF_INET: 781 p.pfra_net = 32; 782 p.pfra_ip4addr = (*state)->src_node->addr.v4; 783 break; 784#endif /* INET */ 785#ifdef INET6 786 case AF_INET6: 787 p.pfra_net = 128; 788 p.pfra_ip6addr = (*state)->src_node->addr.v6; 789 break; 790#endif /* INET6 */ 791 } 792 793 pfr_insert_kentry((*state)->rule.ptr->overload_tbl, 794 &p, time_second); 795 796 /* kill existing states if that's required. */ 797 if ((*state)->rule.ptr->flush) { 798 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++; 799 800 RB_FOREACH(s, pf_state_tree_id, &tree_id) { 801 /* 802 * Kill states from this source. (Only those 803 * from the same rule if PF_FLUSH_GLOBAL is not 804 * set) 805 */ 806 if (s->af == (*state)->af && 807 (((*state)->direction == PF_OUT && 808 PF_AEQ(&(*state)->src_node->addr, 809 &s->lan.addr, s->af)) || 810 ((*state)->direction == PF_IN && 811 PF_AEQ(&(*state)->src_node->addr, 812 &s->ext.addr, s->af))) && 813 ((*state)->rule.ptr->flush & 814 PF_FLUSH_GLOBAL || 815 (*state)->rule.ptr == s->rule.ptr)) { 816 s->timeout = PFTM_PURGE; 817 s->src.state = s->dst.state = 818 TCPS_CLOSED; 819 killed++; 820 } 821 } 822 if (pf_status.debug >= PF_DEBUG_MISC) 823 printf(", %u states killed", killed); 824 } 825 if (pf_status.debug >= PF_DEBUG_MISC) 826 printf("\n"); 827 } 828 829 /* kill this state */ 830 (*state)->timeout = PFTM_PURGE; 831 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 832 return (1); 833} 834 835int 836pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule, 837 struct pf_addr *src, sa_family_t af) 838{ 839 struct pf_src_node k; 840 841 if (*sn == NULL) { 842 k.af = af; 843 PF_ACPY(&k.addr, src, af); 844 if (rule->rule_flag & PFRULE_RULESRCTRACK || 845 rule->rpool.opts & PF_POOL_STICKYADDR) 846 k.rule.ptr = rule; 847 else 848 k.rule.ptr = NULL; 849 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 850 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 851 } 852 if (*sn == NULL) { 853 if (!rule->max_src_nodes || 854 rule->src_nodes < rule->max_src_nodes) 855 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT); 856 else 857 pf_status.lcounters[LCNT_SRCNODES]++; 858 if ((*sn) == NULL) 859 return (-1); 860 bzero(*sn, sizeof(struct pf_src_node)); 861 862 pf_init_threshold(&(*sn)->conn_rate, 863 rule->max_src_conn_rate.limit, 864 rule->max_src_conn_rate.seconds); 865 866 (*sn)->af = af; 867 if (rule->rule_flag & PFRULE_RULESRCTRACK || 868 rule->rpool.opts & PF_POOL_STICKYADDR) 869 (*sn)->rule.ptr = rule; 870 else 871 (*sn)->rule.ptr = NULL; 872 PF_ACPY(&(*sn)->addr, src, af); 873 if (RB_INSERT(pf_src_tree, 874 &tree_src_tracking, *sn) != NULL) { 875 if (pf_status.debug >= PF_DEBUG_MISC) { 876 printf("pf: src_tree insert failed: "); 877 pf_print_host(&(*sn)->addr, 0, af); 878 printf("\n"); 879 } 880 pool_put(&pf_src_tree_pl, *sn); 881 return (-1); 882 } 883 (*sn)->creation = time_second; 884 (*sn)->ruletype = rule->action; 885 if ((*sn)->rule.ptr != NULL) 886 (*sn)->rule.ptr->src_nodes++; 887 pf_status.scounters[SCNT_SRC_NODE_INSERT]++; 888 pf_status.src_nodes++; 889 } else { 890 if (rule->max_src_states && 891 (*sn)->states >= rule->max_src_states) { 892 pf_status.lcounters[LCNT_SRCSTATES]++; 893 return (-1); 894 } 895 } 896 return (0); 897} 898 899int 900pf_insert_state(struct pfi_kif *kif, struct pf_state *state) 901{ 902 /* Thou MUST NOT insert multiple duplicate keys */ 903 state->u.s.kif = kif; 904 if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) { 905 if (pf_status.debug >= PF_DEBUG_MISC) { 906 printf("pf: state insert failed: tree_lan_ext"); 907 printf(" lan: "); 908 pf_print_host(&state->lan.addr, state->lan.port, 909 state->af); 910 printf(" gwy: "); 911 pf_print_host(&state->gwy.addr, state->gwy.port, 912 state->af); 913 printf(" ext: "); 914 pf_print_host(&state->ext.addr, state->ext.port, 915 state->af); 916 if (state->sync_flags & PFSTATE_FROMSYNC) 917 printf(" (from sync)"); 918 printf("\n"); 919 } 920 return (-1); 921 } 922 923 if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) { 924 if (pf_status.debug >= PF_DEBUG_MISC) { 925 printf("pf: state insert failed: tree_ext_gwy"); 926 printf(" lan: "); 927 pf_print_host(&state->lan.addr, state->lan.port, 928 state->af); 929 printf(" gwy: "); 930 pf_print_host(&state->gwy.addr, state->gwy.port, 931 state->af); 932 printf(" ext: "); 933 pf_print_host(&state->ext.addr, state->ext.port, 934 state->af); 935 if (state->sync_flags & PFSTATE_FROMSYNC) 936 printf(" (from sync)"); 937 printf("\n"); 938 } 939 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 940 return (-1); 941 } 942 943 if (state->id == 0 && state->creatorid == 0) { 944 state->id = htobe64(pf_status.stateid++); 945 state->creatorid = pf_status.hostid; 946 } 947 if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) { 948 if (pf_status.debug >= PF_DEBUG_MISC) { 949#ifdef __FreeBSD__ 950 printf("pf: state insert failed: " 951 "id: %016llx creatorid: %08x", 952 (long long)be64toh(state->id), 953 ntohl(state->creatorid)); 954#else 955 printf("pf: state insert failed: " 956 "id: %016llx creatorid: %08x", 957 betoh64(state->id), ntohl(state->creatorid)); 958#endif 959 if (state->sync_flags & PFSTATE_FROMSYNC) 960 printf(" (from sync)"); 961 printf("\n"); 962 } 963 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state); 964 RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state); 965 return (-1); 966 } 967 TAILQ_INSERT_TAIL(&state_list, state, u.s.entry_list); 968 pf_status.fcounters[FCNT_STATE_INSERT]++; 969 pf_status.states++; 970 pfi_kif_ref(kif, PFI_KIF_REF_STATE); 971#if NPFSYNC 972 pfsync_insert_state(state); 973#endif 974 return (0); 975} 976 977void 978pf_purge_thread(void *v) 979{ 980 int nloops = 0, s; 981#ifdef __FreeBSD__ 982 int locked; 983#endif 984 985 for (;;) { 986 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz); 987 988#ifdef __FreeBSD__ 989 sx_slock(&pf_consistency_lock); 990 PF_LOCK(); 991 locked = 0; 992 993 if (pf_end_threads) { 994 PF_UNLOCK(); 995 sx_sunlock(&pf_consistency_lock); 996 sx_xlock(&pf_consistency_lock); 997 PF_LOCK(); 998 pf_purge_expired_states(pf_status.states, 1); 999 pf_purge_expired_fragments(); 1000 pf_purge_expired_src_nodes(1); 1001 pf_end_threads++; 1002 1003 sx_xunlock(&pf_consistency_lock); 1004 PF_UNLOCK(); 1005 wakeup(pf_purge_thread); 1006 kproc_exit(0); 1007 } 1008#endif 1009 s = splsoftnet(); 1010 1011 /* process a fraction of the state table every second */ 1012#ifdef __FreeBSD__ 1013 if(!pf_purge_expired_states(1 + (pf_status.states 1014 / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) { 1015 PF_UNLOCK(); 1016 sx_sunlock(&pf_consistency_lock); 1017 sx_xlock(&pf_consistency_lock); 1018 PF_LOCK(); 1019 locked = 1; 1020 1021 pf_purge_expired_states(1 + (pf_status.states 1022 / pf_default_rule.timeout[PFTM_INTERVAL]), 1); 1023 } 1024#else 1025 pf_purge_expired_states(1 + (pf_status.states 1026 / pf_default_rule.timeout[PFTM_INTERVAL])); 1027#endif 1028 1029 /* purge other expired types every PFTM_INTERVAL seconds */ 1030 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) { 1031 pf_purge_expired_fragments(); 1032 if (!pf_purge_expired_src_nodes(locked)) { 1033 PF_UNLOCK(); 1034 sx_sunlock(&pf_consistency_lock); 1035 sx_xlock(&pf_consistency_lock); 1036 PF_LOCK(); 1037 locked = 1; 1038 pf_purge_expired_src_nodes(1); 1039 } 1040 nloops = 0; 1041 } 1042 1043 splx(s); 1044#ifdef __FreeBSD__ 1045 PF_UNLOCK(); 1046 if (locked) 1047 sx_xunlock(&pf_consistency_lock); 1048 else 1049 sx_sunlock(&pf_consistency_lock); 1050#endif 1051 } 1052} 1053 1054u_int32_t 1055pf_state_expires(const struct pf_state *state) 1056{ 1057 u_int32_t timeout; 1058 u_int32_t start; 1059 u_int32_t end; 1060 u_int32_t states; 1061 1062 /* handle all PFTM_* > PFTM_MAX here */ 1063 if (state->timeout == PFTM_PURGE) 1064 return (time_second); 1065 if (state->timeout == PFTM_UNTIL_PACKET) 1066 return (0); 1067#ifdef __FreeBSD__ 1068 KASSERT(state->timeout != PFTM_UNLINKED, 1069 ("pf_state_expires: timeout == PFTM_UNLINKED")); 1070 KASSERT((state->timeout < PFTM_MAX), 1071 ("pf_state_expires: timeout > PFTM_MAX")); 1072#else 1073 KASSERT(state->timeout != PFTM_UNLINKED); 1074 KASSERT(state->timeout < PFTM_MAX); 1075#endif 1076 timeout = state->rule.ptr->timeout[state->timeout]; 1077 if (!timeout) 1078 timeout = pf_default_rule.timeout[state->timeout]; 1079 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START]; 1080 if (start) { 1081 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END]; 1082 states = state->rule.ptr->states; 1083 } else { 1084 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START]; 1085 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END]; 1086 states = pf_status.states; 1087 } 1088 if (end && states > start && start < end) { 1089 if (states < end) 1090 return (state->expire + timeout * (end - states) / 1091 (end - start)); 1092 else 1093 return (time_second); 1094 } 1095 return (state->expire + timeout); 1096} 1097 1098#ifdef __FreeBSD__ 1099int 1100pf_purge_expired_src_nodes(int waslocked) 1101#else 1102void 1103pf_purge_expired_src_nodes(int waslocked) 1104#endif 1105{ 1106 struct pf_src_node *cur, *next; 1107 int locked = waslocked; 1108 1109 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) { 1110 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur); 1111 1112 if (cur->states <= 0 && cur->expire <= time_second) { 1113 if (! locked) { 1114#ifdef __FreeBSD__ 1115 if (!sx_try_upgrade(&pf_consistency_lock)) 1116 return (0); 1117#else 1118 rw_enter_write(&pf_consistency_lock); 1119#endif 1120 next = RB_NEXT(pf_src_tree, 1121 &tree_src_tracking, cur); 1122 locked = 1; 1123 } 1124 if (cur->rule.ptr != NULL) { 1125 cur->rule.ptr->src_nodes--; 1126 if (cur->rule.ptr->states <= 0 && 1127 cur->rule.ptr->max_src_nodes <= 0) 1128 pf_rm_rule(NULL, cur->rule.ptr); 1129 } 1130 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur); 1131 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 1132 pf_status.src_nodes--; 1133 pool_put(&pf_src_tree_pl, cur); 1134 } 1135 } 1136 1137 if (locked && !waslocked) 1138#ifdef __FreeBSD__ 1139 sx_downgrade(&pf_consistency_lock); 1140#else 1141 rw_exit_write(&pf_consistency_lock); 1142#endif 1143 1144#ifdef __FreeBSD__ 1145 return (1); 1146#endif 1147} 1148 1149void 1150pf_src_tree_remove_state(struct pf_state *s) 1151{ 1152 u_int32_t timeout; 1153 1154 if (s->src_node != NULL) { 1155 if (s->proto == IPPROTO_TCP) { 1156 if (s->src.tcp_est) 1157 --s->src_node->conn; 1158 } 1159 if (--s->src_node->states <= 0) { 1160 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1161 if (!timeout) 1162 timeout = 1163 pf_default_rule.timeout[PFTM_SRC_NODE]; 1164 s->src_node->expire = time_second + timeout; 1165 } 1166 } 1167 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) { 1168 if (--s->nat_src_node->states <= 0) { 1169 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE]; 1170 if (!timeout) 1171 timeout = 1172 pf_default_rule.timeout[PFTM_SRC_NODE]; 1173 s->nat_src_node->expire = time_second + timeout; 1174 } 1175 } 1176 s->src_node = s->nat_src_node = NULL; 1177} 1178 1179/* callers should be at splsoftnet */ 1180void 1181pf_unlink_state(struct pf_state *cur) 1182{ 1183#ifdef __FreeBSD__ 1184 if (cur->local_flags & PFSTATE_EXPIRING) 1185 return; 1186 cur->local_flags |= PFSTATE_EXPIRING; 1187#endif 1188 if (cur->src.state == PF_TCPS_PROXY_DST) { 1189#ifdef __FreeBSD__ 1190 pf_send_tcp(NULL, cur->rule.ptr, cur->af, 1191#else 1192 pf_send_tcp(cur->rule.ptr, cur->af, 1193#endif 1194 &cur->ext.addr, &cur->lan.addr, 1195 cur->ext.port, cur->lan.port, 1196 cur->src.seqhi, cur->src.seqlo + 1, 1197 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL); 1198 } 1199 RB_REMOVE(pf_state_tree_ext_gwy, 1200 &cur->u.s.kif->pfik_ext_gwy, cur); 1201 RB_REMOVE(pf_state_tree_lan_ext, 1202 &cur->u.s.kif->pfik_lan_ext, cur); 1203 RB_REMOVE(pf_state_tree_id, &tree_id, cur); 1204#if NPFSYNC 1205 if (cur->creatorid == pf_status.hostid) 1206 pfsync_delete_state(cur); 1207#endif 1208 cur->timeout = PFTM_UNLINKED; 1209 pf_src_tree_remove_state(cur); 1210} 1211 1212/* callers should be at splsoftnet and hold the 1213 * write_lock on pf_consistency_lock */ 1214void 1215pf_free_state(struct pf_state *cur) 1216{ 1217#if NPFSYNC 1218 if (pfsyncif != NULL && 1219 (pfsyncif->sc_bulk_send_next == cur || 1220 pfsyncif->sc_bulk_terminator == cur)) 1221 return; 1222#endif 1223#ifdef __FreeBSD__ 1224 KASSERT(cur->timeout == PFTM_UNLINKED, 1225 ("pf_free_state: cur->timeout != PFTM_UNLINKED")); 1226#else 1227 KASSERT(cur->timeout == PFTM_UNLINKED); 1228#endif 1229 if (--cur->rule.ptr->states <= 0 && 1230 cur->rule.ptr->src_nodes <= 0) 1231 pf_rm_rule(NULL, cur->rule.ptr); 1232 if (cur->nat_rule.ptr != NULL) 1233 if (--cur->nat_rule.ptr->states <= 0 && 1234 cur->nat_rule.ptr->src_nodes <= 0) 1235 pf_rm_rule(NULL, cur->nat_rule.ptr); 1236 if (cur->anchor.ptr != NULL) 1237 if (--cur->anchor.ptr->states <= 0) 1238 pf_rm_rule(NULL, cur->anchor.ptr); 1239 pf_normalize_tcp_cleanup(cur); 1240 pfi_kif_unref(cur->u.s.kif, PFI_KIF_REF_STATE); 1241 TAILQ_REMOVE(&state_list, cur, u.s.entry_list); 1242 if (cur->tag) 1243 pf_tag_unref(cur->tag); 1244 pool_put(&pf_state_pl, cur); 1245 pf_status.fcounters[FCNT_STATE_REMOVALS]++; 1246 pf_status.states--; 1247} 1248 1249#ifdef __FreeBSD__ 1250int 1251pf_purge_expired_states(u_int32_t maxcheck, int waslocked) 1252#else 1253void 1254pf_purge_expired_states(u_int32_t maxcheck) 1255#endif 1256{ 1257 static struct pf_state *cur = NULL; 1258 struct pf_state *next; 1259#ifdef __FreeBSD__ 1260 int locked = waslocked; 1261#else 1262 int locked = 0; 1263#endif 1264 1265 while (maxcheck--) { 1266 /* wrap to start of list when we hit the end */ 1267 if (cur == NULL) { 1268 cur = TAILQ_FIRST(&state_list); 1269 if (cur == NULL) 1270 break; /* list empty */ 1271 } 1272 1273 /* get next state, as cur may get deleted */ 1274 next = TAILQ_NEXT(cur, u.s.entry_list); 1275 1276 if (cur->timeout == PFTM_UNLINKED) { 1277 /* free unlinked state */ 1278 if (! locked) { 1279#ifdef __FreeBSD__ 1280 if (!sx_try_upgrade(&pf_consistency_lock)) 1281 return (0); 1282#else 1283 rw_enter_write(&pf_consistency_lock); 1284#endif 1285 locked = 1; 1286 } 1287 pf_free_state(cur); 1288 } else if (pf_state_expires(cur) <= time_second) { 1289 /* unlink and free expired state */ 1290 pf_unlink_state(cur); 1291 if (! locked) { 1292#ifdef __FreeBSD__ 1293 if (!sx_try_upgrade(&pf_consistency_lock)) 1294 return (0); 1295#else 1296 rw_enter_write(&pf_consistency_lock); 1297#endif 1298 locked = 1; 1299 } 1300 pf_free_state(cur); 1301 } 1302 cur = next; 1303 } 1304 1305#ifdef __FreeBSD__ 1306 if (!waslocked && locked) 1307 sx_downgrade(&pf_consistency_lock); 1308 1309 return (1); 1310#else 1311 if (locked) 1312 rw_exit_write(&pf_consistency_lock); 1313#endif 1314} 1315 1316int 1317pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw) 1318{ 1319 if (aw->type != PF_ADDR_TABLE) 1320 return (0); 1321 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL) 1322 return (1); 1323 return (0); 1324} 1325 1326void 1327pf_tbladdr_remove(struct pf_addr_wrap *aw) 1328{ 1329 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL) 1330 return; 1331 pfr_detach_table(aw->p.tbl); 1332 aw->p.tbl = NULL; 1333} 1334 1335void 1336pf_tbladdr_copyout(struct pf_addr_wrap *aw) 1337{ 1338 struct pfr_ktable *kt = aw->p.tbl; 1339 1340 if (aw->type != PF_ADDR_TABLE || kt == NULL) 1341 return; 1342 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL) 1343 kt = kt->pfrkt_root; 1344 aw->p.tbl = NULL; 1345 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ? 1346 kt->pfrkt_cnt : -1; 1347} 1348 1349void 1350pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af) 1351{ 1352 switch (af) { 1353#ifdef INET 1354 case AF_INET: { 1355 u_int32_t a = ntohl(addr->addr32[0]); 1356 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, 1357 (a>>8)&255, a&255); 1358 if (p) { 1359 p = ntohs(p); 1360 printf(":%u", p); 1361 } 1362 break; 1363 } 1364#endif /* INET */ 1365#ifdef INET6 1366 case AF_INET6: { 1367 u_int16_t b; 1368 u_int8_t i, curstart = 255, curend = 0, 1369 maxstart = 0, maxend = 0; 1370 for (i = 0; i < 8; i++) { 1371 if (!addr->addr16[i]) { 1372 if (curstart == 255) 1373 curstart = i; 1374 else 1375 curend = i; 1376 } else { 1377 if (curstart) { 1378 if ((curend - curstart) > 1379 (maxend - maxstart)) { 1380 maxstart = curstart; 1381 maxend = curend; 1382 curstart = 255; 1383 } 1384 } 1385 } 1386 } 1387 for (i = 0; i < 8; i++) { 1388 if (i >= maxstart && i <= maxend) { 1389 if (maxend != 7) { 1390 if (i == maxstart) 1391 printf(":"); 1392 } else { 1393 if (i == maxend) 1394 printf(":"); 1395 } 1396 } else { 1397 b = ntohs(addr->addr16[i]); 1398 printf("%x", b); 1399 if (i < 7) 1400 printf(":"); 1401 } 1402 } 1403 if (p) { 1404 p = ntohs(p); 1405 printf("[%u]", p); 1406 } 1407 break; 1408 } 1409#endif /* INET6 */ 1410 } 1411} 1412 1413void 1414pf_print_state(struct pf_state *s) 1415{ 1416 switch (s->proto) { 1417 case IPPROTO_TCP: 1418 printf("TCP "); 1419 break; 1420 case IPPROTO_UDP: 1421 printf("UDP "); 1422 break; 1423 case IPPROTO_ICMP: 1424 printf("ICMP "); 1425 break; 1426 case IPPROTO_ICMPV6: 1427 printf("ICMPV6 "); 1428 break; 1429 default: 1430 printf("%u ", s->proto); 1431 break; 1432 } 1433 pf_print_host(&s->lan.addr, s->lan.port, s->af); 1434 printf(" "); 1435 pf_print_host(&s->gwy.addr, s->gwy.port, s->af); 1436 printf(" "); 1437 pf_print_host(&s->ext.addr, s->ext.port, s->af); 1438 printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo, 1439 s->src.seqhi, s->src.max_win, s->src.seqdiff); 1440 if (s->src.wscale && s->dst.wscale) 1441 printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK); 1442 printf("]"); 1443 printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo, 1444 s->dst.seqhi, s->dst.max_win, s->dst.seqdiff); 1445 if (s->src.wscale && s->dst.wscale) 1446 printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK); 1447 printf("]"); 1448 printf(" %u:%u", s->src.state, s->dst.state); 1449} 1450 1451void 1452pf_print_flags(u_int8_t f) 1453{ 1454 if (f) 1455 printf(" "); 1456 if (f & TH_FIN) 1457 printf("F"); 1458 if (f & TH_SYN) 1459 printf("S"); 1460 if (f & TH_RST) 1461 printf("R"); 1462 if (f & TH_PUSH) 1463 printf("P"); 1464 if (f & TH_ACK) 1465 printf("A"); 1466 if (f & TH_URG) 1467 printf("U"); 1468 if (f & TH_ECE) 1469 printf("E"); 1470 if (f & TH_CWR) 1471 printf("W"); 1472} 1473 1474#define PF_SET_SKIP_STEPS(i) \ 1475 do { \ 1476 while (head[i] != cur) { \ 1477 head[i]->skip[i].ptr = cur; \ 1478 head[i] = TAILQ_NEXT(head[i], entries); \ 1479 } \ 1480 } while (0) 1481 1482void 1483pf_calc_skip_steps(struct pf_rulequeue *rules) 1484{ 1485 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT]; 1486 int i; 1487 1488 cur = TAILQ_FIRST(rules); 1489 prev = cur; 1490 for (i = 0; i < PF_SKIP_COUNT; ++i) 1491 head[i] = cur; 1492 while (cur != NULL) { 1493 1494 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot) 1495 PF_SET_SKIP_STEPS(PF_SKIP_IFP); 1496 if (cur->direction != prev->direction) 1497 PF_SET_SKIP_STEPS(PF_SKIP_DIR); 1498 if (cur->af != prev->af) 1499 PF_SET_SKIP_STEPS(PF_SKIP_AF); 1500 if (cur->proto != prev->proto) 1501 PF_SET_SKIP_STEPS(PF_SKIP_PROTO); 1502 if (cur->src.neg != prev->src.neg || 1503 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr)) 1504 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR); 1505 if (cur->src.port[0] != prev->src.port[0] || 1506 cur->src.port[1] != prev->src.port[1] || 1507 cur->src.port_op != prev->src.port_op) 1508 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT); 1509 if (cur->dst.neg != prev->dst.neg || 1510 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr)) 1511 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR); 1512 if (cur->dst.port[0] != prev->dst.port[0] || 1513 cur->dst.port[1] != prev->dst.port[1] || 1514 cur->dst.port_op != prev->dst.port_op) 1515 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT); 1516 1517 prev = cur; 1518 cur = TAILQ_NEXT(cur, entries); 1519 } 1520 for (i = 0; i < PF_SKIP_COUNT; ++i) 1521 PF_SET_SKIP_STEPS(i); 1522} 1523 1524int 1525pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2) 1526{ 1527 if (aw1->type != aw2->type) 1528 return (1); 1529 switch (aw1->type) { 1530 case PF_ADDR_ADDRMASK: 1531 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0)) 1532 return (1); 1533 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0)) 1534 return (1); 1535 return (0); 1536 case PF_ADDR_DYNIFTL: 1537 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt); 1538 case PF_ADDR_NOROUTE: 1539 case PF_ADDR_URPFFAILED: 1540 return (0); 1541 case PF_ADDR_TABLE: 1542 return (aw1->p.tbl != aw2->p.tbl); 1543 case PF_ADDR_RTLABEL: 1544 return (aw1->v.rtlabel != aw2->v.rtlabel); 1545 default: 1546 printf("invalid address type: %d\n", aw1->type); 1547 return (1); 1548 } 1549} 1550 1551u_int16_t 1552pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp) 1553{ 1554 u_int32_t l; 1555 1556 if (udp && !cksum) 1557 return (0x0000); 1558 l = cksum + old - new; 1559 l = (l >> 16) + (l & 65535); 1560 l = l & 65535; 1561 if (udp && !l) 1562 return (0xFFFF); 1563 return (l); 1564} 1565 1566void 1567pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc, 1568 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af) 1569{ 1570 struct pf_addr ao; 1571 u_int16_t po = *p; 1572 1573 PF_ACPY(&ao, a, af); 1574 PF_ACPY(a, an, af); 1575 1576 *p = pn; 1577 1578 switch (af) { 1579#ifdef INET 1580 case AF_INET: 1581 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1582 ao.addr16[0], an->addr16[0], 0), 1583 ao.addr16[1], an->addr16[1], 0); 1584 *p = pn; 1585 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1586 ao.addr16[0], an->addr16[0], u), 1587 ao.addr16[1], an->addr16[1], u), 1588 po, pn, u); 1589 break; 1590#endif /* INET */ 1591#ifdef INET6 1592 case AF_INET6: 1593 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1594 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1595 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc, 1596 ao.addr16[0], an->addr16[0], u), 1597 ao.addr16[1], an->addr16[1], u), 1598 ao.addr16[2], an->addr16[2], u), 1599 ao.addr16[3], an->addr16[3], u), 1600 ao.addr16[4], an->addr16[4], u), 1601 ao.addr16[5], an->addr16[5], u), 1602 ao.addr16[6], an->addr16[6], u), 1603 ao.addr16[7], an->addr16[7], u), 1604 po, pn, u); 1605 break; 1606#endif /* INET6 */ 1607 } 1608} 1609 1610 1611/* Changes a u_int32_t. Uses a void * so there are no align restrictions */ 1612void 1613pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u) 1614{ 1615 u_int32_t ao; 1616 1617 memcpy(&ao, a, sizeof(ao)); 1618 memcpy(a, &an, sizeof(u_int32_t)); 1619 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u), 1620 ao % 65536, an % 65536, u); 1621} 1622 1623#ifdef INET6 1624void 1625pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u) 1626{ 1627 struct pf_addr ao; 1628 1629 PF_ACPY(&ao, a, AF_INET6); 1630 PF_ACPY(a, an, AF_INET6); 1631 1632 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1633 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1634 pf_cksum_fixup(pf_cksum_fixup(*c, 1635 ao.addr16[0], an->addr16[0], u), 1636 ao.addr16[1], an->addr16[1], u), 1637 ao.addr16[2], an->addr16[2], u), 1638 ao.addr16[3], an->addr16[3], u), 1639 ao.addr16[4], an->addr16[4], u), 1640 ao.addr16[5], an->addr16[5], u), 1641 ao.addr16[6], an->addr16[6], u), 1642 ao.addr16[7], an->addr16[7], u); 1643} 1644#endif /* INET6 */ 1645 1646void 1647pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa, 1648 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c, 1649 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af) 1650{ 1651 struct pf_addr oia, ooa; 1652 1653 PF_ACPY(&oia, ia, af); 1654 PF_ACPY(&ooa, oa, af); 1655 1656 /* Change inner protocol port, fix inner protocol checksum. */ 1657 if (ip != NULL) { 1658 u_int16_t oip = *ip; 1659 u_int32_t opc = 0; /* make the compiler happy */ 1660 1661 if (pc != NULL) 1662 opc = *pc; 1663 *ip = np; 1664 if (pc != NULL) 1665 *pc = pf_cksum_fixup(*pc, oip, *ip, u); 1666 *ic = pf_cksum_fixup(*ic, oip, *ip, 0); 1667 if (pc != NULL) 1668 *ic = pf_cksum_fixup(*ic, opc, *pc, 0); 1669 } 1670 /* Change inner ip address, fix inner ip and icmp checksums. */ 1671 PF_ACPY(ia, na, af); 1672 switch (af) { 1673#ifdef INET 1674 case AF_INET: { 1675 u_int32_t oh2c = *h2c; 1676 1677 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c, 1678 oia.addr16[0], ia->addr16[0], 0), 1679 oia.addr16[1], ia->addr16[1], 0); 1680 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic, 1681 oia.addr16[0], ia->addr16[0], 0), 1682 oia.addr16[1], ia->addr16[1], 0); 1683 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0); 1684 break; 1685 } 1686#endif /* INET */ 1687#ifdef INET6 1688 case AF_INET6: 1689 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1690 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1691 pf_cksum_fixup(pf_cksum_fixup(*ic, 1692 oia.addr16[0], ia->addr16[0], u), 1693 oia.addr16[1], ia->addr16[1], u), 1694 oia.addr16[2], ia->addr16[2], u), 1695 oia.addr16[3], ia->addr16[3], u), 1696 oia.addr16[4], ia->addr16[4], u), 1697 oia.addr16[5], ia->addr16[5], u), 1698 oia.addr16[6], ia->addr16[6], u), 1699 oia.addr16[7], ia->addr16[7], u); 1700 break; 1701#endif /* INET6 */ 1702 } 1703 /* Change outer ip address, fix outer ip or icmpv6 checksum. */ 1704 PF_ACPY(oa, na, af); 1705 switch (af) { 1706#ifdef INET 1707 case AF_INET: 1708 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc, 1709 ooa.addr16[0], oa->addr16[0], 0), 1710 ooa.addr16[1], oa->addr16[1], 0); 1711 break; 1712#endif /* INET */ 1713#ifdef INET6 1714 case AF_INET6: 1715 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1716 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup( 1717 pf_cksum_fixup(pf_cksum_fixup(*ic, 1718 ooa.addr16[0], oa->addr16[0], u), 1719 ooa.addr16[1], oa->addr16[1], u), 1720 ooa.addr16[2], oa->addr16[2], u), 1721 ooa.addr16[3], oa->addr16[3], u), 1722 ooa.addr16[4], oa->addr16[4], u), 1723 ooa.addr16[5], oa->addr16[5], u), 1724 ooa.addr16[6], oa->addr16[6], u), 1725 ooa.addr16[7], oa->addr16[7], u); 1726 break; 1727#endif /* INET6 */ 1728 } 1729} 1730 1731 1732/* 1733 * Need to modulate the sequence numbers in the TCP SACK option 1734 * (credits to Krzysztof Pfaff for report and patch) 1735 */ 1736int 1737pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd, 1738 struct tcphdr *th, struct pf_state_peer *dst) 1739{ 1740 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen; 1741#ifdef __FreeBSD__ 1742 u_int8_t opts[TCP_MAXOLEN], *opt = opts; 1743#else 1744 u_int8_t opts[MAX_TCPOPTLEN], *opt = opts; 1745#endif 1746 int copyback = 0, i, olen; 1747 struct sackblk sack; 1748 1749#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2) 1750 if (hlen < TCPOLEN_SACKLEN || 1751 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af)) 1752 return 0; 1753 1754 while (hlen >= TCPOLEN_SACKLEN) { 1755 olen = opt[1]; 1756 switch (*opt) { 1757 case TCPOPT_EOL: /* FALLTHROUGH */ 1758 case TCPOPT_NOP: 1759 opt++; 1760 hlen--; 1761 break; 1762 case TCPOPT_SACK: 1763 if (olen > hlen) 1764 olen = hlen; 1765 if (olen >= TCPOLEN_SACKLEN) { 1766 for (i = 2; i + TCPOLEN_SACK <= olen; 1767 i += TCPOLEN_SACK) { 1768 memcpy(&sack, &opt[i], sizeof(sack)); 1769 pf_change_a(&sack.start, &th->th_sum, 1770 htonl(ntohl(sack.start) - 1771 dst->seqdiff), 0); 1772 pf_change_a(&sack.end, &th->th_sum, 1773 htonl(ntohl(sack.end) - 1774 dst->seqdiff), 0); 1775 memcpy(&opt[i], &sack, sizeof(sack)); 1776 } 1777 copyback = 1; 1778 } 1779 /* FALLTHROUGH */ 1780 default: 1781 if (olen < 2) 1782 olen = 2; 1783 hlen -= olen; 1784 opt += olen; 1785 } 1786 } 1787 1788 if (copyback) 1789#ifdef __FreeBSD__ 1790 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts); 1791#else 1792 m_copyback(m, off + sizeof(*th), thoptlen, opts); 1793#endif 1794 return (copyback); 1795} 1796 1797void 1798#ifdef __FreeBSD__ 1799pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af, 1800#else 1801pf_send_tcp(const struct pf_rule *r, sa_family_t af, 1802#endif 1803 const struct pf_addr *saddr, const struct pf_addr *daddr, 1804 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack, 1805 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag, 1806 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp) 1807{ 1808 struct mbuf *m; 1809 int len, tlen; 1810#ifdef INET 1811 struct ip *h; 1812#endif /* INET */ 1813#ifdef INET6 1814 struct ip6_hdr *h6; 1815#endif /* INET6 */ 1816 struct tcphdr *th; 1817 char *opt; 1818 struct pf_mtag *pf_mtag; 1819 1820#ifdef __FreeBSD__ 1821 KASSERT( 1822#ifdef INET 1823 af == AF_INET 1824#else 1825 0 1826#endif 1827 || 1828#ifdef INET6 1829 af == AF_INET6 1830#else 1831 0 1832#endif 1833 , ("Unsupported AF %d", af)); 1834 len = 0; 1835 th = NULL; 1836#ifdef INET 1837 h = NULL; 1838#endif 1839#ifdef INET6 1840 h6 = NULL; 1841#endif 1842#endif 1843 1844 /* maximum segment size tcp option */ 1845 tlen = sizeof(struct tcphdr); 1846 if (mss) 1847 tlen += 4; 1848 1849 switch (af) { 1850#ifdef INET 1851 case AF_INET: 1852 len = sizeof(struct ip) + tlen; 1853 break; 1854#endif /* INET */ 1855#ifdef INET6 1856 case AF_INET6: 1857 len = sizeof(struct ip6_hdr) + tlen; 1858 break; 1859#endif /* INET6 */ 1860 } 1861 1862 /* create outgoing mbuf */ 1863 m = m_gethdr(M_DONTWAIT, MT_HEADER); 1864 if (m == NULL) 1865 return; 1866#ifdef __FreeBSD__ 1867#ifdef MAC 1868 if (replyto) 1869 mac_netinet_firewall_reply(replyto, m); 1870 else 1871 mac_netinet_firewall_send(m); 1872#else 1873 (void)replyto; 1874#endif 1875#endif 1876 if ((pf_mtag = pf_get_mtag(m)) == NULL) { 1877 m_freem(m); 1878 return; 1879 } 1880 if (tag) 1881#ifdef __FreeBSD__ 1882 m->m_flags |= M_SKIP_FIREWALL; 1883#else 1884 pf_mtag->flags |= PF_TAG_GENERATED; 1885#endif 1886 1887 pf_mtag->tag = rtag; 1888 1889 if (r != NULL && r->rtableid >= 0) 1890#ifdef __FreeBSD__ 1891 { 1892 M_SETFIB(m, r->rtableid); 1893#endif 1894 pf_mtag->rtableid = r->rtableid; 1895#ifdef __FreeBSD__ 1896 } 1897#endif 1898#ifdef ALTQ 1899 if (r != NULL && r->qid) { 1900 pf_mtag->qid = r->qid; 1901 /* add hints for ecn */ 1902 pf_mtag->af = af; 1903 pf_mtag->hdr = mtod(m, struct ip *); 1904 } 1905#endif /* ALTQ */ 1906 m->m_data += max_linkhdr; 1907 m->m_pkthdr.len = m->m_len = len; 1908 m->m_pkthdr.rcvif = NULL; 1909 bzero(m->m_data, len); 1910 switch (af) { 1911#ifdef INET 1912 case AF_INET: 1913 h = mtod(m, struct ip *); 1914 1915 /* IP header fields included in the TCP checksum */ 1916 h->ip_p = IPPROTO_TCP; 1917 h->ip_len = htons(tlen); 1918 h->ip_src.s_addr = saddr->v4.s_addr; 1919 h->ip_dst.s_addr = daddr->v4.s_addr; 1920 1921 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip)); 1922 break; 1923#endif /* INET */ 1924#ifdef INET6 1925 case AF_INET6: 1926 h6 = mtod(m, struct ip6_hdr *); 1927 1928 /* IP header fields included in the TCP checksum */ 1929 h6->ip6_nxt = IPPROTO_TCP; 1930 h6->ip6_plen = htons(tlen); 1931 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr)); 1932 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr)); 1933 1934 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr)); 1935 break; 1936#endif /* INET6 */ 1937 } 1938 1939 /* TCP header */ 1940 th->th_sport = sport; 1941 th->th_dport = dport; 1942 th->th_seq = htonl(seq); 1943 th->th_ack = htonl(ack); 1944 th->th_off = tlen >> 2; 1945 th->th_flags = flags; 1946 th->th_win = htons(win); 1947 1948 if (mss) { 1949 opt = (char *)(th + 1); 1950 opt[0] = TCPOPT_MAXSEG; 1951 opt[1] = 4; 1952 HTONS(mss); 1953 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2); 1954 } 1955 1956 switch (af) { 1957#ifdef INET 1958 case AF_INET: 1959 /* TCP checksum */ 1960 th->th_sum = in_cksum(m, len); 1961 1962 /* Finish the IP header */ 1963 h->ip_v = 4; 1964 h->ip_hl = sizeof(*h) >> 2; 1965 h->ip_tos = IPTOS_LOWDELAY; 1966#ifdef __FreeBSD__ 1967 h->ip_off = V_path_mtu_discovery ? IP_DF : 0; 1968 h->ip_len = len; 1969#else 1970 h->ip_off = htons(ip_mtudisc ? IP_DF : 0); 1971 h->ip_len = htons(len); 1972#endif 1973 h->ip_ttl = ttl ? ttl : V_ip_defttl; 1974 h->ip_sum = 0; 1975 if (eh == NULL) { 1976#ifdef __FreeBSD__ 1977 PF_UNLOCK(); 1978 ip_output(m, (void *)NULL, (void *)NULL, 0, 1979 (void *)NULL, (void *)NULL); 1980 PF_LOCK(); 1981#else /* ! __FreeBSD__ */ 1982 ip_output(m, (void *)NULL, (void *)NULL, 0, 1983 (void *)NULL, (void *)NULL); 1984#endif 1985 } else { 1986 struct route ro; 1987 struct rtentry rt; 1988 struct ether_header *e = (void *)ro.ro_dst.sa_data; 1989 1990 if (ifp == NULL) { 1991 m_freem(m); 1992 return; 1993 } 1994 rt.rt_ifp = ifp; 1995 ro.ro_rt = &rt; 1996 ro.ro_dst.sa_len = sizeof(ro.ro_dst); 1997 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT; 1998 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN); 1999 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN); 2000 e->ether_type = eh->ether_type; 2001#ifdef __FreeBSD__ 2002 PF_UNLOCK(); 2003 /* XXX_IMPORT: later */ 2004 ip_output(m, (void *)NULL, &ro, 0, 2005 (void *)NULL, (void *)NULL); 2006 PF_LOCK(); 2007#else /* ! __FreeBSD__ */ 2008 ip_output(m, (void *)NULL, &ro, IP_ROUTETOETHER, 2009 (void *)NULL, (void *)NULL); 2010#endif 2011 } 2012 break; 2013#endif /* INET */ 2014#ifdef INET6 2015 case AF_INET6: 2016 /* TCP checksum */ 2017 th->th_sum = in6_cksum(m, IPPROTO_TCP, 2018 sizeof(struct ip6_hdr), tlen); 2019 2020 h6->ip6_vfc |= IPV6_VERSION; 2021 h6->ip6_hlim = IPV6_DEFHLIM; 2022 2023#ifdef __FreeBSD__ 2024 PF_UNLOCK(); 2025 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 2026 PF_LOCK(); 2027#else 2028 ip6_output(m, NULL, NULL, 0, NULL, NULL); 2029#endif 2030 break; 2031#endif /* INET6 */ 2032 } 2033} 2034 2035void 2036pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af, 2037 struct pf_rule *r) 2038{ 2039 struct pf_mtag *pf_mtag; 2040 struct mbuf *m0; 2041#ifdef __FreeBSD__ 2042#ifdef INET 2043 struct ip *ip; 2044#endif 2045#endif 2046 2047#ifdef __FreeBSD__ 2048 m0 = m_copypacket(m, M_DONTWAIT); 2049 if (m0 == NULL) 2050 return; 2051#else 2052 m0 = m_copy(m, 0, M_COPYALL); 2053#endif 2054 if ((pf_mtag = pf_get_mtag(m0)) == NULL) 2055 return; 2056#ifdef __FreeBSD__ 2057 /* XXX: revisit */ 2058 m0->m_flags |= M_SKIP_FIREWALL; 2059#else 2060 pf_mtag->flags |= PF_TAG_GENERATED; 2061#endif 2062 2063 if (r->rtableid >= 0) 2064#ifdef __FreeBSD__ 2065 { 2066 M_SETFIB(m0, r->rtableid); 2067#endif 2068 pf_mtag->rtableid = r->rtableid; 2069#ifdef __FreeBSD__ 2070 } 2071#endif 2072 2073#ifdef ALTQ 2074 if (r->qid) { 2075 pf_mtag->qid = r->qid; 2076 /* add hints for ecn */ 2077 pf_mtag->af = af; 2078 pf_mtag->hdr = mtod(m0, struct ip *); 2079 } 2080#endif /* ALTQ */ 2081 2082 switch (af) { 2083#ifdef INET 2084 case AF_INET: 2085#ifdef __FreeBSD__ 2086 /* icmp_error() expects host byte ordering */ 2087 ip = mtod(m0, struct ip *); 2088 NTOHS(ip->ip_len); 2089 NTOHS(ip->ip_off); 2090 PF_UNLOCK(); 2091 icmp_error(m0, type, code, 0, 0); 2092 PF_LOCK(); 2093#else 2094 icmp_error(m0, type, code, 0, 0); 2095#endif 2096 break; 2097#endif /* INET */ 2098#ifdef INET6 2099 case AF_INET6: 2100#ifdef __FreeBSD__ 2101 PF_UNLOCK(); 2102#endif 2103 icmp6_error(m0, type, code, 0); 2104#ifdef __FreeBSD__ 2105 PF_LOCK(); 2106#endif 2107 break; 2108#endif /* INET6 */ 2109 } 2110} 2111 2112/* 2113 * Return 1 if the addresses a and b match (with mask m), otherwise return 0. 2114 * If n is 0, they match if they are equal. If n is != 0, they match if they 2115 * are different. 2116 */ 2117int 2118pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m, 2119 struct pf_addr *b, sa_family_t af) 2120{ 2121 int match = 0; 2122 2123 switch (af) { 2124#ifdef INET 2125 case AF_INET: 2126 if ((a->addr32[0] & m->addr32[0]) == 2127 (b->addr32[0] & m->addr32[0])) 2128 match++; 2129 break; 2130#endif /* INET */ 2131#ifdef INET6 2132 case AF_INET6: 2133 if (((a->addr32[0] & m->addr32[0]) == 2134 (b->addr32[0] & m->addr32[0])) && 2135 ((a->addr32[1] & m->addr32[1]) == 2136 (b->addr32[1] & m->addr32[1])) && 2137 ((a->addr32[2] & m->addr32[2]) == 2138 (b->addr32[2] & m->addr32[2])) && 2139 ((a->addr32[3] & m->addr32[3]) == 2140 (b->addr32[3] & m->addr32[3]))) 2141 match++; 2142 break; 2143#endif /* INET6 */ 2144 } 2145 if (match) { 2146 if (n) 2147 return (0); 2148 else 2149 return (1); 2150 } else { 2151 if (n) 2152 return (1); 2153 else 2154 return (0); 2155 } 2156} 2157 2158int 2159pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p) 2160{ 2161 switch (op) { 2162 case PF_OP_IRG: 2163 return ((p > a1) && (p < a2)); 2164 case PF_OP_XRG: 2165 return ((p < a1) || (p > a2)); 2166 case PF_OP_RRG: 2167 return ((p >= a1) && (p <= a2)); 2168 case PF_OP_EQ: 2169 return (p == a1); 2170 case PF_OP_NE: 2171 return (p != a1); 2172 case PF_OP_LT: 2173 return (p < a1); 2174 case PF_OP_LE: 2175 return (p <= a1); 2176 case PF_OP_GT: 2177 return (p > a1); 2178 case PF_OP_GE: 2179 return (p >= a1); 2180 } 2181 return (0); /* never reached */ 2182} 2183 2184int 2185pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p) 2186{ 2187 NTOHS(a1); 2188 NTOHS(a2); 2189 NTOHS(p); 2190 return (pf_match(op, a1, a2, p)); 2191} 2192 2193int 2194pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u) 2195{ 2196 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2197 return (0); 2198 return (pf_match(op, a1, a2, u)); 2199} 2200 2201int 2202pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g) 2203{ 2204 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE) 2205 return (0); 2206 return (pf_match(op, a1, a2, g)); 2207} 2208 2209#ifndef __FreeBSD__ 2210struct pf_mtag * 2211pf_find_mtag(struct mbuf *m) 2212{ 2213 struct m_tag *mtag; 2214 2215 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) 2216 return (NULL); 2217 2218 return ((struct pf_mtag *)(mtag + 1)); 2219} 2220 2221struct pf_mtag * 2222pf_get_mtag(struct mbuf *m) 2223{ 2224 struct m_tag *mtag; 2225 2226 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) == NULL) { 2227 mtag = m_tag_get(PACKET_TAG_PF, sizeof(struct pf_mtag), 2228 M_NOWAIT); 2229 if (mtag == NULL) 2230 return (NULL); 2231 bzero(mtag + 1, sizeof(struct pf_mtag)); 2232 m_tag_prepend(m, mtag); 2233 } 2234 2235 return ((struct pf_mtag *)(mtag + 1)); 2236} 2237#endif 2238 2239int 2240pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_mtag *pf_mtag, 2241 int *tag) 2242{ 2243 if (*tag == -1) 2244 *tag = pf_mtag->tag; 2245 2246 return ((!r->match_tag_not && r->match_tag == *tag) || 2247 (r->match_tag_not && r->match_tag != *tag)); 2248} 2249 2250int 2251pf_tag_packet(struct mbuf *m, struct pf_mtag *pf_mtag, int tag, int rtableid) 2252{ 2253 if (tag <= 0 && rtableid < 0) 2254 return (0); 2255 2256 if (pf_mtag == NULL) 2257 if ((pf_mtag = pf_get_mtag(m)) == NULL) 2258 return (1); 2259 if (tag > 0) 2260 pf_mtag->tag = tag; 2261 if (rtableid >= 0) 2262#ifdef __FreeBSD__ 2263 { 2264 M_SETFIB(m, rtableid); 2265#endif 2266 pf_mtag->rtableid = rtableid; 2267#ifdef __FreeBSD__ 2268 } 2269#endif 2270 2271 return (0); 2272} 2273 2274static void 2275pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n, 2276 struct pf_rule **r, struct pf_rule **a, int *match) 2277{ 2278 struct pf_anchor_stackframe *f; 2279 2280 (*r)->anchor->match = 0; 2281 if (match) 2282 *match = 0; 2283 if (*depth >= sizeof(pf_anchor_stack) / 2284 sizeof(pf_anchor_stack[0])) { 2285 printf("pf_step_into_anchor: stack overflow\n"); 2286 *r = TAILQ_NEXT(*r, entries); 2287 return; 2288 } else if (*depth == 0 && a != NULL) 2289 *a = *r; 2290 f = pf_anchor_stack + (*depth)++; 2291 f->rs = *rs; 2292 f->r = *r; 2293 if ((*r)->anchor_wildcard) { 2294 f->parent = &(*r)->anchor->children; 2295 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) == 2296 NULL) { 2297 *r = NULL; 2298 return; 2299 } 2300 *rs = &f->child->ruleset; 2301 } else { 2302 f->parent = NULL; 2303 f->child = NULL; 2304 *rs = &(*r)->anchor->ruleset; 2305 } 2306 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2307} 2308 2309int 2310pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n, 2311 struct pf_rule **r, struct pf_rule **a, int *match) 2312{ 2313 struct pf_anchor_stackframe *f; 2314 int quick = 0; 2315 2316 do { 2317 if (*depth <= 0) 2318 break; 2319 f = pf_anchor_stack + *depth - 1; 2320 if (f->parent != NULL && f->child != NULL) { 2321 if (f->child->match || 2322 (match != NULL && *match)) { 2323 f->r->anchor->match = 1; 2324 *match = 0; 2325 } 2326 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child); 2327 if (f->child != NULL) { 2328 *rs = &f->child->ruleset; 2329 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr); 2330 if (*r == NULL) 2331 continue; 2332 else 2333 break; 2334 } 2335 } 2336 (*depth)--; 2337 if (*depth == 0 && a != NULL) 2338 *a = NULL; 2339 *rs = f->rs; 2340 if (f->r->anchor->match || (match != NULL && *match)) 2341 quick = f->r->quick; 2342 *r = TAILQ_NEXT(f->r, entries); 2343 } while (*r == NULL); 2344 2345 return (quick); 2346} 2347 2348#ifdef INET6 2349void 2350pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr, 2351 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af) 2352{ 2353 switch (af) { 2354#ifdef INET 2355 case AF_INET: 2356 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2357 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2358 break; 2359#endif /* INET */ 2360 case AF_INET6: 2361 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) | 2362 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 2363 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) | 2364 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 2365 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) | 2366 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 2367 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) | 2368 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 2369 break; 2370 } 2371} 2372 2373void 2374pf_addr_inc(struct pf_addr *addr, sa_family_t af) 2375{ 2376 switch (af) { 2377#ifdef INET 2378 case AF_INET: 2379 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1); 2380 break; 2381#endif /* INET */ 2382 case AF_INET6: 2383 if (addr->addr32[3] == 0xffffffff) { 2384 addr->addr32[3] = 0; 2385 if (addr->addr32[2] == 0xffffffff) { 2386 addr->addr32[2] = 0; 2387 if (addr->addr32[1] == 0xffffffff) { 2388 addr->addr32[1] = 0; 2389 addr->addr32[0] = 2390 htonl(ntohl(addr->addr32[0]) + 1); 2391 } else 2392 addr->addr32[1] = 2393 htonl(ntohl(addr->addr32[1]) + 1); 2394 } else 2395 addr->addr32[2] = 2396 htonl(ntohl(addr->addr32[2]) + 1); 2397 } else 2398 addr->addr32[3] = 2399 htonl(ntohl(addr->addr32[3]) + 1); 2400 break; 2401 } 2402} 2403#endif /* INET6 */ 2404 2405#define mix(a,b,c) \ 2406 do { \ 2407 a -= b; a -= c; a ^= (c >> 13); \ 2408 b -= c; b -= a; b ^= (a << 8); \ 2409 c -= a; c -= b; c ^= (b >> 13); \ 2410 a -= b; a -= c; a ^= (c >> 12); \ 2411 b -= c; b -= a; b ^= (a << 16); \ 2412 c -= a; c -= b; c ^= (b >> 5); \ 2413 a -= b; a -= c; a ^= (c >> 3); \ 2414 b -= c; b -= a; b ^= (a << 10); \ 2415 c -= a; c -= b; c ^= (b >> 15); \ 2416 } while (0) 2417 2418/* 2419 * hash function based on bridge_hash in if_bridge.c 2420 */ 2421void 2422pf_hash(struct pf_addr *inaddr, struct pf_addr *hash, 2423 struct pf_poolhashkey *key, sa_family_t af) 2424{ 2425 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0]; 2426 2427 switch (af) { 2428#ifdef INET 2429 case AF_INET: 2430 a += inaddr->addr32[0]; 2431 b += key->key32[1]; 2432 mix(a, b, c); 2433 hash->addr32[0] = c + key->key32[2]; 2434 break; 2435#endif /* INET */ 2436#ifdef INET6 2437 case AF_INET6: 2438 a += inaddr->addr32[0]; 2439 b += inaddr->addr32[2]; 2440 mix(a, b, c); 2441 hash->addr32[0] = c; 2442 a += inaddr->addr32[1]; 2443 b += inaddr->addr32[3]; 2444 c += key->key32[1]; 2445 mix(a, b, c); 2446 hash->addr32[1] = c; 2447 a += inaddr->addr32[2]; 2448 b += inaddr->addr32[1]; 2449 c += key->key32[2]; 2450 mix(a, b, c); 2451 hash->addr32[2] = c; 2452 a += inaddr->addr32[3]; 2453 b += inaddr->addr32[0]; 2454 c += key->key32[3]; 2455 mix(a, b, c); 2456 hash->addr32[3] = c; 2457 break; 2458#endif /* INET6 */ 2459 } 2460} 2461 2462int 2463pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr, 2464 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn) 2465{ 2466 unsigned char hash[16]; 2467 struct pf_pool *rpool = &r->rpool; 2468 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr; 2469 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask; 2470 struct pf_pooladdr *acur = rpool->cur; 2471 struct pf_src_node k; 2472 2473 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR && 2474 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2475 k.af = af; 2476 PF_ACPY(&k.addr, saddr, af); 2477 if (r->rule_flag & PFRULE_RULESRCTRACK || 2478 r->rpool.opts & PF_POOL_STICKYADDR) 2479 k.rule.ptr = r; 2480 else 2481 k.rule.ptr = NULL; 2482 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++; 2483 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k); 2484 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) { 2485 PF_ACPY(naddr, &(*sn)->raddr, af); 2486 if (pf_status.debug >= PF_DEBUG_MISC) { 2487 printf("pf_map_addr: src tracking maps "); 2488 pf_print_host(&k.addr, 0, af); 2489 printf(" to "); 2490 pf_print_host(naddr, 0, af); 2491 printf("\n"); 2492 } 2493 return (0); 2494 } 2495 } 2496 2497 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) 2498 return (1); 2499 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2500 switch (af) { 2501#ifdef INET 2502 case AF_INET: 2503 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 && 2504 (rpool->opts & PF_POOL_TYPEMASK) != 2505 PF_POOL_ROUNDROBIN) 2506 return (1); 2507 raddr = &rpool->cur->addr.p.dyn->pfid_addr4; 2508 rmask = &rpool->cur->addr.p.dyn->pfid_mask4; 2509 break; 2510#endif /* INET */ 2511#ifdef INET6 2512 case AF_INET6: 2513 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 && 2514 (rpool->opts & PF_POOL_TYPEMASK) != 2515 PF_POOL_ROUNDROBIN) 2516 return (1); 2517 raddr = &rpool->cur->addr.p.dyn->pfid_addr6; 2518 rmask = &rpool->cur->addr.p.dyn->pfid_mask6; 2519 break; 2520#endif /* INET6 */ 2521 } 2522 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2523 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) 2524 return (1); /* unsupported */ 2525 } else { 2526 raddr = &rpool->cur->addr.v.a.addr; 2527 rmask = &rpool->cur->addr.v.a.mask; 2528 } 2529 2530 switch (rpool->opts & PF_POOL_TYPEMASK) { 2531 case PF_POOL_NONE: 2532 PF_ACPY(naddr, raddr, af); 2533 break; 2534 case PF_POOL_BITMASK: 2535 PF_POOLMASK(naddr, raddr, rmask, saddr, af); 2536 break; 2537 case PF_POOL_RANDOM: 2538 if (init_addr != NULL && PF_AZERO(init_addr, af)) { 2539 switch (af) { 2540#ifdef INET 2541 case AF_INET: 2542 rpool->counter.addr32[0] = htonl(arc4random()); 2543 break; 2544#endif /* INET */ 2545#ifdef INET6 2546 case AF_INET6: 2547 if (rmask->addr32[3] != 0xffffffff) 2548 rpool->counter.addr32[3] = 2549 htonl(arc4random()); 2550 else 2551 break; 2552 if (rmask->addr32[2] != 0xffffffff) 2553 rpool->counter.addr32[2] = 2554 htonl(arc4random()); 2555 else 2556 break; 2557 if (rmask->addr32[1] != 0xffffffff) 2558 rpool->counter.addr32[1] = 2559 htonl(arc4random()); 2560 else 2561 break; 2562 if (rmask->addr32[0] != 0xffffffff) 2563 rpool->counter.addr32[0] = 2564 htonl(arc4random()); 2565 break; 2566#endif /* INET6 */ 2567 } 2568 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2569 PF_ACPY(init_addr, naddr, af); 2570 2571 } else { 2572 PF_AINC(&rpool->counter, af); 2573 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af); 2574 } 2575 break; 2576 case PF_POOL_SRCHASH: 2577 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af); 2578 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af); 2579 break; 2580 case PF_POOL_ROUNDROBIN: 2581 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2582 if (!pfr_pool_get(rpool->cur->addr.p.tbl, 2583 &rpool->tblidx, &rpool->counter, 2584 &raddr, &rmask, af)) 2585 goto get_addr; 2586 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2587 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2588 &rpool->tblidx, &rpool->counter, 2589 &raddr, &rmask, af)) 2590 goto get_addr; 2591 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af)) 2592 goto get_addr; 2593 2594 try_next: 2595 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL) 2596 rpool->cur = TAILQ_FIRST(&rpool->list); 2597 if (rpool->cur->addr.type == PF_ADDR_TABLE) { 2598 rpool->tblidx = -1; 2599 if (pfr_pool_get(rpool->cur->addr.p.tbl, 2600 &rpool->tblidx, &rpool->counter, 2601 &raddr, &rmask, af)) { 2602 /* table contains no address of type 'af' */ 2603 if (rpool->cur != acur) 2604 goto try_next; 2605 return (1); 2606 } 2607 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) { 2608 rpool->tblidx = -1; 2609 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt, 2610 &rpool->tblidx, &rpool->counter, 2611 &raddr, &rmask, af)) { 2612 /* table contains no address of type 'af' */ 2613 if (rpool->cur != acur) 2614 goto try_next; 2615 return (1); 2616 } 2617 } else { 2618 raddr = &rpool->cur->addr.v.a.addr; 2619 rmask = &rpool->cur->addr.v.a.mask; 2620 PF_ACPY(&rpool->counter, raddr, af); 2621 } 2622 2623 get_addr: 2624 PF_ACPY(naddr, &rpool->counter, af); 2625 if (init_addr != NULL && PF_AZERO(init_addr, af)) 2626 PF_ACPY(init_addr, naddr, af); 2627 PF_AINC(&rpool->counter, af); 2628 break; 2629 } 2630 if (*sn != NULL) 2631 PF_ACPY(&(*sn)->raddr, naddr, af); 2632 2633 if (pf_status.debug >= PF_DEBUG_MISC && 2634 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) { 2635 printf("pf_map_addr: selected address "); 2636 pf_print_host(naddr, 0, af); 2637 printf("\n"); 2638 } 2639 2640 return (0); 2641} 2642 2643int 2644pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r, 2645 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport, 2646 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high, 2647 struct pf_src_node **sn) 2648{ 2649 struct pf_state_cmp key; 2650 struct pf_addr init_addr; 2651 u_int16_t cut; 2652 2653 bzero(&init_addr, sizeof(init_addr)); 2654 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2655 return (1); 2656 2657 if (proto == IPPROTO_ICMP) { 2658 low = 1; 2659 high = 65535; 2660 } 2661 2662 do { 2663 key.af = af; 2664 key.proto = proto; 2665 PF_ACPY(&key.ext.addr, daddr, key.af); 2666 PF_ACPY(&key.gwy.addr, naddr, key.af); 2667 key.ext.port = dport; 2668 2669 /* 2670 * port search; start random, step; 2671 * similar 2 portloop in in_pcbbind 2672 */ 2673 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP || 2674 proto == IPPROTO_ICMP)) { 2675 key.gwy.port = dport; 2676 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2677 return (0); 2678 } else if (low == 0 && high == 0) { 2679 key.gwy.port = *nport; 2680 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) 2681 return (0); 2682 } else if (low == high) { 2683 key.gwy.port = htons(low); 2684 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) { 2685 *nport = htons(low); 2686 return (0); 2687 } 2688 } else { 2689 u_int16_t tmp; 2690 2691 if (low > high) { 2692 tmp = low; 2693 low = high; 2694 high = tmp; 2695 } 2696 /* low < high */ 2697 cut = htonl(arc4random()) % (1 + high - low) + low; 2698 /* low <= cut <= high */ 2699 for (tmp = cut; tmp <= high; ++(tmp)) { 2700 key.gwy.port = htons(tmp); 2701 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2702 NULL) { 2703 *nport = htons(tmp); 2704 return (0); 2705 } 2706 } 2707 for (tmp = cut - 1; tmp >= low; --(tmp)) { 2708 key.gwy.port = htons(tmp); 2709 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == 2710 NULL) { 2711 *nport = htons(tmp); 2712 return (0); 2713 } 2714 } 2715 } 2716 2717 switch (r->rpool.opts & PF_POOL_TYPEMASK) { 2718 case PF_POOL_RANDOM: 2719 case PF_POOL_ROUNDROBIN: 2720 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn)) 2721 return (1); 2722 break; 2723 case PF_POOL_NONE: 2724 case PF_POOL_SRCHASH: 2725 case PF_POOL_BITMASK: 2726 default: 2727 return (1); 2728 } 2729 } while (! PF_AEQ(&init_addr, naddr, af) ); 2730 2731 return (1); /* none available */ 2732} 2733 2734struct pf_rule * 2735pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off, 2736 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport, 2737 struct pf_addr *daddr, u_int16_t dport, int rs_num) 2738{ 2739 struct pf_rule *r, *rm = NULL; 2740 struct pf_ruleset *ruleset = NULL; 2741 int tag = -1; 2742 int rtableid = -1; 2743 int asd = 0; 2744 2745 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr); 2746 while (r && rm == NULL) { 2747 struct pf_rule_addr *src = NULL, *dst = NULL; 2748 struct pf_addr_wrap *xdst = NULL; 2749 2750 if (r->action == PF_BINAT && direction == PF_IN) { 2751 src = &r->dst; 2752 if (r->rpool.cur != NULL) 2753 xdst = &r->rpool.cur->addr; 2754 } else { 2755 src = &r->src; 2756 dst = &r->dst; 2757 } 2758 2759 r->evaluations++; 2760 if (pfi_kif_match(r->kif, kif) == r->ifnot) 2761 r = r->skip[PF_SKIP_IFP].ptr; 2762 else if (r->direction && r->direction != direction) 2763 r = r->skip[PF_SKIP_DIR].ptr; 2764 else if (r->af && r->af != pd->af) 2765 r = r->skip[PF_SKIP_AF].ptr; 2766 else if (r->proto && r->proto != pd->proto) 2767 r = r->skip[PF_SKIP_PROTO].ptr; 2768 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, 2769 src->neg, kif)) 2770 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR : 2771 PF_SKIP_DST_ADDR].ptr; 2772 else if (src->port_op && !pf_match_port(src->port_op, 2773 src->port[0], src->port[1], sport)) 2774 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT : 2775 PF_SKIP_DST_PORT].ptr; 2776 else if (dst != NULL && 2777 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL)) 2778 r = r->skip[PF_SKIP_DST_ADDR].ptr; 2779 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 2780 0, NULL)) 2781 r = TAILQ_NEXT(r, entries); 2782 else if (dst != NULL && dst->port_op && 2783 !pf_match_port(dst->port_op, dst->port[0], 2784 dst->port[1], dport)) 2785 r = r->skip[PF_SKIP_DST_PORT].ptr; 2786 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 2787 r = TAILQ_NEXT(r, entries); 2788 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto != 2789 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m, 2790 off, pd->hdr.tcp), r->os_fingerprint))) 2791 r = TAILQ_NEXT(r, entries); 2792 else { 2793 if (r->tag) 2794 tag = r->tag; 2795 if (r->rtableid >= 0) 2796 rtableid = r->rtableid; 2797 if (r->anchor == NULL) { 2798 rm = r; 2799 } else 2800 pf_step_into_anchor(&asd, &ruleset, rs_num, 2801 &r, NULL, NULL); 2802 } 2803 if (r == NULL) 2804 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r, 2805 NULL, NULL); 2806 } 2807 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) 2808 return (NULL); 2809 if (rm != NULL && (rm->action == PF_NONAT || 2810 rm->action == PF_NORDR || rm->action == PF_NOBINAT)) 2811 return (NULL); 2812 return (rm); 2813} 2814 2815struct pf_rule * 2816pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction, 2817 struct pfi_kif *kif, struct pf_src_node **sn, 2818 struct pf_addr *saddr, u_int16_t sport, 2819 struct pf_addr *daddr, u_int16_t dport, 2820 struct pf_addr *naddr, u_int16_t *nport) 2821{ 2822 struct pf_rule *r = NULL; 2823 2824 if (direction == PF_OUT) { 2825 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2826 sport, daddr, dport, PF_RULESET_BINAT); 2827 if (r == NULL) 2828 r = pf_match_translation(pd, m, off, direction, kif, 2829 saddr, sport, daddr, dport, PF_RULESET_NAT); 2830 } else { 2831 r = pf_match_translation(pd, m, off, direction, kif, saddr, 2832 sport, daddr, dport, PF_RULESET_RDR); 2833 if (r == NULL) 2834 r = pf_match_translation(pd, m, off, direction, kif, 2835 saddr, sport, daddr, dport, PF_RULESET_BINAT); 2836 } 2837 2838 if (r != NULL) { 2839 switch (r->action) { 2840 case PF_NONAT: 2841 case PF_NOBINAT: 2842 case PF_NORDR: 2843 return (NULL); 2844 case PF_NAT: 2845 if (pf_get_sport(pd->af, pd->proto, r, saddr, 2846 daddr, dport, naddr, nport, r->rpool.proxy_port[0], 2847 r->rpool.proxy_port[1], sn)) { 2848 DPFPRINTF(PF_DEBUG_MISC, 2849 ("pf: NAT proxy port allocation " 2850 "(%u-%u) failed\n", 2851 r->rpool.proxy_port[0], 2852 r->rpool.proxy_port[1])); 2853 return (NULL); 2854 } 2855 break; 2856 case PF_BINAT: 2857 switch (direction) { 2858 case PF_OUT: 2859 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){ 2860 switch (pd->af) { 2861#ifdef INET 2862 case AF_INET: 2863 if (r->rpool.cur->addr.p.dyn-> 2864 pfid_acnt4 < 1) 2865 return (NULL); 2866 PF_POOLMASK(naddr, 2867 &r->rpool.cur->addr.p.dyn-> 2868 pfid_addr4, 2869 &r->rpool.cur->addr.p.dyn-> 2870 pfid_mask4, 2871 saddr, AF_INET); 2872 break; 2873#endif /* INET */ 2874#ifdef INET6 2875 case AF_INET6: 2876 if (r->rpool.cur->addr.p.dyn-> 2877 pfid_acnt6 < 1) 2878 return (NULL); 2879 PF_POOLMASK(naddr, 2880 &r->rpool.cur->addr.p.dyn-> 2881 pfid_addr6, 2882 &r->rpool.cur->addr.p.dyn-> 2883 pfid_mask6, 2884 saddr, AF_INET6); 2885 break; 2886#endif /* INET6 */ 2887 } 2888 } else 2889 PF_POOLMASK(naddr, 2890 &r->rpool.cur->addr.v.a.addr, 2891 &r->rpool.cur->addr.v.a.mask, 2892 saddr, pd->af); 2893 break; 2894 case PF_IN: 2895 if (r->src.addr.type == PF_ADDR_DYNIFTL) { 2896 switch (pd->af) { 2897#ifdef INET 2898 case AF_INET: 2899 if (r->src.addr.p.dyn-> 2900 pfid_acnt4 < 1) 2901 return (NULL); 2902 PF_POOLMASK(naddr, 2903 &r->src.addr.p.dyn-> 2904 pfid_addr4, 2905 &r->src.addr.p.dyn-> 2906 pfid_mask4, 2907 daddr, AF_INET); 2908 break; 2909#endif /* INET */ 2910#ifdef INET6 2911 case AF_INET6: 2912 if (r->src.addr.p.dyn-> 2913 pfid_acnt6 < 1) 2914 return (NULL); 2915 PF_POOLMASK(naddr, 2916 &r->src.addr.p.dyn-> 2917 pfid_addr6, 2918 &r->src.addr.p.dyn-> 2919 pfid_mask6, 2920 daddr, AF_INET6); 2921 break; 2922#endif /* INET6 */ 2923 } 2924 } else 2925 PF_POOLMASK(naddr, 2926 &r->src.addr.v.a.addr, 2927 &r->src.addr.v.a.mask, daddr, 2928 pd->af); 2929 break; 2930 } 2931 break; 2932 case PF_RDR: { 2933 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn)) 2934 return (NULL); 2935 if ((r->rpool.opts & PF_POOL_TYPEMASK) == 2936 PF_POOL_BITMASK) 2937 PF_POOLMASK(naddr, naddr, 2938 &r->rpool.cur->addr.v.a.mask, daddr, 2939 pd->af); 2940 2941 if (r->rpool.proxy_port[1]) { 2942 u_int32_t tmp_nport; 2943 2944 tmp_nport = ((ntohs(dport) - 2945 ntohs(r->dst.port[0])) % 2946 (r->rpool.proxy_port[1] - 2947 r->rpool.proxy_port[0] + 1)) + 2948 r->rpool.proxy_port[0]; 2949 2950 /* wrap around if necessary */ 2951 if (tmp_nport > 65535) 2952 tmp_nport -= 65535; 2953 *nport = htons((u_int16_t)tmp_nport); 2954 } else if (r->rpool.proxy_port[0]) 2955 *nport = htons(r->rpool.proxy_port[0]); 2956 break; 2957 } 2958 default: 2959 return (NULL); 2960 } 2961 } 2962 2963 return (r); 2964} 2965 2966int 2967#ifdef __FreeBSD__ 2968pf_socket_lookup(int direction, struct pf_pdesc *pd, struct inpcb *inp_arg) 2969#else 2970pf_socket_lookup(int direction, struct pf_pdesc *pd) 2971#endif 2972{ 2973 struct pf_addr *saddr, *daddr; 2974 u_int16_t sport, dport; 2975#ifdef __FreeBSD__ 2976 struct inpcbinfo *pi; 2977#else 2978 struct inpcbtable *tb; 2979#endif 2980 struct inpcb *inp; 2981 2982 if (pd == NULL) 2983 return (-1); 2984 pd->lookup.uid = UID_MAX; 2985 pd->lookup.gid = GID_MAX; 2986 pd->lookup.pid = NO_PID; /* XXX: revisit */ 2987#ifdef __FreeBSD__ 2988 if (inp_arg != NULL) { 2989 INP_LOCK_ASSERT(inp_arg); 2990 pd->lookup.uid = inp_arg->inp_cred->cr_uid; 2991 pd->lookup.gid = inp_arg->inp_cred->cr_groups[0]; 2992 return (1); 2993 } 2994#endif 2995 switch (pd->proto) { 2996 case IPPROTO_TCP: 2997 if (pd->hdr.tcp == NULL) 2998 return (-1); 2999 sport = pd->hdr.tcp->th_sport; 3000 dport = pd->hdr.tcp->th_dport; 3001#ifdef __FreeBSD__ 3002 pi = &V_tcbinfo; 3003#else 3004 tb = &tcbtable; 3005#endif 3006 break; 3007 case IPPROTO_UDP: 3008 if (pd->hdr.udp == NULL) 3009 return (-1); 3010 sport = pd->hdr.udp->uh_sport; 3011 dport = pd->hdr.udp->uh_dport; 3012#ifdef __FreeBSD__ 3013 pi = &V_udbinfo; 3014#else 3015 tb = &udbtable; 3016#endif 3017 break; 3018 default: 3019 return (-1); 3020 } 3021 if (direction == PF_IN) { 3022 saddr = pd->src; 3023 daddr = pd->dst; 3024 } else { 3025 u_int16_t p; 3026 3027 p = sport; 3028 sport = dport; 3029 dport = p; 3030 saddr = pd->dst; 3031 daddr = pd->src; 3032 } 3033 switch (pd->af) { 3034#ifdef INET 3035 case AF_INET: 3036#ifdef __FreeBSD__ 3037 inp = in_pcblookup(pi, saddr->v4, sport, daddr->v4, 3038 dport, INPLOOKUP_RLOCKPCB, NULL); 3039 if (inp == NULL) { 3040 inp = in_pcblookup(pi, saddr->v4, sport, 3041 daddr->v4, dport, INPLOOKUP_WILDCARD | 3042 INPLOOKUP_RLOCKPCB, NULL); 3043 if (inp == NULL) 3044 return (-1); 3045 } 3046#else 3047 inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport); 3048 if (inp == NULL) { 3049 inp = in_pcblookup_listen(tb, daddr->v4, dport, 0); 3050 if (inp == NULL) 3051 return (-1); 3052 } 3053#endif 3054 break; 3055#endif /* INET */ 3056#ifdef INET6 3057 case AF_INET6: 3058#ifdef __FreeBSD__ 3059 inp = in6_pcblookup(pi, &saddr->v6, sport, 3060 &daddr->v6, dport, INPLOOKUP_RLOCKPCB, NULL); 3061 if (inp == NULL) { 3062 inp = in6_pcblookup(pi, &saddr->v6, sport, 3063 &daddr->v6, dport, INPLOOKUP_WILDCARD | 3064 INPLOOKUP_RLOCKPCB, NULL); 3065 if (inp == NULL) 3066 return (-1); 3067 } 3068#else 3069 inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6, 3070 dport); 3071 if (inp == NULL) { 3072 inp = in6_pcblookup_listen(tb, &daddr->v6, dport, 0); 3073 if (inp == NULL) 3074 return (-1); 3075 } 3076#endif 3077 break; 3078#endif /* INET6 */ 3079 3080 default: 3081 return (-1); 3082 } 3083#ifdef __FreeBSD__ 3084 INP_RLOCK_ASSERT(inp); 3085 pd->lookup.uid = inp->inp_cred->cr_uid; 3086 pd->lookup.gid = inp->inp_cred->cr_groups[0]; 3087 INP_RUNLOCK(inp); 3088#else 3089 pd->lookup.uid = inp->inp_socket->so_euid; 3090 pd->lookup.gid = inp->inp_socket->so_egid; 3091 pd->lookup.pid = inp->inp_socket->so_cpid; 3092#endif 3093 return (1); 3094} 3095 3096u_int8_t 3097pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3098{ 3099 int hlen; 3100 u_int8_t hdr[60]; 3101 u_int8_t *opt, optlen; 3102 u_int8_t wscale = 0; 3103 3104 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3105 if (hlen <= sizeof(struct tcphdr)) 3106 return (0); 3107 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3108 return (0); 3109 opt = hdr + sizeof(struct tcphdr); 3110 hlen -= sizeof(struct tcphdr); 3111 while (hlen >= 3) { 3112 switch (*opt) { 3113 case TCPOPT_EOL: 3114 case TCPOPT_NOP: 3115 ++opt; 3116 --hlen; 3117 break; 3118 case TCPOPT_WINDOW: 3119 wscale = opt[2]; 3120 if (wscale > TCP_MAX_WINSHIFT) 3121 wscale = TCP_MAX_WINSHIFT; 3122 wscale |= PF_WSCALE_FLAG; 3123 /* FALLTHROUGH */ 3124 default: 3125 optlen = opt[1]; 3126 if (optlen < 2) 3127 optlen = 2; 3128 hlen -= optlen; 3129 opt += optlen; 3130 break; 3131 } 3132 } 3133 return (wscale); 3134} 3135 3136u_int16_t 3137pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af) 3138{ 3139 int hlen; 3140 u_int8_t hdr[60]; 3141 u_int8_t *opt, optlen; 3142 u_int16_t mss = V_tcp_mssdflt; 3143 3144 hlen = th_off << 2; /* hlen <= sizeof(hdr) */ 3145 if (hlen <= sizeof(struct tcphdr)) 3146 return (0); 3147 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af)) 3148 return (0); 3149 opt = hdr + sizeof(struct tcphdr); 3150 hlen -= sizeof(struct tcphdr); 3151 while (hlen >= TCPOLEN_MAXSEG) { 3152 switch (*opt) { 3153 case TCPOPT_EOL: 3154 case TCPOPT_NOP: 3155 ++opt; 3156 --hlen; 3157 break; 3158 case TCPOPT_MAXSEG: 3159 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2); 3160 NTOHS(mss); 3161 /* FALLTHROUGH */ 3162 default: 3163 optlen = opt[1]; 3164 if (optlen < 2) 3165 optlen = 2; 3166 hlen -= optlen; 3167 opt += optlen; 3168 break; 3169 } 3170 } 3171 return (mss); 3172} 3173 3174u_int16_t 3175pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer) 3176{ 3177#ifdef INET 3178 struct sockaddr_in *dst; 3179 struct route ro; 3180#endif /* INET */ 3181#ifdef INET6 3182 struct sockaddr_in6 *dst6; 3183 struct route_in6 ro6; 3184#endif /* INET6 */ 3185 struct rtentry *rt = NULL; 3186 int hlen = 0; /* make the compiler happy */ 3187 u_int16_t mss = V_tcp_mssdflt; 3188 3189 switch (af) { 3190#ifdef INET 3191 case AF_INET: 3192 hlen = sizeof(struct ip); 3193 bzero(&ro, sizeof(ro)); 3194 dst = (struct sockaddr_in *)&ro.ro_dst; 3195 dst->sin_family = AF_INET; 3196 dst->sin_len = sizeof(*dst); 3197 dst->sin_addr = addr->v4; 3198#ifdef __FreeBSD__ 3199#ifdef RTF_PRCLONING 3200 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING)); 3201#else /* !RTF_PRCLONING */ 3202 in_rtalloc_ign(&ro, 0, 0); 3203#endif 3204#else /* ! __FreeBSD__ */ 3205 rtalloc_noclone(&ro, NO_CLONING); 3206#endif 3207 rt = ro.ro_rt; 3208 break; 3209#endif /* INET */ 3210#ifdef INET6 3211 case AF_INET6: 3212 hlen = sizeof(struct ip6_hdr); 3213 bzero(&ro6, sizeof(ro6)); 3214 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst; 3215 dst6->sin6_family = AF_INET6; 3216 dst6->sin6_len = sizeof(*dst6); 3217 dst6->sin6_addr = addr->v6; 3218#ifdef __FreeBSD__ 3219#ifdef RTF_PRCLONING 3220 rtalloc_ign((struct route *)&ro6, 3221 (RTF_CLONING | RTF_PRCLONING)); 3222#else /* !RTF_PRCLONING */ 3223 rtalloc_ign((struct route *)&ro6, 0); 3224#endif 3225#else /* ! __FreeBSD__ */ 3226 rtalloc_noclone((struct route *)&ro6, NO_CLONING); 3227#endif 3228 rt = ro6.ro_rt; 3229 break; 3230#endif /* INET6 */ 3231 } 3232 3233 if (rt && rt->rt_ifp) { 3234 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr); 3235 mss = max(V_tcp_mssdflt, mss); 3236 RTFREE(rt); 3237 } 3238 mss = min(mss, offer); 3239 mss = max(mss, 64); /* sanity - at least max opt space */ 3240 return (mss); 3241} 3242 3243void 3244pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr) 3245{ 3246 struct pf_rule *r = s->rule.ptr; 3247 3248 s->rt_kif = NULL; 3249 if (!r->rt || r->rt == PF_FASTROUTE) 3250 return; 3251 switch (s->af) { 3252#ifdef INET 3253 case AF_INET: 3254 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, 3255 &s->nat_src_node); 3256 s->rt_kif = r->rpool.cur->kif; 3257 break; 3258#endif /* INET */ 3259#ifdef INET6 3260 case AF_INET6: 3261 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, 3262 &s->nat_src_node); 3263 s->rt_kif = r->rpool.cur->kif; 3264 break; 3265#endif /* INET6 */ 3266 } 3267} 3268 3269int 3270pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction, 3271 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3272#ifdef __FreeBSD__ 3273 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3274 struct ifqueue *ifq, struct inpcb *inp) 3275#else 3276 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3277 struct ifqueue *ifq) 3278#endif 3279{ 3280 struct pf_rule *nr = NULL; 3281 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3282 struct tcphdr *th = pd->hdr.tcp; 3283 u_int16_t bport, nport = 0; 3284 sa_family_t af = pd->af; 3285 struct pf_rule *r, *a = NULL; 3286 struct pf_ruleset *ruleset = NULL; 3287 struct pf_src_node *nsn = NULL; 3288 u_short reason; 3289 int rewrite = 0; 3290 int tag = -1, rtableid = -1; 3291 u_int16_t mss = V_tcp_mssdflt; 3292 int asd = 0; 3293 int match = 0; 3294 3295 if (pf_check_congestion(ifq)) { 3296 REASON_SET(&reason, PFRES_CONGEST); 3297 return (PF_DROP); 3298 } 3299 3300#ifdef __FreeBSD__ 3301 if (inp != NULL) 3302 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3303 else if (debug_pfugidhack) { 3304 PF_UNLOCK(); 3305 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3306 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3307 PF_LOCK(); 3308 } 3309#endif 3310 3311 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3312 3313 if (direction == PF_OUT) { 3314 bport = nport = th->th_sport; 3315 /* check outgoing packet for BINAT/NAT */ 3316 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3317 saddr, th->th_sport, daddr, th->th_dport, 3318 &pd->naddr, &nport)) != NULL) { 3319 PF_ACPY(&pd->baddr, saddr, af); 3320 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3321 &th->th_sum, &pd->naddr, nport, 0, af); 3322 rewrite++; 3323 if (nr->natpass) 3324 r = NULL; 3325 pd->nat_rule = nr; 3326 } 3327 } else { 3328 bport = nport = th->th_dport; 3329 /* check incoming packet for BINAT/RDR */ 3330 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3331 saddr, th->th_sport, daddr, th->th_dport, 3332 &pd->naddr, &nport)) != NULL) { 3333 PF_ACPY(&pd->baddr, daddr, af); 3334 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3335 &th->th_sum, &pd->naddr, nport, 0, af); 3336 rewrite++; 3337 if (nr->natpass) 3338 r = NULL; 3339 pd->nat_rule = nr; 3340 } 3341 } 3342 3343 while (r != NULL) { 3344 r->evaluations++; 3345 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3346 r = r->skip[PF_SKIP_IFP].ptr; 3347 else if (r->direction && r->direction != direction) 3348 r = r->skip[PF_SKIP_DIR].ptr; 3349 else if (r->af && r->af != af) 3350 r = r->skip[PF_SKIP_AF].ptr; 3351 else if (r->proto && r->proto != IPPROTO_TCP) 3352 r = r->skip[PF_SKIP_PROTO].ptr; 3353 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3354 r->src.neg, kif)) 3355 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3356 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3357 r->src.port[0], r->src.port[1], th->th_sport)) 3358 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3359 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3360 r->dst.neg, NULL)) 3361 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3362 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3363 r->dst.port[0], r->dst.port[1], th->th_dport)) 3364 r = r->skip[PF_SKIP_DST_PORT].ptr; 3365 else if (r->tos && !(r->tos == pd->tos)) 3366 r = TAILQ_NEXT(r, entries); 3367 else if (r->rule_flag & PFRULE_FRAGMENT) 3368 r = TAILQ_NEXT(r, entries); 3369 else if ((r->flagset & th->th_flags) != r->flags) 3370 r = TAILQ_NEXT(r, entries); 3371 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3372#ifdef __FreeBSD__ 3373 pf_socket_lookup(direction, pd, inp), 1)) && 3374#else 3375 pf_socket_lookup(direction, pd), 1)) && 3376#endif 3377 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3378 pd->lookup.uid)) 3379 r = TAILQ_NEXT(r, entries); 3380 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3381#ifdef __FreeBSD__ 3382 pf_socket_lookup(direction, pd, inp), 1)) && 3383#else 3384 pf_socket_lookup(direction, pd), 1)) && 3385#endif 3386 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3387 pd->lookup.gid)) 3388 r = TAILQ_NEXT(r, entries); 3389 else if (r->prob && r->prob <= arc4random()) 3390 r = TAILQ_NEXT(r, entries); 3391 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3392 r = TAILQ_NEXT(r, entries); 3393 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match( 3394 pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint)) 3395 r = TAILQ_NEXT(r, entries); 3396 else { 3397 if (r->tag) 3398 tag = r->tag; 3399 if (r->rtableid >= 0) 3400 rtableid = r->rtableid; 3401 if (r->anchor == NULL) { 3402 match = 1; 3403 *rm = r; 3404 *am = a; 3405 *rsm = ruleset; 3406 if ((*rm)->quick) 3407 break; 3408 r = TAILQ_NEXT(r, entries); 3409 } else 3410 pf_step_into_anchor(&asd, &ruleset, 3411 PF_RULESET_FILTER, &r, &a, &match); 3412 } 3413 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3414 PF_RULESET_FILTER, &r, &a, &match)) 3415 break; 3416 } 3417 r = *rm; 3418 a = *am; 3419 ruleset = *rsm; 3420 3421 REASON_SET(&reason, PFRES_MATCH); 3422 3423 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3424 if (rewrite) 3425#ifdef __FreeBSD__ 3426 m_copyback(m, off, sizeof(*th), (caddr_t)th); 3427#else 3428 m_copyback(m, off, sizeof(*th), th); 3429#endif 3430 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3431 a, ruleset, pd); 3432 } 3433 3434 if ((r->action == PF_DROP) && 3435 ((r->rule_flag & PFRULE_RETURNRST) || 3436 (r->rule_flag & PFRULE_RETURNICMP) || 3437 (r->rule_flag & PFRULE_RETURN))) { 3438 /* undo NAT changes, if they have taken place */ 3439 if (nr != NULL) { 3440 if (direction == PF_OUT) { 3441 pf_change_ap(saddr, &th->th_sport, pd->ip_sum, 3442 &th->th_sum, &pd->baddr, bport, 0, af); 3443 rewrite++; 3444 } else { 3445 pf_change_ap(daddr, &th->th_dport, pd->ip_sum, 3446 &th->th_sum, &pd->baddr, bport, 0, af); 3447 rewrite++; 3448 } 3449 } 3450 if (((r->rule_flag & PFRULE_RETURNRST) || 3451 (r->rule_flag & PFRULE_RETURN)) && 3452 !(th->th_flags & TH_RST)) { 3453 u_int32_t ack = ntohl(th->th_seq) + pd->p_len; 3454 3455 if (th->th_flags & TH_SYN) 3456 ack++; 3457 if (th->th_flags & TH_FIN) 3458 ack++; 3459#ifdef __FreeBSD__ 3460 pf_send_tcp(m, r, af, pd->dst, 3461#else 3462 pf_send_tcp(r, af, pd->dst, 3463#endif 3464 pd->src, th->th_dport, th->th_sport, 3465 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0, 3466 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp); 3467 } else if ((af == AF_INET) && r->return_icmp) 3468 pf_send_icmp(m, r->return_icmp >> 8, 3469 r->return_icmp & 255, af, r); 3470 else if ((af == AF_INET6) && r->return_icmp6) 3471 pf_send_icmp(m, r->return_icmp6 >> 8, 3472 r->return_icmp6 & 255, af, r); 3473 } 3474 3475 if (r->action == PF_DROP) 3476 return (PF_DROP); 3477 3478 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3479 REASON_SET(&reason, PFRES_MEMORY); 3480 return (PF_DROP); 3481 } 3482 3483 if (r->keep_state || nr != NULL || 3484 (pd->flags & PFDESC_TCP_NORM)) { 3485 /* create new state */ 3486 u_int16_t len; 3487 struct pf_state *s = NULL; 3488 struct pf_src_node *sn = NULL; 3489 3490 len = pd->tot_len - off - (th->th_off << 2); 3491 3492 /* check maximums */ 3493 if (r->max_states && (r->states >= r->max_states)) { 3494 pf_status.lcounters[LCNT_STATES]++; 3495 REASON_SET(&reason, PFRES_MAXSTATES); 3496 goto cleanup; 3497 } 3498 /* src node for filter rule */ 3499 if ((r->rule_flag & PFRULE_SRCTRACK || 3500 r->rpool.opts & PF_POOL_STICKYADDR) && 3501 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3502 REASON_SET(&reason, PFRES_SRCLIMIT); 3503 goto cleanup; 3504 } 3505 /* src node for translation rule */ 3506 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3507 ((direction == PF_OUT && 3508 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3509 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3510 REASON_SET(&reason, PFRES_SRCLIMIT); 3511 goto cleanup; 3512 } 3513 s = pool_get(&pf_state_pl, PR_NOWAIT); 3514 if (s == NULL) { 3515 REASON_SET(&reason, PFRES_MEMORY); 3516cleanup: 3517 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3518 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3519 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3520 pf_status.src_nodes--; 3521 pool_put(&pf_src_tree_pl, sn); 3522 } 3523 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3524 nsn->expire == 0) { 3525 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3526 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3527 pf_status.src_nodes--; 3528 pool_put(&pf_src_tree_pl, nsn); 3529 } 3530 return (PF_DROP); 3531 } 3532 bzero(s, sizeof(*s)); 3533 s->rule.ptr = r; 3534 s->nat_rule.ptr = nr; 3535 s->anchor.ptr = a; 3536 STATE_INC_COUNTERS(s); 3537 if (r->allow_opts) 3538 s->state_flags |= PFSTATE_ALLOWOPTS; 3539 if (r->rule_flag & PFRULE_STATESLOPPY) 3540 s->state_flags |= PFSTATE_SLOPPY; 3541 s->log = r->log & PF_LOG_ALL; 3542 if (nr != NULL) 3543 s->log |= nr->log & PF_LOG_ALL; 3544 s->proto = IPPROTO_TCP; 3545 s->direction = direction; 3546 s->af = af; 3547 if (direction == PF_OUT) { 3548 PF_ACPY(&s->gwy.addr, saddr, af); 3549 s->gwy.port = th->th_sport; /* sport */ 3550 PF_ACPY(&s->ext.addr, daddr, af); 3551 s->ext.port = th->th_dport; 3552 if (nr != NULL) { 3553 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3554 s->lan.port = bport; 3555 } else { 3556 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3557 s->lan.port = s->gwy.port; 3558 } 3559 } else { 3560 PF_ACPY(&s->lan.addr, daddr, af); 3561 s->lan.port = th->th_dport; 3562 PF_ACPY(&s->ext.addr, saddr, af); 3563 s->ext.port = th->th_sport; 3564 if (nr != NULL) { 3565 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3566 s->gwy.port = bport; 3567 } else { 3568 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3569 s->gwy.port = s->lan.port; 3570 } 3571 } 3572 3573 s->src.seqlo = ntohl(th->th_seq); 3574 s->src.seqhi = s->src.seqlo + len + 1; 3575 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3576 r->keep_state == PF_STATE_MODULATE) { 3577 /* Generate sequence number modulator */ 3578#ifdef __FreeBSD__ 3579 while ((s->src.seqdiff = 3580 pf_new_isn(s) - s->src.seqlo) == 0) 3581 ; 3582#else 3583 while ((s->src.seqdiff = 3584 tcp_rndiss_next() - s->src.seqlo) == 0) 3585 ; 3586#endif 3587 pf_change_a(&th->th_seq, &th->th_sum, 3588 htonl(s->src.seqlo + s->src.seqdiff), 0); 3589 rewrite = 1; 3590 } else 3591 s->src.seqdiff = 0; 3592 if (th->th_flags & TH_SYN) { 3593 s->src.seqhi++; 3594 s->src.wscale = pf_get_wscale(m, off, th->th_off, af); 3595 } 3596 s->src.max_win = MAX(ntohs(th->th_win), 1); 3597 if (s->src.wscale & PF_WSCALE_MASK) { 3598 /* Remove scale factor from initial window */ 3599 int win = s->src.max_win; 3600 win += 1 << (s->src.wscale & PF_WSCALE_MASK); 3601 s->src.max_win = (win - 1) >> 3602 (s->src.wscale & PF_WSCALE_MASK); 3603 } 3604 if (th->th_flags & TH_FIN) 3605 s->src.seqhi++; 3606 s->dst.seqhi = 1; 3607 s->dst.max_win = 1; 3608 s->src.state = TCPS_SYN_SENT; 3609 s->dst.state = TCPS_CLOSED; 3610 s->creation = time_second; 3611 s->expire = time_second; 3612 s->timeout = PFTM_TCP_FIRST_PACKET; 3613 pf_set_rt_ifp(s, saddr); 3614 if (sn != NULL) { 3615 s->src_node = sn; 3616 s->src_node->states++; 3617 } 3618 if (nsn != NULL) { 3619 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3620 s->nat_src_node = nsn; 3621 s->nat_src_node->states++; 3622 } 3623 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m, 3624 off, pd, th, &s->src, &s->dst)) { 3625 REASON_SET(&reason, PFRES_MEMORY); 3626 pf_src_tree_remove_state(s); 3627 STATE_DEC_COUNTERS(s); 3628 pool_put(&pf_state_pl, s); 3629 return (PF_DROP); 3630 } 3631 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub && 3632 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s, 3633 &s->src, &s->dst, &rewrite)) { 3634 /* This really shouldn't happen!!! */ 3635 DPFPRINTF(PF_DEBUG_URGENT, 3636 ("pf_normalize_tcp_stateful failed on first pkt")); 3637 pf_normalize_tcp_cleanup(s); 3638 pf_src_tree_remove_state(s); 3639 STATE_DEC_COUNTERS(s); 3640 pool_put(&pf_state_pl, s); 3641 return (PF_DROP); 3642 } 3643 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3644 pf_normalize_tcp_cleanup(s); 3645 REASON_SET(&reason, PFRES_STATEINS); 3646 pf_src_tree_remove_state(s); 3647 STATE_DEC_COUNTERS(s); 3648 pool_put(&pf_state_pl, s); 3649 return (PF_DROP); 3650 } else 3651 *sm = s; 3652 if (tag > 0) { 3653 pf_tag_ref(tag); 3654 s->tag = tag; 3655 } 3656 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN && 3657 r->keep_state == PF_STATE_SYNPROXY) { 3658 s->src.state = PF_TCPS_PROXY_SRC; 3659 if (nr != NULL) { 3660 if (direction == PF_OUT) { 3661 pf_change_ap(saddr, &th->th_sport, 3662 pd->ip_sum, &th->th_sum, &pd->baddr, 3663 bport, 0, af); 3664 } else { 3665 pf_change_ap(daddr, &th->th_dport, 3666 pd->ip_sum, &th->th_sum, &pd->baddr, 3667 bport, 0, af); 3668 } 3669 } 3670 s->src.seqhi = htonl(arc4random()); 3671 /* Find mss option */ 3672 mss = pf_get_mss(m, off, th->th_off, af); 3673 mss = pf_calc_mss(saddr, af, mss); 3674 mss = pf_calc_mss(daddr, af, mss); 3675 s->src.mss = mss; 3676#ifdef __FreeBSD__ 3677 pf_send_tcp(NULL, r, af, daddr, saddr, th->th_dport, 3678#else 3679 pf_send_tcp(r, af, daddr, saddr, th->th_dport, 3680#endif 3681 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1, 3682 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL); 3683 REASON_SET(&reason, PFRES_SYNPROXY); 3684 return (PF_SYNPROXY_DROP); 3685 } 3686 } 3687 3688 /* copy back packet headers if we performed NAT operations */ 3689 if (rewrite) 3690 m_copyback(m, off, sizeof(*th), (caddr_t)th); 3691 3692 return (PF_PASS); 3693} 3694 3695int 3696pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction, 3697 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 3698#ifdef __FreeBSD__ 3699 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3700 struct ifqueue *ifq, struct inpcb *inp) 3701#else 3702 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 3703 struct ifqueue *ifq) 3704#endif 3705{ 3706 struct pf_rule *nr = NULL; 3707 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 3708 struct udphdr *uh = pd->hdr.udp; 3709 u_int16_t bport, nport = 0; 3710 sa_family_t af = pd->af; 3711 struct pf_rule *r, *a = NULL; 3712 struct pf_ruleset *ruleset = NULL; 3713 struct pf_src_node *nsn = NULL; 3714 u_short reason; 3715 int rewrite = 0; 3716 int tag = -1, rtableid = -1; 3717 int asd = 0; 3718 int match = 0; 3719 3720 if (pf_check_congestion(ifq)) { 3721 REASON_SET(&reason, PFRES_CONGEST); 3722 return (PF_DROP); 3723 } 3724 3725#ifdef __FreeBSD__ 3726 if (inp != NULL) 3727 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3728 else if (debug_pfugidhack) { 3729 PF_UNLOCK(); 3730 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n")); 3731 pd->lookup.done = pf_socket_lookup(direction, pd, inp); 3732 PF_LOCK(); 3733 } 3734#endif 3735 3736 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 3737 3738 if (direction == PF_OUT) { 3739 bport = nport = uh->uh_sport; 3740 /* check outgoing packet for BINAT/NAT */ 3741 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 3742 saddr, uh->uh_sport, daddr, uh->uh_dport, 3743 &pd->naddr, &nport)) != NULL) { 3744 PF_ACPY(&pd->baddr, saddr, af); 3745 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3746 &uh->uh_sum, &pd->naddr, nport, 1, af); 3747 rewrite++; 3748 if (nr->natpass) 3749 r = NULL; 3750 pd->nat_rule = nr; 3751 } 3752 } else { 3753 bport = nport = uh->uh_dport; 3754 /* check incoming packet for BINAT/RDR */ 3755 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 3756 saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr, 3757 &nport)) != NULL) { 3758 PF_ACPY(&pd->baddr, daddr, af); 3759 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3760 &uh->uh_sum, &pd->naddr, nport, 1, af); 3761 rewrite++; 3762 if (nr->natpass) 3763 r = NULL; 3764 pd->nat_rule = nr; 3765 } 3766 } 3767 3768 while (r != NULL) { 3769 r->evaluations++; 3770 if (pfi_kif_match(r->kif, kif) == r->ifnot) 3771 r = r->skip[PF_SKIP_IFP].ptr; 3772 else if (r->direction && r->direction != direction) 3773 r = r->skip[PF_SKIP_DIR].ptr; 3774 else if (r->af && r->af != af) 3775 r = r->skip[PF_SKIP_AF].ptr; 3776 else if (r->proto && r->proto != IPPROTO_UDP) 3777 r = r->skip[PF_SKIP_PROTO].ptr; 3778 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 3779 r->src.neg, kif)) 3780 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 3781 else if (r->src.port_op && !pf_match_port(r->src.port_op, 3782 r->src.port[0], r->src.port[1], uh->uh_sport)) 3783 r = r->skip[PF_SKIP_SRC_PORT].ptr; 3784 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 3785 r->dst.neg, NULL)) 3786 r = r->skip[PF_SKIP_DST_ADDR].ptr; 3787 else if (r->dst.port_op && !pf_match_port(r->dst.port_op, 3788 r->dst.port[0], r->dst.port[1], uh->uh_dport)) 3789 r = r->skip[PF_SKIP_DST_PORT].ptr; 3790 else if (r->tos && !(r->tos == pd->tos)) 3791 r = TAILQ_NEXT(r, entries); 3792 else if (r->rule_flag & PFRULE_FRAGMENT) 3793 r = TAILQ_NEXT(r, entries); 3794 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done = 3795#ifdef __FreeBSD__ 3796 pf_socket_lookup(direction, pd, inp), 1)) && 3797#else 3798 pf_socket_lookup(direction, pd), 1)) && 3799#endif 3800 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1], 3801 pd->lookup.uid)) 3802 r = TAILQ_NEXT(r, entries); 3803 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done = 3804#ifdef __FreeBSD__ 3805 pf_socket_lookup(direction, pd, inp), 1)) && 3806#else 3807 pf_socket_lookup(direction, pd), 1)) && 3808#endif 3809 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1], 3810 pd->lookup.gid)) 3811 r = TAILQ_NEXT(r, entries); 3812 else if (r->prob && r->prob <= arc4random()) 3813 r = TAILQ_NEXT(r, entries); 3814 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 3815 r = TAILQ_NEXT(r, entries); 3816 else if (r->os_fingerprint != PF_OSFP_ANY) 3817 r = TAILQ_NEXT(r, entries); 3818 else { 3819 if (r->tag) 3820 tag = r->tag; 3821 if (r->rtableid >= 0) 3822 rtableid = r->rtableid; 3823 if (r->anchor == NULL) { 3824 match = 1; 3825 *rm = r; 3826 *am = a; 3827 *rsm = ruleset; 3828 if ((*rm)->quick) 3829 break; 3830 r = TAILQ_NEXT(r, entries); 3831 } else 3832 pf_step_into_anchor(&asd, &ruleset, 3833 PF_RULESET_FILTER, &r, &a, &match); 3834 } 3835 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 3836 PF_RULESET_FILTER, &r, &a, &match)) 3837 break; 3838 } 3839 r = *rm; 3840 a = *am; 3841 ruleset = *rsm; 3842 3843 REASON_SET(&reason, PFRES_MATCH); 3844 3845 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 3846 if (rewrite) 3847#ifdef __FreeBSD__ 3848 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 3849#else 3850 m_copyback(m, off, sizeof(*uh), uh); 3851#endif 3852 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 3853 a, ruleset, pd); 3854 } 3855 3856 if ((r->action == PF_DROP) && 3857 ((r->rule_flag & PFRULE_RETURNICMP) || 3858 (r->rule_flag & PFRULE_RETURN))) { 3859 /* undo NAT changes, if they have taken place */ 3860 if (nr != NULL) { 3861 if (direction == PF_OUT) { 3862 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum, 3863 &uh->uh_sum, &pd->baddr, bport, 1, af); 3864 rewrite++; 3865 } else { 3866 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum, 3867 &uh->uh_sum, &pd->baddr, bport, 1, af); 3868 rewrite++; 3869 } 3870 } 3871 if ((af == AF_INET) && r->return_icmp) 3872 pf_send_icmp(m, r->return_icmp >> 8, 3873 r->return_icmp & 255, af, r); 3874 else if ((af == AF_INET6) && r->return_icmp6) 3875 pf_send_icmp(m, r->return_icmp6 >> 8, 3876 r->return_icmp6 & 255, af, r); 3877 } 3878 3879 if (r->action == PF_DROP) 3880 return (PF_DROP); 3881 3882 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 3883 REASON_SET(&reason, PFRES_MEMORY); 3884 return (PF_DROP); 3885 } 3886 3887 if (r->keep_state || nr != NULL) { 3888 /* create new state */ 3889 struct pf_state *s = NULL; 3890 struct pf_src_node *sn = NULL; 3891 3892 /* check maximums */ 3893 if (r->max_states && (r->states >= r->max_states)) { 3894 pf_status.lcounters[LCNT_STATES]++; 3895 REASON_SET(&reason, PFRES_MAXSTATES); 3896 goto cleanup; 3897 } 3898 /* src node for filter rule */ 3899 if ((r->rule_flag & PFRULE_SRCTRACK || 3900 r->rpool.opts & PF_POOL_STICKYADDR) && 3901 pf_insert_src_node(&sn, r, saddr, af) != 0) { 3902 REASON_SET(&reason, PFRES_SRCLIMIT); 3903 goto cleanup; 3904 } 3905 /* src node for translation rule */ 3906 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 3907 ((direction == PF_OUT && 3908 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 3909 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 3910 REASON_SET(&reason, PFRES_SRCLIMIT); 3911 goto cleanup; 3912 } 3913 s = pool_get(&pf_state_pl, PR_NOWAIT); 3914 if (s == NULL) { 3915 REASON_SET(&reason, PFRES_MEMORY); 3916cleanup: 3917 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 3918 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 3919 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3920 pf_status.src_nodes--; 3921 pool_put(&pf_src_tree_pl, sn); 3922 } 3923 if (nsn != sn && nsn != NULL && nsn->states == 0 && 3924 nsn->expire == 0) { 3925 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 3926 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 3927 pf_status.src_nodes--; 3928 pool_put(&pf_src_tree_pl, nsn); 3929 } 3930 return (PF_DROP); 3931 } 3932 bzero(s, sizeof(*s)); 3933 s->rule.ptr = r; 3934 s->nat_rule.ptr = nr; 3935 s->anchor.ptr = a; 3936 STATE_INC_COUNTERS(s); 3937 if (r->allow_opts) 3938 s->state_flags |= PFSTATE_ALLOWOPTS; 3939 if (r->rule_flag & PFRULE_STATESLOPPY) 3940 s->state_flags |= PFSTATE_SLOPPY; 3941 s->log = r->log & PF_LOG_ALL; 3942 if (nr != NULL) 3943 s->log |= nr->log & PF_LOG_ALL; 3944 s->proto = IPPROTO_UDP; 3945 s->direction = direction; 3946 s->af = af; 3947 if (direction == PF_OUT) { 3948 PF_ACPY(&s->gwy.addr, saddr, af); 3949 s->gwy.port = uh->uh_sport; 3950 PF_ACPY(&s->ext.addr, daddr, af); 3951 s->ext.port = uh->uh_dport; 3952 if (nr != NULL) { 3953 PF_ACPY(&s->lan.addr, &pd->baddr, af); 3954 s->lan.port = bport; 3955 } else { 3956 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 3957 s->lan.port = s->gwy.port; 3958 } 3959 } else { 3960 PF_ACPY(&s->lan.addr, daddr, af); 3961 s->lan.port = uh->uh_dport; 3962 PF_ACPY(&s->ext.addr, saddr, af); 3963 s->ext.port = uh->uh_sport; 3964 if (nr != NULL) { 3965 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 3966 s->gwy.port = bport; 3967 } else { 3968 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 3969 s->gwy.port = s->lan.port; 3970 } 3971 } 3972 s->src.state = PFUDPS_SINGLE; 3973 s->dst.state = PFUDPS_NO_TRAFFIC; 3974 s->creation = time_second; 3975 s->expire = time_second; 3976 s->timeout = PFTM_UDP_FIRST_PACKET; 3977 pf_set_rt_ifp(s, saddr); 3978 if (sn != NULL) { 3979 s->src_node = sn; 3980 s->src_node->states++; 3981 } 3982 if (nsn != NULL) { 3983 PF_ACPY(&nsn->raddr, &pd->naddr, af); 3984 s->nat_src_node = nsn; 3985 s->nat_src_node->states++; 3986 } 3987 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 3988 REASON_SET(&reason, PFRES_STATEINS); 3989 pf_src_tree_remove_state(s); 3990 STATE_DEC_COUNTERS(s); 3991 pool_put(&pf_state_pl, s); 3992 return (PF_DROP); 3993 } else 3994 *sm = s; 3995 if (tag > 0) { 3996 pf_tag_ref(tag); 3997 s->tag = tag; 3998 } 3999 } 4000 4001 /* copy back packet headers if we performed NAT operations */ 4002 if (rewrite) 4003 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 4004 4005 return (PF_PASS); 4006} 4007 4008int 4009pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction, 4010 struct pfi_kif *kif, struct mbuf *m, int off, void *h, 4011 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm, 4012 struct ifqueue *ifq) 4013{ 4014 struct pf_rule *nr = NULL; 4015 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4016 struct pf_rule *r, *a = NULL; 4017 struct pf_ruleset *ruleset = NULL; 4018 struct pf_src_node *nsn = NULL; 4019 u_short reason; 4020 u_int16_t icmpid = 0, bport, nport = 0; 4021 sa_family_t af = pd->af; 4022 u_int8_t icmptype = 0; /* make the compiler happy */ 4023 u_int8_t icmpcode = 0; /* make the compiler happy */ 4024 int state_icmp = 0; 4025 int tag = -1, rtableid = -1; 4026#ifdef INET6 4027 int rewrite = 0; 4028#endif /* INET6 */ 4029 int asd = 0; 4030 int match = 0; 4031 4032 if (pf_check_congestion(ifq)) { 4033 REASON_SET(&reason, PFRES_CONGEST); 4034 return (PF_DROP); 4035 } 4036 4037 switch (pd->proto) { 4038#ifdef INET 4039 case IPPROTO_ICMP: 4040 icmptype = pd->hdr.icmp->icmp_type; 4041 icmpcode = pd->hdr.icmp->icmp_code; 4042 icmpid = pd->hdr.icmp->icmp_id; 4043 4044 if (icmptype == ICMP_UNREACH || 4045 icmptype == ICMP_SOURCEQUENCH || 4046 icmptype == ICMP_REDIRECT || 4047 icmptype == ICMP_TIMXCEED || 4048 icmptype == ICMP_PARAMPROB) 4049 state_icmp++; 4050 break; 4051#endif /* INET */ 4052#ifdef INET6 4053 case IPPROTO_ICMPV6: 4054 icmptype = pd->hdr.icmp6->icmp6_type; 4055 icmpcode = pd->hdr.icmp6->icmp6_code; 4056 icmpid = pd->hdr.icmp6->icmp6_id; 4057 4058 if (icmptype == ICMP6_DST_UNREACH || 4059 icmptype == ICMP6_PACKET_TOO_BIG || 4060 icmptype == ICMP6_TIME_EXCEEDED || 4061 icmptype == ICMP6_PARAM_PROB) 4062 state_icmp++; 4063 break; 4064#endif /* INET6 */ 4065 } 4066 4067 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4068 4069 if (direction == PF_OUT) { 4070 bport = nport = icmpid; 4071 /* check outgoing packet for BINAT/NAT */ 4072 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4073 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4074 NULL) { 4075 PF_ACPY(&pd->baddr, saddr, af); 4076 switch (af) { 4077#ifdef INET 4078 case AF_INET: 4079 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4080 pd->naddr.v4.s_addr, 0); 4081 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup( 4082 pd->hdr.icmp->icmp_cksum, icmpid, nport, 0); 4083 pd->hdr.icmp->icmp_id = nport; 4084 m_copyback(m, off, ICMP_MINLEN, 4085 (caddr_t)pd->hdr.icmp); 4086 break; 4087#endif /* INET */ 4088#ifdef INET6 4089 case AF_INET6: 4090 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum, 4091 &pd->naddr, 0); 4092 rewrite++; 4093 break; 4094#endif /* INET6 */ 4095 } 4096 if (nr->natpass) 4097 r = NULL; 4098 pd->nat_rule = nr; 4099 } 4100 } else { 4101 bport = nport = icmpid; 4102 /* check incoming packet for BINAT/RDR */ 4103 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4104 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) != 4105 NULL) { 4106 PF_ACPY(&pd->baddr, daddr, af); 4107 switch (af) { 4108#ifdef INET 4109 case AF_INET: 4110 pf_change_a(&daddr->v4.s_addr, 4111 pd->ip_sum, pd->naddr.v4.s_addr, 0); 4112 break; 4113#endif /* INET */ 4114#ifdef INET6 4115 case AF_INET6: 4116 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum, 4117 &pd->naddr, 0); 4118 rewrite++; 4119 break; 4120#endif /* INET6 */ 4121 } 4122 if (nr->natpass) 4123 r = NULL; 4124 pd->nat_rule = nr; 4125 } 4126 } 4127 4128 while (r != NULL) { 4129 r->evaluations++; 4130 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4131 r = r->skip[PF_SKIP_IFP].ptr; 4132 else if (r->direction && r->direction != direction) 4133 r = r->skip[PF_SKIP_DIR].ptr; 4134 else if (r->af && r->af != af) 4135 r = r->skip[PF_SKIP_AF].ptr; 4136 else if (r->proto && r->proto != pd->proto) 4137 r = r->skip[PF_SKIP_PROTO].ptr; 4138 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, 4139 r->src.neg, kif)) 4140 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4141 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, 4142 r->dst.neg, NULL)) 4143 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4144 else if (r->type && r->type != icmptype + 1) 4145 r = TAILQ_NEXT(r, entries); 4146 else if (r->code && r->code != icmpcode + 1) 4147 r = TAILQ_NEXT(r, entries); 4148 else if (r->tos && !(r->tos == pd->tos)) 4149 r = TAILQ_NEXT(r, entries); 4150 else if (r->rule_flag & PFRULE_FRAGMENT) 4151 r = TAILQ_NEXT(r, entries); 4152 else if (r->prob && r->prob <= arc4random()) 4153 r = TAILQ_NEXT(r, entries); 4154 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4155 r = TAILQ_NEXT(r, entries); 4156 else if (r->os_fingerprint != PF_OSFP_ANY) 4157 r = TAILQ_NEXT(r, entries); 4158 else { 4159 if (r->tag) 4160 tag = r->tag; 4161 if (r->rtableid >= 0) 4162 rtableid = r->rtableid; 4163 if (r->anchor == NULL) { 4164 match = 1; 4165 *rm = r; 4166 *am = a; 4167 *rsm = ruleset; 4168 if ((*rm)->quick) 4169 break; 4170 r = TAILQ_NEXT(r, entries); 4171 } else 4172 pf_step_into_anchor(&asd, &ruleset, 4173 PF_RULESET_FILTER, &r, &a, &match); 4174 } 4175 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4176 PF_RULESET_FILTER, &r, &a, &match)) 4177 break; 4178 } 4179 r = *rm; 4180 a = *am; 4181 ruleset = *rsm; 4182 4183 REASON_SET(&reason, PFRES_MATCH); 4184 4185 if (r->log || (nr != NULL && nr->natpass && nr->log)) { 4186#ifdef INET6 4187 if (rewrite) 4188 m_copyback(m, off, sizeof(struct icmp6_hdr), 4189 (caddr_t)pd->hdr.icmp6); 4190#endif /* INET6 */ 4191 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4192 a, ruleset, pd); 4193 } 4194 4195 if (r->action != PF_PASS) 4196 return (PF_DROP); 4197 4198 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4199 REASON_SET(&reason, PFRES_MEMORY); 4200 return (PF_DROP); 4201 } 4202 4203 if (!state_icmp && (r->keep_state || nr != NULL)) { 4204 /* create new state */ 4205 struct pf_state *s = NULL; 4206 struct pf_src_node *sn = NULL; 4207 4208 /* check maximums */ 4209 if (r->max_states && (r->states >= r->max_states)) { 4210 pf_status.lcounters[LCNT_STATES]++; 4211 REASON_SET(&reason, PFRES_MAXSTATES); 4212 goto cleanup; 4213 } 4214 /* src node for filter rule */ 4215 if ((r->rule_flag & PFRULE_SRCTRACK || 4216 r->rpool.opts & PF_POOL_STICKYADDR) && 4217 pf_insert_src_node(&sn, r, saddr, af) != 0) { 4218 REASON_SET(&reason, PFRES_SRCLIMIT); 4219 goto cleanup; 4220 } 4221 /* src node for translation rule */ 4222 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4223 ((direction == PF_OUT && 4224 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4225 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4226 REASON_SET(&reason, PFRES_SRCLIMIT); 4227 goto cleanup; 4228 } 4229 s = pool_get(&pf_state_pl, PR_NOWAIT); 4230 if (s == NULL) { 4231 REASON_SET(&reason, PFRES_MEMORY); 4232cleanup: 4233 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4234 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4235 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4236 pf_status.src_nodes--; 4237 pool_put(&pf_src_tree_pl, sn); 4238 } 4239 if (nsn != sn && nsn != NULL && nsn->states == 0 && 4240 nsn->expire == 0) { 4241 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4242 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4243 pf_status.src_nodes--; 4244 pool_put(&pf_src_tree_pl, nsn); 4245 } 4246 return (PF_DROP); 4247 } 4248 bzero(s, sizeof(*s)); 4249 s->rule.ptr = r; 4250 s->nat_rule.ptr = nr; 4251 s->anchor.ptr = a; 4252 STATE_INC_COUNTERS(s); 4253 if (r->allow_opts) 4254 s->state_flags |= PFSTATE_ALLOWOPTS; 4255 if (r->rule_flag & PFRULE_STATESLOPPY) 4256 s->state_flags |= PFSTATE_SLOPPY; 4257 s->log = r->log & PF_LOG_ALL; 4258 if (nr != NULL) 4259 s->log |= nr->log & PF_LOG_ALL; 4260 s->proto = pd->proto; 4261 s->direction = direction; 4262 s->af = af; 4263 if (direction == PF_OUT) { 4264 PF_ACPY(&s->gwy.addr, saddr, af); 4265 s->gwy.port = nport; 4266 PF_ACPY(&s->ext.addr, daddr, af); 4267 s->ext.port = 0; 4268 if (nr != NULL) { 4269 PF_ACPY(&s->lan.addr, &pd->baddr, af); 4270 s->lan.port = bport; 4271 } else { 4272 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4273 s->lan.port = s->gwy.port; 4274 } 4275 } else { 4276 PF_ACPY(&s->lan.addr, daddr, af); 4277 s->lan.port = nport; 4278 PF_ACPY(&s->ext.addr, saddr, af); 4279 s->ext.port = 0; 4280 if (nr != NULL) { 4281 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4282 s->gwy.port = bport; 4283 } else { 4284 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4285 s->gwy.port = s->lan.port; 4286 } 4287 } 4288 s->creation = time_second; 4289 s->expire = time_second; 4290 s->timeout = PFTM_ICMP_FIRST_PACKET; 4291 pf_set_rt_ifp(s, saddr); 4292 if (sn != NULL) { 4293 s->src_node = sn; 4294 s->src_node->states++; 4295 } 4296 if (nsn != NULL) { 4297 PF_ACPY(&nsn->raddr, &pd->naddr, af); 4298 s->nat_src_node = nsn; 4299 s->nat_src_node->states++; 4300 } 4301 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4302 REASON_SET(&reason, PFRES_STATEINS); 4303 pf_src_tree_remove_state(s); 4304 STATE_DEC_COUNTERS(s); 4305 pool_put(&pf_state_pl, s); 4306 return (PF_DROP); 4307 } else 4308 *sm = s; 4309 if (tag > 0) { 4310 pf_tag_ref(tag); 4311 s->tag = tag; 4312 } 4313 } 4314 4315#ifdef INET6 4316 /* copy back packet headers if we performed IPv6 NAT operations */ 4317 if (rewrite) 4318 m_copyback(m, off, sizeof(struct icmp6_hdr), 4319 (caddr_t)pd->hdr.icmp6); 4320#endif /* INET6 */ 4321 4322 return (PF_PASS); 4323} 4324 4325int 4326pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction, 4327 struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 4328 struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq) 4329{ 4330 struct pf_rule *nr = NULL; 4331 struct pf_rule *r, *a = NULL; 4332 struct pf_ruleset *ruleset = NULL; 4333 struct pf_src_node *nsn = NULL; 4334 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 4335 sa_family_t af = pd->af; 4336 u_short reason; 4337 int tag = -1, rtableid = -1; 4338 int asd = 0; 4339 int match = 0; 4340 4341 if (pf_check_congestion(ifq)) { 4342 REASON_SET(&reason, PFRES_CONGEST); 4343 return (PF_DROP); 4344 } 4345 4346 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4347 4348 if (direction == PF_OUT) { 4349 /* check outgoing packet for BINAT/NAT */ 4350 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn, 4351 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4352 PF_ACPY(&pd->baddr, saddr, af); 4353 switch (af) { 4354#ifdef INET 4355 case AF_INET: 4356 pf_change_a(&saddr->v4.s_addr, pd->ip_sum, 4357 pd->naddr.v4.s_addr, 0); 4358 break; 4359#endif /* INET */ 4360#ifdef INET6 4361 case AF_INET6: 4362 PF_ACPY(saddr, &pd->naddr, af); 4363 break; 4364#endif /* INET6 */ 4365 } 4366 if (nr->natpass) 4367 r = NULL; 4368 pd->nat_rule = nr; 4369 } 4370 } else { 4371 /* check incoming packet for BINAT/RDR */ 4372 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn, 4373 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) { 4374 PF_ACPY(&pd->baddr, daddr, af); 4375 switch (af) { 4376#ifdef INET 4377 case AF_INET: 4378 pf_change_a(&daddr->v4.s_addr, 4379 pd->ip_sum, pd->naddr.v4.s_addr, 0); 4380 break; 4381#endif /* INET */ 4382#ifdef INET6 4383 case AF_INET6: 4384 PF_ACPY(daddr, &pd->naddr, af); 4385 break; 4386#endif /* INET6 */ 4387 } 4388 if (nr->natpass) 4389 r = NULL; 4390 pd->nat_rule = nr; 4391 } 4392 } 4393 4394 while (r != NULL) { 4395 r->evaluations++; 4396 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4397 r = r->skip[PF_SKIP_IFP].ptr; 4398 else if (r->direction && r->direction != direction) 4399 r = r->skip[PF_SKIP_DIR].ptr; 4400 else if (r->af && r->af != af) 4401 r = r->skip[PF_SKIP_AF].ptr; 4402 else if (r->proto && r->proto != pd->proto) 4403 r = r->skip[PF_SKIP_PROTO].ptr; 4404 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4405 r->src.neg, kif)) 4406 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4407 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4408 r->dst.neg, NULL)) 4409 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4410 else if (r->tos && !(r->tos == pd->tos)) 4411 r = TAILQ_NEXT(r, entries); 4412 else if (r->rule_flag & PFRULE_FRAGMENT) 4413 r = TAILQ_NEXT(r, entries); 4414 else if (r->prob && r->prob <= arc4random()) 4415 r = TAILQ_NEXT(r, entries); 4416 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4417 r = TAILQ_NEXT(r, entries); 4418 else if (r->os_fingerprint != PF_OSFP_ANY) 4419 r = TAILQ_NEXT(r, entries); 4420 else { 4421 if (r->tag) 4422 tag = r->tag; 4423 if (r->rtableid >= 0) 4424 rtableid = r->rtableid; 4425 if (r->anchor == NULL) { 4426 match = 1; 4427 *rm = r; 4428 *am = a; 4429 *rsm = ruleset; 4430 if ((*rm)->quick) 4431 break; 4432 r = TAILQ_NEXT(r, entries); 4433 } else 4434 pf_step_into_anchor(&asd, &ruleset, 4435 PF_RULESET_FILTER, &r, &a, &match); 4436 } 4437 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4438 PF_RULESET_FILTER, &r, &a, &match)) 4439 break; 4440 } 4441 r = *rm; 4442 a = *am; 4443 ruleset = *rsm; 4444 4445 REASON_SET(&reason, PFRES_MATCH); 4446 4447 if (r->log || (nr != NULL && nr->natpass && nr->log)) 4448 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr, 4449 a, ruleset, pd); 4450 4451 if ((r->action == PF_DROP) && 4452 ((r->rule_flag & PFRULE_RETURNICMP) || 4453 (r->rule_flag & PFRULE_RETURN))) { 4454 struct pf_addr *a = NULL; 4455 4456 if (nr != NULL) { 4457 if (direction == PF_OUT) 4458 a = saddr; 4459 else 4460 a = daddr; 4461 } 4462 if (a != NULL) { 4463 switch (af) { 4464#ifdef INET 4465 case AF_INET: 4466 pf_change_a(&a->v4.s_addr, pd->ip_sum, 4467 pd->baddr.v4.s_addr, 0); 4468 break; 4469#endif /* INET */ 4470#ifdef INET6 4471 case AF_INET6: 4472 PF_ACPY(a, &pd->baddr, af); 4473 break; 4474#endif /* INET6 */ 4475 } 4476 } 4477 if ((af == AF_INET) && r->return_icmp) 4478 pf_send_icmp(m, r->return_icmp >> 8, 4479 r->return_icmp & 255, af, r); 4480 else if ((af == AF_INET6) && r->return_icmp6) 4481 pf_send_icmp(m, r->return_icmp6 >> 8, 4482 r->return_icmp6 & 255, af, r); 4483 } 4484 4485 if (r->action != PF_PASS) 4486 return (PF_DROP); 4487 4488 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) { 4489 REASON_SET(&reason, PFRES_MEMORY); 4490 return (PF_DROP); 4491 } 4492 4493 if (r->keep_state || nr != NULL) { 4494 /* create new state */ 4495 struct pf_state *s = NULL; 4496 struct pf_src_node *sn = NULL; 4497 4498 /* check maximums */ 4499 if (r->max_states && (r->states >= r->max_states)) { 4500 pf_status.lcounters[LCNT_STATES]++; 4501 REASON_SET(&reason, PFRES_MAXSTATES); 4502 goto cleanup; 4503 } 4504 /* src node for filter rule */ 4505 if ((r->rule_flag & PFRULE_SRCTRACK || 4506 r->rpool.opts & PF_POOL_STICKYADDR) && 4507 pf_insert_src_node(&sn, r, saddr, af) != 0) { 4508 REASON_SET(&reason, PFRES_SRCLIMIT); 4509 goto cleanup; 4510 } 4511 /* src node for translation rule */ 4512 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) && 4513 ((direction == PF_OUT && 4514 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) || 4515 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) { 4516 REASON_SET(&reason, PFRES_SRCLIMIT); 4517 goto cleanup; 4518 } 4519 s = pool_get(&pf_state_pl, PR_NOWAIT); 4520 if (s == NULL) { 4521 REASON_SET(&reason, PFRES_MEMORY); 4522cleanup: 4523 if (sn != NULL && sn->states == 0 && sn->expire == 0) { 4524 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn); 4525 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4526 pf_status.src_nodes--; 4527 pool_put(&pf_src_tree_pl, sn); 4528 } 4529 if (nsn != sn && nsn != NULL && nsn->states == 0 && 4530 nsn->expire == 0) { 4531 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn); 4532 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++; 4533 pf_status.src_nodes--; 4534 pool_put(&pf_src_tree_pl, nsn); 4535 } 4536 return (PF_DROP); 4537 } 4538 bzero(s, sizeof(*s)); 4539 s->rule.ptr = r; 4540 s->nat_rule.ptr = nr; 4541 s->anchor.ptr = a; 4542 STATE_INC_COUNTERS(s); 4543 if (r->allow_opts) 4544 s->state_flags |= PFSTATE_ALLOWOPTS; 4545 if (r->rule_flag & PFRULE_STATESLOPPY) 4546 s->state_flags |= PFSTATE_SLOPPY; 4547 s->log = r->log & PF_LOG_ALL; 4548 if (nr != NULL) 4549 s->log |= nr->log & PF_LOG_ALL; 4550 s->proto = pd->proto; 4551 s->direction = direction; 4552 s->af = af; 4553 if (direction == PF_OUT) { 4554 PF_ACPY(&s->gwy.addr, saddr, af); 4555 PF_ACPY(&s->ext.addr, daddr, af); 4556 if (nr != NULL) 4557 PF_ACPY(&s->lan.addr, &pd->baddr, af); 4558 else 4559 PF_ACPY(&s->lan.addr, &s->gwy.addr, af); 4560 } else { 4561 PF_ACPY(&s->lan.addr, daddr, af); 4562 PF_ACPY(&s->ext.addr, saddr, af); 4563 if (nr != NULL) 4564 PF_ACPY(&s->gwy.addr, &pd->baddr, af); 4565 else 4566 PF_ACPY(&s->gwy.addr, &s->lan.addr, af); 4567 } 4568 s->src.state = PFOTHERS_SINGLE; 4569 s->dst.state = PFOTHERS_NO_TRAFFIC; 4570 s->creation = time_second; 4571 s->expire = time_second; 4572 s->timeout = PFTM_OTHER_FIRST_PACKET; 4573 pf_set_rt_ifp(s, saddr); 4574 if (sn != NULL) { 4575 s->src_node = sn; 4576 s->src_node->states++; 4577 } 4578 if (nsn != NULL) { 4579 PF_ACPY(&nsn->raddr, &pd->naddr, af); 4580 s->nat_src_node = nsn; 4581 s->nat_src_node->states++; 4582 } 4583 if (pf_insert_state(BOUND_IFACE(r, kif), s)) { 4584 REASON_SET(&reason, PFRES_STATEINS); 4585 pf_src_tree_remove_state(s); 4586 STATE_DEC_COUNTERS(s); 4587 pool_put(&pf_state_pl, s); 4588 return (PF_DROP); 4589 } else 4590 *sm = s; 4591 if (tag > 0) { 4592 pf_tag_ref(tag); 4593 s->tag = tag; 4594 } 4595 } 4596 4597 return (PF_PASS); 4598} 4599 4600int 4601pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif, 4602 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am, 4603 struct pf_ruleset **rsm) 4604{ 4605 struct pf_rule *r, *a = NULL; 4606 struct pf_ruleset *ruleset = NULL; 4607 sa_family_t af = pd->af; 4608 u_short reason; 4609 int tag = -1; 4610 int asd = 0; 4611 int match = 0; 4612 4613 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr); 4614 while (r != NULL) { 4615 r->evaluations++; 4616 if (pfi_kif_match(r->kif, kif) == r->ifnot) 4617 r = r->skip[PF_SKIP_IFP].ptr; 4618 else if (r->direction && r->direction != direction) 4619 r = r->skip[PF_SKIP_DIR].ptr; 4620 else if (r->af && r->af != af) 4621 r = r->skip[PF_SKIP_AF].ptr; 4622 else if (r->proto && r->proto != pd->proto) 4623 r = r->skip[PF_SKIP_PROTO].ptr; 4624 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, 4625 r->src.neg, kif)) 4626 r = r->skip[PF_SKIP_SRC_ADDR].ptr; 4627 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, 4628 r->dst.neg, NULL)) 4629 r = r->skip[PF_SKIP_DST_ADDR].ptr; 4630 else if (r->tos && !(r->tos == pd->tos)) 4631 r = TAILQ_NEXT(r, entries); 4632 else if (r->os_fingerprint != PF_OSFP_ANY) 4633 r = TAILQ_NEXT(r, entries); 4634 else if (pd->proto == IPPROTO_UDP && 4635 (r->src.port_op || r->dst.port_op)) 4636 r = TAILQ_NEXT(r, entries); 4637 else if (pd->proto == IPPROTO_TCP && 4638 (r->src.port_op || r->dst.port_op || r->flagset)) 4639 r = TAILQ_NEXT(r, entries); 4640 else if ((pd->proto == IPPROTO_ICMP || 4641 pd->proto == IPPROTO_ICMPV6) && 4642 (r->type || r->code)) 4643 r = TAILQ_NEXT(r, entries); 4644 else if (r->prob && r->prob <= arc4random()) 4645 r = TAILQ_NEXT(r, entries); 4646 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag)) 4647 r = TAILQ_NEXT(r, entries); 4648 else { 4649 if (r->anchor == NULL) { 4650 match = 1; 4651 *rm = r; 4652 *am = a; 4653 *rsm = ruleset; 4654 if ((*rm)->quick) 4655 break; 4656 r = TAILQ_NEXT(r, entries); 4657 } else 4658 pf_step_into_anchor(&asd, &ruleset, 4659 PF_RULESET_FILTER, &r, &a, &match); 4660 } 4661 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset, 4662 PF_RULESET_FILTER, &r, &a, &match)) 4663 break; 4664 } 4665 r = *rm; 4666 a = *am; 4667 ruleset = *rsm; 4668 4669 REASON_SET(&reason, PFRES_MATCH); 4670 4671 if (r->log) 4672 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset, 4673 pd); 4674 4675 if (r->action != PF_PASS) 4676 return (PF_DROP); 4677 4678 if (pf_tag_packet(m, pd->pf_mtag, tag, -1)) { 4679 REASON_SET(&reason, PFRES_MEMORY); 4680 return (PF_DROP); 4681 } 4682 4683 return (PF_PASS); 4684} 4685 4686int 4687pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst, 4688 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off, 4689 struct pf_pdesc *pd, u_short *reason, int *copyback) 4690{ 4691 struct tcphdr *th = pd->hdr.tcp; 4692 u_int16_t win = ntohs(th->th_win); 4693 u_int32_t ack, end, seq, orig_seq; 4694 u_int8_t sws, dws; 4695 int ackskew; 4696 4697 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) { 4698 sws = src->wscale & PF_WSCALE_MASK; 4699 dws = dst->wscale & PF_WSCALE_MASK; 4700 } else 4701 sws = dws = 0; 4702 4703 /* 4704 * Sequence tracking algorithm from Guido van Rooij's paper: 4705 * http://www.madison-gurkha.com/publications/tcp_filtering/ 4706 * tcp_filtering.ps 4707 */ 4708 4709 orig_seq = seq = ntohl(th->th_seq); 4710 if (src->seqlo == 0) { 4711 /* First packet from this end. Set its state */ 4712 4713 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) && 4714 src->scrub == NULL) { 4715 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) { 4716 REASON_SET(reason, PFRES_MEMORY); 4717 return (PF_DROP); 4718 } 4719 } 4720 4721 /* Deferred generation of sequence number modulator */ 4722 if (dst->seqdiff && !src->seqdiff) { 4723#ifdef __FreeBSD__ 4724 while ((src->seqdiff = pf_new_isn(*state) - seq) == 0) 4725 ; 4726#else 4727 while ((src->seqdiff = tcp_rndiss_next() - seq) == 0) 4728 ; 4729#endif 4730 ack = ntohl(th->th_ack) - dst->seqdiff; 4731 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4732 src->seqdiff), 0); 4733 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4734 *copyback = 1; 4735 } else { 4736 ack = ntohl(th->th_ack); 4737 } 4738 4739 end = seq + pd->p_len; 4740 if (th->th_flags & TH_SYN) { 4741 end++; 4742 if (dst->wscale & PF_WSCALE_FLAG) { 4743 src->wscale = pf_get_wscale(m, off, th->th_off, 4744 pd->af); 4745 if (src->wscale & PF_WSCALE_FLAG) { 4746 /* Remove scale factor from initial 4747 * window */ 4748 sws = src->wscale & PF_WSCALE_MASK; 4749 win = ((u_int32_t)win + (1 << sws) - 1) 4750 >> sws; 4751 dws = dst->wscale & PF_WSCALE_MASK; 4752 } else { 4753 /* fixup other window */ 4754 dst->max_win <<= dst->wscale & 4755 PF_WSCALE_MASK; 4756 /* in case of a retrans SYN|ACK */ 4757 dst->wscale = 0; 4758 } 4759 } 4760 } 4761 if (th->th_flags & TH_FIN) 4762 end++; 4763 4764 src->seqlo = seq; 4765 if (src->state < TCPS_SYN_SENT) 4766 src->state = TCPS_SYN_SENT; 4767 4768 /* 4769 * May need to slide the window (seqhi may have been set by 4770 * the crappy stack check or if we picked up the connection 4771 * after establishment) 4772 */ 4773 if (src->seqhi == 1 || 4774 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi)) 4775 src->seqhi = end + MAX(1, dst->max_win << dws); 4776 if (win > src->max_win) 4777 src->max_win = win; 4778 4779 } else { 4780 ack = ntohl(th->th_ack) - dst->seqdiff; 4781 if (src->seqdiff) { 4782 /* Modulate sequence numbers */ 4783 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq + 4784 src->seqdiff), 0); 4785 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0); 4786 *copyback = 1; 4787 } 4788 end = seq + pd->p_len; 4789 if (th->th_flags & TH_SYN) 4790 end++; 4791 if (th->th_flags & TH_FIN) 4792 end++; 4793 } 4794 4795 if ((th->th_flags & TH_ACK) == 0) { 4796 /* Let it pass through the ack skew check */ 4797 ack = dst->seqlo; 4798 } else if ((ack == 0 && 4799 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) || 4800 /* broken tcp stacks do not set ack */ 4801 (dst->state < TCPS_SYN_SENT)) { 4802 /* 4803 * Many stacks (ours included) will set the ACK number in an 4804 * FIN|ACK if the SYN times out -- no sequence to ACK. 4805 */ 4806 ack = dst->seqlo; 4807 } 4808 4809 if (seq == end) { 4810 /* Ease sequencing restrictions on no data packets */ 4811 seq = src->seqlo; 4812 end = seq; 4813 } 4814 4815 ackskew = dst->seqlo - ack; 4816 4817 4818 /* 4819 * Need to demodulate the sequence numbers in any TCP SACK options 4820 * (Selective ACK). We could optionally validate the SACK values 4821 * against the current ACK window, either forwards or backwards, but 4822 * I'm not confident that SACK has been implemented properly 4823 * everywhere. It wouldn't surprise me if several stacks accidently 4824 * SACK too far backwards of previously ACKed data. There really aren't 4825 * any security implications of bad SACKing unless the target stack 4826 * doesn't validate the option length correctly. Someone trying to 4827 * spoof into a TCP connection won't bother blindly sending SACK 4828 * options anyway. 4829 */ 4830 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) { 4831 if (pf_modulate_sack(m, off, pd, th, dst)) 4832 *copyback = 1; 4833 } 4834 4835 4836#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */ 4837 if (SEQ_GEQ(src->seqhi, end) && 4838 /* Last octet inside other's window space */ 4839 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) && 4840 /* Retrans: not more than one window back */ 4841 (ackskew >= -MAXACKWINDOW) && 4842 /* Acking not more than one reassembled fragment backwards */ 4843 (ackskew <= (MAXACKWINDOW << sws)) && 4844 /* Acking not more than one window forward */ 4845 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || 4846 (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) { 4847 /* Require an exact/+1 sequence match on resets when possible */ 4848 4849 if (dst->scrub || src->scrub) { 4850 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4851 *state, src, dst, copyback)) 4852 return (PF_DROP); 4853 } 4854 4855 /* update max window */ 4856 if (src->max_win < win) 4857 src->max_win = win; 4858 /* synchronize sequencing */ 4859 if (SEQ_GT(end, src->seqlo)) 4860 src->seqlo = end; 4861 /* slide the window of what the other end can send */ 4862 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4863 dst->seqhi = ack + MAX((win << sws), 1); 4864 4865 4866 /* update states */ 4867 if (th->th_flags & TH_SYN) 4868 if (src->state < TCPS_SYN_SENT) 4869 src->state = TCPS_SYN_SENT; 4870 if (th->th_flags & TH_FIN) 4871 if (src->state < TCPS_CLOSING) 4872 src->state = TCPS_CLOSING; 4873 if (th->th_flags & TH_ACK) { 4874 if (dst->state == TCPS_SYN_SENT) { 4875 dst->state = TCPS_ESTABLISHED; 4876 if (src->state == TCPS_ESTABLISHED && 4877 (*state)->src_node != NULL && 4878 pf_src_connlimit(state)) { 4879 REASON_SET(reason, PFRES_SRCLIMIT); 4880 return (PF_DROP); 4881 } 4882 } else if (dst->state == TCPS_CLOSING) 4883 dst->state = TCPS_FIN_WAIT_2; 4884 } 4885 if (th->th_flags & TH_RST) 4886 src->state = dst->state = TCPS_TIME_WAIT; 4887 4888 /* update expire time */ 4889 (*state)->expire = time_second; 4890 if (src->state >= TCPS_FIN_WAIT_2 && 4891 dst->state >= TCPS_FIN_WAIT_2) 4892 (*state)->timeout = PFTM_TCP_CLOSED; 4893 else if (src->state >= TCPS_CLOSING && 4894 dst->state >= TCPS_CLOSING) 4895 (*state)->timeout = PFTM_TCP_FIN_WAIT; 4896 else if (src->state < TCPS_ESTABLISHED || 4897 dst->state < TCPS_ESTABLISHED) 4898 (*state)->timeout = PFTM_TCP_OPENING; 4899 else if (src->state >= TCPS_CLOSING || 4900 dst->state >= TCPS_CLOSING) 4901 (*state)->timeout = PFTM_TCP_CLOSING; 4902 else 4903 (*state)->timeout = PFTM_TCP_ESTABLISHED; 4904 4905 /* Fall through to PASS packet */ 4906 4907 } else if ((dst->state < TCPS_SYN_SENT || 4908 dst->state >= TCPS_FIN_WAIT_2 || 4909 src->state >= TCPS_FIN_WAIT_2) && 4910 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) && 4911 /* Within a window forward of the originating packet */ 4912 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) { 4913 /* Within a window backward of the originating packet */ 4914 4915 /* 4916 * This currently handles three situations: 4917 * 1) Stupid stacks will shotgun SYNs before their peer 4918 * replies. 4919 * 2) When PF catches an already established stream (the 4920 * firewall rebooted, the state table was flushed, routes 4921 * changed...) 4922 * 3) Packets get funky immediately after the connection 4923 * closes (this should catch Solaris spurious ACK|FINs 4924 * that web servers like to spew after a close) 4925 * 4926 * This must be a little more careful than the above code 4927 * since packet floods will also be caught here. We don't 4928 * update the TTL here to mitigate the damage of a packet 4929 * flood and so the same code can handle awkward establishment 4930 * and a loosened connection close. 4931 * In the establishment case, a correct peer response will 4932 * validate the connection, go through the normal state code 4933 * and keep updating the state TTL. 4934 */ 4935 4936 if (pf_status.debug >= PF_DEBUG_MISC) { 4937 printf("pf: loose state match: "); 4938 pf_print_state(*state); 4939 pf_print_flags(th->th_flags); 4940 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 4941 "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len, 4942#ifdef __FreeBSD__ 4943 ackskew, (unsigned long long)(*state)->packets[0], 4944 (unsigned long long)(*state)->packets[1]); 4945#else 4946 ackskew, (*state)->packets[0], 4947 (*state)->packets[1]); 4948#endif 4949 } 4950 4951 if (dst->scrub || src->scrub) { 4952 if (pf_normalize_tcp_stateful(m, off, pd, reason, th, 4953 *state, src, dst, copyback)) 4954 return (PF_DROP); 4955 } 4956 4957 /* update max window */ 4958 if (src->max_win < win) 4959 src->max_win = win; 4960 /* synchronize sequencing */ 4961 if (SEQ_GT(end, src->seqlo)) 4962 src->seqlo = end; 4963 /* slide the window of what the other end can send */ 4964 if (SEQ_GEQ(ack + (win << sws), dst->seqhi)) 4965 dst->seqhi = ack + MAX((win << sws), 1); 4966 4967 /* 4968 * Cannot set dst->seqhi here since this could be a shotgunned 4969 * SYN and not an already established connection. 4970 */ 4971 4972 if (th->th_flags & TH_FIN) 4973 if (src->state < TCPS_CLOSING) 4974 src->state = TCPS_CLOSING; 4975 if (th->th_flags & TH_RST) 4976 src->state = dst->state = TCPS_TIME_WAIT; 4977 4978 /* Fall through to PASS packet */ 4979 4980 } else { 4981 if ((*state)->dst.state == TCPS_SYN_SENT && 4982 (*state)->src.state == TCPS_SYN_SENT) { 4983 /* Send RST for state mismatches during handshake */ 4984 if (!(th->th_flags & TH_RST)) 4985#ifdef __FreeBSD__ 4986 pf_send_tcp(m, (*state)->rule.ptr, pd->af, 4987#else 4988 pf_send_tcp((*state)->rule.ptr, pd->af, 4989#endif 4990 pd->dst, pd->src, th->th_dport, 4991 th->th_sport, ntohl(th->th_ack), 0, 4992 TH_RST, 0, 0, 4993 (*state)->rule.ptr->return_ttl, 1, 0, 4994 pd->eh, kif->pfik_ifp); 4995 src->seqlo = 0; 4996 src->seqhi = 1; 4997 src->max_win = 1; 4998 } else if (pf_status.debug >= PF_DEBUG_MISC) { 4999 printf("pf: BAD state: "); 5000 pf_print_state(*state); 5001 pf_print_flags(th->th_flags); 5002 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d " 5003#ifdef notyet 5004 "pkts=%llu:%llu dir=%s,%s\n", 5005#else 5006 "pkts=%llu:%llu%s\n", 5007#endif 5008 seq, orig_seq, ack, pd->p_len, ackskew, 5009#ifdef __FreeBSD__ 5010 (unsigned long long)(*state)->packets[0], 5011 (unsigned long long)(*state)->packets[1], 5012#else 5013 (*state)->packets[0], (*state)->packets[1], 5014#endif 5015#ifdef notyet 5016 direction == PF_IN ? "in" : "out", 5017 direction == (*state)->direction ? "fwd" : "rev"); 5018#else 5019 ""); 5020#endif 5021 printf("pf: State failure on: %c %c %c %c | %c %c\n", 5022 SEQ_GEQ(src->seqhi, end) ? ' ' : '1', 5023 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ? 5024 ' ': '2', 5025 (ackskew >= -MAXACKWINDOW) ? ' ' : '3', 5026 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4', 5027 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5', 5028 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6'); 5029 } 5030 REASON_SET(reason, PFRES_BADSTATE); 5031 return (PF_DROP); 5032 } 5033 5034 /* Any packets which have gotten here are to be passed */ 5035 return (PF_PASS); 5036} 5037 5038int 5039pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst, 5040 struct pf_state **state, struct pf_pdesc *pd, u_short *reason) 5041{ 5042 struct tcphdr *th = pd->hdr.tcp; 5043 5044 if (th->th_flags & TH_SYN) 5045 if (src->state < TCPS_SYN_SENT) 5046 src->state = TCPS_SYN_SENT; 5047 if (th->th_flags & TH_FIN) 5048 if (src->state < TCPS_CLOSING) 5049 src->state = TCPS_CLOSING; 5050 if (th->th_flags & TH_ACK) { 5051 if (dst->state == TCPS_SYN_SENT) { 5052 dst->state = TCPS_ESTABLISHED; 5053 if (src->state == TCPS_ESTABLISHED && 5054 (*state)->src_node != NULL && 5055 pf_src_connlimit(state)) { 5056 REASON_SET(reason, PFRES_SRCLIMIT); 5057 return (PF_DROP); 5058 } 5059 } else if (dst->state == TCPS_CLOSING) { 5060 dst->state = TCPS_FIN_WAIT_2; 5061 } else if (src->state == TCPS_SYN_SENT && 5062 dst->state < TCPS_SYN_SENT) { 5063 /* 5064 * Handle a special sloppy case where we only see one 5065 * half of the connection. If there is a ACK after 5066 * the initial SYN without ever seeing a packet from 5067 * the destination, set the connection to established. 5068 */ 5069 dst->state = src->state = TCPS_ESTABLISHED; 5070 if ((*state)->src_node != NULL && 5071 pf_src_connlimit(state)) { 5072 REASON_SET(reason, PFRES_SRCLIMIT); 5073 return (PF_DROP); 5074 } 5075 } else if (src->state == TCPS_CLOSING && 5076 dst->state == TCPS_ESTABLISHED && 5077 dst->seqlo == 0) { 5078 /* 5079 * Handle the closing of half connections where we 5080 * don't see the full bidirectional FIN/ACK+ACK 5081 * handshake. 5082 */ 5083 dst->state = TCPS_CLOSING; 5084 } 5085 } 5086 if (th->th_flags & TH_RST) 5087 src->state = dst->state = TCPS_TIME_WAIT; 5088 5089 /* update expire time */ 5090 (*state)->expire = time_second; 5091 if (src->state >= TCPS_FIN_WAIT_2 && 5092 dst->state >= TCPS_FIN_WAIT_2) 5093 (*state)->timeout = PFTM_TCP_CLOSED; 5094 else if (src->state >= TCPS_CLOSING && 5095 dst->state >= TCPS_CLOSING) 5096 (*state)->timeout = PFTM_TCP_FIN_WAIT; 5097 else if (src->state < TCPS_ESTABLISHED || 5098 dst->state < TCPS_ESTABLISHED) 5099 (*state)->timeout = PFTM_TCP_OPENING; 5100 else if (src->state >= TCPS_CLOSING || 5101 dst->state >= TCPS_CLOSING) 5102 (*state)->timeout = PFTM_TCP_CLOSING; 5103 else 5104 (*state)->timeout = PFTM_TCP_ESTABLISHED; 5105 5106 return (PF_PASS); 5107} 5108 5109 5110int 5111pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif, 5112 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, 5113 u_short *reason) 5114{ 5115 struct pf_state_cmp key; 5116 struct tcphdr *th = pd->hdr.tcp; 5117 int copyback = 0; 5118 struct pf_state_peer *src, *dst; 5119 5120 key.af = pd->af; 5121 key.proto = IPPROTO_TCP; 5122 if (direction == PF_IN) { 5123 PF_ACPY(&key.ext.addr, pd->src, key.af); 5124 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5125 key.ext.port = th->th_sport; 5126 key.gwy.port = th->th_dport; 5127 } else { 5128 PF_ACPY(&key.lan.addr, pd->src, key.af); 5129 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5130 key.lan.port = th->th_sport; 5131 key.ext.port = th->th_dport; 5132 } 5133 5134 STATE_LOOKUP(); 5135 5136 if (direction == (*state)->direction) { 5137 src = &(*state)->src; 5138 dst = &(*state)->dst; 5139 } else { 5140 src = &(*state)->dst; 5141 dst = &(*state)->src; 5142 } 5143 5144 if ((*state)->src.state == PF_TCPS_PROXY_SRC) { 5145 if (direction != (*state)->direction) { 5146 REASON_SET(reason, PFRES_SYNPROXY); 5147 return (PF_SYNPROXY_DROP); 5148 } 5149 if (th->th_flags & TH_SYN) { 5150 if (ntohl(th->th_seq) != (*state)->src.seqlo) { 5151 REASON_SET(reason, PFRES_SYNPROXY); 5152 return (PF_DROP); 5153 } 5154#ifdef __FreeBSD__ 5155 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 5156#else 5157 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5158#endif 5159 pd->src, th->th_dport, th->th_sport, 5160 (*state)->src.seqhi, ntohl(th->th_seq) + 1, 5161 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 5162 0, NULL, NULL); 5163 REASON_SET(reason, PFRES_SYNPROXY); 5164 return (PF_SYNPROXY_DROP); 5165 } else if (!(th->th_flags & TH_ACK) || 5166 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5167 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5168 REASON_SET(reason, PFRES_SYNPROXY); 5169 return (PF_DROP); 5170 } else if ((*state)->src_node != NULL && 5171 pf_src_connlimit(state)) { 5172 REASON_SET(reason, PFRES_SRCLIMIT); 5173 return (PF_DROP); 5174 } else 5175 (*state)->src.state = PF_TCPS_PROXY_DST; 5176 } 5177 if ((*state)->src.state == PF_TCPS_PROXY_DST) { 5178 struct pf_state_host *src, *dst; 5179 5180 if (direction == PF_OUT) { 5181 src = &(*state)->gwy; 5182 dst = &(*state)->ext; 5183 } else { 5184 src = &(*state)->ext; 5185 dst = &(*state)->lan; 5186 } 5187 if (direction == (*state)->direction) { 5188 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) || 5189 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) || 5190 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) { 5191 REASON_SET(reason, PFRES_SYNPROXY); 5192 return (PF_DROP); 5193 } 5194 (*state)->src.max_win = MAX(ntohs(th->th_win), 1); 5195 if ((*state)->dst.seqhi == 1) 5196 (*state)->dst.seqhi = htonl(arc4random()); 5197#ifdef __FreeBSD__ 5198 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 5199 &src->addr, 5200#else 5201 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 5202#endif 5203 &dst->addr, src->port, dst->port, 5204 (*state)->dst.seqhi, 0, TH_SYN, 0, 5205 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL); 5206 REASON_SET(reason, PFRES_SYNPROXY); 5207 return (PF_SYNPROXY_DROP); 5208 } else if (((th->th_flags & (TH_SYN|TH_ACK)) != 5209 (TH_SYN|TH_ACK)) || 5210 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) { 5211 REASON_SET(reason, PFRES_SYNPROXY); 5212 return (PF_DROP); 5213 } else { 5214 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1); 5215 (*state)->dst.seqlo = ntohl(th->th_seq); 5216#ifdef __FreeBSD__ 5217 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst, 5218#else 5219 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst, 5220#endif 5221 pd->src, th->th_dport, th->th_sport, 5222 ntohl(th->th_ack), ntohl(th->th_seq) + 1, 5223 TH_ACK, (*state)->src.max_win, 0, 0, 0, 5224 (*state)->tag, NULL, NULL); 5225#ifdef __FreeBSD__ 5226 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, 5227 &src->addr, 5228#else 5229 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr, 5230#endif 5231 &dst->addr, src->port, dst->port, 5232 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1, 5233 TH_ACK, (*state)->dst.max_win, 0, 0, 1, 5234 0, NULL, NULL); 5235 (*state)->src.seqdiff = (*state)->dst.seqhi - 5236 (*state)->src.seqlo; 5237 (*state)->dst.seqdiff = (*state)->src.seqhi - 5238 (*state)->dst.seqlo; 5239 (*state)->src.seqhi = (*state)->src.seqlo + 5240 (*state)->dst.max_win; 5241 (*state)->dst.seqhi = (*state)->dst.seqlo + 5242 (*state)->src.max_win; 5243 (*state)->src.wscale = (*state)->dst.wscale = 0; 5244 (*state)->src.state = (*state)->dst.state = 5245 TCPS_ESTABLISHED; 5246 REASON_SET(reason, PFRES_SYNPROXY); 5247 return (PF_SYNPROXY_DROP); 5248 } 5249 } 5250 5251 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) && 5252 dst->state >= TCPS_FIN_WAIT_2 && 5253 src->state >= TCPS_FIN_WAIT_2) { 5254 if (pf_status.debug >= PF_DEBUG_MISC) { 5255 printf("pf: state reuse "); 5256 pf_print_state(*state); 5257 pf_print_flags(th->th_flags); 5258 printf("\n"); 5259 } 5260 /* XXX make sure it's the same direction ?? */ 5261 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED; 5262 pf_unlink_state(*state); 5263 *state = NULL; 5264 return (PF_DROP); 5265 } 5266 5267 if ((*state)->state_flags & PFSTATE_SLOPPY) { 5268 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP) 5269 return (PF_DROP); 5270 } else { 5271 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason, 5272 ©back) == PF_DROP) 5273 return (PF_DROP); 5274 } 5275 5276 /* translate source/destination address, if necessary */ 5277 if (STATE_TRANSLATE(*state)) { 5278 if (direction == PF_OUT) 5279 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum, 5280 &th->th_sum, &(*state)->gwy.addr, 5281 (*state)->gwy.port, 0, pd->af); 5282 else 5283 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum, 5284 &th->th_sum, &(*state)->lan.addr, 5285 (*state)->lan.port, 0, pd->af); 5286 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5287 } else if (copyback) { 5288 /* Copyback sequence modulation or stateful scrub changes */ 5289 m_copyback(m, off, sizeof(*th), (caddr_t)th); 5290 } 5291 5292 return (PF_PASS); 5293} 5294 5295int 5296pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif, 5297 struct mbuf *m, int off, void *h, struct pf_pdesc *pd) 5298{ 5299 struct pf_state_peer *src, *dst; 5300 struct pf_state_cmp key; 5301 struct udphdr *uh = pd->hdr.udp; 5302 5303 key.af = pd->af; 5304 key.proto = IPPROTO_UDP; 5305 if (direction == PF_IN) { 5306 PF_ACPY(&key.ext.addr, pd->src, key.af); 5307 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5308 key.ext.port = uh->uh_sport; 5309 key.gwy.port = uh->uh_dport; 5310 } else { 5311 PF_ACPY(&key.lan.addr, pd->src, key.af); 5312 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5313 key.lan.port = uh->uh_sport; 5314 key.ext.port = uh->uh_dport; 5315 } 5316 5317 STATE_LOOKUP(); 5318 5319 if (direction == (*state)->direction) { 5320 src = &(*state)->src; 5321 dst = &(*state)->dst; 5322 } else { 5323 src = &(*state)->dst; 5324 dst = &(*state)->src; 5325 } 5326 5327 /* update states */ 5328 if (src->state < PFUDPS_SINGLE) 5329 src->state = PFUDPS_SINGLE; 5330 if (dst->state == PFUDPS_SINGLE) 5331 dst->state = PFUDPS_MULTIPLE; 5332 5333 /* update expire time */ 5334 (*state)->expire = time_second; 5335 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE) 5336 (*state)->timeout = PFTM_UDP_MULTIPLE; 5337 else 5338 (*state)->timeout = PFTM_UDP_SINGLE; 5339 5340 /* translate source/destination address, if necessary */ 5341 if (STATE_TRANSLATE(*state)) { 5342 if (direction == PF_OUT) 5343 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum, 5344 &uh->uh_sum, &(*state)->gwy.addr, 5345 (*state)->gwy.port, 1, pd->af); 5346 else 5347 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum, 5348 &uh->uh_sum, &(*state)->lan.addr, 5349 (*state)->lan.port, 1, pd->af); 5350 m_copyback(m, off, sizeof(*uh), (caddr_t)uh); 5351 } 5352 5353 return (PF_PASS); 5354} 5355 5356int 5357pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif, 5358 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason) 5359{ 5360 struct pf_addr *saddr = pd->src, *daddr = pd->dst; 5361 u_int16_t icmpid = 0; /* make the compiler happy */ 5362 u_int16_t *icmpsum = NULL; /* make the compiler happy */ 5363 u_int8_t icmptype = 0; /* make the compiler happy */ 5364 int state_icmp = 0; 5365 struct pf_state_cmp key; 5366 5367 switch (pd->proto) { 5368#ifdef INET 5369 case IPPROTO_ICMP: 5370 icmptype = pd->hdr.icmp->icmp_type; 5371 icmpid = pd->hdr.icmp->icmp_id; 5372 icmpsum = &pd->hdr.icmp->icmp_cksum; 5373 5374 if (icmptype == ICMP_UNREACH || 5375 icmptype == ICMP_SOURCEQUENCH || 5376 icmptype == ICMP_REDIRECT || 5377 icmptype == ICMP_TIMXCEED || 5378 icmptype == ICMP_PARAMPROB) 5379 state_icmp++; 5380 break; 5381#endif /* INET */ 5382#ifdef INET6 5383 case IPPROTO_ICMPV6: 5384 icmptype = pd->hdr.icmp6->icmp6_type; 5385 icmpid = pd->hdr.icmp6->icmp6_id; 5386 icmpsum = &pd->hdr.icmp6->icmp6_cksum; 5387 5388 if (icmptype == ICMP6_DST_UNREACH || 5389 icmptype == ICMP6_PACKET_TOO_BIG || 5390 icmptype == ICMP6_TIME_EXCEEDED || 5391 icmptype == ICMP6_PARAM_PROB) 5392 state_icmp++; 5393 break; 5394#endif /* INET6 */ 5395 } 5396 5397 if (!state_icmp) { 5398 5399 /* 5400 * ICMP query/reply message not related to a TCP/UDP packet. 5401 * Search for an ICMP state. 5402 */ 5403 key.af = pd->af; 5404 key.proto = pd->proto; 5405 if (direction == PF_IN) { 5406 PF_ACPY(&key.ext.addr, pd->src, key.af); 5407 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5408 key.ext.port = 0; 5409 key.gwy.port = icmpid; 5410 } else { 5411 PF_ACPY(&key.lan.addr, pd->src, key.af); 5412 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5413 key.lan.port = icmpid; 5414 key.ext.port = 0; 5415 } 5416 5417 STATE_LOOKUP(); 5418 5419 (*state)->expire = time_second; 5420 (*state)->timeout = PFTM_ICMP_ERROR_REPLY; 5421 5422 /* translate source/destination address, if necessary */ 5423 if (STATE_TRANSLATE(*state)) { 5424 if (direction == PF_OUT) { 5425 switch (pd->af) { 5426#ifdef INET 5427 case AF_INET: 5428 pf_change_a(&saddr->v4.s_addr, 5429 pd->ip_sum, 5430 (*state)->gwy.addr.v4.s_addr, 0); 5431 pd->hdr.icmp->icmp_cksum = 5432 pf_cksum_fixup( 5433 pd->hdr.icmp->icmp_cksum, icmpid, 5434 (*state)->gwy.port, 0); 5435 pd->hdr.icmp->icmp_id = 5436 (*state)->gwy.port; 5437 m_copyback(m, off, ICMP_MINLEN, 5438 (caddr_t)pd->hdr.icmp); 5439 break; 5440#endif /* INET */ 5441#ifdef INET6 5442 case AF_INET6: 5443 pf_change_a6(saddr, 5444 &pd->hdr.icmp6->icmp6_cksum, 5445 &(*state)->gwy.addr, 0); 5446 m_copyback(m, off, 5447 sizeof(struct icmp6_hdr), 5448 (caddr_t)pd->hdr.icmp6); 5449 break; 5450#endif /* INET6 */ 5451 } 5452 } else { 5453 switch (pd->af) { 5454#ifdef INET 5455 case AF_INET: 5456 pf_change_a(&daddr->v4.s_addr, 5457 pd->ip_sum, 5458 (*state)->lan.addr.v4.s_addr, 0); 5459 pd->hdr.icmp->icmp_cksum = 5460 pf_cksum_fixup( 5461 pd->hdr.icmp->icmp_cksum, icmpid, 5462 (*state)->lan.port, 0); 5463 pd->hdr.icmp->icmp_id = 5464 (*state)->lan.port; 5465 m_copyback(m, off, ICMP_MINLEN, 5466 (caddr_t)pd->hdr.icmp); 5467 break; 5468#endif /* INET */ 5469#ifdef INET6 5470 case AF_INET6: 5471 pf_change_a6(daddr, 5472 &pd->hdr.icmp6->icmp6_cksum, 5473 &(*state)->lan.addr, 0); 5474 m_copyback(m, off, 5475 sizeof(struct icmp6_hdr), 5476 (caddr_t)pd->hdr.icmp6); 5477 break; 5478#endif /* INET6 */ 5479 } 5480 } 5481 } 5482 5483 return (PF_PASS); 5484 5485 } else { 5486 /* 5487 * ICMP error message in response to a TCP/UDP packet. 5488 * Extract the inner TCP/UDP header and search for that state. 5489 */ 5490 5491 struct pf_pdesc pd2; 5492#ifdef INET 5493 struct ip h2; 5494#endif /* INET */ 5495#ifdef INET6 5496 struct ip6_hdr h2_6; 5497 int terminal = 0; 5498#endif /* INET6 */ 5499 int ipoff2 = 0; /* make the compiler happy */ 5500 int off2 = 0; /* make the compiler happy */ 5501 5502 pd2.af = pd->af; 5503 switch (pd->af) { 5504#ifdef INET 5505 case AF_INET: 5506 /* offset of h2 in mbuf chain */ 5507 ipoff2 = off + ICMP_MINLEN; 5508 5509 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2), 5510 NULL, reason, pd2.af)) { 5511 DPFPRINTF(PF_DEBUG_MISC, 5512 ("pf: ICMP error message too short " 5513 "(ip)\n")); 5514 return (PF_DROP); 5515 } 5516 /* 5517 * ICMP error messages don't refer to non-first 5518 * fragments 5519 */ 5520 if (h2.ip_off & htons(IP_OFFMASK)) { 5521 REASON_SET(reason, PFRES_FRAG); 5522 return (PF_DROP); 5523 } 5524 5525 /* offset of protocol header that follows h2 */ 5526 off2 = ipoff2 + (h2.ip_hl << 2); 5527 5528 pd2.proto = h2.ip_p; 5529 pd2.src = (struct pf_addr *)&h2.ip_src; 5530 pd2.dst = (struct pf_addr *)&h2.ip_dst; 5531 pd2.ip_sum = &h2.ip_sum; 5532 break; 5533#endif /* INET */ 5534#ifdef INET6 5535 case AF_INET6: 5536 ipoff2 = off + sizeof(struct icmp6_hdr); 5537 5538 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6), 5539 NULL, reason, pd2.af)) { 5540 DPFPRINTF(PF_DEBUG_MISC, 5541 ("pf: ICMP error message too short " 5542 "(ip6)\n")); 5543 return (PF_DROP); 5544 } 5545 pd2.proto = h2_6.ip6_nxt; 5546 pd2.src = (struct pf_addr *)&h2_6.ip6_src; 5547 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst; 5548 pd2.ip_sum = NULL; 5549 off2 = ipoff2 + sizeof(h2_6); 5550 do { 5551 switch (pd2.proto) { 5552 case IPPROTO_FRAGMENT: 5553 /* 5554 * ICMPv6 error messages for 5555 * non-first fragments 5556 */ 5557 REASON_SET(reason, PFRES_FRAG); 5558 return (PF_DROP); 5559 case IPPROTO_AH: 5560 case IPPROTO_HOPOPTS: 5561 case IPPROTO_ROUTING: 5562 case IPPROTO_DSTOPTS: { 5563 /* get next header and header length */ 5564 struct ip6_ext opt6; 5565 5566 if (!pf_pull_hdr(m, off2, &opt6, 5567 sizeof(opt6), NULL, reason, 5568 pd2.af)) { 5569 DPFPRINTF(PF_DEBUG_MISC, 5570 ("pf: ICMPv6 short opt\n")); 5571 return (PF_DROP); 5572 } 5573 if (pd2.proto == IPPROTO_AH) 5574 off2 += (opt6.ip6e_len + 2) * 4; 5575 else 5576 off2 += (opt6.ip6e_len + 1) * 8; 5577 pd2.proto = opt6.ip6e_nxt; 5578 /* goto the next header */ 5579 break; 5580 } 5581 default: 5582 terminal++; 5583 break; 5584 } 5585 } while (!terminal); 5586 break; 5587#endif /* INET6 */ 5588#ifdef __FreeBSD__ 5589 default: 5590 panic("AF not supported: %d", pd->af); 5591#endif 5592 } 5593 5594 switch (pd2.proto) { 5595 case IPPROTO_TCP: { 5596 struct tcphdr th; 5597 u_int32_t seq; 5598 struct pf_state_peer *src, *dst; 5599 u_int8_t dws; 5600 int copyback = 0; 5601 5602 /* 5603 * Only the first 8 bytes of the TCP header can be 5604 * expected. Don't access any TCP header fields after 5605 * th_seq, an ackskew test is not possible. 5606 */ 5607 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason, 5608 pd2.af)) { 5609 DPFPRINTF(PF_DEBUG_MISC, 5610 ("pf: ICMP error message too short " 5611 "(tcp)\n")); 5612 return (PF_DROP); 5613 } 5614 5615 key.af = pd2.af; 5616 key.proto = IPPROTO_TCP; 5617 if (direction == PF_IN) { 5618 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5619 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5620 key.ext.port = th.th_dport; 5621 key.gwy.port = th.th_sport; 5622 } else { 5623 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5624 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5625 key.lan.port = th.th_dport; 5626 key.ext.port = th.th_sport; 5627 } 5628 5629 STATE_LOOKUP(); 5630 5631 if (direction == (*state)->direction) { 5632 src = &(*state)->dst; 5633 dst = &(*state)->src; 5634 } else { 5635 src = &(*state)->src; 5636 dst = &(*state)->dst; 5637 } 5638 5639 if (src->wscale && dst->wscale) 5640 dws = dst->wscale & PF_WSCALE_MASK; 5641 else 5642 dws = 0; 5643 5644 /* Demodulate sequence number */ 5645 seq = ntohl(th.th_seq) - src->seqdiff; 5646 if (src->seqdiff) { 5647 pf_change_a(&th.th_seq, icmpsum, 5648 htonl(seq), 0); 5649 copyback = 1; 5650 } 5651 5652 if (!((*state)->state_flags & PFSTATE_SLOPPY) && 5653 (!SEQ_GEQ(src->seqhi, seq) || 5654 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) { 5655 if (pf_status.debug >= PF_DEBUG_MISC) { 5656 printf("pf: BAD ICMP %d:%d ", 5657 icmptype, pd->hdr.icmp->icmp_code); 5658 pf_print_host(pd->src, 0, pd->af); 5659 printf(" -> "); 5660 pf_print_host(pd->dst, 0, pd->af); 5661 printf(" state: "); 5662 pf_print_state(*state); 5663 printf(" seq=%u\n", seq); 5664 } 5665 REASON_SET(reason, PFRES_BADSTATE); 5666 return (PF_DROP); 5667 } 5668 5669 if (STATE_TRANSLATE(*state)) { 5670 if (direction == PF_IN) { 5671 pf_change_icmp(pd2.src, &th.th_sport, 5672 daddr, &(*state)->lan.addr, 5673 (*state)->lan.port, NULL, 5674 pd2.ip_sum, icmpsum, 5675 pd->ip_sum, 0, pd2.af); 5676 } else { 5677 pf_change_icmp(pd2.dst, &th.th_dport, 5678 saddr, &(*state)->gwy.addr, 5679 (*state)->gwy.port, NULL, 5680 pd2.ip_sum, icmpsum, 5681 pd->ip_sum, 0, pd2.af); 5682 } 5683 copyback = 1; 5684 } 5685 5686 if (copyback) { 5687 switch (pd2.af) { 5688#ifdef INET 5689 case AF_INET: 5690 m_copyback(m, off, ICMP_MINLEN, 5691 (caddr_t)pd->hdr.icmp); 5692 m_copyback(m, ipoff2, sizeof(h2), 5693 (caddr_t)&h2); 5694 break; 5695#endif /* INET */ 5696#ifdef INET6 5697 case AF_INET6: 5698 m_copyback(m, off, 5699 sizeof(struct icmp6_hdr), 5700 (caddr_t)pd->hdr.icmp6); 5701 m_copyback(m, ipoff2, sizeof(h2_6), 5702 (caddr_t)&h2_6); 5703 break; 5704#endif /* INET6 */ 5705 } 5706 m_copyback(m, off2, 8, (caddr_t)&th); 5707 } 5708 5709 return (PF_PASS); 5710 break; 5711 } 5712 case IPPROTO_UDP: { 5713 struct udphdr uh; 5714 5715 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh), 5716 NULL, reason, pd2.af)) { 5717 DPFPRINTF(PF_DEBUG_MISC, 5718 ("pf: ICMP error message too short " 5719 "(udp)\n")); 5720 return (PF_DROP); 5721 } 5722 5723 key.af = pd2.af; 5724 key.proto = IPPROTO_UDP; 5725 if (direction == PF_IN) { 5726 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5727 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5728 key.ext.port = uh.uh_dport; 5729 key.gwy.port = uh.uh_sport; 5730 } else { 5731 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5732 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5733 key.lan.port = uh.uh_dport; 5734 key.ext.port = uh.uh_sport; 5735 } 5736 5737 STATE_LOOKUP(); 5738 5739 if (STATE_TRANSLATE(*state)) { 5740 if (direction == PF_IN) { 5741 pf_change_icmp(pd2.src, &uh.uh_sport, 5742 daddr, &(*state)->lan.addr, 5743 (*state)->lan.port, &uh.uh_sum, 5744 pd2.ip_sum, icmpsum, 5745 pd->ip_sum, 1, pd2.af); 5746 } else { 5747 pf_change_icmp(pd2.dst, &uh.uh_dport, 5748 saddr, &(*state)->gwy.addr, 5749 (*state)->gwy.port, &uh.uh_sum, 5750 pd2.ip_sum, icmpsum, 5751 pd->ip_sum, 1, pd2.af); 5752 } 5753 switch (pd2.af) { 5754#ifdef INET 5755 case AF_INET: 5756 m_copyback(m, off, ICMP_MINLEN, 5757 (caddr_t)pd->hdr.icmp); 5758 m_copyback(m, ipoff2, sizeof(h2), 5759 (caddr_t)&h2); 5760 break; 5761#endif /* INET */ 5762#ifdef INET6 5763 case AF_INET6: 5764 m_copyback(m, off, 5765 sizeof(struct icmp6_hdr), 5766 (caddr_t)pd->hdr.icmp6); 5767 m_copyback(m, ipoff2, sizeof(h2_6), 5768 (caddr_t)&h2_6); 5769 break; 5770#endif /* INET6 */ 5771 } 5772 m_copyback(m, off2, sizeof(uh), 5773 (caddr_t)&uh); 5774 } 5775 5776 return (PF_PASS); 5777 break; 5778 } 5779#ifdef INET 5780 case IPPROTO_ICMP: { 5781 struct icmp iih; 5782 5783 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN, 5784 NULL, reason, pd2.af)) { 5785 DPFPRINTF(PF_DEBUG_MISC, 5786 ("pf: ICMP error message too short i" 5787 "(icmp)\n")); 5788 return (PF_DROP); 5789 } 5790 5791 key.af = pd2.af; 5792 key.proto = IPPROTO_ICMP; 5793 if (direction == PF_IN) { 5794 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5795 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5796 key.ext.port = 0; 5797 key.gwy.port = iih.icmp_id; 5798 } else { 5799 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5800 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5801 key.lan.port = iih.icmp_id; 5802 key.ext.port = 0; 5803 } 5804 5805 STATE_LOOKUP(); 5806 5807 if (STATE_TRANSLATE(*state)) { 5808 if (direction == PF_IN) { 5809 pf_change_icmp(pd2.src, &iih.icmp_id, 5810 daddr, &(*state)->lan.addr, 5811 (*state)->lan.port, NULL, 5812 pd2.ip_sum, icmpsum, 5813 pd->ip_sum, 0, AF_INET); 5814 } else { 5815 pf_change_icmp(pd2.dst, &iih.icmp_id, 5816 saddr, &(*state)->gwy.addr, 5817 (*state)->gwy.port, NULL, 5818 pd2.ip_sum, icmpsum, 5819 pd->ip_sum, 0, AF_INET); 5820 } 5821 m_copyback(m, off, ICMP_MINLEN, 5822 (caddr_t)pd->hdr.icmp); 5823 m_copyback(m, ipoff2, sizeof(h2), 5824 (caddr_t)&h2); 5825 m_copyback(m, off2, ICMP_MINLEN, 5826 (caddr_t)&iih); 5827 } 5828 5829 return (PF_PASS); 5830 break; 5831 } 5832#endif /* INET */ 5833#ifdef INET6 5834 case IPPROTO_ICMPV6: { 5835 struct icmp6_hdr iih; 5836 5837 if (!pf_pull_hdr(m, off2, &iih, 5838 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) { 5839 DPFPRINTF(PF_DEBUG_MISC, 5840 ("pf: ICMP error message too short " 5841 "(icmp6)\n")); 5842 return (PF_DROP); 5843 } 5844 5845 key.af = pd2.af; 5846 key.proto = IPPROTO_ICMPV6; 5847 if (direction == PF_IN) { 5848 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5849 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5850 key.ext.port = 0; 5851 key.gwy.port = iih.icmp6_id; 5852 } else { 5853 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5854 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5855 key.lan.port = iih.icmp6_id; 5856 key.ext.port = 0; 5857 } 5858 5859 STATE_LOOKUP(); 5860 5861 if (STATE_TRANSLATE(*state)) { 5862 if (direction == PF_IN) { 5863 pf_change_icmp(pd2.src, &iih.icmp6_id, 5864 daddr, &(*state)->lan.addr, 5865 (*state)->lan.port, NULL, 5866 pd2.ip_sum, icmpsum, 5867 pd->ip_sum, 0, AF_INET6); 5868 } else { 5869 pf_change_icmp(pd2.dst, &iih.icmp6_id, 5870 saddr, &(*state)->gwy.addr, 5871 (*state)->gwy.port, NULL, 5872 pd2.ip_sum, icmpsum, 5873 pd->ip_sum, 0, AF_INET6); 5874 } 5875 m_copyback(m, off, sizeof(struct icmp6_hdr), 5876 (caddr_t)pd->hdr.icmp6); 5877 m_copyback(m, ipoff2, sizeof(h2_6), 5878 (caddr_t)&h2_6); 5879 m_copyback(m, off2, sizeof(struct icmp6_hdr), 5880 (caddr_t)&iih); 5881 } 5882 5883 return (PF_PASS); 5884 break; 5885 } 5886#endif /* INET6 */ 5887 default: { 5888 key.af = pd2.af; 5889 key.proto = pd2.proto; 5890 if (direction == PF_IN) { 5891 PF_ACPY(&key.ext.addr, pd2.dst, key.af); 5892 PF_ACPY(&key.gwy.addr, pd2.src, key.af); 5893 key.ext.port = 0; 5894 key.gwy.port = 0; 5895 } else { 5896 PF_ACPY(&key.lan.addr, pd2.dst, key.af); 5897 PF_ACPY(&key.ext.addr, pd2.src, key.af); 5898 key.lan.port = 0; 5899 key.ext.port = 0; 5900 } 5901 5902 STATE_LOOKUP(); 5903 5904 if (STATE_TRANSLATE(*state)) { 5905 if (direction == PF_IN) { 5906 pf_change_icmp(pd2.src, NULL, 5907 daddr, &(*state)->lan.addr, 5908 0, NULL, 5909 pd2.ip_sum, icmpsum, 5910 pd->ip_sum, 0, pd2.af); 5911 } else { 5912 pf_change_icmp(pd2.dst, NULL, 5913 saddr, &(*state)->gwy.addr, 5914 0, NULL, 5915 pd2.ip_sum, icmpsum, 5916 pd->ip_sum, 0, pd2.af); 5917 } 5918 switch (pd2.af) { 5919#ifdef INET 5920 case AF_INET: 5921 m_copyback(m, off, ICMP_MINLEN, 5922 (caddr_t)pd->hdr.icmp); 5923 m_copyback(m, ipoff2, sizeof(h2), 5924 (caddr_t)&h2); 5925 break; 5926#endif /* INET */ 5927#ifdef INET6 5928 case AF_INET6: 5929 m_copyback(m, off, 5930 sizeof(struct icmp6_hdr), 5931 (caddr_t)pd->hdr.icmp6); 5932 m_copyback(m, ipoff2, sizeof(h2_6), 5933 (caddr_t)&h2_6); 5934 break; 5935#endif /* INET6 */ 5936 } 5937 } 5938 5939 return (PF_PASS); 5940 break; 5941 } 5942 } 5943 } 5944} 5945 5946int 5947pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif, 5948 struct pf_pdesc *pd) 5949{ 5950 struct pf_state_peer *src, *dst; 5951 struct pf_state_cmp key; 5952 5953 key.af = pd->af; 5954 key.proto = pd->proto; 5955 if (direction == PF_IN) { 5956 PF_ACPY(&key.ext.addr, pd->src, key.af); 5957 PF_ACPY(&key.gwy.addr, pd->dst, key.af); 5958 key.ext.port = 0; 5959 key.gwy.port = 0; 5960 } else { 5961 PF_ACPY(&key.lan.addr, pd->src, key.af); 5962 PF_ACPY(&key.ext.addr, pd->dst, key.af); 5963 key.lan.port = 0; 5964 key.ext.port = 0; 5965 } 5966 5967 STATE_LOOKUP(); 5968 5969 if (direction == (*state)->direction) { 5970 src = &(*state)->src; 5971 dst = &(*state)->dst; 5972 } else { 5973 src = &(*state)->dst; 5974 dst = &(*state)->src; 5975 } 5976 5977 /* update states */ 5978 if (src->state < PFOTHERS_SINGLE) 5979 src->state = PFOTHERS_SINGLE; 5980 if (dst->state == PFOTHERS_SINGLE) 5981 dst->state = PFOTHERS_MULTIPLE; 5982 5983 /* update expire time */ 5984 (*state)->expire = time_second; 5985 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE) 5986 (*state)->timeout = PFTM_OTHER_MULTIPLE; 5987 else 5988 (*state)->timeout = PFTM_OTHER_SINGLE; 5989 5990 /* translate source/destination address, if necessary */ 5991 if (STATE_TRANSLATE(*state)) { 5992 if (direction == PF_OUT) 5993 switch (pd->af) { 5994#ifdef INET 5995 case AF_INET: 5996 pf_change_a(&pd->src->v4.s_addr, 5997 pd->ip_sum, (*state)->gwy.addr.v4.s_addr, 5998 0); 5999 break; 6000#endif /* INET */ 6001#ifdef INET6 6002 case AF_INET6: 6003 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af); 6004 break; 6005#endif /* INET6 */ 6006 } 6007 else 6008 switch (pd->af) { 6009#ifdef INET 6010 case AF_INET: 6011 pf_change_a(&pd->dst->v4.s_addr, 6012 pd->ip_sum, (*state)->lan.addr.v4.s_addr, 6013 0); 6014 break; 6015#endif /* INET */ 6016#ifdef INET6 6017 case AF_INET6: 6018 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af); 6019 break; 6020#endif /* INET6 */ 6021 } 6022 } 6023 6024 return (PF_PASS); 6025} 6026 6027/* 6028 * ipoff and off are measured from the start of the mbuf chain. 6029 * h must be at "ipoff" on the mbuf chain. 6030 */ 6031void * 6032pf_pull_hdr(struct mbuf *m, int off, void *p, int len, 6033 u_short *actionp, u_short *reasonp, sa_family_t af) 6034{ 6035 switch (af) { 6036#ifdef INET 6037 case AF_INET: { 6038 struct ip *h = mtod(m, struct ip *); 6039 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3; 6040 6041 if (fragoff) { 6042 if (fragoff >= len) 6043 ACTION_SET(actionp, PF_PASS); 6044 else { 6045 ACTION_SET(actionp, PF_DROP); 6046 REASON_SET(reasonp, PFRES_FRAG); 6047 } 6048 return (NULL); 6049 } 6050 if (m->m_pkthdr.len < off + len || 6051 ntohs(h->ip_len) < off + len) { 6052 ACTION_SET(actionp, PF_DROP); 6053 REASON_SET(reasonp, PFRES_SHORT); 6054 return (NULL); 6055 } 6056 break; 6057 } 6058#endif /* INET */ 6059#ifdef INET6 6060 case AF_INET6: { 6061 struct ip6_hdr *h = mtod(m, struct ip6_hdr *); 6062 6063 if (m->m_pkthdr.len < off + len || 6064 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) < 6065 (unsigned)(off + len)) { 6066 ACTION_SET(actionp, PF_DROP); 6067 REASON_SET(reasonp, PFRES_SHORT); 6068 return (NULL); 6069 } 6070 break; 6071 } 6072#endif /* INET6 */ 6073 } 6074 m_copydata(m, off, len, p); 6075 return (p); 6076} 6077 6078int 6079pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif) 6080{ 6081 struct sockaddr_in *dst; 6082 int ret = 1; 6083 int check_mpath; 6084#ifndef __FreeBSD__ 6085 extern int ipmultipath; 6086#endif 6087#ifdef INET6 6088#ifndef __FreeBSD__ 6089 extern int ip6_multipath; 6090#endif 6091 struct sockaddr_in6 *dst6; 6092 struct route_in6 ro; 6093#else 6094 struct route ro; 6095#endif 6096 struct radix_node *rn; 6097 struct rtentry *rt; 6098 struct ifnet *ifp; 6099 6100 check_mpath = 0; 6101 bzero(&ro, sizeof(ro)); 6102 switch (af) { 6103 case AF_INET: 6104 dst = satosin(&ro.ro_dst); 6105 dst->sin_family = AF_INET; 6106 dst->sin_len = sizeof(*dst); 6107 dst->sin_addr = addr->v4; 6108#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 6109 if (ipmultipath) 6110 check_mpath = 1; 6111#endif 6112 break; 6113#ifdef INET6 6114 case AF_INET6: 6115 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 6116 dst6->sin6_family = AF_INET6; 6117 dst6->sin6_len = sizeof(*dst6); 6118 dst6->sin6_addr = addr->v6; 6119#ifndef __FreeBSD__ /* MULTIPATH_ROUTING */ 6120 if (ip6_multipath) 6121 check_mpath = 1; 6122#endif 6123 break; 6124#endif /* INET6 */ 6125 default: 6126 return (0); 6127 } 6128 6129 /* Skip checks for ipsec interfaces */ 6130 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC) 6131 goto out; 6132 6133#ifdef __FreeBSD__ 6134/* XXX MRT not always INET */ /* stick with table 0 though */ 6135#ifdef INET 6136 if (af == AF_INET) 6137 in_rtalloc_ign((struct route *)&ro, 0, 0); 6138 else 6139#endif 6140 rtalloc_ign((struct route *)&ro, 0); 6141#else /* ! __FreeBSD__ */ 6142 rtalloc_noclone((struct route *)&ro, NO_CLONING); 6143#endif 6144 6145 if (ro.ro_rt != NULL) { 6146 /* No interface given, this is a no-route check */ 6147 if (kif == NULL) 6148 goto out; 6149 6150 if (kif->pfik_ifp == NULL) { 6151 ret = 0; 6152 goto out; 6153 } 6154 6155 /* Perform uRPF check if passed input interface */ 6156 ret = 0; 6157 rn = (struct radix_node *)ro.ro_rt; 6158 do { 6159 rt = (struct rtentry *)rn; 6160#ifndef __FreeBSD__ /* CARPDEV */ 6161 if (rt->rt_ifp->if_type == IFT_CARP) 6162 ifp = rt->rt_ifp->if_carpdev; 6163 else 6164#endif 6165 ifp = rt->rt_ifp; 6166 6167 if (kif->pfik_ifp == ifp) 6168 ret = 1; 6169#ifdef __FreeBSD__ /* MULTIPATH_ROUTING */ 6170 rn = NULL; 6171#else 6172 rn = rn_mpath_next(rn); 6173#endif 6174 } while (check_mpath == 1 && rn != NULL && ret == 0); 6175 } else 6176 ret = 0; 6177out: 6178 if (ro.ro_rt != NULL) 6179 RTFREE(ro.ro_rt); 6180 return (ret); 6181} 6182 6183int 6184pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw) 6185{ 6186 struct sockaddr_in *dst; 6187#ifdef INET6 6188 struct sockaddr_in6 *dst6; 6189 struct route_in6 ro; 6190#else 6191 struct route ro; 6192#endif 6193 int ret = 0; 6194 6195 bzero(&ro, sizeof(ro)); 6196 switch (af) { 6197 case AF_INET: 6198 dst = satosin(&ro.ro_dst); 6199 dst->sin_family = AF_INET; 6200 dst->sin_len = sizeof(*dst); 6201 dst->sin_addr = addr->v4; 6202 break; 6203#ifdef INET6 6204 case AF_INET6: 6205 dst6 = (struct sockaddr_in6 *)&ro.ro_dst; 6206 dst6->sin6_family = AF_INET6; 6207 dst6->sin6_len = sizeof(*dst6); 6208 dst6->sin6_addr = addr->v6; 6209 break; 6210#endif /* INET6 */ 6211 default: 6212 return (0); 6213 } 6214 6215#ifdef __FreeBSD__ 6216# ifdef RTF_PRCLONING 6217 rtalloc_ign((struct route *)&ro, (RTF_CLONING|RTF_PRCLONING)); 6218# else /* !RTF_PRCLONING */ 6219#ifdef INET 6220 if (af == AF_INET) 6221 in_rtalloc_ign((struct route *)&ro, 0, 0); 6222 else 6223#endif 6224 rtalloc_ign((struct route *)&ro, 0); 6225# endif 6226#else /* ! __FreeBSD__ */ 6227 rtalloc_noclone((struct route *)&ro, NO_CLONING); 6228#endif 6229 6230 if (ro.ro_rt != NULL) { 6231#ifdef __FreeBSD__ 6232 /* XXX_IMPORT: later */ 6233#else 6234 if (ro.ro_rt->rt_labelid == aw->v.rtlabel) 6235 ret = 1; 6236#endif 6237 RTFREE(ro.ro_rt); 6238 } 6239 6240 return (ret); 6241} 6242 6243#ifdef INET 6244 6245void 6246pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6247 struct pf_state *s, struct pf_pdesc *pd) 6248{ 6249 struct mbuf *m0, *m1; 6250 struct route iproute; 6251 struct route *ro = NULL; 6252 struct sockaddr_in *dst; 6253 struct ip *ip; 6254 struct ifnet *ifp = NULL; 6255 struct pf_addr naddr; 6256 struct pf_src_node *sn = NULL; 6257 int error = 0; 6258#ifdef __FreeBSD__ 6259 int sw_csum; 6260#endif 6261#ifdef IPSEC 6262 struct m_tag *mtag; 6263#endif /* IPSEC */ 6264 6265 if (m == NULL || *m == NULL || r == NULL || 6266 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6267 panic("pf_route: invalid parameters"); 6268 6269 if (pd->pf_mtag->routed++ > 3) { 6270 m0 = *m; 6271 *m = NULL; 6272 goto bad; 6273 } 6274 6275 if (r->rt == PF_DUPTO) { 6276#ifdef __FreeBSD__ 6277 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6278#else 6279 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6280#endif 6281 return; 6282 } else { 6283 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6284 return; 6285 m0 = *m; 6286 } 6287 6288 if (m0->m_len < sizeof(struct ip)) { 6289 DPFPRINTF(PF_DEBUG_URGENT, 6290 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6291 goto bad; 6292 } 6293 6294 ip = mtod(m0, struct ip *); 6295 6296 ro = &iproute; 6297 bzero((caddr_t)ro, sizeof(*ro)); 6298 dst = satosin(&ro->ro_dst); 6299 dst->sin_family = AF_INET; 6300 dst->sin_len = sizeof(*dst); 6301 dst->sin_addr = ip->ip_dst; 6302 6303 if (r->rt == PF_FASTROUTE) { 6304 in_rtalloc(ro, 0); 6305 if (ro->ro_rt == 0) { 6306 KMOD_IPSTAT_INC(ips_noroute); 6307 goto bad; 6308 } 6309 6310 ifp = ro->ro_rt->rt_ifp; 6311 ro->ro_rt->rt_use++; 6312 6313 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 6314 dst = satosin(ro->ro_rt->rt_gateway); 6315 } else { 6316 if (TAILQ_EMPTY(&r->rpool.list)) { 6317 DPFPRINTF(PF_DEBUG_URGENT, 6318 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n")); 6319 goto bad; 6320 } 6321 if (s == NULL) { 6322 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src, 6323 &naddr, NULL, &sn); 6324 if (!PF_AZERO(&naddr, AF_INET)) 6325 dst->sin_addr.s_addr = naddr.v4.s_addr; 6326 ifp = r->rpool.cur->kif ? 6327 r->rpool.cur->kif->pfik_ifp : NULL; 6328 } else { 6329 if (!PF_AZERO(&s->rt_addr, AF_INET)) 6330 dst->sin_addr.s_addr = 6331 s->rt_addr.v4.s_addr; 6332 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6333 } 6334 } 6335 if (ifp == NULL) 6336 goto bad; 6337 6338 if (oifp != ifp) { 6339#ifdef __FreeBSD__ 6340 PF_UNLOCK(); 6341 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6342 PF_LOCK(); 6343 goto bad; 6344 } else if (m0 == NULL) { 6345 PF_LOCK(); 6346 goto done; 6347 } 6348 PF_LOCK(); 6349#else 6350 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6351 goto bad; 6352 else if (m0 == NULL) 6353 goto done; 6354#endif 6355 if (m0->m_len < sizeof(struct ip)) { 6356 DPFPRINTF(PF_DEBUG_URGENT, 6357 ("pf_route: m0->m_len < sizeof(struct ip)\n")); 6358 goto bad; 6359 } 6360 ip = mtod(m0, struct ip *); 6361 } 6362 6363#ifdef __FreeBSD__ 6364 /* Copied from FreeBSD 5.1-CURRENT ip_output. */ 6365 m0->m_pkthdr.csum_flags |= CSUM_IP; 6366 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist; 6367 if (sw_csum & CSUM_DELAY_DATA) { 6368 /* 6369 * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least) 6370 */ 6371 NTOHS(ip->ip_len); 6372 NTOHS(ip->ip_off); /* XXX: needed? */ 6373 in_delayed_cksum(m0); 6374 HTONS(ip->ip_len); 6375 HTONS(ip->ip_off); 6376 sw_csum &= ~CSUM_DELAY_DATA; 6377 } 6378 m0->m_pkthdr.csum_flags &= ifp->if_hwassist; 6379 6380 if (ntohs(ip->ip_len) <= ifp->if_mtu || 6381 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 6382 (ifp->if_hwassist & CSUM_FRAGMENT && 6383 ((ip->ip_off & htons(IP_DF)) == 0))) { 6384 /* 6385 * ip->ip_len = htons(ip->ip_len); 6386 * ip->ip_off = htons(ip->ip_off); 6387 */ 6388 ip->ip_sum = 0; 6389 if (sw_csum & CSUM_DELAY_IP) { 6390 /* From KAME */ 6391 if (ip->ip_v == IPVERSION && 6392 (ip->ip_hl << 2) == sizeof(*ip)) { 6393 ip->ip_sum = in_cksum_hdr(ip); 6394 } else { 6395 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6396 } 6397 } 6398 PF_UNLOCK(); 6399 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro); 6400 PF_LOCK(); 6401 goto done; 6402 } 6403 6404#else 6405 /* Copied from ip_output. */ 6406#ifdef IPSEC 6407 /* 6408 * If deferred crypto processing is needed, check that the 6409 * interface supports it. 6410 */ 6411 if ((mtag = m_tag_find(m0, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL)) 6412 != NULL && (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 6413 /* Notify IPsec to do its own crypto. */ 6414 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 6415 goto bad; 6416 } 6417#endif /* IPSEC */ 6418 6419 /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */ 6420 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) { 6421 if (!(ifp->if_capabilities & IFCAP_CSUM_TCPv4) || 6422 ifp->if_bridge != NULL) { 6423 in_delayed_cksum(m0); 6424 m0->m_pkthdr.csum_flags &= ~M_TCPV4_CSUM_OUT; /* Clear */ 6425 } 6426 } else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) { 6427 if (!(ifp->if_capabilities & IFCAP_CSUM_UDPv4) || 6428 ifp->if_bridge != NULL) { 6429 in_delayed_cksum(m0); 6430 m0->m_pkthdr.csum_flags &= ~M_UDPV4_CSUM_OUT; /* Clear */ 6431 } 6432 } 6433 6434 if (ntohs(ip->ip_len) <= ifp->if_mtu) { 6435 if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) && 6436 ifp->if_bridge == NULL) { 6437 m0->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; 6438 KMOD_IPSTAT_INC(ips_outhwcsum); 6439 } else { 6440 ip->ip_sum = 0; 6441 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2); 6442 } 6443 /* Update relevant hardware checksum stats for TCP/UDP */ 6444 if (m0->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT) 6445 KMOD_TCPSTAT_INC(tcps_outhwcsum); 6446 else if (m0->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT) 6447 KMOD_UDPSTAT_INC(udps_outhwcsum); 6448 error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL); 6449 goto done; 6450 } 6451#endif 6452 /* 6453 * Too large for interface; fragment if possible. 6454 * Must be able to put at least 8 bytes per fragment. 6455 */ 6456 if (ip->ip_off & htons(IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) { 6457 KMOD_IPSTAT_INC(ips_cantfrag); 6458 if (r->rt != PF_DUPTO) { 6459#ifdef __FreeBSD__ 6460 /* icmp_error() expects host byte ordering */ 6461 NTOHS(ip->ip_len); 6462 NTOHS(ip->ip_off); 6463 PF_UNLOCK(); 6464 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6465 ifp->if_mtu); 6466 PF_LOCK(); 6467#else 6468 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, 6469 ifp->if_mtu); 6470#endif 6471 goto done; 6472 } else 6473 goto bad; 6474 } 6475 6476 m1 = m0; 6477#ifdef __FreeBSD__ 6478 /* 6479 * XXX: is cheaper + less error prone than own function 6480 */ 6481 NTOHS(ip->ip_len); 6482 NTOHS(ip->ip_off); 6483 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum); 6484#else 6485 error = ip_fragment(m0, ifp, ifp->if_mtu); 6486#endif 6487 if (error) { 6488#ifndef __FreeBSD__ /* ip_fragment does not do m_freem() on FreeBSD */ 6489 m0 = NULL; 6490#endif 6491 goto bad; 6492 } 6493 6494 for (m0 = m1; m0; m0 = m1) { 6495 m1 = m0->m_nextpkt; 6496 m0->m_nextpkt = 0; 6497#ifdef __FreeBSD__ 6498 if (error == 0) { 6499 PF_UNLOCK(); 6500 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6501 NULL); 6502 PF_LOCK(); 6503 } else 6504#else 6505 if (error == 0) 6506 error = (*ifp->if_output)(ifp, m0, sintosa(dst), 6507 NULL); 6508 else 6509#endif 6510 m_freem(m0); 6511 } 6512 6513 if (error == 0) 6514 KMOD_IPSTAT_INC(ips_fragmented); 6515 6516done: 6517 if (r->rt != PF_DUPTO) 6518 *m = NULL; 6519 if (ro == &iproute && ro->ro_rt) 6520 RTFREE(ro->ro_rt); 6521 return; 6522 6523bad: 6524 m_freem(m0); 6525 goto done; 6526} 6527#endif /* INET */ 6528 6529#ifdef INET6 6530void 6531pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp, 6532 struct pf_state *s, struct pf_pdesc *pd) 6533{ 6534 struct mbuf *m0; 6535 struct route_in6 ip6route; 6536 struct route_in6 *ro; 6537 struct sockaddr_in6 *dst; 6538 struct ip6_hdr *ip6; 6539 struct ifnet *ifp = NULL; 6540 struct pf_addr naddr; 6541 struct pf_src_node *sn = NULL; 6542 int error = 0; 6543 6544 if (m == NULL || *m == NULL || r == NULL || 6545 (dir != PF_IN && dir != PF_OUT) || oifp == NULL) 6546 panic("pf_route6: invalid parameters"); 6547 6548 if (pd->pf_mtag->routed++ > 3) { 6549 m0 = *m; 6550 *m = NULL; 6551 goto bad; 6552 } 6553 6554 if (r->rt == PF_DUPTO) { 6555#ifdef __FreeBSD__ 6556 if ((m0 = m_dup(*m, M_DONTWAIT)) == NULL) 6557#else 6558 if ((m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT)) == NULL) 6559#endif 6560 return; 6561 } else { 6562 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) 6563 return; 6564 m0 = *m; 6565 } 6566 6567 if (m0->m_len < sizeof(struct ip6_hdr)) { 6568 DPFPRINTF(PF_DEBUG_URGENT, 6569 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6570 goto bad; 6571 } 6572 ip6 = mtod(m0, struct ip6_hdr *); 6573 6574 ro = &ip6route; 6575 bzero((caddr_t)ro, sizeof(*ro)); 6576 dst = (struct sockaddr_in6 *)&ro->ro_dst; 6577 dst->sin6_family = AF_INET6; 6578 dst->sin6_len = sizeof(*dst); 6579 dst->sin6_addr = ip6->ip6_dst; 6580 6581 /* Cheat. XXX why only in the v6 case??? */ 6582 if (r->rt == PF_FASTROUTE) { 6583#ifdef __FreeBSD__ 6584 m0->m_flags |= M_SKIP_FIREWALL; 6585 PF_UNLOCK(); 6586 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 6587 PF_LOCK(); 6588#else 6589 mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT); 6590 if (mtag == NULL) 6591 goto bad; 6592 m_tag_prepend(m0, mtag); 6593 pd->pf_mtag->flags |= PF_TAG_GENERATED; 6594 ip6_output(m0, NULL, NULL, 0, NULL, NULL); 6595#endif 6596 return; 6597 } 6598 6599 if (TAILQ_EMPTY(&r->rpool.list)) { 6600 DPFPRINTF(PF_DEBUG_URGENT, 6601 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n")); 6602 goto bad; 6603 } 6604 if (s == NULL) { 6605 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src, 6606 &naddr, NULL, &sn); 6607 if (!PF_AZERO(&naddr, AF_INET6)) 6608 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6609 &naddr, AF_INET6); 6610 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL; 6611 } else { 6612 if (!PF_AZERO(&s->rt_addr, AF_INET6)) 6613 PF_ACPY((struct pf_addr *)&dst->sin6_addr, 6614 &s->rt_addr, AF_INET6); 6615 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; 6616 } 6617 if (ifp == NULL) 6618 goto bad; 6619 6620 if (oifp != ifp) { 6621#ifdef __FreeBSD__ 6622 PF_UNLOCK(); 6623 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) { 6624 PF_LOCK(); 6625 goto bad; 6626 } else if (m0 == NULL) { 6627 PF_LOCK(); 6628 goto done; 6629 } 6630 PF_LOCK(); 6631#else 6632 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS) 6633 goto bad; 6634 else if (m0 == NULL) 6635 goto done; 6636#endif 6637 if (m0->m_len < sizeof(struct ip6_hdr)) { 6638 DPFPRINTF(PF_DEBUG_URGENT, 6639 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n")); 6640 goto bad; 6641 } 6642 ip6 = mtod(m0, struct ip6_hdr *); 6643 } 6644 6645 /* 6646 * If the packet is too large for the outgoing interface, 6647 * send back an icmp6 error. 6648 */ 6649 if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr)) 6650 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 6651 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) { 6652#ifdef __FreeBSD__ 6653 PF_UNLOCK(); 6654#endif 6655 error = nd6_output(ifp, ifp, m0, dst, NULL); 6656#ifdef __FreeBSD__ 6657 PF_LOCK(); 6658#endif 6659 } else { 6660 in6_ifstat_inc(ifp, ifs6_in_toobig); 6661#ifdef __FreeBSD__ 6662 if (r->rt != PF_DUPTO) { 6663 PF_UNLOCK(); 6664 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6665 PF_LOCK(); 6666 } else 6667#else 6668 if (r->rt != PF_DUPTO) 6669 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu); 6670 else 6671#endif 6672 goto bad; 6673 } 6674 6675done: 6676 if (r->rt != PF_DUPTO) 6677 *m = NULL; 6678 return; 6679 6680bad: 6681 m_freem(m0); 6682 goto done; 6683} 6684#endif /* INET6 */ 6685 6686 6687#ifdef __FreeBSD__ 6688/* 6689 * FreeBSD supports cksum offloads for the following drivers. 6690 * em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4), 6691 * ti(4), txp(4), xl(4) 6692 * 6693 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR : 6694 * network driver performed cksum including pseudo header, need to verify 6695 * csum_data 6696 * CSUM_DATA_VALID : 6697 * network driver performed cksum, needs to additional pseudo header 6698 * cksum computation with partial csum_data(i.e. lack of H/W support for 6699 * pseudo header, for instance hme(4), sk(4) and possibly gem(4)) 6700 * 6701 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and 6702 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper 6703 * TCP/UDP layer. 6704 * Also, set csum_data to 0xffff to force cksum validation. 6705 */ 6706int 6707pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af) 6708{ 6709 u_int16_t sum = 0; 6710 int hw_assist = 0; 6711 struct ip *ip; 6712 6713 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6714 return (1); 6715 if (m->m_pkthdr.len < off + len) 6716 return (1); 6717 6718 switch (p) { 6719 case IPPROTO_TCP: 6720 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6721 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6722 sum = m->m_pkthdr.csum_data; 6723 } else { 6724 ip = mtod(m, struct ip *); 6725 sum = in_pseudo(ip->ip_src.s_addr, 6726 ip->ip_dst.s_addr, htonl((u_short)len + 6727 m->m_pkthdr.csum_data + IPPROTO_TCP)); 6728 } 6729 sum ^= 0xffff; 6730 ++hw_assist; 6731 } 6732 break; 6733 case IPPROTO_UDP: 6734 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 6735 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { 6736 sum = m->m_pkthdr.csum_data; 6737 } else { 6738 ip = mtod(m, struct ip *); 6739 sum = in_pseudo(ip->ip_src.s_addr, 6740 ip->ip_dst.s_addr, htonl((u_short)len + 6741 m->m_pkthdr.csum_data + IPPROTO_UDP)); 6742 } 6743 sum ^= 0xffff; 6744 ++hw_assist; 6745 } 6746 break; 6747 case IPPROTO_ICMP: 6748#ifdef INET6 6749 case IPPROTO_ICMPV6: 6750#endif /* INET6 */ 6751 break; 6752 default: 6753 return (1); 6754 } 6755 6756 if (!hw_assist) { 6757 switch (af) { 6758 case AF_INET: 6759 if (p == IPPROTO_ICMP) { 6760 if (m->m_len < off) 6761 return (1); 6762 m->m_data += off; 6763 m->m_len -= off; 6764 sum = in_cksum(m, len); 6765 m->m_data -= off; 6766 m->m_len += off; 6767 } else { 6768 if (m->m_len < sizeof(struct ip)) 6769 return (1); 6770 sum = in4_cksum(m, p, off, len); 6771 } 6772 break; 6773#ifdef INET6 6774 case AF_INET6: 6775 if (m->m_len < sizeof(struct ip6_hdr)) 6776 return (1); 6777 sum = in6_cksum(m, p, off, len); 6778 break; 6779#endif /* INET6 */ 6780 default: 6781 return (1); 6782 } 6783 } 6784 if (sum) { 6785 switch (p) { 6786 case IPPROTO_TCP: 6787 { 6788 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 6789 break; 6790 } 6791 case IPPROTO_UDP: 6792 { 6793 KMOD_UDPSTAT_INC(udps_badsum); 6794 break; 6795 } 6796#ifdef INET 6797 case IPPROTO_ICMP: 6798 { 6799 KMOD_ICMPSTAT_INC(icps_checksum); 6800 break; 6801 } 6802#endif 6803#ifdef INET6 6804 case IPPROTO_ICMPV6: 6805 { 6806 KMOD_ICMP6STAT_INC(icp6s_checksum); 6807 break; 6808 } 6809#endif /* INET6 */ 6810 } 6811 return (1); 6812 } else { 6813 if (p == IPPROTO_TCP || p == IPPROTO_UDP) { 6814 m->m_pkthdr.csum_flags |= 6815 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 6816 m->m_pkthdr.csum_data = 0xffff; 6817 } 6818 } 6819 return (0); 6820} 6821#else /* !__FreeBSD__ */ 6822/* 6823 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag 6824 * off is the offset where the protocol header starts 6825 * len is the total length of protocol header plus payload 6826 * returns 0 when the checksum is valid, otherwise returns 1. 6827 */ 6828int 6829pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, 6830 sa_family_t af) 6831{ 6832 u_int16_t flag_ok, flag_bad; 6833 u_int16_t sum; 6834 6835 switch (p) { 6836 case IPPROTO_TCP: 6837 flag_ok = M_TCP_CSUM_IN_OK; 6838 flag_bad = M_TCP_CSUM_IN_BAD; 6839 break; 6840 case IPPROTO_UDP: 6841 flag_ok = M_UDP_CSUM_IN_OK; 6842 flag_bad = M_UDP_CSUM_IN_BAD; 6843 break; 6844 case IPPROTO_ICMP: 6845#ifdef INET6 6846 case IPPROTO_ICMPV6: 6847#endif /* INET6 */ 6848 flag_ok = flag_bad = 0; 6849 break; 6850 default: 6851 return (1); 6852 } 6853 if (m->m_pkthdr.csum_flags & flag_ok) 6854 return (0); 6855 if (m->m_pkthdr.csum_flags & flag_bad) 6856 return (1); 6857 if (off < sizeof(struct ip) || len < sizeof(struct udphdr)) 6858 return (1); 6859 if (m->m_pkthdr.len < off + len) 6860 return (1); 6861 switch (af) { 6862#ifdef INET 6863 case AF_INET: 6864 if (p == IPPROTO_ICMP) { 6865 if (m->m_len < off) 6866 return (1); 6867 m->m_data += off; 6868 m->m_len -= off; 6869 sum = in_cksum(m, len); 6870 m->m_data -= off; 6871 m->m_len += off; 6872 } else { 6873 if (m->m_len < sizeof(struct ip)) 6874 return (1); 6875 sum = in4_cksum(m, p, off, len); 6876 } 6877 break; 6878#endif /* INET */ 6879#ifdef INET6 6880 case AF_INET6: 6881 if (m->m_len < sizeof(struct ip6_hdr)) 6882 return (1); 6883 sum = in6_cksum(m, p, off, len); 6884 break; 6885#endif /* INET6 */ 6886 default: 6887 return (1); 6888 } 6889 if (sum) { 6890 m->m_pkthdr.csum_flags |= flag_bad; 6891 switch (p) { 6892 case IPPROTO_TCP: 6893 KMOD_TCPSTAT_INC(tcps_rcvbadsum); 6894 break; 6895 case IPPROTO_UDP: 6896 KMOD_UDPSTAT_INC(udps_badsum); 6897 break; 6898#ifdef INET 6899 case IPPROTO_ICMP: 6900 KMOD_ICMPSTAT_INC(icps_checksum); 6901 break; 6902#endif 6903#ifdef INET6 6904 case IPPROTO_ICMPV6: 6905 KMOD_ICMP6STAT_INC(icp6s_checksum); 6906 break; 6907#endif /* INET6 */ 6908 } 6909 return (1); 6910 } 6911 m->m_pkthdr.csum_flags |= flag_ok; 6912 return (0); 6913} 6914#endif /* __FreeBSD__ */ 6915 6916#ifdef INET 6917int 6918#ifdef __FreeBSD__ 6919pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6920 struct ether_header *eh, struct inpcb *inp) 6921#else 6922pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, 6923 struct ether_header *eh) 6924#endif 6925{ 6926 struct pfi_kif *kif; 6927 u_short action, reason = 0, log = 0; 6928 struct mbuf *m = *m0; 6929 struct ip *h = NULL; /* make the compiler happy */ 6930 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 6931 struct pf_state *s = NULL; 6932 struct pf_ruleset *ruleset = NULL; 6933 struct pf_pdesc pd; 6934 int off, dirndx, pqid = 0; 6935 6936#ifdef __FreeBSD__ 6937 PF_LOCK(); 6938#endif 6939 if (!pf_status.running) 6940#ifdef __FreeBSD__ 6941 { 6942 PF_UNLOCK(); 6943#endif 6944 return (PF_PASS); 6945#ifdef __FreeBSD__ 6946 } 6947#endif 6948 6949 memset(&pd, 0, sizeof(pd)); 6950 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 6951#ifdef __FreeBSD__ 6952 PF_UNLOCK(); 6953#endif 6954 DPFPRINTF(PF_DEBUG_URGENT, 6955 ("pf_test: pf_get_mtag returned NULL\n")); 6956 return (PF_DROP); 6957 } 6958#ifdef __FreeBSD__ 6959 if (m->m_flags & M_SKIP_FIREWALL) { 6960 PF_UNLOCK(); 6961 return (PF_PASS); 6962 } 6963#else 6964 if (pd.pf_mtag->flags & PF_TAG_GENERATED) 6965 return (PF_PASS); 6966#endif 6967 6968#ifdef __FreeBSD__ 6969 /* XXX_IMPORT: later */ 6970#else 6971 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 6972 ifp = ifp->if_carpdev; 6973#endif 6974 6975 kif = (struct pfi_kif *)ifp->if_pf_kif; 6976 if (kif == NULL) { 6977#ifdef __FreeBSD__ 6978 PF_UNLOCK(); 6979#endif 6980 DPFPRINTF(PF_DEBUG_URGENT, 6981 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname)); 6982 return (PF_DROP); 6983 } 6984 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 6985#ifdef __FreeBSD__ 6986 PF_UNLOCK(); 6987#endif 6988 return (PF_PASS); 6989 } 6990 6991#ifdef __FreeBSD__ 6992 M_ASSERTPKTHDR(m); 6993#else 6994#ifdef DIAGNOSTIC 6995 if ((m->m_flags & M_PKTHDR) == 0) 6996 panic("non-M_PKTHDR is passed to pf_test"); 6997#endif /* DIAGNOSTIC */ 6998#endif /* __FreeBSD__ */ 6999 7000 if (m->m_pkthdr.len < (int)sizeof(*h)) { 7001 action = PF_DROP; 7002 REASON_SET(&reason, PFRES_SHORT); 7003 log = 1; 7004 goto done; 7005 } 7006 7007 /* We do IP header normalization and packet reassembly here */ 7008 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) { 7009 action = PF_DROP; 7010 goto done; 7011 } 7012 m = *m0; 7013 h = mtod(m, struct ip *); 7014 7015 off = h->ip_hl << 2; 7016 if (off < (int)sizeof(*h)) { 7017 action = PF_DROP; 7018 REASON_SET(&reason, PFRES_SHORT); 7019 log = 1; 7020 goto done; 7021 } 7022 7023 pd.src = (struct pf_addr *)&h->ip_src; 7024 pd.dst = (struct pf_addr *)&h->ip_dst; 7025 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET); 7026 pd.ip_sum = &h->ip_sum; 7027 pd.proto = h->ip_p; 7028 pd.af = AF_INET; 7029 pd.tos = h->ip_tos; 7030 pd.tot_len = ntohs(h->ip_len); 7031 pd.eh = eh; 7032 7033 /* handle fragments that didn't get reassembled by normalization */ 7034 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) { 7035 action = pf_test_fragment(&r, dir, kif, m, h, 7036 &pd, &a, &ruleset); 7037 goto done; 7038 } 7039 7040 switch (h->ip_p) { 7041 7042 case IPPROTO_TCP: { 7043 struct tcphdr th; 7044 7045 pd.hdr.tcp = &th; 7046 if (!pf_pull_hdr(m, off, &th, sizeof(th), 7047 &action, &reason, AF_INET)) { 7048 log = action != PF_PASS; 7049 goto done; 7050 } 7051 if (dir == PF_IN && pf_check_proto_cksum(m, off, 7052 ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) { 7053 REASON_SET(&reason, PFRES_PROTCKSUM); 7054 action = PF_DROP; 7055 goto done; 7056 } 7057 pd.p_len = pd.tot_len - off - (th.th_off << 2); 7058 if ((th.th_flags & TH_ACK) && pd.p_len == 0) 7059 pqid = 1; 7060 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7061 if (action == PF_DROP) 7062 goto done; 7063 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7064 &reason); 7065 if (action == PF_PASS) { 7066#if NPFSYNC 7067 pfsync_update_state(s); 7068#endif /* NPFSYNC */ 7069 r = s->rule.ptr; 7070 a = s->anchor.ptr; 7071 log = s->log; 7072 } else if (s == NULL) 7073#ifdef __FreeBSD__ 7074 action = pf_test_tcp(&r, &s, dir, kif, 7075 m, off, h, &pd, &a, &ruleset, NULL, inp); 7076#else 7077 action = pf_test_tcp(&r, &s, dir, kif, 7078 m, off, h, &pd, &a, &ruleset, &ipintrq); 7079#endif 7080 break; 7081 } 7082 7083 case IPPROTO_UDP: { 7084 struct udphdr uh; 7085 7086 pd.hdr.udp = &uh; 7087 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7088 &action, &reason, AF_INET)) { 7089 log = action != PF_PASS; 7090 goto done; 7091 } 7092 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m, 7093 off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) { 7094 action = PF_DROP; 7095 REASON_SET(&reason, PFRES_PROTCKSUM); 7096 goto done; 7097 } 7098 if (uh.uh_dport == 0 || 7099 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7100 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7101 action = PF_DROP; 7102 REASON_SET(&reason, PFRES_SHORT); 7103 goto done; 7104 } 7105 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7106 if (action == PF_PASS) { 7107#if NPFSYNC 7108 pfsync_update_state(s); 7109#endif /* NPFSYNC */ 7110 r = s->rule.ptr; 7111 a = s->anchor.ptr; 7112 log = s->log; 7113 } else if (s == NULL) 7114#ifdef __FreeBSD__ 7115 action = pf_test_udp(&r, &s, dir, kif, 7116 m, off, h, &pd, &a, &ruleset, NULL, inp); 7117#else 7118 action = pf_test_udp(&r, &s, dir, kif, 7119 m, off, h, &pd, &a, &ruleset, &ipintrq); 7120#endif 7121 break; 7122 } 7123 7124 case IPPROTO_ICMP: { 7125 struct icmp ih; 7126 7127 pd.hdr.icmp = &ih; 7128 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN, 7129 &action, &reason, AF_INET)) { 7130 log = action != PF_PASS; 7131 goto done; 7132 } 7133 if (dir == PF_IN && pf_check_proto_cksum(m, off, 7134 ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) { 7135 action = PF_DROP; 7136 REASON_SET(&reason, PFRES_PROTCKSUM); 7137 goto done; 7138 } 7139 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd, 7140 &reason); 7141 if (action == PF_PASS) { 7142#if NPFSYNC 7143 pfsync_update_state(s); 7144#endif /* NPFSYNC */ 7145 r = s->rule.ptr; 7146 a = s->anchor.ptr; 7147 log = s->log; 7148 } else if (s == NULL) 7149#ifdef __FreeBSD__ 7150 action = pf_test_icmp(&r, &s, dir, kif, 7151 m, off, h, &pd, &a, &ruleset, NULL); 7152#else 7153 action = pf_test_icmp(&r, &s, dir, kif, 7154 m, off, h, &pd, &a, &ruleset, &ipintrq); 7155#endif 7156 break; 7157 } 7158 7159 default: 7160 action = pf_test_state_other(&s, dir, kif, &pd); 7161 if (action == PF_PASS) { 7162#if NPFSYNC 7163 pfsync_update_state(s); 7164#endif /* NPFSYNC */ 7165 r = s->rule.ptr; 7166 a = s->anchor.ptr; 7167 log = s->log; 7168 } else if (s == NULL) 7169#ifdef __FreeBSD__ 7170 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7171 &pd, &a, &ruleset, NULL); 7172#else 7173 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7174 &pd, &a, &ruleset, &ipintrq); 7175#endif 7176 break; 7177 } 7178 7179done: 7180 if (action == PF_PASS && h->ip_hl > 5 && 7181 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 7182 action = PF_DROP; 7183 REASON_SET(&reason, PFRES_IPOPTIONS); 7184 log = 1; 7185 DPFPRINTF(PF_DEBUG_MISC, 7186 ("pf: dropping packet with ip options\n")); 7187 } 7188 7189 if ((s && s->tag) || r->rtableid) 7190 pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 7191 7192#ifdef ALTQ 7193 if (action == PF_PASS && r->qid) { 7194 if (pqid || (pd.tos & IPTOS_LOWDELAY)) 7195 pd.pf_mtag->qid = r->pqid; 7196 else 7197 pd.pf_mtag->qid = r->qid; 7198 /* add hints for ecn */ 7199 pd.pf_mtag->af = AF_INET; 7200 pd.pf_mtag->hdr = h; 7201 } 7202#endif /* ALTQ */ 7203 7204 /* 7205 * connections redirected to loopback should not match sockets 7206 * bound specifically to loopback due to security implications, 7207 * see tcp_input() and in_pcblookup_listen(). 7208 */ 7209 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7210 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7211 (s->nat_rule.ptr->action == PF_RDR || 7212 s->nat_rule.ptr->action == PF_BINAT) && 7213 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) 7214 pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7215 7216 if (log) { 7217 struct pf_rule *lr; 7218 7219 if (s != NULL && s->nat_rule.ptr != NULL && 7220 s->nat_rule.ptr->log & PF_LOG_ALL) 7221 lr = s->nat_rule.ptr; 7222 else 7223 lr = r; 7224 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset, 7225 &pd); 7226 } 7227 7228 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7229 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++; 7230 7231 if (action == PF_PASS || r->action == PF_DROP) { 7232 dirndx = (dir == PF_OUT); 7233 r->packets[dirndx]++; 7234 r->bytes[dirndx] += pd.tot_len; 7235 if (a != NULL) { 7236 a->packets[dirndx]++; 7237 a->bytes[dirndx] += pd.tot_len; 7238 } 7239 if (s != NULL) { 7240 if (s->nat_rule.ptr != NULL) { 7241 s->nat_rule.ptr->packets[dirndx]++; 7242 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7243 } 7244 if (s->src_node != NULL) { 7245 s->src_node->packets[dirndx]++; 7246 s->src_node->bytes[dirndx] += pd.tot_len; 7247 } 7248 if (s->nat_src_node != NULL) { 7249 s->nat_src_node->packets[dirndx]++; 7250 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7251 } 7252 dirndx = (dir == s->direction) ? 0 : 1; 7253 s->packets[dirndx]++; 7254 s->bytes[dirndx] += pd.tot_len; 7255 } 7256 tr = r; 7257 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7258 if (nr != NULL) { 7259 struct pf_addr *x; 7260 /* 7261 * XXX: we need to make sure that the addresses 7262 * passed to pfr_update_stats() are the same than 7263 * the addresses used during matching (pfr_match) 7264 */ 7265 if (r == &pf_default_rule) { 7266 tr = nr; 7267 x = (s == NULL || s->direction == dir) ? 7268 &pd.baddr : &pd.naddr; 7269 } else 7270 x = (s == NULL || s->direction == dir) ? 7271 &pd.naddr : &pd.baddr; 7272 if (x == &pd.baddr || s == NULL) { 7273 /* we need to change the address */ 7274 if (dir == PF_OUT) 7275 pd.src = x; 7276 else 7277 pd.dst = x; 7278 } 7279 } 7280 if (tr->src.addr.type == PF_ADDR_TABLE) 7281 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7282 s->direction == dir) ? pd.src : pd.dst, pd.af, 7283 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7284 tr->src.neg); 7285 if (tr->dst.addr.type == PF_ADDR_TABLE) 7286 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7287 s->direction == dir) ? pd.dst : pd.src, pd.af, 7288 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7289 tr->dst.neg); 7290 } 7291 7292 7293 if (action == PF_SYNPROXY_DROP) { 7294 m_freem(*m0); 7295 *m0 = NULL; 7296 action = PF_PASS; 7297 } else if (r->rt) 7298 /* pf_route can free the mbuf causing *m0 to become NULL */ 7299 pf_route(m0, r, dir, ifp, s, &pd); 7300 7301#ifdef __FreeBSD__ 7302 PF_UNLOCK(); 7303#endif 7304 7305 return (action); 7306} 7307#endif /* INET */ 7308 7309#ifdef INET6 7310int 7311#ifdef __FreeBSD__ 7312pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7313 struct ether_header *eh, struct inpcb *inp) 7314#else 7315pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, 7316 struct ether_header *eh) 7317#endif 7318{ 7319 struct pfi_kif *kif; 7320 u_short action, reason = 0, log = 0; 7321 struct mbuf *m = *m0, *n = NULL; 7322 struct ip6_hdr *h; 7323 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr; 7324 struct pf_state *s = NULL; 7325 struct pf_ruleset *ruleset = NULL; 7326 struct pf_pdesc pd; 7327 int off, terminal = 0, dirndx, rh_cnt = 0; 7328 7329#ifdef __FreeBSD__ 7330 PF_LOCK(); 7331#endif 7332 7333 if (!pf_status.running) 7334#ifdef __FreeBSD__ 7335 { 7336 PF_UNLOCK(); 7337#endif 7338 return (PF_PASS); 7339#ifdef __FreeBSD__ 7340 } 7341#endif 7342 7343 memset(&pd, 0, sizeof(pd)); 7344 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) { 7345#ifdef __FreeBSD__ 7346 PF_UNLOCK(); 7347#endif 7348 DPFPRINTF(PF_DEBUG_URGENT, 7349 ("pf_test6: pf_get_mtag returned NULL\n")); 7350 return (PF_DROP); 7351 } 7352 if (pd.pf_mtag->flags & PF_TAG_GENERATED) 7353 return (PF_PASS); 7354 7355#ifdef __FreeBSD__ 7356 /* XXX_IMPORT: later */ 7357#else 7358 if (ifp->if_type == IFT_CARP && ifp->if_carpdev) 7359 ifp = ifp->if_carpdev; 7360#endif 7361 7362 kif = (struct pfi_kif *)ifp->if_pf_kif; 7363 if (kif == NULL) { 7364#ifdef __FreeBSD__ 7365 PF_UNLOCK(); 7366#endif 7367 DPFPRINTF(PF_DEBUG_URGENT, 7368 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname)); 7369 return (PF_DROP); 7370 } 7371 if (kif->pfik_flags & PFI_IFLAG_SKIP) { 7372#ifdef __FreeBSD__ 7373 PF_UNLOCK(); 7374#endif 7375 return (PF_PASS); 7376 } 7377 7378#ifdef __FreeBSD__ 7379 M_ASSERTPKTHDR(m); 7380#else 7381#ifdef DIAGNOSTIC 7382 if ((m->m_flags & M_PKTHDR) == 0) 7383 panic("non-M_PKTHDR is passed to pf_test6"); 7384#endif /* DIAGNOSTIC */ 7385#endif 7386 7387#ifdef __FreeBSD__ 7388 h = NULL; /* make the compiler happy */ 7389#endif 7390 7391 if (m->m_pkthdr.len < (int)sizeof(*h)) { 7392 action = PF_DROP; 7393 REASON_SET(&reason, PFRES_SHORT); 7394 log = 1; 7395 goto done; 7396 } 7397 7398 /* We do IP header normalization and packet reassembly here */ 7399 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) { 7400 action = PF_DROP; 7401 goto done; 7402 } 7403 m = *m0; 7404 h = mtod(m, struct ip6_hdr *); 7405 7406#if 1 7407 /* 7408 * we do not support jumbogram yet. if we keep going, zero ip6_plen 7409 * will do something bad, so drop the packet for now. 7410 */ 7411 if (htons(h->ip6_plen) == 0) { 7412 action = PF_DROP; 7413 REASON_SET(&reason, PFRES_NORM); /*XXX*/ 7414 goto done; 7415 } 7416#endif 7417 7418 pd.src = (struct pf_addr *)&h->ip6_src; 7419 pd.dst = (struct pf_addr *)&h->ip6_dst; 7420 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6); 7421 pd.ip_sum = NULL; 7422 pd.af = AF_INET6; 7423 pd.tos = 0; 7424 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr); 7425 pd.eh = eh; 7426 7427 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr); 7428 pd.proto = h->ip6_nxt; 7429 do { 7430 switch (pd.proto) { 7431 case IPPROTO_FRAGMENT: 7432 action = pf_test_fragment(&r, dir, kif, m, h, 7433 &pd, &a, &ruleset); 7434 if (action == PF_DROP) 7435 REASON_SET(&reason, PFRES_FRAG); 7436 goto done; 7437 case IPPROTO_ROUTING: { 7438 struct ip6_rthdr rthdr; 7439 7440 if (rh_cnt++) { 7441 DPFPRINTF(PF_DEBUG_MISC, 7442 ("pf: IPv6 more than one rthdr\n")); 7443 action = PF_DROP; 7444 REASON_SET(&reason, PFRES_IPOPTIONS); 7445 log = 1; 7446 goto done; 7447 } 7448 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL, 7449 &reason, pd.af)) { 7450 DPFPRINTF(PF_DEBUG_MISC, 7451 ("pf: IPv6 short rthdr\n")); 7452 action = PF_DROP; 7453 REASON_SET(&reason, PFRES_SHORT); 7454 log = 1; 7455 goto done; 7456 } 7457 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) { 7458 DPFPRINTF(PF_DEBUG_MISC, 7459 ("pf: IPv6 rthdr0\n")); 7460 action = PF_DROP; 7461 REASON_SET(&reason, PFRES_IPOPTIONS); 7462 log = 1; 7463 goto done; 7464 } 7465 /* fallthrough */ 7466 } 7467 case IPPROTO_AH: 7468 case IPPROTO_HOPOPTS: 7469 case IPPROTO_DSTOPTS: { 7470 /* get next header and header length */ 7471 struct ip6_ext opt6; 7472 7473 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6), 7474 NULL, &reason, pd.af)) { 7475 DPFPRINTF(PF_DEBUG_MISC, 7476 ("pf: IPv6 short opt\n")); 7477 action = PF_DROP; 7478 log = 1; 7479 goto done; 7480 } 7481 if (pd.proto == IPPROTO_AH) 7482 off += (opt6.ip6e_len + 2) * 4; 7483 else 7484 off += (opt6.ip6e_len + 1) * 8; 7485 pd.proto = opt6.ip6e_nxt; 7486 /* goto the next header */ 7487 break; 7488 } 7489 default: 7490 terminal++; 7491 break; 7492 } 7493 } while (!terminal); 7494 7495 /* if there's no routing header, use unmodified mbuf for checksumming */ 7496 if (!n) 7497 n = m; 7498 7499 switch (pd.proto) { 7500 7501 case IPPROTO_TCP: { 7502 struct tcphdr th; 7503 7504 pd.hdr.tcp = &th; 7505 if (!pf_pull_hdr(m, off, &th, sizeof(th), 7506 &action, &reason, AF_INET6)) { 7507 log = action != PF_PASS; 7508 goto done; 7509 } 7510 if (dir == PF_IN && pf_check_proto_cksum(n, off, 7511 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7512 IPPROTO_TCP, AF_INET6)) { 7513 action = PF_DROP; 7514 REASON_SET(&reason, PFRES_PROTCKSUM); 7515 goto done; 7516 } 7517 pd.p_len = pd.tot_len - off - (th.th_off << 2); 7518 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd); 7519 if (action == PF_DROP) 7520 goto done; 7521 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd, 7522 &reason); 7523 if (action == PF_PASS) { 7524#if NPFSYNC 7525 pfsync_update_state(s); 7526#endif /* NPFSYNC */ 7527 r = s->rule.ptr; 7528 a = s->anchor.ptr; 7529 log = s->log; 7530 } else if (s == NULL) 7531#ifdef __FreeBSD__ 7532 action = pf_test_tcp(&r, &s, dir, kif, 7533 m, off, h, &pd, &a, &ruleset, NULL, inp); 7534#else 7535 action = pf_test_tcp(&r, &s, dir, kif, 7536 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7537#endif 7538 break; 7539 } 7540 7541 case IPPROTO_UDP: { 7542 struct udphdr uh; 7543 7544 pd.hdr.udp = &uh; 7545 if (!pf_pull_hdr(m, off, &uh, sizeof(uh), 7546 &action, &reason, AF_INET6)) { 7547 log = action != PF_PASS; 7548 goto done; 7549 } 7550 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(n, 7551 off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7552 IPPROTO_UDP, AF_INET6)) { 7553 action = PF_DROP; 7554 REASON_SET(&reason, PFRES_PROTCKSUM); 7555 goto done; 7556 } 7557 if (uh.uh_dport == 0 || 7558 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off || 7559 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) { 7560 action = PF_DROP; 7561 REASON_SET(&reason, PFRES_SHORT); 7562 goto done; 7563 } 7564 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd); 7565 if (action == PF_PASS) { 7566#if NPFSYNC 7567 pfsync_update_state(s); 7568#endif /* NPFSYNC */ 7569 r = s->rule.ptr; 7570 a = s->anchor.ptr; 7571 log = s->log; 7572 } else if (s == NULL) 7573#ifdef __FreeBSD__ 7574 action = pf_test_udp(&r, &s, dir, kif, 7575 m, off, h, &pd, &a, &ruleset, NULL, inp); 7576#else 7577 action = pf_test_udp(&r, &s, dir, kif, 7578 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7579#endif 7580 break; 7581 } 7582 7583 case IPPROTO_ICMPV6: { 7584 struct icmp6_hdr ih; 7585 7586 pd.hdr.icmp6 = &ih; 7587 if (!pf_pull_hdr(m, off, &ih, sizeof(ih), 7588 &action, &reason, AF_INET6)) { 7589 log = action != PF_PASS; 7590 goto done; 7591 } 7592 if (dir == PF_IN && pf_check_proto_cksum(n, off, 7593 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)), 7594 IPPROTO_ICMPV6, AF_INET6)) { 7595 action = PF_DROP; 7596 REASON_SET(&reason, PFRES_PROTCKSUM); 7597 goto done; 7598 } 7599 action = pf_test_state_icmp(&s, dir, kif, 7600 m, off, h, &pd, &reason); 7601 if (action == PF_PASS) { 7602#if NPFSYNC 7603 pfsync_update_state(s); 7604#endif /* NPFSYNC */ 7605 r = s->rule.ptr; 7606 a = s->anchor.ptr; 7607 log = s->log; 7608 } else if (s == NULL) 7609#ifdef __FreeBSD__ 7610 action = pf_test_icmp(&r, &s, dir, kif, 7611 m, off, h, &pd, &a, &ruleset, NULL); 7612#else 7613 action = pf_test_icmp(&r, &s, dir, kif, 7614 m, off, h, &pd, &a, &ruleset, &ip6intrq); 7615#endif 7616 break; 7617 } 7618 7619 default: 7620 action = pf_test_state_other(&s, dir, kif, &pd); 7621 if (action == PF_PASS) { 7622#if NPFSYNC 7623 pfsync_update_state(s); 7624#endif /* NPFSYNC */ 7625 r = s->rule.ptr; 7626 a = s->anchor.ptr; 7627 log = s->log; 7628 } else if (s == NULL) 7629#ifdef __FreeBSD__ 7630 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7631 &pd, &a, &ruleset, NULL); 7632#else 7633 action = pf_test_other(&r, &s, dir, kif, m, off, h, 7634 &pd, &a, &ruleset, &ip6intrq); 7635#endif 7636 break; 7637 } 7638 7639done: 7640 /* handle dangerous IPv6 extension headers. */ 7641 if (action == PF_PASS && rh_cnt && 7642 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) { 7643 action = PF_DROP; 7644 REASON_SET(&reason, PFRES_IPOPTIONS); 7645 log = 1; 7646 DPFPRINTF(PF_DEBUG_MISC, 7647 ("pf: dropping packet with dangerous v6 headers\n")); 7648 } 7649 7650 if ((s && s->tag) || r->rtableid) 7651 pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid); 7652 7653#ifdef ALTQ 7654 if (action == PF_PASS && r->qid) { 7655 if (pd.tos & IPTOS_LOWDELAY) 7656 pd.pf_mtag->qid = r->pqid; 7657 else 7658 pd.pf_mtag->qid = r->qid; 7659 /* add hints for ecn */ 7660 pd.pf_mtag->af = AF_INET6; 7661 pd.pf_mtag->hdr = h; 7662 } 7663#endif /* ALTQ */ 7664 7665 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP || 7666 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL && 7667 (s->nat_rule.ptr->action == PF_RDR || 7668 s->nat_rule.ptr->action == PF_BINAT) && 7669 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) 7670 pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST; 7671 7672 if (log) { 7673 struct pf_rule *lr; 7674 7675 if (s != NULL && s->nat_rule.ptr != NULL && 7676 s->nat_rule.ptr->log & PF_LOG_ALL) 7677 lr = s->nat_rule.ptr; 7678 else 7679 lr = r; 7680 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset, 7681 &pd); 7682 } 7683 7684 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len; 7685 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++; 7686 7687 if (action == PF_PASS || r->action == PF_DROP) { 7688 dirndx = (dir == PF_OUT); 7689 r->packets[dirndx]++; 7690 r->bytes[dirndx] += pd.tot_len; 7691 if (a != NULL) { 7692 a->packets[dirndx]++; 7693 a->bytes[dirndx] += pd.tot_len; 7694 } 7695 if (s != NULL) { 7696 if (s->nat_rule.ptr != NULL) { 7697 s->nat_rule.ptr->packets[dirndx]++; 7698 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len; 7699 } 7700 if (s->src_node != NULL) { 7701 s->src_node->packets[dirndx]++; 7702 s->src_node->bytes[dirndx] += pd.tot_len; 7703 } 7704 if (s->nat_src_node != NULL) { 7705 s->nat_src_node->packets[dirndx]++; 7706 s->nat_src_node->bytes[dirndx] += pd.tot_len; 7707 } 7708 dirndx = (dir == s->direction) ? 0 : 1; 7709 s->packets[dirndx]++; 7710 s->bytes[dirndx] += pd.tot_len; 7711 } 7712 tr = r; 7713 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule; 7714 if (nr != NULL) { 7715 struct pf_addr *x; 7716 /* 7717 * XXX: we need to make sure that the addresses 7718 * passed to pfr_update_stats() are the same than 7719 * the addresses used during matching (pfr_match) 7720 */ 7721 if (r == &pf_default_rule) { 7722 tr = nr; 7723 x = (s == NULL || s->direction == dir) ? 7724 &pd.baddr : &pd.naddr; 7725 } else { 7726 x = (s == NULL || s->direction == dir) ? 7727 &pd.naddr : &pd.baddr; 7728 } 7729 if (x == &pd.baddr || s == NULL) { 7730 if (dir == PF_OUT) 7731 pd.src = x; 7732 else 7733 pd.dst = x; 7734 } 7735 } 7736 if (tr->src.addr.type == PF_ADDR_TABLE) 7737 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL || 7738 s->direction == dir) ? pd.src : pd.dst, pd.af, 7739 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7740 tr->src.neg); 7741 if (tr->dst.addr.type == PF_ADDR_TABLE) 7742 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL || 7743 s->direction == dir) ? pd.dst : pd.src, pd.af, 7744 pd.tot_len, dir == PF_OUT, r->action == PF_PASS, 7745 tr->dst.neg); 7746 } 7747 7748 7749 if (action == PF_SYNPROXY_DROP) { 7750 m_freem(*m0); 7751 *m0 = NULL; 7752 action = PF_PASS; 7753 } else if (r->rt) 7754 /* pf_route6 can free the mbuf causing *m0 to become NULL */ 7755 pf_route6(m0, r, dir, ifp, s, &pd); 7756 7757#ifdef __FreeBSD__ 7758 PF_UNLOCK(); 7759#endif 7760 return (action); 7761} 7762#endif /* INET6 */ 7763 7764int 7765pf_check_congestion(struct ifqueue *ifq) 7766{ 7767#ifdef __FreeBSD__ 7768 /* XXX_IMPORT: later */ 7769 return (0); 7770#else 7771 if (ifq->ifq_congestion) 7772 return (1); 7773 else 7774 return (0); 7775#endif 7776} 7777